Introduction to the operation process of the granule packing machine
Under normal circumstances, the film of the roll is drawn into the bag forming machine through the guide roller under the traction of the longitudinal sealing roller to form a paper tube. The longitudinal sealing roller seals the paper tube to the two edges while pulling. The transverse sealing is then carried out by closing the transverse sealing roller. Similarly, each horizontal sealing action can simultaneously complete the upper opening of the upper bag and the upper opening of the lower bag, and cut off the separation. The filling of the material is completed before the paper tube is pulled down by the longitudinal seal to the horizontal closure.
The granule packaging machine is a widely used model, which has become a more widely adopted design because of its rationality and scientificity. A variety of pocket shapes can be designed according to this packaging principle. For example, a pair of longitudinal sealing rollers are added, so that two pairs of longitudinal sealing rollers are symmetrically arranged on both edges of the paper tube, and at the same time, the longitudinal sealing is performed to form two vertical sealing seams, and the pocket shape produced by the horizontal sealing is a four-side sealing pocket. The bag making method is mainly based on simplifying the former, making the processing of the former simple and cost-saving, using a pair of symmetrical formers, then using two paper feed rolls, and simultaneously feeding paper on both sides. The packaging is symmetrical and beautiful, playing a role of symmetry and beauty. In summary, the vertical continuous bag four-side sealing packaging machine combines longitudinal sealing and drawing into two pairs of longitudinal sealing rollers, saving space, improving efficiency and simplifying the structure. Taking into account the convenience, low cost and other characteristics, this time the selection of vertical continuous bag four-side sealing packaging machine.
Transmission system design To achieve the whole process of packaging, it is mainly to realize the traction film removal, blanking and sealing of the packaging. That is to say, from the plastic reel to the Zui final product, the following process is required.
After the power is output from the reducer, the main shaft is driven by the belt drive, and then distributed by the main shaft to form a three-way transmission, which drives the quantitative feeder 8, the longitudinal sealing roller 6, and the transverse sealing roller 5, respectively. The three-way drive is as follows:
1) The main shaft I drives the gears Z52 and Z20 of the duplex gear through the gear Z20, and then passes through the duplex gears Z52 and Z36 to the gear Z36 drive shaft VI to rotate the dosing feeder 8.
2) The spindle I drives the output shaft III of the shaft-variable transmission of the continuously variable transmission via the bevel gear Z30. Through the differential transmission device, the compensation speed outputted by the servo motor 11 is integrated, and then the pair of incomplete gears Z60 are rotated to drive the shaft V to rotate, thereby driving the longitudinal sealing roller 6 to rotate relative to each other.
3) The main shaft I drives the eccentric sprocket mechanism 4 of the shaft III through the bevel gear Z36 to output a non-equal speed movement, and drives the gear Z18 to drive the transverse sealing roller to rotate relative to the Z30 and the pair of Z30. The adjustment of the heat sealing speed can be achieved by adjusting the eccentricity value of the eccentric sprocket.
The traction acting on the longitudinal seal roller should be equal to the force exerted by the roller on the plastic film to allow the plastic film to slide down at a uniform speed.
Heat seal design
The plastic film and its composite material are commonly used packaging materials in the automatic bag making and packaging machine, especially the multilayer composite film, which is widely used in food packaging because of its airtightness and high strength.
The sealing of the plastic film adopts a hot-melt sealing method. The specific operation is: heating the two contact faces of the plastic film to be in a molten thermoplastic state, and then applying pressure to the sealing portion to seal the two films. The face fusion seal is firm. The factors affecting the quality of the sealing are mainly the heating temperature, the sealing pressure and the action time. There are many forms of hot-melt sealing methods. The commonly used ones are resistance heating method and pulse heating method, and high-frequency electric heating sealing, ultrasonic heating sealing, electromagnetic heating sealing and infrared heating sealing. Each method is suitable for a wide range of plastic materials. In the automatic bag-filling and packaging machine, the heat-sealing method of resistance heating is widely used, because of its simple mechanism and convenient regulation. Moreover, the film used for food packaging is mainly polyethylene and its composite materials, that is to say, mainly polyethylene is used as the heat sealing material, so the resistance heating sealing method can fully meet the requirements.
There are two sealing devices in the continuous bag making and packaging machine: vertical sealing device and transverse sealing device, which respectively realize longitudinal seam sealing and lateral sealing cutting of the packaging bag. They all use a resistance heating sealing method.
Design and calculation of longitudinal sealing roller
In the continuous automatic bag filling and packaging machine, since the film is continuously conveyed, the longitudinal seam sealing is continuously performed. For this purpose, two pairs of roller-type resistance-heated hot-melt sealers are used to achieve continuous longitudinal sealing. Here, the hot-melt sealing roller not only completes the longitudinal heat sealing of the packaging film bag, but also plays a role in the traction conveying of the packaging film. That is to say, the traction and longitudinal sealing are carried out simultaneously, and the traction roller is also a longitudinal sealing roller.
Uniform and fine mesh is processed on the sealing cylindrical surface of the longitudinal sealing roller to increase the firmness of the sealing, so that the heat sealing seam is beautiful and the quality is guaranteed. In addition, since the longitudinal sealing roller is heated for a long time during operation and is continuously relatively rolled, it is required to have better comprehensive mechanical properties. In actual production, alloy structural steel can be used, such as 40Cr steel.
Granule packing machine picture: 
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Granule packing machine
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