JPH0733359A - Hydraulic elevator device - Google Patents

Abstract

PURPOSE:To provide a hydraulic elevator device capable of supporting a car in a hoistway and easily lowering only the plunger of a hydraulic jack. CONSTITUTION:When a car 2 is supported in a hoistway and the plunger 1a of a hydraulic jack 1 alone is lowered, the third opening/closing valve 24 is opened by an opening means 24f, and the second opening/closing valve 19 is opened like for the low-speed descent operation of the car 2. An oil path capable of discharging the pressure oil from the hydraulic jack 1 to an oil tank 8 with the small pressure by the weight of the plunger la alone is formed. Such a trouble can be resolved that the discharge of the pressure oil in the hydraulic jack 1 becomes difficult due to the flow resistance of a hydraulic pump 3 and the descent of the plunger 1a alone is hindered.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention controls the number of revolutions of a hydraulic pump to perform an ascending operation, and at the time of a descending operation, the electric motor is operated by a braking operation by rotating the hydraulic pump by pressure oil discharged from a hydraulic jack. The present invention relates to a hydraulic elevator device.

[0002]

2. Description of the Related Art FIG. 3 shows, for example, Japanese Utility Model Laid-Open No. 57-14497.
It is a hydraulic circuit diagram which shows the conventional hydraulic elevator apparatus similar to what was shown by the 1st publication. In the figure, (1) is a hydraulic jack having a plunger (1a), (2) is a basket provided at the upper end of the plunger (1a), (3) is a reversibly rotatable hydraulic pump, and (4) is a hydraulic pump ( It is an electric motor that drives 3). (5) is a first opening / closing valve, which is composed of a main chamber (5a) and a back chamber (5c) separated from the main chamber (5a) by a valve body (5b).
a) is connected to a second circuit to be described later that connects the hydraulic jack (1) and the hydraulic pump (3), and the valve body (5b) is operated by the inflow and outflow of the pressure oil in the back chamber (5c), thereby increasing the oil pressure. Open and close the hydraulic circuit described below between the jack (1) and hydraulic pump (3) to
Open when (2) is down and close when car (2) is stopped.

Reference numeral (6) is a hydraulic circuit in which the hydraulic jack (1), the first opening / closing valve (5) and the hydraulic pump (3) are sequentially connected, and between the first opening / closing valve (5) and the hydraulic pump (3). The first circuit (6a) and the second circuit (6b) between the hydraulic jack (1) and the first on-off valve (5). (7) is a filter provided at the tip of the pipeline between the hydraulic pump (3) and the oil tank (8), and (9) is a pilot circuit, which is the back of the hydraulic jack (1) and the first on-off valve (5). The pressure oil inflow circuit (9a) connecting to the chamber (5c) and the back chamber (5c) of the first on-off valve (5)
And an oil tank (8) are connected to each other, and a sub-pressure oil discharge circuit (9c) is connected to the oil tank (8) and a variable throttle of an opening adjustment throttle described later.

(10) is a normally open solenoid valve of the normally open type which is provided in the pressure oil inflow circuit (9a) to open and close the pressure oil inflow circuit (9a), and (11) is provided in the pressure oil discharge circuit (9b) It is a normally closed solenoid valve that is normally closed to open and close the pressure oil discharge circuit (9b). (12) is the pressure oil inflow circuit
Inflow variable throttle valve provided in (9a), (13) pressure oil discharge circuit
Discharge variable throttle valve provided in (9b), (14) is a normally open solenoid valve (1
0), normally closed solenoid valve (11), electric motor driving hydraulic pump (3)
(4) and a control device for controlling a sub-normally closed solenoid valve described later.

(15) is an opening adjustment throttle which allows the first opening / closing valve (5) to be held at a predetermined opening between fully opened and closed during deceleration running of the car (2) A sleeve (15b) whose position with respect to the fixed portion is adjusted by the screw (15a) and the adjusting screw (15a) to form the opening degree of the variable throttle hole (15c).
It is composed by. (16) is a sub normally closed solenoid valve provided in the sub pressure oil discharge circuit (9c), (17) is between the sub normally closed solenoid valve (16) of the sub pressure oil discharge circuit (9c) and the oil tank (8) It is a variable adjustment diaphragm provided in the.

The conventional hydraulic elevator system is constructed as described above, and the car (2) is operated to rise as described below. That is, when a rising operation command is issued, the control device (14) energizes the electric motor (4), then energizes the normally open solenoid valve (10) to close the pressure oil inflow circuit (9a), and then the normal operation. Closed solenoid valve
(11) is energized and the pressure oil discharge circuit (9b) opens. As a result, the pressure oil in the back chamber (5c) of the first opening / closing valve (5) is discharged to the oil tank (8), and the first opening / closing valve (5) opens. When the first opening / closing valve (5) opens, the pressure oil discharged from the hydraulic pump (3) is
From (5) flows into the hydraulic jack (1), the car (2) rises,
The rotation speed of the electric motor (4) is controlled by the control device (14), and the car (2) is operated to rise according to a predetermined operation pattern.

When the car (2) reaches the target floor, the control device (14) issues a closing command for the first on-off valve (5) so that the pressure oil discharge circuit (9b) is always provided. Closed solenoid valve (11)
Is de-energized, the pressure oil discharge circuit (9b) is closed, and the pressure oil inflow circuit (9b)
The normally open solenoid valve (10) provided in a) is deenergized to open the pressure oil inflow circuit (9a). As a result, the pressure oil flows into the back chamber (5c) of the first opening / closing valve (5) and the first opening / closing valve (5) is fully closed.
(2) stops.

The lowering operation of the car (2) is performed as follows. That is, when a descending operation command is issued, the control device
The normally open solenoid valve (10) is energized by (14) and the pressure oil inflow circuit (9
The circuit a) is closed, and then the normally closed solenoid valve (11) is energized to open the pressure oil discharge circuit (9b). As a result, the pressure oil in the back chamber (5c) of the first opening / closing valve (5) is discharged to the oil tank (8), and the first opening / closing valve (5) opens. Hydraulic jack (1) when the first on-off valve (5) opens
The pressure oil inside is pushed out by the weight of the car (2) and discharged to the oil tank (8) via the hydraulic jack (1), the first opening / closing valve (5), the hydraulic pump (3) and the filter (7). .

Next, the hydraulic jack (3) is driven by the hydraulic pump (3) driven by the electric motor (4) according to a command from the control device (14).
The pressure oil in (1) is discharged. The hydraulic pump (3) is driven by the pressure inside the hydraulic jack (1) due to the own weight of the car (2) and the flow rate of the pressure oil discharged from the hydraulic jack (1). Then, the rotation speed of the electric motor (4) connected to the hydraulic pump (3) during the dynamic braking operation is controlled, and the car (2) descends according to a predetermined operation pattern.

