Emergency braking steel wire rope wriggling restraining mechanism of tower type multi-rope friction type hoister

Abstract

The utility model discloses an emergency braking steel wire rope wriggling restraining mechanism of a tower type multi-rope friction type hoister, which relates to the technical field of hoister braking systems and comprises a hoisting wheel, a steel wire rope is wound on the hoisting wheel, a skip bucket is connected onto the steel wire rope, a guide wheel is arranged on the side portion of the steel wire rope and mounted on a wheel shaft, and the wheel shaft is mounted on a supporting frame. A wriggling suppressor is mounted on the side part of the guide wheel and comprises brake shoes clamped on the front and rear sides of the guide wheel and a connecting frame for fixing the brake shoes; the brake shoe is connected with a control system capable of controlling the brake shoe to loosen or clamp the guide wheel; once it is detected that the acceleration change of the guide wheel is large, the steel wire rope wriggle restraining mechanism generates frictional resistance to limit rapid rotation of the guide wheel and prevent relative sliding of the steel wire rope and a friction pad during emergency braking, the safety performance and the production efficiency of the mine hoist are improved, and healthy and safe operation of the hoist is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of hoist braking systems, in particular to an emergency braking wire rope creep suppression mechanism for a tower-type multi-rope friction hoist. Background Art

[0002] In recent years, mine hoists have been continuously developing towards large-scale, heavy-load and high-speed operation. For multi-rope friction hoists, the friction between the wire rope and the pad is its power source, which is used to realize the process of lifting coal and lowering coal for the skip.

[0003] Since mine hoists use wire rope transmission, which is a typical flexible transmission system, they produce severe impact and vibration during emergency braking. As the lifting load, operating speed and lifting height increase, the hoist is very likely to cause relative sliding between the wire rope and the friction pad (i.e. wire rope creep) during emergency braking, and may even induce serious consequences such as wire rope slippage and breakage, affecting the safe operation of the hoist. Utility Model Content

[0004] The purpose of the utility model is to provide a wire rope creep suppression mechanism for emergency braking of a tower-type multi-rope friction hoist. Once a large change in the acceleration of the guide wheel is detected, the wire rope creep suppression mechanism generates friction resistance to limit the rapid rotation of the guide wheel, thereby preventing relative sliding between the wire rope and the friction pad during emergency braking, thereby improving the safety performance and production efficiency of the mine hoist and ensuring the healthy and safe operation of the hoist.

[0005] The utility model includes a lifting wheel, a steel wire rope is wound on the lifting wheel, a bucket is connected to the steel wire rope, a guide wheel is provided on the side of the steel wire rope, the guide wheel is installed on the wheel axle, the wheel axle is installed on the support frame, a creep suppressor is installed on the side of the guide wheel, the creep suppressor includes brake shoes clamped on the front and rear sides of the guide wheel, and a connecting frame for fixing the brake shoes; the brake shoes are connected to a control system that can control the brake shoes to loosen or clamp the guide wheel.

[0006] Preferably, there are no less than two brake shoes, which are spaced apart along the outer arc of the guide wheel.

[0007] Preferably, the connecting frame is located on the guide wheel side and has an arc shape that is adapted to the outer arc of the guide wheel.

[0008] Preferably, the control system includes a hydraulic device and a control device. The hydraulic device includes a hydraulic cylinder. The hydraulic cylinder is provided with an oil inlet and an oil outlet. A piston is connected to the hydraulic cylinder. The piston is connected to the brake shoe through a piston rod.

[0009] Preferably, the control device includes an oil tank, a filter, a motor, a variable pump, a relief valve, a one-way valve, an electro-hydraulic proportional reversing valve, an accumulator, and a pressure sensor. The inlet of the variable pump is connected to the oil tank through the filter, the outlet of the variable pump is connected to the P port of the electro-hydraulic proportional reversing valve through the one-way valve, the oil inlet of the electro-hydraulic proportional reversing valve is connected to the relief valve and the accumulator, and the oil outlet A of the electro-hydraulic proportional valve is connected to the peristaltic suppressor.

[0010] In summary, the present invention has the following beneficial effects:

[0011] The utility model installs a creep suppressor on the side of the guide wheel. The brake shoe connection of the creep suppressor is capable of controlling the control system of loosening or clamping the guide wheel with the brake shoe. The brake shoe can be conveniently controlled to fit the guide wheel through the hydraulic cylinder to control the rotation speed of the guide wheel. The greater the acceleration change of the guide wheel, the greater the torque applied to the guide wheel, so that the rope groove of the guide wheel generates friction resistance to the wire rope, thereby suppressing the creep of the wire rope during emergency braking. The device has the advantages of small size, light weight, sensitive action, good adjustability of braking torque, etc., can prevent the safety hazards of wire rope slippage and breakage caused by wire rope creep, and improve coal mine production efficiency and operation safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a structural diagram of the emergency brake wire rope creep suppression mechanism of the tower-type multi-rope friction hoist of the utility model;

[0013] Figure 2 Schematic diagram of the structure of the guide wheel;

[0014] Figure 3 It is the structural principle diagram of the hydraulic device;

[0015] Figure 4 This is the structural principle diagram of the control device;

[0016] Figure 5 This is the control logic diagram of the control system.

