JP2002130956A - Continuous baking furnace and its using method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a continuous baking furnace formed that a cooling chamber is short and a tray can be reliably conveyed. SOLUTION: The continuous baking furnace comprises deaerating chamber 23 on the incoming side through which the tray 22 can pass; a preheating chamber 37 in which the trays 22 are fed, in order, from the deaerating chamber 23 on the incoming side; a heating chamber 39; a cooling chamber 39; a deaerating chamber 28 on the outgoing side through which the tray 22 through the cooling chamber 39 can pass; a pusher 35 to push the tray 22 in the preheating chamber 37 from the deaerating chamber 23 on the incoming side; a puller 36 to pull out the tray 22 from the cooling chamber 39 to the deaerating chamber 26 on the outgoing side; an intermediate door 42 situated between the heating chamber 38 and the cooling chamber 39; and an intermediate puller 43 to pull out the tray 22 from the heating chamber 38 to the cooling chamber 39. The intermediate door 42 is set to a closed state, input of heat to the cooling chamber 39 is suppressed, and further, movement in the cooling chamber 39 of the tray 22 is effected by an intermediate puller 43, and the number of the trays 22 to be pressed by the pusher 35 is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous firing furnace and a method for using the same.

[0002]

2. Description of the Related Art FIGS. 8 and 9 show an example of a conventional continuous firing furnace. This continuous firing furnace has an inlet-side deaeration chamber 3 through which a tray 2 on which a firing object assembly 1 is placed can pass. A firing furnace main body 5 installed in a chamber 4 connected to the inlet-side degassing chamber 3 and in which a plurality of trays 2 arranged in a line are sequentially fed from the inlet-side degassing chamber 3; And an outlet-side degassing chamber 6 through which the tray 2 having passed through can pass.

A space between the inner surface of the chamber 4 and the outer surface of the firing furnace body 5 is filled with a heat insulating material (not shown), and the chamber 4 has a double wall water cooling structure.

The entrance-side deaeration chamber 3 and the exit-side deaeration chamber 6 have doors 7, 8, 9, 10 that can be moved up and down respectively at an upstream portion and a downstream portion in the tray 2 transport direction.

When the doors 7, 8, 9, and 10 are set to the lowered positions, the air-tightness of the inlet-side deaeration chamber 3, the chamber 4, and the outlet-side deaeration chamber 6 is maintained, and the doors 7, 8 , 9, and 10 are set to the raised position, a state where the passage of the tray 2 is allowed.

A pair of left and right skid beams 11, 12 and 13 slides the tray 2 from below into the inlet deaeration chamber 3, the firing furnace main body 5 and the output deaeration chamber 6 over substantially the entire length thereof. It is provided to be movably supported.

[0007] Inside the middle portion of the firing furnace body 5 in the longitudinal direction,
A plurality of heaters 14 extending vertically are arranged so as to be located on both the left and right sides of the firing object aggregate 1 on the tray 2.
Is heated.

Further, a pusher 1 for pushing the trays 2 one by one from the inlet side deaeration chamber 3 to the firing furnace main body 5 is provided in the continuous firing furnace.
5 and a puller 16 for pulling out the trays 2 one by one from the firing furnace main body 5 to the outlet side deaeration chamber 6 are attached.

When operating the continuous firing furnace, the door body 8,
While the furnace 9 is closed, the firing furnace main body 5 is filled with a non-oxidizing gas, and the heater 14 is operated to heat the firing furnace main body 5 to a preset temperature.

Next, the tray 2 on which the assembly 1 of firing objects is placed is carried into the inlet-side degassing chamber 3, the door 7 is closed, and the air in the inlet-side degassing chamber 3 is discharged to the outside. Thereafter, the door 8 is opened, and the tray 2 is pushed into the firing furnace body 5 by the pusher 15 to close the door 8 again.

