An asymmetric ferrule blank forming device

Abstract

The application relates to a forming device, in particular to an asymmetric ring blank forming device, which comprises a device support, a cutting mechanism is fixedly connected to the device support, a clamping mechanism is slidably connected to the device support, the clamping mechanism can clamp an inner bearing ring or an outer bearing ring, the cutting mechanism and the clamping mechanism cooperatively move to cut the outer ring of the inner bearing ring, and the cutting mechanism and the clamping mechanism cooperatively move to cut the inner ring of the outer bearing ring; the inner bearing ring and the outer bearing ring of the asymmetric bearing ring can be machined and formed.

Description

Technical Field

[0001] This invention relates to forming apparatus, and more specifically to an asymmetric ring blank forming apparatus. Background Technology

[0002] In the bearing manufacturing industry, bearing rings, including the inner and outer rings, are core components, and their forming process directly affects the bearing's precision, strength, and service life. Traditional bearing ring blank forming technology mainly targets symmetrical ring designs, employing processes such as turning, forging, or cold rolling. However, with the continuous improvement of bearing performance requirements in industrial equipment, the demand for asymmetrical bearing rings is increasing, such as rings with irregular grooves, non-uniform wall thickness, or locally reinforced structures. Therefore, there is an urgent need for a dedicated asymmetrical bearing ring blank forming device that can efficiently and accurately form the inner and outer ring blanks simultaneously, and solve the process challenges brought about by asymmetrical structures. Summary of the Invention

[0003] The purpose of this invention is to provide an asymmetric bearing ring blank forming device, which can process and form inner bearing rings and outer bearing rings of asymmetric bearing rings.

[0004] The objective of this invention is achieved through the following technical solution:

[0005] An asymmetric bearing ring blank forming device includes a device support, a cutting mechanism fixedly connected to the device support, and a clamping mechanism slidably connected to the device support. The clamping mechanism can clamp an inner bearing ring or an outer bearing ring. The cutting mechanism and the clamping mechanism cooperate to cut the outer ring of the inner bearing ring, and the cutting mechanism and the clamping mechanism cooperate to cut the inner ring of the outer bearing ring.

[0006] The device support is fixedly connected to a slide rail, the device support is rotatably connected to a lead screw, and the device support is fixedly connected to a transmission bracket I.

[0007] The cutting mechanism includes a cutting bracket, which is fixedly connected to the device bracket. A support ring I is fixedly connected to the cutting bracket. A sliding support plate I is fixedly connected to the support ring I. Multiple tool holders are slidably connected to the sliding support plate I. Each tool holder has a cutting tool fixedly connected to its upper and lower ends. A threaded plate I is rotatably connected to the support ring I. The tool holders are threadedly connected to the threaded plate I. A transmission bracket II is fixedly connected to the cutting bracket.

[0008] The clamping mechanism includes a movable seat, which is slidably connected to a slide rail and threadedly connected to a lead screw. A support ring II is fixedly connected to the movable seat, a rotating cylinder is rotatably connected to the support ring II, a sliding support plate II is fixedly connected to the rotating cylinder, a plurality of clamping seats are slidably connected to the sliding support plate II, and a threaded plate II is rotatably connected to the rotating cylinder. The clamping seats are threadedly connected to the threaded plate II.

[0009] A power mechanism for driving the rotating cylinder to rotate is fixedly connected to the support ring II;

[0010] Multiple clamping seats clamp the inner ring of the inner bearing race, and multiple clamping seats clamp the outer ring of the outer bearing race.

[0011] A conical friction wheel I is rotatably connected to the transmission bracket II, and a drive motor for driving the conical friction wheel I to rotate is fixedly connected to the transmission bracket II. An adjustment motor I for driving the threaded disc I to rotate is fixedly connected to the conical friction wheel I.

[0012] A conical friction wheel II is rotatably connected to the transmission bracket I, and an adjustment motor II for rotating the drive screw is fixedly connected to the conical friction wheel II;

[0013] The conical friction wheel I and the conical friction wheel II are connected by a transmission belt. The conical friction wheel I and the conical friction wheel II have the same taper. A pulling mechanism that drives the transmission belt to move between the conical friction wheel I and the conical friction wheel II is fixedly connected to the cutting bracket.

