阅读说明：本技术 一种可自动定孔的高性能车床 (High-performance lathe capable of automatically positioning holes ) 是由 李明 于 2021-06-03 设计创作，主要内容包括：本发明公开了一种可自动定孔的高性能车床,包括法兰,所述法兰的外侧设置有对其进行固定安装的安装设备,所述安装设备的内部设置根据法兰壁厚进行精准打孔的定位装置和为其提供动力的动力系统,所述安装设备的左侧设置凹槽,所述安装设备环绕在凹槽外侧,动力系统延伸到凹槽内,所述凹槽的内部设置凸台板。该可自动定孔的高性能车床,通过定位装置辅助,法兰被夹紧后,外控制件和内控制件也移动停止,且移动距离与内、外夹板的移动距离对应,外夹板移动多,外气压腔内气压大,定位装置下移,内夹板移动多,则相反,如此实现了自动定位,无论法兰的内径大小或壁厚怎么变化,保证打孔位置始终在内、外夹板的正中间。(The invention discloses a high-performance lathe capable of automatically positioning a hole, which comprises a flange, wherein installation equipment for fixedly installing the flange is arranged on the outer side of the flange, a positioning device for accurately punching the hole according to the wall thickness of the flange and a power system for providing power for the positioning device are arranged in the installation equipment, a groove is arranged on the left side of the installation equipment, the installation equipment surrounds the outer side of the groove, the power system extends into the groove, and a boss plate is arranged in the groove. This but high performance lathe of automatic fixed orifices, it is supplementary through positioner, the flange is pressed from both sides tightly the back, and outer control spare and interior control spare also remove and stop, and the displacement corresponds with the displacement of inside and outside splint, and the outside splint removes many, and the outer atmospheric pressure intracavity gas pressure is big, and positioner moves down, and the inside splint remove many, then on the contrary, so realized automatic positioning, no matter how big or the wall thickness of the internal diameter size of flange changes, guarantee to punch the position all the time including, the centre of outside splint.)

1. A high-performance lathe capable of automatically setting holes comprises a flange (4), and is characterized in that: the outer side of the flange (4) is provided with a mounting device (1) for fixedly mounting the flange, and a positioning device (2) for precisely punching the wall of the flange (4) and a power system (3) for providing power for the positioning device are arranged in the mounting device (1).

2. The self-drilling, high performance lathe of claim 1, wherein: the left side of the mounting device (1) is provided with a groove, the mounting device (1) surrounds the outer side of the groove, and the power system (3) extends into the groove.

3. The self-drilling high performance lathe of claim 2, wherein: the inside of recess sets up boss (11), outer oil pressure chamber (12) have been seted up in the inside of erection equipment (1) and the outside that is located the recess, interior oil pressure chamber (13) have been seted up to the inside of boss (11), be provided with outer splint (14) and interior splint (15) between outer oil pressure chamber (12), interior oil pressure chamber (13) and the recess respectively.

4. A self-drilling high performance lathe as defined in claim 3, wherein: the flange (4) is installed on boss (11), all pack in outer oil pressure chamber (12) and interior oil pressure chamber (13) and have hydraulic oil, outer oil pressure chamber (12) and interior oil pressure chamber (13) volume the same, outer splint (14) and interior splint (15) position quantity are relative, are located the outer wall and the inner wall of flange (4) respectively, set up the sealing washer between outer splint (14) and interior splint (15) and erection equipment (1).

5. The self-drilling high performance lathe of claim 4, wherein: the installation equipment is characterized in that an outer air pressure cavity (16) and an inner air pressure cavity (17) which correspond to the outer oil pressure cavity (12) and the inner oil pressure cavity (13) respectively are arranged in the installation equipment (1), an outer control part (18) is installed between the outer air pressure cavity (16) and the outer oil pressure cavity (12), and an inner control part (19) is installed between the inner air pressure cavity (17) and the inner oil pressure cavity (13).

6. The self-drilling high performance lathe of claim 5, wherein: the outer control part (18) and the inner control part (19) are both H-shaped, two ends of the outer control part (18) are respectively located in the outer oil pressure cavity (12) and the outer air pressure cavity (16), two ends of the inner control part (19) are respectively located in the inner oil pressure cavity (13) and the inner air pressure cavity (17), and the right sides of the outer control part (18) and the inner control part (19) are provided with external power.

