163 Journal of Engineering, Mechanics and Architecture www. grnjournal.us AMERICAN Journal of Engineering, Mechanics and Architecture Volume 2, Issue 2, 2024 ISSN (E): 2993-2637 Research of the Movement of the Combination Machine Straightener in the Longitudinal-Vertical Plane Sh. P. Sharipov Assistant professor of the Institute of Engineering and Economics. Abstract: The article presents the results of the experimental studies conducted to study the influence of the opening angle of the soil pusher of the combined machine leveler used in the preparation of land for planting on the performance indicators of the leveler. Keywords: Combined, machine, leveler, parallelogram, mechanism, soil, pusher, compression, traction, resistance. Republic of Uzbekistan This article presents the results of studies on ensuring smooth movement of the combined machine leveler used in the preparation of land for sowing seeds in the longitudinal-vertical plane [1]. The leveler of the combined machine consists of plates attached to each other at a certain angle, which smooth the unevenness formed on the field surface by the softener and bullet-like claws of the machine. In this case, the leveler smoothes the bumps formed between the softener and the bullet-shaped claws by pushing them to the edges formed in their tracks. The leveler of the combined machine is connected to its frame by means of a parallelogram mechanism equipped with a compression spring. Since the physical and mechanical properties of the soil are variable, the Rx and Rz forces acting on the leveler during the operation of the combined machine (see the picture) are constantly changing during the operation. For this reason, during the operation of the machine, the leveler is not only in forward motion, but also in a vertical direction, that is, along the Z axis, it is also in a forced oscillating motion, which causes a change in its impact on the soil. This has a negative effect on the leveling of the field surface. It is self-evident that the amplitude of vertical forced vibrations of the leveler should be as small as possible so that the surface of the field is leveled at the same level along the entire length. To achieve this, a differential equation representing vertical forced vibrations of the leveler was created according to the calculation schemes presented in the figure. It has the following final appearance in this mT – the mass of the leveler, kg; V – coverage width of the leveler, m; VT – coefficient of adhesion of the soil per unit coverage width of the screed; ST – coefficient of compaction of the soil per unit coverage width of the leveler; l – the length of the longitudinal pull of the parallelogram mechanism, m; d – vertical distance between the hinges of the parallelogram mechanism, m; ΔRx (t), ΔRz (t) – Rx and Rz variable constituents of forces (moving forces); φT – angle of deviation of parallelogram mechanism pulls from horizontal position, degrees. 164 Journal of Engineering, Mechanics and Architecture www. grnjournal.us a) b) a, b are balanced and out-of-balance states of the leveler, respectively Scheme for studying the movement of the leveler in the longitudinal-vertical plane ΔRx (t) and ΔRz (t) if we assume that the forces change according to the harmonic law, the solution of the equation (1) representing vertical forced vibrations of the straightener and its amplitude will have the following forms [2] and in this n = 1,2,…, n1 – number of harmonics; ω – frequency of rotation of variable members, с- 1; (4) 165 Journal of Engineering, Mechanics and Architecture www. grnjournal.us (According to expressions 2) and (3), the same level of influence of the leveler on the field surface can be achieved mainly by the correct selection of the parallelogram mechanism's pressure spring and the angle of deviation of the pullers relative to the horizon. 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