JP2003300124A - Clamp device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a small clamp device. <P>SOLUTION: A plug portion 21 is projected from a clamp pallet 1, and an annular intermediate member 23 enlarged and reduced in a diameter direction is supported by the plug portion 21 movably upwards and downwards. A tapered face 28 of the intermediate member 23 is engaged with a positioning hole 12 of a work pallet 2, and the intermediate member 23 is energized upwards by a coned disc spring 24. A transmission member 31 is inserted in the plug portion 21, and a slide cylinder 38 is inserted in the transmission member 31. A first ball-shaped shut-off member 58 is installed to the slide cylinder 38, and a second ball-shaped shut-off member 68 is installed to a pull rod 13 of the work pallet 2. The transmission member 31 is driven downwards by a clamp spring 19, so that the transmission member 31 pulls a locked part 13b of the pull rod 13 downwards via an engaging tool 34. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clamp device and is used, for example, to fix a work pallet to a clamp pallet placed on a table of a machine tool.

[0002]

2. Description of the Related Art There is a clamp device of this type configured as follows. For example, Japanese Patent Laid-Open No. 2000-3462
As shown in Japanese Patent No. 61, a plurality of clamps for fixing a clamp pallet and a work pallet are provided, and at least one fluid coupler is arranged outside these clamps, and the fluid coupler couples the above clamps. The flow path in the pallet is connected to the flow path in the work pallet.

[0003]

The above-mentioned prior art has a problem that the whole clamp device becomes large in size because a plurality of clamps and at least one fluid coupler are required. An object of the present invention is to provide a compact clamp device.

[0004]

In order to achieve the above object, the invention of claim 1 is, for example, as shown in FIGS.
As shown in FIGS. 5 and 6, the clamp device was configured as follows. A second block 2 such as a work pallet is detachably fixed to a first block 1 such as a table or a clamp pallet, and a positioning hole 12 opened in the second block 2 is inserted into the positioning hole 12. As described above, the plug portion 21 protruding from the first block 1 and the intermediate member 23 that is interposed in the annular space between the plug portion 21 and the positioning hole 12 and is expandable and contractible in the diametrical direction. The intermediate member 23 is supported by one of the plug portion 21 and the positioning hole 12 so as to be movable in the axial direction within a predetermined range and the other 12 (12). 21) so as to be able to taper-engage, and the intermediate member 23 is urged by the elastic member 24 in a direction to make the taper-engagement tight, and the transmission member 3 is attached to the plug portion 21. 1 is inserted, and the transmission member 31 is configured to be movable in the attachment / detachment direction by the drive means D, and the first portion for pressure fluid is provided radially inward of the transmission member 31 to the first block 1 side. 1 joint 5
1 is provided, a second joint 52 for pressure fluid is provided inward of the positioning hole 12 in the radial direction on the side of the second block 2, and the first joint 51 and the second joint 52 are hermetically sealed. By connecting the first block 1 and the second block 2 to each other so that a pressure fluid can flow therethrough, and the driving means D clamp-drives the transmission member 31. , Its transmission member 31 is an engaging member 34
The locked portion 13b of the second block 2 is pulled to the first block 1 via the.

The invention of claim 1 has the following effects. When fixing the second block such as the work pallet to the first block such as the table or the clamp pallet, the both blocks are brought close to each other. Then, first, the positioning hole is automatically moved by the guide action of the tapered surface of the intermediate member, and the axis of the positioning hole precisely matches the axis of the plug portion of the first block. To do. Then, the intermediate member moves in the axial direction against the urging force of the elastic member, and the supported surface of the second block contacts or approaches the supporting surface of the first block. Then, the transmission member is clamp-driven by the drive means, and the transmission member pulls the second block to the support surface of the first block via the engagement tool and the locked portion. . Then, the second block is constrained by the plug portion through the tapered surface of the intermediate member and also by the support surface. Therefore, the second block can be smoothly and precisely positioned and fixed to the first block. Almost at the same time, the first joint of the first block and the second joint of the second block are connected in a hermetically sealed manner so that the pressure fluid can flow between the two blocks.

For this reason, it is not necessary to newly provide a connector for circulating the pressure fluid, the structure of the entire apparatus is simplified, and the piping work for the pressure fluid described above does not require any labor. Moreover, since the first joint is provided radially inward of the transmission member and the second joint is radially inward of the positioning hole, the entire apparatus can be made compact.

As shown in the invention of claim 2, it is preferable to add the following constitution to the invention of claim 1 described above. A first valve chamber 54 and a first valve seat 55 are sequentially provided in the first joint 51 in the distal direction, and a second valve chamber 64 and a second valve seat 65 are provided in the second joint 52 in the distal direction. The first tip end surface 56 provided on the peripheral wall of the first valve seat 55 and the second tip end surface 66 provided on the peripheral wall of the second valve seat 65 are annularly provided on at least one of the tip end surfaces 56. Of the first closing member 58 inserted into the first valve chamber 54 by the first closing spring 59. The second closing member 68, which is brought into contact with the first valve seat 55 of the above and protrudes from the above-mentioned first tip end surface 56 and is inserted into the above-mentioned second valve chamber 64, is closed by the second closing spring 69. The seat 65 is brought into contact with the seat 65 and is projected from the second tip surface 66.

