Develop large-scale scrap car compaction (flattening) machine, scrap steel crushing production line, material recovery and treatment equipment, with international advanced level; waste gas recovery and performance adjustment in the process of synthetic leather production; PVC plasticizer free soft waterproof membrane production technology. Main technical parameters: in heavy machinery processing, it is very difficult to measure large size. Can there be a practical measuring tool or measuring method which can be measured by one or two people with an accuracy of 0.05 mm. The main technical parameters can be achieved as follows: 1. Increase the output; 2. Solve the problem of superfine grinding of viscosity, micro perforated plate muffler oil, fiber and ductile materials at room temperature. Main technical parameters: low composition and non-metallic inclusions meet the asmesa-213 standard, strictly control the content of as, Sn, Sb, Pb, Bi five categories of residual harmful elements, as + Sn + sb + bi ≤ 0.04%; perfect process parameters, stable quality, meet user requirements.