34 results about "Corrosive chemical" patented technology

The invention provides an anti-shaking honeycomb structure device with an array heterogeneous wettability boundary and application, a large number of regularly arranged honeycomb anti-shaking units are spliced to form an array platform, and the surface of the inner wall of each anti-shaking unit is processed into a uniformly distributed zigzag notch structure; a plurality of groups of heterogeneous wettability areas are arranged on the surfaces of the sawtooth-shaped notch structures at intervals in the height direction, a shaking liquid level is changed into a calm liquid level after flowing through the shaking-restraining honeycomb structure device, and in the process, the inner wall of each shaking-restraining unit in the shaking-restraining honeycomb structure device is provided with a specially-designed array type heterogeneous wettability boundary and a microstructure; pinning-cutting-dissipation of liquid shaking is achieved through the synergistic effect, and therefore the liquid stabilizing effect on the shaking liquid level is achieved. The device can be applied to the oscillation suppression of propellants of aircraft fuel tanks, the oscillation suppression of corrosive chemicals in the transportation process of chemical storage tanks and ballast tanks of marine floating platforms, the liquid level amplitude and the impact pressure peak value on the tank wall can be greatly reduced, and the load of the tank body structure is not increased.

The utility model relates to the technical field of pipes, and discloses a corrosion-resistant nickel alloy pipe which comprises a pipe body, and installation plates are installed at the two ends of the pipe body. A nickel alloy layer is arranged in the pipe body, and a heat preservation layer is arranged on the outer layer of the nickel alloy layer. The protective layer is made of PVC materials and protects the surface of the pipe body, the anti-corrosion paint can improve the corrosion resistance of the surface of the pipe body and prevent the surface of the pipe body from being corroded by rainwater, and therefore the service life is prolonged, the heat preservation layer is filled with the glass wool, heat preservation can be conducted on the pipe body, heat dissipation is reduced, and the ceramic layer is provided with a smooth surface, so that the service life is prolonged. Therefore, when fluid flows in the pipeline, impurities are not easy to attach, cleaning is convenient, high-temperature environment can be borne, heat stability is good, various chemical media can be resisted, corrosion of various corrosive chemical substances such as acid, alkali and salt can be resisted, the pipe body is prevented from being corroded and perforated under the condition, normal production and operation are not affected, and the service life of the pipeline is prolonged. And safety accidents and environmental pollution are prevented.

The application relates to a temperature-resistant and acid-resistant heat exchanger and a generating process, which comprises the following steps: a heat exchange pipe group is composed of a plurality of corrosion-resistant heat exchange pipes; the heat exchange pipes are immersed in corrosive chemical liquid and are used for circulating heat exchange of heat exchange medium; a support is used for supporting and fixing the heat exchange pipe group; a collecting component is used for collecting the pipe openings of the plurality of corrosion-resistant heat exchange pipes to form a multi-in and multi-out parallel circulating flow path; a cold water circulating inlet and a cold water circulating outlet are connected with the collecting component respectively and are used for connecting external cold water circulation. The application adopts the corrosion-resistant heat exchange pipes, and all joints are arranged outside the corrosive chemical liquid, so that the corrosion leakage risk is fundamentally eliminated, and long-term stable operation and maintenance-free use are realized.

To provide a box-shaped molding which holds chemical resistance equivalent to a PPS resin even when a strongly attacking chemical is used, and can achieve both high gas barrier property and strength without generating a burr in molding.SOLUTION: A box-shaped molding has a box shape composed of four surfaces, and has a liquid contact part therein, wherein the liquid contact part is formed of a resin composition containing (a) a crystalline resin, (b) an amorphous resin and (c) a filler, and in morphology analysis by SEM of the resin composition, a phase containing (a) the crystalline resin forms a sea and a phase containing (b) the amorphous resin forms an island, a number average particle diameter of the island is 0.2-1.3 μm, and 60-degree incident angle surface glossiness of the liquid contact surface of the liquid contact part is 85 or more.SELECTED DRAWING: None