The invention of claim 2 has the following effects. When connecting both joints in a hermetically sealed manner, it is only necessary to seal the end faces provided on the peripheral walls of each valve seat, so that the misalignment of the joints can be easily absorbed. Further, since it suffices to provide the sealing member on at least one of the two tip surfaces, the joint structures of both joints can be simplified and can be implemented at low cost.

In order to achieve the above-mentioned object, the invention of claim 3 is one in which a clamp device is configured as follows, as shown in FIGS. 1 to 3, 4 and 5, respectively. Is. A second block 2 such as a work pallet is detachably fixed to a first block 1 such as a table or a clamp pallet, and a transmission member 31 is inserted into the first block 1 and the transmission member 31 is driven by the driving means D. Is configured to be movable in the attachment / detachment direction by the above, and a first joint 51 for pressure fluid is provided on the first block 1 side inward of the transmission member 31 in the radial direction, and on the second block 2 side. The second joint 52 for pressure fluid is provided in the
1, the first valve chamber 54 and the first valve seat 55 are sequentially provided in the front end direction, and the second valve chamber 64 and the second valve chamber 64 are provided in the second joint 52.
The valve seat 65 is sequentially provided in the front end direction, and at least the first front end surface 56 provided on the peripheral wall of the first valve seat 55 and the second front end surface 66 provided on the peripheral wall of the second valve seat 65 are at least provided. An annular sealing member 57 is provided on one end face 56, and the sealing member 57 is provided.
Is projected from at least one of the front end surfaces 56, the first closing member 58 inserted into the first valve chamber 54 is brought into contact with the first valve seat 55 by the first closing spring 59, and No. 1 above the second end face 56,
The second closing member 68 inserted in the valve chamber 64 is attached to the second closing spring 6
The second valve seat 65 is abutted by 9 and projected from the second tip surface 66, thereby connecting the first joint 51 and the second joint 52 in a hermetically sealed state. At times, the pressure fluid is allowed to flow between the first block 1 and the second block 2, and the drive means D clamp-drives the transmission member 31 to cause the transmission member 31 to move. Engages the locked portion 13b of the second block 2 via the engagement tool 34 with the first block 1 described above.
Configured to pull to.

The invention according to claim 3 has the following effects. When fixing the second block such as the work pallet to the first block such as the table or the clamp pallet, first, the above two blocks are brought close to each other. Next, the transmission member is clamp-driven by the driving means, and the transmission member pulls the second block to the support surface of the first block via the engagement tool and the locked portion. To fix. Almost at the same time, the first
The first joint of the block and the second joint of the second block are connected in a hermetically sealed manner so that the pressure fluid can flow between the two blocks. Therefore, it is not necessary to newly provide a connector for circulating the pressure fluid, the configuration of the entire apparatus is simplified, and the piping work for the pressure fluid described above does not require any labor. Moreover, since the first joint is provided inward of the transmission member of the first block in the radial direction and the second joint is provided on the second block, the entire clamp device can be made compact. Moreover, in connecting the above-mentioned joints in a hermetically sealed manner, it is only necessary to seal the tip end surfaces provided on the peripheral walls of each valve seat, so that the misalignment of the above-mentioned joints can be easily absorbed. Further, since it suffices to provide the sealing member on at least one of the two tip surfaces, the joint structures of both joints can be simplified and can be implemented at low cost.

As shown in the invention of claim 4, it is preferable to add the following configuration to the invention of claim 2 or 3 above. The slide cylinder 38 is movably inserted into the transmission member 31, the first joint 51 is provided in the slide cylinder 38, and the protruding member 13 abutting on the slide cylinder 38 is protruded from the second block 2. The projecting member 13 is provided with the second joint 52, and the urging means 40 for advancing the slide cylinder 38 in the distal direction is provided.
Is set to a value larger than the urging force of the first closing spring 59, and when the first block 1 and the second block 2 are brought close to each other, the protruding member 13 causes The slide cylinder 38 is configured to retreat against the biasing means 40.

The invention according to claim 4 has the following operational effects. At the time of connecting the two joints, after sealing the two end faces with the sealing tool, the slide cylinder can be relatively moved in the axial direction against the biasing means. Therefore, it is possible to sufficiently absorb the positional deviation in the axial direction when connecting the both joints. In addition, since the sealing tool can be constantly pressed by the urging force of the urging means, the both joints can be surely kept in the tightly closed state.

