CN117340661A - Novel intelligent tool magazine and numerical control machine tool using same - Google Patents

Abstract

The invention relates to the technical field of numerical control machine tools, in particular to a novel intelligent tool magazine and a numerical control machine tool using the tool magazine. The tool magazine tool storage device solves the problems that in the prior art, the tool magazine tool storage amount is small, and tool setting is inaccurate in the tool magazine tool conveying process. The structure comprises a base, a cross beam of a -shaped structure is fixed on the base, an engraving module for engraving and processing parts is arranged on one side of the cross beam, a tool magazine module for providing replacement tools for the engraving module is arranged on the other side of the base, which is close to the cross beam, a plurality of tool handles are arranged in the tool magazine module, the tool handles are connected with the tools in a threaded manner, a first sliding rail is arranged between the tool magazine module and the engraving module, and a first transportation module for transporting the tools in the tool magazine module to the engraving module is connected to the first sliding rail in a sliding manner. The tool handle can fall into the main shaft or the positioning groove only by approaching the tool handle, and the center of the tool handle is not required to be completely aligned with the center, so that the positioning difficulty is reduced.

Description

Novel intelligent tool magazine and numerical control machine tool using same

Technical Field

The invention relates to the technical field of numerical control machine tools, in particular to a novel intelligent tool magazine and a numerical control machine tool using the tool magazine.

Background

The numerical control machine tool is short for numerical control machine tool, and is an automatic machine tool with a program control system. It does not require a worker to directly operate the machine tool, but performs machining by programming the machining program. In the machining process, the cutter is often replaced due to the machining precision required by different parts. Therefore, the tool magazine is arranged on the numerical control machine tool, so that the method becomes an indispensable choice of a machining factory.

The numerical control machine in the prior art takes a CNC machine and an CNC machine as an example, a tool magazine with an in-line structure is additionally arranged on the CNC machine, a tool rest is arranged on the tool magazine, when tools need to be replaced, the tools needing to be replaced are firstly moved to the tool rest from a main shaft, then the tool magazine and the tool rest to be used are moved to a position close to the main shaft of the CNC machine, then the main shaft of the CNC machine is moved, the original tools on the main shaft are placed in a vacancy, and finally the tools needing to be additionally arranged in the tool magazine are installed on the main shaft to complete tool replacement operation. Such a numerical control machine tool has the following problems due to the need to move the entire magazine: 1. the size of the tool magazine is limited by the size of the engraving and milling platform, and the tool magazine can not store more tools; 2. the tool in the tool magazine is easy to shake in the moving process, and the tool is easy to incline, so that the main shaft is inaccurate in tool selection and tool setting, and errors are generated in tool machining.

Disclosure of Invention

The invention provides a novel intelligent tool magazine and a numerical control machine tool using the tool magazine, which solve the problems of small tool magazine tool storage amount and inaccurate tool setting generated in the tool magazine tool conveying process in the prior art.

The technical scheme of the invention is as follows:

a novel intelligent tool magazine and a numerical control machine tool using the tool magazine, which comprises a base,

be fixed with the crossbeam of "" shape structure on the base, crossbeam one side is equipped with the cnc engraving module that is used for cnc engraving and milling parts, the opposite side that the base is close to the crossbeam is equipped with the tool magazine module that is used for providing the change cutter for cnc engraving module, be equipped with a plurality of handles in the tool magazine module, threaded connection has the cutter on the handle of a knife, be equipped with first slide rail between tool magazine module and the cnc engraving module, slide on the first slide rail and be connected with the first transport module that is used for transporting the cutter in the tool magazine module to cnc engraving module, be equipped with the second transport module that is used for removing the cutter in the tool magazine module to first transport module between first transport module and the tool magazine module.

Further, the cnc engraving and milling module comprises a main shaft which is fixedly connected with the cutter handle in a clamping mode, a second sliding rail which is connected with the main shaft in a sliding mode along an X-axis is arranged on the cross beam, a workbench is arranged on the lower side of the main shaft, and the workbench is connected with the first sliding rail in a sliding mode.

Further, the tool magazine module comprises a bearing table fixedly connected with the base, a mounting groove is formed in the bearing table, a tool rest is fixedly arranged in the mounting groove, and a plurality of through holes for placing tools are formed in the tool rest.

