A brake pad friction coefficient consistency detection device

Abstract

The application relates to the technical field of friction coefficient detection, in particular to a brake pad friction coefficient consistency detection equipment which can detect the friction coefficient of brake pads under different temperatures, is convenient to use, has low limitations and high practicability; the equipment comprises a bottom plate; the equipment also comprises an electric rotating disc A, a supporting plate, a torque motor, a rotating shaft, a fixing plate, a friction disc, a supporting table, a pressure sensor, a heating device, a pushing device and a clamping device; the electric rotating disc A is fixedly installed at the upper end of the bottom plate; the supporting plate is fixedly installed at the rotating end of the upper portion of the electric rotating disc A; the torque motor is fixedly installed at the upper end of the supporting plate; the output end of the torque motor is connected with the right end of the rotating shaft; the rotating shaft is rotatably installed on the fixing plate; the fixing plate is fixedly installed at the upper end of the supporting plate; the friction disc is fixedly installed at the left end of the rotating shaft; the heating device is installed at the left side of the upper end of the bottom plate; the supporting table is fixedly installed on the bottom plate; the pushing device is installed on the supporting table; and the pushing device is connected with the clamping device through the pressure sensor.

Description

Technical Field

[0001] This invention relates to the technical field of friction coefficient testing, and in particular to a device for testing the consistency of friction coefficient of brake pads. Background Technology

[0002] Brake pads, also known as brake linings or brake discs, are a core component of a vehicle's braking system. Brake pads are generally made of carbon, wear-resistant metals, and various other materials bonded together under high temperature and pressure. The coefficient of friction is a crucial indicator of brake pad performance; under a constant normal pressure, a higher coefficient of friction results in better braking performance.

[0003] Because vehicles can reach speeds of 150 km / h, and sometimes even 200-250 km / h, during rapid braking, the brake pads are in close contact with the brake discs. The intense friction between the brake pads and discs generates extremely high temperatures, a phenomenon commonly known as brake fade. Under high temperatures, the strength and hardness of the brake pads are affected, which in turn affects the coefficient of friction. To ensure vehicle safety during driving, brake pads must have a certain degree of heat resistance. In other words, the coefficient of friction of the brake pads at high temperatures must remain consistent with that at room temperature. Therefore, brake pads undergo a consistency test between their coefficient of friction at room temperature and at high temperatures before leaving the factory.

[0004] In the prior art, the brake pad friction coefficient detection device with patent application number "CN202210059043.1" includes a motor, a left pressure plate, a torque sensor, a temperature sensor, a pressure sensor, a right pressure plate, a left pressure plate, a worm gear reducer, a friction clutch, and a control cabinet; the temperature sensor is embedded in the left pressure plate, etc. Although it can detect the friction coefficient of brake pads, it can only detect the friction coefficient of brake pads at the same temperature, and it is inconvenient to detect the friction coefficient of brake pads at different temperatures. Its use is highly limited. Therefore, there is a need for a device that can conveniently detect the consistency of the friction coefficient of brake pads at different temperatures. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the present invention provides a brake pad friction coefficient consistency testing device that can detect the friction coefficient of brake pads at different temperatures, is easy to use, has low limitations, and is highly practical.

