JP3408936B2 - Diagnosis device for hydraulic elevator - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for diagnosing abnormality of a hydraulic elevator, and more particularly to a device for diagnosing abnormality of a hydraulic elevator for elongating a main rope. 2. Description of the Related Art Conventionally, in an indirect hydraulic elevator, the elongation of a main rope is measured during maintenance work such as periodic inspection, and when the elongation of the main rope is equal to or more than a predetermined value, the elongation of the main rope is increased. Take measures such as cutting down the amount
The plunger and the car had a regular relative positional relationship. It is also conceivable to predict the amount of elongation of the main rope in an elevator. The quantity was difficult to predict. In view of the above, according to the published technical report 87-10374, when the detector for detecting the top floor of the car and the plunger overshoot detector both operate at the same time, the rope elongation of the hydraulic elevator is set to output a warning of the main rope elongation. A detecting device is shown.
Japanese Patent Application Laid-Open No. 1009833 also discloses a hoisting rope elongation detecting device for an indirect hydraulic elevator similar to that described above. [0003] However, in the above-described conventional rope elongation detecting device, when the elevator is driven to the top floor during normal operation and reaches the top floor, the predetermined value is not reached until the elevator reaches the top floor. In order to detect whether or not the main rope elongation has occurred, when the main rope elongation is detected, it is a situation in which the adjustment work needs to be performed immediately.
If the adjustment work is not performed immediately on this occasion, there is a risk that the landing level may be deviated, or that the vehicle does not arrive at the top floor, leading to a confinement accident. It is an object of the present invention to provide a hydraulic elevator abnormality diagnosis apparatus capable of diagnosing the amount of extension of a main rope sufficiently in advance of a situation where an adjustment operation is urgently required. SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a hydraulic elevator having a car which is lifted and lowered by a plunger via a main rope, and detects an abnormal elongation of the main rope. In the abnormality diagnosis device, the top-floor car over-pass detection means for detecting the position of the car above the top floor, and the above-described top-floor car over-pass detection in a normal state where the main rope is not stretched. Rising above the installation position of the means
The top-floor riding car described above to operate after the car rises
The plunger overshoot detection means provided at a predetermined distance from the overshoot detection means, and the plunger overshoot detection means when the car is further raised above the top floor and the top floor car overshoot detection means operates. An abnormality diagnosis unit that determines that the main rope is in an abnormally stretched state when the means operates. The abnormality diagnosis device for a hydraulic elevator according to the present invention performs a diagnosis operation in which the plunger is further raised from the top floor level to raise the car, and the car is stopped by the operation of the top floor car overrun detection means. When the plunger rises above the normal position and the plunger overshoot detection means operates, an abnormality diagnosis unit is provided to determine that abnormal elongation of the main rope has occurred. It is possible to diagnose abnormal elongation of the main rope shortly before reaching the elongation that causes an improper landing level, so that even if adjustment work is performed thereafter, it does not arrive at the top floor as in the past. It does not lead to confinement accidents. Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a hydraulic elevator abnormality diagnosis apparatus according to one embodiment of the present invention. A hydraulic control unit 4 including an oil tank, a pump, an electric motor for driving the pump, a control valve for controlling the flow rate of hydraulic oil, and the like is connected to a cylinder 6 via a pipe 5 for sending pressure oil. I have. A hydraulic jack device is configured by combining a plunger 7 that moves up and down with pressure oil in the cylinder 6. A pulley 8 installed on the top of the plunger 7 and rotatable in the circumferential direction includes:
A main rope 9, one end of which is fixed, is wound around the lower part of the cylinder 6, and the other end of the main rope 9 is connected to a car 12. A plunger cam 10 is fixed to the top of the plunger 7, and a plunger overshoot detection limit switch 11 that operates by passage of the plunger cam 10 is installed on a hoistway facing the plunger cam 10.
Plunger overshoot detecting means is constituted. A car cam 13 is fixed to the car 12, and the car cam 13 is mounted on a hoistway facing the car cam 13.
The upper limit car overrun detection limit switch 14 which is operated by passing of the vehicle is installed, and the top floor ride overrun car detection means is configured. The elevator operation control device 1 that receives signals from the plunger overrun detection limit switch 11 and the top floor car overrun detection limit switch 14 controls the hydraulic control unit 4. The elevator operation control device 1 includes an abnormality diagnosis unit 2
And a monitoring center 3 for monitoring the operating state of the hydraulic elevator via a telephone line. The elevator operation control device 1 includes an arithmetic processing unit (MPU) 1a for performing an operation in accordance with a control program based on various data and control device signals to control the operation of the hydraulic elevator, and a control program for the hydraulic elevator. A ROM 1b for storing, a RAM 1c for storing control data of the hydraulic elevator, a bus 1d for transmitting signals in the operation control device 1, and an input / output device (I / O) for inputting / outputting signals to / from controlled devices. / O) 1e. The abnormality diagnosis unit 2 performs an operation in accordance with an abnormality diagnosis program to perform abnormality diagnosis of the hydraulic control circuit, or performs an operation of issuing an elevator diagnostic operation command to the elevator operation control device 1 to perform a diagnostic operation. A processing unit (MPU) 2a, a ROM 2b for storing an abnormality diagnosis program, and a RAM 2c for storing an initial value for abnormality diagnosis, a reference value for abnormality determination, data of an abnormality diagnosis result, a diagnosis operation start date and time, and the like. , Abnormality diagnosis device 2
And a DP for taking out the signal of the operation control device 1 calculated by the MPU 1a and output on the bus line of the bus 1d via the bus 2d and storing the signal.
