Polishing apparatus

Abstract

The application belongs to the technical field of wind power equipment maintenance, and discloses a polishing device, which comprises a support mechanism, a first feeding mechanism, a second feeding mechanism, a polishing mechanism and a height measuring mechanism. The support mechanism is arranged above a component to be polished. The first feeding mechanism comprises a guide rail assembly arranged along an X direction and a transplanting assembly slidingly connected to the guide rail assembly. The second feeding mechanism is installed on the transplanting assembly. The polishing mechanism is connected to the second feeding mechanism, and the second feeding mechanism can adjust the position of the polishing mechanism in a Z direction. The polishing mechanism is used for polishing the component to be polished. The height measuring mechanism is arranged on the support mechanism and is configured to indicate the height of the component to be polished. The polishing device can improve the polishing precision and effect of a wind power blade, effectively reduce dust generated in the polishing process, and prevent harm to the health of operators.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wind power equipment maintenance, and in particular to a polishing device. BACKGROUND

[0002] With the continuous increase of the length of wind power blades, the strength of traditional glass fiber main beams has been unable to meet the structural design requirements of large wind power blades. Currently, large wind power blades mainly use pultruded sheets as blade main beams. Since the pultruded sheets are stacked structures, defects such as poor interlayer pouring may occur during the process of pouring the pultruded sheets and the blade shell integrally.

[0003] In the process of traditional main beam maintenance, the industry generally uses manual methods to polish the defect positions of the main beam. Slope polishing needs to be performed around the defect positions, but since manual polishing methods are used, the quality of the slope cannot be controlled. Moreover, the polishing piece is a circular structure, and the straightness of the polishing edge cannot be guaranteed. At the same time, the amount of dust generated by polishing is huge, which may pollute the environment and harm the health of the operators.

[0004] Therefore, there is an urgent need for a polishing device to solve the above problems. SUMMARY

[0005] The present application aims to provide a polishing device that can improve the polishing precision and effect of wind power blades and effectively reduce the dust generated during polishing to prevent harm to the health of operators.

[0006] To achieve this purpose, the present application adopts the following technical solutions:

[0007] The polishing device comprises:

[0008] A support mechanism is arranged above the component to be polished;

[0009] A first feeding mechanism comprises a guide rail assembly arranged in the X direction and a transplanting assembly slidingly connected to the guide rail assembly;

[0010] A second feeding mechanism is installed on the transplanting assembly;

[0011] A polishing mechanism is connected to the second feeding mechanism, the second feeding mechanism can adjust the position of the polishing mechanism in the Z direction, and the polishing mechanism is used for polishing the component to be polished;

[0012] A height measuring mechanism is arranged on the support mechanism and is configured to indicate the height of the component to be polished.

[0013] As a preferred scheme of the polishing device, the guide rail assembly comprises a first guide rail and a second guide rail which are parallel to each other and are arranged at intervals along the Y direction; the transplanting assembly comprises a connecting piece and a plurality of sliding blocks, the connecting piece is arranged across the first guide rail and the second guide rail, the plurality of sliding blocks are arranged on opposite sides of the connecting piece and are slidingly connected to the first guide rail or the second guide rail, and the polishing mechanism is connected to the connecting piece.

[0014] As a preferred scheme of the polishing device, the first feeding mechanism further comprises a first screw rod assembly which is arranged in parallel to the X direction, penetrates through the transplanting assembly, and is capable of driving the transplanting assembly to move along the guide rail assembly by rotating around its own axis.

[0015] As a preferred scheme of the polishing device, the first feeding mechanism further comprises a first driving part which is arranged at an end of the first screw rod assembly and is capable of driving the first screw rod assembly to rotate.

[0016] As a preferred scheme of the polishing device, the second feeding mechanism comprises a guide rail which is arranged in parallel to the Z direction and is fixed to the transplanting assembly, and a lifting piece which is slidingly connected to the guide rail, and the polishing mechanism is connected to the lifting piece.

