JP2018140868A - Elevator rope swing detection system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an elevator rope swing detection system that exactly detects a state in which a rope is actually swung and appropriately addresses the situation.SOLUTION: An elevator rope swing detection system according to one embodiment comprises a main rope 15 that moves in accordance with an elevating operation of a car 16 via sheaves 13, 14, a plurality of acceleration sensors 22a, 22b, 22c... embedded for each predetermined interval along the horizontal direction of the main rope 15, and a rope swing detection device 21 that detects a swing amount of the main rope 15 based on an acceleration signal in the longitudinal direction output from these acceleration sensors 22a, 22b, 22c....SELECTED DRAWING: Figure 1

Description

  Embodiments described herein relate generally to an elevator rope runout detection system.

  When a building is made taller, the natural frequency of the building decreases, so that resonance phenomenon is likely to occur during an earthquake or a strong wind. Here, if the natural frequency of the building matches the natural frequency of the elevator rope (main rope, compen- sion rope, etc.) installed in the hoistway, the rope will shake greatly due to resonance, and the equipment in the hoistway There is a risk that a so-called “confinement accident” may occur.

  In order to prevent such an accident, when a building shakes, the amount of rope swing is predicted from the relationship between the amount of shaking of the building and the position of the car using a predetermined formula, and the resulting rope There is a method of switching to the control operation when the amount of vibration exceeds the threshold value. There is also a method for detecting the amount of rope shake using a photoelectric sensor or a camera.

JP 2011-51739 A Japanese Patent No. 5595582 Japanese Unexamined Patent Publication No. 2015-42583

  However, the method described above does not directly detect rope runout. For this reason, the state where the rope is actually swaying cannot be grasped, and there is a possibility that a delay may occur when the rope comes into contact with the equipment in the hoistway.

  The problem to be solved by the present invention is to provide a rope runout detection system for an elevator that can accurately detect a state in which the rope is actually swinging and can appropriately cope with it.

  An elevator rope run-out detection system according to an embodiment includes a rope that moves through a sheave along with a lifting operation of a car, a plurality of acceleration sensors embedded at regular intervals along the longitudinal direction of the rope, and these Detecting means for detecting a swing amount of the rope based on a horizontal acceleration signal output from the acceleration sensor.

FIG. 1 is a diagram illustrating an overall configuration of an elevator according to an embodiment. FIG. 2 is a cross-sectional view of a main rope used for the elevator in the embodiment. FIG. 3 is a view for explaining the relationship between the horizontal movement of the main rope and the acceleration sensor in the embodiment. FIG. 4 is a view for explaining the relationship between the horizontal movement of the main rope and the acceleration sensor in the embodiment. FIG. 5 is a diagram for explaining the relationship between the vertical movement of the main rope and the acceleration sensor in the embodiment. FIG. 6 is a flowchart showing the operation of the rope runout detection system in the same embodiment. FIG. 7 is a view for explaining the relationship between the swing amount of each part of the main rope and the car position in the embodiment. FIG. 8 is a diagram for explaining setting of a threshold value for determining contact of the main rope in the embodiment.

  Hereinafter, embodiments will be described with reference to the drawings.

  FIG. 1 is a diagram illustrating an overall configuration of an elevator according to an embodiment. Assume that one elevator 11 is installed in a building 10.

  A hoisting machine 12 that is a drive source of the elevator 11 is installed in a machine room 10 a at the top of the building 10. In the machine roomless type elevator, the hoisting machine 12 is installed in the upper part of the hoistway 10b. A main rope 15 is installed on a main sheave 13 and a deflecting sheave 14 attached to the rotating shaft of the hoisting machine 12. Although there are actually a plurality of main ropes 15, only one is shown here for convenience. The main rope 15 is attached to one end of the car 16 and the other end is attached to a counterweight 17.

  In addition, a compensatory 18 is installed at the lowermost part of the hoistway 10 b, and the end of the compensatory rope 19 is attached to the bottom of the car 16 and the counterweight 17 via the compensatory 18. This compen- sion rope 19 is for stabilizing the movement of the car 16 and the counterweight 17.

  The main sheave 13 is rotated by driving the hoisting machine 12, and the main rope 15 is moved along with the main sheave 13 through the sheave 14. As a result, the car 16 and the counterweight 17 move up and down in a sliding manner. At this time, the compen- sion rope 19 attached to the bottoms of the car 16 and the counterweight 17 moves through the compensatory 18.

