Moving assembly of scaffold

Abstract

The utility model provides a scaffold moving assembly which comprises a first hollow cylinder fixedly connected to the bottom of a scaffold body, a second hollow cylinder in sliding fit with the inner wall of the first hollow cylinder and a support rotationally connected to the bottom of the second hollow cylinder, and the opposite sides of the first hollow cylinder and the second hollow cylinder are connected with a first spring in a buckled mode. A first locking assembly and a second locking assembly are arranged on the inner wall of the second hollow cylinder. The first spring is arranged between the first hollow cylinder and the second hollow cylinder, energy generated by vibration can be rotated through elastic potential energy of the first spring, and therefore the buffering effect is achieved, potential safety hazards caused by large shaking generated when the scaffold body moves are avoided, and the safety of the device is improved; and the first hollow cylinder and the second hollow cylinder can be locked through the limiting blocks after the scaffold body reaches the designated position, and therefore the safety and stability of the scaffold body during operation can be improved.

Description

Technical Field

[0001] The utility model relates to the field of scaffolding, in particular to a mobile component of a scaffolding. Background Art

[0002] Scaffolding is a working platform set up to ensure the smooth progress of each construction process. It comes in various types and is widely used in various engineering fields, such as viaducts, tunnels, factories, power plants, refineries, etc. It is also suitable for projects such as overpasses, span scaffolding, storage shelves, chimneys, water towers, and indoor and outdoor decoration.

[0003] After searching, the Chinese patent publication number CN219638354U discloses a mobile scaffolding, including four first support columns, each of which is rotatably connected to a first telescopic rod, a first fixed sleeve is fixedly installed on the outer surface of each first support column, a first rotating bearing is fixedly installed on the inner wall of each first fixed sleeve, the inner ring of each first rotating bearing is fixedly connected to a first rotating sleeve, the inner wall of each first rotating sleeve is threadedly connected to the outer surface of the first telescopic rod, three second support columns are fixedly installed on the outer surface of each group of first support columns, and a second telescopic rod is rotatably connected to the interior of each second support column.

[0004] The above patent has the following shortcomings: it can facilitate the movement of the scaffolding by installing a movable frame and walking wheels at the bottom of each supporting column, but the application scenarios of scaffolding are diverse. When the moving road surface is uneven, the scaffolding as a whole will shake, which may easily lead to tipping or sliding, increasing the risk of construction accidents, and has certain limitations.

[0005] To this end, the present novel example proposes a mobile component of a scaffold. Utility Model Content

[0006] In view of this, the embodiments of the present invention hope to provide a mobile component of a scaffold to solve or alleviate the technical problems existing in the prior art and at least provide a beneficial option.

[0007] The technical solution of the embodiment of the utility model is achieved as follows: a moving component of a scaffold comprises a hollow cylinder 1 fixedly connected to the bottom of the scaffold body, a hollow cylinder 2 slidingly matched with the inner wall of the hollow cylinder 1 and a bracket rotatably connected to the bottom of the hollow cylinder 2, a spring 1 is buckled on the opposite side of the hollow cylinder 1 and the hollow cylinder 2, a locking component 1 and a locking component 2 are arranged on the inner wall of the hollow cylinder 2, the locking component 1 comprises a slider longitudinally slidably matched with the inner wall of the hollow cylinder 2 and two symmetrically arranged connecting rods and a limit block, the two ends of the connecting rod are rotatably connected to the slider and the limit block respectively, the limit block is transversely slidably matched with the inner wall of the hollow cylinder 2, and the inner wall of the hollow cylinder 1 is provided with a limit groove matched with the limit block.

[0008] In some embodiments, the bottom of the slider is fixedly connected to a slide rod, the bottom of the slide rod is fixedly connected to a slide plate, the slide plate is slidably fitted on the two inner walls of the hollow cylinder, the outer wall of the slide plate is rotatably connected to a transition ring, and the outer wall of the transition ring is fixedly connected to a T-shaped rod.

