The driving device is equipped with a small gear at the output shaft end of the pendulum pin wheel reducer, worm gear reducer, or gear reducer, and then transmitted to the three--four-stage reduction transmission device of the rotary support transmission. The upper part of the main shaft has forms such as non-lifting, manual lifting, and manual-electric dual-purpose lifting, with a lifting height of 300 mm; an overload torque automatic protection device can be added according to user requirements to ensure the safe operation of the entire equipment. The single-row ball-type rotary support adopts an advanced four-point contact ball structure, capable of bearing large axial forces, radial forces, and overturning moments; this reducer mainly features a large transmission ratio, high transmission torque, compact structure, low noise, smooth operation, and no leakage. It is specifically suitable for supporting products in sewage equipment such as mud scraper machinery with high load factors, like those in steel plants.