CN109883674B - Testing method of braking simulation testing device for disc brake of kilometer deep well elevator - Google Patents
Testing method of braking simulation testing device for disc brake of kilometer deep well elevator Download PDFInfo
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Abstract
The invention discloses a testing method of a braking simulation testing device of a disc brake of a kilometer deep well elevator, which comprises a flywheel system, a braking system and a sensing monitoring system, wherein the flywheel system comprises a frequency converter (1), a motor (2), a jaw clutch (3), a tooth type coupler (6), a rotating shaft (8) and a flywheel component; the brake system comprises a brake disc (19), a brake shoe (18), a shoe clamp (13), a shoe clamp connecting plate (20), a connecting part (15), a slide block guide rail (11), a hydraulic cylinder (21) and a hydraulic cylinder bracket (17); the sensing detection system comprises a rotating speed sensor (5), a vibration sensor (10), an infrared temperature sensor (12), a three-dimensional force sensor (14) and a positive pressure sensor (16), and the invention can test the emergency braking performance of the mine hoist disc brake and can truly simulate the actual braking condition of the mine hoist disc brake.
Description
Technical Field
The invention relates to a brake test bed of a mine hoisting disc brake, in particular to a contraction ratio test device for simulating emergency braking of a disc brake of a kilometer deep well hoist under high speed, large inertia and large specific pressure, and belongs to the technical field of mine hoist testing.
Background
At present, a mine hoist is an indispensable engineering machine in a deep resource exploration and exploitation process. The method is a junction of a mine underground production system and a ground industrial square, is a throat for mine transportation, and plays an extremely important role in the whole process of mine production. The brake device is the last safety guarantee device of the elevator, and is an indispensable important component of the elevator. Whether the braking device can work safely and effectively or not is directly related to the safe operation of the hoister, so that the production of the whole mine and the life safety of personnel are all influenced. At present, the mine hoisting speed at home and abroad is up to 16m/s, the hoisting load is up to 60t, and the hoisting height is as deep as 1000m, so that the braking working condition is very bad, and along with the large-scale, high-speed and high-yield development of mine production, the hoisting speed, the hoisting load and the hoisting height of the mine hoist are further increased, the hoisting speed is likely to reach 20m/s, and the hoisting depth is likely to reach 2000m, so that higher technical requirements are provided for implementing reliable emergency braking of the hoist. Therefore, a testing device for simulating high-speed, large-inertia and large-specific-pressure emergency braking of a disc brake of a kilometer deep well hoist is urgently needed.
The scaling experiment is an important means and similar theory for researching the braking performance and quality of the disc brake of the elevator, and shows that: if the artificially designed scaling model and the prototype model have similarity, the data of the scaling model also has reliability. Therefore, the scaling model can replace the prototype model to a certain extent, and the result of the prototype model can be analyzed and predicted through the data obtained by the scaling model.
Chinese patent document CN206960122U discloses an automobile disc brake testing device, which can set how many gripping heads according to the number of mounting holes of a brake disc, so that the brake disc clamp is suitable for various types of brake discs, however, the disc brake device is not suitable for the research of the braking performance quality of a mine hoist.
Chinese patent document CN102749205A discloses a simulation brake test bed for an automobile disc brake, which can truly simulate the operation of an automobile brake system, and an air convection device is further provided near the brake disc, however, the test bed for the disc brake is characterized in that the test bed can simulate the actual braking environment of an automobile, and has a great difference from the braking condition of a disc brake of a deep well elevator, and cannot meet the simulation of the high-speed heavy-load braking condition of the deep well elevator over kilometer.
Chinese patent document CN103345158A discloses a ventilated disc brake test bed and an electric inertia simulation control method thereof, which can increase inertia through simulation of a control motor, however, the method focuses on automatic regulation and control of flywheel inertia, mainly monitors and analyzes braking performance quality in the field of disc brakes of mine hoists, and does not need to make much research on automatic regulation and control of flywheel inertia.
Chinese patent document CN203732386U discloses a multifunctional friction material testing machine, which can be used for testing the friction and wear characteristics of brake friction materials. The testing machine can test the tribology performance of a friction material and can be used as a device for testing the tribology performance of a brake shoe material of a mine hoist, but the device cannot test the quality of the simulated braking performance of a disc brake of the mine hoist.
