Low-flow fast movable cylinder

Abstract

The invention discloses a low-flow fast movable cylinder which comprises a cylinder barrel, a piston, a piston rod and a plunger. Both the piston rod and the plunger are hollow, an inner cavity of the cylinder barrel is divided into a first oil storage cavity and a second oil storage cavity by the piston, one end of the piston rod is fixedly connected with a side surface of the piston, and the other end of the piston rod is connected with a side wall of the first oil storage cavity in a sliding fit manner; one end of the plunger is fixedly connected with a side wall of the second oil storage cavity, the other end of the plunger is connected with the piston in a sliding fit manner and extends into a hollow cavity of the piston rod, an opening is arranged on the plunger, a hollow cavity of the plunger is communicated with the hollow cavity of the piston rod via the opening, so that a third oil cavity is formed between the piston rod and the plunger; and a third oil port, a second oil port and a first oil port which are respectively communicated with the hollow cavity of the plunger, the second oil storage cavity and the first oil storage cavity are arranged on the wall of the cylinder barrel. By the aid of the cylinder, oil cylinders with equal speeds and oil cylinders with different speeds can be switched mutually, flow of the cylinders with the equal speeds and flow of the cylinders with different speeds in a hydraulic system are matched, and the low-flow fast movable cylinder can be applied to working places with requirements on high-speed movement and high thrust.

Description

technical field [0001] The invention relates to an oil cylinder, in particular to a small-flow fast-moving oil cylinder. Background technique [0002] Commonly used oil cylinders have the following problems: On the one hand, when the bore of the oil cylinder is large, a large flow rate is required to move the cylinder quickly, so a pump with a large flow rate is required to supply oil, which will lead to high configuration costs and complicated pipelines , and it is necessary to increase the switching circuit; on the other hand, when the rated displacement is constant, the oil cylinder cannot switch between various moving speeds by changing the oil circuit. [0003] For example, the publication date is September 14, 2011, and the Chinese invention patent application with the publication number CN102182720A discloses a two-speed oil cylinder, although the two-speed oil cylinder realizes the thrust through the pressure areas of different sizes of the moving piston rod and the ...

AI Technical Summary

Problems solved by technology

[0002] Commonly used oil cylinders have the following problems: On the one hand, when the bore of the oil cylinder is large, a large flow rate is required to move the cylinder quickly, so a pump with a large flow rate is required to supply oil, which will lead to high configuration costs and complicated pipelines , and it is necessary to increase the switching circuit; on the other hand, when the rated displacement is constant, the oil cylinder cannot switch between various moving speeds by changing the oil circuit

[0003] For example, the publication date is September 14, 2011, and the Chinese invention patent application with the publication number CN102182720A discloses a two-speed oil cylinder, although the two-speed oil cylinder realizes the thrust through the pressure areas of different sizes of the moving piston rod and the large piston. The change can make the push speed and retraction speed of the oil cylinder faster when using a smaller pressure receiving area, but the structure of the two-speed oil cylinder is more complicated and not easy to process, and according to the setting structure of its oil circuit, the One end of the two-speed oil cylinder is connected to the oil tank. The main function of the oil tank is the oil return storage container of the working chamber. The pressure bearing capacity is less than 1MPA, so the oil circuit connected to the oil tank can only bear the working pressure less than 1MPA.

In addition, the design of the oil port channel of this two-speed oil cylinder cannot realize the mutual conversion between the constant speed and differential speed oil cylinders and the problem of flow matching in the constant speed and differential speed oil cylinders in the hydraulic system

Images