JPS6040335B2 - Rotating clamp device for processing machines - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a rotating clamp for fixing a tool such as a mold or a workpiece to a processing machine (press machine, machine tool, injection molding machine, forging machine, etc.). Regarding the equipment,
The purpose is to reliably link the rotational movement of the clamp claw at the lower end of the working koji and the axial movement without malfunction, and to make the device smaller and lighter so that it can be easily installed in the narrow space of a processing machine. shall be.

For example, in the case of a clamping device for fixing an adapter plate for fixing the upper mold to the inner slide of a double-acting press machine for press working automobile bodies, etc., a swing-type clamping device is used. Since this is not possible, a swiveling and releasable clamping device is used.

The conventional swingable clamp device uses a large stroke hydraulic cylinder to move the rack and the cam at its tip up and down, and the engagement of the cam ring with the cam surface on the operating shaft side causes the operating shaft to rotate. Since the structure is such that the operating shaft is moved up and down by the engagement between the rack and the eccentric spinal cord, the device becomes large and the structure becomes complicated because a large stroke hydraulic cylinder is provided above the device main body.

In the present invention, the operating shaft of the clamp device is linearly driven and swing-driven by two sets of hydraulic cylinders, each piston of these hydraulic cylinders is pressed toward the clamp side by a pressing means, and the linear drive and swing drive are driven. This ensures that the exercise settings are correct.

Hereinafter, embodiments of the first 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 weaving part of the inner slide 1, and this device clamps the adapter plate AP for fixing the upper mold UD to the lower surface of the inner slide 1. It is.

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

The lower end of the operating bag 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.
This structure is such that the machine frame 2 is fixed to the inner slide 1 via the base 5.

As shown below, move the operating shaft 1 to the clamp cylinder 6 at the upper clamp vertical position x 1 and the lower clamp release position x 2.
In addition, the actuating shaft 1 is rotated by the turning cylinder 1 to be able to switch between the clamp claw engaging position YI and the clamp claw disengaging position Y2, 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 a clamping piston 6b is installed therein, and the driving oil chamber 6 for the clamp vertically attached thereto is housed therein.
Coil spring 8 for clamp backup installed in c
The clamping piston 6b is pressed toward the clamping side.

The lower part of the swinging piston 7a of the swinging cylinder 7 has a thin cylindrical shape, and is fitted onto the upper part of the clamping piston 6b, and is also inserted into the cylinder body 7a of the swinging cylinder 7 from the machine frame 2. to form the turning cylinder 7.

The operating shaft 1 includes a clamping piston 6b and a rotating piston 7.
b, and the panel receiving plate 10 is screwed to the upper end thereof. On the outer circumferential side of the swinging piston 7b, a coil spring 9 serving as a pressing means M2 for engaging and driving the clamp claw is clamped between the flange 7c of the piston 7b and the panel receiving plate 10 in a resilient manner, and the operating shaft is 1 toward the vertical clamp side, and at the same time, the pivot 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 cams 11 pivotally supported on the operating shaft 1,
It is fitted into a cam hole 12 formed in the thick-walled cylindrical portion 7b 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, the cam hole 12 is formed in a downward slope from the front leg of the swing piston 7 to the left side, and symmetrically formed in a downward slope from the rear side to the right side. A pair of front and rear cam wheels 11 are fitted into the cam hole 12 so as to freely rotate.

When the cam wheel 11 is at position A in the figure, the operating shaft 1 is in the clamp tightening position XI and the clamp claw engaging attitude YI, and at position C in the figure, the operating shaft 1 is in the clamp releasing position X2 and the clamp claw disengaging 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, the fifth
As shown in the figure, by slidably fitting the key 13 fastened to the machine frame 2 into the vertical groove 14 of the flange 7c of the swing piston 7b, the swing piston 7b itself is prevented from pivoting. shall be kept.

In the end, as mentioned above, the pressing means M for driving the clamp brazing
I is formed by the clamp back-up coil spring 8 and the hydraulic oil in the clamp attachment 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 driving oil chamber 6e is formed on the upper side of b.
By reaching this oil pressure 6e, the clamp claw detachment drive oil chamber 7e
is formed at the bottom of the turning sill 7.

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

FIG. 2 shows that the operating shark 1 is in the clamp tightening position x 1 and in the clamp claw engaging posture YI, and the clamp back-up coil spring 8 is generating a clamping force.

Furthermore, a gap 12 is provided between the cam ring 11 and the spiral cam surface 12a.
b is open, and the actuating shaft 1 is also pressed upward by the coil spring 9 and urged toward the vertical clamp side.

