372results about How to "Prevent closure" patented technology

The invention discloses a coal seam liquid carbon dioxide fracturing device and method. The device comprises a supplying unit for supplying liquid carbon dioxide, a fracturing pump, a hole packer, a first pipeline and a second pipeline; the hole packer is used for being placed in a drill hole in a coal seam to be fractured and comprises an grouting pipe, a first hole sealing capsule, a second hole sealing capsule and a fracturing pipe, one end of the grouting pipe and one end of the fracturing pipe penetrate through the first hole sealing capsule and are fixed on the first hole sealing capsule, the other end of the fracturing pipe penetrates through the second hole sealing capsule and is fixed on the second hole sealing capsule, and the other end of the grouting pipe is located between the first hole sealing capsule and the second hole sealing capsule. The coal seam liquid carbon dioxide fracturing device and method are capable of increasing the output of a mine and improving permeability of the coal seam and lump coal output rate.

The invention discloses a sponge calcium alginate medical dressing and a preparation method thereof and belongs to the technical field of medicines. The sponge calcium alginate medical dressing is formed by the following steps of: performing freeze drying on blended solution of sodium alginates with different molecular weights and forming, crosslinking and curing by using calcium ions and treating by using a softening agent. The sponge calcium alginate medical dressing has high flexibility, elasticity, air permeability, abrasive resistance, water absorption, biocompatibility and degradability a good barrier property, and the function of stopping bleeding, is easy to remove, has a flat and crackless surface, can substitute a sponge calcium alginate nonwoven medical dressing, can be used for treating various skin traumas such as wounds, wound surfaces of burns, and the like, prevents bacterial infection, promotes tissue repair and accelerates wound heating. Compared with the sponge calcium alginate nonwoven medical dressing, the sponge calcium alginate medical dressing has the advantages of simple production process, low cost and the like and helps to reduce the medical cost of a patient.

The invention provides a fracturing method capable of improving the sand-carrying performance of fracturing liquid. The method comprises the following steps: dispersing degradable fibers by virtue of a dispersion device, and uniformly dissolving the dispersed degradable fibers in a fracturing liquid base solution; pumping into a fracturing blender truck, and mixing with a propping agent for fracturing so as to form sand-carrying fluid; then pumping the sand-carrying fluid dissolved with the fibers into a strata so as to support a formed fracture geometry. When the degradable fibers added into the fracturing liquid are uniformly dispersed in the fracturing liquid, the fibers and a guanidine gum chain with a network structure form a tangled structure, so that the strength of the cross-linked network structure is enhanced, the sedimentation rate of the propping agent is reduced, the sand-carrying capacity of the fracturing liquid is improved, the propping agent is uniformly distributed in a whole crack, a supporting effect is fully realized, the crack is prevented from being closed and thus the fracturing period of validity is increased; furthermore, the added fibers are capable of effectively preventing the propping agent from flowing back and preventing formation sand flow; an oil gas flow passage is additionally increased, so that the fracturing yield-increasing effect is finally realized.

The invention provides an inflatable automobile which is characterized in that the lift force is eliminated by changing the fluid distribution state between the upper part and the lower part of an automobile to change the traditional method that the automobile overcomes the lift force by the weight in hundred years, and therefore, the weight factor does not need to be considered. The bodywork of the automobile is made of light materials; for example, the inflatable layer of the inflatable automobile can be integral or local and can be an outer layer or an inner layer, and meanwhile, a lead-in opening is communicated with a fluid passage, which can greatly reduce the fluid resistance when the automobile runs. In the inflatable automobile which is the lightest in the world, due to the fact that a path through which the fluid of the lower part of the automobile flows is longer than the upper part, and thereby, the pressure of the upper part of the automobile is slightly higher than that of the lower part, and like an invisible hand stably presses the shell of the upper part of the automobile; and compared with the traditional automobiles, the inflatable automobile is more stable and saves more energy when running at high speed. Because the bodywork is the inflatable layer, when an accident happens unfortunately, the self safety is ensured, and meanwhile, the safety of hit automobiles or pedestrians is also increased, the inflatable automobile saves the most energy in the world and is extremely safe.

