Disc brake with seat-type sensor for monitoring brake positive pressure and monitoring method thereof

Abstract

A disc brake with a seat-type sensor for monitoring brake positive pressure and a monitoring method thereof. The brake comprises a brake disc, a brake shoe cylinder, a brake seat, a disc spring group, a hydraulic cylinder, a piston, an adjusting screw, a rear cover and a lining plate. During braking, the bottom circular rings of the left and right annular grooves of the seat-type brake positive pressure sensor produce shear and bending deformations under the action of F1 and F2, which are strain areas. F1 is proportional to the strain amount. The strain signals of multiple strain gauges are output to a host computer through a signal line to monitor the magnitude of the brake positive pressure F1 in real time. F1 is used to diagnose faults and give control instructions: before driving, if it is equal to zero, driving is allowed; if it is not equal to zero, a brake failure to open is diagnosed and the current driving is locked; during operation, if it is not equal to zero, a brake application failure is diagnosed and safety braking is enabled; during braking, a value greater than or equal to the allowable value of the brake positive pressure is allowed to drive the next time; if it is less than the allowable value of the brake positive pressure, a brake positive pressure insufficient fault is diagnosed and the next driving is locked, thereby greatly improving the braking effect of the disc brake.

Description

Technical Field

[0001] The invention relates to a disc brake with a seat sensor for monitoring the positive braking pressure, and is particularly suitable for monitoring the positive braking pressure of disc brakes of mine hoists and belt conveyors, and is also suitable for monitoring the positive braking pressure of other disc brakes. Background Art

[0002] Patent No. ZL2008 10155642.3 discloses a disc spring seat sensor for disc brakes to monitor the positive braking pressure. The disc spring seat sensor disc body monitors the disc spring force generated by the deformation of the disc spring, which is not equal to the positive braking pressure of the brake shoe assembly pressed onto the brake disc. After the oil pressure drops from the open state to the residual oil pressure, the brake shoe assembly moves to the right under the action of the disc spring force to press against the brake disc during the braking process. The disc spring force must overcome the friction force of the disc spring hole, hydraulic cylinder and sealing ring, rear cover and sealing ring, and brake seat acting on the brake shoe assembly and the residual oil pressure acting on the piston, and finally reduces to the final positive braking pressure of the brake shoe assembly pressed onto the brake disc. Obviously, the disc spring force is greater than the positive braking pressure, and the positive braking pressure is not equal to the disc spring force. This patent mistakenly uses the disc spring force monitored by the disc spring seat sensor disc body as the positive braking pressure, and uses it as the basis for diagnosing faults. There are great hidden dangers. The lifting disc with the disc spring seat sensor disc body installed Type brake, although the monitored disc spring force is greater than or equal to the allowable value of the braking positive pressure, there have been accidents of brake failure. For example, the disc brake of a mine's inclined shaft hoist should use a disc spring with an inner hole diameter of 72mm, but a disc spring with an inner hole diameter of 71mm was used by mistake. During braking, the friction force of the disc spring hole on the brake shoe assembly was greater than the disc spring force, and a jamming fault occurred in which the disc spring force did not push the brake shoe assembly to the right. The brake shoe did not press onto the brake disc and the braking positive pressure was zero. The brake failure led to a major accident of the inclined shaft hoist running away, but the disc spring force monitored by the disc spring seat sensor disk was equal to the friction force of the disc spring hole on the brake shoe assembly, which was very large and not equal to zero, and the major fault of zero braking positive pressure was not monitored. The disc spring seat sensor disk monitors the disc spring force, not the braking positive pressure of the brake shoe pressing onto the brake disc, and cannot monitor the fault of insufficient braking positive pressure, and the monitored disc spring force is invalid.

[0003] When the car is started with the brake open, the brake shoe leaves the brake disc to maintain a certain brake gap, and the positive braking pressure should be zero, but the disc spring force is equal to the working oil pressure of the open brake. The disc spring force monitored by the disc spring seat sensor disc cannot diagnose the fault of the brake not opening when the car is started with the brake open.

[0004] This shows that it is effective to monitor the positive braking pressure of the brake shoe pressed onto the brake disc. For this reason, a disc brake that monitors the positive braking pressure of the brake shoe pressed onto the brake disc is invented. Summary of the invention

[0005] Technical problem: The purpose of the present invention is to address the deficiencies in the prior art and provide a brake and a monitoring method thereof that uses a seat-type sensor to monitor the positive braking pressure of the brake shoe pressed onto the brake disc.

