A heating type furnace table for annealing silicon steel coils

Abstract

The application discloses a heating type furnace table for silicon steel coil annealing, which comprises a bottom plate with a masonry base surface, a center masonry part with a straight column outer contour, a base brick layer and a top brick layer which are stacked one after another from bottom to top, and an outer peripheral masonry part which is arranged around the bottom end outer periphery of the base brick layer. The top brick layer is provided with a heating groove, and the top brick layer comprises a first brick body located at the outer edge and a second brick body which is arranged adjacent to the first brick body on the center side of the furnace table and located at the bottom of the heating groove. The base brick layer comprises a third brick body located at the outer edge of the center masonry part. The first brick body and the second brick body are partially crimped on the top surface of the third brick body. The middle part of the top surface of the third brick body is provided with a middle recess, the first brick body is provided with a straight column protruding part, and the straight column protruding part is matched with the recess. The heating type furnace table for silicon steel coil annealing realizes the interlocking of the first brick body and the third brick body at high temperature of the furnace table through the recess-protruding matching structure between the first brick body and the third brick body of the center masonry part.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of silicon steel annealing production, and particularly relates to a heating furnace table for silicon steel coil annealing. BACKGROUND

[0002] The heating furnace table is the main equipment for silicon steel coil annealing, is fixedly arranged on the ground, and comprises a furnace table center part and a sand sealing groove arranged around the center part. The furnace table center part comprises a bottom steel plate, an inner guard ring and an outer guard ring which are connected by welding, and the inner guard ring and the outer guard ring are arranged concentrically. A center masonry part combined by refractory bricks and mortar is arranged in a cavity formed by the bottom steel plate and the inner guard ring, and a heating groove is arranged on the top surface of the center masonry part. The heating groove is used for accommodating an electric heating element. A through hole for accommodating an inert gas pipe is arranged in the center of the furnace table, and the through hole penetrates the steel plate and the center masonry part. The bottom steel plate provides a flat base for the center masonry part. The outer guard ring and the inner guard ring are filled with a peripheral masonry structure, and the inner guard ring, the outer guard ring and the peripheral masonry structure are combined to form the sand sealing groove.

[0003] The technical defects of the existing furnace table are that the thermal expansion coefficient of the steel plate is greater than the thermal expansion coefficient of the refractory bricks. During the heating process of silicon steel heat treatment, the inner guard ring is heated quickly due to the heat transfer with the top layer of refractory bricks, the steel plate is heated and expanded, the volume of the steel plate is increased, the inner guard ring pushes the refractory bricks on both sides, the refractory bricks are loosened and gaps are generated between the refractory bricks, hot air flows downward through the gaps, the heating rate in the bell-type furnace is affected, and the energy consumption loss of the bell-type furnace is increased. The heat transfer in the steel plate causes the temperature of the welding part between the guard ring and the bottom steel plate to rise, the bottom steel plate is deformed due to local heating under the pressure of the refractory bricks, the furnace plate and the silicon steel coil, the flatness of the bottom steel plate is affected, the stability of the center masonry part is further deteriorated, the service life of the furnace table is shortened, the stability of the furnace plate and the quality of the annealed silicon steel coil are affected. Simply removing the inner guard ring will cause the refractory bricks at the outer edge of the center masonry part to loosen and further tilt outward, or the refractory bricks at the outer edge of the center masonry part and the limiting ring at the periphery will be extruded to generate cracks or break, thereby losing the constraint on other brick bodies in the center part of the furnace table, and the top layer of outer edge brick bodies provided with heating elements in the center part of the furnace table will also be tilted. SUMMARY

[0004] One of the purposes of the present application is to overcome the defects in the prior art, and to provide a heating furnace table for silicon steel coil annealing. The arc brick layer interlocking structure located at the outer edge of the center masonry part improves the tilting problem, reduces the energy consumption loss caused by the gaps in the furnace table, and prolongs the service life of the furnace table.

[0005] In order to achieve the above technical effects, the technical scheme of the present application is as follows: a heating furnace table for silicon steel coil annealing, comprising:

[0006] a bottom plate having a masonry base;

[0007] The central masonry part has a straight column-shaped outer contour and comprises a base brick layer and a top brick layer stacked in sequence from bottom to top;

[0008] The outer peripheral masonry part is arranged around the bottom end of the base brick layer.

