Protective device and method of machine tool spindle

Abstract

The invention provides a protective device and a protective method of a machine tool spindle. A hydraulic cylinder is connected to a counter weight, the hydraulic cylinder is connected with an electromagnetic valve, the electromagnetic valve is connected with an energy accumulator, the energy accumulator and the electromagnetic valve are connected with a hydraulic control system and an oil tank, a position detection sensor is installed on the surface of the spindle, and the position detection sensor and the electromagnetic valve are connected with a PLC (Programmable Logic Controller) in which a spindle power-off protection program is pre-set. When a machine tool is started, the hydraulic cylinder is off in an original position, and an eccentric sleeve is arranged in a front position; if the eccentric sleeve is in place, the machine tool normally grinds; and if the eccentric sleeve is not in place, the system gives an alarm, and the machine tool stops. When the machine tool normally grinds, the hydraulic cylinder is in a follow-up state; when the machine tool fails or is suddenly powered off, pressure oil is released by the energy accumulator, the hydraulic cylinder jacks, and the eccentric sleeve retreats, so that the spindle leaves the surface of a machined part for 1 to 3 mm, and the spindle which rotates at high speed is prevented from colliding with the machined part. According to the protective device and the protective method, the machined part and the spindle can be prevented from being damaged, so that the reliability, dynamic response speed and positioning accuracy of the spindle can be increased, and personal injury accidents are avoided.

Description

technical field [0001] The invention belongs to the field of mechanical equipment, and in particular relates to a large-scale machine tool spindle protection device and a method thereof. Background technique [0002] At present, the curve grinding devices of domestic roll grinders basically adopt the machine tool with static pressure eccentric sleeve structure, and the grinding wheel spindle of the dynamic and static pressure structure is installed in the eccentric sleeve. During normal grinding of rolls, the full digital AC servo motor drives the ball screw to rotate, the ball nut moves up and down through the positioning of the linear rolling guide pair, and then drives the high-precision static pressure eccentric sleeve to swing at a small angle, so that the static pressure eccentric sleeve mounted on the static pressure eccentric sleeve The main shaft of the grinding wheel inside makes a slight gap-free cutting (or withdrawing) movement relative to the roller surface. T...

AI Technical Summary

Problems solved by technology

If the spindle malfunctions, not only the workpiece and the spindle will be damaged, but the tool or grinding wheel will also break and cause personal injury.

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