Device and method for detecting mechanical life of low-voltage connector

Abstract

The invention relates to a low-voltage connector mechanical life detection device and method, and belongs to the technical field of electronic device testing, the low-voltage connector mechanical life detection device comprises a connector piece, one side of which is provided with an interface; the plug can be plugged in and out of the interface; the adjustable buoyancy mechanism is connected with the plug and used for controlling the abutting force after the plug abuts against the connector piece; the cross slide rail mechanism is connected with the adjustable buoyancy mechanism; and the motor is lifted in the vertical direction. Through precise regulation and control of the position and the abutting force in the plug plugging and unplugging process, plugging and unplugging operation under various actual working conditions can be simulated, the defect that a traditional detection device is difficult to simulate actual plugging and unplugging stress and position changes is effectively overcome, and the accuracy and reliability of low-voltage connector mechanical life detection are remarkably improved.

Description

Technical Field

[0001] The present application belongs to the technical field of electronic device testing, and specifically relates to a low-voltage connector mechanical life detection device and method. Background Art

[0002] Low-voltage connectors generally require mechanical life testing, especially since new energy vehicles currently have higher life requirements for low-voltage connectors. Existing detection technologies usually use a detection method that directly aligns with the center of the interface for plugging and unplugging. This method idealizes the plug-in and unplugging process between the plug and the connector, which is significantly different from the actual usage scenario. In actual use, when users operate the plug, it is difficult to accurately align the plug with the center of the interface for insertion. They often insert the plug in the area near the interface first, and then slide the plug to gradually move it to the interface position to complete the insertion. In addition, according to usage habits and operating rules, the closer the plug insertion point is to the interface, the higher the probability of its occurrence. However, due to the lack of simulation capabilities of the above-mentioned real plug-in and unplugging behaviors and probability distribution characteristics of existing detection devices, the detection process is disconnected from the actual working conditions, and it is impossible to comprehensively and accurately evaluate the mechanical life of low-voltage connectors under real usage conditions, which greatly reduces the reference value of the detection results. Summary of the Invention

[0003] In view of the above analysis, the embodiments of the present invention aim to provide a low-voltage connector mechanical life detection device and method to solve the problem in the prior art that it is impossible to truly simulate the plugging and unplugging situation.

[0004] The object of the present invention is achieved like this: A low-voltage connector mechanical life detection device, comprising: A connector piece, one side of which is provided with an interface; A plug capable of being plugged in and out of the interface; An adjustable buoyancy mechanism, connected to the plug, for controlling the abutment force of the plug against the connector; A cross slide mechanism connected to the adjustable buoyancy mechanism; A vertical lifting motor connected to the cross slide mechanism, used to drive the cross slide mechanism to move in the vertical direction; The cross slide mechanism is configured to move the plug to a predetermined coordinate point on the connector, and then move the plug from the coordinate point to the center of the interface to insert the plug into the interface.

[0005] In the low-voltage connector mechanical life detection device provided in the present application, the cross slide mechanism includes a first track arranged along the x-direction and a first telescopic motor arranged along the y-direction, a driver is provided on the first track, the first telescopic motor is connected to the driver, the driver can move on the first track, the driving rod of the first telescopic motor can be telescopic in the y-direction, the x-direction and the y-direction are perpendicular to each other and on the horizontal plane, and the adjustable buoyancy mechanism is connected to the driving rod of the first telescopic motor.

[0006] In the low-voltage connector mechanical life detection device provided in the present application, the adjustable buoyancy mechanism includes a mounting box, an elastic member, a second telescopic motor, and a slide seat. The mounting box is connected to the cross slide mechanism, the plug is arranged in the mounting box, and part of the plug extends outside the mounting box. An adjustment hole is provided on the side of the plug, and the slide seat is inserted into the adjustment hole. There is a gap between the slide seat and the adjustment hole in the y direction, so that the slide seat can move in the adjustment hole. The slide seat contacts the top and bottom surfaces of the adjustment hole, and the two ends of the slide seat are in sliding contact with the inner wall of the mounting box. The mounting box is arranged along the y direction, and the slide seat can slide along the y direction in the mounting box. One end of the elastic member is connected to the bottom of the plug, and the other opposite end is connected to the inner bottom surface of the mounting box. The second telescopic motor is connected to the outer bottom of the mounting box, and the driving rod of the second telescopic motor is inserted into the mounting box and connected to the slide seat.

