JPH046480B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a simulation device for a press control circuit that controls a press machine. For example, the present invention relates to a device that simulates what happens to a press machine when a certain line and a certain line forming a press control circuit are short-circuited.

[Background technology and its problems]

A press machine is equipped with an abnormality detection and stop circuit that detects an abnormality and stops the press machine when an abnormality occurs in a press control circuit that controls the press machine. When the press machine stops due to the operation of this abnormality detection and stop circuit, in order to restart it, it is first necessary to investigate the cause of the failure.

However, since the operator cannot immediately find the location of the failure, he or she must sequentially inspect the wiring of each part of the press control circuit to find the location of the failure. Such work is time consuming and is also a factor that reduces the operating rate of the press machine.

By the way, depending on the manner in which the press machine stops, it is possible to narrow down the failure range to some extent, but this requires experience and intuition, and is not something that anyone can do easily.

[Purpose of the invention]

SUMMARY OF THE INVENTION In view of the current situation, it is an object of the present invention to provide a simulation device for a press control circuit that allows anyone to easily and quickly determine the cause of a failure when a press machine stops.

[Means and actions for solving problems]

Therefore, in the present invention, when the circuit configuration of the press control circuit changes, for example when a certain line is short-circuited, what kind of phenomenon will occur in the press machine is known by simulation in advance. The above purpose can be achieved by setting the above.

Specifically, there is a press control circuit that controls the drive of the press machine, and an abnormality detection and stop circuit that monitors this press control circuit and issues a stop signal to stop the press machine when an abnormality occurs in the press control circuit. , a failure command means for instructing to change the circuit configuration of the press control circuit to a preset failure state; and a simulator for changing the circuit configuration of the press control circuit in response to the contents of the command from the failure command means. a sequencer; a signal discriminator for discriminating a stop signal when a stop signal is issued from the abnormality detection and stop circuit based on a change in the circuit configuration of the press control circuit; and a display of a discrimination result of the signal discriminator. It is characterized by comprising a display means.

〔Example〕

FIG. 1 is a block diagram of the simulation device of this embodiment. In the figure, 1 is a command processing device composed of a computer, etc., 2 is a simulation sequencer, and 3 is a press control circuit, which detects when the press control circuit 3 is in an abnormal state. It is equipped with an abnormality detection and stop circuit 4 that stops the press machine.

The command processing device 1 includes a command section 11 as a failure command means that gives various operation commands to the simulation sequencer 2, and sends signals based on commands from the command section 11 to the simulation sequencer 2. It also includes a signal processing section 12 as a signal discriminating means for discriminating a stop signal given from the simulation sequencer 2, and a printer 13 as a display means for printing out the discrimination results of the signal processing section 12. Command unit 11
The operation command from is a command to change the circuit configuration of the press control circuit 3 to a preset failure state, for example, to short-circuit two or more specified wires forming the press control circuit 3. In addition to failure commands, there are operation and recovery commands for the press control circuit 3, etc.

The simulation sequencer 2 is wired in advance so that the circuit configuration of the press control circuit 3 can be changed in response to various failure signals from the command processing device 1. For example, if the failure signal is a short-circuit signal for two wires, the two wires designated by the press control circuit 3 are short-circuited to each other. In addition, the press control circuit 3 is set to the operating state in response to the operation signal from the command processing device 1, and the press control circuit 3 is set to the return state in response to the return signal, and the abnormality detection and stop circuit 4 sets the press control circuit 3 to the operating state. A signal is sent to the command processing device 1.

An abnormality detection and stop circuit 4 that monitors the press control circuit 3 issues a stop signal to stop the press machine when an abnormality occurs in the press control circuit 3. The stop signal issued here can be identified as being caused by an emergency stop, sudden stop, or power cutoff depending on the cause of the failure, and is sent to the signal processing section 12 through the simulation sequencer 2.

Next, the operation of this embodiment will be explained with reference to the flow chart of FIG. First, a failure command is given from the command unit 11 to the simulation sequencer 2. For example, in the press control circuit shown in FIG. 3, two operation button switches S _1A and S _2A give a command to short-circuit terminals T ₁ and T ₂ connected in series.
Then, simulation sequencer 2
Simulation output terminal connected to T ₁ and T ₂
Both SC ₁₁ and SC ₁₂ are turned on, and both terminals T ₁ and T ₂ are shorted to each other.

Here, after setting the operation selector to one safe stroke,
When the command unit 11 sends an operating signal to the simulation sequencer 2, the simulation sequencer 2 sets the press control circuit 3 to the operating state, that is, the terminal
Simulation output terminal connected between T ₁ and T ₂
At the same time as SC ₁ is turned on for about 2 seconds, simulation output terminal SC ₂ connected in series with switches S _{1B and S 2B that are interlocked with operation button switches S 1A and} S _2A is turned off. This is the operation button switch S _1A , S _2A .
This is the same state as when it is turned on for a second.

Then, since the terminals T ₁ and T ₂ of the press control circuit 3 are short-circuited, the abnormality detection and stop circuit 4 detects this and outputs a stop signal to stop the press machine. At this time, even if any terminal is short-circuited by the fault signal, the abnormality detection stop circuit 4
If no abnormality is detected and the press machine is not stopped, the operation for that one stroke is continued, and then the next test item is processed.

When the press machine is stopped by the abnormality detection and stop circuit 4, a stop signal from the abnormality detection and stop circuit 4 is sent to the signal processing section 12 through the simulation sequencer 2. The signal processing section 12 determines the type of stop signal given through the simulation sequencer 2, and causes the printer 13 to print out the determination result. Here, print out either "Power cutoff", "Emergency stop", or "Sudden stop".

After that, a return signal from the command unit 11 is given to the simulation sequencer 2, and the press control circuit 3
to return to its original state. This completes the simulation for one test item, but the same procedure is followed for other test items.

Therefore, according to this embodiment, the press control circuit 3
Since it is possible to simulate what kind of phenomena the press machine exhibits when the circuit configuration of the press machine is changed, the failure location of the press control circuit 3 can be estimated from the phenomena of the press machine.

Therefore, anyone can easily and quickly find the faulty part of the press control circuit 3 without relying on experience or intuition, and as a result, the time required for repair etc. can be reduced, thereby improving the operating rate.

In addition, in implementation, the display section is not limited to the printer described in the above embodiment, but may be a display device such as a CRT. Furthermore, a display such as a CRT and a printer may be used together.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to provide a simulation device for a press control circuit that can easily and quickly determine the cause of a failure when a press machine stops.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention;
FIG. 2 is a flowchart showing a simulation, and FIG. 3 is a circuit diagram showing an example of a press control circuit. DESCRIPTION OF SYMBOLS 1...Command processing device, 2...Simulation sequencer, 3...Press control circuit, 4...Abnormality detection and stop circuit, 11...Command section as failure command means, 12...Signal as signal discrimination means Processing unit, 13... printer as display means.

Claims (1)

[Claims] 1. A press control circuit that controls the drive of a press machine, an abnormality detection and stop circuit that monitors this press control circuit and issues a stop signal to stop the press machine when an abnormality occurs in the press control circuit, and the press control circuit. a failure command means that commands to change the circuit configuration of the circuit to a preset failure state; a simulation sequencer that changes the circuit configuration of the press control circuit in response to the contents of the command from the failure command means; a signal discriminator for discriminating a stop signal when a stop signal is issued from the abnormality detection and stop circuit based on a change in the circuit configuration of the press control circuit; and a display means for displaying the discrimination result of the signal discriminator; A simulation device for a press control circuit, characterized by comprising: