Flat valve hydraulic dismounting device

Abstract

The utility model relates to petroleum and natural gas drilling equipment technical field especially is a kind of flat valve hydraulic dismounting device, including mounting bracket, at least two symmetrical settings in mounting bracket's clamping groove, horizontally installs in the push-pull module and lifting module of mounting bracket, the both ends of valve seat are clamped in clamping groove, the push-pull module is driven to connect with valve plate, the lifting module is used to drive flat valve to move up and down, to make the both ends of valve seat disengage or insert clamping groove, the push-pull module is used to drive valve plate to move horizontally, to make valve plate close or away from valve seat;The utility model can avoid flat valve jam, facilitate quickly disassembling valve plate, improve the maintenance qualified rate of flat valve.

Description

Technical Field

[0001] This utility model relates to the field of oil and gas drilling equipment technology, and in particular to a hydraulic disassembly and assembly device for a flat plate valve. Background Technology

[0002] The PFF type manual flat valve, widely used in drilling sites, features a rectangular valve cavity design. Its sealing relies on the planar contact between the valve plate and the valve seat, as well as well pressure-assisted sealing. Under high pressure, a wave spring compensates for axial displacement of the valve seat, achieving a sealing effect with the valve plate.

[0003] During drilling, drilling fluid enters the wave spring chamber between the valve seat and the valve plate. Due to the difficulty in cleaning the valve plate, the drilling fluid accumulates and solidifies in the wave spring chamber over a long period, forming rigid scale. In actual use, a hydraulic device is used to pull the valve stem, causing the valve plate to overcome the friction between it and the valve seat. Because the wave spring chamber is filled with rigid scale, the wave spring cannot rebound, causing the wave spring to squeeze the valve seat. This leads to a sharp increase in friction between the valve seat and the valve plate, obstructing the return space of the wave spring and causing the flat plate valve to jam. Utility Model Content

[0004] This utility model addresses the shortcomings of existing technologies by providing a hydraulic disassembly and assembly device for flat panel valves. This device can prevent flat panel valves from jamming, facilitate quick disassembly of the valve plate, and improve the maintenance qualification rate of flat panel valves.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] This utility model provides a hydraulic disassembly and assembly device for a flat valve, used for disassembling and assembling a flat valve. The flat valve to be disassembled and assembled includes a valve seat and a valve plate. A wave spring is installed at the connection between the valve seat and the valve plate. The device includes a mounting bracket, at least two slots symmetrically arranged on the mounting bracket, a push-pull module and a lifting module horizontally mounted on the mounting bracket. Both ends of the valve seat are respectively engaged in the slots. The push-pull module is driven to the valve plate. The lifting module is used to drive the flat valve to move up and down, so that both ends of the valve seat are disengaged from or inserted into the slots. The push-pull module is used to drive the valve plate to move horizontally, so that the valve plate moves closer to or away from the valve seat.

[0007] The lifting module includes at least two lifting rods that are slidably connected to the slots one on the top and one on the bottom, a lifting bracket connected to the lifting rods, and a lifting unit driven by the lifting brackets. The lifting rods are used to support the valve seat, and the lifting unit is used to drive the lifting brackets to move up and down, so that the lifting rods drive the valve seat to move up and down synchronously.

[0008] The mounting bracket is provided with a cleaning space, which corresponds to the middle of the valve seat;

[0009] When it is necessary to flip the valve seat up or down, force is applied to make the valve seat rotate around the center of the slot so that the valve seat passes through the cleaning space.

[0010] The lifting rod has a support at its top end, which is located in a slot. The support is elongated and extends along the driving direction of the push-pull module.

[0011] The mounting bracket is connected to a horizontally arranged support rod, which is perpendicular to the driving direction of the push-pull module. The top of the support rod is lower than the top of the lifting rod, and the support rod is located on the side of the slot away from the push-pull module.

[0012] The lifting module includes a lifting tray that is slidably connected to the mounting frame and a lifting power unit for driving the lifting tray to move up and down. The lifting tray is provided with a groove for supporting the valve seat, and the center of the groove corresponds to the center of the push-pull module.

[0013] When the lifting power unit drives the lifting tray to move upward to the desired position, the bottom of the valve seat is higher than the top of the slot.