7. The self-drilling high performance lathe of claim 5, wherein: the inner wall of the groove is provided with a mounting groove (21), connecting pore canals (22) are arranged among the mounting groove (21), the outer air pressure cavity (16) and the inner air pressure cavity (17), and fixing rods (23) are slidably mounted in the corresponding two connecting pore canals (22).

8. The self-drilling, high performance lathe of claim 7, wherein: the middle part of the fixing rod (23) is provided with a threaded hole, and the fixing rod (23) penetrates through the mounting groove (21).

9. The self-drilling, high performance lathe of claim 1, wherein: power system (3) include overcoat (31), the left end of overcoat (31) has been seted up and has been accomodate groove (32), the inside sliding connection who accomodates groove (32) has drill bit (33), movable groove (34) have been seted up to the right-hand member of overcoat (31), the internally mounted of movable groove (34) has activity spring (35), the right side fixedly connected with movable block (36) of activity spring (35), the right side meshing of movable block (36) has power wheel (37).

10. The self-centering high performance lathe as claimed in claim 9, wherein: drill bit (33) run through the screw hole, and the outside is provided with the displacement screw thread that corresponds with the screw hole, and the left side of drill bit (33) and the right side of movable block (36) are circular, and the right side of drill bit (33) and the left side of movable block (36) are square, and accomodate groove (32) and movable groove (34) and correspond rather than the shape.

Technical Field

The invention relates to the technical field of lathes, in particular to a high-performance lathe capable of automatically positioning a hole.

Background

The basis of the national prosperity is industry, the basis of the industrial prosperity is a lathe, the lathe is used for machining various industrial parts, the machining can be roughly divided into plasticity and drilling according to functions, the application field is very wide, and most of gears, large bolts and flanges are machined by the lathe.

The flange is a fixed sealing element and is in a ring shape, a circle of fixing holes are uniformly arranged around the flange, and due to the fact that the inner diameter and the wall thickness of the flange are different, when the fixing holes are drilled, position adjustment needs to be carried out according to conditions, and the flange is quite complex, so that the problem can be solved by providing a high-performance lathe capable of automatically positioning the holes.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention aims to provide a high-performance lathe capable of automatically positioning holes, which has the aim of accurately punching a flange.

The invention has the following beneficial effects:

1. this but high performance lathe of automatic fixed orifices, through setting up inside and outside splint, during the use, the fluid in outer oil pressure chamber and the interior oil pressure intracavity flows, promotes outside splint and interior splint and is close to the flange together, fixes the inner wall and the outer wall at the flange respectively, and the restriction flange removes, so has improved the fixed effect of flange, prevents that the powerful torsion of drill bit from making its skew.

2. This but high performance lathe of automatic fixed orifices connects inside and outside splint and positioner through outer control spare and interior control spare, during the use, will drive positioner through the displacement of inside and outside splint and remove, carries out assistance-localization real-time, has improved the accuracy.

3. This but high performance lathe of automatic fixed orifices, it is supplementary through positioner, the flange is pressed from both sides tightly the back, and outer control spare and interior control spare also remove and stop, and the displacement corresponds with the displacement of inside and outside splint, and the outside splint removes many, and the outer atmospheric pressure intracavity gas pressure is big, and positioner moves down, and the inside splint remove many, then on the contrary, so realized automatic positioning, no matter how big or the wall thickness of the internal diameter size of flange changes, guarantee to punch the position all the time including, the centre of outside splint.

4. This but high performance lathe of automatic fixed orifices through setting up driving system, drives the drill bit removal during positioner adjusts, and rethread overcoat drives the movable block and slides on the surface of power wheel, and the power wheel drives the movable block and rotates, and the movable block drives the overcoat automatic, and the overcoat drives the drill bit and rotates, and through drill bit outside screw thread and screw hole cooperation, the drill bit is close to the flange, drills at its surface, so when the drill bit moves about from top to bottom, can both keep the normal transmission of power.

The invention adopts the following technical scheme for realizing the technical purpose: the high-performance lathe capable of automatically positioning the hole comprises a flange, wherein mounting equipment for fixedly mounting the flange is arranged on the outer side of the flange, and a positioning device for precisely punching the hole according to the wall thickness of the flange and a power system for providing power for the positioning device are arranged in the mounting equipment.

