Original title: The strongest rotary drilling arrangement in history, if you don't know, the construction will be in vain! This article has sorted out the characteristics and scope of application of all rotary drilling tools. You can select and use these drilling tools according to their characteristics during construction. It is strongly recommended for collection! Category I: rotary drilling bucket A: Rock-socketed sand hopper Features: The main body type is the same as the sand layer drilling bucket, but the cutting tools are different. The cutting teeth can be all adopted, and the combined teeth can also be adopted. Applicable strata: soft and hard strata and complex strata such as sandy soil layer with high water content, muddy clay, dense clay, sandy gravel layer, pebble gravel layer, shell layer, iron plate sand, high strength frozen soil, strongly ~ moderately weathered rock stratum, etc. B: bailing bucket Expand the full text Double bottom bailing bit Features: There are two bottom plates under the barrel, the upper and lower bottom plates are connected by the central suspension shaft, and they can rotate a certain angle relatively to realize the opening and closing of the soil inlet at the bottom of the bucket. For the stratum which is easy to suck and drill, the straight-through gas bit can be specially designed. Applicable strata: loose soil,Tapered Rock Bit, sandy soil layer with high water content, muddy loam, gravel layer, loose frozen soil and other strata with loose structure and low extraction strength. φ2000 sand hopper (upper form) φ2000 Bao'e tooth sand hopper (middle and lower shape) Double-bottom sand hopper for hole cleaning Application of hole cleaning sand hopper: it is used to remove the sediment in the hole. C: Soil drilling bucket Rotary soil layer drilling bucket Features: single floor, supporting the use of wear-resistant alloy steel shovel type bucket teeth, to achieve rapid drilling. Applicable strata: silt,fastest dth hammer, muddy clay, clay, plastic frozen soil, massive sandy soil, weathered soft bedrock and other strata with low strength and difficult to loosen structure after being disturbed. Type II: rotary drilling short auger bit A: Rock-socketed screw Monocone monospiral rock helix Double-flat-head single-screw rock-socketed bit Biconical monospiral rock helix Bipyramidal bispiral rock spiral φ 2500 bipyramidal bispiral rock helix Double flat-headed rock spiral Features: Helical blade can be conical head or flat head, cutting tool is bullet-shaped pick, tooth arrangement and helical blade. There are many types according to different strata. Applicable strata: hard soil layer, sandy gravel layer, strongly ~ weakly weathered rock stratum, hard frozen soil with developed joints, etc. B: Soil layer spiral Single-head single-screw soil lay screw drill bit Double-head double-screw soil layer screw bit Features: The spiral blade starts with flat head, and the spiral form can be divided into single-head single-screw, DHD Drill bit ,dth hammer bit, double-head single-screw and double-head double-screw, on which wear-resistant alloy steel shovel-type bucket teeth are welded. Applicable stratum: the stratum of clay, sandy soil, plastic frozen soil, etc. above the aquifer, the structure of which is not easy to be loosened and the strength of which is low after being disturbed. Type III: Rotary rock barrel drill Rock barrel drill Claw spring rock barrel drill Rock drill Rock drilling and soil extraction effect Features: The rock taking barrel is a ring-shaped barrel without bottom plate, and the cutting tool is a bullet-shaped pick welded at the lower edge of the barrel. It can be divided into rock barrel drill, rock drilling drill and claw-spring rock barrel drill. Applicable stratum: relatively hard bedrock stratum, large boulder layer and hard permafrost layer. Category IV: Special hard rock bit Rock barrel drill with centralizer Pick sand hopper with centralizer Description: Special drill bit specially designed for hard rock formation. The fifth category: body drilling bit Rotary excavation body drill bit opening status Type VI: bulldozer disc bit Pot bottom dozer bit Manually operated cone bottom dozer bit Features: There is a bulldozing plate inside the drill bit cylinder. Pressure is applied to the bulldozing mechanism above the drill bit through the pressure plate of the drilling rig. The bulldozing plate moves downward and the unloading is smooth. The bulldozing mechanism of the drill bit is divided into manual and automatic. Applicable strata: silty clay layer and other strata difficult to unload Type VII: rotary drilling under-reamed bit The under-reamed bit is mainly mechanical, which is relatively simple to use and maintain. There are up-opening and down-opening bits, and the opening mechanism is generally four-link, which is used for soil, strong wind, moderately weathered strata and even hard bedrock. Because the rotary drilling is a non-circulation drilling, the slag can be removed with a slag removal bucket after the bottom is expanded. Underreamer bit Bottom reaming state of underreaming bit Class VIII: SMW drilling tools The SMW method is used for the construction of underground continuous wall. It has the characteristics of spiral wing and mixing wing arranged alternately. With the repeated drilling and mixing, the cement slurry and soil can be fully and evenly mixed. The multi-axis drilling method is adopted. The drill pipe is a hollow pipe, and the front end of the drill bit has a discharge outlet for pressure injection of cement slurry. Its application scope and characteristics are as follows: SMW diaphragm wall can be used not only as a reliable water retaining wall, but also as a retaining wall and a supporting wall for resisting soil pressure. It adopts multi-axis drilling, with high construction efficiency, high precision of groove formation, and the reinforcement depth can reach 30-40 meters. Groove thickness up to 400-800 mm. And due to the unique stirring mechanism and the complete lapping construction method of the mutual reverse rotation among the stirring blades, And that mix is more uniform, and the strength and the anti-seepage capability of the wall are stronger. Category IX: CFG Long Auger Long auger drilling tool: The drilling tool is in the form of continuous long auger. The drill has the function of pouring concrete into the central pipe, and its top is equipped with an air release valve. The bottom of the central pipe is provided with a concrete outlet, and the outlet is provided with two valves which can be opened and closed. Before the