JP2818932B2 - Clamping device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clamp device most suitable for fixing a work such as a die attached to a machine tool such as a press machine.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 8, for example, as shown in FIG. 8, a holding body 54 to which a lower mold is detachably fixed to a bolster 51 of a press machine main body 50 and an upper mold 52 is detachably fixed.
Is provided so as to be able to move up and down with respect to the bolster 51.

As means for fixing the upper mold 52 to the holder 54, a pair of stud bolts 55 is horizontally projected forward from the holder 54, and a fixture 56 is slidably attached to the stud bolts 55. Fitted outside. Then, the holding body 54 and the fixture
Generally, the mold 52 is fastened and fixed by the fixture 56 and the holder 54 by inserting the mold 52 between the 56 and fastening the nuts 57 screwed to the stud bolts 55 respectively. is there.

[0004]

However, in the above-mentioned conventional means, the operator has to artificially tighten or loosen the nut 57 with a tool such as a spanner, and the work is troublesome and the work time is shortened. There was a problem of cost.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and has a structure in which a work such as a mold can be automatically fixed and released by a holding body and a fixing tool.
It is an object to improve the work efficiency.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and has a holding member 3 and a holding member 3.
The fixture 6 is movably provided so as to be moved toward and away from the workpiece, and the fixture 6 is moved toward the holder 3 so that the work 2 such as a mold can be fastened and fixed by the fixture 6 and the holder 3. The fixing means comprises a stud bolt 4 fixed in the moving direction of the fixing tool 6.
And a nut body 38 screwed to the stud bolt 4, and a driving means 5 for rotating the nut body 38.

A holder 3 fixed to the press body 1, a fixture 6 movably provided so as to come into contact with and separate from the holder 3, and a mold 2 comprising the fixture 6 and the holder 3. And a fixing means for moving the fixing tool 6 to the holding body 3 so that the fixing screw 6 can be fastened and fixed, the fixing means comprises a fixing screw body 4 fixed to the press machine body 1 side.
And a fixing tool 6 rotatably screwed to the fixing screw body 4.
Consists of a rotating screw body 38 that advances to approach the holding body 3 and a driving unit 5 that rotates the rotating screw body 38.

Further, a plurality of stud bolts 4 are provided in parallel with each other, and these stud bolts 4 are configured to be inserted through the fixture 6.

The driving means 5 has an air motor section 8 and a gear reduction device 10 connected to an output shaft of the air motor section 8. The gear reduction device 10 meshes with the output shaft and rotates. First gear reduction means 24 having a low speed;
A second gear reduction unit 29 disposed at a side of the first gear reduction unit 24 so as to mesh with the first gear reduction unit 24 and rotating at a lower speed than the rotation speed of the first gear reduction unit 24; Preferably, the rotational force is transmitted to the nut body 38.

The driving means 5 includes an air motor 8
And a gear reduction device 10 connected to the output shaft of the air motor unit 8. The gear reduction device 10 meshes with the output shaft and has a low rotation speed, and a first gear reduction unit 24; A second gear reduction means 29 disposed at a side of the first gear reduction means 24 for meshing with the first gear reduction means 24 and rotating at a lower speed than the rotation speed of the first gear reduction means 24;
In order for the gear reduction means 29 to revolve around the output shaft, the second
An internal gear 28 meshed with the gear reduction means 29 is provided, and the revolving force of the first gear reduction means 24 and the second gear reduction means 29 is transmitted to the nut body 38.

[0011]

1 to 7 show an embodiment of the present invention. A case where the fastening device of the present invention is mounted on a press machine will be described. In FIG. 7, reference numeral 1 denotes a press machine main body, and a clamp portion 1a for releasably attaching the mold 2 shown in FIG. 2 is provided above the bolster 1b on the front surface thereof.

As shown in FIG. 1, the clamp portion 1a comprises a pair of stud bolts 4 whose bases are fixed to a vertically movable holder 3 of the press machine main body 1 in a horizontal and forward direction. It has a slidable fixing tool 6 having an insertion hole 6a through which the hole is inserted, and an air clamp mechanism 5.