After a predetermined time has elapsed, another tray 2 is pushed into the firing furnace main body 5 from the inlet-side deaeration chamber 3 by the above-described procedure, and is already pushed into the inlet-side deaeration chamber 3 by the tray 2. The tray 2 is pushed out toward the outlet side deaeration chamber 6.

By repeating such operations, when the tray 2 has advanced to the most downstream side in the transport direction of the firing furnace main body 5, the door 9 is opened with the door 10 closed, and the puller 1 is opened.
The tray 2 is drawn out of the firing furnace main body 5 into the outlet side degassing chamber 6 by the use of the door 6, and the door 9 is closed, the door 10 is opened, and the tray 2 is taken out.

As a result, the temperature of the sintering object assembly 1 is gradually increased over a predetermined time in the preheating chamber 17 near the inlet-side deaeration chamber 3 in the sintering furnace main body 5. Is heated to a constant temperature for a predetermined time in a heating chamber 18 in an intermediate portion of
Further, it is gradually cooled in the cooling chamber 19 in the part of the firing furnace body 5 near the outlet side degassing chamber 6 over a predetermined time.

In the continuous firing furnace having the above-described structure, when it is necessary to increase the production amount with the same furnace sectional area, the heating chamber 18 is set long and the moving speed of the tray 2 is increased.

When it is necessary to produce a large variety of products in small quantities, the heating chamber 18 is set short and the moving speed of the tray 2 is reduced to reduce the number of lots.

[0016]

The continuous firing furnace shown in FIGS. 8 and 9 is suitable for mass production of a single product, but the heating chamber 18 is set short to lower the moving speed of the tray 2. In small-quantity production of many kinds, the tact time of the firing object aggregate 1 is prolonged, the heat loss of the heating chamber 18 is increased, and the cooling chamber 1 is increased.
Since the heat is input to the cooling chamber 9, the cooling chamber 19 must be set long so that the cooling time of the firing target aggregate 1 is sufficiently long.

Since the cooling chamber 19 is always in communication with the heating chamber 18, if different processing gases are used for the processing gas in the heating chamber 18 and the cooling chamber 19, the two processing gases are mixed. Resulting in.

Further, the tray 2 pushed into the preheating chamber 17 from the inlet-side degassing chamber 3 by the pusher 15 already has the preheating chamber 17,
Since the plurality of trays 2 arranged in the heating chamber 18 and the cooling chamber 19 are pushed out to the downstream side in the transport direction, the heating chamber 18
It is not possible to provide an intermediate door between the cooling chamber 19 and the cooling chamber 19 to avoid mixing of the processing gas.

In addition, if the upper surface of the skid beam 12 forming the transfer path of the tray 2 is distorted in a wavy shape or if a step is formed on the upper surface of the skid beam 12, the rows of the tray 2 can be smoothly arranged. Stopped moving,
As shown in FIG. 10, it floats up like a bridge.

At this time, when the pushing load of the tray 2 by the pusher 15 is increased, the row of the tray 2 jumps up and buckles.

The present invention has been made in view of the above circumstances, and has as its object to provide a continuous firing furnace capable of improving the energy efficiency of the entire furnace and reliably transporting the tray, and a method of using the same.

[0022]

In order to achieve the above object, in the continuous firing furnace according to the first aspect of the present invention, an inlet-side degassing chamber through which a tray on which a set of objects to be fired is placed can pass. A preheating chamber, a heating chamber, and a cooling chamber into which trays are sequentially sent from the inlet-side degassing chamber; an outlet-side degassing chamber through which the tray passes through the cooling chamber; and a preheating chamber from the inlet-side degassing chamber. Pusher that pushes the tray into the chamber, a puller that pulls the tray from the cooling chamber to the outlet side deaeration chamber, an intermediate door that can be opened and closed between the heating chamber and the cooling chamber, and an intermediate door that pulls the tray from the heating chamber to the cooling chamber With puller.

Further, in the continuous firing furnace according to the second aspect of the present invention, a number of free rollers for supporting the tray from below are disposed over substantially the entire length of the preheating chamber, the heating chamber, and the cooling chamber.