[0009] In some embodiments, a gear ring 2 is fixedly connected to the outer wall of the second hollow cylinder, a gear ring 3 is fixedly connected to the top of the bracket, and a gear ring 1 which can mesh with gear rings 2 and 3 at the same time is provided at the bottom of the transition ring.

[0010] In some embodiments, the inner wall of the bracket is rotatably connected to a gear and a moving wheel via a rotating shaft, and a gear block that can mesh with the gear is installed at the bottom of the T-bar.

[0011] In some embodiments, a second spring is buckled on the opposite side of the second hollow cylinder and the slide plate.

[0012] In some embodiments, the second locking assembly includes a fixed cylinder fixedly connected to the inner wall of the second hollow cylinder and a sliding cylinder slidably matched with the inner wall of the fixed cylinder.

[0013] In some embodiments, the inner wall of the sliding cylinder is rotatably connected to a rotating cylinder, a plurality of limit plates are fixedly connected to the circumferential outer wall of the rotating cylinder, a plurality of strip grooves for avoiding the limit plates are opened on the inner wall of the fixed cylinder, and a first slope and a second slope are also opened on the inner wall of the fixed cylinder, and the depth of the strip groove is greater than the depth of the second slope.

[0014] In some embodiments, a tip adapted to the limit plate is formed at the bottom of the sliding cylinder, and a plurality of inclined wedge blocks adapted to the limit plate are fixed to the outer wall of the sliding cylinder at the tip.

[0015] In some embodiments, the outer walls of the sliding rod located at the top of the sliding cylinder and the bottom of the rotating cylinder are fixedly connected to limit rings.

[0016] The embodiment of the utility model has the following advantages due to the adoption of the above technical solution:

[0017] The utility model arranges spring one between hollow cylinder one and hollow cylinder two, utilizes the elastic potential energy of spring one to rotate the energy generated by vibration, thereby achieving a buffering effect, avoiding the potential safety hazard caused by large shaking of the scaffold body when moving, and improving the safety of the device; and utilizes the limit block to lock the hollow cylinder one and the hollow cylinder two after the scaffold body reaches the specified position, thereby improving the safety and stability of the scaffold body during operation.

[0018] By providing hollow tube two, a bracket and moving wheels, the moving wheels can drive the scaffold body to move in any direction by utilizing the rotational cooperation between hollow tube two and the bracket, thereby increasing the convenience of using the scaffold body. At the same time, with the cooperation of gear ring one, gear ring two, gear ring three, gear blocks and rotating shaft, the moving wheels can be limited to ensure that the scaffold body will not shift during operation, thereby further ensuring the stability of the scaffold body.

[0019] By setting up a sliding cylinder, a fixed cylinder, and a rotating cylinder, the three can cooperate with each other to lock the sliding rod so that the rebound distance after it is lowered is limited, thereby achieving reliable locking between the components. In addition, with the cooperation of structures such as the sliding rod, T-bar, and slide plate, the locking between the components can be carried out synchronously, which increases the linkage and thus improves the convenience of use.

[0020] The above summary is for the purpose of description only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments and features described above, further aspects, embodiments and features of the utility model will be readily apparent by reference to the accompanying drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is the main structural diagram of the utility model.

[0023] Figure 2 It is an enlarged schematic diagram of the structure at point A of the present utility model.

[0024] Figure 3 It is a schematic diagram of the internal structure of the hollow cylinder 1 and the hollow cylinder 2 of the utility model.

[0025] Figure 4 It is a structural cross-sectional view of a locking assembly of the utility model.

[0026] Figure 5 It is a partial structural sectional view of the utility model.

[0027] Figure 6 The second structure of the locking assembly of the utility model is shown in FIG. Figure 1 .

[0028] Figure 7 The second structure of the locking assembly of the utility model is shown in FIG. Figure 2 .

