JP5453767B2 - Replacement method of horizontal line tank for steel plate - Google Patents

Description

  The present invention relates to a method for replacing an existing horizontal line tank installed in a steel plate production line.

  In the steel plate production line, a tank (line tank) for performing surface cleaning and surface treatment of the steel plate while passing the steel plate is installed (see, for example, Patent Document 1).

  The line tank has a substantially rectangular parallelepiped shape. The horizontal line tank is longer than the height in the longitudinal direction (line traveling direction), and the vertical line tank is longer than the length in the line traveling direction. There is a horizontal line tank here.

  FIG. 3 is a perspective view showing a general horizontal line tank. As shown in FIG. 3, the horizontal line tank 10 includes an iron skin 11 and a brick 12 lining on the inner surface of the iron skin 11. The horizontal line tank 10 is, for example, a huge heavy object having a width of 5 m, a length of 20 m, and a weight of 50 tons. The horizontal line tank 10 is filled with a chemical solution such as acid or alkali for performing surface cleaning or surface treatment of the steel sheet.

And when the horizontal line tank, which is such a heavy load, becomes obsolete and needs to be replaced with a new horizontal line tank, it has been replaced by the following procedures (1) to (4). It was.
(1) First, dismantle and remove the existing horizontal line tank.
(2) Next, as shown in the perspective view of FIG. 4 (a), the iron skin 11 is divided into handleable iron skins 11a (here, three divisions), and the divided iron skins 11a are sequentially manufactured. Install on line.
(3) Next, the divided iron skin 11a is integrated by welding to produce the iron skin 11.
(4) Then, as shown in the cross-sectional view of FIG.
JP 2008-214716 A

  However, in the conventional method for replacing a horizontal line tank as described above, work on the production line such as integrated welding of divided iron skins and brick lining work requires a lot of time, so that the production line is extended for a long time. It was necessary to stop, reducing the production efficiency.

  The present invention has been made in view of the above circumstances, and provides a method for replacing a horizontal line tank for a steel plate that can replace an existing horizontal line tank installed in a steel plate production line in a short period of time. It is intended to provide.

  In order to solve the above problems, the present invention has the following features.

[1] A method for replacing an existing horizontal line tank installed in a steel sheet production line, wherein the newly produced horizontal line tank is arranged at a position outside the production line side by side with the existing horizontal line tank, after removing the horizontal line tank of existing, the towing direction of the production line the horizontal line tank newly remain integral, and be installed in a predetermined position on the production line, the horizontal line tank the newly When pulling in the direction of the production line as it is, the first endless roller for moving heavy objects and the second weight are respectively located on the lower side of the newly installed horizontal line tank and on the side far from the production line. Multiple sets of endless rollers for moving objects are installed, and multiple rails are installed from the position outside the production line of the newly installed horizontal line tank to the position on the production line. The first heavy load moving endless roller and the second heavy load moving endless roller are guided to the rail on the most upstream side of the production line and the rail on the most downstream side of the production line among the plurality of rails. The first wire is connected to the first heavy-duty moving endless roller, and the new horizontal line tank is installed at a position opposite to the position outside the production line across the production line. The first wire is wound up by a first winch fixed by a first anchor, whereby a new horizontal line tank is pulled in the direction of the production line, and the first heavy load is moved on the rail. The endless roller and the second endless roller for moving heavy objects allow the newly installed horizontal line tank to move toward the installation position on the production line. The second wire is connected to the second endless roller for moving heavy objects, and is fixed by a second anchor installed at a position opposite to the production line across the position of the newly installed horizontal line tank outside the production line. By holding the second wire by the second winch, the first weight moving endless roller and the second weight moving endless roller are prevented from running away. Replacement method for horizontal line tanks for steel sheets.

[ 2 ] The ratio of the maximum deflection δmax of the newly installed horizontal line tank to the length L in the longitudinal direction of the newly installed horizontal line tank when the newly installed horizontal line tank is pulled in the direction of the production line while being integrated δmax / L Is pulled to be 1/1000 or less. The method for replacing a horizontal line tank for steel plates according to the above [1 ] .

[ 3 ] When pulling the newly installed horizontal line tank in the width direction of the production line while keeping it as one body, the towing action points are set to three or more points, and the movement amount of the newly installed horizontal line tank between each of the action points is adjusted. The method for replacing a horizontal line tank for steel plates according to the above [1] or [ 2], wherein the difference is 10 mm or less.

  In the present invention, the existing horizontal line tank installed in the steel sheet production line can be replaced in a short period of time.

  Embodiments of the present invention will be described with reference to the drawings.

  1 and 2 are views showing a method for replacing a horizontal line tank for steel plates according to an embodiment of the present invention, FIG. 1 is a front view (viewed from the line traveling direction), and FIG. 2 is a plan view. It is.

  As shown in FIGS. 1 and 2, in this embodiment, when replacing an existing horizontal line tank installed in a steel sheet production line, the newly produced horizontal line tank 10 is arranged side by side with the existing horizontal line tank. Placed outside the production line (off-line), removed the existing horizontal line tank, then pulled the new horizontal line tank 10 in the direction of the production line as a single unit, on the production line (online) It is installed at a predetermined position.

At that time, endless rollers (circulation type table rollers) 22a and 22b for moving heavy objects are attached to the lower part of the newly installed horizontal line tank 10, and the newly created horizontal line tank 10 is online from the offline position. The predetermined number of rails 21 (seven in FIG. 2) are laid to the installation position. Then, the wire 23 is connected to endless rollers 22a for moving heavy objects at predetermined places (three places in FIG. 2), and the wire 23 is wound up by a winch (manual winch) 24 fixed by an anchor 25, thereby newly installing a horizontal line tank. 10 is pulled in the direction of the production line. Thereby, the horizontal line tank 10 newly installed on the rail 21 by the endless rollers 22a and 22b for moving heavy objects moves toward the installation position on the production line.

