Cutting device
By designing a cutting device with support platform, clamping mechanism and vertical cutting mechanism with multiple processing positions, the tear and edge collapse problems caused by shape differences during the cutting process of the cuboid silicon block is solved, and efficient continuous processing and improvement of yield is achieved.
Patent Information
- Application Number
- CN202420794812.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-17
- Publication Date
- 2025-06-03
- Estimated Expiration
- 2034-04-17
AI Technical Summary
In the prior art, during the cutting process, the cuboid silicon block has a large difference in shape behind the ear removal, which leads to uneven concave and convexity in the vertical plane direction and incomplete contact with the cutter workbench, resulting in abnormal tearing and edge collapse of the silicon block.
A cutting device is designed, including a support platform, a clamping mechanism and a cutting mechanism. The support platform has multiple processing positions, and the clamping mechanism is used to clamp the part to be processed, and the cutting mechanism cuts the part to be processed in the height direction of the support platform. This vertical cutting method can effectively reduce edge collapse.
Through the design of multiple processing positions, continuous processing and efficient loading and unloading are achieved. The clamping mechanism ensures the stability of the parts to be processed. The vertical cutting method significantly reduces edge collapse and improves the yield rate.
Smart Images

Figure CN222933077U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of photovoltaic modules, and in particular to a cutting device. Background Art
[0002] In the prior art, cuboid silicon blocks are bonded one by one under the action of stick glue, and finally a whole stack of cuboid silicon blocks is obtained. The whole stack of cuboid silicon blocks is placed horizontally on a truncation workbench in a horizontal state. The cutting tool holder of a truncator cuts the silicon blocks vertically downward in a single cutter head oblique cutting manner. After a single cutting is completed, the cutting tool holder is lifted vertically upward. After the cutting tool holder is lifted to the highest point, it moves to the uncut side and cuts again. Due to the large difference in the cuboid silicon blocks after ear removal, the cuboid silicon blocks are uneven in the vertical plane direction after bonding. After the whole stack of cuboid silicon blocks is transported to the truncator workbench, the cuboid silicon blocks do not fully contact the truncator workbench, resulting in the silicon blocks being torn due to their own excessive weight during cutting, thus causing abnormal edge chipping. Content of the Utility Model
[0003] The utility model aims to at least solve one of the technical problems existing in the prior art. For this purpose, an object of the utility model is to provide a cutting device, which can improve the processing efficiency of the cutting device and increase the finished product rate.
[0004] The cutting device according to an embodiment of the utility model includes: a support platform, a clamping mechanism and a cutting mechanism. The support platform has a plurality of processing positions, and the plurality of processing positions are adapted to place workpieces to be processed, and the plurality of processing positions are switchable; the clamping mechanism is adapted to clamp the workpiece to be processed; the cutting mechanism cuts the workpiece to be processed along the height direction of the support platform.
[0005] For the cutting device according to an embodiment of the utility model, the support platform has a plurality of processing positions, enabling the cutting device to perform continuous processing in an uninterrupted production process. The switchability of the plurality of processing positions facilitates the loading of workpieces to be processed and the unloading of workpieces to be processed after cutting, significantly improving the efficiency of the cutting device. The clamping mechanism can keep the workpiece to be processed stable during cutting, reducing processing errors caused by the movement of the workpiece to be processed, so as to improve product quality. The vertical cutting method adopted by the cutting mechanism can effectively reduce the proportion of edge chipping of the workpiece to be processed after cutting, and increase the finished product rate.
[0006] In some embodiments, the plurality of processing positions include: a first processing position and a second processing position. The first processing position and the second processing position are respectively located at both ends of the support platform, and the first processing position and the second processing position are switchable.
[0007] In some embodiments, there are a plurality of clamping mechanisms, and the plurality of clamping mechanisms are respectively arranged at a plurality of the processing positions, and each clamping mechanism can move relative to the corresponding processing position.