In the method of using the continuous firing furnace according to the third aspect of the present invention, the intermediate door is set to the open state, and the tray located at the most downstream side in the transport direction of the heating chamber is cooled by the intermediate puller. After the tray is drawn into the chamber and the tray already located in the cooling chamber is pushed out by the tray to the downstream side in the transport direction, the intermediate door is set to a closed state.

Further, in the method for using the continuous firing furnace according to claim 4 of the present invention, the pushing load of the pusher when the row of trays which are pressed to the downstream side in the transport direction by the operation of the pusher rises in a bridge shape, If the push load of the pusher reaches the above-described pressing interrupted load due to the pressing of the tray to the downstream side in the transport direction, the operation of the pusher is temporarily interrupted.
The tray is pressed again by the pusher.

In any of the continuous firing furnaces according to the first and second aspects of the present invention, the tray is drawn out of the heating chamber into the cooling chamber by an intermediate puller, and the intermediate door is set to a closed state. Suppresses heat input to the cooling chamber.

[0027] In the continuous firing furnace according to the second aspect of the present invention, the tray is supported by a number of free rollers arranged in the preheating chamber, the heating chamber, and the cooling chamber to facilitate the movement of the tray.

In the method of using the continuous firing furnace according to the third aspect of the present invention, the tray is moved from the heating chamber to the cooling chamber by an intermediate puller so that the intermediate door can be set to a closed state, and the cooling is performed. Suppress heat input to the room.

In the method of using the continuous firing furnace according to the fourth aspect of the present invention, the presence or absence of the lifting of the rows of the trays is determined based on whether or not the pushing load of the pusher has reached the previously determined pressing interruption load. When the pressing load reaches the pressing interrupted load, the operation of the pusher is temporarily interrupted to eliminate the lifting of the tray row, and the conditions of the raised portion are changed, and Is advanced according to the pushing load of the pusher.

[0030]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 to 6 show an embodiment of a continuous firing furnace according to the present invention. In the drawings, the portions denoted by the same reference numerals as those in FIGS. 8 and 9 represent the same components.

The continuous firing furnace includes an inlet-side deaeration chamber 23 through which a tray 22 on which the firing target assembly 1 is placed can pass,
A chamber 24 connected to the inlet-side degassing chamber 23, and a firing furnace body 25 into which a plurality of trays 22 installed in the chamber 24 and arranged in a line are sequentially fed from the inlet-side degassing chamber 23.
A discharge-side degassing chamber 26 connected to the chamber 24 and through which the tray 22 passing through the firing furnace main body 25 can pass; and a tray extending over substantially the entire length of the firing furnace main body 25 and a portion of the chamber 24 near the downstream end in the tray 22 transport direction. A plurality of free rollers 32 pivotally supported so as to be in contact with the lower surface of the boiler 22; a plurality of lower heaters 34 disposed within a predetermined range in the firing furnace main body 25 so as to be located between the free rollers 32; A plurality of upper heaters 44 are provided in a predetermined range of the firing furnace main body 25 so as to be located above the passage path of the body 1.

A space between the inner surface of the chamber 24 and the outer surface of the firing furnace body 25 is filled with a heat insulating material (not shown), and the chamber 24 has a double wall water cooling structure.

In the firing furnace body 25, the firing object inlet end is adjacent to the inlet-side degassing chamber 23, and the firing object outlet end is separated from the outlet-side degassing chamber 26 by a predetermined distance. A cooling chamber 39 is formed between the product outlet end and the outlet side deaeration chamber 26.

As a material of the firing furnace main body 25, graphite having excellent heat resistance is used.

Further, intermediate doors 41 and 42 having a gas tight structure and capable of moving up and down are provided at the entrance end and exit end of the firing object of the firing furnace main body 25, respectively.

When the intermediate doors 41 and 42 are set at the lowered position, heat loss of the firing furnace main body 25 is suppressed, and when the intermediate doors 41 and 42 are set at the raised position, the tray 22 is allowed to pass through.

