Grounding spring contact resistance measuring device

Abstract

The utility model discloses a grounding elastic sheet contact resistance measuring device, which comprises a first conductive piece, a second conductive piece, a limiting piece, a first measuring line and a second measuring line, and is characterized in that the first conductive piece and the second conductive piece are used for abutting against the grounding elastic sheet from two sides of the grounding elastic sheet so as to compress the grounding elastic sheet; the limiting piece is arranged between the first conductive piece and the second conductive piece and is used for limiting the distance between the first conductive piece and the second conductive piece so as to control the compression amount of the grounding elastic piece; the first measuring line is connected with the first conductive piece, the second measuring line is connected with the second conductive piece, and the first measuring line and the second measuring line are used for measuring the resistance of the grounding elastic piece. According to the utility model, the contact resistance value of the grounding elastic sheet under the specific compression amount can be accurately measured, and the measurement precision of the contact resistance of the grounding elastic sheet is improved.

Description

Technical Field

[0001] This utility model relates to the field of resistance measurement technology, specifically to a grounding spring contact resistance measuring device. Background Technology

[0002] In vehicle electric drive products, to prevent charge accumulation and electrostatic interference, a spring clip, often referred to as a grounding spring clip, is typically installed between the two different housings. During installation, the two housings press against the grounding spring clip, causing it to elastically abut against the two housings, thereby achieving conductivity between the two housings of the electric drive product.

[0003] Since the compression of the grounding spring affects the contact state between the grounding spring and the housing, the compression of the grounding spring also affects the contact resistance between them. In related technologies, the compression of the grounding spring cannot be precisely controlled during the contact resistance measurement process, resulting in low measurement accuracy. Utility Model Content

[0004] This utility model aims to at least partially solve one of the technical problems in the related art.

[0005] Therefore, this utility model proposes a grounding spring contact resistance measuring device.

[0006] The grounding spring contact resistance measuring device of this utility model includes a first conductive element, a second conductive element, a limiting element, a first measuring line, and a second measuring line. The first conductive element and the second conductive element are used to abut against the grounding spring from both sides to compress the grounding spring. The limiting element is disposed between the first conductive element and the second conductive element to limit the distance between the first conductive element and the second conductive element, so as to control the compression amount of the grounding spring. The first measuring line is connected to the first conductive element, and the second measuring line is connected to the second conductive element. The first measuring line and the second measuring line are used to measure the resistance of the grounding spring.

[0007] Optionally, at least one of the first conductive member and the second conductive member is provided with a plurality of limiting holes of different depths that are adapted to the limiting member, so as to adjust the distance between the first conductive member and the second conductive member by changing the fit between the limiting member and different limiting holes.

[0008] Optionally, the limiting hole is a blind hole.

[0009] Optionally, the limiting hole is a threaded hole, and the limiting member is a threaded rod. The threaded rod cooperates with the threaded hole to adjust the distance between the first conductive member and the second conductive member by rotating the threaded rod.

[0010] Optionally, the grounding spring contact resistance measuring device of this disclosure further includes a first fixing frame and a second fixing frame, the first conductive element is disposed on the first fixing frame, the second conductive element is disposed on the second fixing frame, and the first fixing frame and the second fixing frame are connected by a first fastener.

[0011] Optionally, the first fixing bracket is provided with a first connecting threaded hole, the second fixing bracket is provided with a second connecting threaded hole, the first fastener is a screw, and the screw cooperates with the first connecting threaded hole and the second connecting threaded hole to connect the first fixing bracket and the second fixing bracket.

[0012] Optionally, the limiting member is a sleeve, which is sleeved on the screw. The first end of the sleeve abuts against the first fixing frame, and the second end of the sleeve abuts against the second fixing frame, so as to limit the distance between the first conductive member and the second conductive member.

[0013] Optionally, the sleeve includes a plurality of sleeve rings stacked in sequence, so as to adjust the distance between the first conductive element and the second conductive element by changing the number of sleeve rings.

[0014] Optionally, a first electrical insulating element is provided between the first fixing frame and the first conductive element; and / or a second electrical insulating element is provided between the second fixing frame and the second conductive element.

[0015] Optionally, the first fixing frame is provided with a first limiting block, the first electrical insulating component has a first limiting groove with an opening facing the first fixing frame, and a portion of the first limiting block is fitted into the first limiting groove; and / or the second fixing frame is provided with a second limiting block, the second electrical insulating component has a second limiting groove with an opening facing the second fixing frame, and a portion of the second limiting block is fitted into the second limiting groove.

[0016] Optionally, the first electrical insulating member has a third limiting groove with an opening facing the first conductive member, and at least a portion of the first conductive member is fitted within the third limiting groove; and / or the second electrical insulating member has a fourth limiting groove with an opening facing the second conductive member, and at least a portion of the second conductive member is fitted within the fourth limiting groove.

