Abrasion test device for reciprocating dynamic seal of actuator cylinder

Abstract

The invention discloses a wear test device for reciprocating dynamic sealing of an actuator cylinder, and belongs to the technical field of actuator cylinder sealing wear test equipment.The wear test device comprises a main frame body and a test mechanism movably connected to the main frame body, a replaceable to-be-tested actuator cylinder structure is arranged on one side of the main frame body, and the test mechanism comprises a moving rod; the upper end and the lower end of the moving rod are provided with a limiting assembly and a counterweight assembly respectively, the moving rod is provided with a connecting piece, and the connecting piece is hinged to one end of a piston rod in the actuator cylinder structure to be tested. According to the method, the conventional motion of the output end of the actuator cylinder in a static state and the external non-axial acting force borne by the output end of the actuator cylinder in a dynamic state can be simulated, the reliability of the sealing ring in actual work can be comprehensively evaluated through combination of the two, verification is carried out from multiple dimensions, potential risks can be found, and the requirements of safety specifications in the fields of aviation, industry and the like are better met.

Description

TECHNICAL FIELD

[0001] The present application relates to testing or analyzing materials by means of determining the chemical or physical properties of the materials, and more particularly, it relates to the technical field of actuator cylinder sealing wear testing equipment, and particularly relates to a wear test device for actuator cylinder reciprocating dynamic sealing. BACKGROUND

[0002] An actuator cylinder is an actuating element that converts fluid pressure (hydraulic or pneumatic) into linear mechanical motion, widely used in aerospace, engineering machinery, automobiles and other fields. Its core function is to drive the piston to move by fluid (such as hydraulic oil or compressed air), convert fluid energy into piston rod thrust or pull force, and drive the load to complete linear reciprocating action (such as airplane cabin door opening and closing, landing gear retraction and extension, machine tool workbench movement, etc.). It mainly includes cylinder, piston, piston rod, dynamic sealing ring and end cover. The dynamic sealing ring, as a sealing element, is installed between the piston and the inner wall of the cylinder to prevent fluid leakage during piston reciprocation.

[0003] The dynamic sealing ring is deformed by pre-compression and fluid pressure, tightly adheres to the inner wall of the cylinder and the surface of the piston, and forms a dynamic seal. It is the core component of the actuator cylinder, and its performance directly affects the reliability and system safety of the actuator cylinder. For example, in a hydraulic system, dynamic sealing failure can cause hydraulic oil leakage, insufficient actuator cylinder thrust (such as airplane cabin door cannot be closed in place), and even cause system pressure to drop suddenly, resulting in safety accidents. In a pneumatic system, leakage can cause the actuator cylinder to respond slowly, affecting the accuracy of equipment operation. When the piston reciprocates, the sealing ring rubs against the inner wall of the cylinder, causing the lip to wear and the material to age. In order to understand the specific degree of wear and ensure safety in use, wear test of the actuator cylinder is needed.

[0004] In the existing reciprocating dynamic seal wear test device of the actuator cylinder, for example, the technical structure of the application number 201911227542.1 application document, including fixing device, connecting support device, loading test device and detection device, the fixing device includes test table bottom plate, first fixed tool, second fixed tool and third fixed tool, the connecting support device includes rolling bearing, connecting tool, guide rail, second ear ring and first fixed pin, the loading servo cylinder is installed between the first fixed tool and the connecting tool, the guide rail is symmetrically installed between the second fixed tool and the third fixed tool, the connecting tool is installed on the guide rail through the rolling bearing, the loading test device includes loading servo cylinder, hydraulic cylinder tool, oil pipe, valve block, first ear ring and second fixed pin, the detection device includes force sensor, temperature sensor and pressure sensor, the hydraulic cylinder tool is installed between the third fixed tool and the connecting tool through the force sensor, the first ear ring and the second fixed pin, the device mainly simulates the cylinder of the actuator cylinder in the static state, tests the wear degree by the linear reciprocating movement of the piston rod, and can only test the wear of the sealing structure under the axial force of the piston rod. However, in the actual use process of the actuator cylinder, the cylinder is not always in a static state, and the cylinder often deflects as a whole with the movement of the output end (at this time the cylinder is in a dynamic state), and the internal sealing structure will be subjected to non-axial force, for example, the landing gear door needs to rotate around the hinge when closing, and the actuator cylinder needs to provide linear thrust, the actuator cylinder adopts a hinged + connecting rod mechanism, one end of which is fixed to the fuselage, and the other end is connected to the door through a connecting rod, when the piston rod is extended, the actuator cylinder rotates around the fixed point to push the door to close along the circular arc track, and the spoiler needs to be deflected upward when it is unfolded to increase the resistance, the actuator cylinder controls its movement by hinged installation, one end of the actuator cylinder is fixed to the upper surface of the wing, and the other end is connected to the spoiler, when the piston rod is extended, the actuator cylinder rotates around the installation point to push the spoiler to lift up around the hinge shaft, and so on, so when the actuator cylinder performs these actions, the internal dynamic seal ring will be subjected to non-axial force of the piston rod due to the deflection of the whole, but the current test device cannot simulate the test of the non-axial force of the dynamic seal ring to provide effective test data for better evaluation of the reliability and durability of the dynamic seal ring. SUMMARY

