Contact resistance tester

Abstract

The utility model discloses a contact resistance tester, which relates to the technical field of resistance test equipment and comprises a bottom plate, a base, an adjusting assembly and a test assembly, the base, the adjusting assembly and the test assembly are positioned on the bottom plate, the base is fixed with the bottom plate, a limiting block is arranged on the base, a first electrode is arranged on the upper surface of the base, and the base is used for placing a sample plate to be tested; the adjusting assembly comprises a driving mechanism, a pressing plate and a pressing block, a second electrode is arranged in the pressing plate, the pressing block is electrically connected with the second electrode, the pressing plate abuts against the base through the driving mechanism, and the pressing block abuts against the sample plate to be tested through the driving mechanism; the test assembly comprises a voltmeter, an ampere meter and a power supply, the test assembly is electrically connected with the first electrode, and the test assembly, the first electrode, the sample plate to be tested, the pressing block and the second electrode form a loop. According to the utility model, the pressing block can be accurately pressed on the upper surface of the whole sample plate to be detected, the pressing effect is improved, the operation is simple, and the detection efficiency is high.

Description

Technical Field

[0001] The utility model relates to the technical field of resistance testing equipment, in particular to a contact resistance tester. Background Art

[0002] According to the requirements of the preventive test procedures for power equipment (DL / T 596-1996), the test current of the conductive circuit resistance test of various switchgear shall not be less than 100A. Due to the oxidation of the contact surface and poor contact fastening, the contact resistance increases. When a large current flows, the temperature of the contact point rises, which accelerates the oxidation of the contact surface and further increases the contact resistance. If it continues, serious accidents will occur. It can be said that the existence of contact resistance directly affects the current carrying capacity during normal operation. Statistical analysis of cases where poor contact causes heating of the terminal blocks found that poor contact fastening, that is, insufficient contact pressure, is a major cause of heating. Therefore, it is necessary to study the relationship between contact resistance and contact pressure, so as to provide a reference for on-site maintenance and handover acceptance.

[0003] A Chinese patent with authorization announcement number CN212207515U discloses a simple contact resistance tester device for experimental use. The device presses the sample to be tested against a copper electrode, fully applies pressure and forms a circuit, and then records the readings through an ammeter and a voltmeter to finally obtain the contact resistance of the sample to be tested.

[0004] However, there are still some problems with this solution:

[0005] 1. The upper cover needs to be lifted to put in the sample to be tested, and the operation steps are cumbersome;

[0006] 2. It is necessary to manually place pressure blocks for pressure application, which is troublesome to apply pressure;

[0007] 3. The sample to be tested is placed on the support without being positioned, which may cause uneven force on the sample to be tested after pressurization. Utility Model Content

[0008] The utility model aims to provide a contact resistance tester to solve the problems existing in the background technology.

[0009] The purpose of this utility model is achieved through the following technical solutions:

[0010] A contact resistance tester comprises a bottom plate and a base located on the bottom plate, an adjustment component and a test component, wherein the base is fixed to the bottom plate, a limit block is provided on the base, a first electrode is provided on the upper surface of the base, and the base is used to place a sample to be tested;

[0011] The adjustment assembly includes a driving mechanism, a pressing plate and a pressing block, wherein a second electrode is disposed in the pressing plate, the pressing block is electrically connected to the second electrode, the pressing plate is in contact with the base through the driving mechanism, and the pressing block is in contact with the sample to be tested through the driving mechanism;

[0012] The test assembly comprises a voltmeter, an ammeter and a power supply. The test assembly is electrically connected to the first electrode. The test assembly, the first electrode, the sample to be tested, the pressing block and the second electrode form a loop.

[0013] Furthermore, the driving mechanism is located on one side of the base, and the driving mechanism includes a support column, a motor, a lead screw and a slider. The support column is fixed to the base plate, one end of the lead screw is connected to the motor, and the other end of the lead screw is rotatably connected to the support column. The base of the motor is fixed on the support column, the motor is located on the top of the support column, and the slider is sleeved on the lead screw.

