JPH0643238B2 - Control device for hydraulic elevator - Google Patents

Description

Description: [Industrial field of application] The present invention relates to an improvement in a driving device for a hydraulic elevator.

[Prior Art] Generally, in a hydraulic elevator, in consideration of an accident, for example, when the amount of oil during the ascending operation becomes small and the car cannot be raised,
Also, when the starter contactor is stuck or welded, the electric motor continues to rotate, so the increase in oil temperature, the burnout of the electric motor, etc. should be considered.
A slip prevention circuit is legally required.

The operation of the idling prevention circuit in the conventional hydraulic elevator control device is generally performed by cutting off the power supply in consideration of the above case as shown in Japanese Patent Publication No. 58-18309. In this case, the passengers of the elevator are put in a state of being confined in the car room, and therefore a method of rescuing the passengers has been proposed.

In the above-mentioned publicly known example, when the vehicle is in the door zone, the door is opened and then the power is cut off to rescue the passenger and prevent the vehicle from being trapped in the car room.

[Problems to be Solved by the Invention] Since the above-described conventional hydraulic elevator control device is configured as described above, it is possible to rescue passengers when in the door zone, but a slip prevention device is provided outside the door zone. There was a problem that passengers could be trapped inside the car when he worked.

The present invention has been made to solve the above-mentioned problems, and even if the idling detection device operates outside the door zone, the power is not cut off immediately, and it is possible to prevent passengers from being trapped in the cab. It is an object of the present invention to provide a control device of.

[Means for Solving Problems] A control device for a hydraulic elevator according to the present invention is provided with a first idling detection means and a second idling detection means having different time periods for detecting idling, and first idling detection is performed. When the means operates, the operation control circuit is cut off, and the idling state continues and the second
The idling detection means is operated to operate the power breaker.

[Operation] In the hydraulic elevator control device according to the present invention, the operation control circuit is cut off by the first idling detection means, and, for example, the oil amount is insufficient,
It prevents passengers from being trapped inside the cab when the car cannot move up due to other reasons such as contact with a car.On the other hand, in case of welding of the start contactor, the motor cannot be stopped. Operate the vessel.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a circuit configuration diagram of a hydraulic elevator control device according to the present embodiment. In the figure, R, S, T are AC power supplies, (1)
Is a power circuit breaker, (1a) is a trip coil for the electric circuit breaker (1), (2) is a hydraulic pump motor, and (3) is a door zone detection that closes when the car is in the door zone. The relay contacts, (4a) to (4d), are closed when the rising relay (12) described later is energized, open after a certain time when deenergized, and open when the slip prevention device operates. Electromagnetic contactor contact, (5) rectifier, (6) well-known direction determining circuit, (7) up-run command relay, (7a) normally open contact, (7b) normally closed contact, (8) is also a down operation command relay, (8a) is its normally open contact, (8b) is also a normally closed contact, (9) is a door closing detection relay contact that closes when the car door is closed, (10) The car is closed while the car is stopped and rising, and it opens when the car approaches the floor to be stopped. (11) is the same as the down detection relay contact. (12) is biased by the lifting relay for energizing an electromagnetic contactor for the motor drive, the normally open contact of (12a) is the lifting relay (12), (12
b) is also a normally closed contact, (13) is a descending relay that operates a flow rate control device (not shown) when it is energized to discharge the hydraulic pressure from the hydraulic jack to descend the car, and (13a) is the descending relay. (13) normally open contact, (13b) the same normally closed contact, (1
4) and 16), when the electromagnetic contactor contact (4d) for driving the electric motor is closed, it conducts after a fixed time to excite the first and second idling detection relays (15) or (17), A timed circuit that becomes non-conductive when the drive contactor contact (4d) is opened, (15a)
Is a normally open contact of the first idle detection relay (15), (15b) is a normally closed contact, (17a) is a normally open contact of the second idle detection relay (17), and (17b) and (17c) are Similarly, the normally closed contact (18) is an inter-story idling detection relay that, when energized, blocks the upward operation command and holds it by the self-normally open contact (18a) when it is outside the door zone. When the inter-floor slip detection relay (18) is energized, the high-speed operation circuit is disconnected and the low-speed operation is started.

