JPH09277132A - Swivel clamp device - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To enable strong clamping by spring force. A large-diameter first cylinder hole 9 and a small-diameter second cylinder hole 10 are formed in a housing 7 at predetermined intervals in the vertical direction. The annular piston 11 is inserted into the first cylinder hole 9 in a hermetically sealed manner, and the lower portion of the rod 5 of the clamp member 4 is pivotally inserted into the cylindrical hole 11a of the piston 11 in a hermetically sealed manner. Second in the second cylinder hole 10
The piston 12 is inserted in a hermetically sealed state in a state where it is prevented from turning. In the clamped state, the pressure oil in the working chamber 18 is discharged to the outside, and the urging force of the clamp spring 21 urges the clamp member 4 downward via the first piston 11 described above.
When the pressure oil is supplied to the working chamber 18, first, the first piston 11 and the clamp member 4 are moved up against the clamp spring 21, and then the second piston 12 is moved down to move the clamp member. 4 is swiveled along the guide groove 35.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clamp device of a type in which a clamp member is pivoted from a retracted position to an unclamped position and then moved straight to the clamped position.

[0002]

2. Description of the Related Art Generally, a rotary type clamp device of this type drives a clamp member to a clamp position by pressure oil supplied to a clamp working chamber (see, for example, Japanese Utility Model Publication No. 60-18267). ).

[0003]

The above-mentioned prior art is excellent in that it can be strongly clamped by the hydraulic pressure, but the clamping force also disappears when the hydraulic pressure in the clamping working chamber disappears due to pressure oil leakage or the like. There was a point. In order to solve the above-mentioned problems, an object of the present invention is to provide a swivel type clamp device of a type in which a clamp member is clamp-driven by a spring force, and the clamp device can be equipped with a strong clamping spring. Especially.

[0004]

In order to achieve the above-mentioned object, the present invention comprises a turning clamp device as follows, as shown in FIGS. 1 to 4, for example.

(Invention of claim 1) The invention of claim 1 is configured as follows. The clamp member 4, which is supported on the housing 7 so as to be vertically movable and rotatable, is rotated from the retracted position Z to the unclamped position Y by the rotating operation means 27, and then,
The clamp spring 21 is moved straight to the clamp position X, and conversely, the clamp member 4 at the clamp position X is unclamped against the clamp spring 21 by the pressure fluid supplied to the working chamber 18. It is configured to move straight to the position Y and then to be swung to the retracted position Z by the swiveling operation means 27, and the annular piston 11 is inserted into the cylinder hole 9 of the housing 7 in a hermetically sealed state, and The base end portion of the clamp member 4 is rotatably inserted into the cylindrical hole 11a of the piston 11 in a hermetically sealed manner, and the base end portion of the clamp member 4 is transferred from the pressure fluid in the working chamber 18 to the clamp member 4 of the above. The transmission of the acting force to the piston 11 and the transmission of the urging force of the clamp spring 21 from the piston 11 to the clamp member 4. To constitute a part 14 is provided.

(Invention of Claim 2) In the invention of Claim 2, the following configuration is added to the configuration of Claim 1 described above. A swivel operation chamber 26 is formed in series with the working chamber 18 in the housing 7, and the swivel operation means 27 is arranged in the swirl operation chamber 26. Another cylinder hole 10 arranged at a predetermined distance from the cylinder hole 9 in the axial direction, another piston 12 inserted into the other cylinder hole 10 in a hermetically sealed manner, and rotation of the other piston 12. Of the swivel prevention mechanism 32 for preventing the linear movement of the piston 12 and the clamp member 4
The conversion mechanism 33 for converting into the swiveling motion of the above, and another spring 22 for urging the above-mentioned other piston 12 toward the above-mentioned clamp member 4, and by the pressure fluid supplied to the above-mentioned working chamber 18. The other piston 12 is configured to be separated from the clamp member 4 against the another spring 22, and a total area of a pressure receiving area of the annular piston 11 and a pressure receiving area of the clamp member 4 is formed. Was set to a value larger than the pressure receiving area of the other piston 12 described above.

