82 results about "Sliding wear" patented technology

The invention relates to a sliding wear performance evaluation method of a sliding bearing, a sliding wear testing machine and application. The method comprises the following steps: acquiring initial-state benchmark characterization of a sliding bearing sample, placing the sliding bearing sample at a test station of the sliding wear testing machine, outputting lubricating oil, collecting a process oil sample, and acquiring final-state characterization of the sliding bearing sample after the test is completed; on the basis of initial state benchmark characterization, process oil sample analysis data, final state characterization and working condition parameters applied by a sliding wear testing machine, the wear stage and the wear mechanism are analyzed, and the sliding wear performance of the sliding bearing is evaluated; a sliding shaft supporting module, a rotating power module, an oil supply lubricating module and a radial load pressurizing module are arranged on the testing machine matching platform; the method is applied to wear resistance evaluation of sliding bearings prepared by adopting different processes. According to the invention, the core working condition of the actual dynamic pressure bearing is accurately reproduced, the stability and durability of the test system are improved, and the occurrence, development and evolution process of wear is visualized and quantifiable.

The invention relates to the technical field of cable manufacturing, in particular to a cable for an electric vehicle charging pile and a manufacturing process of the cable. The cable comprises a cable body, an electric charging pile is fixedly connected to the end of the cable body, a charging gun is fixedly connected to the end, away from the electric charging pile, of the cable body, a plurality of protection assemblies are detachably connected to the surface of the cable body in a sleeving mode, and each protection assembly comprises a long-strip-shaped suction cup. The long-strip-shaped suction cups are arranged on the periphery of the circular-ring-shaped connecting sleeve in an annular array, it is guaranteed that when the cable is dragged in any direction, the suction cups in the corresponding directions can make contact with the ground preferentially, dragging stress is dispersed in the long-strip direction, cable damage caused by local friction concentration is avoided, the inner diameter of the circular-ring-shaped connecting sleeve is matched with the outer diameter of the cable, and therefore the cable is prevented from being damaged. A stable protection layer is formed through uniform wrapping, and sliding abrasion caused by looseness of a traditional protection structure is avoided.

The utility model is suitable for the technical field of multi-layer composite product structures, and provides an under-rail reinforced rubber base plate of a multi-layer composite structure and application of the under-rail reinforced rubber base plate. A plurality of grooves which intersect in the inclined direction are formed in the pillow touching layer and the rail touching layer, the multiple upper grooves which intersect in the inclined direction jointly form network grooves, and the network grooves divide the pillow touching layer and the rail touching layer of the base plate into a plurality of shoulder pads. Therefore, the reinforced under-rail base plate can enable stress to be uniformly dispersed, fatigue recovery is more than two times faster than that of an existing base plate, the rhombic groove channels of the base plate are opened, and the ventilation, cooling and drainage speed is high. And meanwhile, the rhombic shoulder pad of the base plate can effectively restrain sliding abrasion and tearing caused by impact stretching of the base plate.

This application relates to the field of water conservancy engineering and discloses a lifting gate for water conservancy projects, including a base, a frame, a gate body, and a drive mechanism. It also includes a connecting pipe, one end of which passes through the middle of the gate body, and the other end is fixedly connected to a sleeve. A piston cylinder is sealed inside the sleeve. A telescopic rod is mounted on the top of the gate body via a mounting bracket. A connecting plate is fixedly mounted on the telescopic end of the telescopic rod. The top of the balance pipe is fixedly connected to the connecting plate. This device uses a baffle plate to block water entering the semi-circular area, thereby reducing the difference in water level on both sides of the gate body. This design can reduce or offset the water pressure on both sides of the gate body, significantly reducing sliding wear and frictional resistance between the gate body and the chute during relative movement. It also reduces the power consumption of the drive mechanism, making it highly practical.

Provided are: a liquid crystalline resin composition having good flowability, which provides a molded body having good and excellent balance between low dust generation, low sliding wear, low warpage, and mechanical strength; and a camera module using the liquid crystalline resin composition. This liquid crystalline resin composition contains (A) a liquid crystalline resin, (B) a plate-like filler, and (C) an olefin polymer, the component (B) having a median diameter of 8-50 [mu] m, the component (C) containing an epoxy group-containing olefin polymer, the content of the component (A) being 54-87% by mass, the content of the component (B) being 10-40% by mass, and the content of the component (C) being 2.75-6.00% by mass with respect to the entire liquid crystalline resin composition, the content of the epoxy group is at least 0.003 mass% and less than 0.048 mass%.

