JP2799163B2 - Abnormal sign diagnosis device for hydraulic elevator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of an abnormality sign diagnosis apparatus for diagnosing a sign of an abnormal operation of a hydraulic elevator in which a car directly or indirectly locked to a telescopic hydraulic cylinder moves up and down.

[0002]

2. Description of the Related Art As is well known, a hydraulic elevator is configured to guide an elevator by guiding pressure oil discharged from a hydraulic pump to a hydraulic cylinder directly connected to a car or engaged via a rope connected to the car. On the other hand, the pressure oil in the hydraulic cylinder is lowered by being returned to the oil tank while being raised. The control of raising and lowering the elevator is performed by a hydraulic control circuit provided between the hydraulic cylinder and the hydraulic pump and the oil tank. The hydraulic control circuit includes a control valve for ascending operation, a control valve for descending operation, a safety valve for protecting the hydraulic circuit from abnormal high pressure, and the like.

[0003] When an abnormality occurs in the control valve or the safety valve, other hydraulic circuit elements are adversely affected, or the traveling of the elevator becomes unstable, giving a passenger discomfort. Also, if the abnormal state continues or worsens,
There is also a risk of damaging the elevator equipment.

In order to prevent damage to equipment and harm to passengers caused by abnormal rise of pressure oil for driving a hydraulic elevator, for example, Japanese Patent Application Laid-Open No. 61-169473 discloses a hydraulic control circuit. A hydraulic elevator provided with a hydraulic pressure detector, and when the hydraulic pressure detected by the hydraulic pressure detector is abnormally high, the car is guided to land on the nearest floor, and then the operation of the elevator is stopped. Japanese Patent Laid-Open Publication No. Sho 61-235380 discloses a safety control device which is provided with a pipe line during a normal raising operation of a car or an oil temperature raising operation for raising the oil temperature when the temperature of hydraulic oil is too low. There is disclosed an invention of a safety device for a hydraulic elevator which detects a change in internal pressure and shuts off a main power supply circuit when the pressure change amount exceeds a predetermined range.

[0005]

According to the above-mentioned prior art, the hydraulic pressure in the working hydraulic circuit actually becomes an abnormally high value or the pressure change amount exceeds a predetermined range. When an elevator occurs, the elevator stops operation immediately, so passenger safety can be ensured. However, the elevator will be in a non-operational state, especially in a building with only one elevator during busy hours. When the operation is stopped, the user is greatly inconvenienced.

SUMMARY OF THE INVENTION The present invention solves such a problem in the prior art, and provides an early warning of an abnormality which may occur in a hydraulic control circuit system before an abnormality occurs in a hydraulic circuit in which an elevator is inoperative. It is an object of the present invention to provide an abnormality predictive diagnosis device for a hydraulic elevator capable of performing preventive maintenance by detecting the abnormality.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is directed to a hydraulic pump, which is connected between a hydraulic pump and a hydraulic cylinder and an oil tank for storing hydraulic oil, and in which hydraulic oil flows into the hydraulic cylinder. And a line in a hydraulic control circuit that controls the operation of the hydraulic elevator by controlling the outflow, preferably in a hydraulic circuit in a line that flows into or out of the hydraulic cylinder. To calculate the differential pressure between the two and calculate the product of the oil pressure in the pipeline immediately before the car travels and a predetermined coefficient to obtain an allowable value, and compare the differential pressure with the allowable value. If the differential pressure is equal to or larger than the allowable value, the hydraulic control circuit determines that there is a sign of an abnormal operation.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A hydraulic elevator according to the present invention typically controls the power of AC power supplied from a commercial three-phase AC power supply by an inverter to control the rotation speed of an AC motor connected to the inverter. Although the present invention is applied to the system, the present invention is not limited to this system, and can also be applied to a system driven by a motor that rotates at a constant speed. The elevator drive system can be applied to either a direct drive system in which the car is moved up and down directly by a hydraulic cylinder or an indirect drive system in which the car is moved up and down indirectly via a rope or the like. The main circuit element of the hydraulic control circuit can be typically one using a check valve with a throttle, but can also be applied to one using another control valve. The main part of the abnormality sign diagnosing device can be easily configured by using a known microcomputer.

