Application of the hottest sensor technology in SM

Application of sensor technology in SMT transmission system (structural robustness, also known as structural integrity and firmness, has further developed. China has become a global processing and production base for electronic products, and the demand for SMT equipment in the Chinese market is growing. Due to the constraints of economic development and other factors, China's SMT industry is unevenly distributed, mainly concentrated in the Pearl River Delta and Yangtze River Delta. The main products are auxiliary production equipment such as corner machines, transmission machines, feeding machines, etc., which are very competitive According to incomplete statistics, there are more than 10 manufacturers of such products in the three townships of Zhongshan. Therefore, manufacturers need to constantly update technology, strengthen research and development, make their products more complete, cheaper, and increase product highlights to attract customers and improve competitiveness. Adding a new ml100 series photoelectric sensor to the SMT transmission system provides a guarantee for the operation of the whole system

ml100 series photoelectric sensor is a new generation of compact series sensor launched by beijiafu China. It has the characteristics of high sensitivity, small size, high brightness LED status prompt, and can be used in dry and cold environment. It is specifically used in packaging equipment, belt transmission equipment, PCB processing equipment, etc

1 system composition

as shown in the sensor flow diagram 1 and Figure 2, assuming that a PCB is numbered 01, first enter the equipment Mounter (numbered tp01) through the transmission equipment telescopic connector (numbered cs01), and then enter the next SMT production equipment through the transmission equipment connector (numbered CS02), So repeatedly

2 working principle

2.1 transmission system process design

in order to determine whether the working state of equipment and transmission system is normal, this design scheme. Install a sensor 1 (No. cg01) at point a at the connection between the telescopic feeder cs01 and the patch machine tp01, install a sensor 2 (No. CG02) at the connection between the patch machine tp01 and the telescopic feeder CS02, and install a sensor 3 (No. CG03) at the equipment inlet of the next process. These three sensors are respectively located at the entrance and exit of the mounter and at the entrance of the next process to better test the tensile force, pressure, displacement, stiffness and other strength test and analysis equipment of the spring. They scan the number of the PCB board entering the mounter, the time T1 entering the mounter (tp01), the time T2 leaving the mounter and the time T3 entering the next process, and transmit these data to the database of the host. An alarm system is added at the conveying data port of the chip mounter, and an alarm system is added at the input and output ends of the transmission system, which is divided into: alarm systems according to the size deviation, appearance quality, strength and frost resistance. Because the access time of large equipment in SMT equipment is basically fixed (for example, the mounting speed of a small mounter is 3 S/block), and the operation time of each process is basically fixed, now the reference theoretical operation time of the mounter is set to T4, and the reference theoretical transmission time in the transmission system, that is, the transmission link, is set to T5 (all times are accurate to seconds)

when the PCB board (No. 01) enters the equipment Mounter (No. tp01) through the transmission equipment telescopic connector (No. cs01), the sensor 1 installed at point a ("No. cg01) scans the PCB board number and records the time T1 of entering the mounter (tp01). After passing through the mounter, it is output from point B, and the sensor at point B scans its number and records the time T2 of the mounter, In the equipment that enters the next process through the transmission equipment feeder (No.: CS02), the sensor 3 (No.: CG03) at point C scans its number and records the time T3 when it enters the equipment in the next process. Through the matching and comparison of these parameters, we can clearly analyze which link has a fault, when and what equipment can be reflected in time. When analyzing the data, the following two situations will occur:

1) when the number of the PCB entering and leaving the mounter matches the number of the PCB scanned when entering the next process equipment, the comparison can be made, so the following situations can be integrated:

① when | t2-t1-t4 | ≥ 0.5 (0.5 s is the allowable error of the system setting), that is, say that the mounter time T2 minus the time T1 entering the mounter, Then compare with the reference time T4 of the mounter equipment. When the absolute value of this comparison value is greater than or equal to the system allowable error of 0.5 s, it indicates that the mounter (No. tp01) is not working normally, and the alarm system installed at the input data port of the mounter will give an alarm and display a red light

② current t2-t1-t4