[0006] Technical solution: A disc brake with a seat-type sensor for monitoring brake positive pressure of the present invention comprises: a brake disc, a brake shoe, a cylinder, a brake seat, a disc spring group, a hydraulic cylinder, a sealing ring one, a piston, a sealing ring two, an adjusting screw, a rear cover, a screw three and a lining plate. One side of the cylinder is dynamically fitted on the brake seat and connected to the piston, and the other side is connected to a seat-type brake positive pressure sensor. The seat-type brake positive pressure sensor is a stepped disc, and a left annular groove and a right annular groove are symmetrically opened on the outer circumference of the two end surfaces of the stepped disc. A plurality of strain gauges connected by signal lines are arranged in the left annular groove or the right annular groove. The cross-sectional thickness of the disc at the opposite position of the left annular groove and the right annular groove is 5-10mm. The inner end face of the left side of the stepped disc is slightly higher than the outer end seat face, and the inner end face of the right side is slightly lower than the outer end face. The outer end face of the right side of the seat-type brake positive pressure sensor is fixedly connected to the lining plate, and the lining plate and the brake shoe are connected as a whole via a dovetail groove.

[0007] The plurality of strain gauges are 4 to 8 pieces, which are evenly distributed on the ring at the bottom of the left annular groove or the right annular groove.

[0008] The cylinder is a tube, and the middle part of the seat-type brake positive pressure sensor connected to the cylinder is sequentially provided with an outer hole, a middle hole and an inner hole. A T-shaped connecting rod is provided in the cylinder on the same axis as the cylinder, and the disc spring assembly is mounted on the T-shaped connecting rod. The front part of the T-shaped connecting rod passes through the middle hole of the seat-type brake positive pressure sensor and is buckled and connected with the piston and fixed by three screws. The tail part of the T-shaped connecting rod cooperates with and is fixedly connected with the outer hole of the seat-type brake positive pressure sensor, and the inner hole of the seat-type brake positive pressure sensor is buckled on the outer end surface of the cylinder and fixed by screws.

[0009] The cylinder body is a flat-bottom sleeve with a center column. The flat-bottom sleeve and the seat-type brake positive pressure sensor are an integrated structure. The seat-type brake positive pressure sensor is located at the bottom of the flat-bottom sleeve. The end face fixedly connected to the lining plate is slightly higher than the bottom end face of the flat-bottom sleeve. The disc spring assembly is mounted in the flat-bottom sleeve. The head of the center column in the flat-bottom sleeve is buckled and connected to the piston and fixed by three screws.

[0010] The cylinder is a convex bottom sleeve with a center column. An outer hole and an inner hole are opened in the middle of the seat-type brake positive pressure sensor connected to the cylinder. The inner hole of the seat-type brake positive pressure sensor is sleeved on the convex bottom of the cylinder and fixed by screws. The outer circular end face of the seat-type brake positive pressure sensor is snapped into the connecting sleeve of the lining plate and fixed by screws. The disc spring assembly is sleeved in the convex bottom sleeve. The head of the center column in the convex bottom sleeve is snapped into connection with the piston and fixed by three screws.

[0011] The monitoring method of the disc brake using the above-mentioned seat-type sensor to monitor the positive brake pressure is as follows: during braking, the bottom rings of the left and right annular grooves of the seat-type positive brake pressure sensor produce shear and bending deformations under the action of F1 and F2, which are strain areas. F1 is proportional to the strain amount. The strain signals of multiple strain gauges are output to the host computer through the signal line to monitor the size of the positive brake pressure F1 in real time; the positive brake pressure F1 applied by the brake shoe to the brake disc is used as the basis for diagnosing faults and giving control instructions. The process is as follows:

[0012] Opening process: After the oil pressure in the closed brake state rises to the working oil pressure, the working oil pressure acting on the piston overcomes the disc spring force generated by the compression and deformation of the disc spring group and the friction force in all directions to continue to compress the disc spring group, so that the brake shoe moves left away from the gate disc, and the gate clearance is maintained at less than 2mm set by the adjusting screw;

[0013] Monitoring process before driving: Monitor the brake positive pressure F1 through the seat-type brake positive pressure sensor. If the brake positive pressure F1 = 0, it indicates that there is no fault, and the vehicle is allowed to drive. If the brake positive pressure F1 ≠ 0, the diagnosis brake cannot be opened, and the vehicle is not allowed to drive. The vehicle can only drive after the fault is eliminated.

