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Teorie separace obilní hmoty u tangenciální sklízecí mlátičky
Nedoma, Roman
The thesis deals with combine harvesters. At the beginning there is describedtheir historical development and division. It is focused on a process of getting grains from grain mass in tangential self-propelled combine harvesters. The process is described from the outset up to getting clean grains stored in the reservoir. The main theme is a separation process tied for walkers, which is dismantled in parts. This process includes kinematic and dynamic analysis of the mass point motion over the walkers. Further it includes a theory of sifting which is based on the dimensions. There is displayed a list of solutions that are used by manufacturers in their machines. The grain getting processtries to improve work of combine harvesters and make it more efficient. In the conclusion, there is depicted a comparison of thresherparameters made by various manufacturers.
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Teorie a konstrukce mlátících ústrojí sklízecích mlatiček
Remeš, Jan
The thesis describes the history and the history of threshing grain combine harvesters. The paper describes the types of threshing unit. They are given energy indicators, the main technical data threshing system and their calculation. The paper gives an overview of the performance categories, sales, capital costs, operating costs and on the percentage of combine harvesters on the market today. The following describes the structure threshing device manufacturers marks Case, Claas, John Deere and New Holland, and there is shown a graphical comparison of their technical parameters. The work describes the mass flow threshing mechanism. Theoretical calculation is expressed by the dependence of flow quantity on the length of the threshing drum and then compared with the actual measured values.
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Axiální mlátící ústrojí sklízecích mlatiček
Přibyl, Patrik
The work contains a description of the whole mechanism of axial combines a focus on hitting. The paper presents the main differences between the tangential and axial threshing mechanism, including their advantages and disadvantages. Since each of the world's most famous manufacturers is representative of the combine undergoing threshing axially. In conclusion, there are graphical representations of appreciating the combine from different perspectives.
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Crop flow improvements at the Power Flow header
Štelcl, Michael ; Červinka, Jan (referee) ; Kašpárek, Jaroslav (advisor)
The master's thesis is focused on a design of optimal working speed of auger and belt transporter which are parts of Power Flow header for standard type of combine harvester. In the master's thesis author suggest a new simplified theory of crop flow inside the Power Flow header. The thesis contain the factors which can affect the crop flow and comparison between the Power Flow and competitor's header. The thesis also contain geometrical characteristics of crop for four types of cereal.
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Hodnocení sklízecích mlátiček NEW HOLLAND s odlišným provedením hlavních funkčních částí
ZDRAŽIL, Daniel
This bachelor thesis is focused on cereal harvest where the most important elements are the combine harvesters. The thesis also describes the importance of cereals, the history of the combine harvesters and their dividing into groups. The bachelor thesis analyses the difference in the activity, productivity and quality of work made by combine harvesters of the same brand with different threshing device. In this thesis, there is also the comparison which is performed on the same fields during harvest of winter wheat and rape oil.
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Hodnocení sklízecí mlátičky JOHN DEERE S 680 s pásovým podvozkem při sklizni obilovin, řepky olejné a kukuřice
PILÁT, Jiří
The content of this thesis is evaluation of the JOHN DEERE S 680 combine harvester with tracked chassis, during harvesting grains, rape and maize. The theoretical part of my thesis is at first focused on the basic structural design of the combine harvester. In the second part it describes harvesting of maize using a combine harvester, mainly from the technological point of view. The practical part first describes the methodology, where are listed procedures and calculations required for the evaluation of a combine harvester. Furthermore, it contains the final evaluation of the quality of work of the combine harvester in terms of loss, throughput, the quality of crushing and dispersion of crop residues, fuel consumption, performance analysis, as well as the influence of tracked chassis on the performance of the combine harvester.
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Sklízecí mlátičky z hlediska hlučnosti a prašnosti
LÍKAŘ, Ondřej
The thesis is focused on the combine harvester in terms of noise and dust in the cabin, but also outside. The literature search is the basic data and concepts from areas combine harvesters, noise and dust. The actual measurements were carried out on the land at the four farmers. Measured the machines were different dates of manufacture. These are machines Fortschritt E 512 (1983), Fortschritt E 514 (1989), IH 2188 (1998) and Claas Avero 240 (2011). The results of measurement were graphically displayed and compared each other. The measured values were compared with the current legislation. These measurements showed that the noise does not just limit oldest machine. Dustiness been in this job for guidance only. Thanks dust measurements but we get a more complete view of the work environment in which the operator is exposed.
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Hodnocení sklízecí mlátičky s rozlišným provedením pojezdového ústrojí
BARÁK, Jan
This thesis describes chassis design of combine harvester and its types generally. This thesis is focused on Claas Lexion 750 Terra Trac Helmut combine harvester with crawler chassis. For each selected chassis and systems by global manufacturers of agricultural machinery are described main parts and their possible variants. Thesis includes practical methodical measurements, which provides details for the assessment of the losses, spreading quality, crushing quality, operating parameters, machine performance and fuel consumption. Next the effect of moisture on the losses, quality of spreading and crushing is evaluated. Furthermore, I compare effect of crawler chassis on performance and in the end is a simple analysis of investmend and operating costs and characteristics of the company. The aim of the thesis is to evaluate operation and work quality of combine harvester with crawler chassis at harvest of cereals and rapeseed in agricultural production and simple economical evaulation of the machine.
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Provozní hlučnost sklízecích mlátiček ve vybraném zemědělském podniku
FOJT, Miroslav
The bachelor thesis discusses the noise combine harvesters at the operator for different operating modes. They were measured in three combine harvesters of different ages. The first part deals noise, development and construction of combine harvesters. In the following part, the merasued values are assembled and processed in graphs. In conclusion, the combine harvesters are evaluated in terms of noise pollution and the results are compared with the valid legislation
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