链耙捡拾机构双链传动同步性监测系统的设计*

为实现链耙式残膜回收机作业过程中链耙捡拾机构双链传动同步性的实时监测,设计一种基于电涡流传感器的链耙式残膜回收机双链传动同步性监测系统。该监测系统以STC89C52单片机硬件系统为下位机,通过电涡流传感器和霍尔传感器分别获得链耙捡拾机构与动力轴转速信息,判断收膜机链耙捡拾机构运行状态,并通过HC-12无线模块将状态信息传输至SG121-BGCM型工控机人机界面实时显示。室内试验表明,在收膜链耙转速为168 r/min时,系统对链耙捡拾机构跳齿情况监测准确率为96%以上;田间试验表明,在收膜机前进速度取8 km/h,链耙捡拾机构转速取168 r/min 时,跳齿监测准确率为95%以上。该监测系统实现了对链耙式残膜回收机运行状态的实时高精度监测,有助于提高残膜回收机作业可靠性。

Design of synchronization monitoring system for double chain drive of chain rake picking mechanism

In order to monitor the double chain drive synchronicity of the chain rake picking up mechanism, a double chain drive synchronicity monitoring system based on eddy current sensor was designed. The monitoring system takes STC89C52 MCU hardware system as the lower machine and obtains the speed information of the chain raking mechanism and the power shaft through the eddy current sensor and Hall sensor, respectively. The system determines the running state of the chain raking mechanism of the film receiving machine. It transmits the state information to the human-machine interface of SG121-BGCM industrial computer for real-time display through the HC-12 wireless module.The laboratory test shows that when the speed of the film collecting chain harrow is 168 r/min, the accuracy rate of the jumping gear monitoring of the chain picking mechanism is more than 96%.The field experiment shows that the accuracy rate of the jump gear monitoring is more than 95% when the forward speed of the film collector is 8 km/h, and the speed of the chain harrow picking mechanism is 168 r/min. The monitoring system realizes the real-time and high precision monitoring of the running state of the chain-rake type residual film recovery machine, which is helpful to improve the operation reliability of the residual film recovery machine.