Combine harvester

Abstract

The purpose of the present invention is to provide a combine harvester that can adjust threshing to an optimal state in order to make a loss amount calculated by a threshing drum loss sensor and a shaking loss sensor fall within a loss amount target range, and that can perform feedback control on the basis of the loss amount calculated by the threshing drum loss sensor and the shaking loss sensorand adjust the loss amount so as to fall within the loss amount target range by controlling a dust sending valve, a chaff sieve and vehicle speed. Provided is a combine harvester that is characterizedas follows: a loss sensor is disposed at the end of a processing path of reaped grain culm; the dust sending valve and the chaff sieve are connected to a control device; when the dust sending valve,the chaff sieve and a traveling section are subjected to feedback control in order to make a loss value calculated by the loss sensor fall within a loss amount target range, control is performed so asto first adjust the dust sending valve in the case where the loss amount exceeds the target range, adjust the chaff sieve upon reaching a dust sending valve limit value at which the measured loss amount cannot fall within the target range, and then adjust the vehicle speed upon reaching a chaff sieve limit value at which the measured loss amount cannot fall within the target range; and control isperformed so as to adjust the vehicle speed when the loss amount falls below the target range, adjust the chaff sieve upon reaching a vehicle speed limit value at which the measured loss amount cannot fall within the target range, and then adjust the dust sending valve upon reaching a chaff sieve limit value at which the measured loss amount cannot fall within the target range.

Description

technical field [0001] The present invention relates to the technique of detecting grain loss and controlling a dust valve, chaff sieve and vehicle speed related to grain screening according to the loss. Background technique [0002] Conventionally, the technique of the combine harvester which detects the loss amount of a grain is well-known. For example, as described in Patent Document 1. [0003] The purpose of the conventional combine harvester is to detect the wastage amount of grains in different parts by using both the threshing drum wear sensor installed under the rear part of the threshing drum and the swing loss sensor installed in the rear part of the swing screening device. Compared with the target value, the dust delivery valve and chaff sieve are controlled, so as to minimize the loss of grain and fully thresh and recover the grain. [0004] Usually, as the cause of the increase in grain loss, the following situations can be cited: (i) the threshing drum canno...

AI Technical Summary

Problems solved by technology

[0004] Usually, as the cause of the increase in grain loss, the following situations can be cited: (i) the threshing drum cannot be used for smooth threshing, and the amount of grain leaked from the rear end of the receiving net is large; (ii) Because the fin opening of the bran sieve of the swing screening device is too small, the grains will not fall smoothly from the fins

[0005] However, it is difficult to determine whether the increase in grain loss is caused by the above (i) or the above (ii) by the above-mentioned loss sensor, and in order to control the loss to an appropriate target value, as a control One of the means is control to lower the vehicle speed. However, it has the following disadvantages: if the vehicle speed control is performed, the work efficiency will be reduced. In addition, if you want to adjust various controls in the correlation relationship between the loss amount target values, While controlling to reduce the amount of loss, the operator must adjust the control settings for the various control means used for it, which makes the control adjustment correspondingly complicated

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