CN210648868U

CN210648868U - Tapping device

Info

Publication number: CN210648868U
Application number: CN201920997770.6U
Authority: CN
Inventors: 丁幼先
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-06-29
Filing date: 2019-06-29
Publication date: 2020-06-02
Anticipated expiration: 2029-06-29

Abstract

A tapping device comprises a box body (4), wherein a driving shaft (14) and a driven shaft (13) are supported in the box body, the driving shaft drives the driven shaft to rotate through a gear, the driven shaft can axially move on the box body, a screw tap (3) is installed at one end of the driven shaft, the tapping device further comprises a bogie, a rotating wheel (18) is arranged on the lower portion of the bogie, and the rotating wheel is attached to the driven shaft in a pressure mode. The tapping device is characterized in that the rotating wheel can intersect with the driven shaft at a certain angle, axial movement can be generated when the driven shaft rotates, the intersecting angle of the rotating wheel and the driven shaft can be changed by adjusting the rotating angle of the rotating shaft, so that the axial movement speed or the movement direction of the driven shaft is changed, the magnetic torque protection device is arranged on the driving shaft, when the load torque is overlarge, the output torque can be automatically reduced, and the screw tap is prevented from being broken.

Description

Tapping device

Technical Field

The invention relates to a tapping device for processing internal threads.

Background

The internal thread is usually processed by a tapping method, the working process of the tapping device is that a main shaft drives a screw tap to make spiral motion, the screw tap enters a workpiece in forward rotation, the screw tap exits the workpiece in reverse rotation, and the forward rotation and the reverse rotation of the main shaft can be controlled by a travel switch to realize automatic processing; the spiral motion of the main shaft is adapted to the thread pitch of the screw tap, namely the axial movement distance of the main shaft when the main shaft rotates one time is equal to the thread pitch; as the pitch of the tap changes, the rate at which the spindle moves axially also changes. The change of the axial movement rate of the main shaft is generally realized by a gear speed change or speed regulation motor, which makes the structure of the tapping device complicated; in addition, when the screw tap is abnormally blocked, the screw tap is broken due to overlarge load torque; there is a need for improvement.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a tapping device which is simple in structure and can conveniently change the axial movement rate of a driven shaft; when the load torque is too large, the output torque can be automatically reduced, and the screw tap is protected from being broken.

The technical scheme of the invention is that the tapping device comprises a box body 4, a driving shaft 14 and a driven shaft 13 are supported in the box body, a driving gear 20 is fixedly installed on the driving shaft, a driven gear 12 is sleeved on the driven shaft, the driving gear is meshed with the driven gear, the sum of the thicknesses of the driving gear and the driven gear is larger than the length of a processed thread, the driven shaft can axially move on the box body, and a screw tap 3 is installed at one end of the driven shaft, the tapping device is characterized in that a pipe part extends out of the left end face of the driven gear, a bolt 24 is screwed on the wall of the pipe part, the steering frame further comprises a fork body 10, a rotating wheel 18 is supported at the lower part of the fork body, the rotating wheel is attached to the driven shaft, a rotating shaft 6 is vertically connected to the top of the fork body, the rotating shaft extends out of a shaft seat 5 on a top cover 11 of, the spring is positioned between the fork body and the shaft seat.

The axial movement principle of the driven shaft is that the rotating wheel can intersect with the driven shaft at a certain angle, when the driven shaft rotates, the driven shaft can axially move under the action of the rotating wheel, the intersecting angle of the rotating wheel and the driven shaft can be changed by adjusting the rotating angle of the rotating shaft, so that the axial movement rate of the driven shaft is changed, and when the axis of the rotating wheel is parallel to the driven shaft, the driven shaft does not move; when the angle between the axis of the rotating wheel and the driven shaft is increased, the axial moving speed of the driven shaft is also increased; when the angle between the axis of the runner and the driven shaft is opposite, the moving direction of the driven shaft is also opposite.

The tapping device has the beneficial effects that the structure is simple, and the axial movement speed and direction of the main shaft can be conveniently changed so as to adapt to the processing of positive internal threads and reverse internal threads.

Drawings

FIG. 1 is a schematic structural view of the present invention.

Fig. 2 is a view taken along direction a of fig. 1.

Fig. 3 is an enlarged view of the portion C of fig. 1, showing the structure of the torque protection device.

The reference symbols respectively denote: 1-bottom plate, 2-clamp, 3-screw tap, 4-box, 5-axle seat, 6-rotating shaft, 7-lug, 8-adjusting disk, 9-spring, 10-fork, 11-top cover, 12-driven gear, 13-driven shaft, 14-driving shaft, 15-supporting plate, 16-collision block, 17-travel switch, 18-rotating wheel, 19-mandrel, 20-driving gear, 21-screw, 22-arc groove, 23-dividing line, 24-bolt, 25-speed reducer, 26-output shaft, 27-vertical plate, 28-first magnetic steel, 29-second magnetic steel, 30-connecting sleeve, 31-key pin, 32-fastening screw, 33-internal thread sleeve, 34-screw rod, 35-rod body.

