JP2008180424A - Fixing method and fixing structure of baffle upper suspension rod of heating furnace - Google Patents

Abstract

A method for fixing an upper suspension rod of a baffle capable of preventing the suspension rod supporting a baffle from being broken even when the baffle and the suspension rod of a heating furnace provided with a baffle are exposed to a high-temperature heating atmosphere and thermally deformed. Provide a fixed structure.
A fixing structure of an upper suspension rod 11 of a baffle 1 is provided on a ceiling 9 of a heating furnace having a through hole 21 for an upper suspension rod of a baffle; An airtightly installed bearing device 22, a locking member 31 attached near the upper end of the upper suspension rod, and an elastic member 35 interposed between the locking member and the upper surface of the bearing device. Thus, the upper suspension rod is attached to the ceiling so as to be elastically movable in the vertical direction.
[Selection] Figure 1

Description

  The present invention relates to a fixing method and a fixing structure for an upper suspension rod of a baffle used in a heat treatment furnace, and more particularly to a fixing method and a fixing structure for a ceiling side of the baffle, and a baffle suspension using the fixing structure.

  For heat treatment of steel pipes and the like, for example, a continuous heating furnace including a baffle 1 having a structure shown in FIG. 3 is often used. In this type of heating furnace, the steel pipe S is inserted from the entrance side of the furnace, heated while being moved inside the furnace by the transfer device 2, and extracted outside the furnace by the extraction device 3. In this apparatus, it is important that the member to be heated (steel pipe S) is heated uniformly and efficiently while the steel pipe or the like moves in the furnace. In order to achieve this object, the baffle 1 is suspended from the ceiling 7 of the heating furnace, and the combustion heat of the direct fire type burner 4 is blown out from the circulation fan 5 provided on the upper part of the baffle 1.

  As shown in FIG. 4, the baffle 1 is suspended and fixed to a ceiling plate 9 of a ceiling 7 of a heating furnace by a suspension rod 8 that is secured and suspended by welding or the like. The suspension rod 11 and the lower suspension rod 12 are connected by a rotating joint 10, and the joint mechanism 13 and the length adjustment mechanism 14 are added to the suspension rod 8 and the baffle 1 is distorted. Is planned.

  However, with the operation of the heating furnace, it is natural that the baffle 1 and the suspension rod 8 are exposed to a high-temperature heating atmosphere. Therefore, at the beginning of construction, the addition to the suspension rod 8 is equal, and the baffle 1 is distorted. However, as a result of long-term use, the suspension rod 8 may break due to thermal deformation of the baffle body or the suspension rod 8, or the support portion of the suspension rod 8 may be damaged. Accidents such as the baffle 1 falling. Further, in the fixing structure of the upper suspension rod 11 shown in FIG. 4, the welded portion 6 of the upper suspension rod 11 to the ceiling plate 9 corrodes due to condensation of sulfuric acid in the furnace atmosphere and causes the suspension rod to drop off. There was also.

Patent Document 1 discloses a heat treatment furnace provided with a baffle, particularly a heat treatment furnace that enables a circulating atmosphere having a predetermined flow rate to be ejected from the baffle in the furnace width direction.
JP-A-11-248361

  However, the invention described in Patent Document 1 only describes that the perforated plate is installed in the baffle with respect to the structure of the baffle, and does not touch on the deformation or dropping of the suspension rod that supports the baffle. In light of the above background, the present invention provides a baffle capable of enhancing the durability of the suspension rod that supports the baffle even if the baffle and the suspension rod of the heating furnace provided with the baffle are exposed to a high-temperature heating atmosphere and thermally deformed. It is an object of the present invention to provide a fixing method and a fixing structure for the upper suspension rod.

  The method of fixing the upper suspension rod of the baffle according to the present invention is such that the upper suspension rod of the baffle protrudes from the top of the ceiling plate through the ceiling of the heating furnace, and the upper suspension rod is connected to the upper surface of the ceiling with the upper surface of the ceiling. It is supported by a bearing device installed with a hermetically sealed gap, and a locking member is attached near the upper end of the upper suspension rod, and the upper suspension rod is disposed between the engagement member and the ceiling plate. The suspension rod is attached to the ceiling via an elastic member, or the suspension bar is attached to the bearing device via an elastic member disposed between the locking member and the upper surface of the bearing device.

  The above invention comprises a ceiling of a heating furnace having a through hole for an upper suspension rod of a baffle, a bearing device coaxially installed with the through hole and airtightly installed on the ceiling upper surface side of the heating furnace, It consists of a locking member attached in the vicinity of the upper end, and an elastic member interposed between the locking member and the upper surface of the bearing device, and the upper suspension rod can be elastically moved in the vertical direction with respect to the ceiling. This can be achieved by utilizing a fixing structure of the upper suspension rod of the baffle attached to the baffle.

A baffle hanger can be obtained using the fixing structure of the upper suspension rod of the baffle.

  According to the present invention, in a heating furnace equipped with a baffle, the durability of the suspension rod supporting the baffle that is thermally deformed when the baffle and the suspension rod are exposed to a high-temperature heating atmosphere can be improved. It can be expected to improve by -30%. Moreover, since the fixing structure of the baffle upper suspension rod according to the present invention does not involve a welding operation for the attachment to the ceiling plate, the maintenance / inspection and replacement thereof are easy, and the maintenance cost can be reduced.

