JPS58100087A - Method of diagnosing trouble of crane - 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 The present invention relates to a fault diagnosis method for quickly detecting faults in cranes, particularly abnormal conditions in the air system of the trunk section.

In the past, failures in the drive parts of cranes were discovered only after operational problems occurred. Furthermore, when it came to investigating the cause of failures, they relied solely on experience and intuition based solely on operational or external phenomena.

Therefore, by the time a malfunction is noticed, other parts have already been adversely affected, and the cause of the malfunction cannot be immediately identified, and it takes a lot of time to repair it. This has caused problems with container cranes and gamma cranes on ships.

The present invention has been made in view of the above-mentioned circumstances, and by constantly monitoring the internal state of the crane drive unit electrical system,
Provides a method for quickly discovering a failure when the failure appears as an operational phenomenon, or quickly discovering the cause from internal monitoring data when a failure is discovered,
Therefore, the aim is to shorten the loss time caused by #l as much as possible.

That is, the present invention measures voltage or current values at two or more end points in a crane drive air distribution system at regular intervals, stores these measured values in a storage device, and uses an arithmetic device to perform the above-mentioned calculations. The normality or failure of the crane is determined by determining the correlation between the measured values at adjacent end points and comparing this with the correlation in a preset normal state stored in the storage device. If it is determined that this is the case, the crane failure diagnosis method is characterized in that the cause of the failure is found from the measurement data stored in the storage device.

First, the principle of the failure diagnosis method according to the present invention will be explained as follows. The electrical system of the crane drive unit (drive motor control circuit, etc.) is divided into several related elements, 1o1.1011On, as shown in Figure 1.The input (Ai) and output (Ale) of each of these related elements are , ) is designed to hold a one tablet count ratio (Ft y. That is, AI ++ = Ft (A1) −
(11 This functional relationship can be of the following three types (a
t constant times Ale, == α・AI (bl integral Ale, = f e1dt (IA4+11≦ICA1++1
) i + 1 (sl + 1 ”Jl”β1 dt onwards)
No matter what happens, as long as the crane is normal, each related element 10. ...The input (AI) and the output (AI++) at 1ofl satisfy the above functional relationship, and on the other hand, if the crane breaks down, the two will deviate greatly from this functional relationship. Therefore, the input and output of each related element are measured, and if this actual measured value (AI") (A/1+1) satisfies the following formula (2), it is normal, and if not, it is abnormal. It can be determined that

lA'1+1-F amount (AlsuI<'i -----
+21 Here, 'l is the abnormality determination criterion setting value.

In addition, except for (2) Yuukoyoru Sennick, the following (3)
It is also possible to search using the absolute values of the actually measured values (A+') and (A'1++) using Equation 1. That is, the following (
If formula 31 is satisfied, it is considered normal; otherwise, it is considered abnormal.

Al"-41<IA'il<Ai'+#l ---
---+31 Here, Ai'+Al'+1 is a set standard value.

An embodiment of the present invention will be described below with reference to FIG. 2.

In FIG. 2, 1) is the electrical system of the crane drive section. The magnetic pressure or current and the timing signal at two or more end points of the drive unit electrical system 11 are measured by a measuring device 124 at regular intervals. Then, this measured value is input to the calculation device 13. The calculation device 13 stores the input measurement values in the storage device 14 as necessary. In addition, if necessary, the arithmetic unit 13 may calculate the formula (21 or (31)
By calculating the equation, it is determined whether or not the measured values at two or more end points of the drive unit's wax air system 11 satisfy a preset functional relationship. If the functional relationship between these measured values is different from a preset functional relationship, it is regarded as an abnormality or failure, and the operator is notified by displaying a message on the display device 15#. Furthermore, when searching for the cause of a failure, Yuuko reads out part of the data measured so far from the storage device 14 and displays it on the display device 715 by giving an instruction from the operation panel 16.

According to the above-mentioned method of the present invention, the internal state of the electric system of the drive unit of the crane can be constantly monitored, and if a failure is likely to occur, the failure can be automatically and promptly discovered. Sometimes, it is possible to objectively and quickly identify the cause of a problem based on past driving data. Therefore, the recovery period from a failure is shortened, and in the case of cranes such as container cranes and unloaders that are exposed to quays, the negative impact on ship operation schedules caused by such failures can be reduced, resulting in remarkable effects. .

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram for explaining the principle of the crane failure diagnosis method according to the present invention, and FIG. 2 is an explanatory diagram showing an example of the present invention. 10. ~10n...Relationships in the crane's drive section 'I system, 11...Crane's drive section electrical system, 1
2... Measuring device, 13... Arithmetic device, 14... Note+m neck wear, I6... Display device, 16... Operation panel.

Claims (1)

[Claims] Measure the pressure or wax flow value at two or more end points in the crane drive system at regular intervals, and use this measurement 1
At the same time, the arithmetic unit calculates the phase #i between the measured values at adjacent end points and calculates the relationship between the phase #i and the set normal state stored in the storage device. It is possible to determine whether the crane is normal or malfunctioning by checking the mutual relationship, and if it is determined that the crane is malfunctioning, the cause of the malfunction can be determined from the measurement data stored in the device. A crane failure diagnosis method characterized by finding out.