Spraying dust removal equipment for construction site construction
By designing spray dust removal equipment with automatic winding and rotary spraying functions, the problem of exposed damage to the water pipe is solved, the service life of the equipment is extended and the spraying efficiency is improved, and the dust removal needs are adapted to the various scenarios.
Patent Information
- Application Number
- CN202420895325.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-28
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2034-04-28
AI Technical Summary
The water pipes of existing spray dust removal equipment are exposed and are susceptible to sun exposure and trampling, resulting in a shortened service life.
A spray dust removal device including a fixed box, a support plate, a moving wheel, an automatic water spray assembly, a manual water spray assembly, an anti-displacement assembly and a winding assembly are designed to realize automatic hose by driving a rotating roller and a lifting cylinder by a motor. Automatic rise of the winding and rotating spray head to prevent the hose from being exposed and expand the spray range.
Effectively prevent the hose from being damaged by the sun and being trampled, extend its service life, and reduce human resources consumption through automatic spraying function, adapting to spray dust removal needs in different sizes and areas.
Smart Images
Figure CN222173531U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of dust removal equipment, in particular to spray dust removal equipment used for construction sites. Background Art
[0002] Since there is a lot of sand and dust on the construction site, dust will easily fly once the wind blows, so it is necessary to use spray dust removal equipment to spray water to avoid dust flying.
[0003] According to the announcement number: CN217163396U, it involves the field of spray dust removal, specifically an easy-to-use spray dust removal equipment for construction safety engineering. The water pipes of the above-mentioned spray dust removal equipment are exposed to the outside. The water pipes are easily damaged by being exposed to the sun for a long time, which greatly reduces the service life of the water pipes.
[0004] Based on this, a spray dust removal device for construction site is now provided, which can eliminate the disadvantages of the existing devices. Utility Model Content
[0005] The utility model aims to provide a spray dust removal device for construction sites, so as to solve the problem that the water pipes of the existing spray dust removal devices are exposed to the outside and are easily damaged.
[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:
[0007] A spray dust removal equipment for construction site construction comprises a fixed box, a support plate, and moving wheels, wherein four moving wheels opposite to each other are arranged on the lower surface of the support plate, the upper surface of the support plate is fixedly connected to the fixed box, and also comprises an automatic water spraying assembly, a manual water spraying assembly, an anti-displacement assembly, and a winding assembly, the inner bottom wall of the fixed box is fixedly connected to a water tank, the side wall of the water tank is penetrated and fixedly connected with a connecting pipe, the connecting pipe is provided with a water pump, the manual water spraying assembly comprises a hand-held nozzle and a hose, the connecting pipe is connected to a hose, one end of the hose away from the connecting pipe extends through and outside the fixed box and is fixedly connected with a hand-held nozzle, a valve is provided on the hand-held nozzle, the winding assembly is arranged in the fixed box, and is used to wind up the hose, the anti-displacement assembly is arranged on the lower surface of the fixed box, and is used to prevent the equipment from being displaced during the automatic water spraying process, and the automatic water spraying assembly is arranged on the upper surface of the fixed box, and is used to automatically spray water.
[0008] On the basis of the above technical solutions, the present invention also provides the following optional technical solutions:
[0009] In an optional scheme: the winding assembly includes a first motor, a rotating roller, and a rotating disk; the outer wall of the fixed box is fixedly connected to the motor box, the inner wall of the motor box is fixedly connected to the first motor, the inner wall of the fixed box is rotatably connected to the rotating roller through a bearing, the output end of the first motor extends into the fixed box and is fixedly connected to the rotating roller, the side wall of the rotating roller away from the first motor is fixedly connected to the rotating disk, the end of the hose away from the handheld nozzle is fixedly connected to the side wall of the rotating disk, a water cavity is opened in the rotating disk, the hose is communicated with the water cavity of the rotating disk, the connecting pipe is rotatably connected to the side wall of the rotating disk through a bearing, and the connecting pipe is communicated with the water cavity of the rotating disk.