The holding body 3 is formed with a concave portion 3a having an opening on the front surface and the bottom surface and into which the fixing tool 6 is slidably fitted. The bottom surface (the center of the holding member 3) of the concave portion 3a has A semicircular positioning concave portion 3b having substantially the same diameter as the shaft portion 2a of the mold 2 is formed. At the center of the tip of the fixture 6, the mold 2
A positioning recess 6b having a semicircular shape having substantially the same diameter as the shaft portion 2a is formed, and a distal end of a pressing bolt 7 screwed to the fixing tool 6 protrudes from a peripheral surface thereof.

The air clamp mechanism 5 includes an air motor section 8 and a reduction gear 10 provided in a main body case 9 as shown in FIG.

The air motor section 8 is of a conventionally known type, and a rotor 13 is rotatably inserted into a cylinder 12 having a non-circular inner peripheral surface fixed to the main body case 9. A plurality of vanes 14 are provided on the rotor 13 so as to be radial and extend and retract. Each vane 14 is pressed against the inner peripheral surface of the cylinder 12 by, for example, air, and is compressed by the action of compressed air sucked into a space 14a formed between the cylinder 12 and the rotor 13 from an air suction port (not shown). 13 is rotatable in the forward and reverse directions.

Reference numeral 15 denotes an upper plate, and 16 denotes a lower plate. The upper plate 15, the lower plate 16 and the rotor 13 are screwed and integrated by a plurality of bolts 17 provided in the circumferential direction of the rotor 13. , An output shaft 20 provided integrally at the center of the lower plate 16 and facing downward,
It rotates with it. Reference numeral 18 denotes an upper end cover for closing the upper end of the main body case 9.
It is screwed to the upper end of.

Next, the speed reducer 10 will be described.
Reference numeral 22 denotes a pair of large-diameter first gears that mesh with a gear portion 20a formed on the output shaft 20, and are provided on both sides of the output shaft 20, as shown in FIGS. A shaft portion 23a of a small-diameter second gear 23 is inserted into each first gear 22 so as not to rotate relatively, and the diameter of the pitch circle of the second gear 23 is set smaller than that of the first gear 22. . The first gear 22 and the second gear 23 constitute a first gear reduction means 24.

Numeral 25 denotes a large-diameter third gear meshed with the second gear 23, as shown in FIGS. 5 (a) and 5 (b).
Numeral 25 indicates that the diameter of the pitch circle is set to be larger than that of the first gear 22. The shaft portion 26a of the small-diameter fourth gear 26, which is arranged parallel to the side of the shaft portion 23a of the first gear 22 and parallel to the shaft portion 23a of the first gear 22, is inserted through the third gear 25 so as not to rotate relatively. One diameter of the pitch circle of the fourth gear 26 is set smaller than that of the third gear 25, and as shown in FIG.
Is meshed with an internal gear 28 fixed to the main body case 9. The third gear 25 and the fourth gear 26 constitute a second gear reduction means 29, and the first gear reduction means 24, the second gear reduction means 29 and the internal gear 28 constitute a planetary gear mechanism. I have.

Reference numeral 30 denotes a disk-shaped upper gear case in which the upper end of the shaft 23a of the second gear 23 and the upper end of the shaft 26a of the fourth gear 26 are supported via bearings 31, respectively. Reference numeral 33 denotes a disc-shaped lower gear case in which the lower ends of the shaft 23a of the second gear 23 and the shaft 26a of the fourth gear 26 are supported via bearings 34, respectively. And both upper and lower gear cases 30, 33
Are integrally fastened and fixed by a plurality of gear case fixing bolts 35 to hold the first to fourth gears 22, 23, 25, 26.

A hexagonal hole 37 is provided at the center of the lower gear case 33.
A boss portion 33a is provided as an output take-out means formed with. Numeral 38 denotes a nut body into which a male screw portion 4a at the tip of the stud bolt 4 is screwed. At the center of the nut body, a convex portion 40 having a hexagonal cross section which is fitted into the hexagon hole 37 so as not to rotate relatively is provided. Here, the nut body 38 is inserted into the cutout portion 6c of the pressing body 6 and rotates integrally with the lower gear case 33.