From this state, by supplying pressure oil to the driving oil chamber 6c with clamp cotton, the clamping force can be made even stronger, and the clamping force is normally used in this clamped state.

Next, when the unclamping state is to be achieved, oil is first removed from the clamp tightening drive oil chamber 6c, and then pressure oil is supplied to the clamp release drive oil chamber 6e and the clamp claw detachment drive oil chamber 7e.

When the supplied hydraulic pressure reaches approximately 50k9/lump G, the clamping piston 6b is operated by the clamping stroke towards the clamp release side of the operating shaft 1 against the clamp attachment drive pressing means MI and the pressing means M2, and the clamp is released. piston 6
The stopper 16 of b is locked to the machine frame 2, and the operating shaft 1 is in the clamp release position X2. When oil is further supplied and the oil pressure in the clamp pawl detachment drive oil chamber 7e reaches approximately 80k9/light G, the swing piston 7b operates upward against the clamp pawl engagement drive pressing means M2. , spiral cam surface 12
a rotates the cam wheel 11, and the operating shaft 1 is driven to rotate toward the clamp claw release side.

In this way, by driving the inner slide 1 of the press machine P up and down with the operating shaft 1 in the clamp release position X2 and the clamp claw release position Y2, the clamp claw 3 is engaged with the adapter plate AP for fixing the upper mold. It is inserted into and removed from the matching hole 4.

As mentioned above, the pressure in the clamp release drive oil chamber 7e is higher than the pressure in which the pressure oil in the clamp release drive oil chamber 6e operates the clamp piston 6b toward the clamp release side against the pushing means MI and the push means M2. By setting the pressure so that the oil acts on the clamp claw release side against the pressing means M2 of the swing piston 7b to be higher, it is possible to move the oil after the operating shaft 1 is lowered and switched to the clamp release position X2. , the switching operation shall be sequenced so that the clamp claw is turned to take the clamp claw detachment position Y2.

By setting in this way, both drive oil chambers 6
When discharging the oil from e and 7e, in the reverse order of the above-mentioned operation, first, the turning piston b is pressed downward by the pressing means M2, the actuating shaft 1 is actuated to the clamp claw engaging side, and the clamp After discharging the oil from the oil chamber 7e,
The clamping piston 6c is pressed against the operating shaft 1 by the pressing means MI.
is activated to the clamp cotton side, and the clamp release drive oil chamber 6e
It is designed to discharge oil from the tank.

In other words, the order is such that after switching, the position is raised to the vertical mounting position x 1. In addition, coil spring 9
The upper end may be supported by the machine frame 2, in which case the operating shaft 1 is first lowered against the coil spring 8, and then the swing piston 7b is operated against the coil spring 9. In addition, the reference numeral 16a in FIG. 2 is a restriction provided in the pressure oil supply 8E RO 16, and is for ensuring the above-mentioned operating order by limiting the speed of the pressure oil supply E. Next, a detection switch and the like for detecting the clamp state and fan clamp 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, a fan clamp state detection switch 20, and a floating detection switch 21 are attached.

The detectors 19a and 20a of both the detection switches 19 and 20 are inserted through the holes in the cover plate 17 and face the inside, and as shown in FIG. Whales can be seen at positions separated by an angle of about 90 degrees. Then, attach the top plate 2 to the upper surface of the spring receiving plate 10 at the top of the operating shaft 1 with a bolt 22a.
2 is attached, and on the upper surface of this top plate 22, an operation odor 1 for operating both the detectors 19a and 20a is attached in a shape D offset from the axis D of the operating shaft 1.
Attach 9b and 20b.

In FIG. 7, as shown by the solid line, the clamp state detector 19a of the detection switch 19 is operated only when the operating shaft 1 is in the pushed-up clamp tightening position XI and in the clamp claw engagement posture YI. The detector of the unclamp state detection switch 20 is activated only when the operating shaft 1 is in the depressed clamp release position X2 and the rotated clamp claw release position Y2 as shown by the imaginary line. 28a is formed so as to be activated for detection by operation odor 2Qb.

Note that the detection switch 19 is not limited to the contact type, but may be a non-contact type.

Next, use the large adapter plate AP to
In the case of fixing D, it is necessary to retract the clamp claw 3 of the clamp device C into the escape hole 25 of the inner slide 1 as shown in FIG. 8 without loosening the engagement hole 4.

