JP2017100271A - Clamp device - Google Patents

Abstract

To position an object to be clamped with respect to a housing.
A first tube portion (31) of a support tube (30) is inserted into a hole (26a) of an object to be clamped (26), and a second tube portion (32) of the support tube (30) is the housing. It is inserted into the accommodation hole (19) of (1) so as to be movable in the vertical direction. A clamp rod (20) is inserted into the support cylinder (30) so as to be movable in the vertical direction. An engagement member (27) supported on the cylinder wall of the first cylinder part (31) so as to be movable in the radial direction is provided on the wedge part (25) provided on the upper end side of the clamp rod (20) from the upper end side. Engaged. A first positioning portion (45) that can be fitted to the inner peripheral surface of the hole (26a) is provided on the outer periphery of the first tube portion (31). A second positioning portion (50) that can be fitted to the inner peripheral surface of the housing hole (19) of the housing (1) is provided on the outer periphery of the second cylindrical portion (32).
[Selection] Figure 2

Description

  The present invention relates to a clamp device having a positioning function.

Conventionally, this type of clamping device is described in Patent Document 1 (Japan, JP 2009-214293 A). The prior art is configured as follows.
A support cylinder is inserted into the upper part of the housing so as to be movable in the vertical direction. A piston is inserted in the lower part of the housing so as to be movable in the vertical direction. A clamp rod connected to the piston so as to be movable in the horizontal direction is inserted into the support cylinder. An engaging member that can engage with the hole of the clamp object is supported by the support cylinder from below. A wedge surface formed on the upper end portion of the clamp rod is wedge-engaged with the engaging member from above.

  JP 2009-214293 A

The above prior art has the following problems.
When the hole of the clamp object is externally fitted to the clamp rod, there may be a case where a misalignment occurs between the clamp rod and the hole of the clamp object. In that case, the clamp rod is movable in the horizontal direction so as to absorb the misalignment. For this reason, a clamp target cannot be positioned with respect to the housing.
An object of the present invention is to position an object to be clamped with respect to a housing.

In order to achieve the above object, according to the present invention, for example, as shown in FIGS. 1 to 3B, 4A and 4B, 5A and 5B, or FIG. 6, the clamping device is configured as follows.
Driving means 5 is arranged on the base end side of the housing 1. The first cylinder portion 31 of the support cylinder 30 is inserted into the hole 26 a of the clamp object 26. The second cylinder portion 32 of the support cylinder 30 is inserted into the housing hole 19 of the housing 1 so as to be movable in the axial direction. A clamp rod 20 inserted into the support cylinder 30 is connected to the drive means 5. An engaging member 27 is supported on the cylindrical wall of the first cylindrical portion 31 so as to be movable in the radial direction. A wedge portion 25 provided on the distal end side of the clamp rod 20 engages with the engaging member 27 from the distal end side. The urging means 38 urges the support cylinder 30 toward the distal end side with a predetermined force. A first positioning portion 45 that can be fitted to the inner peripheral surface of the hole 26 a is provided on the outer periphery of the first tube portion 31. Second positioning portions 50, 80, 90 that can be fitted to the inner peripheral surface of the accommodation hole 19 are provided on the outer periphery of the second cylindrical portion 32.

The present invention has the following effects.
The second positioning part positions the second cylinder part of the support cylinder in the radial direction (direction orthogonal to the axial direction) with respect to the housing hole of the housing, and the first positioning part is the first support part of the support cylinder. The clamping object is positioned in the radial direction. Thereby, the clamp apparatus of this invention can position a clamp target object to a radial direction with respect to a housing.

In the present invention, the following configurations (1) to (5) are preferably added.
(1) The first positioning portion 45 is continuously formed in the circumferential direction in the first tube portion 31.
In this case, the clamping object can be positioned in the radial direction with respect to the first cylinder part by fitting the first positioning part into the hole of the clamping object.

(2) The first positioning portion 45 includes a pair of first projecting portions 46 and 46 formed so as to face each other with the axis of the first cylindrical portion 31 interposed therebetween, and the first projecting portions 46 and 46. And first relief portions 48, 48 formed therebetween.
In this case, the clamp object can be positioned in the direction in which the pair of first protrusions face each other. In addition, when a misalignment between the accommodation hole and the hole of the clamp object occurs in a direction in which the pair of first relief portions face each other, the misalignment is absorbed by the first relief portion.

