JPH11254263A - Clamp device with operation check mechanism - Google Patents

Abstract

(57) [Problem] To provide a clamp device with an operation confirmation mechanism for directly detecting a displacement of a clamp control means as a mechanical displacement. SOLUTION: Clamp control means (9, 10) for controlling operation of clamp means (4, 6) for clamping a work to a work mounting portion formed on a plane orthogonal to the rotation axis of a base 11 in a clamping direction. And an operating position where the operating end abuts one end of the clamp control means to perform an unclamping operation against the urging, and a fixed position where the operating end is separated from the one end outside the base. And an operation confirming means for detecting a state of the clamp means by detecting a displacement position of the other end of the clamp control means.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clamp device with an operation check mechanism, which clamps a work on a base rotatable around a rotation axis and can check the clamped state.

[0002]

2. Description of the Related Art Conventionally, various devices have been developed which carry a workpiece (work) such as a cylinder head or a crankcase by a conveyor or the like, and perform machining by clamping at a predetermined position. The essential requirements of these clamp devices are to clamp the work accurately at a predetermined position, and to rotate the clamp device appropriately after the clamp to fix the work at a desired tool position. Therefore, a clamping means and a work rotating means are required. The device shown in FIG. 2 which was born in the process of developing the clamp device is one of them.

A fixture 53 for mounting the work 2 is disposed on an index table 51 which is rotatable around a rotation axis 70 by hydraulic pressure or a motor. The work 2 is positioned on the upper surface of the mount 53. Positioning pin 5
A clamp drive rod 56 for controlling the operation of a clamp arm 54 for clamping the workpiece 5 and the work 2 is arranged, and these pins and rods are configured to be vertically movable by cylinders 57 and 58 driven by hydraulic pressure.

The hydraulic pressure for driving the cylinder is controlled by valve means 61 and 62 located below via a rotary valve 59 arranged at the center. When the positioning pin 55 is lifted, the oil supplied from the valve means 61 is supplied to the cylinder 57 via the rotary joint 67 and is supplied to the dummy cylinder 60.
When the drive shaft tip 60a of the dummy cylinder 60 switches the limit switch 64 to discharge the oil from the cylinder 57 and the dummy cylinder 60, the drive shaft tip 60a of the dummy cylinder 60 is switched to the limit switch. By closing 63, it is determined that positioning is released.

[0005] When the oil supplied from the valve means 62 rises the crank drive rod 56, it is supplied to the cylinder 58 via the rotary joint 68, and the hydraulic pressure acts on the pressure switch 66 to determine that the clamping is completed. Valve means 6
2 is switched and when the oil is discharged from the cylinder 58, the pressure switch 65 is closed to determine that the clamp is released.

[0006]

However, according to the above-mentioned technology, the use of the rotary valve not only has a problem that the apparatus is liable to be complicated, but also causes a failure of the rotary joint even if oil is supplied by the valve means. In some cases, even if the dummy cylinder 60 or the pressure switch operates due to clogging of the hydraulic path, the hydraulic pressure does not act on the cylinders 57 and 58, in which case a completion display different from the actual one is displayed, and if machining is performed as it is, There is a possibility that the work, the clamp device, the processing device, etc. will be greatly damaged.

In view of the above circumstances, an object of the present invention is to provide a clamp device with an operation confirmation mechanism that can more reliably detect the operation state of the clamp means while preventing the device from becoming complicated. .

[0008]

Means for Solving the Problems In order to solve such problems, the invention described in claim 1 is proposed. The feature of the present invention is that (1) mechanically controlling a clamp means for clamping a work to a work mounting portion of a base by a displacement of a clamp control means, and urging the clamp control means in a clamping direction, A point where an unlocked state is constituted by an actuator disposed outside the table against the bias. (2) The operating end of the actuator is in contact with one end of the clamp control means in the unlocked state, but the operating end is separated from the one end in the locked state. (3) The detection of the unlocked state and the locked state is performed by detecting the displacement position of the other end of the clamp control means by the operation check means arranged outside the base.

Therefore, according to the present invention, when the actuator is at a fixed position, the clamp means is in a clamped state by the displacement of the clamp control means by the urging force of the urging means, and is in the clamped state by the urging force of the urging means. Excellent operation stability and reliability. In addition, since the actuator is disposed outside the base and the operating end of the actuator is separated from one end of the clamp control means at a fixed position, the actuator does not hinder the rotation of the base. Further, since the actuator disposed outside the base is operated when performing the unclamping operation, the actuator can be disposed separately from the rotatable base, and the apparatus can be prevented from becoming complicated. In particular, in the present invention, the operation state of the clamp means is mechanically reflected on the displacement of the clamp control means, and the operation confirmation means detects the displacement position of the other end of the clamp control means, thereby enabling the operation of the clamp means. The state can be accurately detected.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to an embodiment shown in the drawings. However, unless otherwise specified, dimensions, materials, shapes, relative positions, and the like of the components described in this embodiment are not intended to limit the scope of the present invention, but are merely illustrative examples. Not just.

