JPH09156854A - Rope slip judging device for elevator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply judge a rope slip only by one speed detecting means. SOLUTION: This rope slip judging device for elevator is provided with a speed detecting means 11 detecting the speed of a car, a memory means 15 storing the detected data of the detecting means 11, and a computing means 17 computing the deceleration of the car, emergency stop of an elevator is carried out during ascending, deceleration of the car is computed by the computing means 17 from the speed data detected by the speed detecting mean 11, and by comparing it with deceleration of the elevator at ordinary traveling, friction force between a main rope 7 and a sheave 8 is judged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevator rope slippage judging device for judging whether a sufficient frictional force is applied between the main rope of an elevator and a sheave to drive the elevator.

[0002]

2. Description of the Related Art Generally, when an elevator runs normally, slippage does not occur between the main rope and the sheave if the frictional force between the main rope and the sheave is sufficient, but the main rope is worn and the sheave surface is damaged. If the frictional force decreases due to such factors as the car's acceleration or deceleration, slippage will occur, causing an error in the position at which the car will stop, or the floor position of the car when the car has many passengers. There is a risk of failure such as change.

In a conventional elevator rope slippage judging device, as described in Japanese Patent Laid-Open No. 3-8681, a position switch for detecting passage of a car detects a moving distance of the car and the number of revolutions of an elevator motor. The driving distance of the car is calculated from the above, the moving distance of the car is compared with the driving distance of the car, the slip between the main rope and the sheave is detected, and the frictional force is determined. As described in JP-A-191270, by comparing the output corresponding to the traveling distance of the car with the output corresponding to the driving distance of the elevator hoist, slip between the main rope and the sheave is detected and The slip between sheaves was detected and the frictional force was determined.

[0004]

However, the conventional elevator rope slippage determination device detects the actual movement of the car suspended on the main rope in order to detect the slippage between the main rope and the sheave. Means and a means for detecting the drive distance by the electric motor or hoist of the elevator directly connected to the sheave are required, and the two detecting means complicate the structure of the apparatus. Also,
Since the two data obtained from the two detection means are compared and determined, the processing of the data is complicated.

It is an object of the present invention to provide an elevator rope slippage judging device which can make a judgment easily with only one detecting means.

[0006]

In order to achieve the above object, the present invention detects slippage between a main rope for suspending a car and a counterweight of an elevator and a sheave around which the main rope is wound by a speed detecting means. In an elevator rope slip determination device that determines the frictional force by
Computation means for comparing the car deceleration calculated based on the output of the speed detecting means when the car is in an emergency stop during ascending operation with the car deceleration during normal elevator driving, and its comparison An output means for outputting the result is provided.

As described above, the elevator rope slippage judging device of the present invention calculates the car deceleration on the basis of the data obtained by the speed detecting means and compares it with the car deceleration of the normal operation. Therefore, the frictional force acting between the main rope and the sheave makes it possible to make a judgment in a state where the rope slip of the elevator is likely to occur, and moreover, it is possible to make a judgment by only one detecting means, and it is possible to make a judgment as in the conventional case. It becomes possible to easily process the data without the need to match the data obtained from the detecting means.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an overall configuration diagram of an elevator rope slippage judging device according to an embodiment of the present invention. An electric machine 2 and a brake 3 are provided in an upper machine room 1, and electric power is supplied from a main power supply. As a result, the brake 3 is opened, the electric motor 2 is activated, and the car 5 and the counterweight 6 are moved up and down within the hoistway 4 formed below the machine room 1. The main rope 7 wound around the sheave 8 that rotates integrally with the rotating shaft of the electric motor 2,
Both ends are connected to the car 5 and the counterweight 6 via the beam pulley 9, and the lower parts of the car 5 and the counterweight 6 are connected by a compensating rope 10. The beam pulley 9 is provided with speed detecting means 11 for outputting speed data of the elevator,
The speed detecting means 11 is connected to the calculating means 13 such as a personal computer for processing the speed data of the elevator via the control section 12. The control unit 12 has a microcomputer 14, and this microcomputer 14 controls the timing of transmitting the speed data of the car 5 output from the speed detecting means 11 to the calculating means 13 and switching control of transmission / reception. ing. On the other hand, the calculating means 13 stores the speed data of the elevator, the storage unit 15, the deceleration detection unit 16 that detects the deceleration start point where the elevator starts deceleration in response to the emergency stop command, and the speed stored in the storage unit 15. The calculation unit 17 calculates a deceleration from the data, and the output unit 18 outputs the calculation result of the calculation unit 17 on a display or the like.

