JPH11347869A - Clamp device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small clamp device with a clamp position receiving no restraint from configuration of a machined object and with stable clamp force. SOLUTION: A rotation shaft 2 rotated by a rotating mechanism 9 is journalled to a body 1, a slide hole 4a of a clamp arm 4 is playingly engaged with the rotation shaft 2 to rovingly support the clamp arm 4, a roving spring 16 for making the clamp arm 4 roving is wound around the rotation shaft 2, a sliding mechanism 14 for sliding the clamp arm 4 back and forth with rotation of the rotation shaft 2 is provided, a clamp mechanism of the clamp arm 4 for lifting up and down a plunger 5 with a clamp disk spring 6 and oil hydraulics is provided, and an oil drain throttle valve that can adjust throttle amount is provided for a manifold 10 having a supply hole 11 for supplying oil pressure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clamp device which is particularly effective for a machine tool such as a lathe or a turning machine, on which a workpiece is rotated, or a machine tool which hinders machining when a hydraulic hose is connected. .

[0002]

2. Description of the Related Art Conventionally, there is a clamp device for fixing a workpiece to a machine tool as disclosed in Japanese Utility Model Publication No. Sho 56-10498, as shown in FIGS.
The clamp arm 20 for fixing the workpiece performs a clamp operation and an unclamping operation with the rotation shaft 21 as a fulcrum, and a swing operation to the clamp position and the retreat position with the rotation shaft 21 as a center.
0 is performed by the plunger 24 mounted in the cylinder 23 of the main body 22 by the urging force of the clamp spring 25 composed of a coil spring.
The unclamping operation of 0 is performed by supplying a hydraulic pressure to the hydraulic operating chamber 26 of the cylinder body 23 against the urging force of the clamp spring 25, and the swing operation of the clamp arm 20 is controlled by the cam of the rotating shaft 21. The operation is performed by hydraulically operating a spool 28 that comes into contact with the spool 27. For this reason, if the workpiece within the radius of rotation in which the clamp arm 20 rotates has a convexity or the like, it cannot be clamped due to interference.
There is a problem that the clamp position of the workpiece to be clamped is restricted. In addition, since the clamp spring 25 uses a coil spring, there is a problem that the outer diameter becomes large and the size of the apparatus increases in order to obtain a predetermined clamping force. There is also a problem that the workpiece is easily caused and the clamping of the workpiece becomes unstable.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a compact clamping device which is not restricted in clamping position by the shape of a workpiece and has a stable clamping force.

[0004]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a rotating shaft which is rotated by a rotating mechanism, which is supported by a main body, and a slide hole of a clamp arm is loosely fitted to the rotating shaft. The clamp arm is freely movably supported, and a floating spring that allows the clamp arm to float freely is wound around a rotary shaft, and a slide mechanism is provided for sliding the clamp arm back and forth by rotation of the rotary shaft.
Claims: A clamp device that has a clamp mechanism of a clamp arm that moves a plunger up and down by a clamp disc spring and hydraulic pressure, and a throttle valve that is capable of adjusting a throttle amount and is provided in a manifold having a supply port that supplies hydraulic pressure. According to the first aspect of the present invention, in the first aspect of the present invention, the clamp device in which the hydraulic hose connected to the supply port is detachable by a one-touch joint is the second aspect of the present invention. The invention according to claim 3, wherein the clamp device comprises a cam plate whose mechanism is loosely fitted to the rotation shaft and a pin of a clamp arm engaged with a cam groove formed in the cam plate. According to the third aspect of the invention, the plunger in which the clamp mechanism is mounted on the cylinder cylinder of the main body, the hydraulic operating chamber for lowering the plunger, and the plunger A plurality of billing more becomes clamping device a disc clamping disc springs that combine spring term to 4
Invention.

