scholarly journals REDUCING SEED DAMAGE IN THE RAW COTTON SEPARATOR

2021 ◽  
Vol 53 (3) ◽  
pp. 48-51
Author(s):  
Orif Zh. Murodov
Keyword(s):  
Air Flow ◽  
Experimental Studies ◽  
Mechanical Damage ◽  
Air Flow Rate ◽  
Technological Parameters ◽  
Main Design ◽  
Seed Damage ◽  
Separation Chamber ◽  
Quality Of Products

The article discusses the design features of the CX cotton separator. As a result of the analysis, the main reasons are established that lead to increased mechanical damage to seeds, and, as a consequence, to a decrease in the quality of products of the cotton ginning industry. The modernisation of the existing design of the separator is proposed by installing a visor at the outlet of the air flow into the separating chamber. On the basis of experimental studies, a regression mathematical model was obtained, which made it possible to assess the influence of the main design and technological parameters on the mechanical damage of seeds. It was found that this parameter, in addition to the position of the visor, is significantly influenced by the air flow rate at the entrance to the separation chamber and the separator performance. Recommendations on the choice of the position of the visor are obtained.

scholarly journals The influence of brushing on the surface quality of aluminium

2018 ◽  
Vol 178 ◽  
pp. 01015 ◽  
Author(s):  
Uwe Teicher ◽  
Richard Schulze ◽  
Alexander Brosius ◽  
Andreas Nestler
Keyword(s):  
Surface Quality ◽  
Force Measurement ◽  
Experimental Studies ◽  
Cutting Speed ◽  
Technological Parameters ◽  
Milling Operation ◽  
Metal Machining ◽  
Modelling Methods ◽  
Main Influence

The extension of technical capabilities of machine centres for complete machining of components can improve their performance. In the field of sheet metal machining, the objective beside the classic milling operation was a generation of functional surfaces by face brushing. The experimental studies have probed the influence of tools and technological parameters on the surface quality. In addition to an analysis of the relevant roughness parameters the formation of the surface topography was analysed by several measurement methods. By the application of force measurement, the results of the surface quality can be interpreted additionally. It could be shown that the feed rate in contrast to the cutting speed has the main influence on the surface roughness. A peculiarity is given by the parameter-based width of cut that should be known for reliable process control. The acquired data can be applied in the form of process characteristic fields for further processing with simulation and modelling methods.

scholarly journals COMPARATIVE ANALYSIS OF TWO METHODS OF ELECTROEROSION FIRMWARE FOR DEAF MICROHOLES

2020 ◽  
pp. 136-144
Author(s):  
A. Boyko ◽  
D. Podpryatov
Keyword(s):  
Experimental Studies ◽  
Statistical Processing ◽  
Linear Wear ◽  
Tool Electrode ◽  
Technological Parameters ◽  
Electrode Tool ◽  
Limit Values ◽  
Two Samples ◽  
Micro Hole ◽  
Quality Of Products

The paper presents the results of experimental studies of the significance of differences in the technological parameters of electroerosive micro-hole firmware for two variants of the micro-hole firmware series process: without facing the tool electrode and with the tool electrode facing after processing each hole. The significance of differences in the technological parameters of the firmware process is established: by the wear of the electrode-tool, by the productivity of the process and the efficiency of the process as a whole. Detailed statistical processing of data from two samples of eight duplicate (parallel) experiments in each sample is performed to accurately assess the significance of the differences between the two variants of the process of electroerosive firmware of microholes. Calculations are made of the limit values of parameters of the microholes' electroerosion firmware: the relative linear wear of the electrode-tool and the process performance. They allow identifying and excluding doubtful experiments (artifacts) from the results, i.e. experiments with sharply distinguished results. The results of such experiments should be excluded from the statistical series, since they significantly affect the results of the experiment. The paper uses an exact method for determining the required number of duplicate experiments developed at BSTU named after V. G. Shukhov. The conducted research clearly shows the feasibility of introducing the electrode-tool in manufacturing to reduce the wear of the electrode-tool and, therefore, increase the quality of products with deaf microholes, for example, in the mass production of atraumatic surgical needles, the volume of production of which is millions of pieces per year.

scholarly journals RESEARCH OF THE POSSIBILITY OF INCREASING THE QUALITY OF PREPARATION OF DRY MIXTURES IN A HORIZONTAL VANE MIXER

2021 ◽  
Vol 6 (10) ◽  
pp. 99-108
Author(s):  
S. Khanin ◽  
N. Kikin ◽  
O. Mordovskaya
Keyword(s):  
Compressive Strength ◽  
Building Materials ◽  
Experimental Studies ◽  
Ultimate Compressive Strength ◽  
Regression Equations ◽  
Technological Parameters ◽  
Sand Mixture ◽  
Paddle Mixer ◽  
Mixed Material

