Quick tool changing structure suitable for numerical control machine tool and operation method of quick tool changing structure

Abstract

The invention belongs to the technical field of numerical control machine tools, and particularly relates to a quick tool changing structure suitable for a numerical control machine tool and an operation method thereof.The quick tool changing structure comprises a base, a tool apron is arranged over the base, a plurality of tools are arranged on the tool apron, the quick tool changing structure further comprises a bearing assembly used for supporting the tool apron, and the bearing assembly is arranged between the base and the tool apron; the fixing assembly is used for fixing the tool and is arranged on the tool apron; the driving assembly is used for enabling the bearing assembly and the fixing assembly to operate independently, the driving assembly is arranged on the base, the fixing assembly is arranged to fix a cutter, workers can conveniently disassemble and assemble the cutter, then time can be saved, and rapid replacement of the cutter is achieved; and synchronous double fixing of the cutter can be achieved, time is further saved, and the mounting stability of the cutter is improved to the first extent.

Description

Technical Field

[0001] The invention relates to the technical field of numerically controlled machine tools, and in particular to a rapid tool changing structure suitable for numerically controlled machine tools and an operating method thereof. Background Art

[0002] The CNC tool rest is the most common auxiliary device for CNC machine tools. It enables CNC lathes to complete multiple or even all machining processes in one clamping of the workpiece, thereby shortening the auxiliary time of machining, reducing the errors caused by multiple installations of the workpiece during machining, and improving the machining efficiency and machining accuracy of the machine tool. The CNC tool rest is designed to hold the tool firmly to ensure the stability and accuracy of the tool during machining. It is an important part of the CNC lathe, and its structure and function are crucial to improving machining quality and efficiency.

[0003] At present, the tool on the CNC tool holder is usually fixed by screws, which results in that when the tool is disassembled and assembled, multiple screws need to be screwed one by one, which wastes time. Therefore, a quick tool changing structure suitable for CNC machine tools and an operating method thereof are invented. Summary of the invention

[0004] In view of the above and / or existing problems in a fast tool changing structure applicable to a numerically controlled machine tool and an operating method thereof, the present invention is proposed.

[0005] Therefore, the object of the present invention is to provide a rapid tool change structure suitable for a CNC machine tool and an operating method thereof, which can solve the above-mentioned existing problems.

[0006] To solve the above technical problems, according to one aspect of the present invention, the present invention provides the following technical solutions:

[0007] A quick tool changing structure suitable for a numerically controlled machine tool comprises a base, a tool holder is arranged directly above the base, a plurality of tools are arranged on the tool holder, and further comprises:

[0008] A bearing assembly for supporting the knife seat, and the bearing assembly is arranged between the base and the knife seat;

[0009] A fixing component for fixing the tool, and the fixing component is arranged on the tool holder;

[0010] A driving assembly is used to enable the bearing assembly and the fixing assembly to operate independently, and the driving assembly is arranged on the base.

[0011] As a preferred solution of a quick tool change structure applicable to a CNC machine tool described in the present invention, the bearing assembly includes:

[0012] A hollow tube, wherein the hollow tube is fixedly mounted on the top of the base;

[0013] An annular groove, wherein the annular groove is formed on the top end of the hollow tube;

[0014] An annular plate, the annular plate is fixedly mounted on the bottom of the knife seat, and the annular plate is slidably connected to the top of the annular groove;

[0015] A first rotating shaft is fixedly mounted on the bottom middle end of the knife seat.

[0016] As a preferred solution of the rapid tool change structure applicable to CNC machine tools described in the present invention, the bearing assembly further comprises:

[0017] A first box body, wherein the first box body is fixedly mounted on the bottom of the annular plate;

[0018] A first cylinder, wherein the first cylinder is fixedly installed in the first box body;

[0019] The first extrusion plate is fixedly mounted on the first cylinder via a piston rod, and the first extrusion plate is in close contact with the bottom end of the annular groove.

