Combined device for dismantling cylinder bottom valve in hydraulic stand column

Abstract

The combined device comprises a main handle, a pressure relief mechanism, a screwing mechanism and a drawing mechanism, the pressure relief mechanism comprises a pressure plate and a clamping assembly, the pressure plate is fixedly installed at the front end of the main handle, and the end of the main handle and the bottom of a middle cylinder are movably clamped together through the clamping assembly; the screwing mechanism comprises a chuck, bolts and a center column, the center column and the chuck are installed on the upper end face and the lower end face of the middle of the main handle respectively, and the two bolts are symmetrically arranged at the bottom of the chuck. The drawing mechanism comprises a rotating plate, a U-shaped supporting seat, a stud, a drawing plate and a bottom valve connecting piece; the stud is vertically mounted at the top of the central column, the drawing plate, the U-shaped supporting seat and the rotating plate are sequentially mounted on the stud in a sleeving manner, and the rotating plate is in threaded connection with the main bolt; the hydraulic stand column bottom valve dismounting device is unique in structure and ingenious in design, and the problems that an existing hydraulic stand column bottom valve dismounting device is scattered, complex in operation, high in safety risk and poor in adaptability can be effectively solved.

Description

Technical Field

[0001] This invention belongs to the field of hydraulic column cylinder disassembly technology, specifically relating to a combined device for disassembling the bottom valve of a hydraulic column cylinder. Background Technology

[0002] Hydraulic double telescopic columns, as the core power supply unit in underground coal seam mining, mainly consist of an outer cylinder, a middle cylinder, a piston, and hydraulic control components. The column extends and retracts via the flow of hydraulic oil, bearing the load of roof support. After a certain service life, they typically require maintenance or replacement. When maintaining the column, the bottom valve must be removed to clean internal impurities and replace damaged parts. Therefore, bottom valve removal is a crucial preliminary step in column maintenance, directly determining maintenance efficiency and the quality of column reuse. The safe procedure for removing the bottom valve is first to release the internal pressure, then to unscrew the plug, and finally to remove the bottom valve before proceeding with the disassembly of the middle cylinder and piston. If the pressure is not released or is not fully released, and the bottom valve plug is unscrewed directly, the bottom valve will fly out like a cannonball, posing a significant operational risk to workers.

[0003] Currently, the disassembly of the bottom valve in column maintenance generally adopts a "dispersed tool combination operation" mode. When depressurizing, a simple metal jack or homemade pry bar is used to manually push the valve core to release pressure. When removing the plug, the corresponding tool is required, and the plug is tightened manually. If the plug is corroded, an additional lever is needed to increase the torque. When pulling out the bottom valve, tools such as needle-nose pliers are used. The needle-nose pliers are inserted into the hole at the bottom of the bottom valve to pull it out. This disassembly mode uses dispersed tools, requires frequent tool changes between processes, and has cumbersome operation steps. Not only is there no standardized fulcrum during the depressurization stage, but the jack is also prone to slippage due to uneven force when manually pushing it. Moreover, the bottom valve is also prone to slippage when being pulled out. The operation is risky and inefficient, and cannot meet the needs of efficient maintenance of multi-specification hydraulic double telescopic columns. Summary of the Invention

[0004] To address the shortcomings and problems of existing hydraulic column bottom valve removal devices, this invention provides a combined device for removing the bottom valve of a hydraulic column cylinder. This device has a unique structure and ingenious design, which can effectively solve the problems of existing hydraulic column bottom valve removal devices being scattered, complex to operate, having high safety risks, and poor adaptability. It enables rapid and safe pressure relief and disassembly of various types of column bottom valves, improving maintenance efficiency.

