Continuous heat treatment furnace

Abstract

The utility model relates to a continuous heat treatment furnace (1), which is used for heating an object to be treated while conveying the object to be treated, and is characterized by comprising a first furnace body (2), a second furnace body (3) and a third furnace body (4), and a second furnace body (3) having a flat top. According to the utility model, the continuous heat treatment furnace is provided with the first furnace body and the second furnace body, the first furnace body is provided with the arched top, and the second furnace body is provided with the flat top, so that the continuous heat treatment furnace can adopt a structure suitable for functions required by each area.

Description

Technical Field

[0001] The utility model relates to a continuous heat treatment furnace. Background Art

[0002] All along, as a continuous heat treatment furnace that conveys an object to be processed while performing heat treatment, there are known a continuous heat treatment furnace having a furnace body with an arched top and a continuous heat treatment furnace having a furnace body with a flat top. The furnace body with an arched top is characterized by a stronger top structure and a larger volume inside the furnace compared to the furnace body with a flat top.

[0003] In such a continuous heat treatment furnace, the functions required for each region such as a heating-up region, a soaking region, and a cooling region are different. However, in a conventional continuous heat treatment furnace having only a furnace body with an arched top or only a furnace body with a flat top, it cannot be said that the structure is optimal for each region, so it is disadvantageous in terms of the efficient operation of the continuous heat treatment furnace. Summary of the Utility Model

[0004] Problems to be Solved by the Utility Model

[0005] Therefore, the purpose of the present utility model is to provide a continuous heat treatment furnace capable of adopting a structure suitable for the functions required for each region.

[0006] Technical Solution for Solving the Problems

[0007] To solve the above problems, a first aspect of the present utility model is a continuous heat treatment furnace (1), characterized in that the continuous heat treatment furnace (1) conveys an object to be processed while performing heat treatment, and the continuous heat treatment furnace includes: a first furnace body (2) having an arched top; and a second furnace body (3) having a flat top.

[0008] In addition, for the continuous heat treatment furnace according to the first aspect, in a second aspect of the present utility model, it is characterized in that

[0009] The first furnace body (2) has a first exhaust gas flow path (22) in the arched top.

[0010] In addition, for the continuous heat treatment furnace according to the first aspect, in a third aspect of the present utility model, it is characterized in that

[0011] The arched top has an arch portion (21) formed by combining a plurality of heat insulating bricks, refractory heat insulating bricks, or heat resistant bricks,

[0012] The flat top has a beam portion (31) formed by erecting a beam-shaped ceramic from one furnace side wall (38) to the other furnace side wall (39).

[0013] In addition, for the continuous heat treatment furnace according to the third solution, in the fourth solution of the present utility model, it is characterized in that

[0014] The cross-sectional shape of the beam part when viewed from the side is rectangular or L-shaped.

[0015] In addition, for the continuous heat treatment furnace according to the first solution, in the fifth solution of the present utility model, it is characterized in that

[0016] The second furnace body (3) is provided with a second exhaust gas flow path (32) on the furnace side walls (38, 39).

[0017] In addition, for the continuous heat treatment furnace according to the first solution, in the sixth solution of the present utility model, it is characterized in that

[0018] There is heat-resistant fiber (4) above the arch part (21) and / or the beam part (31).

[0019] In addition, for the continuous heat treatment furnace according to the first solution, in the seventh solution of the present utility model, it is characterized in that

[0020] The continuous heat treatment furnace sequentially includes an inlet, a heating-up region (12), a soaking region (13), and an outlet.

[0021] The heating-up region is constituted by the first furnace body.

[0022] In addition, for the continuous heat treatment furnace according to the first solution, in the eighth solution of the present utility model, it is characterized in that

[0023] The continuous heat treatment furnace sequentially includes an inlet, a heating-up region (12), a soaking region (13), and an outlet.

[0024] The first exhaust gas flow path has a Z-shaped part.

[0025] In addition, for the continuous heat treatment furnace according to the first solution, in the ninth solution of the present utility model, it is characterized in that

[0026] The minimum cross-sectional area of the exhaust gas flow path is 2000 mm 2 As above, the maximum cross-sectional area of the first exhaust gas flow path is 10000 mm 2 Below.

[0027] In addition, for the continuous heat treatment furnace according to the first solution, in the tenth solution of the present utility model, it is characterized in that

[0028] The width of the first furnace body (2) is 480 mm or more and 2510 mm or less.

