Conveyor belt drive and its innovation of the hott

Conveyor belt drive and its innovation of ribbon type plate printing machine

in the printing industry, there are many chromatic printing businesses of soft and elastic materials such as colored webbing, trademark belt, cotton belt, rubber band, etc. Its Characteristics of easy expansion and deformation and poor positioning are the biggest difficulties of chromatic printing, and it is also the primary problem that printing equipment needs to solve. To this end, some printing machinery and equipment manufacturers have launched a ribbon version chromatic printing machine

the maintenance and protection of the steel bar zigzag testing machine for the popularization of the knowledge of the roll belt type gold testing machine. The printing machine consists of four parts: feeding, printing, drying and winding. Its working principle is: apply a layer of self-adhesive on the conveyor belt with good tensile strength and no telescopic deformation, paste the printing material (webbing) on the surface of the conveyor belt, move with the conveyor belt, and after many times of printing and drying, separate and roll from the surface of the conveyor belt to complete multi-color printing

Figure 1 is a schematic diagram of the working principle of the reel type plate printing machine. On a long conveyor belt, multiple sets of silk plates and scraping knives can be set according to the number of colors to be printed. There is only one set of plate scraping knives in the figure, which is only for schematic explanation. The conveyor belt is generally made of 0.5mm thick polypropylene plastic sheet, which is light in weight and high in tensile strength. Keeping the constant tension of the conveyor belt is a key to realize the positioning of soft elastic materials for chromatic printing. For this reason, the conveyor belt is generally driven by double lifting rollers, as shown in Figure 2. The conveyor belt passes through the positioning cylinder, driving cylinder, front lifting roller, pressing roller, rotating roller and rear lifting roller in turn. The weight of the front and rear lifting rollers is equal, and the conveyor belt always maintains a certain tension under the gravity of the front and rear lifting rollers. At the beginning, the front lifting roller is at the top and the rear lifting roller is at the bottom; During printing, the positioning cylinder presses the conveyor belt and does not move; After completing a printing, the positioning cylinder looses the conveyor belt, the clamping cylinder clamps the conveyor belt, and the driving cylinder moves forward a distance. The positioning cylinder presses the conveyor belt again. The plastic granulator operation touches a wide range of areas for printing in new positions; After printing several times in this way, the front lifting roller drops to the lowest position and the rear lifting roller rises to the highest position. At this time, the rotating roller starts to pull the conveyor belt hanging from the front backward, the front lifting roller starts to rise, the rear lifting roller starts to fall, and after falling to the lowest position, the rotating roller stops

in the system of driving the conveyor belt with double hanging rollers, there must be a rotating roller and a pressing roller. The pressing roller presses the conveyor belt on the rotating roller and drives the conveyor belt through friction. The rotating roller is driven by the motor, and the start and stop of the motor are controlled by the proximity switch

the width of the conveyor belt is 200 ~ 400mm. In the width direction, if the pressing force at both ends of the pressing roller is not equal, the conveyor belt is easy to deviate during operation. If the pressing force is too large, the conveyor belt will be pressed out of the scar. Therefore, the pressing force of the pressing roller must be carefully adjusted to keep it uniform and appropriate in the width direction of the conveyor belt, which is the inconvenience and defect of the double hanging roller drive mode

the principle of single hanging roller drive is shown in Figure 3. The conveyor belt passes through the positioning cylinder, clamping cylinder, front lifting roller, rear fixed roller, etc. The main difference between it and the double lifting roller type is that the rotating roller and the pressing roller are eliminated, and the rear lifting roller is replaced by a fixed roller. The whole conveyor belt is tensioned by the gravity of a lifting roller to maintain a constant tension. Every time the machine prints, the driving cylinder will drag the conveyor belt forward a distance, and the front lifting roller will always remain at the same height

compared with the double hanging roller drive of similar models in the same industry, the single hanging roller drive mode of dspa-2532 model has a simplified structure, saves the tension adjustment process, and the conveyor belt will not deviate during operation, with high chromatic printing accuracy, low power consumption and low noise

reprinted from: printing industry