KR0146621B1 - Hydraulic elevator control device - Google Patents

Abstract

The pressure loss of the shut-off valve during the up and down operation of the hydraulic elevator is small, and the car can be stopped at a short distance even in the event of a power failure during the down operation.

When the car 2 rises, the first opening / closing valve 5 is closed, the second opening / closing valve 21 is opened, and the hydraulic oil discharged by the hydraulic pump 3 is sent to the hydraulic jack 1 to release the car 2. Raise.

At the time of descending, the second opening / closing valve 21 is closed, the first opening / closing valve 5 is opened, and the hydraulic oil of the hydraulic jack 1 is controlled by the hydraulic pump 3 and discharged to the oil tank 8.

Since the first opening / closing valve 5 is exclusively for lowering, the size of the opening can be set small regardless of the rising operation.

Since the valve body 21b of the second opening / closing valve 21 has a size corresponding to an opening corresponding to the flow rate of the pressurized oil, the valve body 21b closes quickly when the flow of the pressurized oil stops due to the power failure.

Description

Hydraulic elevator control device

1 is a hydraulic circuit diagram showing one embodiment of the first to eighth inventions of this invention;

2 is an explanatory view of operations of the second open / close valve of FIG. 1.

3 is a hydraulic circuit diagram showing a control device of a conventional hydraulic elevator,

* Explanation of symbols for main parts of the drawings

1: Hydraulic jack 2: Car

3: hydraulic pump 4: motor

5: 1st opening / closing valve 5a: valve body

6: first circuit 8: oil tank

14: control unit 21: second opening and closing valve

21b: valve body 21a: piston

21f: exhaust chamber 22: second main circuit

23: check valve 27: second solenoid valve

29: third open / close valve 29b: valve body

29c: drain room 30: third main circuit

34: 3rd solenoid valve

The present invention relates to an apparatus for controlling a hydraulic elevator by changing the rotational speed of the hydraulic pump.

3 is a hydraulic circuit diagram showing a control device of a conventional hydraulic elevator described in, for example, Japanese Patent Application Laid-Open No. 57-144971.

In the drawing, 1 is a hydraulic jack, 2 is a car supported by the hydraulic jack 1, 3 is a hydraulic pump capable of reversible rotation, 4 is an electric motor for driving the hydraulic pump 3, 5 is the main chamber 5a and the valve body 5b. An on / off valve having a main chamber 5a and an exhaust chamber 5c isolated through the main chamber 5a.

6 is a first circuit 6a connecting the hydraulic pump 3 and the main chamber 5a of the on / off valve 5 and a second circuit connecting the main chamber 5a of the on / off valve 5 and the hydraulic jack 1 ( The 6th main circuit which becomes 6b), 7 is the oil tank 8, the filter connected to the hydraulic pump 3, 9 is the pressure which connects the hydraulic jack 1 and the exhaust chamber 5c of the on-off valve 5. The pilot circuit which consists of the oil inflow circuit 9a, the pressure oil discharge circuit 9b which connects the exhaust chamber 5c of the on-off valve 5, and the oil tank 8, 10 is inserted in the pressure inflow circuit 9a. The solenoid valve whose position of a valve body when an operating force does not operate is an open position, and 11 are the solenoid valves whose position of a valve body when a operating force inserted in the hydraulic oil discharge circuit b does not operate.

12 is a variable throat valve installed in the oil pressure inlet circuit 9a, 13 is a variable throat valve installed in the oil pressure discharge circuit 9b, 14 is a solenoid valve 10, 11 and the motor 4 controlled. 15 is an opening size adjusting throttle valve for preserving the valve body 5b having a constant opening size between the full opening and closing of the on-off valve 5 during the deceleration driving of the lowering operation. An adjustment screw 15c for adjusting the size of the opening of the variable throttle valve opening to the outside is fixed to the valve body 5b, and the adjustment screw 15c is fixed between the openings of the variable throttle valve 15b between the variable throttle valves 15b. It is a sleeve that forms a size.

16 is a hydraulic oil discharge circuit connecting the variable throttle valve 15b and the oil tank 8 of the on-off valve 5, 17 is a valve body position when the operation force inserted in the hydraulic oil discharge circuit 16 is not operated. The solenoid valve 18 in a closed position is a variable throttle valve provided in the hydraulic oil discharge circuit 16.

The control device of the conventional hydraulic elevator is configured as described above and operates as follows.

First, when the rising operation command is output, the electric motor 4 is driven by the control device 14.

Thereafter, the solenoid valve 10 is operated to close the pressure oil inflow circuit 9a, and the solenoid valve 11 is then operated to open the pressure oil discharge circuit 9b.

