JPS6320753B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control device for a hydraulic elevator, and particularly to a control device that is improved in controlling an electric motor that drives a hydraulic pump.

Conventionally, a hydraulic elevator has a cylinder for moving a car, a hydraulic pump that sends pressure oil to the cylinder via a lifting solenoid valve, and an electric motor that drives this pump, and drives the electric motor during lifting operation. At the same time, the lift solenoid valve is opened to send pressure oil to the cylinder, and when the lift solenoid valve is stopped, the lift solenoid valve is closed to cut off the oil supply to the cylinder, and the motor is disconnected from the power source to stop its rotation. There are known devices that stop hydraulic pumps by stopping them. In such a hydraulic elevator, if the power to the ascending solenoid valve and the electric motor are shut off at the same time when the elevator is stopped, the shock of the elevator car becomes large and the ride quality deteriorates. For this reason, after a certain period of time, such as 2 seconds, after the power to the lift solenoid valve is cut off, the power to the motor is cut off to stop it.

However, during the ascending operation, the ascending solenoid valve malfunctioned.
If the lift solenoid valve remains open even after the power is shut off, there is a risk that the car will not stop even when it reaches the stop position, but will rise further and end up outside the door zone. Generally, if an elevator door is open outside the door zone, it will detect an abnormality and stop operation and close the door to ensure safety, and if the door is closed, it can respond to calls even from outside the door zone. It is configured as follows. However, if the above-mentioned failure occurs on the top floor, the plunger of the cylinder will rise excessively. In other words, if it travels too far, it may collide with a stopper in the cylinder, giving a large shock to the elevator and possibly causing damage to the equipment. In addition, to prevent this, there is a circuit that stops the movement of the car before the plunger hits the stopper in the cylinder, but if this activates, it will cause an emergency stop and passengers will be trapped inside the car. There was a problem.

The present invention is an attempt to solve the above-mentioned problem, and includes a device for detecting when the car has risen above its normal stopping position at the top floor. When the car rises too far above its normal stop position, the rotation of the electric motor of the hydraulic pump is immediately stopped, making it possible to prevent the car from overshooting even in the event of a failure of the solenoid valve for lifting, thereby preventing passengers from being trapped inside the car. The object of the present invention is to provide a control device for a hydraulic elevator that can prevent the equipment from being damaged.

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

In FIG. 1, 1 is a hoistway of a hydraulic elevator, 2 is a cylinder installed at the bottom of the hoistway 1 and filled with oil 3, 4 is a plunger inserted into the cylinder 2, and 5 is the head of the plunger 4. 5a is the floor of the car which is coupled to the car and moves up and down in the hoistway 1. 6
An overclimb detection switch 7 provided on the ladder 5 is a cam that is disposed above the top floor landing 10 in the hoistway 1 and engages with the overclimb detection switch 6.
These constitute a device that detects when the car has risen above its normal stopping position at the top floor. 8 is a position switch disposed near the top floor landing 10 in the hoistway 1 to detect the top floor position of the car; 9 is a cam provided on the car 5 and engaged with the top floor position switch 8; These constitute a device that detects that the car is on the top floor. 11 is a pipe connected to the cylinder 2; 12 is a rising electromagnetic valve connected to the pipe 11 and sends pressure oil to the pipe 11 when opened; and 13 is a rising solenoid valve provided in the pipe 11 to discharge oil from it. Lowering solenoid valve, 1
4 is a hydraulic pump whose discharge side is connected to the ascending solenoid valve 12; 15 is an electric motor connected to the hydraulic pump 14 to drive it; 16 is the suction side of the hydraulic pump 14 and the oil return side of the descending solenoid valve 13; It is a connected oil tank.

In FIG. 2 showing the electric circuit of this embodiment, + and - are DC power supplies, and 17a and 17b are normally open contacts of upward travel relays (not shown), which are provided in parallel. 18 is a control circuit for the ascending solenoid valve 12 connected in series with the normally open contact 17a; 19;
19a is a normally open time contact that closes immediately when the motor control relay 19 is energized and opens after a certain period of time when the motor control relay 19 is deenergized. 19a is provided in parallel with normally open contacts 17a and 17b. Reference numeral 20 denotes a motor control circuit that drives the motor 15, and this control circuit 20 controls the normally open time limit via the signal contact 6a of the overrise detection switch 6 and the signal contact 8a of the top floor position switch 8, which are provided in parallel with each other. It is connected in series to the contact 19a.

Next, the operation of the control device of the embodiment configured as above will be explained.

