JP2014210656A - Elevator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an elevator capable of always monitoring a state of a main rope, and capable of immediately stopping the elevator when strand breakage occurs.SOLUTION: An elevating machine, for example, an elevator, includes: a plurality of tension adjustment devices having a cage 2, a balancing weight 3, a main rope 4 for lifting/lowering these cage 2 and the balancing weight 3, a wedge 5, a socket 6, a rod 7 and a connection pin 8 and the like, and adjusting the tension of the main rope 4; and an elevator control device 12 for performing operation control of the cage 2. The elevation machine also includes tension measuring devices 1A and 1B permanently installed and held at all the plurality of tension adjustment devices and measuring the tension of the main rope 4. The elevator control device 12 has a tension determination unit for determining whether or not tension 14 and 15 suddenly changed due to strand breakage, on the basis of the tension 14, 15 of the main rope 4 measured by the tension measuring devices 1A, 1B.

Description

  The present invention relates to an elevator such as an elevator provided with a tension adjusting device for a main rope that raises and lowers a car and a counterweight.

  In general, in an elevator, for example, an elevator, a steel wire rope is used as a main rope for raising and lowering a car and a balance weight. The wire rope is formed by twisting together a plurality of steel wires called strands. In this wire rope, the steel wire constituting the wire rope is broken little by little due to fatigue and wear. The number of steel wire breaks increases over time. Therefore, when the wire rope is regularly inspected and the number of breaks exceeds the reference value, it is determined that the wire rope, that is, the main rope has reached the end of its life, and is replaced.

  Here, in elevators, for example, three to ten main ropes are often used. When the tension of the main rope wound up by the main motor is unbalanced, there is a problem that the steel wire is rapidly worn and broken, leading to strand breakage. If the car runs in a state where the strand breaks, the broken strand may come into contact with the main motor or other elevator equipment, and the contacted equipment may be damaged. Conventionally, as a device for detecting breakage of a wire rope steel wire, Patent Literature 1 discloses a rope tester using a leakage magnetic flux flaw detection method.

Japanese Patent No. 4450594

  Patent Document 1 discloses a device for flaw detection of a plurality of main ropes using a leakage magnetic flux flaw detection method. In this conventional technique, a state in which a detector of a rope tester is in contact with a wire rope. Therefore, when it is applied to the wire rope that constitutes the main rope of an elevator such as an elevator, it is difficult to constantly monitor the state of the main rope. It was difficult to stop.

  The present invention has been made from the situation in the prior art described above. The purpose of the present invention is to provide an elevator that can constantly monitor the state of the main rope and can immediately stop the elevator when a strand break occurs. It is to provide.

  In order to achieve the above object, an elevator according to the present invention includes a car and a counterweight, a main rope that raises and lowers the car and the counterweight, a tension adjusting device that adjusts the tension of the main rope, An elevator including a control device that performs operation control, and a tension measuring device that is permanently held in all of the plurality of tension adjusting devices and that measures the tension of the main rope, and the control device is the tension measuring device. It is characterized by having a tension judgment section for judging whether or not the tension has suddenly changed due to strand breakage based on the measured tension of the main rope.

  The present invention can always monitor the state of the main rope by the tension measuring device that is permanently held in the tension adjusting device that adjusts the tension of the main rope and measures the tension of the main rope. When it is determined that the tension of the main rope has suddenly changed due to the strand breakage based on the tension of the main rope measured by the measuring device, the elevator can be stopped immediately. Thereby, this invention can suppress generation | occurrence | production of the contact to the main motor and other elevator apparatus of the broken strand. Therefore, the present invention can prevent damage to the main motor and other elevator equipment due to strand breaks, which has been a concern in the past.

