JPH10218515A - Hydraulic elevator device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of the positioning work of the car of a hydraulic elevator to a hall in floor height by preventing oil pressure relief in the elevator. SOLUTION: A hydraulic elevator involves a valve 22 adapted to be opened or closed by a controller 20 in a feed passage of pressure oil led to a hydraulic cylinder 2. When a predetermined period lapses after the stop of a car 1 at a specific landing position, the controller 20 operates to detect a dislocation of the car 1 to a hall 17 in floor height. If the detected floor dislocation exceeds a predetermined level, the controller 20 opens the valve 22 to correct the dislocation, while if the dislocation falls below the predetermined level, the controller 20 closes the valve 22. That control prevents pressure relief in the cylinder 2 to thereby lessen the settlement of the car 1 to the hall 17 and eliminate the unfavorable possibility of a user's overturn or being uncomfortable because of the step between the car 1 and the hall 17.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic elevator system, and more particularly to a hydraulic elevator system which corrects a step between a car and a landing caused by a sinking of a car when the car has been stopped for a long time. .

[0002]

2. Description of the Related Art Various types of elevator devices have been put into practical use. However, pressure oil from a hydraulic pump is sent to a cylinder and a plunger is pushed up to raise the car and return the cylinder oil to a tank. Hydraulic elevator devices that lower the car by doing so are one of them.

FIG. 5 is a system diagram showing a schematic configuration of a hydraulic elevator apparatus of a type in which an elevator car is directly pushed up by a plunger. The hydraulic elevator apparatus will be described with reference to FIG.

An elevator car 1 is supported by a plunger 3 of a hydraulic cylinder 2. Pressure oil is supplied to the hydraulic cylinder 2 from an oil tank 4 via a pump 5, and a check valve 6 and a stop valve 7 are provided in a supply path of the pressure oil. The stop valve 7 is manually opened and closed to stop the flow of the pressure oil between the hydraulic cylinder 2 and the oil tank 4, and is normally opened except for being closed at the time of maintenance. Reference numeral 8 denotes an oil suction pipe for sucking oil in the oil tank 4 into the pump 5, and the pump 5 is driven by a motor 9.

A return oil pipe 11 communicates with the oil tank 4 via a flow control valve 10 from an intermediate portion of the pressure oil supply path between the check valve 6 and the stop valve 7.
A safety valve 12 is provided between the pump and the outlet side of the pump 5. Reference numeral 13 denotes an ascending operation push button switch, and reference numeral 14 denotes a descending operation push button switch.

First, when raising the car 1, the push button switch 13 is pressed to operate the motor 9. The motor 9 drives the pump 5 to send pressure oil from the oil tank 4 to the hydraulic cylinder 2, so that the plunger 3 is pushed up to raise the car 1. At this time, since the flow control valve 10 is closed and the check valve 6 is provided, the pressure oil does not flow backward from the hydraulic cylinder 2 side to the pump 5 side.

On the other hand, when lowering the car 1, the push button switch 14 is pressed to open the flow control valve 10. Therefore,
The weight of the car 1 and the loading load act thereon, and the oil in the hydraulic cylinder 2 returns to the oil tank 4 through the return oil pipe 11, whereby the car 1 descends.

In the conventional hydraulic elevator system, when the car is stopped for a long time, the car naturally descends due to the release of hydraulic pressure or the like, that is, a so-called sinking phenomenon occurs, and a step occurs between the car and the landing. There was a problem that would.

Therefore, conventionally, when the amount of settlement of the car exceeds a certain value, the motor 9 is operated to drive the pump 5, and the floor of the car 1 and the landing are aligned. FIG.
1 shows a schematic configuration of a conventional hydraulic elevator apparatus which performs such floor matching.

The hydraulic elevator apparatus shown in FIG. 6 is of a type in which the movement of the plunger 3 is transmitted to the car 1 via a rope 15, but is basically the same as that shown in FIG. Therefore, the same parts as those in FIG. 5 are denoted by the same reference numerals. Reference numeral 16 denotes a rail for guiding the elevation of the car 1, reference numeral 17 denotes a landing, reference numeral 18 denotes a control valve comprehensively showing the check valve 6, the flow control valve 10, and the safety valve 11 shown in FIG. A landing device for detecting the landing position of the car 1, a control device 20 for controlling the opening and closing of the control valve 18, etc., and an electromagnetic contactor 21.

