JP2005350236A - Control device for hydraulic elevator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem wherein it is necessary to quickly stop an elevator car and a plunger when unusual condition occurs after the elevator car starts to lower at low speed in the case of rescuing passengers locked in the elevator car. <P>SOLUTION: In the hydraulic elevator, an emergency rescue device for controlling an emergency lowering valve for lowering the elevator car at low speed when rescuing passengers is provided in a landing of the elevator. When unusual operation occurs in the elevator car or the plunger during the low-speed lowering of the elevator car by operation of the emergency lowering valve, a pressure sensor detects unusual operation of the elevator car and the plunger, and operation of the emergency lowering valve is stopped to cope with the unusual operation. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a control apparatus for a hydraulic elevator in which hydraulic oil is supplied to a hydraulic jack by a hydraulic power unit to raise the elevator car, and the hydraulic oil is discharged from the hydraulic jack to lower the elevator car.

In the conventional hydraulic elevator, when the confinement occurs, the emergency lowering valve is manually operated to rescue the passenger. In this case, it is necessary for the rescuer to go to the machine room and operate the emergency lowering valve provided in the hydraulic power unit installed in the machine room, which impairs the speed of time to rescue. This is also the case when a hydraulic power unit is installed in the pit. In this case, workability is also a problem.
On the other hand, for example, in Patent Document 1, a rescue operation panel is installed at the elevator hall, and passengers confined in an elevator car (hereinafter referred to as “car”) can be rescued by an operation from the rescue operation panel. . In addition, the cage is lowered at a low speed after a pressure gauge is provided and it is checked whether there is any pressure abnormality.

JP 2004-1969 A

  In the conventional hydraulic elevator shown in Patent Document 1, it is possible to rescue passengers confined in the car, but an abnormal state may appear after the car starts to descend, and at that time the car is quickly stopped. It is necessary to let In particular, if the car does not descend and only the plunger is lowered, or conversely, during a low-speed operation during rescue of passengers, an operation that causes the car's lowering speed to exceed the low speed due to some failure occurs, There was a problem that this had to be dealt with quickly. The present invention has been made to solve such problems, and is intended to ensure safety by promptly responding to an abnormal operation that occurs during rescue operations.

The control device for the hydraulic elevator according to the present invention enables the determination of abnormality by detecting the pressure value of the hydraulic oil with a pressure sensor when the abnormal operation as described above occurs during low-speed driving during passenger rescue, This is a measure that immediately stops the movement when only the plunger is lowered and the movement when the car is lowered at a low speed or more.
That is, the hydraulic elevator control device according to the present invention supplies the hydraulic oil pressurized by the hydraulic power unit into the cylinder of the hydraulic jack erected in the hoistway, and the plunger is driven by the pressure of the hydraulic oil. In a hydraulic elevator that raises the car by pushing it up and lowers the car by collecting hydraulic oil from the cylinder of the hydraulic jack into the hydraulic power unit, an emergency lowering valve for lowering the car at a low speed during passenger rescue When an abnormal operation occurs in the car or the plunger during the low-speed descent of the car due to the operation of the emergency rescue device to be controlled and the emergency lowering valve, the abnormal operation of the car or the plunger is detected by the pressure sensor. A control device that deactivates the emergency lowering valve and stops the operation of the plunger. The rescue equipment are those installed in the elevator hall.

  According to the control device for a hydraulic elevator of the present invention, it is possible to quickly rescue passengers trapped in the car due to the occurrence of an earthquake, etc., and for the rescue, an abnormal state after the car starts a descent operation at a low speed If this occurs, these abnormalities can be detected by the pressure sensor, the emergency lowering valve is deactivated, the car does not descend, and only the plunger is lowered, or vice versa. When an operation that causes the lowering speed of the car to exceed a low speed due to some failure during low-speed operation, it can be dealt with immediately, so a rescue method with safety can be realized. Further, by having a minimum safe operation confirmation means, an operation means independent of a normal safety system is made possible.

Embodiments of the present invention will be described below with reference to the drawings.
In the drawings, the same reference numerals indicate the same or corresponding parts.

Embodiment 1 FIG.
FIG. 1 is a side view showing a basic configuration of a hydraulic elevator control apparatus according to Embodiment 1 of the present invention. The configuration and operation of the hydraulic elevator will be described based on FIG.

  The hydraulic elevator shown in FIG. 1 is configured as a so-called indirect hydraulic elevator, and the force of the hydraulic jack 2 erected in the hoistway 1 is applied to the car 4 via the main rope 3 (or chain). This car 4 is moved up and down in the hoistway 1 to land on the target floor. That is, the hydraulic elevator supplies hydraulic oil pressurized by the hydraulic power unit 5 into the hydraulic jack 2 cylinder via the hydraulic pipe 6, and pushes up the plunger 2a by the pressure of the hydraulic oil, thereby moving the car 4 in the hoistway. Further, by collecting the hydraulic oil from the cylinder of the hydraulic jack 2 into the oil tank of the hydraulic power unit 5 via the hydraulic pipe 6, the car 4 is lowered in the hoistway to perform normal operation.

