JP6717411B2 - Conveyor belt inspection equipment - Google Patents

Description

The present invention relates to a conveyor belt inspection device.

Provided is a conveyor belt used in a conveyor belt device for carrying an object to be conveyed, which includes a reinforcing layer having a plurality of steel cords arranged at intervals and a rubber layer covering the reinforcing layer. ..
In the manufacturing process of such a conveyor belt, it is necessary to measure the dimension related to the position of the steel cord.
As such dimensions, for example, a cord pitch which is a space between steel cords, a distance between both cords which is a space between steel cords located at both ends in the width direction of the conveyor belt, a width direction end face of the conveyor belt is adjacent to the end face. The ear rubber width, which is the distance to the outer peripheral surface of the steel cord, may be used.
Conventionally, these dimensions are manually measured by using a caliper or a ruler in a cross section located at both ends in the longitudinal direction of the conveyor belt after the manufacture of the conveyor belt is completed.
Therefore, during the manufacture of the conveyor belt, it is not possible to measure the dimensions of the intermediate portion of the conveyor belt in the longitudinal direction, and there is a need for improvements in measuring the dimensions of the conveyor belt.

On the other hand, in Patent Document 1, a rubber material in which a steel cord is embedded is irradiated with X-rays, the transmitted X-rays are applied to a fluorescent plate to form a visible image, and the visible image is picked up by a camera. An apparatus for detecting the arrangement state of codes has been proposed.
Further, in Patent Document 2, the conveyor belt is irradiated with X-rays, the transmitted X-rays are detected by a line sensor extending in a direction orthogonal to the extending direction of the steel cord, and an X-ray transmission image is created. An apparatus has been proposed that determines the thickness of a rubber layer based on the brightness of an X-ray transmission image.

JP 62-143252A JP, 2005-81857, A

However, in the former device, there is room for improvement in securing measurement accuracy because a visible image is captured via the fluorescent plate.
The latter device does not measure the thickness of the rubber layer, but measures the cord pitch, the distance between the cords at both ends, and the ear rubber width, which are dimensions related to the position of the steel cord.
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a conveyor belt inspection device that is advantageous in accurately inspecting the dimensions related to the position of the steel cord.

In order to achieve the above-mentioned object, the present invention provides a reinforcing layer having a plurality of steel cords arranged at intervals, and a rubber layer covering the reinforcing layer, in the thickness direction of a conveyor belt. An inspection apparatus for a conveyor belt , comprising: an X-ray generator arranged at a location distant from the conveyor belt and irradiating a conical X-ray whose diameter gradually expands toward a plane including the plurality of steel cords. The X-ray generator stores the X-ray source that generates the conical X-rays, and stores the X-rays generated from the X-ray source from the X-ray source in the vicinity of the conveyor belt. And a case that shields the X-rays generated from the X-ray source at a location of the case facing the conveyor belt in a strip shape along the extending direction of the steel cord with respect to the conveyor belt. It is characterized in that a slit for irradiation is provided .
Also, in the present invention, the conveyor belt is arranged on a horizontal plane, the X-ray generator is arranged above the conveyor belt, and the case includes a case main body for accommodating the X-ray source and a case main body. A shield cylinder attached to a lower portion and extending downward from the case body is provided, and the shield cylinder faces a pair of side surfaces facing each other in a longitudinal direction of the conveyor belt and a width direction of the conveyor belt. It has a pair of end faces and a bottom face connecting the lower ends of the pair of side faces and the lower ends of the pair of end faces, and the cross section where the dimension between the pair of end faces is larger than the dimension between the pair of side faces has an elongated rectangular shape. It has a shape, and the slit is formed on the bottom surface in an elongated shape along the longitudinal direction of the conveyor belt.
Further, the present invention is arranged on the other side of the thickness direction of the conveyor belt, extends along the extending direction of the steel cord, detects the X-ray transmitted through the conveyor belt, and outputs an X-ray transmission signal. An X-ray line sensor for generating is further provided, and a width of the slit in a direction orthogonal to the extending direction is 1 mm or more and 3 mm or less, and a length in the extending direction of the slit is from the slit to the plane of the conveyor belt. It is characterized in that the length of the irradiation region of the X-rays that are irradiated onto the X-rays is equal to or less than the length in the extending direction of the pixels of the X-ray line sensor.
In the present invention, the X-ray generator and the X-ray line sensor are arranged in a state where their relative positions are fixed, along a direction parallel to the plane and orthogonal to the extending direction of the steel cord. It is characterized in that it further comprises a moving unit for moving by moving.

