JPH0729218B2 - Press clutch brake controller - Google Patents

Description

The present invention relates to a clutch brake control device for a press.

[Prior Art] The clutch brake control device is required to have a high degree of reliability in order to operate the press accurately and safely.

As shown in FIG. 4, the conventional clutch / brake control device receives the interlock signal INT output from the interlock panel output section 1 and the operation command signal RUN output from the operation command panel output section 2. A pair of control units 111A and 111B that outputs a drive signal for driving the solenoid 5 for clutch and brake are connected in series to the drive circuit 7 for the solenoid 5. As a drive signal,
It is generally used as an open / close signal for relays (RY1, RY2).

In addition, 6 is a power supply. Types such as AC power supply and DC power supply are arbitrarily selected.

Therefore, in each control unit 111A, 111B,
Since the interlock signal INT and the operation command signal RUN are input at the same time, both relays RY1 and RY2 operate simultaneously and drive the solenoid 5.

If either control unit 111A, 111B
If there is something wrong with the relay RY1 (RY2)
Does not operate, the clutch brake operates and safety is ensured.

[Problems to be Solved by the Invention] By the way, each control unit 111A, 111B operates the clutch brake at a predetermined crank angle, and
When there is a change, the function to change the operation timing is often provided.
It is configured by a CPU and the like, and outputs a drive signal after checking several orders and checking a predetermined sequence.

For this reason, the following problems have been pointed out and strongly desired to be solved nowadays, as further safety is required along with further speeding up, diversification, automation and the like.

That is, from the drive circuit 7 side of the clutch / brake solenoid 5, the presence or absence of a drive signal, that is, the relays RY1, RY
It is controlled only by opening and closing 2. Therefore,
If the relays RY1, RY2, etc. are welded due to various matters, there is a problem that is unacceptable in terms of safety because the relays are continuously operated regardless of where the brake should be operated. The same problem occurs when a hardware or software failure occurs in the control units 111A and 111B.

Furthermore, in the current control system that is configured as a feed-forward system as a whole, it is identified as abnormal by confirming that the press is operating even when the interlock signal INT and the operation command signal RUN are in the press stop state. That is, if the anomaly is known afterwards, that is, as a result theory,
Proper treatment and protection cannot be ensured.

In such anomaly detection, when it is judged to be anomalous, there is a high risk that not only will it run too late and defective products will occur, but also die damage as well as personal injury will occur.
In particular, it is difficult to use for ultra-high speed presses such as 1,200 Spm.

Such a problem is not an essential solution even if three or more control units are provided.

The object of the present invention is to continuously drive the clutch brake with the hold drive signal when the crank angle is within the set angle range, and during this period, a pseudo operation command signal is added from the check circuit to the control unit in a hardware and software manner. To provide a clutch / brake control device for a press, which is capable of performing a dynamic verification and checking for abnormality of a control unit early and continuously.

[Means for Solving the Problem] The present invention provides a control unit for receiving a interlock signal and an operation command signal and outputting a drive signal for driving a solenoid for clutch braking, and a solenoid via a signal switching means. A check circuit for adding a pseudo operation command signal to the control unit separated from the drive circuit in place of the operation command signal, and confirming a pseudo drive signal from the control unit based on the pseudo operation command signal to confirm whether the control unit is normal or abnormal. The check circuit is configured to be capable of outputting a hold drive signal that ensures continuous solenoid drive when the crank angle is within a set angle range, and the signal switching means is configured to output the hold drive signal after the hold drive signal is output. Instead of the operation command signal to the control unit, the pseudo operation command signal is sent. Characterized in that the switchable formed as obtain.

[Operation] In the present invention having the above configuration, when the operation command signal is input to the control unit by the operation of the signal switching means, the drive signal is issued and the solenoid is driven.

Here, when the crank angle reaches a set angle such as 340 to 0 to 20 degrees, the check circuit outputs a hold drive signal. After that, the signal switching means switches so that the pseudo operation command signal from the check circuit should be input to the control unit instead of the operation command signal. Then, the control unit outputs a pseudo drive signal based on the pseudo drive command signal. This allows the check circuit to confirm that the control unit is normal. It is possible to determine that the control unit is abnormal if the pseudo drive signal is continuously output even if the pseudo drive command signal is cut off, or if the pseudo drive signal is not output despite the input of the pseudo drive command signal. .

At this time, the solenoid is continuously driven by the hold drive signal.

