JPH07121789B2 - Hydraulic elevator controller - Google Patents

Description

TECHNICAL FIELD The present invention relates to an improvement of a control device for a hydraulic elevator.

[Conventional technology]

FIG. 3 shows a conventional hydraulic elevator control system. In the figure, (1) is a pump (the output hydraulic pressure is P _p ), (2) is a motor for driving the pump (1), and (3) is a speed detector for detecting the speed of the motor (2). , (4) is a hydraulic pressure detector for pump output P _p , (5) is a control valve, (6) is a hydraulic pressure detector for a jack, (7) is an oil pipe (shown by a thick line), and (8) and (9) are , An elevator control for connecting a branch oil pipe from the jack to the control valve (5), which is provided on a branch oil pipe branched in parallel to an oil pipe (7) communicating between the control valve (5) and a jack described later. A first auxiliary valve that opens and closes in response to an opening / closing command (operation signal) from the device, and an oil pipe (7) that connects the first auxiliary valve and an oil tank to be described later are provided in the first auxiliary valve. Open and close the oil pipe from the auxiliary valve to the hydraulic tank according to the open / close command (operation signal) from the elevator controller. The auxiliary electromagnetic valve constituting a second auxiliary valve (10) is mounted hydraulic jacks for raising and lowering the car of the elevator (the oil pressure in the jack P _j), (11) is a plunger (12) to the upper end of the plunger A pulley wound around a pulley (12) with one end fixed to a car and the other end fixed to the ground, (14) a car, (15),
(16) is a pulley, (17) is a rope fixed to the car at one point and is wrapped around pulleys (15) and (16), and (18) is the amount of movement of the car due to its rotation connected to the pulley (16) For detecting the movement of the car, (19) is the first when the car is stopped
An opening command is sent to the auxiliary solenoid valve (8) as the auxiliary valve and a closing command is sent to the auxiliary solenoid valve (9) as the second auxiliary valve to maintain the control valve (5) in the closed state. , An elevator control device as a control means for moving the scale by controlling the hydraulic pressure of the pump (1) to be equal to the hydraulic pressure of the jack (10) based on a start command before starting traveling, (2
0) indicates a motor drive device, and (21) indicates an oil tank.

Next, the operation will be described. When the car is stopped, opening / closing of the auxiliary solenoid valves (8) and (9) is controlled by operation signals (19b) and (19c) from the elevator control device (19), and the solenoid valve (8) is in the open state. The solenoid valve (9) is closed,
In such a state, the control valve (5) is closed by receiving downward pressure from the jack (10) by the hydraulic pressure via the solenoid valve (8).

Next, when a start command (not shown) is issued, the elevator control device (19) uses the control signal (19a) to drive the motor drive device (2).
The hydraulic pressure P _p of the output of the pump (1) is controlled to be equal to the hydraulic pressure P _j of the jack (10) via the motor (0) and the motor (2). By controlling in this way, the next time the control valve (5) is opened and started, the car (14) will start running smoothly without instantaneously moving up or down due to the pressure difference between P _p and P _j. You can This is called scale activation.

Next, when shifting to the traveling state, the solenoid valve (8) is closed and the solenoid valve (9) is opened so that the control valve (5) is in a free state. At this time, as described above, the pump (1)
Since the output hydraulic pressure P _p is controlled to be equal to the hydraulic pressure P _j of the jack (10), the car (14) does not move.

Then, when a speed command (not shown) is given, the flow rate of the pump (1) is controlled by controlling the rotation speed of the motor (2) so that the car (14) runs according to the speed command.

[Problems to be Solved by the Invention]

Since the conventional device operates as described above, when the pressure P _p of the pump (1) is larger than the pressure P _j of the jack (10) at the time of starting the scale described above, the control valve (5) is pushed up. ,
The basket (14) starts moving upward. Therefore, in the normal state,
P _p is controlled so as not to be larger than P _j by a predetermined value or more.

Now, when the scale is started in a state where the control circuit of the pump (1) is out of order such that P _p > P _j , the control valve (5) is instructed to close and is not in the running state. Regardless, the basket (14) has a problem of moving up. Such a state itself is dangerous, and if the control device (19) runs with a failure, it may become more dangerous.

The present invention has been made to solve the above-mentioned problems associated with the conventional example, and promptly detects that the car is moving upward even when the balance is not in a running state at the time of starting the scale, and becomes a dangerous state. It is an object of the present invention to obtain a hydraulic elevator control device capable of avoiding the above.

[Means for Solving the Problems]

A control device for a hydraulic elevator according to the present invention is provided between a hydraulic jack that raises and lowers a car and a pump that sends hydraulic oil to the hydraulic jack, and is closed when the hydraulic pressure of the jack is higher than the hydraulic pressure of the pump. The control valve which is maintained when the hydraulic pressure of the pump is higher than the hydraulic pressure of the jack and an oil pipe communicating between the control valve and the jack are provided in a branch oil pipe that is branched in parallel with the control valve. From the first auxiliary valve provided on the first auxiliary valve that opens and closes the branch oil pipe from the control valve to the control valve in accordance with the opening / closing command and the oil pipe that communicates between the first auxiliary valve and the oil tank. A second auxiliary valve that opens and closes an oil pipe to the hydraulic tank according to an opening / closing command, and sends an opening command to the first auxiliary valve and a closing command to the second auxiliary valve when the car is stopped. Above control While maintaining a closed state, in the control device of the hydraulic elevator equipped with a control means for starting the scale by controlling the hydraulic pressure of the pump to be equal to the hydraulic pressure of the jack based on a start command before traveling start, A traveling detection circuit that detects traveling of the car, and an abnormal traveling that detects an abnormal traveling at the time of starting the scale based on the traveling detection signal and the opening / closing command to the first and second auxiliary valves and outputs an abnormality detection signal. A detection circuit, and the control means stops rotation of a motor for driving the pump based on the abnormality detection signal.