[0014] During the gate opening status monitoring process, the gate disc rotates and the hoist starts to drive. At the same time, the seat-type brake positive pressure sensor monitors the brake positive pressure F1. When the brake positive pressure F1≠0, the gate application fault is diagnosed, and an alarm is given in time and the safety brake is activated. After the fault is eliminated, the drive is allowed again;

[0015] During the braking process, after the oil pressure drops from the open state to the residual oil pressure, the disc spring force generated by the compression and deformation of the disc spring group overcomes the residual oil pressure acting on the piston and the combined force of the friction forces around to push the brake shoe to the right and press the brake disc, thus achieving the closing brake;

[0016] During the monitoring process before the brake is opened after the brake is finished, the seat-type brake positive pressure sensor monitors the brake positive pressure F1. If the brake positive pressure F1 is greater than or equal to the allowable value of the brake positive pressure, the next start is allowed; if the brake positive pressure F1 is less than the allowable value of the brake positive pressure, the brake positive pressure is insufficient, and an alarm is sounded and the next start is locked. The gate can be opened after the hidden danger of the fault is eliminated;

[0017] The above process is repeated to complete the real-time monitoring of the brake positive pressure F1 and achieve reliable operation of the disc brake.

[0018] Beneficial effect: Due to the adoption of the above technical solution, the brake of the present invention can accurately monitor the positive braking pressure F1 of the brake shoe pressed on the brake disc, solving the problem that the brake in the prior art cannot monitor the positive braking pressure F1 of the brake shoe pressed on the brake disc. Since the disc spring force monitored by the disc spring seat sensor in the existing brake is not the positive braking pressure F1 of the brake shoe directly pressed on the brake disc, the disc spring force is equal to the positive braking pressure F1 after deducting the friction force and residual pressure at all places during braking. The disc spring force is greater than the positive braking pressure F1. It is very dangerous to mistakenly use the disc spring force monitored by the disc spring seat sensor disc as the positive braking pressure. The present invention uses the positive braking pressure applied by the monitored brake shoe to the brake disc as the basis for diagnosing faults and giving control instructions: before driving, it is equal to zero to allow driving, it is not equal to zero, the fault of the gate not opening is diagnosed, and the current driving is locked; during operation, it is not equal to zero, the gate application fault is diagnosed, and the safety brake is enabled; during braking, it is greater than or equal to the allowable value of the positive braking pressure, and the next driving is allowed. It is less than the allowable value of the positive braking pressure, and the fault of insufficient positive braking pressure is diagnosed, and the next driving is locked, which greatly improves the braking effect of the disc brake. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural diagram of the closed braking state of a disc brake in which a seat-type sensor monitors the positive braking pressure according to the first embodiment of the present invention.

[0020] Figure 2 It is a structural diagram of the disc brake in the open and start state in which the seat type sensor monitors the positive brake pressure according to the first embodiment of the present invention.

[0021] Figure 3 It is a structural diagram of the closed braking state of a disc brake in which a seat-type sensor monitors the positive braking pressure according to the second embodiment of the present invention.

[0022] Figure 4 It is a structural diagram of the disc brake in the open and start state in which the seat type sensor monitors the positive brake pressure according to the second embodiment of the present invention.

[0023] Figure 5 It is a structural diagram of the closed braking state of a disc brake in which a seat-type sensor monitors the positive braking pressure according to the third embodiment of the present invention.

[0024] Figure 6 It is a structural diagram of the disc brake in the open and start state in which the seat type sensor monitors the positive brake pressure according to the third embodiment of the present invention.