When this checking step is completed, the signal switching means again switches to input the operation command signal to the control unit, after which the checking circuit cuts off the hold drive signal.

Therefore, it is possible to quickly check whether the control unit is normal or abnormal by the check circuit while ensuring the solenoid drive while the crank angle is within the set angle range. Also,
When it is judged that there is an abnormality, the safety side can be dealt with like stopping the press.

[Embodiment] An embodiment of the present invention will be described below in detail with reference to the drawings.

As shown in FIG. 1, the clutch / brake control device 10 has a
It is composed of a control unit 11, a check circuit 12 and a signal switching means 14.

The interlock signal output unit 1 that outputs the interlock signal INT and the operation command signal output unit 2 that outputs the operation command signal RUN are not particularly limited, but are the same as those in the conventional example shown in FIG. The same applies to the clutch / brake solenoid 5, the power supply 6, and the solenoid drive circuit 7.

First, the control unit 11 receives the interlock signal INT input to the terminal T1 and the operation command signal RUN input to the terminal T2, and causes the solenoid drive circuit 7 to drive the solenoid 5 with a drive signal [relay RY1 It is said to be opened and closed. ] Is a means for outputting.

Further, in this embodiment, in the control unit 11,
When the interlock signal INT is input, the control unit 11 itself self-diagnoses that it is in a normal state in terms of software and hardware.
Is provided.

Therefore, as shown in FIG. 2, the control unit 11 receives the normal signal OK from the terminal TK as long as it is normal when the interlock signal INT is input at the time t1.
Is output. When the operation command signal RUN is continuously input at time t2, the relay RY1 turns on.

Next, the check circuit 12 applies the pseudo operation command signal D.RUN instead of the operation command signal RUN to the control unit 11 separated from the solenoid drive circuit 7 through the signal switching means 14 which will be described later in detail, and this signal D. It is a means for confirming whether the control unit is normal or abnormal by checking the pseudo drive signal CHK from the control unit based on RUN. In other words, by adding a signal D.RUN equivalent to the signal RUN to the control unit forcibly separated from the solenoid drive circuit 7, it is formed to automatically check whether the control unit 11 operates normally or is abnormal. Has been done.

It should be noted here that the switching signals CHG · A and CHG · B are output overlapping for a predetermined time as shown in FIG. The reason is to ensure continuous drive of the solenoid 5 until the hold drive signal is output as long as the operation command signal RUN is input during the normal state.

That is, normally, the control unit 11 drives the solenoid 5 based on the operation command signal RUN, and a specific period such as a crank angle of, for example, 340 to 0 to 20 degrees is determined so that the slide is near the top dead center. Within the crank angle range, the control unit 11 is separated from the solenoid drive circuit 7 while ensuring the driving of the solenoid 5, and the check circuit 12 adds a pseudo operation command signal D / RUN equivalent to the operation command signal RUN to the control unit 11. It is formed to automatically check the normality / abnormality of the control unit 11.

Therefore, when the crank angle signal CRK is input at the time t3 shown in FIG. 2, the check circuit 12 switches the switching signal CHG.
B is output (the switching signal CHG • A is still output at this stage), and in this embodiment, the hold drive signal is output, that is, the relay RY2 is turned on, on condition that the operation command signal RUN is output. After that, the switching signal CHG • A is cut off to disconnect the control unit 11 from the solenoid drive circuit 7 (see steps 10 to 24 in FIG. 3). Then, at time t4, the dummy operation command signal DRUN is sent to the terminal T1R.
Output from. This signal D / RUN is the crank angle signal CRK
The time length Tr is set so that rising and falling occur while is in the ON state. This is because it is possible to check the state in which the operation command signal RUN is cut off and is input to the control unit 11 again at once.

Therefore, the control unit 11 turns on the relay RY1 as long as the pseudo operation command signal D.RUN is input to the terminal T2 as long as it is normal. That is, the pseudo drive signal CHK is output. When the check circuit 12 receives the signal CHK at the terminal T2, the check circuit 12 determines that the control unit 11 is normal. As a result, the control unit 11 outputs the switching signal CHG · A at time t5 to drive the solenoid 5 again, connects the control unit 11 to the solenoid drive circuit 7, and thereafter cuts off the switching signal CHG · B and holds the drive. The signal is cut off (the relay RY2 is turned off) (steps 26 to 34 in Fig. 3).