[0006] The brake pad friction coefficient consistency testing device of the present invention includes a base plate; it also includes an electric turntable A, a support plate, a torque motor, a rotating shaft, a fixed plate, a friction disc, a support platform, a pressure sensor, a heating device, a pushing device, and a clamping device. The electric turntable A is fixedly mounted on the upper part of the base plate, the support plate is fixedly mounted on the rotating end of the upper part of the electric turntable A, the torque motor is fixedly mounted on the upper part of the support plate, the output end of the torque motor is connected to the right end of the rotating shaft, the rotating shaft is rotatably mounted on the fixed plate, the fixed plate is fixedly mounted on the upper part of the support plate, the friction disc is fixedly mounted on the left end of the rotating shaft, the heating device is mounted on the left side of the upper part of the base plate, the support platform is fixedly mounted on the base plate, and the pushing device is mounted on the support platform. The pushing device is connected to the clamping device through the pressure sensor. When testing the consistency of the friction coefficient of brake pads, the electric turntable A first drives the support plate to rotate as shown in the appendix to the specification. Figure 2 After reaching the desired state, the torque motor outputs a certain torque force, causing the rotating shaft to drive the friction disc to rotate. The brake pads are then clamped by the clamping device. Next, the pushing device moves the pressure sensor to the left, causing the brake pads to contact the right end of the friction disc, generating friction between them. The pushing device continues to move the clamping device to the left, observing the pressure value displayed on the pressure sensor. The friction between the friction disc and the brake pads just stops the rotating shaft from rotating. The pressure value displayed on the pressure sensor is then observed. Dividing the pressure value displayed on the pressure sensor by the torque force output by the torque motor yields the coefficient of friction between the brake pads and the friction disc at room temperature. Then, the electric rotating plate A is opened again, causing it to rotate the support plate as shown in the instruction manual. Figure 1 After reaching the desired temperature, the friction disc is heated by a heating device until it reaches the required testing temperature. Then, the electric turntable A drives the support plate to rotate as shown in the instruction manual. Figure 2 By measuring the friction coefficient between the brake pad and the friction disc in the above manner, the friction coefficient of the brake pad at this temperature can be determined. By comparing the friction coefficients measured twice, the consistency of the friction coefficient of the brake pad at different temperatures can be determined. This method can detect the friction coefficient of the brake pad at different temperatures by heating the friction disc. It is convenient to use, has low limitations, and is highly practical. The friction coefficient between the brake pad and the friction disc in this invention is calculated as follows: u = F1 / F2, (u is the friction coefficient, F1 is the torque force output by the torque motor, and F2 is the pressure value displayed on the pressure sensor when the shaft just stops rotating).

[0007] Preferably, the heating device includes a lifting device, an electric turntable B, a sliding block, a connecting block A, a connecting block B, a flame gun, an infrared thermometer, and a flame heater. The flame heater is mounted on the upper part of the base plate and has an output hose connected to the flame gun. The electric turntable B is fixedly mounted on the upper part of the base plate. The lifting device is mounted on the rotating end of the electric turntable B. The sliding block is mounted on the lifting device. Connecting blocks A and B are respectively mounted on the left and right ends of the sliding block. The flame gun and the infrared thermometer are respectively fixedly mounted on connecting blocks A and B. When heating the friction disc, the electric turntable B is turned on, causing the lifting device to rotate. The lifting device rotates the flame gun to the side closer to the friction disc. Then, the flame heater is turned on, allowing the flame gun to heat up. A flame is emitted to heat the friction disc, and simultaneously, the lifting device is activated. The lifting device, via a sliding block, causes connecting block A to move the flame gun up and down. During this up-and-down movement, the flame gun evenly heats the friction disc. Then, the electric turntable B is activated again, causing the lifting device to rotate. The lifting device rotates the sliding block, which, via connecting blocks A and B, rotates the infrared thermometer to the side closest to the friction disc. Simultaneously, the sliding block, via connecting block B, causes the infrared thermometer to move up and down. During this up-and-down movement, the infrared thermometer detects the temperature of both the upper and lower parts of the friction disc until the friction disc reaches the specified detection temperature. By moving the flame gun and infrared thermometer up and down, not only is the friction disc evenly heated, but the temperature of various parts of the friction disc can also be detected, facilitating the monitoring of the friction disc's temperature.

[0008] Preferably, the lifting device includes a fixed platform, two sets of fixed rods, a support plate, a thrust bearing, a reciprocating screw, and a motor A. The fixed platform is fixedly installed on the upper end of the electric turntable B. Both sets of fixed rods are fixedly installed on the upper end of the fixed platform. The support plate is fixedly installed on the upper end of the two sets of fixed rods. The thrust bearing is fixedly installed on the upper end of the fixed platform. The reciprocating screw is rotatably installed on the thrust bearing and the support plate. The upper end of the reciprocating screw is connected to the output end of the motor A. The motor A is fixedly installed on the upper end of the support plate. The reciprocating screw is screwed onto a sliding block. Connecting block A and connecting block B are slidably installed on the two sets of fixed rods. When motor A is turned on, motor A drives the reciprocating screw to rotate. The rotating reciprocating screw causes the sliding block to drive connecting block A and connecting block B to rise and fall. This facilitates the raising and lowering of connecting block A and connecting block B.

