JPH06117763A - Hearth elevating electric furnace - Google Patents

Abstract

PURPOSE:To simplify an elevating mechanism by a method wherein a lifting mechanism is provided at the lower position of a baking chamber, receiving ceramics products from the lower part thereof and whose hearth can be opened, while a putting table is provided on the upper surface of a track, used both for the hearth, elevated by the lifting mechanism and contacted closely with the lower part of the baking chamber so as to be connected thereto, through a supporting table. CONSTITUTION:A plurality of upper and lower fore-and-aft direction heaters and left-and-right direction heaters 17 are provided near the inner wall surface of a baking chamber 15, receiving a dome type ceramic product 4 from the lower part thereof to bake it and whose hearth can be opened, while a lifting mechanism 7 is provided at the lower position of the baking chamber 15. A putting table 27 is provided on a truck, used both for a hearth 5, shifted onto a lifting mechanism 7 while running on a floor 2 and descending and elevated by the lifting mechanism 7 so as to be contacted closely with the lower part of the baking chamber 15 so as to be connected thereto, through a supporting table 26. The putting table 27 is provided with upper and lower penetrating holes 28 communicated with the inner part of the ceramic product 4. The lifting mechanism 7 is fixed to the lower part of an electric furnace 1 and the truck, used both for the hearth 5, is runable, whereby inconvenience due to the running of the lifting mechanism can be eliminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bottom-floating electric furnace.

[0002]

2. Description of the Related Art A conventionally known Japanese Utility Model Publication No. 1-116394 discloses a firing chamber in which a ceramic product can be housed and fired.
A plurality of vertical heaters provided in the vicinity of the inner wall surface of the firing chamber, a truck running on a rail provided in the lower part of the electric furnace, a lift mechanism mounted on the truck, and lifted by the lift mechanism. The bottom of the furnace is provided with a mounting table formed of a perforated plate on the bottom of the furnace via a supporting table, a small ceramic product is placed on the mounting table, and the gas supplied from the gas supply pipe is supplied to the perforated plate. A bottom-bottom elevating electric furnace that is circulated through a mounting table is described. The known example facilitates the supply of a ceramic product, which is a heat target, into the firing chamber, and prevents the uneven firing by circulating a gas.

[0003]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
In the one described in Japanese Patent No. 116394, only three upper and lower front-back heaters are provided near the inner wall of the firing chamber, and no left-right heaters are provided. Therefore, when firing a cylindrical ceramic product, Is not suitable because it results in mottled firing. Further, since the lift mechanism is mounted on the moving carriage, there is an inconvenience that the lift mechanism must also travel.

[0004]

Therefore, according to the present invention, the dome-shaped ceramic product 4 is housed from below and can be fired, and the firing chamber 15 is open at the bottom of the furnace, and the upper and lower portions are provided near the inner wall surface of the firing chamber 15. A plurality of front and rear heaters 16 and left and right heaters 17, a lift mechanism 7 provided at a lower position of the baking chamber 15, and a lift mechanism 7 that travels down the floor 2 and descends. And a furnace bottom 5 that is brought into contact with the lower part of the firing chamber 15 and is closely joined to the bottom of the baking chamber 15. A mounting table 27 is provided on the upper surface of the furnace bottom 5 via a supporting table 26, and the dome is mounted on the mounting table 27. Type ceramic products 4
And a bottom 27 is provided, and a vertical bottom through hole 28 communicating with the inside of the ceramic product is provided on the mounting table 27 to provide a furnace bottom elevating type electric furnace. Further, according to the present invention, in the electric furnace, a horizontal front-back heater 16 and a horizontal heater 17 are provided near the inner wall of the firing chamber 15, and carbonization is provided inside the front-back heater 16 and the left-right heater 17. The furnace bottom elevating electric furnace is provided with front and rear strips 18 and left and right strips 19 of a silicon-based refractory.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the electric furnace of the present invention will be described. Reference numeral 1 is an electric furnace, which is mounted on an upper part of an underframe 3 provided on a floor 2 as shown in FIG. The underframe 3 is used
This is because the dome-shaped ceramic product 4 that is large enough for a human to fit in is carried laterally by the carriage and hearth 5 and supplied into the electric furnace 1 from below. It has a shape having desk-like legs 6 so that a dolly / furnace bottom 5 can enter from the side, and has a lift mechanism 7 inside.

