Temporary limiting device for crane track and mounting equipment of temporary limiting device

Abstract

The invention discloses a crane track temporary limiting device and mounting equipment thereof, and relates to the technical field of crane limiting devices.The crane track temporary limiting device comprises a crane track body, a crane moving seat and a base, and two concave positioning frames are fixedly mounted at the bottom of the base; the device has the beneficial effects that when the base is arranged, the concave positioning frame can be quickly positioned on the crane rail body, the screw rod is rotated to enable one end of the screw rod to move towards the inner side of the concave positioning frame and then is matched with the crane rail body to achieve the limiting effect, and the base is arranged on one side of the crane moving seat and then blocks and limits the crane moving seat; when the crane moving seat displaces, the crane moving seat and the abutting plate are removed, the sliding column is pushed to displace, so that the sliding column pushes the first sliding block to slide on the outer side of the first sliding rod, the first buffering plate rotates with the mounting shaft as the axis, and when the mounting shaft rotates, the supporting arms make contact with the ground on the two sides of the crane rail body; and the movable seat of the crane is supported and limited, and the movable seat is convenient and fast to mount and use.

Description

Technical Field

[0001] This invention relates to the field of crane limiting device technology, specifically to a temporary limiting device for crane rails and its installation equipment. Background Technology

[0002] Ships are vehicles capable of navigating or anchoring in waterways for transportation or operations, and their technical performance, equipment, and structural types vary according to different usage requirements. Ship structure refers to the collective term for the hull structure composed of plates and a frame, mainly including the bottom structure, side structure, deck structure, bulkhead structure, bow and stern structure, and superstructure. The ship structure should possess sufficient strength, rigidity, stability, and reliability under external forces, maintain reliable watertightness, and meet operational requirements. Due to the large size of ships, the materials and structural weight used in shipbuilding are relatively heavy, necessitating the use of cranes for structural handling and assembly.

[0003] Currently, there are a large number of crane operations in existing shipbuilding yards and other similar sites. These sites often involve a lot of overlapping operations and temporary site occupation. For safety reasons, it is necessary to restrict the crane's travel range. Therefore, it is necessary to temporarily set up a limit device to stop the crane based on its operating position on the construction site. To this end, we propose a temporary limit device for crane rails and its installation equipment. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a temporary limit device for crane rails and its installation equipment, solving the problems mentioned in the background section.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a temporary limiting device for a crane rail, comprising a crane rail body, a crane moving seat, and a base. Two concave positioning frames are fixedly installed at the bottom of the base. Screws are threaded onto the interior of both sides of each concave positioning frame. Both the concave positioning frames and the screws cooperate with the crane rail body. A vertical support plate is fixedly installed at the top of the base. A sliding column is slidably installed inside the vertical support plate. A stop plate is fixedly installed at one end of each sliding column. A first spring is installed on the outer side of each sliding column. Two first shaft brackets are fixedly installed at the top of the base. An installation shaft is rotatably installed on the inner side of each of the two first shaft brackets. A first buffer plate is fixedly installed at the top of each installation shaft. Two first mounting plates are fixedly installed on one side of each first buffer plate. Two first sliding rods are fixedly installed on the inner side of each of the two first mounting plates. A first slider is slidably installed on the outer side of each first sliding rod. One end of each sliding column is rotatably connected to the first slider. Support arms are fixedly installed on one side of each end of the installation shaft.

[0006] Furthermore, two second mounting plates are fixedly installed on the top of the base, and two second sliding rods are fixedly installed on the inner sides of the two second mounting plates. A second slider is slidably installed on the outer side of the second sliding rod, and a second spring is installed on the outer side of the second sliding rod. The second slider cooperates with the second spring. A second buffer plate is rotatably installed on one side of the first buffer plate, and one end of the second buffer plate is rotatably connected to the top of the second slider.

[0007] Furthermore, two first guide rods are fixedly installed on one side of the abutment plate, and the first guide rods are slidably connected to the vertical support plate.

[0008] Furthermore, side wing plates are fixedly installed on both sides of the concave positioning frame.