Since the elevator apparatus is usually provided with a landing device 19 for detecting the landing position of the car 1, the landing device 19 is used to release the car 1 by pressure relief or the like. When the sinking amount exceeds a certain value, a landing signal 19a indicating that the car 1 has sunk and the landing position is shifted is sent from the landing device 19 which detects the landing position of the car to the control device 20. Send to Control device 20 receiving this signal
Closes the electromagnetic contactor 21 and operates the motor 9 to drive the hydraulic pump 5 so that the control valve 18
To the hydraulic cylinder 2 to raise the car 1.
When the floor of the car 1 and the floor of the landing 17 coincide with each other, the motor 9 is stopped.

[0012]

As described above, in the conventional hydraulic elevator system, it was not possible to reduce the hydraulic pressure leak itself, so it was necessary to frequently adjust the floor of the car and the landing. Therefore, the driving noise and vibration of the motor and the hydraulic pump have been troublesome to the surroundings, especially at night. The present invention has been made to solve such a conventional problem.

[0013]

SUMMARY OF THE INVENTION The present invention relates to a hydraulic elevator apparatus for raising a car by supplying pressure oil to a hydraulic cylinder and lowering the car by returning the oil to a tank. A valve means provided in a supply path of pressure oil to the car and controlled to open and close; a detecting means for detecting a state of bed slip when a predetermined time elapses after the car stops at a predetermined landing position; When it is detected that exceeds a predetermined amount, the valve means is opened to perform floor matching, and when the detection means detects that the bedsore does not reach the predetermined amount, the valve means is closed. And control means for performing the control as described above.

[0014] Thus, since the pressure relief of the hydraulic pressure can be reduced, the amount of sinking of the car can be reduced, and the number of times of floor matching can be reduced. Accordingly, nighttime vibration and noise can be reduced.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention is shown in FIG.
This will be described in detail with reference to FIG. In these drawings, the same components as those in FIG. 6 are denoted by the same reference numerals, and detailed description is omitted.

FIG. 1 shows a first embodiment in which the present invention is applied to the hydraulic elevator apparatus shown in FIG.
An electric stop valve 22 whose opening and closing is electrically controlled, for example, is provided in series with the manual stop valve 7 in a pipeline from the outlet side of the control valve 18 to the hydraulic cylinder 2.
The opening and closing of the valve 22 is controlled by a control signal 2 from the controller 20.
2a. It is needless to say that the electric stop valve 22 is not limited to electricity, and may be controlled by various signals such as sound, light, and pressure.

Next, the operation of the hydraulic elevator apparatus according to the present invention will be described with reference to the flowchart shown in FIG.

First, the control device 20 determines whether or not a predetermined time has elapsed since the car 1 was stopped (step 10).
1) When the predetermined time has elapsed, the landing signal 19a from the landing device 19 that detects the landing position of the car is received, and the landing position is such that the car 1 sinks and needs to be corrected. Is determined (step 102). If a predetermined amount of bedsore is detected, the electric stop valve 2
2 is determined (step 103).
Is closed, a control signal 22a is sent from the control device 20 to open the electric stop valve 22 (step 10).
At the same time as 4), the electromagnetic contactor 21 is closed to perform floor matching.

That is, when the electromagnetic contactor 21 is closed, the motor 9 operates to drive the hydraulic pump 5 to send pressure oil from the oil tank 4 to the hydraulic cylinder 2 via the control valve 18 and raise the car 1. When the floor of the car 1 and the landing 17 coincide with each other, the electromagnetic contactor 21 is opened, the motor 9 is stopped, and the floor matching is completed.

When the flooring is completed, the control unit 20
Sends a signal to close the electric stop valve 22, and closes the electric stop valve 22 (step 107).
Step 2 until a hall call occurs in Step 108
To monitor the bedsore, thereby preventing the pressure from the hydraulic cylinder 2 from leaking. Then, when a hall call occurs (step 108), the electric stop valve 22 is opened by the control signal 22a (step 109), and the elevator operation of the car 1 is restarted.

If it is determined in step 102 that the bedsore is not enough to require correction, it is checked whether the electric stop valve 22 is open (step 106). If it is open, the electric stop valve 22 is closed by the control signal 22a (step 107), and the process proceeds to step 108 to monitor the bedsore until a hall call occurs. If it is determined in step 106 that the electric stop valve 22 is closed, the process proceeds to step 108 to monitor the bedsore until a hall call occurs.