[0014] The pulling mechanism includes a telescopic mechanism and a pulling bracket fixedly connected to the telescopic end of the telescopic mechanism. The telescopic mechanism is fixedly connected to the cutting bracket, and the transmission belt passes through the pulling bracket. Attached Figure Description

[0015] The present invention will now be described in further detail with reference to the accompanying drawings and specific implementation methods.

[0016] Figure 1 This is a schematic diagram of the bearing ring structure of the present invention;

[0017] Figure 2 This is a cross-sectional view of the bearing ring of the present invention;

[0018] Figure 3 This is a schematic diagram of the asymmetric ring blank forming device of the present invention;

[0019] Figure 4 This is a side view of the asymmetric ring blank forming device of the present invention;

[0020] Figure 5 This is a schematic diagram of the device support structure of the present invention;

[0021] Figure 6 This is a schematic diagram of the clamping mechanism structure of the present invention;

[0022] Figure 7 This is a schematic diagram of the clamping mechanism structure of the present invention;

[0023] Figure 8 This is a schematic diagram of the cutting mechanism structure of the present invention;

[0024] Figure 9 This is a schematic diagram of the tensioning mechanism of the present invention;

[0025] Figure 10 This is a side view of the pulling mechanism of the present invention.

[0026] In the diagram: Inner bearing ring 1; Outer bearing ring 2; Device bracket 3; Slide rail 31; Lead screw 32; Transmission bracket I 33; Cutting mechanism 4; Cutting bracket 41; Support ring I 42; Sliding support plate I 43; Tool holder 44; Cutting tool 45; Threaded disc I 46; Transmission bracket II 47; Clamping mechanism 5; Moving seat 51; Support ring II 52; Rotating cylinder 53; Sliding support plate II 54; Clamping seat 55; Threaded disc II 56; Conical friction wheel I 6; Drive motor 61; Adjusting motor I 62; Conical friction wheel II 7; Adjusting motor II 71; Pulling mechanism 8; Telescopic mechanism 81; Pulling bracket 82. Detailed Implementation

[0027] The present invention will now be described in further detail with reference to the accompanying drawings.

[0028] like Figures 1 to 2 The diagram shows the structure of an asymmetric bearing ring, where the outer ring of the inner bearing ring 1 has a similar arc shape and the inner ring of the outer bearing ring 2 has a similar arc shape. To facilitate the processing of the outer ring shape of the inner bearing ring 1 and the inner ring shape of the outer bearing ring 2, an asymmetric ring blank forming device was designed.

[0029] like Figures 3 to 10 The diagram shows the structure of an asymmetric ring blank forming device. The structure and function of the asymmetric ring blank forming device will be described in detail below.

[0030] An asymmetric bearing ring blank forming device includes a device support 3, a cutting mechanism 4 fixedly connected to the device support 3, and a clamping mechanism 5 slidably connected to the device support 3. The clamping mechanism 5 can clamp the inner bearing ring 1 or the outer bearing ring 2. The cutting mechanism 4 and the clamping mechanism 5 cooperate to cut the outer ring of the inner bearing ring 1, and the cutting mechanism 4 and the clamping mechanism 5 cooperate to cut the inner ring of the outer bearing ring 2.

[0031] When using, such as Figure 3As shown, the inner bearing ring 1 or the outer bearing ring 2 is placed on the clamping mechanism 5 for clamping, and the inner bearing ring 1 or the outer bearing ring 2 is driven to move closer to the cutting mechanism 4. The clamping mechanism 5 can drive the inner bearing ring 1 or the outer bearing ring 2 to rotate. The cutting mechanism 4 cuts the outer ring of the inner bearing ring 1 or the inner ring of the outer bearing ring 2, thereby forming an asymmetric ring blank.

[0032] like Figure 5 As shown below, the structure and function of the device support 3 and the cutting mechanism 4 will be described in detail.

[0033] The device support 3 is fixedly connected to a slide rail 31, the device support 3 is rotatably connected to a lead screw 32, and the device support 3 is fixedly connected to a transmission support I 33.

