JP3218474U - Wire rope inspection device and crane - Google Patents

Abstract

Provided are a wire rope inspection device and a crane that can accurately determine the presence or absence of abnormality in a wire rope and can easily identify an abnormal portion after the wire rope is inspected.
A wire rope inspection device (1) includes a speed measuring unit (30) for measuring a moving speed of a wire rope (2) moving by winding or unwinding a winch, a tomographic unit (40) for photographing a tomography of the wire rope (2), and a tomography A cross-sectional image of the wire rope 2 is generated from the tomographic image captured by the imaging unit 40, and an abnormal location specifying unit that specifies a location where the wire rope 2 is abnormal based on the cross-sectional image, and the movement measured by the speed measuring unit 30 A marking unit 60 for identifying and marking a portion of the wire rope 2 that is determined to be abnormal by the abnormal portion specifying unit based on the speed.
[Selection] Figure 1

Description

  The present invention relates to a wire rope inspection device and a crane.

  Some cranes are provided with a wire rope inspection device. For example, Patent Literature 1 discloses a wire rope inspection device that photographs the periphery of a wire rope and determines whether there is an abnormality in the wire rope from the obtained video data.

  Further, Patent Documents 2 and 3 include a detector that detects a change in the magnetic coupling state between the wire rope and the magnetic pole when the hook moves up and down by a coil, and the abnormality of the wire rope is detected from the output signal of the detector. A wire rope inspection device for determining the presence or absence is disclosed.

Japanese Patent Laid-Open No. 2-56397 JP-A-7-137985 JP-A-8-169688

  In the wire rope inspection, it is necessary to inspect a number of inspection items such as a change in the rope diameter, the presence of a rough wire break, or the presence of kinks.

  However, in the wire rope inspection device described in Patent Document 1, it is difficult to determine the presence / absence of an abnormality simply by determining the presence / absence of an abnormality from the appearance of the wire rope.

  Further, the wire rope inspection devices described in Patent Documents 2 and 3 can determine only the abnormality of the wire rope that appears as a change in the magnetic coupling between the wire rope and the magnetic pole. For this reason, it is difficult to accurately determine whether there is an abnormality.

  Furthermore, the wire rope inspection device described in Patent Literatures 1-3 only issues an alarm when there is an abnormality in the wire rope. For this reason, it is difficult to discriminate an abnormal part after inspection.

  The present invention has been made to solve the above problems, and can accurately determine the presence or absence of an abnormality in a wire rope, and can easily determine the location of an abnormality after the inspection of the wire rope and The purpose is to provide a crane.

In order to achieve the above object, a wire rope inspection device according to the first aspect of the present invention comprises:
A speed measuring unit that measures the moving speed of the wire rope that moves by winding or unwinding the winch;
A tomography unit for imaging the tomography of the wire rope;
Generating a cross-sectional image of the wire rope from the tomographic image captured by the tomography unit, and identifying an abnormal location identifying unit that identifies a location where the wire rope is abnormal based on the cross-sectional image;
Based on the moving speed measured by the speed measuring unit, a marking unit that specifies and marks the location of the wire rope that the abnormal location specifying unit has determined to be abnormal,
It is characterized by providing.

The tomography unit continuously images the wire rope moving by winding or unwinding the winch,
The abnormal part specifying unit generates a continuous cross-sectional image from a tomogram obtained by continuous imaging by the tomographic imaging unit, and the wire rope has an abnormality based on the generated continuous cross-sectional image The location may be specified.

The crane according to the second aspect of the present invention is
A wire rope inspection device according to the first aspect is provided.

  According to the configuration of the present invention, the abnormal part specifying unit specifies an abnormal part from the tomographic image. For this reason, it is possible to detect not only an abnormality in the outer shape of the wire rope but also an abnormality inside the wire rope. As a result, it is possible to accurately determine whether or not the wire rope is abnormal. Moreover, since marking is performed at a location where the marking portion is determined to be abnormal, it is possible to easily determine where the wire rope is abnormal after inspection.

It is sectional drawing of the wire rope inspection apparatus which concerns on embodiment. It is a block diagram of the wire rope inspection apparatus which concerns on embodiment. It is a schematic diagram of a tomographic image generated by a tomographic image generation unit provided in the wire rope inspection device according to the embodiment. It is the elements on larger scale of the crane equipped with the wire rope inspection apparatus which concerns on embodiment.

