JP2008044736A - Control device for hydraulic elevator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a control device for a hydraulic elevator controlling a hydraulic pump to equalize differential pressure between pressure sensors when differential pressure between two pressure sensors arranged in a line between a hydraulic jack and a hydraulic shut-off valve and in a line between the hydraulic shut-off valve and a control operating valve becomes a set value or more. <P>SOLUTION: This control device for the hydraulic elevator provided with the control shut-off valve 5 arranged between the hydraulic pump 3 and the hydraulic jack 1 and controlling a flow rate of pressure oil and the hydraulic shut-off valve arranged adjacently to the hydraulic jack between the control shut-off valve and the hydraulic jack and closed to shut out a pressure oil flow when a car 2 is stopped for incoming and outgoing passengers, is provided with: the jack side pressure sensor 30 arranged in the line between the hydraulic jack and the hydraulic shut-off valve and detecting pressure; the intermediate pressure sensor 31 arranged in the line between the hydraulic shut-off valve and the control operating valve and detecting pressure; and the control device controlling the operation of the hydraulic pump to equalize outputs of the pressure sensors when pressure difference between two pressure sensors becomes the set value or more. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a control device for a hydraulic elevator.

  Conventionally, as shown in FIG. 5, a hydraulic pump device 18 is connected to a hydraulic jack 1 via a control opening / closing valve circuit 17 as a hydraulic elevator device that reduces the amount of ups and downs of a car that occurs when passengers get on and off the elevator car. Then, a car 2 that moves up and down by a hydraulic jack 1 is provided. Further, a stop-time on-off valve 20 is provided near the hydraulic jack 1 between the hydraulic jack 1 and the control on-off valve circuit 17, the supply of pressure oil to the hydraulic jack 1 is commanded to raise the car 2, and the hydraulic jack 1 Has been proposed in which the discharge of pressure oil is commanded to lower the car 2 and the control device 13 is provided to close the on-off valve 20 when the car 2 is stopped (see, for example, Patent Document 1). ). This means that the on-off valve 20 is closed (usually open) only when the car is open, so that elevator users can get on and off.

  As another prior art, there is one using a hydraulic shut-off valve L10 as shown in FIG. In this case, the solenoid LE is demagnetized when stopped, and the main valve LV is closed to block the flow from the cylinder to the tank. During the ascending operation, the pressure oil passes through port A by driving the pump, pushes down the main valve LV, and flows from port B to the jack. At this time, the solenoid LE need not be energized. During the descending operation, the solenoid LE is excited simultaneously with the opening command of the control on-off valve 5. As a result, a flow of port B → solenoid LE → port A occurs, the main valve LV is opened, pressure oil flows out from the jack, and the car descends. After the stop is determined, the flow rate of the pressure oil passing through the main valve LV is reduced, the opening of the main valve LV is also reduced, and the solenoid LE is demagnetized at the same time as being fully closed (see FIG. 7). Here, the hydraulic shut-off valve L10 is normally closed, and the car is always in a small amount of ups and downs. Only when necessary (descent operation), the solenoid LE is excited to open the pipeline. As in Patent Document 1, it is not necessary to excite the solenoid every time the door is opened and closed.

  Also, a hydraulic pump is connected to the primary side of the flow control valve and a hydraulic jack is connected to the secondary side of the flow control valve. Based on the detection output of the pressure sensor on the hydraulic jack side, the detected output of the pressure sensor and the oil flowing through the hydraulic jack A control command value is generated using a control target value that takes into account the pressure loss value generated by the detection output of the temperature sensor that detects the temperature of the oil and a feedback value that is generated based on the detection output of the pressure sensor on the hydraulic pump side. A control device for a hydraulic elevator that controls a flow rate control valve based on the control command value is known (see, for example, Patent Documents 2 and 3).

