CN214868629U

CN214868629U - Double-spindle machine tool

Info

Publication number: CN214868629U
Application number: CN202121263914.9U
Authority: CN
Inventors: 吴金辉; 苏为旭
Original assignee: Zhejiang Jingdun Technology Co ltd
Current assignee: Zhejiang Jingdun Technology Co ltd
Priority date: 2021-06-07
Filing date: 2021-06-07
Publication date: 2021-11-26
Anticipated expiration: 2031-06-07

Abstract

The utility model provides a two main shaft lathe belongs to lathe technical field. The centering device solves the problems that the centering adjustment of the double main shafts of the existing machine tool is inconvenient and the like. This two main shaft lathe includes the lathe bed, be fixed with left headstock on the lathe bed and be connected with the right spindle seat that can the horizontal slip, right headstock has linked firmly right headstock on the right spindle seat, the locating plane has on the upper surface of right spindle seat, right headstock pastes and leans on the locating plane, convex preceding locating block has on the upper surface of right spindle seat front end, preceding constant head tank has been seted up on the right headstock, preceding locating block is embedded into preceding constant head tank and right headstock can follow preceding locating block and slide from beginning to end, convex regulating block has on the upper surface of preceding locating block, regulating hole and spacing hole have been seted up on the right headstock, wear to be equipped with adjusting bolt in the regulating hole, adjusting bolt's screw passes behind the regulating hole and regulating block threaded connection, spacing hole female connection has stop screw, stop screw's rear end supports and leans on the regulating block. The centering adjustment of the double main shafts in the machine tool is convenient.

Description

Double-spindle machine tool

Technical Field

The utility model belongs to the technical field of the lathe, a turn-milling composite machine tool is related to.

Background

A machine tool is an apparatus that machines a workpiece. Along with the complexity of workpiece machining, machining procedures such as milling and drilling can be greatly improved on the same machine tool. The lathe is a machine tool for turning a rotating workpiece by mainly using a lathe tool, and comprises a lathe body, a spindle box, a carriage assembly, a lathe tool rest and the like, wherein the spindle box and the carriage assembly are oppositely arranged on the lathe body, and the lathe tool rest is fixed on the carriage assembly. In order to enable a lathe to simultaneously realize machining processes such as turning, milling and drilling, a power tool apron is further installed on the carriage assembly, a turning tool is fixed on the turning tool apron and used for turning, and a milling cutter and a drilling tool are installed on the power tool apron to realize milling and drilling.

A main spindle box is arranged on the machine tool, one end of a workpiece is clamped by a clamp of the main spindle box, and the machine tool can only process the other end of the workpiece which is not clamped. When the two ends of the workpiece need to be machined, the workpiece is stopped and disassembled after one end of the workpiece is machined, and the workpiece is clamped again after turning around, so that the machining time of the workpiece can be prolonged, and the machining efficiency of the workpiece is reduced. In order to improve the machining effect, two main spindles are often arranged on a machine tool, one main spindle is fixed, and the other main spindle is movable, for example, a turning and milling combined machine tool (application number: CN 201921503175.9; the notice number is: 210451762U ], comprises a frame, a fixed main shaft device, a movable main shaft device and a power tool turret device. The fixed main shaft device is arranged on the frame, the movable main shaft device is opposite to the central axis of the fixed main shaft device, and the movable main shaft device is arranged on the frame through the main shaft moving device. The power tool turret device is arranged on the frame through the tool turret moving device and can move along a three-dimensional axis relative to the fixed main shaft device and the movable main shaft device. The power tool turret device comprises a tool turret and a driver, and the driver is connected with the tool turret and used for driving the tool turret to rotate. The cutter tower is provided with a plurality of cutter stations around the cutter tower, each cutter station is correspondingly provided with a turning cutter seat or a milling cutter seat, and the milling cutter seat is dynamically connected with a milling cutter driver. The fixed lathe tool on the lathe tool seat of the turret can be used for turning a workpiece, and the milling cutter or the drilling tool is arranged on the milling cutter seat of the turret and can be used for milling or drilling the workpiece.