(Invention of Claim 3) In the invention of Claim 3, in the configuration of Claim 2, the pressure fluid is constituted by pressure oil, and the working chamber 18 is constituted by the swivel operation chamber 26.
It is configured to communicate with the pressure oil supply / discharge port 40 via the.

[0008]

[Effects]

(Invention of Claim 1) The invention of Claim 1 has the following operational effects, for example, as shown in FIGS. 1 to 3. When the clamp member 4 is driven from the clamp position X in FIG. 1 to the unclamp position Y in FIG. 2, pressure fluid is supplied to the working chamber 18. Then, the fluid pressure acting on the annular piston 11 causes the clamping spring 21 to contract, and the fluid pressure acting on the clamping member 4 causes the clamping spring 21 to move through the transmission portion 14 and the annular piston 11 in order. Contract. As a result, the clamp member 4 is moved straight from the clamp position X in FIG. 1 to the unclamp position Y in FIG. After that, the clamp member 4 in the unclamp position Y is switched to the retracted position Z in FIG. 3 by the turning operation means 27.

As described above, the clamping spring 21 is
Fluid pressure acting on the annular piston 11 and the clamp member 4
Since it is contracted by a large force due to the resultant force with the fluid pressure acting on, a strong spring can be adopted. Therefore, a large clamping force can be secured in the clamping device. Further, since the urging force of the clamp spring 21 is applied to the clamp member 4 via the piston 11 so that the clamp member 4 is rotatable with respect to the piston 11, the clamp member 4 is pivoted. At the same time, the spring 21 can be prevented from being twisted, and the structure for preventing the twist is simple.

(Invention of Claim 2) The invention of Claim 2 has the following action and effect, for example, as shown in FIGS. 1 to 3. When switching from the clamped state of FIG. 1 to the retracted state of FIG. 3 through the unclamped state of FIG. 2, first, in the clamped state of FIG. 1, medium pressure (for example, 14 kgf /
Supply a pressurized fluid with a pressure of about cm ² to 28 kgf / cm ² .
Then, as shown in the unclamped state of FIG. 2, the pressure fluid supplied to the working chamber 18 acts on the clamp member 4 and the annular piston 11, so that the fluid pressure acting on the pressure receiving area of the clamp member 4 is transmitted. The annular piston 11 is pushed upward via the portion 14, and the fluid pressure acting on the annular pressure receiving area of the annular piston 11 pushes the upward piston 11 upward. As a result, the clamp member 4 is lifted up against the clamp spring 21,
The clamp member 4 is switched to the unclamp position Y.

[0011] Then, supplies pressure fluid of the high pressure (e.g., pressure from 42kgf / cm ² of about 70 kgf / cm ²⁾ of the said working chamber 18. Then, as shown in FIG. 3, another piston 1
2 is lowered straight against the other spring 22 by the turning stroke S. As a result, the clamp member 4 is swung by the conversion mechanism 33 with respect to the other piston 12 which has been swung by the swivel prevention mechanism 32, and the clamp member 4 is switched to the retracted position Z.

Switching from the retracted state shown in FIG. 3 to the clamped state shown in FIG. 1 through the unclamped state shown in FIG.

As described above, since the clamp member 4 can be swung by the pressure fluid supplied to and discharged from the working chamber 18, the dedicated driving mechanism necessary for the swiveling operation means 27 is omitted, and the clamp device can be used. Can be made simply.

(Invention of Claim 3) According to the invention of Claim 3, since the turning operation means 27 can be immersed in the oil, the turning operation means 27 can be sufficiently lubricated and the occurrence of rust can be greatly suppressed. . Therefore, the turning operation means 27 is
It operates smoothly over a long period of time and does not require maintenance.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the clamp device of the present invention will be described below with reference to the drawings. First, the configuration of the clamp device will be described with reference to FIGS. 1, 4, and 5. FIG. 1 is a vertical sectional view of a clamped state. FIG. 4 is a plan view. FIG. 5 is a detailed view of the portion indicated by arrow V in FIG.

