CN210817808U

CN210817808U - Positioning device applied to threading machine

Info

Publication number: CN210817808U
Application number: CN201921603940.4U
Authority: CN
Inventors: 杨慧; 潘建留; 韩骑兵
Original assignee: Jiangsu Zhongyu Power Equipment Co ltd
Current assignee: Jiangsu Zhongyu Power Equipment Co ltd
Priority date: 2019-09-25
Filing date: 2019-09-25
Publication date: 2020-06-23
Anticipated expiration: 2029-09-25

Abstract

The utility model discloses a be applied to positioner of mantle fiber machine, the on-line screen storage device comprises a base, the control box of setting on the base, the die head that rotates on the control box lateral wall, slide on the base and the three-jaw chuck relative with the die head, still including sliding the slide that is used for supporting the three-jaw chuck at the base and setting up on the slide and being located the three-jaw chuck and keeping away from the positioning seat of die head one side, the roof of slide is equipped with the installation component that is used for fixing the positioning seat, the roof of positioning seat is equipped with the V type groove that is used for placing the pipe fitting, the roof of positioning seat is equipped with the pressure tight subassembly of fixing the pipe fitting in V type groove, the roof of base is equipped with the automatic regulating assembly that drives; the positioning device can accurately position the workpiece, can stably fix the pipe fitting, replaces manpower to adjust the length of the thread to be machined of the pipe fitting, improves the thread machining precision, and is high in production efficiency.

Description

Positioning device applied to threading machine

Technical Field

The utility model relates to a technical field of mantle fiber machine, in particular to be applied to positioner of mantle fiber machine.

Background

The threading machine is also called an electric threading machine, an electric pipe cutting threading machine, a pipe thread threading machine and a steel bar threading machine, can carry out threading on pipe materials, bar materials and steel bars, and particularly electrically drives a pipe thread stranding plate, so that the processing of pipe threads during pipeline installation becomes easy and quick, the labor intensity of pipeline installation workers is reduced, and the threading machine is suitable for the requirements of batch production of related enterprises such as steel pipe factories, electric power, bridges and the like.

The prior Chinese patent with the publication number of CN206912409U discloses a threading machine, which comprises a machine body and a first chuck, wherein a first chuck cover for covering the first chuck is connected on the machine body in a sliding way; when the first chuck rotates, the arrangement of the first chuck cover can reduce the possibility that hands, clothes or other objects of an operator are stuck in by the chuck, and the protection effect is achieved.

However, the above technical solutions have the following disadvantages: during this mantle fiber machine mantle fiber, to the work piece centre gripping, but need the screw length that the manual adjustment work piece of operating personnel needs processed, could carry out the mantle fiber processing, because the screw length who processes all relies on workman's naked eye to judge, the less or great condition of screw length appears often, it is not high to have the adjustment precision, when batch production, the mantle fiber length position uniformity of the work piece after the processing is relatively poor, lead to the work piece to need to reprocess or scrap the processing, simultaneously because when the mantle fiber to the work piece, the work piece produces the vibration easily, through first chuck centre gripping, low stability, and then reduced production efficiency.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a be applied to positioner of mantle fiber machine, its advantage: this positioner can be stable fixed to the pipe fitting, replaces the required screw thread length of processing of manpower adjustment pipe fitting, has improved the screw thread machining precision, and production efficiency is high.

The above technical purpose of the present invention can be achieved by the following technical solutions:

the utility model provides a be applied to positioner of mantle fiber machine, includes the base, sets up control box on the base, rotates die head on the control box lateral wall, slides on the base and with the relative three-jaw chuck of die head, still including sliding the slide that is used for supporting three-jaw chuck at the base and set up on the slide and be located the three-jaw chuck and keep away from the positioning seat of die head one side, the roof of slide is equipped with the installation component who is used for fixed positioning seat, the roof of positioning seat is equipped with the V type groove that is used for placing the pipe fitting, the roof of positioning seat is equipped with fixes the pipe fitting at the subassembly that compresses tightly of V type inslot, the roof of base is equipped with the automatic regulating assembly that the drive slide slided along its axial.