Reference numeral 8 is a cylinder of the lift mechanism 7, and when the cylinder 8 expands and contracts, the lift mechanism 7 moves up and down between the position of the temporary line and the position of the solid line, and moves up and down the carriage / furnace bottom 5 that has been transferred. At the center of the platform surface 9 of the underframe 3, a vertically extending entrance 10 is provided, and the lower end 11 of the electric furnace 1 is attached in close contact with the upper surface of the entrance 10. The doorway 10 is continuous to the lower end 11.

The outer wall of the electric furnace 1 of the embodiment is surrounded by an outer iron plate 12, a ceramic fiber layer 13 is formed inside the outer iron plate 12, and a ceramic board layer 14 is formed inside the ceramic fiber layer 13. The inside of the ceramic board layer 14 is a firing chamber 15, and in the firing chamber 15, the front-back heater 16 and the left-right heater 1 are placed in a state of history.
7 are provided (FIG. 3). The front-rear direction heater 16 and the left-right direction heater 17 are horizontally provided in the vicinity of the ceramic board layer 14, and are arranged in a plurality at a predetermined interval in the vertical direction (12 in the drawing). .

Inside the front-rear heater 16 and the left-right heater 17, in order to prevent heat from the front-rear heater 16 and the left-right heater 17 from being directly applied to the dome-shaped ceramic product 4, a silicon carbide material is used. The front and rear belt-shaped plates 18 and the left and right belt-shaped plates 19 are provided to form the front and rear belt-shaped plates 18.
The dome-shaped ceramic product 4 is fired by radiant heat via the left and right strip-shaped plates 19.

In the present invention, the horizontal heat-resistant partition steel 20 is provided in order to divide the firing chamber 15 into a plurality of sections in the vertical direction. The horizontal heat-resistant partition steel 20 has its outer end fixed to the inner surface of the outer iron plate 12, and its inner end 21 has the front and rear strips 1 described above.
The horizontal heat-resistant partition steel 20 forms an upper zone 22, a middle zone 23, and a lower zone 24 by projecting between 8 and the left and right strips 19 into the firing chamber 15.

The front and rear heaters 16 and the left and right heaters 17 in the upper zone 24, the middle zone 23 and the lower zone 24 are respectively connected to an automatic control mechanism 25 to eliminate the concentration of hot air on the upper side and to reduce the temperature difference between the upper and lower sides. ± 15 at maximum
To ℃.

The trolley / furnace bottom 5 is an inverter-controlled motor drive system with a speed reducer, is remote-controlled, has a soft start / soft stop mechanism, and has a variable speed. The lift mechanism 7 includes two cylinders 8.
This is used and comes with a safety stopper. The automatic control mechanism 25 uses a digital program setting device, a temperature controller of a digital support controller, and an SCR power controller so that smooth temperature control can be performed, and a digital temperature controller for monitoring the heater temperature. Is set to suppress partial high temperature.

On the upper surface of the carriage / furnace bottom 5,
At least the front-back heater 16 and the left-right heater 1
A mounting table 27 is provided via a supporting table 26 so as to be higher than the lower one of the table 7, and the dome-shaped ceramic product 4 is placed on the mounting table 27. The mounting table 27 is provided with a desired number of vertical through holes 28 so that hot air is supplied to the inside of the dome-shaped ceramic product 4.

[0013]

[Operation] Next, the operation will be described. The large dome-shaped ceramic product 4 as described above is placed on the placing table 27 placed on the trolley-cum-furnace bottom 5 via the supporting table 26, and the soft start is performed so as not to fall, and the phantom line in FIG. As shown in FIG. Then, when the cylinder 8 is operated, the lift mechanism 7 is lifted as shown by the solid line, and the dome-shaped ceramic product 4 is stored in the firing chamber 15 of the electric furnace 1 from the doorway 10 of the table surface 9 of the underframe 3 and the firing chamber 15 The dolly / furnace bottom 5 is closely attached to the lower end of the. In this state, when the front and rear heaters 16 and the left and right heaters 17 in the upper zone 24, the middle zone 23, and the lower zone 24 are energized, the dome-shaped ceramic product 4 becomes the front and rear heaters 16 and the left and right heaters 17.
And the inside of the dome-shaped ceramic product 4 is uniformly burned by the hot air passing through the vertical through holes 28.