A workpiece 2 mounted on the upper surface of the table 1 is fixed by a clamp member 4 of a clamp device 3. The clamp member 4 includes a rod 5 extending vertically.
And an arm 6 fixed to the upper part thereof. A push bolt 6a is fixed to the tip of the arm 6 so that the height can be adjusted. The housing 7 of the clamp device 3 is fixed to the table 1 by four bolts 8.

A large-diameter first cylinder hole 9 and a small-diameter second cylinder hole (another cylinder hole) 10 are provided in the housing 7 substantially coaxially with a predetermined space in the vertical direction. An annular first piston 11 is provided in the first cylinder hole 9 described above.
Is inserted in a hermetically sealed manner. The cylinder bore 1 of the first piston 11
The lower portion (base end portion) of the rod 5 is pivotally inserted into the la 1a in a hermetically sealed manner. The transmission flange of the rod 5
A thrust bearing 15 is mounted between the (transmission part) 14 and the lower surface of the first piston 11 described above. Note that reference numerals 24 and 25 are O-rings for sealing the piston, respectively.

The upper wall 7a of the housing 7 and the first wall
A clamp spring chamber 17 is formed between the piston 11 and the working chamber 18 below the first piston 11. The first piston (clamping spring) 21 mounted in the spring chamber 17 urges the first piston 11 downward, and the ring 19 receives the movement of the first piston 11 by a predetermined amount or more.

At the lower part of the housing 7, a swivel operation chamber 26 is formed in series with the above-mentioned working chamber 18,
A turning operation means 27 is arranged in the turning operation chamber 26.
The turning operation means 27 is configured as follows.

The second cylinder hole 10 is formed in the lower center of the swivel operation chamber 26, and the second cylinder hole 1 is formed.
The second piston (another piston) 12 is inserted in a hermetically sealed state at 0, and the fitting flange 29 projecting upward from the second piston 12 is fitted into the swivel operation chamber 26. The total area of the annular pressure receiving area of the first piston 11 and the pressure receiving area of the rod 5 is the second piston 1 described above.
It is set to a value larger than the pressure receiving area of 2.

The working chamber 18 formed between the fitting flange 29 and the first piston 11 is
It communicates with the pressure oil supply / discharge port 40 through the throttle hole 38 and the swivel operation chamber 26. The above fitting flange 29 is the second
By biasing upward by the spring (another spring) 22, the second piston 12 is biased toward the rod 5.

The ball 30 provided on the outer peripheral portion of the fitting flange 29 is fitted into the groove 31 of the housing 7. The ball 30 and the groove 31 constitute a turning prevention mechanism 32 for the second piston 12. Further, a conversion mechanism 33 for converting the vertical movement of the second piston 12 in the vertical direction into the turning movement of the rod 5 is provided. The conversion mechanism 33 includes a shaft 34 protruding upward from the second piston 12 and the shaft 3 thereof.
4 is formed by a pair of guide grooves 35, 35, and another ball 36 fitted in each guide groove 35 and supported by the rod 5. The shaft 34 is inserted under the rod 5. Further, the guide groove 35 includes a straight line portion 35a and a spiral portion 35b (see FIG. 2).

The clamping spring chamber 17 is communicated with the outer space of the housing 7 by the first breathing passage 41, and the lower space of the second cylinder hole 10 is brought into the outer space of the housing 7 by the second breathing passage 42. Communicated. A check valve 43 is attached to the first breathing path 41. As shown mainly in FIG. 5, the check valve 43 includes a check valve seat 45 and a check valve chamber 46 arranged in series, and a ball-shaped check member 47 inserted in the check valve chamber 46. And its check member 4
Non-return spring 48 for closing and abutting 7 on the non-return valve seat 45
It is constituted by and.

The check valve chamber 46 is constituted by the internal space of the sleeve 50 which is press-fitted and fixed to the housing 7. The sleeve 50 may be screwed and fixed instead of being press-fitted and fixed. The ball-shaped check member 47 may be made of steel, rubber, plastic, or the like. Further, the check member 47 may have a disc shape or a conical shape instead of the ball shape.

Further, the check valve 43 may be a reed type check valve. In this case, the check member is brought into close contact with the check valve seat by its own elastic force. The various check valves described above may be provided in the second breathing path 42.

