208results about How to "Improve anti-clogging effect" patented technology

The invention discloses a sintered water permeable brick and a preparation method thereof, and belongs to the technical field of sintered ceramics. According to the water permeable brick, structural pug in a surface layer is composed of, by weight, 45-65% of structural fine aggregates, 20-30% of plastic high-temperature binders and 15-25% of water, pore forming pug in the surface layer is composed of, by weight, 20-50% of pore forming agent aggregates, 45-80% of plastic pore adding binders and 0-5% of biomass fuel internal combustion catalysts, and a blank of a secondary surface layer is composed of, by weight, 70-75% of coarse structural aggregates, 10-15% of plastic high-temperature binders, 0-5% of pore adding agent coarse aggregates and 10-15% of water. A blank of the surface layer and the blank of the secondary surface layer are prepared firstly, the blank of the surface layer contains the orderly distributed structural pug and the pore forming pug, and then single-shaft extrusion forming, drying and sintering are conducted to obtain the water permeable brick. The water permeable brick has high water permeable rate, high strength, high abrasion resistance and durability and is a paving material with excellent ecological and environmental functions.

The invention belongs to the technical field of petroleum drilling engineering and particularly relates to a negative-pressure jet-type particle impact drilling injection device. A balanced-pressure jet pipe is installed on one side of a material inlet at the top of a high-pressure particle injection tank, a jet anti-blocking sprayer is arranged at one end of the balanced-pressure jet pipe, the other end of the balanced-pressure jet pipe is arranged at the top of a main pipe manifold, the jet anti-blocking sprayer is arranged at the bottom of the high-pressure particle injection tank, a negative-pressure particle injection pipe is arranged at the bottom of a material outlet, a nozzle is arranged at one end of the negative-pressure particle injection pipe and communicated with the main pipe manifold, a regulating pipe is arranged at the bottom of the main pipe manifold, the tail end of the regulating pipe is communicated with an outlet of the negative-pressure particle injection pipe, and a regulating valve is arranged in the regulating pipe. The negative-pressure jet-type particle impact drilling injection device adopts the self-rotating type jet anti-blocking sprayer, achieves omnibearing and multi-angle stirring on the material outlet of the high-pressure particle injection tank, is easy, convenient and safe to operate, serves as one of three core systems of the particle impact drilling new technology, and is simple in processing and manufacturing, convenient to detach, stable in performance and capable of remarkably improving the drilling speed of extra-hard wear-resisting stratum of deep well.

The invention belongs to the technical field of sewage treatment equipment, and in particular relates to a sewage filtering device. The sewage filtering device is composed of a hydraulic rotary filter cylinder system, a back-flushing device, a supporting device and a hydraulic speed regulation device, wherein the hydraulic rotary filter cylinder system is composed of a rotary shaft (7), a sewage inlet tube (9), blades (11), a filter screen (14) and a filter screen frame (25). The sewage filtering device is characterized in that the two ends of the rotary shaft are fixed on a bearing (8), the circular-ring-shaped filter screen frame is arranged on the rotary shaft, a conical-cylinder-shaped filter screen with two opened ends is arranged on the outer surface of the filter screen frame, the diameter of an a end of the filter screen is larger than that of a b end of the filter screen, the blades are uniformly arranged on the inner surface of the filter screen frame at the a end, the sewage inlet tube (9) is arranged in the filter screen frame in a suspending manner, and the opening of the sewage inlet tube (9) is aligned with one of the blades. The sewage filtering device synchronously performs a filter treatment and multi-effect clogging prevention, and rotation and speed regulation are driven by hydraulic power, so that the energy consumption is reduced, the failure rate is low, equipment cost is low, machining is simple and easy to implement, and the operation of the equipment is more stable and reliable.

