PLC控制回字形烘干筒的丸粒化种子烘干装置研发

针对转筒式热风种子烘干装置占地大、能耗高的问题，设计开发了双筒PLC控制的烘干装置。该装置包括内外筒、拖轮、伺服电机、减速器、联轴器、齿轮、齿圈和支架等。烘干筒设计为回字形内外双筒，种子在内外筒往返运动，缩短整机长度、减少热损失。依据动力估算确定小齿轮和大齿轮参数，配置公称转矩250 N·m的SL90型十字滑块联轴器。基于西门子S7-200型PLC开发控制系统。选用安川SGM7J-08A型伺服电机控制机械部件转动，额定输出功率0.75 kW。PLC与伺服电机通讯对应0～10 V与0～32 000的数模转换，以上位指令驱动伺服电机运行。对装置开展试验测试，最大转速50 r/min、烘干温度50～60 ℃、功率0.55 kW。烘干丸粒化番茄种子效率10 kg/h，经60 min烘干，含水率降低10%。所研制的丸粒化种子烘干装置可实现转速智能控制，整机长度较单筒式减少40%，可减少热损失、提高热利用率。 

Development of PLC Controlled Pelletized Seeds Hollow Square Drying Device

Aiming at problems of large area and high energy consumption of rotary hot air seed drying device，a double barrel PLC controlled drying device was designed and developed.The device included inner and outer cylinders，tugs，servo motors，reducers，couplings，gears，ring gears and brackets.Drying cylinder was designed as a double cylinder inside and outside，and the seeds moved back and forth in inner and outer cylinders to shorten length of whole machine and reduce heat loss.According to dynamic estimation，parameters of pinion and large gear were determined，and SL90 type cross slide coupling with nominal torque of 250 N·m was configured.Control system was developed based on Siemens S7-200 PLC.The motor of type of Anchuan SGM7J-08A was selected to control rotation of mechanical components，with rated output power of 0.75 kW.Communication between PLC and servo motor corresponded to digital to analog conversion of 0~10V and 0~32000，and servo motor was driven by upper command.Experimental tests showed that maximum speed was 50 r/min，drying temperature was 50 ~ 60 ℃，and the power was 0.55 kW.Drying efficiency of pelleted tomato seeds was 10 kg/h，after 60 min drying，moisture content was reduced by 10%.The developed pelleting seed drying device could realize intelligent control of rotation speed，and length of whole machine was 40% less than that of single cylinder type，which could reduce heat loss and improve heat utilization rate.