JP2985331B2 - Batch type firing furnace - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a batch type furnace for heating and cooling an object to be fired, such as ceramics or metal, in accordance with a predetermined heat profile. A structure capable of reducing manufacturing costs and improving productivity.

[0002]

2. Description of the Related Art Generally, when an object to be fired is heated and cooled in accordance with a preset heat profile, a batch-type firing furnace as shown in FIG. 7 is conventionally used. In the baking furnace 100, a hearth 102 is disposed at an opening on the lower surface of a box-shaped furnace main body 101 including a ceiling wall 101a and a side wall 101b so as to be able to move up and down, and the hearth 102 is vertically moved by a drive motor via a lifting shaft 102a. It is configured to move in the direction. A plurality of base plates 104 supported by support pipes 105 are arranged at predetermined intervals on the upper surface of the hearth 102, and a firing target 103 is placed on each base plate 104. Further, electric heaters 106 are arranged between the objects 103 to be fired in the furnace main body 101, and a thermocouple 107 is provided in each heater 106. Further, each object 1 to be fired in the furnace body 101 is
An atmosphere gas supply pipe 108 is inserted in an upper portion of the gas supply tube 03, and an atmosphere gas discharge pipe 10 is inserted in a lower portion of each object 103.
9 has been inserted. Reference numeral 110 denotes a sealing member that seals a gap between the bottom opening of the furnace main body 101 and the hearth 102. In such a batch type firing furnace 100, the hearth 10
2 is lowered to place the objects 103 to be fired on the respective base plates 104, and the hearth 102 is raised to accommodate the objects 103 to be fired in the furnace main body 101. Then, along with a preset heat profile, the atmospheric gas is supplied to and discharged from the furnace main body 101, and the temperature is raised to and maintained at a predetermined temperature, and then cooled to perform a heat treatment.

[0003]

By the way, in recent years, there is a case where it is required to heat-treat a large number of kinds of objects to be fired in a small amount. However, when processing a small amount of an object to be fired in the above-described conventional firing furnace, since all the electric heaters must be energized to raise the temperature inside the furnace, more power is consumed than necessary. There is a problem that the manufacturing cost increases. In addition, in a conventional firing furnace, when a small amount of objects to be fired of different types are subjected to heat treatment,
Since the firing furnace must be operated repeatedly according to the heat profile for each product type, there is a problem that productivity is low.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and it is possible to save energy and reduce the production cost when heating a small amount of various kinds of objects to be fired. However, it is an object of the present invention to provide a batch-type firing furnace capable of simultaneously improving the productivity by heat treatment.

[0005]

In a batch type firing furnace according to the present invention, a plurality of regions where objects to be fired are placed in a firing furnace are formed, and heating means is provided in each of the regions. And
A heat insulating wall which can be inserted and removed in the firing furnace is provided, and the area is divided by the heat insulating wall according to a processing amount and a kind of a material to be fired, thereby forming an independent firing chamber.
It is characterized in that a temperature raising control means for controlling the temperature of the firing chamber in accordance with the unique heat profile according to the processing amount and the kind is provided. Here, as the heating means, an electric heater, a direct fire type burner, a radiation tube type burner, or the like can be adopted, and is not particularly limited.

[0006]

When a small amount of the object to be baked is heat-treated by the batch type sintering furnace of the present invention, a region corresponding to the amount of the object to be baked is selected, and this region is divided by a heat insulating wall into another region. And an independent firing chamber is provided, and only this firing chamber is controlled for temperature rise. When a small quantity of objects to be baked is heat-treated for different types, select a plurality of areas for each type and according to the processing amount. Form a chamber. The temperature of the firing chamber is controlled by a heat profile corresponding to each type. In addition, when performing normal mass production, it is not necessary to divide by a heat insulating wall, and heat treatment is performed in a state in which an object to be fired is arranged in all regions. As described above, according to the batch-type firing furnace according to the present invention, the heating means is provided in the plurality of regions formed in the firing furnace, and the heat insulating wall that can be inserted into and removed from the firing furnace is provided. As described above, an independent firing chamber is formed by dividing the region, and the temperature of the firing chamber is controlled in accordance with its own heat profile. Energy consumption can be suppressed, and manufacturing costs can be reduced accordingly. Further, the objects to be fired of different types can be simultaneously heat-treated in one firing furnace, and in this respect, the cost can be reduced and the productivity can be improved.

