JPH0424590B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a switching valve device used for clamping and unclamping a workpiece to a jig or the like for machining.

(Prior art) Conventionally, in the case of a rotary-only machine as shown in FIG.
Then, the operator 3 sets the workpiece in the jig 2 and clamps it, and performs different machining operations at each step rotation position from 2st to 7th using a processing device 6 such as a drill or milling cutter installed on the fixed table 4. At position 8 st, the processed workpiece is unclamped from the jig 2 and discharged from the product outlet 7.

Clamping and unclamping of the workpiece with respect to the jig 2 in such a rotary-only machine is performed by operating a lever of a switching valve device 5 provided for each jig 2. That is, after setting the workpiece on the jig at the initial position 1st, operate the lever of the switching valve device 5 to clamp it, and for the jig 2 at the final position 8st, return the lever of the switching valve device 5 to unclamp it. is being carried out.

FIG. 4 is a sectional view showing an example of a conventional switching valve device used in the rotary-only machine shown in FIG. A spool 15 for switching and connecting the tank port 14 is slidably provided, and the spool 15
A switching lever 17 is supported at the tip of the rod 16 extending to the right side of the spool 15, and a latch mechanism 19 having three concave and convex portions is provided at the tip of the rod 18 extending to the other end of the spool 15. A return spring 20 is incorporated to return the spool 15 to the neutral position.

For clamping and unclamping using the switching valve device shown in FIG. Pressure oil is supplied to the clamp cylinder to perform clamping operation, while for unclamping, by tilting the switching operation lever 17 to the left, the spool 15 is moved to the right via the rod 16, and the load port 12 is moved to the tank. It communicates with the port 14 to remove pressure oil from the clamp cylinder and perform an unclamping operation.

(Problem to be Solved by the Invention) However, in the case of such a conventional switching valve device, it was necessary for the operator to operate a lever each time clamping and unclamping. The dedicated machine required the operator to operate the clamp and unclamp levers each time the instructor table rotated, which resulted in a problem that the operator's work hours increased significantly.

Of course, there are rotary valves that automatically clamp and unclamp according to the rotation of the instructor table, but rotary valves have a complicated structure and are expensive, and furthermore, because the valve is large, it is difficult to maintain a small size. Another problem was the inability to use tools.

(Means for Solving the Problems) The present invention has been made in view of the above-mentioned problems in the prior art.In a switching valve device for switching between clamping and unclamping of a jig, etc., the load port is controlled by a switching operation lever. A spool that switches between the pump port and the tank port is slidably provided inside the valve body, and a pusher rod that protrudes outside is brought into contact with one end of the spool, and either the clamp or unclap can be switched by lever operation. At the same time, the other switching can be performed by automatically operating a push rod using a cylinder or a cam.

(Embodiment) FIG. 1 is a sectional view showing an embodiment of the present invention.

First, to explain the configuration, 10 is a valve body, and inside the valve body 10 there are rods 16, 1.
A spool 15 extending from both sides of the spool 15 is slidably provided, and a tank port 14 is connected to a land 15a of the spool 15 in the neutral position shown in the figure.
is open, and pump port 1 is opened in land 15b.
3 is open and forms a load port 12 connected to the clamp cylinder between the lands 15a and 15b. The rods 16 and 18, which are provided integrally with the spool 15, are taken out from both sides of the valve body 10 through plugs 21 and 22 screwed in, and the plugs 21 and 22 have O-rings built into them for sealing against hydraulic pressure. There is. The lower end of a switching lever 17 is supported at the tip of the rod 16 taken out to the right, and the switching lever 17 is rotatably supported on the right valve body 10a with a shaft 23.

Further, a latch mechanism 19 consisting of three concave and convex portions for locking the spool 15 in left, right, and neutral positions is provided on the tip side of the rod 18 taken out to the left side of the spool 15. A return spring 20 is incorporated into the mechanism 19 for returning the spool 15 to the neutral position shown.

In this way, the rod 18 extending to the left side of the spool 15 is housed inside the valve body 10b, and the plug 25 screwed into the end of the valve body 10b is inserted into the rod 18 to form a pusher rod with one end protruding outside. We have set up 24
By pushing the pusher rod 24 from the outside, the spool 15 can be switched and moved in the right direction.

Furthermore, as shown in FIG. 3, the embodiment shown in FIG. 1 uses a switching valve installed in a rotary-only machine as an example, so the switching valve device is attached to the instructor table side that is rotated by steps. A cylinder 26 for pushing a pusher rod 24 of the switching valve device is mounted at a predetermined position on the fixed table 4 provided around the instructor table. This cylinder 26
The installation position is, for example, the final step rotation position 8st in FIG. 3, and the jig into which the bushier rod 24 has been pushed in by the cylinder 26 is unclamped.

