CAJ | 학술논문

为了给联合收割机行走半轴载荷谱的编制提供真实全面的载荷—时间历程,需要准确获取联合收割机行走半轴在典型作业工况下的载荷信号.该文在分析联合收割机工况特点和行走底盘结构特点的基础上,基于无线传感测试技术,通过选用合理的扭矩、转速传感器和数据采集系统,构建了一种联合收割机行走半轴扭矩和转速无线测试系统,并以沃得巨龙280型履带式联合收割机为样机搭载该系统,并进行了载荷测试性能试验,分析了该样机行走半轴在不同路面起步、直行、转弯时的扭矩和转速,确定了载荷测试性能的稳定性和可靠性.试验结果表明,该载荷测试系统方案合理、技术可行,所获数据稳定可靠.
위료급연합수할궤행주반축재하보적편제제공진실전면적재하—시간역정,수요준학획취연합수할궤행주반축재전형작업공황하적재하신호.해문재분석연합수할궤공황특점화행주저반결구특점적기출상,기우무선전감측시기술,통과선용합리적뉴구、전속전감기화수거채집계통,구건료일충연합수할궤행주반축뉴구화전속무선측시계통,병이옥득거룡280형리대식연합수할궤위양궤탑재해계통,병진행료재하측시성능시험,분석료해양궤행주반축재불동로면기보、직행、전만시적뉴구화전속,학정료재하측시성능적은정성화가고성.시험결과표명,해재하측시계통방안합리、기술가행,소획수거은정가고.
Half axle is an important part of a walking system in a combine harvester;the damage from half axle is generally fatigue failure, which has a direct effect on the reliability and stability of the combine harvester. Minority combine harvester manufacturers have half axle fatigue test rigs, and most of the loads on the fatigue test rig are set artificially, thus it cannot accurately predict fatigue life of half axle in absence of comprehensive consideration of various alternating loads. Fatigue life analysis and fast in doors simulation of the load fatigue test on the basis of load spectrum can provide the basis for the improvement of half axle. Improvement of fatigue performance of half axle is conducive to the competitiveness of the products on the market at home and abroad. It is not a suitable solution to use traditional shaft or disc torque sensors to test the torque of half axle, because the half axle is closed in the transmission. Operating environments of combine harvesters are complex, and half axles often bear a complex alternating load which puts forward higher requirements on the stability and reliability of the performance of the load test system. To provide a precise and comprehensive load-time course for the compiling of load spectrum of the half axle of a combine harvester, the complex and alternating load signal in typical working conditions must be acquired accurately. Based on an analysis of working characteristics and the construction features of chassis of combine harvesters, a wireless load test system was put forward in this paper by choosing reasonable torque and rotation speed sensors and data acquisition systems composed of hall sensors, rotation speed signal acquisition modules, resistance strain gauges, power modules, torque signal acquisition modules, wireless routers, computers, and software for signals test and analysis. In order to exclude the influence of measured value of torque signals by bending moment, axial force, and temperature, a reasonable arrangement of resistance strain gauges was designed. The load test system does not need to transform the structure of the gearbox and it is easy to install. The structure of half axle is redesigned so torque acquisition module terminals can be connected to the leads of resistance strain gauges. Mounting brackets of double modules and positive&negative hall sensors were manufactured to set up torque signal acquisition modules and hall sensors. In this system, wireless Wi-Fi communication technology was used to transmit the load signal of the torque and rotation speed of the half axle wirelessly. In order to test the performance of the wireless load test system and acquire the load signal of the torque and rotation speed of the half axle precisely in typical working conditions, the Julong 280 type tracked combine harvester was chosen as the experimental prototype to do load testing experiments in the field with the wireless load test system, after debugging the system in the laboratory. It showed that the data acquired is reliable and the performance of the wireless load test system is reasonable and feasible after processing and analyzing the torque and rotation speed signal of half axle.