According to the present invention, since X-rays generated from the X-ray source are shielded by the case, the worker's exposure dose can be suppressed even when the worker is in the vicinity of the inspection device. This can be secured, which is advantageous in improving work efficiency.

It is a front view showing the composition of the inspection device of the conveyor belt concerning an embodiment. FIG. 2 is a view on arrow A in FIG. 1. It is a perspective view of a shielding cylinder. It is a block diagram showing the composition of the control system of the inspection device of the conveyor belt concerning an embodiment. It is an explanatory view of two-dimensional image information generated by the inspection device of the conveyor belt concerning an embodiment. It is sectional drawing explaining the dimension of each part of a conveyor belt. 3 is an operation flowchart of the conveyor belt inspection device according to the embodiment.

Embodiments of the present invention will be described below with reference to the drawings.
First, a conveyor belt that is inspected by the conveyor belt inspection apparatus according to the present embodiment will be described.
FIG. 6 is a sectional view of the conveyor belt taken along a plane orthogonal to the longitudinal direction.
The conveyor belt 10 is used for a belt conveyor device that conveys an object to be conveyed, for example, minerals such as iron ore, earth and sand, powder and the like.
The conveyor belt 10 is configured to include a reinforcing layer 12 and a pair of rubber layers 14A and 14B.
The reinforcing layer 12 is for holding the tension of the conveyor belt 10, extends in the longitudinal direction of the conveyor belt 10, and is arranged in parallel in the width direction of the conveyor belt 10 at intervals. The steel cord 16 is included.
The pair of rubber layers 14A and 14B respectively cover both surfaces in the thickness direction of the reinforcing layer 12, and are, for example, the upper rubber layer 14A forming a transfer surface on which the object to be transferred is placed and the opposite surface of the transfer surface. And a lower rubber layer 14B forming a surface.

When inspecting the conveyor belt 10, the following dimensions are measured.
(1) Cord pitch P: A distance between the centers of adjacent steel cords 16.
(2) Distance between cords at both ends B1: Distance between centers of steel cords 16 located at both ends in the width direction of the conveyor belt 10.
(3) Ear rubber width B2: A distance from the side surfaces 1002 on both sides in the width direction of the conveyor belt 10 to the outer peripheral surface of the steel cord 16 adjacent to the side surfaces 1002.
(4) Belt width B0: The distance between the side surfaces 1002 on both sides of the conveyor belt 10 in the width direction.
Among the above dimensions, the cord pitch P, the distance B1 between both ends cords, and the ear rubber width B2 are dimensions related to the position of the steel cord 16. The cord pitch P, the distance B1 between both ends cords, and the ear rubber width B2 are conventionally The measurement is performed using calipers or a ruler on both end faces of the conveyor belt 10 in the longitudinal direction.

Next, an inspection apparatus for the conveyor belt 10 according to the embodiment (hereinafter referred to as an inspection apparatus) will be described.
As shown in FIGS. 1 and 2, the inspection device 20 includes a carrier device 22, an X-ray generator 24, an X-ray line sensor 26, a first moving mechanism 28, a second moving mechanism 30, and a controller. And 32.

The conveyor 22 supports the conveyor belt 10 to be inspected so that at least a part in the longitudinal direction thereof has a plane 1602 including a plurality of steel cords 16 extending in a single plane, for example, a horizontal plane. At the same time, the conveyor belt 10 is conveyed along its longitudinal direction, in other words, along the extending direction of the steel cord 16.
The transport device 22 is configured to include, for example, a plurality of transport rollers 2202 on which the conveyor belt 10 is placed, a drive mechanism (not shown) that drives the transport rollers 2202, and the like.

