A resistance value testing fixture

Abstract

This utility model provides a resistance value testing fixture, which includes: a base plate, a resistance adjustment seat, a movable plate, and a resistance testing assembly. The base plate has multiple support feet, and the resistance adjustment seat is mounted on the base plate with an operation window on its side. The resistance testing assembly includes a central shaft, a probe mounted on the central shaft, an unlocking ring, two limit buckles, and multiple metal plates. The central shaft is mounted on the movable plate and has multiple vertical surfaces. The metal plates are located on the vertical surfaces. A groove is formed on the central shaft, and a clamping spring is installed within the groove. The clamping spring drives the two limit buckles to move closer together. A push rod is provided on the unlocking ring, and an inclined surface is provided on the limit buckles. This resistance value testing fixture can quickly clamp semi-finished resistors with a double-layer structure, provides positioning to ensure testing of target points, and provides sufficient space for resistance adjustment operations, reducing product clamping and disassembly time, ensuring adjustment accuracy while improving adjustment efficiency.

Description

Technical Field

[0001] This utility model relates to the field of resistance processing, and in particular to a resistance value testing fixture. Background Technology

[0002] Figure 1 This is a schematic diagram of the structure of the shunt resistor semi-finished product 20. The resistor semi-finished product 20 includes a bracket 21, a resistor body 22, and multiple pins 23. The resistor body 22 is fixed on the bracket 21 to form a double-layer structure. The pins 23 are connected to the resistor body 22, and the ends of the pins 23 penetrate the resistor body 22. The pins 23 and the resistor body 22 are welded together. In subsequent processes, the resistor semi-finished product 20 needs to be installed into a housing (not shown) to form a coaxial shunt. Since the resistor body 22 is enclosed after installation and cannot be adjusted, the resistance value of the resistor body 22 needs to be tested and adjusted before installation to ensure that the resistance value of the semi-finished product 20 meets the standards.

[0003] Furthermore, since the aforementioned resistor semi-finished product 20 has a double-layer structure, there is a problem of difficulty in clamping it. Also, since the cross-sections of the bracket 21 and the resistor body 22 are both circular, there is a lack of directional positioning, making it difficult to determine the test point. This can easily lead to inaccurate measured resistance values, resulting in the resistance value not meeting the standard after adjustment. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a resistance value testing fixture that can quickly clamp semi-finished resistors with a double-layer structure, provide positioning to ensure testing of target points, and provide sufficient space for resistance adjustment operations, thereby reducing the time for product clamping and disassembly, ensuring resistance adjustment accuracy, and improving resistance adjustment efficiency.

[0005] The objective of this utility model is achieved through the following technical solution: A resistance value testing fixture for clamping a semi-finished resistor to be adjusted, comprising: a base plate, an adjustment base, a movable plate, and a resistance testing assembly. The base plate is provided with multiple support feet, the adjustable base is provided on the base plate, the adjustable base is a hollow tubular structure, and an operation window is provided on the side of the adjustable base. The movable plate is movably located below the base plate; The resistance testing assembly includes a central shaft and probes, an unlocking ring, two limiting buckles, and multiple metal patches mounted on the central shaft. The central shaft is mounted on the movable plate and has multiple vertical surfaces. The metal patches are located on the vertical surfaces and are used to contact the pins on the resistor semi-finished product. A groove is formed on the central shaft, and the limiting buckles are located in the groove. A clamping spring is provided in the groove to drive the two limiting buckles to move closer together. A push rod is provided on the unlocking ring, and an inclined surface matching the push rod is provided on the limiting buckles. The push rod is used to drive the two limiting buckles to move away from each other.

[0006] In one embodiment, the end of the adjustable seat is provided with a positioning step.

[0007] In one embodiment, the operation window is provided in a plurality of such windows, which are arranged in a circular array around the axis of the adjustment seat.

[0008] In one embodiment, the support leg passes through the movable plate, and a linear bearing is provided on the movable plate at the position where it contacts the support leg.

[0009] In one embodiment, a through hole is provided on the central shaft, the probe is located in the through hole, and a return spring is provided in the through hole for pushing the probe.

[0010] In one embodiment, the facade is perpendicular to the end face of the central axis.

[0011] In one embodiment, the length of the metal patch is greater than the diameter of the pins on the resistor semi-finished product.

[0012] In one embodiment, the push rod has a dome at one end near the inclined surface.

[0013] In one embodiment, the outer wall of the central shaft is provided with an anti-detachment protrusion that extends into the operating window.

[0014] In one embodiment, the two limiting buckles are arranged facing each other.

