scholarly journals Investigation of sectional operating elements for conveying agricultural materials

2020 ◽  
Vol 66 (No. 1) ◽  
pp. 18-26
Author(s):  
Roman Hevko ◽  
Roman Rohatynskyi ◽  
Myroslav Hevko ◽  
Oleh Lyashuk ◽  
Oleksandra Trokhaniak
Keyword(s):  
Experimental Investigation ◽  
Experimental Studies ◽  
Design Parameters ◽  
Radius Of Curvature ◽  
Material Damage ◽  
Technological Parameters ◽  
Screw Conveyer ◽  
Operating Element ◽  
Processing Line ◽  
Agricultural Materials

The paper covers the results of the theoretical and experimental investigation of the developed sectional operating element of a flexible screw conveyer designed for transporting bulk agricultural materials. In order to determine the correlation between the design parameters of the hinged screw sections and the minimum permissible radius of curvature of a processing line, the analytical dependences have been deduced. The results of the experimental studies aimed at determining the efficiency of a screw conveyer and the level of the grain material damage depending on the change in design, kinematic and technological parameters of an operating element are presented.

scholarly journals RESEARCH OF THE OF BULK MATERIAL MOVEMENT PROCESS IN THE INACTIVE ZONE BETWEEN SCREW SECTIONS

2020 ◽  
Vol 60 (1) ◽  
pp. 261-268
Author(s):  
O.M. Trokhaniak ◽  
R.B. Hevko ◽  
O.L. Lyashuk ◽  
T.A. Dovbush ◽  
B.V. Pohrishchuk ◽  
...  
Keyword(s):  
Optimal Design ◽  
Bulk Material ◽  
Experimental Studies ◽  
Screw Conveyor ◽  
Technological Parameters ◽  
Movement Process ◽  
Curved Paths ◽  
Agricultural Materials

The article presents the results of theoretical and experimental studies of the process of moving bulk material in the inactive zone between hinged screw sections of a flexible screw conveyor. The influence of the gap between the edges of adjacent screw sections and the magnitude of their circular displacement on the process of continuous transportation of bulk material is presented. The results of theoretical and experimental studies are compared. This will allow choosing the optimal design, kinematic and technological parameters of the developed sectional screw working body when transporting bulk agricultural materials along curved paths, both in horizontal and inclined directions, as well as along curved paths.

EXPANSION OF TECHNOLOGICAL CHARACTERISTICS OF THE HARROWING UNIT

2021 ◽  
Vol 1 (142) ◽  
pp. 83-88
Author(s):  
Aleksandr Slepenkov ◽  
◽  
Sergey Kulinchenko ◽  
Sergey Shchitov ◽  
Evgeniy Kuznetsov
Keyword(s):  
Experimental Studies ◽  
Research Purpose ◽  
Design Parameters ◽  
Necessary Condition ◽  
Technological Parameters ◽  
Depth Of Processing ◽  
Technological Characteristics ◽  
Low Load ◽  
Priority Direction

Improving the quality of pre-sowing tillage is a priority direction. Harrowing with the use of heavy disc harrows is one of the operations of pre-sowing tillage. An important task when using heavy disc harrows is to ensure sufficient load on the working body. (Research purpose) The research purpose is in increasing the efficiency of the harrowing process by adjusting the coupling weight in the tractor-harrow link using special devices. (Materials and methods) It is important to match the necessary condition of balance between the load on the working body and the traction qualities of the tractor with a low load-bearing capacity of the soil. The article describes a regulator of the coupling weight of the harrowing unit, for which was applied a patent. The article presents the general types of connection of the device with the disk harrow frame. (Results and discussion) The proposed device allows you to redistribute the weight of the unit, thereby automatically changing the load on the working body. Authors performed experimental studies on the influence of the main design parameters of the devices on the operation of the machine and tractor unit. (Conclusions) The proposed device allows, by expanding the design and technological parameters, to regulate the depth of processing, traction characteristics and speed of the harrowing unit.

