Movable urban comprehensive pipe gallery formwork inner supporting device

Abstract

The utility model discloses a movable urban comprehensive pipe gallery formwork inner supporting device, and belongs to the technical field of formwork supporting. Comprising two sets of outer side formworks which are arranged in parallel. The device further comprises a supporting platform, the supporting platform is installed between the two sets of outer side formworks, a vertical hydraulic supporting rod is installed in the middle of the supporting platform, a first transverse hydraulic set and a second transverse hydraulic set are symmetrically installed on the two sides of the vertical hydraulic supporting rod, and the output end of the first transverse hydraulic set and the output end of the second transverse hydraulic set are detachably connected with inner plastic formworks. The inner plastic template and the outer side template are arranged in parallel; a first synchronous part is installed on the first transverse hydraulic set, a second synchronous part is installed on the second transverse hydraulic set, a mounting groove is formed in the supporting platform, and the first synchronous part and the second synchronous part synchronously move in the mounting groove. The technical problem that the flatness of the pipe gallery side wall is poor in the pipe gallery construction pouring process is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of template support and relates to a movable inner support device for a city integrated pipe gallery template. Background Art

[0002] Currently, in the construction of urban utility corridors, wooden formwork and tension bolts are often used to secure the side walls. This method is cumbersome and prone to uneven thickness due to uneven force applied to the tension bolts. This can lead to poor sidewall flatness and severely impact the quality of the power corridor.

[0003] In view of the defects existing in the above-mentioned pipeline corridor construction, the utility model uses a simple device to design a movable and foldable integrated pipeline corridor template internal support device from an economic and practical perspective. The support system can realize the one-time casting of the side wall, reducing the complexity of step-by-step construction, thereby improving the overall construction efficiency.

[0004] In summary, the present invention proposes a movable internal support device for an urban integrated pipe gallery template. Summary of the Invention

[0005] This utility model provides a movable internal support device for urban integrated pipe corridor formwork. It avoids the shortcomings of traditional formwork support systems, significantly saves manpower and material resources, and better ensures the quality of concrete construction. The design of the new pipe corridor formwork construction support device takes into account the needs of rapid installation and removal, which can significantly shorten construction time and improve project progress.

[0006] In order to solve the above technical problems, the inventors have come up with the technical solution of the present utility model through practice and summary. The present utility model discloses that the basic concept of the technical solution adopted by the present utility model to solve the above technical problems is:

[0007] A movable and foldable inner support device for an urban integrated pipe gallery template comprises two sets of outer templates, which are arranged in parallel.

[0008] It also includes a support platform, which is installed between the two sets of outer templates. A vertical hydraulic support rod is installed in the middle of the support platform. A horizontal hydraulic group 1 and a horizontal hydraulic group 2 are symmetrically installed on both sides of the vertical hydraulic support rod. The output ends of the horizontal hydraulic group 1 and the horizontal hydraulic group 2 are both detachably connected to the inner plastic template; the inner plastic template and the outer template are arranged in parallel;

[0009] The first lateral hydraulic group is installed with a synchronizer, the second lateral hydraulic group is installed with a synchronizer, and a mounting groove is opened on the support platform. The first synchronizer and the second synchronizer move synchronously in the mounting groove.

[0010] In a further technical solution, the transverse hydraulic group 1 includes a hydraulic rod 1 and a hydraulic rod 2, and the output ends of the hydraulic rod 1 and the hydraulic rod 2 are both installed with a support plate 1, and the support plate 1 and the output end of the hydraulic rod 1 or the hydraulic rod 2 are fixedly installed with a rib plate;

[0011] The side of the support plate facing away from the vertical hydraulic support rod is connected to the inner plastic template;

[0012] The hydraulic rod 1 is located above the hydraulic rod 2, and a wing plate is fixedly installed between the hydraulic rod 1 and the vertical hydraulic support rod.

