Research On The Pneumatic Control Strategy Of Cervical Support Cylinders

With the dominant trend of smartphones and tablets, the prevalence of cervical vertebrae syndrome is raising for years, and even there has been a younger trend. Cervical traction is the optimized therapy for early cervical vertebrae syndrome.In this paper, the support cylinders of cervical vertebrae, a critical part of cervical traction bed, is the main object to be studied, especially its control strategy of pneumatic control system. Inspired by multi-point forming tech, the cervical vertebrae support cylinders consists of six identical single rod cylinders with independent movement, which are permutated to fit human’s cervical vertebrae curve. The goal is to realize the basic rehabilitation treatment function of damaged cervical vertebra by controlling the position of cervical vertebra support cylinders on the premise of using pneumatic control technology.Firstly, based on the peculiarity of the cervical vertebrae, the horizontal traction bed and cervical support cylinder structure have been designed by three-dimensional design software. Next, the functions and operating modes and the working principle of the pneumatic system have been explained. Then, the crawl phenomenon and mechanism of cylinder movement at low speed have been analyzed. At last, the output force and speed performance of cylinder have been simply analyzed.Secondly, pneumatic technology is used in automatic production more and more widely, but it has always been difficult for high precision positioning. Based on the merits and demerits of various control strategies, fuzzy-PID has been selected as the control strategy of pneumatic system of cervical support cylinders. Also, a joint control of pressure and displacement have been added to ensure its security and reliability as a medical equipment application.Finally, the control strategy of pneumatic system of cervical vertebrae support cylinders has been simulated by using MATLAB/Simulink. The outcome demonstrates that the system dynamic peculiarity, response speed and positioning accuracy is much better when using fuzzy-PID strategy. The outcome of the curve comparison of the output signal and the input signal simulation elaborates that the adopted strategy is capable of living up the expectations.This paper offers a related theoretical foundation for the pneumatic position control technology being applied in the field of medical apparatus and instruments. It also has both theoretical and practical value on boosting the prosperity of medical apparatus and instruments industry.