[0017] Optionally, the grounding spring contact resistance measuring device of this embodiment further includes a first pressing block and a second fastener. The first pressing block is connected to the first conductive element through the second fastener. The first pressing block is pressed onto the first limiting block in the direction toward the first conductive element. A first electrical insulating sheet is provided between the first pressing block and the first limiting block. And / or the grounding spring contact resistance measuring device further includes a second pressing block and a third fastener. The second pressing block is connected to the second conductive element through the third fastener. The second pressing block is pressed onto the second limiting block in the direction toward the second conductive element. A second electrical insulating sheet is provided between the second pressing block and the second limiting block.

[0018] Optionally, the first pressing block has a first groove with an opening facing the first limiting block, and a portion of the first limiting block is fitted into the first groove; and / or the second pressing block has a second groove with an opening facing the second limiting block, and a portion of the second limiting block is fitted into the second groove.

[0019] Optionally, the first electrical insulating component is provided with a first through hole that mates with the second fastener; and / or the second electrical insulating component is provided with a second through hole that mates with the third fastener.

[0020] Optionally, the first measuring line includes a first current line and a first voltage line, and the second measuring line includes a second current line and a second voltage line. The first voltage line and the second voltage line are used to measure the potential difference between the first conductive element and the second conductive element, and the first current line and the second current line are used to measure the current difference between the first conductive element and the second conductive element.

[0021] Optionally, the grounding spring contact resistance measuring device of this disclosure further includes a first pressure plate and a fourth fastener. The first pressure plate is connected to the first conductive element through the four fasteners, and the first pressure plate presses one end of the first current line and the first voltage line onto the first conductive element; and / or the grounding spring contact resistance measuring device further includes a second pressure plate and a fifth fastener. The second pressure plate is connected to the second conductive element through the fifth fastener, and the second pressure plate presses one end of the second current line and the second voltage line onto the second conductive element.

[0022] Optionally, the surface of the first conductive element facing the first fixing frame is provided with a first recess, and the first pressure plate is disposed in the first recess to press one end of the first current line and the first voltage line onto the bottom surface of the first recess; and / or the surface of the second conductive element facing the second fixing frame is provided with a second recess, and the second pressure plate is disposed in the second recess to press one end of the second current line and the second voltage line onto the bottom surface of the second recess.

[0023] Optionally, the first fixing frame, the first electrical insulating component, and the first conductive component are annular frames with adapted outer peripheral contours; and / or the second fixing frame, the second electrical insulating component, and the second conductive component are annular frames with adapted outer peripheral contours.

[0024] Optionally, the grounding spring contact resistance measuring device of this utility model further includes a connecting plate and a fixed base. The connecting plate is connected to the first fixed frame, and the connecting plate is provided with a connector for connecting to a tensile and compressive testing machine. The fixed base is connected to the second fixed frame.

[0025] The grounding spring contact resistance measuring device of this embodiment features a limiting member positioned between the first and second conductive members. This allows for precise control of the compression of the grounding spring during contact resistance measurement. Therefore, the contact resistance value of the grounding spring under a specific compression can be measured using the first and second measuring lines, thus improving the measurement accuracy of the grounding spring contact resistance. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the grounding spring contact resistance measuring device according to an embodiment of the present invention.

[0027] Figure 2 This is a schematic diagram of the grounding spring contact resistance measuring device according to an embodiment of the present invention.

[0028] Figure 3 This is an exploded view of the grounding spring contact resistance measuring device according to an embodiment of the present invention.

[0029] Figure 4 This is a partial structural schematic diagram of an embodiment of the present utility model.

[0030] Figure 5 This is a partial structural schematic diagram of an embodiment of the present utility model.

[0031] Figure 6 This is a schematic diagram of the installation of the first and second measuring lines according to an embodiment of the present invention.

[0032] Price shown in the attached chart:

[0033] 100. Grounding spring contact resistance measuring device; 200. Grounding spring; 1. First conductive element; 101. First recess; 2. Second conductive element; 201. Second recess; 3. Limiting element; 4. First measuring line; 401. First current line; 402. First voltage line; 5. Second measuring line; 501. Second current line; 502. Second current line; 6. First fixing frame; 601. First limiting block; 7. Second fixing frame; 701. Second limiting block; 8. First fastener; 9. First electrical insulating element; 901. First limiting groove; 902. 10. Third limiting groove; 1001. First through hole; 10. Second electrical insulating component; 1002. Second limiting groove; 1003. Fourth limiting groove; 1004. Second through hole; 11. First pressure block; 1105. First groove; 12. Second fastener; 13. First electrical insulating sheet; 14. Second pressure block; 1406. Second groove; 15. Third fastener; 16. Second electrical insulating sheet; 17. First pressure plate; 18. Fourth fastener; 19. Second pressure plate; 20. Fifth fastener; 21. Connecting plate; 22. Fixed base; 23. Connecting component. Detailed Implementation

