JPH0438960Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to an error detection device used in a machine that repeats a predetermined operation, such as a press machine.

[Prior art and its problems]

In a machine that repeats a predetermined operation, such as a press machine, where the crankshaft drives up and down and repeats the same stroke at a predetermined cycle, various controls such as material feeding, material removal, etc. are executed depending on the operation timing. has been done. Conventionally, machines such as those described above have been provided with an error detection device that detects whether the various operations described above are being performed without abnormality using a circuit as shown in FIG.

In the same figure, the conventional device uses a detector 3 based on a synchronization signal output from a synchronization signal generator 1.
If the output signal from the detector 3 is not output within a specific period, the control circuit 2 lights up abnormality display lamps 4a to 4d to indicate that an abnormality has occurred in material feeding, etc. Inform the operator. At the same time, an abnormality signal is output, and an emergency stop device or the like provided in the machine body is activated to stop the operation of the machine.

Although the detector 3 is shown as a single detector in the figure,
A plurality of them are provided, and each operation signal is sent to the control circuit 2.
When it is determined that there is an abnormality, the corresponding individual lamps 4a to 4d are turned on.

Further, a display 5 is also connected to the control circuit 2, and for example, counts the number of press operations and displays the number of presses.

However, in the above-mentioned error detection device, when an abnormality occurs in material feeding or the like, dedicated abnormality display lamps 4a to 4d are turned on to notify the operator of the abnormality. And, since the lamp is provided corresponding to multiple detectors 3,
This is expensive and causes an increase in the cost of the device. Furthermore, a circuit must be constructed for lighting the lamps for each of the plurality of detectors 3, and the hardware is also complicated.

[Purpose of invention]

SUMMARY OF THE INVENTION In view of the above-mentioned drawbacks of the conventional art, it is an object of the present invention to provide a mistake detection device that has a simple configuration and does not increase costs.

[Key points of the idea]

In order to achieve the above object, the present invention provides an apparatus having a drive mechanism that is driven at a predetermined cycle, an abnormality detection means for detecting an abnormality in an operation performed during a specific period within one cycle, and a mechanism that is driven at the predetermined cycle. a counting means for counting the number of driving times of the counting means, a display means for displaying the counted value of the counting means, and a display means corresponding to a specific display section of a predetermined digit of the display means based on the output of the abnormality detecting means. The apparatus is characterized by comprising an abnormality detection display control means for performing an abnormality detection display.

[Example of idea]

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a circuit block diagram of a mistake detection device according to the present invention. The error detection device of the present invention is installed near the press machine, and detects abnormalities in the feeding of material into the press machine, material outage, and ejection of the product after pressing, and also detects the correct position between the upper and lower molds at a predetermined timing. Detects whether a material is present at a position, etc.

In the figure, a CPU 7 is a central processing unit that controls the error detection device of this embodiment and also performs other controls such as counting the number of presses. This CPU 7 has six detectors 6a to 6f,
Synchronous signal generator 8, display 9, preset section 10
etc. are connected.

The detectors 6a to 6f are, for example, material feed detectors that detect whether a material such as an iron plate formed by the press operation of a press machine is being accurately fed into the press machine. This is a material outage detector that detects whether there is a shortage of material sent from the state in which the material has been removed, and a material discharge detector that detects whether items that have been removed from the material by the upper and lower molds are being discharged. It is a vessel,
These are position detectors, etc. that detect whether the material is placed in the correct position on the upper and lower molds. Various detections by these detectors 6a to 6f are performed, for example, by bringing a contact terminal (probe) into contact with the material and detecting whether or not current flows to ground through the material itself. Detection is also performed using a reflective photo sensor or the like.

For example, the synchronization signal generating section 8 generates a synchronization signal synchronized with the rotation of the rotor by providing a concave part in a rotary body rotated at a predetermined period by a motor in a press machine and bringing the actuator of the switch into contact with this convex part. Also, a synchronization signal that synchronizes with each specific period during one revolution of the rotating body is obtained, and this synchronization signal is output to the CPU 7.