As a result, the pressurized oil of the exhaust chamber 5c of the open / close valve 5 is discharged to the oil tank 8 so that the valve body 5b moves upward in the drawing, and the open / close valve 5 opens.

When the on-off valve 5 opens, the hydraulic oil discharged from the hydraulic pump 3 flows into the right pressure jack 1 through the first circuit 6a-> open / close valve 5-> second circuit 6b. The car 2 goes up.

Thereafter, the rotation speed of the electric motor 4 is controlled by the controller 14, and the ascending speed of the car 2 is controlled in accordance with a predetermined driving pattern.

When the car 2 arrives on the predetermined floor, the car 2 stops. When the command to close the shut-off valve 5 is output by the control device 14, the solenoid valve 11 is not operated, the hydraulic oil discharge circuit 9b is closed, and the solenoid valve 10 is not operated. The oil pressure inflow circuit 9a opens.

As a result, the valve body 5b moves downward in the drawing, and the on-off valve 5 is completely closed.

Next, when the lowering operation command is output, the solenoid valve 10 is operated by the control device 14 to close the pressure oil inflow circuit 9a, and then the solenoid valve 11 is operated so that the pressure oil discharge circuit 9b is operated. Become dog

Therefore, the pressurized oil of the exhaust chamber 5c of the on-off valve 5 is discharged to the oil tank 8, the valve body 5b moves to the upper part of the figure, and the on-off valve 5 is opened.

When the on-off valve 5 opens, the dark oil in the hydraulic jack 1 is extruded by the weight of the car 2, so that the hydraulic jack 1 → the second circuit 6b → the open / close valve 5 → the first circuit 6a. ) Is discharged to the oil tank (8) via the hydraulic pump (3) → filter (7).

Thereafter, the hydraulic pump 3 driven by the electric motor 4 by the controller 14 discharges the hydraulic oil in the hydraulic jack 1, so that the car 2 is lowered.

Since the hydraulic pump 3 is driven by the pressure in the hydraulic jack 1 generated by the weight of the car 2 and the flow rate discharged from the hydraulic jack 1, the electric motor 4 is subjected to rotation opposite to the rotational direction of the motor. It acts as a generator and turns on regenerative braking.

Therefore, by controlling the rotation speed of the electric motor 4 by the control apparatus 14, the falling speed of the car 2 is controlled according to a predetermined | prescribed driving pattern.

When the car 2 arrives on the predetermined floor, the car 2 stops.

When the command to close the shut-off valve 5 is output by the control device 14, the solenoid valve 11 is not operated, and the pressure oil discharge circuit 9b is closed and the solenoid valve 10 is not operated. The oil pressure inflow circuit 9a is opened.

As a result, the valve body 5b moves downward in the drawing, and the on-off valve 5 is completely closed.

In the control device of the conventional hydraulic elevator as described above, when the on / off valve 5 is opened during the up and down operation, when the power is cut off during operation and the motor 4 is stopped, the on / off valve 5 is completely closed. The hydraulic oil flows out from the hydraulic jack 1 through the on / off valve 5 to the oil tank 8 until now. For this reason, the car 2 descends. In order to suppress the descending speed of the car 2, it is necessary to fix the size of the opening of the on-off valve 5 small.

For this reason, in the case of ascending driving, the pressure loss when the hydraulic oil discharged from the hydraulic pump 3 passes through the opening / closing valve 5 becomes large, and the discharge pressure of the hydraulic pump 3 must be increased. ), The output power must be large, and power consumption is increased.

Moreover, in the hydraulic elevator, the car 2 may be moved by the low speed descent from an arbitrary position to an arbitrary position at the time of installation or maintenance work.

At this time, the opening / closing valve 5 is opened, regenerative braking of the electric motor 4 is performed, and the rotational speed of the hydraulic pump 3 is changed to control the discharge flow rate of the pressurized oil in the hydraulic jack 1.

At this time, when the power is cut off, the regenerative braking of the electric motor 4 becomes invalid, so that the car 2 increases and decreases while the on / off valve 5 starts to close, and then stops by closing the on / off valve 5 completely.

For this reason, when the power supply is interrupted, there is a problem in that the descending driving distance until the car 2 stops is long and dangerous.

The present invention has been made to solve the above problems to provide a control device for a hydraulic elevator to reduce the pressure loss of the on-off valve in the up and down operation, and to stop the car at a slight distance even if the power is cut off during the down operation. For the purpose of

The control device of the hydraulic elevator according to the first invention of the present invention is provided between the hydraulic jack and the hydraulic pump and opens when the car descends, and opens when the car opens and closes when the car stops. It is provided with a 2nd opening / closing valve.

