Device for testing electrical performance of copper-graphite alloy electrical contact

Abstract

The utility model discloses a device for testing the electrical performance of a copper-graphite alloy electrical contact, and the device comprises a contact motion simulator which comprises a moving contact installation seat which is suitable for the installation of a moving contact, and a static contact installation seat which is suitable for the installation of a static contact. The moving contact mounting seat is connected with the driving device and opens and closes the electric contact under the action of the driving device, and a pull pressure sensor is arranged on the moving contact mounting seat. According to the utility model, by arranging the tension and pressure sensor, the numerical values of tension and pressure borne by the moving contact can be collected, when the numerical values are obviously greater than the conventional numerical values, the contact can be judged to be subjected to fusion welding, and the numerical value of fusion welding force and the fusion welding frequency in multiple tests can be measured.

Description

Technical Field

[0001] The utility model relates to an electrical performance testing device for copper-graphite alloy electric contacts. Background Art

[0002] Electric contacts are an electrical contact structure that is widely used in electrical systems. They are responsible for connecting and disconnecting circuits. Electric contacts are not only affected by composite fields such as electric fields and magnetic fields, but also by arc high temperatures and mechanical shocks when connected and disconnected. Therefore, the material of the electric contact plays an important role in the performance of electrical appliances. Traditional electric contacts widely use silver-based contact materials. In the research on alternative materials for silver-based contacts, copper-based materials still have some problems compared with silver-based materials. Copper-graphite composite materials are a new type of alternative material. There are differences in the electrical properties of electric contacts made of different components and different ratios. By testing the electrical properties of electric contacts to confirm the performance of electric contacts made of different materials, it is necessary to design an electrical performance test device for electric contacts. Utility Model Content

[0003] The utility model aims to provide a device for testing the electrical performance of copper-graphite alloy electrical contacts.

[0004] To this end, the utility model provides an electrical performance testing device for copper-graphite alloy electric contacts, including a contact action simulator, wherein the contact action simulator includes a moving contact mounting seat suitable for mounting a moving contact and a stationary contact mounting seat suitable for mounting a stationary contact, wherein the moving contact mounting seat is connected to a driving device and performs an opening and closing action of the electric contact under the action of the driving device, wherein a tension and pressure sensor is provided on the moving contact mounting seat; and further includes a height gauge, wherein the height gauge is used to measure the opening distance between the moving contact and the stationary contact.

[0005] Furthermore, the driving device includes a servo motor and a screw rod, the servo motor drives the screw rod to rotate, the screw rod includes a nut seat, the nut seat is connected to the tension and pressure sensor, and the tension and pressure sensor is fixed to the moving contact mounting seat.

[0006] Furthermore, the stationary contact mounting seat is provided with an adjustment component, and the adjustment component is used to adjust the relative position between the stationary contact mounting seat and the moving contact mounting seat.

[0007] Furthermore, the static contact mounting seat is fixed on a platform, and the platform is connected to the lifting assembly.

[0008] Furthermore, it also includes a standard ruler, which is aligned with the initial position of the moving contact or the static contact and is used to measure the wear of the electric contact.

[0009] The invention comprises a horizontally arranged lifting and blocking plate and a laser distance measuring module. The lifting and blocking plate moves to contact with the upper surface of the contact, and the laser distance measuring module is used to measure the distance of the lower surface of the lifting and blocking plate.

[0010] Furthermore, the stationary contact adopts a U-shaped structure.

[0011] Furthermore, the static contact mounting seat and the movable contact mounting seat fix the electric contacts by riveting, clamping or fastening.

[0012] The beneficial technical effects of the utility model are:

[0013] (1) The utility model can collect the tensile force and pressure values ​​of the moving contact by setting a tensile and pressure sensor. When the value is significantly greater than the normal value, it can be determined that the contact is welded. The welding force can be obtained and the number of times welding occurs can be calculated in multiple tests.

[0014] (2) The height gauge provided in the utility model can be used to adjust the opening distance between the dynamic and electrostatic contacts, and the opening distance is an important factor affecting the collision and bounce of the electric contacts, and the contact bounce is an important factor causing the arc. This embodiment can measure the electrical performance of the electric contacts under different opening distance conditions.

[0015] (3) In the specific embodiment of the present invention, the standard ruler or the blocking plate laser distance measurement module can be used to measure the wear of the electrical contacts after multiple tests.

[0016] (4) In the specific embodiments of the present invention, the resistance, conductivity and other electrical properties of the electrical contacts can be measured by a voltmeter and an ammeter. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of a specific embodiment of a contact action simulator of the utility model;

[0018] Figure 2 is a schematic diagram of a contact action simulator and an adjustment component;

[0019] Figure 3 is a schematic diagram of the initial positions of the standard ruler and the electrical contacts;

[0020] Figure 4 A schematic diagram of the arrestor plate, electrical contacts and laser ranging assembly;

[0021] Figure 5 Schematic diagram of a U-shaped static contact.