Furthermore, even in the case of a normal adapter plate AP, if its positioning is incorrect, the clamp claws 3 may collide with the entrances of the respective locking holes and become locked.

Therefore, the machine frame 2 of the clamping device C is attached to the inner slide 1.
The flange of the machine frame 2 is inserted into the lifting guide frame 23, which is disposed on a base 5 fixed to the base 5, and the lower part 23a is fixed to the base 5, so that the upper and lower tanks can move freely. The machine frame 2 is pressed onto the base 5 by the coil spring 24, and when the operating shaft 1 floats due to the floating of the clamp claw 3, the whole machine frame 2 resists the coil spring 24 so that it can float from the base 5. to form.

Then, as shown in Figure 8, when the rock 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.

Incidentally, in the above, the coil spring 8 for clamp back-up can be omitted, and in that case, the pressure oil in the vertical clamp drive oil chamber 6c becomes the pressing means MI for driving the clamp wadding.

Next, another embodiment of the first invention will be described based on FIG. 9.

The mechanism for switching and rotating the operating shaft 1 is formed by double large lead screws.

That is, a cylindrical screw is formed in the cylindrical portion 7d of the swinging piston 7b, and the male threads la circumscribed on the operating shaft 1 by spline competition are threaded into the cylindrical screw 7d in an inner formation. The female screw 26 fixed to the cylindrical screw 7d is engaged with the cylindrical screw 7d to form a screw formation. and,
The cylinder body 27 is interposed so that the male screw la does not move up and down with respect to the machine frame 2. When switching from the illustrated clamp state to the unclamp state, when pressure oil is supplied to the clamp release drive oil chamber 6e and the clamp claw release drive oil chamber 6e, the clamp piston 6b first moves down by the clamp stroke while pushing down the operating shaft 1. Then, the stopper 15 is placed on the machine frame 2.
is locked.

When pressurized oil is further supplied, the pivoting piston 7b spirals against the clamp pawl engagement drive pressing means M2, and the flange 7c hits the female screw 26 and stops.

When the cylindrical screw (7d) is threaded, the cylindrical screw (7d) is rotated at a predetermined angle (01) with respect to the female screw 26.
), and the female screw la and the operating shaft 1 rotate at a predetermined angle (
Turn by a2).

In this way, the operating shaft 1 is at a predetermined angle (81
162) By turning the shell 0 through 90 degrees, the operating shaft 1 is switched from the clamp claw engaging position YI to the clamp claw disengaging position Y2.

When switching to the unclamped state, the operation is opposite to the above. In this way, by using the double large lead screw mechanism, the actuating shaft 1 can be turned greatly with a small vertical stroke of the turning piston 7b. In addition, when increasing the stroke of the turning piston 7b, the turning mechanism is not limited to the double large lead screw mechanism, but may be formed by a screw competing mechanism such as a multi-thread screw.

Hereinafter, an embodiment of the pivotable clamp device CI of the second invention will be described based on FIG. 10.

This clamping device CI biases the actuating shaft 1 toward the crank release side and the clamp claw disengagement side by pressing the clamping piston 6b and the swinging piston 7b by the pressing means MI', M2', and pressurized Only when V is supplied, the clamp can be operated to the clamp attachment position XI and the clamp claw engagement posture YI to perform clamping.

That is, the swiveling and removable clamp claw 3 is fixed to the operating shaft,
The operating shaft 1 is in the clamp claw engagement position YI with the turning cylinder 7.
and clamp claw detachment position Y2, enabling rotational driving, and clamp vertical position X using the clamp cylinder 6.
The piston 7b of the rotating cylinder 7 is pressed toward the clamp claw release side by the coil spring 9 of the clamp claw release drive pressing means M2', and the clamp cylinder 6 is moved to the clamp release position X2. The piston 6b is pressed toward the clamp release side by the coil spring 8 of the clamp descaling drive pressing means MI', and the clamp tightening drive oil chamber 6e' of the clamp cylinder 6 and the clamp claw engagement drive chamber 7e' of the swing cylinder 7 are pressed. Pass through the lotus and drive oil chamber 6e' with clamp cotton.
The pressure oil in the clamp pawl engagement drive chamber 7e' moves the pivoting piston 7b toward the pressing means M2' more than the pressure that causes the clamping piston 6b to move toward the clamp tightening side against the pressing means MI'. The pressure that moves the clamp claw toward the engagement side is set lower, and by discharging the pressure oil from both oil chambers 6e' and 7e', the clamping piston 6b is pressed against the pressing means M.
The pivoting piston 7b is configured to be able to be driven to the clamp release side by the pressing means M2', and the rotating piston 7b is driven to the clamp claw release side by the pressure means M2'. The clamping piston 7b is first operated toward the clamp claw engaging side, and then the clamping piston 6b is operated toward the clamping side.