[0005] The technical scheme of the present application solves the technical problem that the prior art solution is too single, and provides a solution significantly different from the prior art, which determines the chemical or physical properties of the material to test or analyze the material, belongs to the actuator cylinder sealing wear test device, mainly provides a kind of wear test device for reciprocating dynamic seal of actuator cylinder, to solve the technical problem that the current test device can only simulate static state, test the wear of sealing structure under the axial force of piston rod, and cannot simulate the test of non-axial force of sealing ring under dynamic state.

[0006] The technical scheme adopted by the present application to solve the above technical problems is: A kind of wear test device for actuator reciprocating dynamic seal, including main frame body, and the test mechanism of movable connection on main frame body, the mounting hole of one side of main frame body is rotatably connected with connecting shaft and mounting plate on connecting shaft, the lower side of mounting plate is provided with the replaceable actuator structure to be measured, and actuator structure to be measured includes cylinder, piston rod, piston body and dynamic seal ring on piston body, the test mechanism includes moving rod, the upper end of moving rod is provided with the limiting component of control moving rod rotation or translation, the lower end of moving rod is provided with the counterweight assembly of adjustable weight, connecting piece is arranged on moving rod, and one end of piston rod is hinged with connecting piece.

[0007] Preferably, the connecting piece and the moving rod are connected by bolts; And / or, the connecting piece and the moving rod are slidingly connected.

[0008] Preferably, the limiting component includes a detachable housing, a limiting frame is arranged in the housing, a lifting block is arranged on the limiting frame, and the recess on the lifting block is slidingly connected with the protrusion on the limiting frame, the upper and lower sides of the lifting block are provided with tooth pieces, a rotating shaft and a positioning gear on the rotating shaft are arranged on the lower side of the outer wall of the housing, and the positioning gear is matched with the lower side of the lifting block. The tooth piece can limit the rotation of the rotating shaft.

[0009] Preferably, the rotating shaft is further provided with a U-shaped frame, and the U-shaped frame is connected with the upper end of the moving rod.

[0010] Preferably, the limiting component further includes an electric push rod, and the output end of the electric push rod is connected with one side of the lifting block.

[0011] Preferably, the counterweight assembly includes a counterweight frame, a plurality of counterweight blocks are arranged in the counterweight frame, the number of counterweight blocks can be increased or decreased, and a bayonet is arranged on the bottom of the outer wall of the counterweight frame.

[0012] Preferably, the upper side of the main frame body is provided with a top frame, a support frame and two pressing rods, the top frame and the support frame are detachably connected, the inner wall of the support frame is provided with a mounting groove, the mounting groove is provided with a positioning rack, and the upper side of the lifting block is provided with a tooth piece. The positioning rack and the tooth piece can limit the linear movement of the moving rod in horizontal direction, and the two pressing rods are distributed in parallel, and the two pressing rods press on the upper side of the outer wall of the housing.

