JP2021162226A - Roller conveyance-type heating furnace - Google Patents

Abstract

To provide a roller conveyance-type heating furnace capable of easily mounting a muffle in a furnace body.SOLUTION: A roller conveyance-type heating furnace 10 includes a metallic muffle 24 integrally formed to cover a conveyance case 16 for housing a heated object and a conveyance roller 12 in a furnace internal space 42, and also to cover both end portions of the conveyance roller 12 projecting from side walls 14a at the outside of the furnace body 14. The furnace body 14 is divided into a lower furnace body 46 and an upper furnace body 48, and the upper furnace body 48 is placed on the lower furnace body 46 through a part of the muffle 24. Thus the muffle 24 having a width dimension larger than the furnace body 14 can be easily mounted in the furnace body 14. Further as the conveyance roller 12 is covered by the muffle 24 even at its lower side, a heat insulation material such as refractory brick and ceramic fiber is not exposed to a heating chamber 50a in the furnace body 14, and a heating atmosphere of a low dew point required in heat treatment of the heated object can be obtained.SELECTED DRAWING: Figure 3

Description

The present invention relates to a roller transport type heating furnace capable of heat-treating an object to be heated at a low dew point.

A furnace body having a tunnel-shaped furnace chamber and a plurality of transfer rollers arranged in the longitudinal direction of the furnace body in a state parallel to each other through a plurality of through holes formed in the side wall of the furnace body are provided. , A heating furnace is known in which heat treatment is performed on an object to be heated on a plurality of transfer rollers by rotationally driving the plurality of transfer rollers. This heating furnace is a so-called roller hers kiln, and is described in, for example, Patent Document 1.

By the way, there are cases where it is required to perform a heat treatment for dehydrating an object to be heated, such as a solid electrolyte used in an all-solid-state battery, in an atmosphere having a low dew point. However, in the heating furnace described in Patent Document 1, it is difficult to create an atmosphere with a low dew point because the inside of the furnace communicates with the outside through an entrance and exit, and the object to be heated is heat-treated in an atmosphere with a low dew point. It was difficult to apply.

On the other hand, it is conceivable to install an opening / closing shutter at the entrance / exit of the furnace body to shut off the inside of the furnace from the atmosphere. For example, the heating furnace described in Patent Document 2 is that. According to such a heating furnace, the dew point can be lowered to some extent, but there is a problem that an atmosphere having a sufficiently low dew point required for heat treatment of the object to be heated cannot be obtained.

In this regard, it is conceivable to use a muffle (partition wall) in which the upper side of the transport surface on the transport roller is covered with a metal plate, and heat-treat the object to be heated on the transport roller in an atmosphere with a low dew point. In such a heating furnace, it may be possible to heat-treat in an atmosphere with a certain low dew point, but under the transport roller, heat insulating materials such as refractory bricks and ceramic fibers are exposed in the furnace. Since it is difficult to remove the moisture contained in the heat insulating material, it is not possible to sufficiently obtain an atmosphere having a sufficiently low dew point, for example, −30 ° C. or lower, which is required for heat treatment of the object to be heated. Therefore, it is conceivable to further cover the lower side of the transport surface on the transport roller with a metal plate and heat-treat the object to be heated on the transport roller in an atmosphere of a low dew point.

Japanese Unexamined Patent Publication No. 2014-04566 JP-A-2007-187398

However, if the muffle is integrally configured so as to cover the object to be heated on the transfer roller from above and below the transfer roller as described above, it becomes necessary to cover both ends of the transfer roller protruding to the outside of the furnace, and the muffle is the same. It was difficult to install the muffle in the furnace because a part of the muffle protruded out of the furnace and had a width larger than that of the furnace.

The present invention has been made in the background of the above circumstances, and an object of the present invention is to provide a roller transport type heating furnace in which a muffle can be easily installed in a furnace body.

As a result of various studies to solve the above problems, the present inventor divides the furnace body into upper and lower parts, constitutes the furnace body from the lower furnace body and the upper furnace body, and puts the furnace body on the lower furnace body. It was found that the muffle can be easily installed in the furnace by placing the upper furnace with the muffle in between. The present invention has been made based on this finding.

