KR20150077313A - Transporting member for heating furnace - Google Patents

Abstract

The purpose of the present invention is to provide a transfer member for a heating furnace having high thermal deformation resistance or thermal shock resistance. To achieve the objective of the present invention, a transfer roller (10) for a heating furnace is formed by integrally stacking a metal pipe (68) with thermal shock resistance and corrosion resistance higher than a ceramic pipe (70), and the ceramic pipe (70) located inside the metal pipe (68), and having thermal deformation resistance higher than the metal pipe (68) by interposing a heat resistant insulating material (72). Damage to the ceramic pipe (70) caused by a thermal shock is interrupted as the heat resistant insulating material (72) suppresses that the thermal shock generated in the metal pipe (68) with thermal shock resistance higher than the ceramic pipe (70) is transferred to the ceramic pipe (70) by supporting a heated object (20). Therefore, the ceramic pipe (70) with thermal deformation resistance higher than the metal pipe (68) is capable of serving as a core material of the metal pipe (68), thereby provided is the transfer roller (10) for a heating furnace with high thermal deformation resistance, corrosion resistance, and thermal shock resistance.

Description

TRANSPORTING MEMBER FOR HEATING FURNACE [0001]

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 enhancing thermal deformation resistance, thermal shock resistance and corrosion resistance of a conveying member for a heating furnace.

BACKGROUND ART Heretofore, a heating furnace carrying member composed of a single member of metal or ceramics has been used as a heating furnace for heat-treating an object to be heated while conveying it while supporting it. However, since the metal has a lower thermal deformation resistance than ceramics and is liable to undergo thermal deformation, that is, cliff-deformation under high temperature, the conveying member for a heating furnace composed of metal can be applied to a heating furnace for heating at a high temperature There was no. Since the ceramics have a higher thermal deformation resistance than metals and are less susceptible to thermal shock than metals even though they are less deformed at high temperatures, the conveying members for heating furnaces, which are made of ceramics, There is a problem that it can not be applied to a heating furnace for heating.

However, in order to constitute a heating furnace carrying member having characteristics required for supporting the object to be heated under high temperature, for example, load-carrying property and heat-resistant deformation property, Two members each of which is constituted as an outer tube and an inner tube have been proposed. For example, the conveying member for a heating furnace described in Patent Document 1 is the one.

The conveying member for a heating furnace described in Patent Document 1 is constituted by an outer tubular member and an inner tubular member sandwiched by the outer tubular member integrally joined by the adhesive to the outer tubular member. The outer tubular member is formed of a mullite material or an alumina material that does not easily damage the object to be heated even when it is brought into contact with the white to yellow heating object and the inner tubular member is not deformed well even when exposed to high temperatures (SiC material) having a thermal expansion coefficient smaller than that of the outer tubular member. Therefore, even when the conveying member for the heating furnace is exposed to a high temperature during the heat treatment, the outer tubular member is not broken by the expansion of the inner tubular member due to the thermal expansion difference.

Japanese Patent Application Laid-Open No. 9-229564

However, the SiC material, which is a kind of ceramics used for the inner tubular member of the heating furnace carrying member, has a lower thermal shock resistance than a metal. In addition, the adhesive interposed between the outer tubular member and the inner tubular member does not reduce the transfer of thermal shock generated in the outer tubular member to the inner tubular member. Therefore, when a conventional heating furnace carrying member in which an inner tubular member is constituted by a member having a low heat shock resistance such as a SiC quality material is used in a heating furnace having a large temperature difference for quickly heating the object to be heated, There has been a problem in that the heating furnace transportation member is damaged by thermal shock applied to the outer tubular member of the heating furnace transportation member due to contact with the object having a relatively large temperature difference.

As described above, the heating furnace carrying members proposed in the past have not all been highly resistant to thermal deformation and high in thermal shock resistance.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a heating furnace carrying member having heat resistance and thermal shock resistance.