[0029] Reference numerals:

[0030] 1. Scaffolding body; 2. Hollow tube 1; 3. Hollow tube 2; 4. Bracket; 5. Spring 1; 6. Locking assembly 1; 7. Locking assembly 2; 8. Slider; 9. Connecting rod; 10. Limiting groove; 11. Limiting block; 12. Sliding rod; 13. T-bar; 14. Transition ring; 15. Slide plate; 16. Gear ring 1; 17. Gear ring 2; 18. Gear ring 3; 19. Spring 2; 20. Gear block; 21. Rotating shaft; 22. Gear; 23. Moving wheel; 24. Sliding tube; 25. Fixed tube; 26. Strip groove; 27. Limiting plate; 28. Inclined surface 1; 29. ​​Rotating tube; 30. Inclined surface 2; 31. Limiting ring; 32. Tip; 33. Inclined surface wedge. DETAILED DESCRIPTION

[0031] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0032] In the present utility model, unless otherwise clearly stipulated and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0033] The embodiments of the present utility model are described in detail below with reference to the accompanying drawings. Embodiment 1:

[0034] like Figure 1-4 As shown, a mobile assembly of a scaffold includes a hollow cylinder 2 fixedly connected to the bottom of a scaffold body 1, a hollow cylinder 3 slidingly fitted on the inner wall of the hollow cylinder 2, and a bracket 4 rotatably connected to the bottom of the hollow cylinder 3.

[0035] A spring 15 is buckled on the opposite side of the hollow cylinder 1 2 and the hollow cylinder 2 3, and a locking assembly 1 6 and a locking assembly 2 7 are arranged on the inner wall of the hollow cylinder 2 3. The locking assembly 1 6 includes a slider 8 that longitudinally slides on the inner wall of the hollow cylinder 2 3 and two symmetrically arranged connecting rods 9 and a limit block 11. The two ends of the connecting rod 9 are respectively rotatably connected to the slider 8 and the limit block 11. The limit block 11 slides transversely on the inner wall of the hollow cylinder 2 3. The inner wall of the hollow cylinder 2 is provided with a limit groove 10 that cooperates with the limit block 11.

[0036] When the scaffold body 1 is moving and the road surface is uneven and has bumps, the hollow cylinder 2 3 is forced to slide toward the top of the hollow cylinder 2, causing the spring 5 to undergo elastic deformation, so that the energy generated by the vibration can be converted into elastic potential energy by the spring 5 to achieve a buffering effect. When the scaffold body 1 moves to the specified position, the slider 8 is moved downward, and the connecting rod 9 is used to push the limit block 11 into the limit groove 10. At this time, the hollow cylinder 2 3 is limited by the limit block 11 and can no longer slide up and down.

[0037] The device arranges a spring 15 between the hollow cylinder 1 2 and the hollow cylinder 2 3, and utilizes the elastic potential energy of the spring 15 to rotate the energy generated by the vibration, thereby achieving a buffering effect, avoiding the scaffold body 1 from shaking greatly when moving and causing safety hazards, thereby improving the safety of the device; the limit block 11 can be used to lock the hollow cylinder 1 2 and the hollow cylinder 2 3 after the scaffold body 1 reaches the specified position, thereby improving the safety and stability of the scaffold body 1 during operation.

[0038] like Figure 4 and Figure 5 As shown, the bottom of the slider 8 is fixedly connected to a slide rod 12, the bottom of the slide rod 12 is fixedly connected to a slide plate 15, the slide plate 15 is slidably fitted on the inner wall of the hollow cylinder 23, the outer wall of the slide plate 15 is rotatably connected to a transition ring 14, and the outer wall of the transition ring 14 is fixedly connected to a T-shaped rod 13.

[0039] The outer wall of the hollow cylinder 2 3 is fixedly connected with a gear ring 2 17 , the top of the bracket 4 is fixedly connected with a gear ring 3 18 , and the bottom of the transition ring 14 is provided with a gear ring 16 that can mesh with the gear ring 2 17 and the gear ring 3 18 at the same time.

[0040] The inner wall of the bracket 4 is rotatably connected to a gear 22 and a moving wheel 23 via a rotating shaft 21 , and a tooth block 20 that can mesh with the gear 22 is installed at the bottom of the T-shaped rod 13 .

