JP6068753B2 - Conveying member for heating furnace - Google Patents

Description

  The present invention relates to a conveying member for a heating furnace that supports an object to be heated in a heating furnace, and more particularly to a technique for increasing the heat distortion resistance, thermal shock resistance, and corrosion resistance of the conveying member for the heating furnace.

  2. Description of the Related Art Conventionally, conveying members for heating furnaces each composed of a single member of metal or ceramic have been used as a material to be conveyed while supporting the object to be heated in a heating furnace for heat-treating the object to be heated. However, since metal is less heat-resistant and deformable than ceramics, it is susceptible to thermal deformation or creep deformation at high temperatures. It was not applicable to the heating furnace. Also, ceramics have higher heat distortion resistance than metals and less creep deformation even at high temperatures. However, because they are less susceptible to thermal shock than metals, the heating furnace transport member made of ceramics has a temperature difference from that in the heating furnace. There is a problem that it cannot be applied to a heating furnace that heats an object to be heated.

  By the way, it is not a single member but a different thermal property because it constitutes a conveying member for a heating furnace that has characteristics required to support an object to be heated at high temperatures, such as load resistance and heat distortion resistance. There has been proposed a double-pipe structure in which two members having a structure are configured as an outer tube and an inner tube, respectively. For example, the conveyance member for heating furnaces described in Patent Document 1 is this.

  The conveying member for a heating furnace described in Patent Document 1 is configured such that an outer tubular member and an inner tubular member fitted into the outer tubular member are integrally joined to each other by an adhesive. The outer tubular member is formed of a mullite material or an alumina material that does not easily pollute the heated object even when it is brought into contact with a white or yellow heated object, and the inner tubular member is deformed even when exposed to a high temperature. It is made of a silicon carbide material (SiC material) that is difficult and has a smaller thermal expansion coefficient than the outer tubular member. Therefore, even if the said heating furnace conveyance member is exposed to high temperature at the time of heat processing, there exists an advantage that an outer tubular member is not divided by expansion | swelling of an inner tubular member by a thermal expansion difference.

JP-A-9-229564

  However, the SiC material which is a kind of ceramic used for the inner tubular member of the heating furnace conveying member has lower thermal shock resistance than metal. Further, the adhesive interposed between the outer tubular member and the inner tubular member does not reduce the transmission of the thermal shock generated in the outer tubular member to the inner tubular member. Therefore, when a conventional heating furnace conveying member in which an inner tubular member is composed of a member having low thermal shock resistance such as a SiC material is used in a heating furnace having a large temperature difference in order to quickly heat an object to be heated. However, there is a problem in that the heating furnace transport member may be damaged by a thermal shock applied to the outer tubular member of the heating furnace transport member due to contact with an object to be heated having a relatively large temperature difference.

  Thus, none of the conventionally proposed heating furnace conveying members have high heat distortion resistance and high thermal shock resistance.

  The present invention has been made against the background described above, and an object of the present invention is to provide a conveying member for a heating furnace having both heat distortion resistance and heat shock resistance.

That is, the gist of the present invention is as follows: (a) A longitudinal shape is formed, and both ends are supported outside the heating furnace in a state where the longitudinal intermediate portion is positioned in the heating furnace. A heating furnace transport member for supporting and heating the object to be heated , and (b) supporting the object to be heated in direct contact with relatively high thermal shock resistance and resistance. An outer tubular member made of a highly corrosive material and an inner tubular member made of a relatively heat-resistant deformable material located inside the outer tubular member are made of a heat-resistant heat insulating material. (C) the outer tubular member is made of a heat-resistant metal, (d) the inner tubular member is made of ceramics, e) The intermediate member is opposed to the outer peripheral surface of the inner tubular member. (F) the outer tubular member is fitted on the outer side of the longitudinal flexible material, and is composed of a longitudinal flexible material including ceramic fibers bonded to the outer peripheral surface of the inner tubular member. It is to be worn .

