JPH1158098A - Device for detecting abnormality in action and method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the reliability on the detection of abnormality in the action of an objective device by comparing a measured index value and a reference index value and discriminating whether the action of the objective device is abnormal or not, with large or small amount in the measured index value. SOLUTION: In an index value measuring part 3 when an one minute timer becomes time-up condition, a counter value of press shot number is made to the measured index value (c) and outputted to an abnormal action discriminating part 4. At this time, in the abnormal action discriminating part 4, the index value at the time of normally moving in the automatic pressing device before starting the action of this pressing device is inputted as the reference index value (b). In the abnormal action discriminating part 4, the measured index value (c) and the reference index value (b) are compared, and it is discrimited whether the action in the automatic pressing device is abnormal or not with large or small amount in the measured index value (c). In the case the measured index value (c) is larger than the reference index value (b), (c>=b), it is decided to be normal, and in case of (c<b), it is decided to be abnormal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device and a method for detecting an abnormal operation which are suitable for use, for example, in an automatic press.

[0002]

2. Description of the Related Art In general, an automatic press apparatus is known which includes a press machine having a mold for molding a work, and a work transfer mechanism connected to the press machine and conveying the work to the mold. I have. Normally, in such an automatic press device, an abnormality in the press operation is automatically detected by an abnormality detection device in order to increase productivity.

Heretofore, as this kind of operation abnormality detection device, for example, a device disclosed as an "abnormality detection device" in JP-A-54-079000 has been adopted. The operation abnormality detection by the operation abnormality detection device is performed by detecting vibration from the press machine with an acceleration sensor and comparing the amount of impact with a predetermined amount of vibration during normal press operation.

[0004]

However, in the conventional operation abnormality detecting device, the operation abnormality is detected by detecting the mechanical vibration generated from the press machine.
Only a specific operation unit (press machine) can detect the operation abnormality, that is, it cannot detect the operation abnormality of the entire automatic press device, and there is a problem that the reliability of the operation abnormality detection is reduced. .

The present invention has been made in view of such circumstances, and it is possible to detect an abnormality not only in a specific operation unit but also in an operation unit other than this operation unit. It is an object of the present invention to provide an operation abnormality detection device and a method thereof that can enhance reliability.

[0006]

According to a first aspect of the present invention, there is provided an operation abnormality detecting apparatus according to the first aspect of the present invention, wherein an index number corresponding to the number of operation completion pulses output per unit time from a target apparatus. Index measuring unit for measuring the number of indexes, and an operation abnormality determining unit that compares the number of indexes measured by the index number measuring unit with the reference index number and determines whether or not there is an operation abnormality of the target device based on the magnitude of the number of measured indexes. There is a configuration. Therefore, an abnormal operation of the target device is detected based on the number of measurement indices corresponding to the number of operation completion pulses output from the target device per unit time.

According to a second aspect of the present invention, in the operation abnormality detecting device according to the first aspect, the index number measuring section comprises an index number measuring section for measuring the number of indexes per minute. Therefore, an abnormal operation of the target device is detected based on the number of measurement indices corresponding to the number of operation completion pulses output per minute from the target device.

[0008] The invention described in claim 3 is claim 1 or 2.
The above-described operation abnormality detection device is configured to include an information display unit that receives and displays operation abnormality presence / absence information from the operation abnormality determination unit. Therefore, the operation abnormality presence / absence information output from the operation abnormality determination unit is displayed on the information display unit.

According to a fourth aspect of the present invention, in the operation abnormality detecting device according to the first, second, or third aspect, the operation abnormality determination unit includes a reference index number setting unit that outputs a reference index number. Therefore, the reference index number for judging the presence or absence of the operation abnormality in the target device is output from the reference index number input unit to the operation abnormality determination unit.

According to a fifth aspect of the present invention, in the operation abnormality detecting device according to the first, second, or third aspect, the number of indexes corresponding to the number of operation completion pulses output from the target device is measured, and the measured index number is determined. The number of reference indices is used as a reference index number, and a reference index number measuring unit that outputs the reference index number to the operation abnormality determination unit is included. Therefore, the reference index number for judging the presence or absence of the operation abnormality in the target device is output from the reference index number measurement unit to the operation abnormality judgment unit.

According to a sixth aspect of the present invention, there is provided the operation abnormality detecting device according to any one of the first to fifth aspects, wherein the target device is an automatic press device. Therefore, the operation abnormality of the automatic press device is detected based on the magnitude of the number of measurement indices corresponding to the number of operation completion pulses output per unit time from the automatic press device.

