JP2019123912A - Refractory structure of torpedo car - Google Patents

Abstract

To prevent quasi-permanent refractories from falling off at the time of repair without requiring time and labor.SOLUTION: A refractory structure 2 of a torpedo car 1 includes: permanent bricks 9 disposed adjacent to the inside of an iron shell 4; wear bricks 11 disposed on the innermost side farthest from an iron shell 4 and coming into contact with charged molten iron; and a quasi-permanent refractories 10 disposed between the permanent bricks 9 and the wear bricks 11. The quasi-permanent refractory 10 has a structure in which fixed bricks 12 and irregular refractories 13 are alternately arranged along the circumferential direction of a conical part 3. A ratio obtained by dividing an execution length along the circumferential direction of the irregular refractories 13 by a length along the circumferential direction of the fixed bricks 12 adjacent to the irregular refractory 13 is set to 1 or more and 5 or less. An execution range along the circumferential direction of the irregular refractories 13 is set to an angle of greater than 0° and less than or equal to 30° around the center axis of the conical part 3.SELECTED DRAWING: Figure 4

Description

  The present invention relates to the structure of a refractory provided inside the iron shell of a mixing car.

In the steel making process, there are cases where a mixing car is used to transport the hot metal received from the blast furnace to a converter or a dephosphorization furnace that performs a de-C and de-P steps.
This mixing car has a main body having a substantially cylindrical appearance (a torpedo shaped appearance) with the rotation axis directed in the horizontal direction, and the inside of the main body is hollow so as to be able to accommodate hot metal, and the upper side It can accommodate the hot metal coming in and out from the furnace opening provided in. In addition, wheels are attached to the lower side of the main body, and are movable along the track. Specifically, the main body of the kneading wheel has a cylindrical straight body portion at the central side in the longitudinal direction (horizontal direction), and tapers such that the outer diameter decreases toward the end on both sides of the straight body portion A conical part of a shape is provided. The tip of the conical part is closed by a mirror (mirror part). As described above, the main body of the mixing wheel is formed into the above-described torpedo shape by sequentially combining the straight body portion, the conical portion, and the end plate in the longitudinal direction.

By the way, although the outer side of the kneading car is covered with iron skin, in order to convey the hot metal at the inner side of the iron skin, it is constructed in the state where refractorys are laminated. The refractory built inside this iron shell (hereinafter referred to as the refractory structure) is generally composed of a three-layer refractory consisting of the permanent brick, semi-perm refractory, and wear brick from the side (outside) in contact with the iron shell. It is done.
Among the layers of the refractory constituting the refractory structure described above, the wear brick which is disposed at the innermost and directly reacts with the hot metal and the slag has excellent wear resistance, erosion resistance and spalling resistance, and is ASC (Al ₂₎ A brick made of O ₃ —SiC—C) is widely used. On the other hand, this permanent brick and semi-perm refractories deployed on the outside of the wear brick are selected with priority given to heat insulation and minimum corrosion resistance (back up in case of wear brick trouble). It is widely used.

  Among the three-layered refractories described above, particularly semi-perm refractories are disposed between the wear brick and the permanent brick, and serve as cushions for both bricks. In addition, the semi-perm refractory also has a role of protecting the molten metal from entering into the permanent brick when the molten metal enters (inserts) into the joint of the wear brick. The semi-perm refractory protects the permanent brick, which is used semi-permanently once installed in a mixing car, from the insertion of molten metal and impact.

By the way, if a chaotic car is used for a fixed number of times, the wear brick in the position in contact with the hot metal will gradually wear away. The wear bricks thus worn out are repaired according to the following procedure.
That is, when repairing, it is necessary to first remove worn bricks from the interior of the chaotic car. For example, a part of the entire wear brick is removed using a heavy machine, and the removed wear brick is replaced with a new wear brick. However, an impact may be added to the refractory (for example, this permanent brick) constructed on the back of the wear brick at this time. When such an impact is applied, the refractory such as the permanent brick may be peeled off by the impact.

