Intelligent building integrated construction platform

Abstract

The invention relates to the technical field of construction platforms, in particular to an intelligent building integrated construction platform which comprises a plurality of steel structure stand columns, the steel structure stand columns are vertically and upwards fixed to an outer wall of a building, and a truss is fixed to the top ends of the steel structure stand columns and located above the building. A plurality of electric hoists are fixed to the truss, an upper-layer construction platform and a lower-layer construction platform are jointly installed on part of the sliding rails, the upper-layer construction platform and the lower-layer construction platform are connected to the two electric hoists through cables respectively, and when the cables are wound and unwound by the electric hoists, the upper-layer construction platform and the lower-layer construction platform are connected to the two electric hoists. The rotating plate can be automatically opened and closed under the control of the intelligent control mechanism, when the rotating plate closes the notch, a human body is prevented from falling, when the rotating plate is opened from the notch, an avoiding space is provided for the lifting action of the freight elevator and the feeding seat, and the structure is reasonable.

Description

Technical Field

[0001] The present invention relates to the technical field of construction platforms, and in particular to an intelligent integrated construction platform. Background Art

[0002] In the construction of high-rise buildings, in order to accelerate the deep integration of the construction industry with advanced manufacturing technology and realize the new generation of information technology, traditional cantilever scaffolding, attached scaffolding, and electric hanging baskets are no longer suitable for development needs. During the construction process, due to the unstable structure, high-fall accidents are very likely to occur. The scaffolding erection and dismantling efficiency is low, the labor input is large, the erection and dismantling takes a long time, the interval time between the frame dismantling and the hanging basket installation process is long, and the working conditions are poor. Summary of the invention

[0003] In order to solve the above problems, the present invention provides the following technical solutions:

[0004] An intelligent construction integrated construction platform comprises a plurality of steel structure columns, which are vertically fixed upward on the outer wall of the building, the outer surfaces of the steel structure columns are fixed with slide rails, the tops of the steel structure columns are fixed with trusses, the trusses are located above the building, a plurality of electric hoists are fixed on the trusses, and an upper construction platform and a lower construction platform are installed on some of the slide rails. The upper construction platform and the lower construction platform are respectively connected to two electric hoists through cables. When the electric hoist retracts and releases the cable, it takes the upper construction platform with it. The platform and the lower construction platform are raised and lowered, some slide rails are also provided with a charging seat, and some slide rails are also provided with a freight elevator, the charging seat and the freight elevator are connected to some of the electric hoists through cables, and the charging seat can pass through the upper construction platform and the lower construction platform in sequence when it is raised and lowered, so as to add materials to the upper construction platform and the lower construction platform respectively; the freight elevator can pass through the upper construction platform and the lower construction platform in sequence when it is raised and lowered, so as to transfer materials on the upper construction platform and the lower construction platform to each other;

[0005] The bottom surfaces of the upper construction platform and the lower construction platform are provided with slots on the same vertical line, and a turning plate is provided in the slots. The upper construction platform and the lower construction platform, the freight elevator and the loading seat pass through the slots when they are lifted or lowered, and the turning plate is automatically closed and opened by the intelligent control of the control mechanism.

[0006] As a further preference, the width dimensions of the feeding seat and the freight elevator are respectively smaller than the slot width dimension of the slot.

[0007] As a further preferred embodiment, the control mechanism includes an assembly seat fixed on the bottom surfaces of the upper construction platform and the lower construction platform, the assembly seat is close to the slot, the assembly seat is provided with assembly holes communicating left and right, a limiting rod capable of moving left and right is installed in the assembly hole, the control mechanism also includes an electric cylinder fixed on the assembly seat, the limiting rod is a U-shaped bending rod, the limiting rod is a rotating end of the U-shaped bending end away from the rotating end of the turn plate, the action rod of the electric cylinder is connected to the U-shaped end of the limiting rod, the other end of the limiting rod reaches the bottom of the turn plate to limit the downward rotation of the turn plate, the control mechanism also includes a photoelectric switch arranged on the turn plate, and also includes a distance sensor fixed on the feeding seat and the freight elevator, the photoelectric switch is electrically connected to the electric cylinder.