In addition, the control device of the hydraulic elevator according to the second invention is a valve body and a car communicating between the hydraulic pump and the hydraulic jack with an opening size corresponding to the flow rate of the pressurized oil when the first opening / closing valve and the car ascend in the first invention. A second opening / closing valve having a piston that is engaged with the valve body when the lowering speed is lowered, and a valve communicating between the oil pump side of the second opening / closing valve and the oil tank with an opening corresponding to the flow rate of the hydraulic oil when the car lowers lowering speed; It is provided with the 3rd opening / closing valve which has a sieve.

In addition, the control device of the hydraulic elevator according to the third invention communicates between the hydraulic pump and the hydraulic jack when the first opening / closing valve of the first invention is raised and lowered, and the second opening / closing valve is closed when the car is stopped. And a third open / close valve communicating between the hydraulic pump side of the second open / close valve and the oil tank when the car lowers in low speed, and a solenoid valve connecting the exhaust chamber of the third open / close valve to the oil tank when the car lowers in low speed.

The control device of the hydraulic elevator according to the fourth invention is provided between the first open / close valve of the first invention, the second and third open / close valves of the third invention, and the hydraulic pump and the second and third open / close valves. And a check valve for permitting the flow of the pressurized oil only from the hydraulic pump to the second and third opening / closing valves.

In addition, the control device of the hydraulic elevator according to the fifth aspect of the present invention provides a first opening / closing valve of the first invention, second and third opening / closing valves of the third invention, and exhaust of the second opening / closing valve when the car descends at a low speed. It is equipped with a solenoid valve connected to an oil tank.

In addition, the control device of the hydraulic elevator according to the sixth aspect of the present invention includes a second opening and closing valve for communicating between the hydraulic pump and the hydraulic jack when the car is raised and lowered and closing when the car is stopped, and the second opening and closing valve when the car is lowered. And a third open / close valve communicating between the hydraulic pump side and the oil tank.

The control device of the hydraulic elevator according to the seventh invention includes the second solenoid valve for connecting the discharge chamber of the second opening / closing valve to the oil tank when the falling start command is input, and the falling start command is input. The third solenoid valve which connects the drainage of three open / close valves to an oil tank, and the control device which gives the said down start instruction to a 3rd solenoid valve at the time of descent of a car, and gives a descending instruction to a 2nd solenoid valve after a predetermined time.

The control device of the hydraulic elevator according to the eighth invention includes the second solenoid valve for connecting the discharge chamber of the second opening / closing valve to the oil tank when the falling stop instruction is input in the sixth invention, and the falling stop instruction is input. And a third solenoid valve for connecting the discharge valve of the third open / close valve to the oil tank, and a control device for giving a stop stop command to the second solenoid valve when the car descends and giving a stop stop command to the third solenoid valve after a predetermined time. will be.

In the first invention of the present invention, the first opening / closing valve is opened when the car descends, and the second opening / closing valve is opened when the car is raised. Therefore, the first opening / closing valve is exclusively for lowering, and is discharged from the hydraulic pump at the time of raising. The pressurized oil does not pass through the first opening / closing valve.

In the second aspect of the invention, the second opening / closing valve includes a valve body having a size corresponding to an opening corresponding to the flow rate of the hydraulic oil when the car is raised, and a piston that is engaged with the valve body when the speed is lowered. Since the on / off valve is configured to communicate between the oil pressure pump side of the second opening / closing valve and the oil tank at the size corresponding to the flow rate of the hydraulic oil when the car is lowered in speed, the second and The third open / close valve closes quickly according to the flow rate.

Further, in the third invention, the exhaust chamber of the third open / close valve is connected to the oil tank when the car is lowered in low speed, so the third open / close valve opens the flow path to the oil tank through the second open / close valve from the hydraulic jack.

In the fourth invention, since a check valve is provided between the hydraulic pump and the second and third open / close valves, the oil pressure from the hydraulic jack does not flow into the hydraulic pump when the low speed is lowered, but all flows through the third open / close valve to the oil tank. do.

In the fifth aspect of the invention, since the exhaust chamber of the second opening / closing valve is connected to the oil tank when the car is lowered at low speed, the second opening / closing valve opens the flow passage to the oil tank from the hydraulic jack through the third opening / closing valve.

In the sixth aspect of the invention, since the flow path from the hydraulic jack to the oil tank is formed through the second and third opening / closing valves, the car is lowered by its own weight when the car is lowered at low speed.

According to the seventh aspect of the present invention, when the descending start command of the car is input, the second solenoid valve connecting the exhaust chamber of the third open / close valve to the oil tank is operated, so that the second exhaust valve of the second open / close valve is connected to the oil tank after a predetermined time. Since the solenoid valve is operated, the flow rate of the pressurized oil during the low speed drop depends on the opening area of the second opening / closing valve.