The invention discloses a high pressure nitrogen-low temperature liquid nitrogen composite fracturing method for oil and gas production increasing. Formation rock is fractured through high pressure nitrogen to form large-scale artificial fractures, then ultralow temperature liquid nitrogen is injected into main fractures, the ultralow temperature characteristic of the liquid nitrogen is utilized to assist in fracturing rock on the wall faces of the main fractures, thus the rock generates secondary fractures which are perpendicular to the main fractures, the self-supporting capacity of the mainfractures is improved, the fracturing degree of a reservoir is increased, closing of the fractured main fracture is prevented, and thus efficient development of the reservoir is achieved. In the whole fracturing process, the high temperature and high pressure nitrogen and the low temperature liquid nitrogen are alternately injected for multiple times, the disadvantage that during conventional fracturing, the reservoir mainly generates a single main fracture is overcome, large-volume network fractures are formed in the reservoir advantageously, and the fracturing production increasing effect of the oil and gas reservoir is improved effectively.

To provide insulated wire producing method and apparatus for producing a high quality corona-resistant insulated wire inexpensively. In the method for producing an insulated wire (D2), a primary coated wire (D1) wherein a primary coating layer (B) is applied to a conductor (A) is preheated at a temperature sufficient for enhancing adhesion of resin to the primary coating layer (B). Subsequently, resin such as polyphenylene sulfide resin is extruded onto the primary coating layer (B) of the preheated primary coated wire (D1), thus producing an insulated wire (D2) coated with a secondary coating layer (C) composed of PPS resin.

The invention discloses is a thin film filling method which comprises the following steps of: firstly supplying reaction gases containing a silicon-containing gas, an oxygen-containing gas, an inert gas and a flowability gas into a reaction chamber; forming a first deposition film in the channels or gaps through an HDP CVD process; stopping supplying the silicon-containing gas and the oxygen-containing gas and continuing to supply an etching gas and the flowability gas to sputter a surface of the first deposition film; stopping supplying the etching gas, continuing to supply the silicon-containing gas and the oxygen-containing gas, and performing film deposition on the sputtered surface of the first deposition film to form a second deposition film; stopping supplying the silicon-containing gas and the oxygen-containing gas and continuing to supply the etching gas and the flowability gas to sputter a surface of the second deposition film; repeating the last two steps, stopping supplying the etching gas, continuing to supply the silicon-containing gas and the oxygen-containing gas, and performing the film deposition on the sputtered surface of the second deposition film to form a third deposition film that completely fills the channels or gaps.

The invention relates to the fields of fractured reservoir working liquid loss control and reservoir protection in the oil and natural gas industries. Aiming at the defects that in the fractured reservoir loss control process, the purposes of blocking cracks and maintaining the flow guiding capability of natural cracks are difficult to be taken into account concurrently by a leaking stoppage material, a harmless solid phase detained in the cracks in the leaking stoppage process is converted into a useful solid phase with the effects of supporting the cracks and maintaining the flow guiding capability of the natural cracks according to the contradiction transformation idea, and then the purposes of preventing and blocking leakage and maintaining the flow guiding capability of the natural cracks are achieved. Through indoor experiments, the types of a high-strength inert supporting material and a soluble filling material are selected by taking the compressive strength and the solution ratio of the leaking stoppage material into account, and material concentration matching is optimized by taking the blocking pressure bearing capability and the supporting crack permeability recovery rate into account. Therefore, the purposes of blocking the cracks in the leaking stoppage process and supporting the cracks and maintaining the flow guiding capability of the natural cracks in the production process are achieved. The invention provides a novel leaking stoppage material selection method, and the novel leaking stoppage material selection method has the important significance on efficient development of fractured reservoirs.