[0005] The solution adopted by this invention to solve its technical problem is: a combined device for removing the bottom valve of a hydraulic column cylinder, comprising a main handle, a pressure relief mechanism, a screwing mechanism, and a pulling mechanism. The pressure relief mechanism includes a pressure plate and a clamping assembly. The pressure plate is fixedly installed at the front end of the main handle. The end of the main handle on the same side as the pressure plate is movably clamped to the bottom of the cylinder via the clamping assembly, and the end of the main handle can drive the pressure plate to push the bottom valve core with the clamping part as a fulcrum. The screwing mechanism includes a chuck, a pin, and a central column. The central column and the chuck are respectively installed on the upper and lower end faces of the middle part of the main handle. Two pins are symmetrically arranged at the bottom of the chuck. The device includes two pins that can be inserted into the corresponding inner holes of the bottom valve plug. The pulling mechanism includes a rotary plate, a U-shaped support, a stud, a pulling plate, and a bottom valve connector. The stud is vertically mounted on the top of the central column, and the top of the stud is equipped with an anti-dislodgement cap. The U-shaped support is vertically slidably mounted on the stud, with the U-shaped support facing upwards, and can support the bottom of the middle cylinder on both sides of the bottom valve. The pulling plate is vertically slidably mounted on the stud inside the U-shaped support and is detachably connected to the bottom of the bottom valve through the bottom valve connector. The rotary plate is mounted on the main bolt below the U-shaped support and is threadedly connected to the main bolt.

[0006] The rotary plate includes a rotary plate body, a through hole in the middle of the rotary plate body, and a pull nut is fixedly installed thereon. The pull nut is threaded onto the stud.

[0007] The two ends of the pull plate extend outward to form U-shaped support seats and are symmetrically provided with through holes. The bottom valve connector includes pull bolts symmetrically inserted into the through holes at both ends of the pull plate. The pull bolts are arranged facing upward and are used to connect the pull plate and the bottom valve by threaded engagement with the threaded hole at the bottom of the bottom valve.

[0008] One end of the U-shaped support extending from either end of the drawing plate is fan-shaped. The fan-shaped plate segment has multiple through holes along the circumferential direction with the screw as the axis, for installing the drawing bolt.

[0009] The through hole is a strip-shaped hole arranged radially along the screw.

[0010] The mounting assembly includes a mounting support handle and a fulcrum bolt. The fulcrum bolt is threaded into the lifting hole at the bottom of the middle cylinder. The mounting support handle includes a support rod, a U-shaped clamp, and a locking fastener. The support rod is slidably mounted vertically on the main handle on the same side of the pressure plate and is locked to the main handle by the locking fastener. The U-shaped clamp is mounted on the top of the support rod and can be clamped onto the threaded rod of the fulcrum bolt, abutting against the nut of the fulcrum bolt.

[0011] The central column includes a vertical column, an outer sleeve and the vertical column are vertically installed in the middle of the main handle, a pulling mechanism is installed on the top of the vertical column, and the outer sleeve is rotatably installed on the vertical column below the pulling mechanism.

[0012] The pressure relief mechanism also includes a movable handle, which includes a handle rod and a locking pin. The handle rod is hinged to the end of the main handle and is secured to the main handle by the locking pin.

[0013] The stud and the anti-detachment cap are an integral structure.

[0014] The bottom end of the stud is detachably connected to the top end of the central post.

[0015] The beneficial effects of this invention are as follows: This invention provides a combined device for removing the bottom valve of a hydraulic column, integrating three main functions: pressure relief, screwing, and pulling, achieving a continuous operation of "one relief, two screwing, and three pulling." Users do not need to change tools midway, simplifying the bottom valve removal process from the traditional multi-step procedure to a standardized three-step process, significantly improving maintenance efficiency. The device, through its adjustable design including a support rod length adjustment, precise matching of the pin and plug inner hole, and U-shaped support seat sliding adjustment, can accommodate different cylinder diameter requirements of various hydraulic column models, eliminating the need for custom-made tools for different specifications and greatly reducing maintenance costs. The pressure relief mechanism adopts a design where the support rod axis is perpendicular to the pressure plate axis, ensuring accuracy when the pressure plate pushes the valve core, avoiding safety risks such as hydraulic oil splashing and valve core damage that may occur in traditional methods. Meanwhile, the pulling mechanism ensures uniform force distribution, completely solving the problem of easy slippage when pulling the bottom valve; the design of the movable handle allows the effective length of the main handle to be adjusted according to actual needs, which can provide a more effortless operation when turning, or be used as an extension when greater force is required, improving the convenience and flexibility of operation. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural schematic diagram of the present invention.