[0034] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0035] like Figures 1 to 6 As shown, the grounding spring contact resistance measuring device 100 of this embodiment includes a first conductive element 1, a second conductive element 2, a limiting element 3, a first measuring line 4, and a second measuring line 5. The first conductive element 1 and the second conductive element 2 are used to abut against the grounding spring 200 from both sides to compress it. The limiting element 3 is disposed between the first conductive element 1 and the second conductive element 2 to limit the distance between them, thereby controlling the amount of compression of the grounding spring 200. The first measuring line 4 is connected to the first conductive element 1, and the second measuring line 5 is connected to the second conductive element 2. The first measuring line 4 and the second measuring line 5 are used to measure the resistance of the grounding spring 200.

[0036] In use, the grounding spring contact resistance measuring device 100 of this embodiment places the first conductive element 1 and the second conductive element 2 on both sides of the grounding spring 200 to be measured, and applies pressure to the grounding spring 200 to compress it, thereby simulating the squeezing effect of different housings on the grounding spring 200 in the actual installation process of the electric drive product. Since the limiting element 3 is set between the first conductive element 1 and the second conductive element 2, the distance between the two conductive elements is limited, thereby accurately controlling the compression amount of the grounding spring 200. The first measuring line 4 and the second measuring line 5 are respectively connected to the first conductive element 1 and the second conductive element 2 and are used to connect to the measuring instrument, which can measure the current and voltage between the first conductive element 1, the grounding spring 200 and the second conductive element 2. By calculating the ratio of voltage to current, the contact resistance value between the grounding spring 200 and the first conductive element 1 and the second conductive element 2 can be calculated.

[0037] The grounding spring contact resistance measuring device 100 of this embodiment features a limiting member 3 positioned between the first conductive member 1 and the second conductive member 2. This allows the limiting member 3 to precisely control the compression of the grounding spring 200 during contact resistance measurement. Therefore, the contact resistance value of the grounding spring 200 under a specific compression can be measured using the first measuring line 4 and the second measuring line 5, thus improving the measurement accuracy of the grounding spring contact resistance.

[0038] Furthermore, by accurately measuring the contact resistance value of the grounding spring 200 under a specific compression, important data support can be provided for the design of electric drive products, helping engineers optimize product design and performance.

[0039] In some embodiments, at least one of the first conductive element 1 and the second conductive element 2 is provided with a plurality of limiting holes (not shown in the figure) of different depths that are adapted to the limiting element 3, so as to adjust the distance between the first conductive element 1 and the second conductive element 2 by changing the fit between the limiting element 3 and the different limiting holes.

[0040] For example, a limiting hole may be provided on the first conductive element 1, or on the second conductive element 2, or both the first conductive element 1 and the second conductive element 2 may be provided with limiting holes.

[0041] Depending on the actual measurement requirements, the distance between the two conductive components can be adjusted by selecting different limiting holes. The limiting component 3 can be adapted to these limiting holes, so that during device assembly, a suitable limiting hole can be selected to fix the position of the limiting component 3 as needed, thereby achieving different compression amounts. Therefore, the grounding spring contact resistance measuring device 100 of this embodiment, by changing the fit between the limiting holes and the limiting component 3, can be applied to the measurement requirements of the grounding spring 200 contact resistance under various compression amounts, exhibiting good versatility.

[0042] Optionally, the limiting hole is a blind hole.

[0043] In other embodiments, the limiting hole is a threaded hole, and the limiting member 3 is a threaded rod. The threaded rod cooperates with the threaded hole to adjust the distance between the first conductive member 1 and the second conductive member 2 by rotating the threaded rod.

[0044] Threaded engagement provides a simple and effective method for precisely controlling the distance between two conductive parts. It allows for minute distance adjustments; by rotating the threaded rod, the operator can easily adjust the distance without complex tools or skills, simplifying the operation. The design of the threaded rod and threaded hole allows for multiple adjustments within a certain range, making it possible to accommodate different sizes and types of grounding springs 200. The precision of the threaded engagement reduces errors caused by manual adjustments, improving the overall accuracy of the measurement.

[0045] In some embodiments, the grounding spring contact resistance measuring device 100 of this utility model further includes a first fixing frame 6 and a second fixing frame 7, a first conductive element 1 is disposed on the first fixing frame 6, a second conductive element 2 is disposed on the second fixing frame 7, and the first fixing frame 6 and the second fixing frame 7 are connected by a first fastener 8.