[0025] In the figure: 1—brake disc; 2—brake shoe; 3—screw one; 4—screw two; 5—seat-type brake positive pressure sensor; 5-1—strain gauge; 5-2—signal line; 6—key one; 7—key two; 8—cylinder; 9—brake seat; 10—disc spring assembly; 11—hydraulic cylinder; 12—sealing ring one; 13—piston; 14—sealing ring two; 15—adjusting screw; 16—rear cover; 17—screw three; 18—T-shaped connecting rod; 19—screw four; 20—lining plate; 21—guide key. DETAILED DESCRIPTION

[0026] The present invention will be further described below with reference to the embodiments in the accompanying drawings:

[0027] The present invention discloses a method for monitoring a disc brake using a seat-type sensor to monitor the positive braking pressure. During braking, the bottom rings of the left and right annular grooves of the seat-type positive braking pressure sensor 5 produce shear and bending deformations under the action of F1 and F2, which are strain areas. F1 is proportional to the amount of strain. The strain signals of the plurality of strain gauges 5-1 are output to the host computer through the signal line 5-2, and the magnitude of the positive braking pressure F1 is monitored in real time. The positive braking pressure F1 applied by the monitoring brake shoe 2 to the brake disc 1 is used as the basis for diagnosing faults and giving control instructions. The process is as follows:

[0028] Opening process: After the oil pressure in the brake-on state rises to the working oil pressure, the working oil pressure acting on the piston 13 overcomes the disc spring force generated by the compression and deformation of the disc spring group 10 and the friction forces at all four sides to continue compressing the disc spring group 10, so that the brake shoe 2 moves left away from the gate disc 1, and the gate clearance is maintained at less than 2 mm set by the adjusting screw 15;

[0029] Monitoring process before driving: monitor the brake positive pressure F1 through the seat-type brake positive pressure sensor 5. If the brake positive pressure F1 = 0, it indicates that there is no fault, and the vehicle is allowed to drive; if the brake positive pressure F1 ≠ 0, the diagnosis brake cannot open the fault, and the vehicle is not allowed to drive. The vehicle can only drive after the fault is eliminated;

[0030] During the monitoring process of the gate opening state, the gate disc 1 rotates to hoist the machine to start the operation, and at the same time, the seat-type brake positive pressure sensor 5 monitors the brake positive pressure F1. When the brake positive pressure F1≠0, the gate application fault is diagnosed, and an alarm is given in time and the safety brake is activated. After the fault is eliminated, the machine is allowed to start the operation again.

[0031] During the braking process, after the oil pressure drops from the open state to the residual oil pressure, the disc spring force generated by the compression and deformation of the disc spring group 10 overcomes the residual oil pressure acting on the piston 13 and the combined force of the friction forces around to push the brake shoe 2 to the right and press the brake disc 1, thus achieving the closing brake;

[0032] During the monitoring process before the brake is opened after the brake is finished, the seat-type brake positive pressure sensor 5 monitors the brake positive pressure F1. If the brake positive pressure F1 is greater than or equal to the allowable value of the brake positive pressure, the next start is allowed; if the brake positive pressure F1 is less than the allowable value of the brake positive pressure, the brake positive pressure is insufficient, and an alarm is sounded and the next start is locked. The gate can be opened after the hidden danger of the fault is eliminated;

[0033] The above process is repeated to complete the real-time monitoring of the brake positive pressure F1 and achieve reliable operation of the disc brake.

[0034] The allowable value of the braking positive pressure is as follows: according to Article 426 of the Coal Safety Regulations, the ratio of the braking torque generated by the braking device to the actual maximum load rotational torque of the lifting device shall not be less than 3. The braking torque shall be equal to 3 times the actual maximum load rotational torque of the lifting device. The braking torque divided by the friction coefficient and the braking radius is the allowable value of the braking positive pressure.