[0013] Preferably, the bottom of the main frame body is provided with a height-adjustable foot cup and a connecting frame, an opening on the connecting frame is slidingly connected with a clamping block, and the clamping block is connected with the bayonet on the bottom of the counterweight frame.

[0014] Preferably, the upper side of the main frame body is further provided with a mounting opening, a damping simulation assembly is arranged on the mounting opening, the damping simulation assembly comprises a bent support, a screw rod and a nut seat on the screw rod are rotatably connected to the bent support, an L-shaped frame is arranged on one side of the outer wall of the nut seat, a pressure rod is arranged on the L-shaped frame, the pressure rod penetrates through the mounting opening, a damping block is arranged on the lower end of the pressure rod, and the damping block is located directly above the connecting shaft.

[0015] Preferably, a motor is mounted on the top of the bent support through bolts, and the output end of the motor is connected with the upper end of the screw rod.

[0016] Compared with the prior art, the present application has the following advantages: (1) The present application can test the reciprocating seal wear of the actuator cylinder by setting the main frame body, the top frame, the support frame, the pressure rod, the connecting shaft, the mounting plate, the connecting frame, the clamping block, the moving rod, the connecting piece, the bayonet, the testing mechanism and the limiting assembly, and the mutual cooperation between the shell, the limiting frame, the lifting block, the tooth piece, the positioning gear, the U-shaped frame, the electric push rod, the clamping block and the bayonet makes the moving rod only linearly move in the horizontal direction during the test and cannot be deflected, so that the conventional movement of the output end of the actuator cylinder under static state can be met, at this time, the sealing ring is only subjected to the axial force brought by the piston rod, the sealing and wear resistance of the sealing ring in the main load direction can be verified, the influence of the axial movement friction of the piston rod on the wear amount and the surface roughness change of the sealing ring lip can be determined, and the axial pre-compression amount and the balance between the sealing effect and the friction resistance can be adjusted; After the moving rod is reset, the clamping block is removed from the bayonet, and under the action of the electric push rod, the tooth piece on the upper side of the lifting block is clamped into the positioning rack, at this time, under the action of the output end of the actuator cylinder, the moving rod and the actuator cylinder itself will be deflected, so that the situation that the output end of the actuator cylinder is subjected to the external non-axial force under dynamic simulation can be met, the radial leakage, the sealing contact pressure distribution under eccentric state, and the piston rod movement sticking rate and the friction coefficient fluctuation range under non-axial load can be determined, the piston rod will bear the radial force and the bending moment when the actuator cylinder is deflected under complex working conditions, the reliability of the sealing ring under eccentric load can be verified, potential risks can be found, and the anti-failure ability of the sealing ring under complex load can be evaluated; The axial test is the basic performance verification of the dynamic sealing ring, and the non-axial test is aimed at the complex working conditions such as deflection of the actuator cylinder, and the combination of the two can comprehensively evaluate the reliability of the sealing ring in actual work, verify from multiple dimensions, and better meet the requirements of safety specifications in the fields of aviation and industry.

[0017] (2) The main frame body, the moving rod, the connecting piece, the counterweight frame and the counterweight block are arranged, the sizes of the axial and non-axial forces can be changed in static and dynamic test tests, the influence of the weight change on the dynamic sealing ring is determined and evaluated, the sealing consistency of the sealing ring in different load ranges is verified, and the sealing consistency of the sealing ring in different load ranges is verified; Axial load gradient change: the relationship between load and sealing pressure, axial weight increase → piston rod axial thrust / tension increase → sealing ring axial compression amount increase → sealing contact pressure rise, theoretically, the sealing performance is enhanced, but exceeding the threshold value will aggravate the wear, which can be used for simulating the axial load fluctuation of the cabin door actuating cylinder when the pressure difference inside and outside the cabin changes; Non-axial load gradient change: load eccentricity and stress concentration, non-axial weight increase → radial component / bending moment increase → one-sided extrusion stress concentration of the sealing ring → eccentric wear aggravation, the local wear depth of the lip of the dynamic sealing ring increases exponentially with the weight, which can be used for simulating the radial eccentric weight borne by the piston rod when the aircraft all-moving tail actuating cylinder is operated at a large deflection angle, and the critical load at which the sealing ring starts to have significant eccentric wear can be determined by comparing different eccentric weights, thereby providing a basis for installation accuracy; The essence is to verify the "strength-sealing-wear" coupling characteristics of the dynamic dynamic sealing ring by changing the load gradient, and the reliability of the data is further improved.