[0034] The cutting mechanism 4 includes a cutting bracket 41, which is fixedly connected to the device bracket 3. A support ring I 42 is fixedly connected to the cutting bracket 41, and a sliding support plate I 43 is fixedly connected to the support ring I 42. Multiple tool holders 44 are slidably connected to the sliding support plate I 43. The tool holders 44 are slidably connected to the support plate I 43 by means of sliders or the like. The support plate I 43 limits the tool holders 44, ensuring that the tool holders 44 can only slide on the support plate I 43 and cannot perform other movements on the support plate I 43. Each tool holder 44 has a cutting tool 45 fixedly connected to its upper and lower ends. A threaded plate I 46 is rotatably connected to the support ring I 42, and the tool holders 44 are threadedly connected to the threaded plate I 46. A transmission bracket II 47 is fixedly connected to the cutting bracket 41.

[0035] In use, when it is necessary to adjust the position of multiple tool holders 44, rotate the threaded disc I 46. When the threaded disc I 46 rotates, it drives the multiple tool holders 44 to move through the volute thread, so that the multiple tool holders 44 move closer or further away from each other. The tool holders 44 drive the cutting tools 45 to move, thereby adjusting the position of the cutting tools 45. The multiple cutting tools 45 located on the outer side are used to cut the inner ring of the outer bearing ring 2, and the multiple cutting tools 45 located on the inner side are used to cut the outer side of the inner bearing ring 1.

[0036] The threaded disc I 46 here is preferably a structure similar to the threaded disc in the chuck of the prior art, which has a one-way self-locking function and can effectively clamp; its specific structure is that the threaded disc I 46 is provided with a spiral thread, and the bottom of the corresponding tool holder 44 is provided with a thread that mates with the spiral thread, so that when the threaded disc I 46 rotates, the spiral thread pushes multiple tool holders 44 to move closer or further apart from each other.

[0037] The clamping mechanism 5 includes a movable seat 51, which is slidably connected to the slide rail 31 and threadedly connected to the lead screw 32. A support ring II 52 is fixedly connected to the movable seat 51, and a rotating cylinder 53 is rotatably connected to the support ring II 52. A sliding support plate II 54 is fixedly connected to the rotating cylinder 53, and multiple clamping seats 55 are slidably connected to the sliding support plate II 54. The clamping seats 55 are slidably connected to the support plate II 54 by means of sliders or the like. The support plate II 54 limits the clamping seats 55, ensuring that the clamping seats 55 can only slide on the support plate II 54 and cannot perform other movements on the support plate II 54. A threaded plate II 56 is rotatably connected to the rotating cylinder 53, and the clamping seats 55 are threadedly connected to the threaded plate II 56.

[0038] The threaded disc II 56 here is preferably a structure similar to the threaded disc in the chuck of the prior art, which has a one-way self-locking function and can effectively clamp; its specific structure is that the threaded disc II 56 is provided with a spiral thread, and the bottom of the corresponding clamping seat 55 is provided with a thread that mates with the spiral thread, so that when the threaded disc II 56 rotates, the spiral thread pushes multiple clamping seats 55 to move closer or further apart from each other.

[0039] A power mechanism for driving the rotating cylinder 53 to rotate is fixedly connected to the support ring II 52;

[0040] Multiple clamping seats 55 clamp the inner ring of the inner bearing ring 1, and multiple clamping seats 55 clamp the outer ring of the outer bearing ring 2.

[0041] The inner bearing ring 1 or outer bearing ring 2 to be clamped is placed on multiple clamping seats 55. When the inner bearing ring 1 needs to be clamped, the threaded disc II 56 is rotated. When the threaded disc II 56 rotates, it drives the multiple clamping seats 55 to move through the thread, so that the multiple clamping seats 55 move to the inside of the inner bearing ring 1 to clamp the inner ring of the inner bearing ring 1. When the outer bearing ring 2 needs to be clamped, the threaded disc II 56 is rotated. When the threaded disc II 56 rotates, it drives the multiple clamping seats 55 to move through the thread, so that the multiple clamping seats 55 move to the outside of the outer bearing ring 2 to clamp the outer ring of the outer bearing ring 2.

[0042] Start the power mechanism, preferably a servo motor. The output shaft of the power mechanism drives the rotating cylinder 53 to rotate, so that the rotating cylinder 53 drives the inner bearing ring 1 or the outer bearing ring 2 to rotate.

[0043] Rotating the lead screw 32 causes the moving seat 51 to move via the thread. The moving seat 51 causes the inner bearing ring 1 or the outer bearing ring 2 to move laterally. The lateral movement of the inner bearing ring 1 or the outer bearing ring 2, combined with the vertical movement of multiple cutting tools 45, completes the machining of the outer ring of the inner bearing ring 1 or the inner ring of the outer bearing ring 2, so that the outer ring of the inner bearing ring 1 is machined into a similar arc shape, and the inner ring of the outer bearing ring 2 is machined into a similar arc shape.

