Sliding electric contact test module

Abstract

The utility model provides a sliding electric contact test module in the technical field of frictional wear test, which comprises a lower plate, an upper plate is arranged above the lower plate, a through hole is arranged in the middle of the upper plate, the lower plate is rotatably connected with a rotating table, the diameter of the rotating table is smaller than the inner diameter of the through hole, the rotating table is detachably connected with a current collecting disc, and the current collecting disc is detachably connected with the upper plate. Two groups of pressing mechanisms are arranged on the upper plate, each pressing mechanism comprises a carbon brush, one end of each carbon brush can be in pressing contact with a current collecting disc, the other end of each carbon brush is provided with a first electric wire, a liftable sample rod is further included, the sample rod is detachably connected with an electric brush sample, the electric brush sample can be in contact with the current collecting disc, and the electric brush sample is electrically connected with a second electric wire. The wire I and the wire II can be electrically connected with a power supply respectively; the device is simple in structure, convenient to detect and low in use cost.

Description

Technical Field

[0001] The utility model belongs to the technical field of friction and wear testing, and in particular relates to a sliding electrical contact testing module. Background Art

[0002] Sliding electrical contact refers to the electrical contact established between two conductive materials through contact and relative motion. It is usually used to transmit current or signals between moving parts and fixed parts, and therefore involves issues of material friction, wear, and conductivity. Sliding electrical contact occurs when two surfaces of conductive materials contact each other under a certain pressure and move relative to each other. Friction and wear will occur between the two materials, and at the same time, there is contact resistance between the contact surfaces. The thermal effect of the current will generate local heat and even form an electric arc. This heat will cause the temperature near the contact point to rise, which may exceed the material's tolerance range, causing phenomena such as softening, oxidation, melting, or ablation of the material, resulting in material wear, aggravated electrical contact performance degradation. By conducting sliding electrical contact experiments, technicians study the changes in the friction coefficient, wear rate, and contact resistance of different materials under different working conditions, so as to more accurately understand the sliding electrical contact performance of the material.

[0003] In the prior art, a Chinese patent entitled "A high-speed, high-current sliding current-carrying friction and wear tester and test method" is disclosed, with an application publication date of 20221018 and an application publication number of CN 115201045 A. The device includes a driving device and a loading device. The output end of the driving device is connected to a first sample, and a second sample is installed on the loading device. The second sample is driven up and down by the loading device, and the first sample and the second sample contact to form a friction pair. The driving device and the loading device cooperate to make the second sample produce different friction tracks on the surface of the first sample. However, this type of current-carrying friction and wear tester occupies a large volume, is expensive, has high requirements for test conditions, and has a complex structure, inconvenient maintenance, and high cost of use. Utility Model Content

[0004] In view of the defects in the existing technology, the purpose of the present invention is to solve the shortcomings of the existing technology, solve the technical problems of complex structure and high cost in the existing technology, and provide a sliding electrical contact test module. This device has a simple structure, easy detection and low cost.

[0005] The purpose of the utility model is achieved as follows: a sliding electrical contact test module, comprising a lower plate, an upper plate is provided above the lower plate, a through hole is opened in the middle of the upper plate, a rotating table is rotatably connected to the lower plate, the diameter of the rotating table is smaller than the inner diameter of the through hole, a collecting plate is detachably connected to the rotating table, two groups of clamping mechanisms are symmetrically provided on the upper plate, the clamping mechanism comprises a carbon brush, one end of the carbon brush can be pressed and contacted with the collecting plate, the other end of the carbon brush is provided with a wire 1, and also comprises a liftable sample rod, a brush sample is detachably connected to the sample rod, the brush sample can contact the collecting plate, the brush sample is electrically connected to wire 2, and wire 1 and wire 2 can be electrically connected to a power supply respectively.

