JPH0323169A - Control device for hydraulic elevator - Google Patents

Abstract

PURPOSE:To alleviate a starting shock without any use of a check valve by controlling hydraulic pressure so that a pressure difference between the hydraulic jack of an electromagnetic valve and a hydraulic pump is within the predetermined range, and then opening the electromagnetic valve. CONSTITUTION:At the time of a startup, a speed control device 16 drives an induction electric motor 7 via an inverter device 18 so that a difference between the hydraulic pressure of an hydraulic jack of an electromagnetic valve 9 and the hydraulic pressure of the hydraulic pump 8 detected with the first and second hydraulic pressure detectors 21 and 22 falls within the predetermined range, thereby controlling the delivery pressure of the hydraulic pump 8. Furthermore, when the difference is outside the predetermined range, a solenoid 10 is excited via an electromagnetic valve control device 17 and the electromagnetic valve 9 is thereby wide open. Also, output from the first hydraulic pressure detector 21 is generated only when an operation contact 23 and a door open detection relay contact 24 are turned on, thereby eliminating a noise effect due to operation. According to the aforesaid construction, a starting shock can be substantially alleviated with the electromagnetic valve 9 without any use of a check valve.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to a device for controlling a hydraulic elevator.

[Conventional technology]

Conventional. In a hydraulic elevator. For example, JP-A-63-25
As shown in No. 2885. An electromagnetic switching valve with a check valve is used between the hydraulic pump and the hydraulic jack. There is a flow path loss at this check valve. Moreover, the structure of the electromagnetic switching valve is complicated and expensive. For this reason.
Eliminate check valves. We use a solenoid valve that simply opens and closes the hydraulic circuit using a solenoid. Low flow path loss. A control device for a hydraulic elevator that is also inexpensive to construct has been proposed.

FIG. S is a structural diagram showing a control device for the hydraulic elevator.

In the figure. (1) is a plunger 《2》 installed at the bottom of the hoistway.
Hydraulic jack with (3) is a sheave attached to the top of plunger (2). (4) is the main rope wrapped around the sheave [3]. One end is the heel (5) and the other end is the fixed part (6).
] are connected to each other. (7) is an induction motor connected to a reversibly rotatable hydraulic pump (8). {9} is a solenoid valve placed between the hydraulic jack {1} and the hydraulic pump (8). The solenoid a● is configured to close the oil passage when it is deenergized, and to open it when it is energized.

0 is Aburayujiku. Hydraulic jack (1). Solenoid valve (9).
Hydraulic pump (8) and oil pump aD are each pipe aa
-1141 is connected. (19 is an electric motor (7)
A speed detector connected to the motor to detect rotational speed. ae is a speed control device composed of a microcomputer (hereinafter referred to as microcomputer), which inputs a signal from a speed detector a9 and outputs a control signal. The wholesaler is a solenoid valve control device that controls the solenoid aO in response to commands from the speed control device aS. aII is an inverter device that drives the electric motor {7} according to a command from the speed control device 611.

The conventional hydraulic elevator control device is configured as described above. When the car (5) stops. The solenoid (Il1) of the electromagnetic valve (9) is deenergized and the line 0.fi1 is closed.

When the command to ascend is given. Solenoid valve control device +1? The solenoid is energized by l. The solenoid valve (9) is fully open. conduit aa
, as communicate. at the same time. The electric motor (7) rotates. The rotational speed of the electric motor (7) is controlled by the speed control device aS and the imperter device (1 type).The rotational speed of the hydraulic pump (8), that is, the discharge amount of the hydraulic pump (8) is controlled. (8) The oil in the oil tank a is sucked and discharged through the pipe aaffr: and sent to the hydraulic jack (1) through the pipe 03, the solenoid valve (9) and the pipe (L6'i).

therefore. The basket (5) is the plunger (2). Sheave (3
) and the main rope (4). It rises according to a predetermined speed pattern. During this time. The solenoid valve (9) is fully open. There is less flow path loss compared to those using check valves.

Also. When a descending operation command is issued. Same as above, solenoid valve (9
》 is fully opened. Pipes (13, (13) are connected. This causes the pressure oil to be discharged by the weight of the hydraulic jack (1) and the heel (5). Pressure oil flows through the pipe (I3. Solenoid valve (9). αj. Returns to the oil tank +111 through the hydraulic pump (81 and pipe a4). This causes the hydraulic pump (8) to rotate. The electric motor (7) acts as a generator. Using its dynamic braking, In addition to controlling the descending speed of the toe (5),
Regenerate moving power. At this time too. The rotational speed of the electric motor (7) is controlled by the speed control device α and especially the imperter device.

[Problem to be solved by the invention]

In the conventional hydraulic elevator control device as described above.
Because the solenoid valve (9) is fully opened when starting the car (5), when the solenoid valve (9) opens, due to the pressure difference in the pipe 0.u, pressure oil flows to the hydraulic jack (1). The flowed in. The flowed out from the hydraulic jack <<1>>.For this reason.
The car (5) rises or falls once during startup, impairing ride comfort. In other words, there is a problem in that the passenger is given a start-up shock.

This invention was made to solve the above problems. Even if a solenoid valve without a check valve is used. The purpose of the present invention is to provide a control device for a hydraulic elevator that can significantly reduce the starting shock.

[Means to solve the problem]

A control device for a hydraulic elevator according to the present invention is as follows. The first oil pressure detector detects the oil pressure on the hydraulic jack side of the solenoid valve.
The second oil pressure detector detects the oil pressure on the hydraulic valve side of the solenoid valve. When the car is started, a solenoid valve provided between the first hydraulic pressure ν and the hydraulic pump is opened.

