KR100392990B1 - Dual Kiln for Ceramic and Porcelain - Google Patents

Abstract

First to be connected and maintained at high temperature through heat induction to maximize thermal efficiency, shorten the production period, and improve productivity by performing the first roasting at a lower temperature by using the heat used for the higher temperature chaebol roasting. A kiln body divided into a firing chamber and a second firing chamber maintained at a lower temperature than the first firing chamber, a heat source installed to apply heat to the first firing chamber of the kiln body, and a kiln door opening and closing the entrance of the kiln body. Provide a double porcelain kiln.

In addition, the kiln body is coupled to the sliding movement and further comprises a bogie to form a floor on which ceramics are laminated for firing, and the heat induction path is configured to guide the heat circulated between the ceramics stacked in the first firing chamber to the second firing chamber. do.

Description

Dual Kiln for Ceramic and Porcelain}

The present invention relates to a double porcelain kiln that can be performed at the same time at the same time to perform the roasting and chaebol at the same time shorten the manufacturing time as well as maximize the thermal efficiency.

In general, ceramics are prepared by defensive (preparation of sojito), molding, drying (or post-drying), roasting (primary firing), syrup (glaze) (or siu and vegetarian), chaebol (second firing), etc. It is manufactured through.

In the defensive process, finely ground small pieces of clay such as clay or sato, the impurities are filtered out, and then precipitated in water to collect only fine sediments and dried in a shade for a certain period of time.

In addition, molding is performed using a method such as spinning, injection molding, extrusion molding, or compression molding, and forming a predetermined bowl or work shape. Drying is a process in which the molded semi-finished product is sufficiently dried in the shade. In some cases, the inscriptions on the semi-finished products are printed.

The semi-finished product sufficiently dried as described above is laminated on a kiln and baked for baking by maintaining the temperature of about 800 to 900 ° C for about 15 to 25 hours.

Then, apply glaze or glaze on the first-baked product, and apply the glaze and vegetarian food to decorate a predetermined pattern. Lay on the kiln and keep the temperature at about 1200 ~ 1300 ℃ for about 20 ~ 30 hours. Do it.

As mentioned above, the ceramics are completed through various processes, and in particular, since it takes a lot of time in roasting and chaebol, it acts as a big obstacle to mass production.

Moreover, even in the case of making a prototype, roasting and chaebol should be performed in the same way, and each time a test fails, a lot of repetitive time is required, which results in a long period of time in product development.

And since the heat used for roasting chaebol is released into the atmosphere as it is, heat loss is large and fuel consumption is high.

In some cases, in order to reduce the heat loss and increase the thermal efficiency, the kiln heat is induced into the drying chamber and used for drying.

In this case, however, a large drying room needs to be dried every day in a large factory, so a large drying room is required separately, and hot heat from the kiln cannot be directly introduced into the drying room. This limits the efficient use of heat.

An object of the present invention is to solve the above problems, it is configured to perform a low-priority roasting by using the heat used in the chaebol made of a higher temperature to maximize the thermal efficiency and shorten the production period to improve productivity It is to provide a dual porcelain kiln.

1 is a perspective view showing a first embodiment of a double ceramic kiln according to the present invention.

Figure 2 is a cross-sectional view cut in the width direction of the first embodiment of a double ceramic kiln according to the present invention.

Figure 3 is a cross-sectional view cut in the longitudinal direction of the first embodiment of the double porcelain kiln according to the present invention.

4 is a cross-sectional view corresponding to FIG. 3 showing a state in which both side wall surfaces are formed in an inclined surface in the first embodiment of the double ceramic kiln according to the present invention.

5 is a perspective view showing a second embodiment of a double ceramic kiln according to the present invention.

Figure 6 is a perspective view showing a third embodiment of the double porcelain kiln according to the present invention.

7 is a perspective view showing a fourth embodiment of a double ceramic kiln according to the present invention.

8 is a cross-sectional view cut in the longitudinal direction of the fourth embodiment of the double ceramic kiln according to the present invention.

The dual porcelain kiln proposed by the present invention is a kiln body divided into a first firing chamber communicated through a heat induction furnace and maintained at a high temperature, and a second firing chamber kept at a lower temperature than the first firing chamber, and the kiln main body. 1 includes a heat source installed to apply heat to the firing chamber, and a kiln door that opens and closes the entrance of the kiln body.