According to the technical scheme, firstly, the sliding seat is moved to a proper position by using the automatic adjusting assembly, and the distance between the three-jaw chuck and the die head is the length of the thread to be threaded; secondly, fixing the positioning seat on a proper position on the sliding seat by using the mounting assembly, so that the distance between one side wall of the positioning seat, which is deviated from the three-jaw chuck, and the side wall of the three-jaw chuck, which faces the die head, is the length size of the threading, which is not needed by the pipe fitting; then, one end of the pipe fitting penetrates through the three-jaw chuck and extends to the die head, the three-jaw chuck clamps the pipe fitting, and the other end of the pipe fitting extends into the V-shaped groove; finally, the pipe fitting is tightly pressed in the V-shaped groove by using the pressing assembly, so that the stability of the pipe fitting threading process is improved; adopt the positioner that above-mentioned structure constitutes, can stably fix the pipe fitting, replace the required screw thread length of processing of manpower adjustment pipe fitting, improved the machining precision, production efficiency is high.

The utility model discloses further set up to: the utility model discloses a slide, including the slide in the cavity wall and along a plurality of racks that the slide axial was arranged, two relative rotations in the cavity wall and with rack toothing's rolling disc, the installation piece of setting at the rolling disc roof, two relative settings at the screw rod of positioning seat diapire and set up the handle on the rack end wall, the roof of installation piece is equipped with the screw hole with screw rod screw-thread fit, the roof of slide is equipped with a plurality of through-holes that supply the screw rod to insert in the cavity along its axial equipartition, the axial of rack is reverse with the axial of slide, the handle is kept away from outside the one end of rack extends the lateral wall of slide, the outer wall of slide is equipped with the locking Assembly who is used for fixed handle.

According to the technical scheme, firstly, the screw rod is inserted into the cavity; meanwhile, the handle is pulled to drive the rack to slide in the cavity, the rack is meshed with the two rotating discs, so that the rotating discs rotate to drive the mounting block to rotate, and the screw can be rotated into the threaded hole along with the downward movement of the screw, so that the fixing of the positioning seat is finally realized; then, the handle is fixed by the locking assembly, so that the connection stability between the screw and the mounting block is improved.

The utility model discloses further set up to: the locking assembly comprises a connecting plate and a positioning pin, the connecting plate is arranged on the handle, a mounting hole for the positioning pin to pass through is formed in the side wall of the connecting plate, a positioning hole corresponding to the mounting hole is formed in the outer wall of the sliding seat, and the positioning pin is sequentially inserted into the mounting hole and the positioning hole from outside to inside.

Through above-mentioned technical scheme, insert mounting hole, locating hole with the locating pin from top to bottom in proper order in, and then can fix the roof at the slide with the connecting plate to the realization is fixed the handle, has improved the stability fixed to the positioning seat.

The utility model discloses further set up to: the pressing assembly comprises a first lug, a second lug, an arc-shaped pressing plate, an inserting block and a magnet, wherein the first lug, the second lug, the arc-shaped pressing plate, the inserting block and the magnet are oppositely arranged on the side wall of the positioning seat facing the three-jaw chuck, the first lug and the second lug are positioned on two sides of the V-shaped groove, the arc-shaped pressing plate is hinged to the side wall of the first lug, the inserting block and the magnet are arranged on the arc-shaped pressing plate, one end of the inserting block is hinged to the top wall of the second lug.

Through above-mentioned technical scheme, after the pipe fitting extends to V type inslot, rotate the arc clamp plate for the inserted block inserts in the slot, and then two magnet inhale with, thereby can compress tightly the pipe fitting in V type inslot, avoid its vibrations, improved the stability to pipe fitting course of working.

The utility model discloses further set up to: the automatic adjusting assembly comprises a driving strip, a toothed disc, a driving toothed disc rotating motor and a distance sensor, wherein the driving strip is arranged on the side wall of the sliding seat and in the same direction as the sliding seat in the axial direction, the toothed disc is arranged on the top wall of the driving strip, the toothed disc is meshed with the toothed disc, the driving toothed disc is rotated by the motor, the distance sensor is electrically connected with the motor, and the distance sensor is arranged on the side wall of the three-jaw chuck towards the.

