Working parts of disc harrow, small disc harrow-tractor disc harrow

In the 1970 s, countries began to manufacture and use disc harrows,Small disc harrow,tractor disc harrow. The production and use of disc harrow in China began with the popularization of animal power disc harrow in the early 1950 s. In the 1960 s, 41 tractor disc harrows, 20 notched disc harrows and 24 offset harrows were produced. In the 1970 s, a series of disc harrows were developed for tractors from 18 to 55 kW, including more than a dozen models such as traction, suspension and semi-suspension.

disc harrowIt is a rake set with concave plates installed in series at a certain distance on the shaft. The concave surface of the disc is generally spherical, and some countries also use conical surfaces. There are two kinds of discs: full blade and notched blade. The former is simple to make and easy to grind; the latter has a strong ability to enter the soil, which helps to cut clumps and stubble weeds, and is widely used as a heavy harrow for heavy soil farming. The dimensions of the rake blades in different countries have been standardized and there are international standards.
Since the 1940 s, the United States has been using cross-rolled steel plate to make disc harrows. The center hole of the disc harrow blade is usually a square hole, separated by an inner tube. The rake blade and the inner tube are sleeved on the square shaft together and locked with a nut to form a rake group. When working, the plane of the disc cutting edge is perpendicular to the ground and forms an offset angle with the forward direction. Each rake set is supported by bearings on the frame.
During the operation, under the action of tractor traction and soil reaction force, each rake blade of the rake group rolls with the square axis. Under the action of the gravity of the harrow, the cutting edge of the harrow blade cuts into the soil, cuts off the grass roots or crop residues, and cuts up the plowed pieces, so that the soil rises slightly along the concave surface of the harrow blade, and then drops, which has a certain effect of turning the soil and covering the soil. The deflection angle of the rake group can be adjusted, the adjustment range is generally 0~30, and the general deflection angle is 10~25. Increasing the deflection angle can increase the depth of the rake, the effect of turning and breaking the soil, and the resistance will also increase.

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