[0018] (3) The bending support, the screw rod, the nut seat, the L-shaped frame, the pressure rod, the damping block and the motor are arranged, the damping of the connecting shaft position of the to-be-tested actuating cylinder structure is realized, the situation that the friction coefficient rises due to the aging of the lubricating grease between the hinge pin shaft and the bushing of the actuating cylinder after long-term use can be simulated, and the three-layer coupling relationship of the mechanical conduction-contact stress-wear mechanism between the connecting shaft, the non-axial force and the sealing ring wear can be more effectively verified.

[0019] The present application will be explained in detail in combination with the drawings and specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a schematic view of the overall structure of the present application; Figure 2 It is a schematic view of the main frame body structure of the present application; Figure 3 It is a schematic view of the connection between the to-be-tested actuating cylinder structure and the test mechanism of the present application; Figure 4Structure schematic diagram of damping simulation assembly of the present application; Figure 5 Structure schematic diagram of limiting assembly of the present application; Figure 6 Structure schematic diagram of main frame body of the present application.

[0021] In the figure: 1, main frame body; 11, top frame; 111, mounting groove; 12, support frame; 13, pressing rod; 14, mounting port; 15, foot cup; 16, connecting shaft; 17, mounting plate; 18, connecting frame; 181, clamping block; 19, positioning rack; 2, testing mechanism; 21, moving rod; 22, connecting piece; 23, counterweight assembly; 231, counterweight frame; 232, counterweight block; 233, clamping port; 3, structure of to-be-tested actuating cylinder; 31, cylinder barrel; 32, piston body; 33, piston rod; 34, dynamic sealing ring; 4, damping simulation assembly; 41, bending support; 42, lead screw; 43, nut seat; 44, L-shaped frame; 45, pressure rod; 46, damping block; 47, motor; 5, limiting assembly; 51, housing; 52, limiting frame; 53, lifting block; 531, toothed piece; 54, rotating shaft; 55, positioning gear; 56, U-shaped frame; 57, electric push rod. DETAILED DESCRIPTION

[0022] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the accompanying drawings, in which several embodiments of the present application are given. However, the present application can be implemented in different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the present application more thorough and comprehensive.

[0023] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there can be a middle element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there can be a middle element. The terms "vertical", "horizontal", "left", "right", and similar expressions used herein are for illustrative purposes only.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0025] Embodiment one, please refer to the accompanying drawings Figures 1-6The utility model provides an abrasion test device for reciprocating dynamic seal of actuator cylinder, which comprises a main frame 1 and a test mechanism 2 movably connected to the main frame 1. A connecting shaft 16 and an installation plate 17 on the connecting shaft 16 are rotatably connected to a mounting hole on one side of the main frame 1. A to-be-tested actuator cylinder structure 3 is detachably arranged on the lower side of the installation plate 17. The to-be-tested actuator cylinder structure 3 comprises a cylinder 31, a piston rod 33, a piston body 32 and a dynamic seal ring 34 on the piston body 32. The test mechanism 2 comprises a moving rod 21. A limiting assembly 5 for controlling the rotation or translation of the moving rod 21 is arranged on the upper end of the moving rod 21. A counterweight assembly 23 with adjustable weight is arranged on the lower end of the moving rod 21. A connecting piece 22 is arranged on the moving rod 21, and the connecting piece 22 is hingedly connected to one end of the piston rod 33.