Japanese Patent Laid-Open No. 11-322207 (FIG. 1) JP-A-8-67432 JP 2002-536270 A

  In the conventional hydraulic elevator apparatus, for example, the stop on-off valve 20 and the hydraulic shut-off valve L10 are in a closed state from the state where there is no passenger in the car 2 to the case where the maximum number of passengers are on the jack 1, and the jack 1 Side pressure and the control on / off valve 5 side pressure are greatly different. If the on-off stop valve 20 and the hydraulic shutoff valve L10 are opened immediately before the descending operation, the car will have a difference due to the difference in pressure. There is a problem that 2 falls suddenly and appears as a start-up shock. Further, in the hydraulic elevator apparatus as shown in FIG. 6, when the car is stopped for a long time, with the passage of time, oil contraction due to a decrease in oil temperature or oil leakage from the control on-off valve 5 causes the inside of the second circuit 6 b. The pressure drops. When the hydraulic jack 1 and the control opening / closing valve 5 are installed at a distance, the piping length of the second circuit 6b becomes long. Therefore, it becomes easy to be affected when the car 2 is stopped for a long time, and the pressure in the second circuit 6b becomes lower than the pressure in the hydraulic jack 1. In this case as well, there is a problem that a starting shock may occur as described above.

  In addition, in the prior art, the pressure before and after the valve is detected and travel (flow rate) control is performed using the difference between the pressures. During the stop operation, the pressure drop during the long-term stop is corrected during the stop. It does not reduce the shock.

  The present invention has been made to solve the above problems, and in a hydraulic elevator in which a hydraulic on-off valve is provided in the vicinity of the hydraulic jack separately from the control on-off valve, a pipe line between the hydraulic jack and the hydraulic on-off valve In addition, pressure sensors are provided in the pipelines between the hydraulic on-off valve and the control on-off valve, respectively, and when the differential pressure between the two pressure sensors exceeds the set value, the hydraulic pump is controlled so that the two pressure sensors are equal. A control device for a hydraulic elevator is provided.

  A control device for a hydraulic elevator according to the present invention is provided between a hydraulic jack that drives a car up and down, a hydraulic pump that supplies pressure oil to the hydraulic jack, and between the hydraulic pump and the hydraulic jack, and controls the flow rate of the pressure oil. Hydraulic control provided with a control on-off valve and a hydraulic on-off valve that is provided between the control on-off valve and the hydraulic jack and in the vicinity of the hydraulic jack and shuts off when the car stops and passengers get on and off to shut off the flow of pressure oil In an elevator, a jack-side pressure sensor is provided in a pipe line between a hydraulic jack and a hydraulic on-off valve, and detects a pressure in the pipe, and a pipe line between the hydraulic on-off valve and the control on-off valve. An intermediate pressure sensor to detect, and a control device for controlling the operation of the hydraulic pump so that the outputs of the two pressure sensors become equal when the pressure difference between the two pressure sensors exceeds a set value. It is intended.

  According to the present invention, a jack-side pressure sensor for detecting the pressure in the pipe provided in the pipe line between the hydraulic jack and the hydraulic on-off valve, and a pipe line between the hydraulic on-off valve and the control on-off valve, An intermediate pressure sensor that detects the pressure in the pipe and a control device that controls the operation of the hydraulic pump so that the outputs of the two pressure sensors become equal when the pressure difference between the two pressure sensors exceeds a set value. Therefore, the pressure value of the pressure oil before and after the hydraulic control valve can always be kept within the predetermined value, so that the shock at the start of the descent operation can be reduced. Further, by changing the set value of the differential pressure between the normal time and the rest time, it is possible to reduce the number of times the hydraulic pump is activated during the rest time.

Embodiment 1.
FIG. 1 is a hydraulic circuit diagram showing a hydraulic elevator control apparatus according to Embodiment 1 of the present invention, and FIG. 2 is a flowchart for explaining the operation of the hydraulic elevator control apparatus according to Embodiment 1 of the present invention.

