JPH0256397A - Checking device for crane wore rope - Google Patents

Abstract

PURPOSE:To improve precision and effect of maintainance work and enhance safety thereof by comprising the check of good precision performed with image over approximately total length of a wire rope monitored by a TV camera and the size of dia., etc., analyzed by signals from this image and the checked results reserved as records. CONSTITUTION:Hoisting and lowering operation of a crane is performed to monitor the surface of a wire rope 2 using TV cameras 14a, 14b that image the state of broken element wires, affected rust, wear, corrosion, deformation and, etc., in a monitor TV 18. Also, image signals form an image sensor 13a is treated electrically by a picture processing device 17 to enumerate the dia. and the wear extent of the wire rope 2 through an enumeration means and additionally to detect easily and precisely such defects as rust, corrosion, broken element wires, wear, deformation and, etc., in accordance with comparison data through a defect detecting means for the wire rope 2. The image signals and enumerated data are recorded in a recorder 19 for reserving the results of check.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a wire rope inspection device for an overhead crane, etc., and particularly to a wire rope inspection device that can automatically and quickly inspect a wire rope. Regarding equipment.

(Prior Art) As shown in the perspective view of FIG. 3, the hoisting device of a conventional overhead crane is a hoisting device 1 that fixes one end of each of two wire ropes 2, and has one hoisting device that winds up the two wire ropes 2. The drum 3 is rotatably connected to the drum 3 by two reduction gears 4 forming a pair on both sides thereof, and the reduction gears 4 are driven by a motor 5. Further, the wire rope 2 is suspended from the drum 3, and a load block 8 consisting of a plurality of hook sheaves 6 and one hook 7 is attached.
Another terminal is connected to the equalizer beam 10 via a plurality of sheave sheaves 9 provided on the main body of the hoist W1. Here, when the motor 5 is operated to rotate the drum 3 forward or reverse, the wire rope 2 is wound up or let out, and the hook 7 is moved up and down freely.

This wire rope 2 is also stipulated in the safety regulations, and it is necessary to periodically inspect it to maintain it in a normal condition and to record the inspection results. In this case, the inspector first lets out the wire rope 2 from the drum 3, lowers the hook 7 to the floor, looks up at the wire rope 2 from the floor, and checks the condition of the wire rope 2, such as wire breakage, wear, rust, corrosion, etc. Check for abnormalities such as deformation. In addition, an inspection stand is installed on the floor, and measurements and records are made from the inspection stand to see if there is any decrease in the diameter of the wire rope 2. Furthermore, the inspector transfers to the overhead crane and checks for abnormalities in the terminal retaining portion of the wire rope 2 wound around the drum 3, and for damage, loosening, and falling off of the terminal fittings.

(Problems to be Solved by the Invention) Since the condition of the wire rope 2 is visually checked by an inspector from the floor or from an inspection stand, only a general confirmation can be made. In addition, wire rope 2 may be broken, worn out, rusted,
It has been difficult to detect and determine the presence of corrosion, deformation, etc., unless the person has sufficient experience, such as a manufacturer's specialized inspector. Further, changes in the condition of the wire rope 2 are inspected mainly by measuring the diameter as a change in the outer shape of the wire rope 2. Therefore, it is sufficient to measure the diameter over the entire length of the wire rope 2, but as described above, when inspecting on the floor or on the inspection stand, it is possible to measure only the range within the reach of the inspector. On the other hand, the lifting height of cranes varies depending on the application, and in all cases work is required at heights, and the length of the wire rope 2 ranges from tens to hundreds of meters depending on the lifting height of the crane, so visual measurement surveys over this entire length are necessary. Even if the number of personnel was increased, it still took about one day, and it was extremely difficult to save quantitative records of the inspection results.

The present invention has been made in view of the above, and its purpose is to monitor and record video over almost the entire length of a wire rope using a TV camera, etc., and to analyze dimensions such as diameter from this video signal. To provide a wire rope inspection device for lanes, which enables general inspectors to carry out highly accurate inspections in a short time and to store the inspection results as quantitative records.