The invention discloses a wear-vibration coupling modeling method and device for a roller linear guide rail pair system, and the method comprises the steps: dividing the movement process of a roller into an LC stage and two transition stages according to the contact load, deformation state and wear mechanism difference of the roller in a sliding block track; respectively establishing a sliding wear model and an impact-sliding composite wear model, and constructing a non-uniform wear depth expression taking space coordinates as input; the multi-state contact behavior is described by introducing roller compression deformation and contact angle change, and the actual contact area under different contact states is determined based on the Hertz contact theory; in combination with roller operational analysis and a coordinate transformation relation, mapping of the abrasion depth among a roller coordinate system, a sliding block coordinate system and a guide rail coordinate system is achieved, and the abrasion effect of each roller is accumulated through a time discretization method; a five-degree-of-freedom nonlinear dynamic model is introduced, coupling analysis of pretightening force degradation and vibration response is achieved, and dynamic performance changes of the guide rail system in long-term operation are predicted.

A wear element or wear pad 4 is for placement between a first element 2 of a telescopic assembly (500 figure 5) such as a telehandler boom and a second element 4 of the telescopic assembly (500 figure 5). The second element 4 is configured to slide relative to the first element 2. The wear element 4 comprises a first surface 16 comprising an attachment portion 22, 24 for attachment via an attachment feature 8, 12 to the first element 2 of the telescopic assembly (500 figure 5), a second surface 18 parallel to the first surface 16 for abutting the second element 4 of the telescopic assembly (500 figure 5) and a magnetic element 14 located between the first surface 16 and the second surface 18 at a location fixed relative to the attachment portion 22, 24. In use, with the wear element 4 located between the first element 2 and the second element 4 in an event that the attachment portion 22, 24 is proximate the attachment feature 8, 12 of the telescopic assembly (500 figure 5), the magnetic element 14 is proximate a magnetic sensor 10 located in the first element 2 of the telescopic assembly (500 figure 5) and in an event that the attachment portion 22, 24 moves away from the attachment feature 8, 12 of the telescopic assembly (500 figure 5), the magnetic element 14 moves away from the magnetic sensor 10. This may happen should the wear element 4 become displaced.

The utility model discloses a knitting machine spindle guide track supporting device which comprises a knitting machine installation bottom plate, at least four spindle guide rails are evenly installed on the upper portion of the knitting machine installation bottom plate through bolts, and cycloid mechanism installation grooves are formed in the portions, among the spindle guide rails, of the knitting machine installation bottom plate. A first track groove is formed in the upper portion of the outer side of the spindle guide rail, a first baffle is arranged at the top of the first track groove, and a first transverse pulley track is defined by the first track groove and the first baffle. In order to further slide the knitting spindle, a second track groove is formed in the inner side of the spindle guide rail, and the second track groove and a transverse pulley on the inner side of the knitting spindle are installed in a sliding mode. The supporting force of the knitting spindle is dispersed in the sliding process, the movement load of the knitting spindle is increased, and sliding abrasion between the knitting spindle and the spindle guide rail is reduced.

The invention relates to the technical field of grinding rod performance testing, and specifically proposes a grinding rod performance testing device, comprising a sliding wear device assembled on the surface of a test bench, an abrasive wear mechanism fixedly assembled on the surface of the test bench, and a detection frame assembled on the surface of the test bench and capable of moving. The invention realizes separate working condition simulation tests through the sliding wear mechanism, the rolling wear mechanism and the abrasive wear mechanism, and a movable detection bench is assembled on the test bench, on which rolling wear working condition and abrasive wear working condition simulation are performed. During the movement, the rolling wear working condition simulation and the abrasive wear working condition simulation will generate a repeated simulation area on the surface of the grinding rod, and the area is the composite simulation working condition area. Different working conditions can be simulated on the same grinding rod, so that the comparison effect under different working conditions is more obvious, and the composite working condition simulation is achieved on the same grinding rod, so that the test result is closer to the actual use result.

