JPH08231145A - Control unit of hydraulic elevator - Google Patents

Abstract

PURPOSE: To enable stable traveling control at all times by installing a flow control valve regulating an oil quantity in time of descending operation of a hydraulic elevator, in an interval between a hydraulic jack and a hydraulic pump. CONSTITUTION: At the time of driving a hydraulic elevator lifting a car 2 through a hydraulic jack 3, a controller 13, in time of ascending operation of this elevator, controls an inverter unit 10 in conformity with a control command value formed on the basis of each detection signal out of a revolution detector 12 and a speed detector 11 so as to make the car 2 liftable at the specified speed pattern, and thereby a three-phase induction motor 4 is controlled for its variable speed. On the other hand, at the time of descending operation of this elevator, a control command value performing valve opening control over a flow control valve 9 is generated in conformity with a detection signal out of the speed detector 11. In addition, when pressure in a hydraulic pump 6 and that in the hydraulic jack 3 have become almost equal, the control command value controlling a check valve 7 for its opening is outputted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for a hydraulic elevator, and in particular, is capable of always performing stable traveling control with a minimum required configuration without being affected by variations in hydraulic equipment. The present invention relates to a control device for a hydraulic elevator.

[0002]

2. Description of the Related Art Generally, a hydraulic elevator is driven by a hydraulic jack that raises and lowers a car via a plunger and a three-phase induction motor, and supplies pressure oil from a hydraulic tank to the hydraulic jack when moving the car up and down. It is composed of a hydraulic pump for discharging.

Conventionally, as a control system for controlling the speed of a car of a hydraulic elevator of this type, a flow rate control system and a rotational speed control system of a hydraulic pump have been mainly used.

First, in the flow rate control system, when the car of the hydraulic elevator is rising, the electric motor for driving the hydraulic pump is rotated at a constant speed, and the constant discharge amount supplied from the hydraulic pump to the hydraulic cylinder of the hydraulic jack. The oil is returned to the hydraulic tank, and when an elevator start command is issued, the amount of oil returned from the hydraulic cylinder to the hydraulic tank is adjusted by the flow rate control valve, thereby controlling the speed of the car.

When the car of the hydraulic elevator is descending, the flow rate control valve regulates the amount of oil in the hydraulic cylinder that flows back to the tank due to the weight of the car. Control.

The flow rate control valve in this case controls the current value given to the flow rate control valve from the speed control device, so that the flow rate control valve outputs oil of a flow rate corresponding to the current value. As described above, the flow rate control method is a method of controlling the speed of the elevator by the oil flow rate.

On the other hand, the rotational speed control system of the hydraulic pump controls the flow rate of oil by controlling the rotational speed of the hydraulic pump by performing inverter control to operate the AC electric motor at a variable speed, thereby controlling the hydraulic elevator. This is a method of controlling the speed of the car.

However, first, in the above-described flow rate control system, when the load pressure (hydraulic pressure) of the hydraulic elevator or the oil temperature changes, the viscosity of the oil changes and the volumetric efficiency of the hydraulic pump decreases, so the car However, there is a problem that the traveling pattern of is separated from a predetermined one.

As a result, there is a problem in that it is not possible to accurately stop at the target floor when landing on the elevator. Therefore, in order to solve such a problem, the speed of the car of the hydraulic elevator is fed back, and the valve control current, which is a speed control command value, is proportional-integral-derivative (PID) controlled according to the deviation from the speed reference. A method of doing so has been proposed, and thereby the running characteristics have become stable.

However, if the temperature or pressure of the oil changes, the system characteristics of the hydraulic elevator to be controlled will fluctuate significantly, so it is necessary to output the control amount most suitable for the current situation.

That is, when the proportional-integral-derivative control is performed by the speed control feedback control, it is necessary to tune each parameter of the proportional-integral-derivative so that the riding comfort and running performance of the elevator are optimized.
Then, in order to reduce the tuning of this parameter, a change in the characteristic is dealt with by using a parameter for each temperature and pressure.

