Pipeline welding equipment

Abstract

The invention discloses pipeline welding equipment. The pipeline welding equipment comprises a shell, an open fluted disc, a driving motor and a transmission part, the transmission part is arranged between the driving motor and the open fluted disc, and the driving motor is in driving connection with the open fluted disc through the transmission part so as to drive the open fluted disc and a welding needle arranged on the open fluted disc to rotate, so that a pipeline is welded; the transmission part comprises a transmission assembly and a fluted disc driving gear, and the fluted disc driving gear is meshed with the opening fluted disc; wherein the driving motor is arranged in the shell; the transmission part transmits the driving force of the driving motor to the fluted disc driving gear and the open fluted disc in a belt transmission mode. The problem that an existing pipeline welding device can generate interference under the condition that the welding space is narrow and small, and consequently the welding device cannot conduct clamping is solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of automatic welding, and more particularly, relates to a pipeline welding device. Background Art

[0002] Welding, also known as fusion, is a manufacturing process and technology that joins metals or other thermoplastic materials such as plastics by heating, high temperature or high pressure.

[0003] Existing pipe welding equipment usually adopts an external drive motor, which results in a relatively large size of the pipe welding equipment and is not suitable for situations where the welding space is relatively narrow. In situations where the welding space is relatively narrow, interference will occur, making it impossible to clamp the welding equipment. Summary of the Invention

[0004] In order to solve the problem that existing pipe welding equipment will cause interference and make the welding equipment unable to be clamped when the welding space is relatively narrow, the purpose of the present invention is to provide a pipe welding equipment, which includes: a housing, an open toothed disc, a drive motor, and a transmission part; the transmission part is arranged between the drive motor and the open toothed disc, and the drive motor drives the open toothed disc through the transmission part to drive the open toothed disc and the welding needle arranged on the open toothed disc to rotate and perform welding operations on the pipeline; the transmission part includes a transmission assembly and a toothed disc drive gear, and the toothed disc drive gear is engaged with the open toothed disc; wherein, the drive motor is arranged in the housing; the transmission part transmits the driving force of the drive motor to the toothed disc drive gear and the open toothed disc in the form of a belt drive.

[0005] Furthermore, the transmission assembly includes: a first transmission gear, which is arranged at the output end of the driving motor; a transmission rod, which is connected to the sprocket drive gear; a second transmission gear, which is arranged on the transmission rod; and a synchronous belt, which is connected to the first transmission gear and the second transmission gear; wherein, the driving motor can drive the synchronous belt and the second transmission gear to rotate through the first transmission gear, thereby driving the transmission rod to rotate and transmitting the driving force to the sprocket drive gear.

[0006] Furthermore, the transmission assembly also includes: a synchronous belt tensioning structure, which is arranged on the outside of the synchronous belt.

[0007] Furthermore, the pipe welding equipment also includes: a clutch assembly, which is arranged between the first transmission gear and the output end of the drive motor; a clutch handle, which is arranged on the outside of the shell and connected to the side of the first transmission gear away from the output end of the drive motor; wherein, when the drive motor is turned off, the power transmitted from the output end of the drive motor to the transmission assembly can be cut off by pulling the clutch handle, so that the open gear disc can be manually reset.

[0008] Furthermore, the clutch assembly includes: a first spline, arranged at the output end of the drive motor; a second spline, arranged on the mounting shaft of the first transmission gear, and cooperating with the first spline to realize power transmission or power cutoff between the drive motor and the first transmission gear.

[0009] Furthermore, the pipeline welding equipment also includes: a return spring, which is arranged on the transmission rod; wherein, when the clutch handle is pulled, the first transmission gear can drive the synchronous belt, the second transmission gear and the transmission rod to move toward the direction close to the clutch handle, and the return spring is compressed; when the external force acting on the clutch handle is released, the return elastic force of the return spring can drive the transmission assembly to return to its initial position.

[0010] Furthermore, the pipeline welding equipment also includes: a bevel gear assembly, which is arranged between the transmission rod and the gear disc drive gear; wherein the transmission rod drives the gear disc drive gear to rotate through the bevel gear assembly.