[0046] like Figure 4 and Figure 5 As shown, the first fixing bracket 6 and the second fixing bracket 7 are used to fix the first conductive element 1 and the second conductive element 2, respectively. These two fixing brackets provide a stable support structure, ensuring that the conductive elements do not shift during measurement. The first fixing bracket 6 and the second fixing bracket 7 are connected by a first fastener 8 (e.g., bolt, nut, etc.). This fastening method ensures that the connection between the two fixing brackets is both secure and adjustable, facilitating adjustments when necessary.

[0047] The design of the mounting bracket enhances the stability of the entire measuring device, preventing displacement due to vibration or external forces during measurement, thus ensuring the accuracy of the measurement results. Thanks to the use of the mounting bracket and fasteners, the device can be repeatedly assembled and disassembled while maintaining its original accuracy, improving the repeatability of the measurement process. The mounting bracket, connected by fasteners, allows for adjustment of the distance between conductive elements as needed to accommodate different types of grounding springs 200. The mounting bracket design simplifies the installation of conductive elements; simply fix the conductive element to the corresponding mounting bracket and connect the two brackets with fasteners.

[0048] Optionally, the first fixing frame 6 is provided with a first connecting threaded hole, the second fixing frame 7 is provided with a second connecting threaded hole, and the first fastener 8 is a screw rod, which cooperates with the first connecting threaded hole and the second connecting threaded hole to connect the first fixing frame 6 and the second fixing frame 7.

[0049] The screw, acting as a fastener, engages with the threaded holes on the two mounting brackets. By rotating the screw, the first mounting bracket 6 and the second mounting bracket 7 can be securely connected together. The threaded connection provides a very stable connection method, capable of withstanding certain external forces and preventing loosening of the device due to vibration or other reasons during measurement. The tightness of the threaded connection ensures that the distance between conductive parts remains constant, thereby improving the reliability of contact resistance measurement. The threaded connection allows for fine-tuning of the distance between the two mounting brackets when necessary to accommodate different sizes and types of grounding springs 200. Connection is achieved by rotating the screw, making operation simple, requiring no special tools, and facilitating quick installation and disassembly. The threaded connection has excellent durability, maintaining its connection effect over long-term use and reducing maintenance costs.

[0050] In some embodiments, the limiting member 3 is a sleeve, which is sleeved on the screw. The first end of the sleeve abuts against the first fixing frame 6, and the second end of the sleeve abuts against the second fixing frame 7, so as to limit the distance between the first conductive member 1 and the second conductive member 2.

[0051] like Figure 3 As shown, the sleeve, as a limiting member 3, is sleeved on the screw, and its two ends abut against the first fixed frame 6 and the second fixed frame 7 respectively, so that the screw can limit the sleeve and prevent the limiting member 3 from shifting position during the measurement process, which would cause a change in the compression of the grounding spring 200, thus improving the measurement reliability of the grounding spring contact resistance measuring device 100 of this utility model embodiment.

[0052] In some embodiments, the sleeve includes a plurality of sleeve rings stacked in sequence to adjust the distance between the first conductive element 1 and the second conductive element 2 by changing the number of sleeve rings.

[0053] By adding or removing the sleeve ring, the length of the sleeve can be precisely adjusted, thereby controlling the distance between the first conductive element 1 and the second conductive element 2, and thus changing the compression of the grounding spring 200, increasing the flexibility of adjustment. Because the sleeve ring replacement process is simple, the operator can quickly adjust the compression without requiring complex tools or specialized skills.

[0054] In some embodiments, a first electrical insulating element 9 is provided between the first fixing frame 6 and the first conductive element 1.

[0055] The first electrical insulating component 9 is located between the first fixing frame 6 and the first conductive component 1. Its function is to prevent electrical connection between the two components while physically connecting them, thereby avoiding interference from the first fixing frame 6 to the measurement results during the measurement process and further improving the accuracy of the measurement results.

[0056] In some embodiments, a second electrical insulating member 10 is provided between the second fixing frame 7 and the second conductive member 2.

[0057] The second electrical insulator 10 is located between the first fixing frame 6 and the first conductive component 2. Its function is to prevent electrical connection between the two components while physically connecting them, thereby avoiding interference from the second fixing frame 7 to the measurement results during the measurement process and further improving the accuracy of the measurement results.

[0058] In some embodiments, the first fixing frame 6 is provided with a first limiting block 601, and the first electrical insulating member 9 has a first limiting groove 901 with an opening facing the first fixing frame 6, and a portion of the first limiting block 601 is fitted into the first limiting groove 901.

[0059] like Figure 4 As shown, the first limiting block 601 and the first limiting groove 901 work together to fix the position of the first electrical insulator 9 in the first fixing frame 6, prevent the first electrical insulator 9 from shifting during the measurement process, ensure that the first electrical insulator 9 will not move due to vibration or external force during the measurement process, and improve the stability of the entire device.

