WO2004038315A1

WO2004038315A1 - Continuous furnace

Info

Publication number: WO2004038315A1
Application number: PCT/JP2003/013516
Authority: WO
Inventors: Tadanori Mizoguchi
Original assignee: International Customer Service
Priority date: 2002-10-23
Filing date: 2003-10-23
Publication date: 2004-05-06
Also published as: AU2003277516A1; EP1607704A4; EP1607704A1

Abstract

A continuous furnace, comprising movable furnace units joined to each other for adjusting the burning temperature of molded products, characterized in that a plurality of furnace units are connected to each other through vertically moving shield plates, burner openings are disposed in opposed side walls inside the furnace units so as to be displaced from the opposed positions thereof, and a conveying means passed through the connected furnace units is installed in the furnace.

Description

Specification

Continuous firing furnace

Technical field

The present invention relates to a continuous firing furnace in which a plurality of firing furnaces united according to the amount of a molded article to be fired and the firing time are used in succession.

Background art

Conventionally, there has been a continuous firing furnace in which a continuous firing path is provided in a furnace body provided with partition walls, and molded articles are sequentially loaded into the furnace. Further, a continuous firing furnace has been proposed in which an exhaust port for exhausting exhaust gas burned in a firing passage is provided in the partition wall so that the temperature of a firing region is controlled with high accuracy (see Japanese Patent No. 3218719). (JP-A-6-82162).

In addition, a first baking area, a second baking area, a first cooling area, a second cooling area, and a third cooling area are provided, and these areas are provided with a cooling air supply port, a parner, a residual heat air recovery port, and a gas exhaust port in the furnace. There has also been proposed a continuous firing furnace having a tunnel-shaped furnace body in which an appropriate heat curve is maintained by controlling the temperature of each region (see Japanese Patent No. 2859987 (see Japanese Patent Application Laid-Open No. 5-59987).

No. 172465))).

However, although the continuous firing furnace described in Japanese Patent Application Laid-Open No. 6-82162 has a partition in the firing section, the partition does not move up and down to adjust the temperature inside the furnace, so that the partition The temperature is adjusted by a different structure regardless of the object. Further, in the present invention, the position of the aperture is not set so as to deviate from the opposing position of the opposing side wall so that the combustion gas is swirled and swirled to uniformly hit the molded product. On the other hand, in the continuous firing furnace described in Japanese Patent Application Laid-Open No. 5-172465, the temperature of the molded product is not adjusted by the movement of the partition wall itself, and the combustion gas is uniformly applied to the molded product. Not even a thing.

Disclosure of the invention

An object of the present invention is to solve the above-mentioned problems, and by continuously providing a sintering furnace unit, it is possible to produce a batch type, small to medium size, and even a large type. It is an object of the present invention to provide a continuous sintering furnace.

Another object of the present invention is to provide a continuous firing furnace in which not only a plurality of firing furnace units are connected but also a shielding plate is provided at a predetermined position in the furnace so that the firing temperature between the shielding plates can be adjusted. To provide.

Another object of the present invention is to arrange a wrench so as to deviate from a position facing each other on an opposing side wall so that a swirling flow of gas is generated in the sintering furnace 內 so that a molded article can be sintered substantially uniformly. To provide a continuous sintering furnace.

Still another object of the present invention is to position the shielding plate at a predetermined height above the conveying means in the furnace, that is, at a height at which a molded article can pass through the conveying means, and at a position above and below the conveying means. And to provide a continuous firing furnace that can be fired with a wrench. Another object of the present invention is to provide a combustion fan for conveying air and gas into the furnace and an exhaust fan for forcibly exhausting exhaust gas to the outside at the front and rear of the firing furnace, so that it can be performed in a short time. An object of the present invention is to provide a continuous firing furnace that can provide ceramic products.

The object of the present invention is, in particular, to move the firing furnace to a building, a house, a tunnel, a highway building site, to a place where incinerated ash or the like can be used for ceramic products, or to a customer's factory premises, and to move the furnace. It is an object of the present invention to provide a continuous firing furnace for finishing a heat treatment apparatus for ceramic electronic components used in automobiles and the like, in addition to ceramic products such as tiles, bricks, and exterior panels in place.

