JP3067390B2 - How to correct stroke of hydraulic elevator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for correcting a stroke of a hydraulic elevator, and more particularly to a technique for automatically performing a stroke correction and eliminating a stroke correction operation.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 2, a first piston 2 is provided in a cylinder tube 1 installed in a vertical direction so as to be able to move up and down. The tube 3 is projected from the upper end of the cylinder tube 1 so as to be able to change the amount of projection, and a second piston 4 is provided in the small diameter tube 3 so as to be able to move up and down.
The piston rod 8 extends upward, the piston rod 8 protrudes from the upper end of the small-diameter tube 3 so as to be freely protruded, the through-hole 5 penetrates through the second piston 4, and the small-diameter tube 3 is inserted into and out of the small-diameter tube 3. A communication hole 6 is formed to communicate the hydraulic fluid, a port 7 for introducing hydraulic oil for raising the first piston 2 is formed below the first piston 2, and a cylinder tube 1 and a small-diameter tube 3 are formed above the first piston 2. And the hydraulic elevator in which the pressure oil 9 is sealed between the small-diameter tube 3 and the piston rod 8,
The pressure oil 9 sealed above the first piston 2 leaks to the outside as shown by an arrow A, or the amount of the pressure oil 9 leaked to the inside as shown by an arrow B decreases. is there.

When the amount of the pressure oil 9 decreases, the distance L ₂ between the first piston 2 and the second piston 4 cannot be secured, and when the distance L ₂ becomes zero, The second piston 4 collides with the first piston 2 to generate a shock. In the case of the telescopic configuration, the distance L ₁ + the distance L ₂ between the first piston 2 and the bottom is constant (constant; L ₁ increases as L ₂ decreases), and the distance L ₁ + distance L ₂ > If L ₃ (the amount of allowance in the upper part of the rising stroke), the P surface of the first piston 2 collides with the R surface before S ₂ becomes zero, and a shock occurs. Then, in order to operate without causing a shock, it is only necessary to set L ₁ + L ₂ <L ₃ and to operate such that L ₂ > 0.

[0004]

By the way, in order to make L ₂ > 0 even if the pressurized oil 9 leaks, the first piston 2 is moved from the bottom side of the cylinder tube 1 to the rod side by a certain pressure or more. It has also been considered to provide a check valve for replenishing the hydraulic oil, and to replenish the leak of the pressure oil 9 via the check valve. In other words, elevator car 1
1 is manually lowered further below the lowermost reference position, and the pressure oil 9 sealed above the first piston 2 is lowered.
A negative pressure is generated on the pressure side, and the hydraulic oil is replenished from the check valve to the pressure oil 9 side in such a negative pressure state. In this manner, the elevator car 11 is further lowered below the lowermost reference position. In order to lower the lift, it is done manually, the operation of the elevator is temporarily stopped, the workability is poor, and the leaks into and out of the hydraulic elevator differ individually, the stroke correction cycle is constant However, there is a problem that the maintenance time is not constant and maintenance becomes troublesome.

The present invention has been made in view of such a problem, and an object of the present invention is to provide a check valve for replenishing the first piston with pressurized oil so that the elevator car can be moved to a lowermost position when the elevator car is not used. In order to provide a hydraulic elevator stroke correction method in which the hydraulic oil is replenished in a simple manner of lowering the operating system further below the reference position using a driving system to easily correct the hydraulic elevator stroke. is there.

[0006]

According to the present invention, a first piston 2 is provided in a cylinder tube 1 installed in a vertical direction so as to be able to move up and down, and a small-diameter tube 3 is extended from the first piston 2 to form a small-diameter tube. 3 is protruded from the upper end of the cylinder tube 1 so as to be able to change the protruding amount, and a second piston 4 is provided in the small-diameter tube 3 so as to be able to move up and down.
The piston rod 8 extends upward, the piston rod 8 protrudes from the upper end of the small-diameter tube 3 so as to be freely protruded, the through-hole 5 penetrates through the second piston 4, and the small-diameter tube 3 is inserted into and out of the small-diameter tube 3. A communication hole 6 for communicating the first piston 2 is formed in a lower portion of the cylinder tube 1.
Port 7 for introducing hydraulic oil for raising the pressure is formed,
Pressure oil 9 is sealed between the cylinder tube 1 and the small-diameter tube 3 and between the small-diameter tube 3 and the piston rod 8 at the upper part of the first piston 2. In a hydraulic elevator provided with a check valve 10 for replenishing hydraulic oil of a certain pressure or more on the side, an elevator car 11 connected to an upper end of a piston rod 8 is operated using an operation system further below a lowermost reference position. forcibly lowered Te, negative pressure is generated in the enclosed hydraulic fluid 9 side at a first upper piston 2, when the check valve 10 in such a negative pressure state to replenish the hydraulic fluid to the hydraulic fluid 9 side , To introduce hydraulic oil
And the negative pressure of the first piston 2
The operation is performed until the pressure on the pressure oil 9 side becomes equal .

