A disc brake for monitoring braking positive pressure by a cylindrical sensor and a monitoring method

Abstract

A disc brake for monitoring the braking positive pressure by a cylindrical sensor and a monitoring method. The braking positive pressure sensor is composed of a base, a boss and a cylinder. During braking, the brake disc exerts a braking positive pressure F1 on the brake shoe, which acts on the base through the brake shoe. The cylinder body exerts a pressure F2 on the boss. The cylinder between the base and the boss undergoes compressive deformation under the action of F1 and F2, and F1 = -F2. The deformation amount is proportional to the braking positive pressure F1. A pressure strain gauge is attached to the outer cylindrical surface of the cylinder to monitor the braking positive pressure F1. According to the braking positive pressure F1, faults can be diagnosed and control instructions can be given: Before starting the vehicle, if it is equal to zero, starting the vehicle is allowed; if it is not equal to zero, it is diagnosed that the brake cannot be opened and the current start is locked. During operation, if it is not equal to zero, it is diagnosed that the brake application fault and the safety braking is enabled. During braking, if it is greater than or equal to the allowable value of the braking positive pressure, the next start is allowed; if it is less than the allowable value of the braking positive pressure, it is diagnosed that the braking positive pressure is insufficient and the next start is locked.

Description

Technical Field

[0001] The present invention relates to a disc brake for monitoring braking positive pressure and a monitoring method, in particular to a disc brake for monitoring braking positive pressure with a cylindrical sensor applicable to a mine hoist and a monitoring method thereof. Background Art

[0002] The braking positive pressure sensor should monitor the braking positive pressure when the brake shoe presses on the brake disc, and this braking positive pressure should not be affected by the frictional force. Patent No. ZL20071025205.5 discloses a "disc brake for monitoring braking positive pressure in a braking state". In this disc brake in the braking state, a pressure strain gauge is attached to the connecting bolt. The monitored pressure is not the braking positive pressure, but the sum of the braking positive pressure applied by the brake shoe to the brake disc and the frictional force between the brake seat hole and the brake shoe shaft. During the use of the disc brake for monitoring braking positive pressure in the braking state, there has been a situation where the space between the brake seat hole and the brake shoe shaft was filled with sludge. As a result, in the braking state, the frictional force between the brake seat hole and the brake shoe shaft was equal to the disc spring force generated by the disc spring, which could not push the brake shoe to move. The brake shoe did not press on the brake disc, and the braking positive pressure applied by the brake shoe to the brake disc was zero, leading to a major accident of the dropping skip. The reason for not detecting that the braking positive pressure was zero was that the pressure strain gauge attached to the connecting bolt monitored the frictional force between the brake seat hole and the brake shoe shaft, so it was wrongly considered equal to the braking positive pressure, and the serious fault of zero braking positive pressure was not diagnosed. Summary of the Invention

[0003] Technical Problem: The purpose of the present invention is to overcome the deficiencies in the prior art and provide a brake that uses a cylindrical sensor to monitor the braking positive pressure when the brake shoe presses on the brake disc.

[0004] Technical Solution: The disc brake for monitoring braking positive pressure with a cylindrical sensor of the present invention mainly consists of a brake disc, a brake shoe, a braking positive pressure sensor, a cylinder body, a disc spring group, key one, key two, a brake seat, a hydraulic cylinder, seal ring one, a piston, an adjusting screw, a nut, seal ring two, and a rear cover. The braking positive pressure sensor is connected to the brake shoe to monitor the braking positive pressure F applied by the brake disc to the brake shoe 1 ; the braking positive pressure sensor consists of a base, a boss, and a cylinder, with a cross-section in the shape of a Chinese character 'tu'. The right end of the base is connected to the brake shoe in the form of a dovetail groove to bear the braking positive pressure F exerted by the brake disc on the brake shoe 1 , the boss passes through the inner hole of the cylinder body, and there is a key two between the static fit of the boss and the inner hole of the cylinder body. The boss supports the bottom of the inner hole of the cylinder body to bear the resultant force F of the disc spring force, frictional force, and oil pressure applied by the bottom of the inner hole of the cylinder body 2, there is a gap △ between the bottom end face of the cylinder body and the left end face of the base of the braking positive pressure sensor. The cylinder body has a clearance fit with the hole of the brake seat and is provided with a key 1. One end of the cylinder of the braking positive pressure sensor passes through the piston and is fixed by a nut. Pressure strain gauges are pasted on the cylindrical surface between the base of the braking positive pressure sensor and the boss, and the strain signal is led out by a signal wire. The braking positive pressure F is monitored through the strain gauges. 1 .

