Automatic drain is used to tar storage tank

The utility model relates to an automatic drain is used to tar storage tank, including fixing online densimeter and fluid -discharge tube on the tar storage tank, the fluid -discharge tube is a plurality of, and follow the direction of height and evenly set up on tar storage tank upper portion, online densimeter and fluid -discharge tube one -to -one, and the bottom sensor settings of every online densimeter height alignd with lower the following that corresponds the fluid -discharge tube, establish electrical control valve on the fluid -discharge tube, be connected through PLC controller and online densimeter electricity. Compared with the prior art, the beneficial effects of the utility model are that: 1 )Effectively solved and produced the problem that a large amount of outputs of light component occupied tar storage space because of tar time of repose is long, improved tar storage tank turnover efficiency and effective volume, 2 )The flexible operation is convenient, can change the setting value of automatic density appearance as required, realizes different flowing back demands, 3 )Through PLC realization automatic control, improved workman's operation environment, the operating is simplified flow has reduced the running cost.