JP2012012690A - Connection structure of converter bottom - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connection structure of the bottom of a converter that enables easy and rapid fastening work of the bottom and has a small number of components.SOLUTION: This connection structure of the bottom of the converter is a connection structure between a body section 3 of the converter and an exchangeable bottom section 5. The connection structure includes an outer ring member 7 whose lower end side extends below the body section 3 and upper end side is turnably attached to an opening peripheral edge of the body section 3, and a bottom flange section 9 that is disposed in the bottom section 5 and abuts on the opening peripheral edge of the body section 3. The outer ring member 7 has projection pieces 19 projecting inward on its lower end side at a predetermined interval of the circumferential direction. The bottom flange section 9 has projecting pieces 21 projecting outward at a predetermined interval of the circumferential direction. By turning the outer ring member 7 in a state where a projecting piece 21 is arranged between adjacent projection pieces 19 of the outer ring member 7 in the planar view and the bottom flange section 9 is abutted on the opening peripheral edge of the body section 3, the projection pieces 19 of the outer ring member 7 abut on the projecting pieces 21 of the bottom flange section 9 so as to press up them and the bottom section 5 is connected to the body section 3.

Description

  The present invention relates to a converter furnace bottom connecting structure in which a main body and a bottom are separable and the bottom is replaceable.

  A furnace body of a metal refining furnace such as a steelmaking converter is formed by lining a refractory brick inside a metal skin generally called an iron skin. If the operation in the metal smelting furnace is continued, the refractory bricks will be worn out by the molten metal and the thickness of the lining will decrease, but if the thickness of the lining decreases, the heat insulation effect will be impaired, and the surface temperature of the iron skin will increase, Eventually, the furnace body will be damaged. Therefore, in order to maintain the thickness of the lining above a certain value, it is necessary to perform repairs when the refractory is reduced below a predetermined thickness.

11 and 12 are explanatory diagrams of a metal refining furnace such as a converter having a replaceable furnace bottom and a furnace bottom replacing apparatus described in Patent Document 1. FIG. First, the structure of a metal refining furnace having a replaceable furnace bottom will be described.
As shown in FIG. 11, the furnace body 51 includes a main body 53 having an open bottom and a replaceable furnace bottom 55 that can be installed in the opening of the main body 53. A flange 57 is provided at the peripheral edge of the opening of the main body 53, and a flange 59 is also provided at the peripheral edge of the furnace bottom 55. The flanges are joined to each other by bolts (not shown) with the furnace bottom 55 installed in the opening.

By making the furnace bottom 55 replaceable as described above, a furnace bottom 55 equipped with a new refractory is separately prepared during operation in the furnace body 51, and the furnace bottom of the furnace body 51 in operation is prepared. If damage to the refractory 55 increases, it can be replaced.
A furnace bottom exchanging device 61 for exchanging the furnace bottom 55 includes a furnace bottom placing table 63 on which the furnace bottom 55 is placed, a support table 65 that supports the furnace bottom placing table 63, and a lifting device 67 that raises and lowers the support table 65. And a traveling carriage 69.

  An outline of the method for replacing the furnace bottom 55 is as follows. The furnace bottom 55 to be replaced is supported by raising the furnace bottom mounting base 63, and the bolts connecting the flange portions 57 and 59 are removed in this state. Then, the furnace bottom placing table 63 is lowered and moved to the restoration factory for the furnace bottom 55 that has traveled and removed the traveling carriage 69. On the other hand, the separately prepared furnace bottom 55 is placed on the furnace bottom placing table 63, and the traveling carriage 69 is moved below the main body 53 of the furnace body 51. Then, the lifting device 67 is raised and the furnace bottom 55 is inserted into the opening of the main body 53. Then, the flange portions 57 and 59 are joined together to perform bolt joining.

Japanese Patent No. 2995039

  As described above, the conventional connection structure between the main body and the replaceable furnace bottom is a structure in which the furnace bottom and the main body are fastened and connected with bolts. The bolts used for fastening depend on the size of the furnace, but generally about 40 bolts of about M72 are used. For this reason, including torque management by removing and attaching bolts, and measuring the tightening torque after tightening bolts, it takes about 2 hours to work simultaneously from 4 locations, and this reduces the operating time. There is.