[0041] The scaffolding body 1 can be moved by using the moving wheel 23, and the scaffolding body 1 as a whole can be moved in any direction by using the rotation cooperation of the hollow tube 2 3 and the bracket 4; when it is necessary to work, press the T-bar 13 downward until the gear ring 16 is meshed with the gear ring 2 17 and the gear ring 3 18, and the tooth block 20 is meshed with the gear 22, so that the bracket 4 and the moving wheel 23 cannot rotate.

[0042] The present device is provided with a hollow tube 23, a bracket 4 and a moving wheel 23, and utilizes the rotational cooperation of the hollow tube 23 and the bracket 4 so that the moving wheel 23 can drive the scaffold body 1 to move in any direction, thereby increasing the convenience of using the scaffold body 1. At the same time, with the cooperation of the gear ring 1 16, the gear ring 2 17, the gear ring 3 18 and the gear block 20 and the rotating shaft 21, the moving wheel 23 can be limited to ensure that the scaffold body 1 will not shift during operation, thereby further ensuring the stability of the scaffold body 1. Embodiment 2:

[0043] A mobile assembly of a scaffold, this embodiment makes the following improvements on the basis of embodiment 1, such as Figure 5-7 As shown:

[0044] The hollow cylinder 2 3 and the opposite side of the slide plate 15 are buckled with a spring 2 19 .

[0045] The locking assembly 2 7 includes a fixed cylinder 25 fixedly connected to the inner wall of the hollow cylinder 2 3 and a sliding cylinder 24 slidably matched with the inner wall of the fixed cylinder 25 .

[0046] The inner wall of the sliding cylinder 24 is rotatably connected to a rotating cylinder 29, and a plurality of limit plates 27 are fixedly connected to the circumferential outer wall of the rotating cylinder 29. A plurality of strip grooves 26 for avoiding the limit plates 27 are provided on the inner wall of the fixed cylinder 25, and a first slope 28 and a second slope 30 are also provided on the inner wall of the fixed cylinder 25, and the depth of the strip groove 26 is greater than the depth of the second slope 30.

[0047] The bottom of the sliding cylinder 24 is provided with a tip 32 adapted to the limiting plate 27 , and the outer wall of the sliding cylinder 24 at the tip 32 is fixed with a plurality of inclined wedge blocks 33 matched with the limiting plate 27 .

[0048] The outer walls of the sliding rod 12 located at the top of the sliding cylinder 24 and the bottom of the rotating cylinder 29 are fixedly connected to the limiting ring 31 .

[0049] In this embodiment: the slide bar 12 is pushed downward, and the spring 2 19 is pushed by the slide bar 12 and the slide plate 15 to undergo elastic deformation, and the sliding cylinder 24 moves downward under the push of the slide bar 12 and the limiting ring 31. Since the rotating cylinder 29 is rotatably connected to the sliding cylinder 24, when the tip 32 and the inclined wedge block 33 push the limiting plate 27 downward, the limiting plate 27 and the rotating cylinder 29 rotate in the direction of the inclined surface 2 30, and the inclined surface 2 30 is used to limit the limiting plate 27. At the same time, under the linkage of the slide bar 12, the limiting block 11 is pushed into the limiting groove 10, thereby limiting the longitudinal sliding of the hollow cylinder 2 3 along the inside of the hollow cylinder 1 2; T-shaped The rod 13 and the transition ring 14 push the gear ring 16 downward and engage with the gear ring 2 17 and the gear ring 3 18, thereby limiting the rotation of the bracket 4; the T-bar 13 can push the tooth block 20 to engage with the gear 22, thereby limiting the rotation of the moving wheel 23 itself. At this time, the overall position of the scaffolding body 1 is fixed and cannot be pushed further; finally, the slide bar 12 is released, and the slide bar 12 is driven to move upward under the elastic action of the spring 2 19, but the slide bar 12 is blocked by the inclined plane 2 30 and the rising distance is limited, so that the hollow cylinder 1 2 and the hollow cylinder 2 3, the hollow cylinder 2 3 and the bracket 4 and the moving wheel 23 are still in a locked state.

