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在批林批孔运动的推动下,1973年12月至1974年3月,由北京矿冶研究院、承德矿山机械厂、北京有色冶金设计院、杨家杖子矿务局和南京凤凰山铁矿等单位组成试验组,在南京凤凰山铁矿,采用700×900毫米双列四室侧动外隔膜式矩形跳汰机,对我矿12～2毫米的贫赤铁矿进行了工业性试验。其各项技术指标达到或超过梯形跳汰机的指标,台时处理能力达25吨以上,比梯形跳汰机构造简单,维护检修容易,配置灵活。它既可以单机使用,又能双机
Pok Pok Kong campaign to promote the hole, from December 1973 to March 1974 by the Beijing Mining and Metallurgy Research Institute, Chengde Mining Machinery Plant, Beijing Nonferrous Metallurgy Design Institute, Yangzhang Zizi Mining Bureau and the Nanjing Fenghuangshan Iron Mine And other units to form a test group. At the Fenghuangshan Iron Mine in Nanjing, an industrial test was conducted on a 12 - 2 mm lean hematite mine in our mine using a 700 × 900 mm double row four compartment side moving outer membrane rectangular jig. Its various technical indicators meet or exceed the trapezoidal jig indicators, processing capacity of more than 25 tons Taiwan, trapezoidal jig than the simple structure, easy maintenance and configuration, flexible configuration. It can stand-alone use, but also double machine