The coal mine goaf filling material is a low viscosity, two-component, polymer composite material. After the two-component material is fully mixed and grouted with a professional grouting pump, it reacts quickly and expands rapidly, and then solidifies and forms. It is used to fill abandoned old caves, slip holes (coal bunkers), fill the roof of the roadway on the working face, and perform eye-cut grouting on the loose rock coal seam at the top of the roadway to prevent roof fall. Strengthen the mining face of the roadway. To prevent gas leakage and ensure safe construction of workers, gas leakage can be prevented by drilling holes to fill adjacent abandoned roadways and blocked waste roadways and other mined-out areas.

     Due to pipe sealing problems and a small amount of backflow of formation water, a small amount of catalyst and water often penetrate into the foaming resin pipe entering the special pump. Because water also has a strong catalytic effect on the foaming resin, the viscosity of the resin will increase and even foam ahead of time before mixing Affect the filling effect and even cause equipment damage.

     The on-line viscosity sensor produced by our company is installed in the foamed resin pipeline to monitor the viscosity change of foamed resin in real time, so as to judge whether the foamed resin is mixed with catalyst and water, ensure the filling quality and prevent major accidents such as pipeline equipment blockage.