Positioning tool for drilling clutch housing

Abstract

The application provides a positioning tool for drilling clutch housings, comprising a drive shaft, a positioning assembly, a clamping assembly and a drilling assembly. The drive shaft has a first axis, and the positioning assembly can rotate around the first axis and is composed of a plurality of circumferentially distributed positioning units. The positioning units have axial positioning functions for pushing a workpiece to a preset position along the first axis and perpendicularity adjustment functions for adjusting the position of the workpiece in a direction perpendicular to the first axis after the pushing. The clamping assembly is arranged on the inner side of the positioning assembly and is used for fixing the workpiece. The drive shaft is provided with a position adjustment mechanism and has a first stroke and a second stroke. When in the first stroke, the positioning units position the workpiece, and the clamping assembly fixes the workpiece; when in the second stroke, the drilling assembly drills the workpiece. Therefore, the stability of the drilling process is enhanced, and the accuracy of the drilling position is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of positioning tooling, in particular to a positioning tooling for drilling a clutch housing. BACKGROUND

[0002] In modern manufacturing, motorcycles are an important means of transportation, and the processing quality of key components directly affects the performance and safety of the whole vehicle. The clutch, as the core component of the motorcycle transmission system, its housing processing precision is crucial. Especially in the drilling process, the accuracy and straightness of the hole position directly relate to the assembly precision and working stability of the clutch.

[0003] Traditional clutch housing processing methods often rely on manual operation, which not only is inefficient, but also is prone to positioning errors, leading to unstable processing quality; in addition, manual operation cannot guarantee the consistency of each processed part, often leading to hole deviation and inconsistent processing, thereby affecting the overall quality of the product and increasing the difficulty and uncertainty of subsequent assembly.

[0004] In recent years, with the development of mechanical automation technology, more and more manufacturing enterprises have begun to use mechanical drilling machines for processing production. These devices not only improve production efficiency, but also significantly improve processing precision and product quality. In the drilling of clutch housings, the use of mechanical drilling machines can effectively reduce human error, improve the accuracy and consistency of hole positions, and meet the requirements of high-precision processing.

[0005] However, existing mechanical drilling machines, while improving processing speed, have poor positioning accuracy and repeatability. Traditional mechanical equipment often lacks effective positioning devices, leading to the displacement of workpieces during clamping and positioning, especially in mass production, this error will accumulate, causing a large amount of waste and rework, increasing production costs. In addition, the traditional equipment has insufficient fixing ability for workpieces during operation, which can easily cause the workpieces to vibrate during processing, thereby affecting the accuracy of the hole position.

[0006] The existing automatic positioning tooling still has some deficiencies in design, for example, during workpiece positioning and clamping, the workpiece may be displaced or clamped insecurely due to unreasonable structure design.

[0007] The information disclosed in the background section of the present application is only intended to deepen the understanding of the general background of the present application, and should not be regarded as acknowledging or implying in any form that the information constitutes prior art known to those skilled in the art. SUMMARY

[0008] Based on this, it is necessary to provide a positioning tool for clutch housing drilling in view of the problems of workpiece deviation or clamping instability in the machining process of the mechanical drilling machine.

[0009] The above object is achieved by the following technical solutions:

[0010] A positioning tool for clutch housing drilling, comprising:

[0011] A drive shaft having a first axis;

[0012] A positioning assembly capable of rotating around the first axis, the positioning assembly comprising a plurality of positioning units distributed circumferentially around the first axis, the positioning units having axial positioning function and perpendicularity adjustment function; the axial positioning function is used to push the workpiece to a predetermined position along the first axis, and after the pushing is completed, the perpendicularity adjustment function is used to adjust the position of the workpiece in the direction perpendicular to the first axis;

[0013] A clamping assembly arranged on the inner side of the positioning assembly, the clamping assembly being used to fix the workpiece;

[0014] A drilling assembly for drilling the workpiece;

[0015] The drive shaft is provided with a position adjustment mechanism, the position adjustment mechanism has a first stroke and a second stroke, when the positioning unit is in the first stroke, the workpiece is positioned, and the clamping assembly is used to fix the workpiece; when the drilling assembly is in the second stroke, the workpiece is drilled.

