Injection structure with encoder-free hollow torque motor

The injection structure comprises a head plate, an injection seat, a charging barrel, an injection oil cylinder and a motor, the injection seat is arranged on one side of the head plate, the charging barrel is located between the head plate and the injection seat, a discharge port of the charging barrel is communicated with an injection hole of the head plate, a screw rod is arranged in the charging barrel, one end of the screw rod is connected with the motor, and the other end of the screw rod is connected with the injection oil cylinder. The motor is fixed to the injection base and can drive the screw to rotate, the injection oil cylinder is used for driving the screw to move in the axial direction of the charging barrel, and a speed measuring electric eye used for measuring the rotating speed of the screw is arranged on the outer side of the motor. The motor is adopted to replace a hydraulic motor in the prior art, due to the fact that the energy consumption of the motor is far lower than that of the hydra