JPH1010060A - X-ray inspection device for handrail for man conveyor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an X-ray inspection device for a man conveyor handrail which can accurately detect on-site the damage to a steel cord embedded in the handrail. SOLUTION: A handrail 1 for a lower horizontal part is removed from a handrail guide 45, and an X-ray inspection device is installed on the exposed handrail guide 45 by a holding device 49 in such a way that it can travel along the handrail guide 45, while a connecting metal fitting 12 coupling upper and lower main bodies 10, 11 together is released. Then the upper main body 10 is inclined counterclockwise about a hinge 24, and as the handrail 1 is inserted between time upper and lower main bodies 10, 11 in such a way that the handrail 1 is located in the opposed space part of the upper main body 10 in which a plurality of strip shields 16 are placed, the upper main body 10 is restored to its original position and coupled to the lower main body 11 by the connecting metal fitting 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an X-ray flaw detector for a handrail for a man conveyor for detecting damage to a steel cord embedded in the handrail.

[0002]

2. Description of the Related Art In general, in a man conveyor such as an escalator, a handrail is provided which moves in the same direction in synchronization with a step of carrying a passenger, and the passenger is prevented from falling by being caught by the handrail during traveling. This handrail may be out of synchronization with the steps due to temperature fluctuations, long-term use, etc., which may cause the rubber that composes the handrail to stretch and lose its tension. The steel cord is embedded in the steel cord, but if the steel cord is used for a long period of time, the steel cord breaks due to metal fatigue due to bending or the like.

Therefore, in order to detect damage to a steel cord, as described in JP-A-6-316394,
There has been proposed a handle checker having exciting means for magnetizing a steel cord embedded in a handrail in a traveling direction, and a detecting coil for detecting leakage magnetic flux generated from a damaged portion of the steel cord magnetized by the exciting means. I have. When the steel cord in the handrail is magnetized in the traveling direction, if the steel cord is damaged, a leakage magnetic flux is generated from the damaged portion, and the leakage magnetic flux can be detected by the detection coil. It is also conceivable to use an X-ray flaw detector which determines the degree of damage by irradiating X-rays from outside the handrail to photograph the state of the steel cord in the handrail and observing the film after photographing.

[0004]

However, in the conventional handle checker, even if the presence or absence of damage can be accurately detected, whether the damage requires replacement of the handrail at an early stage, or the possibility of handrail replacement in the future. It was not possible to accurately detect whether replacement was necessary. On the other hand, the X-ray flaw detector can accurately detect the degree of flaw detection, but it takes time until the film is developed, and it is not possible to make an immediate judgment by inspecting the handrail on the spot. Was.

An object of the present invention is to provide an X-ray flaw detector for a handrail for a man-conveyor, which can accurately detect on-site damage of a steel cord embedded in the handrail.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention comprises a handrail guided by a handrail guide, and detects a damage of a steel cord in the handrail by an X-ray flaw detector. In the X-ray flaw detector for a conveyor handrail, the X-ray flaw detector includes an X-ray generator and an X-ray generator arranged via a predetermined facing space.
The X-ray flaw detector is supported by the handrail guide from which the handrail is removed, and the X-ray detector is provided between the X-ray generator and the X-ray receiver. The handrail detached from the handrail guide is arranged in the facing gap.

An X-ray flaw detector for a handrail for a conveyor according to the present invention uses an X-ray flaw detector capable of performing high-precision flaw detection as described above. Since the device is supported and the handrail removed from the handrail guide is arranged in the facing gap between the X-ray generating unit and the X-ray image receiving unit of the X-ray flaw detector, the X-ray image can be received without dismantling the handrail from the man conveyor. The status of the steel cord in the handrail can be displayed on the part, and can be verified on the spot easily and quickly.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are a front view and a side view, respectively, in which only the upper part of the X-ray flaw detector according to one embodiment of the present invention is cut away. The X-ray flaw detector 9 includes a lower main body 11 containing an X-ray generating unit 8 including an X-ray tube 17 and a flyback transformer 18 and an X-ray image receiving unit 14 including an X-ray display unit 14A and an X-ray emitting unit 14B. Upper body 1 containing
0, both of which are connected by hinges 24 at two locations on the back. On the front surface corresponding to the hinge 24, a connection fitting 12 for releasably connecting the two is provided.
A pair of engaging portions 22A, 2
2B, an operation unit 21 that drives the device in a direction to contact and separate the 2B,
A supporting device 48 is constituted by the rotatable roller 19 located above the engaging portions 22A and 22B. On one side of the X-ray flaw detector 9, there is a grip 25 used for carrying, and on the opposite side, a plurality of rubber stands 26 used for storage are attached. In the center of the lower end of the upper body 10, an opposing space portion into which a handrail is inserted is formed, and a plurality of shields 16 formed on a strip to give followability are arranged at the entrance and the exit, respectively. .