[0008] In some embodiments, the clamping mechanism includes: a first clamping member and a second clamping member. The first clamping member and the second clamping member are respectively arranged on two sides of the workpiece to be processed in a first direction. The first clamping member and the second clamping member have a clamping position for clamping the workpiece to be processed and a release position for releasing the workpiece to be processed along the first direction, and the first clamping member and the second clamping member are movable between the clamping position and the release position.
[0009] In some embodiments, both the first clamping member and the second clamping member are plural, and the plural first clamping members and the second clamping members are respectively arranged at intervals along a second direction of the workpiece to be processed, and the first direction is perpendicular to the second direction.
[0010] In some embodiments, it further includes: a boss, the boss is arranged on the support platform, the boss faces the workpiece to be processed, and the workpiece to be processed is arranged on the boss.
[0011] In some embodiments, the cutting mechanism includes a plurality of cutting lines; a plurality of grooves are formed on a surface of the boss facing the workpiece to be processed, and the plurality of grooves are respectively opposite to the plurality of cutting lines.
[0012] In some embodiments, the grooves penetrate through the boss along the second direction of the workpiece to be processed.
[0013] In some embodiments, the workpiece to be processed includes: a plurality of sub-workpieces, and the plurality of sub-workpieces are arranged along the height direction of the support platform.
[0014] In some embodiments, it further includes: a driving mechanism, the driving mechanism is connected to the support platform, and the driving mechanism drives the support platform to rotate.
[0015] Additional aspects and advantages of the present utility model will be given in part in the following description, will become apparent in part from the following description, or will be understood through the practice of the present utility model. Description of the Drawings
[0016] The above and / or additional aspects and advantages of the present utility model will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, wherein:
[0017] Figure 1 is a schematic diagram of a cutting device according to an embodiment of the present utility model.
[0018] Figure 2Schematic diagram of the first clamping part according to an embodiment of the present utility model.
[0019] Reference numerals:
[0020] 100, cutting device;
[0021] 10, support platform; 11, processing position; 12, first processing position; 13, second processing position;
[0022] 20, clamping mechanism; 21, first clamping member; 22, second clamping member; 23, clamping part;
[0023] 30, cutting mechanism; 31, cutting wire;
[0024] 40, workpiece to be processed;
[0025] A, height direction; B, length direction; C, width direction. Detailed implementation manners
[0026] The embodiments of the present utility model will be described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Below, reference is made to Figure 1 - Figure 2 Describe the cutting device 100 according to an embodiment of the present utility model, including: a support platform 10, a clamping mechanism 20, and a cutting mechanism 30. The support platform 10 has a height direction A, a length direction B, and a width direction C.
[0027] Specifically, as Figure 1 - Figure 2 shown, the support platform 10 has a plurality of processing positions 11, the plurality of processing positions 11 are adapted to place the workpiece to be processed 40, and the plurality of processing positions 11 can be switched; the clamping mechanism 20 is adapted to clamp the workpiece to be processed 40; the cutting mechanism 30 cuts the workpiece to be processed 40 along the height direction A of the support platform 10.
[0028] Combined with Figure 1, the support platform 10 provides a placement and processing space for the workpiece to be processed 40, and multiple processing positions 11 can accommodate multiple workpieces to be processed 40. During the production process of silicon rods, there will be multiple edge skin materials with arc-shaped parts at the top and irregular parts on both sides. After preliminary processing of the edge skin to remove the arc-shaped parts at the top and the irregular parts on both sides, regular cuboid silicon blocks are obtained. Multiple cuboid silicon blocks are bonded and cured to be spliced into a larger silicon block, which is the workpiece to be processed 40 in this embodiment. The clamping mechanism 20 is arranged on the support platform 10 to clamp the workpiece to be processed 40 so that the workpiece to be processed 40 is fixed at the processing position 11. The cutting process adopts a vertical cutting method. The cutting mechanism 30 can perform circular motion. The cutting mechanism 30 moves downward along the height direction A of the support platform 10 to cut the workpiece to be processed 40. After one cutting is completed, the cutting mechanism 30 rises along the height direction A of the support platform 10 back to the initial position, and then descends again for cutting to complete the cutting of multiple workpieces to be processed 40.
