A high-low grade concrete separation device

Abstract

The application relates to the technical field of building construction, in particular to a high-low grade concrete separating device, which comprises a separating net, a separating steel bar and a tensioning screw rod, the separating net is close to the separating steel bar, the separating steel bar is close to the tensioning screw rod, the separating steel bar is inserted into the beam bottom through the gap between the beam longitudinal reinforcement, the upper end of the separating steel bar is inserted into the installation plate on the gathering plate after penetrating the perforation, the installation plate is inserted into the clamping frame on the installation plate, the clamping frame is in contact with the outer wall of the separating steel bar, the separating steel bar is fixed, then the upper end of the separating net is inserted into the clamping groove, the clamping plate is driven to move by rotating the hand screw bolt, so that the separating net is fixed, the high-grade side concrete side pressure and impact force can be effectively resisted, the problem of separating the high-low grade concrete of the beam column is solved, the length of the separating steel bar and the gathering plate can be reasonably made, a plurality of beam widths and beam heights can be applied, the device is convenient to install and disassemble, and can be recycled.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, specifically to a high- and low-grade concrete separation device. Background Technology

[0002] Separating high and low grade concrete during construction has always been a difficult problem for construction companies. Generally speaking, columns have higher concrete grades and beams and slabs have lower grades. Concrete pouring at the beam-column and column-slab junctions is prone to grade mismatch, which can reduce the structural strength of the columns and pose quality and safety risks.

[0003] Traditional wire mesh isolation construction is cumbersome, resulting in limited working space and poor isolation effectiveness. Therefore, this invention proposes a high- and low-grade concrete separation device to solve these problems. Summary of the Invention

[0004] The purpose of this invention is to provide a high- and low-grade concrete separation device to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a high and low grade concrete separation device, comprising: a separation net, a separation steel bar, and a tie rod, wherein the separation net is close to the separation steel bar, the separation steel bar is close to the tie rod, the separation steel bar is inserted into the bottom of the beam through the gap between the longitudinal reinforcement bars of the beam, and a bundle member is provided at the upper end of the separation steel bar, and the separation steel bar and the separation net are fixed by the bundle member;

[0006] The clustering component includes a clustering plate, a fixing strip, and a mounting plate. The side wall of the clustering plate has a through hole, through which the upper end of the dividing reinforcement passes. The fixing strip is installed at the lower end of the clustering plate and has a clamping groove. The upper end of the dividing mesh is inserted into the clamping groove and fixed by the clamping plate. The mounting plate is snapped onto the upper side of the clustering plate. Several snap-fit ​​frames are evenly slidably connected to the upper end of the mounting plate, and the snap-fit ​​frames are in contact with the upper outer wall of the dividing reinforcement.

[0007] Preferably, a handle is welded to one end of the dividing steel bar, and the handles of adjacent dividing steel bars do not contact each other. One end of the edge dividing steel bar is bent, and the bent section of the edge dividing steel bar is installed parallel to the beam width direction.

[0008] Preferably, the length of the bundled plate is greater than the width of the beam, and the width of the perforation is greater than the diameter of the dividing reinforcement.

[0009] Preferably, a movable hole is provided on the upper front side of the cluster plate. The movable hole is strip-shaped and penetrates the upper and lower sidewalls of the cluster plate. Several teeth are uniformly fixedly installed at the upper end of the movable hole. Fixing blocks are fixedly installed on both the left and right ends of the upper rear side of the cluster plate.

[0010] Preferably, slide rails are fixedly installed on both the left and right sides of the upper end of the fixing strip. The inner end of the slide rail is convex. A threaded cylinder is fixedly installed at one end of each slide rail. Two fixing plates are respectively installed on the left and right sides of the upper end of the fixing strip. A toothed tooth is fixedly installed at the lower end of each fixing plate. A circular hole is opened on the side wall of each fixing plate. A threaded rod is slidably connected in the circular hole. A limit rod is fixedly installed at the lower end of each threaded rod. A fastening nut is threadedly connected to the upper end of each threaded rod. A slider is fixedly installed at the lower end of the two limit rods located at the inner end. A threaded rod is fixedly installed at the lower end of the two limit rods located at the outer end. The outer wall of the threaded rod is threadedly connected to the inner wall of the threaded cylinder. The lower end of the slider is slidably connected to the inner wall of the slide rail.