FIG. 3 is a circuit diagram of the X-ray generator 8 in the lower main body 11. A charger 40 connected to a commercial power supply is connected to a battery 32, an operation switch 41 and a coil 30 of a relay are connected in series with the battery 32, and a contact 31 that closes and self-holds when the coil 30 is excited.
Is connected in parallel with the operation switch 41. A timer 33 composed of a subtraction counter can set the time by a setting device 34. The timer 33 has a normally closed contact 33S.
The normally closed contact 33S is instantaneously opened at the end of counting by the timer 23 to cut off the power supply circuit. The count value of the timer 33 can be displayed according to the remaining time display 35. An excitation circuit 36 composed of an inverter switching circuit and the like, a semi-high voltage circuit 37 composed of a flyback transformer 18 and the like, and a high voltage generation circuit 38 composed of a voltage doubler adjusting circuit using a capacitor and the like are connected in series to the battery 32 via a timer 33. Have been. A variable resistor 3 is provided between the cathode side of the X-ray tube 17 and the battery 32.
9 is connected, and X-rays 1 radiated from the X-ray tube 17
The solid angle of 7X is about 40 degrees.

When the operation switch 41 is turned on, the coil 30
Is excited, and the contact 31 is closed to be self-held. At the same time, the timer 33 operates, and a set time, for example, 1
The remaining time is displayed on the remaining time display 35 for 20 to 180 seconds. In this state, the voltage of the battery 32 is
A voltage of 300 V is applied to the excitation circuit 36 via the coil 30 and the contact 33 S of the timer 33, is converted into an alternating current, and is input to the semi-high voltage circuit 37. This high pressure is converted to X
The X-ray tube 17 applies a soft X-ray 17X of 20 Kev to the anode of the X-ray tube 17. When the remaining time of the timer 33 becomes 0, the contact 33S is momentarily opened, the coil 30 is demagnetized, the self-holding state is released, and the contact 31 is opened.
The application of the voltage to the X-ray generation unit is stopped, and the emission of the X-ray 17X is stopped. The current breaker 1 is provided in the lower body 11.
9 is provided, the upper body 10 is opened,
Is released, the current breaker 19 is activated and the power supply circuit is immediately cut off. When the X-rays 17X are irradiated even after the set time, the power can be cut off by an operation switch of the X-ray flaw detector 9 (not shown), or a buzzer 32 can be provided by providing a detection circuit.

An X-ray image receiving section 14 is formed in the upper main body 10 shown in FIG. The X-ray image receiving unit 14 includes a sheet glass positioned on the X-ray tube 17 side and X-rays coated thereon.
It has an X-ray display section 14A made of a line display film, and this X-ray display section 14A is made of cesium iodide (CaI), zinc sulfide (ZnS), and platinum barium cyanide (Ba [Pt
(CN) ₄ ], or cesium iodide (CsI), zinc sulfide (ZnS), and calcium tungsten tetroxide (CaWO ₄ ). These materials are sequentially thinned on the anti-X-ray generating portion side of the sheet glass. Or as a mixture of each material.
The X-ray emitting section 14B is applied with a photomultiplier tube voltage of 30,000 V to obtain a clear image. The outer peripheral portion of the X-ray image receiving unit 14 is surrounded by the X-ray shielding tube 13, and the upper part in the silent direction is shielded by the lead glass 15. Therefore, the X-rays 17X from the X-ray tube 17 described with reference to FIG. 3 reach the X-ray display section 14A of the X-ray image receiving section 14, and the material forming the X-ray display film is excited to efficiently convert the X-rays. To form an image by converting it into fluorescent light emission energy and heat energy.