The X-ray generator 24 is arranged on one side of the conveyor belt 10 in the direction orthogonal to the plane 1602 including the plurality of steel cords 16, in the present embodiment, and radiates the X-ray 34 toward the plane 1602. It is a thing.
The X-ray generator 24 includes an X-ray source 2402 that generates a conical X-ray 34 (a radiation beam), a collimator 2404 that limits the radiation angle of the X-ray 34 generated from the X-ray source 2402, and an X-ray 34. And a case 36 that shields the.
In the present embodiment, the case 36 includes a main body case 38 and a shield cylinder 40 attached to the lower portion of the main body case 38.
As shown in FIG. 2, the main body case 38 accommodates the X-ray source 2402 and the collimator 2404, and has a rectangular upper plate 3802, four side plates 3804 vertically extending from the four sides of the upper plate 3802, A lower plate 3806 that connects the lower ends of the four side walls 3804 is provided, and the lower plate 3806 is provided with a rectangular opening 3808.
As shown in FIGS. 2 and 3, the shielding cylinder 40 includes a rectangular bottom plate 4002 and four side plates 4004 standing upright from the four sides of the bottom plate 4002. The upper ends of the four side plates 4004 have a rectangular opening. It is 4006.
The shield tube 40 has a side plate 4004 of the shield tube 40 such that the opening 4006 of the shield tube 40 and the opening 3808 of the main body case 38 match their longitudinal direction with the central axis, and the openings 4006 and 3808 communicate with each other. Is attached to the lower plate 3806 of the main body case 38.
The bottom plate 4002 of the shielding cylinder 40 is provided with a slit 4010 that irradiates the conveyor belt 10 with the X-rays 34 emitted from the X-ray source 2402 in a strip shape along the extending direction of the steel cord 16.
The width W of the slit 4010 has a dimension of 1 mm or more and 3 mm or less that can be easily machined, and the length L of the slit 4010 is a band-shaped irradiation region of the X-ray 34 irradiated from the slit 4010 to the upper surface of the conveyor belt 10. The length of the X-ray line sensor 26 is formed to be equal to or less than the length of the pixel in the extending direction of the X-ray line sensor 26. Is designed to be as small as possible.

As shown in FIGS. 1 and 2, the first moving mechanism 28 causes the X-ray generator 24 to be parallel to the plane 1602 including the plurality of steel cords 16 and in a direction orthogonal to the extending direction of the steel cords 16, in other words. And is moved along the width direction of the conveyor belt 10.
In the present embodiment, the first moving mechanism 28 is configured to include a first rail 2802, a first table 2804, a first feed screw 2806, and a first motor 2808.
The first rail 2802 is attached to a frame (not shown) that is parallel to the plane 1602, extends in a direction orthogonal to the extending direction of the steel cord 16 when viewed from the direction orthogonal to the plane 1602.
The upper plate 3802 of the main body case 38 of the X-ray generator 24 is attached to the first table 2804, and the first table 2804 is slidably provided along the first rail 2802.
The first feed screw 2806 is screwed into the female screw of the first table 2804.
The first motor 2808 rotates the first feed screw 2806 forward and backward.
Therefore, when the first motor 2808 rotates forward and backward, the first table 2804 moves along the first rail 2802 via the first feed screw 2806, and the X-ray generation device 24 becomes a plurality of steel cords. It moves parallel to the plane 1602 including 16 and along a direction orthogonal to the extending direction of the steel cord 16.

