TWI616254B - Powered eccentric chuck - Google Patents

Abstract

A power type eccentric chuck has a clamping device for clamping a workpiece and at least one weight member in a manner of axial movement along a rotating main shaft, and the chuck has a transmission mechanism for driving the clamping device to move eccentrically Simultaneously transmitting the counterweight moving in the opposite direction, the chuck provided by the present invention can not only eccentrically rotate the workpiece by the power driving mode, but also maintain the center of gravity and avoid eccentric vibration when the chuck rotates at a high speed.

Description

Powered eccentric chuck

The invention relates to machining, and in particular to a power type eccentric chuck for a machine tool.

In general, if the workpiece needs to be eccentrically machined, the workpiece is mainly placed on the chuck of the machine tool by being offset from the axis of the rotating spindle of the machine tool. This clamping method requires manual stepwise adjustment of each jaw of the chuck. Position, and then clamp the jaws to the workpiece to be machined, the whole process is slow and inefficient.

Moreover, in the above eccentric machining, in order to avoid the vibration of the rotating main shaft during the rotation, the machining accuracy is lowered or the tool tool is damaged, and the rotating main shaft is usually rotated at a low rotation speed, which also causes a reduction in the processing performance. Furthermore, when the rotating main shaft is subjected to a bias load, the rotation is also likely to shorten the service life.

Accordingly, it is a primary object of the present invention to provide a powered eccentric chuck that automatically and efficiently grips a workpiece and changes the amount of eccentric displacement, while maintaining the center of gravity of the center of gravity when the workpiece is eccentrically gripped.

In order to achieve the foregoing object, the power eccentric chuck provided by the present invention has a clamping device for clamping a workpiece and at least one weight member along the axial movement of the rotating main shaft, and the chuck is separately provided. A transmission mechanism is used to drive the eccentric movement of the clamping device to synchronously drive the counterweight to move in the opposite direction. The eccentric chuck provided by the present invention not only can eccentrically rotate the workpiece by the power driving type, but also maintains the center of gravity and avoids the chuck. Eccentric vibration occurs when rotating at high speed.

10‧‧‧ Ontology

12‧‧‧ front chute

14‧‧‧ rear chute

16‧‧‧ center hole

18‧‧‧ chamber

20‧‧‧Clamping device

22‧‧‧Sliding seat

23‧‧‧ wing

24‧‧‧ Positioning parts

25‧‧‧ bearing

26‧‧‧ linkages

27‧‧‧ Guide slot

28‧‧‧Fixed parts

29‧‧‧Rotary cylinder rod

30‧‧‧With weights

40‧‧‧Transmission mechanism

42‧‧‧ Gear shaft

50‧‧‧Hydraulic cylinder

52‧‧‧Piston

70‧‧‧stops

72‧‧‧ pads

80‧‧‧ oil guide

82‧‧‧External tubing

BRIEF DESCRIPTION OF THE DRAWINGS In the following, the present invention will be described in detail with reference to the accompanying drawings in which: FIG. 1 is a perspective view of a preferred embodiment of the present invention; 3 is an exploded perspective view of a preferred embodiment of the present invention; FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. 3; and FIG. 5 is a cross-sectional view taken at 5-5 of FIG. FIG. 6 to FIG. 9 are schematic views showing the operation of a preferred embodiment of the present invention; FIG. 10 is a cross-sectional view showing mainly an eccentric displacement state; and FIGS. 11 and 12 are side views of the present invention, mainly showing another Implement the use status.

Referring to Figures 1 to 5, a power type eccentric chuck according to a preferred embodiment of the present invention comprises a body 10, a clamping device 20, and a weight member 30. And a transmission mechanism 40, the body 10 is substantially cylindrical and can be used to mount a rotating spindle of a machine tool. The main body 10 has a front chute 12, a rear chute 14, and a central hole 16 connecting the front and rear chutes 12, 14. The peripheral wall of the body 10 is provided with a two-chamber 18, and the two chambers 18 are symmetrically located on the body 10. The two sides. The transmission mechanism 40 includes two gear shafts 42. The gear shafts 42 are rotatably disposed inside the chambers 18. The tooth profiles of the gear shafts 42 are respectively exposed to the front and rear chutes 12, 14. The bottom side of the body 10 is further provided with a hydraulic cylinder 50. The hydraulic cylinder 50 has a piston 52 that can be controlled by the oil pressure to drive the clamping device 20.

The clamping device 20 includes a hollow sliding seat 22, and the sliding seat 22 is provided with a positioning member 24 for clamping the workpiece. The positioning member 24 of the preferred embodiment is a sleeve, and a hollow joint is disposed at the rear end of the positioning member 24. The center of the linking member 26 is provided with a fixing member 28. The positioning member 24 can move the linking member 26 and the positioning member 24 relative to the sliding seat 22 by a rotary cylinder pull rod 29, thereby achieving a clamping or loosening positioning member. The role of 24.

The sliding seat 22 is disposed on the front chute 12 of the main body 10. The linking member 26 is disposed in the direction of the rear chute 14 via the central hole 16 of the main body 10. The sliding seat 22 has a wing portion 23 on each of the two sides, and the two wing portions 23 are respectively placed The wall of the front chute 12 of the body 10 and the two gear shafts 42 are engaged, and the entire clamping device 20 can be driven by the gear shaft 42 to slide inside the front chute 12. The weight member 30 is located at the rear chute 14 of the body 10. The front end surface of the weight member 30 is engaged with the two gear shafts 42, so that the weight member 30 is also driven by the gear shaft 42 to slide along the rear chute 14, and then The two sides of the gear shaft 42 are respectively engaged with the weight member 30 and the sliding seat 22. When the gear shaft 42 rotates when the chamber 18 rotates, the moving direction of the clamping device 20 is opposite to the moving direction of the weight member 30.

