A retraction device

Abstract

This application discloses a retraction device, relating to the field of fully mechanized coal mining technology. The device includes: a main support; and a retraction assembly, which is located inside the main support. The retraction assembly includes an outer frame, a hydraulic cylinder, and a traction rope. This application replaces the traditional long wire rope traction of a winch with a short-distance traction rope driven by a hydraulic cylinder. Combined with a pulley block structure and a closed outer frame design, it significantly shortens the exposed section of the wire rope. Coupled with the overload protection mechanism of the pressure relief valve, it reduces the scope of rope breakage accidents from the source, lowering the risk of injury from slippage caused by wire rope breakage. Simultaneously, it enables single-person remote control operation using a remote control component, eliminating the high-intensity labor of multiple workers repeatedly carrying long wire ropes. Furthermore, the closed structure of the device allows for parallel operation at adjacent workstations, significantly improving the continuity and overall efficiency of retraction, and is particularly suitable for the safe and efficient retraction needs of heavy supports under complex roof pressure conditions.

Description

Technical Field

[0001] This application relates to the field of fully mechanized coal mining technology, and in particular to a retraction device. Background Technology

[0002] In the process of fully mechanized coal mining, large hydraulic supports are key equipment for ensuring the safety of the working face. When mining work in a certain area is completed, the hydraulic supports need to be safely and efficiently removed from the edge of the goaf so that they can be installed in the new coal mining face. Because hydraulic supports are huge and typically weigh more than 30 tons, they need to be dragged out of their original position with the help of external power.

[0003] Currently, the industry commonly uses fixed winches with long steel wire ropes to tow and remove hydraulic supports. While this method is technically mature, it has significant problems: First, the long steel wire rope is prone to friction and jamming with surrounding supports and other hard objects during towing, leading to wear, deformation, or even breakage. If the wire rope breaks, its enormous elastic energy is released instantly, posing a serious safety threat to personnel on site. Second, this method requires multiple workers to repeatedly manually move the heavy, long steel wire rope and connect it to the support to be removed, resulting in extremely high labor intensity and low efficiency. Furthermore, if a support is not removed promptly after being towed, it will obstruct the winch's steel wire rope traction path, affecting the continuous removal of subsequent supports and reducing overall efficiency. Therefore, the existing hydraulic support removal process has significant shortcomings in terms of safety, efficiency, labor intensity, and adaptability, and urgently needs improvement. Utility Model Content

[0004] In view of this, this application provides a retraction device, the main purpose of which is to solve the technical problems that the existing hydraulic support retraction process has obvious deficiencies in terms of safety, efficiency, labor intensity and adaptability.

[0005] This application provides a retraction device, comprising:

[0006] Main support;

[0007] A retraction assembly, wherein the retraction assembly is disposed inside the main support;

[0008] The retraction assembly includes an outer frame, a hydraulic cylinder, and a traction rope.

[0009] In one feasible implementation, the device further includes:

[0010] The first ear seat is disposed on the main support;

[0011] The second ear seat is disposed on the outer frame;

[0012] The outer frame is connected to the main support via the first ear and the second ear.

[0013] In one feasible implementation, the hydraulic cylinder is located inside the outer frame, and the extension and retraction direction of the piston rod of the hydraulic cylinder faces outward from the outer frame.

[0014] In one feasible implementation, one end of the traction rope is connected to the hydraulic cylinder, and the other end is connected to the hydraulic support to be retracted, wherein the hydraulic cylinder is used to drive the traction rope.

[0015] In one feasible implementation, the device further includes:

[0016] The first pulley is located inside the outer frame;

[0017] The second pulley is located inside the outer frame, and the traction rope is connected to the first pulley and the second pulley in sequence to form a pulley group structure.

[0018] In one feasible implementation, the first pulley is located at the end of the traction rope connected to the hydraulic cylinder, and the second pulley is located at the end of the traction rope connected to the hydraulic support to be retracted.

