JPH0890103A - Clamp rod twist type clamping device - Google Patents

Abstract

PURPOSE: To provide a clamp rod twist type clamping device which is advantageous to a manufacture cost, by which the structures of twist mechanism, rotary control mechanism, etc., can be simplified and the number of parts used can be reduced. CONSTITUTION: After driving back and forth a clamp rod 20 with a clamp output part 21 pressing and fixing a metallic die 2 by a double action type air cylinder 30 and after making the clamp rod 20 exist a a projection limit position, the clamp rod 20 is driven with a clamp by driving a hydraulic cylinder 40. In the projection limit position of the clamp rod 20, the clamp rod 20 is made to twist by a twist mechanism 50 with a cam hole 51 formed in the clamp rod 20 and a cam pin 52 held by a holding body 53, and a piston 32 is set so that it is not rotated to a cylinder main body by a rotary control mechanism constituted of the double action type air cylinder 30 which is eccentric to the clamp rod 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clamp rod which is driven to move back and forth in the axial direction, at a limit position of advance of about 90 degrees around the axis.
The present invention relates to a clamp rod twist type clamp device of a type for twisting.

[0002]

2. Description of the Related Art Conventionally, in an automobile manufacturing plant or the like, a die for fixing a die to an inner ram in a press machine for forming a large plate-like work having an inner ram and an outer ram surrounding an outer peripheral portion thereof. The clamp device is preferably as small as possible because it is arranged in a narrow space. As a clamp device applicable to fix this type of mold, a clamp of a type that conventionally twists a clamp rod that is driven to move back and forth in the axial direction about 90 degrees around the axis at the end of advancement and the beginning of retreat. The rod twist type clamp device, or the clamp rod at the advance limit position about 90
A clamp rod twist type clamp device of a type that allows a twist is in practical use.

For example, in Japanese Unexamined Patent Publication No. 1-210131, a clamp body, a clamp rod, a fluid pressure cylinder that clamps and drives the clamp rod, and a piston-shaped intermediate portion located below the piston of the fluid pressure cylinder. A member, a sprocket or a fluid cylinder for urging the intermediate member, a rotation restricting mechanism for restricting the rotation of the intermediate member, a compression spring interposed between the clamp rod and the intermediate member, and a clamp rod. A clamp rod twist type clamp device is described which includes a large lead screw mechanism provided at a connecting portion with an intermediate member and includes a twist mechanism for twisting a clamp rod by 90 degrees around its axis. As the rotation restricting mechanism, a key system in which the key portion of the intermediate member is engaged with the key groove, and the key is extended from the intermediate member 2
Various mechanisms have been proposed, such as a rod system in which a rod of a book is inserted into a clamp body, and a non-circular cross-sectional system in which an intermediate member has a non-circular cross section such as an ellipse.

In this clamp device, when the clamp is driven, the intermediate member and the piston of the hydraulic cylinder are moved forward through the spring, and when the intermediate member approaches the piston while the spring contracts at the limit position of the advance, the piston is moved. And the intermediate member, the twist mechanism acts to twist the clamp rod by 90 degrees, and thereafter the clamp rod is clamped by the hydraulic cylinder. When the clamp is released, the hydraulic cylinder is released, when the clamp rod is at the advance limit position, when the spring extends and the intermediate member moves away from the piston, the twist mechanism acts and the clamp rod moves in the opposite direction. A 90 degree twisting operation is performed, and then the clamp rod retracts and moves through the movement of the intermediate member.

[0005]

In the clamp device disclosed in the above publication, the twist mechanism is composed of the male screw portion having a large lead angle and the female screw portion screwed to the male screw portion. There is a problem that the structure of the mechanism is complicated and the manufacturing cost is high. Furthermore, as a rotation restriction mechanism,
Various structures have been proposed, but the key type rotation restricting mechanism cannot be applied from the viewpoint of fluid pressure sealing property when the intermediate member is the piston of the fluid pressure cylinder, and
In the rod-type rotation restricting mechanism, since the rods largely protrude to the outside of the clamp body, the device becomes large, and
The non-circular cross-section type rotation restricting mechanism is disadvantageous in terms of manufacturing the intermediate member and its clamp body. An object of the present invention is to provide a clamp rod twist type clamp device that can simplify the structure of the twist mechanism and the structure of the rotation restricting mechanism.