[0017] In the figure: 1. Guide wheel; 2. Wheel axle; 3. Support frame; 4. Peristaltic suppressor; 5. Brake shoe; 6. Connecting frame; 7. Oil tank; 8. Filter; 9. Motor; 10. Variable pump; 11. Overflow valve; 12. Check valve; 13. Electro-hydraulic proportional reversing valve; 14. Accumulator; 15. Lifting wheel; 16. Pressure sensor; 17. Wire rope; 18. Bucket; 19. Hydraulic cylinder; 20. Oil inlet; 21. Oil outlet; 22. Piston; 23. Piston rod. DETAILED DESCRIPTION

[0018] The present invention will be further described below with reference to the accompanying drawings.

[0019] The orientations mentioned in this specification are based on the orientations of the emergency brake wire rope creep suppression mechanism of the tower-type multi-rope friction hoist of the present invention during normal operation, and do not limit the orientations during storage and transportation. They only represent relative positional relationships, not absolute positional relationships.

[0020] like Figure 1 and Figure 2 As shown together, the tower multi-rope friction hoist emergency brake wire rope creep suppression mechanism includes a lifting wheel 15, a wire rope 17 is wound on the lifting wheel 15, a bucket 18 is connected to the wire rope 17, a guide wheel 1 is provided on the side of the wire rope 17, the guide wheel 1 is mounted on the wheel axle 2, the wheel axle 2 is mounted on the support frame 3, a creep suppressor 4 is installed on the side of the guide wheel 1, the creep suppressor 4 includes a brake shoe 5 clamped on the front and rear sides of the guide wheel 1, and a connecting frame 6 for fixing the brake shoe 5; the brake shoe 5 is connected to a control system that can control the brake shoe 5 to loosen or clamp the guide wheel 1.

[0021] When the guide wheel 1 rotates up and down normally under the traction of the wire rope 17, there is a gap between the brake shoe 5 and the guide wheel 1, which does not affect the normal operation of the guide wheel 1; during emergency braking, when the acceleration of the guide wheel 1 changes greatly, the creep suppressor 4 applies a braking force to the guide wheel 1, thereby increasing the friction resistance between the wire rope 17 and the guide wheel 1, thereby suppressing the creep of the wire rope 17.

[0022] Preferably, there are no less than two brake shoes 5, which are arranged at intervals along the outer arc of the guide wheel 1. In this embodiment, there are three brake shoes 5, which are distributed within the range of about 1 / 4 of the arc of the guide wheel 1, so that the braking effect is better; several brake shoes 5 are fixed on the connecting frame 6, and the connecting frame 6 is located on the side of the guide wheel 1 and is in an arc shape that is adapted to the outer arc of the guide wheel 1, so that the guide wheel 1 can slide freely without interfering with the connecting frame 6.

[0023] like Figure 3 The control system includes a hydraulic device and a control device. The hydraulic device includes a hydraulic cylinder 19. The hydraulic cylinder 19 is provided with an oil inlet 20 and an oil outlet 21. A piston 22 is connected to the hydraulic cylinder 19. The piston 22 is connected to the brake shoe 5 through a piston rod 23.

[0024] like Figure 3 and Figure 4 As shown, the control device includes an oil tank 7, a filter 8, a motor 9, a variable pump 10, a relief valve 11, a one-way valve 12, an electro-hydraulic proportional directional valve 13, an accumulator 14, and a pressure sensor 16. The inlet of the variable pump 10 is connected to the oil tank 7 through the filter 8, and the outlet of the variable pump 10 is connected to the P port of the electro-hydraulic proportional directional valve 13 through the one-way valve 12. The oil inlet of the electro-hydraulic proportional directional valve 13 is connected to the relief valve 11 and the accumulator 14, and the oil outlet A of the electro-hydraulic proportional directional valve 13 is connected to the peristaltic suppressor 4.

