JP4587022B2 - Continuous firing furnace and continuous firing method - Google Patents

Description

  The present invention relates to a continuous baking furnace and a continuous baking method for continuously baking a plurality of articles to be processed.

  FIG. 9 shows a configuration of a conventional continuous firing furnace disclosed in Patent Document 1 below. This continuous baking furnace includes an insertion deaeration chamber 53 through which a tray 52 on which an object 51 is placed can pass, and a plurality of trays arranged in a row and arranged in a chamber 54 connected to the charging / deaeration chamber 53. 52 includes a firing furnace main body 55 sequentially fed from the charging / deaeration chamber 53 and an extraction deaeration chamber 56 that is connected to the chamber 54 and through which the tray 52 that has passed through the firing furnace main body 55 can pass.

  The inlet-side deaeration chamber 53 and the outlet-side deaeration chamber 56 have door bodies 57, 58, 59, 60 that can be raised and lowered at upstream and downstream locations in the tray 52 conveyance direction, respectively. When the door bodies 57, 58, 59, 60 are set at the lowered position, the air-tightness of the inlet side deaeration chamber 53, the chamber 54, and the outlet side deaeration chamber 56 is maintained, and the door bodies 57, 58, 59, When 60 is set to the raised position, the tray 52 is allowed to pass. In addition, a pair of left and right skid beams 61, 62, and 63 are slidable from below on the inlet side deaeration chamber 53, the firing furnace body 55, and the outlet side deaeration chamber 56 over substantially the entire length thereof. It is provided to support. A plurality of heaters 64 extending vertically are disposed on the left and right sides of the firing object aggregate 51 on the tray 52 inside the intermediate portion in the longitudinal direction of the firing furnace main body 55. The article to be processed 51 is heated. Further, the continuous firing furnace includes a pusher 65 that pushes the tray 52 from the charging deaeration chamber 53 into the firing furnace body 55 one by one, and a puller that pulls out the tray 52 from the firing furnace body 55 to the extraction deaeration chamber 56 one by one. 66 is attached.

  When the continuous firing furnace is operated, a non-oxidizing gas is filled into the firing furnace main body 55 with the doors 58 and 59 closed, and the heater 64 is operated to set the interior of the firing furnace main body 55 in advance. Heat to a certain temperature. Next, the tray 52 on which the product to be processed 51 is placed is carried into the entry-side deaeration chamber 53, the door body 57 is closed, and the air in the entry-side deaeration chamber 53 is discharged to the outside. , The tray 52 is pushed into the firing furnace main body 55 by the pusher 65, and the door body 58 is closed again. After a predetermined time has passed, another tray 52 is pushed into the firing furnace main body 55 from the entry side deaeration chamber 53 by the procedure as described above, and has already been pushed into the entry side deaeration chamber 53 by the tray 52. The tray 52 is pushed toward the outlet side deaeration chamber 56.

  By repeating such an operation, when the tray 52 has advanced to the most downstream side in the conveying direction of the baking furnace body 55, the door body 59 is opened with the door body 60 closed, and the tray 52 is removed from the baking furnace by the puller 66. The main body 55 is drawn into the outlet side deaeration chamber 56, the door body 59 is closed, the door body 60 is opened, and the tray 52 is taken out. As a result, the product 51 is gradually heated over a predetermined time in the preheating chamber 67 near the entry-side degassing chamber 53 in the baking furnace body 55, and the intermediate portion in the baking furnace body 55 is heated. It is heated to a constant temperature in the chamber 68 for a predetermined time, and further cooled gradually in the cooling chamber 69 near the outlet side deaeration chamber 56 in the firing furnace body 55 over a predetermined time.

JP 2002-130956 A

  By the way, when the material, shape, and size of the article to be processed are different, the heat treatment curve that is optimal for the firing is also different. For example, some products require rapid heating in a certain heating area. For this reason, in order to bake various to-be-processed goods with one continuous baking furnace, it is requested | required that the heat processing curve suitable for baking of each to-be-processed goods should be implement | achieved. However, since the above-mentioned conventional continuous firing furnace heats and heats the product to be processed by a radiant heating type heater, the product to be processed cannot have a rapid temperature change higher than the thermal conductivity. In the case of a continuous furnace, it is difficult to arbitrarily change the heat treatment curve once set in a short time.