[0006]

A clamp rod twist type clamp device according to a first aspect of the present invention is a clamp rod twist type clamp device of a type for twisting a clamp rod driven forward and backward in an axial direction by about 90 degrees about an axis. A double-acting rod having a clamp output portion having a substantially T-shaped clamp output portion in a side view at a tip portion thereof, and a piston connected to a base end portion of the clamp rod, and capable of driving the clamp rod forward and backward by a predetermined stroke. Type air cylinder, a rotation restricting mechanism for restricting the piston from rotating around its axis, a restricting portion fixedly provided in the clamp rod in a brim shape, and a double-acting air cylinder. The clamp rod is slidably inserted and has a piston member capable of abutting against the regulation portion, and the clamp rod that has advanced to the maximum is used as a piston member. It is interposed between the piston and the clamp rod, and a clamp hydraulic cylinder that can be clamp-driven in the retracting direction through contact with the control portion, and elastically biases the clamp rod in the advancing direction with respect to the piston. A spring member, a cam hole of a predetermined length in the axial direction formed in one of the piston or the cam member fixed to the piston and the clamp rod, and the cam hole fixed to the other of the piston and the clamp rod. And a twist mechanism having an engaged cam pin and twisting the clamp rod with respect to the piston by 90 degrees when the restricting portion and the piston move relative to each other in the axial direction.

In the twist mechanism, the piston moves relative to the restricting portion through contraction or extension of the spring member when the restricting portion is in contact with the piston member and the clamp rod is at the advance limit position. Occasionally, the clamp rod may be arranged to be twisted (claim 2 dependent on claim 1). The cam hole may be formed in a pin hole shape that is twisted by 90 degrees from the upper end to the lower end (claim 3 depending on claim 1 or claim 2).

The hydraulic cylinder may be configured such that the piston member is clamp-driven by the hydraulic pressure supplied to the hydraulic working chamber, and is returned and driven by the pressurized air supplied to the air operating chamber. Claim 4) which is dependent on any one of claims 1 to 3. The rotation restricting mechanism may be configured such that a double-acting air cylinder is eccentric with respect to the clamp rod and the hydraulic cylinder for clamping (claims 1 to 4). 5).

[0009]

In the clamp rod twist type clamp device according to the first aspect of the present invention, when the object to be clamped is clamped, the double acting air cylinder is driven and the clamp rod is driven to advance, and the restricting portion is a spring. Since the piston is urged upwards against the piston, the clamp rod moves forward with the piston and the restriction part separated, and when the restriction part comes into contact with the piston member of the hydraulic cylinder, the clamp rod moves to the advance limit position. Become. Further, when the piston moves against the spring, the piston relatively approaches the regulating portion, and the rotation of the piston is regulated by the rotation regulating mechanism. Twisted 90 degrees, and the clamp output part of the clamp rod can be locked to the object to be clamped. Therefore, when the hydraulic cylinder drives the clamp rod to retract, the clamp output section clamps the object to be clamped.

When releasing the clamped state, the hydraulic cylinder is unclamped, the clamp rod is returned to the advance limit position, and then the double-acting air cylinder drives the clamp rod to retract or retract. Is in the advance limit position, and when the spring expands and the piston of the air cylinder separates from the restricting portion, the twist mechanism twists the clamp rod about 90 degrees in the opposite direction to the direction described above to clamp the clamp rod. It is driven in and out without being locked by the object.

According to this clamp device, the twist mechanism includes a piston or a cam member fixed to the piston,
Since the cam hole is formed in one of the clamp rod and the cam pin fixed to the piston and the other of the clamp rod and engaged with the cam hole, the cam hole also has a relatively simple structure. The structure of the twist mechanism is simplified and can be manufactured at low cost. Moreover, when the clamp rod is under no load, the double-acting air cylinder drives the clamp rod, and the hydraulic cylinder drives only when the clamp rod is clamp driven. Therefore, the structure of the clamp device can be made economical.

In the clamp rod twist type clamp device according to a second aspect of the present invention, in the twist mechanism, when the restricting portion is in contact with the piston member and the clamp rod is at the advance limit position, the piston is contracted or extended by the spring member. Is configured to move relative to the restricting portion to twist the clamp rod, so that the clamp rod twists at the extension limit position of the clamp rod, and the clamp output portion engages with the object to be clamped. The mating engagement state is established. Also, when the clamp is released, the clamp rod is twisted in the opposite direction at the advance limit position so that the clamp output portion does not engage with the object to be clamped and then retracts. Therefore, since the stroke of the clamp rod for twisting is not necessary, the stroke of the air cylinder can be reduced and the size can be reduced.