[0014] Furthermore, a groove is provided at the bottom of the pressure plate, the size of the groove is adapted to the size of the pressure block, the size of the pressure plate is larger than the size of the base, a pressure rod is provided above the pressure block, the pressure rod passes through the pressure plate, a connecting plate is provided above the pressure rod, and the connecting plate is connected to the slider.

[0015] Furthermore, a spring is provided between the connecting plate and the pressing plate, one end of the spring is connected to the pressing plate, and the other end of the spring is connected to the pressing plate.

[0016] Furthermore, the size of the lower surface of the pressing plate is adapted to the size of the sample to be tested, a metal sheet is provided on the side wall of the pressing block, the metal sheet is electrically connected to the second electrode, and the pressing block is made of conductive material.

[0017] Furthermore, a pressure sensor is provided at the bottom of the pressing plate.

[0018] Furthermore, the size of the upper surface of the base is larger than the size of the sample to be tested, the limit block is located at a corner of the base, and the inner contour of the limit block is matched with the outer contour of the sample to be tested.

[0019] The beneficial effects of the utility model are:

[0020] 1) The operation steps are simple, the pressing is convenient, the manual operation is reduced, and the detection efficiency is improved. The driving mechanism can automatically complete the pressing of the sample to be tested, and the corresponding data can be detected by the detection component, so as to obtain the relationship between the contact resistance and contact pressure of the sample to be tested.

[0021] 2) The sample to be tested is positioned by the limit block to ensure that the subsequent pressing block can accurately press onto the upper surface of the entire sample to be tested, thereby improving the pressing effect and ensuring the detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a side view of a contact resistance tester of the utility model;

[0023] Figure 2 It is a schematic diagram of the abutment between the middle pressure plate and the base of the utility model;

[0024] Figure 3 It is a schematic diagram of the abutment between the pressure block and the sample to be tested in the utility model;

[0025] Figure 4 This is a schematic diagram of the installation of the pressure plate and the pressure block in the utility model;

[0026] Figure 5 It is a top view of the base in the utility model;

[0027] In the figure, 1-bottom plate, 2-base, 201-first electrode, 202-limiting block, 3-pressing plate, 301-second electrode, 4-testing assembly, 5-driving mechanism, 501-support column, 502-motor, 503-screw, 504-slider, 6-pressing block, 601-pressure sensor, 602-metal sheet, 603-pressure rod, 604-connecting plate, 605-spring, 7-test sample. DETAILED DESCRIPTION

[0028] The following will be combined with the embodiments to clearly and completely describe the technical solution of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0029] See also Figure 1-Figure 5 , the utility model provides a technical solution:

[0030] like Figure 1-Figure 5 As shown, a contact resistance tester comprises a bottom plate 1 and a base 2 located on the bottom plate 1, an adjustment component and a test component 4, wherein the base 2 is fixed to the bottom plate 1, a limit block 202 is provided on the base 2, a first electrode 201 is provided on the upper surface of the base 2, and the base 2 is used to place a sample plate 7 to be tested;

[0031] The adjustment assembly includes a driving mechanism 5, a pressing plate 3 and a pressing block 6, wherein a second electrode 301 is provided in the pressing plate 3, and the pressing block 6 is electrically connected to the second electrode 301, the pressing plate 3 is in contact with the base 2 through the driving mechanism 5, and the pressing block 6 is in contact with the sample 7 to be tested through the driving mechanism 5;

[0032] The test assembly 4 includes a voltmeter, an ammeter and a power supply. The test assembly 4 is electrically connected to the first electrode 201. The test assembly 4, the first electrode 201, the sample to be tested 7, the pressing block 6 and the second electrode 301 form a loop.