[0014] The lifting pallet includes a lifting support column and a pallet body rotatably connected to the lifting support column. The tray is disposed on the pallet body. The lifting support column is slidably connected to the mounting frame. The lifting power unit is driven by the lifting support column.

[0015] The mounting bracket is connected to at least two support brackets, the slot is provided on the support bracket, and a reinforcing part is provided on the bottom side of the support bracket away from the push-pull module. The length of the reinforcing part gradually increases from top to bottom along the driving direction of the push-pull module.

[0016] The push-pull module includes a push-pull bracket mounted on the mounting frame and a push-pull cylinder mounted on the push-pull bracket. The push-pull cylinder is driven and connected to a valve plate. A crossbeam is connected between the push-pull bracket and the support frame. The crossbeam is parallel to the driving direction of the push-pull cylinder.

[0017] The beneficial effects of this utility model are:

[0018] In practical applications, the flat valve to be disassembled is secured to the slot via a valve seat, thus stabilizing the valve seat on the mounting bracket and limiting the relative displacement between the valve seat and the push-pull module. This restricts the pushing and pulling force along the drive direction of the push-pull module, preventing force deviation. The push-pull module moves the valve plate outward, allowing it to be pulled out of the base. The push-pull module provides axial pulling force to overcome the resistance of the wave spring, thereby pulling the valve plate out. This facilitates cleaning and polishing of the chamber used to install the wave spring, valve plate, and sealing rings. After cleaning, the wave spring and corresponding sealing rings are replaced to ensure the sealing performance of the flat valve and provide effective reset space for the wave spring, preventing the flat valve from jamming. Then, the push-pull module pushes the valve plate into the valve seat, facilitating quick valve plate disassembly and improving the maintenance success rate of the flat valve. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the flat plate valve to be disassembled and assembled.

[0020] Figure 2 This is a schematic diagram of the hydraulic disassembly and assembly device for the flat plate valve.

[0021] Figure 3 This is a sectional view of the installation structure of the flat plate valve and the slot to be disassembled.

[0022] Figure 4 This is a schematic diagram of the installation structure of the flat valve to be disassembled after removing the rotating handle, along with the push-pull module and the slot.

[0023] Figure 5 This is a three-dimensional structural diagram of the hydraulic disassembly and assembly device for the flat plate valve.

[0024] Figure 6 This is a top view of the structure of the hydraulic disassembly and assembly device for the flat plate valve in another embodiment.

[0025] Figure 7 This is a schematic diagram of the installation structure of the lifting module and the mounting frame in another embodiment.

[0026] Figure 8 This is a three-dimensional structural diagram of the hydraulic disassembly and assembly device for the flat valve in another embodiment.

[0027] 01. Flat plate valve; 011. Valve seat; 012. Valve plate; 013. Wave spring;

[0028] 1. Mounting bracket; 100. Card slot; 200. Space clearing;

[0029] 2. Push-pull module; 21. Push-pull bracket; 22. Push-pull hydraulic cylinder;

[0030] 300. Crossbeam;

[0031] 3. Lifting module;

[0032] 31. Lifting mast; 311. Support unit; 32. Lifting bracket; 33. Lifting unit;

[0033] 4. Support rod;

[0034] 51. Lifting pallet; 511. Lifting support column; 512. Pallet body; 52. Lifting power unit;

[0035] 6. Support frame; 61. Reinforcing part. Detailed Implementation

[0036] To facilitate understanding by those skilled in the art, the present invention will be further described below in conjunction with embodiments and accompanying drawings. Specific embodiments of the present invention will be described below. It should be noted that, in order to provide a concise description of these embodiments, this specification cannot provide a detailed description of all features of the actual embodiments. Example

[0037] refer to Figures 1 to 5 As shown, this utility model provides a hydraulic disassembly and assembly device for a flat valve, used for disassembling and assembling a flat valve 01. The flat valve 01 to be disassembled and assembled includes a valve seat 011 and a valve plate 012. A wave spring 013 is installed at the connection between the valve seat 011 and the valve plate 012. The device includes a mounting frame 1, at least two slots 100 symmetrically arranged on the mounting frame 1, a push-pull module 2 and a lifting module 3 horizontally installed on the mounting frame 1. The two ends of the valve seat 011 are respectively engaged in the slots 100. The push-pull module 2 is drivenly connected to the valve plate 012. The lifting module 3 is used to drive the flat valve 01 to move up and down, so that the two ends of the valve seat 011 disengage from or insert into the slots 100. The push-pull module 2 is used to drive the valve plate 012 to move horizontally, so that the valve plate 012 moves closer to or away from the valve seat 011.