[0009] Preferably, the pushing device includes a cylinder, a push rod, a vertical plate, and a telescopic rod. The cylinder is fixedly mounted on the upper end of the support platform. The output end of the cylinder is connected to the right end of the push rod. The push rod is slidably mounted on the vertical plate, which is fixedly mounted on the upper end of the support platform. The left end of the push rod is connected to the right end of the pressure sensor. The right ends of both sets of telescopic rods are fixedly mounted on the vertical plate, and the left ends of both sets of telescopic rods are fixedly mounted on the clamping device. When the cylinder is opened, the cylinder, through the push rod, causes the pressure sensor to drive the clamping device and the brake pad to move to the left. This facilitates applying a leftward force to the brake pad.

[0010] Preferably, the clamping device includes a clamping plate, a screw, a pressure plate, and a connecting plate. The clamping plate is fixedly installed on the left end of the pressure sensor and two sets of telescopic rods. The screw is screwed onto the upper part of the clamping plate, and the pressure plate is rotatably installed on the lower end of the screw. When clamping and fixing the brake pads, the brake pads are first glued and fixed to the clamping plate using adhesive. Then, the screw is rotated, causing the pressure plate to descend until it presses and fixes the brake pads to the clamping plate. Since the distance between the pressure plate and the brake pads can be adjusted, it can clamp and fix brake pads of different heights, has low limitations, and is easy to use.

[0011] Preferably, the connection between the rotating shaft and the friction disc is detachable. A connecting plate is provided at the left end of the rotating shaft. The connecting plate is provided with mounting holes and bolts. The friction disc is provided with threaded holes. The bolts pass through the mounting holes and are screwed into the threads on the friction disc. This configuration facilitates the disassembly and replacement of the friction disc on the rotating shaft, improving convenience.

[0012] Preferably, the connecting plate is made of heat-insulating material; through the above arrangement, the temperature of the friction disc is prevented from being transferred to the rotating shaft and torque motor sequentially through the connecting plate, thus preventing the torque motor from overheating and ensuring high reliability.

[0013] Preferably, a dust cover is provided at the upper end of the motor A; this feature reduces dust falling onto the motor A from the outside and improves the cleanliness of the motor A during use.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: by heating the friction disc, the friction coefficient of the brake pads at different temperatures can be detected, which facilitates the control of the friction disc temperature, is easy to use, has low limitations, and is highly practical. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the main structure of the present invention;

[0016] Figure 2 This is a schematic diagram of the structure of the present invention when detecting the coefficient of friction;

[0017] Figure 3 It is a structural diagram of the fixed platform, fixed rod, and support plate, etc.

[0018] Figure 4 It is a structural diagram of push rods, cylinders, and screws, etc.

[0019] The following are labels in the attached diagram: 1. Base plate; 2. Electric turntable A; 3. Support plate; 4. Torque motor; 5. Rotating shaft; 6. Fixed plate; 7. Friction disc; 8. Support platform; 9. Pressure sensor; 10. Electric turntable B; 11. Sliding block; 12. Connecting block A; 13. Connecting block B; 14. Flame gun; 15. Infrared thermometer; 16. Fixed platform; 17. Fixed rod; 18. Support plate; 19. Thrust bearing; 20. Reciprocating screw; 21. Motor A; 22. Cylinder; 23. Push rod; 24. Vertical plate; 25. Telescopic rod; 26. Clamping plate; 27. Screw; 28. Pressure plate; 29. ​​Connecting plate; 30. Bolt; 31. Brake pad. Detailed Implementation