  In the example of FIG. 1, the configuration in which the car 16 and the counterweight 17 are moved up and down in the 1: 1 roping format is shown. However, the present invention is not particularly limited to the 1: 1 roping format. : 1 roping format or the like.

  On the other hand, in the machine room 10a or the machine roomless type of the building 10, an elevator control device 20 and a rope runout detection device 21 are installed in the hoistway 10b.

  The elevator control device 20 is also referred to as a “control panel” and includes a computer equipped with a CPU, ROM, RAM, and the like, and controls the entire elevator including drive control of the hoisting machine 12 and the like. In the present embodiment, the elevator control device 20 has a function of controlling the operation of the car 16 based on the amount of rope shake detected by the rope shake detection device 21. The rope runout detection device 21 is connected to the elevator control device 20, and receives a signal of each of acceleration sensors 22a, 22b, 22c..., 23a, 23b, 23c. And a function of detecting the amount of rope runout.

  “Rope runout” is the horizontal runout of the rope. Further, the “rope” referred to here is a rope related to the raising / lowering operation of the car 16, and includes a compen- sion rope 19 in addition to the main rope 15 in the example of FIG. 1.

  Here, a plurality of acceleration sensors 22a, 22b, 22c... Are embedded in the main rope 15 at regular intervals along the longitudinal direction. Similarly, a plurality of acceleration sensors 23a, 23b, 23c,... Are embedded in the compensation rope 19 at regular intervals along the longitudinal direction. These consist of a triaxial acceleration sensor capable of measuring acceleration in three directions of the x, y and z axes. When the car door 16 of the car 16 is viewed from the front, the left-right direction of the car door 16a is the x-axis, the front-rear direction is the y-axis, and the up-down direction is the z-axis.

  These acceleration sensors 22a, 22b, 22c..., 23a, 23b, 23c... Have a wireless communication function and a battery. The wireless communication function performs wireless communication with the rope shake detection device 21 within a predetermined communication range. The battery has a capacity capable of supplying electric power necessary for sensor operation at least until the rope is replaced. These acceleration sensors 22a, 22b, 22c,..., 23a, 23b, 23c,.

  Next, the relationship between the rope and the acceleration sensor will be described. In the following, the main rope 15 will be described as an example, but the same applies to the compensation rope 19. In addition, an arbitrary one of the plurality of acceleration sensors 22a, 22b, 22c... Used for the main rope 15 will be described as the acceleration sensor 22.

  FIG. 2 is a cross-sectional view of a main rope 15 used in the elevator 11, and an example of an 8-strand rope is shown here.

  The outer periphery of the main rope 15 is surrounded by the strand 31, and the shaft core 33 is interposed through the resin 32 therein. The strand 31 is formed by twisting a plurality of strands into a single layer or multiple layers. A plurality of strands 31 (eight in this example) are used and twisted around the shaft core 33 at a predetermined pitch. The shaft core 33 is made of resin solid, and a three-axis acceleration sensor 22 is embedded in the horizontal axis as an x-axis, a y-axis, and a vertical direction as a z-axis.

  The acceleration sensor 22 is covered with a resin 32 in the rope so that the main rope 15 does not deviate even when passing through the main sheave 13 and the deflecting sheave 14. The resin 32 is made of a material that does not affect the wireless communication of the acceleration sensor 22. A material that does not affect the wireless communication of the acceleration sensor 22 is also used for the strand 31 that surrounds the outer periphery of the rope.

  As shown in FIGS. 3 and 4, the initial position of the acceleration sensor 22 (x-axis, y-axis, and z-axis signal values) is set, and the main amount is determined from the displacement amount in the x-axis direction and the displacement amount in the y-axis direction. The horizontal deflection amount of the rope 15 is obtained. Further, as shown in FIG. 5, the horizontal shake amount is obtained from the displacement amount of the acceleration sensor 22 in the z-axis direction in association with the position of the car 16 (the vertical movement of the main rope 15).

  Next, the operation of the rope runout detection system in the embodiment will be described.

FIG. 6 is a flowchart showing the operation of this system.
First, before starting the operation of the car 16, the initial positions (signal values of the x-axis, y-axis, and z-axis) of the acceleration sensors 22a, 22b, 22c... Embedded in the main rope 15 are set. In addition, it is stored in the rope shake detection device 21 (step S11). When the operation of the car 16 is started (step S12), the acceleration signals in the triaxial directions detected by the acceleration sensors 22a, 22b, 22c... During the operation are sequentially transmitted to the rope shake detection device 21 by wireless communication. (Step S13). The rope runout detection device 21 detects the runout amount of each part of the main rope 15 in association with the position of the car 16 based on these acceleration signals (step S14).