[Structure of the invention]

Means for Solving the Problem) The present invention provides continuous imaging means for the surface of a wire rope, means for electrically processing this image signal to calculate the diameter and wear amount of the wire rope, and a means for calculating the diameter and wear amount of the wire rope. The present invention includes a defect detecting means for detecting an abnormality in the wire rope and determining it as a defect by comparing the signal and setting data, a recording means for the video signal and the detected data, and a video monitor.

(Function) While hoisting and lowering the crane, the surface of the wire rope is imaged by imaging means to display the wire rope's condition such as wire breakage, rusting, abrasion, corrosion, deformation, etc. on the monitor, and to display this image on the monitor. The signal is electrically processed and the calculation means calculates the diameter and wear amount of the wire rope, and the wire rope defect detection means detects rust, corrosion, etc. based on the comparative data.
Easily and accurately detect defects such as wire breaks, wear, and deformation. Further, the video signal and the calculated data are recorded by a recording means to save the inspection results of the wire rope.

(Example) An embodiment of the present invention will be described with reference to the drawings.

Note that the same components as those in the prior art described above are given the same reference numerals, and detailed explanations will be omitted.

Fig. 1 is a perspective view of the hoisting device of an overhead crane. They are rotatably connected by a reducer 4, and this reducer 4 is driven by a motor 5.

On the other hand, the wire rope 2 is suspended from the drum 3.

It is configured to communicate with a load block 8 consisting of a hook sheave 6 and a hook 7, and an equalizer sheave provided on the main body of the hoisting device 1. Therefore, by rotating the drum 3 in the normal or reverse direction, the wire rope 2 is wound up or let out, and the hook 7 can be moved up and down freely. A guide rail 11 is fixed between the reducers 4 on both sides, and a screw shaft 12 interlocked with the reducers 4 is rotatably provided. Then, two image sensors 1, which are image pickup means, are engaged with the guide rail 11 and the screw shaft 12 to move horizontally, and are penetrated by wire ropes 2 orthogonal to each other.
3a and 13b are provided. The thread pitch of this threaded shaft 12 is such that the image sensors 13a and 13b move horizontally in accordance with the hanging position of the wire rope 2 fed out from the drum 3, and the threads on the left and right sides are cut in opposite directions. Therefore, the left image sensor 13a and the right image sensor 13b move in opposite directions.

The two image sensors 13a and 13b have one of them as the second image sensor.
As shown in the block diagram in the figure, it is composed of a plurality of TV cameras 14a and 14b for photographing the surface of the wire rope 2, and an illumination device 15. Also, TV cameras 14a, 1
The video signal of the inspection surface of the wire rope 2 photographed at 4b is sent via the cable 16 to the image processing device 17, which is a calculation means and defect detection means, and is branched and displayed on a monitor television 18, and is also subjected to image processing. In the device 17 2
By converting it into a straightened signal, the diameter calculation and shape recognition of the wire rope 2 are performed. Furthermore, it comprises a recorder 19 that records the image and dimensional data of the inspection surface of the wire rope 2 that has been electrically processed by the image processing device 17.

Note that the image input format used for shape recognition may be any format such as a camera method, a flying spot scanner method, or a rotating drum scanner.

Next, the effect of the above configuration will be explained. When inspecting the wire rope 2, the inspector pays out the wire rope 2 from the drum 3 to the hoisting device 1 of the crane and attaches it to the hook 7.
Operate to lower the machine to the floor. By this operation, the power from the reducer 4 is transmitted to the screw shaft 12, and the screw shaft 12 rotates. As a result, the image sensors 13a and 13b move horizontally along the guide rail 11, always corresponding to the hanging position of the wire rope 2 paid out from the drum 3. The illumination device 15 provided on the image sensors 13a, 13b illuminates the inspection surface of the wire rope 2 surface, and the plurality of TV cameras 14a, 14b continuously illuminate the inspection surface of the wire rope 2 as it is paid out from the drum 3. Take a photo. This video signal is sent to an image processing device 17 via a cable 16 and then displayed on a monitor television 18.

The inspector first looks at the image displayed on the monitor television 18 and monitors the wire rope 2 for abnormal conditions such as rusting, corrosion, wire breakage, deformation, etc.