[0033] Through the above technical scheme, the sample to be tested 7 is placed on the base 2, and the sample to be tested 7 is positioned by the limit block 202, so as to ensure that the subsequent pressure block 6 can accurately press the upper surface of the entire sample to be tested 7, improve the downward pressure effect, and ensure the detection accuracy; when the sample to be tested 7 is placed, the driving mechanism 5 is started, and the pressing plate 3 and the pressure block 6 are driven by the driving mechanism 5 to move in the direction of the sample to be tested 7. At this time, the pressing plate 3 first abuts against the limit block 202 of the base 2, and then the pressing plate 3 no longer moves downward, and the space between the pressing plate 3 and the base 2 forms the placement and detection area of ​​the sample to be tested 7, and then the pressure block 6 is driven by the driving mechanism 5 to continue to press down, and pressure is applied to the sample to be tested 7 by the pressure block 6. At this time, the test component 4, the first electrode 201, the sample to be tested 7, the pressure block 6 and the second electrode 301 form a circuit, and the current and voltage can be measured by the test component 4, and then the relationship between the contact resistance and contact pressure of the sample to be tested 7 can be obtained.

[0034] Furthermore, the driving mechanism 5 is located on one side of the base 2, and the driving mechanism 5 includes a support column 501, a motor 502, a lead screw 503 and a slider 504. The support column 501 is fixed on the base plate 1, one end of the lead screw 503 is connected to the motor 502, and the other end of the lead screw 503 is rotatably connected to the support column 501. The base of the motor 502 is fixed on the support column 501, the motor 502 is located at the top of the support column 501, and the slider 504 is sleeved on the lead screw 503.

[0035] Through the above technical solution, the motor 502 drives the lead screw 503 to rotate, and then drives the slider 504 matched with the lead screw 503 to move up and down. The driving mechanism 5 can ensure the stability of transmission and improve the precision of downward pressure.

[0036] Furthermore, a groove is provided at the bottom of the pressure plate 3, the size of the groove is adapted to the size of the pressure block 6, the size of the pressure plate 3 is larger than the size of the base 2, a pressure rod 603 is provided above the pressure block 6, the pressure rod 603 passes through the pressure plate 3, a connecting plate 604 is provided above the pressure rod 603, and the connecting plate 604 is connected to the slider 504.

[0037] Through the above technical solution, the pressing block 6 is received in the groove of the pressing plate 3. When there is no downward pressure, the lower surface of the pressing block 6 is flush with the lower surface of the pressing plate 3. Since the pressing block 6 is connected to the pressing rod 603, the pressing rod 603 is connected to the slider 504 through the connecting plate 604, and then the pressing plate 3 and the pressing block 6 are driven to move up and down through the driving mechanism 5.

[0038] Furthermore, a spring 605 is provided between the connecting plate 604 and the pressing plate 3 , one end of the spring 605 is connected to the pressing plate 3 , and the other end of the spring 605 is connected to the pressing plate 3 .

[0039] Through the above technical solution, when the pressure plate 3 abuts against the limit block 202, as the pressure block 6 continues to be pressed down, the connecting plate 604 will compress the spring 605, and at the same time, the pressure block 6 is slidably connected to the pressure plate 3, and the pressure block 6 continues to be pressed down through the pressure rod 603 to abut against the sample 7 to be tested; after the pressure block 6 is lifted up, as the slider 504 moves upward, the pressure plate 3 is driven to be lifted up through the connecting plate 604 and the spring 605.

[0040] Furthermore, the size of the lower surface of the pressing plate 3 is adapted to the size of the sample 7 to be tested, the side wall of the pressing block 6 is provided with a metal sheet 602, the metal sheet 602 is electrically connected to the second electrode 301, and the pressing block 6 is made of conductive material.

[0041] Through the above technical solution, after the pressing plate 3 abuts against the limit block 202, while the pressing block 6 continues to press down, the metal sheet 602 of the pressing block 6 is always connected to the second motor 502 in the inner wall of the pressing plate 3, so that the circuit can always be kept conductive.

