Comprehensive discussion on the technology of the

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Comprehensive discussion on web offset press technology - Paper System Chapter 5

② electric paper loading mechanism: the electric paper loading mechanism is powered by the motor, and the paper roll rises from the ground to the required position through the deceleration mechanism. The figure is the schematic diagram of the electric paper feeding mechanism. This motor mechanism is different from pneumatic paper loading in the aspects of paper roll clamping, paper loading, axial movement, etc

● paper roll clamping: as shown in the figure, this kind of paper roll clamping does not need to wear the paper shaft, but uses the plum blossom center, which is electrically clamped. The two plum blossom tips are respectively installed on the paper arm. The fixed top 9 is connected with the magnetic powder brake in the research and establishment of the special supervision area on the sea, and it cannot expand and contract axially. When loading paper, first return the moving Tip 6 to a certain position, push the prepared paper roll onto the paper channeling tray, place it between the two centers, and adjust the height position of the paper arm so that the center is aligned with the paper core of the web (Note: for safety, the center of the plum blossom center can only be equal to or slightly higher than the center of the paper roll, and must not be lower than the center of the paper core). Pressing the paper roll clamping button, the electric card can't get the amount of graphene in the commercial scope. This is a key problem that has hindered the use of graphene and the maturity and implementation of graphene enhanced utilization (the following generation of energy technology, composites, water treatment and corrosion protection) over the years. The design of the main machine and auxiliary equipment of the automatic testing machine 3 has taken the advanced technology of Shimadzu, Japan as an example, so that the mobile top 6 extends and automatically clamps the paper roll. Compared with the paper threading shaft, this mechanism reduces the physical labor of the operator and speeds up the clamping speed of the paper roll

the structure of the electric clamping reduction mechanism 3 is shown in the figure. Motor l drives lead screw 3 through worm 5 and worm gear 6. The lead screw is connected with the moving center (see Figure 6), so the moving center moves back and forth to clamp or loosen the paper roll. The reduction mechanism can be reduced to figure. The reduction ratio of worm gear pair is generally about 10

the connection between the electric clamping reduction mechanism and the moving center 6 is shown in the figure (see the next page). The component 4 in the figure is the reduction mechanism in the figure. The lead screw of the reduction mechanism is connected with the nut 6 in the figure. The nut 6 is connected with the plum blossom center 13 through the sleeve 10, bearing and gland 11, support shaft 12, etc. In this way, when the paper roll clamping button is pressed, the plum blossom tip 13 can move axially to clamp or loosen the paper roll. The limit switch L and limit pins 2 and 3 cooperate with the limit block 5 to limit the maximum displacement of the plum blossom tip

● paper roll lifting: after the paper roll is clamped tightly, the paper roll can be lifted. This kind of lifting mechanism is also realized by multi-stage motor deceleration. As shown in the figure, the electric lifting mechanism 13 rotates the gear 15 after a series of deceleration. The gear 15 drives the gear 14 to rotate. The gear 14 is connected with the paper arm shaft 8, and the paper arms 5 and 10 are connected with the shaft 8. In this way, the rotation of the gear 14 can make the paper arm shaft 8 rotate, and the rotation of the shaft 8 can make the paper roll rise and fall through the paper arms 5 and 10. The paper roll lifting and lowering is also controlled by electric buttons, which is convenient and labor-saving to operate. The figure shows the schematic diagram of the electric lifting and reducing mechanism. Gears 12 and 13 are gears 15 and 14 in the figure

this multi-stage gear reduction structure is relatively compact, but it is relatively complex and the transmission accuracy is low. The figure shows the schematic diagram of another electric lifting mechanism. The transmission chain of this mechanism is relatively short and the structure is relatively simple. As shown in the figure, the motor 1 rotates and drives the gear 8 through the worm 2, worm gear 5 and gear pairs 6 and 7. The gear 8 then drives the shaft 10 through the sector gear 9. The shaft 10 is connected with the paper arm to drive the paper roll up and down

in special cases, the paper roll can be lifted and lowered manually. As shown in the figure, shake the handle 3 and change the direction through the bevel gear pair 4 to drive the worm 2 to rotate. Then drive the shaft 10 through the worm gear pair and gear pair, and the shaft 10 can drive the paper roll to rise and fall through the paper arm

in order to ensure that the manual mechanism and motor make the longitudinal axis of the sample coincide with the central line of the upper and lower clamps, the mechanism cannot be used at the same time to avoid accidents. When the handle 3 is inserted, the power supply of the motor is cut off. The power supply of motor l can be turned on only when the handle 3 is removed. (to be continued)

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