JPH0735232B2 - Elevator maintenance diagnostic device - Google Patents

Description

The present invention relates to an elevator control device, and more particularly to a control device suitable for improving the maintainability of a microcomputer elevator.

[Conventional technology]

Conventionally, for microcomputer-controlled elevators,
Industrial Machinery December 1984 Issue 40 "Special Issue on the Latest Elevators"
Pp. 43. Among them, the microcomputer exerts its functions such as normal elevator operation control, speed control, detailed management control, etc., and it has a preventive maintenance function such as a follow-up investigation of the elevator operation status, and the result is automatically No attention was given to the warnings or to contact other departments.

[Problems to be solved by the invention]

The above-mentioned conventional technology does not consider automatically checking the fluctuations and deterioration of the equipment due to the operation of the elevator and notifying the maintenance personnel of the elevator. In the maintenance service aspect, a maintenance method that is not very noticeable was adopted, such as deterioration of the equipment being found and there is no choice but to replace it, and therefore, the equipment is replaced only when trouble occurs.

Also, as in Japanese Utility Model Laid-Open No. 55-32380, by providing a dedicated microcomputer, when the number of elevator starts (distance traveled) reaches a specified value, an alarm is displayed to that effect, and the number of remaining starts before the alarm is reached. Is displayed, and free setting such as the number of activations is performed. However, in addition to being maintenance-only and not economical, it was not sufficient in terms of contributing to the operational safety as an elevator.

An object of the present invention is to provide a maintenance diagnosis device using a microcomputer that solves the above-mentioned drawbacks, is economical, and contributes to the improvement of operational safety as an elevator.

[Means for solving problems]

A feature of the present invention is that, in an elevator controlled by a control device equipped with a microcomputer, means for causing the microcomputer to execute processing required for normal elevator operation by a timer interrupt, and normal operation processing by the timer interrupt. Is started every time the above is finished, it is interrupted by the next timer interrupt, and means for causing the microcomputer to intermittently perform monitoring recording processing so as to take over to the next processing opportunity, and for the compensation rope that descends due to extension of the main rope Means for detecting the position of the pulley in a plurality of stages, memory capable of writing and erasing and self-holding at the time of power failure, and elevator operating status including the output of the pulley position detecting means are stored in the memory based on the monitoring recording process. Depending on the writing and recording means and the detection output of the first stage by the pulley position detecting means Means for generating an alarm based on the monitoring recording process is to provided a means for stopping the elevator on the basis of the monitoring the recording process in accordance with the detected output of the second stage by the pulley position detecting means.

[Operation] Paying attention to the fact that the monitoring and recording process does not require high-speed processing such that the entire process is completed each time, and by effectively utilizing the idle time of the elevator control microcomputer, a special dedicated microcomputer is used. The monitoring recording process is executed without preparing the above.

Next, the operating status of the elevator, which should be monitored and recorded, can be reliably recorded and saved, and there is no risk of overlooking the danger.

Furthermore, alarms are issued at the level at which the rope should be truncated when the main rope of the elevator that changes gradually or changes rapidly at a certain time is alerted to prevent accidents of car trapping due to an emergency stop. At the same time, the elevators will be stopped in an emergency to ensure the safety of passengers when the rope stretches at a dangerous level.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG. 1 is an elevator car, 2 is a counterweight, 3 is a main rope, 4 is a compensating rope, 5 is a sheave, 6 is a compensating rope pulley, 7 is a motor, and 8 is an encoder directly connected to the motor shaft. The operation of the components is controlled by the following microcomputer system. 11 is a microprocessor (MPU), 12 is RAM, 13 is a ROM that contains a program for controlling elevator operation, and 14 is an interface L
The SI controls the input / output device 15 that controls each device of the elevator. 16 is a programmable timer module (PT
M), counting the pulses of the encoder 8,
The numerical value is output to the microcomputer side. Reference numeral 17 is an A / D converter, which is an LSI that converts an analog input into a digital output. 18 is RA with battery 19 for backup when power failure
M is a memory for recording the operating state of the elevator of the present invention. An electrically writable and erasable ROM (EEPROM) may be used instead of the memory with a backup and backup. 20 is a PROM with a built-in program for monitoring and recording the operating status of the elevator, which is preferably an electrically writable and erasable EEPROM. Reference numeral 21 denotes a writer for writing a program in the EEPROM 20, which has a function of converting the mode of the EEPROM 20 into a write mode and writing data (program) at a predetermined address. Reference numeral 22 denotes a keyboard display LSI, which has a function of taking in information from the input keys 23 and notifying the microcomputer 11 thereof, and simultaneously displaying necessary information on the 7-segment display device 24. 25 is for serial communication
It is an LSI and is connected to the monitoring device 26 in the building management room by a communication line 27. 28 is a bus connector, which can be connected to the outside as needed. 31 is a position detecting device for the compensation rope pulley 6 of an example of the present invention described later, 32 is a vibration proof rubber, 33 is a differential transformer (for load detection) 34A, 34B is a distance confirmation switch, and 35 is attached to the car 1. It is a magnet.