However, in order to perform the two adjustments of tracking the target value and suppressing the disturbance due to variations in the characteristics of hydraulic equipment and the continuation of natural vibration, the parameter has only one degree of freedom, which makes adjustment difficult. Has become.

Particularly, regarding the ascending operation of the hydraulic elevator, there is a problem that the selection of the control parameter value for each temperature and pressure and the disturbance suppression are more susceptible to the variation of the hydraulic equipment than the case of the descending operation. .

Further, the ascending operation of the hydraulic elevator has a problem that energy loss is large because the electric motor is operated at a constant rotation until the car starts and stops.

On the other hand, in the rotational speed control system of the hydraulic pump described above, the reversing mode is set because the electric motor reverses during the descent operation of the hydraulic elevator, and the electric motor serves as a generator.

As a result, it is necessary to provide a power regeneration device or a resistance regeneration device as a device for converting or consuming power in the regeneration mode, and the use of the inverter device makes the configuration more complicated than the current system. In addition, there is a problem that the device is added to further increase the complexity of the configuration.

[0017]

As described above, in the conventional hydraulic elevator control system, it is easy to be affected by variations in hydraulic equipment, and the device configuration becomes complicated, so that stable running characteristics cannot be obtained. There was a problem.

An object of the present invention is to provide a control device for a hydraulic elevator, which is capable of always performing stable traveling control with a minimum required configuration without being affected by variations in hydraulic equipment and the like. .

[0019]

In order to achieve the above object, first, in the invention corresponding to claim 1, a hydraulic jack for raising and lowering a car through a plunger and a car driven by an electric motor are used. Installed between the hydraulic pump that supplies and discharges pressure oil from the hydraulic tank to the hydraulic jack when moving up and down, the inverter device that controls the variable speed of the electric motor during the rising operation of the hydraulic elevator, and the hydraulic jack and the hydraulic pump. And a flow rate control valve for adjusting the amount of oil during the descent operation of the hydraulic elevator.

In the invention according to claim 2, a hydraulic jack for raising and lowering the car through the plunger,
Driven by an electric motor, a hydraulic pump that supplies / discharges pressure oil from the hydraulic tank to the hydraulic jack when moving up and down the car, a check valve installed between the hydraulic pump and the hydraulic tank, and a hydraulic elevator lift It is provided with an inverter device that performs variable speed control of the electric motor during operation, and a flow rate control valve that is installed between the hydraulic jack and the hydraulic pump and that adjusts the amount of oil during downward operation of the hydraulic elevator.

On the other hand, in the invention corresponding to claim 3, a hydraulic jack for raising and lowering the car through the plunger,
A hydraulic pump that is driven by an electric motor and supplies / discharges pressure oil from the hydraulic tank to the hydraulic jack when moving up and down the car, and a flow control valve that is installed between the hydraulic jack and the hydraulic pump and that adjusts the amount of oil. In the control device for the hydraulic elevator, the inverter device for driving the electric motor, the speed detecting means for detecting the speed of the cage of the hydraulic elevator, the rotational speed detecting means for detecting the rotational speed of the electric motor, and the hydraulic elevator During the ascending operation of the hydraulic elevator, the inverter device is driven to control the variable speed of the electric motor based on the detection signals from the rotation speed detection means and the speed detection means so that the car can move up and down in a predetermined speed pattern. The speed control command value to be generated is generated, and during the descent operation of the hydraulic elevator, the valve opening control of the flow control valve is performed based on the detection signal from the speed detection means. Comprising a control means for generating a speed control instruction value output to perform.

