CN111006512A - Anti-cracking structure for fire-resistant pouring and anti-cracking method thereof - Google Patents
Anti-cracking structure for fire-resistant pouring and anti-cracking method thereof Download PDFInfo
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- CN111006512A CN111006512A CN201911398970.0A CN201911398970A CN111006512A CN 111006512 A CN111006512 A CN 111006512A CN 201911398970 A CN201911398970 A CN 201911398970A CN 111006512 A CN111006512 A CN 111006512A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D1/00—Casings; Linings; Walls; Roofs
- F27D1/16—Making or repairing linings increasing the durability of linings or breaking away linings
- F27D1/1626—Making linings by compacting a refractory mass in the space defined by a backing mould or pattern and the furnace wall
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- Furnace Housings, Linings, Walls, And Ceilings (AREA)
Abstract
The invention relates to the technical field of refractory materials, and discloses an anti-cracking structure for refractory pouring and an anti-cracking method thereof, wherein the anti-cracking structure comprises the following components: a refractory casting material body; the metal grid net is embedded in the refractory pouring material body, wherein the plane of the metal grid net is parallel to the cross section of the refractory pouring material body. The anti-cracking structure for fire-resistant pouring has the advantage of good anti-cracking effect.
Description
Technical Field
The invention relates to the technical field of refractory materials, in particular to an anti-cracking structure for refractory pouring and an anti-cracking method thereof.
Background
When the refractory castable is poured in a large volume, the volume of the refractory castable is shrunk due to drying shrinkage at normal temperature, and irregular cracks which are difficult to expect are generated on the surface of the original castable along with the volume shrinkage. The cracks can not obviously affect the high-temperature resistance of the refractory material, but can affect the structural strength and safety, and can induce the material to fall off to cause local failure or burnthrough in severe cases, thereby causing the leakage of high-temperature materials in the kiln and even causing safety accidents.
Because drying shrinkage is an inherent physical property and is difficult to completely eliminate, when many kiln lining refractory materials are designed and constructed, measures such as partition block pouring construction, expansion joint manufacturing and the like are usually adopted, a large-volume refractory material construction body is unitized and miniaturized, and the occurrence and development of irregular cracks are avoided. However, these gaps can become out of control with the ingress of material dust, and the cyclic volume changes that result from the cooling and heating cycles. Can become a source of the failure of the refractory material of the furnace lining under specific environment.
In addition, some measures such as adding steel fibers to achieve the anti-cracking effect exist, but the steel fibers are insufficient, although the temperature resistance can be improved by improving the grade of the material, the steel fibers cannot compete with general refractory materials in the aspects of refractoriness and heat insulation performance, and the adding of the steel fibers is limited in a certain range in consideration of chemical reaction under high temperature and specific environment, so that the steel fibers cannot be applied to all scenes.
Of course, the drying shrinkage can be offset by using aluminum powder and azo type normal temperature expansion. These substances generally affect the volume change of the material at normal temperature through chemical reaction, and the curing speed of the material itself needs to be in a specific proportional relationship with the reaction speed of the expanding agent. However, in the construction of refractory materials, the amount of water used and the temperature of the materials are uncertain, which may cause the swelling agent to lose its function, and the case of material defect caused by improper use of the swelling agent is not rare, and in severe cases, the material may even be pulverized and lose structural strength.
Disclosure of Invention
Technical problem to be solved
The invention aims to provide an anti-cracking structure for refractory pouring and an anti-cracking method thereof, which aim to solve the technical problem that a refractory pouring material in the prior art is easy to crack due to drying shrinkage.
(II) technical scheme
In order to solve the above-mentioned technical problem, according to a first aspect of the present invention, there is provided a crack-resistant structure for refractory casting, including: a refractory casting material body; the metal grid net is embedded in the refractory pouring material body, wherein the plane of the metal grid net is parallel to the cross section of the refractory pouring material body.
The metal grid net is embedded in the position, close to the surface of the construction body, of the refractory pouring material body.
The refractory pouring material body is provided with one or more metal grid nets, and the metal grid nets are arranged at intervals along the thickness direction of the refractory pouring material body.
Wherein the mesh shape of the metal grid net is rectangular or rhombic.
Wherein the aperture of the meshes of the metal grid mesh is more than or equal to 50 mm and less than or equal to 150 mm.
The diameter of the metal grid net is more than or equal to 1 mm and less than or equal to 5 mm.
The depth of the metal grid net embedded in the refractory pouring material body is more than or equal to 5 mm and less than or equal to 50 mm from the construction body surface of the refractory pouring material body.
