JPH0439278A - Hydraulic elevator device and control device thereof - Google Patents

Abstract

PURPOSE:To prevent the generation of a shock during elevation and a stop by locating a solenoid valve to a pilot circuit, controlling the solenoid valve according to an elevating period and a stop period, and opening or closing an inflow circuit or a discharge circuit for pressure oil. CONSTITUTION:For example, according to a rise operation command for a cage 2, the running direction and the running speed of an electric motor 4 are controlled by a control device 16 to run a hydraulic pump 3. This operation increases an oil pressure in a first circuit 6a. When an oil pressure in the first circuit 6a is increased to a value equal to an oil pressure in a second circuit 6b, a solenoid valve 15 is energized by the control device 16, a pressure oil inflow circuit 9a is closed and the flow of pressure oil in the circuit 9a is blocked. Simultaneously, a solenoid valve 10 is energized to open a pressure oil discharge circuit 9b, and pressure oil in a back chamber 5c of an on-off valve 3 is returned to an oil tank 8. Thereafter, the control device 16 controls a rise according to a given rise pattern. During lowering and a stop, opening and closing are carried out according to respective states.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a hydraulic elevator system and its control system.

[Conventional technology]

Figure 3 shows the configuration of a conventional hydraulic elevator system, with (1) a hydraulic jack and (2) a hydraulic jack (1).
(3) is a reversibly rotatable hydraulic bomb, (4) is an electric motor that drives the hydraulic pump (3), (5)
is the main chamber (5a) and the main chamber (5a) via the valve body (5b)'.
) and a separated back N (5C), and a hydraulic jack (
A main chamber (5a) is connected between the main chamber (5a) and the hydraulic pump (3).

The valve body (5b) is operated to allow pressure oil to flow into and out of the back chamber (5C) to open and close the hydraulic passage between the hydraulic jack fi+ and the hydraulic pump (3), and the car (2) An on-off valve that opens when the car is going up and down and closes when the car (2) is stopped. (6) connects the hydraulic jack (1), the on-off valve (5), and the hydraulic pump (3) in sequence. (7) is the filter, (8) is the oil tank, (9) is the pressure oil inflow circuit (9a) that connects the hydraulic jack (1) and the back chamber (5C) of the on-off valve (5). and the back chamber of the on-off valve (5) (5 (rito oil tank)
8) and a pilot circuit consisting of a pressure oil discharge circuit (9b) connected to the pressure oil discharge circuit (9b), αG is a normally closed solenoid valve that is provided in the pressure oil discharge circuit (9b) and opens or closes the pressure oil discharge circuit (91)).

συ is a variable throttle or valve installed in the pressure oil inflow circuit [9a].

α2 is a variable throttle valve provided in the pressure oil discharge circuit (9b).

(1 is a control device that controls the opening and closing of the solenoid valve αG and the electric motor (4) that drives the hydraulic pump (3).
Of the main circuit (6), there is an 81 circuit (6a) between the on-off valve (5) and the hydraulic cylinder 1 (3), and a t-2nd circuit (6b) between the hydraulic jack fil and the on-off valve (5). In addition, the variable throttle valve αD provided in the pilot circuit (9) has a larger degree of restriction than the variable throttle valve a'a, and the flow rate of the pressure oil passing through the variable throttle valve α2 is higher than that of the variable throttle valve a'a. many.

Next, the operation of the conventional hydraulic elevator system configured as described above will be explained.

First, the upward operation of the car (2) will be explained.

When the ascending operation command is issued from the operation control device (not shown) of the hydraulic elevator, the staining machine (4) is operated with the direction and speed of rotation controlled by the control device αJ, and the hydraulic pump (3) connected thereto is operated. ) is driven.

The oil pressure in the first circuit (6a) increases. And the first circuit (
A detection device (not shown) detects that the oil pressure in the second circuit (6a) has become the same as the oil pressure in the second circuit (6b).

When the solenoid valve α provided in the pressure oil discharge circuit (9b) of the pilot circuit (9) is energized by the control device (13), the pressure oil discharge circuit [9b] opens.This opens the on-off valve ( 5
) The pressure oil in the back chamber (5C) is discharged to the oil tank (8) through the pressure oil discharge circuit (9b), and the on-off valve (5) is opened. After this, the electric g! When It41 is operated, the hydraulic pump (3) is driven and the pressure oil discharged from the hydraulic pump (3) passes through the on-off valve (5) and flows into the hydraulic jack (1).
) will rise.

When stopping the car (21), the electric motor (4) is controlled by the control device αJ according to a predetermined stop pattern.