That is, the gist of the present invention is (a) a gap between the furnace body in which the space inside the furnace body for accommodating the object to be heated is formed and the furnace body in the longitudinal direction in a state parallel to each other through the side wall of the furnace body. A plurality of transfer rollers arranged so as to be separated from each other and a roller support device for rotatably supporting both ends of the transfer roller protruding from the side wall of the furnace body are provided, and the transfer rollers are rotationally driven. A roller transport type heating furnace in which the object to be heated on the transfer roller is transported between a heating position inside the furnace and a non-heating position outside the furnace body to heat the object to be heated. b) It has an opening through which the object to be heated is passed, covers a transfer case for accommodating the object to be heated and the transfer roller for transporting the transfer case in the space inside the furnace, and the furnace outside the furnace body. It is provided with a metal muffle integrally formed so as to cover both ends of the transport roller protruding from the side wall of the body. (C) The furnace body is divided into a lower furnace body and an upper furnace body, and (d). ) The upper furnace body is placed on the lower furnace body via the muffle.

According to the roller transport type heating furnace of the present invention, the transport case having an opening through which the object to be heated is passed and accommodating the object to be heated in the space inside the furnace and the transfer roller for transporting the transfer case. The furnace body is provided with a metal muffle integrally formed so as to cover both ends of the transport roller protruding from the side wall of the furnace body outside the furnace body, and the furnace body is a lower furnace body and an upper furnace body. It is divided into bodies, and the upper furnace body is placed on the lower furnace body via the muffle. As a result, a muffle having a width larger than that of the furnace body can be easily installed in the furnace body.

Here, preferably, the muffle has a main case for accommodating the object to be heated and the central portion of the transfer roller inside the furnace body, and a pair of sub-cases for accommodating both ends of the transfer roller outside the furnace body. The lower furnace integrally includes a case and a connecting case that houses a part of the plurality of transport rollers passing through the side wall of the furnace body and connects the main case and the sub case. The body has a bottom wall and a lower side wall that rises from the side end of the bottom wall, and the upper furnace body has an upper wall and an upper side wall that rises from the side end of the upper wall. The upper side wall of the furnace body is placed on the lower side wall of the lower furnace body via the connecting case. As a result, the furnace is provided with a muffle that integrally includes a pair of sub-cases that house both ends of the transport roller outside the main case and the furnace body, and a connecting case that houses a part of the transport roller that passes through the side wall of the furnace body. It can be easily installed in the body. Further, since both ends of the transport roller are covered with muffles, a heating atmosphere having a low dew point required for heat treatment of the object to be heated can be obtained.

Further, preferably, the connecting case is arranged between the lower plate and the upper plate arranged in parallel with each other with a space for passing the transfer roller, and between the lower plate and the upper plate. It includes a plurality of support plates that support the upper plate. As a result, the connecting case can support the load of the upper furnace body while being sandwiched between the lower furnace body and the upper furnace body. As a result, the roller transfer type heating furnace becomes smaller.

Further, preferably, the roller support device is fitted to a support member fastened to the sub-case via a sealing heat insulating sheet and an end portion of the transport roller in the sub-case to form the transport roller. Includes a plurality of support shafts having a tip portion supporting the end portion of the device and a base end portion rotatably supported by the support member via a bearing, and arranged concentrically with the transfer roller. As a result, the support member that rotatably supports the support shaft that supports the transport roller via the bearing is fastened to the sub-case via the sealing heat insulating sheet, so that the support member and the sub-case are sealed. Is enhanced to obtain a heating atmosphere with a low dew point. In addition, the temperature rise of the bearing is suppressed and the durability is improved.

Further, preferably, the support member is formed with a through hole for fitting the bearing and accommodating the base end portion of the support shaft, and the inner circumference of the through hole on the furnace body side with respect to the bearing. An annular seal ring is interposed between the surface and the outer peripheral surface of the support shaft. As a result, the space inside the sub-case, that is, the muffle is shielded from the atmosphere by the seal ring, so that a heating atmosphere having a low dew point required for heat treatment of the object to be heated can be obtained.

Further, preferably, the base end portion of the support shaft protrudes from the through hole formed in the support member in a direction away from the furnace body, and a sprocket is attached to the support shaft. The shaft is rotationally driven. As a result, the support shaft for supporting and driving the transfer roller is driven at a position away from the furnace body, so that durability can be obtained.

Further, preferably, the main case has a longitudinal shape in the transport direction of the object to be heated by the transport roller, and the sub case and the connecting case also have a longitudinal shape in the transport direction of the object to be heated. ing. This has the advantage that the entire transport roller is housed at once and the structure of the muffle is simplified.

