BLS—700型半链轨是红兴隆机械厂研制生产的。1981年红兴隆管局麦收遇到严重涝灾,连续降雨40余天,雨量达171.9～310.2毫米,土壤含水率达55%以上,积有明水,致使联合收割机无法下地作业。麦收开始,黑龙江省农场总局农机处对各场防陷改装和引进的收割机半链轨装置进行了调查总结 BLS-700 type half-rail is developed and produced by Hongxinglong Machinery Factory. In 1981, the Hongxing Longmail Bureau received serious waterlogging, more than 40 days of continuous rainfall, rainfall reached 171.9 ~ 310.2 mm, the soil moisture content of more than 55%, a plot of clear water, resulting in a combined harvester can not work. At the beginning of wheat harvest, Agricultural Machinery Department of Heilongjiang Provincial Farm Bureau conducted a survey on all the anti-retrofitting installations and the introduction of harvester half-track device