JPH0386400A - Device for controlling clutch brake in press - Google Patents

Abstract

PURPOSE:To safely and surely operate a press by cutting off a control unit from solenoid driving circuit and restricting a signal switching means using another control unit till the preset crank angle is obtained to continuously drive a solenoid. CONSTITUTION:At the time of deciding the abnormality of welding, etc., of a relay RY1 in the control unit 11A with a check circuit 12, the circuit 12 restricts the signal changeover means to continue the press operation till coming to the preset crank angle by using the normal control unit 11B instead of the abnormal control unit 11A without emergency stopping of the relay RY and a solenoid 5. In this case, signal CHG.A is continued to output so as to input operating command signal RUN to the control unit 11B. Therefore, as driving signal, i.e., relay RY2 is continuously turned ON, the relay RY and solenoid 5 are continuously driven. At the time of inputting signal CRK, by turning the relay RY OFF, the press is stopped at the prescribed position.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a clutch brake control device for a press.

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

As shown in FIG. 4, the conventional clutch brake control device receives an interlock signal INT output from an output section 1 such as an interlock panel and a driving command signal R1JN outputted from an output section 2 such as a driving command panel. , a pair of control units IIIA and IIIB that output drive signals for driving the clutch brake solenoid 5 are connected in series to the drive circuit 7 of the solenoid 5. The drive signal is generally an opening/closing signal for the relays (RYI, RY2).

Note that 6 is a power source. The type of AC power supply, DC power supply, etc. is arbitrarily selected.

Therefore, each control unit IIIA.

Since the interlock signal INT and the operation command signal RUN are simultaneously input to 111B, both relays RYI,
RY2 operates simultaneously and drives the solenoid 5.

If either one of the control units 111A,
If there is an abnormality in IIIB, for example, the one-way relay R
Since YI (RY2) does not operate, the clutch brake operates to ensure safety.

[The problem that the invention attempts to solve] By the way, each control unit IIIA.

111B is often provided with functions such as operating the clutch brake at a predetermined crank angle and changing the operating timing when the SPM changes, so it is configured with complex logic circuits, CPUs, etc. The drive signal is output after checking the judgment and predetermined sequence.

For this reason, in today's world where higher speeds, diversification, automation, etc., and even greater security are required, the following problems have been pointed out and their solutions are strongly desired.

That is, from the side of the drive circuit 7 of the clutch brake solenoid 5, the presence or absence of a drive signal, that is, the relay RYI,
It is controlled only by opening and closing RY2. Therefore, if the relays RYI, RY2, etc. are welded due to various reasons, the brakes will continue to operate regardless of where they should be applied, which is an unacceptable problem in terms of safety. Control unit IIIA, l11B
A similar problem occurs when a hardware or software failure occurs.

In addition, in the current control system, which has an overall feedforward configuration, even when the interlock signal INT and operation command signal RUN are in the press stop state, an abnormality can be identified by confirming that the press is operating. In other words, if we only learn of abnormalities after the fact, we cannot ensure that appropriate responses and protection are taken.

In this type of abnormality detection, by the time an abnormality is determined, it is already too late and extra operation is required, which not only results in defective products but also causes damage to the mold and even personal injury.
In particular, it is difficult to apply this method to ultra-high-speed presses such as 1.20 O3 pm.

Furthermore, if there is a failure in one or both of the control units, the press will come to an emergency stop, so the press will come to a standstill in a slide stroke that ignores the relationship with, for example, a material supply machine.

Therefore, the restoration work is troublesome and dangerous.

Providing three or more control units does not essentially solve this problem.

An object of the present invention is to sequentially switch multiple control units, apply a pseudo operation command signal to the switched control unit, perform hardware and software verification, and check for abnormalities in the control units early and continuously. The object of the present invention is to provide a clutch/brake control device for a press that can automatically stop the press after it is determined that the normal control unit is used to continue operation up to a predetermined crank angle.