It is a side view which shows the roller transfer type heating furnace of one Example of this invention. It is a top view which shows the roller transfer type heating furnace of FIG. It is a figure which shows the III-III sectional view of FIG. FIG. 3 is an enlarged cross-sectional view showing a roller support device in the roller transport type heating furnace of FIG. It is a side view which shows the muffle provided in the roller transport type heating furnace of FIG. 1 by cutting out the side wall of the secondary case of the muffle.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. In the following examples, the drawings explain the main parts related to the invention, and the dimensions, shapes, and the like are not necessarily drawn accurately.

FIG. 1 shows a side surface of a roller transport type heating furnace 10 (hereinafter, referred to as a heating furnace 10) according to an embodiment of the present invention. FIG. 2 is a plan view of the heating furnace 10 as viewed from above. In FIGS. 1 and 2, the heating furnace 10 is, for example, in an atmosphere of an inert gas such as nitrogen gas having a low dew point such as −30 ° C. or lower, preferably −76 ° C. or lower, and more preferably −100 ° C. or lower. By heating to about 80 ° C. to 100 ° C., the mixture is conveyed into the muffle 24 in the furnace body 14 by a plurality of transfer rollers 12 arranged in the longitudinal direction of the heating furnace 10 into the transfer case (container) 16. The filled object to be heated, for example, a solid electrolyte is dehydrated. The heating furnace 10 has a longitudinal shape in the transport direction of the plurality of transport rollers 12.

The heating furnace 10 is supported by a frame 18, and the transport case 16 is filled with a powdery object to be heated in a low dew point atmosphere, or the object to be heated after heat treatment (dehydration) is taken out from the transport case 16. The work room 22, which is airtight for the work of sealing the bag and has a low dew point by being supplied with nitrogen gas, airtightly closes the opening 20 formed in the muffle 24 for passing through the transport case 16. It is airtightly connected to one end of the heating furnace 10 via a possible shielding shutter 26. The work room 22 is provided with, for example, a wall to which work gloves are airtightly attached, and the worker is configured to perform the above work using the gloves.

The heating furnace 10 has a longitudinal shape in the transport direction by the transport roller 12, that is, in the left-right direction of FIGS. 1 and 2, and includes a furnace body 14 and an airtight muffle 24 made of metal, for example, a refractory metal such as stainless steel. ing. The muffle 24 is covered with a furnace body 14 in a part in the longitudinal direction, that is, the left half of FIGS. 1 and 2.

On the upper surface of the furnace body 14, there is an exhaust pipe 28 for exhausting from the space between the muffle 24 and the furnace body 14, an exhaust pipe 30 for exhausting from the inside of the muffle 24, and between the muffle 24 and the furnace body 14. In the temperature detection tube 31 for charging the thermocouple for detecting the temperature, the temperature detection tube 32 for charging the thermocouple for detecting the temperature in the muffle 24, and in the muffle 24 for analyzing the gas in the muffle 24. Gas suction pipes 34, 36, and 38 for sucking gas from three locations separated in the width direction are provided.

FIG. 3 shows a cross section of the heating furnace 10, and FIG. 4 shows an enlarged view of the circumference of the roller support device 44 that supports both end portions 12b of the transfer roller 12, which are the main parts of the cross section of the heating furnace 10. ing. Further, FIG. 5 is a view showing the side surface of the muffle 24 by cutting out the side wall 52b of the sub-case 52.

As shown in FIG. 3, the furnace body 14 is composed of a heat insulating material such as ceramic fiber, and the furnace body 14 contains a muffle 24 for accommodating a transport case 16 filled with an object to be heated, and a furnace. A space 42 inside the furnace is formed to accommodate the upper heater 40 and the lower heater 41 that are long in the width direction.

The transfer roller 12 is a metal tube made of heat-resistant metal such as stainless steel or a tube made of ceramic, and is arranged horizontally at predetermined intervals in the longitudinal direction of the furnace body 14 in a state parallel to each other through the side wall 14a of the furnace body 14. It is installed. Both end portions 12b of the transport roller 12 project from the side wall 14a of the furnace body 14, and are supported in the muffle 24 by a roller support device 44 fixed to the outside of the muffle 24.

The furnace body 14 has a U-shaped (U-shaped) cross-section lower furnace body 46 having a pair of lower side walls 46b rising from the bottom wall 46a and the side edge edges of the bottom wall 46a, and the sides of the upper wall 48a and the upper wall 48a. It is composed of an upper furnace body 48 having a U-shaped cross section (U-shape) having an upper side wall 48b that rises from the edge. The upper side wall 48b of the upper furnace body 48 is placed on the lower side wall 46b of the lower furnace body 46 via the connecting case 54 of the muffle 24. The lower furnace body 46 and the sub-case 52 of the muffle 24 are supported by the frame 18 shown in FIG.

