A retractable and recyclable constant resistance large deformation anchor cable constant resistance device

Abstract

This utility model discloses a retractable and recyclable constant resistance large deformation anchor cable constant resistance device. The constant resistance device includes a constant resistance device with a raised inner wall and a smooth inner wall from top to bottom; a small tray disposed on the outside of the constant resistance device and located between the raised inner wall and the smooth inner wall; a flat tray sleeved on the outside of the small tray; and a cable body disposed in the constant resistance device, one end of which passes through the bottom of the constant resistance device and is fitted with a locking device. The locking device has a locking device concave and convex inner wall, and a lock core is disposed in the locking device concave and convex inner wall. The inner side of the clamping plate of the lock cylinder has a concave and convex inner wall that abuts against the outer side of the cable body. The sleeve is sleeved on the outer side of the cable body and located between the lock and the constant resistor. The sleeve has a wedge-shaped frustum end, which is located in the constant resistor and cooperates with the protruding inner wall. This provides sufficient sliding amount for the constant resistor, ensuring that the lock will not enter the constant resistor. This realizes the anchor removal operation, allowing the constant resistor to be reused and reducing support costs.

Description

Technical Field

[0001] This utility model belongs to the field of mine support technology, specifically relating to a retractable and recoverable constant resistance large deformation anchor cable constant resistance device. Background Technology

[0002] In mine support operations, constant resistance large deformation anchor cables play a crucial role in ensuring roadway stability and guaranteeing coal mining safety. Traditional constant resistance structures employ specific methods to achieve large deformation extension of the anchor cable. This primarily relies on wedge-shaped locking devices to overcome the frictional force provided by the internal texture of the constant resistance cable to achieve a constant resistance value. Simultaneously, the constant resistance cable drives a small tray and a flat tray to slide downwards, thereby achieving the large deformation extension of the anchor cable.

[0003] However, when this traditional constant resistance device is applied to mine support operations, it reveals many problems that urgently need to be solved. On the one hand, under pressure, when the constant resistance device extends, the wedge lock will completely enter the inside of the constant resistance device, directly causing the wedge lock to be unable to perform the unanchoring operation. As a result, the constant resistance anchor cable cannot eliminate its working capacity. Especially after entering the goaf area in the goaf along the roadway, the support effect of the constant resistance anchor cable continues and cannot be eliminated. The roof is difficult to collapse under normal conditions, and a suspended roof phenomenon is very likely to form at the end of the working face. The existence of the suspended roof will hinder the normal dissipation of gas, leading to gas accumulation. This not only seriously threatens the life safety of mine workers, but also violates the clear requirements of the coal mine safety regulations, bringing great hidden dangers to coal mine safety production.

[0004] On the other hand, the constant resistance device has a large diameter and heavy weight, and is made of high-quality steel, which requires a lot of expensive steel in the production process. Since the wedge lock cannot perform the anchor removal operation, the old constant resistance device cannot be reused and can only be replaced with a new constant resistance device, resulting in high support costs and poor economic efficiency. Utility Model Content

[0005] The purpose of this utility model is to provide a retractable and recyclable constant resistance large deformation anchor cable constant resistance device to solve the technical defect in the prior art where, when the cable extends under pressure, the wedge lock will completely enter the constant resistance device, making it impossible to retract the wedge lock and thus preventing the constant resistance device from being reused.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A retractable and recoverable constant resistance large deformation anchor cable constant resistance device includes:

[0008] A constant resistor, which has a raised inner wall and a smooth inner wall from top to bottom;

[0009] The small tray is located outside the constant resistor and between the raised inner wall and the smooth inner wall;

[0010] A flat tray is fitted over the outside of the small tray;

[0011] A cable body is disposed in a constant resistor. One end of the cable body passes through the bottom of the constant resistor and is fitted with a lock. The lock has a concave and convex inner wall. A lock cylinder clip is provided in the concave and convex inner wall of the lock. The inner side of the lock cylinder clip is provided with a concave and convex inner wall of the lock cylinder clip. The concave and convex inner wall of the lock cylinder clip abuts against the outer side of the cable body.