In the invention according to claim 4, a hydraulic jack for raising and lowering the car through the plunger,
A hydraulic pump that is driven by an electric motor and supplies / discharges pressure oil from the hydraulic tank to the hydraulic jack when moving up and down the car, and a flow control valve that is installed between the hydraulic jack and the hydraulic pump and that adjusts the amount of oil. A hydraulic elevator control device including a check valve installed between a hydraulic pump and a hydraulic tank, an inverter device for driving an electric motor, and a speed detecting means for detecting a speed of a car of the hydraulic elevator. , Rotation speed detection means for detecting the rotation speed of the electric motor, and each detection from the rotation speed detection means and the speed detection means during the ascending operation of the hydraulic elevator so that the car of the hydraulic elevator can move up and down in a predetermined speed pattern. Based on the signal, it generates a speed control command value that drives the inverter device to control the variable speed of the electric motor. Based on the detection signal from the means, and a control means for generating and outputting a speed control command value for performing the valve opening control of the flow control valve.

Here, in particular, as the above-mentioned control means, based on the operation command section which outputs an operation command by the operation sequence of the ascending or descending operation of the hydraulic elevator, and the respective detection signals from the rotation speed detecting means and the speed detecting means. , A speed control command for controlling the valve opening of the flow rate control valve based on a detection signal from a motor speed control unit that generates a speed control command value for performing variable speed control of the motor and outputs the speed control command value to the inverter device. Depending on the valve opening speed control unit that generates a value and outputs it to the flow control valve, and either the motor speed control unit or the valve opening speed control unit depending on the up or down operation command output from the operation command unit. It is preferable that the speed control switching command unit outputs a switching command for switching the speed control of the car by switching.

[0024]

Therefore, first, in the control device for a hydraulic elevator according to the first and third aspects of the invention, the control means uses the control method according to the ascending or descending operation of the hydraulic elevator, and the inverter during the ascending operation. The speed control is performed by the variable speed control of the electric motor, which is advantageous for running performance and energy saving by using the device, and the speed control is performed by the control panel device and the flow control valve, which is excellent in simplification of control, during the down operation. Switch to do it.

Thus, during the ascending operation, the speed of the electric motor and the car speed are fed back, and the speed can be controlled with high accuracy by the variable speed control of the inverter device. Also, during the descent operation, the car speed is fed back, the speed is controlled by controlling the valve opening of the flow control valve, and it is not necessary to reversely rotate the electric motor for driving the hydraulic pump. Does not exist, and a device (power supply regenerating device or resistance regenerating device) for converting or consuming electric power in the regenerative mode, which was necessary when using the inverter control during the descent operation, can be eliminated.

As a result, the control device can be realized with the minimum configuration of the system by switching the control method during the ascending or descending operation of the hydraulic elevator, and during the ascending operation, energy saving is achieved by using the electric motor variable speed control. And at the time of descending operation,
By using the valve opening control of the flow rate control valve, it is possible to reduce the cost by eliminating the need for a power regeneration device or a resistance regeneration device that is required during inverter control.

On the other hand, in the control device for the hydraulic elevator according to the second and fourth aspects of the invention, by installing a check valve between the hydraulic pump and the hydraulic tank,
In addition to the actions described above, the pressure inside the hydraulic pump and the pressure inside the hydraulic jack are always the same, so there is no need to perform pressure adjustment that was necessary when starting the hydraulic elevator.
The pressure sensor may be provided only on the hydraulic jack side, and the system can be constructed with a further minimum configuration.

[0028]

Embodiments of the present invention will now be described in detail with reference to the drawings. (First Embodiment) FIG. 1 is a system configuration diagram showing a control device for a hydraulic elevator according to this embodiment.

Referring to FIG. 1, a hydraulic elevator includes a hydraulic jack 3 for raising and lowering a car 2 via a plunger 1.
Between the hydraulic jack 3 and the hydraulic pump 6, which is driven by the three-phase induction motor 4 and supplies / discharges pressure oil from the hydraulic tank 5 to the hydraulic jack 3 when moving up and down the car 2. Check valve 8 installed via hydraulic pipe 7
And a flow control valve 9 installed between the hydraulic pump 6 and the check valve 8 for adjusting the amount of oil.

On the other hand, the control device is the inverter device 10.
, Speed detector 11, rotation speed detector 12, and controller 1
And 3. Here, the inverter device 10
Is for driving the three-phase induction motor 4.