[0007] In the low-voltage connector mechanical life detection device provided in the present application, the elastic members include multiple ones, and the multiple elastic members are arranged at the bottom of the plug along the x direction. At the same time, the elastic members are respectively arranged at the positions of the two side edges of the bottom of the plug.

[0008] The low-voltage connector mechanical life detection device provided in the present application also includes an adjustable base for dragging the connector.

[0009] In the low-voltage connector mechanical life detection device provided in the present application, the adjustable base includes a bracket seat, a second rail and a clamping member, the second rail is arranged on the bracket seat, the clamping member includes two, the clamping member is slidably connected to the second rail, the second rail is arranged along the x-direction, and the clamping member is driven by a clamping telescopic motor so that the two clamping members can clamp the connector member.

[0010] The present application also provides a low-voltage connector mechanical life detection method, comprising: The center of the interface is set as the joint point, and the joint area is preset with the joint point as the center; randomly generating plug-in points in the joint area, wherein the joint area is located in the xz plane and the joint area includes the interface area and the surrounding area of ​​the interface; The control plug moves to a preset waiting position in a preparation area corresponding to the bonding area, wherein the preparation area is parallel to the bonding area and the area of ​​the preparation area is larger than the bonding area; The control plug moves from the waiting position to the plug point, and from the plug point to the engagement point, After obtaining the experimental data, the control plug is reset.

[0011] In the mechanical life detection method of low-voltage connectors provided in the present application, the joint area is an elliptical area, the curved edges corresponding to the short axis of the joint area are close to the top and bottom edges of the end face where the interface of the connector is located, and the curved edges corresponding to the long axis are close to the two side edges of the end face where the interface of the connector is located.

[0012] In the low-voltage connector mechanical life detection method provided in this application, the randomly generating plug-in points in the joint area includes: Determine the ellipse parameters and coordinate system corresponding to the joint area; Based on the probability density function, radial distances and angles that conform to the density distribution are generated, and the radial density and angles are converted into the coordinates of the plug-in point in the joint area coordinate system. The closer to the joint point, the higher the probability of generating the plug-in point.

[0013] In the low-voltage connector mechanical life detection method provided in this application, the step of generating radial distances and angles that conform to the density distribution based on the probability density function includes: Based on the formula Generate radial distances and angles that conform to the density distribution, where f(x, y) represents the probability density at the point (x, y), k represents the normalization constant (the total probability within the ellipse is 1), σ represents the density attenuation factor (σ>0, the smaller σ is, the faster the central density decays and the fewer edge points there are), (x0, y0) represents the coordinates of the junction point, a represents the semi-length of the major axis, and b represents the semi-length of the minor axis. Compared with the prior art, the present invention can achieve at least the following beneficial effects: The connector has an interface that serves as the object for the plug to be plugged in and out. The adjustable buoyancy mechanism is connected to the plug and can adjust the abutment force when the plug contacts the connector according to the set requirements. The cross-slide mechanism first drives the plug to move to the coordinate point on the predetermined connector and then accurately moves the plug to the center of the interface to complete the insertion. The vertical lifting motor is connected to the cross-slide mechanism and can drive the cross-slide mechanism to move in the vertical direction to adjust the height position of the plug. By precisely controlling the position and abutment force of the plug during insertion and removal, the plugging and removal operations under various actual working conditions can be simulated, effectively overcoming the defect that traditional detection devices have difficulty in simulating actual plugging and removal forces and position changes, and significantly improving the accuracy and reliability of mechanical life detection of low-voltage connectors. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of this specification or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the embodiments of this specification. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0015] Figure 1 This is a schematic diagram of the overall structure of the low-voltage connector mechanical life detection device provided by the present invention; Figure 2 for Figure 1 Schematic diagram of the structure of the adjustable buoyancy mechanism and the cross slide mechanism.