According to the conveying member for a heating furnace of the present invention, (a) a heating member conveying member for forming a longitudinal shape , supporting the object to be heated and conveying the object to be heated is (b) the object to be heated. The outer tubular member made of a material with relatively high thermal shock resistance and corrosion resistance and located inside the outer tubular member and made of a material with relatively high heat resistance The inner tubular member formed is integrally laminated via an intermediate member made of a heat-resistant heat insulating material , and (c) the outer tubular member is made of a heat-resistant metal, d) The inner tubular member is made of ceramic, and (e) the intermediate member includes ceramic fibers wound around the outer peripheral surface of the inner tubular member and bonded to the outer peripheral surface of the inner tubular member. Composed of a longitudinal flexible material, ( ) Said outer tubular member are those worn fitted on the outside of the elongated flexible material. For this reason, the thermal shock generated by supporting the object to be heated is received by the outer tubular member having relatively high thermal shock resistance, and the thermal deformation resistance is obtained by the inner tubular member, and from the outer tubular member to the inner tubular member. Since the transmission of the thermal shock is suppressed by the intermediate member made of the heat resistant heat insulating material, the inner tubular member is further prevented from being damaged by the thermal shock. Thereby, since the inner tubular member having a relatively high heat resistance can function as a core material of the outer tubular member, it is possible to provide a conveying member for a heating furnace having a high heat resistance and a high heat shock resistance.

Here , preferably, the outer tubular member is coated on the surface with a ceramic film such as oxide, nitride, carbide, etc. to which a coating material is attached using a technique such as spraying, sputtering, or vapor deposition. It is. For this reason, the durability of the outer tubular member is enhanced, and adhesion and contamination of the metal oxide or the like to the object to be heated are prevented.

  Preferably, the outer tubular member is in direct contact with the member to be heated, and therefore has no so-called sticking with the object to be heated, has low reactivity with the member to be heated, and is resistant to corrosion. ing. Moreover, since it functions as a protective tube that protects the inner tubular member from thermal shock caused by contact with an object to be heated, it has a higher thermal shock resistance than the inner tubular member. The material of the outer tubular member is preferably a heat-resistant or corrosion-resistant metal such as stainless steel or nickel-based alloy, or a heat-resistant metal whose outer surface is ceramic-coated at least in order to suppress corrosion. Used.

Preferably, the inner tubular member functions as a core material that prevents the outer tubular member from being deformed due to heat by being heated to a high temperature in a heating furnace. The outer tubular member is required to be less likely to be deformed by heat. Therefore, the material of the inner tubular member is preferably an inorganic material sintered body such as alumina (Al ₂ O ₃ ), silicon carbide (SiC), mullite (Al ₆ O ₁₃ Si ₂ ), that is, ceramics.

  Preferably, the intermediate member suppresses heat exchange generated by the temperature difference between the outer tubular member and the inner tubular member, that is, transmission of thermal shock generated in the outer tubular member to the inner tubular member. Therefore, the thermal conductivity is required to be small. Therefore, as the material of the intermediate member, a rope-like yarn rope made of a heat-resistant material such as ceramic fiber and a cloth-like heat-resistant cloth (ceramics such as silica / alumina) are preferably used.

  Preferably, the intermediate member is bonded to be wound around the outer peripheral surface of the inner tubular member by an adhesive applied to the outer peripheral surface of the inner tubular member. Here, the intermediate member may be wound around the outer peripheral surface of the inner tubular member as long as the outer tubular member and the inner tubular member do not contact each other, for example, the entire outer surface of the inner tubular member The inner tubular member may be wound without a gap, or may be wound so as to provide a predetermined interval in the longitudinal direction of the inner tubular member, that is, a portion where the intermediate member is not wound on the outer peripheral surface of the inner tubular member. The resin adhesive may be heated to a high temperature in a heating furnace as long as the intermediate member does not come off when the inner tubular member around which the intermediate member is wound is fitted into the outer tubular member. It may be one that volatilizes and disappears. As the adhesive, an acrylic resin adhesive or the like is preferably used.

It is a side view of a continuous conveyance heating furnace provided with the conveyance roller for heating furnaces of an example of the present invention. It is II-II sectional view taken on the continuous conveyance heating furnace of FIG. FIG. 2 is an enlarged cross-sectional view illustrating a heating furnace transport roller applied to the continuous transport heating furnace of FIG. FIG. 4 is a sectional view taken along the line IV-IV of the heating roller for the heating furnace in FIG. 3. It is a side view explaining a batch type heating furnace provided with the conveyance roller for heating furnaces of the other Example of this invention. It is VI-VI sectional drawing of the batch type heating furnace in FIG. FIG. 7 is a cross-sectional view of the batch type heating furnace in FIG. It is an expanded sectional view which expands and demonstrates about the conveyance roller for heating furnaces of the other Example of this invention by notching a part in the longitudinal direction. It is IX-IX sectional view of the conveyance roller for heating furnaces in FIG.