[0007]

An embodiment of the present invention will be described below with reference to the drawings. 1 to 3 are views for explaining a batch-type firing furnace according to an embodiment of the present invention. In the figure, 1
Is a batch-type firing furnace of the present embodiment. In the firing furnace 1, a furnace floor 3 is disposed at a lower surface opening 2c of a box-shaped furnace body 2 including a ceiling wall 2a and four side walls 2b so as to be able to move up and down. The heating furnace 1 is connected to a temperature rise control means 20. A pair of elevating shafts 4 are fixed to the lower surface of the hearth 3, and the elevating shafts 4 are rotated in forward and reverse directions by a gear connected to a drive motor, so as to be vertically moved (see the mark → in FIG. 1). It is coming and going. A gutter-shaped groove 5a is provided on the outer periphery of the lower part of the floor wall 3, and the groove 5a is provided.
The inside is filled with a sealing material such as water 5b or sand. Further, a sealing member 5c located in the groove 5a is provided at a peripheral portion of the lower surface opening 2c of the furnace main body 2, thereby sealing a gap between the furnace main body 2 and the floor wall 3.

On the upper surface of the hearth 3, five mounting portions 3 a are formed so as to protrude at predetermined intervals in the furnace width direction, and the upper surface of each mounting portion 3 a is provided on the upper surface of the hearth 3. The upper end of the support pipe 6 buried in the projection protrudes. A base plate 7 is detachably provided on the upper surface of the support pipe 6 of each of the mounting portions 3a, and the object to be fired 10 is mounted on the base plate 7. Atmospheric gas supply pipes 8 are inserted into the upper part of each mounting part 3a of the furnace main body 2, and atmospheric gas discharge pipes 9 are inserted into the lower part of each mounting part 3a of the furnace main body 2. .

Vertically parallel electric heaters H1 to H6 are arranged between both ends of the furnace main body 2 in the furnace width direction and between the mounting portions 3a, respectively. A thermocouple 11 for detecting the furnace temperature corresponding to the heater is inserted near H6. Thereby, each of the mounting portions 3a and each of the electric heaters H1 to H
6 form first to fifth region portions a to e.

Then, the second and fourth region portions b, d
A heat insulating wall 12 is removably inserted into the inside, and each side surface of the heat insulating wall 12 is in airtight contact with the ceiling wall 2a, the front and rear side walls 2b, and the mounting portion 3a. The heat insulating wall 12
A concave portion 12a surrounding the atmosphere gas supply pipe 8
Is formed on the lower end surface thereof, and a groove portion 12b is formed on the lower end surface thereof so as to engage with the upper end portion of the support pipe 6. The first, third, and fifth regions a, c, and e in the baking furnace 1 are divided by the heat insulating walls 12, and the respective regions a, c, and
e, the objects to be fired 10 of different varieties are arranged so that the objects to be fired 10 are independent of the firing chambers A,
Housed in C and E.

As shown in FIG. 2, the temperature raising control means 20 comprises three temperature raising program setting devices (DPCs) 21 and
2, 23, temperature controllers T1 to T6 for controlling on / off of the electric heaters H1 to H6, and first to fifth regions a to e.
And electromagnetic valves 24, 25, and 26 for supplying an atmospheric gas to the fuel cell. Each of the setting units 21, 22, 23 includes
As shown in FIG. 3, a unique heat profile x, y, z set according to the type of the object to be fired 10 is input, and an atmosphere gas selection pattern is input. The first setting device 21 is provided with the heat profile x
Is output to each of the temperature controllers T1 to T6, and the second setting unit 22 outputs a remote signal corresponding to the profile y to the temperature controllers T2 to T6.
The setting unit 23 is configured to output a remote signal according to the profile z to the temperature controllers T5 and T6.

The first setting unit 21 controls the opening and closing of the air, N ₂ , and O ₂ solenoid valves 27 and controls the opening and closing of the atmosphere gas supply solenoid valve 24 in accordance with the atmosphere gas selection pattern. The gas is supplied to the first to fifth regions a to e. The second setting device 22 is provided for each solenoid valve 2.
8, and the supply electromagnetic valve 25 is controlled to open and close, and the atmosphere gas is supplied to the second to fifth region parts be, and
The setter 23 controls the opening and closing of each of the solenoid valves 29 and the supply solenoid valve 26, and sets the atmosphere gas to the fourth and fifth regions d,
e.

Further, each of the temperature controllers T1 to T6 inputs the detected temperature in the furnace from each thermocouple 11, and controls each of the thyristors S1 to S6 so that the detected temperature follows the above heat profiles x, y and z. The electric heaters H <b> 1 to H <b> 6 are controlled to be turned on and off via the electric heaters. The temperature controllers T2 to T6 are respectively connected to the temperature raising program setting units 21 and 21.
Relay switches R1 to R5 for switching remote signals from the switches 2 and 23 are connected.