According to a second aspect of the present invention, there is also provided a method of crack resistance for refractory casting, comprising: stirring the refractory pouring material; placing the stirred refractory pouring material into a mold or a limited pouring area; placing a metal grid mesh onto a shallow surface of the refractory casting before the refractory casting has not cured, pressing the metal grid mesh so that the metal grid mesh is fully immersed in the slurry of the refractory casting; and standing and maintaining until the refractory casting material is completely cured to form a refractory casting material body so as to finish the installation of the metal grid net in the refractory casting material.
And after the refractory pouring material is placed into the mold or the limited pouring area, vibrating and exhausting the refractory pouring material.
According to a third aspect of the present invention, there is also provided a crack-resistant method for refractory casting, comprising: fixing a metal grid net to be embedded into the surface of a wall body in a mold and connecting the metal grid net with the mold through a connecting piece; stirring the refractory pouring material; placing the stirred refractory pouring material into the mold; and standing and maintaining until the refractory pouring material is completely solidified and forms a refractory pouring material body, disconnecting the connecting piece to separate the mold from the metal grid mesh and dismantling the mold to complete the installation of the metal grid mesh in the refractory pouring material.
(III) advantageous effects
Compared with the prior art, the anti-cracking structure for fire-resistant pouring provided by the invention has the following advantages:
the metal grid net is embedded in the refractory pouring material body, the plane where the metal grid net is located is parallel to the cross section of the refractory pouring material body, so that the metal grid net can play a good anti-cracking role, a large amount of metal chips or iron oxide cannot be generated in the refractory pouring material body, through meshes which go deep into the refractory pouring material body cannot be formed even after metal is melted, and due to the arrangement of the metal grid net, the volume supporting function of the refractory pouring material body can be stably exerted, and negative influences on the normal-temperature structure and safety of the refractory pouring material body along with fluctuation of temperature or water adding amount and the like cannot be generated.
Drawings
FIG. 1 is a schematic structural view of a horizontal surface of a crack resistant refractory casting structure according to an embodiment of the present invention;
FIG. 2 is a schematic structural view of a shallow vertical surface of a crack resistant refractory casting structure according to an embodiment of the present invention;
FIG. 3 is a schematic flow chart illustrating the steps of a crack-resistant method for refractory casting according to a first embodiment of the present invention;
fig. 4 is a schematic flow chart illustrating steps of a crack-resistant method for refractory casting according to a second embodiment of the present invention.
Reference numerals:
1: a refractory casting material body; 2: a metal grid mesh; 200: and (5) molding.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
As shown in fig. 1 and 2, the refractory casting crack-resistant structure is schematically shown to include a refractory casting material body 1 and a metal grid mesh 2.
In the embodiment of the present application, the metal grid mesh 2 is embedded inside the refractory casting body 1, wherein the plane of the metal grid mesh 2 is parallel to the cross section of the refractory casting body 1. Specifically, the metal grid net 2 is embedded in the refractory pouring material body 1, and the plane where the metal grid net 2 is located and the cross section of the refractory pouring material body 1 are arranged in parallel, so that the metal grid net 2 can play a good anti-cracking role, a large amount of metal scraps or iron oxide cannot be generated in the refractory pouring material body 1, through meshes which go deep into the interior cannot be formed even after metal is melted, and the volume supporting function of the refractory pouring material body 1 can be stably played due to the arrangement of the metal grid net 2, and negative influences on the normal temperature structure and safety of the refractory pouring material body 1 along with fluctuation of temperature or water adding amount and the like cannot be generated.
In a preferred embodiment of the present application, as shown in fig. 1 and 2, the metal grid mesh 2 is embedded in the refractory casting body 1 near the surface of the construction body. Specifically, the construction body surface refers to a surface with a high stress probability, and the metal grid mesh 2 is disposed at a position of the refractory casting body 1 close to the construction body surface, so that irregular cracks of the refractory casting body 1 due to the construction body surface can be effectively prevented from occurring, the cracks are prevented from extending into the refractory casting body 1, the structural strength of the refractory casting body 1 is ensured, and the construction safety is ensured.
In a preferred embodiment of the present application, as shown in fig. 1 and 2, the metal grid mesh 2 is one or more and is arranged at intervals along the thickness direction of the refractory casting body 1. Specifically, the plurality of metal grid nets 2 are arranged, so that the structural strength of the refractory pouring material body 1 can be better enhanced, and the condition that a plurality of irregular cracks are generated on the surface of the construction body of the refractory pouring material body 1 is effectively avoided.