[0007]

The elevator car 11 is further lowered from its lowermost reference position by using its operation system. A negative pressure is generated on the side of the pressurized oil 9 sealed in accordance with the descending amount. The hydraulic oil is replenished to the pressure oil 9 by the negative pressure. Then, replenish the hydraulic oil in the elevator operation system,
The stroke can be corrected, the maintenance of the elevator can be performed more easily than that performed manually, and the maintenance can be performed without stopping the operation of the elevator. And d
Top up hydraulic fluid to correct the lifter stroke
The elevator car 11 to the lowermost reference position.
To the first piston 2 side
A negative pressure is generated on the pressure oil side enclosed in the
Pressure of the chamber 14 on the port 7 side and the first piston
Until the pressure on the pressure oil 9 side, which is the negative pressure of 2, becomes equal
The replenishment of the hydraulic oil is completed on the port 7 side.
Connection between the chamber 14 and the negative pressure 9
Result can be easily determined,
Hydraulic fluid can be correctly and easily replenished.
You.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. As shown in FIG. 1, a first piston 2 is provided in a cylinder tube 1 installed in a vertical direction so as to be movable up and down. A small-diameter tube 3 extends from the first piston 2. A small-diameter tube 3 protrudes from the upper end of the cylinder tube 1 so as to be able to change the protruding amount. A second piston 4 is provided in the small-diameter tube 3 so as to be able to move up and down. A piston rod 8 extends upward from the second piston 4.
A piston rod 8 protrudes from the upper end of the small-diameter tube 3 so as to be able to change the protruding amount. A through hole 5 is penetrated through the second piston 4. The small-diameter tube 3 is provided with a communication hole 6 for communicating the inside and the outside of the small-diameter tube 3. A port 7 for introducing hydraulic oil for raising the first piston 2 is formed below the cylinder tube 1. And, between the cylinder tube 1 and the small diameter tube 3 above the first piston 2, and between the small diameter tube 3 and the piston rod 8.
And a pressure oil 9 is sealed between them. Further, the first piston 2 is provided with a check valve 10 for replenishing hydraulic oil of a certain pressure or higher from the bottom side of the cylinder tube 1 to the rod side.

In the above-described telescopic type hydraulic elevator, when the enclosed pressure oil 9 leaks inside and outside, the amount of the enclosed pressure oil 9 is reduced. a first piston 2 can not be secured a distance L ₂ between the second piston 4, when lowering the elevator car 11 to the reference position of the lowermost, second piston 4 collides with the first piston 2 shock However, in order to prevent such a shock from occurring, the amount of the leaked pressure oil 9 is replenished, and the replenishment is performed as follows.

That is, the elevator car 11 connected to the upper end of the piston rod 8 is forcibly lowered by using the operation system further below the lowermost reference position, and specifically, the pipeline on the port 7 side. Solenoid valve (not shown) provided in
To switch the oil from the port 7 to tank (not shown)
And the amount of descending of the elevator car 11 is determined by the timer until the detected position 11a such as the cam of the elevator car 11 contacts the position detection switch 12 or the return operation time of the solenoid valve. The load of the elevator car 11 is not applied to the first piston 2 because the set amount or the buffer 13 is hit, and the chamber 14 of the port 7 is
Until zero pressure is detected. That is, port 7
The pressure on the side of the chamber 14 is kept higher than the pressure of the sealed pressure oil 9. In this manner, a negative pressure is generated on the side of the pressure oil 9 sealed above the first piston 2, and the hydraulic oil is replenished from the check valve 10 to the side of the pressure oil 9 in the negative pressure state. This replenishment is performed until the pressure in the chamber 14 on the port 7 side becomes equal to the pressure on the pressure oil 9 side. Completion of the replenishment of the pressure oil 9 can be easily determined based on the detection result of the pressure of the chamber 14 and the pressure of the pressure oil 9. After such replenishment to the hydraulic fluid 9 side is performed, since L ₂ and back to the reference position of the lowermost (or the reference position of the other floors) based on a control program elevator car 11 is secured is there. And the upper margin stroke L ₃ >
By setting L ₁ + L ₂ = constant (constant), a shock at the upper floor can be avoided. In the case of a three-stage telescopic hydraulic elevator (hydraulic jack), L ₃ > constant (constant). In the figure, S ₁ indicates the stroke of the first piston 2, and S ₂ indicates the stroke of the second piston 4.