[0020] As a preferred solution of a quick tool change structure applicable to a CNC machine tool described in the present invention, the fixing component comprises:

[0021] A fourth rotating shaft, the fourth rotating shaft being rotatably connected to the bottom end of the knife seat through a bearing;

[0022] A pressure plate, the pressure plate is fixedly mounted on the bottom of the fourth rotating shaft;

[0023] a first square groove, wherein the first square groove is provided in the fourth rotating shaft;

[0024] a first square rod, the first square rod being slidably connected in the first square slot;

[0025] A first stud, wherein the first stud is fixedly mounted on the top of the first square rod and the first stud is threadedly connected to the top of the knife seat;

[0026] A thread groove is provided on the bottom end of the tool, and the top end of the first stud is threadedly connected in the thread groove.

[0027] As a preferred solution of the rapid tool change structure applicable to CNC machine tools described in the present invention, the fixing assembly further comprises:

[0028] A fifth rotating shaft, the fifth rotating shaft being rotatably connected to the bottom end of the knife seat through a bearing;

[0029] a second square groove, wherein the second square groove is provided in the fifth rotating shaft;

[0030] a second square rod, the second square rod being slidably connected in the second square slot;

[0031] A second stud, wherein the second stud is fixedly mounted on the top of the second square rod and the second stud is threadedly connected to the top of the knife seat;

[0032] A lifting plate, the top of the second stud is rotatably connected to the lifting plate;

[0033] A positioning rod, the positioning rod is fixedly mounted on one side of the bottom of the lifting plate;

[0034] A positioning groove, wherein the positioning groove is formed on the top of the knife seat, and the bottom end of the positioning rod passes through the knife and is inserted into the positioning groove;

[0035] A guide rod is fixedly mounted on the other side of the bottom of the lifting plate, and is slidably connected to the top end of the knife seat.

[0036] As a preferred solution of the rapid tool change structure applicable to CNC machine tools described in the present invention, the fixing assembly further comprises:

[0037] a first sprocket, wherein the first sprocket is fixedly mounted on the fifth rotating shaft;

[0038] a second sprocket, the second sprocket being fixedly mounted on a fourth rotating shaft;

[0039] Chain, the first sprocket and the second sprocket are connected by chain transmission.

[0040] As a preferred solution of the rapid tool change structure applicable to CNC machine tools described in the present invention, the fixing assembly further comprises:

[0041] A limit block, the limit block is fixedly mounted on the top of the knife seat;

[0042] A limiting groove is provided on the bottom end of the tool, and a limiting block is inserted into the limiting groove.

[0043] As a preferred solution of a fast tool changing structure applicable to a CNC machine tool described in the present invention, the driving assembly comprises:

[0044] A box body, wherein the box body is fixedly mounted on the top of the base;

[0045] A servo motor, wherein the servo motor is fixedly installed in the box;

[0046] A second rotating shaft, the second rotating shaft is fixedly mounted on the output shaft of the servo motor;

[0047] A first pulley, wherein the first pulley is fixedly mounted on the second rotating shaft;

[0048] A third rotating shaft, the third rotating shaft being rotatably connected to the middle portion of the base through a bearing;

[0049] a second pulley, the second pulley being fixedly mounted on the third rotating shaft;

[0050] The first pulley and the second pulley are connected by belt transmission.

[0051] As a preferred solution of the rapid tool change structure applicable to CNC machine tools described in the present invention, the drive assembly further includes:

[0052] A second box body, wherein the second box body is fixedly mounted on the top of the second rotating shaft;

[0053] a second cylinder, the second cylinder being fixedly mounted in the second box body;

[0054] A second extrusion plate, the second cylinder is fixedly mounted with the second extrusion plate via a piston rod, and a pressure plate is provided directly above the second extrusion plate;

[0055] A third box body, the third box body is fixedly mounted on the top of the third rotating shaft;

[0056] A third cylinder, the third cylinder being fixedly installed in the third box body;

[0057] The third extrusion plate is fixedly mounted on the third cylinder via a piston rod, and a first rotating shaft is arranged directly above the third extrusion plate.

[0058] An operating method for a quick tool change structure suitable for a CNC machine tool comprises the following specific steps:

[0059] Step 1: Rotate the second rotating shaft and the third rotating shaft by a servo motor;

[0060] Step 2: If the angle of the tool holder needs to be adjusted, the third extrusion plate is moved toward the first rotating shaft by the third cylinder until the third extrusion plate extrudes the first rotating shaft. At this time, the first rotating shaft drives the tool holder to rotate until the tool holder is at a suitable horizontal angle. After that, the first extrusion plate is extruded on the annular groove by the first cylinder, so that the horizontal angle of the tool holder can be fixed;

[0061] Step three: When installing the tool, insert the limit block into the limit groove to locate the position of the tool. Then, use the second cylinder to make the second extrusion plate squeeze the pressure plate. At this time, the fourth shaft will drive the first stud to rotate so that the top thread of the first stud is connected to the thread groove. At the same time, when the fourth shaft rotates, the second stud will also be driven to rotate through the fifth shaft. When the second stud rotates, it will drive the lifting plate to descend until the positioning rod passes through the tool and is inserted into the positioning groove. At this point, the tool can be installed.

