JPH0286585A - Entangling detector of suspension tail cord for elevator - Google Patents

Abstract

PURPOSE:To prevent such a possibility that an elevator is operated in leaving a tail cord entangled intact, thereby giving damage to this tail cord and equipment, completely from occurring by installing a controller which discriminates a fact that a transmitting wave is received by waiting a proper time lag ranging from transverse wave signal wave transmittion to transverse wave reception as corresponding to suspension length of the tail cord varying together with an elevator cage going up and down. CONSTITUTION:A lateral signal wave out of a transmitter 11 is propagated in the longitudinal direction of a tail cord 4, and time lapse till it is received by a receiver 12 is determined by length and tension of the tail cord 4. Conse quently, if the tail cord 4 is entangled with equipment or the like in an elevator shaft in the midway, the lateral signal wave is reflected thereat, so that a time lag ranging from lateral signal wave emission to reflected wave reception becomes shorted. A fact that this time lag is abnormally shortened is discriminat ed by a controller 13, and an elevator operation range is further is extended while a warning signal is emitted by a proper means.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a device for detecting entanglement of suspension strips of an elevator, such as main ropes, weight compensation ropes, tail cords, etc.

[Conventional technology]

The main rope in high-speed elevators for skyscrapers.

Long strips such as weight compensation ropes, tail cords, governor ropes, etc. are suspended in a narrow and high elevator tower.

The natural frequency of the horizontal shaking of these strips is close to the natural frequency of the building's horizontal shaking, and the strips swing around greatly in the elevator tower by resonating with the shaking of the building during an earthquake or typhoon. It tends to get entangled with equipment inside the tower.

Since ascending and descending operations with entangled objects will damage the equipment inside the tower and the striations, the control operation system uses wave sensors to detect the shaking of the building and suspends operations when the shaking of the building exceeds a certain limit. is generally adopted.

Furthermore, since the strips continue to sway for quite a long time even after the shaking of the building has stopped, various systems have been proposed that use sensors to detect the shaking of the strips and stop the operation of the elevators.

When the control operation system is activated and the elevator operation is suspended, we want to resume operation as soon as possible, so we wait a little while after the sensor confirms that the shaking of the building and the structure has fallen below a certain level. Generally, the aircraft simply releases air traffic control and resumes operation.

If a suspension strip becomes entangled with equipment in the hoistway tower, it is not possible to release the operation control of the elevator just by confirming that the building and the strip have stopped shaking using the sensor mentioned above. This is dangerous because the basket may move up and down before it is undone.

The following is a known example of a plan to prevent accidents by interlocking the operation of an elevator by detecting that the strips are entangled.

``Elevator distribution cable abnormality detection device'' This is a device that supports the end of the strip by supporting it through an elastic body. This elastic body bends when the body is being dragged up by force, and by detecting this, the elevator is stopped.

In this case, fatal damage to the five-strip body can be prevented, but it is unavoidable that a certain amount of excessive force will be applied to the five-strip body.

[Problem to be solved by the invention]

An object of the present invention is to solve this problem by detecting that the strips are entangled before the elevator starts operating.

[Means to solve the problem]

A device for transmitting a transverse signal wave to the suspended strip is installed near one end of the strip, and! ! 1. A device for receiving a transverse wave signal wave of a vertical strip is installed near the above-mentioned transmitting device or near the other end of the strip, and transmits transverse waves corresponding to the suspension length of the strip, which changes as the cage of the elevator goes up and down. A control device is provided to determine that a transmitted wave is received with a reasonable time delay from signal wave transmission to transverse signal wave reception.

[Effect]

The earthquake control operation system is activated by a wave sensor that detects the shaking of the building, a sensor that detects the shaking of the strip, etc., and the operation of the elevator is suspended, but after a certain period of time has passed after the sensor stops working, permission is given to resume operation. A signal is issued.

At this time, a transverse signal wave is transmitted to the suspension strip from a transverse signal wave transmitter provided near one end of the suspension strip.

This transverse signal wave propagates longitudinally through the strip, reaches the other end, and is reflected there.

The reflected transverse signal wave propagates in the same direction and returns to the section where the transverse signal wave transmitting device is attached, where the transverse signal wave detecting device is installed.

Confirm that the transmitted transverse signal wave has returned.

The time it takes for this transverse signal wave to return is determined by the length and tension of the strip, and if the strip gets entangled with equipment inside the tower, the transverse signal wave will be reflected there, so the shear wave signal The time delay between wave emission and reflected wave reception becomes shorter.

A control device is provided that determines that the transmitted wave is received with a reasonable time delay from the transmission of the transverse signal wave to the reception of the transverse signal wave in response to the suspension length of the strip that changes as the cage of the elevator goes up and down. It is determined that this time delay is abnormally short, and the restart of operation of the elevator is further extended, and a warning signal is issued by appropriate means.