In the clamp rod twist type clamp device of the third aspect, since the cam hole is formed in a pin hole shape which is twisted by 90 degrees from the upper end to the lower end, the twist mechanism has a simple and small structure. can do. In the clamp rod twist type clamp device according to claim 4, the hydraulic cylinder has its piston member,
The clamp is driven by the hydraulic pressure supplied to the hydraulic working chamber, and the return operation is performed by the pressurized air supplied to the air working chamber, so that the air working chamber and the air working chamber of the air cylinder are made common. it can.

In the clamp rod twist type clamp device of the fifth aspect, since the rotation restricting mechanism has a structure in which a plurality of air cylinders are eccentric with respect to the clamp rod, the structure of the rotation restricting mechanism is simplified. be able to.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. This embodiment is an example in which the present invention is applied to a clamp rod twist type clamp device for fixing the die 2 (object to be clamped) of the press machine to the base 3. As shown in FIGS. 1 to 3, a clamp rod twist type clamp device 1 (hereinafter, abbreviated as a clamp device).
Is the clamp body 10, the clamp rod 20, the twist mechanism 50 that twists the clamp rod 20 about 90 degrees around the axis at the advance limit position of the clamp rod 20, and the piston 32 of the double-acting air cylinder 30 rotates. The rotation restricting mechanism 60 restricts the movement so as not to move, and the detection unit 70 that detects the advance limit position and the retract limit position of the clamp rod 20.

First, the clamp body 10 will be described. The clamp body 10 is fixed to the base plate 3 by a bolt or the like (not shown). The clamp body 10 has a double-acting air cylinder 30 for driving the clamp rod 20 forward and backward by a predetermined stroke in the axial direction. It is composed of a clamp driving hydraulic cylinder 40 and the like for driving the clamp rod 20 that has been driven to advance to the downward direction. The cylinder body of the hydraulic cylinder 40 includes an upper body 11 as a cylinder body and a lower end of the upper body 11. It is composed of a middle stage main body 13 fixed to the portion by a plurality of bolts 14. The cylinder body of the air cylinder 30 is the middle stage body 13
Lower body 1 fixed with six bolts 15 at the lower end of
2 and a bottom lid 16 for closing the lower end of the lower body 12 and the like.

Next, the clamp rod 20 will be described. A clamp output portion 21 having a substantially oval shape in a plan view and a substantially T shape in a side view is integrally formed on an upper end portion of the clamp rod 20, and the clamp rod 20 includes a hydraulic cylinder 40.
And extends through the shaft hole of the piston member 42, and the lower end portion (base end portion) of the clamp rod 20 is formed to have a small diameter.
A collar-shaped restricting member 22 is screwed and fixed to the small-diameter upper end portion. The restricting member 22 is for restricting the advance limit position of the clamp rod 20, and the restricting member 22 is biased upward by the compression spring 24 with respect to the piston 32. The restriction member 22
Since the bearing 23 is attached to the upper end surface of the
In the contact state with the piston member 42, the restriction member 22 is rotatably contacted with the piston member 42 via the bearing 23. A twist mechanism 50, which will be described later, is provided at the connecting portion between the base end portion of the clamp rod 20 and the piston 32, and the lower end portion of the clamp rod 20 is connected to the piston 32 of the air cylinder 30 via the twist mechanism 50. ing.

The state shown by the solid line in FIG. 1 shows the state in which the clamp rod 20 is retracted to the retracted limit position. In this state, the clamp rod 20 outputs its clamp output as shown by the solid line in FIG. Part 21 is a U-shaped notch 2 of the mold 2
It is in a non-engaged posture capable of passing through a. Air supply port 33
When pressurized air is supplied to the air working chamber 31a from the clamp rod 20, the clamp rod 20 is driven to advance to the advance limit position by the stroke H1 in FIG. 1, and at the advance limit position, the clamp rod 20 is twisted. The clamp rod 20 is twisted 90 degrees around the axis by the mechanism 50, and the clamp rod 20 has its clamp output portion 2 as shown by the chain line in FIG.
1 is orthogonal to the U-shaped notch 2a of the mold 2 and is in an engaging posture capable of engaging with the mold 2.

