An arch skeleton six-prism block installation precision positioning device

Abstract

The utility model belongs to roadbed arch skeleton six prism piece installation technical field, concretely is a kind of arch skeleton six prism piece installation precision positioning device, including main truss, positioning fixture, adjusting bolt and six prism piece installation clamping groove, the positioning fixture is equipped with two, is fixedly installed in the left and right ends of main truss respectively, the adjusting bolt is set on positioning fixture, the six prism piece installation clamping groove is installed in the bottom of main truss.The utility model the device can be firmly set in arch ring by positioning fixture and adjusting bolt whole mould, six prism piece is paved in six prism piece installation clamping groove again, realizes six prism piece paving linear effect of appearance, height flush, seam width standard.

Description

Technical Field

[0001] This utility model relates to the technical field of hexagonal block installation for roadbed arched framework; specifically, this utility model relates to a precise positioning device for installing hexagonal blocks of an arched framework. Background Technology

[0002] With the rapid development of high-speed railway construction in my country, the requirements for construction quality standards have also gradually increased. The traditional method of laying hexagonal blocks in the subgrade slope skeleton is prone to causing common quality problems such as uneven surface, non-standard joint width, and inaccurate elevation positioning. If the laying is not up to standard during static acceptance, it will cause rework and waste of materials, and rectification will cost a lot of time, manpower and resources. Utility Model Content

[0003] In view of this, the present invention provides a precise positioning device for installing hexagonal blocks of an arched frame, thereby solving or at least alleviating the above-mentioned problems existing in the prior art.

[0004] To achieve the aforementioned objective, this utility model provides a precise positioning device for installing hexagonal blocks of an arched frame, comprising a main truss, positioning clamps, adjusting bolts, and hexagonal block mounting slots. Two positioning clamps are provided and are respectively fixedly installed at the left and right ends of the main truss. The adjusting bolts are set on the positioning clamps, and the hexagonal block mounting slots are installed at the bottom of the main truss.

[0005] Preferably, the opening of the positioning clamp faces downward, and multiple hexagonal block mounting slots are provided, which are distributed sequentially from left to right on the main truss.

[0006] Preferably, it further includes a fixed shaft, a lifting structure, and a lateral adjustment assembly. The fixed shaft is located on the front side of the main truss and is fixedly installed between the two positioning clamps. The lifting structure is provided with multiple hexagonal block mounting slots and is sleeved on the fixed shaft. The lateral adjustment assembly is provided with multiple hexagonal block mounting slots and is laterally slidably installed on the main truss.

[0007] Preferably, the lateral adjustment assembly includes a first slide groove, a sliding plate, a first connecting rod, and a sliding sleeve. The first slide groove is formed on the main truss. Two sliding plates are provided, and the top ends of the two sliding plates are laterally slidably disposed in the first slide groove. The first connecting rod is fixedly disposed between the two sliding plates and is located at the bottom end of the sliding plate. Two sliding sleeves are provided and are symmetrically distributed from left to right. The rear end of the sliding sleeve is sleeved on the first connecting rod, and the front end of the sliding sleeve is sleeved on the fixed shaft. The sliding sleeve is fixedly connected to the hexagonal block mounting slot.

[0008] Preferably, the lateral adjustment assembly further includes an extension plate and a first threaded rod. Two extension plates are provided, and the two extension plates are respectively fixedly disposed at the left and right ends above the first slide groove. The first threaded rod is rotatably installed between the two extension plates. The top end of the sliding plate extends to the space between the two extension plates, and the top end of the sliding plate is threadedly connected to the first threaded rod.

[0009] Preferably, the lifting structure includes a rotating sleeve, an upper fixed rod, a lower fixed rod, a second connecting rod, and a lifting plate. Two rotating sleeves are provided, and the two rotating sleeves are symmetrically distributed on the fixed shaft. A sliding sleeve is located between the two rotating sleeves, and one end of the rotating sleeve contacts the sliding sleeve. The upper fixed rod is fixedly located at the top of the rotating sleeve, and the lower fixed rod is fixedly located at the bottom of the rotating sleeve. The second connecting rod is fixedly located between the two upper fixed rods. The lifting plate is fixedly located at the bottom end of the lower fixed rod, and the front side of the lifting plate can contact the rear side of the hexagonal block mounting slot.