During machining, a workpiece can be installed on the fixed spindle device for machining, after one end of the workpiece is machined, the movable spindle device moves to be close to the fixed spindle device, the workpiece is clamped by the movable spindle device and then loosened by the fixed spindle device, then the movable spindle device moves to a proper position, and then the other end of the workpiece is machined. In order to smoothly switch the workpiece to the movable main shaft device for clamping, the movable main shaft device and the fixed main shaft device need to be accurately aligned. In the above machine tool, the fixed spindle seat of the fixed spindle device is fixedly connected to the mounting seat of the machine frame, and the movable spindle seat of the movable spindle device is fixedly connected to the spindle slide seat. Because the processing error of the parts is unavoidable, the front and back positions between the fixed spindle seat and the movable spindle seat may have deviation, so that the central axes of the movable spindle device and the fixed spindle device cannot be aligned, and thus the movable spindle device and the fixed spindle device need to be aligned and adjusted, and no alignment adjusting structure is arranged between the fixed spindle seat and the mounting seat and between the movable spindle seat and the spindle sliding seat, so that the alignment adjustment of the movable spindle device and the fixed spindle device is inconvenient.

SUMMERY OF THE UTILITY MODEL

The utility model aims at the above-mentioned problem that prior art exists, provide a two main shaft lathe, the technical problem of solution makes two main shaft centering adjust convenient.

The purpose of the utility model can be realized by the following technical proposal:

a double-spindle machine tool comprises a machine tool body, wherein a left spindle box is fixed on the upper surface of the left end of the machine tool body, a connecting seat is fixed on the right side of the left spindle box on the upper surface of the machine tool body, a right spindle seat capable of sliding left and right is connected on the connecting seat, a right spindle box corresponding to the left spindle box is fixedly connected on the right spindle seat, a carriage assembly is mounted behind the connecting seat on the machine tool body, and a power tool turret is fixed on the carriage assembly, the double-spindle machine tool is characterized in that a positioning plane is arranged on the upper surface of the right spindle seat, the right spindle box is attached to the positioning plane and fixed through fixing bolts, strip-shaped fixing holes extending front and back are formed in four corners of the lower end of the right spindle box, the fixing bolts penetrate through the fixing holes and are in threaded connection with the right spindle seat, and a convex front positioning block is arranged on the upper surface of the front end of the right spindle seat, the left side surface and the right side surface of the front positioning block are planes and extend along the front-back direction, the lower surface of the right spindle box is provided with a front positioning groove, the front positioning block is embedded into the front positioning groove, the left side surface and the right side surface of the front positioning groove are respectively attached to the left side surface and the right side surface of the front positioning block, the right spindle box can slide back and forth along the front positioning block, a convex adjusting block is arranged on the upper surface of the rear end of the front positioning block, a regulating hole and a limiting hole are arranged on the front side surface of the right spindle box above the front positioning groove, an adjusting bolt penetrates through the adjusting hole, a screw rod of the adjusting bolt penetrates through the adjusting hole and then is in threaded connection with the adjusting block, the head of the adjusting bolt is abutted against the right spindle box, a limiting screw is connected to the inner thread of the limiting hole, and the rear end of the limiting screw is abutted against the front side face of the adjusting block.

The upper position and the lower position of the right spindle box are positioned through the positioning plane, the left side surface and the right side surface of the front positioning groove are respectively attached to the left side surface and the right side surface of the front positioning block to position the right spindle box left and right, and when the adjusting bolt is screwed down and the rear end of the limiting screw is abutted against the adjusting block, the front position and the rear position of the right spindle box are positioned. When the front and rear positions of the right spindle box need to be adjusted to center the double spindles, the adjusting bolt is rotated to enable the right spindle box to slide back and forth along the front positioning block, the limiting screw is screwed after the right spindle box moves in place, and then the fixing bolt is screwed. Therefore, the front and rear positions of the right spindle box can be adjusted through the adjusting bolt and the limiting screw in the double-spindle machine tool, so that the double spindles are convenient to adjust in centering.

In the double-spindle machine tool, the upper surface of the rear end of the right spindle base is provided with a protruding rear positioning block, the left side surface and the right side surface of the rear positioning block are planes and extend in the front-rear direction, the lower surface of the right spindle base is provided with a rear positioning groove, the rear positioning block is embedded into the rear positioning groove, and the left side surface and the right side surface of the rear positioning groove are respectively attached to the left side surface and the right side surface of the rear positioning block.

