Plunger rod resistance test equipment

Abstract

The utility model discloses a plunger rod resistance test device, which can be used for regularly calibrating the inherent resistance value in a system through the arrangement of a calibration plate, thereby ensuring the reliability of a test result and ensuring the subsequent measurement precision. Through the arrangement of the clamping assembly of the tool plunger rod fixing mechanism, the tool plunger rod can be loosened in the testing stage and clamped in the actual testing stage, and the flexibility is improved. The pressure adjusting assembly is integrated on the plunger rod fixing mechanism, so that the pressure applied to the tested plunger rod can be accurately controlled, the contact strength between the tool plunger rod and the tested plunger rod is ensured, and diversified test requirements in different scenes can be met.

Description

Technical Field

[0001] The utility model relates to the technical field of testing, in particular to a plunger rod resistance testing device. Background Art

[0002] A plunger rod, a metal rod with a diameter less than 1.5mm, is widely used in the medical electronics industry. Made of phosphor bronze or other materials, it's primarily used for electrical transmission. As a crucial component in the medical electronics industry, the plunger rod's performance stability directly impacts the overall circuit's operation. Therefore, testing plunger rod resistor prototypes is crucial.

[0003] Currently, there are some prototype testing equipment for plunger resistance on the market, but they often have the following problems:

[0004] 1. Low accuracy: Traditional plunger rod resistance test equipment usually uses manual measurement. During the operation, it is impossible to eliminate the resistance error inside the test instrument circuit, resulting in inaccurate test results.

[0005] 2. Slow efficiency: Traditional plunger rod resistance testing equipment is complicated to operate and requires multiple adjustments and tests, which consumes a lot of time and manpower.

[0006] 3. Single function: Existing plunger rod resistance test equipment can often only perform a single resistance value measurement and cannot meet various testing needs.

[0007] Therefore, how to overcome the above-mentioned defects has become an important issue to be solved urgently by those skilled in the art. Utility Model Content

[0008] The utility model overcomes the deficiencies of the above-mentioned technologies and provides a plunger rod resistance testing device.

[0009] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0010] A plunger rod resistance testing device includes: a chassis 100, a calibration plate 200, and a tool plunger rod 300. The chassis 100 is provided with a plunger rod fixing mechanism 1 for fixing the plunger rod to be tested, and a tool plunger rod fixing mechanism 2 for applying pressure to the plunger rod to be tested; wherein the tool plunger rod fixing mechanism 2 includes: a clamping assembly 21 for clamping or loosening the two ends of the tool plunger rod 300, and a pressure regulating assembly 22 installed on the clamping assembly, wherein the pressure regulating assembly 22 is used to drive the tool plunger rod on the clamping assembly to press down or away from the plunger rod to be tested to adjust the applied pressure.

[0011] Preferably, the clamping assembly 21 includes: a first supporting plate 211, a first elastic clamp 212 installed laterally on the top of the first supporting plate 211 for clamping or releasing the tool plunger rod, the first elastic clamp 212 is provided with a protruding connecting portion 2120 extending laterally to the left from the end of one clamping portion and protruding from the other clamping portion, the protruding connecting portion 2120 is recessed with a notch 213 at its bottom for embedding into the top of the first supporting plate 211 and is hinged to the top of the first supporting plate 211 by a longitudinal screw 214, and the protruding connecting portion 2120 is inserted with a first locking pin 215 at its top; a first test contact 2111 for conductively connecting to one end of the tool plunger rod or the calibration plate 200 is provided inside one clamping portion of the first elastic clamp 212, and a second test contact 2112 for conductively connecting to the other end of the tool plunger rod / calibration plate 200 and symmetrically arranged with the first test contact 2111 is provided inside the other clamping portion.

[0012] Preferably, the pressure adjustment assembly 22 includes: a first adjusting screw 221 inserted into the left end face of the raised connecting portion 2120, a force adjustment nut 222 for adjusting the depth of the first adjusting screw 221 screwed into the raised connecting portion 2120, and a second locking pin 223 for locking the first adjusting screw 221. The first elastic clamp 212 has one or more weights 224 placed inside its clamping portion with the raised connecting portion 2120.