Reference numeral 39 denotes a lower end cover for supporting the nut body 38. The main body case 9 is a press machine main body 1.
And is slidably held by the projection 41 on the side,
Its rotation is blocked.

One embodiment of the present invention is constituted as described above. Next, a case where the mold 2 is attached to and detached from the holder 3 by the clamp device will be described. First, the fixture 6 is retracted, and in this state, the shaft 2a of the mold 2 is inserted between the fixture 6 and the holder 3.

Next, when the compressed air is supplied to the air motor section 8, the rotor 13 rotates and the output shaft 20 rotates at the same time. The rotational force of the output shaft 20 is the first
At this time, the rotation speed of the first gear 22 is reduced as compared with the output shaft 20 because the first gear 22 has a larger diameter than the output shaft 20 as shown in FIG. Is done.

The rotational force of the first gear 22 is transmitted to the third gear 25 via the second gear 23. The third gear 25 has a larger diameter than the second gear 23 as shown in FIG. Therefore, the rotation speed of the third gear 25 is further reduced. Further, as shown in FIG. 6, a fourth gear 26 having a smaller diameter than each third gear 25 is a fixed internal gear.
The fourth gear 26 revolves while rolling on the internal gear 28 because it is meshed with the upper gear 28, and the upper and lower gear cases 30, 33 are rotated at a reduced speed to a predetermined rotation speed.

Since the upper and lower gear cases 30, 33 rotate the nut body 38, the nut body 38 is to screw the fixed stud bolt 4, and at this time, the main body case 9 moves the fixture 6. The fixing tool 6 approaches the holding body 3 while sliding the stud bolt 4, and the fixing tool 6 firmly clamps and fixes the shaft portion 2 a of the mold 2 with the holding body 3 via the fixing bolt 7. This fixing force can be appropriately set according to the pressure of the supplied air.

Next, when the press work is completed or the mold 2 is replaced with a different kind of mold, air is supplied to the air motor section 8 through the other air suction port. To rotate in the opposite direction.
The connection between the mold and the holder 3 is released, and the mold 2 can be removed.

As described above, since the second gear reduction means is arranged on the side of the first gear reduction means, the air clamp mechanism 5 can be enlarged in the axial direction of the output shaft, that is, forward. Therefore, when the operator replaces the mold 2 or the like, there is little possibility that the air clamp mechanism 5 may hinder the work.

Further, the gear reduction device 10 includes a first gear reduction unit that meshes with the output shaft and has a low rotation speed, and a second gear reduction unit that rotates at a lower speed than the rotation speed of the first gear reduction unit. , It is possible to reduce the speed in a plurality of stages, and to increase the reduction ratio.

The present invention is not limited to the above embodiment, and the driving means may be an electric motor.
The gear reduction means can be further provided in three or more stages. The stud bolt 4 may have a male thread 4a formed over its entire length, or may have a nut body at the tip.
The male screw portion 4a may be formed only at the portion where the 38 is screwed. In addition, it is also possible to provide a nut portion on the fixed screw body 4 side and, on the contrary, provide a bolt portion on the rotating screw body 38 side.

[0030]

As described above, the fixing means of the present invention comprises a stud bolt fixed in the moving direction of the fixing tool, a nut body screwed to the stud bolt, and a nut for rotating the nut body. Since a driving means is provided, the work of fastening and releasing a work such as a mold can be automatically performed, and the work efficiency can be improved, which is very convenient.

Further, the driving means includes an air motor section and a gear reduction device connected to an output shaft of the air motor section. The gear reduction device meshes with the output shaft and has a low rotation speed. A first gear reduction means, and a second gear reduction means arranged at a side of the first gear reduction means so as to mesh with the first gear reduction means and rotating at a lower speed than the rotation speed of the first gear reduction means. In the case of a configuration in which the torque of the gear reduction unit is transmitted to the nut body, it is possible to reduce the speed in a plurality of stages, and it is possible to increase the reduction ratio.
In addition, since the second gear reduction unit is arranged on the side of the first gear reduction unit, the size of the output shaft does not increase in the axial direction.