[0009] Furthermore, a mounting rod is fixedly installed on the top of the side wing plate, and a top plate is fixedly installed on the top of the mounting rod.

[0010] Furthermore, two triangular support plates are fixedly installed on the top of the base and on one side of the vertical support plate.

[0011] Furthermore, a side wall is provided on one side of the crane's movable seat, and a buffer column is provided on one side of the side wall, the buffer column cooperating with the abutment plate.

[0012] An installation device for a temporary limit device on a crane track is provided, for installing the aforementioned temporary limit device on a crane track. The device includes a base plate, a mounting frame fixedly mounted on the top of the base plate, an mounting groove inside the mounting frame, a threaded rod rotatably mounted inside the mounting groove, a sleeve block threadedly mounted on the outer side of the threaded rod, two support arms fixedly mounted on one side of the sleeve block, a worm gear fixedly mounted on the outer side of the top of the threaded rod extending to the top of the mounting frame, and second shaft brackets fixedly mounted on both sides of the top of the mounting frame. A drive shaft is rotatably mounted inside the second shaft brackets, a worm gear fixedly mounted in the middle of the drive shaft, the worm gear meshing with the worm wheel, and a handle turntable fixedly mounted on one end of the drive shaft.

[0013] Furthermore, several casters are fixedly installed on the bottom of the base plate, and a push-pull handle is fixedly installed on one side of the top of the base plate.

[0014] Furthermore, two second guide rods are fixedly installed inside the mounting groove, the sleeve block is slidably connected to the second guide rods, and a limit block is fixedly installed on the top of one side of the support arm.

[0015] This invention provides a temporary limiting device for crane rails and its installation equipment, which has the following beneficial effects: 1. This temporary limit device for crane rails, through the arrangement of a concave positioning frame, screw, vertical support plate, sliding column, abutment plate, first shaft frame, mounting shaft, first buffer plate, first mounting plate, first sliding rod, first slider, and support arm, allows for temporary stopping and limit of the crane when it needs to be temporarily stopped. This is achieved by simply placing the base on one side of the crane's moving seat on the crane rail body. The base is quickly positioned on the crane rail body via the concave positioning frame. Rotating the screw causes one end to move inwards towards the concave positioning frame, engaging with the crane rail body to achieve the limiting effect. After the base is placed on one side of the crane's moving seat, it blocks and limits the crane's moving seat. When the crane's moving seat shifts, it releases from the abutment plate, pushing the sliding column to move. This, in turn, pushes the first slider to slide outside the first sliding rod, causing the first buffer plate to rotate around the mounting shaft. As the mounting shaft rotates, the support arm contacts the ground on both sides of the crane rail body, providing support and limiting for the crane's moving seat. The device is easy and quick to install and use, and the limiting effect is stable.

[0016] 2. The temporary limit device for the crane track, through the arrangement of a first spring, a second mounting plate, a second sliding rod, a second slider, a second spring, and a second buffer plate, when the abutment plate is pushed by force to displace the sliding column, the abutment plate compresses the first spring, which can then unload the force generated by the displacement of the abutment plate, thus playing a buffering role. At the same time, when the first buffer plate is pushed to displace, the second buffer plate pushes the second slider to slide outside the second sliding rod, and the second spring can then buffer the force generated by its displacement, thus playing a role in buffering and reducing the impact force generated by the displacement of the crane moving seat.

[0017] 3. The installation equipment for the temporary limit device of the crane rail, through the setting of the mounting frame, threaded rod, sleeve block, support arm, worm gear, drive shaft and worm, when the limit device needs to be installed, simply insert the support arm under the top plate and rotate the drive shaft and worm by holding the turntable. This will cause the worm to mesh with the worm gear and drive the threaded rod to rotate, which will drive the sleeve block and support arm to rise. The support arm can then lift the top plate and remove the limit device from the crane rail body, making it easy to install and remove the limit device from the crane rail body. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a side view of the present invention; Figure 3 This is a top view of the present invention; Figure 4 This is a schematic diagram of the limiting device of the present invention cooperating with the crane moving seat; Figure 5This is a partial structural diagram of the present invention; Figure 6 This is a partial structural side view of the present invention; Figure 7 This is a side view of the limiting device of the present invention; Figure 8 This is a bottom view of the limiting device of the present invention; Figure 9 This is a schematic diagram of the installation equipment structure for the limiting device of the present invention; Figure 10 For the present invention Figure 9 Enlarged view of point A in the image.