[0012] A sleeve is fitted onto the outside of the cable body and located between the lock and the constant resistor. The sleeve has a wedge-shaped frustum end, which is located in the constant resistor and engages with the protruding inner wall.

[0013] Furthermore, the lock cylinder clip is provided in two parts, and the two lock cylinder clips are arranged symmetrically.

[0014] The two lock cylinder clips have lock cylinder grooves at the ends away from the sleeve. The lock cylinder grooves are located below the inner wall of the lock and away from the rope body. The two lock cylinder grooves are connected by a binding unit.

[0015] Furthermore, the cross-section of the lock cylinder clip is triangular, and a conical structure is formed between the two lock cylinder clips.

[0016] Furthermore, the two lock cylinder clips have the same structure.

[0017] Furthermore, one end of the lock cylinder clip with a lock cylinder groove abuts against the concave and convex inner wall of the lock.

[0018] Furthermore, the binding unit is iron wire.

[0019] Furthermore, the top of the lock cylinder clip abuts against the bottom of the sleeve.

[0020] Furthermore, the wedge-shaped frustum end is located in the constant resistor and abuts against the raised inner wall, and is located between the raised inner wall and the smooth inner wall.

[0021] Furthermore, the other end of the cable extends from the top of the constant resistor and is provided with a resin anchor solid.

[0022] Furthermore, the small tray is welded to the constant resistor.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] When using this constant resistance device for support operations, the synergistic effect of the sleeve and the protruding and smooth inner walls of the constant resistance device provides sufficient sliding space for the device, ensuring that the locking device will not enter the device. This enables the unanchoring operation, which not only prevents gas accumulation but also allows the constant resistance device to be reused, reducing the cost of mine support. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 A schematic diagram of a retractable and recyclable constant resistance large deformation anchor cable constant resistance device provided by this utility model;

[0027] Figure 2 A schematic diagram of the installation of the locking device and sleeve in a retractable and recyclable constant resistance large deformation anchor cable constant resistance device provided by this utility model;

[0028] Figure 3 This is a schematic diagram of existing technology.

[0029] The components are: 1. Cable body; 2. Anchor cable drill hole; 3. Resin anchor solid; 4. Small tray; 5. Flat tray; 6. Sleeve; 7. Lock; 8. Lock inner wall with concave and convex shapes; 9. Lock cylinder groove; 10. Lock cylinder clip; 11. Lock cylinder clip inner wall with concave and convex shapes; 12. Smooth inner wall; 13. Constant resistance; 14. Constant resistance drill hole; 15. Protruding inner wall; 16. Wedge lock; 17. Wedge lock cylinder clip. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0032] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0033] In the description of the embodiments of this utility model, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, they are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the utility model. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0034] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0035] In the description of the embodiments of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0036] To address the technical deficiencies mentioned in the background section, this embodiment provides a retractable, recyclable, constant-resistance, large-deformation anchor cable constant-resistance device. The following is a further detailed description of this utility model with reference to the accompanying drawings:

[0037] like Figures 1-2 As shown, a retractable and recyclable constant resistance large deformation anchor cable constant resistance device includes: a constant resistance device 13, which has a raised inner wall 15 and a smooth inner wall 12 arranged from top to bottom; wherein, the raised inner wall 15 is composed of multiple protrusions of different heights arranged alternately, and the smooth inner wall 12 is composed of multiple protrusions of the same height arranged sequentially.

