２００１年６月２日，中共中央政治局委员、中国社会科学院院长李铁映在山东省、威海市领导的陪同下视察了三角集团，乘车间小型环保游览车，参观了三角集团子午胎一车间先进的生产线。游览车行至四鼓成型机旁，当大家从丁玉华同志的介绍中得知这种设备在全世界也只有６台时， On June 2, 2001, Li Tieying, member of the Political Bureau of the CPC Central Committee and president of the Chinese Academy of Social Sciences, accompanied by the leaders of Shandong Province and Weihai City, inspected the Triangle Group, toured the mini-environmental tour bus and visited the workshop of the Triangle Group radial tire Advanced production line. The tour bus went to the side of the drum formation machine. When everyone learned from the introduction of Comrade Ding Yuhua that there were only six such devices in the world,