It has a RAM 2e and a telephone line interface (I / F) 2f that controls connection to a telephone line for transmitting and receiving data to and from the monitoring center 3. Next, the operational relationship between the above-described plunger overshoot detection limit switch 11 and the top floor car overshoot detection limit switch 14 will be described. Although the length of the main rope 9 is normal and the car 12 is at the top floor level or lower, both are inoperative, but the plunger 7 is further raised above the top floor level and the car linked therewith. If 12 rises, the car cam 13
Will operate the limit switch 14 for detecting the excessive passage of the car on the top floor, and upon receiving this signal, the elevator operation control device 1 stops the elevator. At this time, the limit switch 11 for detecting the overshoot of the plunger is installed in a place where it does not operate and remains in a non-operating state. However, even if the car 12 is at the top floor level and the limit switch 11 for detecting excessive passage of the plunger and the limit switch 14 for detecting excessive passage of the car on the top floor are both in a normal state, the main rope 9 is extended. Then, when the car 12 is raised by further raising the plunger 7 from the top floor level, even if the elevator stops at the normal position due to the normal operation of the upper limit car overrun detection limit switch 14, the plunger 7 is higher than the normal position by about half of the amount of extension of the main rope 9, so that the plunger can be moved from the running state to the stop on the top floor of the car by the operation of the limit switch 14 for detecting the over-travel of the car. The overshoot detection limit switch 11 operates. When the main rope 9 further extends, when the plunger 7 is further raised from the top floor level to raise the car 12, the upper limit floor car overrun detection limit switch 14 is operated before the plunger movement. The limit switch 11 for passing detection operates and the elevator stops. The above-mentioned abnormality diagnosis section 2 detects the elongation of the main rope 9 at an early stage by grasping the operational relationship between the limit switch 11 for detecting the overrun of the plunger and the limit switch 14 for detecting the overrun of the car on the top floor. Next, diagnosis of the amount of extension of the main rope 9 will be described with reference to the flowchart shown in FIG. First, FIG.
In step S1, the MPU 2a of the abnormality diagnosis unit 2 determines whether or not it is the elevator operation start date and time stored in the RAM 2c in advance. If the result of the determination is negative, that is, if the diagnosis operation start date and time of the elevator has not been reached, the process is terminated and the process returns to step S1 again. On the other hand, if it is determined in step S1 that the date and time is the diagnostic operation start date and time,
Then, it is determined whether the diagnostic operation permission signal is ON or not, that is, whether the start of the diagnostic operation is appropriate for the operating state of the elevator. Here, the diagnostic operation permission signal is to be turned on when the elevator is in a normal standby state with the door closed and there is no passenger in the car 12, and is turned off when any of the conditions is not satisfied. And In this step S2, the diagnostic operation permission signal is turned off.
If it is determined to be F, the process ends and the process returns to step S1 again. On the other hand, when the diagnostic operation permission signal is determined to be ON,
In step S3, the ROM 2b of the abnormality diagnosis unit 2 generates a command to cause the elevator operation control device 1 to perform a diagnosis operation. The contents of the diagnostic operation are as follows. First, an elevator at an arbitrary floor is driven to the top floor, and it is confirmed again that the diagnostic operation permission signal is ON. Switch to maintenance mode. Thereafter, the ascending operation is further performed from the top floor level, and the top switch of the upper limit car for over-pass detection or the plunger over-pass detection limit switch 1 is performed.
The distance until the elevator stops in the operation 1 is measured by the MPU 2a of the abnormality diagnosing unit 2, and the distance is stored in RAM
2c. At this time, the RAM 2c also stores which of the limit switch 14 for detecting the car passing on the top floor and the limit switch 11 for detecting the passing of the plunger has stopped in the RAM 2c. In addition, the operation status of the top-of-the-floor overpass detection limit switch 14 and the plunger over-the-pass detection limit switch 11 after the stop is checked. The abnormality diagnosis unit 2 determines whether both the limit switch 14 for detecting the car passing on the top floor and the limit switch 11 for detecting the passing of the plunger and whether only the limit switch 11 for detecting the passing of the plunger is operating. RAM2c
To memorize. Thereafter, the ROM 2b generates an operation command to lower the car 12 to the top floor level, and terminates the diagnostic operation processing when the car 12 reaches the top floor level. After the diagnostic operation is completed, the process proceeds to step S4.
