A single-sided aluminum alloy formwork reinforcing system for a side wall of a building

Abstract

This application relates to a single-sided aluminum alloy formwork reinforcement system for building side walls, belonging to the field of aluminum alloy formwork technology. It includes multiple aluminum formwork panels, each comprising a panel and fixing strips fixedly disposed along the edge of the panel. The fixing strips have several connecting holes. Multiple connecting pins for inserting into the connecting holes are disposed on the panel along the length of the fixing strips. A drive rod is slidably disposed on the panel along its length, and a drive platform is disposed on the drive rod. The drive platform has an inclined surface for abutting against the connecting pins. A drive assembly is disposed on the panel for driving the drive rod to move up and down. The drive assembly drives the drive rod to move, and the inclined surface of the drive platform pushes the connecting pins to move, causing the connecting pins to insert into the connecting holes of two adjacent fixing strips, thus connecting two adjacent aluminum formwork panels. This allows multiple aluminum formwork panels to share the pressure during concrete pouring, improving the construction efficiency of the aluminum alloy formwork.

Description

Technical Field

[0001] This application relates to the field of aluminum alloy formwork technology, and in particular to a single-sided aluminum alloy formwork reinforcement system for building side walls. Background Technology

[0002] Aluminum formwork is commonly used in the construction of side wall structures of existing buildings. Aluminum alloy formwork, also known as concrete engineering aluminum alloy formwork, is a new generation of formwork systems following plywood formwork, combined steel formwork systems, steel-framed wood (bamboo) plywood systems, large formwork systems, and early stripping formwork systems.

[0003] To facilitate transportation, since the size of a single aluminum alloy formwork is limited, the formwork system after the entire building side wall is installed usually requires multiple side-by-side formwork pieces to be assembled together, and then adjacent formwork pieces are connected and fixed by several bolts.

[0004] However, in actual construction, a large number of bolts need to be installed, making the overall installation inconvenient and time-consuming, resulting in low efficiency. Summary of the Invention

[0005] To improve the construction efficiency of aluminum alloy formwork, this application provides a single-sided aluminum alloy formwork reinforcement system for building side walls.

[0006] This application provides a single-sided aluminum alloy formwork reinforcement system for building side walls, which adopts the following technical solution:

[0007] A single-sided aluminum alloy formwork reinforcement system for building sidewalls includes multiple aluminum formwork panels. Each aluminum formwork panel includes a plate and a fixing strip fixedly disposed on the edge of the plate. The fixing strip has several connecting holes. The plate has several connecting pins for inserting into the connecting holes along the length direction of the fixing strip. The connecting pins are slidably disposed on the plate along the length direction perpendicular to the length direction of the fixing strip. A drive rod is slidably disposed on the plate along the length direction of the plate. The drive rod has a drive platform, and the drive platform has an inclined surface for abutting against the connecting pins. The plate has a drive assembly for driving the drive rod to move up and down.

[0008] By adopting the above technical solution, during construction, after aligning the aluminum formwork side by side, the drive component drives the drive rod to move, and the inclined surface of the drive platform pushes the connecting pin to move, so that the connecting pin is inserted into the connecting hole of the two adjacent fixing strips, thereby achieving the purpose of connecting the two adjacent aluminum formworks. This allows multiple aluminum formworks to jointly bear the pressure when pouring concrete, improving the construction efficiency of aluminum alloy formwork.

[0009] Optionally, a guide plate is fixedly provided on the plate body, the connecting pin is slidably inserted in the guide plate, and the connecting pin is provided with a first elastic element for driving the connecting pin to move towards the drive table.

[0010] By adopting the above technical solution, when disassembly is required, the drive rod is moved to make the drive table move away from the fixed strip. The first elastic element drives the connecting pin to disengage from the connecting hole on the fixed strip. At this time, the aluminum template can be directly removed. The operation is simple and convenient.

[0011] Optionally, the connecting pin has a mounting groove along its radial direction, and a limiting block is slidably disposed in the mounting groove to abut against the fixing strip to prevent the connecting pin from disengaging from the fixing strip. The side wall of the limiting block away from the drive table is provided with an arc-shaped guide surface. A second elastic element is provided in the mounting groove to drive the limiting block to move outward. The drive rod and the connecting pin are provided with a pulling component to pull the limiting block into the mounting groove.