FIG. 1 is a configuration diagram of a clamp device according to an embodiment of the present invention. An attachment 3 for mounting the workpiece 2 on the index table 11 configured to be rotatable around a rotation axis 26 by hydraulic pressure or a motor is provided.
A clamp arm 4 pivotally supported by a member (not shown) is rotatably disposed on the upper surface of the attachment 3. still,
The index table 11 and the attachment 3 constitute a base of the present invention, and a work attachment portion is formed on the upper surface of the attachment 3.

A positioning pin 5 for positioning the work 2 and a clamp drive rod 6 for controlling the operation of the clamp arm 4 are provided so as to be vertically movable, and can be displaced in a direction perpendicular to the direction of the rotation axis 26. A positioning pin driving bar 7 and a clamp driving bar 9 are provided.

The positioning pin driving bar 7 has right and left ends slidably protruding from an opening formed in the outer periphery of the fixture 3, and a cam plate 8 having a cam groove 28 is fixed inside the fixture 3, A pin 5a implanted in the positioning pin 5 is slidably fitted in the cam groove 28, and a coil spring 27 is wound around the left side of the cam plate 8 to apply a biasing force to the right. A cam portion 10 having a larger diameter than the drive bar 9 is provided on the right hand of the clamp drive bar 9, and both right and left ends slidably protrude from opening holes formed in the outer periphery of the fixture 3. 10 is provided with a cam surface 10a,
The lower end of the clamp drive rod 6 abuts the coil spring 29 (biasing means) on the left side of the cam portion 10 to apply a rightward biasing force.

The clamp arm 4 and the clamp drive rod 6 constitute a clamp means,
The clamp drive bar 9 constitutes a clamp control means for controlling the clamp operation and the unclamping operation of the clamp means. A bar driving means 13 is disposed on the right side of the outer side of the attachment 3. The bar driving means 13 includes a driving actuator 14 facing the right end of the positioning pin driving bar 7, and the cam section 10. A driving actuator 15 is disposed so as to face the right end of the driving actuator 15. Incidentally, the driving actuator 15 constitutes the actuator of the present invention.

The drive shaft tips 14a and 15a of these drive actuators take positions away from the right end of the positioning pin drive bar 7 and the right end of the cam portion 10 when the drive actuator does not operate. When the drive actuator is activated, the tip 1
4a and 15a move leftward to abut the right end of the positioning pin drive bar 7 and the right end of the cam portion 10, respectively, and move the positioning pin drive bar 7 and the cam portion 10 leftward against the respective urging forces. Then, the positioning pin 5 of the work 2 is lowered to release the positioning, and the clamp arm 4 enters an unclamped state. When each of the driving actuators is in a clamped state at a fixed position, the right end of the driving shaft 1
The limit switches 23 and 25 are closed by 4b and 15b, and in the unclamped state in which each drive actuator is operated, the limit switches 22 and 2 are closed.
4 is closed and displayed by an electric display means (not shown).

A checking means 12 for checking the operating state of the positioning pin 5 and the clamp arm 4 is provided on the left side of the outside of the fixture 3. The checking means 12 includes the positioning pin driving bar 7. And a confirmation actuator 17 facing the left end of the clamp drive bar 9.

The tip 16 of these confirmation actuators
Reference numerals a and 17a denote a distance from the left end of the positioning pin driving bar 7 in a state in which the work 2 is positioned and the left end of the clamp driving bar 9 in a state in which the work 2 is clamped when the confirmation actuator does not operate. Position.

On the other hand, the drive actuators 14 and 15 of the bar drive means 13 disposed on the right side outside the fixture 3 operate to release the positioning of the work 2, and the clamp arm 4 enters the unclamped state. At this time, even if the confirmation actuators 16 and 17 are operated, the confirmation actuators 16 and 17 hold their fixed positions because they contact the left end of the positioning pin drive bar 7 and the left end of the clamp drive bar 9.

When the actuators 14 and 15 are returned to their home positions, the respective drive shafts move rightward, the positioning pin driving bar 7 moves rightward by the urging force of the coil spring 27, and the positioning pin 5 positions the workpiece 2. Then, the clamp drive bar 9 moves rightward by the urging force of the coil spring 29 to raise the clamp drive rod 6 and the clamp arm 4 clamps the work 2.

