路桥公司于１９９７年从沈阳路达公司购进一套ＬＱＢ１２００沥青搅拌站。该套设备的加热滚筒是通过链轮驱动的，由于加热滚筒负荷大、温度高（链轮处温度为１６０℃左右）且距除尘器较近，环境特别恶劣，故链条每年都要更换，链轮也很快磨损。因链条为非标准的重载弯板滚子链 Luqiao Company purchased a set of LQB1200 asphalt mixing plant from Shenyang Lunda Company in 1997. The heating roller of the device is driven by the sprocket. Due to the heavy load of the heating roller and the high temperature (the temperature of the sprocket is about 160 ° C.) and the distance is close to the dust remover, the environment is particularly harsh, so the chain is replaced every year. The wheels also wear out quickly. Due to the chain of non-standard heavy-duty curved roller chain