482results about How to "Effective interception" patented technology

The invention provides a wafer defect detection method and device, and belongs to the technical field of semiconductor manufacturing. The wafer defect detection method comprises the steps that defect boundary extraction is carried out on a wafer to be judged, and morphology information of defects of the wafer is determined, and the morphology information comprises the number of breakpoints, defect distribution density and the length and angle of each section of defect; generating a defect density matrix comprising a plurality of feature vectors according to the morphology information, wherein the defect density matrix is used for representing the density change and breakpoint distribution condition of defects; evaluating the defect density matrix by using a defect judgment model to obtain a risk score of the wafer; and comparing the risk score of the wafer with a preset risk threshold value, and judging the wafer of which the risk score is greater than the risk threshold value as the wafer with discontinuous Special pattern defects. According to the method and the device, the wafer with discontinuous Special pattern defects can be identified.

The invention discloses a system and a method for resisting a pseudo link layer protocol attack in an electric power communication network, and relates to the technical field of communication. The system comprises: a switching unit, which is used for receiving all data frames transmitted from an Ethernet port; the data identification module analyzes the protocol type and the destination address of the data frame, and forwards the data frame to the service processing unit or directly discards the data frame; the buffer area module sets an independent buffer area for each link layer protocol, and dynamically adjusts the size of the buffer area based on the protocol characteristic weight and the equipment memory resource through the configuration unit; the buffer area management module monitors the state of a buffer area in real time and triggers data discarding operation when the buffer area is fully loaded; and the data extraction module extracts the data frames from the buffer area according to a set time interval and analyzes and forwards the data frames in combination with a priority rule. According to the method, the size and the time interval of the buffer area can be dynamically adjusted, the resource utilization efficiency is improved, the pseudo link layer protocol attack is effectively resisted, and the security and the real-time performance of an electric power communication network are guaranteed.

The invention discloses a red sandstone foundation pit drainage structure and a construction method thereof, and relates to the technical field of foundation pit drainage, the red sandstone foundation pit drainage structure comprises a buoyancy assembly, a water suction pump, an electromagnetic three-way valve and two sediment filtering assemblies, and the two sediment filtering assemblies are controlled by the electromagnetic three-way valve to alternately work; the silt filtering assembly in a working state is used for filtering silt, and the silt filtering assembly in an idle state is used for precipitating and collecting the intercepted silt. Alternate work of the two sediment filtering assemblies is achieved through the electromagnetic three-way valve, drainage continuity is guaranteed, the idle time of the sediment filtering assemblies is effectively utilized for sediment collection, and the situation that efficiency is reduced due to frequent cleaning of a traditional single filtering system is avoided; and the cleaned silt is independently collected, and does not enter the raw water body to cause the increase of the silt concentration and influence the subsequent drainage.

The utility model discloses a material receiving device with a centered belt, which belongs to the technical field of ferrous metallurgy and comprises a material receiving hopper positioned right above a material receiving belt, the upper end of the material receiving hopper is provided with a material inlet, and the lower end of the material receiving hopper is provided with a material outlet; the material receiving hopper is characterized in that an inner cavity channel of the material receiving hopper is of a rectangular structure; a plurality of buffer plates are arranged in an inner cavity of the receiving hopper; the included angle between the buffer plate and the horizontal plane is not equal to 0 degree and 90 degrees; the buffer plates comprise a plurality of left wall buffer plates arranged on the left side wall of the inner cavity at different heights and a plurality of right wall buffer plates arranged on the right side wall of the inner cavity at different heights; the receiving hopper with the buffer plate is arranged, and the problems that in the prior art, when large-particle materials fall, impact on the receiving hopper is large, abrasion is prone to occurring, and noise is generated are solved; materials directly impact a material receiving belt, so that deviation and other potential safety hazards are caused; and the receiving hopper lacks the capability of intercepting large materials, so that the belt may be scratched, and the maintenance cost is increased.

The utility model relates to the technical field of municipal engineering, and provides an interception protection device which comprises an interception frame. And the supporting rods are installed on the intercepting frame, the supporting rods are arranged towards the inner wall of the well chamber, and the length of the supporting rods can be adjusted relative to the inner wall of the well chamber so that the intercepting frame can be assembled in the well chambers with different calibers. The intercepting frame can be assembled in well chambers with different calibers by adjusting the lengths of the supporting rods, and the supporting rods can be completely assembled in place with the inner walls of the well chambers by adjusting the lengths of the supporting rods, so that the inner walls of the well chambers can be clamped, operators about to rush into downstream pipelines are effectively intercepted, and the working efficiency is improved. Therefore, the life safety of operators is greatly guaranteed.

