Straight pushing plate type flow regulation damping cylinder for smart knee-joint

Abstract

The invention relates to a straight pushing plate type flow regulation damping cylinder for a smart knee-joint. The straight pushing plate type flow regulation damping cylinder for the smart knee-joint comprises a motor support, a hollow piston rod, a plate type valve body, a hydraulic cylinder upper cover, a hydraulic cylinder body, a hollow piston block, a spring shell and an extending assisting spring. The upper cover is fixedly connected with one end of the hydraulic cylinder body through a thread, and the spring shell is fixedly connected with the other end of the hydraulic cylinder body through a thread; the extending assisting spring is stored in the spring shell; the hollow piston block is installed in the hydraulic cylinder body; one end of the hollow piston block is connected with the extending assisting spring through the piston rod, and the other end of the hollow piston block is connected with the motor support through the hollow piston rod; the plate type valve body is installed in the hollow piston block; two flat-key-shaped holes in parallel and two circular holes in parallel up and down are formed in the plate type valve body; hydraulic oil flowing passages which are bent and extended correspondingly and in parallel are formed in the hollow piston block; and the two hydraulic oil flowing passages are arranged in the axial direction with the heights being staggered and each provided with a one-way valve. According to the straight pushing plate type flow regulation damping cylinder, bi-directional independent control over a bend-extend damp of the artificial limb knee-joint can be achieved through one linear motor.

Description

technical field [0001] The invention relates to a hydraulic damping cylinder for a prosthetic knee joint, in particular to a direct-push plate-type flow regulating damping cylinder structure for an intelligent knee joint. Background technique [0002] Smart knee joints refer to knee joint prostheses that use microprocessors to control damping, and the adjustment of knee joint damping mainly includes hydraulic pressure, air pressure, and magnetorheology. Both hydraulic and pneumatic intelligent knee joints use microprocessors to drive motors to adjust the opening of the valve inside the damping cylinder to adjust the damping; magnetorheological intelligent knee joints change the strength of the magnetic field by changing the magnitude of the current to make the magnetic current The viscosity of the variable fluid changes, thereby adjusting the damping. The hydraulic knee joint can provide a large torque in the support phase, but the flexibility is not very high in the swing ...

AI Technical Summary

Problems solved by technology

[0004] Patent No. 201370655 discloses an electronically controlled hydraulic damping cylinder for prosthetic limbs. Although this patent realizes the separate adjustment of flexion and extension, it requires two motors to control the corresponding valves, resulting in larger volume and weight and increased power consumption.

[0005] Patent application number 2016102229387 discloses a single-motor controlled prosthetic knee joint electronically controlled hydraulic damping cylinder structure, which is exquisite in structure but difficult to process

[0006] Patent Publication No. CN102065799A discloses a semi-driven prosthetic knee joint device, which realizes driving and non-driving modes through hydraulic pumps and motors, but the hydraulic valve circuit is particularly complicated, and the hydraulic pumps and motors make the structure complex and heavy

[0007] The above-mentioned inventions all use a rotary motor to control the rotation of the valve stem to achieve flow adjustment, and there is no structure that uses a linear motor to translate the valve stem for flow adjustment.

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