JPS6037137Y2 - Clamp device for molds - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a clamping device for molds used for fixing press molds, die-casting molds, etc. to the bed of processing machines.

Conventionally, this has been done by using the above-mentioned mold fixing means, bolting a pine needle fixing device, or using air, hydraulic cylinders, etc.

However, the former method requires manual work and is difficult to work with, while the latter method loses its fixing function when the fluid pressure disappears in the event of a power outage or hose breakage.

This invention aims to eliminate the above drawbacks, and is a new structure that uses a single cylinder mechanism to fix molds with a single touch, and that always fixes the molds accurately regardless of accidents such as power outages or broken hoses. clamping device.

The gist is that the main parts are a piston body that fits inside the cylinder and a shaft body located in the cylinder axis direction in front of the piston body, and both are connected by a spring body.
The slope of the lower front part of the piston body and the lower surface of the rear end of the shaft body are slidably engaged, and furthermore, the front part of the shaft body has its upper surface slidably abutted on a fulcrum shaft pivoted to the cylinder, and further, the front part of the shaft body The shaft body is always urged upward by the located push-up pin.

Detailed description will be given below with reference to FIGS. 1 to 5 of the drawings. The cylinder 1 has a piston body 2 fitted in a hollow portion on the left side of the figure, and is moved left and right by hydraulic or air fluid pressure in the direction E or F in the figure. to slide.

The piston body 2 includes a member 2B whose annular flange portion is hermetically fitted to the inner wall of the cylinder 1 and slides thereon, and a member 2B.
The member 2A is fitted and fixed into the inner hole of the member 2B to close the opening at the rear end (left side in the figure) of the member 2A. Kana slope angle (
approximately 10 degrees), it descends forward (to the right in the figure).

On the other hand, the shaft 3, which has a rectangular cross section and is slightly long, is located in the right hollow part of the cylinder 1, and its axis is approximately aligned with the cylinder axis 1A, and the internal coil spring 7 connects the member 2A and the rear end of the shaft 3. The ridges 9 and the slope 6 at the lower rear end of the shaft body 3 are connected at intervals, and are slidably in contact with each other.

Note that the relative relationships between the members 2A, 2B and the shaft body 3 are as follows:
4, the member 2A is fitted into the circular inner hole of the member 2B, and the rear part of the shaft body 3, which has a square cross section, is fitted into the hollow part of the member 2A whose lower surface has a slope 6, and whose cross section is square. The member 2A is fitted with a side surface stepped portion 11 at the rear of the shaft body 3 by means of an engagement protrusion 10 that is provided upright on the front end side of the member 2A.

The other shaft 3 extends to the right front end of the cylinder 1 and further engages with a circular fulcrum shaft 4 pivoted perpendicularly to the shaft 3 at a predetermined position in the front upper part of the cylinder 1. The guide surface 12 with a chord-shaped notch in the middle part and the upper surface 1 of the shaft body 3
3 is slidably in contact with the front lower part of the cylinder 1 (fulcrum shafts 4 and 18) at a distance from the fulcrum shaft 4.
The push-up pin 5 provided at a relative position of 0° comes into contact with the lower surface 15 of the shaft body 3, and the push-up pin 5 is urged by the coil spring 14 to constantly push the shaft body 3 upward.

The cylinder 1 is then fixed in position on the bed 19 of the machine by means of mounting bolts 16.

Note that the reference numeral 17 is the mold to be clamped, and the reference numeral 18 is the mold 1.
The clamping edge 7 and the reference numeral 20 are sealing rings.

Further, the relationship between the fulcrum shaft 4 and the push-up pin 5 is such that the distance and spring urging force are determined so that the shaft body 3 is pushed up by the coil spring 14 and the shaft body 3 is always in contact with the guide surface 12. .

In the clamp device described above, when it is attached to the bed 19 as shown by the solid line in FIG. 1, the shaft body 3 is generally parallel to the cylinder axis IA, and maintains the above-mentioned relative relationship with the piston body 2, the fulcrum shaft 4, etc.