[0010] Preferably, the lifting structure further includes a pressure rod, which is fixedly mounted on the top of the upper fixing rod. The pressure rod is arc-shaped, the top of the upper fixing rod is located behind the top of the pressure rod, and the bottom of the pressure rod can contact the rear inclined surface inside the hexagonal block.

[0011] Preferably, the lifting structure further includes a fixed seat, a push plate, a second slide groove, a second threaded rod, and a limiting rod. The fixed seat is fixedly installed on the front side of the main truss, the push plate is located below the fixed seat, the second slide groove is opened on the push plate, the second connecting rod is slidably sleeved in the second slide groove in the front-back direction, the bottom end of the second threaded rod passes through the fixed seat and is rotatably connected to the push plate, the second threaded rod is threadedly connected to the fixed seat, the limiting rod passes through the fixed seat and is fixedly connected to the push plate, and the limiting rod is located on the front side of the threaded rod.

[0012] Preferably, the lateral adjustment assembly further includes a third slide groove, the front side of the slide sleeve is provided with a third slide groove, and the fixed shaft is slidably disposed in the third slide groove in the front-back direction.

[0013] Compared with the prior art, the present invention has at least the following beneficial effects: 1. This application uses positioning clamps and adjusting bolts to firmly set the mold as a whole inside the arch ring, and then lays the hexagonal blocks in the hexagonal block installation slots to achieve the effect of beautiful hexagonal block paving lines, even height, and standard joint width.

[0014] 2. This application uses a lateral adjustment component to adjust the lateral position of the hexagonal blocks in the first row, making the hexagonal blocks in the first row more regular, improving construction accuracy, and meeting construction design requirements.

[0015] 3. This application uses a lifting structure to create a gap between the first row of hexagonal blocks and the bottom of the arch frame. When the position of the hexagonal blocks needs to be adjusted, the first row of hexagonal blocks can be pulled down to the bottom plane of the arch frame to create a gap between the first row of hexagonal blocks and the second row of hexagonal blocks, which facilitates the adjustment of the position of the first row of hexagonal blocks. Then, the first row of hexagonal blocks is adjusted and calibrated by the lateral adjustment component, and then the second row of hexagonal blocks is pulled down to fit with the first row of hexagonal blocks, thereby better achieving the overall accurate position of the hexagonal blocks and improving the construction quality. Attached Figure Description

[0016] The disclosure of this utility model will become more apparent with reference to the accompanying drawings. It should be understood that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of this utility model. In the drawings: Figure 1 This is a bottom view of Embodiment 1 of the present utility model; Figure 2 This is a front view of Embodiment 1 of the present utility model; Figure 3 This is a schematic diagram of the overall structure of Embodiment 2 of this utility model; Figure 4 This utility model Figure 3 Enlarged view of point A in the middle; Figure 5 This is a schematic diagram of the lateral adjustment component and lifting structure of Embodiment 2 of this utility model.

[0017] Reference numerals: 1-Main truss; 2-Positioning clamp; 3-Adjusting bolt; 4-Hexagonal block mounting slot; 5-Fixed shaft; 6-First slide groove; 7-Sliding plate; 8-First connecting rod; 9-Sliding sleeve; 10-Extension plate; 11-First threaded rod; 12-Rotating sleeve; 13-Upper fixing rod; 14-Lower fixing rod; 15-Second connecting rod; 16-Lifting plate; 17-Pressure rod; 18-Fixed seat; 19-Push plate; 20-Second slide groove; 21-Second threaded rod; 22-Limiting rod; 23-Third slide groove. Detailed Implementation

[0018] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0019] Example 1 like Figures 1 to 2As shown, a precise positioning device for installing hexagonal blocks in an arched frame includes a main truss 1, positioning clamps 2, adjusting bolts 3, and hexagonal block mounting slots 4. Two positioning clamps 2 are provided and are fixedly installed at the left and right ends of the main truss 1, respectively. The adjusting bolts 3 are set on the positioning clamps 2, and the hexagonal block mounting slots 4 are installed at the bottom of the main truss 1.