In step 28 of FIG. 3, the check circuit 11 determines that the simulated operation command signal C is generated even if the simulated operation command signal DRUN is cut off.
When the signal CHK is not input to the terminal T2 even though the signal HK is continuously output as shown by the chain double-dashed line in FIG. 2 or the signal D.RUN is output, it is determined that the control unit 11 is abnormal. If an abnormality is determined, in this embodiment the relay
It is supposed that RY3 is turned off (step 38) to stop the press.

Further, in this embodiment, the relay RY3 is not turned on unless the above-mentioned normal signal OK is input, while the relay RY3 is turned off when the signal OK is interrupted during operation (step 2
8 and 38).

In addition, the signal switching means 14 switches the control unit 11 so as to apply the pseudo operation command signal D / RUN instead of the operation command signal RUN in response to the switching signal CHG / B from the check circuit 12, and this switching. And an output switch 16 for switching the pseudo drive signal CHK output from the control unit 11 in synchronism with the check circuit 12. Each switch 15, 16 is formed of a relay circuit having contacts A, B, respectively. In addition,
The contacts A, A and B, B are temporarily turned on overlappingly.

Therefore, the switching signals CHG • A and CHG • B are alternately output while partially overlapping, as shown in FIG. 2, so that while the switching signal CHG • A is being output. It works by connecting the control unit 11 to the solenoid drive circuit 7 and connecting the control unit 11 to the check circuit 12 while the switching signal CHG / B is being output, and both signals CHG / A and CHG / B When is output redundantly, it is connected to both 7 and 12.

Next, the operation will be described.

First, at time t1 shown in FIG. 2, when the interlock signal INT is input, the control unit 11 inputs the normal signal OK by self-diagnosis.

Then, the check circuit 12, as shown in FIG.
RY3 is turned on to allow the solenoid drive circuit 7 to stand by (steps 10 and 12). If signal OK is not input, keep relay RY3 OFF (steps 28 and 3).
8).

Here, the switching circuit CHG · A is output from the check circuit 12 (step 14).

At time t2 in FIG. 2, the operation command signal RU is output from the output unit 2.
When N is output, this operation command signal RUN is controlled by the action of the input selector 15 based on CHG · A.
Entered in 11. Therefore, the control unit 11
Outputs a drive signal, that is, turns on relay RY1. At this time, the output switcher 16 connects the control unit 11 to the solenoid drive circuit 7. Therefore, the solenoid 5 is driven via the relays RY1 and RY3.

Here, at time t3 in FIG. 2, the crank angle signal CRK
Is output from the encoder 3 and input to the terminal TO of the check circuit 12 (step 16), the check circuit 12 outputs the switching signal CHG · B (step 18) and the operation command signal R
Under the condition that UN is continuously output (step 20), hold drive signal, that is, relay RY2 is turned on, switching signal C
HG / A is shut off, and then the simulated operation command signal D / RUN
Is output (steps 22, 24, 26)).

Therefore, the control unit 11 has the signal switching means.
The signal D.RUN is received in the state of being disconnected from the solenoid drive circuit 7 via 14 (15, 16) and being connected to the check circuit 11. At this time, the solenoid 5 is driven by the hold drive signal (RY2 is ON).

That is, the control unit 11 controls the operation command signal RU.
It has been checked with the dummy operation command signal DRUN equivalent to N. That is, as long as the signal CHK is output, the control unit 11 is normal while the signal D-RUN is being output, and the signal CHK is not output while the signal D-RUN is being output, or the signal D-RUN is being output. Even if the RUN is turned off, if the signal CHK is continuously output as shown by the chain double-dashed line in Fig. 2, it can be judged that the relay RY1 is in an abnormal state such as welding (step 2).
8). If it is determined to be abnormal, the relay RY3 is turned off and the press is stopped (step 38). On the other hand, if it is determined to be normal, the process proceeds to step 30 and below.

In steps 30 and 32, the switching signal CHG · A is turned on again at time t3.
The signal CHG · B is cut off. Signal CHG / A
The control unit 11 causes the signal switching means 14 (15,1
After being connected to the solenoid drive circuit 7 via 6), the hold drive signal (relay RY2 is turned off) is turned on (step 36).

If the normal signal OK is continuously input from the control unit 11, the process returns from step 36 to step 16. When the normal signal OK is not input, the control unit 11 is in an abnormal state, so relay RY3 is turned off and the press is stopped.

If NO is determined in step 10 of FIG. 3, step 38
What is shown in the figure when proceeding to step is to stop the press when a hardware or software abnormality occurs in the control unit 11 no matter which step is in progress.