However, a shrinkage ratio testing device for simulating emergency braking under high speed, large inertia and large specific pressure of a disc brake of a kilometer deep well hoist has not been reported.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to research the braking performance of a disc brake of the elevator, and provides a compression ratio braking test bed capable of simulating high speed, large inertia and large braking specific pressure under the high-speed heavy-load working condition. The brake performance of the emergency brake of the mine hoist disc brake can be tested, and technical equipment is provided for the design of the mine hoist disc brake and the development of high-performance brake shoe materials.
The technical scheme is as follows: in order to achieve the purpose, the invention adopts the technical scheme that:
a braking simulation testing device for a disc brake of a kilometer deep well elevator comprises a flywheel system, a braking system and a sensing monitoring system, wherein the flywheel system comprises a frequency converter, a motor, a tooth-embedded clutch, a tooth-type coupler, a rotating shaft and a flywheel assembly. The brake system comprises a brake disc, a brake shoe clamp connecting plate, a connecting part, a sliding block guide rail, a hydraulic cylinder and a hydraulic cylinder bracket. The sensing detection system comprises a rotating speed sensor, a vibration sensor, an infrared temperature sensor, a three-dimensional force sensor and a positive pressure sensor, wherein:
the frequency converter is connected with the motor, the motor is in transmission connection with the rotating speed sensor through the jaw clutch, the rotating speed sensor is in transmission connection with one end of the rotating shaft through the inner tooth type coupling, and the other end of the rotating shaft is in transmission connection with the brake disc. The flywheel assembly is mounted on the rotating shaft.
The pneumatic cylinder passes through the pneumatic cylinder support to be fixed on the rack, slider guide rail fixed mounting is on the rack, adapting unit sets up on the slider guide rail, just adapting unit and slider guide rail sliding connection, brake shoe anchor clamps connecting plate is installed on adapting unit, the flexible end and the brake shoe anchor clamps connecting plate of pneumatic cylinder are connected, brake shoe anchor clamps are installed on brake shoe anchor clamps connecting plate, the brake shoe is installed on brake shoe anchor clamps. And the brake shoe is arranged opposite to the brake disc.
The positive pressure sensor is arranged between the brake shoe clamp connecting plate and the hydraulic cylinder. The three-dimensional force sensor is arranged between the brake shoe clamp connecting plate and the brake shoe clamp, and the vibration sensor is arranged on the brake shoe clamp.
When the telescopic end of the hydraulic cylinder is located at the first limit position, the brake shoe is in contact with the brake disc, and the brake shoe and the brake disc are located in an infrared detection area of the infrared temperature sensor. When the telescopic end of the hydraulic cylinder is at the second limit position, the brake shoe is separated from the brake disc.
Preferably: the flywheel assembly comprises a first bearing seat, a second bearing seat, a third bearing seat, a first flywheel and a second flywheel, wherein the first bearing seat, the second bearing seat and the third bearing seat are linearly distributed on the rack, the rotating shaft is respectively arranged on the first bearing seat, the second bearing seat and the third bearing seat along the axial direction, the first flywheel and the second flywheel are arranged on the rotating shaft, the first flywheel is positioned between the first bearing seat and the second bearing seat, and the second flywheel is positioned between the second bearing seat and the third bearing seat.
Preferably: the motor is a three-phase asynchronous motor.
Preferably: the infrared temperature sensor is a movable infrared temperature sensor.
A testing method of a braking simulation testing device of a disc brake of a kilometer deep well hoist is characterized in that the rotating speed of a motor is adjusted through a frequency converter, the motor drives a rotating shaft, the rotating shaft drives a flywheel I, a flywheel II and a brake disc to rotate, the flywheel I and the flywheel II are stored for a period of time to simulate the kinetic energy of the operation of the mine hoist, and meanwhile the brake disc reaches a preset initial braking speed. And the control hydraulic system regulates the brake oil pressure, controls the jaw clutch to be released while applying the brake oil pressure, and simultaneously turns off the motor. The method comprises the steps of measuring the dynamic change of the rotating speed of a brake disc in the braking process by using a rotating speed sensor, monitoring the braking pressure provided by a hydraulic cylinder by using a positive pressure sensor, monitoring the friction force of the brake shoe and the dynamic change of the positive pressure in the braking process by using a three-dimensional force sensor, monitoring the temperature change of the brake shoe and the brake disc in the braking process by using an infrared temperature sensor respectively, and monitoring the vibration signals of the brake shoe and the brake disc in the braking process by using a vibration sensor. The measured data is transmitted to a data processing system through a data acquisition system consisting of a filter, an A/D converter and an amplifier after filtering, amplifying and converting, and after data processing, the rotating speed, the friction coefficient and the temperature in the braking process, the braking positive pressure of a single braking shoe, the vibration data of the braking shoe-braking disc and the dynamic change of the vibration data along with the braking time are obtained. The wear rate is calculated after braking by measuring the average thickness of the brake shoe.