[0038] Small tray 4 is located outside the constant resistor 13 and between the raised inner wall 15 and the smooth inner wall 12; flat tray 5 is fitted outside the small tray 4; cable 1 is located in the constant resistor 13, one end of the cable 1 passes through the bottom of the constant resistor 13 and is fitted with a lock 7, the lock 7 has a lock concave-convex inner wall 8, the lock cylinder clip 10 is provided in the lock concave-convex inner wall 8, the inner side of the lock cylinder clip 10 has a lock cylinder clip concave-convex inner wall 11, the lock cylinder clip concave-convex inner wall 11 abuts against the outside of the cable 1; sleeve 6 is fitted outside the cable 1 and is located between the lock 7 and the constant resistor 13, the sleeve 6 has a wedge-shaped frustum end, the wedge-shaped frustum end is located in the constant resistor 13 and cooperates with the raised inner wall 15 of the constant resistor 13, abuts against the raised inner wall 15, and is located between the raised inner wall 15 and the smooth inner wall 12.

[0039] When the supporting surrounding rock in the mine sinks and deforms, the constant resistance device 13 is driven to slide downward through the small tray 4 and the flat tray 5. During the downward movement of the constant resistance device 13, the wedge-shaped frustum end is affected by the downward force of the constant resistance device 13 and enters the constant resistance device 13. It then moves from the smooth inner wall 12 to below the raised inner wall 15 by sliding and comes into contact with the raised inner wall 15, thereby generating frictional resistance.

[0040] The frictional resistance provides constant resistance to the constant resistor 13. Meanwhile, as the wedge-shaped frustum end continues to move toward the center of the protruding inner wall 15, the constant resistor 13 continues to slide down along the guide of the cable body 1. During the slide, the cable body 1 extends downward and deforms, thereby ensuring that the lock 7 cannot enter the constant resistor 13.

[0041] When the support project is completed, a conventional anchor release device is used to release the constant resistor 13 with the wedge-shaped frustum end. Then, the anchored constant resistor 13 with the wedge-shaped frustum end can be reinstalled for use. If insufficient slippage is found before use, a short sleeve 6 is added between the sleeve 6 and the lock 7. The sleeve 6 can be of different lengths. By increasing the number of sleeves 6, the slippage of the constant resistor 13 can be restored twice. Increasing the number of sleeves 6 can also increase the slippage of the constant resistor 13, so that the extension of the constant resistor 13 does not decrease when reused.

[0042] like Figure 2 As shown, in practice, there are two lock cylinder clips 10, which are symmetrically arranged; among them, the ends of the two lock cylinder clips 10 away from the sleeve 6 are provided with lock cylinder grooves 9, which are located below the inner wall 8 of the lock and away from the rope body 1, and the two lock cylinder grooves 9 are connected by a binding unit.

[0043] In the above structure, two lock core clips 10 are symmetrically arranged around the cable body 1. When the cable body 1 is subjected to force, the tension on the cable body 1 can be evenly distributed to the two lock core clips 10. Through the action of the two lock core clips 10, the wedge-shaped frustum end can smoothly enter the constant resistor 13.

[0044] Lock cylinder grooves 9 are provided at the ends of the two lock cylinder clips 10 away from the sleeve 6 and connected by a binding unit. This facilitates the installation and adjustment of the lock cylinder clips 10 and enhances the coordination between the two lock cylinder clips 10. When subjected to external forces, the two lock cylinder clips 10 can support and restrain each other through the binding unit to jointly resist the external forces, thereby improving the overall strength and deformation resistance of the entire lock cylinder clip 10 structure. Even in complex mining environments, the stability of the lock cylinder clip 10 structure can be guaranteed, ensuring the normal operation of the anchor cable.

[0045] Specifically, the two lock cylinder clips 10 have the same structure. The cross-section of the lock cylinder clip 10 is triangular, and a conical structure is formed between the two lock cylinder clips 10. The conical structure ensures that the lock cylinder clips 10 will not easily loosen when subjected to vibration or impact.