With the above-described configuration, the elevator operates the MPU 11 by the program built in the PROM 13 to perform normal operation control. Next, a program for monitoring and recording the operating status of the elevator constituent device according to the present invention is shown in FIG.
This is done by the EEPROM 20. As shown in the program execution sequence diagram of FIG. 2, this program executes the normal operation control program A by the periodic interruption of the timer interruption T, and after the processing of this program A is completed, It is executed until there is a timer interrupt.
(B program in FIG. 2) Since the state monitoring recording program B is not required to perform high speed processing, even if the processing is interrupted due to the next timer interrupt, it is continuously processed during the execution of the next program B. , A predetermined monitoring and recording function is completed.

Next, an example of a concrete operating state monitoring recording program of the elevator constituent device will be described.

FIG. 3 shows a device for checking the extension of the main rope, and FIG. 4 is its monitoring program. In FIG. 3, 4 is a compensating rope, 6 is a compensating rope pulley,
When the main rope stretches over time, the pulley 6 gradually lowers,
Finally, the pit floor is touched, which is dangerous. Reference numeral 31 is a device for checking the extension of the main rope, 31X is a magnet attached to the shaft of the pulley 6, and 31A to 31M are magnetic sensing switches installed in the pit at equal intervals. (The number of this switch varies depending on the length of the main rope, but in this invention, the number is secondary.) This switch turns ON when facing the magnet 31X, and then turns ON.
It has the function to memorize. Figure 4 is a program to check the elongation of the main rope. When 31B before the last stage of the switch is turned ON, a rope cut warning is issued and sent to the monitoring panel 27 via the signal transmission line 27 (Fig. 1), and the elevator is stopped when the last 31A is turned ON. I am trying. Before 31B and 31A are turned on, 31L and 31K
The status record memory 18 (Fig. 1)
Is recorded in the display device 24 by operating the input device 23.
It can also be displayed on. In the above embodiment, the elevator maintenance diagnosis apparatus according to the present invention is configured as follows. That is, in the elevator controlled by the control device equipped with the microcomputer, the MPU is executed by the program stored in the ROM 13 of FIG.
11 is configured to configure "a means for causing the microcomputer to execute a normal operation process required for normal operation of an elevator by a timer interrupt", and also in FIG. 1, a program for monitoring and recording the operation status of the elevator Operate the MPU11 by the program of the built-in ROM20, "started every time the normal operation processing by the timer interrupt is completed, interrupted by the next timer interrupt and taken over to the next time, the monitoring recording processing is intermittently performed. The position detecting device 31 of the compensating rope pulley 6 shown in FIG. 1, specifically, the magnet 31X attached to the shaft of the pulley 6 shown in FIG. 3, and the magnet 31X installed in the pit at equal intervals. A device 31 for checking the extension of the main rope, which includes magnetic sensing switches 31A to 31M, is used to describe "a supplementary device that descends due to the extension of the main rope. Means for detecting separately the position of the pulley rope multiple stage "
And has the backup battery 19 at the time of power failure in Fig. 1
The program that checks the extension of the main rope of Fig. 4 is executed at the timing of B of Fig. 2. From MPU11, RAM12, ROM13, interface LSI14, I / O device 15, PTM16, A / D converter 17, etc. based on the program stored in ROM20 that contains the program for monitoring and recording the elevator operation status A device for checking the extension of the main rope, which constitutes a "means for writing and recording the elevator operation status including the output of the pulley position detecting means in the memory (18) based on the monitoring recording processing" by the microcomputer 31 When 31B, which is immediately before the last stage of the switch, is turned on, that is, in response to the detection output of the first stage by the pulley position detecting means,
Based on the program stored in the ROM 20, the microcomputer of the MPU 11 or lower issues a rope cut warning to the monitoring board 27 by using the serial communication LSI 25, the building management room monitoring device 26 and the communication line 27.

Thereby, "a means for issuing an alarm based on the monitoring and recording processing in accordance with the detection output of the first step by the pulley position detecting means" is configured, and further, the switch of the device 31 for checking the extension of the main rope. When the final stage 31A is turned on, that is, in response to the detection output of the second stage by the pulley position detecting means, based on the program stored in the ROM 20, the I / O device 15 or the like is operated by the microcomputer of the MPU 11 or lower. To output to the motor 7 via the motor, and constitutes "a means for stopping the elevator based on the monitoring and recording processing according to the detection output of the second stage by the pulley position detecting means".
A maintenance diagnostic device for an elevator according to the present invention is configured.