[0016] In one embodiment, the positioning unit comprises a driving assembly and a positioning plate, the driving assembly is used to drive the positioning plate to rotate to push the workpiece to move along the first axis to a predetermined position.

[0017] In one embodiment, the positioning unit further comprises an anti-dropping structure, the anti-dropping structure is in sliding connection with the positioning plate, the driving assembly drives the anti-dropping structure to generate periodic vibration to adjust the position of the workpiece in the direction perpendicular to the first axis.

[0018] In one embodiment, further comprising a limiting structure, the limiting structure is arranged on the workpiece, and the limiting structure cooperates with the positioning plate to drive the workpiece to move.

[0019] In one embodiment, the positioning plate is provided with a relief hole, when the position adjustment mechanism is in the second stroke, the relief hole is aligned with the drilling path of the drilling assembly.

[0020] In one of the embodiments, the clamping assembly comprises a plurality of clamping racks distributed circumferentially around the first axis, and the clamping racks are movable in a direction perpendicular to the first axis to fix the workpiece.

[0021] In one of the embodiments, the clamping assembly further comprises a chuck, a ring gear and a cross gear, the ring gear is rotationally connected with the chuck, the ring gear is connected with the cross gear, and the cross gear is connected with the clamping racks.

[0022] In one of the embodiments, a limit block is arranged on the drive shaft, when the position adjusting mechanism is in the first stroke, the limit block is connected with the ring gear, and the drive shaft drives the ring gear to rotate to realize the movement of the clamping racks in the direction perpendicular to the first axis.

[0023] In one of the embodiments, a stop plate is further included, the stop plate is fixedly connected with the drive shaft, and the stop plate is used to limit the movement of the workpiece along the first axis.

[0024] In one of the embodiments, a driving mechanism and a transmission gear are further included, the driving mechanism is connected with the drive shaft through the transmission gear.

[0025] The present application has the following beneficial effects:

[0026] The present application provides a positioning tool for drilling clutch housing, which comprises a drive shaft, a positioning assembly, a clamping assembly and a drilling assembly. The drive shaft has a first axis, and the positioning assembly is rotationally movable around the first axis and is composed of a plurality of circumferentially distributed positioning units. The positioning unit has an axial positioning function and a perpendicularity adjusting function, wherein the axial positioning function is used to push the workpiece to a preset position along the first axis, and the perpendicularity adjusting function is used to adjust the position of the workpiece in the direction perpendicular to the first axis after the pushing. The clamping assembly is arranged on the inner side of the positioning assembly and is used to fix the workpiece. The drive shaft is provided with a position adjusting mechanism and has a first stroke and a second stroke. When the position adjusting mechanism is in the first stroke, the positioning unit positions the workpiece, and the clamping assembly fixes the workpiece. When the position adjusting mechanism is in the second stroke, the drilling assembly drills the workpiece. Therefore, the stability of the machining process is enhanced, and the accuracy of the drilling position is improved. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 The structure diagram of the positioning tool for drilling clutch housing provided by an embodiment of the present application is shown in the figure;

[0028] Figure 2 The structure diagram of the positioning tool for drilling clutch housing provided by an embodiment of the present application is shown in the figure; Figure 1 The side view of the positioning tool for drilling clutch housing in the present application is shown in the figure;

[0029] Figure 3 The structure diagram of the positioning tool for drilling clutch housing provided by an embodiment of the present application is shown in the figure;Figure 2 Positioning tool for drilling clutch housing along the section of A-A;

[0030] Figure 4 For Figure 2 Positioning tool for drilling clutch housing along the section of A-A;

[0031] Figure 5 For Figure 2 Structure diagram of workpiece in positioning tool for drilling clutch housing;

[0032] Figure 6 For Figure 2 Half sectional view of clamping assembly in positioning tool for drilling clutch housing;

[0033] Figure 7 For Figure 2 Half sectional view of positioning assembly in positioning tool for drilling clutch housing;

[0034] Figure 8 For Figure 7 Structure diagram of positioning unit in positioning tool for drilling clutch housing.