[0042] Furthermore, a pressure sensor 601 is provided at the bottom of the pressing plate 3 .

[0043] Through the above technical solution, the pressure sensor 601 of the bottom plate 1 of the pressing plate 3 can detect the pressure of the downward pressure, and the driving mechanism 5 can be accurately adjusted according to the pressure sensor 601.

[0044] Furthermore, the size of the upper surface of the base 2 is larger than the size of the sample 7 to be tested, the limit block 202 is located at a corner of the base 2, and the inner contour of the limit block 202 is adapted to the outer contour of the sample 7 to be tested.

[0045] Through the above technical solution, the limit block 202 can limit the position of the sample plate 7 to be tested, and when the sample plate 7 to be tested is manually placed on the mounting plate, it can be positioned by the limit block 202.

[0046] The above is only a preferred embodiment of the utility model. It should be understood that the utility model is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art do not deviate from the spirit and scope of the utility model, and should be protected by the claims attached to the utility model.

Claims

1. A contact resistance tester, characterized in that: It comprises a bottom plate (1), a base (2) located on the bottom plate (1), an adjustment component and a test component (4), the base (2) being fixed to the bottom plate (1), a limit block (202) being provided on the base (2), a first electrode (201) being provided on the upper surface of the base (2), and the base (2) being used for placing a sample plate (7) to be tested; The adjustment assembly comprises a driving mechanism (5), a pressing plate (3) and a pressing block (6); a second electrode (301) is provided in the pressing plate (3); the pressing block (6) is electrically connected to the second electrode (301); the pressing plate (3) abuts against the base (2) through the driving mechanism (5); and the pressing block (6) abuts against the sample to be tested (7) through the driving mechanism (5); The test component (4) comprises a voltmeter, an ammeter and a power supply. The test component (4) is electrically connected to the first electrode (201). The test component (4), the first electrode (201), the sample to be tested (7), the pressing block (6) and the second electrode (301) form a loop.

2. The contact resistance tester according to claim 1, characterized in that: The driving mechanism (5) is located on one side of the base (2), and comprises a support column (501), a motor (502), a lead screw (503) and a slider (504); the support column (501) is fixed on the base plate (1); one end of the lead screw (503) is connected to the motor (502); the other end of the lead screw (503) is rotatably connected to the support column (501); a base of the motor (502) is fixed on the support column (501); the motor (502) is located on the top of the support column (501); and the slider (504) is sleeved on the lead screw (503).

3. The contact resistance tester according to claim 2, characterized in that: A groove is provided at the bottom of the pressing plate (3), and the size of the groove is matched with the size of the pressing block (6). The size of the pressing plate (3) is larger than the size of the base (2). A pressing rod (603) is provided above the pressing block (6), and the pressing rod (603) passes through the pressing plate (3). A connecting plate (604) is provided above the pressing rod (603), and the connecting plate (604) is connected to the sliding block (504).

4. The contact resistance tester according to claim 3, characterized in that: A spring (605) is provided between the connecting plate (604) and the pressing plate (3); one end of the spring (605) is connected to the pressing plate (3), and the other end of the spring (605) is connected to the pressing plate (3).

5. The contact resistance tester according to claim 2, characterized in that: The size of the lower surface of the pressing plate (3) is adapted to the size of the sample (7) to be tested, a metal sheet (602) is provided on the side wall of the pressing block (6), the metal sheet (602) is electrically connected to the second electrode (301), and the pressing block (6) is made of conductive material.

6. The contact resistance tester according to claim 2, characterized in that: A pressure sensor (601) is provided at the bottom of the pressing plate (3).

7. The contact resistance tester according to claim 1, characterized in that: The size of the upper surface of the base (2) is larger than the size of the sample plate (7) to be tested, the limit block (202) is located at a corner of the base (2), and the inner contour of the limit block (202) is matched with the outer contour of the sample plate (7) to be tested.

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