1. Select the appropriate operation period and time. The best time for wheat harvest is at the end of wax ripening and at the beginning of ripening. The operation time of the combined harvester should be determined according to the specific conditions of the weather, and the principle of late delivery and late delivery is generally adopted. Can use the morning crop is relatively wet this period of time, a more comprehensive technical maintenance of the locomotive, the evening dew down after the car. Harvesting during this time is not only more efficient, but also less costly.
2. Maintain proper stubble height. The stubble height should be determined according to the height of wheat and the level of the plot, generally 15 ~ 25cm is appropriate, and the pursuit of high productivity should not make the stubble too high. Otherwise, because the wheat level is different or when the locomotive crosses the ridge of field, the cutting table fluctuates, resulting in some wheat missed cutting. At the same time, the stubble is too high, the effect of the poa poa wheel is weakened, easy to harvest the wheat fell to the ground, resulting in losses.
3. Adjust the height and position of the dial wheel correctly. The position of the wheel should be adjusted according to the specific situation of the crop. In general, its high and low position should make the action of the potting plate in the cut crop 2/3 is appropriate; Its position before and after should depend on crop density and lodging degree and decide, when crop plant density is big and lodging, appropriate move forward, in order to enhance help He ability. Potting wheel position is high, potting plate easy to hit spike head; The position of the front, dial the number of crops increased. All of these tend to cause grain shedding and increase job losses, especially in the later stages of the job.
4. Pay attention to the wear of threshing mechanism during maintenance. The wear of grain bar or nail teeth and the deformation and wear of concave plate grid will affect the decleaning rate of wheat. Therefore, the use of a long time of the combine harvester, must be checked before the harvesting operation, for deformation parts or severely worn parts should be repaired or replaced in time. It is worth noting that this kind of repair should be carried out in a regular repair shop to ensure the stable work of the threshing drum.
5. The speed and clearance of threshing drum should meet the technical requirements. The speed of threshing drum and the size of threshing clearance are the important factors that affect the depuration rate of wheat. In order to ensure the stable rotating speed of the roller, the speed should not be changed by changing the size of the throttle, and the speed should not be reduced by reducing the throttle when crossing the ridge of field. In the operation, the crops should be fed evenly, and the amount should not be too large, so as not to affect the quality of threshing. The threshing gap should be adjusted according to the variety, maturity and humidity of the crop. The adjustment principle: under the premise of meeting the depuration rate, the threshing gap can be appropriately increased to reduce the wheat crushing rate and reduce the probability of drum blockage.
6. Check the working condition of the drafter frequently. In the whole operation process of combine harvester, the separation mechanism is the weakest link. The separation loss will be increased when the amount of exfoliation slightly exceeds the rated entry amount or when the stem is wet and the weed content is high. Therefore, in the operation, we should often check the straw blockage in the key box of the drafter and timely troubleshoot. The most commonly used methods are to reduce the feeding amount, choose the harvest time correctly and increase the stubble height appropriately.
7. Adjust the opening of cleaning screen and the air volume of the fan correctly. The air stream sieve is widely used in the grain cleaning device of combine harvester, and its operation quality depends on its adjustment and coordination to a great extent. Under normal circumstances, the opening of the sieve increases, the fan air volume decreases appropriately, can reduce the cleaning loss, but the cleaning rate decreases; On the contrary, the cleaning rate increases, the cleaning loss increases. Therefore, the adjustment should be considered as a whole, and the cleaning rate should not be one-sided. The adjustment principle: under the condition that the loss rate of cleaning does not exceed the standard, appropriately reduce the opening of the sieve and increase the air volume of the fan, so as to improve the cleaning rate of the grain.
8. Harvest lodging crops correctly. Appropriate reduction of stubble, in order to reduce missing cut; Poa wheel appropriate forward, poa spring teeth backward tilt 150 ~ 300, in order to enhance the role of poa; For the crops with more serious lodging, the measures such as reverse lodging direction, reducing machine speed or reducing feeding amount should be taken.