[0011] Preferably, one end of the fixing strip is threaded with a hand-tightening bolt on both the left and right sides. One end of the hand-tightening bolt is located in the clamping groove and is fixedly installed with a clamping plate. One end of the clamping plate is fixedly installed with a rubber pad.

[0012] Preferably, each of the fixing blocks has an insertion groove at its inner end, a fixing pin is slidably inserted into the upper end of each fixing block, a pull ring is fixedly installed at the upper end of the fixing pin, a spring is sleeved on the outer wall of the fixing pin, the upper end of the spring is fixedly connected to the upper end of the fixing pin, and the lower end of the spring is fixedly connected to the upper end of the fixing block.

[0013] Preferably, the mounting plate has fixing holes on both the left and right sides of its upper end, and both ends of the mounting plate are slidably inserted into the fixing blocks, with the lower end of the fixing pin slidably inserted into the fixing holes.

[0014] Preferably, the upper end of the mounting plate is evenly provided with a plurality of sliding grooves, the sliding grooves are convex, and the bottom inner side of each sliding groove is provided with a groove. A spring 2 is fixedly installed in each groove, and a round block is installed on the upper end of the spring 2. A ball is rotatably connected to the upper end of the round block.

[0015] Preferably, one end of the snap-fit ​​frame is open, and anti-slip pads are fixedly installed on both the left and right sides of the inner end of the snap-fit ​​frame. A positioning rod is fixedly installed at the lower end of the snap-fit ​​frame, and limit blocks are fixedly installed on both the left and right sides of the lower end of the positioning rod. An installation block is provided below the rear end of the snap-fit ​​frame. The installation block is convex, and an installation cylinder is fixedly installed at the upper end of the installation block. A rubber sleeve is fixedly installed inside the installation cylinder. Limit grooves are opened on both the left and right sides of the lower end of the rubber sleeve. The positioning rod and the limit block are inserted into the installation cylinder by squeezing the rubber sleeve.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] By first installing the clustering components on the upper end of the longitudinal beam reinforcement, then placing the partition mesh tightly against the partition reinforcement, which in turn is tightly against the tie rods fixed to the reinforcement cage, the partition reinforcement is inserted into the bottom of the beam through the gaps between the longitudinal reinforcements. After the upper end of the partition reinforcement passes through the perforation, it slides into the mounting plate on the clustering plate, and then slides into the snap-fit ​​frame on the mounting plate. The snap-fit ​​frame contacts the outer wall of the partition reinforcement, fixing it in place. Then, the upper end of the partition mesh is inserted into the clamping groove, and the clamping plate is moved by turning the hand-tightening bolts, thus fixing the partition mesh. This effectively resists the lateral pressure and impact of high-grade concrete, solving the problem of separating high and low grade concrete in beams and columns. The reasonable manufacturing of the partition reinforcement and clustering plate lengths allows for application to various beam widths and heights. Installation and disassembly are convenient, and it is recyclable. Attached Figure Description

[0018] Figure 1 This is a side view of the present invention during installation;

[0019] Figure 2 This is a schematic diagram showing the unfolded separation mesh and separation reinforcement bars of the present invention;

[0020] Figure 3 This is a right view of the clustering component of the present invention;

[0021] Figure 4 This is a left view of the clustering component of the present invention;

[0022] Figure 5 This is a schematic diagram of the bundled plate structure of the present invention;

[0023] Figure 6 This is a three-dimensional schematic diagram of the movable collar structure of the present invention;

[0024] Figure 7 This is a schematic diagram of the snap-fit ​​frame structure of the present invention;

[0025] Figure 8 This is a schematic diagram of the front view of the fixing block of the present invention;

[0026] Figure 9 This is a schematic cross-sectional view of the mounting plate portion of the present invention;

[0027] Figure 10 This is a cross-sectional schematic diagram of the mounting block of the present invention.