That is to say, the gist of the present invention is to provide a heating furnace in which both ends are supported outside the heating furnace in a state where the middle portion in the longitudinal direction is positioned in the heating furnace and the object to be heated is supported in the heating furnace, A conveying member for a heating furnace for conveying a material to be heated, comprising: an outer tubular member made of a material having relatively high thermal shock resistance and corrosion resistance; and an inner tubular member located inside the outer tubular member and made of a material having relatively high heat- Wherein the tubular member is constituted by integrally superposing the tubular member via an intermediate member constituted by a heat-resistant insulating material.

According to the conveying member for a heating furnace of the present invention, the conveying member for the heating furnace for supporting the object to be heated and conveying the object to be heated is constituted by an outer tubular member made of a material having relatively high thermal shock resistance and corrosion resistance, Since the inner tubular member, which is located on the inner side of the member and is made of a material having a relatively high heat distortion resistance, is integrally superimposed via the intermediate member composed of the heat-resistant insulating material, And the thermal shock resistance from the outer tubular member to the inner tubular member is suppressed by the intermediate member composed of the heat-resistant insulating material, so that the inner side of the inner tubular member Breakage due to thermal shock of the tubular member is more disturbed. As a result, the inner tubular member having relatively high heat distortion resistance can function as a core member of the outer tubular member, so that it is possible to provide a heating furnace carrying member having heat resistance and thermal shock resistance.

Preferably, the outer tubular member is made of a heat resistant metal, the inner tubular member is made of ceramics, and the intermediate member is made of a material containing ceramics fibers. Therefore, it is possible to provide a heating furnace carrying member with improved heat distortion resistance and high thermal shock resistance.

Preferably, the outer tubular member is coated with a film of ceramics such as an oxide, a nitride, or a carbide attached with a coating material by a technique such as spraying, sputtering, vapor deposition or the like. Therefore, the durability of the outer tubular member is increased, and attachment or contamination of metal oxide or the like to the object to be heated is prevented.

Preferably, the outer tubular member is mounted on the outer side of the elongate flexible material including the ceramic fibers formed on the outer periphery of the inner tubular member. Therefore, the ceramic fibers are firmly fixed between the inner tubular member and the outer tubular member, so that the deviation or relative displacement between the inner tubular member and the outer tubular member is prevented, so that the heat resistant deformability and thermal shock resistance are high, Thereby providing a furnace carrying member.

Preferably, the outer tubular member is in direct contact with the member to be heated, so that there is no so-called sticking to the object to be heated, reactivity with the member to be heated is low, . In addition, since the inner tubular member functions as a protective tube for protecting the inner tubular member from thermal shock caused by contact with the object to be heated, it has higher heat shock resistance than the inner tubular member. As the material of the outer tubular member, a metal having heat resistance and corrosion resistance such as stainless steel and nickel based alloy, or a refractory metal having at least an outer surface coated with a ceramic for suppressing corrosion is preferably used.

Preferably, the inner tubular member functions as a core member for preventing deformation caused by heat of the outer tubular member due to heat rising at a high temperature in the heating furnace, It is required that it is not deformed well by the heat than the member. Therefore, as the material of the inner tubular member, an inorganic material sintered body such as alumina (Al ₂ O ₃ ), silicon carbide (SiC), or mullite (Al ₆ O ₁₃ Si ₂ ), that is, ceramics is preferably exemplified.

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

Preferably, the intermediate member is adhered so as 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. The intermediate member may be wound around the outer peripheral surface of the inner tubular member so long as the outer tubular member and the inner tubular member are not in contact with each other. For example, the entire outer surface of the inner tubular member may be wound without gaps And a predetermined interval in the longitudinal direction of the inner tubular member, that is, a position where the intermediate member is not wound on the outer peripheral surface of the inner tubular member may be formed. In addition, the resin adhesive does not detach from the intermediate member at the stage where the inner tubular member wound with the intermediate member is sandwiched by the outer tubular member, and disappears when heated to a high temperature in the heating furnace It is acceptable. As the adhesive, a resin adhesive such as an acrylic adhesive is preferably used.