Paddle mixers with horizontal shafts are common at building materials enterprises for the preparation of concretes, mortars, dry mortars. A new design of a horizontal paddle mixer with rod elements located in front of the working surfaces of the blades, changing the trajectories of material particles, increasing their mobility, which leads to an increase in the degree of homogeneity of the mixed material, is considered. The aim of the study was to assess the influence of rod elements on the quality of preparation of a cement-sand mixture, to establish patterns of influence on it by the design and technological parameters of a two-shaft paddle mixer and to determine the areas of their rational values. The following tasks have been solved. A bench installation of a two-shaft horizontal paddle mixer with rod elements has been developed, on which experimental studies have been carried out on the preparation of dry cement-sand mixtures. For the criterion characterizing the quality of the mixture, the ultimate compressive strength of the prism specimens made from it is adopted. Regression equations are obtained that adequately describe the compressive strength of prism samples from the design and technological parameters of the mixer: the angle of the blades, the distance from the working surfaces of the blades to the rod elements, the rotational speed of the blade shafts, and their analysis is performed. The analysis of the change in the ultimate compressive strength of the prism specimens from the parameters under study is carried out, the rational ranges of their values are determined. It was found that a mixer with rod elements allows to obtain a dry cement-sand mixture, products from which have a higher compressive strength. During the work, the method of mathematical planning of experiments was used. As a result of the study, an assessment of the influence of rod elements on the quality of preparation of a cement-sand mixture was carried out, the regularities of the influence on it of the design and technological parameters of a two-shaft paddle mixer and the area of their rational values were established.

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.

Numerical Simulation in Rear Axlecap of Automobile Drawing Process and Optimization of Technological Parameters

2010 ◽  
Vol 148-149 ◽  
pp. 1171-1176
Author(s):  
Ju Hua Huang ◽  
Li Xian Li ◽  
Ying Ying Wan ◽  
Jun Tuan Guo
Keyword(s):  
Numerical Simulation ◽  
Rear Axle ◽  
Element Model ◽  
Drawing Process ◽  
Work Efficiency ◽  
Technological Parameters ◽  
Simulation Results ◽  
Quality Of Products ◽  
The One

This paper takes the rear axle cap which is a typical automobile covering part as the research object. 3D and finite element model of it are built, and the drawing process is simulated with Dynaform, then the technological parameters are analyzed and optimized based on the simulation results, finally the part is compared with the one that is processed in practice. The results show that this method is easy and feasible, it not only increase the work efficiency greatly but also improve the quality of products.

scholarly journals JUSTIFICATION OF CONSTRUCTIVE-TECHNOLOGICAL PARAMETERS OF THE POTATO HARVESTING MACHINE

2021 ◽  
pp. 139-151
Author(s):  
Sergiy Hrushetskiy ◽  
Vitaliy Yaropud
Keyword(s):  
Comparative Analysis ◽  
Agronomic Performance ◽  
Labor Costs ◽  
Kinematic Parameters ◽  
Technological Parameters ◽  
Technological Processes ◽  
Comprehensive Mechanization ◽  
Quality Of Products ◽  
Working Bodies

For Ukraine's successful entry into Western markets, it is necessary to ensure the competitiveness of its own products, which is achieved through comprehensive mechanization of technological processes, reducing labor costs, increasing yields and quality of products. Accordingly, the aim of the study was to conduct a comparative analysis of structural and technological schemes of potato harvesters identified the most appropriate direction to improve existing and create new designs of potato harvesters, undermining working bodies and separators and substantiation of structural and technological parameters. The research was carried out by technological and structural analysis of technologies and machines for harvesting potatoes. In the process of research methods of comparison and mathematical modeling of technological processes were used. The information base of the research was the work of Ukrainian and foreign scientists on technologies and machines for potato harvesting. Based on a comparative analysis of technologies and machines for harvesting potatoes revealed the main processes affecting the agronomic performance of harvesting equipment, as well as the principles of influence of different separators on the potato heap showed that they use inefficient types of deformation, namely: impact and compression. Instead, studies suggest that tensile and shear deformations are much more effective, which are not realized in the current designs of the separators, or are only partially realized. On the basis of complex researches the technological scheme of the potato digger which working bodies (a ploughshare-shelf digger and a drum separator interact with a potato heap through deformations of a tension and shift that allows to separate effectively soil in various conditions of harvesting of tubers and other constructive and kinematic parameters is offered. potato harvester.

scholarly journals Choosing a Universal Air Collector Design for a Cylindrical-Shaped Hot-Wire Anemometer

2021 ◽  
Vol 24 (2) ◽  
pp. 6-15
Author(s):  
Oleh S. Tsakanian ◽  
◽  
Serhii V. Koshel ◽  
Keyword(s):  
Flow Rate ◽  
Measurement Errors ◽  
Air Flow ◽  
Aerodynamic Resistance ◽  
Experimental Studies ◽  
Flow Distribution ◽  
Hot Wire ◽  
Air Flow Rate ◽  
Measuring Device ◽  
Calibration Dependence

