In automated injection needle wear force tester solution

Pick to: this paper mainly introduces in product application in medical injection needle wear strength testing instrument. Keywords: needle puncture force test solution 1 introduction medical injection needle wear strength testing instrument is production test equipment, electrical integration of medical apparatus and instruments is one of the important products in Shanghai some medicine machine company. Widely used in the production of medical needle manufacturers. This machine use PLC control stepping motor to make medical needles under exercise its through the film, in the process of penetrating through the pressure sensor to the needle by force after AD conversion through the communication to the PLC, touch screen print function to print the test report, after data calculation and curve of judgment combined with data, to detect the quality of products needle puncture force parameters. Solution 2. 1 project design ( 1) Force transducer initialization: through the force transducer and communications to reset, then according to the average weight of calibration, is initialized force transducer data processing. （ 2) Record real-time data: according to the needle down by stepper motor transmission, when the needle touch the bottom of the film, the PLC according to determine stress sensors have a jump start each 100 ms record data, the needle penetration film 10 mm, the needles by stepper motor, up until walked to the ceiling. （ 3) Data curve analysis described: ceiling arrived, PLC immediately began to trace just a needle from the needle touch the bottom of the film start to the end of the needle penetration film 10 mm, this time runs at each location of stress curve ( Abscissa, ordinate for forces exerted to location) , not only have to find out the curve of the first four turning points ( This is a tricky thing) And record their force and position, and find out the maximum, and the curve of the vertical will be updated according to the size of the largest stress in real time, If find a needle in the operation process the maximum stress is less than 1, the ordinate is 0 1 n, if within 2 n, the ordinate is 0 2 n, and so on. （ 4) Store data processing: after each do a test, in each, one of the biggest stress data record down, and then the real-time stress data, several times the mean value and deviation value according to a specific formula calculated, if the user to artificially removed a certain value, then the two values to real-time update, let users to determine whether the needle is qualified. （ 5) Print the curve and data: according to the requirements of each data must be recorded, the customer request every data must be printed, the function of the use of computer to print complete this requirement. 2. 2 electric control design of medical injection needle wear tester by PLC, load institutions, ranging institutions, printers and other parts. One of the load system adopts special 0. 001 cattle and high precision pressure sensor, and the test can be in touch screen can be real-time print, belong to high-end models among peers, needle shape for various shapes and sizes can accurately test. Master controller to choose DVP - SC series 12 sc11t type PLC controller ( 12SC） 。 In SC series PLC controller is a special function dedicated motor control PLC, SC series PLC host 12 I/O points, module can be extended more than 200 points. SC series have high-speed pulse output and the pulse counting function. High-speed pulse output support 2 PM ( 日元,日元) Independent high-speed pulse output function, up to 100 KHZ, Combined frequency width 130 KHZ) 。 Built-in RS - communication port With RS - 232 485, compatible with MODBUS RTU/ASCII communication protocol. Two-axis interpolation function support positioning control instruction: through the ZRN ( The origin return) / DRVA( Absolute addressing) / DRVI( Relative positioning) Instructions, SC series can be easily and make all kinds of motion control of servo match demand. The man-machine interface to choose up to 5. 16 gray-scale DOP - 7 in monochrome A57BSTD type touch screen. System architecture is shown in figure 1. Figure 1 piercing force tester system block diagram 2. 3 control difficulties which the difficulty is the processing of technical details, such as communication and sensor ( Sensor complicated agreement is not a standard protocol) , curve, a turning point of capture, real-time processing of data, print control, especially the capture of communications and a turning point, are some of the things some pains. 3 sets of automation brand characteristics reached the dentsu's parent company for the world famous electronic manufacture multinationals - — In electronic group, as group in wujiang, jiangsu province has a large production base, is the world's largest power management system and the supplier of inverter, encoder, human-computer interface, PLC, servo, such as the thermostat of mechanical and electronic products manufacturers. Zhong da dentsu mainly for China's most growth potential of communication and automation market to provide equipment and services. Its main products and services including video equipment, power systems, broadband data and mechanical and electrical automation four aspects. As the industrial control industry well-known manufacturers, especially in domestic can only do so comprehensive manufacturer of mechanical and electronic products, by using their products to customers from all walks of life to provide comprehensive solutions. The best product performance, the national and global coinsurance circumspect service to ensure clients' interests. Zhong da dentsu service system all over the country. With the increasing number of units of product, the function is becoming more and more complete, to provide customers product control system function selection and use more and more convenient and more and more diversified.
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