[0020] Positioning clamp 2 is attached to the arch frame edging, and adjusting bolt 3 is used to fix the main truss 1 to the arch frame. Hexagonal block is precisely positioned and laid using hexagonal block mounting slot 4. Hexagonal block mounting slot 4 is made of steel plate and its shape and size are adapted to the hexagonal block. Placing the hexagonal block into the hexagonal block mounting slot 4 ensures that the overall surface of the hexagonal block is smooth and the height is even after laying.

[0021] The opening of the positioning clamp 2 faces downward, and there are multiple hexagonal block mounting slots 4, which are distributed from left to right on the main truss 1.

[0022] Positioning clamps 2 are welded to the left and right ends of the main truss 1. The openings of the positioning clamps 2 face downwards and are fitted onto the arched frame. One end of the positioning clamp 2 is L-shaped, and the other end is a U-shaped clamp. Adjusting bolts 3 are set on the U-shaped clamps. The width of the U-shaped clamps is greater than the side width of the arched frame. The arched frame and the U-shaped clamps are locked and fixed by adjusting bolts 3, and the main truss 1 can be stably fixed at this height. Hexagonal blocks are placed into the corresponding hexagonal block mounting slots 4 on the main truss 1 in sequence, thereby realizing the laying of the first row of hexagonal blocks. After the laying is completed, the overall surface of the hexagonal blocks is smooth, the joint width is standard, and the line shape is beautiful. The device is removed, and subsequent laying can be carried out on the basis of the first row that has been laid, and the subsequent hexagonal blocks can be laid in sequence.

[0023] Example 2 like Figures 3 to 5 As shown, it also includes a fixed shaft 5, a lifting structure and a lateral adjustment assembly. The fixed shaft 5 is located on the front side of the main truss 1 and is fixedly installed between two positioning clamps 2. The lifting structure is provided with multiple hexagonal block mounting slots 4 and is sleeved on the fixed shaft 5. The lateral adjustment assembly is provided with multiple hexagonal block mounting slots 4 and is laterally slidably installed on the main truss 1.

[0024] In actual construction, the actual width and shape of the arch frame are slightly larger than the designed width and curvature during processing. The positions of the hexagonal block mounting slots 4 on the main truss 1 may also deviate from the designed distance. Therefore, the lifting structure and lateral adjustment components are set up to adjust the distance between the hexagonal block mounting slots 4 during actual construction, better adapt to the on-site construction conditions, further ensure the accuracy of the hexagonal blocks during laying, improve construction quality, avoid rework and material waste, and speed up the construction progress.

[0025] The lifting structure can raise the hexagonal block mounting slot 4 to a position higher than the bottom of the arch frame, creating a gap between the first row of hexagonal blocks and the bottom of the arch frame. After laying the first row of hexagonal blocks, if the position of the hexagonal blocks deviates from the design position when laying the second row or subsequent rows, they can be removed from the bottom of the first row of hexagonal blocks. The first row of hexagonal blocks can be moved downwards to fit against the bottom of the arch frame, creating space between the first and second rows of hexagonal blocks, facilitating the lateral adjustment of the first row of hexagonal blocks. After the position of the first row of hexagonal blocks is adjusted, the second row is pulled down to fit against the first row, and so on, further making the hexagonal blocks inside the arch frame more regular, with accurate elevation and standard joint width, while also being easy to operate and improving construction accuracy.

[0026] In this embodiment, the lateral adjustment assembly includes a first slide groove 6, a sliding plate 7, a first connecting rod 8, and a sliding sleeve 9. The first slide groove 6 is formed on the main truss 1. There are two sliding plates 7, and the top ends of the two sliding plates 7 are laterally slidably disposed in the first slide groove 6. The first connecting rod 8 is fixedly disposed between the two sliding plates 7 and is located at the bottom end of the sliding plate 7. There are two sliding sleeves 9, which are symmetrically distributed from left to right. The rear end of the sliding sleeve 9 is sleeved on the first connecting rod 8, and the front end of the sliding sleeve 9 is sleeved on the fixed shaft 5. The sliding sleeve 9 is fixedly connected to the hexagonal block mounting slot 4.