[Effect]

Item 1: The solenoid valve is opened after controlling the valve so that the Pressure oil suddenly flows into the hydraulic cylinder after the solenoid valve is opened. There will be no sudden leakage from the hydraulic cylinder.

〔Example〕

Figures 1 to 3 are diagrams showing one embodiment of this invention. 1st
The figure is a configuration diagram. Figure 2 is a block diagram of the hydraulic control system. Figure 3 is a diagram explaining the operation. Portions similar to those of the conventional device are designated by the same reference numerals.

In Figure 1. The QD is installed in the pipe α2 and is equipped with a hydraulic jack (1
) in the hydraulic pressure Pj ″f1: first pressure detector to detect.
cl3 is a second pressure detector that is installed in the pipe a3 and detects the hydraulic pressure Pp output from the hydraulic pump (81). Q3 is a driving relay contact that is closed while a driving command is issued.
5) is a door open detection relay contact that closes when the door is open and opens when the door is closed. In addition. Speed control device (Il!,
Solenoid valve control device (17). Inverter device and contacts (
To). (foundation), the startup control circuit is constructed of
In the figure, ba#'i memory circuit. 03 is a comparison circuit. c! 3 is the speed control device Oe, the inverter device shaft and the electric motor (7)
A motor control device consisting of Km is the overall gain constant, and Kp is the gain constant of the hydraulic pump 18.

next. The operation of this embodiment will be explained with reference to FIG.

now. Assume that car T5) is stopped and the door is open.
The operation relay contact (to) is open. Door open detection relay contact (
Self) is closed.

When a driving command is issued at time t1 in Figure 3. The contact (self) is closed. with this. The output of the first pressure detector Qυ is the contact point (to). The signal is input to the storage circuit Go via the memory circuit Go and stored therein. and. The output of the memory circuit (41) is given to the comparison circuit (to) as an input to the hydraulic control system. It is compared with the output of the second pressure detector (own). the result. Oil and vinyl will come soon. When the door closes at time t2. The points of contact (goods) are open. The input from the first pressure detector QD to the memory circuit 0υ is cut off. this is. While the car (5) is running. This is because inputting the oil pressure in the hydraulic jack (1), which fluctuates as the vehicle travels, may disturb the speed control system and cause control problems. In this way. Although the input to memory circuit 01 is cut off. The output oil pressure Pj is stored and held.

next. A signal is given from the speed control device is to the solenoid valve control circuit an to open the solenoid valve (9). solenoid aω
is energized and the solenoid valve <9> is fully opened. At this time. There is almost no pressure difference between pipes AS and AS. There is no start-up shock. Cart <<5>> starts smoothly. continue. The operation of the speed control system starts from time t3. As shown by curve A, the toe (5) starts running.

When car +51 stops at time t4, the contact (to) opens. When the door opens, the contacts close.

The above startup behavior is as follows. The same applies when ascending and descending.

Among them, in the above example. A second oil pressure detector (self) for detecting the oil pressure Pp of the output of the hydraulic pump +81 was used, but it was assumed to be cheap and simple. Even if the configuration is as shown in FIG. 4, it can be put to practical use.

Figure 4 is a block diagram of a hydraulic control system showing another embodiment of this invention. In the figure (to) is the gain adjustment circuit, and Ka is its gain constant. Kj is a gain constant for the first oil pressure detector r2+) and the memory circuit oD.

In other words. Constants Kl, Km. This is because Kp is a value known in advance. If the gain Ka f of the gain adjustment circuit (to) is set as shown in the formula below. Hydraulic pump {8}
It is also controlled so that the motions such as shaking are also suppressed.

〔Effect of the invention〕

Have you explained the above? , 6 In this invention. Hydraulic pressure on the hydraulic jack side of the solenoid valve at startup. I decided to release the oil on the hydraulic pump side. Pressure oil suddenly flows into the hydraulic cylinder after the solenoid valve is opened. There was no possibility of sudden leakage from the hydraulic cylinder. Even if you use a solenoid valve without a check valve.
The starting shock can be greatly reduced. This has the effect of making the hydraulic elevator comfortable to ride.

[Brief explanation of drawings]

Figures 1 to 3 are diagrams showing an embodiment of a control device for a hydraulic elevator according to the present invention. Figure 1 is a diagram of the composition. Figure 2 is a block diagram of the hydraulic control system. Figure 3 is a diagram explaining the operation. Fourth
The figure is a block diagram of a hydraulic control system showing another embodiment of this invention. FIG. 5 is a block diagram showing a conventional hydraulic elevator control device. In the figure. (1) is the hydraulic jack. (5) is the cage. (7) is the induction motor. C8 is the hydraulic pump. (9) is the solenoid valve.
l1 speed control device. an is a solenoid valve control device. fi
l is an inverter device. QD is the first oil pressure detector. The gradient is g
A2 oil pressure detector. cl3 is the operation relay contact. cl4 is a door open detection relay contact. inside. The same reference numerals in the figures indicate the same parts.

Claims (1)

[Claims] A hydraulic jack that drives the car, an electric motor connected to an inverter device and controlled at variable speed, a hydraulic pump driven by the electric motor, and a hydraulic jack provided between the hydraulic pump and the hydraulic jack. a first oil pressure detector for detecting oil pressure on the side of the hydraulic jack of the electromagnetic valve;
A second oil pressure detector is provided to detect the oil pressure on the hydraulic pump side of the solenoid valve, and the output of the first oil pressure detector and the output of the second oil pressure detector are compared when the car is started. A control device for a hydraulic elevator, comprising: a start-up control circuit that controls the flow rate of pressure oil of the hydraulic pump so that the difference falls within a predetermined range, and then opens the solenoid valve.