[0025] The working principle is as follows: when the hoist is operating normally, the electro-hydraulic proportional reversing valve 13 is in the normal position, the brake shoe 5 is open and in the released state, and the hoist sends an emergency braking signal after power failure, the motor 9 and the variable pump 10 lose power, the accumulator 14 provides oil pressure as the circuit pressure source, and the photoelectric encoder continuously collects the speed of the guide wheel 1. The controller calculates the actual deceleration of the hoist through the speed, outputs the oil pressure control command according to the deviation between the given and actual, and changes the oil pressure in the peristaltic suppressor 4 through the electro-hydraulic proportional reversing valve 13, thereby changing the braking torque; under the action of hydraulic pressure, the hydraulic cylinder 19 is filled with hydraulic oil, the piston 22 moves, and the brake body and brake shoe 5 are in contact with the guide wheel 1, which is the braking state; after the electro-hydraulic proportional reversing valve 13 returns oil, the oil pressure in the cylinder decreases, the spring pushes the brake body and brake shoe 5 to move, the piston 22 moves in the opposite direction, and the brake shoe 5 is separated from the brake disc, which is the released state. The braking torque in the braking state depends on the hydraulic oil pressure in the hydraulic cylinder 19.

[0026] like Figure 5 As shown, when constant deceleration emergency braking is performed, the speed n of the guide wheel 1 is used as the ideal input curve, which is converted into a voltage signal u by controller 1 and fed to the proportional solenoid in the electro-hydraulic proportional reversing valve 13. The valve core of the electro-hydraulic proportional reversing valve 13 moves to control the valve port output oil pressure to flow into or out of the hydraulic cylinder 19; at the same time, the output pressure P2 is fed back to controller 2 via the u-p sensor to form a pressure closed-loop control. The outlet pressure P2 controls the braking pressure generated between the brake shoe 5 and the guide wheel 1 plate to suppress the creep of the wire rope 17. The speed sensor on the guide wheel 1 feeds back to controller 1 to determine the magnitude of the acceleration change. When the change is large, the voltage signal u is output to form a speed closed-loop control. Under the joint action of the two controllers, the relative sliding between the wire rope 17 and the friction pad is suppressed, ensuring that the creep of the wire rope 17 is reduced when the hoist is emergency braked, thereby ensuring the safe operation of the hoist.

[0027] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present invention should also fall within the scope of protection of the present invention.

Claims

1. Emergency brake wire rope creep suppression mechanism for tower type multi-rope friction hoist, characterized by: The invention comprises a lifting wheel (15), a steel wire rope (17) is wound around the lifting wheel (15), a bucket (18) is connected to the steel wire rope (17), a guide wheel (1) is provided on the side of the steel wire rope (17), the guide wheel (1) is mounted on a wheel axle (2), the wheel axle (2) is mounted on a support frame (3), a creep suppressor (4) is installed on the side of the guide wheel (1), the creep suppressor (4) comprises brake shoes (5) clamped on the front and rear sides of the guide wheel (1), and a connecting frame (6) for fixing the brake shoes (5); the brake shoes (5) are connected to a control system capable of controlling the brake shoes (5) to loosen or clamp the guide wheel (1).

2. The tower type multi-rope friction hoist emergency brake wire rope creep suppression mechanism according to claim 1, characterized in that: There are no less than two brake shoes (5) arranged at intervals along the outer arc of the guide wheel (1).

3. The tower type multi-rope friction hoist emergency brake wire rope creep suppression mechanism according to claim 1, characterized in that: The connecting frame (6) is located on the side of the guide wheel (1) and has an arc shape that is adapted to the outer arc of the guide wheel (1).

4. The tower type multi-rope friction hoist emergency brake wire rope creep suppression mechanism according to claim 1, characterized in that: The control system comprises a hydraulic device and a control device. The hydraulic device comprises a hydraulic cylinder (19). The hydraulic cylinder (19) is provided with an oil inlet (20) and an oil outlet (21). A piston (22) is connected inside the hydraulic cylinder (19). The piston (22) is connected to the brake shoe (5) via a piston (22) rod.

5. The tower type multi-rope friction hoist emergency brake wire rope creep suppression mechanism according to claim 4, characterized in that: The control device comprises an oil tank (7), a filter (8), a motor (9), a variable pump (10), a relief valve (11), a one-way valve (12), an electro-hydraulic proportional reversing valve (13), an accumulator (14) and a pressure sensor (16). The inlet of the variable pump (10) is connected to the oil tank (7) through the filter (8), the outlet of the variable pump (10) is connected to the P port of the electro-hydraulic proportional reversing valve (13) through the one-way valve (12), the oil inlet (20) of the electro-hydraulic proportional reversing valve (13) is connected to the relief valve (11) and the accumulator (14), and the oil outlet (21) A of the electro-hydraulic proportional reversing valve (13) is connected to the peristaltic suppressor (4).

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