Overload protection device for direct-current servo motor of numerical control machine tool

Abstract

The invention provides an overload protection device for a direct-current servo motor of a numerical control machine tool. The overload protection device comprises an electronic switch, a current detection circuit, a front-end detection circuit, a switch control circuit and a detection control circuit, the electronic switch is arranged at the power supply end of the direct-current servo motor and is used for controlling the on-off of power supply of the direct-current servo motor; the front-end detection circuit is used for detecting the voltage of the input end of the electronic switch, performing overvoltage judgment and outputting a high level during overvoltage; the current detection circuit is used for detecting the working current of the direct-current servo motor and carrying out overcurrent judgment, and outputting a high level when the direct-current servo motor is in an overcurrent state; the input end of the detection control circuit is connected to the output ends of the front-end detection circuit and the current detection circuit, and the detection control circuit outputs a level control signal to the switch control circuit according to the high level output by the current detection circuit and the front-end detection circuit; the input end of the switch control circuit is connected with the output end of the detection control circuit.

Description

technical field [0001] The invention relates to a protection device for a numerically controlled machine tool, in particular to an overload protection device for a DC servo motor of a numerically controlled machine tool. Background technique [0002] CNC machine tools are currently widely used in industrial production. In CNC machine tools, DC servo motors are the key components of CNC machine tools, which are used to provide power for the actions of CNC machine tools. In CNC machine tool processing, the stability of DC servo motor load affects CNC machine tools. stability. [0003] The increase in the load of the DC servo motor and even the overload is mainly reflected in the current change of the DC servo motor. In the prior art, the overload protection of the DC servo motor mainly detects the current and temperature of the DC servo motor through a current sensor, a temperature sensor, etc. The current and temperature are analyzed and judged. In this process, a control ch...

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Problems solved by technology

[0003] The load increase or even overload of the DC servo motor is mainly reflected in the current change of the DC servo motor. In the prior art, the overload protection of the DC servo motor mainly detects the current and temperature of the DC servo motor through current sensors and temperature sensors, and then according to The current and temperature are analyzed and judged. In this process, a control chip is required. Due to the use of the control chip, the circuit structure is complicated, mainly because of the peripheral construction of the chip and the protection of the chip. On the other hand, when the input signal of the chip has interference, it is easy to Misjudgment is caused, and when the chip works for a long time, it will also cause misjudgment, which makes it difficult to accurately implement the overload protection of the DC servo motor of the CNC machine tool

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