[0016] Reference numerals: 10. Connector; 11. Interface; 12. Plug; 20. Adjustable buoyancy mechanism; 201. Mounting box; 202. Elastic member; 203. Second telescopic motor; 204. Sliding seat; 30. Cross slide mechanism; 301. First track; 302. Driver; 303. First telescopic motor; 40. Bracket seat; 41. Second track; 42. Clamping member. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. It should be noted that, in the absence of conflict, the embodiments in this disclosure and the features in the embodiments can be combined, separated, interchanged and / or rearranged with each other. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0018] In the accompanying drawings, the sizes and relative sizes of components may be exaggerated for clarity and / or descriptive purposes. When the exemplary embodiments can be implemented differently, the specific process sequence may be performed in a different order than described. For example, two processes described in succession may be performed substantially simultaneously or in a reverse order from the described order. In addition, the same reference numerals represent the same components.

[0019] The terms used herein are for the purpose of describing specific embodiments and are not intended to be restrictive. As used herein, unless the context clearly indicates otherwise, the singular forms "one (kind, person)" and "the" are also intended to include plural forms. In addition, when the terms "comprise" and / or "include" and their variations are used in this manual, the features, integral bodies, steps, operations, parts, assemblies and / or their groups stated are indicated, but the presence or addition of one or more other features, integral bodies, steps, operations, parts, assemblies and / or their groups is not excluded. It should also be noted that, as used herein, the terms "substantially", "approximately" and other similar terms are used as approximate terms and not as degree terms, so that they are used to explain the inherent deviations of the measured values, calculated values ​​and / or the values ​​provided that will be recognized by those of ordinary skill in the art.

[0020] A specific embodiment of the present invention, as Figure 1-Figure 2 As shown, a low-voltage connector mechanical life detection device is disclosed, comprising: a connector 10, one side of which is provided with an interface 11; a plug 12, which can be plugged into and out of the interface 11; an adjustable buoyancy mechanism 20, connected to the plug 12, for controlling the abutment force of the plug 12 against the connector 10; a cross slide mechanism 30, connected to the adjustable buoyancy mechanism 20; A vertical lifting motor is connected to the cross slide mechanism 30 and is used to drive the cross slide mechanism 30 to move in the vertical direction; The cross slide mechanism 30 is configured to move the plug 12 to a predetermined coordinate point on the connector 10 , and then move the plug 12 from the coordinate point to the center of the interface 11 to insert the plug 12 into the interface 11 .

[0021] The connector 10 serves as the carrier for plugging and unplugging the plug 12, and its interface 11 is the core part of the plugging and unplugging operation. The adjustable buoyancy mechanism 20 accurately controls the abutment force of the plug 12 against the connector 10 according to pre-set parameters, simulating the user's subconscious application of pressure when plugging and unplugging. In the detection process, a waiting position is first randomly generated in the preparation area to simulate the starting position of the daily plug 12 ready to be inserted into the interface 11; then a joining point is generated in the joining area set with the center of the interface 11 as the reference, simulating the position where the plug 12 first contacts the connector 10. The cross slide mechanism 30 drives the plug 12 to move to the waiting position first, then from the waiting position to the joining point, and then from the joining point to the center of the interface 11. During this process, the adjustable buoyancy mechanism 20 continuously applies a predetermined force to the plug 12, simulating the force situation when the interface 11 is repositioned and inserted after the plug 12 is plugged in incorrectly in daily use. The vertical lifting motor drives the cross slide mechanism 30 to move in the vertical direction to ensure that the plug 12 is at a suitable height to adapt to different detection scenarios. By completely simulating the entire process of daily plugging and unplugging of the plug 12, covering the starting position, first contact position, repositioning and insertion force conditions, it achieves refined control of the plug-in and unplugging position, path and abutment force of the plug 12, highly restores the real usage scenario, solves the problem that traditional detection devices cannot simulate complex plug-in and unplugging conditions, and greatly improves the accuracy and reliability of mechanical life detection of low-voltage connectors.