  Hereinafter, an embodiment of a heating furnace conveying member of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a side view of a continuous conveyance heating furnace 12 including a conveyance furnace 10 for a heating furnace according to an embodiment of the present invention. 2 is a cross-sectional view of the continuous conveyance heating furnace 12 of FIG. The continuous conveyance heating furnace 12 includes a longitudinal furnace body 18 including a heat insulating material 14 that maintains a high temperature inside the furnace, and a casing 16 that covers the heat insulating material 14, and a furnace body 18 that supports the object to be heated 20. It is rotated by a transport roller 10 for heating furnace that transports from one end of the longitudinal direction to the other end, a transport roller support device 22 that rotatably supports both ends of the transport roller 10 for heating furnace, and a transport roller support device 22. A roller driving device (not shown) that rotationally drives the transporting roller 10 for the heating furnace that is supported, and a longitudinal heater 24 that heats the interior of the furnace body 18 to a high temperature are provided. The furnace body 18 includes a furnace chamber 26 formed in a tunnel shape by being covered by the heat insulating material 14, an inlet 28 and an outlet 30 formed at both ends in the longitudinal direction of the furnace chamber 26, and an object to be heated 20. And a shutter (not shown) that is driven so that the inlet 28 and the outlet 30 are closed when the conveyance of the heating furnace is stopped. As shown in detail in FIG. 1, the heating furnace transport roller 10 is installed on a base 32 placed horizontally via the roller driving device. Further, for example, the object to be heated 20 that has passed through the previous process is transported to the inlet 28 of the furnace body 18, or the object to be heated 20 that has been heat-treated in the furnace chamber 26 and carried out from the outlet 30 of the furnace body 18 is processed in the next process. Continuously conveying type heating furnace is provided with a conveying table 36 equipped with a conveying roller 34 for conveying to the heating furnace conveying roller 10 and the contact point between the conveying roller 34 and the article 20 to be heated. 12 are installed adjacent to both ends in the longitudinal direction. The continuous conveyance heating furnace 12 corresponds to the heating furnace of the present invention, and the heating furnace conveyance roller 10 corresponds to the heating furnace conveyance member of the present invention. The roller driving device has a roller driving motor and an output shaft (not shown).

  The object to be heated 20 transported to the entrance 28 of the furnace chamber 26 of the continuous transport type heating furnace 12 by the transport base 36 is transported through the entrance 28 where the shutter is opened, and the furnace chamber 26 heated to a high temperature by the heater 24. Heat treatment is performed while being transported in the direction of the outlet 30 at a predetermined speed while being supported by the heating furnace transport roller 10. At this time, the object to be heated 20 may be heat-treated by intermittent conveyance in which the rotation of the heating furnace conveyance roller 10 is periodically stopped for a predetermined time. The object to be heated 20 that has been conveyed by the heating furnace conveying roller 10 to the vicinity of the outlet of the furnace chamber 26 and has been subjected to the heat treatment is carried out to the outside of the furnace body 18 through the outlet 30 where the shutter is opened. The object 20 to be heated is transported to the next process by the transport base 36. Moreover, the continuous conveyance heating furnace 12 of a present Example is applied suitably for the heat processing which heats up the to-be-heated material 20 with a large temperature difference with the furnace chamber 26 which has not passed the preheating process in the previous process rapidly, for example. .

  Next, the heating roller transport roller 10 that is rotatably supported by the transport roller support device 22 will be described in detail with reference to FIGS. 2 to 4. FIG. 3 is an enlarged cross-sectional view illustrating a heating furnace transport roller 10 applied to the continuous transport heating furnace 12 of FIG. 4 is a cross-sectional view taken along IV-IV of the heating furnace transport roller 10 in FIG. The furnace body 18 is connected to the outside of the furnace body 18 and the furnace chamber 26 at predetermined intervals in the longitudinal direction so that a pair of centerlines on both side walls are concentric in the vicinity of the center in the vertical direction of both side walls. A plurality of pairs of through-holes 38 having a substantially circular cross section formed through both side walls of the furnace body 18 so as to be connected are provided. The furnace body 18 has a plurality of pairs of through holes 40 having a substantially circular cross section that connects the outside of the furnace body 18 and the furnace chamber 26 under the same conditions as the through holes 38 at least above the through holes 38 on both side walls. It has.