[0020] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

[0021] like Figures 1 to 4 As shown, the electric turntable A2 is fixedly installed on the upper end of the base plate 1, the support plate 3 is fixedly installed on the rotating end of the electric turntable A2, the torque motor 4 is fixedly installed on the upper end of the support plate 3, the output end of the torque motor 4 is connected to the right end of the rotating shaft 5, the rotating shaft 5 is rotatably installed on the fixed plate 6, the fixed plate 6 is fixedly installed on the upper end of the support plate 3, the friction disc 7 is fixedly installed on the left end of the rotating shaft 5, the support platform 8 is fixedly installed on the base plate 1, the flame heater is installed on the upper end of the base plate 1, the flame heater is provided with an output hose, the flame heater is connected to the flame gun 14 through the output hose, the electric turntable B10 is fixedly installed on the upper end of the base plate 1, the lifting device is installed on the rotating end of the electric turntable B10, the sliding block 11 is installed on the lifting device, and the connection is... Connecting block A12 and connecting block B13 are respectively installed on the left and right ends of sliding block 11. Flame gun 14 and infrared thermometer 15 are respectively fixedly installed on connecting block A12 and connecting block B13. Cylinder 22 is fixedly installed on the upper end of support platform 8. The output end of cylinder 22 is connected to the right end of push rod 23. Push rod 23 is slidably installed on vertical plate 24. Vertical plate 24 is fixedly installed on the upper end of support platform 8. The left end of push rod 23 is connected to the right end of pressure sensor 9. The right ends of two sets of telescopic rods 25 are fixedly installed on vertical plate 24. Clamping plate 26 is fixedly installed on the left end of pressure sensor 9 and two sets of telescopic rods 25. Screw 27 is screwed to the upper part of clamping plate 26. Pressure plate 28 is rotatably installed on the lower end of screw 27.

[0022] The lifting device includes a fixed platform 16, two sets of fixed rods 17, a support plate 18, a thrust bearing 19, a reciprocating screw 20, and a motor A21. The fixed platform 16 is fixedly installed on the upper end of the electric turntable B10. Both sets of fixed rods 17 are fixedly installed on the upper end of the fixed platform 16. The support plate 18 is fixedly installed on the upper end of the two sets of fixed rods 17. The thrust bearing 19 is fixedly installed on the upper end of the fixed platform 16. The reciprocating screw 20 is rotatably installed on the thrust bearing 19 and the support plate 18. The upper end of the reciprocating screw 20 is connected to the output end of the motor A21. The motor A21 is fixedly installed on the upper end of the support plate 18. The reciprocating screw 20 is screwed onto the sliding block 11. The connecting block A12 and the connecting block B13 are slidably installed on the two sets of fixed rods 17 respectively.

[0023] The brake pad friction coefficient consistency testing device of the present invention, during operation, first causes the electric turntable A2 to drive the support plate 3 to rotate as shown in the attached instruction manual. Figure 2 After reaching the desired state, the torque motor 4 outputs a certain torque force, causing the rotating shaft 5 to drive the friction disc 7 to rotate. Then, the brake pad 31 is glued and fixed to the clamping plate 26. Next, the screw 27 is rotated, causing the pressure plate 28 to descend until it presses the brake pad 31 firmly onto the clamping plate 26. Then, the cylinder 22 is opened, and the cylinder 22, through the push rod 23, causes the pressure sensor 9 to move the clamping device and brake pad 31 to the left. Simultaneously, the pressure value displayed on the pressure sensor 9 is observed. The rotation of the shaft 5 stops just as the friction between the friction disc 7 and the brake pad 31 stops. At this point, the pressure value displayed on the pressure sensor 9 is observed. Dividing the pressure value displayed on the pressure sensor 9 by the torque force output by the torque motor 4 yields the coefficient of friction between the brake pad 31 and the friction disc 7 at room temperature. Then, the electric turntable A2 is opened again, causing the support plate 3 to rotate as shown in the instruction manual. Figure 1 After the initial state, the electric turntable B10 is turned on, causing the lifting device to rotate. The lifting device rotates the flame gun 14 to the side closer to the friction disc 7. Then, the flame heater is turned on, causing the flame gun 14 to emit a flame to heat the friction disc 7. Simultaneously, the lifting device is turned on, and the lifting device, through the sliding block 11, causes the connecting block A12 to move the flame gun 14 up and down. During this up-and-down movement, the flame gun 14 heats the friction disc 7 evenly. Then, the electric turntable B10 is turned on again, causing the lifting device to rotate. The lifting device rotates the sliding block 11, and the sliding block 11, through the connecting blocks A12 and B13, rotates the infrared thermometer 15 to the side closer to the friction disc 7. Simultaneously, the sliding block 11, through the connecting block B13, causes the infrared thermometer 15 to move up and down. During this up-and-down movement, the infrared thermometer 15 detects the temperature of both the upper and lower parts of the friction disc 7. Once the friction disc 7 reaches the specified detection temperature, the electric turntable A2 is turned on, causing the support plate 3 to rotate as shown in the attached instruction manual. Figure 2By measuring the friction coefficient between the brake pad 31 and the friction disc 7 in the above manner, the friction coefficient of the brake pad 31 at this temperature can be determined. By comparing the friction coefficients measured twice, it can be determined that the friction coefficient of the brake pad is consistent at different temperatures. The friction coefficient of the brake pad 31 at different temperatures can be measured by heating the friction disc 7. This method is convenient, has low limitations, and is highly practical.