SUMMARY OF THE INVENTION The present invention has been made in view of the above objects, and its gist is to control a firing furnace unit, a parner for injecting gas into the unit, and control of ignition of the gas of the parner, flame amount and time, and fire extinguishing. A baking furnace comprising a control panel, wherein a plurality of baking furnace units of the baking furnace are connected via a shielding plate for controlling a temperature in the furnace, and at least a part of the plurality of baking furnace units is provided. In order to forcibly generate a swirling flow of the flame in the furnace, the burners are displaced from the positions facing each other at required locations on the opposing side walls of the respective firing furnace units, and the plurality of the continuous The present invention relates to a detachable and movable continuous firing furnace characterized in that a transfer means passing through the firing furnace unit is installed.

Thus, according to the present invention, by continuously forming the required number of firing furnace units, a continuous firing furnace having a scale corresponding to the size, shape, amount, etc. of the molded product can be obtained. Shielding plates were provided at required locations to enable temperature adjustment between each shielding plate. Further, in the firing furnace unit between the shielding plates, a gas flame is uniformly applied to the molded product by the swirling flow, so that a better ceramic product can be obtained. In addition, since the corners of the sintering furnace are positioned so that the corners of the squeezing furnace deviate from the positions facing each other on the opposite side wall of the sintering furnace unit, a swirling flow can be forcibly generated in the unit. As a result, it is possible to irradiate the molded article with the flame substantially uniformly.

Furthermore, in the present invention, the continuous firing furnace can be transported and moved to a construction site such as a tunnel or the site of a customer's factory, so that ceramic electronic parts such as tiles and ceramic parts such as automobile parts can be moved in the same place. By firing the heat-treated product as a metal product, ceramic products can be fired in a short time with almost no stock of ceramic products, and overall costs have been saved.

Furthermore, in the present invention, the firing furnace is made movable, and the continuous firing furnace is used at a construction site such as a building. Since it can be fired, warehouses and transportation for storing these products in different locations can be omitted, and efficient and cost-effective ceramic products can be obtained. Further, as another gist of the present invention, when the furnace body is formed into a substantially square cylindrical body including a pair of opposed side walls, one of the parner ports is provided at a position where the opposed position of each side wall is removed. A total of two tubes are provided, and a force to turn the flame from the two wrench openings into a left or right swirling flow, two at each of the upper and lower positions excluding the opposing position of each side wall, a total of four, It is characterized in that the swirling flow of the upper and lower flames from the four wrench openings is turned leftward or rightward in the same direction, and is located at a position opposite to the above.

According to the present invention, one opener is provided on each side wall of the substantially square tube of the furnace body, and if the opener is located in the vicinity of the lower right corner on one side wall, the open side wall may be located on the opposite side wall. Position the wrench inward near the lower right corner. With this position, the flames from each of the two corners turn to the left because the two lower corners are out of the opposite position.

In addition, when two wrench are arranged on the side wall of the approximately square tube of the furnace body, the wrench opening on one side wall is near the upper right corner and the lower left corner, and on the opposite side wall is here Again, it is placed near the upper right corner and near the lower left corner. Such a barnaro deviates from the opposing position on each opposing side wall, in other words, when seeing through the opposing side wall from one side wall side (since it is located near the upper right corner on each side wall), Flames are fired from the upper right corner (corner) of the side wall from the upper right corner (corner) to the opposing side wall, but the flame of the upper right corner (corner) of the other side is fired from the one side wall. The flame is fired from the upper left corner on the opposite side to the upper left corner on the near side, and the flame turns left. The flame from the two corners near the lower left corner of the side wall is also fired from one side wall to the opposite side wall, so that the inside of the furnace turns clockwise, contrary to the above.

In the above description, the wrench opening is provided on the side wall in the vicinity of the upper right corner, facing inward. However, when these are provided near the upper left corner, the flame turns right inside the hut unlike the above. In the above description, the side walls are provided in the vicinity of the lower left corner toward the inside. However, if these are provided near the lower right corner, the flame will turn left inside the unit.