As shown in FIG. 3, the muffle 24 integrally includes a longitudinal main case 50, a pair of longitudinal sub-cases 52, and a connecting case 54. The longitudinal main case 50 accommodates the transport case 16 filled with the object to be heated inside the furnace body 14 and the central portion 12a of the transport roller 12. The pair of longitudinal sub-cases 52 accommodate both ends 12b of the transport roller 12 outside the furnace body 14. The connecting case 54 accommodates a part of a plurality of transport rollers 12 passing through the side wall 14a of the furnace body 14, that is, between the lower side wall 46b and the upper side wall 48b, and airtightly connects the main case 50 and the sub case 52. do.

Further, as shown in FIG. 1, the muffle 24 further includes a shielding shutter 26 and a heat insulating shutter 56 integrally. The shielding shutter 26 makes it possible to airtightly close the opening 20 formed on one end side of the main case 50 on the work room 22 side. The heat insulating shutter 56 is provided on one end side of the main case 50 on the work chamber 22 side, and is out of the heating chamber 51a surrounded by the furnace body 14 in the space in the main case 50 and the space in the main case 50. It is divided into a spare chamber 51b detached from the furnace body 14 of the above, and the heating chamber 51a is thermally shut off.

The shielding shutter 26 has an opening / closing plate 26a for opening / closing the opening 20 formed on the work chamber 22 side of the main case 50, a vertical guide 26b for guiding the opening / closing plate 26a in the vertical direction, and an opening / closing position of the opening / closing plate 26a. It is provided with a vertical actuator 26c that is selectively positioned in and. The heat insulating shutter 56 includes a heat insulating plate 56a that opens and closes the heating chamber 51a, a vertical guide 56b that guides the heat insulating plate 56a in the vertical direction, and a vertical actuator 56c that selectively positions the heat insulating plate 56a in an open position and a closed position. Is equipped.

As shown in FIG. 5, the connecting case 54 includes a lower plate 54a and an upper plate 54b and a lower plate 54a arranged in parallel and horizontally with a space for passing a plurality of transport rollers 12 in the vertical direction. It is composed of a plurality of support plates 54c provided in the vertical direction arranged between the transfer rollers 12 and between the upper plates 54b. As shown in FIGS. 3 and 4, the plurality of support plates 54c function as support walls for supporting the load of the upper furnace body 48 applied to the upper plate 54b of the connecting case 54.

As shown in FIG. 4, the roller support device 44 is arranged concentrically with the support member 60 integrally fastened to the side wall 52b of the sub-case 52 via the sealing heat insulating sheet 58 and the transfer roller 12. It is provided with a plurality of support shafts 64.

The support shaft 64 is fitted into the end portion 12b of the transfer roller 12 in the sub-case 52 and rotates to the support member 60 via a tip portion 64a that supports the end portion 12b of the transfer roller 12 and a pair of bearings 62. It has a base end portion 64b that is supported as possible. A coil spring 68 is interposed between the spring receiver 66 fixed to the tip end portion 64a of the support shaft 64 and the end surface of the transfer roller 12 in a pressurized state.

A pair of bearings 62 are fitted in the support member 60, and a through hole 60a for accommodating the base end portion 64b of the support shaft 64 is formed in the support member 60. An annular seal ring 70 is interposed between the inner peripheral surface 60b on the side and the outer peripheral surface 64c of the support shaft 64.

The above-mentioned sealing heat insulating sheet 58 has a significantly low thermal conductivity in order to suppress heat conduction from the sub-case 52 to the support member 60, and preferably, for example, scaly graphite is formed between the graphite layers. From a highly recoverable expanded graphite sheet obtained by rolling expanded graphite expanded by rapid heat treatment of a graphite interlayer compound or graphite oxide, or a composite material of the expanded graphite and a mesh type metal sheet or resin. It is composed. Further, the annular seal ring 70 is for enhancing the airtightness of the muffle 24, and is preferably made of a heat-resistant rubber such as silicon rubber or ethylene tetrafluoride rubber.

A hole 72 for maintenance is formed in the upper wall 52a of the auxiliary case 52 that accommodates the end portion 12b of the transport roller 12 and the tip end portion 64a of the support shaft 64, and the hole 72 is sealed in the upper wall 52a. It is airtightly closed by a lid plate 76 fastened via a heat insulating sheet 74. The sealing heat insulating sheet 74 has a significantly low thermal conductivity for suppressing heat conduction, and is made of, for example, the same material as the sealing heat insulating sheet 58.