The center of the rear end of the linking member 26 has an elongated guiding groove 27, and the extending direction of the guiding groove 27 is perpendicular to the axial direction of the positioning member 24, and the fixing member 28 is disposed through the guiding groove 27, and The bearing 25 spaced apart from the fixing member 28 engages the linking member 26 such that the clamping device 20 is movable relative to the fixing member 28 in the axial direction perpendicular to the positioning member 24.

As shown in FIG. 2 and FIG. 6 to FIG. 8 , the body 10 is provided with two movable stoppers 70 and a spacer 72 on the lateral side of the sliding seat 22 , and the stopper 70 can be controlled by oil pressure. Moving between a position (Fig. 6) and a second position (Fig. 8), when the blocking member 70 is at the first position, the sliding seat 22 is abutted, and the sliding seat 22 is formed at the center of the body 10. When the stopper 70 is moved to the second position, it is moved away from the sliding seat 22, so that the sliding seat 22 can be moved to the contact pad 72 toward the eccentric position, and the eccentric distance of the sliding seat 22 is controlled.

An oil guiding seat 80 is further disposed in the body 10, and the oil guiding seat 80 has a passage communicating with the external oil pipe 82, the hydraulic cylinder 50 and the stopping member 70. The oil guiding seat 80 can be disposed at the center of the weight member 30, and Reduce the overall size.

Referring to FIG. 4 and FIG. 10, when the workpiece to be processed is inserted into the front end of the positioning member 24, the positioning member 24 can be pulled by the pulling rod 29 and the fixing member 28 to be bundled on the sliding seat 22 to position the workpiece. Then, the hydraulic circuit is used to control the flow of the hydraulic oil through the oil guiding block 80 in the hydraulic cylinder 50, thereby driving the piston 52 to push the clamping device 20 to move in the eccentric direction (FIG. 9) to abut the spacer 72 to make the workpiece. It can be quickly and automatically moved to a predetermined eccentric machining position, and the weight member 30 will be reversely moved with the sliding seat 22 due to the rotation of the two gear shafts 42, and the overall center of gravity of the overall eccentric chuck and the workpiece is maintained at the center of gravity. Eccentric vibration does not occur when the chuck is rotated at a high speed. Furthermore, since the weight of the workpiece may vary with the processing requirements, the weight member 30 cannot be surely balanced, so that the weight can be locked to the weight member 30 to change its weight, and the adjustment can be achieved. Heavy balance effect.

Further, as shown in FIG. 11 and FIG. 12, the sliding seat of the present invention can be provided with a piston 60 that moves in a linear axial direction and two jaws 62 that can be rotated therewith, and the connecting member 26 can be disposed on the piston 60. The clamping jaw 62 is driven to fix or release the workpiece.

By the above-mentioned constituent members, the present invention can automatically and efficiently hold the workpiece, and at the same time, the workpiece can be processed in an eccentric state, and the overall eccentric chuck and the overall center of gravity of the workpiece are maintained at a stable position, thereby improving processing precision and quality. The invention can utilize the pads of different thicknesses to conveniently and quickly control the amount of eccentric displacement, improve the processing efficiency, and at the same time, the overall volume and size are relatively simple.

Claims (7)

A power type eccentric chuck is mounted on a rotating main shaft of a machine tool. The power type eccentric chuck comprises: a body; a clamping device is mounted on the body reciprocally along a moving path, The clamping device can clamp the workpiece in a direction perpendicular to the moving path; a weight member is disposed on the body to reciprocate along the straight path of the body, and the linear path is parallel to the clamping device a moving mechanism; a transmission mechanism is disposed on the body for moving the weight member in a reverse direction when the clamping device is moved; wherein the body is provided with at least one side of the clamping device a moving stop member and a pad, the at least one stop member being controllable to move between a first position and a second position, wherein the at least one stop member is located at the first position to abut a clamping device, the clamping device is formed at a position of a center of the body, and when the blocking member is moved to the second position, the clamping device is moved away from the eccentric position to contact The spacer. The power type eccentric chuck according to claim 1, wherein the body has a front chute, a rear chute, and a center hole connecting the front chute and the rear chute, the clamping device Having a sliding seat disposed on the front chute, the clamping device has a linking member disposed through the central hole toward the rear chute, the linking member movably coupling a fixing member, so that the clamping device can be opposite to the clamping device The body moves in an eccentric direction. The power type eccentric chuck according to claim 2, wherein the linking member has a guiding groove, and the extending direction of the guiding groove is perpendicular to the axial direction of the sliding seat. The fixing member is disposed in the guiding groove, and the connecting member is clamped by two bearings spaced apart from the fixing member, so that the clamping device can move relative to the fixing member in an axial direction perpendicular to the positioning member. . The power type eccentric chuck according to claim 2, wherein the body is provided with two chambers symmetrically located on two sides of the body, the transmission mechanism comprises two gear shafts, and the gear shafts are rotatable The grounding portion is disposed in each of the chambers, and is engaged with the sliding seat and the weight member located in the rear sliding slot. When the clamping device moves, the clamping device can respectively drive the weight member to synchronously and reversely move. The power type eccentric chuck according to claim 1, wherein the body is further provided with a hydraulic cylinder having a piston that can be controlled by oil pressure to drive the clamping device. The power type eccentric chuck according to claim 1, wherein the weight member can lock a predetermined number of weights on the weight member, thereby adjusting the weight of the entire weight according to requirements. The power type eccentric chuck according to claim 1, wherein the clamping device is provided with a positioning member for clamping the workpiece, the positioning member is a piston moving in a linear axial direction and a clamp capable of rotating therewith. The claw can drive the two jaws to fix or release the workpiece.