KR100762011B1 - Exhaust pipe for rotary type sintering furnace - Google Patents

Abstract

An exhaust device for a rotary sintering furnace is provided to improve exhaust efficiency in the cylindrical furnace body by mounting double exhaust pipes on an upper central part of a cylindrical furnace body mounted on the rotary sintering furnace, wherein the double exhaust pipes are assembled with each other in such a way that a plurality of vent holes formed in outer peripheral surfaces of the double exhaust pipes intersect with each other. In a rotary sintering furnace comprising: a furnace body of which an upper part is covered with a disc type cover, and in which an insulating material embedded; a rotary support including a setter having a plurality of ceramic formed bodies vertically stacked on an upper part thereof; and a liftable and lowerable means vertically transferring the rotary support in a supporting frame, an exhaust device for the rotary sintering furnace comprises an exhaust pipe(200) which is penetratingly connected to a central part of the disc type cover and includes a first exhaust pipe(210) and a second exhaust pipe(220) having a plurality of through holes(211,221) formed in outer peripheral surfaces thereof, the second exhaust pipe being inserted into the first exhaust pipe such that the plurality of through holes are overlapped with each other. The first exhaust pipe has reciprocally symmetrical locking ports(213) and locking moving ports(214) formed in an upper outlet(212). The second exhaust pipe locking projections formed at positions adjacent to an upper outlet(222) on an outer peripheral surface thereof such that the locking projections are inserted into the locking moving ports through the locking ports.

Description

Exhaust pipe for rotary type sintering furnace

1 is a perspective view of a conventional firing furnace.

2 is a cross-sectional view of a conventional kiln.

Figure 4 is an assembled perspective view of the exhaust vent mounted on the rotary kiln according to the present invention.

Figure 5 is a perspective view of the combination of the exhaust vent mounted on the rotary kiln according to the present invention.

Figure 6 is a cross-sectional view of the exhaust vent mounted on the rotary kiln according to the present invention.

7 is a cross-sectional view of a rotary kiln to which the exhaust structure of the present invention is applied.

<Explanation of symbols for main parts of the drawings>

100. Firing Furnace 200. Vent

210. First exhaust pipe 220. Second exhaust pipe

211,221. Via 213. Hanger

214. Hanging hole 223. Hanging projection

O. Superimposed through hole C. Ceramic fired body

The present invention relates to an exhaust port mounted in a rotary kiln, and more particularly, a double exhaust pipe coupled to cross a plurality of exhaust holes in the upper center of a cylindrical furnace main body mounted on the rotary kiln, and is arranged in the cylindrical furnace main body. It is related with the exhaust port of the rotary kiln which can improve exhaust efficiency.

In general, ceramic electronic products, such as multilayer ceramic capacitors, ferrites, piezoelectric materials, etc., are formed of a ceramic raw material into a predetermined shape and manufactured into a molded body, and then the multilayer ceramic molded body is manufactured through a binder removal process, a firing process, and a cooling process in a kiln. Is done.

In the process of manufacturing such a ceramic molded body, a binder is added to a raw material powder such as BaTiO ₃ , CaCa ₃ , MnO, Glass Frit, etc. to prepare a slurry, and a ceramic sheet is formed in which the slurry is used as a dielectric sheet. The laminated sheet is manufactured by laminating the internal electrodes, which are metal components of Ni, Cu, Pd, and Pd / Ag materials, on the surface of the ceramic sheet by laminating multiple layers of the ceramic sheets on which the internal electrodes are printed. After pressing at a pressure of 500 to 1300 kgf / cm 2, a ceramic molded body is produced by cutting the compressed laminated sheet to a predetermined length.

In addition, the ceramic molded body is baked in a baking furnace at a temperature of 230 ~ 350 ℃ (bake-out) to remove the binder component, a firing process for baking for 10 to 24 hours at a temperature of 900 ~ 1300 ℃, and After the completion of the firing, the cooling step of cooling to a low temperature is continuously performed, and the ceramic molded body fired in the firing furnace is finished with a ceramic product by plating by applying external electrodes and terminal electrodes on the outer circumferential surface thereof.

In order to control the quality characteristics of the ceramic products manufactured by such a process, a rotary kiln has been mainly used recently. As a result, the binder, which is an organic component in the furnace, is effectively discharged. Exhaust structures for preventing delamination or crack defects that may be caused by) have emerged as important process variables for controlling the quality characteristics of ceramic moldings.

A conventional exhaust structure of a rotary kiln, which is one means for controlling process variables in the rotary kiln, will be briefly described based on FIGS. 1 and 2 as shown below.

