JPH10318204A - Cylinder driving system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perfectly prevent the intrusion of foreign matter from outside even in the bad condition by connecting both rods of an input side cylinder and an output side cylinder having a different pressure receiving are to each other, and connecting both heads thereof to each other via respective pipelines. SOLUTION: In this driving system, when a piston rod 12 is pulled up, the oil at 1 liter is made to flow from a piston rod housing chamber (a rod side) 10 to a piston rod housing chamber 20 through a pipeline 3, and with this movement, the oil at 2 liters is made to flow from a piston rod non-housing chamber (a head side) 21 to a piston rod non-housing chamber 11 through a pipe line 4. Pressure receiving area is set to a ratio (pressure receiving effective area of a rod side piston surface):(pressure receiving effective area of a head side piston surface)=1:2. Consequently, this system can be perfectly sealed, and the intrusion of foreign matter from outside is perfectly prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylinder driving system.

[0002]

2. Description of the Related Art Many devices requiring a relatively large output such as forming an excavation hole in the ground employ a hydraulic drive system. Such a system is, for example, a mechanism for opening and closing a shell in a hammer shovel. Also used as.

A hydraulic drive system used for a shell opening / closing mechanism generally uses an electric motor and a hydraulic pump installed on the ground to transfer oil in an oil tank installed on the ground to the shell via a pressure-resistant hose. The shell is pressure-fed to two attached cylinders, and the shell is opened and closed by an advance / retreat force of an output shaft of the cylinder.

However, when the above-mentioned hydraulic drive system is adopted, there is a problem that the deeper the excavation hole, the longer the pressure-resistant hose becomes, and the energy loss is increased due to pipe resistance. In some cases, the energy loss is very large because the drilling hole may be as large as 100 meters, and the entire system becomes very large.

As a means for suppressing the energy loss, for example, a method in which the entire hydraulic drive system is provided near the shell to thereby shorten the oil transfer route can be considered. However, in this type of system, since an oil tank having an air vent hole is an essential component, when used under adverse conditions under the ground, a situation may occur in which moisture or the like enters the oil tank.

Accordingly, in recent years, there has been a demand for the development of a cylinder drive system that can completely prevent foreign substances from entering even under bad conditions.

[0007]

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a cylinder drive system capable of completely preventing foreign matter from entering even under bad conditions.

[0008]

The cylinder driving system according to the present invention comprises an input-side cylinder 1 on which an external force for moving the piston rod 12 retreats and an output-side cylinder on which the end of the piston rod 22 serves as an output section. 2 and the cylinder 1
The pipe line 3 for communicating and connecting the piston rod housing side chamber 10 of the cylinder 2 with the piston rod housing side chamber 20 of the cylinder 2 is connected to the piston rod non-housing side chamber 11 of the cylinder 1 and the piston rod non-housing side chamber 21 of the cylinder 2. A pipe 4 is provided, and the cylinders 1 and 2 and the pipes 3 and 4 are filled with a fluid.

[0009] In the above drive system, the fluid is a liquid (oil) or a gas.

The functions of the cylinder drive system according to the present invention will be clarified in the following embodiments of the present invention.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. [Embodiment 1] In this embodiment, a jack is constructed using a drive system of the present invention. As shown in FIG. 1, a piston rod 12 of a cylinder 2 is moved up and down by moving a piston rod 12 of a cylinder 1 up and down. A pedestal D attached to the end of the piston rod 22
Is raised and lowered.

Therefore, as shown in FIG. 1, the drive system comprises an input-side cylinder 1 on which an external force for moving the piston rod 12 retreats and an output-side cylinder 2 on which the end of the piston rod 22 serves as an output section. A pipe line 3 for connecting and connecting the piston rod receiving side chamber 10 of the cylinder 1 to the piston rod receiving side chamber 20 of the cylinder 2; a piston rod non-receiving side chamber 11 of the cylinder 1; And a pipe line 4 for communicating between the cylinders 1 and 2 and the pipe lines 3 and 4 are filled with oil.

In this drive system, although not shown, the rotational movement of the motor is converted into a reciprocating linear movement using a crank mechanism, and the converted reciprocating linear force F moves the piston rod 12 of the cylinder 1 up and down. I try to move it.

In this drive system, when the piston rod 12 is pulled up, for example, the piston rod receiving side chamber 10 is moved from the piston rod receiving side chamber 10 through the piping 3.
1 liter of oil flows to 20. Accordingly, 1 liter of oil flows from the piston rod receiving side chamber 21 to the piston rod receiving side chamber 11 via the pipe line 4. Therefore, regarding cylinders 1 and 2,
(Effective pressure receiving area of piston surface on piston rod side): (Effective pressure receiving area of piston surface on side without piston rod) = 1: 2. The ratio of the pressure receiving effective area is not limited to this.

Since this system is constructed as described above and is completely sealed, there is no possibility that foreign matter enters from outside. [Embodiment 2] In this embodiment, an opening / closing mechanism of a shell in a hammer shovel is constituted by using the drive system of the present invention. As shown in FIG.
The cylinder 2 is composed of two cylinders 2a and 2b, and piping paths 3a, 3b, 4a and 4b are also provided for the oil route.

In this drive system, the cylinder 1
The end of the piston rod 12 is connected to a weighted wire W suspended from, for example, a crane, and the piston W is moved up and down in a manner to move the wire W up and down. The operation of this system is basically the same as in the first embodiment, and will not be described.

When a hammer shovel using this drive system is used, even if the drilling hole is deep, it does not depend on the length of the oil route, so that it is possible to avoid an increase in the size of the entire system due to energy loss as in the prior art. . In addition, since this system is completely sealed, no foreign matter enters from outside. [Other Embodiments] In the first and second embodiments, the fluid is oil. However, the fluid is not limited to this, and may be a liquid or gas other than oil.

[0018]

Since the present invention has the above-described configuration, it has the following effects.

From the contents described in the embodiments of the invention, a cylinder drive system capable of completely preventing foreign matter from entering even under bad conditions can be provided.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a cylinder drive system according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram of a cylinder drive system according to a second embodiment of the present invention.

[Explanation of symbols]

 1 Cylinder 2 Cylinder 3 Piping path 4 Piping path 10 Piston rod receiving side chamber 11 Piston rod non-receiving side chamber 20 Piston rod receiving side chamber 21 Piston rod non-receiving side chamber

Claims (3)

[Claims] An input-side cylinder (1) to which an external force for moving a piston rod (12) is applied and an output-side cylinder (2) in which an end of the piston rod (22) is an output section.
And the piston rod receiving side chamber (1) of the cylinder (1).
0) and piston rod storage side chamber (20) of cylinder (2)
Pipe (3) for communicating and connecting the cylinder and the cylinder (1)
And a pipe line (4) for communicating and connecting the piston rod non-housing side chamber (11) of the cylinder (2) with the piston rod non-housing side chamber (21) of the cylinder (2). 3) A cylinder drive system characterized in that (4) is filled with a fluid. 2. The cylinder driving system according to claim 1, wherein the fluid is a liquid or a gas. 3. The drive system according to claim 2, wherein the liquid is oil.