JPH09124248A - Abnormality diagnosis device for hydraulic elevator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To instantly specify a cause when abnormalities happen to a hydraulic elevator because of its control valve, thereby easily cope with abnormalities happened to a hydraulic elevator, and furthermore forecast the occurrence of abnormalities on the control valve. SOLUTION: The displacement of the rod 11a of a control valve 11 for a hydraulic elevator is detected by a displacement detector 13, its detected value is compared with basic displacement data housed in the RAM 15f of an abnormality diagnosis part 15, and when the difference between these two exceeds an allowable value determined in advance, an abnormality signal is forwarded to a monitor center 14 by way of a DPRAM 15g, a bus 15h, the bus 12h of a control part 12, and a circuit control part 12e. It can be instantly specified that abnormalities happened to the elevator have been caused by the control valve 11, and the abnormality diagnosis device can easily cope with abnormalities happened to the elevator. The maximum value and minimum value of the displacement of the rod is renewed every descending operation by the elevator, and the occurrence of abnormalities can thereby be forecasted by comparing the renewal of the displacement with data in the past.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic elevator abnormality diagnosing apparatus, and more particularly to a hydraulic elevator abnormality diagnosing apparatus suitable for detecting an abnormality and a symptom of abnormality of a hydraulic control valve for controlling the elevation of a hydraulic elevator. Regarding

[0002]

2. Description of the Related Art A hydraulic elevator raises an elevator car by supplying pressure oil from a hydraulic pump, and lowers the elevator car by discharging the supplied oil. Such a hydraulic elevator will be described with reference to FIG. FIG. 6 is a diagram showing a hydraulic elevator. In this figure, 1 is a hydraulic pump, 2 is a motor for driving the hydraulic pump 1, 3 is a power source for the motor 2, 4 is an inverter circuit for controlling the rotation of the motor 2, 5 is a tank for storing hydraulic oil, and 6 is a hydraulic pressure. Cylinder, 6p is the plunger of hydraulic cylinder 6, 7
Is a pipeline for circulating oil, 8 is a pulley rotatably attached to the plunger 6p, 9 is an elevator car, and 10 is a rope connected to the elevator car 9 via the pulley 8.

Reference numeral 11 is a control valve interposed between the hydraulic pump 1 and the hydraulic cylinder 6, reference numeral 11a is a rod attached to the control valve 11 for delivering hydraulic oil from the hydraulic cylinder 6 to the oil tank 5, and reference numeral 11b is a rod 11a. Is a stopper that suppresses the operating range of. Reference numeral 12 is an elevator control unit. 12a
Is an MP that inputs various digital signals and performs calculation and control
U and 12b are R for storing the elevator control program
OM and 12c are RAs for storing elevator control data
M and 12d are I / O for inputting / outputting signals from the car 9 and the control valve 11, and 12e is a telephone line control unit for notifying the monitoring center 14 when the elevator has a failure, 12h.
Is a bus for communication cables. A schematic configuration of the control valve 11 will be described with reference to FIG.

FIG. 7 is a hydraulic circuit diagram of the control valve shown in FIG. In FIG. 7, the same parts as those shown in FIG. 6 are designated by the same reference numerals. As shown in FIG. 6, the rod 11a includes an external rod 11a ₁ protruding outside the control valve 11 and the control valve 11
It is composed of an inner rod 11a ₂ inside and a connecting portion 11a ₃ composed of a hydraulic cylinder. Reference numeral 11b is a switching valve for supplying or discharging pressure oil, and a check valve for allowing pressure oil from the hydraulic pump 1 to the hydraulic cylinder 6 to conduct but blocking a flow in the opposite direction is provided at a left position in the drawing. ing. This switching valve 11b is constantly urged toward the rod 11a by a spring 11c at the left end of the drawing, and in that state, the switching valve 11b
The right end of b is opposed to the tip of the inner rod 11a ₂ with a minute gap. Reference numeral 11d is a solenoid valve, which is disposed in a pilot conduit 11e between the conduit 7 connected to the hydraulic cylinder 6 and the connecting portion 11a ₃ .

