Permanent magnet damping vibration attenuation device for ultra-deep well hoisting steel wire rope

Abstract

The invention discloses an ultra-deep well lifting steel wire rope permanent magnet damping vibration reduction device and a using method. A vibration reduction device body is composed of a transverse vibration traction device and a longitudinal guide rail sliding block device. According to the transverse vibration traction device, a steel wire rope and an inner ring are fixed together through a spiral clamping device, a permanent magnet is installed in a groove in the outer side of the inner ring through attraction force between a magnet yoke and the permanent magnet, and the permanent magnet is driven to move when the steel wire rope vibrates. A machine frame in the longitudinal guide rail sliding block device is installed in a mine sliding rail through cage shoes on the two sides of the machine frame, a conductor disc fixed to the machine frame and a permanent magnet moving transversely move relative to each other, formed eddy current will trigger changes of a secondary magnetic field and an impedance original magnetic field, and therefore transverse vibration of a steel wire rope is restrained. According to the device and the using method, transverse vibration of the steel wire rope in the deep well lifting process is reduced, kinetic energy of the steel wire rope is converted into heat energy on the conductor disc, the amplitude of the transverse vibration is reduced, and therefore safe and stable lifting and lowering of a lifting container are achieved.

Description

Technical Field

[0001] The present invention belongs to the field of safety protection of mine hoisting systems, and particularly relates to a permanent magnet damping vibration reduction device for hoisting steel ropes in ultra-deep mines and a usage method thereof. Background Technique

[0002] As a key component of China's diversified energy system, coal has long dominated the energy consumption structure and is one of the core driving forces for national economic development and social stability. However, with the gradual depletion of shallow and medium-shallow coal resources, deep mining (>1000 m) has become an inevitable strategic choice to ensure national energy security. According to statistics, the number of current kilometer-level deep mines in China has reached 53, and it is expected that the number of newly built and put-into-use ultra-kilometer deep coal mines will increase by more than 30 in the next decade. This trend will not only greatly expand the depth and scale of China's coal mining and lay a solid foundation for the national energy supply, but also pose new challenges to the coal industry, increasing the technical difficulty and safety risks during the mining process.

[0003] As the only transportation channel between the mine and the outside world, the hoisting system is an indispensable part of the mine mining process, and the stability of its core component, the steel rope, is directly related to the reliability of the entire hoisting system. With the continuous increase in the depth of mine mining, the environment where the steel rope is located becomes more complex and harsh, and the requirements for its reliability are also becoming more stringent. Although materials science is constantly advancing, the current technical level still makes it difficult to achieve a revolutionary improvement in the strength of steel rope materials. Therefore, how to reduce the damage suffered by the steel rope during hoisting has become an important direction for the technical development of the hoisting system.

[0004] During the actual hoisting process, the axial swing of the sheave is a common phenomenon. This swing will cause the lateral vibration of the steel rope, which will lead to a series of serious consequences. For example, the steel rope may collide with the rope string, which will not only damage the surface of the steel rope, but also may cause local stress concentration, accelerating the fatigue failure process. In addition, the lateral vibration may also cause a sudden change in the longitudinal vibration characteristics of the steel rope, making the dynamic behavior in the hoisting system complex and unstable. These factors are superimposed on each other, seriously affecting the stability of the steel rope during operation, reducing its service life, increasing the replacement frequency and maintenance cost.

[0005] At present, regarding the lateral vibration problem of wire ropes, the research in the academic and engineering fields mainly focuses on theoretical analysis and experimental measurement. Although scholars have achieved certain research results, in practical engineering applications, effective solutions are still limited. In engineering practice, common vibration reduction methods include using a multi-rope friction hoisting system. By optimizing the tension distribution of the wire ropes, the tension difference between the ropes is reduced, thereby indirectly reducing the amplitude of the lateral vibration of the wire ropes. In addition, changing the rope end fixing method and adjusting the support and restraint conditions of the wire ropes to reduce the lateral swing of the wire ropes are also commonly used means. However, most of these methods are indirect vibration reduction means, and the inhibitory effect on the lateral vibration of the wire ropes is limited.

[0006] As an advanced non-contact braking technology, the permanent magnet eddy current braking technology uses the eddy current generated when a conductive material moves in the magnetic field of a permanent magnet to resist the movement and achieve a smooth and wear-free braking effect. Compared with traditional vibration reduction devices, this technology not only has the advantages of simple and reliable structure and low maintenance requirements, but also can provide a more smooth and reliable braking force, significantly improving the overall safety. It is a vibration reduction technology with broad prospects and great influence.

