85 results about "Compression set" patented technology

The invention discloses a preparation method of a rubber waterstop material with a low compression set rate, which comprises the following steps: firstly, carrying out blending reaction on hydroxyl silicone oil and boric acid to obtain liquid polyborosiloxane; the preparation method comprises the following steps: adding liquid polyborosiloxane and natural rubber into an internal mixer according to a ratio, and carrying out internal mixing to obtain a mixture; adding zinc oxide, an anti-aging agent, stearic acid and an anti-tearing agent into the obtained mixture, and continuously mixing; continuously adding kaolin talcum powder, calcium carbonate, calcium oxide, white carbon black, N550, N330 and KH550, and internally mixing again to obtain a preform; adding a vulcanization accelerator and a vulcanizing agent into the preform, and continuously mixing to obtain a rubber material to be vulcanized; and vulcanizing and forming the rubber material to be vulcanized to prepare the rubber water-stop belt material with the low compression set rate. According to the invention, the compression set rate of the rubber material can be reduced while the tensile strength, elongation, tear resistance and other properties of the rubber are not sacrificed, so that the product performance is enhanced.

The invention relates to the field of shoe materials, and particularly discloses an EVA and PEBAX blended foaming material for shoes and a preparation method of the EVA and PEBAX blended foaming material. The EVA and PEBAX blended foaming material for the shoes is prepared from the following raw materials in parts by weight: 70 to 90 parts of EVA resin, 10 to 30 parts of PEBAX, 0.8 to 1.2 parts of dodecyltrimethylammonium bromide modified rectorite, 2 to 5 parts of a foaming agent, 0.5 to 2 parts of a foaming aid, 3 to 5 parts of filler, 2 to 4 parts of a reinforcing agent, 0.5 to 2 parts of a cross-linking agent, 0.6 to 3 parts of a lubricating agent and 1 to 4 parts of a compatilizer. The material for the shoes has the advantages of being high in tear strength, uniform in foaming, light in weight and small in permanent compression deformation.

The invention belongs to the technical field of polyurethane materials, and provides high-frequency high-damping low-compression permanent deformation polyurethane and a preparation method and application thereof.The high-frequency high-damping low-compression permanent deformation polyurethane is prepared from a polyol component and an isocyanate component according to the proportion that the isocyanate index is 1.05-1.15; wherein the polyol component is prepared from the following components in parts by mass: 60 to 80 parts of polyether polyol, 15 to 25 parts of a chain extender, 15 to 25 parts of a damping agent, 3 to 8 parts of nano montmorillonite, 0.03 to 0.08 part of a catalyst and 0.5 to 1.5 parts of an antioxidant; the isocyanate component is a mixture of 4, 4 '-diphenylmethane diisocyanate and hexamethylene diisocyanate in a mass ratio of (2.5-3): 1; the polyurethane material is good in damping performance and low in compression set, has certain flame retardant property, is used for preparing the base plate for the railway, has excellent vibration and noise reduction and steel rail stripping and abrasion inhibition effects, and remarkably prolongs the service life of the steel rail.

The invention discloses self-adhesive single-component liquid silicone rubber with low compression set and a preparation method thereof. The preparation method comprises the following steps: kneading high-viscosity double-end vinyl polydimethylsiloxane, white carbon black, hexamethyldisilazane and water to prepare base rubber; and uniformly mixing and stirring the base rubber with double-end vinyl polydimethylsiloxane, polydimethylmethylvinylsiloxane, polydimethylmethylhydrosiloxane, a first functional aid, a second functional aid, an inhibitor and a catalyst in proportion to prepare the single-component liquid silicone rubber. The silicone rubber has excellent bonding performance on various substrates such as stainless steel, aluminum materials, copper materials, kovar alloys, nylon, polycarbonate and PBT (polybutylene terephthalate), has excellent mechanical properties and low compression set rate, is suitable for sealing and bonding of various automobile, industrial and electronic components, and has wide application prospects. The present invention relates to a sealing strip, in particular to a sealing adhesive scenario for in-situ curing sealing gasket (CIPG) applications, instead of a conventional sealing strip.