The invention relates to a composite steel slag grinding aid, which solves the problems that grinding aid in prior art is not suitable for grinding steel slag, the grinding time is long, the grinding efficiency is low, the activity of early period in active utilization of steel slag is low, and content of particles not participating reaction is high. The technical scheme comprises the components by weight percentage as follows: 15-30% of surfactant, 20-40% of grinding aid, 20-40% of adjustor, and 5-25% of carrier. The grinding aid provided by the invention can effectively shorten the grindingtime, improve the grinding characteristics and improve effective content of hydrated particles so as to improve the hydrating activity of steel slag. Ground steel slag has high strength, large comparison surface, and small doping amount to further improve the doping amount of steel slag recycled.

The invention discloses a formation method of a transistor. The method comprises the following steps: providing a semiconductor substrate including a first area, wherein a dielectric layer is formed on the surface of the semiconductor substrate, and the dielectric layer is internally provided with a first groove exposing a part of the surface of the first area of the semiconductor substrate; forming a gate medium material layer on the surface of the inner wall of the first groove and the dielectric layer; forming a protective material layer on the gate medium material layer; forming an adherence material layer on the protective material layer by use of a physical vapor deposition technology; forming a first work function material layer by use of an atomic layer deposition technology, wherein the material of the adherence material layer is the same as the material of the first work function material layer; forming a grid metal layer on the first work function material layer, wherein the grid metal layer fills up the groove; and performing planarization processing on the grid metal layer, the first work function material layer, the adherence material layer, the protective material layer and the grid medium material layer by taking the surface of the dielectric layer as a stop layer so as to form a first grid structure disposed in the first groove. The method provided by the invention can improve the performance of the transistor.

A method of monitoring a torque transmission system with a manually switchable gearbox in the power train of a motor vehicle involves the utilization of at least one sensor unit at the input side of the torque transmission system to ascertain relevant positions of the shift lever of the gearbox and the driving torque of the engine of the motor vehicle. The thus obtained shift lever signals are memorized, together with comparison signals which are obtained as a result of filtering of the shift lever signals, and various characteristics of such signals are recognized and identified to indicate the intention of the operator of the vehicle regarding the switching of the gearbox. The thus obtained switching intention signals are transmitted to a controlled clutch operating system.

The invention provides a circular anastomat for clinical gastrointestinal surgery. The circular anastomat comprises a handle assembly, a gun body, a nail cartridge assembly and a nail propping seat assembly which are sequentially connected and arranged; the nail container assembly comprises a nail container housing, a circumferential cutting knife and a nail container; the nail container is in connection fitting with the circumferential cutting knife; the nail propping seat assembly comprises a nail propping seat, a central rod and a knife gasket; the nail container is in contact fitting with the nail propping seat; a nail container fitting surface and a nail propping seat fitting surface are respectively formed at the fitting parts of the nail container and the nail propping seat; the circumferential cutting knife is in contact fitting with the knife spacer; a circumferential cutting knife fitting surface and the knife gasket fitting surface are respectively formed at the fitting parts of the circumferential cutting knife and the knife gasket; the nail container fitting surface, the nail propping seat fitting surface, the circumferential cutting knife fitting surface and the knife gasket fitting surface are all the circumferential curved surfaces which are arranged in a convex and concave way in the circumferential direction. According to the circular anastomat for clinical gastrointestinal surgery, the circumference of the part in which the nail container assembly and the nail propping seat assembly is designed into a shape of a concave-convex curved surface, and therefore, anastomosis lines are in different level, and an anastomosis opening of an intestinal tube is telescopic, and as a result, the problem that the anastomosis opening is hardened and narrow to influence the smooth passing in the cavity and even lead to closing of the cavity can be avoided.

The invention relates to the field of fractured reservoir working fluid loss control and reservoir protection in the field of petroleum and natural gas and provides a method for fracture pre-support and leak resisting and plugging while drilling of a fractured reservoir. In order to overcome the defect that leak resisting and plugging materials of the fractured reservoir cannot give considerationboth to plugging a fracture and keeping the flow capacity of the natural fracture, a harmful solid phase detained in the fracture in the leak resisting and plugging process is converted into a usefulsolid phase which supports the fracture and keeps the flow capacity of the natural fracture, so that the purposes of achieving leak resisting and plugging and keeping the flow capacity of the naturalfracture are achieved. By means of laboratory experiments, considering the compression strength and corrosion ratio of the leak plugging material, a high-strength inertia support material type and a soluble filling material type are preferable; considering the plugging pressure bearing capacity and the permeability restoration of the supported fracture, material concentration matching is optimized; in on-site operation, early-period feeding and later-period supplementing of the leak resisting and plugging material are reasonably controlled. In this way, the purpose of give consideration to both plugging the fracture and keeping the flow capacity of the natural fracture is achieved. The new leak resisting and plugging method has important significance in efficient exploitation of fracturedoil and gas reservoir.

