External-adjustable constant-pressure pre-tightening device for motorized spindle

Abstract

The invention discloses an external-adjustable constant-pressure pre-tightening device for a motorized spindle. The external-adjustable constant-pressure pre-tightening device comprises a shell, a bearing support system and a pre-tightening adjustment system, wherein the bearing support system is consist of a bearing, an inner space ring, an outer space ring, a bearing block, a linear bearing, a fastening bolt and the like; the pre-tightening adjustment system is composed of a spring baffle plate, a bolt, a connecting plate and an adjusting bolt; the spring baffle plate is mounted in the shell, and the ear part of the spring baffle plate is connected to the connecting plate through the bolt; the adjusting bolt extends out of a rear cover of the motorized spindle through a center hole of the connecting plate. During working, the pre-tightening force applied to the bearing can be adjusted in real time by rotating the adjusting bolt. As an external-adjustable constant-pressure pre-tightening force mechanism is arranged between the shell of the motorized spindle and the bearing block, the axial preload of the bearing of the motorized spindle can be adjusted in real time according to different rotating speeds and different loads, the motorized spindle can be always in an optimal working condition, the internal heating phenomenon of the bearing is reduced, and the service life is prolonged. The external pre-tightening force is adjustable, so that the operation is convenient, and meanwhile an external complex device needed by the way that the pre-tightening force is adjusted through electromagnetism or hydraulic pressure is avoided.

Description

technical field [0001] The invention relates to the field of mechanical equipment, in particular to an external adjustable constant pressure pretension device of an electric spindle. Background technique [0002] As the key component of CNC machine tools, the electric spindle is widely used. According to the characteristics of CNC machine tools, the electric spindle is required to adapt to high-speed cutting on the one hand. In high-speed cutting, it is generally finishing machining. The cutting amount is small and the speed is high. The spindle is under less force. The spindle bearing can meet the requirements under a small pre-tightening force; on the other hand, the electric spindle must meet the low-speed cutting requirements of the machine tool. At this time, it is often rough machining and the cutting volume is large. Larger cutting force of the machine tool. According to the requirements of the working conditions of the spindle, real-time adjustment of the preload o...

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Problems solved by technology

[0003] At present, the preload application methods of electric spindle bearings mainly include positioning preload, constant pressure preload, and preload application through electromagnetic or hydraulic control; positioning preload and constant pressure preload determine the preload of the bearing during the assembly stage. , it cannot be adjusted in real time according to the cutting conditions of different working speeds of the spindle during use; the preload application of electromagnetic control requires an electromagnetic proportional valve and an external power supply, and the preload application of hydraulic control requires a large number of external hydraulic devices; therefore, it is necessary Develop a simple and convenient preload device that can be adjusted outside the main shaft to improve the internal force of the bearing to meet the requirements of different speeds and different working conditions

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