A variable damping hydraulic cylinder

Abstract

The invention discloses a novel variable-damping hydraulic cylinder. The novel variable-damping hydraulic cylinder comprises a cylinder body, a piston rod movably connected with the cylinder body anda piston body arranged in the cylinder body, the piston body comprises a fixing piston, a first piston and a second piston, the first piston and the second piston are arranged on the two sides of thefixing piston separately, the first piston and the fixing piston are each provided with a matching hole slidably connected with the piston rod, the second piston is fixedly connected with the end of the piston rod, a first cavity is formed by the first piston and the fixing piston, a second cavity is formed by the second piston and the fixing piston, the first piston and the second piston are connected with a first elastic part and a second elastic part which are arranged at the two ends of the cylinder body respectively, the first cavity communicates with the second cavity through an oil waychannel formed in the fixing piston, and an adjusting mechanism capable of adjusting the guiding port diameter is arranged in the oil way channel. According to the novel variable-damping hydraulic cylinder, the structure is simple, piston rod extension and contraction two-way damping adjusting can be achieved, and then the speed of knee joints in the swinging period and the stability of the knee joints in the supporting period can be adjusted.

Description

technical field [0001] The invention relates to the field of medical rehabilitation equipment, in particular to a variable damping hydraulic cylinder for a rehabilitation robot. Background technique [0002] The performance of a rehabilitation robot depends largely on the comfort and safety of the wearer. The comfort of the rehabilitation robot is mainly determined by the followability of the swing speed, because if the joint drive damping cannot be changed, the rehabilitation robot cannot change with the pace of the healthy limb, resulting in an asymmetrical gait and increased energy consumption of the patient. produce great discomfort. At the same time, the stability of the rehabilitation robot during the support period is an important guarantee for walking safety. The traditional simple rehabilitation robot uses mechanical damping, and its size cannot be adjusted or automatically changed with the pace. Therefore, when the rehabilitation robot is in the swing phase of th...

AI Technical Summary

Problems solved by technology

The comfort of the rehabilitation robot is mainly determined by the followability of the swing speed, because if the joint drive damping cannot be changed, the rehabilitation robot cannot change with the pace of the healthy limb, resulting in an asymmetrical gait and increased energy consumption of the patient. cause great discomfort

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