When the car (2) reaches the target floor, the control device (14) issues a closing command for the first on-off valve (5) so that the pressure oil discharge circuit (9b) is normally provided. Closed solenoid valve (11)
Is de-energized, the pressure oil discharge circuit (9b) is closed, and the pressure oil inflow circuit (9b)
The normally open solenoid valve (10) provided in a) is deenergized to open the pressure oil inflow circuit (9a). As a result, the pressure oil flows into the back chamber (5c) of the first opening / closing valve (5) and the first opening / closing valve (5) is fully closed.
(2) stops.

[0011]

In the conventional hydraulic elevator system as described above, the car (2) is supported on the fixed part of the hoistway of the hydraulic elevator system during the installation work and the maintenance work, and the hydraulic jack (1 In some cases, only the plunger (1a) is lowered by disconnecting it from the plunger (1a). At this time, the pressure oil in the hydraulic jack (1) will support the weight of only the plunger (1a), so the pressure in the hydraulic jack (1) will be compared when supporting the car (2). And become smaller. Therefore, it is difficult to discharge the pressure oil in the hydraulic jack (1) due to the flow resistance of the hydraulic pump (3) and the lowering of only the plunger (1a) of the hydraulic jack (1) is obstructed. There was a point.

The present invention has been made to solve the above problems, and a hydraulic elevator in which only a plunger of a hydraulic jack can be easily lowered by supporting a car on a fixed portion of a hoistway during maintenance work or the like. The purpose is to obtain the device.

[0013]

SUMMARY OF THE INVENTION In a hydraulic elevator system according to a first aspect of the present invention, a basket supported by a hydraulic jack, a hydraulic pump connected to the hydraulic jack via a hydraulic circuit, and The hydraulic pump is driven to control the rotation speed to change the discharge flow rate of the hydraulic pump to raise the car, and the rotation speed is controlled to change the rotation speed of the hydraulic pump to change the pressure oil discharge flow rate in the hydraulic jack. An electric motor for controlling the car to move down, a third opening / closing valve for normally closing the hydraulic flow path between the hydraulic jack and the oil tank connected to this hydraulic jack, and a second opening / closing provided in the hydraulic circuit. Opening control of the valve when the car rises, closing control when the car stops, and closing control of the first on-off valve provided in the hydraulic circuit in parallel with the second on-off valve when the car stops,
A control device that simultaneously controls the opening of the second opening / closing valve and the third opening / closing valve during the low speed descent operation of the car to lower the car by its own weight, and opens the third opening / closing valve against the force in the direction of closing the third opening / closing valve. And an opening means for communicating the hydraulic flow path.

In the hydraulic elevator apparatus according to the second aspect of the present invention, the car supported by the hydraulic jack, the hydraulic pump connected to the hydraulic jack via the hydraulic circuit, and the hydraulic pump are driven. The speed of the hydraulic pump is controlled to change the discharge flow rate of the hydraulic pump to raise the car, and the speed of the hydraulic pump is changed to change the speed of the hydraulic pump to control the pressure oil discharge flow rate in the hydraulic jack. The third opening / closing valve for fully closing the hydraulic flow path between the electric motor for lowering the engine, the hydraulic jack, and the oil tank connected to this hydraulic jack, and the second opening / closing valve provided in the hydraulic circuit for the car. When the car is stopped, the opening control is performed when the car is stopped, and the closing control is performed. When the car is stopped, the first on-off valve provided in the hydraulic circuit in parallel with the second on-off valve is controlled to be closed. Two A control device for self-weight lower the car and opened simultaneously controls the closing and the third on-off valve, the third operation of the third on-off valve of the valve body engaged with the valve body is restricted to a predetermined range
Restricting means for adjusting the opening degree of the third opening / closing valve so as to open the third opening / closing valve so as to communicate with the hydraulic flow path, by opposition to either one of the force in the direction of closing the opening / closing valve and the force in the direction of opening Is provided.

[0015]

In the hydraulic elevator apparatus according to the first aspect of the present invention configured as described above, when only the plunger of the hydraulic jack is lowered, the third opening / closing valve is opened by the opening means, and the cage is opened. The second on-off valve is opened as in the low speed descent operation. As a result, an oil passage is formed that allows the pressure oil to be discharged from the hydraulic jack to the oil tank even with a small pressure due to the weight of the plunger alone.

Further, in the hydraulic elevator apparatus according to the second aspect of the present invention configured as described above, when only the plunger of the hydraulic jack is lowered, it opposes the force in the direction of closing the third opening / closing valve. Then, the opening degree of the third opening / closing valve can be adjusted, or the opening degree of the third opening / closing valve can be adjusted by a regulating means that can adjust the opening degree of the third opening / closing valve to open the third opening / closing valve. The second on-off valve is opened as in the low speed descent operation of the car. As a result, an oil passage is formed that allows the pressure oil to be discharged from the hydraulic jack to the oil tank even with a small pressure due to the weight of the plunger alone.

[0017]

【Example】

Example 1. FIG. 1 is a hydraulic circuit diagram showing an embodiment of the present invention. In the figure, (1) is a hydraulic jack having a plunger (1a), (2) is a basket provided at the upper end of the plunger (1a), (3) is a reversibly rotatable hydraulic pump, and (4) is a hydraulic pump ( It is an electric motor that drives 3). (5) is the first on-off valve,
Back chamber separated from main chamber (5a) by main chamber (5a) and valve body (5b)
(5c), the main chamber (5a) is connected to a second circuit (to be described later) that connects the hydraulic jack (1) and the hydraulic pump (3),
When the valve body (5b) operates due to the inflow and outflow of pressure oil in the back chamber (5c), the hydraulic circuit (described later) between the hydraulic jack (1) and the hydraulic pump (3) is opened and closed, and the car (2) Open when is down and close when car (2) is stopped.

Reference numeral (6) is a hydraulic circuit in which the hydraulic jack (1), the first opening / closing valve (5) and the hydraulic pump (3) are sequentially connected, and between the first opening / closing valve (5) and the hydraulic pump (3). The first circuit (6a) and the second circuit (6b) between the hydraulic jack (1) and the first on-off valve (5). (7) is a filter provided at the tip of the pipeline between the hydraulic pump (3) and the oil tank (8), and (9) is a pilot circuit, which is the back of the hydraulic jack (1) and the first on-off valve (5). A pressure oil inflow circuit (9a) that connects the chamber (5c), a pressure oil discharge circuit (9b) that connects the back chamber (5c) of the first opening / closing valve (5) and the oil tank (8), and the opening degree described later. It is composed of an auxiliary pressure oil discharge circuit (9c) that connects the variable throttle of the adjustment throttle and the oil tank (8).