[0060] In some embodiments, the second fixing frame 7 is provided with a second limiting block 701, and the second electrical insulating member 10 has a second limiting groove 1001 with an opening facing the second fixing frame 7, and a portion of the second limiting block 701 is fitted into the second limiting groove 1001.

[0061] like Figure 4 As shown, the second limiting block 701 and the second limiting groove 1001 work together to fix the position of the second electrical insulator 10 in the second fixing frame 7, prevent the second electrical insulator 10 from shifting during the measurement process, ensure that the second electrical insulator 10 will not move due to vibration or external force during the measurement process, and improve the stability of the entire device.

[0062] In some embodiments, the first electrical insulating member 9 has a third limiting groove 902 with an opening facing the first conductive member 1, and at least a portion of the first conductive member 1 is fitted within the third limiting groove 902.

[0063] like Figure 3 As shown, the shape and size of the third limiting groove 902 are adapted to the outer peripheral contour dimensions of the first conductive element 1. At least a portion of the first conductive element 1 fits within the third limiting groove 902, which ensures that the first conductive element 1 is fixed in position on the first electrical insulator 9. The first electrical insulator 9 not only serves to electrically isolate the first conductive element 1 from the first fixing bracket 6, but also serves to fix the position of the first conductive element 1, preventing it from moving during measurement, thereby improving the stability of the entire measuring device.

[0064] In some embodiments, the second electrical insulating member 10 has a fourth limiting groove 1002 with an opening facing the second conductive member 2, and at least a portion of the second conductive member 2 is fitted into the fourth limiting groove 1002.

[0065] like Figure 3 As shown, the shape and size of the fourth limiting groove 1002 are adapted to the outer peripheral contour dimensions of the second conductive element 2. At least a portion of the second conductive element 2 fits within the fourth limiting groove 1002, which ensures that the second conductive element 2 is fixed in position on the second electrical insulator 10. The second electrical insulator 10 not only serves to electrically isolate the second conductive element 2 and the second fixing bracket 7, but also serves to fix the position of the second conductive element 2, preventing it from moving during measurement, thereby improving the stability of the entire measuring device.

[0066] In some embodiments, the grounding spring contact resistance measuring device 100 of this utility model further includes a first pressing block 11 and a second fastener 12. The first pressing block 11 is connected to the first conductive member 1 through the second fastener 12. The first pressing block 11 is pressed onto the first limiting block 601 in the direction toward the first conductive member 1, and a first electrical insulating sheet 13 is provided between the first pressing block 11 and the first limiting block 601.

[0067] like Figure 4 As shown, for example, the second fastener 2 is a screw or bolt. The first pressure block 11 is connected to the first conductive element 1 through the second fastener 12. Since the first pressure block 11 is pressed onto the first limiting block 601, the connection between the first fixing frame 6 and the first conductive element 1 is realized. Furthermore, since a first electrical insulating sheet 13 is provided between the first pressure block 11 and the first limiting block 601, the first pressure block 11 and the first limiting block 601 are isolated, preventing the first fixing frame 6 and the first conductive element 1 from interfering with the measurement results due to electrical connection through the second fastener 12.

[0068] In some embodiments, the grounding spring contact resistance measuring device 100 further includes a second pressing block 14 and a third fastener 15, wherein the second pressing block 14 is connected to the second conductive member 2 via the third fastener 15. The second pressing block 14 is pressed onto the second limiting block 701 in a direction toward the second conductive member 2, and a second electrical insulating sheet 16 is provided between the second pressing block 14 and the second limiting block 701.

[0069] like Figure 5As shown, for example, the second fastener 2 is a screw or bolt. The second pressure block 14 is connected to the second conductive element 2 via the third fastener 15. Since the second pressure block 14 is pressed onto the second limiting block 701, the connection between the second fixing frame 7 and the second conductive element 2 is achieved. Furthermore, since a second electrical insulating sheet 116 is provided between the second pressure block 14 and the second limiting block 701, the second pressure block 14 and the second limiting block 701 are isolated, preventing the first fixing frame 6 and the first conductive element 1 from interfering with the measurement results due to electrical connection via the third fastener 15.

[0070] Optionally, the first pressing block 11 is provided with a first groove 1101 with an opening facing the first limiting block 601, and a portion of the first limiting block 601 is fitted into the first groove.

[0071] like Figure 4 As shown, a portion of the first limiting block 601 fits into the groove of the first pressing block 11. This fit is designed to fix the position of the first limiting block 601 on the first pressing block 11. Since a portion of the first limiting block 601 is fixed in the groove of the first pressing block 11, it can be ensured that the first pressing block 11 will not move due to vibration or external force during the measurement process, thus improving the stability of the device.

[0072] Optionally, the second pressing block 14 is provided with a second groove 1401 with an opening facing the second limiting block 701, and a portion of the second limiting block 701 is fitted into the second groove 1401.