In addition, the dual porcelain kiln proposed by the present invention further includes a trolley which is slidably coupled to the kiln body and forms a bottom on which ceramics for lamination are laminated.

The heat induction path is configured to guide heat circulated between ceramics stacked in the first firing chamber to the second firing chamber.

Next, a preferred embodiment of a double ceramic kiln according to the present invention will be described in detail with reference to the drawings.

First, the first embodiment of the double ceramic kiln according to the present invention, as shown in Figures 1 to 3, the first firing chamber 11 and the first firing chamber communicated through the heat induction 14 and maintained at a high temperature A kiln body 10 divided into a second firing chamber 12 maintained at a lower temperature than 11, and a heat source 20 installed to apply heat to the first firing chamber 11 of the kiln main body 10; It includes a kiln door 30 for opening and closing the inlet of the kiln body 10.

The heat source 20 may be configured by installing one or more gas burners or oil burners at predetermined intervals, or may be configured to use a wood fire.

1 and 2 show that the heat source 20 is constituted by providing gas burners adjacent to both wall surfaces at predetermined intervals.

In the kiln body 10, the heat source 20 forms a discharge hole 24 for discharging heat into the first firing chamber 11.

The kiln body 10 is provided with a discharge opening and closing member 26 for opening and closing the discharge hole 24.

The heat induction path 14 is the first firing chamber 11 while the heat supplied to the first firing chamber 11 through the heat source 20 rises upwards and then hits the ceiling and moves downward again. It is configured to guide the heat circulated between the ceramics stacked in the second firing chamber (12).

That is, the heat induction path 14 is configured to discharge heat circulated to the bottom of the first baking chamber 11 to guide the second baking chamber 12.

Therefore, the heat induction path 14 is configured to guide heat from the bottom side of the first baking chamber 11 to the bottom side of the second baking chamber 12.

The heat flow path 14 is formed on the rear surfaces of the first firing chamber 11 and the second firing chamber 12 and is connected to the chimney 8 for discharging heat to the outside.

In addition, according to the first embodiment of the dual porcelain kiln according to the present invention, as shown in Figs. 1 to 3, the trolley which forms a floor on which the porcelain for laminating is slidably coupled to the kiln body 10 is laminated. It further includes 40.

The trolley 40 includes a first trolley 41 forming the bottom of the first firing chamber 11 and a second trolley 42 forming the bottom of the second firing chamber 12.

A plurality of wheels 43 and 46 are respectively installed on the bottom surfaces of the first bogie 41 and the second bogie 42 so as to smoothly move.

The rail 4 is installed on the ground where the wheels 43 installed on the first trolley 41 are in contact with each other.

A stopper (not shown) is installed at the end of the rail 4 to limit the separation and movement of the wheel 43.

In addition, the wheel 46 is smoothly moved on the upper surface of the partition wall 17 between the first firing chamber 11 and the second firing chamber 12 which the wheels 46 of the second bogie 42 come into contact with. It is also possible to install the auxiliary rail (47).

The auxiliary rail 47 is installed in the guide groove 48 formed as a space in which the wheel 46 of the second bogie 42 moves.

The first bogie 41 and the kiln body 10 is in contact with each other, as shown in Figs. 1 and 2, the projections 51, 54, and so as to engage with each other to prevent the shaking during the blocking and movement of heat and The groove 52 or the jaw 53 is formed.

As shown in FIGS. 2 and 3, the first trolley 41 has a heat flow path for circulating the interior of the first firing chamber 11 and guiding heat discharged to the bottom toward the second firing chamber 12 ( A heat passage 16 is formed in connection with 14.

In the first bogie 41, a plurality of outlet holes 44 are formed to discharge heat circulated in the first firing chamber 11 to the floor to guide the heat passage 16 to the bottom.

In addition, the partition wall 17 between the first firing chamber 11 and the second firing chamber 12 is connected to the heat flow passage 14 and transfers heat moving along the heat flow passage 14 to the second firing chamber. The heat inflow path 18 which leads to (12) is formed.

The heat inflow path 18 is formed by protruding the upper surface of the partition wall 17 into the second firing chamber 12, and the wheels 46 of the second bogie 42 are formed. The side of the heat inflow path 18 is formed such that the guide groove 48, which is a moving space, is formed on both side walls of the second firing chamber 42.

The ceiling of the second bogie 42 and / or the heat inlet path 18 consumes less heat from the first baking chamber 11 and has a good thermal conductivity to transfer heat into the second baking chamber 12. It is preferable to form with a metal and it uses a metal plate.