[0022] Explanation of the accompanying drawings: 1. Moving contact mounting seat; 101. Moving contact; 2. Static contact mounting seat; 202. Static contact; 3. Driving device; 301. Nut seat; 4. Tension and pressure sensor; 5. Rack; 6. Platform; 7. Height gauge; 8. Adjustment assembly; 9. Guide rod; 10. Standard ruler; 11. Lifting and lowering barrier plate; 12. Laser ranging module. DETAILED DESCRIPTION

[0023] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined purpose of the utility model, the specific implementation method, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0024] Reference Figures 1 to 5 As shown, the utility model is a copper-graphite alloy electrical contact electrical performance test device, including a contact action simulator, the contact action simulator includes a moving contact mounting seat 1 suitable for mounting a moving contact 101 and a stationary contact mounting seat 2 suitable for mounting a stationary contact 202, the moving contact mounting seat 1 is connected to a driving device 3 and moves relative to the stationary contact under the action of the driving device 3 to realize the opening and closing action of the electrical contact, and a tension pressure sensor 4 is provided on the moving contact mounting seat 1. Figure 1As shown, the contact action simulator also includes a frame 5, a static contact mounting seat 2 is fixed on a platform 6, a moving contact 101 and a static contact 202 are fixed or detachably connected to the corresponding moving contact mounting seat 1 and the static contact mounting seat 2, the moving contact 101 and the static contact 202 are arranged relatively to each other, and achieve closed electrical contact through relative movement, the installation methods of the electric contacts include riveting, clamping and bolt fixing, etc., the moving contact mounting seat 1 and the static contact mounting seat 2 are provided with electrode sheets electrically connected to the electric contacts and insulators for isolating the electrode sheets, it should be noted that the electrode sheets are connected to the wires, and the wires are connected to the control switch, the protection module, the load module and the power module, the above-mentioned control switch, the protection module, the load module and the power module are all prior art, wherein the load module can adopt a circuit with a load (such as a light bulb), the power module includes a transformer and a converter, the transformer is used to adjust the voltage, and the converter can selectively convert the alternating current into direct current. The drive device 3 can include a hydraulic device, a pneumatic device, etc. The pulling and pressure sensor 4 is connected between the driving device 3 and the moving contact mounting seat 1, and the pulling and pressure sensor 4 is electrically connected to the industrial control computer. When the moving contact mounting seat 1 is pushed and pulled under force, the pulling and pressure sensor 4 can collect its force data and send it to the industrial control computer. In the process of the moving contact 101 closing with the static contact 202 under the action of the driving device 3, the momentum balance relationship of the electric contact is involved. When the moving contact 101 hits the static contact 202, the two merge and continue to move at a certain speed for a period of time, then rebound, and the moving contact 101 and the static contact 202 separate and collide for the second time. After multiple collisions, it is stable. This process lasts for about several milliseconds. At the moment when the moving and static contacts vibrate and break multiple times, the air between the moving and static contacts is broken down by the electric field to form an arc. The ablation of the arc may cause the electrical contact material to be heated and melted, so that the moving and static contacts are welded together. When fusion welding occurs, the moving contact 101 needs a greater force to break the fusion welding part, and the pulling and pressure sensor 4 will collect a value significantly greater than the conventional pulling force. The above method can be used to measure the size of the welding force and the number of times welding occurs in multiple tests.

[0025] In the above embodiment, referring to Figure 1As shown, the drive device 3 may also include a servo motor and a screw rod. The servo motor is installed on the frame 5 and drives the screw rod to rotate. The screw rod includes a nut seat 301. The nut seat 301 is connected to the tension and pressure sensor 4. The tension and pressure sensor 4 is fixed to the moving contact mounting seat 1. The nut seat 301 and the moving contact mounting seat 1 are driven to move by the rotation of the screw rod. Preferably, a height gauge 7 is also included. The initial position of the moving contact 101 can be adjusted by the height gauge 7 to facilitate the control and adjustment of the opening distance of the electric contacts. Due to the presence of the electric arc, the contacts are ablated and worn. Different opening distances are important factors that affect the contact bounce and thus the arc ablation. This embodiment adopts a servo motor and a screw rod structure with precise displacement, which is convenient for measuring the welding conditions of the electric contacts under different opening distances. Due to the influence of arc welding, the contacts will wear out during use. Actual products usually use certain methods to ensure that the worn contacts can still be closed, such as using overtravel. In this embodiment, the static contact 202 adopts Figure 5 The U-shaped static contact 202 shown has a certain elastic space, and the displacement set by the drive device 3 is greater than the opening distance, which is used to simulate the welding of electric contacts during the actual use of the product. In actual products, the moving and static contacts usually adopt a certain elastic buffer. Using the U-shaped static contact 202 as a buffer is also closer to the actual use of the product.