[0013] In a further technical solution, the transverse hydraulic group 2 includes a hydraulic rod 3 and a hydraulic rod 4, and the output ends of the hydraulic rod 3 and the hydraulic rod 4 are both installed with a support plate 2, and the support plate 2 and the output end of the hydraulic rod 3 or the hydraulic rod 4 are fixedly installed with a rib plate;

[0014] The side of the second support plate facing away from the vertical hydraulic support rod is connected to the inner plastic formwork;

[0015] The hydraulic rod three is located above the hydraulic rod four, and a wing plate is fixedly installed between the hydraulic rod three and the vertical hydraulic support rod.

[0016] In a further technical solution, a mounting seat is installed at the bottom of the support platform, and a universal wheel is installed at the bottom of the mounting seat.

[0017] In a further technical solution, the synchronizer 1 includes a threaded rod and a sliding plate 1, the synchronizer 2 includes a connecting member and a sliding plate 2, and the bottom of the threaded rod is detachably connected to the sliding plate 1 or the sliding plate 2;

[0018] The sliding plate 1 is provided with a connecting portion 1, and the sliding plate 2 is provided with a connecting portion 2; the connecting portion 1 and the connecting portion 2 are both located in the mounting groove, and are provided with transverse racks facing each other;

[0019] A rotating gear is installed in the installation groove, and the transverse rack is meshed with the rotating gear;

[0020] The threaded rod located on sliding plate one is suitable for correspondingly passing through the output parts of hydraulic rod one and hydraulic rod two, and the threaded rod located on sliding plate two is suitable for passing through the output parts of hydraulic rod three and hydraulic rod four, and is locked on the corresponding output parts through the installation position nut.

[0021] In a further technical solution, a bracket is installed in the middle of the support platform, and a notch is provided on the top of the bracket and is fixedly connected to the bottom of the vertical hydraulic support rod;

[0022] An extension plate is installed at the output portion of the vertical hydraulic support rod, and hydraulic rod 1 and hydraulic rod 3 are installed on both sides of the extension plate respectively;

[0023] The bottom of the bracket is provided with a cavity suitable for the installation groove to pass through; the rotating gear is located at the bottom of the bracket.

[0024] In a further technical solution, the bottoms of the sliding plate 1 and the sliding plate 2 are both provided with track grooves, and guide bars are provided in the mounting grooves, the guide bars are adapted to the track grooves, and the sliding plate 1 and the sliding plate 2 slide on the guide bars accordingly.

[0025] In a further technical solution, a fixed shaft is installed axially of the rotating gear, the fixed shaft is fixedly connected to the support platform, a connecting bearing is installed on the fixed shaft, the rotating gear is connected to the outer ring of the connecting bearing, and the fixed shaft is connected to the inner ring of the connecting bearing;

[0026] A threaded short shaft is provided on the top of the fixed shaft, and a retaining plate is installed on the threaded short shaft. The retaining plate is a bent plate, and a limiting tooth shape is installed on the bottom; the limiting tooth shape is movably engaged with the rotating gear, and the top of the retaining plate is sleeved on the threaded short shaft and fixed by a nut.

[0027] Beneficial effects

[0028] The utility model has the following advantages:

[0029] Compared with the existing formwork support technology, this device has a simple structure, easy installation, and a foldable design that facilitates transportation and movement, avoiding frequent dismantling and erection during the installation process. It can be quickly put into place, saving a lot of time and labor costs.

[0030] Secondly, two sets of threaded rods can be used to fix the horizontal hydraulic rods on the same side of the vertical hydraulic support rods, maintaining a fixed output position and reducing the problem of hydraulic rod pressure reduction failure. Synchronous movement of the gear rack and pinion towards or away from each other ensures that the output power of the horizontal hydraulic groups on both sides remains consistent, which promotes the consistency of the pipe gallery casting and reduces the problem of uneven wall thickness caused by excessive compression on one side.