[0017] As a preferred scheme of the polishing device, the second feeding mechanism further comprises a second screw rod assembly which is arranged in parallel to the Z direction, is connected to the lifting piece, and is capable of driving the lifting piece to slide along the guide rail by rotating around its own axis.

[0018] As a preferred scheme of the polishing device, the second feeding mechanism further comprises a second driving part which is arranged at an end of the second screw rod assembly which is away from the lifting piece, and is capable of driving the second screw rod assembly to rotate.

[0019] As a preferred scheme of the polishing device, the polishing mechanism comprises a grinding wheel protective cover which is connected to the second feeding mechanism and is arranged above the grinding wheel, and the grinding wheel which is rotationally connected to the second feeding mechanism.

[0020] As a preferred scheme of the polishing device, the polishing mechanism further comprises a driving assembly which is connected to the second feeding mechanism, and a transmission assembly which connects the driving assembly to a rotating shaft of the grinding wheel, the rotating shaft is arranged in parallel to the Y direction and is rotationally connected to the grinding wheel protective cover.

[0021] As a preferred scheme of the polishing device provided by the application, the transmission assembly comprises a first multiple V-belt pulley, a second multiple V-belt pulley and a multiple V-belt, the first multiple V-belt pulley is coaxially arranged on the output end of the driving assembly, the second multiple V-belt pulley is coaxially arranged on the rotating shaft, and the multiple V-belt is sleeved outside the first multiple V-belt pulley and the second multiple V-belt pulley, and the first multiple V-belt pulley and the second multiple V-belt pulley are respectively engaged with the inside of the multiple V-belt.

[0022] The application has the following beneficial effects:

[0023] The polishing device provided by the application comprises a support mechanism, a first feeding mechanism, a second feeding mechanism, a polishing mechanism and a height measuring mechanism. The support mechanism is arranged above a component to be polished, and provides a mounting position for the first feeding mechanism, the second feeding mechanism, the polishing mechanism and the height measuring mechanism. The first feeding mechanism comprises a guide rail assembly arranged along an X direction and a moving assembly slidingly connected to the guide rail assembly; the second feeding mechanism is mounted on the moving assembly; the polishing mechanism is connected to the second feeding mechanism, the second feeding mechanism can adjust the position of the polishing mechanism in a Z direction, and the polishing mechanism is used for polishing the component to be polished. That is, the first feeding mechanism and the second feeding mechanism can adjust the position of the polishing mechanism in two directions, the polishing mechanism adjusts the height through the second feeding mechanism, so that the polishing mechanism accurately abuts against the component to be polished, and the polishing mechanism moves along the axial direction of the component to be polished through the first feeding mechanism, so that the polishing mechanism polishes the entire component to be polished. Moreover, the polishing mechanism can effectively reduce dust generated in the polishing process, and prevent harm to the health of the operator. The height measuring mechanism is arranged on the support mechanism and is configured to indicate the height of the component to be polished. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the application, the following will briefly introduce the drawings needed in the description of the embodiments of the application. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of the contents of the embodiments of the application and the drawings.

[0025] Figure 1 is a front view of the polishing device provided by the embodiments of the application;

[0026] Figure 2 is a side view of the polishing device provided by the embodiments of the application;

[0027] Figure 3 is a top view of the polishing device provided by the embodiments of the application;

[0028] Figure 4 isFigure 3 Cross-sectional view along A-A direction;

[0029] Figure 5 Figure 3 Cross-sectional view along B-B direction.

