The Study Of Nip Pressure Control Methods Of High Speed Reel Machine

As a big paper-producing country, China had been the second biggest paper-producing and paper-consuming country from the year 2001 on, and continuously narrowed the margin of United States. How the paper-producing develops has become an important topic that relates to national economy. However, the paper-producing equipments used by the most paper-producing corporations in our country are of low capability, and the productivity are of no optimistic; Some other advanced equipments are produced by foreign corporation, it will be the interference of the way to the upper stream that the core techniques are not owned by ourselves and produce of low-addition value production for a long period. Study of the paper-producing equipments of high-rolling-speed, wide-breadth and low-paper-wasting is a imminence mission for us.As the terminal equipment of paper-producer, the capability of the reel machine plays an important role of producing the high quality paper. The control of the paper-reel pressing plays a key role of the reel quality."The Study of Nip Pressure Control Methods of High Speed Reel Machine"is selected as the research subject, in order to design a new type of high-speed, wide-breadth reel-pressing control system of simple fabric.It designed the hydraulic system of paper-reel pressing control in this text, which is based on the study and investigation of the character of paper-reel pressing control. It selected the main hydraulic units and checked them in the text.It studied and improved a digital P-Q valve, analyzed it in the theory and checked by emulation, selected the stepper motor and transmission, and made the study tentatively. For the high-frequency and accurate control characteristics of reel machine, it selected DSP chip which is technical-matured, high-frequency and effective as the core of the control system, and made the hardware connection and programme conspectus.It used AMESim to emulate the P-Q valve and the hydraulic system. The result suggested that the system worked promptly and accurately, the outputs were precise and steady, and they can meet the design perfectly.