Air flow measurement at the outlets of air terminal devices installed in ventilation systems is very difficult. At the outlets of anemostats, swirl diffusers, grilles, the air flow can swirl, contract, or expand sharply, change its direction, etc., which causes great measurement errors. Therefore, it was necessary to develop a universal measuring device that would make it possible to measure air flow rate with high accuracy. It should consist of an air collector (for collecting and rectifying air flow) and a sensor for measuring air flow rate (integral hot-wire anemometer). Several air collector designs have been investigated. The parabolic air collector was chosen as the rational one. It has low aerodynamic resistance and good air flow distribution. To reduce the influence of turbulence and air swirling, a cylindrical stilling channel with a built-in rectifying grille is connected to the air collector. Experimental studies on various air distribution devices made it possible to obtain a refined calibration dependence for an integral hot-wire anemometer, the dependence being used to calculate air flow rate. The influence of the aerodynamic resistance of an airflow meter on air flow rate is taken into account with the help of a correction that must be introduced into the values measured.

scholarly journals THE INFLUENCE OF MIXER ROTATION FREQUENCY AND ITS BLADES LENGTH ON THE QUALITY OF THE MIXTURE

2019 ◽  
pp. 63-69
Author(s):  
Мария Фомина ◽  
Mariya Fomina ◽  
Алексей Чупшев ◽  
Aleksey Chupshev ◽  
Вячеслав Терюшков ◽  
...  
Keyword(s):  
Rotation Speed ◽  
Functional Dependence ◽  
Experimental Studies ◽  
Rotation Frequency ◽  
Technological Parameters ◽  
Blade Length ◽  
Blade Mixer ◽  
Mixer Rotation ◽  
Distribution Of Components

The aim of the study is the quality improvement of the feed mixture prepared and substantiation of the design and technological parameters of blade mixer batch- operated. The task is to set the functional dependence between the prepared mixtures quality and the empirical ratio of the intensity of mixing, taking into account the blades length in regard to values of the rotation frequency and the length of the blade of the batch-operated mixer, as well as the definition of rational length of the mixer blades. Improving the quality of mixture requires both the adding of all nec-essary nutrients and feed components into the volume of prepared portion of the mixture as stipulated by the recipe for mixture, and smooth distribution of components throughout the volume of ready feed. Smooth distribution of the mixture components is related to the design and operation of the mixer. Blade mixer batch- operated is one of the effective types of existing mixers, mixing the ingredients of feed with good quality. The article presents the result oriented design scheme of the blade mixer. Positive functions of the mixture quality and the empirical coefficient of mixing intensity included in their composition are assessed taking into account the length of the blades, depending on the rotation speed and frequency of the mixer. The graphic results of experimental studies taking into account the influence of the blade length and the speed of the mixer on the quality of the prepared mixture are given. The increase of blade length and rotation speed improves the quality of the mixture. Recommended blade length is 75...80 mm. With frequency of rotation increase and the length of the blades the total value of the empirical coeffi-cient of the intensity of mixing, depending on the effect of the length of the blades decreases at a slower pace. This is typical of the obtained hyperbolic dependence.

scholarly journals RESEARCH OF TECHNOLOGICAL PARAMETERS OF THE GRATED INSTALLATION

2020 ◽  
Vol 8 (1) ◽  
pp. 95-100
Author(s):  
Sergey Malyukov ◽  
A. Knyazev ◽  
Aleksey Aksenov
Keyword(s):  
Russian Federation ◽  
Experimental Studies ◽  
Rotation Frequency ◽  
Metal Consumption ◽  
Technological Parameters ◽  
Coniferous Trees ◽  
Seed Placement ◽  
The Russian Federation ◽  
Forest Seeds

Annual harvesting of a large number of forest seeds allows for reforestation on the territory of the Russian Federation. Moreover, more than 70% falls on the seeds of coniferous trees. In order to increase their sowing quality and reduce losses, the seeds are dehumidified, cleaned, sorted by density and size, stratification, as well as other technological operations. The use of refined seeds during reforestation allows increasing the productivity of sowing units, improving the quality of seed placement, reducing the volume of seed bins, which leads to a decrease in the metal consumption of sewing machines as a whole. For experimental studies, special sieves were made: plastic with chamfered, plastic with standard holes and plastic with rounded edges. The dependences of the completeness of separation of the procode fraction ε were determined for various combinations of the angle of inclination α and the rotation frequency of the working body ω for various seed thicknesses. The angle of inclination of the working body α was changed from 4 ° to 12 °, in increments of 2 °, rotation frequency ω from 400 min--to 1200 min-¹, in increments of 200 min-¹. The size gap was set taking into account the dimensional characteristics of existing sieves with rectangular holes and was 0.2 mm. Studies were conducted on the seeds of common pine.

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