[0022] That is, a waiting position is first randomly generated in the preparation area, and then the plug 12 is controlled to move to this waiting position, simulating the starting position of the plug 12 in daily use when preparing to be inserted into the interface 11. Then, an engagement point is generated in the engagement area to simulate the position where the plug 12 first contacts the connector 10. The plug 12 is then translated from the engagement point while a predetermined force is applied to the plug 12, simulating the effect of repositioning the interface 11 and applying a certain force to the plug 12 after incorrect insertion in daily use. Applying pressure to the plug 12 is a subconscious reaction of the user, facilitating the movement of the plug 12 to the interface 11 and insertion.

[0023] The cross-slide mechanism 30 includes a first track 301 arranged along the x-direction and a first telescopic motor 303 arranged along the y-direction. A driver 302 is provided on the first track 301. The first telescopic motor 303 is connected to the driver 302. The driver 302 can move on the first track 301. The driving rod of the first telescopic motor 303 can be telescoped in the y-direction. The x-direction and the y-direction are perpendicular to each other and on the horizontal plane. The adjustable buoyancy mechanism 20 is connected to the driving rod of the first telescopic motor 303.

[0024] The driver 302 has a built-in driving motor and wheels, and the driving motor drives the wheels to move on the first track 301 .

[0025] The first track 301 in the cross-slide mechanism 30 is arranged along the x-direction, and the driver 302 can move on the first track 301; the first telescopic motor 303 is connected to the driver 302, and its drive rod can be extended and retracted in the y-direction, and is connected to the adjustable buoyancy mechanism 20. When performing the detection task, based on the waiting point randomly generated in the preparation area, the junction point generated in the junction area, and the junction path at the center of the interface 11, the driver 302 moves in the x-direction and the drive rod of the first telescopic motor 303 extends and retracts in the y-direction. The two work together to accurately adjust the position of the plug 12 in the x and y dimensions on the horizontal plane, so that the plug 12 can accurately reach the waiting point, the junction point, and smoothly translate to the center of the interface 11, ensuring that the plug 12 moves accurately along the path simulating daily plugging and unplugging. With the help of the two-dimensional motion mechanism in the x and y directions, high-precision positioning of the plug 12 on the horizontal plane is achieved. The plug 12 can be accurately delivered to each preset position in strict accordance with the randomness of the position and the movement path during the simulation of daily plugging and unplugging. This provides reliable position adjustment guarantees for realistic simulation of the actual plugging and unplugging process, and enhances the simulation ability and practicality of the detection device for real usage scenarios.

[0026] The adjustable buoyancy mechanism 20 includes a mounting box 201, an elastic member 202, a second telescopic motor 203, and a slide 204. The mounting box 201 is connected to the cross slide mechanism 30. The plug 12 is arranged in the mounting box 201. Part of the plug 12 extends outside the mounting box 201. An adjustment hole is provided on the side of the plug 12. The slide 204 is inserted into the adjustment hole. The slide 204 and the adjustment hole are spaced apart in the y direction so that the slide 204 can move in the adjustment hole. The slide 204 and the adjustment hole are spaced apart in the y direction. The top and bottom surfaces of the hole are in contact, both ends of the slide 204 are in sliding contact with the inner wall of the installation box 201, the installation box 201 is arranged along the y direction, and the slide 204 can slide along the y direction in the installation box 201. One end of the elastic member 202 is connected to the bottom of the plug 12, and the other end is connected to the inner bottom surface of the installation box 201. The second telescopic motor 203 is connected to the outer bottom of the installation box 201, and the driving rod of the second telescopic motor 203 is inserted into the installation box 201 and connected to the slide 204.

