What’re Parts of Combine Harvester and Their Functions?

Many people are interested in combine harvester parts and functions, and this article is about Combine Harvester cutter head parts and their functions.

Overall Structural Design of The Header

The header of the northern rice harvester is a vertical header, and the intermediate transportation of crops from the header to the threshing mechanism adopts a clamping conveying device. The crops are conveyed upright, the base of the stem is clamped and conveyed, and near the ear, it is supported and conveyed by another chain with a finger, so that the ear of the stem slightly leans forward and gradually falls down, which is conducive to feeding into the threshing room.

The header is designed to be harvested in 4 rows. The 4 rows of rice harvested are 4 rows and 2 rows, 2 rows, and 1 row, and finally are clamped by the threshing clamping chain and enter the threshing chamber for threshing. At the same time, there is a feeding depth adjustment device on the header, which can adjust the position of the gripping stem base according to the variety and height of the crop.

harvester cutting head

Structural Design And Parameter Determination of Each Component of The Header

Grain dividing device

The crop separation device mainly plays the role of collecting and supporting the crops to be cut in this trip and separating the crops that will not be cut temporarily to avoid loss. The harvesting device is installed symmetrically on the left and right sides of the front end of the vertical header. In order to reduce the weight, the steel pipe is bent into a rod shape or a frame type.

grain supporter

When working, the spring fingers are inserted into the crop bushes from the roots, and the lodging crops are lifted up from the bottom to the top, which has a strong ability to support the lodging and combing of the stalks and can better meet the requirements of the semi-feeding combine harvester.

The working element of the graining device is the shifting finger mounted on the chain. The shifting finger rotates around the upper and lower sprockets with the chain. Each cycle process of the shifting finger consists of three stages: extending the finger, pulling the grain, and retracting the finger. Since the hoisting device moves with the equipment, the motion of extending the fingers and catching the wort is the combination of the rotary motion of the swiveling finger around the lower sprocket and the forward motion of the machine, and the motion of hoisting is the synthesis of the linear motion of the swiveling finger and the forward motion of the machine.

The trajectory direction angle δ generally takes a positive value, but it is often difficult to meet the work requirements when the operating speed is high.

Cutting device

The cutting device adopts a reciprocating cutter, the principle of which is to use the moving blade to perform a reciprocating shearing motion relative to the fixed blade on the blade guard to cut off the grass.

cutting device

Intermediate Conveying Device

The middle conveying device is composed of the left middle conveying and clamping chain, the left ear part conveying chain, the right middle conveying clamping chain, the right ear part conveying chain, the feeding depth adjusting device, and the pressing board on each chain. The crops in the middle row are finally collected in two parallels and conveyed together to the threshing drum. This kind of structure is mandatory, and the crops are always forced to be transported after being cut, and the state of the crops does not change much when they are paralleled, which does not affect the uniformity of the crops, and can meet the needs of semi-feeding and threshing.

The intermediate conveying and clamping chain is the bridge connecting the header and the threshing device, and its speed directly affects the working performance of the whole machine. If the speed of the clamping chain is fast, the layer of grass is thin, and if the speed of the clamping chain is slow, the layer of grass is thick. The relationship between the speed of the clamping chain and the thickness of the clamping layer is

Intermediate conveying device

The speed of the clamping chain (including the threshing clamping chain) is also related to the size of the clamping loss. The clamping speed is fast, the number of times that the grains are combed off by the bow teeth of the drum is reduced, the loss of uncleanness and entrainment will increase, and the rotation speed of the drum is limited by the quality of threshing. Therefore, the speed of the clamping chain and the length of the drum must have a certain proportional relationship. The thickness of the clamping layer is the basis for designing the expansion and contraction amount of the clamping spring and the height of the threshing bow teeth. The height of the threshing arch teeth should be greater than the thickness of the gripping layer.

Hydraulic Lift Mechanism

When the combine harvester is working, it is necessary to adjust the height of the stubble at any time, and often switch between the transportation state and the working state. Therefore, the header must be easy to raise and lower. The machine adopts a hydraulic lifting mechanism, which is sensitive and labor-saving in operation.

Feeding depth control device

The depth of stalk feeding not only affects the quality of threshing but also affects power consumption. If the feeding depth is too shallow, it is easy to cause leakage and increase the loss; if the feeding depth is too deep, the power consumption of threshing will be too large, causing the rotation speed to drop. Large waste removal.

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