JPH0386399A - Device for controlling clutch brake in press - Google Patents

Abstract

PURPOSE:To execute safe and sure press operation by enabling changeover so as to apply a false operation command signal instead of an operation command signal to control unit. CONSTITUTION:In a check circuit 12, the false operating command signal D.RUN equivalent to the operating command signal RUN is outputted to the control unit of a check object. This false operating command signal D.RUN is made to the equal signal as executing a series of operation from an output to cutoff of the operating command signal RUN, such as ON-OFF-ON, while outputting the changeover signal. By this method, at that moment, when abnor mality in the control units 11A, 11B is developed, the damage can be decided and the concrete countermeasure can be taken at early time.

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. 6, the conventional clutch brake control device receives an interlock signal INT outputted from an output section 1 such as an interlock panel, and a driving command signal RUN 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 lllA111B
The interlock signal INT and operation command signal RUN are
Since these signals are input at the same time, both relays RYI and RY2 operate simultaneously, causing the solenoid 5 to move in an arc.

If either one of the control units 111A,
If there is an abnormality in IIIB, for example, the one-way relay R
Since Y1 (RY2) does not operate, the clutch brake operates to ensure safety.

[Problems to be Solved by the Invention] By the way, each control unit 111A111B is often provided with functions such as operating the clutch brake at a predetermined crank angle and changing the timing of operating the clutch brake when the SPM changes. It is composed of a complicated logic circuit, a CPU, etc., and outputs a drive signal after making several orders of judgment and checking a 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 viewpoint of the drive circuit 7 for the clutch/brake solenoid 5, it is controlled only by the presence or absence of a drive signal, that is, the opening and closing of relays RY1 and 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 units 111A, 111B
A similar problem occurs when a hardware or software failure occurs.

In addition, in the current control system, which has an overall feedforward configuration, it is possible to detect an abnormality by confirming that the press is operating even when the interlock signal INT and operation command signal RUN are in the press stop state. If we identify abnormalities, that is, we only know about them after the fact, we cannot ensure that appropriate measures and protection can be taken.

In this kind of abnormality detection, there are many rRt'Ls in which, by the time an abnormality is determined, it is already too late and extra operation is required, resulting in not only defective products but also mold damage and even personal accidents. It is suitable for ultra-high speed presses such as.

Furthermore, in the conventional apparatus, even if either one of the control units breaks down, the press is immediately stopped, making it impossible to continue press operation, resulting in a significant drop in productivity.

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

An object of the present invention is to sequentially switch a pair of 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 unit early and continuously. To provide a clutch brake control device for a press capable of continuing press operation with four normal control units when it is determined that the condition is normal, and also automatically checking this control unit.

[Means for Solving the Problems] The present invention includes: a pair 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. In place of the operation command signal, the IjU is sent to the control unit separated from the solenoid drive circuit.
(Jj, a check circuit that applies a drive command signal and checks the #I7 pseudo drive drive signal from the control unit based on this pseudo drive command signal to confirm whether the control unit is normal or not) and if the crank angle is within the set angle range. and a hold drive circuit that ensures continuous solenoid drive regardless of drive signals from each control unit when the control unit is in the control unit, and the signal switching means is configured to be able to alternately switch the control unit to which the pseudo operation command signal is applied, And after the check circuit determines that there is an abnormality, the control unit is disconnected from the solenoid drive circuit, the other control unit is connected to the solenoid drive circuit, and the solenoid is driven by the hold drive circuit within the set angle range. It is characterized in that it can be switched to apply a pseudo driving command signal instead of the driving command signal to the other control unit while the other control unit is in use.

[Function] In the present invention having the above configuration, the signal switching means applies an interlock signal and a driving command signal to one control unit, and disconnects the other control unit from the solenoid drive circuit and connects it to the check circuit. Switch.

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

At this time, the control unit on the (tJ2 side) operates upon receiving a pseudo drive command signal from the check circuit and outputs a pseudo drive signal.If the control unit is in failure, a pseudo drive signal is output within a 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.

In addition, when the check circuit determines that there is an abnormality, the signal switching means forcibly switches to the normal control unit to continue press operation, and the check circuit drives the solenoid using the hold drive circuit. While doing so, also check the control unit.

Therefore, press operation can be performed even while a control unit determined to be abnormal is being replaced.

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

As shown in FIG. 1, the clutch brake control device 10 includes a pair of control units 11A.

11B, one check circuit 12, signal switching means 14, and a hold drive circuit.