[0029] According to the cutting device 100 of the embodiment of the present invention, the support platform 10 has multiple processing positions 11, enabling the cutting device 100 to perform continuous processing in an uninterrupted production process. The multiple processing positions 11 are switchable to facilitate the loading of the workpiece to be processed 40 and the unloading of the workpiece to be processed 40 after cutting, significantly improving the efficiency of the cutting device 100. The clamping mechanism 20 can keep the workpiece to be processed 40 stable during the cutting process, reducing the processing error caused by the movement of the workpiece to be processed 40 to improve the product quality. The vertical cutting method adopted by the cutting mechanism 30 can effectively reduce the proportion of chipping of the workpiece to be processed 40 after cutting and improve the finished product rate.
[0030] According to some embodiments of the present invention, as Figure 1 shown, the multiple processing positions 11 include: a first processing position 12 and a second processing position 13. The first processing position 12 and the second processing position 13 are respectively located at both ends of the support platform 10, and can be switched between the first processing position 12 and the second processing position 13.
[0031] The first processing position 12 and the second processing position 13 are respectively located at both ends of the support platform 10 along the length direction B. The support platform 10 can rotate around the center of the line connecting the first processing position 12 and the second processing position 13 to realize the switching between the first processing position 12 and the second processing position 13, and then move the workpiece to be processed 40 from one processing position 11 to another processing position 11. The first processing position 12 is used for cutting the workpiece to be processed 40, and the second processing position 13 is used for loading and unloading the workpiece to be processed 40. The cutting mechanism 30 is located above the first processing position 12 along the height direction A of the support platform 10.
[0032] Thus, the first processing position 12 and the second processing position 13 are respectively located at both ends of the support platform 10. Such a layout design makes the two processing positions 11 physically independent of each other, avoiding mutual interference during the processing, and is conducive to simultaneously or alternately performing different processing tasks. The switchability between the first processing position 12 and the second processing position 13 enables the loading and unloading steps and the cutting steps of the workpiece 40 to be carried out simultaneously, realizing the efficient and continuous processing of the workpiece 40, improving the working efficiency of the cutting device 100, and at the same time maintaining the simple structure and operation convenience of the cutting device 100.
[0033] According to some embodiments of the present invention, as Figure 1 shown, there are multiple clamping mechanisms 20, and the multiple clamping mechanisms 20 are respectively arranged at multiple processing positions 11, and each clamping mechanism 20 can move relative to the corresponding processing position 11.
[0034] Multiple clamping mechanisms 20 are provided on both the first processing position 12 and the second processing position 13. Each clamping mechanism 20 can move relative to the corresponding processing position 11 along the width direction C of the support platform 10, and the multiple clamping mechanisms 20 are arranged at intervals along the length direction B of the support platform 10.
[0035] Thus, the multiple clamping mechanisms 20 respectively arranged at multiple processing positions 11 can ensure that the workpiece 40 can be accurately and stably clamped at multiple processing positions 11, so as to improve the processing accuracy and processing efficiency of the cutting device 100 for the workpiece 40. Each clamping mechanism 20 can move relative to the corresponding processing position 11 to facilitate the clamping and relaxation of the workpiece 40 by the clamping mechanism 20, facilitate the loading and unloading of the workpiece 40 at the processing position 11, and also facilitate the clamping mechanism 20 to be provided with workpieces 40 of various different sizes, improving the versatility of the cutting device 100.
[0036] According to some embodiments of the present invention, as Figure 1 and Figure 2 shown, the clamping mechanism 20 includes: a first clamping member 21 and a second clamping member 22. The first clamping member 21 and the second clamping member 22 are respectively arranged on both sides of the workpiece 40 in the first direction. The first clamping member 21 and the second clamping member 22 have a clamping position for clamping the workpiece 40 and a release position for releasing the workpiece 40 along the first direction, and the first clamping member 21 and the second clamping member 22 can move between the clamping position and the release position.