  The present invention has been developed to solve the above-described problems. That is, an object of the present invention is to provide a continuous firing furnace capable of producing a wide variety of fired products by changing the heating rate of the product to be treated freely in an arbitrary heating zone and realizing various heat treatment curves. It is to provide a continuous firing method.

In order to achieve the above object, the continuous firing furnace of the present invention continuously feeds a plurality of products to be processed by intermittently feeding a plurality of trays on which the products to be processed are placed into a processing chamber for firing the products to be processed. A continuous firing furnace for firing automatically, a heating chamber provided in the processing chamber and formed such that a plurality of trays on which articles to be processed are placed can pass from the upstream side toward the downstream side. , provided in the heating chamber, a heater for heating the workpieces, and a plurality of electrical heating device for electrically heating a specific workpieces in the heating chamber, the heating chamber are each in the furnace length direction A plurality of heating and heating devices provided at different positions, and the plurality of energization heating devices are respectively provided in the plurality of heating zones, and a specific article to be treated is disposed upstream of the heating zone on the upstream side. After energization heating by the energization heating device, downstream The transported to the heating zone, so that the current can be supplied heated by the electrical heating device on the downstream side in the heating zone of the downstream side, it is characterized by the.

Further, in the continuous firing furnace of the present invention, preferably, the electrical heating device is provided with upper and lower electrodes sandwiching the workpieces from above and below, the electrical heating power supply for energizing between the electrodes.

In the continuous firing furnace of the present invention, preferably, the lower electrode is configured to be driven up and down, and the tray includes a tray body having a through hole through which the lower electrode can pass in a non-contact manner, and the through hole. And a conductive mounting portion that is supported by being fitted from above and on which the product to be processed is mounted, and the energization heating device is configured such that when the product to be processed is located above the lower electrode, the lower electrode Is lifted up to push up the article to be treated together with the placement part, and is sandwiched between the upper electrode and the tray body and the placing part are electrically insulated, and then the article to be treated is heated by energization. To do .

In the continuous firing furnace of the present invention, preferably, the tray is configured so that a plurality of articles to be processed can be placed in the width direction, and the electric heating device corresponds to the number of articles to be processed arranged in the width direction. A plurality of them are arranged in the width direction.

The continuous firing method of the present invention is a continuous firing method in which a plurality of trays on which a product to be processed is placed are sequentially and intermittently fed into a processing chamber for firing the product to be processed, and the plurality of products to be processed are continuously fired. In the firing method, a heating chamber formed so that a plurality of trays on which an article to be processed is placed can pass through the interior from the upstream side toward the downstream side is provided in the processing chamber, A plurality of heating zones that have a plurality of heating zones provided at positions different from each other in the furnace length direction, are provided with a heater that heats the product to be processed in the heating chamber, and that heats a specific product to be processed in the heating chamber An apparatus is provided in each of the plurality of heating zones, and a specific article to be processed is heated by the upstream heating zone in the upstream heating zone, and then conveyed to the downstream heating zone. In front of the downstream side in the heating section on the downstream side Being adapted to be energized heating by resistance heating apparatus, the workpieces, as well as heated by the heater, by the electrical heating device, for electrically heating a particular workpieces, it is characterized.

Further, in the continuous firing method of the present invention, preferably, the workpieces, and clamped between the upper and lower arranged upper and lower electrodes, energizing heating the treated product by energizing between the electrodes .

In the continuous firing method of the present invention, preferably, the lower electrode is configured to be driven up and down, and the tray has a tray body having a through-hole through which the lower electrode can pass in a non-contact manner, and the through-hole. It is composed of a conductive mounting portion that is fitted and supported from above and places the product to be processed. When the product to be processed is located above the lower electrode, the lower electrode is raised. pushing up a workpiece with the mounting section Te, which the mounting part and the tray main body on which the electrically insulated state while sandwiched between the upper electrode and electrically heating the workpieces.