The base end portions 64b of the plurality of support shafts 64 project from the through holes 60a formed in the support member 60 in the direction away from the furnace body 14. A sprocket 78 is attached to a portion of the base end portion 64b of the support shaft 64 that protrudes from the through hole 60a. As shown in FIG. 1, a drive chain 84 is wound between the sprocket 78 and the sprocket 82 fixed to the output shaft of the drive device 80, and each support shaft 64 is rotationally driven by the drive device 80. It has become so.

As shown in FIG. 2, the muffle 24 configured as described above includes a longitudinal reinforcing rib 86 that protrudes outward and is continuous in parallel with the transport direction, and a widthwise reinforcing rib 88 that is continuous in a direction orthogonal to the longitudinal direction. And are provided to increase the rigidity of the muffle 24.

As shown in FIG. 3, a nitrogen gas supply pipe 90 penetrating the bottom wall 46a of the lower furnace body 46 is connected to the main case 50 of the muffle 24, and also to the sub case 52 communicating with the main case 50. The nitrogen gas supply pipe 92 is connected. Further, an exhaust pipe 30 penetrating the upper wall 48a of the upper furnace body 48 is connected to the main case 50. As a result, the object to be heated is heated with the nitrogen gas having a low dew point supplied from a nitrogen supply source (not shown) filled in the muffle 24.

The bottom wall 46a of the lower furnace body 46 and the upper wall 48a of the upper furnace body 48 are provided with an upper temperature sensor 96 and a lower temperature sensor 98 for detecting the temperature outside the muffle 24 in the furnace body space 42. The upper wall 48a of the upper furnace body 48 is provided with a temperature sensor 100 inside the muffle that detects the temperature inside the muffle 24.

As shown in FIG. 3, the upper heater 40 and the lower heater 41 housed in the furnace body space 42 of the furnace body 14 and located on the upper side and the lower side of the muffle 24 have terminals 102 at both ends of the furnace body 14, respectively. It is supported by the upper side wall 48b and the lower side wall 46b of the furnace body 14 in a state of protruding outward, respectively. The terminals 102 at both ends of the upper heater 40 and the terminals 102 at both ends of the lower heater 41 are covered with terminal covers 104 fixed to the upper side wall 48b and the lower side wall 46b, respectively.

Returning to FIG. 1, in the heating furnace 10 configured as described above, the shielding shutter 26 and the heat insulating shutter 56 are initially closed. In this state, the nitrogen gas having a low dew point supplied from a nitrogen supply source (not shown) is filled in the muffle 24, and the upper heater 40 and the lower heater 41 shown in FIG. 3 bring the inside of the muffle 24 to a predetermined heating temperature. Be maintained.

Next, the transport case 16 filled with the untreated object to be heated in the work chamber 22 is sent to the spare chamber 51b in the muffle 24, that is, the unheated position through the opened shielding shutter 26, and the shielding shutter 26 is closed.

After a predetermined time, the heat insulating shutter 56 is opened and the transport case 16 is sent to the heating chamber 51a in the muffle 24, that is, the heating position, and then the heat insulating shutter 56 is closed for a predetermined time under a nitrogen atmosphere having a low dew point. By heating with, the object to be heated is dehydrated. When the dehydration treatment is completed in the heating chamber 51a, the heat insulating shutter 56 is opened and the transport case 16 is moved to the spare chamber 51b.

Next, the heat insulating shutter 56 is closed, the shielding shutter 26 is opened, and the transport case 16 is sent into the work room 22. In the work room 22, the material to be dehydrated in the transport case 16 is filled in a seal bag and stored.

