A self-propelled hydraulic cylinder

Abstract

The invention belongs to the hydraulic and pneumatic field and particularly relates to a self-driven hydraulic cylinder. An upper inlet, at least two first counter cavities, a second counter cavity and an upper outlet are formed in the upper portion of a cylinder block in sequence. A lower inlet, at least two first counter cavities, a second counter cavity and a lower outlet are formed in the lower portion of the cylinder block in sequence. Valve plates are bonded into the first counter cavities and the second counter cavities correspondingly. A piston partitions a cylinder block cavity into aleft cavity portion and a right cavity portion. Cover plates mounted on the upper and lower sides of the cylinder block can be used for pressing energy converters into the first counter cavities to form driving cavities correspondingly and pressing seal rings into the second counter cavities to form valve cavities correspondingly. The upper and lower inlets and outlets and the driving cavities and the valve cavities which are in series connection with the upper and lower inlets and outlets form upper and lower driving units correspondingly. An energy accumulator and a right valve I are mounted on the upper inlet through pipelines, and the right valve I is connected with the right cavity portion and is connected with the lower outlet through a right valve II. An energy accumulator and a left valve I are mounted on the lower inlet through pipelines, and the left valve I is connected with the left cavity portion and is connected with the upper outlet through a left valve II. Each drivingunit is provided with one energy accumulator with a driving unit portion and a sensing unit, and when the driving unit portions deform to enable the voltage of the sensing units to reach a limit value, the voltage is driven to be commutated.

Description

technical field [0001] The invention belongs to the field of pneumatic technology, and in particular relates to a self-driving hydraulic cylinder. Background technique [0002] Hydraulic and pneumatic systems have the advantages of high energy density, low noise, and no impact, and have been successfully used in various industries in the national economy and defense industry for many years. Traditional hydraulic and pneumatic systems are usually driven by large electric motors and mechanical pumps, and through the combined operation of multiple types of valves such as reversing valves, pressure reducing valves, and speed regulating valves, the output force, speed, and position are realized. Therefore, the volume is huge, the structural connection and control are relatively complicated, and the application has great limitations: it cannot be used in aerospace, walking robots and other micro systems and remote control systems; at the same time, due to the existing hydraulic an...

AI Technical Summary

Problems solved by technology

Traditional hydraulic and pneumatic systems are usually driven by large electric motors and mechanical pumps, and through the combined operation of multiple types of valves such as reversing valves, pressure reducing valves, and speed regulating valves, the output force, speed, and position are realized. Therefore, the volume is huge, the structural connection and control are relatively complicated, and the application has great limitations: it cannot be used in aerospace, walking robots and other micro systems and remote control systems; at the same time, due to the existing hydraulic and pneumatic systems. A wide variety of servo valves are jointly controlled, and it is difficult to achieve precise control and adjustment of driving force, speed and position, and cannot be used in fields requiring high driving, positioning and control precision, such as precision machining and assembly, precision measurement, and precision optical drive.

Therefore, people have successively proposed a variety of micro-hydraulic or pneumatic systems based on piezoelectric transducers, but because these new systems are driven by fixed frequencies, their driving force and speed are greatly affected by the load. When the deviation of the set excitation frequency is large, the output force and speed will be greatly reduced, and the accuracy of the drive force and speed calculated according to the set drive voltage and frequency is also low

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