The invention relates to the technical field of high polymer material and automobile part manufacturing, and discloses a high-durability high-low temperature resistant automobile composite sealing strip, which is prepared from the following raw materials: ethylene propylene diene monomer, polyisoprene grafted maleic anhydride, pre-dispersed master batch, carbon black and a vulcanization system. The pre-dispersed master batch takes oxidized polyethlene wax as a carrier to wrap zinc oxide and D-mannitol. The phase change characteristic of the carrier is utilized, active components are isolated in the mixing and extruding stage, and scorching is prevented; the components are released in the high-temperature vulcanization stage to initiate anhydride ring opening, and a double cross-linked network with coexistence of covalent bonds and ionic bonds is constructed. According to the sealing strip, the macromolecular reactive plasticizer is used for replacing part of liquid paraffin, the atomization problem caused by micromolecule migration is solved, the high-temperature compression permanent deformation rate is remarkably reduced through a thermal reversible mechanism of an ion cluster, and excellent low-temperature rebound resilience and processing safety are both considered.

The invention relates to the technical field of polyurethane materials, in particular to a polyurethane elastic backing plate for a railway and a preparation method of the polyurethane elastic backing plate. The polyurethane elastic base plate provided by the invention is a low-compression permanent-deformation polyurethane elastic base plate for a railway, the raw materials and the preparation process of the polyurethane elastic base plate are specifically shown in the following description, and under the matching of the whole formula, the microphase separation degree of a hard section and a soft section in long-term service is effectively controlled; the polyurethane elastic backing plate not only has low compression set, but also has excellent tensile mechanical properties and static stiffness, lower-35 DEG C low-temperature static stiffness change rate, lower dynamic and static stiffness ratio and lower 30-day high-temperature aging static stiffness change rate.

A clamp assembly for adjusting the fluid flow rate in an infusion set is provided. The clamp assembly includes a housing having two opposing side walls spaced apart from each other and having opposing guide grooves, a guide wall disposed between the side walls, an elastomeric segment disposed between the two opposing side walls and the guide wall, the elastomeric segment having a lower compression set performance that the compression set performance of first and second IV tubes of the infusion set, and first and second tubing ports. A flow-regulating member is seated in the guide grooves and is configured to remain in a set position during use of the infusion set based on the compression set performance of the elastomeric segment until the roller wheel is moved by a user. A method of operating a clamp assembly is also provided.

The present invention provides a photocurable resin composition capable of forming a cured product that has excellent adhesiveness and allows for easy dimensional control of compression ratio, with almost no permanent compression set.　The photocurable resin composition according to the present invention contains components (A) to (C), and contains 50 parts by mass or more of component (B) per 100 parts by mass of component (A). Component (A): a monofunctional urethane (meth)acrylate oligomer having a hydrogenated polybutadiene skeleton. Component (B): a monofunctional (meth)acrylate monomer having a C5-10 linear alkyl group (excluding component (A)). Component (C): a photoradical polymerization initiator.

The utility model discloses a compressor impeller dismounting device of a centrifugal steam compressor, which can more easily dismount a compressor impeller and save manpower. Comprising a transverse plate, one end of the transverse plate fixes a vertical plate, one end of the vertical plate fixes a square plate, the square plate fixes a hanging plate extending downwards, and an L-shaped limiting face is arranged at the bottom of the square plate; the lower portion of the hanging plate is sleeved with a pressing sleeve, the pressing sleeve is used for being arranged on an impeller locking nut in a sleeved mode, the end face of one end of the pressing sleeve is used for being pressed on an air compression impeller for positioning, the other end of the pressing sleeve is provided with a first threaded hole, one end of a threaded rod is in threaded fit with the first threaded hole, and the end of the threaded rod is provided with a second threaded hole. The other end of the threaded rod is sequentially sleeved with a positioning nut and a threaded rod sleeve to form threaded fit, the peripheral face of the threaded rod sleeve is in threaded fit with a limiting nut, and the outer surface of the limiting nut is matched with the L-shaped limiting face of the square plate.

The invention provides a rubber composite material as well as a preparation method and application thereof, and belongs to the technical field of bridge supports. The rubber composite material comprises the following raw materials in parts by mass: 100 parts of matrix resin, 35-45 parts of hydroxyl modified fumed silica, 8-12 parts of a plasticizer, 3-5 parts of nano-zinc oxide, 3-5 parts of a composite anti-aging agent, 3-4 parts of a coloring agent, 2-2.8 parts of a cross-linking agent, 1-2 parts of a coupling agent and 0.05-0.1 part of a platinum complex catalyst, wherein the composite anti-aging agent comprises a hindered amine stabilizer and an organic tin antioxidant. The obtained rubber composite material is excellent in weather resistance, free of cracking after ozone exposure and wide in temperature adaptability, the tensile strength is improved by 20%, the compression set is reduced by 52%, the mechanical property is obviously improved, the rubber composite material is applied to a bridge support, the service life of the prepared support can reach 60 years or above, and the service life of the bridge support is greatly prolonged.