  As shown in FIG. 2, the plurality of heating furnace transport rollers 10 are located in the vicinity of the lower end in the vertical direction of the furnace chamber 26 with both end portions protruding from the plurality of pairs of through holes 38 of the furnace body 18. Has been placed. The plurality of transporting rollers 10 for the heating furnace have a longitudinal shape in the longitudinal direction of the furnace body 18, that is, the direction orthogonal to the transfer direction of the article to be heated 20, and are arranged in a row in parallel in the direction orthogonal to the transfer direction. They are arranged at regular intervals. Further, the plurality of heaters 24 are respectively fixed to the vicinity of the upper and lower ends in the vertical direction in the furnace chamber 26 with both end portions protruding from the plurality of pairs of through holes 40. The plurality of heaters 24 are fixed at regular intervals in a horizontal row in a parallel state in a direction orthogonal to the transfer direction above and below the heating furnace transport roller 10. Instead of the plurality of heaters 24, a plate-like heater may be used.

  The transport roller support device 22 includes a column 42 that is provided in a vertical contact with both side walls of the furnace body 18, and a longitudinal member 44 that is supported by the column 42 and that is disposed parallel and horizontally to the side wall of the furnace body 18. The longitudinal support plate 46 is fixed by being fitted in and fixed to a recess formed by the upper end surface of the longitudinal member 44 being depressed downward leaving both side edges in the longitudinal direction, and the width direction of the support plate 46. A plurality of pairs of ball bearings 48 fitted in positions corresponding to the extended lines connecting the plurality of pairs of through holes 38 in the vicinity of the center, and a longitudinal shape rotatably supported in a cantilever manner by the ball bearings 48. A pair of support shafts 50 are provided.

  The columnar tip portions 52 of the pair of longitudinal support shafts 50 are respectively fitted in both ends of the cylindrical heating furnace transport roller 10 in the axial direction so that the heating furnace transport roller 10 can rotate. It is supported by. And in the one end part of the conveyance roller 10 for heating furnaces, it penetrates to the axial center of the support shaft 50 substantially perpendicularly to the longitudinal direction center side in the front-end | tip part 52 of the support shaft 50 fitted with the one end part. A pin 56 is inserted into the pin hole 54 formed in this manner. Further, a sprocket wheel (not shown) provided on the output shaft of the roller driving device and one end side of the heating furnace transport roller 10, that is, the base end portion 62 of the support shaft 50 on the side where the pin 56 is inserted. A chain 66 is wound around the sprocket wheel 64 provided.

  As a result, the heating furnace transport roller 10 supported by the transport roller support device 22 through the support shaft 50 so as to be rotatable about the axis of the support shaft 50 passes through the support shaft 50 and the chain 66 on one end side thereof. Then, the object to be heated 20 which is rotationally driven by the roller driving motor and placed on the heating furnace transport roller 10 is transported.

  Next, the internal structure of the heating furnace transport roller 10 will be described in detail with reference to FIGS. 3 and 4. The heating furnace conveying roller 10 includes a metal tube 68 made of a metal having heat resistance and corrosion resistance such as stainless steel and chrome molybdenum steel, which functions as an outer tubular member, and an inner diameter of the metal tube 68. A ceramic tube 70 made of a ceramic material such as silicon carbide having a slightly smaller outer diameter than the ceramic tube 70 that is fitted inside the metal tube 68 and functions as an inner tubular member, and the outer peripheral surface of the ceramic tube 70 and the metal tube It is composed of a heat-resistant heat insulating material 72 such as a yarn rope or heat-resistant cloth that functions as an intermediate member that fills the space between the inner peripheral surface of 68 and has a cylindrical and triple layer structure. The heat insulating material 72 prevents the inner peripheral surface of the metal tube 68 and the outer peripheral surface of the ceramic tube 70 from contacting each other so as to suppress transmission of thermal shock generated in the metal tube 68 to the ceramic tube 70. It is wound around the entire outer peripheral surface without any gap and is adhered and fixed by an acrylic adhesive previously applied to the outer peripheral surface of the ceramic tube 70. Here, the metal tube 68 has higher thermal shock resistance than the ceramic tube 70, and the ceramic tube 70 is less deformed by heat, that is, creep deformation than the metal tube 68. In the heating furnace transport roller 10 configured in this manner, the thermal shock from the object to be heated 20 placed on the heating furnace transport roller 10 is received by the metal tube 68 having high thermal shock resistance. Transmission of thermal shock to the ceramic tube 70 is suppressed by the heat insulating material. Further, the ceramic tube 70 having a small creep deformation functions as a core material of the metal tube 68.