[0037] The first direction of the workpiece 40 to be processed is the same as the width direction C of the support platform 10. The first clamping member 21 and the second clamping member 22 are opposite to each other along the first direction of the workpiece 40. The workpiece 40 is located between the first clamping member 21 and the second clamping member 22. The first clamping member 21 and the second clamping member 22 can move relative to the workpiece 40 along the first direction of the workpiece 40 towards each other or away from each other. A plurality of clamping portions 23 are formed on the opposite side surfaces of the first clamping member and the second clamping member. The plurality of clamping portions 23 are arranged at intervals along the height direction A of the clamping mechanism 20.
[0038] When the first clamping member 21 and the second clamping member 22 are in the clamping position, that is, when the first clamping member 21 and the second clamping member 22 are close to each other, the clamping portions 23 on the first clamping member 21 and the second clamping member 22 respectively contact the two side surfaces of the workpiece 40 along the first direction and clamp and fix the workpiece 40, so as to facilitate the clamping and processing of the workpiece 40. When the first clamping member 21 and the second clamping member 22 are in the release position, that is, when the first clamping member 21 and the second clamping member 22 are away from each other, the first clamping member 21 and the second clamping member 22 are separated from the workpiece 40, so as to facilitate the loading and unloading of the workpiece 40.
[0039] Thus, the first clamping member 21 and the second clamping member 22 are respectively arranged on both sides of the workpiece 40 in the first direction, and can move between the clamping position and the release position, realizing the bilateral clamping and flexible release of the workpiece 40, and ensuring the stability of the workpiece 40 during the cutting process and the efficient operation of the equipment.
[0040] According to some embodiments of the present invention, as Figure 1 shown, both the first clamping member 21 and the second clamping member 22 are multiple. The multiple first clamping members 21 and the second clamping members 22 are respectively arranged at intervals along the second direction of the workpiece 40. The first direction is perpendicular to the second direction.
[0041] The second direction of the workpiece 40 is the same as the length direction B of the support platform 10. The workpiece 40 extends along the second direction. That is, the multiple first clamping members 21 and the second clamping members 22 are respectively arranged on both sides of the workpiece 40 along the first direction and are arranged at intervals along the second direction of the workpiece 40.
[0042] Thus, the clamping mechanism 20 is composed of the first clamping member 21 and the second clamping member 22. The multiple first clamping members 21 and the second clamping members 22 can provide omnidirectional clamping for the workpiece 40, provide a strong and uniform fixing force for the workpiece 40, ensure the stability of the workpiece 40 during the cutting process, realize the high-precision processing of the workpiece 40 by the cutting device 100, and improve the reliability and stability of the cutting device 100.
[0043] According to some embodiments of the present utility model, as Figure 1 shown, it further includes: a boss, the boss is arranged on the support platform 10, the boss is opposite to the workpiece to be processed 40, and the workpiece to be processed 40 is arranged on the boss.
[0044] The workpiece to be processed 40 is placed on the boss, the boss extends along the length direction B of the support platform 10, the boss is formed by a part of the surface of the support platform 10 protruding along the height direction A, and the lower end of the workpiece to be processed 40 along the height direction A of the support platform 10 is opposite to the boss.
[0045] Thus, the boss is arranged on the support platform 10 opposite to the workpiece to be processed 40, and the workpiece to be processed 40 is directly placed on the boss, which can improve the support stability of the workpiece to be processed during the processing and is also convenient for positioning when the workpiece to be processed 40 is loaded.
[0046] According to some embodiments of the present utility model, as Figure 1 shown, the cutting mechanism 30 includes a plurality of cutting wires 31; a plurality of grooves are formed on the surface of the boss facing the workpiece to be processed 40, and the plurality of grooves are respectively opposite to the plurality of cutting wires 31.