The embodiment of the invention provides a method and device for monitoring an insulation fault of an electric automobile, wherein the method for monitoring the insulation fault of the electric automobile comprises the following steps of: acquiring an insulation resistance value during a last power-off process of a vehicle of the electric automobile and storing the insulation resistance value in anonvolatile memory; reading the insulation resistance value of the vehicle in the last power-off process in each electrifying process, and determining whether the electric automobile can be electrified by using s high voltage according to whether the insulation resistance value of the vehicle in the last power-off process is lower than a second calibration threshold value, wherein, if the insulation resistance value of the vehicle in the last power-off process is lower than the second calibration threshold value, that means the insulation fault exists in the electric automobile, and the highvoltage applied on the electric automobile is prohibited; and if the insulation resistance value of the vehicle in the last power-off process is higher than the second calibration threshold value, thehigh voltage applied on the electric automobile is allowed. According to the invention, whether the high voltage can be applied to the electric automobile or not is determined, thereby avoiding unnecessary closing and opening of a battery main relay, preventing the situation that the power is immediately cut off after the high voltage is applied to the electric automobile, and effectively avoiding unintended power output.

Provided is a method for preparing a seepy material by using city sludge and sugar filter mud. The city sludge and the sugar filter mud are used as a low temperature pore-forming agent and a high temperature pore-forming agent respectively. Industrial waste residue coal ash serves as a raw material, shuiquliu clay serves as binder, waste ceramics serves as aggregate, and glass powder serves as a fluxing agent. A technology process includes drying the raw material, smashing, screening, weighing according to formula requirements, adding an appropriate amount of water, mixing, stirring, prilling, ageing, molding, drying and sintering to obtain products. By means of the method, the seepy material has good seepy performance, can be widely applied to aspects of city construction and separation engineering, such as drainage systems on road surfaces of city, and can achieve effects of beautifying the city and reducing tropical island effect of the city.

The invention relates to a high-pressure gas multistage pre-splitting grouting transformation method for surrounding rock of deep soft rock roadways. The high-pressure gas multistage pre-splitting grouting transformation method has the advantages that the surrounding rock of the deep soft rock roadways is subjected to multistage pre-splitting by the aid of high-pressure gas, special propping agent materials are added into popping agent containers when last-stage gas pre-splitting is carried out, the particle sizes of the propping agent materials are larger than those of cement particles, the propping agent materials are used for propping crack of the artificially pre-split expanded surrounding rock, the crack can be prevented from being closed again under the effect of deep high ground stress, the groutability of the surrounding rock can be improved, then the surrounding rock with the crack can be grouted and reinforced, weak surrounding rock structures and mechanical properties of the roadways can be greatly transformed, the surrounding rock of the deep soft rock roadways can be stably controlled, and difficult problems of closing of crack of existing surrounding rock of existing deep soft rock roadways, extremely poor groutability of the existing surrounding rock and poor grouting effects can be solved; the weak surrounding rock structures and the mechanical properties can be obviously transformed and enhanced, and the bearing capacity of the surrounding rock can be improved; high-pressure gas pre-splitting holes and grouting holes of the surrounding rock are combined with one another, and the high-pressure gas multistage pre-splitting grouting transformation method is easy to operate and implement in fields.