The X-ray line sensor 26 is arranged on the other side of the conveyor belt 10 in the direction orthogonal to the plane 1602 including the plurality of steel cords 16 in the present embodiment, and extends along the extending direction of the steel cords 16. The X-ray 34 which is present and has passed through the conveyor belt 10 is detected to generate an X-ray transmission signal.
The X-ray line sensor 26 is configured by arranging pixels of a large number of light receiving elements that receive the X-rays 34 in a straight line. Therefore, the pixels of the large number of light receiving elements are arranged along the extending direction of the steel cord 16. Will be lined up.
The pixel pitch of the X-ray line sensor 26 is, for example, 0.2 mm, and the dimension between pixels of the light receiving elements located at both ends of the X-ray line sensor 26 in the longitudinal direction is, for example, 512 mm.

The second moving mechanism 30 causes the X-ray line sensor 26 to be parallel to the plane 1602 including the plurality of steel cords 16 and along the direction orthogonal to the extending direction of the steel cords 16, in other words, the width of the conveyor belt 10. It is to move along the direction.
In the present embodiment, the second moving mechanism 30 is configured to include the second rail 3002, the second table 3004, the second feed screw 3006, and the second motor 3008.
The second rail 3002 is attached to a frame (not shown) that is parallel to the plane 1602, extends in a direction orthogonal to the extending direction of the steel cord 16 when viewed from the direction orthogonal to the plane 1602.
The second table 3004 is slidably provided along the second rail 3002 and is attached to the X-ray line sensor 26.
The second feed screw 3006 is screwed into the female screw of the second table 3004.
The second motor 3008 rotates the second feed screw 3006 forward and backward.
Therefore, when the second motor 3008 rotates forward and backward, the second table 3004 moves along the second rail 3002 via the second feed screw 3006, and the X-ray line sensor 26 becomes a plurality of steel cords. It moves parallel to the plane 1602 including 16 and along a direction orthogonal to the extending direction of the steel cord 16.

As shown in FIG. 4, the control device 32 is composed of a personal computer, and includes a CPU, a ROM for storing/storing a control program, a RAM as an operating area of the control program, and an EEPROM for rewriting various data. , And an interface unit for interfacing with peripheral circuits and the like.
The controller 32 is connected to the transport device 22, the X-ray generator 24, the X-ray line sensor 26, the first motor 2808, the second motor 3008, and the display unit 42 that displays an image.
The controller 32 functions as the X-ray controller 32A, the transport controller 32B, the movement controller 32C, the two-dimensional image information generator 32D, and the measurement information detector 32E when the CPU executes the control program.

The X-ray controller 32A controls the X-ray generator 24 to irradiate the X-ray 34 from the X-ray generator 24.
The transport control unit 32B controls the transport device 22 to transport the conveyor belt 10 along the longitudinal direction thereof.

The movement control unit 32C controls the first movement mechanism 28 and the second movement mechanism 30, that is, by supplying a synchronized control signal to the first motor 2808 and the second motor 3008, thereby generating X-rays. The device 24 and the X-ray line sensor 26 are fixed in their relative positions in parallel with the plane 1602 and along the direction orthogonal to the extending direction of the steel cord 16 at a constant speed and a constant movement range. It is something to move.
Further, since the relative positions of the X-ray generator 24 and the X-ray line sensor 26 are fixed, as shown in FIG. 1, when viewed from the extending direction of the plurality of steel cords 16, the X-ray generator 24 is The irradiated X-rays 34 pass through the conveyor belt 10 in a direction orthogonal to the plane 1602 including the plurality of steel cords 16 and are detected by the X-ray line sensor 26.

In addition, the above-mentioned fixed movement range irradiates the conveyor belt 10 with the X-rays 34 from the X-ray generator 24 and covers the X-rays 34 transmitted through the conveyor belt 10 by X-rays over the entire length of the conveyor belt 10 in the width direction or more. The line sensor 26 is set to have a size sufficient to be detected by the line sensor 26.
Therefore, in the present embodiment, the movement control unit 32C, the first movement mechanism 28, and the second movement mechanism 30 constitute the movement unit in the claims.

