JP4486934B2 - Seal structure between roller and roller insertion hole in roller hearth kiln - Google Patents

Description

  The present invention relates to a seal structure between the roller and the roller insertion hole in the roller hearth kiln, and more specifically, reduces the cleanliness in the furnace, or the sliding portion of the roller driving unit and the roller receiving unit. The present invention relates to a seal structure that can seal a gap between a roller and a roller insertion hole without causing thermal damage.

  A roller, which is a conveying means for the roller hearth kiln, is inserted into a roller insertion hole provided through the side wall of the furnace and assembled to the furnace body. It is necessary to provide a certain gap between the roller insertion hole and the roller in consideration of the difference in thermal expansion between the roller driving unit and the roller receiving unit and the heat insulating material constituting the side wall and the assembly accuracy. Generally, when the diameter of the roller is about 40 mm, the diameter of the roller insertion hole is about 50 mm, and the difference in diameter between the two is about 10 mm.

  When no seal structure is provided in the gap between the roller and the roller insertion hole, gas flows in and out through the gap inside and outside the furnace. When gas flows from the outside to the inside of the furnace, the temperature distribution in the furnace is adversely affected. On the other hand, when gas flows out of the inside or outside of the furnace, thermal damage occurs outside the furnace. Moreover, when the gas with strong odors, such as a binder component, is diffused from to-be-baked goods, when it flows out, malodor will also leak out of a furnace.

  In order to avoid the occurrence of various problems associated with the inflow and outflow of these gases, conventionally, as shown in FIG. 6, a wool material 31 mainly composed of fiber fibers is provided in the gap between the roller 1 and the roller insertion hole 2. It was common to insert (no prior art document relating to such prior art is found in particular). However, in such a seal structure using the wool material 31, dust is likely to be generated due to friction between the wool material 31 and the roller 1, and it cannot be used for a roller hearth kiln that requires a high cleanliness in the furnace. .

Therefore, as another seal structure, as shown in FIG. 7, a structure has been devised in which the entire gap between the roller 1 and the roller insertion hole 2 is enclosed and sealed with a seal material 41 or a seal plate 42 (for example, (See Patent Document 1). However, in this seal structure, the inside of the sealed portion is likely to become hot due to the movement of the gas in the furnace due to natural convection, heat conduction from the roller 1, etc. Damage may occur and smooth rotation of the roller 1 may not be obtained.
Japanese Patent No. 2804221

  The present invention has been made in view of the above-described problems of the prior art, and the object of the present invention is to reduce the cleanliness in the furnace or to slide the roller driving unit and the roller receiving unit. An object of the present invention is to provide a sealing structure capable of effectively sealing a gap between a roller and a roller insertion hole without causing thermal damage to the roller.

  In order to achieve the above object, according to the present invention, the following seal structure is provided.

[1] A seal structure between a roller and a roller insertion hole in a roller hearth kiln, which is attached to the roller by inserting the end of the roller into a central hole, and rotates in synchronization with the roller A torus-shaped first sheet, a second sheet having a through-hole that is thicker than the first sheet and larger in diameter than the outer diameter of the first sheet, and a through-hole in the second sheet, respectively. The second sheet, the third sheet, and the fourth sheet have the second sheet, the third sheet, and the fourth sheet, respectively. And the center of the through hole of each sheet is fixed to the side wall of the furnace so as to coincide with the center of the roller insertion hole provided on the side wall of the furnace. Seal structure between the outer peripheral portion of the first sheet is disposed between said three sheets fourth sheet, roller and roller insertion hole.

[2] The roller and roller insertion according to [1], wherein the second sheet, the third sheet, and the fourth sheet are each configured to be vertically divided so as to bisect the through-hole. Seal structure between the holes.

  According to the seal structure of the present invention, without reducing the furnace cleanliness of the roller hearth kiln or causing thermal damage to the sliding part of the roller driving part or the roller receiving part, the roller and the roller insertion hole The gaps between them can be effectively sealed.

  Hereinafter, typical embodiments of the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to the following embodiments, and those skilled in the art can depart from the scope of the present invention. It should be understood that design changes, improvements, and the like can be made as appropriate based on general knowledge of the above.

  As described above, the present invention is a seal structure between a roller and a roller insertion hole in the roller hearth kiln, and is configured using four sheets of a first sheet to a fourth sheet.

  FIG. 2 is a schematic plan view of the first sheet. The first sheet 3 is a torus (annular) sheet, and is attached to the roller by inserting the end of the roller into the central hole 4. It is preferable that the diameter of the hole 4 is the same as the diameter of the roller so that there is no gap between the two when the end of the roller is inserted. The first sheet 3 is preferably provided with a notch 5 leading from the outer peripheral portion to the inner peripheral portion in order to facilitate mounting on the roller.