The utility model discloses a stirring paddle suitable for a glass kettle, which comprises a stirring shaft used for stirring corrosive chemicals; the surface of the upper stirring paddle blade assembly is fixedly connected with the surface of the stirring shaft, the upper stirring paddle blade assembly is used for stirring corrosive chemicals, and the bottom stirring paddle blade assembly is used for stirring the corrosive chemicals; the utility model relates to the technical field of stirring paddles. According to the stirring paddle suitable for the glass kettle, the stirring shaft is arranged, a small section of stainless steel rod is exposed out of the stainless steel cylindrical rod and used for clamping and transmitting power of a stirrer, the first polytetrafluoroethylene coating is in a cylindrical shape with the outer diameter being 20 mm, the surface is smooth and uniform, stirring and sealing are facilitated, and the diameter is increased through the second polytetrafluoroethylene coating; the coating plane is provided with two opposite planes on the polytetrafluoroethylene cylindrical surface, and the two planes are used for fixing the upper stirring blade assembly and preventing the stirring blade assembly from sliding left and right.

The invention discloses a high-specific-surface-area nitrogen-doped lignin mesoporous carbon sphere as well as a preparation method and application thereof. The method comprises the following steps: firstly, carrying out solvothermal reaction on a cyanamide nitrogen source calcined product to prepare soluble g-C3N4, and then sequentially adding a weakly acidic potassium acrylate aqueous solution and a soluble g-C3N4 aqueous solution into a lignin organic solvent / water mixed solution under an ultrasonic condition to obtain g-C3N4-lignin / potassium acrylate supramolecular spheres; and directly carbonizing the obtained supramolecular spheres to prepare the nitrogen-doped lignin mesoporous carbon spheres with high specific surface area. The method is simple, does not need corrosive chemical reagents, and can be applied to large-scale production; the high specific surface area provides abundant ion adsorption sites, and the electric double-layer capacitance is remarkably improved; the high nitrogen doping can introduce pseudocapacitance with the capacity being more than five times of that of an electric double-layer capacitor, so that the specific capacitance of the mesoporous carbon sphere is effectively improved; and the mesoporous structure is integrated, so that the transmission of hydrated zinc ions is accelerated, and the rate capability is effectively improved.

The invention discloses a high-strength explosion-proof protective coating and a production process thereof, and the high-strength explosion-proof protective coating comprises the following raw materials: 100-150 parts of a resin base material; 5-10 parts of a composite antibacterial agent; 8-12 parts of an ultraviolet self-activation reinforcing material; and 10 to 20 parts of self-repairing polymer microspheres. The production process of the high-strength explosion-proof protective coating comprises the following steps: S1, resin pretreatment, S2, preliminary mixing, S3, dispersion treatment, S4, self-repairing material addition, and S5, filtration. The service life of equipment is remarkably prolonged, corrosion of highly corrosive chemical raw materials is resisted in a chemical reaction kettle, and damage of microorganism breeding to the reaction kettle is reduced; the outdoor equipment of the power substation is tested by ultraviolet rays and severe weather, so that the damage of the equipment caused by environmental factors is greatly reduced, the overall service life of the equipment is prolonged, and the replacement frequency and cost of the equipment are reduced.

A genus of rare earth containing chemicals is disclosed. These rare earth containing chemicals are suitable for use in sequential vapor deposition processes to form rare earth fluoride or rare earth oxyfluoride films. Such films may be used to protect materials and devices from corrosive chemicals.

The invention relates to a method for preparing alpha-Al2O3 by directly hydrolyzing a high-activity aluminum alloy, and belongs to the technical field of metal materials. Aluminum is activated, so that the aluminum can react with water at normal temperature and normal pressure, and the conversion rate of the aluminum is close to 100%; the hydrolysis product is subjected to acid pickling treatment, the purity of the hydrolysis product is improved, then the hydrolysis product subjected to acid pickling is subjected to calcination treatment, and finally the high-purity alpha-Al2O3 is obtained. Compared with an alkoxide method, corrosive chemicals are not used, and the preparation process is safer and more environmentally friendly. High temperature and high pressure are not needed, the preparation process is simpler and more efficient, and the preparation cost is reduced.