[0013] Preferably, the plunger rod fixing mechanism 1 to be tested includes: a second elastic clamp 11 installed longitudinally, a push-pull assembly 12 for driving the second elastic clamp 11 to move longitudinally, a third test contact 111 for conductively connecting to one end of the plunger rod to be tested / calibration plate 200 is provided inside one clamping part of the second elastic clamp 11, and a fourth test contact 112 for conductively connecting to the other end of the plunger rod to be tested / calibration plate 200 is provided inside the other clamping part; the second elastic clamp 11 is equipped with a pressure sensor 13 on one clamping part thereof for detecting the pressure from the tool plunger rod fixing mechanism 2.

[0014] Preferably, the push-pull assembly 12 includes: a base 121 arranged on the chassis 100, a double linear guide rail 122 longitudinally installed on the base 121, a bottom plate 123 that moves longitudinally along the double linear guide rail 122, a push-pull handle 124 connected to one side of the bottom plate 123 for manual pushing and pulling of the bottom plate 123, and a third locking pin 125 for locking the bottom plate 123 when adjusted into place, and the second elastic clamp 11 is installed on the bottom plate 123.

[0015] Preferably, the tool plunger rod fixing mechanism 2 also includes: a first drive assembly 23 for driving the clamping assembly to move laterally, the first drive assembly 23 including: a servo motor 231, a coupling 232 connected to the rotor of the servo motor 231, a screw 233 with an external thread installed on the coupling 232, a connecting block 234 with an internal thread that cooperates with the screw 233 in a spiral transmission and can move laterally, and a horizontal slide 235 installed on the connecting block 234; the first supporting plate 211 stands vertically above the horizontal slide 235.

[0016] Preferably, the transverse slide 235 is provided with a fine-tuning screw 236 on one side / both sides thereof for performing transverse fine-tuning.

[0017] Preferably, the chassis 100 includes a bottom shell 101 and a top plate 102 hinged to one end of the bottom shell 101 and capable of flipping over. The top plate 102 is fixedly mounted on the top surface of the bottom shell 101 by a tower buckle 103. The bottom shell 101 is provided with four multimeter connection ports 104, a cooling fan 105, a network interface 106, and a power interface 107 on the rear side; the bottom shell 101 is provided with a start button 108 and an emergency stop button 109 on its front side; the bottom shell 101 is provided with handles 110 on its left and right sides.

[0018] Preferably, the chassis 100 is an aluminum alloy box.

[0019] Preferably, the first test contact 2111 , the second test contact 2112 , the third test contact 111 , and the fourth test contact 112 are gold-plated contacts.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] 1. This solution, through the provision of a calibration board, can be used to regularly calibrate the inherent resistance within the system, ensuring the reliability of test results and the accuracy of subsequent measurements. By providing the clamping assembly of the tool plunger rod fixing mechanism, the tool plunger rod can be loosened during the test phase and clamped during the actual test phase, improving flexibility. By integrating a pressure regulating assembly into the plunger rod fixing mechanism, the pressure applied to the plunger rod under test can be precisely controlled to ensure the contact force between the tool plunger rod and the plunger rod under test, thereby meeting the diverse testing needs in different scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the three-dimensional structure of the plunger rod resistance testing equipment in this case viewed from the back to the front.

[0023] Figure 2 This is a top view of the plunger rod resistance testing equipment in this case.

[0024] Figure 3This is a structural diagram of the case without the chassis.

[0025] Figure 4 This is a perspective view of the tool plunger rod fixing mechanism in this case with the first drive component hidden.

[0026] Figure 5 It is a structural diagram of the plunger rod fixing mechanism under test in this case. DETAILED DESCRIPTION

[0027] The following examples further illustrate the features of the present invention and other related features to facilitate understanding by those skilled in the art:

[0028] Figures 1 to 5 As shown, a plunger rod resistance testing device is characterized by comprising: a chassis 100, a calibration plate 200, and a tool plunger rod 300. The chassis 100 is provided with a plunger rod fixing mechanism 1 for fixing the plunger rod under test, and a tool plunger rod fixing mechanism 2 for applying pressure to the plunger rod under test. The tool plunger rod fixing mechanism 2 includes a clamping assembly 21 for clamping or releasing the two ends of the tool plunger rod 300, and a pressure regulating assembly 22 mounted on the clamping assembly. The pressure regulating assembly 22 is used to drive the tool plunger rod on the clamping assembly to press down or away from the plunger rod under test to adjust the applied pressure. In specific implementation, the calibration plate 200 is provided with four test connection terminals located at the front, back, left, and right sides. During actual testing, the test is divided into a calibration phase and an actual testing phase. The calibration phase first calibrates the resistance value by conductively connecting the four test connection terminals of the calibration plate 200. The actual testing phase conducts actual testing by conductively connecting the two ends of the tool plunger rod 300 and the two ends of the plunger rod under test 400.