That is, in the case of a mixed car, it is necessary to have a refractory structure in which peeling of the refractory (the permanent brick or semi permanent brick) does not occur even when the wear brick is replaced and repaired.
In this regard, conventionally, a refractory structure as shown below has been proposed.
For example, in Patent Document 1, in order to pour and construct an irregular shaped refractory for a lining car of a mixing car, a technology in which a core is disposed in the mixing mill so that the fixed refractory can be fixed accurately and efficiently. Is disclosed. In the technology of Patent Document 1, an indeterminate refractory is poured into the surface of a permanent refractory (the permanent brick) formed on the inner surface of the iron shell of a mixing car, and the iron shell of the mixing car is installed. A plurality of through holes are provided, and an anchor is inserted into the through holes so as to protrude into the furnace. Specifically, in the technique of Patent Document 1, the above-described furnace outer head of the anchor is fixed by an anchor fixing structure provided outside the mixing car iron shell, and then a permanent refractory is attached to the inner surface of the mixing car iron shell. The inner core of the anchor is positioned and fixed at the inner end of the core of each anchor, and then a monolithic refractory is poured into the gap between the cored refractory and the cored refractory formed on the inner surface of the steel shell of the mixing car. ing.

  Further, in Patent Document 2, from the side of iron shell, the permanent brick having a thermal conductivity of 0.5 to 2.5 Kcal / mh ° C and the semi-perma brick having a thermal conductivity of 5 to 20 Kcal / mh ° C The technology of a multi-layered refractory lining structure of a mixing car, which is formed in order and further formed with an irregular shaped refractory having a thermal conductivity not exceeding the thermal conductivity of the quasi-perma brick, is disclosed.

In addition, Patent Document 3 discloses a technique for improving the durability of a monolithic refractor by constructing the monolithic refractor on the lining brick of a milling car whose thickness has been reduced by use.
Further, in Patent Document 4, a plurality of remaining lining bricks at the bottom position where the furnace port of the mixing truck is directed substantially horizontally is taken out by removing the metal adhering to the remaining lining bricks in the repair and blending mixing vehicle. The semi-cylindrical form is placed on the inner brick which has been inserted and fixed after the stages of inserting and fixing the inner brick having a predetermined lining thickness, and driving a plurality of anchor members into the joint of the remaining inner brick. Positioning, pressing in an indeterminate refractory into the space between the formwork and the remaining lining bricks, removing the formwork after completion of the repair of the lower half of the mixer furnace, and inverting the mixer furnace by 180 degrees. Then, the upper half, which is inverted and positioned below, is pressed into an amorphous refractory in the same manner as described above to complete the repair of the upper half, and the kneading furnace and the mold are inverted 90 degrees to lower the lower half. Unbuilt space remaining between the upper and lower parts A refractory lining of a mixing car comprising the steps of: pressing in an indeterminate refractory by the same method as described above; and pressing in the indeterminate refractory by the same method as described above, wherein an independent mold is provided at the furnace port. Repair techniques are disclosed.

Japanese Patent Application Laid-Open No. 10-053805 Japanese Patent Application Laid-Open No. 9-059707 JP 2000-212624 A Japanese Patent Application Laid-Open No. 62-158808

By the way, although the techniques of Patent Document 1 and Patent Document 2 described above disclose the technique of using an indeterminate refractory as a lining refractory, the core is installed when applied to a semi-perm refractory. In addition, it takes a lot of time for construction because it requires a long construction period.
Further, the techniques of Patent Document 3 and Patent Document 4 are to construct a monolithic refractor on a thick lining brick (wear brick), and use it for a semi-perm refractory having no frame for support or construction. There is a risk that the monolithic refractories may fall off during construction.

  The present invention has been made in view of the above-mentioned problems, and it is a mixing car which can prevent the semi-perm refractories and the present perm refractories from falling off at the time of repair of the wear brick while the construction does not take time and effort. The object is to provide a refractory structure.