1 is a side view of a continuous conveying type heating furnace having a heating roller conveying roller according to an example of the present invention.
Fig. 2 is a sectional view taken along line II-II of the continuous transport type heating furnace of Fig. 1;
Fig. 3 is an enlarged sectional view for explaining a part of the heating roller for a heating furnace applied to the continuous-transport type heating furnace of Fig.
Fig. 4 is a sectional view taken along line IV-IV of the heating furnace conveying roller in Fig. 3;
5 is a side view for explaining a batch type heating furnace having a heating furnace conveying roller according to another embodiment of the present invention.
Fig. 6 is a sectional view taken along line VI-VI of the batch type heating furnace in Fig. 5;
Fig. 7 is a cross-sectional view taken along the line VII-VII of the batch type furnace of Fig. 6; Fig.
Fig. 8 is an enlarged cross-sectional view showing a heating roller for a heating furnace according to another embodiment of the present invention, which is partially cut in the longitudinal direction and enlarged.
Fig. 9 is a cross-sectional view taken along line IX-IX of the heating furnace conveying roller in Fig. 8. Fig.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, one embodiment of a heating furnace carrying member of the present invention will be described in detail with reference to the drawings.

Example 1

1 is a side view of a continuous conveying type heating furnace 12 including a heating furnace conveying roller 10 according to an embodiment of the present invention. 2 is a sectional view taken along line II-II of the continuous conveying type heating furnace 12 of FIG. The continuous conveying type heating furnace 12 includes a heat insulating material 14 for keeping the inside of the furnace at a high temperature state, a long furnace body 18 composed of a casing 16 covering the heat insulating material 14, A conveying roller 10 for a heating furnace which conveys the furnace body 18 from one longitudinal end portion thereof to the other end while supporting the furnace body 18 and a conveying roller support apparatus (not shown) for rotatably supporting both end portions of the heating furnace conveying roller 10 A roller driving device (not shown) for rotating the heating roller for the heating furnace 10 rotatably supported by the conveying roller support device 22, and a long shape (not shown) for heating the inside of the furnace body 18 to a high temperature And a heater 24 of a heater. The furnace body 18 includes a furnace chamber 26 formed in a tunnel shape by being covered with a heat insulating material 14 at four sides, an inlet 28 and an outlet chamber 30 formed at both ends in the longitudinal direction of the furnace chamber 26, (Not shown) which is driven so that the inlet 28 and the outlet 30 are closed when the conveyance of the water 20 is stopped, that is, when the conveying roller 10 for the heating furnace stops rotating. As shown in detail in Fig. 1, the conveying roller 10 for the heating furnace is installed on the base 32 placed horizontally via the roller driving device. The object to be heated 20 which has undergone the previous process is conveyed to the inlet 28 of the furnace body 18 or heat treatment is performed in the furnace body 26, A transporting belt 36 having a transporting roller 34 for transporting the object 20 transported from the transporting rollers 30 and 30 to the next process is disposed between the transporting roller 10 for heating furnace and the transporting roller 34, 20 are provided on both sides in the longitudinal direction of the continuous conveying type heating furnace 12 such that the contact points between the continuous conveying type heating furnaces 12, 20 are substantially coplanar. The continuous conveying type heating furnace 12 corresponds to the heating furnace of the present invention, and the heating furnace conveying roller 10 corresponds to the heating furnace conveying member of the present invention. The roller driving device has a roller drive motor and an output shaft which are not shown.

The object to be heated 20 conveyed to the inlet 28 of the furnace 26 of the continuous conveying type heating furnace 12 by the transport platform 36 is carried in through the opening 28 with the shutter opened, And the heat treatment is carried out while being conveyed in the direction of the outlet 30 at a predetermined speed while being supported by the conveying roller 10 for the heating furnace. At this time, the object to be heated 20 may be subjected to heat treatment by intermittent conveyance in which the rotation of the conveying roller 10 for the heating furnace is periodically stopped for a predetermined time. The object 20 to be conveyed by the conveying roller 10 for the heating furnace to the vicinity of the exit of the furnace chamber 26 and to which the heat treatment is completed is carried out of the furnace body 18 through the outlet 30 through which the shutter is opened. The heated material 20 carried out is transported to the next process by the transport platform 36. The continuous conveying type heating furnace 12 of the present embodiment is preferably used for a heating process for rapidly heating the object 20 having a large temperature difference from the furnace 26 which has not been subjected to the heat- .