The utility model discloses an experiment table with a concealable display screen, and relates to the technical field of experiment tables. Supporting legs are fixedly connected to the bottom of the table top, a main cabinet is fixedly connected to the top of the table top, a console is fixedly connected to the top of the main cabinet, a cavity is formed in the main cabinet, a cabinet door is hinged to one side of the cavity through hinges, and a movable plate is slidably connected into the cavity. According to the chemical experiment cabinet, the cabinet door, the moving plate and the adjusting assembly are arranged, students pull the cabinet door to lift the cabinet door upwards to drive an internal display screen to move out of the interior of the cavity according to the guide of the adjusting assembly, so that the students can watch videos or teach teachers, and when some corrosive chemical experiments are prepared, the cabinet door can be closed, and the students can conveniently carry out chemical experiments. And the moving plate is pushed to drive the display screen to move towards the interior of the cavity through guiding of the adjusting assembly, so that the display screen is hidden and prevented from being corroded by acid liquor.

The invention discloses an up-conversion composite nanocrystal and a green preparation method thereof, a nanocapsule which takes a high polymer material as a shell and is internally coated with an up-conversion precursor solution is obtained by using a water-in-oil miniemulsion technology, and then the up-conversion composite nanocrystal material is obtained through solvent volatilization and confinement crystallization in the nanocapsule. According to the method, green preparation of the up-conversion nanocrystal under mild conditions is realized, the reaction temperature is 50 DEG C, all organic solvents can be recycled, a small amount of water is used as a volatile solvent, and high-corrosion chemicals are not involved. Meanwhile, the obtained up-conversion composite nanocrystal can obtain high quantum yield under low energy density, and the quantum yield can reach 15.5% under the energy density of 10 W cm <-2 >. The preparation method provided by the invention is suitable for preparing any composite nanocrystal of the rare earth doped upconversion material with high solubility.

The utility model relates to the technical field of semiconductor manufacturing equipment, specifically discloses a kind of high durability pneumatic diaphragm valve ptfe diaphragm, including valve body, diaphragm and sealing valve cover;The top of the valve body is equipped with mounting groove;The diaphragm is arranged in mounting groove, the diaphragm is made of PTFE material, and on its axial section, the deformation end of the diaphragm has inverted V-shaped structure consisting of convex double circular arc;The lower part of the sealing valve cover is pressed into mounting groove, the bottom of the sealing valve cover is equipped with cavity, the cavity is opposite with the deformation end of diaphragm, and provides movement space for the bidirectional deformation of the deformation end;The diaphragm avoids fatigue rupture by bidirectional deformation structure, double static sealing and self-adapting dynamic sealing prevent leakage, and the optimized thickness and cavity design guarantee response speed and deformation smoothness, can improve the durability and reliability of pneumatic diaphragm valve in semiconductor wet process, applicable to ultrapure, strong corrosive chemical conveying scene.

The invention discloses a corrosion chemical packed tower inner supporting structure, and relates to the technical field of chemical packed towers, the corrosion chemical packed tower inner supporting structure comprises a first supporting frame and an auxiliary tool assembly, and the bottom of the first supporting frame is provided with a bottom flow guide assembly. During use, the pull rod is pulled through the C-shaped hook, and the limiting ratchets are pulled out of the I-shaped block and separated from the annular ratchets. The rotating disc is rotated, the upper toothed plate and the lower toothed plate are driven to move oppositely, the two reinforcing supporting plates are pushed to move through the connecting rod, the single-fork supporting plate and the double-fork supporting plate abut against the three corners in the step component correspondingly, the reinforcing rod enters the reinforcing groove, and the two reinforcing supporting plates abut against the spire component. And then the C-shaped hook is pushed downwards, so that the limiting ratchets are meshed with the annular ratchets again. The two step components are obliquely supported and reinforced while the spire component is vertically supported, so that the overall structural strength and structural integrity of the step tower assembly are improved, and the compression resistance and deformation resistance of the step tower assembly are enhanced.