Therefore, the corner at the corner of the side wall is designed so that the upper and lower flames are turned to the right or left by turning the upper and lower flames to the right and left, respectively. Others can also turn left.

In order to inject gas into the furnace, for example, when one wrench opening is located near the upper right corner on each side wall, the right half of the inside of the opposite side wall fires toward the opposite side wall. On the other hand, the direction of the flame from the Pana port near the upper right corner of the opposing side wall is directed toward the inside of the left half of the side wall. By automatically or manually moving the flame by the control panel, it is possible to apply the optimal flame flow according to the size of the molded product within a range that does not disturb the smooth swirl flow to the right or left.

As another gist of the present invention, the shielding plate is moved laterally into the furnace so as not to hit the molded product in the furnace sent by the conveying means, and the height of the shielding plate is vertically increased in the furnace. By moving and adjusting, the temperature between the shield plates can be adjusted more finely.

In the present invention, the height of the shielding plate between firing furnaces is moved up and down manually or automatically by control from a control panel, and the time and temperature required for firing are controlled to desired values in relation to the transport means. By doing so, it is possible to obtain fast and uniform ceramic products.

Further, by moving the shielding plate of the present invention laterally into the furnace and vertically moving the shielding plate vertically from the outside of the furnace, heat leakage can be prevented by moving the shielding plate up and down from both sides of the furnace ceiling. Further, as another gist of the present invention, the shield plate is moved left and right in the furnace so as to be able to be removed so as not to hit the molded product sent by the transfer means. In the present invention, the shielding plate is moved laterally in the furnace to the left and right, thereby facilitating the temperature adjustment in the furnace and the maintenance such as repair or replacement by pulling out the shielding plate from either the left or the right. Furthermore, as another gist of the present invention, the above-mentioned shielding plate is divided into an upper stage and a lower stage above the conveying means, and the lower stage can be moved up and down or left and right. The product can be baked so that it can be used in a variety of designs.In addition, it is possible to bake the molded product over a wide range from above and below the rollers of the conveyance means, and to make the molded product uniform. To be burned. '' Then, the height of the lower shielding plate was automatically or manually adjusted using a lifting device such as a power cylinder or a screw screw, so that the temperature in the furnace was adjusted in more detail. Another gist of the present invention is that the conveying means is a heat-resistant roller which rotates on bearings, and a burner is arranged so as to bake the above-mentioned molded article from above and below the roller to achieve heat. As another gist of the present invention, a molded product is fired by feeding air and gas from a combustion fan into the furnace at a front portion of a continuous firing furnace, and discharging exhaust gas to the outside with an exhaust gas fan, At the rear of the firing furnace, air or cold air is sent from the cooling fan into the furnace, and the hot exhaust air inside the furnace is discharged to the outside by the cooling exhaust fan, thereby rapidly cooling the furnace and shortening the firing time. I was sorry.

In the present invention, air and gas are introduced into the first half of the continuous firing furnace, and air or cold air is forcibly fed in the second half to exhaust the exhaust gas and combustion air from the furnace, respectively. The molded product can be quickly fired by introducing air into the furnace.

In the continuous firing furnace of the present invention, a plurality of firing units are formed continuously through a shielding plate, so that the type and size of ceramic products, for example, ceramic electronic components used for building supplies such as tiles and automobile engines, etc. A continuous firing furnace can be formed according to the ceramic products.

In the firing furnace, the parner ports on the side wall of the furnace are placed away from the opposing positions, that is, the flame from the parner ports arranged on the two opposing side walls turns left or right in the unit. With this configuration, it is possible to obtain a ceramic product that is uniformly baked in a short time by making the flame hit the molded product located at the center of the side wall substantially uniformly.

Further, in the present invention, by moving the shielding plate up and down in the furnace, the temperature in the furnace divided by each shielding plate can be adjusted according to the type and size of the molded article to be fired. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is an overall schematic diagram of the continuous firing furnace of the present invention.

FIG. 2 is a partially enlarged detailed view of FIG.

FIG. 3 is a cross-sectional view taken along line AA of FIG.