The entrance-side deaeration chamber 23 and the exit-side deaeration chamber 26 have doors 27, 28, 29, 30 which can be moved up and down at the upstream and downstream positions in the tray 22 transport direction, respectively.

When these doors 27, 28, 29, 30 are set to the lowered position, the airtightness of the inlet-side degassing chamber 23, the chamber 24, and the outlet-side degassing chamber 26 is maintained.
When 7, 28, 29, and 30 are set to the raised positions, the passage of the tray 22 is allowed.

The free roller 32 is a bracket 32 at the upper end of a column 32a that is erected on the inner bottom surface of the firing furnace body 25 or the like.
b.

The row of free rollers 32 is
Two trays are arranged side by side in the width direction of the tray 22 such that the free rollers 32 are in contact with the lower side near the one side in the width direction and the side closer to the other side in the width direction, respectively.

The inlet-side degassing chamber 23 and the outlet-side degassing chamber 2
In 6, the free rollers 31, 33 are arranged so as to be in contact with the lower surface of the tray 22 with the same pivotal support structure as the above-described free roller 32.

The lower heater 34 and the upper heater 44 are arranged in a range except for a part near the inlet-side degassing chamber 23 of the firing furnace main body 25 to be the preheating chamber 37 to form a heating chamber 38.
By heating the heaters 34 and 44, the firing target aggregate 1 is heated.

The heaters 34 and 44 are connected to the tray 22.
Current-carrying members 34a, 44a extending substantially horizontally in the width direction and penetrating the left and right walls of the firing furnace body 25, and electrode portions 34b, 44b provided at both ends of the heating-current members 34a, 44a
And holders 54 and 64 for supporting the same.

As a material of the above-mentioned heating electric conductors 34a and 44a, graphite having excellent heat resistance is used.

Copper is used as a material of the electrode portions 34b and 44b, and a flow path (not shown) through which cooling water is continuously supplied is formed inside the electrode portions 34b and 44b. I have.

The holders 54 and 64 are provided on support cylinders 54 provided on the left and right walls of the chamber 24 so as to communicate with the inside of the walls.
a, 64a, annular support seats 54b, 64b fastened to the ends of the support cylinders 54a, 64a and circumferentially surrounding the electrode portions 34b, 44b, and the support seats 54b, 64
b, and seal rings 54c and 64c interposed between the electrode portions 34b and 44b.
The swinging of the electrode portions 34b and 44b about c and 64c is allowed.

In addition, in the continuous firing furnace, a pusher 35 for pushing the trays 22 one by one from the inlet side degassing chamber 23 to the preheating chamber 37, and one tray 22 from the cooling chamber 39 to the outlet side degassing chamber 26. A puller 36 that pulls out the tray 22 one by one and an intermediate puller 43 that pulls out the tray 22 one by one from the heating chamber 38 to the cooling chamber 39 are attached.

Pusher 35, puller 36, intermediate puller 4
Reference numeral 3 denotes arms 35b, 36b, 43b having support portions 35a, 36a, 43a projecting upward and capable of moving back and forth in parallel with the tray 22 transport path, and support portions 35a, 36.
a, 43a, a pin 35 extending horizontally in the width direction of the tray 22;
dock 35d pivoted via c, 36c, 43c,
36d, 43d and support portions 35a, 36a, 43a so as to regulate the rotation range of the docks 35d, 36d, 43d.
And a stopper 35e, 36e, 43e fixed to the tray 22 and disposed below the passage of the tray 22.

The docks 35d, 36d, and 43d are guided by the pressing surfaces 35f, 36f, and 43f that come into contact with the front edge of the square hole 22a formed in the same location of each tray 22, and the lower surface of the tray 22. Sliding surface 35g, 36g, 43g
When the arms 35b, 36b, and 43b are moved to the upstream side in the tray 22 transport direction, the sliding surfaces 35g, 36g, and 43g are guided on the lower surface of the tray 22 to be tilted, and then the dock 35d. , 36d, 43d are fitted into the square holes 22a.