[0008] As a further preference, the outer sides of the upper construction platform and the lower construction platform are both provided with a first enclosure portion protruding forward, and the first enclosure portion is located at the front side of the notch.

[0009] As a further preferred embodiment, the sides of the upper construction platform and the lower construction platform are both provided with a second enclosure portion protruding toward the side, and the second enclosure portion is located on the side of the notch.

[0010] As a further preference, the bottom surface shapes of the upper construction platform and the lower construction platform are consistent with their contour shapes.

[0011] As a further preferred embodiment, the control mechanism also includes a reset assembly arranged on the rear side of the slot, the reset assembly includes a driven wheel fixed on the rear end of the rotating shaft where the rotating plate is located, and a driving wheel installed above the driven wheel through a bracket, and each of the upper and lower sides of the slot is respectively installed with a driving wheel symmetrically installed in the same manner, and also includes a tension spring connected to the driving wheel and the side of the upper construction platform or the lower construction platform, the outer cylindrical surface of the driving wheel is located on the lifting path of the loading seat and the freight elevator, the diameter of the driving wheel is larger than the diameter of the driven wheel, and a secondary wheel driven by the driven wheel is provided behind the driving wheel, and the diameter of the secondary wheel is smaller than the diameter of the driving wheel.

[0012] As a further preferred embodiment, a wheel groove is formed on the driving wheel, and one end of the tension spring connected to the driving wheel is located in the wheel groove.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. The intelligent integrated construction platform of the present invention can meet the construction requirements of protection and facade decoration of high-rise reinforced concrete frame structure public buildings. The upper construction platform and the lower construction platform are placed outside the building in a multi-column slide rail matching manner, and have strong adhesion. In terms of function, it completely replaces the attached lifting scaffolding, electric hanging basket, roof cantilever frame, freight elevator, cantilever unloading platform, and ground-floor scaffolding, providing a safe and economical operation and protection platform.

[0015] 2. Slots are opened on the upper construction platform and the lower construction platform. The freight elevator and the loading seat are set on the steel structure column through the slide rail relative to the slot. The control mechanism and the turn plate are set in the slot. The freight elevator and the loading seat pass through the slot between the upper construction platform and the lower construction platform and when they are used on the ground. This not only makes the back of the upper construction platform and the lower construction platform closer to the main building and reduces shaking. Moreover, the turn plate can be automatically opened and closed under the control of the intelligent control mechanism. When the turn plate closes the slot, it prevents people from falling. When the turn plate is opened from the slot, it provides avoidance space for the lifting and lowering actions of the freight elevator and the loading seat. The structure is reasonable. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a main plane schematic diagram of the present invention;

[0017] Figure 2 It is a schematic diagram of the three-dimensional structure of the present invention;

[0018] Figure 3 This is a schematic diagram of the present invention from a rear side perspective, in which the control mechanism of the upper construction platform is removed to facilitate viewing of the position and structure of the notch;

[0019] Figure 4 The present invention is Figure 3 The enlarged schematic diagram of the A part is shown;

[0020] Figure 5 The present invention is Figure 3 The schematic diagram from the upward perspective is introduced;

[0021] Figure 6 The present invention is Figure 3 The working principle diagram from another perspective is introduced.

[0022] In the figure: 1. Steel structure column; 2. Slide rail; 3. Electric hoist; 4. Upper construction platform; 5. Lower construction platform; 6. Feeding seat; 7. Freight elevator; 8. Notch; 9. Turntable; 10. Control mechanism; 11. Assembly seat; 12. Assembly hole; 13. Limiting rod; 14. Electric cylinder; 15. Photoelectric switch; 16. Distance sensor; 17. First enclosure; 18. Second enclosure; 19. Reset assembly; 20. Driven wheel; 21. Driving wheel; 22. Tension spring; 23. Wheel groove; 24. Auxiliary wheel. DETAILED DESCRIPTION

[0023] The above and other embodiments and advantages of the present invention are described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments.