[0010] In an optional scheme: the automatic water sprinkler assembly includes a rotating sprinkler head, a third lifting cylinder, and a telescopic bellows. The top wall of the fixed box is rotatably connected to a bidirectional screw via a bearing, and the bidirectional screw is threadedly connected to a second lifting cylinder. A connecting plate is fixedly connected to the side wall of the second lifting cylinder, and the side wall of the connecting plate away from the second lifting cylinder is rotatably connected to the third lifting cylinder via a bearing. The third lifting cylinder extends to the outside of the fixed box, and the side wall of the third lifting cylinder outside the fixed box is fixedly connected to the rotating sprinkler head. A rotating sprinkler head groove is provided on the upper surface of the fixed box, and the rotating sprinkler head is slidably connected to the inner side wall of the rotating sprinkler head groove, and a telescopic bellows is fixedly connected to the side wall of the connecting pipe, and one end of the telescopic bellows away from the connecting pipe extends into the third lifting cylinder and is rotatably connected to the rotating sprinkler head via a bearing, and a valve is provided in the rotating sprinkler head.
[0011] In an optional solution: a third motor is fixedly connected to the lower surface of the connecting plate, a second gear is fixedly connected to the output end of the third motor, a first gear is fixedly connected to the circumferential side wall of the third lifting cylinder, and the first gear is meshed with the second gear.
[0012] In an optional solution: the anti-displacement component includes a limit plate and a first lifting cylinder, the end of the bidirectional screw away from the second lifting cylinder is threadedly connected to the first lifting cylinder, the first lifting cylinder extends through and extends to the lower surface of the support plate, the first lifting cylinder and the support plate are slidably connected, and the lower surface of the first lifting cylinder is fixedly connected to the limit plate.
[0013] In an optional solution: a non-slip rubber pad is provided on the lower surface of the limiting plate.
[0014] In an optional solution: the first lifting cylinder is a quadrangular prism.
[0015] In an optional scheme: the bidirectional screw is fixedly connected to the second synchronous pulley, the bottom wall of the fixed box is fixedly connected to the second motor, the output end of the second motor is fixedly connected to the rotating shaft, the rotating shaft is fixedly connected to the first synchronous pulley, and the first synchronous pulley and the second synchronous pulley are jointly cooperated with a synchronous belt.
[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:
[0017] 1. The utility model can start the first motor by manually holding the handheld nozzle, the first motor drives the rotating roller to rotate, the rotating roller drives the hose to unwind, the hose is pulled out and stretched, the valve in the handheld nozzle is opened, and manual spraying and dust removal are performed on the area that the equipment cannot enter, so that the equipment has a wider range of use and is suitable for spraying and dust removal in various areas of different sizes.
[0018] 2. The utility model starts the first motor, the first motor drives the rotating roller to rotate, and the rotating roller drives the hose to be rolled into the fixed box, so as to prevent the hose from being exposed to the sun or damaged by being stepped on by people, thereby improving the service life of the hose.
[0019] 3. The utility model drives the second lifting cylinder to rise by rotating the bidirectional screw, and the rising of the second lifting cylinder drives the connecting plate to rise, and the rising of the connecting plate drives the third lifting cylinder to rise, and the third lifting cylinder drives the rotating spray head to rise and leave the rotating spray head slot, open the valve in the rotating spray head, start the water pump, and water is transported from the water tank to the rotating spray head for spraying, and the surrounding area is automatically sprayed for dust removal. There is no need for personnel to hold the spray head to spray the surrounding area, which is more convenient to use and saves human resources. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 It is a structural schematic diagram of the utility model.
[0021] Figure 2 This is a first viewing angle diagram of the present invention.
[0022] Figure 3 It is a schematic diagram of the rising of the rotary spray head of the utility model.
[0023] Figure 4 It is a schematic diagram of stretching the handheld spray head of the utility model.
[0024] Figure 5 This is a cross-sectional view of the internal structure of the fixed box of the utility model.
[0025] Figure 6 This is a first perspective view of the internal structure of the fixed box of the utility model.
[0026] Figure 7 This is a second viewing angle diagram of the internal structure of the fixed box of the present utility model.
[0027] Figure 8 It is a schematic diagram of the internal structure of the rotating disk of the utility model.
[0028] Fig. 9 It is a schematic diagram of the internal structure of the first lifting cylinder of the utility model.
