A carbon brush wear life test device and test bench

Abstract

The present invention discloses a carbon brush wear life test equipment and a test bench, which relates to the field of carbon brush testing, including a transmission shaft and a shaft end test device, the transmission shaft is rotated by a driving device, the shaft end test device is at least one and corresponds to the end of the transmission shaft, the shaft end test device includes a friction component, a first grounding device, a collector ring and a conductive module, the friction component is connected to the end of the transmission shaft, the first grounding device is arranged opposite to the friction component, the first carbon brush to be tested is fixed by the first grounding device and abuts against the friction component; the collector ring is sleeved on the transmission shaft and connected to the friction component, the collector ring is connected to the conductive module; the conductive module is electrically connected to the first grounding device, and forms a loop with a current generator; and further includes: an insulating sleeve, the insulating sleeve isolates the collector ring from the transmission shaft. The technical effect of the present invention is that the wear degree of carbon brushes of multiple brands can be detected simultaneously in the axial and radial directions, and the service life of the transmission shaft is extended.

Description

Technical Field

[0001] The invention relates to the field of carbon brush testing, in particular to a carbon brush wear life testing device and a test bench. Background Art

[0002] As one of the components of locomotives and vehicles, the grounding device is a key component of rail transportation. The quality inspection of the grounding device is crucial to ensuring the safety of railway transportation.

[0003] In the prior art, the grounding device tests the carbon brush wear life according to the test method specified in the standard JBT 8155-2001 "Test Method for Running Performance of Electric Brushes for Motors". At present, the existing grounding device carbon brush wear test bench usually uses a transmission shaft to conduct power-on wear detection on the shaft end grounding device and the gearbox grounding device. During the detection, the grounding device and carbon brush used in actual application are selected, energized at the rated current, and operated at the rated speed. After the equipment has been running for a period of time (300h or 500h), the wear length of the carbon brush is measured, and the carbon brush wear kilometer life is calculated, which provides a strong reference for the selection of the grounding carbon brush brand and provides a basis for the maintenance mileage of the grounding carbon brush. However, since the current when power is on will pass through the transmission shaft, causing a large amount of electrical heating in the bearing, it will not only affect the experimental data, but also reduce the service life of the transmission shaft and affect the experimental results. Summary of the invention

[0004] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is to avoid electrical heating caused by current passing through the transmission shaft.

[0005] To achieve the above-mentioned purpose, the present invention provides a carbon brush wear life test device, characterized in that it includes a transmission shaft and a shaft end test device, the transmission shaft is rotated by a driving device, the shaft end test device is at least one and corresponds to the end of the transmission shaft one by one, the shaft end test device includes a friction component, a first grounding device, a collector ring and a conductive module, the friction component is connected to the end of the transmission shaft, the first grounding device is arranged opposite to the friction component, the first carbon brush to be tested is fixed by the first grounding device and abuts against the friction component; the collector ring is sleeved on the transmission shaft and connected to the friction component, the collector ring is connected to the conductive module; the conductive module is electrically connected to the first grounding device to form a loop with the current generator;

[0006] It also includes: an insulating sleeve, which isolates the collector ring from the transmission shaft.

[0007] Furthermore, the conductive module is also used to fix the second carbon brush to be tested, and the conductive module is arranged in the radial direction of the transmission shaft, and the second carbon brush to be tested is abutted against the collector ring through the conductive module.

[0008] Furthermore, the shaft end test device at one end of the transmission shaft is connected in series with the shaft end test device at the other end of the transmission shaft, and the conductive module of the shaft end test device at one end of the transmission shaft is connected with the conductive module of the shaft end test device at the other end of the transmission shaft through a wire.

[0009] Furthermore, the insulating sleeve comprises: an insulating gasket and an insulating sleeve, the insulating sleeve is sleeved on the end of the transmission shaft, and the insulating gasket is installed on the contact surface between the collector ring and the transmission shaft.

[0010] Furthermore, the first grounding device comprises a first grounding device constant force spring, and the first grounding device constant force spring elastically abuts the first carbon brush to be tested against the friction component.

[0011] Furthermore, the conductive module includes a conductive module constant force spring, and the conductive module constant force spring elastically abuts the second carbon brush to be tested against the collector ring.

[0012] The present invention also provides a carbon brush wear life test bench, which comprises a plurality of carbon brush wear life test devices as described above.

[0013] Furthermore, it also includes a computer control terminal, which is connected to the drive device and the power supply.

[0014] Furthermore, it also includes: an air supply device, the air supply device is facing the carbon brush wear life test bench, and the air supply device is connected to the computer control terminal.