Next, the double-acting air cylinder 30 will be described. The double-acting air cylinder 30 includes a lower body 12
A cylinder body composed of a bottom cover 16 and a piston 32
And an air drive chamber 31a provided below the piston 32 for advancing drive, an air drive chamber 31b provided at the upper side of the piston 32 for retreat drive, and pressurized air supplied to the air actuation chamber 31a. An air supply port 33 for supplying air, an air supply port 34 for supplying air to the air working chamber 31b, and an air passage 35 for supplying pressurized air from the air supply port 34 to the air working chamber 31b. The air cylinder 30 is configured to drive the clamp rod 20 forward and backward by a predetermined stroke. And, in the state of use,
The air supply ports 33 and 34 are connected to a pressurized air supply source.

Next, the hydraulic cylinder 40 will be described. The hydraulic cylinder 40 includes a cylinder body including an upper body 11 and a middle body 13, and a piston member 4 that is substantially sleeve-shaped and has a clamp rod 20 slidably inserted therein.
2 and a piston member 42 that can abut on the upper surface of the regulating member 22 via a bearing 23;
Clamp driving hydraulic working chamber 41a formed on the upper side of the piston portion of No. 2, a hydraulic pressure supply port 43 for supplying hydraulic pressure to the hydraulic working chamber 41a, and an oil passage communicating this hydraulic supply port 43 with the hydraulic working chamber 41a. It is composed of 44 and the like.
In the use state, the hydraulic pressure supply port 43 is connected to the hydraulic pressure supply source.

When the hydraulic pressure is supplied from the hydraulic pressure supply port 43 to the hydraulic pressure working chamber 41a with the clamp rod 20 in the advanced limit position and the engaging posture by the air cylinder 30, the piston member 42 is in contact with the piston 32. Clamp drive downward together with the restriction member 22,
The clamp output portion 21 of the clamp rod 20 comes into contact with the upper surface of the mold 2 to press and fix the mold 2 to the base 3. Since the hydraulic cylinder 40 is for driving the clamp rod 20 in a clamp manner, the piston member 42 is
It has a very small moving stroke and is configured as a small hydraulic cylinder with a small length. When releasing the clamped state, when the pressurized air is supplied to the air working chamber 31b while discharging the hydraulic pressure in the hydraulic working chamber 41a, the clamp rod 20 has advanced to the advance limit position in the engaged posture. It is in the release state.

Next, the twist mechanism 50 will be described. As shown in FIGS. 4 and 5, the twist mechanism 50 includes a cam hole 51 formed in the base end portion of the clamp rod 20,
The cam pin 52 is engaged with the cam holes 51, and a holding body 53 (cam member) for rotatably holding the cam pin 52 is provided. The holding body 53 is fixed to the piston 32. The cam hole 51 is formed in the base end portion of the clamp rod 20 in the shape of a pin hole that is twisted by 90 degrees from the upper end to the lower end.
Engages and guides the cam hole 51 so as to twist the clamp rod 20 by 90 degrees. Both ends of the cam pin 52 are rotatably held by a holding body 53. The holding body 53 is formed in a cup shape, and the holding body 53 has
The base end of the clamp rod 20 is slidably fitted inside.

The holding member 53 has a piston 32 at the base end thereof.
And is fixed by bolts 55. A restriction pin 56 is attached to the holding body 53 so as to restrict the rotation of the holding body 53 with respect to the piston 32. On the upper part of the holding body 53,
A pair of pin holes 53a are formed facing each other, and a cam pin 52 is rotatably held in the pair of pin holes 53a. At both ends of the cam pin 52, the retaining ring 5
2a is attached.

In the twist mechanism 50 shown in FIG. 4, the regulating member 22 is biased upward by the spring 24 against the piston 32, and the cam pin 52 is engaged with the lowermost end of the cam hole 51. In this state, the piston 32 moves up and down integrally with the clamp rod 20 via the compression spring 24, and the cam hole 51 is not guided by the cam pin 52, so that the clamp rod 20 is not twisted. The twist mechanism 50 of FIG. 5 shows a state where the clamp rod 20 is twisted 90 degrees from the state of FIG. The restriction member 22 is the bearing 23.
When it comes into contact with the piston member 42 which is in an upwardly immovable state via the spring, the spring 24 contracts and the holding member 5
3 relatively moves in the direction of approaching the regulation member 22. Therefore, the cam hole 51 is guided by the cam pin 52,
The cam pin 52 engages with the upper end of the cam hole 51, and the clamp rod 20 is twisted 90 degrees.