[0029] As described above, this solution, through the provision of the calibration plate 200, can be used to regularly calibrate the inherent resistance value within the system, thereby ensuring the reliability of the test results and the accuracy of subsequent measurements. By providing the clamping assembly of the tool plunger rod fixing mechanism 2, the tool plunger rod can be loosened during the test phase and clamped during the actual test phase, thereby improving flexibility. By integrating the pressure regulating assembly 22 into the plunger rod fixing mechanism 2, the pressure applied to the plunger rod under test can be precisely controlled to ensure the contact force between the tool plunger rod and the plunger rod under test, thereby meeting the diverse testing needs in different scenarios.

[0030] like Figure 3 and Figure 4As shown, in a specific implementation, the clamping assembly 21 includes: a first supporting plate 211, a first elastic clamp 212 installed laterally on the top of the first supporting plate 211 for clamping or releasing the tool plunger rod, the first elastic clamp 212 is provided with a protruding connecting portion 2120 extending laterally to the left from the end of one clamping portion and protruding from the other clamping portion, the protruding connecting portion 2120 is recessed with a notch 213 at its bottom for embedding into the top of the first supporting plate 211 and is hinged to the top of the first supporting plate 211 by a longitudinal screw 214, and the protruding connecting portion 2120 is inserted with a first locking pin 215 at its top; a first test contact 2111 for conductively connecting to one end of the tool plunger rod or the calibration plate 200 is provided inside one clamping portion of the first elastic clamp 212, and a second test contact 2112 for conductively connecting to the other end of the tool plunger rod / calibration plate 200 and symmetrically arranged with the first test contact 2111 is provided inside the other clamping portion. During the actual testing phase, the tool plunger rod is clamped between the first test contact 2111 and the second test contact 2112 to achieve a conductive connection between the two ends of the tool plunger rod, forming a closed loop. During the calibration phase, the first test contact 2111 and the second test contact 2112 are conductively connected to the test connection terminals at the front and rear ends of the calibration board, respectively, forming a closed loop.

[0031] As described above, by firmly clamping the first elastic clamp 212, the first test contact and the second test contact are in close contact with the tool plunger rod or calibration plate, which can effectively reduce the measurement error caused by poor contact and improve the accuracy of the measurement results. In addition, the elastic clamp can apply force evenly during the clamping process to avoid damage to the test piece such as the tool plunger rod / calibration plate. The raised connection portion 2120 and the top of the first support plate 211 are hinged through the slot 213 and the longitudinal screw 214, which ensures the stability of the clamping assembly during operation, reduces loosening or deviation caused by vibration or external force, and thus ensures the accuracy of the test. The insertion of the first locking pin 215 further enhances the stability of the clamping, prevents the clamp from accidentally opening during the test, and ensures the continuity and reliability of the test.

[0032] like Figure 4As shown, the pressure adjustment assembly 22 includes: a first adjusting screw 221 inserted into the left end face of the raised connecting portion 2120, a force adjustment nut 222 for adjusting the depth of the first adjusting screw 221 screwed into the raised connecting portion 2120, and a second locking pin 223 for locking the first adjusting screw 221. The first elastic clamp 212 has one or more weights 224 placed inside its clamping portion with the raised connecting portion 2120. During specific implementation, the first supporting plate 211, the first elastic clamp 212, the first adjusting screw 221 and the force adjusting nut 222 form a lever structure; the force adjusting nut 228 adjusts the length of the force arm by adjusting the depth of the first adjusting screw 221 screwed into the raised connecting portion 2120, so that the first elastic clamp 212 swings around the longitudinal screw 214; when the force arm is shortened, the balance of the first elastic clamp 212 is broken, and a lever movement occurs, causing the first elastic clamp 212 to swing downward, driving the weight to slide, so that the tool plunger rod is pressed against the plunger rod to be measured, so as to adjust the applied pressure.