The present application relates to the field of testing machines, and specifically discloses a corrosion wear fatigue testing machine for electrical fittings, which includes a workbench and an environmental chamber fixedly mounted on the workbench, the upper cover of the environmental chamber being provided with a top cover, the bottom of the environmental chamber being open and connected to a collection tank; an arc-shaped guide rail being fixedly mounted on the workbench outside the environmental chamber, a pendulum being swingably mounted on the workbench in a horizontal plane, one end of the pendulum being slidably mounted in the arc-shaped guide rail, the other end being located in the environmental chamber and being connected to a first fitting to be tested, the first fitting to be tested being hung with a second fitting to be tested, a driving mechanism for driving the pendulum to swing, and a tensioning mechanism for applying a load to the second fitting to be tested being mounted on the workbench; the testing machine also includes a spray mechanism for sandblasting or spraying the fitting to be tested. The present application can simulate the relative sliding wear, stress, and corrosion conditions of fittings in all environments, thereby effectively evaluating the wear and corrosion resistance of connecting fittings under complex service conditions.

The utility model relates to the technical field of rail transit measurement, in particular to a tool for measuring the abrasion height of a pantograph carbon contact strip. The pantograph carbon slide plate abrasion height measuring tool specifically comprises a caliper support, a graduated scale, a gradienter and a locking piece. The caliper support is provided with a sliding groove in sliding connection with the graduated scale, the gradienter is fixedly connected with the caliper support, the graduated scale is provided with an open hole for the locking piece to stretch in, and the locking piece abuts against or is separated from the caliper support. When the measuring tool is used, the measuring tool is firstly placed on a carbon slide plate, the lowest point of the carbon slide plate is found, and the gradienter is in a completely horizontal position; the lowest point of the carbon slide plate and the lower edge of the aluminum substrate are clamped by using a graduated scale and a caliper support, so that the abrasion height of the carbon slide plate can be measured; finally, the locking piece is tightened, and the numerical value is read. The utility model has the advantage of small error of measured data.

The application discloses a kind of gradient nanostructure sliding wear high-efficiency calculation method, comprising: obtaining gradient nanostructure grain size parameter and load parameter, determine the material parameter at different depths;Establish size-dependent crystal plasticity constitutive model and dislocation density evolution model and cluster homogenization model;Establish three-dimensional friction contact finite element model, calibrate constitutive model parameters and friction and wear parameters;In three-dimensional friction contact finite element model, calculate the results such as contact pressure, relative slip, cumulative plastic strain, dislocation density;Based on energy dissipation theory, calculate the wear depth increment of each contact node.The application can be coupled in the same calculation framework gradient grain size, crystal plastic deformation, dislocation density evolution, friction contact and surface wear evolution, obtain the wear depth, contact pressure, cumulative plastic strain, dislocation density of gradient nanostructure under reciprocating sliding load, and can be used for comparing the wear resistance under different surface grain size.

This invention relates to the field of tire rubber performance testing technology, and more particularly to a method and system for evaluating and predicting the sliding wear of tread rubber under high-torque acceleration / braking conditions in new energy vehicles. The invention measures the wear amount W at a slip ratio s=10 under the same load, speed, temperature, and abrasive conditions on an improved Lambourn slip wear testing machine. 10 W 15 W 20 The slip sensitivity coefficient K was obtained by linear fitting the W-s relationship using the least squares method. slip and intercept b. Based on high slip wear and K slip Constructing evaluation index I for high torque operating conditions HT And by calibrating the model, I HT This is mapped to wear level or equivalent wear mileage. Compared with single slip rate evaluation, this invention can characterize the sensitivity of wear as slip rate increases, enhance the ability to distinguish high slip events, improve the consistency between indoor evaluation and actual vehicle wear, and is applicable to formula screening, process window determination, and mileage prediction.