[0035] Embodiment 1: Figure 1 Figure 2The disc brake with a seat-type sensor for monitoring the positive pressure of the brake is shown, which is mainly composed of a brake disc 1, a brake shoe 2, a cylinder 8, a brake seat 9, a disc spring group 10, a hydraulic cylinder 11, a sealing ring 12, a piston 13, a sealing ring 2 14, an adjusting screw 15, a rear cover 16, a screw 3 17, a T-shaped connecting rod 18 and a lining plate 20. One side of the cylinder 8 is movably fitted on the brake seat 9, and a guide key 21 is provided at the fitting position, which is connected to the piston 13. The other side is connected to a seat-type positive pressure sensor 5 for braking. The seat-type positive pressure sensor 5 is a stepped disc, and a left annular groove and a right annular groove are symmetrically opened on the outer circumference of the two end surfaces of the stepped disc. A plurality of strain gauges 5-1 connected by a signal line 5-2 are provided on the bottom ring of the left annular groove, and the strain signal is output through the signal line 5-2. The plurality of strain gauges 5-1 are 4-8 pieces, which are evenly distributed on the ring at the bottom of the left annular groove or the right annular groove. The thickness of the disc cross section at the opposite position of the left annular groove and the right annular groove is not less than 5 mm, and is 5-10 mm according to the diameter of the disc. The inner end surface of the left side of the stepped disc is slightly higher than the outer end seat surface, and the inner end surface of the right side is slightly lower than the outer end surface. The outer end surface of the right side of the seat-type brake positive pressure sensor 5 is fixedly connected with the lining plate 20 through screws 3, and the lining plate 20 is connected with the brake shoe 2 as a whole through the dovetail groove. The seat-type brake positive pressure sensor 5 is connected to the brake shoe 2 as the same component, and monitors the brake disc 1 to apply the brake positive pressure F1 to the brake shoe 2; the cylinder 8 is a tube, and the middle part of the seat-type brake positive pressure sensor 5 connected to the cylinder 8 is successively opened with an outer hole, a middle hole and an inner hole, and a T-shaped connecting rod 18 is provided in the cylinder 8 on the same axis as the cylinder, and the disc spring group 10 is mounted on the T-shaped connecting rod 18. The front part of the T-shaped connecting rod 18 passes through the middle hole of the seat-type brake positive pressure sensor 5 and is engaged with the piston 13, and is fixed by multiple screws three 17, and the tail part of the T-shaped connecting rod 18 cooperates with the outer hole of the seat-type brake positive pressure sensor 5 and is fixedly connected by multiple screws four 19, and a key two 7 is provided at the fitting position, and the inner hole of the seat-type brake positive pressure sensor 5 is buckled on the outer end face of the cylinder 8 and is fixedly connected by multiple screws two 4. The bottom circular rings of the left and right annular grooves of the seat-type brake positive pressure sensor 5 produce shear and bending deformations under the action of F1 and F2, which are strain areas. F1 is proportional to the strain amount. The bottom circular ring of the left annular groove is provided with multiple strain gauges 5-1 connected by signal lines 5-2. The strain signal is output to the host computer through the signal line 5-2 to monitor the size of the brake positive pressure F1 in real time.During braking, the outer circular end face of the right annular groove of the seat-type brake positive pressure sensor 5 is subjected to the braking positive pressure F1 exerted by the brake disc 1 on the brake shoe 2 and the lining plate 20, and the inner end face of the left annular groove is subjected to the resultant force F2 of the disc spring force, the friction force at four sides, and the residual oil pressure. The friction force at four sides is the total friction force of the disc spring group 10, the brake seat 9, the hydraulic cylinder 11 and the sealing ring 12, the rear cover 16 and the sealing ring 2 14 acting on the T-shaped connecting rod 18, the cylinder 8, the small shaft and the large shaft of the piston 13 in sequence. The residual oil pressure is equal to the oil pressure when it is unloaded to the residual oil pressure during braking. The residual oil pressure value is less than 0.5MPa, F1=-F2, and the bottom thickness and width of the left and right annular grooves are determined according to the size of F1.

[0036] Implementation II. Figure 3 Figure 4 The disc brake with a seat-type sensor for monitoring the positive pressure of the brake is shown in the figure. The main structure is basically the same as that of the first embodiment, and the similarities are omitted. The differences are as follows: the cylinder 8 is a flat-bottomed sleeve with a center column. The flat-bottomed sleeve and the seat-type brake positive pressure sensor 5 are an integrated structure. The seat-type brake positive pressure sensor 5 is located at the bottom of the flat-bottomed sleeve, and the end surface fixedly connected to the lining plate 20 is slightly higher than the bottom end surface of the flat-bottomed sleeve. The disc spring group 10 is sleeved in the flat-bottomed sleeve. The head of the center column in the flat-bottomed sleeve is buckled and connected with the piston 13 and fixed by screw three 17. During braking, the outer circular end face of the right annular groove bears the braking positive pressure F1 exerted by the brake disc 1 through the brake shoe 2 and the lining plate 20, and the inner end face of the left annular groove bears the resultant force F2 of the disc spring force, the friction force at four sides, and the residual oil pressure. The friction force at four sides is the friction force of the disc spring group 10, the brake seat 9, the hydraulic cylinder 11 and the sealing ring 12, the rear cover 16 and the sealing ring 2 14 acting on the inner and outer shafts of the cylinder 8, and the small shaft and large shaft of the piston 13 respectively. The residual oil pressure is equal to the oil pressure unloaded to the residual oil pressure during braking. The residual oil pressure value is less than 0.5MPa, F1=-F2, and the bottom thickness and width of the left and right annular grooves are determined according to the size of F1.