[0019] In one feasible implementation, the device further includes:

[0020] A fixing block, which is connected to the outer frame, is used to limit the end of the traction rope connected to the hydraulic support to be retracted.

[0021] In one feasible implementation, the device further includes:

[0022] A pressure relief valve is provided on the hydraulic cylinder.

[0023] In one feasible implementation, the device further includes:

[0024] A remote control component, which is connected to the retraction component.

[0025] In one feasible implementation, the remote control component includes:

[0026] A solenoid valve assembly, which is connected to the hydraulic cylinder;

[0027] A control line, one end of which is connected to the solenoid valve assembly;

[0028] A bracket controller, wherein the bracket controller is connected to the other end of the control line;

[0029] A wireless controller, which is connected to the solenoid valve assembly.

[0030] This application provides a retraction device, comprising: a main support; and a retraction assembly disposed inside the main support. The retraction assembly includes an outer frame, a hydraulic cylinder, and a traction rope. This application replaces the traditional long wire rope traction of a winch with a short-distance traction rope driven by a hydraulic cylinder. Combined with a pulley block structure and a closed outer frame design, it significantly shortens the exposed section of the wire rope. Coupled with the overload protection mechanism of the pressure relief valve, it reduces the scope of a rope breakage accident from the source, lowering the risk of injury from slippage caused by wire rope breakage. Simultaneously, the remote control component enables single-person remote operation, eliminating the need for multiple workers to repeatedly handle long wire ropes, drastically reducing the number of personnel required for retraction of a single support. Furthermore, the device's closed structure allows for parallel operation at adjacent workstations, compressing the retraction time of a single support and significantly improving the continuity and overall efficiency of retraction. It is particularly suitable for the safe and efficient retraction of heavy supports under complex roof pressure conditions.

[0031] Other features and advantages of this application will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the application. The objectives and other advantages of this application may be realized and obtained by means of the structures particularly pointed out in the written description, claims, and drawings.

[0032] The technical solution of this application will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0033] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0034] Figure 1 This paper shows a front view schematic diagram of a retraction device provided in an embodiment of this application;

[0035] Figure 2 This paper shows a top view of a retraction device according to an embodiment of the present application.

[0036] Figure 3 This illustration shows a schematic diagram of the left-side structure of a retraction device according to an embodiment of this application;

[0037] Figure 4 A schematic diagram of the structure of the remote control component provided in an embodiment of this application is shown.

[0038] In the picture:

[0039] 1. Outer frame; 2. Hydraulic cylinder; 3. Traction rope; 4. First pulley; 5. Second pulley; 6. Fixing block; 7. Pressure relief valve; 8. Main support. Detailed Implementation

[0040] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application 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. Therefore, they should not be construed as limitations on this application.

[0041] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0042] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., 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 between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0043] In fully mechanized coal mining faces, hydraulic supports are the core support equipment ensuring production safety and operational efficiency. They primarily perform two key functions: first, providing roof support for the coal mining area. Through their stable support structure composed of top beams and telescopic columns, they effectively isolate collapsing rock from the goaf and support the working face roof, creating necessary safety space for the safe operation of equipment such as coal mining machines and scraper conveyors, as well as for workers; second, enabling the forward movement of equipment on the working face. Their base and pushing mechanism coordinate to move forward in a step-by-step manner, driving the group of equipment forward in an orderly manner with the progress of coal mining. It is precisely the powerful support capabilities and automated moving characteristics of hydraulic supports that make them an indispensable basic equipment for high-yield and high-efficiency modern coal mining. However, when the mining area completes its excavation tasks and needs to be moved to a new working face, these massive, complex, and expensive hydraulic supports, typically weighing over 30 tons each, face the significant technical challenge of safely and efficiently withdrawing them from the narrow, complex edges of the original mining area where roof pressure exists. The currently widely used method of moving supports by using fixed winches and long steel wire ropes has been in use for a long time, but it has significant limitations in terms of safety, efficiency, labor intensity, and adaptability to heavy supports or complex working conditions. There is an urgent need for safer and more reliable alternative technologies.