Further, the first transportation module comprises a sliding frame which is connected with the first sliding rail in a sliding manner, the section of the sliding frame is of a 'back' structure, a tool rest is fixed on the sliding frame, a tool holder is arranged on the tool rest, and two clamping holes with the same diameter as the through holes are formed in the tool holder.

Further, the second transport module comprises a cross arm fixedly connected with the cross beam, a third sliding rail is arranged on the cross arm, a longitudinal arm is connected to the third sliding rail in a sliding mode along the Y-axis direction, a fourth sliding rail is arranged on the longitudinal arm, a sliding seat is connected to the fourth sliding rail in a sliding mode along the X-axis direction, a fifth sliding rail is arranged on the sliding seat, an upper arm is connected to the fifth sliding rail in a sliding mode along the Z-axis direction, and a clamping structure for clamping the cutter handle is fixed to the lower end of the upper arm.

Further, the clamping structure comprises a mounting bracket which is fixedly mounted with the upper arm through a bolt, a sliding groove is formed in the lower side of the mounting bracket, a first clamping jaw finger and a second clamping jaw finger are slidably connected in the sliding groove, and a cylinder for driving the first clamping jaw finger and the second clamping jaw finger to be close to or separated from each other is further fixed on the mounting bracket.

Further, the handle of a knife includes the link of being connected with the cutter and is used for installing the installation end of handle of a knife, the link is cylindrical structure, be equipped with the screw thread groove on the link, the screw thread groove passes through threaded connection with the cutter and fixes, be equipped with the annular on the lateral wall of installation end.

Further, the installation end is the round platform shape structure, the cross section diameter that the installation end is close to the link is greater than the cross section diameter of keeping away from the link, be equipped with the constant head tank on the fixture, the both sides of constant head tank set up respectively on first clamping jaw finger and second clamping jaw finger, constant head tank notch diameter is greater than constant head tank bottom diameter, the constant head tank bottom is equipped with the draw-in hole, the draw-in hole diameter is greater than the annular diameter, and is less than the terminal surface diameter of installation end.

Further, the connecting end is close to the first limiting plate and the second limiting plate are further arranged on the side wall of the mounting end, a distance is arranged between the first limiting plate and the second limiting plate, limiting grooves which are slidably connected with the first limiting plate and the second limiting plate are formed in the ports of the locating grooves and the through holes, the diameter of each limiting groove is larger than that of each locating groove and the corresponding through hole, and first locating chamfers are arranged on the notch of each limiting groove.

Further, still be equipped with the swivel facial features between first limiting plate and the second limiting plate, the link is kept away from the installation end side and still is equipped with the second location chamfer.

The working principle and the beneficial effects of the invention are as follows:

1. according to the invention, the first conveying module and the second conveying module are arranged between the tool magazine module and the engraving module, when the tool magazine is required to be replaced, the workbench is firstly moved away, then the clamping mechanism on the second conveying module is conveyed to a position close to the tool to be replaced, the tool is grasped through the clamping mechanism, the tool is placed at the clamping hole on the first conveying module, the first conveying module is driven to convey the tool to the lower part of the main shaft, at the moment, the main shaft places the original tool at the other clamping hole, and the conveyed tool is clamped and fixed, so that the tool replacing process is completed. According to the invention, the tool magazine module is fixedly arranged on the base, so that the situation that the main shaft selects tools and pairs of tools are inaccurate due to shaking of the tools on the tool magazine module caused by transportation is avoided, the tool magazine can select the number of the tools to be placed according to actual needs, and the tool magazine can accommodate too many tools;

2. the mounting end of the tool handle adopts a round platform structure, so that the tool handle can be moved towards the center more and more along with the deep movement of the tool handle towards the main shaft or the positioning groove when the tool handle is close to the positioning groove of the main shaft or the clamping mechanism. The tool handle can fall into the main shaft or the positioning groove only by approaching the tool handle, and the center of the tool handle is not required to be completely aligned with the center, so that the positioning difficulty is reduced.

Drawings

The invention will be described in further detail with reference to the drawings and the detailed description.