[0030] In the figure:

[0031] 1, support mechanism; 11, support frame; 12, support leg; 13, bearing seat; 14, lifting ring;

[0032] 2, first feeding mechanism; 21, guide rail assembly; 211, first guide rail; 212, second guide rail; 22, transplanting assembly; 221, connecting piece; 2211, sliding block bottom plate; 2212, grinding wheel bottom plate; 222, sliding block; 23, first lead screw assembly; 24, first driving part;

[0033] 3, second feeding mechanism; 31, guide rail; 32, lifting piece; 33, second lead screw assembly; 34, second driving part; 35, lifting sliding block;

[0034] 4, grinding mechanism; 41, grinding wheel protective cover; 42, grinding wheel; 421, rotating shaft; 43, driving assembly; 44, transmission assembly; 441, first multiple V-belt pulley; 442, second multiple V-belt pulley; 443, multiple V-belt; 444, protective cover;

[0035] 5, height measuring mechanism; 51, fixing frame; 52, digital vernier caliper. DETAILED DESCRIPTION

[0036] The application will be further described below in conjunction with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the application, and not to limit the application. In addition, it should be noted that, for the convenience of description, only the parts related to the application are shown in the drawings, not all the structures.

[0037] In the description of the application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0038] ​In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0039] In the description of this embodiment, the terms "upper," "lower," "right," and "left," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0040] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0041] Figure 1 This shows a front view of the grinding equipment provided in an embodiment of the present invention; Figure 2 A side view of the grinding equipment provided in an embodiment of the present invention is shown; Figure 3 This shows a top view of the grinding equipment provided in an embodiment of the present invention;

[0042] Figure 4 Show Figure 3 Sectional view along the middle AA direction; Figure 5 Show Figure 3 A cross-sectional view along the BB direction. This embodiment provides a grinding device, which includes a support mechanism 1, a first feeding mechanism 2, a second feeding mechanism 3, a grinding mechanism 4, and a height measuring mechanism 5.

[0043] In the following description, the XYZ Cartesian coordinate system will be used as necessary, and the positional relationships of each component will be explained with reference to this XYZ Cartesian coordinate system. In this embodiment, the length direction of the first feed mechanism 2 is defined as the X direction, the direction orthogonal to the X direction (the operating direction of the second feed mechanism 3) is defined as the Y direction, and the direction orthogonal to both the X and Y directions is defined as the Z direction.

[0044] Specifically, the support mechanism 1 is arranged above the component to be polished, and includes a support frame 11 and a plurality of supporting legs 12. In the embodiment, the support mechanism 1 includes four supporting legs 12. The support frame 11 is arranged parallel to the X direction, and the four supporting legs 12 are arranged in a rectangular array and are evenly distributed on the bottom of the support frame 11. The first feeding mechanism 2 is arranged on the support frame 11, and the height measuring mechanism 5 includes four height measuring mechanisms 5, which are respectively arranged at the four top corners of the support frame 11.

[0045] Specifically, the height measuring mechanism 5 includes a fixing frame 51 and a digital vernier caliper 52. The fixing frame 51 is fixedly connected to the support frame 11, and the digital vernier caliper 52 is inserted into the fixing frame 51 and is configured to measure the height of the polishing surface of the component to be polished.

[0046] More specifically, the height of the supporting leg 12 can be adjusted. By adjusting the height of the supporting leg 12, the height of the support mechanism 1 can be adjusted. During the measurement of the digital vernier caliper 52, the height of the supporting leg 12 is adjusted at the same time, so that the height of the support mechanism 1 meets the polishing slope or groove depth requirement of the component to be polished.

[0047] More specifically, the support mechanism 1 further includes a plurality of lifting rings 14. The plurality of lifting rings 14 are arranged in a rectangular array and are evenly distributed at the four top corners of the top of the support frame 11. The lifting ring 14 can be connected to a lifting device, so as to facilitate the lifting of the polishing device by the lifting device.

[0048] Continuing to refer to Figures 1-5 , the first feeding mechanism 2 includes a guide rail assembly 21 arranged along the X direction and a transplanting assembly 22 slidingly connected to the guide rail assembly 21. The guide rail assembly 21 is arranged on the top of the support frame 11, and the transplanting assembly 22 can move along the guide rail assembly 21.

