JP2013124156A - Elevator system, elevator pulley groove diagnosis device, and elevator pulley groove diagnosis method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automatically detect a secular change of an elevator pulley groove, and to detect abrasion in the pulley groove.SOLUTION: An elevator system includes an elevator car vertically movable in a hoistway, a rope for supporting the elevator car, and a pulley which performs rotational motion in association with movement of the rope, and further includes an encoder for detecting the number of rotations of the pulley, a position detecting device for detecting the elevator car, and a pulley groove diagnostic device connected to the encoder and the position detecting device. The pulley groove diagnosis device calculates a distance from a point where the elevator car is detected by the position detecting device to a point where the elevator car reaches a predetermined position inside the shaft based on the number of rotations of pulley obtained from the encoder, and further diagnoses a degree of abrasion in the pulley groove from a difference between a distance calculation result in an initial state and a distance calculation result obtained when a predetermined time elapses.

Description

  The present invention relates to an elevator system, an elevator pulley groove diagnostic device, and an elevator pulley groove diagnostic method.

  The elevator car moves up and down by moving a rope that supports the car. When the rope moves, the pulley that supports the rope rotates. Therefore, the pulley groove that supports the rope changes with time (wears) every time the car moves.

  Therefore, it is necessary to measure the degree of secular change (wear) of the pulley groove during periodic inspection of the elevator (Patent Document 1).

JP 2010-132399 A

  However, since the rope is fitted in the pulley groove and the change of the groove is as small as several millimeters, manual measurement is difficult. In addition, since measurement is difficult, there is a risk of variations in the measured values. Furthermore, periodic manual inspection takes time, and the latest state cannot be known.

  An object of the present invention is to provide an elevator, an elevator pulley groove diagnostic device, and a pulley groove diagnostic method that can automatically diagnose an aging change of an elevator pulley groove.

  Another object of the present invention is to provide an elevator, an elevator pulley groove diagnostic device, and a pulley groove diagnostic method capable of more accurately measuring the secular change of an elevator pulley groove.

  Another object of the present invention is to provide an elevator, an elevator pulley groove diagnostic device, and a pulley groove diagnostic method capable of appropriately notifying the timing of replacement of an elevator pulley.

  An elevator system according to an embodiment of the present invention includes a car that can move up and down a hoistway, a rope that supports a car, a pulley that rotates as the rope moves, an encoder that detects the number of rotations of the pulley, and a car. And a pulley groove diagnosis device connected to the encoder and the position detection device. The pulley groove diagnosis device detects a predetermined car in the hoistway after the car is detected by the position detection device. The distance to reach the position is calculated based on the pulley rotation speed obtained from the encoder. From the difference between the distance calculation result in the initial state and the distance calculation result after a predetermined time has elapsed, the pulley groove Diagnose the degree of wear.

  In a preferred embodiment, when the difference between the distance calculation result in the initial state and the distance calculation result after a predetermined time has passed is greater than a predetermined threshold value, the pulley groove diagnostic device is the pulley replacement time. The determination result may be output by outputting the determination result.

FIG. 1 is a configuration diagram of an elevator pulley groove diagnostic system according to an embodiment of the present invention. FIG. 2 is a functional block diagram showing a functional configuration related to detection of the secular change of the pulley groove in the emergency stop control device 12. FIG. 3 is a flowchart showing a process for calculating the initial movement distance of the outer frame 1. FIG. 4 is a flowchart showing a process for detecting the secular change of the pulley groove.

  In the present embodiment, as described below, the secular change (wear) of the pulley groove is detected based on the amount of change from the beginning of the movement distance calculated from the number of rotations of the pulley. Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a configuration diagram of an elevator system including a pulley groove diagnostic device according to an embodiment of the present invention.

  The elevator system includes an outer frame 1 of the elevator. The outer frame 1 includes an upper car 2 and a lower car 3 inside. Each of the cars 2 and 3 includes two safety devices 4 in the upward direction. The elevator system includes a motor 5 that moves the outer frame 1 in the vertical direction and a motor control device 6 that controls the motor 5. The elevator system includes a counterweight 7 at a position facing the outer frame 1, and the outer frame 1 and the counterweight 7 are connected by a rope 8. The elevator system includes a pulley 9 that rotates according to vertical movement of the counterweight 7 (that is, movement of the rope 8). An encoder 10 is attached to the shaft of the pulley 9.

  In the vicinity of the upper end in the hoistway, an upper position detecting switch 11 for emergency stop is installed. The position detection switch 11 is turned on when the outer frame 1 of the elevator moves near the upper end. The elevator system includes an emergency stop control device 12 that can detect that the position detection switch 11 is turned on. The emergency stop control device 12 uses a pulse signal generated by the encoder 10 to calculate a moving distance from when the position detection switch 11 is turned on until the outer frame 1 stops at the uppermost floor (upper end). The moving speed of the outer frame 1 is calculated using the pulse signal generated by the encoder 10. And if it judges that the speed of the outer frame 1 with respect to the remaining distance to an upper end is abnormal, it has the function to operate the emergency stop apparatus 4 until the outer frame 1 reaches an upper end. Hereinafter, an outline of a mechanism for detecting the secular change of the pulley groove will be described.