According to the technical scheme, the initial numerical value of the length of the thread to be machined of the pipe fitting is input into a PLC control program; secondly, the motor is driven, the fluted disc rotates, and the saw teeth are meshed with the fluted disc, so that the sliding seat is driven to slide along the axial direction of the base; meanwhile, a distance sensor is used for detecting the distance value between the three-jaw chuck and the die head in real time, when the distance value reaches a set initial value, the motor receives a signal and stops working, and then the sliding seat stops sliding, the distance between the three-jaw chuck and the die head is the length value of the thread to be processed of the pipe fitting, the three-jaw chuck can clamp the pipe fitting, one end of the pipe fitting extends to the die head, and the other end of the pipe fitting extends into the V-shaped groove; this drive mode has realized automated work, can be to accurate location of pipe fitting, and labour saving and time saving has improved the production efficiency and the precision of processing screw thread.

The utility model discloses further set up to: the roof of base is equipped with the guide way along its axial, the diapire of slide all is equipped with the guide block that slides in the guide way.

Through above-mentioned technical scheme, the cooperation of guide block and guide way plays spacing and guide effect to sliding of slide, has improved the stability of slide process of sliding.

The utility model discloses further set up to: the end wall of the rack, which is far away from the handle, is provided with a limiting spring, one end of the limiting spring, which is far away from the rack, is fixed on the inner wall of the cavity, and the extending direction of the limiting spring is in the same direction as the axial direction of the rack.

Through the technical scheme, the handle is pulled outwards, the rack slides outwards along with the handle, the spring is stretched at the moment, and then the screw rod is inserted into the cavity; and meanwhile, the handle is released, and the elastic force of the limiting spring is utilized to drive the handle to slide in the direction away from the handle, so that the rotating disc rotates, and finally, the screw rod can be rotated into the threaded hole along with the downward movement of the screw rod, and finally, the fixing of the positioning seat is realized.

The utility model discloses further set up to: the length of the rack is larger than the sum of the diameters of the two rotating discs.

Through above-mentioned technical scheme, the diameter size sum of two rolling discs is less than the length size of rack for the rack can drive two rolling discs and rotate, makes the screw rod rotate to threaded hole, has realized fixing the positioning seat.

The utility model discloses following beneficial effect has:

1. firstly, moving a sliding seat to a proper position by using an automatic adjusting assembly, wherein the distance between a three-jaw chuck and a die head is the length of a thread to be threaded; secondly, fixing the positioning seat on a proper position on the sliding seat by utilizing a mounting assembly; then, the pipe fitting is tightly pressed in the V-shaped groove by using the pressing assembly, so that the stability of the pipe fitting threading process is improved; the positioning device formed by the structure can stably fix the pipe fitting, replaces manpower to adjust the length of the thread to be machined of the pipe fitting, improves the machining precision and has high production efficiency;

2. the driving motor drives the fluted disc to rotate so as to drive the sliding seat to slide along the axial direction of the base; meanwhile, a distance sensor is used for detecting the numerical value of the distance between the three-jaw chuck and the die head in real time, when the numerical value of the distance reaches a set initial value, a motor receives a signal and stops working, and then the sliding seat stops sliding, the distance between the three-jaw chuck and the die head is the numerical value of the length of the thread to be machined of the pipe fitting, and then the three-jaw chuck can clamp the pipe fitting;

3. the handle is pulled, the rack slides outwards along with the handle, the spring is stretched at the moment, and then the screw rod is inserted into the cavity; and meanwhile, the handle is released, and the elastic force of the limiting spring is utilized to drive the handle to slide in the direction away from the handle, so that the rotating disc rotates, and finally, the screw rod can be rotated into the threaded hole along with the downward movement of the screw rod, and finally, the fixing of the positioning seat is realized.