  FIG. 3 is a schematic plan view of the second sheet. The second sheet 6 has a through-hole 7 that is thicker than the first sheet 3 and larger in diameter than the outer diameter of the first sheet 3. This second sheet 6 may be used separately for each roller as a sheet having one through-hole 7, but a plurality of sheets having a plurality of through-holes 7 corresponding to the arrangement pitch of the rollers. It is preferable to provide them integrally with the rollers.

  FIG. 4 is a schematic plan view of a third sheet and a fourth sheet. The third sheet 8 and the fourth sheet 9 each have through-holes 10 and 11 having a smaller diameter than the through-hole 7 of the second sheet 6. The third sheet 8 and the fourth sheet 9 may also be used separately for each roller as a sheet having one through-hole 10 or 11 as in the second sheet. As a sheet having a plurality of through-holes 10 or 11 corresponding to the above, it is preferable to provide the sheet integrally with a plurality of rollers.

  FIG. 1 is a schematic cross-sectional view showing an example of an embodiment of a seal structure of the present invention. In the roller hearth kiln, the roller insertion hole 2 is provided through the side wall of the furnace formed using the heat insulating material 25. By inserting the roller 1 into the roller insertion hole 2, the roller 1 is made into the furnace body. It is assembled. The entire length of the roller 1 is longer than the furnace width, and the end portion protrudes from the side wall. In the seal structure of the present invention, as described above, the first sheet 3 is mounted on the roller 1 by inserting the end of the roller 1 into the central hole of the first sheet 3.

  The second sheet 6, the third sheet 8, and the fourth sheet 9 are used while being overlapped and fixed to the side wall. Specifically, the second sheet 6 is overlapped so as to be sandwiched between the third sheet 8 and the fourth sheet 9, and the center of the through hole of each sheet is the center of the roller insertion hole 2. It is fixed to the side wall of the furnace so as to coincide. For fixing each sheet to the side wall, for example, as shown in FIG. 1, a structural material 21 for fixing the sheet is provided on the side wall of the furnace, and the second sheet 6, the third sheet 8, The four sheets 9 are sandwiched between the side wall and the holding metal fitting 23.

  The outer periphery of the first sheet 3 attached to the end of the roller 1 is disposed between the third sheet 8 and the fourth sheet 9. That is, when the second sheet 6, the third sheet 8, and the fourth sheet 9 are overlapped as described above, a sheet laminated body having a through-hole having a concave cross section on the inner peripheral surface is formed. As a result, the labyrinth seal structure is formed in the gap between the roller 1 and the roller insertion hole 2.

  In addition, as a formation procedure of such a seal structure, first, the third sheet 8 is disposed so as to be in contact with the side wall, and then the second sheet 6 is overlaid on the third sheet 8. Subsequently, the first sheet 3 is mounted on the roller 1 and disposed in the through hole of the second sheet 6. Finally, the fourth sheet 9 is overlaid on the second sheet 6 and narrowed by the holding metal fitting 23. Fix with pressure. By forming in such a procedure, the first sheet 3 having an outer diameter larger than the inner diameters of the through holes of the third sheet 8 and the fourth sheet 9 is interposed between the third sheet 8 and the fourth sheet 9. It can be easily arranged.

  As described above, the thickness of the second sheet 6 is thicker than the thickness of the first sheet 3, and the through hole of the second sheet 6 is larger in diameter than the outer diameter of the first sheet 3. There is a certain gap between the sheet 3 and the second to fourth sheets 6, 8, 9, and the first sheet 3 attached to the end of the roller 1 is Synchronously rotates smoothly.

  The present invention thus uses the first to fourth sheets to form a labyrinth structure in the gap between the roller and the roller insertion hole, and prevents inflow and outflow of gas through the gap. Dust is not generated unlike a seal structure using a wool material, and it can be suitably applied to a roller hearth kiln that requires high cleanliness. Further, unlike the conventional hermetic seal structure, there is no thermal damage to the sliding portions of the roller driving section and the roller receiving section, so that the smooth rotation of the roller is not impaired by the thermal damage.

  Although the material of the 1st-4th sheet | seat used in this invention is not specifically limited, The sheet | seat with the softness | flexibility used for the gasket of the flange for high temperature is suitable.