In the continuous firing method of the present invention, preferably, the tray is configured so that a plurality of articles to be processed can be placed in the width direction, and the energization heating is performed among the plurality of articles to be processed arranged in the width direction. Do this for all or part of it .

In the continuous firing method of the present invention, preferably, the article to be processed is accommodated in a case made of a conductive heating element, which is sandwiched between the upper and lower electrodes and heated by conduction.

  According to the continuous firing furnace and the continuous firing method of the present invention, in addition to radiant overheating by a heater, a specific target product to be rapidly heated is energized and heated, whereby a specific target product can be rapidly heated in an arbitrary heating zone. Can be heated. In addition, by arranging a plurality of current heating devices in the furnace length direction, it is possible to conduct current heating in a plurality of heating zones in the heating chamber, thereby realizing various heat treatment curves and producing various types of fired products. Can be produced.

  Further, the product to be processed can be energized and heated by sandwiching the product to be processed between the upper and lower electrodes and energizing the electrodes. In addition, the lower electrode can be driven up and down, and by raising the lower electrode, the product to be processed sandwiched between the upper and lower electrodes can be energized and heated. It is possible to electrically insulate from other parts of the current to prevent loss of energization current.

  Further, the tray is configured so that a plurality of products to be processed can be placed in the width direction, and a plurality of current heating devices corresponding to the plurality of products to be processed arranged in the width direction are provided in the width direction. By conducting current heating on all or a part of them, current heating can be performed simultaneously on a plurality of products to be processed arranged in the width direction. Thereby, the productivity of the product can be greatly improved. In addition, even if a plurality of products to be processed arranged in the width direction include those that require current heating, those that do not require current heating, and those that do not have conductivity, appropriate processing corresponding to these It can be performed.

  For non-conductive products, the case itself is heated by encasing the product in a case made of a conductive heating element and holding it between the upper and lower electrodes. By doing so, the article to be processed can be rapidly heated.

  As described above, according to the continuous firing furnace and the continuous firing method of the present invention, a variety of fired products can be obtained by freely changing the heating rate of the product to be treated in any heating zone and realizing various heat treatment curves. The excellent effect that can be produced is obtained.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the accompanying drawings. In each figure, the same portions are denoted by the same reference numerals, and redundant description is omitted.

  FIGS. 1-6 shows 1st Embodiment of the continuous baking furnace and continuous baking method of this invention. As shown in FIG. 1, this continuous baking furnace includes a charging / degassing chamber 12 through which a tray 2 on which an article 1 to be processed is placed can pass, and a processing chamber 15 connected to the charging / degassing chamber 12. The chamber 14 to be formed, the heat insulating wall 18 installed in the processing chamber 15, the heater installed in the heating chamber 20 surrounded by the heat insulating wall 18, and the article 1 to be processed in the heating chamber 20 A plurality of electric heating devices 24 (24A, 24B, 24C) for electric heating, an extraction deaeration chamber 16 that is connected to the outlet side of the processing chamber 15 and through which the tray 2 that has passed through the processing chamber 15 can pass, and processing A plurality of free rollers 32 supported so as to be in contact with the lower surface of the tray 2 over almost the entire length in the chamber 15 are provided.

  The article to be processed 1 is a conductive heating element such as graphite, ceramics, or metal, and is made of a material that generates heat with an internal resistance when energized.

  The charging deaeration chamber 12 and the extraction deaeration chamber 16 have open / close doors 13a, 13b, 17a, and 17b that can be raised and lowered on the upstream side and the downstream side in the tray 2 conveyance direction, respectively. When these open / close doors 13a, 13b, 17a, 17b are in the lowered position, the charging / deaeration chamber 12, the processing chamber 15, and the extraction deaeration chamber 16 are kept airtight. 2 can pass through. In this example, the open / close doors 13a, 13b, 17a, and 17b include a door, a cylinder that raises and lowers the door, and a lock mechanism (not shown), but other well-known structures may be employed instead. . Further, the inside of the insertion degassing chamber 12 and the extraction degassing chamber 16 can be replaced with the same atmosphere as the processing chamber 15.