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

1 The clamp release drive oil chamber and the clamp claw release drive oil chamber are connected through a lotus connection, and the clamp piston operates with lower oil pressure than the swing piston, so when switching to the unclamp state, the operating shaft is in the clamp position. It is lowered by a piston, then rotated by a cylinder for rotation, and
When switching to the clamp state, the operating shaft rotates and then rises.

．． In this way, the rotational operation and the linear operation of the operating shaft can be linked without malfunction, so that clamping and unclamping can be performed reliably.

2 A cam mechanism or a double large lead screw mechanism can be used for the mechanism that switches the operation amount between the clamp claw engagement position and the clamp claw disengagement position using the swing piston. The operating shaft can be turned significantly just by operating the stroke.

As a result, the clamp device, especially its overall height, can be significantly reduced, and it can be easily installed even in narrow spaces. 3. As a pressing means for driving the vertical clamp,
When a coil spring for clamp backup is installed in the drive oil chamber with the clamp cotton of the clamp cylinder, this spring can generate a considerable clamping force even when oil leaks in the vertical drive oil chamber.

4. When the coil spring of the clamp pawl engagement drive pressing means is received by the spring receiving plate of the operating shaft and the operating shaft is pushed up,
By using a structure in which this spring also generates clamping force, safety in the event of hydraulic leakage can be further enhanced.

Further, the second invention has the following effects.

5 The clamp tightening drive oil chamber and the clamp pawl engagement drive oil chamber are connected in a continuous manner, and the swing piston operates with lower oil pressure than the clamp piston, so when switching to the clamp state, the operating shaft rotates. After rising, the operating shaft rotates after descending when switching to the fan clamp state.

In this way, the rotational operation and the linear operation of the operating shaft can be linked without malfunction, so that clamping and fan clamping can be performed reliably.

BRIEF DESCRIPTION OF THE DRAWINGS The drawings show an embodiment of the present invention, and FIG. 1 is a schematic vertical cross-sectional view of the right side of a double-acting press machine, FIGS. 2 to 9 relate to the first invention, and FIG. is a vertical sectional view of the main part, Figure 3 is a side view, Figure 4 is a developed view of the cam hole portion of the swing piston, and Figure 5 is the second
6 is a plan view, FIG. 7 is a perspective view of the vicinity of the detection switch, FIG. 8 is a view corresponding to FIG. 3 in a floating state of the clamp device, and FIG. 9 is a different embodiment. FIG. 10 is a longitudinal sectional front view of the main part of the second invention.

1... Operating shaft, 3... Clamp claw, 6
...... Clamp cylinder (6b... piston,
6c...drive oil chamber with green clamp, 6e...clamp release drive oil chamber) 7...swivel cylinder (7
b... Piston, 7c... Flange, 7e... Clamp detachment drive oil chamber), 8... Coil spring, 9... Coil spring, 10... Panel receiving plate, 11...・Cam ring, 12a...cam surface, 16...feeding port, 16a...aperture, x1...clamp vertical mounting position, X2...clamp release position, Y1...Clamp claw engagement posture, Y2...Clamp claw detachment posture, M1
...Press means for driving clamp tightening, M2...
Pressing means for clamp claw engagement drive, 6e'...... Clamp vertical drive oil chamber, 7e'... Clamp claw engagement drive oil chamber, MI'...... Clamp release drive. Pressing means, M2'... Pressing means for driving the clamp claw to disengage.

Figure 1 Figure 4 Figure 2 Figure 3 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10

Claims (1)