The speed detector 11 is provided in the car 2 of the hydraulic elevator and detects the speed of the car 2. Further, the rotation speed detector 12 is provided in the three-phase induction motor 4 and detects the rotation speed thereof.

Furthermore, the controller 13 controls the rotation speed detector 12 during the ascending operation of the hydraulic elevator so that the car 2 of the hydraulic elevator can move up and down in a predetermined speed pattern.
Based on the detection signals from the speed detector 11 and the speed detector 11, a control command value for driving the inverter device 10 to perform variable speed control of the three-phase induction motor 4 is generated, and speed detection is performed during the descent operation of the hydraulic elevator. A control command value for controlling the valve opening of the flow control valve 9 is generated based on the detection signal from the container 11,
Further, when the pressure of the hydraulic pump 6 and the pressure in the hydraulic jack 3 become substantially equal, a control command value for controlling the opening of the check valve 7 is output.

FIG. 2 is a functional block diagram showing a detailed configuration example of the controller 13. That is, the controller 13 operates as shown in FIG.
As shown in, the operation command unit 21 and the motor speed control unit 2
2, a valve opening speed control unit 23, and a speed control switching command unit 24.

Here, the operation command section 21 outputs an operation command according to the operation sequence of the ascending or descending operation of the hydraulic elevator. In addition, the motor speed control unit 22
Is to generate a speed control command value for performing variable speed control of the three-phase induction motor 4 based on the detection signals from the rotation speed detector 12 and the speed detector 11, and output the speed control command value to the inverter device 10.

Further, the valve opening speed control unit 23 generates a speed control command value for controlling the valve opening of the flow rate control valve 9 based on the detection signal from the speed detector 11, and causes the flow rate control valve 9 to perform the control. It is what is output.

Furthermore, the speed control switching command unit 24
Is a switch for selectively switching the speed control of the car by selectively switching to either the motor speed control unit 22 or the valve opening speed control unit 23 in accordance with the ascending or descending operation command output from the operation command unit 21. It outputs a command.

Next, a control method in the control device for the hydraulic elevator according to the present embodiment having the above-mentioned structure will be described. (A) Ascending operation of hydraulic elevator (see FIG. 3A) When the car 2 of the hydraulic elevator is stopped, the electromagnetic switching valve of the check valve 8 is closed.

In this state, when a command for ascending operation is output from the operation command section 21, the speed control switching command section 24 switches the operation logic to speed control by the three-phase induction motor 4, and the motor speed control is performed. An operation command is input to the unit 22.

Then, in the motor speed control unit 22, the car speed pattern generation unit 31 generates the car speed pattern for raising the car 2 according to the operation command, and is processed by the motor speed pattern generation unit 32 for converting into the motor rotation command. The inverter device 10 is driven through the device driving unit 33.

The three-phase induction motor 4 which is controlled at a variable speed by the inverter device 10 is connected to the hydraulic pump 6 and controls the discharge amount of oil sent to the hydraulic jack 3 to raise the car 2.

A car speed and an electric motor speed are input to the electric motor speed control section 22 by a speed detector 11 mounted on the car 2 and a rotation speed detector 12 mounted on the three-phase induction motor 4. This improves the control performance.

Here, a comparison of the rotational speeds of the three-phase induction motor 4 by the flow rate control method and the inverter control is as shown in FIG. That is, in the case of the flow control valve system, the respective rotation speeds of the car speed pattern rotate the three-phase induction motor 4 at the rated rotation speed from the elevator start to the stop. At this time, the hydraulic pump 6 rotated by the three-phase induction motor 4 creates a state in which the oil in the hydraulic tank 5 is circulated through the flow rate control valve 9 (bleed-off state) and throttles the flow rate control valve 9. The discharge amount of the circulating oil sent to the hydraulic jack 3 side is changed. For this reason, energy is mainly wasted when accelerating and decelerating the elevator, which causes a decrease in efficiency.