The invention discloses a casting pouring system which comprises a casting platform, a rail placed on one side of the casting platform, a motor, air pumps arranged at the two ends of the casting platform and a control console used for controlling equipment operation, the control console is in telecommunication connection with the air pumps and the rail, a casting mechanism is arranged on one side of the casting platform, and the casting mechanism comprises a nut sleeve. The nut sleeve is movably connected with a transmission mechanism used for transmission, the transmission mechanism comprises a threaded rod, and the threaded rod is movably connected with three mold mechanisms used for casting. The bottom of a cover plate of the slag filtering mechanism is connected with a protection plate through a rotating shaft, when inert gas is blown into the casting ladle, gas blows a half-moon plate to drive the protection plate to rotate, an arc plate unidirectionally blocks molten slag under the action of a spring, the molten slag is effectively intercepted in the flowing process of molten metal, the problem that in existing equipment, the molten slag is difficult to separate from the molten metal is solved, and the service life of the molten slag is prolonged. The slag inclusion defect formed in the casting is avoided, and the mechanical property and the quality stability of the casting are improved.

The invention belongs to the technical field of breed duck feed production, and particularly relates to a breed duck feed production wet feed crusher which comprises a barrel body, a feeding hopper is arranged at the upper end of the barrel body, supporting legs are fixedly connected to the lower portion of the barrel body, a discharging opening is formed in the barrel body, and a crushing device and a screening device are arranged on the barrel body. And a feeding device is arranged on the side edge of the barrel body. According to the wet material crusher for breeding duck feed production, a crushing cutter is driven by a first motor to rotate, breeding duck feed is rapidly and evenly crushed, then the crushed feed falls into a conical filter screen to be screened, large-particle impurities are effectively removed, large particles obtained after screening are conveyed through an auger, the feed is fed into a feeding pipe, and the feeding pipe is used for feeding the breeding duck feed. And then the feed is conveyed into the barrel body through the feeding pipe, so that the crushing cutter performs secondary crushing on the large-particle feed, the secondary crushing mechanism ensures the uniformity and consistency of the feed particles, and the overall crushing quality is remarkably improved.

The utility model discloses an oil-water separator with a filtering device, and relates to the field of oil-water separation equipment, the oil-water separator comprises a separation mechanism and a sedimentation mechanism, the separation mechanism comprises a treatment box, the oil-water separator is provided with an aeration mechanism, a water inlet bin receives and temporarily stores an oil-water mixture, it is ensured that the oil-water mixture uniformly flows into a subsequent separation bin, and the oil-water separation efficiency is improved. An aeration mechanism is arranged at the bottom of a partition plate of a water inlet bin, when gas is injected through an aeration opening, a large number of tiny bubbles are generated, the bubbles make contact with an oil-water mixture in the rising process, and the oil-water separation effect is improved. According to the present invention, the gas is introduced into the water inlet chamber, the adhesion action is utilized to carry tiny oil drops to float, such that the oil drop separation is accelerated, the separation time is shortened, the aeration mechanism ensures that the gas is uniformly dispersed in the water inlet chamber, and especially the wedge-shaped surface increases the contact area of the gas and the mixture, and improves the oil drop capturing efficiency.

The utility model discloses a driving type hydraulic oil cylinder, which relates to the technical field of hydraulic oil cylinders and comprises a hydraulic oil cylinder main body, a filtering component and a buffering component, the filtering assembly comprises a mounting seat, an oil pump main body, an oil outlet pipe, a filtering seat, a mounting block, a first threaded bolt, a filtering cavity, a limiting plate, a first filtering net, a second threaded bolt and a second filtering net, the mounting seat is mounted at the right end of the hydraulic oil cylinder main body, the oil pump main body is mounted at the upper end of the inner wall of the mounting seat, and the oil outlet pipe is mounted at the left end of the oil pump main body. When hydraulic oil returns to the oil pump body through the oil outlet pipe, the hydraulic oil is filtered through the second filter screen and the first filter screen in the filter cavity and then injected into the oil pump body again, impurities, particles and pollutants in the hydraulic oil can be effectively intercepted and removed, and stable operation of a system is ensured; and faults or abnormities caused by pollution are reduced.