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. 6 above, although they are not particularly limited. In addition, the clutch brake solenoid 5° power supply 6 and the solenoid drive circuit 7
The same is true.

First, the control units 11A and IIB have the same structure, and receive the interlock signal IN'r input to the terminal T1 and the operation command signal RUN input to the terminal T2, and drive the solenoid 5 in the solenoid drive circuit 7. A drive signal for driving [opens and closes relay RYI (RY2). ].

Furthermore, in this embodiment, the control unit 11A
When the interlock signal INT is input to (11B), the control unit 11A<11B) outputs a normal signal OK from the terminal TK as a result of self-diagnosis that the control unit itself is in a normal state in terms of software and hardware. A function is provided. Therefore, as shown in FIG. 2, when the interlock signal INT is input at time t1, the control unit IIA (IIB> outputs a normal signal OK from the terminal TK as long as the interlock signal INT is input. When RUN is input, relay RY
2 (RYI) is turned on and press operation begins.

Next, the check circuit 12 checks the first check circuit shown in FIGS. 2 and 3.
It has a next check function and a second check function shown in FIGS. 4 and 5.

First, the first check function is to send an operation command signal R to the control unit [11A (IIB)] separated from the solenoid drive circuit 7 via the signal switching means 14, which will be described in detail later.
This means adds a pseudo driving command signal D-RUN instead of UN and checks the pseudo drive signal CHK from the control unit based on this signal D-RUN to confirm whether or not the control unit is normal. In other words, by applying a signal D-RUN equivalent to the signal RUN to a control unit that has been forcibly disconnected from the solenoid drive circuit 7, it is automatically checked whether the control unit is operating normally or is abnormal. has been done.

Specifically, the switching signal CHG-A (
CHG-B), and also outputs this switching signal CHG-B).
A predetermined time Ta from the time when A (CHG −B) is output
After 1 [Tbl (=Ta1)), the pseudo operation command signal D-RUN is output from the terminal TR.

What should be noted here is the switching signals CHG-A and CHG-
As shown in Fig. 2, B is output repeatedly for a predetermined period of time, and pseudo operation command signal D/RUN is output as switching signal C.
The time length Tr is such that rising and falling are completed within the time length Ta (Tb) of HG-A (CHG-B). The reason is that the operation command signal R
This is to ensure continuous driving of the solenoid 5 as long as UN is input, and also to enable checking of both the input state and cutoff 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 Tl 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. Further, a relay RY3 for forcibly interrupting the solenoid drive circuit 7 is provided.

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

D-RUN) [Step 14.16 (202
2>) L, if 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; otherwise, the signal CHK is input while the signal D-RUN is being output. If the signal C)! is not input, the signal C)! is being output while the signal CHG-A (CHG-B) is being output and the signal D-RUN is not being output. When K is input, the control unit 11A (I
IB) is formed so that it is determined to be abnormal. If it is determined that there is an abnormality, the process proceeds to the second check function (step 28).

Furthermore, in this embodiment, relay RY3 is not turned on unless the above-mentioned normal signal OK is input, and on the other hand, if signal OK is cut off during operation, relay RY3 is turned off (as shown in step 80 in FIG. 5). It is formed.

Now, the second check function checks the control units 11A and 11B alternately, whereas the first check function checks the control units 11A and 11B alternately, whereas if one control unit is determined to be abnormal, the signal uJ conversion means 4 is This function switches to the normally open control unit and performs press operation (driving the solenoid 5), and when a predetermined crank angle is reached, the normally open control unit is connected to the check circuit 12 to perform an automatic check. .

In other words, if one control unit is determined to be abnormal in the first check function, for example, 2 in Figure 2.
Immediately turn on relay RY3 based on ■ and ■ indicated by points am.
If the solenoid 5 is turned off and stopped, the press operation cannot be continued.

Therefore, when one control unit is determined to be abnormal, the control unit is switched to the other (normal) control unit to ensure press operation, and during this continued operation, the control unit is checked to ensure that the crank angle is within the set angle range. It is a function. In this way, press operation can be continued until the abnormal control unit is replaced, and safety is ensured. Note that 3 in Figure 1
is an encoder that outputs a signal CRK that turns ON within the set crank angle range, and is connected to the terminal To of the check circuit 12.

This secondary check function is expressed as shown in FIGS. 4 and 5.

When the second check program in FIG. 5 is started from step 28 in FIG. 3, signals INT and OK are output at time t1 as shown in FIG.
Since the switching signal C is set to N, the switching signal C is set at step 52 in FIG.
Output HG-A.

