Overwinding protection device for large-inertia hoisting container in deep well

Abstract

The invention discloses an overwinding protection device for a deep well large-inertia hoisting container and a using method. A main body of the overwinding protection device is composed of a disc-shaped permanent magnet retarding device and a friction type overwinding protection device. The disc-shaped permanent magnet retarding device comprises cross beam pulley blocks located on the two sides, the cross beam pulley blocks are hinged to supporting holes fixed to a mine derrick through steel wire ropes, and the steel wire ropes are connected with an eddy current retarding winding drum through fixed pulleys. Steel wire ropes on the two sides of the vortex retarding winding drum are connected with the friction type over-winding protection device through a rope storage box. According to the device and the method, speed reduction treatment is carried out on the hoisting container in an over-winding accident, the final braking distance is adjusted, final braking is achieved through the friction type over-winding protection device, and then potential safety hazards caused by the over-winding accident in the using process of the hoisting container are reduced and even eliminated.

Description

Technical Field

[0001] This invention belongs to the field of safety protection for mine hoisting systems, specifically relating to an overwind protection device for a deep well large inertia hoisting container and its usage method. Background Technology

[0002] Coal is one of China's most important energy sources, playing a supporting role in the country's economic development. Due to the inherent difficulties and risks of coal mining, ensuring safe, reliable, and efficient production places correspondingly higher demands on the technology and management of mining, transportation, and hoisting equipment. With the scarcity of surface coal seams, deep-well mining has become a necessary option, requiring more advanced technologies and stringent safety measures to ensure high efficiency and low risk in the mining process.

[0003] Coal is one of China's most important energy sources, playing a supporting role in the country's economic development. Due to the inherent difficulties and risks of coal mining, ensuring safe, reliable, and efficient production places correspondingly higher demands on the technology and management of mining, transportation, and hoisting equipment. With the scarcity of surface coal seams, deep-well mining has become a necessary option, requiring more advanced technologies and stringent safety measures to ensure high efficiency and low risk in the mining process.

[0004] Mine hoisting systems are crucial equipment in coal mining, responsible not only for transporting coal from underground to the surface but also for the lifting and lowering of personnel. Therefore, their safety directly impacts the lives of miners and the efficient extraction of mineral resources. As the core of the hoisting system, the stability of the hoist determines the safety and efficiency of the entire hoisting process. Overwinding accidents are extremely dangerous situations that typically occur when the hoisting container continues to rise (or fall) beyond its predetermined stop position. These accidents can be caused by factors such as operational errors, braking system malfunctions, or problems with the electrical control system. Such accidents not only result in costly equipment damage but can also cause personal injury and production stoppages, with very serious consequences.

[0005] To prevent overwinding accidents, commonly used overwinding protection devices for hoisting containers both domestically and internationally include the following: wedge-shaped wooden guideway overwinding protection devices, friction-type overwinding protection devices, steel belt-type overwinding protection devices, and hydraulic overwinding protection devices. These traditional friction braking devices all rely on physical contact to generate friction to slow down or stop the hoisting container. While effective, long-term use may lead to equipment wear and affect braking performance. Furthermore, due to the high hoisting speed and large inertia in deep wells, relying solely on these methods is insufficient to guarantee the safety and reliability of mining production.

[0006] Eddy current retarding braking technology, as a non-contact braking technology, utilizes eddy currents generated by the movement of conductive materials in a magnetic field to resist motion, thereby achieving smooth and wear-free braking. Compared with traditional overwind protection devices, it not only provides more stable and reliable braking force but also reduces maintenance requirements and improves overall safety. It is a very promising braking technology for overwind protection devices of deep well high-inertia hoisting containers.

[0007] The braking torque of eddy current retardation is positively correlated with the frequency at which the target cuts the magnetic field lines. As the target's speed decreases, the braking effect also weakens, so eddy current retardation alone cannot achieve final braking. However, it can be combined with traditional overwind protection devices. First, eddy current braking is used to control the speed of the lifting container within a certain range, and then friction braking is used to achieve final braking, which greatly reduces wear on the equipment.