[0019] In the diagram: 1. Crane rail body; 2. Crane moving seat; 3. Base; 4. Concave positioning frame; 5. Screw; 6. Vertical support plate; 7. Sliding column; 8. Support plate; 9. First spring; 10. First shaft frame; 11. Mounting shaft; 12. First buffer plate; 13. First mounting plate; 14. First sliding rod; 15. First slider; 16. Support arm; 17. Second mounting plate; 18. Second sliding rod; 19. Second slider; 20. Second spring; 1. Second buffer plate; 22. First guide rod; 23. Side wing plate; 24. Mounting rod; 25. Top plate; 26. Bottom plate; 27. Mounting frame; 28. Mounting groove; 29. ​​Threaded rod; 30. Sleeve block; 31. Support arm; 32. Worm gear; 33. Second shaft bracket; 34. Drive shaft; 35. Worm gear; 36. Handle turntable; 37. Moving wheel; 38. Push-pull handle; 39. Second guide rod; 40. Limiting block; 41. Side wall; 42. Buffer connecting post. Detailed Implementation

[0020] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses consistent with some aspects of this disclosure as detailed in the appended claims.

[0021] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the claims.

[0022] Example 1 Please see Figures 4 to 8This invention provides a technical solution: a temporary limiting device for a crane rail, comprising a crane rail body 1, a crane moving seat 2, and a base 3. Two concave positioning frames 4 are fixedly installed at the bottom of the base 3. Screws 5 are threaded onto the interior of both sides of each concave positioning frame 4. Both the concave positioning frames 4 and the screws 5 cooperate with the crane rail body 1. A vertical support plate 6 is fixedly installed at the top of the base 3. A sliding column 7 is slidably installed inside the vertical support plate 6. A stop plate 8 is fixedly installed at one end of the sliding column 7. A first spring 9 is installed on the outer side of the sliding column 7. The top of the base 3 is fixedly... The system is equipped with two first shaft brackets 10. A mounting shaft 11 is rotatably mounted on the inner side of each first shaft bracket 10. A first buffer plate 12 is fixedly mounted on the top of each mounting shaft 11. Two first mounting plates 13 are fixedly mounted on one side of each first buffer plate 12. Two first sliding rods 14 are fixedly mounted on the inner side of each first mounting plate 13. A first slider 15 is slidably mounted on the outer side of each first sliding rod 14. One end of a sliding column 7 is rotatably connected to the first slider 15. Support arms 16 are fixedly mounted on one side of each end of the mounting shaft 11. The concave positioning frame 4 facilitates the mounting of the base 3 onto the crane rail. On the main body 1, the bottom of the concave positioning frame 4 is provided with a notch that mates with the crane rail body 1. Since the side cross-section of the crane rail body 1 is "T" shaped, by setting the screw 5, after the concave positioning frame 4 is set on the outside of the crane rail body 1, by rotating the screw 5, one end of the screw 5 can be moved into the concave positioning frame 4, so that one end of the screw 5 extends to the lower sides of the "T" shape of the crane rail body 1, thus playing the role of limiting the concave positioning frame 4. By setting the base 3 on one side of the crane moving seat 2 on the crane rail body 1, when the crane rail body 1 is in motion, the crane rail body 1 can be positioned to accommodate the crane rail body 1. When the crane moving seat 2 is displaced, the buffer pin 42 on one side contacts the abutment plate 8, which then pushes the abutment plate 8 to make the sliding pin 7 slide within the vertical support plate 6. The sliding pin 7 can then push the first slider 15 to slide outside the first sliding rod 14 and push the first buffer plate 12 to rotate around the mounting shaft 11. At the same time, the support arms 16 at both ends of the mounting shaft 11 apply downward pressure and contact the ground on both sides of the crane rail body 1, which can fix and support the base 3, thereby ensuring that the base 3 will not be pushed and displaced due to force, and ensuring that it limits the movement of the crane moving seat 2.

