JPS60196898A - Machine monitor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a monitoring device for various machines, and more specifically, the present invention relates to a monitoring device for various machines. The present invention relates to a machine monitoring device that monitors the operating state of a machine to be monitored by comparing the operating state with the operating state during actual operation.

[Prior art]

Monitoring the operating status of machines installed in factories, etc. is important to ensure that if abnormal operation occurs, the failure of the machine will spread, the abnormality will spread to peripheral equipment, the production of defective products, or even the suspension of operations may occur. However, in the past, the operating status of a machine could be estimated using meters that showed the power consumption, voltage, etc. of the machine, pressure needles that displayed the gas pressure inside the machine, etc., or temperature needles, etc. Although it is possible to detect an abnormality when the displayed value of each meter exceeds the permissible value, it is difficult to detect other abnormal operations, and this can lead to serious malfunctions, accidents, etc. I have seen it occur.

[Purpose of the invention]

The present invention has been made in view of the above circumstances,
The normal operating state of the machine to be monitored is memorized in advance.
By comparing this with the operating state during actual operation,
The purpose of the present invention is to provide a machine monitoring device capable of early detection of abnormal conditions in a machine and prevention of failures due to the detection of abnormal operations.

[Structure of the invention]

The present invention stores in advance the operating state of a machine to be monitored during normal operation, and monitors the machine by comparing this with the operating state during actual operation. a detector that detects an operating state or a quantity related to the operation; a storage circuit that stores detection results of the monitored machine during normal operation by the detector; and the storage contents of the storage circuit and the monitoring performed by the detector. an arithmetic device that compares the detection results during actual operation of the target machine, and the arithmetic device compares the information detected by the detector during actual operation of the monitored machine with the normal operation stored in advance in the storage circuit. The apparatus is characterized in that the machine to be monitored is monitored by comparing the detection result with the detection result of the machine.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on drawings showing embodiments thereof.

FIG. 1 is a schematic diagram of a conveyor system lid, which is an example of the object to be monitored by the apparatus of the present invention.

The conveyor system 5 has two chains 5L51, which are driven by a motor M1 in the direction of the white arrow, suspended in parallel in the horizontal direction, and containers 52. 52... is configured to be moved. At important points, there are bags for loading and unloading goods.

In the lifter 6, a piston 61 of an electric cylinder 60 is moved in the vertical direction by a motor M2, and the upward protrusion of the piston 61 causes a lifting platform (not shown) attached to the tip of the lifter 6 to move up and down. As a result, lifter 6
The container 52 located directly above the installation position is lifted.

While the container 52 is being lifted by the lifter 6 in this manner, articles are loaded and unloaded between the container 52 and other conveyor systems, or articles are processed by a worker.

Incidentally, around the installation position of the lifter 6, five glue switches SL to LS for detecting the operations of the container 52 and the piston 61 are arranged.

The first limit switch LSI controls the approach of the container 52 to the location where the lifter 6 is placed.
S2 indicates that the container 52 is located directly above the lifter 6, the third glue switch LS3 indicates the distance of the container 52 from the lifter 6, and the fourth glue switch LS4 indicates that the container 52 is located directly above the lifter 6. Each of the limit switches LS, ~L
The location of S5 is determined.

Further, the above-mentioned limit switch t, s4. A switch dog 63 is provided for operating LS5, and limit switches LSI to L
The operation of S3 is performed by contacting the edge of the container 52 or the like.

FIG. 2 is a block diagram showing the configuration of the device of the present invention and the detectors such as limit switches LS, -LS5, etc. to which the detection results are input.

A predetermined potential Vcc is applied to one end of each normally open contact a1 to a5 of each of the limit switches LS, to S, described above, and when each limit switch LSI to LS5 is activated, each normally open contact a , ~a5 is closed and the photocoupler 26
is operated to input the signal of the current to the CPU 10 which is the control center of the present invention device via the I/○ boat 20, and also operates on the sequence controller 2 which controls the conveyor system 5, lifter 6, etc. Input as a confirmation signal.