Next, the operation of this embodiment will be described.

Now, it is assumed that the power breaker (1) is turned on and the car is stopped. If the direction determining circuit (6) determines that the vehicle is going up, the circuit (5)-(6)-(18b)-(8b)-(7)-(5) will turn on the up operation command relay (7). Energized, normally open contact (7a)
Is closed and the normally closed contact (7b) is opened. When the car door is closed, the door close detection relay contact (9) is closed. The up stop detection relay contact (10) is closed. Now, (5)-
The rising relay (12) is energized by the circuit of (9)-(7a)-(10)-(15b)-(13b)-(17b)-(12)-(5) and the normally open contact (12a Self-hold by closing). Then, since the electric motor driving electromagnetic contactor contacts (4a) to (4c) are closed, the hydraulic pump electric motor (2) is rotated. At the same time a flow controller (not shown)
Works. As a result, the hydraulic pump (not shown) is driven, the hydraulic pressure is sent to the hydraulic jack (not shown), and the car starts to rise. Further, the time limit circuits (14) and (16) start time counting by closing the electromagnetic contactor contact (4d).
When the car approaches the floor to be stopped, the up-stop detection relay contact (10) is opened, the up relay (12) is deactivated, and the flow controller (not shown) operates to stop the car. Then, after a certain period of time, the electromagnetic contactor contacts (4a) to (4c) are opened and the electric motor (2) is stopped. At this time, since the time limit circuit (14) has a time longer than the time required to normally run from the lowest floor to the highest floor, the time limit circuits (14) and (16) do not conduct and the slip prevention relay
(3) does not work.

The time limit of the time limit circuit (16) is set by adding a certain fixed time to the time limit of the time limit circuit (14).

In the case of the down operation, the down operation command relay (8) is energized, and the down relay (13) is energized by closing the normally open contact (8a). As a result, the flow control device operates and the car descends. Stopping at each floor is the same as in the case of uphill driving.

Next, the electric motor (2)
When the idle circuit of (14) occurs and the time circuit (14) becomes conductive while the car is traveling, the first idle detection relay (15) is energized and the normally closed contact (1
5b) is opened and the rising relay (12) is de-energized, the magnetic contactor contacts (4a) to (4d) are opened and the electric motor (2) is stopped. Also, by closing the normally open contact (15a), the inter-storey slip detection relay (18) is energized, the contact (18b) is opened, and the operation command relay (7) is demagnetized by the up operation command.

On the other hand, the door zone detection relay contact (3) is closed, so the inter-story slip detection relay (18) is self-holding in the circuit of (5)-(18a)-(3)-(18)-(5). To do. Also, the time contact (18c) is closed for a predetermined time after the inter-level slip detection relay (18) is energized, so the down operation command relay (8) is energized and the descending relay (13) is energized. As a result, the vehicle will descend at a low speed. Contact of the above electromagnetic contactor
By opening (4d), the time limit circuits (14) and (16) cancel the count, and the first idling detection relay (15) is demagnetized.

The descent operation continues while the inter-story slip detection relay (18) is energized, and when the door zone on the lowermost floor is detected, the inter-door zone detection relay contact (3) is opened. (18) is deactivated, so the car will drive to the nearest lower floor.

In this way, in the case of idling due to insufficient oil amount, etc., demagnetizing the rising relay by the first idling detection relay (15) will also open the electromagnetic contactor contact (4d) and stop the electric motor (2), so descending operation It is possible, and passengers can be rescued by descending as described above.

