A high-voltage plug life testing device simulating off-center load conditions

Abstract

This invention discloses a high-voltage plug life testing device simulating off-center load conditions, relating to the field of plug testing technology. It includes a frame, a lifting platform, and a plug interface mounted on the top of the frame. It also includes: a lifting assembly mounted on the frame for driving the lifting platform to move up and down along a vertical axis; and an off-center load simulation assembly mounted on the lifting platform for setting and maintaining the off-center load condition of the plug. The off-center load simulation assembly includes: an offset simulation unit for setting the initial off-center load orientation of the plug in the circumferential space. This invention constructs a spatial off-center load posture simulating non-ideal insertion by human intervention through the offset simulation unit and the skew simulation unit. During the forced correction process, it forces a unilateral compression interference between the plug and the internal terminals of the plug interface, objectively reproducing the lateral destructive force induced by posture deviation during actual assembly, making the determination of the actual end-of-life of the plug more objective.

Description

Technical Field

[0001] This invention relates to the field of plug-in testing technology, and more specifically to a high-voltage plug-in life testing device that simulates off-center load conditions. Background Technology

[0002] As a core electrical connection component in fields such as new energy vehicles and special equipment, the mechanical and electrical reliability of high-voltage plugs during the plugging process directly determines the safety of the system. In order to obtain the fatigue decay law of its contact terminals, it is usually necessary to use dedicated life testing equipment to repeatedly verify the plugging and unplugging cycle.

[0003] Existing plug-in head life testing equipment typically processes the following steps: the socket is fixed at the stationary end, and the plug-in head is rigidly fixed at the single-axis moving end, so that the central axes of the two are in an ideal state of absolute concentricity; then, the plug-in head is driven by a servo motor to perform plug-in and plug-out cycles along a single vertical axis, and the plug-in and plug-out force data and contact pressure drop along this axis are recorded in real time.

[0004] However, existing technologies have objective shortcomings: in actual engineering assembly, manual operation cannot guarantee that the plug and socket are always in an absolutely ideal positive alignment. Due to limitations in operating space or human error, the plug inevitably has random circumferential orientation deviation and spatial tilt angle during the initial insertion stage. When a plug with this initial orientation deviation is forcibly pushed into the interface, the geometry of the interface forces the plug to align with the central axis. During this forced alignment process, the internal metal terminals of the plug will be subjected to unilateral mechanical compression interference. Existing purely axial concentric testing equipment cannot objectively reproduce this kind of unilateral off-center load destructive force induced by human non-ideal alignment, resulting in fatigue life data obtained from the test being greater than the actual failure cycle in the actual application environment, and thus failing to objectively reflect the service life of the plug. Summary of the Invention

[0005] The purpose of this invention is to provide a high-voltage plug life testing device that simulates off-center load conditions, thereby solving the technical problem that existing pure axial life testing devices cannot simulate the unilateral off-center load interference caused by spatial orientation deviations in actual manual operation, resulting in fatigue decay data obtained from the test deviating from the actual working conditions.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a high-voltage plug life testing device simulating off-center load conditions, comprising a frame, a lifting platform, and a plug interface disposed on the top of the frame; further comprising: a lifting assembly disposed on the frame for driving the lifting platform to move up and down along a vertical axis; an off-center load simulation assembly disposed on the lifting platform for setting and maintaining the off-center load condition of the plug, the off-center load simulation assembly comprising: an off-center simulation unit for setting the initial off-center load orientation of the plug in the circumferential space; and a skew simulation unit disposed above the off-center simulation unit, comprising an arc-shaped guide rail and a component slidingly fitted on the arc-shaped guide rail. The slide is mounted on the slide; the geometric center of the arc-shaped guide rail coincides with the rigid contact origin of the interface; a clamping assembly, mounted on the slide, is used to fix the plug-in head to be tested; a monitoring and evaluation assembly, used to acquire failure boundary data and determine test termination, includes: a plug-in force detection unit, coupled with the lifting assembly, used to acquire torque data of the lifting assembly during vertical movement, and indirectly obtain axial plug-in force accordingly; an electrical performance detection unit, electrically connected to the plug-in head and interface to form a circuit, used to collect contact voltage drop in the plugging state online, and output a test termination command when the contact voltage drop exceeds a set threshold.

[0007] By adopting the above technical solution, by setting the bias simulation unit and the skew simulation unit, it is possible to construct the spatial off-center posture that simulates the non-ideal insertion by human. The bias simulation unit sets the circumferential orientation of the insertion interference, and the skew simulation unit sets the initial tilt angle during insertion. Since the geometric center of the arc guide rail is limited to coincide with the rigid contact origin of the insertion interface, it is ensured that when the insertion head is tilted at the set angle, its contact end face only undergoes angular deflection and does not translate, thereby ensuring accurate aiming at the insertion interface.

[0008] Furthermore, when the lifting platform drives the plug-in head, which is in an off-center load position, to push into the interface, the off-center load simulation component maintains the off-center trend of the plug-in head, forcing a unilateral compression interference between the plug-in head and the internal terminals of the interface. Combined with the axial insertion and extraction force and contact pressure drop data collected online by the monitoring and evaluation component, the fatigue evolution process of the plug-in head under unilateral force can be objectively reproduced and recorded, making the equipment's determination of the actual end of the plug-in head's service life more objective.

[0009] A further improvement of the technical solution of the present invention is that: the bias simulation unit includes a rotary drive component fixedly installed on the lifting platform, and a rotary table that is connected to the output end of the rotary drive component; the bias simulation unit is disposed on the top of the rotary table and rotates synchronously therewith; the rotary drive component is configured with a fixed bias load mode and a random bias load mode: in the fixed bias load mode, the rotary drive component drives the rotary table to rotate to a preset azimuth angle and maintains self-locking; in the random bias load mode, the rotary drive component is configured to drive the rotary table to rotate randomly by a set angle after each insertion and removal stroke; the circumferential reciprocating rotation range of the rotary table is limited to within ±180° of the initial position.

[0010] By adopting the above technical solution and configuring dual working modes, the multi-dimensional life assessment requirements are met. The fixed off-center load mode enables the equipment to continuously and quantitatively verify the off-center load on a specific circumferential section of the plug head (such as a known design weakness). The random off-center load mode generates disordered azimuth variables through system algorithms, which reproduces the random non-ideal alignment conditions caused by different operators and different blind insertion angles in actual assembly. This ensures that all circumferential surfaces of the metal terminals inside the plug head participate in fatigue evolution, and the overall life assessment data obtained is better than the test results of a single dimension.

[0011] Furthermore, by limiting the circumferential rotation range of the rotary table to within ±180°, this stroke not only covers the entire 360° test circumference in spatial geometry, but also allows the test leads used to connect the plug and the electrical performance testing unit to be flexibly suspended, eliminating the need to introduce conductive slip rings with sliding contact noise. This eliminates milliohm-level dynamic fluctuation noise in the contact resistance test circuit, ensuring the signal-to-noise ratio of electrical performance testing and the accuracy of failure determination.