[0017] Figure 2 This is a schematic diagram of the mounting component structure of the present invention.

[0018] Figure 3 This is a schematic diagram of the movable handle structure of the present invention.

[0019] Figure 4 This is a schematic diagram of the pulling mechanism structure of the present invention.

[0020] Figure 5 This is a schematic diagram of the screwing mechanism of the present invention.

[0021] Figure 6 This is a schematic diagram of the connection between the pulling mechanism and the bottom valve of the present invention.

[0022] Figure 7 This is a schematic diagram of the mounting support of the mounting component of the present invention.

[0023] Figure 8This is a schematic diagram of the screwing mechanism and the bottom valve plug of the present invention.

[0024] The diagram labels are as follows: 1 is the main handle; 11 is the sliding hole; 12 is the mounting groove; 13 is the insertion hole; 2 is the pressure plate; 3 is the mounting support handle; 31 is the support rod; 32 is the U-shaped chuck; 33 is the locking fastener; 4 is the fulcrum bolt; 5 is the tightening mechanism; 51 is the chuck; 52 is the pin; 53 is the center column; 54 is the connecting column; 6 is the movable handle; 61 is the handle rod; 62 is the locking pin; 63 is the pin shaft; 64 is the handle seat; 641 is the pin hole; 642 is the pin shaft hole; 7 is the pulling mechanism; 71 is the rotating plate; 711 is the tightening plate body; 712 is the pulling nut; 72 is the U-shaped support seat; 73 is the stud; 74 is the anti-dislodgement cap; 75 is the pulling plate; 76 is the pulling bolt; 8 is the bottom valve; 81 is the threaded hole; 9 is the middle cylinder; 91 is the lifting hole; 92 is the bottom valve plug. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments. Example

[0026] This embodiment provides a combined device for removing the bottom valve of a hydraulic column cylinder, such as... Figure 1-8 As shown, it includes a main handle 1, a pressure relief mechanism, a screwing mechanism 5, and a pulling mechanism 7. The main handle 1 has a rod-type structure. The pressure relief mechanism includes a pressure plate 2 and a clamping assembly. The pressure plate 2 is fixedly installed at the front end of the main handle 1. The end of the main handle 1 on the same side of the pressure plate 2 is movably clamped to the bottom of the middle cylinder 9 through the clamping assembly. The end of the main handle 1 can drive the pressure plate 2 to push the valve core of the bottom valve 8 with the clamping part as the fulcrum. Specifically: like Figure 2 As shown, the mounting assembly includes a mounting support handle 3 and a fulcrum bolt 4. The fulcrum bolt 4 is threaded into the lifting hole 91 at the bottom of the middle cylinder 9, and a threaded section is reserved between the nut of the fulcrum bolt 4 and the bottom of the cylinder to serve as a mounting support point for the mounting support handle 3. The pressure plate 2 is welded to the front end of the main handle 1. The end face of the pressure plate 2 away from the main handle 1 is provided with a force-bearing surface adapted to the valve core, which is used to push the valve core of the bottom valve 8 to relieve its pressure. The mounting support handle 3 includes a support rod 31, a U-shaped clamping head 32, and a locking fastener 33. The front end of the main handle 1 is provided with a vertical sliding hole 11, and one side of the main handle 1 is provided with a... The threaded hole communicating with the sliding hole 11 allows the support rod 31 to slide vertically within the sliding hole 11. The locking fastener 33 is a locking bolt, which is matched and installed in the threaded hole to lock the support rod 31 together with the main handle 1. When in use, the locking bolt can be loosened to adjust the length of the support handle to match different cylinder diameters. The central axis of the support rod 31 is perpendicular to the central axis of the pressure plate 2. The U-shaped clamp 32 is installed on the top of the support rod 31 and can be clamped on the screw of the fulcrum bolt 4 and abut against the nut of the fulcrum bolt 4.