[0038] refer to Figures 1 to 3 As shown, in practical applications, an O-ring seal is installed at the connection between the valve plate 012 and the wave spring 013 to ensure the sealing performance of the flat valve 01; the hydraulic cylinder used in the push-pull module 2 clamps the flat valve 01 to be disassembled into the slot 100 via the valve seat 011, thereby stabilizing the valve seat 011 on the mounting bracket 1, limiting the relative displacement between the valve seat 011 and the push-pull module 2, and limiting the push-pull force along the driving direction of the push-pull module 2 to avoid force deviation; Reference Figures 3 to 4As shown, since no rotational torque is required for the valve plate 012 and other structures during the pulling process, before the valve plate 012 is driven and connected to the push-pull module 2, the rotating handle and other structures connected to the valve plate 012 on the flat valve 01 are removed. Then, the push-pull module 2 is driven and connected to the valve plate 012. The axial pushing and pulling force of the push-pull module 2 can be directly applied to the valve plate 012, which facilitates the stable transmission of the pushing and pulling force. After the valve plate 012 is pulled out of the valve seat 011, the wave spring 013 can be cleaned, which facilitates the treatment of rigid scale buildup in the chamber. (Reference) Figure 2 , 4 As shown, when the valve plate 012 needs to be removed, the push-pull module 2 moves the valve plate 012 outward, causing it to be pulled out of the base. The push-pull module 2 provides axial pulling force to overcome the resistance of the wave spring 013, thereby pulling the valve plate 012 out. This facilitates cleaning and polishing of the chamber used to install components such as the wave spring 013, valve plate 012, and sealing rings. (Refer to...) Figure 2 As shown, after the chamber is cleaned, the wave spring 013 and the corresponding sealing ring are replaced to ensure the sealing performance of the flat valve 01, provide effective reset space for the wave spring 013, and prevent the flat valve 01 from getting stuck. Then, the push-pull module 2 pushes the valve plate 012 into the valve seat 011, which facilitates quick disassembly of the valve plate 012 and improves the maintenance qualification rate of the flat valve 01.

[0039] refer to Figure 5 As shown, in this embodiment, the lifting module 3 includes at least two lifting rods 31 that are slidably connected to the slot 100 one on the top and one on the bottom, a lifting bracket 32 ​​connected to the lifting rods 31, and a lifting unit 33 drivenly connected to the lifting bracket 32. The lifting rods 31 are used to support the valve seat 011. In actual application, the lifting unit 33 is a hydraulic cylinder. The lifting unit 33 is used to drive the lifting bracket 32 ​​to move up and down, so that the lifting rods 31 drive the valve seat 011 to move up and down synchronously. The independently set lifting rods 31 directly support both ends of the valve seat 011, ensuring that the valve seat 011 is raised horizontally and avoiding the valve seat 011 from tilting and getting stuck. It is convenient to use flat valves 01 of different sizes. By adjusting the position of the lifting rods 31 to match the length of the valve seat 011, the versatility is improved.

[0040] refer to Figure 2 , 5As shown, in this embodiment, the mounting bracket 1 is provided with a cleaning space 200, which corresponds to the middle of the valve seat 011. In actual application, when the valve plate 012 is pulled out of the valve seat 011, force is applied to drive the valve seat 011 to rotate downward around the center of the slot 100, so that the valve seat 011 passes through the cleaning space 200. The cleaning space 200 provides the rotation space for the valve seat 011, thereby smoothly turning the opening of the chamber corresponding to the valve plate 012 downward, which is convenient for pouring the drilling fluid inside the valve seat 011. Force is applied to turn the chamber of the valve plate 012 upward, and the inside of the chamber is cleaned by high-pressure flushing or mechanical tools. After the inside of the chamber is cleaned, the wave spring 013 and other components to be replaced are installed. The valve seat 011 is rotated again so that the opening end of the chamber corresponds to the valve plate 012. The push-pull module 2 pushes the valve plate 012 into the valve seat 011, realizing the smooth installation of the valve plate 012, thereby completing the maintenance, cleaning and component replacement work of the flat valve 01.