[0044] like Figure 9 and 10 As shown below, the following is a detailed explanation of how to automatically control the coordinated movement of the clamping mechanism 5 and the cutting mechanism 4 to process the inner bearing ring 1 or the outer bearing ring 2. Through the coordinated movement of the clamping mechanism 5 and the cutting mechanism 4, the arc of the outer ring of the inner bearing ring 1 and the arc of the inner ring of the outer bearing ring 2 are processed. Compared with controlling the movement of the clamping mechanism 5 and the cutting mechanism 4 separately, this processing method can correlate the movements of the clamping mechanism 5 and the cutting mechanism 4 to automatically process and form the arc.

[0045] A conical friction wheel I6 is rotatably connected to the transmission bracket II47. A drive motor 61 that drives the conical friction wheel I6 to rotate is fixedly connected to the transmission bracket II47. An adjustment motor I62 that drives the threaded disc I46 to rotate is fixedly connected to the conical friction wheel I6.

[0046] A conical friction wheel II7 is rotatably connected to the transmission bracket I33, and an adjustment motor II71 for rotating the drive screw 32 is fixedly connected to the conical friction wheel II7;

[0047] The conical friction wheel I6 and the conical friction wheel II7 are connected by a transmission belt. The conical friction wheel I6 and the conical friction wheel II7 have the same taper. A pulling mechanism 8 that drives the transmission belt to move between the conical friction wheel I6 and the conical friction wheel II7 is fixedly connected to the cutting bracket 41.

[0048] The pulling mechanism 8 includes a telescopic mechanism 81 and a pulling bracket 82 fixedly connected to the telescopic end of the telescopic mechanism 81. The telescopic mechanism 81 is fixedly connected to the cutting bracket 41, and the transmission belt passes through the pulling bracket 82.

[0049] In use, the position of the cutting tool 45 is adjusted in advance according to the processing requirements. The adjustment motor I 62 is started, and the output shaft of the adjustment motor I 62 drives the threaded disc I 46 to rotate. When the threaded disc I 46 rotates, it drives multiple cutting tools 45 to move through the thread, thereby adjusting the position of multiple cutting tools 45 so that the cutting tools 45 enter the processing position. The adjustment motor II 71 is started in advance, and the output shaft of the adjustment motor II 71 drives the lead screw 32 to rotate. When the lead screw 32 rotates, it drives the moving seat 51 to move through the thread. The moving seat 51 drives the inner bearing ring 1 or the outer bearing ring 2 to move laterally to the processing position.

[0050] The adjusting motors II 71 and I 62 are preferably servo motors. Both adjusting motors II 71 and I 62 are equipped with brakes. That is, when the output shafts of adjusting motors II 71 and I 62 are not rotating, there will be no rotation between the output shafts of adjusting motors II 71 and I 62 and the corresponding lead screw 32 and threaded disc I 46. That is, when adjusting motor II 71 rotates as a whole, it will drive the lead screw 32 to rotate, and when adjusting motor I 62 rotates as a whole, it will drive the threaded disc I 46 to rotate. The brakes here are devices used in the prior art to stop the output shaft of adjusting motor I 62. Due to the unidirectional transmission of the threaded disc I 46, the cutting force of the cutting tool 45 can be effectively prevented from being transmitted to the output shaft of adjusting motor I 62.

[0051] During cutting, the drive motor 61 is started. The drive motor 61 is preferably a servo motor. The output shaft of the drive motor 61 starts to rotate, which drives the conical friction wheel I6 to rotate. When the conical friction wheel I6 rotates, it drives the adjusting motor I62 to rotate. The adjusting motor I62 drives the threaded disc I46 to rotate. When the conical friction wheel I6 rotates, it drives the conical friction wheel II7 to rotate through the transmission belt. The conical friction wheel II7 drives the adjusting motor II71 to rotate. The adjusting motor II71 drives the lead screw 32 to rotate. That is, under the drive of the drive motor 61, the threaded disc I46 and the lead screw 32 will move synchronously.

[0052] The starting power mechanism is preferably a servo motor. The output shaft of the power mechanism drives the rotating cylinder 53 to rotate, so that the rotating cylinder 53 drives the inner bearing ring 1 or the outer bearing ring 2 to rotate.