[0049] Specifically, referring to Figure 3 , the guide rail assembly 21 includes a first guide rail 211 and a second guide rail 212 arranged parallel to each other and spaced apart along the Y direction. The transplanting assembly 22 includes a connecting piece 221 and a plurality of sliding blocks 222. The connecting piece 221 is arranged across the first guide rail 211 and the second guide rail 212, and the plurality of sliding blocks 222 are evenly distributed on the opposite sides of the connecting piece 221 and are slidingly connected to the first guide rail 211 or the second guide rail 212. The polishing mechanism 4 is connected to the connecting piece 221. That is, the connecting piece 221 can establish a connection between the transplanting assembly 22 and the polishing mechanism 4, so that the transplanting assembly 22 can drive the polishing mechanism 4 to move along the first guide rail 211 and the second guide rail 212, thereby changing the position of the polishing mechanism 4 in the X direction.

[0050] More specifically, the first feeding mechanism 2 further comprises a first screw rod assembly 23, which is arranged parallel to the X direction and between the first guide rail 211 and the second guide rail 212, as shown in Figure 3 . The first screw rod assembly 23 is screwed through the transplanting assembly 22. Since the transplanting assembly 22 is guided by the cooperation of the plurality of sliding blocks 222 and the first guide rail 211 and the second guide rail 212, when the first screw rod assembly 23 rotates around its own axis, the first screw rod assembly 23 can drive the transplanting assembly 22 to move along the first guide rail 211 and the second guide rail 212.

[0051] More specifically, the support mechanism 1 further comprises two bearing seats 13. The two bearing seats 13 are arranged at the top of the two ends of the support frame body 11 in the X direction, and the first screw rod assembly 23 is screwed through the two bearing seats 13. The bearing seat 13 can provide reliable support for the first screw rod assembly 23 and improve the rotation reliability of the first screw rod assembly 23.

[0052] Optionally, the first feeding mechanism 2 further comprises a first driving part 24. The first driving part 24 is arranged at the end of the first screw rod assembly 23, and the first driving part 24 can drive the first screw rod assembly 23 to rotate. The first driving part 24 can be a rotating disc structure coaxially fixed to the end of the first screw rod assembly 23. By rotating the rotating disc structure by hand, the first screw rod assembly 23 can be driven to rotate. In other embodiments, the first driving part 24 can also be a servo motor, which is electrically connected to the controller. By controlling the axial feeding speed of the servo motor by using the controller, the rotation of the first screw rod assembly 23 can be efficiently and accurately realized to control the moving speed and moving distance of the transplanting assembly 22 in the X direction.

[0053] Continuing to refer to Figures 1-5 , the second feeding mechanism 3 is installed on the transplanting assembly 22, and the polishing mechanism 4 is connected to the second feeding mechanism 3. By using the action of the second feeding mechanism 3, the position adjustment of the polishing mechanism 4 in the Z direction can be realized.

[0054] Specifically, referring to Figure 3 and Figure 4The second feeding mechanism 3 comprises a guide rail 31, a lifting piece 32, a lifting slider 35 and a second screw assembly 33. The guide rail 31 is arranged parallel to the Z direction and is fixed to the connecting piece 221 by bolts. The lifting piece 32 is slidingly connected to the guide rail 31. The polishing mechanism 4 is connected to the bottom of the lifting piece 32. In this embodiment, the guide rail 31 is a dovetail groove guide rail. The lifting piece 32 is provided with a dovetail groove sliding groove on the side opposite to the dovetail groove guide rail. The lifting slider 35 is fixed to the side of the lifting piece 32. The second screw assembly 33 is arranged parallel to the Z direction and is screwed into the lifting slider 35. When the second screw assembly 33 rotates about its own axis, the lifting slider 35 and the lifting piece 32 fixed to the side of the lifting slider 35 can slide along the guide rail 31, thereby adjusting the position of the polishing mechanism 4 in the Z direction.

[0055] For concreteness, reference is made to Figure 3 and Figure 4 The connecting piece 221 comprises two sliding block bottom plates 2211 and a grinding wheel bottom plate 2212. The two sliding block bottom plates 2211 are arranged parallel to the Y direction and are spaced apart along the X direction. Each sliding block bottom plate 2211 is connected to a sliding block 222 at both ends. The grinding wheel bottom plate 2212 is located in the gap between the two sliding block bottom plates 2211 and is fixed to the side of the lifting piece 32 away from the lifting slider 35 by an L-shaped plate. The polishing mechanism 4 is installed on the lower side of the grinding wheel bottom plate 2212.