[0028] In the diagram: 1. Separating mesh; 2. Separating reinforcing bars; 3. Tie rod; 4. Bundling component; 5. Bundling plate; 6. Perforation; 7. Moving hole; 8. Tooth 1; 9. Fixing plate; 10. Tooth 2; 11. Threaded rod 1; 12. Limiting rod; 13. Fastening nut; 14. Slider; 15. Threaded rod 2; 16. Fixing strip; 17. Clamping groove; 18. Hand-tightening bolt; 19. Clamping plate; 20. Threaded cylinder; 21. Slide rail; 22. Fixing block; 23. Fixing pin; 24. Spring 1; 25. Pull ring; 26. Mounting plate; 27. Fixing hole; 28. Slide groove; 29. ​​Groove; 30. Spring 2; 31. Ball bearing; 32. Mounting block; 33. Mounting cylinder; 34. Rubber sleeve; 35. Snap-fit ​​frame; 36. Positioning rod; 37. Limiting block; 38. Anti-slip pad; 39. Placement groove. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the present invention clear and complete, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some, not all, embodiments of the present invention, and are merely illustrative of the embodiments of the present invention. They are not intended to limit the embodiments of the present invention. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] In the description of this invention, it should be noted that the terms "center," "middle," "upper," "lower," "left," "right," "inner," "outer," "top," "bottom," "side," "vertical," and "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "a," "first," "second," "third," "fourth," "fifth," and "sixth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0031] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0032] For purposes of simplicity and illustration, the principles of the embodiments are described primarily by way of example. In the following description, numerous specific details are set forth to provide a thorough understanding of the embodiments. However, it will be apparent to those skilled in the art that these embodiments may not be limited to these specific details in practice. In some instances, well-known methods and structures have not been described in detail to avoid unnecessarily obscuring these embodiments. Furthermore, all embodiments can be used in combination with each other.

[0033] Please see Figures 1 to 10 This invention provides a technical solution: a high- and low-grade concrete separation device, comprising: a separation net 1, a separation reinforcing bar 2, and tie rods 3. The separation net 1, the separation reinforcing bar 2, and the tie rods 3 are arranged sequentially from the high-grade concrete side to the low-grade concrete side. The separation net 1 is close to the separation reinforcing bar 2, and the separation reinforcing bar 2 is close to the tie rods 3. The tie rods 3 are fixed to the reinforcing cage, serving to support the separation reinforcing bar 2 and the separation net 1. The separation reinforcing bar 2 is inserted into the bottom of the beam through the gap between the longitudinal reinforcement bars of the beam. A bundle member 4 is provided at the upper end of the separation reinforcing bar 2, and the separation reinforcing bar 2 and the separation net 1 are fixed by the bundle member 4. A handle is welded to one end of the separation reinforcing bar 2, and the handles of adjacent separation reinforcing bars do not contact each other, so as to facilitate the removal of the separation reinforcing bar 2. One end of the edge separation reinforcing bar is bent, and the bent section of the edge separation reinforcing bar is installed parallel to the beam width direction, serving to separate the bottom concrete.