2 and 3 are flow charts for explaining the process of determining the frictional force between the main rope 7 and the sheave 8.
If the frictional force between the main rope 7 and the sheave 8 is to be determined, the elevator is first stopped at the lowest floor in step S1. This is to make an emergency stop of the elevator in order to determine the frictional force between the rope 7 and the sheave 8, but to ensure a sufficient distance for stopping even if rope slip occurs at that time. Next, in step S2, the elevator is operated to rise, and the car speed at this time is raised to the rated speed on the assumption that an emergency stop is actually performed. Normally, in the elevator, the suspending weight 6 is set to be heavier than the car 5 in consideration of the driving efficiency, and the car 5 is in a state of being pulled by the counterweight 6, so that the passengers get in the car 5. If the ascending operation is carried out and stopped in a state where it is not in the state of slipping, there is a high possibility that slippage will occur between the main rope 7 and the sheave 8. Therefore, an emergency stop is performed during the elevator ascending operation in which it is considered that slippage is most likely to occur between the main rope 7 and the sheave 8. That is, in step S3, detection of the car speed is started by the speed detecting means 11 attached to the beam pulley 9, and in step S4, an emergency stop is performed when the car 5 reaches the middle floor. During this time, the detected speed data is communicated by the microcomputer 14 of the control unit 12 to the calculation unit 13 and stored in the storage unit 15 in the calculation unit 13. When an emergency stop is performed in step S4, the sheave 8 shown in FIG. 1 is braked by the brake 3 and the rotation is immediately stopped, but the car 5 is pulled by the counterweight 6 for the no-load rising operation, It cannot be stopped immediately and slips between the main rope 7 and the sheave 8 to rise. In step S5 thereafter, it is determined whether or not the car 5 is stopped, and after the car is confirmed to be stopped by the frictional force between the main rope 7 and the sheave 8, the detection of the car speed is ended in step S6.

From step S7, the processing is performed in the calculation means 13. First, in step S7, the deceleration point detection part 16 of the calculation means 13 sequentially reads the car speeds stored in the storage part 15, and in step S8, it continues. The reduced deceleration data, that is, the portion where the emergency stop is performed is detected, and the portion where the emergency stop is performed is stored as the deceleration point in step S9. Next, in step S10 shown in FIG.
From the deceleration point at which the elevator starts decelerating, the computing unit 17 sequentially reads the speed data and divides the difference from the previous speed data by the data communication processing time to calculate the car deceleration. After that, in step S11, it is confirmed whether there is car speed data, and as long as there is speed data, the process of step S10 is repeated until the speed data is exhausted. Then, in step S12, the car deceleration calculation ends. Next, in step S13, the average value of the car deceleration is calculated, and in step S14, step S1
The average value of the car deceleration calculated in 3 is compared with the car deceleration of normal operation.

A comparison between the calculated average value of the car deceleration of the car and the car deceleration of the normal operation will be described with reference to FIGS. 4 to 6. FIG. 4 is a characteristic diagram showing the speed and acceleration of the car during normal traveling. The car speed (a)
The car acceleration (b) indicates that a deceleration command is issued at time T1 and the vehicle is stopped at time T2 during steady traveling at the car speed V. In this case, the car deceleration during deceleration is A
It is represented by the part 1. FIG. 5 is a characteristic diagram showing the speed and acceleration of the car at the time of emergency stop of the elevator. The car speed (a) and car acceleration (b) are the time when the emergency stop command is issued at time T3. It shows that it stopped at T4, and the car deceleration of the deceleration in this case is A
It is represented by part 2. FIG. 6 is a characteristic diagram showing the speed and acceleration of the car during emergency operation of the elevator. The car speed (a) and car acceleration (b) are shown at time T5.
An emergency stop command was issued at and the car stopped at time T6. In this case, the car deceleration during deceleration is A3.
It is represented by the part.