[0009] The top brick layer is provided with a heating groove, and comprises a first brick body located at the outer edge and a second brick body located at the bottom of the heating groove and arranged adjacent to the first brick body at the center side of the stove table.

[0010] Part of the first brick body and the second brick body are pressed against the top surface of the third brick body; the top surface of the third brick body is provided with a middle recess, the first brick body is provided with a straight column-shaped protrusion, and the straight column-shaped protrusion is matched with the recess.

[0011] Preferably, a fourth brick body is arranged adjacent to the third brick body at the side close to the center of the stove table, the inner edge of the top end of the third brick body is provided with an end corner recess, and part of the fourth brick body is arranged in the end corner recess.

[0012] Preferably, the outer contour of the central masonry part is a cylindrical shape; the edge of the top brick layer is surrounded by a plurality of first brick bodies, and the proximal side surfaces of the two adjacent first brick bodies are provided with a side surface recess and a side surface protrusion spaced from the edge, and the side surface recess and the side surface protrusion are matched along the surrounding circumferential direction.

[0013] Preferably, the first brick body comprises a main body part and a straight column-shaped protrusion connected integrally, and the width of the straight column-shaped protrusion along the radial direction of the stove table is greater than 1 / 2 of the width of the main body part. Further, the width of the straight column-shaped protrusion along the radial direction of the stove table is 1 / 2 to 2 / 3 of the width of the main body part.

[0014] Preferably, the base brick layer comprises a bottom brick layer and an intermediate brick layer stacked in sequence from bottom to top, and the third brick body is arranged in the intermediate brick layer.

[0015] Preferably, a fifth brick body is arranged adjacent to the bottom end of the third brick body and away from the center of the stove table, a sixth brick body is arranged adjacent to the fifth brick body and away from the center of the stove table and above the fifth brick body, and the fifth brick body, the sixth brick body and the third brick body surround a sand sealing groove.

[0016] Preferably, the top surface of the fifth brick body is lower than the bottom surface of the fourth brick body.

[0017] Preferably, the outer edge of the outer peripheral masonry part is provided with a guard ring, and the guard ring is fixedly connected with the bottom plate.

[0018] Preferably, an insulation layer is arranged between the base brick layer of the central masonry part and the masonry base surface, or the masonry base surface of the central masonry part and the outer peripheral masonry part is paved with an insulation layer.

[0019] Preferably, at least one of the first brick, the third brick and the fourth brick is an arc brick, and the central angle of the arc brick is 40-72°. Further, the central angle of the arc brick is 45-60°.

[0020] The advantages and beneficial effects of the present application are as follows:

[0021] The heating type furnace table for silicon steel coil annealing realizes interlocking of the first brick and the third brick at high temperature of the furnace table through the concave-convex matching structure between the first brick and the third brick of the central masonry part.

[0022] The third brick is arranged in the base brick layer, and the stability of the brick of the base brick layer is improved by the constraint of the outer peripheral masonry part on the base brick layer, the problem of loosening and tilting of the first brick to the outside of the central masonry part is improved, the probability of gap between the bricks after the furnace table is heated and cooled for many times is reduced, the overall structure of the furnace table is maintained, and the service life of the furnace table is prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a sectional structure schematic diagram of the silicon steel coil annealing heating type furnace table of the embodiment;

[0024] Figure 2 is a three-dimensional structure schematic diagram of the first brick in the embodiment;

[0025] Figure 3 is a three-dimensional structure schematic diagram of the third brick in the embodiment;

[0026] Figure 4 is a three-dimensional structure schematic diagram of the first brick in another embodiment;

[0027] In the figure: 1, bottom plate; 2, central masonry part; 21, top brick layer; 211, first brick; 2111, straight column protruding part; 2112, side surface recessed part; 2113, side surface protruding part; 2114, main body part; 212, second brick; 213, seventh brick; 22, base brick layer; 221, third brick; 2211, middle recessed part; 2212, end angle recessed part; 222, fourth brick; 3, outer peripheral masonry part; 31, fifth brick; 32, sixth brick; 4, guard ring; 5, insulation layer. DETAILED DESCRIPTION

[0028] The specific implementation of the present application is further described below in combination with the drawings and embodiments. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and cannot be used to limit the protection scope of the present application.

[0029] In the description of the present application, it should be noted that, unless otherwise specified, the meaning of "a plurality of" is more than two; the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer" and the like is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0030] In the description of the present application, it should also be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixed connection, or it can be detachable connection, or fixed connection; it can be mechanical connection, or it can be electrical connection; it can be directly connected, or it can be indirectly connected. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0031] Difference between heating furnace platform with heating element and non-heating furnace platform without heating element

[0032] Heating furnace platform: the top surface of the heating furnace platform is provided with heating grooves opening upward, the heat treatment temperature of the silicon steel coil can reach about 1300℃, the electric heating element is arranged in the heating groove, and the electric heating element is in contact with the furnace platform for heat transfer; the top of the furnace platform is provided with furnace plates, i.e. the furnace plates are pressed on the top surface of the spacing bricks between the heating plates, and the furnace plates provide a bearing surface for the silicon steel coil; in order to reduce the heat transfer from the heating groove to the low temperature part around it, the gaps between the refractory bricks (including the interlayer gaps and the vertical direction joint gaps between the bricks in the same layer) are filled with mortar; because the expansion joint can accelerate the downward heat transfer of the electric heater and intensify the local expansion of the brick body, the expansion joint cannot be arranged;

[0033] Non-heating furnace platform: only used for bearing heat treatment workpieces such as silicon steel coils, and only needs to meet the flatness requirement for bearing silicon steel coils, so the expansion joint can be arranged between the bricks in the same layer and adjacent to each other in the stacked masonry structure to compensate for the transverse expansion of the bricks. The heating of the silicon steel coil is realized by the nozzle with an inner cover or other heating structure fixed to the inner cover. Based on the flow of air in the furnace, the furnace platform itself is uniformly heated; a metal guard ring is arranged around the car-type furnace platform.

[0034] Compared with the non-heating furnace platform, the top surface temperature of the heating furnace platform is higher, the thermal expansion of the refractory bricks is larger, and the inter-brick gaps are more likely to occur after multiple annealing, and the inter-brick gaps have a greater impact on the thermal efficiency and energy consumption of the heating element. Embodiment

[0035] As Figures 1-3As shown, the heating furnace table for annealing silicon steel coil of the embodiment comprises a bottom plate 1, a center masonry part 2 and an outer peripheral masonry part 3; the bottom plate 1 has a masonry base surface; the center masonry part 2 has a straight column shape in outer contour, and comprises a base brick layer 22 and a top brick layer 21 which are stacked in sequence from bottom to top; the outer peripheral masonry part 3 is arranged around the outer periphery of the bottom end of the base brick layer 22; the top brick layer 21 is provided with a heating groove, and comprises a first brick body 211 located at the outer edge and a second brick body 212 located at the center side of the furnace table and at the bottom of the heating groove and arranged adjacent to the first brick body 211; the base brick layer 22 comprises a third brick body 221 located at the outer edge of the center masonry part 2; a part of the first brick body 211 and the second brick body 212 are press-bonded to the top surface of the third brick body 221; the top surface of the third brick body 221 is provided with a middle recessed part 2211, and the first brick body 211 is provided with a straight column protruding part 2111 which is in recess-protrusion cooperation with the middle recessed part 2211.

[0036] In order to avoid the hot air flow downward through the gap between the brick bodies, the plumb direction mortar gap between the upper brick bodies is arranged in a staggered manner with the plumb direction mortar gap between the lower brick bodies. Therefore, the press-bonding of the second brick body 212 to the top surface of the third brick body 221 can be understood as that a part of the second brick body 212 is press-bonded to the top surface of the third brick body 221, and the remaining part is press-bonded to the top surface of another brick body which is horizontally and laterally arranged to the third brick body 221.

[0037] The center masonry part 2 has a straight column shape in outer contour, and the base brick layer 22 and the top brick layer 21 are vertically and oppositely stacked. The bottom plate is a metal plate, and can be specifically selected as a steel plate.