The heat opening and closing member 62 for opening and closing the communication between the heat inflow path 18 and the heat inflow path 14, as shown in FIG. 3, at a portion where the heat inflow path 14 and the heat inflow path 18 are connected to each other. Install).

The heat opening and closing member 62 is preferably installed in a rotatable manner to adjust the opening and closing amount, the opening and closing between the heat flow path 14 and the heat inflow path 18 and the heat flow path 14 and the chimney 8 It is desirable to install so that the opening and closing between) can be performed together.

That is, when the heat opening and closing member 62 is rotated to be in a horizontal state as shown in FIG. 3, the heat flow path 14 and the chimney 8 are closed, and the heat flow path 14 and the heat inflow path ( 18) is opened, and when the heat opening and closing member 62 is rotated to be in a vertical state, the heat flow path 14 and the chimney 8 are opened, and the heat flow path 14 and the heat inflow. The furnace 18 is configured to be closed.

When the heat opening and closing member 62 is between the horizontal state and the vertical state, the heat of the heat flow path 14 is divided into both the heat inflow path 18 and the chimney 8 to move.

At the end of the heat inflow path 18 (the opposite end connected to the heat inflow path 14), the inflow hole 19 for introducing guided heat into the second baking chamber 12 is formed.

An inflow hole 45 is formed in the second bogie 42 in a portion corresponding to the inflow hole 19.

On the wall surface behind the second firing chamber 12 of the kiln body 10, a discharge hole 28 for discharging heat toward the chimney 8 of the heat flow path 14 is formed.

As shown in FIG. 3, the discharge opening / closing member 64 which opens and closes communication with the heat flow path 14 is provided in the discharge hole 28 connected to the heat flow path 14.

It is preferable that the discharge opening and closing member 64 is rotatably installed to adjust the amount of opening and closing, the opening and closing between the heat flow path 14 and the discharge hole 28 and the heat flow path 14 and the chimney 8. It is desirable to install so that the opening and closing between them can also be performed.

That is, when the discharge opening and closing member 64 is rotated to be in a horizontal state as shown in FIG. 3, the heat guide 14 and the chimney 8 are closed, and the heat guide 14 and the discharge hole 28 are closed. ) Is opened, and when the discharge opening and closing member 64 is rotated in a vertical state, the heat guide 14 and the chimney 8 are opened, and the heat guide 14 and the discharge hole ( 28) is configured to close the gap.

When the discharge opening and closing member 64 is between the horizontal state and the vertical state, the heat of the heat guide 14 can be discharged to the chimney 8 and at the same time the second firing chamber 12 ) May be discharged through the discharge hole 28 and discharged to the chimney 8 along the heat induction path 14.

According to the first embodiment of the double ceramic kiln according to the present invention made as described above, the heat discharged from the heat source 20 is introduced into the first firing chamber 11 through the discharge hole 24, The heat circulated through the first firing chamber 11 is guided and moved along the heat passage 16 and the heat inflow path 14 through the outlet hole 44, and passes through the heat inflow path 18. Passed through the inflow holes (19) and (45) to the second firing chamber (12), the heat circulated through the second firing chamber (12) is discharged through the discharge hole (28) described above. It is discharged to the outside through the heat flow path 14 and the chimney (8).

And the first embodiment of the double porcelain kiln according to the present invention, as shown in Figures 1 and 3, consists of a configuration in which the kiln door 30 is integrally installed on the trolley 40.

When the kiln gate 30 is integrally formed on the trolley 40 as described above, the second trolley 42 is freely installed on the kiln gate 30.

The second trolley 42 has the other end of the fixing member 36, one end of which is fixed to the kiln door 30, in order to prevent the shaking of the free end and improve the stability at the end of the free end. It is preferable to fix and install.

The kiln door 30 is provided with sight windows 32 and 33 which can be opened and closed from time to time to observe the internal state of the first firing chamber 11 and / or the second firing chamber 12. desirable.

The see-through windows 32 and 33 are opened and closed using the window opening and closing members 34 and 35 made of the same material as the kiln door 30.

The see-through windows 32 and 33 are formed of a hole having a predetermined shape (for example, a rectangular shape) formed by penetrating a part of the kiln door 30, and the window opening and closing member 34, Reference numeral 35 is a block of a predetermined shape (for example, a brick shape having a square pillar shape) inserted into the hole.