[0015] The technical effect of the present invention is that the wear degree of carbon brushes of multiple brands can be detected simultaneously in the axial and radial directions, and the current trend is optimized, thereby extending the service life of the transmission shaft.

[0016] The concept, specific structure and technical effects of the present invention will be further described below in conjunction with the accompanying drawings to fully understand the purpose, characteristics and effects of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0018] Figure 1 A structural front view and a cross-sectional view thereof of an embodiment of the present invention;

[0019] Figure 2 A cross-sectional view of the structure of a collector ring in one embodiment of the present invention;

[0020] Figure 3 It is a structural diagram of the experimental platform of the present invention;

[0021] Figure 4 A top view of the experimental platform of the present invention;

[0022] Figure 5 It is a schematic diagram of the composition of the experimental platform of the present invention.

[0023] Explanation of the reference numerals: 1-conductive module; 100-second carbon brush to be tested; 2-pulley; 3-first grounding device; 4-transmission shaft; 5-pad; 6-friction component; 7-bearing; 8-bearing seat; 9-collector ring; 10-grounding device bracket; 91-steel ring; 92-insulating gasket; 93-insulating sleeve; 10-grounding device bracket; 11-computer control terminal; 12-shield; 13-air supply system; 16-inverter electronic control system; 17-belt; 20-current generating device. DETAILED DESCRIPTION

[0024] The following describes several preferred embodiments of the present invention with reference to the drawings in the specification, so that the technical content is clearer and easier to understand. The present invention can be embodied in many different forms of embodiments, and the protection scope of the present invention is not limited to the embodiments mentioned in the text.

[0025] In the drawings, components with the same structure are indicated by the same numerical reference numerals, and components with similar structures or functions are indicated by similar numerical reference numerals. The size and thickness of each component shown in the drawings are arbitrarily shown, and the present invention does not limit the size and thickness of each component. In order to make the illustration clearer, the thickness of the components is appropriately exaggerated in some places in the drawings.

[0026] like Figure 1 As shown, the present invention discloses a carbon brush wear life test device, including a transmission shaft 4 and a shaft end test device, the transmission shaft 4 is rotated by a driving device, the shaft end test device is at least one and corresponds to the end of the transmission shaft 4, the shaft end test device includes a friction component 6, a first grounding device 3, a collector ring 9 and a conductive module 1, the friction component 6 is connected to the end of the transmission shaft 4, the first grounding device 3 is arranged opposite to the friction component 6, and the first carbon brush to be tested is fixed by the first grounding device 3 and abuts against the friction component 6. The collector ring 9 is sleeved on the transmission shaft 4 and connected to the friction component 6, and the collector ring 9 is connected to the conductive module 1. The conductive module 1 is electrically connected to the first grounding device 3 to form a loop with the current generator 20. An insulating sleeve is also included to isolate the collector ring 9 from the transmission shaft 4.

[0027] The first grounding device 3 can fix the first carbon brush to be tested. After the first carbon brush to be tested abuts against the friction component 6, the driving device of the transmission shaft 4 is turned on, so that the transmission shaft 4 runs at the rated speed, driving the friction component 6 fixed at one end thereof to rotate together. In this embodiment, the friction component 6 uses a friction disk, and can also be other friction components that cause axial wear on the first brush to be tested, which is not limited here. After the equipment has been running for a period of time, the wear length of the carbon brush during the shaft end friction can be measured, so as to calculate the number of kilometers of carbon brush wear and use life, which provides a strong reference for the selection of the grounding carbon brush brand. In addition, in order to further simulate the working environment of the carbon brush, the current generator 20 can be used to energize the first carbon brush to be tested. At this time, the current flows out from the current generator 20, passes through the first grounding device 3 and the first carbon brush to be tested fixed thereon, passes through the friction component 6 to the collector ring 9, and then returns to the current generator 20 through the conductive module 1 to form a loop. The collector ring 9 is sleeved on the transmission shaft 4, and is installed on the transmission shaft 4 through an interference fit with the transmission shaft 4, and is positioned and connected with a flat key. Therefore, the collector ring 9 can also rotate along with the rotation of the transmission shaft 4. The conductive module 1 can be a common carbon brush to transmit current when the collector ring 9 rotates at a high speed.

[0028] In addition, the present embodiment further comprises a bearing 7 and a bearing frame 8, a pad 5 is used to support the bearing frame 8, a pulley 2 is installed at the center of the transmission shaft 4, the pulley 2 is connected to the driving device through a belt 17, after the driving device starts to rotate, the belt 17 drives the pulley 2, and even the transmission shaft 4 to rotate. The grounding device bracket 10 is used to support the first grounding device 3, and matches the height of the pad 5, so that the axial center height of the transmission shaft is consistent with the axial center height of the first grounding device 3.