According to a fifth aspect of the present invention, in the clamp device according to any one of the second to fourth aspects, the first
It is preferable that each of the closing member 58 and the second closing member 68 is formed of a ball. According to the invention of claim 5, when connecting both of the joints described above, not only radial misalignment but also misalignment of connection angle can be absorbed,
The connection of both joints mentioned above becomes smooth.

[0014]

1 to 3 show a first embodiment of the present invention. First, the structure of the clamp device of the present invention will be described with reference to the sectional view of FIG. The clamp pallet 1 as the first block is fixedly mounted on the upper surface of the table T of the machining center. A work pallet 2, which is a second block, is positioned and fixed on the clamp pallet 1 by a clamp device 4.
Although not shown, the work piece is attached to and detached from the upper surface of the work pallet 2 by a plurality of work clamps. The clamp device 4 includes a datum clamp 5 fixed to the clamp pallet 1 with a plurality of bolts (not shown) and a datum ring 6 fixed to the work pallet 2 with a plurality of bolts (not shown). .

A supported surface 2 is provided on the lower surface of the datum ring 6.
a is formed, and the socket hole 11 is opened in the supported surface 2a. A taper positioning hole 12 is formed in the lower half portion of the socket hole 11 so as to be upwardly recessed. Also,
A pull rod (projecting member) 13 is arranged in the positioning hole 12 described above. The pull rod 13 is arranged substantially coaxially with the positioning hole 12 of the above, and is supported by the work pallet 2 so as to be movable in a diametrical direction within a predetermined range. More specifically, a circular accommodating groove 14 is formed on the upper surface of the datum ring 6 in a plan view, and the accommodating groove 14 is formed.
The large-diameter portion 13a of the upper portion of the pull rod 13 is inserted in the diametrically spaced a predetermined gap. The large diameter part 13
The flange portion 6a of the datum ring 6 is in light contact with the lower surface of a.

The datum clamp 5 includes a cover block 16 fixed to the clamp pallet 1, a piston 17 inserted in a hermetically sealed state between the cover block 16 and the clamp pallet 1, and a lower side of the piston 17. The formed hydraulic chamber 18 and a clamp spring 19 mounted between the piston 17 and the cover block 16 are provided. The clamp spring 19 is composed of a plurality of disc springs stacked vertically, but may be a compression coil spring. The piston 17
The hydraulic chamber 18 and the clamp spring 19 constitute a driving means D of the clamp device 4.

An annular plug portion 21 is projected upward from the central portion of the cover block 16, and the plug portion 21 is inserted into the positioning hole 12. Further, the cover block 16 is slightly protruded upward on the outer periphery of the lower portion of the plug portion 21, and the upper surface of the annular protruding portion constitutes the support surface 1a. An annular intermediate member 23 is fitted onto the plug portion 21, and the intermediate member 23 is urged upward by three disc springs (elastic members) 24 and received by a retaining ring 25.

More specifically, the annular intermediate member 23 has an inner peripheral surface formed by a straight surface 27 and an outer peripheral surface formed by a tapered surface 28.
By providing a slit on the annular wall of the intermediate member 23 or providing a groove on the inner peripheral surface (neither is shown), the tapered surface 28 and the straight surface 27 can be expanded and contracted in the diameter direction. Has become. The straight surface 27 is supported on the outer peripheral surface of the plug portion 21 so as to be movable in the axial direction. The tapered surface 28 is formed so as to be upwardly tapered so as to engage with the tapered positioning hole 12 in a tapered manner. Further, an annular mounting groove 29 is formed in the cover block 16 on the outer periphery of the plug portion 21. The disc spring 24 is inserted into the mounting groove 29, and the lower portion of the intermediate member 23 is fitted into the mounting groove 29.

A cylindrical transmission member 31 is inserted into the cylindrical hole 21a of the plug portion 21 so as to be movable in the axial direction. A plurality of through holes 33 are formed in the upper part of the transmission member 31 at predetermined intervals in the circumferential direction, and an engagement ball (engagement tool) 34 is formed in each through hole 33 in the radially inner engagement position X ( (See FIG. 3 to be described later) and a radially outward disengagement position Y (see FIG. 1).
Alternatively, see FIG. 2) and movably supported. The engaging balls 3 are inserted into the cylindrical holes 21a of the plug portion 21.
Corresponding to No. 4, the retreat groove 36 and the pressing surface 37 are formed vertically.

A slide cylinder 38 is vertically movably inserted into the cylinder hole 31a of the transmission sleeve 31, and an advancing spring (biasing means) 4 is provided between the slide cylinder 38 and the spring receiver 39.
0 is installed. The slide spring 38 pushes the slide cylinder 38 upward by the advancing spring 40, and the lower end of the slide cylinder 38 is received by the shoulder portion of the cylinder hole 31a. As a result, the upper end surface of the slide cylinder 38 is positioned at substantially the same height as the upper end surface of the transmission member 31.