[0005]

Next, a preferred embodiment of the present invention will be described in detail with reference to FIGS. Reference numeral 1 denotes a main body. The main body 1 is provided with a rotating shaft 2 for holding a clamp arm 4 described later, and a clamp mechanism 3 for performing a clamp operation / unclamping operation of the clamp arm 4 described later. . Reference numeral 4 denotes a clamp arm for performing a clamp operation and an unclamping operation. The clamp arm 4 has a slide hole 4a formed in the front half thereof, the shaft of the rotary shaft 2 being engaged, and a lock nut at the upper end of the shaft. 2a is screwed to support the clamp arm 4 in a freely movable manner. The clamp mechanism 3 includes a cover 1b for closing the cylinder tube 1a of the main body 1, a plunger 5 mounted in the cylinder tube 1a, and a spring retainer 5a screwed to the tip of the plunger 5 and the cover 1b. The plunger 5 includes a clamp disc spring 6 for raising the plunger to be moved, and a hydraulic operating chamber 7 for lowering the plunger formed between the lid 1b and the piston of the plunger 5. The plunger 5 is supplied with hydraulic pressure to the hydraulic operating chamber 7. Thus, the lowering operation of the unclamping is performed, and when the hydraulic pressure is stopped, the plunger 5 is caused to perform the raising operation of the clamp by the clamp disc spring 6. Also,
The clamp disc spring 6 can be adapted to the stroke amount of the plunger 5 by combining a plurality of disc springs 6a. Further, the pin 8 screwed to the tip of the plunger 5 is slidably fitted in the long groove 4c of the clamp arm 4, so that the clamp arm 4 is not rotated when the rotating shaft 2 rotates.

Reference numeral 9 denotes a rotating mechanism for rotating the rotating shaft 2. The rotating mechanism 9 is formed at the base of the rotating shaft 2 as shown in FIG.
, A spool 9a having the tip abutting on the cam portion 2c, a cylinder tube 9b into which a piston of the spool 9a is inserted, and a spool return mounted in the cylinder tube 9b. It comprises a return spring 9c. 10
Is a manifold for a hydraulic line attached to a side surface of the main body 1, and the manifold 10 has a clamp mechanism 3.
And a supply port 11 connected to a hydraulic pressure source for supplying hydraulic pressure to the rotary mechanism 9. The supply port 11 is connected to the cylinder 9 of the rotary mechanism 9 through a spool port 10 a.
b and a throttle port 10 b provided with a throttle valve 12 and a check port 1 provided with a check valve 13.
Oc is connected to a plunger port 10d which communicates with the hydraulic operating chamber 7 of the clamp mechanism 3 via the pressure port 0c. Supply of hydraulic pressure to the hydraulic operating chamber 7 is performed via a check port 10c provided with a check valve 13. The pressure oil is discharged from the hydraulic working chamber 7 through the throttle port 1 provided with the throttle valve 12.
0b. The supply port 11 and a hydraulic hose (not shown) are provided with a one-touch joint 11a which can be attached and detached with one touch. The throttle valve 12 can adjust the amount of throttle by loosening the nut 12a to adjust the position of the valve body, and can adjust the oil discharge speed of the throttle valve 12.

Reference numeral 14 denotes a slide mechanism for moving the clamp arm 4 forward and backward. As shown in FIG. 4, the slide mechanism 14 has a cam plate 14a which is loosely fitted to the angular shaft portion 2b of the rotating shaft 2 and It comprises a pin 15 of the clamp arm 4 which engages with the cam groove 14b of the cam plate 14a, and a floating spring 16 which presses the cam plate 14a against the clamp arm 4 and allows the clamp arm 4 to float. The floating spring 16 is wound around the rotating shaft 2. 1
Reference numerals 7 and 17 denote tension springs having one ends locked to the spring posts 1c and 1c implanted in the main body 1 and the other ends locked to the spring posts 4b and 4b on both sides of the clamp arm 4. This allows the arm 4 to float freely.
Reference numeral 18 denotes a work holding bolt screwed to the lower surface of the distal end portion of the clamp arm 4. The holding bolt 18 has a convex arcuate end and can be adjusted in length according to the height of the work. And 18a is a lock nut for fixing the holding bolt 18, and 19 is a cover for the clamp disc spring 6.