In other words, in FIG. 2, since the control unit lIA is determined to be abnormal, the signal switching means 14 switches the operation command signal RUN to the control unit 11B on the normal side.
The switching signal CHG-A is outputted so that the switching signal CHG-A can be input to the Here, the solenoid 5 is continuously driven by the control unit 11B.

Here, at time t3 in FIG. 4, when the crank angle signal CRK (for example, turns ON at 350 to 0 to 10 degrees) is input from the encoder 3 (step 54), the control unit 11B is output from the solenoid drive circuit 7. A hold drive circuit or relay RY4 is used to ensure continuous operation of solenoid 5 even when disconnected for checking.
is turned ON (steps 58 and 60), and at the same time, the switching signal CHG-B is output, and then the signal CHG・A is output.
(step 56.62), then at time t4
At step 6, the pseudo operation command signal D-RUN is output and the control unit IIB is checked (step 6).
4.66), if normal, the hold drive circuit is turned 0FF (relay RY4 is turned 0FF) through step 68.70 (step 72).

On the other hand, if there is an abnormality, the process proceeds from step 66 to step 80, and relay RY3 is turned off to stop the press. This is because both control units IIA and 11B are out of order.

In step 74, if the control unit IIA is replaced with a new one or repaired, the process returns to the first check program (Fig. 2) again (step 76), but if the control unit IIA is still abnormal and returns If not, the process returns to step 54 via step 78.

At this time, the solenoid 5 is activated with a drive signal (relay RY2 ON) based on the switching signal CHG-A output in step 68.
) is continuously driven.

Further, in this embodiment, the signal switching means 14 is configured to operate based on the switching signals CHG-A and CHG-8. In other words, check times f? 1s12 color (7) Input for switching to apply the pseudo 111 run command signal D -RUN instead of the run command signal RUN to one control unit 11A (the other control unit 11B) by the switching signal cHG -A (CHG -8). It consists of a switch 15 and an output switch 16 that switches to apply the pseudo drive signal CHK output from one control unit IIA (the other control unit 11B) to the check circuit 12 in synchronization with this switch. Each switch 15, 16 has contact A.

It is formed from a relay circuit having A, B, and B. In addition, contact points A, A and 8. It is temporarily turned on in overlap with B.

Therefore, under the first check program of the check circuit 12, the switching signals CHG-A and CHG-B are output alternately with some parts overlapping, as shown in FIG. , when the driving command signal RtJN is applied to one control unit, the pseudo driving command signal D -RUN is applied to the other control unit.
or can be added.

As a result, the control unit to which the signal RUN is applied drives the solenoid 5, while the signal D
It is understood that -RUN is checked for the other control unit to which it is applied, and that this can be done alternately.

On the other hand, under the second check program, as shown in Figure 4, the normal control unit (IIB) is not checked unless the crank angle is within the set value (CRK is ON). It continues to output a switching signal that inputs the operation command signal RUN to the side control unit (IIB). The switching signal in the case of Fig. 4 is CHG-A.
It is.

Next, the effect will be explained.

First, explanation will be given based on the first check program. At time t1 shown in FIG.
When T is input, control units 11A, 11
A normal signal OK from self-diagnosis is input from B.

Then, as shown in FIG. 3, the check circuit 12 turns on the relay RY3 to allow the solenoid drive circuit 7 to stand by (step 10.12). If the OK signal is not input, relay RY3 remains OFF (step 10.28).

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-RU of the time length Tr is
N 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 IIB by the action of the input cut-off #A device 15 based on the switching signal CHG-A. In contrast, the control unit 11A receives a pseudo operation command signal D.
-RUN is input.

Therefore, control unit 11B outputs a drive signal, that is, turns on relay RY2. At this time, the output switch 16 connects the control unit IIB to the solenoid drive diagram #17, and connects the control unit IIB to the solenoid drive diagram #17.
A is operated to connect A to the check circuit 12.

Therefore, solenoid 5 is connected to relays R, Y2, and relay RY3.
Driven through.

Now, relay RY1 of control unit IIA is also turned on by pseudo operation command signal D-RUN. That is, a pseudo drive signal CHK indicating normality is output.