Talonavicular Joint Surface Anatomy and Prototype Resurfacing Prostheses

Foot & Ankle ◽  
1981 ◽  
Vol 2 (1) ◽  
pp. 5-14 ◽  
Author(s):  
A. U. Daniels ◽  
K. M. Samuelson ◽  
K. A. Rusin
Keyword(s):  
Range Of Motion ◽  
Surface Area ◽  
Experimental Studies ◽  
Joint Surface ◽  
Design Parameters ◽  
Radius Of Curvature ◽  
Arc Length ◽  
Human Foot ◽  
Surface Anatomy ◽  
Prosthetic Joint

The curvature and extent of a joint surface largely determine the type and range of motion possible. The talonavicular surface anatomy of 10 human foot specimens has been determined quantitatively, and the data have been compared with the design parameters for a prototype prosthetic joint. It was found that, in general, the natural talus as compared with the navicular was slightly larger in surface area and in mean arc length, but slightly smaller in mean radius of curvature. The arc length of the joint was found to be generally slightly longer along an axis positioned from slightly medial of dorsal to slightly lateral of ventral. In contrast, no general orientation of the radius of curvature was observed. Also, it was found that the congruency between the talus and navicular surfaces, as indicated by corresponding radii of curvature, varied widely. In comparison to the human specimens, a previously designed prototype talonavicular prosthesis proved somewhat smaller in radius, arc length, and surface area. Experimental studies related to other prosthesis design parameters, besides type and range of motion, are in progress.

scholarly journals Air column of pressure hydrocyclone with pneumatic regulator

2021 ◽  
pp. 4-10
Author(s):  
Yuri Kopanytsia
Keyword(s):  
Solid Phase ◽  
Experimental Studies ◽  
Optimization Criterion ◽  
Design Parameters ◽  
Laboratory Model ◽  
Maximum Effect ◽  
Technological Parameters ◽  
Linear Character ◽  
Column Pressure ◽  
Air Column

A reliable non-contact pneumatic pressure regulator of a pressure hydrocyclone is offered. The regulator is installed in the area of ​​the sand nozzle. The pneumatic regulator of the standard pressure cylindrical-conical hydrocyclone provides non-contact thickening of the product in the area of ​​the sand nozzle. In the process of controlling the operation of the hydrocyclone along its axis, an air column is formed. Features of the regulator affect the formation of the air column of the hydrocyclone. The pressure in the air column is manometric. The task is to investigate the effect of pulp pressure at the inlet of the hydrocyclone, pulp thickening and air column pressure. Experimental studies were performed in the laboratory on a model of a standard industrial cylindrical-conical hydrocyclone HC360. The connection between the technological parameters of the hydrocyclone operation and the pressure in the air column has been studied. to establish possibilities of control of work of a hydrocyclone on pressure in an air column. The planning of the experiment in the laboratory on a hydrocyclone model was performed in the program Statgraphics Centurion XV. Experimental studies were performed for the optimal parameters of the angle and slit of the pneumatic regulator. The optimization criterion is chosen – the maximum effect of pulp thickening while minimizing local energy losses in the nozzle. In laboratory conditions, the change in pulp pressure and density at the inlet of the hydrocyclone over the entire operating range is simulated. The laboratory model of the hydrocyclone was made on a scale of M1:10. Flotation waste was used as pulp. Modeling of hydrocyclone operation as a part of water-sludge system at the concentrator is carried out. The density of the solid phase is 1500 kg/m3. The solids content at the inlet is 10 g/l. Samples were taken by volumetric measurement with a measuring vessel. A statistically significant relationship between the pressure in the air column of the hydrocyclone and the effect of pulp thickening in a standard cylindrical-conical hydrocyclone was established. The presence of the linear character of the dependence of the coefficient of thickening and pressure in the air column of the hydrocyclone with the pneumatic regulator is checked. The absence of a statistically significant effect of hydrocyclone supply pressure on the dependence of other selected factors was established. Experimental studies were carried out at the optimal design parameters of the pneumatic regulator according to the criteria of minimizing the loss of energy of air current in the nozzle and minimizing the volumetric flow of air.

EXPANSION OF TECHNOLOGICAL CHARACTERISTICS OF THE HARROWING UNIT

2021 ◽  
Vol 1 (142) ◽  
pp. 83-88
Author(s):  
Aleksandr E. Slepenkov ◽  
◽  
Sergey N. Kulinchenko ◽  
Sergey V. Shchitov ◽  
Evgeniy E. Kuznetsov
Keyword(s):  
Experimental Studies ◽  
Research Purpose ◽  
Design Parameters ◽  
Necessary Condition ◽  
Technological Parameters ◽  
Depth Of Processing ◽  
Technological Characteristics ◽  
Low Load ◽  
Priority Direction