[0044] See Figure 1 , Figure 2 and Figure 3 The diagram shows a structural schematic of a retraction device provided in an embodiment of this application, comprising:

[0045] Main support 8;

[0046] The retraction assembly is located inside the main support 8;

[0047] The retraction assembly includes an outer frame 1, a hydraulic cylinder 2, and a traction rope 3.

[0048] In the above embodiment, the main support 8 serves as the supporting foundation for the entire device, housing all the main components of the retraction assembly. The outer frame 1 is installed inside the main support 8, providing a stable mounting base and protective space for the hydraulic cylinder 2 and the wire rope drive system. The hydraulic cylinder 2 serves as the power source, with its cylinder body fixed to the outer frame 1. The extension and retraction of the piston rod provides traction force. The traction rope 3 is responsible for transmitting the traction force generated by the hydraulic cylinder to the hydraulic support to be retracted. This integrated design, by embedding the traction mechanism within the main support 8, makes the device compact, structurally sound, and easy to arrange and operate stably in confined downhole spaces.

[0049] This application integrates the retraction component within the main support 8, forming a complete, self-contained retraction unit. This design significantly reduces the need for additional, dispersed components such as winches and long wire ropes, simplifying equipment layout at the work site. The built-in retraction component is doubly protected by the main support 8 and the outer frame 1, reducing the risk of damage from falling rocks or collisions and improving equipment reliability. Simultaneously, the integrated structure facilitates installation and positioning, providing a structural foundation for subsequent remote automated operation.

[0050] Furthermore, the device also includes:

[0051] The first ear seat is located on the main support 8;

[0052] The second ear seat is located on the outer frame 1;

[0053] The outer frame 1 is connected to the main support 8 through the first ear seat and the second ear seat.

[0054] In the above embodiment, the first ear seat is a fixed ear seat, and the second ear seat is a connecting ear seat. The first ear seat is welded or bolted to a predetermined position on the main support 8, and the second ear seat is correspondingly disposed on the outer frame 1. A reliable connection between the outer frame 1 and the main support 8 is achieved by connecting parts such as pins or high-strength bolts passing through the connecting holes of the first and second ear seats. This ear seat connection method is a common and reliable mechanical connection method.

[0055] The ear-mount connection structure is simple and has high connection strength, reliably transmitting the action and reaction forces generated during the retraction operation. Simultaneously, this connection method allows for a certain installation tolerance between the outer frame 1 and the main support 8, facilitating on-site installation and commissioning. When maintenance is required, the connecting pins or bolts can be easily disassembled, allowing the retraction assembly to be removed entirely or partially, ensuring good maintainability.

[0056] Furthermore, the hydraulic cylinder 2 is located inside the outer frame 1, and the extension and retraction direction of the piston rod of the hydraulic cylinder 2 faces outward from the outer frame 1.

[0057] In the above embodiment, the hydraulic cylinder 2 is a push-pull hydraulic cylinder, and the cylinder body of the hydraulic cylinder 2 is fixedly installed on a pre-set base inside the outer frame 1 by a flange or pin. The extension and retraction direction of its piston rod is set to face and eventually extend out of the side wall opening of the outer frame 1 so as to be directly or indirectly connected to the traction rope 3. The inlet and outlet of the hydraulic cylinder are connected to an external hydraulic control system through high-pressure oil pipes.

[0058] This application integrates and fixes the hydraulic cylinder 2 within a robust outer frame 1, providing stable support during operation and preventing swaying or uneven loading during pushing and pulling, thus ensuring the linearity and stability of thrust transmission. The outward-facing piston rod design allows the power output direction to be directly aligned with the traction target, reducing unnecessary force transmission links and improving transmission efficiency. The enclosed frame structure also provides excellent protection for the hydraulic cylinder.