[0007] Therefore, in view of the lateral vibration problem of wire ropes, the present invention innovatively proposes a permanent magnet damping vibration reduction device for wire ropes in ultra-deep well hoisting. Summary of the Invention

[0008] The purpose of the present invention is to provide a permanent magnet damping vibration reduction device for wire ropes in ultra-deep well hoisting and its usage method. The lateral vibration traction device in the device is fixed to the wire rope, and the longitudinal guide rail slider device is installed in the guide rail of the hoisting system. When the wire rope has lateral vibration, it will drive the permanent magnet in the lateral vibration traction device to move relative to the conductor disk in the longitudinal guide rail slider device, thereby generating an eddy current braking effect in the conductor disk and achieving effective vibration reduction of the wire rope.

[0009] To achieve the above purpose, the present invention adopts the following technical solutions: A permanent magnet damping vibration reduction device for wire ropes in ultra-deep well hoisting specifically includes two parts: a lateral vibration traction device and a longitudinal guide rail slider device. The inner ring in the lateral vibration traction device is fixed to the wire rope through a spiral clamping device and keeps the same frequency as the movement state of the wire rope; the sliding disk is installed on the support plate and serves as the contact surface with the longitudinal guide rail slider device; the permanent magnet is located on the bracket outside the inner ring to ensure that when the wire rope vibrates, the permanent magnet moves accordingly. The frame of the longitudinal guide rail slider device is installed in the slide rail of the mine hoisting system through the cage ears on both sides, and the conductor disk is installed on the frame and generates relative movement with the permanent magnet along with the vibration of the wire rope, thereby generating a braking force to inhibit the vibration of the wire rope.

[0010] The inner ring is divided into two symmetric left and right parts, and the support plate is used to connect the bracket and the screw clamping device. The screw clamping device is fixed to the wire rope by adding and tightening bolts through the bolt holes on both sides thereof. The bracket is used to fix the permanent magnet. The bottom of the yoke is provided with a bolt rod and is mounted on the bracket. The permanent magnet is placed on the yoke, and the longitudinal movement of the permanent magnet is restricted by the magnetic attraction force between the yoke and the permanent magnet. Meanwhile, the transverse movement of the permanent magnet is constrained by the baffle formed by the bracket, thereby realizing the fixation of the permanent magnet; by selecting different thicknesses of the mounted yoke, the air gap between the permanent magnet and the conductor disc can be adjusted to achieve a proper braking effect.

[0011] The frame is divided into upper and lower parts and is assembled by adding bolts through the connection holes around. A conductor disc and balls are installed in the frame. The conductor disc is provided with countersunk bolt holes, which can ensure that the transverse vibration traction device will not collide with the bolts during vibration and cause damage to the permanent magnet while connecting to the frame. The balls are embedded in the bosses in the frame. The balls serve as the connection points between the transverse vibration traction device and the longitudinal guide rail slider device, reducing the friction force on the sliding disc and enabling it to displace at any angle following the wire rope.

[0012] The using method of the permanent magnetic damping vibration reduction device for ultra-deep well hoisting wire rope is characterized in that: in the transverse vibration traction device, the screw clamping device wraps the wire rope at its center and is clamped and fixed by bolts, and the friction force between the two enables the screw clamping device to vibrate simultaneously therewith; the support plate connects the bracket and the screw clamping device. A yoke with a certain thickness is selected and installed on the bracket according to the required braking effect, and finally the permanent magnet is placed on the yoke to complete the installation of the transverse vibration traction device. In the longitudinal guide rail slider device, the conductor disc is installed on the frame by bolts, the balls are installed on the bosses of the frame, the tank ears on both sides of the device are installed in the mine slide rail, and finally the transverse vibration traction device is wrapped therein, and bolts are installed through the connection holes on the frame to complete the installation of the device. When the wire rope has transverse vibration, it drives the permanent magnet to move together, while the conductor disc is fixed on the frame and remains stationary horizontally, so that relative movement is generated between the two, generating resistance to the movement of the permanent magnet, thereby suppressing the vibration of the wire rope.

[0013] The present invention has the following beneficial effects: (1) Improve safety. It can effectively suppress the transverse vibration of the wire rope, reduce the risks such as collision and derailment caused by the swaying of the wire rope, reduce the possibility of fatigue fracture of the wire rope, ensure the safe operation of the mine hoisting system, prevent accidents, and protect the safety of personnel and equipment.

[0014] (2) Prolong the service life of the wire rope. Reduce the wear and local stress concentration of the wire rope during the transverse vibration process, alleviate the fatigue failure process, reduce the replacement frequency of the wire rope, save maintenance costs and replacement time, and improve the production efficiency of the mine.

[0015] (3) Adopt non-contact braking. The permanent magnet eddy current braking technology is adopted, which belongs to non-contact braking, avoiding the wear and maintenance problems caused by mechanical friction in traditional damping devices, improving the reliability and service life of the damping device, and reducing the maintenance workload and downtime.