FIG. 1 is a schematic diagram of the whole structure of the present embodiment;

FIG. 2 is a schematic diagram of the whole structure of the second embodiment;

fig. 3 is a schematic diagram of the whole structure of the third embodiment;

fig. 4 is a schematic diagram of a tool magazine module in the present embodiment;

FIG. 5 is a schematic diagram of a second transport module according to the present embodiment;

fig. 6 is a second schematic structural diagram of a second transport module in the present embodiment;

fig. 7 is a schematic view of the first transport module structure in the present embodiment;

FIG. 8 is a schematic view of the structure of the clamping structure in the present embodiment;

FIG. 9 is a schematic view of the structure of the tool shank in the present embodiment;

fig. 10 is a schematic diagram of a tool magazine module structure in this embodiment, which is used to show the structure of the through hole.

In the figure:

1. a base; 2. a cross beam; 3. a first slide rail; 4. a work table; 5. a tool magazine module; 6. a second transport module; 7. a main shaft; 8. a knife handle; 9. a first transport module; 51. a carrying platform; 52. a mounting groove; 53. a through hole; 54. a limit groove; 55. a first positioning chamfer; 71. a second slide rail; 61. a cross arm; 611. a third slide rail; 62. a trailing arm; 621. a fourth slide rail; 63. an upper arm; 641. a mounting bracket; 642. a first jaw finger; 643. a second jaw finger; 644. a chute; 645. a cylinder; 646. a positioning groove; 647. a clamping hole; 65. a sliding seat; 81. a connection end; 82. a mounting end; 83. a ring groove; 84. a first limiting plate; 85. a second limiting plate; 86. a rotating surface; 87. a second positioning chamfer; 88. a thread groove; 89. a cutter; 651. a fifth slide rail; 64. a clamping mechanism; 91. a sliding frame; 92. placing a tool rest; 93. a tool holder is arranged; 94. and (5) clamping holes.

Detailed Description

The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Example 1

As shown in fig. 1 to 10, this embodiment provides a novel intelligent tool magazine and a numerical control machine using the tool magazine, which includes a base 1.

The cross beam 2 is fixedly arranged on the base 1, and has a shape of . The engraving module is arranged on one side of the beam 2 and is used for engraving and processing parts. The tool magazine module 5 is arranged on the other side of the base 1, which is close to the cross beam 2, and is used for providing the engraving and milling module with a replacement tool 89. The first transporting module 9 is slidably connected with the first sliding rail 3, and is used for transporting the cutter 89 in the tool magazine module 5 to the engraving and milling module. The second transport module 6 is arranged between the first transport module 9 and the magazine module 5, and is used for moving the tools 89 in the magazine module 5 to the first transport module 9. The tool magazine module 5 is internally provided with a plurality of tool shanks 8, a tool 89 is in threaded connection with the tool shanks 8, and the first sliding rail 3 is arranged between the tool magazine module 5 and the engraving and milling module. In this embodiment, a channel is arranged at the lower end of the cross beam 2, and the first sliding rail 3 passes through the channel, so that the engraving and milling module is communicated with the tool magazine module 5. This design makes the structure of this embodiment more compact.

The tool magazine module 5 in this embodiment includes a carrying table 51 fixedly connected to the base 1, a mounting groove 52 provided on the carrying table 51, a tool holder 92 provided in the mounting groove 52, and a plurality of through holes 53 provided on the tool holder 92 for holding tools 89. The number of the through holes 53 may be set according to the kind of the cutter 89 required for actual production. In the embodiment, the cutter 89 is placed by adopting a fixed cutter placing frame 92 mode, and the cutter 89 on the cutter placing frame 92 cannot deviate due to the fact that the cutter placing frame 92 does not move, so that the cutter conveying and changing links are more accurate.

The engraving and milling module in this embodiment includes a main shaft 7, which is fastened and fixed to the tool shank 8, and a second slide rail 71 is provided on the cross beam 2, which is slidably connected to the main shaft 7 along the X axis. The workstation 4 sets up in main shaft 7 downside, and workstation 4 slides with first slide rail 3 and is connected. In the embodiment, the spindle 7 realizes X-axis engraving through the second sliding rail 71, and realizes Y-axis engraving through sliding connection of the workbench 4 and the first sliding rail 3. The present embodiment preferably uses a hydraulic or pneumatic cylinder to drive the spindle 7 along the X axis. The present embodiment preferably uses a hydraulic or pneumatic cylinder to drive the table 4 along the Y-axis.

