CN214291230U

CN214291230U - Multifunctional thread cleaner

Info

Publication number: CN214291230U
Application number: CN202120087146.XU
Authority: CN
Inventors: 赵纯东; 黄正忠
Original assignee: Mianyang Brilliance Ruian Automotive Components Co ltd
Current assignee: Mianyang Brilliance Ruian Automotive Components Co ltd
Priority date: 2021-01-13
Filing date: 2021-01-13
Publication date: 2021-09-28
Anticipated expiration: 2031-01-13

Abstract

The utility model relates to a clear silk machine of multi-functional screw thread belongs to the clear silk equipment technical field of screw thread. The utility model discloses during the implementation, realize screw tap and screw thread contact through spring compressive force (flexible power), the difficult mashed tooth of screw thread. Furthermore, the utility model discloses a screw tap and rotating spindle's central through-hole structure can realize that the clear silk is blown to arrange and cuts and go on in step, can guarantee that threaded hole does not have the iron that remains and cuts. The combined screw tap consists of a spring, a spacer bush, a reamer bush and a screw tap; the through burrs of the threaded through hole and the VVT hole can be removed in the wire cleaning process, and the function of detecting the same cylindricity of the threaded through hole and the threaded through hole can be realized.

Description

Multifunctional thread cleaner

Technical Field

The utility model relates to a clear silk machine of multi-functional screw thread belongs to the clear silk equipment technical field of screw thread.

Background

Aiming at the automobile engine camshaft machining industry, most enterprises purchase standard threading machines (such as vertical threading machines) to be used as thread cleaning. The equipment is used for cleaning threads, which is easy to cause thread tooth decay, and particularly, fine threads are very easy to cause thread tooth decay in the thread cleaning process; meanwhile, standard tapping equipment does not have the function of cleaning the threads while purging the threads, more impurities such as iron scraps can be remained in the threaded holes after the threads are cleaned, and the use requirements can be met only by cleaning the threads again after the threads are cleaned.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a first technical problem that will solve is: provides a multifunctional thread cleaning machine which is not easy to cause thread tooth decay.

For solving the technical problem the utility model discloses the technical scheme who adopts is: the multifunctional thread cleaning machine comprises a driving motor, a rotating main shaft, a screw tap and a workpiece clamp, wherein the driving motor is fixedly arranged on an equipment rack, an output shaft of the driving motor is connected with the rotating main shaft through a transmission assembly, the screw tap is coaxial with the rotating main shaft, the screw tap is connected to one end of the rotating main shaft, the workpiece clamp is provided with a driving mechanism for driving the workpiece clamp to reciprocate along the linear direction, the moving direction of the workpiece clamp is consistent with the axial direction of the screw tap, the driving mechanism of the workpiece clamp comprises a sliding block, a linear guide rail, a vertical plate, a pushing spring, a positioning rod, a pushing cylinder and a pushing spring, the workpiece clamp is fixedly arranged on the sliding block, the sliding block is in sliding connection with the linear guide rail, the linear guide rail is fixedly arranged on the vertical plate, the vertical plate is fixedly arranged on the equipment rack, a guide hole for the positioning rod to pass through is arranged on the sliding block, and the axial direction of the guide hole is consistent with the moving direction of the sliding block, the positioning rod and the guide hole form a sliding fit, the pushing spring and the pushing spring are both sleeved on the periphery of the positioning rod, the pushing spring and the pushing spring are respectively arranged on two sides of the guide hole on the sliding block, spring limit blocks are respectively arranged at two ends of the positioning rod, one end of the pushing spring is connected with one of the spring limit blocks, the other end of the pushing spring is connected with the end face of the guide hole on the sliding block, one end of the pushing spring is connected with the other spring limit block, and the other end of the pushing spring is connected with the end face of the guide hole on the sliding block; the pushing cylinder and the pushing cylinder are fixedly arranged on the vertical plate, the pushing cylinder is located on one side where the pushing spring is located, the movable end of the pushing cylinder can be connected with the end face of the positioning rod when extending out, the pushing cylinder is located on one side where the pushing spring is located, and the movable end of the pushing cylinder can be connected with the other end face of the positioning rod when extending out.

Further, the method comprises the following steps: and a starting point sensor and an end point sensor are arranged on the vertical plate through a mounting fixing plate and are used for controlling the moving stroke of the sliding block.