[0024] In this invention, the friction coefficient between the brake pad 31 and the friction disc 7 is calculated as follows: u = F1 / F2, (u is the friction coefficient, F1 is the torque force output by the torque motor 4, and F2 is the pressure value displayed on the pressure sensor 9).

[0025] In practical operation, the present invention allows workers to draw line graphs based on the friction coefficients of brake pads 31 at different temperatures. Workers can then predict the friction coefficients of brake pads 31 at other temperatures based on the trend of the line graphs, making it convenient to use.

[0026] Since this invention can detect the coefficient of friction of brake pad 31 at different temperatures, when testing brake pad 31 used in racing cars or sports cars with high speeds, the coefficient of friction of brake pad 31 at high temperatures is detected. When testing brake pad 31 used in ordinary passenger cars, school buses, or ordinary electric cars with lower speeds, the coefficient of friction of brake pad 31 at normal temperatures is detected. Operators can choose according to actual needs, making it convenient to use.

[0027] When using the lifting device, turn on motor A21. Motor A21 drives the reciprocating screw 20 to rotate. The rotating reciprocating screw 20 causes the sliding block 11 to drive the connecting block A12 and the connecting block B13 to rise and fall.

[0028] The main functions achieved by this invention are:

[0029] 1. By heating the friction disc 7, the coefficient of friction of the brake pad 31 at different temperatures can be detected. It is convenient to use, has low limitations, and is highly practical.

[0030] 2. By moving the flame gun 14 and the infrared thermometer 15 up and down, the friction disc 7 can be heated and its temperature measured evenly, making it convenient to use.

[0031] 3. Since the friction disc 7 and the fixed plate 6 are detachable, it is convenient for staff to replace the friction disc 7.

[0032] 4. Since the height of the pressure plate 28 is adjustable, it can clamp brake pads 31 of different thicknesses, with low limitations.

[0033] 5. The staff can draw a line graph based on the friction coefficient of brake pad 31 at different temperatures. The staff can predict the friction coefficient of brake pad 31 at other temperatures based on the trend of the line graph, which is convenient to use.

[0034] The brake pad friction coefficient consistency testing device of the present invention can be installed, connected, or set in a common mechanical manner, and can be implemented as long as it can achieve its beneficial effect. The electric turntable A2, torque motor 4, pressure sensor 9, electric turntable B10, flame gun 14, infrared thermometer 15, reciprocating screw 20, telescopic rod 25, and bolts 30 of the brake pad friction coefficient consistency testing device of the present invention are all commercially available. Technical personnel in this industry only need to install and operate it according to the accompanying instruction manual, without requiring any creative work from those skilled in the art.

[0035] All technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. In the description of this invention, unless otherwise expressly specified and limited, the terms “set,” “install,” “connect,” “link,” and “fix” should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this invention will be understood according to the specific circumstances.