The window opening and closing members 34 and 35 are preferably formed with handles on the outer surface to be easily gripped by hand.

As shown in FIGS. 1 and 3, a handle 49 for moving is installed on the front surface of the first bogie 41 and / or the kiln door 30.

In addition, as shown in FIGS. 1 to 3, a plurality of legs 56 are provided on the bottom surface of the kiln body 10 in order to secure a space for installing the heat source 20.

In the partition wall 17 between the first firing chamber 11 and the second firing chamber 12, as shown in FIGS. 1 and 3, the first firing chamber ( Auxiliary row holes 59 are formed so that the heat of 11 can flow directly into the second firing chamber 12 without passing through the heat guide 14 described above.

In the kiln door 30, an adjustment opening 57 is formed at a position corresponding to the auxiliary column hole 59, and the auxiliary opening and closing member 58 for opening and closing the auxiliary column hole 59 is described. Insert into the adjustment hole 57.

The auxiliary opening and closing member 58 is also preferably formed on the outer surface to be easy to hold by hand.

In addition, in the first embodiment of the double ceramic kiln according to the present invention, as shown in Figure 4, it is also possible to form the inclined surface to narrow the both side wall surface 13 of the first firing chamber (11) upwards.

When both side wall surfaces 13 are formed as inclined surfaces as described above, the heat supplied from the heat source 20 is a space where actual ceramics are not stacked (installing the heat source 20 and forming the discharge hole 24. In order to reduce the amount of heat consumed in order to maintain a predetermined temperature from the wall surface necessary to the space required by the distance from the end surface of the first truck 41 to the predetermined surface), the thermal efficiency is improved.

In addition, when the side wall 13 is formed as an inclined surface as described above, the structure supporting the second firing chamber 12 is made more stable, so that durability and structural strength are improved.

Next, a process of manufacturing ceramics using the first embodiment of the double ceramic kiln according to the present invention made as described above will be described.

First, the porcelain for roasting chaebol is laminated on the first bogie 41 of the above-described bogie 40, and the porcelain for roasting the first bogie is stacked on the second bogie 42.

When the wheel 40 is moved along the rail 4 by rolling the trolley 40 in the state of stacking ceramics as described above, the first trolley 41 is the bottom of the first firing chamber 11. The second bogie 42 is inserted into the bottom of the second firing chamber 12.

As described above, when the trolley 40 is moved along the rail 4 and the front door of the kiln body 10 and the kiln door 30 integrally installed on the trolley 40 abut, the trolley 40 moves to the outside again. Secure them in close contact with each other so that they do not move toward each other.

As described above, when the first bogie 41 and the second bogie 42 are completely inserted into the first firing chamber 11 and the second firing chamber 42, the auxiliary row hole 59 is opened and closed. It is closed using the member 58, and the discharge hole 44 is opened by opening the discharge opening and closing member 26, so that the heat guide 14 is directly connected to the chimney (8). The heat opening and closing member 62 and the discharge opening and closing member 64 are operated.

When the gas burner, which is the heat source 20, is ignited in the above state, the generated heat is supplied to the first baking chamber 11 through the discharge hole 44, and the first baking chamber 11 is used. The heat circulated through the) is guided to the heat guide 14 along the outlet hole 44 and the heat passage 16, and discharged to the outside through the chimney 8.

When the temperature of the first firing chamber 11 is about 600 ° C. by the heat supplied from the heat source 20 as described above, the heat opening and closing member 64 is gradually opened in the horizontal direction from the vertical direction to the above heat induction path ( A part of the heat guided to 14 is moved along the heat inflow path 18 and supplied to the second firing chamber 12 through the inflow holes 19 and 45, and the rest continues to the above described chimneys. It is discharged to the outside through (8).

At this time, the discharge opening and closing member 64 is also gradually opened in the horizontal direction from the vertical direction so that the heat circulated through the second firing chamber 12 passes through the discharge hole 28 and the chimney along the heat induction path 14. Discharge to (8).

When the temperature of the first firing chamber 11 is about 900 ° C., the thermal opening and closing member 64 is operated in a completely horizontal state to block communication between the heat induction path 14 and the chimney 8 and heat The connection between the induction furnace 14 and the heat inlet path 18 is completely opened.

The discharge opening / closing member 64 is also operated in a completely horizontal state so as to completely communicate between the discharge hole 28 and the heat induction path 14.