[0011] Furthermore, the bevel gear assembly includes: a first bevel gear, which is arranged on the transmission rod; and a second bevel gear, which is fixedly connected to the gear drive gear; wherein the first bevel gear is meshed with the second bevel gear to transmit the driving force at the transmission rod to the gear drive gear.

[0012] Furthermore, the return spring is located on a side of the first bevel gear close to the clutch handle.

[0013] Furthermore, the pipeline welding equipment includes two transmission assemblies and two toothed disc drive gears; wherein, the opening width of the open toothed disc is smaller than the gear spacing between the two toothed disc drive gears.

[0014] Furthermore, the housing is provided with a toothed disc sliding groove, and the open toothed disc rotates along the toothed disc sliding groove.

[0015] Furthermore, the pipeline welding equipment also includes: a plurality of rollers, which are arranged between the open toothed disc and the toothed disc groove, and are used to reduce the friction force when the open toothed disc rotates in the toothed disc groove.

[0016] Furthermore, the plurality of rollers are rotatably mounted on the inner wall of the toothed disc slot, and a first slot is provided on a side of the open toothed disc close to the rollers; wherein, when the open toothed disc rotates, the rollers roll along the inner wall of the first slot.

[0017] Technical effects and advantages of the present invention:

[0018] 1. When the drive motor is built-in, compared with gear transmission, a transmission assembly is provided to transmit the driving force of the drive motor to the gear drive gear and the open gear through a belt drive, which can reduce the thickness of the transmission part of the pipe welding equipment and make the pipe welding equipment thinner. In this case, the compactness and size of the structure of the pipe welding equipment are further improved when the drive motor is built-in, and the applicability of the pipe welding equipment is further improved.

[0019] 2. By arranging a transmission rod to drive the sprocket drive gear to rotate through the bevel gear assembly, it is possible to ensure transmission stability and transmission efficiency between the transmission rod and the sprocket drive gear while achieving the clutch function. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a structural diagram of a pipeline welding device provided by the present application;

[0021] Figure 2 yes Figure 1 Schematic diagram of the internal structure of the mid-pipe welding equipment;

[0022] Figure 3 yes Figure 1 Schematic diagram of the internal structure of the mid-pipe welding equipment from another perspective;

[0023] Figure 4 yes Figure 1 Specific transmission diagram of the mid-pipeline welding equipment;

[0024] Figure 5 yes Figure 1 Schematic diagram of the structure of the mid-pipe welding equipment from another perspective;

[0025] Figure 6 yes Figure 5 Enlarged view of point A in the middle.

[0026] In the picture:

[0027] 10. Housing; 11. First housing; 12. Second housing; 13. Toothed disc slide;

[0028] 14. Roller; 15. Mounting opening; 20. Drive motor; 30. Transmission part; 40. Transmission assembly; 41. First transmission gear; 42. Second transmission gear; 43. Synchronous belt; 44. Transmission rod; 45. Synchronous belt pressure rod; 46. First bevel gear; 47. Second bevel gear; 48. Pressure block; 50. Sprocket drive gear; 51. First drive gear; 52. Second drive gear; 60. Open sprocket; 61. First slide groove; 70. Clutch assembly; 71. Clutch handle; 72. First spline; 73. Second spline; 74. Return spring; 80. Hand-held part. DETAILED DESCRIPTION

[0029] The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments. The embodiments of the present invention are provided for purposes of illustration and description and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those skilled in the art. The embodiments are chosen and described to better illustrate the principles of the invention and its practical application, and to enable those skilled in the art to understand the invention and design various embodiments with various modifications suitable for specific applications.

[0030] See also Figure 1 , which is a structural diagram of a pipeline welding device provided by the present invention. Figures 1 to 6 The pipe welding equipment, for example, includes: a housing 10, a drive motor 20, a transmission part 30, and an open toothed disc 60. The transmission part 30 is arranged between the drive motor 20 and the open toothed disc 60, and the drive motor 20 drives the open toothed disc 60 through the transmission part 30 to drive the open toothed disc 60 and the welding pins arranged on the open toothed disc 60 to rotate, thereby performing a welding operation on the pipe. For example, the housing 10 and the open toothed disc 60 are both provided with a mounting opening 15 for accommodating the pipe to be welded; when welding the pipe to be welded, the welding point of the pipe to be welded is located in the mounting opening 15, and the drive motor 20 drives the open toothed disc 60 to rotate through the transmission part 30, thereby driving the welding pins arranged on the open toothed disc 60 to rotate through the open toothed disc 60, forming an annular weld at the welding point of the pipe to be welded, and welding the two sections of the pipe to be welded together.