FIG. 4 is a graph showing the relationship between the firing time (60 minutes) of ceramic articles in the continuous firing furnace of the present invention and the temperature.

FIG. 5 is a diagram showing the gas and air supply path of the burner of FIG. 1 and the exhaust gas discharge path.

FIG. 6 is a partially enlarged detailed view of another continuous firing furnace different from FIG.

FIG. 7 is a cross-sectional view taken along line BB of FIG.

FIG. 8 is a graph showing the relationship between the firing time (20 minutes) and the temperature of ceramic articles using FIGS. 6 and 7, which are another embodiment of the present invention.

FIG. 9 is a schematic diagram showing the temperature relationship and the total furnace length in a conventional baking time of 20 minutes. FIG. 10 is a graph showing the relationship between the temperature and the time of the annealing step of the stainless steel part used for high-temperature exhaust from the engine, in comparison with the example in which the ceramic product is a tile in FIGS. 4 and 8. FIG. 11 is a graph showing the relationship between the temperature and time in the annealing step in which the same automotive component as in FIG. 10 was performed in a shorter time.

Preferred embodiments of the invention

According to the present invention, a continuous firing furnace suitable for each brand can be obtained by forming a continuous firing furnace using a required number of firing furnace units and shielding plates.

Further, between each shielding plate, a combustion condition according to the shielding in the furnace can be obtained. Furthermore, in the firing furnace between the shielding plates, the burner of the swirling flow and the vortex flow enabled more uniform combustion of the molded product due to the opening of the parner opening.

Example

Preferred embodiments of the present invention will be described with reference to the accompanying drawings.

Example 1

Fig. 1 is a schematic vertical sectional view of a continuous firing furnace in which firing furnace units are connected in a horizontal line. Fig. 2 is a partially enlarged explanatory view of Fig. 1, Fig. 3 is a cross-sectional view taken along line A-A of Fig. 2, and Fig. Fig. 5 is a graph showing an example of the relationship between the firing time and the firing temperature for producing the ceramic article according to the invention. Explanatory drawing showing the path of the combustion fan → inside the furnace → exhaust gas fan and cooling fan → inside the furnace → cooling and exhaust fan, Fig. 6 is a partially enlarged detailed view of a continuous firing furnace different from Fig. 2 Fig. 7 is a cross-sectional view of B-B of Fig. 6, and Fig. 8 is 10 pieces (1 Om) of one piece with one lm firing unit for firing ceramic products with a firing time of 20 minutes. Fig. 9 is a graph of the present invention showing the burning temperature and burning time of the continuous burning furnace according to the invention, and Fig. 9 shows a conventional example of a continuous burning furnace having a total length of 45 m when the burning time is 20 minutes in Fig. 8. Is shown.

1, 1, 2 and 3, 1, 1 ', 1 "· ·' indicate one unit (one unit) of firing furnaces, and these are connected to form a continuous firing furnace A. Firing furnace A Is a maboco-type tubular tunnel 2 as a furnace body consisting of a ceiling 4 3, side walls 49, partition walls 5, and a hearth 45 made of refractory metal (especially made by AG Block Marukoshi Kogyo Co., Ltd.). At the boundary of each of the furnace units 1, 1 ', 1 " At the same time, the above-mentioned bulkhead 5 and hearth 45 are made of refractory brick in the lower half. In addition, the cylindrical tunnel 2 penetrating in the axial direction of each of the firing furnace units 1, 1, 1, 1 "... Has a bearing 7 on the bearing 7 in one direction from left to right in FIG. Endlessly rotating conveyance means, that is, a number of heat-resistant ceramic rollers 6 as endless conveyors 12 support their roller shafts with the furnace body (not shown), and these are motors 10 and pulleys. It is connected to the chain 11 and the endless conveyor 12 so as to be rotatable.

As shown in FIG. 1, the shielding plate 4 may be provided for each firing furnace unit, but one shielding plate is provided for two or more firing units in accordance with the firing conditions of the molded product. Can be. The shielding plate 4 is moved up and down by penetrating the ceiling between the baking furnace units by the power cylinder 3 by means of a force automatically performed through a reaction plate 8 fixed to the furnace body or a manual operation. Can be. The screw 9 is screwed to the reaction force plate 8 for adjusting the length of vertical movement of the shield plate 4 by the power cylinder 3.

