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Variable-speed hydraulic cylinder

A technology of hydraulic cylinders and cylinder barrels is applied in the field of variable-speed hydraulic cylinders, which can solve the problems of inability to realize rapid retraction of hydraulic cylinders and limited functions, and achieve the effects of high working efficiency, fast driving speed and wide adaptability.

Active Publication Date: 2015-07-29
XUZHOU HEAVY MASCH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Although this type of hydraulic cylinder can easily adjust the extension speed according to different working thrusts, it can only be retracted at a fixed speed, and cannot realize the rapid retraction function of the hydraulic cylinder, and its functions are relatively limited.

Method used

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Embodiment Construction

[0032] The content of the present invention will be described in detail below. In the following paragraphs, different aspects of the embodiments are defined in more detail. Aspects so defined may be combined with any other aspect or aspects unless specifically stated otherwise. In particular, any feature which is considered to be preferred or advantageous may be combined with one or more other features which are considered to be preferred or advantageous.

[0033] Terms such as "first" and "second" appearing in the present invention are only for convenience of description, to distinguish different components with the same name, and do not indicate a sequence or a primary and secondary relationship.

[0034] In the actual work of the hydraulic cylinder, there is no load or the load is very small when it is in certain working conditions, which can be called the auxiliary stroke. The stroke that the hydraulic cylinder pushes the load to work in the actual work is the load stroke...

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Abstract

The invention relates to a variable-speed hydraulic cylinder, which comprises a barrel, a first piston rod assembly and a second piston rod assembly, the first piston rod assembly comprises a piston rod and a first piston which are connected with each other, and the second piston rod assembly comprises a guide rod and a second piston which are connected with each other; the piston rod partially extends out of the barrel, the first piston is arranged in the barrel, and can slide along the inner wall of the body of the barrel, the piston rod is provided with a hollow structure, the guide rod partially extends out of the hollow structure and passes through the first piston to fixedly connect with the bottom of the barrel, and the second piston is arranged in the hollow structure, and can slide along the inner wall of the hollow structure; the variable-speed hydraulic cylinder is provided with a plurality of working oil ports, the working oil ports respectively communicate with four closed cavities defined in the variable-speed hydraulic cylinder, and by injecting hydraulic oil into the different closed cavities, the first piston rod assembly can extend and retract at different speeds. The variable-speed hydraulic cylinder disclosed by the invention can meet different requirements on extension and retraction speeds.

Description

technical field [0001] The invention relates to the field of hydraulic technology, in particular to a variable speed hydraulic cylinder. Background technique [0002] A hydraulic cylinder is an energy-converting hydraulic actuator that converts hydraulic energy into linear motion mechanical work. It is generally composed of a cylinder, a piston, and a piston rod. When the hydraulic cylinder is filled with oil through the oil port, the piston rod is stretched out or retracted into the cylinder body under force, generating thrust or pulling force to complete work. Since the cross-sectional area of ​​the cylinder and the piston rod is constant, the piston rod will not change the pressure area and oil flow according to the change of the external force during the pushing process. When the load resistance is small, the movement speed of the piston rod is still the same as when the load is large, and the pushing speed is slow and the efficiency is low. [0003] In some working co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F15B15/16F15B15/20
CPCF15B15/16F15B15/20
Inventor 朱涛曾博泰赵瑞学朱凤刘广兴
Owner XUZHOU HEAVY MASCH CO LTD
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