JPH06221969A - Diagnostic method for ladle crane - Google Patents

Abstract

PURPOSE:To diagnose existence of abnormality by detecting the precursory data of trouble generation in a ladle crane. CONSTITUTION:A motor bearings of a ladle crane 1, a gear reducer 8, a drum 9, bearings 10, a temperature sensor 21 and/or a vibration sensor 22 for rotation of brake pulley and the like are placed and also a data logger 23 is placed on the ladle crane 1. By recording the data detected with the temperature sensor 21 and/or vibration sensor 22 in a data logger 23, diagnosis is done based on the recorded data. Thus, replacement and renewal basis for equipment can be clarified and the data can be used as basic data for equipment improvement.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for diagnosing abnormalities in equipment such as a ladle crane for transporting molten pig iron or molten steel in a converter, which has an extremely bad environment.

[0002]

2. Description of the Related Art Ladle cranes that carry hot metal and molten steel in converters handle dangerous things such as hot metal and molten steel, so if a control system abnormality or equipment trouble occurs, it may lead to a major disaster. -It is an essential condition to ensure certainty and high reliability, and it is important to prevent abnormalities in the control system by detecting abnormalities in the control system and equipment early in case of an accident. The above-mentioned equipment trouble of the ladle crane causes abnormal noise, vibration, etc. as a precursor of the occurrence. Conventionally, since these abnormal noises, vibrations, and the like have been carried by the operator on the crane, it is easy to detect these abnormalities, and in many cases, failures have been prevented by inspection, replacement, or repair.

However, recently, unmanned operation has been attempted by remote operation of a monitor TV of a crane, and abnormalities such as abnormal noise and vibration as precursors of the occurrence of the above equipment trouble may be overlooked, which may lead to equipment trouble. Is high. Conventionally, mechanical failure diagnosis is performed to detect abnormalities such as abnormal noises and vibrations that are precursors to the occurrence of the above equipment troubles, and prevent accidents by appropriate measures. For example, it is considered that a temperature sensor is installed in a bearing or a gear reducer of an installation facility such as a rolling mill, and data is sent to a central monitoring room via a cable to constantly monitor the operating status.

[0004]

A temperature sensor is installed on the rotating part of the bearing and gear reducer of the ladle crane,
The method of sending the data to the monitoring room via the cable and constantly monitoring the operating status is that the ladle crane has a long mileage, it is difficult to install the cable, and the environment is severe under the influence of heat, dust, etc. Therefore, it is difficult to constantly monitor because there is a possibility that sufficient accuracy may not be obtained.

An object of the present invention is to provide an abnormality diagnosis method for a ladle crane capable of early detection of abnormalities such as heat generation, abnormal noise, and vibration, which are precursors to the occurrence of troubles in the ladle crane, at a slight speed. .

[0006]

Means for Solving the Problems The present inventors have made various studies in order to achieve the above object. As a result, we installed a data logger on the ladle crane, recorded various data from temperature sensors installed on the rotating parts of the bearing, gear reducer, drum bearing, brake pulley, etc. of the ladle crane for a certain period of time, and recorded the data. By conducting a facility diagnosis based on this, it is concluded that it is possible to obtain sufficient accuracy data without considering the adverse effects of heat, dust, etc. The invention was reached.

That is, according to the present invention, a temperature sensor and / or a vibration sensor is installed on a rotating portion such as a motor bearing, a gear reducer, a drum bearing, and a brake pulley of a ladle crane, and a data logger is installed on the ladle crane. And / or the data detected by the vibration sensor is recorded in a data logger, and the equipment is diagnosed based on the recorded data.

[0008]

According to the present invention, since the sensor is installed on the rotating part such as the motor bearing and the pulley bearing of the ladle crane and the data logger is installed on the ladle crane, the detected data cannot be immediately obtained at a remote place. However, without being affected by a bad environment such as heat or dust,
Data with sufficient accuracy can be obtained. Therefore,
By analyzing the data recorded by the data logger for a certain period of time, even small changes in the equipment can be grasped, and the repair, replacement, and update criteria of the equipment can be clarified, and operation troubles due to equipment failure can be identified. Can be prevented.