Further, the method comprises the following steps: the output shaft of the driving motor is connected with the rotating main shaft through a V-shaped belt transmission structure.

Further, the method comprises the following steps: the workpiece fixture comprises a V-shaped block, a workpiece supporting seat and a rotary pressing cylinder, the workpiece supporting seat is fixedly mounted on the sliding block, the V-shaped block and the rotary pressing cylinder are fixedly mounted on the workpiece supporting seat, the V-shaped block is used for supporting a workpiece, and the rotary pressing cylinder is used for pressing the workpiece.

Further, the method comprises the following steps: the screw tap and the rotating main shaft are both provided with a central through hole, the central through holes of the screw tap and the rotating main shaft are communicated, one end of the rotating main shaft, which is far away from the screw tap, is provided with a rotating joint communicated with the central through hole of the rotating main shaft, and the rotating joint is used for connecting a gas pipe.

Further, the method comprises the following steps: the outer wall of the screw tap is sleeved with a reamer sleeve and a spring, one end, close to the head of the screw tap, of the reamer sleeve is limited by a step surface on the periphery of the screw tap, one end, far away from the head of the screw tap, of the reamer sleeve is connected with the spring, one end of the spring is connected with the reamer sleeve, the other end of the spring is connected with the head end of the rotating main shaft, and the outer diameter specification of the reamer sleeve is matched with the VVT hole of the camshaft workpiece.

Further, the method comprises the following steps: the outer wall of the screw tap is sleeved with a spacer bush and a spring, one end of the spacer bush, which is close to the head of the screw tap, is limited by a step surface on the periphery of the screw tap, one end of the spacer bush, which is far away from the head of the screw tap, is connected with the spring, one end of the spring is connected with the spacer bush, and the other end of the spring is connected with the head end of the rotating main shaft; the outer diameter specification of the spacer bush is matched with the thread through hole of the camshaft workpiece.

Preferably, the reamer sleeve and the spacer sleeve can be combined for use, and the specific structure is as follows: the outer wall of the screw tap is sleeved with a reamer sleeve, a spacer sleeve and a spring, one end of the reamer sleeve, which is close to the head of the screw tap, is limited by a step surface on the periphery of the screw tap, one end of the reamer sleeve, which is far away from the head of the screw tap, is connected with the spacer sleeve, one end of the spacer sleeve, which is close to the head of the screw tap, is connected with the reamer sleeve, the other end of the spacer sleeve is connected with the spring, one end of the spring is connected with the spacer sleeve, and the other end of the spring is connected with the head end of the rotating main shaft; the outer diameter specification of the reamer sleeve is matched with a VVT hole of a camshaft workpiece; the outer diameter specification of the spacer bush is matched with the thread through hole of the camshaft workpiece.

The utility model has the advantages that: when the screw tap is implemented, the propulsion cylinder and the propulsion spring interact to generate propulsion force, the sliding block moves, the workpiece is further close to the screw tap at a low speed, the screw tap is in contact with the screw thread through the compression force (flexible force) of the spring, and the screw thread is not easy to rot teeth. Furthermore, the utility model discloses a screw tap and rotating spindle's central through-hole structure can realize that the clear silk is blown to arrange and cuts and go on in step, can guarantee that threaded hole does not have the iron that remains and cuts. The combined screw tap consists of a spring, a spacer bush, a reamer bush and a screw tap; when the combined screw tap enters the threads for cleaning the threads, the reamer sleeve slowly approaches the VVT hole, and burrs at the position are removed; and at this moment, the spacer bush also enters the threaded through hole, the same-cylindricity deviation of the thread and the threaded through hole can be detected, if the deviation exceeds the range, the spacer bush can be contacted with the threaded through hole to be clamped, and then the combined screw tap is clamped and can not move. If this occurs, it can be determined that the deviation between the screw thread and the screw thread via hole is large. The utility model discloses can remove screw thread via hole and VVT looks through the burr clearly the silk in-process, still can realize the function of the same cylindricality of screw thread and screw thread via hole detection simultaneously.

Drawings

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

Fig. 2 is a schematic structural view of a driving mechanism of the middle workpiece clamp of the present invention.

Fig. 3 is a schematic view of the high-pressure air wire cleaning structure of the present invention.

Fig. 4 is a schematic structural view of the combined tap of the present invention.

