Abstract: To solve the problems of low degree of straw collection and transportation in the traditional highland barley harvesting operation in the northern Tibetan area, as well as poor walking stability of existing harvesters, a matching straw baling device was designed for highland barley combine harvester. The whole machine was mainly composed of feeding mechanism, compression mechanism and knotter clutch device. Through the selection design of the key components of the prototype, the configuration mode and power distribution of each devices of baling machine were determined. Finite simulation of the vibration characteristics of the whole frame was realized by applying ABAQUS software. To avoid resonance during working, the structure was improved and parameters of rack were optimized by comparing trends in natural frequencies with external excitation frequencies. The motion trail of upper fork and lateral fork of feeding mechanism was obtained by using ADAMS software, which determined structure parameters of two forks to avoid interference during operation. The field test results showed that the straw strapping rate reached 98.3%. The straw bale pass rate reached 94.7%. The straw bale resistance rate exceeded 90%. The efficiency of the whole machine reached 0.7 hm²·h^-1. The average straw bale cross-section size was 0.5 m×0.6 m, and the average straw bale density reached 124 kg·m^-3. The performance indicators reached the design requirements. This study provided application examples and technical basis for the design and development of integrated work tools for the joint harvesting of highland barley straw and the balling of straw.

Key words: highland barley straw, combine harvester, straw baling device