Arrangement related to a plastic injection moulding aggregate by which plastic and hardener are mixed in a mixing chamber

摘要

In a plastic injection moulding aggregate with a compressed air motor 1 for driving separate pumping devices for plastic and hardener, the pumping device for the hardener comprises two single- acting piston pumps 39a, 39b, working in phase opposition. These pumps are driven during the suction stroke by a dog 41 connected to the piston rod 21 of the compressed air motor, and during the pumping stroke by respective compressed air cylinders 20a, 20b, said cylinders acting in synchronism with the compressed air motor.