[0008] With the above-mentioned structure, a hydraulic hose (not shown) connected to a hydraulic pressure source via a one-touch joint 11a is connected to the supply port 11 of the manifold 10 by one-touch connection. When the hydraulic pressure is supplied from the hydraulic hose, the supply port 11 of the manifold 10 and the check port 1
0c, the check valve 13, and the plunger port 10d, the pressure oil flows into the hydraulic working chamber 7 formed between the piston of the plunger 5 and the cylinder cylinder 1a, and the plunger 5 descends against the urging force of the clamp disc spring 6. I do. When the lifting of the clamp arm 4 by the plunger 5 is released in this manner, the floating arm 16 maintains the floating state in which the clamp arm 4 is in contact with the lock nut 2a.

Further, by supplying the hydraulic pressure to the supply port 11,
Hydraulic pressure is also supplied from the supply port 11 into the cylinder cylinder 9b of the rotation mechanism 9 through the spool port 10a.
The piston a moves forward in the cylinder cylinder 9b against the urging force of the return spring 9c, and presses the cam portion 2c of the rotating shaft 2 to move the rotating shaft 2 in the direction of arrow a as shown in FIG. Will be rotated. At this time, the flat surface 9d is the receiving surface 2d so that the spool 9a does not bite into the cam portion 2c.
The pressing of the spool 9a is received. The rotation of the rotating shaft 2 causes the cam plate 14a of the slide mechanism 14 to rotate in the counterclockwise direction, and the pin 15 of the clamp arm 4 engaged with the cam groove 14b of the cam plate 14a is moved to the position indicated by the chain line in FIG. The clamp arm 4 slides the slide hole 4a into the rotating shaft 2
And the long groove 4c is retracted by being guided by the pin 8 of the plunger 5.

After the clamp arm 4 is retracted in this way, the workpiece is placed on the worktable and the hydraulic pressure to the hydraulic hose is stopped, and the plunger 5 is raised by the urging force of the clamp disc spring 6. Will be done. At this time, the amount of oil in the hydraulic working chamber 7 is reduced from the plunger port 10d by the throttle valve 12 and discharged to the throttle port 10b, so that the plunger 5 rises slowly. Become. On the other hand, the oil in the cylinder cylinder 9b that has pressurized the piston of the spool 9a of the rotation mechanism 9 is pushed back by the return spring 9c by stopping the hydraulic pressure, and the oil in the cylinder cylinder 9b is released from the spool port 1
Oil is quickly discharged from the supply port 11 through 0a.
Therefore, the spool 9a moves backward earlier than the plunger 5. Simultaneously with the retraction of the spool 9a, the clamp arm 4 advances on the workpiece by the tensile force of the tension springs 17, 17 and the pin 15 also advances, whereby the cam plate 14a is rotated clockwise to prevent rotation. The loosely fitted rotation shaft 2 rotates because the regulation of the spool 9a is removed.

When the holding bolt 18 of the clamp arm 4 reaches the workpiece in this way, the oil pressure in the hydraulic working chamber 7 continues to be slowly discharged by the throttle valve 12, and the plunger 5 is moved by the clamp disc spring 6. The urging force continues to rise slowly, and when the hydraulic pressure is finally removed from the hydraulic working chamber 7, the base end of the clamp arm 4 is pushed up by the pin 8 of the plunger 5 which has been raised by the urging force of the clamp disc spring 6. With this pushing up, the holding bolt 18 of the clamp arm 4 presses the workpiece, thereby clamping the workpiece. After completion of the clamping, the supply port 11
When the workpiece is cut by removing the hydraulic hose (not shown) connected via the one-touch joint 11a from the, the cutting work in which the working table rotates can be performed without any trouble. Also, removal of the workpiece
Similar to the above-described retraction operation of the clamp arm, a hydraulic hose (not shown) is connected to the one-touch joint 11a to supply hydraulic pressure.