  For example, the encoder 10 generates a large number of pulse signals each time the pulley 9 rotates once (or rotates at a predetermined angle). That is, the moving distance of the outer frame 1 can be calculated using the number of generated pulses. The moving distance from when the position detection switch 11 is turned on until the outer frame 1 reaches the upper end of the hoistway can be calculated using the pulse signal of the encoder 10. When the pulley groove is worn due to aging, the number of generated pulses is larger than when the pulley groove is not worn. This is because, when the pulley groove is worn, the diameter of the pulley 9 is shortened, so that the number of rotations of the pulley 9 required to move the outer frame 1 by the same distance is increased.

  On the other hand, the distance between the mounting position of the position detection switch 11 and the position where the outer frame 1 stops at the uppermost floor (upper end) hardly changes over time. Therefore, when the pulley groove has not changed over time, the moving distance between the mounting position of the position detection switch 11 and a predetermined stop position on the uppermost floor of the outer frame 1 (this is referred to as “initial moving distance”). Is calculated based on the pulse signal of the encoder 10 and held. The time when the pulley groove has not changed over time is, for example, immediately after the elevator is installed or immediately after the pulley is replaced. Thereafter, the moving distance between the position at which the position detection switch 11 is attached and the predetermined stop position on the uppermost floor is calculated based on the pulse signal of the encoder 10 in the same manner as described above. Then, the calculated movement distance is compared with the initial movement distance to calculate a difference. This difference is the degree of secular change (wear) of the pulley groove. Therefore, in this embodiment, the difference is compared with a predetermined threshold value, and if the difference is larger than the predetermined threshold value, it is determined that it is time to replace the pulley groove, and the pulley administrator is requested to replace the pulley. To encourage.

  FIG. 2 is a functional block diagram showing a functional configuration related to detection of the secular change of the pulley groove in the emergency stop control device 12. The emergency stop control device 12 includes, for example, an MPU (Micro Processing Unit) 14 and an I / O (Input / Output) buffer 13.

  The I / O buffer 13 receives the pulse signal generated by the encoder 10 and the detection signal generated by the position detection switch 11 and notifies the MPU 14 of the pulse signal.

  The MPU 14 implements various functions by executing computer programs (hereinafter referred to as “programs”). For example, the position detection unit 15, the distance calculation unit 16, and the change detection unit 17 described below are programs executed by the MPU 14. The functions 15, 16, and 17 can be provided as hardware circuits.

  The position detector 15 receives a position signal generated by the position detection switch 11 and detects whether or not the position detection switch 11 is turned on.

  The distance calculation unit 16 uses the pulse signal generated by the encoder 10 to calculate the movement distance when the outer frame 1 moves to a predetermined stop position after the position detection switch 11 is turned on.

  When the outer frame 1 of the elevator stops at a predetermined stop position, the change detection unit 17 stores the movement distance calculated by the distance calculation unit 16 as needed. The change detection unit 17 calculates an average value of several predetermined moving distances immediately after the elevator is installed, and holds this as an initial moving distance. After calculating the initial movement distance, the change detection unit 17 calculates a difference between the movement distance calculated by the distance calculation unit 16 at a certain time and the initial movement distance. And the change detection part 17 determines whether the difference is larger than a predetermined threshold value, and when the difference is larger than a predetermined threshold value, it determines that the pulley groove | channel changed over time. When the change detection unit 17 determines that the pulley groove is worn more than a predetermined amount, the change detection unit 17 notifies the motor control device 6 via the I / O buffer 13 and the control line 18.

  When the motor control device 6 receives a notification that the pulley groove has changed over time from the emergency stop control device 12, the motor control device 6 transmits an abnormality detection signal that prompts replacement of the pulley 9 to an elevator management device (not shown) or the like. At that time, for safety, the motor control device 6 may not operate the elevator until the pulley is replaced.

  FIG. 3 is a flowchart showing a process for calculating the initial movement distance of the outer frame 1. This process is executed immediately after the elevator is installed, that is, in a state where the pulley groove has not changed over time (wear).

  The emergency stop control device 12 repeats the following steps S12 to S14 a predetermined N (N is a positive integer) times (S11s).

  When the outer frame 1 travels upward and passes the position detection switch 11 near the upper end, the position detection switch 11 is turned on. The outer frame 1 stops at a predetermined position on the top floor (upper end). At this time, the position detection unit 15 detects that the position detection switch 11 is turned on (S12), and the position detection unit 15 detects that the outer frame 1 has stopped at a predetermined position on the top floor. (S13).

  The distance calculation unit 16 determines the movement distance from when the position detection unit 15 detects that the position detection switch 11 is turned on until the outer frame 1 is stopped at a predetermined position. Is calculated and stored (S14).

  When the emergency stop control device 12 completes the repetition of the processing from steps S12 to S14 (S11e), the emergency stop control device 12 performs the processing of the next step S15.

  The change detection unit 17 calculates the average value of the plurality of movement distances stored in step S14, stores this as the initial movement distance (S15), and ends the process.

