JPS5924430Y2 - Work clamp device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a device for clamping a workpiece to a jig, etc. using its hole. To provide a compact lamp device that can accurately clamp even a workpiece with a small hole pitch.

An embodiment of the present invention will be described below with reference to the drawings.

1 is a hydraulic cylinder mounted upward on the bottom surface of jig 2;
Reference numeral 3 denotes a piston rod, and a stopper 5 having an outer circumferential portion 4 tapered and tapered on the cylinder side is attached to the tip of the piston rod by pressing it against a stepped portion of the piston rod 3 with a spherical washer 6.

Reference numeral 7 denotes a clamp bar, which is fitted into the piston rod 3 and cylinder body 20 of the hydraulic cylinder 1 on the same axis as the piston rod 3 so as to be able to move forward and backward, and has a flange 9 having a slightly smaller diameter than the piston 8 at the end on the cylinder side. is provided so as to protrude and engage with the upper end surface of the cylinder chamber, and an axial notch groove 10 is cut in the outer circumferential portion of the distal end side, and a sleeve 11 that can be expanded in diameter is inserted and installed. Through holes 13 are bored at appropriate intervals in the annular portion 12 between the sleeve 11 and the stopper 5 at right angles to the cylinder axis, and a steel ball 14 is inserted into the hole. The pad 5 is engaged.

In the figure, 15 is a cap for closing the upper end of the clamp bar 7 and preventing the snub 11 from being removed, 16 is a locking screw for the snub 11, and 17 is a stopper placed at an appropriate position on the jig 2. It becomes the machining reference surface of the workpiece.

Since this embodiment has the above-described configuration, the hole 19 of the workpiece 18 is inserted into the clamp bar 7 protruding from the jig 2, the workpiece is placed on the stopper piece 17 on the jig 2, and then the switching valve (not shown) is inserted into the hole 19 of the workpiece 18. When pressure oil is supplied to the rod side of the hydraulic clamp 1 and the head side is connected to the tank, the piston 8 is pushed downward, and the clamp bar 7 is pushed upward, so that a flange 9 is formed on the upper end surface of the cylinder. to engage and stop.

Therefore, the steel ball 14 is pushed outward by the descending stopper 5 to expand the diameter of the sleeve 11 and bring the expanded diameter portion of the sleeve into pressure contact with the inner peripheral surface of the hole 19 of the workpiece 18.

Therefore, the piston rod 3 and the clamp bar 7 are
, the steel ball 14, the sleeve 11, and the workpiece 18 are integrated to firmly grip the workpiece 18, and the piston 8
The workpiece 18 is clamped to the stopper piece 17 by the thrust based on the difference in the pressure receiving area of the collar portion 9.

This clamp can be released by supplying pressure oil to the head side of the cylinder 1 and connecting the rod side to the tank.

That is, as the piston rod 3 rises, the stopper 5 and the sleeve 1
1 is larger than the diameter of the steel ball 14, the force for pressing the workpiece becomes zero, the diameter of the sleeve 11 is reduced, and the clamp is released.

As explained above, in the present invention, the work is gripped by the hole and clamped onto the jig by the forward motion of one hydraulic cylinder, so compared to the conventional device using two-stage cylinders, Maintenance and operation are easy, and operating and control equipment such as solenoid valves can be simplified. Also, the piston rod and clamp bar are concentric, minimizing the cross section of the clamp mechanism, making it compact and inexpensive, making it suitable for lamp equipment. It can be done.

Therefore, they can be installed in parallel even in a relatively narrow space, and are suitable for clamping workpieces with small hole pitches, such as multi-cylinder cylinders of motorcycles.

[Brief explanation of drawings]

The drawing is a longitudinal sectional view showing an embodiment of the present invention. 1...Hydraulic cylinder, 2...Jig, 3
・・・・・・Piston rod, 5・・・・・・Ball,
7... Clamp bar 8... Piston,
9... Flange, 10... Notch groove, 11
... Sleeve, 14 ... Steel ball, 17.
...Guessing piece, 18...Work, 19...
····hole.

Claims (1)

[Scope of utility model registration request] It has a double rod configuration consisting of the piston rod of the hydraulic cylinder and a clamp bar that fits into the piston rod and cylinder body on the same axis so that they can move forward and backward, and the outside circumference of the tip side of the clamp bar has an enlarged diameter. possible sleeve,
Further, a stopper whose outer circumference is tapered and the cylinder side is tapered is attached to the tip side of the piston rod, and the tapered surface of the stopper and the inner circumference of the sleeve are fitted into the clamp bar. engaged through a steel ball,
The work clamp device is further characterized in that a flange portion having a diameter smaller than that of the piston protrudes from the end portion of the clamp bar on the cylinder side.