[0059] Furthermore, one end of the traction rope 3 is connected to the hydraulic cylinder 2, and the other end is connected to the hydraulic support to be retracted. The hydraulic cylinder 2 is used to drive the traction rope 3.

[0060] In the above embodiment, the traction rope 3 is a tension steel wire rope. The first end of the traction rope 3 is securely connected to the front end of the piston rod of the hydraulic cylinder 2 via a dedicated rope clamp, wedge joint, or pin connector. The other end extends beyond the outer frame 1 after passing through necessary pulleys for guidance, and is connected to a pull ring or connection point on the hydraulic support to be retracted via a shackle or connecting chain. When the piston rod of the hydraulic cylinder 2 extends, the hydraulic support to be retracted is moved by being pulled along the traction rope 3.

[0061] This application utilizes a hydraulic cylinder 2 to directly drive a short-distance traction rope 3, completely replacing the traditional winch wire rope that requires a long distance. The significant reduction in wire rope length greatly reduces the chances of interference and friction with surrounding supports and equipment during operation, thereby greatly lowering the risk of wire rope breakage due to wear and jamming, and improving inherent safety. At the same time, the shorter wire rope also avoids the need for manual long-distance handling of heavy wire ropes, reducing labor intensity.

[0062] Furthermore, the device also includes:

[0063] The first pulley 4 is located inside the outer frame 1;

[0064] The second pulley 5 is located inside the outer frame 1. The traction rope 3 is connected to the first pulley 4 and the second pulley 5 in sequence to form a pulley group structure.

[0065] In the above embodiment, the first pulley 4 is a movable pulley, and the second pulley 5 is a guide pulley. The first pulley 4 is installed inside the outer frame 1 via a pin, and its pulley groove is used to carry the traction rope 3. The second pulley 5 is also installed inside the outer frame 1 near the outlet via a bracket and a pin. The traction rope 3 starts from the end connected to the hydraulic cylinder 2, first passes around the first pulley 4, changes direction, then passes around the second pulley 5, and finally its free end is guided to the outlet and connected to the hydraulic support, thus forming a simple pulley system.

[0066] The introduction of the first pulley 4 in this application constitutes a labor-saving pulley block structure, allowing the hydraulic cylinder 2 to provide only a portion of the direct traction force to complete the dragging, reducing the thrust requirements of the hydraulic cylinder and allowing the use of smaller, lower-cost hydraulic cylinders, or equipment capable of dragging heavier equipment. The second pulley 5 ensures the accuracy of the wire rope's exit direction, enabling smooth extension and retraction, avoiding friction with the frame outlet, and extending the service life of the wire rope. The pulley block also effectively increases the effective working length of the wire rope, increasing the single traction distance of the support without changing the hydraulic cylinder stroke.

[0067] Furthermore, the first pulley 4 is located at the end where the traction rope 3 is connected to the oil cylinder 2, and the second pulley 5 is located at the end where the traction rope 3 is connected to the hydraulic support to be removed.

[0068] In the above embodiment, the first pulley 4 is positioned near the connection point of the piston rod of the hydraulic cylinder 2, i.e., the starting end of the wire rope under stress. The second pulley 5 is positioned near the free end outlet of the wire rope, i.e., the output end of the wire rope. This arrangement ensures that after the wire rope is led out from the connection point of the hydraulic cylinder piston rod, it immediately changes direction via the first pulley 4, and then the second pulley 5 guides it a second time before leading it out of the frame.

[0069] This application places the first pulley 4 at the force-bearing end, maximizing its labor-saving effect and optimizing the force transmission path. Placing the second pulley 5 at the output end allows for the most accurate final positioning and guidance of the wire rope about to exit the frame, ensuring the rope's exit direction aligns with the expected traction direction, reducing lateral forces, and making the traction process smoother. This clear division of areas results in a clear transmission path and maximum efficiency.