In the above construction, when raising the car 9, the pressure oil from the hydraulic pump 1 is supplied to the hydraulic cylinder 6 through the check valve of the switching valve 11b and the pipe line 7. As a result, the plunger 6p extends and the car 9 rises.
On the contrary, when the car 9 is lowered, when the solenoid valve 11d is excited by a command from the elevator control unit 12 shown in FIG. 6, the pilot pipe line 11e becomes conductive and the pressure oil in the pipe line 7 becomes the connecting portion 11a _3. Is supplied to. Due to this pressure, the rod 11a ₂ is displaced to the left in the figure, and the switching valve 11b is switched to the right position. On the other hand, when the car 9 descends, the motor 2 and the hydraulic pump 1 shown in FIG. 6 rotate in reverse, and the oil from the hydraulic cylinder 6 is discharged to the tank 5 via the switching valve 11b according to the rotation speed of the hydraulic pump 1. To be done. As a result,
The plunger 6p descends inside the hydraulic cylinder 6, and the car 9 descends.

[0006]

In the above-described hydraulic elevator, when the control valve 11 is abnormal, the elevator travels abnormally. For example, when the solenoid valve 11d does not operate normally, the displacement of the rod 11a _{2 to} the left in the figure becomes slower, and the switching of the switching valve 11b becomes slower.
Therefore, the discharge of the pressure oil from the pipe line 7 becomes slow, and the descending speed of the car 9 becomes slow. On the other hand, when the car 9 descends, the motor 2 and the hydraulic pump 1 are rotating at a prescribed speed. By the way, during operation of the elevator, the elevator control unit 12 causes the car 9
Descent speed (for example, detected by rotary encoder)
And the rotation speed of the motor 2 are compared with each other, and when the speeds of the two deviate from each other by a predetermined value or more, the car 9 is stopped to prevent danger. That is, when the displacement speed of the rod 11a ₂ becomes slow due to the abnormality of the control valve 11, the deviation becomes large and the car 9 stops. Of course, even when an abnormality occurs in which the rod 11a stops halfway, the car 9 also stops.

When an abnormality such as a decrease in the descending speed or an elevator stop occurs as described above, the control unit 12 reports the abnormality to the monitoring center 14 via the telephone line control unit 12e. When the monitoring center 14 receives the notification of the abnormality, it notifies the sales office in charge of the maintenance of this hydraulic elevator, and the sales office dispatches a maintenance staff to investigate the cause of the car 9 stop and finally Then, the abnormality of the control valve 11 is found and repaired to restore the hydraulic elevator. However, it takes a long time to find an abnormality inside the control valve 11 whose operating state cannot be seen,
Moreover, advanced knowledge and experience are required.

A first object of the present invention is to provide a hydraulic elevator abnormality diagnosing device which can immediately identify a hydraulic elevator abnormality when the control valve causes the abnormality, and can easily deal with the elevator abnormality. To do.

A second object of the present invention is to provide a hydraulic elevator abnormality diagnosis device capable of predicting the occurrence of an abnormality in the control valve of the hydraulic elevator.

[0010]

In order to achieve the above first object, the present invention provides a hydraulic pump, a hydraulic cylinder connected to the hydraulic pump via a pipe, and a hydraulic cylinder driven by the hydraulic cylinder. An elevator car, a rod operated by pressure oil from the pipe introduced by the excitation of an electromagnetic valve, and an oil flow to the hydraulic cylinder only when the rod is inoperative and interposed in the pipe. A displacement detector that detects a displacement amount of the rod, in an abnormality diagnosis device for a hydraulic elevator that includes a switching valve that enables a flow of oil from the hydraulic cylinder to the hydraulic pump when the rod operates. A reference data table that stores a detection value serving as a reference of the displacement detector in a predetermined period from a start command to a stop of the hydraulic elevator at predetermined intervals,
A measurement data table that stores the detection value of the displacement detector for each predetermined time every time the hydraulic elevator descends, and the measurement value of the measurement data table and the reference value of the reference data table are compared to determine a predetermined range. And an abnormality detecting means for outputting an abnormality signal when it comes off.