The invention discloses corrosive chemical coating mixing preparation equipment which comprises a mixing cylinder, a transmission rod is rotatably mounted in the mixing cylinder, two driving mechanisms are mounted on the transmission rod, a liquid guide disc is fixedly mounted on the surface of the transmission rod and located below the driving mechanisms, and two mixing mechanisms are fixed to the inner wall of the mixing cylinder. The mixing mechanism is located below the driving mechanism, a motor is installed in the middle of the top face of the mixing barrel, the power output end of the motor is connected with the upper end of the transmission rod, a feeding opening is formed in one side of the top face of the mixing barrel, and a sealing cover is installed at the feeding opening. The mixing mechanism is driven by the driving mechanism on the transmission rod to move, so that transverse stirring and longitudinal stirring are realized. In the transmission process of the transmission rod, the mixing rod revolves along with the gear, and the bull eye wheel at the tail end of the mixing rod moves in the annular groove formed by the eccentric disc, so that the sleeve and the mixing rod are forced to generate axial telescopic swing at the same time, and a composite planetary motion trail is formed.

The utility model discloses an atomic fluorescence spectrophotometer, and particularly relates to the technical field of atomic fluorescence spectrophotometers, which comprises an atomic fluorescence spectrophotometer, an atomizer is arranged in the atomic fluorescence spectrophotometer, a sampling cavity is arranged on the surface of the front side of the atomizer, and an adjusting mechanism is arranged in the sampling cavity. A protection mechanism is arranged on the front side of the atomizer; the adjusting mechanism comprises an upper moving plate and a lower moving plate, and the upper moving plate and the lower moving plate are both arranged in the sampling cavity. By arranging the protection mechanism and the flushing mechanism, corrosive chemical liquid can be effectively prevented from being splashed out through the arrangement of the protection door, the safety of operators is protected, after measurement is completed, water is pumped into the connecting water pipe and the telescopic hose through the water pump, a solution remaining in the microsyringe is flushed, and the safety of the microsyringe is improved. The influence of the last solution residue on the next detection precision is effectively prevented, and the accuracy of each detection is ensured.

The utility model relates to the technical field of environment monitoring, and discloses an environment detection corrosion-resistant storage box, which comprises a storage box main body, a handle and a temperature controller main body, a classification mechanism is arranged in the storage box main body, an auxiliary mechanism is arranged on the classification mechanism, the classification mechanism comprises a drawing plate, and the drawing plate is arranged on the handle. The drawing plate is slidably connected to the inner wall of the right side of the storage box body, a clamping opening is formed in the outer wall of the top of the drawing plate, a classification sample tube is clamped to the inner wall of the top of the clamping opening, rotating rods are rotatably connected to the inner walls of the front side and the rear side of the clamping opening through bearings, and torsional springs are fixedly connected to the outer walls of the side faces of the rotating rods; the outer wall of the side face of the rotating rod is fixedly connected with a cover plate. According to the storage box, by arranging the structures such as the drawing plate, the cover plate and the sample classifying pipes, corrosive chemical samples are classified and distinguished, openings of the sample pipes are sealed and isolated, and corrosion damage to components in the storage box due to mutual fusion of corrosive gas is reduced.

The utility model relates to the technical field of PVDF (Polyvinylidene Fluoride) membranes, in particular to a microporous PVDF membrane for a filter element, which comprises a PVDF membrane body, the upper surface of the PVDF membrane body is fixedly connected with an activated carbon layer, and the lower surface of the PVDF membrane body is fixedly connected with a hydrophilic modified layer. According to the utility model, the wastewater is filtered, peculiar smell, pigments, part of heavy metal ions and the like in the wastewater can be adsorbed, dirt particles can be prevented from being attached and accumulated on the surface of the membrane, and meanwhile, through the corrosion-resistant layer, the corrosion resistance of the membrane is improved. The film body structure can be effectively prevented from being corroded by external acid, alkali, salt and other corrosive chemical substances, so that the key structure and performance of the film are protected, in addition, the supporting layer provides strong mechanical supporting force for the whole film structure, external force such as pressure, pulling force and friction force borne by the film in the using process can be borne, and the service life of the film is prolonged. The conditions of rupture, deformation or damage and the like of the film are prevented.