[0029] Fig.10 For the utility model Figure 6 Enlarged view of point A in the middle.
[0030] Notes on figure numbers: 1 fixed box, 2 support plate, 3 rotating spray head, 4 moving wheel, 5 motor box, 6 limit plate, 7 handheld spray head, 8 hose, 9 water tank, 10 first motor, 11 rotating roller, 12 connecting pipe, 13 rotating disk, 14 second motor, 15 rotating shaft, 16 first synchronous pulley, 17 second synchronous pulley, 18 bidirectional screw, 19 first lifting cylinder, 20 second lifting cylinder, 21 third lifting cylinder, 22 first gear, 23 connecting plate, 24 second gear, 25 third motor, 26 telescopic bellows. DETAILED DESCRIPTION
[0031] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.
[0032] Example 1
[0033] In one embodiment, Figure 1-Figure 10 As shown, a spray dust removal equipment for construction site construction includes a fixed box 1, a support plate 2, and moving wheels 4. The lower surface of the support plate 2 is provided with four moving wheels 4 opposite to each other. The upper surface of the support plate 2 is fixedly connected to the fixed box 1, and also includes an automatic water spraying component, a manual water spraying component, an anti-displacement component, and a winding component. The bottom wall of the fixed box 1 is fixedly connected to a water tank 9, and the side wall of the water tank 9 is penetrated and fixedly connected with a connecting pipe 12, and a water pump is arranged on the connecting pipe 12. The manual water spraying component includes a handheld nozzle 7 and a hose 8. The connecting pipe 12 is connected to the hose 8, and one end of the hose 8 away from the connecting pipe 12 extends through the fixed box 1 and is fixedly connected to the handheld nozzle 7 outside the fixed box 1. A valve is arranged on the handheld nozzle 7. The winding component is arranged in the fixed box 1 for winding the hose 8. The anti-displacement component is arranged on the lower surface of the fixed box 1 for preventing the equipment from being displaced during the automatic water spraying process. The automatic water spraying component is arranged on the upper surface of the fixed box 1 for automatic water spraying. When it is necessary to spray water on an area that the equipment cannot enter, the handheld nozzle 7 can be manually held to start the first motor 10. The first motor 10 drives the rotating roller 11 to rotate, and the rotating roller 11 drives the hose 8 to untangle. The hose 8 is pulled out and stretched, and the valve in the handheld nozzle 7 is opened. Manual spraying and dust removal are performed on the area that the equipment cannot enter, so that the equipment has a wider range of use and is suitable for spraying and dust removal in areas of different sizes.
[0034] In one embodiment, Figure 6 and Figure 8 As shown, the winding assembly includes a first motor 10, a rotating roller 11, and a rotating disk 13. The outer wall of the fixed box 1 is fixedly connected to the motor box 5, the inner wall of the motor box 5 is fixedly connected to the first motor 10, the inner wall of the fixed box 1 is rotatably connected to the rotating roller 11 through a bearing, the output end of the first motor 10 extends through the fixed box 1 and is fixedly connected to the rotating roller 11, the side wall of the rotating roller 11 away from the first motor 10 is fixedly connected to the rotating disk 13, the end of the hose 8 away from the handheld spray head 7 is fixedly connected to the side wall of the rotating disk 13, a water cavity is opened in the rotating disk 13, the hose 8 is connected to the water cavity of the rotating disk 13, the connecting pipe 12 is rotatably connected to the side wall of the rotating disk 13 through a bearing, and the connecting pipe 12 is connected to the water cavity of the rotating disk 13. When the spraying is finished, the first motor 10 is started again, the first motor 10 drives the rotating roller 11 to rotate, and the rotating roller 11 drives the hose 8 to be rolled into the fixed box 1, so as to prevent the hose 8 from being exposed to the sun or being damaged by people, thereby improving the service life of the hose 8.
