Grouting device for filling primary gangue in coal mine

The grouting device comprises a grouting pump main body, the front portion and the rear portion of the lower end of the grouting pump main body are fixedly connected with bottom frames, sliding grooves are formed in the inner walls of the two sides of the front portion and the rear portion of each bottom frame, the two sides of the lower ends of the two bottom frames are fixedly connected with hanging plates, and moving mechanisms are installed on the two hanging plates. The two bottom frames are symmetrically provided with two moving mechanisms, each moving mechanism comprises a moving wheel, the moving wheels are located on the outer sides of the bottom frames on the same side, the middles of the moving wheels penetrate through and are rotationally connected with fixing pipes, and the ends, close to the bottom frames on the same side, of the fixing pipes are fixedly connected with sliding blocks. The threaded supporting rod of the moving mechanism is in threaded connection with the hanging plate, the thread