A hydraulic pump (3) connected to this is driven. When the car (2) reaches the stop floor, the hydraulic pump (3) no longer discharges pressure oil, and only the hydraulic pressure for holding the car (2) at the stop floor is generated. In this state, when the solenoid valve α1 provided in the pressure oil discharge circuit (9b) is deenergized and the pressure oil discharge circuit (9b) is closed to prevent the discharge of pressure oil to the oil tank (8), the hydraulic jack The pressure oil (1) passes through the pressure oil inflow circuit (9a)' and the back chamber (5) of the on-off valve (5).
5C] and the on-off valve 15) is closed. This ensures that Shikato (2) stops.

Next, the descending operation of the car (2) will be explained.

When a descending operation command is issued, the control device αJ activates the magnetic valve (1).
is energized and the pressure oil discharge circuit (9b) is opened.

As a result, the pressure oil in the back chamber (5C) of Q on-off valve +51 is removed from the oil tank (
8) and the on-off valve (5) opens. Open/close valve (5
) opens, the hydraulic jack fi1 yen of pressure oil flows into the cage (
2) is pushed out by its own weight and is discharged to the oil tank (8) via the hydraulic jack (1) → on-off valve (5) → hydraulic bong 1 (3) → filter (7). At this time, the control device 13
The yosimi motive (4) is activated in the opposite direction to the rise of the heel (2).

The hydraulic pump (3) discharges the pressure oil of the hydraulic jack (1). However, the amount of oil discharged by the hydraulic pump (3) is larger than the amount of oil pushed out from the hydraulic jack (1) by the weight of the toe (2), so this oil flow can be used to 3) is driven, and the electric motor (4) connected to the hydraulic pump (3) is operated to generate electricity. Therefore, the control device α
By controlling the amount of power generated by the sink motor (4), the shaft (2) is lowered according to a predetermined operation pattern.

[Problem to be solved by the invention]

In the conventional hydraulic elevator system as described above, when an ascending operation command (2), for example, is issued, the on-off valve (2) is first activated.
5) opens, and then, after a slight delay, pressure oil from the hydraulic pump (3) begins to flow into the hydraulic jack (1), and the car (2) begins its full upward movement.

In other words, when the car (2) is in ascending operation, the solenoid valve (L
G operates, the pressure oil discharge circuit (9b) opens, and the pressure oil in the back chamber (5C) of the on-off valve +51 is discharged to the oil tank (8).

The on-off valve (5) opens.

However, at the same time, the pressure oil in the hydraulic jack (1) changes to the pilot rotation M f91, that is, the hydraulic jack (1)→
The car (2) begins to descend through the variable throttle valve α9 → solenoid valve a1 → variable throttle valve aZ to be discharged to the oil tank (8). Immediately after this, pressurized oil from the hydraulic pump (3), which started driving upward, is injected into the hydraulic jack (1), so the heel (2) in the downward state suddenly begins to rise, causing a so-called starting shock. There was a problem with it happening.

Also, when the car (21i) is lowered, a starting shock occurs in the same way as when the car (2) is raised.However.

This start-up shock is small compared to the upward operation in (2).

This invention was made in order to solve the above-mentioned problems, and provides a hydraulic elevator system that eliminates the starting shock that occurs when the heel 12) of the hydraulic elevator system is raised or lowered, and that can be started stably. The purpose is to provide a control device.

[Means to solve the problem]

A hydraulic elevator device according to the present invention includes a hydraulic pump connected to a hydraulic jack and driven by an electric motor, a main chamber and a back chamber separated from the main chamber via a valve body, The main chamber is connected to the hydraulic pump, and the valve body for oil inflow and outflow to the back chamber is operated to open and close the hydraulic flow path between the hydraulic jack and the hydraulic pump, and is opened when the car is raised or lowered.

A pilot circuit consisting of an on-off valve that closes when stopped, a hydraulic inflow circuit that connects the hydraulic jack and the back chamber of the on-off valve, and a pressure oil discharge circuit that connects the back chamber of the on-off valve and an oil tank;
Provided in the pilot circuit.

A solenoid valve that opens or closes the pressure oil inflow circuit or the pressure oil discharge circuit, and a control device that controls the opening and closing of the solenoid valve in response to when the car is raised and lowered and when it is stopped are provided.

Moreover, the control device for a hydraulic elevator according to the present invention includes:
When opening the on-off valve, the pressure oil inflow circuit of the pilot circuit is closed, or at the same time, the pressure oil discharge circuit of the bike short circuit is opened.

