A general platform for rubber production line

Abstract

The utility model discloses a rubber production line general platform relates to rubber production technical field, including installation platform, the installation platform upper end symmetry is equipped with mounting bracket, the installation platform bottom respectively with a plurality of telescopic link output fixed connection, the bottom plate upper end is equipped with adjusting mechanism, the bottom plate bottom is equipped with stop mechanism, the utility model discloses a mounting bracket is set up on the installation platform upper end symmetry, and mounting bracket fixed with adjusting rod fixed connection, is convenient for to different processing parts and installs, and through setting adjusting mechanism on the bottom plate upper end, and then convenient for to the installation platform work height adjusts, through setting a plurality of universal wheel on the bottom plate bottom, make convenient for to the installation platform and remove, and through setting stop mechanism, and then can fast the bottom plate and fix.

Description

Technical Field

[0001] This utility model relates to the field of rubber production technology, specifically a general platform for rubber production lines. Background Technology

[0002] In the automotive industry, rubber parts are key functional components ensuring vehicle sealing, shock absorption, noise reduction, and fluid transport; their quality directly affects the safety and comfort of the entire vehicle. In the production of long, strip-shaped products, such as fuel lines, coolant lines, and door and window seals, continuous extrusion molding using rubber extruders is commonly employed. After the molten rubber is extruded from the extruder, it must immediately undergo a series of online processing devices to become the final product. These devices typically include cooling water tanks for shaping and cooling, traction machines for providing traction, cutting machines for length trimming, and marking machines for marking. To achieve continuous production, these processing devices must be arranged sequentially and securely mounted on a unified work platform.

[0003] However, when facing the production of diverse products, the required subsequent processing equipment varies significantly in type, overall height, and dimensions. To ensure product stability and prevent deformation during transport, the core working unit of each processing device must be precisely aligned with the central axis of the extruder outlet. In existing production technologies, the work platforms used to install these devices are mostly rigid structures with fixed heights, lacking an effective overall height adjustment mechanism. This makes it difficult to quickly adjust the height of the platform's working surface to accommodate different devices when changing products or equipment, forcing companies to customize dedicated platforms for different production lines or manufacture a large number of pads. This results in numerous limitations, including poor adaptability, cumbersome adjustments, space occupation, and high production costs, severely restricting the flexibility and efficiency of the production line.

[0004] Based on this, a universal platform for rubber production lines is now provided, which can eliminate the drawbacks of existing equipment. Utility Model Content

[0005] The purpose of this invention is to provide a universal platform for rubber production lines to solve the problems in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A universal platform for a rubber production line includes an installation platform. The installation platform has symmetrically arranged mounting frames at its upper end, each mounting frame having several mounting holes. Adjusting rods are fixedly mounted at both ends of the installation platform. The mounting frames are fixedly connected to the adjusting rods by screws. Each adjusting rod has several adjusting holes on one side. The bottom end of the installation platform is fixedly connected to the output ends of several telescopic rods, all of which are fixedly mounted on the upper end of a base plate. The bottom end of the base plate has several casters. The upper end of the base plate has an adjustment mechanism for adjusting the working height of the installation platform, and the bottom end of the base plate has a stop mechanism for fixing the installation platform.

[0008] Based on the above technical solutions, this utility model also provides the following optional technical solutions:

[0009] In one alternative embodiment: the adjusting mechanism includes hinge components, and the mounting platform is symmetrically provided with hinge components at its bottom end. Each hinge component includes two symmetrically arranged first connecting rods. A first fixed hinge seat and a first sliding hinge seat are respectively hinged to both ends of each first connecting rod. The first fixed hinge seats are all fixedly mounted on the bottom end of the mounting platform, and the first sliding hinge seats are all slidably mounted on first guide rods. The first guide rods are all fixedly mounted on the upper end of the base plate. A first fixed rod is fixedly mounted on one side of each first sliding hinge seat, and the first fixed rods on the same side are all fixedly mounted on a first threaded pipe. The first threaded tube is symmetrically arranged on the bidirectional screw. A first rotating plate is rotatably provided at both ends of the bidirectional screw. A first worm gear is fixedly provided at one end of the bidirectional screw. A first worm is meshed on the first worm gear. A second rotating plate is rotatably provided on the rotating shafts at both ends of the first worm. A fixed shaft is fixedly provided at one end of the first worm. A first turntable is fixedly provided at one end of the fixed shaft. A third rotating plate is rotatably provided on the fixed shaft. The first, second, and third rotating plates are all fixedly provided on the upper end of the base plate. A locking component for limiting the position of the first turntable is provided on one side of the third rotating plate.