drilling tool begins to drill the soil, the valve shall be closed to prevent soil, sand or water from entering the central pipe, and the valve shall be opened when the pump delivers concrete. Long spiral drilling tools can be divided into internal drive and external groove block drive long spiral drilling tools. Category X: Other supporting tools There are many tools related to rotary drilling, and the following is a brief introduction to the more commonly used tools: Stirring cylinder Full casing Full casing shoe Square head reducer Drill pipe extension Category 11: Cutting tools for rotary drilling A: Bucket teeth Applicable strata for bucket teeth: silt, clay, sand layer, loose soil, plastic frozen soil and loose frozen soil, a small part of gravel layer and other strata with low strength and loose structure. V19 and V20 rotary bucket teeth T25 straight teeth Type E1500 Shovel B: Pick Strata with high strength shall be used for hard soil layer, sand gravel layer, hard frozen soil, medium hard ~ hard rock stratum, weakly ~ moderately weathered rock stratum,mining drill bit, etc. U84 long pick Type BKH22 stub pick C: ZHC combination tooth Features: It is a combination of relieving teeth and cutting teeth, which are welded together. Applicable stratum: applicable to all kinds of strata, especially for the strong weathered layer with slightly loose structure and the sand and gravel layer. END Source: Foundation Engineering Return to Sohu to see more Responsible Editor:. wt-dthtools.com

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Original Title: Devouring Countless Children Every Year, don't Parents Pay Attention to These Fatal Hidden Dangers? Every parent has a safety responsibility letter about their children in their hearts. Although no one assesses them, they will strive to achieve 100% of the target. Recently, there is a piece of news that makes people heartache. At the time of the accident, two children were playing in the water, which was initially judged to be caused by electric shock. The two lively and lovely children were gone, and the two families were incomplete. Children's parents, how can not accept, they are still alive and kicking in the morning, how can not wake up in the afternoon. Distressing accident, should not have happened, could have been avoided. However, the tragedy happened. When parents take their children out for a walk, they must be careful of these dangerous sources in the community. Expand the full text 01 In fact, it is not the first time that landscape lights have caused electric shocks, and there are many similar accidents. Every child is an angel, and every parent wants to give the best to their children. At home, every parent will try to avoid their children being burned, touched, knocked,Borehole Drill Bits, injured and electrified by electrical appliances, but after going out, they often neglect some potential safety hazards, especially those electrified public facilities. Many parents do not realize that the landscape lights in the community square, roadside and green belt may leak electricity, so they neglect to take precautions, and the young children will not know. Thus, the tragedy is repeated. Whenever you take your child out for a walk,dhd drill bit, be especially careful of landscape lights and places where electricity may leak. Because children are safe and healthy, parents can feel at ease and families can be happy. 02 Air conditioning units: We can see air conditioning units everywhere, can be said to be a hidden killer. First of all, the shell and outer cover of the air conditioner are made of metal, which will have a high temperature in high temperature weather, and accidental touch will easily scald. Secondly, it may leak electricity when it works. Some air conditioners are installed in low places. If playful children climb up, the consequences will be serious. Street lamp: Young children are always curious about everything and like to run around and touch. If the street lamp is aged and short-circuited when it is electrified, parents will easily get an electric shock if their children touch it. Substations: Substations can be seen everywhere in residential areas and streets. They are box-type and landscape-type. They look like public toilets on the roadside. Once children enter by mistake, they are prone to accidents. Touch power is everywhere, but not because of touch power will not go out, the most important thing is to prevent, through prevention to achieve safety. The most important responsibility for prevention lies with parents, who should take their children away from touching the power supply, dth button bits ,mining dth bit, and inform their sensible children of the danger of touching the power supply. After all, no parent who loves his child would like his child to be hurt by electric shock. 03 In addition to touch power, there are other hazards in the community, such as elevators, parking lots, under tall buildings and so on. I. Elevator There have been countless elevator accidents. On the one hand, be careful to pinch hands. On the other hand, when getting in and out of the elevator, it is necessary to confirm that the elevator and the floor are on the same plane before getting in and out of the elevator, otherwise young children may be caught or caught in the gap. Many children feel that the buttons of the elevator are particularly funny, like to press the buttons randomly, if pressed randomly, it is easy to cause danger due to improper operation, so parents must pay special attention. 2. Parking lot Hide and seek is a game often played by children. Although there are often clips of adults playing "hide and seek" in the parking lot in movies and TV dramas. But for children, playing hide-and-seek in the parking lot is really too dangerous. First of all, there will be car exhaust in the parking lot, and adults who are carsick will feel uncomfortable if they accidentally inhale it, let alone children. Secondly, if the child is too young to hide in a corner of the parking lot, it is not easy to be found, cars come and go in the parking lot, it is easy to cause danger. Therefore, parents should prohibit young children from playing hide-and-seek in the parking lot. Three, under the tall building. Some children like to walk on the edge or against the wall under tall buildings. If there are falling objects or throwing objects from high altitude, they will be easily injured. If a weak child is hit, the consequences will be unimaginable. Recently, there was a piece of news that on the day when Beijing was hit by a force 8 gale, the delivery boy of