PartI ??/FONT>Preface
The reconstruction scheme of GD121 volume weight control system with microwave unit, using the platform design, the weight control system and OPC server are integrated together, and are independent of each other, forming a modular structure. The system can accurately diagnose and eliminate the fault of single cigarette. The parameter setting and data acquisition are carried out through the touch screen of industrial control computer. Good man-machine interface, easy to operate on-site control and maintenance.
Part II??/FONT>Microwave Scanning Head
The microwave scanning probe has the following characteristics:
By the microwave detection control system according to the operating personnel need any power or power to start, and do not need preheating, no zero, may the normal work, smoke density and moisture content of the detection accuracy and reliability is not affected. Have different brands of cigarettes can detect the density and moisture content, no need to set or change any parameter detection.
By microwave probe transmission power is very small (compared to the ordinary mobile phone microwave power decimal 100 times), without any harm and the influence on the surrounding environment and personnel.
By due to the special microwave transmitting and receiving device and special electronic circuit, the electrical parameters of microwave components to solve the scene when easy to drift and fundamentally affected by various environmental changes (such as vibration, temperature, humidity, dust) effect, in addition, a large number of the laboratory calibration test, we have mastered the mathematical sciences the relationship between microwave signal with the density and moisture content, we developed a microwave cigarette weight control system output signal accurately and reliably reflect the weight and moisture content, thus ensuring the cigarette weight detection and control precision.
By the microwave cigarette weight control system output signal not only reflects the cigarette density reflects the water, thereby eliminating the influence of tobacco caused by moisture detection device, which is the traditional detection device can not solve the problem. By using high-speed computer microwave signal processing, so that the weight of the output signal of the sampling interval is less than 80 microseconds, fully able to meet a variety of high speed rolling speed set the requirements of online detection.
By the detection system through high temperature test, vibration test and continuous power test of the rigorous inspection and testing of hardware and software, safe, stable and reliable, convenient use and maintenance.
a.technical parameter??/FONT>
1) power supply: AC110V + 10%; 50HZ + 10%;
2) microwave transmitting power: 10mW;
3) the sampling frequency of each sampling interval time: <80 s (12500 times / sec);
4) work environment:
Temperature: 0-60 DEG c:
Air humidity: without condensation (<90%)
5)density measurement range: 0-0.6g/cm3 (cigarette density about 0.20-0.35g/cm3); 6, moisture measurement range: 0-25%
Microwave scanning head picture
Part III??/FONT>Weight control system
The microwave detection system of cigarette density signal acquisition to conversion to digital quantity to bus communications transmitted to weight control module, weight control module according to the synchronous pulse signal can be calculated for single cigarette weight and density segmentation. Then the weight control module for 16 cigarettes to calculate the single weight average value is adjusted according to the weight control dead time setting, in addition to the weight control module and bus communication each cigarette weight data to smoke sampling and remove module. Smoke sampling and remove module the weight control module to send the cigarette weight, smoke density value and the PC software set on the control of overweight, super light, soft and hard point, the end of the empty out threshold comparison, any index exceeds the set value such as the smoke as a substandard cigarette support, if the corresponding function of eliminating the smoke as the opening of the smoke eliminating waste removed, the corresponding number and transmitted to the PC control software for data statistics. At the same time, the position signal of the dial plate of the original machine is collected to realize the functions of stopping and positioning the leveling plate ??/FONT>
Leveling plate control mechanism, leveling plate position sensor and waste smoke elimination mechanism are the use of the original machine, and the need to replace the probe in the smoke outlet at the tablet computer and on the main circuit board within the cabinet to increase the weight of the required control module ??/FONT>
The weight control system developed by our company has the following advantages ??/FONT>
1.the smoke sampling point is 50 equal points per cigarette, which can accurately measure the density and weight of cigarettes, so that the average weight value of a batch of cigarettes is more accurate.
2.cigarette weight control and high precision, the system provides 15 inch color touch screen man-machine interface to set weight value to achieve full digital operation, also can through the host computer via the network digital set value assigned to the machine weight control system. In addition, according to the measured weight of the current cigarette weight of the machine, the weight of the cigarette can be accurately adjusted to a preset value by a touch screen without repeated measurement and adjustment.
3.cigarette weight control implementation of high precision, a range of up and down movement of the disc and the interval time is calculated by a number of average weight of cigarette production value and the current production of 8 cigarettes just average weight value, according to the optimal control theory to determine the.
4.a disc weight control actuator with position sensor for capillary disc upper and lower motor position closed-loop control can improve the control precision of cigarette weight, and can also play in the hood shut down and just machine, capillary disc in the correct position and to keep control of the upper and lower motor chopper disk limit control and alarm.
5.the use of CPU has the characteristics of high speed data processing, can judge whether each cigarette overweight or ultra light, whether soft or hard point cigarette, and you can choose whether to eliminate the defects of smoke.
6.increase the sampling function of target weight and can be used to test the system.
7.the continuous occurrence of weight defects cigarette, you can choose to control the original machine downtime.
8.increase the recipe management function, set up all kinds of cigarette brand parameters in advance. When you change the brand, you only need to choose the brand name, all parameters are automatically generated.
9.shutdown, before shutdown system to calculate the average position of the automatic control disc chopper, shut down when the capillary plate is in the average position, so as to guarantee the cigarette weight and then boot properly.
10.Various data acquisition functions associated with weight and interfaces to local area networks are provided ??/FONT>