The two-dimensional image information generation unit 32D takes in the X-ray transmission signal generated by the X-ray line sensor 26 and generates two-dimensional image information.
The two-dimensional image information generation unit 32D receives the two-dimensional image information based on the X-ray transmission signal captured every time the X-ray generator 24 and the X-ray line sensor 26 move by a unit amount equal to the pixel pitch of the X-ray line sensor 26. To generate. In the generation of the two-dimensional image information, various conventionally known image processings such as binarizing the X-ray transmission signal are used.
At this time, the two-dimensional image information generator 32D moves the X-ray generator 24 and the X-ray line sensor 26 based on the synchronized control signals supplied from the movement controller 32C to the first motor 2808 and the second motor 3008. Recognize quantity.
That is, when the X-ray 34 emitted from the X-ray generator 24 and transmitted through the conveyor belt 10 is detected by the X-ray line sensor 26, an X-ray transmission signal having a brightness corresponding to the intensity distribution of the X-ray 34 is generated. It is generated by the sensor 26.
Therefore, the brightness of the X-ray transmission signal is the lowest at the portion of the steel cord 16, and the brightness of the X-ray transmission signal is higher at the portions of the rubber layers 14A and 14B other than the steel cord 16 than at the portion of the steel cord 16. The brightness of the X-ray transmission signal is highest in the portion where there is no.

Therefore, as shown in FIG. 5, the image of the X-ray transmission signal is image-processed to generate an image of the conveyor belt 10 and the steel cord 16 as two-dimensional image information.
Further, as described above, the X-rays 34 emitted from the X-ray generator 24 are orthogonal to the plane 1602 including the plurality of steel cords 16 when viewed from the extending direction of the plurality of steel cords 16 in the conveyor. The X-ray 34 transmitted through the belt 10 and transmitted is detected by the X-ray line sensor 26 extending along the extending direction of the steel cord 16. Therefore, the distortion of the image of the conveyor belt 10 and the steel cord 16 generated as the two-dimensional image information is minimized, and the image of the conveyor belt 10 and the steel cord 16 in the two-dimensional image information can be obtained with high accuracy.

The measurement information detection unit 32E detects measurement information regarding the conveyor belt 10 and the steel cord 16 based on the two-dimensional image information.
Specifically, as shown in FIG. 6, the measurement information includes the cord pitch P, the both-end cord distance B1, the ear rubber width B2, and the belt width B0.
Further, the control device 32 displays and outputs the two-dimensional image information generated by the two-dimensional image information generation unit 32D and the measurement information detected by the measurement information detection unit 32E on the display unit 42.
Further, the control device 32 may print out the two-dimensional image information and the total measurement information by a printer device (not shown), or the two-dimensional image information and the total measurement information may be recorded on a recording medium (not shown). It may be recorded in.

Next, the operation and effect of the inspection device 20 will be described with reference to the flowchart of FIG.
First, the conveyor belt 10 to be inspected is placed on the transport device 22 (step S10).
Next, the controller 32 is operated to cause the X-ray generator 24 to irradiate the conveyor belt 10 with X-rays 34 (step S12: X-ray controller 32A).
At this time, the X-rays 34 radiated from the X-ray source 2402 pass through the collimator 2404 and the slit 4010 to radiate in a fan shape along the extending direction of the steel cord 16 as shown in FIGS. After passing through the conveyor belt 10, the X-ray line sensor 26 is reached.
In this state, the control device 32 controls the first moving mechanism 28 and the second moving mechanism 30 so that the X-ray generator 24 and the X-ray line sensor 26 are fixed in their relative positions. The steel cord 16 is moved parallel to the plane 1602 and in a direction orthogonal to the extending direction of the steel cord 16 at a constant speed for a certain range (step S14: moving unit).
Therefore, the X-rays 34 radiated in a fan shape are moved over the entire length of the conveyor belt 10 in the width direction at a constant speed in a predetermined range in a direction orthogonal to the extending direction of the steel cord 16.

