JPS6023069Y2 - Retractable clamp device for processing machinery - Google Patents

Description

[Detailed description of the invention] The present invention relates to a rotating clamp device for processing machines (press machines, machine tools, injection molding machines, forging machines, etc.), and when the clamp claw hits an obstacle, the clamp device The purpose is to allow the whole to escape and retreat, and to prevent damage.

For example, in the case of a rotating clamp device for fixing the upper mold to the inner slide of a double-acting press machine, the clamp claw is attached to the adapter plate because the conventional clamp device is strongly fixed to the inner slide. There has been a problem in that it hits the entrance of the engagement hole and is not inserted and is damaged.

Furthermore, the clamp claws become a hindrance when fixing a large adapter plate to the outer slide by other means.

In the present invention, the machine frame of the clamp device is supported on the base via an elevating guide device so that it can be guided up and down, and the machine frame is pressed against the base with a spring. When the clamp device is struck and blocked, the entire clamp device floats up from the base against the spring.

Hereinafter, embodiments of the present invention will be described based on the drawings.

Fig. 1 shows a double-acting press machine P, in which a clamping device C is attached to the side end of the inner slide I, and this device attaches an adapter plate AP for fixing the upper mold (4) to the lower surface of the inner slide I. It is meant to be clamped.

The overall structure of this pivotable clamp device C is shown in FIGS. 2 and 3.

The lower end of the operating shaft 1 of the clamp device C extends below the machine frame 2, and a pivoting/detachable clamp claw 3 is attached thereto, and this clamp claw 3 is attached to the adapter plate A for fixing the press die.
is arranged in the engaging hole 4 of the machine frame 2 via the base 5.
The structure is such that it is fixed to the inner slide ■.

As shown below, the operating shaft 1 is moved to the upper clamping position X1 and the lower clamping release position X2 using the clamping cylinder 6.
In addition, the actuating shaft 1 is configured to be able to be switched between the clamp claw retaining position Y1 and the clamp claw detaching position Y2 by rotating the operating shaft 1 with the turning cylinder 7, and the adapter plate A is clamped as necessary. Also, it can be unclamped.

Here, the cylinder body 6a of the clamping cylinder 6 is formed at the lower part of the machine frame 2, and the clamping piston 6b is formed therein.
The clamp piston 6b is urged toward the clamp tightening side by a clamp backup coil spring 8 installed in the clamp tightening drive oil chamber 6c.

The lower part of the swinging piston 7a of the swinging cylinder 7 has a thin cylindrical shape, and is fitted externally onto the upper part of the clamping piston 6b, and is also fitted internally into the cylinder body 7a of the swinging cylinder 7, which is cut out from the machine frame 2. Then, the turning cylinder 7 is formed.

The operating shaft 1 includes a clamping piston 6b and a rotating piston 7.
b, and the spring receiving plate 10 is screwed onto it.

At the outer peripheral end of the turning piston 7b, the piston 7b
A coil spring 9 serving as a pressing means M2 for clamp pawl retention drive is clamped between the flange 7c and the spring receiving plate 10 to urge the operating shaft 1 toward the clamp tightening side, and also for turning The piston 7b is urged downward, that is, toward the clamp claw engagement side.

In the above, the mechanism for turning the operating shaft 1 via the turning cylinder 7 is as follows.

That is, a pair of front and rear cam wheels 11 pivotally supported on the operating shaft 1,
It is inserted into a cam hole 12 formed in the thick-walled cylindrical portion 7d at the top of the turning piston 7, and the operating shaft 1 is turned by the guiding action of the helical cam surface 12a of the cam hole 12.

As shown in the exploded view of FIG. 4, this cam hole 12 is formed in a downwardly inclined shape from the front side to the left side of the turning piston 7, and symmetrically formed in a downwardly inclined form from the rear side to the right side, A pair of front and rear cam wheels 11 are inserted into this cam hole 12.
is fitted so that it can rotate freely.

When the cam wheel 11 is in position A in the figure, the operating shaft 1 is in the clamp tightening position X1 and the clamp claw retaining attitude Y1, and in the C position in the figure, the operating shaft 1 is in the clamp releasing position X2 and the clamp claw releasing attitude Y2.

