A braking material testing device

Abstract

Compared with the prior art, the present application provides a braking material testing device, which includes: a driving device, upper and lower main shafts, an explosion-proof box body, a rotational speed sensor, a calibration device, a friction torque measuring device, a pressure regulating device, and a control system; the driving device is connected to the upper main shaft, and the rotational speed sensor is arranged on the upper main shaft; the upper main shaft is arranged opposite to the lower main shaft, and a flammable gas with a preset concentration is injected into the explosion-proof box body; the calibration device, the friction torque measuring device, and the pressure regulating device are all arranged on the lower main shaft, the friction torque measuring device is used to measure the friction torque value of the test material, and the pressure regulating device is used to adjust the normal pressure between the two test materials; the driving device is communicatively connected to the control system so that the driving device adjusts the driving force acting on the upper main shaft according to the instructions of the control system. This solution can not only conduct wear resistance tests on various materials, but also measure the friction coefficient of the test material.

Description

Technical Field

[0001] This application relates to the field of mining test equipment, in particular to a braking material test equipment. Background Art

[0002] Mine hoists are generally used for underground mine operations. The underground environment is easily filled with flammable gases. For example, when the mine hoist brakes, the high temperature generated during the operation of the braking components can easily ignite the flammable gases underground, leading to safety accidents. Therefore, there are high requirements for the braking materials in the mine hoist braking equipment. When selecting braking materials, it is necessary to simulate the underground environment to measure their friction coefficients and wear tests. In the prior art, there is no such equipment specifically for end-face sliding tests. This application can test the wear resistance and measure the friction coefficients of various materials under a selected load. Summary of the Invention

[0003] An object of this application is to provide a braking material test equipment for obtaining the wear resistance test and friction coefficient measurement between various materials.

[0004] This application provides a braking material test equipment for measuring the friction coefficient and wear degree of the test material. The equipment includes:

[0005] A driving device, an upper main shaft, a lower main shaft, an explosion-proof box, a rotational speed sensor, a calibration device, a friction torque measurement device, a pressure regulating device, and a control system;

[0006] The driving device is connected to the upper main shaft to drive the upper main shaft to rotate, and the rotational speed sensor is arranged on the upper main shaft;

[0007] The upper main shaft and the lower main shaft are arranged opposite to each other. When the test material is placed on the lower surface of the upper main shaft and the upper surface of the lower main shaft, both test materials are placed in the explosion-proof box and are in contact with each other and generate friction due to the rotation of the upper main shaft. A flammable gas with a preset concentration is injected into the explosion-proof box;

[0008] The calibration device, the friction torque measurement device, and the pressure regulating device are all arranged on the lower main shaft. The calibration device is used to calibrate the friction torque value measured by the friction torque measurement device before the test. The friction torque measurement device is used to measure the friction torque value of the test material, and the pressure regulating device is used to adjust the normal pressure between the two test materials;

[0009] The driving device is communicatively connected to the control system so that the driving device adjusts the driving force acting on the upper main shaft according to the instructions of the control system.

[0010] Preferably, the driving device includes:

[0011] Motor, first gear, second gear, transmission rod;

[0012] The transmission rod is provided with a first gear belt, and the motor is connected to the first gear belt of the transmission rod through the first gear. When the motor operates, the transmission rod is driven to rotate through the cooperation of the first gear and the first gear belt;

[0013] The transmission rod is provided with a second gear belt, and the upper main shaft is connected to the second gear belt of the transmission rod through the second gear. When the transmission rod rotates, the upper main shaft is driven to rotate through the cooperation of the second gear belt and the second gear.

[0014] Preferably, the calibration device includes:

[0015] String pulley, string, fixed pulley, first load;

[0016] The string pulley is arranged on the lower main shaft, the string is wound on the string pulley, and the first load is suspended through the fixed pulley fixed on the explosion-proof box body.