Meituan was hit by a tree and died. Therefore, do not go out in windy weather, let alone take children out. 04 There is a line in "One Servant and Two Masters" that safety comes first, and everything else is empty. Indeed, safety is always the most important thing, and the safety of every child is the greatest wish of parents. Not only enterprises should keep the safety alarm bell ringing, but also parents should keep the safety alarm bell ringing. No matter how well parents buy school district houses and plan for their children, when accidents happen, some things lose their meaning. Good parents can not only identify the dangerous sources in their homes, but also identify the dangerous sources outside their homes, and ultimately prevent safety risks and ensure the safety of their children. Young children are often unable to judge what is dangerous and what is safe. Parents should not only help their children judge, but also teach them to judge. In the hearts of parents, ensuring the safety of their children is a more important responsibility than Mount Tai. There is a line in the movie Interstellar that as a father, there must be a responsibility to bear in mind, that is, to ensure the safety of children no matter what. Every parent has a safety responsibility letter about their children in their hearts. Although no one assesses them, they will strive to achieve 100% of the target. Summer is coming, and children's summer vacation is coming, which is also an important period for parents to guard against safety risks and ensure their children's safety. How gratifying it is to be able to take the child out happily and bring him home safely. Return to Sohu to see more Responsible Editor: (function() { function getBrandHtml() { var brands = [],overburden drilling systems, html = ''; for(var i = 0; i < brands.length; i++) { var brand = brands[i]; if(brands.length i+1) { html+= ''+brand.name+''; } else { html+= ''+brand.name+'、'; } } return html; }; if(document.getElementById('linkBtn')){ document.getElementById('linkBtn').onclick = function() { $('#brands').removeClass('brand');$ ( '# tipInfo').text ( 'Real name responded'); $ ('#linkBtn').remove();$ ('.real-response .content').css('line-height', '20px');$ ('.real-response .time').css('line-height', '20px'); }; document.getElementById('brands').innerHTML = getBrandHtml(); }; })();。 wt-dthtools.com

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Original Title: 6 Processes of Open-pit Mining from Perforation, Blasting to Dumping The mining technology of open-pit mine is relatively simple, mainly including drilling, blasting, mining, loading and transportation, and rock dumping. Next, we will talk about the mining technology of open-pit mines in detail. I. Perforation work Perforation is the first working procedure of open pit mining. In the whole process of open pit mining, the cost of perforation accounts for about 10%-15% of the total production cost. 1. Down-the-hole drill The down-the-hole drilling machine has the advantages of large drilling angle change range, high mechanization degree, reduction of auxiliary operation time, improvement of the operation rate of the drilling machine, flexibility of the down-the-hole drilling machine, light equipment weight and low investment cost, and particularly can control the ore grade by drilling various inclined holes, eliminate toes, reduce large blocks and improve the blasting quality. Therefore, the down-the-hole drill is widely used in small and medium-sized mines at home and abroad, which is suitable for medium hard rock drilling. 2. Rotary drill Rotary drilling rig is a new type of drilling equipment developed on the basis of rotary drilling rig, which has the characteristics of high drilling efficiency, low operation cost, high degree of mechanization and automation, and is suitable for drilling operations of various hardness of ore and rock. At present,dth drill bits, it has become a common drilling equipment used in open-pit mines all over the world. 3. Rock drilling jumbo Drill jumbo is a new type of drilling equipment with the development of mining industry. One or a plurality of rock drills are arranged on a special drill boom or a rack together with an automatic propeller, and a traveling mechanism is arranged, so that the operation of the rock drill is mechanized. II. Blasting work The purpose of blasting work is to break the hard solid ore rock and provide the excavation material with appropriate size for mining and loading work. In the total cost of open-pit mining, blasting cost accounts for about 15% -20%. The quality of blasting not only directly affects the efficiency of mining, transportation, coarse crushing and other equipment, but also affects the total cost of the mine. 1. Shallow hole blasting Expand the full text The diameter of the hole used in shallow hole blasting is small, generally about 30-75 mm, and the depth of the hole is generally less than 5 meters,dth rock bit, sometimes up to about 8 meters. If the drilling jumbo is used for drilling, the depth of the hole can be increased. Shallow-hole blasting is mainly used for the excavation of open-pit mines or quarries, caverns and tunnels with small production scale, secondary blasting, the treatment of new open-pit mine hills, the formation of hillside open-pit single-wall ditch transportation channels and other special blasting. 2. Deep-hole blasting Deep-hole blasting is a blasting method that uses drilling equipment to drill deeper boreholes as the charging space of mining explosives. The deep-hole blasting of open-pit mine is mainly the production blasting of bench. Drilling equipment for deep-hole blasting mainly includes down-the-hole drill and roller drill. It can be used to drill vertical deep holes or inclined blast holes. The charging of inclined blast holes is more uniform, and the blasting quality of ore and rock is better, which creates good conditions for mining and loading work. In order to reduce the seismic effect and improve the blasting quality, such measures as millisecond blasting in large area, interval charging in blastholes or bottom air interval charging can be taken under certain conditions, so as to reduce the blasting cost and obtain better economic benefit. 