At the time of actual use, as shown in FIG.
5 and the exposed handrail guide 45
The line flaw detector 9 is installed. Specifically, as shown in FIG. 10, the connection fitting 12 connecting the upper main body 10 and the lower main body 11 is released, and the upper main body 10 is pivoted around the hinge 24.
Is tilted counterclockwise, and the handrail 1 is inserted between the upper main body 10 and the lower main body 11 so that the handrail 1 is located in the space facing the upper main body 10 in which the plurality of strip-shaped shields 16 are arranged. , Returning the upper body 10 to the connection fitting 1
2 couples to the lower body 11. Along with this work,
The X-ray flaw detector 9 is installed so as to be able to travel along the handrail guide 45 by a holding device 48 provided below the lower main body 11. That is, the X-ray flaw detector 9 is arranged by positioning the roller 19 on the handrail guide 45, and the operation unit 21
When the handrail guide 45 is sandwiched between the pair of engaging portions 22A and 22B while supporting the X-ray flaw detector 9, the X-ray flaw detector 9 is moved while the roller 19 is rolling. Can be run along. After the handrail 1, which is the object to be inspected, is arranged between the X-ray generator 8 and the X-ray image receiver 14, the X-ray generator 8
When irradiated with X-rays, the steel cord 1B embedded in the X-ray image receiving portion 14 is transmitted through the handrail 1 and the presence or absence and degree of damage can be observed in detail.

In order to use such an X-ray flaw detector 9 efficiently, it is preferable to use it together with the handle checker 6 shown in FIGS. First, this handle checker 6
4 and 5, which are a front sectional view and a side sectional view, a substantially E-shaped detector 4 has a permanent magnet 5 serving as an exciting means at its open end facing the handrail 1.
A and 5B, and opposed detection pieces 4a and 4b are provided at the center thereof with an interval Y, and opposed detection coils Ka and Kb are wound around the opposed detection pieces 4a and 4b, respectively. Output terminals a and b are taken out by connecting in series.

Now, when the handle checker 6 is installed on the handrail 1, the steel cord 1B of the handrail 1 is excited in the longitudinal direction by the main magnetic flux Φ0 by the permanent magnets 5A and 5B. At this time, since a plurality of steel cords 1B inside the handrail 1 are arranged side by side as shown in FIG. 2, the width X of the steel cords 1B arranged side by side as shown in FIG. 3 is evenly excited. . At this time, if the steel cord 1B is in a normal state, no leakage magnetic flux is generated and there is no detection by the opposing detection pieces 4a and 4b. On the other hand, if the steel cord 1B is damaged by breakage or the like, a magnetic circuit is formed in the plurality of steel cords 1B in the longitudinal direction by the main magnetic flux Φ0, and leakage magnetic flux is generated from a damaged portion such as disconnection. This leakage magnetic flux is detected by the opposing detection pieces 4a and 4b of the detection body 4. An indicator meter is connected to the output terminals a and b to display the occurrence of abnormal magnetic flux leakage, and an alarm buzzer is connected to sound the alarm buzzer when the magnetic flux leakage exceeds a predetermined value. I have. A recording device was connected to the output terminals a and b, and the steel cord 1 was broken as shown in FIG.
The detection result of B may be recorded on the recording chart paper 8, and the peak 1D of the waveform on the recording chart paper 8 in this case corresponds to the broken portion of the steel cord 1B. Since the steel cord 1B may spread in the width direction when the wire breaks or peels off from the rubber, the opposite detection pieces 4a and 4b of the detector 4 are made larger than the width dimension X of the steel cord 1B to detect damage. In order to improve the detection sensitivity and the detection accuracy by widening the width of the counter detection pieces 4a and 4b formed in the traveling direction to be 5 mm or less, the above-described leakage magnetic flux can be efficiently detected. it can.