A sundry blocking and collecting device comprises a sundry collecting assembly installed on a dust removal pipeline, the sundry collecting assembly comprises a sundry collector, and a first pneumatic valve connected with the dust removal pipeline is installed on a dusty air inlet of the sundry collector; a second pneumatic valve connected with the dust removal pipeline is mounted on the dusty air outlet; an impurity outlet is formed in the end close to the dust-containing air inlet; the impurity outlet is connected with a filter material barrel, and an impurity inlet of the filter material barrel is provided with a third pneumatic valve; a fourth pneumatic valve is mounted at an impurity outlet of the filter drum; an air cannon blowback inlet is formed in the end close to the dusty air outlet, an air cannon blowback valve is installed on the air cannon blowback inlet, and the air cannon blowback valve is connected with an air cannon; and a sundry blocking component is arranged below the air cannon reverse blowing inlet in the sundry collector. According to the utility model, the impurities in the raw material ore in the mine production process are effectively intercepted and collected, the performance of the dust remover is improved, the service life of the dust remover is prolonged, the maintenance cost is reduced, the environmental pollution is reduced, and the dust remover has obvious environmental protection benefits.

The utility model belongs to the technical field of butterfly valves, and particularly relates to an anti-sediment butterfly valve which comprises a valve body, a water inlet and a water outlet are formed in the left side and the right side of the valve body respectively. The valve rod is fixedly connected with a valve core; the handle is fixedly connected with the valve rod; the silt prevention mechanism comprises a motor, a threaded rod, a threaded sleeve, a cleaning brush and a filter screen, the filter screen is arranged at the water inlet of the valve body, the output end of the motor is fixedly connected with the threaded rod, the threaded rod is arranged on the left side of the filter screen, the surface of the threaded rod is in threaded connection with the threaded sleeve, and the cleaning brush is fixedly connected to the right side of the threaded sleeve; the cleaning brush abuts against the filter screen; according to the sediment-preventing butterfly valve, the filter screen is arranged at the water inlet, sediment can be effectively intercepted and prevented from entering the valve body, the motor drives the threaded rod to rotate, the threaded sleeve moves along the threaded rod, the cleaning brush is driven to clean the filter screen, and the sediment is effectively prevented from blocking the filter screen.

The invention discloses a switch cabinet and a pressure relief device and method thereof, the pressure relief device comprises a pressure relief channel, a cover plate, a gauze element, an elastic connecting piece and an arc blocking assembly, the cover plate is arranged on the pressure relief channel, the first side of the cover plate is hinged to a side plate of the pressure relief channel, and the gauze element is fixed on the cover plate; one end of each elastic connecting piece is fixed on the cover plate, and the other end of each elastic connecting piece is connected with a side plate of the pressure relief channel through a fixing block; each arc blocking assembly is located in the corresponding pressure relief channel and comprises an arc blocking plate, an elastic piece and a supporting frame. At least one end of the supporting frame is fixed to a side plate of the pressure relief channel, the arc blocking plate is movably installed below the supporting frame through the guide column, and the elastic piece is arranged on the guide column in a sleeving mode and located between the supporting frame and the arc blocking plate. And a plurality of through holes are formed in the arc baffle. Pressure accumulation in the cabinet body is avoided, and damage of impact energy sprayed out of the cabinet body to the environment outside the cabinet body is reduced.

The invention discloses an aqueous solution production and preparation device and method based on glyphosate mother liquor purification treatment, and belongs to the technical field of glyphosate mother liquor treatment. The water aqua production and preparation device based on glyphosate mother liquor purification treatment comprises a combustion box and an evaporation box, a transfer sleeve is arranged between the combustion box and the evaporation box, the transfer sleeve is connected with the combustion box and the evaporation box through flanges, a liquid storage box is arranged at one end of the combustion box, and a booster pump assembly is arranged on one side of the liquid storage box. In order to solve the problems that when an existing mother solution is subjected to innocent treatment through an incineration method, the mother solution cannot be completely decomposed once components are not combusted or the combustion temperature is not high enough, and the incineration cost is high due to the fact that a large amount of fuel needs to be consumed, the number of combustion chambers is reduced through a tower type design; evaporation and combustion operations are completed through a single combustion chamber, so that the consumption of fuel gas can be effectively reduced, and the cost is saved.