Then, when clamping the mold 17, when fluid pressure is supplied to the rear surface of the piston body 2 and pressurized in the direction E in the figure, the shaft body 3
The shaft maintains the above-mentioned parallel state due to the compression reaction force of the coil spring 7 and the contact resistance between the slope 6 and the shaft ridge 9 and moves forward as shown by the dotted line in the figure, and the shaft end comes into contact with the mold side and the shaft body 3
When the movement stops, the coil spring 7 is compressed and the ridge 9 at the rear of the shaft moves up the slope 6.

Then, the tip of the shaft body 3 moves in the Y2 direction in FIG. 5, and completely fixes the clamping edge 18 with a strong pressing force.

That is, the rise of the slope 6 of the ridge 9 constitutes a mechanistic boosting mechanism, and an amplified component force in the Y1 direction shown in the figure is generated by the fluid pressure E at the contact point between the ridge 9 and the slope 6, and the component force can be freely applied. It takes a lever configuration with the rotating fulcrum shaft 4 as a fulcrum, and generates a powerful force in the Y22 direction at the front end 8 of the shaft body, and the shaft body 3 creates an intersection angle θ approximately equal to the inclination angle of the slope 6 between the cylinder axes IA. It has exactly the same lamp effect as described above.

Furthermore, another important effect of the present invention is that when the boosting mechanism is actuated by fluid pressure and presses the clamping edge 18,
Even if the fluid pressure in the direction E in the figure disappears, the clamping action by the booster mechanism is maintained normally and is automatically locked.

That is, due to the reaction force of the push-up component Y1 shown in the figure, the piston body 2 generates a strong pressing force in the circumferential direction, and the cylinder 1
On the other hand, the axial component force that causes the piston body to retreat is clearly a small value.

Therefore, the piston body is stopped and held in the clamped position.

In addition, when the clamp is released, fluid pressure is supplied to F in the figure, the piston body 2 retreats, and the shaft body 3 engages with the protrusion 10 of the member 2A and returns to its original position.

As described above, the clamping device according to the present invention accurately fixes the molds by one-touch operation of the single cylinder mechanism, making the installation and replacement work of the molds extremely efficient.

An even more important advantage is that even if fluid pressure is interrupted or disappears due to a power outage, or fluid pressure is lost due to a fluid hose breakage or fluid leak, the clamping action remains locked and normally maintained. Power outage 1, work accidents due to loss of clamping function due to hose damage, etc.
This has the useful effect of completely eliminating defects that cause product defects.

[Brief explanation of the drawing]

Figure 1.2 A front sectional view showing an embodiment of the present invention; Figure 2:
AA sectional view of Fig. 1, Fig. 3: A cross-sectional view of main parts showing the relationship between the piston body and the shaft body, Fig. 4: A partial plan view of Fig. 1 showing the relationship between the piston body and the shaft body, Fig. 5 Figure: An explanatory diagram of the working state of the embodiment in FIG. 1. Main symbols: 1 cylinder - 2: piston body, 3: shaft body,
4: Fulcrum shaft, 5: Push-up pin, 6: Slope, ? , 14: coil spring, 12: guide surface, 16: mounting bolt, 17: mold, 18: edge for clamp, 19: machine bed.

Claims (1)

[Scope of utility model registration request] It consists of a piston body that fits inside the rear part of the cylinder, and a shaft body that resides in the front hollow part of the cylinder and is connected to the piston body via a spring body, and the piston body has a slope that gently descends in the forward direction on the front lower surface. The lower surface of the rear end of the shaft is slidably in contact with the slope, and the front upper surface of the shaft is slidable on a fulcrum shaft pivoted on the cylinder in a direction orthogonal to the shaft. 2. A clamping device for molds, characterized in that the shaft body is biased in the direction of the fulcrum axis by a push-up pin provided below the cylinder.