2results about How to "Avoid fatigue cracking" patented technology

This utility model relates to the field of hydraulic cylinder technology, specifically to a telescopic cylinder for a roadheader, comprising a cylinder body with a cavity inside. A piston rod is disposed within the cavity, with its end extending out of the cylinder body. A spacer block with several through holes is located at the bottom of the cavity. A piston is disposed at the bottom of the piston rod and is slidably connected to the inner wall of the cylinder body. A piston seal is also provided on the outer wall of the piston. A limiting sleeve is provided at the top of the piston and is fitted onto the piston rod. A guide sleeve is provided at the end of the cylinder body, through which the piston rod passes. This utility model effectively prevents deformation of the telescopic cylinder and improves the stability and reliability of cylinder operation.

The utility model relates to a kind of high toughness base for machine tool, including base body, the hollow setting is formed cavity in the base body, multiple first support plate and multiple second support plate are crossly set in the cavity, rectangular slot is set in the first support plate and second support, and the four feet of the rectangular slot are rounded corner settings.A kind of high toughness base for machine tool of the utility model, by setting multiple first support plate and multiple second support plate, the strength of base is guaranteed by supporting base, and rectangular slot is set to reduce the weight of base, and inside angle uses rounded corner transition, force transmission becomes smooth, stress peak is eliminated, fatigue crack and sudden fracture of part under alternating load can be effectively prevented, the reliability and life of product are greatly improved, the root of stress concentration of sharp corner is solved, and the problem that effective fatigue strength and impact toughness of structure can be greatly reduced.