Linear motor magnetic isolation and anti-chip technology Linear motors have evolved from rotary motors in structure and principle. It consists of a primary core and a secondary core, and the secondary core is a permanent magnet. After a three-phase sinusoidal current is applied to the core of the primary part, an air gap magnetic field is generated. When the three-phase current changes with time, the air gap magnetic field will move in a straight line in phase sequence, and the secondary core is in this moving magnetic field. Current is generated under cutting and electromagnetic thrust is generated. If the secondary core is fixed, the primary core will move in a straight line. The application of linear motor technology is to replace the traditional rolling screw and servo motor feeding system with linear motor. This has greatly changed the structural design of the machine tool, and also brought some new problems.
The locking block structure diagram is a difficult point for the application of linear motors on lathes. Other machine tools, such as vertical machining centers and EDM machines, can install linear motors away from the processing area, avoiding the intrusion of chips and coolant into the linear motor during machining. These machines are anti-dust, anti-magnetic and lathe. It's easier. In addition, since the linear motor itself has a high moving speed, it has a high positioning accuracy in combination with a high-precision grating scale, so that high machining accuracy and production efficiency can be obtained. In order not to limit the advantages of the linear motor itself by considering only anti-dust and anti-magnetic, our factory has solved this by designing, after repeated consideration and comprehensive consideration, in the case of meeting the requirements of linear motor use, high-speed fully enclosed anti-magnetic pull cover problem. The measures of improving the structure of the hood and the use of anti-magnetic materials can achieve anti-dandruff and anti-magnetic, and the movement speed is high.
The lightweight structure of the moving parts of the feed system is one of its advantages. The power of the linear motor is determined by the amount of suction. The required linear motor has low power and low suction force. Conversely, if the linear motor has high power, the suction force is also large. In use, in addition to the sufficient cutting force, the moving parts must withstand the suction force of 1500kg or more of the linear motor to maintain the precision and stability of the long-term working of the machine. This requires the moving parts not only to withstand these forces, but also to have certain Rigid, but also to minimize its own weight.
The heating linear motor that controls the linear motor generates a certain amount of heat during operation. If the temperature is too high, it affects the performance of the motor, especially under the use condition of 45° installation. Because it does not have the brake function itself, after the power is cut off. The motor will be in a falling state. After the power is turned on, the linear motor is always in working state. When the motor is selected, the precision cooling is adopted. The primary part core and the secondary part core of the linear motor are cooled, and the cooling medium is controlled by constant temperature, so that the linear motor can quickly dissipate heat. , to maintain its performance. In addition, in order to avoid heat generation, when the machine tool is in the standby state for a long time, it is controlled by the hydraulic locking block to be in a self-locking state.
The lid sensing uses a reflective infrared emission sensor to obtain information about the lid. When a cover passes through the drying tunnel, the infrared sensor generates a pulse signal. After filtering and shaping, the signal is counted by an external counter, and the number of the single-chip microcomputer is accumulated to calculate the number of current shifts. The keyboard is convenient for setting the input of working temperature, PID parameters, upper and lower limit temperature, etc. On the control panel, a 4×4 keyboard, 10 numeric keys, plus function keys are also designed. The display uses a liquid crystal module that can display 4 rows and 16 columns of Chinese characters to display parameters. The MCU sends the relevant data and the coordinates of the specified display position to the LCD module through the RS232 serial port, so that the data can be conveniently displayed in the designated place.
Software structure of the control system The software of the control system adopts a modular structure and is mainly composed of the following subroutines. Keyboard scanning subroutine: return key value, the keyboard parameter processing program performs related operations according to the key value; external counting processing subroutine: automatically counts in the interrupt, each time the corresponding variable is modified and the flag is set, in the main program according to The change of the flag bit to perform related operations; temperature sampling: sampling and filtering the voltage of PT100, compared with the previous original data, if there is a change, then setting the relevant flag bit, entering the temperature parameter processing subroutine for table lookup and Linear interpolation, get the temperature, refresh the relevant variables; temperature overrun processing: compare the current temperature with the upper and lower limits, if the over limit is alarmed; LCD screen content refresh: if the parameter change flag is set, send the parameters to the LCD screen, Refresh the display content; PID control program: If it is in the running state, calculate the PID output value according to the formula, otherwise directly reset the PID output value to zero, then enter the dead zone and limit processing, and convert the final value into PWM. The duty cycle data is set to the PWM register.
Conclusion The SOC-rich on-chip resources greatly improve the real-time performance of the control system and reduce the volume. The control accuracy of the temperature is improved, and the output power and frequency are conveniently adjusted. The human-machine interface of the liquid crystal display is more friendly and intuitive, which facilitates on-site debugging and reduces costs. The control system has been commissioned on a packaging line.
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