Next, a case where the electromagnetic contactors (4a) to (4c) for driving the electric motor are welded will be described. In this case, the magnetic contactor contact (4
Since d) is closed, the time circuit (14)
When the current is conducted, the up operation command relay (12) and the up relay (12) are demagnetized as before, but the electromagnetic contactor contacts (4a) ~
Since (4d) remains closed, the electric motor (2) continues to idle, the time limit circuit (16) becomes conductive at a predetermined time after the time limit circuit (14) becomes conductive, and the second idle detection relay (17) becomes Be energized. This closes the contact (17a), energizes the trip coil (1a), activates the power breaker (1), disconnects the motor (2) from the power supply, and this motor (2) must be stopped. Also stop. In addition, all circuits below the rectifier (5) are also disconnected.

In this case, it is the power breaker (1) that the relays (12) and (13) for ascending and descending are also disconnected by opening the contacts (17b) and (17c) of the operation command relay (7). This is to make it impossible to operate considering the failure of.

When the contact for the electromagnetic contactor is welded, the rotation of the electric motor (2) cannot be stopped even by the operation of the first slip detection relay (15), so even if a descending operation command is issued, oil will be discharged from the tank via the pump. Because the car is supplied, the car cannot run and is meaningless.

In the above embodiment, the first slip detection relay (15) is not held by the count reset of the time circuit (14).
Alternatively, the time limit circuit (14) may retain the count without resetting. In this case, the ascending operation is blocked by opening the contacts (15b) and (18b), so only the descending operation is possible, and at the end it becomes impossible to operate at the bottom floor, and an abnormality can be detected early.

Further, the idling detection is indirectly performed by the electromagnetic contactor contact, but the same effect can be obtained by directly detecting the rotation of the electric motor.

[Advantages of the Invention] The present invention relates to a hydraulic elevator control device for controlling an elevator that raises and lowers a car via hydraulic pressure, and a rotation detection means for detecting rotation of an electric motor during a car ascending operation, and this rotation detection means are predetermined. First idle detection means for emitting a first signal when operated for a time, and second idle detection means for emitting a second signal when the rotation detection means operates for a predetermined time longer than the time limit of the first idle detection means, The first signal of the first slip detection means issues a command to shut off the elevator operation control circuit to stop the car and the motor, and after this command, issues a low speed descent operation command to the elevator, and the second signal.
The idle rotation detection time control means for issuing a command to shut off the power supply of the elevator by the second signal of the idle rotation detection means.

Accordingly, when the cause of idling is insufficient oil, it is possible to prevent the problem that the first idling detection means lowers the car to trap passengers in the car. Also,
When the cause of idling is welding of the start-up contactor or the like and the car cannot be lowered, there is an effect of shutting off the power supply of the elevator and improving safety.

[Brief description of drawings]

FIG. 1 is a circuit configuration diagram of a hydraulic elevator control device according to an embodiment of the present invention. (1) ...... Power breaker, (1a) ...... Power breaker trip coil, (4a) ~ (4d) ...... Magnetic contactor contact for driving motor, (5) ...... Rectifier, (6) ...... … Direction determining circuit, (7) ……
Upward operation command relay, (14), (16) …… Timed circuit, (15)…
… First slip detection relay, (17) …… Second slip detection relay, (18) …… Inter-story slip detection relay.

Claims (1)

[Claims] 1. A hydraulic elevator control device for controlling an elevator that raises and lowers a car via hydraulic pressure, wherein a rotation detecting means for detecting rotation of an electric motor during the ascending operation of the car, and the rotation detecting means operates for a predetermined time. Then, a first idling detecting means for emitting a first signal, and a second idling detecting means for emitting a second signal when the rotation detecting means operates for a predetermined time longer than the time limit of the first idling detecting means, A first signal of the first slipping detection means issues a command to shut off the operation control circuit of the elevator to stop the car and the electric motor, and after this command, issues a low speed descent operation command to the elevator, and A hydraulic elevator, comprising: idling detection time control means for issuing a command to shut off the power supply of the elevator in response to a second signal of the second idling detection means. The control device.