[0027] When depressurizing, first install the fulcrum bolt 4 threaded into the bottom lifting hole 91 of the middle cylinder 9, then loosen the locking bolt and adjust the extension length of the support rod 31 according to the distance between the bottom lifting hole 91 of the middle cylinder 9 and the central axis of the bottom valve 8. Then, clamp the U-shaped chuck 32 onto the thread of the fulcrum bolt 4 and make it abut against the nut of the fulcrum bolt 4, so that the pressure plate 2 abuts against the valve core of the bottom valve 8. Then, turn the end of the main handle 1 away from the pressure plate 2. The main handle 1, through the U-shaped chuck 32 and with the nut of the fulcrum bolt 4 as the lever fulcrum, drives the pressure plate 2 to push the valve core of the bottom valve 8 to depressurize.

[0028] The pressure relief mechanism uses the fulcrum bolt 4, which is threaded into the bottom lifting hole 91 of the middle cylinder 9, as the lever fulcrum. Combined with the structure of "support rod 31 vertically adjusting and locking along the main handle 1", it can flexibly adapt to the distance between the bottom lifting hole 91 of the middle cylinder 9 and the central axis of the bottom valve 8 according to different cylinder diameters, thus solving the problem of "poor adaptability". On the other hand, the axis of the support rod 31 is perpendicular to the axis of the pressure plate 2, ensuring that the pressure plate 2 accurately pushes the valve core, avoiding the safety risks such as hydraulic oil splashing and valve core damage caused by unstable pushing during traditional pressure relief, thus achieving "safe pressure relief".

[0029] The screwing mechanism 5 includes a chuck 51, pins 52, and a center post 53. The chuck 51 is welded or bolted to the bottom surface of the middle part of the main handle 1. The center post 53 is vertically welded to the upper end surface of the middle part of the main handle 1, and the center post 53 is coaxially arranged with the chuck 51. Two pins 52 are symmetrically arranged at the bottom of the chuck 51 with the central axis of the chuck 51 as the center. The pins 52 are welded to the chuck 51. The two pins 52 can be inserted into the corresponding inner holes of the bottom valve plug. Specifically, the pins 52 have a cylindrical cross-section, and the top of the pins 52 is rounded to avoid scratching the inner holes. The center distance between the two pins 52 is equal to the center distance between the two inner holes at the bottom of the plug, ensuring that the two pins 52 can be inserted into different inner holes of the bottom valve plug 92. Figure 8 As shown, when disassembling the bottom valve plug, after aligning the chuck 51 with the bottom valve plug 92, insert the two pins 52 into the corresponding inner holes of the bottom valve plug 92. Then, hold the mounting support handle 3 installed at the front end of the main handle 1 and the central column 53 in the middle, and push and pull the mounting support handle 33 with the central column 53 as the center to drive the main handle 1 to rotate the chuck 51, thereby unscrewing or tightening the bottom valve plug.

[0030] When tightening the plug, the pins 52 symmetrically arranged at the bottom of the chuck 51 precisely match the two inner holes of the bottom valve plug head. By "holding and clamping the support handle 3 + center post 53" and pushing and pulling around the center post 53 as the axis, the plug can be tightened efficiently without the need for additional tools (such as a lever). This solves the pain points of traditional wrenches, such as "difficulty in applying force and easy slippage". It simplifies the operation, avoids damage to the plug head, further reduces safety risks and improves disassembly efficiency.