[0070] Furthermore, the device also includes:

[0071] Fixed block 6 is connected to the outer frame 1 and is used to limit the connection of the traction rope 3 to the hydraulic support to be removed.

[0072] In the above embodiment, the fixing block 6 is fixed to the side wall of the outer frame 1 by bolts or welding, and is usually located near the rope outlet of the second pulley 5. It has a U-shaped groove or through hole that matches the diameter of the wire rope. When the bracket needs to be replaced or when the machine is not in operation for a long time, the free end of the traction rope 3, that is, the end connected to the hydraulic bracket, can be inserted into or passed through the fixing block 6, and may be locked with a pin.

[0073] The fixing block 6 of this application provides a safe and reliable temporary fixing point. When a support is being retracted, awaiting transport, or when a temporary parking device is needed at the end of a shift, securing the wire rope end prevents it from slipping back into the frame due to its own weight or accidental external force, or even being dragged to the ground, thus avoiding contamination, damage, or tripping hazards to personnel. It also allows for the orderly storage of connectors at the wire rope end, facilitating quick access and connection next time.

[0074] Furthermore, the device also includes:

[0075] Pressure relief valve 7 is located on oil cylinder 2.

[0076] In the above embodiments, the pressure relief valve 7 is directly installed on the cylinder body of the hydraulic cylinder 2, or integrated into the hydraulic line near the oil inlet of the hydraulic cylinder, and its oil line is connected to the rodless chamber of the hydraulic cylinder. The opening pressure of the valve is preset to a safe value that is higher than the normal operating pressure of the system but lower than the maximum allowable pressure of the system.

[0077] The pressure relief valve 7 of this application provides a crucial overload protection function. When an accident occurs during traction, such as the support to be retracted becoming stuck, causing a sharp increase in traction resistance and resulting in the pressure in the hydraulic cylinder's working chamber exceeding the set value, the pressure relief valve 7 will automatically open to release pressure, stopping the hydraulic cylinder's operation. This effectively prevents serious accidents such as the traction rope 3 breaking, hydraulic cylinder damage, or even structural component damage caused by continuous overpressure, protecting the safety of equipment and personnel, and is a key measure to improve the inherent safety of the system.

[0078] Furthermore, the device also includes:

[0079] The remote control component is connected to the rollback component.

[0080] In the above embodiments, the remote control component is an electrical control system independent of the hydraulic system. Its output is connected to the actuator of the retraction component, while its input receives operator commands via wired or wireless means. This allows the operator to operate from a safe distance away from the retraction device and the support to be retracted.

[0081] This application enables remote operation via a remote control component, representing a significant improvement in safety. Operators no longer need to operate at close range near the traction path or in hazardous areas around the wire rope, completely eliminating potential injuries caused by accidents such as wire rope breakage, connection point detachment, or equipment swaying. Simultaneously, remote control improves the operating environment, allowing operators to have a better, safer view and perform precise operations.

[0082] See Figure 4The diagram illustrates the structure of a remote control component provided in an embodiment of this application. Further, the remote control component includes:

[0083] Solenoid valve assembly, which is connected to cylinder 2;

[0084] Control line, one end of which is connected to the solenoid valve assembly;

[0085] The bracket controller is connected to the other end of the control line;

[0086] Wireless controller, which is connected to the solenoid valve assembly.

[0087] In the above embodiment, the solenoid valve assembly is mounted on the hydraulic control valve block, directly controlling the hydraulic circuit leading to cylinder 2. The bracket controller is typically fixed to a nearby bracket, providing a local wired control interface; it connects to the solenoid valve assembly via a multi-core control cable. The wireless controller is a portable remote control that communicates with a receiver via radio signals, which is also connected to the solenoid valve assembly.

[0088] This application offers a variety of flexible control methods. Wired control offers high reliability and relatively low cost. Wireless remote control provides operators with maximum freedom of movement and the best viewing angle, allowing operation from the safest and most suitable location. The two methods serve as backups for each other, improving system reliability and adaptability. Operators can choose the safest and most effective control method to complete the retraction operation based on actual site conditions, such as ceiling conditions, equipment layout, and signal interference.

