JPS632277Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an operation confirmation device for a movable cart such as a jig cart, which is provided with a work clamp member and other operating members operated by a fluid actuator on the cart.

Conventionally, for example, a jig trolley is made to be able to reciprocate between a workpiece set position and a workpiece processing position, and when the trolley is moved to the workpiece set position, fluid is supplied to a fluid actuator to cause a clamping member to clamp the workpiece. There is a known system in which the operation is confirmed by a detector and the next operation such as the movement of the trolley to the workpiece processing position is performed by sequence control. Generally, it consists of an electric switch such as a limit switch that comes in contact with the trolley. According to this, it is necessary to wire an electric cord connected to the switch between the trolley and an external control device, and when the trolley is moved, The disadvantage is that the cord is likely to be routed and damaged.

The object of the present invention is to provide a device that eliminates such inconveniences, and is provided with a clamp member or other actuating member 3, which is actuated by a fluid actuator 2, on a movable cart 1. 3, the operating state of the actuator 2 is confirmed by a detector 4, and the movement of the trolley 1 and other subsequent operations are performed by sequence control. The actuator 2 is interposed in a branched signal circuit 6.
The detector 4 is equipped with an on-off valve 7 mechanically interlocked with the detector 4.
is composed of a pressure detector installed outside the trolley 1,
A feature is that the detector 4 can be freely connected to and disconnected from the output end of the signal circuit 6. In the illustration, the trolley 1 is
A jig trolley is reciprocated between the workpiece setting position and the workpiece machining position, and 8 in the figure shows the positioning hole 9 of the trolley 1 when it is moved to the workpiece setting position.
The pin 8 is a positioning pin that is moved up and down by a cylinder 10 and fitted in a detachable manner.The pin 8 is also used as an air joint connected to a factory air source, which is a fluid source, and air is supplied to the fluid circuit 5 through the air joint. I tried to supply it.

The fluid circuit 5 includes a pneumatically actuated switching valve 11 that switchably supplies air to the fluid actuator 2 configured with an air cylinder, and a pneumatically actuated first and second control valve that switches and controls the switching valve 11. Valve 1
2 and 13, the switching valve 11 can be switched via the actuator 2 between a first position in which the actuating member 3, for example a clamp member, is opened and a second position in which it is closed. 1 second control valve 1
2 and 13 are external first and second solenoid valves 14 and 15, respectively.
The switching valve 1 is opened by the action of air pressure when the first control valve 12 is opened.
1 is switched to the second position and the clamping member 3
When the second control valve 13 is opened, the air pressure acting on the switching valve 11 leaks to the atmosphere and moves the switching valve 11 to the first position. The workpiece w is unclamped by switching. Here, the second solenoid valve 15 is disposed on the workpiece machining position side, and when the cart 1 moves to the workpiece machining position, the second solenoid valve 15
It is connected to the control valve 13 and is opened after machining of the work w is completed.

The on-off valve 7 includes a first on-off valve 7-1 and a second on-off valve that are opened by a dog 2b attached to the piston rod 2a of the fluid actuator 2 when the actuating member 3 is unclamped and when the clamp is activated. 7-2
Correspondingly, the signal circuit 6 and the detector 4 were also provided in one pair, the first and second.

To explain this in more detail, a first detector 4-1 and a second detector 4-1 each consisting of a pressure detector are installed outside the trolley 1.
2, and when the trolley 1 is returned to the work setting position, the first detector 4-1 is connected to the first on-off valve 7-.
The second detector 4-2 is connected to the output end of the first signal circuit 6-1 on the truck 1 connected to the truck 1 through the first joint 16-1, and the second detector 4-2 is connected to the truck 1 connected to the second on-off valve 7-2. The output ends of the second signal circuits 6-2 on 1 can be freely connected to and disconnected from each other via second joints 16-2, and here the second joints 16-2
is raised and lowered by the cylinder 17 between an upper connection position and a lower disconnection position together with a third joint 16-3 that connects the first control valve 12 and the second solenoid valve 14 in a freely disconnectable and disconnectable manner. Joint 16-1
is also raised and lowered in the same way by another cylinder.

Here, a check valve 1 is provided at the output end of the second signal circuit 6-2 to prevent air from flowing out from the circuit 6-2.
8 is provided, and when the second joint 16-2 is raised and this is fitted to the output end, the check valve 18 is pushed up by the operator 18a installed in the joint 16-2 and opened. Also, the first joint 1 is connected to the output terminal of the first signal circuit 6-1.
A check valve 19 which is opened by an operator similar to that described above, which is installed upright at 6-1, is provided. Furthermore, a check valve 20 is interposed in the fluid circuit 5 to prevent air from flowing out from the positioning hole 9 at the upstream end thereof, and a check valve 20 is provided in the fluid circuit 5 to prevent air from flowing out from the positioning hole 9 at the upstream end thereof. A check valve 21 is installed to prevent air from flowing out, and when the pin 8 is fitted into the hole 9, the check valve 21 is opened by being pushed by an operator 21a vertically installed in the hole 9. Air is supplied from the pin 8 to the fluid circuit 5 via the check valve 21 and the check valve 20.