[0038] The second brick body 212 is subjected to the pressure of the furnace plate, and the second brick body 212 and the first brick body 211 are arranged adjacent to each other around the heating member. In the heating state, the straight column protruding part 2111 of the first brick body 211 is heated and expanded and clamped in the middle recessed part 2211. Since the middle recessed part 2211 is arranged at the center of the top surface of the third brick body 221 instead of the end corner, the first brick body 211 is abutted against the second brick body 212 and the third brick body 221 in the vertical direction, which is beneficial to ensure the position stability of the first brick body 211.

[0039] Further, the straight column protruding part 2111 is arranged on the side of the first brick body 211 close to the second brick body 212. With the increase of temperature, the temperature of the second brick body 212 and the straight column protruding part 2111 of the first brick body 211 is similar and expands synchronously. Otherwise, if the temperature of the second brick body 212 rises too fast, there is a significant temperature difference between the second brick body 212 and the first brick body 211, and the expansion difference between the second brick body 212 and the second brick body 212 will damage the straight column protruding part 2111, which is manifested as cracks or breakage of the fixed end of the straight column protruding part 2111, and further damage the interlocking structure of the first brick body 211 and the third brick body 221.

[0040] AsFigure 1 、 3 In another embodiment, as shown in FIG. 22, the fourth brick 222 is arranged adjacent to the third brick 221 on the side close to the center of the hearth, and the top end inner edge of the third brick 221 is provided with an end corner recess 2212, and the fourth brick 222 is partially arranged in the end corner recess 2212. Specifically, a part of the fourth brick 222 is arranged in the lateral opening formed by the end corner recess 2212 and the second brick 212, and the remaining part is pressed against the top surface of another brick on the side of the fourth brick 222. In the figure, the remaining part of the second brick 212 is pressed against the top surface of the fourth brick 222. The heating element and the second brick 212 are pressed downward against the top surface of the end corner recess 2212 through the fourth brick 222, and the vertical expansion of the second brick 212 and the fourth brick 222 increases the downward pressing force. The third brick 221 is arranged between the fourth brick 222, the lower brick of the fourth brick 222, and the outer peripheral masonry part 3 in the horizontal direction, which is beneficial to fixing the radial position of the third brick 221. The end corner recess 2212 is arranged between the intermediate recess 2211 in the radial direction of the furnace body, and the recess depth of the end corner recess 2212 in the horizontal direction of the furnace body is much smaller than the brick connecting part, which is beneficial to the third brick 221 to overcome the horizontal shear force of the fourth brick 222. Specifically, the end corner recess 2212 is also a vertical straight column.

[0041] Further, the seventh brick 213 is arranged adjacent to the side of the second brick 212, and the seventh brick 213 is arranged between the heating grooves and is pressed against the bottom surface of the fourth brick 222. Because the furnace plate is arranged above the top brick layer, the gravity of the furnace plate is transmitted to the top surface of the fourth brick 222 through the seventh brick 213, which also increases the pressure of the upper part on the top surface of the end corner recess 2212, and increases the static friction between the fourth brick 222 and the top surface of the third brick 221.

[0042] As Figure 4As shown in another embodiment, the outer contour of the central masonry part 2 is cylindrical; the edge of the top brick layer 21 is enclosed by a plurality of first bricks 211, and the approaching side surfaces of two adjacent first bricks 211 are provided with side surface recesses 2112 and side surface protrusions 2113 spaced from the edge, and the side surface recesses and the side surface protrusions are in convex-concave cooperation along the enclosing circumferential direction; the side surface recesses 2112 and the side surface protrusions 2113 are higher than the straight column protrusions 2111. The approaching side surface is a side surface extending in the vertical direction; optionally, both side surfaces of a first brick 211 are provided with side surface recesses 2112, and both side surfaces of another first brick 211 are provided with side surface protrusions 2113; or one side surface of a first brick 211 is provided with a side surface recess 2112, and the other side surface is provided with a side surface protrusion 2113. During the heating process of the furnace body, the first bricks 211 are interlocked and tightly abutted through the side surface protrusions 2113 and the side surface recesses 2112, and the convex-concave cooperation structure of the straight column protrusions 2111 and the intermediate recesses 2211 jointly acts, reducing the damage of the movement trend of the first bricks 211 to the straight column protrusions 2111 to the outside of the central masonry part 2.