Next, the conveying roller 10 for a heating furnace, which is rotatably supported by the conveying roller support device 22, will be described in detail with reference to Figs. 2 to 4. Fig. FIG. 3 is an enlarged cross-sectional view showing a part of the heating roller for a heating furnace 10 applied to the continuous transport type heating furnace 12 of FIG. 1 cut out in the longitudinal direction thereof. Fig. 4 is a sectional view taken along line IV-IV of the conveying roller 10 for the heating furnace shown in Fig. The furnace body 18 includes a furnace body 18 outside the furnace body 18 and a furnace chamber 26 at predetermined intervals in the longitudinal direction so as to be parallel with each other and with a pair of center lines on both side walls thereof being concentric, And a plurality of pairs of through holes 38 each having a substantially circular cross section and formed so as to penetrate both side walls of the furnace body 18 so as to connect them. The cross section of the furnace body 18 which connects the outside of the furnace body 18 and the furnace chamber 26 at least above the through holes 38 of the both side walls under the same conditions as the through holes 38 is a substantially circular shape And a plurality of pairs of through holes (40).

As shown in Fig. 2, the plurality of heating furnace conveying rollers 10 are arranged in such a manner that both end portions of the conveying rollers 10 are vertically extended in the state of being projected from the respective pairs of through holes 38 of the furnace body 18 And is disposed in the vicinity of the lower end. The plurality of heating furnace conveyance rollers 10 are elongated in the longitudinal direction of the furnace body 18, that is, in the direction orthogonal to the conveyance direction of the object 20, and are arranged in parallel in a direction orthogonal to the conveyance direction They are arranged at regular intervals in a row. The plurality of heaters 24 are fixedly formed in the vicinity of the upper end portion in the vertical direction and the vicinity of the lower end portion in the nosepiece 26 in a state in which both ends of the heaters 24 protrude from the respective pairs of the through holes 40. The plurality of heaters 24 are fixedly formed in a row and in a row at regular intervals in a direction perpendicular to the conveying direction above and below the conveying roller 10 for the heating furnace. Instead of the plurality of heaters 24, a heater on the plate may be used.

The conveying roller support device 22 is constituted by a support column 42 which is erected adjacent to both side walls of the furnace body 18 and a support shaft 42 which is supported by the support columns 42 and which is arranged parallel to the side wall of the furnace body 18 Shaped support plate 46 fixed to the upper surface of the elongated member 44 by being fitted and fixed in a recess formed by recessing in the downward direction while leaving longitudinally opposite side edge portions of the elongated member 44, A plurality of pairs of ball bearings 48 mounted at positions corresponding to extension lines connecting each of a plurality of pairs of through holes 38 in the vicinity of the center in the width direction of the ball bearing 48, And a pair of long supporting shafts 50 supported rotatably by the compensation.

The cylindrical distal end portions 52 of the pair of elongated support shafts 50 are sandwiched in both axial ends of the conveying rollers 10 for cylindrical heating furnaces so that the heating furnace conveying rollers 10 Is rotatably supported. One end of the conveying roller 10 for the heating furnace is connected to the one end of the conveying roller 10 for heating furnace and the central axis of the supporting shaft 50 in the vicinity of the longitudinal center side of the leading end portion 52 of the sandwiching support shaft 50 And a pin 56 is inserted into a pin hole 54 formed in a substantially vertical direction. A sprocket wheel (not shown) formed on the output shaft of the roller driving device and a proximal end 62 of the support shaft 50 on the side where the fin 56 is inserted, A chain 66 is wound around the sprocket wheel 64 formed in the sprocket wheel 64.