  The processing chamber 15 communicates with each of the charging / deaeration chamber 12 and the extraction deaeration chamber 16, and there is no opening communicating with the outside except for the open / close doors 13 b and 17 a, so that the internal sealed state can be maintained. It is configured.

  The heat insulating wall 18 is composed of an inlet side portion 18a and an outlet side portion 18c having a small thickness and a low internal height, and a central portion 18b having a large thickness and a high internal height. Is provided with a plurality of heaters 19 extending in the vertical direction that can heat the workpiece 1 over almost the entire region in the furnace length direction, whereby a heating chamber 20 is formed inside the central portion 18 b of the heat insulating wall 18. The workpiece 1 is heated. The inside of the thin inlet side portion 18 a functions as the preheating chamber 21, and the outlet side portion 18 c and the processing chamber 15 downstream thereof function as the cooling chamber 22. As the material of the heat insulating wall 18, graphite having excellent heat resistance is used.

  Further, the continuous firing furnace further treats the inside of the charging deaeration chamber 12 and the extraction deaeration chamber 16 while selectively keeping the inside of the processing chamber 15 in nitrogen gas, argon gas, halogen gas or vacuum. An atmosphere holding / replacement device (not shown) that replaces the same atmosphere as the chamber 15 as needed is provided.

  The pusher device 36 and the puller device 37 have an engaging member that engages only with a part of the horizontally moving member when going downstream, and the tray 2 is pushed in from the upstream side to arrange a plurality of trays 2. It can be conveyed intermittently in a state, or a single tray 2 can be pulled in from the downstream side and a predetermined stroke can be conveyed intermittently. The pusher device 36 and the puller device 37 may have the same configuration as the pusher or puller disclosed in the above-mentioned Patent Document 1, or may be another known one-way intermittent conveyance mechanism.

2 is a cross-sectional view taken along line XX in FIG. As shown in the drawing, the energization heating device 24 includes upper and lower electrodes 25 and 26 that sandwich the workpiece 1 from above and below, and an energization heating power source that energizes the electrodes 25 and 26 via a cable 29. 30. The upper and lower electrodes 25, 26 pass through the top and bottom of the chamber 14 and the heat insulating wall 18, and their tips protrude into the heating chamber 20. As the material for the electrodes 25 and 26, graphite having excellent conductivity and heat resistance is used.

  The upper electrode 25 and the lower electrode 26 penetrate the chamber 14 and the heat insulating wall 18 with a predetermined gap therebetween. A flange portion is provided at the upper end portion of the upper electrode 25, and an insulating seal member 27 a having electrical insulation and sealing properties is interposed between the flange portion and the upper end portion of the chamber 14. Similarly, an insulating seal member 27 b is interposed between the lower electrode 26 and the chamber 14. As a result, the upper and lower electrodes 25, 26 are electrically insulated from the chamber 14 and the heat insulating wall 18, and outside air from between them is sealed.

  The lower electrode 26 is driven up and down by an electrode lifting device 39 provided below the chamber 14. The electrode lifting / lowering device 39 is a linear motion cylinder in this example, but other known linear motion devices can also be used. An insulating member 27 c is interposed between the lower electrode 26 and the electrode lifting device 39.

  A number of free rollers 32 are pivotally supported by a bracket 32 b provided at the upper end of a support column 32 a erected on the inner bottom surface of the heat insulation wall 18, and a large number of free rollers 32 are arranged over the entire length in the processing chamber 15. Two rows of the free rollers 32 are arranged side by side in the width direction of the tray 2 so that the free rollers 32 are in contact with both ends of the lower surface of the tray 2 in the width direction. Further, in the charging and deaeration chamber 12 and the extraction deaeration chamber 16, free rollers 33 and 34 are disposed so as to contact the lower surface of the tray 2 with the same column structure as the above-described free roller 32.

