Efficient injection device of injection molding machine

An efficient injection device of an injection molding machine comprises a cylinder, a non-return valve, a screw, a hopper and a motor, wherein the cylinder comprises a heating cylinder body, an injection nozzle and a cylinder cover, the heating cylinder body is arranged in an inner cavity of the cylinder, an inner cylinder is arranged on the inner side of the heating cylinder body, an inner thread is arranged on the inner wall of the inner cylinder, the injection nozzle is arranged at the front end of the cylinder, the non-return valve is arranged at one end, which is close to the injection nozzle, in the cylinder, the cylinder cover is arranged at the back end of the cylinder, one end of the screw penetrates through the cylinder cover to be inserted in the cylinder from the back end of the cylinder, one end of the screw is connected with the inner cylinder provided with the inner thread in a screw-thread fit manner, the other end of the screw is connected with an output shaft of the motor, a U-shaped fixing platform is arranged at the upper end of the cylinder, a rectangular groove is formed in the side wall of the fixing platform, a hopper seat is glidingly connected in the rectangular groove, and the hopper seat is communicated with the hopper. With the adoption of the efficient injection device, materials are changed quickly and conveniently, blockage of the bottom of the hopper is avoided, and the quality of injection-molded products is improved.