In this state, the drive shafts of the drive actuators 14 and 15 are located apart from the right end of the pin drive bar 7 and the right end of the cam portion 10. In this process, if the confirmation actuators 16 and 17 are driven, the leading ends 16a and 17a of the drive shafts are respectively located at the left end of the positioning pin drive bar 7 and the clamp drive bar 9
Follows and goes right while abutting the left edge of.

Here, the operation check will be described. When the drive shaft of the confirmation actuator is in the fixed position even when the confirmation actuator is operated, the drive shaft left ends 16b and 17
The limit switches 18 and 20 are closed by b, and the position release and unclamping state of the work are displayed by an electric display means (not shown). Further, the positioning pins 5 move up with the return of the home positions of the driving actuators 14 and 15 to position the work 2, and the clamp arm
Are clamped, the confirmation actuators 16, 1
Since each drive shaft 7 moves to the right, the limit switch 19
And 21 are closed and the clamped state is displayed. The confirmation actuator 17, the limit switches 20, 21
Constitutes the operation check means of the present invention, but the operation check means is not limited to this, and a non-contact type sensor capable of detecting the displacement of the clamp drive bar may be used, for example.

Thereafter, the confirmation actuators 16 and 1
7 stops, the drive shaft moves to the left, and the pin drive bar 7
And the clamp drive bar 9 returns to a fixed position separated from the left end. In this state, the actuators 14, 1
Since the tip of each of the drive shafts 5, 16, and 17 is at a position separated from the fixture 3, the fixture 3 can rotate the workpiece to a predetermined processing position.

As described above, in this embodiment, when the actuator is at the fixed position, the clamp control means by the urging force of the urging means is at the clamp position. Therefore, the work can be clamped with a constant urging force by the urging means, so that the clamping stability is excellent and the reliability is high.

Also, the distal end of the actuator driving shaft of the bar driving means and the operation checking means, which is disposed at the outer periphery of the fixture, is separated from the distal end of the positioning pin driving bar or the clamp control means which faces the distal end. Therefore, the two members do not interfere with each other when the fixture is rotated.

Further, since the actuators are operated only when they are in the unclamped state, the actuators can be arranged separately from the rotatable fixture, so that the device can be prevented from becoming complicated.

Further, since the displacement check position of the clamp control means, which mechanically reflects the operation state of the clamp means, is detected by the operation check means, if an operation failure occurs, the clamp control control means stops at that position, and The follow-up operation confirming means also does not reach the final operation end, and the limit switch for confirmation does not operate, so that a defect can be found, and the reliability of the operation confirmation is high.

Further, since no hydraulic pressure is used for the work clamp, no rotary valve or piping is required, oil leakage is prevented, machining chips do not clog the piping or valve, and the structure is simplified. The chip discharge performance is improved, and the maintainability is improved. In the present embodiment, the case of processing engine parts such as a cylinder head and a crankcase has been described as an example, but it is needless to say that the present invention can be applied to other devices that rotate while clamping a work.

[0028]

As described above, according to the present invention, it is easy to detect the unclamp state of a workpiece, the reliability is high, and it is possible to prevent mechanical damage, defective product production, and tool damage due to erroneous detection.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a clamp device according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of a clamp device developed before the embodiment of FIG. 1;

[Explanation of symbols]

 6 Clamp drive rod 9 Clamp drive bar 10 Cam part 11 Index table 15 Actuator for drive 17 Actuator for confirmation 29 Coil spring

Claims (1)

[Claims] 1. A clamping device with an operation confirmation mechanism configured to clamp a work on a base rotatable around a rotation axis and to check a clamped state of the work, wherein the clamp is provided on a plane orthogonal to the rotation axis of the base. A formed work mounting portion, a clamp means for clamping the work to the work mounting portion, and a displacement provided in the base in a direction orthogonal to the direction of the rotation axis, the displacement being mechanically applied to the clamp means. A clamp control means for controlling the clamp operation and the unclamping operation of the clamp means by transmitting the force to the clamp means; an urging means for urging the clamp control means in a clamp direction; An operating position where the unclamping operation is performed against the bias of the biasing means by abutting against one end of the clamp control means, and the operating end is separated from the one end; An actuator provided so as to be switchable between a fixed position and an operation confirming unit disposed outside the base and detecting a displacement position of the other end of the clamp control unit to detect a state of the clamp unit. A clamp device with an operation check mechanism.