  Further, since the bottom of a metal smelting furnace such as a converter is greatly deformed due to the influence of heat or the like, it is usual that a bolt hole for fastening a bolt has a margin. For this reason, there is a large gap between the bolt hole and the bolt, and it is necessary to use a wide and thick washer for the bolt joint, which causes a problem that the number of parts increases.

  SUMMARY OF THE INVENTION The present invention has been made to solve such problems, and an object of the present invention is to obtain a converter furnace bottom connection structure that can easily and quickly fasten the furnace bottom and has a small number of parts.

(1) The converter bottom connection structure according to the present invention is a connection structure between a converter main body and a replaceable furnace bottom, and the lower end extends downward from the main body, An outer ring member whose upper end side is rotatably attached to the opening peripheral part of the main body part, and a flange part provided on the furnace bottom part and abutting on the opening peripheral part of the main body part, the outer ring member comprising: Protruding piece portions projecting inwardly at the lower end side are provided at predetermined intervals in the circumferential direction, and the flange portion is provided with protruding piece portions protruding outward at predetermined intervals in the circumferential direction. The outer ring member is rotated by rotating the outer ring member in a state in which the convex piece part is disposed between the projecting piece parts adjacent to each other and the opening peripheral part of the main body part is in contact with the flange part. The protruding piece part of the front part is in contact with the protruding piece part of the flange part so as to push up. It is characterized in that the furnace bottom portion is configured to be coupled to the main body portion.

(2) Further, in the above-described (1), an inclined surface is formed on a contact surface of the protruding piece portion and the protruding piece portion, and the protruding piece portion is moved by rotating the outer ring member. The convex piece portion is pushed up.

(3) In the above (1) or (2), in the state where the outer ring member is rotated and the furnace bottom is connected to the main body, the outer ring member is opposite to the rotation direction. A stopper is provided to prevent rotation in the direction.

(4) Further, in the above (3), the stopper is provided with a turnbuckle.

In the present invention, projecting pieces projecting inwardly on the lower end side of the outer ring member provided on the main body side of the furnace body are provided at predetermined intervals in the circumferential direction, and projecting pieces projecting outward on the flange portion on the furnace bottom side Portions are provided at predetermined intervals in the circumferential direction, the convex piece portion is disposed between adjacent protruding piece portions of the outer ring member in plan view, and the flange portion is in contact with the end portion of the main body portion, By rotating the outer ring member, the projecting piece portion of the outer ring member comes into contact with the convex piece portion of the flange portion so as to push up, and the furnace bottom portion is connected to the main body portion. By operating, the furnace bottom can be connected to the main body and removed, and the working time can be greatly reduced.
In addition, even if a gap as an adjustment allowance is provided in the connecting portion assuming deformation due to heat, since the protruding piece part of the outer ring member pushes up the convex piece part on the furnace bottom side at the time of fastening, it is fastened. Fastening can be performed securely without using a separate member such as a washer that has been required in the past.

It is explanatory drawing of the principal part of the connection structure of a converter furnace bottom in one embodiment of this invention. It is explanatory drawing of the connection operation | movement of the connection structure of the converter furnace bottom in one embodiment of this invention, and is a figure which shows the state before connection. It is explanatory drawing of the connection operation | movement of the connection structure of the converter furnace bottom in one embodiment of this invention, and is a figure which shows the state after a connection. FIG. 4 is an enlarged view of a portion A surrounded by a circle in FIG. 3. It is explanatory drawing of the outer ring member in one embodiment of this invention. It is explanatory drawing of the furnace bottom flange part of the furnace bottom part in one embodiment of this invention. It is explanatory drawing of the connection operation | movement of the connection structure of the converter furnace bottom in one embodiment of this invention, and is a figure which shows the state before connection. It is sectional drawing which follows the arrow AA line of FIG. It is explanatory drawing of the connection operation | movement of the connection structure of the converter furnace bottom in one embodiment of this invention, and is a figure which shows the state after a connection. It is sectional drawing which follows the arrow BB line of FIG. It is explanatory drawing of a prior art example, and is a figure which shows the state before the connection of a furnace bottom part. It is explanatory drawing of a prior art example, and is a figure which shows the state after the connection of a furnace bottom part.