It is a figure showing the important section composition of the elevator which constitutes one embodiment of the elevator of the present invention. It is a figure which shows the tension adjustment apparatus of the main rope with which the elevator which concerns on this embodiment is equipped, (a) A figure is a front view, (b) A figure is a side view. It is a figure explaining the tension judgment operation accompanying the slip of the main rope in the tension judgment part of the elevator control apparatus with which the elevator concerning this embodiment is equipped, (a) figure is a figure showing the output characteristic of the tension measuring device on the car side (B) is a figure which shows the output characteristic of the tension measuring device by the side of a balance weight. It is a figure explaining the tension judgment operation accompanying strand breakage in the tension judgment part of the elevator control device with which the elevator concerning this embodiment is equipped, (a) figure showing the output characteristic of the tension measuring device by the side of a car, b) The figure shows the output characteristics of the tension measuring device on the counterweight side.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of an elevator according to the present invention will be described with reference to the drawings.

  The elevator according to the present embodiment is composed of, for example, an elevator. As shown in FIG. 1, the elevator includes a car 2, a counterweight 3, a main rope 4 that raises and lowers the car 2 and the counterweight 3, and a main motor 13 that drives the main rope 4. Yes. Moreover, the elevator control apparatus 12 which performs operation control of the car 2 is provided.

  The elevator is connected to each end of the main rope 4 and includes a tension adjusting device that adjusts the tension of the main rope 4. For example, as shown in FIG. 2, the tension adjusting device includes a wedge 5 engaged with one end of the main rope 4, a socket 6 into which the wedge 5 is inserted, and a spring 6 connected to the socket 6. 10 includes a rod 7 to which 10 is engaged, and a connecting pin 8 that connects the socket 6 and the rod 7.

  The spring 10 is engaged with the rod 7 so that its lower end contacts a spring seat 11A disposed on a fixing member (not shown) and its upper end contacts another spring seat 11B disposed above the spring seat 11A. is there. The upward movement of the spring seat 11 </ b> B is restricted by the fixing nut 9. By adjusting the elastic force of the spring 10, the tension of the main rope 4 can be adjusted. The tension adjusting device connected to the other end of the main rope 4 has the same configuration as described above.

  This embodiment is a tension measuring device that is permanently installed in all of the plurality of tension adjusting devices and measures the tension of the main rope 4, that is, a tension measuring device that is permanently installed in the tension adjusting device on the car 2 side as shown in FIG. 1A and a tension measuring device 1B permanently installed in the tension adjusting device on the counterweight 3 side.

  For example, a tension measuring device 1A that is permanently installed in the tension adjusting device on the side of the car 2 is provided at a connecting pin 8 portion on a straight line connecting the rod 7, the wedge 5 and the connecting pin 8, as shown in FIG. For example, the tension measuring device 1 </ b> A on the car 2 side includes a pressure sensor that is disposed between the rod 7 and the connecting pin 8 and measures the pressure between the rod 7 and the connecting pin 8. The tension measuring device 1B that is permanently installed in the tension adjusting device on the counterweight 3 side is also arranged in the same manner as the tension measuring device 1A, and includes the same pressure sensor.

  In the present embodiment, the elevator control device 12 determines whether the tension has suddenly changed due to strand breakage based on the tension of the main rope 4 measured by each of the tension measuring devices 1A, 1B. Has a part. When it is determined by the tension determination unit that the tension has suddenly changed due to strand breakage, the elevator control device 12 immediately performs control to stop the raising and lowering of the car 2.

  In addition, the tension determination unit of the elevator control device 12 is configured to determine whether or not the tension of the main rope 4 has suddenly changed due to, for example, slipping of the main rope 4.

  Each of the tension measuring devices 1A and 1B is permanently held at all ends of the plurality of main ropes 4 so that the tensions of all the plurality of main ropes 4 can be constantly measured.

  When the tension of the main rope 4 changes due to the sliding of the main rope 4, the tension measured by the tension measuring device provided on either the car 2 side or the counterweight 3 side decreases, and the other side The tension measured by the tension measuring device provided in the is increased. For example, as shown in FIG. 3, when the tension 14 measured by the tension measuring device 1A on the car 2 side decreases, the tension 15 measured by the tension measuring device 1B on the counterweight 3 side increases. Therefore, when the output shown in FIG. 3 is obtained, it is determined in the tension determination unit of the elevator control device 12 that the main rope 4 has slipped. That is, the frictional force between the main rope 4 and the main motor 13 decreases, the main rope 4 slips with respect to the movement of the main motor 13, and the tension rapidly changes as the feed amount of the main rope 4 changes. It is judged.