(3) The second positioning portion 50 is formed continuously in the circumferential direction on the second cylinder portion 32.
In this case, the second positioning portion is fitted to the inner peripheral surface of the housing hole, thereby positioning the second tube portion in the radial direction with respect to the housing hole of the housing.

(4) The second positioning portion 50 includes a pair of second projecting portions 51 and 51 formed so as to face each other with the axis of the second cylindrical portion 32 interposed therebetween, and the second projecting portions 51 and 51. 2nd relief parts 53 and 53 formed between.
In this case, the clamp object can be positioned in the direction in which the pair of second protrusions face each other with respect to the second tube portion. Further, when the misalignment between the accommodation hole and the hole of the clamp object occurs in the direction in which the pair of second relief portions face each other, the misalignment is absorbed by the second relief portion.

(5) The second positioning portions 80 and 90 can be fitted to the inner peripheral surface of the accommodation hole 19 through intermediate members 82 and 92.
In this case, the second cylinder portion of the support cylinder is positioned in the radial direction with respect to the accommodation hole by fitting the second cylinder portion of the support cylinder to the inner peripheral surface of the accommodation hole via the intermediate member.

FIG. 1 shows a first embodiment of the present invention, and is a cross-sectional view of a clamp device in an unclamped state. FIG. 2 is a view similar to FIG. 1 showing a clamped state of the clamp device. 3A is a partially enlarged view corresponding to an arrow view taken along line IIIA-IIIA in FIG. 3B is a partially enlarged view corresponding to an arrow view taken along line IIIB-IIIB in FIG. FIG. 4A shows a first modification of the first embodiment, and is similar to FIG. 3A described above. FIG. 4B is a view similar to FIG. 3B above. FIG. 5A shows a second modification of the first embodiment and is similar to FIG. 3A described above. FIG. 5B is a partial view corresponding to an arrow view taken along line VB-VB in FIG. 5A. FIG. 6 shows a second embodiment of the present invention and is similar to FIG.

1 to 3B show a first embodiment of the present invention. First, the structure of the clamping device will be described with reference to FIG.
A housing 1 is fixed to a table T as a fixed base, and the housing 1 includes a lower housing 2 and an upper housing 3 that are formed in order from the lower side. The lower housing 2 and the upper housing 3 are fixed by a plurality of bolts (not shown).

  A hydraulic cylinder (driving means) 5 is disposed in the lower housing 2. The hydraulic cylinder 5 includes a cylinder hole 6 penetrating upward from the lower surface of the lower housing 2 and a piston 10 inserted into the cylinder hole 6. The piston 10 includes a piston body 11 and a piston rod 12 that are formed in order from below. The piston body 11 is inserted into the large-diameter hole 6 a of the cylinder hole 6 in the up-down direction (axial direction) so as to be tightly inserted, and the piston rod 12 is inserted into the small-diameter hole 6 b of the cylinder hole 6 in a close-tight manner.

  An unclamping chamber 13 of the hydraulic cylinder 5 is formed below the piston body 11, and a clamping chamber 14 of the hydraulic cylinder 5 is formed above the piston body 11. An unclamping pressure oil supply / discharge passage 15 formed in the table T is communicated with the unclamping chamber 13. A clamping oil supply / discharge passage 16 formed in the lower housing 2 is communicated with the clamping chamber 14.

  As shown in FIG. 2, the first cylinder portion 31 of the support cylinder 30 protruding upward from the upper housing 3 is inserted into the hole 26 a of the workpiece (clamping object) 26 so as to be engageable. The first cylinder portion 31 has a top wall and a peripheral wall. Further, the second cylinder portion 32 of the support cylinder 30 is inserted into the accommodation hole 19 formed in the upper housing 3 so as to communicate with the cylinder hole 6 so as to be movable in the vertical direction. A cylindrical hole 34 of the support cylinder 30 is constituted by the inner peripheral hole of the first cylindrical part 31 and the inner peripheral hole of the second cylindrical part 32.