Comparing FIGS. 4 and 5, the car deceleration A2 at the time of emergency stop is larger than the car deceleration A1 in normal operation, and the car has a main rope 7 and a sheave. The one braked by the frictional force between 8
If the frictional force acting between the main rope 7 and the sheave 8 is stronger than the force acting on the deceleration in the normal operation, the deceleration in the normal operation does not slip and is safe. Therefore, in the case of the same state, it is determined as a pass in step S15 shown in FIG. Also, comparing FIG. 4 and FIG. 6,
The car deceleration A3 during an emergency stop is smaller than the car deceleration A1 during normal operation, and it is better for the car to be braked by the frictional force between the main rope 7 and the sheave 8 during deceleration during normal operation. The frictional force, which is weaker than the acting force and acts between the main rope 7 and the sheave 8, may cause slippage during deceleration in normal operation. Therefore, when such a state is observed, it is determined as a failure in step S16 shown in FIG.

Thereafter, in step S17 shown in FIG. 3, as shown in the display examples of the rope slipping judgment results of FIGS. 7 and 8, the pass / fail judgment, the car speed, and the car deceleration are output by the output means of the calculating means 13. Output to 18. In the display example of the rope slip determination result of FIG. 7, the car deceleration 20 is calculated from the change of the car speed 19, and the car acceleration 20 is larger than the car deceleration 22 during normal traveling. As the determination 23, the display of acceptance is output on the screen. The fact that the car acceleration 20 in this case is higher than the car deceleration 22 during normal traveling means that sufficient safety is exerted between the rope and the sheave, and the car is safe. In addition, the display example of the rope slipping determination result in FIG. 8 is based on the change in the car speed 24 and the car deceleration 25.
Is calculated and the car acceleration 25 is smaller than the car deceleration 27 during normal traveling.
Is displayed on the screen. In this case, the car acceleration 25 is the car deceleration 27 during normal driving.
A smaller value means that the frictional force between the rope and the sheave is small, which may cause rope slippage during deceleration.

In this way, the elevator is operated to rise and the emergency stop is performed, and the rope slip of the elevator can be determined only by the speed detecting means 11 installed on the beam pulley 9. Therefore, a plurality of detections as in the conventional case can be made. Since the data obtained from the means is not compared and determined, the data processing can be easily performed.

In the above-described embodiment, the current state of the frictional force between the rope and the sheave is determined, but the flowchart of the friction sign diagnosis between the sheave and the rope of the elevator for predicting the situation in the near future is illustrated. 9 shows. First, in step S18, for example, a specific day of each month is set and the above-described rope slippage determination is periodically performed. Next, in step S19, the traveling time of the elevator at this time and the car acceleration calculated in this process are stored in the storage unit 15 of the calculating means 13, and the past three times stored in the storage unit 15 in step S20. By reading the above data, from the rate of change in the acceleration of the car three or more times in the past,
Predict the value of the car acceleration that will be obtained in the next determination process. If this value is smaller than the car acceleration during normal traveling, it is diagnosed that there is a possibility that it will be determined to be unacceptable in the next determination process.

FIG. 10 shows an example of a display screen of the car acceleration predicted in step S20. The value of the car acceleration in the elevator traveling time, which is the next judgment, is predicted from the rate of change of the past car accelerations 29a, 29b, 29c, and the predicted value is the judgment line 2
If it is smaller than 8, it is determined to be defective. In this way, by performing the friction sign diagnosis, if there is a possibility that it will be judged as a failure in the next judgment processing, it is possible to prepare for repair work in advance, so maintenance work can be executed very well. It is possible to prevent the accident due to the rope slippage by predicting the frictional force between the main rope and the sheave.