[0012] A further improvement of the technical solution of the present invention is that: the skew simulation unit further includes an adjustment groove opened on the top of the rotary table, an adjustment screw is rotatably connected inside the adjustment groove, an adjustment slider is threadedly connected to the adjustment screw, and a mounting plate is fixedly connected to the top of the adjustment slider; an adjustment motor is fixedly installed on one side of the rotary table, the output end of the adjustment motor extends into the interior of the adjustment groove and is fixedly connected to the adjustment screw; two side plates are symmetrically fixedly connected to the top of the mounting plate, and guide rods are slidably passed through the two side plates, one end of the guide rod is fixedly connected to a limit head, and the other end is fixedly connected to a push plate, and a spring is sleeved on the outside of the guide rod and between the push plate and the side plate; a push block is installed at the bottom of the slide, and the push plate abuts against the push block to compress the spring when the slide slides along the arc-shaped guide rail under force.

[0013] By adopting the above technical solution, a composite transmission structure combining threaded drive and elastic guidance is introduced to achieve active quantitative preset of the initial deflection angle and passive flexible loading during the correction process. The solution transforms the traditional rigid transmission into an elastic impedance transmission. When the insertion head is forced to correct due to interference, the push block on the carriage presses the push plate in the opposite direction, and the spring is passively compressed to absorb the retraction displacement. This mechanism avoids damage to equipment components or brittle fracture of the insertion head housing due to absolute rigid constraints. At the same time, the linear deformation of the spring applies a continuous passive lateral resistance to the carriage that increases with the retraction distance, more realistically reproducing the physical interference environment of "the greater the deflection, the greater the resistance" in actual assembly conditions.

[0014] Furthermore, in the skew simulation unit, since the carriage moves along the curved guide rail and the push plate is constrained by the guide rod to make a horizontal linear yielding motion, the two will inevitably produce a normal relative displacement at the contact point. The existing rigid contact method will generate sliding friction under this working condition, which is prone to mechanical jamming under heavy load skew interference, resulting in an uneven output of the skew resistance, and thus interfering with the objectivity of the contact pressure drop data.

[0015] A further improvement of the technical solution of the present invention is that: the pushed block is cylindrical, and its two ends are connected to the slide via mounting seats, and the pushed block is rotatably connected to the mounting seats.

[0016] By adopting the above technical solution, the sliding friction pair caused by the non-coincidence of the arc motion and linear motion trajectory is eliminated by setting the push block as a self-rotating cylindrical structure. When the carriage is subjected to force and slides along the arc guide rail, the push block rolls purely on the contact surface of the push plate, converting sliding friction into rolling friction. This avoids mechanical jamming and ensures that the carriage has a high degree of smoothness in the forced alignment process. It also allows the elastic resistance output by the spring to be accurately applied to the side wall of the insertion head, eliminating the interference of mechanical friction on fatigue life assessment data.

[0017] Furthermore, since this solution is based on the off-center load test of tilted insertion, the plug head will passively yield when subjected to the normal directional force of the plug interface. If interference and jamming occur inside the plug head during the insertion process, the large downward pressure load continuously applied by the lifting platform will be converted into a bending moment that forces the plug head to continue to deflect in the yielding direction. If there is no stroke limit, the plug head is prone to uncontrolled reverse excessive bending, or even brittle fracture under instantaneous large torque, which will cause the plug interface fixed on the frame to be forcibly torn and damaged, causing the test equipment to malfunction.

[0018] A further improvement of the technical solution of the present invention is that: a threaded hole is provided in the middle of the side plate, and a mounting post is connected to the inside of the threaded hole through a threaded fit. A positioning ring is fixedly connected to the outside of the mounting post, and a mounting ring is threadedly connected to the outer wall of the mounting post. Several side rods are fixedly connected to the mounting ring, and a limiting ring is fixedly connected between the ends of the side rods away from the mounting ring. The limiting ring is located on the retraction path of the push plate and is used to limit the maximum stroke of the push plate moving toward the side plate.

[0019] By adopting the above technical solution, a rigid defense against reverse breakage is introduced for the skew simulation unit by constructing a threaded limit ring assembly behind the side plate. The limit ring, as a mechanical hard boundary, cuts off the path of the push plate sliding backward uncontrollably due to abnormal jamming, and limits the maximum allowable skew angle of the plug head in the retraction direction (i.e., the direction of deviation from the guide axis). This effectively prevents the plug head from bending backward under abnormal force, forcing it to passively withstand the forced guide compression of the plug interface or fail along the main axis, thus avoiding structural damage to the plug interface caused by unexpected reverse breakage.

[0020] In the skew simulation unit, relying solely on the spring to provide passive yielding resistance, the faster the insertion speed, the greater the instantaneous impact load and dynamic viscous friction generated by physical interference. Furthermore, during the withdrawal stroke, if only the spring acts, the released elastic potential energy will cause the carriage to experience high-frequency rebound oscillations, interfering with the mechanical stability of continuous cyclic testing.

[0021] A further improvement of the technical solution of the present invention is that: the mounting column is configured as a cylindrical structure, and the side of the mounting column with the opening faces the push plate; a piston plate is slidably connected inside the mounting column, and a linkage rod is fixedly connected to one side of the piston plate, and the end of the linkage rod away from the piston plate is fixedly connected to the push plate; a flow limiting tube is provided on the side of the mounting column away from the opening, and a flow regulating valve is provided on the flow limiting tube.

[0022] By employing the above technical solution, the mounting column is reused as a pneumatic cylinder and linked with the push plate. A viscous damping model is introduced in parallel based on elastic impedance. When the insertion / removal head is subjected to rapid interference compression, the piston plate compresses gas inside the cylindrical mounting column. The gas is discharged through the flow limiting tube, generating a pneumatic damping force. The magnitude of this damping force is positively correlated with the retraction speed of the slide, which can effectively absorb high-frequency dynamic impact loads, making the simulated interference force output by the equipment smoother. At the same time, the damping coefficient can be quantitatively set by adjusting the opening of the flow regulating valve. During the pull-out and reset phase, this pneumatic damping can suppress the mechanical oscillation generated by the release of potential energy from the spring, improving the stability of the test equipment operation.

[0023] Furthermore, in actual testing, there are significant differences in the axial length and contact origin position of different models of high-voltage plugs. If a fixed clamping height is used, plugs of different lengths will deviate from the theoretical center of the arc-shaped guide rail, causing the set skew action to be transformed into an unexpected lateral translation, thereby compromising the accuracy of the mechanical test model.

[0024] A further improvement of the technical solution of the present invention is as follows: the carriage includes a base plate fixedly connected to the mounting base and an inclination slider slidably connected to the arc-shaped guide rail. The inclination slider is fixedly connected to the base plate. An adjustment seat is fixedly connected to the top of the base plate. A lifting screw is rotatably connected inside the adjustment seat. A scissor drive slider is threadedly connected to the outside of the lifting screw. A support platform is connected to the top of the base plate through a scissor structure. A slide rail is fixedly connected to the bottom of the support platform. A follower block is slidably connected to the outside of the slide rail. The scissor structure includes a first link and a second link hinged in an X-shape at their middle. The bottom end of the first link is hinged to the base plate, and the top end is hinged to the follower block. The bottom end of the second link is hinged to the scissor drive slider, and the top end is hinged to the bottom of the support platform. When the lifting screw drives the scissor drive slider to move horizontally, the height of the support platform is changed by opening and closing the first link and the second link.