[0027] The hexagonal block mounting slot 4 is fixedly connected to the sliding sleeve 9. The sliding sleeve 9 is fitted onto the first connecting rod 8 at the bottom and onto the fixed shaft 5 at the top. The sliding sleeve 9 can only move laterally. The stable lateral displacement of the sliding plate 7 within the first sliding groove 6 can drive the sliding sleeve 9 to move laterally, thereby adjusting the position of the hexagonal block mounting slot 4 laterally. Each hexagonal block mounting slot 4 is equipped with a corresponding lateral adjustment component, and the distance between each hexagonal block mounting slot 4 can be adjusted according to the on-site construction conditions.

[0028] In a relatively specific embodiment, the lateral adjustment assembly further includes an extension plate 10 and a first threaded rod 11. Two extension plates 10 are provided, and the two extension plates 10 are respectively fixedly disposed at the left and right ends above the first slide groove 6. The first threaded rod 11 is rotatably installed between the two extension plates 10. The top end of the sliding plate 7 extends to the space between the two extension plates 10, and the top end of the sliding plate 7 is threadedly connected to the first threaded rod 11.

[0029] The extension plate 10 is fixed on the main truss 1. The first threaded rod 11 is rotatably installed between the two extension plates 10. One end of the first threaded rod 11 extends to the outside of the extension plate 10, and a handle is provided at the top of the extension part of the first threaded rod 11 to facilitate the construction personnel to drive the first threaded rod 11 to rotate. The top of the sliding plate 7 is threadedly connected to the threaded rod. The rotation of the first threaded rod 11 can drive the sliding plate 7 to move laterally in the first sliding groove 6, thereby driving the sliding sleeve 9 to move laterally. The sliding sleeve 9 is fixedly connected to the hexagonal block mounting slot 4, so as to realize the stable adjustment of the lateral position of the hexagonal block mounting slot 4 through the first threaded rod 11, further improving the construction accuracy.

[0030] In this embodiment, the lifting structure includes a rotating sleeve 12, an upper fixing rod 13, a lower fixing rod 14, a second connecting rod 15, and a lifting plate 16. Two rotating sleeves 12 are provided, and the two rotating sleeves 12 are symmetrically distributed on the fixed shaft 5. A sliding sleeve 9 is located between the two rotating sleeves 12, and one end of the rotating sleeve 12 is in contact with the sliding sleeve 9. The upper fixing rod 13 is fixedly installed at the top of the rotating sleeve 12, and the lower fixing rod 14 is fixedly installed at the bottom of the rotating sleeve 12. The second connecting rod 15 is fixedly installed between the two upper fixing rods 13. The lifting plate 16 is fixedly installed at the bottom end of the lower fixing rod 14, and the front side of the lifting plate 16 can contact the rear side of the hexagonal block mounting slot 4.

[0031] The rotation of the rotating sleeve 12 can drive the upper fixed rod 13 and the lower fixed rod 14 to rotate simultaneously. In the lifting state, the lower fixed rod 14 rotates around the axis of the fixed shaft 5. The lifting plate 16 at the bottom of the lower fixed rod 14 is located behind the hexagonal block mounting slot 4 and contacts the hexagonal block mounting slot 4. It stably pushes the hexagonal block mounting slot 4 away from the bottom plane of the arch frame and forms a gap along the slope of the roadbed. When it is necessary to adjust the position of the hexagonal block mounting slot 4 laterally or remove the device, the rotating sleeve 12 rotates in the opposite direction, which can make room at the bottom of the hexagonal block mounting slot 4, so that the construction personnel can pull down the first row of hexagonal blocks to fit with the bottom of the arch frame, which is convenient for the subsequent lateral adjustment of the position of the hexagonal blocks.

[0032] In this embodiment, the lifting structure also includes a pressure rod 17, which is fixedly mounted on the top of the upper fixing rod 13. The pressure rod 17 is arc-shaped, and the top of the upper fixing rod 13 is located behind the top of the pressure rod 17. The bottom of the pressure rod 17 can contact the rear inclined surface inside the hexagonal block.

[0033] After the main truss 1 is fixed to the arched frame, and the lifting structure creates a gap between the hexagonal block mounting slot 4 and the bottom of the arched frame, the construction workers can place the hexagonal block into the hexagonal block mounting slot 4 and lift it between the two pressure rods 17. The inclined surfaces on both sides of the bottom of the hexagonal block contact the arc surface of the top of the pressure rod 17, aligning the hexagonal block with the center of the hexagonal block mounting slot 4. During the lowering process, the arc surface of the pressure rod 17 also guides the hexagonal block, making it easier for the construction workers to put the hexagonal block into the hexagonal block mounting slot 4.