[0026] Through the above structure, the abrasion of the reciprocating dynamic seal of the actuator cylinder can be tested. The conventional movement of the output end of the actuator cylinder under static simulation can be met. The sealing and wear resistance performance of the seal ring in the main load direction can be verified. The influence of the axial movement friction (starting friction and dynamic friction) of the piston rod 33 on the wear amount (microscopic measurement) and surface roughness change of the seal ring lip can be determined. The axial pre-compression amount (usually 10% to 20% of the cross-sectional diameter of the seal ring) can be adjusted. The balance between the sealing effect and the friction resistance can be achieved. The simulation of the non-axial force on the output end of the actuator cylinder under dynamic simulation can be met. The radial leakage amount, the contact pressure distribution of the seal under eccentric state and the movement jamming rate and friction coefficient fluctuation range of the piston rod 33 under non-axial load can be determined. The piston rod 33 will bear radial force and bending moment when the actuator cylinder is deflected (such as landing gear door, full-actuated rudder surface and flap drive) under complex working conditions. The reliability of the seal ring under eccentric load can be verified through testing. The potential risks can be found. The anti-failure ability of the seal ring under complex load can be evaluated. The axial test is the basic performance verification of the dynamic seal ring 34, and the non-axial test is aimed at the complex working conditions such as deflection of the actuator cylinder. The reliability of the seal ring in actual work can be comprehensively evaluated by combining the two tests. The seal ring can be verified from multiple dimensions. The requirements of the safety specifications in the fields of aviation and industry can be better met.

[0027] The specific operation is as follows, static axial test: the to-be-tested actuator structure 3 is adjusted to a horizontal state through the connecting shaft 16, the motor 47 is turned on, the damping block 46 is driven to move downward and press on the connecting shaft 16, so as to avoid deflection of one end of the actuator, then the connecting piece 22 is locked on the moving rod 21 through a bolt, and the electric push rod 57 is turned on, the lifting block 53 moves downward, so that the tooth piece 531 on the lower side of the lifting block 53 is clamped on the positioning gear 55, the upper end of the moving rod 21 is prevented from deflecting and can only move linearly, then the opening on the connecting frame 18 is connected with the clamping opening 233 on the lower side of the counterweight frame 231 through the clamping block 181, so that the lower end of the moving rod 21 can stably slide, then the actuator is opened, the piston body 32 slides in the inner wall of the cylinder barrel 31, the piston rod 33 pulls the moving rod 21 to move reciprocatingly and linearly, the counterweight block 232 can be added into the counterweight frame 231 for comparison, after the test is completed, the movable sealing ring 34 is taken out, microscopic measurement is performed, and data is recorded; Dynamic non-axial test: the moving rod 21 is reset, the damping block 46 moves upward and is separated from the connecting shaft 16, so that the connecting shaft 16 can rotate, then the clamping block 181 is taken out of the clamping opening 233, so that the lower end of the moving rod 21 can swing, at the same time, the electric push rod 57 drives the lifting block 53 to move upward, the tooth piece 531 on the lower side of the lifting block 53 is separated from the positioning gear 55, the tooth piece 531 on the upper side of the lifting block 53 is clamped into the positioning rack 19, so that the rotating shaft 54 at the upper end of the moving rod 21 can rotate but cannot move linearly, then the bolt on the connecting piece 22 is unscrewed, then the actuator is started, the piston rod 33 pushes the moving rod 21 to deflect, at the same time, the cylinder barrel 31 deflects itself, the counterweight block 232 can be added into the counterweight frame 231 for comparison, after the test is completed, the movable sealing ring 34 is taken out, microscopic measurement is performed, and data is recorded.