[Means for Solving the Problems] The present invention includes: a plurality of control units that receive an interlock signal and a driving command signal and output a drive signal for driving a clutch brake solenoid; and a signal switching means. A pseudo operation command signal is applied to the control unit disconnected from the solenoid drive circuit via the solenoid drive circuit in place of the operation command signal, and the pseudo drive signal from the control unit based on this pseudo operation command signal is confirmed to determine whether the control unit is correct or not. The signal switching means is formed to sequentially switch the control unit to which the pseudo operation command signal is applied, and after determining that the check circuit is abnormal, drives the control unit with a solenoid. The present invention is characterized in that the signal switching means is configured to be disconnected from the circuit and restrained so that the solenoid can be continuously driven using another control unit until a set crank angle is reached.

[Function] In the present invention having the above configuration, when there are, for example, two control units, the signal switching means applies an interlock signal and a driving command signal to one control unit, and also pulls the other control unit from the solenoid drive circuit. Switch to connect it to the check circuit.

Then, one control unit outputs a drive signal to drive and control the clutch brake solenoid.

At this time, the other control unit operates upon receiving the pseudo drive command signal from the check circuit and outputs the pseudo drive signal. If the control unit is out of order, the pseudo drive signal will not be output within the predetermined period or will continue to be output outside the predetermined period.

Therefore, the check circuit can check whether the other control unit is normal or not by checking the pseudo drive signal.

Here, since the signal switching means is configured to alternately switch each control unit and connect it to the check circuit, both control units can be sequentially and continuously checked. When the check circuit determines that there is an abnormality, the signal switching means inputs an operation command signal to the normally open control unit to continue operation until the set crank angle is reached and then stop the press at a predetermined position.

[Example] Hereinafter, one practical example of the present invention will be described in detail with reference to the drawings.

As shown in FIG. 1, this clutch brake control device 10 is composed of a plurality of (two in this embodiment) control units IIA, IIB, one check circuit 12, and a signal switching means 14. ing.

Note that the interlock signal output section 1 that outputs the interlock signal INT and the drive command signal output section 2 that outputs the drive command signal RUN are the same as those in the conventional example shown in FIG. 4 above, although they are not particularly limited. In addition, clutch brake solenoid 5゜@Rin 6 and solenoid drive circuit 7
The same is true.

First, the control units 11A and 11B have the same structure, and drive the solenoid 5 in the solenoid drive circuit 7 in response to the interlock signal INT input to the terminal 'r1 and the operation command signal RUN input to the terminal T2. A drive signal for opening and closing relay RYI (RY2). ].

Furthermore, in this embodiment, the control unit)-11
When the interlock signal INT is input to A (11B>), the control unit 11A (IIB) outputs a normal signal OK from the terminal TK as a result of self-diagnosis that the software and hardware are in a normal state. Functions are provided.

Therefore, control unit 11A (IIB)
As shown in FIG. 2, as long as it is normal when the interlock signal INT is input at time t1,
A normal signal OK is output from terminal TK. When the operation command signal RUN continues to be input, relay RY2 (RYI) becomes O.
Do N.

Next, the check FI#112 sends a pseudo run command signal D-RUN to the control unit (11A (11B)) separated from the solenoid drive circuit 7 via the signal switching means 14, which will be described in detail later, in place of the run command signal RUN. This is a means for checking the pseudo drive signal CHK from the control unit based on this signal D-RUN to confirm whether the control unit is normal or abnormal.In other words, if the control unit is forcibly disconnected from the solenoid drive circuit 7 A signal D-R equivalent to the signal RUN is sent to the control unit.
By adding UN, it is configured to automatically check whether the control unit is operating normally or is abnormal.

Specifically, the switching signals CHG, A (C
HG-B), and this switch also outputs CHG-A
A predetermined time Ta1 from the time when (CHG -B) is output
[:'r”bl (=Tal)) then terminal TR
The controller is configured to output a pseudo operation command signal D-RUN from the controller.

What should be noted here is the switching signal C) [G-A and CHG
-B is outputted repeatedly for a predetermined time as shown in FIG.
) The time length Tr is such that the rise and fall are completed within ). The reason is that as long as the operation command signal RUN is input during the normal state, the solenoid 5
This is to ensure continuous driving of the RUN, and also to be able to check both the input state and cut-off state of the operation command signal RUN during a predetermined period.

