scholarly journals GROUNDING PARAMETERS OF THE MILKING MACHINE PULLER

2021 ◽  
pp. 161-169
Author(s):  
В.М. УЛЬЯНОВ ◽  
В.А. ХРИПИН ◽  
Н.Е. ЛУЗГИН ◽  
В.И. ВАРАВИН ◽  
Д.А. ЖИЖНОВ
Keyword(s):  
Rotational Speed ◽  
Rotation Frequency ◽  
Theoretical Studies ◽  
Pneumatic Motor ◽  
Air Motor ◽  
Vacuum Line ◽  
Milking Machine

Проблема и цель. Теоретические исследования направлены на возможность расчета расхода воздуха и мощности пневмодвигателя съемника аппарата с вымени животного. Методология. Холостое доение доильным аппаратом весьма опасно для коров, так как помимо болевых ощущений на сосках вымени часто приводит к заболеваниям животных и их преждевременной выбраковке. Таким образом, важно не только полностью выдоить корову, но и вовремя отсоединить подвесную часть доильного аппарата от вымени животного. Для устранения холостого доения авторами предложена конструкция съемника, обеспечивающего отсоединение подвесной части доильного аппарата от вымени коровы по окончании доения автоматически. Он состоит из пневмодвигателя с редуктором и нити, намотанной на барабан. Результаты. При теоретическом рассмотрении работы съемника аппарата были выявлены аналитические зависимости расхода воздуха пневмодвигателя съемника от частоты вращения ротора пневмодвигателя, количества его лопаток и значения вакуума в вакуумпроводе. Выявлено, что с увеличением вышеуказанных параметров увеличивается и расход воздуха съемником. Авторами также проведены теоретические исследования, в результате которых определен ряд параметров пневмодвигателя: мощность и частота вращения барабана пневмодвигателя в зависимости от размеров барабана, расстояния размещения съемника от пола, угла наклона подвесной части и ее массы. Заключение. Результирующие формулы позволяют определить требуемую мощность на валу барабана и частоту его вращения для съема аппарата с вымени без падения на пол. Problem and purpose. Theoretical studies are aimed at the possibility of calculating the air consumption and the power of the pneumatic motor of the device puller from the udder of the animal. Methodology. Blank milking with a milking machine is very dangerous for cows, since in addition to painful sensations on the udder teats, it often leads to diseases of animals and their premature culling. Thus, it is important not only to milk the cow completely, but also to disconnect the hanging part of the milking machine from the udder of the animal in time. To eliminate blank milking, a puller is proposed that automatically disconnects the hanging part of the milking machine from the udder of the cow at the end of milking. It consists of a pneumatic motor with a gearbox and a thread wound on a drum. Results. When considering the operation of the puller, analytical dependences of the air fow rate of the puller pneumatic motor on the rotational speed of the air motor rotor, the number of its blades and the vacuum value in the vacuum line were revealed. It was found that with an increase in the above parameters, the air consumption of the stripper also increased. There were also studies, as a result of which a number of parameters of the pneumatic motor were determined. They included the power and rotational speed of the drum of the pneumatic motor depending on dimensions of the drum, the distance of the puller from the foor, the angle of inclination of the suspension part and its mass. Conclusion. The resulting formulas make it possible to determine the required power on the drum shaft and its rotation frequency for removing the apparatus from the udder without falling to the foor.

scholarly journals Simulation of activational grinding for rhombic sulfur particles in a disintegrator (pinned disc mill)

2016 ◽  
pp. 10-20
Author(s):  
Farit Urakaev ◽  
Ismail Massalimov ◽  
Talgat Yusupov ◽  
Bolat Uralbekov ◽  
Batukhan Tatykaev ◽  
...  
Keyword(s):  
Dynamic Characteristics ◽  
Rotation Frequency ◽  
Inelastic Collisions ◽  
Complete Picture ◽  
Theoretical Studies ◽  
Mechanical Processing ◽  
Optimal Conditions

Based on the theoretical studies, complete picture of a mechanical processing of sulfur in the disintegrator is given. Kinematic and dynamic characteristics of elastic and inelastic collisions of particles of processed rhombic sulfur with rows of disintegrator fingers are calculated. Based on the analysis of the obtained dependency of the rotation frequency of the rotors offers, advices on selecting optimal conditions for activation milling of α-sulfur in the disintegrator are given. These results can be partially used in the processing of sulfur and in other types of shock grinding devices, in particular, jet mills.

scholarly journals THEORETICAL RESEARCH OF THE INFLUENCE OF THE CUTTER ON THE PROCESS OF GRINDING VEGETABLE RESIDUES OF THICK-STEM CROPS BY PROCESSING BANDS

