我厂是轻工部农膜生产定点厂之一。宽幅薄膜生产设备是我厂关键设备,担负着全部农膜产量的70％。该设备是我厂于1976～1980年自行研制的,当时处于较先进的水平。几年来,由于国内外吹膜设备的发展和市场竞争的需要,我厂宽膜设备已显得落后,主要表现为:现用的莲花瓣机头结合线多,造成工艺难控制,薄膜易撕裂,正品率低,产品外观不理想;由于现有的挤出机长径比小,螺杆结构落后,造成挤出量低,塑化质量不好,影响生产的发展。为此,从1987年开始,我厂先后对5台宽膜机组结合大修进行技术改造。如对1~＃ 、3~＃、4~＃机更换新主机,以上海产长径比25:1挤出机代替20:1挤出机,单机产量由200kg/h提高到300kg/h。1992年又更换了2~＃主机,以驻马店产主机替代大连主机,较上海主机又先进一步,其波状螺杆为国内最新研制的大直径螺杆,单机产量由200kg/h提高到350kg/h,改造后全年可增加产量4400吨,增加利润200万元。我们还采用目前国 Our factory is one of the appointed factories for agricultural film production in the Ministry of Light Industry. Wide-film production equipment is the key equipment of our plant, and it is responsible for 70% of the total agricultural film production. The equipment was developed by our factory from 1976 to 1980 and it was at a more advanced level at that time. Over the past few years, due to the development of film blowing equipment at home and abroad and the need of market competition, our wide-film equipment has appeared to be lagging behind. The main performance is that: the current combination of lotus valve heads is more, resulting in difficult process control, the film is easy to tear The product quality is low, and the appearance of the product is not ideal; due to the small ratio of length to diameter of the existing extruder, the screw structure is behind, resulting in low extrusion volume and poor plasticizing quality, which affects the development of production. For this reason, since 1987, our factory has successively carried out technological transformation on the combination of 5 sets of wide-film unit overhaul. If new machines are replaced for 1~#, 3~#, and 4~# machines, instead of a 20:1 extruder, a 25:1 extruder with a long-to-diameter ratio in Shanghai, the stand-alone output will increase from 200kg/h to 300kg/h. In 1992, it replaced the 2~# host and replaced the Dalian host with the Zhumadian production host. It was further advanced than the Shanghai host. Its corrugated screw was the newly developed large-diameter screw in the country. The stand-alone output increased from 200kg/h to 350kg/h. After the end of the year, it could increase output by 4,400 tons and increase profits by 2 million yuan. We also use the current country