The left and right positions of the right spindle box are positioned through the front positioning block and the rear positioning block, and the front and rear positions of the right spindle box are adjusted to guide, so that the right spindle box is fixed on the right spindle seat stably and is convenient to adjust.

In the double-spindle machine tool, the right end of the right spindle seat is fixedly connected with an adjusting block, the upper end of the adjusting block protrudes out of the positioning plane, the upper end of the adjusting block is provided with a strip-shaped adjusting hole extending along the front-back direction, an adjusting bolt penetrates through the adjusting hole, a screw of the adjusting bolt is in threaded connection with the right spindle seat after penetrating through the adjusting hole, and the head of the adjusting bolt abuts against the adjusting block.

After the adjusting bolt is screwed down, the front and rear positions of the right spindle box can be further locked, the right spindle box is prevented from moving forwards and backwards, and the centering adjusting effect is guaranteed to be kept.

In the double-spindle machine tool, the right end face of the right spindle box is provided with an upper caulking groove, the right end face of the right spindle seat is provided with a lower caulking groove, the upper end of the adjusting block is embedded into the upper caulking groove, and the lower end of the adjusting block is embedded into the lower caulking groove. Therefore, the adjusting block can be hidden, and interference is avoided.

In foretell two main shaft lathe, right side headstock includes right box, be provided with rotatable right main shaft in the box of the right side, the left end of right main shaft stretches out right box and is connected with right anchor clamps, the right-hand member of right main shaft stretches out right box and is connected with right main motor, be connected with the brake disc on the right main shaft, be connected with the brake that corresponds with the brake disc on the box of the right side.

When the right main motor works, the right main shaft can be driven to rotate, so that a workpiece on the right clamp can rotate, and turning can be realized. When the peripheral surface of the workpiece needs to be milled or drilled, the right main motor stops working after the workpiece rotates to a proper position, the brake disc is locked by the action of the brake, and the right main shaft is circumferentially positioned, so that the peripheral surface of the workpiece can be machined.

In the double-spindle machine tool, the left spindle box comprises a left box body, and a tool setting gauge is connected to the right end face of the left box body. Automatic tool setting can be realized after the tool setting gauge is arranged, and the machining efficiency of the machine tool is improved.

In foretell two main shaft lathe, still be fixed with the safety cover on the right-hand member face of left side box, tool setting appearance is including fixing the base on left box and rotating the rocking arm of connection on the base, the rocking arm is L shape, one of base is kept away from to the rocking arm serves and is fixed with the tool bit, the rocking arm can rotate to make in the tool bit enters into the safety cover.

When the tool is set, the rotating arm rotates to enable the tool setting head to leave the protective cover to perform tool setting. After the tool setting is finished, the rotating arm rotates to enable the tool setting head to enter the protective cover, the protective cover has a protective effect on the tool setting head, chips and cutting fluid are prevented from polluting the tool setting gauge, and the tool setting gauge can accurately set the tool.

Compared with the prior art, the utility model has the advantages of it is following:

the adjusting block, the adjusting bolt and the limiting screw are arranged, the front position and the rear position of the right spindle box can be adjusted after the adjusting bolt and the limiting screw are rotated, and the double spindles of the double-spindle machine tool are convenient to adjust in centering. The front positioning block and the front positioning groove are arranged, and meanwhile, the rear positioning block and the rear positioning groove are also arranged, so that the right spindle box is stably guided when sliding back and forth on the right spindle seat, and the centering adjustment is convenient. And an adjusting block is arranged to ensure that the right spindle box after centering adjustment is stably locked on the right spindle seat. And the brake disc and the brake are arranged to mill and drill the peripheral surface of the workpiece. Set up tool setting appearance and safety cover, improve the machining efficiency of lathe.

Drawings

FIG. 1 is a perspective view of the present dual spindle machine;

FIG. 2 is a perspective view of the double spindle machine with the right spindle box and the right spindle base fixed;

fig. 3 is a split perspective view of the right headstock and the right headstock in the double-spindle machine tool.

