Study on Cutting Effect of Sugarcane Cutter Blade

Comparative analysis of different blade structures The sugarcane harvesting machinery at home and abroad generally has two types of single-cutter and double-cutter, and the type of cutterhead and the number of randomizers are different. The blade mounted on the cutterhead directly cuts sugarcane. Key parts generally need to meet three conditions: tough, wear-resistant, sharp, and reasonably shaped. Toughness and sharpness are recognized conditions, but the shape is reasonable. It is still inconclusive. The blades used today are rectangular, trapezoidal and crescent. The most widely used blades of the previous two shapes are used. Three types of blades are now analyzed.

1.1 Cutting sugar cane stress analysis Three types of blades are mounted on the cutter head. The blade has two forms, one is a smooth wire edge and the other is a serrated edge.

Sawtooth cutting into the soil can be easily damaged, so the blade is mainly made of smooth wire.

It can be known from the relevant experimental research and kinematics simulation analysis that the blade of the cutter blade cuts the sugar cane most of the time in the middle of the actual cutting process. The rectangular blade cuts the sugar cane by cutting the blade when cutting the sugar cane; the trapezoidal blade cuts the sugar cane by cutting and cutting when cutting the sugar cane; the crescent-shaped blade cuts the sugar cane in a sliding manner when cutting the sugar cane . The force analysis of the three shape blades when cutting sugar cane is simple. According to the force analysis, the force of the rectangular blade cutting sugar cane is perpendicular to the center of the sugar cane, and there is no component on the cutting edge line, which is cutting the sugar cane by cutting and cutting; the trapezoidal blade cutting the sugar cane. The force analysis of the three types of blade cutting sugar cane is over the center of the sugar cane, and there is a component in the direction of the blade line and the vertical direction of the blade line. It is a combination of cutting and sliding cutting to cut sugar cane; crescent-shaped blade cutting sugar cane The force of the cane center is similar to that of the trapezoidal blade. The order of cutting force is that the rectangular blade is larger than the trapezoidal blade, and the trapezoidal blade is larger than the crescent blade; the order of the sliding force is that the crescent blade is larger than the trapezoidal blade, and the trapezoidal blade is larger than the rectangular blade. Cutting the cane with an impact force substantially perpendicular to the cane stalk will cause the sugar cane to break and tear, especially turning the two sugar cane near the cutting position into pieces, thereby causing heavy losses to the sugar cane. Therefore, the direct cut sugar cane effect is less effective than the slippery cut.

1.2 Kinematics analysis of blade cutting sugar cane The motion analysis is based on the motion law of known objects, and the trajectory, displacement, velocity, acceleration, etc. of some points on the object are obtained, and the motion performance of the object is analyzed from these physical quantities. In this paper, the mechanical system dynamics simulation software adams is used to simulate the trajectory of blade cutting sugar cane. The motion simulation of the process of cutting cane by three shape blades is carried out, and the trajectory of the cutting vertex and the cutting point of one blade is simulated, and the cutting effect of the blade is analyzed through the trajectory. The simulation trajectory of three shape blade cutting is shown in the simulation trajectory of cutting sugar cane from three shape blades. The trajectory of the rectangular blade is obvious through the cane straightness, the trajectory of the crescent blade is obvious through the sugar cane arc, and the trajectory of the trapezoidal blade passes through the sugar cane. The straightness is between the rectangular blade and the crescent blade. The tightness of the front and rear blades is most pronounced with rectangular blades, followed by trapezoidal blades and crescent blades. The results show that the rectangular blade cuts the sugar cane to cut more than the trapezoidal blade and the crescent blade. The trajectory of the crescent-shaped blade has the most significant degree of forward bending, indicating that the tendency to push forward the sugar cane is most significant and should be avoided.

Slitting effect and cutting effect analysis The cutting blade is mainly used to cut sugar cane in the form of cutting and sliding cutting. See the change in the blade wedge angle when cutting the cane with a blade. According to the theory of the cutting and cutting process, the larger the tangential displacement of the blade along the material, the smaller the normal pressure required for cutting, the smaller the angle, so the smaller the normal force required for cutting the material, the smaller The smaller the shear force. Compared with chopping, the cutting process of the former is long, and the frictional work between the wedge surface and the material is increased. Therefore, the total cutting work is larger than that of the latter under many cutting conditions.

In the case of cutting a sugar cane with a knife (or a few knives), the frictional work between the wedge surface and the material is small because of the instantaneous cutting.

Therefore, the total cutting power consumption is smaller than the cutting. The simulated trajectory cut by the blade has the best effect of cutting the sugar cane with a rectangular blade. If the knife is cut continuously, the cane will easily break the sugar cane. Compared with the process of integrated blade cutting, the power loss of the trapezoidal blade and the crescent blade cutting cane is smaller than that of the rectangular blade.

Conclusion Three kinds of different shapes of blade cutting cane force analysis and kinematics simulation analysis, it is concluded that the rectangular blade cuts sugar cane directly by cutting and cutting, which is easy to cause sugar cane to rupture; the crescent-shaped blade cuts sugar cane best by sliding cutting. The trapezoidal blade is second; the crescent-shaped blade trajectory has a tendency to push the side of sugar cane, which is easy to cause the sugar cane to push and break, while the trapezoidal and rectangular blades do not. In terms of power loss, the cutting method cuts the sugar cane to the largest loss, and the trapezoidal blade and the crescent-shaped blade have a small cutting power. Based on the above analysis, the crescent-shaped blade cuts the sugar cane best, the trapezoidal blade is the second, and the rectangular blade has the worst effect.