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合肥市老厂改造的第一条空心砖生产线1990年10月1日在合肥建材一厂投产,生产出合格的高空洞率的承重和非承重空心砖。这条生产线的改造是在原人工干燥生产线上进行的,除搅拌机和450挤砖机外,全部采用原有设备,在原工艺线上只增设了三台主要设备,即高效双轴搅拌挤出机,高速耐磨细碎对辊机和双级真空挤出机。在人工干燥工艺上改负压集中排潮为正压分散分段排潮新工艺,节省18号风机一台,年节约电力336000千瓦·
The first hollow brick production line reconstructed by the old factory in Hefei was put into production on October 1, 1990 at Hefei Building Materials No. 1 Plant, producing qualified hollow-heavy bearing and non-load-bearing hollow bricks. The transformation of this production line was carried out on the original artificial drying production line. Except for the mixer and the 450 extruding machine, all the original equipment was used. Only three main equipments were added on the original process line, namely the high-efficiency biaxial mixing extruder. High-speed wear resistant crusher and dual-stage vacuum extruder. In the artificial drying process, the negative pressure concentrated tide was changed to a new process of positive pressure dispersion and partial discharge of tides, which saved one No. 18 fan and saved 336,000 kilowatts of electricity annually.