[0056] More concretely, the second feeding mechanism 3 further comprises a second driving part 34 arranged at the end of the second screw assembly 33 away from the lifting slider 35. The second driving part 34 can drive the second screw assembly 33 to rotate. The second driving part 34 can be a steering wheel coaxially fixed to the end of the second screw assembly 33. By rotating the steering wheel by hand, the second screw assembly 33 can be driven to rotate. In other embodiments, the second driving part 34 can also be a servo motor electrically connected to a controller. By controlling the axial feeding speed of the servo motor by using the controller, the rotation of the second screw assembly 33 can be efficiently and accurately realized to control the moving speed and distance of the polishing mechanism 4 in the Z direction.

[0057] For concreteness, reference is made to Figures 1-5The polishing mechanism 4 comprises a grinding wheel protective cover 41, a polishing wheel 42, a driving assembly 43 and a transmission assembly 44. The grinding wheel protective cover 41 covers the lower side of the grinding wheel bottom plate 2212 and is arranged above the polishing wheel 42. The driving assembly 43 is connected to the upper end surface of the grinding wheel bottom plate 2212 through a special-shaped support, and the driving assembly 43 is connected to the side of the lifting piece 32 away from the lifting slide 35. The driving assembly 43 is connected to the rotating shaft 421 of the polishing wheel 42 through the transmission assembly 44, the rotating shaft 421 is arranged in parallel to the Y direction and is rotationally connected to the grinding wheel protective cover 41. The driving assembly 43 can be selected from the prior art motor, which controls the polishing wheel 42 through the transmission assembly 44. The polishing wheel 42 is a diamond grinding wheel. The diameter of the polishing wheel 42 is 150 mm, the surface particle size is 60 mesh, and the rotating speed is 750 rpm.

[0058] Specifically, the transmission assembly 44 comprises a first multi-pulley 441, a second multi-pulley 442 and a multi-pulley belt 443. The first multi-pulley 441 is coaxially arranged on the output end of the driving assembly 43, and the second multi-pulley 442 is coaxially arranged on the rotating shaft 421. The multi-pulley belt 443 is sleeved outside the first multi-pulley 441 and the second multi-pulley 442, and the first multi-pulley 441 and the second multi-pulley 442 are respectively engaged with the inside of the multi-pulley belt 443. Through the transmission assembly 44, the rotation of the output end of the driving assembly 43 can be transmitted to the rotating shaft 421.

[0059] Further, the transmission assembly 44 further comprises a protective cover 444, which covers the outside of the first multi-pulley 441, the second multi-pulley 442 and the multi-pulley belt 443 to protect them.

[0060] The use steps of the polishing device provided by the embodiment are as follows:

[0061] Step one, use the hoisting device to hoist the polishing device to the wind blade, and fix the polishing device on the surface of the wind blade through the tight rope device;

[0062] Step two, measure the height of the surface to be polished of the component to be polished by using the height measuring mechanism 5, adjust the height of the supporting leg 12, and the height of the supporting mechanism 1 meets the polishing slope or groove depth requirement of the component to be polished;

[0063] Step three, start the driving assembly 43, and adjust the second feeding mechanism 3 to make the polishing wheel 42 grind the surface to be polished;

[0064] Step four, adjust the first feeding mechanism 2 to make the polishing wheel 42 move along the X direction, i.e. along the length direction of the wind blade, until the polishing is completed.