[0033] As mentioned above, the pressure regulating assembly 22 in this case changes the length of the force arm by adjusting the force adjusting nut, which can achieve precise adjustment of the pressure applied to the plunger rod under test to meet the needs of different pressure scenarios; and the user only needs to rotate the force adjusting nut to complete the pressure adjustment, which improves the convenience and efficiency of operation. The first supporting plate 211 and a part of the clamping part of the first elastic clamp form a lever structure to facilitate the stable and reliable pressure regulation process. The design of the second locking pin 223 ensures the stability of the adjusting screw during the adjustment process, prevents pressure fluctuations caused by loosening or falling off, and further ensures the test accuracy. The precise pressure control and stable operating performance of the entire pressure regulating assembly 22 help reduce errors and uncertainties in the test process, improve the accuracy and reliability of the test, help shorten the test cycle, and improve test efficiency.

[0034] like Figure 3 and Figure 5As shown, the plunger rod fixing mechanism 1 under test includes: a longitudinally mounted second elastic clamp 11; a push-pull assembly 12 that drives the longitudinal movement of the second elastic clamp 11; a third test contact 111 embedded within one clamping portion of the second elastic clamp 11 for electrically connecting to one end of the plunger rod under test / calibration plate 200; and a fourth test contact 112 embedded within the other clamping portion for electrically connecting to the other end of the plunger rod under test / calibration plate 200; and a pressure sensor 13 mounted on one clamping portion of the second elastic clamp 11 for detecting pressure from the tool plunger rod fixing mechanism 2. Specifically, the pressure sensor 13 is a highly sensitive force sensor that can accurately capture minute force changes, thereby achieving precise control of the plunger rod contact force and, therefore, precise measurement of the resistance value. During the actual testing phase, the plunger rod under test is clamped between the third test contact 111 and the fourth test contact 112 to achieve a conductive connection between the two ends of the plunger rod under test, forming a closed circuit. During the calibration phase, the third test contact 111 and the fourth test contact 112 are conductively connected to the test connection terminals at the left and right ends of the calibration board, respectively, to form a closed loop.

[0035] As mentioned above, the second elastic clamp 11 adopts an elastic design, which can firmly clamp the plunger rod to be tested to prevent it from moving or loosening during the test, so as to ensure the accuracy and reliability of the test. The setting of the push-pull component 12 facilitates the zero-fire drive of the second elastic clamp 11 to move longitudinally. By pulling out the second elastic clamp 11, it is convenient to replace the plunger rod to be tested, which is easy to use. The third test contact 111 and the fourth test contact 112 are respectively embedded in the two clamping parts of the second elastic clamp 11 to ensure a reliable conductive connection with both ends of the plunger rod to be tested. The pressure sensor 13 is installed in the setting of the second elastic clamp 11 to detect the pressure from the tool plunger rod fixing mechanism 2, so that the operator can adjust the sensitivity of the force sensor as needed to obtain a more accurate resistance value.

[0036] like Figure 5As shown, in a specific implementation, the push-pull assembly 12 includes: a base 121 disposed on the chassis 100, a dual linear guide rail 122 longitudinally mounted on the base 121, a base plate 123 that moves longitudinally along the dual linear guide rail 122, a push-pull handle 124 connected to one side of the base plate 123 for manual pushing and pulling of the base plate 123, and a third locking pin 125 for locking the base plate 123 when adjusted into position. The second elastic clamp 11 is mounted on the base plate 123. In this way, the dual linear guide rail 122 provides a stable motion track for the base plate 123, ensuring the stability and accuracy of the base plate during movement. The provision of the third locking pin 125 can firmly lock the base plate 123 after adjustment, preventing it from moving or shaking during testing, thereby improving the stability and reliability of the test. By setting the push-pull handle 124, the operator can accurately adjust the second elastic clamp 11 to the required position to ensure replacement with the plunger rod to be tested and precise adjustment to the position where the tool plunger rod can be pressed down, which is easy to operate and can improve test efficiency.

[0037] like Figure 3 As shown, the tool plunger rod fixing mechanism 2 also includes: a first drive assembly 23 for driving the lateral movement of the clamping assembly, the first drive assembly 23 including: a servo motor 231, a coupling 232 connected to the rotor of the servo motor 231, a screw 233 with an external thread mounted on the coupling 232, a connecting block 234 with an internal thread that can move laterally in conjunction with the screw 233 in a spiral transmission, and a transverse slide 235 mounted on the connecting block 234; the first support plate 211 stands vertically above the transverse slide 235. In a specific implementation, the first drive assembly is a slide module. In this way, the first drive assembly in the plunger rod fixing mechanism of this case realizes the precise lateral movement of the clamping assembly through the precise coordination of the servo motor, coupling, screw, connecting block and transverse slide, which not only improves work efficiency and automation, but also ensures the accuracy and quality of product processing.