The invention relates to the technical field of silica gel high polymer materials, in particular to temperature-resistant low-compression-deformation foamed silica gel and a preparation process thereof. The problem that in the prior art, foamed silica gel is poor in high-temperature resilience performance is solved. The foamed silica gel is prepared from a component A and a component B through dynamic mixing and injection molding, wherein the basic sizing material adopts vinyl-terminated polydimethylsiloxane, vinyl-terminated polymethylphenyl siloxane and vinyl phenyl MQ silicon resin, and is matched with HMDS in-situ modified fumed silica to construct an enhanced network; a side chain fluorine-containing foam stabilizer and a liquid-phase cerium complex are introduced into the component B; a three-stage temperature control process of nucleation foaming, gel explosion and vulcanization after gradient high temperature is adopted. Through addition of the nano rigid particles and deep thermodynamic relaxation treatment, the problems of collapse and rebound failure of a closed pore structure of existing foamed silica gel at long-term high temperature are solved, and the foamed silica gel is suitable for heat-resistant sealing and buffer heat insulation of new energy batteries and precise electronic components.

This invention discloses a FEBD seamless bridge deck connection plate and a cross-joint bridge deck structure and construction method, comprising several UHPC blocks arranged sequentially along the longitudinal direction of the bridge, T-shaped expansion joints between adjacent UHPC blocks, and compressible elastic material filling the T-shaped expansion joints. The invention is characterized by further comprising: steel formwork, tension cables, insulating hoses, and series springs. This invention not only automatically adapts to the expansion and contraction deformation of the bridge caused by temperature changes, but also resists or eliminates uneven stress concentration along the transverse direction of the T-shaped expansion joints, and improves the overall rotational and flexural deformation performance of the beam ends. Furthermore, when the compressible elastic material loses its elasticity and undergoes permanent compression deformation after prolonged use, causing it to detach from the steel formwork within the T-shaped expansion joint, the tension cables can be used to bring the series-connected UHPC blocks together, thereby reducing the width of the T-shaped expansion joint and allowing the compressible elastic material to re-fit and contact the steel formwork.

The application provides a simulation analysis method for compression deformation characteristics of a rubber pad, and relates to the field of rubber pad product testing. The application constructs a finite element grid model based on geometric parameters and initial material parameters of the rubber pad, identifies geometric singularity regions with displacement gradient mutation; applies a test loading load on the model, extracts displacement path curvature and performs gradient correction on material parameters, and constructs a local material constitutive relation; performs compression deformation simulation based on the local constitutive relation, analyzes strain energy accumulation sequence and determines an energy transmission control region; determines a dominant constraint mode in combination with the spatial corresponding relationship between the energy transmission control region and the geometric singularity region, and performs incremental correction on the simulation result, so as to realize accurate prediction of non-uniform compression deformation characteristics of the rubber pad.

The application discloses a thermoplastic elastomer with low compression permanent deformation characteristics, which comprises the following raw materials in parts by weight: 45-55 parts of hydrogenated polystyrene-butadiene-styrene block copolymer, 25-30 parts of polystyrene, 2-6 parts of vulcanizing agent, 3-6 parts of hydroxyl silicone oil, 2-5 parts of auxiliary oil, 5-7 parts of filler and 1-2 parts of antioxidant. The thermoplastic elastomer uses the hydrogenated polystyrene-butadiene-styrene block copolymer and polystyrene as the base material, and adds vulcanizing agent, hydroxyl silicone oil and auxiliary oil to enhance the functional effect of the product and improve the low compression permanent deformation characteristic performance of the product.