The utility model relates to the technical field of automobile connecting rods, and discloses a wear-resistant aluminum alloy automobile connecting rod which comprises a connecting rod body, the upper side of the connecting rod body is fixedly connected with a connecting rod large head, the lower side of the connecting rod body is fixedly connected with a connecting rod small head, and the upper side of the connecting rod large head is provided with a connecting rod cover. An anti-abrasion assembly is arranged on the inner side of the large connecting rod head and the inner side of the connecting rod cover, a first through hole is formed in the large connecting rod head, and a second through hole is formed in the small connecting rod head. The anti-abrasion assembly comprises protrusions, and the protrusions are fixedly connected to the inner walls of the connecting rod large head and the connecting rod cover. The protrusions on the inner walls of the connecting rod large head and the connecting rod cover increase friction force with a crankshaft and prevent relative sliding abrasion, the abrasion-resistant coatings are directly resistant to abrasion, the coatings in the shallow grooves can supplement the abraded abrasion-resistant coatings, self-repairing is achieved, the heat dissipation fins of the connecting rod body increase the heat dissipation area, the situation that the performance of the connecting rod is reduced due to high temperature is avoided, and the service life of the connecting rod is prolonged. And stable operation of the engine is ensured.

The invention discloses a macro-micro multi-scale fatigue life calculation method of an engine main shaft, which comprises the following steps: constructing an interface friction slip model based on slip wear of a SiC / Ti composite material interface under different peak loads; based on an interface friction slippage model, simulating a performance degradation rule of the SiC / Ti composite material under different temperature fatigue spectrum loads; the method comprises the following steps: performing parametric modeling on an aero-engine main shaft to obtain a multi-scale model, introducing a performance degradation rule of a SiC / Ti composite material into the multi-scale model, and calculating the fatigue life of the aero-engine main shaft by applying a SiC / Ti macro-micro fatigue progressive damage method. According to the method, the peak load is considered, the interface friction slippage model is improved, the performance degradation rule of the SiC / Ti composite material under different temperature fatigue spectrum loads is simulated, and the fatigue life of the aero-engine spindle can be predicted more accurately.

The present invention provides a posture-decoupled multi-axis high-speed hybrid robot without telescopic rods, which belongs to the technical field of robots; the robot comprises a frame, a moving platform, five motors, an end turntable, an end actuator, and a first, second, third, and fourth branches connected in parallel between the frame and the moving platform; the first branch is connected to a flange shaft, a short connecting rod 1, a long connecting rod 1, a long connecting rod 2, a short connecting rod 2, a U-shaped fork, a large pulley, and a small pulley in sequence from the frame to the moving platform; the second, third, and fourth branches have exactly the same structure, and are all connected to an active arm and a four-ball joint parallelogram mechanism in sequence from the frame to the moving platform; the robot of the present invention does not have a complex transmission structure, and through a special branch arrangement, interference of rods is effectively avoided; since it does not contain a telescopic cylinder, sliding wear is avoided, and high-speed handling and assembly are facilitated.

The invention provides a liquid crystal resin composition having good fluidity and a camera module using the same. The liquid crystal resin composition provides a molded body having excellent balance in terms of low dust generation, low sliding wear, low warpage, and suppression of inward tilt deformation. This liquid crystalline resin composition contains (A) a liquid crystalline resin, (B) a particulate filler, (C) a plate-like filler, and (D) an olefin polymer, the component (B) having a median diameter of 0.3-8 [mu] m, the component (C) having a median diameter of 10-50 [mu] m, the component (D) containing an epoxy group-containing olefin polymer, the content of the component (A) being 52-82 mass% with respect to the entire liquid crystalline resin composition, and the content of the component (B) being 50-70 mass% with respect to the entire liquid crystalline resin composition. The content of the component (B) is 2.5-35% by mass, the content of the component (C) is 5-35% by mass, the total content of the component (B) and the component (C) is 15-45% by mass, the content of the component (D) is 1.50-6.00% by mass, and the content of the epoxy group is 0.003-0.050% by mass.

