Flat-top tunnel kiln top structure

Abstract

A kiln crown structure of a flat-top type tunnel kiln relates to the technical field of tunnel kilns and comprises a plurality of kiln roofs arranged on the upper portions of kiln walls on two sides along the length direction of the kiln walls, and a cross beam is fixed above the kiln roofs and between the upper ends of supporting columns outside the kiln walls on the two sides. The kiln top comprises a heavy castable working layer, a hollow ball castable heat insulation layer and a high-aluminum fiber blanket heat insulation layer which are sequentially arranged from bottom to top, the two ends of the hollow ball castable heat insulation layer and the two ends of the high-aluminum fiber blanket heat insulation layer make contact with the inner faces of the supporting columns outside the kiln walls on the two sides, and L-shaped steps are arranged on the inner faces of the upper portions of the kiln walls on the two sides. Expansion gaps are formed between the two ends of the heavy pouring material working layer and the inner surfaces of the L-shaped steps; the kiln top is internally provided with brick riveting and hanging assemblies and hook riveting assemblies which are arranged at equal intervals in a crossed mode. The structure is simple and compact, the heat insulation effect is good, the riveting hanging bricks and the riveting hooks are evenly distributed at intervals so that the bearing effect can be effectively achieved, and the risk that the riveting hanging bricks are sheared and broken due to kiln top thermal stress is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of tunnel kilns, in particular to a flat-top tunnel kiln roof structure. Background Art

[0002] As is known, tunnel kilns are built of refractory materials, thermal insulation materials and building materials, and are equipped with a continuously running heavy-duty kiln car loaded with products to be fired and a high-temperature kiln similar in shape to the tunnel. It is a modern continuous firing thermal equipment; the top of the tunnel kiln has two structures: flat top and arch top. The arch top structure of the tunnel kiln has a large space at the arch top, and heat is easily concentrated in this area. The upper and lower temperature difference layers are large, and the maximum loading capacity of the kiln car is limited; the flat-top tunnel kiln structure can reduce the stratification of heat in the kiln and make the temperature distribution in the kiln uniform; with the development of tunnel kilns, high-yield wide-body tunnel kiln technology continues to develop, and the ceramic industry / refractory material industry It is very common for the inner width of a tunnel kiln to be greater than 2m, and some are even greater than 3m. If a tunnel kiln with a large inner width still uses an arched roof, it is bound to have a large arch height, which seriously affects the uniformity of the upper and lower temperatures and the horizontal temperature in the kiln. Therefore, most wide-section tunnel kilns are developing in the direction of a flat-top kiln roof structure; the kiln roof of an existing flat-top tunnel kiln is generally assembled with a steel frame, lightweight refractory bricks, and prefabricated heat-resistant concrete hanging panels. While the installation is unstable, the heat insulation effect is not obvious, and the temperature in the kiln is easily lost, which directly affects the quality of the fired products; therefore, those skilled in the art provide a flat-top tunnel kiln roof structure to solve the above problems. Summary of the invention

[0003] In order to overcome the deficiencies in the background technology, the utility model discloses a flat-top tunnel kiln roof structure.

[0004] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions:

[0005] A flat-top tunnel kiln roof structure comprises a plurality of kiln roofs arranged on the upper part of kiln walls on both sides along the length direction thereof, the kiln roof is a flat-top structure, a crossbeam is fixed between the upper ends of support columns above the kiln roof and outside the kiln walls on both sides, the kiln roof comprises a heavy castable working layer, a hollow ball castable insulation layer, and a high-aluminum fiber blanket insulation layer arranged in sequence from bottom to top, both ends of the hollow ball castable insulation layer and the high-aluminum fiber blanket insulation layer are in contact with the inner surfaces of the support columns outside the kiln walls on both sides, an "L"-shaped step is arranged on the upper inner surfaces of the kiln walls on both sides, an expansion joint is arranged between the two ends of the heavy castable working layer and the inner surface of the "L"-shaped step, and the expansion joint is filled with zirconium-containing high-aluminum fiber cotton; a rivet-hanging brick assembly and a rivet hook assembly are arranged in an equidistant and cross-arranged manner inside the kiln roof, the upper ends of the rivet-hanging brick assembly and the rivet hook assembly are fixed to the bottom of the crossbeam, and the lower part is arranged inside the kiln roof.

[0006] The flat-top tunnel kiln roof structure, the riveted brick assembly includes riveted bricks, riveted hangers and I-beams, the riveted bricks are fastened to the I-beams through the riveted hangers, the I-beams are fixed to the bottom of the beams, and the lower part of the riveted bricks is arranged in the working layer of the heavy casting material.

[0007] The flat-top tunnel kiln roof structure has an expansion joint width of 1 to 3 cm.

[0008] In the flat-top tunnel kiln roof structure, the bottom of the riveted bricks is 2-3 cm away from the bottom surface of the heavy casting material working layer.