On the contrary, the arms 35b, 36b, 43b
Is moved to the downstream side in the transport direction of the tray 22, the dock 3
5d, 36d, and 43d are rotated by their own weight in the direction in which the pressing surfaces 35f, 36f, and 43f abut against the front edge of the square hole 22a, and the stoppers 35e, 36e, and 43e cause the docks 35d, 36d, and 43d to rotate. Regulated,
The tray 2 is moved in accordance with the movement of the arms 35b, 36b, 43b.
2 is pressed toward the downstream side in the transport direction.

Further, before the operation of the continuous firing furnace is started, the pushing load of the pusher 35 when the row of the trays 22 pressed downstream in the transport direction by the operation of the pusher 35 rises in a bridge shape in the firing furnace main body 25. Is measured in advance as a pressing interruption load F0 by a load detecting means such as a load cell, and similarly, the pusher 3 when the row of the trays 22 does not withstand the pressing force and jumps up and buckles.
The indentation load of No. 5 is actually measured as a buckling generation load F1 (see FIG. 7).

When operating the continuous firing furnace, the door 2
8, 29 and the intermediate doors 41 and 42 are closed, a non-oxidizing gas is filled in the firing furnace main body 25, and the lower heater 34 and the upper heater 44 are operated to set the inside of the firing furnace main body 25 in advance. Heat to the temperature.

Next, the tray 22 on which the assembly 1 of firing objects is placed is carried into the inlet-side degassing chamber 23, the door 27 is closed, and the air in the inlet-side degassing chamber 23 is discharged to the outside. , Door 2
8, the tray 22 is pushed into the preheating chamber 37 in the firing furnace main body 25 by the pusher 35, and
Close.

After a lapse of a predetermined time, another tray 22 is moved from the inlet-side degassing chamber 23 to the preheating chamber 37 by the procedure described above.
And the tray 22 already pushed into the preheating chamber 37 by the tray 22 is pushed out toward the heating chamber 38.

When operating the pusher 35,
The pushing load of the pusher 35 is measured by load detecting means such as a load cell.

The measured value is equal to the above-described pressing interruption load F0.
, The rows of the trays 22 have risen in the firing furnace main body 25 in a bridge shape.

As described above, when the lifting of the row of the trays 22 is detected, the operation of the pusher 35 is temporarily interrupted, and the lifting of the row of the trays 22 is eliminated.
The tray 22 is pressed again by the pusher 35.

When the pushing load of the pusher 35 reaches the pushing interruption load F0 again, as shown in FIG. 7, if the above operation is repeated, the trays 22 floating in a bridge form come into contact with each other. Due to changes in various conditions such as misalignment, the tray 2
The second row advances in accordance with the pushing load of the pusher 35.

By repeating such operations, when the tray 22 has advanced to the most downstream side in the transport direction of the heating chamber 38, the intermediate door 42 is opened, and the tray 22 is moved from the heating chamber 38 to the cooling chamber 39 by the intermediate puller 43. To the middle door 4
Close 2.

After a lapse of a predetermined time, the following tray 22 is moved from the heating chamber 38 to the cooling chamber 39 by the procedure described above.
, And the tray 22 that has already been drawn into the cooling chamber 39 by the tray 22 is pushed forward.

When the tray 22 has advanced to the most downstream side in the transport direction of the cooling chamber 39, the door 29 is opened with the door 30 closed, and the tray 22 is pulled out of the cooling chamber 39 by the puller 36. After being drawn into the side deaeration chamber 26 and closing the door 29, the door 30 is opened and the tray 22 is taken out.

As a result, the firing object aggregate 1 is gradually heated in the preheating chamber 37 over a predetermined time, then heated in the heating chamber 38 for a predetermined time and cooled. It is gradually cooled in the chamber 39 over a predetermined time.