[Experimental example]
First, a ceramic tube 70 made of silicon carbide and having an outer diameter of 34 mm and an inner diameter of 24 mm so as to satisfy the conditions of Table 1, the material, the inner diameter, that is, the outer peripheral surface of the ceramic tube 70 and the inner peripheral surface of the metal tube 68. The test tube No. of the transport roller 10 for the heating furnace from the metal tube 68 having variously changed intervals and the heat insulating material 72 having various thicknesses so as to satisfy the interval between the ceramic tube 70 and the metal tube 68. . 1-No. 4 was prepared and applied to the continuous conveyance furnace 12. Test product No. The nickel alloy described as the material constituting the metal tube 4 is, for example, a solid solution strengthened nickel base having a composition of 72% by mass of Ni, 14 to 17% by mass of Cr, and 6 to 10% by mass of Fe. It is a heat resistant alloy. Next, for comparison, for example, a cylindrical ceramic roller (comparative product No. 5) made of silicon carbide SiC and having an outer diameter of 38 mm and an inner diameter of 24 mm, and stainless steel, having an outer diameter of 38 mm and an inner diameter of 24 mm. A metal roller (comparative product No. 6) was prepared and applied to the continuous conveyance furnace 12. In the continuous conveyance heating furnace 12 set at a heating temperature of 1000 ° C., the object to be heated 20 at about 25 ° C. was charged into the furnace chamber 26 for 20 seconds as one cycle, and was continuously conveyed. Table 2 shows the states of the transport rollers applied to the continuous transport heating furnace 12 when a plurality of cycles are repeated. In Table 2, the number of product cycles of the continuous conveyance heating furnace 12 to which the heating furnace conveyance roller 10 is applied is set to 100 cycles, and this is two tests with 50 cycles as one test.

  As shown in Table 2, the test article No. 1-No. In all of the cases, no creep deformation was observed under the high temperature condition of 1000 ° C., and no damage due to thermal shock occurred even when the temperature difference from the furnace chamber 26 was 900 ° C. or more. On the other hand, the comparative product No. In the ceramic roller No. 5, roller breakage due to thermal shock occurred at the time when 10 cycles passed. Comparative product No. In the metal roller No. 6, when the temperature of the furnace chamber 26 was increased, creep deformation occurred from the time when the temperature reached 800 ° C., and the creep deformation increased and deformed greatly after 3 hours at 1000 ° C. As a result, adjacent metal rollers interfere with each other, making it impossible to transport the object to be heated 20.

  As described above, according to the heating furnace transport roller 10 of the present embodiment, the heating furnace transport roller 10 that supports the heated object 20 and transports the heated object 20 is more heat resistant than the ceramic tube 70. A metal tube 68 having a high impact property and a ceramic tube 70, which is located inside the metal tube 68 and has a heat resistant deformation property higher than that of the metal tube 68, are integrally stacked via a heat resistant heat insulating material 72. Therefore, the thermal shock generated by supporting the object to be heated 20 is received by the metal tube 68 having higher thermal shock resistance than the ceramic tube 70, and the thermal shock is transmitted from the metal tube 68 to the ceramic tube 70. Since it is suppressed by the high heat-resistant heat insulating material 72, the ceramic tube 70 is prevented from being damaged by thermal shock. Thereby, since the ceramic tube 70 having higher heat deformation resistance than the metal tube 68 can function as a core material of the metal tube 68, it is possible to provide the heating furnace transport roller 10 having high heat deformation resistance and high heat shock resistance. .