[0008] Therefore, this invention proposes an overwind protection device for a deep well large inertia hoisting container that combines a disc-shaped permanent magnet deceleration device with a friction-type overwind protection device. Summary of the Invention

[0009] The present invention addresses the shortcomings of the existing technology by providing an overwind protection device for a deep well high-inertia hoisting container. This device includes a disc-shaped permanent magnet decelerator and a friction-type overwind protection device. It can decelerate the hoisting container, adjust the final braking distance, and then use the friction-type overwind protection device to achieve final braking, thereby reducing or even eliminating safety hazards caused by overwinding accidents during the operation of the hoisting container. To solve the above problems, the technical solution adopted by the present invention is as follows: An overwind protection device for a deep well high-inertia hoisting container includes a disc-shaped permanent magnet deceleration device and a friction-type overwind protection device.

[0010] The disc-shaped permanent magnet decelerator includes a connection hole that is fixedly connected to the mine headframe. A steel wire rope is hinged to the connection hole. The steel wire rope passes through the crossbeam pulley block and is connected to the eddy current deceleration drum through a fixed pulley. The eddy current deceleration drum is connected to a rope storage box through steel wire ropes on both sides. The rope storage box is then connected to the friction-type overwind protection device.

[0011] A further technical improvement of the present invention is that: the beam pulley assembly includes a beam, on which auxiliary pulleys and a main pulley bracket are mounted, the main pulley bracket is equipped with a shaft end cap and a bearing, and the main pulley is mounted on the shaft and connected to the bearings at both ends.

[0012] A further technical improvement of the present invention is that: the eddy current slow-moving drum is mounted on a drum support via a shaft; the drum includes a brake disc, a drum, a magnetic yoke, a permanent magnet, and a wedge; the drum constrains the wire rope through a groove and is fixed to the drum by the wedge.

[0013] A further technical improvement of the present invention is that: the wire rope drives the drum, and the drum then begins to pull the wire rope in the rope storage box. After a certain length of the wire rope determined according to relevant principles has been completely pulled out, the friction-type overwind protection device starts to work and completes the final braking.

[0014] A further technical improvement of the present invention is that: the friction-type overwind protection device includes a roller, the roller drives the inner brake disc and the outer brake disc to brake the friction plate, the nut drives the main shaft to adjust the positive pressure on the friction plate, and the support provides support for the whole device.

[0015] A further technical improvement of the present invention is that: the crossbeam is driven upward by the lifting container, the main pulley on the crossbeam drives the wire rope upward, one end of the wire rope is fixed to the connecting hole, and the auxiliary pulleys on both sides prevent the wire rope from rubbing against the crossbeam during the upward process. The main pulley is equivalent to the movable pulley. When the height increases by one unit, the wire rope will extend by two units, thereby the brake disc will obtain two times the rotation speed and provide greater braking force.

[0016] A further technical improvement of the present invention is that: the magnetic yoke iron disk is fixed on the mine headframe and distributed with multiple magnet slots divided according to the Halbach array, and the permanent magnet is fixed on the magnetic yoke iron disk.

[0017] A protection method for a deep well high-inertia hoisting container protection device specifically includes the following steps: S1. Install and fix the overwind protection device of the hoisting system on the derrick, install permanent magnets (4-4) according to the Halbach array, adjust the length of the wire rope (5) in the rope storage box (7), adjust the preload provided by the nut (6-7) to complete the arrangement; S2. When an overwinding accident occurs in the lifting system, the lifting container drives the crossbeam (1-1) to continue moving upward. One end of the wire rope (2) is fixed to the connecting hole (10) and does not move. The other end passes through the auxiliary pulley (1-4), the main pulley (1-3), the auxiliary pulley (1-4), and then through the fixed pulley (3) to drive the drum (4-2) to rotate. Then the brake disc (4-1) starts to rotate, the permanent magnet (4-4) remains stationary, and the brake disc (4-1) performs the action of cutting the magnetic field lines to slow down the eddy current. At the same time, the wire ropes (5) on both sides of the drum (4-2) begin to converge. S3. After the lifting container is slowed down by the eddy current, its speed is greatly reduced, but it continues to move upward. When all the wire rope (5) in the rope storage box (7) is wound away by the drum (4-2), the wire rope (5) further drives the friction overwind protection device (6) to start braking. The drum (6-1) drives the inner brake disc (6-3) and the outer brake disc (6-2) to friction brake with the friction plate (6-6) to complete the final braking.