[0009]

An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a block diagram of a hydraulic control circuit of a hydraulic elevator according to an embodiment of the present invention. In the figure, 1 is a hydraulic elevator operation control device, 2 is an abnormality diagnosis device, 3 is a monitoring center that is connected to the abnormality diagnosis device 2 via a telephone line, and monitors the operation state of the hydraulic elevator, 4 is A commercial three-phase AC power supply, 5 is an inverter control unit for controlling the number of revolutions of an AC motor described later, 6 is an AC motor that rotates by being driven by power from the three-phase AC power supply 4, and 7 is an AC motor 6 not shown. A hydraulic pump, which is connected via a coupler and is driven and rotated to supply or discharge hydraulic oil to or from the hydraulic circuit, is an oil tank 8 for storing hydraulic oil.

Further, among the components of the hydraulic circuit, 10 is a check valve with a throttle for stopping or controlling the lowering of the car, and 11 is a negative pressure in the hydraulic control circuit during the lowering operation or the like. The suction valve 12 sucks the hydraulic oil in the oil tank 8 to prevent damage to the equipment, and the hydraulic valve in the hydraulic control circuit 12 when the pressure in the hydraulic control circuit becomes excessively high, such as during ascent operation. A safety valve 13 is provided in the pipeline at the discharge position of the hydraulic pump 7 to prevent the device from being damaged by being discharged into the pump 8. A pump pressure sensor for detecting the discharge pressure of the hydraulic pump 7 is provided. A cylinder pressure sensor 16 is provided in the oil feed pipe T on the inlet or outlet side of the hydraulic oil and detects the pressure of the hydraulic oil acting on the inner wall of the cylinder. To be derived Is a cylinder that expands and contracts Ri.

In the components of the drive system of the hydraulic elevator, reference numeral 17 denotes an operating rod which moves in the vertical direction by expansion and contraction of a cylinder 16, reference numeral 18 denotes a pulley rotatably attached to the tip of the operating rod 17, and reference numeral 19 denotes one end. Cylinder 16
A main rope fixed to the bottom of the car, the other end of which is fixed to the car, and which is bridged over the pulley 18, 20 is a car, 21 is a pair of driven followers rotatably attached to upper and lower ends of a traveling path of the car 20. A speed-controlling rope that can be wound around a pulley and partially fixed to the car 20. A speed-control rope 22 is connected to the AC motor 6 to detect the rotation speed and convert the rotation speed data into rotation speed data. Rotary encoder (R
E) and 23 are car rotary encoders (RE) which are connected to the one driven pulley and detect the number of rotations and convert the rotations into rotation number data corresponding to the traveling speed data of the car.

In the internal configuration of the operation control device 1 and the abnormality diagnosis device 2, reference numeral 1a denotes an arithmetic processing unit (MPU) for executing operations in accordance with a control program based on various data and control device signals to control the operation of the hydraulic elevator; 1b is a read-only storage element (ROM) for storing a control program for the hydraulic elevator, 1c is a rewritable storage element (RAM) for storing control data for the hydraulic elevator, and 1d is for signal transmission in the operation control device 1. The bus 1e is an input / output device (I / I) for inputting and outputting signals to and from controlled equipment.
O).

Reference numeral 2a denotes an arithmetic processing unit (MPU) for executing an operation in accordance with the abnormality diagnosis program to diagnose an abnormality of the hydraulic control circuit; 2b, a read-only storage element (ROM) for storing the abnormality diagnosis program; A rewritable storage element (RAM) for storing an initial value for diagnosis, a reference value for abnormality determination, and data of an abnormality diagnosis result, a bus 2d for signal transmission of the abnormality diagnosis device 2, and a 2e MPU 1a
The read / write simultaneous memory element (DPRAM) 2f which takes out the signal of the operation control device 1 and outputs it on the bus line of the bus 1d via the bus 2d and stores it, transmits and receives data to and from the monitoring center 3. This is a telephone line interface (telephone line I / F) that controls connection to a telephone line to perform the connection. The operation of the check valve 10 with the throttle is opened when the pump pressure becomes larger than the cylinder pressure during the ascending operation, and is switched to the right spool position in the drawing by driving the solenoid during the descending operation, and is opened with the throttle.