Parts in the figures are labeled: the device comprises a V-shaped belt transmission structure 1, a rotary spindle 2, a screw tap 3, a workpiece 4, a V-shaped block 5, a workpiece supporting seat 6, a rotary pressing cylinder 7, a sliding block 8, a linear guide rail 9, a vertical plate 10, a pushing spring 11, a positioning rod 12, a pushing cylinder 13, a pushing cylinder 14, a pushing spring 15, a starting point sensor 16, an installation fixing plate 17, an end point sensor 18, a driving motor 19, a central through hole 20, a rotary joint 21, an air pipe 22, a reamer sleeve 23, a spring 24, a spacer 25, a VVT hole 26 and a threaded through hole 27.

Detailed Description

The present invention will be further explained with reference to the drawings and the embodiments.

As shown in fig. 1 to 4, the utility model comprises a driving motor 19, a rotating spindle 2, a screw tap 3 and a work holder, the driving motor 19 is fixedly arranged on the equipment frame, an output shaft of the driving motor 19 is connected with the rotating spindle 2 through a transmission assembly, the screw tap 3 is coaxial with the rotating spindle 2, the screw tap 3 is connected with one end of the rotating spindle 2, the work holder is provided with a driving mechanism for driving the work holder to reciprocate along a linear direction, the moving direction of the work holder is consistent with the axial direction of the screw tap 3, the driving mechanism of the work holder comprises a slide block 8, a linear guide 9, a vertical plate 10, a pushing spring 11, a positioning rod 12, a pushing cylinder 13, a pushing cylinder 14 and a pushing spring 15, the work holder is fixedly arranged on the slide block 8, the slide block 8 is in sliding connection with the linear guide 9, the linear guide 9 is fixedly arranged on the vertical plate 10, the vertical plate 10 is fixedly arranged on the equipment frame, a guide hole for a positioning rod 12 to pass through is formed in the sliding block 8, the axis direction of the guide hole is consistent with the moving direction of the sliding block 8, the positioning rod 12 is in sliding fit with the guide hole, a pushing spring 11 and a pushing spring 15 are both sleeved on the periphery of the positioning rod 12, the pushing spring 11 and the pushing spring 15 are respectively arranged on two sides of the guide hole in the sliding block 8, spring limit blocks are respectively arranged at two ends of the positioning rod 12, one end of the pushing spring 11 is connected with one of the spring limit blocks, the other end of the pushing spring 11 is connected with the end face of the guide hole in the sliding block 8, one end of the pushing spring 15 is connected with the other spring limit block, and the other end of the pushing spring is connected with the end face of the guide hole in the sliding block 8; the pushing cylinder 13 and the pushing cylinder 14 are both fixedly arranged on the vertical plate 10, the pushing cylinder 13 is located on one side of the pushing spring 11, the movable end of the pushing cylinder 13 can be connected with the end face of the positioning rod 12 when extending out, the pushing cylinder 14 is located on one side of the pushing spring 15, and the movable end of the pushing cylinder 14 can be connected with the other end face of the positioning rod 12 when extending out. Specifically, the head end of the rotating main shaft 2 is matched with the screw tap 3 through Moh type No. 4 taper to drive the screw tap 3 to rotate. The pushing cylinder 13 is connected to the vertical plate 10 through a screw, and the pushing cylinder 14 is also connected to the vertical plate 10 through a screw. The start point sensor 16 is connected to the vertical plate 10 via an L fixing plate 17, and the end point sensor 18 is connected to the vertical plate 10 via the L fixing plate 17.

For automatic control, a starting point sensor 16 and an end point sensor 18 are mounted on the vertical plate 10 through a mounting fixing plate 17, and the starting point sensor 16 and the end point sensor 18 are used for controlling the moving stroke of the slide block 8. Specifically, the mounting fixing plate 17 may be an L-shaped fixing plate.