[0016] (4) Simple structure and strong applicability. The device is designed simply, installed conveniently, and is easy to be integrated and transformed in the existing mine system. The ball design enables the device to displace at multiple angles along with the wire rope, with good versatility and adaptability to complex deep well environments. At the same time, adjusting the thickness of the magnetic yoke can flexibly change the braking intensity to meet the requirements of different scenarios.

[0017] (5) Energy-saving and environmental protection. During the permanent magnet eddy current braking process, no external energy supply is required, and the vibration kinetic energy of the wire rope is consumed in the conductor disk in the form of heat, meeting the requirements of energy-saving and environmental protection and reducing the energy consumption of the mine hoisting system. Brief Description of the Drawings

[0018] Figure 1 It is a schematic cross-sectional view of the permanent magnet damping vibration reduction device for the ultra-deep well hoisting wire rope of the present invention Figure 2 It is a schematic diagram of the transverse vibration traction device Figure 3 It is a schematic diagram of the longitudinal guide rail slider device In the figure: 11 - frame, 12 - ball, 13 - cage ear, 14 - conductor disk, 21 - inner ring, 22 - sliding disk, 23 - permanent magnet, 24 - wire rope, 25 - magnetic yoke, 111 - connection hole, 112 - boss, 211 - bracket, 212 - screw clamping device, 213 - support plate. Specific Embodiments

[0019] The present invention will be further described in detail below with reference to the drawings and specific embodiments.

[0020] As Figures 1 to 3 shown, a permanent magnet damping vibration reduction device for the ultra-deep well hoisting wire rope of the present invention includes two parts: a transverse vibration traction device and a longitudinal guide rail slider device.

[0021] In the transverse vibration traction device, the inner ring 21 is fixed on the steel wire rope 24 through the spiral clamping device 212 and keeps the same frequency as the motion state of the steel wire rope. The inner ring 21 is divided into two symmetric left and right parts, and the support plate 213 is used to connect the bracket 211 and the spiral clamping device 212. The spiral clamping device 212 is fixed to the steel wire rope 24 by adding and tightening bolts through the bolt holes on both sides thereof. The sliding disk 22 is installed on the support plate 213 and serves as the contact surface with the longitudinal guide rail slider device. The bracket 211 is used to fix the permanent magnet 23. The bottom of the yoke 25 is provided with a bolt rod and is installed on the bracket 211. The permanent magnet 23 is placed on the yoke 25. The longitudinal movement of the permanent magnet 23 is restricted by the magnetic attraction force between the yoke 25 and the permanent magnet 23, and at the same time, the transverse movement of the permanent magnet 23 is constrained by the baffle formed by the bracket 211, so as to fix the permanent magnet 23. By selecting different thicknesses of the installed yoke 25, the air gap between the permanent magnet 23 and the conductor disk 14 can be adjusted to achieve a proper braking effect.

[0022] The frame 11 of the longitudinal guide rail slider device is installed in the slide rail of the mine hoisting system through the tank ears 13 on both sides thereof. The conductor disk 14 is installed on the frame 11 and has a relative movement with the permanent magnet 23 along with the vibration of the steel wire rope 24, so as to generate a braking force to suppress the vibration of the steel wire rope 24. The frame 11 is divided into upper and lower parts and is assembled by adding bolts through the connection holes 111 around. The conductor disk 14 and the balls 12 are installed in the frame 11. The conductor disk 14 is provided with countersunk bolt holes, which can ensure that the transverse vibration traction device will not collide with the bolts during vibration and cause damage to the permanent magnet 23 while connecting with the frame 11. The balls 12 are embedded on the bosses 112 in the frame 11. The balls 12 serve as the connection points between the transverse vibration traction device and the longitudinal guide rail slider device, reducing the friction force on the sliding disk 22 and enabling it to displace at any angle following the steel wire rope 24.

[0023] On the other hand, the present invention also discloses a using method of the permanent magnet damping vibration reduction device for the ultra-deep well hoisting steel wire rope, including: The lateral vibration traction device is divided into left and right parts, and the longitudinal guide rail slider device is divided into upper and lower parts, showing a symmetrical distribution as a whole, which is more convenient for installation. In the lateral vibration traction device, the spiral clamping device 212 wraps the steel wire rope 24 at its center and is clamped and fixed by bolts. The frictional force between the two enables the spiral clamping device 212 to vibrate simultaneously with it; the support plate 213 connects the bracket 213 and the spiral clamping device 212 to form a connection body; according to the required braking effect, a yoke 25 with a certain thickness is selected and installed on the bracket 213 through the bolt rod at the tail end; finally, the permanent magnet 23 is adsorbed on the yoke 25 to complete the installation of the lateral vibration traction device. In the longitudinal guide rail slider device, the conductor disk 14 is installed on the frame 11 by bolts, and the ball 12 is installed on the boss 112 of the frame 11 to complete the installation of the internal parts; then the can lugs 13 on both sides of the device are installed in the mine slide rail, and finally the lateral vibration traction device is wrapped therein, and bolts are installed through the connection holes 111 on the frame 11 to fix the upper and lower parts of the device to complete the installation. When the steel wire rope 24 undergoes lateral vibration, the lateral vibration traction device drives the permanent magnet 23 to move together, while the conductor disk 14 is fixed on the frame 11 of the longitudinal guide rail slider device and remains stationary; the relative movement between the permanent magnet 23 and the conductor disk 14 will generate an eddy current braking effect, forming a resistance to the lateral movement of the permanent magnet 23; in this process, the kinetic energy of the lateral vibration of the steel wire rope 24 is converted into heat energy on the conductor disk 14, thus achieving the braking effect.