[0017] Preferably, the lower main shaft includes:

[0018] Shaft shell, shaft core;

[0019] The shaft core is sleeved in the shaft shell and is movably connected to the shaft shell, so that the shaft core drives the test material placed on the lower main shaft to move along the axial direction;

[0020] The pressure regulating device includes:

[0021] Balance rod, second load, support part;

[0022] The support part is fixedly connected to the explosion-proof box body, the balance rod is provided with a balance part and is placed on the support part through the balance part. One end of the balance rod hangs the second load, and the other end is movably connected to the shaft core. When the second load presses down one end of the balance rod, the balance rod presses up the other end through the balance part, so that the test material placed on the lower main shaft is pressed along the axial direction towards the test material placed on the upper main shaft.

[0023] Preferably, the device further includes:

[0024] Exhaust device, and the exhaust device is an opening on the side wall of the explosion-proof box body that communicates the internal and external spaces of the box body.

[0025] Preferably, the exhaust device further includes:

[0026] An isolation part that isolates the internal and external spaces of the explosion-proof box body to seal the flammable gas inside the explosion-proof box body. When the flammable gas inside the explosion-proof box body explodes, the expanded gas inside the explosion-proof box body breaks through the isolation part and is discharged from the explosion-proof box body.

[0027] Preferably, the device further includes:

[0028] A vacuum pump connected to the exhaust device to extract part of the air inside the explosion-proof box body.

[0029] Preferably, the explosion-proof box body further includes:

[0030] An air inlet device for injecting the flammable gas into the explosion-proof box body.

[0031] Preferably, the device further includes:

[0032] A temperature sensor disposed on the upper main shaft or the lower main shaft for measuring the temperature change during the friction of the test material.

[0033] Preferably, the flammable gas is methane.

[0034] Compared with the prior art, the present application provides a braking material testing device for determining the wear resistance and friction coefficient of a test material. The device includes: a driving device, an upper main shaft, a lower main shaft, an explosion-proof box body, a rotational speed sensor, a calibration device, a friction torque measuring device, a pressure regulating device, and a control system. The driving device is connected to the upper main shaft to drive the upper main shaft to rotate, and the rotational speed sensor is disposed on the upper main shaft. The upper main shaft and the lower main shaft are oppositely arranged so that when the test material is placed on the lower surface of the upper main shaft and the upper surface of the lower main shaft, both test materials are placed inside the explosion-proof box body and are in contact with each other and generate friction due to the rotation of the upper main shaft. A flammable gas with a preset concentration is injected into the explosion-proof box body. The calibration device, the friction torque measuring device, and the pressure regulating device are all disposed on the lower main shaft. The calibration device is used to calibrate the friction torque value measured by the friction torque measuring device before the test. The friction torque measuring device is used to measure the friction torque value of the test material. The pressure regulating device is used to adjust the normal pressure between the two test materials. The driving device is communicatively connected to the control system so that the driving device adjusts the driving force acting on the upper main shaft according to the instructions of the control system. This solution can not only perform wear resistance tests on various materials but also determine the friction coefficient of the test material. Description of the Drawings

[0035] By reading the detailed description of the non-limiting embodiments with reference to the following drawings, other features, objects, and advantages of the present application will become more apparent:

[0036] Figure 1 Schematic diagram of one embodiment of the device described in the present application;

[0037] Figure 2 Partial enlarged view of the side perspective of the device described in the present application;

[0038] Figure 3 Cross-sectional schematic diagram of the lower spindle of the device described in the present application;

[0039] Identical or similar reference numerals in the drawings represent identical or similar components. Detailed implementation manners

[0040] The present application provides a braking material testing device for measuring the friction coefficient and wear degree of a test material. The device includes:

[0041] A driving device, an upper spindle, a lower spindle, an explosion-proof box body, a rotational speed sensor, a calibration device, a friction torque measuring device, a pressure regulating device, and a control system;

[0042] The driving device is connected to the upper spindle to drive the upper spindle to rotate, and the rotational speed sensor is arranged on the upper spindle;

[0043] The upper spindle and the lower spindle are arranged opposite to each other so that when the test materials are placed on the lower surface of the upper spindle and the upper surface of the lower spindle, both test materials are placed in the explosion-proof box body and are in contact with each other and generate friction due to the rotation of the upper spindle. A flammable gas with a preset concentration is injected into the explosion-proof box body;

[0044] The calibration device, the friction torque measuring device, and the pressure regulating device are all arranged on the lower spindle. The calibration device is used to calibrate the friction torque value measured by the friction torque measuring device before the test. The friction torque measuring device is used to measure the friction torque value of the test material, and the pressure regulating device is used to adjust the normal pressure between the two test materials;

[0045] The driving device is communicatively connected to the control system so that the driving device adjusts the driving force acting on the upper spindle according to the instructions of the control system.