[0047] The plurality of cutting wires 31 extend along the width direction C of the support platform 10, the plurality of cutting wires 31 are arranged at intervals along the length direction B of the support platform 10, the spacing length between adjacent cutting wires 31 is L, and the value range of L is: 182 mm ≤ L ≤ 230 mm. The plurality of grooves are arranged at intervals along the length direction B of the support platform 10 on the surface of the boss, and the plurality of grooves are formed by a part of the surface of the boss concave along the height direction A of the support platform 10. The plurality of grooves and the plurality of cutting wires 31 correspond to each other along the height direction A of the support platform 10. The grooves are formed between adjacent two clamping mechanisms 20 to prevent interference between the cutting wires 31 and the clamping mechanisms 20 when the cutting mechanism 30 cuts the workpiece to be processed 40.
[0048] Thus, the cutting mechanism 30 includes a plurality of cutting wires 31, and the simultaneous operation of the plurality of cutting wires 31 can effectively improve the cutting efficiency of the cutting mechanism 30 and is suitable for large-batch and high-efficiency cutting tasks. Grooves are formed on the boss to facilitate cooperation with the cutting wires 31. When the cutting wires 31 cut the workpiece to be processed 40 to the bottom, there is still a certain gap between the cutting wires 31 and the boss, which can avoid direct contact between the cutting wires 31 and the boss, reduce the wear of the cutting wires 31, and can also protect the surface of the support platform 10 and extend the service life of the cutting wires 31 and the support platform 10.
[0049] According to some embodiments of the present utility model, as Figure 1 shown, the grooves penetrate through the boss along the second direction of the workpiece to be processed 40.
[0050] The groove penetrates through the boss along the second direction of the workpiece 40 to facilitate cooperation with the cutting wire 31, prevent the cutting wire 31 from contacting the boss, enable the cutting wire 31 to completely cut the workpiece 40, reduce the wear of the cutting wire 31, and extend the service life of the cutting wire 31.
[0051] According to some embodiments of the present invention, as Figure 1 shown, the workpiece 40 includes: a plurality of sub-workpieces, and the plurality of sub-workpieces are arranged along the height direction A of the support platform 10. In some embodiments, the workpiece 40 is a silicon block, and the plurality of sub-workpieces are regular cuboid silicon blocks obtained by preliminary processing of the opposite side skins. The plurality of cuboid silicon blocks are bonded and cured to be spliced into a larger silicon block, that is, the workpiece 40 in this embodiment. The plurality of sub-workpieces are stacked and bonded in sequence along the height direction A of the support platform 10, and the length of the workpiece 40 in the height direction A is 200 mm - 450 mm.
[0052] Thus, the design of arranging the plurality of sub-workpieces along the height direction A of the support platform 10 can achieve effective utilization of space and batch processing, enable the plurality of sub-workpieces to be processed simultaneously as a whole, is beneficial to improving the processing efficiency and consistency after cutting, and thus improves the production efficiency of the cutting device 100.
[0053] According to some embodiments of the present invention, it further includes: a driving mechanism, the driving mechanism is connected to the support platform 10, and the driving mechanism drives the support platform 10 to rotate. The driving mechanism is used to provide power and control movement. The driving mechanism can establish a connection with the support platform 10 through mechanical connection, electrical connection, etc., and can directly or indirectly apply force and movement to the support platform 10. This connection method ensures that the driving mechanism can effectively drive the support platform 10 to rotate to move the position of the workpiece 40 on the support platform 10.
[0054] Thus, the driving mechanism can effectively drive the movement of the support platform 10 to realize the position movement of the workpiece 40 on the support platform 10. The driving mechanism drives the support platform 10 to rotate so that the workpiece 40 can automatically change the processing position 11 without manual intervention, improves the automation degree and processing flexibility of the cutting device 100, reduces the time of manual operation and adjustment, and improves the production efficiency.
