Half-feeding combine harvester not threshing reason and solution

Half-feeding combine harvesters (such as Yanmar, Kubota and other models) have significantly better quality in harvesting methods, threshing quality, power consumption, etc. due to their unique application of crop gripping, threshing, and corresponding supporting technologies. Feeding models are more popular among farmers' friends. However, the phenomenon of threshing may sometimes occur during the harvesting operation, especially in the harvest of late rice in the region. This not only results in food loss, but also affects the quality of the harvester. From the analysis of various problems seen during the harvesting and maintenance services in the past few years in the city, the following aspects, namely, the technical condition of the harvester itself, and the external environment and operation technology, are specifically analyzed as follows: : One and a half feeding combine harvester has excellent working performance, but it has relatively high technical requirements for the working environment and the driver. Here we analyze one by one: (A) Crop Height: Half-feeding combine harvester is used Header, the crop is cut and conveyed by a series of conveyor chains, and then goes to the threshing chamber for threshing, so it has certain requirements on the height of the crop, such as the Yanmar combine harvester is 70-120cm, the limit is 55- 130cm, otherwise it will lead to too many crop heads or can not completely enter the threshing room and threshing caused by unsuccessful threshing. (B) The degree of ripeness of the crop: In the harvesting operation, some farmers often rush to harvest when the crop is not yet sufficiently mature to avoid being affected by the weather or other reasons. Therefore, the crop contains more water, and the grain and branch stem tension If it is large, it causes the threshing to be unclean. This phenomenon is still obvious when the harvesting speed is fast. (III) Operational techniques: When harvesting operations, operators do not perform harvesting in strict accordance with the operating procedures and mechanical design requirements, especially in the fierce competition in the current market. There are individual operators who seek speed and seize the economy. Benefits, regardless of harvest quality, are also the main cause of thrashing. To solve the above problems, the solution is: The operator should accurately grasp the speed of the vehicle, select a reasonable speed according to the maturity, growth status and output of the crop, and ensure that the threshing drum is not overloaded during the harvesting process, that is, the engine speed is basically at the rated rotational speed during the harvesting process. To ensure that the threshing drum speed, because lower than the standard speed will lead to reduced threshing ability and threshing is not clean; higher than the standard speed will result in cleaning loss. 2. To maintain the standard threshing depth, the operator should adjust the height of the crop in a timely manner, because the half-feed combine harvester does not allow all crops to be cut into the threshing chamber and allows only the head part to enter, so the threshing depth will be too deep. The increase of straw swarf in the barrel increases the work load on the threshing drum, which affects the normal work of the drum and causes the threshing to be unclean. Too light makes the ear of the crop unable to effectively enter the threshing chamber and cause leakage. 3. Choosing the correct direction of harvesting, the generally upright crop has little to do with it, and care should be taken when there is lodging, although the half-feed combine harvester can pick up the lodging crops through the abutment fingers on the header, but it is in harvest. Should pay attention to as far as possible in the direction of crop lodging, to achieve the first straighten the crop and then cut the work order requirements, absolutely prohibit the reverse harvest, so as not to cut the crop leading to cutting length is too short, resulting in one of the header transmission The parts are easily blocked; on the other hand, the crops cannot be effectively clamped, resulting in the drum being pulled into the threshing chamber and becoming fully fed into the working state, causing excessive load to fail to perform normal threshing. Second, in addition to the above external factors, the internal factors that are the working conditions of the combine harvester itself are very important. The main factors that affect the threshing quality are the header and the threshing chamber. (a) Header: Since the function of the header part of the harvester is to cut and convey the erect or fallen crop straight to the thresher, if there is an unbalanced amount of threshing and the crop is not properly conveyed in the header, We should carefully look at the header section and see if the distance between the left and right bifurcations is greater than the height of the cutting pair and the left and right bifurcations, so as not to crop the crops near the ends of the bifurcation. As the length becomes shorter, the crops that are sent to threshing are of different lengths, so that the ears of the crop cannot be gathered and the threshing is not complete. Second, a good cutter is the key and guarantee for the smooth operation of the whole harvester. Therefore, the cutter should be carefully inspected. If the gap between the cutters is too large and the blade is broken, the crops cannot be cut off in time when the harvester is working. The length is shorter than that of normal harvested crops, which results in different crop lengths and uneven ears during threshing. Also check the conveyor chain and guide rails. If the chains are not sufficiently tightened and the guide rails are worn, the clearance between the two is too large, resulting in insufficient clamping force. The crops cannot be tilted perpendicular to the chain during transportation, and the crops are tilted. The threshing chamber results in unclean threshing. To solve the above problems, the processing method is: The points on the left and right sides of the bifurcation should be aligned with the outermost fixed blade edge of the cutting knife so that the distance is equal to the cutting pair, and at the same time, full and side harvesting is avoided during harvesting. 2. The cutter blade should be replaced in time when the blade is missing or deformed. The clearance between the moving blade and the stationary blade should be adjusted in time (0.1~0.4mm). After the adjustment, the hand can be used to push the cutter bar. 3. Check, adjust the tension of the chain and make necessary repairs to the excessive wear of the guide rail to maintain the necessary clamping force. (2) If the header section is working properly, then we will focus on checking the working conditions of the threshing chamber. The threshing chamber is an important part of the harvester. Its processing capacity determines the working efficiency of the harvester and its working status. The quality of the harvester directly affects the threshing and cleaning performance indicators of the harvester. If threshing arches wear and bend, the wear of the concave screen mesh wire and the wear of the drum wall, etc., will cause the threshing gap is too large, so that the threshing effect is reduced, resulting in leakage. In addition, the threshing chamber inside the threshing knife has a great influence on the threshing quality. When the cutting knife wears, it will cause the long stems entering the drum to be cut off in time. The drum wrap phenomenon occurs, causing the work load of the drum to be too large to be normal. Threshing. The above solution is: 1. When the various types of bow teeth of the threshing drum, concave screen mesh, drum wall wear to the limit size should be promptly replaced to ensure the normal threshing gap. 2. Check the sharpness of the guillotine and repair or replace it if necessary to reduce the drum load. 3. The wear of the gravure screen strip and the feed strip on the feed chain should also be checked to ensure that the amount of overlap between the threshing arches and the strip (generally about 10 mm) enables the crop to be transported through the feed chain and transported through the strip. The crop was hit with a threshing bow to prevent it from falling and causing a lack of threshing. In summary, as long as we are in the harvesting operation, we will analyze, inspect, and deal with the problems that arise in time according to the work flow and working principles. Generally, the problem of threshing is not effectively solved, and the quality of the harvesting operation can be obtained. Guarantee.

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