由甘肃省机械科学研究院开发研制的４Ｌ１２０型小型联合收割机系麦类作物的田间收获机械。它与天水１３．２８ｋＷ小四轮拖拉机配套，全悬挂全喂入式，一次性完成收割、脱粒、清选等田间作业项目。该机设计合理，作业过程流畅，采用旋轮清选装置，谷粒清洁度高于９８％， Developed by the Gansu Institute of Machinery Science 4L  120 small combine harvester wheat crop field harvesting machinery. It Tianshui  13.28kW small four-wheel tractor matching, full suspension full feeding, one-time completion of harvesting, threshing, cleaning and other field operations. This machine is reasonable in design, smooth operation process, the use of wheel cleaning device, grain cleanliness higher than 98%