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.

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.

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.

scholarly journals RESEARCH OF THE BURROWING SHARE OF A MACHINE FOR HARVESTING VEGETABLES AND ONIONS UNDER LABORATORY CONDITIONS

2021 ◽  
pp. 238-246
Author(s):  
Alexey Dorokhov ◽  
A.V. Sibirev ◽  
Alexandr Aksenov ◽  
Nikolay Sazonov
Keyword(s):  
Soil Layer ◽  
Experimental Studies ◽  
Physical And Mechanical Properties ◽  
Optimization Criterion ◽  
Statistical Characteristics ◽  
Design Parameters ◽  
Potato Tubers ◽  
Root Crops ◽  
Working Bodies ◽  
Significant Factors

It was found that the extraction of a tuberous heap, namely potatoes, with a digging working body with a movable frame, has the most significant drawback, which is that when the depth of the burrowing share tip is changed, the angle of its inclination changes, which negatively affects the chipping of the soil layer and leads to the deterioration of the transportation of the excavated soil layer to the separating working bodies, for which it is necessary to determine and clarify the main technological and design parameters of the developed intake plough share for digging / picking up root crops and bulbs due to the fact that potato tubers and onion bulbs have different size and mass and physical and mechanical properties. A method has been developed for determining the amount of supply of a heap of onion sets from the surface of the digging share to the separating working bodies, the required soil moisture necessary for research. The methodology and results of experimental studies to determine the decrease in the content of soil impurities in the gathering heap of onions are presented, the main statistical characteristics of the experiment are reflected. Based on the results of the screening experiment, significant factors have been established that have a decisive effect on the selected optimization criterion: spring preload, determined by the spring length and the forward speed of the digging share. It was found that the minimum possible amount of soil impurities when extracting onions from the soil is 24.8%. It depends on the values of the investigated factors, values that should be set in the interval: the length of the spring L_PPR=0.02-0.04 m and the speed of the moving share v_L=1.2-1.4 m/s.

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.

Mathematical Model of Melting of Solid Sulfur Particles when Loaded into a Melting Bath

2020 ◽  
Vol 836 ◽  
pp. 1-5
Author(s):  
Pavel V. Iakovlev ◽  
Vladimir A. Lebedev
Keyword(s):  
Solid Phase ◽  
Experimental Studies ◽  
Melting Rate ◽  
Solid Particles ◽  
Technological Parameters ◽  
Liquid Sulfur ◽  
Mode Of Operation ◽  
Loading Device ◽  
Molten Liquid ◽  
Device Operation

The study solved the problem of determining the technological mode of operation of the device for loading solid lumpy and granulated sulfur into a melting bath with molten liquid sulfur. For this it is necessary to solve two main problems: to determine the method of loading solid sulfur into the melt, to calculate the main design and technological parameters to ensure the required performance of the smelting bath. As a result of experimental studies, the mode of operation of the loading device was obtained, during which the partial melting of the surface of sulfur particles in the surface layer of the melt occurred. This led to the adhesion of particles to each other, the formation of conglomerates having a size that is much larger compared with that of particles of the initial particle size distribution. As a result of this phenomenon, the melting rate and the melting bath were significantly reduced, filled with a solid phase. As a result of the study, a model was developed and the problem of calculating the limiting modes of the loading device operation was solved for preventing solid particles from sticking together.

scholarly journals ANALYSIS OF THE EXISTING ROUTE NETWORK OF THE CITY OF MARHANETS

2021 ◽  
pp. 60
Author(s):  
O. OHAR ◽  
I. BERESTOV ◽  
S. BANTYUKOV ◽  
N. KRUHLOVA
Keyword(s):  
Rational Design ◽  
Assessment Method ◽  
Optimization Criterion ◽  
Practical Significance ◽  
Design Parameters ◽  
Technological Parameters ◽  
Railway Stations ◽  
Route Network ◽  
Technological Assessment ◽  
Technological Evaluation

Purpose. The purpose of the work is to determine the directions for improvement the methods of formation of structures of track development of railway stations and their technical and technological assessment. Method. To determine the areas for improvement the methods of forming structures of track development of railway stations and their technical and technological evaluation, it is necessary to analyze the known scientific approaches, identify their weaknesses and strengths. Based on the analysis of these approaches to develop generalized procedures for the formation of rational structures of track development and evaluation of technical and technological parameters of railway stations. To develop the first procedure, it is necessary to choose the optimization criterion. Results. The paper analyzes the known scientific approaches to the formation of structures of track development of railway stations and their technical and technological evaluation. As a result, it was determined that the most effective way to calculate the design parameters of railway stations is to use automated design procedures, effective ways to calculate technological parameters and evaluate design decisions is to use simulation methods. The generalized procedures of formation of rational designs of track development of railway stations and their technical and technological estimation are offered. Scientific and practical significance. Improved procedures for the formation of rational structures of track development of railway stations and their technical and technological evaluation, which in contrast to the existing ones are based on determining the costs of the railway station with the cumulative total for the calculation period or project life cycle. The implementation of rational design solutions will ensure the implementation of the specified size of train and shunting operations of railway stations with a sufficient reserve of capacity and minimum costs. In addition, the results of technical and technological assessment of track development structures can be the basis for adjusting certain requirements for the construction of station necks.

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.

Воздействиеультразвуковогополянадинамическуювязкостьводы

2019 ◽  
pp. 27-29
Author(s):  
P. Vikulin ◽  
K. Khlopov ◽  
M. Cherkashin
Keyword(s):  
Dynamic Viscosity ◽  
Experimental Studies ◽  
Ultrasonic Field ◽  
Maximum Effect ◽  
Ultrasonic Frequency ◽  
Ultrasonic Vibrations ◽  
Wastewater Disposal ◽  
Laboratory Setup ◽  
Sonic Treatment ◽  
The Impact

Enhancing water purification processes is provided by various methods including physical ones, in particular, exposure to ultrasonic vibrations. The change in the dynamic viscosity of water affects the rate of deposition of particles in the aquatic environment which can be used in natural and wastewater treatment. At the Department Water Supply and Wastewater Disposal of the National Research Moscow State University of Civil Engineering experimental studies were conducted under laboratory conditions to study the effect of ultrasound on the change in the dynamic viscosity of water. A laboratory setup has been designed consisting of an ultrasonic frequency generator of the relative intensity, a transducer (concentrator) that transmits ultrasonic vibrations to the source water, and sonic treatment tanks. Experimental studies on the impact of the ultrasonic field in the cavitation mode on the dynamic viscosity of the aqueous medium were carried out the exposure time was obtained to achieve the maximum effect.Интенсификация процессов очистки воды осуществляется с помощью различных методов, в том числе и физических, в частности воздействием ультразвуковых колебаний. Изменение динамической вязкости воды влияет на скорость осаждения частиц в водной среде, что может быть использовано в процессах очистки природных и сточных вод. На кафедре Водоснабжение и водоотведение Национального исследовательского Московского государственного строительного университета в лабораторных условиях проведены экспериментальные исследования по изучению влияния ультразвука на изменение динамической вязкости воды. Разработана схема лабораторной установки, состоящая из генератора ультразвуковых частот с соответствующей интенсивностью, преобразователя (концентратора), передающего ультразвуковые колебания в исходную воду, и емкости для озвучивания. Выполнены экспериментальные исследования по влиянию ультразвукового поля в режиме кавитации на динамическую вязкость водной среды, получено время экспозиции для достижения максимального эффекта.

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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