[0014]

According to the conventional known Japanese Utility Model Laid-Open No. 1-116394, only three heaters in the front-back direction are provided in the firing chamber, and no heaters in the left-right direction are provided. It is not suitable for firing ceramic products in the shape of a circle. Further, since the lift mechanism is attached to the truck and the furnace bottom, there is an inconvenience that the lift mechanism also has to travel. However, according to the present invention, the dome-shaped ceramic product 4 is housed from below and can be fired, and the firing chamber 15 is open at the bottom of the furnace, and the front and rear heaters 16 are provided in the vicinity of the inner wall surface of the firing chamber 15. Horizontal heater 17
And a lift mechanism 7 provided at a lower position of the firing chamber 15.
Then, the vehicle moves to the lift mechanism 7 which is traveling down the floor 2 and is moved up by the lift mechanism 7 to move to the firing chamber 15
Of the dome-shaped ceramic product 4 is mounted on the upper surface of the furnace bottom 5 via a support table 26. The dome-shaped ceramic product 4 is mounted on the mounting table 27. ,
The above-mentioned mounting table 27 is a furnace bottom elevating electric furnace in which vertical through holes 28 communicating with the inside of the ceramic product are provided. Therefore, unlike the known example in which the lift mechanism travels with the carriage, the lift mechanism 7 Is fixed at a lower position of the electric furnace 1 and only the carriage / furnace bottom 5 travels, so that various inconveniences caused by traveling the lift mechanism 7 are released, and the dome-shaped ceramic product 4 is also transported. It's easy.

Further, according to the present invention, in the electric furnace, a horizontal front-back heater 16 is provided near the inner wall of the firing chamber 15.
And a left-right heater 17, and the front-back heater 16
Since the furnace bottom elevating electric furnace is provided with the front and rear strips 18 and the left and right strips 19 of the silicon carbide refractory inside the horizontal heater 17, the firing is performed by radiant heat. Can be prevented.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of the present invention.

FIG. 2 is a partially enlarged vertical side view of the present invention.

FIG. 3 is a cross-sectional plan view of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Electric furnace, 2 ... Floor, 3 ... Underframe, 4 ... Dome-shaped ceramic product, 5 ... Carriage and furnace bottom, 6 ... Legs, 7 ... Lift mechanism, 8
... Cylinder, 9 ... Platform surface, 10 ... Doorway, 11 ... Bottom end, 1
2 ... Outer iron plate, 13 ... Ceramic fiber layer, 14 ...
Ceramic board layer, 15 ... Firing chamber, 16 ... Front-back heater, 17 ... Left-right heater, 18 ... Front-back strip plate, 19
… Left and right band plates, 20… Horizontal heat-resistant partition steel, 21… Inner end, 2
2 ... upper zone, 23 ... middle zone, 24 ... lower zone, 25 ... automatic control mechanism, 26 ... support base, 27 ... mounting base, 28 ... vertical through hole.

Claims (2)

[Claims] 1. A firing chamber 15 having an open furnace bottom capable of accommodating and firing a dome-shaped ceramic product 4 from below, and the firing chamber 1.
5, a plurality of front and rear heaters 16 and a plurality of left and right heaters 17 provided in the vicinity of the inner wall surface, a lift mechanism 7 provided at a lower position of the firing chamber 15, and a floor 2 which travels and descends. Transfer to the lift mechanism 7 and the lift mechanism 7
And a furnace bottom 5 that is brought into contact with the lower part of the firing chamber 15 and is closely joined to the bottom of the baking chamber 15. A mounting table 27 is provided on the upper surface of the furnace bottom 5 via a supporting table 26, and the dome is mounted on the mounting table 27. An electric furnace for raising and lowering the bottom of the furnace, in which the type ceramic product 4 is placed, and the placing table 27 is provided with vertical through holes 28 communicating with the inside of the ceramic product. 2. The horizontal heater 16 and a horizontal heater 17 are provided in the vicinity of the inner wall of the firing chamber 15, and silicon carbide is provided inside the front heater 16 and the horizontal heater 17, respectively. Furnace bottom lift type electric furnace provided with front and rear strips 18 and left and right strips 19 of high quality refractory.