[0024] In one embodiment, Figure 1-Figure 6 As shown: This embodiment provides an intelligent construction integrated construction platform, including a plurality of steel structure columns 1, which are vertically fixed upward on the outer wall of the building, and the outer surface of the steel structure columns 1 is fixed with a slide rail 2, and the top of the steel structure column 1 is fixed with a truss 2, which is located above the building, and a plurality of electric hoists 3 are fixed on the truss 2, and the electric hoist 3 is controlled by a remote controller or a handle, and an upper construction platform 4 and a lower construction platform 5 are installed on some of the slide rails 2, and the upper construction platform 4 and the lower construction platform 5 are respectively connected to two electric hoists 3 by cables. When the electric hoist 3 retracts and releases the cable, it lifts and lowers the upper construction platform 4 and the lower construction platform 5. A charging seat 6 is also provided on part of the slide rails 2, and a freight elevator 7 is also provided on part of the slide rails 2. The charging seat 6 and the freight elevator 7 are connected to part of the electric hoist 3 through cables. When the charging seat 6 is lifted or lowered, it can pass through the upper construction platform 4 and the lower construction platform 5 in sequence to add materials to the upper construction platform 4 and the lower construction platform 5 respectively; when the freight elevator 7 is lifted or lowered, it can pass through the upper construction platform 4 and the lower construction platform 5 in sequence to transfer materials on the upper construction platform 4 and the lower construction platform 5 to each other.

[0025] The bottom surfaces of the upper construction platform 4 and the lower construction platform 5 are provided with slots 8 on the same vertical line, and a turning plate 9 is provided in the slots 8. A control mechanism 10 is provided on the upper construction platform 4 and the lower construction platform 5. The freight elevator 7 and the loading seat 6 pass through the slot 8 when they are lifted or lowered, and the turning plate 9 is automatically closed and opened by the intelligent control of the control mechanism 10.

[0026] The control mechanism 10 includes an assembly seat 11 fixed on the bottom surface of the upper construction platform 4 and the lower construction platform 5. The assembly seat 11 is close to the slot 8. An assembly hole 12 communicating left and right is opened on the assembly seat 11. A limiting rod 13 capable of moving left and right is installed in the assembly hole 12. The control mechanism 10 also includes an electric cylinder 14 fixed on the assembly seat 11. The limiting rod 13 is a U-shaped bending rod. The limiting rod 13 is a rotating end of the U-shaped bending end away from the rotating end of the rotating plate 9. The action rod of the electric cylinder 14 is connected to the U-shaped end of the limiting rod 13. The other end of the limiting rod 13 reaches the bottom of the rotating plate 9 to limit the rotating plate 9 from rotating downward. The control mechanism 10 also includes a photoelectric switch 15 arranged on the rotating plate 9, and also includes a distance sensor 16 fixed on the feeding seat 6 and the freight elevator 7. The photoelectric switch 15 is electrically connected to the electric cylinder 14.

[0027] The control mechanism 10 also includes a reset component 19 arranged on the rear side of the notch 8. The reset component 19 includes a driven wheel 20 fixed on the rear end of the rotating shaft where the rotating plate 9 is located, and includes a driving wheel 21 installed above the driven wheel 20 through a bracket. Each of the upper and lower sides of each notch 8 is installed with a driving wheel 21 that is symmetrical up and down in the same installation method. It also includes a tension spring 22 connected to the driving wheel 21 and the side of the upper construction platform 4 or the lower construction platform 5. The outer cylindrical surface of the driving wheel 21 is located on the lifting path of the feeding seat 6 and the freight elevator 7. The diameter of the driving wheel 21 is larger than the diameter of the driven wheel 20. A secondary wheel 24 driven by the driven wheel 20 is provided behind the driving wheel 21. A wheel groove 23 is opened on the driving wheel 21. One end of the tension spring 22 connected to the driving wheel 21 is located in the wheel groove 23. When the driving wheel 21 rotates, the wheel groove 23 is used to retract and release the tension spring 22 to prevent the tension spring 22 from deflecting left and right.