〔Example〕

In the embodiment shown in the figure, 1 is a cage, 2 is a main rope, 3 is a weight compensation rope, 4 is a tail cord, 5 is a hoist, 6 is a warping wheel, 7 is a counterweight, 8 is a pulley for a weight compensation rope, 9 is the fulcrum on the oil side of the tail cord, and 1o is the fulcrum on the tower side of the tail cord.

11 is a transverse signal wave transmitting device, 12 is a transverse signal wave receiving device, and 13 is a control device.

In the case of elevators installed in skyscrapers, the main rope 29 weight compensation rope 3. Tail code 4. There is a governor rope (not shown), etc., but in this specification, a case where the present invention is implemented on the tail cord 4 will be described.

Reference numeral 11 denotes a transverse signal wave transmitting device, which is provided near the oil side fulcrum of the tail cord. Although a detailed explanation of this structure will be omitted, a magnet applies a rolling pulse signal to the side surface of the tail cord, for example, three times in a row.

12 is a transverse signal wave receiving device, which is also provided near the fulcrum on the side of the tail cord. Although detailed explanation of the structure will be omitted, an acceleration pickup is used.

In general, the suspension struts of an elevator, including the tail cord, are not one but multiple, and when the horizontal sway of the struts becomes large enough, the struts collide with each other or with equipment in the tower, causing the above-mentioned problems. A transverse wave that is confused with a transverse signal wave may occur naturally.

For this purpose, as mentioned above, the rolling pulse signal is sent 3 times at equal intervals.
It is better to code the signal by giving it multiple times in succession so that it can be easily distinguished from noise signals.

In the above embodiments, a device for transmitting a transverse signal wave is provided near one end of the suspended strip, and a device for receiving the transverse signal wave of the suspended strip is provided on the same side as the transmitting device. However, in the case of a tail cord, a configuration in which the transmitting device is provided near the fulcrum on the side of the tail cord and the receiving device is provided near the fulcrum on the tower side is also a good practical configuration.

In the case of the main rope 21 and the weight compensation rope 3, the support point at one end of the suspension strip is a cage, while the other end is a rotating sheave.

Since it is difficult to provide a receiving device on the sheave side, a configuration in which the transmitting device and the receiving device are combined at the end of the sheave side as in the embodiment is practical.

Furthermore, in the above description of the embodiments, the case where the present invention is implemented to detect the entanglement of the tail cord has been taken up, but it is possible to implement the present invention to any of the main rope, weight compensating rope, etc.

The idea of the present invention is basically the same as that of an ultrasonic flaw detection tester, but whereas an ultrasonic flaw tester uses longitudinal waves that propagate in a solid, the present invention uses a linear wave. It is unique in that it uses transverse waves propagating in the longitudinal direction to detect entanglements in the striations.

Longitudinal waves also propagate inside the tensioned strips, but the extent to which the strips become entangled with equipment inside the tower does not have much of an effect on the propagation of longitudinal waves.

Furthermore, in the case of a tail cord that is supported at both ends and suspended loosely under its own weight in a U-shape, there is a problem because the propagation of longitudinal waves is hindered at the bottom of the U-shape's curve.

〔Effect of the invention〕

If the rails shake significantly due to an earthquake, typhoon, etc. and become entangled with equipment in the tower, the elevator can remain in operation by detecting that the rails are entangled before the elevator starts operating. Therefore, it is possible to completely prevent damage to the rails and equipment caused by driving with them entangled.

[Brief explanation of drawings]

The figure shows an embodiment of the present invention. 1... Basket, 2... Main rope, 3... Weight compensation rope, 4... Tail cord, 5... Hoist, 6...
- Warping wheel, 7... Counterweight, 8... Weight compensation rope pulley. 9... Part side fulcrum of the tail cord, 10... Tower side fulcrum of the tail cord, 11... Transverse wave signal wave transmitter, 12...
... Transverse signal wave receiving device, 13... Control device. Procedural amendment (method) % formula % Indication of the case Patent application No. 63-23361 Name of the invention Person who amends the device for detecting entanglement of suspension strata of an elevator Relationship with the case Applicant 1-6 Kanda Nishiki-cho, Chiyoda-ku, Tokyo AddressHitachi Elevator Service Co., Ltd.Representative: Futsuo Hirayo

Claims (1)

[Claims] (1) A device for transmitting a transverse signal wave to a suspended strip is installed near one end of the strip, and a device for receiving a transverse signal wave from the suspended strip is installed near the above-mentioned transmitting device or at the other end of the strip. The transmitter is installed near the end of the elevator to ensure that the emitted wave is received with a reasonable time delay from transmitting the shear wave signal wave to receiving the shear wave signal wave, corresponding to the suspension length of the strip that changes as the elevator car goes up and down. A device for detecting entanglement of suspension strips of an elevator, characterized in that a control device for determining the entanglement is provided.