High-temperature-resistant furnace bottom plate

Abstract

The high-temperature-resistant furnace bottom plate comprises a base, a support and a placement plate which are sequentially arranged from bottom to top, the base is a circular plate, and air holes are formed in the base; the support comprises an annular plate, a plurality of protruding parts are arranged on the vertical side face of the annular plate at equal intervals, and the annular plate is divided into a plurality of same supporting assemblies. The placing plate is an annular plate and is divided into a plurality of identical sector plates. During load bearing, the pressure in the vertical direction is uniformly distributed to the base, the support and the placement plate, and the deformation of each part is small, so that the condition of breakage caused by torsion is less likely to occur; by optimizing the proportion of the raw materials in the silicon nitride ceramic and introducing the auxiliaries, the ceramic product with better toughness is prepared, and the ceramic product is not prone to fracture deformation in the high-temperature and high-pressure environment and has longer service life.

Description

Technical Field

[0001] The invention relates to the technical field of furnace bottom plates for high temperature processing, and in particular to a high temperature resistant furnace bottom plate and a preparation method thereof. Background Art

[0002] In the ring furnace of metallurgical and mechanical manufacturing plants, the furnace bottom plate is usually made of heat-resistant steel materials to carry steel coils and steel parts for hot processing production. This furnace bottom plate made of high-temperature alloy materials works under high temperature and load conditions of about 950℃ or even more than 1000℃ for a long time. The high-temperature resistance of the high-temperature alloy materials of the furnace bottom plate, especially the high-temperature strength and creep resistance, cannot meet the requirements of actual working conditions. The high-temperature creep rate of the metal material causes the furnace bottom plate to gradually bend and deform, and the high thermal expansion rate of the material causes the furnace bottom plate to crack and damage. Creep and cracking and other factors cause the service life of the steel furnace bottom plate made of high-temperature alloy materials to be short. More importantly, the deformed furnace bottom plate will affect the heat treatment quality and yield rate of the steel coils and steel parts carried, reducing production efficiency.

[0003] Therefore, furnace bottom plates made of high-temperature resistant ceramic materials have emerged. For example, Chinese patent CN106083076A discloses a Si-SiC composite high-temperature resistant ceramic for annular furnace bottom plates, whose raw material composition and wt% are: SiC with a particle size of 3 to 1 mm: 30 to 50%, SiC with a particle size of 0.074 to less than 1 mm: 15 to 35%, SiC with a particle size less than 0.074 mm: 30 to 45%, carbon powder with a particle size less than 0.074 mm: 1 to 10%, and additionally added with: a binder of 4 to 9% of the total weight percentage of the above raw materials; preparation steps: mixing and rolling; molding; drying; siliconizing reaction sintering; mechanical processing to obtain a furnace bottom plate for annular furnace. It has the advantages of high temperature resistance, good creep resistance, high temperature strength, good thermal shock resistance, and no cracking.

[0004] However, the current high-temperature resistant ceramic furnace bottom plate still has certain problems. Because it is an integrated pad structure, when it is subjected to high temperature and high pressure during processing, the steel coil exerts a great pressure on the furnace bottom plate. At the same time, the steel coil itself will deform to a certain extent under high temperature, resulting in different pressures at different contact points, and then generating vertical torsional forces on the surface of the furnace bottom plate, which can easily lead to the fracture of the furnace bottom plate after long-term use; and the density of the furnace bottom plate itself cannot be absolutely uniform. When the internal materials collide under high temperature, internal stress will be generated, resulting in deformation, cracking, etc. Therefore, a better high-temperature furnace bottom plate is needed. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a high temperature resistant furnace bottom plate and a preparation method thereof, which solves the problem of deformation and cracking in the prior art.