[0031] For example, the housing 10 includes a first housing 11 and a second housing 12. In a specific embodiment, the first housing 11 is a mounting base, the second housing 12 is a mounting cover, and the second housing 12 is further provided with a handle 80, which an operator can hold to perform welding operations.

[0032] Specifically, the drive motor 20 is disposed within the housing 10, and the transmission unit 30 includes a transmission assembly 40 and a sprocket drive gear 50. The sprocket drive gear 50 is meshed with an open sprocket 60, and the transmission assembly 40 transmits the driving force of the drive motor 20 to the sprocket drive gear 50 and the open sprocket 60 via a belt drive.

[0033] It is understandable that existing pipe welding equipment typically uses an external drive motor, resulting in a relatively large size of the pipe welding equipment, making it unsuitable for use in situations where welding space is relatively small. By arranging the drive motor 20 within the housing 10, the structural design of the pipe welding equipment can be made more compact, reducing the size and footprint of the pipe welding equipment, thereby making the pipe welding equipment suitable for welding scenarios with limited welding space and improving the applicability of the pipe welding equipment.

[0034] It should be noted that when the distance between the output shaft of the drive motor 20 and the gear drive gear 50 is the same, if the driving force of the drive motor 20 is transmitted to the gear drive gear 50 through gear transmission, the transmission part of the pipe welding equipment will be thicker or wider due to the influence of the gear radius, resulting in the overall size of the pipe welding equipment being larger.

[0035] When the drive motor 20 is built-in, compared with gear transmission, a transmission assembly 40 is set to transmit the driving force of the drive motor 20 to the gear drive gear 50 and the open gear 60 through belt transmission, which can reduce the thickness of the transmission part of the pipe welding equipment and make the pipe welding equipment thinner, thereby further improving the structural compactness and size of the pipe welding equipment when the drive motor 20 is built-in, and further improving the applicability of the pipe welding equipment.

[0036] Furthermore, the transmission assembly 40 includes, for example, a first transmission gear 41, a second transmission gear 42, a timing belt 43, and a transmission rod 44. The first transmission gear 41 is disposed at the output end of the drive motor 20; the first transmission gear 41 and the second transmission gear 42 are connected by a timing belt 43; and the second transmission gear 42 is disposed on the transmission rod 44.

[0037] In a specific embodiment, the driving motor 20 rotates, which can drive the first transmission gear 41 to rotate; the first transmission gear 41 drives the second transmission gear 42 to rotate through the synchronous belt 43; the second transmission gear 42 drives the transmission rod 44 to rotate, thereby transmitting the driving force output by the driving motor 20 to the gear drive gear 50 and the open gear 60 through the transmission rod 44.

[0038] Furthermore, the transmission assembly 40 also includes a timing belt tensioning structure. As is understandable, since belt drives are flexible, the belt may become loose over time, leading to belt slippage and reduced transmission efficiency. Therefore, the timing belt 43 needs to be tensioned to ensure the transmission efficiency and stability of the transmission assembly 40. Because the distance between the drive motor 20 and the transmission rod 44 is constant, the center distance between the first transmission gear 41 and the second transmission gear 42 is not adjustable. Adjusting the center distance is not feasible to tension the timing belt 43, necessitating the addition of a timing belt tensioning structure.

[0039] Preferably, the timing belt tensioning structure is disposed outside the timing belt 43. It should be noted that if the timing belt tensioning structure is disposed inside the timing belt 43, the timing belt 43 will protrude outward, resulting in a thicker transmission portion of the pipe welding equipment. By disposing the timing belt tensioning structure outside the timing belt 43, this protrusion of the timing belt 43 can be avoided, thereby making the transmission assembly 40 more compact and the transmission portion of the pipe welding equipment thinner.

