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Zhongneng Jinqi Energy-saving Materials Co., Ltd. planned to purchase a large-caliber (?1054-?1930) vacuum sizing production line in July 2018. They visited many companies in Qingdao to conduct field inspections, and finally produced a large-caliber production line for our company. Strong interest, exchanged some technical issues at the scene, the customer asked whether the tractor can be combined because of its loading and unloading reasons. At that time, we responded to the customer. We have mature experience in the combined structure. Many customers in the past I also requested this structure, and made a detailed statement to the customer about some of the combined technical concepts and key points. The customer then reached a cooperation agreement with our company. We also lived up to the customer's trust and delivered the paper perfectly during the delivery period.