[0025] By adopting the above technical solution, an independent compensation for clamping height is provided by integrating a threaded scissor-type lifting mechanism into the carriage. Through the kinematic conversion between the lifting screw and the scissor linkage, the vertical height of the bearing platform can be precisely adjusted, so that the top contact surfaces of insertion and extraction heads of different lengths can be accurately aligned with the horizontal plane where the geometric center of the arc-shaped guide rail is located. At the same time, the scissor structure combined with the horizontal threaded drive can withstand the Z-direction vertical destructive load generated during spindle insertion and extraction without height collapse, ensuring the absolute stability of the off-center load geometric model during the test.

[0026] Furthermore, when clamping plugs with different outer diameters, their central axis will shift in one direction; this shift will disrupt the concentricity geometric constraint with the arc-shaped guide rail, causing the device to produce unexpected translational errors when setting the skew angle.

[0027] A further improvement of the technical solution of the present invention is that: the clamping assembly includes a clamp seat fixedly connected to the top of the support platform, a bidirectional screw is rotatably connected inside the clamp seat, and two clamping sliders are symmetrically threaded to the outside of the bidirectional screw. Both clamping sliders are slidably connected to the inner wall of the clamp seat, and a chuck is fixedly connected to the outer wall of each of the two clamping sliders. A V-groove is provided on the side of the two chucks that are close to each other; a placement groove is provided on the top of the support platform, and the two corners of the placement groove opening are rounded.

[0028] By employing the above technical solution, and by setting bidirectional screws with opposite rotation directions and symmetrical clamping sliders, regardless of how the outer diameter of the plug-in head to be tested changes, its central axis after clamping is always fixed on the physical midpoint of the fixture seat, ensuring a strict perpendicular alignment with the geometric center of the arc-shaped guide rail, thus eliminating the interference of clamping variables on the off-center load geometric model. The V-groove design on the inner side of the chuck increases the contact wrap angle with the cylindrical shell of the plug-in head, preventing stress concentration from causing the shell to crack. The rounded corner design at the groove opening provides a smooth physical transition boundary for the plug-in head when subjected to extreme skew correction, avoiding non-test-purpose cutting fracture damage caused by the tail of the plug-in head abutting a sharp edge.

[0029] A further improvement of the technical solution of the present invention is that: the lifting assembly includes a lead screw vertically mounted on the frame, a drive motor for driving the lead screw to rotate, and a lifting slider threadedly connected to the lead screw and sliding in the vertical direction; the lifting platform is fixedly connected to the lifting slider; four guide columns penetrating the lifting platform are provided on the frame; and the lifting platform is slidably connected to the guide columns; the insertion and extraction force detection unit includes a torque detection module provided at the output end of the drive motor or on the lead screw, used to monitor the driving torque when the lead screw rotates in real time; and the monitoring and evaluation component identifies the axial insertion and extraction force based on the mapping relationship between the driving torque and the axial load.

[0030] By adopting the above technical solution, the acquisition path of insertion and extraction force is transferred to the dynamic source of the lifting component, thus realizing the indirect measurement and parameter identification of insertion and extraction force. The torque detection module is configured at the drive motor or lead screw. The lateral extrusion force caused by off-center load interference is converted into additional frictional resistance between the lifting slider and the guide rail. This resistance is superimposed with the pure axial insertion and extraction force, causing the lead screw driving torque to increase synchronously. The monitoring and evaluation component identifies the data based on the driving torque containing frictional state variables. Compared with directly measuring the insertion and extraction force, it has higher sensitivity to capture micro-mechanical interference anomalies (such as terminal seizing or frictional force abrupt changes caused by plastic deformation), thus improving the monitoring effect of insertion and extraction force.

[0031] By adopting the above technical solution, the technical effects achieved by this invention compared to the prior art are as follows:

[0032] 1. This invention provides a high-voltage plug life testing device that simulates off-center load conditions. By constructing an off-center load posture that simulates human non-ideal insertion through an off-center simulation unit and an skew simulation unit, the device forces a unilateral compression interference between the plug and the internal terminals of the interface during the forced correction process. This objectively reproduces the lateral destructive force induced by posture deviation in actual assembly, making the device's determination of the actual end of the plug life more objective.

[0033] 2. This invention provides a high-voltage plug life testing device that simulates off-center load conditions. The skew simulation unit integrates a composite mechanism of spring relief, pneumatic damping, and rigid limiting. The pneumatic damping absorbs the high-frequency dynamic impact load generated by insertion interference. The rigid limiting ring cuts off the path of the plug that will uncontrollably retract due to abnormal jamming, preventing the plug from breaking unexpectedly in the opposite direction and forcing it to bear only the normal positive force of the plug interface, thus avoiding the tearing damage to the test device body.

[0034] 3. This invention provides a high-voltage plug life testing device that simulates off-center load conditions. The clamping assembly adopts a bidirectional screw clamping structure with a V-groove, which realizes automatic centering of plugs with different outer diameters using the normal component force. With the height compensation provided by the scissor lift structure, it ensures that the center point of the plug always strictly coincides with the geometric center of the arc guide rail, eliminating the lateral translation interference error that accompanies the setting of the skew angle of different plug models.

[0035] 4. This invention provides a high-voltage plug life testing device that simulates off-center load conditions. It can compensate and adjust the clamping height for high-voltage plugs of different lengths and specifications. It can precisely adjust and ensure that the contact origin of the plug is always strictly spatially aligned with the geometric center of the off-center load rotation. This eliminates the lateral translation interference error caused by height deviation when setting the skew angle for different plug models, and ensures the absolute accuracy of the geometric mechanical model in the off-center load test. Attached Figure Description

[0036] The invention will now be further described with reference to the accompanying drawings.

[0037] Figure 1 This is a three-dimensional structural diagram of the entire invention from a first-view perspective;

[0038] Figure 2 This is a three-dimensional structural diagram of the entire invention from a second perspective;

[0039] Figure 3 This is one of the structural schematic diagrams of the skew simulation unit and clamping assembly of the present invention;

[0040] Figure 4 This is the second schematic diagram of the structure of the skew simulation unit and clamping assembly of the present invention;

[0041] Figure 5 This is a partial structural schematic diagram of the skew simulation unit of the present invention;

[0042] Figure 6 This is a schematic diagram of the disassembled structure of the mounting column and side plate of the present invention;

[0043] Figure 7 This is a schematic diagram of the structure of the carriage of the present invention.