[0031] Furthermore, by engaging the limiting tooth shape of the positioning member with the rotating gear, the position of the rotating gear is limited, thereby achieving the effect of keeping the positions of the two sets of sliding plates relatively fixed, reducing the probability of position movement of the two sets of threaded rods, and achieving a stable casting effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0033] Figure 1 This is a front view of the working example 1 of the utility model Figure 1 ;

[0034] Figure 2 This is a front view of the working example 1 of the utility model Figure 2 ;

[0035] Figure 3 This is a front view of the working embodiment 2 of the present utility model;

[0036] Figure 4 This is a top view schematic diagram of the connection between the sliding plate 1 and the sliding plate 2 on the support platform of Example 2 of the utility model and the rotating gear;

[0037] Figure 5 This is a structural diagram of a sliding plate 1 of the present invention;

[0038] Figure 6 This is a schematic diagram of the connection between the rotating gear, the fixed shaft and the positioning plate of the present invention;

[0039] Figure 7 Schematic diagram of the meshing between the rotating gear and the positioning plate.

[0040] In the figure: 1. Support platform; 2. Vertical hydraulic support rod; 3. Mounting slot; 4. Hydraulic rod 1; 5. Hydraulic rod 2; 6. Support plate 1; 7. Rib plate; 8. Wing plate; 9. Hydraulic rod 3; 10. Hydraulic rod 4; 11. Support plate 2; 12. Mounting base; 13. Universal wheel;

[0041] 14. Sliding plate 1; 15. Sliding plate 2; 16. Threaded rod; 17. Connecting part 1; 18. Connecting part 2; 19. Horizontal rack; 20. Rotating gear; 21. Position nut; 22. Bracket; 23. Extension plate; 24. Track groove; 25. Guide bar; 26. Fixed shaft; 27. Connecting bearing; 28. Threaded short shaft; 29. ​​Positioning plate; 30. Limiting tooth profile;

[0042] 100, outer formwork; 200, inner plastic formwork. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0044] The application principle of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0045] Example 1

[0046] like Figure 1-2As shown, an embodiment of the present invention is a movable and foldable inner support device for a city integrated pipe gallery template, comprising two sets of outer templates 100, the two sets of outer templates 100 being arranged in parallel;

[0047] The structure further comprises a support platform 1, which is installed between two sets of outer formwork 100. A vertical hydraulic support rod 2 is installed in the middle of the support platform 1. A transverse hydraulic group 1 and a transverse hydraulic group 2 are symmetrically installed on both sides of the vertical hydraulic support rod 2. The output ends of the transverse hydraulic group 1 and the transverse hydraulic group 2 are both detachably connected to the inner plastic formwork 200. The inner plastic formwork 200 and the outer formwork 100 are arranged in parallel.

[0048] Synchronous component 1 is installed on transverse hydraulic group 1, and synchronizer 2 is installed on transverse hydraulic group 2. A mounting groove 3 is opened on the support platform 1, and synchronizer 1 and synchronizer 2 move synchronously in the mounting groove 3.

[0049] In a further technical solution, the transverse hydraulic group 1 includes a hydraulic rod 1 4 and a hydraulic rod 2 5, and the output ends of the hydraulic rod 1 4 and the hydraulic rod 2 5 are both installed with a support plate 1 6, and the support plate 1 6 and the output end of the hydraulic rod 1 4 or the hydraulic rod 2 5 are fixedly installed with a rib 7;

[0050] The side of the support plate 1 6 facing away from the vertical hydraulic support rod 2 is connected to the inner plastic template 200;

[0051] The hydraulic rod 1 4 is located above the hydraulic rod 2 5 , and a wing plate 8 is fixedly installed between the hydraulic rod 1 4 and the vertical hydraulic support rod 2 .

[0052] In a further technical solution, the transverse hydraulic group 2 includes a hydraulic rod 3 9 and a hydraulic rod 4 10, and the output ends of the hydraulic rod 3 9 and the hydraulic rod 4 10 are both installed with a support plate 2 11, and the support plate 2 11 and the output end of the hydraulic rod 3 9 or the hydraulic rod 4 10 are fixedly installed with a rib 7;

[0053] The side of the support plate 2 11 facing away from the vertical hydraulic support rod 2 is connected to the inner plastic template 200;

[0054] The hydraulic rod three 9 is located above the hydraulic rod four 10 , and a wing plate 8 is fixedly installed between the hydraulic rod three 9 and the vertical hydraulic support rod 2 .

[0055] In a further technical solution, a mounting seat 12 is installed at the bottom of the supporting platform 1 , and a universal wheel 13 is installed at the bottom of the mounting seat 12 .