3. Chamber blasting Chamber blasting is a blasting method in which more or a large amount of explosives are loaded in the tunnel of the blasting chamber. Open-pit mines are used only during the capital construction period and under specific conditions, and quarries are used when conditions permit and when the demand for mining is high. 4. Multi-row hole millisecond blasting method In recent years, with the rapid increase of the excavator bucket capacity and the production capacity of the open-pit mine, the normal excavation blasting of the open-pit mine requires more and more blasting quantity each time. Therefore, large-scale blasting methods such as multi-row-hole millisecond blasting and multi-row-hole millisecond extrusion blasting are widely used in open-pit mining at home and abroad. Advantages of multi-row millisecond blasting: The one-time blasting quantity is large, the blasting times and the blasting avoidance time are reduced, Mining Drilling Equipment ,rock drilling tools, and the utilization rate of the stope equipment is improved; The broken quality of ore and rock is improved, and the boulder rate is reduced by 40 to 50% compared with that of single-row hole blasting; The efficiency of perforating equipment is increased by about 10% -15%, which is due to the increase of working time utilization coefficient and the decrease of the number of operations of perforating equipment and filling area after blasting; Improve the efficiency of mining and transportation equipment by about 10% -15%. 5. Multi-row hole differential extrusion blasting method It refers to the multi-row millisecond blasting in the case of residual muckpile in the working face. The existence of muck pile creates conditions for extrusion. On the one hand, it can prolong the effective action time of blasting and improve the utilization of explosive energy and crushing effect; on the other hand, it can control the width of muck pile and avoid the scattering of ore and rock. The millisecond interval of multi-row hole millisecond extrusion blasting should be 30% ~ 50% longer than that of ordinary millisecond blasting, and 50 ~ 100ms is often used in open-pit mines in China. The advantages of multi-row hole millisecond extrusion blasting are as follows: (1) The ore rock crushing effect is better. This is mainly because the front is blocked by the slag heap, and each row of boreholes, including the first row, can increase the charge and be fully crushed under the extrusion of the slag heap; (2) The muckpile is more concentrated. For the mine using railway transportation, it is not necessary to dismantle the road before blasting, so as to improve the efficiency of mining, loading and transportation equipment. The disadvantages of multi-row hole millisecond extrusion blasting are as follows: (1) High explosive consumption; (2) The working platform is required to be wider to accommodate the ballast pile; (3) The blasting pile height is large, which may affect the safety of excavator operation. III. Blasting measures near the slope With the downward extension of the open-pit mine, the problem of slope stability has become increasingly prominent. In order to protect the slope, the blasting near the slope should be strictly controlled. According to the experience at home and abroad, the main measures are millisecond blasting, presplitting blasting and smooth blasting. 1. Adopt millisecond blasting to reduce vibration One of the main functions of millisecond blasting is to reduce the seismic effect of blasting. In order to give full play to the shock absorption effect of millisecond blasting, the key is to try to increase the number of blasting segments and control the millisecond interval. 2. Adopt presplitting blasting to isolate the slope. The presplitting blasting near the slope is to drill a row of dense parallel boreholes along the slope boundary, fill each hole with a small amount of explosives, and detonate before the excavation zone is blasted, so as to obtain a crack with a certain width and running through each borehole. Due to the separation of the excavation zone from the slope by the pre-fracture, the seismic wave of the subsequent excavation blasting will produce a strong reflection on the fracture surface, which will greatly reduce the seismic wave passing through it, thus protecting the slope. 3. Adopt smooth blasting to protect the slope. Smooth blasting near the slope is to drill a row of dense parallel boreholes along the boundary line, fill a small amount of explosives in the holes, and then blast after the excavation of boreholes, so as to form parallel rock walls along the dense boreholes. The difference between smooth blasting and presplitting blasting lies mainly in the initiation time. The initiation of smooth holes is later than the previous rows of excavation holes, usually 50 to 75 ms later. In addition, another measure is to control the blasting of the last few rows of boreholes. The explosive quantity and resistance line of the last rows of boreholes near the slope should be reduced, which is called "buffer blasting", which can reduce the damage of drilling blasting to the slope. IV. Purchase, loading and transportation Acquisition and loading: Mining and loading operation is to use loading machinery to excavate ore rock directly from the ground or blasting pile, and load it into the carriage of transport machinery or unload it directly to the designated place. It is the central link in the process of open-pit mining, and other production processes such as drilling and blasting, transportation and so on serve for mining and loading. Main mining and loading equipment: excavator, dragline, hydraulic shovel and rubber-tyred front loader. Transportation In the process of open-pit mining, the capital construction investment of mine transportation accounts for about 60% of the total investment of mine capital construction, and the transportation cost and labor volume account for more than half of the total ore cost and labor volume respectively, which shows the important position of transportation in open-pit mining. Transportation modes of open-pit mine: automobile transportation, railway transportation, belt transportation, slope skip lifting transportation and combined transportation, among which dump truck transportation is the most common. Mining and transportation are inseparable, and they influence and restrict each other. At present, the development trend of mining and transportation technology is mainly reflected in the large-scale mining and transportation equipment, the integration and continuity of mining and transportation links, and computer automation. 5. Rock discharge Rock dumping is the operation of the transport terminal, which transports the stripped topsoil and waste rock to the waste rock yard for disposal. Rock dumping process: rock dumping by railway transportation, road transportation and belt transportation. 6. Dump Waste dump (waste rock dump): a place where stripped materials are piled up, which refers to the place where mining wastes are discharged in a centralized manner. According to the stacking sequence, the dump can be divided into single-bench dump,down the hole bit, covering multi-bench dump and slope-pressing multi-bench dump. The dump is mainly divided into road transport dump, railway transport dump, belt transport dump and hydraulic transport dump according to the dumping process. Return to Sohu to see more Review of past issues Responsible Editor:. wt-dthtools.com