The invention relates to steel slag pervious concrete which contains the following materials in percentage by weight: 14-18% of ordinary Portland cement, 65-75% of blended aggregate, 0.8-1.4% of waterreducing agent, 0.5-1% of metakaolin, 2-3% of modified sizing material, 0.2-0.4% of calcium carbonate powder and the balance of water, wherein the mixed aggregate is a combination of steel slag and macadam; and the modified sizing material is a combination of modified polyacrylate and butadiene styrene rubber. According to the scheme, the concrete material is modified, and therefore, the blockage-proof performance of the concrete after being used for a long time is improved, the rate for rainwater to permeate concrete is increased, the rainwater residual amount in the concrete is effectivelyreduced, the rainwater collection rate is increased, and the practicability of an impounding pavement structure is improved.

The invention discloses a device and a production technology for treating ternary-monomer wastewater and extracting sodium sulfate. The device comprises a plate-and-frame filter press, a mother liquid heat exchanger, a stripping tower and a condenser which are sequentially communicated through a pipeline, wherein the condenser is communicated with a methane distillation tower through the pipeline. The production technology comprises the following steps of: (1) pumping neutralized mother liquid into the plate-and-frame filter press, preheating the mother liquid through the mother liquid heat exchanger, and then pumping the mother liquid into the stripping tower from the top of the stripping tower; (2) pumping steam into the stripping tower from the bottom of the stripping tower, after methane in the mother liquid is brought out by the steam, condensing the steam through the condenser, then entering the methane distillation tower, and separating to obtain methane; (3) pumping liquid at the bottom of a high-temperature tower into an evaporation and concentration kettle to be concentrated, steaming out moisture, and using the steam generated by the evaporation and concentration kettle for heating the mother liquid heat exchanger; and (4) after concentrating a material in the evaporation and concentration kettle, placing the concentrated material in a crystallizing pond, and feeding the mother liquid, Na2SO4.10H2O in which is separated out in the crystallizing pond, into a mother liquid neutralization pond to be reused.

The invention discloses a coaxial double-speed threshing cylinder of a threshing device of a half-feed combine harvester. The coaxial double-speed threshing cylinder comprises a high-speed cylinder and a low-speed cylinder, wherein the low-speed cylinder is positioned on the left side of the high-speed cylinder; the outside diameter of the high-speed cylinder is less than the inside diameter of the low-speed cylinder on the connection part of the high-speed cylinder and the low-speed cylinder; the left end of the body of the high-speed cylinder is 15 to 25mm extended into the body of the low-speed cylinder to form a socket joint structure; the low-speed cylinder is provided with threshing plate teeth on the socket joint part with the high-speed cylinder; and the threshing plate teeth are 3 to 5mm extended out of the right end face of the body of the low-speed cylinder. The coaxial double-speed threshing cylinder has the advantages of high integral structural strength, simple manufacturing, reliable work and good anti-blockage effect, and can excellently adapt to different characteristics of physical states of materials at a front threshing section and a rear threshing section in the threshing chamber, and several main performance indexes such as threshing rate, damage rate, loss rate and energy consumption well are simultaneously considered.

The invention relates to a ceramic water-permeable brick and a preparation method thereof and belongs to the technical field of paving materials. The ceramic water-permeable brick is formed by a base body layer and a face layer, wherein the base body layer is prepared from the effective raw materials of ceramic waste, firebrick waste, feldspar and borosilicate glass; the ceramic waste and the firebrick waste are particle materials, the others are fine powder materials, the particle materials contain a coarse particle material with the particle size of 5 to 3 millimeters and a fine particle material with the particle size of 3 to 1 millimeters, and the coarse particle material is 35% to 60% of the total ingredient mass of the base body layer; the face layer is prepared from the effective raw materials of ceramic waste, corundum waste, feldspar and borosilicate glass; the ceramic waste and the corundum waste are particle materials, the others are fine powder materials, and the particle materials are fine particle materials with the particle size of 3 to 1 millimeter. The ceramic water-permeable brick has the advantages of good water-permeable performance, better wear resistance and clogging resistance and good comprehensive performance. The preparation method sequentially comprises the steps of preparing materials, mixing materials, molding, drying and sintering; the base body layer and the face layer are mixed separately; in the step of mixing materials, an organic binder and water for shaping are additionally added, and then the materials are distributed, compressed and formed. The preparation method has the advantages of being simple and reliable, being easy to implement and guaranteeing quality.