If car 5 is stopped on a floor other than the top floor such as an intermediate floor and there is a call to the top floor, after the door is closed,
The upward travel relay (not shown) is energized,
Since the normally open contacts 17a and 17b are closed, the motor control relay 19 is energized by the circuit of power supply +-normally open contact 17b-motor control relay 19-power supply-. For this reason, the power supply +- normally open time contact 19a-
The motor control circuit 20 is operated by the signal contact 8a-motor control circuit 20-power supply circuit, the electric motor 15 rotates, and the hydraulic pump 14 is driven, so that pressurized oil is supplied from the tank 16, and Power supply + - normally open contact 17a - control circuit 18 of rising solenoid valve 12 - power supply - circuit, the control circuit 18 operates and the rising solenoid valve 12 opens, so that pressure oil passes through the pipe line 11 and flows into the cylinder 2. The car 5 is sent up, and the car 5 rises. When the car 5 approaches the top floor, the cam 9 engages the top floor position switch 8, which operates the switch 8 and opens and closes its signal contact 8a. When the car 5 further rises and reaches the top floor stop position, the ascending travel relay (not shown) is demagnetized and the normally open contact 17a opens, so the ascending solenoid valve 12 closes and pressurized oil is routed through the pipe. Car 5 stops because it is no longer sent to car 11. Furthermore, the motor control relay 19 is demagnetized by opening the normally open contact 17b;
The normally open time contact 19a is further closed for a certain period of time, and when the normally open time contact 19a opens after a certain period of time has elapsed, the electric motor 15 stops rotating, the hydraulic pump 14 also stops, and the operation is completed. Become.

At this time, if the lifting solenoid valve 12 fails and does not close, the electric motor 15 is rotating, so pressure oil is sent from the tank 16 to the cylinder 2 by the hydraulic pump 14, and the car 5 further rises. When the car 5 goes beyond the normal landing zone on the top floor, the over-rise detection switch 6 engages with the cam 7 and operates, the signal contact 6a is opened and the motor control circuit 20 becomes inoperable. Therefore, the electric motor 15 immediately stops rotating without any time delay. Therefore, the hydraulic pump 14 is also stopped, pressure oil is not sent from the tank 16 to the cylinder 2, the car 5 is stopped, and excessive movement in the upward direction is prevented.

It should be noted that on floors other than the top floor, even if the car rises too high, passengers will not be trapped in the car and equipment will not be damaged due to collision of the plunger with the stopper, so there is no need to use the circuit as described above.

Further, the lowering of the car is carried out by an appropriate means, such as opening the lowering electromagnetic valve 13 while the electric motor 15 is stopped and utilizing the weight of the car 5.

As explained above, the hydraulic elevator control device according to the present invention detects this with its detection device and starts the hydraulic pump when the car rises excessively from the normal stopping position at the top stage due to a failure of the solenoid valve for lifting. By immediately stopping the driving electric motor,
Since it is possible to reduce the excessive rise of the car, even if the lift solenoid valve fails, passengers will not be trapped in the car or equipment will be damaged due to the car rising too far in the upward direction. Therefore, there is an effect that the safety of the hydraulic elevator can be improved.

[Brief explanation of the drawing]

FIG. 1 is a configuration explanatory diagram showing an embodiment of a control device for a hydraulic elevator according to the present invention, and FIG. 2 is an electric circuit diagram thereof. 2...Cylinder, 3...Oil, 4...Plunger, 5...Cage, 6...Over-rise detection switch, 7
...Cam, 8...Top floor position switch, 9...Cam, 10...Top floor landing floor, 11...Pipeline, 12
...Solenoid valve for lifting, 14...Hydraulic pump, 15...
...Electric motor, 16...Tank, 18...Ascent solenoid valve control circuit, 20...Motor control circuit.

Claims (1)

[Claims] 1 It has a cylinder for moving the car, a hydraulic pump that sends pressure oil to this cylinder via a lifting solenoid valve, and an electric motor that drives this pump, and drives the electric motor during lifting operation, and Open the solenoid valve to send pressure oil to the cylinder,
In a hydraulic elevator that closes the solenoid valve for ascending when stopped and stops the rotation of the electric motor after a certain period of time, there is a device that detects when the car is on the top floor, and a device that detects when the car is on the top floor beyond the normal stop position. and a device for detecting that the car has risen, and when the car rises above the normal stopping position at the top floor due to the operation of the device, the rotation of the electric motor is immediately stopped. Elevator control device.