The working principle of the utility model is as follows: putting a workpiece 4 on the V-shaped block 5, pressing a machine tool starting button, driving a motor 19 to rotate in a forward direction, simultaneously rotating a pressing cylinder 7 to rotate to press the workpiece, driving a pushing cylinder 13 to start and push a pushing spring 11, when the pushing spring 11 overcomes the sliding resistance of a sliding block 8, the sliding block 8 starts to approach a screw tap 3, when a starting point sensor 16 lights and pushes the pushing cylinder 13 to retreat, the situation shows that the screw tap 3 is sleeved with a plurality of threads before the thread, and the screw tap 3 rotates in a forward direction all the time to clear the thread; when the end point sensor lamp 18 is turned on, the tap 3 is indicated to be cleaned to the bottom of the thread, the driving motor 19 is braked and stopped and starts to rotate reversely, the tap 3 starts to slowly withdraw from the thread of the workpiece, when the start point sensor 16 is turned on again, the tap 3 is indicated to be completely withdrawn from the thread, the pushing cylinder 14 is started to push the pushing spring 15, after the pushing spring 15 overcomes the sliding resistance of the sliding block 8, the sliding block 8 starts to be away from the tap 3 and retracts to the original position of the machine tool, and the cleaning of the thread of the workpiece 4 is finished. When the screw tap is implemented, the screw tap 3 is contacted with the screw thread through the compression force (flexible force) of the spring, and the screw thread is not easy to rot. The position of the starting point sensor 16 and the position of the end point sensor 18 can be determined through experiments, the propulsion cylinder 13 interacts with the propulsion spring 11 to generate propulsion force, the workpiece 4 is enabled to slowly approach the screw tap 3, the position of the starting point sensor 16 is adjusted to ensure that the screw tap 3 is just sleeved in the screw thread to clear the screw thread when the lamp is on, and the propulsion cylinder 13 is pushed back at the moment; adjusting the position of the end point sensor 18, when the thread cleaning depth reaches the time, the lamp of the end point sensor just lights, at the time, the thread cleaning depth meets the requirement, the driving motor 19 rotates reversely, the workpiece 4 starts to be away from the screw tap 3, when the position of the workpiece 4 reaches the start point sensor 16, the lamp lights, the push-out air cylinder 14 and the push-out spring 15 interact to generate push-out force, so that the workpiece 4 returns to the original position, the driving motor 19 stops, and the thread cleaning is completed.

In order to make the structure simple and reliable, the output shaft of the driving motor 19 is connected with the rotating main shaft 2 through the V-shaped belt transmission structure 1. Specifically, the belt pulley and the rotating main shaft 2 realize that the belt pulley drives the rotating main shaft 2 to rotate through a positioning key.

For simple and reliable structure, the preferred structural style of the workpiece clamp is as follows: including V type piece 5, work piece supporting seat 6 and rotatory cylinder 7 that compresses tightly, 6 fixed mounting of work piece supporting seat are on slider 8, and V type piece 5 and the equal fixed mounting of rotatory cylinder 7 that compresses tightly are on work piece supporting seat 6, and V type piece 5 is used for supporting work piece 4, and rotatory cylinder 7 that compresses tightly is used for compressing tightly work piece 4. Specifically, the V-shaped block 5 and the workpiece supporting seat 6 can be connected through a screw and a key block, the rotary compression cylinder 7 can be connected to the workpiece supporting seat 6 through a screw, and the workpiece supporting seat 6 can be connected to the sliding block 8 through a screw and a key block.

Referring to fig. 3, preferably, the tap 3 and the rotary spindle 2 both have a central through hole 20, and the central through holes 20 of the tap and the rotary spindle 2 are communicated, and one end of the rotary spindle 2 away from the tap 3 is provided with a rotary joint 21 communicated with the central through hole 20 of the rotary spindle, and the rotary joint 21 is used for connecting an air pipe 22. During implementation, when the thread is cleaned, the middle part of the screw tap 3 is ventilated to blow the threaded hole. The utility model discloses a screw tap 3 and the central through-hole 20 structure of rotating spindle 2 realize that the clear silk is blown to arrange and is cut going on in step, can guarantee that threaded hole does not have the iron that remains and cut.

The utility model discloses the clear silk work that is particularly useful for the camshaft work piece, during concrete implementation, still can adopt following preferred embodiment: the outer wall cover of screw tap 3 is equipped with reamer cover 23 and spring 24, and the one end that reamer cover 23 is close to the screw tap 3 head relies on the step face of screw tap 3 periphery to carry on spacingly, and the one end of keeping away from the screw tap 3 head meets with spring 24, and the one end of spring 24 meets with reamer cover 23, and the other end meets with the head end of rotary main shaft 2, and the external diameter specification of reamer cover 23 and the VVT hole 26 looks adaptation of camshaft work piece. The combined screw tap is composed of a spring 24, a reamer sleeve 23 and a screw tap 3; while the combined tap enters the threads for cleaning, the reamer sleeve 23 slowly approaches the VVT hole 26, and burrs at the position are removed.