It should be noted that even a plurality of the metal grid nets 2 are preferably provided on the side close to the surface of the construction body of the refractory cast material main body 1.
In a preferred embodiment of the present application, as shown in fig. 1 and 2, the mesh shape of the metal grid mesh 2 is rectangular or diamond-shaped. Specifically, as the metal grid net 2 is embedded in the refractory pouring material body 1, the meshes of the metal grid net 2 are rectangular or rhombic, so that the front and the rear refractory pouring materials of the metal grid net 2 can be connected with each other, and therefore, compared with the case that the meshes of the metal grid net 2 are round or oval, the distance between the meshes of the metal grid net 2 is small, the refractory pouring materials in the front and the rear of the metal grid net 2 cannot be separated, and the integral structural strength of the refractory pouring anti-crack structure is ensured.
In a preferred embodiment of the present application, the mesh opening of the metal grid mesh 2 is equal to or greater than 50 mm and equal to or less than 150 mm. Thus, the refractory pouring materials arranged in front of and behind the metal grid net 2 can be bonded into a whole, and the reduction of the overall structural strength of the anti-cracking structure for refractory pouring due to mutual falling is avoided.
The above-mentioned so-called "front and rear of the metal grid net 2" is described in the left and right directions shown in fig. 2.
Preferably, the mesh aperture of the metal grid mesh 2 is 50 mm, 80 mm, 100 mm, 120 mm or 150 mm.
In one embodiment of the present application, the wire diameter of the metal grid mesh 2 is 1 mm or more and 5 mm or less. Specifically, by setting the diameter of the metal grid net 2 within the above range, the situation that the refractory pouring materials located in the front and rear directions of the metal grid net 2 are separated from each other due to the fact that the mesh of the metal grid net 2 is too thin and the overall structural strength of the metal grid net 2 is reduced can be avoided, and meanwhile, the situation that the mesh of the metal grid net 2 is too thick and the refractory pouring materials located in the front and rear directions of the metal grid net 2 are separated from each other can be effectively avoided.
Preferably, the wire diameter of the metal grid mesh 2 is preferably 1 mm, 3 mm or 5 mm, etc.
As shown in fig. 1 and 2, in a preferred embodiment of the present application, the depth of the metal grid mesh 2 embedded in the refractory casting body 1 is greater than or equal to 5 mm and less than or equal to 50 mm from the construction body surface of the refractory casting body 1. Thus, under the action of external force, the construction body surface of the refractory pouring material body 1 is stressed firstly, so that irregular cracks are easily generated on the construction body surface of the refractory pouring material body 1, and in order to avoid the irregular cracks from extending to the inside of the refractory pouring material body 1, the metal grid net 2 can be additionally arranged on the construction body surface of the refractory pouring material body 1, which is close to the construction body surface. In this way, cracks occurring on the surface of the construction body can be effectively prevented from extending into the refractory cast material body 1.
As shown in fig. 3, according to a second aspect of the present invention, there is also provided a crack-resistant method for refractory casting, comprising:
and step S1, stirring the refractory pouring material.
In step S2, the refractory casting material after stirring is placed in the mold 200 or a defined casting area (not shown).
Step S3, before the refractory casting material is not cured, placing the metal grid mesh 2 on the shallow surface of the refractory casting material, pressing the metal grid mesh 2 so that the metal grid mesh 2 is fully immersed in the slurry of the refractory casting material.
Step S4, standing and curing until the refractory casting material is completely cured and forms the refractory casting material body 1, so as to complete the installation of the metal grid mesh 2 in the refractory casting material.
It should be noted that, when the refractory casting material is poured and the refractory casting material is not yet cured, a layer of metal grid mesh 2 is implanted on the shallow surface of the refractory casting material, and the metal grid mesh 2 has the advantage of strong structural stability and can play a necessary role in supporting and resisting shrinkage, so that the refractory casting material can keep a relatively stable volume during the curing process, thereby reducing the occurrence of drying shrinkage cracks at normal temperature.
In a preferred embodiment of the present application, the slurry of the refractory casting material is vibrated to vent after the refractory casting material is placed within the mold 200 or defined casting area. Specifically, the vibrating exhaust can effectively prevent the air from being mixed in the refractory pouring material in the curing process to generate bubbles, and the gas in the slurry of the refractory pouring material can be effectively removed by adopting the vibrating exhaust method, so that the forming quality of the refractory pouring material is ensured.
