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In the process of paper gravure printing, the low-quantity paper is usually picked up by the lap joint, while the paper with the basis weight of more than 250g/m2 is connected by the docking method, which avoids the serious damage to the printing unit caused by the superposition of the two layers of paper. Shock. Among them, the high-speed drum type docking is a common method of receiving materials in the paper gravure printing machine. Below, the author combines some understandings in the design process of high-speed drum type docking unit, analyzes its working principle, control of anti-adhesive rubber roller and precision requirements, hoping to help more people in the industry to understand the high-speed drum docking technology. Achieve safe and high-speed production. The working principle of the high-speed drum type docking is as follows: Firstly, a 15° bevel angle is cut at the new roll head, along which the positive tape is bonded under the material head, and a steel is placed along the oblique side of the material head. The belt, the lower edge of the steel strip is aligned with the edge of the material, and the steel strip, the positive tape and the new roll head are bonded together by a plurality of thin tapes, and the blade is broken at the bonding point, and then the segments are evenly pasted on the lower edge of the steel strip. double-sided tape.
Then, draw a diagonal line on the surface of the rubber roller with an angle of 15° in the horizontal direction, which corresponds to the oblique angle at the new roll head, and then a piece of tape with a width of 150 mm (referred to here) For the "anti-adhesive tape"), the rubber surface is applied upwards along the diagonal line of the anti-adhesive rubber roller to bond it with the anti-adhesive rubber roller, and the blade is broken at the bonding point, and finally the reverse The rubber roller can be placed in the middle.
When the material is ready for pre-feeding, the new volume starts pre-driving. Press the “Receive†button. After the system detects the first paste signal, the paper roller is pressed down. After the system detects the second paste signal, the system cuts. The knife immediately cuts off the old roll, and the new and old roll heads are bonded together under the action of the positive tape. At the same time, the steel strip is bonded to the old roll under the action of the double-sided tape. When the steel strip detection photodetector detects the arrival of the steel strip, the photoelectric encoder mounted on the docking drum starts counting. Subsequently, when the joint of the new and old rolls runs to the baffle of the docking drum, the baffle cylinder acts, relying on the mechanical structure to remove the steel strip while cutting the old coil head. The PLC high-speed counting unit always counts the pulses generated by the photoelectric encoder. When counting to the preset value, the anti-adhesive rubber roller starts to operate, as shown in Figure 1, when the B' point of the anti-adhesive rubber roller and the docking roller When point B coincides, that is, LDB=LD'B', the joint of the new and old rolls just reaches point D, then when the joints reach point B, the D' point of the anti-adhesive roller just reaches point B, according to the ideal design. In this state, the anti-adhesive tape should be just pasted to the seam of the new and old reel heads, and the docking action will be successfully completed.
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