The Application And Research Of Portable Pneumatic Marker Based On The MCU

The application of the pneumatic marking is very extensive in the industrial field.The present marking system is so expensive or big.These defect limited the pneumatic marker's application in certain extent.After analyzingt the present situation of marker,developing tendency and the faulty,this paper provide a new NC marking system.The objective is improving the portability of pneumatic marker and reduction of cost.The struct of this pneumatic marking system has double layer.Top layer is PC which deals with graphics,creats and transfers marking files; Lower layeris the MSC-51 which controls the move of the stepping motor in X and Y direction.At the same time,MSC-51 controls the high frequency micro-impact movement of the pinhead.Compared with other marking system,this pneumatic marker characteristics is the application of USB at the communication of PC and MSC-51.This paper provides the research and design of the portable pneumatic system and gives out the main hardware circuit and control softwares.The hardware circuit include :①LCD display module which display all kinds of information in the process of print,such as contents and velocyty of print.The control core of this module is OCMJ.②The keyboard interface circuit which realize the input of command and the setting of parameter.This module use the control chip 8279 as the keyboard controller.③Stepping motor drivers.It's main component is A3972 chip.It can provide the three work mode:32 subdividsion driving,16 subdivsion driving and 8 subdivision driving.④USB Flash Disk dirving module.This module achieve the function that MSC-51 read/write USB Flash Disk.The design of the circuit useed the control chip CH375.The control soft's main contents are as follows :①Interpolation software module.This part exploit point by point comparison method in the pulse incremental interpolation algorithm.②USB Flash Disk file manipulation module.This part achieve the reading and writing,editing and deleting operation of FAT files on the USB Flash Disk by the MSC-51.③Management software which deal with the input form keyboard.④Motion control module of pinhead.This part control pinhead's moving and the high frequency micro-impact in the XOY plane.⑤System management software which make all parts coordination work and complete the task of mark.The research contents of this paper not only establish strong fundmental for future developing new industrial pneumatic marker, but also have the important realistic meaning and extensive application prospect.