The first transport module 9 in this embodiment comprises a skid 91 which is in skid connection with the first skid 3. The cross section of the sliding frame 91 is in a 'back' structure, the tool holder 92 is fixedly connected to the sliding frame 91, the tool holder 93 is arranged on the tool holder 92, the clamping holes 94 are arranged on the tool holder 93, the number of the clamping holes is two, and the diameter of the clamping holes is the same as that of the through holes 53. The cross section of the sliding frame 91 is in a 'back' structure, so that the material is saved and the cost is reduced while the strength of the sliding frame 91 is ensured.

In this embodiment, two clamping holes 94 are designed to facilitate tool changing, and when the tool is changed, the original tool 89 is placed into one clamping hole 94, and then the tool 89 on the other clamping hole 94 is changed. In this embodiment, a tool setting gauge and a proximity sensor may be fixedly disposed on the sliding frame 91, so as to improve the accuracy of the tool 89 entering the clamping hole 94. The tool setting gauge and the proximity sensor are both in the prior art, and the embodiment is not repeated.

The second transport module 6 in this embodiment includes a cross arm 61 fixedly connected with the cross beam 2, a third sliding rail 611 is disposed on the cross arm 61, a trailing arm 62 is slidably connected with the third sliding rail 611 along the Y-axis direction, a fourth sliding rail 621 is disposed on the trailing arm 62, a sliding seat 65 is slidably connected with the fourth sliding rail 621 along the X-axis direction, a fifth sliding rail 651 is disposed on the sliding seat 65, an upper arm 63 is slidably connected on the fifth sliding rail 651 along the Z-axis direction, and a clamping structure is fixed at the lower end of the upper arm 63 for clamping the tool shank 8. In this embodiment, displacement of the clamping structure relative to the X axis, the Y axis and the Z axis is adjusted by displacement of the trailing arm 62, the cross arm 61 and the upper arm 63, so as to grasp the tools 89 at different positions of the tool magazine. Therefore, the number of the cutters 89 on the cutter magazine can be set according to actual needs, and meanwhile, the capacity of the cutter magazine storing cutters 89 in the embodiment is increased.

The clamping structure in this embodiment includes a mounting bracket 641 which is fixedly mounted to the upper arm 63 by a bolt, a slide groove 644 is provided at the lower side of the mounting bracket 641, a first clamping jaw finger 642 and a second clamping jaw finger 643 are slidably connected to the slide groove 644, and a cylinder 645 which drives the first clamping jaw finger 642 and the second clamping jaw finger 643 toward each other or away from each other is further fixed to the mounting bracket 641. The present embodiment may also provide a proximity sensor on the mounting bracket 641 that may be used to more accurately position the first and second jaw fingers 642, 643 to the grasping knife 89.

The tool holder 8 in this embodiment includes a connecting end 81 and a mounting end 82, the connecting end 81 is connected with a cutter 89, the mounting end 82 is used for mounting the tool holder 8, a thread groove 88 is provided on the connecting end 81, the thread groove 88 is fixed with the cutter 89 through threaded connection, a ring groove 83 is provided on a side wall of the mounting end 82, and the connecting end 81 is of a cylindrical structure. In the embodiment, the cutter 89 is provided with the threads, the cutter 89 is fixedly connected with the cutter handle 8 through the threads, and the connection mode is firmer. The ring groove 83 of the mounting end 82 in this embodiment is designed to fasten the mounting end 82.

The clamping mechanism 64 in this embodiment is provided with a positioning groove 646, two sides of the positioning groove 646 are respectively arranged on a first clamping jaw finger 642 and a second clamping jaw finger 643, the diameter of a groove opening of the positioning groove 646 is larger than that of the groove bottom of the positioning groove 646, a clamping hole 647 is formed in the groove bottom of the positioning groove 646, the diameter of the clamping hole 647 is larger than that of the annular groove 83 and smaller than that of the end face of the mounting end 82, the mounting end 82 is in a circular truncated cone structure, and the diameter of a cross section of the mounting end 82 close to the connecting end 81 is larger than that of a cross section far away from the connecting end 81. In this embodiment, the mounting end 82 adopts a truncated cone-shaped structure, and the positioning groove 646 has a groove opening diameter larger than the groove bottom diameter of the positioning groove 646, so that when the mounting end 82 enters the positioning groove 646, the groove bottom of the positioning groove 646 can be scratched through the side wall of the truncated cone, and the center of the positioning groove 646 can be aligned with the center of the mounting end 82, which also enables the first clamping jaw finger 642 and the second clamping jaw finger 643 to clamp the position of the tool handle 8 more accurately.