On the other hand, the normal signal OK from the self-diagnosis from each control unit IIA (IIB) is input to the terminal T1 of the check circuit 12, and the pseudo drive signal CH output from each control unit IIA (IIB) is input to the terminal T2.
K is input. Also, the solenoid drive port i? A relay RY for forcibly shutting off 87 is provided.

Then, the check circuit 12 receives the signals CHG-A, D-RUN (CHG-B), as shown in FIG.

Output D-RUN) [Step 14.16 (2224
)) When the pseudo drive signal CHK is input from the control unit IIA (IIB>) while the signal D -RUN is being output, it is determined to be normal, and in other cases, the signal D
If the signal C)[K is not input while the -RUN is being output, the signal C)[K is not input while the signal CHG-A (CHG-B) is being output and the signal D-RUN is not being output. If the control unit IIA (II
B) is determined to be abnormal. If it is determined that there is an abnormality, the signal switching means 14 (15° The switching signal CHG-A or CHG-B is outputted so as to constrain (step 20.28) 16), and the continuation is formed so as not to switch both signals alternately.

Therefore, when the crank angle reaches the set value, the relay RY is turned off (steps 32 and 34), the solenoid drive circuit 7 is forcibly cut off, and the press is stopped. Therefore, the check circuit 12 has a terminal To
A crank angle signal CRK is input from an encoder 3 for detecting a crank angle connected to.

Furthermore, in this embodiment, the relay RY is not turned on unless the above normal signal OK is input, and the signal O is not turned on during normal operation.
When K is cut off, relay RY is turned off (step 10.30).

Further, the signal switching means 14 uses the switching signal CHG-A (CHG-B) from the check circuit 12 to send a pseudo driving command signal D instead of the driving command signal RUN to one control unit 11A (the other control unit 11B). - input switch 15 for switching to add RUN;
and an output switch 16 that switches to apply the pseudo drive signal CHK output from one control unit 11A (the other control unit IIB) to the check circuit 12 in synchronization with this switching.

Each switch 15, 16 has contacts A, A, B.

It is formed from a relay circuit with B. Note that the contacts A, A and B, B are temporarily turned ON redundantly.

Therefore, as shown in FIG. 2, the switching signals CHG-A and CHG-8 are output alternately with some overlap, so the operation command signal RUN is applied to one control unit. Sometimes, a pseudo run command signal D-RUN is applied to the other control unit. As a result, the control unit to which the signal RUN is applied drives the solenoid 5, and the signals D and RIJN are applied in the meantime (1! One control unit checks, and this is done alternately. It is understood that this is possible.

Further, the signal switching means 14 (15, 16) sends an operation command signal RUN to the control unit on the normal side of the pond when it is determined that the check circuit 12 is abnormal as described above.
The check circuit 12 is configured to restrict the input of the input data continuously.

Next, the effect will be explained.

First, at time t1 shown in FIG. 2, when the interlock signal INT is input manually, the control unit 11
A normal signal OK from self-diagnosis is input from A and 11B.

Then, as shown in FIG. 3, the check circuit 12 turns on the relay RY to allow the solenoid drive circuit 7 to stand by (step 10.12).

If the signal is OK or not input, turn off relay RY.
Leave F (step 10.34>).

Here, the check circuit 12 outputs a switching signal CHG -
A is output for a time length Ta. Subsequently, when the time Ta1 has elapsed, the pseudo operation command signal D -R of the time length Tr is
UN is output (step 14.16).

At this time t2, the operation command signal RU is output from the output section 2.
When N is output, this operation command signal RUN is input to the control unit 11B by the action of the input switch 15 based on the switching signal CHG-A. On the contrary,
The control unit 11A has a pseudo operation command signal D.
-RUN is input.

Therefore, control unit IIB outputs a drive signal, that is, turns on relay RY2. At this time, the output switch 16 connects the control unit 11B to the solenoid drive circuit 7, and connects the control unit 11A to the solenoid drive circuit 7.
is connected to the check circuit 12. Therefore, the solenoid 5 is driven via the relays RY2 and RY.

