JPH0614959Y2 - Emergency stop control device for press automation equipment - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention is provided in a press automation device that is a combination of a press machine and a material supply device, and in the event of an abnormality on the material supply device side, an emergency stop on the press machine side The present invention relates to an emergency stop control device for a press automation device that outputs an emergency stop signal to a circuit.

[Prior Art] In a press automation device that is a combination of a press machine and a material supply device, the power supply on the material supply device side is cut off, or an abnormality occurs in the control circuit on the material supply device side, and normal control cannot be performed. When this happens, an emergency stop signal must be output to the control circuit on the press machine side.

FIG. 3 shows an example of such a conventional emergency stop control device. In this figure, 1 is a control circuit of the material supply device, 2
Is a control circuit of the press machine, and 3 is an emergency stop circuit incorporated in the control circuit 2.

The emergency stop circuit 3 has a pair of input terminals 3A and 3B for inputting an emergency stop signal. Under normal conditions, these input terminals 3A and 3B are held in a conductive (short-circuited) state, By interrupting the electrical connection in an emergency, the press machine can be stopped in an emergency.

A relay contact 4 for outputting an emergency stop signal is provided between the input terminals 3A and 3B and signal lines 5A and 5B.
Connected through. This relay contact 4 is incorporated in the material supply device side control circuit 1, and when power is supplied to the material supply device and the control circuit 1 operates normally, a relay coil (not shown) is energized to close it. When the power is turned off or the control circuit 1 does not operate normally, the relay coil is de-energized and opened. Therefore, when the relay contact 4 is opened, the emergency stop signal is input to the emergency stop circuit 3.

[Problems to be solved by the invention] By the way, during normal operation, a press machine performs press processing while supplying a material with the material supply apparatus. However, due to the circumstances of the factory, the material supply apparatus is used. There is a case where it is desired to use the press machine alone without doing so. In such a case, in the above stop control device, the emergency stop circuit 3
In order to keep the two input terminals 3A and 3B in a conductive state, it was necessary to turn on the power of the material supply device to make it controllable. Therefore, the material feeder was to be operated in a dangerous condition that could malfunction due to false signals.

[Means for Solving the Problem] The emergency stop control device of the present invention is made in consideration of such a situation, and is provided between a pair of emergency stop signal input terminals of the emergency stop circuit on the press machine side. Connected relay contacts that close when the material feeder is in a normal operating state and open when it is out of control, and a changeover switch having two types of contacts that open when one of them closes And one of the contacts of the changeover switch is used as a contact for supplying and shutting off power to the material supply device, and the other contact is connected in parallel with the relay contact between the pair of emergency stop signal input terminals. It is characterized by being connected to.

[Operation] In the apparatus having the above-mentioned configuration, when the changeover switch is operated to one side, one contact closes to enable the supply of power to the material supply apparatus and the other contact opens. Therefore, by supplying power, if the material supply device side is normal, the relay contact is closed and the two input terminals of the press machine side emergency stop circuit are brought into conduction. Also, if the material supply device side is abnormal, the relay contact opens and the conduction between both input terminals of the emergency stop circuit is cut off. Then, the emergency stop circuit operates and the press machine stops.

When the press machine is used alone, the changeover switch is operated to the other side. Then, one of the contacts is opened to make it impossible to supply power to the material supply device, and the other contact is closed to bring the two input terminals of the emergency stop circuit of the press machine into conduction. Therefore, the press machine can be operated independently without making the material supply device side controllable.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

In FIGS. 1 and 2, 1 is a control circuit of the material supply device, 2 is a control circuit of the press machine, 3 is an emergency stop circuit,
3A and 3B are emergency stop signal input terminals, 4 is a relay contact, and 5A and 5B are signal lines. These are the same as those of the conventional example shown in FIG.

The difference is that a change-over switch 8 having two kinds of contacts 6 and 7 which are opened when one of them is closed is provided, and one contact 6 of the change-over switch 8 is used for supplying and shutting off power to a material supply device. Used as a contact, and the other contact 7
Is connected in parallel with the relay contact 4 between the emergency stop cutoff input terminals 3A and 3B. In the figure, 9, 1
What is indicated by 0 is a power bus.

In this device, the changeover switch 8 is used for normal operation.
Are operated as shown in FIG. Then, the contact 6 is closed and power is supplied to the material supply device. Then, in a normal state, the relay contact 4 is closed, and the emergency stop signal input terminal 3A,
3B is electrically connected.

In this state, if a power supply abnormality or control abnormality occurs on the material supply device side or a connection failure occurs on the signal lines 5A and 5B, the conduction between the input terminals 3A and 3B is cut off. Then, the emergency stop circuit 3 operates and the press machine stops.

When the changeover switch 8 is changed over as shown in FIG. 2, the contact 7 is closed so that the emergency stop signal input terminals 3A and 3B are brought into conduction even if the relay contact 4 is not operating. In addition, the power supply to the material supply device is shut off by opening the contact 6. Therefore, it is possible to operate the press machine alone without operating the material supply device side at all.

If a power switch is used as the change-over switch 8 and the b contact (break contact) of the power switch is used as the contact 7, it is not necessary to add a special switch.

[Effects of the Invention] As described above, in the emergency stop control device of the present invention, by operating the changeover switch to one side, it is possible to ensure a state in which an emergency stop signal can be output during normal operation as in the conventional case. it can.

Further, if the changeover switch is operated to the other side, it becomes impossible to supply power to the material supply device and the emergency stop signal input terminals of the emergency stop circuit are electrically connected. Therefore, the press machine can be used alone without operating the material supply device. Therefore, the press machine is not operated in a dangerous state where the material supply device may malfunction, and safety is improved.

[Brief description of drawings]

FIGS. 1 and 2 show an embodiment of the present invention. FIG. 1 is a diagram showing a state in which a changeover switch is operated to one side to supply power to a material supply device, and FIG. FIG. 3 is a diagram showing a state in which the power is cut off by operating the changeover switch to the other side, and FIG. 3 is a diagram of a conventional emergency stop control device. 1 ... Control circuit of material supply device, 2 ... Control circuit of press machine, 3 ... Emergency stop circuit of press machine side, 3A,
3B ... Emergency stop signal input terminal, 4 ... Relay contact, 5
A, 5B ... Signal line, 6, 7 ... Contact point, 8 ... Changeover switch, 9, 10 ... Power supply busbar.

Claims (1)

[Scope of utility model registration request] 1. A press automation device, which is a combination of a press machine and a material supply device, is equipped with an emergency stop signal input terminal for a pair of emergency stop signal input terminals of the press machine side emergency stop circuit when an abnormality occurs on the material supply device side. A stop contact is output, and a relay contact is connected between the pair of emergency stop signal input terminals, which is closed when the material supply device is in a normal operating state and is opened when the material supply device is out of control. An emergency stop control device for a press automation device is provided with a changeover switch having two types of contacts, one of which is opened when the other is closed, and one of the contacts of the changeover switch is used for supplying and shutting off power to a material supply device. A press automation device which is used as a contact, and the other contact is connected between the pair of emergency stop signal input terminals in a parallel relationship with the relay contact. Emergency stop control device.