[0055] Combined with Figure 1, specifically, when the cutting device 100 is in the initial state, an uncut workpiece 40 to be processed is placed at the second processing position 13 by a worker or a manipulator to complete the loading step. The support platform 10 rotates 180° around the center of the line connecting the first processing position 12 and the second processing position 13, so that the end of the support platform 10 on which the workpiece 40 to be processed is placed moves to the first processing position 12, and the cutting mechanism 30 cuts the workpiece 40 to be processed. At the same time, a workpiece 40 to be processed is replenished at the vacant second processing position 13. Then, the support platform 10 rotates 180° again around the center of the line connecting the first processing position 12 and the second processing position 13, so that the processed workpiece 40 after cutting moves to the second processing position 13, and the processed workpiece 40 after cutting is placed at the second processing position 13 and taken off by a worker or a manipulator to complete the unloading. In this way, a working process can be completed. The replenished workpiece 40 then moves to the first processing position 12 for cutting, and by repeating this process continuously, continuous processing of the workpiece 40 by the cutting device 100 can be achieved.
[0056] The cutting device 100 according to the embodiment of the present invention can effectively improve the cutting efficiency of the workpiece 40 to be processed, achieve high-efficiency continuous processing, improve the working efficiency of the cutting device 100 on the premise of keeping the structure of the cutting device 100 simple and the operation convenient, and at the same time reduce the possible edge chipping phenomenon during the cutting of the workpiece 40 to be processed and reduce the raw material loss of the workpiece 40 to be processed.
[0057] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.
[0058] In the description of the present invention, the "first feature" and "second feature" may include one or more of such features. In the description of the present invention, the meaning of "a plurality" is two or more. In the description of the present invention, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through other features therebetween. In the description of the present invention, the first feature being "above", "above" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature is at a higher horizontal height than the second feature.
[0059] In the description of this specification, the descriptions with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.
[0060] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present utility model, and the scope of the present utility model is defined by the claims and their equivalents.
Claims
1. A cutting device, characterized in that: include: A supporting platform, wherein the supporting platform has a plurality of processing positions, wherein the plurality of processing positions are suitable for placing workpieces to be processed, and the plurality of processing positions are switchable; A clamping mechanism, wherein the clamping mechanism is suitable for clamping the workpiece to be processed; A cutting mechanism is used to cut the workpiece to be processed along the height direction of the supporting platform.
2. The cutting device according to claim 1, characterized in that The plurality of processing positions include: a first processing position and a second processing position, wherein the first processing position and the second processing position are respectively located at two ends of the support platform, and the first processing position and the second processing position are switchable.
3. The cutting device according to claim 1, characterized in that: There are multiple clamping mechanisms, and the multiple clamping mechanisms are respectively arranged at multiple processing positions, and each of the clamping mechanisms can move relative to the corresponding processing position.
4. The cutting device according to claim 3, characterized in that: The clamping mechanism comprises: a first clamping member; a second clamping member, wherein the first clamping member and the second clamping member are respectively arranged on both sides of the workpiece to be processed in a first direction, The first clamping member and the second clamping member have a clamping position for clamping the workpiece to be processed and a releasing position for releasing the workpiece to be processed along the first direction, and the first clamping member and the second clamping member are movable between the clamping position and the releasing position.
5. The cutting device according to claim 4, characterized in that There are a plurality of the first clamping members and a plurality of the second clamping members, and the plurality of the first clamping members and the second clamping members are respectively arranged at intervals along a second direction of the workpiece to be processed, and the first direction is perpendicular to the second direction.
6. The cutting device according to claim 1, characterized in that: Also includes: A boss is arranged on the supporting platform, the boss is opposite to the workpiece to be processed, and the workpiece to be processed is arranged on the boss.
7. The cutting device according to claim 6, characterized in that The cutting mechanism includes a plurality of cutting lines; A plurality of grooves are formed on a surface of the boss facing the workpiece to be processed, and the plurality of grooves are respectively opposite to the plurality of cutting lines.
8. The cutting device according to claim 7, characterized in that The groove penetrates the boss along the second direction of the workpiece to be processed.
9. The cutting device according to claim 1, characterized in that: The workpiece to be processed includes: a plurality of sub-processing parts, and the plurality of sub-processing parts are arranged along the height direction of the supporting platform.
10. The cutting device according to any one of claims 1 to 9, characterized in that: Also includes: A driving mechanism is connected to the supporting platform, and the driving mechanism drives the supporting platform to rotate.