[0029] Utility model effect

[0030] According to the present utility model, since there are both a first furnace body and a second furnace body, the first furnace body has an arched top, and the second furnace body has a flat top. Therefore, a continuous heat treatment furnace capable of adopting a structure suitable for the functions required in each area can be provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 FIG. 1 is a schematic side view of a continuous heat treatment furnace according to an embodiment of the present utility model.

[0032] Figure 2 FIG. 2 is a cross-sectional view of the first furnace body of the continuous heat treatment furnace viewed from the front direction.

[0033] Figure 3 FIG. 3 is a cross-sectional view of the second furnace body of the continuous heat treatment furnace viewed from the front direction. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0034] Hereinafter, a roller hearth kiln 1 for conveying the saggers S arranged in 6 rows by the conveying rollers 81 will be taken as an example to describe a continuous heat treatment furnace according to an embodiment of the present utility model. In addition, in the present embodiment, an example in which the saggers S are arranged in a single layer is shown, but the saggers S may also be stacked in two or more layers. Heaters 82 and 83 are arranged above and below the conveying rollers 81, and the object to be processed filled in the sagger is heated and processed by the heaters 82 and 83 while being conveyed by the conveying rollers 81.

[0035] As Figure 1 shown, the roller hearth kiln 1 includes: a first furnace body 2 having an arched top; and a second furnace body 3 having a flat top. The roller hearth kiln 1 successively includes an inlet, a heating-up zone 12, a soaking zone 13, and an outlet. Figure 1 FIG. 4 shows an example in which the heating-up zone 12 is composed of a plurality of first furnace bodies 2 and the soaking zone 13 is composed of a plurality of second furnace bodies 3.

[0036] The arched top has an arch portion 21 formed by combining a plurality of heat insulating bricks, refractory heat insulating bricks, or heat resistant bricks into an arch shape. In addition, the flat top has a beam portion 31 formed by bridging a ceramic in a beam shape from one furnace side wall 38 to the other furnace side wall 39. As the material of the beam portion 31, for example, silicon carbide (SiC) can be used. In addition, as the beam portion 31, a shape having a rectangular or L-shaped cross-sectional shape when viewed from the side can be adopted.

[0037] The furnace side walls and the furnace bottom surface of the roller hearth kiln 1 include an inner wall 7 formed of heat insulating bricks, refractory heat insulating bricks, or heat resistant bricks and an outer wall 8 formed of heat insulating plates and heat insulating fibers. Both ends of the beam portion 31 of the second furnace body 3 are supported by the inner wall 7.

[0038] The first furnace body 2 and the second furnace body 3 are respectively provided with a gas supply passage 42 for supplying atmosphere gas into the furnace on the furnace bottom surface. In addition, in Figure 1 the illustration of the gas supply passage 42 is omitted.

[0039] The first furnace body 2 is provided with a first exhaust gas flow passage 22 at the arched top. In addition, the second furnace body 3 is provided with a second exhaust gas flow passage 32 on the furnace side walls 38 and 39. A plurality of first exhaust gas flow passages 22 are connected to one exhaust gas flow passage 25 serving as a main pipe, and the exhaust gas in the heating region 12 is discharged to the outside of the furnace through the first exhaust gas flow passages 22 and the exhaust gas flow passage 25. In addition, a plurality of second exhaust gas flow passages 32 are connected to one exhaust gas flow passage 35 serving as a main pipe, and the exhaust gas in the soaking region 13 is discharged to the outside of the furnace through the first exhaust gas flow passages 22 and the exhaust gas flow passage 25.

[0040] In the heating region 12, sometimes the exhaust gas discharged from the object to be processed is more than that discharged in the soaking region 13. In order to improve the exhaust efficiency, it is preferable to provide an exhaust gas flow passage at the top, but the arched top is disadvantageous in terms of the strength of the top structure. In the roller hearth kiln 1 according to the present embodiment, by adopting the first furnace body 2 having an arched top in the heating region 12, the discharge efficiency of the exhaust gas is improved, and the strength of the top structure is ensured.

[0041] As Figure 1 shown, the first exhaust gas flow passage 22 preferably has a Z-shaped portion. The temperature of the exhaust gas drops near the outlet of the exhaust gas flow passage 25, and foreign matters such as tar may fall onto the exhaust gas flow passage 25. However, by having a Z-shaped portion, the foreign matters can be received by the horizontal portion of the Z-shaped portion, and the fall of the foreign matters into the furnace can be prevented. Therefore, the contamination of the object to be processed by the foreign matters can be prevented.