As shown in fig. 4, according to a third aspect of the present invention, there is also provided a crack-resistant method for refractory casting, including:
step S10, the metal grid net 2 to be embedded into the wall surface is fixed in the mold 200 and the metal grid net 2 is connected with the mold 200 by a connecting member (not shown). Wherein, the connecting piece can be a metal wire, a steel bar or a bolt.
And step S20, stirring the refractory pouring material.
Step S30, the stirred refractory casting material is placed into the mold 200. Wherein, after the poured refractory pouring material is placed into the mold 200, it can be vibrated to exhaust air.
Step S40, standing and curing until the refractory casting material is completely cured and forms the refractory casting material body 1, disconnecting the connector to separate the mold 200 from the metal grid mesh 2 and removing the mold 200 to complete the installation of the metal grid mesh 2 in the refractory casting material.
In summary, the metal grid net 2 is embedded in the refractory pouring material body 1, and the plane where the metal grid net 2 is located and the cross section of the refractory pouring material body 1 are arranged in parallel, so that the metal grid net 2 can play a good anti-cracking role, a large amount of metal scraps or iron oxide cannot be generated in the refractory pouring material body 1, through meshes which go deep into the interior cannot be formed even after the metal is melted, and the volume supporting function of the refractory pouring material body 1 can be stably played by the arrangement of the metal grid net 2, and negative influences on the normal temperature structure and the safety of the refractory pouring material body 1 along with fluctuation of temperature or water adding amount and the like cannot be generated.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The utility model provides a fire-resistant anti-crack structure of pouring, its characterized in that includes:
a refractory casting material body; and
the metal grid net is embedded in the refractory pouring material body, wherein the plane where the metal grid net is located is parallel to the cross section of the refractory pouring material body.
2. The crack-resistant structure for refractory pouring according to claim 1, wherein the metal grid mesh is embedded in a portion of the refractory pouring material body close to the surface of the construction body.
3. The crack-resistant structure for refractory pouring according to claim 2, wherein the one or more metal grid meshes are arranged at intervals along the thickness direction of the refractory pouring material body.
4. The fire-resistant casting crack-resistant structure according to claim 1, wherein the mesh shape of the metal grid mesh is rectangular or rhombic.
5. The crack-resistant structure for refractory pouring according to claim 1, wherein the mesh openings of the metal grid mesh are 50 mm or more and 150 mm or less.
6. The crack-resistant structure for refractory pouring according to claim 1, wherein a wire diameter of the metal grid mesh is 1 mm or more and 5 mm or less.
7. The crack-resistant structure for refractory pouring according to claim 1, wherein the depth of the metal grid mesh embedded in the refractory pouring body is greater than or equal to 5 mm and less than or equal to 50 mm from the surface of the construction body of the refractory pouring body.
8. An anti-cracking method for refractory pouring, characterized by comprising:
stirring the refractory pouring material;
placing the stirred refractory pouring material into a mold or a limited pouring area;
placing a metal grid mesh onto a shallow surface of the refractory casting before the refractory casting has not cured, pressing the metal grid mesh so that the metal grid mesh is fully immersed in the slurry of the refractory casting;
and standing and maintaining until the refractory casting material is completely cured to form a refractory casting material body so as to finish the installation of the metal grid net in the refractory casting material.
9. The method of claim 8, wherein the refractory casting is vibrated to vent after the refractory casting is placed within the mold or defined casting area.
10. An anti-cracking method for refractory pouring, characterized by comprising:
fixing a metal grid net to be embedded into the surface of a wall body in a mold and connecting the metal grid net with the mold through a connecting piece;
stirring the refractory pouring material;
placing the stirred refractory pouring material into the mold;
and standing and maintaining until the refractory pouring material is completely solidified and forms a refractory pouring material body, disconnecting the connecting piece to separate the mold from the metal grid mesh and dismantling the mold to complete the installation of the metal grid mesh in the refractory pouring material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911398970.0A CN111006512A (en) | 2019-12-30 | 2019-12-30 | Anti-cracking structure for fire-resistant pouring and anti-cracking method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911398970.0A CN111006512A (en) | 2019-12-30 | 2019-12-30 | Anti-cracking structure for fire-resistant pouring and anti-cracking method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN111006512A true CN111006512A (en) | 2020-04-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911398970.0A Pending CN111006512A (en) | 2019-12-30 | 2019-12-30 | Anti-cracking structure for fire-resistant pouring and anti-cracking method thereof |
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| Country | Link |
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| CN (1) | CN111006512A (en) |
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- 2019-12-30 CN CN201911398970.0A patent/CN111006512A/en active Pending
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