[0034] When adjusting the lateral position of the first row of hexagonal blocks, the bottom end of the pressure rod 17 is above the hexagonal block. Rotating the rotating sleeve 12, the lifting plate 16 at the bottom of the rotating sleeve 12 moves away from the hexagonal block mounting slot 4. At this time, the two pressure rods 17 rotate synchronously and contact the inclined surface on the rear side inside the hexagonal block. This can stably pull the hexagonal block down along the slope of the roadbed edge until it fits against the bottom plane of the arch frame. A gap is formed between the first row of hexagonal blocks and the second row of hexagonal blocks, which facilitates the adjustment of the lateral position of the first row of hexagonal blocks. At this time, the second row of hexagonal blocks is supported by the roadbed slope and will not slide down, affecting the adjustment of the lateral position of the first row of hexagonal blocks.

[0035] In a relatively specific embodiment, the lifting structure also includes a fixed seat 18, a push plate 19, a second slide groove 20, a second threaded rod 21, and a limiting rod 22. The fixed seat 18 is fixedly installed on the front side of the main truss 1, the push plate 19 is located below the fixed seat 18, the second slide groove 20 is opened on the push plate 19, the second connecting rod 15 is slidably sleeved in the second slide groove 20 in the front-back direction, the bottom end of the second threaded rod 21 passes through the fixed seat 18 and is rotatably connected to the push plate 19, the second threaded rod 21 is threadedly connected to the fixed seat 18, and the limiting rod 22 passes through the fixed seat 18 and is fixedly connected to the push plate 19. The limiting rod 22 is located on the front side of the threaded rod.

[0036] The second threaded rod 21 is threadedly connected to the fixed seat 18. When the second threaded rod 21 is rotated, the bottom end of the second threaded rod 21 moves downward. The second threaded rod 21 pushes the push plate 19 to move downward. The push plate 19 is limited and stably moved downward by the limiting rod 22. The second connecting rod 15, which is sleeved in the second slide groove 20, is driven by the push plate 19. The second connecting rod 15 is fixedly connected to the upper fixed rod 13. The upper fixed rod 13 is driven by the push plate 19. The upper fixed rod 13 rotates around the axis of the fixed shaft 5. The pressure rod 17 rotates with the upper fixed rod 13 and contacts the hexagonal block, stably pressing the hexagonal block down. The hexagonal block moves obliquely backward along the slope of the roadbed until it fits against the bottom plane of the arch frame.

[0037] In this embodiment, the lateral adjustment component also includes a third slide groove 23. The front side of the slide sleeve 9 is provided with a third slide groove 23, and the fixed shaft 5 is slidably disposed in the third slide groove 23 in the front-back direction.

[0038] When the hexagonal block is pressed down by the pressure bar 17, the hexagonal block mounting slot 4 moves backward along the slope of the roadbed in sync with the hexagonal block, and the sliding sleeve 9 moves with the hexagonal block mounting slot 4. The fixed shaft 5 moves laterally relative to the sliding sleeve 9 in the third sliding groove 23.

[0039] The technical scope of this utility model is not limited to the contents of the above description. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this utility model, and all such modifications and variations should fall within the scope of this utility model.

Claims

1. A precise positioning device for installing hexagonal blocks of an arched frame, characterized in that, It includes a main truss (1), a positioning clamp (2), an adjusting bolt (3), and a hexagonal block mounting slot (4). There are two positioning clamps (2), which are fixedly installed at the left and right ends of the main truss (1), respectively. The adjusting bolt (3) is set on the positioning clamp (2), and the hexagonal block mounting slot (4) is installed at the bottom of the main truss (1).

2. The precise positioning device for installing hexagonal blocks of an arched frame as described in claim 1, characterized in that, The opening of the positioning clamp (2) faces downward, and multiple hexagonal block mounting slots (4) are provided. The hexagonal block mounting slots (4) are distributed from left to right on the main truss (1).