[0053] like Figure 2As shown, the cutting process of the outer ring of the inner bearing race 1 is as follows: When the clamping mechanism 5 drives the inner bearing race 1 to move laterally, that is, when the inner bearing race 1 moves closer to the cutting mechanism 4, multiple cutting tools 45 move inward. During the lateral movement of the inner bearing race 1, the inward movement of the multiple cutting tools 45 increases. In order to make the inward movement of the multiple cutting tools 45 faster, that is, with the inward movement speed of the cutting tools 45 fixed, the rotation speed of the lead screw 32 is slowed down, thereby slowing down the speed at which the inner bearing race 1 moves closer to the cutting mechanism 4, thus forming an arc shape. At this time, the telescopic mechanism 81 needs to be activated to extend... The telescopic mechanism 81 can be a hydraulic cylinder or an electric push rod. The telescopic end of the telescopic mechanism 81 drives the pulling bracket 82 to move. The pulling bracket 82 drives the transmission belt to rotate, so that the pulling bracket 82 rotates between the conical friction wheel I6 and the conical friction wheel II7, changing the transmission ratio between the conical friction wheel I6 and the conical friction wheel II7. So that while the rotation speed of the conical friction wheel I6 remains constant, the rotation speed of the conical friction wheel II7 gradually slows down, which in turn makes the rotation speed of the lead screw 32 gradually slow down, the lateral movement speed of the inner bearing ring 1 gradually slows down, and the speed at which the cutting tool 45 moves inward remains constant, thus forming an outer ring formed by an arc.

[0054] Furthermore, as a further optimization of the previous embodiment, by activating the telescopic mechanism 81, the transmission ratio between the conical friction wheel I6 and the conical friction wheel II7 is gradually changed, and by controlling the speed of the telescopic end of the telescopic mechanism 81, the outer ring of the inner bearing ring 1 with different curvatures can be processed and formed according to different usage requirements.

[0055] like Figure 2As shown, the inner ring cutting process of the outer bearing race 2 is as follows: When the clamping mechanism 5 drives the outer bearing race 2 to move laterally, that is, when the outer bearing race 2 moves closer to the cutting mechanism 4, multiple cutting tools 45 move inward. During the lateral movement of the outer bearing race 2, the inward movement of the multiple cutting tools 45 increases. In order to make the inward movement of the multiple cutting tools 45 faster, that is, with the inward movement speed of the cutting tools 45 fixed, the rotation speed of the lead screw 32 is slowed down, thereby slowing down the speed at which the outer bearing race 2 moves closer to the cutting mechanism 4, thus forming an arc shape. At this time, the telescopic mechanism 81 needs to be activated to extend... The telescopic mechanism 81 can be a hydraulic cylinder or an electric push rod. The telescopic end of the telescopic mechanism 81 drives the pulling bracket 82 to move. The pulling bracket 82 drives the transmission belt to rotate, so that the pulling bracket 82 rotates between the conical friction wheel I6 and the conical friction wheel II7, changing the transmission ratio between the conical friction wheel I6 and the conical friction wheel II7. This causes the rotation speed of the conical friction wheel II7 to gradually decrease while the rotation speed of the conical friction wheel I6 remains constant. Consequently, the rotation speed of the lead screw 32 gradually decreases, the lateral movement speed of the outer bearing ring 2 gradually decreases, and the speed at which the cutting tool 45 moves inward remains constant, thus forming an inner ring with an arc.

[0056] Furthermore, as a further optimization of the previous embodiment, by activating the telescopic mechanism 81, the transmission ratio between the conical friction wheel I6 and the conical friction wheel II7 is gradually changed, and by controlling the speed of the telescopic end of the telescopic mechanism 81, the inner ring of the outer bearing ring 2 with different curvatures can be processed according to different usage requirements.

[0057] During the rotation of multiple cutting blades 45, the cutting force can be shared among multiple cutting blades 45, and the load can be shared by multiple cutting blades 45, reducing the force on a single cutting blade 45, reducing the wear of the cutting blade 45, extending the life of the cutting blade 45, and the multiple cutting blades 45 can make the cutting force distribution more uniform, which can reduce the risk of material deformation and improve the smoothness of the cut.