An embodiment of the present invention will be described in detail with reference to the drawings.
The converter furnace bottom connection structure according to the present embodiment is a connection structure between the main body 3 of the furnace body 1 and the replaceable furnace bottom 5, and the lower end side extends below the main body 3. At the same time, an outer ring member 7 whose upper end side is rotatably attached to the opening peripheral edge of the main body 3, and a furnace bottom flange 9 that is provided on the furnace bottom 5 and contacts the opening 11 of the main body 3. The main body part 3 and the furnace bottom part 5 are connected by rotating the outer ring member 7 and engaging the furnace bottom flange part 9 of the furnace bottom part 5 and the outer ring member 7.
Details will be described below.

<Main body>
The overall shape of the main body 3 is the same as the conventional one shown in FIGS. 11 and 12, and an opening 11 is provided at the lower end for installing the replaceable furnace bottom 5. A main body flange portion 13 is provided at the peripheral edge portion of the opening portion 11. The outer surface of the main body 3 is covered with an iron skin 15, and a refractory brick 17 is lined inside thereof.
The main body flange portion 13 is provided with an outer ring member 7 made of a ring-shaped member as shown in FIG.
The outer ring member 7 circulates around the opening 11 of the main body 3 and is rotatably attached to the main body flange 13. And the lower end side of the outer ring member 7 extends downward from the main body flange portion 13 (see FIGS. 1 and 2).

  1 to 3 are diagrams for explaining a main part of the present embodiment, and show a portion corresponding to a portion indicated by a broken-line circle in FIG. Moreover, in FIGS. 1-4, although the hatched part is attached | subjected to the site | part which shows the furnace bottom flange part 9, the outer ring member 7, and the main body flange part 13, this modifies the present furnace body and is the present embodiment. The purpose is to clarify a newly added site when forming a connection structure.

Further, as shown in FIG. 5, a plurality of projecting piece portions 19 projecting inward are provided on the lower end side of the outer ring member 7 at predetermined intervals in the circumferential direction. In the example shown in FIG. 5, for example, the number of the protruding piece portions 19 is four, but the number is not particularly limited. The protruding piece portion 19 can be inserted between the adjacent convex piece portions 21 formed on the furnace bottom flange portion 9 of the furnace bottom portion 5.
As shown in FIG. 8, the upper surface of the protruding piece portion 19 is an inclined surface 190 a that is inclined downward toward the turning direction when the outer ring member 7 is connected. The inclination angle of the inclined surface 190a is preferably about 3 ° to 10 °.

<Furnace bottom>
The entire shape of the furnace bottom portion 5 is the same as that of the conventional one shown in FIGS. 11 and 12, the lower surface is formed by the iron skin 15, and the refractory brick 17 is lined on the iron skin 15. A furnace bottom flange portion 9 is formed on the iron skin 15 of the furnace bottom portion 5.
The furnace bottom flange portion 9 can come into contact with the main body flange portion 13. As shown in FIG. 6, the bottom flange portion 9 is provided with convex piece portions 21 protruding outward at predetermined intervals in the circumferential direction. In the example shown in FIG. 6, the number of the convex piece portions 21 is four, but the number is not particularly limited. The convex piece portion 21 can be inserted between the adjacent protruding piece portions 19 formed on the outer ring member 7. For example, as shown in FIG. 7, a protruding piece 21a is formed between the protruding pieces 19A and 19B, a protruding piece 21b is provided between the protruding pieces 19B and 19C, and a protruding piece 19C is provided between the protruding pieces 19C and 19D. The convex piece portion 21c can be inserted between the protruding piece portions 19D and 19A.
As shown in FIG. 8, the lower surface of the convex piece portion 21 is an inclined surface 210 a that is inclined downward toward the turning direction when the outer ring member 7 is connected. The inclination angle of the inclined surface 210a is the same as the inclination angle of the protruding piece 19, and is preferably about 3 ° to 10 °.

The connection operation of the converter furnace bottom connection structure configured as described above will be described.
As shown in FIG. 2, the furnace bottom portion 5 lined with a refractory brick is disposed below the opening 11 of the main body portion 3. At this time, it arrange | positions so that the convex piece part 21 may be located between the some protrusion piece parts 19 of the outer ring member 7 when planarly viewed. In this state, the furnace bottom 5 is raised. When the furnace bottom part 5 rises, the convex piece part 21 passes between the adjacent protruding piece parts 19, and the furnace bottom flange part 9 of the furnace bottom part 5 abuts on the main body flange part 13 (see FIGS. 3 and 4).