When the low-speed mode rises (UP) during the diagnostic operation, it is determined which of the upper limit car overrun detection limit switch 14 and the plunger overrun detection limit switch 11 has stopped the elevator. When the operation is stopped by the operation of the limit switch 11 for detecting the excessive passage of the plunger,
It is determined that the elongation of the main rope 9 exceeds the predetermined value, the process proceeds to step S5, and the abnormality diagnosis unit 2 outputs an alarm for the elongation of the main rope 9 to the monitoring center 3 via the telephone line. After the determination output such as storing the status data such as the date and time of detection of the abnormality in the RAM 2c or the like, the process is terminated and the process returns to the step S1 again. On the other hand, if it is determined in step S4 that the vehicle has stopped due to the operation of the upper limit car overrun detection limit switch 14, the process proceeds to step S6, where the low speed mode of the diagnostic operation is increased (U
Whether or not the limit switch 11 for overshoot detection of the plunger has been operated after the stop of P), that is, even if the limit switch 14 for overshoot detection on the top floor of the car is stopped due to the operation of the limit switch 14 for overshoot at the time of low-speed mode up (UP), Due to the inertial force of 12 or the like, the completely stopped position is slightly higher than the operating position of the top floor car overrun detection limit switch 14, and at that time the plunger overrun detection limit switch 11 operates. To determine As a result, the limit switch 11
If the operation is not performed, it is determined that the amount of extension of the main rope 9 is not abnormal, and the process is terminated and the procedure returns to the procedure 1 again. However, if it is determined in step S6 that the limit switch 11 for overshoot detection of the plunger has been operated, it is determined that the amount of expansion of the main rope 9 exceeds the predetermined value, and the flow proceeds to step S5. The same judgment output processing is performed. The MPU 2a of the abnormality diagnosing unit 2 periodically stores the RAM 2 based on a command from a monitoring center 3 at a remote place.
The detected data relating to the abnormal amount of elongation of the main rope 9 stored in c is read out, and the data is transferred to the monitoring center 3 via the telephone line (I / F) 2f via the telephone line.
The monitoring center 3 grasps the extension amount of the abnormal main ropes 9 transferred from the respective abnormality diagnosis units 2 and performs maintenance before the main ropes 9 of each hydraulic elevator are immediately before the landing level is actually disturbed. Dispatch a member to the building and
Plunger 7 and car 1
2 can have a regular relative positional relationship. Therefore, the amount of extension of the main ropes 9 can be diagnosed sufficiently in advance of a situation in which an adjustment work such as an improper landing level of an elevator is urgently required, and preventive maintenance for maintaining the building equipment in a good state can be realized. Become like In the above-described embodiment, the abnormality diagnosis section 2 and the monitoring center 3 are connected by a telephone line. However, the same can be achieved by connecting with other communication means. Although the means for detecting the excessive passage of the car on the top floor and the top floor are respectively shown by using limit switches, the present invention is not limited to this and may be used. As described above, in the abnormality diagnosis apparatus for a hydraulic elevator according to the present invention, the plunger is further raised from the top floor level to raise the car, and the operation of the top floor car overrun detection means. When the car stops at the normal position, when the plunger rises above the normal position and the plunger overshoot detecting means operates,
An extraordinary diagnosis unit is provided to judge that abnormal elongation of the main rope has occurred.Thus, it is possible to diagnose abnormal elongation of the main rope long enough before the main rope reaches the elongation that causes an improper landing level. Preventive maintenance that avoids an improper landing level due to the extension of the main rope is possible.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a hydraulic elevator abnormality diagnosis device according to an embodiment of the present invention. FIG. 2 is a flowchart showing a diagnostic operation of the hydraulic elevator abnormality diagnostic device shown in FIG. 1; [Description of Signs] 1 Elevator operation control device 1a, 2a Arithmetic processing unit 1b, 2b ROM 1c, 2c RAM 2 Abnormality diagnosis device 2f Telephone line interface 3 Monitoring center 7 Plunger 9 Main rope 10 Plunger cam 11 Plunger overshoot limit switch 12 Riding car 13 Riding car cam 14 Top-floor car over-travel detection limit switch

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yoshifumi Matsumoto 1-6-6 Kandanishikicho, Chiyoda-ku, Tokyo Inside the Hitachi Building Systems Co., Ltd. (72) Inventor Shinichiro Kawano 1-6-6 Kandanishikicho, Chiyoda-ku, Tokyo Hitachi, Ltd. Inside the building system (56) References JP-A-2-100983 (JP, A) JP-A-8-245102 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) B66B 5/12

Claims (1)

(57) [Claims 1] An abnormality diagnosis device for a hydraulic elevator which has a car that moves up and down via a main rope by a plunger and detects abnormal elongation of the main rope. a top floor cab overshoot detection means for detecting the position of the cab on the side, without positive elongation in the main rope
At all times, the above- mentioned car is raised so that the car rises above the installation position of the top-floor car over-pass detection means.
The plunger overrun detection means provided at a predetermined distance from the upper floor car overrun detection means, and the uppermost car overrun detection means operated by further raising the car above the top floor An abnormality diagnosis unit for determining that the main rope is in an abnormally stretched state when the plunger overshoot detection means operates.