As described above, according to the heating furnace 10 (roller transport type heating furnace) of the present embodiment, the furnace body 14 in which the furnace body space 42 for accommodating the object to be heated is formed and the furnace body 14 are passed through the side wall 14a of the furnace body 14 to each other. Rollers that rotatably support both a plurality of transport rollers 12 arranged in parallel in the longitudinal direction of the furnace body 14 with a gap between them, and both end portions 12b of the transport rollers 12 protruding from the side wall 14a of the furnace body 14. By providing a support device 44 and rotationally driving the transfer roller 12, the object to be heated on the transfer roller 12 is moved into a heating chamber (heating position) 51a inside the furnace body 14 and a spare chamber (non-heated position) outside the furnace body 14. ) 51b is a heating furnace (roller transport type heating furnace) 10 that transports the object to be heated and heats the object to be heated, and has an opening 20 for passing the transfer case 16 filled with the object to be heated. In the internal space 42, the transport case 16 for accommodating the object to be heated and the transport roller 12 for transporting the transport case 16 are covered, and both ends 12b of the transport roller 12 protruding from the side wall 14a outside the furnace body 14 are covered, respectively. The integrally formed metal muffle 24 is provided, the furnace body 14 is divided into a lower furnace body 46 and an upper furnace body 48, and the upper furnace body 48 is a lower furnace body 46 via a part of the muffle 24. It is placed on the top. As a result, the main part of the muffle 24 having a width dimension larger than that of the furnace body 14 is easily installed in the furnace body 14. Further, since the lower side of the transport roller 12 is also covered with the muffle 24, the heat insulating material such as refractory bricks and ceramic fibers is not exposed to the heating chamber 50a in the furnace, which is required for heat treatment of the object to be heated. A heating atmosphere with a low dew point can be obtained.

Further, according to the heating furnace 10 of the present embodiment, the metal muffle 24 is the main case 50 that houses the object to be heated filled in the transport case 16 and the central portion 12a of the transport roller 12 in the furnace body 14. A pair of sub-cases 52 for accommodating both end portions 12b of the transfer roller 12 outside the furnace body 14 and a part of a plurality of transfer rollers 12 passing through the side wall 14a of the furnace body 14 are accommodated, and the main case 50 and the sub-case 50 are accommodated. A connecting case 54 for connecting the case 52 is integrally provided, and the lower furnace body 46 has a bottom wall 46a and a lower side wall 46b rising from a side end of the bottom wall 46a, and the upper furnace body 48. Has an upper wall 48a and an upper side wall 48b that descends from the side end of the upper wall 48a, and the upper side wall 48b of the upper furnace body 48 is placed on the lower side wall 46b of the lower furnace body 46 via a connecting case 54. It is placed. As a result, the main part of the muffle 24 having a width dimension larger than that of the furnace body 14 is easily installed in the furnace body 14. Further, since both ends 12b of the transport roller 12 are covered with the muffle 24, a heating atmosphere having a low dew point required for heat treatment of the object to be heated can be obtained.

Further, according to the heating furnace 10 of the present embodiment, the connecting case 54 has a lower plate 54a and an upper plate 54b arranged in parallel with each other with a space for passing the transport roller 12 passing through, and a lower plate 54a and an upper plate. It includes a plurality of support plates 54c arranged between the transport rollers 12 among the 54b and supporting the upper plate 54b. As a result, the connecting case 54 can support the load of the upper furnace body 48 while being sandwiched between the lower furnace body 46 and the upper furnace body 48, so that a support structure such as a support frame for supporting the upper furnace body 48 can be provided. The heating furnace 10 is smaller than when it is provided separately.

Further, according to the heating furnace 10 of the present embodiment, the roller support device 44 has a support member 60 fastened to the sub case 52 via a sealing heat insulating sheet 58, and an end of the transport roller 12 in the sub case 52. It has a tip portion 64a that fits into the portion 12b and supports the end portion 12b of the transport roller 12, and a base end portion 64b that is rotatably supported by the support member 60 via a bearing 62, and is concentric with the transport roller 12. Includes a plurality of support shafts 64 arranged in. As a result, the support member 60 that rotatably supports the support shaft 64 that supports the transport roller 12 via the bearing 62 is fastened to the sub-case 52 via the sealing heat insulating sheet 58, so that the support member The sealing between the 60 and the sub-case 52 is enhanced to obtain a heating atmosphere with a low dew point. Further, the temperature rise of the bearing 62 is suppressed, and the durability of the roller support device 44 is enhanced.

Further, according to the heating furnace 10 of the present embodiment, the support member 60 is formed with a through hole 60a for fitting the bearing 62 and accommodating the base end portion 64b of the support shaft 64, and the bearing in the through hole 60a. An annular seal ring 70 is interposed between the inner peripheral surface 60b on the furnace body 14 side of 62 and the outer peripheral surface 64c of the support shaft 64. Therefore, since the space inside the sub-case 52, that is, the muffle 24 is shielded from the atmosphere by the seal ring 70, a heating atmosphere having a low dew point required for heat treatment of the object to be heated can be obtained.

Further, according to the heating furnace 10 of the present embodiment, the base end portion 64b of the support shaft 64 protrudes from the through hole 60a formed in the support member 60 in the direction away from the furnace body 14, and the sprocket 78 is mounted. The support shaft 64 is rotationally driven via the sprocket 78. As a result, the support shaft 64 for supporting and driving the transport roller 12 is driven at a position away from the furnace body 14, so that the durability of the device for driving the rollers can be obtained.

