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Příprava výukových materiálů: Harvestorová technologie
HAUSER, Jan
This work deals with the description of technology of harvestors forest logging. It describes the basic division of machines, description of harvestor parts, machines for special use. Finally it presents three companies and their offered models of machines with the largest representation of the harvestors in the Czech Republic.
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Hodnocení harvestorové technologie
KOČÍ, David
The aim of this bachelor thesis is try to compare machines for felling trees at two private entrepreneurs with the same production focus but different machines. The main comparison lies in the performance, fuel consumption and financial costs of individual work operations in a pre-designated area. All this information will be converted to the annual work output of the machines.
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Handling equipment for forestry
Martinec, Patrik ; Pokorný, Přemysl (referee) ; Hloušek, David (advisor)
This bachelor thesis is focused on a research treatise on a forest fleet. The beginning of the work outlines the historical development of machines in the woodworking industry, it also deals with harvesters and their individual division according to specifications. The work also focuses on important parts of the harvester such as the hydraulic crane and harvester head. In the same spirit of comparison and division, export tractors are developed in the work. The chapter of the last work summarizes wheel loaders and their use in the woodworking industry. At the end of the thesis, the individual goals and outputs of the bachelor's thesis are evaluated.
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Posouzení provedení prvních probírek dle velikosti použitého harvestoru s dopadem na budoucí růst a potenciální výnos z porostů
Suda, Ondřej
The thesis deals with the appropriateness of using two different combinations of harvester´s system for stand tending. The aim was to quantify differences using harvester´s system and found out which is more appropriate for intervention. The difference in the number of felling trees is using as key parameter. According to results is better for future development of stand using harvester´s which will create closer segmenting lines. The rest of trees in stand mean greater possibility of selection for subsequent thinning and higher possibility of yield in other interventions due to greater volume.
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Kvantifikace odchylek objemu dříví při jeho měření harvestory a rozbor jejich závislostí na vybraných faktorech
Lesák, Josef
This thesis focuses on the problems with determining the dimensions of the timber during the processing with the harvesters. This study discusses all the possible variations in measurements, their origin and a resulting impact on the volume of the timber. Furthermore, this thesis describes other methods of measuring timber, such as manual measurement or measuring by sensing proportions of the timber with a saw measuring frames. The emphasis is on the variances in the calculation formulas, particularly focused on the differences in setting the reading bark. The research is supported by two measurements in the field, more specifically on the spruce vegetation. During these field measurements we performed the cuts with harvesters on the amount of 6 trees which were subsequently transported to the sawmill for the standard electronic checks. The log performed with the harvesters were afterwards measured twice for the purposes of precise volume measuring.
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Technicko-ekonomické parametry harvestorového uzlu s mobilním trakčním navijákem
Černý, Lukáš
The dissertation explores the work with harvester technology with a mobile traction winch in sloping terrains. It deals with the efficiency of these machines in their technological varieties. A time measurement study was undertaken in the dissertation which studied the work of a harvester with a mobile traction winch and without a mobile traction winch during the toll logging of a centennial spruce stand. The time study was performed in eastern Slovakia to establish the differences in time consumption during the work cycles. Some minor differences had been detected during work tasks, however, these did not exhibit any effect on the mobile traction winch in the work cycles of logging one tree. Furthermore, the time study measured the effect on any changes in work productivity, which is required during the operation of the mobile traction winch. Besides the harvester, a time study of a forwarder with a mobile traction winch has been compiled. To establish the effect on the forrest environment of the harvester technology and the mobile traction winch, an evalution of damage to the soil in two technological varieties was performed in Slovakia and the Czech republic. The technological variety with a mobile traction winch was less damaging to the soil surface due to the prevention of wheel slipping destpite the fact that the overall results of soil damage were negative. An operating cost analysis has been worked out to complete the study, which has shown the technological variety with the mobile traction winch to be more costly due to the purchase price of the winch and the higher fuel consumption. The main advantage, however, is safety, not cost savings.
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Příčiny nehod operátorů při práci s lesnickými harvestory a forwardery
Sláma, David
The aim of this bachelor thesis was to elaborate general information on the given topic, to evaluate and process the data obtained from individual operators and to subsequently perform statistics and graphical analysis of actual and potential causes of accidents of harvester and forwarder operators. The data were collected through semistructured interviews and questionnaires. In the semi-structured interviews, the real causes of accidents were investigated while potential causes of accidents were investigated in the questionnaires. The questionnaire method examined climatic, natural and soil conditions as well as human factors. The subject of investigation was the analysis and evaluation of the potential as well as actual causes of accidents.
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Zhodnocení využití těžebně dopravních technologií u Arcibiskupských lesů a statků Olomouc s.r.o., polesí Chvalčov
Putala, Martin
This thesis is focused on recommendation of the use of effective and acceptable measures in context with current solution of growing salvage harvesting of timber. The thesis is separated into two parts. The first part leads to the selection of optimal logging technologies in accordance with chosen criteria. The selection criteria are edaphic category, slope inclination, terrain type, age of the area and the representation of woody plants. The priority of the set criteria is the selection of spaces intended for the use of harvester technologies due to the high portion of salvage harvesting of timber. Other commonly used logging technologies are proposed in areas which exclude the use of harvester technologies. In connection to excessive timber harvesting, the second part is focused on the removal of timber from the area of interest with the characterization of the use of paired transport on forest roads. An analysis of timber removal form LHC Chvalčov has been made alongside with a proposal containing minimal parameters for timber storage in connection to the use of paired transport and a map of LHC Chvalčov with marked places indicating timber storages suitable for paired transport.
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Využití odkorňovací hlavice harvestoru v podmínkách kůrovcové kalamity
Mergl, Václav
The aim of this thesis was to describe the use of debarking head of one grip harvester in the salvage logging. For this purpose, a time study was chosen in which debarking heads with usual tools were compared with debarking heads with debarking sets on five research plots with two machines. The manufacturing process was divided into several operations, which were evaluated separately. Specifically, it was divided into operations: searching, felling, fall of the tree, manipulation, delimbing, and ascertainment. In the next step the quality of debarking was observed, depending on the moisture and on the diameter of logs. Debarking heads were measured during the growing season. It was discovered that the debarking head with debarking set needed twice as much time to process the whole tree as a head with usual tools. Delimbing contributes more than half to this difference. Furthermore, it was discovered that debarking quality does not dependent on the log's moisture at the time of harvest but on the hydraulic pressure of knives and feed rollers. Considering dimensions, the central parts of logs were debarked the best. Following these evaluations, recommendations were made for the practice of using machinery with debarking heads and improving debarking quality.
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