JPH05162000A - Foreseeing maintenance system for pressing machine - Google Patents

Abstract

PURPOSE:To construct the system to totally maintain the pressmachine by detecting the state of every part of the pressing machine. CONSTITUTION:The foreseeing maintenance system for the pressing machine is provided with plural sensors 21-25, a monitoring unit 20 which monitors the detected value of each sensor 21-25 and outputs the alarm signal when the detected value is an abnormal level form comparing to the standard value, a character displaying unit 32 which displays each abnormal content based on the alarm signal from the monitoring unit 20, and a sequencer 30 which designates the monitor timing of the detected value of each sensor 21-25 against the monitoring unit 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a predictive maintenance system, and more particularly to a predictive maintenance system for a press machine which displays the abnormal contents of each part of the press machine to maintain the press machine.

[0002]

2. Description of the Related Art A pressing machine is used as a processing machine for performing pressing such as drawing and bending on a work. This press machine generally has a drive for raising and lowering the ram. Then, for example, the load state of the driving unit during processing is detected by the sensor, and the overload or the like is detected based on the detection result of the sensor. When an overload or the like is detected, the drive unit is stopped to prevent damage to each unit.

However, in such a press machine, the state of each part of the machine is comprehensively monitored by detecting not only the load state of the drive section but also the vibration state and the amount of displacement and the state of other operating sections. There is no equipment, which can lead to catastrophic failures and accidents. An object of the present invention is to construct a system for comprehensively maintaining a press machine by detecting the state of each part of the press machine.

[0004]

A predictive maintenance system for a press machine according to the present invention comprises a plurality of sensors, a monitor device, a display device, and a timing designating means.
The sensor is provided in each part of the press machine and detects the state of each part. The monitoring device monitors the detection value of each sensor and outputs an alarm signal when the detection value is at an abnormal level based on comparison with a preset reference value. The display device displays each abnormality content based on an alarm signal from the monitor device. The timing designating means, with respect to the monitor device,
The monitor timing of the detection value of each sensor is designated.

[0005]

In the present invention, a plurality of sensors detect the state of each part of the press machine. Then, the timing designating means designates the monitor timing of the detection value of each sensor with respect to the monitor device. In accordance with the timing designation by the timing designating means, the monitor device monitors the detection value of each sensor and outputs an alarm signal when the detection value is in an abnormal level based on comparison with a preset reference value. Then, the display device displays each abnormality content based on the alarm signal from the monitor device.

In this case, the state of each part of the press machine is detected by the sensor, and when the detected value is at an abnormal level, the details of the abnormality are displayed, so that the indication of each part before the actual abnormality occurs. Can know. This makes it possible to avoid sudden failures and accidents and to comprehensively maintain the press machine.

[0007]

FIG. 1 shows a crank press to which an embodiment of the present invention is applied. The crank press 1 is mainly composed of a lower frame 2, an upper frame 3 arranged above the lower frame 2, and a throat portion 4 supporting these at the rear. On the upper surface of the lower frame 2, a table 5 on which a processing work is placed is provided. Below the upper frame 3, a ram 6 that can move up and down is arranged. The ram 6 can be moved up and down by an elevating device which is arranged in the upper frame 3 and includes a motor, a crank mechanism, and the like (not shown). An upper die 7 for processing a work on the table 5 is fixed to a lower portion of the ram 6.

A control box 10 is arranged on the side of the throat section 4. Control box 1
In 0, there is a monitoring unit 2 as shown in FIG.
0 and a control unit 40 including a sequencer 30 are arranged. The monitoring unit 20 and the sequencer 30 each include a microcomputer including a CPU, a RAM, a ROM, and the like. Reference data for each sensor is stored in the RAM of the monitoring unit 20. It should be noted that this reference data is set to be slightly lower than the data when the actual abnormality occurs.

A vibration sensor 21, an air differential pressure sensor 22, a displacement sensor 23, a temperature differential sensor 24 and a motor sensor 25 are connected to the monitoring unit 20. The vibration sensor 21 is for detecting a defective bearing arranged at both ends of the output shaft of the ram 6 lifting motor.
The air differential pressure sensor 22 is for detecting malfunction of the air clutch / brake provided in the lifting device of the ram 6. The displacement sensor 23 is for detecting a bearing failure of the flywheel portion in the lifting device from the deflection of the crankshaft. The temperature difference sensor 24
Is for detecting the difference between the temperature of the bearing metal of the crank portion in the lifting device and the frame temperature (reference temperature). The motor sensor 25 is for detecting an overload of the ram 6 lifting / lowering motor from the power consumption of the motor. Connected to the sequencer 30 are motors for raising and lowering the ram 6 and driving units 31 such as the air driving circuits for the air clutches and brakes. In addition, the sequencer 30 has
A character display 32 including a CRT, a patrol light 33 as a warning light, and a keyboard 34 are connected. It should be noted that various signals are exchanged between the monitoring unit 20 and the sequencer 30.