The utility model discloses an aspheric lens mould pressing mould which comprises an upper mould and a lower mould, the upper mould comprises an upper main body part located in the middle and upper hanging tables located on the two sides, and the tops of the upper hanging tables incline downwards; the lower die comprises a lower main body part located in the middle and lower hanging tables located on the two sides, and the lower hanging tables and the lower main body part are of a split structure. The tops of the upper hanging tables incline downwards, so that the force bearing area of the upper die is located on the upper main body part, and the stress of the upper hanging tables on the two sides can be effectively reduced. The lower hanging table and the lower main body part are of a split structure, and compared with a traditional integrated structure, a force bearing area of the lower die can be located on the lower main body part, and the stress of the lower hanging table can be effectively reduced. And the lower hanging table can also play a role of an extension structure, so that the limiting sleeve can be arranged on the lower hanging table, the limiting sleeve is prevented from being in direct sliding contact with the equipment forming plate, and the problem of sliding abrasion and aging of the limiting sleeve can be solved.

The invention relates to the technical field of bridge and tunnel engineering, in particular to a high polymer elastic and tough body seamless expansion joint structure and a preparation method thereof, and the high polymer elastic and tough body seamless expansion joint structure comprises a notch formed by two supporting bodies; at the bottom of the notch, the two supporting bodies are connected through a seam crossing plate with the top side and the bottom side both in a tooth shape, and the tooth section is in a trapezoid shape. The inner wall of the notch is coated with a macromolecular interface binder; the seam crossing plate, the two supporting bodies and the temperature change active compensation layer form an interlocking structure; the top of the temperature change active compensation layer is sequentially provided with a phase change toughening synergistic bonding layer, a high polymer elastic toughening body and a resin anti-sliding wear-resistant layer from bottom to top; the Ti-Ni shape memory alloy wire is combined with the nano-modified asphalt-epoxy resin interpenetrating network, and is matched with the trapezoidal tooth-shaped stainless steel-silicon rubber joint crossing plate and the macromolecular interface binder, so that active deformation compensation is realized, and the service life of the structure is prolonged.

The invention discloses a method for forecasting the abrasion loss of a six-rack ultra-high strength steel cold rolling working roll. The method comprises the steps that rolling data of six racks are collected; the sliding abrasion loss and the rolling abrasion loss between the working rollers of the racks and the strip steel and between the working rollers of the racks and the middle rollers are calculated; correcting by comprehensively considering the influence of the temperature on the hardness of the roller; and outputting the abrasion loss of each rack. According to the invention, the wear condition of the working roll of each rack can be visually presented, the roll body needing to be replaced can be accurately positioned, the consumption cost is effectively reduced, reliable data support is provided for field staff, the stability and the high efficiency of the cold rolling process are ensured, the product quality problem caused by wear is avoided, the rejection rate is reduced, and the overall production efficiency is improved.

The application discloses a controllable magnetic field and atmosphere multi-mode fretting-sliding wear test device and method, and belongs to the technical field of material friction and wear performance test. The device comprises a magnetic field generating module, a magnetic attraction force closed-loop regulation and control system, a friction and wear test platform and an atmosphere environment control mechanism. The friction and wear test platform comprises a fretting friction and wear module and a sliding friction and wear module. The fretting friction and wear module and the sliding friction and wear module are respectively used for fretting friction and wear test and sliding friction and wear test of the sample to be tested. The atmosphere environment control mechanism is used for controlling the atmosphere environment of the sample to be tested. The application can solve the technical bottleneck that the traditional device cannot dynamically match the magnetic field and mechanical parameters, lacks multi-mode friction and wear test simulation and controllable atmosphere environment, significantly improves the reliability and applicability of test data, and provides technical support for the research on material friction and wear behavior under a complex magnetic field environment.

The utility model discloses a double-feeding plastic pulverizer which comprises a pulverizer body, a cover plate is connected to the pulverizer body in a sliding and penetrating mode, feeding cylinders are symmetrically and fixedly connected to the cover plate in a penetrating mode, auxiliary mechanisms used for removing iron in plastic particles are symmetrically arranged in the pulverizer body, and each auxiliary mechanism comprises a magnet plate, a supporting plate, a connecting column and a material guiding plate. The magnet plate is located at the bottom of the feeding cylinder and used for conducting iron attraction operation on the interiors of the plastic particles, the supporting plate is located on the side portion of the magnet plate, the connecting column is slidably arranged on the side portion of the smashing machine body, and the material guiding plate is located in the feeding cylinder. According to the plastic particle feeding device, the feeding cylinder, the magnet plate, the supporting plate, the connecting column, the connecting plate, the material guiding plate, the sliding plate and the limiting block are matched with one another, the material guiding plate conducts plastic particle discharging and flow dividing on the interior of the feeding cylinder, and then the magnet plate adsorbs iron impurities in plastic particles; and therefore, the iron impurities in the plastic impurities can be removed conveniently.