1 is a perspective view of a conventional kiln, Figure 2 is a cross-sectional view of a conventional kiln, as shown in the conventional rotary kiln 10 is a cylindrical furnace body 20 supported by a support frame 11, the furnace body ( It is composed of a rotary support 30 which is incorporated in the lower portion of 20) and a plurality of ceramic moldings (C) are stacked on the upper surface, and the lifting means 40 for vertically conveying the rotary support (30).

The furnace main body 20 has a cylindrical shape and a heat-insulating material 21 built into a refractory is embedded therein, and a disc-shaped cover 22 is covered on the upper portion of the heat-insulating material 21 to maintain the inside thereof in a vacuum state. It consists of a chamber-type furnace that can be made.

In addition, in the furnace body 20, a plurality of heating elements 23 are disposed in a structure for evenly raising the temperature of the upper and lower portions of the heat insulating material 21 in order to increase the internal temperature thereof. The power supply terminal for heat generation is fixedly coupled in the form of penetrating the wall of the heat insulating material (21).

At this time, the furnace main body 20 has an exhaust port 50 in the upper center so that the excess gas component ejected from the interior of the ceramic fired body (C) during the firing process by the atmosphere gas supplied therein can be discharged to the outside. Is mounted.

The conventional exhaust port 50 mounted on the disc-shaped cover 22 in the furnace body 20 is a cylindrical centralized exhaust pipe 50 mainly composed of a single body, as shown in FIG. The double exhaust pipe 51 of the state in which the exhaust pipes overlap is mainly used.

In the conventional exhaust port 50, since the suction hole 52 and the exhaust hole 53 are formed only on the lower portion of the cylindrical body 51, the exhaust gas of the furnace body 20 is chamber-type heat insulating material 21. By discharging to the upper exhaust hole 53 only through the lower suction hole 52 located in the), the binder or impurities inside the furnace body 20 is not easily discharged, causing a variation in the distribution of atmospheric gas in the furnace. This is being pointed out.

In addition, the disc-shaped cover is attached to the lower surface of the disc-shaped cover 22 which is covered on the upper portion of the heat insulator 21 of the furnace body 20 by attaching a relatively high temperature binder or impurity that is not discharged through the exhaust port 50. (22) There is a disadvantage in that dew condensation occurs due to the temperature difference between the upper and lower surfaces.

Accordingly, the present invention was devised to solve the above-mentioned disadvantages and problems raised in the exhaust port of a conventional kiln, and a pair of exhaust pipes having a plurality of through holes formed on an outer circumferential surface thereof are coupled to cross each other to form the cylindrical furnace body. An object of the present invention is to provide an exhaust port of a rotary kiln, through which a plurality of through-holes provide effective exhaust of atmospheric gas and binder through a plurality of through holes. have.

The object of the present invention is supported by a support frame, a furnace body having a plurality of heating elements provided therein, a rotary support provided with a plurality of setters that are tightly coupled to the lower portion of the furnace body and rotated on an upper surface separately; In the rotary kiln consisting of a lifting means for vertically conveying the rotary support in the support frame, a pair of cylindrical exhaust pipe having a plurality of through holes on the outer circumferential surface is coupled to the exhaust port of the furnace so that the through holes overlap each other It is achieved by the exhaust port of the rotary kiln, which is penetrated through the central portion of the disc-shaped cover seated on the upper part of the main body.

The furnace body is formed in a cylindrical shape is a heat insulating material consisting of a polygonal or circular refractory inside, a plurality of heating elements are coupled through the side wall of the heat insulating material, the outer peripheral surface of the same shape as the outer peripheral surface on the upper end of the heat insulating material The plate-like cover is tightly coupled to form a chamber-type vacuum furnace body.

In addition, the furnace main body is vertically transported by the lifting means is integrated by the lifting base is laminated with a plurality of ceramic molded body to the upper portion of the lower portion of the heat insulating material in a state supported by the support frame at a predetermined height from the ground, and the Rotating base is rotated in the forward or reverse direction by a separate drive means.

The setter provided in the upper portion of the rotary support is rotated in a direction opposite to the direction of rotation of the rotary support is a plurality of ceramic molded body is vertically stacked on the upper surface.

That is, the flow of the atmosphere gas injected into the furnace main body by the rotation of the setter in which a plurality of ceramic molded bodies are stacked in the lower part of the furnace main body and the rotation support in which the setters are arranged at equal intervals is induced by the rotation of the ceramic molded body. This makes the distribution of the atmosphere gas in the furnace main body uniform.