The conveying roller 10 for the heating furnace supported rotatably around the axis of the support shaft 50 via the support shaft 50 by the conveying roller support device 22 is supported by the support shaft 50 and the chain 66 to be conveyed by the roller driving motor to convey the object 20 placed on the conveying roller 10 for the heating furnace.

Next, the structure inside the heating roller conveyance roller 10 will be described in detail with reference to Figs. 3 and 4. Fig. The conveying roller 10 for a heating furnace has a metal pipe 68 made of metal having heat resistance and corrosion resistance such as stainless steel and chromium molybdenum steel formed in a cylindrical shape and serving as an outer tubular member, A ceramics tube 70 made of a ceramic such as silicon carbide having a slightly small outer diameter and fitted in the inside of the metal tube 68 and functioning as an inner tubular member and an outer circumferential surface of the ceramic tube 70, Heat-resistant insulating material 72 such as a yarn rope or a heat-resistant cloth which functions as an intermediate member for filling a space between the inner circumferential surfaces of the inner circumferential surface of the inner circumferential surface of the inner circumferential surface of the inner circumferential surface. The heat insulating material 72 is a ceramic tube 70 so that the inner circumferential surface of the metal tube 68 and the outer circumferential surface of the ceramic tube 70 are not in contact with each other so as to suppress the transmission of heat shock generated in the metal tube 68 to the ceramic tube 70. [ And is adhered and fixed by an acrylic adhesive applied to the outer circumferential surface of the ceramic tube 70 in advance. Here, the metal tube 68 has a higher thermal shock resistance than the ceramic tube 70, and the ceramic tube 70 has less thermal deformation, i.e., less clipping deformation, than the metal tube 68. In the heating roller for a heating furnace 10 structured as described above, the heat pipe impacted from the object 20 placed on the heating roller conveying roller 10 is received by the metal pipe 68 having high heat shock resistance, The transmission of the thermal shock to the tube 70 is suppressed by the insulating material. The ceramic tube 70 having a small Cliff deformation functions as a core 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 was formed so as to satisfy the conditions shown in Table 1, and the material and the inner diameter of the outer circumferential surface of the ceramic tube 70, A heat pipe conveying roller 10 from a heat insulating material 72 whose thickness is variously changed so as to fill the gap between the ceramic pipe 70 and the metal pipe 68, Of Test Products Nos. 1 to 4 were prepared and applied to the continuous transport type heating furnace 12. The nickel alloy described as the material constituting the metal tube of the test sample No. 4 is, for example, a solid solution of nickel having a composition of 72 mass% of Ni, 14 to 17 mass% of Cr, and 6 to 10 mass% of Fe Heat resistant alloy. Next, for comparison, a cylindrical ceramic roller (comparative product No. 5) made of silicon carbide SiC and having, for example, an outer diameter of 38 mm and an inner diameter of 24 mm, and a stainless steel roller made of stainless steel and having an outer diameter of 38 mm and an inner diameter of 24 (Comparative article No. 6) having a thickness of 5 mm was produced and applied to the continuous transport type heating furnace 12. The object 20 having a temperature of about 25 占 폚 was continuously fed into the hearth 26 in a continuous conveying type heating furnace 12 set at a heating temperature of 1000 占 폚 for 20 seconds as one cycle. Table 2 shows the states of the respective conveying rollers applied to the continuous conveying type heating furnace 12 when a plurality of cycles are repeated. In Table 2, the number of product cycles of the continuous-transfer-type heating furnace 12 to which the heating furnace conveying roller 10 is applied is 100 cycles, which is the result of two tests with 50 cycles as one test.

As shown in Table 2, in all the EUT Nos. 1 to 4 of the conveying roller 10 for the heating furnace, no clipping deformation was observed under a high temperature condition of 1000 占 폚, No breakage due to thermal shock was caused by contact with the object 20 having a temperature of 900 DEG C or higher. On the other hand, in the comparative product No. 5 ceramic roller, roller breakage caused by thermal shock occurred after 10 cycles elapsed. In the metal roller of the comparative product No. 6, when the temperature of the hearth 26 was raised, the crevice deformation occurred from the point of time when the temperature reached 800 ° C, and the cliff deformation increased at the point of 3 hours at 1000 ° C, . As a result, adjacent metal rollers interfere with each other, making it impossible to convey the object 20 to be heated.