The present application relates to the technical field of separation devices, and proposes a gas-liquid separator, including a separation tower body, wherein the top and bottom of the separation tower body are respectively provided with an air outlet pipe and a liquid outlet pipe, wherein the inner cavity of the separation tower body is sequentially installed with a cyclone and an adsorption part from bottom to top, and the inner cavity of the separation tower body is also provided with a liquid retaining assembly, wherein the liquid retaining assembly is located between the cyclone and the adsorption part, and the liquid retaining assembly comprises a first liquid retaining plate coaxially supported in the inner cavity of the separation tower body, wherein a plurality of first air holes are evenly opened on the first liquid retaining plate. The present application has the effect of reducing the corrosive droplets carried in the exhaust gas discharged from the air outlet pipe at the top of the separation tower body.

The invention relates to the technical field of textile fabrics, and discloses a textile fabric cutting device for textile production, which comprises a supporting table, a control table is fixedly mounted on the front surface of the supporting table, a supporting plate is fixedly mounted at the top of the supporting table, and a guide rotating drum is arranged on the inner side of the supporting plate. And a rotating shaft movably penetrates through one side of the guide rotating cylinder, the rotating shaft is fixedly installed on the inner wall of the supporting plate, and the outer wall of the rotating shaft is movably sleeved with the guide rotating cylinder. A clamping cutting part is arranged, a spring and a sliding rod structure are adopted, a clamping plate can flexibly adapt to textile fabrics with different thicknesses, friction force is increased through a rubber pad, it is ensured that the fabrics are kept stable and do not move in the cutting process, meanwhile, a hydraulic cylinder drives a cutting blade to conduct precise cutting, and the cutting efficiency is improved. And the pressing limiting block further ensures the cutting accuracy and stability, and the effects of improving the cutting efficiency and ensuring the flatness and precision of the cut edge are achieved.

The utility model discloses an optical imaging lens, the optical imaging lens comprises a lens barrel, a lens group and a plurality of spacing elements, the lens group and the spacing elements are arranged in the lens barrel, the lens group comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens in sequence from an object side to an image side along an optical axis, a spacing distance is formed between any two adjacent lenses; the plurality of spacing elements comprise a sixth spacing element which is arranged on the image side of the sixth lens and is at least partially contacted with the image side surface of the sixth lens; wherein the central thickness CT6 of the sixth lens on the optical axis and the central thickness CT5 of the fifth lens on the optical axis meet the following conditions: 0.1 lt; cT6 / CT5 is less than 0.6; the effective focal length f6 of the sixth lens and the curvature radius R11 of the object side surface of the sixth lens meet the formula:-1lt; r1 / f6lt; R1 / f6lt; 1; and the inner diameter d6m of the image side surface of the sixth spacing element and the outer diameter D6m of the image side surface of the sixth spacing element satisfy: 0 lt; (D6m-d6m) / (D6m + d6m) lt; and 0.2 part.

The utility model discloses rotary evaporation and concentration equipment for liquid fertilizer. The rotary evaporation and concentration equipment comprises a shell, a differential stirring mechanism and a vacuum pump mechanism, the shell comprises a cushioning outer shell, a motor arranged at the bottom of the inner wall of the cushioning outer shell and a rotating barrel arranged over the motor. An upper cover is arranged above the cushioning shell; the motor is fixedly connected with the cushioning shell; the differential stirring mechanism comprises a planetary gear set arranged at the bottom of the inner wall of the rotating barrel and a rotating sleeve arranged on the planetary gear set; a plurality of brackets are arranged on the rotating sleeve, and rotating fan blades are arranged on the brackets; the vacuum pump mechanism comprises an air guide pipe arranged on the upper cover and a vacuum pump arranged at the other end of the air guide pipe; a heating unit is arranged in the cushioning shell and fixedly connected with the cushioning shell. By adopting the unique differential rotation design, the stirring and concentrating efficiency is improved, and the uniformity and stability of liquid in the concentrating process are ensured.