[0044] In the diagram: 1. Frame; 2. Lifting assembly; 201. Drive motor; 202. Lead screw; 203. Lifting slider; 204. Lifting platform; 205. Guide column; 301. Rotary drive component; 302. Rotary platform; 4. Skew simulation unit; 401. Adjusting motor; 402. Adjusting groove; 403. Adjusting screw; 404. Adjusting slider; 405. Mounting plate; 406. Side plate; 407. Guide rod; 408. Limit head; 409. Push plate; 410. Spring; 411. Arc-shaped guide rail; 412. Push block; 413. Mounting base; 501. Mounting column; 502. Positioning ring; 503. Mounting ring; 50 4. Side rod; 505. Limiting ring; 601. Piston plate; 602. Linkage rod; 603. Flow limiting tube; 604. Flow regulating valve; 7. Clamping assembly; 701. Fixture seat; 702. Bidirectional screw; 703. Clamping slider; 704. Chuck; 705. V-groove; 706. Bearing platform; 707. Rounded corner; 708. Placement slot; 8. Slide carriage; 801. Base plate; 802. Adjustment seat; 803. Lifting screw; 804. Scissor drive slider; 805. Slide rail; 806. Follower block; 807. Tilt slider; 81. Scissor structure; 811. First connecting rod; 812. Second connecting rod; 9. Insertion interface. Detailed Implementation

[0045] The present invention will be further described in detail below with reference to the embodiments.

[0046] Example 1

[0047] like Figures 1-7 As shown, this invention provides a high-voltage plug life testing device for simulating off-center load conditions, including a frame 1, a lifting platform 204, and a plug interface 9 disposed on the top of the frame 1; it also includes: a lifting assembly 2, disposed on the frame 1, for driving the lifting platform 204 to move up and down along the vertical axis; an off-center load simulation assembly, disposed on the lifting platform 204, for setting and maintaining the off-center load condition of the plug, the off-center load simulation assembly including: an off-center simulation unit, for setting the initial off-center load orientation of the plug in the circumferential space; and a skew simulation unit 4, disposed above the off-center simulation unit, including an arc-shaped guide rail 411 and a component slidingly fitted on the arc-shaped guide rail 411. The slide 8 has a geometric center that coincides with the rigid contact origin of the insertion interface 9. A clamping assembly 7, mounted on the slide 8, is used to fix the insertion head to be tested. A monitoring and evaluation assembly, used to acquire failure boundary data and determine test termination, includes: an insertion / extraction force detection unit coupled to the lifting assembly 2, used to acquire torque data of the lifting assembly 2 during vertical movement, and indirectly obtain axial insertion / extraction force accordingly; and an electrical performance detection unit electrically connected to the insertion head and the insertion interface 9 to form a circuit, used to collect contact voltage drop under the insertion state online, and output a test termination command when the contact voltage drop exceeds a set threshold.

[0048] In this embodiment, by setting the bias simulation unit and the skew simulation unit 4, the spatial off-center posture of simulating a non-ideal human insertion can be constructed. The bias simulation unit sets the circumferential orientation of the insertion interference, and the skew simulation unit 4 sets the initial tilt angle during insertion. Since the geometric center of the arc guide rail 411 is limited to coincide with the rigid contact origin of the insertion interface 9, it is ensured that when the insertion head is tilted at the set angle, its contact end face only undergoes angular deflection and does not translate, thereby ensuring that it can accurately aim at the insertion interface 9.

[0049] Furthermore, when the lifting platform 204 drives the plug-in head, which is in an off-center load position, to push into the plug-in interface 9, the off-center load simulation component maintains the off-center trend of the plug-in head, forcing a unilateral extrusion interference between the plug-in head and the internal terminals of the plug-in interface 9. Combined with the axial insertion and extraction force and contact pressure drop data collected online by the monitoring and evaluation component, the fatigue evolution process of the plug-in head under unilateral force can be objectively reproduced and recorded, making the equipment's determination of the actual end of the plug-in head's service life more objective.

[0050] The specific work process is as follows:

[0051] During the off-center load setting phase, the plug-in head to be tested is installed in the clamping assembly 7 on the slide 8. The control system drives the slide 8 to rotate in the circumferential direction to a preset azimuth angle through the bias simulation unit. Further, the slide 8 is driven to move along the arc guide rail 411 of the bias simulation unit 4 to a set bias angle. The above spatial pose setting is used to reproduce the initial plug-in pose deviation caused by incomplete orthogonal alignment in actual manual assembly.

[0052] During the off-center load insertion detection stage, the lifting platform 204 drives the off-center load simulation component and the plug-in head to move downward along the vertical axis. When the plug-in head with an initial tilt angle enters the plug interface 9 fixed at the top of the frame 1, the inner wall guide structure of the plug interface 9 generates a normal mechanical guiding effect on the plug-in head. Since the off-center load simulation component maintains the set tilt posture, a one-sided mechanical extrusion interference occurs between the metal terminal inside the plug-in head and the plug interface 9.

[0053] During the cyclic testing and boundary judgment phase, the lifting assembly 2 drives the off-center load simulation assembly to perform reciprocating insertion and extraction movements of the insertion / extraction head. The insertion / extraction force detection unit acquires the torque data of the drive motor 201 of the lifting assembly 2 in real time during the vertical movement process, and indirectly calculates the peak value of the axial insertion / extraction force in each insertion / extraction stroke by combining the transmission ratio of the lead screw 202 and the friction coefficient. At the same time, the electrical performance detection unit monitors the contact voltage drop in the plug-in closed state. When the electrical performance detection unit detects that the contact voltage drop is greater than the set failure threshold, or when the peak value of the axial insertion / extraction force identified by the insertion / extraction force detection unit shows a preset offset characteristic, it outputs a test termination command to the system, thereby quantitatively evaluating the fatigue life of the insertion / extraction head under non-ideal insertion conditions.

[0054] like Figure 2 and Figure 3 As shown, preferably, the bias simulation unit includes a rotary drive 301 fixedly mounted on the lifting platform 204, and a rotary table 302 that is connected to the output end of the rotary drive 301; the skew simulation unit 4 is disposed on the top of the rotary table 302 and rotates synchronously therewith; the rotary drive 301 is configured with a fixed bias load mode and a random bias load mode: in the fixed bias load mode, the rotary drive 301 drives the rotary table 302 to rotate to a preset azimuth angle and maintains self-locking; in the random bias load mode, the rotary drive 301 is configured to drive the rotary table 302 to rotate randomly by a set angle after each insertion and removal stroke; the circumferential reciprocating rotation range of the rotary table 302 is limited to within ±180° of the initial position.

[0055] In this embodiment, by configuring two working modes, the multi-dimensional life assessment requirements are met. The fixed off-center load mode enables the device to continuously and quantitatively verify the off-center load for a specific circumferential section of the plug head (such as a known design weakness). The random off-center load mode generates disordered azimuth variables through system algorithms, which reproduces the random non-ideal alignment conditions caused by different operators and different blind insertion angles in actual assembly, ensuring that all circumferential surfaces of the metal terminals inside the plug head participate in fatigue evolution. The overall life assessment data obtained is better than the test results of a single dimension.

[0056] Furthermore, the circumferential rotation range of the rotary table 302 is limited to within ±180°. This stroke not only covers the entire 360° test circumference in spatial geometry, but also allows the test leads used to connect the plug and the electrical performance testing unit to be flexibly suspended, eliminating the need to introduce conductive slip rings with sliding contact noise. This eliminates milliohm-level dynamic fluctuation noise in the contact resistance test circuit, ensuring the signal-to-noise ratio of electrical performance testing and the accuracy of failure determination.