[0046] Next, in combination with Figure 1 、 Figure 2 and Figure 3 The above device of the present application will be further described.

[0047] The upper main shaft 2 can be a cylindrical object. The driving device 1 is placed at one end of the upper main shaft 2 to drive the upper main shaft 2 to rotate. The other end of the upper main shaft 2 places the test material, that is, the test material is placed on the lower surface of the upper main shaft 2. The lower main shaft 3 is placed opposite to the upper main shaft 2. Another test material is placed on the upper surface of the lower main shaft 3. When the upper main shaft 2 or the lower main shaft 3 is subjected to forces in opposite directions, the two test materials come into contact and form a normal pressure. When the upper main shaft 2 rotates driven by the driving device 1, the lower main shaft 3 remains stationary. At this time, friction can be generated between the two materials, so as to measure the wear degree of the test material.

[0048] The two test materials can be placed in an explosion-proof box body filled with a combustible gas at a preset concentration to simulate the underground environment. When the two test materials generate friction, their temperature rises. When the temperature reaches the ignition point of the flammable gas, the flammable gas is ignited.

[0049] When the lower main shaft 3 can rotate freely, the friction coefficient of the test material can be measured by the calibration device 6 and the friction torque measuring device 4. The pressure regulating device 5 can change the magnitude of the normal pressure between the two test materials according to the actual test situation, so as to meet different measurement requirements.

[0050] The control system can also add other additional functions. For example, it is controlled by a PLC (Programmable Logic Controller). The system can also add functions of curve recording and data processing to realize the measurement display and data processing of various parameters, such as time, friction torque curve, time, friction coefficient curve, and time, temperature curve, etc. The measurement data can be automatically saved and replayed. The test data can be saved in real time, the measurement data, test report and curve can be output and printed, and text can be provided. The system can also add components for displaying parameters such as normal pressure, maximum friction torque, maximum friction coefficient, average friction torque, average friction coefficient, temperature, rotation speed, and time.

[0051] In some embodiments of the present application, the driving device 1 includes a motor 11, a first gear, a second gear, and a transmission rod 12. The transmission rod is provided with a first gear belt 121. The motor is connected to the first gear belt 121 of the transmission rod 12 through the first gear. When the motor 11 operates, the transmission rod 12 is driven to rotate through the cooperation of the first gear and the first gear belt 121. The transmission rod 12 is provided with a second gear belt 122. The upper main shaft 2 is connected to the second gear belt 122 of the transmission rod 12 through the second gear. When the transmission rod 12 rotates, the upper main shaft 2 is driven to rotate through the cooperation of the second gear belt 122 and the second gear.

[0052] The driving device 1 can be driven by a motor 11. The transmission device uses a first gear, a second gear, and a transmission rod 12 with gear belts 121 and 122 for transmission. In the driving devices of some other equipment, belts are used for transmission. In this way, during testing, the accuracy of the test will be affected due to belt slippage. This solution uses a hard connection method for transmission, avoiding the reduction of power output caused by belt slippage of the driving device 1 and affecting the accuracy of the experiment.

[0053] In some embodiments of the present application, the calibration device includes: a string pulley 61, a string 62, a fixed pulley 63, and a first load 64; the string pulley 61 is arranged on the lower main shaft 3, the string 62 is wound around the string pulley 61, and the first load is suspended through the fixed pulley 63 fixed on the explosion-proof box body.

[0054] The calibration device 6 is used to calibrate the frictional torque before the test starts. After the string 62 is loaded with the first load 64, a pulling force is generated on the lower main shaft 3. Due to the influence of this pulling force, the lower main shaft 3 exerts a force on the frictional torque measuring device 4, so that the frictional torque measuring device 4 displays the frictional torque value.