[0031] Furthermore, the central column 53 includes a column and an outer sleeve. The column is vertically welded and installed in the middle of the main handle 1. The pulling mechanism 7 is installed on the top of the column. The outer sleeve is rotatably installed on the column below the pulling mechanism 7. When disassembling the bottom valve plug, after loosening the bottom valve plug, the outer sleeve can be gripped and rotated quickly to quickly disassemble the bottom valve plug.

[0032] The pulling mechanism 7 includes a rotating plate 71, a U-shaped support 72, a stud 73, a pulling plate 75, and a bottom valve 8 connector. The stud 73 is vertically mounted on the top of the central column 53, and the top of the stud 73 is provided with an anti-detachment cap 74 to prevent the pulling plate 75 from detaching from the stud 73. In this embodiment, the stud 73 and the anti-detachment cap 74 are an integral structure. There are various ways to connect the stud 73 and the central column 53, such as the stud 73 being directly welded to the central column 53, or the top of the central column 53 being provided with a connecting post, and the top of the connecting post 54 being provided with a threaded hole. The bottom of the stud 73 is fitted into the threaded hole at the top of the connecting column 54, so that the stud 73 and the center column 53 are detachably connected by threads. The U-shaped support 72 is slidably fitted on the stud 73 along the vertical direction, and the U-shaped support 72 is set upward, and can support the bottom of the middle cylinder 9 on both sides of the bottom valve 8. Furthermore, the outer end face of the two vertical plates of the U-shaped support 72 is provided with an extension plate vertically. The extension length of the extension plate is adapted to the bottom valve 8 mounting groove of the bottom of the middle cylinder 9 of different sizes (especially large sizes), so as to ensure that the U-shaped support can stably support the bottom of the middle cylinder 9 of different specifications.

[0033] The drawing plate 75 has a guide hole in the middle along the vertical direction and is slidably mounted on the stud 73 above the U-shaped support 72. The drawing plate 75 is detachably connected to the bottom of the bottom valve 8 through the bottom valve 8 connector; and the width of the drawing plate 75 is smaller than the distance between the two vertical plates of the U-shaped support 72. The rotating plate 71 is fitted onto the main bolt below the U-shaped support 72 and is threadedly connected to the main bolt. Specifically: The rotating plate 71 includes a rotating plate body 711, with a through hole in the middle and a pull nut 712 fixedly installed thereon. The pull nut 712 is threaded onto a stud 73. Both ends of the pull plate 75 extend outwards into U-shaped support seats 72, with symmetrical through holes. The bottom valve 8 connector includes pull bolts 76 symmetrically inserted into the through holes at both ends of the pull plate. The pull bolts 76 are upwardly positioned and used to thread into the threaded holes 81 at the bottom of the bottom valve 8 to pull the plate 71. 5. Connect to bottom valve 8; When pulling and disassembling bottom valve 8, first connect pull plate 75 to bottom valve 8 with two pull bolts 76, then drive U-shaped support seat 72 upward by turning the rotating plate 71. When U-shaped support seat 72 abuts against the bottom of the middle cylinder 9 on both sides of bottom valve 8, continue to drive rotating plate 71 to move upward along stud 73. Rotating plate 71 will pull stud 73 downward and drive pull plate 75 downward through anti-disengagement cap 74, thereby pulling and disassembling bottom valve 8.

[0034] Furthermore, the end of the pull plate extending to the right into a U-shaped support is fan-shaped. The fan-shaped plate segment has multiple through holes along the circumferential direction with the screw as the axis, for installing pull bolts. In this embodiment, the fan-shaped plate segment has 3 through holes along the circumferential direction with the screw as the axis. The through hole in the middle of the fan-shaped plate is symmetrically arranged with the through hole at the left end of the pull plate. The angle between the two through holes on the outer side of the fan-shaped plate is 120°. Thus, when in use, the pull plate can be adapted to a bottom valve with 2 threaded holes symmetrically distributed at 180° or 3 threaded holes evenly distributed at 120°.