[0056] The universal wheels installed under the support platform are designed to facilitate the installation of vertical hydraulic support rods on the support platform. These rods are flanked by upper and lower horizontal hydraulic groups, each connected by an "I"-shaped, foldable support rod. The design of the support assembly ensures the stability of the entire formwork system, allowing the formwork to withstand pressure from all directions without deformation or displacement during the concrete pouring process.

[0057] Compared with the existing formwork support technology, this device has a simple structure, easy installation, and a foldable design that facilitates transportation and movement, avoiding frequent dismantling and erection during the installation process. It can be quickly put into place, saving a lot of time and labor costs.

[0058] The tunnel formwork support system is designed to accommodate tunnels of varying sizes and shapes. It utilizes an "I"-shaped telescopic connection, resulting in high adaptability. This means the same support system can be used for different construction projects, improving equipment utilization and economic efficiency. The inner plastic formwork 200 and outer plastic formwork 100 are paired together, acting as the formwork for pouring within their gaps.

[0059] The inner plastic formwork 200 adopts a rigid new plastic formwork with good integrity, uniform stress, small deformation under stress, and can be used multiple times. It can better control the molding quality of the pipe corridor and ensure that the size and shape of the structure meet the design requirements, thereby ensuring the quality of the project. By using standardized and modular support devices, the formwork is connected by snap-fit ​​connections, which reduces the gap between the formworks and is beneficial to the overall aesthetics of the exterior. Since there are no splicing gaps as a whole, it is beneficial to the waterproof performance of the side walls. The inner membrane support device of the utility model adopts semi-automatic operation. The inner plastic formwork support is telescopically adjusted by hydraulic pressure for demoulding. The construction operation is simple. At the same time, due to the reusability of the device, it can save a lot of money for the project in the long run. Reduce labor costs and improve production efficiency.

[0060] First, the reinforcement of the bottom plate of the integrated pipe corridor is tied, and the hardening and side wall reinforcement are tied. Use a car crane to lift the internal support device to the top of the bottom plate of the pipe corridor, and then manually run this application to the specified position, run the vertical hydraulic support rod to the specified height, and connect the inner plastic formwork 200 through the horizontal hydraulic group respectively, control the distance between the inner plastic formwork 200 and the outer formwork 100, and after tying and fixing, pour the pipe corridor concrete. After the concrete reaches the strength, run the horizontal hydraulic group to disassemble and retract the vertical hydraulic support rod, remove the inner plastic formwork 200, and realize the overall demoulding of the inner membrane. Repeat this operation to complete the next section of the pipe corridor. Therefore, this internal support device saves manpower and material resources during the pouring construction of the integrated pipe corridor, and at the same time improves the construction quality of the integrated pipe corridor.

[0061] Example 2

[0062] like Figure 3-7 As shown, another implementation scheme of the present invention is based on Example 1, in order to overcome the pressure release of the hydraulic rod, a mechanical locking effect is achieved to maintain the stability of casting performance.

[0063] like Figure 4 As shown, the synchronizer 1 includes a threaded rod 16 and a sliding plate 14, and the synchronizer 2 includes a connecting member and a sliding plate 2 15. The bottom of the threaded rod 16 is detachably connected to the sliding plate 14 or the sliding plate 2 15; a connecting portion 17 is provided on the sliding plate 14, and a connecting portion 2 18 is provided on the sliding plate 2 15; the connecting portion 17 and the connecting portion 2 18 are both located in the mounting groove 3, and transverse racks 19 are provided facing each other; a rotating gear 20 is installed in the mounting groove 3, and the transverse rack 19 is engaged with the rotating gear 20; the structure of the sliding plate 1 is referred to as Figure 5 As shown, the sliding plate 1 and the sliding plate 2 have the same structure and are installed in a centrally symmetrical manner.