  Hereinafter, a wire rope inspection device and a crane according to embodiments of the present invention will be described in detail with reference to the drawings. In addition, the same code | symbol is attached | subjected to the same or equivalent part in a figure.

The wire rope inspection device according to the embodiment is a wire rope inspection device provided in a winch of a crane. A wire rope wound up or down by the winch is passed through the wire rope inspection device. This wire rope inspection device checks whether or not there is an abnormality in the wire rope when the crane is being operated when the wire rope is unwound from the winch drum.
The configuration of the wire rope inspection device will be described with reference to FIGS. Next, the operation of the wire rope inspection device will be described.

FIG. 1 is a cross-sectional view of a wire rope inspection device 1 according to an embodiment. FIG. 2 is a block diagram of the wire rope inspection device 1. FIG. 3 is a schematic diagram of a tomographic image generated by the tomographic image generation unit 52 included in the wire rope inspection device 1. FIG. 4 is a partially enlarged view of the crane 100 equipped with the wire rope inspection device 1 according to the embodiment.
As shown in FIG. 1, a wire rope inspection device 1 includes a housing 10 through which a wire rope 2 is passed, rollers 20A and 20B provided inside the housing 10 and wound around the wire rope 2, and rollers A tomographic image (tomographic image) of the wire rope 2 from a speed measuring unit 30 that measures the rotational speeds of 20A and 20B, a tomographic unit 40 that captures a tomographic image of the wire rope 2, and an image captured by the tomographic unit 40. ) And a control unit 50 that identifies a location where there is an abnormality in the wire rope 2 from the generated tomographic image, and a marking unit 60 that marks a location that the control unit 50 determines to be abnormal.

  The housing 10 is formed in a rectangular parallelepiped shape, and through holes 11 and 12 are formed in both side walls in the longitudinal direction. The wire rope 2 is loosely inserted into the through holes 11 and 12. The wire rope 2 is wound or unwound by the winch drum 110 shown in FIG. And the through-hole 11 is arrange | positioned in the direction D of the winding-down side of the wire rope 2, and the through-hole 12 is arrange | positioned on the opposite side. For this reason, in the housing 10, when the wire rope 2 is rolled down, the wire rope 2 moves from the through hole 12 in the direction D on the through hole 11 side.

  The rollers 20 </ b> A and 20 </ b> B are provided near the through holes 11 and 12 in the housing 10. The rollers 20A and 20B are provided in pairs with the wire rope 2 passed through the through holes 11 and 12 therebetween. And it is provided so that rotation is possible. Although not shown, the rollers 20A and 20B are pressed against the wire rope 2 by an elastic member such as a spring. Thereby, the rollers 20 </ b> A and 20 </ b> B rotate in conjunction with the movement of the wire rope 2. Although not shown, the rotary shafts of the rollers 20A and 20B are provided with a rotary encoder, that is, a rotation sensor that detects the rotation of the rotation shaft. The rotation sensor outputs the detected rotation amount data to the speed measurement unit 30.

  The speed measuring unit 30 includes a time measuring unit (not shown). The speed measurement unit 30 obtains the rotation speed of the rollers 20A and 20B from the time data measured by the time measurement unit and the rotation amount data detected by the rotation sensor, and obtains the moving speed of the wire rope 2 from the obtained rotation speed. Outputs moving speed data. The speed measuring unit 30 outputs the obtained moving speed data to the control unit 50.

  The tomography unit 40 is configured by a CT scanner (Computed Tomography Scanner). Specifically, the tomography unit 40 includes an X-ray source 41, an X-ray detector 42 facing the X-ray source 41, and a rotation drive mechanism 43. The wire rope 2 is passed between the X-ray source 41 and the X-ray detector 42. The X-ray source 41 emits X-rays. The X-ray detector 42 detects X-rays and acquires a tomographic image of the wire rope 2. The rotation drive mechanism 43 rotates the X-ray source 41 and the X-ray detector 42 around the wire rope 2. During the imaging by the tomography unit 40, the wire rope 2 moves in a certain direction. Thereby, the tomography part 40 image | photographs the wire rope 2 by a helical scan system substantially. In addition, the tomography unit 40 includes a time measuring unit. Each time the X-ray detector 42 acquires a tomographic image of the wire rope 2, the tomography unit 40 outputs to the control unit 50 imaging time data measured by the timing unit together with the tomographic image.

