Abstract: A preload type granulator includes a drive unit, a transmission unit including a transmission sleeve rotatable by the drive unit and having displacement slots cut through the peripheral wall thereof, a first coil spring and a second coil spring with different spring coefficients connected in series and axially mounted in an installation space in the transmission sleeve, and a cutting unit including a connecting shaft fastened to the transmission sleeve by screw bolts respectively inserted through the displacement slots and threaded into the connecting shaft, a cutter holder mounted on the connecting shaft and a plurality of cutting tools mounted on cutter holder. Thus, the spring coefficient adjustment module is used to adjust the spring coefficients of the first coil spring and the second coil spring, so that the preload stroke of the cutting unit is adjusted to control the friction between the cutting tools and the die face.

Abstract: A preload type granulator includes a drive unit, a transmission unit including a transmission sleeve rotatable by the drive unit and having oblong slots cut through the peripheral wall thereof, two elastic modules with different spring coefficients connected in series and axially mounted in the transmission sleeve, and a cutting unit including a connecting shaft abutted with a bottom side thereof against the elastic modules and fastened to the transmission sleeve by screw bolts that are respectively inserted through the oblong slots and threaded into the connecting shaft, a cutter holder mounted on the connecting shaft and a plurality of cutting tools mounted on cutter holder. Thus, the series of elastic modules generates a constant spring pressure to adjust the pressure between the cutting tools and the die face, controlling the friction between the cutting tools and the die face.

Abstract: A cutter blade driving and positioning control structure formed of a rotary drive, a transmission unit, a sliding unit, a linear motor and a cutter unit and used in a plastic pelletizing machine for making plastic pellets is disclosed. The rotary drive provides a rotary driving force for driving the transmission unit to rotate the cutter unit. The linear motor is adapted to reciprocate the transmission unit, moving the cutter unit back and forth rapidly with minimized energy consumption.

Abstract: An extruder filter replacement and backwash structure includes an extruder body having a feed hole and a material outlet respectively located in opposing front and rear sides thereof, a first piston set with a first piston rod, and a second piston set with a second piston rod. Subject to cross connection between the first piston rod and second piston rod and the feed hole and material outlet of the extruder body, the first filter or second filter can be replaced without shutting down the extruder press, or backwashed during operation of the extruder press.

Abstract: A combination cutter and transmission shaft assembly used in a plastic pelletizing machine for cutting off an extruded plastic material from a perforated plate into plastic pellets is disclosed to include a transmission shaft rotatable on and axially movable along the axis thereof, and a cutter unit including a cylindrical cutter holder axially slidably coupled to and rotatable by the transmission shaft, a spring member mounted in the cylindrical cutter holder and stopped between one end of the transmission shaft and an inside wall of the cylindrical cutter holder and a plurality of cutter blades mounted at one end of the cylindrical cutter holder and kept in contact with the perforated plate and rotatable with the cylindrical cutter holder over the perforated plate.

Abstract: A cutter blade driving and positioning control structure formed of a rotary drive, a transmission unit, a sliding unit, a linear motor and a cutter unit and used in a plastic pelletizing machine for making plastic pellets is disclosed. The rotary drive provides a rotary driving force for driving the transmission unit to rotate the cutter unit. The linear motor is adapted to reciprocate the transmission unit, moving the cutter unit back and forth rapidly with minimized energy consumption.

Abstract: A dual speed hub includes a CPU, two hubs of different transmission speeds, two MACs (media access controls), and a switch, wherein the CPU periodically sends a test packet in proper order through one MAC, one hub, the switch and the other hub to the other MAC, then checks the receiving condition and the content of the returned test packet, then determines the normality of the function of the switch subject to the receiving condition and the content of the returned test packet, and then provides a warning signal to a network management system when the switch is judged abnormal, informing the network manager to repair the switch.