Tagaroopsaha projekt
Laen...
Kuupäev
2019
Kättesaadav alates
4.09.2019
Autorid
Ajakirja pealkiri
Ajakirja ISSN
Köite pealkiri
Kirjastaja
Eesti Maaülikool
Abstrakt
Koostatud bakalaureusetöö on masinaehituslik projekt, mille eesmärgiks on töötada välja
põllumajandusliku väiketraktori tagarippsüsteemile haagitav tagaroopsahk. Olulisteks
alameesmärkideks on tagaroopsaha hõlma optimaalseima kuju ning hõlma hüdraulilise
pööramislahenduse konstrueerimine. Töö käigus viidi läbi turu-uuring Eesti tootjate osas,
selgitamaks välja sarnaste toodetavate tagaroopsahkade omadused. Projekteeritava
tagaroopsaha konstruktsiooni väljatöötamiseks koostati lähteülesanne. Bakalaureusetöö
sisulises osas teostati arvutused hõlma kuju disainimiseks, tugevusarvutused pöördtelje,
raami ja teiste detailide dimensioneerimiseks ning teostati hüdrosilindrite valik.
Tagaroopsaha mugavaks haakimiseks ja kasutamiseks on sahale lisatud statsionaarsed
veosõrmed ja toetusjalg. Töö koostamise käigus asuti seisukohale, et optimaalseim hõlma
lõiketera lõikenurk pinnase ja lume lõikamiseks on 45o
. Pinnase profileerimisel ja
lumetõrjel on hõlma sobivaim haardenurk 45o
. Töö koostamise käigus kirjeldati hõlma
hüdraulilise pööramise realiseerimise probleemi ning otsiti sobivat lahendust.
Tagaroopsaha hõlma pööramiseks 280o
ulatuses, et tagada võimalus tagaroopsahka
kasutada traktori edasi- ja tagasiliikumisel, konstrueeriti hõlma pööramissilindri korpuse
kinnituspunkti nihutamiseks vastav mehhanism. Lahendus võimaldab hõlma lihtsalt ja
mugavalt pöörata. Töö tulemusena töötati välja universaalse tagaroopsaha konstruktsioon,
mis laiendab oluliselt põllumajandustraktori kasutusvõimalusi ning esitatakse soovitused
tagaroopsahaga töötamise viiside kohta.
This bachelor’s thesis is a mechanical engineering project the aim of which is to develop a rear blade hooked on a rear lifting mechanism of a small agricultural tractor. An important sub-aim is to develop the most optimal shape of the mouldboard of the rear blade and a hydraulic turning solution for the mouldboard. In the course of the thesis, a market survey was conducted among the Estonian manufacturers to determine the characteristics of similar manufactured rear blades. A source task was set to develop the construction of the designed rear blade. In the substantive part of the bachelor’s thesis, calculations for designing the shape of the mouldboard as well strength calculations for dimensioning the rotational axis, frame and other details were made and hydraulic cylinders were selected. Stationary pulling pins and a support foot have been added to the blade for convenient hooking and using of the rear blade. Based on the design, it is believed that the most optimal cutting angle of the cutting blade of the mouldboard for cutting the soil and the snow is 45°. Upon profiling the soil and removing the snow, the most suitable entering angle of the mouldboard is 45°. In the course of writing the thesis, the realisation problem of the hydraulic turning of the mouldboard was explained and a suitable solution was searched for. In order to turn the mouldboard of the rear blade in the extent of 280° to ensure the possibility of using the rear blade when the tractor is moving forward and backward, a corresponding mechanism was constructed to shift the fixation point of the rotating cylinder housing of the mouldboard. The solution allows to turn the mouldboard easily and conveniently. The thesis provides suggestions on how to work with the rear blade. As a result of the thesis, a universal construction of the rear blade was developed which significantly widens the usage possibilities of agricultural tractors.
This bachelor’s thesis is a mechanical engineering project the aim of which is to develop a rear blade hooked on a rear lifting mechanism of a small agricultural tractor. An important sub-aim is to develop the most optimal shape of the mouldboard of the rear blade and a hydraulic turning solution for the mouldboard. In the course of the thesis, a market survey was conducted among the Estonian manufacturers to determine the characteristics of similar manufactured rear blades. A source task was set to develop the construction of the designed rear blade. In the substantive part of the bachelor’s thesis, calculations for designing the shape of the mouldboard as well strength calculations for dimensioning the rotational axis, frame and other details were made and hydraulic cylinders were selected. Stationary pulling pins and a support foot have been added to the blade for convenient hooking and using of the rear blade. Based on the design, it is believed that the most optimal cutting angle of the cutting blade of the mouldboard for cutting the soil and the snow is 45°. Upon profiling the soil and removing the snow, the most suitable entering angle of the mouldboard is 45°. In the course of writing the thesis, the realisation problem of the hydraulic turning of the mouldboard was explained and a suitable solution was searched for. In order to turn the mouldboard of the rear blade in the extent of 280° to ensure the possibility of using the rear blade when the tractor is moving forward and backward, a corresponding mechanism was constructed to shift the fixation point of the rotating cylinder housing of the mouldboard. The solution allows to turn the mouldboard easily and conveniently. The thesis provides suggestions on how to work with the rear blade. As a result of the thesis, a universal construction of the rear blade was developed which significantly widens the usage possibilities of agricultural tractors.
Kirjeldus
Bakalaureusetöö
Tehnika ja tehnoloogia õppekaval
Märksõnad
bakalaureusetööd, lõikenurk, adrad, mullaharimismasinad