[0064] The threaded rod 16 located on the sliding plate 14 is suitable for correspondingly passing through the output parts of the hydraulic rod 1 4 and the hydraulic rod 2 5. The threaded rod 16 located on the sliding plate 2 15 is suitable for passing through the output parts of the hydraulic rod 3 9 and the hydraulic rod 4 10, and is locked on the corresponding output part by the installation position nut 21. The two groups of threaded rods can be used to fix the hydraulic rods arranged laterally on the same side of the vertical hydraulic support rod, keep the output position fixed, and reduce the problem of hydraulic rod pressure reduction failure. Synchronously, the gear rack performs synchronous movement in opposite directions, thus ensuring that the output power of the horizontal hydraulic groups on both sides remains consistent, which is beneficial to the consistency of the pipe gallery casting and reduces the problem of different wall thicknesses caused by more compression on one side.

[0065] like Figure 3 As shown, a bracket 22 is installed in the middle of the support platform 1, and a notch is provided on the top of the bracket 22 and fixedly connected to the bottom of the vertical hydraulic support rod 2; an extension plate 23 is installed on the output portion of the vertical hydraulic support rod 2, and hydraulic rods 1 4 and 3 9 are installed on both sides of the extension plate 23; Figure 4 As shown, a cavity is provided at the bottom of the bracket 22 , and is suitable for the installation slot 3 to pass through; the rotating gear 20 is located at the bottom of the bracket 22 .

[0066] The bottom of the sliding plate 14 and the sliding plate 2 15 are both provided with a track groove 24, and a guide bar 25 is provided in the mounting groove 3. The guide bar 25 is adapted to the track groove 24, and the sliding plate 14 and the sliding plate 2 15 slide on the guide bar 25 accordingly. Figure 6As shown, a fixed shaft 26 is installed axially on the rotating gear 20. The fixed shaft 26 is fixedly connected to the support platform 1. A connecting bearing 27 is installed on the fixed shaft 26. The rotating gear 20 is connected to the outer ring of the connecting bearing 27, and the fixed shaft 26 is connected to the inner ring of the connecting bearing 27. A threaded short shaft 28 is provided on the top of the fixed shaft 26. A retaining plate 29 is mounted on the threaded short shaft 28. The retaining plate 29 is a bent plate with a limiting tooth profile 30 installed at the bottom. The limiting tooth profile 30 is movably engaged with the rotating gear 20. The top of the retaining plate 29 is sleeved on the threaded short shaft 28 and fixed by a nut. During installation, the retaining plate is sleeved on the threaded short shaft and locked on the threaded short shaft by a nut to achieve a fixed position.

[0067] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be embraced therein.

[0068] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A movable inner support device for a city integrated pipe gallery template, comprising two sets of outer templates (100), the two sets of outer templates (100) being arranged in parallel; It is characterized by: The invention also includes a support platform (1), which is installed between two groups of outer templates (100). A vertical hydraulic support rod (2) is installed in the middle of the support platform (1). A transverse hydraulic group 1 and a transverse hydraulic group 2 are symmetrically installed on both sides of the vertical hydraulic support rod (2). The output ends of the transverse hydraulic group 1 and the transverse hydraulic group 2 are both detachably connected to the inner plastic template (200); the inner plastic template (200) and the outer template (100) are arranged in parallel.

2. A movable urban integrated pipe gallery template inner support device according to claim 1, characterized in that: Synchronous component 1 is installed on the transverse hydraulic group 1, and synchronous component 2 is installed on the transverse hydraulic group 2. A mounting groove (3) is provided on the support platform (1), and the synchronous component 1 and the synchronous component 2 move synchronously in the mounting groove (3).

3. A movable inner support device for urban integrated pipe gallery template according to claim 1, characterized in that: The transverse hydraulic group 1 includes a hydraulic rod 1 (4) and a hydraulic rod 2 (5), and the output ends of the hydraulic rod 1 (4) and the hydraulic rod 2 (5) are both installed with a support plate 1 (6), and the support plate 1 (6) and the output end of the hydraulic rod 1 (4) or the hydraulic rod 2 (5) are fixedly installed with a rib plate (7); The side of the support plate 1 (6) facing away from the vertical hydraulic support rod (2) is connected to the inner plastic template (200); The hydraulic rod 1 (4) is located above the hydraulic rod 2 (5), and a wing plate (8) is fixedly installed between the hydraulic rod 1 (4) and the vertical hydraulic support rod (2).