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Original title: Hole guiding scheme of down-the-hole hammer Pile Foundation Project of Plot 1-02 of Xinghe Legend Garden Construction scheme of pile-sinking with down-hole hammer According to the geological survey report and site survey, when the construction of prestressed pipe pile in Block 1-02 of Xinghe Legend Garden crosses the gravelly clay layer, some areas will encounter moderately weathered and slightly weathered spheres or interlayers, which will cause pile breaking or cracking, and it is difficult to sink into the bearing stratum, so it is necessary to use large-diameter pneumatic down-the-hole hammer to cross the moderately weathered and slightly weathered spheres or interlayers. Therefore, a special scheme for down-the-hole hammer guiding hole is prepared. I. Technology and Parameter Analysis of Pile Sinking with Dth Hammer (I) Pile-sinking process with down-the-hole hammer Pneumatic down-the-hole hammer is also called pneumatic impactor. Under the action of air compressor, the large-diameter down-the-hole hammer uses compressed air as the power medium to drive its work, and carries out high-frequency crushing and impact on hard rock; In the process of pneumatic Dth hammer drilling, high-pressure air drives the piston in the impactor to do high-frequency reciprocating motion, and the kinetic energy generated by the motion is continuously transmitted to the drill bit, so that the drill bit can obtain certain impact work. Under the action of the impact energy, the drill bit continuously impacts the rock at the bottom of the hole. Under the action of the impact energy, the rock is crushed in volume. At the same time, the compressed air generated by the air compressor is also used as the well flushing medium to carry the rock debris crushed by the down-the-hole hammer out of the hole. The large diameter Dth hammer has achieved good results in the drilling of block stone, boulder, moderately weathered and slightly weathered hard rock strata, which meets the smooth pile formation of prestressed pipe piles. The hole guiding technology of large diameter pneumatic Dth hammer is to combine Dth hammer construction technology with prestressed pipe pile hole guiding technology to solve the problem of pile sinking in complex strata. The process flow of pile sinking construction in this project is shown in the following figure: A. Dth hammer leading hole; B. Down-the-hole hammer drilling with casing; C. Prestressed pipe pile sinking; D. Prestressed pipe pile sinking to the bearing stratum. ① Lead the pile driver in place to ensure the verticality of the pile driver, and lower the down-the-hole hammer drilling tool (as shown in Fig. 1-a); ② The guide hole penetrates the gravel layer. Start the air compressor and drill with the down-hole hammer until the pilot hole passes through the moderately weathered or slightly weathered sphere (as shown in Fig. 1-b); Expand the full text ③ Pile driver is in place. Pull out the drilling tool, install the pipe pile and conduct the pile sinking operation (as shown in Fig. 1-c); ④ Drive and send piles to the highly weathered mudstone layer, and stop hammering according to the standard (as shown in Fig. 1-d). 2. Machines and equipment: According to the process requirements, the following supporting equipment shall be selected to realize the construction of large diameter pneumatic down-the-hole hammer: Pneumatic Dth hammer and drill bit (Φ560): 2 sets of QZ26 type; ② 30m ³/min Ingersoll Rand medium air compressor: 2 sets; II) Analysis on technical parameters of down-the-hole hammer At present, the Dth hammer is mainly used below 300 mm in China, and the hole larger than 300 mm belongs to the scope of large diameter Dth hammer drilling. There are two main parameters in pneumatic Dth hammer drilling technology: air pressure and air volume. These two parameters mainly meet the requirements of two aspects: 1. Meet the requirements of rock breaking power of driving impactor; 2. The rock debris in the hole shall be discharged out of the well to avoid repeated crushing. Different hydrogeological conditions, borehole structure, borehole depth and borehole diameter parameters have different requirements for air volume and air pressure. The parameters of Dth hammer can be determined according to the following methods. Selected: (1) Air volume. The rated air volume of the impactor selected in this project is 30 m ³/min. With the increase of hole depth and hole diameter, it is necessary to ensure the discharge of rock debris at the bottom of the hole and reduce the repeated crushing of rock powder to achieve ideal drilling efficiency. Generally, it is required that the upward return velocity of air volume in the hole is ≥ 15m/s. At this time, the airflow velocity is greater than the suspension velocity of rock debris. The air volume can be calculated according to the following formula according to the conditions such as the diameter of the drill hole, the outer diameter of the drill pipe, and the upward return air speed on the slag discharge channel: Q=47.1K1K2（D2 -d2 ）V Where: Q — — air supply volume m ³/min; K1 — — correction coefficient of hole depth K1 = 1 ~ 1.1; K2 — — Gushing water system in the hole K2 = 1 ~ 1.5; D — — drilling diameter; D — — outer diameter of drill pipe; V — — Upward wind speed (15 ~ 25m/s). According to the formula, the air return velocity at the orifice is 15 m/s, the borehole correction coefficient of borehole depth is K1 = 1.0, and the water inflow coefficient in the borehole is K2 = 1.5; (2) Wind pressure. QZ26 Dth hammer is a low pressure Dth hammer, the required wind pressure is 0. 5 ~ 0. 