The utility model discloses a high-corrosion chemical wastewater acid-resistant pipeline flange sealing structure, which relates to the technical field of chemical environment-friendly equipment and comprises a plurality of pipelines, a flange arranged on the outer wall of the pipeline on the left side and a second flange arranged on the outer wall of the pipeline on the right side. The inner wall of the flange and the inner wall of the second flange are each provided with a sealing mechanism, each sealing mechanism comprises a plurality of threaded holes, the threaded holes are formed in the inner wall of the flange and the inner wall of the second flange, and the outer walls of the threaded holes are connected with flange bolts in a sliding mode. Then a nut matched with a flange bolt is tightened, when the nut makes contact with the gasket, the gasket is pushed forwards, when the gasket starts to move forwards, the sliding shaft is driven to slide on the fixed shaft, the spring is extruded in the sliding process of the sliding shaft, and the effect of preventing leakage of the sealing face due to insufficient pre-tightening force is achieved; and medium leakage caused by a gap of the sealing surface is avoided.

The invention relates to the technical field of welding wire cleaning, in particular to a mechanical cleaning method and device for the surface of an aluminum welding wire. The cleaning method comprises the following steps that S1, the welding wire penetrates through first treatment liquid containing water and spherical abrasive, a variable magnetic field is applied to drive the spherical abrasive to move, and impact hardening treatment is conducted on the welding wire; s2, enabling the welding wire treated in the step S1 to pass through a second treatment solution containing water, a passivation solution and a needle-shaped grinding material, applying a variable magnetic field to drive the needle-shaped grinding material to move, and performing polishing and passivation treatment on the welding wire; and S3, the welding wire treated in the step S2 is dried and wound. The magnetic field is used for driving the abrasive to conduct contact type mechanical cleaning on the welding wire, no corrosive chemical solvent is depended on, pollution to the environment is small, and the good cleaning effect can be obtained through normal-temperature cleaning; and meanwhile, the surface strengthening and passivating functions are considered.

The invention discloses a non-wood raw material pretreatment method and application thereof, and belongs to the technical field of papermaking industry. According to the pretreatment method, the pH of the environment where the non-wood raw materials are located can be increased without adding NaOH or other alkali, damage of NaOH or other alkali to the non-wood fiber structure is replaced, the fiber pre-softening effect is achieved, and the follow-up pulping process is facilitated; pretreatment conditions are mild, cooking is not needed, and energy consumption is low; the operation is simple and easy; toxic and harmful substances or highly corrosive chemical reagents are not used, no toxic and harmful substances are generated, the wastewater yield is extremely low, the method is friendly to equipment and environment, and the production cost and pollution treatment cost can be effectively reduced; the pretreatment method provided by the invention is high in resource utilization rate, can be used for pretreatment of non-wood raw materials in the papermaking industry, and has a huge application prospect.

The invention discloses a sequential activation method for preparing spherical graded porous carbon and application, and relates to the field of electrochemical energy storage materials. The spherical graded porous carbon is prepared by treating a spherical carbon-based precursor through the steps of water vapor activation, inert gas purging and cleaning, carbon dioxide activation and the like. The prepared spherical graded porous carbon keeps the spherical morphology of the precursor, has high specific surface area, high conductivity, high tap density and an optimized graded pore channel structure, effectively solves the traditional contradictions between high specific surface area and high conductivity and between microporous energy storage and mesoporous fast mass transfer, and provides a structural basis for the application of the material in different fields. The method adopts a pure physical sequential activation process, does not need to use a corrosive chemical activator, does not have chemical residues, does not corrode equipment, does not generate harmful tail gas in the reaction process, is green and environment-friendly, and is easy for industrial production.