[0012] By adopting the above technical solution, when connecting two adjacent aluminum templates, the drive table pushes the connecting pin into the connecting hole, the guide surface of the limiting block abuts against the fixing strip, and gradually squeezes the limiting block. The limiting block is completely squeezed into the mounting groove. After the connecting pin passes through the connecting hole, the limiting block automatically pops out under the action of the second elastic element, so that the limiting block abuts against the fixing strip, thereby constraining the aluminum template along the axial direction of the connecting pin and ensuring the stability of the entire aluminum template.

[0013] Optionally, the pulling assembly includes a pull rope and a winding wheel. The winding wheel is rotatably disposed within the drive rod. The pull rope slides through the drive rod and the connecting pin. A first through-slot is formed in the connecting pin along its axial direction. The first through-slot communicates with the mounting slot. A first opening communicating with the first through-slot is formed on the side wall of the connecting pin near the drive platform. A second through-slot is formed in the drive rod along its length. A second opening communicating with the second through-slot is formed on the side wall of the drive platform. One end of the pull rope is fixedly connected to the bottom wall of the limiting block, and the other end passes through the first opening and the second opening in sequence to be wound around the winding wheel.

[0014] By adopting the above technical solution, when it is necessary to disassemble the aluminum template, the winding wheel is rotated to drive the pull rope to move. The pull rope drives the limit block to move into the installation groove, and the connecting pin can be disengaged from the connecting hole. The operation is simple and convenient.

[0015] Optionally, the connecting pin is provided with an abutment for abutting against a fixing strip near the drive table.

[0016] By adopting the above technical solution, the abutting part abuts against the fixing strip, which prevents the fixing strip from moving away from the adjacent fixing strip. The abutting part cooperates with the limiting block to lock the two adjacent aluminum templates. At the same time, during installation, when the abutting part abuts against the fixing strip, the driving rod is difficult to push further. At this time, the driving rod can be stopped, and the limiting block pops out and abuts against the fixing strip, which is convenient to operate.

[0017] Optionally, the abutment includes a fixed platform and an elastic gasket. The fixed platform is fixedly mounted on the connecting pin, and the elastic gasket is slidably sleeved on the connecting pin for abutting against the side wall of the fixed strip near the drive platform.

[0018] By adopting the above technical solution, if the width of the two fixing strips is large during installation, the elastic gasket will be squeezed to meet the needs of fixing strips of different thicknesses, thereby increasing applicability.

[0019] Optionally, a limiting plate is fixedly provided on the side wall of the drive rod. The side wall of the limiting plate away from the drive rod has a plurality of limiting grooves along the circumference of the drive plate. A rotating shaft is rotatably inserted inside the limiting plate. One end of the rotating shaft is inserted into the drive rod and fixedly connected to the winding wheel. A handheld platform is fixedly provided at the end of the rotating shaft extending out of the drive rod. An insert block is slidably inserted into the handheld platform along the axial direction of the rotating shaft. The insert block is used to insert into the limiting groove to limit the rotation of the rotating shaft.

[0020] By adopting the above technical solution, after the insert block is inserted into the limiting groove, the handheld platform is fixed in position. At this time, the winding wheel stops rotating and the limiting block is stable. When it is necessary to disassemble the aluminum template, first pull out the insert block to make it disengage from the limiting groove, then rotate the handheld platform to drive the winding wheel and the pull rope to move, thereby driving the limiting block to move into the installation groove so that the connecting pin can disengage from the connecting hole. The operation is simple and convenient.

[0021] Optionally, the distance from the side wall of the drive platform to the fixed bar gradually decreases from top to bottom. The drive assembly includes a rack, a gear, and a handle. The rack is fixedly mounted on the drive rod, the gear is rotatably mounted on the plate, the handle is fixedly mounted on the gear, and the gear meshes with the rack.

[0022] By adopting the above technical solution, turning the handle causes the gear to rotate, which in turn drives the rack to move, thereby achieving the purpose of driving the drive rod to move up and down. The operation is simple and convenient.

[0023] Optionally, the reinforcement system further includes a side template, which is perpendicular to the aluminum template, and a leak-stopping component is provided between the side template and the aluminum template.