Next, the rotation restricting mechanism 60 will be described. The rotation restricting mechanism 60 is for restricting (prohibiting) the rotation of the piston 32 with respect to the cylinder body 12 of the double-acting air cylinder 30. That is, when the piston 32 rotates, the twist mechanism 50 does not operate normally.
The rotation restricting mechanism 60 is required. This rotation restricting mechanism 60
6 and 7, the air cylinder 30 having a piston 32 having a circular cross section is eccentric from the axial center of the clamp rod 20 and the hydraulic cylinder 40 by an eccentric amount e. .

Next, the detector 70 will be described. The detection unit 70 is for detecting the advancing limit position and the retreating limit position of the clamp rod 20, and includes a first reed switch 71 vertically arranged at a predetermined interval on the outer peripheral portion of the lower body 12. It is composed of a second reed switch 72 and a ring-shaped permanent magnet 73 mounted on the outer peripheral portion of the piston 32. When the clamp rod 20 is at the advance limit position, the piston 32 is at the upper limit position in the lower body 12 as shown in FIG. 2, and the permanent magnet 73 on the outer peripheral portion of the piston 32 is the first reed switch 71. To be detected. Further, when the clamp rod 20 is at the retracted limit position, the piston 32 is at the lower limit position in the lower body 12 as shown in FIG. 1, and the permanent magnet 73 on the outer peripheral portion of the piston 32 causes the second lead to move. It is detected by the switch 72. This makes it clear whether the clamp rod 20 is in the advance limit position or the retract limit position.

In FIG. 1, reference numeral 81 is an upper inner peripheral portion of the upper main body 11 of the clamp main body 10 and the piston member 4.
2, a dust seal disposed on the inner peripheral portion of the upper portion, reference numeral 82 is a slide ring disposed on the outer peripheral portion of the piston 32, reference numeral 83 is a ring packing disposed on the outer peripheral portion of the piston 32, and reference numeral 84 is a piston member. A sealing O-ring disposed on the outer peripheral portion of 42, a reference numeral 85 is a sealing O-ring disposed on the outer peripheral portion of the middle stage main body 13, and a reference numeral 86 is disposed on the inner peripheral portion of the middle stage body 13. An O-ring for sealing, reference numeral 87 is an O-ring for sealing disposed on the upper outer peripheral portion of the bottom lid 60.
It's a ring.

Next, the operation of the clamp device 1 will be described with reference to FIG. In a state where the mold 2 (object to be clamped) is placed on the base 3, when the clamp rod 20 is at the retreat limit position, first, pressurized air is supplied from the air supply port 33 of the bottom cover 60 into the air working chamber 31a. (FIG. 12 (a)). Then the piston 3
2 is driven upward, the clamp rod 20 connected to the piston 32 is integrally advanced with the piston 32, and the clamp rod 20 is advanced to the advance limit position where the clamp rod 20 contacts the piston member 42 ((in FIG. 12). b)).

Further, when the pressurized air is continuously supplied, the piston 3 is pressed against the restricting member 22 which is restricted from moving upward.
2 is moved upward, and the clamp rod 20 is twisted about 90 degrees around the axis by the twist mechanism 50, and the clamp output portion 21 of the clamp rod 20 is orthogonal to the U-shaped notch 2a of the mold 2 The engagement posture is set so that the mold 2 can be engaged ((c) of FIG. 12). The piston 32 is
Since the rotation restricting mechanism 60 restricts the rotation of the lower main body 12, which is the cylinder main body, only the clamp rod 20 rotates without the piston 32 rotating.

Next, while supplying the pressurized air, the hydraulic pressure is supplied from the hydraulic pressure supply port 43, the hydraulic pressure is supplied to the hydraulic pressure working chamber 41b through the oil passage 44, and the piston member 42 is driven downward to clamp The rod 20 is a piston member 42,
Clamping is performed integrally with the piston 32 downward, and the clamp output part 21 of the clamp rod 20 abuts the upper surface of the mold 2 to press and fix the mold 2 to the base 3 to be in a clamped state (FIG. 12). (D)).