[0050] When the limit needs to be released, the slide bar 12 is pressed again so that the limit plate 27 leaves the inclined plane 2 30 and rotates in the direction of the inclined plane 1 28. Then the slide bar 12 is released and pushed upward by the elastic action of the spring 2 19. At this time, under the guidance of the inclined plane 1 28, the limit plate 27 rotates into the strip groove 26. Since the depth of the strip groove 26 is greater than the depth of the inclined plane 2 30, the slide bar 12 will rise, thereby being retracted into the hollow cylinder 2 3 and contacting the longitudinal sliding restriction between the hollow cylinder 1 2 and the hollow cylinder 2 3. The rise of the T-bar 13, the gear ring 1 16 and the gear block 20 releases the rotation restriction on the hollow cylinder 2 3 and the bracket 4 and the self-rotation restriction of the moving wheel 23. At this time, the scaffold body 1 can be moved arbitrarily.

[0051] The device is provided with a sliding cylinder 24, a fixed cylinder 25, and a rotating cylinder 29. With the cooperation of the three, the sliding rod 12 can be locked to limit the rebound distance after it is lowered, thereby achieving reliable locking between the various components. In addition, with the cooperation of structures such as the sliding rod 12, the T-bar 13, and the slide plate 15, the locking between the various components can be carried out synchronously, thereby increasing the linkage and thus improving the convenience of use.

[0052] Working principle: when the scaffold body 1 is in a movable state, the limit plate 27 is located in the strip groove 26; when the scaffold body 1 is in a locked state, the limit plate 27 is located in the second inclined surface 30.

[0053] Therefore, when the scaffold body 1 needs to be pushed, the T-bar 13 is pressed downward, and the transition ring 14 and the slide plate 15 drive the slide bar 12 to move downward, so that the spring 2 19 is elastically deformed under the force, and when the slide bar 12 descends, the sliding cylinder 24, the limit plate 27 and the rotating cylinder 29 are driven to descend synchronously. Due to the shape characteristics of the limit plate 27, the tip 32 and the inclined wedge block 33, the limit plate 27 rotates while descending, so that the limit plate 27 is disengaged from the inclined surface 2 30 and rotates to the inclined surface 1 28. Due to the shape characteristics of the inclined surface 1 28, the loose Open the T-bar 13. Since the depth of the strip groove 26 is greater than the depth of the inclined surface 30, the slide plate 15 and the slide bar 12 are pushed upward under the elastic action of the spring 2 19. At this time, driven by the slide bar 12 and the T-bar 13, the limit block 11 slides into the hollow cylinder 2 3, so that the hollow cylinder 2 3 can slide longitudinally along the inner wall of the hollow cylinder 1 2. The gear ring 1 16 is disengaged from the gear ring 2 17 and the gear ring 3 18, so that the bracket 4 can rotate along the hollow cylinder 2 3. The gear block 20 is disengaged from the rotating shaft 21, so that the moving wheel 23 can rotate, so that the scaffold body 1 can be freely moved.

[0054] When the scaffold body 1 needs to be locked, the T-bar 13 is pressed downward again until the gear ring 16 is meshed with the gear ring 2 17 and the gear ring 3 18, and the tooth block 20 is meshed with the rotating shaft 21. At this time, the rotational movement between the hollow cylinder 2 3 and the bracket 4 is restricted, and the rotation of the moving wheel 23 itself is restricted; at the same time, the transition ring 14 and the slide plate 15 drive the slide bar 12 to move downward, the spring 2 19 is elastically deformed under the force, and the slide bar 12 drives the slide block 8 to move downward. Under the push of the connecting rod 9, the limit block 11 is inserted into the limit groove 10. At this time, the longitudinal sliding between the hollow cylinder 2 3 and the hollow cylinder 1 2 is locked; at the same time, the sliding As the slide bar 12 descends, the tube 24 uses the tip 32 and the inclined wedge block 33 to push the limit plate 27 downward. Due to the shape characteristics of the limit plate 27, the tip 32 and the inclined wedge block 33, the limit plate 27 rotates while moving downward, so that the limit plate 27 disengages from the strip groove 26 and rotates in the direction of the second inclined surface 30. At this time, the T-bar 13 is released, and the slide bar 12 is driven to rise under the elastic action of the second spring 19. However, since the depth of the second inclined surface 30 is less than the depth of the strip groove 26, the rising distance of the slide bar 12 is limited, so that the components are still in a locked state, and the scaffold body 1 cannot be moved at this time.