[0024] By adopting the above technical solution, there is a gap between the side panel and the aluminum formwork, which is prone to leakage when pouring concrete. The leak-stopping component can seal the gap and increase the structural strength of the adjacent aluminum formwork and side formwork, reduce deformation, and effectively prevent leakage.

[0025] Optionally, the leak-sealing component includes a first leak-sealing plate for abutting against the side template and a second leak-sealing plate for abutting against the fixing strip. The side wall of the second leak-sealing plate near the side template is flush with the first leak-sealing plate. A compensation plate for abutting against the fixing strip is hinged to the first leak-sealing plate. When the compensation plate is rotated to be perpendicular to the first compensation plate, the side wall of the compensation plate is flush with the second leak-sealing plate.

[0026] By adopting the above technical solution, if the width of the side wall is slightly larger than the width of the aluminum formwork, the compensation plate is rotated to be perpendicular to the first leak-stopping plate so that the compensation plate is flush with the aluminum formwork, thereby increasing its applicability.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] 1. During construction, after aligning the aluminum formwork side by side, the drive assembly drives the drive rod to move, and the inclined surface of the drive platform pushes the connecting pin to move so that the connecting pin is inserted into the connecting hole of the two adjacent fixing strips, thereby connecting the two adjacent aluminum formworks. This allows multiple aluminum formworks to share the pressure when pouring concrete, improving the construction efficiency of aluminum alloy formwork.

[0029] 2. When connecting two adjacent aluminum templates, the drive table pushes the connecting pin into the connecting hole. The guide surface of the limiting block abuts against the fixing strip, gradually squeezing the limiting block. The limiting block is completely squeezed into the mounting groove. After the connecting pin passes through the connecting hole, the limiting block automatically pops out under the action of the second elastic element, so that the limiting block abuts against the fixing strip, which constrains the aluminum template along the axial direction of the connecting pin and ensures the stability of the entire aluminum template.

[0030] 3. The abutting part abuts against the fixing strip, preventing the fixing strip from moving away from the adjacent fixing strip. The abutting part cooperates with the limiting block to lock the two adjacent aluminum templates. At the same time, during installation, when the abutting part abuts against the fixing strip, the drive rod is difficult to push further. At this time, the drive rod can be stopped, and the limiting block pops out and abuts against the fixing strip, making the operation convenient. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application;

[0032] Figure 2 This is a schematic diagram illustrating the structure of the leak-stopping component, which is the main feature of this application.

[0033] Figure 3 This is a schematic diagram illustrating the main structure of the driving component in the embodiments of this application;

[0034] Figure 4 This is a cross-sectional view of the connecting pin in an embodiment of this application;

[0035] Figure 5 This is an exploded view of a portion of the structure of an embodiment of this application.

[0036] Explanation of reference numerals in the attached drawings: 1. Side template; 2. Aluminum template; 21. Plate body; 211. Guide plate; 22. Fixing strip; 221. Connecting hole; 3. Leak-stopping component; 31. First leak-stopping plate; 32. Second leak-stopping plate; 33. Compensating plate; 331. Bolt; 332. Ear plate; 4. Connecting pin; 41. Abutment platform; 42. Compression spring; 43. Mounting groove; 431. Limiting block; 4311. Guide surface; 432. Spring; 44. First through groove; 451. Fixing platform; 452. Elastic washer; 5. Drive rod; 51. Drive platform; 511. Inclined surface; 52. Second through groove; 6. Drive assembly; 61. Rack; 62. Gear; 63. Handle; 71. Pull rope; 72. Winding wheel; 81. Limiting disc; 811. Limiting groove; 82. Rotating shaft; 83. Handheld platform; 831. Insert block. Detailed Implementation

[0037] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0038] This application discloses an easy-to-install top-hung window structure.

[0039] Reference Figure 1 A single-sided aluminum alloy formwork reinforcement system for building side walls is disclosed. The reinforcement system includes multiple aluminum formwork panels 2 and side formwork panels 1. The side formwork panels 1 and aluminum formwork panels 2 are perpendicular to each other, and the connection point between the side formwork panels 1 and aluminum formwork panels 2 is the external corner of the side wall. The aluminum formwork panel 2 includes a plate body 21 and a fixing strip 22 fixedly installed on the edge of the plate body 21. The fixing strip 22 is integrally formed with the plate body 21, perpendicular to the plate body 21, and has a plurality of connecting holes 221.