[0006] The present invention proposes a high-temperature resistant furnace bottom plate, comprising a base, a support and a placement plate which are arranged in sequence from bottom to top, wherein the base is a horizontally placed circular plate structure, and a plurality of vertically penetrating air holes are evenly arranged on the base; the support comprises a horizontally arranged circular ring plate structure, and a plurality of protrusions are evenly arranged on the vertical side surface of the support, and recessed portions are formed between adjacent protrusions, and the outermost side of the protrusions corresponds to the edge of the base, and the center of some recessed portions is provided with a radial vertical dividing surface, thereby dividing the support into a plurality of identical supporting components; the placement plate is a horizontally arranged circular ring plate structure, and the diameter of the placement plate is not less than the maximum diameter of the support, and a plurality of vertical dividing surfaces are evenly arranged on the placement plate, thereby dividing it into a plurality of identical fan-shaped plates.

[0007] Furthermore, a plurality of radially arranged supporting grooves are provided on the bottom surface of the base.

[0008] Furthermore, the base is an annular structure, the inner diameter of which matches the inner diameter of the support, and the inner diameter of the placement plate is smaller than the inner diameter of the support.

[0009] Furthermore, a heat conducting hole is provided on the outer end surface of the protruding portion of the support and penetrates radially to the inner annular surface thereof.

[0010] Furthermore, a horizontal guide groove connecting the end surface to the inner annular surface is provided on the upper surface of the protruding portion of the support.

[0011] Furthermore, the number of the sector plates is greater than the number of the support assemblies.

[0012] Furthermore, the thickness of the base is smaller than the thickness of the support, and the thickness of the placement plate is smaller than the thickness of the base.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. The furnace bottom plate structure of the present invention includes a base, a support and a placement plate which are arranged in sequence from bottom to top. There is inevitably a certain gap between the three. Therefore, when bearing weight, the vertical pressure is evenly distributed to the base, the support and the placement plate. Even if there is a difference in pressure in some areas due to the deformation of the steel coil, the pressure difference existing in the furnace bottom plate on the horizontal plane can be distributed to the deformation of the three components of the base, the support and the placement plate, so that the deformation of each component is smaller, and it is less likely to be broken due to torsion;

[0015] 2. The support of the present invention comprises a circular plate structure arranged horizontally, and a plurality of protrusions are arranged at equal intervals on the vertical side surface of the support, and recesses are formed between adjacent protrusions, so that part of the base and the placement plate are not directly in contact with the support, but are in the gap formed by the recesses, so that when the placement plate is subjected to force and longitudinal bending occurs, the recesses can slightly deform to relieve the pressure, thereby avoiding excessive internal stress and cracks;

[0016] 3. The support and placement plate of the present invention are divided into multiple identical parts by a number of vertical dividing surfaces, that is, there are gaps between the parts on the same plane. Therefore, when subjected to pressure and horizontal stress due to self-collision, the gaps between different parts can serve as buffers after lateral expansion, and will not cause fracture due to rigid contact of lateral stress. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of an embodiment of the present invention.

[0018] Figure 2 Schematic diagram of the expansion of various components in the embodiment of the present invention.

[0019] In the above drawings: 1, base; 2, support; 3, placement plate; 11, air vent; 12, support groove; 21, protrusion; 22, recess; 23, heat conduction hole; 24, horizontal guide groove; 31, fan-shaped plate. DETAILED DESCRIPTION

[0020] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0021] Example:

[0022] like Figure 1 As shown, the embodiment of the present invention provides a high temperature resistant furnace bottom plate, comprising a base 1, a support 2 and a placement plate 3 arranged in sequence from bottom to top. The thickness of the base 1 is less than the thickness of the support 2, and the thickness of the placement plate 3 is less than the thickness of the base 1.

[0023] like Figure 2 As shown, specifically, the base 1 is a horizontally placed annular plate structure, and a plurality of vertically penetrating air holes 11 are evenly arranged on the base 1, through which hot air can pass better, so that the entire furnace bottom plate heats up faster and the overall temperature is more uniform. Preferably, a plurality of radial support grooves 12 are also provided at the bottom of the base 1, so that the ground of the base 1 does not contact the ground as a whole, and the impurity particles on the ground are prevented from destroying the balance of the base 1.