  As shown in FIG. 2, the control unit 50 includes a speed calculation unit 51 that obtains the moving speed of the wire rope 2 and a tomographic image generation unit 52 that reconstructs a tomographic image of the wire rope 2 from the image acquired by the tomography unit 40. And the location where the abnormality of the wire rope 2 is detected from the tomographic image reconstructed by the tomographic image generation unit 52, and the location where the abnormality location specifying portion 53 and the location where the abnormality location specifying portion 53 is abnormal is identified. A marking instructing unit 54 that determines the marking time by the marking unit 60 from the moving speed obtained by the speed calculation unit 51 and instructs the marking unit 60 to perform marking at the determined time.

  The speed calculation unit 51 rotates from the moving speed of the wire rope 2 obtained from the speed measuring unit 30 so that the X-ray source 41 and the X-ray detector 42 of the tomography unit 40 make one round around the wire rope 2. Ask for. The speed calculation unit 51 outputs rotation speed data indicating the calculated rotation speed to the rotation drive mechanism 43 of the tomography unit 40. The rotation drive mechanism 43 rotates the X-ray source 41 and the X-ray detector 42 at the rotation speed indicated by the rotation speed data. Thereby, the pitch of the helical scan is maintained constant.

  The tomographic image generation unit 52 reconstructs a continuous tomographic image of the wire rope 2 from the tomographic images of the wire rope 2 taken from 360 ° various directions taken by the tomographic imaging unit 40. The tomographic image generation unit 52 determines the time when the portion having the tomographic image passes between the X-ray source 41 and the X-ray detector 42 in the generated tomographic image based on the imaging time of the original image. Associate.

  The abnormal part specifying unit 53 determines whether or not the wire rope 2 is abnormal from the tomographic image output by the tomographic image generation unit 52, that is, whether or not the cross-sectional shape of the wire rope 2 is different from the reference shape by a predetermined amount or more. judge.

  In detail, the abnormal part specific | specification part 53 measures the diameter of the wire rope 2 shown in FIG. 3 from a tomographic image, and determines whether the diameter of the measured wire rope 2 is smaller than a reference value. Thereby, the abnormal part specific | specification part 53 determines whether the wire rope 2 is worn out. Moreover, the abnormal part specific | specification part 53 measures each diameter of the some strand 3 which comprises the wire rope 2 from a tomographic image, and determines whether each diameter of the strand 3 is smaller than a reference value. Thereby, the abnormal part specific | specification part 53 determines whether the one part strand 3 is worn out.

  When the abnormal part specifying unit 53 determines that the cross-sectional shape of the wire rope 2 is different from the reference shape by a predetermined amount or more, it outputs abnormal data indicating that there is an abnormality to the marking instruction unit 54.

When the abnormal data is output from the abnormal part specifying unit 53, the marking instructing unit 54 determines the photographing part of the wire rope 2 from the moving speed of the wire rope 2 obtained by the speed calculating part 51 and the photographing time data of the tomography part 40. The time required to move from the tomography unit 40 to the marking unit 60 is obtained. Specifically, when the distance from the tomography unit 40 to the marking unit 60 is L and the moving speed of the wire wire rope 2 is V, the marking instruction unit 54 determines the time T required from the tomography unit 40 to the marking unit 60. From equation (1).
T = L / V (Formula 1)
The marking instructing unit 54 obtains the time at which the portion of the wire rope 2 determined to be abnormal reaches the marking unit 60 by adding the time T obtained from the equation (1) to the photographing time. The marking instruction unit 54 outputs instruction data that is an instruction to mark the marking unit 60 at the obtained time.

  Returning to FIG. 1, the marking unit 60 is arranged side by side with the tomography unit 40. The position is a direction D on the lowering side with respect to the tomography unit 40. The marking unit 60 faces the wire rope 2 sandwiched between the rollers 20A and 20B. For this reason, when the abnormal part specific | specification part 53 specifies the abnormal part of the wire rope 2, the abnormal part of the wire rope 2 will flow into the marking part 60, and the marking part 60 will face the abnormal part. Become. On the other hand, the marking unit 60 receives instruction data from the marking instruction unit 54. The reception time is when it faces the abnormal part of the wire rope 2. The marking part 60 sprays colored ink on the wire rope 2 to mark abnormal places.