[0035] The pulling mechanism 7, through the cooperation of "stud 73 + sliding U-shaped support seat + pulling plate 75 with pulling bolt 76 + rotating plate 71", can drive the U-shaped support seat to press against the bottom of the middle cylinder 9 by turning the rotating plate 71, and pull the pulling plate 75 to drive the bottom valve 8 to move down at a uniform speed, so as to achieve uniform pulling force and completely solve the safety hazards of "uneven force causing deformation of bottom valve 8 and damage to the bottom of middle cylinder 9" in traditional pullers; at the same time, the structure is compact and does not require additional space for installation, making it suitable for narrow maintenance environments on site.

[0036] The further through hole is a strip-shaped hole arranged radially along the screw. During use, the position of the two pull bolts 76 can be adjusted according to the size of the bottom valve 8 to match the position of the bottom threaded hole 81 of the bottom valve 8.

[0037] This embodiment provides a combined device for removing the bottom valve of a hydraulic column cylinder, integrating pressure relief, screwing, and pulling functions into a single device. This allows for a continuous "one-release, two-twist, three-pull" operation, eliminating the need to change tools midway and directly addressing the core pain point of "complex operation." The removal process of the bottom valve 8 is simplified from the traditional multi-step to a standardized three-step process, significantly improving maintenance efficiency. Furthermore, the device integrates various functional components based on a rod-type main handle 1, making it compact and lightweight, thus solving the problem of inconvenience in carrying traditional multi-tools. Through adjustable designs such as the support rod 31 adjustment, pin 52 adaptation, and U-shaped support seat sliding, it can be compatible with various models of hydraulic columns, eliminating the need to customize tools for different cylinder diameters, greatly reducing maintenance costs, and further meeting the actual needs of on-site maintenance. Example

[0038] The pressure relief mechanism also includes a movable handle 6, which includes a handle rod 61 and a locking pin 62. The handle rod 61 is hinged to the tail end of the main handle 1 and is secured to the main handle 1 by the locking pin 62. Figure 3As shown, the tail end of the main handle 1 is provided with a mounting groove 12, and the bottom end of the handle rod 61 is connected to a handle seat 64. The handle seat 64 is provided with a pin hole 642 that matches the pin 63. The handle seat 64 is hinged in the mounting groove 12 by the pin 63. The front side of the pin 63 and the upper side of the handle seat 64 are provided with a pin hole 641. The main handle 1 is provided with a socket 13 that matches the two pin holes 641. When the pin hole 641 and the socket 13 overlap, the handle rod 61 and the main handle 1 can be fixed together by the locking pin 62. Specifically: When the pin hole 641 on the upper side of the hinge of pin 63 overlaps with the insertion hole 13, the handle 61 is positioned upwards and perpendicular to the main handle 1; when the pin hole 641 on the front side of the hinge of pin 63 overlaps with the insertion hole 13, the handle 61 is positioned backwards and parallel to the main handle 1; during pressure relief, the handle 61 is positioned backwards and perpendicular to the main handle 1 by the locking pin 62. Pressure is applied by gripping the handle 61, and by extending the effective length of the main handle 1, pressure is adjusted according to the pressure relief resistance. The system allows for flexible switching between "standard length" and "extended length" without the need for additional tools. Compared to existing technologies that use "fixed length + temporary force," the system offers significantly improved adaptability and convenience. When tightening the bottom valve plug, the handle rod 61 is positioned upwards and is perpendicular to the main handle 1 via the locking pin 62. While tightening, one hand holds the movable handle 6, and the other hand holds the mounting support handle 3 of the pressure relief mechanism. By pushing and pulling with both hands, the chuck 51 can be driven to rotate, which is more labor-saving than pushing and pulling alone.

[0039] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of the present invention and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of the present invention should be included within the protection scope of the present invention.