[0018] The present invention has the following beneficial effects: 1. The overwind protection device of the present invention is fixedly installed on the derrick, realizing the safety protection of the hoisting system that combines eddy current deceleration and friction braking. It has strong adaptability and high safety.

[0019] 2. The beam pulley block of the present invention is equivalent to a movable pulley, which creates double the extension and retraction of the braking distance for the traction drum, doubles the rotation speed of the brake disc, and provides a better braking effect.

[0020] 3. The wire rope of the present invention is equipped with an auxiliary pulley and a fixed pulley. The former ensures that the wire rope will not wear down the crossbeam when it rises with the crossbeam, and the latter ensures that the movement trajectory of the wire rope will not become entangled and cause damage to the derrick.

[0021] 4. The grooves on the drum of the present invention ensure that the wire rope will not become tangled at the bottom of the drum, thereby reducing the wear of the wire rope, increasing its service life, and further reducing the maintenance time required due to frequent inspection and replacement of the wire rope during the maintenance process.

[0022] 5. The permanent magnet layout of the present invention adopts a Halbach array. Under the same amount of permanent magnet material, the Halbach permanent magnet air gap magnetic density is greater and the iron loss is smaller, so as to maximize the magnetic field with less magnet material.

[0023] 6. The rope storage box of the present invention can determine the activation time of the friction overwind protection device by adjusting the storage length of the wire rope, which has good controllability and effectively connects eddy current retardation and friction braking. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overwind protection device for a deep well high-inertia hoisting container according to the present invention. Figure 2 Schematic diagram of the beam pulley system Figure 3 Schematic diagram of vortex slow-moving drum structure Figure 4 Schematic diagram of friction-type overwind protection device Figure 5 Schematic flowchart of the overwind protection device for a large inertia hoisting container in a deep well. In the diagram: 1-Crossbeam pulley block, 2-Wire rope, 3-Fixed pulley, 4-Eddy current slow-moving drum, 5-Wire rope, 6-Friction overwind protection device, 7-Rope storage box, 8-Drum support, 9-Shaft, 10-Connecting hole, 1-1-Crossbeam, 1-2-Main pulley bracket, 1-3-Main pulley, 1-4-Auxiliary pulley, 1-5-Bearing, 1-6-Shaft, 1-7-Shaft end cover, 4-1-Brake disc, 4-2-Drum, 4-3-Magnetic yoke disc, 4-4-Permanent magnet, 4-5-Wedge, 6-1 Roller, 6-2 Outer brake disc, 6-3 Inner brake disc, 6-4 Main shaft, 6-5 Brake, 6-6 Friction plate, 6-7 Nut. Detailed Implementation

[0025] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0026] An overload protection device for a deep well high-inertia lifting container, such as Figure 1 As shown, it consists of a disc-shaped permanent magnet deceleration device and a friction-type overwind protection device. The disc-shaped permanent magnet deceleration device includes a connecting hole 10 located on the mine headframe. The connecting hole 10 fixes the wire rope 2. The wire rope 2 passes through a crossbeam pulley block 1 and a fixed pulley 3, and then winds around the eddy current deceleration drum 4. The eddy current deceleration drum 4 is installed on a drum support 8 through a shaft 6. The wire rope 5 is connected to the eddy current deceleration drum 4 and the friction-type overwind protection device 6 through a rope storage box 7.