[0089] The present application provides a schematic diagram of the structure of a retraction device, including: a main support 8; a retraction assembly, which is located inside the main support 8; the retraction assembly includes an outer frame 1, a hydraulic cylinder 2 and a traction rope 3.

[0090] This application replaces the traditional long wire rope traction of winches with a short-distance traction rope driven by a hydraulic cylinder. Combined with a pulley block structure and a closed outer frame design, it significantly shortens the exposed section of the wire rope. With the overload protection mechanism of the pressure relief valve, it reduces the scope of the rope breakage accident from the source and lowers the risk of injury caused by the wire rope breaking. At the same time, it enables single-person remote control operation with the help of remote control components, eliminating the need for multiple workers to repeatedly carry long wire ropes. This greatly reduces the number of personnel required for the retraction of a single support. Furthermore, the closed structure of the device allows for parallel operation at adjacent workstations, compressing the retraction time of a single support and significantly improving the continuity and overall efficiency of the retraction. It is especially suitable for the safe and efficient retraction of heavy supports under complex roof pressure conditions.

[0091] Those skilled in the art will understand that the accompanying drawings are merely schematic diagrams of a preferred embodiment, and the modules or processes shown in the drawings are not necessarily essential for implementing this application. Those skilled in the art will understand that the modules in the apparatus of the embodiment can be distributed within the apparatus of the embodiment as described, or can be modified to be located in one or more apparatuses different from this embodiment. The modules of the above-described embodiment can be combined into one module, or further divided into multiple sub-modules.

[0092] The serial numbers in this application are for descriptive purposes only and do not represent the superiority or inferiority of any particular implementation scenario. The above disclosures are merely a few specific implementation scenarios of this application; however, this application is not limited thereto, and any variations conceived by those skilled in the art should fall within the protection scope of this application.

Claims

1. A retraction device, characterized in that, include: Main support (8); A retraction assembly is disposed inside the main support (8); The retraction assembly includes an outer frame (1), a hydraulic cylinder (2) and a traction rope (3). One end of the traction rope (3) is connected to the hydraulic cylinder (2), and the other end is connected to the hydraulic support to be retracted. The hydraulic cylinder (2) is used to drive the traction rope (3). The device further includes: The first pulley (4) is located inside the outer frame (1); The second pulley (5) is located inside the outer frame (1). The traction rope (3) is connected to the first pulley (4) and the second pulley (5) in sequence to form a pulley group structure. The first pulley (4) is located at the end of the traction rope (3) connected to the oil cylinder (2). The second pulley (5) is located at the end of the traction rope (3) connected to the hydraulic support to be removed. The device further includes: Pressure relief valve (7) is provided on the oil cylinder (2).

2. The apparatus of claim 1, wherein, The device further includes: The first ear seat is disposed on the main support (8); The second ear seat is disposed on the outer frame (1); The outer frame (1) is connected to the main support (8) through the first ear seat and the second ear seat.

3. The apparatus of claim 1, wherein, The hydraulic cylinder (2) is located inside the outer frame (1), and the extension and retraction direction of the piston rod of the hydraulic cylinder (2) is towards the outside of the outer frame (1).

4. The apparatus of claim 1, wherein, The device further includes: A fixing block (6) is connected to the outer frame (1) and is used to limit the end of the traction rope (3) connected to the hydraulic support to be removed.

5. The apparatus of claim 1, wherein, The device further includes: A remote control component, which is connected to the retraction component.

6. The apparatus of claim 5, wherein, The remote control component includes: A solenoid valve assembly, which is connected to the oil cylinder (2); A control line, one end of which is connected to the solenoid valve assembly; A bracket controller, wherein the bracket controller is connected to the other end of the control line; A wireless controller, which is connected to the solenoid valve assembly.

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