JPH0599799A - Method for monitoring mechanical system load fluctuations in carrier equipment - Google Patents

Abstract

(57) [Abstract] [Purpose] To detect the occurrence of abnormalities in the transport device, especially in the mechanical system, at an early stage. [Structure] When monitoring the load fluctuation of the mechanical system after the start of the operation of the transfer device, the electric power or current value of the electric motor 2 at the time of a no-load test at the time of inspection after the completion of the transfer device is stored in the sequencer 4, and The electric power or current value of the electric motor 2 during no-load operation during the test operation after the start of operation is read into the sequencer 4, and the difference between the electric power or current value during the no-load test and the electric power or current value during the no-load operation is calculated. When the duration of the state where the difference limit value preset in the sequencer 4 is exceeded exceeds the time limit value preset in the sequencer 4, an alarm is issued as an abnormality of the mechanical system.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transporting device used for moving an article in the front-rear direction, left-right direction, up-down direction, tilting direction, etc. The present invention relates to a mechanical system load fluctuation monitoring method in a carrier device used for early detection of occurrence of an abnormality in.

[0002]

2. Description of the Related Art Transport devices used for moving articles include lifting units such as chain blocks, hoists and table lifters, cranes such as jib cranes, wall cranes, overhead cranes and bridge cranes. ,
There are various types such as mobile cranes such as truck cranes and wheel cranes.

[0003] For example, in an overhead crane, a ladle crane used for moving and operating a ladle is provided with a girder that moves along the ceiling, a main club and an auxiliary club installed on the girder, and the main club. There is also a structure having a main winding hook (ladle hook) and an auxiliary winding hook provided on the auxiliary club.

Similarly, in an overhead crane, a steel ingot crane used for transporting an ingot holds a steel rod that moves along the ceiling, a club provided in the digit, and a steel ingot provided in the club. There is a structure having a tongue and an auxiliary winding hook provided on the club.

[0005]

In a carrying device used for carrying or operating such ladle, steel ingots and steel products, the carrying or operating accuracy is maintained / improved, and the carrying does not rely heavily on human labor. There was a problem that rationalization of equipment operation, early detection and abnormal repair of abnormal parts in the transportation equipment were required.

[0006]

SUMMARY OF THE INVENTION The present invention has been conceived in view of the above-mentioned problems, and when an abnormality occurs in a conveyor system, particularly in a mechanical system, it is possible to detect this abnormality at an early stage. It is an object.

[0007]

According to a first aspect of the present invention, there is provided a mechanical system load variation monitoring method for a transportation system, wherein a mechanical system load variation monitoring is performed after starting the operation of a transportation system driven by an electric motor. , The electric power or current of the electric motor at the time of the no-load test at the time of inspection after the completion or repair of the carrier is stored in the sequencer, and the electric power or the electric current at the time of no-load operation at the time of the test operation after the start of operation. The value is read into the sequencer, and when the difference between the power or current value during the above no-load test and the power or current value during the above no-load operation exceeds the limit value of the difference preset in the sequencer, a mechanical system error occurs. The feature is that it is determined that there is an alarm and the alarm is output from the sequencer.

According to a second aspect of the present invention, there is provided a mechanical system load fluctuation monitoring method for a carrier system, wherein when monitoring a mechanical system load fluctuation after the start of operation of the carrier system using an electric motor as a drive source. The sequencer stores the electric power or current value of the motor during the no-load test during inspection after completion or repair, and the sequencer stores the electric power or current value of the motor during the no-load operation during test operation after the start of operation. Read time, the duration of the state in which the difference between the power or current value during the above no-load test and the power or current value during the above no-load operation exceeds the difference limit value preset in the sequencer The time preset in the sequencer When the limit value is exceeded, it is judged that there is an abnormality in the mechanical system and an alarm is output from the sequencer. And which has a means for solving the conventional problems with a configuration described above of the invention according to the mechanical system load change monitoring process in the transport devices described above.

[0009]

According to the method for monitoring load fluctuations of a mechanical system in a carrier device according to the present invention, when monitoring a load fluctuation of the mechanical system after the start of operation of the carrier device using an electric motor as a driving source, after the carrier device has been damaged or repaired. The electric power or current value of the electric motor at the time of the no-load test at the time of inspection is stored in the sequencer, and the electric power or current value of the electric motor at the time of no-load operation at the time of test operation after the start of operation is read into the sequencer. When the difference between the power or current value during a load test and the power or current value during no load operation exceeds the limit value of the difference preset in the PLC, it is judged that there is an abnormality in the mechanical system and an alarm is issued from the PLC. Or a power or current value during the no-load test and a power or current value during the no-load operation When the difference exceeds the difference limit value preset in the sequencer and the duration time exceeds the preset time limit value in the sequencer, it is judged that the mechanical system is abnormal and an alarm is output from the sequencer. Therefore, if an abnormality occurs in the transport system, especially in the mechanical system, this abnormality will be detected early, and appropriate repairs will be taken to respond to this, and items such as ladle, steel ingots, and steel materials will be detected. The accuracy of transportation or operation can be maintained or improved, and the rationalization of transportation work that does not rely on human labor can be realized.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a mechanical system load fluctuation monitoring control system adopted in an embodiment of a mechanical system load fluctuation monitoring method in a carrying apparatus according to the present invention, in which 1 is a ladle, a steel ingot, etc. Motor control panel 2 for controlling the left and right front-rear movement, up-down movement, tilting or tipping movement of the article, an electric motor controlled by the electric motor control board 1, and a reference numeral 3 of the electric motor 2. It is a current detector for detecting electric power or current value (current value in this embodiment).