[0042] In addition, it is preferable that the minimum cross-sectional area of the first exhaust gas flow passage 22 is 2000 mm 2 or more, and the maximum cross-sectional area of the first exhaust gas flow passage 22 is 10000 mm 2 or less. As described above, in the heating region 12, sometimes the exhaust gas discharged from the object to be processed is more than that discharged in the soaking region 13. In order to improve the exhaust efficiency, it is preferable that the exhaust gas flow passage in the heating region 12 is larger than the exhaust gas flow passage in the soaking region 13. In particular, when the saggers S are stacked in multiple layers, the amount of exhaust gas discharged from the object to be processed increases. Therefore, it is important to have an exhaust gas flow passage with a sufficient cross-sectional area. In addition, if the exhaust gas flow passage formed at the top is increased, the structure of the top becomes weak. Therefore, it is preferable that the maximum cross-sectional area of the first exhaust gas flow passage 22 is 10000 mm 2 or less.

[0043] On the other hand, if an arched top is adopted in the soaking zone 13, the volume inside the furnace becomes larger compared to a flat top, so it is necessary to increase the supply amount of the atmosphere gas supplied into the furnace. In addition, generally, the soaking zone 13 is the highest temperature zone of the continuous heat treatment furnace 1. However, if an arched top is adopted in the soaking zone 13, the furnace height becomes higher compared to a flat top, the heat dissipation area increases, and thus the heat dissipation amount increases, which is disadvantageous in terms of energy saving compared to a flat top. By adopting a flat top in the soaking zone 13, it is advantageous in reducing the consumption amount of the atmosphere gas and energy saving.

[0044] The utility model is particularly effective in the case of a continuous heat treatment furnace with a width of 480 mm or more and 2510 mm or less for the first furnace body 2 in consideration of the strength of the arched top.

[0045] In addition, it is preferable to have the heat-resistant fiber 4 above the arch part 21 and the beam part 31. The heat-resistant fiber 4 is lighter than a plurality of heat-insulating bricks, refractory heat-insulating bricks or heat-resistant bricks, so the load applied to the arch part 21 and the beam part 31 can be reduced.

[0046] According to the continuous heat treatment furnace 1 according to the present embodiment, since it includes both the first furnace body 2 and the second furnace body 3, the first furnace body 2 has an arched top, and the second furnace body 3 has a flat top, it is possible to provide a continuous heat treatment furnace that can adopt a structure suitable for the functions required in each region.

[0047] Symbol Explanation

[0048] 1 Continuous heat treatment furnace

[0049] 2 First furnace body

[0050] 3 Second furnace body

[0051] 4 Heat-resistant fiber

[0052] 12 Heating-up zone

[0053] 13 Soaking zone

[0054] 21 Arch part

[0055] 22 First exhaust gas flow path

[0056] 31 Beam part

[0057] 32 Second exhaust gas flow path

[0058] 38 One furnace side wall

[0059] 39 The other furnace side wall.

Claims

1. A continuous heat treatment furnace (1), characterized in that: The continuous heat treatment furnace heats the object to be treated while conveying the object to be treated. The continuous heat treatment furnace comprises: a first furnace body (2) having an arched top; and a second furnace body (3) having a flat top. The arched top has an arch portion (21) formed by combining a plurality of insulation bricks, refractory insulation bricks or heat-resistant bricks into an arch shape. The flat top has a beam portion (31) formed by extending a beam-shaped ceramic from one furnace side wall toward the other furnace side wall. The continuous heat treatment furnace comprises an inlet, a heating area (12), a heat equalization area (13) and an outlet in sequence. The temperature rising area is formed by the first furnace body.

2. The continuous heat treatment furnace according to claim 1, characterized in that: The first furnace body (2) is provided with a first exhaust flow path (22) at the arched top.

3. The continuous heat treatment furnace according to claim 1, characterized in that: The cross-sectional shape of the beam portion when viewed from the side is rectangular or L-shaped.

4. The continuous heat treatment furnace according to claim 1, characterized in that: The second furnace body (3) is provided with a second exhaust flow path (32) on the furnace side wall.

5. The continuous heat treatment furnace according to claim 1, characterized in that: Heat-resistant fibers (4) are provided above the arch portion (21) and / or the beam portion (31).

6. The continuous heat treatment furnace according to claim 2, characterized in that: The first exhaust flow path includes a Z-shaped portion.

7. The continuous heat treatment furnace according to claim 2, characterized in that: The minimum cross-sectional area of ​​the first exhaust flow path is 2000 mm 2 The maximum cross-sectional area of ​​the first exhaust flow path is 10000mm 2 the following.

8. The continuous heat treatment furnace according to claim 1, characterized in that: The width of the first furnace body (2) is greater than or equal to 480 mm and less than or equal to 2510 mm.

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