Drawings

Fig. 1 is a schematic view of the overall structure of the present embodiment.

Fig. 2 is an overall top sectional structure diagram of the present embodiment.

Fig. 3 is a schematic partial cross-sectional structural view for embodying an automatic adjusting assembly.

FIG. 4 is a schematic cross-sectional view of a compression assembly embodying same.

Fig. 5 is an enlarged schematic view of a portion a in fig. 2.

Fig. 6 is a schematic sectional structure view for embodying the inside of the cavity.

Reference numerals: 1. a base; 2. a control box; 3. a die head; 4. a three-jaw chuck; 5. a slide base; 6. positioning seats; 7. mounting the component; 71. a rack; 72. rotating the disc; 73. mounting blocks; 74. a screw; 75. a handle; 8. a V-shaped groove; 9. a compression assembly; 91. a first bump; 92. a second bump; 93. an arc-shaped pressing plate; 94. inserting a block; 95. a magnet; 10. an automatic adjustment assembly; 101. a drive bar; 102. saw teeth; 103. a fluted disc; 104. a motor; 105. a distance sensor; 11. a cavity; 12. a threaded hole; 13. a through hole; 14. a locking assembly; 141. a connecting plate; 142. positioning pins; 15. mounting holes; 16. positioning holes; 17. a slot; 18. a guide groove; 19. a guide block; 20. a limiting spring; 21. scale lines; 22. a pipe fitting.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Example (b):

a positioning device applied to a threading machine refers to fig. 1 and comprises a base 1, wherein the base 1 is arranged in a rectangular shape.

Referring to fig. 1, a control box 2 is installed at one end of the top wall of a base 1, a die head 3 is rotatably arranged on the side wall of the control box 2, a sliding seat 5 is slidably arranged on one side of the base 1, which is positioned on the control box 2, along the length direction of the control box, a three-jaw chuck 4 opposite to the die head 3 is fixed on the sliding seat 5, the central axis of the three-jaw chuck 4 and the central axis of the die head 3 are positioned on the same horizontal straight line, and scale marks 21 are arranged on the top wall of the base 1, which is positioned on the two sides of the sliding seat 5, along the length direction of the top wall, so that; when the threading machine is used, firstly, the sliding seat 5 slides to a proper position, then the three-jaw chuck 4 is used for clamping the pipe fitting 22, one end of the pipe fitting 22 extends to the die head 3, and at the moment, the distance between the die head 3 and the three-jaw chuck 4 is the length size of the thread to be machined.

Referring to fig. 1 and 2, a positioning seat 6 is mounted on the top wall of the sliding seat 5, which is located on the side of the top wall of the three-jaw chuck 4, which is far away from the die head 3, a mounting assembly 7 for fixing the positioning seat 6 is arranged on the top wall of the sliding seat 5, a V-shaped groove 8 which penetrates through the top wall of the positioning seat 6 is formed in the top wall of the positioning seat 6 in a downward extending manner, and the other end, which is far away from the three-jaw chuck 4; the arrangement of the V-shaped groove 8 is convenient for placing the pipe fittings 22 with different diameters, and the application range is wide; because the pipe fitting 22 can vibrate when being threaded, the side wall of the positioning seat 6 facing the three-jaw chuck 4 is provided with a pressing component 9 for fixing the pipe fitting 22 in the V-shaped groove 8, so that the stability of fixing the pipe fitting 22 is further enhanced, and the top wall of the base 1 is provided with an automatic adjusting component 10 for driving the sliding seat 5 to slide along the length direction of the sliding seat;

firstly, the sliding seat 5 is moved to a proper position by using the automatic adjusting component 10, and the distance between the three-jaw chuck 4 and the die head 3 is the length of the thread to be threaded; fixing the positioning seat 6 on the slide carriage 5 at a proper position by using a mounting assembly 7; then, one end of the pipe fitting 22 penetrates through the three-jaw chuck 4 and extends to the die head 3, the three-jaw chuck 4 clamps the pipe fitting 22, and the other end of the pipe fitting 22 extends into the V-shaped groove 8; finally, the pipe fitting 22 is tightly pressed in the V-shaped groove 8 by using the pressing assembly 9, so that the stability of the threading process of the pipe fitting 22 is improved; adopt the positioner that above-mentioned structure constitutes, can fix a position pipe fitting 22 steadily, and replace the screw thread length that the manpower adjustment pipe fitting 22 needs processed, improved the machining precision, production efficiency is high.