Next, the operation of the clamp device will be described with reference to FIGS. 1, 2 and 3 above. 2 shows the unclamped state, and FIG. 3 shows the retracted state. In addition,
In FIG. 1 to FIG. 3, the reference symbol A indicates the entire stroke, the reference symbol B indicates the clamp stroke, the reference symbol C indicates the margin stroke, and the reference symbol S indicates the turning stroke.

In the clamped state of FIG. 1, the pressure oil in the working chamber 18 is discharged to the outside through the throttle hole 38, the turning operation chamber 26, and the supply / discharge port 40. As a result, the first spring 21
Presses the first piston 11 downwards,
The piston 11 presses the rod 5 downward via the thrust bearing 15 and the transmission flange 14. As a result, the clamp member 4 is switched to the clamp position X, and the arm 6 fixed to the upper portion of the rod 5 presses the workpiece 2 against the table 1 via the push bolt 6a.

When the clamped state of FIG. 1 is changed to the retracted state of FIG. 3 through the unclamped state of FIG. 2, first, in the clamped state of FIG. In embodiments, 14 kgf / cm ² to 28
Supply pressure oil with a pressure of about kgf / cm ² .

Then, as shown in the unclamped state of FIG. 2, the above pressure oil is supplied from the supply / discharge port 40 to the working chamber 18 through the throttle hole 38, and the oil pressure thereof is applied to the rod 5 and the first piston. It acts on 11 and. Then, the oil pressure acting on the pressure receiving area of the rod 5 pushes the first piston 11 upward through the transmission flange 14 and the thrust bearing 15 in order, and at the same time, the oil pressure acting on the annular pressure receiving area of the first piston 11 is increased. First piston 11 with the same pressure
Push upwards. As a result, the rod 5
The clamp member 4 is switched to the unclamp position Y by being raised against the first spring 21 in accordance with the engagement between the linear portion 35a of the guide groove 35 and the ball 36.

When the pressure in the clamp spring chamber 17 increases when the first piston 11 is raised, the air or the like in the spring chamber 17 pushes the check member 47 open and flows out. .

[0031] Then, (in this embodiment, from 42kgf / cm ² 70kgf / cm ² pressure of about) the high pressure to the sheet discharge port 40 of the supplying pressure oil. By supplying the high-pressure oil to the working chamber 18, the second piston 12 is vertically lowered by the turning stroke S against the second spring 22 as shown in FIG. Then, the rod 5 is swung according to the engagement between the spiral portion 35b of the guide groove 35 and the ball 36, and the clamp member 4 is moved to the retracted position Z with respect to the shaft 34, which is swung by the swivel prevention mechanism 32. Can be switched.

When switching from the retracted state of FIG. 3 to the clamped state of FIG. 1 through the unclamped state of FIG. 2, first, in the retracted state of FIG. 3, the inside of the working chamber 18 is in a high pressure state (from 42 kgf / cm ² 70 kgf / cm ² moderate pressure state from the pressure) of (28 kgf from 14kgf / cm ² / cm ² pressure of about) reduces to.
Then, as shown in the unclamped state of FIG. 2, the second piston 12 is lifted by the turning stroke S (see FIG. 3) by the second spring 22. Then, the clamp member 4 is swung according to the engagement between the spiral portion 35b of the guide groove 35 and the ball 36, and is switched to the unclamp position Y in FIG.

Then, the pressure oil is discharged from the supply / discharge port 40 to switch the inside of the working chamber 18 to the non-pressure state. Then, as shown in FIG. 1, the first spring 21 presses the clamp member 4 downward through the first piston 11, the thrust bearing 15, and the transmission flange 14 in order, and the clamp member 4 is clamped. Switched to position X.

When the first piston 11 descends, the pressure in the clamp spring chamber 17 becomes lower than the atmospheric pressure, but the check member 47 is kept closed and in contact with the check valve seat 45. Therefore, liquid in the outer space of the housing 7, liquid such as cutting oil, gas such as air, and solids such as dust do not enter the clamp spring chamber 17. Therefore, it is possible to prevent corrosion of the cylinder hole 9 and smoothly drive the first piston 11 for a long period of time. The first piston 11
At the time of its descending, since the spring chamber 17 becomes a negative pressure, it receives an upward force due to atmospheric pressure, but is smoothly driven downward by the first spring 21, which is much stronger than the negative pressure.

