Self-propelled pneumatic device

Abstract

The invention belongs to the technical field of pneumatics, and concretely relates to a self-driven pneumatic device. Left and right end covers with inlet and outlet valves are mounted on the two endsof a shell and form left and right cylinder cavities with a piston. Cover plates are mounted on the upper and lower sides of the shell. The cover plates press energy transducers into sinking cavitiesof the shell through sealing rings to form internal and external pump cavities. The cover plates press sealing rings into communicating cavities of the shell and form buffer cavities. Outlets are connected in series with the internal pump cavities to form internal pumps. Inlets are connected in series with external pump cavities to form external pumps. The internal and external pumps at the upperand lower sides of the shell are connected in series through the buffer cavities to form upper and lower air supply units. The upper and lower air supply units are connected in series through a pipeline. The outlet of the lower air supply unit is connected to left and right inlet valves. Each energy transducer consists of two drivers and washers. Each driver consists of a substrate and a piezoelectric sheet. Each driver contains driving and sensing units. The driving units are deformed by direct current driving voltage and drive voltage to reverse when output voltage of the sensing units reach an extreme value to realize self-excitation driving. The sensing voltage is also used for characterizing the motion speed and driving force of the piston.

Description

technical field [0001] The invention belongs to the technical field of pneumatics, and in particular relates to a self-driving pneumatic device. Background technique [0002] Hydraulic and pneumatic transmission and control 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. The traditional pneumatic power system is usually driven by a large electric motor and a mechanical air pump, and realizes the output force, speed and position through the joint operation of multiple types of valves such as reversing valves, pressure reducing valves and speed regulating valves. Therefore, the volume is large, 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, because the existi...

AI Technical Summary

Problems solved by technology

The traditional pneumatic power system is usually driven by a large electric motor and a mechanical air pump, and realizes the output force, speed and position through the joint operation of multiple types of valves such as reversing valves, pressure reducing valves and speed regulating valves. Therefore, the volume is large, 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, because the existing pneumatic power system adopts types A large number of air valves are jointly controlled, which makes it 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 various types of miniature hydraulic and pneumatic systems, such as Chinese patents 201510843026.7, 201310132556.1, 201410611173.7, etc., because the existing miniature hydraulic or pneumatic systems are driven by a fixed frequency, their driving force and speed in actual work It is greatly affected by the working load. When the resonant frequency of the driving element under specific working conditions deviates greatly from the set excitation frequency, the gas output and pressure will drop significantly. The driving force and speed accuracy are also low

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