JPH1183765A - X-ray flaw detector for elevator cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an x-ray flaw detector for an elevator cable capable of performing efficient flaw detection in the cable. SOLUTION: A pulley 6 is provided for a bend part 2a formed at the lowest part of a cable 2 whose one end is connected to a passenger cage 1. An x-ray flaw detector 12 for a cable is supported by the pulley 6. By relatively moving the cable 2 between the x-ray generating part 9 and the x-ray image receiving part 10 of the x-ray detector 12, parts of the cable 2 susceptible to breakage in relation with the elevation of lowering of the passenger cage 1 are efficiently monitored.

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 cable of an elevator for inspecting a cable connected at one end to a car for disconnection or the like.

[0002]

2. Description of the Related Art In general, in elevators, a control device installed in a machine room and a car are connected by a cable to exchange signals. Since the maintenance engineer visually determined the presence or absence of a disconnection in the cable from the condition of the cable exterior, the disconnection and the like could not be reliably detected. In addition, even if it is determined that there is a possibility of disconnection, a test current can be applied to the removed cable or the cable can be connected to an X-ray device installed in a special room to confirm that the disconnection has actually occurred. Had to be brought in and an X-ray taken.

[0003]

However, in the conventional cable flaw detection method, a large amount of work is required to remove the cable, and the X-ray apparatus is large in size and can be easily carried to the site of the cable facility. Required considerable time and effort.

An object of the present invention is to provide an X-ray flaw detector for a cable of an elevator, which can efficiently detect a flaw in a cable.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a cable X-ray having an X-ray generating section and an X-ray receiving section for inspecting the inside of a cable having one end connected to a car. X-rays from the X-ray generation unit
In the X-ray flaw detector for a cable of a hoistway adapted to irradiate the X-ray image receiving part via the cable, the X-ray flaw detector for a cable is supported by a curved portion formed at the bottom of the cable. It is characterized by having done.

As described above, the X-ray flaw detector for a cable of an elevator according to the present invention supports the X-ray flaw detector for a cable in a curved portion formed at the lowermost portion of the cable. The cable relatively moves between the generating unit and the X-ray image receiving unit, and in particular, a portion that is easily broken to form a curved portion can be efficiently inspected with X-rays.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view showing an attached state of an X-ray flaw detector for cables of a lift according to an embodiment of the present invention. A cable connection box 4 is provided below the car 1 that is held up and down in the hoistway, and one end of the cable 2 is connected to the cable connection box 4. The cable 2 is suspended in a swingable state by a predetermined distance, and then rises upward and is connected to a cable connection box 3 provided at the limit position of the swing. A substantially U-shaped curved portion 2a is formed. The cable connection box 3 is fixed to a hoistway wall to support the other end of the cable 2 and connect the other end of the cable 2 to a control device in a machine room (not shown).

A support portion 5 is provided at a lower portion of the car 1 to support a portion of the cable 2 on the support portion 5 to protect a connection portion of the cable 2 in the cable connection box 4. The portion of the cable 2 that forms the lower curved portion 2a as the car 1 moves up and down differs, and the lower position of the cable 2 also changes, but the lower curved portion 2a formed at each position also changes.
A pulley 6 considering its radius of curvature is arranged so as to be able to roll with respect to the cable 2. The illustrated car 1 is located substantially at the lowest floor. When the car 1 rises above this, the car 1 moves to the cable 2 side of the half car, while rotating the pulley 6 clockwise, and the curved portion 2a is formed by the cable 2 on the half-ride car side, and the pulley 6 is raised together with the cable 2a. At the center of the pulley 6, there is a rotatable center shaft 6a, on which the cable X-ray flaw detector 12 is mounted. In particular,
A power supply 7 is connected via a shaft 6a.
The X-ray flaw detector 12 for cables, which includes an X-ray generator 9, an X-ray receiver 10, a CCD camera 11, and the like, is supported by a support member 8 provided by using an outer box or the like.