Sequence controller 2 is each Riminoto Sui Nochi LS
It is programmed to control the drive of the conveyor system 5 and the drive motors M1 and M2 of the refurbish cross drive according to the on/off signals of + to LS5, that is, the signals given from the normally open contacts a1 to a5. These motors M, M2 are supplied with power from a power source 4 via a breaker B, and current transformers CTr and Cr2 are inserted in the power supply lines to detect the load current, and these current transformers are used to detect the load current. Instrument CT, ,
The output of Cr2 is connected to the diode D1. Comparator C via D2
The signal is input to each of the I and C2 input terminals and converted into a digital electrical signal via the A/D converters 23 and 24, and then input to the CPU 10 via the I10 port 20.

CPII 10 connects current transformer CT via I10 port 20
I.

C70 reads the detected current values to the motors Ml and Mz, respectively. On the other hand, the CPU 10 provides digital signals to the D/A converters 21 and 22 via the I10 board 20 to determine the timing to start reading the current values of the motors Ml and Mz, thereby converting the current values into analog values. A signal is given to one input terminal of the comparators C1 and C2, and this value is the same as that of the motor M1. It is set to a value slightly lower than the steady load current of Mz.

The outputs of both comparators CI and C2 are input again to the OR gate 25, and the output thereof is given to the CPU 10. Therefore, the output of either current transformer CTI or C70 is set by CPU10, and both comparators C1C
2, that is, when the load current value of the motor M1 or Mz exceeds the predetermined value, the output of the OR gate 25 also becomes high level and the CPII 10, which causes motor M1. The configuration is such that the CPU 10 starts reading sampling of the load current value of Mz.

The determination result by CP[Iio is provided to the display 15, relay R, etc. via the I10 boat 14, and the display 15 indicates that the motor M1. The current value to M2 and the status of limit switches LS1 to LSs are displayed, and if overcurrent supply to motors M+ and Mz or abnormal operation of limit switches LS+ to LS2 is detected, I10 boat 14 is displayed. via the relay R, thereby opening the breaker B and turning on the motor M1. Cut off the power supply to Mz.

Note that 32 in the figure is a power supply circuit of the device of the present invention, to which alternating current from the commercial power supply 3 is supplied via a noise cut filter 31. In the figure, 11 is a ROM, 12 is a RAM which is a storage circuit for storing the detection results of the mint switch LS+, etc. during normal operation of the conveyor system 5, lifter 6, etc. that are the machines to be monitored, and 13 is the invention of the present invention. Program R in which a program for controlling the device is stored
OM (P-ROM).

Regarding the operation of the apparatus of the present invention configured as described above, the motor MI during normal operation of the conveyor system 5 and lifter 6
, M2 load current value and limit switch LSI~LS
The explanation will be made with reference to the time chart in FIG. 3 showing changes over time in voltage values indicating on/off of , and the flowchart in FIG. 4 showing control details of the sequence controller 2.

First, the control by the sequence controller 2, that is, the normal operation of the conveyor system 5 and lifter 6, is as follows (
It is.

Time t. At , the motor M1 of the conveyor system 5 is driven, and the chain 51.51 is connected to the container 52.
The lifter 6 is in the lowered position, its motor M2 is stopped, and the limit switch LSI
only is working.

Next, at time t1, when the container 52 approaches the lifter and the limit switch S is activated, the motor M is decelerated, and at time t2, when the limit switch Ls2 is activated, the motor M1 is stopped and the container 52 is moved to the lifter 6. Stops directly above the installation position. Then, the motor M2 of the lifter 6 is rotated in the normal direction, and the container 52 is raised by reflow cross, but this deactivates the limit switch LS4, and when the lifter 6 rises to a predetermined position, the mint switch LS5 is activated. . When the limit switches I and S5 are activated in this manner, the motor M2 is stopped and the lifting of the container 52 is stopped.

After this, the container 52 is stopped at the raised position for a predetermined period of time in order to load and unload goods between the container 52 and another conveyor system, or to process the goods on the container 52 by a worker or the like. After a predetermined time has elapsed or by manual operation by the operator, at time t5, the motor M2 is reversed, the lifter 6 is lowered, and the container 52 is lowered accordingly.