Next, the operation of this embodiment will be described. FIG. 2 is a time lapse diagram showing a comparison between the traveling speed of the car and the cylinder pressure when the elevator travels upward in response to the hall call, and FIG. 3 is a flowchart of the abnormality predictive diagnosis operation of the hydraulic control circuit. In FIG. 2, (a) is the traveling speed of the car,
(B) shows the cylinder pressure at the time of normal operation, (c) shows the cylinder pressure at the time of operation with a sign of abnormality, and (d) shows the door opening / closing operation state by a hall call at the same time. . Hereinafter, the abnormality sign diagnosis operation of the present embodiment will be described with reference to these drawings. First,
In step S1 of FIG. 3, the MPU 2a of the abnormality diagnosis device 2 determines whether or not the elevator is running, that is, the time t in FIG.
It is determined whether it is later. If the result of the determination is no, that is, if the elevator is stopped and t ≦ t2, the process proceeds to step S2 to determine whether or not the door opening / closing operation is being performed by a hall call.
That is, it is determined whether or not the time t is after t0 and before t2 in FIG. If the determination result is true, that is, if t0 ≦ t ≦ t2, the process proceeds to step S3, where the value of the cylinder pressure P2 before the elevator travels is set as the cylinder pressure initial value, and the register R1 in the RAM 2c of the abnormality diagnosis device 2 is set as the cylinder pressure P2. To memorize. If the result of the determination in the step S2 is negative, that is, if t <t0 or the processing in the step S3 is completed, the process returns to the first step S1.

If the result of the determination in step S1 is true, that is, if the elevator is running and time t is later than t2, it is determined whether the elevator is running at rated speed, ie, whether time t is later than t3. (S4). If the result of the determination is no, that is, if the elevator is accelerating and the time t is later than t2 and before t3 (t2 ≦ t ≦ t3), the process returns to the first step S1, and
The result of the determination in step S4 is the same, that is, after the elevator accelerates, the time t is later than t3 during the rated traveling (t3 <
If t), the value of the cylinder pressure P3 at that time is stored in the register R2 in the RAM 2c as a cylinder pressure reference value (S5). Then, the register R is read from the RAM 2c.
2, the cylinder pressure P3 stored in R1, respectively.
The data of P2 is read and their difference (R2-R1)
Is calculated, and the cylinder pressure P during the rated travel of the elevator
3 and the pressure difference ΔP between the cylinder pressure P2 immediately before traveling = (P3-
P2) is obtained and stored in the register R3 in the RAM 2c (S6).

Next, an operation of multiplying the value of the cylinder pressure P1 stored in the register R1 by a preset coefficient α is performed to obtain an allowable value L, and the data of the allowable value L is stored in the RAM2.
The data is stored in the register R4 in (c) (S7). And
The data of the differential pressure ΔP and the allowable value L stored in the registers R3 and R4 are read from the RAM 2c, and it is determined whether R3 <R4 (S8). If the determination result is true, that is, if R3 <R4 and the differential pressure ΔP is smaller than the allowable value L, it is determined that there is no sign of abnormality in the hydraulic control circuit of the hydraulic elevator (S9). On the other hand, procedure S
8 is negative, that is, R3 ≧ R4 and the differential pressure ΔP
Is greater than or equal to the allowable value L, it is determined that there is a sign of abnormality in the hydraulic control circuit of the hydraulic elevator (S10). Then, the data of the occurrence state of the sign of the abnormality is
It is stored in the AM 2c (S11). It should be noted that the data on the occurrence status of the sign of the abnormality include the date and time when the sign of the abnormality appears, the traveling position of the car 20, the cylinder pressures P2 and P3 before and after traveling at the rated speed, and not shown in the operation control device 1. This is data on the input and release status of each electromagnetic contactor.