7 MPa, but the drilling efficiency is directly affected by the wind pressure, mining dth bit , the greater the wind pressure, the greater the impact power, and the higher the rock breaking efficiency. Therefore, to complete the large-diameter pneumatic down-the-hole hammer drilling, first of all, the working pressure of the impactor should be met to make it work at full load, and at the same time, the pressure along the way (0.0015 MPa/m) brought by the increase of the drilling depth should also be met to overcome the water column pressure below the water level and the pressure difference for removing the debris in the hole. II. Treatment of Main Technical Problems in Hole Guide Construction (I) Insufficient air volume of guide hole Countermeasures: According to the requirements of the borehole diameter and the air volume of the selected air compressor, the down-the-hole hammer and casing drilling process shall be used to guide the hole. According to the guide hole diameter capacity and casing specification met by the air compressor. Through practical application, Dth hammer drilling with casing solves the problem of insufficient air volume, and the ideal effect is obtained in the construction process. (II) Rock debris perforation Countermeasures: The reason why the cuttings are drilled in series is that the distance between the two pilot holes is small. Under the action of high-pressure air, the high-pressure air passes through the pores in the formation, and the boreholes are connected with each other, resulting in the reduction of high-pressure air pressure. In the construction process of prestressed pipe pile Dth hammer leading hole, because of the problem of rock debris string hole, the air volume at the leading hole outlet is less than 15m/s, which can not achieve the purpose of debris removal, so that rock debris enters another hole through the pore, and a certain thickness of sediment is formed in the adjacent hole. Through research and analysis, it is found that the sediment in the hole has little influence on the sinking of prestressed pipe piles, and there are two main reasons: On the one hand, because the sediment particles in the hole are small and the structure is loose, it has little influence on the resistance of pile sinking. On the other hand, the sediment in the hole forms a saturated sand layer under the action of water in the hole, and the saturated sand layer produces sand liquefaction under the action of vibration force during the construction of the pipe pile, so that the sediment in the hole has little influence on the pile sinking. Therefore, in the construction process, no special treatment was carried out on the pile-hole guide hole. Through the actual construction, it was found that the rock debris string hole phenomenon did not have a greater impact on the pile-hole guide pile sinking. (III) How to control the verticality of guide hole Countermeasures: Start the air compressor to drive the Dth hammer to start drilling. During the initial drilling, the drilling speed shall be low, the verticality of the drill pipe shall be rechecked frequently, and it shall be adjusted in time. The down-hole hammer and casing drilling technology is used to guide the hole, which not only solves the problem of insufficient outlet air volume, but also controls the verticality of the guide hole. III. Guarantee of construction period of down-the-hole hammer There are about 200 prestressed pipe piles to be drilled in the concentrated area of weathered and slightly weathered spheres or interlayers in this project. Two down-the-hole hammer drills are arranged to enter the site for construction. Each down-the-hole hammer drill can drill about 5 piles every day. The drilling operation of about 10 piles is completed every day. The drilling work in this area is completed within 20 days. After this part of hole guiding operation is completed, a down-the-hole hammer drill is left as a standby, and hole guiding operation is carried out when the remaining pipe pile construction area needs hole guiding. After receiving the Letter of Acceptance from Party A, immediately organize the mobilization of mechanical equipment and pipe pile materials. This project plans to arrange 2 down-the-hole drills for pipe pile hole guiding operation. During the construction process, the number of hole guiding equipment can be adjusted and increased according to the actual situation, so as to ensure the realization of the total construction period target. END Source: Baidu Library We are committed to protecting the copyright of the author, the source of the content has been marked,dth drilling hammer, only for the dissemination and sharing of knowledge. No other commercial profit, if there is infringement, please contact us to delete. Push Return to Sohu to see more Responsible Editor:. wt-dthtools.com

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Original Title: Information | Will Oil Prices "Fall"? Jingtai Capital After a new round of refined oil price adjustment, domestic No.92 gasoline has entered the "9 yuan era" in an all-round way, while No.95 gasoline in some areas has officially entered the "10 yuan era", and even in a few areas, No.95 gasoline has broken through 11 yuan/liter. For example, after the price adjustment in Hainan, the highest retail price of No.92 gasoline is 10.43 yuan/liter, and that of No.95 is 11.1 yuan/liter. The next round of oil price adjustment is at 24:00 on June 28. International oil price news International oil prices fell on the 15th. By the end of the day, light crude oil futures for July delivery on the New York Mercantile Exchange fell $3.62, or 3.04%,winterization filtration, to $115.31 a barrel, while London Brent crude oil futures for August delivery fell $2.66, or 2.20%, to $118.51 a barrel. Expand the full text | The impact of oil price of 10 yuan If calculated according to the 50L family car fuel tank,thin film distillation, this price increase will cost about 12 yuan more to fill up, which seems not much, but compared with the beginning of the year, the oil price will rise by two yuan, an increase of 25%, and it will cost 100 yuan more to fill up the 50L fuel tank. Increase the travel cost of every family with a car by 25%. According to the data released by the Traffic Management Bureau of the Ministry of Public Security, China has 302 million cars (all calculated according to 50 L fuel tanks), 50l rotovap ,jacketed glass reactor, which will cost at least 3.6 billion yuan more to fill up. In fact, this data is larger, which is a real increase in social costs. The important thing is that most of the transport vehicles in our country are fuel vehicles at present, and the rise in gasoline prices will lead to the rise in transport prices. This part of the rising price will also appear in our daily life. Even if you don't drive, the rising price of gasoline will still affect you. In addition, crude oil not only has the function of producing gasoline, but also can produce