[0027] The adjustable buoyancy mechanism 20 consists of a mounting box 201, an elastic member 202, a second telescopic motor 203, and a slide 204. The mounting box 201 is connected to the cross-slide mechanism 30, with the plug 12 positioned within the mounting box 201 and partially extending therefrom. An adjustment hole on the side of the plug 12 engages the slide 204, which is movable in the y-direction and contacts the top and bottom surfaces of the adjustment hole. Both ends of the slide 204 slide in contact with the inner wall of the mounting box 201. One end of the elastic member 202 is connected to the bottom of the plug 12, and the other end is connected to the inner bottom surface of the mounting box 201. The second telescopic motor 203 is mounted on the outer bottom of the mounting box 201, with its drive rod connected to the slide 204. When the plug 12 moves from the waiting position to the engagement point, the plug 12 will be squeezed due to the pressing force. Since the device cannot have the same sensitive force adjustment as the user, the elastic member 202 is provided to prevent the plug 12 from being damaged. At the same time, the real use scenario is simulated. During the process of the plug 12 moving from the engagement point to the center of the interface 11, the user will maintain a predetermined force to facilitate the insertion of the plug 12 into the interface 11. By closely coordinating with the simulation of the daily plugging and unplugging process, the abutment force of the plug 12 at different positions can be flexibly and accurately adjusted. The cooperation between the slide 204 and the adjustment hole can realize the adaptive fine-tuning of the plug 12, and highly restore the force changes caused by the position deviation during the actual plugging and unplugging process of the user, so that the test results more realistically reflect the force conditions of the connector in actual use, significantly improving the effectiveness and authenticity of the test.

[0028] As for the adjustable force setting, it is set separately based on the different strengths possessed by adults and younger users to simulate various scenarios.

[0029] The elastic members 202 include a plurality of elastic members 202 , which are arranged at the bottom of the plug 12 along the x-direction. Elastic members 202 are also arranged at both sides of the bottom of the plug 12 .

[0030] Multiple elastic members 202 are positioned along the x-direction at the bottom of plug 12, and also along its sides. As plug 12 moves from the standby position in the preparation area to the engagement point in the engagement area, and then translates to the center of interface 11 during insertion and removal, the multiple elastic members 202 work together to adjust the elastic force in real time based on the changing position of plug 12. If plug 12 deviates from its position or is subjected to external forces, the multiple elastic members 202 work together to distribute the force, simulating the actual force applied to the bottom of plug 12 during insertion and removal, ensuring uniform and stable force when plugging and removing plug 12 from different positions.

[0031] The device also includes an adjustable base for supporting the connector 10. The adjustable base, used to support the connector 10, adjusts the height, angle, and other positioning parameters of the connector 10 based on the mating area defined relative to the center of the interface 11, as well as the size and shape of the connector 10. This ensures that the connector 10 is in the proper testing position, allowing the plug 12 to smoothly perform testing along a simulated daily insertion and removal path, from the standby point in the preparation area to the mating point in the mating area, and then to the center of the interface 11, meeting the testing requirements of different types of low-voltage connectors. Closely cooperating with the detection process of simulating daily plugging and unplugging, it effectively improves the versatility and environmental adaptability of the detection device, and can meet the detection needs of various types of low-voltage connectors in simulating real plugging and unplugging scenarios. Whether it is a connector 10 of different sizes or different installation angles, it can be adapted through the adjustable base, which greatly broadens the application range of the device and reduces the limitations of the use of the detection equipment. The adjustable base includes a bracket seat 40, a second rail 41 and a clamping member 42. The second rail 41 is set on the bracket seat 40. The clamping member 42 includes two clamping members 42. The clamping members 42 are slidably connected to the second rail 41. The second rail 41 is set along the x direction. The clamping members 42 are driven by a clamping telescopic motor so that the two clamping members 42 can clamp the joint member 10.