When the temperature of the first firing chamber 11 reaches a temperature suitable for grilling chaebol (about 1200 to 1300 ° C.), the heat source 20 is extinguished and the discharge opening / closing member 26 is operated to discharge the holes. (24) is closed, and the discharge opening and closing member 64 is operated in a vertical state to close the discharge hole 28 to prevent the discharge of the second firing chamber 12 heat.

At this time, the discharge hole 24 can be closed while adjusting the opening degree as necessary.

In the above state, if the temperature of the second firing chamber 12 does not reach a temperature suitable for first baking (approximately 800 to 900 ° C.), the heat of the first firing chamber 11 is immediately transferred to the second firing chamber 12. The auxiliary opening and closing member 58 is operated to open the auxiliary column hole 59 so as to flow into the opening.

When the temperature of the second firing chamber 12 reaches the proper temperature by the above operation, the auxiliary opening and closing member 58 is operated to close the auxiliary heat hole 59.

When the first baking and the second baking are made for a predetermined time while the heat is trapped in the first baking chamber 11 and the second baking chamber 12 as described above, the discharge opening and closing member 64 is operated by operating the discharge opening and closing member 64. By discharging the internal heat through the chimney (8), the trolley 20 is moved to separate from the kiln body 10, and the chaebol roasting stacked on the first bogie 41 is completed The pottery is unloaded to perform a sorting operation, and the pottery on which the first baking is completed on the second cart 42 is unloaded and sorted, and then stacked again on the first cart 41.

And the second embodiment of the dual ceramic kiln according to the present invention, as shown in Figure 5, the kiln doors (38), 39 are provided so as to open and close the kiln body (10).

That is, the kiln doors 38 and 39 are installed in the kiln body 10 by using a hinge to open and close the first and second firing chambers 11 and 12, respectively.

Also in the above-described second embodiment, the present invention can be implemented in the same configuration as the above-described first embodiment except for the above-described configuration, and thus detailed description thereof will be omitted.

In addition, according to the third embodiment of the dual ceramic kiln according to the present invention, as shown in FIG. 6, the bottom of the first firing chamber 11 and the second firing chamber 12 is provided with a first bogie 41 and a second bogie 42. It is formed integrally with the kiln body 10 without installing it.

As described above, the bottoms of the first firing chamber 11 and the second firing chamber 12 are integrally formed with the kiln body 10 so that the depth of the first firing chamber 11 and the second firing chamber 12 is not deep. It is very effective when it is possible to laminate ceramics without entering the first firing chamber 11 and the second firing chamber 12.

Also in the above-described third embodiment, the present invention can be implemented in the same configuration as the above-described first and second embodiments except for the above-described configuration, and thus detailed description thereof will be omitted.

In the fourth embodiment of the dual ceramic kiln according to the present invention, as shown in FIGS. 7 and 8, the kiln door 30 can be opened and closed simultaneously with the first firing chamber 11 and the second firing chamber 12. It is formed and installed in one, and the heat source 20 is installed in front of the center of the first firing chamber (11).

In the fourth embodiment, the heat emitted from the heat source 20 is moved forward by the supporting plate 66 and the closing member 62 for stacking ceramics, and then the kiln door 30 and the supporting plate 66. Circulating the inside of the first firing chamber 11 from the front through the space between the front and rear, and the outlet hole 64 formed on the rear wall surface of the first firing chamber 11 and connected to the heat guide 14 described above. Configure to discharge through.

In the second firing chamber 12, a partition wall 17 separating the first firing chamber 11 and the second firing chamber 12 is formed with a heat inflow path 18 at predetermined intervals, and the ceramics for the first baking The support plate 68 can be installed.

The fourth embodiment according to the present invention configured as described above is very convenient when producing a small amount of ceramics for testing in a laboratory or the like.

Also in the above-described fourth embodiment, the present invention can be implemented in the same configuration as the above-described first to third embodiments except for the above-described configuration, and thus detailed description thereof will be omitted.

In the above description of the preferred embodiment of the double ceramic kiln according to the present invention, the present invention is not limited to this, but can be carried out by various modifications within the scope of the claims and the detailed description of the invention and the accompanying drawings, This also belongs to the scope of the present invention.

According to the double porcelain kiln according to the present invention made as described above, since it is possible to perform the first roast using the waste heat used for chaebol roasting, the thermal efficiency is greatly increased.