Now, the relay RY1 of the control unit 11A is also turned on by the pseudo operation command signal D-RUN. That is, a pseudo drive signal C7-IK indicating normality is output. Therefore, the control unit 11A
Pseudo operation command signal D −R equivalent to operation command signal RUN
This means that it has been checked by UN. In other words, the signal D −
If the signal CHK is output only while RUN is being output, the control unit IIA is normal.
Signal CHK is not output while signal D・RUN is output, or signal CHK is not output even after signal D-RLIN is turned OFF.
If it continues to be output, it can be determined that there is an abnormality such as welding of relay RYI (step 18). If it is judged to be abnormal, the process goes to 0, which will be described later.On the other hand, if it is judged to be normal, the process goes to step 22.

In step 22, the check circuit 12 outputs the signal CHG-B at time t3 in FIG.
2) This time, the human power switch 15 switches the operation command signal RUN to the control unit 11A and the control unit IIB to the check circuit 12, and the output switch 16 connects the control unit 11A to the solenoid drive circuit 7. Then, a switching action is performed to connect the control unit 11B to the check circuit 12.

Then, since the signal RUN is being output continuously, the relay RYI drives the solenoid 5.

On the other hand, the control unit 11B operates at time t in FIG.
4 is checked by the pseudo operation command signal D.RUN inputted (steps 24 and 26). If it is determined to be normal, the process proceeds to step 3o, and then returns to step 14 again.

As shown in FIG. 2, the control units 11A and 11B output the switching signals CHG-A and CHG・B partially overlappingly, so one of them is output to the solenoid 5.
Continue to drive.

Therefore, the switching signal C)[G-8 is also turned off when the time length Tb has elapsed, that is, at time t5. on the other hand,
At time t5' prior to this, switching signal CHG-A is input. Therefore, control unit IIA
is connected to the check circuit 12 and enters the check process, but
The pseudo operation command signal D-RUN is still
is input. ) is not input, relay RYI should be turned off at time L5 in FIG.

However, even after time t5 has elapsed, if relay RYI remains ON as shown by the two-dot chain line at ■ in FIG. 2, the check circuit 12 receives a normal signal from the control unit 11A as shown at ■. CHK still continues to be input.

In other words, although the normal signal CHK from the control unit IIA is output at time 0 in Figure 2 due to the pseudo operation command signal D-RUN, it is output at other times. . Here, the check circuit 12 determines that there is an abnormality such as welding of the relay RYI in the control unit IIA (step 18). In this case, step 16 is passed and monitoring is performed in step 18.

Then, the check circuit 12 uses the normal control unit 11B instead of the abnormal control unit IIA to control the setting crank without making an emergency stop of the relay RY and the solenoid 5, as shown by the two-dot line in FIG. restraining the signal switching means (step 2o) to continue the press operation until the angle is reached (step 32);
In this case, the signal CHG-A continues to be output as shown by the dotted line in FIG. 2 so that the operation command signal RUN is input to the control unit IIB.

Therefore, since the drive signal, that is, the relay RY2 continues to be ON as shown by the dotted line in FIG. 2, the relay RY,
The solenoid 5 is continuously driven as indicated by the dotted lines (2) and (2) in FIG.

Then, at time t7, signal CRK is input (
Step 32) and relay RY to 0FF (Step 34)
) and stop the press at the specified position.

In addition, in steps 26 and 28, the control unit II
Even if B is judged to be abnormal, the control unit 11
This is the same as when A or abnormality is determined.

On the other hand, if the control unit 11A is turned off at time t5 when neither the relay RYI nor the run command signal RUN is input and the pseudo run command signal D-RUM is not yet input, the control unit 11A is normal (YES in step 18). , there is no need to turn off relay RY. Therefore, at time t5', when the operation command signal RUN is input, relay RY2 of control unit IIB is turned OFF.
Due to N, the solenoid 5 remains driven as indicated by the dotted line (■). Then, if steps 22 and 24 are passed and YES is determined in step 26, the process proceeds to step 14 through step 30, and both control units 11
Check A and 11B alternately.

