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Pilový kotouč v procesu podélného řezání materiálů na bázi dřeva
Veselý, Přemysl
In this dissertation thesis there is listed characteristics of circular saw blades, their distribution, influence of construction adjustments on final behavior of blade in the process of machining, problematic of oscillation of blades a mutual interaction among quality of machined surface, noise and dust. The thesis covers the problems of oscillation of circular saw blades as when idling and operating - the cutting process; and by the use of three circular saw blades with different construction modifications. These aforementioned construction measures are also compared to each other due to the implementation of standard construction saw blades not only from the perspective of oscillation, but also from the perspective of the roughness of the machined surface and the analysis of wood waste generated during cutting and noise. In the theoretical part there is an analysis of available literature and scientific theses. It outlines the particular publications devoted to methods of determining the shapes of oscillation, determining critical, resonant and recommended speed, blade constructions, including possible modifications, the theory of cutting saw blades including determining the size and shape of the splints and the effects of noise on the work environment. An important part of this work is methodology involving direct measurements for detection of unstable states of discs (resonance and critical speed. In this section it is further evaluated measuring of the oscillation of the test saw blade and verification of the proposed methodology with a different and practiced, commonly known method, so called cold shapes: The author also seeks to explore and determine the effect of different tooth pitch and method of execution of slots along with soundproofing grooves on noise levels, the resulting quality of the machined surface of various wood. The generated waste is then analyzed for splitting wood particles in particular size group with the percentage of each chip. The results of the experiment are in discussion confronted with the available scientific theses, taking into account with normal operating conditions, of which the conclusion is drawn.
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Posouzení faktorů ovlivňujících koncentraci prachových částic při lisování píce
ŠŤASTNÝ, Vladislav
The objective of this diploma thesis is to assess the factors affecting the concentration of dust particles during forage pressing. For this purpose, five presses for square bales and five presses for round bales were selected. They were harvesting different kinds of straw. Thanks to measurement using an aerosol monitor, the concentration of dust particles during the harvest was detected. The measured values were evaluated and the amount of concentration of the dust particles between the square and round bale presses was compared. There were also set the methodological steps of the measurement procedure.
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Emise tuhých znečišťujících látek v chovu drůbeže
JANOUŠEK, Tomáš
Agricultural activities produce a number of dangerous wastes affecting the environment. One is powder produced in livestock production, in particular in stables factory farms. Particulate emissions from livestock buildings are particularly important for the closest neighborhood stables. It is the subject of conflicts between farmers and their neighbors. The source of dust in livestock buildings are mainly food (fine particles modified cereals and dried plants) renegade animal skin particles, urine crystals and particles of feces. The aim of this work is to determine the concentration of dust in the factory farming of chickens for meat. Secondly, the aim is to compare BAT (Best Available Technique - Best Available Technology) technology used in stables with the reference document BREF (Integrated Pollution Prevention and Control - Integrated Pollution Prevention and Control). Measurements were carried out on a Farma U lesa in Sudoměřice u Bechyně on a poultry farm in Horní Miletín.
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Pilový kotouč v procesu podélného řezání materiálů na bázi dřeva
Veselý, Přemysl
In this dissertation thesis there is listed characteristics of circular saw blades, their distribution, influence of construction adjustments on final behavior of blade in the process of machining, problematic of oscillation of blades a mutual interaction among quality of machined surface, noise and dust. The thesis covers the problems of oscillation of circular saw blades as when idling and operating - the cutting process; and by the use of three circular saw blades with different construction modifications. These aforementioned construction measures are also compared to each other due to the implementation of standard construction saw blades not only from the perspective of oscillation, but also from the perspective of the roughness of the machined surface and the analysis of wood waste generated during cutting and noise. In the theoretical part there is an analysis of available literature and scientific theses. It outlines the particular publications devoted to methods of determining the shapes of oscillation, determining critical, resonant and recommended speed, blade constructions, including possible modifications, the theory of cutting saw blades including determining the size and shape of the splints and the effects of noise on the work environment. An important part of this work is methodology involving direct measurements for detection of unstable states of discs (resonance and critical speed. In this section it is further evaluated measuring of the oscillation of the test saw blade and verification of the proposed methodology with a different and practiced, commonly known method, so called cold shapes: The author also seeks to explore and determine the effect of different tooth pitch and method of execution of slots along with soundproofing grooves on noise levels, the resulting quality of the machined surface of various wood. The generated waste is then analyzed for splitting wood particles in particular size group with the percentage of each chip. The results of the experiment are in discussion confronted with the available scientific theses, taking into account with normal operating conditions, of which the conclusion is drawn.
