Comprehensive mechanized longwall mining frame rear filling entry retaining method

The invention discloses a comprehensive mechanized longwall mining frame rear filling entry retaining method which comprises the following steps: step 1, planning a mechanized longwall mining frame rear filling working face on one side of an air return main roadway and a transportation main roadway, and planning the length of the working face and the width of a gate road; secondly, an air return crossheading is tunneled in one side of the working face; thirdly, a coal mining machine, a scraper conveyor and a paste filling hydraulic support are adopted for mining the working face coal seam, and the roadway to be reserved is mined synchronously; fourthly, a filling pipeline is arranged in a reserved air return crossheading on the right side of the mined working face; fifthly, the paste filling hydraulic supports, the isolation supports and the prefabricated blocks are adopted to isolate the goaf formed behind the supports; and sixthly, filling slurry is connected into the filling operation area through a fillin