The invention discloses a sewage pump anti-blocking device. The anti-blocking device comprises a water inlet pipeline, a baffle board A and a baffle board B are connected to the upper side wall and the lower side wall of the right part in the water inlet pipeline, the right end of the baffle board A and the right end of the baffle board B are connected with hooks, the middle of the upper end and the middle of the lower end of the outer side wall of the water inlet pipeline are connected with a first driving motor and a second driving motor, the output shaft of the first driving motor and the output shaft of the second driving motor are connected with a first driving shaft and a second driving shaft, the first driving shaft and the second driving shaft are connected with a crushing blade Aand a crushing blade B, a groove is formed in the lower left side wall of the water inlet pipe, a filter screen and an activated carbon net are clamped in the groove, a slag outlet pipe is connected to the lower end of the outer side wall of the water inlet pipeline, and the left end of the water inlet pipeline is fixedly connected with a sewage pump. The device has the advantages that impuritiesare subjected to classified processing, the treatment efficiency is high, the blockage of impurities on the sewage pump is reduced to the maximum extent, the anti-blocking effect is good, the servicelife of the sewage pump is prolonged, and the sewage conveying progress is improved.

The invention discloses a production technology for an abrasive paper of furniture. The production technology comprises the following steps: preparing a base paper, coating a waterproof coating, an anti-sliding layer, primer and abrasive sand, pre-drying, coating surface glue, drying, cutting, curing under high temperature, coating an anti-plugging coating, packaging and forming an end product. Alatex paper is used as the base paper; the waterproof coating coats one surface of the base paper; the anti-sliding layer coats the outer surface of the waterproof coating; the adhesive primer coats the other surface of the base paper so as to form a primer layer; the adhesive sand is implanted into the primer layer through a static sand planting technology and then the pre-drying treatment is performed; the surface glue coats the surfaces of the primer and the adhesive sand after the pre-drying treatment; the cutting is performed after the drying treatment and then the curing under high temperature is performed; the anti-plugging coating is coated on the surfaces of the primer and the adhesive sand after the curing under high temperature; lastly, the treated product is packaged and the end product is acquired. A functional coating technology is adopted by the production technology for the abrasive paper, so that the adhesive paper with high flexibility, high strength, excellent anti-plugging effect, excellent waterproof property and easiness in processing can be acquired.

The invention relates to medical human body wound drainage consumables and provides a three-cavity negative-pressure wound irrigation and drainage tube. The negative-pressure wound irrigation and drainage tube comprises an in-vivo drainage tube and an in-vitro connection tube, wherein the in-vivo drainage tube adopts an integral structure and is provided with a main drainage tube, an irrigation tube and a guide wire implanting tube which are parallelly arranged lengthways; the main drainage tube is arranged in the geometric center of the in-vivo drainage tube, and the irrigation tube and the guide wire implanting tube are located at the periphery of the main drainage tube; a lower groove is formed in the outer wall of the in-vivo drainage tube, and a plurality of drainage openings are formed in the lower groove and communicated with the main drainage tube; the in-vitro connection tube comprises an in-vitro drainage tube, an in-vitro irrigation tube and an in-vitro guide wire implanting tube which are mutually independent; the in-vitro drainage tube, the in-vitro irrigation tube and the in-vitro guide wire implanting tube are respectively communicated with the main drainage tube, the irrigation tube and the guide wire implanting tube which are arranged at the outer end of the in-vivo drainage tube. The three-cavity negative-pressure wound irrigation and drainage tube mainly adopts a three-cavity structure, is used for drainage of wounds deep in a human body and has the effects of being accurate in implanting, favorable in drainage and irrigation, resistant to blockage, and the like.