Accordingly, it is possible to reduce the size of the entire clamp device provided with the gear reduction device of the present invention. For example, in the operation of attaching and detaching a mold to and from a press machine, the clamp device can be easily set without disturbing the operation. There are advantages that can be done.

[Brief description of the drawings]

FIG. 1 is a cross-sectional plan view showing an embodiment of a clamp device according to the present invention.

FIG. 2 shows the same clamping device, (a) is a sectional side view,
(B) is a front view.

FIG. 3 is a cross-sectional plan view showing the clamp device.

FIG. 4 is an exploded perspective view of the gear reduction device.

5A is a cross-sectional view taken along line AA of FIG. 3, and FIG.
BB line sectional view of

FIG. 6 is a sectional view taken along line CC of FIG. 3;

FIG. 7 is an overall perspective view.

8A and 8B show a conventional example, wherein FIG. 8A is a cross-sectional plan view, and FIG.

[Explanation of symbols]

1. Press body, 2. Mold (work), 3. Holder,
4 stud bolt (fixed screw body) 5 driving means 6
... Fixing tool, 8 ... Air motor part, 10 ... Gear reduction gear, 20
... output shaft, 24 ... first gear reduction means, 28 ... internal gear, 29 ... second gear reduction means, 33a ... output extraction means, 38 ... nut body (rotating screw body)

Claims (5)

(57) [Claims] 1. A holder (3), a fixture (6) movably provided so as to come into contact with and separate from the holder (3), and a metal member comprising the fixture (6) and the holder (3). In a clamping device comprising a fixing means for moving the fixing tool (6) to the holder (3) side so that a workpiece (2) such as a mold can be fastened and fixed, the fixing means comprises a fixing tool (6). ) And a stud bolt (4) fixed in the moving direction of the stud bolt (4).
1. A clamping device comprising: a nut body (38) screwed into the nut; and a driving means (5) for rotating the nut body (38). 2. A holder (3) fixed to a press machine body (1), a fixture (6) movably provided so as to come into contact with and separate from the holder (3), and the fixture (6). ) And holder (3)
Fixture (6) so that the mold (2) can be fastened and fixed with
And a fixing means for moving the fixing screw to the holding body (3), the fixing means comprising: a fixing screw (4) fixed to the press machine body (1); A rotary screw body (38) rotatably screwed to (4) and having the fixing tool (6) screwed to approach the holding body (3);
And a driving means (5) for rotating said rotary screw body (38). 3. The clamping device according to claim 1, wherein the stud bolts (4) are provided in a plurality and in parallel, and the stud bolts (4) are inserted through the fixture (6). 4. The driving means (5) includes an air motor section (8) and a gear reduction device (10) connected to an output shaft of the air motor portion (8), wherein the gear reduction device (10) is provided.
Is a first gear that meshes with the output shaft and has a low rotation speed.
A gear reduction means (24), a first gear reduction means (2) disposed on a side of the first gear reduction means (24) for meshing with the first gear reduction means (24);
The second gear reduction means (2) that rotates at a lower speed than the rotation speed of (4)
9), and the rotational force of the second gear reduction means (29) is
The clamping device according to claim 1, wherein the clamping device is transmitted to the nut body. 5. The driving means (5) includes an air motor section (8) and a gear reduction device (10) connected to an output shaft of the air motor portion (8), wherein the gear reduction device (10) is provided.
Is a first gear that meshes with the output shaft and has a low rotation speed.
A gear reduction means (24), a first gear reduction means (2) disposed on a side of the first gear reduction means (24) for meshing with the first gear reduction means (24);
The second gear reduction means (2) that rotates at a lower speed than the rotation speed of (4)
9) and an internal gear (28) meshed with the second gear reduction means (29) so that the first gear reduction means (24) and the second gear reduction means (29) revolve around the output shaft. And said 1
The revolving force of the gear reduction means (24) and the second gear reduction means (29) is transmitted to the nut body (38).
The clamp device according to claim 1.