In addition, according to the eighth aspect of the invention, when the descending stop command of the car is input, the operation of the second solenoid valve connecting the exhaust chamber of the second open / close valve to the oil tank is stopped, and after the predetermined time, the exhaust chamber of the third open / close valve is connected to the oil tank. Since the operation of the third solenoid valve is stopped, the flow rate of the pressurized oil during the low speed drop depends on the opening area of the second open / close valve.

EXAMPLE

1 and 2 are views showing one embodiment of the first to eighth inventions of the present invention, in which FIG. 1 is a hydraulic diagram, and FIG. 2 is an operation explanatory diagram of the second and third opening and closing valves. Like parts are denoted by the same symbols.

In FIG. 1, 21 is a 2nd opening / closing valve, and has the main chamber 21a, the valve body 21b, the exhaust chamber 21c, the compression spring 21d, the piston 21e, and the exhaust chamber 21f, and the piston 21e. Moving upwards in this figure, the valve spring 21d is engaged with the valve body 21b, and the compression spring 21d is provided between the piston 21e and the valve body 21b, and both the 21d and 21e are pressed against each other. have.

21g is a stopper for regulating the lowering position of the piston 21e.

22 is a second main circuit that connects the hydraulic pump 3, the second open / close valve 21, and the hydraulic jack 1 in order. The main chamber 21a of the hydraulic pump 3 and the second open / close valve 21 is connected. The first circuit 22a to be connected, and the second circuit 22b to connect the main chamber 21a of the second open / close valve 21 and the main chamber 5a of the first open / close valve 5 to each other. Numeral 23 is a check valve inserted into the first circuit 22a to permit the flow of pressure oil only from the hydraulic pump 3 to the second opening / closing valve 21.

24 is a pilot circuit connected to the hydraulic jack 1, the pilot circuit 21a for connecting the pilot circuit 24 and the exhaust chamber 21f of the second opening / closing valve 21, the pilot circuit 24, and the third main circuit ( 30) has a pilot circuit 24b for connecting (described later).

26 is a variable throttle valve provided in the pilot circuit 24, 27 is a solenoid valve in which the position of the valve body when the operating force inserted in the pilot circuit 24b is not closed, and 28 is installed in the pilot circuit 24b. Variable throttle valve.

29 is a 3rd opening / closing valve which has the main chamber 29a, the valve body 29b, the exhaust chamber 29c, and the compression spring 29d, and the compression spring 29d presses in the direction which always closes the valve body 29b. .

30 is a third main circuit in which the hydraulic pump 3, the third open / close valve 29 and the oil tank 8 are connected in sequence, and the first circuit 22a and the third open / close valve 29 to the second main circuit. The first circuit 30a for connecting), and the second circuit 30b for connecting the main chamber 29a of the third opening / closing valve 29 and the oil tank 8 are formed.

31 is a pilot circuit for connecting the exhaust chamber 29c of the first circuit 30a and the third open / close valve 29, 32 is a variable throttle valve installed in the pilot circuit 31, and 33 is a The pilot circuit 34 which connects the exhaust chamber 29c and the oil tank 8, 34 is a solenoid valve whose position of the valve body when the operation force inserted in the pilot circuit 33 does not operate is closed. Next, the operation of this embodiment will be described.

1. Driving up

When the rising operation command is output, the electric motor 4 is started by the control device 14, and the rotational speed thereof is controlled. As a result, the hydraulic pump 3 is driven to increase the oil pressure of the first circuit 22a of the second main circuit.

And when the pressure of the 1st circuit 22a of a 2nd main circuit wins the pressure of the 2nd circuit 22b and the force of the compression spring 21d, the valve body 21b will move, and the 2nd opening / closing valve 21 will open. The opening and the pressurized oil flow into the hydraulic jack 1 from the second circuit 22b through the main chamber 5a of the first opening / closing valve 5 and the second circuit 6b of the first main circuit.

As a result, the car 2 starts to rise, and the car 2 accelerates as the rotational speed of the electric motor 4 increases, and the car 2 is accelerated in accordance with the flow rate passing through the main chamber 21a of the second opening / closing valve 21. The size of the opening of the valve body 21b increases. When the speed of the car 2 reaches the rated speed, the rotation speed of the electric motor 4 becomes constant, and the flow rate discharged from the hydraulic pump 3 also becomes constant.