  The clamp rod 20 is inserted into the cylindrical hole 34 described above. The axial center of the clamp rod 20 is arranged in parallel to the axial center of the piston 10 with a predetermined interval leftward. The clamp rod 20 includes a connecting member 21 and a clamp rod main body 22 provided in order from the lower side. A concave portion 21 a is formed in the lower right portion of the connecting member 21, and faces the convex portion 12 a that protrudes leftward from the upper end portion of the piston rod 12. By inserting the convex portion 12a of the piston rod 12 into the concave portion 21a of the connecting member 21 from the right side, the piston rod 12 of the piston 10 and the connecting member 21 of the clamp rod 20 are connected. Further, a T leg 22 a formed at the lower end of the clamp rod body 22 is attached to the T groove 21 b formed in the upper part of the connecting member 21. Three wedge surfaces (wedge portions) 25 are formed on the outer periphery of the upper portion of the clamp rod main body 22 at a predetermined interval in the circumferential direction, and are formed so as to move away from the axis as the wedge surface 25 moves upward.

  As shown in FIG. 3B (and FIG. 1), the opening 33 is formed in the circumferential direction at a predetermined interval in the circumferential direction on the circumferential wall of the first cylindrical portion 31. The engaging member 27 is supported in the opening 33 from below so as to be movable in the radial direction. The engaging member 27 is inserted into the hole 26a of the work 26 so as to be engageable. As shown in FIG. 1, the inclined surface 28 is formed on the inner peripheral wall of each engagement member 27 so as to move away from the axis of the clamp rod 20 as it goes upward. The wedge surface 25 of the clamp rod body 22 is wedge-engaged with the inclined surface 28 from above. The engaging member 27 is engaged with the wedge portion 25 provided on the distal end side of the clamp rod 20 from the distal end side. A plurality of saw-toothed projections 29 are formed in the vertical direction on the outer peripheral portion of each engaging member 27.

  An advancing spring 36 made of a compression coil spring is attached to the spring chamber 35 disposed below the support cylinder 30. The advance spring 36 urges the engaging member 27 upward with a predetermined force via the spring receiver 37 and the support cylinder 30. That is, in this embodiment, the advancing spring 36 and the spring receiver 37 constitute a biasing means 38 that pushes up the support cylinder 30 with a predetermined force.

A groove 27a is formed in the circumferential direction on the outer peripheral portion of the engaging member 27, and a groove 30a is formed in the circumferential direction on the outer peripheral portion of the support tube 30 at a height position corresponding to the groove 27a. A thin ring 40 made of an elastic body such as rubber or a leaf spring is attached to the groove 27 a of the engaging member 27 and the groove 30 a of the support cylinder 30. The ring 40 urges the engaging member 27 inward in the radial direction. As a result, the engagement member 27 is accommodated by the ring 40 inward in the radial direction from the outer peripheral surface of the support tube 30. As a result, it is possible to prevent the workpiece 26 from colliding with the engaging member 27 when the hole 26 a of the workpiece 26 is externally fitted to the support cylinder 30.
Further, a dust seal 41 is disposed between the accommodation hole 19 and the outer peripheral wall of the support cylinder 30.

  As shown in FIG. 3B, the first positioning portion 45 is continuously formed in the circumferential direction on the outer peripheral portion of the first cylinder portion 31 of the support cylinder 30. The first positioning portion 45 is fitted into the hole 26 a of the workpiece 26 with a first fitting gap 47. The dimension of the first fitting gap 47 is preferably set in the range of 0.005 mm to 0.030 mm, and more preferably in the range of 0.005 mm to 0.010 mm.

  The second positioning portion 50 is formed continuously in the circumferential direction on the second cylindrical portion 32. The second positioning portion 50 is fitted to the inner peripheral surface of the accommodation hole 19 with a second fitting gap 52 therebetween. The dimension of the second fitting gap 52 is preferably set in the range of 0.005 mm to 0.030 mm, and more preferably in the range of 0.005 mm to 0.010 mm.

The clamp device having the above-described configuration is provided with an operation abnormality (clamp failure) detection mechanism 55. As shown in FIG. 1, the detection mechanism 55 is configured as follows.
A seating detection hole 57 is opened in the upper surface 3 a of the upper housing 3. The seating detection hole 57 communicates with the air supply path 58. The air supply path 58 communicates with the valve chamber 60 of the clamping failure detection mechanism 55, and a valve seat 62 is formed in the valve chamber 60. The valve chamber 60 is communicated with an air discharge path 61 formed in the upper housing 3. A mounting hole 63 is formed in the upper part of the piston rod 12, and a lower part of the valve member 64 is inserted into the mounting hole 63 so as to be movable up and down. Is inserted in a tightly sealed manner. A valve face 65 is formed on the upper portion of the valve member 64, and an advance spring 66 attached to the lower side of the valve member 64 urges the valve member 64 toward the valve seat 62. In addition, a pin 67 protruding in the horizontal direction from the inner peripheral wall of the mounting hole 63 is inserted into a long hole 68 formed in the middle of the valve member 64 in the height direction.

