Grain loss monitoring sensor with array buoyant raft structure

Abstract

The invention relates to a grain loss monitoring sensor with an array buoyant raft structure, and belongs to the technical field of grain loss measurement of combine harvesters. The grain loss monitoring sensor is mainly used for monitoring entrainment and cleaning loss during harvest of grains such as wheat, paddy, rapes and the like by a combine harvester. In the grain loss monitoring sensor, two layers of thin plates which are riveted are used as a machine frame; a sensitive element is bonded on the reverse side of an upper panel to form a unit; a plurality of monitoring units are arrangedon a floating support plate in parallel; a vibration damping sheet is arranged between each unit and the floating support plate and between the floating support plate and a sensor base; an independent signal modulation circuit is designed in each monitoring unit; and lost grains are identified from other impurities by the signal modulation circuits and output standard square-wave voltage signals,and the square-wave voltage signals are acquired in real time by a secondary meter to obtain the number of the grains lost within a monitoring area of the sensor. The grain loss monitoring sensor is high in monitoring accuracy, high in frequency and small in interference of vibration, and can be applied to real-time monitoring of the entrainment and cleaning loss of the combine harvester.

Description

technical field [0001] The invention belongs to the technical field of grain loss measurement of combine harvesters, and in particular relates to a grain loss monitoring sensor with an array floating raft structure. Background technique [0002] When the combine harvester works in the field, it will inevitably produce grain loss. The main forms are cleaning loss and entrainment loss. The loss is the main performance index to measure the performance of the combine harvester, and it is also an important basis for the adjustment of the working parameters of the combine harvester. In recent years, the real-time monitoring technology of grain loss has become an important research topic for the intelligent development of combine harvesters. The main method is to install sensors at the tail of the combine harvester cleaning sieve and under the separation concave plate. The proportional relationship between the amount and the actual grain loss is calculated to obtain the actual grai...

AI Technical Summary

Problems solved by technology

Using piezoelectric sensitive materials to measure grain impact signals is the main working principle of existing grain monitoring sensors. Although some achievements have been made, the overall technology is not perfect, mainly in the vibration of combine harvesters during harvesting. The quality of agricultural grain is relatively small, the lost grain is usually mixed with other residues (mainly short stalks and chaff), and the impact signal is relatively weak. These factors will have a significant impact on the output signal of the piezoelectric material. Therefore, how to effectively extract grain impact signals from vibration interference and improve measurement accuracy and response speed has become a key link in sensor design

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