2020 ◽  
pp. 113-123
Author(s):  
M.M. Korchak ◽  
T.V. Dudchak ◽  
D.V. Vilchynska
Keyword(s):  
Dynamic Properties ◽  
Rotation Frequency ◽  
Energy Performance ◽  
Theoretical Research ◽  
Plant Residues ◽  
Theoretical Studies ◽  
Technological Parameters ◽  
Rotating Speed ◽  
Operating Modes ◽  
Working Bodies

Theoretical studies of the milling tillage working body, in particular, dynamic properties under conditions of periodic external load, are substantiated and the main technological parameters are substantiated, and energy performance indicators are analyzed. The following data were adopted as the initial data for theoretical studies of the milling working body: the size of the row-spacing and strips, the dimensional characteristics of the root and stem residues. Theoretical studies of the milling machine gave such justified results: the diameter of the milling drum Dfr.bar = 0.3 m, the rotation frequency of the milling drum nfr.bar = 190 ... 430 hv-1, the number of installed knives on one disk n = 4 pcs, the rotating speed Vob = 6.59 m/s. Rational parameters and operating modes are justified: milling power Nfr = 19.3 kW, torque on the milling drum shaft Mkr = 0.45 kN·m. Theoretically substantiated milling working body is implemented in the development of a combined grinder of plant residues of thick-stem crops. The investigated working body, which performs the technological process of grinding compacted plant residues of thick-stemmed crops with the proposed technology, will allow us to further substantiate in more detail the mathematical model of the combined method of processing the field clogged with plant residues and determine the structural and technological structure of the grinder. The further development of the theoretical foundations of grinding plant residues and soil, in particular milling working bodies used in combined units, has been obtained

scholarly journals THEORETICAL JUSTIFICATION OF SOME STRUCTURAL-TECHNOLOGICAL PARAMETERS OF MILKING MACHINEWITH DRIVING DRIVING MODE

2020 ◽  
pp. 16-26
Author(s):  
Ihor Babyn ◽  
Anatoliy Hrytsun
Keyword(s):  
Milk Production ◽  
High Vacuum ◽  
Design Parameters ◽  
Theoretical Studies ◽  
Technological Parameters ◽  
Machine Milking ◽  
Mode Of Operation ◽  
Milking Machine ◽  
Technical Solutions ◽  
The Impact

An analysis of the technical solutions of milking machines with controlled vacuum mode and theoretical studies of the operation of the milking machine actuator, which allows to reduce the vacuum load on the udder and the impact on the sphincter of the cervix and prevent "idle" milking in high vacuum in the machine process. The completeness of milking cows and reducing the incidence of their mastitis depends to some extent on the operation of milking equipment. Performance indicators of the technological process of serial milking equipment do not always fully comply with the current zootechnical requirements. During their work at the beginning and at the end of the milking of the animal there may be a process of "idle" milking at high vacuum, which often leads to the disease of animals with mastitis and subsequent culling. Along with the increase in milk production, quality is becoming extremely important. The analysis of the known technical solutions of milking machines with a controlled mode of milking shows that the domestic and foreign industry do not produce milking machines with a controlled mode of milking, which fully correspond to the physiology of animals. In our opinion, the most effective one is to consider a milking machine with a low-inertial milk flow sensor, which controls the vacuum mode, both in poddyah and interstitial chambers of milking glasses. Conducted theoretical studies of the working process of machine milking allowed to systematize the engineering calculation method of milking machine with a controlled mode of operation and to determine the optimal design parameters of the actuators. The analytical expressions obtained characterize the influence of their parameters and mode of operation on the dynamics of milk production during machine milking of cows.

scholarly journals Research on Drilling Rate Optimization of a UCS Identification System While Drilling for Coal Mine Roadway Roofs

Machines ◽  
2021 ◽  
Vol 9 (10) ◽  
pp. 242
Author(s):  
Guangdong Yu ◽  
Qian Hu ◽  
Xuewen Feng ◽  
Guoying Meng ◽  
Yifan Nie
Keyword(s):  
Compressive Strength ◽  
Real Time ◽  
Output Power ◽  
Uniaxial Compressive Strength ◽  
Coal Mine ◽  
Identification System ◽  
Drilling Speed ◽  
Pneumatic Motor ◽  
Air Motor ◽  
Mine Roadway