[0057] When the equipment is operating in fixed off-center load mode: Before the test starts, the control system sends a specific azimuth angle command to the rotary drive 301 (e.g., positioning to 45°). After the rotary table 302 rotates to the position, the rotary drive 301 enters the enabled lock state and outputs holding torque. In the subsequent Z-axis cyclic insertion and extraction stroke, since the rotary table 302 maintains absolute self-locking, the mechanical reaction force generated by the insertion interface 9 forcibly guiding the insertion head always acts on the 45° section of the insertion head in the circumferential direction, which is used to obtain fatigue yield data for this specific phase.

[0058] When the equipment is running in random off-center load mode: This mode is used to simulate disordered blind insertion deviation in actual engineering. After a single insertion and withdrawal (i.e., completing a complete Z-axis stroke), the internal program of the control system generates a random angle variable and drives the rotary drive 301 to rotate the rotary table 302 to a new position. In this way, each insertion and withdrawal interference occurs on different surfaces of the outer periphery of the insertion head, causing its internal terminals to bear all-round alternating off-center load stress.

[0059] During the operation of the above two modes, the underlying control algorithm of the equipment and the mechanical limit block jointly execute the ±180° boundary constraint logic; the test wires led out from the tail of the plug-in head are directly connected to the electrical performance testing unit outside the frame 1 (forming a seamless pure copper test circuit). When the cumulative rotation angle of the rotary table 302 reaches the +180° or -180° boundary in the random off-center load mode, the control system forces the next random rotation direction to be set to reverse rotation. Through this limiting mechanism, not only is random testing of the full circumferential angle achieved, but also the test wires are ensured not to be entangled or broken.

[0060] The rotary drive 301 is preferably a servo motor or a closed-loop stepper motor with an absolute encoder, which is fixed on the lifting platform 204 and the output shaft is rigidly connected to the rotary platform 302.

[0061] like Figure 3 , Figure 4 and Figure 5 As shown, preferably, the skew simulation unit 4 further includes an adjustment groove 402 formed on the top of the rotary table 302. An adjustment screw 403 is rotatably connected inside the adjustment groove 402, and an adjustment slider 404 is threaded onto the adjustment screw 403. A mounting plate 405 is fixedly connected to the top of the adjustment slider 404. An adjustment motor 401 is fixedly mounted on one side of the rotary table 302, and the output end of the adjustment motor 401 extends into the adjustment groove 402 and is fixedly connected to the adjustment screw 403. The mounting plate 405... Two side plates 406 are symmetrically fixedly connected to the top. Guide rods 407 are slidably passed through both side plates 406. One end of the guide rod 407 is fixedly connected to a limit head 408, and the other end is fixedly connected to a push plate 409. A spring 410 is sleeved on the outside of the guide rod 407 and between the push plate 409 and the side plate 406. A push block 412 is installed at the bottom of the slide 8. The push plate 409 abuts against the push block 412 to compress the spring 410 when the slide 8 slides along the arc-shaped guide rail 411 under force.

[0062] In this embodiment, by introducing a composite transmission structure that combines threaded drive and elastic guidance, the active quantification and preset of the initial deflection angle and the passive flexible loading during the correction process are realized. The scheme transforms the traditional rigid transmission into an elastic impedance transmission. When the insertion head is forced to correct due to interference, the push block 412 on the slide 8 presses the push plate 409 in the opposite direction, and the spring 410 passively compresses and absorbs the retraction displacement. This mechanism avoids damage to equipment components or brittle fracture of the insertion head housing due to absolute rigid constraints. At the same time, the linear deformation of the spring 410 applies a continuous passive lateral resistance to the slide 8 that increases with the retraction distance, more realistically reproducing the physical interference environment of "the greater the deflection, the greater the resistance" in actual assembly conditions.

[0063] During operation, the control system drives the adjustment motor 401 to start, and its output rotational torque is converted into a horizontal thrust of the adjustment slider 404 along the adjustment groove 402 through the adjustment screw 403. The adjustment slider 404 drives the mounting plate 405, side plate 406 and push plate 409 to move forward as a whole. Since the spring 410 has initial stiffness, the push plate 409 pushes the push block 412 at the bottom of the slide 8, forcing the slide 8 to carry the plug-in head to be tested to slide along the arc guide rail 411 to the set initial deflection angle (after reaching the preset angle, by controlling the overshoot of the adjustment motor 401, the spring 410 can be in a pre-compression state, so that before the plug-in head causes physical interference, the initial torque threshold that the system allows to give way is preset to simulate the static preload caused by the weight of large-size cables or assembly stress in actual operation).

[0064] When the lifting platform 204 drives the plug-in head, which is in an oblique posture, to forcibly insert into the plug-in interface 9, the mechanical guide of the inner wall of the plug-in interface 9 forces the plug-in head to deflect toward the concentric axis. At this time, the slide 8 is subjected to a reverse guiding force, and the push block 412 at its bottom pushes the push plate 409 backward.

[0065] During this yielding process, the adjusting motor 401 and the adjusting slider 404 are in a rigid self-locking state (fixed position), while the push plate 409 slides backward under force, causing the guide rod 407 to slide against friction within the side plate 406, and the spring 410 located between the push plate 409 and the side plate 406 is further compressed. This elastic component converts the rigid spatial displacement deviation into a flexible elastic potential energy reserve, outputting a continuous passive off-center load resistance force to the metal terminal;

[0066] When the pull-out stroke is initiated, the off-center interference force is gradually released. The compressed spring 410 releases its elastic potential energy, pushing the push plate 409 and the slide 8 to reset along the arc-shaped guide rail 411 to the set initial tilt angle, in preparation for the next insertion cycle. The limiting head 408 at the end of the guide rod 407 limits the maximum sliding stroke of the guide rod 407 to prevent the elastic component from detaching under no-load conditions.

[0067] like Figure 1 and Figure 2 As shown, preferably, the lifting assembly 2 includes a lead screw 202 vertically mounted on the frame 1, a drive motor 201 driving the lead screw 202 to rotate, and a lifting slider 203 threadedly connected to the lead screw 202 and sliding in the vertical direction. The lifting platform 204 is fixedly connected to the lifting slider 203. Four guide posts 205 penetrating the lifting platform 204 are provided on the frame 1, and the lifting platform 204 is slidably connected to the guide posts 205. The insertion and extraction force detection unit includes a torque detection module mounted on the output end of the drive motor 201 or on the lead screw 202, used to monitor the driving torque when the lead screw 202 rotates in real time. The monitoring and evaluation component identifies the axial insertion and extraction force based on the mapping relationship between the driving torque and the axial load.

[0068] In this embodiment, by shifting the acquisition path of the insertion and extraction force to the dynamic source of the lifting component 2, indirect measurement and parameter identification of the insertion and extraction force are achieved. The torque detection module is configured at the drive motor 201 or the lead screw 202. The lateral extrusion force caused by the off-center load interference is converted into additional frictional resistance between the lifting slider 203 and the guide rail. This resistance is superimposed with the pure axial insertion and extraction force, causing the driving torque of the lead screw 202 to increase synchronously. The monitoring and evaluation component identifies the data based on the driving torque containing frictional state variables. Since a direct force sensor connected in series at the execution end is susceptible to physical damage from the lateral bending moment of the off-center load, the torque measurement scheme arranges the detection module at the drive source end, and the frame and lead screw mechanism rigidly absorb the lateral destructive force, avoiding structural damage to the mechanical sensor. Therefore, compared with direct measurement of the insertion and extraction force, it has higher detection sensitivity for micro-mechanical interference anomalies (such as terminal seizing or frictional force abrupt changes caused by plastic deformation), thus improving the monitoring effect of the insertion and extraction force.