[0010] In one alternative embodiment: the locking assembly includes a limiting plate and a limiting ring. The limiting ring is fixedly disposed at one end inside the mounting tube, and the mounting tube is fixedly disposed on one side of the third fixing plate. A plurality of limiting grooves are arrayed on one side of the limiting ring. A limiting rod is provided on one side of the limiting plate at a position corresponding to the limiting groove. The limiting plate is fixedly disposed at one end of a push rod. The push rod is fixedly disposed on one side of a sliding plate. The sliding plate is slidably disposed inside the fixing tube. A limiting groove is provided on the outer side of the fixing tube at a position corresponding to the sliding plate. The sliding plate is fixedly disposed inside a sliding handle. The sliding handle is slidably disposed on the fixing tube. A tension spring is fixedly disposed between one side of the sliding plate and one end inside the fixing tube.

[0011] In one alternative: a first protective box is fixedly provided at the upper end of the base plate corresponding to the position of the bidirectional screw, a guide groove is provided at the position of the first protective box corresponding to the position of the first fixed rod, and a second protective box is fixedly provided at the upper end of the base plate corresponding to the position of the first worm gear.

[0012] In one alternative embodiment: the stopping mechanism includes two symmetrically arranged stopping plates, each with a second fixed hinge seat symmetrically arranged at its upper end. A second connecting rod is hinged to each of the second fixed hinge seats. Both second connecting rods are fixedly mounted on a rotating shaft. A fourth rotating plate is rotatably mounted at both ends of the rotating shaft. The fourth rotating plates are fixedly mounted at the bottom end of the base plate. A gear is fixedly mounted on each rotating shaft. A rack is meshed with each gear. The rack is slidably mounted on a limiting rod. The limiting rod is fixedly mounted at the bottom end of the base plate. The bottom end of the base plate is provided with a retraction assembly for driving the stopping plates to unfold and retract.

[0013] In one alternative embodiment: the retractable assembly includes a threaded rod, with fifth rotating plates rotatably mounted at both ends of the threaded rod, and the bottom rotating plates fixedly mounted at the bottom end of the base plate. A second threaded tube is fitted onto the threaded rod, and second fixed rods are symmetrically mounted on the second threaded tubes. A third fixed hinge seat is fixedly mounted at one end of each of the second fixed rods, and a third connecting rod is hinged to each of the third fixed hinge seats. A second sliding hinge seat is hinged to the other end of each of the third connecting rods. Two second sliding hinge seats are respectively fixedly mounted at one end of two racks. A second worm gear is fixedly mounted at one end of the threaded rod, and a second worm is meshed on the second worm gear. The second worm is rotatably mounted inside a fourth protective box, which is fixedly mounted at the bottom end of the base plate. A second turntable is fixedly mounted at one end of the second worm.

[0014] In one alternative: a third protective box is provided at the bottom end of the base plate corresponding to the position of the threaded rod, and a guide groove is provided at the third protective box corresponding to the position of the second fixed rod.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] This utility model facilitates the installation of different processing parts by symmetrically arranging mounting frames at the top of the mounting platform and fixing the mounting frames to the adjusting rod. Furthermore, the adjustment mechanism at the top of the base plate facilitates the adjustment of the working height of the mounting platform. Several casters at the bottom of the base plate facilitate the movement of the mounting platform, and the stop mechanism allows for quick fixation of the base plate, thereby increasing the practicality of the universal platform for rubber production lines. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model.

[0018] Figure 2 This is a schematic diagram of the bottom structure of the base plate of this utility model.

[0019] Figure 3 This is a schematic diagram of the internal structure of the first protective box of this utility model.

[0020] Figure 4 This is a schematic diagram of the installation of the first worm gear and the first worm of this utility model.

[0021] Figure 5 This is a schematic diagram of the internal structure of the fixed tube of this utility model.

