Oil cylinder of static pressure vibration exciter

Abstract

The invention discloses an oil cylinder of a static pressure vibration exciter, which is characterized in that the two ends of a piston are respectively fixedly connected with a piston rod, and each piston rod stretch out of an inner cavity of a cylinder barrel; the transverse section of a static-pressure bearing is in the shape of a circular ring, the outer wall of each static-pressure bearing is axially provided with annular external oil grooves at certain intervals, the inner wall of the static-pressure bearing is axially provided with annular internal oil grooves, and each annular external oil groove is correspondingly communicated with an annular external oil groove by a first through hole; an end cover is axially provided with a second through hole; the piston rods respectively correspondingly pass through a static pressure bearing, and the static pressure bearings are respectively fixedly connected with an end cover, the two ends of the cylinder barrel are respectively arrangedin a big hole of the second through hole of a corresponding end cover, and the two end covers are fixedly connected by lock bolts; and the shell of each end cover is provided with an oil inlet and a corresponding oil outlet, one of two adjacent annular external oil grooves is communicated with the corresponding oil inlet, and the other annular external oil groove is communicated with the corresponding oil outlet. The oil cylinder disclosed by the invention can resist large lateral forces, and reduce the friction between the piston and the static-pressure bearings.

Description

technical field [0001] The invention relates to a static pressure vibration exciter oil cylinder ， It can be widely used in the fields of single-degree-of-freedom and multi-degree-of-freedom hydraulic vibration tables, and also has related applications in some aerospace products and metallurgical industries. Background technique [0002] Ordinary servo exciter cylinders are widely used in hydraulic vibration tables. For ultra-high-frequency high-thrust hydraulic vibration tables, the piston and piston rod of the exciter cylinder perform high-speed reciprocating motion together, and at the same time, they must bear large lateral forces. The force makes the friction between the piston, piston rod and the cylinder wall and seal intensifies, and the external leakage of the hydraulic system increases, so the repeatability of the test is poor. Chinese patent CN11877140A discloses a hydrostatic support-guided hydraulic cylinder, which has four rectangular oil chambers on the inner...

AI Technical Summary

Problems solved by technology

[0002] Ordinary servo exciter cylinders are widely used in hydraulic vibration tables. For ultra-high-frequency high-thrust hydraulic vibration tables, the piston and piston rod of the exciter cylinder perform high-speed reciprocating motion together, and at the same time, they must bear large lateral forces. The friction between the piston, the piston rod and the cylinder wall and the seal intensifies, and the external leakage of the hydraulic system increases, so the repeatability of the test is poor.

Chinese patent CN11877140A discloses a hydrostatic support-guided hydraulic cylinder, which has four rectangular oil chambers on the inner wall of the hydrostatic bearing and four oil return grooves along the axial direction, so that after the oil enters the oil chamber, it will The oil returns along the axial oil sealing surface and the radial oil sealing surface at the same time, forming an oil film with a certain rigidity. This design can reduce friction to a certain extent, but due to the radial oil return in this design, the piston rod reciprocates at high frequency. At the same time, there is a phenomenon of oil leakage between the oil chambers, and the phenomenon of turbulent flow occurs in the fluid movement, so the lateral force resistance of the piston rod is greatly reduced, and the phenomenon of "shaft holding" may occur, thereby damaging the oil cylinder, which cannot meet the high frequency requirements. Thrust multi-degree-of-freedom hydraulic vibration table requirements

So far, there is no static pressure exciter cylinder using this static pressure bearing structure in China

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