JPH0733341A - Control device for hydraulic elevator - Google Patents

Abstract

PURPOSE:To provide a control device of a hydraulic elevator shortening the time required for the operation preparation at the start of a rising operation and having good operation efficiency. CONSTITUTION:This control device of a hydraulic elevator is provided with a pump motor 3 driving a hydraulic pump 4 feeding pressure oil to a hydraulic jack 7 from the oil tank 6 of the hydraulic elevator, a speed control means 14 variably controlling the revolving speed of the pump motor 3, an opening/ closing position detecting means outputting the first detection signal when the full closure of the door of the elevator is detected and outputting the second detection signal when the prescribed opening of the door is detected, and a revolving speed command means 15 outputting a low-speed command indicating the revolving speed lower than that of the pump motor 3 at the time of the ordinary operation to a speed control means 14 when the second detection signal is inputted at the start of the rising operation of the hydraulic elevator and outputting an ordinary speed command indicating the revolving speed at the time of the ordinary operation of the pump motor 3 to the speed control means 14 when the first detection signal is inputted.

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.

[0002]

2. Description of the Related Art In the conventional hydraulic elevator shown in FIG. 4, when an elevator ascending operation is to be started, the AC power source 1 is contacted with the contactor 2 after the elevator door (not shown) is completely closed. The hydraulic pump 4 is driven by supplying electric power via the pump motor 3 to open the hydraulic valve 5, and oil is flown from the oil tank 6 to the hydraulic jack 7 to raise the elevator car 8.

[0003]

In the conventional case, the rotational speed of the pump motor 3 is zero from the time when the passenger gets on the car 8 and the elevator door is completely closed until the elevator starts the ascending operation. Time to reach steady speed,
Furthermore, it takes time for the discharge speed of the hydraulic pump 4 to rise from zero to the hydraulic jack side pressure after the rotational speed of the pump motor 3 reaches a steady rotational speed. Therefore, the passengers in the car 8 feel frustrated by the waiting time from when the elevator doors are completely closed to when the elevators start moving, and further, the waiting time deteriorates the driving efficiency. It was This is because the pump motor 3 is started after the door is completely closed.

It is an object of the present invention to provide a control device for a hydraulic elevator having a high operating efficiency by shortening the time required for the above-mentioned operation preparation performed at the start of the ascending operation.

[0005]

According to a first aspect of the present invention, there is provided a pump motor for driving a hydraulic pump for pressurizing oil from an oil tank of a hydraulic elevator to a hydraulic jack, and a speed for variably controlling the rotational speed of the pump motor. The control means outputs a first detection signal when detecting a fully closed state of the elevator door, and outputs a second detection signal when a predetermined degree of closing of the door is detected.
And an opening / closing position detecting means for outputting a detection signal of the pump and a rotation speed lower than the rotation speed of the pump motor during the normal operation when the second detection signal is input when the hydraulic elevator starts the ascending operation. When outputting the low speed command shown to the speed control means and inputting the first detection signal, a rotation speed output to the speed control means a normal speed command indicating the number of rotations of the pump motor during normal operation. It is a control device of a hydraulic elevator having speed command means.

According to a second aspect of the present invention, a pump motor for driving a hydraulic pump that pressurizes oil from an oil tank of a hydraulic elevator to a hydraulic jack, speed control means for variably controlling the rotation speed of the pump motor, and the elevator Opening and closing position detecting means for outputting a first detection signal when detecting the fully closed state of the door, and outputting a second detection signal when detecting a predetermined opening degree of the door, and the hydraulic elevator moving up. When the second detection signal is input, a low speed command indicating a rotation speed lower than the rotation speed during normal operation of the pump motor is output to the speed control means when the second detection signal is input, and the first detection is performed. When a signal is input, a rotation speed command means for outputting a normal speed command indicating the rotation speed of the pump motor during normal operation to the speed control means, and between the oil tank and the hydraulic jack. First hydraulic pressure detecting means for detecting the hydraulic pressure between the broken hydraulic valve and the hydraulic jack, second hydraulic pressure detecting means for detecting the hydraulic pressure between the hydraulic valve and the hydraulic pump, and the first hydraulic pressure detection And a rotation speed correction means for correcting the low speed command so that the difference between the detected values becomes a predetermined value.

[0007]

According to the first aspect of the present invention, when it is detected that the door begins to close and the predetermined degree of closing is reached when the hydraulic elevator performs the ascending operation, the rotational speed of the hydraulic pump motor is lower than that during normal operation. The hydraulic pump motor is driven at the number of revolutions, and when the door is fully closed, the hydraulic pump motor is driven at the number of revolutions during normal operation to prepare for operation at the start of ascending operation. The time can be shortened.