At this time, the operation of the solenoid valve 27 is stopped and the pilot circuit 24b is closed. For this reason, since the hydraulic pressure of the hydraulic jack 1 is given to the exhaust chamber 21f via the pilot circuit 24a, the piston 21e is pressed by the stopper 21g.

Further, when the car 2 is driven up and the deceleration command is output immediately before the predetermined distance of the stationary floor, the rotation speed of the electric motor 4 is decreased, whereby the car 2 is decelerated and the main chamber 21a is driven. The size of the opening of the valve body 21b decreases in accordance with the flow rate passing therethrough, and when the car 2 reaches the imaging position of the scheduled stop layer, the motor 4 starts operation after the valve body 21b is completely closed. Stop.

2. Descent operation

When the lowering driving command is output, the rotation speed of the electric motor 4 is controlled by the control device 14 to operate. As a result, the hydraulic pump 3 is driven to increase the pressure of the first circuit 6a of the first main circuit.

When it is detected by the detecting device (not shown) that this pressure is about the same as the pressure of the second circuit 6b of the first main circuit, the solenoid valve 11 is operated by the control device 14 to pressurize the oil pressure. The exit circuit 9b opens.

As a result, the pressure oil of the exhaust chamber 5c of the first opening / closing valve 5 is discharged to the oil tank 8, the valve body 5b moves, and the first opening / closing valve 5 opens. When the first opening / closing valve 5 starts to open, the hydraulic oil in the hydraulic jack 1 is extruded by the weight of the car 2 so that the hydraulic jack 1 → the first opening / closing valve 5 → hydraulic pump 3 → filter ( It is discharged to the oil tank 8 through 7).

At this time, the hydraulic pump 3 driven by the electric motor 4 by the control device 14 discharges the hydraulic oil in the hydraulic jack 1.

Since the hydraulic pump 3 is driven by the pressure in the hydraulic jack 1 generated by the weight of the car 2 and the flow rate discharged from the hydraulic jack 1, the electric motor 4 is subjected to rotation opposite to the rotational direction of the motor. It acts as a generator and turns on regenerative braking.

Therefore, by controlling the rotational speed of the electric motor 4 by the control apparatus 14, the car 2 drives down according to a predetermined | prescribed driving pattern.

When the acceleration run command of the descent operation is output to the car 2, the solenoid valve 11 is operated by the control apparatus 14, and the pressure oil discharge circuit 9b opens. Thus, if the size of the opening of the first opening / closing valve 5 is gradually increased by changing the size of the opening of the variable throttle valve 13 as the speed increases during the acceleration driving, the first opening / closing valve 5 is completely closed. You can adjust the time from to until it is fully open.

In addition, if the closing command of the first opening / closing valve 5 is output from the control device 14 immediately before the predetermined distance of the scheduled stop layer by decelerating driving in the lowering operation, the solenoid valve 11 is not operated and the hydraulic oil drainage is performed. The exit circuit 9b is closed. At the same time, the solenoid valve 17 is activated.

At this time, since the variable throttle valve 15b of the opening size adjusting throttle valve 15 is completely closed, the pressure oil discharge circuit 16 is not in communication.

As a result, when the size of the opening of the variable throttle valve 12 is changed to gradually reduce the size of the opening of the first opening / closing valve 5 as the speed decreases at the time of deceleration, the time when the first opening / closing valve 5 is closed. Can be adjusted.

As the size of the opening of the first opening / closing valve 5 gradually decreases, the sleeve 15c of the opening size adjusting throttle valve 15 follows and moves, and the variable throttle valve 15b opens gradually, and the hydraulic oil discharge circuit 16 )

The first opening / closing valve 5 when the inflow of the pressurized oil from the pressurized oil inflow circuit 9a becomes the opening size of the variable throttle valve 15b such that the inflow amount of the pressurized oil from the pressurized oil discharge circuit 16 becomes equal. Stops by opening a portion.

Since the solenoid valve 17 is not operated after that, the hydraulic oil discharge circuit 16 closes and there is no discharge of the hydraulic oil. Therefore, the hydraulic oil from the hydraulic oil inflow circuit 9a is discharged from the first opening / closing valve 5c. ) And the first opening / closing valve 5 is gradually closed and then completely closed.

3. Low speed descent

When the low speed falling command is outputted (installation, maintenance work, etc.), the solenoid valve 34 which controls the 3rd opening / closing valve 29 is operated by the control apparatus 14. As shown in FIG.

As a result, the pilot circuit 33 is opened, and the pressure oil is discharged from the exhaust chamber 29c of the third open / close valve 29 to the oil tank 8. Since the valve body 29b of the third open / close valve 29 is pressed by the compression spring 29d, the third open / close valve 29 does not open just by actuating the solenoid valve 34.