[0027] like Figure 2 As shown, the crossbeam pulley block 1 is supported by the crossbeam 1-1. The auxiliary pulley 1-4 and the main pulley 1-3 are located on the crossbeam 1-1. The main pulley 1-3 is mounted on the main pulley bracket 1-2 through the shaft 1-6. The bearing 1-5 is placed between the shaft 1-6 and the main pulley bracket 1-2. The shaft end cap 1-7 is located at one end of the main pulley bracket 1-2.

[0028] like Figure 3 As shown, the eddy current slow-moving drum 4 includes a brake disc 4-1, which rotates with the drum 4-2. The wire rope 2 and the wire rope 5 are fixed to the drum 4-2 by wedges 4-5. The magnetic yoke iron disc 4-3 maintains a small air gap with the brake disc 4-1. The permanent magnet 4-4 is located in multiple magnet slots of the magnetic yoke iron disc 4-3.

[0029] like Figure 4As shown, the friction-type overwind protection device 6 includes a roller 6-1, which drives the inner brake disc 6-3 and the outer brake disc 6-2 to brake the friction plate 6-6. The nut 6-7 drives the main shaft 6-4 to adjust the positive pressure on the friction plate 6-6. The support 6-5 provides support for the entire device.

[0030] A protection method for an overwind protection device of a deep well high-inertia hoisting container specifically includes the following steps: S1. Install and fix the overwind protection device of the hoisting system on the derrick, install permanent magnets (4-4) according to the Halbach array, adjust the length of the wire rope (5) in the rope storage box (7), adjust the preload provided by the nut (6-7) to complete the arrangement; S2. When an overwinding accident occurs in the lifting system, the lifting container drives the crossbeam (1-1) to continue moving upward. One end of the wire rope (2) is fixed to the connecting hole (10) and does not move. The other end passes through the auxiliary pulley (1-4), the main pulley (1-3), the auxiliary pulley (1-4), and then through the fixed pulley (3) to drive the drum (4-2) to rotate. Then the brake disc (4-1) starts to rotate, the permanent magnet (4-4) remains stationary, and the brake disc (4-1) performs the action of cutting the magnetic field lines to slow down the eddy current. At the same time, the wire ropes (5) on both sides of the drum (4-2) begin to converge. S3. After the lifting container is slowed down by the eddy current, its speed is greatly reduced, but it continues to move upward. When all the wire rope (5) in the rope storage box (7) is wound away by the drum (4-2), the wire rope (5) further drives the friction overwind protection device (6) to start braking. The drum (6-1) drives the inner brake disc (6-3) and the outer brake disc (6-2) to friction brake with the friction plate (6-6) to complete the final braking.

[0031] This invention reduces the speed of the lifting container in the event of an overwinding accident, adjusts the final braking distance, and then uses a friction-type overwinding protection device to achieve final braking, thereby reducing or even eliminating the safety hazards caused by overwinding accidents during the use of the lifting container.

[0032] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention, and these equivalent transformations all fall within the protection scope of the present invention.

Claims

1. A protection device for overwinding of a deep well high-inertia hoisting container, characterized in that: It consists of a disc-shaped permanent magnet deceleration device and a friction-type overwind protection device (6); the disc-shaped permanent magnet deceleration device includes a connection hole (10) that is fixedly connected to the mine headframe; a steel wire rope (2) is hinged to the connection hole (10), the steel wire rope (2) passes through the crossbeam pulley block (1) and is connected to the eddy current deceleration drum (4) through the fixed pulley (3), the eddy current deceleration drum (4) is connected to the rope storage box (7) through the steel wire ropes (5) on both sides, and the rope storage box (7) is then connected to the friction-type overwind protection device (6).