FIG. 5 and FIG. 6 are examples of programs for checking the flexure of the anti-vibration rubber under the car over time. Anti-vibration rubber under the basket
The bending of 32 is promoted by the differential transformer 33, and the load in the car is detected. Normally, the output of the differential transformer is shown in FIG.
As described in (1), the output is set to zero when the load inside the car is zero (no load), and the output is linearly increased as the load increases. (The solid line in Fig. 5 (a)) However, the flexure of the anti-vibration rubber changes over time, and the differential transformer outputs even when the load is zero. If this amount increases, the elevator start Therefore, it is necessary to readjust the mounting of the differential transformer. In the past, after this start-up was large, readjustment was sometimes made, and the customer sometimes complained. Therefore, this time, the program of FIG. 6 is started to monitor the state of the deflection of the vibration-proof rubber, and the differential transformer is readjusted in advance. That is, in FIG. 6, the presence or absence of a call in the elevator car and the fact that 3 minutes have passed since it disappeared is checked (this checks that there are no passengers in the car). The output of the dynamic transformer is taken into the microcomputer and its level is judged. It goes without saying that a predetermined alarm is issued when the size becomes abnormally large.

7 and 8 show a program for monitoring the wear of the sheave 5. When the sheave 5 is worn, the traveling distance of the elevator per one rotation of the sheave 5 is reduced. The rotation speed of the sheave 5 can be detected by the number of output pulses of the encoder 8 directly connected to the shaft of the motor 7. Therefore, the wear condition of the sheave can be determined by counting the number of pulses of the encoder when the elevator travels the specified travel distance. Fig. 7 shows the magnet 35 mounted on the car and the magnetic detection switch 34A, which is fixed in the elevator tower and has a specified distance.
It is a figure which shows the relationship of 34B. For example, when 35 and 34A face each other, 34A turns on, and when 35 and 34B face each other, 34B turns on. 8th
The figure shows the flow chart of the program.When the elevator descends, the count value of the encoder when 35 faces 34A is stored, then the count value when 35 faces 34B is stored, and the difference is stored. If the calculated value exceeds a predetermined value γ, it is judged that the sheave wear is large and a warning that the sheave needs to be replaced is issued.

9 and 10 show a program for issuing a replacement instruction based on the number of times the fluorescent lamp blinks.

FIG. 9 is a program for calculating the number of times the fluorescent lamp blinks,
FIG. 10 is a program for determining replacement of a fluorescent lamp. Generally, it is said that the life of a fluorescent lamp is determined by the number of times it blinks. By starting this program, it is possible to implement a replacement measure (preventive maintenance) before the fluorescent lamp becomes unlit.

Figure 11 is a program that automatically detects and issues an alarm when the main rope is replaced. The elevator operating time T _S is added up, collated with the replacement record, and an alarm is automatically issued when the specified operating time has elapsed.

The specific examples of the present invention have been described above, but other than that, the maintenance program is an EEPROM (electrically programmable erasable
ROM) and the EEPROM writer can be operated by the input key to write an arbitrary program. By setting a maintenance program suitable for the customer's elevator, appropriate preventive maintenance can be performed. Has the effect that can be implemented.

In addition, since the recorded operating status of the elevator (non-volatile during power failure) can be output as necessary, it is possible to perform appropriate elevator maintenance based on the status.

〔The invention's effect〕

According to the present invention, without preparing a dedicated microcomputer,
A maintenance diagnostic device that economically supports maintenance work by utilizing the idle time of the microcomputer for elevator control, and also contributes to the improvement of safety as an elevator by stopping the elevator when it is dangerous. Can be provided.

[Brief description of drawings]

FIG. 1 is an elevator control device of the present invention, FIG. 2 is an explanatory view of a program processing method of the present invention, FIG. 3 is an embodiment of the present invention, FIG. 4 is the above program flow chart, and FIG. Another embodiment of the present invention, FIG. 6 is the above flow chart, FIG. 7 is another embodiment of the present invention, FIG. 8 is the above flow chart, and FIG. 9 is another embodiment of the present invention. FIG. 10 shows the above-mentioned flow chart, and FIG. 11 shows another embodiment of the present invention. 11 …… MPU, 12 …… RAM, 13 …… ROM, 14 …… Interface LSI, 15 …… I / O device, 18 …… Self-maintainable memory during power failure, 20 …… Elevator operating status is monitored and recorded PROM with built-in program, 26 ... Monitoring device in control room.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Minoru Okawa 4-6 Kanda Surugadai, Chiyoda-ku, Tokyo Inside Hitachi, Ltd. (56) References JP-A-58-207264 (JP, A) JP-A-55- 52872 (JP, A) Actually opened 55-32380 (JP, U)

Claims (1)

[Claims] 1. In an elevator controlled by a control device having a microcomputer, means for causing the microcomputer to execute normal operation processing required for normal operation of the elevator by means of a timer interrupt, and normal operation processing by the timer interrupt being completed. Each time it is started, the means for causing the microcomputer to perform monitoring recording processing intermittently so that it is interrupted by the next timer interrupt and taken over to the next time, and the position of the compensation rope pulley that descends due to the extension of the main rope are set. Means for detecting in multiple stages, memory capable of writing / erasing and self-holding in case of power failure, elevator operating status including output of the pulley position detecting means is written and recorded in the memory based on the monitoring and recording processing. And a means for performing the first stage detection output by the pulley position detecting means. Means for issuing an alarm based on the visual recording processing, and means for stopping the elevator based on the monitoring recording processing in response to the detection output of the second stage by the pulley position detecting means are provided. Elevator maintenance diagnostic device.