On the side wall 49 of the baking furnace units 1, 1, and 1 ", the parners 14, 15, 15 and 16 and 17 are arranged so that two opposing positions are removed from the upper and lower sides, respectively. If a flame is radiated from the upper part of the side wall 49 of the side wall 49, the other side wall radiates the flame in the same manner as above (the same applies to the lower side). Side, 49 opposite side walls 49 are provided with wrench openings 14, 15, 15, 16, 17 (In the drawing, the upper corner of one side wall is located at the upper right corner and the lower corner is located at the lower left corner).

This is because when the left and right walls of the kiln unit 1, 1 ', 1 " 1 and 16 on each of the left and right walls in the tunnel axis direction of the upper half (on the transport means), and one each on the left and right walls of the tunnel axis in the lower half (below the transport means). In order to cool the molded product, the conveyor opening is located at the back of the firing furnace (right side in Fig. 1). 2 There may be two on either side of the left and right walls only, one on each of the left and right walls (total of two), or none at all depending on the design.

As shown in Fig. 5, in continuous firing furnace A, gas and air are injected into the furnace from the parner ports 14 to 17 in the first half of the firing furnace, and an ignition instruction is issued from a control panel (not shown). A combustion fan 30 that is made to burn by (path 32), and a gas that has been burned in the furnace is exhausted from the combustion stack 22 to the outside of the furnace by an exhaust gas fan 20 (path 33) In the latter half of the firing furnace, cool air (air) is sent out from the cooling fan 31 into the furnace (path 34) and the cooling exhaust fan 21 discharges combustion gas from the cooling discharge tube 23 to the outside of the furnace. (Path 35).

The process of firing a tile under the control of a control panel (not shown) using a continuous firing furnace having the above configuration will be described below.

In Fig. 4, assuming that the baking process inside the medium-scale continuous baking furnace is 60 minutes from the beginning to the end, the first 7 minutes are used to dry the molded product with one or two parners in one baking furnace unit. A drying step 24, in which the molded article is baked with 3-4 pliers for the next 14 minutes, and a high-temperature holding step 26, in which calcination is performed with all four wrench parts, for 9 minutes. Stop the four panners and perform a quenching step 27 for 6 minutes, a slow cooling step 28 for 12 minutes with one or two parners, and a cooling step 29 for 12 minutes with all the panners stopped. Partition into 60 minute steps. Then, in the drying process of the molded product, the temperature inside the furnace unit was gently increased from 144 ° C to 271 ° C, and then, the heating power was increased by increasing the amount of gas burned by the parner in the temperature raising process. And, by lowering the shielding plate inside the furnace, it passes through the furnace unit whose temperature has rapidly risen to 790 ° C, and further lowers the shielding plate 4 to the extent that molded products can pass through, so that the inside of the furnace unit While controlling the temperature rise, the furnace unit raised to the maximum temperature of After passing for 9 minutes as a high temperature holding step, the atmosphere was put into the furnace unit in the quenching step to lower the temperature to 675 ° C, and then the average temperature of the tunnel in the slow cooling step was 573. Then, the shield plate 4 is cooled in the cooling process with the raised shield plate 4, so that the porcelain product is fired as a ceramic product.

Example 2

In FIGS. 1 to 5 of the first embodiment, in the baking furnace units 1, 1 ', 1 ", the shielding plate 4 penetrating the ceiling 4 3 is moved up and down by the power cylinder 3, and all 6 units are used. Although described in the baking process of 0 minutes, in another embodiment shown in FIGS. 6 to 8 below, both sides of the endless conveyor 12 between the baking furnace units 1, 1, 1, 1,. Side walls 49 are provided with alternate slits 36 at the top and bottom where two shielding plates are vertically shifted like a sliding door and inserted from the horizontal direction, and fixed in the upper right of Fig. 6 in these slits 36 The upper shielding plate 42 is inserted, and the lower shielding plate 43 is positioned in the lower left so as to be vertically movable within the slit 36 so as to partially overlap the upper shielding plate 42. In order to move the shielding plate 43 up and down, the cylinder rod 46 is extended and contracted with the power cylinder 3 fixed to this. The outer cylinder of the cylinder rod 46 is provided with an outer cylinder screw 48 screwed to a flange 47 fixed to the furnace body, so that the entire power cylinder 3 can be moved up and down. Adjust the width of the stretch length.