[0043] As shown in another embodiment, Figure 2 , 4 As shown in another embodiment, the first brick 211 includes an integral main body part 2114 and a straight column protrusion 2111, and the width of the straight column protrusion 2111 along the radial direction of the furnace platform is greater than 1 / 2 of the width of the main body part 2114. During the heating of the furnace platform, the bricks and the mortar expand due to heat, and the connection between the straight column protrusion 2111 and the main body part 2114 is subjected to the maximum shearing force in the radial direction of the furnace body. The width of the straight column protrusion 2111 along the radial direction of the furnace platform is greater than 1 / 2 of the width of the main body part 2114, which is beneficial to improve the mechanical strength of the connection between the straight column protrusion 2111 and the main body part 2114. The width of the straight column protrusion 2111 along the radial direction of the furnace platform is 1 / 2 to 2 / 3 of the width of the main body part 2114, while ensuring that the third brick 221 top protrusion located radially outside the straight column protrusion 2111 has sufficient radial width and improves the strength of the third brick 221 top protrusion.

[0044] As shown in another embodiment, Figure 1 As shown in another embodiment, the base brick layer 22 includes a bottom brick layer and an intermediate brick layer stacked from bottom to top, and the third brick 221 is arranged in the intermediate brick layer. The bottom brick layer provides a base surface with a similar expansion coefficient for the intermediate brick layer above it.

[0045] As shown in another embodiment, Figure 1As shown, in another embodiment, the fifth brick 31 is adjacent to the bottom brick layer and the bottom end of the third brick 221 on a horizontal side away from the center of the furnace platform. The sixth brick 32 is adjacent to the fifth brick 31 on a horizontal side away from the center of the furnace platform and above it. The fifth brick 31, the sixth brick 32, and the third brick 221 form a sand sealing groove. After the furnace platform is heated, the third brick 221 and the fifth brick 31 press tightly together. At the same time, the bottom of the floor brick layer, which is cooler than the third brick 221, presses tightly together with the fifth brick 31, reducing the probability of sealing sand entering the gaps between the bricks.

[0046] like Figure 1 As shown, in another embodiment, the top surface of the fifth brick 31 is lower than the bottom surface of the fourth brick 222. The thermal expansion of the fourth brick 222 along the radial direction of the furnace platform will exert a horizontal shear force on the third brick 221. The misalignment of the top surface of the fifth brick 31 and the bottom surface of the fourth brick 222 helps to disperse the force on the third brick 221, preventing the upper half of the third brick 221 located on the horizontal side of the fourth brick 222 from being crushed by both sides.

[0047] Compared to the central masonry section 2, the outer perimeter masonry section 3 has a lower temperature and can serve as an outer perimeter constraint for the central masonry section 2, but gaps between bricks will also appear after long-term use.

[0048] like Figure 1 As shown, in another embodiment, a protective ring 4 is fixedly provided on the outer edge of the outer perimeter masonry section 3, and the protective ring 4 is fixedly connected to the base plate 1. The protective ring 4 of the outer perimeter masonry section 3 is far from the central masonry section 2, resulting in a lower temperature and less deformation of the protective ring 4 when the furnace platform heats up. The protective ring 4, through the outer perimeter masonry section 3, constrains the outer edge of the base brick layer 22, extending the overall service life of the furnace platform. The protective ring is welded to the base plate steel plate.

[0049] like Figure 1 As shown, in another embodiment, an insulation layer 5 is provided between the base brick layer 22 of the central masonry section 2 and the masonry base surface, or an insulation layer 5 is laid on the masonry base surface of the central masonry section 2 and the outer peripheral masonry section 3. The insulation layer 5 alleviates local high temperature and deformation of the base plate 1. The material of the insulation layer 5 is specifically selected according to the heat treatment temperature of the silicon steel coil on the furnace platform. The insulation layer 5 is fixed to the masonry base surface.