4. A movable inner support device for urban integrated pipe gallery template according to claim 1, characterized in that: The transverse hydraulic group 2 includes a hydraulic rod 3 (9) and a hydraulic rod 4 (10), and the output ends of the hydraulic rod 3 (9) and the hydraulic rod 4 (10) are both installed with a support plate 2 (11), and the support plate 2 (11) and the output end of the hydraulic rod 3 (9) or the hydraulic rod 4 (10) are fixedly installed with a rib plate (7); The side of the second support plate (11) facing away from the vertical hydraulic support rod (2) is connected to the inner plastic template (200); The hydraulic rod three (9) is located above the hydraulic rod four (10), and a wing plate (8) is fixedly installed between the hydraulic rod three (9) and the vertical hydraulic support rod (2).

5. A movable inner support device for urban integrated pipe gallery template according to claim 1, characterized in that: A mounting seat (12) is installed at the bottom of the support platform (1), and a universal wheel (13) is installed at the bottom of the mounting seat (12).

6. A movable inner support device for urban integrated pipe gallery template according to claim 2, characterized in that: The first synchronizer comprises a threaded rod (16) and a first sliding plate (14), and the second synchronizer comprises a connecting member and a second sliding plate (15), wherein the bottom of the threaded rod (16) is detachably connected to the first sliding plate (14) or the second sliding plate (15); The sliding plate 1 (14) is provided with a connecting portion 1 (17), and the sliding plate 2 (15) is provided with a connecting portion 2 (18); the connecting portion 1 (17) and the connecting portion 2 (18) are both located in the mounting groove (3), and transverse racks (19) are provided facing each other; A rotating gear (20) is installed in the installation groove (3), and the transverse rack (19) is meshed with the rotating gear (20); The threaded rod (16) located on the sliding plate 1 (14) is suitable for correspondingly passing through the output parts of the hydraulic rod 1 (4) and the hydraulic rod 2 (5), and the threaded rod (16) located on the sliding plate 2 (15) is suitable for passing through the output parts of the hydraulic rod 3 (9) and the hydraulic rod 4 (10), and is locked on the corresponding output parts through the installation position nut (21).

7. A movable inner support device for urban integrated pipe gallery template according to claim 6, characterized in that: A bracket (22) is installed in the middle of the support platform (1), and a notch is provided on the top of the bracket (22) and is fixedly connected to the bottom of the vertical hydraulic support rod (2); An extension plate (23) is fixedly mounted on the output portion of the vertical hydraulic support rod (2), and hydraulic rod one (4) and hydraulic rod three (9) are respectively mounted on both sides of the extension plate (23); The bottom of the bracket (22) is provided with a cavity suitable for the installation groove (3) to pass through; the rotating gear (20) is located at the bottom of the bracket (22).

8. A movable inner support device for urban integrated pipe gallery template according to claim 7, characterized in that: The bottoms of the sliding plate 1 (14) and the sliding plate 2 (15) are both provided with a track groove (24), and a guide bar (25) is provided in the mounting groove (3). The guide bar (25) is adapted to the track groove (24), and the sliding plate 1 (14) and the sliding plate 2 (15) slide on the guide bar (25) accordingly.

9. A movable inner support device for urban integrated pipe gallery template according to claim 7, characterized in that: A fixed shaft (26) is installed in the axial direction of the rotating gear (20), the fixed shaft (26) is fixedly connected to the supporting platform (1), a connecting bearing (27) is installed on the fixed shaft (26), the rotating gear (20) is connected to the outer ring of the connecting bearing (27), and the fixed shaft (26) is connected to the inner ring of the connecting bearing (27); A threaded short shaft (28) is provided at the top of the fixed shaft (26), and a positioning plate (29) is installed on the threaded short shaft (28). The positioning plate (29) is a bent plate, and a limiting tooth shape (30) is installed at the bottom; the limiting tooth shape (30) is movably engaged with the rotating gear (20), and the top of the positioning plate (29) is sleeved on the threaded short shaft (28) and fixed by a nut.

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