[Action]

According to the present invention, when abnormal traveling is detected at the time of starting the scale based on the traveling detection signal and the opening / closing command to the first and second auxiliary valves, the rotation of the motor for driving the pump is stopped to prevent danger. To avoid the situation.

〔Example〕

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

First, in FIG. 1, where the same parts as those in FIG. 3 have the same reference numerals, (22) is a running detection circuit for detecting running of the car, and (2)
3) is a scale based on the traveling detection signal and the closing control command signal to the control valve (5), that is, the opening / closing commands to the auxiliary solenoid valves (8) and (9) as the first and second auxiliary valves. The elevator control device (1) is an abnormal traveling detection circuit that detects an abnormal traveling at startup and outputs an abnormal detection signal.
In 9), the rotation of the motor controlling the pump (1) is stopped based on the abnormality detection signal.

FIG. 2 illustrates the operation of the present invention.
Figures (a) and (b) show the states of the operation signals (19b) and (19c) of the auxiliary solenoid valves (8) and (9), respectively, and the time of Figure 2 (c).
t1 indicates the time when the start command is issued. Hereinafter, description will be given with reference to FIG. First, when a start command is issued, the output P _p of the pump (1) rises as shown by the broken line (Fig. 2 (c)).
At this time, the running command has not been issued yet, so the solenoid valves (8) and (9) are issued with the open command and the close command, respectively (Figs. 2 (a) and (b)). The control valve (5) is closed. Since it is assumed now that the control circuit of the pump (1) has failed and the output has been increased, the pressure P _p of the pump (1) exceeds the pressure P _o of the jack (10) and the control valve (5). Push to open and increase further. By this pressure, the figure (d)
Push up the plunger (11) to the basket (14) as shown in
To move.

Car travel detection circuit (22) when the car reaches a predetermined speed V _o,
This is detected and the output (22a) is output to the abnormal running detection circuit (23) as shown in FIG. The abnormal travel detection circuit receives the signal (22a) and the closing control command of the control valve (5), that is, the open signal of the operation signal (19b) and the close signal of the operation signal (19c), and outputs the abnormal travel signal (23a). Occur.

The control device (19) receives the abnormal traveling signal (23a) and acts to stop the motor (2) in an emergency via the control signal (19a) and the motor drive device (20) (Fig. 2 (f)).
Therefore, the car (10) stops traveling.

〔The invention's effect〕

As described above, according to the present invention, when a situation occurs in which the car moves up despite the fact that the car is not in the running state due to some failure at the time of starting the scale, this is promptly detected and the pump is controlled. By stopping the motor, it is possible to avoid a dangerous state and ensure the safety of the system when the scale is started.

[Brief description of drawings]

FIG. 1 is a block diagram of a hydraulic elevator control device according to an embodiment of the present invention, FIGS. 2 (a) to 2 (f) are operation waveform diagrams of respective parts thereof, and FIG. 3 is a block diagram of a hydraulic elevator according to a conventional example. is there. In the drawings, the same reference numerals indicate the same or corresponding parts.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroyuki Ikeshima 1 Hishimachi, Inazawa, Aichi Prefecture Mitsubishi Electric Corporation Inazawa Manufacturing (72) Inventor Takaaki Aoi 1 Hishimachi, Inazawa, Aichi Mitsubishi Electric Corporation Inazawa Plant (72) Inventor Takehiko Kubota 1 Hishimachi, Inazawa City, Aichi Mitsubishi Electric Co., Ltd. Inazawa Plant (56) References JP 63-252885 (JP, A) JP 60-209484 (JP) , A)

Claims (1)

[Claims] 1. A hydraulic jack of a pump which is provided between a hydraulic jack for raising and lowering a car and a pump for sending hydraulic oil to the hydraulic jack and maintains a closed state when the hydraulic pressure of the jack is higher than the hydraulic pressure of the pump. Is opened when the pressure is higher than the hydraulic pressure of the jack, and a branch oil pipe branched in parallel to an oil pipe communicating between the control valve and the jack is provided to connect the jack to the control valve. A first auxiliary valve for opening and closing the branch oil pipe in response to an opening / closing command,
A second auxiliary valve provided on an oil pipe that communicates between the first auxiliary valve and the oil tank, for opening and closing the oil pipe from the first auxiliary valve to the hydraulic tank in response to an opening / closing command, and a car At the time of stop, an opening command is sent to the first auxiliary valve and a closing command is sent to the second auxiliary valve to maintain the control valve in the closed state, and at the same time, the pump is operated based on the start command before traveling is started. In a control device for a hydraulic elevator equipped with control means for activating a scale by controlling hydraulic pressure to be equal to the hydraulic pressure of the jack, a traveling detection circuit for detecting traveling of a car, the traveling detection signal, and the first And an abnormal traveling detection circuit that detects an abnormal traveling at the time of starting the balance based on an opening / closing command to the second auxiliary valve and outputs an abnormal detection signal, and the control means described above based on the abnormal detection signal. The model that drives the pump Control device for a hydraulic elevator, characterized in that stops the rotation of the motor.