[0029] Since the current may partially flow to the drive shaft 4 during the current transmission process, causing electrical heating, affecting the experimental results, and shortening the service life of the drive shaft 4, an insulating sleeve is added between the collector ring 9 and the drive shaft 4 to block the current, so that the current can directly return to the current generating device 20 through the conductive module 1 when flowing through the collector ring 9, thereby extending the service life of the drive shaft 4.

[0030] Further, the conductive module 1 is also used to fix the second carbon brush 100 to be tested. The conductive module 1 is arranged in the radial direction of the transmission shaft 4. The second carbon brush 100 to be tested abuts against the collector ring 9 through the conductive module 1. Since the conductive module 1 also uses a carbon brush, the carbon brush in the conductive module 1 can also be used to test the radial wear of the carbon brush at high speed and calculate the mileage of the brush during radial friction. At this time, the collector ring 9 also includes the function of radially rubbing the second carbon brush 100 to be tested. In other words, the conductive module 1 at this time is equivalent to the gearbox grounding device. In order to make the collector ring 9 and the second carbon brush 100 to be tested produce friction, the surface of the collector ring 9 should have a certain roughness and a certain hardness relative to the smooth surface of the conventional collector ring. The surface roughness of the collector ring 9 is preferably 0.75 to 1.6 microns, the Brinell hardness is 160 to 250HB, preferably 205HB, and the specific hardness of the collector ring 9 is adjusted by heat treatment. In order to better simulate the wear of the second carbon brush 100 to be tested in the conductive module 1, that is, the gearbox grounding device in actual working conditions. The material of the collector ring 9 is the same as that of the conductive module 1, preferably steel-35. In this way, the influence of axial wear and radial wear on the wear life of the carbon brush can be tested simultaneously in one experiment.

[0031] Furthermore, if Figure 2 As shown, the insulating sleeve includes: an insulating gasket 92 and an insulating sleeve 93. The insulating sleeve 93 is sleeved on the end of the transmission shaft 4 to isolate the end surface portion where the steel ring 91 of the collector ring 9 contacts the transmission shaft 4. The insulating gasket 92 is installed on the contact surface between the collector ring 9 and the transmission shaft 4 to fully block the current flowing to the transmission shaft 4.

[0032] Furthermore, since the transmission shaft 4 has two ends, a shaft end test device can be provided at each end of the transmission shaft 4 to test more brushes to be tested at the same time. At the same time, multiple brushes to be tested can also be installed on the first grounding device 3 and the conductive module 1 at the same time, and the number of brushes to be tested at the same time can also be further increased to speed up the test efficiency. In the case where the shaft end test device is provided at each end of the transmission shaft 4, there can be two current generating devices to respectively energize the shaft end test devices at both ends of the transmission shaft 4. The shaft end test devices at both ends of the transmission shaft 4 can also be connected in series, and the shaft end test device at one end is connected in series with the shaft end test device at the other end of the transmission shaft 4. At this time, after the shaft end test device at one end of the transmission shaft 4 flows through the conductive module 1, the current flows to the conductive module 1 of the shaft end test device at the other end of the transmission shaft 4 through the connecting wire, and then flows normally to the first grounding device 3 of the shaft end test device at the other end of the transmission shaft 4, and then returns to the current generator 20. After the shaft end test devices at both ends are connected in series by wires, the current will not be transmitted through the transmission shaft 4, so as to avoid the electric heating of the transmission shaft 4 after power-on, which affects the experimental results, and prolongs the service life of the transmission shaft 4. Similarly, there may be multiple transmission shafts 4, that is, when there are multiple shaft end test devices at the same time, each shaft end test device can be connected in series through a wire, that is, their conductive modules 1 are connected to each other, which can also change the direction of current flow and protect the transmission shaft 4.

[0033] Furthermore, the first grounding device 3 comprises a first grounding device constant force spring, and the first grounding device constant force spring elastically abuts the first carbon brush to be tested against the friction component 6 .

[0034] Furthermore, the conductive module 1 includes a conductive module constant force spring, and the conductive module constant force spring elastically abuts the second carbon brush to be tested 100 against the collector ring 9 .

[0035] When the transmission shaft 4 rotates, the first grounding device 3 and the friction component 6 generate mutual friction loss, and the conductive module 1 and the collector ring 9 generate mutual friction loss. In order to ensure that the carbon brushes to be tested on the first grounding device 3 and the conductive module 1 are fully in contact with the friction component 6 and the collector ring 9, a constant force spring is introduced on the first grounding device 3 and the conductive module 1. When the brushes to be tested are lost due to friction, the constant force spring can push the brushes to be tested toward the collector ring 9 or the friction component 6 through elasticity.