When claim that the second solenoid valve 34 at time t _1, as shown in Fig. The operation, at a time T time t ₂ after a _first to a fully open passage of the solenoid valve 34, the second opening and closing valve 21 The solenoid valve 27 to control the operation. As a result, the pilot circuits 24a and 24b open and the pressurized oil is discharged from the exhaust chamber 21c of the second opening / closing valve 21 to the third main circuit 30.

As the piston 21e moves away from the stopper 21g by the discharge of the pressure oil, the piston 21e and the valve body 21b are combined with each other to move together.

Thus, the hydraulic pressure of the hydraulic jack 1 is controlled by the hydraulic jack 1 → the first open / close valve 5 → the first circuit 22b of the second main circuit → the second open / close valve 21 → the first circuit of the third main circuit ( 30a) → discharged to the third open / close valve 29.

As a result, the valve body 29b of the third open / close valve 29 is pressed by the pressure and moves against the force of the compression spring 29d, the third open / close valve 29 opens, and the pressurized oil of the third main circuit The oil is discharged from the second circuit 30b to the oil tank 8.

At this time, the opening area of the third open / close valve 29 corresponds to the flow rate passing therethrough.

Therefore, the acceleration time can be adjusted by adjusting the opening area of the throttle valve 28.

As the second opening / closing valve 21 gradually opens, the flow rate flowing from the hydraulic jack 1 through the second opening / closing valve 21 to the third main circuit 30 increases, and the car 2 accelerates.

Next, when the low speed stop stop command is output at time t ₃ , the solenoid valve 21 is not operated, and the pressure oil is discharged from the discharge chamber 21c of the second opening / closing valve 21 to the third main circuit 30. Is stopped.

For this reason, since the hydraulic oil of the exhaust chamber 21e flows in from the hydraulic jack 1 through the pilot circuit 24a, the piston 21e and the valve body 21b move integrally, and the passage | path of the 2nd main circuit 22 is moved. Close slowly in the direction of blocking.

For this reason, the flow volume which flows from the hydraulic jack 1 through the 2nd opening / closing valve 21 to the 3rd main circuit 30 reduces, and the car 2 decelerates and runs. The stop time can be adjusted by adjusting the opening area of the throttle valve 26.

The opening area of the third open / close valve 29 corresponds to the flow rate passing therethrough, but the flow rate of the car 2 stopped at the time t ₄ and flows from the hydraulic jack 1 to the third main circuit 30 is increased. There is a slight delay T ₃ until it is completely closed even if it disappears. For this reason, the solenoid valve 34 does not operate after the time T ₂ from the time t _{3 in} which the solenoid valve 27 was not operated, for example, until the time when the third open / close valve 29 is completely closed. . Oil flowing from the oil tank 8 through the pilot circuit 33 and the pilot circuit 31 to the exhaust chamber 29c by the force of the compression spring 29d which is pressed in the direction which normally closes the valve body 29b. Since there is both oil flowing in through, the time T ₃ until the second opening / closing valve 21 is completely closed can be shortened.

Claim for having one by setting the time difference between the passages of the solenoid valve 34 to operate the solenoid valve 27 after a time T ₁ for completely opening, the second opening and closing valve 21 is opened, as shown in Figure 2. Solenoid valve Even if the opening of 34 is delayed due to electrical or mechanical factors, acceleration driving control for low-speed driving depending on the opening area of the second opening / closing valve 21 becomes possible.

For example, assuming that the second opening / closing valve 21 opens first, and the third opening / closing valve 29 opens later, the acceleration driving of the car 2 follows the opening of the third opening / closing valve 29, and the throttle valve Control at the opening size of 28 becomes impossible.

Further, as described above, the solenoid valve 34 is not operated after the time T ₂ without the solenoid valve 27 being operated, thereby accelerating the control of the low-speed driving depending on the opening area of the second opening / closing valve 21. It becomes possible.

For example, assuming that the third open / close valve 29 is closed first, the pressure around the second open / close valve 21, that is, the exhaust chamber 21f, the main chamber 21a, and the first circuit 22a of the second main circuit 21a. Since the pressures are the same, the second opening / closing valve 21 cannot be closed and stops in the open state.

From this state, when the next low-speed driving is performed, the flow of the pressurized oil occurs at the moment when the third opening / closing valve 29 opens, and the car 2 is lowered.

In addition, the hydraulic oil flowing from the hydraulic jack 1 through the second opening / closing valve 21 to the third main circuit 30 during the low speed lowering operation does not flow into the hydraulic pump 3 due to the check valve 23. It flows out through the on / off valve 29 to the oil tank 8. If flowed into the hydraulic pump 3, the flow rate is changed by the dispersion of the mechanical losses of the hydraulic pump 3, the viscosity pressure of the hydraulic oil, and the like.