Reference numeral 4 denotes a sequencer. The sequencer 4 reads the current value sent from the current detector 3 at the time of no-load operation in the test operation after the start of operation of the transfer apparatus, and at the same time, transfers the transfer apparatus. The current value (initial setting value) of the motor 2 at the time of the no-load test at the time of inspection after completion or repair is stored, and the difference between the current value during the no-load operation and the current value during the no-load test is stored. Difference between the first control section 4a for outputting, a second control section 4b for comparing the difference between the current values output from the first control section 4a and a limit value of the difference preset in the sequencer 4, and the difference between the current values Is provided with a third controller 4c for comparing the duration of the state in which the preset limit value of the difference is exceeded in the sequencer 4 with the limit value of the preset time in the sequencer 4.

In the mechanical load fluctuation monitoring control system shown in FIG. 1 having such a configuration, the sequencer 4 initially sets the current value of the electric motor 2 at the time of the no-load test in the inspection after the failure or repair of the carrier device. It is stored as a set value.

On the other hand, the current value of the electric motor 2 during the no-load operation during the test operation (for example, once or twice a month) after the start of the operation of the carrier device is measured by the current detector 3 and the sequencer 4 1 Read in the control unit 4a.

In the first control section 4a, the current value (initial setting value) of the electric motor 2 in the no-load test at the time of the inspection after the failure or repair of the carrier device and the test operation after the start of the operation of the carrier device are performed. The difference from the current value of the electric motor 2 at the time of no load operation is output.

Next, in the second controller 4b, the first
The difference between the two current values output from the controller 4a is the sequencer 4
It is compared whether or not the difference limit value set in advance is exceeded.

When the third control section 4c is not provided in the embodiment corresponding to claim 1, the first control section 4 is used.
When the difference between the two current values input to a exceeds a preset limit value of the difference, the second controller 4b issues an alarm output.

Further, as shown in FIG. 1, the third control unit 4
In the case of the embodiment corresponding to claim 2 of the present invention in which c is provided, the state in which the difference between the two current values input to the first control unit 4a exceeds the difference limit value preset in the sequencer 4 Is determined by the second control unit 4b, and whether or not the duration of this state exceeds the time limit value preset in the sequencer 4 is determined by the third control unit 4c. The alarm output S is generated from the third control unit 4c when the limit value is exceeded. Conversely, in the case of a short time in which the above-mentioned duration does not exceed the preset time limit value, the difference between the two current values input to the first control unit 4a is the preset difference limit value. Even when the value exceeds the limit, the alarm is not given because it is a short time.

With such a structure, an abnormality of the transport device, especially in the mechanical system, can be detected at an early stage.

[0019]

According to the mechanical load fluctuation monitoring method for a carrier device according to the present invention, when monitoring the mechanical load fluctuation after the start of operation of the carrier device using an electric motor as a drive source, after the carrier device is damaged or repaired. The electric power or current value of the motor during the no-load test at the time of the inspection is stored in the sequencer, and the electric power or current value of the motor during the no-load operation during the test operation after the start of operation is read into the sequencer. When the difference between the power or current value during a load test and the power or current value during no-load operation above exceeds the limit value of the difference preset in the PLC, it is judged that there is an abnormality in the mechanical system and an alarm is issued from the PLC. Output, or the power or current value during the above no-load test and the power or current during the above no-load operation When the duration of time when the difference between and exceeds the limit value of the difference preset in the programmable controller exceeds the limit value of the preset time in the programmable controller, it is judged that there is an abnormality in the mechanical system and an alarm is output from the programmable controller. With this configuration, when an abnormality occurs in the transport system, especially in the mechanical system, it becomes possible to detect this abnormality at an early stage. Therefore, it is possible to maintain a high transfer accuracy by means of, and it is possible to achieve the remarkably excellent effect that the rationalization of the transfer work that does not rely on a lot of human hands can be easily realized.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a basic configuration of a mechanical system load fluctuation monitoring control system adopted in an embodiment of a mechanical system load fluctuation monitoring method in a carrier device according to the present invention.

[Explanation of symbols]

 1 Electric Motor Control Panel 2 Electric Motor 3 Current Detector 4 Sequencer 4a 1st Control Section of Sequencer 4b 2nd Control Section of Sequencer 4c 3rd Control Section of Sequencer S Alarm Output

Claims (2)

[Claims] 1. The electric power or current of the electric motor at the time of a no-load test at the time of inspection after the completion or repair of the transfer device when monitoring the load fluctuation of the mechanical system after the start of the operation of the transfer device using the electric motor as a drive source. The value is stored in the sequencer, and the electric power or current value of the motor during no-load operation during test operation after the start of operation is read into the sequencer, and the electric power or current value during the no-load test and the above-mentioned no-load operation are read. Mechanical system load fluctuations in a carrier characterized by determining that there is an abnormality in the mechanical system and outputting an alarm from the sequencer when the difference from the power or current value exceeds the preset limit value of the difference in the sequencer Monitoring method. 2. The electric power or current of the electric motor at the time of a no-load test at the time of inspection after the completion or repair of the conveyance device when monitoring the load fluctuation of the mechanical system after the start of the operation of the conveyance device using the electric motor as a drive source. The value is stored in the sequencer, and the electric power or current value of the motor during no-load operation during test operation after the start of operation is read into the sequencer, and the electric power or current value during the no-load test and the above-mentioned no-load operation are read. If the duration of the time when the difference from the power or current value exceeds the difference limit value preset in the sequencer exceeds the time limit value preset in the sequencer, it is judged that there is an abnormality in the mechanical system and the sequencer A method for monitoring mechanical system load fluctuations in a carrier device, which further outputs an alarm.