[0006] In the present invention, wire 2 is electrically connected to the positive pole of the power supply, so that the brush sample is input with positive current. A carbon brush of a clamping mechanism is called a negative carbon brush. Wire 1 corresponding to the negative carbon brush is electrically connected to the negative pole of the power supply through a resistor, and flows through the collecting disk to realize a circuit loop. The brush of the other clamping mechanism is called an auxiliary carbon brush. Wire 1 corresponding to the auxiliary carbon brush is electrically connected to the brush sample through a multimeter. Before the test, the sample rod is adjusted so that the brush sample is just in contact with the collecting disk. During the test, the rotating table rotates, and friction motion is generated between the brush sample and the rotating table to simulate the sliding electrical contact friction and wear working conditions. The brush sample, negative carbon brush, auxiliary carbon brush, etc. are jointly set to realize the measurement of parameters such as circuit loop and voltage. Then, the changes in friction coefficient, wear rate and contact resistance can be obtained through calculation, so as to accurately understand the sliding electrical contact performance of the material and facilitate testing. The present invention has a simple structure and is easy to test, and can be applied to electrical contact friction performance experiments of materials.

[0007] In order to achieve the carbon brushes being pressed against the collecting plate, two brush boxes are symmetrically provided on the upper plate, the brush boxes are connected to a swing head, and an insulating pressure block is provided on the upper end of the swing head, which presses the carbon brushes against the collecting plate.

[0008] In order to enable the insulating pressure block to apply thrust to the carbon brush, the clamping mechanism also includes a tension spring, one end of the tension spring is connected to the swing head, and the other end of the tension spring is connected to the brush box. The insulating pressure block is in contact with the carbon brush under the elastic action of the tension spring.

[0009] In order to fix the brush box on the upper plate, a pad is provided on the upper plate, and the brush box can be fixed on the pad via bolts.

[0010] In order to realize the rotation of the rotating platform, a driving motor is provided on the lower plate, and the driving rotating platform is connected to the output shaft of the driving motor.

[0011] In order to achieve detachable connection of the sample brush, the sample rod includes a rod head, one end of the rod head is connected to the rod handle, and the other end of the rod head is threadedly connected to the sample chuck. At least one connecting hole is opened on the sample chuck, and the brush sample can be fixed on the sample chuck by the cooperation of the bolt and the connecting hole.

[0012] As a further improvement of the present invention, a thermocouple is provided on one side of the brush sample.

[0013] As a further improvement of the present invention, a conductive hole is provided on the rod head, and the second wire can be electrically connected to the sample chuck and the brush sample through the conductive hole.

[0014] As a further improvement of the present invention, an insulating disk is provided between the rotating table and the current collecting disk, and the current collecting disk, the insulating disk and the rotating table are connected in sequence via insulating bolts.

[0015] As a further improvement of the present invention, four supporting columns arranged in a rectangular shape are provided on the lower plate, and the upper plate is fixed to the supporting columns by bolts. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is the overall structure diagram of the utility model.

[0017] Figure 2 It is a front view of the utility model.

[0018] Figure 3 This is a schematic diagram of the clamping mechanism of the present utility model.

[0019] Figure 4 Schematic diagram of the explosion of the sample rod.

[0020] Figure 5 Schematic diagram of the current loading system principle.

[0021] Among them, 1 sample rod, 2 insulating bolt, 3 collecting plate, 4 auxiliary carbon brush, 5 clamping mechanism, 6 negative carbon brush, 7 brush sample, 8 spacer, 9 rotating table, 10 upper plate, 11 support column, 12 lower plate, 13 insulating plate, 14 insulating pressure block, 15 pressure plate, 16 swing head, 17 tension spring, 18 brush box, 19 rod handle, 20 insulating sleeve, 21 rod head, 22 chuck, 23 alumina ceramic tube, 24 K-type thermocouple. DETAILED DESCRIPTION

[0022] The present invention will be further described below with reference to the accompanying drawings.

