The effects of operating mode of the gathering cylinder of pick up balers and the parameters of the rolled flax stock layer on the mass of its rolls

Abstract

The paper highlights the efficiency of using roll pickup balers for harvesting dew-retted flax stock. The research is aimed at specifying the effects of the operating mode of the gathering cylinder of ПР-1.2Л flax pickup baler with the bale chamber of accessory volume and ППР-110 hay pickup baler with constant volume bale chamber, as well as the parameters of flax stock layer rolled in bale chambers on the mass of formed rolls. Pickup balers where ganged up with МТЗ-80 tractor which work at the velocity of 4.26, 7.25 and 8.90 km per hour. Roll density controllers in the investigated pick up balers were fixed in the minimum, basic and maximum positions. The flax straw belt was spread by the flax combine which harvested Irma fibre flax variety with the coverage of 1.52m. The flax stock yielding capacity amounted to 21.7 centners per ha, and the linear mass of its belt - 0.33 kg/m. The operating mode of the gathering cylinder was evaluated by the bar step and by the flax mass which was separated and taken away from the spread belt mass by the fingers of a bar. The mode was also evaluated by the index of the gathering gathering cylinder kinematic mode. The correlations between the length and linear mass of the layer in relation to the length and linear mass of the flax stock belt which was picked up from the field to form a roll are taking as parameters of the flax stalk layer which was rolled in the gathering cylinder. The step of bars changed within the following limits: in ПР-1.2Л baler - from 177 to 313mm, and in ППР-110 baler - from 149 to 313mm. The flax stock mass which was separated and taken away by the fingers of one bar adopted the values in the following limits: in ПР-1.2Л baler - from 0.058 to 0.122 kg, and in ППР-110 baler – from 0.049 to 0.103 kg. The indices of the kinematic mode of the gathering cylinder of ПР-1.2Лand ППР-110 balers changed within the limits off 1.22–2.56 and 1.44–3.02 respectively. The correlation between the stalk layer length in the roll and the length of the flax stock belt which was picked up from the field by ПР-1.2 and ППР-110 balers changed from 0.512 to 1.1 and from 0.664 to 1.39 respectively. The correlation between the linear mass of flax stock layer in rolls and the linear mass of flax stock belt which was picked up by ПР-1.2Л and ППР-110 balers changed from 0.91 to 1.91 and from 0.54 to 1.18 respectively. The mass of flax stock roll formed by ПР-1.2Л and ППР-110 balers changed from 85 to 124 kg and from 90 to 140 kg respectively. Depending on the step of bars and mass of flax stock which was separated and taken from the mass of the spread flax raw belt, the change in the roll mass is described by the linear dependencies with negative slope coefficients. The change in the roll mass depending on the index of baling chamber kinematic mode is described by the equations of descending hyperbolae. The changes in the mass of rolls depending on the correlation between the length of stalk layer in the roll and the length of flax stock belt which was picked up from the field to form a roll is described by separate descending hyperbolae in relation to various pick up balers and the position of the roll density controller. Depending on the correlation between the linear mass of stalk layer in the roll and the linear mass of flax stock belt which was picked up from the field, the change in the mass of rolls is described by similar descending hyperbolae for both pick up balers, but by different hyperbolae as concerns the position of roll density controller.