Rolling mechanism with pre-bending function

Abstract

The utility model relates to the technical field of edge rolling mechanisms, in particular to an edge rolling mechanism with a pre-bending function, which comprises a feeding pinch roll component, a pre-bending component and an edge rolling component which are sequentially arranged along the advancing direction of a plate, the feeding clamping roller assembly is used for clamping and feeding a plate; the pre-bending assembly comprises a pre-bending lower pressing roller capable of vertically floating, a first pre-bending upper pressing roller and a second pre-bending upper pressing roller, wherein the first pre-bending upper pressing roller and the second pre-bending upper pressing roller are symmetrically arranged on the two sides of the pre-bending lower pressing roller left and right. The edge rolling assembly receives the pre-bent plate and completes edge rolling forming. The two ends of the pre-bending downward-pressing roller are installed on the pair of first floating self-adjusting assemblies. The feeding clamping roller assembly comprises a feeding lower pressing roller wheel and a feeding upper pressing roller wheel which is arranged over the feeding lower pressing roller wheel and can vertically float. According to the edge rolling mechanism with the pre-bending function, the head and the tail of a plate can be pre-bent, and the roundness of an edge-rolled barrel plate is improved.

Description

Technical Field

[0001] This utility model relates to the field of rolling mechanism technology, and in particular to a rolling mechanism with pre-bending function. Background Technology

[0002] In the production process of steel drums, the rolling process of the drum body is crucial. In the existing technology, a three-roll plate rolling machine is usually used for rolling. The working principle of the three-roll plate rolling machine is to use the rotation and extrusion of the upper pressure roller, lower pressure roller and side roller to gradually bend the flat metal material into the required circle. However, the existing three-roll plate rolling machine will produce straight sections (straight edges) at both ends of the rolled drum plate. This phenomenon not only affects the roundness of the steel drum, but may also have an adverse effect on its performance. Now, a rolling mechanism with pre-bending function is proposed to solve the problems existing in the existing technology. Utility Model Content

[0003] The purpose of this invention is to provide a rolling mechanism with a pre-bending function to solve the problem that straight sections appear at both ends of the steel drum in the existing three-roll plate rolling machine. This phenomenon not only affects the roundness of the steel drum, but may also have an adverse effect on its performance.

[0004] The technical solution of this utility model is: a rolling mechanism with pre-bending function, comprising:

[0005] The feeding clamping roller assembly, the pre-bending assembly, and the rolling assembly are arranged sequentially along the direction of material movement;

[0006] The feed roller assembly clamps and feeds the sheet material.

[0007] The pre-bending assembly includes a vertically floating pre-bending lower pressure roller and a first pre-bending upper pressure roller and a second pre-bending upper pressure roller symmetrically arranged on both sides of the pre-bending lower pressure roller.

[0008] The rolling assembly receives the pre-bent sheet material and completes the rolling process.

[0009] Preferably, the two ends of the pre-bent pressure roller are mounted on a pair of first floating self-adjusting components;

[0010] The feeding clamping roller assembly includes a lower feeding roller and a vertically floating upper feeding roller disposed directly above the lower feeding roller. The two ends of the upper feeding roller are mounted on a pair of second floating self-adjusting assemblies.

[0011] The rolling assembly includes a lower rolling roller, a vertically floating upper rolling roller positioned directly above the lower rolling roller, a side rolling roller positioned away from the pre-bending assembly on the upper rolling roller, and a drive module that drives the side rolling roller to move away from or near the upper rolling roller along an arc-shaped trajectory. The two ends of the upper rolling roller are mounted on a pair of third floating self-adjusting assemblies.

[0012] Preferably, each of the first floating self-adjusting components includes a fixed base and a screw that is vertically movably inserted into the fixed base; a first spring that is always in a compressed state is sleeved on the shank of the screw, and the first spring is compressed between the nut of the screw and the fixed base; a first mounting seat is fixed at the end of the screw away from the nut, and the two ends of the pre-bent pressure roller are mounted on a pair of first mounting seats through bearings.