[0035] In one embodiment, Figure 6 and Figure 7 and Fig. 9 As shown, the automatic water spraying assembly includes a rotating sprinkler head 3, a third lifting cylinder 21, and a telescopic bellows 26. The inner top wall of the fixed box 1 is rotatably connected with a bidirectional screw 18 through a bearing, and the bidirectional screw 18 is threadedly connected with a second lifting cylinder 20. A connecting plate 23 is fixedly connected to the side wall of the second lifting cylinder 20. The side wall of the connecting plate 23 away from the second lifting cylinder 20 is rotatably connected with the third lifting cylinder 21 through a bearing. The third lifting cylinder 21 extends to the outside of the fixed box 1, and the side wall of the third lifting cylinder 21 located outside the fixed box 1 is fixedly connected with the rotating sprinkler head 3. A rotating sprinkler head groove is provided on the upper surface of the fixed box 1, and the rotating sprinkler head 3 is slidably connected to the inner side wall of the rotating sprinkler head groove. A telescopic bellows 26 is fixedly connected to the side wall of the connecting pipe 12, and one end of the telescopic bellows 26 away from the connecting pipe 12 extends into the third lifting cylinder 21 and is rotatably connected to the rotating sprinkler head 3 through a bearing. A valve is arranged in the rotating sprinkler head 3. The rotation of the bidirectional screw 18 drives the second lifting cylinder 20 to rise, and the rising of the second lifting cylinder 20 drives the connecting plate 23 to rise, and the rising of the connecting plate 23 drives the third lifting cylinder 21 to rise, and the third lifting cylinder 21 drives the rotary spray head 3 to rise and leave the rotary spray head slot, open the valve in the rotary spray head 3, start the water pump, and water is transported from the water tank 9 to the rotary spray head 3 for spraying, and the surrounding area is automatically sprayed for dust removal. There is no need for personnel to hold the spray head to spray the surrounding area, which is more convenient to use and saves human resources.
[0036] In one embodiment, Fig.10As shown, the lower surface of the connecting plate 23 is fixedly connected to a third motor 25, the output end of the third motor 25 is fixedly connected to a second gear 24, the circumferential side wall of the third lifting cylinder 21 is fixedly connected to a first gear 22, and the first gear 22 is meshed with the second gear 24. When the third motor 25 is started, the third motor 25 drives the second gear 24 to rotate, the second gear 24 drives the first gear 22 to rotate, the first gear 22 drives the third lifting cylinder 21 to rotate, and the third lifting cylinder 21 drives the rotating spray head 3 to rotate, so that the rotating spray head 3 performs rotating spraying, the spraying range is wider, and the spraying effect is better.
[0037] In one embodiment, Figure 5 and Fig. 9 As shown, the anti-displacement assembly includes a limit plate 6 and a first lifting cylinder 19, and the end of the bidirectional screw 18 away from the second lifting cylinder 20 is threadedly connected to the first lifting cylinder 19, and the first lifting cylinder 19 extends through and extends to the lower surface of the support plate 2. The first lifting cylinder 19 and the support plate 2 are slidably connected, and the lower surface of the first lifting cylinder 19 is fixedly connected to the limit plate 6. When the bidirectional screw 18 rotates, it drives the first lifting cylinder 19 to descend, and the first lifting cylinder 19 descends and drives the limit plate 6 to descend. The limit plate 6 descends and contacts the ground, increasing the friction of the ground and preventing the equipment from moving during the automatic water spraying process.
[0038] Example 2
[0039] In one embodiment, Figure 5 and Fig. 9 As shown, an anti-skid rubber pad is provided on the lower surface of the limit plate 6. Since the anti-skid rubber pad is provided on the lower surface of the limit plate 6, the friction between the limit plate 6 and the ground is further increased to prevent the device from moving during operation.
[0040] In one embodiment, Figure 6 As shown, the first lifting cylinder 19 is a quadrangular prism, which prevents the first lifting cylinder 19 from rotating with the bidirectional screw rod 18 during the descending process and being unable to descend.
[0041] In one embodiment, Figure 6 and Fig. 9 As shown, the bidirectional screw 18 is fixedly connected to the second synchronous pulley 17, the inner bottom wall of the fixed box 1 is fixedly connected to the second motor 14, the output end of the second motor 14 is fixedly connected to the rotating shaft 15, the rotating shaft 15 is fixedly connected to the first synchronous pulley 16, and the first synchronous pulley 16 and the second synchronous pulley 17 are jointly matched with a synchronous belt. Start the second motor 14, the second motor 14 drives the rotating shaft 15 to rotate, the rotating shaft 15 drives the first synchronous pulley 16 to rotate, the first synchronous pulley 16 drives the second synchronous pulley 17 to rotate through the synchronous belt, and the second synchronous pulley 17 drives the bidirectional screw 18 to rotate.
