Overrun protection and releasing system for numerical control machine tool

Abstract

The invention discloses an overrun protection and releasing system for a numerical control machine tool, and relates to an improvement for an overrun protection and releasing method for the numerical control machine tool. The overrun protection and releasing system is mainly used for performing safety protection on overrun of the numerical control machine tool and releasing. When an overrun alarm of the machine tool occurs and overrun releasing is performed on the machine tool, machine tool damage accidents such as machine tool impact and derailing from a guide rail caused by error determination for the operation direction of the machine tool are prevented. The overrun protection and releasing system comprises a driving system, an electric control circuit, an I / O interface circuit of a PLC and a PLC programmable controller. The overrun protection and releasing system can realize automatic determination for the overrun direction of the machine tool. When an overrun releasing operation is performed, if an operation direction is wrong, driving for the shaft of the machine tool cannot operate because of no enabling signal; and when the operation direction is right, the enabling signal for the machine tool is normal and the shaft of the machine tool leaves an overrun limit switch, the overrun alarm is released automatically, thereby preventing machine tool damage accidents caused by an operation mistake of an operator. The overrun protection and releasing system for the numerical control machine tool has advantages of simple structure, easy realization, convenient use, high safety, high reliability, low maintenance cost and low manufacture cost.

Description

【Technical field】 [0001] The invention belongs to the field of numerical control machine tool equipment, and relates to an overtravel protection and release system of a numerical control machine tool. 【Background technique】 [0002] At present, the overtravel protection and release method of CNC machine tools adopts the method of limit switch plus overtravel release button (or key switch). When a certain coordinate axis of the machine tool is pressed to the limit switch during operation, the machine tool has an overtravel alarm. Unable to run, press the overtravel release button (or key switch) at this time, short-circuit the limit switch signal, the machine tool alarm will be cleared, and then the operator needs to judge the overtravel direction of the machine tool, reversely drive the machine tool back, so that the coordinate The shaft disengages from the limit switch, eliminating the alarm. Although this method is simple in structure, in the actual operation process, acc...

AI Technical Summary

Problems solved by technology

Although the structure of this method is simple, in the actual operation process, accidents that damage the machine tool, such as the collision of the machine tool or even the detachment of the guide rail, often occur due to the operator's judgment and misoperation, and the safety hazards are relatively large.

The method of the present invention solves the above problems, and there is no application case in the numerically controlled machine tools at home and abroad at present

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