Preferably: the emergency braking of the disc brake of the mine hoist under different working conditions is simulated by adjusting the initial braking speed and the braking oil pressure.
Compared with the prior art, the invention has the following beneficial effects:
the invention can truly simulate the actual braking condition of the disk brake of the mine hoist, and can monitor the dynamic friction coefficient, temperature, braking positive pressure and change of rotating speed in the braking process by using the three-dimensional force sensor, the infrared temperature sensor, the vibration sensor, the positive pressure sensor and the rotating speed sensor.
Drawings
FIG. 1 is a schematic structural diagram of a test stand;
FIG. 2 is a schematic view of brake shoe symmetric loading;
FIG. 3 is a top view of FIG. 2;
FIG. 4 is a schematic illustration of a brake system configuration;
FIG. 5 is a schematic diagram of the operation of the present invention;
FIG. 6 is a schematic diagram of a test system according to the present invention;
in the figure: 1. a frequency converter; 2. a three-phase asynchronous motor; 3. a dog clutch; 4. a rack; 5. a rotational speed sensor; 6. a tooth coupling; 71. a first bearing seat; 72. a second bearing seat; 73. a third bearing seat; 8. a rotating shaft; 91. a first flywheel; 92. a second flywheel; 10. a vibration sensor; 11. a slider guide rail; 12. an infrared temperature sensor; 13. a brake shoe clamp; a three-dimensional force sensor; 15. a connecting member; 16. a positive pressure sensor; 17. a hydraulic cylinder bracket; 18. a brake shoe; 19. a brake disc; 20. a brake shoe clamp connecting plate; 21. and a hydraulic cylinder.
Detailed Description
The present invention is further illustrated by the following description in conjunction with the accompanying drawings and the specific embodiments, it is to be understood that these examples are given solely for the purpose of illustration and are not intended as a definition of the limits of the invention, since various equivalent modifications will occur to those skilled in the art upon reading the present invention and fall within the limits of the appended claims.
A braking simulation testing device for a disc brake of a kilometer deep well elevator is shown in figure 1 and comprises a flywheel system, a braking system and a sensing monitoring system, wherein the flywheel system comprises a frequency converter 1, a motor 2, a jaw clutch 3, a tooth coupling 6, a rotating shaft 8 and a flywheel assembly. The brake system comprises a brake disc 19, a brake shoe 18, a shoe clamp 13, a shoe clamp connecting plate 20, a connecting part 15, a slide block guide rail 11, a hydraulic cylinder 21 and a hydraulic cylinder bracket 17. The sensing detection system comprises a rotating speed sensor 5, a vibration sensor 10, an infrared temperature sensor 12, a three-dimensional force sensor 14 and a positive pressure sensor 16, wherein:
the frequency converter 1 is connected with the motor 2, the motor 2 is in transmission connection with the rotating speed sensor 5 through the jaw clutch 3, and the motor 2 is a three-phase asynchronous motor. The rotational speed sensor 5 is in transmission connection with one end of the rotating shaft 8 through the internal gear coupling 6, and the other end of the rotating shaft 8 is in transmission connection with the brake disc 19. The flywheel assembly is mounted on a rotating shaft 8.
The flywheel assembly comprises a first bearing seat 71, a second bearing seat 72, a third bearing seat 73, a first flywheel 91 and a second flywheel 92, wherein the first bearing seat 71, the second bearing seat 72 and the third bearing seat 73 are linearly distributed on the rack 4, the rotating shaft 8 is axially and respectively arranged on the first bearing seat 71, the second bearing seat 72 and the third bearing seat 73, the first flywheel 91 and the second flywheel 92 are arranged on the rotating shaft 8, the first flywheel 91 is positioned between the first bearing seat 71 and the second bearing seat 72, and the second flywheel 92 is positioned between the second bearing seat 72 and the third bearing seat 73.