FIG. 2 is a perspective view showing the X-ray flaw detector 12 for a cable. Lower body 14 containing X-ray generator 9
And an upper main body 15 that houses the X-ray image receiving unit 10 and is formed of an X-ray protective lead glass material that is an X-ray shielding material, and an opposing portion between the X-ray generating unit 9 and the X-ray image receiving unit 10. The lower main body 14 and the upper main body 15 are formed such that a facing space for arranging the cable 2 to be inspected is formed. An outlet 13 connected to the power supply 7 is connected to the lower main body 14, and a current control volume 17, a high voltage control button 18, and an operation switch 41 for controlling the X-ray generation unit are arranged. On the other hand, the X-ray image receiving unit 10 can be directly viewed from above on the upper main body 15, but the CCD camera 11 is attached correspondingly. This CC
The D camera 11 is attached to the upper main body 15 and the support member 8 shown in FIG. 1 so that the distance between the D camera 11 and the X-ray receiving unit 10 can be adjusted. It has become so.

FIG. 3 is a vertical sectional front view of the X-ray flaw detector 12 for a cable. An X-ray generator 9 including an X-ray tube 17 and a flyback transformer 16 is housed in the lower body 11, and a circuit diagram of the X-ray generator 9 is shown in FIG. The battery 32 is provided with a charger 40 connected to a commercial power supply as necessary to constitute the power supply device 7, and the operation switch 41 and the relay coil 30 are connected in series with the battery 32.
The contact 31 that closes and self-holds when the coil 30 is excited is connected in parallel with the operation switch 41. An excitation circuit 36 including an inverter switching circuit and the like, a flyback transformer 1
8 and a high voltage generating circuit 38 including a voltage doubler adjusting circuit using a capacitor are connected in series. A variable resistor 39 is connected between the cathode side of the X-ray tube 17 and the battery 32. The variable resistor 39 is connected to the current control volume 14 shown in FIG. The battery 32
The CCD camera 11 is connected via the switch 3 and is used as a power source.

When the operation switch 41 is turned on, the coil 30
Is excited, and the contact 31 is closed to be self-held. In this state, the voltage of the battery 32 is applied to the excitation circuit 36 via the contact 31 and the coil 30, converted into AC, 300 V is input to the semi-high voltage circuit 37, boosted to the semi-high voltage circuit 37, and Is converted into a DC high voltage of 30,000 V, and this high voltage is applied to the anode of the X-ray tube 17 and the X-ray tube 17 irradiates soft X-rays 17X of 20 KeV.

X-rays 17X emitted from the X-ray tube 17
The X-ray image receiving unit 10 in the upper main body 15 is configured as shown in FIG. The X-ray image receiving unit 10 includes a sheet glass located on the X-ray tube 17 side and X-rays applied thereon.
It has an X-ray display unit 21 made of a line display film, and this X-ray display unit 21 is made of cesium iodide (CaI), zinc sulfide (Zn).
S) and platinum barium cyanide (Ba [Pt (C
N)], or cesium iodide (CsI), zinc sulfide (ZnS) and calcium tungsten tetroxide (Ca
WO), and these materials are formed by applying each material in a thin layer form on the anti-X-ray generating portion side of the sheet glass, or by applying a mixture of each material. The X-ray emitting section 22 is applied with a photomultiplier voltage of 30,000 V to obtain a clear image. The outer peripheral portion of the X-ray image receiving section 10 is surrounded by an upper body 15 made of an X-ray protective lead glass material as an X-ray shielding material, and the upper viewing direction is shielded by a lead glass 23. The whole 15 may be made of an X-ray protective lead glass material.

As shown in FIG. 2, the lower body 14 has
L, M, and H three-stage high voltage control buttons 18 are provided.
The output of the X-ray receiving unit 10 can be adjusted to control the image on the X-ray image receiving unit 10, and a circuit configuration diagram of the unit is shown in FIG. Primary winding 33 of flyback transformer 16
On the other hand, terminals 34a, 34b, 34c corresponding to H, M, L are respectively derived from the secondary winding 34, and are configured to be switchably connectable to a common terminal 35. Connected to the anode side of tube 17.

Now, when inspecting the disconnection in the cable 2,
As shown in FIG. 1, a pulley 6 is disposed on the curved portion 2a, and supports a power supply device 7 and an X-ray flaw detector 12 for a cable. Then, while turning on the operation switch 41 of the X-ray flaw detector 12 for the cable and adjusting the current control volume 14 and the high voltage control button 15, the X-ray tube 1 described with reference to FIGS.
When the X-rays 17X are irradiated from the X-rays 7, the X-rays 17X pass through the cable 2 and reach the X-ray display unit 21 of the X-ray image receiving unit 10, where the material forming the X-ray display film is excited and the X-rays 17X are irradiated.
Is efficiently converted into fluorescent emission energy and heat energy to form an image. The image of the X-ray receiving unit 10 is photographed by a CCD camera 11 as shown in FIG.