Compared with this method, the electric motor variable speed control method using an inverter can change the discharge amount of oil sent to the hydraulic jack 3 side by directly controlling the hydraulic pump 6 at a variable speed, and the car speed can be changed. The three-phase induction motor 4 can be rotated by a pattern substantially similar to the pattern.

That is, from the above comparison, it is possible to save energy only in the shaded portion shown in FIG. (B) Downward operation of hydraulic elevator (see FIG. 3B) When the car 2 of the hydraulic elevator is stopped, the electromagnetic switching valve of the check valve 8 is closed.

In this state, when the operation command unit 21 outputs a descending operation command, the speed control switching command unit 24 switches the operation logic to speed control based on the valve opening of the flow control valve 9, Valve opening speed control unit 23
The operation command is input to.

Then, in the valve opening speed control unit 23, a valve current command pattern required to drive the flow control valve 9 is generated by the car speed pattern creating unit 41 for lowering the car 2 according to the operation command. The check valve 8 and the flow rate control valve 9 are controlled by the operation sequence of the flow rate control valve 9 (FIG. 5) and the flow rate control valve driving section 43 that is driven by the flow rate control valve 9 which is converted into To be done.

Then, the oil due to the own weight of the car 2 is adjusted from the hydraulic jack 3 through the hydraulic pipe 7 by the flow control valve 9 according to the above operation command, and returned to the hydraulic tank 5, whereby the car 2 descends. To do.

The control performance is improved by inputting the car speed to the valve opening speed control unit 24 by the speed detector 11 attached to the car 2. here,
The flow control valve system and the inverter-controlled rotational speed control system of the three-phase induction motor 4 will be compared.

That is, when the inverter control is adopted for the descending operation, the three-phase induction motor 4 is in the regenerative mode in all the regions from the start to the stop of the elevator, and the three-phase induction motor 4 operates as a generator. .

Therefore, how to utilize or consume the amount of electric power from the generator becomes a problem, and as a solution to this problem, a power supply regenerative device or a resistance regenerative device is generally adopted. However, by using these devices, the cost and size of the control device increase. In the case of the hydraulic elevator, the size of the machine room is extremely limited, and thus the enlargement of the device is not particularly preferable.

On the other hand, in the flow control valve system, when the car 2 is controlled by the conventional device in the descending operation, it is not necessary to expand the device, and the car 2 is controlled by the flow control valve 9. Unlike the ascending operation, since the amount of oil returned to the hydraulic tank 5 is controlled, is stable as compared with the ascending traveling characteristic, and the traveling characteristic change due to the temperature and pressure of oil is small.

As described above, during the ascending operation of the hydraulic elevator, the three-phase induction motor 4 variable control by the inverter control is performed, and during the descending operation, the valve opening control by the flow control valve 9 is used to switch the conditions according to the conditions. By combining the good points of the inverter control and the flow control valve control, the performance and energy saving are improved.

As described above, in this embodiment, the hydraulic jack 3 for moving up and down the car 2 via the plunger 1.
Between the hydraulic jack 3 and the hydraulic pump 6, which is driven by the three-phase induction motor 4 and supplies / discharges pressure oil from the hydraulic tank 5 to the hydraulic jack 3 when moving up and down the car 2. The installed check valve 8 and the flow control valve 9 installed between the hydraulic pump 6 and the check valve 8 for adjusting the oil amount.
In the control device of the hydraulic elevator composed of
An inverter device 10 for driving the three-phase induction motor 4, a speed detector 11 for detecting the speed of the car 2 of the hydraulic elevator, a rotation speed detector 12 for detecting the rotation speed of the three-phase induction motor 4, and a hydraulic elevator. In order to allow the car 2 to move up and down in a predetermined speed pattern, the inverter device 10 is driven based on the respective detection signals from the rotation speed detector 12 and the speed detector 11 during the ascending operation of the hydraulic elevator. A speed control command value for performing variable speed control of the phase induction motor 4 is generated, and the valve opening control of the flow control valve 9 is performed based on the detection signal from the speed detector 11 during the descent operation of the hydraulic elevator. And a controller 13 that generates and outputs a speed control command value. When the hydraulic elevator is in the ascending operation, the variable speed control of the three-phase induction motor 4 is performed by the inverter device 10. During lowering operation is obtained to perform the valve opening control by the flow control valve 9.