[0023] like Figures 1 to 5The sliding electrical contact test module shown in the figure includes a lower plate 12, an upper plate 10 is provided above the lower plate 12, a through hole is opened in the middle of the upper plate 10, a rotating table 9 is rotatably connected to the lower plate 12, a driving motor is provided on the lower plate 12, the rotating table 9 is connected to the output shaft of the driving motor, the diameter of the rotating table 9 is smaller than the inner diameter of the through hole, a collecting plate 3 is detachably connected to the rotating table 9, an insulating plate 13 is provided between the rotating table 9 and the collecting plate 3, and the collecting plate 3, the insulating plate 13 and the rotating table 9 are sequentially connected by insulating plates. Bolt 2 is connected, and four support columns 11 arranged in a rectangular shape are provided on the lower plate 12. The upper plate 10 is fixed to the support columns 11 by bolts. Two sets of clamping mechanisms 5 are provided on the upper plate 10. The clamping mechanism 5 includes a carbon brush, one end of the carbon brush can be pressed and contacted with the collecting plate 3, and the other end of the carbon brush is provided with a wire 1. It also includes a liftable sample rod 1, and a brush sample 7 is detachably connected to the sample rod 1. A thermocouple is provided on one side of the brush sample 7. The brush sample 7 can contact the collecting plate 3, and the brush sample 7 is electrically connected to the wire 2. Wire one and wire two can be electrically connected to the power supply respectively. Two brush boxes 18 are symmetrically provided on the upper plate 10. The brush box 18 is connected to the swing head 16. The upper end of the swing head 16 is provided with a pressure plate 15. The pressure plate 15 is provided with an insulating pressure block 14. The insulating pressure block 14 presses the carbon brush against the collecting plate 3. The clamping mechanism 5 also includes a tension spring 17. One end of the tension spring 17 is connected to the swing head 16. The other end of the tension spring 17 is connected to the brush box 18. The insulating pressure block 14 presses against the carbon brush under the elastic action of the tension spring 17. The brush box 18 can be fixed to the pad 8 via bolts. The sample rod 1 includes a rod head 21, one end of the rod head 21 is connected to the rod handle 19 via an insulating sleeve 20, and the other end of the rod head 21 is threadedly connected to the sample chuck 22. The sample chuck 22 has at least one connecting hole. The brush sample 7 can be fixed to the sample chuck 22 by the cooperation of the bolt and the connecting hole. The rod head 21 has a conductive hole. The second wire can be electrically connected to the sample chuck 22 and the brush sample 7 via the conductive hole.

[0024] In the present invention, the sample rod 1 can be set on a conventional lifting and clamping mechanism in the prior art (such as the lifting and clamping mechanism of CN114516066A) or an existing friction and wear testing machine (such as the friction and wear testing machine of publication number CN113686656A). The tension spring 17 is initially in a stretched state and has a tensile force to make the insulating pressure block 14 press the carbon brush. The rod handle 19 and the rod head 21 are made of insulating material. The thermocouple is preferably a K-type thermocouple. The K-type thermocouple is inserted into the alumina ceramic tube 23 and fixed with a thermally conductive adhesive to prevent The brush current flows through the thermocouple, affecting the temperature measurement signal. The K-type thermocouple can simultaneously measure the temperature change of the brush sample 7. Wire 2 is electrically connected to the positive pole of the power supply, realizing that the brush sample 7 is the positive current input. Through the collecting plate 3, the carbon brush of a clamping mechanism 5 is called the negative carbon brush 6. The wire 1 corresponding to the negative carbon brush 6 is electrically connected to the negative pole of the power supply through a resistor to realize the circuit loop. The brush of the other clamping mechanism 5 is called the auxiliary carbon brush 4. The wire 1 corresponding to the auxiliary carbon brush 4 is electrically connected to the brush sample 7 through a multimeter (the multimeter is prior art and is not shown in the drawings. How a multimeter detects voltage is not described in detail herein. The circuit loop and voltage parameters are measured. The voltage drop between the brush sample 7 and the current collecting disc 3 is measured. The height of the sample rod 1 is adjusted via a lifting and clamping mechanism (this lifting and clamping mechanism is prior art and is not shown in the accompanying drawings and will not be described in detail herein). This ensures that the brush sample 7 and the current collecting disc 3 are in contact and meet the experimental requirements. During the test, the drive motor rotates the rotary table 9, generating friction between the brush sample 7 and the current collecting disc 3, simulating sliding electrical contact friction and wear conditions. The brush sample 7, negative electrode carbon brush 6, and auxiliary carbon brush 4 are combined to measure parameters such as the circuit loop and voltage. The contact resistance between the friction pairs is then calculated using these parameters. Furthermore, changes in the friction coefficient, wear rate, and contact resistance can be determined using a friction and wear testing machine. Current-carrying friction and wear tests under various conditions, such as current-carrying rotational friction and current-carrying micro-friction, are conveniently and quickly performed, enabling accurate understanding of the sliding electrical contact performance of the material. The present utility model has a simple structure and is easy to test, and can be applied to electrical contact friction performance experiments of materials.