[0035] Wherein:

[0036] 100, workpiece; 101, limiting structure;

[0037] 200, rack; 210, power box; 211, driving mechanism; 212, transmission gear; 220, driving shaft; 221, position adjusting mechanism; 222, limiting block; 230, stop plate; 240, drilling assembly;

[0038] 300, positioning assembly; 301, ring sleeve; 310, positioning unit; 311, driving motor; 312, positioning gear; 313, positioning plate; 314, fixed support; 315, anti-dropping structure; 316, avoiding hole;

[0039] 400, clamping assembly; 401, chuck; 402, gear ring; 403, key groove; 404, cross-step gear; 405, clamping rack. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application is further described in detail below by examples and in conjunction with the drawings. It should be understood that the specific examples described herein are only used to explain the present application and do not limit the present application.

[0041] The serial numbers of components in the present application, such as "first", "second", etc., are only used to distinguish the described objects, and do not have any sequence or technical meaning. In the present application, unless otherwise specified, "connection" and "coupling" include direct and indirect connection (coupling). In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0042] In the present application, unless otherwise specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0043] Reference will now be made to the drawings Figures 1 to 8 The positioning tool for drilling clutch housing provided by the embodiment of the present application is described.

[0044] As Figures 1 to 8 shown, the positioning tool for drilling clutch housing provided by the embodiment of the present application is particularly suitable for positioning and drilling the housing of a motorcycle clutch, and of course it can also be applied to positioning and drilling under other working conditions. Specifically, the positioning tool for drilling clutch housing includes a rack 200, a power box 210 and a driving shaft 220. The rack 200 serves as the mounting basis for other parts including the power box 210 and the driving shaft 220. Other components can be directly or indirectly mounted on the rack 200 and form a relatively integral whole after installation. The power box 210 provides power for the rotation of the driving shaft 220, and the first axis is the central axis of the driving shaft 220.

[0045] As Figure 2As shown, the positioning assembly 300 is coaxially installed with the driving shaft 220 and can rotate around the first axis. The positioning assembly 300 comprises a plurality of positioning units 310 distributed around the first axis, and the positioning units 310 have axial positioning function and perpendicularity adjustment function. Specifically, first, the workpiece 100 is placed to the end of the driving shaft 220 away from the power box 210 by the conveying mechanism, ensuring that the initial position of the workpiece 100 matches the working range of the positioning assembly 300.

[0046] Before the drilling work starts, the positioning units 310 first push the workpiece 100 to move along the first axis in the direction close to the power box 210, i.e. the left direction in the figure, until the workpiece 100 reaches the preset position. During this process, the positioning units 310 gradually come into complete contact with the workpiece 100, ensuring the smooth movement of the workpiece 100. When the workpiece 100 reaches the preset position, the positioning units 310 drive the workpiece 100 to move in the direction perpendicular to the first axis, so as to adjust the position of the workpiece 100 on the driving shaft 220, ensuring that the workpiece 100 is placed perpendicular to the driving shaft 220, thereby ensuring the accurate positioning of the workpiece 100. Figure 3

[0047] The positioning tool for drilling clutch housing further comprises a clamping assembly 400 arranged on the inner side of the positioning assembly 300 for fixing the workpiece 100. Specifically, when the positioning units 310 push the workpiece 100 to the preset position, i.e. at the same horizontal plane with the clamping assembly 400, the clamping assembly 400 is located on the inner side of the workpiece 100 at this time. Then, the clamping assembly 400 fixes the workpiece 100, ensuring that the workpiece 100 remains stable during drilling, avoiding processing errors caused by vibration or movement.

