Needle valve type double-oil-way coupling adjusting damping cylinder for intelligent knee joint artificial limb

Abstract

The invention discloses a needle valve type double-oil-way coupling adjusting damping cylinder for an intelligent knee joint artificial limb, and relates to the technical field of damping cylinders. The needle valve type double-oil-way coupling adjusting damping cylinder comprises a cylinder part, a flow adjusting module and a motor fixing module, two needle type valve bodies are arranged in the flow adjusting module, and control and transmission are conducted through a linear motor of the motor fixing module. According to the damping cylinder, the linear motor is used for controlling the vertical movement of the two needle type valve bodies at the same time so that two-way independent control and continuous damping adjustment of knee joint hydraulic damping are achieved only through one motor, the whole mechanism is small in size and light in weight, power consumption is reduced, and the whole mechanism is exquisite and easy to machine.

Description

technical field [0001] The invention relates to the technical field of damping cylinders, in particular to a needle-valve type dual-oil-circuit coupling-adjusting damping cylinder for intelligent knee joint prostheses. Background technique [0002] The smart knee joint refers to controlling the damper of the knee joint through a microcomputer to control the speed of the swing phase and the stability of the support phase at the same time, so that the gait of a lower limb patient is closer to that of a healthy person when wearing a prosthesis, with higher following and symmetry . At present, the ways to adjust damping in smart knee joints mainly include magnetorheological, pneumatic and hydraulic. The magnetorheological smart knee joint adjusts the damping effect by changing the current to change the magnetic field strength, but the viscosity change of the magnetorheological fluid is closely related to the magnetic field, and it has high requirements on the material of the ma...

AI Technical Summary

Problems solved by technology

In an electro-hydraulic damping cylinder structure for intelligent knee joint prosthesis, the shafts of the motor, regulating valve body and piston are in a straight line and are connected or contacted with each other, so that the axial load on the motor during the operation of the knee joint is very small. Large, it is easy to lose the cloth and fail to reach the designated position during the adjustment process, which seriously affects the performance of knee joint damping adjustment

In a semi-actuated prosthetic knee device, the actuation and non-actuation modes are realized by hydraulic cylinders and damping adjustment valves, but the hydraulic valve circuit is particularly complicated, and the hydraulic pump and electric motor make the structure complex and heavy

In a structure that realizes hydraulic damping two-way control through a motor, the clearance fit between the designed valve body and the adjustment seat will cause the formation of an oil film in the gap for a long time, and the tension generated by the oil film will cause the valve body to rotate with excessive damping and the rotation is not smooth. The damping adjustment is inaccurate, and the extension spring is external, the lower end of the hydraulic cylinder is open, and the sealing is poor

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