The invention relates to the technical field of plate erecting machines, in particular to a plate erecting machine for mounting an ALC spliced large plate. According to the technical scheme, the device comprises a rack, a supporting plate, a sliding plate and a clamping mechanism, and the innovative core is that a plate positioning part is additionally arranged. According to the component, the traction rope is synchronously wound and unwound through the driving module, the clamping seats connected to the two ends of the ALC plate are controlled to be synchronously tightened, and therefore the longitudinal position of the plate is forcibly centered and locked in the horizontal state, and it is ensured that the clamping height is consistent every time. The bottom of the clamping seat is provided with a rolling body for self-adaptive centering, and the clamping seat can adapt to different plate thicknesses through the distance adjusting assembly. The device is further provided with an installation distance adjusting mechanism to adapt to different plate lengths and an anti-abrasion displacement mechanism to reduce sliding abrasion of the plates. According to the clamping and positioning device, clamping and positioning precision and automation are achieved, and on the premise that installation nodes are prevented from being blocked, the repeated precision and overall efficiency of ALC plate installation are greatly improved.

The invention relates to an experimental device for the impact and wear resistance of a semi-autogenous mill lining plate, which comprises a lifting device, a ball falling device, an inclined test block and a vibration feeder, and is an impact and wear resistance experimental device capable of really simulating the actual service condition of the semi-autogenous mill lining plate. The combined action of steel balls and grinding materials in the semi-autogenous mill can be truly represented, composite abrasion simulation of steel ball impact, sliding abrasion and grinding material flowing action is achieved through the multifunctional integrated design of the device, the steel balls and the grinding materials can be recycled through an inclined ball recycling baffle, a complex mechanical pushing device is not needed, and the device is simple in structure and convenient to operate. Through combination of the force sensor and the laser scanner, high-precision impact and abrasion data are provided, result analysis is facilitated, impact energy, impact frequency, inclination angle and dynamic displacement speed can be flexibly adjusted, various experiment requirements are met, and a scientific basis is provided for model selection and optimization of lining plate materials.

The utility model discloses a cervix uteri sampling swab packaging device which comprises a machine frame. The multiple elastic pressing devices are connected with the rack in a sliding and penetrating mode; the lifting device is mounted at the bottom of the rack, and the lifting device is used for driving the elastic pressing device to do lifting motion; the plastic packaging device is connected with the elastic pressing device in a sliding and penetrating mode, and the plastic packaging device is used for heat sealing of the packaging paper; the bearing table is mounted on the rack, and the position of the bearing table corresponds to that of the plastic packaging device; and a guide roller. By means of the arrangement mode that the elastic pressing device and the lifting device are matched, more uniform and stable pressure distribution can be provided in the heat sealing process through elastic supporting of the elastic pressing device, the phenomenon of poor heat sealing caused by too large or too small pressure is avoided, and therefore the firmness and the sealing performance of a seal are remarkably improved, and the sealing quality is improved. The safety of the sampling swab is ensured, and the risk of operators in the heat sealing process is reduced.

The application relates to the technical field of valve sealing, and discloses a self-sealing anti-blocking safety valve, which comprises a valve frame, the upper part and the bottom part of the valve frame are respectively connected with an upper valve port and a lower valve port, further comprises a slide valve piece for controlling the opening and closing of the flow channel of a valve body, and a bidirectional sealing piece for controlling the flow channel sealing of the upper valve port and the lower valve port. The self-sealing anti-blocking safety valve is characterized in that the slide valve piece and the bidirectional sealing piece are combined with each other, solid medium cannot enter the valve cavity during the whole operation process of the valve, the lower sealing pair of the valve is completely hidden and is not impacted by the medium at any position, so that the service life of the valve is greatly prolonged. Meanwhile, the cylindrical rubber sleeve is in contact with the valve port for sealing, the whole valve body can automatically control the random rotation of the rubber sleeve, when the valve is closed, different contact surfaces can be controlled to abut against the position of the valve port, so that the valve is closed, the sliding wear of the valve is reduced, the contact abutment sealing effect is maximally maintained, and the service life of the valve is prolonged.