An underground aperture pipe for water-saving infiltrating irrigation is made up of used rubber (48-79 wt.%) and polyethylene (PE) (18.5-48 wt.%) through pulverizing the used rubber, stirring powdered rubber and polyethylene at high stirring speed while heating to 90-100 deg.C, adding lubricant, foamer, foaming promotor and nucleator, feeding to single-screw extruder, extruding out at 145-190 deg.C, shape fixation and cooling. It features 3.8-4.3 MPa of tensile strength, 80-140% of extension at break, no cracking at -30--40 deg.C, and 0.01-0.4 mm of aperture diameter.

The invention discloses a particle-containing smoke dust filtering device, and relates to the technical field of smoke dust treatment. The device comprises a base; the top surface of the base is fixedly connected with a group of damping parts; the surface of the base is fixedly connected with an outer tank through damping parts; the side surface of the outer tank fixedly communicates with a guidecover; one surface of the flow guide cover is fixedly communicated with a purified gas exhaust pipe; the top surface of the outer tank is fixedly connected with two vibration motors which are symmetrically arranged; a filter cartridge is rotationally connected into the outer tank through a bearing; the lower end of the filter cartridge extends out of the outer tank; an ash discharge port is fixedly formed in one end, extending out of the outer tank, of the filter cartridge. Through the design of the filter cartridge, particulate matters in smoke dust can be quickly separated, Meanwhile, through the design of the high-pressure spray pipe, impurities adhered to or blocked in the filter holes can be quickly removed by utilizing high-pressure air and a reverse blowing principle.

The invention discloses an expressway bridge drainage structure, and belongs to the technical field of expressway bridge drainage. The drainage structure includes drainage ditches on an expressway bridge pavement, draining holes at the bottoms of the drainage ditches, anti-blocking assemblies at the internals of the draining holes, drainage ports at the bottoms of an expressway bridge and fixing concrete blocks on the two sides of the expressway bridge; the drainage ditches are located on the two sides of the expressway bridge pavement; multiple draining holes are arranged in the length directions at the bottoms of the drainage ditches; the bottoms of the draining holes pass through the expressway bridge pavement; the anti-blocking assemblies are arranged corresponding to the number of thedraining holes; the internals of the fixing concrete blocks are provided with driving assemblies for driving the anti-blocking assemblies to work; and the number of the driving assemblies is consistent with the number of the draining holes. The draining pressure of the main body drainage ditches can be shared by the multiple drainage ports, so that high draining efficiency can be achieved; and the internal of each drainage port is provided with the anti-blocking assembly to perform the cleaning of the drainage ports, so that good anti-blocking effects can be realized, and follow-up overhauling can be reduced.

The invention belongs to the field of municipal facilities, and particularly relates to an anti-blocking rainwater perforated strainer for municipal roads. The strainer comprises a supporting frame, wherein the supporting frame is detachably connected to a cover plate, the cover plate is provided with fixed rods, a movable rod is movably connected between the adjacent fixing rods through a bourdontube, the fixed rods and the movable rod each are provided with a cutting blade, the movable rod is rotationally connected to a water collecting tank through a guide rod, and the end, far away from the cover plate, of the water collecting tank is rotationally connected to a bottom plate. According to the anti-blocking rainwater perforated strainer for the municipal roads, a water inlet of the strainer is effectively prevented from being blocked by impurities when working during rainwater weather, the discharging efficiency of rainwater is improved, and normal operation of a traffic order is guaranteed.

The invention relates to an anti-blocking negative ion air purification device which comprises a shell, an air inlet pipe, a negative ion generator arranged in the shell, an exhaust fan, a filter screen, a dredging mechanism and a water injection mechanism. According to the anti-blocking negative ion air purification device, air in the shell is exhausted through the exhaust fan; external air enters the shell; particle impurities are purified through the filter screen; water is sprayed through a spray head, and impurities in the air are dissolved in water; meanwhile, water is sprayed on the filter screen to impact the filter screen, so prevention of filter screen clogging is realized; the motor drives the hairbrush to reciprocate, so dust on the filter screen is brushed away; the motor simultaneously drives a drum to rotate, water is sprayed to each part of the filter screen, and better anti-blocking effect is achieved; sedimentation of particulate matter is accelerated through negativeions generated by the negative ion generator, better purification effect is achieved, more negative ions are generated through rotary water spraying, better purification effect is achieved, water resources are saved through the water injection mechanism, and the water level in the shell is kept stable.