Further, according to the present invention, a hydraulic pump, a hydraulic cylinder connected to the hydraulic pump via a pipeline, an elevator car driven by the hydraulic cylinder, and the pipe introduced by exciting a solenoid valve. A rod which is operated by pressure oil from a passage, and which allows the oil to flow only to the hydraulic cylinder when the rod is interposed between the hydraulic cylinder and the pipe, and when the rod is activated, the hydraulic cylinder to the hydraulic pump is operated. In a failure diagnosis device for a hydraulic elevator equipped with a switching valve that enables a flow of oil, a displacement detector that detects a displacement amount of the rod, and a detection value of the displacement detector that is predetermined for each descent of the hydraulic elevator. Equipped with a measurement data table that is stored for each time, and a maximum and minimum data table that stores the maximum value and the minimum value for each predetermined time stored in this measurement data table It also features.

In the above structure, the displacement amount of the rod detected by the displacement detector at each predetermined time is compared with the reference data, and when the displacement is out of the predetermined range from the reference data, an abnormality is reported to the monitoring center. It immediately becomes clear that the anomaly is the control valve, and the elevator anomaly is easily handled. Further, the maximum value and the minimum value of the displacement amount of the rod detected by the displacement detector for each predetermined time are stored in the maximum / minimum data table. When the stored maximum value and minimum value are taken out by a portable computer or a monitoring center and the maximum value or the minimum value continuously increases or decreases for a certain period,
The abnormality of the switching valve can be predicted.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an abnormality diagnosis device for a hydraulic elevator according to an embodiment of the present invention. In this figure, the same or equivalent parts as those shown in FIG. 13 is a control valve 1
It is a displacement detector that detects the displacement amount of the first rod 11a, and is composed of, for example, a potentiometer and outputs an electric signal proportional to the displacement amount. Reference numeral 15 is an abnormality diagnosis unit of the control valve. The internal configuration of the abnormality diagnosis unit 15 will be described below.
Reference numeral 15a is an amplifier that amplifies the detection signal from the displacement detector 13, 15b is an A / D converter that converts the output of the amplifier 15a into a digital signal, and 15c is a required calculation based on the signal from the A / D converter 15b. , MPU for controlling, 15
d is a ROM that stores a diagnostic program, 15e is a timer that outputs an interrupt signal at every sampling cycle (for example, 0.05 seconds), and 15f is an RA that stores the displacement amount of the rod.
M and 15g are the elevator control unit 12 and the abnormality diagnosis unit 15
A DPRAM capable of reading both input signals and a bus 15h for a communication cable connected to the bus 12h of the control unit 12. The abnormality diagnosis unit 15 is always backed up by a battery (not shown).

FIG. 2 shows the rod 11 when the car 9 descends.
It is a figure which shows the displacement characteristic of a, Displacement X which is the amount of displacement of the rod 11a is set to vertical and horizontal, and time T is set to the horizontal axis. In this figure, A1 is a waveform that serves as a reference for the displacement characteristics of the rod 11a, a dashed-dotted line B1 is a waveform that shows the upper limit value of the reference waveform A1, and broken line B2 is a waveform that shows the lower limit value.
Displacements within the range of 1 and B2 are allowable displacements that do not hinder the operation of the elevator. Further, time T0 is the time when the acceleration command (signal to the solenoid valve 11d) from the elevator control unit 12 is turned on, and T1 is the rod 11
This is a time sufficient to complete the input of a (shift to the left in FIG. 7) and is a preset time (for example, until the acceleration command from the elevator control unit 12 is turned off). The time T2 is the time when the deceleration command from the elevator control unit 12 is turned on, and the time T3 is a time sufficient to complete the release of the rod (shift to the right in FIG. 7), and the preset time. (For example, until the traveling command from the elevator control unit 12 is turned off). Xe is the reference waveform A1
It is an allowable value that is a difference between the upper limit value and the lower limit value. The allowable value Xe will be described later.

