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Analytická studie soudobých mechanizačních prostředků pro zemní práce v LH
Václavek, Tomáš
The bachelor thesis deals with an analytical study of parametres of mechanization machines for earthworks and their factors of application in forestry activities. The technique for earthworks is described in technical literature, where the typical features of different groups of mechanization machines for earthworks are described with differentiated utilization. The practical part compares the parameters of the earth moving machines, where their characteristic factors are taken into account when performing earthworks in forestry. On the basis of appropriate criteria, the technical and economic parameters are compared with a model study of selected earth machines, such as the Locust 752 front wheel loader and the Neuson 3003 miniexcavator, while repairing the model forest path. All aspects of practical research are described in the methodological section. The final part evaluates the parameters of machines for earthworks and also technical-economic results in the repair of the model forest path.
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Hydrostatic drive of multi-purpose loader DAPPER
Vydra, Tomáš ; Merenda, Lukáš (referee) ; Škopán, Miroslav (advisor)
This thesis deals with design of hydrostatic drive for multipurpose loader and tool carrier DAPPER. At the beginning is research of different basic concepts and modern solutions to the problem, aided by a detailed description of competitive machine in the same performance category. Extensive comparison with other producers is included in the annexes to this thesis. Furthermore, a theoretical driving characteristic and its appropriateness is examined further on the basis of two model situations. The calculations of the individual components of the hydraulic circuit precedes drive kinematics analysis of articulated machine frame, on it final conception of hydrostatic drive is chosen. Firstly hydromotors and hydogenerator are chosen on the grounds of calculations then hydraulic hoses, filters and flow divider. Next chapters are aimed to calculations of hydraulic losses and thermal calculation of hydraulic circuit. Final part deals with introduction the final characteristics of drive. The practical parts of the work are assembly drawings with main power components and hydraulic schematic of drive.
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The engine unit of a loader
Vaněk, David ; Škopán, Miroslav (referee) ; Kašpárek, Jaroslav (advisor)
This paper deals with a design of wheel loader’s engine unit and its performance, as well as the choice of suitable unit itself. Theoretical part describes a standard approach used in designing loaders in the performance and weight class according to the parameters listed and also introduces common designs of loader’s individual parts. It gives the reader an overview of various machines currently available on today’s market and their comparison. The second part of the thesis consists of performance design and calculations based on the comparison of performances needed for various working modes of the machine, where the performance are calculated as a sum of partial performances of differents parts of machines. The result of this paper is a choice of motorized unit that suits all the designed and calculated parameters.
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The engine unit of a loader
Koksa, David ; Škopán, Miroslav (referee) ; Kašpárek, Jaroslav (advisor)
The work is focused on loading construction machinery and their engine units. The theoretical background research introduces the domain of wheeled loaders. Subsequently, three specific machines, which are available on the market, are selected from a similar model range. They are selected according to the specified technical criteria. Individual power requirements for various modes of operation are calculated according to a suitable algorithm. These power requirements are summed up to obtain the needed total power. Based on the calculated value of the total power the suitable engines from various producers are proposed at the end of this work. This was the goal of the work.
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Grapple saw for wheel loader
Roguljić, Adam ; Kubín, Martin (referee) ; Kašpárek, Jaroslav (advisor)
The aim of this thesis was to design and construct a claw collector for a pre-selected wheel loader. The loader was chosen based on the basic parameters of the specified machine (engine power, the useable load of the machine, the hydraulic system pressure and weight of the machine). The collector is used for the unloading or loading of wood material, in this case, the raw wood in the form of logs harvested and stored on a freight truck or vice versa. The load capacity of the claw collector is specified at 4500 kg. For the drawing documentation I used the graphic programs based on the CAD platform. Specifically, the program that I have chosen was AutoCAD from the software company Autodesk. I performed a preliminary calculation of strength and stability control of the machine. In addition I also prepared the complete design documentation in the form of drawings which include the detailed shop drawings of individual parts of the machine.
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Exploitation skid steer loaders possibility.
Blažek, Jaroslav ; Kašpárek, Jaroslav (referee) ; Škopán, Miroslav (advisor)
The thesis deals with posibilities of uses for skid steer loaders. It considers this problem from the viewpoint of the finding of optimal machine. For these purposes the thesis contains well-aranged tables of 101 types of loaders, which are by 15 leading companies manufactured. On the basis of these tables are the categories created. In every category is on the basis of determining criteria choosen the most and the least optimal skid steer loader.
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Model Ranges Analysis of Wheel Loaders
Durna, Pavel ; Pokorný, Jan (referee) ; Kašpárek, Jaroslav (advisor)
The bachelor thesis deals with the division and parameters of the wheel loaders. Nowadays, there is an important representation of the bigger or smaller producers of the wheel loaders at the market. According to the size, weight and machine performance of the machine (wheel loader) is there a group of compact wheel loader, which is excelent because of manipulation, and a group of heavy line wheel loaders, which are usually used in quarry etc..
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