As shown in FIGS. 1 and 2, the clamp device having the above configuration operates as follows.
In the unclamped state of FIG. 1, the pressure oil in the clamp chamber 14 is discharged and the pressure oil is supplied to the unclamp chamber 13. Thereby, the piston 10 and the clamp rod 20 are moved to the raised position, and the support cylinder 30 is held at the raised position by the advance spring 36. At this time, the engagement member 27 is switched to the reduced diameter state by the elastic force of the ring 40.
Further, the valve member 64 of the detection mechanism 55 is raised by the advance spring 66, and the valve surface 65 is in contact with the valve seat 62. As a result, the clamping failure detection mechanism 55 is closed.

  In the unclamped state, the workpiece 26 is lowered by some lifting means or its own weight, and the hole 26 a of the workpiece 26 is fitted onto the first cylinder portion 31 of the support cylinder 30. Then, the inner peripheral wall of the hole 26 a of the work 26 is fitted into the first positioning portion 45. Next, the lower surface 26 b of the workpiece 26 is received by the upper surface 3 a of the upper housing 3 and the seating detection hole 57 is closed. Subsequently, when pressurized air is supplied to the seating detection hole 57 in this state, the detection pressure increases. As a result, the seating state of the workpiece 26 is detected.

  When the clamp device is switched from the unclamped state of FIG. 1 to the clamped state of FIG. 2, the pressure oil in the unclamp chamber 13 is discharged and the pressure oil is supplied to the clamp chamber 14. Then, first, the piston 10 and the clamp rod 20 are lowered with respect to the support cylinder 30 held at the raised position by the urging force (predetermined force) of the advance spring 36. Next, the engagement member 27 is expanded from the reduced diameter state (moved outward in the radial direction) by the wedge surface 25 of the clamp rod 20, and the engagement member 27 is engaged with the inner peripheral surface of the hole 26 a of the workpiece 26. Match. Subsequently, the engaging member 27 in a state of biting into the inner peripheral surface of the hole 26a pulls the work 26 downward through the hole 26a. At the same time, the engaging member 27 presses the support cylinder 30 downward against the urging force (predetermined force) of the advance spring 36. Thereby, the work 26 is strongly pressed against the upper surface 3 a of the upper housing 3. As a result, the clamping device is switched to the clamping state of FIG.

  In this clamped state, when the piston 10 is moved to the lowered position, the pin 67 of the detection mechanism 55 is also moved to the lowered position, but a contact gap remains between the pin 67 and the lower end wall of the long hole 68. Has been. For this reason, the detection mechanism 55 is maintained in a closed state. Therefore, in the clamped state, when pressurized air for detecting a clamping failure is supplied to the air supply path 58, the pressure in the air supply path 58 increases. By detecting the rising pressure, it is detected that the piston 10 has been moved to a predetermined clamp stroke region (not in a clamp failure state).

  When the clamp device is switched from the clamp state of FIG. 2 to the unclamp state of FIG. 1, the pressure oil in the clamp chamber 14 is discharged and the pressure oil is supplied to the unclamp chamber 13. As a result, the clamping device is switched to the unclamped state by a procedure almost opposite to the above-described clamping operation.

  By the way, due to causes such as the diameter of the hole 26a of the work 26 being larger than the allowable range, slipping may occur between the inner peripheral surface of the hole 26a and the engagement member 27 having an enlarged diameter during the above-described clamp driving. is there. In this case, the piston 10 and the clamp rod 20 are excessively lowered from a predetermined clamp stroke region (becomes a clamp failure state). At this time, the piston 10 lowers the valve member 64 through the pin 67 and the lower end wall of the long hole 68 of the valve member 64, the valve surface 65 of the valve member 64 is separated from the valve seat 62, and the detection mechanism 55 is opened. To be spoken. For this reason, the pressurized air supplied to the air supply path 58 is discharged to the outside through the valve opening gap, the valve chamber 60, and the air discharge path 61, and the detected pressure of the air supply path 58 decreases. Thereby, it is detected that the clamping device is in a clamping failure state.