  In the present invention, the second sheet, the third sheet, and the fourth sheet may have a structure that can be divided vertically so as to bisect each through-hole. In the roller hearth kiln, the product to be fired or the setter for placing the product to be fired may be damaged in the furnace, which may hinder the conveyance of the subsequent fired product. In such a case, it is necessary to remove damaged products and setters as quickly as possible to restore normal transport conditions.However, if the location of the damage is far from the furnace inlet or outlet, However, it is difficult to collect the damaged material from the entrance and the exit, and it takes a lot of time and effort.

  In order to solve such a problem, it is considered that one of effective measures is to make the side wall of the furnace divided into an upper side and a lower side of the roller so that the upper side wall of the roller can be removed. . In other words, if the upper side wall of the roller can be removed, even if the product to be fired or the setter is damaged at a position far from the inlet or outlet, the damaged position can be easily accessed. It can be recovered quickly. In addition, since the structure which supports rollers, such as a roller receiving part, is provided in the lower side wall of a roller, it is very difficult to make it the structure which can remove the whole side wall, and it is not realistic.

  When the above measures are to be taken for a roller hearth kiln to which the seal structure of the present invention is applied, the second sheet, the third sheet and the fourth sheet are each fixed to the side wall around the roller as an integral structure. If it is made, even if the side wall has the above-mentioned divided structure, it is not possible to remove only the upper side wall of the roller. Therefore, as shown in FIG. 5, the second sheet 6, the third sheet 8, and the fourth sheet 9 also have a structure that can be divided vertically so as to divide each through-hole. Of the divided bodies of the second sheet 6, the third sheet 8, and the fourth sheet 9, the lower divided bodies 6b, 8b, 9b are fixed to the lower side wall of the roller, and the upper divided bodies 6a, 8a are fixed. 9a is fixed to the upper side wall of the roller, the upper side wall of the roller can be removed even in the roller hearth kiln to which the seal structure of the present invention is applied.

  As shown in FIG. 5, in the state where the second sheet 6, the third sheet 8, and the fourth sheet 9 are overlapped, one of the dividing surfaces 27 is a convex shape, and the other is a concave shape that fits into it. It is preferable that In this way, when the upper and lower divided bodies are combined, gas can be effectively prevented from entering and leaving between the divided surfaces 27. Such a dividing surface 27 is arranged such that when the second sheet 6, the third sheet 8, and the fourth sheet 9 are overlapped, the dividing position of the second sheet 6 that is an intermediate layer is the third sheet 8 that is an outer layer and The four sheets 9 can be easily formed by shifting them somewhat with respect to the dividing position.

  The present invention can be suitably used as a seal structure between a roller and a roller insertion hole in a roller hearth kiln.

It is a schematic sectional drawing which shows an example of embodiment of the seal structure between the roller of this invention, and a roller insertion hole. It is a schematic plan view of a 1st sheet | seat. It is a schematic plan view of a second sheet. It is a schematic plan view of a third sheet and a fourth sheet. It is a schematic perspective view which shows embodiment which made the 2nd sheet | seat, the 3rd sheet | seat, and the 4th sheet | seat the structure which can each be divided | segmented up and down. It is a schematic sectional drawing which shows an example of the seal structure between the conventional roller and a roller penetration hole. It is a schematic sectional drawing which shows another example of the seal structure between the conventional roller and a roller penetration hole.

Explanation of symbols

1: roller, 2: roller insertion hole, 3: first sheet, 4: hole, 5: notch, 6: second sheet, 7: through hole, 8: third sheet, 9: fourth sheet, 10 : Through-hole, 11: through-hole, 21: structural material, 23: restraining metal fitting, 25: heat insulating material, 27: divided surface, 31: wool material, 41: seal material, 42: seal plate, 51: roller drive Part, 52: roller receiving part.

Claims (2)

A seal structure between a roller and a roller insertion hole in a roller hearth kiln,
A torus-shaped first sheet that is attached to the roller by inserting the end of the roller into a central hole and rotates in synchronization with the roller, and the thickness is thicker than the first sheet. A second sheet having a through hole having a diameter larger than the outer diameter of the sheet, and a third sheet and a fourth sheet each having a through hole having a diameter smaller than the through hole of the second sheet, The two sheets, the third sheet, and the fourth sheet are overlapped so that the second sheet is sandwiched between the three sheets and the fourth sheet, and the center of the through-hole of each of the sheets is , Fixed to the side wall of the furnace so as to coincide with the center of the roller insertion hole provided on the side wall of the furnace, the outer periphery of the first sheet is disposed between the three sheets and the fourth sheet, Roller and roller Seal structure between the insertion hole.   2. The roller according to claim 1, wherein the second sheet, the third sheet, and the fourth sheet each have a structure that can be divided vertically so as to bisect the through-hole. Seal structure.

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