  FIG. 3 shows the configuration of the tray 2 used in the present invention. As shown in the figure, the tray 2 is composed of a rectangular flat plate-like tray main body 2a and a disc-shaped conductive mounting portion 2b. The tray body 2a has a through-hole 3 having a size that allows the lower electrode to pass through without contact. The placing portion 2b is supported by being fitted into the through hole of the tray main body 2a from above, and the workpiece 1 is placed thereon. The mounting portion 2b is preferably made of a heat resistant material such as graphite. Further, the outer peripheral surface that fits with the tray main body 2a of the mounting portion 2b is formed in a taper shape, and the inner peripheral surface that fits with the mounting portion 2b of the tray main body 2a is formed in a tapered shape. Thus, the fitting property between the tray main body 2a and the placing portion 2b is improved.

  FIG. 4 is a diagram for explaining a state in which the workpiece 1 is heated and energized by the energization heating device 24. (A) shows the time of carrying the tray 2, and (b) shows the time of current heating. When the workpiece 1 is positioned above the lower electrode 26 as shown in FIG. 4A, the electric heating device 24 raises the lower electrode 26 and pushes up the workpiece 1 together with the mounting portion 2b. As shown in FIG. 4B, this is sandwiched between the upper electrode 25 and the tray body 2a and the placing portion 2b are electrically insulated. In this state, the current to be processed 1 is heated by energization between the upper and lower electrodes 25 and 26 by the energization heating power source 30.

  In some cases, the article to be processed 1 is not conductive. In such a case, as shown in FIG. 5, the product 1 is housed in a case 40 made of a conductive heating element, which is sandwiched between the upper and lower electrodes 25 and 26 and energized. When the 40 itself generates heat, the article to be processed 1 can be heated. As a material of the case 40, graphite, SiC, or the like is used.

  Next, a continuous firing method using this continuous firing furnace will be described with reference to FIG. When the continuous baking furnace is operated, the processing chamber 15 is filled with an inert gas with the open / close doors 13a, 13b, 17a, and 17b closed, and the heater is operated to set the temperature in the heating chamber 20 in advance. Until heated.

  Next, the tray 2 on which the article to be processed 1 is placed is carried into the charging / degassing chamber 12, the open / close door 13a is closed, the air in the charging / degassing chamber 12 is discharged to the outside, and the inert gas is discharged. The atmosphere is the same as that of the processing chamber 15 by filling. Subsequently, the opening / closing door 13b is opened, the tray 2 is pushed into the preheating chamber 21 by the pusher device 36, and the opening / closing door 13b is closed. Thereby, the article to be processed 1 placed on the tray 2 pushed into the preheating chamber 21 is gradually heated over a predetermined time.

  After a predetermined tact time has elapsed, another tray 2 is pushed from the charging / degassing chamber 12 into the preheating chamber 21 by the procedure described above, and the tray 2 already pushed into the preheating chamber 21 by this tray 2 is inserted. Extrusion toward the heating chamber 20 Thereby, the article 1 to be processed placed on the tray 2 pushed into the heating chamber 20 is heated for a predetermined time. Such an operation is repeated intermittently. In this embodiment, the tact time is 10 minutes.

  Here, FIG. 6 shows a heat treatment curve required for the product to be processed, with the horizontal axis representing time [min] and the vertical axis representing temperature [° C.]. In the figure, L1 indicates a normal heat treatment curve using only a heater, and L2 and L3 indicate heat treatment curves required for a specific product to be processed.

  Now, in the process in which the tray 2 on which the article 1 to be processed is placed intermittently is conveyed, the specific article 1 to which the heat treatment curve such as L2 in FIG. If it comes between the lower electrodes, the workpiece 1 is sandwiched between the upper and lower electrodes 25 and 26 by the operation described in FIG. Thereby, it is possible to rapidly heat the specific article 1 to be processed at the position of the electric heating device 24B (time B in the figure), and it is possible to realize a heat treatment curve like L2 in FIG. In this example, the product 1 is heated to 2500 ° C. by energization heating.

  Further, by further using the current heating devices 24A and 24C arranged in other heating zones to heat the specific workpiece 1 requiring a heat treatment curve such as L3, the current flow shown in FIG. It is also possible to perform rapid heating in the time of A, B, and C to realize a heat treatment curve like L3.

