JPH09280202A - Pneumatic-hydraulic cylinder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To integrally form an apparatus and a device, reduce size, and simplify a mounting and a handling method by a method wherein a concentric and single wall cylinder tube is arranged on the outside of the cylinder tube and a space between the two cylinder tubes forms a pneumatic - hydraulic converter. SOLUTION: A pneumatic-hydraulic cylinder is constituted by a cylinder tube 1, a cylinder tube 2 is concentric to and positioned outside the cylinder tube 1, and these two cylinder tubes constitutes a pneumatic - hydraulic converter in cooperation with a free piston 5. The effective volume thereof, i.e. the volume of a cylinder chamber 6 is set to be larger than that of the pneumatic - hydraulic cylinder. A feed and exhaust port 10 to the pneumatic - hydraulic cylinder and a feed and exhaust port 11 to the pneumatic - hydraulic converter are formed in a rod cover 7 and a connection passage 12 between the pneumatic - hydraulic converter and the pneumatic - hydraulic cylinder is formed in a heat cover 8. This constitution reduces size, simplifies a mounting and a handling method, and facilitates incorporation of an apparatus, having a demanded function, in the middle of the connection passage 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pneumatic-hydraulic cylinder which can obtain the respective characteristics of a pneumatic cylinder and a hydraulic cylinder.

[0002]

2. Description of the Related Art When a conventional pneumatic-hydraulic cylinder is used, the hydraulic pressure generated by a separate pneumatic-hydraulic converter is supplied to the cylinder. In addition, a hydraulic check cylinder, which is one type of hydraulic cylinder, is mechanically connected to a normal pneumatic cylinder to compensate for instability such as speed control and intermediate stop due to the compressibility of air. Have the same purpose.

Since a plurality of devices are used in this way,
It requires piping and mechanical coupling equipment, and requires a large space for installation.

[0004]

The problem to be solved by the present invention is to integrate the equipment and devices required for the pneumatic-hydraulic cylinder into a single unit, and to make it compact and easy to install and handle. .

[0005]

A space between two concentric cylinder tubes is used as an air pressure-hydraulic pressure converter, and an air pressure supply / exhaust port for the cylinder is also supplied with air pressure / exhaust pressure for the air pressure-hydraulic pressure converter. The mouth is also provided on the rod cover of the cylinder, and the head cover of the cylinder is provided with a connection passage between the pneumatic-hydraulic converter and the cylinder. Therefore, the piping between the conventional pneumatic-hydraulic converter and the pneumatic-hydraulic cylinder is not required, and the size is smaller than that of tandemly arranging them or arranging them in parallel. Further, since it is sufficient to provide only the connecting passage in the head cover of the cylinder, it is easy to incorporate a device having a necessary function for the pneumatic-hydraulic cylinder, depending on the requirement.

[0006] Examples of the built-in devices include a pneumatic-hydraulic pressure booster capable of increasing the output of the cylinder by increasing the hydraulic pressure, and a speed control valve for speed control. Also, by incorporating a switching valve, it is possible to make the intermediate stop of the stroke accurate.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an example of the basic configuration of the present invention. The cylinder tube 1 constitutes a pneumatic-hydraulic cylinder together with the piston 3 and the piston rod 4. Cylinder tube 2
Is concentric with the cylinder tube 1 and is on the outer side, and constitutes a free piston 5 and an air pressure-hydraulic pressure converter. The effective volume of the air pressure-hydraulic pressure converter, that is, the volume of the cylinder chamber 6 is the air pressure-
It is made larger than the effective volume of the hydraulic cylinder, that is, (cylinder diameter x total stroke). The rod cover 7 and the head cover 8 are shared by the pneumatic-hydraulic cylinder and the pneumatic-hydraulic converter. Both covers 7 and 8 are tie rods 9.
The cylinder tubes 1 and 2 are sandwiched by and tightened. The rod cover 7 has an air supply / exhaust port 10 for the air pressure-hydraulic cylinder and an air supply / exhaust port 11 for the air pressure / hydraulic pressure converter.
Is provided. The head cover 8 is provided with a connection passage 12 between an air pressure-hydraulic pressure converter and an air pressure-hydraulic cylinder.

The present invention is not only compact and easy to install and handle, but also the connecting passage 12 of the head cover 8 is provided.
It also has the feature that it is easy to incorporate equipment that fulfills the required functions in the middle of the above. FIG. 2 shows the basic structure of the pneumatic-hydraulic cylinder of FIG.
Is an example of incorporating. The output of the cylinder may be small during the stroke of the clamp device or the like, but it is used when a large force is required during clamping. When air pressure is supplied to the air pressure supply / exhaust port 14 of the air pressure-hydraulic pressure booster by signals such as detection of the position of the piston rod 4 and detection of the reaction force, the hydraulic pressure increased by the ratio of the piston 15 and the plunger 16 is increased. In addition to 3, it becomes a large cylinder force.

FIG. 3 shows a speed control valve 17 for speed control.
Is an example of incorporating.

[00010]

As described above, the pneumatic-hydraulic cylinder of the present invention is small in size and can be easily attached to a machine / apparatus using the same and can be handled easily, and in addition, a device having a required function can be easily incorporated. be able to. Therefore, the application range of the pneumatic-hydraulic cylinder can be expanded.

[Brief description of drawings]

FIG. 1 is an example of a basic configuration of a pneumatic-hydraulic cylinder of the present invention.

FIG. 2 shows an example in which a pneumatic-hydraulic pressure booster is incorporated in the pneumatic-hydraulic cylinder basic configuration of the present invention.

FIG. 3 shows an example in which a speed control valve is incorporated in the basic structure of the pneumatic-hydraulic cylinder of the present invention.

[Explanation of symbols]

 1 ... Cylinder tube 2 ... Cylinder tube 3 ... Piston 4 ... Piston rod 5 ... Free piston 6 ... Pneumatic-hydraulic converter cylinder chamber 7 ... Rod cover 8 ...・ Head cover 9 ・ ・ ・ Tie rod 10 ・ Air pressure-supply / exhaust port to hydraulic cylinder 11 ・ ・ Air pressure-supply / exhaust port to hydraulic converter 12 ・ ・ Connecting passage 13 ・ ・ Booster 14 ・ ・ Supply to booster Exhaust port 15 ・ ・ Booster of pressure booster 16 ・ ・ Plunger of pressure booster 17 ・ ・ Speed control valve

Claims (1)

[Claims] 1. An air pressure is supplied to one side of a cylinder chamber divided by a piston and a hydraulic pressure is supplied to the other side to apply pressure to the piston, and the output of this piston is used to work outside by a piston rod. In a cylinder, a single cylinder tube is concentrically provided outside the cylinder tube of this cylinder, and a space between these two cylinder tubes is used as an air pressure-hydraulic pressure converter.