[0050] like Figures 1-4In another embodiment, at least one of the first brick 211, the third brick 221 and the fourth brick 222 is an arc brick with a central angle of 40-72°. The arc brick is beneficial to further improve the stability of the first brick 211 and the third brick 221, reduce the number of the vertical direction joint surfaces in the furnace table, reduce the number of the possible gaps between the bricks and the heat transferred along the gaps, and reduce the damage probability of the first brick 211 to the outside and the third brick 221 to the extrusion. Further, the first brick 211, the second brick 212, the third brick 221, the fourth brick 222, the fifth brick 31, the sixth brick 32 and the seventh brick 213 are all arc bricks. The bottom brick layer is a standard refractory brick.

[0051] It can be understood that the adjacent bricks are the bricks bonded on both sides of the same mortar, and the pressed bricks are the upper and lower bricks bonded on the same mortar.

[0052] The above description is only the preferred embodiments of the present application, and it should be pointed out that for those skilled in the art, without departing from the technical principles of the present application, a number of improvements and refinements can be made, and these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A heating furnace for annealing silicon steel coils, characterized in that, The application relates to a masonry furnace, which comprises a base plate with a masonry base, a central masonry part with a straight cylindrical outer contour, a bottom brick layer and a top brick layer which are stacked one above another, and a peripheral masonry part which is arranged around the outer periphery of the bottom brick layer. The top brick layer is provided with a heating groove, and the top brick layer comprises a first brick body located at the outer edge, and a second brick body which is arranged adjacent to the first brick body at the center side of the furnace table and is located at the bottom of the heating groove; the bottom brick layer comprises a third brick body located at the outer edge of the central masonry part. The first brick body and the second brick body are partially pressed on the top surface of the third brick body; the top surface of the third brick body is provided with a middle recess, the first brick body is provided with a straight cylindrical protrusion which is matched with the recess; a fourth brick body is arranged adjacent to the third brick body at the side close to the center of the furnace table, and the top end inner edge of the third brick body is provided with an end corner recess, and the fourth brick body is partially filled in the end corner recess. The outer contour of the central masonry part is cylindrical; the edges of the top brick layer are surrounded by a plurality of first brick bodies, and the approaching side surfaces of two adjacent first brick bodies are provided with side surface recesses and side surface protrusions which are spaced from the edges and are matched along the surrounding circumferential direction; the side surface recesses and the side surface protrusions are higher than the straight cylindrical protrusion. The first brick body comprises an integral main body and a straight cylindrical protrusion, and the width of the straight cylindrical protrusion along the radial direction of the furnace table is greater than 1 / 2 of the width of the main body. The bottom brick layer comprises a bottom brick layer and an intermediate brick layer which are stacked one above another, and the third brick body is arranged in the intermediate brick layer. A fifth brick body is arranged adjacent to the bottom brick layer and the bottom end of the third brick body away from the center of the furnace table, and a sixth brick body is arranged adjacent to the fifth brick body away from the center of the furnace table and upwardly on the side, and the fifth brick body, the sixth brick body and the third brick body surround a sand sealing groove. The top surface of the fifth brick body is lower than the bottom surface of the fourth brick body. The outer edge of the peripheral masonry part is provided with a guard ring which is fixedly connected with the base plate.

2. The heating-type furnace table for annealing of a silicon steel coil according to claim 1, characterized by A heat preservation layer is arranged between the bottom brick layer of the central masonry part and the masonry base, or a heat preservation layer is laid on the masonry base of the central masonry part and the peripheral masonry part.

3. The heating-type furnace table for annealing of a silicon steel coil according to claim 2, characterized by At least one of the first brick body, the third brick body and the fourth brick body is an arc brick, and the central angle of the arc brick is 40-72 degrees.

4. The heating-type furnace table for annealing of a silicon steel coil according to claim 3, characterized by ​ 5. The heating-type furnace table for annealing of a silicon steel coil according to claim 1, characterized by ​ 6. The heating-type furnace table for annealing of a silicon steel coil according to claim 1, characterized by ​ 7. The heating-type furnace table for annealing of a silicon steel coil according to claim 1, characterized by ​

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