A spacer bush 25 and a spring 24 are sleeved on the outer wall of the screw tap 3, one end, close to the head of the screw tap 3, of the spacer bush 25 is limited by means of a step surface on the periphery of the screw tap 3, one end, far away from the head of the screw tap 3, of the spacer bush 25 is connected with the spring 24, one end of the spring 24 is connected with the spacer bush 25, and the other end of the spring is connected with the head end of the rotating main shaft 2; the outer diameter of the spacer 25 is matched with the thread through hole of the camshaft workpiece. The combined tap is composed of a spacer 25, a spring 24 and a tap 3; when the combined tap enters the threads for thread cleaning, the spacer bush 25 enters the thread through hole 27, the same column degree deviation of the threads and the thread through hole 27 can be detected, if the deviation exceeds the range, the spacer bush 25 can be in contact with the thread through hole 27 and is clamped, and then the combined tap is clamped and cannot move. If this occurs, it can be determined that the deviation of the screw thread from the screw via hole 27 in the same cylinder is large.

Preferably, the reamer sleeve 23 and the spacer sleeve 25 can be applied in combination, and referring to fig. 4, the specific structure is as follows: the reamer sleeve 23, the spacer sleeve 25 and the spring 24 are sleeved on the outer wall of the screw tap 3, one end, close to the head of the screw tap 3, of the reamer sleeve 23 is limited by means of a step surface on the periphery of the screw tap 3, one end, far away from the head of the screw tap 3, of the reamer sleeve 25 is connected with the spacer sleeve 25, one end, close to the head of the screw tap 3, of the spacer sleeve 25 is connected with the reamer sleeve 23, the other end of the spacer sleeve 25 is connected with the spring 24, one end of the spring 24 is connected with the spacer sleeve 25, and the other end of the spring 24 is connected with the head end of the rotating main shaft 2; the outer diameter specification of the reamer sleeve 23 is matched with a VVT hole of a camshaft workpiece; the outer diameter of the spacer 25 is matched with the thread through hole of the camshaft workpiece.

The combined screw tap is composed of a spring 24, a spacer sleeve 25, a reamer sleeve 23 and a screw tap 3; when the combined screw tap enters the threads for cleaning the threads, the reamer sleeve 23 slowly approaches the VVT hole 26, and burrs at the position are removed; and at this moment, the spacer bush 25 also enters the threaded through hole 27, the same cylindricity deviation between the threads and the threaded through hole 27 can be detected, if the deviation exceeds the range, the spacer bush 25 is in contact with the threaded through hole 27 and is clamped, and the combined screw tap is clamped and cannot move. If this occurs, it can be determined that the deviation of the screw thread from the screw via hole 27 in the same cylinder is large. The utility model discloses can remove screw thread via hole 27 and VVT hole 26 and run through the burr mutually clear silk in-process, still can realize detecting the function with the cylindricality to screw thread and screw thread via hole 27 simultaneously.

Claims

1. Multifunctional thread cleaning machine, including driving motor (19), rotating spindle (2), screw tap (3) and work piece holder, driving motor (19) are fixed to be set up in equipment rack, be connected through drive assembly between the output shaft of driving motor (19) and rotating spindle (2), screw tap (3) and rotating spindle (2) coaxial line, the one end at rotating spindle (2) is connected in screw tap (3), work piece holder sets its actuating mechanism who makes reciprocating motion along the linear direction of drive, the moving direction of work piece holder is unanimous with the axis direction of screw tap (3), its characterized in that: the driving mechanism of the workpiece fixture comprises a sliding block (8), a linear guide rail (9), a vertical plate (10), a pushing spring (11), a positioning rod (12), a pushing cylinder (13), a pushing cylinder (14) and a pushing spring (15), the workpiece fixture is fixedly arranged on the sliding block (8), the sliding block (8) is in sliding connection with the linear guide rail (9), the linear guide rail (9) is fixedly arranged on the vertical plate (10), the vertical plate (10) is fixedly arranged on an equipment rack, a guide hole for the positioning rod (12) to pass through is formed in the sliding block (8), the axis direction of the guide hole is consistent with the moving direction of the sliding block (8), the positioning rod (12) is in sliding fit with the guide hole, the pushing spring (11) and the pushing spring (15) are both sleeved on the periphery of the positioning rod (12), the pushing spring (11) and the pushing spring (15) are respectively arranged on two sides of the guide hole in the sliding block (8), two ends of the positioning rod (12) are respectively provided with a spring limiting block, one end of the pushing spring (11) is connected with one spring limiting block, the other end of the pushing spring is connected with the end face of the guide hole on the sliding block (8), one end of the pushing spring (15) is connected with the other spring limiting block, and the other end of the pushing spring is connected with the end face of the guide hole on the sliding block (8); the pushing cylinder (13) and the pushing cylinder (14) are fixedly arranged on the vertical plate (10), the pushing cylinder (13) is located on one side where the pushing spring (11) is located, the movable end of the pushing cylinder (13) can be connected with the end face of the positioning rod (12) when extending out, the pushing cylinder (14) is located on one side where the pushing spring (15) is located, and the movable end of the pushing cylinder (14) can be connected with the other end face of the positioning rod (12) when extending out.