(10) is a normally open solenoid valve of the normally open type which is provided in the pressure oil inflow circuit (9a) to open and close the pressure oil inflow circuit (9a), and (11) is provided in the pressure oil discharge circuit (9b) It is a normally closed solenoid valve that is normally closed to open and close the pressure oil discharge circuit (9b). (12) is the pressure oil inflow circuit
Inflow variable throttle valve provided in (9a), (13) pressure oil discharge circuit
Discharge variable throttle valve provided in (9b), (14) is a normally open solenoid valve (1
0), normally closed solenoid valve (11), electric motor driving hydraulic pump (3)
(4) A control device for controlling the above.

(15) is an opening adjustment throttle which allows the first opening / closing valve (5) to be held at a predetermined opening between fully opened and closed during deceleration running of the car (2) Screw (15a),
Variable diaphragm composed of sleeve (15b) and opening (15b) adjusted by adjusting screw (15a)
It consists of (15c). (16) is a sub normally closed solenoid valve provided in the sub pressure oil discharge circuit (9c), (17) is between the sub normally closed solenoid valve (16) of the sub pressure oil discharge circuit (9c) and the oil tank (8) It is a variable adjustment diaphragm provided in the. (18) is a hydraulic passage in which a hydraulic pump (3), a second opening / closing valve (to be described later), and a hydraulic jack (1) are sequentially connected.
It is composed of an on-off valve (5), a first passage (18a) on the side of the second on-off valve, a second on-off valve and a second passage (18b) on the side of a hydraulic flow passage which will be described later.

(19) is a second on-off valve, which is a main chamber (19a) and a valve body (19
Back room (19c), main room (19a) separated from main room (19a) by b)
And the back chamber (19c) are connected to each other (19d), the piston (19e) that is fitted to the valve body (19b) to form the back chamber (19c), the piston (19
e) and the sub-back chamber formed by the valve body (19b) side of the main chamber (19a)
(19f), located in the back chamber (19c) and from the piston (19e) to the valve body
It is composed of a push spring (19g) for pressing (19b) and a stopper (19h) of a piston (19e) provided in the main chamber (19a). The second on-off valve (19) opens when pressure oil flows from the hydraulic pump (3) to the hydraulic jack (1), and
The push spring (19g) presses the valve body (19b) in a direction projecting from the piston (19e).

Reference numeral (20) is a hydraulic flow path for sequentially connecting the hydraulic pump (3), a third opening / closing valve described later and an oil tank (8), and the second opening / closing valve.
(19) and the first flow path (20a) on the side of the third opening / closing valve, and the third flow path (20b) on the side of the third opening / closing valve and the oil tank (8). (2
1) is a pilot circuit, which is a hydraulic jack (1) and a second on-off valve
The first pilot oil passage (21a) between the sub back chamber (19f) of (19) and the second pilot oil between the sub back chamber (19f) of the second opening / closing valve (19) and the hydraulic flow passage (20). It is composed of a road (21b). (twenty two)
Is a normally closed solenoid valve of the normally closed type provided in the second pilot oil passage (21b) of the pilot circuit (21). (23a) is a throttle provided in the first pilot oil passage (21a) for adjusting the inflow amount of the pressure oil from the hydraulic jack (1) to the sub back chamber (19f) of the second opening / closing valve (19).

Reference numeral (23b) is a throttle provided in the second pilot oil passage (21b) for adjusting the outflow amount of the pressure oil from the auxiliary back chamber (19f) of the second opening / closing valve (19). (24) is the third on-off valve,
Main chamber (24a), valve body (24b), back chamber (24c) separated from main chamber (24a) by valve body (24b), valve body (24b) located in back chamber (24c)
A pressing spring (24d) that presses in the closing direction, a base part is screwed into the peripheral wall of the back chamber (24c), and an opening direction stop (24e) and a main chamber that prevent the opening direction displacement of the valve body (24b) at a predetermined position. The base portion is screwed into the peripheral wall of (24a) and is constituted by an opening means (24f) including a closing direction blocking element for blocking the closing direction displacement of the valve body (24b) at a predetermined position.

The main chamber (24a) of the third on-off valve (24) is provided in the hydraulic passage (20) between the hydraulic pump (3) and the oil tank (8),
The hydraulic flow passage (20) is opened and closed by operating the valve body (24b) by the inflow and outflow of pressure oil in the back chamber (24c). (25) is the hydraulic flow path (2
0) is connected to the back chamber (24c) of the third opening / closing valve (24), and (26) is a throttle provided in the pilot circuit (25). (27) is a pilot circuit that connects the back chamber (24c) of the third opening / closing valve (24) and the oil tank (8), and the normally closed solenoid valve of the back chamber (24c) of the third opening / closing valve (24) 1st pilot oilway between (28) (2
7a) and the second pilot oil passage (27b) between the normally closed solenoid valve (28) and the oil tank (8). (29) is the hydraulic flow path (2
(0) is a non-return valve that prevents pressure oil from flowing in the opposite direction although pressure oil flows from the hydraulic pump (3) to the second on-off valve (19) and the third on-off valve (24). It is a valve.

In the hydraulic elevator system constructed as described above, the car (2) is operated to rise as described below. That is, when a rising operation command is issued from the operation control device (not shown) of the hydraulic elevator device, the control device (1
The electric motor (4) is energized by 4) and the rotation speed is controlled to rotate. Then, the hydraulic pump (3) is driven and the hydraulic pressure in the first passage (18a) of the hydraulic passage (18) rises via the hydraulic passage (20),
When the pressure in the first passage (18a) overcomes the pressure in the second passage (18b) of the hydraulic passage (18) and the pushing force of the pushing spring (19g) of the second opening / closing valve (19), the second opening / closing valve ( The valve body (19b) of 19) opens.
As a result, pressure oil flows into the hydraulic jack (1) through the main chamber (5a) of the first opening / closing valve (5) and the car (2) starts to rise.
At this time, since the first opening / closing valve (5) does not flow out the pressure oil in the back chamber (5c), the valve body (5b) does not operate.

Then, as the rotation speed of the electric motor (4) increases, the raising of the car (2) is accelerated, and the valve body (19) of the second opening / closing valve (19) is increased.
The opening of the valve element (19b) gradually increases as the flow rate of the pressure oil passing through b) increases. When the speed of the car (2) reaches the rated value, the rotation speed of the electric motor (4) becomes constant and the hydraulic pump (3)
The flow rate of the pressure oil discharged from the tank is also constant. Then, when the car (2) reaches a predetermined distance before the target floor to stop after the deceleration traveling of the ascending operation starts, a deceleration command is issued from the control device (14), and the rotation speed of the electric motor (4) gradually decreases. Along with this, the car (2) gradually decelerates and rises.

