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Working principle of pillow packing machine

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working principle of pillow packaging machine pillow packaging machine is a continuous packaging machine with strong packaging capacity and can be suitable for various specifications for food and non food packaging. It can not only be used for the packaging of non trademark packaging materials, but also can use the drum material with trademark pattern printed in advance for high-speed packaging. In packaging production, due to the error between the positioning color codes printed on the packaging materials, the stretching of the packaging materials and the influence of mechanical transmission and other factors, the predetermined sealing and cutting parts on the packaging materials may deviate from the correct position, resulting in errors. In order to eliminate errors and achieve the purpose of correct sealing and cutting, automatic positioning must be considered in packaging design. Most of the solutions to this problem are to complete the design of continuous photoelectric automatic positioning system according to the positioning mark of packaging materials. The continuous photoelectric positioning system is divided into forward and backward type, braking type and synchronous type of two transmission systems according to the working mode of error compensation. This paper focuses on the design of forward and backward braking photoelectric automatic positioning system. 1 basic principle of braking photoelectric automatic positioning system in the process of continuous feeding, forming, bag making, filling and sealing of packaging paper on the automatic packaging machine, due to the printing error of positioning color code, accidental fluctuation of machine operation, operation and other comprehensive factors, the conveying speed of packaging paper is not synchronized with the horizontal sealing and cutting speed, resulting in the deviation of sealing and cutting position, Therefore, it is necessary to correct it at any time and compensate the error continuously. The comprehensive error is a variable, but for the packaging materials with high quality and printing accuracy, under a certain packaging speed, this error should be kept in a small range in each cycle of detection. In this way, the paper feeding speed and sealing and cutting speed can be measured and compared regularly (once every two bags) through the photoelectric positioning system. If the wrapping paper is too fast, the positive error system gives a negative compensation amount, that is, the paper feeding mechanism slows down to achieve compensation; If the wrapping paper is too slow, it is a negative error, and the system gives a positive compensation to increase the speed of the paper feeding mechanism. However, the given compensation value cannot completely eliminate the error, which may be over compensated or insufficient. Even if the error is eliminated, it will appear next time. Therefore, the design always makes the system compensate a little too much, and gives a compensation amount slightly greater than the absolute error value to artificially make it out of tolerance. When the measurement error is negative, an excessive positive value is compensated. After the next measurement and comparison, there must be positive errors. The positioning system automatically compensates for a given negative value, and then recovers the negative error. In this way, the positive and negative alternation makes the error controlled within a certain range. In this way, the cut-off part of the wrapping paper will jump around the correct position. This way of continuous positioning of wrapping paper by one in and one out is called “forward and backward” automatic positioning mode. Because its compensation is given by exceeding the work of the clutch and designing the mechanical paper feeding mechanism to have the lag effect of packaging paper when it enters work, the positioning system based on this principle is called “braking forward and backward” automatic photoelectric positioning system. The most basic principle of the continuous positioning system is to control the sealing and cutting position error of the packaging paper by taking the transverse sealing and cutting speed that determines the speed of the packaging paper as the reference standard and adjusting the paper feeding speed to synchronize with it. 2 Analysis of braking forward and backward positioning system. The following analysis is about the braking forward and backward photoelectric positioning system and the transmission system of packaging machine. Figure 1. The packaging process is as follows: the sheet packaging paper is led out from the drum 1, formed by the shaper 5 through the photoelectric detector 2, and packaged by the traction roller 6 and the longitudinal sealing roller 7. The packing bag filled with packing materials is shaped up and down and output, and sent to the transverse head 8 through the conveyor belt for transverse sealing, cutting and discharging the finished products. The transmission part is: the main motor M1 transmits the movement to the transverse seal transmission shaft, and then drives the transverse seal head to drive through the unequal speed mechanism 9. The unequal speed mechanism is used to adjust the instantaneous sealing and cutting speed of the transverse seal head 8 to synchronize it with the moving speed of the packing bag. The other way can be completed manually or controlled by single-phase servo motor through the adjustment of stepless speed change differential mechanism 13. The required bag length can be obtained by adjusting the continuously variable differential mechanism 13. The last route passes through the differential mechanism 18 to the claw conveyor chain. The differential mechanism 18 is an automatic adjustment mechanism, which is mainly used to adjust the synchronization between the claw conveying chain and the transverse head. In the packaging process, the photoelectric sensor is used to detect the moving speed of the packaging paper and compare it with the transverse sealing speed to judge whether it is slow or fast. The overrunning motor m3 is controlled by the overrunning clutch electrical system to stop its operation or braking, so as to achieve the purpose of error compensation. 