[0032] The second track 41 in the adjustable base is positioned on the bracket 40 along the x-direction. Two clamps 42 are slidably connected to the second track 41 and driven by a clamping and telescopic motor. When the plug 12 is tested along a simulated daily plugging and unplugging path from the standby point in the preparation area through the engagement point in the engagement area to the center of the interface 11, the clamping and telescopic motor drives the two clamps 42 toward or away from each other, firmly clamping connectors 10 of different specifications. This ensures that the connector 10 remains fixed in position throughout the testing process, preventing movement of the connector 10 from affecting the plug 12's plugging and unplugging operation along the preset path, thereby ensuring the accuracy and stability of the test. In-depth integration with the detection method of simulating daily plugging and unplugging achieves stable clamping and precise positioning of the connector 10, effectively ensuring the accuracy of the connector 10 position during the simulation of actual plugging and unplugging, and avoiding detection errors caused by displacement of the connector 10. At the same time, it is convenient and quick to replace connectors 10 of different specifications to adapt to diverse detection needs, improve detection efficiency, and ensure the reliability and consistency of detection results.

[0033] The present application provides a method for detecting the mechanical life of a low-voltage connector, comprising: The center of the interface 11 is set as the joint point, and the joint area is preset with the joint point as the center; randomly generating plug-in points in the joint area, wherein the joint area is located in the xz plane and the joint area includes the interface 11 area and the surrounding area of ​​the interface 11; The control plug 12 moves to a preset waiting position in a preparation area corresponding to the bonding area, wherein the preparation area is parallel to the bonding area and the area of ​​the preparation area is larger than the bonding area; The control plug 12 moves from the waiting position to the plug point, and from the plug point to the engagement point, After acquiring the experimental data, the control plug 12 is reset.

[0034] In this embodiment, the specific steps include: The joining area is an elliptical area, and the curved edges corresponding to the short axis of the joining area are close to the top and bottom edges of the end face where the interface 11 of the connector 10 is located, and the curved edges corresponding to the long axis are close to the two side edges of the end face where the interface 11 of the connector 10 is located.

[0035] The joining area is an oval area because in daily use, the plug 12 is usually plugged into both sides of the connector 10 and rarely above or below the interface 11 .

[0036] Randomly generated plug points within the joint area include: Determine the ellipse parameters and coordinate system corresponding to the joint area; Based on the probability density function, radial distances and angles that conform to the density distribution are generated, and the radial density and angles are converted into the coordinates of the plug-in point in the joint area coordinate system. The closer to the joint point, the higher the probability of generating the plug-in point.

[0037] The steps of generating radial distance and angle that conform to density distribution based on probability density function include: Based on the formula Generate radial distances and angles that conform to the density distribution, where f(x, y) represents the probability density at the point (x, y), k represents the normalization constant (the total probability within the ellipse is 1), σ represents the density attenuation factor (σ>0, the smaller σ is, the faster the central density decays and the fewer edge points there are), (x0, y0) represents the coordinates of the junction point, a represents the semi-length of the major axis, and b represents the semi-length of the minor axis.

[0038] In this method, the following steps are specifically included: In the inspection process, the center of the interface 11 of the connector 10 is set as the joint point. If the joint area is elliptical with the joint point as the center, its parameters are as follows: The coordinates of the ellipse center (x0, y0), which correspond to the junction point and are used to locate the position of the ellipse in the xz plane; The major axis semi-length a and the minor axis semi-length b together determine the shape and size of the ellipse, where the edge of the minor axis curve is close to the top and bottom edges of the end face where the interface 11 of the connector 10 is located, and the edge of the major axis curve is close to the two side edges of the end face where the interface 11 is located, thereby simulating the possible contact range between the plug 12 and the connector 10 in actual use.

[0039] The equation of the ellipse (area constraint) is: .

[0040] Where (x, y) is the coordinate of the random point to be generated. This formula represents the normalized sum of squared distances from the point to the center of the ellipse. When this value is less than or equal to 1, the point is inside the ellipse. Once this coordinate system is established, it provides a positional reference framework for subsequent random point generation.

[0041] The probability density function f(x, y) is used to determine the distribution of random points within the elliptical area: .

[0042] f(x, y): represents the probability density at the point (x, y). Its numerical value directly reflects the probability of generating a random point at that point (i.e., the contact point between the simulated plug 12 and the connector 10). The larger the value, the higher the generation probability.

[0043] k: normalization constant, satisfying .

[0044] : is the density attenuation factor, and >0. In the actual detection simulation, The smaller the value, the faster the central density decays. The closer to the joint (i.e., the center of the ellipse), the higher the probability of generating a random point (i.e., contact between plug 12 and connector 10). This feature simulates the situation in actual use, where the central area of ​​interface 11 is more susceptible to wear due to frequent stress, making the detection more realistic.

[0045] (x0, y0), a, b: the coordinates of the ellipse center, the semi-length of the major axis, and the semi-length of the minor axis, respectively.

[0046] Generate radial distance, radial probability density function (in polar coordinates): After the ellipse is mapped to the unit circle through coordinate transformation, the radial distance is ,in The probability density function of is: .

[0047] The inverse transform method generates: Calculate the cumulative distribution function F(r): , Generate uniform random numbers ,make , solving for r yields: .

[0048] If r>1 (outside the unit circle), discard the result and regenerate until r is less than or equal to 1.

[0049] The angle \theta is generated using a uniform distribution: .

[0050] Since the Gaussian distribution has rotational symmetry and no preference for angular direction, uniform sampling is sufficient.

[0051] Get r and Then, it is converted into the plug-in point coordinates (x, y) in the joint area coordinate system using the following formula: .

[0052] Thus, random points conforming to the “center-intensive” distribution are generated within the elliptical joint area, simulating the contact position of the plug 12 at the interface 11 of the connector 10 and its surrounding area.

[0053] The generated random points correspond to the plug-in points of the plug 12 on the connector 10. In the detection process, the plug 12 first moves to the waiting position in the preparation area, then moves from the waiting position to the randomly generated plug-in point, and finally moves to the joint point to complete a plug-in action. By repeating this process many times, experimental data such as the size of the abutment force, the number of plug-in and pull-out times, and the degree of wear of the interface 11 are obtained. Since the random points adopt a "center-intensive" distribution, it can more realistically simulate the contact conditions between the plug 12 and the connector 10 in actual use, especially the scenario where high-frequency contact in the center area causes wear, providing data support for accurately evaluating the mechanical life of low-voltage connectors.

[0054] It should be noted that the waiting point is also randomly generated in the same way as the above steps of generating random points.

[0055] The above specific implementation methods further illustrate the purpose, technical solutions and beneficial effects of this application in detail. It should be understood that the above are only specific implementation methods of this application and are not intended to limit the scope of protection of this application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this application should be included in the scope of protection of this application.

Claims

1. A low voltage connector mechanical life detection device, characterized in that: include: A connector piece, one side of which is provided with an interface; A plug capable of being plugged in and out of the interface; An adjustable buoyancy mechanism, connected to the plug, for controlling the abutment force of the plug against the connector; A cross slide mechanism connected to the adjustable buoyancy mechanism; A vertical lifting motor connected to the cross slide mechanism, used to drive the cross slide mechanism to move in the vertical direction; The cross slide mechanism is configured to move the plug to a predetermined coordinate point on the connector, and then move the plug from the coordinate point to the center of the interface to insert the plug into the interface.

2. The low-voltage connector mechanical life detection device according to claim 1, characterized in that: The cross slide mechanism includes a first track arranged along the x-direction and a first telescopic motor arranged along the y-direction. A driver is provided on the first track. The first telescopic motor is connected to the driver. The driver can move on the first track. The driving rod of the first telescopic motor can be telescoped in the y-direction. The x-direction and the y-direction are perpendicular to each other and on the horizontal plane. The adjustable buoyancy mechanism is connected to the driving rod of the first telescopic motor.