  Next, with reference to FIG. 4, operation | movement of the wire rope inspection apparatus 1 is demonstrated. In the following description, it is assumed that the winch drum 110 of the crane 100 is rotated to wind the wire rope 2 down. The wire rope inspection device 1 is disposed between the winch drum 110 and the sheave 120 shown in FIG. 4, and is installed so as to be movable in the axial direction of the sheave 120 in conjunction with the sheave 120. To do. Further, it is assumed that the wire rope inspection device 1 is supplied with electric power from a power source (not shown) and the rotation sensors of the rotation shafts of the rollers 20A and 20B are operating.

  When the wire rope 2 is lowered by the winch drum 110, the wire rope 2 is fed out in the direction D on the lowering side shown in FIG. Thereby, the wire rope 2 flows from the through holes 11 to 12. At this time, the rollers 20A and 20B shown in FIG.

  When the rollers 20A and 20B rotate, the rotation sensor described above detects the rotation of the rollers 20A and 20B. The rotation sensor outputs the detected rotation amount data to the speed measurement unit 30. Thereby, the speed measurement unit 30, the tomography unit 40, the control unit 50, and the marking unit 60 are activated.

  The speed measuring unit 30 obtains the rotational speed of the rollers 20A and 20B, and further obtains the moving speed of the wire rope 2 from the obtained rotational speed. Then, the speed measuring unit 30 outputs the obtained moving speed data to the control unit 50. The control unit 50 obtains the rotation speeds of the X-ray source 41 and the X-ray detector 42 of the tomography unit 40 from the moving speed acquired from the speed measurement unit 30 and rotates the tomography unit 40 at the rotation speed.

  On the other hand, the portion of the wire rope 2 that enters from the through hole 11 of the housing 10 moves to a position facing the tomography unit 40. At this time, the tomography unit 40 images the wire rope 2 by the helical scan method and outputs the captured tomographic image to the control unit 50.

  The control unit 50 acquires a tomographic image of the tomography unit 40 and reconstructs a continuous tomographic image of the wire rope 2 from the acquired tomographic image. The control unit 50 determines whether or not the cross-sectional shape of the wire rope 2 is different from the reference shape by a predetermined value or more from the reconstructed tomographic image. If the control unit 50 determines that the difference is greater than a predetermined value, from the above-described moving speed of the wire rope 2 to the position where the portion of the wire rope 2 photographed by the tomography unit 40 faces the marking unit 60. Find the time to move. The control unit 50 obtains the time when the portion of the wire rope 2 imaged by the tomography unit 40 faces the marking unit 60 from the obtained time, and outputs instruction data to the marking unit 60 at that time.

  On the other hand, if the control unit 50 determines that the cross-sectional shape of the wire rope 2 is not different from the reference shape by more than a predetermined value, the control unit 50 does not output instruction data.

  When the instruction data is input from the control unit 50, the marking unit 60 marks the opposing wire rope 2 with colored ink. At this time, the marking unit 60 is photographed by the tomography unit 40 of the wire rope 2, and is determined to be abnormal, that is, a portion where the cross-sectional shape of the wire rope 2 is determined to be different from the reference shape by a predetermined amount or more. The part is moving. For this reason, marking is given to the abnormal part of the wire rope 2.

  The marked portion of the wire rope 2 is fed out of the housing 10 from the through hole 12 of the housing 10 by the lowering of the winch drum 110. Thereby, the part inspected for the presence or absence of abnormality by the wire rope inspection device 1 is fed out in the direction D on the lowering side. The wire rope 2 inspected by the wire rope inspection device 1 is marked on a portion determined to be abnormal. For this reason, after checking with the wire rope inspection apparatus 1, the abnormal location of the wire rope 2 can be discriminated easily.

  As described above, in the wire rope inspection apparatus 1 according to the embodiment, since the abnormal part specifying unit 53 of the control unit 50 specifies an abnormal part from the tomographic image of the tomography unit 40, the wire cannot be specified only by the appearance. An abnormality inside the rope 2 can be detected. For example, the presence or absence of abnormality can be detected for each of the strands 3 and the strands 5 of the wire rope 2. As a result, the wire rope inspection device 1 can accurately determine whether or not the wire rope is abnormal.