[0055] The frictional torque value is calculated through the mass of the first load 64 and the radius of the string pulley 61. The calculated frictional torque value should be consistent or have a very small error with the frictional torque value displayed by the frictional torque measuring device 4. The calculation formula is M = P × L, where P is the mass of the first load 64 and L is the radius of the string pulley 61. Then, according to Coulomb's law, μ = F / N, where μ is the friction coefficient, F is the frictional force, and N is the normal pressure value between the two test materials. μ = M / R × N, where M is the frictional torque value and R is the friction radius of the test material.

[0056] In some embodiments of the present application, the lower main shaft includes a shaft shell 31 and a shaft core 32; the shaft core 32 is sleeved inside the shaft shell 31 and is movably connected to the shaft shell 32, so that the shaft core 32 drives the test material placed on the lower main shaft 3 to move along the axial direction;

[0057] The pressure adjusting device 5 includes a balance rod 51, a second load 52, and a support portion 54; the support portion 54 is fixedly connected to the explosion-proof box body. The balance rod 51 is provided with a balance portion 53 and is placed on the support portion 54 through the balance portion 53. One end of the balance rod 51 is loaded with the second load 52, and the other end is movably connected to the shaft core 32. When the second load 52 presses down one end of the balance rod 51, the balance rod 51 presses up the other end through the balance portion 53, so that the test material placed on the lower main shaft 3 is pressed along the axial direction against the test material placed on the upper main shaft 2.

[0058] As Figure 2 and Figure 3 shown, a pressure regulating device 5 is provided on the lower main shaft 3. The shaft housing 31 and the shaft center 32 of the lower main shaft 3 can adopt an irregular structure for nesting, so that the shaft core 32 can move along the axial direction and prevent the shaft core 32 from rotating around the axis relative to the shaft housing 31. The pressure regulating device 5 is used to regulate the normal pressure between the two test materials. This device adopts the lever principle and can regulate the normal pressure by changing the mass of the second load 52 or adjusting the lever ratio. That is, adjust the position of the supporting part 53 on the balance lever 51 to increase or shorten the lever arms of the downward pressure and the upward pressure of the balance lever 51.

[0059] In some embodiments of the present application, the device further includes an exhaust device 7, and the exhaust device 7 is an opening on the side wall of the explosion-proof box body that communicates the internal and external spaces of the box body.

[0060] The exhaust device 7 is used to exclude the expanded air through the exhaust device 7 when the flammable gas is ignited due to the increase in the temperature of the test material, so as to prevent damage to the devices inside the explosion-proof box body.

[0061] In some embodiments of the present application, the exhaust device further includes a partition 71. The partition 71 isolates the internal and external spaces of the explosion-proof box body to seal the flammable gas inside the explosion-proof box body. When the flammable gas inside the explosion-proof box body explodes, the expanded gas inside the explosion-proof box body breaks through the partition 71 and is discharged from the explosion-proof box body.

[0062] Preferably, the partition can be a layer of plastic film to isolate the air flow between the inside and outside of the explosion-proof box body.

[0063] In some embodiments of the present application, the device further includes a vacuum pump, and the vacuum pump is connected to the exhaust device to extract part of the air inside the explosion-proof box body.

[0064] When injecting flammable gas, the air inside the explosion-proof box body can be discharged first, or the air can be discharged and the flammable gas can be injected simultaneously.

[0065] In some embodiments of the present application, the explosion-proof box body further includes an air inlet device 7, and the air inlet device 7 is used to inject the flammable gas into the explosion-proof box body.

[0066] In some embodiments of the present application, the device further includes a temperature sensor 8. The temperature sensor 8 is arranged on the upper main shaft 2 or the lower main shaft 3 and is used to measure the temperature change during the friction of the test material.

[0067] The temperature sensor 8 can be communicatively connected to the control system to monitor the temperature during the friction of the test material.

[0068] In some embodiments of the present application, the flammable gas is methane.

[0069] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalent technologies, this application is also intended to include these modifications and variations.