Improving the quality of pre-sowing tillage is a priority direction. Harrowing with the use of heavy disc harrows is one of the operations of pre- sowing tillage. An important task when using heavy disc harrows is to ensure sufficient load on the working body. (Research purpose) The research purpose is in increasing the efficiency of the harrowing process by adjusting the coupling weight in the tractor–harrow link using special devices. (Materials and methods) It is important to match the necessary condition of balance between the load on the working body and the traction qualities of the tractor with a low load- bearing capacity of the soil. The article describes a regulator of the coupling weight of the harrowing unit, for which was applied a patent. The article presents the general types of connection of the device with the disk harrow frame. (Results and discussion) The proposed device allows you to redistribute the weight of the unit, thereby automatically changing the load on the working body. Authors performed experimental studies on the influence of the main design parameters of the devices on the operation of the machine and tractor unit. (Conclusions) The proposed device allows, by expanding the design and technological parameters, to regulate the depth of processing, traction characteristics and speed of the harrowing unit.

scholarly journals THE DESIGN PARAMETERS OF A BOOT NODE OF THE DISINTEGRATOR AT INSTALLATION OF PIPE RECYCLE MATERIAL

2019 ◽  
Vol 4 (5) ◽  
pp. 165-169
Author(s):  
И. Семикопенко ◽  
Igor' Semikopenko ◽  
В. Воронов ◽  
Vitaliy Voronov ◽  
Д. Смирнов ◽  
...  
Keyword(s):  
Mass Flow Rate ◽  
Mass Flow ◽  
Flow Rate ◽  
Granulometric Composition ◽  
Branch Pipe ◽  
Discharge Zone ◽  
Design Parameters ◽  
Radius Of Curvature ◽  
Technological Parameters ◽  
Analytical Expression

Currently, disintegrators are equipment used for grinding, mixing and activation of a number of materials. The possibility of obtaining a grinding product with a given granulometric composition is one of the advantages of disintegrators. An experimental unit with a recycling pipe is created to obtain a narrow granulometric composition of the grinding product. It provides unloading of the finished product and returning the grits for additional grinding to the chamber. The branch pipe of the recycle is a rubber-fabric pipe of circular cross-section with a radius of curvature, which ensures the movement of a two-phase medium from the discharge zone to the loading part of the disintegrator. When performing theoretical studies of the grinding process, it is necessary to coordinate the throughput of the loading unit and the node of the disintegrator recycle. In addition, the mass flow rate of the material through the feeder and the mass flow rate of the material (throughput) passing through the rows of percussion elements must be the same for the balanced operation of the disintegrator and the feeder. The mass flow capacity of the coarse material moving in the recycling pipe is determined based on the assumption of the linear nature of the change in bulk density when the material moves inside the recycling pipe. In result of theoretical researches, the analytical expression is received allowing to define a radius of a pipe of the modernized feeder proceeding from constructive and technological parameters of a disintegrator with a branch pipe of a recycle. A calculation scheme for determining the radius of the pipe of an improved disintegrator is presented. The analysis of obtained analytical expression allows to conclude that the radius of the pipe of the modernized unit is associated with the design and technological parameters of the disintegrator

Justification and determination the main parameters of spiral plate-type of work part

10.12737/1348 ◽  
2013 ◽  
Vol 8 (3) ◽  
pp. 57-62
Author(s):  
Булгариев ◽  
Gumar Bulgariev ◽  
Юнусов ◽  
Rafail Yunusov
Keyword(s):  
Experimental Studies ◽  
Cutting Edge ◽  
Design Parameters ◽  
Depth Of Cut ◽  
Helical Line ◽  
Working Surface ◽  
Operating Element ◽  
Basic Parameters ◽  
Spiral Plate ◽  
Plate Type

Justification and analytical derivation of the equations to determine the basic parameters (including forms) of rotary (circular, screw, a helical-type and etc.) working parts of tillers were the subject of investigations by several authors. Also from literature sources, we can say that the working parts of passive rotary actuator (jet - the drive from the soil) for the crumbling of the soil and associated operations will require further theoretical and experimental studies. Therefore, we investigated spiral plate-type working part with corrugated (wavy) work surface and a cutting edge with teeth, accomplished at the site of the logarithmic spiral. Thus, the wavy form of the working surface has an influence on the cutting edge. In consequence of that, the teeth of the cutting edge radially disposed on a path, extending along a helical line and rejected in two directions (right and left turn). Based on the foregoing, we justified and prepared relations to define the basic parameters of the working surface of the teeth and the cutting edge of the working part spiral plate-type elements: the diameter (D), the number of teeth (Z3), the depth of cut (C'), the distance between adjacent teeth - tooth pitch (S3 ), length of the front cutting edge of the tooth (ℓ 3), the length of back edge of the tooth (ℓ t), lead of a screw (tmax), the width of the operating element (H), width of a tooth at its apex (B3) and the distance from the apex of the tooth to its leading edge (L3 ). The analytical dependence can justify the choice of the main design parameters of the operating element and design the toothed spiral plate-type working part, which is reduced to the calculation of the basic dimensions and meaningful implementation.