[0013] Preferably, both ends of the feeding lower pressure roller and the rolling lower pressure roller are mounted on the mounting frame via bearings;

[0014] The pair of second floating self-adjusting components and the pair of third floating self-adjusting components have the same structure, and each second floating self-adjusting component includes a spring support, a second spring, and a second mounting base;

[0015] The spring support includes a threaded rod, an annular boss with a diameter larger than that of the threaded rod, and a connecting rod arranged sequentially from top to bottom. The top of the second mounting base is provided with a mounting groove for placing the second spring. The second spring is sleeved on the connecting rod and is pressed between the annular boss and the bottom surface of the mounting groove, and is always in a compressed state.

[0016] The mounting bracket is provided with a U-shaped groove for mounting the second floating self-adjusting component. The spring support is fixedly mounted on the mounting bracket by a threaded rod. The inner walls of both sides of the U-shaped groove are provided with protrusions. The second mounting seat is provided with guide grooves for the protrusions to be inserted.

[0017] Preferably, the drive module includes a pair of adjustment fixing plates fixed on the mounting bracket and having circular bosses protruding from them, an adjustment bracket rotatably mounted on the pair of circular bosses via bearings, and a first drive component that drives the adjustment bracket to swing along an arc-shaped trajectory with the central axis of the circular bosses as a reference.

[0018] The side-rolled circular roller is mounted on the adjusting frame via bearings;

[0019] The central axis of each of the circular bosses is coaxial with the upper pressure roller when it is not performing a rolling action.

[0020] Preferably, the first driving component is a worm gear screw jack, and the screw of the worm gear screw jack is hinged to the adjusting frame;

[0021] The drive module also includes a tensioning cylinder for tightening the adjustment frame. The cylinder body of the tensioning cylinder is hinged to the mounting plate, and the end of the piston rod of the tensioning cylinder is hinged to the adjustment frame.

[0022] Preferably, the feeding lower pressure roller, feeding upper pressure roller, rolling lower pressure roller, rolling upper pressure roller, and side rolling roller are driven to roll by a second driving member.

[0023] Preferably, the end of the lower roller for rolling is fixedly equipped with a first gear, a second gear, a first synchronous pulley, and a second synchronous pulley; the upper roller for rolling is fixedly equipped with a third gear; the side roller for rolling is fixedly equipped with a fourth gear; the lower roller for feeding is fixedly equipped with a fifth gear and a third synchronous pulley; and the upper roller for feeding is equipped with a sixth gear.

[0024] A fourth synchronous pulley is provided on the output shaft of the second drive component; a first synchronous belt is fitted onto the first and fourth synchronous pulleys; a second synchronous belt is fitted onto the second and third synchronous pulleys.

[0025] The second gear meshes with the third gear; the fifth gear meshes with the sixth gear;

[0026] The first gear drives the fourth gear to rotate through gear transmission.

[0027] Compared with the prior art, the advantages of this utility model are:

[0028] (1) A rolling mechanism with pre-bending function in this utility model includes a feeding clamping roller assembly, a pre-bending assembly, and a rolling assembly arranged sequentially along the forward direction of the plate. The pre-bending assembly includes a pre-bending lower pressure roller that can float vertically, and a first pre-bending upper pressure roller and a second pre-bending upper pressure roller that are symmetrically arranged on both sides of the pre-bending lower pressure roller. The function of the pre-bending assembly is, on the one hand, to pre-bend the head and tail of the plate to overcome the problem that straight sections appear at the head and tail of the barrel plate in the prior art, so that the curvature of the head and tail after rolling is consistent with the barrel body, thereby improving the roundness of the rolled barrel plate; on the other hand, to pre-bend the middle section of the plate to change the rigidity of the plate, reduce the yield strength, reduce the torque required by the subsequent rolling assembly, and significantly reduce the energy consumption of the equipment.

[0029] (2) In the present invention, a rolling mechanism with pre-bending function is provided. The feeding lower pressure roller, feeding upper pressure roller, rolling lower pressure roller, rolling upper pressure roller, and side rolling roller are driven to roll by a second driving member. All rollers are linked by a single driving member in conjunction with gears, synchronous pulleys, and synchronous belts to eliminate the synchronization error of multi-motor drive, ensure that the roller speeds are strictly matched in the feeding and rolling processes, and avoid the slippage of the board or surface scratches caused by speed difference. Attached Figure Description

[0030] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0031] Figure 1 This is a front view structural diagram of a rolling mechanism with pre-bending function according to the present invention;

[0032] Figure 2 This is a schematic diagram of the movement path of the sheet metal in the rolling mechanism with pre-bending function described in this utility model;

[0033] Figure 3 This is a rear view structural schematic diagram of a rolling mechanism with pre-bending function according to the present invention.