[0024] The support 2 includes a horizontally arranged circular plate structure, and its inner diameter is the same as that of the base 1. A number of protrusions 21 are evenly spaced on the vertical side of the support 2, and recesses 22 are formed between adjacent protrusions 21. The outermost side of the protrusions 21 corresponds to the edge of the base 1, and the center of some recesses 22 is provided with a radial vertical dividing surface, thereby dividing the support 2 into several identical support components. Partial areas of the base 1 and the placement plate 3 are not directly in contact with the support 2, but are in the gap formed by the recesses 22. In this way, when the placement plate 3 is subjected to stress and longitudinal bending, it can be slightly deformed by the recesses 22 to relieve pressure, thereby avoiding excessive internal stress and cracks. In this embodiment, there are a total of six protrusions 21 and six recesses 22, and a vertical dividing surface is provided every other recess 22, that is, the entire support 2 is divided into three identical parts.

[0025] Preferably, a heat-conducting hole 23 is provided on the outer end face of the protruding portion 21 of the support 2, which penetrates radially to the inner annular surface thereof. Correspondingly, a horizontal guide groove 24 is provided on the upper surface of the protruding portion 21 of the support 2, which connects the end face to the inner annular surface. Through the horizontally arranged heat-conducting holes 23 and horizontal guide grooves 24, through-holes are opened inside the support 2 itself and on the contact surface between the support 2 and the placement plate 3, so that external heat can better enter therein, facilitating temperature rise. At the same time, the evenly distributed heat-conducting holes 23 and horizontal guide grooves 24 can also provide a larger space for releasing stress inside the support 2 and the placement plate 3, thereby avoiding the occurrence of fractures.

[0026] The placement plate 3 is a horizontally arranged circular plate structure, the diameter of the placement plate 3 is larger than the maximum diameter of the support 2 and the base 1, and a plurality of vertical dividing surfaces are arranged at equal intervals on the placement plate 3 to divide it into a plurality of identical sector plates 31. In this embodiment, six dividing surfaces are used to divide it into six identical sector plates 31. Preferably, the dividing surfaces between the sector plates 31 and the dividing surfaces between the parts in the manufacturing are arranged staggered and do not overlap each other, so as to avoid longitudinal fracture of the support plate caused by excessive local pressure.

[0027] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A high temperature resistant furnace bottom plate, characterized in that: It includes a base, a support and a placement plate which are arranged in sequence from bottom to top, the base is a horizontally placed circular plate structure, and a number of vertically penetrating air holes are evenly arranged on the base; the support includes a horizontally placed circular plate structure, and a number of protrusions are evenly spaced on the vertical side of the support, and recesses are formed between adjacent protrusions, the outermost side of the protrusions corresponds to the edge of the base, and the center of some recesses is provided with a radial vertical dividing surface, thereby dividing the support into a number of identical supporting components; the placement plate is a horizontally placed circular plate structure, and the diameter of the placement plate is not less than the maximum diameter of the support, and a number of vertical dividing surfaces are evenly spaced on the placement plate, dividing it into a number of identical fan-shaped plates.

2. A high temperature resistant furnace bottom plate as claimed in claim 1, characterized in that: A plurality of radially arranged supporting grooves are arranged on the bottom surface of the base.

3. A high temperature resistant furnace bottom plate as claimed in claim 1, characterized in that: The base is an annular structure, the inner diameter of which matches the inner diameter of the support, and the inner diameter of the placement plate is smaller than the inner diameter of the support.

4. A high temperature resistant furnace bottom plate as claimed in claim 1, characterized in that: The outer end surface of the protruding portion of the support is provided with a heat conducting hole which penetrates radially to the inner annular surface thereof.

5. A high temperature resistant furnace bottom plate as claimed in claim 1, characterized in that: A horizontal guide groove connecting the end surface to the inner annular surface is provided on the upper surface of the protruding portion of the support.

6. A high temperature resistant furnace bottom plate as claimed in claim 1, characterized in that: The number of the sector plates is greater than the number of the support assemblies.

7. A high temperature resistant furnace bottom plate as claimed in claim 1, characterized in that: The thickness of the base is smaller than the thickness of the support, and the thickness of the placement plate is smaller than the thickness of the base.

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