[0024] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A permanent magnet damping vibration reduction device for a steel wire rope for ultra-deep well hoisting, specifically comprising a transverse vibration traction device and a longitudinal guide rail slider device. In the transverse vibration traction device, an inner ring (21) is fixed to a steel wire rope (24) through a spiral clamping device (212) to keep the same frequency as the motion state of the steel wire rope; a sliding plate (22) is mounted on a support plate (213) as a contact surface with the longitudinal guide rail slider device; a permanent magnet (23) is located on a bracket (211) outside the inner ring (21) to ensure that when the steel wire rope (24) vibrates, the permanent magnet (23) moves accordingly. The frame (11) of the longitudinal guide rail slider device is mounted in a slide rail of a mine hoisting system through the tank ears (13) on both sides thereof; a conductor plate (14) is mounted on the frame (11) and generates relative motion with the permanent magnet (23) as the steel wire rope (24) vibrates, thereby generating a braking force to suppress the vibration of the steel wire rope (24).

2. The inner ring (21) as claimed in claim 1 is divided into two parts that are symmetrical to each other, and the bracket (211) and the spiral clamping device (212) are connected by a support plate (213).

3. The spiral clamping device (212) as described in claim 2 is fixed to the steel wire rope (24) by adding bolts and tightening them through the bolt holes on both sides thereof.

4. The bracket (211) as claimed in claim 2 is used to fix the permanent magnet (23), the bottom of the yoke (25) is provided with a bolt rod, which is installed on the bracket (211), and the permanent magnet (23) is placed on the yoke (25). The longitudinal movement of the permanent magnet (23) is limited by the magnetic attraction between the yoke (25) and the permanent magnet (23), and the baffle formed by the bracket (211) is used to constrain the lateral movement of the permanent magnet (23), thereby achieving the fixation of the permanent magnet (23); by selecting different thicknesses of the installed yoke (25), the air gap between the permanent magnet (23) and the conductor disk (14) can be adjusted to achieve a suitable braking effect.

5. The frame (11) as claimed in claim 1 is divided into two symmetrical parts, which are assembled by adding bolts through the connecting holes (111) around them. The conductor disc (14) and the ball (12) are installed in the frame (11).

6. The conductor disk (14) as claimed in claim 5 is provided with bolt countersunk holes, which are connected to the frame (11) and ensure that the lateral vibration traction device does not collide with the bolts during vibration, thereby causing damage to the permanent magnet (23).

7. The ball (12) as described in claim 5 is embedded in the boss (112) in the frame (11), and the ball (12) serves as a connection point between the lateral vibration traction device and the longitudinal guide rail slider device, reducing the friction force on the sliding plate (22) while allowing it to follow the wire rope (24) to move at any angle.

8. A method for using the permanent magnetic damping vibration reduction device for ultra-deep well hoisting wire rope according to claim 1, characterized in that: In the transverse vibration traction device, the spiral clamping device (212) wraps the steel wire rope (24) at its center and is clamped and fixed by bolts, and the friction between the two causes the spiral clamping device (212) to vibrate simultaneously with the steel wire rope; The support plate (213) connects the bracket (213) and the spiral clamping device (212), and a yoke (25) of a certain thickness is selected according to the required braking effect and installed on the bracket (213). Finally, the permanent magnet (23) is placed on the yoke (25) to complete the installation of the transverse vibration traction device. In the longitudinal guide rail slider device, the conductor disk (14) is installed on the frame (11) by bolts, the ball (12) is installed on the boss (112) of the frame (11), the tank ears (13) on both sides of the device are installed in the mine slide rail, and finally the transverse vibration traction device is wrapped therein, and bolts are installed through the connection holes (111) on the frame (11) to complete the installation of the device. When the steel wire rope (24) vibrates laterally, it drives the permanent magnet (23) to move together, while the conductor disk (14) is fixed on the frame and remains stationary in the laterally direction, so that the two generate relative movement, triggering the effect of eddy current braking, generating resistance to the movement of the permanent magnet, and thus playing a vibration reduction role on the vibration of the steel wire rope (24).

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