[0040] Reference Figure 1 and Figure 2 The side template 1 and the aluminum template 2 are set perpendicularly. A leak-stopping component 3 is set between the side template 1 and the aluminum template 2. The leak-stopping component 3 includes a first leak-stopping plate 31 for abutting against the side template 1 and a second leak-stopping plate 32 for abutting against the fixing strip 22. The side wall of the second leak-stopping plate 32 near the side template 1 is flush with the first leak-stopping plate 31. A compensation plate 33 for abutting against the fixing strip 22 is hinged on the first leak-stopping plate 31. When the compensation plate 33 is rotated to be perpendicular to the first compensation plate 33, the side wall of the compensation plate 33 is flush with the second leak-stopping plate 32.

[0041] Reference Figure 2 A bolt 331 is threaded through the fixing strip 22, and an ear plate 332 is fixedly installed on the compensation plate 33. The side wall of the ear plate 332 is provided with a threaded hole. When the compensation plate 33 is rotated to be flush with the aluminum template 2, the bolt 331 is screwed into the threaded hole to fix the compensation plate 33.

[0042] There is often an installation gap between the side panel and the aluminum formwork 2, which can easily lead to grout leakage when pouring concrete. The leak-stopping component 3 can seal the gap and increase the structural strength of the adjacent part of the aluminum formwork 2 and the side formwork 1, reduce deformation, and effectively prevent leakage.

[0043] Reference Figure 1 and Figure 3 Multiple connecting pins 4 for inserting into connecting holes 221 are provided on the plate 21 along the length direction of the fixing strip 22. A guide plate 211 is fixedly provided on the plate 21, and the connecting pins 4 slide through the guide plate 211. The size of the connecting pins 4 is adapted to the connecting holes 221.

[0044] Reference Figure 4 The connecting pin 4 is provided with a first elastic element for driving the connecting pin 4 to move towards the drive table 51. The connecting pin 4 is fixedly provided with an abutment table 41, which is located on the connecting pin 4 between the guide plate 211 and the drive rod 5. The first elastic element is a compression spring 42 sleeved on the connecting pin 4. One end of the compression spring 42 abuts against the guide plate 211, and the other end abuts against the abutment table 41.

[0045] Reference Figure 1 and Figure 4 A drive rod 5 is slidably arranged on the plate 21 along the length direction of the plate 21. A drive platform 51 is provided on the drive rod 5. An inclined surface 511 for abutting against the connecting pin 4 is provided on the drive platform 51. The distance from the side wall of the drive platform 51 to the fixing strip 22 gradually decreases from top to bottom.

[0046] Reference Figure 3 The plate 21 is provided with a drive assembly 6 for driving the drive rod 5 to move up and down. The drive assembly 6 includes a rack 61, a gear 62 and a handle 63. The rack 61 is fixedly mounted on the drive rod 5, the gear 62 is rotatably mounted on the plate 21, and the handle 63 is fixedly mounted on the gear 62. The gear 62 meshes with the rack 61.

[0047] Reference Figure 4A mounting groove 43 is provided radially on the connecting pin 4. A limiting block 431 is slidably disposed in the mounting groove 43 to abut against the fixing strip 22 to prevent the connecting pin 4 from disengaging from the fixing strip 22. An arc-shaped guide surface 4311 is provided on the side wall of the limiting block 431 away from the drive table 51. When the limiting block 431 extends out of the mounting groove 43, a portion of the guide surface 4311 is located within the mounting groove 43. A second elastic element is provided in the mounting groove 43 to drive the limiting block 431 to move outward. The second elastic element is a spring 432. One end of the spring 432 is fixedly connected to the bottom wall of the mounting groove 43, and the other end is fixedly connected to the bottom wall of the limiting block 431.

[0048] Reference Figure 4 and Figure 5 The drive rod 5 and the connecting pin 4 are provided with a pulling assembly for pulling the limiting block 431 into the mounting groove 43. The pulling assembly includes a pull rope 71 and a winding wheel 72. The winding wheel 72 is rotatably disposed in the drive rod 5. The pull rope 71 slides through the drive rod 5 and the connecting pin 4. The connecting pin 4 has a first through groove 44 along its axial direction, which communicates with the mounting groove 43. The side wall of the connecting pin 4 near the drive platform 51 has a first opening that communicates with the first through groove 44. The drive rod 5 has a second through groove 52 along its length, and the side wall of the drive platform 51 has a second opening that communicates with the second through groove 52. One end of the pull rope 71 is fixedly connected to the bottom wall of the limiting block 431, and the other end passes through the first opening and the second opening in sequence to be wound around the winding wheel 72.