When the car 1 shown in FIG. 1 is raised from the lowermost floor to the uppermost floor, the end of the cable 2 on the side of the car 1 is also raised, but the pulley 6 and the power supply 7 are substantially U-shaped. Of the cable 2 held by the bending portion 2a located at the lowermost portion of the cable 2 having a different moving amount. At this time, since the pulley 6 rotates clockwise, and the cable 2 moves to the half-riding car side at the portion forming the curved portion 2a, the X-ray of the cable X-ray flaw detector 12 held by the pulley 6 is moved. The cable 2 arranged between the line generating unit 9 and the X-ray image receiving unit 10 passes from the end of the car 1 and can be inspected continuously. In this way, most of the portion forming the curved portion 2a of the cable 2 as the car 1 moves up and down is changed to the cable X
Since the inspection can be performed by the line flaw detector 12, the curved portion 2
It is possible to efficiently monitor a portion where disconnection is likely to occur due to the formation of a.

In addition, since the X-ray image receiving unit 10 of the cable X-ray flaw detector 12 disposed in a narrow portion of the hoistway is not directly viewed, but is monitored via the CCD camera 11, the narrow portion is used. Instead, it can be placed in an appropriate room and transferred to a receiver to easily monitor the condition inside the cable 2.

In the above-described embodiment, the image taken by the CCD camera 11 is recorded on the VTR device in the power supply device 7. However, the wireless transmitter for transmitting the video signal to the CCD camera 11 wirelessly. 20 and a receiver having a wireless receiver corresponding to the wireless transmitter 20 is installed in a separate room, and at least one inspector visually observes the image with the CCD camera 11 while projecting the image on the receiver in another room. Then, the presence or absence of abnormality such as disconnection in the cable 2 can be confirmed. Further, in the above-described embodiment, the elevator in which the car 1 moves in the hoistway has been described, but the present invention can also be applied to a skew elevator. Furthermore, in the above-described embodiment, the X-ray flaw detector 12 for a cable is supported by the power supply 7 via the support member 8, but the X-ray flaw detector 12 for a cable is interposed between the power supply 7 and the cable 2. It may be arranged and supported by the central shaft 6 a of the pulley 6.

[0018]

As described above, the X-ray flaw detector for a cable of an elevator according to the present invention holds the X-ray flaw detector for a cable at a curved portion of a cable having one end connected to a car, and the X-ray generation unit is connected to the X-ray generator. Since the cable that moves relatively between the X-ray image receiving units is inspected, it is possible to efficiently monitor a portion of the cable that is easily broken.

[Brief description of the drawings]

FIG. 1 is a side view showing an attached state of a cable X-ray flaw detector of a lift according to an embodiment of the present invention.

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

FIG. 3 is a front view of the cable X-ray flaw detector shown in FIG. 2;

FIG. 4 is a circuit diagram of the X-ray flaw detector for cables shown in FIG. 2;

5 is a circuit diagram showing details of a main part of the X-ray flaw detector for cables shown in FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Riding car 2 Cave 2a Bending part 6 Pulley 7 Power supply device 8 Support member 9 X-ray generating part 10 X-ray receiving part 11 CCD camera 12 X-ray flaw detector for cables

Claims (3)

[Claims] In order to inspect the inside of a cable having one end connected to a car, an X-ray flaw detector for a cable having an X-ray generation unit and an X-ray image receiving unit is used. In the X-ray flaw detector for a cable of an elevator, which irradiates the X-ray image receiving portion via the cable,
An X-ray flaw detector for a cable of an elevator, wherein the X-ray flaw detector for a cable is supported on a curved portion formed at a lowermost portion of the cable. 2. The X-ray flaw detector for a cable of an elevator according to claim 1, wherein a CCD camera is arranged corresponding to the X-ray image receiving section. 3. The X-ray flaw detector for a cable of an elevator according to claim 1, wherein a pulley is provided on the curved portion, and the X-ray flaw detector for a cable is supported on a center axis of the pulley. .