The invention provides a 10X molecular sieve catalyst based on calcium ion exchange and a preparation method and application thereof, in the preparation process of the 10X molecular sieve catalyst, through control of calcium exchange rate and collaborative optimization of citric acid modification, the prepared catalyst shows high activity (conversion rate gt; 98.5%) and high selectivity (gt; the molecular sieve prepared by the preparation method disclosed by the invention has the advantages that the crystallinity and the structural stability of the molecular sieve are better maintained while pore channel widening and acidity optimization are realized, the service life of the catalyst is longer, the acidity and the pore diameter of the catalyst can be continuously and accurately adjusted between typical properties of 10X and 13X, an optimal equilibrium point for a target reaction is found, and the molecular sieve is suitable for Friedel-Crafts acylation reaction. The whole preparation method is simple, raw materials are easy to obtain, strong corrosive chemicals are not needed in the preparation process, the catalyst can be easily separated and recycled for multiple times, the emission of three wastes is greatly reduced, the ultra-long stable operation capacity exceeding 500 hours is shown in continuous flow production, and the preparation method is suitable for large-scale production.

The application discloses a chemical raw material conveying device with a flow monitoring function, which comprises a connecting pipe, a front pipe and a rear pipe, a mounting plate is fixedly connected to the middle part of the connecting pipe, a first rotating shaft is rotatably connected to the middle part of the mounting plate, a fan blade is fixedly connected to one end of the front pipe in the direction of the first rotating shaft, a first bevel gear is fixedly connected to the other end of the first rotating shaft, a second bevel gear is meshingly connected to the outer side of the upper part of the first bevel gear, a rotating speed measuring instrument is fixedly connected to the tail part of the second bevel gear and penetrates through the connecting pipe, and the rotating speed measuring instrument is fixedly connected to the outer side of the connecting pipe. Compared with a traditional external electronic sensor, the measuring error is reduced, the high-viscosity and corrosive chemical raw material is adapted, and the service life is long.

The invention discloses high-thermal-conductivity ionic liquid / aluminum oxide composite thermal-conductive gel as well as a preparation method and application thereof, and belongs to the technical field of thermal-conductive gel preparation. The high-heat-conductivity ionic liquid / aluminum oxide composite heat-conducting gel is prepared by taking an ionic liquid monomer as a polymer monomer and aluminum oxide as a filler through in-situ polymerization under the action of a cross-linking agent and an initiator, wherein the ionic liquid monomer is 1-butyl-3-methylimidazolium salt. The ionic liquid provided by the invention has thermal conductivity far higher than that of a traditional polymer. The high-thermal-conductivity ionic liquid / aluminum oxide composite thermal conductive gel is prepared by combining the ionic liquid and the Al2O3 filler, which can complement each other, and the provided high-thermal-conductivity ionic liquid / aluminum oxide composite thermal conductive gel has the characteristics of high thermal conductivity, high direct-current breakdown strength and strong flame retardance. The preparation method provided by the invention is suitable for mass production, does not involve the use of corrosive chemical reagents, and is easy to operate.

The invention belongs to the field of two-dimensional material preparation, and discloses a preparation method of a transition metal chalcogenide two-dimensional material transmission electron microscope sample. The preparation method comprises the following steps: preparing a transition metal chalcogenide two-dimensional material sample growing on the surface of a sample substrate; the method comprises the following steps: spin-coating and curing a load medium on the surface of a transition metal chalcogenide two-dimensional material sample, and then covering a heat release support material to obtain a stacked structure material; immersing the stacked structure material into deionized water, stripping the sample substrate to obtain a composite structure material, transferring the composite structure material to the surface of a transition substrate, and heating to obtain a transition structure material; the transition structure material is obliquely inserted into deionized water in the mode that the loading medium faces upwards, the floating loading medium loaded with the transition metal chalcogenide two-dimensional material is fished out through an electron microscope grid, drying is conducted, and the transition metal chalcogenide two-dimensional material transmission electron microscope sample placed on the electron microscope grid is obtained. According to the method, high-risk corrosive reagents such as strong alkali or strong acid used in a traditional method are abandoned, deionized water is mainly used as a stripping medium in the whole process, safety threats such as burning and poisoning of highly corrosive chemicals to operators are fundamentally eliminated, the harsh requirements for ventilation and protection facilities of a laboratory are reduced, and the service life of the laboratory is prolonged. And the operation process is safer and milder.