The check valve 23 is to prevent this, so as to eliminate the speed change during the low speed descent operation under the influence of the hydraulic pump (3).

As described above, in the first invention of the present invention, the first opening / closing valve is opened when the car descends and the second opening / closing valve is opened when the car is raised. The opening of the first opening / closing valve of the first opening / closing valve for limiting the speed at which the car descends when the power is cut off can be reduced without accompanying pressure loss. It works.

In the second invention, the second opening / closing valve is constituted by a valve body having a size corresponding to an opening corresponding to the flow rate of the hydraulic oil when the car is raised, and a piston operating in combination with the valve body when the speed is lowered. The hydraulic pump side of the second opening / closing valve and the oil tank are communicated with each other by the size of the opening corresponding to the flow rate of the hydraulic oil when the car is falling at a low speed. Is connected to the oil tank, and in the fifth invention, the exhaust chamber of the second opening / closing valve is similarly connected to the oil tank, so that the second and third opening / closing valves are quickly changed according to the flow rate even when the power is cut off during the ascending and descending driving of the car. It has the effect of closing and stopping the car at a small distance.

In the fourth invention, a check valve is provided between the hydraulic pump and the second and third opening / closing valves, so that the hydraulic oil from the hydraulic jack does not flow into the hydraulic pump at the time of low speed drop, but passes through the third opening / closing valve to the oil tank. It flows out and is not affected by the dispersion of the mechanical losses of the hydraulic pump, the viscosity pressure of the hydraulic oil, etc., and has an effect of preventing the speed change during the low speed descent.

Further, in the sixth invention, the flow path from the hydraulic jack to the oil tank is formed through the second and third opening / closing valves, so that when the car descends at low speed, the car descends to its own weight and the car is not accelerated even if the power is cut off. It has the effect of ensuring safety by stopping at the falling distance of.

In the seventh aspect of the present invention, when the descending start command of the car is input, the second electromagnetic valve for connecting the exhaust valve of the second opening / closing valve to the oil tank is operated after a predetermined time by operating the third solenoid valve connecting the exhaust chamber of the third opening / closing valve to the oil tank. Since the valve is operated, even if the operation of the third solenoid valve is delayed, the flow rate of the pressurized oil during the low speed drop depends on the opening area of the second opening / closing valve, and the acceleration operation during the low speed drop can be controlled with high precision. .

According to the eighth aspect of the present invention, when the descending stop command of the car is input, the operation of the second solenoid valve connecting the exhaust chamber of the second open / close valve to the oil tank is stopped, and after the predetermined time, the exhaust chamber of the third open / close valve is connected to the oil tank. Since the operation of the third solenoid valve is stopped, even if the operation of the second solenoid valve is delayed, the flow rate of the pressurized oil during the low speed drop depends on the opening area of the second opening / closing valve, and it is possible to control the deceleration operation during the low speed drop with high precision. It can be effective.

Claims (8)

