scholarly journals THE GRINDING MECHANISM ON A KNIFE CENTRIFUGAL GRINDING MACHINE

2020 ◽  
pp. 485-492
Author(s):  
Ivan Andreyevich Voronin ◽  
Yuriy Davidovich Alashkevich ◽  
Viktor Anatol'yevich Kozhukhov
Keyword(s):  
Mechanical Characteristics ◽  
Sliding Friction ◽  
Rolling Friction ◽  
Friction Forces ◽  
Inertial Body ◽  
Grinding Mechanism ◽  
Working Bodies ◽  
Grinding Machine ◽  
Fibrous Suspension ◽  
Physical And Mechanical Characteristics

The article presents a methodology for calculating the force effect on a fibrous suspension of working bodies in a centrifugal grinding apparatus. The aim of the research is to calculate the force per tooth of an inertial body at different speeds of rotation of the rotor, to determine the effect of the circumferential speed of movement of inertial bodies on the grinding process of fibrous semi-finished products. The article discusses the mechanism of grinding on a centrifugal knife grinding apparatus, determines the tangential shear forces at the contact of the grinding satellite knives with the grinding bowl knives, determines the effect on the fiber of rolling friction forces and sliding friction forces when the grinding satellite knives come into contact with the grinding bowl knives, as well as the effect of specific pressure at the point of contact of the satellite knives with the grinding bowl knives under the influence of inertial forces. Based on the research results, it is scientifically substantiated that the forces arising at the minimum of the considered values of the rotation speed of inertial bodies are sufficient to break the fiber when using this installation for grinding fibrous semi-finished products. An increase in the speed of rotation of the satellites causes a positive change in the physical and mechanical characteristics of the finished castings.

scholarly journals Analytical substantiation of constructive parameters of rotating field board of plow’s body

2019 ◽  
Vol 126 ◽  
pp. 00038
Author(s):  
Vladimir Konovalov ◽  
Sergey Konovalov ◽  
Victoria Igumnova
Keyword(s):  
Sliding Friction ◽  
Rolling Friction ◽  
High Energy ◽  
Cultivated Plants ◽  
Friction Forces ◽  
Technical Parameters ◽  
Cutting Resistance ◽  
Different Depths ◽  
Analytical Relations ◽  
Rotating Field

The article shows importance of use of dump plowing for formation and maintenance of soil structure and pest control and diseases of cultivated plants. A significant drawback of plowing process is indicated, which is its high energy intensity. To reduce energy consumption, it is proposed to use rotating field boards, which allow replacing sliding friction forces with rolling friction forces. The article presents a description of design of plow’s body with rotating field board and notes that without a preliminary analytical study and justification of initial parameters, their use may not be effective. Analytical relations connecting value of radius of rotating field of board, rate of collapse of soil, allowable value of indentation of field board into soil and specific force of cutting resistance of soil that ability to use it for baseline technical parameters. To analyze obtained dependence, the article presents its graphical solution. The authors obtained an expression for determining the value of arm’s force of reference reaction from soil to balance a plow’s body, in addition, this indicator can be used to adjust a body when working on soils with different physical and mechanical parameters and at different depths.

Measurement of Rolling and Sliding Friction Coefficients of Tread Compounds

1968 ◽  
Vol 41 (4) ◽  
pp. 908-942 ◽  
Author(s):  
E. Clamroth ◽  
W. Heidemann
Keyword(s):  
Friction Surface ◽  
Sliding Friction ◽  
Water Drop ◽  
Single Point ◽  
Water Layer ◽  
Rolling Friction ◽  
Skid Resistance ◽  
Friction Coefficients ◽  
Friction Forces ◽  
Rubber Surface