As described above, according to the heating furnace conveying roller 10 of the present embodiment, the heating furnace conveying roller 10 for supporting the heated object 20 and for conveying the object 20 to be heated, The ceramic tube 70 positioned inside the metal tube 68 and the metal tube 68 having higher thermal shock resistance than the ceramic tube 70 and having a higher thermal deformation resistance than the metal tube 68 is integrally formed with the heat- The thermal shock generated by supporting the object 20 is received by the metal tube 68 having a thermal shock resistance higher than that of the ceramic tube 70 and is transferred from the metal tube 68 to the ceramic tube 70 Is inhibited by the heat insulating material 72 of high heat resistance, the damage due to thermal shock of the ceramic tube 70 is hindered. As a result, the ceramic tube (70) having a higher thermal deformation resistance than the metal tube (68) can function as a core of the metal tube (68), thereby providing the heating roller feed roller (10) with heat resistance and thermal shock resistance.

According to the heating furnace transport roll 10 of the present embodiment, the metal pipe 68 is made of stainless steel or nickel alloy shown in Table 1, and the ceramic tube 70 is made of silicon carbide SiC, which is ceramics And the heat insulating material 72 are composed of a yarn rope or a heat-resistant cloth comprising ceramic fibers, it is possible to provide a heating furnace conveying roller 10 which is improved in thermal deformation resistance and high in thermal shock resistance

According to the heating furnace conveying roll 10 of the present embodiment, the yarn rope or the heat resistant cloth, which is a long flexible material that is wound around the outer periphery of the ceramic tube 70 and includes the ceramics fibers adhered by the acrylic adhesive, The ceramic tube 70 and the metal tube 68 are fixed to each other by the heat treatment so that 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 the heating roller feed roller 10 with a more accurate heat resistance and thermal shock resistance.

Example 2

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 embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

5 is a side view for explaining 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 schematic side view of the batch type heating furnace 76 7B is a cross-sectional view taken along the line VII-VII of the batch type furnace 76 in FIG. 6. FIG. The batch type heating furnace 76 includes a furnace body 78 composed of a heat insulating material 14 and a casing 16 covering the heat insulating material 14 and a heating object 80 charged into the furnace body 78, (Not shown), a conveying roller support device (not shown), a conveying roller support device (not shown), and a conveying roller support device (Not shown) that rotatably drives the heating roller for the heating furnace 74, which is rotatably supported by the heating roller 80, in the one direction or the opposite direction, And a heater 24 of a long shape. The furnace body 78 connects the furnace body 78 with the rectangular furnace body 82 and the outside of the furnace body 82 with the inlet of the furnace body 80 to the furnace chamber 82, And an exit port 84 serving as an exit port to the outside of the door 78. The batch type heating furnace 76 is configured to lower the shutter 86 formed by forming the heat insulating material in the form of a plate during the heat treatment of the object to be heated 80 to close the entrance 84, And a shutter elevating device 88 for restricting entry and exit of the heat of the object 80 by lifting the shutter 86 in order to bring the object 80 into and out. 5, the batch conveying type heating furnace 76 is provided on the base 32 and is provided adjacent to one side wall of the furnace body 78 having the inlet / outlet 84, A conveying roller 92 provided on a transport platform 90 used to bring the conveying rollers 80 into the furnace 82 or out of the furnace 82, The contact points of the contact portions are substantially the same.

The heated object 80 carried by the transport platform to the entrance 84 of the batch type heating furnace 76 is carried in through the exit opening 84 opened by the shutter elevating device 88 and heated by the heater 24 Heated and supported by the heating furnace conveying roller 74 to a predetermined position in the furnace 82 maintained at a desired temperature by the heat insulating material 14 and is conveyed by the rotation in one direction. During the heat treatment, the door is closed by the shutter elevating device 88. The heated object 80 after the heat treatment is conveyed in the direction of the exit port 84 by the rotation in the direction opposite to the conveying roller 74 for the heating furnace and is conveyed through the exit port 84 opened by the shutter elevating device 88, (78).

