For more than 30 years, he devoted himself to the design, development and research of rubber machinery products such as internal mixer, flat-panel curing press and double-cone twin-screw extruder. As chief engineer of Yiyang Rubber Machinery, Jin Jinyao, as the general manager of the project, presided over the development of GK-400N and GK250E inner mixer.
GK-400N type mixer was awarded "the second prize of science and technology progress of Hunan province" and "the ninth Five-Year plan national technological innovation and excellent product award", etc. GK250E type mixer won the "second prize of science and technology progress of Hunan province" and "national key and new product award".
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