[0049] When connecting two adjacent aluminum templates 2, the drive table 51 pushes the connecting pin 4 into the connecting hole 221. The guide surface 4311 of the limiting block 431 abuts against the fixing strip 22, gradually squeezing the limiting block 431. The limiting block 431 is completely squeezed into the mounting groove 43. After the connecting pin 4 passes through the connecting hole 221, the limiting block 431 automatically pops out under the action of the second elastic element, so that the limiting block 431 abuts against the fixing strip 22, thereby constraining the aluminum template 2 along the axial direction of the connecting pin 4 and ensuring the stability of the entire aluminum template 2.

[0050] Reference Figure 4 The connecting pin 4 is provided with an abutment for abutting against the fixing strip 22 near the drive platform 51. The abutment includes a fixing platform 451 and an elastic gasket 452. The elastic gasket 452 can be a rubber pad. The fixing platform 451 is fixedly mounted on the connecting pin 4, and the elastic gasket 452 is slidably sleeved on the connecting pin 4 to abut against the side wall of the fixing strip 22 near the drive platform 51. The distance from the fixing platform 451 to the guide plate 211 is greater than the distance from the limiting block 431 to the elastic gasket 452, and the distance from the elastic gasket 452 to the limiting block 431 is not less than the sum of the thicknesses of the two fixing strips 22.

[0051] Reference Figure 5 A limiting disk 81 is fixedly provided on the side wall of the drive rod 5. The side wall of the limiting disk 81 away from the drive rod 5 has a plurality of limiting grooves 811 along the circumference of the drive disk. A rotating shaft 82 is rotatably inserted inside the limiting disk 81. One end of the rotating shaft 82 is inserted inside the drive rod 5 and fixedly connected to the winding wheel 72. A handheld platform 83 is fixedly provided at the end of the rotating shaft 82 that extends out of the drive rod 5. An insert 831 is slidably inserted inside the handheld platform 83 along the axial direction of the rotating shaft 82. The insert 831 is provided with a tip for inserting into the limiting groove 811. The insert 831 is used to insert into the limiting groove 811 to limit the rotation of the rotating shaft 82.

[0052] The implementation principle of this application embodiment is as follows: During construction, after aligning the aluminum templates 2 side by side, rotate the handle 63. The handle 63 drives the gear 62 to rotate, the gear 62 drives the rack 61 to move, and then drives the drive rod 5 to move upward. The inclined surface 511 of the drive platform 51 pushes the connecting pin 4 to move, so that the connecting pin 4 is inserted into the connecting hole 221 of the two adjacent fixing strips 22, thereby achieving the purpose of connecting the two adjacent aluminum templates 2. This allows multiple aluminum templates 2 to jointly bear the pressure when pouring concrete, thus improving the construction efficiency of aluminum alloy templates.

[0053] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A single-sided aluminum alloy formwork reinforcement system for building side walls, the reinforcement system comprising multiple aluminum formwork panels (2), each aluminum formwork panel (2) comprising a plate (21) and a fixing strip (22) fixedly disposed on the edge of the plate (21), the fixing strip (22) having a plurality of connecting holes (221), characterized in that: The plate (21) is provided with a plurality of connecting pins (4) for inserting into connecting holes (221) along the length direction of the fixing strip (22). The connecting pins (4) are slidably disposed on the plate (21) along the length direction perpendicular to the fixing strip (22). A drive rod (5) is slidably disposed on the plate (21) along the length direction of the plate (21). A drive platform (51) is provided on the drive rod (5). An inclined surface (511) for abutting against the connecting pins (4) is provided on the drive platform (51). A drive assembly (6) for driving the drive rod (5) to move up and down is provided on the plate (21). The reinforcement system also includes a side template (1). The side template (1) is set perpendicularly to the aluminum template (2), and a leak-stopping component (3) is provided between the side template (1) and the aluminum template (2). The leak-stopping component (3) includes a first leak-stopping plate (31) for abutting against the side template (1) and a second leak-stopping plate (32) for abutting against the fixing strip (22). The side wall of the second leak-stopping plate (32) near the side template (1) is flush with the first leak-stopping plate (31). A compensation plate (33) for abutting against the fixing strip (22) is hinged on the first leak-stopping plate (31). When the compensation plate (33) is rotated to be perpendicular to the first leak-stopping plate (31), the side wall of the compensation plate (33) is flush with the second leak-stopping plate (32).

