Device used for vertical lathe and used for pre-tightening main shaft bearing through round nut

Abstract

The invention discloses a device used for a vertical lathe and used for pre-tightening a main shaft bearing through a round nut. The device comprises a main motor, fixed cylindrical cavities, rotating cylindrical cavities, cylindrical hollow hydraulic cylinders, rotating pull rods and a clamping device. The positioning and pre-tightening device used for the vertical lathe and used for pre-tightening the main shaft bearing through the round nut is a cylindrical device. The main motor is connected with a drive shaft to drive driven shafts to rotate. The driven shafts are pre-tightened with the rotating cylindrical cavities through large plane bearings and rotate relative to the fixed cylindrical cavities. The rotating pull rods are arranged in the fixed cylindrical cavities. The rotating pull rods exert pressure on the hydraulic hollow hydraulic cylinders through large hydraulic cylinders and control the rotating pull rods to axially move with a disc-shaped spring set. The rotating pull rods drive the clamping device to axially move through pin sets. The rotating cylindrical cavities drive the clamping device to rotate in the radial direction under meshing of upper meshing teeth and lower meshing teeth. The round nut to be pre-tightened can be driven to be screwed in under radial rotation of the clamping device in the radial direction of a main shaft to be pre-tightened. The rotating speed and the rotating angle of the main motor are controlled so that the stroke of the round nut to be pre-tightened can be controlled, and the aim of accurately pre-tightening the main shaft bearing of the vertical lathe can be achieved.

Description

technical field [0001] The invention belongs to the technical field of modern mechanical design, and in particular relates to a device for pre-tightening a main shaft bearing in the form of a round nut for a vertical lathe. Background technique [0002] At present, my country's vertical CNC machine tools are developing rapidly, and the requirements for machine tool precision are getting higher and higher. The main shaft of the machine tool table is a large rotating shaft, and the inner ring of the bearing makes a circular motion with the main shaft of the work table during the rotation of the main shaft of the work table. However, during the rotation of the bearing with the main shaft of the worktable, there is a problem of excessive clearance caused by insufficient preload or too small clearance caused by excessive preload. As a result, the runout accuracy and radial runout accuracy of the machine tool spindle are inaccurate, thereby affecting the assembly quality of the e...

AI Technical Summary

Problems solved by technology

However, when the bearing rotates with the main shaft of the worktable, there is a problem of excessive clearance caused by insufficient pretightening force or too small clearance caused by excessive pretightening force

As a result, the runout accuracy and radial runout accuracy of the machine tool spindle are inaccurate, which affects the assembly quality of the entire machine tool

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