The above embodiment can be modified as follows. The turning operation means 27 may use a fluid pressure motor or an electric actuator such as a solenoid or an electric motor, instead of the above-mentioned piston actuation type. The fluid supplied to the working chamber 18 is
Instead of the pressure oil, another type of liquid or a gas such as air may be used. The check valve 4 is provided in the first breathing hole 41.
Instead of 3, an air filter or a wire net may be attached.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of a clamp device in a clamped state, showing an embodiment of the present invention.

FIG. 2 is a view showing an unclamped state of the clamp device, and is a view corresponding to FIG. 1 described above.

FIG. 3 is a diagram corresponding to FIG. 1 above, showing a retracted state of the above clamp device.

4 is a plan view of the clamping device of FIG. 1 above.

5 is a detailed view of an arrow V portion in FIG. 1 described above.

[Explanation of symbols]

4 ... Clamping member, 7 ... Housing, 9 ... Cylinder hole
(First cylinder hole), 10 ... another cylinder hole (second cylinder hole), 11 ... annular piston (first piston), 11a
... cylinder hole of piston 11, 12 ... another piston (second piston), 14 ... transmission portion (transmission flange), 18 ... working chamber,
21 ... Clamping spring (first spring), 22 ... Another spring (second spring), 26 ... Revolving operation chamber, 27 ... Revolving operating means, 3
2 ... Turning prevention mechanism, 33 ... Conversion mechanism, 40 ... Supply / discharge port, X
... Clamp position, Y ... Unclamp position, Z ... Retreat position.

Claims (3)

[Claims] 1. A clamp member (4) supported by a housing (7) so as to be vertically movable and pivotable is pivoted from a retracted position (Z) to an unclamped position (Y) by a pivoting operation means (27), and thereafter, The clamp spring (21) moves straight to the clamp position (X), and conversely, the clamp member (4) at the clamp position (X) is moved to the above by the pressure fluid supplied to the working chamber (18). Move straight to the unclamp position (Y) against the clamp spring (21), and then
The retreat position (Z) by the turning operation means (27).
It is configured so that it is swung into the cylinder hole (9) of the housing (7), and an annular piston
(11) is inserted in a hermetically sealed manner, and its piston (11)
The base end portion of the clamp member (4) is rotatably and tightly inserted into the cylindrical hole (11a) of the clamp chamber (11a), and the working chamber (1
The force acting on the clamp member (4) from the pressure fluid of 8) is transmitted to the piston (11), and the urging force of the clamp spring (21) is applied from the piston (11) to the clamp member (4). A transmission unit (14) for transmission is provided,
A swivel type clamp device characterized by the above. 2. The swivel type clamp device according to claim 1, wherein a swivel operation chamber (26) is formed in series communication with the working chamber (18) in the housing (7), and the swivel operation chamber (26) is formed. Control room
Another cylinder in which the turning operation means (27) is arranged in (26), and the turning operation means (27) is arranged at a predetermined interval in the axial direction with respect to the cylinder hole (9). Hole (1
0), another piston (12) inserted into the other cylinder hole (10) in a hermetically sealed manner, a rotation preventing mechanism (32) for preventing the rotation of the other piston (12), A conversion mechanism (33) for converting the rectilinear motion of the other piston (12) into the pivotal motion of the clamp member (4), and the other piston (12) described above is attached to the clamp member (4). And another clamp (22) that biases the other piston (12) against the other spring (22) by the pressure fluid supplied to the working chamber (18). (4), the total area of the pressure-receiving area of the annular piston (11) and the pressure-receiving area of the clamp member (4) is the other piston.
A swivel type clamp device characterized by being set to a value larger than the pressure receiving area of (12). 3. The swivel type clamp device according to claim 2, wherein the pressure fluid is constituted by pressure oil, and the working chamber is formed.
(18) through the swivel operation chamber (26) to supply and discharge the pressure oil
A swivel type clamp device characterized by being configured to communicate with (40).