2. The overwind protection device for a deep well high-inertia hoisting container according to claim 1, characterized in that: The beam pulley assembly (1) includes a beam (1-1), on which an auxiliary pulley (1-4) and a main pulley bracket (1-2) are installed. The main pulley bracket (1-2) is fitted with a shaft end cap (1-7) and a bearing (1-5). The main pulley (1-3) is mounted on a shaft (1-6) and connected to the bearing (1-5) at both ends.

3. The overwind protection device for a deep well high-inertia hoisting container according to claim 1, characterized in that: The eddy current slowing drum (4) is mounted on the drum support (8) via a shaft (9); the eddy current slowing drum (4) includes a brake disc (4-1), a drum (4-2), a magnetic yoke disc (4-3), a permanent magnet (4-4), and a wedge (4-5); the drum (4-2) constrains the wire rope through a groove and is fixed to the drum (4-2) by the wedge (4-5).

4. The overwind protection device for a deep well high-inertia hoisting container according to claim 1, characterized in that: The wire rope (2) drives the drum (4-2), which then begins to pull the wire rope (5) in the rope storage box (7). After a certain length of the wire rope (5) determined according to relevant principles has been pulled out, the friction overwind protection device (6) starts to work and completes the final braking.

5. The overwind protection device for a deep well high-inertia hoisting container according to claim 1, characterized in that: The friction-type overwind protection device (6) includes a roller (6-1), which drives the inner brake disc (6-3) and the outer brake disc (6-2) to brake the friction plate (6-6). The nut (6-7) drives the main shaft (6-4) to adjust the positive pressure on the friction plate (6-6). The support (6-5) provides support for the whole device.

6. The overwind protection device for a deep well high-inertia hoisting container according to claim 2, characterized in that: The crossbeam (1-1) is driven upward by the lifting container. The main pulley (1-3) on the crossbeam (1-1) drives the wire rope (2) upward. One end of the wire rope (2) is fixed to the connecting hole (10). The auxiliary pulleys (1-4) on both sides prevent the wire rope (2) from rubbing against the crossbeam (1-1) during the upward process. The main pulley (1-3) is equivalent to the movable pulley. When the height increases by one unit, the wire rope (2) will extend by two units, thereby the brake disc (4-1) will obtain two units of rotation speed and provide greater braking force.

7. The overwind protection device for a deep well high-inertia hoisting container according to claim 3, characterized in that: The magnetic yoke iron disk (4-3) is fixed on the mine headframe and has multiple magnet slots distributed according to the Halbach array. The permanent magnet (4-4) is fixed on the magnetic yoke iron disk.

8. The protection method for the overwind protection device of a deep well high-inertia hoisting container according to any one of claims 1-7 specifically includes the following steps: S1. Install and fix the overwind protection device of the hoisting system on the derrick, install permanent magnets (4-4) according to the Halbach array, adjust the length of the wire rope (5) in the rope storage box (7), adjust the preload provided by the nut (6-7) to complete the arrangement; S2. When an overwinding accident occurs in the lifting system, the lifting container drives the crossbeam (1-1) to continue moving upward. One end of the wire rope (2) is fixed to the connecting hole (10) and does not move. The other end passes through the auxiliary pulley (1-4), the main pulley (1-3), the auxiliary pulley (1-4), and then through the fixed pulley (3) to drive the drum (4-2) to rotate. Then the brake disc (4-1) starts to rotate, the permanent magnet (4-4) remains stationary, and the brake disc (4-1) performs the action of cutting the magnetic field lines to slow down the eddy current. At the same time, the wire ropes (5) on both sides of the drum (4-2) begin to converge. S3. After the lifting container is slowed down by the eddy current, its speed is greatly reduced, but it continues to move upward. When all the wire rope (5) in the rope storage box (7) is wound away by the drum (4-2), the wire rope (5) further drives the friction overwind protection device (6) to start braking. The drum (6-1) drives the inner brake disc (6-3) and the outer brake disc (6-2) to friction brake with the friction plate (6-6) to complete the final braking.

Images