Next, the operation and effect of this embodiment will be described. In the batch type firing furnace 1 of the present embodiment, when simultaneously heating a small amount of three objects 10 of different types in a small amount, as shown in FIG. Then, the base plate 7 of the fourth region portions b and d is removed, and the heat insulating wall 12 is formed on the mounting portion 3a.
And is positioned so as to engage with. The object 10 to be fired is placed on the base plate 7 of the first, third, and fifth regions a, c, and e. Then, the furnace hearth 3 is raised by the drive motor, and the object 10 to be fired is accommodated in the furnace body 2. As a result, the respective areas a, c, and e in which the object to be fired 10 is housed are independent firing chambers A, C, and E. In this state, the temperature rise control means 20 is started. Then, each of the temperature raising program setting units 21, 22, and 23 supplies the selected atmosphere gas to each of the firing chambers A, C, and E, and sets each of the firing chambers A, C, and E to a heat profile x, y, and Then, when the temperature in each of the firing chambers A, C, and E reaches 900 ° C., the motor is driven to lower the hearth 3. Thereby, the three types of objects to be fired 10 can be simultaneously heat-treated in one firing furnace.

FIG. 4 shows a case where the objects to be fired 10 having different processing amounts and types are simultaneously heat-treated. In this case, the heat insulating wall 12 is fitted and positioned on the mounting portion 3a of the second region portion b, and a small amount of the object 10 to be fired is mounted on the first region portion a, and the third to fifth portions are placed. The objects 10 to be fired are placed in the regions c to e, respectively, and divided into firing chambers A and firing chambers CE. By operating the temperature raising program setting units 21 and 22, the temperature of the firing chamber A is raised along the heat profile x, and the temperature of the firing chambers C to E is raised along the heat profile y. The object to be fired 10 can be simultaneously heat-treated in one firing furnace.

FIG. 5 shows a case where a small amount of the object to be fired 10 is heat-treated. In this case, the mounting portion 3a of the third region c
The heat insulating wall 12 is fitted thereon, and the first and second regions a and b are used as the firing chambers A and B. Then, in this case, the temperature rise program setting unit 21 energizes only the electric heaters H1 to H3, thereby performing the heat treatment with energy saving.

As described above, according to this embodiment, the first to fifth regions a to e are formed in the baking furnace 1, and the electric heaters H1 to H6 are disposed in the respective regions a to e. A heat insulating wall 12 is detachably provided in each of the regions a to e to form arbitrary independent firing chambers A to E, and each of the firing chambers A to E corresponds to a type of the object 10 to be fired. Heat profile x, y,
Since the temperature is increased along z, unnecessary power consumption can be avoided, and the manufacturing cost can be reduced accordingly. By the way, as shown in FIG. 5, two firing chambers A and B
Is used, and firing is performed by three circuits of the electric heaters H1 to H3, the amount of power consumption can be reduced by about 40% as compared with the case where power is supplied to all conventional heaters. In addition, the objects to be fired 10 of different types can be simultaneously heat-treated in one firing furnace 1, so that the cost can be reduced and the productivity can be improved.

FIG. 6 shows another example of the above-described embodiment, in which a floor 3b is formed by cutting off the hearth 3 corresponding to each of the regions a to e, and a lifting shaft 4 is attached to each floor 3b. This is an example in which each floor 3b can be independently raised and lowered by connecting. In the case of such a configuration, each of the firing chambers A, C, and E can be controlled at an arbitrary timing, continuous operation can be performed, and productivity can be further improved.

[0019]

As described above, according to the batch-type sintering furnace of the present invention, the heating means is arranged in a plurality of regions formed in the sintering furnace and can be inserted into and removed from the sintering furnace. A heat insulating wall is provided, and the above-mentioned area is divided by the heat insulating wall to form an independent firing chamber, and the temperature of the firing chamber is controlled according to its own heat profile. In the case of coping with production, the production cost can be reduced and the productivity can be improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a batch-type firing furnace according to an embodiment of the present invention.

FIG. 2 is a control system diagram for explaining a temperature rise control unit of the embodiment.

FIG. 3 is a characteristic diagram showing a heat profile according to objects to be fired of different varieties in the embodiment.

FIG. 4 is a cross-sectional view showing an example of use in a case where a processing amount and a kind are different in the firing furnace of the embodiment.

FIG. 5 is a sectional view showing an example of use of the above embodiment when the processing amount is small.

FIG. 6 is a sectional view showing another example of the above embodiment.

FIG. 7 is a sectional view showing a conventional firing furnace.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Batch-type baking furnace 10 Object to be baked 12 Insulated wall 20 Heating control means H1-H6 Electric heater (heating means) a-e Area part A-E Baking chamber x, y, z Heat profile

Claims (1)

(57) [Claims] 1. A plurality of regions on which an object to be fired is placed are formed in a firing furnace, and a heating means is provided in each of the regions, and a heat insulating wall which can be inserted into and removed from the furnace is provided. The heat insulating wall is provided to divide the above-mentioned area according to the processing amount and the type of the object to be fired, thereby forming an independent firing chamber. A batch-type baking furnace provided with a temperature-raising control means for controlling the temperature in accordance with the heat profile.