In order to solve the above problems, the refractory structure of the mixing car according to the present invention takes the following technical measures.
That is, the refractory structure of the mixing car according to the present invention is disposed at a height equal to or less than the metal line of the conical part and is disposed inside the iron shell in the mixing car having a conical part having a circular cross section and a cone shape. Refractory structure of the mixing car, wherein the refractory structure of the conical part is disposed on the inner side farthest from the iron skin, the permanent brick provided adjacent to the inner side of the iron skin, and The wear brick has a wear brick in contact with the charged hot metal, and a semi permanent fire disposed between the permanent brick and the wear brick, wherein the semi permanent fire comprises a shaped brick and an unshaped fire resistant Objects are alternately arranged along the circumferential direction of the conical portion, and a working length along the circumferential direction of the monolithic refractory is a shaped brick adjacent to the monolithic refractory At a length along the circumferential direction of Ratio is 1 or more and 5 or less, and the working range along the circumferential direction of the monolithic refractory is an angle larger than 0 ° and 30 ° or less centering on the central axis of the conical portion It is characterized by

  According to the refractory structure of the mixing car of the present invention, it is possible to prevent the semi-perm refractory or the present perm refractory from falling off during the repair of the wear brick, though the construction does not require much time and effort.

FIG. 1 shows a mixing car provided with a refractory structure according to the invention. FIG. 2 is a cross-sectional view of a refractory structure when the mixing wheel of the present invention is cut at any position parallel to the cross section 1 and the cross section 2 and a cross section 3 of the conical wheel of FIG. . FIG. 5 is a developed view of the mixing wheel according to the present invention, developed by cutting it out at the top along the longitudinal direction. FIG. 5 is a developed view of the semi-perm refractories according to the present invention cut out and developed at the top along the longitudinal direction of the kneading wheel. It is the expanded view which notched and developed the quasi-perma refractories of Example and Comparative Example 1 in the top part along the longitudinal direction of a mixing car. It is the expanded view which notched the semi-perma refractories of Comparative example 2 and Comparative example 3 in the top along the longitudinal direction of the mixing wheel, and was developed. It is the figure which showed the drop-off state at the time of construction of a semi-perme fixed refractory. It is a figure showing the shift of the wear brick after exchange repair and repair of wear brick.

Hereinafter, an embodiment of a refractory structure 2 of a mixing wheel 1 according to the present invention will be described in detail based on the drawings.
The refractory structure 2 of the present embodiment is disposed inside the iron shell 4 in the mixing wheel 1 having the conical portion 3 having a circular cone shape in cross section. Specifically, the refractory structure 2 is provided in the conical portion 3 provided at both ends of the main body of the kneading wheel 1, and among the conical portions 3, the refractory structure 2 is provided at a height equal to or less than the metal line 5 It is.

Hereinafter, the mixing wheel 1 on which the refractory structure 2 of the present invention is provided will be described first.
As shown in FIG. 1, the mixing car 1 according to the present invention receives the molten iron discharged from the blast furnace and transports it to the converter and the dephosphorization furnace where the de-C and de-P steps are performed. It has a body. The main body of the mixing wheel 1 has a cylindrical straight body portion 6 on the center side in the longitudinal direction, and on both sides of the straight body portion 6, a cross section in which the radius of the cylinder decreases at a constant decreasing rate toward the end A circular cone-shaped (taper cone-shaped) conical portion 3 is formed.

In addition, a furnace port 7 is formed in the upper part of the main body of the mixing wheel 1 (the upper part of the straight barrel 6) so that the molten metal can be put inside the mixing wheel 1 and the molten metal can be taken out from the inside It has become. Furthermore, at both ends of the mixing wheel 1, mirror portions 8 which are vertically erected are formed.
And, the main body of the mixing wheel 1 is covered with a thick iron skin 4 so that it can support the internal hot metal weight, and the inside of this iron skin 4 can withstand the high temperature of the hot metal Thus, a refractory structure 2 in which the refractory is laminated is installed.

As shown in FIG. 2, the refractory structure 2 provided in the inside of the iron shell 4 of the mixing car 1 has three permanent permanent bricks 9, semi-perma refractory 10, and wear bricks 11 in order from the outside in contact with the iron shell 4. Composed of a layer of refractory.
Of the three layers described above, the wear brick 11 formed on the innermost side is in direct contact with the molten iron and slag contained in the interior of the kneading wheel 1, so that the wear resistance and the erosion resistance to the molten iron and slag, It is formed of a material having spalling resistance. In the present embodiment, as the wear brick 11, a monolithic refractory made of ASC (Al ₂ O ₃ -SiC-C) is used.