As the lifter 6 descends, the limit switch LS is activated.

is deactivated, and the same LS4 is activated, thereby stopping the motor M2 and stopping the descent of the container 52. Then, at time t7, power is supplied to the motor M1 to drive the chains 51 and 51, and the container 52 moves at a predetermined speed in the direction of the white arrow from the Phthalo installation position, and accordingly, at time tlI. The limit switch LS3 is activated and the separation of the container 52 from the lifter 6 is confirmed.

As described above, the sequence controller 2 controls the motors M, , M based on the operating states of the limit switches LS+ to LSs.
Chain 51.51 of container 52 by controlling the drive of 2
The movement is carried out by a recirculation system, and the movement is moved up and down by a refurbishing machine, and these movements are monitored by the apparatus of the present invention.

First, normal control by the sequence controller 2, ie, normal operation of the conveyor 5 and lifter 6, is stored as a criterion for monitoring. These are the detected current values of the current transformers CT+ and C70 during normal operation of the conveyor 5 and the reflow converter during one normal cycle (from time 1o to t6 shown in FIG. 2), and the respective limit switches LS+ to l, 55
, that is, the on/off state of each normally open contact a1 to a is detected over time and stored in the RAM 12. By repeating this process an appropriate number of times, a temporal average value is determined, and this is used as the criterion shown in FIG. 3.

After the judgment criteria have been established in this way, actual monitoring is performed, but while the sequence controller 2 is controlling as described above, the CPU 10 records the on/off timing of each limit switch LSI to LS5 in the RAM 1.
2, and while the high-level signal from the OR gate 25 is being input, the load current values of the motors M+ and M2 are detected. A.M.
Compare with the judgment criteria stored in 12.

This comparison is considered normal if the difference between the load current value of the motors M+ and M2 and the judgment reference current value is within a predetermined value. The off timing is compared with a determination standard, and if the time difference is within a predetermined range, it is determined that normal operation is being performed.

In this way, the CPU IO monitors the operating status of the conveyor system 5 and lifter 6 controlled by the sequence controller 2, but if it is determined that there is an abnormal operation, the motor Mr. will be displayed on the display 15.

When the display indicates that an abnormality has occurred in any of M2 and limit switches LS and ~LS5, I tell my husband to operate relay R, open breaker B, and switch motor M1. Stop M2.

〔effect〕

As detailed above, the machine monitoring device according to the present invention stores in advance the normal operation of the monitored machine as a criterion, and uses this as a reference during actual monitoring to detect abnormal operation of the monitored machine. Therefore, rather than simply inferring the status of the monitored machine from meters that display current values, voltage values, etc., the occurrence of abnormal operation is specifically detected, so appropriate measures can be taken immediately. It becomes possible to do so.

Therefore, situations such as an abnormal operation of the machine affecting its peripheral equipment, the production of defective products, or a shutdown of the machine can be avoided.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing the conveyor system and lifter that are monitored by the device of the present invention, and the arrangement of detectors for detecting their operating states; FIG. 2 is a block diagram showing the configuration of the device of the present invention; FIG. 3 is a time chart showing the detection status of each detector, and FIG. 4 is a flow chart showing the control contents of the sequence controller. LSI ~LS5...Limit switch CT+,
C70...Current transformation a 5...Conveyor system 6...
・Lifter 10...CPU 12...RAM patent Applicant: Tsubakimoto Gene Co., Ltd. Agent Patent attorney: Noboru Kono

Claims (1)

[Scope of Claims] 1. A detector that detects the operating state of a predetermined part of a machine to be monitored or a quantity related to the operation, and a storage circuit that stores the detection results of the detector during normal operation of the machine to be monitored. and an arithmetic device that compares the memory contents of the storage circuit with the detection results of the monitored machine during actual operation by the detector, and the arithmetic device compares the stored contents of the storage circuit with the detection result of the monitored machine during actual operation by the arithmetic device. A machine monitoring device characterized in that the machine to be monitored is monitored by comparing detection information obtained by the above with detection results during normal operation stored in advance in the storage circuit.