[0028] Embodiment two, please refer to the accompanying drawings Figure 2 , 3As shown in FIGS. 4, the counterweight assembly 23 comprises a counterweight frame 231, a plurality of counterweight blocks 232 are arranged in the counterweight frame 231, the number of the counterweight blocks 232 can be increased or decreased, a bayonet 233 is arranged at the bottom of the outer wall of the counterweight frame 231, the load size can be changed in steps by changing the number of the counterweight blocks 232, which is beneficial to comparison data and improves the accuracy of the test, the upper side of the main frame body 1 is provided with a top frame 11, a support frame 12 and two pressing rods 13, the top frame 11 and the support frame 12 are detachably connected, a mounting groove 111 is arranged on the inner wall of the support frame 12, a positioning rack 19 is arranged in the mounting groove 111, the positioning rack 19 and the upper side tooth piece 531 of the lifting block 53 are matched, which can limit the linear movement of the moving rod 21 in the horizontal direction, the two pressing rods 13 are distributed in parallel, and the two pressing rods 13 press on the outer wall of the upper side of the shell 51, the pressing rod 13 and the shell 51 are slidably connected, the bottom of the main frame body 1 is provided with a height-adjustable foot cup 15 and a connecting frame 18, an opening on the connecting frame 18 is slidably connected with a clamping block 181, and the clamping block 181 is clamped with the bayonet 233 at the bottom of the counterweight frame 231, the bottom of the counterweight frame 231 and the connecting frame 18 are slidably connected through the clamping block 181, which ensures the stable linear movement of the moving rod 21, the upper side of the main frame body 1 is also provided with a mounting port 14, the damping simulation assembly 4 is arranged on the mounting port 14, the damping simulation assembly 4 comprises a bent support 41, a lead screw 42 and a nut seat 43 on the lead screw 42 are rotatably connected to the bent support 41, an L-shaped frame 44 is arranged on the outer wall of one side of the nut seat 43, a pressure rod 45 is arranged on the L-shaped frame 44, the pressure rod 45 passes through the mounting port 14, a damping block 46 is arranged at the lower end of the pressure rod 45, and the damping block 46 is located directly above the connecting shaft 16.

[0029] A motor 47 is mounted on the top of the bent support 41 through bolts, the output end of the motor 47 is connected with the upper end of the lead screw 42, and the cooperation between the motor 47, the damping block 46, the lead screw 42 and the nut seat 43 realizes the application of damping to the connecting shaft 16, simulates the aging of the lubricating grease between the hinge pin of the actuator cylinder and the bushing, and causes the friction coefficient to rise.

[0030] In the third embodiment, please refer to the accompanying Figure 3 and 5As shown, the connecting piece 22 and the moving rod 21 are connected through bolts; and / or, the connecting piece 22 and the moving rod 21 are in sliding connection, two groups of connection modes meet different simulation test requirements, the limiting assembly 5 comprises a detachable shell 51, the shell 51 is internally provided with a limiting frame 52, the limiting frame 52 is provided with a lifting block 53, and the recess on the lifting block 53 and the convex block on the limiting frame 52 are in sliding connection, the lifting block 53 is provided with tooth pieces 531 on the upper and lower sides, the shell 51 is provided with a rotating shaft 54 and a positioning gear 55 on the rotating shaft 54 on the lower side of the outer wall, the positioning gear 55 is matched with the tooth piece 531 on the lower side of the lifting block 53, the rotating shaft 54 can be limited to rotate, the rotating shaft 54 is further provided with a U-shaped frame 56, and the U-shaped frame 56 is connected with the upper end of the moving rod 21, the limiting assembly 5 further comprises an electric push rod 57, the output end of the electric push rod 57 is connected with one side of the lifting block 53, through the limiting assembly 5, the connection mode of the upper end of the moving rod 21 and the main frame body 1 is switched, in the static test, the upper end of the moving rod 21 is linearly moved, and in the dynamic test, the upper end of the moving rod 21 is rotationally connected.

[0031] The application is described above by way of example with reference to the drawings, and it is obvious that the specific implementation of the application is not limited by the above mode, as long as the method concept and technical scheme of the application are adopted for such non-essential improvement, or the concept and technical scheme of the application are directly applied to other occasions without improvement, which are all within the protection scope of the application.

Claims

1. A wear test device for actuator cylinder reciprocating dynamic seal, comprising a main frame (1), and a test mechanism (2) movably connected on the main frame (1), a connecting shaft (16) is rotatably connected in a mounting hole on one side of the main frame (1), and a mounting plate (17) is arranged on the connecting shaft (16), a detachable and replaceable to-be-tested actuator cylinder structure (3) is arranged on the lower side of the mounting plate (17), the to-be-tested actuator cylinder structure (3) comprises a cylinder barrel (31), a piston rod (33), a piston body (32) and a dynamic seal ring (34) on the piston body (32), characterized in that The testing mechanism (2) comprises a moving rod (21), the upper end of the moving rod (21) is provided with a limiting component (5) for controlling the rotation or translation of the moving rod (21), the lower end of the moving rod (21) is provided with a weight-adjustable counterweight component (23), the moving rod (21) is provided with a connecting piece (22), and the connecting piece (22) is hinged to one end of a piston rod (33).

