A low-voltage connector mechanical life detection device and method

Abstract

The application 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 joint part, one side of which is provided with an interface; a plug capable of being plugged into and pulled out of the interface; an adjustable buoyancy mechanism connected with the plug and used for controlling the abutting force of the plug after the plug abuts against the joint part; a cross slide rail mechanism connected with the adjustable buoyancy mechanism; and a vertical direction lifting motor. Through accurate regulation and control of the position and abutting force during plug-in and plug-out of the plug, plug-in and plug-out operations under various actual working conditions can be simulated, the defects that a traditional detection device is difficult to simulate actual plug-in and plug-out stress and position changes are overcome, and the accuracy and reliability of low-voltage connector mechanical life detection are significantly improved.

Description

Technical Field

[0001] This application belongs to the field of electronic device testing technology, and specifically relates to a device and method for testing the mechanical life of low-voltage connectors. Background Technology

[0002] Low-voltage connectors generally require mechanical life testing, especially in new energy vehicles where the life requirements for low-voltage connectors are even higher. Existing testing technologies typically employ a method of directly aligning the connector with the center of the interface for insertion and removal. This method idealizes the insertion and removal process of the plug and connector, which differs significantly from actual usage scenarios. In real-world use, users often find it difficult to precisely align the plug with the center of the interface; they usually insert the plug near the interface first and then gradually move it to the interface position by sliding it in. Furthermore, based on usage habits and operational patterns, the closer the plug insertion point is to the interface, the higher the probability of this happening. However, existing testing devices lack the ability to simulate these real insertion and removal behaviors and probability distribution characteristics, resulting in a disconnect between the testing process and actual operating conditions. This makes it impossible to comprehensively and accurately assess the mechanical life of low-voltage connectors under real-world usage conditions, significantly reducing the reference value of the test results. Summary of the Invention

[0003] Based on the above analysis, the present invention aims to provide a device and method for testing the mechanical life of low-voltage connectors, in order to solve the problem that the prior art cannot truly simulate plugging and unplugging conditions.

[0004] The objective of this invention is achieved as follows:

[0005] A low-voltage connector mechanical life testing device, comprising:

[0006] The connector has an interface on one side;

[0007] The plug is capable of being inserted into or removed from the interface.

[0008] An adjustable buoyancy mechanism, connected to the plug, is used to control the magnitude of the contact force after the plug abuts against the connector.

[0009] A cross-shaped slide rail mechanism is connected to the adjustable buoyancy mechanism;

[0010] A vertical lifting motor is connected to the cross slide rail mechanism and is used to drive the cross slide rail mechanism to move in the vertical direction;

[0011] The cross slide rail mechanism is configured to move the plug to a predetermined coordinate point on the connector, and then move it from the coordinate point to the center of the interface to insert the plug into the interface.

[0012] In the low-voltage connector mechanical life testing device provided in this application, the cross slide rail 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, and the first telescopic motor is connected to the driver. The driver is capable of moving on the first track, and the drive rod of the first telescopic motor is capable of telescopic extension and retraction in the y-direction. The x-direction and y-direction are perpendicular to each other and on a horizontal plane. The adjustable buoyancy mechanism is connected to the drive rod of the first telescopic motor.

[0013] In the low-voltage connector mechanical life testing device provided in this application, the adjustable buoyancy mechanism includes a mounting box, an elastic element, a second telescopic motor, and a slide block. The mounting box is connected to the cross slide rail mechanism. The plug is disposed inside the mounting box, with a portion of the plug extending outside the mounting box. An adjustment hole is provided on the side of the plug. The slide block is inserted into the adjustment hole, and the slide block and the adjustment hole are spaced apart in the y-direction, allowing the slide block to move within the adjustment hole. The slide block contacts the top and bottom surfaces of the adjustment hole, and both ends of the slide block slide in contact with the inner wall of the mounting box. The mounting box is arranged along the y-direction, and the slide block can slide along the y-direction within the mounting box. One end of the elastic element is connected to the bottom of the plug, and the other 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 drive rod of the second telescopic motor is inserted into the mounting box and connected to the slide block.