[0012]

According to the present invention, as is apparent from the above description, the clamp arm is free to float and slides back and forth when unclamping. Therefore, even when the workpiece has irregularities, the clamp position is limited. Less likely to receive.
Further, by using a one-touch joint, the hydraulic hose can be instantaneously attached and detached from the supply port of the manifold with one touch, so that the present invention can be applied to a clamp such as a lathe or a turning machine when a workpiece is rotated. Moreover, even if the hydraulic hose is attached and detached each time cutting is performed, the work efficiency is rarely reduced. In addition, by using the clamp disc spring for the clamping operation, it is possible not only to prevent the occurrence of a clamping failure due to a hydraulic problem or the like, but also to use the disc spring for the crank to generate a compact and strong clamping force. Therefore, the apparatus can be installed in a narrow space and the apparatus can be miniaturized. In addition, the amount of clamping of the clamp arm (adjustment of the stroke of the plunger) can be easily performed by adjusting the number of combined clamp disc springs. . Further, as in the case where a coil spring is used, high-precision cutting can be performed without generating surging due to vibration or the like during cutting. Also, by providing a throttle valve capable of adjusting the throttle amount in the manifold, there are various advantages such as a change in hydraulic pressure caused by external hydraulic piping, oil temperature, and the like can be easily corrected. Therefore, the present invention is extremely significant in that it contributes to the development of the industry as a clamping device that has solved the conventional problems.

[Brief description of the drawings]

FIG. 1 is a vertical sectional front view showing a preferred embodiment of the present invention.

FIG. 2 is a partially cutaway side view showing a preferred embodiment of the present invention.

FIG. 3 is a plan view showing a preferred embodiment of the present invention.

FIG. 4 is a plan view showing a main part of a slide mechanism according to a preferred embodiment of the present invention.

FIG. 5 is a plan view showing a main part of a rotation mechanism according to a preferred embodiment of the present invention.

FIG. 6 is a longitudinal sectional view of a conventional clamping device.

FIG. 7 is a sectional view taken along line AA of a conventional clamping device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body 1a Cylinder cylinder 2 Rotating shaft 3 Clamp mechanism 4 Clamp arm 4a Slide hole 5 Plunger 6 Clamp disc spring 6a Disc spring 7 Hydraulic operating chamber 9 Rotating mechanism 10 Manifold 11 Supply port 12 Throttle valve 14 Slide mechanism 14a Cam plate 14b Cam groove 15 pin 16 floating spring

Claims (4)

[Claims] 1. A rotating shaft rotated by a rotating mechanism is supported by a main body, and a slide hole of a clamp arm is loosely fitted to the rotating shaft to support the clamp arm in a freely movable manner. A floating spring is provided around the rotating shaft, and a slide mechanism is provided for sliding the clamp arm back and forth by rotation of the rotating shaft. Further, a clamp of the clamp arm for vertically moving the plunger by a clamp disc spring and hydraulic pressure. A clamp device comprising a mechanism provided with a supply port for supplying hydraulic pressure, and a throttle valve for adjusting the amount of throttle provided on a manifold provided with a supply port for supplying hydraulic pressure. 2. The clamping device according to claim 1, wherein the hydraulic hose connected to the supply port is detachable by a one-touch joint. 3. The clamp device according to claim 1, wherein the slide mechanism comprises a cam plate loosely fitted on the rotation shaft and a pin of a clamp arm engaged with a cam groove formed in the cam plate. . 4. A clamp disc spring comprising a combination of a plunger having a clamp mechanism mounted on a cylinder cylinder of a main body, a hydraulic operating chamber for lowering the plunger, and a plurality of disc springs for raising the plunger. Or the clamp device according to 2 or 3.