usb接口线程读取usb接口设备的数据，然后将数据发送给主线程，主线程实时显示数据，并且将其保存到数据库中。（运行时需要usb数据采集卡的支持）-usb interface thread usb interface equipment to read the data and then send the data to the main thread. the main threads real-time display of data, and to the preservation of i