[0062] Compared with existing technologies:

[0063] 1. Fixing the tool by setting a fixing component can facilitate personnel to disassemble and assemble the tool, thereby saving time and realizing quick replacement of the tool. In addition, the fixing component set can also realize dual fixation of the tool simultaneously, which not only further saves time, but also improves the installation stability of the tool to the first degree.

[0064] 2. By providing a driving assembly for independently operating the bearing assembly and the fixing assembly, it is possible to operate the bearing assembly and the fixing assembly with only one set of motors, thereby reducing the cost investment to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0065] Figure 1 It is a front view schematic diagram of the structure of the present invention;

[0066] Figure 2 It is a schematic front view of a local structure of the present invention;

[0067] Figure 3 For the present invention Figure 2 A schematic diagram of the structure enlargement in the middle;

[0068] Figure 4 It is a top view schematic diagram of the knife holder of the present invention;

[0069] Figure 5 It is a top view schematic diagram of the hollow tube and the annular groove of the present invention;

[0070] Figure 6 It is a bottom view schematic diagram of the annular plate and the first extrusion plate of the present invention.

[0071] In the figure: base 10, knife seat 20, hollow tube 30, annular groove 31, annular plate 32, first box body 33, first cylinder 34, first extrusion plate 35, first rotating shaft 36, box body 40, servo motor 41, second rotating shaft 42, first pulley 43, third rotating shaft 44, second pulley 45, belt 46, second box body 47, second cylinder 48, second extrusion plate 49, third box body 491, third cylinder 492, third Extrusion plate 493, fourth rotating shaft 50, pressure plate 51, first square groove 52, first square rod 53, first stud 54, threaded groove 55, fifth rotating shaft 56, second square groove 57, second square rod 58, second stud 59, lifting plate 591, positioning rod 592, positioning groove 593, guide rod 594, first sprocket 595, second sprocket 596, chain 597, limit block 598, limit groove 599, tool 60. DETAILED DESCRIPTION

[0072] To make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0073] The present invention provides a fast tool change structure suitable for CNC machine tools. Figure 1-Figure 6 , comprising a base 10, a knife seat 20 is provided just above the base 10, and a plurality of knives 60 are provided on the knife seat 20;

[0074] It also includes: a bearing assembly for supporting the knife seat 20, and the bearing assembly is arranged between the base 10 and the knife seat 20;

[0075] The bearing assembly includes: a hollow tube 30, an annular groove 31, an annular plate 32, a first box body 33, a first cylinder 34, a first extrusion plate 35, and a first rotating shaft 36;

[0076] The hollow tube 30 is fixedly mounted on the top of the base 10, the annular groove 31 is opened on the top of the hollow tube 30, the annular plate 32 is fixedly mounted on the bottom of the knife seat 20, and the annular plate 32 is slidably connected to the top of the annular groove 31, the first rotating shaft 36 is fixedly mounted on the bottom middle end of the knife seat 20, the first box body 33 is fixedly mounted on the bottom of the annular plate 32, the first cylinder 34 is fixedly mounted in the first box body 33, the first cylinder 34 is fixedly mounted on the first extrusion plate 35 through the piston rod, and the first extrusion plate 35 is in close contact with the bottom end of the annular groove 31; wherein, the opposite ends of the first extrusion plate 35 and the annular groove 31 are arranged as end face teeth.