The application relates to a magnetic driving centrifugal pump structure resistant to strong corrosive chemical medium, which comprises a pump body and a working end, a filtering end for filtering the medium is arranged above a water inlet at the top of the working end, and a backwater end for fault tolerance of dry running is fixedly connected to the top of the working end; the application relates to the technical field of centrifugal pumps. The magnetic driving centrifugal pump structure resistant to strong corrosive chemical medium realizes online self-cleaning filtration based on fluid power: a rotatable filter cylinder is arranged in a pipeline, an impeller is installed at the top of the filter cylinder, and the impeller and the filter cylinder are driven to rotate by the impact force of the downward flow of the medium. The push plate on the surface of the filter cylinder continuously pushes the intercepted solid impurities to the edge of the output section during the rotation, the impurities are automatically gathered by centrifugal force and fluid scouring, and the defects that the traditional filter screen needs to be frequently stopped and cleaned due to blockage are avoided.

The utility model relates to the technical field of pressure release valves, and discloses a corrosion-resistant stainless steel pressure release valve, which is characterized in that interfaces are arranged at two ends of a valve body, a channel and a sealing groove are arranged in the valve body, an upper interface and a top seat are arranged above the valve body, and a movable opening and a sealing mechanism are arranged in the top seat. The sealing mechanism comprises a rotating sleeve, a spring, a spring clamping seat and a screw rod, the screw rod is connected with a pressure head, and a corrosion-resistant sealing sleeve is arranged outside the pressure head. And the corrosion-resistant sealing sleeve is tightly matched with the sealing notch, so that the sealing performance of the valve body is remarkably improved when the valve body faces strong acid, strong alkali or other corrosive chemical substances. Due to the use of the corrosion-resistant sealing sleeve, the service life of the valve is prolonged, and the maintenance cost is correspondingly reduced. In addition, the disassembly and assembly mode is simpler and more convenient, the time and labor intensity required for maintaining or replacing quick-wear parts are reduced, and meanwhile the risk that the valve body is damaged in the disassembly process is reduced.

The utility model relates to the technical field of chemical raw material conveying, in particular to a chemical pipeline check valve which comprises a confluence barrel, conveying pipes, a top pipe, a sealing cover and an adjusting device, the conveying pipes are installed on the two sides of the confluence barrel and communicated with the confluence barrel, the top pipe is installed at the bottom end of the confluence barrel, the sealing cover is installed on the surface of the top pipe, and the top pipe is communicated with the confluence barrel. The adjusting device is arranged on the surface of the top pipe and comprises two backflow rings, and the two backflow rings are fixedly connected with the surfaces of the two sides of the confluence cylinder and communicated with the confluence cylinder. According to the check valve, by arranging the adjusting device, the situation that chemical raw materials influence the sealing assembly is effectively reduced, when conveying of the chemical raw materials is stopped, the adjusting device is adjusted, the situation that a large amount of chemical raw materials flow back and make contact with the blocking block is avoided, the practicability of the check valve is improved, and the auxiliary performance of the check valve is improved; the service life of the check valve is prolonged, and damage to the interior of the check valve caused by corrosive chemical raw materials is reduced.

The invention discloses a multi-performance coupling test system for a chemical protection product in an extreme environment, and belongs to the field of performance test of chemical protection products. The system adopts a modular integration and bus type communication architecture, and the core comprises five modules, namely an environment simulation module, a test cabin module, a data processing module, a dynamic interference module and an auxiliary function module. The environment simulation module constructs a low-temperature / high-temperature + high-pressure + high-humidity + corrosive chemical coupling environment through fuzzy PID cooperative control, the test cabin module adopts an electrochemical-spectrum composite sensing array to synchronously collect permeation, mechanical and sealing performance data, and the data processing module realizes coupling analysis and failure early warning through a BP neural network. The dynamic interference module simulates vibration, airflow and other real working condition interferences, and the auxiliary module integrates chemical cyclic regeneration and safety protection functions. The nitrile rubber protective glove test verifies that the sample test efficiency is improved, and the chemical cost is reduced. The problems of one-sided scene, low precision, poor efficiency and the like in the prior art are solved.