In the heating chamber 38 in the firing furnace main body 25, the radiant heat energy from the upper heater 44 is transmitted to the firing target assembly 1 from above, and the radiant heat energy from the lower heater 34 is transmitted to the gap between the free rollers 32. In addition, since the heat is transmitted from the lower side to the firing object aggregate 1 via the tray 22, the difference between the amount of heat input to the firing object aggregate 1 from above and the amount of heat input from below can be reduced. Of the target assembly 1, the firing target located below the target assembly 1 is also sufficiently heated.

In addition, since the tray 22 is supported by the rows of the plurality of free rollers 32 arranged in the width direction of the tray 22, the lower surface of the tray 22 has a small shadow portion in contact with the free roller 32. Firing object assembly 1
It is possible to improve the efficiency of transmitting radiant heat energy to the device.

Further, the lower heater 34 and the upper heater 44
Are arranged substantially horizontally and symmetrically in the width direction of the tray 22, so that the temperature distribution in the width direction of the firing target aggregate 1 becomes uniform.

As described above, in the continuous firing furnace shown in FIGS. 1 to 6, the tray 22 is moved from the heating chamber 38 to the cooling chamber 39 by the intermediate puller 43, and the intermediate door 42 is set to the closed state. Therefore, heat input to the cooling chamber 39 can be suppressed, whereby the cooling chamber 39 can be shortened and the energy efficiency of the entire furnace can be increased.

The movement of the tray 22 in the preheating chamber 37 and the heating chamber 38 is performed by a pusher 35, and the movement of the tray 22 from the heating chamber 38 to the cooling chamber 39 and the movement of the tray 22 in the cooling chamber 39 are intermediate pullers. 43
Therefore, the number of the trays 22 to be pressed by the pusher 35 is reduced, and the row of the trays 22 is less likely to be bridged.

Further, based on whether or not the pushing load of the pusher 35 has reached the pressing interruption load F0 grasped in advance, it is determined whether or not the rows of the trays 22 have been lifted, and when the pushing load has reached the pressing interruption load F0. In addition, the operation of the pusher 35 is temporarily interrupted to eliminate lifting of the row of the trays 22 and various conditions of the portion where the lifting has occurred are changed. Can be advanced.

The continuous firing furnace and the method of using the same according to the present invention are not limited to the above-described embodiment, but may be modified without departing from the scope of the present invention.

[0071]

As described above, according to the continuous firing furnace of the present invention and the method of using the same, various excellent effects as described below can be obtained.

(1) In either of the continuous firing furnaces according to the first and second aspects of the present invention and the method for using the continuous firing furnace according to the third aspect, the tray is moved from the heating chamber by an intermediate puller. Since it is drawn into the cooling chamber and the intermediate door is set to the closed state, heat input to the cooling chamber can be suppressed, and the cooling chamber can be shortened, and the energy efficiency of the entire furnace can be increased.

(2) Further, since the communication of the cooling chamber with the heating chamber is blocked by the intermediate door, even if different processing gases are used in the heating chamber and the cooling chamber, both processing gases do not mix.

(3) Further, since the tray located inside the cooling chamber is moved by the intermediate puller, the number of trays to be pushed by the pusher is reduced, so that the trays are less likely to be lifted up in the row of trays, and the trays can be securely held. Can be transported.

(4) In the continuous firing furnace according to the second aspect of the present invention, the tray is supported by a large number of free rollers disposed in the preheating chamber, the heating chamber, and the cooling chamber, so that the tray can be easily moved. be able to.

(5) In the method of using the continuous firing furnace according to the fourth aspect of the present invention, the lifting of the tray row is determined based on whether or not the pushing load of the pusher has reached the previously determined pressing interruption load. Determines the presence or absence, and furthermore, when the pushing load reaches the pressing interruption load, temporarily stops the operation of the pusher to eliminate the lifting of the tray row, and changes the conditions of the part where the lifting occurred Then, the rows of trays are advanced in accordance with the pushing load of the pusher, so that a plurality of trays can be transported reliably.