In Figs. 6 to 8, the firing process is performed by using one firing furnace unit 1, 1 ', 1 " This embodiment will be described in comparison with a conventional sintering furnace with the same sintering time of 20 minutes in the 5 m × 9 section-total length 5 m in FIG.

The upper diagram in FIG. 8 shows the relationship between the firing time and the firing temperature of the molded article in the 10 firing furnace units shown in the lower diagram. According to the figure, the first 2 minutes of the molded product is a drying process from 230 ° C to 300 ° C, the next 6 minutes is a heating process to 1200 ° C, A high-temperature holding step at 1200 ° C for about 15 seconds is a rapid cooling step to reduce to 573 ° C in 4 minutes, and a gradual cooling step to 475 ° C in 3 minutes 45 seconds To lower the temperature, and finally, after a cooling process for 2 minutes, finish the ceramic products in a total of 20 minutes.

Note that in FIG. 9, in order to turn the molded article into a ceramic product in the same firing time as in Example 2 above, a firing furnace having a total length of 45 m was required, but in the present invention, the total firing furnace length was 10 m. And pole Shortened to the end. The first reason was that the height of the shielding plate between each firing furnace unit could be adjusted, and the second was that the flame was swirled so that it could hit the molded product evenly. The corners of the wrench are on the upper and lower side walls of the transfer means, for example, by shifting the positions opposite to each other. (The solid square in Fig. 5 is for irradiating the flame from the near side, and the dotted square is the wrench for irradiating from the far side to the front.) By increasing the temperature inside the furnace rapidly by arranging two on the side walls 49, and quickly extinguishing the fire and sending cool air into the furnace, the firing temperature can be increased while maintaining the temperature required for firing. This is due to speeding down.

In particular, the second embodiment of the present invention is different from the first embodiment in that the upper and lower shielding plates 42, 43 between the respective firing furnace units are made by sealing the entire ceiling 43 with firebrick. Then, it is moved laterally from the gap (not shown) in one side wall 49 of the firing furnace unit toward the other side wall, and the lower shielding plate of the upper and lower shielding plates is outside the side wall by a power cylinder. The temperature is adjusted between the baking furnace units above the transfer means by raising and lowering it from both sides of the furnace within the range of the slit 36 in the furnace (nearly double the length in the figure). There is a gap high enough to allow the molded product on the conveying means to be sent through the firing furnace so as not to hit the shielding plate.) Of course, the left and right side walls are provided with a gap (not shown) enough to accommodate the thickness of the shielding plate, and after the shielding plate is pushed into the furnace and wrapped around both side walls, the gap is removed by the ceramic fiber. With fire-resistant fibers. As means for moving the lower shielding plate up and down in the slit 36, it is conceivable that the lower shield plate is automatically moved in and out manually by the cylinder or the like.

Example 3

Next, using the continuous firing furnace of the present invention, stainless steel automotive parts (hereinafter referred to as metal parts) used for engine parts and the like are annealed instead of the ceramic articles (performed after pressing stainless steel). Will be described.

This metal part is repeatedly pressed for forming, but if it is not annealed, it will break at the place where stress is concentrated by the press, so press → annealing → press → annealing → press → annealing .

Therefore, the pressed metal parts are made of refractory and have a thickness of 5π! The setters were placed side by side on a thin plate (called a setter) of about 8 m in length, and the setter was placed on a ceramic roller 6 as a transport means of the continuous firing furnace shown in FIG. 5 and passed through the furnace. According to FIG. 10, this entire annealing process Starting from around 120 ° C, gradually raise the temperature to the maximum temperature in 6 and 3 minutes, maintain the temperature for about 4 minutes, then rapidly cool in about 22.8 minutes and then in about 2 minutes, Finally, cool slowly until about 8.2 minutes later to finish annealing.