Next, a method of setting a reference waveform A1 which is a reference value of the measured displacement data of the rod 11a and a method of determining an abnormality when the measured displacement of the rod 11a is outside the upper limit value B1 and the lower limit value B2. , And the determination method for determining the aged deterioration of the control valve 12 based on the change tendency of the displacement of the rod 11a will be sequentially described with reference to the flowcharts shown in FIGS.

FIG. 3 is a flow chart for explaining a method of setting displacement data as a reference of the rod 11a. First,
The MPU 15c of the abnormality diagnosing unit 15 determines whether or not the abnormality diagnosing unit 15 is connected to the elevator control unit 12 and is in an operating state (procedure S01), and then determines whether or not the reference displacement data has already been set. Judge whether or not (procedure S0
2). If it is determined in step S02 that the setting has been made, the process ends. In addition, when the control valve 11 is replaced, the maintenance personnel deletes the preset displacement data. In the setting preparation process of each of the steps S01 and S02, when it is determined that the abnormality diagnosis unit 15 is connected to the elevator control unit 12 and the reference displacement data is not set, the MPU 15c Predetermined signals among the signals of the control unit 12 are read out via the DPRAM 15g and the buses 15h and 12h, and based on these signals, whether or not the elevator is in the reference data input mode (for example, the elevator is in a normal operation state). It is determined whether or not there is (step S1). If in standard data input mode, then MP
U15c is an acceleration command from the control unit 12 (a descending acceleration command,
The same applies to the following acceleration and deceleration commands. ) Is output (procedure S2), and if it is output (T0 in FIG. 2), the detection of the closing displacement of the rod 11a is started every 0.05 seconds, for example, by a signal from the timer 15e. The displacement data when the 11a is turned on is stored in the RAM 15f.
It is stored in the input reference data table provided in (step S3). Next, it is determined whether or not the time (T1 in FIG. 2) from when the acceleration command from the elevator control unit 12 is turned on to when the acceleration command is turned off at which the closing of the rod 11a is completely finished (step S4), If the time has not passed, the displacement data is continuously detected and stored.

When it is determined in the process of step S4 that the time T1 has elapsed, the MPU 15c waits for the output of the deceleration command from the elevator controller 12 (step S5). When the deceleration command is output (T2 in FIG. 2), the MPU 15c causes the timer 1
Based on the signal from 5e, similarly to the above, detection of displacement data of the rod 11a at the time of release is started every 0.05 seconds, and this is sequentially stored in the release reference data table provided in the RAM 15f (step S6). The time from the deceleration command ON from the elevator control unit 12 to the travel command OFF at which the release of the rod 11a is completely completed (T3 in FIG. 2).
Is determined (step S6), and if not, the displacement data detection and storage are sequentially continued. In the process of step S6, when it is determined that the time T3 has elapsed, the setting of the reference data when the rod 11a is inserted and when the rod 11a is released is completed.

Next, the MPU 15c copies the throwing-in reference data obtained by the above processing to the throwing-in maximum value data table and the throwing-in minimum value data table provided in the RAM 15f (step S8). The release reference data obtained by the processing is copied to the release maximum value data table and the release minimum value data table provided in the RAM 15f (step S9). These procedures S
8 and the input maximum value data table, the input minimum value data table, the release maximum value data table, and the release minimum value data table obtained by the processing of step S9,
Required data is stored during processing in the abnormality determination described below, and is finally used as a data table to be used for determination of aged deterioration described later.

In the above process, the input reference data and the release reference data are obtained by one operation of the rod 11a, but the present invention is not limited to this, and the input and release operations of the rod 11a are performed a plurality of times. , Each time rod 11a
The average value of the displacement data at each sampling time may be stored in the input reference data table and the release reference data table as the input reference data and the release reference data.

By the above processing, the input reference data and the release reference data of the displacement data of the rod 11a can be set. Next, a determination method for determining whether or not the actually measured displacement data of the rod 11a is abnormal using the reference data set in this way will be described with reference to the flowchart shown in FIG.

First, the allowable value Xe used in this determination method will be described. This permissible value Xe is a value that determines the limit of the difference between the actually detected closing displacement data and the releasing displacement data when the closing reference data and the releasing reference data obtained by the above processing are different. It is set to a value that does not cause a failure. This tolerance Xe is shown in FIG. 2 and is determined experimentally and is usually constant for any hydraulic elevator. This tolerance X
e exists in the program of the ROMU 15d as a constituent element of the program and is used in the processing procedure.