Thus, according to this embodiment, the control unit
11 and check circuit 12 and signal switching means 14 (15, 16) are provided, and hold drive signal (RY2) is output within the set angle range of the crank to ensure the drive of solenoid 5, and check circuit 12 controls unit. Since it is configured to automatically check whether the control unit 11 is normal or abnormal by adding the pseudo operation command signal D / RUN to 11 and checking the pseudo drive signal CHK, control is performed for each slide stroke while ensuring normal press operation. You can check the failure of the unit 11. Therefore, conventional defects such as press overrun, defective product generation, and die damage, which can only be determined after the operation command signal RUN is turned off, can be eliminated, and accurate and stable press processing can be performed with good performance. . Since only one control unit 11 is required, the cost can be reduced.

Further, the check circuit 12 outputs to the control unit 11 to be checked a pseudo operation command signal D / RUN equivalent to the operation command signal RUN, and further, this pseudo operation command signal D
-RUN is the same signal as the series of operations from the output of the operation command signal RUN called ON-OFF-ON to the cutoff during the output of the switching signal CHG / B, so an abnormality occurred in the control unit 11. It is possible to determine a failure at an instant and take concrete countermeasures early. Also, check circuit 12
The check is performed by using the pseudo drive signal CHK of ON and OFF of the relay RY1 that actually drives the solenoid 5 of the control unit 11, so that it is practical and reliable. Also, it is suitable for ultra-high-speed pressing because it can be checked by switching it electronically.

Further, the check circuit 12 is formed so as to output the signals CHG · A and CHG · B in a partially overlapping manner, and is also formed to output the hold drive signal before the signal CHG · A is cut off. As long as the operation command signal RUN is output, the solenoid 5 can be continuously driven by either of them, so that stable operation can be guaranteed without disturbing the continuous press operation.

Further, since the check circuit 12 is formed to include the relay RY3 for making an emergency stop of the press when an abnormality is judged, the safety can be further improved from this point as well. The hold drive signal (RY2) is also not output when the check circuit 12 itself is out of order, and this also acts on the safety side.

Further, since the control unit 11 is provided with a self-diagnosis function and the check circuit 12 is provided with a function of turning off the relay RY3 even when the normal signal OK is not input, further safety can be secured.

Furthermore, the check of the control unit 11 is performed within the set angle range of the Kunrank angle detected by the encoder 3, and the set angle can be changed. Therefore, even if the control unit 11 fails, the slide can be moved to a safe position. It can be stopped as, and is also effective for ultra-high speed pressing.

[Effects of the Invention] The present invention includes a control unit, a check circuit, and signal switching means for connecting and switching the control unit to a solenoid drive circuit and a check circuit, and performs press operation with a hold drive signal within a set crank angle range. Since it is configured to automatically check whether the control unit is normal or abnormal by adding a pseudo operation command signal equivalent to the operation command signal to the control unit connected to the check circuit in between, the control unit can be operated early during press operation. And you can check continuously and overrun,
It has an excellent effect that contributes to the safe and reliable press operation guarantee that eliminates the conventional defects such as die damage and the establishment of ultra-high-speed press.

[Brief description of drawings]

1 is an overall configuration diagram showing an embodiment of the present invention, FIG. 2 is a timing chart for explaining the operation, FIG. 3 is the same flow sheet, and FIG. 4 is a schematic diagram of a conventional clutch brake control device. Is. 1 ... Interlock signal output part, 2 ... Operation command signal output part, 3 ... Encoder, 5 ... Solenoid, 6 ...
Power supply, 7 ... Solenoid drive circuit, 10 ... Clutch brake control device, 11 ... Control unit, 12 ... Check circuit, 14 ... Signal switching means, 15 ... Input switching device,
16: Output selector.

Claims (1)

[Claims] 1. A control unit for receiving a interlock signal and an operation command signal to output a drive signal for driving a solenoid for clutch braking, and a control unit separated from a solenoid drive circuit via a signal switching means. A check circuit for adding a pseudo driving command signal in place of the driving command signal and checking the pseudo driving signal from the control unit based on the pseudo driving command signal to check whether the control unit is normal or abnormal; When the crank angle is within the set angle range, a hold drive signal for ensuring continuous solenoid drive is formed to be output, and the signal switching means is replaced with an operation command signal to the control unit after the hold drive signal is output. Switchable so as to apply the simulated operation command signal. Press the clutch brake control apparatus, characterized in that.