[0014] In the low-voltage connector mechanical life testing device provided in this application, the elastic element includes a plurality of elastic elements, which are arranged along the x-direction at the bottom of the plug. At the same time, the elastic elements are respectively arranged at the positions of the two sides of the bottom of the plug.

[0015] The low-voltage connector mechanical life testing device provided in this application also includes an adjustable base for lifting the connector.

[0016] In the low-voltage connector mechanical life testing device provided in this application, the adjustable base includes a support base, a second track, and clamping members. The second track is disposed on the support base, and the clamping members include two clamping members. The clamping members are slidably connected to the second track. The second track is disposed along the x-direction. The clamping members are driven by a clamping telescopic motor, so that the two clamping members can clamp the connector.

[0017] This application also provides a method for testing the mechanical life of low-voltage connectors, including:

[0018] Set the interface center as the junction point, and pre-define the junction area with the junction point as the center;

[0019] Randomly generate plug points within the mating region, wherein the mating region is located in the xz plane and includes the interface region and the surrounding area of ​​the interface.

[0020] The control plug moves to a preset waiting point in the preparation area of ​​the corresponding engagement area, wherein the preparation area is parallel to the engagement area and the area of ​​the preparation area is larger than that of the engagement area.

[0021] The control plug moves from the waiting point to the insertion point, and then from the insertion point to the engagement point.

[0022] After obtaining the experimental data, the control plug is reset.

[0023] In the low-voltage connector mechanical life testing method provided in this application, the joint area is an elliptical area, the curved edge corresponding to the short axis of the joint area is close to the top and bottom edges of the interface end face of the connector, and the curved edge corresponding to the long axis is close to the two side edges of the interface end face of the connector.

[0024] In the low-voltage connector mechanical life testing method provided in this application, the step of randomly generating mating points within the mating area includes:

[0025] Determine the ellipse parameters and coordinate system corresponding to the joint region;

[0026] The radial distance and angle that conform to the density distribution are generated based on the probability density function. The radial density and angle are then converted into the coordinates of the insertion point in the coordinate system of the joint area. The closer to the joint point, the higher the probability of generating the insertion point.

[0027] In the low-voltage connector mechanical life testing method provided in this application, the step of generating radial distance and angle conforming to the density distribution based on the probability density function includes:

[0028] Based on formula Generate radial distances and angles that conform to the density distribution, where f(x, y) represents the probability density at point (x, y), k represents the normalization constant (the total probability inside the ellipse is 1), σ represents the density decay factor (σ>0, the smaller σ is, the faster the density decays at the center and the fewer the edge points), (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.

[0029] Compared with the prior art, the present invention can achieve at least the following beneficial effects:

[0030] The connector has an interface, which serves as the object for plug insertion and removal operations. An adjustable buoyancy mechanism is connected to the plug, allowing adjustment of the contact force when the plug abuts against the connector according to set requirements. A cross-rail mechanism, based on predetermined coordinates on the connector, first drives the plug to that coordinate point, then precisely moves the plug to the center of the interface to complete the insertion. A vertical lifting motor is connected to the cross-rail mechanism, enabling vertical movement of the mechanism to adjust the plug's height. By precisely controlling the position and contact force during plug insertion and removal, various actual working conditions can be simulated, effectively overcoming the shortcomings of traditional testing devices that struggle to simulate actual insertion and removal forces and positional changes, significantly improving the accuracy and reliability of low-voltage connector mechanical life testing. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this specification or the prior art, the drawings used in the description of the embodiments or 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 those skilled in the art, other drawings can be obtained based on these drawings.

[0032] Figure 1 A schematic diagram of the overall structure of the low-voltage connector mechanical life testing device provided by the present invention;

[0033] Figure 2 for Figure 1 The structural diagram of the adjustable buoyancy mechanism and the cross slide rail mechanism.