The video signals from the image sensors 13a and 13b are converted into binary signals by the screen processing device 17, the shape of the wire rope 2 is electrically recognized, and the diameter etc. of the wire rope 2 are automatically calculated and pre-swaged. The wear amount is calculated by comparing it with the designed diameter value of the wire rope 2. Furthermore, it is compared with the allowable diameter of the wire rope 2, patterns of corrosion, rust, wire breakage, deformation, etc. of the design data entered in advance, and if it is outside the set value, it is judged as a defect. Detect this automatically. Note that the diameter of the wire rope 2, the amount of wear, and the detection results of the presence or absence of abnormal conditions such as wire breakage and deformation are recorded in the recorder 19.

As described above, the person inspecting the wire rope 2 can detect rust on the wire rope 2 by unwinding the wire rope 2 from the drum 3 while checking the image displayed on the monitor TV 18 installed in the operator's cab of the overhead crane. , corrosion, deformation, etc. can be easily inspected in detail. In addition, since the shape of the wire rope 2 can be recognized by electrically processing this video signal, the wire rope 2 can be automatically and accurately inspected for the amount of wear and the presence or absence of abnormal appearance defects such as wire breakage and deformation. It is possible and does not require any skill. In addition, since the inspection results such as the amount of wear on the wire rope 2 and the presence or absence of defects such as wire breakage and deformation of the strands are recorded in the recorder 19, it is easy to review or store them at a later date. In addition, even if the wire rope 2 is long, the inspection can be carried out quickly and with high precision, so the inspection is highly reliable and the inspection time is only a few minutes compared to the conventional method, so that the inspection work time can be significantly shortened.

In the above embodiment, two image sensors are installed at all times, but depending on how the wire rope 2 is hung, one
A stand or more may be used, and the same effect can be obtained by using a removable type that is installed only during inspections.

Furthermore, in one embodiment, a case was explained in which there is no measurement error correction due to deflection of the wire rope 2, but by measuring the diameter etc. of the wire rope 2 multiple times and averaging the measured values, the wire rope at the time of inspection can be adjusted. It is possible to correct the measurement error due to the shake of No. 2. Note that the image processing device 1
An alarm circuit is installed in the wire rope 7, and if an alarm is generated when a part of the wire rope 2 that exceeds the preset wear amount or defects that exceed the allowable value such as wire breakage or deformation are detected during the inspection, even if the inspection Even if there is an oversight in the monitor by a staff member, the defect is immediately reported without any problem.

〔Effect of the invention〕

As described above, according to the present invention, detailed inspections of wire ropes can be carried out in a short time and accurately by ordinary workers who can perform lifting and lowering operations of the crane, and the inspection results can be quantified together with image signals. It can be saved as a permanent record and can be reviewed repeatedly, improving the accuracy and effectiveness of wire rope maintenance work.

This has the effect of increasing driving safety.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a hoisting device for an overhead crane showing an embodiment of the present invention, Fig. 2 is a block diagram of a wire rope inspection device of the present invention, and Fig. 3 is a conventional hoisting device for an overhead crane. FIG. 1... Hoisting device, 2... Wire rope. 3... Drum, 8... Load block, 11... Guide bar 12... Screw shaft, 13a, 13b... Image sensor, 14a,
14b...TV camera, 15...Lighting device. 17... Image processing device, 18... Monitor television, 19... Recorder. Agent Patent Attorney Norio Ogo Figure 2 Figure 1

Claims (1)

[Claims] A crane equipped with a hoisting device that winds up and unwinds a wire rope by rotating a drum around which a wire rope is wound with a load block attached to the tip, and moves by following the lateral movement of the wire rope suspended from the drum. and an imaging means that continuously photographs the surrounding area of the wire rope, electrically processes this video signal to calculate the diameter of the wire rope, and calculates the amount of wear from the preset diameter data of the wire rope. a calculation means for calculating, and inputting and electrically processing the calculation signal and the video signal to generate video data of the appearance state of the wire rope such as rusting, corrosion, wire breakage, deformation, etc. defect detection means for comparing the amount of wear and abnormal appearance of the wire rope and outputting a signal indicating that the wire rope has a defect when the amount of wear and abnormal appearance of the wire rope is outside a set value; 1. A wire rope inspection device for a crane, comprising a recording means for storing a calculated value of a rope diameter, and a monitor for displaying an image from the imaging means.