Further, if the detected data exceeds the set allowable value, if the operation is stopped, it is possible to cope with the operation in the abnormal state and the rapid change of the equipment, which is caused by the equipment failure. It is possible to prevent the occurrence of disasters. Temperature sensors (heat sensors) or vibration sensors shall be installed as sensors installed on motor bearings and pulley bearings of ladle cranes. The detection signals of these sensors are recorded in a data logger installed on the ladle crane, and the recorded data is analyzed to extract a weak sign of abnormality.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to FIGS. FIG. 1 is a plan view showing an apparatus configuration for carrying out the method of the present invention, and FIG. 2 is a front view of FIG. In FIG. 1 and FIG. 2, 1 is a ladle crane placed on a rail 2 laid on the ceiling of a building through wheels 3, 4 is a main hoisting device installed on a ladle crane 1, a digit 5 and a digit 4 It is composed of an electric motor 6, a clutch 7, a gear reducer 8, and drums 9 and 10. The main hoisting device 5 is mechanically connected by a gear in the gear reducer 8, and the drums 9 and 1 are connected.
0 is configured to rotate at the same speed. Each drum 9, 10 winds up two wire ropes 11 for a total of 4
The ladle hanging beam 12 is supported by a wire rope 11 of a book. The hanging beam 12 includes a pair of ladle hooks 13.
Is suspended, and the ladle containing molten pig iron or molten steel is grasped and wound up by the pair of ladle hooks 13.
14 is an auxiliary winding device installed on the beam 4 and has an electric motor 15,
It is composed of a clutch 16 and a drum 17. The drum 17 winds up the wire rope having the auxiliary winding hook 18 at the lower part, holds it by the ladle hook 13, and holds the main winding device 5
After moving the ladle containing the hot metal or molten steel that has been wound up with a drive motor (not shown) to the converter or ladle position, lift the rear part of the ladle and tilt it. In the case of molten steel, the ladle is inverted and used to discharge the residue.

Reference numeral 21 is a temperature sensor installed in the bearings of the drums 9 and 10 of the main hoisting device 5 and the clutch 7 of the main hoisting device 5, and 22 is a central shaft of the electric motor 6 and the gear reducer 8 of the main hoisting device 5. With the vibration sensor installed in the bearing part, each temperature sensor 21 and the vibration sensor 22 are connected to the data logger 23 installed on the ladle crane 1,
The data measured by each of the temperature sensor 21 and the vibration sensor 22 is constantly recorded in the data logger 23, and the recorded data is sampled and analyzed at regular intervals to perform an abnormality diagnosis of the ladle crane 1. Incidentally, 24 is a main trolley of the ladle crane 1.

Due to the above-mentioned structure, various rotations of the ladle crane 1 are difficult to be installed due to the severe environment of being easily affected by heat and dust, so that it is difficult to constantly monitor the cable through the cable. Partial data is detected by each temperature sensor 21 and vibration sensor 22, and is constantly recorded in the data logger 23 on the ladle crane 1. Therefore, by collecting the recorded data of the data logger 23 for a fixed period of time, for example, every 12 hours and analyzing the recorded data, it is possible to diagnose the equipment for the presence / absence of abnormality in various rotating parts.

Further, in the method of the present invention, when the measured values of the temperature sensor 21 and the vibration sensor 22 exceed the set allowable values, the operation is stopped so that the operation and the equipment under the abnormal condition are maintained. It can handle sudden changes and prevent disasters. Further, in the present invention, information about various rotating parts of the ladle crane 1 cannot be immediately obtained at a remote place, but it is not necessary to consider the harmful effects of heat, dust, etc. You can get the data.

[0014]

As described above, according to the method of the present invention, it is possible to numerically obtain information on equipment abnormalities that depended on the operator of the crane, and to grasp even small abnormalities in equipment. The replacement and renewal criteria can be made clear. Further, according to the method of the present invention, since data on the change over time of equipment operating conditions can be obtained, it can be used as basic data when equipment is improved.

[Brief description of drawings]

FIG. 1 is a plan view showing an apparatus configuration for carrying out a method of the present invention.

FIG. 2 is a front view of FIG.

[Explanation of symbols]

 1 Ladle Crane 2 Rail 3 Wheel 4 Digit 5 Main Hoisting Device 6, 15 Electric Motor 7, 16 Clutch 8 Gear Reducer 9, 10, 17 Drum 11 Wire Rope 12 Suspended Beam 13 Ladle Hook 14 Supplementary Winding Device 18 Supplementary Hook 21 Temperature Sensor 22 Vibration sensor 23 Data logger 24 Main trolley

Claims (1)

[Claims] 1. A temperature sensor and / or a vibration sensor is installed on a rotating part of a motor bearing, a gear reducer, a drum bearing, a brake pulley, etc. of a ladle crane, and a data logger is installed on the ladle crane to detect the temperature sensor and / or the vibration sensor. Alternatively, a method for diagnosing equipment for a ladle crane is characterized in that the data detected by the vibration sensor is recorded in a data logger, and the equipment is diagnosed based on the recorded data.