  Thereby, the initial moving distance in a state where the pulley groove has not changed over time (wear) can be calculated.

  FIG. 4 is a flowchart showing a process for detecting the secular change of the pulley groove. This process is executed after the initial movement distance is calculated.

  When the outer frame 1 travels upward and passes through the position detection switch 11, the position detection switch 11 is turned on. Then, the outer frame 1 stops at a predetermined position on the top floor. At this time, the position detection unit 15 detects that the position detection switch 11 is turned on (S21), and the position detection unit 15 detects that the outer frame 1 has stopped at a predetermined position on the top floor. (S22).

  The distance calculation unit 16 determines the movement distance from when the position detection unit 15 detects that the position detection switch 11 is turned on until the outer frame 1 is stopped at a predetermined position. (S23).

  The change detection unit 17 calculates the difference between the initial movement distance and the movement distance measured this time, and determines whether this difference is larger than a predetermined threshold (S24).

  If this difference is not greater than the predetermined threshold (S24: NO), the change detection unit 17 determines that the secular change (wear) of the pulley groove is still at a satisfactory level, and the process returns to step S21.

  When this difference is larger than the predetermined threshold (S24: YES), the change detection unit 17 determines that it is time to replace the pulley 9, and indicates that the motor control device 6 has detected an abnormality in the pulley groove. A signal is transmitted (S25).

  When the motor control device 6 (the MPU) receives the abnormality detection signal from the emergency stop control device 12 (S26), the motor control device 6 outputs an abnormality detection signal for prompting the elevator management device or the like to replace the pulley groove (S27).

  Thereby, the manager of the elevator can easily know the appropriate timing for replacing the pulley 9.

  The above-described embodiments of the present invention are examples for explaining the present invention, and are not intended to limit the scope of the present invention only to those embodiments. Those skilled in the art can implement the present invention in various other modes without departing from the gist of the present invention.

  For example, the process for detecting the secular change may be processed by the MPU 20 included in the motor control device 6, or may be processed by a remote computer connected by a communication network.

  For example, a position detection switch 11 is provided in the vicinity of the lower end in the hoistway, and a pulse signal of the encoder 10 generated after the position detection switch 11 is turned on until the outer frame 1 reaches the lower end is detected. . Then, the secular change of the pulley groove may be detected based on the movement distance calculated using the detected pulse signal.

DESCRIPTION OF SYMBOLS 1 ... Outer frame, 4 ... Emergency stop device, 5 ... Motor, 6 ... Motor control device, 7 ... Counterweight, 8 ... Rope, 9 ... Pulley, 10 ... Encoder, 11 ... Position detection switch, 12 ... Emergency stop control device

Claims (7)

In an elevator system comprising a car that can move up and down the hoistway, a rope that supports the car, and a pulley that rotates as the rope moves,
An encoder for detecting the number of rotations of the pulley;
A position detection device for detecting the car;
A pulley groove diagnostic device connected to the encoder and the position detection device;
The pulley groove diagnostic device comprises:
A distance from when the car is detected by the position detection device to when the car reaches a predetermined position in the hoistway is calculated based on the number of rotations of the pulley obtained from the encoder,
From the difference between the distance calculation result in the initial state and the distance calculation result after a predetermined time has elapsed, the degree of wear of the pulley groove is diagnosed.
Elevator system.
The pulley groove diagnostic device comprises:
When the difference between the distance calculation result in the initial state and the distance calculation result after a predetermined time has passed is greater than a predetermined threshold, it is determined that it is the pulley replacement time, and the determination result is output. Item 2. The elevator system according to item 1.
The position detection device is installed on the upper end side of the hoistway,
The predetermined position is set as a stop position on the top floor of the car.
The elevator system according to claim 2.
The distance calculation result in the initial state is obtained as an average value of a plurality of distance calculation results obtained by moving the car up and down a plurality of times within a predetermined time after the pulley is attached.
The elevator system according to claim 3.
The elevator system according to claim 4, wherein the car is configured as a double deck type car that houses upper and lower cars in an outer frame.
A diagnostic device for diagnosing a pulley groove around which a rope for supporting a car moving up and down a hoistway is wound,
Connected to an encoder for detecting the rotation speed of the pulley and a position detecting device for detecting the car;
A distance from when the car is detected by the position detection device to when the car reaches a predetermined position in the hoistway is calculated based on the number of rotations of the pulley obtained from the encoder,
From the difference between the distance calculation result in the initial state and the distance calculation result after a predetermined time has elapsed, the degree of wear of the pulley groove is diagnosed.
Elevator pulley groove diagnostic device.
A diagnostic method for diagnosing a pulley groove around which a rope for supporting a car moving up and down a hoistway is wound,
Connected to an encoder for detecting the rotation speed of the pulley and a position detecting device for detecting the car;
A distance from when the car is detected by the position detection device to when the car reaches a predetermined position in the hoistway is calculated based on the number of rotations of the pulley obtained from the encoder,
From the difference between the distance calculation result in the initial state and the distance calculation result after a predetermined time has elapsed, the degree of wear of the pulley groove is diagnosed.
Elevator pulley groove diagnosis method.

Images