JPS61140379A - Seam cleaning device of welded steel pipe - Google Patents

Abstract

PURPOSE:To reduce the cost in cleaning by providing a heating device to heat a seam part from the outer face of a pipe and by arranging a reflection body for heating the inner face of the pipe. CONSTITUTION:A heating furnace 10 is installed on the center part of a sliding frame 2 to ascend and descend via a cylinder 3. A burner 13a together with a combustion chamber 13 is arranged on the upper end part of the furnace 10. An opening part 12 which is along the seam part is provided on the lower end part of the furnace 10 and also a reflection body 16 is suspended via a hanger 17. When a blank pipe is transferred, the burner 13a is ignited with detecting it by a proximity sensor and burnt. Consequently the seam part of the blank pipe 7 is heated by the radiated heat from the inside of the furnace through the opening part 12 and also heated by the reflected heat of the reflection body 16. With this method the seam part of the blank pipe 7 is effectively cleaned and the cleaning cost can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a seam cleaning device for welded steel pipes.

Conventional methods for removing slag, etc. from the seam groove generated during the forming process of UOE welded steel pipes include cleaning with high-pressure water and then drying the seam groove, or heating the seam groove in an induction heating furnace. It is removed by heating (using electricity).

However, the former requires large-scale water treatment equipment and pipe drying equipment, especially water treatment equipment (in the second case, there is a problem of pollution and the need for circulation, which incurs a huge equipment cost,
Running costs are also high. On the other hand, induction heating furnaces also require high electrical equipment costs and are not very effective.

SUMMARY OF THE INVENTION An object of the present invention is to provide a seam cleaning device that is low cost and effective in cleaning seams.

The seam cleaning device for welded steel pipes of the present invention includes a heating furnace having an opening along the bottom surface of the seam portion for heating the seam portion from the outside surface of the pipe, and a reflector for heating the inner surface of the seam portion suspended from the heating furnace. It is equipped with the following.

An embodiment of the present invention will be described below with reference to the drawings. 1 in the diagram
is a column, and a slide frame 2 is attached between the columns 1 and 1 so as to be movable up and down.

The slide frame 2 is vertically moved by a cylinder 3 via a bracket 4. At both ends of the slide frame 2, there are seam guide roll boxes 5 with a seam guide roll 6 pivotally supported at the lower end. A heating furnace 10 is attached to the center of the slide frame 2 via a plaque. The heating furnace 10 has a rectangular cross section and is lined with a refractory 11, and has an opening 12 along the seam (2) at the lower end.A combustion chamber 13 is formed at the upper center edge of the heating furnace 10. A burner 13a is provided above it.This burner 13a (second is a fuel such as LPG) is connected to an IFZ4 and a combustion air pipe 15. It is possible to adjust low-calorie combustion and high-calorie combustion. 17 is a reflector made of refractory material that reflects radiant heat from the opening 12 of the heating furnace and heats the seam part from the inside of the tube. Heating furnace 1
A heat insulating plate 18 extends from the side surface of 0 for effective use of heat. Also, heating furnace 10 (:ha, nokuirotsu)
i4-S 19 and UltraVision as an ignition detector 2θ are provided. and pilot burner 19
The fire is kept lit at all times, and if the fire goes out, the ignition detector 20 will issue an alarm. In addition, a proximity sensor (not shown) is attached to the seam guide roll box 5 (2) to detect the tip of the raw pipe 7 when it is transported by the transport row 2 (not shown) or the like. At the same time when the two-nazu ignites, gas and combustion air are fed into it and it combusts.

Therefore, the seam part of the raw pipe 7 that is being transported is heated to the heating furnace 1.
Before and after 0 (= arranged seam guide whirl 6 (2) at an appropriate interval (= in the open state).

Through the opening 12 of the heating furnace along the seam part from the outside surface, the radiant heat from inside the furnace and the flame (2) are heated directly, while the seam part is also heated from the inside surface by the reflected heat from the reflector 17, and the seam part is heated effectively. The seam area is cleaned.

Then, for the raw pipe 7' (2 pairs) having a small diameter, the cylinder 3 is operated and the heating furnace 10 and the seam guide roll 6 are connected to the heating furnace 10 and the seam guide roll 6 through the slide frame 2, as shown in imaginary lines.
Lower it and perform cleaning work.

Note that if the scale at the seam cannot be completely removed by the above-mentioned device alone, such as when the raw pipe 7 has a large friction and a large diameter, the heating furnace 10 and the rear seam guide call box 5 are used. Between this roll box 5C and the oxygen flame spray device 30 is installed.

The water-cooled Panapa ζx 32 is arranged facing each other with the seam in between, and each water-cooled ♂x 32 (; is 4 burners 31 are arranged in a staggered pattern as shown in Fig. 5, and the upper and lower individual - The burners are arranged so that they do not face each other. Each burner 31 (= is connected to a gas pipe 34 such as LPG and a distribution pipe 33.

Then, the mixture of gas and oxygen is combusted to further heat the seam groove, and the oxygen jet blows off scale and the like. This makes it possible to completely clean the seam of any raw pipe.

The seam cleaning device of the present invention is as described above, and can effectively clean seams at a lower cost than conventional methods.

[Brief explanation of the drawing]

Figures 1 and 2 are front and side views showing one embodiment of the apparatus of the present invention, Figures 3 and 4 are front and side views of the apparatus for oxygen flame spraying, and Figure 5 is the burner arrangement. FIG. 10... Heating furnace, 12... Opening, 16... Reflector. 30...Oxygen flame spraying equipment. Applicant's agent Patent attorney Takehiko Suzue Figure 3 0f Figure 5 Figure 4

Claims (1)

[Claims] A seam cleaning device for welded steel pipes, comprising a heating furnace having an opening along the seam in the bottom for heating the seam from the outside surface of the pipe, and a reflector for heating the inner surface of the seam suspended from the heating furnace. .