[0069] Example 2

[0070] like Figure 3 , Figure 4 and Figure 7 As shown, based on Embodiment 1, the present invention provides a technical solution: preferably, the push block 412 is cylindrical, and both ends are connected to the slide 8 through the mounting base 413, and the push block 412 is rotatably connected to the mounting base 413.

[0071] In this embodiment, by setting the push block 412 as a self-rotating cylindrical structure, the sliding friction pair caused by the non-coincidence of the arc motion and the linear motion trajectory is eliminated. When the slide 8 is subjected to force and slides along the arc guide rail 411, the push block 412 rolls purely on the contact surface of the push plate 409, converting the sliding friction into rolling friction, avoiding mechanical jamming, ensuring that the slide 8 has a high degree of smoothness in the forced alignment process, so that the elastic resistance output by the spring 410 can be accurately applied to the side wall of the plug head, eliminating the interference of mechanical friction on the fatigue life assessment data.

[0072] During the off-center insertion and forced alignment stage, as the lifting platform 204 descends, the inner wall of the insertion interface 9 forces the insertion head and the slide 8 to deflect from the skewed state to the concentric state. During this process, the movement trajectory of the slide 8 is an arc along the arc guide rail 411, while the push plate 409 makes a horizontal straight-line retreat behind it to overcome the elastic force of the spring 410.

[0073] The difference in the motion trajectories of the two causes the contact point between the push block 412 and the push plate 409 to slide relative to each other in the vertical direction. At this time, the cylindrical push block 412, supported by the bearings of the mounting seats 413 at both ends, rotates under the action of frictional torque and rolls smoothly on the front end face of the push plate 409.

[0074] This rolling contact mechanism reduces the disordered frictional resistance that hinders the slide 8 from retracting, ensuring that when the plug is subjected to unilateral compression interference, the reverse resistance it feels mainly comes from the set compression resistance of the spring 410, rather than the jamming force of the mechanical transmission mechanism, thereby improving the fidelity of the equipment in simulating flexible off-center load conditions.

[0075] Example 3

[0076] like Figure 3 , Figure 5 and Figure 6 As shown, based on Embodiment 2, the present invention provides a technical solution: Preferably, a threaded hole is provided in the middle of the side plate 406, and a mounting post 501 is connected to the inside of the threaded hole by a threaded fit. A positioning ring 502 is fixedly connected to the outside of the mounting post 501, and a mounting ring 503 is threadedly connected to the outer wall of the mounting post 501. A plurality of side rods 504 are fixedly connected to the mounting ring 503, and a limiting ring 505 is fixedly connected between the ends of the side rods 504 away from the mounting ring 503. The limiting ring 505 is located on the retraction path of the push plate 409 and is used to limit the maximum stroke of the push plate 409 moving toward the side plate 406.

[0077] In this embodiment, by constructing a threaded limit ring 505 assembly behind the side plate 406, a rigid defense against reverse breakage is introduced for the skew simulation unit 4. The limit ring 505, as a mechanical hard boundary, cuts off the path of the push plate 409 sliding backward uncontrollably due to abnormal jamming, and limits the maximum allowable skew angle of the plug head in the retraction direction (i.e., the direction of deviation from the guide axis). This effectively prevents the plug head from bending backward when subjected to abnormal force, forcing it to passively withstand the forced guide compression of the plug interface 9 or fail along the main axis, thus avoiding structural damage to the plug interface 9 caused by unexpected reverse breakage.

[0078] Furthermore, by continuously adjusting the engagement position of the mounting ring 503, the safety offset limit can be precisely set according to the different stiffness of the plug-in head.

[0079] During the test preparation phase, the operator needs to set the safe retraction stroke of the equipment according to the housing material and maximum allowable deformation of the plug-in head to be tested. The operator screws on the mounting ring 503 fitted on the outside of the mounting post 501 and changes the initial gap between the limit ring 505 and the back of the push plate 409 by thread feed to complete the quantitative setting of the maximum deflection angle of the slide 8. The positioning ring 502 on the outside of the mounting post 501 is used to limit the maximum depth of the mounting post 501 screwed into the threaded hole of the side plate 406, as the reference zero position for adjustment.

[0080] During the off-center load test execution phase, the push plate 409 is pushed back by the slide 8, overcoming the elastic force of the spring 410 and retracting towards the side plate 406. At this time, the plug-in head bears the set elastic off-center load extrusion force.

[0081] When extreme interference and jamming occur during insertion, the downward thrust of the lifting platform 204 is converted into a destructive force that forces the plug head to bend excessively in the opposite direction. At this time, the slide 8 tends to over-yield, and the back of the push plate 409 slides backward and abuts against the limiting ring 505. The rigid block of the limiting ring 505 forcibly terminates the further yielding and sliding of the slide 8, completely locking the reverse tilting degree of freedom of the plug head. This forces the jammed plug head to be unable to break backward to release force, and it can only continue to bear the strong guiding force from the central axis direction of the plug interface 9. Thus, it will not cause lateral fracture damage that tears the plug interface 9, thereby ensuring the accuracy of the test data and improving the safety of the testing machine.

[0082] Example 4

[0083] like Figure 5 and Figure 6As shown, based on Embodiment 3, the present invention provides a technical solution: Preferably, the mounting post 501 is configured as a cylindrical structure, and the side of the mounting post 501 with an opening faces the push plate 409; a piston plate 601 is slidably connected inside the mounting post 501, and a linkage rod 602 is fixedly connected to one side of the piston plate 601, and the end of the linkage rod 602 away from the piston plate 601 is fixedly connected to the push plate 409; a flow limiting tube 603 is provided on the side of the mounting post 501 away from the opening, and a flow regulating valve 604 is provided on the flow limiting tube 603.

[0084] In this embodiment, by reusing the mounting post 501 as a pneumatic cylinder and linking it with the push plate 409, a viscous damping model is introduced in parallel based on elastic impedance. When the insertion / removal head is subjected to rapid interference compression, the piston plate 601 compresses gas inside the cylindrical mounting post 501. The gas is discharged through the flow limiting pipe 603, generating a pneumatic damping force. The magnitude of this damping force is positively correlated with the retraction speed of the slide 8, which can effectively absorb high-frequency dynamic impact loads, making the simulated interference force output by the device smoother. At the same time, by adjusting the opening of the flow regulating valve 604, the damping coefficient can be quantitatively set. During the pull-out and reset phase, this pneumatic damping can suppress the mechanical oscillation generated by the release of potential energy by the spring 410, improving the stability of the test equipment operation.