[0048] In addition, as shown in the figure, the driving shaft 220 is provided with a position adjustment mechanism 221. Specifically, the position adjustment mechanism 221 divides the driving shaft 220 into a front section and a rear section, and the front section and the rear section are connected by sliding through the position adjustment mechanism 221. During the positioning and fixing of the workpiece 100, the position adjustment mechanism 221 is in the first stroke, i.e. the position adjustment mechanism 221 drives the rear section of the driving shaft 220 to slide to the left, i.e. the left and right direction in the figure, until the rear section of the driving shaft 220 and the front section of the driving shaft 220 are in contact. Then, after the positioning assembly 300 completes the positioning, the driving shaft 220 rotates to drive the clamping assembly 400 to fix the workpiece 100. Figure 3 Figure 3

[0049] Further, as shown in the figure, the driving shaft 220 is provided with a position adjustment mechanism 221. Specifically, the position adjustment mechanism 221 divides the driving shaft 220 into a front section and a rear section, and the front section and the rear section are connected by sliding through the position adjustment mechanism 221. During the positioning and fixing of the workpiece 100, the position adjustment mechanism 221 is in the first stroke, i.e. the position adjustment mechanism 221 drives the rear section of the driving shaft 220 to slide to the left, i.e. the left and right direction in the figure, until the rear section of the driving shaft 220 and the front section of the driving shaft 220 are in contact. Then, after the positioning assembly 300 completes the positioning, the driving shaft 220 rotates to drive the clamping assembly 400 to fix the workpiece 100. Figures 1 to 3 ​​​As shown, the positioning tool for drilling the clutch housing further comprises a drilling assembly 240 arranged on the frame 200. Specifically, after the workpiece 100 is positioned and fixed, the position adjusting mechanism 221 is in the second stroke, i.e. the rear driving shaft 220 is driven by the position adjusting mechanism 221 to slide to the right, i.e. in the left-right direction, the rear driving shaft 220 and the front driving shaft 220 gradually separate. At this time, the drilling assembly 240 is started to drill the workpiece 100. After the first drilling is completed, the workpiece 100, the clamping assembly 400 and the positioning assembly 300 are synchronously rotated by the driving shaft 220, so that the drilling assembly 240 can smoothly perform the next drilling operation, thereby realizing a continuous and efficient machining process. Figure 3

[0050] In one embodiment, as shown in Figure 8 , the positioning unit 310 comprises a driving assembly and a positioning plate 313. Specifically, the driving assembly comprises a driving motor 311 and a positioning gear 312, and the driving motor 311 is in meshing transmission with the positioning gear 312. In addition, the positioning unit 310 further comprises a fixing support 314, and the positioning gear 312 and the positioning plate 313 are connected through the fixing support 314.

[0051] In the positioning of the workpiece 100, the driving motor 311 is first started. When the workpiece 100 has not yet reached the preset position, the positioning plate 313 and the positioning gear 312 can be regarded as a whole because they are stably connected through the fixing support 314. Thus, after the driving motor 311 rotates, the positioning plate 313 is driven to rotate towards the workpiece 100 and gradually contacts the workpiece 100. Continuing to rotate the driving motor 311, the positioning plate 313 pushes the workpiece 100 to slide to the left, i.e. in the left-right direction, until the workpiece 100 reaches the preset position. Figure 3

[0052] Further, as shown in Figure 8 ​​As shown, the positioning unit 310 further comprises an anti-falling structure 315 which is in sliding connection with the positioning plate 313. Specifically, when the workpiece 100 reaches the preset position, the positioning plate 313 cannot continue to rotate. At this time, the positioning gear 312 is in gear engagement with the anti-falling structure 315. Therefore, the continuous rotation of the driving motor 311 drives the anti-falling structure 315 to move through the positioning gear 312. Since the anti-falling structure 315 is in sliding connection with the positioning plate 313 and an elastic member is arranged therebetween, the continuous rotation of the positioning gear 312 causes the anti-falling structure 315 to slide towards the positioning plate 313, and the elastic member is compressed. During the process that one tooth of the positioning gear 312 is in engagement with the anti-falling structure 315, the elastic member is continuously compressed; when the tooth is disengaged, the anti-falling structure 315 is automatically reset and engaged with the next tooth under the action of the elastic force. This process causes the anti-falling structure 315 to vibrate periodically, causing the anti-falling structure 315 to switch between pushing and resetting. Since the anti-falling structure 315 is connected with the positioning plate 313, the anti-falling structure 315 causes the positioning plate 313 to vibrate continuously in the process of being repeatedly pushed and reset, so that the workpiece 100 pushed by the positioning plate 313 vibrates, further adjusting the position of the workpiece 100, and ensuring that the workpiece 100 is perpendicular to the driving shaft 220.

