Single-circuit bidirectional flow pre-adjustment damping cylinder for intelligent knee prosthesis

Abstract

The invention discloses a damping cylinder structure, in particular to a single-circuit bidirectional flow pre-adjustment damping cylinder for intelligent knee joint prosthesis, comprising: a cylinder part; One side of the cylinder; the cylinder includes: a cylinder; a titanium alloy sleeve, which is coaxially nested inside the cylinder; a cylinder cover, which is connected to the cylinder by threads upper end; piston, the piston moves up and down in the cylinder body and divides the inner chamber of the cylinder body into an upper chamber and a lower chamber; an extension-assisting spring, the extension-assisting spring is built in the cylinder body The lower cavity; the upper cavity oil hole and the lower cavity oil hole; the oil injection port, the oil injection port is located on the cylinder wall of the cylinder block; the oil injection port plug, the oil injection port plug and the oil injection port are threaded Connection; the oil passage opened from the oil filling port meets the oil hole of the upper chamber and the oil hole of the lower chamber to form a hydraulic oil circuit.

Description

technical field [0001] The invention relates to a damping cylinder structure, in particular to a single-circuit bidirectional flow pre-adjusting damping cylinder for an intelligent knee joint prosthesis. Background technique [0002] Damping prostheses are the mainstream of current research on intelligent knee prostheses. Damping prosthesis means that the microprocessor automatically adjusts the damping torque generated by the damper at the knee joint prosthesis according to changes in gait speed / gait phase / road conditions, so that the gait of a lower limb patient is closer to that of a healthy person when wearing a prosthesis, and has a higher followability and symmetry. [0003] At present, there are mainly four ways to adjust the damping in the smart knee joint: air pressure, hydraulic pressure, magneto-rheological and electro-rheological. Air pressure damping is suitable for speed following in the swing phase, but it is difficult to provide sufficient damping in the su...

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Problems solved by technology

[0008] Application No. 200980122636.0 proposes a semi-actuated prosthetic knee joint device, which realizes driving and non-driving modes through hydraulic pumps and damping adjustment valves, but the hydraulic valve circuit is very complicated, and the hydraulic pump and electric motor make the structure complex and heavy

[0009] Application No. 201910248943.9 proposes a key-groove flow regulating damping cylinder structure, which realizes simultaneous control of buckling and extension damping by a motor, but the hydraulic oil circuit is complicated. The sealing between the seats is difficult to be guaranteed, and the hydraulic oil passage is directly connected to the notch on the valve vertically, so that the hydraulic oil flowing out of the oil passage will have a convective impact on the valve notch, causing a large tangential force on the valve. The torque required by the motor to control the rotation of the valve increases, which increases the power consumption of the motor

[0010] To sum up, the existing hydraulic damping cylinders with bidirectional damping and continuous adjustment of buckling and extension through a single motor have few structural designs, and the only few still have complex hydraulic circuits, which lead to difficult processing and oil leakage, and shafts affected by the motor The common problem that the performance of the motor is affected by the excessive load or tangential force

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