  Specifically, as shown in FIG. 7, identification numbers D1, D2, D3... Are attached to the acceleration sensors 22a, 22b, 22c. And these identification numbers D1, D2, D3... And the displacement amounts of the acceleration sensors 22a, 22b, 22c. It is determined how much of the main rope 15 is swung according to the position.

  Here, the elevator control device 20 determines the horizontal distance until the main rope 15 comes into contact with the contact object in the hoistway 10b as a threshold value, and the elevator control device 20 detects the main rope 15 detected by the rope shake detection device 21. It is determined whether or not the shake amount at each location is within the threshold value (step S15).

  The contact object in the hoistway 10b is, for example, guide rails 24a and 24b as shown in FIG. The guide rails 24 a and 24 b are erected in the hoistway 10 b and support both sides of the car 16. Actually, the main rope 15 is composed of a plurality of ropes, and among these ropes, the rope that is most likely to come into contact with the contact target in the hoistway 10b is set as the target rope for shake detection. A threshold for the shake amount is determined. In the example of FIG. 8, the leftmost rope 15a in the figure is the target rope for shake detection, and the distance La until any point in the longitudinal direction of the rope 15a contacts the guide rail 24a is defined as a threshold value. .

  The acceleration sensors 22a, 22b, 22c,... May be embedded in both the left end rope 15a and the right end rope 15b, or the acceleration sensors 22a, 22b, 22c,. It is good also as a structure which embeds and calculates | requires the deflection amount of each rope separately.

  In addition to the guide rails 24a and 24b, the contact object in the hoistway 10b includes, for example, the counterweight 17 and a hall shell on each floor (not shown). Therefore, considering that the rope is in contact with any of these contact objects, the distance to the closest contact object is preferably set as the threshold value.

  Here, when the deflection amount of each part of the main rope 15 is within the above threshold (Yes in Step S15), the elevator control device 20 determines that it is in a normal state and continues normal operation as it is (Step S15). S16). The normal operation is an operation in which the car 16 is moved in response to a call (a hall call / car call) at a steady speed.

  On the other hand, when the shake amount of any part of the main rope 15 exceeds the threshold value (No in step S15), the elevator control device 20 causes the main rope 15 to contact the contact object in the hoistway 10b. Whether or not (step S17).

  In this case, as in the example of FIG. 8, if the distance La until the rope 15a contacts the guide rail 24a is determined as a threshold, if any of the portions of the rope 15a swings exceeding La, It can be determined that it is in contact with the guide rail 24a. That is, since the relative position of the rope 15a and the guide rail 24a is the same at any location, it can be determined that the rope 15a is in contact with the guide rail 24a if a part of the rope 15a is swung beyond La. That is, when determining whether or not the rope 15a is in contact with the guide rail 24a, the above steps S15 and S17 may be performed at the same time. If a part of the rope 15a is swung beyond La, the guide rail 24a is contacted. It is also possible to proceed to the control operation which will be described later.

  For example, when the distance (referred to as Lc) between the rope 15a and the counterweight 17 is set as a threshold value, the position in the Z-axis direction between the portion of the rope 15a that swings beyond Lc and the counterweight 17 It is necessary to confirm. That is, it can be determined that the counter weight 17 is in contact if the portion of the rope 15a that has swung beyond Lc matches the position of the counter weight 17 in the Z-axis direction.

  When the rope 15a comes into contact with any contact object, a sudden change appears in the signals of the acceleration sensors 22a, 22b, 22c... By the impact at that time. .

  Returning to the flowchart of FIG. 6, when the elevator control device 20 determines that the main rope 15 is not in contact with the contact object in the hoistway 10b (No in step S17), the elevator control device 20 switches to the control operation and gets on. The car 16 is stopped at the nearest floor (step S18). Depending on the position of the car 16, the swing of the main rope 15 may be increased by the resonance action. Therefore, the car 16 is stopped at the nearest floor until the swing of the main rope 15 is settled. The passenger may be lowered at the nearest floor, or the passenger may be waited in the car, and the operation may be resumed as soon as the main rope 15 swings.