[0034] The clustering component 4 includes a clustering plate 5, a fixing strip 16, and a mounting plate 26. The clustering plate 5 has a through hole 6 on its side wall. The clustering plate 5 is placed on the upper end of the longitudinal beam reinforcement. The upper end of the dividing reinforcement 2 passes through the through hole 6. The fixing strip 16 is installed on the lower end of the clustering plate 5 and the longitudinal beam reinforcement. The length of the clustering plate 5 is greater than the beam width, and the width of the through hole 6 is greater than the diameter of the dividing reinforcement 2. A moving hole 7 is provided on the upper front side of the clustering plate 5. The moving hole 7 is strip-shaped and penetrates the upper and lower side walls of the clustering plate 5. Several teeth 8 are evenly fixed at the upper end of the moving hole 7. Fixing blocks 22 are fixedly installed on both the left and right ends of the upper rear side of the clustering plate 5. A clamping groove 17 is provided on the fixing strip 16. Slides 21 are fixedly installed on both the left and right sides of the upper end of the fixing strip 16. The inner end of the slides 21 is convex. A threaded cylinder 20 is fixedly installed at one end of each slide 21. The upper end of the fixing strip 16... Two fixing plates 9 are respectively set on the left and right sides. Each fixing plate 9 has a tooth 10 fixedly installed at the lower end. Each fixing plate 9 has a round hole on its side wall. A threaded rod 11 is slidably connected in the round hole. A limit rod 12 is fixedly installed at the lower end of each threaded rod 11. A fastening nut 13 is threadedly connected to the upper end of each threaded rod 11. A slider 14 is fixedly installed at the lower end of the two limit rods 12 located at the inner end. The slider 14 is convex. A threaded rod 15 is fixedly installed at the lower end of the two limit rods 12 located at the outer end. A hand-tightening bolt 18 is threadedly connected to both the left and right sides of one end of the fixing strip 16. One end of the hand-tightening bolt 18 is located in the clamping groove 17 and a clamping plate 19 is fixedly installed. A rubber pad is fixedly installed at one end of the clamping plate 19. The rubber pad can increase the friction between the clamping plate 19 and the partition net 1, and clamp the partition net 1 more firmly.

[0035] By threading the outer wall of threaded rod 15 to the inner wall of threaded cylinder 20, and sliding the lower end of slider 14 to the inner wall of slide rail 21, the upper end of threaded rod 11 passes through moving hole 7 and upper round hole of fixed plate 9 and is threaded and fastened with nut 13 to fix threaded rod 11 to fixed plate 9. Then, under the action of gravity of fixed bar 16, teeth 10 and 8 at the lower end of fixed plate 9 mesh with each other, fixing limit rod 12 and fixed bar 16. At this time, the limit is achieved. The outer wall of rod 12 contacts the longitudinal beam reinforcement, thereby fixing the bundle plate 5 to the upper end of the longitudinal beam reinforcement and preventing lateral displacement above the longitudinal beam reinforcement. Then, the upper end of the partition net 1 is inserted into the clamping groove 17, and the clamping plate 19 is moved by rotating the hand-tightening bolt 18, thereby fixing the partition net 1. By pulling the threaded rod 11 upward, the tooth 8 and tooth 10 can be separated, and the limiting rod 12 located at the inner end can be moved to facilitate contact with steel bars of different specifications.

[0036] Each fixing block 22 has an insertion groove at its inner end, and a fixing pin 23 is slidably inserted into the upper end of each fixing block 22. A pull ring 25 is fixedly installed on the upper end of the fixing pin 23. A spring 24 is sleeved on the outer wall of the fixing pin 23. The upper end of the spring 24 is fixedly connected to the upper end of the fixing pin 23, and the lower end of the spring 24 is fixedly connected to the upper end of the fixing block 22. A ramp is provided at the lower end of the fixing pin 23. When the spring 24 is in a balanced state, the lower end of the fixing pin 23 is located in the insertion groove. By pinching the pull ring 25 and pulling upward, the lower end of the fixing pin 23 can be pulled out of the insertion groove. Fixing holes 27 are provided on both the left and right sides of the upper end of the mounting plate 26. Both ends of the mounting plate 26 are slidably inserted into the fixing block 22, and the lower end of the fixing pin 23 is slidably inserted into the fixing hole 27 to fix the mounting plate 26. When it is necessary to remove the mounting plate 26, pinch the pull ring 25 and pull upward, which facilitates the installation and removal of the mounting plate 26.

[0037] The upper end of the mounting plate 26 is evenly provided with several sliding grooves 28. The sliding grooves 28 are convex. The bottom inner side of each sliding groove 28 is provided with a groove 29. A spring 30 is fixedly installed in each groove 29. A round block is installed on the upper end of the spring 30. A ball 31 is rotatably connected to the upper end of the round block. When the spring 30 is in a balanced state, the upper end of the round block is flush with the upper end of the groove 29. The upper end of the ball 31 is located in the sliding groove 28. The ball 31 can enter the groove 29 by compressing the spring 30.