Claims

1. A combined device for removing the bottom valve of a hydraulic column cylinder, characterized in that, The system includes a main handle, a pressure relief mechanism, a screwing mechanism, and a pulling mechanism. The pressure relief mechanism includes a pressure plate and a clamping assembly. The pressure plate is fixedly installed at the front end of the main handle. The end of the main handle on the same side as the pressure plate is movably clamped to the bottom of the middle cylinder via the clamping assembly, and the end of the main handle can drive the pressure plate to push the bottom valve core with the clamping part as a fulcrum. The screwing mechanism includes a chuck, pins, and a center column. The center column and the chuck are respectively installed on the upper and lower end faces of the middle part of the main handle. Two pins are symmetrically provided at the bottom of the chuck, and the two pins can be inserted into the corresponding inner part of the bottom valve plug. The drawing mechanism includes a rotary plate, a U-shaped support, a stud, a drawing plate, and a bottom valve connector. The stud is vertically mounted on the top of the central column, and the top of the stud is equipped with an anti-detachment cap. The U-shaped support is vertically slidably fitted onto the stud, with the U-shaped support facing upwards, and can support the bottom of the middle cylinder on both sides of the bottom valve. The drawing plate is vertically slidably mounted on the stud inside the U-shaped support and is detachably connected to the bottom of the bottom valve through the bottom valve connector. The rotary plate is fitted onto the main bolt below the U-shaped support and is threadedly connected to the main bolt.

2. The combined device for removing the cylinder bottom valve in a hydraulic column according to claim 1, characterized in that, The rotary plate includes a rotary plate body, a through hole in the middle of the rotary plate body, and a pull nut is fixedly installed thereon. The pull nut is threaded onto the stud.

3. The combined device for removing the cylinder bottom valve in a hydraulic column according to claim 1, characterized in that, The two ends of the pull plate extend outward to form U-shaped support seats and are symmetrically provided with through holes. The bottom valve connector includes pull bolts symmetrically inserted into the through holes at both ends of the pull plate. The pull bolts are arranged facing upward and are used to connect the pull plate and the bottom valve by threaded engagement with the threaded hole at the bottom of the bottom valve.

4. The combined device for removing the cylinder bottom valve in a hydraulic column according to claim 3, characterized in that, One end of the U-shaped support extending from either end of the drawing plate is fan-shaped. The fan-shaped plate segment has multiple through holes along the circumferential direction with the screw as the axis, for installing the drawing bolt.

5. The combined device for removing the cylinder bottom valve in a hydraulic column according to claim 3, characterized in that, The through hole is a strip-shaped hole arranged radially along the screw.

6. The combined device for removing the cylinder bottom valve in a hydraulic column according to claim 1, characterized in that, The mounting assembly includes a mounting support handle and a fulcrum bolt. The fulcrum bolt is threaded into the lifting hole at the bottom of the middle cylinder. The mounting support handle includes a support rod, a U-shaped clamp, and a locking fastener. The support rod is slidably mounted vertically on the main handle on the same side of the pressure plate and is locked to the main handle by the locking fastener. The U-shaped clamp is mounted on the top of the support rod and can be clamped onto the threaded rod of the fulcrum bolt, abutting against the nut of the fulcrum bolt.

7. The combined device for removing the cylinder bottom valve in a hydraulic column according to claim 1, characterized in that, The central column includes a vertical column, an outer sleeve and the vertical column are vertically installed in the middle of the main handle, a pulling mechanism is installed on the top of the vertical column, and the outer sleeve is rotatably installed on the vertical column below the pulling mechanism.

8. The combined device for removing the cylinder bottom valve in a hydraulic column according to claim 1, characterized in that, The pressure relief mechanism also includes a movable handle, which includes a handle rod and a locking pin. The handle rod is hinged to the end of the main handle and is secured to the main handle by the locking pin.

9. The combined device for removing the cylinder bottom valve in a hydraulic column according to claim 1, characterized in that, The stud and the anti-detachment cap are an integral structure.

10. The combined device for removing the bottom valve of a hydraulic column cylinder according to claim 9, characterized in that, The bottom end of the stud is detachably connected to the top end of the central post.

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