Further, as the rotation speed of the electric motor (4) gradually decreases, the flow rate of the pressure oil passing through the valve body (19b) of the second opening / closing valve (19) decreases and the valve body (19b) opens. The degree gradually decreases. Then, when the car (2) reaches the target floor of the stop, the valve body (19b) of the second opening / closing valve (19) is fully closed, and thereafter the electric motor (4) is deenergized.

The lowering operation of the car (2) is performed as described below. That is, when a descending operation command is issued from the operation control device (not shown) of the hydraulic elevator device, the control device (14) energizes the electric motor (4) to control the rotation speed to rotate the hydraulic pump (3). As a result, the pressure of the pressure oil in the first circuit (6a) of the hydraulic circuit (6) rises. And the first circuit (6a)
It is detected by a detection device (not shown) that the pressure of the pressure oil of 1 is almost the same as the pressure of the pressure oil of the second circuit (6b) of the hydraulic circuit (6).

By this detection, the control device (14) causes the normally open solenoid valve (10) of the pressure oil inflow circuit (9a) of the pilot circuit (9).
Is energized to close the pressure oil inflow circuit (9a), and then the normally closed solenoid valve (11) is energized to open the pressure oil discharge circuit (9b) of the pilot circuit (9). As a result, the pressure oil in the back chamber (5c) of the first opening / closing valve (5) is discharged to the oil tank (8), and the valve body (5b) of the first opening / closing valve (5) operates to operate the first opening / closing valve ( 5) opens. And
When the opening of the first opening / closing valve (5) starts, the pressure oil in the hydraulic jack (1) is pushed out by the weight of the car (2), and the hydraulic jack
It is discharged to the oil tank (8) through (1), the first on-off valve (5), the hydraulic pump (3) and the filter (7).

At this time, the pressure oil in the hydraulic jack (1) is discharged through the operation of the hydraulic pump (3) driven by the electric motor (4) by the control device (14), and is generated by the weight of the car (2). The hydraulic pump (3) is driven by the pressure inside the hydraulic jack (1) and the flow rate of the pressure oil discharged from the hydraulic jack (1). For this reason, the electric motor (4) connected to the hydraulic pump (3) is operated by dynamic braking, so that the electric motor (4) is controlled by the control device (14).
The rotation speed of (4) is controlled and the car (2) descends according to a predetermined operation pattern.

Next, when the acceleration of the descending operation of the car (2) is commanded, the pressure oil in the back chamber (5c) of the first opening / closing valve (5) flows out, and the valve body (5b) is moved to the fully open position. It moves and the descent operation of the car (2) is accelerated to increase the speed. Along with this, the first on-off valve
Pressure oil discharge circuit (9b) to gradually increase the opening of (5)
The variable discharge throttling valve (13) provided in the is changed. This makes it possible to adjust the time from when the first opening / closing valve (5) is fully closed to when it is fully opened.

Further, when the car (2) arrives at a predetermined distance before the target floor of the stop after the deceleration operation of the descending operation is started, the control device (14) issues a closing command of the first opening / closing valve (5), and the pilot The normally closed solenoid valve (11) provided in the pressure oil discharge circuit (9b) of the circuit (9) is deenergized to close the pressure oil discharge circuit (9b). Then, the normally open solenoid valve (10) of the pressure oil inflow circuit (9a) is deenergized to open the pressure oil inflow circuit (9a). Further, the normally closed solenoid valve (11) is deenergized, and at the same time, the sub normally closed solenoid valve (16) is deenergized. At this time, since the variable throttle (15c) of the opening adjustment throttle (15) is fully closed, the auxiliary pressure oil discharge circuit (9c) is closed.

The pressure oil inflow circuit (9a) is provided so that the opening degree of the first opening / closing valve (5) is gradually decreased as the speed decreases due to the start of deceleration running of the car (2). By changing the opening of the inflow variable throttle valve (12)
The closing time of the on-off valve (5) can be adjusted. As the opening of the first opening / closing valve (5) gradually decreases, the sleeve (15b) of the opening adjusting throttle (15) follows and moves, the variable throttle (15c) gradually opens, and the auxiliary pressure oil The discharge circuit (9c) opens.

Then, the opening adjustment throttle (15) is variable so that the inflow amount of the pressure oil from the pressure oil inflow circuit (9a) matches the discharge amount of the pressure oil from the auxiliary pressure oil discharge circuit (9c). When the opening of the throttle (15c) is reached, the first opening / closing valve (5) stops at the partial opening.
After that, the sub-normally closed electromagnetic valve (16) is deenergized to close the sub-pressure oil discharge circuit (9c), and the amount of pressure oil discharged is lost. Therefore, the pressure oil from the pressure oil inflow circuit (9a) flows through the first opening / closing valve (5).
Flowing into the back chamber (5c), the first on-off valve (5) is gradually closed and then fully closed.

In addition, the basket (2) is normally the hydraulic jack (1).
When the low speed operation descending traveling command is issued while being supported by the normally closed electromagnetic valve (28), the normally closed solenoid valve (28) for controlling the third opening / closing valve (24) is energized. As a result, the third circuit through the pilot circuit (27)
Pressure oil is discharged from the back chamber (24c) of the on-off valve (24) to the oil tank (8). If the normally closed solenoid valve (28) is just energized,
The opening / closing valve (24) does not open because the valve body (24b) is pressed by the pressing spring (24d). Then, after the passage of the normally closed electromagnetic valve (28) is completely opened, the normally closed electromagnetic valve (22) for controlling the second on-off valve (19) is energized. This allows the pilot circuit (21)
Through the second pilot oil passage (21b) and throttle (23b) of the second
Since the piston (19e) moves away from the stopper (19h) by discharging the pressure oil from the auxiliary back chamber (19f) of the on-off valve (19) to the hydraulic flow path (20), the piston (19e) and the valve body (19b) are moved. ) Is displaced as a unit.

As a result, the pressure oil in the hydraulic jack (1) flows through the hydraulic passage (18), the second opening / closing valve (19) and the hydraulic passage (20). And the valve body (24b) of the third on-off valve (24)
Is pushed by the pressure oil and overcomes the force of the push spring (24d) to move and open. The opening area of the third opening / closing valve (24) at this time corresponds to the flow rate of the pressure oil passing through. Therefore, by adjusting the opening area of the diaphragm (23b), it is possible to adjust the acceleration time in the low speed operation descending traveling. And the second on-off valve
By gradually opening (19), the flow rate of the pressure oil flowing from the hydraulic jack (1) through the second opening / closing valve (19) to the hydraulic flow path (20) increases, and the car (2) accelerates and descends. .