3. The low-voltage connector mechanical life detection device according to claim 1, characterized in that: The adjustable buoyancy mechanism includes an installation box, an elastic member, a second telescopic motor, and a slide seat. The installation box is connected to the cross slide mechanism. The plug is arranged in the installation box, and part of the plug extends outside the installation box. An adjustment hole is provided on the side of the plug. The slide seat is inserted into the adjustment hole. There is a gap between the slide seat and the adjustment hole in the y direction, so that the slide seat can move in the adjustment hole. The slide seat contacts the top and bottom surfaces of the adjustment hole, and both ends of the slide seat are in sliding contact with the inner wall of the installation box. The installation box is arranged along the y direction, and the slide seat can slide along the y direction in the installation box. One end of the elastic member is connected to the bottom of the plug, and the other opposite end is connected to the inner bottom surface of the installation box. The second telescopic motor is connected to the outer bottom of the installation box, and the driving rod of the second telescopic motor is inserted into the installation box and connected to the slide seat.

4. The low-voltage connector mechanical life detection device according to claim 3, characterized in that: The elastic members include a plurality of elastic members, which are arranged at the bottom of the plug along the x direction. Meanwhile, the elastic members are respectively arranged at both sides of the bottom of the plug.

5. The low-voltage connector mechanical life detection device according to claim 1, characterized in that: An adjustable base is also included for towing the joint member.

6. The low-voltage connector mechanical life detection device according to claim 5, characterized in that: The adjustable base includes a bracket seat, a second track and a clamping member, the second track is arranged on the bracket seat, the clamping member includes two, the clamping member is slidably connected to the second track, the second track is arranged along the x-direction, and the clamping member is driven by a clamping telescopic motor so that the two clamping members can clamp the joint member.

7. A method for detecting the mechanical life of a low-voltage connector, characterized in that: include: The center of the interface is set as the joint point, and the joint area is preset with the joint point as the center; randomly generating plug-in points in the joint area, wherein the joint area is located in the xz plane and the joint area includes the interface area and the surrounding area of ​​the interface; The control plug moves to a preset waiting position in a preparation area corresponding to the bonding area, wherein the preparation area is parallel to the bonding area and the area of ​​the preparation area is larger than the bonding area; The control plug moves from the waiting position to the plug point, and from the plug point to the engagement point, After obtaining the experimental data, the control plug is reset.

8. The low-voltage connector mechanical life detection method according to claim 7, characterized in that: The joint area is an elliptical area, the curved edges corresponding to the short axis of the joint area are close to the top and bottom edges of the end face where the interface of the connector is located, and the curved edges corresponding to the long axis are close to the two side edges of the end face where the interface of the connector is located.

9. The low-voltage connector mechanical life detection method according to claim 7, characterized in that: The randomly generating the plug-in points in the joint area includes: Determine the ellipse parameters and coordinate system corresponding to the joint area; Based on the probability density function, radial distances and angles that conform to the density distribution are generated, and the radial density and angles are converted into the coordinates of the plug-in point in the joint area coordinate system. The closer to the joint point, the higher the probability of generating the plug-in point.

10. The low-voltage connector mechanical life detection method according to claim 9, characterized in that: The step of generating radial distances and angles that conform to density distribution based on the probability density function includes: Based on the formula Generate radial distances and angles that conform to the density distribution, where f(x, y) represents the probability density at the point (x, y), k represents the normalization constant (the total probability within the ellipse is 1), σ represents the density attenuation factor (σ>0, the smaller σ is, the faster the central density decays and the fewer edge points there are), (x0, y0) represents the coordinates of the junction point, a represents the semi-length of the major axis, and b represents the semi-length of the minor axis.

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