Note that a positioning pin similar to the above positioning pin 8 that fits into the positioning hole 9 is provided at the workpiece processing position, and air is supplied to the fluid circuit 5 through the pin to open the second electromagnetic valve 15. As mentioned above, the second
When the switching valve 11 is switched to the first position via the control valve 13, air is supplied to the fluid actuator 2 from the fluid circuit 5, so that the actuating member 3 is given a clamp release action.

In the drawing, 16-4 indicates a fourth joint that connects the second control valve 13 and the second solenoid valve 15 in a freely disconnectable and disconnectable manner, and like the second solenoid valve 15, the joint 16-4 is located on the workpiece processing position side. established in

Next, to explain the operation, when the trolley 1 is moved to the work set position, the positioning pin 8 is first moved upward to position the trolley 1 and supply air to the fluid circuit 5. Then, by upward movement of each joint 16, the first control valve 12 of the first solenoid valve 14
The first and second detectors 4-1 and 4-2 are connected to the first and second signal circuits 6-1 and 6-2.

In this case, since the actuating member 3 is already in the unclamped state and the first on-off valve 7-1 is opened, the first detector is activated by the signal pressure via the first signal circuit 6-1. 4-1 is activated, it is confirmed that the trolley 1 moves to the work set position and that the actuating member 3 is in the unclamped state, and the detector 4-1
For example, the loading of the workpiece and the opening of the first electromagnetic valve 14 after loading are given by a command signal from , the switching valve 11 is switched to the second position as described above, and the clamping operation of the actuating member 3 is given. When this clamping operation is completed, the second on-off valve 7-2 is opened, a signal pressure is applied to the second detector 4-2, and a command signal for the next stage is generated from the second detector 4-2. Then, the carriage 1 is moved to a workpiece processing position by, for example, a carriage moving device (not shown).

At this time, the positioning pin 8 and the first to third joints 16-1, 16-2, 16-3 are detached from the trolley 1 by the lowering, but the positioning hole 9 and the second
The outflow of air from the output end of the signal circuit 6-2 is prevented by the check valves 18 and 20, and the air is confined in the fluid circuit 5, and the first control valve 12 is closed. Since the operating air of the switching valve 11 is confined between the switching valve 11 and the second control valve 13 that is in the state, the switching valve 11 is held in the second position, and the operating member 3 is held in the clamped state, and the bogie 1
The workpiece w does not fall off or shift its position during the movement.

Incidentally, a plurality of actuating members 3 are mounted on the cart 1, and in order to sequentially actuate them, the actuating member 3 of the next stage is activated by a command signal from the detector 4 upon completion of the actuating member 3 of the previous stage. The present invention can be similarly applied to the case where .

As described above, according to the present invention, the detector 4 consisting of an externally arranged pressure detector is connectably connected to the signal circuit 6 in which the on-off valve 7 mechanically interlocked with the fluid actuator 2 is interposed. This allows the operation of the actuating member 3 to be confirmed using fluid pressure, and there is no need to connect an electric cord to the trolley 1 as in the past, resulting in the inconvenience of damage to the electric cord or malfunction due to this. This has the effect of ensuring reliable operation without causing any problems.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of an example of the present device, and FIG. 2 is a partially cutaway side view showing the structure of the joint portion. 1... Truck, 2... Fluid actuator, 3...
...Operating member, 4...Detector, 5...Fluid circuit, 6
...Signal circuit, 7...Opening/closing valve.

Claims (1)

[Scope of utility model registration request] A fluid actuator 2 is mounted on a movable trolley 1.
The system is equipped with a clamp member or other actuating member 3 that is actuated, and the actuating state of the actuating member 3 is confirmed by a detector 4, and the movement of the trolley 1 and other subsequent operations are performed by sequence control. , an on-off valve 7 is provided on the truck 1 and mechanically interlocked with the actuator 2 through a signal circuit 6 branched from a fluid circuit 5 that operates the actuator 2, and the detector 4 is connected to the outside of the truck 1. An operation confirmation device for a movable trolley, characterized in that the detector 4 is configured to include a pressure detector provided at the output end of the signal circuit 6 and can be freely connected or disconnected from the output end of the signal circuit 6.