The invention discloses a method for detonation fracture acidizing combined operation. The method comprises the steps of optimizing detonation fracture acidizing combined operation process parameters, performing operation preparation before detonation fracture and filling a pitshaft with liquid, testing stratum absorption amount before the detonation fracture, placing a detonation fracture operation tubular column to a predetermined operation depth, performing pressurization detonation of the tubular column, performing well killing operation, detonating the fracture operation tubular column, testing the stratum absorption amount after the detonation fracture, placing an acidizing operation tubular column, performing pumping injection acid liquid slug, lifting the acidizing operation tubular column, placing an electric pump production tubular column and performing electric pump liquid drainage and well opening alkalifying neutralization, placing an electric pump production Y tubular column without a Y tubular column, performing pumping injection of acid liquid slug, placing the Y tubular column, performing electric pump liquid drainage and well opening alkalifying neutralization and the like. The method has the advantages that detonation fracture and acidizing effects can be further enhanced, the acid liquid injection capability is enhanced, the acidizing radius is expanded, crack closure is further avoided, and a physical effect is enhanced; a detonation fracture effect can be enhanced, a follow-up acidizing step is selected flexibly, and the operation step is omitted while an operation effect can be guaranteed.

The invention discloses a rotor folding and unfolding device for a vertical take-off and landing compounding layout unmanned aerial vehicle. Besides all components of a conventional fixed wing unmanned aerial vehicle, the rotor folding and unfolding device further comprises rotors, rotor arms, connecting rods, a linear motor, a guide rod, flow baffles and springs. One end of each rotor arm is installed on a rotary shaft in a rotor cabin on the side face of a vehicle body, and the other end of each rotor arm is provided with a direct-current brushless motor and the corresponding rotor. When the rotors do not need to be used by the compounding unmanned aerial vehicle, the linear motor installed at the middle portion of the vehicle body is controlled to pull the guide rod and the connecting rods to move, the rotor arms are rotated and retract back into the corresponding rotor cabins, and the flow baffles are closed; and when the rotors need to be used by the compounding unmanned aerial vehicle, the linear motor is controlled, so that the rotor arms are rotated and extend to the outer side of the vehicle body. The unmanned aerial vehicle with the rotor folding and unfolding device has the functions of conventional fixed wings and further has the functions of vertical take-off and landing, longitudinal and transverse maneuvering and the like. In a fixed wing mode, the rotors retract into the rotor cabins, the flow baffles are closed, and the aerodynamic characteristic influence caused by a rotor structure is avoided.

The invention discloses a phosphate rock grinding aid and a preparation method thereof, which are mainly suitable for ore grinding production of flotation magnesium-removal phosphate rock. The phosphate rock grinding aid is prepared from the oleic acid, the lauryl amine and the triethanolamine at the weight ratio of (300-410):(150-190):(120-190). The phosphate rock grinding aid is good in dispersion effect, improves the grinding efficiency of phosphate rock, increases the ore grinding yield, reduces the energy consumption, increases the new surfaces of particles and reduces the dosage of the flotation magnesium-removal phosphate rock.

The invention discloses an electric vehicle, an insulation detection method, an apparatus and a system thereof. The method comprises the following steps of receiving a closing instruction sent by a diagnostic apparatus, wherein the closing instruction is used for indicating to close a first relay or a second relay in a battery pack of the electric vehicle; after the closing instruction is executed, reading a corresponding resistance value of the first relay or the second relay after being closed; detecting whether the corresponding resistance value satisfies a preset insulation condition and acquiring an insulation detection result; returning the insulation detection result to the diagnostic apparatus. By using an existing insulation detection method of the electric vehicle, after a high voltage is applied to the electric vehicle, through a cell management system, an insulation resistance of the electric vehicle is detected so that a person can easily get an electric shock and a high voltage component is easily damaged. In the invention, the above technical problems are solved.

The invention provides a connector sealing element and allows the inspection of the existence of the opening which is not correctly formed in terminal insertion holes of the connector sealing part. The connector sealing element comprises a sealing part body and a plurality of terminal insertion holes each of which is provided with an upper diaphragm part and a lower diaphragm part which are mutually separated and which are connected through a thin layer. Preferably, the terminal insertion holes are provided with diaphragms and comprise an approximately bent groove and an approximately bent thin layer. Preferably, the terminal insertion holes are provided with diaphragms with thin layers which are located in the direction which is coincident with a diagonal of a rectangular cross section of the terminals so as to cause the angles of the terminals to collide against the correspondent ends of the thin layers.