[0034] Figure label:

[0035] 10. Connector; 11. Interface; 12. Plug;

[0036] 20. Adjustable buoyancy mechanism; 201. Mounting box; 202. Elastic element; 203. Second telescopic motor; 204. Slide;

[0037] 30. Cross slide rail mechanism; 301. First track; 302. Driver; 303. First telescopic motor;

[0038] 40. Support base; 41. Second track; 42. Clamping component. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. It should be noted that, unless otherwise specified, the implementation methods and features in the implementation methods in this disclosure can be combined, separated, interchanged, and / or rearranged. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0040] In the accompanying drawings, the dimensions and relative dimensions of components may be exaggerated for clarity and / or descriptive purposes. When exemplary embodiments can be implemented differently, a specific process sequence may be performed in a different order than that described. For example, two consecutively described processes may be performed substantially simultaneously or in the reverse order of their description. Furthermore, the same reference numerals denote the same components.

[0041] The terminology used herein is for the purpose of describing particular embodiments and is not intended to be limiting. As used herein, unless the context clearly indicates otherwise, the singular forms “a” and “(the)” are also intended to include the plural forms. Furthermore, when the terms “comprising” and / or “including” and variations thereof are used in this specification, it indicates the presence of the stated features, integrals, steps, operations, parts, components, and / or groups thereof, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, parts, components, and / or groups thereof. It should also be noted that, as used herein, the terms “substantially,” “about,” and other similar terms are used as approximate terms rather than as terms of degree, thus explaining the inherent biases in measurements, calculated values, and / or provided values ​​that would be recognized by one of ordinary skill in the art.

[0042] A specific embodiment of the present invention, such as Figures 1-2 As shown, a low-voltage connector mechanical life testing 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 unplugged from the interface 11; an adjustable buoyancy mechanism 20, connected to the plug 12, for controlling the magnitude of the contact force after the plug 12 abuts against the connector 10; and a cross slide rail mechanism 30, connected to the adjustable buoyancy mechanism 20.

[0043] A vertical lifting motor is connected to the cross slide rail mechanism 30 and is used to drive the cross slide rail mechanism 30 to move in the vertical direction;

[0044] The cross slide mechanism 30 is configured to move the plug 12 to a predetermined coordinate point on the connector 10, and then move it from the coordinate point to the center of the interface 11 to insert the plug 12 into the interface 11.

[0045] The connector 10 serves as the carrier for inserting and removing the plug 12, with its interface 11 being the core component of the insertion and removal operation. The adjustable buoyancy mechanism 20 precisely controls the contact force of the plug 12 against the connector 10 according to pre-set parameters, simulating the subconscious pressure applied by the user during insertion and removal. In the testing process, a waiting point is randomly generated in the preparation area, simulating the initial position of the plug 12 preparing to insert into the interface 11 in daily use. Then, a connection point is generated in the connection area set with the center of the interface 11 as a reference, simulating the position where the plug 12 first contacts the connector 10. The cross slide mechanism 30 moves the plug 12 first to the waiting point, then from the waiting point to the connection point, and then from the connection 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 plug 12 is incorrectly inserted and repositioned to the interface 11 for insertion in daily use. A vertical lifting motor moves the cross slide mechanism 30 vertically, ensuring the plug 12 is at a suitable height to adapt to different testing scenarios.

[0046] By fully simulating the entire process of plug insertion and removal in daily life, including the starting position, the first contact position, repositioning, and the force during insertion, the system achieves precise control over the insertion and removal position, path, and contact force of plug 12. It highly replicates real-world usage scenarios, solves the problem that traditional testing devices cannot simulate complex insertion and removal conditions, and significantly improves the accuracy and reliability of mechanical life testing for low-voltage connectors.

[0047] In other words, a waiting point is first randomly generated in the preparation area, and then the plug 12 is moved to this waiting point to simulate the initial position of the plug 12 preparing to be inserted into the interface 11. Then, a connection point is generated in the connection area to simulate the position where the plug 12 first contacts the connector 10. Then, it is moved from the connection point while a predetermined force is applied to the plug 12. This simulates the effect of repositioning the interface 11 and applying a certain force to the plug 12 after an incorrect insertion during daily use. Applying pressure to the plug 12 is a subconscious reaction of the user, which facilitates the movement of the plug 12 to the interface 11 and insertion.

[0048] The cross slide rail 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, and the first telescopic motor 303 is connected to the driver 302. The driver 302 can move on the first track 301, and the drive rod of the first telescopic motor 303 can extend and retract in the y-direction. The x-direction and y-direction are perpendicular to each other and on a horizontal plane. An adjustable buoyancy mechanism 20 is connected to the drive rod of the first telescopic motor 303.