The MPU 15c of the abnormality diagnosis section 15 is a ROM
According to the program stored in 15d, the control unit 12 of the elevator monitors the current situation at any time, and determines whether the elevator is in the measurement data input mode (for example, whether the elevator is in a normal operation state). (Procedure S10). When entering the measurement data input mode, MPU15
c is an acceleration command of the elevator control unit 12 (T0 in FIG. 2)
Is checked (procedure S11), and when the acceleration command is turned ON, the displacement of the rod 11a is changed every 0.05 seconds by the signal from the timer 15e of the abnormality diagnosing unit 15, as in the case of the displacement data setting. The data is stored in the input measurement data table provided in the RAM 15f (step S12),
Whether the stored injection measurement data is compared with the data stored in the injection reference data table at the same sampling time (data area) as the injection measurement data, and whether the absolute value of the difference between them exceeds the allowable value Xe. It is determined whether or not (step S13), and when the allowable value Xe is exceeded, it is determined that the control valve 11 has an abnormality, and
An abnormality is reported to the monitoring center 14 by the telephone line control 12e shown in FIG. 1 (step S14). Upon receiving the notification, the monitoring center 14 immediately informs the sales office that manages the elevator, and the sales office dispatches a maintenance staff to investigate the control valve 11 for replacement or repair.

When it is determined by the processing of step S13 that the allowable value Xe is not exceeded, the MPU 15c determines that the input measurement data is the data at the corresponding sampling time of the current input maximum value data table (initially the input maximum value data table Is larger than the reference data is stored.) (Step S15), and if not larger, it is next judged whether it is smaller than the input minimum value data (step S1).
6). When it is determined in step S15 that it is large, the input measurement data is stored as data in the corresponding data area of the input maximum value data table in place of the previously stored data (step S17). Step S16
If it is determined to be small, the input measurement data is
The data in the corresponding data area of the input minimum value data table is stored in place of the previously stored data (step S19). Further, when it is determined in step S16 that it is not smaller, that is, when the injection measurement data matches the injection reference data, the time from when the acceleration command from the elevator control unit 12 is turned on to when it is turned off ( It is determined whether (T1 in FIG. 2) has elapsed (step S1).
9) If the time has not elapsed, the process after step S12 is repeated again. When it is determined that the time has passed in the process of step S19, the comparison of the input measurement data and the storage of the maximum value and the minimum value are ended.

Then, in the same manner as described above, the release measurement data is loaded, and the maximum value and the minimum value of the release measurement data are stored. That is, the MPU 15c
When it is determined in the process of step S19 that a certain time has elapsed (time T1 has been reached) after the acceleration command is turned on, it is next determined whether or not the deceleration command in the control unit 12 is turned on (step S20). . When the deceleration command turns ON, timer 1
Based on the signal from 5e, the length measurement displacement data of the rod 11a is stored in the release measurement data table provided in the RAM 15f every 0.05 seconds (step S21), and the stored release measurement data and the same data as this release measurement data are stored. It compares with the data stored in the above-mentioned release standard data table of the area, and judges whether or not the absolute value of the difference between them exceeds the allowable value Xe (step S22), and exceeds the allowable value Xe. In this case, it is determined that the control valve 11 has an abnormality, and the control unit 12 is caused to report the abnormality to the monitoring center 14 (step S
14). Upon receiving the notification, the monitoring center 14 immediately performs the above-mentioned treatment.