  In this way, when rapid heating is required in a single or a plurality of heating zones for a specific article 1 to be processed, the energization heating device 24 is installed in the heating zone in which such rapid heating is necessary, and thereby energization heating is performed. As a result, it is possible to rapidly heat a specific article 1 to be processed in an arbitrary heating zone and realize various heat treatment curves.

  When the article 1 to be processed is not conductive, as shown in FIG. 5, the article 1 is accommodated in a case 40 made of a conductive heating element, and the upper and lower electrodes 25, Since the case 40 itself generates heat by being held between 26 and energized, the workpiece 1 can be heated.

  As time passes, the tray 2 on which the product 1 is placed is pushed out of the heating chamber 20 and pushed into the cooling chamber 22. Thereby, the article 1 to be processed is gradually cooled in the cooling chamber 22 over a predetermined time. Then, after further proceeding in the cooling chamber 22 and proceeding to the most downstream side in the processing chamber 15, the opening / closing door 17 a is opened with the opening / closing door 17 b closed, and the tray 2 is cooled by the puller device 37. After drawing into the extraction deaeration chamber 16 from 22 and closing the open / close door 17a, the open / close door 17b is opened and the tray 2 is taken out.

  As described above, in the first embodiment of the present invention, in addition to the radiant heating by the heater 19, the specific object to be processed 1 to be rapidly heated is energized and heated to arbitrarily heat the specific object to be processed 1. Can be heated rapidly in the area. As a result, various heat treatment curves can be realized, and various types of fired products can be produced.

  Further, the article to be processed 1 can be energized and heated by sandwiching the article 1 to be processed between the upper and lower electrodes 25 and 26 and energizing the electrodes 25 and 26. Further, the lower electrode 26 can be driven up and down, and by raising the lower electrode 26, the workpiece 1 sandwiched between the upper and lower electrodes 25 and 26 can be energized and heated, and at the same time the workpiece to be processed. By electrically insulating 1 from the tray body 2a and other parts in the furnace, it is possible to prevent loss of energization current.

  Further, for the non-conductive object 1 to be processed, the object to be processed 1 is accommodated in a case made of a conductive heating element, which is sandwiched between the upper and lower electrodes 25 and 26 and energized. Thus, when the case 40 itself generates heat, the workpiece 1 is rapidly heated.

  Therefore, according to the continuous baking furnace and the continuous baking method according to the first embodiment of the present invention, by freely changing the heating rate of the article 1 to be processed in an arbitrary heating zone, and realizing various heat treatment curves, An excellent effect that a variety of baked products can be produced is obtained.

  Next, a continuous baking furnace and a continuous baking method according to the second embodiment of the present invention will be described. 7 and 8 show a second embodiment of the continuous firing furnace and continuous firing method of the present invention.

  In this embodiment, two processed products 1 are placed side by side on the tray 2, and two processed products 1 are juxtaposed in the width direction with respect to the transport direction in the processing chamber 15. The product 1 is fired in the same manner as in the first embodiment described above.

  FIG. 7 is a cross-sectional view of a continuous firing furnace according to the second embodiment of the present invention, and corresponds to FIG. 2 which is a cross-sectional view taken along line XX of FIG. As shown in the figure, the continuous firing furnace includes two independent energization heating devices 24 and an electrode lifting device 39 in the width direction. In addition, three rows of free rollers 32 are provided in the width direction, and the free rollers 32 are supported in contact with each of both end portions in the width direction of the lower surface of the tray 2 and in the center portion in the width direction.

  FIG. 8 shows the configuration of the tray 2 used in the second embodiment of the present invention. As shown in the figure, the tray 2 includes a tray body 2a having a rectangular flat plate shape and two placement portions 2b. The tray body 2a has two through holes 3 large enough to allow the lower electrode of the energization heating device 24 to pass through in a non-contact manner, and the placement portion 2b is fitted in each of the two through holes 3. Has come to be supported. Other configurations of the continuous firing furnace according to the present embodiment are substantially the same as those of the first embodiment.

