Overload Protection And Remote Monitor System Of Electric Spindle Based On MEMS Technology

The motorized spindle is the most core component of the machine tool,whose value is about 30%of the cost of the whole machine tool.Due to improper operation or wrong machining programming,the motorized spindle collision knife is caused,and the damage to the spindle occurs sometimes.It is of great engineering significance to develop a fast detection sensor for spindle impact and protect the system in time to avoid or reduce spindle damage.A MEMS sensor is used to realize the rapid detection of the overload signal of machine tool.When the machine tool hits the knife,the reverse force of the impact causes the spindle motion to change rapidly,and when the MEMS sensor is installed on the spindle,the impact can be detected by the change of the triaxial overload.A spindle sensor is collected and processed quickly,and the alarm signal is sent to the PLC controller or to the control center of the machine tool to realize the rapid stop or reverse reversing protection.At the same time,this paper designs a prototype of overload data upload,analysis and remote monitoring system based on Internet of things.The thesis includes the following aspects:1.Design of electric spindle state monitoring sensor based on MEMS.The mechanical process of the cutter is analyzed and obtained system design parameters like best protection time,overload detection range,sampling speed and data transmission requirements.On this basis,the miniature sensor hardware is designed to meet the requirements of the internal installation of the main shaft,the semi-duplex communication protocol based on RS485,and the real-time upload system for the cloud management and intelligent application needs of the machine tool.2.Real-time monitoring test of spindle tool protection and machining parameters.The integrated sensor is installed on the vertical five-axis machine tool,the overload data in the spindle machining process is collected,and the time domain and frequency domain are analyzed.During the process of spindle collision,the sensor can measure the instantaneous overload signal and protect the output IO control signal from the machine tool system,which is feasible.3.Research and design of sensor data storage cloud platform.Based on the My SQL database,the data storage platform can be accessed by multiple users.Socket is used to realize multi-thread communication and parameter optimization,and the stability of data transmission is improved by combining confirmation mechanism and retransmission mechanism.Use Jupyter Hub to realize multi-user management;Use select multiplexing to realize the interaction between client and cloud server based on web client,making it more convenient to use.The related research and practical circuit design in this paper have certain meaning of reference for the protection and monitoring of motorized spindle collision knife.