[0049] The driver 302 has a built-in drive motor and wheel, and the drive motor drives the wheel to move on the first track 301.

[0050] The first track 301 in the cross slide rail 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 extend and retract 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 engagement point generated in the engagement area, and the engagement path at the center of the interface 11, the driver 302 moves in the x-direction, and the first telescopic motor 303 drives the rod to extend and retract 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 engagement point, and smoothly move to the center of the interface 11, ensuring that the plug 12 moves accurately according to the path of simulating daily plugging and unplugging.

[0051] By utilizing a two-dimensional motion mechanism in the x and y directions, high-precision positioning of plug 12 on the horizontal plane is achieved. It can accurately deliver plug 12 to each preset position in strict accordance with the randomness and movement path of the simulated daily plugging and unplugging process, providing a reliable position adjustment guarantee for realistically simulating the actual plugging and unplugging process, and enhancing the simulation capability and practicality of the detection device for real-world usage scenarios.

[0052] The adjustable buoyancy mechanism 20 includes a mounting box 201, an elastic element 202, a second telescopic motor 203, and a slide 204. The mounting box 201 is connected to the cross slide rail mechanism 30. A plug 12 is disposed inside the mounting box 201, with a portion of the plug 12 extending 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, and there is a gap between the slide 204 and the adjustment hole in the y-direction, allowing the slide 204 to move within the adjustment hole. The top and bottom surfaces of the hole are in contact. The two ends of the slide 204 are in sliding contact with the inner wall of the mounting box 201. The mounting box 201 is arranged along the y-direction. The slide 204 can slide along the y-direction inside the mounting box 201. One end of the elastic element 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 connected to the outer bottom of the mounting box 201. The drive rod of the second telescopic motor 203 is inserted into the mounting box 201 and connected to the slide 204.

[0053] The adjustable buoyancy mechanism 20 consists of a mounting box 201, an elastic element 202, a second telescopic motor 203, and a slide 204. The mounting box 201 is connected to the cross slide rail mechanism 30, and the plug 12 is placed inside the mounting box 201 with a partial extension. The adjustment hole on the side of the plug 12 mates with the slide 204, allowing the slide 204 to move in the y-direction and contact the top and bottom surfaces of the adjustment hole, while its two ends slide in contact with the inner wall of the mounting box 201. One end of the elastic element 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 installed on the outer bottom of the mounting box 201, and its drive rod is connected to the slide 204. When the plug 12 moves from the waiting point to the engagement point, it is squeezed due to the pressing pressure. Since the device cannot have the same sensitive force adjustment as a user, an elastic element 202 is provided to prevent damage to the plug 12. Simultaneously, simulating a real-world usage scenario, the user maintains a predetermined force as the plug 12 moves from the engagement point to the center of the interface 11, facilitating insertion of the plug 12 into the interface 11. Through close coordination with the simulated daily plugging and unplugging process, the contact force of the plug 12 at different positions can be flexibly and precisely adjusted. The adaptive fine-tuning of the plug 12 is achieved by utilizing the cooperation between the slide 204 and the adjustment hole, highly replicating the force changes caused by positional deviations during actual plugging and unplugging. This makes the test results more realistically reflect the force conditions of the connector in actual use, significantly improving the effectiveness and authenticity of the test.

[0054] The adjustable force setting is designed to accommodate the different strength levels of adults and younger users, simulating various scenarios.

[0055] The elastic element 202 includes multiple elastic elements 202, which are disposed at the bottom of the plug 12 along the x direction. At the same time, elastic elements 202 are respectively disposed at the two sides of the bottom of the plug 12.

[0056] Multiple elastic elements 202 are arranged along the x-direction at the bottom of the plug 12, and elastic elements 202 are also arranged on both sides. During the insertion and removal process of the plug 12 from the waiting point in the preparation area to the engagement point in the engagement area, and then translating to the center of the interface 11, the multiple elastic elements 202 work together to adjust the elastic force in real time according to the change in the position of the plug 12. When the plug 12 deviates from its position or is subjected to external force, the multiple elastic elements 202 share the force, simulating the actual force on the bottom of the plug 12 during the user's insertion and removal process, ensuring that the plug 12 is subjected to uniform and stable force when inserted and removed at different positions.