[0073] like Figure 5 As shown, a portion of the second limiting block 701 fits into the groove of the second pressure block 14. This fit is designed to fix the position of the second limiting block 701 on the second pressure block 14. Since a portion of the second limiting block 701 is fixed in the groove of the second pressure block 14, it can be ensured that the second pressure block 14 will not move due to vibration or external force during the measurement process, thus improving the stability of the device.

[0074] Optionally, the first electrical insulator 9 is provided with a first through hole 903 that mates with the second fastener 12.

[0075] like Figure 4 As shown, the first electrical insulator 9 is provided with a first through hole 903, which cooperates with the second fastener 12 (such as a bolt, screw, etc.) to fix the position of the first electrical insulator 9 and improve the stability of the whole device.

[0076] Optionally, the second electrical insulator 10 is provided with a second through hole 1003 that mates with the third fastener 15.

[0077] like Figure 5As shown, a second through hole 1003 is designed on the second electrical insulator 10. This through hole cooperates with the third fastener 15 (such as a bolt, screw, etc.) to fix the position of the second electrical insulator 10, thereby improving the stability of the entire device.

[0078] In some embodiments, the first measuring line 4 includes a first current line 401 and a first voltage line 402, and the second measuring line 5 includes a second current line 501 and a second voltage line. The first voltage line 402 and the second voltage line are used to measure the potential difference between the first conductive element 1 and the second conductive element 2, and the first current line 401 and the second current line 501 are used to measure the current difference between the first conductive element 1 and the second conductive element 2.

[0079] The first voltage line 401 and the second voltage line 402 are electrically connected to the voltage output and input terminals of the measuring instrument, respectively, and are used to measure the potential difference among the first conductive element 1, the grounding spring 200, and the second conductive element 2. The first current line 501 and the second current line 502 are electrically connected to the current output and input terminals of the measuring instrument, respectively, and are used to measure the current difference among the first conductive element 1, the grounding spring 200, and the second conductive element 2. The contact resistance value of the grounding spring 200 is obtained by calculating the ratio of voltage to current. By simultaneously measuring current and voltage through the first measuring line 4 and the second measuring line 5, the contact resistance of the grounding spring 200 can be accurately calculated, ensuring the accuracy of the measurement results.

[0080] In some embodiments, the grounding spring 200 contact resistance measuring device of this utility model further includes a first pressure plate 17 and a fourth fastener 18. The first pressure plate 17 is connected to the first conductive element 1 through the fourth fastener 18. The first pressure plate 17 presses one end of the first current line 401 and the first voltage line 402 onto the first conductive element 1.

[0081] like Figure 6 As shown, the first pressure plate 17 is part of the device. It is connected to the first conductive element 1 and is used to press one end of the first current line 401 and the first voltage line 402 onto the first conductive element 1. The first pressure plate 17 is connected to the first conductive element 1 by a fourth fastener 18 (such as a bolt, screw, etc.), which ensures the stability of the first pressure plate 17 during the measurement process.

[0082] The first pressure plate 17 presses one end of the first current line 401 and the first voltage line 402 onto the first conductive element 1, ensuring a stable connection between the first current line 401 and the first voltage line 402 and the first conductive element 1, reducing the possibility of loosening or disconnection. Since the connection between the current line and the voltage line and the first conductive element 1 is fixed, the stability of the current and voltage signals during measurement is ensured, thereby improving the accuracy of contact resistance measurement.

[0083] In some embodiments, the grounding spring contact resistance measuring device 100 further includes a second pressure plate 19 and a fifth fastener 20. The second pressure plate 19 is connected to the second conductive element 2 through the fifth fastener 20. The second pressure plate 19 presses one end of the second current line 501 and the second voltage line onto the second conductive element 2.

[0084] like Figure 6 As shown, the second pressure plate 19 is part of the device. It is connected to the second conductive element 2 and is used to press one end of the second current line 501 and the second voltage line 502 onto the second conductive element 2. The second pressure plate 19 is connected to the second conductive element 2 by a fifth fastener 20 (such as a bolt, screw, etc.), ensuring the stability of the second pressure plate 19 during the measurement process.

[0085] The second pressure plate 19 presses one end of the second current line 501 and the second voltage line 502 onto the second conductive element 2, ensuring a stable connection between the second current line 501 and the second voltage line 502 and the second conductive element 2, reducing the possibility of loosening or disconnection. Because the connection between the current line and the voltage line and the second conductive element 2 is fixed, the stability of the current and voltage signals during measurement is ensured, thereby improving the accuracy of contact resistance measurement.

[0086] In some embodiments, the surface of the first conductive element 1 facing the first fixing frame 6 is provided with a first sink 101, and a first pressure plate 17 is provided in the first sink 101 to press one end of the first current line 401 and the first voltage line 402 onto the bottom surface of the first sink 101.