[0028] Working principle and effect: The steel structure columns 1 are fixed on the outer wall of the building. The upper construction platform 4 and the lower construction platform 5 are restricted on the building by these steel structure columns 1 and the slide rails 2. The upper construction platform 4 and the lower construction platform 5 can be lifted and lowered along the steel structure columns 1 by the electric hoist 3. The charging seat 6 or the freight elevator 7 can also be lifted and lowered by other electric hoists 3. Since the charging seat 6, the freight elevator 7, the upper construction platform 4 and the lower construction platform 5 are arranged on the steel structure columns 1 through the slide rails 2, their adhesion strength is greater than that of the traditional hanging basket. There will be no shaking during lifting. It is safer to lift workers with the upper construction platform 4 and the lower construction platform 5, and it is safer to lift materials with the loading seat 6 and the freight elevator 7. There are two upper and lower construction platforms during construction, and these two construction platforms are lifted and lowered separately according to construction needs. For a 200-meter high-rise building, they can be lifted and lowered within 100 meters respectively. In order to complete high-rise construction, the lifting stroke is divided into two parts. According to different needs, workers can selectively stand on the upper construction platform 4 and the lower construction platform 5. The construction process is more flexible and the construction efficiency is also improved.

[0029] In addition, Figures 3 to 6As shown, when unloading, the electric hoist 3 releases the cable, and the cable brings the loading seat 6 or the freight elevator 7 down (for the convenience of describing the following related content, the freight elevator 7 is taken as an example). When the freight elevator 7 brings the distance sensor 16 down to the proximity distance with the photoelectric switch 15 on the top surface of the rotating plate 9 and reaches the sensing distance, the photoelectric switch 15 sends a command to the electric cylinder 14, so that the action rod of the electric cylinder 14 pops out the limiting rod 13, and the open end of the limiting rod 13 leaves the bottom surface of the rotating plate 9. The bottom surface of the rotating plate 9 loses its restriction, and when the freight elevator 7 descends to the proximity of the rotating plate 9, it will use the side to crush the driving wheel 21 to rotate, and the driving wheel 21 will rotate with the auxiliary wheel 24, and the auxiliary wheel 24 and the belt transmission relationship will drive the driven wheel 20 to rotate, and the driven wheel 20 will drive the rotating shaft to rotate, and the rotating shaft The shaft drives the rotating plate 9 to deflect downward, making the slot 8 more advanced and effectively opened. At the same time, the driving wheel 21 effectively winds the tension spring 22 into the wheel groove 23, so that the tension spring 22 stores elastic force. When the freight elevator 7 passes through the slot 8 and continues to descend away from the slot 8, the tension spring 22 rebounds and releases the tension, rotating the driving wheel 21, and the driven wheel 20 rotates by the belt transmission relationship, and the driven wheel 20 rotates with the rotating shaft, and the rotating shaft drives the rotating plate 9 to rotate upward into the slot 8 again, closing the slot 8. As the freight elevator 7 continues to descend with the distance sensor 16 to the respective distances from the photoelectric switch 15 reaching the sensing distance, the photoelectric switch 15 sends a command to the electric cylinder 14 again, and the action rod of the electric cylinder 14 acts in the opposite direction to pull the limiting rod 13 back to the bottom side of the rotating plate 9. When the freight elevator 7 is lifted up, the distance sensor 16 will be brought up, and a photoelectric switch 15 is also provided on the bottom of the rotating plate 9. When the distance sensor 16 rises to the sensing distance with the photoelectric switch 15 on the bottom of the rotating plate 9, the photoelectric switch 15 sends a command to the electric cylinder 14 and pops the limit rod 13 out again. The open end of the limit rod 13 leaves the bottom of the rotating plate 9, and the bottom of the rotating plate 9 loses its restriction. When the freight elevator 7 rises and approaches the rotating plate 9, the driving wheel 21 on the bottom side of the rotating plate 9 is rotated by rolling the side. The driving wheel 21 will also rotate with the driven wheel 20 through the belt transmission relationship and the auxiliary wheel 24. The driven wheel 20 rotates with the rotating shaft, and the rotating shaft The rotating plate 9 rotates downward to open the slot 8, and at the same time, the driving wheel 21 winds and tightens the bottom side tension spring 22 into the wheel groove 23 of the bottom side driving wheel 21. The bottom side tension spring 22 stores elastic force. After the freight elevator 7 passes through the slot 8 and is lifted, the bottom side tension spring 22 rebounds to release the tension, and the bottom side driving wheel 21 rotates. The driven wheel 20 is rotated by the belt transmission relationship, and the driven wheel 20 rotates with the rotating shaft, and the rotating plate 9 is automatically rotated upward to the slot 8 by the rotating shaft to close the slot 8. As the freight elevator 7 continues to rise with the distance sensor 16 until the distance from the photoelectric switch 15 reaches the sensing distance, the photoelectric switch 15 sends a command to the electric cylinder 14 again, and the action rod of the electric cylinder 14 acts in the opposite direction to pull the limit rod 13 back to the bottom side of the rotating plate 9 to form a limit.