  Next, a continuous firing method using this continuous firing furnace will be described. The heating in the heating chamber 20, the carrying-in of the workpiece 1 into the charging / deaeration chamber 12, the transport to the preheating chamber 21, the heating chamber 20, the cooling chamber 22, and the loading into the extraction deaeration chamber 16 have been described above. Since it is the same as that of 1st Embodiment, description is abbreviate | omitted.

  In the process in which the tray 2 on which the article to be processed 1 is placed is intermittently conveyed in the heating chamber 20, for example, a specific article to be processed 1 requiring a heat treatment curve such as L2 in FIG. If it comes between the upper and lower electrodes of the energization heating device 22b, the two workpieces 1 arranged in the width direction are sandwiched between the upper and lower electrodes by the operation as described in FIG. Thereby, the specific article 1 to be processed can be rapidly heated at the position of the energization heating device 24B (see FIG. 1), and a heat treatment curve like L2 in FIG. 6 can be realized. Moreover, the heat treatment curve like L3 of FIG. 6 is also realizable by using together the electrical heating apparatus arrange | positioned in the other position of the conveyance direction.

  Moreover, even if one of the two workpieces 1 arranged in the width direction requires rapid heating by the combined use of energization heating, the other does not require energization heating. Since the devices 39 are independent of each other, it is possible to perform a process in which the one article to be processed 1 is energized and heated, but the other article 1 is not energized and heated.

  Further, when one of the articles 1 to be processed is not conductive, the one article to be processed 1 having no conductivity is accommodated in the case described with reference to FIG. The case containing the article 1 to be processed is sandwiched between the upper and lower electrodes, and this is energized and heated. In the other energization heating apparatus, the article 1 to be treated is directly sandwiched between the upper and lower electrodes, and this is energized and heated. It is also possible to perform a process such as. FIG. 7 shows the state of energization heating in such a case.

  In the present embodiment, two articles 1 to be processed are placed side by side in the width direction on the tray 2, but more pieces to be processed 1 may be placed as necessary. good. In this case, a tray structure corresponding to the number of articles to be processed 1 is adopted, and the energization heating device 24 and the electrode lifting / lowering device 39 are also provided correspondingly.

  As described above, according to the second embodiment of the present invention, in addition to the effects of the first embodiment, it is possible to simultaneously perform current heating on a plurality of objects to be processed 1 arranged in the width direction. The product productivity is greatly improved. Further, even when a plurality of articles 1 to be processed arranged in the width direction are required to be electrically heated, those that do not require current heating, and those that do not have conductivity are mixed, Since the electrode lifting / lowering device is independent, an effect that appropriate processing corresponding to these can be performed is obtained.

  In addition, this invention is not limited to embodiment mentioned above, Of course, a various change can be added in the range which does not deviate from the summary of this invention.

It is a whole block diagram of the continuous baking furnace of this invention. It is sectional drawing in the XX line of FIG. It is a figure which shows the structure of the tray which concerns on the 1st Embodiment of this invention. It is a figure which shows a mode that a to-be-processed item is electrically heated by the electrical heating apparatus in this invention. It is a figure which shows a mode that the to-be-processed goods are accommodated in a case by the electricity heating apparatus in this invention, and are heated by electricity. It is a figure which shows the heat processing curve of to-be-processed goods. It is sectional drawing which shows the 2nd Embodiment of this invention. It is a figure which shows the structure of the tray which concerns on the 2nd Embodiment of this invention. It is a whole block diagram of the conventional continuous baking furnace.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 To-be-processed object 2 Tray 2a Tray main body 2b Placement part 3 Through-hole 12 Loading deaeration chamber 13a, 13b Opening / closing door 14 Chamber 15 Processing chamber 16 Extraction deaeration chamber 17a, 17b Opening / closing door 18 Heat insulation wall 19 Heater 20 Heating chamber 21 Preheating chamber 22 Cooling chambers 24, 24a, 24b, 24c Electric heating device 25 Upper electrode 26 Lower electrodes 27a, 27b Insulating seal members 28a, 28b Terminal 28c Insulating member 29 Cable 30 Electric power source 32, 33, 34 Free roller 32a Post 32b Bracket 36 Pusher device 37 Puller device 39 Electrode lifting device 40 Case