In the figure, 1, a lathe bed; 2. a left main spindle box; 2a, a left box body; 2b, a left clamp; 3. tool setting gauge; 3a, a base; 3b, a rotating arm; 3c, tool bit alignment; 4. a protective cover; 5. a connecting seat; 6. a right spindle base; 6a, a positioning plane; 6b, a front positioning block; 6c, a rear positioning block; 6d, adjusting blocks; 6e, lower caulking grooves; 7. a right main spindle box; 7a, a right box body; 7a1, fixation holes; 7a2, front positioning groove; 7a3, rear positioning groove; 7a4, adjusting holes; 7a5, limiting hole; 7a6, upper caulking groove; 7b, a right clamp; 7c, a right main motor; 7d, a brake disc; 7e, a brake; 8. adjusting the bolt; 9. a limit screw; 10. an adjusting block; 10a, an adjusting hole; 11. installing a bolt; 12. adjusting the bolt; 13. a slide motor; 14. a carriage assembly; 15. a power tool turret.

Detailed Description

The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

Example one

As shown in fig. 1-3, a double-spindle machine tool comprises a machine body 1, wherein a left spindle box 2 is fixed on the upper surface of the left end of the machine body 1, and a left main motor is fixed on the left side surface of the machine body 1. The left headstock 2 comprises a left box body 2a, a rotatable left main shaft is arranged in the left box body 2a, the right end of the left main shaft extends out of the left box body 2a and is connected with a left clamp 2b, and the left end of the left main shaft extends out of the left box body 2a and is connected with a left main motor through a synchronous belt. The right end face of the left box body 2a is connected with a tool setting gauge 3, and the right end face of the left box body 2a is further fixed with a protective cover 4. The tool setting gauge 3 comprises a base 3a fixed on the left box body 2a and a rotating arm 3b rotatably connected to the base 3a, the rotating arm 3b is L-shaped, a tool setting head 3c is fixed on one end, far away from the base 3a, of the rotating arm 3b, and the rotating arm 3b can rotate to enable the tool setting head 3c to enter the protective cover 4.

The upper surface of the lathe bed 1 is provided with a connecting seat 5 fixedly connected to the right side of the left spindle box 2, the connecting seat 5 is provided with a right spindle seat 6 capable of sliding left and right, and the right spindle seat 6 is fixedly connected with a right spindle box 7 correspondingly arranged with the left spindle box 2. Fixedly connected with sliding motor 13 on the right-hand member of connecting seat 5, be connected with the screw-nut subassembly between sliding motor 13 and the right spindle drum 6, sliding motor 13 during operation passes through the right spindle drum 6 of screw-nut subassembly drive and removes. The right headstock 7 comprises a right box body 7a, a rotatable right main shaft is arranged in the right box body 7a, the left end of the right main shaft extends out of the right box body 7a and is connected with a right clamp 7b, and the right end of the right main shaft extends out of the right box body 7a and is connected with a right main motor 7 c. The right main shaft is connected with a brake disc 7d, and the right box body 7a is connected with a brake 7e corresponding to the brake disc 7 d. A carriage assembly 14 is arranged on the upper surface of the lathe bed 1 and behind the connecting seat 5, and a power tool turret 15 is fixed on the carriage assembly 14.

The right spindle head 6 has a positioning flat surface 6a on the upper surface thereof, and the right spindle head 7 is fixed to the positioning flat surface 6a by fixing bolts, which are not shown in the drawing. The lower surface of the right box body 7a is attached to the positioning plane 6a, strip-shaped fixing holes 7a1 extending forwards and backwards are formed in four corners of the lower end of the right box body 7a, and four fixing bolts correspond to the fixing holes 7a1 one by one. The screw of the fixing bolt passes through the fixing hole 7a1 and then is in threaded connection with the right spindle seat 6, and the head of the fixing bolt abuts against the corner of the right box 7 a. A front positioning block 6b is protruded from the upper surface of the front end of the right spindle base 6, and the left side surface and the right side surface of the front positioning block 6b are flat and extend in the front-rear direction. The lower surface of the right box body 7a is provided with a front positioning groove 7a2, the front positioning block 6b is embedded into the front positioning groove 7a2, the right box body 7a can slide back and forth along the front positioning block 6b, and the left side surface and the right side surface of the front positioning groove 7a2 are respectively attached to the left side surface and the right side surface of the front positioning block 6 b. The upper surface of the rear end of the right spindle base 6 is provided with a convex rear positioning block 6c, the left side surface and the right side surface of the rear positioning block 6c are planes and extend in the front-rear direction, the lower surface of the right spindle box 7 is provided with a rear positioning groove 7a3, the rear positioning block 6c is embedded into the rear positioning groove 7a3, and the left side surface and the right side surface of the rear positioning groove 7a3 are respectively attached to the left side surface and the right side surface of the rear positioning block 6 c.

