目的 针对机车弹簧组， 对其自动化包装机进行研制。 方法 按照自动化生产工艺流程和产品包装的技术要求， 提出机车弹簧“U”型卧式自动包膜机， 包括供膜机构、供料机构、上推机构、下托机构、下推机构以及输送机构， 能够实现弹簧自动分类、薄膜裹包、套装、装箱等一系列自动化包装过程。 结果 满足自由高度范围为 200~260 mm， 直径范围为 80~120 mm， 弹簧原钢直径范围为 Φ12~Φ32 mm， 内簧与外簧自由高度误差≤2 mm的弹簧组， 以机械方式高速高效地全自动包装的要求。 结论 可降低材料成本，减少人工操作，并达到弹簧防损、防绣包装的效果。

Objective Targeting at locomotive spring production, its packaging production line was designed. Methods According to the technical requirements of the automated production and packaging process for locomotive spring, this paper presented a "U" type horizontal automatic packaging machine for locomotive spring, which was composed of film supplying unit, feeding unit, uppushing unit, holding unit, downpushing unit, and transport unit. Using this system, a series of automated packaging process for locomotive springs were accomplished, including automatic classification, film wrapping, packaging and packing. Results This method satisfied the requirements of high efficient automatic packaging in mechanical way for spring sets with a free height range of 200~260 mm, a Φ range of 80~120 mm, and a spring raw steel diameter range of Φ 12~ Φ 32 mm and an error between the free height of inner and external spring of 2 mm or less. Conclusion It could reduce the cost of materials, reduce the manual operation, and achieve the damage-proof and rust-proof packaging of the locomotive spring.