Therefore, the control unit IIA has been checked with the pseudo driving command signal D.RUN, which is equivalent to the driving command signal RUN. In other words, if the signal CHK is being output only while the signal D-RUN is being output, the control unit 11A is normal, and the signals D and R
Signal CHK is not output while UN is output, or signal D
- If the signal CHK continues to be output even after RUN or OFF, it can be determined that there is an abnormality such as welding of relay RYI (step 18). If it is determined that there is an abnormality, immediately turn OFF relay RY3 to stop the breath. No, the second
Proceed to the next check program (step 28), while
If it is determined to be normal, the process advances to step 20.

In step 20, check circuit 12 outputs signal CHG-B at time t3 in FIG. This time, the input switch 15 switches the operation command signal RUN to the control unit IIA 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 to control A switching action is performed to connect the unit 11B to the check circuit 12.

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

On the other hand, the control unit IIB operates at time t in FIG.
4 (step 24).

As shown in FIG. 2, the control units IIA and IIB output the switching signals CHG-A and CHG·B partially overlappingly, so one of them continues to drive the solenoid 5.

Therefore, the switching signal CHG-B 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 CI (G - A
is input. Therefore, the control unit 11
A is connected to the check DFI@12 and enters the check process, but the final pseudo operation command signal D-RUN (which is originally inputted at the top of the time) is not input, so the At time t5, relay RYI should be turned off.

However, even after time t5, if relay RYI remains ON as shown by the two-dot chain line at ■ in FIG. The normal signal CHK continues to be input.

In other words, the normal signal CHK from the control unit 11A is output at time 0 in Fig. 2 due to the pseudo operation command signal D-RUN, but it is output at other times. . Here, the check circuit 12 determines that there is an abnormality in the control unit 11A, such as welding of the relay RYI (step 24).

In this case as well, the process proceeds to the second check program shown in FIGS. 4 and 5 (step 28).

On the other hand, if the relay RYI is turned off at time t5 when the driving command signal RUN is not input and the pseudo driving command signal D-RUM is not yet input, the control unit IIA is normal.

Therefore, the relay RY3 continues to be in the ON state as shown by the dotted line (■) in FIG. Therefore, at time t5', when the relay RY2 of the control unit 11B to which the operation command signal RUN is input is turned on, the solenoid 5
remains driven as indicated by the dotted line ■.

After that, proceed to step 14 through step 26,
Check both control units IIA and IIB alternately.

Next, explanation will be given based on the second check program.

If control unit IIA is determined to be abnormal at step 24 in FIG. 3 immediately after time t5 in FIG. 2, that is, if control unit IIA is abnormal, the fourth
It functions as shown in FIG. Note that in FIGS. 4 and 5, the case where the control unit IIB is determined to be abnormal is not shown because it is obvious.

In FIG. 5, the check circuit 12 receives the driving command signal R.
Outputting a switching signal CHG-A to operate the signal switching means 14 (15, 16) so that the normal control unit 11B manually operates the UN (step 52);
As a result, the solenoid 5 is continuously driven by the drive signal (relay RY2 or ON).

Now, in FIG. 4, when the signal CRK rises at time t3, the hold drive circuit is driven (relay RY4 is turned ON) in preparation for checking the control unit ttn.
As a result, the press operation continues regardless of whether relay RY2 is ON-OFF (steps 54, 58, 60), and the switching signal CHG-B is output before and after this (step 56).
), and then the signal CHG-A is cut off (step 62).

Thus, at time t4, the pseudo driving command signal D -R
UN is input to the control unit IIB and checked (Steps 64, 661° Signal D-RUNI: If the relay RY2 is turned ON in synchronization and the pseudo operation command signal CHK is output, it is determined that the control unit 11B is normal (Step 66) YES) and the signal CHK is turned ON again.
The solenoid is driven by control unit IIB until (step 68.70). In this case, the hold drive circuit is turned off (relay RY4 is OFF) (step 72), and control unit IIA is not returned to normal. , if the signal OK is output, the process returns to step 54 through steps 74 and 78.

Now, when it is determined that the control unit 11B is also abnormal in step 66,
Turn off relay RY3 and stop the press as shown in ■.
Step 80).

Therefore, if one control unit (11A) is out of order, the other control unit (IIB)
) while continuing the press operation, the control unit (IIB) is also checked by the check circuit 12 in cooperation with the signal switching means 14 (15, 16).

Therefore, the press is not stopped even when one control unit (11A) is replaced, and the other control unit (11B) is checked during this time, so it is safe.