The invention discloses a film sandpaper production method. The method includes the steps of PET (polyester) film treating, primer coating, abrasive embedding, pre-drying, composite adhesive coating, primary drying, curing and anti-clogging coating applying. A PET film treated through corona or chemical coating has strong adhesion. The primer is a bottom layer adhesive composed of polyamine resin, a curing agent and an organic solvent of xylene. A second layer adhesive comprises modified phenolic resin, a coupling agent and a grinding aid, enables abrasive to be firm in adhesion and can obtain good sharpness and cutting polishing capacity. The anti-clogging coating is composed of lubricating filler, an adhesive and an antistatic agent. By means of the film sandpaper production method, sandpaper good in flexibility, not prone to deformation, high in strength, good in anti-clogging effect and flat in machining surface can be produced.

The invention discloses a soil remediation system based on an electric auxiliary permeation technology. The system comprises an extraction well and an injection well which are arranged in polluted soil, and further comprises a soil remediation agent injection device and an electric auxiliary permeation device, the soil remediation agent injection device is mounted in the injection well, and is configured to convey a soil remediation agent into the injection well, the electric auxiliary permeation device comprises a cathode, an anode and a power supply, the cathode is arranged in the extractionwell, the anode is arranged in the injection well, the cathode and the anode are both connected with the power supply, the cathode, the anode and an electrolyte solution composed of liquid in contaminated soil form an electrolytic tank together when the power supply is connected, and the soil remediation agent can automatically permeate into the extraction well from the injection well under the action of the electrolytic tank. The limitation that chemicals are added to the soil layer only in a pressurizing mode traditionally is broken through, the chemical adding effect and stability of the in-situ multi-point chemical injection process can be guaranteed, excessive pressure cannot be applied to the soil layer, and disturbance and damage to the soil layer cannot be caused.

The invention discloses a cleaning-free flame arrester and relates to the technical field of flame arresters. The cleaning-free flame arrester comprises a left shell and a right shell, wherein the sides, opposite to each other, of the right shell and the left shell are fixedly connected through a first bolt; first flame retardant cores are movably connected with the opposite sides of the left shell and the right shell; and sealing gaskets are movably connected between the two first flame retardant cores and the left shell as well as between the two first flame retardant cores and the right shell. According to the cleaning-free flame arrester, second flame retardant cores and the first flame retardant cores rotate relative to each other, impurities such as greasy dirt blocked in the middleof meshes can be separated from the meshes, the impurities can be blown away from the meshes by using high-pressure gas, the anti-blocking effect is better, the flame arrester does not need to be manually disassembled for cleaning, the labor intensity of workers is greatly reduced, the cleaned impurities can be directly discharged out of the shells through a sewage discharge pipe, the operation isconvenient, and the sealing gaskets and sealing rings jointly act, so that the sealing effect of the flame arrester can be improved, gas leakage is prevented, and reliability is improved.

The invention provides softwood fine grinding abrasive cloth, and relates to abrasive cloth for metal grinding and polishing, in particular to fine grinding abrasive cloth. The softwood fine grinding abrasive cloth adopts the following process steps: 1, unreeling; 2, impregnation; 3, coating; 4, press polishing and forming; 5, winding; 6, unfolding of a file and trademark printing; 7, base rubber coating; 8, softwood grain sand planting through vibration and gravity; 9, predrying; 10, coating of rubber covering and abrasive material; 11, main drying; 12, rolling; 13, unreeling; 14, coating of the rubber covering; 15, main drying; 16, solidification; 17, bending; 18, coiling; and 19, warehousing. The softwood fine grinding abrasive cloth has the characteristics of waterproofness, good grinding and polishing performance, high anti-blockage capability, and the like. Particularly, the softwood fine grinding abrasive cloth has extraordinary performance in maintaining the consistent surface finish. The softwood fine grinding abrasive cloth is suitable for high-speed grinding which is carried out in the presence of cooling water.

