Swivel table driving device with double worm and gear backlash mechanisms

Abstract

The invention relates to a swivel table driving device with double worm and gear backlash mechanisms, which comprises a box body and a gear ring which is connected with the swivel table, wherein the box body is provided with two worm and gear transmission mechanisms; the transmission mechanisms are connected between a gear and a motor; a worm is connected with gearwheels coaxial with the worm; the gearwheels are meshed with the gear ring; the axial worm centerlines in both worm and gear transmission mechanisms are in the same straight line; gaps are reserved between adjacent ends of two gears; outer sides of the two ends are sleeved with middle sheaths which can axially move relatively to the gears; and a regulating pad for regulating the axial position of the worms is arranged between a bearing seat for supporting the gears and the box body. The swivel table driving device ensures that the gear ring eliminates a reversal transmission gap during forward-reverse conversion, and has smooth transition. The swivel table has high swivel positioning precision, high repeated positioning precision, low manufacturing cost and low operation cost.

Description

Technical field [0001] The invention relates to a driving device, in particular to a rotary table driving device with a double worm gear anti-backlash mechanism for a horizontal machining center. Background technique [0002] The rotary table is the key functional component of the horizontal machining center. While realizing the linear motion of the machine tool, it provides the fourth linkage axis for the horizontal machining center to complete the rotary indexing and continuous rotary processing, and realize the interpolation processing of complex curved surfaces. Motion positioning accuracy and repeat positioning accuracy are important indicators to measure the technical level of horizontal machining centers. [0003] At present, the rotary table of the horizontal machining center at home and abroad realizes the rotary motion by worm gear transmission and gear transmission two-stage speed reduction or belt transmission, worm gear transmission and gear transmission three-stage sp...

AI Technical Summary

Problems solved by technology

[0003] At present, the rotary motion of the rotary table of horizontal machining centers at home and abroad is realized by two-stage deceleration of worm gear transmission plus gear transmission or three-stage deceleration of belt drive, worm gear transmission and gear transmission. These two transmission methods have inconsistencies. The avoided reverse transmission gap directly affects the rotary positioning accuracy and repeat positioning accuracy of the rotary table, thus affecting the machining accuracy of the machine tool

[0004] In order to avoid the transmission gap caused by the worm gear and gear transmission, some use the torque motor direct drive technology to realize the rotary indexing of the turntable, because there is no intermediate transmission link, and combined with the application of the circular grating, the positioning accuracy and repeat positioning accuracy of this driving device High, but the price of the torque motor itself is relatively high, and the power required for direct drive is higher than that of ordinary servo motors. Using this mechanism will directly increase the manufacturing cost and operating cost of the machine tool

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