KR102206640B1 - R0ller conveyer apparatus f0r sinterring furnace of ceramic electronic-parts - Google Patents

Abstract

The present invention relates to a roller conveyor device in a sintering furnace for ceramic electronic components, which comprises: a plurality of transfer rolls for transferring molded objects of the ceramic electronic components; shaft bearings installed on both side ends of each transfer roll; and a shaft frame in which a plurality of shaft bearing insertion holes are arranged and formed, wherein each of the shaft bearing insertion holes of the shaft frame has a cooling gas inflow hole. Each of the cooling gas inflow holes is configured to communicate with a cooling gas conduit through which cooling gas flows. Thus, the roller conveyor device allows the cooling gas to be sprayed to the shaft bearings of each of the transfer rolls to prevent bearing lubricating oil from being stiffened although high temperature in the sintering furnace is transmitted to the shaft bearings of the transfer rolls, thereby allowing shaft rotation of the transfer rolls to be performed well.

Description

Roller conveyor device in the kiln for ceramic electronic parts{R0LLER CONVEYER APPARATUS F0R SINTERRING FURNACE OF CERAMIC ELECTRONIC-PARTS}

The present invention relates to a kiln for ceramic electronic components, and in particular, in a kiln for ceramic electronic components that facilitates the operation of a roller conveyor in a tunnel-type kiln for firing ceramic electronic components such as a multilayer ceramic capacitor (MLCC). It relates to a roller conveyor device.

In general, ceramic electronic products such as multilayer ceramic capacitors (MLCC) and piezoelectric materials are formed into ceramic molded products by molding ceramic raw materials into a predetermined shape, and then subjected to a binder removal process, a firing process, and a cooling process in a sintering furnace. Production is completed.

More specifically, the ceramic molded product is baked in a sintering furnace at a temperature of 230°C to 450°C to remove the binder component, and the ceramic molded article is calcined at a temperature of 800°C to 1300°C for 10 to 24 hours. After the firing is completed, a cooling process of cooling to a low temperature is continuously performed. The ceramic molded product fired in the sintering furnace is completed into a ceramic product by coating and forming external electrodes and terminal electrodes on the outer circumferential surface of the ceramic product during plating.

The kilns for firing ceramic moldings are divided into batch type and tunnel type according to their structure, and the tunnel kilns are push-type and push-type according to the method of entering the ceramic moldings into the kilns. It is divided into a roll type.

The batch-type kiln can realize various firing conditions, which is advantageous for firing ceramic parts in the form of chips of various sizes and characteristics, but has a feature of limited rapid temperature rise. In addition, the tunnel type kiln is excellent in temperature and atmosphere stability inside the kiln because the to-be-fired material is moved by a pusher or roller between heating elements that are constantly heated.

Among these types of kiln, the tunnel type roller conveyor kiln is often used to fire ceramic electronic components such as multilayer ceramic capacitors (MLCC).

In the tunnel-type roller conveyor type kiln, hundreds to thousands of conveying rolls in the width direction over the entire length of the kiln are installed on a shaft so that they can rotate closely. In addition, a high temperature of hundreds to thousands of degrees Celsius must be maintained inside the kiln. For this purpose, a number of heating elements are arranged and installed.

The high temperature inside the kiln is transferred to the shaft of the conveying roll and heat is transferred to the bearing bearings, and the heat transfer temperature rises to 280~290℃. Accordingly, there is a problem in that the lubricating oil painted on the bearing bearing is hardened, and as a result, a phenomenon in which the conveying roll does not rotate well is caused.

Unexamined Patent Publication No. 10-2012-0114113 "Roller Chain Conveyor"

Accordingly, an object of the present invention is to provide a roller conveyor device in a sintering furnace for ceramic electronic components that facilitates the transfer operation of a roller conveyor despite the high temperature inside the kiln for firing ceramic electronic components being transferred to the bearing of the transfer roll. .