[0034] Figure 4 This is a schematic diagram of the structure of the rolling mechanism with pre-bending function described in this utility model from an elevation view.

[0035] Figure 5 This is a schematic diagram of the structure of the second floating self-adjusting component of this utility model;

[0036] Figure 6 This is a schematic diagram of the head and tail structure of the sheet metal after pre-bending according to the present invention;

[0037] Figure 7 This is a schematic diagram of the structure of the drive module of the present invention after the driven side roller moves along an arc-shaped trajectory.

[0038] Among them: 10, feeding clamping roller assembly, 11, feeding lower pressure roller, 12, feeding upper pressure roller, 13, spring support, 14, threaded rod, 15, annular boss, 16, second spring, 17, second mounting base, 18, protrusion, 19, fifth gear, 110, third synchronous belt pulley, 111, sixth gear.

[0039] 20. Pre-bending assembly; 21. Pre-bending lower pressure roller; 22. First pre-bending upper pressure roller; 23. Second pre-bending upper pressure roller; 24. Fixing seat; 25. Screw; 26. First spring; 27. First mounting seat.

[0040] 30. Rolling assembly; 31. Lower rolling roller; 32. Upper rolling roller; 33. Side rolling roller; 34. Adjusting and fixing plate; 35. Circular boss; 36. Adjusting frame; 37. Worm gear screw jack; 38. Screw; 39. Tensioning cylinder; 310. Motor; 311. First gear; 312. Second gear; 313. First synchronous belt pulley; 314. Second synchronous belt pulley; 315. Second synchronous belt; 316. Fourth gear; 317. Fourth synchronous belt pulley; 318. First synchronous belt;

[0041] 40. Mounting bracket;

[0042] 50. Board material. Detailed Implementation

[0043] The present invention will be further described in detail below with reference to specific embodiments:

[0044] like Figure 1 , Figure 2 As shown, a rolling mechanism with pre-bending function includes: a feeding clamping roller assembly 10, a pre-bending assembly 20, and a rolling assembly 30 arranged sequentially along the forward direction of the sheet 50; the feeding clamping roller assembly 10 clamps and feeds the sheet 50; the pre-bending assembly 20 includes a vertically floating pre-bending lower pressure roller 21, a first pre-bending upper pressure roller 22 and a second pre-bending upper pressure roller 23 symmetrically arranged on both sides of the pre-bending lower pressure roller 21; the rolling assembly 30 receives the pre-bent sheet 50 and completes the rolling forming.

[0045] In this embodiment, the rotation of the pre-bending lower pressure roller 21, the first pre-bending upper pressure roller 22, and the second pre-bending upper pressure roller 23 in the pre-bending assembly 20 is not driven by any force. The feeding clamping roller assembly 10 and the rolling assembly 30 clamp the sheet 50, driving the rotation of the pre-bending lower pressure roller 21, the first pre-bending upper pressure roller 22, and the second pre-bending upper pressure roller 23. The two ends of the pre-bending lower pressure roller 21 are mounted on a pair of first floating self-adjusting assemblies. Figure 1 , Figure 4 As shown, each first floating self-adjusting component includes a fixed base 24 and a screw 25 that is vertically movably inserted into the fixed base 24; a first spring 26 that is always in a compressed state is sleeved on the rod of the screw 25, and the first spring 26 is pressed between the nut of the screw 25 and the fixed base 24; a first mounting seat 27 is fixed to the end of the screw 25 away from the nut, and the two ends of the pre-bent pressure roller 21 are mounted on a pair of first mounting seats 27 through bearings. When no pre-bending operation is performed, the pre-bending lower pressure roller 21 abuts against the first pre-bending upper pressure roller 22 and the second pre-bending upper pressure roller 23, providing a downward pulling force to the screw 25. When the plate 50 is pre-bent, the plate 50 with a certain thickness provides a downward pushing force to the pre-bending lower pressure roller 21. The pre-bending lower pressure roller 21 overcomes the elastic force of the first spring 26 and moves downward, while always cooperating with the first pre-bending upper pressure roller 22 and the second pre-bending upper pressure roller 23 to clamp the plate 50. The pre-bending lower pressure roller 21 can automatically adjust its downward stroke according to different plate thicknesses and cooperate with the first pre-bending upper pressure roller 22 and the second pre-bending upper pressure roller 23 to complete the pre-bending of the plate 50. In this embodiment, the function of the pre-bending assembly 20 is, on the one hand, to pre-bend the head and tail of the plate 50 to achieve the following: Figure 6The shape shown overcomes the problem of straight segments appearing at both ends of the rolled cylindrical plate in the prior art. After rolling, the curvature of the head and tail is consistent with the barrel body, improving the roundness of the rolled cylindrical plate. On the other hand, the middle section of the plate 50 is pre-bent, which changes the rigidity of the plate 50, reduces the yield strength, and reduces the torque required by the subsequent rolling assembly 30, significantly reducing the energy consumption of the equipment.