Next, when releasing the clamped state at the time of exchanging the mold 2, when the hydraulic pressure of the hydraulic pressure operating chamber 41b is discharged while the pressurized air is supplied to the air operating chamber 31a, the pressure is increased. Clamp rod 20 moves piston 3 by air
2 and the piston member 42 are integrally driven upward, and the clamp rod 20 is advanced to the advance limit position in the engaged posture and is in the unclamped state ((e) in FIG. 12). Next, when pressurized air is supplied from the air supply port 34 in a state in which pressurized air is supplied to the air operated chamber 31a, the air operated chamber 31b communicated with the air operated chamber 31b.
Pressurized air is supplied to the restricting member 22, and only the piston 32 is driven downward at a low speed.
At the 0 advance limit position, the twist mechanism 50 twists the clamp rod 20 by 90 degrees in the opposite direction to the above-described direction to the non-engagement posture, without being locked by the mold 2. Entry / exit driving becomes possible ((f) of FIG. 12). When the pressurized air in the air working chamber 31a is discharged while the clamp rod 20 can be driven to retract, the piston 32 is driven downward by the pressurized air in the air working chamber 31b, and the clamp rod 20 is also driven to retract. (Fig. 1
2 (g), (h)).

In the clamp device 1 described above,
Since the clamp rod 20 is twisted 90 degrees at the advance limit position, the required stroke of the air cylinder 30 is generated.
The air cylinder 30 can be miniaturized in the axial direction by reducing the torque. The twist mechanism 50 includes a cam hole 51 formed in the clamp rod 20, a holding body 53 fixed to the piston 32, and a cam pin 52 engaged with the cam hole 51 and supported by the holding body 53. Since the structure is simple, the twist mechanism 50 can be easily manufactured, which is advantageous in manufacturing cost. Moreover, the rotation restricting mechanism 60
Has a structure in which the double-acting air cylinder is eccentric with respect to the clamp rod 20 and the hydraulic cylinder 40, so the structure is remarkably simplified, no special space is required, and the manufacturing is easy. Is advantageous.

Since the double-acting air cylinder 30 drives the clamp rod 20 when the clamp rod 20 is in an unloaded state, and the hydraulic cylinder 40 drives only when the clamp rod 20 is clamp-driven,
The quick operability of the clamp device 1 can be secured, and the structure of the clamp device 1 can be made economical. Further, the hydraulic cylinder 40 has the piston member 42 connected to the hydraulic working chamber 4
The hydraulic cylinder 4 is configured so that the hydraulic cylinder 4 is clamp-driven by the hydraulic pressure supplied to the hydraulic cylinder 1a and is driven by the pressurized air supplied to the return air working chamber 31b of the air cylinder 30.
The structure of 0 has been simplified.

Since the piston member 42 is formed into a substantially sleeve shape, the piston member 42 is used to clamp the clamp rod 20.
It has excellent guideability. In addition, the regulation member 2
Since the bearing 23 is provided on the upper end surface of 2, the clamp rod 20 can be smoothly twisted. In addition, the first and second reed switches 71 and 72 for confirming the position of the clamp rod, which are arranged on the outer peripheral portion of the lower main body 12 of the clamp main body 10, and the permanent magnet 73 arranged on the outer peripheral portion of the piston 32. Since the detection unit 70 is provided, the advance limit position and the retract limit position of the clamp rod 20 can be detected, and the advance and retract operation of the clamp rod 20 can be accurately performed.

As shown in FIG. 8, the mold 2 is provided with an oval hole 2b having an oval shape in plan view slightly larger than the clamp output part 21 in plan view oval shape of the clamp rod 20. 21 may move up and down through the elongated hole 2b in a non-engaging posture shown by a solid line, and may engage and clamp the mold 2 in an engaging posture shown by a chain line. Further, in this embodiment, the clamp rod 20 is provided with the regulating member 22.
Is fixedly mounted, the clamp rod 20 may be integrally formed with a restriction portion instead of the restriction member 22.

Regarding the twist mechanism, in this embodiment, a cam hole 51 is formed in the clamp rod 20, and a cam pin 52 is formed.
Is configured to be rotatably held by the holding body 53,
As shown in FIG. 10, the cam pin 5 is attached to the clamp rod 20.
2 is rotatably held, and the cup-shaped holding body 53
A pair of cam holes 51 may be formed. Furthermore, regarding the modification of the twist mechanism of the above-described embodiment, as shown in FIG. 11, the holding member 53 is provided so that the spring 25 biases the base end portion of the clamp rod 20 upward with respect to the holding member 53.
It may be provided in the hole 53b. A ball 27 and a ball receiving member 26 are provided between the clamp rod 20 and the spring 25 so that the clamp rod 20 can be easily twisted 90 degrees.

