KR910008012Y1 - Loader - Google Patents

Abstract

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Description

A nonpowered descender

1 is a schematic configuration diagram of the descender of the present invention.

2 is the operation of the cargo lowering.

3 is an operation diagram when the load plate is raised.

* Explanation of symbols for main parts of the drawings

C1: Actuating Clinder C2: Actuating Crlinder

P1: Driving piston P2: Operating piston

W: Cargo w: Dummy weight

L1: Leveler (carrying) L2: Leveler (carrying)

△ H: Level difference 1: Conduit

2: loading plate 3: variable orifice (可變 oritice)

The present invention relates to a non-power descender (descender), and more particularly to a non-power down machine using the weight of the cargo.

Hoists, lifters, or elevators were used as vessels to unload or move cargo at high levels from factories or warehouses to low levels. It is a type that uses a large power consumption, and to implement so-called factory automation (FA), such as an unmanned factory or an unmanned warehouse, there was a problem that requires a complicated device configuration for the remote operation.

The present invention, in view of the above-mentioned problems, the object of the lowering of the load, but does not consume the power to return the load plate, the speed can be adjusted, as well as to provide a non-powered lowering machine that is easy to remote operation.

In order to achieve the above object, the present invention is a non-powered lowering device having a load plate on which cargo is loaded, and an operating cylinder having a cross-sectional area A2 for accommodating an operating piston moving up and down by a stroke of the level difference between two levels to which the cargo is to be transported. And a driving cylinder accommodating the driving piston having a weight installed therein and having a small cross-sectional area A1 with a cross-sectional area of the working cylinder, and a conduit provided with a valve connecting the working cylinder and the driving cylinder to open and close the pipe. It is characterized by.

Hereinafter, with reference to the accompanying drawings, a preferred embodiment of the non-powered down according to the present invention will be described in detail.

The non-powered lowering device according to the present invention shown in FIG. 1 is composed of a driving cylinder C1 having a cross-sectional area A1 and an operating cylinder C2 having a cross-sectional area A2 (stage A2> A1), which is coupled with a conduit 1. A load plate on which a driving piston P1 of a stroke S1 provided with a weight W having a weight W is mounted on the drive cylinder C1, and a load 9 W of load W is loaded on the working cylinder C2. The actuating piston P2 of the stroke S2 on which the loading plater 2 is installed is accommodated freely in the vertical motion, and in the middle of the conduit 1, a valve V for opening the pipe and a cross-sectional area of the pipe A3 Each variable orifice 3 is provided. In addition, the driving cylinder C1, the working cylinder C2, and the conduit 1 are filled with a working fluid suitable for pressure transmission. The stroke S2 of the working piston P2 is configured to be equal to the level difference ΔH between the level L1 to which the cargo W is to be transported and the level L2 to be transported, and thus the driving piston P1. The torque S1 of) becomes S2 * A2 * / A1 by the continuous law of fluid.

The valve (V) and the variable orifice (3) may be integrally formed, and the valve (V) is a remote control valve by a solenoid or the like, and the variable orifice (3) may also be a remote operation type such as a cone type. It is preferable for the unmanning of the powerless descender according to the present invention. Alternatively, the vane V may be connected to a timer to open at a predetermined interval.

Hereinafter, the operation of the non-powered lowering device according to the present invention will be described in detail with reference to FIGS. 2 and 3. (In the following description, the self-weight of the operating piston P2 or the driving piston P1 is ignored.)

First, if the load (W) is loaded on the load plate (2) of the working piston (P2) at the same level at the level L1 with the valve (V) closed, then the lower working piston (P2) from the conduit (1) level When h2 is the liquid column, the conduit 1 receives the pressure of W + ρ * g * h2 (where ρ is the working fluid density and g is the acceleration of gravity). Is blocked, so the load plate 2 does not descend.

Next, when the valve V is opened by operating the solenoid or the like, the working fluid passes through the valve V and moves to the driving cylinder C1 side, so that the load plate 2 directly loaded with the cargo W starts to descend. This state is the state of FIG.