When it is determined by the processing of step S22 that the allowable value Xe is not exceeded, the MPU 15c determines that the release measurement data is the data in the corresponding data area of the current release maximum value data table (first in the release maximum value data table, Is larger than the reference data is stored.) (Step S23), and if not larger, it is next judged whether or not smaller than the release minimum value data (step S24).
If it is determined to be large in step S23, the release measurement data is stored as data in the corresponding data area of the release maximum value data table in place of the previously stored data (step S25). When it is determined in step S24 that it is smaller, the release measurement data is stored as data in the corresponding data area of the release minimum value data table in place of the previously stored data (step S26). If it is determined in step S24 that it is not smaller, that is, if the release measurement data matches the release reference data, the time from when the deceleration command from the elevator control unit 12 is turned on to when it is turned off ( Figure 2
It is determined whether or not T3) has passed (step S27), and if it has not passed, the processing after step S21 is repeated again. When it is determined that the time has passed in the process of step S27, the process of comparing the release measurement data and storing the maximum value and the minimum value is ended. This process is performed every time the hydraulic elevator descends.

Next, a method of determining the deterioration of the control valve 11 over time will be described. In the process shown in FIG. 4, the maximum value data table of the RAM 15f of the abnormality diagnosis unit 15 stores the maximum value of the displacement of the rod 11a on the injection side after the control valve 11 is installed for each data area. Similarly,
The input minimum value data table stores the input side minimum value, the release maximum value data table stores the release side maximum value, and the release minimum value data table stores the release side minimum value. The determination of aged deterioration is performed by the monitoring center 14 using these four data tables.

That is, the operator of the monitoring center 14 reads out the above four data tables from the RAM 15f of the abnormality diagnosing unit 15 via the control unit 12 every predetermined period (for example, one month) and stores them in the storage of the monitoring center 14. Sequentially stored in the department. Next, including the data table read this time, a data table for a predetermined number of months (for example, 5 months) following this is taken out from the storage unit and displayed or printed, for each same data area of the same data table. Compare the data. Then, for example, in the case of the maximum input value data table, if there is data that continuously increases for 5 months, it is determined that the operation of the control valve 11 may be hindered due to deterioration over time, and the elevator is managed. Contact the sales office and instruct to replace the control valve 11. Thereby, the self-generation of the control valve 11 can be prevented in advance.

The operator of the monitoring center 14 determines the above-mentioned deterioration over time.
It can also be performed by a computer. A flow chart in that case is shown in FIG. First, the operator of the monitoring center 14 instructs the computer to determine aged deterioration (step S30). The computer retrieves the above four data tables from the RAM 15f of the abnormality diagnosis unit 15 via the control unit 12 (procedure S31) and stores these in the storage unit (procedure S32). Next, the data tables of the past five months including the fetched four data tables are fetched and the data is compared for each same data area of the same data table (step S33). In this comparison, if it is determined that the data continuously increases in the same data area of the maximum input value data table or the maximum release value data table (step S34), the control valve 11 has deteriorated over time. Therefore, the fact that the replacement is necessary is displayed on the display or printed (step S35). If it is determined that there is a continuous decrease in the input minimum value data table or the release minimum value data table even if there is no continuous increase in the input maximum value data table or the release maximum value data table (step S36). The process of step S35 is performed.

As described above, the reference displacement data setting, the abnormality determination,
And the aging deterioration judgment was described. As described above, in the present embodiment, the displacement detector 13 is attached to the rod 11a of the control valve 11, the displacement data that is the reference of the displacement of the rod 11a is set, and this displacement data is compared with the actual displacement data. Since the latter is designed to judge whether the former is within the allowable value or not, the elevator abnormality is caused by the control valve 1
If the abnormality is 1, the abnormality can be identified immediately, and the abnormality of the elevator can be easily dealt with. Further, the maximum value and the minimum value of the displacement of the rod 11a are updated for each descending operation of the elevator, and this is compared with the past data, so that it is possible to predict the occurrence of an abnormality in the control valve 11, and thus the car 9 It is possible to avoid the stoppage of the elevator, the inoperability of the elevator for a long time in that case, and the investigation of the cause.

In the present embodiment, the measurement of the displacement data has been described by using the rod 11a, but it is not limited to the rod 11a as long as it is inside the control valve 11, and, for example, even when the switching stroke of the switching valve 11b is detected. Good. Further, the maximum and minimum value data of the displacement of the rod 11a is read out by the monitoring center 14, but a portable computer is connected to the abnormality diagnosing section 15 at the time of the maintenance work of the maintenance personnel, which is performed on a regular basis. It is also possible to output data to and to determine aged deterioration based on this data.