In this paper, to identify the roof unconfined compressive strength (UCS) in the process of coal mine roadway support in real-time and optimize the real-time drilling speed while drilling, this paper proposes and establishes a drilling test method for assessing the uniaxial compressive strength (UCS) of a roof. This method can be used to optimize the speed of drilling. Moreover, a mathematical model of the power output is developed for a roof-strata identification system with a drilling test system. The results were as follows: (1) the system was able to identify the uniaxial compressive strength of roof rock; (2) the pressure of the drill leg of the pneumatic bolt did not match the output power of the pneumatic motor, the pneumatic motor could not reach the maximum power point, and the insufficient thrust of the pneumatic leg led to failure of the maximum output power of the pneumatic motor; (3) to increase the output power of the air motor and thus improve the drilling speed, we applied a booster valve for the system. The experimental results show that the power of the air motor has a linear relationship with drilling speed. In this way, the speed of the drill can be increased by increasing the motor power.

scholarly journals INVESTIGATION OF THE POSSIBILITY OF USING A VORTEX HEAT GENERATOR IN HEAT SUPPLY SYSTEMS FOR RESIDENTIAL, INDUSTRIAL AND PUBLIC BUILDINGS

2018 ◽  
Vol 61 (2) ◽  
pp. 159-166 ◽  
Author(s):  
I. L. Iokova ◽  
E. N. Tarasevich
Keyword(s):  
Energy Conversion ◽  
Rotational Speed ◽  
Heat Supply ◽  
Conversion Factor ◽  
Rotation Frequency ◽  
Heat Supply System ◽  
National Academy Of Sciences ◽  
Heat Generator ◽  
Heat Supply Systems ◽  
Supply Systems

In a number of foreign countries, vortex heat generators have become widespread in decentralized heat supply systems. For Belarus, vortex heat generators are quite new sources of heat supply. The article considers the possibility of using vortex heat generators for heat supply systems for residential, public and industrial buildings. Vortex heat generators are based on the principle of cavitation in a turbulent water flow. For many devices cavitation is not desirable, but in a vortex heat generator it is used as a favorable phenomenon. The authors carried out a series of full-scale experiments to determine the efficiency of the “VTG-2.2” vortex heat generator when different operating modes were applied. The performance of the vortex heat generator can be estimated by the energy conversion factor. Energy conversion factor is the ratio of the amount of thermal energy that a vortex heat generator generates to the amount of electrical energy consumed. Experiments conducted in a number of research organizations (including the National Academy of Sciences of Ukraine and MPEI) have demonstrated that energy conversion factor can exceed 1. The authors conducted experimental tests with the use of an experimental installation simulating a heat supply system. According to the obtained experimental data, the energy conversion coefficients for each mode were calculated. The constructed graphical dependencies clearly demonstrate that, with increasing rotational speed of the vortex heat generator, the efficiency of its use increases. The highest energy conversion factor value was 61.1 % with a rotation frequency of 40 Hz. It was also found that with increasing the rotational speed of the vortex heat generator, a significant increase in noise and vibration occurs.

scholarly journals MODELING TRANSIENT PROCESSES OF DIESEL-GENERATOR SET WITH VARIABLE ROTATION FREQUENCY ON THE BASIS OF ACTIVE VOLTAGE RECTIFIER

2019 ◽  
pp. 94-104
Author(s):  
Dmitry Sergeevich Kobyakov ◽  
Oleg Stanislavovich Khvatov
Keyword(s):  
Control System ◽  
Internal Combustion Engine ◽  
Fuel Consumption ◽  
Rotational Speed ◽  
Combustion Engine ◽  
Rotation Frequency ◽  
Internal Combustion ◽  
Specific Fuel Consumption ◽  
Diesel Generator ◽  
Power Circuit

The variants of transformerless power topologies of ship diesel generator sets of variable rotational speed are considered. A power circuit of a diesel generator set of variable rotational speed on the basis of an active voltage rectifier and a buffer energy store, which has the highest efficiency in terms of weight and size and performance, is proposed. A block diagram of a control system for semiconductor converters as part of a diesel generator set of variable rotational speed is presented. The control system of the active voltage rectifier is implemented upon the principle of regulation according to the position of the generalized voltage vector of the network. In order to increase the energy efficiency of the inverter diesel generator set there has been developed the algorithm for smooth control of the rotational speed of the internal combustion engine using setting mechanism of suspend mode. The proposed algorithm (gradient descent method) is borrowed from the neural network technologies and allows calculating the rotation frequency of the internal combustion engine shaft corresponding to the minimum specific fuel consumption when operating at the current fractional load. In MatLab Simulink computer environment a simulation model of a variable-frequency diesel generator set based on active voltage rectifier was developed and transients were studied. The results of simulation modeling of the dynamic modes of the load switching have been presented, taking into account its size and nature; the indicators of the specific fuel consumption of the internal combustion engine as part of a diesel generator set of variable rotational speed are presented, as well. Using a variable-speed diesel generator set based on an active voltage rectifier has been proved to allow ensuring the required quality indicators of the generated electricity when the internal combustion engine is operating at lower energy-efficient rotation frequencies in the fractional load mode.

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