The utility model discloses a kind of label paper compression setting devices, including rack and two compression mechanisms, conveying frame and conveyor are provided on the rack, two The compression mechanism is correspondingly set in the position of rack above and below conveying frame, the compression mechanism includes driver, mounting seat and lifting seat, the lifting seat is slidably connected with the mounting seat;The compression mechanism of the label paper compression setting device above conveying frame is driven by driver to move lifting seat and limit pressure seat downwards, the compression mechanism below conveying frame is driven by driver to move lifting seat and top base upwards, top base extends from conveying frame and lifts egg box on conveying frame to limit pressure seat, and then automatically carries out compression setting processing to egg box and label paper, replaces manual operation mode and improves work efficiency, and top base lifts egg box and limit pressure seat cooperation to carry out compression processing can limit egg box, to prevent the deviation of the conveying position of egg box.

A rubber compression permanent deformation detection device disclosed by the present invention comprises a box body, the top of the box body is fixedly connected with a plurality of vertical rods, the plurality of vertical rods are arranged in a rectangular array, the top ends of the plurality of vertical rods are jointly and fixedly connected with a top plate, and the positions, close to the top ends, of the outer sides of the plurality of vertical rods are jointly and fixedly sleeved with a placement plate. A rectangular opening is formed in the top of the placing plate, an air cylinder is fixedly connected to the top of the top plate, and the bottom end of a power output shaft of the air cylinder penetrates through the top plate and is fixedly connected with a heating plate. And when the position of the heat preservation box is restored, the rotating plate is driven to turn over, when the rotating plate turns over, the scraping plate can be driven to move, the surface of the electric heating plate is cleaned, and rubber is prevented from being adhered to the surface of the electric heating plate under the high-temperature condition.

The invention belongs to the technical field of thermoplastic polyurethane elastomers, and relates to a thermoplastic polyurethane elastomer for supercritical foaming and a preparation method thereof. The preparation method comprises the following steps: (a) uniformly mixing cerium-doped mesoporous titanium dioxide with a micromolecular dihydric alcohol chain extender to obtain a mixture; and (b) mixing the mixture, organic diisocyanate and polyether glycol, and carrying out polymerization reaction to obtain the thermoplastic polyurethane elastomer for supercritical foaming. The preparation method is simple, the prepared thermoplastic polyurethane elastomer for supercritical foaming integrates high melt strength of TPU and a wide supercritical foaming temperature window, and a foam product prepared from the thermoplastic polyurethane elastomer for supercritical foaming has excellent falling ball resilience and low compression set.

Provided is a charging roll for electrophotographic equipment that is provided with a surface layer that can reduce both compression set and wear of a photosensitive member, and that can also reduce changes in characteristics due to moisture absorption. [Solution] A charging roll 10 for an electrophotographic device comprises a shaft 12, an elastic layer 14 formed on the outer peripheral surface of the shaft 12, and a surface layer 16 formed on the outer peripheral surface of the elastic layer 14, wherein the surface layer 16 includes the following (a) to (c): (a) Crosslinked water-dispersible polyurethane dispersion (b) Crosslinked water-dispersible isocyanate (c) Crosslinked composite of water-dispersible polyurethane dispersion and water-dispersible isocyanate

This invention discloses a high-resilience EPDM rubber sealing gasket and its preparation method, belonging to patent classification number C08K13 / 02, and relating to the field of EPDM rubber technology. The method first introduces flexible segments composed of liquid polyisobutylene and hydroxyl-terminated polybutadiene into an EPDM matrix to construct a low-energy-consumption subelastic network; then, a core-shell structure filler with silica as a rigid core and acrylate copolymer as an elastic shell is prepared to eliminate the rigid constraints of traditional filler interfaces; simultaneously, hyperbranched polyesteramide and nano-boron nitride are introduced as a synergistic system to bridge the polarity difference between the flexible segments and the core-shell filler through molecular bridging, and to reduce energy loss by utilizing the low friction and thermal conductivity of nano-boron nitride. The resulting sealing gasket exhibits high resilience, low compression set, and excellent mechanical strength.

To provide a fluorinated copolymer composition whereby a crosslinked rubber article which has a low compression set at high temperature and which is not broken after compression can be formed, and a crosslinked rubber article. The fluorinated copolymer composition of the present invention comprises a fluorinated copolymer (A) having units having a nitrile group and units based on tetrafluoroethylene, a fluorinated copolymer (B) having units having at least one functional group selected from the group consisting of a group having a carbonyl group, a hydroxy group, an epoxy group and an isocyanate group and units based on tetrafluoroethylene, and a crosslinking agent.