[0031]

As described above, according to the present invention, the displacement detector for detecting the displacement of the rod of the control valve or the switching valve is provided, the displacement data serving as the displacement reference is set, and this displacement data and the actual displacement data are set. Since it is determined whether the latter is within the allowable value for the former by comparing with the displacement data, if the abnormality of the elevator is the abnormality of the control valve, it can be specified immediately. As a result, it is possible to easily deal with the abnormality of the elevator. Furthermore, the maximum and minimum values of the displacement of the rod or switching valve are updated each time the elevator descends, and this is compared with past data, so it is possible to predict the occurrence of an abnormality in the control valve. It is possible to avoid the stoppage of the elevator, the inoperability of the elevator for a long time in that case, and the investigation of the cause.

[Brief description of the drawings]

FIG. 1 is a diagram showing an overall configuration including an abnormality diagnosis device for a hydraulic elevator according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating displacement data measured by a displacement detector shown in FIG.

FIG. 3 is a flowchart illustrating an operation of the abnormality diagnosis device shown in FIG.

FIG. 4 is a flowchart illustrating an operation of the abnormality diagnosis device shown in FIG.

5 is a flowchart illustrating an operation of the abnormality diagnosis device shown in FIG.

FIG. 6 is a diagram showing a conventional hydraulic elevator.

7 is a hydraulic circuit diagram showing the configuration of the control valve shown in FIG.

[Explanation of symbols]

 11 Control valve 11a Rod 12 Control part 12e Line control part 13 Displacement detector 14 Monitoring center 15 Abnormality diagnosis part 15b A / D converter 15c MPU 15e Timer 15f RAM 15g DPRAM

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

Claims (4)

[Claims] 1. A hydraulic pump, a hydraulic cylinder connected to the hydraulic pump via a pipeline, an elevator car driven by the hydraulic cylinder, and a pressure from the pipeline introduced by excitation of a solenoid valve. An oil-operated rod, which is interposed in the conduit and allows only the oil flow to the hydraulic cylinder when the rod is inoperative, and allows the oil flow from the hydraulic cylinder to the hydraulic pump when the rod operates. In an abnormality diagnosis device for a hydraulic elevator including a switching valve that enables the displacement detector that detects the displacement amount of the rod or the switching valve, and the displacement in a predetermined period from a start command to a stop of the hydraulic elevator. A reference data table that stores a detection value serving as a reference of the detector at predetermined time intervals, and a detection value of the displacement detector at predetermined time intervals each time the hydraulic elevator descends. A measurement data table to be stored, and an abnormality detection means for comparing the measurement value of the measurement data table with the reference value of the reference data table and outputting an abnormality signal when the measured value is out of a predetermined range. Abnormality diagnosis device for hydraulic elevator. 2. The hydraulic elevator abnormality diagnosing device according to claim 1, further comprising communication means for transmitting the abnormality signal to a monitoring center that is remotely monitored via a communication line. Abnormality diagnosis device. 3. A hydraulic pump, a hydraulic cylinder connected to the hydraulic pump via a pipeline, an elevator car driven by the hydraulic cylinder, and a pressure from the pipeline introduced by exciting a solenoid valve. An oil-operated rod, which is interposed in the conduit and allows only the oil flow to the hydraulic cylinder when the rod is inoperative, and allows the oil flow from the hydraulic cylinder to the hydraulic pump when the rod operates. In an abnormality diagnosis device for a hydraulic elevator equipped with a switching valve that enables the displacement detector that detects the displacement amount of the rod or the switching valve, and the detection value of the displacement detector for each predetermined time when the hydraulic elevator descends. A measurement data table to be stored for each time, and a maximum and minimum data table for storing the maximum value and the minimum value for each predetermined time stored in this measurement data table are provided. An abnormality diagnosis device for a hydraulic elevator, characterized by: 4. The abnormality diagnosis device for a hydraulic elevator according to claim 3, wherein the maximum and minimum data table is retrieved by at least one of a portable computer carried by a maintenance person and the monitoring center.