[0022] Figure 6 This is a schematic diagram of the internal structure of the third protective box of this utility model.

[0023] Figure 7 This is a schematic diagram of the installation of the second worm gear and the second worm of this utility model.

[0024] Figure reference numerals: 11 Mounting platform, 12 Telescopic rod, 13 Base plate, 14 Mounting bracket, 15 Adjusting rod, 16 First connecting rod, 17 First sliding hinge seat, 18 First fixed rod, 19 First threaded tube, 20 Bidirectional screw, 21 First worm gear, 22 First worm, 23 First turntable, 24 Fixed tube, 25 Sliding handle, 26 Push rod, 27 Limiting plate, 28 Limiting ring, 29 Mounting tube, 30 Tension spring, 31 First protective box, 32 Second protective box, 33 Caster wheel, 34 Stop plate, 35 Second connecting rod, 36 Rotating shaft, 37 Gear, 38 Rack, 39 Limiting rod, 40 Third connecting rod, 41 Second fixed rod, 42 Second threaded tube, 43 Threaded rod, 44 Second worm gear, 45 Second worm, 46 Second turntable, 47 Third protective box. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0026] In one embodiment, such as Figures 1-7As shown, a general-purpose platform for a rubber production line includes an installation platform 11. The installation platform 11 has symmetrically arranged mounting frames 14 at its upper end, each mounting frame 14 having several mounting holes. Adjusting rods 15 are fixedly installed at both ends of the installation platform 11. The mounting frames 14 are fixedly connected to the adjusting rods 15 by screws. Several adjusting holes are provided on one side of each adjusting rod 15. The bottom end of the installation platform 11 is fixedly connected to the output ends of several telescopic rods 12. The telescopic rods 12 are all fixedly installed on the upper end of a base plate 13. Several casters 33 are provided at the bottom end of the base plate 13. An adjustment mechanism for adjusting the working height of the installation platform 11 is provided at the upper end of the base plate 13. A stop mechanism for fixing the installation platform 11 is provided at the bottom end of the base plate 13. The adjustment mechanism facilitates quick adjustment of the working height of the installation platform 11, and the stop mechanism facilitates quick fixing after the installation platform 11 has moved.

[0027] The adjustment mechanism includes a hinge component. The mounting platform 11 has symmetrically arranged hinge components at its bottom end. Each hinge component includes two symmetrically arranged first connecting rods 16. A first fixed hinge seat and a first sliding hinge seat 17 are respectively hinged at both ends of each first connecting rod 16. The first fixed hinge seats are all fixedly mounted on the bottom end of the mounting platform 11. The first sliding hinge seats 17 are all slidably mounted on first guide slide rods. The first guide slide rods are all fixedly mounted on the upper end of the base plate 13. A first fixed rod 18 is fixedly mounted on one side of each first sliding hinge seat 17. The first fixed rod 18 on the same side is fixedly mounted on a first threaded tube 19. The two first threaded tubes 19 are symmetrically arranged on a bidirectional screw 20. A first rotating plate is rotatably mounted at both ends of the bidirectional screw 20. A first worm gear 21 is fixedly mounted at one end of the bidirectional screw 20. A first worm 22 meshes with the first worm gear 21. Both ends of the first worm 22 have rotating shafts... A second rotating plate is provided for rotation. A fixed shaft is fixed at one end of the first worm gear 22, and a first turntable 23 is fixed at one end of the fixed shaft. A third rotating plate is rotatably mounted on the fixed shaft. The first, second, and third rotating plates are all fixed to the upper end of the base plate 13. A locking component for limiting the first turntable 23 is provided on one side of the third rotating plate. In use, when it is necessary to adjust the working height of the mounting platform 11, the first worm gear 22 is rotated by rotating the first turntable 23. The first worm gear 22 meshes with the first worm wheel 21 to drive the bidirectional screw 20 to rotate. The bidirectional screw 20 cooperates with the first threaded tube 19, so that the two first threaded tubes 19 move simultaneously and in opposite directions. The first threaded tube 19 drives the first sliding hinge seat 17 to move through the first fixed rod 18. The first sliding hinge seat 17 drives the mounting platform 11 to move through the first connecting rod 16, thereby adjusting the working height of the mounting platform 11.

