Electric control hydraulic damping cylinder structure for intelligent knee joint

Abstract

The invention relates to an electric control hydraulic damping cylinder structure for an intelligent knee joint. The electric control hydraulic damping cylinder structure is characterized in that an upper piston is provided with a hollow piston rod and an upper piston block, the upper piston block is positioned at the lower end of the hollow piston rod, two hydraulic oil channels of upper and lower chambers are arranged on the upper piston block, and check valves with opposite flow shutting directions are respectively arranged in the two hydraulic oil channels of the upper and lower chambers; a lower piston is provided with a lower piston rod and a lower piston block, the lower piston block is positioned at the upper end of the lower piston rod, two fan-shaped holes which are used as hydraulic oil channels of upper and lower chambers are formed in the lower piston block, the upper piston block and the lower piston block are connected with each other in a cylinder block, and a butterfly valve plate is arranged between the upper piston block and the lower piston block, is connected with a stepper motor by a valve element stem in the hollow piston rod and can rotate under the control of the stepper motor, so that the flow passage areas of the hydraulic oil channels of the upper and lower chambers in the lower piston block can be changed, and the flow rates of the upper and lower chambers of a hydraulic cylinder can be changed. The electric control hydraulic damping cylinder structure has the advantage that bending and stretching damping of the prosthetic knee joint can be bidirectionally independently controlled by the single motor.

Description

technical field [0001] The invention relates to a hydraulic damping cylinder structure for a prosthetic knee joint, in particular to an electronically controlled hydraulic 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 th...

AI Technical Summary

Problems solved by technology

However, this structure uses a middle fixed block, and the pistons on both sides move, making the volume larger

Moreover, there are many connecting rods, the channels are complicated, and it is difficult to process and manufacture

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