SZ series gearbox is special machanical transmission device for conical twin screw extruder. The transmission box adapts the standard design of JB1790050.1-1999, Its parts of gear and shafts are made of high strength alloy steel. The gear is made through verious process thchnologies such as carburing, quenching, teeth grinding, etc, The accruacy of gear is the sixth grade.


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