Chopping machine assembly for harvester

A chopping machine assembly for a harvester comprises a chopping machine assembly body, the chopping machine assembly body is an irregular-shaped steel plate, an inner bearing and an outer bearing are fixedly connected to the middle of the chopping machine assembly body, the inner bearing and the outer bearing are rotatably and movably connected with a connecting rod shaft, and a shaft head of the connecting rod shaft is provided with a protective cover. The protective cover is fixed on the chopper assembly body through a bolt, a profiling groove is formed in the surface of the chopper assembly body, an oil seal pad is arranged between the protective cover and the chopper assembly body, a cavity is formed between the protective cover and the chopper assembly body, lubricating oil is arranged in the cavity, and the profiling groove is of a U-shaped structure. The profiling groove is of a circular structure with the connecting rod shaft as the circle center, by arranging the profiling groove in the surface of t