  In FIG. 1, 1 is a hydraulic jack, 2 is a car supported by the hydraulic jack 1, 3 is a hydraulic pump that can be rotated in reverse, 4 is an electric motor that drives the hydraulic pump 3, 5 is a control on-off valve, A back chamber 5c isolated from the main chamber 5a through a valve body 5b is provided. Reference numeral 6 denotes a main circuit for pressure oil, a first circuit 6a connecting the hydraulic pump 3 and the main chamber 5a of the control on / off valve 5, and a hydraulic on / off operation described later disposed near the main chamber 5a of the control on / off valve 5 and the hydraulic jack 1. The second circuit 6b is connected to the valve L10, and the third circuit 6c is connected to the hydraulic jack 1 and the hydraulic on-off valve L10. 7 is a filter, 8 is an oil tank, and 9 is a pilot circuit. The pressure oil inflow circuit 9a connects the second circuit 6b and the back chamber 5c of the control on / off valve 5, and the back chamber 5c of the control on / off valve 5 and the oil tank 8 open. It is formed by a first pressure oil discharge circuit 9b connected to the low pressure port and a second pressure oil discharge circuit 9c provided between an opening adjusting throttle 14 described later and a second normally closed electromagnetic valve 15. A first normally closed electromagnetic valve 10 is provided in the first pressure oil discharge circuit 9b and opens or closes the circuit. 11 is a variable throttle valve provided in the pressure oil inflow circuit 9a, 12 is a variable throttle valve provided in the first pressure oil discharge circuit 9b, 13 is a first normally closed solenoid valve 10, a hydraulic on-off valve L10, and an electric motor 4. A control device 14 for controlling is an opening adjustment throttle that allows the control on-off valve 5 to be held at a predetermined opening between fully open and fully closed during deceleration of the descending operation. 14a is a sleeve that forms the opening of the variable throttle 14b of the opening adjustment throttle 14, 15 is a second normally closed solenoid valve connected to the second pressure oil discharge circuit 9c, and 16 is a second normally closed solenoid valve 15 and an oil tank. A variable adjustment throttle 17 provided between 8 and 17 is a control on-off valve circuit having the control on-off valve 5 as a main device. Reference numeral 18 denotes a hydraulic pump device including the hydraulic pump 3 and the electric motor 4, and reference numeral 19 denotes a speed detection device that detects the ascending / descending speed of the car 2 via an endless rope held on one side of the car 2. L10 is a hydraulic on / off valve that is composed of an electromagnetic valve arranged in the second circuit 6b near the hydraulic jack 1 in addition to the control on / off valve 5. When the car 2 stops and the passenger gets on and off, it closes and flows the pressure oil. It is a thing to cut off. 30 is a jack-side pressure sensor for detecting the pressure in the third circuit 6c, which is a pipe line connecting the hydraulic jack 1 and the hydraulic on-off valve L10, and 31 is a main chamber 5a of the control on-off valve 5 and the hydraulic on-off valve L10. It is an intermediate pressure sensor that detects the pressure in the second circuit 6 b that is a pipe line that connects the two, and the values of these two sensors 30 and 31 are taken into the control device 13. Note that the hydraulic on-off valve L10 is a simplified circuit shown in FIG.

Next, the operation of the hydraulic elevator control device will be described with reference to the flowchart shown in FIG. This flowchart is a subroutine called periodically.
First, in step S1, the values of the two pressure sensors 30, 31 are captured. In step S2, the value of the variable PUP is confirmed. The initial value of the variable PUP is 0, and the process proceeds to step S3. In step S3, the values of the two pressure sensors 30, 31 are compared. If the pressure difference is equal to or less than the preset value in step S3, the process proceeds to step S4, and the process is completed only by resetting the variable PUP to 0. Normally, this route will be visited.
Here, when the pressure difference between the two pressure sensors 30, 31 becomes equal to or larger than the set value, the process proceeds from step S3 to step S5, and a drive command for the hydraulic pump 3 is generated in step S5. Thereby, pressure oil is supplied to the 2nd pipe line 6b. Next, in step S6, 1 is set in the variable PUP and the fact that the hydraulic pump 3 is being driven is stored. When the pressure oil is being supplied, the value of the variable PUP becomes 1 in step S2, and the process proceeds to step S7. Therefore, thereafter, processing is performed by the route of step S1, step S2, step S7, step S5, and step S6.
Next, when pressure oil is supplied by the hydraulic pump 3 and it is determined in step S7 that the value of the pressure difference between the two pressure sensors 30, 31 has become 0, the process proceeds from step S7 to step S8, and then to step S8. Then, a stop command for the hydraulic pump 3 is generated, and the supply of pressure oil to the second pipeline 6b is stopped. In step S9, the value of the variable PUP is set to 0, and a series of operation memories are reset. As a result, the operation of the hydraulic pump 3 is controlled so that the outputs of the two pressure sensors 30, 31 are equal.