Referring to fig. 2 and 3, the automatic adjusting assembly 10 includes a driving bar 101 disposed on a side wall of the slide 5 and in the same direction as the axial direction thereof, a saw tooth 102 disposed on a top wall of the driving bar 101, a toothed disc 103 engaged with the saw tooth 102, a motor 104 driving the toothed disc 103 to rotate, and a distance sensor 105 disposed on a side wall of the three-jaw chuck 4 facing the die head 3, the distance sensor 105 being electrically connected to the motor 104;

firstly, inputting an initial numerical value of the thread length to be processed of the pipe fitting 22 into a PLC control program; secondly, the motor 104 is driven, the fluted disc 103 rotates, and the saw teeth 102 are meshed with the fluted disc 103, so that the sliding seat 5 is driven to slide along the axial direction of the base 1; meanwhile, a distance value between the three-jaw chuck 4 and the die head 3 is detected in real time by using a distance sensor 105, when the distance value reaches a set initial value, a signal is received by a motor 104, the work is stopped, and further the sliding seat 5 stops sliding, at the moment, the distance between the three-jaw chuck 4 and the die head 3 is a thread length value required to be processed by the pipe 22, further, the three-jaw chuck 4 can clamp the pipe 22, one end of the pipe 22 extends to face the die head 3, and the other end of the pipe 22 extends into the V-shaped groove 8; this drive mode has realized automated work, can be to the accurate location of pipe fitting 22, and labour saving and time saving has improved the production efficiency and the precision of processing screw thread.

Referring to fig. 3, the top wall of the base 1 is provided with a guide groove 18 along the axial direction thereof, the bottom wall of the sliding seat 5 is provided with a guide block 19 sliding in the guide groove 18, the guide block 19 and the guide groove 18 are matched to play a role in limiting and guiding the sliding of the sliding seat 5, and the stability of the sliding process of the sliding seat 5 is improved.

Referring to fig. 1 and 4, the pressing assembly 9 includes two first protrusions 91, second protrusions 92, an arc-shaped pressing plate 93 hinged to a side wall of the first protrusion 91, an insert block 94 disposed at an end of the arc-shaped pressing plate 93 far away from the hinge joint, and a magnet 95, which are oppositely disposed on a side wall of the positioning seat 6 facing the three-jaw chuck 4 and located at two sides of the V-shaped groove 8, the top wall of the second protrusion 92 is provided with a slot 17 for the insert block 94 to be inserted into, and the magnet 95 is disposed on a slot wall of the slot 17 and a side wall of the insert block 94 respectively; after pipe fitting 22 extends to in the V type groove 8, rotate arc clamp plate 93 for in the inserted block 94 inserts slot 17, and then two magnet 95 inhale, thereby can compress tightly pipe fitting 22 in V type groove 8, avoid its vibrations, improved the stability to pipe fitting 22 course of working.