Therefore, the control device can be realized with the minimum configuration of the system by switching the control method during the ascending / descending operation of the hydraulic elevator, and further during the ascending operation of the hydraulic elevator, the three-phase induction motor 4 is used.
Energy can be saved by the variable speed control, and by using the valve opening control of the flow control valve 9 during the descent operation, the electric power in the regenerative mode, which was necessary when the inverter control was used, can be obtained. A device for converting or consuming (a power regeneration device or a resistance regeneration device) can be eliminated, and the cost can be reduced accordingly.

This makes it possible to operate the hydraulic elevator with the best control. (Second Embodiment) FIG. 6 is a system configuration diagram showing a control device for a hydraulic elevator according to the present embodiment. The same elements as those in FIG. 1 are designated by the same reference numerals, and the description thereof will be omitted. Only the part will be described.

That is, in the present embodiment, the one in which the check valve 8 is installed between the hydraulic jack 3 and the hydraulic pump 6 in FIG. 1 described above is used as shown in FIG. The check valve 8 is installed between the and.

In the control device for the hydraulic elevator of the present embodiment configured as described above, the check valve 8 is installed between the hydraulic pump 6 and the hydraulic tank 5 so that the hydraulic jack 3 and the hydraulic pump 6 are always maintained. The pressures of the two become equal, and by controlling the hydraulic pump 6 or the flow control valve 9, the car 2 can be started smoothly.
In the case of the first embodiment, there is no need to perform the pressure adjustment which was necessary at the time of starting the hydraulic elevator, and the pressure sensor may be provided only on the hydraulic jack 3 side, and the system can be constructed with a further minimum configuration. be able to. As a result, the elevator operation can be performed with the best control, in the same manner as in the case of the first embodiment.

[0058]

As described above, according to the invention corresponding to claim 1, the hydraulic jack for raising and lowering the car through the plunger, and the hydraulic tank driven by the electric motor to raise and lower the car are moved from the hydraulic tank. A hydraulic pump for supplying / discharging pressure oil to / from the hydraulic jack; an inverter device for performing variable speed control of the electric motor during a rising operation of the hydraulic elevator;
Installed between the hydraulic jack and the hydraulic pump, the hydraulic elevator is equipped with a flow rate control valve for adjusting the amount of oil during the descent operation of the hydraulic elevator, and during the ascending operation of the hydraulic elevator, variable speed control of the electric motor by the inverter device is performed. Since the valve opening control is performed by the flow control valve during the descent operation of the hydraulic elevator, it is possible to always perform stable traveling control with the minimum required configuration without being affected by variations in hydraulic equipment. A possible hydraulic elevator controller can be provided.

Further, as described above, according to the invention corresponding to claim 2, the hydraulic jack for raising and lowering the car through the plunger, and the hydraulic tank driven by the electric motor to raise and lower the car are moved from the hydraulic tank. A hydraulic pump for supplying / discharging pressure oil to / from the hydraulic jack, a check valve installed between the hydraulic pump and the hydraulic tank, an inverter device for performing variable speed control of the electric motor during a rising operation of the hydraulic elevator, and a hydraulic pressure It is installed between the jack and the hydraulic pump, and has a flow control valve that adjusts the amount of oil during the descent operation of the hydraulic elevator.When the hydraulic elevator moves up, variable speed control of the electric motor is performed by the inverter device. Since the valve opening is controlled by the flow control valve during the elevator descent operation, it is not affected by variations in hydraulic equipment. By further minimum configuration, always stable running control controller of the hydraulic elevator can be performed can be provided.