The moving distance of the operating shaft 1 between AB corresponds to a clamp stroke, and the operating shaft 1 is configured to rotate 90 degrees between BC.

However, in the above case, as shown in FIG. It is assumed that the piston 7b itself is prevented from turning.

After all, as mentioned above, the pressing means M for driving the clamp tightening
1 is formed by the clamp backup coil spring 8 and the hydraulic oil in the clamp tightening driving oil chamber 6c, and the clamp engagement driving pressing means M2 is formed by the coil spring 9.

And the clamping piston 6 of the clamping cylinder 6
A clamp release drive oil chamber 6e is formed above b, and a clamp claw release drive oil chamber 7e is formed in the lower part of the swing cylinder 7 in communication with this oil chamber 6e.

1 Here, the operation of the clamp device C will be explained.

FIG. 2 shows that the operating shaft 1 is in the clamp tightening position X1 and the clamp claw retaining posture Y1, and the clamp backup coil spring 8 is generating a clamping force.

Further, the actuating shaft 1 is also pressed upward by the coil spring 9 through the gap 12b between the cam ring 11 and the cam surface 12a, and is urged toward the clamp tightening side.

Sometimes, by supplying pressure oil to the clamp tightening driving oil chamber 6c, the clamping force can be made even stronger, and the clamping force is usually used in such a ramp state.

Next, when unclamping the state, first drain the oil from the clamp tightening drive oil chamber 6c, and then supply pressure oil to the clamp release drive oil chamber 6e and the clamp claw release drive oil chamber 7e. is about 50kg/aI! G, the operating shaft 1 is operated by the clamping piston 6b by the clamping stroke toward the clamping release side against the clamping driving pressing means M1 and the pressing means M2, and the stopper 15 of the clamping piston 6b is moved. is locked to the machine frame 2, and the operating shaft 1 is at the clamp release position X2.

Furthermore, when pressure oil is supplied and the oil pressure in the clamp claw detachment drive oil chamber 7e reaches approximately 80 ko/aftG, the swing piston 7
b operates upward against the clamp claw retaining drive pressing means M2, the spiral cam surface 12a rotates the cam ring 11, and the operating shaft 1. is driven to rotate toward the clamp claw detachment side.

In this way, by driving the inner slide (■) of the press machine P up and down with the operating shaft 1 in the clamp release position It is inserted into and removed from the engagement hole 4.

As mentioned above, the pressure oil in the clamp release driving oil chamber 6e is higher than the pressure that moves the clamp piston 6b toward the clamp release side against the pressing means M1 and the pressing means M2. By setting the pressure that causes the pivoting piston 7b to move toward the clamp claw release side against the pressing means M2 to be higher, after the operating shaft 1 is lowered and switched to the clamp release position X2, It is assumed that the switching operations are ordered so that the clamp claw is turned into the clamp claw release position Y2.

By setting in this way, the circumferential drive oil chamber 6
When discharging the pressure oil from e and 7e, in the reverse order of operation, the pivoting piston 7b is first pressed downward by the pressing means M2, and the operating shaft 1 is actuated to engage the clamp claw, and the clamp claw is disengaged. After draining the pressure oil from the drive oil chamber 7e,
The clamping piston 6b is pressed against the operating shaft 1 by the pressing means M1.
operates to the clamp tightening side, and the clamp release drive oil chamber 6e
It is designed to discharge pressure oil from.

In other words, the sequence is such that the operating shaft 1 is rotated and switched to the clamp claw retaining position Y1, and then ascends to the clamp tightening position X1.

In addition, the reference numeral 16a in FIG. 2 is a throttle provided at the pressure oil supply/discharge port 16, and is for ensuring the above-mentioned operating order by limiting the speed of pressure oil supply/discharge.

Next, a detection switch and the like for detecting the clamped state and unclamped state of the clamp device C will be explained.

Switch mounting plate 1 erected on cover plate 17 at the upper end of machine frame 2
8, a clamp state detection switch 19, an unclamp state detection switch 20, and a floating detection switch 21 are attached.

The detectors 19a and 20a of the rain detection switch 19.20 are inserted into the hole of the cover plate 17 and face the inside, and as shown in FIG. They are arranged at positions separated by an angle of about 90 degrees.

