The arrangement density and arrangement mode of the spatula

  For returning to the field, under the condition of the same operation width and the same cutter shaft speed, the increase of the number of blades will improve the effect of straw crushing. But the more the better, the number of knives should be an optimal value. The number of swinging blades was too few, the straw could not be cut and hit sufficiently, and could not meet the requirement of straw crushing. On the one hand, the no-load power consumption and starting torque increase, and the manufacturing cost increases; on the other hand, too much swinging blade makes it difficult to discharge the crushed straw quickly, which results in clogging and affects the crushing quality. The optimum value for the number of spatulas is generally determined by density.

  The spatula can be arranged in a single (or double) spiral, a star, or a symmetric arrangement. The general hammer eight type spinner adopts single (or double) spiral line arrangement; the R-type spinner is arranged in the square of star shape; straight blade slings adopt symmetrical arrangement. No matter which arrangement should meet the requirements: (1) The shaft force is uniform, meet the requirements of dynamic balance. (2) The radial Angle between two adjacent knives should be greater than 60°.

  The reasonable arranement of the swinging blade can not only improve the crushing quality of the returning machine, but also make the dynamic balance performance of the retuning machine good and run smoothly. In fact, there are many factors that affect the operation performance of field returning machine.Such as:moving fixed blade clearance;the working clearance from the end of the spinner to the casing wall;the linear velocity and kinetic energy of the blade and:the clearance of the straw inlet and outlet,the density,moisture content of the straw,and the imitational performance of the returning machine.Therefore,only by taking these factors into consideration,can the pulverization quality of the returning machine reach the best level.

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