The invention discloses a water pump valve facilitating water flow controlling. The water pump valve comprises a valve body, a valve cover is fixedly arranged above the valve body, a sealing part is fixedly arranged on the upper surface of the valve cover, and a connecting rod is movably connected to the interior of the sealing part; the lower end of the connecting rod is located in the valve cover, external threads are formed in the outer surface of the connecting rod, and the bottom end of the connecting rod is located in a cavity formed inside a valve rod; the connecting rod rotates to drive the valve rod to vertically move up and down, so that a valve plate is separated from a valve body sealing gasket, and a water inlet cavity can communicate with a water outlet cavity; then water flow data is monitored in real time under the action of a water flow sensor, the water flow data is guided into a digital display screen to be displayed, people can visually know an accurate situation ofthe water flow through the digital display screen, people can conveniently record water the water flow data during use, the water flow can be more accurately adjusted according to the data, and onlythe distance between the valve plate and the valve body sealing gasket is required to be adjusted.

The invention relates to a submersed nozzle for steel making and continuous casting tundish, in particular to a non-oxide enhanced material for a slag line of a submersed nozzle. The material comprises the components in percentage by mass as follows: 5.5%-8% of ZrB2, 75%-78% of m-ZrO2, 6%-8% of graphite, 2%-3% of Al, 5%-6.5% of O'-Sialon, 1.0%-2.0% of Y2O3-PSZ and the balance of impurities; and 8-10% of a modified resin binding agent is additionally added. The non-oxide enhanced material for the slag line of the submersed nozzle has excellent corrosion resistance and plugging resistance, can effectively reduce carbureting of molten steel, and is more suitable for producing low -carbon steel and ultra-low carbon steel.

The invention relates to a plugging preventing sewer cover plate which comprises a horizontally arranged cover plate body. The cover plate body is provided with multiple strip-shaped water draining holes, the bottom of the cover plate body is provided with a rotary shaft, the rotary shaft is rotatably connected with multiple dirt blocking rods, one end of each dirt blocking rod is fixedly connected through a connecting rod, the ends away from the connecting rods are upward overturned to extend out of the strip-shaped water draining holes when the multiple dirt blocking rods rotate on the rotary shaft, hanging chains are arranged on the connecting rods and are hung with water receiving boxes with the tops for water to be injected, and the bottoms of the water receiving boxes are provided with water draining ports. The plugging preventing sewer cover plate utilizes the gravity of rainwater, rainwater falls into the water receiving boxes when it rains, the gravity of each water receivingbox is increased to cause downward fall, the water receiving boxes downwards fall due to increased gravity and drive the ends, away from the connecting rods, of the dirt blocking rods to be upwards lifted, leaves, plastic bags, paper scraps, mudstones and the like on the strip-shaped water draining holes are jacked up, blockage of the strip-shaped water draining holes is avoided, and the pluggingpreventing sewer cover plate is low in cost and better in effect.

The invention relates to a printing ink box nozzle antiblocking device. The printing ink box nozzle antiblocking device comprises a baffle, an antiblocking block, a push rod, an air cylinder and a controller, all of which are fixed to a nozzle. The baffle comprises a connecting plate, a reset plate and a guide plate, wherein the connecting plate is fixed to the nozzle; the upper end of the reset plate is fixedly connected with the connecting plate, and the lower end of the reset plate is fixedly connected with the guide plate; the reset plate is fixedly provided with a spring connected with the antiblocking block; and the guide plate is provided with a guide sliding groove and a first through hole aligned at the nozzle. The antiblocking block is arranged in the guide sliding groove and is sequentially provided with a closed cavity, a second through hole, a guide cavity and a sliding block cavity, wherein a sponge is arranged in the closed cavity, the guide cavity is provided with a through guide groove corresponding to the push rod, and the sliding block cavity is provided with a slope. The air cylinder is in transmission connection with the push rod. The lower end of the push rod makes contact with the slope of the sliding block cavity. The controller is arranged on the nozzle and fixedly connected with the air cylinder. The printing ink box nozzle antiblocking device is simple and reasonable in structure, convenient to operate and capable of effectively preventing the nozzle from being blocked.