[0028] The locking assembly includes a limiting plate 27 and a limiting ring 28. The limiting ring 28 is fixedly disposed inside one end of the mounting tube 29, which is fixedly disposed on one side of the third fixing plate. A plurality of limiting grooves are arrayed on one side of the limiting ring 28. A limiting rod is provided on one side of the limiting plate 27 at a position corresponding to the limiting groove. The limiting plate 27 is fixedly disposed at one end of the push rod 26, which is fixedly disposed on one side of the sliding plate. The sliding plate is slidably disposed inside the fixing tube 24. A limiting groove is provided on the outer side of the fixing tube 24 at a position corresponding to the sliding plate. The sliding plate is fixedly disposed inside the sliding handle 25. 5. The sliding plate is mounted on the fixed tube 24. A tension spring 30 is fixed between one side of the sliding plate and one end inside the fixed tube 24. When the first turntable 23 needs to be rotated, the sliding handle 25 is pushed to slide. The sliding handle 25 drives the push rod 26 to slide through the sliding plate. The push rod 26 drives the limiting plate 27 to move, so that the limiting rod is disengaged from a limiting groove. Then, the first turntable 23 is rotated. After the working height of the installation platform 11 is adjusted, the sliding handle 25 is released. Under the action of the tension spring 30, the limiting rod is inserted into the limiting groove, thereby fixing the first turntable 23 and preventing the first turntable 23 from rotating during operation.

[0029] A first protective box 31 is fixedly provided at the upper end of the base plate 13 corresponding to the position of the bidirectional screw 20. A guide groove is provided at the position of the first protective box 31 corresponding to the position of the first fixed rod 18. A second protective box 32 is fixedly provided at the upper end of the base plate 13 corresponding to the position of the first worm gear 21. In use, it is convenient to protect the bidirectional screw 20, the first worm gear 21 and the first worm 22.

[0030] The stopping mechanism includes two symmetrically arranged stopping plates 34. Each stopping plate 34 has a second fixed hinge seat symmetrically arranged on its upper end. Each second fixed hinge seat is hinged with a second connecting rod 35. Both second connecting rods 35 are fixedly mounted on a rotating shaft 36. Each end of the rotating shaft 36 has a fourth rotating plate rotatably mounted on it. Each fourth rotating plate is fixedly mounted on the bottom end of the base plate 13. Each rotating shaft 36 has a gear 37 fixedly mounted on it. Each gear 37 has a rack 38 meshing with it. Each rack 38 is slidably mounted on a limiting rod 39. The limiting rod 39 is fixedly mounted on the bottom end of the base plate 13. The bottom end of the base plate 13 has a retraction assembly for driving the stopping plates 34 to unfold and retract.

[0031] The retractable assembly includes a threaded rod 43, with fifth rotating plates rotatably mounted at both ends of the threaded rod 43. The bottom rotating plates are fixedly mounted on the bottom end of the base plate 13. A second threaded tube 42 is fitted onto the threaded rod 43, and second fixed rods 41 are symmetrically mounted on the second threaded tube 42. A third fixed hinge seat is fixedly mounted on one end of each of the second fixed rods 41, and a third connecting rod 40 is hinged to each of the third fixed hinge seats. A second sliding hinge seat is hinged to the other end of each of the third connecting rods 40. Two second sliding hinge seats are respectively fixedly mounted on one end of two racks 38. A second worm gear 44 is fixedly mounted on one end of the threaded rod 43, and a second worm 45 meshes with the second worm gear 44. The second worm 45 is rotatably mounted on the fourth... Inside the protective box, the fourth protective box is fixedly installed at the bottom end of the base plate 13. A second turntable 46 is fixedly installed at one end of the second worm gear 45. When it is necessary to fix the base plate 13, the second turntable 46 is rotated. The second turntable 46 drives the second worm gear 45 to rotate. The second worm gear 45 meshes with the second worm wheel 44 to drive the threaded rod 43 to rotate. The threaded rod 43 cooperates with the second threaded tube 42 to drive the two third connecting rods 40 to move. The two third connecting rods 40 respectively drive the rack 38 to slide, and the two racks 38 move in opposite directions. The rack 38 meshes with the gear 37 to drive the rotating shaft 36 to rotate. The rotating shaft 36 drives the stop plate 34 to rotate through the second connecting rod 35, so that the stop plate 34 is in close contact with the ground, thereby quickly fixing the base plate 13.

