Spindle bearing temperature detection system based on PLC

Nc machine tools available measuring method of spindle bearing temperature monitoring. By measuring the temperature rise in spindle bearing operation, to understand the main shaft bearing is normal. Bearing temperature generally limits the temperature not to exceed 45 ℃, if discover in monitoring the temperature of the bearing more than 70 - 80 ℃, it is necessary to stop the machine immediately to check. 1 installation and connection of nc machine tool can use thermal resistance, multi-channel digital instrument and the combination of PLC controller control system, to realize the main shaft bearing temperature detection. In the before, during and after bearing spindle, install four thermal resistance. Collect the temperature of the four points of PLC control system, to monitor different location bearing temperature rise. 2 control requirement and principle of temperature control system of the measuring point by using the thermal resistance temperature measurement, using multi-channel digital instrument to display the temperature of the spindle bearing. PLC controller to realize the parameter setting, remote monitoring, data storage and alarm processing, and other functions. In the process of the actual programming, register without writing, speaking, reading and writing PLC program, through the method of defining data, after the I/O variables, can directly use the variable name is used in the system control, operation display, data record and alarm, etc. A system set up the start button to start the control program, set up two red and green lights to display the temperature condition. The temperature of the four points within the scope of the requirements, green light, the spindle can be normal operation; When one is measuring point temperature reached highs, even if the spindle rotation speed is not up to par, the red light, CNC system displays the corresponding bearing are alarm at the same time. The operator will be shut down immediately the spindle, and according to the corresponding alarm, check of the condition of the main shaft bearing corresponding location, thereby avoiding the phenomenon of main shaft bearing grind. 3 conclusion modern PLC has strong function, high integration, strong anti-jamming capability, flexible configuration, steady work and other significant characteristics, widely used in modern industry automatic control. PLC can be extended some intelligent control module, a different control system, this paper mentioned the spindle bearing temperature detection is intelligent temperature control system with PLC controller as the core, convenient operation, good reliability, has important practical significance.
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