[0040] In one embodiment, the first transmission gear 41 is a driving wheel, the second transmission gear 42 is a driven wheel, and the synchronous belt tensioning structure is a pressure rod 45 disposed outside the synchronous belt 43. For example, the pressure rod 45 is disposed within the housing via a pressure block 48, and the transmission rod 44 is partially clamped on one side of the pressure block 48 to ensure transmission stability of the transmission rod 44.

[0041] Furthermore, the pipe welding equipment may also include, for example, a clutch assembly 70 and a clutch handle 71. The clutch assembly 70 is disposed between the first transmission gear 41 and the output end of the drive motor 20. The clutch handle 71 is disposed outside the housing 10 and connected to the side of the first transmission gear 41 away from the output end of the drive motor 20. Pulling the clutch handle 71 cuts off power transmission between the first transmission gear 41 and the output end of the drive motor 20, allowing manual resetting of the open gear disc 60.

[0042] Specifically, the clutch assembly 70 includes, for example, a first spline 72 and a second spline 73. The first spline 72 is provided at the output end of the drive motor 20, and the second spline 73 is provided on the mounting shaft of the first transmission gear 41. The first spline 72 and the second spline 73 cooperate to achieve power transmission and power disconnection between the first transmission gear 41 and the drive motor 20.

[0043] Furthermore, the pipeline welding device further includes, for example: a return spring 74 . The return spring 74 is provided on the transmission rod 44 . When the clutch handle 71 is pulled, the clutch handle 71 can drive the first transmission gear 41 to move in the direction away from the output end of the drive motor 20, so that the first spline 72 and the second spline 73 are separated, cutting off the power transmission between the first transmission gear 41 and the output end of the drive motor 20; when the first transmission gear 41 moves in the direction away from the output end of the drive motor 20, the second spline 73, the second transmission gear 42, the synchronous belt 43, and the transmission rod 44 will all move in the direction away from the output end of the drive motor 20. At this time, the return spring 74 is compressed, and the first spline 72 and the second spline 73 are separated; when the force acting on the clutch handle 71 disappears, the return elastic force of the return spring 74 can drive the transmission rod 44 to return to its initial position. When the transmission rod 44 is reset, the second transmission gear 42, the synchronous belt 43, the first transmission gear 41, the second spline 73, and the clutch handle 71 are all reset, and the first spline 72 and the second spline 73 are engaged.

[0044] It should be noted that after the welding operation is completed, if there is no clutch assembly 70, the open toothed disc 60 needs to be driven to reset by the drive motor 20. After the clutch assembly 70 is set, the power transmission between the first transmission gear 41 and the drive motor 20 can be cut off by the clutch assembly 70, and the open toothed disc 60 can be manually reset, which is more convenient and energy-saving.

[0045] Furthermore, the pipeline welding equipment may further include a bevel gear assembly, wherein the bevel gear assembly is disposed between the transmission rod 44 and the toothed disc drive gear 50 , and the transmission rod 44 drives the toothed disc drive gear 50 to rotate via the bevel gear assembly.

[0046] It should be noted that when the clutch handle 71 is pulled, the first transmission gear 41, the second transmission gear 42, the timing belt 43, and the transmission rod 44 all move axially along the transmission rod 44. If a worm gear structure were used to transmit power between the transmission rod 44 and the toothed drive gear 50, the transmission rod 44 would become immobile or the worm gear structure would slip when the transmission rod 44 moves. By arranging for the transmission rod 44 to drive the toothed drive gear 50 through the bevel gear assembly, the transmission stability and efficiency between the transmission rod 44 and the toothed drive gear 50 can be maintained while achieving the clutch function.

[0047] Specifically, the bevel gear assembly includes a first bevel gear 46 and a second bevel gear 47. The first bevel gear 46 is mounted on the transmission rod 44, and the second bevel gear 47 is fixedly connected to the toothed drive gear 50. The first bevel gear 46 and the second bevel gear 47 are meshed with each other. When the transmission rod 44 rotates, the first bevel gear 46 rotates, which in turn rotates the meshed second bevel gear 47, which in turn rotates the toothed drive gear 50, which is fixedly connected to it. When the transmission rod 44 moves axially, the first bevel gear 46 and the second bevel gear 47 remain meshed, preventing any tooth slip between the first and second bevel gears 46 and 47.