[0057] It also includes an adjustable base for supporting the connector 10. The adjustable base supports the connector 10, and its adjustment function allows for adjustment of the connector 10's height, angle, and other positional parameters based on the mating area set with the center of interface 11 as a reference, and the size and shape of connectors 10 of different specifications. This ensures that the connector 10 is in a suitable testing position, allowing the plug 12 to smoothly perform testing operations along a simulated daily insertion / removal path from the preparation area's waiting point to the mating area's mating point, and then to the center of interface 11, adapting to the testing needs of different types of low-voltage connectors.

[0058] Closely integrated with the testing process simulating daily plugging and unplugging, the device effectively improves its versatility and environmental adaptability. It can meet the testing needs of various types of low-voltage connectors in simulated real-world plugging and unplugging scenarios. Regardless of the size or installation angle of the connector 10, it can be adapted via the adjustable base, greatly expanding the device's application range and reducing the limitations of the testing equipment.

[0059] The adjustable base includes a support base 40, a second track 41, and a clamping member 42. The second track 41 is disposed on the support base 40. There are two clamping members 42, which are slidably connected to the second track 41. The second track 41 is disposed 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 connector 10.

[0060] The second track 41 in the adjustable base is set along the x-direction on the support base 40. Two clamping members 42 are slidably connected to the second track 41 and are driven by a clamping telescopic motor. When the plug 12 is tested according to the simulated daily insertion and removal path from the waiting point in the preparation area through the engagement point in the engagement area to the center of the interface 11, the clamping telescopic motor drives the two clamping members 42 to move closer or further apart, firmly clamping the connectors 10 of different specifications. This ensures that the position of the connector 10 remains fixed throughout the testing process, preventing the plug 12 from being affected by movement of the connector 10 and thus ensuring the accuracy and stability of the test.

[0061] By deeply integrating with the testing method that simulates daily insertion and removal, stable clamping and precise positioning of the connector 10 are achieved, effectively ensuring the accuracy of the connector 10's position during simulated actual insertion and removal processes and avoiding testing errors caused by connector 10 displacement. At the same time, it facilitates quick replacement of connectors 10 of different specifications to adapt to diverse testing needs, improve testing efficiency, and ensure the reliability and consistency of test results.

[0062] This application provides a method for testing the mechanical life of low-voltage connectors, including:

[0063] Set the center of interface 11 as the joint point, and preset the joint area with the joint point as the center.

[0064] Randomly generate plug points within the mating area, wherein the mating area is located in the xz plane and includes the interface 11 area and its surrounding area.

[0065] The control plug 12 moves to a preset waiting point in the preparation area of ​​the corresponding engagement area, wherein the preparation area is parallel to the engagement area and the area of ​​the preparation area is larger than that of the engagement area.

[0066] The control plug 12 moves from the waiting point to the insertion point, and then from the insertion point to the engagement point.

[0067] After obtaining the experimental data, control plug 12 is reset.

[0068] In this embodiment, the specific steps include:

[0069] The mating area is an elliptical area. The curved edge corresponding to the short axis of the mating area is close to the top and bottom edges of the end face where the interface 11 of the connector 10 is located, and the curved edge corresponding to the long axis is close to the two sides of the end face where the interface 11 of the connector 10 is located.

[0070] The mating area is an oval-shaped area because when using the plug 12 in daily life, it is usually plugged into both sides of the connector 10, and rarely above or below the interface 11.

[0071] Randomly generating mating points within the mating area includes:

[0072] Determine the ellipse parameters and coordinate system corresponding to the joint region;

[0073] The radial distance and angle that conform to the density distribution are generated based on the probability density function. The radial density and angle are then converted into the coordinates of the insertion point in the coordinate system of the joint area. The closer to the joint point, the higher the probability of generating the insertion point.

[0074] The steps for generating radial distances and angles conforming to a density distribution based on the probability density function include:

[0075] Based on formula Generate radial distances and angles that conform to the density distribution, where f(x, y) represents the probability density at point (x, y), k represents the normalization constant (the total probability inside the ellipse is 1), σ represents the density decay factor (σ>0, the smaller σ is, the faster the density decays at the center and the fewer the edge points), (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.