In the present embodiment, the case where the object to be clamped is the lower die 2 of the molding machine has been described as an example, but the clamp device 1 of the present invention is the same as the above embodiment except that the object is clamped. Since it can also be used as a device, it can be applied as a device that fixes the upper mold of the molding machine, and also as a device that fixes not only the mold but other various mechanical devices and machine parts. can do.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a clamp rod twist type clamp device according to an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view of the clamp device (clamp rod advance limit state).

FIG. 3 is a vertical sectional view of the clamp device (in a clamped state).

FIG. 4 is an enlarged cross-sectional view of a twist mechanism of the clamp device (clamp rod non-engaging posture state).

FIG. 5 is an enlarged cross-sectional view of a twist mechanism of the clamp device (engagement posture state of the clamp rod).

6 is a sectional view taken along line VI-VI of FIG.

FIG. 7 is a bottom view of the clamp device.

FIG. 8 is a plan view of a clamp output part of the clamp device and a main part of a mold.

FIG. 9 is a plan view of a clamp output part and a main part of a mold of a clamp device according to a modified example.

FIG. 10 is a partial cross-sectional view of a twist mechanism of a clamp device according to a modification.

FIG. 11 is a partial cross-sectional view of a twist mechanism of a clamp device according to a modified example.

12 (a) to 12 (h) are operation explanatory views for sequentially explaining the operation when the clamp device is clamped and then released.

[Explanation of symbols]

 1 Clamp Rod Twist Type Clamping Device 2 Mold (Clamping Object) 10 Clamp Main Body 20 Clamp Rod 21 Clamp Output Part 22 Restricting Member 24 Spring 30 Double-acting Air Cylinder 31a Air Working Chamber 31b Air Working Chamber 32 Piston 40 Hydraulic Pressure for Clamping Cylinder 41a Hydraulic working chamber 42 Piston member 50 Twist mechanism 51 Cam hole 52 Cam pin 53 Holding body (cam member) 60 Rotation restriction mechanism

Claims (5)

[Claims] 1. A clamp rod twist type clamp device of a type in which a clamp rod that is driven to move back and forth in an axial direction is twisted about 90 degrees around an axis, and a clamp having a T-shaped clamp output portion in a side view at a tip end portion thereof. A double-acting air cylinder having a rod and a piston connected to the proximal end of the clamp rod, and capable of driving the clamp rod forward and backward by a predetermined stroke in the axial direction; and the piston not rotating about its axis. And a regulation member fixedly provided in the clamp rod in a brim shape, and a piston member slidably inserted through the clamp rod and abutting against the regulation unit. And a clamp hydraulic cylinder capable of driving the clamp rod that has advanced to the maximum extent in the retracting direction through the contact between the piston member and the restricting portion, A spring member that is interposed between the piston of the dynamic air cylinder and the clamp rod, and elastically biases the clamp rod in the advancing direction with respect to the piston; the piston or a cam member fixed to the piston; and a clamp. It has a cam hole formed on one side of the rod and having a predetermined length in the axial direction, and a cam pin fixed to the other of the piston and the clamp rod and engaged with the cam hole. A clamp rod twist type clamp device comprising: a twist mechanism for twisting the clamp rod by 90 degrees with respect to the piston during relative movement. 2. The twist mechanism, when the piston moves relative to the restricting portion through contraction or extension of the spring member in a state where the restricting portion contacts the piston member and the clamp rod is at the advance limit position. The clamp rod twist type clamp device according to claim 1, wherein the clamp rod is configured to twist the clamp rod. 3. The clamp rod twist type clamp device according to claim 1, wherein the cam hole is formed in a pin hole shape which is twisted by 90 degrees from the upper end to the lower end. . 4. The hydraulic cylinder includes a piston member,
3. The clamp rod twist type clamp device according to claim 2, wherein the clamp rod is twisted by hydraulic pressure supplied to the hydraulic working chamber, and is returned by pressurized air supplied to the air operating chamber. . 5. The rotation restricting mechanism comprises a double-acting air cylinder eccentric to a clamp rod and a hydraulic cylinder for clamping.
The clamp rod twist type clamp device according to claim 4.