[0055] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of various changes or substitutions within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A mobile assembly of a scaffold, comprising a hollow cylinder (2) fixedly connected to the bottom of a scaffold body (1), a hollow cylinder (3) slidingly fitted on the inner wall of the hollow cylinder (2), and a bracket (4) rotatably connected to the bottom of the hollow cylinder (3), characterized in that: The hollow cylinder one (2) and the hollow cylinder two (3) are buckled with a spring one (5) on opposite sides thereof. The inner wall of the hollow cylinder two (3) is provided with a locking assembly one (6) and a locking assembly two (7). The locking assembly one (6) comprises a slider (8) longitudinally slidably matched with the inner wall of the hollow cylinder two (3) and two symmetrically arranged connecting rods (9) and a limit block (11). The two ends of the connecting rod (9) are respectively rotatably connected to the slider (8) and the limit block (11). The limit block (11) is transversely slidably matched with the inner wall of the hollow cylinder two (3). The inner wall of the hollow cylinder one (2) is provided with a limit groove (10) which is limitedly matched with the limit block (11).

2. A scaffolding moving assembly according to claim 1, characterized in that: The bottom of the slider (8) is fixedly connected to a slider rod (12), the bottom of the slider rod (12) is fixedly connected to a slide plate (15), the slide plate (15) is slidably matched with the inner wall of the second hollow cylinder (3), the outer wall of the slide plate (15) is rotatably connected to a transition ring (14), and the outer wall of the transition ring (14) is fixedly connected to a T-shaped rod (13).

3. A scaffolding moving assembly according to claim 2, characterized in that: The outer wall of the second hollow cylinder (3) is fixedly connected to a second gear ring (17), the top of the bracket (4) is fixedly connected to a third gear ring (18), and the bottom of the transition ring (14) is provided with a first gear ring (16) that can mesh with the second gear ring (17) and the third gear ring (18) at the same time.

4. A scaffolding moving assembly according to claim 3, characterized in that: The inner wall of the bracket (4) is rotatably connected to a gear (22) and a moving wheel (23) via a rotating shaft (21), and a tooth block (20) that can mesh with the gear (22) is installed at the bottom of the T-shaped rod (13).

5. The mobile assembly of a scaffold according to claim 2, characterized in that: The second hollow cylinder (3) and the opposite side of the slide plate (15) are buckled with a second spring (19).

6. The mobile assembly of a scaffold according to claim 2, characterized in that: The second locking assembly (7) comprises a fixed cylinder (25) fixedly connected to the inner wall of the second hollow cylinder (3) and a sliding cylinder (24) slidably matched with the inner wall of the fixed cylinder (25).

7. A scaffolding moving assembly according to claim 6, characterized in that: The inner wall of the sliding cylinder (24) is rotatably connected to a rotating cylinder (29), a plurality of limit plates (27) are fixedly connected to the circumferential outer wall of the rotating cylinder (29), a plurality of strip grooves (26) for avoiding the limit plates (27) are formed on the inner wall of the fixed cylinder (25), and a first inclined surface (28) and a second inclined surface (30) are also formed on the inner wall of the fixed cylinder (25), and the depth of the strip grooves (26) is greater than the depth of the second inclined surface (30).

8. A scaffolding moving assembly according to claim 7, characterized in that: The bottom of the sliding cylinder (24) is provided with a tip (32) adapted to the limiting plate (27), and the outer wall of the sliding cylinder (24) at the tip (32) is fixed with a plurality of inclined wedge blocks (33) adapted to the limiting plate (27).

9. A scaffolding moving assembly according to claim 8, characterized in that: The outer walls of the sliding rod (12) located at the top of the sliding cylinder (24) and the bottom of the rotating cylinder (29) are both fixedly connected to the limiting ring (31).

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