[0009] The flat-top tunnel kiln roof structure, the rivet hook assembly includes a rivet hook, a transverse rib, and a fixing piece. The transverse rib is fixed at the lower part of the rivet hook, the fixing piece is fixed to the upper hook of the rivet hook, the upper end of the fixing piece is fixedly connected to the bottom surface of the crossbeam, and the bottom of the rivet hook is 3-5 cm away from the bottom surface of the heavy casting material working layer.

[0010] In the flat-top tunnel kiln roof structure, the heavy castable working layer adopts high-aluminum castable or mullite castable, and the hollow ball castable insulation layer adopts high-aluminum hollow ball castable.

[0011] The flat-top tunnel kiln roof structure has expansion joints of 1-2 cm reserved between adjacent kiln roofs, and the expansion joints are filled with zirconium-containing high-aluminum fiber wool.

[0012] Due to the adoption of the above technical solution, the utility model has the following beneficial effects:

[0013] The flat-top tunnel kiln roof structure described in the utility model, by setting the kiln roof into three layers from bottom to top, a heavy castable working layer, a hollow ball castable insulation layer, and a high-aluminum fiber blanket insulation layer, adopts three layers of materials of different materials, can play a role of thermal insulation according to the different properties of heavy, light and thermal insulation materials, and can greatly reduce the weight of the kiln roof itself; and the riveted bricks as the main load-bearing refractory material for the kiln roof hanging have good tensile strength and resistance to thermal shear stress, and the riveted bricks and rivet hooks are evenly distributed at intervals, which can effectively play a load-bearing role, reduce the risk of shear fracture of the riveted bricks caused by the thermal stress of the kiln roof, and have a longer service life; the utility model has a simple and compact structure, good thermal insulation effect, and extends the service life of the kiln roof; and the flat-top kiln roof is more suitable for wide-body and large-capacity kilns, thereby improving the loading capacity and production efficiency, and the heat distribution is more uniform compared to the arched kiln. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The utility model is a structural schematic diagram of a tunnel kiln wall and a kiln roof.

[0015] Figure 2 yes Figure 1 A partial enlarged view of point A in the middle.

[0016] Figure 3 It is a schematic diagram of a riveted brick assembly of the utility model.

[0017] Figure 4 This is a schematic diagram of the rivet hook assembly of the utility model

[0018] In the figure: 1. Support column; 2. Crossbeam; 3. Kiln wall; 4. Kiln roof; 41. Heavy castable working layer; 42. Hollow ball castable insulation layer; 43. High alumina fiber blanket insulation layer; 5. Expansion joint; 6. Riveted brick assembly; 61. Riveted brick; 62. Riveted hanger; 63. I-beam; 7. Riveted hook assembly; 71. Riveted hook; 72. Transverse reinforcement; 73. Fixing parts. DETAILED DESCRIPTION

[0019] The present invention can be explained in detail through the following embodiments. The purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention.

[0020] Combined with Figure 1-4 The flat-top tunnel kiln roof structure comprises a plurality of kiln roofs 4 arranged on the upper part of the kiln walls 3 on both sides along the length direction thereof, and expansion joints of 1-2 cm are reserved between adjacent kiln roofs, and the expansion joints are filled with zirconium-containing high-aluminum fiber wool; the kiln roof 4 is a flat-top structure, and the kiln walls 3 are built with high-temperature refractory materials. A crossbeam 2 is fixed between the upper ends of the support columns 1 above the kiln roof 4 and outside the kiln walls 3 on both sides, and the kiln walls 3 on both sides and the kiln roof 4 constitute the working space of the tunnel kiln, the interior of which is the calcining space of the kiln, and the support columns 1 and the crossbeam 2 constitute the frame load-bearing structure of the kiln body;

[0021] The kiln roof 4 includes a heavy castable working layer 41, a hollow ball castable insulation layer 42, and a high-aluminum fiber blanket insulation layer 43 which are arranged in sequence from bottom to top. The heavy castable working layer 41 is casted with high-aluminum castable or mullite castable, and the hollow ball castable insulation layer 42 is cast with high-aluminum hollow ball castable. The kiln roof 4 is made of three layers of materials of different materials, which can play a role of thermal insulation according to the different properties of heavy, light and thermal insulation materials.

[0022] Both ends of the hollow ball castable insulation layer 42 and the high-aluminum fiber blanket insulation layer 43 are in contact with the inner surface of the support column 1 outside the kiln walls 3 on both sides, and an "L"-shaped step is provided on the upper inner surface of the kiln walls 3 on both sides. An expansion joint 5 is provided between the two ends of the heavy castable working layer 41 and the inner surface of the "L"-shaped step. The expansion joint 5 is filled with zirconium-containing high-aluminum fiber cotton, and the width of the expansion joint 5 is 1~3cm; equidistantly arranged riveted brick assemblies 6 and rivet hook assemblies 7 are provided inside the kiln roof 4, and the upper ends of the riveted brick assemblies 6 and the rivet hook assemblies 7 are fixed to the bottom of the cross beam 2, and the lower parts are cast and combined with the kiln roof 4 as a whole.