The invention discloses a preparation method of a POE (Polyolefin Elastomer)-based sneaker insole material capable of accurately regulating and controlling crosslinking strength. The method comprises the following steps: blending insole materials containing an ethylene / alpha-olefin copolymer and a peroxide crosslinking agent, extruding and foaming. According to molecular structure parameters of an ethylene / alpha-olefin copolymer (POE) base material, the cross-linking strength of the shoe material is accurately controlled within an optimal interval, excessive / insufficient cross-linking is avoided, particularly, the gel content is controlled within the optimal range of 60-80%, and a high rebound rate and a low compression permanent deformation rate are brought to a foaming insole.

This disclosure relates to hydrosilylated (addition) curable silicone rubber compositions, silicone elastomer materials produced by curing said hydrosilylated (addition) curable silicone rubber compositions and having improved high-temperature (175°C) compression set according to ISO 815-1 Method A, and methods for preparing said silicone elastomer materials. This disclosure also extends to the use of such materials.

The present application relates to the field of rubber material immersion test, in particular to a kind of rubber compression permanent deformation and tensile immersion test device and test method, the device includes reactor, and the inside of reactor is equipped with inner liner, and the inside of inner liner is equipped with compression sample device and tensile sample support;Compression sample device includes upper fixed plate, intermediate support plate, fixed bolt B, fixed nut B and limiting pad, and a plurality of corresponding dismounting holes are provided on the upper fixed plate and the intermediate support plate, and the upper fixed plate and the intermediate support plate are connected by fixed bolt B and fixed nut B arranged in the dismounting hole, limiting pad is arranged on fixed bolt B, and compression sample is arranged between the upper fixed plate and the intermediate support plate;Tensile sample support is used for carrying out sample tensile test.The present application is a kind of rubber compression permanent deformation and tensile immersion test device, the device of the present application is made of thickened polytetrafluoroethylene, and can resist high temperature up to 250 DEG C, while resisting acid and alkali corrosion, can resist high temperature and acid and alkali environment under high temperature, and the use range is wider.

The invention provides rare earth modified EPDM rubber with low compression set as well as a preparation method and application thereof. The rare earth modified EPDM rubber is prepared from EPDM, rare earth core-shell particles, IL, sulfur, a phenolic resin cross-linking agent, BMI, an accelerant, an anti-aging agent, paraffin oil, carbon black, stearic acid and a processing aid. The technology of one-step in-situ modification, rubber master batch dilution, low-temperature mixing and common two-stage vulcanization is adopted, uniform dispersion of rare earth particles in an EPDM matrix is achieved, agglomeration and frosting are avoided, the CS value of the product under the compression condition of 100 DEG C * 70 h / 25% is 5.8%-7.8% and far lower than that of existing 25%-35%, the requirement that the CS value is smaller than or equal to 10% in a high-end scene is met, the CS retention rate is larger than or equal to 90% after aging is conducted for 168 h at 150 DEG C, and no rebound phenomenon exists; and the composition has the advantages of uniform and stable mechanical properties, high and low temperature resistance, aging resistance, processing and use stability and the like, has the advantages of high industrial feasibility and low process energy consumption, can be produced on a large scale, expands the application of the composition in the field of high-end sealing, and meets the strict use requirements of fuel cells, LNG (Liquefied Natural Gas) equipment, spacecrafts and other scenes.

[Problem] To enable a thermoplastic elastomer composition giving molded articles with excellent appearances and having improved processability during extrusion molding to be widely utilized in low-hardness applications. [Solution] The thermoplastic elastomer composition is characterized by having a Shore A hardness of 50 or less and having a compression set (CS) [%] measured in accordance with JIS K6262, a maximum melt tension [mN] which is the tension of a melt-strand filament at break when the thermoplastic elastomer composition in a molten state is extruded through a nozzle and the filament being consecutively solidified is continuously taken up, and a maximum take-up speed [m / min] which is the filament take-up speed [m / min] at the time when the maximum melt tension [mN] was measured, the compression set, the maximum melt tension, and the maximum take-up speed satisfying expression (Z).