[0038] One end of the snap-fit ​​frame 35 is open. Anti-slip pads 38 are fixedly installed on both the left and right sides of the inner end of the snap-fit ​​frame 35. An arc-shaped placement groove 39 is provided at the inner end of the anti-slip pads 38. A positioning rod 36 is fixedly installed at the lower end of the snap-fit ​​frame 35. Limit blocks 37 are fixedly installed on both the left and right sides of the lower end of the positioning rod 36. An installation block 32 is provided at the lower rear end of the snap-fit ​​frame 35. The installation block 32 is convex. An installation cylinder 33 is fixedly installed at the upper end of the installation block 32. A rubber sleeve 34 is fixedly installed inside the installation cylinder 33. Limit blocks are provided on both the left and right sides of the lower end of the rubber sleeve 34. The groove, positioning rod 36 and limiting block 37 are inserted into the mounting cylinder 33 by squeezing the rubber sleeve 34. At the same time, the limiting block 37 is located in the limiting groove, fixing the snap-fit ​​frame 35 in the mounting block 32. One end of the mounting block 32 slides in the sliding groove 28, while the mounting block 32 passes over the ball 31. The front end of the mounting block 32 contacts the inner wall of the frontmost end of the sliding groove 28, and the rear end contacts the ball 31. At the same time, the snap-fit ​​frame 35 is inserted into the outer wall of the dividing steel bar. The dividing steel bar enters the placement groove 39 by squeezing the anti-slip pad 38, thereby fixing the upper end of the dividing steel bar 2.

[0039] When this device is in operation, the clustering component 4 is first installed on the upper end of the longitudinal beam reinforcement. The separator mesh 1 is then placed close to the separator reinforcement 2, which is in turn placed close to the tie rod 3. The tie rod 3 is fixed to the reinforcement cage. The separator reinforcement 2 is inserted into the bottom of the beam through the gap between the longitudinal reinforcements. After the upper end of the separator reinforcement 2 passes through the through hole 6, it slides into the mounting plate 26 on the clustering plate 5. The snap-fit ​​frame 35 slides into the mounting plate 26 and contacts the outer wall of the separator reinforcement 2, thus fixing the separator reinforcement 2. Then, the upper end of the separator mesh 1 is inserted into the clamping groove 17, and the clamping plate 19 is moved by rotating the hand-tightening bolt 18, thereby fixing the separator mesh 1. This device can effectively resist the side pressure and impact of high-grade concrete, solving the problem of separating high and low grade concrete in beams and columns. The separator reinforcement and the length of the clustering plate 5 are reasonably made, which can be used for various beam widths and heights. It is easy to install and disassemble and can be recycled.