The invention discloses a method capable of preventing pre-existing cracks against closure by adoption of high-energy gas fracture. The method comprises following steps: 1, perforation by a perforating gun: adopting the perforating gun put lower into a well bore of an oil-gas well for perforation and forming multiple perforation tunnels in a target interval; 2, construction of an artificial bottom of the well: constructing the artificial bottom of the well at the bottom of the well bore of the oil-gas well; 3, downward placement of an oil pipe and injection of pressure baffle liquid: downwardly placing the oil pipe to the position where the target interval is located, injecting pressure baffle liquid into wellbores of the oil-gas well by means of the oil pipe till a sleeve pipe and the oil pipe are poured with pressure baffle liquid; 4, injection and displacement of fracturing propping liquid with the process as follows: primary injection of separation liquid, injection of fracturing propping liquid, secondary injection of separation liquid and displacement of fracturing propping liquid till the fracturing propping liquid is displaced to the target interval; 5, tripping of the oil pipe, hoisting and displacement of explosive columns; 6, initiation of explosion. The method capable of preventing pre-existing cracks against closure by adoption of high-energy gas fracture has following beneficial effects: the method has simple steps and a reasonable design and is conveniently realized and has fine usage effect; and a crack closure problem during the process of high-energy gas fracture is effectively solved.

The invention provides a method for fracturing high energy gas, comprising the following steps of: a. descending a high energy gas fracturing construction tube to a position which is 40 to 60m from a target layer and pausing the descending of the tube; b. injecting sand-laden fluid laden with proppant into a tubing-casing annular space; c. descending the construction tube to the target layer; d. igniting for fracturing. The method for fracturing the high energy gas of the invention can improve the construction effect for fracturing the high energy gas, and prolong the valid period of a measure.

The invention belongs to the technical field of environment-friendly materials and discloses a composite skeleton reinforced ceramic based filter material preparation method. The method includes: uniformly stirring and dispersing modified graphene oxide, macromolecular organic matter dispersion liquid and an antifoaming agent to obtain graphene oxide dispersion liquid; mixing diatomite with strongacid solution, performing hydrothermal reaction, filtering, washing, drying and calcining to obtain pretreated diatomite; subjecting the pretreated diatomite, the graphene oxide dispersion liquid, calcium carbonate, magnesium carbonate, sodium fluoride and nano iron powder to ball milling and mixing, and then standing for aging to obtain an aged material; rubbing the aged material to make balls,naturally drying, performing heat-preservation sintering at different temperatures under the protection of nitrogen while the temperature rise rate is controlled, cooling, and discharging to obtain acomposite skeleton reinforced ceramic based filter material. The ceramic based filter material prepared according to the technical scheme has excellent filtration performances as well as mechanical properties and has a promising prospect in development of the technical industry of environment-friendly materials.

The invention relates to the technical field of fiber concrete additive fiber smashing, in particular to a fiber concrete additive fiber smashing device. The device comprises a supporting frame, a smashing mechanism and a stirring mechanism, the supporting frame is of a [-shaped structure with a downward opening, and the smashing mechanism and the stirring mechanism are sequentially installed in the supporting frame from top to bottom. Through cooperation of the smashing mechanism, the stirring mechanism and a grinding plate, the three-stage smashing effect on glass fibers is achieved, meanwhile, the smashing efficiency of the glass fibers is improved, the problem that the glass fibers and cement base materials are difficult to evenly mix due to the fact that the smashing effect of single-time smashing of the glass fibers is poor is solved, meanwhile, the adhered glass fibers are scraped through a material scraping plate and a scraping plate in the smashing mechanism and the stirring mechanism respectively, so that the problem that the glass fibers are accumulated on a smashing roller and a stirring barrel to influence the smashing effect of the smashing roller and the stirring barrel on the glass fibers is solved.