[Effect]

A hydraulic elevator system configured as described above.

A solenoid valve is provided in the pilot circuit, and this solenoid valve opens or closes a pressure oil inflow circuit or a pressure oil discharge circuit, and this solenoid valve is controlled in response to when the car is raised and lowered and when it is stopped.

In addition, the control device for the hydraulic elevator device configured as described above operates a solenoid valve provided in the pilot circuit to open the pressure oil discharge circuit and simultaneously or thereafter close the pressure oil inflow circuit. Therefore, when the car is raised or lowered, the pressure oil in the hydraulic jack is not directly discharged into the oil tank through the pilot circuit.

〔Example〕

Hereinafter, Embodiment 1 of the present invention will be explained with reference to FIG. Explain the part.

α5 is a normally open solenoid valve that is installed in the pressure oil inflow circuit (9a) of the pilot circuit (9) and opens or closes the pressure oil inflow circuit (9a)'; This is a control device that controls the electric motor (4) that drives the electric motor (4) that drives the electric motor (4).

Next, the operation of this embodiment will be explained.

First, the upward operation of the car (2) will be explained.

When the ascending operation command is issued from the operation control device (not shown) of the hydraulic elevator, the staining machine (4) is operated by controlling the rotational direction and rotational speed by the control device αe, and the hydraulic pump (3) connected thereto is operated. ) is driven and the first circuit (6a)
oil pressure increases. Then, a detection device (
(not shown), and the pressure oil inflow circuit M is detected by the control device ae.
When the solenoid valve σ9 provided in (9a) is energized, the pressure oil inflow circuit (9a) is closed and the pressure oil inflow circuit (9a) is closed.
The flow of pressure oil is blocked. At the same time or after this, the control device ne energizes the solenoid valve α9 provided in the pressure oil discharge circuit (9b) to open and close the pressure oil discharge circuit (9b).

As a result, the pressure oil in the back chamber (I73) of the on-off valve (5) is discharged to the oil tank (8) through the pressure oil discharge circuit (9b), and the on-off valve opens. When the electric motor (4) is operated according to a predetermined ascending pattern.

The hydraulic pump (3) is driven and the pressure oil discharged from the hydraulic cylinder 1 (3) passes through the on-off valve (5) and is supplied to the hydraulic jack (1).
), the basket (2) rises.

When the car f21'jt is stopped, the electric motor (4) is controlled by the control device σe according to a predetermined stop pattern.

The hydraulic pump (3) connected to this is driven, and when the car (2) reaches the stop floor, no pressure oil is discharged from the hydraulic pump (3), and the car (21) is moved to the stop floor position. Only the hydraulic pressure for holding the oil is generated. In this state, when the solenoid valve α provided in the pressure oil discharge circuit (9b) is deenergized, the pressure oil discharge port m (9b) is closed and the oil tank ( 8). At the same time or after this, the control device α
Solenoid valve α9 provided in the pressure inflow circuit [9a] by e
is deenergized and the pressure oil inflow circuit (9a) is opened.

As a result, the hydraulic jack filO pressure oil flows into the back chamber (5C) of the on-off valve (5) through the pressure oil inflow circuit.
) is closed, so that (2) will surely stop.

When the car (2) is running down, the on-off valve (5) opens in the same way as when the car (2) is running up. Thereafter, the staining machine (4) is controlled by the control device σe in accordance with a predetermined operation pattern, and the car (2) is lowered, but this is the same as the conventional device, so a description thereof will be omitted.

In this embodiment, a normally closed solenoid valve αS is provided in the pressure oil inflow circuit (9a), and the pressure oil discharge circuit (9b
) becomes a closed circuit. Therefore, the pressure oil in the hydraulic jack (1) is not discharged directly to the oil tank (8) through the pilot circuit (91), so when the car (2) starts to rise or fall, it is not activated like in conventional devices. There will be no shock.

FIG. 2 shows another embodiment according to the present invention. In FIG. 1, parts that are the same as or corresponding to those of the conventional device shown in FIG. Explain the part. αD is a solenoid valve provided in the pilot circuit, and this solenoid valve ση is connected to the hydraulic jack (II), the back chamber (5C) of the on-off valve C51, and the oil tank (8), and is connected to the pressure oil inflow circuit (9a) and It opens and closes the pressure oil discharge circuit (9b), and when the pressure oil inlet 14 (9a) is opened, the pressure oil discharge circuit (9b) is closed, and conversely, the pressure oil discharge circuit (9b) is closed.
When the pressure oil inflow circuit (9b) is closed, the pressure oil inflow circuit (9a) is opened. αg is a control device that controls the opening and closing of the electromagnetic valve (171) and the electric motor (4) that fully drives the hydraulic pump (3).