[0058] By distributing the cutting force among multiple cutting tools 45, the load can be reduced, thus reducing the power required by a single cutting tool 45, optimizing energy utilization, reducing tool changing frequency, and lowering maintenance costs. The multiple cutting tools 45 work together to balance vibration and reduce equipment shaking, making it particularly suitable for processing high-hardness or high-toughness materials.

[0059] Furthermore, multiple sets of tools in different positions can be installed on the tool holder 44, and multiple clamping seats 55 can clamp multiple inner bearing rings 1 or multiple outer bearing rings 2. Multiple sets of tools can simultaneously cut multiple inner bearing rings 1 or multiple outer bearing rings 2, which can improve processing efficiency compared to the single processing method in the prior art.

Claims

1. An asymmetric ring blank forming device, comprising a device support (3), characterized in that: A cutting mechanism (4) is fixedly connected to the device bracket (3), and a clamping mechanism (5) is slidably connected to the device bracket (3). The clamping mechanism (5) can clamp the inner bearing ring (1) or the outer bearing ring (2). The cutting mechanism (4) and the clamping mechanism (5) cooperate to cut the outer ring of the inner bearing ring (1), and the cutting mechanism (4) and the clamping mechanism (5) cooperate to cut the inner ring of the outer bearing ring (2). A slide rail (31) is fixedly connected to the device bracket (3), a lead screw (32) is rotatably connected to the device bracket (3), and a transmission bracket I (33) is fixedly connected to the device bracket (3). The cutting mechanism (4) includes a cutting bracket (41), which is fixedly connected to the device bracket (3). A support ring I (42) is fixedly connected to the cutting bracket (41). A sliding support plate I (43) is fixedly connected to the support ring I (42). Multiple tool holders (44) are slidably connected to the sliding support plate I (43). Each tool holder (44) has a cutting tool (45) fixedly connected to both its upper and lower ends. A threaded plate I (46) is rotatably connected to the support ring I (42). The tool holder (44) is threadedly connected to the threaded plate I (46). A transmission bracket II (47) is fixedly connected to the cutting bracket (41). The clamping mechanism (5) includes a movable seat (51), which is slidably connected to the slide rail (31). The movable seat (51) is threadedly connected to the lead screw (32). A support ring II (52) is fixedly connected to the movable seat (51). A rotating cylinder (53) is rotatably connected to the support ring II (52). A sliding support plate II (54) is fixedly connected to the rotating cylinder (53). Multiple clamping seats (55) are slidably connected to the sliding support plate II (54). A threaded plate II (56) is rotatably connected to the rotating cylinder (53). The clamping seat (55) is threadedly connected to the threaded plate II (56). A conical friction wheel I (6) is rotatably connected to the transmission bracket II (47), a drive motor (61) for driving the conical friction wheel I (6) to rotate is fixedly connected to the transmission bracket II (47), and an adjustment motor I (62) for driving the threaded disc I (46) to rotate is fixedly connected to the conical friction wheel I (6).

2. The asymmetric ring blank forming device according to claim 1, characterized in that: The support ring II (52) is fixedly connected to a power mechanism that drives the rotating cylinder (53) to rotate.

3. The asymmetric ring blank forming device according to claim 1, characterized in that: Multiple clamping seats (55) clamp the inner ring of the inner bearing ring (1) and multiple clamping seats (55) clamp the outer ring of the outer bearing ring (2).

4. The asymmetric ring blank forming device according to claim 1, characterized in that: A conical friction wheel II (7) is rotatably connected to the transmission bracket I (33), and an adjustment motor II (71) for rotating the drive screw (32) is fixedly connected to the conical friction wheel II (7).

5. The asymmetric ring blank forming device according to claim 4, characterized in that: The conical friction wheel I (6) and the conical friction wheel II (7) are connected by a transmission belt. The conical friction wheel I (6) and the conical friction wheel II (7) have the same taper. A pulling mechanism (8) that drives the transmission belt to move between the conical friction wheel I (6) and the conical friction wheel II (7) is fixedly connected to the cutting bracket (41).

6. The asymmetric ring blank forming device according to claim 5, characterized in that: The pulling mechanism (8) includes a telescopic mechanism (81) and a pulling bracket (82) fixedly connected to the telescopic end of the telescopic mechanism (81). The telescopic mechanism (81) is fixedly connected to the cutting bracket (41), and the transmission belt passes through the pulling bracket (82).

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