[0053] It can be understood that, at the moment when the tooth of the positioning gear 312 is disengaged from the anti-falling structure 315, the torque received by the positioning plate 313 will temporarily decrease. However, since there is a large friction force between the positioning gear 312 and the fixed support 314, and the fixed support 314 is connected with the positioning plate 313, the torque of the positioning gear 312 on the positioning plate 313 will not completely disappear. This means that the force of the workpiece 100 pushed on the positioning plate 313 will not disappear, but will only decrease at the moment of disengagement, and will not affect the positioning accuracy of the workpiece 100.

[0054] Finally, when the workpiece 100 is positioned, the driving motor 311 is turned off.

[0055] In one embodiment, as shown in Figure 5 The workpiece 100 is provided with a limiting structure 101, and the number of the limiting structure 101 is consistent with the positioning unit 310. Specifically, the two sides of the positioning plate 313 are provided with smooth surfaces, and the positions correspond to the limiting structure 101 of the workpiece 100. In the process of pushing the workpiece 100 by the positioning plate 313, the smooth surfaces can smoothly enter the limiting structure 101, ensuring the accuracy of the position adjustment of the workpiece 100.

[0056] Further, as shown in Figure 4As shown, the positioning assembly 300 further comprises a ring 301, and the positioning unit 310 is arranged on the ring 301. The ring 301 is also used to protect the internal components of the positioning assembly 300 from being damaged during operation. At the same time, the ring 301 also plays a role in safety protection, effectively preventing potential harm to the operator.

[0057] In one embodiment, as shown in Figure 7 and Figure 8 The positioning plate 313 is provided with a clearance hole 316. Specifically, after the workpiece 100 is positioned and fixed, the clearance hole 316 is aligned with the drilling path of the drilling assembly 240 to form an unobstructed advancing path for the drilling assembly 240. At the same time, it ensures that the drilling assembly 240 moves along the predetermined trajectory during processing, avoiding interference with the positioning plate 313 and causing damage to the positioning plate 313.

[0058] In one embodiment, as shown in Figure 6 The clamping assembly 400 comprises a plurality of clamping racks 405 distributed circumferentially around the first axis.

[0059] Further, the clamping assembly 400 further comprises a chuck 401, a gear ring 402 and a cross-step gear 404. The gear ring 402 and the chuck 401 are rotationally connected, the gear ring 402 and the cross-step gear 404 are connected, the cross-step gear 404 is connected with the clamping rack 405, and the clamping rack 405 is slidingly connected with the chuck 401. It can be understood that the clamping rack 405, the gear ring 402 and the cross-step gear 404 are all arranged in the chuck 401.

[0060] In addition, as shown in Figure 3 The driving shaft 220 is further provided with a limiting block 222, and the limiting block 222 is fixedly connected with the rear driving shaft 220. Specifically, the position adjusting mechanism 221 drives the rear driving shaft 220 to slide to the left, i.e. the left-right direction in Figure 3 , until the rear driving shaft 220 and the front driving shaft 220 are in contact. During this process, as shown in Figure 3 and Figure 6As shown, the limit block 222 is synchronously slid to the left and matched with the keyway 403 of the gear ring 402. At this time, the driving shaft 220 drives the limit block 222 to rotate, so that the gear ring 402 also rotates, and then the clamping rack 405 is synchronously moved away from the driving shaft 220 until it contacts and fixes the workpiece 100. During the fixing stage of the workpiece 100, because the gear ring 402 is rotationally connected with the chuck 401, and the clamping rack 405 is slidably connected with the chuck 401, the chuck 401 does not rotate. However, after the fixing is completed, the position adjusting mechanism 221 drives the rear driving shaft 220 to slide to the right, so that the limit block 222 is matched and connected with the chuck 401, thereby driving the entire clamping assembly 400 to rotate. Because the clamping rack 405 has fixed the workpiece 100, the rotation of the clamping assembly 400 will make the workpiece 100 rotate, thereby realizing drilling at different positions.