[0025] This utility model patent is not limited to the above examples. On the basis of the technical solution disclosed in this utility model patent, technicians in this field can make some replacements and deformations of some of the technical features according to the disclosed technical content without creative labor, and these replacements and deformations are all within the scope of protection of this utility model patent.

Claims

1. A sliding electrical contact test module, characterized in that: It includes a lower plate, an upper plate is provided above the lower plate, a through hole is opened in the middle of the upper plate, a rotating table is rotatably connected to the lower plate, the diameter of the rotating table is smaller than the inner diameter of the through hole, a collecting plate is detachably connected to the rotating table, two sets of clamping mechanisms are provided on the upper plate, the clamping mechanism includes a carbon brush, one end of the carbon brush can clamp the collecting plate, the other end of the carbon brush is provided with a wire 1, and it also includes a liftable sample rod, a brush sample is detachably connected to the sample rod, the brush sample can contact the collecting plate, the brush sample is electrically connected to wire 2, and wire 1 and wire 2 can be electrically connected to a power supply respectively.

2. The sliding electrical contact test module according to claim 1, characterized in that: Two brush boxes are symmetrically arranged on the upper plate, and a swing head is connected to the brush box. A pressure plate is provided on the upper end of the swing head, and an insulating pressure block is provided on the pressure plate. The insulating pressure block presses the carbon brush against the collecting plate.

3. The sliding electrical contact test module according to claim 2, characterized in that: The pressing mechanism further comprises a tension spring, one end of which is connected to the swing head, and the other end of which is connected to the brush box. The insulating pressing block contacts the carbon brush under the elastic action of the tension spring.

4. The sliding electrical contact test module according to claim 3, characterized in that: A cushion block is provided on the upper plate, and the brush box can be fixed on the cushion block via bolts.

5. The sliding electrical contact test module according to claim 3, characterized in that: The lower plate is provided with a driving motor, and the rotating platform is connected to the output shaft of the driving motor.

6. The sliding electrical contact test module according to claim 1, characterized in that: The sample rod includes a rod head, one end of which is connected to a rod handle, and the other end of which is threadedly connected to a sample chuck. The sample chuck is provided with at least one connecting hole, and the brush sample can be fixed on the sample chuck by a bolt engaging the connecting hole.

7. The sliding electrical contact test module according to claim 6, characterized in that: A thermocouple is provided on one side of the brush sample.

8. The sliding electrical contact test module according to claim 7, characterized in that: A conductive hole is provided on the rod head, and the second wire can be electrically connected to the sample chuck and the brush sample through the conductive hole.

9. The sliding electrical contact test module according to claim 8, characterized in that: An insulating disk is provided between the rotating platform and the current collecting disk, and the current collecting disk, the insulating disk and the rotating platform are connected in sequence via insulating bolts.

10. The sliding electrical contact test module according to any one of claims 1 to 9, characterized in that: The lower plate is provided with four supporting columns arranged in a rectangular shape, and the upper plate is fixed on the supporting columns by bolts.

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