A possibility of using nickel concentrate, obtained as a result of hydrometallurgical enrichment of manganese-containing raw materials, at steel alloying

2020 ◽  
Vol 76 (7) ◽  
pp. 709-715
Author(s):  
O. Yu. Kichigina
Keyword(s):  
Raw Materials ◽  
Experimental Studies ◽  
Selective Extraction ◽  
Technological Parameters ◽  
Nickel Iron ◽  
Nickel Recovery ◽  
Nickel Concentrate ◽  
Steel Alloying ◽  
High Degree ◽  
Comprehensive Processing

At production of stainless steel expensive alloying elements, containing nickel, are used. To decrease the steel cost, substitution of nickel during steel alloying process by its oxides is an actual task. Results of analysis of thermodynamic and experimental studies of nickel reducing from its oxide presented, as well as methods of nickel oxide obtaining at manganese bearing complex raw materials enrichment and practice of its application during steel alloying. Technology of comprehensive processing of complex manganese-containing raw materials considered, including leaching and selective extraction out of the solution valuable components: manganese, nickel, iron, cobalt and copper. Based on theoretical and experiment studies, a possibility of substitution of metal nickel by concentrates, obtained as a result of hydrometallurgical enrichment, was confirmed. Optimal technological parameters, ensuring high degree of nickel recovery out of the initial raw materials were determined. It was established, that for direct steel alloying it is reasonable to add into the charge pellets, consisting of nickel concentrate and coke fines, that enables to reach the through nickel recovery at a level of 90%. The proposed method of alloying steel by nickel gives a possibility to decrease considerably steel cost at the expense of application of nickel concentrate, obtained out of tails of hydrometallurgical enrichment of manganese-bearing raw materials, which is much cheaper comparing with the metal nickel.

EXPERIMENTAL STUDIES OF REINFORCED CONCRETE STRUCTURES WITH CROSS-SHAPED SPATIAL CRACK UNDER TORSION WITH BENDING

2020 ◽  
Vol 92 (6) ◽  
pp. 13-25
Author(s):  
Vl.I. KOLCHUNOV ◽  
◽  
A.I. DEMYANOV ◽  
M.M. MIHAILOV ◽  
◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Experimental Determination ◽  
Calculation Method ◽  
Experimental Studies ◽  
Concrete Structures ◽  
Design Parameters ◽  
Reinforced Concrete Structures ◽  
Experimental Scheme

The article offers a method and program for experimental studies of reinforced concrete structures with cross-shaped spatial crack under torsion with bending, the main purpose of which is to check the design assumptions and experimental determination of the design parameters of the proposed calculation method. The conducted experimental studies provide an opportunity to test the proposed calculation apparatus and clarify the regularities for determining deflections, angles of rotation of extreme sections, and stresses in the compressed zone of concrete. For analysis, the article presents a typical experimental scheme for the formation and development of cracks in the form of a sweep, as well as characteristic graphs of the dependence of the angles of rotation of end sections.

Use of Digital Twins for Mathematical Modeling of Ultrasonic Cutting of Titanium Blanks

2021 ◽  
Vol 1037 ◽  
pp. 369-376
Author(s):  
Maxim Ilyushkin ◽  
Kirill Savelev ◽  
Oleg Krupennikov ◽  
Evgeniy S. Kiselev
Keyword(s):  
Mathematical Modeling ◽  
Thermal Power ◽  
Experimental Studies ◽  
Ultrasonic Field ◽  
Design Parameters ◽  
Digital Twins ◽  
Machine Parts ◽  
Cutting Processes ◽  
Stock Removal ◽  
Processing Zone

The paper presents the results of numerical experimental studies of cutting titanium blanks using mathematical modeling programs, which make it possible to completely repeat technological processes in a computer (digital twin). The LS-DYNA product was used as a program to simulate the process of stock removal from titanium blank. It has been established that the use of this method adequately describes the cutting processes, including with the introduction of the energy of an ultrasonic field into the processing zone, can significantly reduce the duration of experimental research and evaluate the influence of the elements of the cutting mode and design parameters of the tool on the thermal power aspects of the formation of new surfaces of machine parts.

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