The present invention according to the above object is a roller conveyor device in a sintering furnace for ceramic electronic components, a plurality of transfer rolls for transferring a molded ceramic electronic component, shaft bearings installed at both ends of each transfer roll, and a plurality of It is composed of a shaft frame in which the shaft bearing insertion holes are arranged, and a cooling gas inlet hole is formed in each shaft bearing insertion hole of the shaft frame, and each cooling gas inlet hole is configured to communicate with a cooling gas conduit through which the cooling gas flows. It is characterized in that the cooling gas is injected into the shaft bearing.

In addition, in the present invention, each cooling gas inlet hole is formed on the upper part of the shaft frame, and the cooling gas inlet hole is configured to communicate with the cooling gas conduit through each branch hole of the cooling gas conduit having a different diameter, The cooling gas is characterized in that it is composed of the same gas as the atmosphere gas of the kiln.

The present invention cools the bearings even though the high temperature inside the sintering furnace for firing ceramic electronic components is transmitted to the bearings of the conveying rolls, so that the conveying operation of the roller conveyor is smooth.

1 is a front cross-sectional view of a sintering furnace furnace body according to an embodiment of the present invention,
2 is a cross-sectional configuration diagram of a kiln furnace body according to an embodiment of the present invention,
3 is an enlarged configuration diagram of a dotted circle portion indicated by "A" in the furnace body shown in FIG. 1 according to the present invention;
4 and 5 are an exploded perspective view of the transport roll bearing portion of FIG. 3,
Figure 6 is a longitudinal cross-sectional view of the transport roll bearing according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a front cross-sectional configuration diagram of a tunnel-type kiln furnace body 10 applied as an embodiment according to the present invention, and FIG. 2 is a cross-sectional configuration of a tunnel-type kiln furnace body 10 applied as an embodiment according to the present invention. Is also.

The firing furnace 2 of the present invention shown in FIGS. 1 and 2 is a roller conveyor type such as a roller hearth kiln suitable for firing ceramic electronic components such as a multilayer ceramic capacitor (MLCC). It is a kiln.

The roller conveyor type sintering furnace is a tunnel type, and has an input part for inserting the molded ceramic electronic component to be fired, and a discharge part for discharging the molded ceramic electronic component that has been fired. Between the input part and the discharge part, there is a tunnel-type A kiln furnace body 10 is provided.

The kiln furnace body 10 is a refractory tunnel structure, and is largely composed of three areas of a preheating part, a firing part, and a cooling part, and hundreds to thousands of conveying rolls (20 in FIG. 1) in the width direction over the entire length of the kiln The shaft is installed to enable tight rotation. In addition, a high temperature of hundreds to thousands of degrees Celsius must be maintained inside the kiln furnace body 10. For this purpose, a plurality of heating elements 30, 32, 40 are arranged and installed.

The kiln furnace body 10 is composed of a module type made of refractory material and lightweight insulation material or ceramic fiber, and these modules are connected by several to dozens to have one kiln as in an example of the present invention.

As shown in FIGS. 1 and 2, a conveyor type transfer roll 20 is arranged so that a number of setters 22 containing a ceramic electronic component molded product, that is, a ceramic electronic component molded product, can be transferred to the firing unit furnace body 10. In addition, on the conveyor type transfer roll 20, a plurality of setters 22 containing moldings of numerous ceramic electronic components, such as a multilayer thin-film ceramic capacitor (MLCC), are stacked and placed in a row.

In addition, in order to create an even temperature distribution for all the ceramic electronic component molded articles contained in the setters 22 placed on the transfer roll 20, in the present invention, the upper and lower sides of the transfer roll 20 in the firing unit furnace body 10 Corresponding to the upper heating element 30 and the lower heating element 32 are provided, and the side heating element 40 may be further provided so that the entire inside of the tunnel of the firing unit furnace body 10 is advantageous in maintaining a uniform temperature gradient. have.