heavy oil and aviation kerosene. Large cargo ships and aircraft are big oil consumers. With the rising price of crude oil, the use cost of these people will also rise, which will eventually be superimposed on our daily life. Moreover, crude oil is also an important chemical raw material, and the rising price of crude oil will lead to the rising price of plastics, asphalt and other products. The international oil price has dropped by 6.83%, and the next oil price adjustment is expected to fall. International oil prices have fallen by more than 5.5%. At present, Brent crude oil prices have fallen to the range of $113 per barrel, and US crude oil has also fallen to around $109 per barrel, which makes the next oil price adjustment very hopeful to usher in a decline. As of June 18, light crude oil futures for July delivery on the New York Mercantile Exchange fell $8.03, or 6.83%, to close at $109.56 a barrel, while London Brent crude oil futures for August delivery fell $6.69, or 5.58%, to close at $113.12 a barrel. Next Monday, the negative operation of domestic crude oil change rate will continue to widen. According to the national refined oil mechanism, the price adjustment amount is less than 50 yuan and will not be adjusted. It is hoped that this round of price adjustment will exceed the red line of price adjustment. It has been too long and has not been reduced once. It is not difficult to see that long-distance transport trucks are under greater pressure! This round of domestic refined oil price adjustment will start at 24:00 on June 28, 2022. END The article is the information point collated by Jingtai and does not constitute investment advice. Please read it carefully and return to Sohu to see more. Responsible Editor: (function() { function getBrandHtml() { var brands = [],wiped film evaporator, html = ''; for(var i = 0; i < brands.length; i++) { var brand = brands[i]; if(brands.length i+1) { html+= ''+brand.name+''; } else { html+= ''+brand.name+'、'; } } return html; }; if(document.getElementById('linkBtn')){ document.getElementById('linkBtn').onclick = function() { $('#brands').removeClass('brand');$ ( '# tipInfo').text ( 'Real name responded'); $ ('#linkBtn').remove();$ ('.real-response .content').css('line-height', '20px');$ ('.real-response .time').css('line-height', '20px'); }; document.getElementById('brands').innerHTML = getBrandHtml(); }; })();。 toptiontech.com

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Original Title: Filter Dryer in Chiller Refrigeration System A dry filter installed in the condenser coil outlet liquid line to filter or trap tiny foreign particles and absorb any moisture or moisture present in the chiller system. Moisture can cause compressor valve failure and, in the case of hermetic compressors, often results in breakdown of the motor winding insulation,cbd centrifugal extractor, causing the motor to short circuit or be grounded. The presence of moisture may reduce the performance of the lubricating oil and may result in the formation of metallic or other acidic sludge that can cause clogging or plugging of valves and other oil circuits. The moisture reacts with the refrigerant to form an acidic solution. This acidic solution dissolves the copper tubing and extracts the copper from the copper-based alloys, such as brass or bronze,jacketed glass reactor, present in different parts of the air conditioning system. This copper is deposited as "copper plating" in compressor bearings and valves and can cause system leaks, system vacuuming or improper vacuuming, filter/dryer failure, nutsche filter dryer ,wiped film distillation, oil and refrigerant contamination. The desiccant absorbs moisture; the desiccant material may be solid or liquid. The solid desiccants are silica gel, activated alumina, zeolite, titanium dioxide, while the commercial solid desiccants are activated carbon, metal oxides, and specially developed porous metal hydrides. Silica gel is one of the best and commonly used materials in desiccant, which has good long-term stability. However, it is not a heat resistant material and is therefore only suitable for cryogenic systems. A common dryer today is a capsule filled with a solid desiccant, such as activated alumina or zeolite, which has the ability to absorb acid, protecting the bore of the thermostatic expansion valve from damage by fine debris. Today,wiped film evaporator, the dryer is compatible with all commercially available refrigerants, including r-410a. Large dryers are manufactured in such a way that they can be opened to remove the used moisture absorbent and replaced with a new one, while small dryers are replaced as a complete unit. The suction line filter-drier is a temporary installation to clean up the system and must be discarded after use if the pressure is below the set pressure. A clogged dryer will leave the evaporator with insufficient refrigerant and may cause the compressor to run longer. Return to Sohu to see more Responsible Editor:. toptiontech.com

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Original Title: In the Plastic Restriction Order, Does the Emergence of PE Recycled Material Film Make a Difference? Over the past few years, the development concept of the plastic ban has been widely disseminated. As a major producer and consumer of plastics, China promulgated the Law of the People's Republic of China on the Prevention and Control of Solid Waste Pollution as early as 1995. Since then, from the "plastic ban" and "plastic restriction order" to the promulgation of the "14th Five-Year Plan" action plan for plastic pollution control, China has attached great importance to plastic pollution control. What are the benefits of using PE recycled film? Compared with the original plastic film, recycled plastic film uses less natural resources and energy, thin film distillation ,cbd crystallization equipment, reduces waste and landfill, and is widely used in packaging of various products. Therefore, the application of recyclable plastics will be more and more extensive, and the demand for customers will be more and more. Especially for foreign trade enterprises, many European and American customers have recently asked for the use of recycled plastic bags certified by GRS. PE film that meets the global recycling standard GRS certification is an environmentally friendly product that meets customer requirements and can be recycled. In terms of plastic restriction order, Hualong film is guaranteed. Hualong Film has obtained GRS certification, which is equivalent to obtaining a green pass in the field of flexible packaging, which can