气力输送铸造型砂(包括坭芯砂)于一九六六年八月份完成了第二阶段的试验以后,初步地摸到了设备的结构特点及一般规律。但当时由于局限于试验条件,个别部件仍存有不足之处,有些技术参数,还需要通过一定时间的生产验证。我们遵循毛主席关于“在生产斗争和科学实验范围内,人类总是不断发展的,自然界也总是不断发展的, Pneumatic conveying of foundry sand (including sand core) After the completion of the second phase of the test in August 1966, the structural features and general rules of the equipment were initially touched. However, due to the limited test conditions, there are still some shortcomings of individual components, some technical parameters, but also need to pass a certain period of production verification. We follow Chairman Mao’s remark that "mankind always develops continuously within the scope of the struggle for production and science. Nature is always developing continuously.