[0087] like Figure 6 As shown, the first pressure plate 17 is placed in the first sink 101, so that the first sink 101 can limit the first pressure plate 17, reducing the possibility of loosening or disconnection, and ensuring a stable connection between the first current line 401 and the first voltage line 402 and the first conductive element 1.

[0088] In some embodiments, the surface of the second conductive element 2 facing the second fixing frame 7 is provided with a second sink 201, and the second pressure plate 19 is disposed in the second sink 201 to press one end of the second current line 501 and the second voltage line onto the bottom surface of the sink 201.

[0089] like Figure 6 As shown, the second pressure plate 19 is placed in the second sink 201, so that the second sink 201 can limit the second pressure plate 19, reducing the possibility of loosening or disconnection of the connection, and ensuring a stable connection between the second current line 501 and the second voltage line 502 and the second conductive element 2.

[0090] In some embodiments, the first fixing frame 6, the first electrical insulating element 9, and the first conductive element 1 are annular frames with adapted outer peripheral contours.

[0091] It should be noted that the first fixing frame 6, the first electrical insulation component 9, and the first conductive component 1 are annular frames with matching outer contours, so that the geometry of the first fixing frame 6, the first electrical insulation component 9, and the first conductive component 1 is consistent with the housing interface under actual working conditions of the electric drive product, which further helps to improve the accuracy of the test.

[0092] In some embodiments, the second fixing frame 7, the second electrical insulating member 10, and the second conductive member 2 are annular frames with adapted outer peripheral contours.

[0093] It should be noted that the second fixing frame 7, the second electrical insulation component 10, and the second conductive component 2 are annular frames with matching outer contours, so that the geometry of the second fixing frame 7, the second electrical insulation component 10, and the second conductive component 2 is consistent with the housing interface under actual working conditions of the electric drive product, which further helps to improve the accuracy of the test.

[0094] In some embodiments, the grounding spring contact resistance measuring device 100 of this disclosure further includes a connecting plate 21 and a fixed base 22. The connecting plate 21 is connected to the first fixed frame 6, and the connecting plate 21 is provided with a connector 23 for connecting to a tensile and compressive testing machine. The fixed base 22 is connected to the second fixed frame 7.

[0095] like Figure 1 As shown, connector 23 is a screw or threaded rod used to connect the device and the tensile / compression testing machine. The fixed base 22 is connected to the second fixed frame 7, providing support and stability.

[0096] During testing, the limiting component 3 can be omitted, and the fixed base 22 is fixed below the tensile and compressive testing machine. By adjusting the height of the first conductive component 1 through the tensile and compressive testing machine, the distance between the first conductive component 1 and the second conductive component 2 can be changed, thereby controlling the compression amount of the grounding spring 200. This makes the adjustment of the compression amount of the grounding spring 200 convenient, ensures the stability of the grounding spring contact resistance measuring device 100 during the testing process, and improves operational safety.

[0097] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0098] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0099] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0100] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0101] In this utility model, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0102] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A grounding spring contact resistance measuring device, characterized in that, include: A first conductive element and a second conductive element are used to abut against the grounding spring from both sides to compress the grounding spring. A limiting member is provided between the first conductive member and the second conductive member to limit the distance between the first conductive member and the second conductive member, so as to control the compression amount of the grounding spring. A first measuring line and a second measuring line, wherein the first measuring line is connected to the first conductive element and the second measuring line is connected to the second conductive element, and the first measuring line and the second measuring line are used to measure the resistance of the grounding spring.

2. The grounding spring contact resistance measuring device according to claim 1, characterized in that, At least one of the first conductive element and the second conductive element is provided with a plurality of limiting holes of different depths that are adapted to the limiting element, so as to adjust the distance between the first conductive element and the second conductive element by changing the fit between the limiting element and different limiting holes.

3. The grounding spring contact resistance measuring device according to claim 2, characterized in that, The limiting hole is a blind hole.

4. The grounding spring contact resistance measuring device according to claim 2, characterized in that, The limiting hole is a threaded hole, and the limiting member is a threaded rod. The threaded rod cooperates with the threaded hole to adjust the distance between the first conductive member and the second conductive member by rotating the threaded rod.

5. The grounding spring contact resistance measuring device according to claim 1, characterized in that, It also includes a first fixing frame and a second fixing frame, the first conductive element is disposed on the first fixing frame, the second conductive element is disposed on the second fixing frame, and the first fixing frame and the second fixing frame are connected by a first fastener.

6. The grounding spring contact resistance measuring device according to claim 5, characterized in that, The first fixing bracket is provided with a first connecting threaded hole, the second fixing bracket is provided with a second connecting threaded hole, the first fastener is a screw, and the screw cooperates with the first connecting threaded hole and the second connecting threaded hole to connect the first fixing bracket and the second fixing bracket.