[0076] This method specifically includes the following steps:

[0077] In the testing process, the center of the interface 11 of the connector 10 is set as the mating point. If the pre-defined mating area centered on the mating point is elliptical, its parameters are as follows:

[0078] The center coordinates of the ellipse are (x0, y0). These coordinates correspond to the junction point and are used to locate the position of the ellipse in the xz plane.

[0079] The semi-major axis 'a' and the semi-minor axis 'b' together determine the shape and size of the ellipse. The edge of the minor axis curve is close to the top and bottom edges of the end face where the connector 10 interface 11 is located, and the edge of the major axis curve is close to the two sides of the end face where the interface 11 is located, thus simulating the possible contact range between the plug 12 and the connector 10 in actual use.

[0080] The equation of the ellipse (with domain constraints) is: .

[0081] Where (x, y) are the coordinates 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, it indicates that the point is inside the ellipse. Establishing this coordinate system provides a positional reference frame for the subsequent generation of random points.

[0082] The probability density function f(x, y) is used to determine the distribution of random points within the elliptical region:

[0083] .

[0084] f(x, y): represents the probability density at point (x, y). Its value directly reflects the probability of generating a random point (i.e., the contact point between the simulated plug 12 and the connector 10) at that point. The larger the value, the higher the probability of generation.

[0085] k: Normalization constant, satisfying .

[0086] : is the density decay factor, and >0. In actual detection simulation, The smaller the value, the faster the center density decays, and the closer it is to the junction point (i.e., the center of the ellipse), the higher the probability of generating random points (i.e., the contact between plug 12 and connector 10). This characteristic simulates the situation in actual use where the central area of ​​interface 11 is more prone to wear due to frequent stress, making the detection more in line with real-world scenarios.

[0087] (x0, y0), a, b: coordinates of the ellipse center, semi-major axis, and semi-minor axis, respectively.

[0088] Generate radial distance and radial probability density function (in polar coordinates):

[0089] After mapping the ellipse to a unit circle through coordinate transformation, the radial distance in unit circle polar coordinates is...

[0090] ,in The probability density function is:

[0091] .

[0092] Generation by inverse transform method:

[0093] Calculate the cumulative distribution function F(r): ,

[0094] Generate uniform random numbers ,make Solving for r, we get:

[0095] .

[0096] If r > 1 (outside the unit circle), discard the result and regenerate until r is less than or equal to 1.

[0097] The angle \theta is generated using a uniform distribution: .

[0098] Since the Gaussian distribution has rotational symmetry and no preference for angle or direction, uniform sampling is sufficient.

[0099] Get r and Then, the coordinates of the insertion point (x, y) in the joint region coordinate system are converted using the following formula:

[0100] .

[0101] This generates random points within the elliptical joint area that conform to a “centrally dense” distribution, simulating the contact position of the plug 12 at the interface 11 of the connector 10 and its surrounding area.

[0102] The generated random points correspond to the insertion points of the plug 12 on the connector 10. In the testing process, the plug 12 first moves to the waiting point in the preparation area, then moves from the waiting point to the randomly generated insertion point, and finally moves to the mating point to complete one insertion action. By repeating this process multiple times, experimental data such as the magnitude of the contact force, the number of insertions and removals, and the degree of wear on the interface 11 are obtained. Because the random points adopt a "center-dense" distribution, it can more realistically simulate the contact between the plug 12 and the connector 10 in actual use, especially the scenario of high-frequency contact in the central area leading to wear, providing data support for accurately assessing the mechanical life of low-voltage connectors.

[0103] It should be noted that the points to be generated are generated randomly, just like the steps for generating random points described above.