For example, in the case of the firing process for the manufacture of multilayer thin-film ceramic capacitors (MLCC), it is determined whether the product is defective or not for a temperature distribution change of 3 to 4°C. The temperature distribution inside the furnace body 10 is uniform. Since it is very important to be maintained, it is desirable to employ a number of types of heating elements 30, 32, and 40, and a plurality of temperature sensors 50, 52 for uniform temperature control inside the furnace body 10 (54) are also installed.

In the kiln furnace body 10, an electronic component to be fired, such as a ceramic capacitor (MLCC), is subjected to atmospheric sintering, and thus an exhaust port 36 is provided as well as an atmosphere gas injection hole 34 for injecting an atmosphere gas. The atmosphere gas used when a ceramic electronic component molded article such as a ceramic capacitor (MLCC) is sintered in an atmosphere is mainly a mixture of nitrogen (N ₂ ) gas and hydrogen (H ₂ ) gas.

In the sintering furnace furnace body 10 as described above, since the firing is performed by raising the temperature to a temperature of around 1000°C, the high temperature inside the sintering furnace furnace body 10 is transferred to the shaft of the transfer roll 20 and heat is transferred even to the bearing bearing. , The inventor confirmed that the heat transfer temperature at that time would rise to 280 to 290°C.

This causes a phenomenon in which the lubricant painted on the bearing of the transfer roll 20 is hardened, and as a result, there is a phenomenon that the transfer roll 20 does not rotate well. In the present invention, the bearing of the transfer roll 20 is cooled. Note that this problem is solved by implementing configuration.

3 is an enlarged configuration diagram of a dotted circle portion (transfer roll bearing portion) indicated by “A” in the kiln furnace body 10 shown in FIG. 1 according to the present invention, and FIGS. 4 and 5 are the transfer rolls of FIG. It is an exploded perspective view of the bearing part, and FIG. 6 is a longitudinal sectional view of the transfer roll bearing part according to the present invention.

The roller conveyor device in the sintering furnace for ceramic electronic components according to an embodiment of the present invention includes a plurality of transfer rolls 20 for transferring the molded ceramic electronic component contained in the setter 22, and each transfer roll 20 The shaft frame 60 shown in FIGS. 3 to 6 is installed as a bearing portion of both side ends of the. A shaft bearing 64 axially coupled to the shaft rod 28 of the transfer roll 20 is installed on the shaft frame 60.

That is, the shaft frame 60 supporting the left and right sides of the transfer roll 20 is inserted as many shaft bearings as the number of the transfer rolls 20 to serve as a support for the shaft bearings 64 of the numerous transfer rolls 20 arranged. The balls 62 are formed in an array, and a shaft bearing 64 is installed together with the shaft rod 28 of the feed roll 20 in each bearing insertion hole 62. In addition, a chain sprocket 29 connected to a chain serving as a conveyor is mounted at the front end of the shaft bar 28.

Lubricating oil is injected into the shaft bearing 64 of the transfer roll 20 installed on the shaft frame 60 in order to provide smooth rotation, and the temperature transferred from the kiln body 10 at around 1000℃ is 280~290 Since the amount is about °C, the lubricating oil injected into the shaft bearing 64 is hardened, which causes a problem in the rolling motion of the shaft bearing 64 of the transfer roll 20.

Accordingly, in the present invention, as shown in FIG. 5, the shaft part frame 60 has a cooling gas inlet hole 66 communicating with each of the shaft bearing insertion holes 62, and the cooling gas inlet hole 66 is formed. The cooling gas (CG) is injected into the shaft bearing insertion hole 62 through the shaft bearing 64 so that the shaft bearing 64 is cooled.

In the present invention, in order to provide cooling gas (CG) to the shaft bearing 62, a cooling gas conduit 70 in communication with the cooling gas supply is provided, and the cooling gas inflow of the shaft frame 60 is in the cooling gas conduit 70. Branch holes 72 that correspond to the holes 66 to fit the holes are formed.