2. The single-sided aluminum alloy formwork reinforcement system for building side walls according to claim 1, characterized in that: A guide plate (211) is fixedly provided on the plate (21), and the connecting pin (4) is slidably inserted in the guide plate (211). A first elastic element is provided on the connecting pin (4) to drive the connecting pin (4) to move towards the drive table (51).

3. The single-sided aluminum alloy formwork reinforcement system for building side walls according to claim 2, characterized in that: The connecting pin (4) has a mounting groove (43) along its radial direction. A limiting block (431) is slidably disposed in the mounting groove (43) to abut against the fixing strip (22) to prevent the connecting pin (4) from disengaging from the fixing strip (22). An arc-shaped guide surface (4311) is provided on the side wall of the limiting block (431) away from the drive table (51). A second elastic element is provided in the mounting groove (43) to drive the limiting block (431) to move outward. Pulling components are provided on the drive rod (5) and the connecting pin (4) to pull the limiting block (431) into the mounting groove (43).

4. The single-sided aluminum alloy formwork reinforcement system for building side walls according to claim 3, characterized in that: The pulling assembly includes a pull rope (71) and a winding wheel (72). The winding wheel (72) is rotatably disposed inside the drive rod (5). The pull rope (71) slides through the drive rod (5) and the connecting pin (4). A first through groove (44) is provided in the connecting pin (4) along the axial direction of the connecting pin (4). The first through groove (44) communicates with the mounting groove (43). A first opening is provided on the side wall of the connecting pin (4) near the drive platform (51) and communicates with the first through groove (44). A second through groove (52) is provided in the drive rod (5) along the length direction of the drive rod (5). A second opening is provided on the side wall of the drive platform (51) and communicates with the second through groove (52). One end of the pull rope (71) is fixedly connected to the bottom wall of the limiting block (431), and the other end passes through the first opening and the second opening in sequence to be wound on the winding wheel (72).

5. A single-sided aluminum alloy formwork reinforcement system for building side walls according to claim 4, characterized in that: The connecting pin (4) is provided with an abutment for abutting against the fixing strip (22) near the drive table (51).

6. A single-sided aluminum alloy formwork reinforcement system for building side walls according to claim 5, characterized in that: The abutment includes a fixed platform (451) and an elastic gasket (452). The fixed platform (451) is fixedly mounted on the connecting pin (4), and the elastic gasket (452) is slidably mounted on the connecting pin (4) for abutting against the side wall of the fixed strip (22) near the drive platform (51).

7. A single-sided aluminum alloy formwork reinforcement system for building side walls according to claim 4, characterized in that: A limiting plate (81) is fixedly provided on the side wall of the drive rod (5). A plurality of limiting grooves (811) are provided on the side wall of the limiting plate (81) away from the drive rod (5) along the circumference of the limiting plate (81). A rotating shaft (82) is rotatably passed through the limiting plate (81). One end of the rotating shaft (82) is passed through the drive rod (5) and fixedly connected to the winding wheel (72). A handheld platform (83) is fixedly provided on one end of the rotating shaft (82) extending out of the drive rod (5). An insert (831) is slidably passed through the handheld platform (83) along the axial direction of the rotating shaft (82). The insert (831) is used to be inserted into the limiting groove (811) to limit the rotation of the rotating shaft (82).

8. The single-sided aluminum alloy formwork reinforcement system for building side walls according to claim 1, characterized in that: The distance from the side wall of the drive platform (51) to the fixed bar (22) gradually decreases from top to bottom. The drive assembly (6) includes a rack (61), a gear (62) and a handle (63). The rack (61) is fixedly mounted on the drive rod (5). The gear (62) is rotatably mounted on the plate (21). The handle (63) is fixedly mounted on the gear (62). The gear (62) meshes with the rack (61).

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