This invention discloses a multifunctional mechanical testing device for marine pipelines, belonging to the field of mechanical performance testing for marine engineering pipelines. It includes a horizontally arranged main load-bearing frame, two lifting gantry frames spanning above the main load-bearing frame, and modularly detachable and selectively assembled functional components for axial tension / compression, four-point bending, radial extrusion, and external wear testing. The main load-bearing frame adopts a double-layer welded rigid beam-column structure, equipped with sliding guide rails, adjustable flanges, and internal pressurization ends. The lifting gantry frames use a combination structure of triangular supports and pre-embedded box-shaped steel bases, exhibiting excellent overall torsional and overturning resistance. All testing functional components are structurally universal and can be quickly disassembled and replaced. It can simulate single working conditions such as axial tension / compression, four-point bending, radial extrusion, and external wall sliding wear, as well as tension-bending coupled composite load conditions, on the same platform. This invention features high modularity and strong adaptability to pipe diameter and length, improving testing efficiency and reducing equipment purchase and site usage costs.

The present invention discloses a fixture for testing the wear of contact lines and carbon slide plates, and a clamping method thereof, comprising a fixture disk having a plurality of guide grooves arranged along its circumferential array, a fixture block being slidably connected in each guide groove, a carbon slide plate sample being clamped between each fixture block and the fixture disk, a wedge block being embedded between the plurality of fixture blocks, a main shaft being installed in the fixture disk, the end of the main shaft extending into the wedge block, a gas-electric slip ring being provided at the top of the wedge block, a gas-electric slip ring stud being passed through the inside of the gas-electric slip ring, the gas-electric slip ring stud extending into the inside of the main shaft and being threadedly connected to the main shaft. After the fixture of the present invention completes clamping of the carbon slide plate, it rotates as a whole to test the high-speed rail contact line sample. The fixture block further locks the carbon slide plate under the action of centrifugal force, thereby preventing it from loosening. At the same time, the spring pins installed in the seam holes of the carbon slide plate and the spring pressure plate between the fixture block and the fixture block improve the reliability of the contact.

The invention relates to the technical field of valve sealing, and discloses a self-sealing anti-blocking safety valve which comprises a valve frame, and the upper portion and the bottom of the valve frame are connected with an upper valve port and a lower valve port correspondingly. The slide valve part is used for controlling the opening and closing of a flow channel of the valve body; and the two-way sealing piece is used for controlling flow channel sealing of the upper valve port and the lower valve port. According to the self-sealing anti-blocking safety valve, through mutual combination of the sliding valve piece and the two-way sealing piece, solid media cannot enter the valve cavity in the whole operation process of the valve, a lower sealing pair of the valve is completely hidden at any position and is not impacted by the media, and therefore the service life of the valve is greatly prolonged. Meanwhile, the cylindrical rubber sleeve and the valve port are used for contact sealing, the whole valve body can automatically control random rotation of the rubber sleeve, and therefore when the valve is sealed, different contact faces can be controlled to abut against the positions of the valve port, sealing is achieved, sliding abrasion of the valve is reduced, the contact abutting sealing effect is kept to the maximum degree, and the service life of the valve is prolonged.

A wear element is for placement between a first element of a telescopic assembly and a second element of a telescopic assembly. The second element is configured to slide relative to the first element. The wear element comprises: a first surface comprising an attachment portion for attachment via an attachment feature to the first element of the telescopic assembly; a second surface parallel to the first surface for abutting the second element of the telescopic assembly; and a magnetic element located between the first surface and the second surface at a location fixed relative to the attachment portion. In use, with the wear element located between the first element and the second element: in an event that the attachment portion is proximate the attachment feature of the telescopic assembly, the magnetic element is proximate a magnetic sensor located in the first element of the telescopic assembly; and in an event that the attachment portion moves away from the attachment feature of the telescopic assembly, the magnetic element moves away from the magnetic sensor.