According to a second aspect of the present invention, when it is detected that the door begins to close and the opening degree reaches a predetermined value when the hydraulic elevator is performing an ascending operation, the rotational speed of the hydraulic pump motor is lower than that in the normal operation. When the door is fully closed, the hydraulic pump motor is driven at the number of revolutions, and the hydraulic pump motor is driven at the number of revolutions during normal operation. By adjusting the rotational speed of the hydraulic pump motor until the door is fully closed to keep the hydraulic pressure difference on the hydraulic pump side within a predetermined range, the time required for operation preparation at the start of rising operation is shortened. At the same time, the hydraulic pressure on the hydraulic jack side of the hydraulic valve and the hydraulic pressure on the oil tank side can be controlled to a uniform and stable state.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment according to the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the configuration of an embodiment according to the invention described in claim 1. At the start of elevator up operation, the elevator operation control device 9 issues an up operation command 10
Is output, the door position detection means 11 detects the open / closed position of the door, and the door position signal 12 is output. The rotation speed command device 13 inputs the door position signal 12, and speed control means 14 before the door is completely closed (for example, when the door is half closed).
On the other hand, the rotation speed command 15 is output so as to control the speed of the pump motor 3 at the rotation speed N1. The rotation speed N1 is lower than the normal rotation speed N2 of the pump motor 3 and is a slow rotation speed at which the elevator does not start even if the hydraulic valve 5 is fully opened. Therefore, the pump motor 3 rotates at the rotation speed N1 before the door is fully closed, drives the hydraulic pump 4, and increases the pressure in the hydraulic valve 5. After that, when the door is completely closed, the rotation speed command means
13 outputs a rotation speed command 15 to the speed control means 14 so as to rotate at a normal rotation speed N2, and the pump motor 3 increases the rotation speed from N1 to N2, whereby the discharge pressure of the hydraulic pump 4 is changed to the hydraulic pressure. When the pressure on the jack side is exceeded, the hydraulic valve 6 is opened and the elevator starts moving upward.

Next, the structure when the speed control means 14 and the door position detecting means 11 of FIG. 1 are made more concrete will be described with reference to FIG.
Will be explained. In FIG. 2, the same parts as those shown in FIG. 1 are designated by the same reference numerals and the description thereof will be omitted. 16
Is an inverter device for controlling the rotation speed of the pump motor 3 by the rotation speed command 15 generated by the rotation speed command device 13,
17 is a first door cam switch which is provided near the elevator door and detects that the degree of opening and closing of the door is half closed, and 18 is provided near the elevator door and detects that the degree of opening and closing of the door is fully closed The respective door position signals 19 and 20 are output to the rotation speed command device 13 by the second door cam switch. The operation of the embodiment of the present invention configured as described above will be described.

When the elevator is about to perform the ascending operation, the elevator operation control device 9 outputs an ascending operation command 10. Next, the door starts the closing operation, and when the door is closed halfway, the first door cam switch 17 detects this and outputs a door half-closed detection signal 19 to the rotation speed command device 13. In response to this, the rotation speed command device 13 outputs a rotation speed command 15 to the inverter device 16 so as to rotate the pump motor 3 at the rotation speed N1. As a result, the pump motor 3 rotates at the rotation speed N1 before the door is fully closed to increase the internal pressure of the hydraulic valve 5. This rotation speed N1 is lower than the normal pump motor rotation speed N2, and is a rotation speed that is obtained in advance by experiments or the like such that the elevator does not move even if the hydraulic valve 5 is fully opened.

After that, when the door is completely closed, the second door cam switch 18 detects this and outputs a door full closing signal 20 to the rotation speed command device 13. In response to this, the rotation speed command device 13 outputs a rotation speed command 15 to the inverter device 16 so as to rotate the pump motor 3 at the normal rotation speed N2.

As a result, the pump motor has a rotational speed of N1.
To N2, the discharge pressure of the hydraulic pump 4 is increased. When the discharge pressure of the hydraulic pump 4 becomes higher than the hydraulic jack side pressure of the hydraulic valve 5, the hydraulic valve 5 opens and the elevator starts to rise.

According to the above-described embodiment, since the rotation speed of the pump motor has already increased to N1 when the door is fully closed during the elevator ascending operation, the discharge pressure of the hydraulic pump 4 is higher than that of the conventional apparatus starting from zero. Since it is possible to approach the pressure at the beginning of the rise in advance, it is possible to start early. Also, pressure will be applied to the hydraulic valve from the time the door is closed to the time it is fully closed, but since it does not apply enough pressure to raise the elevator, the elevator will not open even if the hydraulic valve opens. It does not move with the door open, ensuring safety.

Next, an embodiment according to the invention described in claim 2 will be described with reference to FIG. 3 showing the configuration thereof. In the figure, 21 is a pressure sensor that detects the pressure on the pump side of the hydraulic valve 5, 22 is a pressure sensor that detects the pressure on the jack side of the hydraulic valve, and 23 and 24 are input to the rotation speed command device 25 with respective pressure signals. To be done.