[0077] It also includes: a fixing assembly for fixing the tool 60, and the fixing assembly is arranged on the tool holder 20;

[0078] The fixing assembly includes: a fourth rotating shaft 50, a pressure plate 51, a first square groove 52, a first square rod 53, a first stud 54, a threaded groove 55, a fifth rotating shaft 56, a second square groove 57, a second square rod 58, a second stud 59, a lifting plate 591, a positioning rod 592, a positioning groove 593, a guide rod 594, a first sprocket 595, a second sprocket 596, a chain 597, a limit block 598, and a limit groove 599;

[0079] The fourth rotating shaft 50 is rotatably connected to the bottom end of the tool holder 20 through a bearing, the pressure plate 51 is fixedly installed on the bottom of the fourth rotating shaft 50, the first square groove 52 is opened in the fourth rotating shaft 50, the first square rod 53 is slidably connected in the first square groove 52, the first stud 54 is fixedly installed on the top of the first square rod 53, and the first stud 54 is threadedly connected to the top of the tool holder 20, the thread groove 55 is opened on the bottom end of the tool 60, and the top end of the first stud 54 is threadedly connected in the thread groove 55, the fifth rotating shaft 56 is rotatably connected to the bottom end of the tool holder 20 through a bearing, the second square groove 57 is opened in the fifth rotating shaft 56, the second square rod 58 is slidably connected in the second square groove 57, the second stud 59 is fixedly installed on the top of the second square rod 58, and the second stud 59 is threadedly connected in On the top of the tool holder 20, the top of the second stud 59 is rotatably connected to the lifting plate 591, the positioning rod 592 is fixedly installed on one side of the bottom of the lifting plate 591, the positioning groove 593 is opened on the top of the tool holder 20, and the bottom end of the positioning rod 592 passes through the tool 60 and is inserted in the positioning groove 593, the guide rod 594 is fixedly installed on the other side of the bottom of the lifting plate 591, and the guide rod 594 is slidably connected to the top of the tool holder 20, the first sprocket 595 is fixedly installed on the fifth rotating shaft 56, the second sprocket 596 is fixedly installed on the fourth rotating shaft 50, the first sprocket 595 and the second sprocket 596 are connected by a chain 597, the limit block 598 is fixedly installed on the top of the tool holder 20, the limit groove 599 is opened on the bottom end of the tool 60, and the limit block 598 is inserted in the limit groove 599.

[0080] It also includes: a driving assembly for making the bearing assembly and the fixing assembly operate independently, and the driving assembly is arranged on the base 10;

[0081] The driving assembly includes: a box body 40, a servo motor 41, a second rotating shaft 42, a first pulley 43, a third rotating shaft 44, a second pulley 45, a belt 46, a second box body 47, a second cylinder 48, a second extrusion plate 49, a third box body 491, a third cylinder 492, and a third extrusion plate 493;

[0082] The box body 40 is fixedly mounted on the top of the base 10, the servo motor 41 is fixedly mounted in the box body 40, the second rotating shaft 42 is fixedly mounted on the output shaft of the servo motor 41, the first pulley 43 is fixedly mounted on the second rotating shaft 42, the third rotating shaft 44 is rotatably connected to the middle part of the base 10 through a bearing, the second pulley 45 is fixedly mounted on the third rotating shaft 44, the first pulley 43 and the second pulley 45 are connected through a belt 46, the second box body 47 is fixedly mounted on the top of the second rotating shaft 42, and the second cylinder 48 is fixedly mounted in the second box body 47. The second cylinder 48 fixes the second extrusion plate 49 through a piston rod, and a pressure plate 51 is provided directly above the second extrusion plate 49, the third box body 491 is fixedly installed on the top of the third rotating shaft 44, the third cylinder 492 is fixedly installed in the third box body 491, the third cylinder 492 fixes the third extrusion plate 493 through a piston rod, and a first rotating shaft 36 is provided directly above the third extrusion plate 493; wherein, the opposite ends of the second extrusion plate 49 and the pressure plate 51 are configured as end face teeth, and the opposite ends of the third extrusion plate 493 and the first rotating shaft 36 are also configured as end face teeth.

[0083] An operating method for a quick tool change structure suitable for a CNC machine tool comprises the following specific steps:

[0084] Step 1: The second rotating shaft 42 and the third rotating shaft 44 are rotated by the servo motor 41;

[0085] Step 2: If the angle of the tool holder 20 needs to be adjusted, the third extrusion plate 493 is moved toward the first rotating shaft 36 by the third cylinder 492 until the third extrusion plate 493 extrudes the first rotating shaft 36. At this time, the first rotating shaft 36 drives the tool holder 20 to rotate until the tool holder 20 is at a suitable horizontal angle. Then, the first extrusion plate 35 is extruded on the annular groove 31 by the first cylinder 34, so that the horizontal angle of the tool holder 20 can be fixed.