  Further, among the three layers described above, the permanent brick 9 formed on the outermost side leaks the molten metal to the outside of the chaotic vehicle 1 even when troubles such as insertion of the molten metal occur in the wear brick 11 It is provided as a backup of the wear brick 11 so that it does not happen. That is, since it is sufficient that the permanent brick 9 has the minimum thermal insulation and corrosion resistance, it is formed of a refractory material having these characteristics. In the present embodiment, a shamotte shaped brick is used for the permanent brick 9.

  Similar to the permanent brick 9 described above, the semi-perm refractor 10 uses a chamotte material widely in favor of heat insulation and minimum corrosion resistance. The semi-perma refractor 10 has a role as a buffer material between the wear brick 11 and the permanent brick 9 and, when the hot melt is inserted into the joint (seam) of the wear brick 11, the molten iron does not penetrate to the permanent brick 9 Have a role to protect. The semi-perm refractor 10 will be described in detail later.

In addition, "this permanent brick 9", "quasi-perm refractory 10", and "wear brick 11" are terms conventionally used on the spot, and are used synonymously also in this specification.
That is, the brick installed immediately inside the iron skin 4 of the conical part 3 is called "the permanent brick 9" and can be said to be the first layer. Further, a brick disposed in the upper layer (inward in the radial direction of the conical portion 3) of the “perm brick 9” is called “quasi-perm refractory 10”. "Quasi-perm refractory 10" is the second layer. Because of the above structure, it may be called "first permanent" or "second permanent", or may be called "external permanent" or "inner permanent", instead of "the permanent" or "the semi permanent". "This permanent brick 9" and "the semi-perm refractory 10" have substantially the same composition.

The brick provided in the upper layer (radially inner side of the conical part 3) of the "semi-perma brick" is called "wear brick 11". The wear brick 11 is a brick which must be melted and damaged because it contacts a high temperature hot metal, and is repaired and replaced as needed.
When the mixing car 1 provided with the refractory structure 2 described above is used a certain number of times, the wear brick 11 is worn out along with the use, and when the wear progresses to a certain thickness or less, the worn wear is used to prevent leakage. It is necessary to carry out repair (replacement repair) for removing the brick 11 and replacing it with a new wear brick 11. As a method of repairing such wear bricks 11, a replacement repair method is generally used in which a part of the wear bricks 11 is removed while impact is applied by a heavy machine such as a breaker and the new wear bricks 11 are replaced. At this time, for example, if it is attempted to use the heavy machine to extract the remaining wear brick 11, the shock from the heavy machine will be applied to the refractory on the back surface, and if severe, the semi-perma refractor 10 or the permanent brick 9 may fall off. There is sex.

Therefore, in the mixing car 1 according to the present invention, the semi-perma refractories 10 located at a height equal to or less than the metal line 5 of the conical portion 3 described above, the shaped brick 12 and the unshaped refractories 13 The structure is arranged alternately along the direction so that the above-mentioned disadvantages do not occur.
The metal line 5 indicates a range in which the molten metal is in direct contact (when the furnace opening 7 is facing upward) at the time of transfer of the molten metal by the mixing wheel 1 (when the molten metal is not discharged). That is, taking FIG. 1 as an example, the metal line 5 crosses the inside of the cylindrical straight body portion 6 and the tapered cone conical portion 3 along the horizontal direction (the upper side of FIG. 1 Shown as a dotted line).

  Further, in the example of FIG. 3, when the metal line 5 is developed with the line passing along the longitudinal direction at the top of the mixing wheel 1 as a boundary, the center of about 200 ° in the developed part of the conical part 3 It is shown as the end of an arc-shaped (fan-shaped) region with corners (shown in gray in FIG. 3 and having a circumferential length of 7398 mm). That is, the above-mentioned “quasi-perma refractory 10 located at a position lower than the metal line 5” is nothing but the quasi-perma refractory 10 provided in the gray area of the conical portion 3 in FIG. 3.