  In the drawing, 7 is a pulley pivoted on the upper end of the plunger of the hydraulic jack 2, and 8 is a guide rail standing on the hoistway 1. The car 4 is provided with a connecting arm 9 protruding from the lower hydraulic jack 2 side. The main rope 3 has one end connected to the base of the hydraulic jack 2, wound around a pulley 7, and the other end connected to a connecting arm 9. A machine room 10 is provided adjacent to the hoistway 1. The hydraulic power unit 5 provided in the machine room 10 includes a tank (51) filled with hydraulic oil, an electric motor (52), a hydraulic pump (53) driven by the electric motor, a silencer (54), a flow rate control. There are provided a valve (55) and an emergency lowering valve (56) that can lower the car at a low speed in an emergency such as when a passenger is rescued.

  In FIG. 1, for example, in the event of a power outage or failure due to an earthquake or the like and the passenger is trapped in the car, a predetermined amount of hydraulic oil is recovered from the cylinder of the hydraulic jack 2 so that the car 4 The car is moved to the floor at low speed, and the car door and the landing door are opened to rescue passengers in the car to the landing.

FIG. 2 is a control circuit diagram of the control device that operates in such an emergency, and the operation sequence of the emergency rescue device 11 and the emergency lowering valve 56 will be described based on FIG.
The emergency rescue device 11 includes an emergency rescue switch 12 that is installed at an elevator landing and controls an emergency descent valve 56 that lowers the car 4 at a low speed in an emergency such as when a passenger is rescued via a connection 56a. . Further, the emergency rescue switch 12 includes an emergency down valve actuating relay coil 13 that actuates the emergency down valve 56 when energized, a first contact 14a of a car position detecting switch described later, and a first pressure detection. Are connected in series to form a control circuit for the emergency rescue apparatus 11. The second contact 14b of the car position detection switch and the car arrival lamp 17 are connected in parallel to this series circuit.

  The emergency rescue switch 12 is closed when the passenger is trapped in the car 4 by pressing this switch. At this time, the first contact 14a of the car position detection switch and the first pressure detection contact 15a are closed. Since each normally closed contact of the second pressure detection contact 15b is closed, the emergency lower valve actuating relay coil 13 is energized and the emergency lower valve 56 is actuated to operate the hydraulic oil in the hydraulic jack 2. Is returned to the tank 51 of the hydraulic power unit 5 to drive the car 4 at a low speed.

When the car 4 reaches the target level, that is, the installation position of the car position detection switch 14 installed in the hoistway 1 (position where the car can be decelerated from the low speed and stopped on the floor of the target floor (rescue floor)), the car position detection switch Since the normally closed contact 14a is opened, the emergency lowering valve operating relay coil 13 is extinguished, the operation of the emergency lowering valve 56 is stopped, and the car 4 is automatically stopped.
The target level is the stop operation point of the flow control valve.
When stopping manually as in the prior art, the car 4 may be lowered until it is accidentally applied to the shock absorber. In this case, the main rope 3 is loosened and it takes time to recover. Although a situation occurs, the occurrence of such a situation can be prevented.
When the first contact 14a of the car position detection switch 14 is opened, the normally-open second contact 14b that cooperates with the car contact detection switch 14 is closed, the car arrival lamp 17 is turned on, and the car 4 has arrived at the predetermined floor. Can be notified and confirmed. The car arrival lamp 17 is provided in the emergency rescue device 11.

As described in paragraph 0004, the abnormal state may occur after the car 4 starts to descend, and at that time, the car 4 and the plunger 2a need to be quickly stopped.
For this purpose, a pressure sensor 15 for detecting the pressure of the hydraulic oil is provided, and the pressure sensor 15 is provided with a normally closed contact 15a for detecting the first pressure and a normally closed contact 15b for detecting the second pressure. The pressure sensor 15 is attached immediately before the hydraulic power unit 5.

Next, an operation for dealing with this abnormal state will be described.
First, a description will be given of the case where the normally closed contact 15a for detecting the first pressure is operated when the car 4 is lowered and the car 4 is not lowered due to a sledge with the guide rail 8 or the like.
That is, the normally closed contact 15a is opened when the car 4 is not lowered and the detected pressure of the pressure sensor 15 for detecting the jack pressure becomes a certain value or less. As a result, the emergency lowering valve actuating relay coil (16) is extinguished, so that the emergency lowering valve 56 is inactivated, and the descending operation of the car 4 is stopped and the plunger 2a is also stopped.
The first pressure detection for detecting the pressure in the jack determines whether the jack pressure is only the pressure of the plunger 2a, and when the detected pressure of the pressure sensor 15 satisfies the following conditions, the normally closed contact 15a is opened.