Abstract We have described two methods to measure friction forces arising from sliding and rolling on a wet surface. In rolling friction we showed that energy of deformation of a braked rubber specimen could be estimated and separated from friction energy. Rolling friction shows a characteristic slip dependence for various compounds. The rise at low slip values can be quantitatively explained. Especially with polybutadiene vulcanizates, at higher slips the friction coefficient decreases; this is attributable to thickness of the water layer between specimen and friction surface and depends on ease of wetting with water. Wetting can be altered by addition of a wetting agent like Pril, and measured by the contact angle of a water drop on the rubber surface. In wet friction, the changes in the water layer outweigh the temperature and velocity dependent shifts expected for adhesion and deformation friction components. A sort of mixed friction occurs on wet surfaces. The true contact surface, that is, surface not covered with water, has a strong effect on the magnitude of friction forces. In general only the highest asperities of the friction surface extend above the water and are in direct contact with the rubber surface. It is therefore understandable that surface asperity has a strong effect on friction coefficients. Finally we have compared friction coefficients determined with our apparatus with those obtained using the Portable Skid Resistance Tester and with results of road tests. The Portable Skid Resistance Tester provides a single point method, which has good reproducibility and whose results correlate well with those on the road at a speed of about 48 km/hr. Our apparatus has the advantage that test conditions such as velocity, temperature, and load can be widely varied. In this way, various actual driving conditions can be approximated and one may seek to determine the mechanism of friction from dependence of friction coefficients on these parameters.

scholarly journals Study of the dynamics of the coefficient of external friction of seeds crops with shell

2021 ◽  
Vol 273 ◽  
pp. 01032
Author(s):  
Igor Khozyaev ◽  
Dmitriy Savenkov ◽  
Oleg Kirischiev ◽  
Ylia Kirischieva ◽  
Tatiana Tupolskikh
Keyword(s):  
Mechanical Characteristics ◽  
Agricultural Products ◽  
External Friction ◽  
Bulk Materials ◽  
Laboratory Unit ◽  
Nonlinear Character ◽  
Grain Products ◽  
Working Bodies ◽  
Physical And Mechanical Characteristics

The article is devoted to the study of the coefficients of external friction of grain agricultural products-friction in static and dynamic modes, as the most important physical and mechanical characteristics of bulk materials. The description of carousel laboratory unit, program, methodology and results of studies on the practical determination of the coefficients of external friction for typical agricultural grain products according to the materials typical of the working bodies of the production machines. As a result of the research, it was found that in the range of linear velocities from 0 to 1.75 m/s, there is a change in the friction coefficients, which has a nonlinear character.

scholarly journals Studying physical and mechanical characteristics of corn feed

2020 ◽  
Vol 17 ◽  
pp. 00209
Author(s):  
Vyacheslav Ulyanov ◽  
Vladimir Utolin ◽  
Nikolay Luzgin ◽  
Stanislav Krygin ◽  
Marina Parshina
Keyword(s):  
Mechanical Characteristics ◽  
Physical Parameters ◽  
Laboratory Equipment ◽  
Feed Material ◽  
Exchange Processes ◽  
Intensification Of Heat Exchange ◽  
Viscous Media ◽  
Solids Content ◽  
Working Bodies ◽  
Physical And Mechanical Characteristics

The use of condensed extract in the production of corn feed contributes to the improvement of their nutritional and biological value. The rheological properties of the feed material are of great importance in the mechanical interaction with the working bodies of the machines, in the movement of viscous media along technological conveyors, as well as in the intensification of heat exchange processes. The technique, laboratory equipment and the results of studies of physical and mechanical characteristics of corn feed are presented. The viscosity properties of the corn extract are investigated depending on the temperature. It is shown that when decreasing the temperature, the viscosity of the corn extract increases due to the aggregation of its components, which characterizes the non-Newtonian flow of the extract. The coefficient of external friction of the pulp and extract mixture in the technology of preparing corn feed allows calculating the geometry of the storage tanks and energy costs of the processes. The change in the coefficients of friction of corn feed when interacting with various surfaces, depending on the content of dry substances. The specific heat capacity, thermal conductivity and thermal diffusivity of the extract and corn feed were determined and investigated. It has been revealed that the dependences of the thermo-physical parameters of the extract and corn feed on the solids content are non-linear in nature, monotonously decreasing when increasing the concentration of solids.

scholarly journals Dynamic friction coefficients of grain crops of bulk agricultural products

2020 ◽  
Vol 175 ◽  
pp. 01001
Author(s):  
Dmitriy Savenkov ◽  
Oleg Kirischiev ◽  
Valentina Serdyuk ◽  
Aleksey Shcherbakov ◽  
Dmitriy Kirillov
Keyword(s):  
Mechanical Characteristics ◽  
Agricultural Products ◽  
External Friction ◽  
Bulk Materials ◽  
Friction Coefficients ◽  
Type Device ◽  
Nonlinear Character ◽  
Grain Products ◽  
Working Bodies ◽  
Physical And Mechanical Characteristics