[0030] It can be seen that the opening of the slot 8 does not interfere with the existence of the upper construction platform 4 and the lower construction platform 5 when the freight elevator 7 or the charging seat 6 is lifted or lowered, nor does it affect the normal use of the upper construction platform 4 and the lower construction platform 5. At the same time, the freight elevator 7 or the charging seat 6 is easy to operate whether it is lifting materials to the upper construction platform 4 and the lower construction platform 5 for use, or placing the excess goods on the ground after the construction of the upper construction platform 4 and the lower construction platform 5. A rotating plate 9 is set in the slot 8, and a control mechanism 10 for controlling the self-locking of the rotating plate 9 is set at the relevant position of the slot 8. It can be seen that the rotating plate 9 on the slot 8 automatically opens before the freight elevator 7 or the charging seat 6 passes through the slot 8, and the rotating plate 9 on the slot 8 automatically closes after passing through the slot 8. When closing, the limiting rod 13 is limited to the bottom side of the rotating plate 9, and the effective treads of the upper construction platform 4 and the lower construction platform 5 are made up by the rotating plate 9 to prevent workers from stepping on empty space.

[0031] The diameter of the secondary wheel 24 is smaller than that of the driving wheel 21 . When the driving wheel 21 rolls on the side of the freight elevator 7 or the charging seat 6 and rotates, it will not affect the secondary wheel 24 . The secondary wheel 24 only serves to provide power to the driven wheel 20 .

[0032] like Figure 2 As shown, the outer sides of the upper construction platform 4 and the lower construction platform 5 are provided with a first enclosure portion 17 protruding forward, and the first enclosure portion 17 is located on the front side of the notch 8, which increases the plane's operating range. The sides of the upper construction platform 4 and the lower construction platform 5 are provided with a second enclosure portion 18 protruding toward the side, and the second enclosure portion 18 is located on the side of the notch 8. The bottom surface shape of the upper construction platform 4 and the lower construction platform 5 is consistent with its contour shape. The second enclosure portion 18 is close to the installation position of the control mechanism 10 and the reset assembly 19, so the closer the effective operating range of the two platforms is to the control mechanism 10 and the reset assembly 19, the larger it is, reducing the interference of the control mechanism 10 and the reset assembly 19 on manual work.

[0033] like Figure 2 , Figure 5 as well as Figure 6 As shown, the width dimensions of the loading seat 6 and the freight elevator 7 are respectively smaller than the slot width dimension of the slot 8. When the loading seat 6 or the freight elevator 7 is raised or lowered, it passes through the slot 8 and passes through the upper construction platform 4 and the lower construction platform 5.

[0034] The above orientation designations do not represent the specific orientations of the components in this implementation scheme. This implementation scheme is only for the convenience of describing the scheme, and the orientations are described relatively with reference to the figures. In essence, the specific orientations of the components are described according to their actual installation and actual use as well as the customary orientations of technicians in this field. This is hereby explained.