[Scope of Claims] 1. The swingable clamp claw 3 is fixed to the operating shaft 1, and the operating shaft 1 can be rotated by switching between the clamp claw engaging position Y1 and the clamp claw disengaging position Y2 using the swing cylinder 7. At the same time, the clamp cylinder 6 is used to tighten the clamp at position X.
1 and the clamp release position X2, the piston 7b of the rotating cylinder 7 is pressed toward the clamp claw engagement side by the clamp claw engagement drive pressing means M2, and the piston 6b of the clamp cylinder 6 is moved to the clamp claw engagement side. is pressed toward the clamp tightening side by the clamp tightening drive pressing means M1, and the clamp release drive oil chamber 6e of the clamp cylinder 6 and the clamp claw release drive oil chamber 7e of the swing cylinder 7 are connected in communication, and the clamp is released. The pressure oil in the drive oil chamber 6e is used as the clamping piston 6b.
The pressure oil in the clamp pawl detachment drive oil chamber 7e moves the pivoting piston 7b against the clamp pawl engagement drive press means M2, rather than the pressure that causes it to move toward the clamp release side against the clamp tightening drive press means M1. By supplying pressure oil to both oil chambers 6e and 7e, the clamping piston 6b is moved to the clamping release side and the swinging piston 7b is moved to the clamping claw release side. When discharging the pressure oil from the oil chambers 6e and 7e, the clamp claw engagement drive pressing means M2 clamps the pivoting piston 7b. The clamp claw detachment drive oil chamber 7 is activated by first operating the claw engagement side.
After the pressure oil is discharged from e, the clamp tightening drive pressing means M1 operates the clamp piston 6b toward the clamp tightening side, and the pressure oil is discharged from the clamp release drive oil chamber 6e. A rotating clamp device for processing machines featuring: 2. The cam ring 11 pivotally supported on the operating shaft 1 is guided by the spiral cam surface 12a formed on the swinging piston 7b, so that the axial linear motion of the swinging piston 7b is converted into the swinging motion of the operating shaft 1. A swingable clamping device for a processing machine as set forth in claim 1, wherein the clamping device is formed as follows. 3 Clamp tightening drive oil chamber 6c of clamp cylinder 6
2. The pivotable clamp device for a processing machine according to claim 1 or 2, wherein a coil spring 8 is elastically mounted as the pressing means M1 for driving the clamp tightening. 4 Clamp tightening drive oil chamber 6c of clamp cylinder 6
4. The pivotable clamp device for a processing machine according to any one of claims 1 to 3, wherein the pressure oil therein is the pressing means M1 for driving the clamp tightening. 5. The processing machine according to any one of claims 1 to 4, wherein the coil spring 9 mounted on the swing piston 7b of the swing cylinder 7 is a clamp claw engagement drive pressing means M2. swivelable clamp device. 6 Coil spring 9 of clamp claw engagement drive pressing means M2
The pivotable clamp device for a processing machine as set forth in claim 5, in which the pivoting piston 7b is clamped elastically between the flange 7c of the pivoting piston 7b and the panel receiving plate 10 fixed to the operating shaft 1. 7. According to any one of claims 1 to 6, a restriction 16a is formed in the supply/discharge port 16 for pressure oil to the clamp release drive oil chamber 6e and the clamp claw release drive oil chamber 7e. Rotating and removable clamp device for processing machines. 8. The swinging and removable clamp claw 3 is fixed to the operating shaft 1, and the operating shaft 1 is configured to be able to be driven in a swing manner by switching between the clamp claw engaging position Y1 and the clamp claw disengaging position Y2 using the swing cylinder 7.
The clamp cylinder 6 is configured to be linearly driven by switching between the clamp tightening position X1 and the clamp release position X2, and the piston 7b of the swing cylinder 7 is pressed toward the clamp claw detachment side by the clamp claw detachment drive pressing means M2'. , the piston 6b of the clamp cylinder 6 is pushed toward the clamp release side by the clamp release drive pressing means M1', and the clamp tightening drive oil chamber 6e' of the clamp cylinder 6 and the clamp claw engagement drive oil of the swing cylinder 7 are pressed. The pressure oil in the clamp tightening driving oil chamber 6e' is in communication with the chamber 7e', and the pressure of the clamping piston 6b is higher than the pressure that moves the clamp piston 6b toward the clamp tightening side against the clamp release driving pressing means M1'. Engagement drive oil chamber 7
The pressure of the pressure oil 6' that moves the pivoting piston 7b toward the clamp claw engaging side against the clamp claw disengagement drive pressing means M2' is set to be lower, and the pressure is set to be lower than that of the pressure oil 6'. By discharging the pressure oil, the clamping piston 6b is moved to the clamp release side by the pressing means M1' for driving the clamp release, and the pivoting piston 7b is moved to the clamp release side by the pressing means M2 for driving the clamp claw release.
', and by supplying pressure oil to both oil chambers 6e' and 7e', the pivoting piston 7b is first actuated to the clamp claw engagement side with the pressure oil. 1. A swingable clamping device for a processing machine, characterized in that the clamping piston 6b is configured to operate toward the clamping tightening side.