Next, the clamping and unclamping operations of a jig in a rotary dedicated machine using the switching valve device shown in the embodiment shown in FIG. 1 will be explained.

First, in the initial position, after setting the workpiece on the jig on the instructor table, by tilting the lever 17 to the right, the spool 15 is moved to the left via the rod 16.
With this switching movement, the pump port 13 passes between the lands 15a and 15b of the spool 15 to the load port 1.
2, and clamps the workpiece by supplying pressure oil to a clamp cylinder (not shown).

On the other hand, a cylinder 26 is provided on the side of the fixed table 4 corresponding to the final step rotation position of the instructor table, facing the pusher rod 24, and every time the step rotation of the instructor table is completed, a pressure oil switching means (not shown) is activated. Pressure oil is supplied to the cylinder 26, and the cylinder 2
Pusher rod 2 moves forward with the piston rod 6.
Push in 4. Due to this pushing of the pusher rod 24, the spool 15, which had been switched to the clamped state, moves to the right, and passes from the neutral position shown in the figure to the tank port 15 via between lands 15a and 15b.
The clamp cylinder is switched to a state where it is communicated with the load port 12, and the pressure oil from the clamp cylinder is drained to the tank port 14 to remove the workpiece, and the state is switched to an unclamped state.

As described above, in the embodiment shown in FIG. 1, the switching operation lever 17 is used to perform either clamping or unclamping. As for the other side, since it is switched by pressing the pusher rod 24 by pressing the cylinder 26, the lever operation by the operator is enough to switch between clamping and unclamping.
This reduces the operator's man-hours by half when used on a rotary-only machine.

FIG. 2 is a sectional view showing another embodiment of the present invention, and this embodiment is characterized in that a hemispherical cam contact portion 27 is integrally formed at the tip of the pusher rod 24 taken out from the valve body 10b. ,
A fixed cam 28 is provided on the side of the fixed table 4, which is the final step rotation position when used in the rotary-only machine shown in FIG. 27 against the fixed cam 28 and push the pusher rod 24,
The spool is switched to unclamp.

In the above embodiment, the spool is switched to clamp by operating the lever, and after this switching, the spool is returned to unclamp by the cylinder or cam, but conversely, the spool is switched to clamp by operating the cylinder. Alternatively, the pusher rod may be pushed in by a cam, and the subsequent switching to unclamping may be performed by operating a lever.

(Effects of the Invention) As explained above, according to the present invention, in a switching valve device for switching between clamping and unclamping of a jig, etc., a spool that switches and connects a pump port and a tank port to a load port by a switching operation lever. is slidably provided inside the valve body, and a pusher rod that protrudes outside is brought into contact with one end of this spool, and switching to either clamping or unclamping is performed by operating a lever, and switching to the other is performed by operating a lever. Since the push-shear rod is pushed in automatically using an external force such as a cylinder or cam, the operator only needs to operate the lever to either clamp or unclamp when used in a rotary-only machine, eliminating the need for conventional clamping and unclamping. The operator's man-hours can be cut in half compared to when both are done by lever operation, and the valve device can be made smaller because it only requires a pusher rod in the conventional lever-operated switching valve device. In addition, the cost can be reduced, and a small jig can be easily designed and manufactured.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing one embodiment of the present invention, Fig. 2 is a sectional view showing another embodiment of the invention, and Fig. 3 is a sectional view showing another embodiment of the invention.
The figure is an explanatory diagram of a rotary-only machine in which a switching valve device is used, and FIG. 4 is a sectional view showing a conventional example. 1: Instructor table, 2: Jig,
3: Operator, 4: Fixed table, 5: Switching valve device, 6: Processing machine, 10, 10a, 10
b: Valve body, 12: Load port, 13: Pump port, 14: Tank port, 15: Spool, 16, 18: Rod, 17: Switching operation lever, 19: Latch mechanism, 20: Return spring, 21, 22, 25 : Plug, 23: Shaft, 2
4: Push shaft rod, 26: Cylinder, 27:
Cam contact part, 28: Fixed cam.

Claims (1)

[Scope of Claims] 1. A switching valve device for switching between clamping and unclamping of a jig, etc., comprising: a spool that is slidably provided inside a valve body and alternately connects and switches a pump port and a tank port to a load port; The movement of the spool is controlled by a switching operation lever supported at the tip of a rod extending from one end of the spool, and a left/right/neutral switching position formed at the tip of the rod extending from the other end of the spool. The spool is provided with a latch mechanism for locking the spool, and a pusher rod whose one end abuts the tip of the rod equipped with the latch mechanism and whose other end protrudes outside, and the spool is switched by operating the switching operation lever and pressing the pusher rod by an external force. A switching valve device characterized by: