Quality of friction drive moving spindels of cotton picking machine with vertical spindel

Abstract

Abstract The article provides some information on the quality of cleaning the external friction (V-belt) drive, which drives the spindles of the vertical spindle of cotton picking machine, produced in the Tashkent Agricultural Tractor Plant. It is known that the main indicator for assessing the technological process of the cotton picking machine is the level of harvesting of ripe cotton. The degree of picking depends on many factors, the most important of which is that the amount of rotation velocity of the spindle around its axis, which meets the cotton ball, does not change. Factually, the degree of picking depends on the amount of absolute velocity of the spindle tooth, which acts like a double-sided blade, especially on its direction, as determined by previous fundamental research [1-4]. The absolute velocity of the tooth is the geometric sum of the working velocity of the machine in the field Vm , the rotational velocity of the spindle drum Vb and the rotational velocity Vsh given by the rotation of the spindle around its axis. It is explained that since the motor of a machine used in the field is always running at rated velocity, the values of Vm and Vb remain constant, but for various reasons, the angular velocity of the spindle, i.e. the rotational velocity of the tooth, remains the same as the constructor fixed. If the velocity of a single Vsh changes, the absolute velocity of the tooth will change, and in some cases it will not be possible that the tooth cannot grind cotton. In a horizontal-spindle cotton picking machine, the “rigid” drive, which transmits motion to the spindles, ensures that the angular velocity of the spindle in the spinning zone is always within the limits set by the constructer. Therefore, its picking rate does not change. The disadvantages of the vertical spindle device are that the Tashkent Agricultural Tractor Plant does not pay attention to the fact that its parameters do not meet the technical requirements in the production of the above-mentioned friction drive for the spindle. For example, the tension of the three piston belts in a friction drive is not controlled in the assembly shop. Due to the fact that the tension of the belts is not the same, the pressure exerted by the belts on the spindle roller, and therefore the frictional forces that rotate the spindle, will be different. When the spindle tooth is stuck to the cotton ball and the resistance to rotation is increased, the angular velocity of the spindle decreases and the direction of the absolute velocity of the tooth becomes uncomfortable. The article examines the tension of the outer straps of the friction drive in 28 new devices assembled at the plant and presents the results of the analysis.