[0085] During the off-center insertion test, when the insertion head is interfered with by the insertion interface 9, forcing the slide 8 to move the push plate 409 backward, the push plate 409 overcomes the elastic force of the spring 410 and simultaneously pushes the linkage rod 602 to move into the mounting post 501. The linkage rod 602 drives the piston plate 601 to slide inside the cylindrical mounting post 501, which compresses the air in the sealed chamber behind the mounting post 501. The compressed air can only be discharged outward through the flow limiting pipe 603 away from the opening side. Since the flow regulating valve 604 throttles and limits the flow cross-sectional area, the airflow discharge is obstructed, thereby forming a pressure resistance (damping force) at the front end of the piston plate 601 that is proportional to the retraction speed. This damping force is superimposed with the elastic resistance of the spring 410 and acts together on the slide 8 to limit the high-frequency vibration of the slide 8.

[0086] Preferably, the operator can change the flow area by rotating the flow regulating valve 604: when a smaller opening is set, the system exhibits high damping characteristics, which is suitable for simulating tight interference conditions with small fit tolerances; when a larger opening is set, the damping decreases, and the elastic resistance is mainly played by the spring 410.

[0087] Example 5

[0088] like Figure 4 and Figure 7As shown, based on Embodiment 1, the present invention provides a technical solution: Preferably, the slide 8 includes a base plate 801 fixedly connected to the mounting base 413 and an angle slider 807 slidably connected to the arc-shaped guide rail 411. The angle slider 807 is fixedly connected to the base plate 801. An adjusting seat 802 is fixedly connected to the top of the base plate 801. A lifting screw 803 is rotatably connected inside the adjusting seat 802, and a scissor drive slider 804 is threadedly connected to the outside of the lifting screw 803. A support platform 706 is connected to the top of the base plate 801 through a scissor structure 81. The bottom of the support platform 706... The scissor lift structure 81 is fixedly connected to a slide rail 805, and a follower block 806 is slidably connected to the outside of the slide rail 805. The scissor lift structure 81 includes a first link 811 and a second link 812 that are hinged to each other in an X-shape at their middle. The bottom end of the first link 811 is hinged to the base plate 801, and the top end is hinged to the follower block 806. The bottom end of the second link 812 is hinged to the scissor lift drive slider 804, and the top end is hinged to the bottom of the support platform 706. When the lifting screw 803 drives the scissor lift drive slider 804 to move horizontally, the height of the support platform 706 is changed by opening and closing the first link 811 and the second link 812.

[0089] In this embodiment, by integrating a threaded scissor lift mechanism within the carriage 8, independent compensation for clamping height is provided. Through the kinematic conversion between the lifting screw 803 and the scissor link, the vertical height of the bearing platform 706 can be precisely adjusted, ensuring that the top contact surfaces of insertion / removal heads of different lengths can be accurately aligned with the horizontal plane where the geometric center of the arc-shaped guide rail 411 is located. At the same time, the scissor structure 81, combined with the horizontal threaded drive, can withstand the Z-direction vertical destructive load generated during spindle insertion / removal without height collapse, ensuring the absolute stability of the off-center load geometric model during testing.

[0090] During the test preparation phase, in order to ensure that the contact origin of the plug under test is strictly coincident with the rotation center of the arc guide rail 411, the height of the bearing platform 706 needs to be calibrated and compensated.

[0091] The operator rotates the lifting screw 803 inside the adjusting seat 802, and its rotational torque is converted into a linear thrust of the scissor drive slider 804 in the horizontal direction. Since the bottom hinge dead point of the first link 811 is on the base plate 801, when the scissor drive slider 804 pushes the bottom of the second link 812 to make a horizontal displacement, the opening and closing angle of the first link 811 and the second link 812 around the X-shaped hinge point at their geometric center changes.

[0092] As the angle between the two links decreases or increases, the bearing platform 706, which is supported by the top of the two links, rises and falls smoothly in the pure vertical direction. During this process, the follower block 806, which is hinged at the top of the first link 811, slides freely on the slide rail 805 at the bottom of the bearing platform 706, absorbing the horizontal displacement difference generated when the scissor mechanism deforms, and ensuring that the bearing platform 706 only undergoes Z-axis height compensation.

[0093] During the off-center insertion test execution phase: Since the horizontal component of the force at the bottom of the connecting rod is completely offset by the self-locking stiffness of the lifting screw 803, the scissor structure 81 has high axial compressive stiffness, and the bearing platform 706 will not experience microscopic vertical collapse. This design ensures that no matter how large the test insertion and extraction force is, the set off-center center reference will never drift, thus ensuring the objectivity and accuracy of the failure boundary data.

[0094] like Figure 3 and Figure 4 As shown, preferably, the clamping assembly 7 includes a clamp seat 701 fixedly connected to the top of the support platform 706. A bidirectional screw 702 is rotatably connected inside the clamp seat 701. Two clamping sliders 703 are symmetrically threaded to the outside of the bidirectional screw 702. Both clamping sliders 703 are slidably connected to the inner wall of the clamp seat 701. A chuck 704 is fixedly connected to the outer wall of each of the two clamping sliders 703. A V-groove 705 is provided on the side of each chuck 704 that is close to each other. A placement groove 708 is provided on the top of the support platform 706. The two corners of the opening of the placement groove 708 are rounded 707.

[0095] In this embodiment, by setting bidirectional screws 702 with opposite rotation directions and symmetrical clamping sliders 703, regardless of how the outer diameter of the plug-in head to be tested changes, its central axis after clamping is always fixed on the physical midpoint of the fixture seat 701, ensuring a strict perpendicular alignment with the geometric center of the arc-shaped guide rail 411, and eliminating the interference of clamping variables on the off-center load geometric model; the V-groove 705 design on the inner side of the chuck 704 increases the contact wrap angle with the cylindrical shell of the plug-in head, preventing stress concentration from causing the shell to crack; the rounded corner 707 design at the opening of the placement groove 708 provides a smooth physical transition boundary for the plug-in head when subjected to extreme skew correction, avoiding non-test-purpose cutting fracture damage caused by the tail of the plug-in head abutting a sharp edge.

[0096] During the clamping stage of test preparation, the operator places the tail of the plug-in head to be tested in the placement slot 708 on the top of the support platform 706. By rotating the bidirectional screw 702, since the two sides of the bidirectional screw 702 are machined with threads of opposite directions, the two clamping sliders 703 move towards each other at the same speed or move away from each other at the same speed under the guidance and constraint of the inner wall of the clamp seat 701. When moving towards each other at the same speed, the two chucks 704 move towards the center of the plug-in head with symmetrical displacement until the chucks 704 with V-grooves 705 simultaneously abut against and hold the plug-in head shell from both sides, forcing the central axis of the plug-in head to be precisely located on the preset reference plane. This reference plane is strictly coincident with the geometric center line of the arc-shaped guide rail 411 in space, thereby ensuring that when adjusting the tilt angle of the slide 8, the end face of the plug-in head can achieve pure angular deflection without lateral translation.

[0097] The present invention has been described in detail above. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, any modifications or improvements that do not depart from the spirit of the present invention are within the scope of protection of the present invention.