  On the other hand, when the strand of the main rope 4 is broken, as shown in FIG. 4, the tension 14 measured by the tension measuring device 1A attached to the tension adjusting device on the car 2 side rapidly decreases, and the balance weight 3 The tension 15 measured by the tension measuring device 1B attached to the tension adjusting device on the side also rapidly decreases. Therefore, when the output shown in FIG. 4 is obtained, it is determined in the tension determination unit of the elevator control device 12 that a strand break has occurred. At this time, the elevator control device 12 performs control to immediately stop the raising / lowering of the car 2.

  As described above, in this embodiment, the state of the main rope 4 can be constantly monitored by the tension measuring devices 1A and 1B that are permanently held in the tension adjusting device that adjusts the tension of the main rope 4 and measures the tension of the main rope 4. When the tension determination unit of the elevator control device 12 determines that the tension of the main rope 4 has suddenly changed due to strand breakage based on the tension of the main rope 4 measured by the tension measuring devices 1A and 1B. The raising and lowering of the car 2 can be stopped immediately.

  Thereby, this embodiment can suppress generation | occurrence | production of the contact to the main motor 13 and other elevator apparatus of the broken strand. Therefore, this embodiment can prevent damage to the main motor 13 and other elevator equipment due to strand breakage.

  In the above-described embodiment, each of the tension measuring devices 1A and 1B is configured by a pressure sensor that is disposed between the rod 7 and the connecting pin 8 and measures the pressure between the rod 7 and the connecting pin 8. However, the present invention is not limited to configuring the tension measuring devices 1A and 1B by the pressure sensor in this way. For example, the tension measuring devices 1 </ b> A and 1 </ b> B may be configured by a strain sensor that measures the strain of the connecting pin 8 and outputs the measured value to the tension determination unit of the elevator control device 12.

  Further, the present invention can be applied to various roping elevators such as 1: 1 roping, 2: 1 roping, and 3: 1 roping.

1A Tension measuring device 1B Tension measuring device 2 Car 3 Balance weight 4 Main rope 5 Wedge 6 Socket 7 Rod 8 Connecting pin 9 Fixing nut 10 Spring 11A Spring seat 11B Spring seat 12 Elevator control device 13 Main motor 14 Tension 15 Tension

Claims (5)

In an elevator equipped with a car and a counterweight, a main rope for raising and lowering the car and the counterweight, a plurality of tension adjusting devices for adjusting the tension of the main rope, and a control device for controlling the operation of the car,
A tension measuring device that is permanently held in all of the plurality of tension adjusting devices and that measures the tension of the main rope,
The said control apparatus has a tension judgment part which judges whether the said tension changed rapidly by strand breakage based on the tension | tensile_strength of the said main rope measured with the said tension measuring device, The elevator characterized by the above-mentioned. The elevator according to claim 1,
The elevator according to claim 1, wherein the tension determination unit also determines whether or not the tension of the main rope has suddenly changed due to slippage of the main rope. The elevator according to claim 1 or 2,
The elevator consists of an elevator,
The tension adjusting device includes a wedge engaged with an end portion of the main rope, a socket into which the wedge is inserted, a rod connected to the socket and with a spring attached thereto, the socket and the rod. And a connecting pin for connecting
An elevator according to claim 1, wherein the tension measuring device is arranged on the connecting pin portion on a straight line connecting the rod, the wedge, and the connecting pin. The elevator according to claim 3,
The tension measuring device is disposed between the rod and the connecting pin, and includes a pressure sensor that measures a pressure between the rod and the connecting pin. The elevator according to claim 3,
The tension measuring device comprises a strain sensor that measures strain of the connecting pin.

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