Further, according to the heating furnace 10 of this embodiment, the main case 50 has a longitudinal shape in the transport direction of the object to be heated by the transfer roller 12, and the sub-case 52 and the connecting case 54 also form a longitudinal shape in the transport direction of the object to be heated. It has a long shape. As a result, the entire transport roller 12 is housed at once, which has the advantage of simplifying the structure of the muffle 24.

Although the present invention has been described in detail with reference to the drawings, the present invention is also applicable to other aspects.

For example, the heating furnace 10 of the above-described embodiment was a batch type, but may be a continuous type heating furnace. In the case of this continuous heating furnace, a shielding shutter 26 and a heat insulating shutter 56 may be provided on the other end side of the main case 50 provided in the muffle 24, which is the opposite side of the work chamber 22.

Further, in the muffle 24 of the above-described embodiment, a part of the muffle 24 in the longitudinal direction is covered by the furnace body 14, but the entire muffle 24 in the longitudinal direction may be covered by the furnace body 14.

Further, in the above-described embodiment, nitrogen gas having a low dew point is supplied into the muffle 24, but other types of gas may be supplied. In short, it suffices if heat treatment at a low dew point is possible for dehydration and the like.

Further, in the muffle 24 of the above-described embodiment, the sub-case 52 and the connecting case 54 are integrally formed in the longitudinal direction of the main case 50, but they may be divided in the longitudinal direction thereof.

It should be noted that the above description is merely an embodiment of the present invention, and the present invention can be modified in various ways without departing from the spirit of the present invention.

10: Heating furnace (roller transfer type heating furnace)
12: Conveying roller 12a: Central part 12b: End part 14: Furnace 14a: Side wall 16 of the furnace body: Conveying case 20: Opening 24: Muffle 26: Shielding shutter 42: Inside space 44: Roller support device 46: Lower furnace Body 46a: Bottom wall 46b: Lower side wall 48: Upper furnace body 48a: Upper wall 48b: Upper side wall 50: Main case 51a: Heating chamber (heating position)
51b: Spare room (non-heated position)
52: Sub-case 54: Connecting case 54a: Lower plate 54b: Upper plate 54c: Support plate 58: Sealing heat insulating sheet 60: Support member 60a: Through hole 62: Bearing 64: Support shaft 64a: Tip portion 64b: Base end portion 70: Seal ring 78: Sprocket

That is, the gist of the present invention is (a) a gap between the furnace body in which the space inside the furnace body for accommodating the object to be heated is formed and the furnace body in the longitudinal direction in a state parallel to each other through the side wall of the furnace body. A plurality of transfer rollers arranged so as to be separated from each other and a roller support device for rotatably supporting both ends of the transfer roller protruding from the side wall of the furnace body are provided, and the transfer rollers are rotationally driven. A roller transport type heating furnace in which the object to be heated on the transfer roller is transported between a heating position inside the furnace and a non-heating position outside the furnace body to heat the object to be heated. b) It has an opening through which the object to be heated is passed, covers a transfer case for accommodating the object to be heated and the transfer roller for transporting the transfer case in the space inside the furnace, and the furnace outside the furnace body. It is provided with a metal muffle integrally formed so as to cover both ends of the transport roller protruding from the side wall of the body. (C) The furnace body is divided into a lower furnace body and an upper furnace body, and (d). ) The upper furnace body is placed on the lower furnace body via the muffle, and (e) in the muffle, the heated in an atmosphere of an inert gas having a dew point of −30 ° C. or lower. The object is heat-treated, and (f) the muffle accommodates the main case for accommodating the object to be heated and the central portion of the transfer roller inside the furnace body, and both ends of the transfer roller outside the furnace body. A pair of sub-cases and a connecting case for accommodating a part of the plurality of transport rollers passing through the side wall of the furnace body and connecting the main case and the sub-case are integrally provided (g). The roller support device supports the support member fastened to the sub-case via a sealing heat insulating sheet, and the end of the transport roller that is fitted to the end of the transport roller in the sub-case. and a rotatably supported base end to the support member through the distal end portion and the bearing, a plurality of support shafts disposed on the conveying roller concentrically, in free Mukoto.