Referring to fig. 5 and 6, a cavity 11 is provided in the slide carriage 5, the mounting assembly 7 includes a plurality of racks 71 sliding on the bottom wall of the cavity 11 and arranged along the axial direction of the slide carriage 5, two rotating discs 72 relatively rotating on the bottom wall of the cavity 11 and engaged with the racks 71, a mounting block 73 provided on the top wall of the rotating disc 72, two screws 74 relatively provided on the bottom wall of the positioning seat 6, and a handle 75 provided on the end wall of the racks 71, the top wall of the mounting block 73 is provided with threaded holes 12 in threaded fit with the screws 74, the top wall of the slide carriage 5 is uniformly provided with a plurality of through holes 13 along the axial direction thereof for inserting the screws 74 into the cavity 11, the axial direction of the racks 71 is opposite to the axial direction of the slide carriage 5, the length dimension of the racks, one end of the handle 75, which is far away from the rack 71, extends out of the side wall of the sliding seat 5, and the outer wall of the sliding seat 5 is provided with a locking assembly 14 for fixing the handle 75; first, the screw 74 is inserted into the cavity 11; meanwhile, the handle 75 is pulled to drive the rack 71 to slide in the cavity 11, and the rack 71 is meshed with the two rotating discs 72, so that the rotating discs 72 rotate to drive the mounting block to rotate, and the screw 74 can be rotated into the threaded hole 12 along with the downward movement of the screw 74, so that the fixing of the positioning seat 6 is finally realized; the handle 75 is then secured by the locking assembly 14, which improves the stability of the connection between the screw 74 and the mounting block 73.

Referring to fig. 6, the locking assembly 14 includes a connecting plate 141 disposed on the handle 75 and a positioning pin 142, a side wall of the connecting plate 141 is provided with a mounting hole 15 for the positioning pin 142 to pass through, and a top wall of the sliding seat 5 is provided with a positioning hole 16 corresponding to the mounting hole 15; the positioning pin 142 is inserted into the mounting hole 15 and the positioning hole 16 in sequence from outside to inside, so that the connecting plate 141 can be fixed on the top wall of the sliding seat 5, the handle 75 is fixed, and the stability of fixing the positioning seat 6 is improved.

Referring to fig. 6, a limiting spring 20 is arranged on an end wall of the rack 71, which is away from the handle 75, one end of the limiting spring 20, which is away from the rack 71, is fixed on the inner wall of the cavity 11, and the extending direction of the limiting spring 20 is the same as the axial direction of the rack 71; when the device is installed, the handle 75 is pulled outwards, the rack 71 slides outwards along with the handle 75, the spring is stretched at the moment, and then the screw 74 is inserted into the cavity 11; meanwhile, the handle 75 is released, the elastic force of the limiting spring 20 is utilized to drive the positioning plate to slide in the direction away from the handle 75, so that the rotating disc 72 rotates, and finally, the screw 74 can be rotated into the threaded hole 12 along with the downward movement of the screw 74, and finally, the positioning seat 6 is fixed.

The working process is as follows: firstly, pulling the handle 75, inserting the screw 74 into the cavity 11, moving down the screw 74, simultaneously releasing the handle 75, driving the rack 71 to slide into the cavity 11 by utilizing the elastic force of the limiting spring 20, and further rotating the rotating disc 72, so that the screw 74 can be rotated into the threaded hole 12, and the installation of the positioning seat 6 is realized; secondly, starting a motor 104, rotating a fluted disc 103 to drive a sliding seat 5 to slide, simultaneously detecting a distance value between the three-jaw chuck 4 and the die head 3 in real time by using a distance sensor 105, transmitting the detected value to a PLC (programmable logic controller) control circuit in real time, stopping the motor 104 when the distance value reaches a set initial value, and enabling the distance between the three-jaw chuck 4 and the die head 3 to be the length of a thread to be machined by the pipe fitting 22; finally, the pipe fitting 22 is clamped and fixed by the three-jaw chuck 4, the other end of the pipe fitting 22 extends into the V-shaped groove 8, the arc-shaped pressing plate 93 is rotated, the inserting block 94 is inserted into the inserting groove 17, the two magnet stones 95 are attracted, the pipe fitting 22 can be fixed in the V-shaped groove 8, the stability of fixing the pipe fitting 22 is improved, and the positioning and processing of the pipe fitting 22 are finally completed.

The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications to the present embodiment without inventive contribution as required after reading the present specification, but all of them are protected by patent laws within the scope of the claims of the present invention.