Then, when a low speed operation stop command for descending traveling is issued, a normally closed solenoid valve (22) for controlling the second opening / closing valve (19).
Is deactivated. As a result, the auxiliary back chamber (1) of the second opening / closing valve (19)
The pressure oil is no longer discharged from the hydraulic passage (20) to the second opening / closing valve (19) from the hydraulic jack (1) through the first pilot oil passage (21a) and the throttle (23a) of the pilot circuit (21). ) Sub back room
Pressure oil flows into (19f). Therefore, the piston (19e) and the valve body (19b) move integrally and gradually close in the direction of blocking the passage of the hydraulic passage (18). Then, the flow rate from the hydraulic jack (1) through the second opening / closing valve (19) to the hydraulic flow path (20) is reduced, and the car (2) is decelerated. By adjusting the opening area of the aperture (23a), it is possible to adjust the stop time in the low speed operation descending traveling.

The opening area of the third opening / closing valve (24) corresponds to the flow rate of the pressure oil passing through, but the car (2) stops and the hydraulic jack (1) moves to the hydraulic flow path (20). Even if there is no flow, there will be some delay before it is fully closed. Therefore, after a lapse of time until the third opening / closing valve (24) is fully closed, for example, after a lapse of a predetermined time after deactivating the normally closed solenoid valve (22), the normally closed solenoid valve (28) of the pilot circuit (27) is ). As a result, the pressure oil flowing from the oil tank (8) into the back chamber (24c) through the pilot circuit (27) when the normally closed solenoid valve (28) is energized, and the back chamber (through the pilot circuit (25) ( Since there is both pressure oil flowing into 24c), the valve body (2
The force of the push spring (24d) that constantly presses 4b) in the direction of normally closing the second on-off valve (19) causes the third on-off valve (2
It is possible to shorten the time until 4) is fully closed, and prevent the hydraulic circuit from malfunctioning.

Next, at the time of installation and maintenance of the hydraulic elevator device, the car (2) supported by the plunger (1a) of the hydraulic jack (1) is detached and supported by the fixed body of the hoistway, and the plunger is moved by the low speed descent operation. The operation when only (1a) is lowered will be described. That is, although not shown in the drawing, the cage
By pinching the guide rail of the car (2) with the safety device of (2), the car (2) is fixed at a proper position in the hoistway and the car (2) is separated from the plunger (1a). In this state, the position of the opening means (24f) consisting of the closing valve of the third opening / closing valve (24) is manually adjusted, and the closing direction operation of the third opening / closing valve (24) by the force of the push spring (24d). The third on-off valve (24) is held in the open state by preventing it from closing beyond a predetermined position against the pressure.

In this state, when a low speed operation descent command is issued, a normally closed solenoid valve for controlling the third opening / closing valve (24).
(28) is activated. As a result, the pressure oil is discharged from the back chamber (24c) of the third opening / closing valve (24) to the oil tank (8) through the pilot circuit (27). When the normally closed solenoid valve (28) is energized, the pressure acting on the back chamber (24c) disappears.
Since the valve body (24b) of (24) is pressed in the closing direction by the push spring (24d), the valve body (24b) is held in a state of hitting the opening means (24f). Then, after the passage of the normally closed electromagnetic valve (28) is completely opened, the normally closed electromagnetic valve (22) for controlling the second opening / closing valve (19) is energized.

As a result, the second opening / closing valve (19) is passed through the first pilot oil passage (21a) and the throttle (23a) of the pilot circuit (21).
By discharging the pressure oil from the sub back chamber (19f) to the hydraulic circuit (20), the piston (19e) is displaced away from the stopper (19h). Therefore, the piston (19e) moves together with the valve body (19b). As a result, the pressure oil of the hydraulic jack (1) flows through the passage of the hydraulic passage (18) to the hydraulic passage (20) through the second opening / closing valve (19). The pressure flowing through the hydraulic passage (20) is smaller than that when the hydraulic jack (1) normally supports the car (2). However, the valve body (24b) of the third on-off valve (24)
Is held and opened in a state of hitting the opening means (24f), the pressure oil flowing in the hydraulic flow path (20) flows out to the oil tank (8) with a small resistance.

Also, in this state, the opening time of the diaphragm (23a) can be adjusted to adjust the acceleration time in the low speed operation descending traveling. Then, the second on-off valve (19) gradually opens so that the hydraulic jack (1) moves to the second on-off valve (19).
The flow rate of the pressure oil flowing through the hydraulic passage (20) and the oil tank (8) increases, and the plunger (1a) accelerates and descends. Then, when the low speed operation command for descending traveling is issued, the second opening / closing valve (19)
The normally closed solenoid valve (22) that controls the valve is deenergized. This allows
The pressure oil is no longer discharged from the auxiliary back chamber (19f) of the second opening / closing valve (19) to the hydraulic passage (20), and the first pilot oil passage (21a) of the pilot circuit (21) from the hydraulic jack (1). The pressure oil flows into the sub back chamber (19f) of the second opening / closing valve (19) through the throttle (23a). Therefore, the piston (19e) and the valve body (19b) move integrally and gradually close in the direction of blocking the passage of the hydraulic passage (18).

Therefore, the flow rate of the pressure oil flowing from the hydraulic jack (1) through the second opening / closing valve (19) to the hydraulic passage (20) is reduced, and the plunger (1a) decelerates. Also, aperture (23a)
It is possible to adjust the stop time in the low speed operation descending traveling by adjusting the opening area of the. Then, the second on-off valve (19) is fully closed and there is no pressure oil flowing from the hydraulic jack (1) to the oil tank (8), so that the plunger (1a) is prevented from descending. After that, the position of the opening means (24f) is adjusted manually to move backward to a position where it does not hit the valve body (24b). As a result, the normally closed solenoid valve (28) is energized by the force of the push spring (24d) that presses the valve body (24b) in the direction in which it is normally closed, and by the subsequent operation of the hydraulic elevator device. Pressure oil flowing from the oil tank (8) into the back chamber (24c) through the pilot circuit (27) and the back chamber (24) through the pilot circuit (25).
The third on-off valve (24) is fully closed because there is both pressure oil flowing into c).

Thus, during installation work and maintenance work of the hydraulic elevator system, the car (2) is supported by the fixed part of the hydraulic elevator system hoistway and separated from the plunger (1a) of the hydraulic jack (1) to remove the plunger. When only (1a) is to be lowered, the third opening / closing valve (24) is opened by the opening means (24f), and the second opening / closing valve (19) is opened in the same manner as the low speed descent operation of the car (2). . This forms an oil passage through which the pressure oil can be discharged from the hydraulic jack (1) to the oil tank (8) even with a small pressure due to the weight of only the plunger (1a). Therefore,
Eliminates the problem that pressure oil in the hydraulic jack (1) becomes difficult to discharge due to the flow resistance of the hydraulic pump (3) and the lowering of only the plunger (1a) of the hydraulic jack (1) is obstructed. Therefore, the work efficiency such as installation can be improved.

