Design Of Physical Modification Equipment Of Ramie Cotton Fiber By Liquid Ammonia

Ramie cotton fiber modification technology is a method which can improve the spinning performance of these fibers through the modification medium in the environment with certain temperature and pressure. Now most of modification equipment is non-sealed sequential processing equipment. The disadvantages of this kind of equipment are that one-time investment is expensive, that the improvement of fabric performance is limited, and that it is difficult to meet the market demand of variety and high quality for ramie cotton textile. Sealed intermittent liquid ammonia modification technology aiming at resources from upstream of textile industry such as natural ramie cotton fiber and yarn, can better improve the performance of fiber and its spinning performance to satisfy market requirements.Based on yarn manufacturing process, this paper takes sealed intermittent modification tank as the study object and designs a kind of sealed intermittent liquid ammonia modification device for ramie cotton fiber. The rotating frame of tank inside of intermittent liquid ammonia modification equipment is driven by outside servo motor. In order to sealing the rotating shaft dynamically under high pressure and to avoid the linkage of liquid ammonia, a magnetic fluid seal device is introduced and adjusted to liquid ammonia modification equipment to meet the requirement of seal under high pressure.The thesis has mainly done the following work:(1) the overall design of modification device;According to the general requirements and functional complication of ramie cotton fiber liquid ammonia modification, the process of ramie cotton fiber liquid ammonia modification has been replanned, sealed intermittent liquid ammonia modification tank has been overall redesigned based on the process.(2) the design of liquid ammonia modification tank;According to the overall design, with reference to the pressure vessel design criteria, structural design of the processing tank has been done; according to the requirement of materials transportation, materials box and modified bracket has been designed by using3D modeling software to create3D CAD model of the liquid ammonia modification device.(3) the design of multistage magnetic fluid seal technique around tank rotating shaft; According to the special sealing requirement around the rotating shaft of liquid ammonia modification of ramie cotton fiber during the working processing, a multi-stage magnetic fluid seal device has been designed to use here. By using ANSYS software and finite element method, magnetic field has been simulated and the magnetic induction at the sealing gap has been calculated, which theoretically verifies the design of multi-stage magnetic fluid seals to meet the appropriate seal pressure differences.(4) the temperature field simulation of multistage magnetic fluid seal around tank rotating shaft.By using ANSYS Workbench software, numerical analysis of the designed magnetic fluid seal devices has been done in order to get the temperature distribution of the magnetic fluid seal device. Temperature field simulation provides a theoretical basis for the use of high-speed step-by-step water-cooled design.With the automation of production requirements, the scientific and technological development and market demand, this paper, about the design of the mechanical devices and systems for high-efficiency, high-quality finishing of the modification on the completion of ramie cotton fiber and yam in liquid ammonia is of great significance.