The hydraulic pump is driven by an electric motor to supply the hydraulic oil to the hydraulic jack, the rotational speed of the motor is controlled to change the discharge flow rate of the hydraulic pump to raise the car, discharge the hydraulic oil in the hydraulic jack to the oil tank, and increase the rotational speed of the electric motor. An elevator for lowering the car by changing the discharge flow rate of the pressurized oil by controlling the first opening / closing valve provided between the hydraulic jack and the hydraulic pump and opening when the car descends and closing when stopping the car; And a second opening / closing valve to close when stopped. The hydraulic pump is driven by the electric motor to supply the hydraulic oil to the hydraulic jack, and the rotational speed of the motor is controlled to change the discharge flow rate of the hydraulic pump to raise the car, discharge the hydraulic oil in the hydraulic jack to the oil tank, and control the rotational speed of the motor. In the elevator for lowering the car by changing the discharge flow rate of the pressure oil, the first opening and closing valve is provided between the hydraulic jack and the hydraulic pump, the opening and closing when the car is lowered and closed when stopped, and when the car is raised A second opening / closing valve having a valve body communicating between the hydraulic pump and the hydraulic jack at a size corresponding to the flow rate of the hydraulic oil, and a piston operating in conjunction with the valve body when the car descends at a low speed; And a valve body communicating between the oil pressure pump side of the second opening / closing valve and the oil tank at an opening size corresponding to the flow rate of the pressure oil. The control apparatus for a hydraulic elevator, characterized in that it includes a third on-off valve. The hydraulic pump is driven by an electric motor to supply the hydraulic oil to the hydraulic jack, the rotational speed of the motor is controlled to change the discharge flow rate of the hydraulic pump to raise the car, discharge the hydraulic oil in the hydraulic jack to the oil tank, and increase the rotational speed of the electric motor. An elevator for lowering the car by changing the discharge flow rate of the pressurized oil by controlling the first opening / closing valve, provided between the hydraulic jack and the hydraulic pump, opening when the car descends, closing when the car descends, and when the car descends. A second opening / closing valve which communicates between the hydraulic pump and the hydraulic jack when the car is raised and lowered and closes when the car is stopped, and an opening corresponding to the flow rate of the hydraulic oil when the car is low speed lowered. A third opening / closing valve having a valve body communicating between the hydraulic pump side and the oil tank and a discharge chamber of the third opening / closing valve when the car lowers at a low speed; A hydraulic elevator control device comprising a solenoid valve connected to an oil tank. The hydraulic pump is driven by an electric motor to supply the hydraulic oil to the hydraulic jack, the rotational speed of the motor is controlled to change the discharge flow rate of the hydraulic pump to raise the car, discharge the hydraulic oil in the hydraulic jack to the oil tank, and increase the rotational speed of the electric motor. An elevator for lowering the car by changing the discharge flow rate of the pressurized oil by controlling, wherein the first opening / closing valve is installed between the hydraulic jack and the hydraulic pump and opens when the car descends and closes when raised and stopped. A second opening / closing valve which communicates between the hydraulic pump and the hydraulic jack at the time of starting and lowering, and closes when the car is stopped, and the hydraulic pump side of the second opening / closing valve and the oil tank when the car is low speed lowered. A three-opening valve, between the hydraulic pump and the second and third opening / closing valves, from the hydraulic pump to the second and third opening / closing valves. Control apparatus for a hydraulic elevator, characterized in that it includes a check valve for allowing the pressure oil to flow. The hydraulic pump is driven by an electric motor to supply the hydraulic oil to the hydraulic jack, the rotational speed of the motor is controlled to change the discharge flow rate of the hydraulic pump to raise the car, discharge the hydraulic oil in the hydraulic jack to the oil tank, and increase the rotational speed of the electric motor. An elevator for lowering the car by changing the discharge flow rate of the pressurized oil by controlling the first opening / closing valve, which is installed between the hydraulic jack and the hydraulic pump and opens when the car descends and closes when it is raised and stopped. A second opening / closing valve communicating between the hydraulic pump and the hydraulic jack when ascending and closing when the car is stopped, and a third opening / closing valve communicating between the hydraulic pump side of the second opening / closing valve and the oil tank when the car is low speed lowered. And an electromagnetic valve for connecting the exhaust chamber of the second opening / closing valve to the oil tank when the car descends at a low speed. Controller of the data. In an elevator for supplying hydraulic oil to a hydraulic jack to raise a car supported by the hydraulic jack to discharge the hydraulic oil in the hydraulic jack to an oil tank to lower the car, the hydraulic pump and the hydraulic jack communicate with each other when the car is raised and lowered. And a second open / close valve that closes when the car stops, and a third open / close valve communicating between an oil tank and the hydraulic pump side of the second open / close valve when the car descends. An elevator for supplying hydraulic oil to a hydraulic jack to raise a car supported by the hydraulic jack to discharge the hydraulic oil in the hydraulic jack to an oil tank to lower the car, wherein the elevator communicates between the hydraulic pump and the hydraulic jack when the car is raised and at a low speed. A second open / close valve, a second open / close valve which communicates between the oil pump of the second open / close valve and the oil tank of the second open / close valve when the lower start command is input; And a third solenoid valve for connecting the discharge chamber of the third opening / closing valve to the oil tank when the lowering start command is input, and giving the lowering starting command to the third solenoid valve when the car descends. 2. A control device for a hydraulic elevator, comprising: a control device for giving the lowering command to the solenoid valve. In an elevator for supplying hydraulic oil to a hydraulic jack to raise a car supported by the hydraulic jack to discharge the hydraulic oil in the hydraulic jack to an oil tank to lower the car, the hydraulic pump and the hydraulic jack communicate with each other when the car is raised and at a low speed. When the second opening / closing valve closed and the stop stop command are inputted when the car is stopped, the second solenoid valve connecting the discharge chamber of the second opening / closing valve to the oil tank and the hydraulic pump side of the second opening / closing valve are connected to the oil tank. A third solenoid valve to communicate with, a third solenoid valve connecting the discharge chamber of the third open / close valve to the oil tank when the lower stop command is input, and the lower stop command to the second solenoid valve when the car descends; And a control device for giving the lower stop instruction to the third solenoid valve after a predetermined time.