We are expert plastic and rubber extruder gearbox manufacturer with more than 40 years experience engineer in china.We produce

ZLYJ112/ ZLYJ133/ ZLYJ146/ ZLYJ173/ ZLYJ180/ ZLYJ200/ ZLYJ225/ ZLYJ250/ ZLYJ280/ ZLYJ315/ ZLYJ330/ ZLYJ375/ ZLYJ420 gearbox for plastic single-screw extruder machine; SZ conical gearbox for pvc twin screw extruder machine.

1)ZLYJ gearbox of 112-146 is Natural cooling, 173-250 is Coil cooling, 225-250 is Cooler Cooling with pump. the material of cooling tube is pure bronze.
2) The whole gear material is cast iron, Gear material: high alloy steel low carbon (20CrMnTi), surface is carburized case upto 0.7-1.1mm,surface hardness is HRC58-64, accuracy of gear is GB10095-88-5 standarded. gear craft is (gear grinding)
3) Our bearing is Tapered Roller Bearings( China top brand ZWZ thrust bearing)
4) There are several normal ratio: 8,10,12.5,16,20, depends on customers requirements.
5) Various seal form and perfect oil leak-proof function.( Taiwan NAK brand gearbox oil seal)