[0048] Preferably, the return spring 74 is located on the side of the first bevel gear 46 near the clutch handle 71. The toothed disc drive gear 50 includes a meshing first drive gear 51 and a second drive gear 52. The first drive gear 51 is fixedly connected to the end of the second bevel gear 47 away from the first bevel gear 46, and the second drive gear 52 is meshed with the open toothed disc 60. It can be understood that compared to providing a large toothed disc drive gear 50, providing the toothed disc drive gear 50 with two meshing first drive gears 51 and second drive gears 52 can reduce the space occupied by the toothed disc drive gear 50, making the transmission structure more compact.

[0049] Furthermore, the pipe welding equipment includes two transmission assemblies 40 and two sets of toothed disc drive gears 50. The opening width of the open toothed disc 60 is smaller than the gear spacing between the two second drive gears 52 to ensure that the open toothed disc 60 will not fall off during rotation and can always maintain the meshing state between the open toothed disc 60 and the second drive gears 52.

[0050] Preferably, the toothed disc drive gear 50 includes, for example, a first drive gear 51 and a second drive gear 52 that are meshed with each other. By configuring the toothed disc drive gear 50 as two meshed gears instead of using one large gear, the size of the pipe welding equipment can be reduced, making the structure of the pipe welding equipment more compact.

[0051] Furthermore, the housing 10 is provided with a toothed disc slot 13, along which the open toothed disc 60 rotates. The toothed disc slot 13 can limit and guide the rotation direction of the open toothed disc 60, thereby ensuring the smooth rotation of the open toothed disc 60. This allows the open toothed disc 60 to drive the welding pin disposed thereon to rotate smoothly, thereby forming a high-quality annular weld at the welding point of the pipeline to be welded, thereby improving the welding quality.

[0052] Furthermore, a plurality of rollers 14 are provided between the open toothed disc 60 and the toothed disc chute 13. When the open toothed disc 60 rotates along the toothed disc chute 13, the rollers 14 can convert the sliding friction between the open toothed disc 60 and the toothed disc chute 13 into rotational friction, thereby reducing the friction between the open toothed disc 60 and the toothed disc chute 13 when the open toothed disc 60 rotates in the toothed disc chute 13, making the open toothed disc 60 rotate more smoothly in the toothed disc chute 13, thereby ensuring that the welding pins provided on the open toothed disc 60 rotate more smoothly, forming a high-quality annular weld at the welding point of the pipeline to be welded, and improving the welding quality.

[0053] Among them, multiple rollers 14 can be installed on the toothed disc groove 13 or on the open toothed disc 60. As long as the rollers 14 can convert the sliding friction between the open toothed disc 60 and the toothed disc groove 13 into rotational friction, the specific setting position is not limited.

[0054] Preferably, multiple rollers 14 are rotatably mounted on the inner wall of the toothed disc slot 13, and a first slot 61 is defined on a side of the open toothed disc 60 adjacent to the rollers 14. When the open toothed disc 60 rotates, the rollers 14 roll along the inner wall of the first slot 61. For example, multiple rotating shafts are evenly distributed on the inner wall of the toothed disc slot 13, and the rollers 14 are rotatably mounted on the rotating shafts.

[0055] In the description of the present invention, it should be understood that the indicated orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0056] Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field and related fields without making creative efforts should fall within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described and explained in the present invention shall be implemented in accordance with conventional means in the field unless otherwise specified or limited.

Claims

1. A pipeline welding device, characterized in that: The pipeline welding equipment comprises: a housing (10), an open toothed disc (60), a driving motor (20), and a transmission part (30); the transmission part (30) is arranged between the driving motor (20) and the open toothed disc (60), and the driving motor (20) drives the open toothed disc (60) through the transmission part (30) to drive the open toothed disc (60) and the welding needle arranged on the open toothed disc (60) to rotate, thereby performing a welding operation on the pipeline; the transmission part (30) comprises a transmission assembly (40) and a toothed disc driving gear (50), and the toothed disc driving gear (50) is meshed with the open toothed disc (60); wherein the driving motor (20) is arranged in the housing (10); and the transmission part (30) transmits the driving force of the driving motor (20) to the toothed disc driving gear (50) and the open toothed disc (60) in the form of a belt drive.