The MPU 2a of the abnormality diagnosing device 2 periodically executes the RAM 2 based on a command from the remote monitoring center 3.
The data of the status of the occurrence of the abnormality stored in c is read out, and the telephone line I / F 2f transfers the data to the monitoring center 3 via the telephone line. The monitoring center 3 grasps the data of the sign of the abnormality transferred from each abnormality diagnostic device 2 and dispatches a maintenance worker to the building before the abnormality actually occurs in the hydraulic control circuit of each hydraulic elevator. Preventive maintenance that keeps building equipment in good condition without causing anomalies such as disturbing customers due to an emergency stop of the elevator, because it is possible to investigate the cause of signs of abnormality in detail and take measures. Can be realized.

Although the present embodiment has been described with reference to the case where the diagnosis of an abnormality of the hydraulic control circuit is performed at the time of ascending operation of the hydraulic elevator, the case of performing the diagnosis of an abnormality at the time of descending operation can be similarly performed. For example, a sign of an abnormality such as an excessively large throttle abnormality of the check valve with throttle 10 can be detected. In addition, when a sign of abnormality appears in the hydraulic control circuit, the ratio is often reflected in the ratio of the pressure difference ΔP between the cylinder pressure P3 during the rated traveling and the cylinder pressure P2 immediately before the traveling to the cylinder pressure P2. The sign of the abnormality of the control circuit can be detected by the abnormality diagnosis according to the present embodiment. Further, in this embodiment, the sign of the abnormality of the hydraulic control circuit is determined based on the value of the cylinder pressure detected by the cylinder pressure sensor 14. However, the hydraulic pressure in the pipeline in the hydraulic control circuit during the rated traveling is determined by the cylinder pressure. Instead of the pressure, the determination can be made based on the value of the pump pressure during rated traveling detected by the pump pressure sensor 13. In this case, the hydraulic pressure in the pipeline in the hydraulic control circuit for calculating the differential pressure from the pump pressure and calculating the allowable value to be determined is the cylinder pressure.

[0019]

As described above, according to the first aspect of the present invention, the hydraulic pressure in the pipeline in the hydraulic control circuit is detected immediately before the car travels and during the rated travel, and the pressure difference between the two is detected. The oil pressure control circuit calculates the allowable value by calculating the product of the oil pressure in the pipe line and a predetermined coefficient immediately before the car travels, and if the differential pressure is equal to or more than the allowable value, the hydraulic control circuit indicates a sign of abnormal operation. Before the occurrence of an abnormality in the hydraulic circuit that would cause the elevator to go into a non-operational state, a sign of an abnormality that could occur in the hydraulic control circuit system was detected early and countermeasures were taken. By taking such a measure, it is possible to perform preventive maintenance for preventing an elevator from being in an inoperative state due to occurrence of an abnormality and causing trouble to customers. According to the second aspect of the present invention, the hydraulic pressure in the pipeline in the hydraulic control circuit, which is detected for calculating the differential pressure, is equal to the hydraulic pressure of the hydraulic cylinder in which the car is directly or indirectly locked. Since the oil pressure in the pipeline near the outflow and inlet ports is used, it is possible to reliably detect any signs of operation abnormality in the hydraulic control circuit connected between the hydraulic pump and hydraulic cylinder and the oil tank for storing hydraulic oil. be able to.

According to the third aspect of the present invention, the hydraulic pressure in the pipeline in the hydraulic control circuit, which is detected for calculating the differential pressure, is the hydraulic pressure in the pipeline near the outflow / inflow port of the hydraulic oil of the hydraulic cylinder. When the car is running at rated speed, the oil pressure in the pipeline near the discharge port of the hydraulic oil of the hydraulic pump was taken as the oil pressure in the pipeline near the outlet of the hydraulic cylinder. It is possible to obtain the same abnormality detection effect as in the case where the hydraulic pressure is within. According to the fourth aspect of the invention, the hydraulic pressure in the pipeline in the hydraulic control circuit immediately before the car travels is such that after the door is opened in response to the hall call and the hydraulic elevator after the door is closed is stopped. By detecting the door open / close signal, the detection timing of the hydraulic pressure in the pipeline in the hydraulic control circuit immediately before the car travels can be easily grasped.

