Pressure control structure for injection molding

Abstract

The invention discloses a pressure control structure for injection molding. The pressure control structure comprises a screw rod, the screw rod is arranged in a machine barrel, the screw rod is connected with a rotating shaft, the rotating shaft is provided with a rotary disc, one side of the rotary disc is provided with a change wheel, the change wheel is internally provided with a support device, the support device is arranged on a threaded rod, and the two sides of the change wheel are provided with a driving device and a connecting device. By arranging the change wheel, when the screw rod needs to be accelerated, the radius of the change wheel can be increased, the rotating speed of the screw rod driven by the change wheel through the rotary disc can be increased, and the injection molding pressure can be controlled through the rotating speed of the screw rod, so that the production efficiency of injection molding can be improved; and by arranging the threaded rod, a first threaded cylinder and a second threaded cylinder, the first threaded cylinder and the second threaded cylinder can move forwards or backwards on the threaded rod through rotation of the threaded rod, stepless speed changing of the change wheel can be achieved, the rotating speed of the screw rod can be controlled at will through the change wheel, and then the injection molding pressure is controlled.

Description

technical field [0001] The invention relates to the technical field of injection molding devices, in particular to a pressure control structure for injection molding. Background technique [0002] Injection molding machine is also known as injection molding machine or injection machine. It is the main molding equipment for making thermoplastics or thermosetting plastics into various shapes of plastic products using plastic molding molds. Divided into vertical, horizontal, and all-electric types, the injection molding machine can heat the plastic and apply high pressure to the molten plastic to make it inject and fill the mold cavity. [0003] In the injection molding process, the granular or powdery plastic is first added into the barrel, and the plastic is melted by the rotation of the screw and the heating of the outer wall of the barrel, and then the screw injects the molten plastic into the mold cavity, but the current drive motor is driving the screw In the process of...

AI Technical Summary

Problems solved by technology

[0003] In the injection molding process, the granular or powdery plastic is first added into the barrel, and the plastic is melted by the rotation of the screw and the heating of the outer wall of the barrel, and then the screw injects the molten plastic into the mold cavity, but the current drive motor is driving the screw In the process of rotation, the speed of the motor is constant, which leads to a constant speed of the screw, so that the pressure of the injection molten plastic is also constant. It is impossible to control the pressure of the molten plastic by increasing the speed of the screw. It is necessary to control the molten plastic. It is difficult to achieve when pressurizing to make the production speed up, etc.

Images