[0061] In one of the embodiments, as shown in Figure 3 and Figure 4 shown, the positioning tool for drilling the clutch housing further comprises a stop plate 230, which is fixedly connected with the driving shaft 220. Specifically, the positioning plate 313 pushes the workpiece 100 to move along the first axis to the left, i.e., the left direction in Figure 3 , until the workpiece 100 abuts against the stop plate 230.

[0062] In one of the embodiments, as shown in Figure 4 , the positioning tool for drilling the clutch housing further comprises a driving mechanism 211 and a transmission gear 212, both of which are arranged inside the power box 210, and the driving mechanism 211 is connected with the driving shaft 220 through the transmission gear 212.

[0063] The technical features of the above embodiments can be combined in any manner. To make the description concise, all possible combinations of the technical features in the above embodiments are not described, but as long as the combinations of the technical features do not exist, they should be considered as the scope of the present disclosure.

[0064] The above embodiments only express several implementation manners of the present disclosure, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the present disclosure. It should be pointed out that, for those skilled in the art, some modifications and improvements can be made without departing from the concept of the present disclosure, and these all belong to the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be subject to the appended claims.

Claims

1. A positioning fixture for drilling a clutch housing, characterized in that, include: A drive shaft having a first axis; A positioning component is provided, which is rotatable around a first axis. The positioning component includes a plurality of positioning units circumferentially distributed around the first axis. Each positioning unit has an axial positioning function and a perpendicularity adjustment function. The axial positioning function is used to push the workpiece along the first axis to a preset position. After the pushing is completed, the perpendicularity adjustment function is used to adjust the position of the workpiece in a direction perpendicular to the first axis. A clamping assembly is disposed inside the positioning assembly and is used to fix the workpiece. Drilling assembly, used for drilling holes in workpieces; The drive shaft is provided with a position adjustment mechanism, which has a first stroke and a second stroke. When in the first stroke, the positioning unit positions the workpiece and the clamping assembly fixes the workpiece. When in the second stroke, the drilling assembly drills holes in the workpiece. The clamping assembly includes a plurality of clamping racks circumferentially distributed around the first axis, the clamping racks being movable in a direction perpendicular to the first axis to fix the workpiece; The clamping assembly further includes a chuck, a gear ring, and a stepped gear. The gear ring is rotatably connected to the chuck, the gear ring is connected to the stepped gear, and the stepped gear is connected to the clamping rack. A limit block is provided on the drive shaft. When the position adjustment mechanism is in the first stroke, the limit block is connected to the gear ring, and the drive shaft drives the gear ring to rotate so that the clamping rack moves in a direction perpendicular to the first axis.

2. The positioning fixture for drilling a clutch housing according to claim 1, characterized in that, The positioning unit includes a driving component and a positioning plate. The driving component is used to drive the positioning plate to rotate, so as to push the workpiece to move along the first axis to a preset position.

3. The positioning fixture for drilling a clutch housing according to claim 2, characterized in that, The positioning unit further includes an anti-detachment structure, which is slidably connected to the positioning plate. The driving component drives the anti-detachment structure to generate periodic vibrations to adjust the position of the workpiece in a direction perpendicular to the first axis.

4. The positioning fixture for drilling a clutch housing according to claim 3, characterized in that, It also includes a limiting structure, which is disposed on the workpiece and cooperates with the positioning plate to drive the workpiece to move.

5. The positioning fixture for drilling a clutch housing according to claim 4, characterized in that, The positioning plate is provided with a clearance hole. When the position adjustment mechanism is in the second stroke, the clearance hole is aligned with the drilling path of the drilling assembly.

6. The positioning fixture for drilling a clutch housing according to claim 1, characterized in that, It also includes a stop plate, which is fixedly connected to the drive shaft and is used to restrict the movement of the workpiece on the first axis.

7. The positioning fixture for drilling a clutch housing according to claim 1, characterized in that, It also includes a drive mechanism and a transmission gear, wherein the drive mechanism is connected to the drive shaft via the transmission gear.

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