The operation of the embodiment configured as described above will be described below. When the door is half closed at the start of the elevator rising operation, the rotation speed command device 25 issues a command to the inverter device 16 to rotate the pump motor 3 at the rotation speed N1. As a result, the pump motor 3 activates the hydraulic pump 4 to increase the discharge pressure. The pressure sensor 21 detects the pump side pressure P2. The jack side pressure sensor 22 detects the jack side pressure P1. Both pressure signals 23 and 24 are input to the rotation speed command device 25, and the continuous speed command 15 for the inverter device is corrected so that the difference between the jack side pressure P1 and the pump side pressure P2 becomes constant.

As a result, the pressure on the pump side is adjusted so that the above-mentioned relationship is satisfied before and after the hydraulic valve 5 until all the doors are closed, and the elevator is ready to start the ascending operation. After that, when all the doors are closed, the rotation speed command is increased to the normal rotation speed N2, so that the elevator starts immediately.

Before the door is completely closed at the start of the rising operation of the hydraulic elevator, the hydraulic pump is driven at a rotational speed slower than usual and the pressure on the pump side of the hydraulic valve is increased in advance so that the door is completely closed. It is possible to move the elevator immediately after closing, and it is possible to reduce the waiting time until the elevator starts moving after all the doors are closed. Also,
Until the door is completely closed, the pump will rotate at a slower speed than usual, so even if the hydraulic valve opens, there is no danger of the elevator moving with the door open.

Further, by providing pressure sensors before and after the hydraulic valve, the pressure can be increased to a state just before the elevator starts moving before the door is completely closed, so that the loss time until the elevator starts moving after all the doors are closed can be further shortened. be able to.

[0020]

According to the invention described in claim 1, the time required for the operation preparation at the time of starting the ascending operation of the hydraulic elevator can be shortened, thereby providing the control device of the hydraulic elevator with good operation efficiency. can do.

Further, according to the second aspect of the present invention, the hydraulic pressure on the hydraulic jack side of the hydraulic valve and the hydraulic pressure on the hydraulic pump side are made substantially equal until the door is fully closed at the start of the ascending operation of the hydraulic elevator. By performing the control, the ascending operation can be started immediately after the valve is fully closed, and the control device for the hydraulic elevator with higher operation efficiency can be provided.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a control device for a hydraulic elevator according to the first aspect of the present invention.

FIG. 2 is a configuration diagram of an embodiment of a control device for a hydraulic elevator according to the invention of claim 1.

FIG. 3 is a configuration diagram of a control device for a hydraulic elevator according to a second aspect of the invention.

FIG. 4 is a configuration diagram of a conventional hydraulic elevator control device.

[Explanation of symbols]

 1 ... AC power supply 3 ... Pump motor 4 ... Hydraulic pump 5 ... Hydraulic valve 6 ... Oil tank 7 ... Hydraulic jack 8 ... Elevator car 9 ... Elevator operation control device 10 ... Rise operation command 11 ... Door position detection means 12 ... Door position detection Signal 13 ... Rotation speed command means 14 ... Speed control means 15 ... Rotation speed command

Claims (2)

[Claims] 1. A pump motor for driving a hydraulic pump that pressurizes oil from an oil tank of a hydraulic elevator to a hydraulic jack, speed control means for variably controlling the rotational speed of the pump motor, and full closing of the elevator door. An opening / closing position detecting means for outputting a first detection signal when detecting a predetermined opening degree and a second detection signal when detecting a predetermined closing degree of the door, and when the hydraulic elevator performs an ascending operation, When the second detection signal is input, a low speed command indicating a rotation speed lower than the rotation speed of the pump motor during normal operation is output to the speed control means, and when the first detection signal is input. Is a control device for a hydraulic elevator having a normal speed command indicating the number of revolutions of the pump motor during normal operation, and a rotation speed command means for outputting to the speed control means. 2. A pump motor that drives a hydraulic pump that pressurizes oil from an oil tank of a hydraulic elevator to a hydraulic jack, speed control means that variably controls the rotational speed of the pump motor, and the elevator door is fully closed. An opening / closing position detecting means for outputting a first detection signal when detecting a predetermined opening degree and a second detection signal when detecting a predetermined closing degree of the door, and when the hydraulic elevator performs an ascending operation, When the second detection signal is input, a low speed command indicating a rotation speed lower than the rotation speed of the pump motor during normal operation is output to the speed control means, and when the first detection signal is input. Is a rotation speed command means for outputting to the speed control means a normal speed command indicating the rotation speed of the pump motor during normal operation, a hydraulic valve provided between the oil tank and the hydraulic jack, and First hydraulic pressure detecting means for detecting the hydraulic pressure between the hydraulic jacks, second hydraulic pressure detecting means for detecting the hydraulic pressure between the hydraulic valve and the hydraulic pump, the first hydraulic pressure detecting means and the second hydraulic pressure detecting means. And a rotation speed correction means for correcting the low speed command so that the difference between the detected values becomes a predetermined value.