Calibration test stand for performances of grain loss monitoring sensor of combined harvester

Abstract

The invention relates to a calibration test stand for performances of a grain loss monitoring sensor of a combined harvester, and belongs to the field of calibration test stand design for grain loss monitoring sensors of combined harvesters. The test stand consists of two function parts, one part comprises a feeding device, a lifting platform, a fixing bracket, a stepping motor, a screw, a screw nut, a linear guide rail and sliding blocks, and is used for controlling grain dropping density, grain dropping speed and a grain droppoint position on the surface of the grain loss monitoring sensor; the other part comprises a first platform, a first supporting base, first connecting rods, a second platform, a direct current motor, a stepped shaft sleeve, a second connecting rod, a third connecting rod, springs, spring limiting pins, a third platform, an electromagnet stator, an electromagnet rotor, second supporting bases, a rotating shaft, and a grain loss monitoring sensor mounting platform, and is used for simulating reciprocating motion and vibration of the tail part of a vibrating screen; and calibration for the performances of the grain loss monitoring sensor is accomplished jointly under matching of the two parts.

Description

technical field [0001] The invention belongs to the design field of a calibration test bench for a grain loss monitoring sensor of a combine harvester, in particular to a performance calibration test bench for a grain loss monitoring sensor of a combine harvester. Background technique [0002] At present, the cleaning device of the combine harvester mainly adopts a wind screen structure form composed of a fan and a vibrating cleaning screen. The cleaning loss rate is the main performance index to measure the performance of the combine harvester. With the continuous improvement of the intelligence of the domestic combine harvester, domestic scholars have begun to study the grain loss monitoring sensor. The performance stability of the grain loss monitoring sensor is directly related to the monitoring accuracy, so it is necessary to perform performance calibration on the developed grain loss monitoring sensor. The calibrating device for the grain loss monitoring sensor report...

AI Technical Summary

Problems solved by technology

The calibrating device for the grain loss monitoring sensor reported in the relevant literature is too crude, and only statically calibrates the grain loss monitoring sensor, that is, the grain loss monitoring sensor remains stationary, and the process of grain falling is simulated by a micro-electromagnetic feeder, and the vibration is adjusted by adjusting the excitation of the vibrator. The electric current makes the grain fall at a certain speed and hit the grain loss monitoring sensor

The existing problems are mainly: the calibration equipment cannot truly simulate the environment where the sensor for monitoring the grain loss is installed; the electromagnetic vibrating feeder makes the falling point of the grain on the surface of the sensor relatively concentrated

Since the grain loss monitoring sensor is installed at the tail of the vibrating cleaning sieve, the operating environment is relatively complicated and there is vibration interference. The detection speed of the grain loss monitoring sensor developed at this stage can reach 500-800 grains per second. The grain loss reported in the literature Monitoring sensor performance calibration method can not effectively determine the performance of grain loss monitoring sensor

Therefore, a real-time monitoring sensor performance calibration test bed with good performance has become an urgent problem to be solved. So far, there has been no report on a mature sensor performance calibration device for grain loss monitoring in my country.

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