According to this embodiment, two (plural) control units 11A, 11B, a check circuit 12, and a signal switching means 14 (15, 16) are provided, and both control units IIA, IIB are alternately switched. While one control unit 11B (IIA) is driving the solenoid 5, the other control unit 11A
<IIB) is connected to the check circuit 12 to automatically check whether it is normal or abnormal, so each control unit 11A, I
You can alternately check for IB failures. Therefore, press overruns and defective products may occur due to malfunctions that cannot be determined until after the operation command signal RUN is turned off.
It eliminates conventional drawbacks such as mold breakage and performs accurate and stable press processing with high performance. If it is determined that there is an abnormality, disconnect the control from the solenoid drive port #17, input the operation command signal RUN to the normally open control unit of that pond, and press until the crank angle signal CRK turns ON at the set angle. Since the operation can be continued and the press is stopped after the slide is in a predetermined position, subsequent measures can be taken quickly and easily.

In addition, the check circuit 12 outputs a pseudo operation command signal D-RUN equivalent to the operation command signal RUN to the control unit y to be checked, and furthermore, this pseudo operation command signal D-RUN is output while the switching signal is being output. 0N-OFF
- Since this signal is equivalent to performing a series of operations from the output of the operation command signal RUN (ON) to shutoff, failure can be determined the moment an abnormality occurs in control units IIA and IIB, and specific countermeasures can be taken early. I can take some classes. Also, the check circuit 12 checks the actual solenoid 5 of each control unit IIA, IIB.
It is practical and reliable because it uses a pseudo drive signal CHK that turns ON and OFF relays RYI and RY2 that drive the relays RYI and RY2. In addition, it is suitable for ultra-high-speed presses because it can be checked by switching alternately at electronic speed.

Also, check time #r12 uses signals CHG-A and C)
[Since the control unit is configured to output part of the signal G-B overlappingly, as long as the operation command signal RUN is output, the solenoid 5 can be continued to be driven by either control unit IIA or IIB. , ensuring stable operation without interfering with continuous press operation.

Further, since the check circuit 12 includes a relay RY for stopping the press in an emergency, the check circuit 12 makes its own decision, and from this point of view, safety can be further improved.

Furthermore, each control unit IIA, 11B has
A self-diagnosis function is provided, and relay RY is also turned off when a normal signal OK is not input in check #112.
Since we have a function to do this, we have a - layer of safety! Can be maintained.

In the above embodiment, there are two control units (IIA, IIB), but three or more control units may be used. In this case, each control unit may be sequentially switched and checked.

[Effects of the Invention] The present invention provides a control unit connected to the solenoid drive circuit, which includes a plurality of control units of the same type, a check circuit, and a signal switching means for sequentially switching the connection of each control unit to a solenoid drive circuit and a check circuit. During press operation, a pseudo operation command signal equivalent to the operation command signal is applied to the control unit connected to the check circuit to automatically check whether the control unit is normal or abnormal. The control unit can be checked early and continuously during press operation, eliminating conventional shortcomings such as overruns and mold breakage, contributing to ensuring safe and reliable press operation and establishing ultra-high-speed presses, as well as when an abnormality is detected. Since the control unit is switched to the normal side control unit and the press is stopped at a predetermined crank angle, subsequent processing is quick and easy, which has the excellent effect of improving productivity.

[Brief explanation of drawings]

Fig. 1 is an overall configuration diagram showing an example of the present invention, Fig. 2 is a timing chart for explaining the operation, Fig. 3 is a flow sheet, and Fig. 4 is an outline of a conventional clutch brake control device. It is a diagram. DESCRIPTION OF SYMBOLS 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, 11A, IIB
...Control unit, 12...Check circuit, 14...Signal switching means, 15...Input switch, 16...Output switch.

Claims (1)

[Claims] (1) Multiple control units that receive interlock signals and operation command signals and output drive signals for driving clutch brake solenoids, and a control unit that is separated from the solenoid drive circuit via a signal switching means. a check circuit for adding a pseudo driving command signal instead of the driving command signal to the driving command signal and checking the pseudo drive signal from the control unit based on the pseudo driving command signal to confirm whether the control unit is normal or abnormal; The signal switching means is formed to sequentially switch the control unit to which the pseudo operation command signal is applied, and after determining that the check circuit is abnormal, disconnects the control unit from the solenoid drive circuit until the set crank angle is reached. A clutch brake control device for a press configured to restrain the signal switching means so that a solenoid can be continuously driven using another control unit.