[0070] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be construed as limiting the claimed claim. In addition, it is obvious that the word "comprising" does not exclude other units or steps, and the singular does not exclude the plural. The multiple units or devices stated in the apparatus claims can also be implemented by one unit or device through software or hardware. The words first, second, etc. are used to denote names and do not denote any particular order.

Claims

1. A braking material testing device for measuring the friction coefficient and wear degree of a test material, Characterized in that, The device includes: A driving device, an upper main shaft, a lower main shaft, an explosion-proof box, a rotational speed sensor, a calibration device, a friction torque measuring device, a pressure regulating device, and a control system; The driving device is connected to the upper main shaft to drive the upper main shaft to rotate, and the rotational speed sensor is arranged on the upper main shaft; The upper main shaft and the lower main shaft are arranged opposite to each other, so that when the test material is placed on the lower surface of the upper main shaft and the upper surface of the lower main shaft, both test materials are placed in the explosion-proof box and are in contact with each other and generate friction due to the rotation of the upper main shaft, and a flammable gas with a preset concentration is injected into the explosion-proof box; The calibration device, the friction torque measuring device, and the pressure regulating device are all arranged on the lower main shaft. The calibration device is used to calibrate the friction torque value measured by the friction torque measuring device before the test. The friction torque measuring device is used to measure the friction torque value of the test material, and the pressure regulating device is used to adjust the normal pressure between the two test materials; The driving device is communicatively connected to the control system, so that the driving device adjusts the driving force acting on the upper main shaft according to the instructions of the control system; Wherein, the driving device includes: A motor, a first gear, a second gear, and a transmission rod; The transmission rod is provided with a first gear belt, and the motor is connected to the first gear belt of the transmission rod through the first gear. When the motor operates, the transmission rod is driven to rotate through the cooperation of the first gear and the first gear belt; The transmission rod is provided with a second gear belt, and the upper main shaft is connected to the second gear belt of the transmission rod through the second gear. When the transmission rod rotates, the upper main shaft is driven to rotate through the cooperation of the second gear belt and the second gear; The calibration device includes: A chord wheel, a chord, a fixed pulley, and a first load; The chord wheel is arranged on the lower main shaft, the chord is wound around the chord wheel, and the first load is suspended through the fixed pulley fixed on the explosion-proof box; The lower main shaft includes: A shaft shell and a shaft core; The shaft core is sleeved in the shaft shell and is movably connected to the shaft shell, so that the shaft core drives the test material placed on the lower main shaft to move along the axial direction; The pressure regulating device includes: A balance rod, a second load, and a support part; The support part is fixedly connected to the explosion-proof box. The balance rod is provided with a balance part and is placed on the support part through the balance part. One end of the balance rod hangs the second load, and the other end is movably connected to the shaft core. When the second load presses down one end of the balance rod, the balance rod presses up the other end through the balance part, so that the test material placed on the lower main shaft is pressed against the test material placed on the upper main shaft along the axial direction.

2. The device according to claim 1, Characterized in that, The device further includes: An exhaust device, and the exhaust device is an opening on the side wall of the explosion-proof box that communicates the internal and external spaces of the box.

3. The device according to claim 2, wherein, the exhaust device further comprises: an isolation part, which isolates the internal and external spaces of the explosion-proof box body, is used for sealing the flammable gas in the explosion-proof box body, and when the flammable gas in the explosion-proof box body explodes, the expanded gas in the explosion-proof box body breaks through the isolation part and is discharged from the explosion-proof box body.

4. The device according to claim 2, wherein, the device further comprises: a vacuum pump, which is connected to the exhaust device and is used for pumping out part of the air in the explosion-proof box body.

5. The device according to claim 1, wherein, the explosion-proof box body further comprises: an air inlet device, which is used for injecting the flammable gas into the explosion-proof box body.

6. The device according to claim 1, wherein, the device further comprises: a temperature sensor, which is arranged on the upper main shaft or the lower main shaft and is used for measuring the temperature change during the friction of the test material.

7. The device according to claim 1, wherein, the flammable gas is methane.

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