Example 2. FIG. 2 is an enlarged cross-sectional view of an essential part of the third on-off valve of FIG. 1 showing another embodiment of the present invention, and is configured similarly to FIG. 1 except for FIG. In the figure, (20b) is a second flow path of the hydraulic flow path (20), (24) is a third opening / closing valve, and the main chamber (24a), the valve body (24b), and the valve body (24b) are connected to the main chamber ( twenty four
a) a back chamber (24c) isolated from the back chamber (24c)
The push spring (24d) and the valve disc (24d) that press the (24b) in the closing direction.
It is composed of a blocking element (30) for blocking the displacement of b) at a predetermined position.

The base of the blocker (30) is screwed into the wall of the back chamber (24c), and the large diameter portion (24g) is formed at the tip of the block, and the recessed portion is provided on the opposing valve body (24b) surface. A space is formed at (24h) and they are fitted together. (24i) is a retaining ring fitted near the opening of the recess (24h) provided on the surface of the valve body (24b), and is a blocking element.
The large diameter part (24g) of (30) is prevented from departing from the recess (24h).
The valve body (31) is composed of a blocking element (30), a large diameter portion (24g), a recess (24h) provided on the valve body (24b) surface, and a retaining ring (24i).
It is a regulation means for regulating the movement of (24b) within a predetermined range. (2
7) is a pilot circuit that connects the back chamber (24c) of the third opening / closing valve (24) and the oil tank (8).

In the hydraulic elevator device constructed as described above, the large diameter portion (24g) of the blocking element (30) is the valve body (24b).
The restricting means (31) is configured by being fitted into the concave portion (24h) provided on the surface. As a result, the restricting means (31) becomes the valve body (24b).
To regulate the movement of the valve element (24b) in the normal operation direction within a predetermined range. Then, a mechanism capable of adjusting the opening degree of the third opening / closing valve (24) is configured to oppose the force in the direction of fully closing the third opening / closing valve (24). Along with this, a mechanism that can adjust the opening degree of the third opening / closing valve (24) is formed against the force in the direction of fully opening the third opening / closing valve (24). For this reason, the restricting means (31) may use a blocking element that determines the position of the third opening / closing valve (24) in the opening direction and a blocking element that determines the position of the third opening / closing valve (24) in the closing direction. it can.

As a result, the following operation can be obtained. That is, the pilot circuit (27) between the oil tank (8) and the back chamber (24c) of the third opening / closing valve (24) provided between the hydraulic pump (3) and the oil tank (8) is in a normal state. Then a fully closed normally closed solenoid valve
Provide (28). Before the hydraulic pump (3) is operated by energizing the electric motor (4) when the temperature in the oil passage of the hydraulic circuit (6) etc. drops below a predetermined value, the normally closed solenoid valve (28 ) To allow pressure oil to flow. As a result, when pressure oil is discharged from the back chamber (24c) of the third opening / closing valve (24), the valve body
(24b) moves by the dimension L shown in FIG. 2 and hits the large diameter portion (24g) of the restricting means (31) to maintain the opening.

In this state, when the temperature in the oil passage such as the hydraulic circuit (6) falls below a predetermined value, the electric motor (4)
To operate the hydraulic pump (3), flow the pressure oil into the oil tank (8) through the third opening / closing valve (24), and apply the frictional heat generated by the pressure loss at that time to the pressure oil. It is possible to raise the oil temperature.

During installation and maintenance of the hydraulic elevator system, the car (2) supported by the plunger (1a) of the hydraulic jack (1) is detached and fixed to the fixed part of the hoistway, and the plunger ( When only 1a) is lowered, it can be operated as described below. That is, although not shown in the figure, the car is equipped with the emergency stop device for the car (2).
By pinching the guide rail of (2), the car (2) is fixed at a proper position in the hoistway. In this state, the obstruction element (30) of the restriction means (31) of the third on-off valve (24) is manually operated by a screw to move the large diameter portion (24g) by a dimension M shown in FIG. Apply to 24i). Then, the force of the push spring (24d) causes the third on-off valve (24).
The valve element (2) of the third on-off valve (24)
Make sure that 4b) does not close beyond the specified position.

As a result, the plunger (1a) is lowered in the embodiment of FIG.
The pressure oil can be discharged from the hydraulic jack (1) to the oil tank (8) even with a small pressure due to the weight of only (1a). Therefore, due to the flow resistance of the hydraulic pump (3) etc., the hydraulic jack
(1) It is possible to solve the problem that the pressure oil in the inside becomes difficult to discharge and the lowering of only the plunger (1a) of the hydraulic jack (1) is obstructed, and the work efficiency of installation etc. can be improved. .

As another embodiment of the present invention, a car supported by a hydraulic jack, a hydraulic pump connected to the hydraulic jack via a hydraulic circuit, and a hydraulic pump driven to control the number of revolutions of the hydraulic pump. An electric motor that drives the car upward by changing the discharge flow rate of the pump, controls the rotation speed and changes the rotation speed of the hydraulic pump to control the pressure oil discharge flow rate in the hydraulic jack, and lowers the car. Occasionally, a third opening / closing valve that fully closes the hydraulic flow path between the hydraulic jack and the oil tank connected to this hydraulic jack, and a second opening / closing valve provided in the hydraulic circuit are used for opening control. When the car is stopped, the first on-off valve provided in the hydraulic circuit in parallel with the second on-off valve is controlled to be closed when the car is stopped, and the second on-off valve and the third on-off valve are operated during the low-speed descent operation of the car. Control the aperture simultaneously The control device for lowering the car by its own weight and the third opening / closing valve against the force in the direction of being engaged with the valve body of the third opening / closing valve to restrict the operation of the valve body within a predetermined range and closing the third opening / closing valve. And a regulating means for adjusting the opening degree, adjusting the opening degree of the third opening / closing valve against the force in the direction of opening the third opening / closing valve, and opening the third opening / closing valve to communicate the hydraulic flow path. It is conceivable that the

As a result, when only the plunger of the hydraulic jack is lowered, the opening degree of the third opening / closing valve can be adjusted against the force in the direction of closing the third opening / closing valve, and the opening degree of the third opening / closing valve can be adjusted. The third opening / closing valve is opened by the restricting means capable of adjusting the opening degree of the third opening / closing valve against the force in the opening direction, and the second opening / closing valve is opened similarly to the low speed descent operation of the car. As a result, an oil passage is formed that allows the pressure oil to be discharged from the hydraulic jack to the oil tank even with a small pressure due to the weight of only the plunger. Therefore, it is difficult to discharge the pressure oil in the hydraulic jack due to the flow resistance of the hydraulic pump, and the problem that the lowering of only the plunger of the hydraulic jack is obstructed is solved and the work efficiency of installation etc. is improved. You can

Further, when the temperature in the oil passage of the hydraulic circuit or the like drops and falls below a predetermined value, a normally closed solenoid valve provided in the pilot circuit between the back chamber of the third opening / closing valve and the oil tank is used. Open to allow pressure oil to flow out. As a result, when pressure oil is discharged from the back chamber of the third opening / closing valve, the valve body moves and the restricting means holds the opening degree of the third opening / closing valve due to the pressure oil pressure. Then, by energizing the electric motor and operating the hydraulic pump, the pressure oil is circulated through the third opening / closing valve to the oil tank, and the friction heat generated due to the pressure loss can increase the temperature of the pressure oil. be able to.

