The thresher can be divided into two types, full feed and half feed, according to its threshing method. All the crops are fed to the threshing device and threshing is called a full-feed thresher. Only the threshing head of the crop is fed to the threshing device, and the thresher after threshing to keep the stalk intact is called a half-fed thresher. The threshing machine can be divided into three kinds of simple type and semi-double type, according to the completeness of structure and function. The simple thresher has only a threshing device and can only take off the grains. The separation and cleaning work needs to be done manually or by other implements. The structure is simple and the price is low. The semi-duplex thresher has a threshing device. There is also a simple separation and cleaning device for the preliminary separation and cleaning of the threshing material; the double-type thresher has a perfect threshing, separation and rinsing device for threshing, compound threshing and multiple cleaning, and some The grain can be graded. The threshing machine has a complex structure and is bulky. According to the working requirements for threshing sails in crop harvesting, the thresher is required to have the following performance: High threshing efficiency The high threshing efficiency refers to the weight of the grain that is taken off per unit of time and per unit of power. 2. High denitrification rate The denitrification rate is the percentage of the weight of the grain that has been removed by the threshing device and the weight of the grain that was fed, and the requirement is over 99%. 3. Loss rate Low loss rate refers to the percentage of the Weight Loss of grains in various parts of the thresher during the threshing process and the total weight of the threshed grain. Total losses include net loss without loss, entrainment loss, cleaning loss, and splash loss. 4. Breakage rate Low breakage rate refers to the percentage of the total weight of kernels, broken kernels, cracks, broken shells (skins) in the grain removed by the thresher, and the total weight of the removed kernels, generally below 1.5%. 5. High cleanliness rate The cleanliness rate refers to the cleanliness of the grain after the crop has been threshed and cleaned (inconsistent spikes, grains with shucks, shredded stalks, glume and other debris). The cleanliness rate is the percentage of the pure kernel weight of the sample to the total weight of the sample. The requirements for the cleanliness of the semi-duplex thresher are over 96%, and the requirements for the compound thresher are over 98%. 6. Good versatility, strong adaptability to meet the needs of a variety of crop threshing, and better adaptability to crop dryness; minimize stalk fragmentation to facilitate the multiple uses of stems; able to adapt to rural A variety of power machinery.
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