42 Fig. 1 Diagram between transmission systems 1. Paper roll 2. Reflective photoelectric head 3. Package 4. Lower paper roller 5. Aligner 6. Traction roller 7. Longitudinal sealing roller 8. Transverse sealing head 9. Unequal speed mechanism 10. Overrunning clutch 11. Main motor 12. Stepless transmission 13. Servo motor 14. Conveying mechanism 15. Speed regulating mechanism 16. Paper feeding photoelectric sensor 17. Transverse sealing photoelectric sensor 18. Finished product 19. Claw differential Mechanism 3 speed detection and packaging paper length measurement in order to ensure the accurate positioning in the packaging process, the paper feeding speed and the transverse sealing notch speed must be accurately measured. At the same time, the length of packaging paper (each) in the production process is different. Therefore, how to automatically measure the length of packaging paper in the positioning process to make it consistent with our production settings is also very important. The paper speed measurement is completed by the photoelectric proximity switch 17. We record the pulse period output by the photoelectric proximity switch measuring the paper speed as t paper, and its derivative 1 /t paper is the transmission speed of the paper feeding roller. The cutting speed of transverse seal is measured by photoelectric proximity switch. We record the pulse period output by the photoelectric proximity switch of knife cutting speed as t knife, and its reciprocal 1 /T knife is indirectly calculated by the transverse sealing speed. In the packaging design, the packaging paper is tightly pressed on the paper feeding roller, and the linear speed of the pressing roller is the paper feeding speed of the packaging paper. V paper = π D /t paper, where D is the diameter of the paper feeding roller. The cut length after the transverse sealing notch l paper = V paper t knife = π DT knife /t paper 4 color code benchmarking method and adjustment to ensure the automatic positioning of the packaging, it is necessary to control the servo motor m2 to synchronize the paper feeding speed with the transverse sealing head notch speed. However, for the system designed to be synchronous, the original synchronous system will be out of step due to the accidental fluctuation of operation and operation disturbance. Therefore, it is necessary to add color code detection and control circuit to the basic synchronous system to correct at any time and continuously compensate the error. Ensure that the cutting and sealing position remains unchanged, which needs to be positioned with the help of the color code on the packaging paper. Color code positioning and benchmarking put forward certain requirements for packaging materials, photoelectric detection methods and color code printing. As far as packaging materials are concerned, they are required to have high density, uniform smoothness and thickness, and certain tensile resistance. Photoelectric detection methods can be divided into transmission type and reflection type according to different packaging materials. Transmission is mostly used for the detection of transparent packaging materials, while reflection is used for the detection of packaging materials that are difficult to transmit light or cannot transmit light. Generally, the design of high-speed packaging machine mostly adopts reflective photoelectric detection method, because it has high detection sensitivity. For the requirements of color code printing, the positioning color code must be able to block or pass light. At the same time, according to the size of packaged products and detection methods, the positioning color code must have enough shading area to ensure the reliability of signal during photoelectric detection. With good packaging materials, proper positioning of color code and correct measurement method of photoelectric shading reflective sensor, color code alignment and adjustment can be carried out. The pillow type multifunctional packaging machine designed according to the above principles and methods, coupled with microcomputer controlled paper length setting and adjustment and color code positioning system, completely solves the problem of automatic photoelectric positioning. The system has stable and reliable high-speed operation and accurate sealing and cutting. It is one of the most advanced and ideal models at present. Reference 1 Xu Lincheng, principle and design of packaging machinery, Shanghai Science and Technology Press, 1998.19 ~ 21 2 Peng Guoxun, design principle of automatic packaging machine, Xi’an: Northwest Institute of light industry, 1983.85 ~ 88 3 Liu Yunxia, analysis of positioning system of automatic packaging machine, packaging and food machinery, 2000 (2) · 8 ~ 11 4 Jiang haozhong, analysis of photoelectric automatic positioning system of pillow candy packaging machine, electromechanical engineering, 2001 · (5) (208 ~ 210) (received on April 12, 2002) hazard analysis and application of key control points Xu Weifang, AI Yongcai (Wuxi food company 214041), Wang Hongtu (Wuxi health and epidemic prevention station 214002)

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