  When the elevator control device 20 determines that the main rope 15 has contacted the contact object in the hoistway 10b (Yes in step S17), the elevator control device 20 immediately stops the operation of the car 16 (step S19). This is because the main rope 15 may be tangled with the contact object, and it is dangerous to continue driving. When the operation of the car 16 is stopped, the fact is notified to an elevator monitoring center (not shown) or a monitoring room (not shown) in the building, and the maintenance staff or the like goes to rescue.

  In this way, by embedding the acceleration sensors 22a, 22b, 22c,... In the main rope 15 at a constant interval, the main changes can be made from the signal changes of the acceleration sensors 22a, 22b, 22c,. The state where the rope 15 is swinging can be accurately detected.

  Further, when the main rope 15 comes into contact with the contact object in the hoistway 10b, it can be determined from the installation position of the acceleration sensors 22a, 22b, 22c. The maintenance staff can save the trouble of checking the entire rope when checking the contact point.

  Further, when the car 16 is stopped at the nearest floor by the control operation, it is automatically confirmed from the signals of the acceleration sensors 22a, 22b, 22c,. The operation of 16 can be resumed promptly.

  In the above-described embodiment, the main rope 15 has been described as an example. However, the same applies to the compen- sion rope 19 that moves through the compensatory 18 during the operation of the car 16. That is, the shake amount of the compensation rope 19 can be detected in real time from changes in the acceleration sensors 23a, 23b, 23c... Signals embedded in the compensation rope 19 at regular intervals, and the shake amount at that time and the contact in the hoistway 10b. The operation of the car 16 can be controlled from the relationship with the object.

  In the example of FIG. 1, the elevator control device 20 and the rope shake detection device 21 are provided independently. However, the elevator control device 20 may be integrated with the function of the rope shake detection device 21.

  According to at least one embodiment described above, it is possible to provide an elevator rope runout detection system that can accurately detect the state in which the rope is actually swinging and can appropriately cope with it.

  In addition, although some embodiment of this invention was described, these embodiment is shown as an example and is not intending limiting the range of invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 10 ... Building, 10a ... Machine room, 10b ... Hoistway, 11 ... Elevator, 12 ... Hoisting machine, 13 ... Main sheave, 14 ... Deflection sheave, 15 ... Main rope, 16 ... Ride car, 16a ... Car door, 17 ... Counterweight, 18 ... Compensation, 19 ... Compen rope, 20 ... Elevator control device, 21 ... Rope shake detection device, 22, 22a, 22b, 22c ... Acceleration sensor, 23, 23a, 23b, 23c ... Acceleration sensor, 31 ... strand, 32 ... resin, 33 ... shaft core.

An elevator rope run-out detection system according to an embodiment includes a rope that moves through a sheave along with a lifting operation of a car, a plurality of acceleration sensors embedded at regular intervals along the longitudinal direction of the rope, and these Detecting means for detecting a swing amount of the rope based on a horizontal acceleration signal output from the acceleration sensor.
The detecting means detects a swing amount of each part of the rope in association with a position of the car based on horizontal and vertical acceleration signals output from the acceleration sensors during operation of the car. It is characterized by that.

Claims (7)

A rope that moves through the sheave as the elevator moves up and down,
A plurality of acceleration sensors embedded at regular intervals along the length of the rope;
An elevator rope runout detection system comprising: detecting means for detecting the amount of rope runout based on a horizontal acceleration signal output from these acceleration sensors. The detecting means is
The swing amount of each part of the rope is detected in association with the position of the car based on horizontal and vertical acceleration signals output from the respective acceleration sensors during operation of the car. The elevator rope runout detection system according to Item 1.   The elevator rope runout detection system according to claim 1, further comprising operation control means for controlling the operation of the car based on the runout amount of the rope detected by the detection means. The operation control means includes
If the rope runout is within a preset threshold, continue normal operation, and if the rope runout exceeds the threshold, switch to controlled operation and stop the car at the nearest floor. The elevator rope runout detection system according to claim 3. The operation control means includes
When the swing amount of the rope exceeds the threshold value, it is determined whether the rope has contacted the contact object in the hoistway, and when it is determined that the rope has contacted the contact object in the hoistway, 5. The elevator rope runout detection system according to claim 4, wherein the operation of the car is stopped. The operation control means includes
The elevator rope runout detection system according to claim 4, wherein a distance in a horizontal direction until the rope comes into contact with a contact object in the hoistway is determined as a threshold value.   The elevator run-out detection system according to claim 6, wherein the contact object in the hoistway includes a guide rail for supporting the car.

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