In the current work, in order to reduce the error caused by the valve closing time, the error caused by the valve closing time can be compensated by adjusting the meter coefficient, that is, FK1(t1+12t2)=FK2t1K1=F(t1+12t2)Ft1K2, where K1 is The meter coefficient after the flow meter is corrected, K2 is the actual meter coefficient of the flow meter, Ft1K1 is the volume of the barrel preset by the numerical control device, F(t1+12t2) K2 is the volume of the actual filling barrel, and Ft1K2 is the numerical control oil filling device. The preset preset barrel volume is a constant; 12Ft2K2 is the compensation value of the error caused by the valve closing time, and t2K2 is a constant; the method considers that the flow rate is stable during the barrel filling process, that is, F is a constant.
However, due to the actual work, the flow rate is changed, that is, 12Ft2K2 is a variable; and the closing time of the A and B valves is often different, so if the meter factor is adjusted according to the closing time of the A valve according to the formula (4), the B valve is often caused. The volume error of the controlled barrel liquid is too large. For example, let V be the error caused by the difference between the closing time of the two valves A and B, V is the volume of each barrel, and F3 is the output pulse frequency corresponding to the flow meter when the B valve is controlled, F2 For the A valve control, the flow corresponds to the flow meter output pulse frequency, and F2K1t1=F3K1t1, then the relative error of the barrel volume controlled by the B valve is corrected. First, the closing time of the A and B valves should be measured.
The system design adopts RS-485 computer network, GENIE configuration software, ADAM-5000 series data collector and LCB-9800 series stainless steel oval gear flowmeter combined with low pressure loss and wear resistance. The working principle of CNC oil filling network system, its working principle as the picture shows. Because RS-485 network is the most widely used bidirectional transmission standard in the industry, it has the characteristics of multiple stations, fast transmission speed and long transmission distance, and the system only needs a pair of completely isolated twisted pairs, which can greatly reduce Wiring materials, reducing the use of communication components (such as repeaters, filters, etc.), simplifying installation and saving network construction costs; ADAM-5080D is a counting/frequency output module with two counting/frequency channels, each channel It has high and low limit alarm function, and has manual control start and stop function. It can be controlled independently from the computer during operation and can exchange data with the host at any time. One ADAM-5080D constitutes a set of dual gun control mechanism, one channel counts, another channel Measurement frequency, valve closing time compensation; GENIE30 configuration software is a Windows version of the measurement and control and development software, with multiple functions such as data analysis and report output, including: easy to operate human machine interface, standard VisualBasic program Write environment and provide multiple connectivity tools, including built-in DDE, automatic OLE and IPX network communication, embedded ODBC Can directly enter a wide range of databases by SQL; LCB-9800 series stainless steel oval gear flowmeter, with corrosion resistance, high accuracy, low pressure loss, stable output pulse frequency, adjustable duty cycle, suitable for long-distance transmission, can Widely used in small flow, low viscosity liquid, automatic control system, etc.; therefore, the numerical control oil filling network system has the characteristics of simple structure, flexible expansion, high accuracy, good reliability and high efficiency, which can be widely applied.
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