EXPERIMENTAL INVESTIGATIONS OF TYPE INDICATORS MEZ-330 «AUTOTRACTOR» DEPENDING ON ITS CONSTRUCTION PARAMETERS
DOI:
https://doi.org/10.31734/agroengineering2018.01.041Keywords:
mobile power tool, traction test, towing ratio, traction effort, wheel formulaAbstract
The article is devoted to the study of traction indicators mobile power MEZ-330 «Autotractor», in particular, to determine the rational value of its mass and air pressure in the tires of wheels. The paper presents a methodology for conducting experimental studies and presents measuring-recording equipment for performing traction tests. To create a drag, a T-150K tractor connected to a SCHRP-4-70 deep-ripper was used. During the experimental studies, the following parameters were changed: the mass of the MEZ-330 «Autotractor» and the air pressure in the tires of the wheels. The conditions and methods of testing complied with the requirements of GOST 7057.
According to the results of traction tests, graphical dependences were built, reflecting the influence of the mass of the MEZ-330 «Autotraktor» and the air pressure in the tires of its wheels on the tractive effort and slipping coefficient. An analysis of the experimental data showed that with an increase in the mass of the MEZ-330, the pulling force increases, but with an increase in the mass of more than 15,6 t, the power of the engine is not enough. According to the results of the tests, it was determined that with a 15 % shutdown and a mass of MEZ 11,4 t, the disconnection of the front axle reduces the traction effort of the MEZ-330 «Autotractor» by 38…39,4 %, and the disconnection of two bridges (front and rear) reduces by 70…73 %. It has been established that the MEZ-330 «Autotraktor» can be used to carry out traction technological operations requiring traction forces within 45…54 kN with the engine skidding at the level of 15 % without pumping. To perform more energy-consuming traction technological operations, the weight of the MEZ-330 «Autotraktor» was recommended to be increased to 15,5 t.
The results of the research allow us to conclude that the MEZ-330 «Autotraktor», in terms of its traction characteristics, corresponds to the characteristics of tractors of traction class 5.
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