2. The multifunctional thread cutting machine according to claim 1, characterized in that: a starting point sensor (16) and an end point sensor (18) are arranged on the vertical plate (10) through a mounting fixing plate (17), and the starting point sensor (16) and the end point sensor (18) are used for controlling the moving stroke of the sliding block (8).

3. The multifunctional thread cutting machine according to claim 1, characterized in that: the output shaft of the driving motor (19) is connected with the rotating main shaft (2) through a V-shaped belt transmission structure (1).

4. The multifunctional thread cutting machine according to claim 1, characterized in that: the workpiece fixture comprises a V-shaped block (5), a workpiece supporting seat (6) and a rotary pressing cylinder (7), the workpiece supporting seat (6) is fixedly installed on a sliding block (8), the V-shaped block (5) and the rotary pressing cylinder (7) are fixedly installed on the workpiece supporting seat (6), the V-shaped block (5) is used for supporting a workpiece (4), and the rotary pressing cylinder (7) is used for pressing the workpiece (4).

5. The multifunctional thread cutting machine according to any one of claims 1 to 4, characterized in that: the tap (3) and the rotating main shaft (2) are both provided with a central through hole (20), the central through holes (20) of the tap (3) and the rotating main shaft are communicated, one end, far away from the tap (3), of the rotating main shaft (2) is provided with a rotating joint (21) communicated with the central through hole (20), and the rotating joint (21) is used for being connected with an air pipe (22).

6. The multifunctional thread cutting machine according to any one of claims 1 to 4, characterized in that: the outer wall of the screw tap (3) is sleeved with a reamer sleeve (23) and a spring (24), one end, close to the head of the screw tap (3), of the reamer sleeve (23) is limited by means of a step surface on the periphery of the screw tap (3), one end, far away from the head of the screw tap (3), of the reamer sleeve is connected with the spring (24), one end of the spring (24) is connected with the reamer sleeve (23), the other end of the spring is connected with the head end of the rotating main shaft (2), and the outer diameter specification of the reamer sleeve (23) is matched with a VVT hole (26) of a camshaft workpiece.

7. The multifunctional thread cutting machine according to any one of claims 1 to 4, characterized in that: the outer wall of the screw tap (3) is sleeved with a spacer bush (25) and a spring (24), one end, close to the head of the screw tap (3), of the spacer bush (25) is limited by means of a step surface on the periphery of the screw tap (3), one end, far away from the head of the screw tap (3), of the spacer bush (25) is connected with the spring (24), one end of the spring (24) is connected with the spacer bush (25), and the other end of the spring is connected with the head end of the rotating main shaft (2); the outer diameter specification of the spacer bush (25) is matched with the thread through hole (27) of the camshaft workpiece.

8. The multifunctional thread cutting machine according to any one of claims 1 to 4, characterized in that: the outer wall of the screw tap (3) is sleeved with a reamer sleeve (23), a spacer sleeve (25) and a spring (24), one end, close to the head of the screw tap (3), of the reamer sleeve (23) is limited by means of a step surface on the periphery of the screw tap (3), one end, far away from the head of the screw tap (3), of the reamer sleeve is connected with the spacer sleeve (25), one end, close to the head of the screw tap (3), of the spacer sleeve (25) is connected with the reamer sleeve (23), the other end of the spacer sleeve is connected with the spring (24), one end of the spring (24) is connected with the spacer sleeve (25), and the other end of the spring is connected with the head end of the rotating main shaft (2); the outer diameter specification of the reamer sleeve (23) is matched with a VVT hole (26) of a camshaft workpiece; the outer diameter specification of the spacer bush (25) is matched with the thread through hole (27) of the camshaft workpiece.