In this state, the outer ring member 7 is rotated in the direction of the arrow in FIGS. The method of rotating the jack by connecting the rod side of the jack to the outer ring member 7 is to take the reaction force of the main body side of the jack with a fixed part (for example, the main body part 3 or a gantry), and Elongate.
By rotating the outer ring member 7, as shown in FIGS. 9 and 10, the protruding piece portion 19 of the outer ring member 7 enters below the protruding piece portion 21, and further, the protruding piece portion 19 and the protruding piece portion 21 are inclined. When the surfaces 190 a and 210 a come into contact with each other, the convex piece portion 21 is pushed up by the protruding piece portion 19. As a result, the furnace bottom flange 9 is pressed against the main body flange 13 and the furnace bottom 5 is connected to the main body 3.

  Since the inclined surfaces 190a and 210a are formed on the protruding piece portion 19 and the protruding piece portion 21 as described above, the protruding piece portion 19 and the protruding piece portion are rotated before the outer ring member 7 is rotated as shown in FIG. No. 21 has a certain gap s in the vertical direction, and even if there is a deformation or the like due to heat, the two do not collide and the protruding piece part 19 cannot enter below the protruding piece part 21. That is, by forming the inclined surfaces 190a and 210a on the projecting piece portion 19 and the convex piece portion 21, a play for absorbing deformation due to heat is formed.

As described above, according to the present embodiment, the main body portion 3 and the furnace bottom portion 5 can be connected only by rotating the outer ring member 7, so that the connecting operation can be extremely simple and smooth.
Further, by forming the inclined surfaces 190a and 210a on the protruding piece portion 19 and the protruding piece portion 21, even if the outer ring member 7 or the furnace bottom portion 5 is deformed by heat, it can be absorbed.

  In addition, after rotating the outer ring member 7 and connecting the furnace bottom 5 to the main body 3, it is preferable to provide a stopper so that the outer ring member 7 does not rotate in the opposite direction. As an example of a stopper, the outer ring member 7 and a fixed part (for example, the main body part 3, a gantry, etc.) are connected via a turnbuckle, and the outer ring member 7 is rotated to connect the furnace bottom part 5 to the main body part 3. In this state, the outer ring member 7 is tightened so as not to rotate in the opposite direction by the turnbuckle.

DESCRIPTION OF SYMBOLS 1 Furnace 3 Main body part 5 Furnace bottom part 7 Outer ring member 9 Furnace bottom flange part 11 Opening part 13 Main body flange part 15 Iron skin 17 Refractory brick 19 Projection piece part 190a Inclined surface 21 Convex piece part 210a Inclined surface 51 Furnace body 53 Main body Part 55 Furnace bottom 57 Flange part (main part)
59 Flange (furnace bottom)
61 Furnace bottom exchanging device 63 Furnace bottom stand 65 Support table 67 Lifting device 69 Traveling carriage

Claims (4)

It is a connecting structure between the converter main body and the replaceable furnace bottom,
The lower end side extends downward from the main body portion, and the upper end side is rotatably attached to the opening peripheral edge portion of the main body portion, and is provided at the furnace bottom portion to the opening peripheral edge portion of the main body portion. A flange portion that abuts,
The outer ring member has protruding piece portions protruding inward at a lower end side thereof at predetermined intervals in the circumferential direction,
The flange portion has convex piece portions protruding outward at predetermined intervals in the circumferential direction,
The outer ring member is rotated in a state where the convex piece portion is disposed between adjacent protruding piece portions of the outer ring member in a plan view and the flange portion is in contact with the opening peripheral edge portion of the main body portion. The converter bottom connection is characterized in that the projecting piece portion of the outer ring member abuts so as to push up the convex piece portion of the flange portion, and the furnace bottom portion is connected to the main body portion. Construction.   An inclined surface is formed on a contact surface between the protruding piece part and the protruding piece part, and the protruding piece part pushes up the protruding piece part by rotating the outer ring member. The connecting structure of the converter furnace bottom according to 1.   A stopper is provided for preventing the outer ring member from rotating in the direction opposite to the rotation direction in a state where the outer ring member is rotated and the furnace bottom is connected to the main body. The connecting structure of the converter furnace bottom according to claim 1 or 2.   4. The converter bottom connection structure according to claim 3, wherein the stopper includes a turnbuckle.

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