[0036] The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0037] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A brake pad friction coefficient consistency testing device, comprising a base plate (1); characterized in that, It also includes an electric turntable A (2), a support plate (3), a torque motor (4), a rotating shaft (5), a fixed plate (6), a friction disc (7), a support platform (8), a pressure sensor (9), a heating device, a pushing device, and a clamping device. The electric turntable A (2) is fixedly installed on the upper end of the base plate (1), the support plate (3) is fixedly installed on the rotating end of the upper part of the electric turntable A (2), the torque motor (4) is fixedly installed on the upper end of the support plate (3), the output end of the torque motor (4) is connected to the right end of the rotating shaft (5), the rotating shaft (5) is rotatably installed on the fixed plate (6), the fixed plate (6) is fixedly installed on the upper end of the support plate (3), the friction disc (7) is fixedly installed on the left end of the rotating shaft (5), the heating device is installed on the left side of the upper end of the base plate (1), the support platform (8) is fixedly installed on the base plate (1), the pushing device is installed on the support platform (8), and the pushing device is connected to the clamping device through the pressure sensor (9). The heating device includes a lifting device, an electric turntable B (10), a sliding block (11), a connecting block A (12), a connecting block B (13), a flame gun (14), an infrared thermometer (15), and a flame heater. The flame heater is installed on the upper end of the base plate (1). An output hose is provided on the flame heater. The flame heater is connected to the flame gun (14) through the output hose. The electric turntable B (10) is fixedly installed on the upper end of the base plate (1). The lifting device is installed on the rotating end of the electric turntable B (10). The sliding block (11) is installed on the lifting device. The connecting block A (12) is installed on the left end of the sliding block (11). The connecting block B (13) is installed on the right end of the sliding block (11). The flame gun (14) is fixedly installed on the connecting block A (12). The infrared thermometer (15) is fixedly installed on the connecting block B (13). The lifting device includes a fixed platform (16), two sets of fixed rods (17), a support plate (18), a thrust bearing (19), a reciprocating screw (20), and a motor A (21). The fixed platform (16) is fixedly installed on the upper end of the electric turntable B (10). Both sets of fixed rods (17) are fixedly installed on the upper end of the fixed platform (16). The support plate (18) is fixedly installed on the upper end of the two sets of fixed rods (17). The thrust bearing (19) is fixedly installed on the upper end of the fixed platform (16). The reciprocating screw (20) is fixedly installed on the upper end of the fixed platform (16). The lever (20) is rotatably mounted on the thrust bearing (19) and the support plate (18). The upper end of the reciprocating screw (20) is connected to the output end of the motor A (21). The motor A (21) is fixedly mounted on the upper end of the support plate (18). The reciprocating screw (20) is threadedly assembled with the sliding block (11). The two sets of fixed rods (17) include a left fixed rod and a right fixed rod. The connecting block A (12) is slidably mounted on the left fixed rod, and the connecting block B (13) is slidably mounted on the right fixed rod. The pushing device includes a cylinder (22), a push rod (23), a vertical plate (24), and a telescopic rod (25). The cylinder (22) is fixedly installed on the upper end of the support platform (8). The output end of the cylinder (22) is connected to the right end of the push rod (23). The push rod (23) is slidably installed on the vertical plate (24). The vertical plate (24) is fixedly installed on the upper end of the support platform (8). The left end of the push rod (23) is connected to the right end of the pressure sensor (9). The right ends of the two sets of telescopic rods (25) are fixedly installed on the vertical plate (24), and the left ends of the two sets of telescopic rods (25) are fixedly installed on the clamping device.

2. The brake pad friction coefficient consistency testing device as described in claim 1, characterized in that, The clamping device includes a clamping plate (26), a screw (27), a pressure plate (28), and a connecting plate (29). The clamping plate (26) is fixedly installed on the left end of the pressure sensor (9) and two sets of telescopic rods (25). The screw (27) is threadedly assembled with the upper part of the clamping plate (26). The pressure plate (28) is rotatably installed on the lower end of the screw (27).

3. The brake pad friction coefficient consistency testing device as described in claim 1, characterized in that, The rotating shaft (5) and the friction disk (7) are detachably connected. A connecting plate (29) is provided at the left end of the rotating shaft (5). The connecting plate (29) is provided with mounting holes and bolts (30). The friction disk (7) is provided with threaded holes. The bolts (30) pass through the mounting holes and are threadedly assembled with the threaded holes on the friction disk (7).

4. The brake pad friction coefficient consistency testing device as described in claim 3, characterized in that, The connecting plate (29) is made of heat-insulating material.

5. The brake pad friction coefficient consistency testing device as described in claim 1, characterized in that, The upper end of the motor A (21) is provided with a dust cover.

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