The invention relates to a main gearbox
assembly of a single-screw extruder and application of the main gearbox
assembly. The main gearbox
assembly comprises a main gearbox and a thrust screw, wherein the main gearbox is a hollow output shaft, an internal spline is arranged at the
tail end of the main gearbox, and two locating holes are formed in the
tail end at the same time; a thrust spiral is arranged at the front part of the thrust screw, a locating neck is arranged at the rear part, an external spline and bulged shaft necks are arranged on the locating neck, the diameters of the bulged shaft necks are larger than that of the thrust spiral, and smaller than that of the external spline at the
tail end; the hollow output shaft is equipped with an adjusting pad and a rear pressing cover on the surface of the tail end, and equipped with an external gear sleeve at the front end, the external gear sleeve is provided with an internal hole, and the
diameter of the internal hole in the external gear sleeve is larger than that of the thrust spiral; after the thrust spiral at the front end of the thrust screw penetrates the inner hole in the external gear sleeve, the bulged shaft necks are placed in the locating holes of the hollow output shaft, and the external spline is engaged with the internal spline; a rotation joint penetrates the rear pressing cover and the adjusting pad, and is connected with the thrust screw and communicated with a circulating
water channel in the thrust screw. During use, a rubber extruding unit is equipped with at least one material conveyor containing the gearbox assembly of the single-screw extruder.