Preferably, a groove is formed in the left side of the mounting device, the mounting device surrounds the outer side of the groove, and the power system extends into the groove.

As optimization, the inside of recess sets up the boss, the outside that the inside of erection equipment just is located the recess has seted up outer oil pressure chamber, interior oil pressure chamber has been seted up to the inside of boss, be provided with outer splint and inner splint between outer oil pressure chamber, interior oil pressure chamber and the recess respectively.

As optimization, the flange mounting is on the boss, outer oil pressure chamber and interior oil pressure intracavity all are filled with hydraulic oil, and outer oil pressure chamber is the same with interior oil pressure chamber volume, and it is corresponding with the ratio that receives pressure to guarantee the displacement distance of outer controlling part and interior controlling part, outer splint and interior splint position quantity are relative, are located the outer wall and the inner wall of flange respectively, set up the sealing washer between outer splint and interior splint and the erection equipment, prevent the oil leak.

As an optimization, an outer air pressure cavity and an inner air pressure cavity which correspond to the outer oil pressure cavity and the inner oil pressure cavity respectively are arranged in the mounting equipment, an outer control piece is arranged between the outer air pressure cavity and the outer oil pressure cavity, and an inner control piece is arranged between the inner air pressure cavity and the inner oil pressure cavity.

Preferably, the outer control piece and the inner control piece are both in an I shape, two ends of the outer control piece are respectively located in the outer oil pressure cavity and the outer air pressure cavity, two ends of the inner control piece are respectively located in the inner oil pressure cavity and the inner air pressure cavity, and external power is arranged on the right sides of the outer control piece and the inner control piece.

Preferably, the inner wall of the groove is provided with a mounting groove, connecting ducts are formed among the mounting groove, the outer air pressure cavity and the inner air pressure cavity, and fixing rods are slidably mounted in the corresponding two connecting ducts.

Preferably, the middle part of the fixing rod is provided with a threaded hole, and the fixing rod penetrates through the mounting groove.

As optimization, driving system includes the overcoat, the groove has been seted up to the left end of overcoat, the inside sliding connection who accomodates the groove has the drill bit, the movable groove has been seted up to the right-hand member of overcoat, the internally mounted in movable groove has a movable spring, and the movable block is hugged closely the power wheel all the time when the movable spring can, movable spring's right side fixedly connected with movable block, the right side meshing of movable block has the power wheel.

As optimization, set up the stopper between overcoat and the mounting groove, make the overcoat can reciprocate, can not remove about, the drill bit runs through the screw hole, and the outside is provided with the displacement screw thread that corresponds with the screw hole, and the left side of drill bit and the right side of movable block are circular, and the right side of drill bit and the left side of movable block are square, and accomodate groove and movable groove and correspond rather than the shape.

Drawings

In the figure: 1. installing equipment; 11. a boss; 12. an outer oil pressure chamber; 13. an inner oil pressure chamber; 14. an outer splint; 15. an inner splint; 16. an outer atmospheric pressure chamber; 17. an internal air pressure chamber; 18. an outer control; 19. an inner control member; 2. a positioning device; 21. mounting grooves; 22. a connecting channel; 23. fixing the rod; 3. a power system; 31. a jacket; 32. a receiving groove; 33. a drill bit; 34. a movable groove; 35. a movable spring; 36. a movable block; 37. a power wheel; 4. and (4) a flange.

FIG. 1 is a front view of a high performance lathe structure with automatic hole-setting capability according to the present invention.

FIG. 2 is an enlarged view of the high performance lathe structure 1 with self-drilling capability according to the present invention.

FIG. 3 is a side view of the high performance lathe structure of the present invention with self-centering.

FIG. 4 is a schematic diagram of a high performance lathe structural power system with automatic hole-positioning capability according to the present invention.

FIG. 5 is a schematic view of a high performance lathe flange with self-centering capability according to the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

Referring to fig. 1-2, a high-performance lathe capable of automatically positioning holes comprises a flange 4, a mounting device 1 for fixedly mounting the flange 4 is arranged on the outer side of the flange 4, a positioning device 2 for precisely drilling holes according to the wall thickness of the flange 4 and a power system 3 for providing power for the positioning device 1 are arranged in the mounting device 1.