[Brief description of the drawings]

FIG. 1 is a block diagram of a hydraulic control circuit of a hydraulic elevator according to an embodiment of the present invention.

FIG. 2 is a time lapse diagram showing a traveling speed of an ascending hydraulic elevator and a cylinder pressure in comparison.

FIG. 3 is a flowchart of an abnormality sign diagnosis operation of the hydraulic control circuit;

[Explanation of symbols]

 Reference Signs List 1 operation control device 1a, 2a arithmetic processing unit (MPU) 1b, 2b ROM 1c, 2c RAM 1d, 2d bus 2 abnormality diagnosis device 2f telephone line interface (telephone line I / F) 3 monitoring center 6 AC motor 7 hydraulic pump 8 Oil tank 10 Check valve with throttle 13 Pump pressure sensor 14 Cylinder pressure sensor 16 Cylinder 18 Pulley 19 Main rope 20 Basket 21 Governing rope 23 Rotary encoder for cage (RE)

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-3-192079 (JP, A) JP-A-3-124678 (JP, A) (58) Fields investigated (Int.Cl. ⁶ , DB name) B66B 9/04 B66B 1/26 B66B 5/00 B66B 5/02

Claims (4)

(57) [Claims] A car which is directly or indirectly locked via a rope or the like to a hydraulic cylinder which expands and contracts by the inflow of discharge oil from a hydraulic pump and a load pressure acting on an operating rod, causes the hydraulic cylinder to expand and contract. A diagnostic apparatus for predicting abnormality of a hydraulic elevator which diagnoses a sign of an abnormal operation of a hydraulic elevator moving up and down by the hydraulic pump, wherein the hydraulic pump is connected between the hydraulic pump and the hydraulic cylinder and an oil tank for storing hydraulic oil; The hydraulic pressure in the pipeline in the hydraulic control circuit that controls the operation of the hydraulic elevator by controlling the inflow and outflow of hydraulic oil to and from the cylinder is detected immediately before the car travels and during the rated travel, and the differential pressure between the two is detected. Calculating the product of the hydraulic pressure in the pipeline immediately before the car travels and a predetermined coefficient to obtain an allowable value, and calculating the differential pressure and the allowable value. In comparison, if the differential pressure is equal to or greater than the allowable value, the hydraulic control circuit determines that there is a sign of an operation abnormality, and the abnormality predicting diagnosis apparatus for the hydraulic elevator is characterized by the above-mentioned. 2. The hydraulic pressure in a pipeline in the hydraulic control circuit, which is detected for calculating the differential pressure, is equal to the pressure oil of the hydraulic cylinder to which the car is directly or indirectly locked via a rope or the like. 2. The abnormality predictive diagnosis device for a hydraulic elevator according to claim 1, wherein the hydraulic pressure is a hydraulic pressure in a pipeline near the outlet. 3. The hydraulic pressure in the pipeline in the hydraulic control circuit, which is detected to calculate the differential pressure, is directly related to the one immediately before the car travels, or indirectly controlled by a rope or the like. The hydraulic pressure in the pipeline near the outflow / inlet port of the hydraulic oil of the stopped hydraulic cylinder is set as the hydraulic pressure in the pipeline near the discharge port of the hydraulic oil of the hydraulic pump when the car is running at rated speed. The abnormality predictive diagnosis device for a hydraulic elevator according to claim 1. 4. The hydraulic pressure in the pipeline in the hydraulic control circuit immediately before the car travels is determined by the hydraulic pressure in the pipeline when the hydraulic elevator is stopped after the door is opened and closed after the door is opened in response to the hall call. 2. The abnormality predictive diagnosis device for a hydraulic elevator according to claim 1, wherein the hydraulic pressure is a hydraulic pressure.