[Brief description of the drawings]

FIG. 1 is an overall vertical sectional view conceptually showing an example of an embodiment of a continuous firing furnace of the present invention.

FIG. 2 is a longitudinal sectional view conceptually showing a main part of a firing furnace main body in FIG.

FIG. 3 is a view taken in the direction of arrows III-III in FIG. 2;

FIG. 4 is a side view conceptually showing the structure of the pusher in FIG.

FIG. 5 is a side view conceptually showing the structure of the puller in FIG.

FIG. 6 is a side view conceptually showing the structure of the intermediate puller in FIG.

FIG. 7 is a graph showing a change in a pushing load of a pusher in FIG. 1;

FIG. 8 is an overall vertical sectional view conceptually showing an example of a conventional continuous firing furnace.

9 is a transverse sectional view conceptually showing a main part of a firing furnace main body in FIG.

FIG. 10 is a side view conceptually showing a state where a row of trays is lifted in a bridge shape.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Firing target aggregate 22 Tray 23 Inlet-side deaeration chamber 26 Outlet-side deaeration chamber 32 Free roller 35 Pusher 36 Puller 37 Preheating chamber 38 Heating chamber 39 Cooling chamber 42 Intermediate door 43 Intermediate puller

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F27D 21/00 F27D 21/00 Z (72) Inventor Toru Iura 1 Shinnakaharacho, Isogo-ku, Yokohama-shi, Kanagawa Prefecture Ishikawashima Harima Heavy Industries, Ltd., Yokohama No.2 Plant (72) Inventor Kazuhiko Katsumata 1 Shinnakahara-cho, Isogo-ku, Yokohama, Kanagawa, Japan Ishikawashima Harima Heavy Industries, Ltd.Yokohama Engineering Center (72) Inventor Hiroshi Machida, Kanagawa No. 1 Shin-Nakahara-cho, Isogo-ku, Yokohama Ishi Kawashima Harima Heavy Industries, Ltd. Yokohama No. 2 factory premises F-term (reference) 4K050 AA04 CA13 CF03 CF05 CF06 CF15 CF16 CG02 CG04 CG12 EA03 EA10 4K055 AA05 GA07 4K056 AA12 FA10 FA21 FA27

Claims (4)

[Claims] 1. An inlet-side degassing chamber through which a tray on which an object to be fired is placed is passed, a preheating chamber, a heating chamber, and a cooling chamber into which trays are sequentially fed from the inlet-side degassing chamber; An outlet-side degassing chamber through which the tray passing through the cooling chamber can pass; a pusher for pushing the tray from the inlet-side degassing chamber to the preheating chamber; a puller for pulling the tray from the cooling chamber to the outlet-side degassing chamber; and a heating chamber. A continuous firing furnace, comprising: an intermediate door that can be opened and closed between the cooling chamber and an intermediate puller that draws a tray from the heating chamber to the cooling chamber. 2. The continuous firing furnace according to claim 1, wherein a number of free rollers for supporting the tray from below are arranged over substantially the entire length of a preheating chamber, a heating chamber, and a cooling chamber. 3. The intermediate door is set in an open state, and the tray located at the most downstream side in the conveying direction of the heating chamber is drawn into the cooling chamber by the intermediate puller, and is located in the cooling chamber by the tray. 3. The method for using the continuous firing furnace according to claim 1, wherein the intermediate door is set to a closed state after the tray in the conveying direction is extruded downstream in the transport direction. 4. The push-in load of the pusher when the row of trays pressed by the operation of the pusher to the downstream side in the transporting direction rises in a bridge shape is grasped in advance as a pressing interruption load, and the tray in the downstream side in the transporting direction is grasped. The method according to claim 1 or 2, wherein when the pushing load of the pusher reaches the above-mentioned pushing interruption load with the pushing of the pusher, the operation of the pusher is temporarily interrupted, and then the tray is pushed again by the pusher. Use of the continuous firing furnace described.