As another embodiment of the present invention, a basket supported by a hydraulic jack, a hydraulic pump connected to the hydraulic jack via a hydraulic circuit, and a hydraulic pump driven to control the number of revolutions of the hydraulic pump. An electric motor that drives the car upward by changing the discharge flow rate of the pump, controls the rotation speed and changes the rotation speed of the hydraulic pump to control the pressure oil discharge flow rate in the hydraulic jack, and lowers the car. Occasionally, a third opening / closing valve that fully closes the hydraulic flow path between the hydraulic jack and the oil tank connected to this hydraulic jack, and a second opening / closing valve provided in the hydraulic circuit are used for opening control. When the car is stopped, the first on-off valve provided in the hydraulic circuit in parallel with the second on-off valve is controlled to be closed when the car is stopped, and the second on-off valve and the third on-off valve are operated during the low-speed descent operation of the car. Control the aperture simultaneously The control device for lowering the car by its own weight and the third opening / closing valve against the force in the direction of being engaged with the valve body of the third opening / closing valve to restrict the operation of the valve body within a predetermined range and closing the third opening / closing valve. The opening can be adjusted, and the third opening / closing valve is opened by manual operation when the plunger of the hydraulic jack alone is being lowered, and the hydraulic flow path is in communication so that the plunger can be opened through the opening of the second opening / closing valve in the same way as during low-speed lowering operation. It is conceivable that a means for restricting only the weight of the chisel is provided.

As a result, when only the plunger of the hydraulic jack is lowered, the third opening / closing valve opening is controlled by the regulating means against the force in the direction of closing the third opening / closing valve by the manual operation. The on-off valve is opened, and the second on-off valve is opened as in the low speed descent operation of the car. As a result, an oil passage that allows the pressure oil to be discharged from the hydraulic jack to the oil tank is formed even with a small pressure due to the weight of only the plunger, and only the plunger descends by its own weight. Therefore, it is difficult to discharge the pressure oil in the hydraulic jack due to the flow resistance of the hydraulic pump, and the problem that the lowering of only the plunger of the hydraulic jack is obstructed is solved and the work efficiency of installation etc. is improved. You can

[0057]

As described above, the invention according to claim 1 of the present invention includes a basket supported by a hydraulic jack and a hydraulic pump connected to the hydraulic jack through a hydraulic circuit.
Driving this hydraulic pump, the rotation speed is controlled to change the discharge flow rate of the hydraulic pump to raise the car, and the rotation speed is controlled to change the rotation speed of the hydraulic pump to discharge the pressure oil in the hydraulic jack. And a third opening / closing valve that fully closes the hydraulic flow path between the hydraulic jack and the oil tank connected to the hydraulic jack, in order to lower the car.
The second on-off valve provided in the hydraulic circuit controls the opening when the car rises and controls the closing when the car stops. The first on-off valve provided in the hydraulic circuit in parallel with the second on-off valve stops the car. At the same time, the closing control is performed to control the opening and closing of the second and third opening and closing valves at the same time during the low speed descent operation of the car to lower the weight of the car by its own weight, and to counter the force in the direction of closing the third opening and closing valve. The opening means for opening the third opening / closing valve and communicating the hydraulic passage are provided.

As a result, when only the plunger of the hydraulic jack is lowered, the third opening / closing valve is opened by the opening means, and the second opening / closing valve is opened as in the low speed descent operation of the car. Then, an oil passage is formed that allows the pressure oil to be discharged from the hydraulic jack to the oil tank even with a small pressure due to the weight of only the plunger. Therefore, it is difficult to discharge the pressure oil in the hydraulic jack due to the flow resistance of the hydraulic pump, and the problem that the lowering of only the plunger of the hydraulic jack is obstructed is solved and the work efficiency of installation etc. is improved. There is.

Further, as described above, the invention according to claim 2 of the present invention includes a cage supported by the hydraulic jack,
A hydraulic pump connected to a hydraulic jack via a hydraulic circuit, and driving this hydraulic pump to control the rotation speed to change the discharge flow rate of the hydraulic pump to raise the car, and to control the rotation speed to control the hydraulic pump. Of the electric motor that controls the hydraulic oil discharge flow rate in the hydraulic jack to lower the car by changing the number of rotations of the hydraulic jack, and normally closes the hydraulic flow path between the hydraulic jack and the oil tank connected to this hydraulic jack. A third opening / closing valve for controlling the opening and closing of the second opening / closing valve provided in the hydraulic circuit when the car is raised and a closing control when the car is stopped, and a third opening / closing valve provided in the hydraulic circuit and arranged in parallel with the second opening / closing valve. 1 The on-off valve is controlled to close when the car is stopped, and the second
A control device for simultaneously controlling the opening and closing of the opening / closing valve and the third opening / closing valve to lower the weight of the car by itself, and engaging the valve body of the third opening / closing valve to regulate the operation of the valve body within a predetermined range to close the third opening / closing valve. A means for regulating the opening of the third opening / closing valve to oppose either one of the force in the opening direction and the force in the opening direction, and to provide a restricting means for opening the third opening / closing valve to communicate the hydraulic flow path. Is.

As a result, when only the plunger of the hydraulic jack is lowered, the third opening / closing valve is opened by the restricting means, and the second opening / closing valve is opened as in the low speed descent operation of the car. As a result, an oil passage is formed that allows the pressure oil to be discharged from the hydraulic jack to the oil tank even with a small pressure due to the weight of only the plunger. Therefore, it is difficult to discharge the pressure oil in the hydraulic jack due to the flow resistance of the hydraulic pump, and the problem that the lowering of only the plunger of the hydraulic jack is obstructed is solved and the work efficiency of installation etc. is improved. There is.

[Brief description of drawings]

FIG. 1 is a hydraulic circuit diagram showing a first embodiment of the present invention.

FIG. 2 is a view showing Embodiment 2 of the present invention and is an enlarged cross-sectional view corresponding to an enlarged main part of the third opening / closing valve of FIG. 1 described above.

FIG. 3 is a hydraulic circuit diagram showing a conventional hydraulic elevator device.