2. The pipeline welding equipment according to claim 1, characterized in that: The transmission assembly (40) comprises: A first transmission gear (41) is provided at the output end of the driving motor (20); A transmission rod (44) is connected to the toothed disc drive gear (50); a second transmission gear (42), disposed on the transmission rod (44); a synchronous belt (43) for transmission connection between the first transmission gear (41) and the second transmission gear (42); The driving motor (20) can drive the synchronous belt (43) and the second transmission gear (42) to rotate via the first transmission gear (41), thereby driving the transmission rod (44) to rotate and transmitting the driving force to the toothed disc driving gear (50).

3. The pipeline welding equipment according to claim 2, characterized in that: The transmission assembly (40) further includes: The synchronous belt tensioning structure is arranged on the outside of the synchronous belt (43).

4. The pipeline welding equipment according to claim 2, characterized in that: The pipeline welding equipment also includes: a clutch assembly (70) disposed between the first transmission gear (41) and the output end of the drive motor (20); a clutch handle (71), disposed outside the housing (10) and connected to a side of the first transmission gear (41) away from the output end of the drive motor (20); When the drive motor (20) is turned off, the clutch handle (71) can be pulled to cut off the power transmitted from the output end of the drive motor (20) to the transmission assembly (40), so as to manually reset the open toothed disc (60).

5. The pipeline welding equipment according to claim 4, characterized in that: The clutch assembly (70) comprises: A first spline (72) is provided at the output end of the drive motor (20); A second spline (73) is provided on the mounting shaft of the first transmission gear (41) and cooperates with the first spline (72) to realize power transmission or power cutoff between the drive motor (20) and the first transmission gear (41).

6. The pipeline welding equipment according to claim 4, characterized in that: The pipeline welding equipment also includes: a return spring (74), arranged on the transmission rod (44); When the clutch handle (71) is pulled, the first transmission gear (41) can drive the synchronous belt (43), the second transmission gear (42) and the transmission rod (44) to move in a direction close to the clutch handle (71), and the return spring (74) is compressed; when the external force acting on the clutch handle (71) is released, the return elastic force of the return spring (74) can drive the transmission assembly (40) to return to its initial position.

7. The pipeline welding equipment according to claim 6, characterized in that: The pipeline welding equipment also includes: a bevel gear assembly disposed between the transmission rod (44) and the toothed disc drive gear (50); The transmission rod (44) drives the toothed disc driving gear (50) to rotate via the bevel gear assembly.

8. The pipeline welding equipment according to claim 7, characterized in that: The bevel gear assembly comprises: a first bevel gear (46) disposed on the transmission rod (44); A second bevel gear (47) fixedly connected to the toothed disc drive gear (50); The first bevel gear (46) is meshed with the second bevel gear (47) to transmit the driving force at the transmission rod (44) to the toothed disc driving gear (50).

9. The pipeline welding equipment according to claim 8, characterized in that: The return spring (74) is located on a side of the first bevel gear (46) close to the clutch handle (71).

10. The pipeline welding equipment according to any one of claims 1 to 9, characterized in that: The pipeline welding equipment comprises two transmission assemblies (40) and two toothed disc drive gears (50); wherein the opening width of the open toothed disc (60) is smaller than the gear spacing of the two toothed disc drive gears (50).

11. The pipeline welding equipment according to any one of claims 1 to 9, characterized in that: The housing (10) is provided with a toothed disc sliding groove (13), and the open toothed disc (60) rotates along the toothed disc sliding groove (13).

12. The pipeline welding equipment according to claim 11, characterized in that: The pipeline welding equipment also includes: A plurality of rollers (14) are arranged between the open toothed disc (60) and the toothed disc sliding groove (13) and are used to reduce the friction force when the open toothed disc (60) rotates in the toothed disc sliding groove (13).

13. The pipeline welding equipment according to claim 12, characterized in that: The plurality of rollers (14) are rotatably mounted on the inner wall of the toothed disc slide groove (13), and a first slide groove (61) is provided on a side of the open toothed disc (60) close to the rollers (14); wherein, when the open toothed disc (60) rotates, the rollers (14) roll along the inner wall of the first slide groove (61).

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