Pressure-maintaining push-pull cylinder and clamping device using the same

Abstract

The invention provides a pressure-maintaining push-pull cylinder, comprising an oil cylinder and a nitrogen cylinder fixed at the end of the oil cylinder; an oil inlet communicated with a rod cavity of the oil cylinder is formed on the side wall of the oil cylinder; a piston rod of the nitrogen cylinder is communicated with a non-rod cavity of the nitrogen cylinder; and a gas inlet communicated with the non-rod cavity of the nitrogen cylinder is formed on the nitrogen cylinder. The invention provides a clamping device, comprising a fixed seat, a connecting rod, a pressing rod and a pressure-maintaining push-pull cylinder; the pressure-maintaining push-pull cylinder is vertically fixed on the fixed seat; the head of the connecting rod is hinged on the fixed seat and the tail is hinged at the middle part of the pressing rod; the output shaft of the pressure-maintaining push-pull cylinder is hinged at the tail of the pressing rod; and a holding part for holding workpieces is formed between the head of the pressing rod and the upper surface of the fixed seat. The pressure-maintaining push-pull cylinder and the clamping device using the pressure-maintaining push-pull cylinder are simple in structure, convenient in processing, stable in running, high in output power, safe and reliable, saved in energy source and have no pollution.

Description

technical field [0001] The invention relates to a tooling fixture, in particular to a pressure-maintaining push-pull cylinder and a clamping device for its application. Background technique [0002] With the continuous advancement of science and technology, the requirements for clamps in the industrial field are getting higher and higher. It is required that the clamps not only meet the various needs of the mechanical structure, but also require the miniaturization and high performance of the clamp components. Conventional clamp elements used in the prior art, such as single-action clamps (hydraulic or pneumatic clamp, spring force release), double-action clamps (hydraulic or pneumatic clamp, spring force release) and hydraulic Loosening spring clamping, etc. At present, the clamps used in various industries in various countries in the world are mainly pneumatic and hydraulic. The clamping force of the pneumatic clamp is small, and the hydraulic clamp needs to continuously ...

AI Technical Summary

Problems solved by technology

[0003] Nitrogen is an inert gas, non-toxic, non-corrosive, non-combustible, safe and reliable, but the density of nitrogen is very small, the internal pressure of the nitrogen spring increases, the load pressure of the seal sealing nitrogen increases, and the pressure difference between the external atmospheric pressure increases Large, the sealing of nitrogen gas under high temperature and high pressure is a very difficult key technical problem, the manufacturing cost is high, the control of nitrogen system is also very unstable, and the problem of temperature change control is also difficult to solve. At the same time, with high-speed movement, the lubrication performance decreases

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