The above embodiment has the following advantages.
The second positioning portion 50 is fitted into the receiving hole 19 of the upper housing 3 with a second fitting gap 52 therebetween, thereby positioning the support cylinder 30 in the radial direction with respect to the upper housing 3. Further, the first positioning portion 45 is fitted into the hole 26 a of the work 26 with a first fitting gap 47, thereby positioning the work 26 in the radial direction with respect to the support cylinder 30. As a result, the clamp device can position the workpiece 26 in the radial direction with respect to the housing 1.
Further, the engaging member 27 is engaged with the upper portion of the hole 26a of the work 26, and the first positioning portion 45 is fitted with the lower portion of the hole 26a. Since the diameter of the upper part of the hole 26a and the diameter of the lower part of the hole 26b are set to the same dimension, the processing of the hole 26a is easy.

  4A, FIG. 4B, FIG. 5A, FIG. 5B, and FIG. 6 show a first modification of the first embodiment, a second modification of the first embodiment, and a second embodiment. In the first modification of the first embodiment, the second modification of the first embodiment, and the second embodiment, in principle, the same members (or similar members) as the constituent members of the first embodiment are used. Explanation is given with the same reference numerals.

  In the first modification of the first embodiment shown in FIGS. 4A and 4B, a pair of first protrusions 46 are formed so that the first positioning portion 45 faces each other with the axis of the first tube portion 31 interposed therebetween. , 46 and first relief portions 48, 48 formed between the first protrusions 46, 46. Thereby, the workpiece | work 26 can be positioned with respect to the 1st cylinder part 31 in the direction where a pair of 1st projection parts 46 and 46 oppose. Further, when the work 26 is misaligned in the direction opposite to the first relief portions 48, 48 with respect to the support cylinder 30, the misalignment is absorbed by the first relief portions 48, 48.

  In the second modification of the first embodiment shown in FIGS. 5A and 5B, the second positioning portion 50 is formed on the outer periphery of the second cylinder portion 32 so as to face each other with the axis of the second cylinder portion 32 interposed therebetween. A pair of second protrusions 51, 51 and second relief parts 53, 53 formed between the second protrusions 51, 51 are provided. Thereby, the support cylinder 30 can be positioned with respect to the accommodation hole 19 of the upper housing 3 in a direction in which the pair of second protrusions 51 and 51 face each other. Further, when the work 26 is decentered in the direction in which the pair of second escape portions 53, 53 are opposed to the support cylinder 30, the misalignment is absorbed by the second escape portion 53.

  In the second embodiment shown in FIG. 6, the piston main body 11 of the piston 10 is inserted in the cylinder hole 6 of the lower housing 2 so as to be movable in the up and down direction. A piston rod 12 of the piston 10 protrudes upward from the piston body 11 of the piston 10. A housing hole 19 communicating with the cylinder hole 6 is formed in the lower housing 2. The support cylinder 30 is inserted into the accommodation hole 19 so as to be movable in the vertical direction. The clamp rod 20 is inserted into the tube hole 34 of the support tube 30. A T leg 77 formed at the lower end portion of the clamp rod 20 is attached to the T groove 76 formed in the upper portion of the piston rod 12. The clamp rod 20 and the piston 10 are arranged so that the axial center thereof substantially coincides with the axial center of the piston 10.

Second positioning portions 80 and 90 provided on the outer periphery of the second cylindrical portion 32 can be fitted to the inner peripheral surface of the receiving hole 19 via wedge members 82 and 92 as intermediate members. More specifically, a lower wedge space 81 and an upper wedge space 91 are formed between the accommodation hole 19 of the lower housing 2 and the outer peripheral portion of the second cylinder portion 32 of the support cylinder 30. The lower wedge space 81 is formed so as to narrow toward the upper side. An annular wedge member 82 is urged upward by the advance spring 36 toward the lower wedge space 81. A slit 82 a is formed in the peripheral wall of the wedge member 82. A pressing surface 84 is formed on the inner peripheral wall of the wedge member 82 so as to move away from the axial center as it goes upward. The pressing surface 84 is engaged with the second positioning portion 80 formed on the outer peripheral portion of the second cylinder portion 32 of the support cylinder 30. Further, a fitting surface 86 formed on the outer peripheral wall of the wedge member 82 faces the accommodation hole 19 so as to be fitted therein.
The upper wedge space 91 is formed so as to narrow toward the lower side. A wedge member 92 as an intermediate member is biased downward by an advancing spring 93 toward the upper wedge space 91. A slit 92 a is formed in the peripheral wall of the wedge member 92. A pressing surface 94 is formed on the inner peripheral wall of the wedge member 92 so as to move away from the axis as it goes downward. The pressing surface 94 is engaged with a second positioning portion 90 formed on the outer peripheral portion of the second cylinder portion 32 of the support cylinder 30. Further, the fitting surface 96 formed on the outer peripheral wall of the wedge member 92 faces the accommodation hole 19 of the lower housing 2 so as to be fitted.
The spring constant of the lower advance spring 36 is set larger than the spring constant of the upper advance spring 93.