[0046] Furthermore, the binding unit is made of iron wire. One end of the lock cylinder clamp 10 with the lock cylinder groove 9 abuts against the inner wall 8 of the lock, and the top of the lock cylinder clamp 10 abuts against the bottom of the sleeve 6. The iron wire, as the binding unit, effectively binds the two lock cylinder clamps 10 tightly together, preventing them from separating under external force. The abutment between the end of the lock cylinder clamp 10 with the lock cylinder groove 9 and the inner wall 8 of the lock restricts the lock cylinder clamp 10 in the axial direction, preventing it from moving upwards. Simultaneously, the top of the lock cylinder clamp 10 abuts against the bottom of the sleeve 6, further restricting the displacement of the lock cylinder clamp 10 in both the axial and radial directions.

[0047] In this design, the small tray 4 is welded to the constant resistor 13, and the other end of the cable 1 extends from the top of the constant resistor 13 and is provided with a resin anchor solid 3.

[0048] In this scheme, the retractable and recyclable constant resistance large deformation anchor cable constant resistance device is installed during the construction of the constant resistance anchor cable in the goaf-retention tunnel. First, a 32mm rock drill bit is used to drill the anchor cable borehole 2. Then, a 95mm diameter reaming drill bit is used to enlarge the lower 500mm section of the anchor cable borehole 2 into a constant resistance device borehole 14 with a diameter of 95mm.

[0049] Then, using the top of the constant resistance large deformation anchor cable body 1, resin anchoring agent is pushed into the top of the anchor cable borehole 2. Then, the anchor drilling machine is used to rotate the constant resistance large deformation anchor cable body 1 to stir the resin anchoring agent to form resin anchor solid 3. The top of the constant resistance large deformation anchor cable body 1 is fixed in the deep stable surrounding rock by the bonding effect of the resin anchor solid 3.

[0050] Next, the perforated small tray 4 and the flat tray 5 are placed on the constant resistor 13; the constant resistor 13 and the small tray 4 are fixed together by welding. Then, the small tray 4 and the constant resistor 13 with the flat tray 5 are sent into the drilled wall 14 of the constant resistor.

[0051] The cable body 1 of the constant resistance large deformation anchor cable is inserted into the sleeve 6 and the lock 7. Then, the lock core clip 10 is inserted into the lock 7, and the lock core groove 9 is wrapped with iron wire so that the lock core clip 10 forms a conical whole. Then, the top of the tension jack is used to squeeze the lock core clip 10 into the lock 7 and push the sleeve 6 into the constant resistance device 13 until a certain pre-tightening force is reached. Then, the lock core clip 10 fixes the lock 7 in a certain position in the constant resistance device 13.

[0052] Then, after removing the tensioning jacks and installing the constant resistance anchor cables, as the roof of the working tunnel sinks, the surrounding rock of the roof will squeeze the flat tray 5 and drive the small tray 4 welded to the lower part of the constant resistance device 13. The small tray 4 welded to the lower part of the constant resistance device 13 will drive the constant resistance device 13 to move downward. When the constant resistance device 13 slides downward as a whole, the protruding inner wall 15 will rub against the sleeve 6, generating frictional resistance. The frictional resistance will provide constant resistance for the constant resistance device 13.

[0053] Meanwhile, as the protruding inner wall 15 is continuously overcome, the constant resistance device 13 slides downward along the cable body 1 of the constant resistance large deformation anchor cable, realizing the sliding of the constant resistance device 13 and the extension deformation of the constant resistance large deformation anchor cable. At the same time, the lock 7 does not enter the constant resistance device 13, keeping the lock 7 exposed.

[0054] After the roof of the goaf-retaining roadway is completed and before the goaf collapses, the locking device 7 is removed using a conventional anchor removal device. Then, the constant resistance device 13, which contains the sleeve 6 that has slipped, is removed in sequence. When constructing new anchor holes, the constant resistance device 13 containing the sleeve 6 is reinstalled. If the slippage is insufficient, a short sleeve 6 is added between the sleeve 6 and the locking device 7. The sleeves 6 are of different lengths. By increasing the number of sleeves 6, the slippage of the constant resistance device 13 can be restored. Increasing the number of sleeves 6 can also increase the slippage of the constant resistance device 13, so that the extension of the constant resistance device 13 does not decrease when reused.