Next, the control flow of the controller 40 will be described with reference to FIGS. 3 and 4. 3A and 4 show the control flow of the sequencer 30, and FIG. 3B shows the control flow of the monitoring unit 20. In the sequencer 30, first, in step A1,
Initial setting such as setting each drive unit 31 to the initial state is performed. Next, in step A2, it waits until the measurement conditions are satisfied. The measurement condition means a condition for starting measurement for each sensor, for example, the vibration sensor 21.
In the case of the measurement by, the condition is that the motor for raising and lowering the ram 6 is rotating. If the measurement condition is satisfied, the process proceeds to step A3. In step A3, a measurable signal is output.

On the other hand, in the monitoring unit 20,
In step B1, the measurement ready signal is awaited, and if the measurement ready signal is received, the process proceeds to step B2. Step B2
Then, the measurement data is fetched from the sensor. Next, in step B3, it is determined whether or not the measurement data is at an abnormal level by comparing the measurement data taken in in step B2 with the reference data stored in advance in the RAM. If the abnormal level is determined in step B3, step B
Go to 4. In step B4, an alarm signal is output. As a result, the patrol light 33 is turned on.

On the other hand, in the sequencer 30, step A4
At the step (a), the input of an alarm signal is waited, and if an alarm signal is received, the process proceeds to step A5. Further, in the monitoring unit 20, after outputting the alarm signal, the process proceeds to step B5. In step B5, the channel is switched to measure the sensor set as the next channel. After the processing in step B5, the program returns to step B1. If no measurable signal is input in step B1, the process proceeds to step B6.
In step B6, it is determined whether or not it is within the signal waiting time after the program is started. If it is within the signal waiting time, the process proceeds to step B7. In step B7, it is determined whether or not the measurement enable signal is input. If the measurable signal is input, the process proceeds to step B2. If no measurable signal is input in step B7, the process returns to step B6. That is, in steps B6 and B7, the input of the measurable signal is waited for within the signal waiting time. If it is determined in step B6 that the signal waiting time has passed, the process proceeds to step B5. Further, in step B3, if the measurement data captured in step B2 is not determined to be an abnormal level, the process proceeds to step B5.

In step A5, the sequencer 30 determines whether the alarm signal received in step A4 is a plural alarm signal. If it is determined that there are a plurality of alarm signals, the process proceeds to step A6. At step A6, a plurality of messages are switched and displayed on the character display 32. Next, in step A7, it is determined whether or not the switching stop signal is turned on by the key input from the keyboard 34 by the operator.
If the switching stop signal is turned on, the process proceeds to step A8. If it is determined in step A5 that the alarm signal is not plural alarm signals, the process similarly proceeds to step A8. In step A8, the processing method is displayed on the character display 32 according to the message content. In the display of the processing method, the processing method corresponding to each message is stored in the RAM in advance, and the processing method stored in the RAM is displayed.

As a result, the operator can operate the crank press 1
Before each part of the above (3) actually becomes an abnormal state and a failure or the like occurs, it is possible to know the sign of the abnormality by the character display 32 and the patrol light 33, and it is possible to avoid a sudden accident or the like. The operator performs necessary processing according to the processing method displayed in step A8. For example, when the measurement data of the vibration sensor 21 is at an abnormal level, processing such as supplying lubricating oil to the bearing portion or replacing the bearing is performed according to the degree of the abnormality.

Next, in step A9 (FIG. 4), the operator waits for the completion of the processing. When the processing is completed, the operator inputs the processing completion key from the keyboard 34. As a result, the program shifts to step A10. At step A10, the alarm signal for which processing has been completed is reset. Next, in step A11, it is determined whether or not there is another alarm signal. If another alarm signal still remains, the process returns to step A5 to repeat the processing from step A5 to step A10. Also, step A
If there is no other alarm signal at 11, the program returns again to step A2.

In this way, the control by the control unit 40 including the monitoring unit 20 and the sequencer 30 is performed.

[0017]

According to the predictive maintenance system for a press machine according to the present invention, the contents of each abnormality are displayed from the detection values of a plurality of sensors for detecting the state of each part of the press machine. I can predict. As a result, a sudden failure of the press machine can be avoided and the press machine can be comprehensively maintained.

[Brief description of drawings]

FIG. 1 is an overall perspective view of a crank press to which an embodiment of the present invention is adopted.

FIG. 2 is a schematic block diagram of a control unit thereof.

FIG. 3 is a control flowchart thereof.

FIG. 4 is a control flowchart.

[Explanation of symbols]

 1 Crank press 20 Monitoring unit 30 Sequencer 21-25 Sensor 32 Character display

Claims (1)

[Claims] 1. A plurality of sensors provided in each part of a press machine for detecting the state of each part, and the detected value of each sensor is monitored, and the detected value is obtained by comparison with a preset reference value. A monitor device that outputs an alarm signal in the case of an abnormal level, a display device that displays each abnormality content based on the alarm signal from the monitor device, and a monitor timing of the detection value of each sensor with respect to the monitor device A predictive maintenance system for a press machine, comprising: timing specifying means for specifying.