Paper machine and drying cylinder thereof

Abstract

The invention discloses a drying cylinder. The drying cylinder comprises a cylinder body and flanges located at the two axial sides of the cylinder body and used for installing spindle noses, the cylinder body is a steel cylinder body, an interlayer is arranged at the circumferential inner side of the cylinder body and used for storing conduction oil with the heat-resistance temperature equal to or higher than 300 DEG C, and heaters used for heating the conduction oil are placed on the interlayer. As the steel cylinder body is adopted, the wall thickness and dead weight of the steel cylinder body are reduced compared with a cast iron cylinder body in the prior art, the transmission power of the drying cylinder is reduced, the heat transfer efficiency is improved, and energy is saved; the surface of the steel cylinder body is sprayed with chromium-based alloy and nitrided to prolong the service life. In addition, as the interlayer is additionally arranged on the drying cylinder and filled with the conduction oil with the heat-resistance temperature equal to or higher than 300 DEG C, and the heaters are used for heating the conduction oil, the temperature of the drying cylinder can be kept constant within the range of 240 DEG C-260 DEG C, wet paper is dried more easily, and the production efficiency is effectively improved. The invention further discloses a paper machine comprising the drying cylinder.

Description

technical field [0001] The invention relates to the field of papermaking, in particular to a drying cylinder. Furthermore, the present invention also relates to a paper machine comprising the above-mentioned drying cylinder. Background technique [0002] In the field of papermaking, the number of drying cylinders accounts for about 2 / 3 of the total number of pressure vessels in the papermaking industry. The function of the drying cylinders is to dry the moisture in the paper sheets and arrange the decorative paper surface. Therefore, the use effect of the drying cylinders has great influence on the quality of the products. plays an important role. [0003] In the existing technology, such as figure 1 and figure 2 As shown, especially for a high-speed toilet paper machine (above 700m / min), the drying cylinder includes a shaft head 101, a flange 102, an end cover 103, a cast iron cylinder body 104, a drainage system 105, and a support pipe 106; the shaft head 101 is locate...

AI Technical Summary

Problems solved by technology

[0004] Because the drying cylinder in the prior art is made of cast iron, the cast iron itself has defects, so it cannot be processed into a thinner size, resulting in the following disadvantages of the cast iron drying cylinder:

[0006] The wall thickness of the cast iron dryer is too thick, the heat transfer efficiency is low, and the steam consumption is high;

[0007] Cast iron dryers have casting defects and potential safety hazards. As the service life increases, they need to be operated at reduced pressure;

[0008] Cast iron surface hardness HV190, low hardness, short service life;

[0009] The drying cylinder is heated by boiler steam, and the temperature of steam heating is between 160°C and 180°C, which cannot reach a higher temperature, resulting in low production efficiency of the drying cylinder and environmental protection problems

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