The left side of the mounting device 1 is provided with a groove, the mounting device 1 surrounds the outer side of the groove, and the power system 3 extends into the groove.

The inside of recess sets up boss 11, and the outside that the inside of erection equipment 1 just is located the recess has seted up outer oil pressure chamber 12, and interior oil pressure chamber 13 has been seted up to the inside of boss 11, is provided with outer splint 14 and interior splint 15 between outer oil pressure chamber 12, interior oil pressure chamber 13 and the recess respectively.

Flange 4 installs on boss 11, all pack in outer oil pressure chamber 12 and the interior oil pressure chamber 13 has hydraulic oil, outer oil pressure chamber 12 is the same with interior oil pressure chamber 13 volume, it is corresponding with the ratio that receives pressure to guarantee outer control 18 and interior control 19's displacement distance, outer splint 14 is relative with interior splint 15 position quantity, be located flange 4's outer wall and inner wall respectively, set up the sealing washer between outer splint 14 and interior splint 15 and the erection equipment 1, prevent the oil leak.

During the use, the fluid in outer oil pressure chamber 12 and the interior oil pressure chamber 13 flows, promotes outer splint 14 and interior splint 15 and is close to flange 4 together, fixes respectively at the inner wall and the outer wall of flange 4, and the restriction flange removes, has so improved the fixed effect of flange, prevents that the powerful torsion of drill bit 33 from making its skew.

Example 2

Referring to fig. 1-3, a high-performance lathe capable of automatically positioning holes comprises a flange 4, a mounting device 1 for fixedly mounting the flange 4 is arranged on the outer side of the flange 4, a positioning device 2 for precisely drilling holes according to the wall thickness of the flange 4 and a power system 3 for providing power for the positioning device 1 are arranged in the mounting device 1.

The left side of the mounting device 1 is provided with a groove, the mounting device 1 surrounds the outer side of the groove, and the power system 3 extends into the groove.

The inside of recess sets up boss 11, and the outside that the inside of erection equipment 1 just is located the recess has seted up outer oil pressure chamber 12, and interior oil pressure chamber 13 has been seted up to the inside of boss 11, is provided with outer splint 14 and interior splint 15 between outer oil pressure chamber 12, interior oil pressure chamber 13 and the recess respectively.

Flange 4 installs on boss 11, outer oil pressure chamber 12 and interior oil pressure chamber 13 are all filled with hydraulic oil, outer oil pressure chamber 12 is the same with interior oil pressure chamber 13 volume, it is corresponding with the ratio that receives pressure to guarantee outer control 18 and interior control 19's displacement distance, outer splint 14 is relative with interior splint 15 position quantity, be located flange 4's outer wall and inner wall respectively, set up the sealing washer between outer splint 14 and interior splint 15 and the erection equipment 1, prevent oil leak

An outer air pressure cavity 16 and an inner air pressure cavity 17 which respectively correspond to the outer oil pressure cavity 12 and the inner oil pressure cavity 13 are arranged inside the mounting device 1, an outer control part 18 is arranged between the outer air pressure cavity 16 and the outer oil pressure cavity 12, and an inner control part 19 is arranged between the inner air pressure cavity 17 and the inner oil pressure cavity 13.

The outer control part 18 and the inner control part 19 are both in an I shape, two ends of the outer control part 18 are respectively positioned in the outer oil pressure cavity 12 and the outer air pressure cavity 16, two ends of the inner control part 19 are respectively positioned in the inner oil pressure cavity 13 and the inner air pressure cavity 17, external power is arranged on the right sides of the outer control part 18 and the inner control part 19, and the external power can be an electric telescopic rod or a motor.

When the device is used, the external power pushes the outer control part 18 and the inner control part 19 to move towards the left side, air in the outer air pressure cavity 16 and the inner air pressure cavity 17 is squeezed into the positioning device 2, and the inner clamping plate, the outer clamping plate and the positioning device 2 are connected through the outer control part 18 and the inner control part 19 to perform auxiliary positioning.

Example 3

Referring to fig. 1-3, a boss 11 is disposed inside the groove, an outer oil pressure cavity 12 is disposed inside the mounting apparatus 1 and outside the groove, an inner oil pressure cavity 13 is disposed inside the boss 11, and an outer clamping plate 14 and an inner clamping plate 15 are disposed between the outer oil pressure cavity 12, the inner oil pressure cavity 13 and the groove, respectively.