The utility model discloses a waterproof water guide groove for a building roof for building integrated photovoltaics (BIPV). The photovoltaic panel groove comprises a groove body, the groove body is arranged at a gap between every two adjacent photovoltaic panels, and the middle part of the groove body extends upwards to form a convex part; the groove body is divided into two water collecting grooves by the protruding part, and a plurality of drainage grooves are distributed in the water collecting grooves. A filter screen is fixedly arranged at the bottom of the drainage groove; a water collecting chamber is fixedly arranged at the bottom of the tank body; the gradient on the two sides of the protruding part accelerates the drainage speed of water flow, and therefore the drainage efficiency is improved. Due to the fact that the protruding part is arranged, a relatively high area is formed in the middle of the groove body, water flow can flow towards the two sides more easily, and accumulated water is prevented from being formed in the middle. The potential damage of moisture to the building and the photovoltaic panel is reduced, and meanwhile, the drying and cleaning of the tank body are kept; and the direction and the speed of water flow are changed through the protruding parts, impurities and particles can be precipitated in the water collecting chamber more easily, and therefore cleaning work is more convenient and efficient.

The invention relates to the technical field of material screening and cleaning, in particular to a swing type material screening and cleaning device. According to the technical scheme, the vibrating screen comprises a screen drum, a supporting frame, a bottom plate and a second motor, a first screen, a second screen and a third screen which are connected in a sleeved mode layer by layer and are in an inclined cylindrical shape are arranged in the screen drum, rotating seats which are symmetrically distributed are arranged at the upper end of the supporting frame, and the outer wall of the screen drum is connected with rotating rings rotationally installed in the rotating seats in a sleeved mode; the outer wall of the screen drum is sleeved with a gear ring, a first motor is fixedly arranged on one side of the upper portion of the supporting frame, and a gear meshed with the gear ring is arranged at the output end of the first motor. The screening structure is installed in the screen drum, sputtering of materials is avoided, meanwhile, multi-stage screening of the materials and classified use of refined materials are conducted, the screening structure rotates in the screening process, the blocking risk is reduced, and the use stability of the screening structure is improved.

The utility model discloses a wastewater treatment mechanism capable of preventing environmental pollution, and relates to the technical field of environmental engineering. The device comprises a treatment frame, one side of the bottom end of the treatment frame is communicated with a liquid outlet pipe, a matched valve is fixedly mounted on the liquid outlet pipe, a matched filter disc is fixedly inserted into one end, close to the treatment frame, of the liquid outlet pipe, and a separation mechanism is fixedly mounted at the upper end of one side of the treatment frame. The inner side of the treatment frame is provided with a mixing mechanism which is matched for use; through the arrangement and use of the separation mechanism, large-particle impurities in wastewater can be effectively intercepted, and after interception is carried out for a period of time, the separation net barrel intercepting the large-particle impurities can be rotated to a state that an opening is inclined downwards, and the other separation net barrel is rotated to the uppermost end; and therefore, a user can conveniently and effectively clean large-particle impurities intercepted in the corresponding separation net cylinder, and synchronous implementation of separation net cylinder cleaning and wastewater filtering operation is realized, so that the wastewater treatment efficiency is effectively improved.

The invention relates to the field of sewage filtering equipment, and discloses a sewage filtering device and method for a building construction site, the sewage filtering device comprises a first underframe, a second underframe on the right side of the first underframe, and a third underframe on the left side of the first underframe, the upper end of the first underframe is fixedly connected with a sedimentation tank, and the upper end of the sedimentation tank is fixedly connected with a coarse filtering tank. According to the sewage filtering device and method for the building construction site, by arranging multi-stage treatment structures such as the coarse filter tank, the sedimentation tank, the oil-water separation tank, the fine filter and the disinfection tank, pollutants of different types and particle sizes in sewage of the building construction site can be gradually removed; a filter grating, a first filter screen and a second filter screen in the coarse filter tank can effectively intercept impurity particles from large to small, a shell bottom and a spoiler of the sedimentation tank can efficiently settle heavy particles such as silt, and a plurality of filter layers with different particle sizes and materials in the fine filter can further remove residual fine particles and soluble pollutants. The overall filtering quality of the sewage is obviously improved.

This invention relates to the field of pulverized coal conveying and dust removal technology, specifically to a pulverized coal dust removal method, comprising: S1: Constructing a dust removal system: setting up a dust cover on a conveyor belt, setting up a pressure-reducing chamber on the dust cover, installing wear-resistant baffles at the bottom of the dust cover, and installing a dust curtain inside the dust cover; installing a dust collector at the top of the dust cover; S2: Coal conveying and primary dust removal: starting the conveyor belt to transport coal, the coal falls onto the conveyor belt, and the generated dust-laden gas forms a local high-pressure zone under the obstruction of the dust curtain, causing a portion of the dust-laden gas to undergo primary filtration through the filter components on the pressure-reducing chamber; S3: Secondary dust removal: the remaining dust-laden gas in the dust cover is sucked into the dust collector, the dust-laden gas enters below the liquid surface of the dust collector, causing the pulverized coal particles to settle and form coal slurry, which is then transported outside the dust collector, and the purified gas is discharged through the outlet. This method achieves closed-loop control of the entire process from source dust suppression to end-of-pipe treatment through two-stage synergistic dust removal, improving the dust removal effect.