meet the needs of brand owners for PCR (Post-consumer Consumer Recycled material PCR) and achieve the unity of commercial value and social value. Hualong Film will operate in strict accordance with the requirements of GRS system documents in the process of procurement, production and sales, so as to provide strong guarantee for customers. Return to Sohu to see more Responsible Editor: (function() { function getBrandHtml() { var brands = [],decarboxylation after extraction, html = ''; for(var i = 0; i < brands.length; i++) { var brand = brands[i]; if(brands.length i+1) { html+= ''+brand.name+''; } else { html+= ''+brand.name+'、'; } } return html; }; if(document.getElementById('linkBtn')){ document.getElementById('linkBtn').onclick = function() { $('#brands').removeClass('brand');$ ( '# tipInfo').text ( 'Real name responded'); $ ('#linkBtn').remove();$ ('.real-response .content').css('line-height', '20px');$ ('.real-response .time').css('line-height', '20px'); }; document.getElementById('brands').innerHTML = getBrandHtml(); }; })();。 toptiontech.com

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Original title: Collection-Gif of structure and principle of extraction equipment Poke the blue word. Principles of mechanical manufacturing "Pay attention to us!"! Extraction is a unit operation to separate liquid mixture according to the difference of solubility of each component in the solvent, commonly known as extraction. Extraction equipment — — Centrifugal extractor — — — — Mixer and settler extractor — — — — Pulsed Sieve Plate Column — — Expand the full text — — Sieve plate extraction column — — — — Reciprocating sieve plate extraction column — — Extraction equipment, also known as extractor, is used to realize mass transfer between two liquid phases. The basic requirement for the extraction equipment is that the two liquid phases of the extraction system can be fully mixed, closely contacted and accompanied by a high degree of turbulence; at the same time,rotovap distillation, the extraction phase and the raffinate phase after mass transfer can be perfectly separated. There are many types of extraction equipment. According to the contact mode of two phases, it can be divided into step-by-step contact type and continuous contact type. According to the power of forming dispersed phase,molecular distillation systems, it can be divided into two types: without external energy and with external energy. The former only relies on the pressure when the liquid is fed into the equipment and the density difference between the two phases to disperse the liquid under the action of gravity, while the latter relies on external energy to disperse the liquid in different ways; In addition, according to the different power of two-phase countercurrent, it can be divided into gravity and centrifugal force. ① Rotary disc tower In the working section, hemp extraction centrifuge ,rotary vacuum evaporator, a group of annular plates are installed at equal intervals to divide the working section into a series of small chambers, and a rotating disk is arranged in the center of each chamber to serve as a stirrer. These discs are mounted on a main shaft located in the center of the tower and are rotated by a mechanical device outside the tower. The rotating disc column is widely used in petroleum refining industry and petrochemical industry because of its simple structure, large capacity and high separation efficiency. ② Pulsating tower Set of sieve plates (without overflow pipe) or packing is installed in the working section. The pulsating liquid flow generated by the pulsating device is introduced into the bottom of the tower through a pipeline, so that the liquid in the whole tower is subjected to reciprocating pulsation. The high-speed relative motion of the pulsating liquid flow between the sieve plates or the packing produces a vortex, which promotes the fine and uniform distribution of the droplets. Pulsating column can achieve higher separation efficiency, but its processing capacity is smaller, so it is often used in nuclear fuel and rare element plants. ③ Vibrating plate tower The sieve plates are connected in a string and are driven by a mechanical device installed above the top of the tower to reciprocate in the vertical direction, thereby stirring the liquid flow and playing a stirring role similar to that in a pulse tower. The design of the extraction column is mainly to determine the diameter of the column and the height of the working section. The column diameter is calculated by dividing the liquid flow by the operating speed to obtain the column cross section. Then the height of the mass transfer unit and the number of mass transfer units are determined according to the characteristics of the tower, the properties of the material system and the separation requirements, and finally the working section height of the tower is obtained by multiplying the two. The height of the working section is also calculated according to the equivalent height and the theoretical progression. The special centrifuge for extraction can use centrifugal force to accelerate the sedimentation and stratification of droplets, so it allows intensified stirring to make the droplets fine, thus enhancing the extraction operation. There are two types of centrifugal extractors: fractional contact and differential contact. In the former, a stirring device is added to the centrifugal separator to form a single-stage or multi-stage centrifugal extractor, including a Luvesta-type centrifugal extractor and a cylinder-type centrifugal extractor. The drum of the latter is equipped with multiple layers of concentric cylinders, and the wall of the cylinder is perforated,wiped film distillation, so that the liquid can be dispersed in both film and drop forms, such as the Podbirnike centrifugal extractor. The centrifugal extractor is especially suitable for the system with small density difference between the two phases or easy emulsification. Because the residence time of the material in the extractor is very short, it is also suitable for the extraction of substances with unstable chemical and physical properties. Return to Sohu to see more Responsible Editor:. toptiontech.com

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با سلام.به دنیای لوکس بلاگ و وبلاگ جدید خود خوش آمدید.هم اکنون میتوانید از امکانات شگفت انگیز لوکس بلاگ استفاده نمایید و مطالب خود را ارسال نمایید.شما میتوانید قالب و محیط وبلاگ خود را از مدیریت وبلاگ تغییر دهید.با فعالیت در لوکس بلاگ هر روز منتظر مسابقات مختلف و جوایز ویژه باشید.
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