| 摘要 |
A drive of a feeder of a mineral fertilizer broadcaster includes a pressure roller pivotally mounted on a pivot arm and placed near one of the wheels of the machine, a bushing pivotally mounted on the axis near the pivot arm, a hydraulic actuator, one of the ends of which is connected to the frame of the machine, and the second one is connected the arm attached to the bushing, a roller, pivotally mounted on a pushing-off arm attached to the bushing, and a carrying roller track attached to the pivot arm, a spring, which is connected by one end to a bracket attached to the pivot arm and by the other end to a tension lever attached to the bushing, and is equipped by a tension device, made as a screw with a screw-nut and a lock-nut. According to the invention, the screw-nut is made with a cup,which is coaxial with opening thereof and which outer diameter is lesser than the diameter of the cylinder inscribed into the outer surface of the screw-nut, and the surface of the screw-nut connected to the outer side surface of the cup is made as a convex one. The cup freely passes through the opening of the bracket, the diameter of which is larger than the diameter of the cup, and the convex surface of the screw-nut contacts the edge of the opening of the bracket.
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