[0023] In this embodiment, two second mounting plates 17 are fixedly installed on the top of the base 3. Two second sliding rods 18 are fixedly installed on the inner side of the two second mounting plates 17. A second slider 19 is slidably installed on the outer side of the second sliding rod 18. A second spring 20 is installed on the outer side of the second sliding rod 18. The second slider 19 cooperates with the second spring 20. A second buffer plate 21 is rotatably installed on one side of the first buffer plate 12. One end of the second buffer plate 21 is rotatably connected to the top of the second slider 19. Due to the setting of the first spring 9, when the abutment plate 8 contacts the crane moving seat 2 and is pushed to displacement, it will squeeze the first spring 9. The first spring 9 provides support to the abutment plate 8 through its own elastic force, and also buffers the impact force generated by the abutment plate 8. This effectively buffers the movement of the crane moving seat 2 when it is limited. At the same time, when the first buffer plate 12 is pushed and rotates, the second buffer plate 21 on one side pushes the second slider 19 to slide outside the second slide rod 18. The second spring 20 provides support to the second slider 19 through its own elastic force, and also buffers the impact force generated by the displacement of the first buffer plate 12 through the second spring 20. This further improves the buffering effect when the crane moving seat 2 is limited.

[0024] In this embodiment, two first guide rods 22 are fixedly installed on one side of the abutment plate 8, and the first guide rods 22 are slidably connected to the vertical support plate 6. By setting the first guide rods 22, when the abutment plate 8 is pushed and displaced by the crane moving seat 2, the vertical support plate 6 plays a guiding role when the first guide rods 22 are slidably connected to the vertical support plate 6.

[0025] In this embodiment, side wing plates 23 are further fixedly installed on both sides of the concave positioning frame 4. The setting of the side wing plates 23 improves the stability of the concave positioning frame 4 after it is placed on the outside of the crane rail body 1. The side wing plates 23 can contact the ground on both sides of the crane rail body 1, thereby increasing the support area on both sides of the concave positioning frame 4 and thus improving its stability after installation.

[0026] In this embodiment, a mounting rod 24 is fixedly installed on the top of the side wing plate 23, and a top plate 25 is fixedly installed on the top of the mounting rod 24. The top plate 25 can protect the top structure of the base 3 from rain, and also facilitates installation and disassembly with the installation equipment.

[0027] In this embodiment, two triangular support plates are further fixedly installed on the top of the base 3 and on one side of the vertical support plate 6. By setting the two triangular support plates, the vertical support plate 6 can be supported from one side, thereby improving the support of one side of the vertical support plate 6.

[0028] In this embodiment, a side wall 41 is provided on one side of the crane moving seat 2, and a buffer column 42 is provided on one side of the side wall 41. The buffer column 42 cooperates with the abutment plate 8. The buffer column 42 facilitates flexible contact when it contacts the abutment plate 8, avoiding the situation where the limiting device is damaged due to excessive force when it contacts the abutment plate 8.

[0029] Example 2 Please see Figures 1 to 3 , Figure 9 and Figure 10 This invention provides a technical solution: an installation device for a temporary limiting device on a crane track, comprising a base plate 26, an installation frame 27 fixedly installed on the top of the base plate 26, an installation groove 28 provided inside the installation frame 27, a threaded rod 29 rotatably installed inside the installation groove 28, a sleeve block 30 threadedly installed on the outer side of the threaded rod 29, two support arms 31 fixedly installed on one side of the sleeve block 30, a worm gear 32 fixedly installed on the outer side of the top of the threaded rod 29 extending to the top of the installation frame 27, and second shaft brackets 33 fixedly installed on both sides of the top of the installation frame 27, with a drive shaft 34 rotatably installed inside the second shaft brackets 33. A worm 35 is fixedly installed in the middle of the drive shaft 34, and the worm 35 meshes with the worm wheel 32. A handle turntable 36 is fixedly installed at one end of the drive shaft 34. The handle turntable 36 facilitates the rotation of the drive shaft 34 and the worm 35. After the worm 35 rotates and meshes with the worm wheel 32, it can drive the threaded rod 29 to rotate. The threaded rod 29 drives the sleeve block 30 to rise through the threads on its outer side. After the support arm 31 passes through the bottom of the top plate 25, the support arm 31 can be raised by rotating the handle turntable 36. The temporary limiting device is lifted from the crane rail body 1 through the top plate 25, and the temporary limiting device can be removed from the crane moving seat 2.