A means for cleaning the fitting surfaces of the clamp device 4 is provided. That is, the clamp pallet 1 is provided with a compressed air (cleaning fluid) supply port 41. A flow path 42 is formed between the cylindrical hole 21a of the plug portion 21 and the outer peripheral surface 31b of the transmission member 31, and the flow path 42 is connected to the supply port 41 by a communication hole 43. It Further, an intermediate portion of the communication hole 43 is communicated with the mounting groove 29.

Further, means for confirming that the workpiece (not shown) is seated at a predetermined position on the upper surface of the work pallet 2 is provided. The confirmation means includes a first joint 51 provided on the slide cylinder 38 and a second joint 52 provided on the pull rod 13.

The above-mentioned first joint 51 is constructed as follows. A first valve chamber 54 and a first valve seat 55 are sequentially provided in a cylinder hole of the slide cylinder 38 in an upward direction which is a front end direction, and a first front end surface 56 provided on a peripheral wall of the first valve seat 55 is provided. The annular sealing member 57 is fitted. The tip of the sealing member 57 is projected above the first tip surface 56.

A ball-shaped first closing member 58 is inserted into the above-mentioned first valve chamber 54. The first closing member 58 is the first
The closing spring 59 closes and abuts on the first valve seat 55, and projects upward from the first tip surface 56 and the sealing member 57. The lower end of the first closing spring 59 is received by the slide cylinder 38 via the first spring receiver 60. The biasing force of the advance spring 40 is set to a value larger than the biasing force of the first closing spring 59. The first through hole 6 is formed in the large diameter portion of the first spring receiver 60 at a predetermined interval in the circumferential direction.
1 is formed.

The second joint 52 is the first joint 5 described above.
The configuration is similar to that of No. 1 and is as follows. That is, the second valve chamber 64 and the second valve seat 65 are provided in the cylindrical hole of the pull rod 13.
And are sequentially provided downward in the direction of the tip. A second tip surface 66 facing the first tip surface 56 is provided on the peripheral wall of the second valve seat 65. The ball-shaped second closing member 68 inserted into the second valve chamber 64 is the second closing spring 69.
Is abutted against the second valve seat 65 by
The second tip surface 66 is projected downward. The upper end of the second closing spring 69 is received by the pull rod 13 via the second spring receiver 70. It should be noted that second through holes 71 are also formed in the large-diameter portion of the second spring receiver 70 at predetermined intervals in the circumferential direction.

The clamp device 4 operates as follows, as shown in FIGS. 1 to 3. FIG. 1 shows a state in which the work pallet 2 has begun to be mounted on the clamp pallet 1. FIG. 2 shows a state in which the work pallet 2 is mounted on the clamp pallet 1. Further, FIG. 3 shows a state in which the work pallet 2 is fixed to the clamp pallet 1.

In the state of FIG. 1, the pressure oil is supplied to the hydraulic chamber 18 through the pressure oil supply / discharge passage 73. As a result, the piston 17 raises the transmission member 31 against the clamp spring 19 by the hydraulic pressure of the hydraulic chamber 18, so that the engagement balls 34 face the retracting groove 36 and are free. It has become. Further, the intermediate member 23 is raised by the biasing force of the disc spring 24. Further, the slide cylinder 38 is raised by the advancing spring 40, and the first closing member 58 causes the first valve seat 5 to move.
5, and the second closing member 68 is in contact with the second valve seat 65.

Then, as shown in FIG. 1, when the work pallet 2 is started to be lowered with respect to the clamp pallet 1, compressed air for cleaning is supplied to the supply port 41. Then, the compressed air passes through the flow path 42 to clean the pressing surface 37 and the engagement balls 34, and then is expelled vigorously from the upper end of the flow path 42. Then, the locked portion 13b of the pull rod 13 and the top surface and the peripheral surface of the socket hole 11 are cleaned, and subsequently, the outer periphery of the plug portion 21 is cleaned, and then discharged laterally. The compressed air supplied to the mounting groove 29 is discharged to the outside after cleaning the fitting gap of the straight surface 27 of the intermediate member 23 and the fitting gap of the lower portion of the tapered surface 28.

It is preferable that the fitting gap 47 between the upper portion of the cylindrical hole 31a of the transmission member 31 and the upper portion of the outer peripheral surface of the slide cylinder 38 is communicated with the communication hole 43. In this case, the compressed air supplied to the fitting gap 47 is discharged from the upper end of the fitting gap 47 after cleaning the engaging balls 34, and the discharged compressed air is the engaged target. The lower peripheral surface of the stopper 13b is cleaned.