The invention discloses a method of preparing a porous biomedical metal, ceramic or metal / ceramic composite material. The method comprises the following steps of based on a secondary pelletizing technology that metal micro powder or / and ceramic micro powder with narrow particle size distribution are used as primary particles, by using the primary particles as materials, adding a binder, carrying out secondary pelletizing by a centrifugal pelletizing method to obtain secondary nearly-spherical particles; forming the screened secondary nearly-spherical particles with the narrow particle size distribution in a mould cavity of a mould with special shape and dimension in a close packing mode, and sintering at a high temperature to obtain a medical material or product with a special porous structure and constitution. Compared with the preparation method of the porous biological material in the prior art, the preparation method disclosed by the invention has the advantages of simple process, good repeatability and the like, easily realizes bath production, is capable of preparing the porous biological material with a gradient porous structure and high mechanical strength at the same time, and is especially suitable for a bone grafting material for repairing bearing part bone defect.

The invention discloses an underground coal mine hydraulic sand fracturing system and method. The underground coal mine hydraulic sand fracturing system comprises a water supply system, a fluid distribution system, a sand mixing system, a fracturing system and a high-pressure manifold system; the fracturing system is formed by two fracturing pump groups in parallel; the high-pressure manifold system comprises a Y-shaped tee, and two inlet channels of the Y-shaped tee separately communicate with outlets of the two fracturing pump groups; and the fluid distribution system comprises two fluid distribution pools. The fracturing method is implemented based on the fracturing system and comprises the steps that fracturing liquid is prepared by densifiers, crosslinking agents, anti-swelling agents, gel breakers and water according to proportion; the particle size of a supporting agent is 40-70 meshes, and the volume density of ceramsite sand is 1.25g / cm<3>; and fracturing is carried out according to the sequence of first hydraulic fracturing seam generating and later fracturing liquid sand-carrying fracturing support. The underground coal mine hydraulic sand fracturing system has the beneficial effects that the fracturing system is simple in structure and reasonable in layout, and is suitable for sand-carrying fracturing use of underground narrow and small or long and narrow space; andthe fracturing liquid prepared by the fracturing method has suspended sand characteristic, can be suitable for upward drilling sand-carrying fracturing, and has the environmental protection characteristic of being capable of directly discharged.

An apparatus is for purifying an exhaust gas flowing from an internal combustion engine equipped with a turbocharger (2), and includes an injector (12), a vaporization enhancer (5), and an NOx sorbing-and-reducing catalyst (4). The injector (12) injects a liquid reducing agent into the exhaust gas, and is disposed on an upstream side of the turbocharger (2). The vaporization enhancer (5) is disposed between the injector (12) and the turbocharger (2). The NOx sorbing-and-reducing catalyst (4) is disposed on a downstream side of the turbocharger (2). The vaporization enhancer (5) enhances a vaporization of the liquid reducing agent. Accordingly, the liquid reducing agent hardly adheres onto the inlet-end of the NOx sorbing-and-reducing catalyst (4). Consequently, PMs scarcely adhere onto the liquid reducing catalyst. Therefore, the exhaust pressure loss is inhibited from increasing, and the NOx purifying performance upgrades.

The invention discloses a novel muscle traction device for general surgery department surgery. The device comprises a support. The side walls of the left and right ends of the support are each provided with a rectangular through hoe. The rectangular through holes are movably clamped to a clamping plate. A fastening bolt is arranged on the upper surface of the clamping plate, the fastening bolt is located on the upper side of the support, a fixing device is arranged on the upper sides of the rectangular through holes, the middle of the side face of a first double-screw bolt of the fixing device is in threaded connection with the side wall of the support, and a stretching device is arranged on the upper side of the fixing device. The novel muscle traction device for general surgery department surgery can be fixedly connected with a bed body, operation is convenient, a patient can be fixed by arranging the fixing device, and the phenomenon that a wound is closed when a patient touches the wound is avoided; meanwhile, the stretchable device is stretchable and is provided with scale marks, the size of an opening is convenient to adjust and record, a hook is liftable, the opening is convenient to fix, the phenomenon that the opening is closed due to sliding of muscle is avoided, and the device is convenient to use and easy to operate.