A key-shaped groove flow regulating damping cylinder for intelligent knee joint

Abstract

The invention provides a spline groove type flow rate adjusting damping cylinder for an intelligent knee joint. The spline groove type flow rate adjusting damping cylinder comprises a cylinder part, apiston assembly, a spring assembly and a flow rate adjusting assembly, wherein the cylinder part is provided with a cylinder body, a steel coat and a cylinder cover; the cylinder body is provided with two parallel hydraulic oil passages; the steel coat is fixedly arranged in the cylinder body by a sealing ring, and the cylinder cover is fixedly arranged at the upper end of the cylinder body through threads; the piston assembly is arranged in the cylinder body, and is provided with a piston rod and a piston, and the piston is sheathed on the piston rod through threads; the spring assembly is provided with a spring push block, an extending-assisting spring and a spring casing, the spring push block is fixedly connected with the lower end of the piston rod, the extending-assisting spring isarranged under the spring push block, and the spring casing is connected with the bottom end of the cylinder body and is used for accommodating the extending-assisting spring; the flow rate adjustingassembly is provided with an adjusting seat, an axial adjusting valve body, a stopper and a stepping motor, the adjusting seat is fixedly connected with the cylinder body, the upper part of the adjusting seat is provided with a cylindrical groove opening, the axial adjusting valve body is arranged on the adjusting seat through the cylindrical groove opening, the stopper is arranged on the adjusting seat and is used for fixing the axial adjusting valve body, the stepping motor is fixedly arranged at the bottom part of the adjusting seat, and the stepping motor is connected with the axial adjusting valve body.

Description

technical field [0001] The invention relates to a damping cylinder structure, in particular to a key-shaped groove type flow regulating damping cylinder for an intelligent knee joint. 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, there are mainly three ways to adjust damping in smart knee joints: magneto-rheological, 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 magnetorheological fluid, which...

AI Technical Summary

Problems solved by technology

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 magnetorheological fluid, which is not easy to control and is not easy Increase production capacity

Both hydraulic pressure and air pressure use a microprocessor to drive the motor to adjust the valve opening of the damping cylinder, so as to achieve the purpose of adjusting the damping, but the stability of the pneumatic knee joint support performance is not reliable, which is likely to cause safety accidents

[0003] At present, there are few domestic structural designs for intelligent knee joint hydraulic damping cylinders. Related technical documents include publication number CN105769395A and publication number CN106726028A, both of which propose electronically controlled hydraulic damping cylinder structures for intelligent knee joint prostheses, but there are motors 1. The shafts of the adjustment valve body and the piston are in a straight line and are connected or in contact with each other, so that the motor receives a large axial load during the operation of the knee joint. During the adjustment process, it is easy to lose step and fail to reach the designated position, which seriously affects the knee joint. Performance issues with damping adjustments

[0004] Although the electronically controlled hydraulic damping cylinder structure proposed by the publication number CN106539633A avoids the problem of excessive axial load on the motor, the hydraulic flow path in the piston block is complicated and difficult to process

[0005] Publication number CN102065799A discloses a semi-driven prosthetic knee joint device, which realizes driving and non-driving modes through hydraulic pumps and damping adjustment valves, but the hydraulic valve circuit is complex and complex, and the hydraulic pump and electric motor make the structure complex and heavy

[0006] Publication No. CN201370655Y and Publication No. CN107035808A, although these two patents realize the separate adjustment of buckling and extension, but need two motors to control the corresponding valves, making the volume and weight larger and power consumption increased

Images