  FIG. 1 is a schematic view showing the internal structure of a continuous heating furnace to which the present invention is applied, and the upper structure of the upper suspension rod of the baffle according to the present invention is shown in the upper part of the figure.

  As shown in FIG. 1, in the fixing structure of the upper suspension rod of the baffle according to the present invention, a through hole 21 is opened in the ceiling 7 and the ceiling plate 9 of the heating furnace. The bar 11 can move up and down.

  A bearing device 22 is attached to the ceiling plate 9 coaxially with the through hole 21. This bearing device incorporates a bearing portion 23 inside, and is fixed and stored in a bearing box 24. The upper suspension rod 11 can smoothly move up and down in the interior thereof. The lower surface side of the bearing box 24 is attached to the ceiling plate 9 by welding, for example. In addition, a seal member 25 that hermetically seals between the upper suspension rod 11 and the bearing housing 24 is installed at the lower portion of the bearing portion 23. A bearing retainer 26 is disposed on the upper portion of the bearing portion 23 and is fixed to the bearing box 24 by, for example, screws. With this configuration, the upper suspension bar 11 can project its upper part outward from the upper part of the heating furnace while maintaining a gas tight state from the inside of the heating.

  In this way, the locking member 31 is attached in the vicinity of the top of the upper suspension bar 11 protruding outward from the upper part of the heating furnace. For this attachment, an elastic member 35, for example, a coil spring, is interposed between the upper surface of the bearing box 24 and the lower surface of the locking member 31. As the locking member 31, for example, a nut 32 is used, and the object can be achieved by screwing the nut 32 to the tip portion of the upper suspension rod 11. In addition to the nut 32, a locking nut 33 can also be attached.

  The lower suspension rod 12 is attached to the upper suspension rod 11 fixed to the ceiling by the above-described fixing structure via the rotary joint 10 and the baffle 1 is further attached to the lower suspension rod 12 in the same manner as the conventional example. . In order to attach the baffle 1 to the lower suspension rod, the joint mechanism 13 is used, and the baffle 1 is attached in a balanced manner using the length adjustment mechanism 14 according to the strain of the baffle shape, etc. is there.

  In the present invention, since the baffle 1 is attached to the suspension rod 8 using the above-described fixing structure of the upper suspension rod, the baffle 1 is distorted with the operation of the heating furnace, or the suspension rod 8 is locally expanded and contracted to be distorted. Even if it occurs, the strain is absorbed by the elastic member (spring) 35 incorporated in the fixed structure. As a result, the load applied to the suspension rod 8 can be maintained evenly over a long period of time, and the durability of the suspension rod 8 can be increased, and consequently the maintenance / inspection pitch of the heating furnace can be increased. .

Further, in the fixing structure of the upper suspension rod according to the present invention, the suspension rod 8 is attached so as to be able to move up and down in the through-hole 21 that penetrates the ceiling 7 and the ceiling plate 9. Maintenance time and inspection time can be greatly reduced, such as no need to stop.

  In addition, although basic embodiment of this invention was described above, unless it deviates from the technical idea of this invention, it can deform | transform into various forms. For example, as shown in FIG. 2, the diameter of the locking member 31 (nut 32) can be enlarged, and an elastic member (spring) 35 can be interposed between the vicinity of the periphery and the ceiling plate 9.

It is a schematic diagram which shows the internal structure of the continuous heating furnace which has the fixing structure of the upper suspension rod of the baffle which concerns on this invention. It is a schematic diagram which shows the internal structure of the continuous heating furnace which has another fixing structure of an upper suspension rod. It is a schematic diagram which shows the internal structure of the continuous heating furnace to which this invention is applied. (a) is a front view, (b) is an AA arrow view. It is a BB arrow sectional view of Drawing 3.

Explanation of symbols

1: Baffle
2: Transfer device
3: Extraction device
4: Direct fire type burner
5: Circulation fan
6: Welded part
7: Ceiling
8: Hanging rod
9: Ceiling board
10: Rotating joint
11: Upper hanging rod
12: Lower hanging rod
13: Joint mechanism
14: Length adjustment mechanism
21: Through hole
22: Bearing device
23: Bearing
24: Bearing box
25: Seal member
26: Bearing presser
31: Locking member
32: Nut
33: Locking nut
35: Elastic member

Claims (3)

  A bearing device is provided by penetrating the ceiling of the heating furnace so that the upper suspension rod of the baffle protrudes from the top of the ceiling plate, and the upper suspension rod is hermetically sealed between the upper surface of the ceiling and the upper surface of the ceiling. Whether the suspension member is supported and a locking member is attached near the upper end of the upper suspension rod, and the upper suspension rod is attached to the ceiling via an elastic member disposed between the engagement member and the ceiling plate. Alternatively, the upper suspension rod fixing method of the baffle, wherein the suspension rod is attached to the bearing device via an elastic member disposed between the locking member and the upper surface of the bearing device. A ceiling of the heating furnace having a through hole for the upper suspension rod of the baffle, a bearing device coaxially installed with the through hole and airtightly installed on the upper surface side of the ceiling of the heating furnace, and mounted near the upper end of the upper suspension rod A locking member, and an elastic member interposed between the locking member and the upper surface of the bearing device,
A structure for fixing an upper suspension rod of a baffle, wherein the upper suspension rod is attached so as to be elastically movable in a vertical direction with respect to a ceiling.   A lifting device for a baffle comprising the fixing structure for an upper suspension rod according to claim 2.

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