The control device 32 generates two-dimensional image information based on the X-ray transmission signal captured every time the X-ray generation device 24 and the X-ray line sensor 26 move by a unit amount equal to the pixel pitch of the X-ray line sensor 26 ( Step S16: Two-dimensional image information generation unit 32D).
Next, the control device 32 detects the measurement information regarding the conveyor belt 10 and the steel cord 16 based on the obtained two-dimensional image information (step S18: measurement information detection unit 32E).
Next, the control device 32 determines whether or not the inspection is completed over the entire length of the conveyor belt 10 (step S20).
If the inspection has not been completed, the control device 32 controls the transport device 22 so that the area adjacent to the area of the conveyor belt 10 where the two-dimensional image information has been generated does not have the two-dimensional image information generated yet. The conveyor belt 10 is conveyed so that the line 34 can be irradiated (step S22: conveyance controller 32B).
Then, the process returns to step S12 and the same processing is repeated.
If the result at step S20 is affirmative, the control device 32 ends the inspection and outputs the inspection result, which is the two-dimensional image information and the measurement information, to the display unit 42, or prints it out and records it on a recording medium. Perform processing.

As described above, according to the present embodiment, when viewed from the extending direction of the plurality of steel cords 16, the X-rays 34 emitted from the X-ray generator 24 are applied to the plane 1602 including the plurality of steel cords 16. The X-rays 34 that have passed through the conveyor belt 10 in a direction orthogonal to each other are detected by the X-ray line sensor 26 that extends along the extending direction of the steel cord 16. Thereby, the distortion of the image of the conveyor belt 10 and the steel cord 16 generated as the two-dimensional image information is suppressed to the minimum. Therefore, the images of the conveyor belt 10 and the steel cord 16 in the two-dimensional image information can be obtained with high accuracy.
Therefore, it is advantageous in accurately obtaining measurement information regarding the conveyor belt 10 and the steel cord 16 at any portion in the longitudinal direction of the conveyor belt 10, and is advantageous in finely assuring the quality of the conveyor belt 10.
Further, unlike the conventional case, the inspection is not limited to the stage when the manufacture of the conveyor belt 10 is completed, and the in-line inspection can be performed in the manufacturing process. Therefore, when a defect is detected during the manufacture of the conveyor belt 10, the manufacturing process can be immediately stopped to take measures against the defect, which is advantageous in suppressing the manufacturing cost of the conveyor belt 10.

Further, according to the present embodiment, the two-dimensional image information generation unit 32D generates the two-dimensional image information by using the X-ray generator 24 and the X-ray line sensor 26 in a unit amount equal to the pixel pitch of the X-ray line sensor 26. Since it is performed based on the X-ray transmission signal captured every time it moves, two-dimensional image information can be obtained with a resolution equivalent to the pixel pitch of the X-ray line sensor 26, which is more advantageous for accurate inspection. ..

Further, according to the present embodiment, since the cord pitch P, the distance between the cords at both ends B1, the ear rubber width B2, and the belt width B0 can be obtained as the measurement information, the quality assurance of the conveyor belt 10 can be performed finely. It will be more advantageous.

Further, according to the present embodiment, the X-ray generator 24 includes a case 36 that houses the X-ray source 2402 and shields the X-rays 34 generated from the X-ray source 2402, and the case 36 is the X-ray source. A slit 4010 is provided to irradiate the conveyor belt 10 with X-rays 34 generated from 2402 in a strip shape along the extending direction of the steel cord 16.
Therefore, since the X-rays 34 generated from the X-ray source 2402 are shielded by the case 36, the worker's exposure dose can be suppressed even when the worker is in the vicinity of the inspection device 20, so that the worker's working time is extended. This can be secured, which is advantageous in improving work efficiency.

In this embodiment, the X-ray generator 24 and the first moving mechanism 28 are arranged above the conveyor belt 10, and the X-ray line sensor 26 and the second moving mechanism 30 are arranged below the conveyor belt 10. I explained about the case.
However, contrary to the present embodiment, the X-ray generator 24 and the first moving mechanism 28 are arranged below the conveyor belt 10, and the X-ray line sensor 26 and the second moving mechanism 30 are arranged on the conveyor belt 10. Of course, it may be arranged above.