As shown in fig. 2 and 3, in the test bench, a brake pressure is applied to a brake shoe clamp connecting plate 20 through a hydraulic system, a hydraulic cylinder 21 is fixed on a bench 4 through a hydraulic cylinder bracket 17, a slider guide rail 11 is fixedly installed on the bench 4, a connecting part 15 is arranged on the slider guide rail 11, the connecting part 15 is in sliding connection with the slider guide rail 11, the brake shoe clamp connecting plate 20 is installed on the connecting part 15, the telescopic end of the hydraulic cylinder 21 is connected with the brake shoe clamp connecting plate 20, the brake shoe clamp 13 is installed on the brake shoe clamp connecting plate 20, and the brake shoe 18 is installed on the brake shoe clamp 13. And the brake shoe 18 is arranged opposite the brake disc 19.
As shown in fig. 4, the positive pressure sensor 16 is installed between the shoe clamp web 20 and the hydraulic cylinder 21. The three-dimensional force sensor 14 is disposed between the brake shoe holder web 20 and the brake shoe holder 13, and the vibration sensor 10 is mounted on the brake shoe holder 13. Infrared temperature sensor 12 is portable infrared temperature sensor, and infrared temperature sensor 12 is installed on the rack through the mode of magnetism, therefore infrared temperature sensor 12 can freely magnetism inhale different positions of rack monitoring braking system, and infrared temperature sensor 12 can freely regulate and control the monitoring position. The vibration sensor 10, the three-dimensional force sensor 14, the infrared temperature sensor 12, the positive pressure sensor 16 and the rotating speed sensor 5 are connected with a computer through a data acquisition card.
When the telescopic end of the hydraulic cylinder 21 is in the first limit position, the brake shoe 18 is in contact with the brake disc 19, and the brake shoe 18 and the brake disc 19 are located in the infrared detection area of the infrared temperature sensor 12. When the telescopic end of the hydraulic cylinder 21 is in the second extreme position, the brake shoe 18 is separated from the brake disc 19.
A testing method of a braking simulation testing device of a disc brake of a kilometer deep well hoist is characterized in that as shown in fig. 4 and 5, a computer and a PLC control system are used for sending a regulation instruction to a frequency converter 1, the frequency converter 1 is used for regulating the rotating speed of a motor 2, the motor 2 is used for driving a rotating shaft 8, the rotating shaft 8 is used for driving a flywheel I91, a flywheel II 92 and a brake disc 19 to rotate, the rotating shaft is rotated for a period of time to store energy for the flywheel I91 and the flywheel II 92 so as to simulate the kinetic energy of the operation of the mine hoist, and meanwhile, the brake disc 19 can. The control hydraulic system regulates the brake oil pressure, controls the jaw clutch 3 to be released while applying the brake oil pressure, and turns off the motor 2. The method comprises the steps of measuring dynamic change of the rotating speed of a brake disc 19 in the braking process by using a rotating speed sensor 5, monitoring the braking pressure provided by a hydraulic cylinder 21 by using a positive pressure sensor 16, simultaneously monitoring the friction force of a brake shoe and the dynamic change of the positive pressure in the braking process by using a three-dimensional force sensor 14, respectively monitoring the temperature change of the brake shoe and the brake disc in the braking process by using an infrared temperature sensor 12, and monitoring the vibration signals of the brake shoe and the brake disc in the braking process by using a vibration sensor 10. As shown in fig. 5 and 6, the measured data is filtered, amplified and converted by a data acquisition system composed of a filter, an a/D converter and an amplifier and then transmitted to a data processing system, and after data processing, the rotation speed, the friction coefficient, the temperature, the brake positive pressure of a single brake shoe, the vibration data of the brake shoe and the brake disc and the dynamic change of the vibration data along with the brake time in the braking process are obtained. The wear rate is calculated after braking by measuring the average thickness of the brake shoe.