[0032] A third protective box 47 is provided at the bottom end of the base plate 13 corresponding to the position of the threaded rod 43. A guide groove is provided at the position of the third protective box 47 corresponding to the position of the second fixed rod 41, so as to facilitate the protection of the threaded rod 43 during use.

[0033] The above embodiment discloses a general platform for a rubber production line. When the working height of the mounting platform 11 needs to be adjusted, the sliding handle 25 is pushed to slide. The sliding handle 25 drives the push rod 26 to slide through the sliding plate. The push rod 26 drives the limiting plate 27 to move, so that the limiting rod disengages from a limiting groove. Then, the first turntable 23 is rotated, and the first turntable 23 drives the first worm gear 22 to rotate. The first worm gear 22 meshes with the first worm wheel 21 to drive the bidirectional screw 20 to rotate. The bidirectional screw 20 cooperates with the first threaded tube 19, so that the two first threaded tubes 19 move simultaneously and in opposite directions. The first threaded tube 19 drives the first sliding hinge seat 17 to move through the first fixed rod 18. The first sliding hinge seat 17 drives the mounting platform 11 to move through the first connecting rod 16, thereby adjusting the working height of the mounting platform 11. After the working height of the mounting platform 11 is adjusted, the sliding handle 25 is released. Under the action of the tension spring 30, the limiting rod is inserted into the limiting groove, thereby fixing the first turntable 23.

[0034] When the installation platform 11 needs to be moved, it is moved using the casters 33. When the installation platform 11 needs to be put into operation, the second turntable 46 is rotated, which drives the second worm gear 45 to rotate. The second worm gear 45 meshes with the second worm wheel 44, which drives the threaded rod 43 to rotate. The threaded rod 43 cooperates with the second threaded tube 42 to drive the two third connecting rods 40 to move. The two third connecting rods 40 drive the rack 38 to slide, and the two racks 38 move in opposite directions. The rack 38 meshes with the gear 37, which drives the rotating shaft 36 to rotate. The rotating shaft 36 drives the stop plate 34 to rotate through the second connecting rod 35, so that the stop plate 34 is in close contact with the ground, thereby quickly fixing the base plate 13.

[0035] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A universal platform for a rubber production line, comprising an installation platform (11), wherein the installation platform (11) is symmetrically provided with mounting frames (14) at its upper end, the mounting frames (14) are provided with a plurality of mounting holes at their upper ends, and adjusting rods (15) are fixedly provided at both ends of the installation platform (11), the mounting frames (14) being fixedly connected to the adjusting rods (15) by screws, and the adjusting rods (15) having a plurality of adjusting holes on one side, characterized in that, The bottom end of the installation platform (11) is fixedly connected to the output ends of several telescopic rods (12). The telescopic rods (12) are all fixedly mounted on the upper end of the base plate (13). The bottom end of the base plate (13) is provided with several universal wheels (33). The upper end of the base plate (13) is provided with an adjustment mechanism for adjusting the working height of the installation platform (11). The bottom end of the base plate (13) is provided with a stop mechanism for fixing the installation platform (11).

2. The universal platform for a rubber production line according to claim 1, characterized in that, The adjustment mechanism includes a hinge component. The mounting platform (11) is symmetrically provided with the hinge component at its bottom end. The hinge component includes two symmetrically arranged first connecting rods (16). The two ends of the first connecting rods (16) are respectively hinged with a first fixed hinge seat and a first sliding hinge seat (17). The first fixed hinge seats are all fixedly provided at the bottom end of the mounting platform (11). The first sliding hinge seats (17) are all slidably provided on the first guide slide rod. The first guide slide rod is all fixedly provided at the upper end of the base plate (13). A first fixed rod (18) is fixedly provided on one side of each of the first sliding hinge seats (17). The first fixed rods (18) on the same side are all fixedly provided on a first threaded tube (19). The two first threaded tubes (19) Symmetrically arranged on a bidirectional screw (20), with a first rotating plate rotatably provided at both ends of the bidirectional screw (20), a first worm wheel (21) fixedly provided at one end of the bidirectional screw (20), a first worm (22) meshing on the first worm wheel (21), a second rotating plate rotatably provided on the rotating shafts at both ends of the first worm (22), a fixed shaft fixedly provided at one end of the first worm (22), a first turntable (23) fixedly provided at one end of the fixed shaft, a third rotating plate rotatably provided on the fixed shaft, the first rotating plate, the second rotating plate and the third rotating plate are all fixedly provided on the upper end of the base plate (13), and a locking component for limiting the first turntable (23) is provided on one side of the third rotating plate.