  As described above, according to the first embodiment of the present invention, the pressure values of the pressure oil in the second circuit 6b and the third circuit 6c can always be kept within a predetermined value. Shock can be reduced.

Embodiment 2.
FIG. 3 is a flowchart for explaining the operation of the hydraulic elevator control apparatus according to Embodiment 2 of the present invention.

FIG. 3 is a flowchart relating to setting of the differential pressure determination value of the two pressure sensors 30 and 31.
First, in step S11, it is determined whether or not the hydraulic elevator is at rest. If the normal service operation is in progress, the process proceeds to step S12, where the normal pressure value is set as the differential pressure determination value. On the other hand, if the hydraulic elevator is at rest, the process proceeds to step S13, and the resting is set as the differential pressure determination value. The set value for pause is larger than the normal value.
Thereby, since the differential pressure determination value when the hydraulic elevator is stopped is larger than normal, it takes time until the differential pressure becomes large, so that the number of activations of the hydraulic pump 3 can be reduced.

Embodiment 3.
FIG. 4 is a flowchart for explaining the operation of the hydraulic elevator control apparatus according to Embodiment 3 of the present invention.

FIG. 4 is a flowchart when the hydraulic on-off valve L10 is driven when a differential pressure is generated. This flowchart is a subroutine called periodically.
First, in step S21, the values of the two pressure sensors 30, 31 are captured. In step S22, the value of the variable PDN is confirmed. The initial value of the variable PDN is 0, and the process proceeds to step S23. In step S23, the values of the two pressure sensors 30, 31 are compared. If the pressure difference is equal to or smaller than the preset value in step S23, the process proceeds to step S24, and the process is ended only by resetting the variable PDN to 0. Normally, this route will be visited.
Here, when the pressure difference between the two pressure sensors 30, 31 becomes equal to or larger than the set value, the process proceeds from step S23 to step S25, and a drive command for the hydraulic on-off valve L10 is generated in step S25. Thereby, pressure oil flows into the 2nd pipe line 6b from the 3rd pipe line 6c with a high pressure. Next, in step S26, 1 is set in the variable PDN, and it is stored that the hydraulic on-off valve L10 is being driven. When pressure oil is flowing out from the third pipeline 6c to the second pipeline 6b, the value of the variable PDN becomes 1 in step S22, and the process proceeds to step S27. Therefore, thereafter, processing is performed by the route of step S21 → step S22 → step S27 → step S25 → step S26.
Next, when the pressure oil flows out from the third pipe 6c to the second pipe 6b and it is determined in step S27 that the pressure difference between the two pressure sensors 30 and 31 has become 0, the flow proceeds from step S27. Proceeding to step S28, a stop command for the hydraulic on-off valve L10 is generated at step S28, and the outflow of the pressure oil from the third pipeline 6c to the second pipeline 6b is completely blocked. In step S29, the value of the variable PDN is set to 0, and a series of operation memories are reset. As a result, the opening / closing of the hydraulic on-off valve L10 is controlled so that the outputs of the two pressure sensors 30, 31 are equal.