[0030] In this embodiment, several movable wheels 37 are fixedly installed at the bottom of the base plate 26, and a push-pull handle 38 is fixedly installed on one side of the top of the base plate 26. With the movable wheels 37 and the push-pull handle 38, after the temporary limiting device is lifted by the support arm 31, the device can be moved to different positions by the movable wheels 37. During installation, the temporary limiting device can be placed in a designated position to limit the crane moving seat 2, thereby facilitating the installation and disassembly of the temporary limiting device.

[0031] In this embodiment, two second guide rods 39 are fixedly installed inside the mounting groove 28, and the sleeve block 30 is slidably connected to the second guide rods 39. By setting the second guide rods 39, the sleeve block 30 can be limited and guided when the threaded rod 29 rotates, so as to avoid the situation where the sleeve block 30 and the threaded rod 29 rotate at the same time and cannot move up and down through the outer thread of the threaded rod 29.

[0032] In this embodiment, a limiting block 40 is further fixedly installed on the top of one side of the support arm 31; by setting the limiting block 40, when the support arm 31 passes through the bottom of the top plate 25 and contacts the bottom of the top plate 25, the limiting block 40 can limit the top plate 25.

[0033] In summary, when using the temporary limit device for the crane rail and its installation equipment, if it is necessary to install the temporary limit device on the crane rail body 1, the base plate 26 is moved to the side of the temporary limit device by pushing and pulling the handle 38, and then the support arm 31 passes through the bottom of the top plate 25. Rotating the handle turntable 36 drives the drive shaft 34 to rotate. The worm gear 35 on the outside of the drive shaft 34 meshes with the worm wheel 32, thereby driving the threaded rod 29 to rotate. After the threaded rod 29 rotates, it drives the sleeve block 30 on its outside to move upward through the thread, thus allowing the support arm 31 to be supported from the bottom of the top plate 25, thereby lifting the temporary limit device. Then, using the movable wheel 37 and push-pull handle 38, the device is moved onto the crane rail body 1, so that the concave positioning frame 4 is moved above the crane rail body 1. After that, the handle turntable 36 is reversed to move the sleeve block 30 and the support arm 31 downward, so that the temporary limiting device can be lowered, so that the concave positioning frame 4 is placed on the outside of the crane rail body 1. Then, rotating the screw 5 will cause one end of it to extend to the lower sides of the "T" shape of the crane rail body 1, which will limit the concave positioning frame 4. Then, it will limit the crane moving seat 2. When the crane moving seat 2 is displaced, the buffer column 42 on one side and the abutment plate 8 will... Upon contact, the abutment 8 is pushed, causing the sliding column 7 to slide within the vertical support plate 6. This allows the sliding column 7 to push the first slider 15 to slide outside the first sliding rod 14, and push the first buffer plate 12 to rotate around the mounting shaft 11. Simultaneously, the support arms 16 at both ends of the mounting shaft 11 apply downward pressure, contacting the ground on both sides of the crane track body 1. This effectively fixes and supports the base 3, ensuring that the base 3 will not be pushed or displaced due to force, thus limiting the movement of the crane moving seat 2. Furthermore, when the crane moving seat 2 displaces, the abutment 8, upon contacting and being pushed, will engage the first spring 9. When the first buffer plate 12 is pushed and rotates, the second buffer plate 21 on one side pushes the second slider 19 to slide outside the second slide rod 18. The second spring 20 supports the second slider 19 and buffers the impact force generated by the displacement of the first buffer plate 12, thus further improving the buffering effect when limiting the movement of the crane moving seat 2.