The maximum power of the three-phase asynchronous motor is 22KW, and the rotational inertia of the flywheel is 5.67Kg·m2The linear speed of 20m/s at the average friction radius can be realized, the pressure of a hydraulic system is provided by a hydraulic cylinder, the size of each brake shoe after the reduction ratio is 30mm multiplied by 50mm, and the brake specific pressure can reach 2.0 MPa. By adjusting the initial braking speed and the braking oil pressure, the emergency braking of the disc brake of the mine hoist under different working conditions can be simulated, so that the braking working condition of the disc brake of the kilometer deep well hoist can be truly simulated.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (4)
1. A testing method of a braking simulation testing device of a disc brake of a kilometer deep well elevator is characterized by comprising the following steps: the device comprises a flywheel system, a braking system and a sensing monitoring system, wherein the flywheel system comprises a frequency converter (1), a motor (2), a jaw clutch (3), a tooth type coupler (6), a rotating shaft (8) and a flywheel assembly; the brake system comprises a brake disc (19), a brake shoe (18), a shoe clamp (13), a shoe clamp connecting plate (20), a connecting part (15), a slide block guide rail (11), a hydraulic cylinder (21) and a hydraulic cylinder bracket (17); the sensing detection system comprises a rotating speed sensor (5), a vibration sensor (10), an infrared temperature sensor (12), a three-dimensional force sensor (14) and a positive pressure sensor (16), wherein:
the frequency converter (1) is connected with the motor (2), the motor (2) is in transmission connection with the rotating speed sensor (5) through the jaw clutch (3), the rotating speed sensor (5) is in transmission connection with one end of the rotating shaft (8) through the tooth-type coupler (6), and the other end of the rotating shaft (8) is in transmission connection with the brake disc (19); the flywheel assembly is arranged on the rotating shaft (8);
the flywheel assembly comprises a first bearing seat (71), a second bearing seat (72), a third bearing seat (73), a first flywheel (91) and a second flywheel (92), the first bearing seat (71), the second bearing seat (72) and the third bearing seat (73) are linearly distributed on the rack (4), the rotating shaft (8) is axially and respectively installed on the first bearing seat (71), the second bearing seat (72) and the third bearing seat (73), the first flywheel (91) and the second flywheel (92) are installed on the rotating shaft (8), the first flywheel (91) is located between the first bearing seat (71) and the second bearing seat (72), and the second flywheel (92) is located between the second bearing seat (72) and the third bearing seat (73);
the brake shoe clamp is characterized in that a hydraulic cylinder (21) is fixed on a rack (4) through a hydraulic cylinder bracket (17), a slider guide rail (11) is fixedly installed on the rack (4), a connecting part (15) is arranged on the slider guide rail (11), the connecting part (15) is in sliding connection with the slider guide rail (11), a brake shoe clamp connecting plate (20) is installed on the connecting part (15), the telescopic end of the hydraulic cylinder (21) is connected with the brake shoe clamp connecting plate (20), a brake shoe clamp (13) is installed on the brake shoe clamp connecting plate (20), and a brake shoe (18) is installed on a brake shoe clamp (13); the brake shoe (18) is arranged opposite to the brake disc (19);
the positive pressure sensor (16) is arranged between the brake shoe clamp connecting plate (20) and the hydraulic cylinder (21); the three-dimensional force sensor (14) is arranged between the brake shoe clamp connecting plate (20) and the brake shoe clamp (13), and the vibration sensor (10) is arranged on the brake shoe clamp (13);
when the telescopic end of the hydraulic cylinder (21) is at a first limit position, the brake shoe (18) is in contact with the brake disc (19), and the brake shoe (18) and the brake disc (19) are positioned in an infrared detection area of the infrared temperature sensor (12); when the telescopic end of the hydraulic cylinder (21) is at a second limit position, the brake shoe (18) is separated from the brake disc (19);
the rotating speed of the motor (2) is adjusted through the frequency converter (1), the motor (2) drives the rotating shaft (8), the rotating shaft (8) drives the flywheel I (91), the flywheel II (92) and the brake disc (19) to rotate, kinetic energy of the mine hoist in operation is simulated by storing energy for the flywheel I (91) and the flywheel II (92) after the flywheel I (91) and the flywheel II (92) rotate for a period of time, and meanwhile, the brake disc (19) is enabled to reach a preset initial braking speed; the hydraulic system is controlled to regulate the brake oil pressure, the jaw clutch (3) is controlled to be released while the brake oil pressure is applied, and the motor (2) is turned off; the method comprises the steps that a rotating speed sensor (5) is used for measuring dynamic change of a rotating speed of a brake disc (19) in the braking process, a positive pressure sensor (16) is used for monitoring braking pressure provided by a hydraulic cylinder (21), a three-dimensional force sensor (14) is used for simultaneously monitoring the friction force and the dynamic change of the positive pressure of a brake shoe in the braking process, an infrared temperature sensor (12) is used for respectively monitoring the temperature change of the brake shoe and the brake disc in the braking process, and a vibration sensor (10) is used for monitoring vibration signals of the brake shoe and the brake disc in the braking process; the measured data is transmitted to a data processing system through a data acquisition system consisting of a filter, an A/D converter and an amplifier after filtering, amplifying and converting, and after data processing, the rotating speed, the friction coefficient and the temperature in the braking process, the braking positive pressure of a single braking shoe, the vibration data of the braking shoe-braking disc and the dynamic change of the vibration data along with the braking time are obtained; the wear rate is calculated after braking by measuring the average thickness of the brake shoe.