[0036] The present invention also discloses a carbon brush wear life test bench, such as Figures 3 to 5 As shown, the carbon brush wear life test bench includes multiple aforementioned carbon brush wear life test devices, the arrangement direction of the transmission shaft 4 is not limited, the driving device can drive multiple transmission shafts 4 at the same time, and multiple driving devices can also be introduced to drive multiple transmission shafts 4 to rotate respectively.

[0037] Furthermore, it also includes: a temperature sensor, which is arranged on the side of the shaft end test device and is used to monitor the heat generated by friction during the operation of the shaft end test device and to give an alarm in time.

[0038] Furthermore, it also includes a computer control terminal 11, which includes a PLC control system and a digital control display screen component, and is connected to a drive device, a current generator 20 and a temperature sensor. The computer control terminal 11 includes a PLC control system and a digital control display screen component, and is connected to a drive device, a current generator 20 and a temperature sensor. Through the digital control display screen, the detected real-time data, such as temperature, speed and other information, are displayed on the display screen. The control panel is provided with a status indicator light, which indicates the equipment operation status and abnormal alarm one by one, and is provided with an alarm release button

[0039] Furthermore, it also includes: an air supply device 13, which faces the carbon brush wear life test bench and is connected to the computer control terminal 11. According to the real-time feedback of the temperature sensor, the start-up time of the sealing device 13 can be determined to keep the bench at a suitable temperature.

[0040] Furthermore, the test bench also includes a protective cover 12 to shield external dust and protect the user from the transmission shaft 4 running at high speed.

[0041] Furthermore, it also includes a frequency converter control system 16. The frequency converter can change the power supply frequency, thereby adjusting the load, reducing power consumption, reducing losses, and extending the service life of the equipment. The frequency converter controls the drive device to control the speed of the equipment. Through the frequency converter control, various operating speed tests can be performed to obtain ideal test results.

[0042] The preferred specific embodiments of the present invention are described in detail above. It should be understood that ordinary technicians in the field can make many modifications and changes based on the concept of the present invention without creative work. Therefore, all technical solutions that can be obtained by technicians in the technical field based on the concept of the present invention through logical analysis, reasoning or limited experiments on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. A carbon brush wear life test device, characterized in that: It comprises a transmission shaft and a shaft end test device, the transmission shaft is rotated by a driving device, the shaft end test device is at least one and corresponds to the end of the transmission shaft one by one, the shaft end test device comprises a friction component, a first grounding device, a collector ring and a conductive module, the friction component is connected to the end of the transmission shaft, the first grounding device is arranged opposite to the friction component, the first carbon brush to be tested is fixed by the first grounding device and abuts against the friction component; the collector ring is sleeved on the transmission shaft and connected to the friction component, and the collector ring is connected to the conductive module; The conductive module is electrically connected to the first grounding device to form a loop with the current generator; It also includes: an insulating sleeve, wherein the insulating sleeve isolates the collector ring from the transmission shaft; The conductive module is also used to fix the second carbon brush to be tested. The conductive module is arranged in the radial direction of the transmission shaft. The second carbon brush to be tested is in contact with the collector ring through the conductive module.

2. The carbon brush wear life testing device according to claim 1, characterized in that: The shaft end test device at one end of the transmission shaft is connected in series with the shaft end test device at the other end of the transmission shaft, and the conductive module of the shaft end test device at one end of the transmission shaft is connected with the conductive module of the shaft end test device at the other end of the transmission shaft through a wire.

3. The carbon brush wear life testing device according to claim 1, characterized in that: The insulating sleeve comprises: an insulating gasket and an insulating sleeve. The insulating sleeve is sleeved on the end of the transmission shaft, and the insulating gasket is installed on the contact surface between the collector ring and the transmission shaft.

4. The carbon brush wear life testing device according to claim 1, characterized in that: The first grounding device comprises a first grounding device constant force spring, and the first grounding device constant force spring elastically contacts the first carbon brush to be tested against the friction component.

5. The carbon brush wear life testing device according to claim 1, characterized in that: The conductive module comprises a conductive module constant force spring, and the conductive module constant force spring elastically abuts the second carbon brush to be tested against the collector ring.

6. A carbon brush wear life test bench, characterized in that: The carbon brush wear life test bench comprises a plurality of carbon brush wear life test devices according to any one of claims 1 to 5.

7. The carbon brush wear life test bench according to claim 6, characterized in that: It also includes a computer control terminal, which is connected to the drive device and the power supply.

8. The carbon brush wear life test bench according to claim 7, characterized in that: Also includes: An air supply device, the air supply device is directly facing the carbon brush wear life test bench, and the air supply device is connected to the computer control terminal.

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