The clamp device having the above-described configuration operates as follows.
In the unclamped state of FIG. 6, the pressure oil in the clamp chamber 14 is discharged and the pressure oil is supplied to the unclamp chamber 13. As a result, the piston 10 and the clamp rod 20 are moved to the raised position, and the advance spring 36 holds the support cylinder 30 in the raised position via the wedge member 82. At this time, the engagement member 27 is switched from the expanded diameter state to the contracted diameter state by the elastic force of the ring 40.

  In the unclamped state, when the work 26 is first lowered by some lifting means or its own weight and the hole 26a of the work 26 is externally fitted to the support cylinder 30, the inner peripheral wall of the hole 26a of the work 26 is first positioned. The first protrusion 46 of the portion 45 is fitted. Next, the lower surface 26 b of the workpiece 26 is received by the seating surface 3 a of the upper housing 3 and the seating detection hole 57 is closed. Subsequently, when pressurized air is supplied to the seating detection hole 57 in this state, the detection pressure increases. As a result, the seating state of the workpiece 26 is detected.

When the clamp device is switched from the unclamped state of FIG. 6 to the clamped state, the pressure oil in the unclamp chamber 13 is discharged and the pressure oil is supplied to the clamp chamber 14. Then, first, the piston 10 and the clamp rod 20 descend with respect to the support cylinder 30 held at the raised position by the advance spring 30. Next, the engagement member 27 is expanded from the reduced diameter state by the wedge surface 25 of the clamp rod 20, and the engagement member 27 engages with the inner peripheral surface of the hole 26 a of the workpiece 26. Thereby, the clamping device is switched to the clamping state.
At this time, when the advancing spring 36 presses the lower wedge member 82 upward, the lower wedge member 82 is expanded radially outward from the reduced diameter state. As a result, the pressing surface 84 of the lower wedge member 82 is wedge-engaged with the receiving surface 85 of the second cylinder portion 32 from below, and the fitting surface 86 of the lower wedge member 82 is inside the accommodation hole 19. It is fitted to the peripheral wall. Further, the advancing spring 93 presses the upper wedge member 92 downward, and the upper wedge member 92 is expanded radially outward from the reduced diameter state. Accordingly, the pressing surface 94 of the upper wedge member 92 is wedge-engaged with the receiving surface 95 of the second cylindrical portion 32 from above, and the fitting surface 96 of the upper wedge member 92 is formed on the inner peripheral wall of the accommodation hole 19. Mated. As a result, the support cylinder 30 is positioned in the radial direction below the accommodation hole 19 via the wedge member (intermediate member) 82, and is located radially above the accommodation hole 19 via the wedge member (intermediate member) 92. Is positioned.

  When the clamp device is switched from the clamped state to the unclamped state of FIG. 6, the pressure oil in the clamp chamber 14 may be discharged and the pressure oil supplied to the unclamp chamber 13. As a result, the clamping device is switched to the unclamped state by a procedure almost opposite to the above-described clamping operation.

The above embodiment has the following advantages.
The second positioning portions 80, 90 of the second cylinder portion 32 are fitted into the receiving holes 19 of the lower housing 2 via the wedge members 82, 92, whereby the support cylinder 30 is radiused with respect to the lower housing 2. Position in the direction. Further, the positioning portion 45 of the support cylinder 30 is fitted into the hole 26 a of the work 26 with a first fitting gap 47, thereby positioning the work 26 in the radial direction with respect to the support cylinder 30. Thereby, the above-described clamping device can position the workpiece 26 in the radial direction with respect to the housing 1.