According to a seventh aspect of the present invention, there is provided a method for detecting an operation abnormality, comprising: measuring an index number corresponding to the number of operation completion pulses per unit time outputted from a target device; And then determine the presence or absence of an abnormal operation of the target device based on the number of measured indexes.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described.
This will be described with reference to the drawings. FIG. 1 is a block diagram showing an operation abnormality detection device according to the first embodiment of the present invention. In FIG. 1, the operation abnormality detection device denoted by reference numeral 1 includes a reference index number setting unit 2, an index number measurement unit 3, an operation abnormality determination unit 4, and an information display unit 5.

The operation abnormality detecting device 1 includes a press unit (press machine) 6 of an automatic press device (not shown) as a target device.
It is connected to the. Thereby, each time the press lowering operation and the press raising operation are completed, the pressing operation completion pulse a
Is output from the press section 6 to the index number measuring section 3.

The reference index number setting section 2 is connected to the operation abnormality judging section 4. The reference index number b is input to the reference index number setting unit 2 by the operator as a discrimination value for detecting an operation abnormality of the automatic press device (not shown). As a result, the index number during normal operation of the automatic press device (not shown) is set as the reference index b from the reference index number setting unit 2 to the operation abnormality determination unit 4 in advance (before the automatic press device starts operation).
Is output.

The index number measuring section 3 comprises an index number measuring section for measuring an index number corresponding to the number of operation completion pulses a per minute outputted from an automatic press (not shown), and sets a reference index number. Part 2
And an operation abnormality determination unit 4. As a result, the number a of press operation completion pulses per minute is totaled, and the total number of pulses is output to the operation abnormality determination unit 4 every minute as the number of measurement indices c.

The operation abnormality judging section 4 compares the index number c measured by the index number measuring section 3 with the reference index number b, and determines whether or not there is an operation abnormality of the automatic press device (not shown) according to the magnitude of the index number c. And a reference index number setting unit 2
And an index number measuring unit 3. Thereby, the operation abnormality presence / absence information d including the determination result from the operation abnormality determination unit 4 is output to the information display unit 5.

The information display unit 5 comprises an information display unit for receiving and displaying the operation abnormality presence / absence information d from the operation abnormality determination unit 4, and is connected to the operation abnormality determination unit 4. The operation abnormality presence / absence information d includes a discrimination result and a reference index number b
And the number of measurement indices c.

Next, an operation abnormality detecting method according to the first embodiment of the present invention will be described with reference to FIG. FIG. 2 is a flowchart for explaining the operation abnormality detection method according to the first embodiment of the present invention. First, in the index number measuring unit 3, a timer for setting a time-up state in one minute is started to operate, and a press shot number counter is initialized to “0” (step S).
1).

When the press operation completion pulse a output from the press section 6 changes from the OFF state to the ON state (step S2), the press shot counter is counted up (step S3). This operation is repeated until the one-minute timer expires (step S4).

Next, when the one-minute timer has timed out, the index number measuring section 3 outputs the press shot number counter value to the operation abnormality determining section 4 as the measured index number c (step S5). At this time, the index number during normal operation of the automatic press device (not shown) is input to the operation abnormality determination unit 4 as the reference index number b before the operation of the automatic press device (not shown) starts.

Thereafter, the operation abnormality judging section 4 compares the measured index number c with the reference index b, and judges the presence or absence of an abnormal operation of the automatic press (not shown) according to the measured index number c. At this time, the operation of the automatic press device (not shown) is set to a normal state when the measured index number c is larger than the reference index number b (c ≧ b), and is set to an abnormal state when the measured index number c is smaller (c <b). You.

If the measured index number c is larger than the reference index number b, the process returns to step S1 to start the next index number output process.
On the other hand, if it is smaller, the operation of the automatic press (not shown) is stopped (step S6).

In this manner, an abnormal operation of the automatic press (not shown) can be detected. Thereafter, the information display unit 5 receives and displays the operation abnormality presence / absence information d from the operation abnormality determination unit 4.

Therefore, in the present embodiment, the automatic pressing device (not shown) is determined by the magnitude of the number of measurement indices c corresponding to the number of operation completion pulses a output per minute from the automatic pressing device (not shown). Since the operation abnormality indicating the performance degradation of the above-mentioned is detected, it is possible to detect not only the specific operation unit (press unit) but also the operation units other than this operation unit.

Next, a second embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG. FIG. 3 is a block diagram showing an operation abnormality detection device according to a second embodiment of the present invention. In FIG. 3, the same members and the like as those in FIG. 1 are denoted by the same reference numerals, and detailed description is omitted. In the figure, the operation abnormality detection device indicated by reference numeral 21 includes a reference index number measurement unit 22, an index number measurement unit 3, an operation abnormality determination unit 4, and an information display unit 5.