[0041] refer to Figure 5 As shown, in this embodiment, the top end of the lifting rod 31 is provided with a support part 311. The support part 311 is located in the slot 100. The support part 311 is elongated and extends along the driving direction of the push-pull module 2. The support part 311 increases the support surface, which facilitates the distribution of the load on the valve seat 011 and prevents local stress concentration from causing deformation of the lifting rod 31. Since the direction of the support part 311 is consistent with the push-pull direction of the valve plate 012, it ensures that the valve seat 011 does not deviate when moving horizontally, and avoids misalignment and jamming between the valve plate 012 and the valve seat 011.

[0042] refer to Figure 3 , 4As shown in Figure 5, in this embodiment, the mounting bracket 1 is connected to a horizontally arranged support rod 4. The support rod 4 is perpendicular to the driving direction of the push-pull module 2. The top of the support rod 4 is lower than the top of the lifting rod 31. The support rod 4 is located on the side of the slot 100 away from the push-pull module 2. In actual application, the bottom of the valve seat 011 is supported by the support rod 4 and the lifting rod 31. The center of gravity of the flat valve 01 is located between the support rod 4 and the lifting rod 31. After the valve plate 012 is pulled out of the chamber, the lifting unit 33 drives the lifting rod 31 to move downward, so that the opening of the chamber faces upward, which is convenient for the drilling fluid inside the chamber to be discharged. Then, the lifting unit 33 drives the lifting rod 31 to move upward, so that the opening end of the chamber is in an upward tilted state, which is convenient for the drilling fluid inside the chamber to be discharged. After manually cleaning the wave spring 013, the chamber, and the sealing ring, and replacing the sealing ring and wave spring 013 inside the valve seat 011, the lifting unit 33 drives the lifting rod 31 and the valve seat 011 to rotate until the valve plate 012 corresponds to the opening of the chamber. The push-pull module 2 pushes the valve plate 012 in, completing the installation of the valve plate 012. After the valve plate 012 is pulled out, because the wave spring 013 stores elastic potential energy, the support rod 4 is used to hold the rear end of the valve seat 011 to prevent the wave spring 013 from rebounding and hitting the valve seat 011. In addition, during the process of the lifting rod 31 raising the valve seat 011, the support rod 4 and the lifting rod 31 support the valve seat 011, and the slot 100 limits the valve seat 011 to the front and rear to prevent the valve seat 011 from falling suddenly.

[0043] refer to Figure 2 , 5 As shown, in this embodiment, the mounting bracket 1 is connected to at least two support brackets 6. The slot 100 is provided on the support bracket 6. A reinforcing part 61 is provided on the side of the bottom of the support bracket 6 away from the push-pull module 2. The length of the reinforcing part 61 gradually increases from top to bottom along the driving direction of the push-pull module 2. The reinforcing part 61 generates a reverse torque, which helps to prevent the support bracket 6 from deforming, widens the bottom of the support bracket 6, lowers the overall center of gravity, and avoids the whole machine shaking when the flat valve 01 is disassembled and assembled.

[0044] refer to Figure 2 , 4 As shown in Figure 5, in this embodiment, the push-pull module 2 includes a push-pull bracket 21 mounted on the mounting frame 1 and a push-pull cylinder 22 mounted on the push-pull bracket 21. The push-pull cylinder 22 is drivenly connected to the valve plate 012. A crossbeam 300 is connected between the push-pull bracket 21 and the support frame 6. The crossbeam 300 is parallel to the driving direction of the push-pull cylinder 22. Through the crossbeam 300, the force between the valve seat 011 and the valve plate 012 is applied to the mounting frame 1 and the push-pull bracket 21, converting the thrust of the push-pull cylinder 22 into internal stress between the push-pull bracket 21 and the mounting frame 1, reducing the torsional deformation of the mounting frame 1, avoiding repeated impacts from the push-pull cylinder 22 that could cause the support frame 6 to crack, and ensuring structural integrity. Example

[0045] The difference between this embodiment and Embodiment 1 is that:

