Hydraulic cylinder, hydraulic system and engineering machine

Abstract

The invention discloses a hydraulic cylinder with a locking device. The hydraulic cylinder comprises a piston, a piston rod and the locking device, wherein the locking device is provided with a wedge-shaped hole and a wedge-shaped component, and when the locking device is in a locking state, the wedge-shaped component is clamped between the piston rod and the wedge-shaped hole and the large end tends to move towards the small end. When the hydraulic cylinder needs to be locked, the wedge-shaped component is arranged in a clearance between the wedge-shaped hole and the piston rod to clamp the piston rod, so that the piston rod is locked in a designated position. Hydraulic oil in a rod-free cavity and the locking device of the hydraulic cylinder work commonly, so that the piston rod can be locked in the designated position, the uncontrolled contraction of the piston rod can be avoided, and the working reliability of the hydraulic cylinder can be improved. The invention also discloses a hydraulic system with the hydraulic cylinder and an engineering machine with the hydraulic system.

Description

technical field [0001] The invention relates to the field of hydraulic technology, in particular to a hydraulic oil cylinder. The present invention also relates to a hydraulic system comprising the above-mentioned hydraulic cylinder. In addition, the present invention also relates to a construction machine comprising the above-mentioned hydraulic system. Background technique [0002] With the rapid development of my country's economic construction, the application of hydraulic systems in the field of construction machinery is increasing day by day. The hydraulic system is a complete set of devices that use hydraulic oil as the working medium, use the pressure energy of the hydraulic oil and manipulate the hydraulic actuator to work through hydraulic control components. [0003] Hydraulic systems usually include power components, actuators, control components and auxiliary components. The function of the power element is to convert the mechanical energy of the prime mover ...

AI Technical Summary

Problems solved by technology

[0008] Generally, the stroke of the telescopic end of the hydraulic cylinder used in construction machinery is longer, and it is subject to a greater burden. A slight deviation in the accuracy of the piston seal fit will lead to internal leakage of the cylinder; secondly, the hydraulic cylinder controls the fit gap and manufacturing accuracy of the valve. Internal leakage will also occur; when the ambient temperature is very low, the temperature of the high-temperature hydraulic oil will drop sharply, and the volume of the hydraulic oil will decrease

The above situations will lead to a decrease in the pressure of the rodless chamber of the hydraulic cylinder, resulting in uncontrolled retraction of the telescopic end, which will not only affect the performance of the vehicle, but also cause serious safety accidents

Images