[0005] The gap △ between the bottom end face of the cylinder body and the base of the braking positive pressure sensor is 2 mm.

[0006] There are 2 - 4 pressure strain gauges pasted on the cylindrical surface between the chassis of the braking positive pressure sensor and the boss.

[0007] The method for monitoring the braking positive pressure by the braking positive pressure sensor takes the braking positive pressure applied by the monitoring brake shoe to the brake disc as the basis for diagnosing faults and giving control instructions. The process is as follows:

[0008] When the disc brake brakes: the brake disc applies a braking positive pressure F to the brake shoe. 1 , the braking positive pressure F 1 acts on the base of the braking positive pressure sensor through the brake shoe, and the cylinder body applies a pressure F to the boss of the braking positive pressure sensor. 2 , the cylinder between the base and the boss of the braking positive pressure sensor is subjected to the braking positive pressure F 1 and the pressure F applied by the cylinder body. 2 The two forces act on it, and the two forces are equal in magnitude and opposite in direction, that is, F 1 =-F 2 , the cylinder between the base and the boss undergoes a compressive deformation under the action of F 1 and F 2 , and the deformation amount is proportional to the braking positive pressure F 1 .

[0009] During the opening process: The disc brake is in the closing and braking state. The oil pressure acting on the piston overcomes the disc spring force generated by the compression deformation of the disc spring group, and the sum of the frictional forces acting on the cylinder body and the piston jointly by the disc spring group, the brake seat, the hydraulic cylinder, the first sealing ring, the rear cover, and the second sealing ring compresses the disc spring group further, causing the brake shoe to move left and leave the brake disc, and maintaining a brake gap less than 2 mm adjusted by the adjusting screw.

[0010] During the pre - driving monitoring process: The braking positive pressure F is monitored through the braking positive pressure sensor. 1 , if the braking positive pressure F 1 =0, it indicates no fault, and driving is allowed; if the braking positive pressure F 1 ≠0, it diagnoses the fault that the brake cannot be opened, and driving is not allowed. Driving is only allowed after the fault is eliminated.

[0011] After monitoring for no faults, during the driving process with the brake open, the hoist is driven with the brake disc rotating, and at the same time, the brake positive pressure sensor monitors the brake positive pressure F. 1 When the brake positive pressure F 1 ≠0, diagnose the brake application failure, give an alarm in time and activate the safety brake. After eliminating the fault, driving is allowed again.

[0012] During the braking process, the hydraulic oil pressure is unloaded to the residual pressure, and the residual pressure value is less than 0.5 MPa. The force of the disc spring overcomes the oil pressure acting on the piston, and the combined friction force of the disc spring group, brake seat, hydraulic cylinder, and two seals (seal one and seal two at the rear cover) acting on the cylinder body and the piston together pushes the brake shoe to move rightward to press against the brake disc, realizing closing and braking.

[0013] During the monitoring process before reopening the brake after braking, the brake positive pressure sensor monitors the brake positive pressure F. 1 If the brake positive pressure F 1 is greater than or equal to the allowable value of the brake positive pressure, the next driving is allowed; if the brake positive pressure F 1 is less than the allowable value of the brake positive pressure, diagnose the insufficient brake positive pressure fault, then give an alarm and lock the next driving. After eliminating the potential fault, reopen the brake.

[0014] Repeat the above process to complete real-time monitoring of the brake positive pressure to achieve reliable operation of the disc brake.

[0015] Beneficial effects: Due to the above technical solution, the present invention uses the brake positive pressure applied by the brake shoe to the brake disc monitored as the basis for diagnosing faults and giving control instructions: Before driving, if it is equal to zero, driving is allowed; if it is not equal to zero, diagnose the fault that the brake cannot be opened and lock the current driving; during operation, if it is not equal to zero, diagnose the brake application failure and activate the safety brake; during braking, if it is greater than or equal to the allowable value of the brake positive pressure, the next driving is allowed; if it is less than the allowable value of the brake positive pressure, diagnose the insufficient brake positive pressure fault and lock the next driving. This greatly improves the braking effect of the disc brake of the hoist. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is the closing and braking state of the disc brake with the cylindrical sensor of the present invention monitoring the brake positive pressure.

