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Observe the damaged gear of the reducer, most of the gear teeth have large or small pits at the proximal end on the same side of the force surface, and no pits are found from the middle part of the gear teeth to the other end, indicating that the two gear shafts are being assembled. There is a parallelism error between them, so that the gear teeth are not uniformly stressed across the entire tooth width, and the phenomenon of "one end contact" appears, so there is stress concentration in some areas.
The reduction box is connected with the melting pump of the extruder, and the function is to pressurize the molten resin. It is a low-speed and heavy-duty reduction box. Since the medium of the melting pump is a variety of resins of different grades, the melting fingers of the resins are quite different, resulting in a large change in the transmission torque of the reducer. In 2003, the extruder was also expanded and transformed, and the production capacity of the whole machine was expanded from 13.3 t/h to 15.5 t/h, but this equipment was not modified. The manufacturer made the equipment at full load or even overloaded operation. The above factors All tend to cause fatigue cracks in the gear.