  Thereby, since the pressure value of the pressure oil in the second circuit 6b and the third circuit 6c can always be kept within a predetermined value, a shock at the start of the descent operation can be reduced.

It is a hydraulic circuit diagram which shows the control apparatus of the hydraulic elevator in Embodiment 1 of this invention. It is a flowchart for demonstrating operation | movement of the control apparatus of the hydraulic elevator in Embodiment 1 of this invention. It is a flowchart for demonstrating operation | movement of the control apparatus of the hydraulic elevator in Embodiment 2 of this invention. It is a flowchart for demonstrating operation | movement of the control apparatus of the hydraulic elevator in Embodiment 3 of this invention. It is a hydraulic circuit diagram which shows the control apparatus of the conventional hydraulic elevator. It is a hydraulic circuit diagram which shows the other example of the control apparatus of the conventional hydraulic elevator. It is a characteristic view which shows the operation | movement of the conventional hydraulic elevator in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hydraulic jack 2 Car 3 Hydraulic pump 4 Electric motor 5 Control on-off valve 5a Main chamber 5b Valve body 5c Back chamber 6 Main circuit 6a of pressure oil First circuit 6b Second circuit 6c Third circuit 7 Filter 8 Oil tank 9 Pilot circuit 9a Pressure Oil inflow circuit 9b First pressure oil discharge circuit 9c Second pressure oil discharge circuit 10 First normally closed solenoid valve 11, 12 Variable throttle valve 13 Controller 14 Opening adjustment throttle 14a Adjustment screw 14b Variable throttle 14c Sleeve 15 Second always Closed solenoid valve 16 Variable adjustment throttle 17 Control on-off valve circuit 18 Hydraulic pump device 19 Speed detector 20 Stop on-off valve L10 Hydraulic on-off valve 30 Jack side pressure sensor 31 Intermediate pressure sensor

Claims (3)

A hydraulic jack that drives the car up and down, a hydraulic pump that supplies pressure oil to the hydraulic jack, a control on-off valve that is provided between the hydraulic pump and the hydraulic jack, and controls the flow rate of the pressure oil, and the control on-off In a control apparatus of a hydraulic elevator provided between a valve and the hydraulic jack and in the vicinity of the hydraulic jack, and having a hydraulic on-off valve that is closed when the car stops and a passenger gets on and off to shut off the flow of pressure oil ,
A jack-side pressure sensor that is provided in a pipe line between the hydraulic jack and the hydraulic on-off valve and detects a pressure in the pipe;
An intermediate pressure sensor that is provided in a pipe line between the hydraulic on-off valve and the control on-off valve and detects the pressure in the pipe;
A control device that controls the operation of the hydraulic pump so that the outputs of the two pressure sensors become equal when the pressure difference between the two pressure sensors exceeds a set value;
A control apparatus for a hydraulic elevator, comprising: A hydraulic jack that drives the car up and down, a hydraulic pump that supplies pressure oil to the hydraulic jack, a control on-off valve that is provided between the hydraulic pump and the hydraulic jack, and controls the flow rate of the pressure oil, and the control on-off In a control apparatus of a hydraulic elevator provided between a valve and the hydraulic jack and in the vicinity of the hydraulic jack, and having a hydraulic on-off valve that is closed when the car stops and a passenger gets on and off to shut off the flow of pressure oil ,
A jack-side pressure sensor that is provided in a pipe line between the hydraulic jack and the hydraulic on-off valve and detects a pressure in the pipe;
An intermediate pressure sensor that is provided in a pipe line between the hydraulic on-off valve and the control on-off valve and detects the pressure in the pipe;
A control device for controlling the opening and closing of the hydraulic on-off valve so that the outputs of the two pressure sensors become equal when the pressure difference between the two pressure sensors exceeds a set value;
A control apparatus for a hydraulic elevator, comprising:   3. The hydraulic elevator control device according to claim 1, wherein the set value of the pressure difference is set to a value that is larger than the set value during normal operation when the set value during rest is set.

Images