[0017] Figure 2 is the opening and driving state of the disc brake with the cylindrical sensor of the present invention monitoring the brake positive pressure.

[0018] In the figure: 1 - brake disc; 2 - brake shoe; 3 - brake positive pressure sensor; 3-1 - pressure strain gauge; 3-2 - signal wire; 4 - cylinder body; 5 - disc spring group; 6 - key 1; 7 - key 2; 8 - brake seat; 9 - hydraulic cylinder; 10 - seal ring 1; 11 - piston; 12 - adjusting screw; 13 - nut; 14 - seal ring 2; 15 - rear cover. Specific embodiments

[0019] The present invention will be further described below in conjunction with the embodiments in the accompanying drawings:

[0020] The disc brake of the present invention for monitoring the brake positive pressure by a cylindrical sensor mainly consists of a brake disc 1, a brake shoe 2, a brake positive pressure sensor 3, a cylinder body 4, a disc spring group 5, a key 1 6, a key 2 7, a brake seat 8, a hydraulic cylinder 9, a seal ring 1 10, a piston 11, an adjusting screw 12, a nut 13, a seal ring 2 14 and a rear cover 15. The brake positive pressure sensor 3 is connected to the brake shoe 2 to monitor the brake positive pressure F applied by the brake disc 1 to the brake shoe 2. 1 ; The brake positive pressure sensor 3 is composed of a base, a boss and a cylinder, and its cross-section is in the shape of the Chinese character 'tu'. There are 2-4 pressure strain gauges 3-1 pasted on the cylindrical surface between the chassis and the boss of the brake positive pressure sensor 3. The right end of the base is connected to the brake shoe 2 in the form of a dovetail groove to bear the brake positive pressure F exerted by the brake disc 1 on the brake shoe 2. 1 The boss passes through the inner hole of the cylinder body 4. A key 2 7 is provided between the boss and the inner hole of the cylinder body 4 with a static fit. The boss supports the bottom of the inner hole of the cylinder body 4 and bears the resultant force F of the disc spring force, frictional force and oil pressure applied by the bottom of the inner hole of the cylinder body 4. 2 A gap △ is left between the bottom end face of the cylinder body 4 and the left end face of the base of the brake positive pressure sensor 3, and the gap △ is 2 mm. The cylinder body 4 has a moving fit with the hole of the brake seat 8, and a key 1 6 is provided; one end of the cylinder of the brake positive pressure sensor 3 passes through the piston 11 and is fixed by a nut 13; pressure strain gauges 3-1 are pasted on the cylindrical surface between the base and the boss of the brake positive pressure sensor 3, and the strain signal is led out by a signal wire 3-2, and the brake positive pressure F is monitored through the pressure strain gauges 3-1. 1 .

[0021] The method for monitoring the brake positive pressure by the brake positive pressure sensor of the present invention uses the monitored brake positive pressure applied by the brake shoe to the brake disc as the basis for diagnosing faults and giving control instructions. The specific process is as follows:

[0022] When the disc brake brakes: As Figure 1 shown, the disc brake is in the closing and braking state, and the brake disc 1 applies a brake positive pressure F to the brake shoe 2. 1 The brake positive pressure F 1Acting on the base of the brake positive pressure sensor 3 through the brake shoe 2, the cylinder body 4 applies a pressure F to the boss of the brake positive pressure sensor 3 2 , and a brake positive pressure F is exerted on the cylinder between the base and the boss of the brake positive pressure sensor 3 1 and the cylinder body 4 applies a pressure F 2 The two forces act, and the two forces are equal in magnitude and opposite in direction, that is, F 1 =-F 2 , and the cylinder between the base and the boss is compressed and deformed under the action of F 1 and F 2 , and the deformation amount is proportional to the brake positive pressure F 1 ;