[0055] In the prior art, the installation positions of the wedge-shaped lock 16 and the wedge-shaped lock cylinder clip 17 on the constant resistor 13 are as follows: Figure 3As shown, under pressure, when the constant resistance device 13 extends, the wedge lock 16 will completely enter the interior of the constant resistance device 13, directly causing the wedge lock core clip 17 to be unable to perform the anchoring operation, thus making it impossible for the constant resistance anchor cable to eliminate its working capacity. Especially after entering the goaf area along the goaf, the support effect of the constant resistance anchor cable continues and cannot be eliminated.

[0056] The retractable and recyclable constant resistance large deformation anchor cable constant resistance device using this solution solves the problem that when the lock enters the constant resistance device during operation, the lock cannot be retracted. It realizes the effect of retractable and recyclable constant resistance large deformation anchor cable constant resistance device, and solves the problem of suspended top caused by the inability to retract the anchor and the high cost caused by the inability to reuse it. It is both safe and economical.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit its protection scope. Although the utility model has been described in detail with reference to the above embodiments, those skilled in the art should understand that after reading this utility model, they can still make various changes, modifications or equivalent substitutions to the specific implementation of the utility model, but these changes, modifications or equivalent substitutions are all within the protection scope of the pending claims of the utility model.

Claims

1. A constant resistance large deformation anchor cable constant resistance device capable of being withdrawn and recycled, characterized in that, include: A constant resistor, which has a raised inner wall and a smooth inner wall from top to bottom; The small tray is positioned outside the constant resistor and between the raised inner wall and the smooth inner wall; A flat tray is fitted over the outside of the small tray; A cable body is disposed in a constant resistor. One end of the cable body passes through the bottom of the constant resistor and is fitted with a lock. The lock has a concave and convex inner wall. A lock cylinder clip is provided in the concave and convex inner wall of the lock. The inner side of the lock cylinder clip is provided with a concave and convex inner wall of the lock cylinder clip. The concave and convex inner wall of the lock cylinder clip abuts against the outer side of the cable body. A sleeve is fitted onto the outside of the cable body and located between the lock and the constant resistor. The sleeve has a wedge-shaped frustum end, which is located in the constant resistor and engages with the protruding inner wall.

2. The constant resistance large deformation anchor constant resistance device of claim 1, wherein, The lock cylinder clip is provided in two symmetrical arrangements. Two lock cylinder clips have lock cylinder grooves at their ends away from the sleeve. The lock cylinder grooves are located below the inner wall of the lock and away from the rope body. The two lock cylinder grooves are connected by a binding unit.

3. A constant resistance retrievable anchor according to claim 2, wherein, The cross-section of the lock cylinder clip is triangular, and a conical structure is formed between the two lock cylinder clips.

4. The constant resistance large deformation anchor constant resistance device of claim 3, wherein, The two lock cylinder clips have the same structure.

5. The constant resistance large deformation anchor constant resistance device of claim 2, wherein, The end of the lock cylinder clip with the lock cylinder groove abuts against the concave and convex inner wall of the lock.

6. A constant resistance retrievable anchor according to claim 2, wherein, The binding unit is made of iron wire.

7. The retractable and recoverable constant resistance large deformation anchor cable constant resistance device according to claim 1, characterized in that, The top of the lock cylinder clip abuts against the bottom of the sleeve.

8. The retractable and recoverable constant resistance large deformation anchor cable constant resistance device according to claim 1, characterized in that, The wedge-shaped frustum end is located in the constant resistor and abuts against the raised inner wall, and is located between the raised inner wall and the smooth inner wall.

9. The retractable and recoverable constant resistance large deformation anchor cable constant resistance device according to claim 1, characterized in that, The other end of the cable extends from the top of the constant resistor and is provided with a resin anchor solid.

10. The retractable and recoverable constant resistance large deformation anchor cable constant resistance device according to claim 1, characterized in that, The small tray is welded to the constant resistor.

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