As described above, according to the present embodiment, the car 1
By stopping the electric stop valve 22 during the stop, the pressure from the hydraulic cylinder 2 is prevented from leaking, and the amount of sinking of the car 1 can be reduced. Therefore, it is possible to reduce the inconvenience of the user falling down or feeling uncomfortable due to the step between the car 1 and the landing 17. In addition, the number of times of floor matching can be reduced, and nighttime vibration and noise can be reduced.

FIG. 3 is a system diagram showing a second embodiment of the present invention. In this embodiment, means for detecting whether or not the squat amount of the car 1 exceeds a predetermined value. In this case, a car position detecting device 23 normally provided in an elevator apparatus is used. Accordingly, when the amount of settlement of the car 1 exceeds a certain value due to pressure loss or the like, the car position detecting device 23 which detects the position of the car, outputs a position signal indicating that the car 1 has settled and the position is shifted. 23a is transmitted to the control device 20, and the subsequent operation is the same as that described in the flowchart of FIG.

FIG. 4 is a system diagram showing a third embodiment of the present invention. In this embodiment, as a means for detecting whether or not the squat amount of the car 1 exceeds a predetermined value. , And both the landing detection device 19 and the car position detection device 23 are used. Therefore, cage 1
When the sinking amount of the car exceeds a certain value, a landing signal 19a indicating that the car 1 has subsided and the landing position is shifted from the landing device 19 which detects the landing position of the car, From the car position detecting device 23 which has detected the position of the car 1 and a position signal 23a indicating that the car 1 has sunk and the position is shifted, is transmitted to the control device 20. Or when both signals arrive, floor matching is performed. The operation is the same as that described in the flowchart of FIG.

[0025]

As described above in detail, according to the present invention, a stop valve whose opening and closing is controlled is provided in a pipeline from the outlet side of the control valve to the hydraulic cylinder, and while the car is stopped, By closing this stop valve, pressure from the hydraulic cylinder is prevented from leaking, so that the amount of sinking of the car can be reduced. Therefore, it is possible to reduce the inconvenience of the user falling down or feeling discomfort due to the step between the car and the landing, and also reduce the number of times of floor matching, and reduce vibration and noise at night. A hydraulic elevator apparatus having an effect is provided.

[Brief description of the drawings]

FIG. 1 is a system diagram showing a schematic configuration of a first embodiment of a hydraulic elevator apparatus according to the present invention.

FIG. 2 is a flowchart shown to explain an operation of the apparatus shown in FIG. 1;

FIG. 3 is a schematic configuration diagram showing a second embodiment of the present invention.

FIG. 4 is a schematic configuration diagram showing a third embodiment of the present invention.

FIG. 5 is a system diagram showing a schematic configuration of a conventional hydraulic elevator apparatus of a type in which a car is directly pushed up by a plunger.

FIG. 6 is a system diagram showing a schematic configuration of a conventional hydraulic elevator apparatus in which the movement of a plunger is transmitted to a car via a rope.

[Explanation of symbols]

 Reference Signs List 1 basket 2 hydraulic cylinder 3 plunger 4 oil tank 5 pump 8 oil suction pipe 9 motor 11 return oil pipe 17 landing 18 control valve 19 landing device 20 control device 21 electromagnetic contactor 22 electric stop valve

Claims (4)

[Claims] 1. A hydraulic elevator apparatus for raising a car by supplying pressure oil to a hydraulic cylinder and lowering the car by returning the oil to a tank, wherein a path for supplying pressure oil to the hydraulic cylinder is provided. A valve means provided and controlled to open and close; a detecting means for detecting a state of bedsore when the car stops at a predetermined landing position and a predetermined time has passed; a bedslip exceeding a predetermined amount by the detecting means. Control means for opening the valve means to perform floor matching when detected, and controlling to close the valve means when the detection means detects that the bedsore has not reached a predetermined amount. A hydraulic elevator apparatus comprising: 2. The hydraulic elevator apparatus according to claim 1, wherein said detecting means for detecting a floor slip is a landing apparatus for detecting a landing position of a car. 3. The hydraulic elevator apparatus according to claim 1, wherein said detecting means for detecting a floor slip is a car position detecting device detecting a car position. 4. A hydraulic system according to claim 1, wherein said detecting means for detecting a floor slip comprises a landing device for detecting a landing position of a car and a car position detecting device for detecting a position of the car. Elevator equipment.