Now, as shown in FIG. 2, the shaped brick 12 constituting the semi-perm refractor 10 is a refractory (a so-called refractory brick) obtained by forming a powder refractor into a predetermined shape by means such as pressing in a refractor manufacturer is there. For such shaped brick 12, for example, a chamotte refractory material of 50% Al ₂ O _{3 and} 46% SiO ₂ can be used. Moreover, about the dimension of this fixed-shape brick 12, it is good for the width | variety which is arranged along the circumferential direction of the conical part 3 to be 50-250 mm, and for the thickness along the radial direction of the conical part 3 to be 10-150 mm. Refractory bricks having these refractor materials and dimensions have fixed dimensions, and therefore become a standard for setting thickness when applying (applying) the unshaped refractories 13 described later. There is.

  In addition, while the above-described fixed brick 12 is processed into a predetermined shape, the unshaped refractor 13 constituting the semi-perm refractor 10 can be constructed by changing it to an arbitrary shape like a castable. In this specification, it is referred to as a monolithic refractory 13 in the sense of distinguishing it from the fixed shaped brick 12 whose shape is fixed. That is, unlike the fixed refractories (the fixed brick 12), the unshaped refractories 13 can be applied to any shape and size at the place of application.

  In addition, although construction is easy compared with the fixed-shape brick 12, the monolithic refractor 13 needs the reference | standard of thickness in order to set it as fixed thickness. Therefore, as shown in FIG. 2 and FIG. 4, in the semi-perma refractories 10, the unshaped refractories 13 are alternately layered with the shaped bricks 12 based on the shaped brick 12 having a constant thickness (the conical portion 3 By being applied in layers along the direction, it is possible to apply a constant thickness.

In addition, the refractory structure 2 (particularly, the configuration of the semi-perm refractor 10) employed in the mixing wheel 1 of the present invention not only comprises the above-described shaped brick 12 and the unshaped refractor 13 alternately in the circumferential direction. It also has two features as shown in the following "feature 1" and "feature 2".
(Feature 1)
"In the cross section of the whole area in the longitudinal direction from the connection position with the straight body part 6 at the end of the conical part 3 to the mirror part 8 at the tip, the working length along the circumferential direction of the indeterminate refractory 13 The ratio divided by the length along the circumferential direction of the shaped brick 12 adjacent to the refractory 13 is set to 1 or more and 5 or less. "
(Feature 2)
“The construction range along the circumferential direction of the monolithic refractory 13 is an angle larger than 0 ° and not more than 30 ° around the central axis of the conical portion 3”
Next, the two features described above and the effects obtained by providing such features will be described.

Next, two features of the quasi-perm refractories 10 described above will be described.
The feature 1 is the circumferential length of the monolithic refractory 13 (the length along the circumference centering on the center line of the conical part 3) of the monolithic refractory 13 and the monolithic brick 12 adjacent to each other In the case where L _{N is} the length of the shaped brick 12 and L _S is the circumferential length of the shaped brick 12, the ratio (L _N / L _S ) of the lengths is set to 1 or more and 5 or less.

This length ratio (L _N / L _S ) is at the height of metal line 5 or less of conical part 3, even when cut at any place in the longitudinal direction, in other words, at any place in the longitudinal direction The length ratio (L _N / L _S ) described above needs to satisfy 1 or more and 5 or less.
When the length ratio (L _N / L _S ) described above is less than 1, a sufficient gap for applying the indeterminate refractory 13 can not be formed between the adjacent shaped bricks 12. As a result, the monolithic refractory 13 can not be sufficiently filled. When the shaped bricks 12 are disposed adjacent to each other at a short distance, there is a possibility that the shaped bricks 12 may contact with each other on the inner side. Therefore, it is necessary to process so that fixed brick 12 comrades do not contact by shaving a part of fixed brick 12, etc., and a construction period will be extended by the part | minute of the time which processes a brick.

On the other hand, when the above-mentioned length ratio (L _N / L _S ) is larger than 5, the distance between adjacent shaped bricks 12 becomes too long, and quasi-perma refractories on the back of the wear brick 11 are repaired. 10 (the monolithic refractory 13) may fall off.
Therefore, in the refractory structure 2 employed in the mixing wheel 1 of the present invention, the length ratio (L _N / L _S ) is set so that the semi-permanent refractory 10 can be prevented from falling off while shortening the construction period. 1 or more and 5 or less.