The article covers issues related to the study of physical and mechanical characteristics of bulk materials, namely the coefficients of external friction in static and dynamic modes. The program, methodology and results of research on the practical study of external friction coefficients of typical agricultural grain products by the surfaces made of materials typical for the working bodies of production machines, using an innovative carousel-type device, are presented. As a result of research, it was found that in the range of linear speeds from 0 to 1.75 m/s, there is a change in the friction coefficients, which has a nonlinear character.

BENCH DESIGN AND STUDY OF PHYSICAL AND MECHANICAL CHARACTERISTICS OF A TEAT CUP LINER WITH ANTIBACTERIAL FILLER

2020 ◽  
pp. 22-26
Author(s):  
YURY G. IVANOV ◽  
◽  
YELENA V. MASHOSHINA ◽  
LYUDMILA N. VERLIKOVA ◽  
DARIA G. GELETIY ◽  
...  
Keyword(s):  
Mechanical Characteristics ◽  
Physical And Mechanical Characteristics

Discharge-pulse Geotechnical Electro Discharge Technology of Bases Strengthening

2020 ◽  
Vol 787 (12) ◽  
pp. 63-65
Author(s):  
N.S. Sokolov
Keyword(s):  
Bearing Capacity ◽  
Mechanical Characteristics ◽  
Discharge Pulse ◽  
Zero Values ◽  
Traditional Technologies ◽  
Negative Friction ◽  
Geotechnical Problems ◽  
Physical And Mechanical Characteristics

The problem of increasing the bearing capacity of the base is an relevant problem in modern geotechnical construction. When significant loads are transmitted to the base, the use of traditional technologies is not always justified. Often there is an urgent need to use non-standard ways to strengthen the bases. In many cases, the geotechnical situation is aggravated by the presence of weak underlying layers with unstable physical and mechanical characteristics in engineering-geological sections. When strengthening such bases with the help of traditional piles, the latter can get negative friction, which significantly reduces their bearing capacity on the ground, sometimes reaching zero values. This may lead to additional precipitations of the objects being constructed and constructed in the zone of geotechnical influence. The use of ERT piles in most cases successfully solves many complex geotechnical problems.

Promising hybrid fabrics based on carbon and aramid fibers as a reinforcing filler for polymer composites

2019 ◽  
pp. 86-95 ◽  
Author(s):  
G. F. Zhelezina ◽  
V. G. Bova ◽  
S. I. Voinov ◽  
A. Ch. Kan
Keyword(s):  
Composite Material ◽  
Polymer Composites ◽  
Carbon Fibers ◽  
Mechanical Characteristics ◽  
High Strength ◽  
High Modulus ◽  
Hybrid Composite Material ◽  
Hybrid Fabric ◽  
Reinforcing Filler ◽  
Physical And Mechanical Characteristics

The paper considers possibilities of using a hybrid fabric made of high-modulus carbon yarn brand ZhGV and high-strength aramid yarns brand Rusar-NT for polymer composites reinforcement. The results of studies of the physical and mechanical characteristics of hybrid composite material and values of the implementation of the strength and elasticity carbon fibers and aramid module for composite material are presented. 

The Brake Device Design for Children Two-Wheel Dynamic Scooter

2011 ◽  
Vol 421 ◽  
pp. 724-727
Author(s):  
Xue Feng Yi ◽  
Li Jun He
Keyword(s):  
Sliding Friction ◽  
Rolling Friction ◽  
Safety Performance ◽  
Device Design ◽  
Emergency Braking ◽  
Design For Children ◽  
Brake Device

Children scooter safety performance is not good enough in the market, the cause of the majority of injuries to children is difficult to control the speed or emergency braking. According to the phenomenon, this paper focuses on designing dynamic scooter brake device for 8-10 child, we conceive that the brake device is given the force of the rolling friction and the sliding friction, so it can play a dual brake effect. It will enhance the security and stability of children dynamic scooter.

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