Hydraulic oil cylinder, hydraulic oil circuit, material pumping system, and engineering machinery

Abstract

The invention provides a hydraulic oil cylinder used for a material pumping system. The hydraulic oil cylinder comprises a cylinder barrel, a piston and a piston rod installed in the cylinder barrel; two ends of the cylinder barrel are sealed by a first end cover and a second end cover; one end of the piston rod is arranged on the piston while the other end of the piston rod passes through the first end cover; the inner part of the cylinder barrel is divided into a first cavity and a second cavity by the piston; the invention also comprises a limit piston and a limit piston fixing rod, wherein one end of the piston rod is provided with a blind hole in which the limit piston fixing rod can be inserted; the limit piston can reciprocate on the limit piston fixing rod. The invention also provides a hydraulic oil circuit, a material pumping system and an engineering machinery. According to the technical scheme of the invention, the length of the hydraulic oil cylinder is effectively shortened, the installation space of the pumping system is reduced, the manufacture of the hydraulic oil cylinder and connection of oil pipes are facilitated, the concrete pistons are more convenient and faster to clean and replace, and the continuity of the cement pumping work and the production efficiency are enhanced remarkably.

Description

technical field [0001] The invention relates to the field of construction machinery, and more specifically, to a hydraulic oil cylinder, a hydraulic oil circuit containing the hydraulic oil cylinder, a material pumping system containing the hydraulic oil circuit, and construction machinery. Background technique [0002] In the concrete conveying equipment, the concrete piston is a vulnerable part and needs to be replaced frequently. However, since the concrete piston is completely in the conveying cylinder in the normal state (working state), when it needs to be replaced, the concrete piston must be retracted from the conveying cylinder into the water tank. Do not disassemble, replace or maintain until after neutralization. [0003] Such as figure 1 As shown, at present, the typical structure is that the concrete piston 2 is connected to the piston rod 5 through the intermediate connecting rod 20 . When the concrete piston 2 needs to be disassembled, first remove the inter...

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problem that the size of the hydraulic cylinder is too long and occupies a large space in the existing technology of the concrete return piston, the present invention provides a new type of hydraulic cylinder

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