Mechanical design method and structure of double-acting energy-saving cylinder

Abstract

For double-acting cylinders, the invention provides a theoretical basis and method for computing, checking and selecting the ratio of the diameter d of a cylinder piston rod to the diameter D of a piston based on the return power required by a cylinder. As the strength, stiffness and pressure bar stability theory in classic material mechanics is abandoned, the ratio of d to D of the cylinder designed according to the method of the invention is greatly increased to 80 to 98 percent from 15 to 30 percent of the conventional double-acting cylinder; return stroke energy consumed is about 91 to 97.75 percent of total operation stroke energy consumed, 4 to 36 percent of operation stroke energy consumed is correspondingly reduced, and energy is greatly saved. The mechanical design method and structure can provide a novel pneumatic actuating element which is energy-saving, environmentally friendly, and high in production efficiency and universality degree, for relevant files of national economy.

Description

technical field [0001] The invention relates to the field of cylinders, and mainly relates to a mechanical design method and structure of a double-acting energy-saving cylinder. Background technique [0002] The existing mechanical design method of the ratio of the piston rod diameter d to the piston diameter D of the double-acting cylinder is based on the strength, stiffness and pressure rod stability theory of material mechanics. The ratio of piston rod diameter d to piston diameter D designed according to the above theory is generally in the range of 15% to 30%; small cylinders are generally about 30%, and large and medium cylinders are generally 15% to 20%. Assuming that the rated pressure of the system is p, the force of the working stroke of the cylinder is F 1 =πD 2 p / 4, return stroke force F 2 =π(D 2 -d 2 )p / 4. For example, if d / D=0.20, then the ratio of the return stroke force to the work stroke force is F 1 / F 2 =(D 2 -d 2 ) / D 2 =[D 2 -(0.2D) 2 )] / D 2...

AI Technical Summary

Problems solved by technology

[0005] Such a large return force redundancy and energy waste in traditional cylinders not only consume energy uselessly, but also generate a large return impact force and noise pollution

Generally speaking, the end cover of the existing double-acting cylinder needs to be equipped with a buffer device with a very complicated structure, and the outlet of the reversing valve needs to be equipped with a muffler.

This undoubtedly increases the manufacturing cost accordingly.

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