A needle valve type dual oil circuit coupling adjustment damping cylinder for intelligent knee joint prosthesis

Abstract

The invention discloses a needle valve type double oil circuit coupling adjustment damping cylinder for intelligent knee joint prosthesis, relates to the technical field of damping cylinders, and comprises a cylinder part, a flow regulating module and a motor fixing module. The needle valve body is controlled and driven by the linear motor of the motor fixing module. The present invention controls the up and down movement of two needle valve bodies simultaneously by one linear motor, so that only one motor is used to realize the two-way independent control of the hydraulic damping of the knee joint, and the damping adjustment is continuous, so that the whole mechanism is small in size, light in weight, and reduces In order to reduce power consumption, the whole mechanism is compact and easy to process.

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 adjustment damping cylinder for intelligent knee joint prostheses. Background technique [0002] Smart knee joint refers to controlling the knee joint damper through a microcomputer to control the speed of the swing phase and the stability of the support phase at the same time, so that patients with lower limbs can walk closer to the gait of a healthy person when wearing a prosthesis, with higher followability and symmetry. . At present, three methods of adjusting damping in smart knee joints mainly include magnetorheological, pneumatic and hydraulic. The magnetorheological smart knee joint achieves the effect of adjusting the damping by changing the current to change the magnetic field strength. However, the change of the viscosity of the magnetorheological fluid is closely related to the magnetic field, and the requiremen...

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

Images