Contact problem at mill semi finished items with the account of the thermal emission and forces in knife grinding machines

International Jubilee Scientific and Practical Conference "Innovative directions of development of the forestry complex"

生态环境科学

Vikharev, S.^1

Faculty of Technical Mechanics and the Equipment of Pulp-and-paper Manufactures, Ural State Forest Engineering University, Siberian tract 36, Ekaterinburg

620100, Russia^1

关键词: Centrifugal Forces;    Contact temperature;    Experimental research;    Force of friction;    Hydrodynamic impacts;    Process equipments;    Pulp and paper industry;    Thermo-mechanical;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/226/1/012010/pdf
DOI  :  10.1088/1755-1315/226/1/012010

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Knife grinding machines - the basic process equipment for mill fibrous materials in a pulp and paper industry. In article the forces arising knife gap a backlash at mill chip and fibrous weight of high concentration are investigated. It is centrifugal force, force of friction of a semi finished item about grinding disks, force of pressure steam and axial force. Steam can promote promotion or, on the contrary, braking of movement of a semi finished item in knife gap a backlash. The contact task is considered and solved in view of a thermal emission in a zone mill. Formulas for definition of contact temperatures in a zone mill are received. Settlement values of temperature prove to be true experimental researches. The maximal temperature in a zone of contact is observed in a zone 0.50-0.70 radiuses sets. This zone coincides with a zone of the maximal pressure in which there is a zone of zero speed steam. Current steam is investigated in the field of contact of a rotor and stator. Conditions of movement pair from a zone of zero speed steam to periphery and to the center of grinding disks are revealed. Movement pair to the center of grinding disks is undesirable. Thus productivity of a mill decreases and hydrodynamic impacts grow by elements of a design of a mill. Such mode of movement steam depends on technological and regime factors mill and quite often arises at mill chips in manufactures of a thermomechanical and chemical-thermomechanical wood pulp. The steam is recommended to delete directly from a zone of zero speed.