On the other hand, the atmosphere gas circulated in the furnace body and the firing of the ceramic molded body by the temperature rising through the heating element is discharged to the outside by an exhaust port penetrated through the central portion of the disk-shaped cover covered in the upper portion of the furnace body. Bar, the exhaust port is provided with a plurality of through-holes on the outer circumferential surface is formed as a pair of exhaust pipes having different diameters, and coupled to overlap the through-holes of the respective exhaust pipes to form overlapping through-holes of different sizes formed in the exhaust openings There is a technical feature in that the atmosphere gas containing the organic impurities in the furnace body is sucked and discharged through the upper exhaust hole.

Matters relating to the operational effects including the technical configuration of the rotary kiln exhaust port according to the present invention will be clearly understood by the following detailed description with reference to the drawings in which preferred embodiments of the present invention are shown.

First, Figure 4 is an assembled perspective view of the exhaust outlet mounted to the rotary kiln according to the present invention, Figure 5 is a combined perspective view of the exhaust outlet mounted to the rotary kiln according to the present invention, Figure 6 is mounted to the rotary kiln according to the present invention It is sectional drawing of an exhaust port, and FIG. 7 is sectional drawing of the rotary kiln to which the exhaust structure of this invention was applied.

Hereinafter, the same code | symbol is attached | subjected about the structure same as the technical structure with respect to the conventional rotary kiln 10. As shown in FIG.

As shown, the rotary kiln 100 according to the present invention is a furnace main body 20 in which the heat insulating material 21 and the disk-shaped cover 22 which is covered on the upper part of the cylindrical furnace 24 is in close contact with the inner wall surface of the cylindrical furnace 24. And, the rotary base 30 is tightly coupled to the lower portion of the furnace body 20 by the vertical lifting movement, and the atmosphere gas filled in the heat insulating material 21 is coupled through the central portion of the disc-shaped cover 22 to the outside The exhaust port 200 is discharged to.

The heat insulating material 21 has a wall made of alumina-based ceramic fiber board, and the bottom body is made of a refractory heat insulating material of mullite refractory material, and a plurality of heat generating elements 23 are coupled through the wall of the heat insulating material 21 so as to form a circle. The inside of the chamber-type heat insulating material 21 sealed by heating the plate-shaped cover 22 is heated up to the temperature of 900-1300 degreeC by the heating of the heat generating body 23. As shown in FIG.

In addition, a plurality of ceramic moldings (C) vertically stacked on the upper portion of the rotary support 30, which is rotatably coupled to the lower portion of the thermal insulation material 21, is embedded in the insulation material 21. Is supported on the upper surface of the plurality of setters 31 which are individually rotated on the rotary pedestal 30 so that the smooth furnace of the atmosphere gas injected into the furnace body 20 due to the separate rotation of the rotary pedestal 30 and the setter 31 is supported. Will induce my flow.

Accordingly, the ceramic molded body C is fired by the elevated temperature of the atmosphere gas in the furnace due to the heating of the heating element 23 in the chamber-type sealed heat insulating material 21, and is involved in the firing of the ceramic molded body C. The atmosphere gas is discharged to the outside through the exhaust port 200 penetrated through the central portion of the disc-shaped cover 22 together with the binder and other impurities including the organic material generated during the firing.

Here, the exhaust port 200 is composed of a pair of first exhaust pipe 210 and the second exhaust pipe 220 having different diameters, each exhaust pipe 210, 220 is a plurality of through-holes 211 on the outer peripheral surface ) 221 is formed, and the second exhaust pipe 220 is inserted into the first exhaust pipe 210 so that the plurality of through holes 211 and 221 overlap each other.

The plurality of through-holes 211 and 221 formed in the first exhaust pipe 210 and the second exhaust pipe 220 are arranged in a spiral along its outer circumferential surface, wherein the first exhaust pipe 210 and the second exhaust pipe 220 are formed. It is preferable that the helix angles of the through holes 211 and 221 formed in) are formed to have different angles.

The reason for varying the helix angle of the through holes 211 and 221 formed in the first exhaust pipe 210 and the second exhaust pipe 220 is to rotate the second exhaust pipe 220 inserted into the first exhaust pipe 210. This is to control the overlap between the through-holes 211 and 221, and more detailed reasons will be described later.

In addition, the exhaust port 200 is integrally formed by the close coupling of the first exhaust pipe 210 and the second exhaust pipe 220 as shown in Figure 5, the first exhaust pipe 210 is the upper outlet 212 portion Interlocking symmetry 213 and the engaging flow port 214 is formed in the, the second exhaust pipe 220 is a locking projection 223 is inserted through the locking hole 213 in a position adjacent to the upper outlet 222. ) Is projected on the outer circumferential surface thereof.

