Calculation of pulling section of disc-belt flax-pulling device

Pullers are used to pull the fibre flax stalks out of the ground during mechanised harvesting. The most common are belt pullers and belt disc pullers. Pulling belts are made of rubber reinforced with kapron threads. They stretch during operation and need to be tightened periodically and replaced when worn. This type of puller is also very metal intensive. This article describes the design of the disc-belt flax puller, which will increase the life of the pulling belts and reduce the metal consumption of the flax pulling machine. The disc-belt flax puller consists of a pre-fabricated frame with partitions, a pulling device and a cross conveyor. The pulling device is made in the form of active pulling disks that contact with pulling belts, each of which is mounted on two rollers, one of which is spring-loaded. The proposed disc-belt flax puller contains fewer parts than known designs. Therefore, the proposed disc-belt flax puller has a lower metal capacity compared to its counterparts. The power required to drive the pulling section is determined, which consists of the power required to drive the press belt mechanism, to pull the flax stalks from the ground and to transport the stalks. The required pressure of the press belt on the pulling disc is determined on the condition that the flax stalks do not slip in the pulling pit during pulling. Taking into account the inertial load of the flax stalks during the movement of the curved pulling stream, the amount of pressure relief in the pulling stream was also determined. The required pressure in the draw stream is provided by tensioning the roving belt with a spring-loaded tensioning device. An improved design of the tensioning device is proposed. The required belt tension is calculated and the compression spring of the tensioning device is selected. The additional tension of the roving belt as the roving stream is filled with flax stalks is also determined. A hydraulic motor is selected to drive the picking section of the disc belt flax puller. A drawing sketch of the drive of the pulling disc was developed.