The utility model relates to the technical field of chemical reagent experiments, in particular to a flask with an explosion-proof function, which comprises a safety plug, the bottom end of the safety plug vertically penetrates through an opening at the top end of a thin bottle neck, a ball bottle body is arranged at the bottom end of the thin bottle neck, and a pressure relief through pipe is arranged on the outer wall of one side of the ball bottle body. And a pressure relief valve obliquely penetrates through the interior of the pressure relief through pipe, one side of the outer portion of the ball bottle body is sleeved with a first protective net sleeve, and one side of the first protective net sleeve is connected with a second protective net sleeve in an adsorption mode. According to the improved flask and the safety plug, automatic pressure adjustment is achieved, a controllable pressure relief channel is formed, the sealing performance and the safety are balanced, the relative positions of the pressure relief valve and the pressure relief hole are changed, high-pressure gas can be conveniently diffused and discharged in a fan shape through the pressure relief hole, the impact force and danger of gas injection are reduced, meanwhile, the pressure relief valve has a reset mechanism, and the safety performance is improved. The first protective net sleeve and the second protective net sleeve can effectively intercept large glass fragments generated when the bottle body is broken, and the large glass fragments are prevented from splashing to hurt people.

The utility model relates to an anti-ice-falling device for the surface of a cross tie beam of a bridge tower, which comprises a plurality of anti-ice-falling devices arranged on the surface of the cross tie beam, each anti-ice-falling device comprises an anti-ice-falling clamp, a plurality of raised fixing pieces and a plurality of extended connecting pieces, and the anti-ice-falling clamps comprise a first anti-ice-falling clamp and a second anti-ice-falling clamp. The first anti-ice-falling clamp and the second anti-ice-falling clamp are fixedly arranged on the edges of the left side and the right side of the cross tie beam respectively, and the first anti-ice-falling clamp and the second anti-ice-falling clamp are connected into a whole through the extending connecting pieces and the protruding fixing pieces and fixed to the upper surface of the cross tie beam. The limiting baffles arranged at certain intervals prevent solid accumulated ice from sliding on the upper surface of the bridge tower cross tie beam, meanwhile, lateral drainage of the upper surface of the cross tie beam cannot be hindered, the phenomenon that a traditional drainage channel becomes a'water blocking channel 'due to icing is avoided, and the size of a single block of ice accumulated on the upper surface of the cross tie beam is limited within a safety threshold value as much as possible.

The utility model discloses a wheat-steeping ventilation overflow wheat-water separation water-saving device, which relates to the technical field of beer manufacturing equipment and comprises a wheat-steeping tank body, a separation component and a blanking groove body, a protection plate is arranged on the wheat steeping tank body, connecting frames are arranged on the inner wall of the protection plate, the connecting frames are evenly distributed in the circumferential direction with the protection plate as the circle center, the number of the connecting frames is multiple sets, and mounting rings are arranged between the multiple sets of connecting frames; the separation assembly is arranged on the barley steeping tank body and is used for separating barley from barley water in a use state; and the blanking groove body is arranged on the wheat steeping tank body. According to the utility model, the separation assembly is arranged, so that solid particles such as barley can be effectively intercepted in the barley steeping tank body in the overflow process and are prevented from flowing out along with water, more thorough wheat-water separation can be realized, and the separation efficiency is improved; and fluid dynamic characteristics in the wheat steeping tank body can be optimized, so that water flow is smoother, and meanwhile, the possibility that wheat is brought out by the water flow is reduced.