In the exhaust port 200, the second exhaust pipe 220 is inserted into the first exhaust pipe 210 so that the locking protrusion 223 of the second exhaust pipe 220 is locked to the first exhaust pipe 210. The second exhaust pipe 220 is rotated within a predetermined range in the first exhaust pipe 210 by being inserted through the 213 and coupled to the locking flow port 214 so as to be transported left and right.

Therefore, the second number of the overlapping through holes O due to the overlap of the through holes 211 and 221 provided in the first exhaust pipe 210 and the second exhaust pipe 220, respectively, is used by the locking protrusion 223. It can be adjusted by the rotation of the exhaust pipe (220).

The exhaust port 200 having such a structure is penetrated through the central portion of the disc-shaped cover 22 covered by the upper end of the heat insulating material 21 embedded in the furnace body 20 as shown in FIG. Firing is applied to the ceramic molded body (C) rotated in the) to discharge the atmosphere gas containing the impurities and the binder.

Discharge of the atmosphere gas filled in the sealed chamber-type heat insulating material 21 is the lower inlet 215, 225 of the first exhaust pipe 210 and the second exhaust pipe 220 constituting the exhaust port 200. Atmospheric gas in the furnace is sucked through the outer circumferential surface through holes 211 and 221, and the sucked gas is discharged to the outside through the discharge holes 212 and 222 of the upper end.

Here, the atmosphere gas in the furnace sucked through the overlapping through-holes (O) by adjusting the number of overlapping through-holes (211, 221) by mutual rotation of the first exhaust pipe 210 and the second exhaust pipe (220). By adjusting the amount, there is a technical feature in that the atmosphere gas emissions in the furnace body 20 can be adjusted.

Preferred embodiments of the present invention described above are disclosed for the purpose of illustration, and various substitutions, modifications, and changes within the scope without departing from the spirit of the present invention for those skilled in the art to which the present invention pertains. It will be possible, but such substitutions, changes and the like should be regarded as belonging to the following claims.

As described above, the exhaust port of the rotary kiln of the present invention is the central portion of the disk cover cover the exhaust port coupled to the plurality of through-holes formed on the outer circumferential surface of the pair of exhaust pipes are covered in the upper portion of the heat insulating material embedded in the cylindrical furnace body By penetrating through, there is an advantage of improving the exhaust efficiency of the atmosphere gas containing impurities in the furnace body.

In addition, the present invention by rotating the second exhaust pipe in the first exhaust pipe to adjust the overlap of the through-holes formed on the outer peripheral surface of each exhaust pipe, by adjusting the amount of atmospheric gas intake in the furnace body, the amount of atmospheric gas through the exhaust port of the exhaust opening This produces an effect that can be easily adjusted.

Claims (8)

A furnace body supported by a support frame and having a heat insulating material interposed therebetween with a plurality of heating elements penetrated therein to cover a disc-shaped cover thereon; A rotary base rotatably coupled to the lower part of the furnace body, the rotary base having a setter in which a plurality of ceramic moldings are vertically stacked and individually installed on the upper part; And In the rotary kiln consisting of the lifting means for vertically conveying the rotary support in the support frame, The outer periphery of the pair of first exhaust pipe and the second exhaust pipe which are penetratingly coupled to the central portion of the disc-shaped cover and formed in a cylindrical shape having different diameters and having a plurality of through holes arranged in a spiral shape at different angles on the outer peripheral surface thereof. An exhaust port tightly coupled; Exhaust port of the rotary kiln comprising a. The method of claim 1, The exhaust port, the exhaust port of the rotary kiln, characterized in that the second exhaust pipe is inserted into the first exhaust pipe. delete The method according to claim 1 or 2, The first exhaust pipe and the second exhaust pipe, the exhaust port of the rotary kiln, characterized in that the upper inlet, the lower inlet and the upper outlet are formed respectively. delete The method of claim 2, The first exhaust pipe, the exhaust port of the rotary kiln, characterized in that the upper and the outlet port portion of the symmetrical locking port and the locking flow port is formed. The method of claim 2, The second exhaust pipe, the exhaust port of the rotary kiln, characterized in that the engaging projection is formed in a position adjacent to the upper outlet. The method according to claim 6 or 7, The first exhaust pipe and the second exhaust pipe, the exhaust port of the rotary kiln, characterized in that the locking projection is mounted so that the left and right flow in the locking flow opening through the locking opening.

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