The emulsion medium used in coal mines often fails to meet the standard, which affects the use of the chain control system and the chain motor, and greatly reduces the service life of the motor and the control valve, resulting in irreversible damage. Increasing the common filter can solve this problem in a short time, but the common tube filter is easy to be clogged after a few times of use, which leads to the chain system can not work normally, and it is necessary to replace the filter again for normal use, which is a waste of manpower and material resources and reduces work efficiency. This is a waste of labor and material resources and reduces the working efficiency. The emulsion backwash filter developed by Butuo for this situation can be used in backwash mode to flush away the impurities when the filter is clogged, and there is no need for frequent replacement of the filter. This filter is produced with advanced technology from abroad, and the valve body, filter element and other accessories are imported, which can effectively provide clean working medium for the motor and control system.