[0046] like Figure 1 , Figure 2 As shown, the feeding clamping roller assembly 10 includes a feeding lower pressure roller 11 and a vertically floating feeding upper pressure roller 12 disposed directly above the feeding lower pressure roller 11. The two ends of the feeding upper pressure roller 12 are mounted on a pair of second floating self-adjusting components. The rolling assembly 30 includes a rolling lower pressure roller 31, a vertically floating rolling upper pressure roller 32 disposed directly above the rolling lower pressure roller 31, a side rolling roller 33 disposed on the side of the rolling upper pressure roller 32 away from the pre-bending assembly 20, and a drive module that drives the side rolling roller 33 to move away from or near the rolling upper pressure roller 32 along an arc-shaped trajectory. The two ends of the rolling upper pressure roller 32 are mounted on a pair of third floating self-adjusting components.

[0047] Both ends of the feed roller 11 and the rolling roller 31 are mounted on the mounting frame 40 via bearings; the structure of the pair of second floating self-adjusting components and the pair of third floating self-adjusting components is the same, such as... Figure 5As shown, each second floating self-adjusting component includes a spring support 13, a second spring 16, and a second mounting base 17. The spring support 13 includes a threaded rod 14 (the thread of the threaded rod 14 is not shown in the figure), an annular boss 15 with a diameter larger than that of the threaded rod 14, and a connecting rod arranged sequentially from top to bottom. The top of the second mounting base 17 is provided with a mounting groove for placing the second spring 16. The second spring 16 is sleeved on the connecting rod and is compressed between the annular boss 15 and the bottom surface of the mounting groove, and is always in a compressed state. The mounting frame 40 is provided with a U-shaped groove for mounting the second floating self-adjusting component. The spring support 13 is fixedly mounted on the mounting frame 40 through the threaded rod 14. The inner walls of both sides of the U-shaped groove are provided with protrusions 18. The second mounting base 17 is provided with guide grooves for the protrusions 18 to be inserted. The floating working principle of the upper feeding pressure roller 12 and the upper rolling pressure roller 32 is the same. Here, we take the upper feeding pressure roller 12 as an example for explanation: When no clamping and feeding operation is performed, the second mounting seat 17 abuts against the bottom of the U-shaped groove under the action of the elastic force of the second spring 16, and the upper feeding pressure roller 12 is in contact with the lower feeding pressure roller 11; when the clamping and feeding operation is performed, the plate 50 with a certain thickness gives the upper feeding pressure roller 12 an upward thrust. The upper feeding pressure roller 12 overcomes the elastic force of the second spring 16 and moves upward under the guidance of the convex strip 18 and the guide groove, while always cooperating with the lower feeding pressure roller 11 to clamp the plate 50; the upper feeding pressure roller 12 can automatically adjust the upward stroke according to different plate thicknesses 50, and cooperate with the lower feeding pressure roller 11 to complete the clamping and feeding of the plate 50.