Detailed Description

Specific embodiments of the present invention will now be described with reference to the accompanying drawings.

A tapping device comprises a box body 4, a driving shaft 14 and a driven shaft 13 are supported in the box body, a driving gear 20 is fixedly mounted on the driving shaft, a driven gear 12 is sleeved on the driven shaft, a pipe portion extends out of the left end face of the driven gear, a bolt 24 is screwed on the wall of the pipe portion, the driven gear can be fixed on the driven shaft by screwing the bolt, the driving gear is meshed with the driven gear, the sum of the thicknesses of the driving gear and the driven gear is larger than the length of a processed thread, the driven shaft can move axially on the box body, and a screw tap 3 is mounted at one end of the driven shaft.

The tapping device further comprises a bogie, the bogie comprises a fork body 10, a mandrel 19 is inserted into the fork end part of the lower portion of the fork body, a rotating wheel 18 is fixed on the mandrel, and the rotating wheel is located between the fork ends; the top of the fork body is vertically and fixedly connected with a rotating shaft 6, the rotating shaft extends out of a shaft seat 5 on a top cover 11 of the box body, the shaft seat is fixed on the top cover, a screw (not shown in the drawing) is arranged on the wall of the shaft seat to fix the rotating shaft, a spring 9 is sleeved on the rotating shaft, and the spring is positioned between the fork body and the shaft seat to enable the rotating wheel to be tightly attached to the driven shaft.

In order to further facilitate the adjustment of the angle of the rotating wheel, the upper part of the rotating shaft is a flat convex block 7, an adjusting disc 8 is sleeved on the convex block in a matching way, an arc-shaped groove 22 is arranged on the adjusting disc, a screw 21 penetrates through the arc-shaped groove and is screwed on the shaft seat, and a dividing line 23 is carved at the edge of the end surface of the shaft seat. When the angle of the rotating wheel is adjusted, the screw is loosened, the adjusting disc is rotated to a specified angle, and then the screw is screwed down.

The right side of the box body is connected with a supporting plate 15, travel switches 17 are respectively arranged on the left side and the right side of the supporting plate, a collision block 16 is arranged at the other end of the driven shaft, and the collision block is positioned between the two travel switches.

A bottom plate 1 extends out of the left side of the bottom of the box body, a clamp 2 for automatically loading and unloading workpieces is mounted on the bottom plate, and the clamp can be designed according to the shapes of the workpieces.

The tapping device works in the process that (taking machining of positive threads as an example), a workpiece is clamped on a clamp, a speed reducer 25 is started, the speed reducer drives a driving shaft to rotate, the driving shaft drives a driven shaft to rotate, the driven shaft moves to the left under the action of a rotating wheel, a screw tap on the driven shaft taps the workpiece, when a collision block contacts a travel switch on the left side, the speed reducer rotates reversely, the screw tap moves to the left on the driven shaft exits the workpiece, and when the collision block contacts a travel switch on the right side, the speed reducer stops rotating.

When processing the blind hole screw thread, if travel switch on the left side is malfunctioning, the screw tap can collide with the hole bottom of the blind hole of work piece, causes the accident, because driven gear is through the bolt fastening on the driven shaft, consequently the position of driven gear on the driven shaft can be adjusted according to the degree of depth of blind hole, and when the screw tap was close to the hole bottom of blind hole, driven gear and driving gear disengaged.

A torque protection device is also installed between the driving shaft and the driving gear, as shown in fig. 3, the torque protection device comprises a connecting sleeve 30 connected with the driving shaft and an output shaft 26 connected with the driven gear, the output shaft is supported by a vertical plate 27, a first magnetic steel 28 extends from the right end of the output shaft, a second magnetic steel 29 extends from the left end of the connecting sleeve, the cross-sectional shapes of the first magnetic steel and the second magnetic steel are E-shaped, namely, a concave part is arranged on the disk body, the edge part of the disk body of the first magnetic steel is an N pole, the center part of the first magnetic steel is an S pole, the edge part of the disk body of the second magnetic steel is an S pole, the center part of the second magnetic steel is an N pole, the first magnetic steel and the second magnetic steel attract each other, the connecting sleeve is sleeved on the driving shaft, a key groove is arranged on the inner wall of the connecting sleeve, a key pin 31 is embedded on the driving, an internal thread sleeve 33 is inserted in the output shaft, a fastening screw 32 is screwed on the right end of the output shaft in the radial direction, the end part of the fastening screw is clamped in a groove on the outer circumference of the internal thread sleeve, and a screw is screwed in the internal thread sleeve. The riser is installed in the bottom of box, and the riser is located between the disk body of driven gear and first magnet steel.