[0023] Brake release process: As shown in the figure, the disc brake is in the closed brake state. The oil pressure acting on the piston 11 overcomes the disc spring force generated by the compression deformation of the disc spring group 5, and the sum of the frictional forces acting on the cylinder body 4 and the piston 11 by the disc spring group 5, the brake seat 8, the hydraulic cylinder 9 and the first sealing ring 10, the rear cover 15 and the second sealing ring 14 compresses the disc spring group 5 further, causing the brake shoe 2 to move left and leave the brake disc 1, and maintaining a brake gap of less than 2 mm set by the adjusting screw 12 as shown in the figure Figure 1 ; Figure 2 ;

[0024] Monitoring process before starting: Monitor the brake positive pressure F through the brake positive pressure sensor 3 1 , and judge whether it is possible to start according to whether the brake positive pressure F 1 is 0: If the brake positive pressure F 1 =0, it indicates no fault, and starting is allowed; if the brake positive pressure F 1 ≠0, diagnose the fault that the brake cannot be opened, then alarm and lock out the current start, and starting is only allowed after the fault is eliminated;

[0025] After monitoring no fault, as shown in the figure, maintain the brake release and starting state. The brake disc 1 rotates to start the hoist, and at the same time, the brake positive pressure sensor 3 monitors the brake positive pressure F Figure 2 , when the brake positive pressure F 1 ≠0, diagnose the brake application fault, alarm in time and activate the safety brake, and starting is allowed again after the fault is eliminated; 1 ;

[0026] Braking process, as shown in the figure, maintain the brake release and starting state, unload the hydraulic oil pressure to the residual pressure, and the residual pressure value is less than 0.5 MPa. The disc spring force overcomes the oil pressure acting on the piston 11, and the sum of the frictional forces acting on the cylinder body 4 and the piston 11 by the disc spring group 5, the brake seat 8, the hydraulic cylinder 9 and the first sealing ring 10, the rear cover 15 and the second sealing ring 14 pushes the brake shoe 2 to move right and press against the brake disc 1 to achieve the closed brake state as shown in the figure Figure 2 ; Figure 1 ;

[0027] Monitoring process before re - releasing the brake after braking is completed. The brake positive pressure sensor 3 monitors the brake positive pressure F 1 , if the brake positive pressure F 1 is greater than or equal to the allowable value of the brake positive pressure, the next start is allowed; if the brake positive pressure F 1 is less than the allowable value of the brake positive pressure, a fault of insufficient brake positive pressure is diagnosed, then an alarm is given and the next start is blocked. After eliminating the potential fault, the brake is released again;

[0028] The above process is cycled to complete real - time monitoring of the brake positive pressure to achieve reliable operation of the disc brake.

Claims

1. A method for monitoring a disc brake using a cylindrical sensor to monitor brake positive pressure, comprising using a disc brake, wherein the disc brake comprises a brake disc (1), a brake shoe (2), a brake positive pressure sensor (3), a cylinder (4), a disc spring assembly (5), a brake seat (8), a hydraulic cylinder (9), a sealing ring (10), a piston (11), an adjusting screw (12), a sealing ring (14) and a rear cover (15), Features: The positive braking pressure applied by the brake shoe to the brake disc is used as the basis for diagnosing faults and giving control instructions. Real-time monitoring of the positive braking pressure ensures reliable operation of the disc brake. The specific process is as follows: When the disc brake is braking: the brake disc (1) applies a braking normal pressure to the brake shoe (2). F 1 , the braking normal pressure F 1 acts on the base of the braking normal pressure sensor (3) through the brake shoe (2), and the cylinder body (4) applies a pressure to the boss of the braking normal pressure sensor (3). F 2 , the cylinder between the base and the boss of the braking normal pressure sensor (3) is subjected to the braking normal pressure F 1 and the pressure applied by the cylinder body (4). F 2 The two forces act, and the two forces are equal in magnitude and opposite in direction, that is F 1 = - F 2 , the cylinder between the base and the boss is under the braking normal pressure F 1 and the applied pressure F 2 acts, and the cylinder produces a compressive deformation, and the deformation amount is proportional to the braking normal pressure F 1 . Opening process: When the disc brake is in the closed braking state, the oil pressure acting on the piston (11) overcomes the disc spring force generated by the compression deformation of the disc spring group (5), as well as the sum of the friction forces acting on the cylinder (4) and the piston (11) by the disc spring group (5), the brake seat (8), the hydraulic cylinder (9), the sealing ring 1 (10), the rear cover (15) and the sealing ring 2 (14), so as to continue to compress the disc spring group (5), so that the brake shoe (2) moves to the left and away from the brake disc (1), and the brake clearance is maintained at less than 2 mm set by the adjusting screw (12); Pre-driving monitoring process: Monitor the braking positive pressure through the braking positive pressure sensor (3). F 1 , if the braking positive pressure F 1 = 0, indicating no fault, then driving is allowed; if the braking positive pressure F 1 ≠ 0, diagnose the fault that the brake cannot be opened, then driving is not allowed, and driving is only allowed after the fault is eliminated; After monitoring no faults, during the driving process with the brake open, the brake disc (1) rotates to drive the hoist, and at the same time, the brake positive pressure sensor (3) monitors the brake positive pressure F 1 , when the brake positive pressure F 1 ≠ 0, diagnose the brake application fault, give an alarm in time and activate the safety brake. After eliminating the fault, driving is allowed again; During the braking process, the hydraulic oil pressure of the hydraulic cylinder (9) is unloaded to a residual pressure, the residual pressure value is less than 0.5 MPa, the disc spring force overcomes the oil pressure acting on the piston (11), as well as the sum of the friction forces acting on the cylinder (4) and the piston (11) by the disc spring assembly (5), the brake seat (8), the hydraulic cylinder (9), the sealing ring 1 (10), the rear cover (15) and the sealing ring 2 (14), thereby pushing the brake shoe (2) to move rightward and press the brake disc (1), thereby achieving closing braking; The above process is repeated to complete the real-time monitoring of the brake positive pressure and achieve reliable operation of the disc brake.