The display 9 is a 6-digit 7-segment display,
Normally, the number of press operations of a press machine is counted. Since it consists of 6 digits, it can count up to 100,000 times. Each segment 9a-9f of this indicator 9 also corresponds to each of the above-mentioned detectors 6a-9f.
Corresponding to 6f, when an abnormality occurs as described later, "1" is set only in the corresponding segments 9a to 9f.
lights up. For example, if an abnormality occurs in the material feeding detected by the detector 6a, the segment 9
"1" is lit on a, and other segments 9b to 9f
Turn off the light. In addition, when the corresponding operation is abnormal due to the signal of any of the other detectors 6b to 6f, the segments 9b to 9f corresponding to the abnormality are also displayed.
"1" is lit in one of the segments, and the other segments are turned off.

The preset unit 10 sets the correspondence between the detectors 6a to 6f and the above-mentioned segments 9a to 9f in advance, and in the above example, when an abnormality occurs in the signal detected by the detector 6a, the preset unit 10 sets the correspondence between the detectors 6a to 6f and the segments 9a to 9f. "1" is turned on, and the segments 9b, 9c, 9d, 9 are made to correspond to the detectors 6b, 6c, 6d, 6e, 6f, respectively, for other detectors other than the detector 6a.
Although "1" is lit in the segments e and 9f, the preset section 10 allows a segment to be set in advance in correspondence with an arbitrary detector.

In addition, the abnormal output is the segments 9a to 9 described above.
This is a signal that is output when "1" is lit in either of f. When this signal is output, the operation of the press machine is stopped by an emergency stop device (not shown) or the like.

When there is no abnormality, the error detection device configured as described above counts the press count operation using the synchronization signal sent from the synchronization signal generator 8, for example, and outputs a count-up signal to the display 9. The information is sequentially output to the display 9 to display the number of press operations. Also, during this time, the CPU 7
The signals output from a to 6f are sent to the synchronization signal generator 8.
According to the synchronization signal from the station, each signal is checked for abnormality during a specific period. Here, for example, when the detector 6a detects a material shortage based on a change in the current flowing to the contact terminal, this detection signal is transmitted to the detector 6a.
is output from to CPU7. The CPU 7 detects this signal during a specific period of the synchronization signal sent from the synchronization signal generator 8, and when it is confirmed that the material is out, it outputs this signal to the display 9 (segments 9a to 9f). All the count data that had been displayed up to that point is erased, "1" is displayed in segment 9a, and an abnormal signal is output to the emergency stop device. When the press machine has stopped, the operator checks the display 9 and can determine that the material has run out because "1" is lit in the segment 9a. This means that other detectors 6
The same is true when the CPU 7 detects an abnormality based on the signals from b to 6f, and only the corresponding segment set in advance by the preset section 10 is set to "1".
By lighting up the ", the operator can easily determine what is causing the abnormality.

In this embodiment, each segment 9a to 9 of the display 9 used to normally display the number of press operations is shown.
f is used to display abnormal data in the event of an abnormality, and this not only makes it easy to understand the cause of the abnormality, but also allows the display 9 to be shared, so it is not necessary to use a dedicated abnormality display as in the past. There is no need to use the lamps 4a to 4d, etc.

In this embodiment, the display device 9 is composed of six segments 9a to 9f, but the number is not limited to six, and it goes without saying that the number of detectors 6a to 6f is not limited to six. be.

Furthermore, “1” is displayed on the display 9 when an abnormality occurs.
The display is not limited to "1", and it goes without saying that the display is not limited to lighting but may also be displayed by blinking.

[Effect of idea]

As explained in detail above, according to the present invention, an abnormality can be displayed on the conventionally used display for counting the number of mechanism operations, so there is no need to use a dedicated lamp for abnormality indication, and the device can be easily operated. Cost can be reduced. Furthermore, it can be implemented with an extremely simple configuration without using complicated hardware.

[Brief explanation of the drawing]

FIG. 1 is a circuit block diagram of the error detection device of this embodiment, and FIG. 2 is a circuit block diagram of a conventional error detection device. 6a to 6f...Detector, 7...CPU, 8...
Synchronous signal generator, 9...Display device, 9a to 9f...
Segment, 10...Preset section.

Claims (1)

[Claims for Utility Model Registration] In an apparatus having a drive mechanism that is driven at a predetermined cycle, an abnormality detection means for detecting an abnormality in an operation performed during a specific period within one cycle; and the number of times the mechanism is driven at the predetermined cycle. a counting means for counting, a display means for displaying the count value of the counting means in a plurality of digits, and a display means corresponding to a specific display section of a predetermined digit of the display means based on the output of the abnormality detection means. An error detection device comprising: an abnormality detection display control means for performing an abnormality detection display.