SU606061A1 - Device for drying coatings on pipes - Google Patents

Description

The invention relates to a technique of drying products after coating with an anticorrosive composition and can be used when drying on a conveyor a pipe that has been painted on the outside.

Installations for drying coatings on pipes are known, comprising a drying chamber, a ventilation system with injection and suction air ducts, and a conveying device for moving the pipes 1.

These plants are the closest to the invention in technical terms, ensure the transfer of heat from the inside through the heated wall to the floor and allow the thicker coating to be dried (0.6 ... 1.5 mm when creating certain technological modes of hot gas supply and exhaust evaporating solvent vapors. Such installations are rationally used for pipes and tubular products with a length equal to no more than two diameters and having holes on the lateral cylindrical surface along the axis of symmetry. Heating of the entire surface. With increasing length, the heating uniformity is disturbed, the drying speed drops, and in places of later drying a surface film inevitably appears until the dye layer is completely dry. In addition, in these installations the surface is not heated effectively direct contact of the gas flow with the pipe walls.

The aim of the invention is to intensify the drying process of pipes of almost any length.

This is achieved by the fact that the ventilation system is made in two sections with the location in each section of the injection and suction ducts from opposite ends of the pipes, and the adjacent ducts in adjacent sections are placed on opposite sides.

In addition, the discharge air ducts at the outlet are provided with slotted nozzles.

Such an installation provides, as a result of high-speed washing of the surface of the pipes, rapid heating of the metal from the inside, which creates conditions for intensive evaporation of the solvent from the inner layers to the outer layers and suction of them with the same system. Creating a velocity flow of hot gas in the pipes and changing its direction to

sections ensures uniform heating and drying intensity throughout the length of the painted pipes.

FIG. 1 c} an installation is depicted in a schematic manner, the view of Cepxyj in FIG. 2 is the same, side view) in FIG. 3 is a view A of FIG. I.

The installation comprises a drying chamber 1 with a transporting device 2 (conveyor-type) placed therein for moving the colored pipes 3, a ventilation system forming two sections consisting of fans 4 and 5 with air coolers 6 and 7, discharge pipes 8 and 9, and suction air ducts

10 and 11, discharge air ducts

12 and 13 and the coating unit 14 on the outer surface of the pipes. Pressure air ducts 12 and 13 at the outlet and suction air ducts 10 and

11 are equipped with slit nozzles 15 and 16 for circulations. Gas flow through pipes 3. In each section, the discharge and suction ducts are located at opposite ends of the pipes,

and in the adjacent sections of the same name, vozdu-, ghost parks are located opposite. parties.

The installation works image.

From the coating unit 14 on the outer surface of the pipes, the regional pipes 3 to the conveyor 2 are continuously transported through both sections of the main chamber 1. Through the air ducts f2 and

13 and slot F4 nozzles etenile torvmi

4 and 5, through the heaters 6 and 7, the flow of hot gas flows to the pipes 3, with the main part of the hot gas going into the pipes and the rest being washed by: the outer surface of the pipes. Fans 4 and 5 through the air ducts 10 and 11 from the opposite ends of the pipes 3 suck off the spent

the heat carrier and its partial emission into the atmosphere through the discharge pipes 8 and 9, and the remaining part, mixed with fresh heat carrier,

5 through heaters 6 and 7 is fed back into the drying chamber. In the sections of chamber 1, the flow of hot gas has the opposite direction.

The installation allows to intensify the drying process and increase the output of the pipes as a result of the continuous flow of the pipes by the conveyor. The economic efficiency of using this device in one plant with a program of producing 750 km of pipes per year will be approximately 200 thousand rubles.

Claims (2)

1. Installation for drying coatings on pipes, containing a drying chamber, a ventilation system with injection and suction air systems and a transporting device for moving pipes, which, in order to intensify the drying process, is a ventilation system: the system is made in two sections 30 located in each section of the injection and suction ducts from opposite ends of the pipes, and in the mixing sections of the same pipes are located from opposite 3 side - 2.-Installation pop. 1, different from the fact that the discharge air ducts at the outlet are provided with a slit staim slot. 40: Sources of information taken during the examination of npif: 1. USSR author's certificate. 1 58532, class V 26 V 21/02, 1963. No VI9A sixteen