[0104] The above specific embodiments further illustrate the purpose, technical solution and beneficial effects of this application. It should be understood that the above are only specific embodiments of this application and are not intended to limit the scope of protection of this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A method for testing the mechanical life of low-voltage connectors, characterized in that, Includes devices for testing the mechanical life of low-voltage connectors: The connector has an interface on one side; The plug is capable of being inserted into or removed from the interface. An adjustable buoyancy mechanism, connected to the plug, is used to control the magnitude of the contact force after the plug abuts against the connector. A cross-shaped slide rail mechanism is connected to the adjustable buoyancy mechanism; A vertical lifting motor is connected to the cross slide rail mechanism and is used to drive the cross slide rail mechanism to move in the vertical direction; The cross slide rail mechanism is configured to move the plug to a predetermined coordinate point on the connector, and then move it from the coordinate point to the center of the interface to insert the plug into the interface. The steps for detection using the above-mentioned device include: Set the interface center as the junction point, and pre-define the junction area with the junction point as the center; Randomly generate plug points within the mating region, wherein the mating region is located in the xz plane and includes the interface region and the surrounding area of ​​the interface. The random generation of mating points within the mating area includes: Determine the ellipse parameters and coordinate system corresponding to the joint region; The radial distance and angle that conform to the density distribution are generated based on the probability density function. The radial density and angle are then converted into the coordinates of the insertion point in the coordinate system of the joint area. The closer to the joint point, the higher the probability of generating the insertion point. The step of generating radial distances and angles conforming to the density distribution based on the probability density function includes: Based on formula Generate radial distances and angles that conform to the density distribution, where f(x, y) represents the probability density at point (x, y), k represents the normalization constant, the total probability inside the ellipse is 1, σ represents the density decay factor, σ>0, the smaller σ is, the faster the density decays at the center and the fewer the edge points, (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. The control plug moves to a preset waiting point in the preparation area of ​​the corresponding engagement area, wherein the preparation area is parallel to the engagement area and the area of ​​the preparation area is larger than that of the engagement area. The control plug moves from the waiting point to the insertion point, and then from the insertion point to the engagement point. After obtaining the experimental data, the control plug is reset.

2. The method for detecting the mechanical life of low-voltage connectors according to claim 1, characterized in that, The cross slide rail 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, and the first telescopic motor is connected to the driver. The driver is capable of moving on the first track, and the drive rod of the first telescopic motor is capable of telescopic extension and retraction in the y-direction. The x-direction and y-direction are perpendicular to each other and on a horizontal plane. The adjustable buoyancy mechanism is connected to the drive rod of the first telescopic motor.

3. The method for detecting the mechanical life of low-voltage connectors according to claim 1, characterized in that, The adjustable buoyancy mechanism includes a mounting box, an elastic element, a second telescopic motor, and a slide. The mounting box is connected to the cross slide rail mechanism. The plug is disposed inside the mounting box, with a portion of the plug extending outside the mounting box. An adjustment hole is provided on the side of the plug. The slide is inserted into the adjustment hole, and the slide and the adjustment hole are spaced apart in the y-direction, allowing the slide to move within the adjustment hole. The slide contacts the top and bottom surfaces of the adjustment hole, and both ends of the slide slide in contact with the inner wall of the mounting box. The mounting box is arranged along the y-direction, and the slide can slide along the y-direction within the mounting box. One end of the elastic element is connected to the bottom of the plug, and the 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 drive rod of the second telescopic motor is inserted into the mounting box and connected to the slide.

4. The method for testing the mechanical life of low-voltage connectors according to claim 3, characterized in that, The elastic element includes multiple elastic elements, which are arranged along the x-direction at the bottom of the plug. At the same time, the elastic elements are respectively arranged at the two sides of the bottom of the plug.

5. The method for detecting the mechanical life of low-voltage connectors according to claim 1, characterized in that, It also includes an adjustable base for lifting the connector.

6. The method for testing the mechanical life of low-voltage connectors according to claim 5, characterized in that, The adjustable base includes a support base, a second track, and clamping components. The second track is disposed on the support base, and the clamping components include two components. The clamping components are slidably connected to the second track. The second track is disposed along the x-direction. The clamping components are driven by a clamping telescopic motor, so that the two clamping components can clamp the connector.

7. The method for detecting the mechanical life of low-voltage connectors according to claim 1, characterized in that, The mating area is an elliptical region. The curved edge corresponding to the short axis of the mating area is close to the top and bottom edges of the end face where the interface of the connector is located, and the curved edge corresponding to the long axis is close to the two sides of the end face where the interface of the connector is located.

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