According to the roller transport type heating furnace of the present invention, the transport case having an opening through which the object to be heated is passed and accommodating the object to be heated in the space inside the furnace and the transfer roller for transporting the transfer case. The furnace body is provided with a metal muffle integrally formed so as to cover both ends of the transport roller protruding from the side wall of the furnace body outside the furnace body, and the furnace body is a lower furnace body and an upper furnace body. It is divided into bodies, and the upper furnace body is placed on the lower furnace body via the muffle. As a result, a muffle having a width larger than that of the furnace body can be easily installed in the furnace body. Further, both ends of the transport roller are covered with a muffle, and in the muffle, the heat-treated object is heat-treated in an atmosphere of an inert gas having a dew point of −30 ° C. or lower. A heating atmosphere with a low dew point required for heat treatment can be obtained. Further, since the support member that rotatably supports the support shaft that supports the transport roller via the bearing is fastened to the sub-case via the sealing heat insulating sheet, it is between the support member and the sub-case. The sealing of the bearing is enhanced to obtain a heating atmosphere with a low dew point, and the temperature rise of the bearing is suppressed to enhance the durability.

Here, preferably, before Symbol lower furnace body are those having a lower side wall rising from the side edge of the bottom wall and the bottom wall, the upper furnace body falls from the side end of the upper wall and the top wall It has an upper side wall, and the upper side wall of the upper furnace body is placed on the lower side wall of the lower furnace body via the connecting case. As a result, the furnace is provided with a muffle that integrally includes a pair of sub-cases that house both ends of the transport roller outside the main case and the furnace body, and a connecting case that houses a part of the transport roller that passes through the side wall of the furnace body. It can be easily installed in the body. Further, since both ends of the transport roller are covered with muffles, a heating atmosphere having a low dew point required for heat treatment of the object to be heated can be obtained.

Claims (7)

A furnace body in which a space inside the furnace body for accommodating an object to be heated is formed, and a plurality of transfer rollers arranged in a state parallel to each other through the side wall of the furnace body with a gap in the longitudinal direction of the furnace body. A roller support device for rotatably supporting both ends of the transfer roller protruding from the side wall of the furnace body is provided, and the transfer roller is rotationally driven to move the object to be heated on the transfer roller into the furnace body. It is a roller transport type heating furnace that transports between the heating position of the above and the non-heating position outside the furnace body to heat the object to be heated.
It has an opening through which the object to be heated passes, covers the transport case for accommodating the object to be heated and the transport roller for transporting the transport case in the space inside the furnace, and the furnace body outside the furnace body. A metal muffle integrally formed to cover both ends of the transport roller protruding from the side wall.
The furnace body is divided into a lower furnace body and an upper furnace body.
The upper furnace body is a roller transport type heating furnace characterized in that it is placed on the lower furnace body via the muffle. The muffle includes a main case for accommodating the object to be heated and the central portion of the transfer roller inside the furnace body, a pair of sub-cases for accommodating both ends of the transfer roller outside the furnace body, and the furnace body. A connecting case for accommodating a part of the plurality of transport rollers passing through the side wall and connecting the main case and the sub case is integrally provided.
The lower furnace body has a bottom wall and a lower side wall rising from a side end of the bottom wall, and the upper furnace body has an upper wall and an upper side wall rising from a side end of the upper wall. The roller transport type heating furnace according to claim 1, wherein the upper side wall of the upper furnace body is placed on the lower side wall of the lower furnace body via the connecting case. The connecting case is arranged between the lower plate and the upper plate arranged in parallel with each other with a space for passing the transfer roller, and the upper plate between the lower plate and the upper plate. The roller transport type heating furnace according to claim 2, further comprising a plurality of supporting plates to support. The roller support device supports the support member fastened to the sub-case via a sealing heat insulating sheet, and the end of the transport roller that is fitted to the end of the transport roller in the sub-case. 2. Or 3 roller transfer type heating furnace. The support member is formed with a through hole for fitting the bearing and accommodating the base end portion of the support shaft.
The roller according to claim 4, wherein an annular seal ring is interposed between the inner peripheral surface of the through hole on the furnace body side of the bearing and the outer peripheral surface of the support shaft. Transport type heating furnace. The base end portion of the support shaft protrudes from the through hole formed in the support member in a direction away from the furnace body, and a sprocket is attached, and the support shaft is rotationally driven via the sprocket. The roller transfer type heating furnace according to claim 5. The main case is characterized in that the transport roller forms a longitudinal shape in the transport direction of the object to be heated, and the sub case and the connecting case also form a longitudinal shape in the transport direction of the object to be heated. The roller transport type heating furnace according to any one of claims 2 to 6.

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