[0042] The above embodiment discloses a spray dust removal device for construction site construction. First, the device is moved to a position where spray dust removal is required through a moving wheel, and the second motor 14 is started. The second motor 14 drives the rotating shaft 15 to rotate, and the rotating shaft 15 drives the first synchronous pulley 16 to rotate. The first synchronous pulley 16 drives the second synchronous pulley 17 to rotate through the synchronous belt, and the second synchronous pulley 17 drives the bidirectional screw 18 to rotate.
[0043] The rotation of the bidirectional screw 18 drives the second lifting cylinder 20 to rise, and the rising of the second lifting cylinder 20 drives the connecting plate 23 to rise, and the rising of the connecting plate 23 drives the third lifting cylinder 21 to rise, and the third lifting cylinder 21 drives the rotating spray head 3 to rise and leave the rotating spray head slot, open the valve in the rotating spray head 3, start the water pump, and water is transported from the water tank 9 to the rotating spray head 3 to spray out, and the surrounding area is automatically sprayed for dust removal, and there is no need for personnel to hold the spray head to spray the surrounding area, which is more convenient to use and saves human resources;
[0044] The third motor 25 is started, the third motor 25 drives the second gear 24 to rotate, the second gear 24 drives the first gear 22 to rotate, the first gear 22 drives the third lifting cylinder 21 to rotate, and the third lifting cylinder 21 drives the rotary spraying head 3 to rotate, so that the rotary spraying head 3 performs rotary spraying, with a wider spraying range and a better spraying effect;
[0045] When the bidirectional screw 18 rotates, it drives the first lifting cylinder 19 to descend, and the first lifting cylinder 19 descends and drives the limit plate 6 to descend. The limit plate 6 descends and contacts the ground, increasing the friction of the ground to prevent the equipment from moving during the automatic water spraying process;
[0046] Since the lower surface of the limit plate 6 is provided with an anti-slip rubber pad, the friction between the limit plate 6 and the ground is further increased to prevent the device from moving during operation;
[0047] When it is necessary to spray water on an area that the equipment cannot enter, the handheld nozzle 7 can be manually held to start the first motor 10, the first motor 10 drives the rotating roller 11 to rotate, the rotating roller 11 drives the hose 8 to unwind, the hose 8 is pulled out and stretched, the valve in the handheld nozzle 7 is opened, and the area that the equipment cannot enter is manually sprayed for dust removal, so that the equipment has a wider range of use and is suitable for spraying dust removal in areas of different sizes;
[0048] When the spraying is finished, the first motor 10 is started again, the first motor 10 drives the rotating roller 11 to rotate, and the rotating roller 11 drives the hose 8 to be rolled into the fixed box 1, so as to prevent the hose 8 from being exposed to the sun or damaged by being stepped on by people, thereby improving the service life of the hose 8.
[0049] The above is only a specific implementation of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any person skilled in the art who is familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.
Claims
1. A spray dust removal device for construction sites, comprising a fixed box (1), a support plate (2), and moving wheels (4), wherein the lower surface of the support plate (2) is provided with four moving wheels (4) facing each other, and the upper surface of the support plate (2) is fixedly connected with the fixed box (1), characterized in that: It also comprises an automatic water spraying assembly, a manual water spraying assembly, an anti-displacement assembly and a reeling assembly. The inner bottom wall of the fixed box (1) is fixedly connected to a water tank (9). A connecting pipe (12) is fixedly connected to the side wall of the water tank (9). A water pump is arranged on the connecting pipe (12). The manual water spraying assembly comprises a handheld spray head (7) and a hose (8). The connecting pipe (12) is connected to the hose (8). One end of the hose (8) away from the connecting pipe (12) extends through the fixed box (1) and is fixedly connected to the handheld spray head (7). A valve is arranged on the handheld spray head (7). The reeling assembly is arranged in the fixed box (1) and is used to reel the hose (8). The anti-displacement assembly is arranged on the lower surface of the fixed box (1) and is used to prevent the device from being displaced during the automatic water spraying process. The automatic water spraying assembly is arranged on the upper surface of the fixed box (1) and is used to spray water automatically.