A space is provided between the first limiting plate 84 and the second limiting plate 85 in this embodiment, and the first limiting plate 84 and the second limiting plate 85 are disposed on a side wall of the connection end 81 near the mounting end 82. The limiting groove 54 is disposed on the end ports of the positioning groove 646 and the through hole 53, and is slidably connected with the first limiting plate 84 and the second limiting plate 85, and the diameter of the limiting groove 54 is larger than the diameters of the positioning groove 646 and the through hole 53. When the connecting end 81 is placed in the positioning groove 646 or the through hole 53, the second limiting plate 85 is abutted with the limiting groove 54, and the first limiting plate 84 is also abutted on the side wall of the limiting groove 54, so that when the cutter handle 8 is placed in the positioning groove 646 or the through hole 53, the cutter handle 8 cannot shake or incline, and the problem of inaccurate cutter changing position occurs during cutter changing.

The rotation surface 86 in this embodiment is disposed between the first limiting plate 84 and the second limiting plate 85, and the connection end 81 is further provided with a second positioning chamfer 87 on the side away from the mounting end 82. When the tool shank 8 approaches the positioning groove 646 or the through hole 53, the first positioning chamfer 55 and the second positioning chamfer 87 are in preferential contact, so that the connecting end 81 of the tool shank 8 can enter the positioning groove 646 or the through hole 53 more easily, and the difficulty of entering the tool shank 8 into the through hole 53 is reduced. The rotary surface 86 is provided to enable the spindle 7 to rotate the tool shank 8 when the tool shank 8 is mounted in the spindle 7.

The working procedure of this embodiment is: when the engraving and milling module needs to replace the cutter 89, the first conveying mechanism is firstly slid to a position close to the cutter magazine, meanwhile, the workbench 4 of the engraving and milling module is slid away from the spindle 7, the cutter 89 which needs to be replaced is grabbed from the cutter magazine through displacement of the longitudinal arm 62, the transverse arm 61 and the upper arm 63 and is placed on the clamping hole 94 on the first conveying tool, then the first conveying tool is made to be close to the spindle 7 through sliding of the first conveying tool, the spindle 7 places the original cutter 89 on the other clamping hole 94 on the first conveying tool, clamps the conveyed cutter 89, finally slides the first conveying tool to a position close to the cutter magazine, and moves the workbench 4 back to the lower end of the spindle 7, and the cutter replacing work is completed.

The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.

Claims (10)

1. Novel intelligent tool magazine and use digit control machine tool of this tool magazine, including base (1), its characterized in that:

be fixed with crossbeam (2) of "" shape structure on base (1), crossbeam (2) one side is equipped with the cnc engraving module that is used for cnc engraving processing part, base (1) is close to the opposite side of crossbeam (2) and is equipped with tool magazine module (5) that are used for providing change cutter (89) for cnc engraving module, be equipped with a plurality of handle of a knife (8) in tool magazine module (5), threaded connection has cutter (89) on handle of a knife (8), be equipped with first slide rail (3) between tool magazine module (5) and the cnc engraving module, slide on first slide rail (3) and be connected with first transport module (9) that are used for carrying cutter (89) in tool magazine module (5) to cnc engraving module, be equipped with between first transport module (9) and tool magazine module (5) and be used for removing cutter in tool magazine module (5) to second transport module (6) of first transport module (9).

2. The novel intelligent tool magazine and the numerical control machine tool using the tool magazine according to claim 1, characterized in that the engraving and milling module comprises a main shaft (7) which is fixedly clamped with a tool handle (8), a second sliding rail (71) which is slidably connected with the main shaft (7) along an X axis is arranged on the cross beam (2), a workbench (4) is arranged on the lower side of the main shaft (7), and the workbench (4) is slidably connected with the first sliding rail (3).