The upper surface of the rear end of the front positioning block 6b is provided with a convex adjusting block 6d, the front side surface of the lower end of the right box body 7a is positioned above the front positioning groove 7a2 and is provided with an adjusting hole 7a4 and a limiting hole 7a5, the adjusting hole 7a4 is a step hole, and the limiting hole 7a5 is a threaded hole. An adjusting bolt 8 penetrates through the adjusting hole 7a4, a screw of the adjusting bolt 8 penetrates through the adjusting hole 7a4 and then is in threaded connection with the adjusting block 6d, the head of the adjusting bolt 8 abuts against the step of the adjusting hole 7a4, a limiting screw 9 is in threaded connection with the limiting hole 7a5, and the rear end of the limiting screw 9 abuts against the front side face of the adjusting block 6 d. The right end of the right spindle seat 6 is fixedly connected with an adjusting block 10, and the upper end of the adjusting block 10 protrudes out of the positioning plane 6 a. A lower caulking groove 6e is formed in the right end face of the right spindle seat 6, and the lower end of the adjusting block 10 is embedded into the lower caulking groove 6 e; an upper caulking groove 7a6 is opened on the right end surface of the right box 7a, and the upper end of the adjusting block 10 is inserted into the upper caulking groove 7a 6. The left side face of the lower end of the adjusting block 10 abuts against the bottom face of the lower embedding groove 6e and is fixed through the mounting bolt 11, a screw of the mounting bolt 11 penetrates through the adjusting block 10 and then is in threaded connection with the right spindle seat 6, and the head of the mounting bolt 11 abuts against the adjusting block 10. The upper end of the adjusting block 10 is provided with a strip-shaped adjusting hole 10a extending along the front-back direction, an adjusting bolt 12 penetrates through the adjusting hole 10a, a screw of the adjusting bolt 12 penetrates through the adjusting hole 10a and then is in threaded connection with the right box body 7a, and the head of the adjusting bolt 12 abuts against the adjusting block 10.

The upper position and the lower position of the right spindle box 7 are located through the locating plane 6a, the left position and the right position of the right spindle box 7 are located through the matched front locating groove 7a2 and the front locating block 6b, the matched rear locating groove 7a3 and the rear locating block 6c, and when the adjusting bolt 8 is screwed down and the rear end of the limiting screw 9 abuts against the adjusting block 6d, the front position and the rear position of the right spindle box 7 are located. When the front and back positions of the right spindle box 7 need to be adjusted to enable the left spindle and the right spindle to be centered, firstly, the fixing bolt and the adjusting bolt 12 are loosened, if the right spindle box 7 needs to be moved backwards, the adjusting bolt 8 is rotated to enable the right spindle box 7 to slide backwards along the front positioning block 6b and the rear positioning block 6c, the limiting screw 9 is screwed after the right spindle box is moved in place, if the right spindle box 7 needs to be moved forwards, the limiting screw 9 is loosened, then the adjusting bolt 8 is rotated to enable the right spindle box 7 to slide forwards along the front positioning block 6b and the rear positioning block 6c, the limiting screw 9 is screwed after the right spindle box is moved in place, and finally, the fixing bolt and the adjusting bolt 12 are screwed. Therefore, the front and back positions of the right main spindle box 7 can be adjusted through the adjusting bolt 8 and the limiting screw 9 in the double-spindle machine tool, and the double spindles are convenient to adjust in centering.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Claims