  Further, according to the heating furnace transport roll 10 of the present embodiment, the metal tube 68 is made of stainless steel or a nickel alloy as shown in Table 1, and the ceramic tube 70 is made of silicon carbide SiC, which is ceramic. In addition, since the heat-resistant material 72 is composed of a yarn rope containing ceramic fibers or a heat-resistant cloth, it is possible to provide the heating furnace transport roller 10 that is further improved in heat-resistant deformation and high in heat-resistant shock resistance.

  Further, according to the heating furnace transport roll 10 of the present embodiment, the yarn rope or heat resistant cloth, which is a longitudinal flexible material including ceramic fibers wound around the outer periphery of the ceramic tube 70 and bonded with an acrylic adhesive, is provided. Since the heat treatment is performed with the metal tube 68 fitted on the outside, the yarn rope or the heat resistant cloth is firmly fixed between the ceramic tube 70 and the metal tube 68. Therefore, it is possible to provide a more precise heating roller for a heating furnace that has high heat resistance and high thermal shock resistance.

  Next, another embodiment of the present invention will be described. In the following embodiments, parts that are substantially the same as those in the above embodiments are denoted by the same reference numerals, and detailed description thereof is omitted.

  FIG. 5 is a side view illustrating a batch type heating furnace 76 to which a heating furnace conveying roller 74 according to another embodiment of the present invention is applied, and FIG. 6 is a view of VI-VI of the batch type heating furnace 76 in FIG. FIG. 7 is a cross-sectional view taken along the line VII-VII of the batch heating furnace 76 shown in FIG. The batch-type heating furnace 76 supports a furnace body 78 composed of a heat insulating material 14 and a casing 16 covering the heat insulating material 14, and an object to be heated 80 put in the furnace body 78, and reaches a predetermined position where heat treatment is performed. And a heating roller transport roller 74 that transports in the opposite direction from the predetermined position after heat treatment in one direction and after the heat treatment, a transport roller support device 22 (not shown), and a transport roller support device 22 that are rotatably supported. The heating roller conveying roller 74 is configured to include a roller driving device (not shown) that rotates and drives the heated object 80 in one direction or the opposite direction, and a longitudinal heater 24. The furnace body 78 connects the rectangular parallelepiped furnace chamber 82, the furnace chamber 82, and the outside of the furnace body 78, and transports the object 80 to be heated to the furnace chamber 82 and from the furnace chamber 82 to the outside of the furnace body 78. It has an entrance / exit 84 serving as an exit. In addition, when the batch-type heating furnace 76 heat-treats the object 80 to be heated, the shutter 86 formed of a heat insulating material in a plate shape is lowered to close the inlet / outlet 84 to allow heat to flow in and out of the furnace body 78 and the furnace chamber 82. A shutter lifting / lowering device 88 is provided to suppress and open the entrance / exit by raising the shutter 86 when carrying in / out the object 80 to be heated. As shown in FIG. 5, the batch conveyance heating furnace 76 is installed on the base 32, is installed adjacent to one side wall of the furnace body 78 on the side having the entrance / exit 84, and The contact point between the conveyance roller 92 provided in the conveyance table 90 used for carrying in or out of the furnace chamber 82 and the heated object conveyance roller 74 is substantially the same plane. It is supposed to be.

  The heated object 80 conveyed to the entrance / exit 84 of the batch-type heating furnace 76 by the transport table is carried through the entrance / exit 84 opened by the shutter lifting / lowering device 88, heated by the heater 24, and adjusted to a desired temperature by the heat insulating material 14. While being supported by the heating furnace transport roller 74, it is transported to a predetermined position inside the maintained furnace chamber 82 by rotation in one direction. During the heat treatment, the doorway is closed by the shutter lifting device 88. The object to be heated 80 after the heat treatment is transported toward the entrance / exit 84 by the reverse rotation of the transport roller 74 for the heating furnace, and is carried out of the furnace body 78 through the entrance / exit 84 opened by the shutter lifting / lowering device 88. .

  The heating furnace transport rollers 74 are inserted into a plurality of pairs of through-holes 38 formed through the side walls of the furnace body 78 so that both ends thereof protrude, and the plurality of heating furnace transport rollers 74 are parallel to each other. And it is arranged horizontally in a row at a predetermined interval with respect to the conveying direction of the object 80 to be heated. The both ends of the heating furnace transport roller 74 are rotatably supported by a transport roller support device 22 (not shown), and are driven to rotate in both directions around an axis by a roller drive motor (not shown).