Claims

1. A high-voltage plug life testing device simulating off-center load conditions, comprising a frame (1), a lifting platform (204), and a plug interface (9) disposed on the top of the frame (1); characterized in that, Also includes: A lifting assembly (2) is mounted on the frame (1) and is used to drive the lifting platform (204) to move up and down along the vertical axis; An off-center load simulation component, disposed on the lifting platform (204), is used to set and maintain the off-center load condition of the plug-in head. The off-center load simulation component includes: The bias simulation unit is used to set the initial bias orientation of the plug-in head in the circumferential space, and includes a rotary table (302). The skew simulation unit (4) is set on the skew simulation unit and includes an arc-shaped guide rail (411) and a slide (8) that slides on the arc-shaped guide rail (411); the geometric center of the arc-shaped guide rail (411) coincides with the rigid contact origin of the insertion interface (9) in space; The clamping assembly (7) is mounted on the slide (8) and is used to fix the plug-in head to be tested; The monitoring and evaluation component, used to acquire failure boundary data and determine test termination, includes: The insertion and extraction force detection unit is coupled to the lifting assembly (2) and is used to obtain the torque data of the lifting assembly (2) during the vertical movement process, and indirectly obtain the axial insertion and extraction force accordingly. The electrical performance testing unit is electrically connected to the plug and the plug interface (9) and forms a circuit. It is used to collect the contact voltage drop in the plug-in state online and output a test termination command when the contact voltage drop is greater than a set threshold. The skew simulation unit (4) further includes an adjustment slot (402) opened on the top of the rotary table (302). An adjustment screw (403) is rotatably connected inside the adjustment slot (402). An adjustment slider (404) is threadedly connected to the adjustment screw (403). A mounting plate (405) is fixedly connected to the top of the adjustment slider (404). An adjustment motor (401) is fixedly installed on one side of the rotary table (302). The output end of the adjustment motor (401) extends into the interior of the adjustment slot (402) and is fixedly connected to the adjustment screw (403). The top of the mounting plate (405) is symmetrically fixedly connected to... Two side plates (406) are connected, and guide rods (407) are slidably passed through both side plates (406). One end of the guide rod (407) is fixedly connected to a limit head (408), and the other end is fixedly connected to a push plate (409). A spring (410) is sleeved on the outside of the guide rod (407) and between the push plate (409) and the side plate (406). A push block (412) is installed at the bottom of the slide (8). The push plate (409) abuts against the push block (412) to compress the spring (410) when the slide (8) is subjected to force and slides along the arc-shaped guide rail (411).

2. The high-voltage plug life testing device simulating off-center load conditions according to claim 1, characterized in that: The bias simulation unit also includes a rotary drive (301) fixedly mounted on the lifting platform (204), and the rotary platform (302) is connected to the output end of the rotary drive (301) via a transmission connection; the skew simulation unit (4) is disposed on the top of the rotary platform (302) and rotates synchronously therewith; the rotary drive (301) is configured with a fixed bias load mode and a random bias load mode: In the fixed off-center loading mode, the rotary drive (301) drives the rotary table (302) to rotate to a preset azimuth angle and maintains self-locking; In the random off-center loading mode, the rotary drive (301) is configured to drive the rotary table (302) to rotate randomly by a set angle after each insertion / removal stroke. The circumferential reciprocating rotation range of the rotary table (302) is limited to within ±180° of the initial position.

3. The high-voltage plug life testing device simulating off-center load conditions according to claim 2, characterized in that: The push block (412) is cylindrical and its two ends are connected to the slide (8) through mounting bases (413). The push block (412) is rotatably connected to the mounting bases (413).

4. The high-voltage plug life testing device simulating off-center load conditions according to claim 3, characterized in that: A threaded hole is provided in the middle of the side plate (406). A mounting post (501) is connected to the inside of the threaded hole by a threaded connection. A positioning ring (502) is fixedly connected to the outside of the mounting post (501). A mounting ring (503) is threadedly connected to the outer wall of the mounting post (501). Several side rods (504) are fixedly connected to the mounting ring (503). A limiting ring (505) is fixedly connected between the ends of the side rods (504) away from the mounting ring (503). The limiting ring (505) is located on the retraction path of the push plate (409) and is used to limit the maximum stroke of the push plate (409) moving toward the side plate (406).

5. The high-voltage plug life testing device simulating off-center load conditions according to claim 4, characterized in that: The mounting post (501) is configured as a cylindrical structure, and the side of the mounting post (501) with an opening faces the push plate (409); a piston plate (601) is slidably connected inside the mounting post (501), and a linkage rod (602) is fixedly connected to one side of the piston plate (601), and the end of the linkage rod (602) away from the piston plate (601) is fixedly connected to the push plate (409); a flow limiting tube (603) is provided on the side of the mounting post (501) away from the opening, and a flow regulating valve (604) is provided on the flow limiting tube (603).

6. The high-voltage plug life testing device simulating off-center load conditions according to claim 5, characterized in that: The slide (8) includes a base plate (801) fixedly connected to the mounting base (413) and an angle slider (807) slidably connected to the arc-shaped guide rail (411). The angle slider (807) is fixedly connected to the base plate (801). An adjusting seat (802) is fixedly connected to the top of the base plate (801). A lifting screw (803) is rotatably connected inside the adjusting seat (802). A scissor drive slider (804) is threadedly connected to the outside of the lifting screw (803). A support platform (706) is connected to the top of the base plate (801) through a scissor structure (81). A slide rail (805) is fixedly connected to the bottom of the support platform (706). A follower block (806) is slidably connected to the outside of the rail (805); the scissor structure (81) includes a first link (811) and a second link (812) that are hinged to each other in an X shape at their middle; the bottom end of the first link (811) is hinged to the base plate (801), and the top end is hinged to the follower block (806); the bottom end of the second link (812) is hinged to the scissor drive slider (804), and the top end is hinged to the bottom of the support platform (706); when the lifting screw (803) drives the scissor drive slider (804) to move horizontally, the height of the support platform (706) is changed by the opening and closing of the first link (811) and the second link (812).

7. The high-voltage plug life testing device simulating off-center load conditions according to claim 6, characterized in that: The clamping assembly (7) includes a clamp seat (701) fixedly connected to the top of the support platform (706). A bidirectional screw (702) is rotatably connected inside the clamp seat (701). Two clamping sliders (703) are symmetrically threaded to the outside of the bidirectional screw (702). Both clamping sliders (703) are slidably connected to the inner wall of the clamp seat (701). A chuck (704) is fixedly connected to the outer wall of both clamping sliders (703). A V-groove (705) is opened on the side of the two chucks (704) that are close to each other. A placement groove (708) is opened on the top of the support platform (706). The two corners of the opening of the placement groove (708) are rounded (707).

8. The high-voltage plug life testing device simulating off-center load conditions according to claim 1, characterized in that: The lifting assembly (2) includes a lead screw (202) vertically mounted on the frame (1), a drive motor (201) for driving the lead screw (202) to rotate, and a lifting slider (203) threadedly connected to the lead screw (202) and sliding in the vertical direction. The lifting platform (204) is fixedly connected to the lifting slider (203). Four guide columns (205) penetrating the lifting platform (204) are provided on the frame (1). The lifting platform (204) is slidably connected to the guide columns (205). The insertion and extraction force detection unit includes a torque detection module mounted on the output end of the drive motor (201) or the lead screw (202) for real-time monitoring of the driving torque when the lead screw (202) rotates. The monitoring and evaluation assembly identifies the axial insertion and extraction force based on the mapping relationship between the driving torque and the axial load.

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