Detected pressure of pressure sensor 15 <pressure of plunger 2a only + margin value

The margin value is a value that allows for variation in the sliding resistance of the jack packing.
If the above determination is made without taking this margin value into account, if the sliding resistance of the jack packing is changed, it may not be detected even if an abnormal state occurs. Therefore, it is determined by adding a margin value in consideration of variation in the sliding resistance of the jack packing.
Thereby, the cage | basket | car 4 does not descend | fall by the line | wire etc. with the guide rail 8, and the operation | movement which only the plunger 2a descends can be prevented.

Next, a case will be described in which the normally closed contact 15b for detecting the second pressure operates when the descending speed of the car 4 comes out at a low speed due to some failure.
That is, when the descending speed of the car 4 is over a low speed and the detected pressure of the pressure sensor 15 for detecting the jack pressure becomes a certain value or more between the pressure before and after the operation of the emergency descending valve 56, the normally closed contact 15b is opened. As a result, the emergency lowering valve actuating relay coil 13 is extinguished, the emergency lowering valve 56 is deactivated, and the descending operation of the car 4 is stopped and the plunger 2a is also stopped.

In the second pressure detection, the pressure before the operation of the emergency lowering valve 56 is memorized, and when the difference from the pressure during the operation of the emergency lowering valve 56 becomes a certain pressure or more, that is, the second pressure detection. However, when the following conditions are met, the normally closed contact 15b is opened to deactivate the emergency lowering valve.

Pressure before down valve operation-Pressure during down valve operation <Pressure loss at low speed + Margin

The pressure before the lowering valve operation is a static pressure (X) in a state where a passenger to be detected is on, the pressure during the lowering valve operation is a dynamic pressure (Y) during low-speed traveling, and a low speed The pressure loss during traveling is the pressure loss (Z) in the hydraulic pipe 6. These are in a relationship of X−Z = Y, and the above formula is obtained by adding the above margin value to this.
As a result, when the descending speed of the car 4 exceeds a low speed due to some failure, the car 4 can be stopped quickly and the operation of the car 4 and the plunger 2a can be prevented from descending.

It is a side view which shows the basic composition of the control apparatus of the hydraulic elevator in Embodiment 1 of this invention. It is a circuit diagram of the control apparatus which operate | moves at the time of the emergency of the hydraulic elevator in Embodiment 1 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hoistway 2 Hydraulic jack 2a Plunger 3 Main rope 4 Elevator car 5 Hydraulic power unit 6 Hydraulic piping 7 Pulley 8 Guide rail 9 Connecting arm 10 Machine room 11 Emergency rescue device 12 Emergency rescue switch contact 13 Emergency descent valve operation Relay coil 14 Car position detection switch 14a Car position detection switch first contact 14b Car position detection switch second contact 15 Pressure sensor 15a First pressure detection contact 15b Second pressure detection contact 17 Car arrival lamp 51 Tank 52 Motor 53 Hydraulic pump 54 Silencer 55 Flow control valve 56 Emergency lowering valve.

Claims (5)

The hydraulic oil pressurized by the hydraulic power unit is supplied into the hydraulic jack cylinder installed in the hoistway, and the hydraulic oil pressure pushes up the plunger to raise the elevator car and operates from the hydraulic jack cylinder. In a hydraulic elevator that lowers the elevator car by collecting oil in the hydraulic power unit,
An emergency rescue device that controls an emergency descent valve for lowering the elevator car at low speed during passenger rescue, and an abnormality in the elevator car or the plunger during low-speed descent of the elevator car due to the operation of the emergency descent valve When the operation occurs, a control device for detecting an abnormal operation of the elevator car or the plunger by a pressure sensor to deactivate the emergency lowering valve and stop the operation of the plunger is provided. A control device for a hydraulic elevator characterized by being installed at an elevator hall.   A car position detection switch having a first contact and a second contact linked to the first contact point is installed in the hoistway. When the elevator car reaches the installation position of the car position detection switch, the car position detection switch 2. The control device for a hydraulic elevator according to claim 1, further comprising a control device for automatically stopping the elevator car by disabling the emergency lowering valve by a first contact.   The emergency rescue device is lit by the second contact of the car position detection switch interlocked with the first contact of the car position detection switch and notifies that the elevator car has reached the installation position of the car position detection switch. 3. The hydraulic elevator control device according to claim 2, further comprising a car arrival lamp to be confirmed.   A pressure sensor for detecting the pressure of the hydraulic oil in the hydraulic jack is provided, and a contact for detecting the first pressure is provided to the pressure sensor. 2. The control device for a hydraulic elevator according to claim 1, wherein the emergency lowering valve is inactivated by the contact of the hydraulic elevator.   The pressure sensor is provided with a second pressure detection contact, the hydraulic oil pressure before the operation of the emergency down valve is stored, and the difference between the hydraulic oil pressure during the operation of the emergency down valve is equal to or greater than a certain pressure. 2. The hydraulic elevator control device according to claim 1, wherein the emergency lowering valve is deactivated by the contact point of the second pressure detection when the second pressure detection is performed.

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