3. The universal platform for a rubber production line according to claim 2, characterized in that, The locking assembly includes a limiting plate (27) and a limiting ring (28). The limiting ring (28) is fixedly disposed inside one end of the mounting tube (29). The mounting tube (29) is fixedly disposed on one side of the third fixing plate. A plurality of limiting grooves are arranged in an array on one side of the limiting ring (28). A limiting rod is provided on one side of the limiting plate (27) at a position corresponding to the limiting groove. The limiting plate (27) is fixedly disposed at one end of the push rod (26). The push rod (26) is fixedly disposed on one side of the sliding plate. The sliding plate is slidably disposed inside the fixing tube (24). A limiting groove is provided on the outside of the fixing tube (24) at a position corresponding to the sliding plate. The sliding plate is fixedly disposed inside the sliding handle (25). The sliding handle (25) is slidably disposed on the fixing tube (24). A tension spring (30) is fixedly disposed between one side of the sliding plate and one end inside the fixing tube (24).

4. The universal platform for a rubber production line according to claim 3, characterized in that, A first protective box (31) is fixedly provided at the upper end of the base plate (13) corresponding to the position of the bidirectional screw (20). A guide groove is provided at the position of the first protective box (31) corresponding to the position of the first fixed rod (18). A second protective box (32) is fixedly provided at the upper end of the base plate (13) corresponding to the position of the first worm gear (21).

5. The universal platform for a rubber production line according to claim 1, characterized in that, The stopping mechanism includes two symmetrically arranged stopping plates (34). Each stopping plate (34) has a second fixed hinge seat symmetrically arranged on its upper end. Each second fixed hinge seat is hinged with a second connecting rod (35). Both second connecting rods (35) are fixed on a rotating shaft (36). Each end of the rotating shaft (36) is rotatably provided with a fourth rotating plate. Each fourth rotating plate is fixed on the bottom end of the base plate (13). Each rotating shaft (36) is fixed with a gear (37). Each gear (37) is meshed with a rack (38). Each rack (38) is slidably arranged on a limiting rod (39). The limiting rod (39) is fixed on the bottom end of the base plate (13). The bottom end of the base plate (13) is provided with a retraction assembly for driving the stopping plate (34) to unfold and retract.

6. The universal platform for a rubber production line according to claim 5, characterized in that, The retractable assembly includes a threaded rod (43), with a fifth rotating plate rotatably mounted at both ends of the threaded rod (43). The bottom rotating plate is fixedly mounted at the bottom end of the base plate (13). A second threaded tube (42) is fitted onto the threaded rod (43). A second fixed rod (41) is symmetrically mounted on the second threaded tube (42). A third fixed hinge seat is fixedly mounted at one end of each of the second fixed rods (41). A third connecting rod (40) is hinged to each of the third fixed hinge seats. A second sliding hinge seat is hinged to the other end of each of the third connecting rods (40). Two second sliding hinge seats are respectively fixedly mounted at one end of two racks (38). A second worm gear (44) is fixedly mounted at one end of the threaded rod (43). A second worm (45) meshes with the second worm gear (44). The second worm (45) is rotatably mounted inside a fourth protective box. The fourth protective box is fixedly mounted at the bottom end of the base plate (13). A second turntable (46) is fixedly mounted at one end of the second worm (45).

7. A universal platform for a rubber production line according to claim 6, characterized in that, The bottom end of the base plate (13) is provided with a third protective box (47) at the position corresponding to the threaded rod (43), and the third protective box (47) is provided with a guide groove at the position corresponding to the second fixed rod (41).

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