3. The novel intelligent tool magazine and the numerical control machine tool using the tool magazine according to claim 1, wherein the tool magazine module (5) comprises a bearing table (51) fixedly connected with the base (1), a mounting groove (52) is formed in the bearing table (51), a tool rest (92) is fixedly arranged in the mounting groove (52), and a plurality of through holes (53) for placing tools (89) are formed in the tool rest (92).

4. The novel intelligent tool magazine and the numerical control machine tool using the same according to claim 3, wherein the first transportation module (9) comprises a sliding frame (91) which is connected with the first sliding rail (3) in a sliding mode, the section of the sliding frame (91) is of a 'back' structure, a tool rest (92) is fixed on the sliding frame (91), a tool holder (93) is arranged on the tool rest (92), and two clamping holes (94) with the same diameter as the through holes (53) are formed in the tool holder (93).

5. The novel intelligent tool magazine and the numerical control machine tool using the same according to claim 4, wherein the second transportation module (6) comprises a cross arm (61) fixedly connected with the cross beam (2), a third sliding rail (611) is arranged on the cross arm (61), a longitudinal arm (62) is connected to the third sliding rail (611) in a sliding manner along the Y-axis direction, a fourth sliding rail (621) is arranged on the longitudinal arm (62), a sliding seat (65) is connected to the fourth sliding rail (621) in a sliding manner along the X-axis direction, a fifth sliding rail (651) is arranged on the sliding seat (65), an upper arm (63) is connected to the fifth sliding rail (651) in a sliding manner along the Z-axis direction, and a clamping structure for clamping the tool holder (8) is fixed at the lower end of the upper arm (63).

6. The novel intelligent tool magazine and the numerical control machine using the same according to claim 5, wherein the clamping structure comprises a mounting bracket (641) which is fixedly mounted on an upper arm (63) through bolts, a sliding groove (644) is formed in the lower side of the mounting bracket (641), a first clamping jaw finger (642) and a second clamping jaw finger (643) are slidably connected in the sliding groove (644), and an air cylinder (645) for driving the first clamping jaw finger (642) and the second clamping jaw finger (643) to be close to or separated from each other is further fixed on the mounting bracket (641).

7. The novel intelligent tool magazine and the numerical control machine tool using the same according to claim 6, wherein the tool shank (8) comprises a connecting end (81) connected with a tool (89) and a mounting end (82) used for mounting the tool shank (8), the connecting end (81) is of a cylindrical structure, a thread groove (88) is formed in the connecting end (81), the thread groove (88) is fixedly connected with the tool (89) through threads, and a ring groove (83) is formed in the side wall of the mounting end (82).

8. The novel intelligent tool magazine and the numerical control machine using the same according to claim 7, wherein the installation end (82) is of a truncated cone-shaped structure, the cross section diameter of the installation end (82) close to the connection end (81) is larger than the cross section diameter of the installation end (81), the clamping mechanism (64) is provided with positioning grooves (646), two sides of each positioning groove (646) are respectively arranged on the first clamping jaw finger (642) and the second clamping jaw finger (643), the notch diameter of each positioning groove (646) is larger than the groove bottom diameter of each positioning groove (646), the groove bottom of each positioning groove (646) is provided with a clamping hole (647), and the diameter of each clamping hole (647) is larger than the diameter of the annular groove (83) and smaller than the end surface diameter of the installation end (82).

9. The novel intelligent tool magazine and the numerical control machine tool using the same according to claim 8, wherein the connecting end (81) is close to the side wall of the mounting end (82) and is further provided with a first limiting plate (84) and a second limiting plate (85), a distance is arranged between the first limiting plate (84) and the second limiting plate (85), the ports of the locating groove (646) and the through hole (53) are respectively provided with a limiting groove (54) which is in sliding connection with the first limiting plate (84) and the second limiting plate (85), the diameter of the limiting groove (54) is larger than the diameters of the locating groove (646) and the through hole (53), and the notch of the limiting groove (54) is provided with a first locating chamfer (55).

10. The novel intelligent tool magazine and the numerical control machine tool using the same according to claim 9, wherein a rotating surface (86) is further arranged between the first limiting plate (84) and the second limiting plate (85), and a second positioning chamfer (87) is further arranged on the side, far away from the mounting end (82), of the connecting end (81).