Claims (10)

A continuous firing furnace that sequentially and intermittently feeds a plurality of trays on which a product to be processed is placed into a processing chamber that performs baking of the product to be processed,
A heating chamber provided in the processing chamber and formed such that a plurality of trays on which the workpieces are placed can pass from the upstream side toward the downstream side;
A heater provided in the heating chamber for heating the article to be processed;
A plurality of energization heating devices for energizing and heating a specific article to be treated in the heating chamber,
The heating chamber has a plurality of heating zones provided at different positions in the furnace length direction,
The plurality of current heating devices are respectively provided in the plurality of heating zones,
A specific article to be treated is heated and heated by the upstream heating device in the upstream heating zone, and then transported to the downstream heating zone, and downstream in the downstream heating zone. A continuous firing furnace characterized in that it can be electrically heated by an electrical heating device.   2. The continuous firing furnace according to claim 1, wherein the heater is provided over the entire area of the heating section on the downstream side from the heating section on the upstream side.   The continuous firing according to claim 1 or 2, wherein the energization heating device includes upper and lower electrodes for sandwiching the article to be processed from above and below, and a power supply for energization heating that energizes between the electrodes. Furnace. The lower electrode is configured to be driven up and down,
The tray includes a tray main body having a through-hole through which the lower electrode can pass in a non-contact manner, and a conductive placement portion that is supported by being fitted into the through-hole from above and on which a workpiece is placed. ,
When the article to be processed is located above the lower electrode, the energizing heating device raises the lower electrode to push up the article to be processed together with the mounting portion, and sandwiches it between the upper electrode and the tray. The continuous firing furnace according to claim 3, wherein the article to be processed is energized and heated after the main body and the mounting portion are electrically insulated. The tray is configured so that a plurality of articles to be processed can be placed in the width direction,
The continuous firing furnace according to any one of claims 1 to 4, wherein a plurality of the electric heating devices are arranged in the width direction corresponding to the number of articles to be processed arranged in the width direction. A continuous baking method in which a plurality of trays on which a product to be processed is placed in a processing chamber for baking the product to be processed is intermittently sent sequentially, and a plurality of products to be processed are continuously fired.
A heating chamber formed so that a plurality of trays on which workpieces are placed can pass from the upstream side toward the downstream side is provided in the processing chamber, and the heating chambers are different from each other in the furnace length direction. Having a plurality of heating zones provided in position,
A heater for heating the article to be processed is provided in the heating chamber,
A plurality of energization heating devices for energizing and heating a specific article to be processed in the heating chamber are provided in the plurality of heating zones, respectively, and the specific article to be processed is heated upstream in the heating zone. After energization heating by the apparatus, it is conveyed to the heating area on the downstream side, and can be energized and heated by the energization heating apparatus on the downstream side in the heating area on the downstream side,
While heating the article to be processed by the heater,
A continuous firing method characterized in that a specific article to be treated is heated by current using the current heating device. 7. The continuous article according to claim 6 , wherein the article to be treated is sandwiched between upper and lower electrodes arranged above and below, and the article to be treated is energized and heated by energizing the electrodes. Firing method. The lower electrode is configured to be driven up and down,
The tray includes a tray body having a through-hole through which the lower electrode can pass in a non-contact manner, and a conductive placement portion that is supported by being fitted into the through-hole from above and places an object to be processed. Shall consist of
When the article to be processed is located above the lower electrode, the lower electrode is raised to push up the article to be processed together with the placement section, and is sandwiched between the upper electrode and the tray body and the placement section. The continuous firing method according to claim 7 , wherein the product to be processed is heated by energization after making the material electrically insulated. The tray is configured so that a plurality of articles to be processed can be placed in the width direction,
The continuous firing method according to any one of claims 6 to 8 , wherein the electric heating is performed on all or a part of a plurality of articles to be processed arranged in the width direction. The continuous product according to any one of claims 6 to 9 , wherein the article to be processed is accommodated in a case made of a conductive heating element, and is energized and heated while being sandwiched between the upper and lower electrodes. Firing method.

Images