Next, the flaw detection work of the handrail for the man conveyor will be described with reference to the flowchart shown in FIG.
First, step S1 detects the state of the steel cord 1B embedded in the handrail 1 using the handrail checker 6 as a first flaw detection step. The handrail 1 of the man conveyor is driven by the driving pulley 2 as shown in FIG. 7, and is moved in the same direction in synchronization with the step 3 so that the passenger riding on the step 3 does not fall down. The handrail 1 is configured by embedding a plurality of steel cords 1B in the axial direction as shown in a sectional view of FIG. As shown in FIG. 7, the handrail checker 6 is mounted on the handrail 1 of the man conveyor, and the handrail 1 is inspected for flaws during operation of the man conveyor. If the steel cord 1B is damaged, the handrail checker 6 described above is used as shown in step S2.
The leakage magnetic flux is detected according to the principle described above, and an abnormal portion is notified by a display or a buzzer. At this time, the location corresponding to the abnormality of the handrail 1 is marked with a tape or the like as shown in step S3, and the handrail 1 is marked as shown in step S4.
When the output waveform of the handrail checker 6 at the location corresponding to the abnormality, for example, the waveform of the recording chart paper 8 shown in FIG. 9 is observed, and the peak is determined to be abnormal because it exceeds a predetermined value, the process proceeds to step S5. The flaw detection by the X-ray flaw detector 9 is performed as a second flaw detection step.

This is performed based on step S5. As shown in FIG. 11, the lower horizontal handrail 1 is detached from the handrail guide 45, and the X-ray flaw detector 9 is installed on the exposed handrail guide 45. I do. Specifically, as shown in FIG. 10, the connection fitting 12 connecting the upper main body 10 and the lower main body 11 is released, and the upper main body 10 is tilted counterclockwise about the hinge 24, thereby forming a plurality of strips. The upper body 1 is inserted while the handrail 1 is inserted between the upper body 10 and the lower body 11 so that the handrail 1 is located in a space facing the upper body 10 in which the shield 16 is disposed.
Returning to 0, it is connected to the lower body 11 by the connection fitting 12. Along with this work, as shown in step S6, the X-ray flaw detector 9 is held by the holding device 48 formed below the lower main body 11.
Is installed so as to be able to travel along the handrail guide 45. This is achieved by disposing the X-ray flaw detector 9 with the roller 19 positioned on the handrail guide 45 as shown in FIG.
The X-ray flaw detector 9 is supported by sandwiching the handrail guide 45 between 22B. This pinching is performed by rotating the roller 19 and moving the X-ray flaw detector 9 to the handrail guide 4.
5, the position is selected such that the handrail 1 at the position marked in step S3 is located in the X-ray flaw detector 9. If the pinching by the engaging portions 22A and 22B prevents the movement of the X-ray flaw detector 9, the operating portion 21 is operated to operate the engaging portion 22.
After slightly loosening the space between A and 22B, the X-ray flaw detector 9 is moved, and then the operation unit 21 is operated again to operate the pair of engagement portions 22.
The X-ray flaw detector 9 may be supported by interposing the handrail guide 45 between A and 22B.

In this state, as shown in step S7, X
The power of the X-ray flaw detector 9 is turned on, and the X-ray flaw detector 9 is finely adjusted so as to correspond to the damaged portion of the steel cord 1B of the handrail 1 while observing the X-ray image receiving unit 14 from above the X-ray flaw detector 9. . This adjustment does not require moving the handrail 1. In other words, since the X-ray flaw detector 9 is movably supported on the lower horizontal part of the handrail 1, the marked position of the handrail 1 should be located on the lower horizontal part before the X-ray flaw detector 9 is installed. By simply moving the X-ray flaw detector 9 along the handrail guide 45, it is possible to easily cope with the problem. If the positional relations correspond to each other, a VTR or a polaroid camera is attached to the X-ray flaw detector 9 as shown in step S9, and the X-ray image receiving unit 14 is photographed and recorded. At this time, the handrail checker 6
Unlike the above, the degree of damage to the steel cord 1B can be clearly understood only by looking into the X-ray image receiving unit 14 of the X-ray flaw detector 9, so that it is possible to accurately and immediately determine whether the steel cord 1B should be replaced or not in the future. can do. In addition, since the damage position is grasped in advance by the handrail checker 6, the operation time of the X-ray flaw detector 9 can be shortened, which is extremely safe. Thereafter, the power of the X-ray flaw detector 9 is turned off as shown in step S10, the X-ray flaw detector 9 is removed from the handrail guide 45 as shown in step S11, and the handrail 1 is moved to the handrail guide as shown in step S12. 45, and the work is completed.

The handrail flaw detection method described above includes a first flaw detection step of detecting a damage position by the handrail checker 6, a step of marking when the first flaw detection step detects the damage position, and a step of marking the marked position. Of the handrail checker 6 used in the first flaw detection process.
Is not limited to the above-described method, but can be performed by a device other than the X-ray flaw detector 9.

