Static pressure heavy load direct drive high precision rotary table

Abstract

A static pressure heavy-load direct-drive high-accuracy rotating table comprises a rotating platform composed of a base (1), a pressing board (2), a main guide rail static pressure oil cavity (3), a static pressure core shaft oil cavity (4), a work table top (5), a static pressure oil return system (6), a torque motor stator (7), a stator fixing support (8), a reading head (9), a steel belt type optical grating installation support (10), a rotor installation support (11), a torque motor rotor (12), an oil collection pot (13), a water cooling system (14), a gear distributor (15), a multi-head pump (16), a main guide rail oil cavity (17), a pressing board oil cavity (18), a core shaft pump station system (19), a guide rail pump station system (20), an oil supply system and an oil return system. The static pressure heavy-load direct-drive high-accuracy rotating table is directly driven by the large-torque motor rotor, achieves zero transmission, and is compact in structure and reliable in work; a very low frictional coefficient characteristic of a hydrostatic guide rail is combined, and the rotating table is high in servo rigidity, high in dynamic response speed and small in static difference.

Description

technical field [0001] The invention belongs to the field of mechanical processing, and relates to a numerical control equipment driving device, in particular to a static pressure heavy-duty direct-drive high-precision rotary workbench. Background technique [0002] The traditional CNC rotary table transmission system usually has mechanisms such as rat tooth plate, double gear, single worm gear and double worm gear. The rattooth turntable has high positioning accuracy, but it is limited to limited indexing function, which cannot meet the requirements of CNC linkage interpolation processing. The double-gear driven turntable can obtain high positioning accuracy, but its transmission chain is long, the backlash elimination algorithm is complex, and the servo rigidity is poor, so it cannot be used for high-precision CNC linkage machining. The single worm gear driven turntable uses the double-lead worm to eliminate part of the transmission gap, has certain positioning accuracy a...

AI Technical Summary

Problems solved by technology

However, the existing direct-drive turntable usually uses an integral rotary encoder concentrically installed on the rotary axis of the turntable, and the center hole of the turntable is either a small through hole or a blind hole, which cannot meet the working conditions that large-sized workpieces need to pass through the middle hole of the turntable

At the same time, the existing turntable usually adopts turntable bearings, which have small load and large start-up damping, which reduces the dynamic response characteristics of the turntable

Images