According to this embodiment, the pair of control units IIA and IIB, the check circuit 12, the signal switching means 14 (15, 16), and the hold drive circuit (relay R
Y4) and both control units IIA and I
Switch IB alternately and control unit IIB
While the solenoid 5 is being driven by the control unit IIA (IIA), the other control unit IIA (IIB) is connected to the check circuit 12 to automatically check whether it is normal or abnormal, thereby ensuring normal press operation. At the same time, each control unit IIA, IIB can be checked for failure alternately. Therefore, the conventional drawbacks such as press overruns, defective products, and mold damage due to the fact that a failure cannot be determined until after the operation command signal RUN is turned off can be eliminated, and accurate and stable press processing can be performed with high efficiency. .

However, one of the control units broke down and I! J
By working together with the signal switching means 14 and the check circuit 12, the press operation can be continued with the other normal control unit, resulting in high productivity.Also, during this time, the hold drive circuit ensures the renoid drive and automatically checks, so it is safe. gender is guaranteed.

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 to be checked, and furthermore, this pseudo operation command signal D-RUN is 0N-RUN while the switching signal is being output. OFF-
Since the signal is equivalent to performing a series of operations from the output of the operation command signal RUN (ON) to shutdown, failure can be determined the moment an abnormality occurs in control units IIA and IIB, and specific countermeasures can be taken early. be able to. In addition, since the check in the check circuit 12 is performed using the pseudo drive signal CHK of ON and OF'F of the relays RYI and RY2 that actually drive the solenoids 5 of each control unit IIA and IIB, it is practical and reliable. Become something. In addition, it is suitable for ultra-high-speed presses because it can be checked by switching alternately at electronic speed.

The check circuit 12 also outputs signals CHG-A and CHG-
Since it is configured to output part of B overlappingly,
As long as the operation command signal RUN is output, either control unit IIA or IIB continues to drive the solenoid 5, so that stable operation can be maintained without interfering with continuous press operation. It can be a problem.

Furthermore, since the check circuit 12 includes a relay RY3 for emergencyly stopping the press when an abnormality is determined, safety can be further improved from this point as well.

Furthermore, each control unit 11A, 11B includes
A self-diagnosis function is provided, and relay RY3 is turned off even when a normal signal OK is not input to check circuit 12.
The security of the − layer can be ensured.

Furthermore, since the hold drive circuit is formed by the relay RY4 of the check circuit 12, if the check circuit 12 fails, the relay RY4 will not be turned on, so perfect safety can be achieved from this point of view as well.

[Effects of the Invention] The present invention includes a pair of control units of the same type, a check circuit, a signal switching means for sequentially connecting and switching each control unit to a solenoid drive circuit and a check circuit, and a hold drive circuit. A configuration that automatically checks whether the control unit is normal or abnormal by applying a pseudo operation command signal equivalent to the operation command signal to the control unit connected to the check circuit during press operation using the control unit connected to the circuit. This allows each control unit to be checked alternately and early and continuously during press operation, eliminating conventional drawbacks such as overruns and mold damage, ensuring safe and reliable press operation, and establishing ultra-high-speed presses. In addition, if one control unit is abnormal, press operation is continued by the other control unit, and this other control unit is also configured to automatically check within the set crank angle range, so it does not limit safety. It has the excellent effect of increasing productivity and being easy to handle.

[Brief explanation of drawings]

Fig. 1 is an overall configuration diagram showing an embodiment of the present invention, Fig. 2 is a timing chart for explaining the operation of the first check function, Fig. 3 is a flow sheet, and Fig. 4 is a second
A timing chart for explaining the operation of the next check function, FIG. 5 is a flow sheet, and FIG. 6 is a schematic diagram of a conventional clutch brake control device. ■... Interlock signal output section, 2... Driving command signal output section, 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) A pair 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 control unit that is separated from the solenoid drive circuit via a signal switching means. A check circuit that adds a pseudo drive command signal instead of the drive command signal and checks the pseudo drive signal from the control unit based on the pseudo drive command signal to confirm whether the control unit is normal or abnormal, and the crank angle is set. and a hold drive circuit that ensures continuous solenoid drive regardless of drive signals from each control unit when within the angle range, and the signal switching means can alternately switch the control unit to which the pseudo operation command signal is applied. is formed, and after the check circuit determines that the control unit is abnormal, the control unit is disconnected from the solenoid drive circuit, the other control unit is connected to the solenoid drive circuit, and the hold drive circuit operates the solenoid within the set angle range. A clutch brake control device for a press is configured to be switchable so as to apply a pseudo operation command signal instead of an operation command signal to the other control unit while the press is being driven.