The above embodiment can be modified as follows.
Instead of the illustrated posture, the clamping device may be placed upside down, horizontally, or obliquely.
The driving means 5 may be a single-acting cylinder instead of a double-acting cylinder.
Further, the driving means may be a pneumatic cylinder or an electric actuator instead of the illustrated hydraulic cylinder 5.
Instead of configuring the piston 10 and the clamp rod 20 separately, the piston and the clamp rod may be formed integrally or fixed integrally with a screw or the like.
The object to be clamped to which the present invention is applied may be a work pallet or a mold instead of the exemplified work 26.
Although three wedge surfaces 25 and engagement members 27 are arranged at predetermined intervals in the circumferential direction, one, two, or four or more may be arranged.
The top wall of the support cylinder 30 may be omitted.
The urging means 38 may be constituted by a fluid pressure cylinder such as a hydraulic cylinder instead of the exemplified advance spring 36 and the spring receiver 37.
The protrusions 46 and 51 may have a structure formed separately from the support cylinder instead of the structure formed integrally with the support cylinder 30. The material of the protrusion is not limited to metals such as iron, non-ferrous metals, and special alloys, but may be synthetic resin or rubber.
As illustrated, the intermediate member is not provided with the upper wedge member 82 and the lower wedge member 92, but only one of the upper wedge member 82 and the lower wedge member 92. You may make it provide.
The lower wedge space 81 may be configured to be narrowed toward the lower side instead of being configured to narrow toward the upper side. Further, the upper wedge space 91 may be configured to be narrowed toward the upper side instead of the configuration to be narrowed toward the lower side.
The pressure fluid supplied to the detection mechanism 55 may be another liquid such as another gas or pressure oil instead of the illustrated pressurized air.
In addition, it is needless to say that various modifications can be made within a range that can be assumed by those skilled in the art.

DESCRIPTION OF SYMBOLS 1: Housing, 5: Drive means, 19: Accommodating hole, 20: Clamp rod, 25: Wedge surface (wedge part), 26: Workpiece (clamp object), 26a: Hole, 27: Engagement member, 30: Support Cylinder: 31: first cylinder part; 32: second cylinder part; 38: biasing means; 45: first positioning part; 46: first projection part; 48: first relief part; 51: second protrusion, 53: second relief, 80: second positioning portion, 82: wedge member (intermediate member), 90: second positioning portion, 92 wedge member (intermediate member).

Claims (6)

Drive means (5) disposed on the proximal side of the housing (1);
A first cylinder portion (31) inserted into the hole (26a) of the clamp object (26) and a second cylinder portion inserted into the housing hole (19) of the housing (1) so as to be movable in the axial direction. A support tube (30) having (32);
A clamp rod (20) inserted into the support tube (30) and coupled to the drive means (5);
An engagement member (27) supported on the cylinder wall of the first cylinder part (31) so as to be movable in the radial direction, wherein a wedge part (25) provided on the distal end side of the clamp rod (20) has a distal end An engagement member (27) engaged from the side;
Urging means (38) for urging the support tube (30) toward the distal end side with a predetermined force;
A first positioning portion (45) provided on an outer periphery of the first cylindrical portion (31) and capable of being fitted to an inner peripheral surface of the hole (26a);
A second positioning portion (50, 80, 90) provided on the outer periphery of the second cylinder portion (32) and capable of being fitted to the inner peripheral surface of the accommodation hole (19).
A clamping device with a positioning function. The clamping device according to claim 1, wherein
The first positioning portion (45) is formed continuously in the circumferential direction on the first tube portion (31).
A clamping device with a positioning function. The clamping device according to claim 1, wherein
The first positioning portion (45) includes a pair of first protrusions (46) (46) formed to face each other with the axis of the first tube portion (31) interposed therebetween, and the first protrusions. (46) First relief portions (48) (48) formed between (46),
A clamping device with a positioning function. The clamping device according to claim 1, wherein
The second positioning portion (50) is continuously formed in the circumferential direction on the second cylindrical portion (32).
A clamping device with a positioning function. The clamping device according to claim 1, wherein
The second positioning portion (50) includes a pair of second protrusions (51) (51) formed to face each other with the axis of the second cylinder portion (32) interposed therebetween, and these second protrusions. (51) The second relief part (53) (53) formed between (51),
A clamping device with a positioning function. The clamping device according to claim 1, wherein
The second positioning portion (80, 90) can be fitted to the inner peripheral surface of the accommodation hole (19) via an intermediate member (82, 92).
A clamping device with a positioning function.

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