[0046] refer to Figures 6 to 8 As shown, in this embodiment, the lifting module 3 includes a lifting tray 51 slidably connected to the mounting frame 1 and a lifting power unit 52 for driving the lifting tray 51 to move up and down. The lifting tray 51 is provided with a groove for supporting the valve seat 011. The center of the groove corresponds to the center of the push-pull module 2, which stably supports the bottom of the valve seat 011 and prevents the middle of the valve seat 011 from bending and deforming due to its own weight. This is beneficial for the application of large or heavy-duty flat valves 01 and improves structural stability. In actual application, the lifting power unit 52 uses a hydraulic cylinder. After the push-pull module 2 pulls out the valve plate 012, the lifting power unit 52 drives the lifting tray 51 to move upward to the required position. The bottom end of the valve seat 011 is higher than the top end of the slot 100, which facilitates the removal of the valve seat 011. (Reference) Figure 4 , 6 As shown, when both ends of the valve seat 011 are engaged in the slot 100, force is applied to cause the valve seat 011 to rotate around the slot 100, so that the opening end of the chamber is tilted downwards, allowing the drilling fluid in the chamber to be discharged smoothly. This ensures that the drilling fluid can be discharged smoothly without the valve seat 011 coming off. Then, force is applied to cause the valve seat 011 to rotate upwards, so that the opening end of the chamber is facing upwards, allowing the interior of the chamber to be cleaned by high-pressure flushing or mechanical tools. After the interior of the chamber is cleaned, the wave spring 013 and other components to be replaced are installed, thereby providing effective reset space for the wave spring 013 and preventing the flat valve 01 from getting stuck. Then, the push-pull module 2 pushes the valve plate 012 into the valve seat 011, which facilitates quick disassembly of the valve plate 012 and improves the maintenance qualification rate of the flat valve 01.

[0047] refer to Figure 4 , 6 As shown in Figure 7, in this embodiment, the lifting tray 51 includes a lifting support column 511 and a tray body 512 rotatably connected to the lifting support column 511. The tray groove is disposed on the tray body 512. The lifting support column 511 is slidably connected to the mounting frame 1. The lifting power unit 52 is drivenly connected to the lifting support column 511. In actual application, when the valve plate 012 is pulled out by the push-pull module 2, the lifting power unit 52 drives the lifting support column 511 and the tray body 512 to move upward until the bottom end of the valve seat 011 is higher than the top end of the slot 100, and applies force to drive the valve seat 011 and the tray body 512 to rotate. (Refer to...) Figure 8As shown, specifically, when the valve seat 011 rotates, the applied force only needs to be sufficient to drive the valve seat 011 to rotate horizontally, reducing the burden of manual operation. When the tray body 512 is higher than the slot 100, the space occupied by the horizontal rotation of the tray body 512 is independent of the slot 100. The tray body 512 can rotate smoothly in the area between the two slots 100, preventing interference between the tray and the slot 100 when rotating, and ensuring the stable rotation of the valve seat 011. After rotating the valve seat 011 180°, the lifting power unit 52 drives the valve seat 011 to descend, locking both ends of the valve seat 011 into the corresponding slots 100. The slots 100 restrict the displacement of both ends of the valve seat 011, and the force applied flips the valve seat 011, thus tilting it out. The drilling fluid inside the chamber is collected in a corresponding collection tank or aggregator within the dumping area to prevent it from being directly poured onto the ground and difficult to clean. By pointing the chamber opening away from the push-pull module 2, the drilling fluid inside the chamber is prevented from being poured directly into the center of the mounting frame 1, improving environmental cleanliness and facilitating centralized treatment of the drilling fluid. After the drilling fluid is discharged, tilting the chamber opening upwards allows for easy cleaning of the interior. After cleaning, the wave spring 013 and other components to be replaced are installed, providing effective reset space for the wave spring 013 and preventing the flat valve 01 from jamming. Then, the push-pull module 2 pushes the valve plate 012 into the valve seat 011, facilitating quick disassembly of the valve plate 012 and improving the maintenance pass rate of the flat valve 01.

[0048] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some changes or modifications to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes, and modifications made to the above embodiments based on the present utility model without departing from the scope of the present utility model shall fall within the scope of the present utility model.