The heating roller conveying roller 74 is inserted in a plurality of pairs of through holes 38 formed through the side wall of the furnace body 78 such that both ends of the conveying roller 74 protrude and the plurality of heating furnace conveying rollers 74 are parallel to each other And are horizontally aligned in a row in a horizontal direction at a predetermined interval with respect to the conveying direction of the object 80 to be heated. Each of the heating roller conveying rollers 74 is rotatably supported at both ends by a conveying roller supporting device 22 (not shown), and is rotatable in both directions around the axis by a roller driving motor .

The conveying roller 74 for the heating furnace has a cylindrical tube 70 formed in a cylindrical shape and a cylindrical tube 68 having an inner diameter larger than the outer diameter of the ceramic tube 70 and a ceramic tube And a heat insulating material 72 that fills the gap generated when the heat sinks 70 are fitted, and has a triple-layer structure. Therefore, similarly to the heating furnace conveying roller 10, the heating furnace conveying roller 74 is a conveying roller for conveying while conveying the object 80 having a large temperature difference from the inside of the heating furnace under a high temperature environment Can be preferably used.

Example 3

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

Although the present invention has been described in detail with reference to the tables and the drawings, the present invention can be carried out in other modes, and various modifications can be added without departing from the scope of the present invention.

For example, the conveying member for the heating furnace of the present invention is the conveying member for the heating furnace of the continuous conveying type heating furnace 12 and the batch type heating furnace 76 in the above described first and second embodiments, ). However, the conveying member for the heating furnace of the present invention is not limited to them, but may be applied, for example, as a conveying beam material for a working beam type heating furnace.

The conveying roller 10 for a heating furnace according to the first embodiment has a proximal end portion of the driving-side support shaft 50 and one end portion of the conveying roller 10 among a pair of support shafts 50 supporting the same, For example, the engagement groove is formed at one end of the conveying roller 10, and the supporting shaft 50 on the driving side is engaged with the pin 56 inserted in the direction perpendicular to the conveying roller 10, A connecting structure in which an elastic body engaging with the fitting groove is fixedly formed so as to connect the one end of the conveying roller 10 and the supporting shaft 50 on the driving side in a relatively non-rotatable manner may be used.

The conveying roller 10 for a heating furnace according to the first embodiment is rotatably supported by a pair of support shafts 50 fitted at both ends of the conveying roller 10. However, A spring for elastically supporting the conveying roller 10 in the direction of the rotational axis may be formed on the conveying roller 10 so as to rotate together with one side of the supporting shaft 50 while permitting thermal expansion and contraction of the conveying roller 10.

10, 74: conveying roller for heating furnace (conveying member for heating furnace)
12: Continuous conveying type heating furnace (heating furnace)
20, 80: The object to be heated
68: Metal tube (outer tubular member)
70: Ceramic pipe (inner tubular member)
72: Insulation material (intermediate member)
76: batch type heating furnace (heating furnace)

Claims (4)

Both ends are supported outside the heating furnace in a state in which the middle portion in the longitudinal direction is positioned in the heating furnace and the heating furnace for supporting the heating target in the heating furnace and for conveying the heating target As a member,
An inner tubular member made of a material having a relatively high thermal shock resistance and a high corrosion resistance and an inner tubular member disposed on the inner side of the outer tubular member and made of a material having a relatively high thermal deformation resistance, Wherein the heating member is superimposed on the heating member. The method according to claim 1,
Wherein the outer tubular member is made of a heat resistant metal,
Wherein the inner tubular member is made of ceramics,
Wherein the intermediate member is made of a material containing ceramics fibers. 3. The method of claim 2,
Wherein the heat resistant metal is ceramic coated on its surface. The method according to claim 2 or 3,
Wherein the outer tubular member is fitted and mounted on the outer side of the elongate flexible material including the ceramic fibers formed on the outer periphery of the inner tubular member.

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