  In the wire rope inspection device 1, the marking unit 60 performs marking at a location where it is determined that there is an abnormality in the wire rope 2. For this reason, it is possible to easily discriminate a portion determined to be abnormal on the wire rope 2 after inspection.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to said embodiment. In the embodiment, the marking unit 60 sprays the colored ink at a place where it is determined that the wire rope 2 is abnormal. However, the present invention is not limited to this. The marking unit 60 may mark colored ink at a location determined to be abnormal by the stamp. In this case, the marking unit 60 includes a stamp unit provided with a sponge soaked with colored ink, and the stamp unit 60 may be marked by being pressed against the wire rope 2.

  Further, the marking unit 60 may mark the colored ink at a location determined to be abnormal by a flexographic printing method using a printing roller.

  In said embodiment, the abnormal location specific | specification part 53 determines whether the wire rope 2 is worn from a tomographic image. However, in the present invention, as long as the abnormal part specifying unit 53 specifies the part where the wire rope 2 is abnormal based on the cross-sectional image, the determination target of the abnormal part specifying unit 53 is arbitrary. For example, the abnormal location specifying unit 53 may obtain the flatness of the cross-sectional shape of the wire rope 2 from the tomographic image and determine whether the obtained flatness is greater than a reference value. Thereby, the abnormal location specific | specification part 53 can determine whether the wire rope 2 is flat, ie, the presence or absence of the collapse of the wire rope 2. FIG. Moreover, the abnormal part specific | specification part 53 specifies the position of the groove | channel 4 shown in FIG. 3 between the strand 3 and the strand 3 from a tomographic image, and twist amount of the strand 3 from the position of the groove | channel 4 specified from the other tomographic image. That is, it may be determined whether the torsion amount is within an allowable range. Thereby, the abnormal location specific | specification part 53 can determine whether it is the state in the range in which the kink of the wire rope 2 is accept | permitted. The abnormal location specifying unit 53 may determine the presence / absence of a location where the strand 5 is not present in the strand 3 from the tomographic image with respect to the multiple strands 5 constituting each strand 3. And the abnormal location specific | specification part 53 may count the number of the locations which do not have the strand 5, and may determine whether the number of the counted locations is larger than a predetermined number. Thereby, the abnormal location specific | specification part 53 can determine whether the disconnection of the wire rope 2 is a disconnection in a tolerance | permissible_range. In addition, the reference value mentioned above should just be a thing according to an inspection item.

  In the above embodiment, the wire rope inspection device 1 is interlocked with the sheave 120 at the rear of the crane 100. However, the present invention is not limited to this. As long as the wire rope 2 can be wound around the rollers 20A and 20B, the installation location of the wire rope inspection device 1 is arbitrary. For example, you may install in the boom head of the crane 100. FIG.

  In said embodiment, the wire rope inspection apparatus 1 is checking the wire rope 2 at the time of winding-down work. However, the present invention is not limited to this, and the wire rope inspection device 1 may inspect the wire rope 2 during the winding operation by changing the direction of the wire rope inspection device 1 and installing it.

DESCRIPTION OF SYMBOLS 1 Wire rope inspection apparatus 2 Wire rope 3 Strand 4 Groove 5 Elementary wire 10 Case 11, 12 Through-hole 20A, 20B Roller 30 Speed measurement part 40 Tomography part 41 X-ray source 42 X-ray detector 43 Rotation drive mechanism 50 Control Section 51 Speed calculation section 52 Tomographic image generation section 53 Abnormal point identification section 54 Marking instruction section 60 Marking section 100 Crane 110 Winch drum 120 Sheave D direction

Claims (3)

A speed measuring unit that measures the moving speed of the wire rope that moves by winding or unwinding the winch;
A tomography unit for imaging the tomography of the wire rope;
Generating a cross-sectional image of the wire rope from the tomographic image captured by the tomography unit, and identifying an abnormal location identifying unit that identifies a location where the wire rope is abnormal based on the cross-sectional image;
Based on the moving speed measured by the speed measuring unit, a marking unit that specifies and marks the location of the wire rope that the abnormal location specifying unit has determined to be abnormal,
A wire rope inspection device. The tomography unit continuously images the wire rope moving by winding or unwinding the winch,
The abnormal part specifying unit generates a continuous cross-sectional image from a tomogram obtained by continuous imaging by the tomographic imaging unit, and the wire rope has an abnormality based on the generated continuous cross-sectional image Identify the location,
The wire rope inspection device according to claim 1. The wire rope inspection device according to claim 1 or 2,
crane.

Images