Furthermore, if the second firing chamber is circulated and the heat discharged through the chimney is used to guide the drying chamber, the efficient use of heat is maximized.

In addition, according to the double porcelain kiln according to the present invention, since the first baking is performed simultaneously with the chaebol, it is possible to continuously produce using a single kiln, the production time is shortened and the productivity is greatly increased.

In addition, the installation space for the conglomerate kiln and the first roasting kiln occupy less installation space.

In addition, according to the double porcelain kiln according to the present invention, the heat loss for maintaining a high temperature up to the unnecessary space can be reduced by forming the inclined walls on both sides of the first firing chamber to improve the thermal efficiency.

According to the double ceramic kiln according to the present invention, it is possible to directly supply the high heat of the first firing chamber to the second firing chamber through the auxiliary row hole to maintain the temperature of the second firing chamber to a temperature sufficient for the initial baking.

Claims (9)

A kiln body divided into a first firing chamber communicated through a heat induction path and maintained at a high temperature, and a second firing chamber kept at a lower temperature than the first firing chamber, A heat source installed to apply heat to the first firing chamber of the kiln body, Double porcelain kiln including a kiln door for opening and closing the entrance of the kiln main body. The method of claim 1, wherein the heat flow path is formed on the back surface of the first firing chamber and the second firing chamber to discharge heat circulated to the bottom of the first firing chamber to guide the second firing chamber, Double porcelain kiln connected with chimney for discharge to the outside. According to claim 1, Sliding movement is coupled to the kiln body and forms a floor on which ceramics for firing are laminated, The dual porcelain kiln further comprising a bogie comprising a first bogie forming the bottom of the first firing chamber and a second bogie forming the bottom of the second firing chamber. The method of claim 3, wherein the first trolley has a heat passage connected to a heat induction path for circulating the interior of the first firing chamber and guiding heat discharged to the bottom toward the second firing chamber and the interior of the first firing chamber. Discharges the circulated heat to the floor and forms a plurality of outflow holes to guide the heat passages The partition wall between the first firing chamber and the second firing chamber forms a heat inflow path connected to the heat flow path to guide the heat moving along the heat flow path to the second firing chamber, The heat opening and closing member for opening and closing the communication between the heat inlet and the heat induction path is provided at the portion where the heat induction path and the heat inflow path are connected, The end of the heat inlet is formed by communicating the inlet hole for introducing the guided heat into the second firing chamber, On the rear wall of the second firing chamber is formed a discharge hole for discharging heat toward the chimney of the heat guide, Double porcelain kiln to install the discharge opening and closing member for opening and closing the communication with the heat guide in the discharge hole connected to the heat guide. The double porcelain kiln according to claim 4, wherein said kiln door is integrally provided with said trolley. 5. The partition wall between the first and second firing chambers according to claim 4, wherein heat of the first firing chamber is allowed to flow directly into the second firing chamber without passing through the heat flow path in a portion corresponding to the inflow hole. To form auxiliary column holes, The kiln door is a double porcelain kiln which forms an adjustment hole at a position corresponding to the auxiliary column hole and inserts an auxiliary opening and closing member for opening and closing the auxiliary column hole into the adjustment hole. The double ceramic kiln according to claim 1, wherein both side wall surfaces of the first firing chamber are formed in an inclined surface so as to be narrowed upward. The kiln of claim 1, wherein the kiln door is installed in the kiln main body so as to open and close the first firing chamber and the second firing chamber, respectively. The method of claim 1, wherein the bottom of the first firing chamber circulates the interior of the first firing chamber and the heat passage connected to the heat induction for guiding the heat discharged to the second firing chamber and the first firing chamber Discharge the heat circulated inside to the bottom to form a plurality of outlet holes for guiding the heat passage, The partition wall between the first firing chamber and the second firing chamber forms a heat inflow path connected to the heat flow path to guide the heat moving along the heat flow path to the second firing chamber, The heat opening and closing member for opening and closing the communication between the heat inlet and the heat induction path is provided at the portion where the heat induction path and the heat inflow path are connected, The end of the heat inlet is formed by communicating the inlet hole for introducing the guided heat into the second firing chamber, On the rear wall of the second firing chamber is formed a discharge hole for discharging heat toward the chimney of the heat guide, Double porcelain kiln to install the discharge opening and closing member for opening and closing the communication with the heat guide in the discharge hole connected to the heat guide.