The invention discloses an anti-blocking impounding reservoir for water conservancy projects. The anti-blocking impounding reservoir comprises an impounding reservoir body arranged on the ground, a filtering breast board is fixedly connected to the top of the impounding reservoir body, an installing hole is formed in the left side of the top of the filtering breast board, a sealing cover is inserted into the installing hole, the interior of the impounding reservoir body is fixedly connected with a water outlet pipe extending to the exterior of the impounding reservoir body, the bottom of the water outlet pipe is fixedly connected with a filtering net, a transverse plate is fixedly connected to the left side face of the water outlet pipe, a sliding hole is formed in the top of the transverse plate, a scrapping plate is in sliding connection to the interior of the sliding hole, a horizontal plate which extends to the upper portion of the transverse plate is fixedly connected to the top of the scrapping plate, and vertical springs are fixedly connected to the bottoms of the two ends of the horizontal plate. The anti-blocking impounding reservoir for the water conservancy projects is better in anti-blocking effect, the water conservancy projects can be completed more smoothly, and the water outlet pipe cannot be blocked during water pumping.

The invention belongs to the technical field of fluid control valves and relates to a valve suitable for adjustably cutting of steam in a high-temperature high-pressure steam working condition, in particular to a pilot operated serial adjusted stop valve. The pilot operated serial adjusted stop valve comprises an upper cover and a valve body, wherein the middle head of the valve body is in fastening connection to the upper cover, and a main valve element and a valve seat are arranged in the inner cavity of the valve body; a guide sleeve is arranged in the inner cavity of the middle head of thevalve body, and a guide ring and a supporting ring are arranged between the guide sleeve and the main valve element; a balancing hole is formed in the main valve element, the lower end of the main valve element is in hermetic contact with the valve seat, the main valve element is hermetically connected to a piloted operated valve element assembly through a thrust ring, and a reset spring and a spring seat are arranged between the main valve element and the pilot operated valve element assembly. The stop valve provided by the invention has the advantages of being excellent in sealing propertyand adjusting property, good in dynamic stability, hard to lock, good in erosion resistance, long in service life, low in noise and the like, and the valve can copy with adjusting and cutting off working conditions of steam at high temperatures (greater than or equal to 290 DEG C) with a high pressure difference (greater than or equal to 3MPa) effectively as a result of an excellent comprehensiveperformance.

The invention relates to an anti-clogging sampling structure and a sampling probe with the same and a sampling system with the sampling probe. According to the anti-clogging sampling structure, an elastic device is arranged in an anti-clogging sampling channel, a puncture head is connected to one end of the elastic device, and the other end of the elastic device is always in an inner tube during the sampling process. A certain space always exists between the elastic device and the inner wall of an outer tube to prevent the size of tissue adsorbed into the anti-clogging sampling channel duringthe sampling process from exceeding the size of the anti-clogging sampling channel, so that the anti-clogging effect is achieved. The anti-clogging sampling structure further includes two fluid flow channels, the two fluid flow channels are disposed at both ends of a sampling tank, and the tissue is fixed by negative pressure suction. The anti-clogging sampling structure and the sampling probe with the same and the sampling system with the sampling probe have the beneficial effects that through the arrangement of the elastic device and the two fluid flow channels, the anti-clogging performanceof the channel is effectively improved, the integrity of tissue cutting is ensured, the functions of tissue adsorption, rotary cutting sampling, and surgical site irrigation are combined together, and the one-time success rate of a surgery is improved.