Here, a guide for guiding the heavy load moving endless rollers 22a and 22b , that is, a guide guide (not shown) is attached to the rail on the most upstream side of the line and the rail on the most downstream side of the line. Further, the wire 26 is connected to the heavy-weight moving endless roller 22b, and the wire 26 is held by the winch 27 fixed by the anchor 28, thereby preventing the heavy-weight moving endless rollers 22a and 22b from running away. .

  Then, as described above, when the wire 23 is connected to a predetermined location (traction point) of the newly installed horizontal line tank 10 and pulled in the direction of the production line, the towed horizontal line tank 10 is bent and the internal There is a concern that an unnecessary load acts on the brick 12 and damage such as crushing of the brick 12 or destruction of joints occurs.

  Therefore, structural analysis of the horizontal line tank 10 by the finite element method, durability test of the brick 12 and the like are performed, and from the result, when the newly installed horizontal line tank 10 is pulled in the direction of the production line, the length of the horizontal line tank 10 is increased. It has been found that if the ratio δmax / L of the maximum deflection amount δmax of the horizontal line tank 10 to the direction length L is 1/1000 or less, the brick 12 can be prevented from being damaged. For example, if the length L of the horizontal line tank 10 is 10 m (10000 mm), the maximum deflection amount δmax may be set to 10 mm or less.

  Therefore, in this embodiment, when the newly installed horizontal line tank 10 is pulled in the direction of the production line, the ratio δmax / L between the maximum deflection amount δmax and the length L of the horizontal line tank 10 is 1/1000 or less. As described above, the horizontal line tank 10 is reinforced by ribs or the like to improve rigidity, or the number of traction action points (three or more) and the positions of the horizontal line tank 10 are appropriately selected.

  Further, when the horizontal line tank 10 to be newly installed is towed in the direction of the production line, as shown in FIG. 2, scales 21a are attached to the rails 21 at the towing action points (three places in FIG. 2), The amount of movement of the horizontal line tank 10 at each traction action point is measured and confirmed with the scale 21a so that the difference in movement amount between the traction action points is 10 mm or less.

  Thus, in this embodiment, when replacing the existing horizontal line tank, the newly created horizontal line tank 10 is arranged at a position outside the production line (off-line) side by side with the existing horizontal line tank. After the horizontal line tank is removed, the newly installed horizontal line tank 10 is pulled in the direction of the production line as it is and is installed at a predetermined position on the production line (online). There is no need for work that requires a lot of time on the production line, such as integrated welding of divided iron skins and brick lining construction, such as the method of replacing the line tank. The existing horizontal line tank can be replaced.

  For example, by applying this embodiment, it was possible to shorten the work period to about 65% in the replacement work of the line tank for pickling hot-rolled stainless steel sheets. In addition, in the replacement work for the two surface cleaning line tanks of the continuous annealing line, the construction period could be shortened to almost 50%.

It is a front view showing one embodiment of the present invention. It is a top view which shows one Embodiment of this invention. It is a perspective view which shows a horizontal type | mold tank. It is a figure which shows a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Horizontal type line tank 11 Iron skin 12 Brick 21 Rail 21a Scale 22a, 22b Endless roller 23 for heavy object movement 23 Wire 24 winch 25 Anchor 26 Wire 27 winch 28 Anchor

Claims (3)

This is a method for replacing the existing horizontal line tank installed in the steel plate production line, where the newly created horizontal line tank is placed outside the production line side by side with the existing horizontal line tank. After removing the line tank, the newly installed horizontal line tank is pulled in the direction of the production line while being integrated, and is installed at a predetermined position on the production line. in the time of pulling in the direction of the production line, for moving the first heavy moving endless roller and a second heavy each side and the far side in the production line close to the bottom of the production line of horizontal line tank new an endless roller with advance multiple sets fitted, laying a plurality of rails from positions outside the production line of the horizontal line tanks new to the installation position on the production line , The plurality of production lines the most upstream side of the rail and the production line downstream side of the rail of the rail, the guide for guiding the first heavy moving endless roller and the second heavy moving endless roller the attached, connecting the first wire to the first heavy moving endless roller, first installed in a position opposite to the position outside the production line of the horizontal line tank established across the production line 1 The first wire winch is wound up by a first winch fixed by an anchor of the first to pull a new horizontal line tank in the direction of the production line, and the first endless roller for moving a heavy object on the rail. together with the second heavy moving horizontal line tanks established by an endless roller is to move toward the setting position on the production line and the second Connecting a second wire to the heavy moving endless roller, a second fixed in second anchor installed in a position opposite to the production line while sandwiching the arrangement position outside the production line of the horizontal line tank new By holding the second wire by a winch , it is possible to prevent the first weight moving endless roller and the second weight moving endless roller from running away. Replacement method for horizontal line tank for steel plate.   When the newly installed horizontal line tank is pulled in the direction of the production line while being integrated, the ratio δmax / L of the maximum deflection amount δmax of the newly installed horizontal line tank to the longitudinal length L of the newly installed horizontal line tank is 1 / The method for replacing a horizontal line tank for steel plates according to claim 1, wherein the tow is pulled to 1000 or less.   When pulling the newly installed horizontal line tank in the width direction of the production line as a single unit, there are three or more operating points to be pulled, and the difference in the amount of movement of the newly installed horizontal line tank is 10 mm between each of the operating points. It pulls so that it may become the following, The replacement | exchange method of the horizontal line tank for steel plates of Claim 1 or 2 characterized by the above-mentioned.

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