[0037] Embodiment 3: Figure 5 Figure 6The disc brake with a seat-type sensor for monitoring the positive pressure of the brake is shown in the figure. The main structure is basically the same as that of the first embodiment, and the similarities are omitted. The differences are as follows: the cylinder 8 is a convex bottom sleeve with a center column, and the center of the seat-type brake positive pressure sensor 5 connected to the cylinder 8 is provided with an outer hole and an inner hole in the middle, and the inner hole of the seat-type brake positive pressure sensor 5 is sleeved on the convex bottom of the cylinder 8 and fixed by screws, and the outer cylindrical end surface of the seat-type brake positive pressure sensor 5 is buckled in the connecting sleeve of the lining plate 20 and fixed by screws, and the disc spring group 10 is sleeved in the convex bottom sleeve, and the center column head in the convex bottom sleeve is buckled and connected with the piston 13 and fixed by screw three 17. During braking, the outer circular end face of the right annular groove bears the braking positive pressure F1 exerted by the brake disc 1 through the brake shoe 2 and the lining plate 20, and the inner circular end face of the left annular groove bears the resultant force F2 of the disc spring force, the friction force at four sides, and the residual oil pressure. The friction force at four sides is the friction force of the disc spring group 10, the brake seat 9, the hydraulic cylinder 11 and the sealing ring 12, the rear cover 16 and the sealing ring 2 14 acting on the inner and outer shafts of the cylinder 8, and the small shaft and large shaft of the piston 13 respectively. The residual oil pressure is equal to the oil pressure unloaded to the residual oil pressure during braking. The residual oil pressure value is less than 0.5MPa, F1=-F2, and the bottom thickness and width of the left and right annular grooves are determined according to the size of F1.

Claims

1. A method for monitoring a disc brake using a seat-type sensor to monitor brake positive pressure, comprising a disc brake, the disc brake comprising: A brake disc (1), a brake shoe (2), a cylinder (8), a brake seat (9), a disc spring assembly (10), a hydraulic cylinder (11), a sealing ring 1 (12), a piston (13), a sealing ring 2 (14), an adjusting screw (15), a rear cover (16), a screw 3 (17) and a lining plate (20), wherein one side of the cylinder (8) is movably fitted on the brake seat (9) and connected to the piston (13), and the other side is connected to a seat-type brake positive pressure sensor (5), wherein the seat-type brake positive pressure sensor (5) is a stepped disc, and the two end surfaces of the stepped disc are symmetrical on the outer circumference. A left annular groove and a right annular groove are provided, and a plurality of strain gauges (5-1) connected by a signal line (5-2) are arranged in the left annular groove or the right annular groove, the thickness of the disc cross section at the left annular groove and the right annular groove is 5-10 mm, the inner end surface of the left side of the stepped disc is slightly higher than the outer end seat surface, and the inner end surface of the right side is slightly lower than the outer end surface, the outer end surface of the right side of the seat-type brake positive pressure sensor (5) is fixedly connected to the lining plate (20), and the lining plate (20) and the brake shoe (2) are connected as a whole via a dovetail groove; it is characterized in that: the monitoring method of the disc brake is as follows: During braking, the bottom rings of the left and right annular grooves of the seat-type brake positive pressure sensor (5) are F 1 and F 2 produces shear and bending deformation, which is the strain area. F 1 is proportional to the strain amount. The strain signals of multiple strain gauges (5-1) are output to the host computer through the signal line (5-2) to monitor the positive braking pressure in real time. F 1; monitor the positive braking pressure applied by the brake shoe (2) to the brake disc (1) F 1 As the basis for diagnosing faults and giving control instructions, the process is as follows: Opening process: After the oil pressure in the brake-on state rises to the working oil pressure, the working oil pressure acting on the piston (13) overcomes the disc spring force generated by the compression deformation of the disc spring assembly (10) and the friction forces at all four sides to continue compressing the disc spring assembly (10), causing the brake shoe (2) to move to the left and away from the brake disc (1), while maintaining the gate clearance set by the adjusting screw (15) to be less than 2 mm; Monitoring process before driving: Monitor the brake positive pressure through the seat-type brake positive pressure sensor (5) F 1. If the brake positive pressure F 1=0, indicating no fault, then driving is allowed; if the brake pressure is positive F 1≠0, if the diagnostic gate cannot be opened, the car is not allowed to start, and the car can only be started after the fault is eliminated; During the monitoring process of the gate opening state, the gate disc (1) rotates to start the hoist, and at the same time, the seat-type brake positive pressure sensor (5) monitors the brake positive pressure. F 1. When the brake positive pressure F When 1≠0, diagnose the brake failure, give an alarm and activate the safety brake in time, and allow the car to start again after the failure is eliminated; During the braking process, after the oil pressure drops from the open state to the residual oil pressure, the disc spring force generated by the compression deformation of the disc spring assembly (10) overcomes the residual oil pressure acting on the piston (13) and the combined force of the friction forces at all four sides to push the brake shoe (2) to the right and press the brake disc (1), thereby achieving closed braking; During the monitoring process before the brake is opened after the brake is finished, the seat-type brake positive pressure sensor (5) 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 drive is allowed; if the brake positive pressure F 1 is less than the allowable value of the positive brake pressure, and the fault of insufficient positive brake pressure is diagnosed, then an alarm is given and the brake is locked for the next start. The brake can be opened after the hidden danger of the fault is eliminated; Cycle the above process to complete real-time monitoring of brake positive pressure F 1. Achieve reliable operation of disc brakes.