[0034] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A temporary limiting device for a crane rail, comprising a crane rail body (1), a crane moving seat (2), and a base (3), characterized in that: Two concave positioning frames (4) are fixedly installed at the bottom of the base (3). Screws (5) are threaded on both sides of the concave positioning frames (4). The concave positioning frames (4) and screws (5) are engaged with the crane rail body (1). A vertical support plate (6) is fixedly installed at the top of the base (3). A sliding column (7) is slidably installed inside the vertical support plate (6). A stop plate (8) is fixedly installed at one end of the sliding column (7). A first spring (9) is installed on the outside of the sliding column (7). Two first shaft brackets (10) are fixedly installed at the top of the base (3). The inner sides of the two first shaft brackets (10) are rotatably mounted with mounting shafts (11), the top of the mounting shafts (11) is fixedly mounted with a first buffer plate (12), two first mounting plates (13) are fixedly mounted on one side of the first buffer plate (12), two first slide rods (14) are fixedly mounted on the inner sides of the two first mounting plates (13), and a first slider (15) is slidably mounted on the outer side of the first slide rods (14). One end of the slide column (7) is rotatably connected to the first slider (15), and a support arm (16) is fixedly mounted on one side of both ends of the mounting shafts (11).

2. The temporary limiting device for a crane rail according to claim 1, characterized in that: Two second mounting plates (17) are fixedly installed on the top of the base (3). Two second slide rods (18) are fixedly installed on the inner side of the two second mounting plates (17). A second slider (19) is slidably installed on the outer side of the second slide rod (18). A second spring (20) is installed on the outer side of the second slide rod (18). The second slider (19) cooperates with the second spring (20). A second buffer plate (21) is rotatably installed on one side of the first buffer plate (12). One end of the second buffer plate (21) is rotatably connected to the top of the second slider (19).

3. A temporary limiting device for a crane rail according to claim 1, characterized in that: Two first guide rods (22) are fixedly installed on one side of the abutment plate (8), and the first guide rods (22) are slidably connected to the vertical support plate (6).

4. A temporary limiting device for a crane rail according to claim 1, characterized in that: Side wing plates (23) are fixedly installed on both sides of the concave positioning frame (4).

5. A temporary limiting device for a crane track according to claim 4, characterized in that: A mounting rod (24) is fixedly installed on the top of the side wing plate (23), and a top plate (25) is fixedly installed on the top of the mounting rod (24).

6. A temporary limiting device for a crane rail according to claim 1, characterized in that: Two triangular support plates are fixedly installed on the top of the base (3) and on one side of the vertical support plate (6).

7. A temporary limiting device for a crane rail according to claim 1, characterized in that: The crane moving seat (2) has a side wall (41) on one side, and a buffer column (42) is provided on one side of the side wall (41), which cooperates with the abutment plate (8).

8. An installation device for a temporary limit device for a crane rail, used for installing a temporary limit device for a crane rail as described in any one of claims 1-7, comprising a base plate (26), characterized in that: A mounting frame (27) is fixedly installed on the top of the base plate (26). A mounting groove (28) is provided inside the mounting frame (27). A threaded rod (29) is rotatably installed inside the mounting groove (28). A sleeve block (30) is threadedly installed on the outer side of the threaded rod (29). Two support arms (31) are fixedly installed on one side of the sleeve block (30). A worm gear (32) is fixedly installed on the outer side of the top of the mounting frame (27) at one end of the threaded rod (29). A second shaft bracket (33) is fixedly installed on both sides of the top of the mounting frame (27). A drive shaft (34) is rotatably installed inside the second shaft bracket (33). A worm (35) is fixedly installed in the middle of the drive shaft (34). The worm (35) meshes with the worm gear (32). A handle turntable (36) is fixedly installed at one end of the drive shaft (34).

9. The installation equipment for a temporary limit device for a crane rail according to claim 8, characterized in that: Several casters (37) are fixedly installed on the bottom of the base plate (26), and a push-pull handle (38) is fixedly installed on one side of the top of the base plate (26).

10. The installation equipment for a temporary limit device for a crane rail according to claim 8, characterized in that: Two second guide rods (39) are fixedly installed inside the mounting groove (28). The sleeve block (30) is slidably connected to the second guide rods (39). A limit block (40) is fixedly installed on the top of one side of the support arm (31).

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