Precise-displacement non-contact hydraulic cylinder

Abstract

The invention discloses a precise-displacement non-contact hydraulic cylinder. The precise-displacement non-contact hydraulic cylinder comprises a cylinder barrel, and a piston rod and a piston entering the cylinder barrel through a cylinder cover, a hollow hole passage is formed in the center of the piston rod, a position magnet is arranged at the head face, and the position magnet is isolated from the piston rod through a nonmagnetic gasket; a digital sensor is arranged at the bottom of the cylinder barrel, the digital sensor is provided with a displacement induction rod, the displacement induction rod enters the hollow hole passage, and the displacement induction rod and the hollow hole passage can generate non-contact axial relative displacement along with the move of the piston. Compared with the prior art, the precise-displacement non-contact hydraulic cylinder uses a built-in non-contact sensor instead of an original contact sensor and external displacement sensor, the oil cylinder uses zero-friction mounting, and the oil cylinder displacement is measured through the non-contact position magnet; the precise-displacement non-contact hydraulic cylinder has advantages of simple technique, precise displacement measuring and long service life.

Description

technical field [0001] The invention relates to the field of hydraulic oil cylinders, in particular to a precision displacement double-acting non-contact hydraulic oil cylinder. Background technique [0002] At present, the measurement of the stroke and displacement of the piston rod of the hydraulic cylinder is mainly through an external contact displacement sensor. There are two defects in actual use. First, the contact design causes the sensor to wear quickly due to friction and has a short service life. , the second external design is not suitable for use under harsh external conditions, such as high temperature, high pressure, high dust and high acid-base environment, and the second is directly exposed to the external environment, prone to mechanical damage; in summary, the existing The technology has the defects of short service life and poor environmental adaptability, which need to be improved. Contents of the invention [0003] The object of the present invention...

AI Technical Summary

Problems solved by technology

[0002] At present, the measurement of the stroke and displacement of the piston rod of the hydraulic cylinder is mainly through an external contact displacement sensor. There are two defects in actual use. First, the contact design causes the sensor to wear quickly due to friction and has a short service life. , the second external design is not suitable for use under harsh external conditions, such as high temperature, high pressure, high dust and high acid-base environment, and the second is directly exposed to the external environment, prone to mechanical damage; in summary, the existing The technology has the defects of short service life and poor environmental adaptability, which need to be improved

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