According to the above example, the conventional annealing, which took 45 minutes in total, could be completed in 21 minutes. The reason is that the flame amount of the wrench can be finely adjusted between the shielding plates.The air and gas are introduced from the combustion fan into the furnace in the first half of the firing furnace 內, and the exhaust gas in the furnace is exhausted by the exhaust gas fan. In the furnace in the second half of the process, air or cold air is sent into the furnace, and the air in the furnace is exhausted to the outside by a cool air exhaust fan, which results in rapid combustion and cooling. Due to having made it possible.

Example 4

The embodiment of FIG. 11 shows the annealing of the same automobile part as that of FIG. 10 described above in a shorter time. Raise the temperature until 8 minutes later, then hold the maximum temperature (1100 ° C) for about 3.7 minutes (about 8.5 minutes from the beginning) for about 3.7 minutes, and then for 1.5 more minutes. It was quenched and the remaining 6 minutes were used as a slow cooling process.

In this embodiment, a shorter part than that of the previous embodiment is obtained by annealing an automobile part in 16 minutes.

In each of the above embodiments, ceramic products were mentioned, but in the present invention, various types of products are used depending on the mounting of the shielding plate, height adjustment, the burning temperature and time of the wrench, the cooling temperature and time of cooling air, and the like. Needless to say, it can be set accordingly.

Claims

The scope of the claims

A firing furnace, comprising: a plurality of firing furnace units; a burner for injecting gas into the unit; and a control panel for controlling ignition of the gas of the burner, flame amount and time, and fire extinguishing.

A plurality of sintering furnace units of the sintering furnace are connected through a shielding plate for controlling the temperature in the furnace, and at least a part of the plurality of sintering furnace units is forcibly swirled by a flame in the furnace. The above-mentioned opener ports are arranged so as to be disengaged from the positions facing each other at required positions on the opposing side walls of each of the firing furnace units, and a transfer means is provided for penetrating the plurality of continuous firing furnace units. A detachable and movable continuous firing furnace.

When the furnace body is a substantially rectangular cylinder including a pair of opposed side walls, the burner is provided at a position where the opposed position of each side wall is removed, a total of two burners, and the two burners are provided. Force to turn the flame from the wrench opening into a left or right swirling flow, two at each of the upper and lower positions, excluding the opposing positions on each side wall, a total of four, and above and below the four wrench openings 2. The continuous firing furnace according to claim 1, wherein the swirling flow of the flame is turned to the left or right.

2. The continuous firing furnace according to claim 1, wherein the direction of injection of the parner port into the furnace body is automatically or manually moved by the control panel so that the control port can be controlled.

The firing temperature can be adjusted for each firing furnace unit by vertically moving the shielding plate up and down within a range of a height of the furnace that does not hit a molded article conveyed on the conveying means. Range 1 continuous firing furnace.

.. The continuous firing furnace according to claim 1, wherein said shield plate can be removed by laterally moving left and right at a height within the furnace which does not hit a molded article conveyed onto said conveying means.

The vertically or horizontally moving shielding plate is divided into an upper stage and a lower stage above the conveying means so that the lower stage can be moved up and down or left and right, and a molded article can be fired with a parner from above and below the conveying means. The continuous firing furnace according to claim 1.

7. The lower shielding plate according to claim 6, wherein the temperature of each firing furnace unit can be adjusted by automatically or manually adjusting the height from outside the firing furnace unit by using a lifting means. Continuous firing furnace.

2. The continuous firing furnace according to claim 1, wherein said conveying means is a heat-resistant roller rotating on a bearing, and a parner is disposed so as to fire the molded article from above and below said roller. At the front of the baking furnace, which consists of a plurality of baking furnace units, air and gas are sent into the furnace from a combustion fan, and the exhaust gas fan discharges the exhaust gas from the furnace to the outside. An exhaust pipe is provided, and at the rear of the continuous baking furnace, air or cold air is sent into the furnace from the cooling fan power, and the cooling exhaust fan discharges the air inside the furnace to the outside with a cooling exhaust fan. The continuous firing furnace according to claim 1, wherein a tube is disposed.