[0040] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high- and low-grade concrete separation device, comprising: The partition net (1), the partition steel bar (2) and the tie rod (3) are characterized in that: the partition net (1) is close to the partition steel bar (2), the partition steel bar (2) is close to the tie rod (3), the partition steel bar (2) is inserted into the bottom of the beam through the gap between the longitudinal bars of the beam, and a bundle member (4) is provided at the upper end of the partition steel bar (2), and the partition steel bar (2) and the partition net (1) are fixed by the bundle member (4); The clustering component (4) includes a clustering plate (5), a fixing strip (16), and a mounting plate (26). A through hole (6) is provided on the side wall of the clustering plate (5). The upper end of the dividing steel bar (2) passes through the through hole (6). The fixing strip (16) is installed at the lower end of the clustering plate (5). A clamping groove (17) is provided on the fixing strip (16). The upper end of the dividing mesh (1) is inserted into the clamping groove (17) and fixed by the clamping plate (19). The mounting plate (26) is snapped onto one side of the upper end of the clustering plate (5). Several snap-fit ​​frames (35) are evenly slidably connected to the upper end of the mounting plate (26). The snap-fit ​​frames (35) are in contact with the upper outer wall of the dividing steel bar (2). The upper front side of the cluster plate (5) is provided with a moving hole (7). The moving hole (7) is strip-shaped and penetrates the upper and lower side walls of the cluster plate (5). Several teeth (8) are uniformly fixed at the upper port of the moving hole (7). Fixing blocks (22) are fixedly installed at both the left and right ends of the upper rear side of the cluster plate (5). The upper left and right sides of the fixing strip (16) are fixedly installed with slide rails (21). The inner end of the slide rail (21) is convex. A threaded cylinder (20) is fixedly installed at one end of each slide rail (21). Two fixing plates (9) are respectively installed on the upper left and right sides of the fixing strip (16). A toothed tooth (10) is fixedly installed at the lower end of each fixing plate (9). A round hole is opened on the side wall of each fixing plate (9). A threaded rod (11) is slidably connected in the round hole. Each threaded rod Each threaded rod (11) has a fixed limit rod (12) at its lower end and a fastening nut (13) at its upper end. The two limit rods (12) at the inner end are fixedly fitted with sliders (14), and the two limit rods (12) at the outer end are fixedly fitted with threaded rods (15). The outer wall of threaded rods (15) is threadedly connected to the inner wall of threaded cylinder (20), and the lower end of sliders (14) is slidably connected to the inner wall of slide rail (21). The fixing strip (16) has a hand-tightening bolt (18) threaded on both the left and right sides of one end. One end of the hand-tightening bolt (18) is located in the clamping groove (17) and is fixedly installed with a clamping plate (19). One end of the clamping plate (19) is fixedly installed with a rubber pad.

2. The high and low grade concrete separation device according to claim 1, characterized in that: The dividing steel bar (2) has a handle welded to one end. The handles of adjacent dividing steel bars do not contact each other. One end of the side dividing steel bar is bent, and the bent section of the side dividing steel bar is installed parallel to the beam width direction.

3. The high and low grade concrete separation device according to claim 1, characterized in that: The length of the bundled plate (5) is greater than the beam width, and the width of the perforation (6) is greater than the diameter of the dividing reinforcement (2).

4. The high and low grade concrete separation device according to claim 1, characterized in that: Each of the fixing blocks (22) has an insertion groove at its inner end, and a fixing pin (23) is slidably inserted into the upper end of each fixing block (22). A pull ring (25) is fixedly installed on the upper end of the fixing pin (23). A spring (24) is sleeved on the outer wall of the fixing pin (23). The upper end of the spring (24) is fixedly connected to the upper end of the fixing pin (23), and the lower end of the spring (24) is fixedly connected to the upper end of the fixing block (22).

5. A high- and low-grade concrete separation device according to claim 1, characterized in that: Fixing holes (27) are provided on both the left and right sides of the upper end of the mounting plate (26). Both ends of the mounting plate (26) are slidably inserted into the fixing block (22), and the lower end of the fixing pin (23) is slidably inserted into the fixing hole (27).

6. A high- and low-grade concrete separation device according to claim 1, characterized in that: The upper end of the mounting plate (26) is evenly provided with several sliding grooves (28). The sliding grooves (28) are convex. The bottom inner side of each sliding groove (28) is provided with a groove (29). A second spring (30) is fixedly installed in each groove (29). A round block is installed at the upper end of the second spring (30). A ball bearing (31) is rotatably connected to the upper end of the round block.

7. A high- and low-grade concrete separation device according to claim 6, characterized in that: One end of the snap-fit ​​frame (35) is open. Anti-slip pads (38) are fixedly installed on both the left and right sides of the inner end of the snap-fit ​​frame (35). A positioning rod (36) is fixedly installed at the lower end of the snap-fit ​​frame (35). Limiting blocks (37) are fixedly installed on both the left and right sides of the lower end of the positioning rod (36). An installation block (32) is provided below the rear end of the snap-fit ​​frame (35). The installation block (32) is convex. An installation cylinder (33) is fixedly installed at the upper end of the installation block (32). A rubber sleeve (34) is fixedly installed inside the installation cylinder (33). Limiting grooves are opened on both the left and right sides of the lower end of the rubber sleeve (34). The positioning rod (36) and the limiting block (37) are inserted into the installation cylinder (33) by squeezing the rubber sleeve (34).

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