The feature 2 is to make the circumferential length of the monolithic refractory 13 installed between the shaped bricks 12 larger than 0 ° and smaller than or equal to 30 ° in terms of central angle. This feature 2 is defined by whether or not stable construction is possible when constructing a refractory having fluidity such as the monolithic refractor 13 inside the mixing and kneading wheel 1 in practice.
That is, consider the case where the monolithic refractories 13 constituting the quasi-perma refractories 10 are coated, for example, along the surface (vertical surface) of the permanent brick 9 vertically erected, for example, inside the kneading wheel 1 . At this time, the shaped brick 12 is first applied along the horizontal direction, and the monolithic refractor 13 is applied between the upper and lower shaped bricks 12 thus constructed. Since the construction of the monolithic refractory 13 spreads the monolithic refractory 13 from the bottom to the top along the surface of the permanent brick 9, if the curvature of the surface of the permanent brick 9 is too large ( In the case where the permanent brick 9 is greatly protruded to the front), there is a possibility that the monolithic refractory 13 may collapse and fall under its own weight. Therefore, the coating range of the monolithic refractory 13 can not be so wide (the inclination angle of the coating surface can not be so large).

That is, since the monolithic refractory 13 may fall off during construction if the monolithic refractory 13 is larger than 30 °, the monolithic refractory 13 is applied alternately with the monolithic brick 12 with a width of 30 ° or less Thus, the monolithic refractor 13 and the permanent brick 9 installed on the outside of the monolithic refractor 13 can be fixed without falling off.
From the above, in the refractory structure 2 of the present invention combining the features 1 and 2 described above, the quasi-perma refractory 10 and the permanent brick 9 are repaired when the wear brick 11 is repaired while the construction does not take much time. Can be prevented from falling off.

Next, the operational effects of the refractory structure 2 of the mixing wheel 1 of the present invention will be described in detail using Comparative Examples and Examples.
In Examples and Comparative Examples, the quasi-perma refractories 10 in which the range of construction (circumferential length to be constructed and angle range to be constructed) of the fixed brick 12 and the unshaped refractories 13 are variously changed “Working time of permanent refractory 10”, “presence or absence of falling off when fixed refractories 13 are installed between fixed bricks 12”, “presence or absence of falling off of semi permanent refractory 10 when the wear brick 11 is replaced” It is evaluated.

  Specifically, the quasi-perm refractories 10 of the embodiment and the comparative example are used for the refractory structure 2 constructed on a mixing wheel 1 having a capacity of 300 t. The mixing wheel 1 has an inner diameter of 4218 mm and a length of 3600 mm in the longitudinal direction of the straight body portion 6 of the iron shell 4. The conical portion 3 has a length of 3665 mm in the longitudinal direction, and has a tapered shape inclined at an angle of 15.05 ° with respect to the horizontal direction when viewed from the side.

The shaped brick 12 constituting the quasi-perma refractories 10 described above is a shaped brick of a chamotte having a chemical composition of Al ₂ O ₃ : 50%, SiO ₂ : 46%, and the length in the longitudinal direction is The width along the circumferential direction is set to 114 mm, and the thickness in the radial direction is set to 20 mm. In addition, the unshaped refractory 13 is a chamotte castable having a chemical composition of Al ₂ O ₃ : 43%, SiO ₂ : 47%, and the addition moisture is appropriately adjusted to 1 to 5% in accordance with the construction environment. It is done.

Clothing brick 11, the chemical composition _{Al 2 O 3: 72~80%,} SiC: 4~8%, C: 14% of ASC brick, and construction to construction thickness of 180Mm～450mm.
Further, as shown on the left side of FIG. 5, in the embodiment, the conical portion 3 which is cut and developed along the longitudinal direction at the lowermost portion is confirmed at three places in the longitudinal direction (cross section 1, cross section 2, cross section 3) It is In each cross section, the fixed brick 12 and the fixed brick 13 are alternately formed in the circumferential direction, and the length ratio of the fixed brick 12 to the fixed refractory 13 is 1.22 to 5.00, and the fixed refractory 13 is The installation angle is in the range of 5.2 to 15.5 °.