[0038] like Figure 3 As shown, the transverse slide 235 is mounted with a fine adjustment screw 236 on one or both sides thereof for lateral fine adjustment. Thus, the fine adjustment screw 236 allows for fine adjustment of the transverse slide 235, so that the operator can further precisely adjust the position of the slide by rotating and adjusting the fine adjustment screw 236, which can significantly improve the positioning accuracy of the clamping assembly and ensure the accuracy and reliability of the plunger rod fixation.

[0039] like Figure 1 and Figure 2As shown, the chassis 100 includes a bottom shell 101 and a top plate 102 hinged to one end of the bottom shell 101 for rotation. The top plate 102 is fixed to the top surface of the bottom shell 101 via a tab 103. The bottom shell 101 is provided with four multimeter connection ports 104, a cooling fan 105, a network interface 106, and a power interface 107 on its rear side. The bottom shell 101 is provided with a start button 108 and an emergency stop button 109 on its front side. The bottom shell 101 is provided with handles 110 on its left and right sides. In a specific implementation, the calibration plate 200 is electrically connected to the four multimeter connection ports 104 via wires during the calibration phase. The first test contact 2111, the second test contact 2112, the third test contact 111, and the fourth test contact 112 are electrically connected to the four multimeter connection ports 104 via wires during the testing phase. In this way, during the calibration phase, the calibration board 200 is directly conductively connected to the four multimeter connection ports 104 via wires, thereby ensuring the accuracy of signal transmission.

[0040] As described above, the top panel 102 of the chassis 100 is hingedly connected to the bottom housing 101 and secured with tabs 103, making opening and closing the chassis extremely convenient, eliminating the need for complex disassembly. This allows users to easily open the top panel and perform maintenance, upgrades, or inspections on the inside of the chassis, greatly improving operational flexibility. The handles 110 installed on the left and right sides make the chassis easy to carry and move, enhancing the device's portability and making it particularly suitable for scenarios requiring frequent movement or transfers between different workplaces. The cooling fans 105 installed on the rear side of the bottom housing 101 effectively reduce the internal temperature of the chassis, ensuring stable operation of the internal electronic components and extending the device's service life. The four multimeter connection ports 104 enable the chassis to be directly connected to a multimeter, facilitating accurate measurement and monitoring of specific resistance values. The provision of a network interface 106 and a power interface 107 ensures that the chassis can easily access the network and obtain power, supporting remote control and monitoring, and enhancing the device's connectivity and intelligence. The start button 108 and the emergency stop button 109 provided on the front side make the start and emergency stop operations of the device more intuitive and convenient, and improve the safety of the device. The above-mentioned various components and ports are arranged to make full use of the space of the entire chassis, making the structure more compact.

[0041] As a preferred embodiment, the chassis 100 is constructed of an aluminum alloy. Aluminum alloy possesses high strength and hardness, effectively resisting external shock and vibration, ensuring the overall stability and service life of the test equipment in complex operating environments. Furthermore, aluminum alloy has high thermal conductivity, rapidly dissipating heat generated within the device to the external environment, maintaining a stable internal temperature and preventing high temperatures from affecting test accuracy or damaging internal components.

[0042] As a preferred embodiment, the first test contact 2111, the second test contact 2112, the third test contact 111, and the fourth test contact 112 are gold-plated contoured contacts whose shape matches the end face of the plunger rod. This gold-plated contact has a high hardness, can withstand frequent insertion and removal, and wear, and maintain long-term stable contact performance. This contoured design can better adapt to the shape and size of the test object, ensure close contact between the contacts and the test object, and improve the reliability and accuracy of the test.

[0043] As mentioned above, this case protects a plunger rod resistance testing device, and all technical solutions that are the same or similar to this case should be deemed to fall within the scope of protection of this case.

Claims

1. A plunger rod resistance testing device, characterized in that: include: A case (100), a calibration plate (200) and a tool plunger rod (300) are provided on the case (100). A measured plunger rod fixing mechanism (1) for fixing the measured plunger rod and a tool plunger rod fixing mechanism (2) for applying pressure to the measured plunger rod are provided. The tool plunger rod fixing mechanism (2) comprises: a clamping assembly (21) for clamping or releasing the two ends of the tool plunger rod (300), and a pressure regulating assembly (22) mounted on the clamping assembly. The pressure regulating assembly (22) is used to drive the tool plunger rod on the clamping assembly to press down or away from the measured plunger rod to adjust the applied pressure.