[0048] like Figure 1 , Figure 7 As shown, the drive module includes a pair of adjusting and fixing plates 34 with circular bosses 35 protruding from the mounting frame 40, an adjusting frame 36 rotatably mounted on the pair of circular bosses 35 via bearings, and a first driving member that drives the adjusting frame 36 to swing along an arc-shaped trajectory with the central axis of the circular bosses 35 as a reference. The side rolling roller 33 is mounted on the adjusting frame 36 via bearings. The central axis of each circular boss 35 is coaxial with the rolling pressure roller 32 when it is not rolling. The first driving member is a worm gear screw jack 37, and the screw 38 of the worm gear screw jack 37 is hinged to the adjusting frame 36. The drive module also includes a tensioning cylinder 39 that tensions the adjusting frame 36. The cylinder body of the tensioning cylinder 39 is hinged to the mounting plate (not shown in the figure), and the end of the piston rod of the tensioning cylinder 39 is hinged to the adjusting frame 36. The tensioning cylinder 39 is equivalent to a tension spring. In this embodiment, the working principle of the drive module is as follows: when the plate 50 of different lengths is replaced, the screw 38 of the worm gear screw jack 37 is driven to rise and fall vertically, and the screw 38 in turn drives the adjusting frame 36 to swing along an arc-shaped trajectory with the central axis of the circular boss 35 as the reference (e.g., Figure 7As shown), the side rolling roller 33 installed on the adjusting frame 36 is driven to move away from or closer to the rolling pressure roller 32 along an arc-shaped trajectory, thereby enabling the rolling assembly 30 to roll the plates 50 of different lengths.

[0049] The feeding lower pressure roller 11, feeding upper pressure roller 12, rolling lower pressure roller 31, rolling upper pressure roller 32, and side rolling roller 33 are driven to roll by a second driving member. In this embodiment, the second driving member is a motor 310. Figure 3 , Figure 4 As shown, the end of the lower rolling roller 31 is fixedly equipped with a first gear 311, a second gear 312, a first synchronous pulley 313, and a second synchronous pulley 314; the upper rolling roller 32 is fixedly equipped with a third gear; and the side rolling roller 33 is fixedly equipped with a fourth gear 316. Figure 1 As shown, a fifth gear 19 and a third synchronous pulley 110 are fixedly installed on the lower feed roller 11, and a sixth gear 111 is installed on the upper feed roller 12; a fourth synchronous pulley 317 is provided on the output shaft of the second drive unit, and a first synchronous belt 318 is sleeved on the first synchronous pulley 313 and the fourth synchronous pulley 317; a second synchronous belt 315 is sleeved on the second synchronous pulley 314 and the third synchronous pulley 110; the second gear 312 meshes with the third gear; the fifth gear 19 meshes with the sixth gear 111; the first gear 311 drives the fourth gear 316 to rotate through gear transmission. In this embodiment, motor 310 drives the first synchronous belt pulley 313 to rotate, which in turn drives the lower rolling roller 31 to rotate. The rotation of the lower rolling roller 31 drives the first gear 311, the second gear 312, and the second synchronous belt pulley 314 to rotate. The first gear 311 drives the fourth gear 316 to rotate, which in turn drives the side rolling roller 33 to rotate. The rotation of the second gear 312 drives the lower rolling roller 31 and the upper rolling roller 32 to rotate. The rotation of the second synchronous belt pulley 314 drives the third synchronous belt pulley 110 to rotate, which in turn drives the lower feeding roller 11 and the upper feeding roller 12 to rotate. By using a single driving component in conjunction with gears, synchronous belts, and synchronous belts to link all rollers, the synchronization error caused by multiple motor drives is eliminated, ensuring that the roller speeds are strictly matched during the feeding and rolling processes, and avoiding slippage or surface scratches on the sheet material 50 due to speed differences.

[0050] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. It is obvious to those skilled in the art that this utility model is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and therefore, all changes falling within the meaning and scope of the equivalents of the claims are intended to be included within this utility model.

Claims

1. A rolling mechanism with pre-bending function, characterized in that, include: The feeding clamping roller assembly, the pre-bending assembly, and the rolling assembly are arranged sequentially along the direction of material movement; The feed roller assembly clamps and feeds the sheet material. The pre-bending assembly includes a vertically floating pre-bending lower pressure roller and a first pre-bending upper pressure roller and a second pre-bending upper pressure roller symmetrically arranged on both sides of the pre-bending lower pressure roller. The rolling assembly receives the pre-bent sheet material and completes the rolling process.