3. The precise positioning device for installing hexagonal blocks of an arched frame as described in claim 2, characterized in that, It also includes a fixed shaft (5), a lifting structure and a lateral adjustment assembly. The fixed shaft (5) is located on the front side of the main truss (1). The fixed shaft (5) is fixedly installed between the two positioning clamps (2). The lifting structure is provided with multiple hexagonal block mounting slots (4). The lifting structure is sleeved on the fixed shaft (5). The lateral adjustment assembly is provided with multiple hexagonal block mounting slots (4). The lateral adjustment assembly is laterally slidably installed on the main truss (1).

4. The precise positioning device for installing hexagonal blocks of an arched frame as described in claim 3, characterized in that, The lateral adjustment assembly includes a first slide groove (6), a sliding plate (7), a first connecting rod (8), and a sliding sleeve (9). The first slide groove (6) is opened on the main truss (1). There are two sliding plates (7), and the top ends of the two sliding plates (7) are laterally slidably disposed in the first slide groove (6). The first connecting rod (8) is fixedly disposed between the two sliding plates (7) and is located at the bottom end of the sliding plate (7). There are two sliding sleeves (9), and the two sliding sleeves (9) are symmetrically distributed from left to right. The rear end of the sliding sleeve (9) is sleeved on the first connecting rod (8), and the front end of the sliding sleeve (9) is sleeved on the fixed shaft (5). The sliding sleeve (9) is fixedly connected to the hexagonal block mounting slot (4).

5. The precise positioning device for installing hexagonal blocks of an arched frame as described in claim 4, characterized in that, The lateral adjustment assembly also includes an extension plate (10) and a first threaded rod (11). There are two extension plates (10), which are fixedly disposed at the left and right ends above the first slide groove (6). The first threaded rod (11) is rotatably installed between the two extension plates (10). The top end of the sliding plate (7) extends between the two extension plates (10), and the top end of the sliding plate (7) is threadedly connected to the first threaded rod (11).

6. The precise positioning device for installing hexagonal blocks of an arched frame as described in claim 4, characterized in that, The lifting structure includes a rotating sleeve (12), an upper fixing rod (13), a lower fixing rod (14), a second connecting rod (15), and a lifting plate (16). There are two rotating sleeves (12), which are symmetrically distributed on the fixed shaft (5). The sliding sleeve (9) is located between the two rotating sleeves (12), and one end of the rotating sleeve (12) is in contact with the sliding sleeve (9). The upper fixing rod (13) is fixedly installed at the top of the rotating sleeve (12), and the lower fixing rod (14) is fixedly installed at the bottom of the rotating sleeve (12). The second connecting rod (15) is fixedly installed between the two upper fixing rods (13). The lifting plate (16) is fixedly installed at the bottom end of the lower fixing rod (14). The front side of the lifting plate (16) can contact the rear side of the hexagonal block mounting slot (4).

7. The precise positioning device for installing hexagonal blocks of an arched frame as described in claim 6, characterized in that, The lifting structure also includes a pressure rod (17), which is fixedly installed at the top of the upper fixed rod (13). The pressure rod (17) is arc-shaped, and the top of the upper fixed rod (13) is located behind the top of the pressure rod (17). The bottom of the pressure rod (17) can contact the rear inclined surface inside the hexagonal block.

8. The precise positioning device for installing hexagonal blocks of an arched frame as described in claim 6, characterized in that, The lifting structure also includes a fixed seat (18), a push plate (19), a second slide groove (20), a second threaded rod (21), and a limiting rod (22). The fixed seat (18) is fixedly installed on the front side of the main truss (1). The push plate (19) is located below the fixed seat (18). The second slide groove (20) is opened on the push plate (19). The second connecting rod (15) is slidably sleeved in the second slide groove (20) in the front-back direction. The bottom end of the second threaded rod (21) passes through the fixed seat (18) and is rotatably connected to the push plate (19). The second threaded rod (21) is threadedly connected to the fixed seat (18). The limiting rod (22) passes through the fixed seat (18) and is fixedly connected to the push plate (19). The limiting rod (22) is located on the front side of the threaded rod.

9. The precise positioning device for installing hexagonal blocks of an arched frame as described in claim 6, characterized in that, The lateral adjustment assembly also includes a third slide groove (23), and the front side of the slide sleeve (9) is provided with a third slide groove (23), and the fixed shaft (5) is slidably disposed in the third slide groove (23) in the front-back direction.

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