The invention provides two technical schemes of a beating sleeve for a cantilever screen. In the first scheme, the beating sleeve comprises a cylindrical barrel-shaped beating sleeve body, a spiral projected table is arranged on the outer surface of the beating sleeve body, or a fixed spiral spring is arranged on the outer surface of the beating sleeve body. In the second scheme, the beating sleeve body of the beating sleeve is a cylindrical spiral body. Through the two structures, the outer surface of the beating sleeve is changed into the unsmooth cylindrical surface with height variations, and the stress of two adjacent screen strips can be different when the cylindrical surface beats on the screen strips, so the two screen strips have different vibration and unequal amplitudes, materials blocked between the two screen strips are favorably removed, and the blocking prevention effect is improved.

The invention relates to a precision-grinding cork emery cloth for grinding and polishing metals, in particular to a precision-grinding sanding cloth. The precision-grinding cork emery cloth is prepared by the following processing steps: 1, unwinding; 2, impregnation; 3, coating; 4, calendering and stereotyping; 5, winding; 6, unwinding and printing trademarks; 7, gluing primer; 8, planting emery under the vibration of gravity cork particles; 9, pre-drying; 10, coating glue and grinding; 11, main drying; 12, winding; 13, unwinding; 14, coating the glue; 15, main drying; 16, curing; 17, curving; 18, bundling; and 19, storing. The precision-grinding cork emery cloth has the characteristics of water proofing, good grinding and polishing performance, strong anti-blocking capacity and the like, is particularly prominent in maintaining consistent surface finish and the like, and is suitable for high speed grinding needing cooling water.

The invention discloses an anti-clogging pipeline used for discharging salt, belonging to the technical field of salt discharging in a saline-alkali land. The anti-clogging pipeline comprises a salt-discharging main pipeline, wherein the top part and the bottom part of the salt-discharging main pipeline are respectively provided with pipeline connectors; the top part of each pipeline connector located at the top part of the salt-discharging main pipeline and the bottom part of each pipeline connector located at the bottom part of the salt-discharging main pipeline are respectively provided with a pipeline socket; the top part of each pipeline socket located at the top part of each pipeline connector and the bottom part of each pipeline socket located at the bottom part of each pipeline connector are respectively provided with a salt-discharging branch pipeline; the inner cavity of each pipeline socket is provided with an anti-clogging filtering device; water-permeable holes are arranged on the pipe wall of each salt-discharging branch pipeline; and the outer wall of each salt-discharging branch pipeline is provided with a water-permeable film. The anti-clogging pipeline provided by the invention has the advantages of simple structure, reasonable design, high practicality, convenient use, continuous salt-discharging and alkali-reducing effects, short treatment cycle, low price, low cost, strong salt-discharging ability, good anti-clogging performance, characteristics of high strength and corrosion resistance, long service life, and extensive market prospects.

The invention discloses a siltation-preventing water intake facility achieving automatic flood prevention and pollution discharge. The siltation-preventing water intake facility comprises a sand flushing slope, an overflow dam, a water collection groove and a setting basin. The sand flushing slope is arranged between connected mountains. A flood-preventing dam is arranged on the left side of the sand flushing slope, the overflow dam is arranged on the right side of the sand flushing slope, a sand turning nozzle is arranged between the sand flushing slope and the flood-preventing dam, the water collection groove is formed in the sand flushing slope in the water flow direction and matched with the sand flushing slope in a bearing mode, an overflow slope is arranged in the direction, parallel to the sand flushing slope, of the water collection groove, the right side of the water collection groove is provided with the overflow dam, the left side of the water collection groove is led to a residue filter bed, the residue filter bed is provided with an overflow groove in the water flow direction and matched with the overflow groove in a bearing mode, a water stop dam is arranged at the front end of the overflow groove, the overflow groove is connected with the setting basin, and the setting basin is provided with a water intake gate and a sand discharge gate. The water intake problems of a mountain river hydropower station, a tap water plant and farm irrigation are fundamentally solved, and the purposes that siltation and blockage are never caused on a water intake dam in the flood period, and natural water intake is achieved in the drought period are achieved.