[0086] Step three: When installing the tool 60, insert the limit block 598 into the limit groove 599 to position the tool 60. Then, use the second cylinder 48 to make the second extrusion plate 49 squeeze the pressure plate 51. At this time, the fourth shaft 50 will drive the first stud 54 to rotate so that the top end of the first stud 54 is threadedly connected to the thread groove 55. At the same time, when the fourth shaft 50 rotates, the second stud 59 will also be driven to rotate through the fifth shaft 56. When the second stud 59 rotates, it will drive the lifting plate 591 to descend until the positioning rod 592 passes through the tool 60 and is inserted into the positioning groove 593. At this point, the tool 60 can be installed.

[0087] Although the present invention has been described above with reference to the embodiments, various modifications may be made thereto and parts thereof may be replaced by equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the various features in the embodiments disclosed in the present invention may be used in combination with each other in any manner, and the fact that these combinations are not exhaustively described in this specification is only for the sake of omitting space and saving resources. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A quick tool change structure suitable for a CNC machine tool, comprising a base (10), a tool holder (20) being arranged directly above the base (10), and a plurality of tools (60) being arranged on the tool holder (20), characterized in that: Also includes: A bearing assembly for supporting the knife seat (20), wherein the bearing assembly is arranged between the base (10) and the knife seat (20); A fixing component for fixing the tool (60), wherein the fixing component is arranged on the tool holder (20); A driving component is used to enable the bearing component and the fixing component to operate independently, and the driving component is arranged on a base (10).

2. A quick tool change structure suitable for CNC machine tools according to claim 1, characterized in that: The bearing assembly comprises: A hollow tube (30), wherein the hollow tube (30) is fixedly mounted on the top of the base (10); an annular groove (31), wherein the annular groove (31) is formed on the top end of the hollow tube (30); An annular plate (32), the annular plate (32) is fixedly mounted on the bottom of the knife seat (20), and the annular plate (32) is slidably connected to the top of the annular groove (31); A first rotating shaft (36), wherein the first rotating shaft (36) is fixedly mounted on the bottom middle end of the knife seat (20).

3. The rapid tool change structure suitable for CNC machine tools according to claim 2, characterized in that: The bearing assembly further comprises: A first box body (33), wherein the first box body (33) is fixedly mounted on the bottom of the annular plate (32); A first cylinder (34), the first cylinder (34) being fixedly installed in the first box body (33); A first extrusion plate (35), the first cylinder (34) is fixedly mounted with the first extrusion plate (35) via a piston rod, and the first extrusion plate (35) is in close contact with the bottom end of the annular groove (31).

4. The rapid tool change structure for a CNC machine tool according to claim 1, characterized in that: The fixing assembly comprises: A fourth rotating shaft (50), the fourth rotating shaft (50) being rotatably connected to the bottom end of the knife seat (20) via a bearing; A pressure plate (51), wherein the pressure plate (51) is fixedly mounted on the bottom of the fourth rotating shaft (50); A first square groove (52), wherein the first square groove (52) is formed in the fourth rotating shaft (50); A first square rod (53), wherein the first square rod (53) is slidably connected in the first square groove (52); A first stud (54), wherein the first stud (54) is fixedly mounted on the top of the first square rod (53), and the first stud (54) is threadedly connected to the top of the knife seat (20); A thread groove (55) is provided on the bottom end of the cutter (60), and the top end of the first stud (54) is threadedly connected in the thread groove (55).

5. The rapid tool change structure suitable for CNC machine tools according to claim 4, characterized in that: The fixing assembly further comprises: A fifth rotating shaft (56), the fifth rotating shaft (56) being rotatably connected to the bottom end of the knife seat (20) via a bearing; A second square groove (57), wherein the second square groove (57) is formed in the fifth rotating shaft (56); a second square rod (58), the second square rod (58) being slidably connected in the second square slot (57); A second stud (59), the second stud (59) is fixedly mounted on the top of the second square rod (58), and the second stud (59) is threadedly connected to the top of the knife seat (20); A lifting plate (591), the top of the second stud (59) is rotatably connected to the lifting plate (591); A positioning rod (592), wherein the positioning rod (592) is fixedly mounted on one side of the bottom of the lifting plate (591); A positioning groove (593), wherein the positioning groove (593) is formed on the top of the knife seat (20), and the bottom end of the positioning rod (592) passes through the knife (60) and is inserted into the positioning groove (593); A guide rod (594) is fixedly mounted on the other side of the bottom of the lifting plate (591), and the guide rod (594) is slidably connected to the top end of the knife seat (20).