2. The plunger rod resistance testing device according to claim 1, characterized in that: The clamping assembly (21) comprises: a first supporting plate (211), a first elastic clamp (212) installed transversely on the top of the first supporting plate (211) for clamping or releasing the tool plunger rod, the first elastic clamp (212) is provided with a protruding connecting portion (2120) extending transversely to the left from the end of one clamp portion and protruding from the other clamp portion, the protruding connecting portion (2120) is provided with a recessed notch (213) at its bottom for embedding into the top of the first supporting plate (211) and is screwed in place by a longitudinal screw ( 214) is hinged to the top of the first supporting vertical plate (211), and the protruding connecting portion (2120) is inserted into the first locking pin (215) at its top; a first test contact (2111) for conductively connecting to one end of the tool plunger rod or the calibration plate (200) is provided inside one clamping portion of the first elastic clamp (212), and a second test contact (2112) for conductively connecting to the other end of the tool plunger rod / calibration plate (200) and symmetrically arranged with the first test contact (2111) is provided inside the other clamping portion.

3. The plunger rod resistance testing device according to claim 2, characterized in that: The pressure adjustment assembly (22) includes: a first adjustment screw (221) inserted into the left end surface of the raised connection part (2120), a force adjustment nut (222) for adjusting the depth of the first adjustment screw (221) screwed into the raised connection part (2120), and a second locking pin (223) for locking the first adjustment screw (221). The first elastic clamp (212) has one or more weights (224) placed inside its clamp part with the raised connection part (2120).

4. The plunger rod resistance testing device according to claim 2, characterized in that: The plunger rod fixing mechanism (1) to be tested comprises: a second elastic clamp (11) installed longitudinally, a push-pull assembly (12) for driving the second elastic clamp (11) to move longitudinally, a third test contact (111) for conductively connecting to one end of the plunger rod to be tested / a calibration plate (200) is provided inside one clamping portion of the second elastic clamp (11), and a fourth test contact (112) for conductively connecting to the other end of the plunger rod to be tested / a calibration plate (200) is provided inside the other clamping portion; and a pressure sensor (13) for detecting pressure from the tool plunger rod fixing mechanism (2) is installed on one clamping portion of the second elastic clamp (11).

5. The plunger rod resistance testing device according to claim 4, characterized in that: The push-pull assembly (12) comprises: a base (121) arranged on the chassis (100), a double linear guide rail (122) longitudinally mounted on the base (121), a bottom plate (123) moving longitudinally along the double linear guide rail (122), a push-pull handle (124) connected to one side of the bottom plate (123) for manual pushing and pulling of the bottom plate (123), and a third locking pin (125) for locking the bottom plate (123) when adjusted into position. The second elastic clamp (11) is mounted on the bottom plate (123).

6. The plunger rod resistance testing device according to claim 3, characterized in that: The tool plunger rod fixing mechanism (2) further includes: a first driving assembly (23) for driving the clamping assembly to move laterally, the first driving assembly (23) including: a servo motor (231), a coupling (232) connected to the rotor of the servo motor (231), a screw (233) with an external thread mounted on the coupling (232), a connecting block (234) with an internal thread that can move laterally in conjunction with the screw (233) in a helical transmission, and a transverse slide (235) mounted on the connecting block (234); the first supporting plate (211) stands vertically above the transverse slide (235).

7. The plunger rod resistance testing device according to claim 6, characterized in that: The transverse slide plate (235) is provided with a fine adjustment screw (236) on one side or both sides thereof for performing transverse fine adjustment.

8. The plunger rod resistance testing device according to claim 4, characterized in that: The chassis (100) comprises a bottom shell (101) and a top plate (102) hinged to one end of the bottom shell (101) and capable of turning over. The top plate (102) is fixedly mounted on the top surface of the bottom shell (101) via a tower buckle (103). The bottom shell (101) is provided with four multimeter connection ports (104), a cooling fan (105), a network interface (106), and a power interface (107) on its rear side. The bottom shell (101) is provided with a start button (108) and an emergency stop button (109) on its front side. The bottom shell (101) is provided with handles (110) on its left and right sides.

9. The plunger rod resistance testing device according to claim 1, wherein: The chassis (100) is an aluminum alloy box.

10. The plunger rod resistance testing device according to claim 4, characterized in that: The first test contact (2111), the second test contact (2112), the third test contact (111), and the fourth test contact (112) are gold-plated contacts.

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