The invention discloses a fluororubber sealing material and a synthesis process and application thereof, and belongs to the technical field of sealing materials, the fluororubber sealing material comprises the following components by weight: 100 parts of fluororubber, 5-30 parts of a filler, 1.0-1.8 parts of a vulcanizing agent, 0.2-1.0 part of a vulcanization accelerator, 0.2-1.0 part of a plasticizer, 3-12 parts of a stabilizer, and 0.2-1.2 parts of a release agent. According to the invention, a fluororubber composite formula is specially designed, and a fluororubber synthesis process is cooperatively controlled, such as a processing sequence and a feeding rate of materials and parameters such as internal mixing and open mixing temperatures, rotating speeds and the like, so that the fluororubber sealing material with better comprehensive performance is obtained, and when the fluororubber sealing material is applied to a sealing rubber strip of a hydrostatic pressure bursting test, standard requirements are met; and the tensile strength, the elongation at break and the compression permanent deformation are obviously improved.

The utility model discloses a pressing and fixing type friction resistance testing component for a film coating sample, which comprises a supporting seat, the supporting seat is movably connected with a height adjusting device, a supporting rod is arranged at the upper end of the supporting seat, a working rod is arranged at the lower end of the supporting rod, a friction head is arranged at the lower end part of the working rod, and the friction head is pressed on the film coating sample during working. The coating sample reciprocates left and right, and the friction head is used for carrying out friction resistance test on the coating sample; an outer thread is further arranged on the outer diameter of a rod body of the working rod, a corresponding threaded sleeve is sleeved on the outer thread, a lifting sleeve is further sleeved on the working rod, and the lifting sleeve is correspondingly driven to move up and down on the working rod by screwing the threaded sleeve. According to the device, the lifting sleeve is arranged on the working rod, the spring rod is arranged between the lifting sleeve and the supporting seat, and the working rod is pressed and fixed through the spring rod, so that the position of the working rod is fixed, position deviation is avoided during testing, and the testing precision and accuracy are effectively improved.

The invention relates to a multi-dimensional reinforced silane cross-linked chlorosulfonated polyethylene nano composite material as well as a preparation method and application thereof, and belongs to the technical field of high-performance special rubber composite materials. The technical scheme is as follows: the composite material comprises the following components in parts by weight: 100 parts of chlorosulfonated polyethylene, 3-15 parts of a compound silane crosslinking system, 5-30 parts of a multi-dimensional nano reinforced phase, 1-8 parts of a hyperbranched polymer modifier, 5-20 parts of an environment-friendly plasticizer, 0.1-2 parts of a catalyst, 10-60 parts of filler and 2-8 parts of a functional aid. The material is obviously superior to the prior art in the aspects of heat resistance grade, mechanical property, chemical medium resistance, electrical insulation characteristic, compression set and the like, and can be widely applied to the field of high-end equipment for extreme environments, such as nuclear power cables, deep sea oil exploitation, new energy automobiles, space flight and aviation, geothermal exploration and the like.

The invention discloses a closed-cell foam material for backpack equipment, the closed-cell foam material is composed of matrix resin and an elastomer component, the matrix resin is an ethylene-vinyl acetate copolymer in which the content of a vinyl acetate structural unit is 5%-15%; the closed-cell foaming material has the overall density of 0.05-0.08 g / cm < 3 >, and the average diameter of internal cells is not larger than 200 microns; the closed cell foam material exhibits a compression set rate of less than 5%. According to the closed-cell foaming material for the backpack equipment provided by the invention, light weight, high resilience and deformation resistance are realized through collaborative design of materials and a process.

The utility model discloses an O-shaped elastic sealing ring compression permanent deformation rate testing device, which belongs to the technical field of deformation rate testing and comprises a base, a compression groove and a measuring groove are processed at the top of the base, a testing clamp for placing a sealing ring for testing is arranged in the compression groove, and the testing clamp comprises a bottom plate. A positioning column is fixedly arranged in the center of the top of the bottom plate and sleeved with a pressing plate, a downward pressing mechanism is arranged above the pressing plate, a rotating table is arranged in the measuring groove, a groove matched with the bottom plate is machined in the top of the rotating table, and a measuring mechanism is arranged between the compression groove and the measuring groove. According to the utility model, the sealing ring is compressed by the test fixture, the thickness of the sealing ring is measured by the measuring mechanism to calculate the compression permanent deformation rate, the structure is simple, the operation is very fast, and the test fixture and the base are detachable, so that the test fixture and the base can be conveniently and rapidly replaced by a worker, and a plurality of sealing rings can be tested at one time, thereby improving the working efficiency.