6. The rapid tool change structure for CNC machine tools according to claim 5, characterized in that: The fixing assembly further comprises: A first sprocket (595), wherein the first sprocket (595) is fixedly mounted on the fifth rotating shaft (56); A second sprocket (596), wherein the second sprocket (596) is fixedly mounted on the fourth rotating shaft (50); Chain (597), the first sprocket (595) and the second sprocket (596) are connected by the chain (597).

7. The rapid tool change structure for a CNC machine tool according to claim 6, characterized in that: The fixing assembly further comprises: A limit block (598), wherein the limit block (598) is fixedly mounted on the top of the knife seat (20); A limiting groove (599) is provided on the bottom end of the tool (60), and a limiting block (598) is inserted into the limiting groove (599).

8. The rapid tool change structure for a CNC machine tool according to claim 1, characterized in that: The drive assembly comprises: A box body (40), wherein the box body (40) is fixedly mounted on the top of the base (10); A servo motor (41), wherein the servo motor (41) is fixedly installed in the box (40); A second rotating shaft (42), wherein the second rotating shaft (42) is fixedly mounted on an output shaft of the servo motor (41); A first belt pulley (43), wherein the first belt pulley (43) is fixedly mounted on the second rotating shaft (42); A third rotating shaft (44), the third rotating shaft (44) being rotatably connected to the middle portion of the base (10) via a bearing; A second pulley (45), wherein the second pulley (45) is fixedly mounted on the third rotating shaft (44); A belt (46), wherein the first pulley (43) and the second pulley (45) are connected by a belt (46).

9. The rapid tool change structure for a CNC machine tool according to claim 8, characterized in that: The drive assembly also includes: A second box body (47), wherein the second box body (47) is fixedly mounted on the top of the second rotating shaft (42); A second cylinder (48), the second cylinder (48) being fixedly mounted in the second box body (47); A second extrusion plate (49), the second cylinder (48) is fixedly mounted with the second extrusion plate (49) via a piston rod, and a pressure plate (51) is provided directly above the second extrusion plate (49); A third box body (491), wherein the third box body (491) is fixedly mounted on the top of the third rotating shaft (44); A third cylinder (492), wherein the third cylinder (492) is fixedly installed in the third box body (491); A third extrusion plate (493), the third cylinder (492) fixes the third extrusion plate (493) via a piston rod, and a first rotating shaft (36) is provided directly above the third extrusion plate (493).

10. An operating method for a rapid tool change structure of a CNC machine tool, characterized in that: The specific steps are as follows: Step 1: Using the servo motor (41) to rotate the second rotating shaft (42) and the third rotating shaft (44); Step 2: If the angle of the knife seat (20) needs to be adjusted, the third extrusion plate (493) is moved toward the first rotating shaft (36) by the third cylinder (492) until the third extrusion plate (493) extrudes the first rotating shaft (36). At this time, the first rotating shaft (36) drives the knife seat (20) to rotate until the knife seat (20) is at a suitable horizontal angle. Then, the first extrusion plate (35) is extruded on the annular groove (31) by the first cylinder (34), so that the horizontal angle of the knife seat (20) can be fixed; Step 3: When installing the tool (60), the limit block (598) is inserted into the limit groove (599) to locate the position of the tool (60). Then, the second extrusion plate (49) is pressed against the pressure plate (51) by the second cylinder (48). At this time, the fourth rotating shaft (50) drives the first stud (54) to rotate so that the top end of the first stud (54) is threadedly connected to the thread groove (55). At the same time, when the fourth rotating shaft (50) rotates, the second stud (59) is also driven to rotate through the fifth rotating shaft (56). When the second stud (59) rotates, it drives the lifting plate (591) to descend until the positioning rod (592) passes through the tool (60) and is inserted into the positioning groove (593). At this point, the tool (60) can be installed.

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