[0035] The specific implementation methods described above further describe the invention purpose, technical solutions, and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the protection scope of the present invention. It is particularly pointed out that for those skilled in the art, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An intelligent integrated construction platform, characterized in that: The invention comprises a plurality of steel structure columns (1), wherein the plurality of steel structure columns (1) are vertically fixed upward on the outer wall of a building, a slide rail (2) is fixed on the outer surface of each of the steel structure columns (1), a truss (2) is fixed on the top of each of the steel structure columns (1), the truss (2) is located above the building, a plurality of electric hoists (3) are fixed on the truss (2), an upper construction platform (4) and a lower construction platform (5) are installed on some of the slide rails (2), the upper construction platform (4) and the lower construction platform (5) are respectively connected to two of the electric hoists (3) by cables, and when the electric hoist (3) retracts and releases the cable, it lifts and lowers the upper construction platform (4) and the lower construction platform (5), a charging seat (6) is also provided on some of the slide rails (2), and a freight elevator (7) is also provided on some of the slide rails (2), and the charging seat (6) and the freight elevator (7) are connected to some of the electric hoists by cables. (3), the feeding seat (6) can pass through the upper construction platform (4) and the lower construction platform (5) in sequence when it is lifted or lowered, so as to feed materials to the upper construction platform (4) and the lower construction platform (5) respectively; the freight elevator (7) can pass through the upper construction platform (4) and the lower construction platform (5) in sequence when it is lifted or lowered, so as to transfer materials on the upper construction platform (4) and the lower construction platform (5) to each other; a notch (8) on the same vertical line is provided on the bottom load surface of the upper construction platform (4) and the lower construction platform (5), a rotating plate (9) is provided in the notch (8), and a control mechanism (10) is provided on the upper construction platform (4) and the lower construction platform (5); the freight elevator (7) and the feeding seat (6) pass through the notch (8) when they are lifted or lowered, and the rotating plate (9) is automatically closed and opened by intelligently controlling the control mechanism (10).

2. The intelligent integrated construction platform according to claim 1, characterized in that: The width dimensions of the feeding seat (6) and the freight elevator (7) are respectively smaller than the slot width dimension of the slot opening (8).

3. The intelligent integrated construction platform according to claim 2, characterized in that: The control mechanism (10) comprises an assembly seat (11) fixed on the bottom surface of the upper construction platform (4) and the lower construction platform (5), the assembly seat (11) being close to the notch (8), the assembly seat (11) being provided with an assembly hole (12) communicating with each other on the left and right, the assembly hole (12) being provided with a limiting rod (13) capable of moving left and right, the control mechanism (10) further comprising an electric cylinder (14) fixed on the assembly seat (11), the limiting rod (13) being a U-shaped bending rod, the limiting rod (13) being The U-shaped bent end is away from the rotating end of the rotating plate (9), the action rod of the electric cylinder (14) is connected to the U-shaped end of the limiting rod (13), and the other end of the limiting rod (13) reaches the bottom of the rotating plate (9) to limit the downward rotation of the rotating plate (9). The control mechanism (10) also includes a photoelectric switch (15) arranged on the rotating plate (9) and a distance sensor (16) fixed on the feeding seat (6) and the freight elevator (7), and the photoelectric switch (15) is electrically connected to the electric cylinder (14).

4. The intelligent integrated construction platform according to claim 2, characterized in that: The outer surfaces of the upper construction platform (4) and the lower construction platform (5) are both provided with a first enclosure portion (17) protruding forward, and the first enclosure portion (17) is located at the front side of the notch (8).

5. The intelligent integrated construction platform according to claim 4, characterized in that: The sides of the upper construction platform (4) and the lower construction platform (5) are both provided with a second enclosure portion (18) protruding toward the side, and the second enclosure portion (18) is located on the side of the notch (8).

6. The intelligent integrated construction platform according to claim 5, characterized in that: The bottom surface shapes of the upper construction platform (4) and the lower construction platform (5) are consistent with their contour shapes.

7. The intelligent integrated construction platform according to claim 6, characterized in that: The control mechanism (10) further comprises a reset assembly (19) arranged at the rear side of the notch (8), the reset assembly (19) comprising a driven wheel (20) fixed on the rear end of the rotating shaft where the rotating plate (9) is located, a driving wheel (21) mounted above the driven wheel (20) through a bracket, and a tension spring (22) connected between the driving wheel (21) and the side of the upper construction platform (4) or the lower construction platform (5). Each of the upper and lower sides of the notch (8) is respectively mounted with a driving wheel (21) symmetrical in the same manner, the outer circumference of the driving wheel (21) being located on the lifting path of the feeding seat (6) and the freight elevator (7), the diameter of the driving wheel (21) being larger than the diameter of the driven wheel (20), and a secondary wheel (24) being driven together with the driven wheel (20) is arranged behind the driving wheel (21), the diameter of the secondary wheel (24) being smaller than the diameter of the driving wheel (21).

8. The intelligent integrated construction platform according to claim 7, characterized in that: The driving wheel (21) is provided with a wheel groove (23), and one end of the tension spring (22) connected to the driving wheel (21) is located in the wheel groove (23).

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