  The heating furnace transport roller 74 includes a ceramic tube 70 formed in a cylindrical shape, a metal tube 68 formed in a cylindrical shape having an inner diameter larger than the outer diameter of the ceramic tube 70, and the ceramic tube 70 fitted into the metal tube 68. It is comprised from the heat insulating material 72 which fills the clearance gap produced when it is formed, and has a triple layer structure. Therefore, like the heating furnace transport roller 10, the heating furnace transport roller 74 is preferably used as a transport roller that transports while supporting a heated object 80 having a large temperature difference from the inside of the heating furnace in a high temperature environment. it can.

  Next, another embodiment of the present invention will be described. FIG. 8 is an enlarged cross-sectional view illustrating a heating furnace support member 94 according to another embodiment of the present invention, with a part cut away in the longitudinal direction. FIG. 9 is a cross-sectional view taken along the line IX-IX of the heating furnace support 94 in FIG. The heating furnace support member 94 includes a cylindrical metal tube 68 as an outer tubular member, a cylindrical ceramic tube 70 as an inner tubular member, and a metal tube, like the heating furnace transport rollers 10 and 74 described above. 68 and a heat insulating material 72 as an intermediate member interposed between the ceramic tube 70 and the ceramic tube 70, and has a triple layer structure. Therefore, like the heating furnace transport rollers 10 and 74, the heating furnace support material 94 can be suitably used as a support material for supporting an object to be heated having a large temperature difference from the inside of the heating furnace in a high temperature environment.

  As mentioned above, although this invention was demonstrated in detail with reference to the table | surface and drawing, this invention can be implemented in another aspect, and can be variously changed in the range which does not deviate from the main point.

  For example, the conveyance member for a heating furnace of the present invention was applied as the conveyance rollers 10 and 74 for the heating furnace of the continuous conveyance type heating furnace 12 and the batch type heating furnace 76 in Example 1 and Example 2 described above. However, the conveyance member for heating furnaces of the present invention is not limited to them, and may be applied as a beam material for conveyance of a walking beam type heating furnace, for example.

  In addition, the conveyance roller 10 for the heating furnace according to the first embodiment is orthogonal to the rotation axis at the base end portion of the drive-side support shaft 50 and the one end portion of the conveyance roller 10 among the pair of support shafts 50 that support the heating roller. For example, an engagement groove is formed at one end of the transport roller 10 and the driving support shaft 50 is engaged with the engagement groove. Another type of connection structure may be used, such as a connection structure in which an elastic body is fixed and the one end of the transport roller 10 and the drive-side support shaft 50 are connected so as not to be relatively rotatable.

  Moreover, although the conveyance roller 10 for heating furnaces of Example 1 was rotatably supported by the pair of support shafts 50 fitted to both ends thereof, one of the pair of support shafts 50 was provided with one of the conveyance rollers 10. A spring that biases the transport roller 10 in the direction of the rotation axis may be provided so as to rotate with one of the support shafts 50 while allowing thermal expansion and contraction.

10, 74: heating furnace transport roller (heating furnace transport member)
12: Continuous conveyance type heating furnace (heating furnace)
20, 80: object to be heated 68: metal tube (outer tubular member)
70: Ceramic tube (inner tubular member)
72: Heat insulation material (intermediate member)
76: Batch heating furnace (heating furnace)

Claims (2)

Both ends are supported outside the heating furnace in a state where the longitudinal intermediate portion is positioned in the heating furnace, the object to be heated is supported in the heating furnace, and the object to be heated is A heating furnace conveying member for conveying,
An outer tubular member made of a material having a relatively high thermal shock resistance and corrosion resistance , which is directly in contact with and supports the object to be heated, and a relatively heat-resistant deformation located inside the outer tubular member The inner tubular member made of a material having high properties is constituted by being integrally stacked via an intermediate member made of a heat-resistant heat insulating material ,
The outer tubular member is made of a heat resistant metal,
The inner tubular member is made of ceramics,
The intermediate member is formed of a longitudinal flexible material including ceramic fibers wound around the outer peripheral surface of the inner tubular member and bonded to the outer peripheral surface of the inner tubular member;
The conveying member for a heating furnace , wherein the outer tubular member is fitted on the outer side of the longitudinal flexible material . The conveying member for a heating furnace according to claim 1 , wherein the surface of the refractory metal is ceramic-coated.

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