Flange 4 installs on boss 11, all pack in outer oil pressure chamber 12 and the interior oil pressure chamber 13 has hydraulic oil, outer oil pressure chamber 12 is the same with interior oil pressure chamber 13 volume, it is corresponding with the ratio that receives pressure to guarantee outer control 18 and interior control 19's displacement distance, outer splint 14 is relative with interior splint 15 position quantity, be located flange 4's outer wall and inner wall respectively, set up the sealing washer between outer splint 14 and interior splint 15 and the erection equipment 1, prevent the oil leak.

An outer air pressure cavity 16 and an inner air pressure cavity 17 which respectively correspond to the outer oil pressure cavity 12 and the inner oil pressure cavity 13 are arranged inside the mounting device 1, an outer control part 18 is arranged between the outer air pressure cavity 16 and the outer oil pressure cavity 12, and an inner control part 19 is arranged between the inner air pressure cavity 17 and the inner oil pressure cavity 13.

The outer control part 18 and the inner control part 19 are both in an I shape, two ends of the outer control part 18 are respectively positioned in the outer oil pressure cavity 12 and the outer air pressure cavity 16, two ends of the inner control part 19 are respectively positioned in the inner oil pressure cavity 13 and the inner air pressure cavity 17, and external power is arranged on the right sides of the outer control part 18 and the inner control part 19.

The inner wall of the groove is provided with an installation groove 21, a connecting pore passage 22 is arranged between the installation groove 21 and the outer air pressure cavity 16 and between the installation groove 21 and the inner air pressure cavity 17, and a fixing rod 23 is arranged in the two corresponding connecting pore passages 22 in a sliding mode.

The middle part of the fixing rod 23 is provided with a threaded hole, and the fixing rod 23 penetrates through the mounting groove 21.

When the automatic positioning device is used, the external power pushes the outer control part 18 and the inner control part 19 to move towards the left side, air in the outer air pressure cavity 16 and the inner air pressure cavity 17 is squeezed into the positioning device 2, meanwhile, the oil pushes the inner clamping plate and the outer clamping plate to be close to the flange 4, after the flange 4 is clamped, the outer control part 18 and the inner control part 19 also move and stop, the moving distance corresponds to that of the inner clamping plate and the outer clamping plate, the outer clamping plate 14 moves more, the air pressure in the outer air pressure cavity 16 is large, the positioning device 2 moves downwards, the inner clamping plate 15 moves more, and on the contrary, automatic positioning is realized, and the punching position is always in the middle of the inner clamping plate and the outer clamping plate no matter how the inner diameter or the wall thickness of the flange 4 changes.

Example 4

Referring to fig. 1-4, a high-performance lathe capable of automatically positioning holes comprises a flange 4, a mounting device 1 for fixedly mounting the flange 4 is arranged on the outer side of the flange 4, a positioning device 2 for precisely drilling holes according to the wall thickness of the flange 4 and a power system 3 for providing power for the positioning device 1 are arranged in the mounting device 1.

The inner wall of the groove is provided with an installation groove 21, a connecting pore passage 22 is arranged between the installation groove 21 and the outer air pressure cavity 16 and between the installation groove 21 and the inner air pressure cavity 17, and a fixing rod 23 is arranged in the two corresponding connecting pore passages 22 in a sliding mode.

The middle part of the fixing rod 23 is provided with a threaded hole, and the fixing rod 23 penetrates through the mounting groove 21.

The power system 3 comprises an outer sleeve 31, a containing groove 32 is formed in the left end of the outer sleeve 31, a drill bit 33 is connected to the inside of the containing groove 32 in a sliding mode, a movable groove 34 is formed in the right end of the outer sleeve 31, a movable spring 35 is arranged inside the movable groove 34, a movable block 36 is tightly attached to a power wheel 37 all the time when the movable spring 35 is used, the movable block 36 is fixedly connected to the right side of the movable spring 35, and the power wheel 37 is meshed to the right side of the movable block 36.

Set up the stopper between overcoat 31 and the mounting groove 21, make overcoat 31 can reciprocate, can not remove about, drill bit 33 runs through the screw hole, and the outside is provided with the displacement screw thread that corresponds with the screw hole, and the left side of drill bit 33 and the right side of movable block 36 are circular, and the right side of drill bit 33 and the left side of movable block 36 are square, and accomodate groove 32 and movable groove 34 and correspond rather than the shape.