The present application relates to a backwash water and air distribution filter brick and a water and air distribution device for a sulfur autotrophic denitrification filter tank, and relates to the technical field of sewage treatment equipment. The backwash water and air distribution filter brick for the sulfur autotrophic denitrification filter tank in the present application includes a bottom plate, a first side plate, a second side plate and a partition plate, forming a primary distribution chamber for backwash water, a secondary distribution chamber for backwash water and a secondary distribution chamber for backwash air, and realizing uniform water and air distribution through multiple through holes and a secondary particle retention component. The present application also provides a backwash water and air distribution device comprising the above-mentioned backwash water and air distribution filter brick. The structural design in the present application reduces the loss of sulfur autotrophic slow-release materials, reduces the risk of filter brick clogging, improves backwash efficiency, and at the same time reduces the construction depth of the filter tank, saving investment.

This invention relates to the field of fine chemical technology, specifically disclosing a production process for electronic-grade diethyl carbonate. The method includes the following steps: ethylene carbonate and anhydrous ethanol undergo a transesterification reaction in a microwave reactor catalyzed by a composite catalyst; the reaction solution is then subjected to phase separation treatment, followed by a continuous separation process coupling atmospheric and vacuum distillation to obtain an intermediate; further purification is achieved by molecular sieve adsorption to remove metal impurities and moisture, combined with precision filtration using a polytetrafluoroethylene membrane. The composite catalyst significantly improves the transesterification reaction efficiency and product selectivity. This process, through the synergistic effect of reaction process enhancement and multi-stage purification technology, achieves highly efficient removal of moisture, metal impurities, and nanoscale particles from the reaction system. The resulting electronic-grade diethyl carbonate meets the stringent requirements of high-end electronic chemicals such as lithium battery electrolytes, and possesses technical advantages such as short reaction cycle, thorough impurity removal, and high product purity.

The utility model relates to the technical field of oil extraction, in particular to an efficient temporary plugging anti-overflow device. Comprising an upper connector, the upper connector is fixedly and hermetically connected with a valve connector, the lower end of the valve connector is fixedly and hermetically connected with a filter pipe and an outer cylinder, the filter pipe is located on the inner side of the outer cylinder, the valve connector is provided with an air hole communicated with an annular cavity between the outer cylinder and the filter pipe, and a check valve is installed in the air hole; the lower end of the filter pipe is fixedly and hermetically connected with a lower pipe located inside the outer cylinder, the lower end of the lower pipe is blocked and fixedly connected with the lower end of the outer cylinder through a lower connector, and a temporary blocking plate is detachably, fixedly and hermetically connected into the lower connector. Through soluble temporary plugging, multi-stage filtering, gas-liquid separation and modular sealing design, the device has the core advantages of efficient overflow prevention, rapid production, airlock prevention, low maintenance cost and the like, has both environmental protection property and economical efficiency, and is suitable for oil well operation under complex working conditions.

This utility model provides a welding fume purification and collection device for metal products. The device includes a housing, a filter assembly, a pipe body, an air inlet hood, and a pre-filtration mechanism. The filter assembly, housed within the housing, includes a fan, a filter element, and a telescopic pipe. The fan's input end is connected to the filter element, and the other end of the filter element is connected to the telescopic pipe, which communicates with the pipe body. The pre-filtration mechanism is located within the telescopic pipe. This device relates to the field of welding fume treatment. By incorporating a pre-filtration mechanism within the telescopic pipe, this utility model effectively filters and intercepts large-sized impurities carried in the welding fume before it enters the filter element, preventing these impurities from directly entering the filter element. This significantly reduces the risk of filter element clogging and damage, extends the filter element's service life, and reduces maintenance and replacement costs.

The utility model belongs to the technical field of waste heat utilization equipment, and particularly relates to a waste heat boiler which comprises a waste heat boiler body and supporting legs, a waste heat recovery structure is arranged above the waste heat boiler body and comprises a filtering mechanism and a recovery mechanism, and the filtering mechanism comprises a supporting plate, a gas guide pipe, an installation plate, a fixing plate and a rotating rod. The top of the supporting plate is connected with the bottom of the recycling box, one end of the waste heat boiler communicates with one end of the gas guide pipe, and the two ends of the mounting plate are connected with the inner wall of the recycling box. According to the waste heat boiler, after flue gas enters the recycling bin, the flow speed is reduced, the retention time is prolonged, the filter screen can effectively intercept solid impurities in the flue gas, pollutant emission is reduced, environmental pollution is avoided, impurities accumulated on the surface of the filter screen can be automatically removed, blocking is prevented, and the filtering efficiency is maintained; and meanwhile, the filter screen can be quickly and conveniently disassembled and assembled, and the working efficiency of the waste heat boiler is improved.