[0023] Specifically, the riveted brick assembly 6 includes a riveted brick 61, a riveted hanger 62 and an I-beam 63. The riveted brick 61 is fastened to the I-beam 63 through the riveted hanger 62. The I-beam 63 is welded and fixed to the bottom of the beam 2. The lower part of the riveted brick 61 is arranged in the heavy casting working layer 41. The bottom of the riveted brick 61 is 2-3 cm away from the bottom surface of the heavy casting working layer 41. The riveted brick 61 adopts high-aluminum high-temperature calcined refractory bricks with grooves all over the body. It can be firmly fixed in the heavy casting working layer 41 and the hollow ball casting insulation layer 42 to play a load-bearing role. The riveted brick 61 serves as the main load-bearing refractory material for hanging the kiln roof 4 and has good tensile strength and resistance to thermal shear stress.

[0024] Specifically, the rivet hook assembly 7 includes a rivet hook 71, a transverse rib 72, and a fixing piece 73. The transverse rib 72 is fixed to the lower part of the rivet hook 71, and the fixing piece 73 is fixed to the upper hook of the rivet hook 71. The upper end of the fixing piece 73 is welded to the bottom surface of the beam 2, and the bottom of the rivet hook 71 is 3-5 cm away from the bottom surface of the heavy casting material working layer 41; the rivet hook 71 and the transverse rib 72 are made of heat-resistant stainless steel, which can share the load-bearing part of the kiln roof and offset the risk of breakage of the riveted bricks caused by the thermal stress of the kiln roof.

[0025] The flat-top tunnel kiln roof structure, when in use, can widen the kiln body by simply increasing the number of riveted brick assemblies 6 and riveted hook assemblies 7. By adjusting the arrangement density of the riveted brick assemblies 6 and riveted hook assemblies 7, the load-bearing load per unit area of ​​the kiln roof can be adjusted according to actual needs, and the design thickness of the kiln roof casting working layer can be adjusted; therefore, it is more conducive to the construction of wide-body, large-capacity tunnel kilns and reduces the difficulty of design and construction.

[0026] The parts not described in detail in this utility model are prior art.

[0027] The embodiments selected in this article for the purpose of disclosing the invention of the utility model are currently considered to be suitable, but it should be understood that the utility model is intended to include all changes and improvements of the embodiments that belong to the scope of the present concept and utility model.

Claims

1. A flat-top tunnel kiln roof structure, comprising a plurality of kiln roofs arranged on the upper part of the kiln walls on both sides along the length direction thereof, characterized in that: The kiln roof is a flat roof structure. A crossbeam is fixed between the upper ends of the support columns above the kiln roof and outside the kiln walls on both sides. The kiln roof includes a heavy castable working layer, a hollow ball castable insulation layer, and a high-aluminum fiber blanket insulation layer arranged in sequence from bottom to top. Both ends of the hollow ball castable insulation layer and the high-aluminum fiber blanket insulation layer are in contact with the inner surfaces of the support columns outside the kiln walls on both sides. "L"-shaped steps are provided on the upper inner surfaces of the kiln walls on both sides. Expansion joints are provided between the two ends of the heavy castable working layer and the inner surfaces of the "L"-shaped steps. The expansion joints are filled with zirconium-containing high-aluminum fiber cotton; rivet-hanging brick assemblies and rivet hook assemblies are arranged equidistantly and crosswise inside the kiln roof. The upper ends of the rivet-hanging brick assemblies and the rivet hook assemblies are fixed to the bottom of the crossbeam, and the lower parts are arranged inside the kiln roof.

2. The flat-top tunnel kiln roof structure according to claim 1 is characterized in that: The expansion joint width is 1~3cm.

3. The flat-top tunnel kiln roof structure according to claim 1 is characterized in that: The riveted brick assembly comprises a riveted brick, a riveted hanger and an I-beam. The riveted brick is fastened to the I-beam through the riveted hanger. The I-beam is fixed to the bottom of the beam. The lower part of the riveted brick is arranged in the working layer of the heavy casting material.

4. The flat-top tunnel kiln roof structure according to claim 3 is characterized by: The bottom of the riveted brick is 2-3cm away from the bottom surface of the heavy casting material working layer.

5. The flat-top tunnel kiln roof structure according to claim 1 is characterized in that: The rivet hook assembly includes a rivet hook, a transverse rib, and a fixing piece. The transverse rib is fixed at the lower part of the rivet hook, the fixing piece is fixed to the upper hook of the rivet hook, the upper end of the fixing piece is fixedly connected to the bottom surface of the beam, and the bottom of the rivet hook is 3-5 cm away from the bottom surface of the heavy casting material working layer.

6. The flat-top tunnel kiln roof structure according to claim 1 is characterized in that: The heavy castable working layer adopts high-aluminum castable or mullite castable, and the hollow ball castable insulation layer adopts high-aluminum hollow ball castable.

7. The flat-top tunnel kiln roof structure according to claim 1 is characterized by: An expansion joint of 1-2 cm is reserved between adjacent kiln roofs and filled with zirconium-containing high-aluminum fiber wool.

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