The operation abnormality detecting device 21 is connected to a press section 6 of an automatic press device (not shown) as a target device. Thus, each time the press lowering operation and the press ascending operation are completed, the press operation completion pulse number a is output from the press unit 6 to the index number measuring unit 3 and the reference index number measuring unit 22.

The reference index number measuring section 22 is connected to the press section 6 and the operation abnormality determining section 4. As a result, the number of operation completion pulses a1 is input to the reference index number measuring unit 22 by the input of the reference index number command pulse e by the operator during the normal operation of the automatic press device (not shown). Then, the number of indices per minute is measured from the operation completion pulse number a1, and the measured index number is equal to the reference index number b.
Is output to the operation abnormality determination unit 4.

After the output of the reference index number command pulse e, the automatic press device (not shown) is monitored by the operator, and after one minute, the correct reference index number a is obtained.
Is confirmed in the information display unit 5.

In the operation abnormality detecting device thus configured, the operation abnormality of the automatic press device (not shown) is detected in the same manner as in the prior art. That is, the number of indices corresponding to the number of operation completion pulses a per minute output from the automatic press device (not shown) via the press section 6 is measured, and then this measured index number c
Is compared with a preset reference index number b, and then the presence or absence of an abnormal operation of the automatic press device (not shown) is determined based on the magnitude of the measured index number c.

Therefore, in the present embodiment, it is possible to detect an abnormality not only in a specific operating section (press section) but also in operating sections other than this operating section, as in the first embodiment.

In each embodiment, when the index number measuring unit 3 measures the number of indexes corresponding to the number of operation completion pulses a output from an automatic press (not shown), the measurement is performed per minute. However, the present invention is not limited to this. Of course, the present invention may be applied to a time longer than one minute or a small time.

In each of the embodiments, an example has been described in which the present invention is applied to a case where the target device is an automatic press device. However, the present invention is not limited to this. It is equally applicable.

[0034]

As described above, according to the present invention, an index number measuring section for measuring the number of indexes corresponding to the number of operation completion pulses per unit time output from the target apparatus, and the index number measuring section. An operation abnormality determination unit that compares the number of measurement indices with the number of reference indices and determines whether or not there is an operation abnormality in the target device according to the magnitude of the number of measurement indices. An operation abnormality of the target device is detected based on the magnitude of the number of measurement indices corresponding to the number of pulses.

Therefore, not only a specific operating unit but also an operating unit other than this operating unit can be detected, so that the reliability of detecting an operation error in the target device can be improved.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an operation abnormality detection device according to a first embodiment of the present invention.

FIG. 2 is a flowchart shown to explain an operation abnormality detection method according to the first embodiment of the present invention.

FIG. 3 is a block diagram showing an operation abnormality detection device according to a second embodiment of the present invention.

[Explanation of symbols]

 1 operation abnormality detection device 2 reference index number setting unit 3 index number measurement unit 4 operation abnormality determination unit 5 information display unit 6 information display unit a number of operation completion pulses b reference index number c measurement index number d operation abnormality information

Claims (7)

[Claims] An index number measuring unit for measuring an index number corresponding to the number of operation completion pulses output from a target device per unit time, and comparing the index number measured by the index number measuring unit with a reference index number. An operation abnormality detection unit that determines whether there is an operation abnormality in the target device based on the number of the measurement indexes. 2. The operation abnormality detecting device according to claim 1, wherein said index number measuring section comprises an index number measuring section for measuring the number of indexes per minute. 3. The operation abnormality detection device according to claim 1, further comprising an information display unit for receiving and displaying operation abnormality presence / absence information from the operation abnormality determination unit. 4. The operation abnormality detection device according to claim 1, wherein the operation abnormality determination unit includes a reference index number setting unit that outputs the reference index number. 5. A reference index for measuring the number of indices corresponding to the number of operation completion pulses output from the target device and using the measured number of indices as a reference index number, and outputting the reference index number to the operation abnormality determination unit. A number measuring unit is included.
The operation abnormality detection device according to 2 or 3. 6. The operation abnormality detection device according to claim 1, wherein the target device is an automatic press device. 7. The number of indexes corresponding to the number of operation completion pulses per unit time output from the target device is measured, and then the measured index number is compared with a preset reference index number. An operation abnormality detection method, comprising: judging the presence or absence of an operation abnormality of the target device based on the number of indexes.