2. The rolling mechanism with pre-bending function according to claim 1, characterized in that: The two ends of the pre-bent pressure roller are mounted on a pair of first floating self-adjusting components; The feeding clamping roller assembly includes a lower feeding roller and a vertically floating upper feeding roller disposed directly above the lower feeding roller. The two ends of the upper feeding roller are mounted on a pair of second floating self-adjusting assemblies. The rolling assembly includes a lower rolling roller, a vertically floating upper rolling roller positioned directly above the lower rolling roller, a side rolling roller positioned away from the pre-bending assembly on the upper rolling roller, and a drive module that drives the side rolling roller to move away from or near the upper rolling roller along an arc-shaped trajectory. The two ends of the upper rolling roller are mounted on a pair of third floating self-adjusting assemblies.

3. A rolling mechanism with pre-bending function according to claim 2, characterized in that: Each of the first floating self-adjusting components includes a fixed base and a screw that is vertically movably inserted into the fixed base; a first spring that is always in a compressed state is sleeved on the shank of the screw, and the first spring is compressed between the nut of the screw and the fixed base; a first mounting seat is fixed at the end of the screw away from the nut, and the two ends of the pre-bent pressure roller are mounted on a pair of first mounting seats through bearings.

4. A rolling mechanism with pre-bending function according to claim 2, characterized in that: Both ends of the feeding lower pressure roller and the rolling lower pressure roller are mounted on the mounting frame via bearings; The pair of second floating self-adjusting components and the pair of third floating self-adjusting components have the same structure, and each second floating self-adjusting component includes a spring support, a second spring, and a second mounting base; The spring support includes a threaded rod, an annular boss with a diameter larger than that of the threaded rod, and a connecting rod arranged sequentially from top to bottom. The top of the second mounting base is provided with a mounting groove for placing the second spring. The second spring is sleeved on the connecting rod and is pressed between the annular boss and the bottom surface of the mounting groove, and is always in a compressed state. The mounting bracket is provided with a U-shaped groove for mounting the second floating self-adjusting component. The spring support is fixedly mounted on the mounting bracket by a threaded rod. The inner walls of both sides of the U-shaped groove are provided with protrusions. The second mounting seat is provided with guide grooves for the protrusions to be inserted.

5. A rolling mechanism with pre-bending function according to claim 4, characterized in that: The drive module includes a pair of adjustment fixing plates fixed on the mounting bracket and having circular bosses protruding from them; an adjustment bracket rotatably mounted on the pair of circular bosses via bearings; and a first drive component that drives the adjustment bracket to swing along an arc-shaped trajectory with the central axis of the circular bosses as a reference. The side-rolled circular roller is mounted on the adjusting frame via bearings; The central axis of each of the circular bosses is coaxial with the upper pressure roller when it is not performing a rolling action.

6. A rolling mechanism with pre-bending function according to claim 5, characterized in that: The first driving component is a worm gear screw jack, and the screw of the worm gear screw jack is hinged to the adjusting frame; The drive module also includes a tensioning cylinder for tightening the adjustment frame. The cylinder body of the tensioning cylinder is hinged to the mounting plate, and the end of the piston rod of the tensioning cylinder is hinged to the adjustment frame.

7. A rolling mechanism with pre-bending function according to claim 2, characterized in that: The feed lower pressure roller, feed upper pressure roller, rolling lower pressure roller, rolling upper pressure roller, and side rolling roller are driven to roll by a second driving component.

8. A rolling mechanism with pre-bending function according to claim 7, characterized in that: The end of the lower roller for rolling is fixedly equipped with a first gear, a second gear, a first synchronous pulley, and a second synchronous pulley; the upper roller for rolling is fixedly equipped with a third gear; the side roller for rolling is fixedly equipped with a fourth gear; the lower roller for feeding is fixedly equipped with a fifth gear and a third synchronous pulley; and the upper roller for feeding is equipped with a sixth gear. A fourth synchronous pulley is provided on the output shaft of the second drive component; a first synchronous belt is fitted onto the first and fourth synchronous pulleys; a second synchronous belt is fitted onto the second and third synchronous pulleys. The second gear meshes with the third gear; the fifth gear meshes with the sixth gear; The first gear drives the fourth gear to rotate through gear transmission.

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