[0065] Obviously, the above embodiments of the present application are merely exemplary but not intended to limit the embodiments of the present application. Various obvious changes, re-adjustments and substitutions can be made by those skilled in the art without departing from the scope of the present application. It is not necessary or possible to enumerate all the embodiments. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A polishing apparatus characterized by comprising: The utility model relates to a kind of grinding machine, including: Support mechanism (1), the support mechanism (1) is erected above the component to be polished; First feeding mechanism (2), the first feeding mechanism (2) includes guide rail assembly (21) arranged along X direction and transplanting assembly (22) slidingly connected to the guide rail assembly (21); Second feeding mechanism (3), the second feeding mechanism (3) is installed in the transplanting assembly (22); Polishing mechanism (4), the polishing mechanism (4) is connected to the second feeding mechanism (3), the second feeding mechanism (3) can adjust the position of the polishing mechanism (4) in Z direction, and the polishing mechanism (4) is used for polishing the component to be polished; Height measuring mechanism (5), the height measuring mechanism (5) is arranged in the support mechanism (1), and is configured to indicate the height of the component to be polished; The guide rail assembly (21) includes first guide rail (211) and second guide rail (212) parallel to each other and spaced apart along Y direction;The transplanting assembly (22) includes connecting piece (221) and multiple sliders (222), the connecting piece (221) is arranged across the first guide rail (211) and the second guide rail (212), and multiple sliders (222) are arranged on opposite sides of the connecting piece (221) and are slidingly connected to the first guide rail (211) or the second guide rail (212), and the polishing mechanism (4) is connected to the connecting piece (221); The polishing mechanism (4) includes grinding wheel protective cover (41) and polishing wheel (42), the grinding wheel protective cover (41) is connected to the second feeding mechanism (3) and is arranged above the polishing wheel (42), and the polishing wheel (42) is rotationally connected to the second feeding mechanism (3).

2. The sharpening apparatus of claim 1, wherein, The first feeding mechanism (2) further includes first screw assembly (23), which is arranged parallel to the X direction, penetrates the transplanting assembly (22), and rotates around its own axis to drive the transplanting assembly (22) to move along the guide rail assembly (21).

3. The sharpening apparatus of claim 2, wherein, The first feeding mechanism (2) further includes first driving part (24), which is arranged at the end of the first screw assembly (23) and can drive the first screw assembly (23) to rotate.

4. The sharpening apparatus of claim 1, wherein, The second feeding mechanism (3) includes guide rail (31) and lifting piece (32), the guide rail (31) is fixedly arranged in the transplanting assembly (22) parallel to the Z direction, and the lifting piece (32) is slidingly connected to the guide rail (31), and the polishing mechanism (4) is connected to the lifting piece (32).

5. The sharpening apparatus of claim 4, wherein, The second feeding mechanism (3) further includes second screw assembly (33), which is arranged parallel to the Z direction, connected to the lifting piece (32), and rotates around its own axis to drive the lifting piece (32) to slide along the guide rail (31).

6. The sharpening apparatus of claim 5, wherein, The second feeding mechanism (3) further comprises a second driving part (34), which is arranged at the end of the second screw rod assembly (33) away from the lifting part (32) and can drive the second screw rod assembly (33) to rotate.

7. The sharpening apparatus of claim 1, wherein, The polishing mechanism (4) further comprises a driving assembly (43) and a transmission assembly (44), the driving assembly (43) is connected to the second feeding mechanism (3), the driving assembly (43) is connected to the rotating shaft (421) of the polishing wheel (42) through the transmission assembly (44), the rotating shaft (421) is arranged in parallel to the Y direction and is rotationally connected to the grinding wheel protective cover (41).

8. The sharpening apparatus of claim 7, wherein, The transmission assembly (44) comprises a first multiple V-belt pulley (441), a second multiple V-belt pulley (442) and a multiple V-belt (443), the first multiple V-belt pulley (441) is coaxially arranged at the output end of the driving assembly (43), the second multiple V-belt pulley (442) is coaxially arranged at the rotating shaft (421), the multiple V-belt (443) is sleeved on the outside of the first multiple V-belt pulley (441) and the second multiple V-belt pulley (442), and the first multiple V-belt pulley (441) and the second multiple V-belt pulley (442) are respectively engaged in the inside of the multiple V-belt (443).

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