Then, a top plate 22 is attached to the upper surface of the spring receiving plate 10 at the top of the operating shaft 1 with bolts 22a, and the detectors 19a and 20a for operating the detectors 19a and 20a are attached to the upper surface of the top plate 22 eccentrically from the axis of the operating shaft 1. Operating tools 19b and 20b are attached.

In FIG. 7, as shown by the solid line, only when the operating shaft 1 is in the pushed-up clamp tightening position X1 and the clamp claw engagement posture Y1, the detector 19a of the clamp state detection switch 19 At the same time, the operating shaft 1 is pushed down at the clamp release position X2 and the clamp claw detached position Y2 is rotated as shown by the imaginary line.
The detector 20a of the unclamp state detection switch 20 is activated by the operating tool 20b only when the unclamp state detection switch 20 is present.

Note that the detection switches 19 and 20 are not limited to contact type, but may be non-contact type.

Next, use the large adapter plate AP to
When D is to be fixed, the clamp claw 3 of the clamp device C needs to be retracted into the relief hole 25 of the inner slide I as shown in FIG. 8 without being fitted into the engagement hole 4.

Furthermore, even in the case of a normal adapter plate AP, the clamp claw 3 may collide with the entrance of the retaining hole 4 and become locked if the adapter plate AP is improperly positioned.

Therefore, the machine frame 2 of the clamp device C is arranged on the base 5 fixed to the inner slide I, and the lifting guide frame 23 with its lower part 23a fixed to the base 5 is attached vertically to the flange of the machine frame 2. The machine frame 2 is slidably inserted therethrough and is pressed onto the base 5 by a coil spring 24 mounted on the lifting guide frame 23, and when the operating shaft 1 floats up due to the floating of the clamp claw 3, the machine frame 2
The entire structure is formed so that it can float above the base 5 against the coil spring 24.

Then, as shown in Figure 8, when the machine frame 2 rises slightly,
The levitation detection switch 21 fixed to the top of the machine frame 2 also levitates relative to the lift guide frame 23, and the operating tool 21b at the upper end of the lift guide frame 23 separates from the detector 21a, and the levitation detection switch 21 is activated. .

Thereby, the floating of the machine frame 2 can be reliably detected.

Since the present invention is configured as described above, it has the following effects.

If the clamp claw hits the engagement hole of the adapter plate and cannot be inserted, or if the clamp claw cannot be inserted into the engagement hole when using a large adapter plate, the entire clamp device can be moved through the lifting guide frame. It floats up from the base against the spring and escapes, preventing damage due to collisions and providing excellent durability.

In addition, when the above-mentioned levitation state is detected by a levitation detection switch as in the embodiment, presence or absence of levitation can be reliably detected with a simple device.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a schematic longitudinal sectional front view of a double-acting press machine, FIG. 2 is a vertical sectional view of the main part, FIG. 3 is a side view, and FIG. A developed view of the cam hole part, Fig. 5 is an enlarged view of the v part in Fig. 2, Fig. 6 is a plan view, Fig. 7
The figure is a perspective view of essential parts around the detection switch, and FIG. 8 is a view corresponding to FIG. 3 in a floating state. 1... Operating axis, 2... Machine frame, 3...
... Clamp claw, 5 ... Base, 6 ...
・Clamp cylinder, 7... Swivel cylinder, 21... Levitation detection switch, 21a...
...detector, 21b... operating tool, 23...
... Lifting guide frame, 24... Spring, Xl...
... Clamp tightening position, x2 ... Clamp release position, Yl ... Clamp claw retention posture, Y2 ...
... Clamp claw release position.

Claims (1)

[Scope of utility model registration request] A swiveling and removable clamp claw 3 is fixed to the lower end of the operating shaft 1, and the operating shaft 1 is held in the clamp claw holding position Y by the swing cylinder 7.
1 and the clamp claw disengagement position Y2, and the clamp cylinder 6 is configured to be able to be driven vertically by switching between the clamp tightening position X1 and the clamp release position X2. 7 and the clamp cylinder 6 are supported by the machine frame 2, and the machine frame 2 is placed on the base 5 so as to be able to move up and down with the guide frame 23.
The rotating clamp device for a processing machine is characterized in that the lower part of the machine frame 2 is fixed to the base 5, and the machine frame 2 is pressed and fixed to the base 5 by a spring 24 received on the upper part of the spring 24.