When the work pallet 2 is further lowered, the pressing portion 13d of the pull rod 13 enters the cylindrical hole 31a of the transmission member 31 and the slide cylinder 3 is inserted.
8, the taper positioning hole 12 is guided by the taper surface 28 of the intermediate member 23, and subsequently, as shown in FIG. 2, the flange portion 13c at the mid-height portion of the pull rod 13 is The work pallet 2 is received by the transmission member 31 in contact with the upper end surface of the transmission member 31. In this receiving state, an engagement gap α is formed between the tapered surface 28 of the intermediate member 23 and the tapered positioning hole 12, and at the same time, between the supporting surface 1a and the supported surface 2a. The contact gap β is formed in the. Then, in that state, the compressed air discharged from the upper end of the flow path 42 is
The engagement gap α and the contact gap β are vigorously cleaned, and then discharged to the outside.

Further, as described above, the pull rod 13
Lowering the slide cylinder 38 causes the first closing member 58 and the second closing member 68 to face each other as shown in FIG. The second closing member 6 is separated from the seat 55.
8 is separated from the second valve seat 65, and then the first tip surface 56 and the second tip surface 66 (see FIG. 1) are sealed by the sealing member 57. As a result, the inlet passage 76 of the clamp pallet 1 is made into the cover block 16 described above.
Through the horizontal passage 77, the lateral hole 78 of the transmission member 31, the lateral hole 79 of the slide cylinder 38, the valve opening gap of the first closing member 58, and the valve opening gap of the second closing member 68. It communicates with the outlet passage 80 of the work pallet 2.

When the pressure oil in the hydraulic chamber 18 is discharged from the supply / discharge passage 73 in the state shown in FIG. 2, the clamp spring 19 strongly lowers the transmission member 31 via the piston 17. Then, first, the work pallet 2 descends by its own weight following the descending of the transmission member 31, and the taper positioning hole 12 forms the intermediate member 2.
It abuts the tapered surface 28 of No. 3. As a result, the work pallet 2 slightly compresses the disc spring 24 via the intermediate member 23, and the taper positioning hole 12 is aligned and moved so that the axial center thereof is the plug portion 21.
Align with the axis of.

At about the same time, as shown in FIG. 3, the pressing surface 37 of the plug portion 21 moves the engagement balls 34 to the engagement position X, and the transmission member 3 is moved.
1 strongly lowers the work pallet 2 via the engaging balls 34 and the pull rod 13. Then, the taper positioning hole 12 is replaced by the intermediate member 23.
The taper surface 28 is strongly taper-engaged for centering movement, the axis of the taper positioning hole 12 precisely matches the axis of the plug portion 21, and the disc spring 24
Against this, the intermediate member 23 is further lowered, and the supported surface 2a is received by the supporting surface 1a. As a result, the work pallet 2 is constrained in the horizontal direction by the plug portion 21 via the intermediate member 23 whose diameter is reduced by the taper positioning hole 12 and is constrained in the vertical direction by the support surface 1a. As a result, the work pallet 2 can be precisely and strongly positioned and fixed to the clamp pallet 1. It is preferable that the pressing surface 37 is slightly inclined. In this case, due to the wedge action of the inclined pressing surface,
Since the driving force of the transmission member 31 can be doubled and transmitted to the pull rod 13, the work pallet 2 can be strongly lowered.

After the clamp shown in FIG. 3 is completed, the contact gap β in FIG. 2 disappears, and the supporting surface 1a is removed.
Since the space between the support surface 2a and the supported surface 2a is hermetically sealed, there is no escape path for the compressed air for cleaning, and the pressure of the supply port 41 increases. By detecting the pressure increase with a pressure sensor (not shown), it is possible to automatically confirm the completion of the clamp. Further, compressed air for seating confirmation is supplied to the inlet passage 76. Then, when the workpiece (not shown) is placed on the upper surface of the work pallet 2, the outlet passage 80 is closed, so that the pressure of the compressed air supplied to the inlet passage 76 is reduced. To rise. Another pressure sensor that pressure rise
By detecting with (not shown), it is possible to confirm that the above-mentioned workpiece (not shown) is seated.

When switching from the clamped state of FIG. 3 to the unclamped state of FIG. 2, pressure oil may be supplied to the hydraulic chamber 18 in the state of FIG. Then, Figure 2
As shown in FIG. 3, the piston 17 raises the transmission member 31 by the hydraulic pressure of the hydraulic chamber 18, and the balls 34 are switched to the disengagement position Y facing the retraction groove 36. Is allowed (in this FIG. 2, the already switched state is shown) and the transmission member 31
The upper portion of the flange portion 13 of the pull rod 13
It touches c and pushes up the work pallet 2. Therefore, as shown in FIG. 2, the engagement gap α is formed on the upper side of the intermediate member 23 and the supporting surface 1 is formed.
A contact gap β is formed on the upper side of a. Thereby, the work pallet 2 can be easily removed from the clamp pallet 1.

The first embodiment described above has the following advantages. In connecting the first joint 51 and the second joint 52 in a hermetically sealed manner, it is only necessary to seal the tip surfaces 56 and 66 provided on the peripheral walls of the valve seats 55 and 65, respectively. The misalignment between the joints 51 and 52 can be easily absorbed. Moreover, since it is only necessary to provide the sealing member 57 on at least one of the two tip surfaces 56 and 66, the connecting structure is simple and the manufacturing can be performed at low cost. Furthermore, since the first closing member 58 and the second closing member 68 are formed in a ball shape, it is possible to absorb the deviation of the connection angle in addition to the radial misalignment, and thus the connection of both joints 51 and 52 described above. Becomes smooth.

A slide cylinder 38 is inserted into the transmission member 31 so as to be movable in the axial direction in a hermetically sealed manner, and the slide cylinder 38 is provided with the first valve chamber 54 and the first valve seat 55. The slide cylinder 38 is urged toward the tip end by the advancing spring 40, and the urging force of the advancing spring 40 is changed to the first
Since it is set to a value larger than the biasing force of the closing spring 59,
It has the following advantages: When connecting the joints 51 and 52, the two tip surfaces 56 and 66 are connected to the sealing member 57.
After sealing by, the slide cylinder 38 can be relatively moved in the vertical direction against the advancing spring 40. Therefore, it is possible to absorb the positional deviation in the axial direction when connecting the joints 51 and 52. Besides, the advance spring 4 mentioned above
Since the sealing member 57 can be constantly pressed by the urging force of 0, both the joints 51 and 52 can be surely kept in the hermetically sealed state.

FIG. 4, FIG. 5, and FIG. 6 show the second embodiment, the third embodiment, and the fourth embodiment, respectively.
It is a figure similar to FIG. In these other embodiments, members having the same configurations as those of the above-described first embodiment are basically given the same reference numerals, and only configurations different from those of the first embodiment will be described.

The second embodiment shown in FIG. 4 is different from the first embodiment in the following points. The positioning hole 12 formed in the work pallet 2 is formed straight. The straight surface 27 on the outer periphery of the intermediate member 23 is supported in the straight positioning hole 12 so as to be vertically movable. The intermediate member 23 is a plurality of disc springs (elastic members) 2
The intermediate member 23 is urged downward by 4 and the stop ring 25 fitted in the lower part of the positioning hole 12 is lowered.
Have been thwarted by. The tapered surface 28 formed on the inner surface of the intermediate member 23 is taper-engaged with the outer peripheral surface of the plug portion 21. The tapered surface 28 is formed so as to be narrowed upward.

The third embodiment shown in FIG. 5 differs from the first embodiment in the following points. The locked portion 13b of the work pallet 2 is provided in the socket hole 11 above the positioning hole 12. The plurality of engagement balls 34 are supported by the plug portion 21. The retracting groove 36 and the pressing surface 37 for the engagement balls 34 are formed on the outer peripheral surface of the transmission member 31. By pressing the transmission member 31 downward, the pressing surface 37 switches the engagement ball 34 to the outer engagement position X. The slide cylinder 38 is vertically movably inserted into the upper portion of the transmission member 31, and the slide pipe 38 is provided with the first joint 51. The projecting member 13 is screwed to the top wall of the socket hole 11, and the projecting member 13 is provided with the second joint 52. It should be noted that a plurality of ejection ports 82 for the compressed air for cleaning are formed obliquely above the plug portion 21.

The fourth embodiment of FIG. 6 differs from the first embodiment described above in the following points. The first joint 51 and the second joint 52 supply pressure oil to a work clamp (not shown) attached to the upper surface of the work pallet 2 instead of supplying compressed air for seating confirmation. Used for discharging. More specifically, it is as follows.

The first joint 51 is a casing 84 screwed to the clamp pallet 1 in a hermetically sealed manner, a long rod-shaped first closing member 58 mounted in the casing 84, and a poppet-shaped first reverse member. And a stop member 85. Then, the transmission member 3 is attached to the casing 84.
1 and the piston 17 are externally fitted in a hermetically sealed manner. Further, the second joint 52 includes a long rod-shaped second closing member 68 and a poppet-shaped second check member 86 that are mounted in the pull rod 13.

When the work pallet 2 is fixed to the clamp pallet 1 as shown in the figure, the lower part of the pull rod 13 resists the advancing spring 40 and the slide cylinder 38.
To lower the first closing member 58 and the second closing member 6 described above.
8 and up and down face each other. As a result, first, the upper end of the first closing member 58 is separated from the first valve seat 55 and the lower end of the second closing member 68 is separated from the second valve seat 65, and then the first reverse The stop member 85 is separated from the first check valve seat 88, and the second check member 86 is separated from the second check valve seat 89.

When the pressure oil is supplied from the clamp pallet 1 to the work clamp (not shown), the pressure oil may be supplied to the clamping inlet passage 76 of the clamp pallet 1. Then, the pressure oil is supplied to the casing 8 described above.
4, the first cylindrical filter 91 and the first check valve seat 88 described above.
Opening gap, the second cylindrical filter 92, the first valve seat 55 opening gap, the second valve seat 65 opening gap, and the third cylindrical filter 9
3 and the opening gap between the second check valve seat 89 and the fourth cylindrical filter 9
4 and the exit passage 80 of the work pallet 2 in order,
It is supplied to the work clamp (not shown). The pressure oil of the work clamp is discharged to the inlet passage 76 of the clamp pallet 1 in the route opposite to the above.

After the supply or discharge of the pressure oil is completed, the work pallet 2 is raised with respect to the clamp pallet 1. Then, first, the first check member 85 contacts the first check valve seat 88 by the first check spring 96, and the second check member 86 causes the second check spring 9 to move.
7 contacts the second check valve seat 89, and then the advancing spring 40 and the first closing spring 59 contact the first valve seat 55 with the upper end of the first closing member 58 and the second closing valve 58. The lower end of the second closing member 68 contacts the second valve seat 65 by the closing spring 69.

The above-described respective embodiments can be modified as follows. The intermediate member 23 of the clamp device is not limited to the illustrated annular body, and may be a plurality of divided bodies arranged in an annular shape. The elastic member that presses the intermediate member 23 may be formed of another type of spring such as a compression coil spring or rubber instead of the illustrated disc spring 24. The intermediate member 23 may be supported on the work pallet 2 also in the third embodiment of FIG. 5 and the fourth embodiment of FIG. 6 as in the second embodiment of FIG. Good. Further, the intermediate member 23 may be omitted from the clamp device of the present invention. Further, as the engaging tool 34 of the clamp device, a hook, a collet or the like can be used instead of the illustrated ball. The clamp device can also be clamp-driven by fluid pressure such as hydraulic pressure or pneumatic pressure, instead of being driven by spring force.

When the clamp device is unclamped,
The upper end surface of the transmission member 31 is brought into contact with the flange portion 13c of the pull rod 13 so that the work pallet 2
However, instead of this, the upper end surface of the transmission member 31 may be brought into contact with the top wall of the positioning hole 12 (top wall of the socket hole 11). Further, the pull rod 13 may be fixed to the work pallet 2 instead of being supported by the work pallet 2 so as to be movable in the diameter direction. Also in the first embodiment of FIGS. 1 to 3, the second embodiment of FIG. 4 and the third embodiment of FIG. 5, as with the fourth embodiment of FIG. The second joint 52 may supply and discharge the pressure oil for the work clamp.

The first block may be a table of a machining center or various machines in place of the illustrated clamp pallet 1. The second block may be a workpiece instead of the illustrated work pallet 2. The first block and the second block may be arranged upside down, and instead of being connected in the vertical direction as illustrated, may be connected in the horizontal direction or the diagonal direction. . In addition, the clamp device of the present invention,
The application of the present invention is not limited to the clamping of the work pallet or the workpiece, and it is needless to say that the invention can also be used for the clamping of a mold or an attachment. The clamp device is not limited to a plurality of sets.
It is also available as a set only.

[Brief description of drawings]

FIG. 1 is a sectional view in elevation showing a first embodiment of a clamp device according to the present invention, in which a work pallet, which is a second block, has started to be attached to a clamp pallet, which is a first block.

FIG. 2 is a view similar to FIG. 1 above, showing a state in which the work pallet is mounted on the clamp pallet.

FIG. 3 is a view similar to FIG. 1 above, showing a state in which the work pallet is fixed to the clamp pallet.

FIG. 4 is a view similar to FIG. 3 described above, showing a second embodiment of the clamp device.

FIG. 5 is a view similar to FIG. 3 above showing a third embodiment of the clamping device.

FIG. 6 is a view similar to FIG. 3 above, showing a fourth embodiment of the clamping device.

[Explanation of reference numerals] 1 ... First block (clamp pallet), 2 ... Second block (work pallet), 12 ... Positioning hole, 13 ... Projecting member (pull rod), 13b ... Locked portion, 21 ... Plug portion, 23 ... Intermediate member, 24 ... Elastic member (disc spring), 31 ...
Transmission member, 34 ... Engaging tool (engaging ball), 38 ... Slide cylinder, 40 ... Energizing means (advancing spring), 51 ... First joint, 52
... second joint, 54 ... first valve chamber, 55 ... first valve seat, 56 ...
First tip surface, 57 ... Sealing device, 58 ... First closing member, 59
... first closing spring, 64 ... second valve chamber, 65 ... second valve seat, 6
6 ... 2nd front end surface, 68 ... 2nd closing member, 69 ... 2nd closing spring, D ... drive means.

Claims (5)

[Claims] 1. A clamp device for removably fixing a second block (2) to a first block (1), comprising a positioning hole (12) opened in the second block (2).
And a plug portion (21) protruding from the first block (1) so as to be inserted into the positioning hole (12), and between the plug portion (21) and the positioning hole (12). An intermediate member (23) which is interposed in the annular space and is expandable and contractible in a diametrical direction. The intermediate member (23) is connected to the plug portion (21) and the positioning hole (12). One of the two (21,12)
Is movably supported within a predetermined range in the axial direction and is configured to be capable of taper engagement with the other (12, 21), and the intermediate member (23) is elastically engaged with the taper engagement (24). The transmission member (31) is inserted into the plug portion (21), and the transmission member (31) is configured to be movable in the attachment / detachment direction by the drive means (D). A first joint (51) for pressure fluid is provided on the inner side of the transmission member (31) in the radial direction on the side of the first block (1), and at the same time, in the radial direction of the positioning hole (12). When a second joint (52) for pressure fluid is provided on one side of the second block (2) and the first joint (51) and the second joint (52) are connected in a hermetically sealed manner, The pressure fluid is allowed to flow between the first block (1) and the second block (2), and the drive means (D) is By the transmission member (31) to drive the clamp, the transmission member (31) engaging member
The locked portion (1) of the second block (2) is inserted through the (34).
3b) is configured to be pulled to the above-mentioned first block (1), a clamp device characterized by the above-mentioned. 2. The clamp device according to claim 1, wherein the first joint (51) has a first valve chamber (54) and a first valve seat (5).
5) and 5) are sequentially provided in the distal direction, and the second joint
The second valve chamber (64) and the second valve seat (65) are sequentially provided in the (52) in the front end direction, and the first front end surface (5) provided on the peripheral wall of the first valve seat (55).
6) and at least one tip surface (56) of the second tip surface (66) provided on the peripheral wall of the second valve seat (65) is provided with an annular sealing member (57) to seal the same. The stopper (57) is projected from at least one of the tip surfaces (56), and the first closing member (58) inserted into the first valve chamber (54) is moved by the first closing spring (59). The second closing member (6) which is brought into contact with the first valve seat (55) and protrudes from the first tip end surface (56) and is inserted into the second valve chamber (64).
8) by means of the second closing spring (69)
5) A clamp device characterized in that the clamp device is brought into contact with the second end face (66) and abuts against the second end face (66). 3. A clamp device for detachably fixing a second block (2) to a first block (1), wherein a transmission member (31) is inserted into the first block (1), and the transmission thereof is performed. The member (31) is configured to be movable in the attachment / detachment direction by the drive means (D), and the member for pressure fluid is provided radially inward of the transmission member (31) to the first block (1) side. The first joint (51) is provided, and the second joint (52) for pressure fluid is provided on the side of the second block (2).
Is provided, and the first valve chamber (54) and the first valve seat (5
5) and 5) are sequentially provided in the tip direction, and the second joint
A second valve chamber (64) and a second valve seat (65) are sequentially provided in (52) in the front end direction, and a first front end surface (56) provided on a peripheral wall of the first valve seat (55).
And a second tip surface provided on the peripheral wall of the second valve seat (65)
An annular sealing member (57) is provided on at least one end surface (56) of (66), and the sealing member (57) is projected from the at least one end surface (56), First valve chamber
The first closing member (58) inserted in (54) is attached to the first closing spring (58).
(59) causes the first valve seat (55) to come into contact with the first valve seat (55) and protrudes from the first tip surface (56),
The second closing member (68) inserted in the valve chamber (64) is brought into contact with the second valve seat (65) by the second closing spring (69) and protrudes from the second tip surface (66). As a result, when the first joint (51) and the second joint (52) are connected in a hermetically sealed manner, the first block (1) and the second block (2) are connected to each other. A pressure fluid is allowed to flow between them, and the drive means (D) clamp-drives the transmission member (31) so that the transmission member (31) engages with the engaging member.
The locked portion (1) of the second block (2) is inserted through the (34).
3b) is configured to be pulled to the above-mentioned first block (1), a clamp device characterized by the above-mentioned. 4. The clamp device according to claim 2, wherein a slide cylinder (38) is movably inserted into the transmission member (31), and the first joint (51) is inserted in the slide cylinder (38).
And a protruding member (13) abutting on the slide cylinder (38) is protruded from the second block (2), and the protruding member (13) is provided.
The second joint (52) is provided in the urging means, and the urging means for advancing the slide cylinder (38) in the distal direction.
(40) is provided, and the urging force of the urging means (40) is set to a value larger than the urging force of the first closing spring (59), and the first block (1) and the second block When the block (2) is brought close to the block (2), the protruding member (13) is configured to retract the slide cylinder (38) against the biasing means (40). Clamp device. 5. The clamping device according to claim 2, wherein the first closing member (58) and the second closing member (68).
And a ball-shaped clamping device, respectively.