In the present embodiment, the car deceleration during normal operation is assumed to be already known, and this is compared with the car deceleration during emergency stop.
Even when the car deceleration during normal operation is unknown, the car deceleration during normal operation can be calculated by the same method as in the present embodiment. Further, in the present embodiment, the speed detection means 11 is newly installed to determine the rope slip. However, when the speed detection means for detecting the car speed in the elevator is already attached, its output signal Can also be used to calculate the car deceleration and to determine rope slip.

[0018]

As described above, the elevator rope slippage judging apparatus of the present invention performs an emergency stop by raising the elevator, and at this time, the car deceleration is performed based on the data obtained by the speed detecting means. By calculating the average value of the car deceleration and comparing the average value of the car deceleration and the average value of the car deceleration during normal operation, the frictional force acting between the main rope and the sheave causes the rope slip of the elevator. Since only one speed detecting means can be used for the judgment, it is not necessary to match the data obtained from a plurality of speed detecting means as in the conventional case, and the data can be easily processed. You can

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of an elevator rope slippage determination device according to an embodiment of the present invention.

FIG. 2 is a flowchart showing a first half of a frictional force determination process between a main rope and a sheave of the elevator rope slippage determination device shown in FIG.

FIG. 3 is a flowchart showing the latter half of the determination process for the frictional force between the main rope and sheave shown in FIG.

FIG. 4 is a characteristic diagram showing the car speed and acceleration of the elevator during normal traveling.

FIG. 5 is a characteristic diagram showing a car speed and an acceleration of the elevator during an emergency stop of the elevator.

FIG. 6 is a characteristic diagram showing the car speed and acceleration during another emergency operation of the elevator.

7 is a waveform diagram showing a display example of rope slip determination results of the elevator rope slip determination device shown in FIG.

8 is a waveform diagram showing a display example of rope slip determination results of the elevator rope slip determination device shown in FIG.

9 is a flowchart of a sign of friction diagnosis between the sheave and the rope of the elevator rope slippage determination apparatus shown in FIG.

10 is a waveform diagram showing a display example of the friction sign diagnosis shown in FIG.

[Explanation of symbols]

 5 Car basket 6 Balance weight 7 Main rope 8 Sheave 9 Beam pulley 11 Speed detection means 13 Calculation means 14 Microcomputer 15 Memory section 16 Deceleration detection section 17 Calculation section 18 Output means 19 Car speed 20, 22 Car deceleration

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ichiro Kawakami 1-6 Kandanishikicho, Chiyoda-ku, Tokyo Inside Hitachi Building System Service Co., Ltd.

Claims (4)

[Claims] 1. An elevator rope slip determination device for determining frictional force by detecting a slip between a main rope for suspending a car and a counterweight of an elevator and a sheave around which the main rope is wound to determine a frictional force. , A calculating means for comparing the car deceleration calculated based on the output of the speed detecting means when the car is in an emergency stop during an ascending operation, and a car deceleration during normal elevator traveling, and a comparison thereof. An elevator rope slippage judging device comprising: output means for outputting a result. 2. The device according to claim 1, further comprising storage means for storing data detected by the speed detecting means,
In order to detect the car deceleration, the arithmetic means sequentially compares the magnitudes of the speed data stored in the storage means to calculate a deceleration start point at which the car speed is continuously decelerated. An elevator rope slippage judging device characterized in that 3. The rope of an elevator according to claim 2, wherein the output means outputs a car speed and a car acceleration from the deceleration start point until the elevator stops. Slip determination device. 4. The method according to claim 2, wherein the calculation means predicts the car deceleration at the next measurement from the past measurement data of the storage means and the car deceleration.
An elevator rope slippage judging device characterized in that a prediction result is outputted to the output means.