2. The spray dust removal equipment for construction site according to claim 1, characterized in that: The winding assembly comprises a first motor (10), a rotating roller (11), and a rotating disk (13); the outer wall of the fixed box (1) is fixedly connected to the motor box (5); the inner wall of the motor box (5) is fixedly connected to the first motor (10); the inner wall of the fixed box (1) is rotatably connected to the rotating roller (11) via a bearing; the output end of the first motor (10) extends through the fixed box (1) and is fixedly connected to the rotating roller (11); the side wall of the rotating roller (11) away from the first motor (10) is fixedly connected to the rotating disk (13); one end of the hose (8) away from the handheld spray head (7) is fixedly connected to the side wall of the rotating disk (13); a water cavity is provided in the rotating disk (13); the hose (8) is connected to the water cavity of the rotating disk (13); the connecting pipe (12) is rotatably connected to the side wall of the rotating disk (13) via a bearing; the connecting pipe (12) is connected to the water cavity of the rotating disk (13).
3. The spray dust removal equipment for construction site according to claim 2, characterized in that: The automatic water spraying assembly comprises a rotating spraying head (3), a third lifting cylinder (21), and a telescopic bellows (26); the inner top wall of the fixed box (1) is rotatably connected to a bidirectional screw (18) via a bearing; the bidirectional screw (18) is threadedly connected to a second lifting cylinder (20); a connecting plate (23) is fixedly connected to the side wall of the second lifting cylinder (20); the side wall of the connecting plate (23) away from the second lifting cylinder (20) is rotatably connected to a third lifting cylinder (21) via a bearing; the third lifting cylinder (21) extends through the fixed box (1) ), the side wall of the third lifting cylinder (21) located outside the fixed box (1) is fixedly connected to a rotating spray head (3), the upper surface of the fixed box (1) is provided with a rotating spray head groove, the rotating spray head (3) is slidably connected to the inner side wall of the rotating spray head groove, the side wall of the connecting pipe (12) is penetrated and fixedly connected with a telescopic bellows (26), the end of the telescopic bellows (26) away from the connecting pipe (12) extends into the third lifting cylinder (21) and is rotatably connected to the rotating spray head (3) through a bearing, and a valve is arranged in the rotating spray head (3).
4. The spray dust removal equipment for construction site according to claim 3, characterized in that: A third motor (25) is fixedly connected to the lower surface of the connecting plate (23), a second gear (24) is fixedly connected to the output end of the third motor (25), a first gear (22) is fixedly connected to the circumferential side wall of the third lifting cylinder (21), and the first gear (22) is meshed with the second gear (24).
5. The spray dust removal equipment for construction site according to claim 4, characterized in that: The anti-displacement assembly comprises a limit plate (6) and a first lifting cylinder (19); one end of the bidirectional screw (18) away from the second lifting cylinder (20) is threadedly connected to the first lifting cylinder (19); the first lifting cylinder (19) extends through and extends to the lower surface of the support plate (2); the first lifting cylinder (19) and the support plate (2) are slidably connected through and through; and the lower surface of the first lifting cylinder (19) is fixedly connected to the limit plate (6).
6. The spray dust removal equipment for construction site according to claim 5, characterized in that: The lower surface of the limiting plate (6) is provided with an anti-slip rubber pad.
7. The spray dust removal equipment for construction site according to claim 5, characterized in that: The first lifting cylinder (19) is a quadrangular prism.
8. The spray dust removal equipment for construction site according to claim 6, characterized in that: The bidirectional screw (18) is fixedly connected to a second synchronous pulley (17); the inner bottom wall of the fixed box (1) is fixedly connected to a second motor (14); the output end of the second motor (14) is fixedly connected to a rotating shaft (15); the rotating shaft (15) is fixedly connected to a first synchronous pulley (16); the first synchronous pulley (16) and the second synchronous pulley (17) are jointly matched with a synchronous belt.