2. The method for monitoring the disc brake using a cylindrical sensor to monitor the positive brake pressure according to claim 1, Features: When the brake is released again, the brake positive pressure sensor (3) monitors the brake positive pressure F 1 , if the brake positive pressure F 1 is greater than or equal to the allowable value of the brake positive pressure, the next start is allowed; if the brake positive pressure F 1 is less than the allowable value of the brake positive pressure, a fault of insufficient brake positive pressure is diagnosed, then an alarm is given and the next start is blocked. After eliminating the potential fault, the brake is released again.

3. A disc brake in which a cylindrical sensor monitors the positive brake pressure of the disc brake implementing the disc brake monitoring method of claim 1, Features: The described brake positive pressure sensor (3) consists of a base, a boss, and a cylinder, with a cross-section in the shape of the Chinese character 'tu'. The right end face of the base of the brake positive pressure sensor (3) is connected to the brake shoe (2) and bears the brake positive pressure exerted by the brake disc (1) on the brake shoe (2). F 1 , the boss of the brake positive pressure sensor (3) passes through the inner hole of the cylinder body (4). The boss is in static fit with the inner hole of the cylinder body (4), and the boss supports the bottom of the inner hole of the cylinder body (4) and bears the resultant force of the disc spring force, frictional force, and oil pressure exerted by the disc spring group (5) at the bottom of the inner hole of the cylinder body (4). F 2 , a gap △ is left between the bottom end face of the cylinder body (4) and the left end face of the base of the brake positive pressure sensor (3). The cylinder body (4) is in movable fit with the hole of the brake holder (8); one end of the cylinder of the brake positive pressure sensor (3) passes through the piston (11) and is fixed by a nut (13); a pressure strain gauge (3-1) is attached to the cylindrical surface between the base and the boss of the brake positive pressure sensor (3), and the pressure strain gauge (3-1) is connected to a signal wire (3-2) extending outside the brake positive pressure sensor (3) to output the signal of the strain gauge (3-1) monitoring the brake positive pressure in real time. F 1 ​ 4. A disc brake with a cylindrical sensor for monitoring brake positive pressure according to claim 3, Features: The gap △ between the bottom end surface of the cylinder (4) and the base of the brake positive pressure sensor (3) is 2 mm.

5. A disc brake with a cylindrical sensor for monitoring brake positive pressure according to claim 3, Features: The number of pressure strain gauges (3-1) attached to the cylindrical surface between the base and the boss of the brake positive pressure sensor (3) is 2 to 4.

6. A disc brake with a cylindrical sensor for monitoring brake positive pressure according to claim 4 or 3, Features: The base of the brake positive pressure sensor (3) is a disc-shaped structure that is integrated with the cylinder and directly connected to the brake shoe (2) via a dovetail groove.

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