KR810001059B1 - Manufacture of paper machine dryer - Google Patents

Abstract

Method and apparatus for manufacturing paper machine dryer with simple process, light weight and effective capacity is described. The paper machine dryer is composed of exterior drum(1), interior drum(1), stay(3), steam ejection-pipe(4), steam introduction-pipe(5), axis(6), manhole(7), aiabatic material(8), and space(9, 11,12).

Description

Drying drum manufacturing method of paper machine dryer

1 is a cross-sectional view of the present invention.

2 is a sectional view taken along the line A-A of FIG.

3 is a drying drum of a conventional paper machine dryer.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a papermaking drum manufacturing method for paper machine, wherein the outer shell and the inner shell are formed of an iron plate or a steel plate, and a steam introduction pipe is used. And it is a manufacturing method of papermaking drying drum with simple process, light weight, and excellent performance, which is made by welding the side hard plate and the like integrally.

Originally, a drying drum is to cast a cylinder, and to attach a supply port of steam as a heat source and an auxiliary tool for removing condensate in the cylinder. It takes a considerable time to increase the pressure to commercial pressure after the steam is introduced, and the rotation speed is low. When casting, sand holes are formed in the body to be cast in consideration of leakage of steam and danger of explosion. Care should be taken to prevent the formation of the cylinder. The surface of the cast cylinder is quenched again, the surface is carefully cut, polished smoothly, and polished. Cutting is necessary to make the thickness constant, and it requires a skilled technique, and the manufacturing process is not only complicated, but also the back unevenness, sand hole, bubble Due to the raw material, defective products appeared in the casting company, and the high cost of the manufacturing cost was inevitable, and the current function makes it difficult to enlarge the cylinder (the maximum diameter is difficult to exceed 3635 to 4000 mm). The lack of technology is hampering the development of the paper industry.

Moreover, as the cultural scale has increased due to the increase in population, it is urgently needed to innovate dry drums due to the increasing demand for paper drums, rapid rotation speed, and high thermal conductivity associated with increasing paper demand. After many years of sympathy, he finally escaped the casting method, which is an old method, and came to complete the present invention.

In producing a drying drum, the present invention forms an outer shell by using a steel plate or a steel plate of about 40 mm to 45 mm, and the inner corner of the concentric circle is made of a sheet material such as the outer shell inside the outer shell. To form a water vapor storage space, a stay is installed in the space, and the water vapor storage site and the part in contact with the outside air are insulated with heat insulation.

This will be described in detail with reference to the accompanying drawings.

The outer shell 1 and the inner shell 2 are formed in a cylindrical shape by welding using a rolled steel sheet having the thickness of 38 to 45 mm or the same iron plate to form a space for water vapor receiving, and between the inner and outer shells 2 and 1, The stay 3 made of) is rolled up, and the side wall portion is made of a steel plate or a face plate made of iron plate, and welds the inside and the outside after the outer shells 2 and 1 and the planar processing.

In the figure, 4 is a steam jet pipe, 5 is a steam inlet pipe installed in shaft 6, 7 is a manhole, and 8 is a heat insulating foreskin.

In view of the effect of the present invention, the stay 3 is a state in which the steel sheets of the outer shell 1 and the inner shell 2, which are caused when the water vapor is filled in the space 9 and the outer shell 1 is heated, are stress-deformed in a wave shape. In order to prevent a closed end, and when the diameter of a drum is 3636 mm, it is suitable to use 12 steel plates (STPT 38) generally.

The water vapor is ejected into the space 9 in the case of the water vapor introduction tube 5 through the shaft 6 and the outer shell 1 is between the inner cabinet 2, thereby rapidly heating and evaporating off the moisture contained in the wetland on the outer shell 1 surface.

According to the present invention, the water vapor is introduced into the entire casting casting drum body of the related art by introducing water vapor into only the space 9 between the inner and outer shells 2 and 1, and the amount of the supplied steam is much smaller. The temperature rise and fall to the temperature is rapid, and the pressure of the steam applied in the space 9 can also be much higher than that of the conventional one.

Adjust the contraction pressure inside the drying barrel by drilling a hole of approximately 6øm / m on both sides of the stay STPT38.

According to the actual experiment, in the case of introducing water vapor into the entire conventional drying drum, the maximum working pressure is only 3 to 5 kg / cm 2 (hydraulic test pressure is 10 kg / cm 2), but in the present invention, the working pressure (常用 常 力) ) Up to 10kg / ㎠ (Hydraulic test pressure 20kg / ㎠), as shown in the following two comparison table, the thermal reduction rate is 11.3% higher than the steel sheet dry, the thermal efficiency is 37.9% of cast iron dryer, steel sheet The dryer is superior, so that a small amount of high pressure steam can improve the working efficiency, and thus, the advantages of both the cost and production efficiency are convinced.

TABLE 1

(Measurement result from the Central Thermal Research Institute, a designated agency of the Ministry of Power and Resources)

TABLE 2

In the practice of the present invention, the discharge of condensed water can be arbitrarily selected according to the conventional method, whether it is a siphon type or a baguette type, and other basic systems such as pressure gauge safety valves and auxiliary tools can be used for conventional casting. use.

The outside of the cabinet 2, the water vapor introduction pipe 5, and the part in contact with the outside atmosphere of the water vapor receiving portion, etc., are insulated by heat insulating material such as asbestos glass wool to keep warm.

The present invention is produced by welding the sheet metal as compared with the drying drum by the casting of the past, there is no occurrence of defective products, the working period can be shortened, and lightweight, homogeneous, cutting and polishing work is required There is no manufacturing cost and no risk. In addition, since the product is a thin plate with a homogeneous outer shell, unlike the casting, the conduction of steam heat is rapidly uniform and the vapor receiving space is narrowed, the steam consumption can be reduced by at least 1 / 4-1 / 5. In addition, the use of relatively high pressure (7 ~ 10kg / ㎠) and the drying speed is fast, the consumer can be protected by cost reduction due to the improvement of production efficiency.

The drying drum according to the present invention can be used for drying products in a wide range of industries, such as paper, cardboard and textiles, as well as other continuous sheets or pastes such as food and pigments. Has the effect.

Claims (1)

Using a steel plate or a steel plate, the outer shell is made by welding, and an inner concentric circle is formed inside the outer shell in the same manner as the outer shell to form a water vapor receiving space, and a stay is again installed in the same space. Drying drum manufacturing method of a paper machine dryer, characterized in that the insulation of the foreskin to all parts in contact with the receiving part and the outside air.

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