In this embodiment, in order to raise and lower the car (2), when the stain magnetic valve α71 is energized by the control device α mark, the pressure oil inlet @
(9a) is closed, and the pressure oil discharge circuit (9b) is opened.

With this, the on-off valve (51p"3 pressure oil is the pressure oil outlet w
I! Since it is discharged to the oil tank (8) through r (9b),
The on-off valve (5) opens. Further, when the stain magnetic valve αnt is deenergized by the control device α barrel in order to stop the car (2), the pressure oil inflow circuit (9a) is opened and closed, and the pressure oil discharge circuit (9b) is closed. As a result, the pressure oil in the hydraulic jack (1) passes through the pressure oil inlet M (9a) to the back chamber (5) of the on-off valve (5).
5C), the on-off valve +51 is closed.

Other than this, the explanation is omitted because it is the same as the embodiment shown in FIG. 1, but in this embodiment, the pilot circuit (9) is used instead of the solenoid valve αGα9 shown in the embodiment of FIG. When the pressure oil inflow circuit (9a) is opened, the pressure oil discharge circuit (
9b) is closed, and conversely, when the pressure oil discharge circuit (9b)' is closed, the pressure oil inflow circuit (9a) is opened. Because we have set up.

The pressure oil in the hydraulic jack (1) is not directly discharged to the oil tank (8) through the pilot circuit (9).

〔Effect of the invention〕

As explained above, the hydraulic elevator system according to the present invention includes a solenoid valve in the pilot circuit.

This solenoid valve opens or closes the pressure oil inflow circuit* or the pressure oil discharge circuit, and this solenoid valve is controlled in response to when the car goes up and down and when it stops, so the shock that occurs when the car goes up and down and stops. can be prevented.

This has the effect of improving riding comfort.

Further, the control device for a hydraulic elevator system according to the present invention operates a solenoid valve provided in the pilot circuit to open the pressure oil discharge circuit and simultaneously or thereafter closes the pressure oil inflow circuit.

Since the pressure oil in the hydraulic jack is not directly discharged into the oil tank through the pilot circuit when the car is raised or lowered, there is almost no starting shock when the car is raised or lowered, resulting in a significant improvement in riding comfort.

[Brief explanation of drawings]

Fig. 1 is a hydraulic circuit diagram showing a hydraulic elevator system according to an embodiment of the present invention, Fig. 2 is a diagram corresponding to Fig. 1 showing another embodiment of the invention, and Fig. 3 is a conventional hydraulic elevator system. It is a hydraulic circuit diagram showing. (1)... Hydraulic jack, (21... Car, (3)
...Hydraulic cylinder 1゜(5)...Opening/closing valve, (9)...
Pilot circuit, αυWest αD...Solenoid valve, +131
)eαt...control device. In addition, the same parts or corresponding parts in the two figures are indicated by the same reference numerals.

Claims (3)

[Claims] (1) A car supported by a hydraulic jack, a hydraulic pump connected to the hydraulic jack and driven by an electric motor, an oil tank for storing oil for the hydraulic pump, a main chamber, and a valve body connected to the main chamber. The main chamber is connected between the hydraulic jack and the hydraulic pump, and the valve body is actuated by the inflow and outflow of oil into the back chamber, and the hydraulic jack and the hydraulic pressure are connected to each other. An on-off valve that opens and closes a hydraulic flow path between the pump and the car, opens when the car goes up and down, and closes when it stops; a hydraulic inflow circuit that connects the hydraulic jack and the back chamber of the on-off valve; and a back chamber of the on-off valve. a pilot circuit consisting of a pressure oil discharge circuit that connects the chamber and the oil tank; a solenoid valve provided in the pilot circuit to open or close the pressure oil inflow circuit or the pressure oil discharge circuit; A hydraulic elevator device comprising: a control device that controls opening/closing in response to lifting/lowering and stopping of the elevator. (2) When opening the on-off valve, at the same time as closing the pressure oil inflow circuit of the pilot circuit, or after that,
2. The control device for a hydraulic elevator apparatus according to claim 1, wherein the pressure oil discharge circuit of the pilot circuit is opened. (3) When closing the on-off valve, the pressure oil inflow circuit of the pilot circuit is opened simultaneously with or after closing the pressure oil discharge circuit of the pilot circuit. A control device for a hydraulic elevator device according to item 2.