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Ventilation systems for agricultural buildings
ZDENĚK, Jakub
Theoretical part of my bachelor thesis deals with the description of ventilation systems and their certain parts used in agricultural objects. Practical part focuses on the description of post harvest line and possibilities of its ventilation system. Description and alterations were made for post harvest line Pluhův Žďár. The thesis analysis the current filter system and its alteration. There are parameters of both filter systems compared and evaluated in conclusion.
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Assessment of methods for measuring dust emissions in livestock production
ZAHRADNÍK, Ivan
The occurrence of dust particles suspended in the air is a problem not only in increased concentration in the vicinity of human dwellings, but also for livestock. The theoretical part of this thesis is focused on the dust with a focus on current legislation and the impact on human and animal organism. Based on the robust simulation were performed dust measurements at two different commodities livestock. With impinger DUSTTRAK was detected current dust and compared according to the specified phase beem day.
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The Health Risks Analysis in the Workplace of Stone Quarries, Measure and Evaluation
STODOLOVSKÁ, Květa
The purpose of this thesis was to evaluate the work environment of quarries. Four research questions were asked: What factors can be determined in the working environment of quarries? Are hygienic limits of the monitored factors in the work environment of quarries respected? What measures to protect the health of workers in the quarries are applied by the employers? Are the proposed measures to protect employees' health effective? The bachelor thesis was conducted as qualitative research. Conditions in two quarries in the South Bohemian Region were studied. For data collection, the technique of direct, disinterested and obvious observation, the study of professional literature, legislation, trial protocols and the findings obtained from interviews with managers were used. The data were processed by content analysis. In the theoretical part, I focused on individual risk factors in the work environment of quarries and on health risk assessment. In the practical part, I compared the measurement results with the health limits set out in Government Regulation No. 361/2007 Coll. laying down the conditions of health protection in the workplace, as amended, and in Government Regulation No. 272/2011 Coll. that lays down hygienic limits of noise and vibration. Individual professions were categorized according to Decree No. 432/2003 Coll., as amended. The factors assessed in the work environment of quarries were quarry dust, total and hand-transmitted vibrations, noise and physical strain. The lowest rated factors include dust and total vibrations. Hygienic limits were not always observed, and thus the employer is obliged to take measures to protect the health of employees. The most important step in the development of quarries is the purchase of new, modern machines and the overall modernization of production, resulting in reduction of the workers´ exposure to risk factors.
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Health Promotion in the Workplace in Concrete Conditions of a Textile Producing Company
PRŮCHOVÁ, Pavla
I prepared my thesis on Health Support at Workplaces under Particular Conditions of a Textile Factory. The main objective was to determine the company management?s activities in the field of health support. The second objective was to map the information provided to the staff on health support at the workplace, and the third objective was to propose the concept of a specific preventive programme. When preparing the concept of the preventive programme for the textile company I co-operated with the company management and with the company doctor. The reference group was represented by women employed in a textile plant in South Bohemia who worked in different workshops producing car seat covers, housing and children?s clothing. The work described in this thesis was carried out as quantitative research. For data collection I used anonymous questionnaires and the results of this research were plotted on graphs. The thesis is divided into a theoretical part and an empirical part. The theoretical part mainly deals with health support at the workplace, with an analysis of health risks at work including the impact of physical factors. At the beginning of the empirical part I set the goals and set out three hypotheses. Having analysed the collected data I found that H1, H2 and H3 were confirmed. The empirical section includes a description of the research technique which shows that more than 50 per cent of employees of the textile factory are overweight, then that there is a greater occurrence of health problems in the departments of sewing and embroidery machines and many women also had no idea of the meaning of health support at the workplace. According to the results it is possible to say that the textile company does not organize any physical activities or rehabilitative exercises for their employees. Based on the information I would recommend organizing sports courses, providing healthy canteen meals, reducing stress at the workplace and introducing dust extractors in order to reduce dust at the workplace. This thesis may bring the company better working comfort and help to improve the employees? health. The proposed preventive programme can also be a manual for employers in the textile plant in the field of health support at the workplace.
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