Claims

1. The utility model provides a be applied to positioner of mantle fiber machine, includes base (1), control box (2) of setting on base (1), rotates die head (3) on control box (2) lateral wall, slides on base (1) and three-jaw chuck (4) relative with die head (3), its characterized in that: still including sliding slide (5) that are used for supporting three-jaw chuck (4) in base (1) and setting up on slide (5) and be located three-jaw chuck (4) and keep away from positioning seat (6) of die head (3) one side, the roof of slide (5) is equipped with installation component (7) that are used for fixed positioning seat (6), the roof of positioning seat (6) is equipped with V type groove (8) that are used for placing pipe fitting (22), the roof of positioning seat (6) is equipped with fixes pipe fitting (22) compressing tightly subassembly (9) in V type groove (8), the roof of base (1) is equipped with drive slide (5) along its axial automatically regulated subassembly (10) that slide.

2. The positioning device applied to the threading machine according to claim 1, characterized in that: the device is characterized in that a cavity (11) is arranged in the sliding seat (5), the mounting assembly (7) comprises a plurality of racks (71) which slide on the inner bottom wall of the cavity (11) and are arranged along the axial direction of the sliding seat (5), two rotating discs (72) which relatively rotate on the inner bottom wall of the cavity (11) and are meshed with the racks (71), a mounting block (73) arranged on the top wall of the rotating discs (72), two screw rods (74) which are oppositely arranged on the bottom wall of the positioning seat (6) and a handle (75) arranged on the end wall of the racks (71), the top wall of the mounting block (73) is provided with a threaded hole (12) which is in threaded fit with the screw rods (74), a plurality of through holes (13) for inserting the screw rods (74) into the cavity (11) are uniformly distributed on the top wall of the sliding seat (5) along the axial direction, the axial direction of the racks (71) is opposite to the axial direction of the sliding seat (5), and, the outer wall of the sliding seat (5) is provided with a locking assembly (14) for fixing a handle (75).

3. The positioning device applied to the threading machine according to claim 2, characterized in that: the locking assembly (14) comprises a connecting plate (141) and a positioning pin (142) which are arranged on the handle (75), a mounting hole (15) for the positioning pin (142) to pass through is formed in the side wall of the connecting plate (141), a positioning hole (16) corresponding to the mounting hole (15) is formed in the outer wall of the sliding seat (5), and the positioning pin (142) is sequentially inserted into the mounting hole (15) and the positioning hole (16) from outside to inside.

4. The positioning device applied to the threading machine according to claim 3, characterized in that: compress tightly subassembly (9) including two relative settings in positioning seat (6) towards three-jaw chuck (4) lateral wall and be located first lug (91), second lug (92) of V type groove (8) both sides, articulate arc clamp plate (93) on first lug (91) lateral wall, set up and keep away from inserted block (94) and magnet (95) of articulated one end in arc clamp plate (93), the roof of second lug (92) is equipped with supplies inserted block (94) male slot (17), magnet (95) set up respectively on the cell wall of slot (17), the lateral wall of inserted block (94).

5. The positioning device applied to the threading machine according to claim 1, characterized in that: the automatic adjusting assembly (10) comprises a driving bar (101) which is arranged on the side wall of the sliding seat (5) and is in the same direction as the axial direction of the sliding seat, a saw tooth (102) which is arranged on the top wall of the driving bar (101), a fluted disc (103) which is meshed with the saw tooth (102), a motor (104) which drives the fluted disc (103) to rotate and a distance sensor (105) which is electrically connected with the motor (104), wherein the distance sensor (105) is arranged on the side wall of the three-jaw chuck (4) towards the die head (3).

6. The positioning device applied to the threading machine according to claim 5, characterized in that: the top wall of base (1) is equipped with guide way (18) along its axial, the diapire of slide (5) all is equipped with guide block (19) that slide in guide way (18).

7. The positioning device applied to the threading machine according to claim 2, characterized in that: the end wall of the rack (71) departing from the handle (75) is provided with a limiting spring (20), one end of the limiting spring (20) far away from the rack (71) is fixed on the inner wall of the cavity (11), and the extending direction of the limiting spring (20) is in the same direction as the axial direction of the rack (71).

8. The positioning device applied to the threading machine according to claim 2, characterized in that: the length dimension of the rack (71) is larger than the sum of the diameter dimensions of the two rotating discs (72).