[0026] In the above embodiment, referring to Figure 2 As shown, the static contact mounting seat 2 is provided with an adjustment component 8, and the adjustment component 8 is used to adjust the relative position between the static contact mounting seat 2 and the moving contact mounting seat 1. As mentioned above, the electrical contact will be worn during multiple tests. In the process of simulating the use of the actual product, the electrical contact will have a certain change in its opening distance after being worn, that is, the opening distance during the use of the actual product is not fixed, and the test device of the utility model is not only used to simulate the use process of the actual product, but also as a test tool for the electrical properties of new materials, and it is necessary to test the electrical properties of the material itself under the condition of fixed opening distance. The initial positions of the moving and static contacts 202 are generally aligned with the markings of the height gauge 7. When the moving contact 101 and the static contact 202 are worn at the same time, it is difficult to accurately calculate the opening distance by adjusting the position of the moving contact 101. After the adjustment component 8 is set, by adjusting the surface of the static contact 202 to the original scale line, the moving contact 101 is also readjusted to the initial position of the height gauge 7, that is, the opening distance adjustment after the contact wear can be realized quickly and conveniently. Specifically, the stationary contact mounting seat 2 is fixed on the platform 6 , and the platform 6 is connected to the lifting assembly. The lifting assembly can adopt a screw rod structure in the prior art, and guide rods 9 are arranged around the platform 6 .

[0027] In the above embodiment, referring to Figure 3As shown, it also includes a standard ruler 10, which is aligned with the initial position of the moving contact 101 or the static contact 202. After multiple tests, the wear value of the electrical contact is read and measured by comparing the scale line of the standard ruler 10 with the surface position of the electrical contact. Figure 4 As shown, it includes a horizontally arranged lifting blocking plate 11 and a laser ranging module 12. The lifting blocking plate 11 can be provided with a translation mechanism or a rotating component. Taking the rotating component as an example, the lifting blocking plate can be connected to a rotating shaft, and the rotating shaft is connected to a reduction mechanism and a motor to realize rotation. The rotating shaft is connected to the elevator at the same time. The initial position of the lifting blocking plate is flush with the initial position of the electric contact. After multiple tests, the lifting blocking plate is rotated or translated to the upper and lower sides of the surface of the electric contact and is moved by lifting to contact the surface of the contact, and the laser ranging module 12 is used to measure the distance between the initial position and the lower surface of the lifting blocking plate after the movement, so as to obtain the wear condition of the electric contact. The data measured by the laser ranging module 12 can be directly connected to the industrial computer.

[0028] In the above embodiment, a copper-graphite alloy electrical contact electrical performance testing device of the utility model also includes software and hardware in the prior art such as an industrial computer, software, and a control card. The utility model also arranges a voltmeter and an ammeter for measuring the electrical contacts on both sides of the electrical contacts to measure resistance and conductivity, which are prior art and will not be described in detail here.

[0029] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A copper-graphite alloy electrical contact electrical performance test device, including a contact action simulator, characterized in that: The contact action simulator comprises a moving contact mounting seat for mounting a moving contact and a stationary contact mounting seat for mounting a stationary contact. The moving contact mounting seat is connected to a driving device and performs an opening and closing action of an electric contact under the action of the driving device. A tension and pressure sensor is provided on the moving contact mounting seat. Also included is a height gauge, which is used to measure the opening distance between the moving contact and the stationary contact.

2. The electrical performance testing device for copper-graphite alloy electrical contacts according to claim 1, characterized in that: The driving device comprises a servo motor and a screw rod. The servo motor drives the screw rod to rotate. The screw rod comprises a nut seat. The nut seat is connected to a tension and pressure sensor. The tension and pressure sensor is fixed to a moving contact mounting seat.

3. The electrical performance testing device for copper-graphite alloy electrical contacts according to claim 1, characterized in that: The stationary contact mounting seat is provided with an adjustment component, and the adjustment component is used to adjust the relative position between the stationary contact mounting seat and the moving contact mounting seat.

4. The electrical performance testing device for copper-graphite alloy electrical contacts according to claim 3, characterized in that: The static contact mounting seat is fixed on the platform, and the platform is connected to the lifting assembly.

5. The electrical performance testing device for copper-graphite alloy electrical contacts according to claim 4, characterized in that: Also included is a standard ruler, which is aligned with the initial position of the moving contact or the stationary contact and is used to measure the wear of the electric contact.

6. The electrical performance testing device for copper-graphite alloy electrical contacts according to claim 4, characterized in that: The invention comprises a horizontally arranged lifting and blocking plate and a laser distance measuring module. The lifting and blocking plate moves to contact with the surface of the contact, and the laser distance measuring module is used to measure the distance of the lower surface of the lifting and blocking plate.

7. A copper-graphite alloy electrical contact electrical performance testing device according to claim 1 or 2, characterized in that: The stationary contact adopts a U-shaped structure.

8. A copper-graphite alloy electrical contact electrical performance testing device according to claim 1 or 2, characterized in that: The static contact mounting seat and the moving contact mounting seat fix the electric contacts by riveting, clamping or fastening.

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