2. The method for monitoring a disc brake using a seat-type sensor to monitor the positive brake pressure according to claim 1, characterized in that: The plurality of strain gauges (5-1) in the disc brake is 4 to 8 pieces, and are evenly distributed on the ring at the bottom of the left annular groove or the right annular groove.

3. The method for monitoring a disc brake using a seat-type sensor to monitor the positive brake pressure according to claim 1, characterized in that: The cylinder (8) in the disc brake is a tube, and the middle part of the seat type brake positive pressure sensor (5) connected to the cylinder (8) is sequentially provided with an outer hole, a middle hole and an inner hole. A T-shaped connecting rod (18) is provided in the cylinder (8) on the same axis as the cylinder, and the disc spring assembly (10) is sleeved on the T-shaped connecting rod (18). The front part of the T-shaped connecting rod (18) passes through the middle hole of the seat type brake positive pressure sensor (5) and is buckled and connected with the piston (13), and is fixed by screw three (17). The rear part of the T-shaped connecting rod (18) is matched with and fixedly connected with the outer hole of the seat type brake positive pressure sensor (5), and the inner hole of the seat type brake positive pressure sensor (5) is buckled on the outer end surface of the cylinder (8) and is fixed by screws.

4. The method for monitoring a disc brake using a seat-type sensor to monitor the positive brake pressure according to claim 1, characterized in that: The cylinder (8) in the disc brake is a flat-bottomed sleeve with a center column. The flat-bottomed sleeve and the seat-type brake positive pressure sensor (5) are an integrated structure. The seat-type brake positive pressure sensor (5) is located at the bottom of the flat-bottomed sleeve, and the end surface fixedly connected to the lining plate (20) is slightly higher than the bottom end surface of the flat-bottomed sleeve. The disc spring group (10) is sleeved in the flat-bottomed sleeve. The head of the center column in the flat-bottomed sleeve is buckled and connected to the piston (13) and fixed by screw three (17).

5. The method for monitoring a disc brake using a seat-type sensor to monitor the positive brake pressure according to claim 1, characterized in that: The cylinder (8) in the disc brake is a convex bottom sleeve with a center column. The seat-type brake positive pressure sensor (5) connected to the cylinder (8) has an outer hole and an inner hole in the middle. The inner hole of the seat-type brake positive pressure sensor (5) is sleeved on the convex bottom of the cylinder (8) and fixed by screws. The outer cylindrical end surface of the seat-type brake positive pressure sensor (5) is buckled in the connecting sleeve of the lining plate (20) and fixed by screws. The disc spring group (10) is sleeved in the convex bottom sleeve. The head of the center column in the convex bottom sleeve is buckled and connected with the piston (13) and fixed by screw three (17).

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