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Разработана математическая модель пятиклавишного соломотряса зерноуборочного комбайна с двумя коленчатыми валами, кривошипы которых направлены радиально к вершинам пентагона, позволяющая рассчитывать реакции в шарнирах и параметры его статической неуравновешенности. По методу векторных контуров соломотряс представлялся в виде сочетания пяти однотипных шарнирных четырёхзвенников. Нагрузки звеньев от действия сил и моментов инерции определены методом кинетостатики. Розроблено математичну модель п’ятиклавішного соломотряса зернозбирального комбайна з двома колінчатими валами, кривошипи яких спрямовані радіально до вершин пентагона, що дозволяє розраховувати реакції в шарнірах і параметри його статичної неврівноваженості. За методом векторних контурів соломотряс представлявся у вигляді сполучення п'яти однотипних шарнірних чотирьохзвенник. Навантаження ланок від дії сил і моментів інерції визначені методом кінетостатики. The aim of this work is to determine the magnitude of the force impact on the frame of grain harvesters from the imbalance of key straw walkers. To achieve this goal, a structural, kinematic and power analysis of a five-key straw walker was carried out. Based on the performed structural analysis of the key straw walker, a design scheme with a combination of five similar articulated four-link mechanisms for the five-key straw walker of the grain harvester is presented. A mathematical model of a five-key straw walker of a grain harvester driven by a crankshaft with radial cranks has been developed, which allows calculating the reactions in the hinges and the parameters of its static imbalance. Using the method of closed vector contours, analytical dependences of coordinates, velocities and accelerations of characteristic points of links on the angle of rotation of the leading link are obtained. Using kinetostatic method, the dependences of the loads of the straw walker links on the action of forces and force moments of inertia are determined. The alternating character of the force action of each key separately on the bearings of the driving and driven straw walker crankshafts is established. The numerical values of the force action of the individual keys on the frame of the grain harvester, as well as the loads acting in the movable hinges of the straw walker, are determined. It is shown that the force action on the frame of harvesters from the straw walker can be balanced by the inertia of its keys. Static balance of the straw walker is achieved with a radial arrangement of cranks with placement of necks for fastening keys at the vertices of a regular polygon (for the five-key straw walker – the pentagon). One of the main conditions for the absence of the impact of the straw walker on the harvester frame is the manufacture of crankshafts with cranks radially directed to the vertices of the regular polygon and the exact implementation of design decisions in the production of harvesters.

Збірники наукових праць ЦНТУ

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