2. The testing method of the braking simulation testing device for the disc brake of the kilometer deep well elevator, as recited in claim 1, is characterized in that: the motor (2) is a three-phase asynchronous motor.
3. The testing method of the braking simulation testing device for the disc brake of the kilometer deep well elevator, as recited in claim 2, is characterized in that: the infrared temperature sensor (12) is a mobile infrared temperature sensor.
4. The testing method of the braking simulation testing device for the disc brake of the kilometer deep well elevator is characterized in that: the emergency braking of the disc brake of the mine hoist under different working conditions is simulated by adjusting the initial braking speed and the braking oil pressure.
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| CN201910190291.8A CN109883674B (en) | 2019-03-13 | 2019-03-13 | Testing method of braking simulation testing device for disc brake of kilometer deep well elevator |
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| CN201910190291.8A CN109883674B (en) | 2019-03-13 | 2019-03-13 | Testing method of braking simulation testing device for disc brake of kilometer deep well elevator |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110243524B (en) * | 2019-07-15 | 2024-04-05 | 西南交通大学 | Triaxial force performance testing device of high-thrust superconducting linear motor |
| CN110470500B (en) * | 2019-09-18 | 2021-07-06 | 太原理工大学 | Safety brake performance test bench for mine hoist |
| CN110749428A (en) * | 2019-10-14 | 2020-02-04 | 中国矿业大学 | Hoist brake reliability test bed for simulating actual working conditions and test method thereof |
| CN111366364B (en) * | 2020-04-13 | 2021-12-24 | 中国人民解放军63921部队 | Method and device for testing performance of brake for low-speed heavy-load equipment |
| CN115901204B (en) * | 2022-11-01 | 2023-08-18 | 齐齐哈尔大学 | Elevator brake body detects tool |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100494950C (en) * | 2006-10-27 | 2009-06-03 | 武汉理工大学 | Simulating test table for disc type brake |
| CN102353528A (en) * | 2011-06-10 | 2012-02-15 | 中国矿业大学 | Tribological performance monitoring and early-warning device and method of disc brake |
| CN102323172B (en) * | 2011-06-13 | 2013-06-05 | 刘学耕 | Shrink ratio test stand for testing performance of brake material for railway train |
| CN102749205A (en) * | 2012-06-28 | 2012-10-24 | 中国矿业大学 | Simulation braking bench for automobile disc brake |
| CN105136478A (en) * | 2015-09-23 | 2015-12-09 | 中国煤炭科工集团太原研究院有限公司 | Totally-enclosed wet-type multi-disc brake performance test device |
| CN105738133A (en) * | 2016-05-04 | 2016-07-06 | 中国铁道科学研究院 | Rail vehicle multifunctional braking power testing platform |
| CN206266154U (en) * | 2016-12-12 | 2017-06-20 | 南通科诚橡塑机械有限公司 | A kind of elevator running part brake gear |
| CN109058333B (en) * | 2018-09-27 | 2020-09-04 | 中国矿业大学 | Disc brake for monitoring disc spring force in real time and monitoring method |
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