Claims

1. A hydraulic disassembly and assembly device for a flat valve, used for disassembling and assembling a flat valve (01), wherein the flat valve (01) to be disassembled and assembled includes a valve seat (011) and a valve plate (012), and a wave spring (013) is installed at the connection between the valve seat (011) and the valve plate (012), characterized in that, The device includes a mounting bracket (1), at least two symmetrically arranged slots (100) on the mounting bracket (1), a push-pull module (2) and a lifting module (3) horizontally mounted on the mounting bracket (1). The two ends of the valve seat (011) are respectively engaged in the slots (100). The push-pull module (2) is driven to connect with the valve plate (012). The lifting module (3) is used to drive the flat valve (01) to move up and down so that the two ends of the valve seat (011) are disengaged from or inserted into the slots (100). The push-pull module (2) is used to drive the valve plate (012) to move horizontally so that the valve plate (012) moves closer to or away from the valve seat (011).

2. The hydraulic disassembly and assembly device for a flat valve according to claim 1, characterized in that, The lifting module (3) includes at least two lifting rods (31) that are slidably connected to the slot (100) one by one, a lifting bracket (32) connected to the lifting rods (31), and a lifting unit (33) driven by the lifting bracket (32). The lifting rods (31) are used to support the valve seat (011), and the lifting unit (33) is used to drive the lifting bracket (32) to move up and down, so that the lifting rods (31) drive the valve seat (011) to move up and down synchronously.

3. The hydraulic disassembly and assembly device for a flat valve according to claim 2, characterized in that, The mounting bracket (1) is provided with a cleaning space (200), which corresponds to the middle of the valve seat (011); When it is necessary to flip the valve seat (011) up and down, force is applied to drive the valve seat (011) to rotate around the center of the slot (100) so that the valve seat (011) passes through the cleaning space (200).

4. The hydraulic disassembly and assembly device for a flat valve according to claim 2, characterized in that, The top of the lifting rod (31) is provided with a support part (311), which is located in the slot (100). The support part (311) is long and extends along the driving direction of the push-pull module (2).

5. The hydraulic disassembly and assembly device for a flat valve according to claim 2, characterized in that, The mounting bracket (1) is connected to a horizontally arranged support rod (4). The support rod (4) is perpendicular to the driving direction of the push-pull module (2). The top of the support rod (4) is lower than the top of the lifting rod (31). The support rod (4) is located on the side of the slot (100) away from the push-pull module (2).

6. The hydraulic disassembly and assembly device for a flat valve according to claim 2, characterized in that, The lifting module (3) includes a lifting tray (51) that is slidably connected to the mounting frame (1) and a lifting power unit (52) for driving the lifting tray (51) to move up and down. The lifting tray (51) is provided with a groove for supporting the valve seat (011), and the center of the groove corresponds to the center of the push-pull module (2). When the lifting power unit (52) drives the lifting tray (51) to move upward to the desired position, the bottom of the valve seat (011) is higher than the top of the slot (100).

7. The hydraulic disassembly and assembly device for a flat valve according to claim 6, characterized in that, The lifting pallet (51) includes a lifting support column (511) and a pallet body (512) rotatably connected to the lifting support column (511). The tray is provided on the pallet body (512). The lifting support column (511) is slidably connected to the mounting frame (1) and the lifting power unit (52) is drivenly connected to the lifting support column (511).

8. The hydraulic disassembly and assembly device for a flat valve according to claim 1, characterized in that, The mounting bracket (1) is connected to at least two support brackets (6), the slot (100) is provided on the support bracket (6), and a reinforcing part (61) is provided on the side of the bottom of the support bracket (6) away from the push-pull module (2). The length of the reinforcing part (61) along the driving direction of the push-pull module (2) gradually increases from top to bottom.

9. The hydraulic disassembly and assembly device for a flat valve according to claim 8, characterized in that, The push-pull module (2) includes a push-pull bracket (21) mounted on the mounting frame (1) and a push-pull cylinder (22) mounted on the push-pull bracket (21). The push-pull cylinder (22) is driven to connect with the valve plate (012). A crossbeam (300) is connected between the push-pull bracket (21) and the support frame (6). The crossbeam (300) is parallel to the driving direction of the push-pull cylinder (22).

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