At this time, the equilibrium equation of the force of the driving cylinder C2 and the working cylinder C1 is equal to the positive pressure at both bottoms, that is, W + δ * g * a1 = W + ρ * g * h2 * A2 Until this is satisfied, the operating piston P2 is lowered, the operating piston P2 is lowered, and the descending speed V2 of the operating piston P2 can be obtained as follows.

If the pipe cross-sectional area of the variable orifice 3 is A3, and the driving cylinder C1 is the liquid column h1, Bernoulli's theorem (the dynamic pressure of the driving piston P1 and the working piston P2 is The static pressure difference across both sides of the variable orifice 3 becomes the dynamic pressure of the working fluid passing through the variable orifice 3.

1/2 * ρA3 * V3 ² = (W + ρ * g * h2)-(W + ρ * g * h1) and also by the continuous law

A3 * V3 = A2 * V2... … … … (3)

therefore

… … … … … … (3 ')

Therefore, when V3 is obtained from Equation (2), V2 can be obtained from Equation (3 '), where the descending speed V2 of the working piston P2 is proportional to the cross-sectional area A3 of the variable orifice 3, so that the variable orifice is By changing the cross-sectional area (A3) of (3) it is possible to adjust the falling speed (V2) of the working piston (P2).

In the formula (2), as the difference between the two liquid lines h1 and h2 decreases, the conduit passing speed V3 of the working fluid is gradually lowered, and thus the lowering speed V2 of the working piston P2 is also lowered. The descending speed (V2) obtained from becomes the maximum speed, and in order to make the descending speed (V2) constant, the cross-sectional area (A3) of the cross-sectional area (A3) of the variable orifice (3) may be gradually increased in accordance with the descending.

When the lowering of the load plate 2 is completed and the lower level L2 is reached, the valve V is blocked to prevent the flow of the load plate 2 and the cargo W is unloaded.

When the valve V is opened after the unloading is completed, the load plate 2 starts to rise to the level L1 again, which is the state shown in FIG.

At this time, the force that raises the load plate 2 is due to the difference in the fluid force applied to both cylinders (C1, C2).

W + ρ * g * h 2 * V 3 = A 2. … … … … (4)

Therefore, the operating piston (P2) is raised until this condition is satisfied, the rising speed (V2) of the operating piston (P2) can be obtained as follows.

1/2 * ρ * A3 * V3 ² = (W + ρ * g * h1) -ρ * g * h2... … (5)

When V3 is provided in Equation (5), V2 can be obtained from Equation (3 '). As shown in the lowering process, the ascending speed V2 of the load plate 2 is equal to the cross-sectional area of the variable orifice 3. In order to make the ascending speed V2 constant, the cross-sectional area A3 of the variable orifice 3 may be gradually increased in accordance with A3).

In the above description, the driving cylinder and the operation cylinder have been described as one each, but a plurality of driving cylinders may be installed to reduce the stroke of the driving cylinder, or a plurality of driving cylinders may be installed to lower a plurality of cargoes.

In addition, the non-powered lowering device according to the present invention is not only a simple lowering device, but also a plurality of driving cylinders are installed to selectively open a suitable level driving cylinder according to the weight of the cargo loaded on the load plate, thereby loading the cargo from a low level to a high level. It can also be used as a lifter.

As described above, the non-powered descent machine of the present invention can lower the cargo and return the load plate without using separate power, thereby saving energy, and the remote operation can be easily performed, which can contribute to the unloading or factory automation. It is a useful design.

Claims (2)

A working piston P2 having a load plate 2 on which the cargo W is loaded and moving up and down by the stroke 9S2 by the level difference ΔH between the two levels L1 and L2 to which the cargo W is to be transported. Drive having a cross-sectional area A1 smaller than the cross-sectional area A2 of the operation cylinder C2, and storing the operation cylinder C2 of the cross-sectional area A2 and the driving piston P1 in which the weight W is installed. And a conduit (1) configured to connect a cylinder (C1), the operation cylinder (C2) and the driving cylinder (C1), and a valve (V) for opening and closing the conduit. The non-powered lowering device according to claim 1, wherein a variable orifice (3) is installed in the conduit (1) for adjusting the cross-sectional area (A3) of the conduit.