On the other hand, as described above, according to the invention corresponding to claim 3, the hydraulic jack for raising and lowering the car through the plunger and the hydraulic tank driven by the electric motor to raise and lower the car are moved from the hydraulic tank. A hydraulic elevator control method and device comprising a hydraulic pump for supplying / discharging pressure oil to / from a hydraulic jack, and a flow control valve installed between the hydraulic jack and the hydraulic pump for adjusting an oil amount. Inverter device to be driven, speed detection means for detecting the speed of the car of the hydraulic elevator, rotation speed detection means for detecting the rotation speed of the electric motor, so that the car of the hydraulic elevator can move up and down in a predetermined speed pattern,
During the ascending operation of the hydraulic elevator, the inverter device is driven to generate a speed control command value for performing variable speed control of the electric motor based on the detection signals from the rotation speed detecting means and the speed detecting means, and the hydraulic elevator During the descending operation, the control means for generating and outputting a speed control command value for controlling the valve opening degree of the flow control valve based on the detection signal from the speed detecting means is provided. The variable speed control of the electric motor is performed by the device, and the valve opening control is performed by the flow rate control valve during the descending operation of the hydraulic elevator. Thus, it is possible to provide a hydraulic elevator control device capable of always performing stable traveling control.

As described above, according to the invention according to claim 4, the hydraulic jack for raising and lowering the car through the plunger and the hydraulic tank driven by the electric motor to raise and lower the car A hydraulic pump that supplies / discharges pressure oil to the hydraulic jack, a flow control valve that is installed between the hydraulic jack and the hydraulic pump, and that adjusts the amount of oil, and a check valve that is installed between the hydraulic pump and the hydraulic tank. In a control device for a hydraulic elevator including a valve, an inverter device for driving an electric motor, a speed detecting means for detecting a speed of a car of the hydraulic elevator, a rotational speed detecting means for detecting a rotational speed of the electric motor, and a hydraulic pressure. During the ascending operation of the hydraulic elevator, the detection signals from the rotation speed detecting means and the speed detecting means are adjusted so that the elevator car can move up and down in a predetermined speed pattern. Based on, and generates a speed control command value to drive the inverter apparatus performs variable-speed control of the electric motor,
Further, during the descent operation of the hydraulic elevator, the control device that generates and outputs a speed control command value for controlling the valve opening degree of the flow control valve based on the detection signal from the speed detection device is provided. The variable speed control of the electric motor is performed by the inverter device during operation, and the valve opening control is performed by the flow rate control valve during the descending operation of the hydraulic elevator. With the necessary minimum configuration, it is possible to provide a hydraulic elevator control device capable of always performing stable traveling control.

[Brief description of drawings]

FIG. 1 shows a first control device for a hydraulic elevator according to the present invention.
2 is a system configuration diagram showing the embodiment of FIG.

FIG. 2 is a functional block diagram showing a detailed configuration example of a controller 13 in the control device for the hydraulic elevator according to the embodiment.

FIG. 3 is a block diagram showing a speed control configuration in the control device for the hydraulic elevator according to the embodiment.

FIG. 4 is a comparison diagram of the number of rotations of the electric motor depending on the ascending car speed in the control device for the hydraulic elevator according to the embodiment.

FIG. 5 is a schematic diagram showing an operation sequence in the control device for the hydraulic elevator according to the embodiment.

FIG. 6 is a second control device for the hydraulic elevator according to the present invention.
2 is a system configuration diagram showing the embodiment of FIG.

[Explanation of symbols]

 1 ... Plunger, 2 ... Car, 3 ... Hydraulic jack, 4 ... Three-phase induction motor, 5 ... Hydraulic tank, 6 ... Hydraulic pump, 7 ... Hydraulic piping, 8 ... Check valve, 9 ... Flow control valve, 10 ... Inverter device, 11 ... Speed detector, 12 ... Rotation speed detector, 13 ... Controller, 21 ... Operation command section, 22 ... Electric motor speed control section, 23 ... Valve opening speed control section, 24 ... Speed control switching command section , 31 ... Car speed pattern creation unit, 32 ... Electric motor rotation speed pattern creation unit, 33 ... Inverter device drive unit, 41 ... Car speed pattern creation unit, 42 ... Valve current command pattern creation unit, 43 ... Flow control valve drive unit.