[0015] The resistance value testing fixture can quickly clamp semi-finished resistors with a double-layer structure, provide positioning to ensure testing of target points, and provide sufficient space for resistance adjustment operations, reducing product clamping and disassembly time, ensuring resistance adjustment accuracy while improving resistance adjustment efficiency. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of a semi-finished resistor. Figure 2 This is a schematic diagram of the resistance testing fixture. Figure 3 This is a schematic diagram showing the fit between the adjusting seat and the central shaft; Figure 4 This is a schematic diagram of the adjustable resistor base; Figure 5 This is a schematic diagram of the internal structure of the resistance testing fixture when no product is clamped. Figure 6 This is a schematic diagram of the internal structure of the resistance testing fixture after the product is clamped.

[0018] Reference numerals: 10, Resistance testing fixture; 100, Base plate; 110, Support foot; 200, Adjustment seat; 210, Operation window; 220, Positioning step; 300, Movable plate; 310, Linear bearing; 400, Resistance testing assembly; 410, Central shaft; 411, Elevation; 412, Slide groove; 413, Clamping spring; 414, Through hole; 415, Anti-detachment protrusion; 416, Reset spring; 420, Probe; 430, Unlocking ring; 431, Push rod; 440, Limit buckle; 441, Inclined surface; 450, Metal patch. Detailed Implementation

[0019] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of this utility model. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0020] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0022] Please see Figure 2 and Figure 5 This utility model provides a resistance value testing fixture 10 for clamping a semi-finished resistor 20 to be adjusted. It includes a base plate 100, an adjustment seat 200, a movable plate 300, and a resistance testing assembly 400. During testing, the adjustment seat 200 positions the semi-finished resistor 20, and the resistance testing assembly 400 measures the resistance value of the semi-finished resistor 20. The resistance of the semi-finished resistor 20 is adjusted based on the measured actual resistance value to ensure it meets the standard. Specifically, the adjustment involves slotting the resistor body 22, reducing the material of the resistor body 22 to decrease the resistance value. Therefore, the resistance testing assembly 400 needs to measure the actual resistance value of the semi-finished resistor 20 during the adjustment process.

[0023] Please see Figure 2 and Figure 4 The base plate 100 is provided with multiple support feet 110, and the adjustable seat 200 is provided on the base plate 100. The adjustable seat 200 is a hollow tubular structure, and an operation window 210 is provided on the side of the adjustable seat 200.

[0024] Please see Figure 3 In this application, the resistance to be measured has a double-layer structure, such as... Figure 1 As shown, after the resistor semi-finished product 20 is placed into the resistor adjustment seat 200, the bracket 21 on the resistor semi-finished product 20 is limited by the resistor adjustment seat 200, and the resistor body 22 is inserted into the inner cavity of the resistor adjustment seat 200. At this time, the resistor body 22 is adjusted through the operation window 210 on the side of the resistor adjustment seat 200.

[0025] The movable plate 300 is movably located below the base plate 100; Please see Figure 3 and Figure 5The resistance testing assembly 400 includes a central shaft 410 and a probe 420, an unlocking ring 430, two limit buckles 440, and multiple metal patches 450 disposed on the central shaft 410. The central shaft 410 is disposed on a movable plate 300 and has multiple vertical surfaces 411. The metal patches 450 are located on the vertical surfaces 411 and are used to contact the pins on the resistor semi-finished product. The central shaft 410 has a sliding groove 412, and the limit buckles 440 are located in the sliding groove 412. The sliding groove 412 has a clamping spring 413, which is used to drive the two limit buckles 440 to move closer together. The unlocking ring 430 has a push rod 431, and the limit buckles 440 have an inclined surface 441 that matches the push rod 431. The push rod 431 is used to drive the two limit buckles 440 to move away from each other.

[0026] The process of clamping the resistor semi-finished product 20 in the resistance value testing fixture 10 during the resistance adjustment process is as follows: Place the semi-finished resistor 20 on the adjusting base 200, so that the bracket 21 extends into the adjusting base 200. At this time, the resistor 22 is sent into the inner cavity of the adjusting base 200. The position of the resistor 22 can be observed through the operation window 210. Press down on the bracket 21 and push the movable plate 300 to bring it close to the base plate 100 until the top of the central shaft 410 contacts the resistor 22, so that the probe 420 contacts the center of the resistor 22. During this process, the limit buckles 440 are squeezed away from each other by the resistor 22, and after the barb on the limit buckle 440 passes the resistor 22, the limit buckle 440 is reset under the action of the clamping spring 413, thereby locking the resistor 22.

[0027] After the external force is removed, the movable plate 300 tends to slide downwards, and the limit buckle 440 holds the resistor 22 in place. The weight of the movable plate 300 and the accessories mounted on it then acts on the resistor 22, using the weight of the accessories themselves to fix the semi-finished resistor 20 onto the adjusting base 200. Figure 6 As shown.

[0028] Next, rotate the central shaft 410 so that the metal patch 450 contacts the pins 23 on the resistor semi-finished product 20, thus completing the clamping action. Applying current allows for testing the resistance value of the resistor semi-finished product 20. A grinder can be inserted into the operating window 210 to grind the resistor body 22, adjusting the resistance value to the target value.