The cross section 1 is obtained by vertically cutting the tip of the conical part 3 (the tip of the straight body 6) of the conical part 3 having a length of 3600 mm along the longitudinal direction. Further, the cross section 2 is obtained by vertically cutting the middle of the conical portion 3 in the longitudinal direction. The cross section 3 is obtained by vertically cutting an end portion on the straight body portion 6 side in the longitudinal direction of the conical portion 3.
As shown on the right side of FIG. 5, Comparative Example 1 is the same as Example 1 in which the deployed state of the fixed brick 12 and the unshaped brick 13 is confirmed in each of the cross sections 1, 2 and 3. . In Comparative Example 1, semi-perm refractories having a length ratio of 5.00 between the shaped brick 12 and the unshaped refractor 13 and an angular range of 15.5 °, 21.3 °, 34.3 ° in the circumferential direction on which the unshaped refractor 13 is applied. Ten have been obtained. That is, in the comparative example 1, at the position of the cross section 3 having a small outer diameter in the conical part 3, there is a place where the shaped brick 12 is missing, and the angle range in which the unshaped refractory 13 is constructed is specified by the present invention. And the angle range outside of the present invention.

  As shown in the left side of FIG. 6, Comparative Example 2 is the same as Comparative Example 1 in which the deployed state of the fixed brick 12 and the unshaped brick 13 is confirmed in each of the cross section 1, the cross section 2 and the cross section 3. . In Comparative Example 2, a semi-perm refractories 10 is obtained in which the length ratio of the fixed brick 12 to the fixed refractory 13 is 0.04 to 5.00, and the installation angle of the fixed refractory 13 is 0.3 ° to 15.5 °. That is, in Comparative Example 2, the distance between the shaped bricks 12 is very narrow at the position of the cross section 3 having the smaller outer diameter in the conical portion 3 and the length ratio between the shaped brick 12 and the unshaped refractories 13 However, it is less than 1.0 specified by the present invention, and it is out of the angle range of the present invention.

  As shown in the right side of FIG. 6, in Comparative Example 3 as in Comparative Example 1 and Comparative Example 2, the deployed state of the shaped brick 12 and the irregular shaped brick 13 is confirmed in each of the cross sections 1, 2 and 3. It is In Comparative Example 3, a semi-perm refractories 10 having a length ratio of 1.22 to 6.14 for the shaped bricks 12 and the monolithic refractories 13 and a construction angle of 0.3 to 15.5 ° for the monolithic refractories 13 is obtained. That is, in Comparative Example 3, the distance between the shaped bricks 12 is very wide at the position of the cross section 1 having the large outer diameter in the conical portion 3, and the length ratio between the shaped brick 12 and the unshaped refractories 13 However, it is more than 5.0 specified by the present invention, and it is out of the angle range of the present invention.

  For the example 1 and the comparative examples 1 to 3 described above, the "construction time of the semi-perm refractory 10" described above, "presence or absence of detachment when the monolithic refractor 13 is constructed between the shaped bricks 12", Tables 1 to 4 show the results of evaluation of “presence or absence of dropout of the semi-perm refractory 10 when the wear brick 11 is replaced”.

  In addition, "construction time of semi-perm refractories 10" which is one of the evaluation items in Tables 1 to 4 is the total repair time (construction) when the refractory structure 2 of the mixing car 1 is totally repaired (total repair) It shows whether or not the construction time can be shortened when based on the time). Specifically, as shown in Table 5, with respect to a mixing vehicle 1 having a refractory structure 2 of the present invention, repair (repair) is performed to remove all the refractory structure 2 provided in the mixing vehicle 1 and renew it. In the case where repair work is carried out to construct all refractories, a working period of 23 days is required.

  However, in the case of the conventional refractory structure 2 before adopting the present invention, the number of days required for “quasi-perma brick construction” indicated by the process number “4” in Table 5 is 5 days. It can be understood that the construction period will take two days rather than three days. That is, in this embodiment, the case where the required number of days for "semi-perma brick construction" is longer than 3 days is evaluated as "x", and the case where the required number of days for "semi-perm brick construction" is 3 days or less is "o" It was evaluated.

  In addition, “presence or absence of falling off when the fixed refractor 13 is installed between the fixed bricks 12” refers to the fixed brick 12 after the fixed brick 12 is first installed in the semi permanent brick installation. When the monolithic refractories 13 are piled up and constructed, it is evaluated whether the monolithic refractories 13 can not be constructed and fall off. In this evaluation, the case where the monolithic refractory 13 fell off was evaluated as "x", and the case where the monolithic refractory 13 did not fall off was evaluated as "o".