In order to improve the concentricity of the first magnetic steel and the second magnetic steel, a rod body 35 is further arranged between the screw rod and the disk body of the second magnetic steel, the screw rod and the rod body are integrally formed, the rod body is inserted into the hole of the driven shaft in a matching way, and the diameter of the rod body is larger than that of the screw rod.

The manufacturing steps of the first magnetic steel and the second magnetic steel are as follows: the first magnetic steel and the second magnetic steel are machined and formed, and then the magnetic poles are magnetized.

The torque adjusting device has the working principle that the first magnetic steel and the second magnetic steel attract each other, torque is transmitted through magnetic force, the driving shaft drives the output shaft to synchronously rotate, when load torque is larger than the magnetic torque, the rotating speed of the output shaft is lower than that of the driving shaft, the screw rod rotates in the output shaft, the second magnetic steel moves rightwards, the distance between the first magnetic steel and the second magnetic steel is increased, the attraction force is reduced, the magnetic torque is reduced, the output shaft stops rotating, and when the screw rod exits from the internal thread sleeve, the second magnetic steel stops moving rightwards.

The magnetic torque setting method comprises the steps that the fastening screw is loosened, but the end part of the fastening screw is clamped in the groove on the outer circumference of the internal thread sleeve, the internal thread sleeve is rotated, the gap between the first magnetic steel and the second magnetic steel is adjusted, the smaller the distance between the first magnetic steel and the second magnetic steel is, the larger the attraction force between the first magnetic steel and the second magnetic steel is, and the larger the magnetic torque is. When the distance between the first magnetic steel and the second magnetic steel is proper, the fastening screw is screwed down, so that the internal thread sleeve is fixed on the output shaft.

When needing to explain, after carrying out load moment of torsion overload protection, the screw rod can withdraw from the internal thread cover, and the interval increase of first magnet steel and second magnet steel, nevertheless first magnet steel and second magnet steel have the appeal in addition, and the screw rod can contact with the oral area of internal thread, rotates the internal thread cover and can screw in the internal thread cover with the screw rod.

In order to facilitate the setting of the magnetic torque, a window (not shown in the attached drawings) is arranged on the side wall of the box body, the hand of an operator can extend into the window, and the window is sealed by a cover plate at ordinary times.

The torque adjusting device is characterized in that torque is transmitted through magnetic force, and when the load torque is larger than the magnetic force torque, the magnetic force torque automatically reduces, so that the screw tap can be reliably prevented from being broken; there is no friction between first magnet steel and the second magnet steel, can improve torque adjusting device's life.

Claims

1. A tapping device comprises a box body (4), a driving shaft (14) and a driven shaft (13) are supported in the box body, a driving gear (20) is mounted on the driving shaft, a driven gear (12) is sleeved on the driven shaft and meshed with the driving gear, the thickness sum size of the driving gear and the driven gear is larger than the length size of a processed thread, the driven shaft can axially move on the box body, and a screw tap (3) is mounted at one end of the driven shaft, the tapping device is characterized in that a pipe portion extends out of the left end face of the driven gear, a bolt (24) is screwed on the wall of the pipe portion, the tapping device further comprises a bogie, the bogie comprises a fork body (10), a rotating wheel (18) is supported at the lower portion of the fork body and attached to the driven shaft, a rotating shaft (6) is vertically connected to the top of the fork body, and extends out, the rotating shaft can be fixed on the shaft seat, and a spring (9) is sleeved on the rotating shaft and is positioned between the fork body and the shaft seat.

2. Tapping device according to claim 1, wherein the upper part of the rotating shaft is a flat projection (7), on which an adjusting disk (8) is fittingly sleeved, the adjusting disk is provided with an arc-shaped slot (22), a screw (21) is screwed on the shaft seat through the arc-shaped slot, and the edge of the end surface of the shaft seat is engraved with a graduation line (23).

3. The tapping device as claimed in claim 1 or 2, wherein a torque protection device is further installed between the driving shaft and the driving gear, the torque protection device comprises a connecting sleeve (30) connected with the driving shaft and an output shaft (26) connected with the driving gear, the output shaft is supported by a vertical plate (27), a first magnetic steel (28) extends from the right end of the output shaft, a second magnetic steel (29) extends from the left end of the connecting sleeve, the cross-sectional shapes of the first magnetic steel and the second magnetic steel are E-shaped, the first magnetic steel and the second magnetic steel attract each other, the connecting sleeve is sleeved on the driving shaft, a key groove is formed in the inner wall of the connecting sleeve, a key pin (31) is embedded in the driving shaft, a screw rod (34) extends leftwards from the disk body of the second magnetic steel, an internal thread sleeve (33) is inserted in the output shaft, a fastening screw (32) is radially screwed at the, the screw rod is screwed in the internal thread sleeve.