1. The utility model provides a double-spindle machine tool, includes lathe bed (1), be fixed with left headstock (2) on the upper surface of lathe bed (1) left end, the right side that lies in left headstock (2) on the upper surface of lathe bed (1) is fixed with connecting seat (5), be connected with right headstock (6) that can the horizontal slip on connecting seat (5), fixedly connected with right headstock (7) that correspond the setting with left headstock (2) on right headstock (6), lie in the rear of connecting seat (5) on lathe bed (1) and install planker subassembly (14), be fixed with power sword tower (15) on planker subassembly (14), its characterized in that, have locating plane (6a) on the upper surface of right headstock (6), right headstock (7) paste and lean on locating plane (6a) and fixed through fixing bolt, all set up on four corners of right headstock (7) lower extreme along the bar that extends around being fixed orifices (7a1) (7a 897 a) ) The fixing bolt penetrates through a fixing hole (7a1) and then is in threaded connection with a right spindle seat (6), a convex front positioning block (6b) is arranged on the upper surface of the front end of the right spindle seat (6), the left side surface and the right side surface of the front positioning block (6b) are planes and extend in the front-back direction, a front positioning groove (7a2) is formed in the lower surface of the right spindle seat (7), the front positioning block (6b) is embedded into the front positioning groove (7a2), the left side surface and the right side surface of the front positioning groove (7a2) are respectively attached to the left side surface and the right side surface of the front positioning block (6b), the right spindle seat (7) can slide back and forth along the front positioning block (6b), a convex adjusting block (6d) is arranged on the upper surface of the rear end of the front positioning block (6b), an adjusting hole (7a4) and a5) are formed in the front side surface of the front positioning groove (7a2) of the right spindle seat (7), wear to be equipped with adjusting bolt (8) in adjusting hole (7a4), the screw rod of adjusting bolt (8) pass adjusting hole (7a4) back and regulating block (6d) threaded connection, the head of adjusting bolt (8) supports and leans on right headstock (7), spacing hole (7a5) female connection has stop screw (9), the rear end of stop screw (9) supports and leans on the leading flank of regulating block (6 d).

2. The double spindle machine tool according to claim 1, wherein a rear positioning block (6c) is protruded from an upper surface of a rear end of the right spindle stock (6), a left side surface and a right side surface of the rear positioning block (6c) are flat and extend in a front-rear direction, a rear positioning groove (7a3) is opened on a lower surface of the right spindle stock (7), the rear positioning block (6c) is embedded into the rear positioning groove (7a3), and a left side surface and a right side surface of the rear positioning groove (7a3) are respectively attached to the left side surface and the right side surface of the rear positioning block (6 c).

3. The double-spindle machine tool according to claim 1, wherein an adjusting block (10) is fixedly connected to the right end of the right spindle seat (6), the upper end of the adjusting block (10) protrudes out of the positioning plane (6a), a strip-shaped adjusting hole (10a) extending in the front-back direction is formed in the upper end of the adjusting block (10), an adjusting bolt (12) penetrates through the adjusting hole (10a), a screw of the adjusting bolt (12) penetrates through the adjusting hole (10a) and then is in threaded connection with the right spindle box (7), and the head of the adjusting bolt (12) abuts against the adjusting block (10).

4. The double-spindle machine tool according to claim 3, wherein an upper caulking groove (7a6) is formed on the right end surface of the right spindle box (7), a lower caulking groove (6e) is formed on the right end surface of the right spindle base (6), the upper end of the adjusting block (10) is embedded in the upper caulking groove (7a6), and the lower end of the adjusting block (10) is embedded in the lower caulking groove (6 e).

5. The double-spindle machine tool according to any one of claims 1 to 4, wherein the right spindle box (7) comprises a right box body (7a), a rotatable right spindle is arranged in the right box body (7a), the left end of the right spindle extends out of the right box body (7a) and is connected with a right clamp (7b), the right end of the right spindle extends out of the right box body (7a) and is connected with a right main motor (7c), a brake disc (7d) is connected onto the right spindle, and a brake (7e) corresponding to the brake disc (7d) is connected onto the right box body (7 a).

6. A double-spindle machine tool according to any one of claims 1 to 4, wherein the left headstock (2) comprises a left box (2a), and a tool setting gauge (3) is connected to the right end face of the left box (2 a).

7. The double-spindle machine tool according to claim 6, wherein a protective cover (4) is further fixed on the right end face of the left box body (2a), the tool setting gauge (3) comprises a base (3a) fixed on the left box body (2a) and a rotating arm (3b) rotatably connected to the base (3a), the rotating arm (3b) is L-shaped, a tool setting head (3c) is fixed on one end, far away from the base (3a), of the rotating arm (3b), and the rotating arm (3b) can rotate to enable the tool setting head (3c) to enter the protective cover (4).