7. The grounding spring contact resistance measuring device according to claim 6, characterized in that, The limiting component is a sleeve, which is sleeved on the screw. The first end of the sleeve abuts against the first fixing frame, and the second end of the sleeve abuts against the second fixing frame, thereby limiting the distance between the first conductive component and the second conductive component.

8. The grounding spring contact resistance measuring device according to claim 7, characterized in that, The sleeve includes a plurality of sleeve rings stacked in sequence, so as to adjust the distance between the first conductive element and the second conductive element by changing the number of sleeve rings.

9. The grounding spring contact resistance measuring device according to claim 5, characterized in that, A first electrical insulating element is provided between the first fixing frame and the first conductive element; and / or A second electrical insulating element is provided between the second fixing frame and the second conductive element.

10. The grounding spring contact resistance measuring device according to claim 9, characterized in that, The first fixing frame is provided with a first limiting block, and the first electrical insulating component has a first limiting groove with an opening facing the first fixing frame, and a portion of the first limiting block is fitted into the first limiting groove; and / or The second fixing frame is provided with a second limiting block, and the second electrical insulating component has a second limiting groove with an opening facing the second fixing frame. A portion of the second limiting block is fitted into the second limiting groove.

11. The grounding spring contact resistance measuring device according to claim 10, characterized in that, The first electrical insulating member has a third limiting groove with an opening facing the first conductive member, and at least a portion of the first conductive member fits within the third limiting groove; and / or The second electrical insulating member has a fourth limiting groove with an opening facing the second conductive member, and at least a portion of the second conductive member is fitted into the fourth limiting groove.

12. The grounding spring contact resistance measuring device according to claim 11, characterized in that, It also includes a first pressing block and a second fastener, the first pressing block being connected to the first conductive element via the second fastener, the first pressing block being pressed onto the first limiting block in a direction toward the first conductive element, and a first electrical insulating sheet being provided between the first pressing block and the first limiting block; and / or The grounding spring contact resistance measuring device further includes a second pressure block and a third fastener. The second pressure block is connected to the second conductive element through the third fastener. The second pressure block is pressed onto the second limiting block in the direction toward the second conductive element. A second electrical insulating sheet is provided between the second pressure block and the second limiting block.

13. The grounding spring contact resistance measuring device according to claim 12, characterized in that, The first pressure block has a first groove (1001) with an opening facing the first limiting block, and a portion of the first limiting block fits into the first groove (1001); and / or The second pressure block has a second groove with an opening facing the second limiting block, and a portion of the second limiting block fits into the second groove.

14. The grounding spring contact resistance measuring device according to claim 13, characterized in that, The first electrical insulating component has a first through hole that mates with the second fastener; and / or The second electrical insulating component is provided with a second through hole that mates with the third fastener.

15. The grounding spring contact resistance measuring device according to claim 5, characterized in that, The first measuring line includes a first current line and a first voltage line, and the second measuring line includes a second current line and a second voltage line. The first voltage line and the second voltage line are used to measure the potential difference between the first conductive element and the second conductive element, and the first current line and the second current line are used to measure the current difference between the first conductive element and the second conductive element.

16. The grounding spring contact resistance measuring device according to claim 15, characterized in that, It also includes a first pressure plate and a fourth fastener, the first pressure plate being connected to the first conductive element via the four fasteners, the first pressure plate pressing one end of the first current line and the first voltage line onto the first conductive element; and / or The grounding spring contact resistance measuring device further includes a second pressure plate and a fifth fastener. The second pressure plate is connected to the second conductive element through the fifth fastener. The second pressure plate presses one end of the second current line and the second voltage line onto the second conductive element.

17. The grounding spring contact resistance measuring device according to claim 16, characterized in that, The surface of the first conductive element facing the first fixing frame has a first recess, and the first pressure plate is disposed in the first recess to press one end of the first current line and the first voltage line onto the bottom surface of the first recess; and / or The second conductive element has a second groove on its surface facing the second fixing frame, and the second pressure plate is disposed in the second groove to press one end of the second current line and the second voltage line onto the bottom surface of the second groove.

18. The grounding spring contact resistance measuring device according to claim 9, characterized in that, The first fixing frame, the first electrical insulating component, and the first conductive component are annular frames with adapted outer peripheral contours; and / or The second fixing frame, the second electrical insulating component, and the second conductive component are annular frames with adapted outer peripheral contours.

19. The grounding spring contact resistance measuring device according to claim 9, characterized in that, It also includes a connecting plate and a fixed base. The connecting plate is connected to the first fixed frame and is provided with a connector for connecting to a tensile and compressive testing machine. The fixed base is connected to the second fixed frame.

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