  Furthermore, “presence or absence of dropout of the semi-perm refractories 10 when the wear brick 11 is replaced” refers to the sub-perm refractor 10 that was first applied to the chaotic vehicle 1, in other words, a sub-perm that requires replacement due to wear and tear. Whether or not the refractory 10 falls due to the impact of the breaker at the time of the replacement of the wear brick 11 is evaluated. In this evaluation, the case where the semi-perm refractory 10 fell off was evaluated as "x", and the case where the semi-perm refractory 10 did not fall off was evaluated as "o".

  According to Tables 1 to 4, when the above-described feature 1 and feature 2 are satisfied, the construction time of the semi-perm refractory 10 can be made within 3 days, and the unshaped fire resistance is formed between the shaped bricks 12 Even when the object 13 is constructed, the monolithic refractory 13 does not fall off, and even when the wear brick 11 is replaced, it can be seen that the semi-perm refractory 10 does not fall off due to the impact of heavy equipment. From the above, in the refractory structure 2 of the present invention combining the features 1 and 2 described above, the quasi-perma refractor 10 and the present perma refractories at the time of repair of the wear brick 11 while the construction does not take time and effort. Is judged to be able to prevent the

  That is, in the refractory structure 2 of the present invention, even if the impact of the heavy machine accompanying the replacement of the wear brick 11 is applied, the semi-perm refractory 10 and the permanent brick 9 do not fall off. Because the quasi-perma refractor 10 provided in the refractor structure 2 of the present invention is 5 or less at the above-mentioned length ratio, the interval between the shaped bricks 12 adjacent in the circumferential direction becomes wide. It is not too much. That is, between the adjacent shaped bricks 12, an indeterminate refractory 13 which is more likely to drop off than the shaped brick 12 is constructed, and it is in a state of easily dropping off if an impact is applied. However, as described above, if the distance between the adjacent shaped bricks 12 is not too large, the unshaped refractor 13 can be supported by the fixed brick 12 so as not to come off, so the unshaped refractor 13 (quasi permanent It is also possible to reliably prevent the falling off of the refractory 10) and, in turn, the falling off of the permanent brick 9 applied to the outer side of the semi-perm fire 10. Therefore, it does not take time and effort to repair the dropped semi-perm refractories 10 and the permanent bricks 9, and a large number of construction days is not required for the repair of the wear bricks 11. Is also easy.

  It should be understood that the embodiments disclosed herein are illustrative and non-restrictive in every respect. In particular, in the embodiment disclosed this time, matters not explicitly disclosed, such as operating conditions and conditions, various parameters, dimensions of components, weights, volumes, etc., deviate from the range normally practiced by those skilled in the art. It is not necessary for the person skilled in the art to use values that can easily be assumed.

DESCRIPTION OF SYMBOLS 1 Braided car 2 Refractory structure 3 Conical part 4 Iron skin 5 Metal line 6 Direct body part 7 Fire mouth 8 Mirror part 9 This perma brick 10 Quasi perma refractories 11 Wear brick 12 Shaping brick 13 Unshaped refractories

Claims (1)

In a mixing car having a conical section having a circular cross section and a cone shape, the refractory structure of the mixing car disposed at a height below the metal line of the conical section and inside the iron shell,
The refractory structure of the conical part comprises: a permanent brick disposed adjacent to the inside of the iron skin; a wear brick contacting the molten iron disposed inside and furthest away from the iron skin; The semi-perm refractories disposed between the permanent brick and the wear brick,
The semi-perm refractories have a structure in which shaped bricks and unshaped refractories are alternately provided along the circumferential direction of the conical portion,
The ratio of the construction length along the circumferential direction of the monolithic refractory divided by the length along the circumferential direction of the shaped brick adjacent to the monolithic refractory is 1 or more and 5 or less,
A refractory structure for a kneading car, wherein a construction range along a circumferential direction of the monolithic refractory is an angle larger than 0 ° and not more than 30 ° with respect to a central axis of the conical portion.