2. A wear testing apparatus for reciprocating dynamic seals of actuator cylinders as defined in claim 1, characterized in that The connecting piece (22) and the moving rod (21) are connected through bolts; And / or, the connecting piece (22) and the moving rod (21) are in sliding connection.

3. A wear testing apparatus for reciprocating dynamic seals of actuator cylinders as defined in claim 1, characterized in that The limiting component (5) comprises a detachable shell (51), the shell (51) is provided with a limiting frame (52) therein, the limiting frame (52) is provided with a lifting block (53) thereon, and the recess on the lifting block (53) and the protrusion on the limiting frame (52) are in sliding connection; the lifting block (53) is provided with tooth pieces (531) on the upper and lower sides thereof; the outer wall of the shell (51) is provided with a rotating shaft (54) and a positioning gear (55) on the rotating shaft (54) on the lower side thereof; the positioning gear (55) is matched with the tooth piece (531) on the lower side of the lifting block (53), so that the rotation of the rotating shaft (54) can be limited.

4. A wear testing apparatus for reciprocating dynamic seals actuated by cylinders according to claim 3, characterized in that The rotating shaft (54) is further provided with a U-shaped frame (56), and the U-shaped frame (56) is connected with the upper end of the moving rod (21).

5. A wear testing apparatus for reciprocating dynamic seals actuated by cylinders as defined in claim 3, characterized in that The limiting component (5) further comprises an electric push rod (57), and the output end of the electric push rod (57) is connected with one side of the lifting block (53).

6. A wear testing apparatus for reciprocating dynamic seals of actuator cylinders as defined in claim 1, characterized in that The counterweight component (23) comprises a counterweight frame (231), a plurality of counterweight blocks (232) are arranged in the counterweight frame (231), the number of the counterweight blocks (232) can be increased or decreased, and the outer wall of the counterweight frame (231) is provided with a bayonet (233) at the bottom.

7. A wear testing apparatus for reciprocating dynamic seals of actuator cylinders as defined in claim 1, characterized in that The upper side of the main frame body (1) is provided with a top frame (11), a supporting frame (12) and two pressing rods (13), the top frame (11) and the supporting frame (12) are detachably connected, the inner wall of the supporting frame (12) is provided with a mounting groove (111), the mounting groove (111) is provided with a positioning rack (19), and the positioning rack (19) is matched with the tooth piece (531) on the upper side of the lifting block (53), so that the horizontal linear movement of the moving rod (21) can be limited; the two pressing rods (13) are arranged in parallel, and the two pressing rods (13) press on the outer wall of the shell (51) on the upper side.

8. A wear testing apparatus for reciprocating dynamic seals actuated by cylinders according to claim 7, characterized in that The bottom of the main frame body (1) is provided with a height-adjustable foot cup (15) and a connecting frame (18), the opening on the connecting frame (18) is slidably connected with a clamping block (181), and the clamping block (181) is clamped with the bayonet (233) at the bottom of the counterweight frame (231).

9. A wear testing apparatus for reciprocating dynamic seals actuated by cylinders according to claim 8, characterized in that The upper side of the main frame body (1) is further provided with a mounting port (14), a damping simulation assembly (4) is arranged on the mounting port (14), the damping simulation assembly (4) comprises a bending support (41), a lead screw (42) and a nut seat (43) on the lead screw (42) are rotatably connected to the bending support (41), an L-shaped frame (44) is arranged on one side of the outer wall of the nut seat (43), a pressure rod (45) is arranged on the L-shaped frame (44), the pressure rod (45) penetrates through the mounting port (14), a damping block (46) is arranged on the lower end of the pressure rod (45), and the damping block (46) is located directly above the connecting shaft (16).

10. A wear testing apparatus for reciprocating dynamic seals actuated by a cylinder according to claim 9, characterized in that A motor (47) is bolted to the top of the bending support (41), and the output end of the motor (47) is connected with the upper end of the lead screw (42).

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