Further, in the present embodiment, the case where the first moving mechanism 28 and the second moving mechanism 30 are configured to move the tables 2804 and 3004 via the feed screws 2806 and 3006 by the motors 2808 and 3008 has been described.
However, the configurations of the first moving mechanism 28 and the second moving mechanism 30 are arbitrary, and there are various conventionally known moving mechanisms such as a direct-acting electric actuator using a linear mower or a single-axis robot. Of course, it can be used.

Further, in the present embodiment, the case where the conveyor belt 10 is conveyed by the conveyor device 22 along the longitudinal direction thereof has been described.
However, instead of using the conveyor 22, the X-ray generator 24 and the X-ray line sensor 26 are fixed to the conveyor belt 10 with the relative positions thereof fixed. You may provide the moving mechanism which conveys along the longitudinal direction of.

10 Conveyor Belt 12 Reinforcing Layers 14A and 14B Rubber Layer 16 Steel Cord 1602 Plane 20 Inspection Device 22 Conveying Device 24 X-ray Generator 2402 X-ray Source 26 X-ray Line Sensor 32 Control Device 32A X-ray Control Unit 32B Conveyance Control Unit 32C Movement Control unit 32D Two-dimensional image information generation unit 32E Measurement information detection unit 34 X-ray 36 Case 38 Main body case 40 Shielding cylinder 4010 Slit P Code pitch B1 Distance between both ends cords B2 Ear rubber width B0 Belt width

Claims (4)

A reinforcing layer having a plurality of steel cords arranged at intervals from each other, and a conveyor belt including a rubber layer covering the reinforcing layer is arranged at a location apart from the conveyor belt in one of the thickness directions of the conveyor belt, and the plurality of A conveyor belt inspection device comprising an X-ray generator for irradiating a conical X-ray, the diameter of which gradually expands toward a plane including the steel cord of
The X-ray generator includes an X-ray source that generates the conical X-ray, and the X-ray generated from the X-ray source that is stored in the conveyor belt of the conveyor belt. With a case that shields up to the vicinity,
A slit for irradiating the conveyor belt with the X-rays generated from the X-ray source in a strip shape along the extending direction of the steel cord is provided at a position of the case facing the conveyor belt. ,
A conveyor belt inspection device characterized by the above. The conveyor belt is arranged on a horizontal plane,
The x-ray generator is arranged above the conveyor belt,
The case includes a case body that accommodates the X-ray source, and a shield tube that is attached to a lower portion of the case body and extends downward from the case body.
The shielding cylinder connects a pair of side surfaces facing each other in the longitudinal direction of the conveyor belt, a pair of end surfaces facing each other in the width direction of the conveyor belt, a lower end of the pair of side surfaces and a lower end of the pair of end surfaces. And a bottom surface that has a bottom surface, and a cross section in which the dimension between the pair of end surfaces is larger than the dimension between the pair of side surfaces has an elongated rectangular shape,
The slit is formed on the bottom surface in an elongated shape along the longitudinal direction of the conveyor belt,
The conveyor belt inspection device according to claim 1, wherein the inspection device is a conveyor belt inspection device. An X-ray line sensor arranged on the other side of the conveyor belt in the thickness direction, extending along the extending direction of the steel cord, and detecting the X-rays transmitted through the conveyor belt to generate an X-ray transmission signal. Further equipped with,
The width of the slit in the direction orthogonal to the extending direction is 1 mm or more and 3 mm or less,
The length of the slit in the extending direction is such that the length of the irradiation region of the X-rays irradiated from the slit to the plane of the conveyor belt is equal to or less than the length of the pixel of the X-ray line sensor in the extending direction. Is formed to have the dimensions of
The conveyor belt inspection device according to claim 1 or 2, wherein. A moving unit for moving the X-ray generator and the X-ray line sensor in a state where their relative positions are fixed, in parallel with the plane and along a direction orthogonal to the extending direction of the steel cord. To prepare further,
The conveyor belt inspection device according to claim 3, wherein the inspection device is a conveyor belt inspection device.

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