Claims (5)

[Claims] 1. A hydraulic jack for raising and lowering a car through a plunger; a hydraulic pump driven by an electric motor for supplying / discharging pressure oil from a hydraulic tank to the hydraulic jack when the car is raised and lowered; An inverter device that performs variable speed control of the electric motor during a rising operation of the hydraulic elevator, and a flow control valve that is installed between the hydraulic jack and the hydraulic pump and that adjusts the amount of oil during a descending operation of the hydraulic elevator, A control device for a hydraulic elevator, comprising: 2. A hydraulic jack that raises and lowers a car through a plunger; a hydraulic pump that is driven by an electric motor and that supplies / discharges pressure oil from a hydraulic tank to the hydraulic jack when moving the car up and down; A check valve installed between the hydraulic pump and the hydraulic tank, an inverter device that performs variable speed control of the electric motor during the ascending operation of the hydraulic elevator, and is installed between the hydraulic jack and the hydraulic pump, A control device for a hydraulic elevator, comprising: a flow rate control valve that adjusts the amount of oil during the descent operation of the hydraulic elevator. 3. A hydraulic jack for raising and lowering a car through a plunger; a hydraulic pump driven by an electric motor for supplying / discharging pressure oil from a hydraulic tank to the hydraulic jack when the car is raised and lowered; In a control device for a hydraulic elevator, which is installed between a hydraulic jack and a hydraulic pump and includes a flow control valve for adjusting the amount of oil, an inverter device for driving the electric motor, and a speed of a car for the hydraulic elevator are set. Speed detection means for detecting, rotation speed detection means for detecting the rotation speed of the electric motor, so that the car of the hydraulic elevator can move up and down in a predetermined speed pattern, during the rising operation of the hydraulic elevator, the rotation speed A speed at which the inverter device is driven to perform variable speed control of the electric motor based on each detection signal from the detection means and the speed detection means. A control for generating a command value and for generating and outputting a speed control command value for controlling the valve opening degree of the flow rate control valve based on the detection signal from the speed detecting means during the descent operation of the hydraulic elevator. A control device for a hydraulic elevator, comprising: 4. A hydraulic jack for raising and lowering a car through a plunger; a hydraulic pump driven by an electric motor for supplying / discharging pressure oil from a hydraulic tank to the hydraulic jack when the car is raised and lowered; In a control device for a hydraulic elevator, which is installed between a hydraulic jack and a hydraulic pump, and which comprises a flow control valve for adjusting the amount of oil, and a check valve installed between the hydraulic pump and a hydraulic tank, An inverter device that drives the electric motor, a speed detection unit that detects the speed of the car of the hydraulic elevator, a rotation speed detection unit that detects the rotation speed of the electric motor, and a car of the hydraulic elevator has a predetermined speed pattern. In order to ascend / descend by the above, during the ascending operation of the hydraulic elevator, based on each detection signal from the rotation speed detection means and the speed detection means, The inverter device is driven to generate a speed control command value for performing variable speed control of the electric motor, and during the descent operation of the hydraulic elevator, the flow control valve is opened based on the detection signal from the speed detection means. And a control means for generating and outputting a speed control command value for performing degree control, and a control device for a hydraulic elevator, comprising: 5. The electric motor based on a driving command unit that outputs a driving command according to a driving sequence of ascending or descending operation of the hydraulic elevator, and each detection signal from the rotation speed detecting unit and the speed detecting unit. The speed control command value for controlling the valve opening of the flow rate control valve is generated based on the detection signal from the electric motor speed control unit that generates the speed control command value for performing the variable speed control and outputs the speed control command value to the inverter device. A valve opening speed control unit that generates and outputs the flow rate control valve, and either the electric motor speed control unit or the valve opening speed control unit according to an up or down operation command output from the operation command unit. The hydraulic engine according to claim 3 or 4, further comprising a speed control switching command unit that outputs a switching command for switching the speed control of the car. Control device of rebate.