In order to automatically lower the elevator car 11 further below the lowermost reference position, a signal when the elevator car 11 is located at the lowermost reference position is used. This is performed by using a signal when the car 11 is located at a reference position other than the lowest stage, for example, when the elevator car 11 has been stopped on the second floor for a long time, and the stroke correction is performed based on the detection result. In addition, a timer can be incorporated in the control circuit, and the stroke can be corrected based on the set time of the timer. In this way, when performing stroke correction after a long stop at a specific floor, or when setting the timer to a time that is not used by people, the stroke correction can be performed without disturbing the user. You can do it.

[0012]

As described above, according to the present invention, the elevator car connected to the upper end of the piston rod is forcibly lowered by using the operation system further below the lowermost reference position, and the first piston A negative pressure is generated on the pressure oil side sealed above, and the hydraulic oil is replenished from the check valve to the pressure oil side in such a negative pressure state. It is further lowered, and a negative pressure is generated on the pressure oil side enclosed according to the amount of the drop, and the hydraulic oil is replenished to the pressure oil side by the negative pressure. , The stroke can be corrected, the maintenance of the elevator can be performed easily, and the operation can be performed without stopping the elevator operation. Moreover, the stroke of the elevator
When refilling hydraulic fluid to correct
Forcibly lower the basket further below the lowermost reference position.
The pressure oil side sealed down on the first piston side
To create a negative pressure in the
The pressure and the pressure on the hydraulic oil side, which is the negative pressure of the first piston, are
Until they are equal, and the replenishment of hydraulic oil is complete.
Is between the port side chamber and the negative pressure oil pressure.
Judgment can be easily made based on the detection
Refilling hydraulic oil for correctness can be done correctly and easily
There are advantages.

[Brief description of the drawings]

1A and 1B show an embodiment of the present invention, in which FIG.
(B) is a schematic sectional view of the entire elevator, and (c) is a schematic explanatory view showing the operation amount.

FIG. 2 is a sectional view of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylinder tube 2 1st piston 3 Small diameter tube 4 2nd piston 5 Through hole 6 Communication hole 7 Port 8 Piston rod 9 Pressure oil 10 Check valve 11 Elevator car

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B66B 9/04 F15B 15/14-15/16

Claims (1)

(57) [Claims] 1. A first piston is provided in a vertically installed cylinder tube so as to be movable up and down, a small diameter tube extends from the first piston, and the small diameter tube protrudes from an upper end of the cylinder tube so as to be capable of changing a projection amount. The second piston is provided in the small-diameter tube so as to be movable up and down.
A piston rod extends upward from the piston, the piston rod protrudes from the upper end of the small-diameter tube so as to be freely protruded, a through-hole is penetrated through the second piston, and a communication hole for communicating the inside and outside of the small-diameter tube with the small-diameter tube. A port is formed at a lower portion of the cylinder tube for introducing a hydraulic oil that raises the first piston, and is formed at an upper portion of the first piston between the cylinder tube and the small-diameter tube and between the small-diameter tube and the piston rod. In a hydraulic elevator in which pressurized oil is sealed and a first piston is provided with a check valve for replenishing hydraulic oil of a certain pressure or more from a bottom side of a cylinder tube to a rod side of a cylinder tube, an elevator car connected to an upper end of a piston rod is provided. The first piston is forcibly lowered using the operation system further below the lowermost reference position, and To generate a negative pressure in enclosed hydraulic fluid side in the above, when to replenish the hydraulic fluid to the hydraulic fluid side from the check valve in such a vacuum state, to introduce the hydraulic oil
The pressure in the chamber on the port side and the negative pressure in the first piston
A method of correcting a stroke of a hydraulic elevator, wherein the method is performed until pressures on a hydraulic oil side become equal .