When the positioning device 2 is adjusted, the drill bit 33 is driven to move, the outer sleeve 31 drives the movable block 36 to slide on the surface of the power wheel 37, the power wheel 37 drives the movable block 36 to rotate, the movable block 36 drives the outer sleeve 31 to rotate, the outer sleeve 31 drives the drill bit 33 to rotate, the drill bit 33 approaches the flange 4 through the matching of the outer side threads of the drill bit 33 and the threaded hole, holes are drilled on the surface of the drill bit, and therefore when the drill bit 33 moves up and down, normal transmission of power can be kept.

Example 5

The utility model provides a but high performance lathe of automatic fixed orifices, includes flange 4, and the outside of flange 4 is provided with erection equipment 1 that carries out fixed mounting to it, and erection equipment 1's inside sets up and carries out accurate positioner 2 that punches and the driving system 3 who provides power for it according to flange 4 wall thickness.

The left side of the mounting device 1 is provided with a groove, the mounting device 1 surrounds the outer side of the groove, and the power system 3 extends into the groove.

The inside of recess sets up boss 11, and the outside that the inside of erection equipment 1 just is located the recess has seted up outer oil pressure chamber 12, and interior oil pressure chamber 13 has been seted up to the inside of boss 11, is provided with outer splint 14 and interior splint 15 between outer oil pressure chamber 12, interior oil pressure chamber 13 and the recess respectively.

Flange 4 installs on boss 11, all pack in outer oil pressure chamber 12 and the interior oil pressure chamber 13 has hydraulic oil, outer oil pressure chamber 12 is the same with interior oil pressure chamber 13 volume, it is corresponding with the ratio that receives pressure to guarantee outer control 18 and interior control 19's displacement distance, outer splint 14 is relative with interior splint 15 position quantity, be located flange 4's outer wall and inner wall respectively, set up the sealing washer between outer splint 14 and interior splint 15 and the erection equipment 1, prevent the oil leak.

An outer air pressure cavity 16 and an inner air pressure cavity 17 which respectively correspond to the outer oil pressure cavity 12 and the inner oil pressure cavity 13 are arranged inside the mounting device 1, an outer control part 18 is arranged between the outer air pressure cavity 16 and the outer oil pressure cavity 12, and an inner control part 19 is arranged between the inner air pressure cavity 17 and the inner oil pressure cavity 13.

The outer control part 18 and the inner control part 19 are both in an I shape, two ends of the outer control part 18 are respectively positioned in the outer oil pressure cavity 12 and the outer air pressure cavity 16, two ends of the inner control part 19 are respectively positioned in the inner oil pressure cavity 13 and the inner air pressure cavity 17, and external power is arranged on the right sides of the outer control part 18 and the inner control part 19.

The inner wall of the groove is provided with an installation groove 21, a connecting pore passage 22 is arranged between the installation groove 21 and the outer air pressure cavity 16 and between the installation groove 21 and the inner air pressure cavity 17, and a fixing rod 23 is arranged in the two corresponding connecting pore passages 22 in a sliding mode.

The middle part of the fixing rod 23 is provided with a threaded hole, and the fixing rod 23 penetrates through the mounting groove 21.

The power system 3 comprises an outer sleeve 31, a containing groove 32 is formed in the left end of the outer sleeve 31, a drill bit 33 is connected to the inside of the containing groove 32 in a sliding mode, a movable groove 34 is formed in the right end of the outer sleeve 31, a movable spring 35 is arranged inside the movable groove 34, a movable block 36 is tightly attached to a power wheel 37 all the time when the movable spring 35 is used, the movable block 36 is fixedly connected to the right side of the movable spring 35, and the power wheel 37 is meshed to the right side of the movable block 36.

Set up the stopper between overcoat 31 and the mounting groove 21, make overcoat 31 can reciprocate, can not remove about, drill bit 33 runs through the screw hole, and the outside is provided with the displacement screw thread that corresponds with the screw hole, and the left side of drill bit 33 and the right side of movable block 36 are circular, and the right side of drill bit 33 and the left side of movable block 36 are square, and accomodate groove 32 and movable groove 34 and correspond rather than the shape.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.