[0029] After the resistance adjustment operation is completed, simply press the unlocking ring 430 and push the limit buckle 440 through the push rod 431 to move the two limit buckles 440 away from each other, thereby releasing the lock on the resistor body 22 and taking out the resistor semi-finished product 20 after resistance adjustment.

[0030] The aforementioned resistance value testing fixture 10 can quickly clamp the semi-finished resistor 20 with a double-layer structure, provide positioning to ensure testing of the target point, and provide sufficient space for resistance adjustment operations, reducing the time for product clamping and disassembly, ensuring resistance adjustment accuracy, and improving resistance adjustment efficiency.

[0031] Please see Figure 4 In one embodiment, the end of the adjusting base 200 is provided with a positioning step 220. The positioning step 220 abuts against the resistor semi-finished product 20 to provide a limiting position.

[0032] Please see Figure 4 In one embodiment, multiple operation windows 210 are provided, and the multiple operation windows 210 are arranged in a circular array around the axis of the adjusting base 200. This provides more operating space to facilitate the adjustment of the resistor 22 located in the cavity of the adjusting base 200.

[0033] Please see Figure 2 In one embodiment, a movable plate 300 passes through the support foot 110, and a linear bearing 310 is provided on the movable plate 300 at the position where it contacts the support foot 110. This makes the movable plate 300 slide more smoothly.

[0034] Please see Figure 5 In one embodiment, a through hole 414 is provided on the central shaft 410, and the probe 420 is located in the through hole 414. A reset spring 416 is provided in the through hole 414. The reset spring 416 is used to push the probe 420 and return the probe 420 to its original position after the resistor semi-finished product 20 is removed.

[0035] In one embodiment, the length of the metal patch 450 is greater than the diameter of the pin 23 on the resistor semi-finished product 20. By increasing the coverage area of ​​the metal patch 450, the metal patch 450 can still contact the pin 23 when the position of the pin 23 on the resistor semi-finished product 20 changes or when the resistance of resistor semi-finished products 20 of different specifications is adjusted.

[0036] Please see Figure 3 In one embodiment, the outer wall of the central shaft 410 is provided with an anti-detachment protrusion 415, which extends into the operating window 210. When the movable plate 300 slides down, the anti-detachment protrusion 415 can be hooked on the operating window 210, keeping the central shaft 410 within the adjusting seat 200, preventing the central shaft 410 from completely detaching from the adjusting seat 200, and maintaining the structural stability of the fixture.

[0037] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A resistance value testing fixture for clamping a resistance semi-product to be adjusted, characterized in that, include: Base plate, resistance adjustment base, movable plate and resistance testing assembly; The base plate is provided with multiple support feet, the adjustable base is provided on the base plate, the adjustable base is a hollow tubular structure, and an operation window is provided on the side of the adjustable base. The movable plate is movably located below the base plate; The resistance testing assembly includes a central shaft and probes, an unlocking ring, two limiting buckles, and multiple metal patches mounted on the central shaft. The central shaft is mounted on the movable plate and has multiple vertical surfaces. The metal patches are located on the vertical surfaces and are used to contact the pins on the resistor semi-finished product. A groove is formed on the central shaft, and the limiting buckles are located in the groove. A clamping spring is provided in the groove to drive the two limiting buckles to move closer together. A push rod is provided on the unlocking ring, and an inclined surface matching the push rod is provided on the limiting buckles. The push rod is used to drive the two limiting buckles to move away from each other.

2. The resistance value test fixture of claim 1, wherein, The end of the resistance adjustment seat is provided with a positioning step.

3. The resistance value test fixture of claim 1, wherein, The operation window is provided in multiple ways, and the multiple operation windows are arranged in a circular array with the axis of the adjustment seat as the center.

4. The resistance value test fixture of claim 1, wherein, The support leg passes through the movable plate, and a linear bearing is provided on the movable plate at the position where it contacts the support leg.

5. The resistance testing fixture according to claim 1, characterized in that, A through hole is provided on the central shaft, the probe is located in the through hole, and a return spring is provided in the through hole for pushing the probe.

6. The resistance value test fixture of claim 1, wherein, The facade is perpendicular to the end face of the central axis.

7. The resistance value testing fixture of claim 1, wherein, The length of the metal patch is greater than the diameter of the pins on the resistor semi-finished product.

8. The resistance value test fixture of claim 1, wherein, The push rod has a dome at one end near the inclined surface.

9. The resistance value test fixture of claim 1, wherein, The outer wall of the central shaft is provided with an anti-detachment protrusion, which extends into the operating window.

10. The resistance value testing fixture of claim 1, wherein, The two limit buckles are arranged facing each other.

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