[Explanation of symbols]

 1 hydraulic jack 1a plunger 2 basket 3 hydraulic pump 4 electric motor 5 first opening / closing valve 6 hydraulic circuit 8 oil tank 14 controller 19 second opening / closing valve 20 hydraulic passage 24 third opening / closing valve 24b valve body 24f opening means 31 regulating means

[Procedure amendment]

[Submission date] September 8, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 1

[Correction method] Change

[Correction content]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 2

[Correction method] Change

[Correction content]

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction content]

[0009] system hydraulic fluid in the hydraulic jack (1) is discharged by the hydraulic pump (3) driven by an electric motor (4) by a command of the control device (14). The hydraulic pump (3) is driven by the pressure inside the hydraulic jack (1) due to the own weight of the car (2) and the flow rate of the pressure oil discharged from the hydraulic jack (1). Then, the rotation speed of the electric motor (4) connected to the hydraulic pump (3) during the dynamic braking operation is controlled, and the car (2) descends according to a predetermined operation pattern.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction content]

[0013]

SUMMARY OF THE INVENTION In a hydraulic elevator system according to a first aspect of the present invention, a basket supported by a hydraulic jack, a hydraulic pump connected to the hydraulic jack via a hydraulic circuit, and The hydraulic pump is driven to control the rotation speed to change the discharge flow rate of the hydraulic pump to raise the car, and the rotation speed is controlled to change the rotation speed of the hydraulic pump to change the pressure oil discharge flow rate in the hydraulic jack. controlling a motor that lowering driving basket, hydraulic port in normal
Pump and a third opening / closing valve that fully closes the hydraulic flow path between the oil tank connected to this hydraulic pump and the second opening / closing valve provided in the hydraulic circuit.
The opening / closing valve controls the opening when the car rises and controls the closing when the car stops. The first opening / closing valve provided in the hydraulic circuit in parallel with the second opening / closing valve controls the closing of the car when the car stops. A control device that simultaneously controls the opening of the second opening / closing valve and the third opening / closing valve during low speed descent to lower the car by its own weight, and a hydraulic device that opens the third opening / closing valve against the force in the direction of closing the third opening / closing valve. An opening means for connecting the flow paths is provided.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0035

[Correction method] Change

[Correction content]

In addition, the basket (2) is normally the hydraulic jack (1).
When the low speed operation descending traveling command is issued while being supported by the normally closed electromagnetic valve (28), the normally closed solenoid valve (28) for controlling the third opening / closing valve (24) is energized. As a result, the third circuit through the pilot circuit (27)
Pressure oil is discharged from the back chamber (24c) of the on-off valve (24) to the oil tank (8) . Its to the normally closed electromagnetic valve for controlling the second on-off valve (19) after the passage of the normally closed electromagnetic valve (28) is fully opened (22) is energized. As a result, pressure oil is discharged from the auxiliary back chamber (19f) of the second opening / closing valve (19) to the hydraulic passage (20) through the second pilot oil passage (21b) and the throttle (23b) of the pilot circuit (21). By doing so, the piston (19e) moves away from the stopper (19h), so that the piston (19e) and the valve body (19b) are integrally displaced.

[Procedure correction 6]

[Document name to be amended] Statement

[Name of item to be corrected] 0057

[Correction method] Change

[Correction content]

[0057]

As described above, the invention according to claim 1 of the present invention includes a basket supported by a hydraulic jack and a hydraulic pump connected to the hydraulic jack through a hydraulic circuit.
This hydraulic pump is driven to control the rotation speed to change the discharge flow rate of the hydraulic pump to raise the car, and the rotation speed is controlled to change the rotation speed of the hydraulic pump to discharge the pressure oil in the hydraulic jack. And a third opening / closing valve that fully closes the hydraulic flow path between the hydraulic jack and the oil tank connected to the hydraulic jack, in order to lower the car.
The second on-off valve provided in the hydraulic circuit controls the opening when the car rises and controls the closing when the car stops. The first on-off valve provided in the hydraulic circuit in parallel with the second on-off valve stops the car. sometimes and closed port, and a control device for self-weight lower the car and opened simultaneously controls the second on-off valve and a third on-off valve during low-speed descent operation of the car, against the direction of the force that closes the third on-off valve The opening means for opening the third opening / closing valve and communicating the hydraulic passage are provided.

Claims (2)

[Claims] 1. A hydraulic pump supported by a hydraulic jack, a hydraulic pump connected to the hydraulic jack via a hydraulic circuit, and a number of revolutions controlled by driving the hydraulic pump to change a discharge flow rate of the hydraulic pump. The electric car to raise the car to control the rotational speed of the hydraulic pump to change the rotational speed of the hydraulic pump to control the pressure oil discharge flow rate in the hydraulic jack to lower the car. A third opening / closing valve that fully closes the hydraulic flow path between the jack and the oil tank connected to this hydraulic jack, and a second opening / closing valve provided in the hydraulic circuit are used to control the opening of the car when the car is raised. When the car is stopped, the closing control is performed, and the first opening / closing valve provided in the hydraulic circuit in parallel with the second opening / closing valve is controlled to be closed when the car is stopped, and the second opening / closing is performed during the low speed descent operation of the car. Valve and number A control device that simultaneously controls the opening and closing of the three opening / closing valves to lower the weight of the car by itself, and an opening that opens the third opening / closing valve to communicate with the hydraulic flow path against the force in the direction of closing the third opening / closing valve. And a hydraulic elevator device having means. 2. A hydraulic pump supported by a hydraulic jack, a hydraulic pump connected to the hydraulic jack via a hydraulic circuit, and the number of revolutions controlled by driving the hydraulic pump to change the discharge flow rate of the hydraulic pump. The electric car to raise the car to control the rotational speed of the hydraulic pump to change the rotational speed of the hydraulic pump to control the pressure oil discharge flow rate in the hydraulic jack to lower the car. A third opening / closing valve that fully closes the hydraulic flow path between the jack and the oil tank connected to this hydraulic jack, and a second opening / closing valve provided in the hydraulic circuit are used to control the opening of the car when the car is raised. When the car is stopped, the closing control is performed, and the first opening / closing valve provided in the hydraulic circuit in parallel with the second opening / closing valve is controlled to be closed when the car is stopped, and the second opening / closing is performed during the low speed descent operation of the car. Valve and number A control device that simultaneously controls the opening and closing of the three opening / closing valves to lower the car by its own weight, and is engaged with the valve element of the third opening / closing valve to restrict the operation of the valve element within a predetermined range to close the third opening / closing valve. A restriction means for adjusting the opening degree of the third opening / closing valve to open the third opening / closing valve so as to communicate with the hydraulic flow path, by opposition to either one of the force in the opening direction and the force in the opening direction. Equipped with hydraulic elevator device.