FIG. 12 shows X according to another embodiment of the present invention.
The line flaw detector 9 is shown. The X-ray flaw detector 9 is configured by connecting the upper main body 10 and the lower main body 11 so as to be openable and closable by a connecting device such as a connecting fitting 12 or a hinge 24. However, the upper main body 10 and the lower main body 11 are formed into a U-shape. The insertion part of the handrail 1 is formed integrally in the U-shaped opposed space portion, and the periphery thereof is shielded as necessary by an X-ray shield 46 having a strip shape and giving followability. I have. According to such a configuration, after supporting the X-ray flaw detector 9 on the handrail guide 45, the handrail 1 can be arranged at a predetermined position simply by inserting the handrail 1 into the U-shaped opposed space. Workability is improved. Other configurations in the upper main body 10 and the lower main body 11 are the same as those in the above-described embodiment.
Equivalent components have the same reference characters allotted, and description thereof will not be repeated.

[0020]

As described above, the X-ray flaw detector for a handrail for a conveyor according to the present invention employs an X-ray flaw detector capable of performing high-precision flaw detection. Supports X-ray flaw detector, X
Since the handrail removed from the handrail guide is arranged in the opposing gap between the X-ray generating unit and the X-ray receiving unit of the X-ray flaw detector, the handrail is moved to the X-ray receiving unit without dismantling the handrail from the man conveyor. The condition of the steel cord in the rail can be projected and verified on the spot easily and quickly.

[Brief description of the drawings]

FIG. 1 is a cross-sectional front view of an upper part of an X-ray flaw detector according to an embodiment of the present invention.

FIG. 2 is a side view of the X-ray flaw detector shown in FIG.

FIG. 3 is a circuit diagram showing an X-ray generation unit of the X-ray flaw detector shown in FIG.

FIG. 4 is a front sectional view of the handle checker.

FIG. 5 is a side sectional view of the handle checker shown in FIG. 4;

FIG. 6 is a flowchart showing a flaw detection operation using the X-ray flaw detector shown in FIG. 1;

FIG. 7 is a side view of the man conveyor showing a use state of the handle checker shown in FIG.

8 is a sectional view of a handrail of the man conveyor shown in FIG. 7;

FIG. 9 is a plan view of a recording chart paper showing a flaw detection result by the handle checker shown in FIG. 3;

FIG. 10 is a side view showing a state in which the X-ray flaw detector shown in FIG. 1 is being mounted.

11 is a side view of the man conveyor showing a use state of the X-ray flaw detector shown in FIG. 1;

FIG. 12 is a perspective view showing an X-ray flaw detector according to another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Handrail 1B Steel cord 9 X-ray flaw detector 10 Upper main body 11 Lower main body 14 X-ray receiving part 17 X-ray tube 45 Handrail guide 48 Supporting device

Claims (4)

[Claims] 1. An X-ray flaw detector for a handrail for a man-conveyor, comprising a handrail guided by a handrail guide, wherein flaw detection of a steel cord in the handrail is detected by an X-ray flaw detector. The apparatus has an X-ray generation unit and an X-ray image receiving unit arranged via a predetermined facing space, and supports the X-ray flaw detection device on the handrail guide from which the handrail is removed,
X-ray inspection of a handrail for a man-conveyor, wherein the handrail detached from the handrail guide is arranged in the opposed space between the X-ray generation section and the X-ray image receiving section of the X-ray inspection apparatus. apparatus. 2. The X-ray flaw detector according to claim 1, wherein the X-ray flaw detector includes a lower main body containing the X-ray generation unit, an upper main body containing the X-ray image receiving unit, and an opposing portion between the two main bodies. The opposed space formed in the above, provided a connecting portion that connects the lower body and the upper body in a separable manner, and the handrail removed from the handrail guide in the opposed space when the connecting portion is opened. A handrail X-ray flaw detector for a man conveyor, which is arranged. 3. The X-ray flaw detector according to claim 1, wherein the X-ray flaw detector integrally includes a lower body accommodating the X-ray generator and an upper body accommodating the X-ray image receiver in a substantially U-shape. An X-ray flaw detector for a handrail for a man conveyor, comprising: 4. The X-ray flaw detector for a man-conveyor handrail according to claim 1, wherein the X-ray flaw detector is supported so as to be able to run along the handrail guide.