Theoretical study of the flax pulling process by conical-disc flax pulling mechanism

Abstract

Flax is mainly grown to produce a long flax fibre. Therefore, during harvesting, it is important to ensure the parallelism of flax stems in the band, as it is necessary for subsequent technological operations. The most common are belt flax pulling mechanisms. A large number of scientific studies of leading scientists in the field of flax are devoted to the theoretical justification of the design and parameters of these flax-pulling mechanisms. These flax pulling mechanisms provide high quality flax and parallelism of the stems in the flax band. But these flax pulling mechanisms are bulky, have a complicated structure and drive. During the processing of flax into a short flax fibre according to new technologies, there is no need for the stems in the tape to be parallel, even damage to the stems and their rupture is allowed. Thus, for flax harvesting, which is processed into a short flax fibre, it is possible to use flax pulling mechanisms of a simpler design, which should provide only the pulling of all flax plants from the soil. In most farms, grain harvesters are used to harvest flax, which is intended for processing on short fibers. The cutting mechanism of grain harvesting combines often fails, since flax contains fibers. In addition, in the stubble after cutting the flax, the fiber that is lost is left. Therefore, it is necessary to pull flax from the soil, and cutting flax is not desirable. Therefore, research towards the development of simple design of flax pulling mechanism is relevant. Accordingly, the aim of the study is to justify design parameters of conical-disc flax pulling mechanism. The theoretical study of the flax pulling process with a new conical-disc flax pulling mechanism having a simple design allowed us to obtain the conditions for substantiating its rational parameters, depending on the state and parameters of flax. Conditions for determining the angular velocity and the height of the installation of disks and equations describing the trajectories of motion of parts of the flax stem during pulling process are obtained.
Keywords: fiber flax, linseed, flax pulling process, flax pulling mechanisms, flax harvesting, flax harvesting machines.