In order to seat the pipe-shaped cooling gas conduit 70 on the shaft frame 60, the upper surface of the shaft frame 60 in which the cooling gas inlet holes 66 are regularly arranged has an arc shape as shown in FIG. The seating groove 68 is configured to be formed along the length direction. And each cooling gas inlet hole 66 is configured to be formed on the bottom surface of the seating groove 68 of the shaft frame 60, but is configured to be in communication with the shaft bearing insertion hole 62 facing downward.

The cooling gas conduit 70 mounted longitudinally on the upper mounting groove 68 of the shaft frame 60 is cooled in a state in which the branch holes 72 are aligned with the cooling gas inlet holes 66 of the shaft frame 60 The gas conduit 70 is fastened and fixed to the shaft frame 60 by a fastening bracket 74.

Cooling with the cooling gas inlet holes 66 of the shaft frame 60 to facilitate alignment between the branch holes 72 of the cooling gas conduit 70 and the cooling gas inlet holes 66 of the shaft frame 60 The branch holes 72 of the gas conduit 70 form different apertures. Preferably, as shown in FIG. 6, the diameter of the cooling gas inlet hole 66 of the shaft frame 60 is formed relatively 2 to 3 times larger than the diameter of the branch hole 72 of the cooling gas conduit 70 do.

Therefore, the cooling gas (CG) is supplied by the cooling gas supply and transmitted through the cooling gas conduit 70, branched from each branch hole 72 of the cooling gas conduit 70, and then each cooling gas flows into the shaft frame 60. By spraying each of the shaft bearing insertion holes 62 through the holes 66, the shaft bearings 64 at both ends of the transfer roll 20 receiving heat of about 280 to 290°C are cooled.

In addition, in the present invention, the cooling gas (CG) from which the shaft bearing 64 is injected may penetrate into the kiln furnace body 10 and adversely affect the sintering, so the cooling gas flowing in the cooling gas conduit 70 to prevent this ( CG) is composed of the same gas as the atmospheric gas used in the kiln body 10.

For example, if a ceramic electronic component molded article such as a ceramic capacitor (MLCC) is used as a mixture of nitrogen (N ₂ ) gas and hydrogen (H ₂ ) gas in the atmosphere sinter furnace body 10, cooling gas (CG ) Also, a mixture of nitrogen (N ₂ ) gas and hydrogen (H ₂ ) gas is used. Therefore, there is no problem due to the cooling gas of the shaft bearing when firing the electronic component molding.

In the above description of the present invention, specific embodiments have been described, but various modifications may be made without departing from the scope of the present invention. Therefore, the scope of the present invention should not be determined by the described embodiments, but should be determined by the claims and equivalents to the claims.

(2)-- Kiln (4)-- Input section
(6)-- Roche tunnel furnace (8)-- Discharge section
(10)-- Kiln furnace body (12)-- Insulation
(20)-- Conveyor transfer roll (22)-- Setter
(28)-- Shaft bar (29)-- Chain sprocket
(30)-- Upper heating element (32)-- Lower heating element
(34) - Atmospheric gas injection hole (36) - Atmospheric gas exhaust port
(40)-- Drawer-type auxiliary heating element (60)-- Shaft frame
(62)-- Shaft bearing insert hole (64)-- Shaft bearing
(66)-- Cooling gas inlet hole (68)-- Seating groove
(70)-- Cooling gas conduit (72)-- Branch hole
(74)-- Binding bracket

Claims (3)

In a roller conveyor device in a kiln for ceramic electronic components,
A plurality of transfer rolls for transferring the ceramic electronic component molding,
Shaft bearings installed at both ends of each of the plurality of transfer rolls,
A plurality of shaft bearing insertion holes are formed in an array, and a side end shaft bearing of each transfer roll has a shaft portion frame corresponding to each of the shaft bearing insertion holes,
An arc-shaped seating groove is formed on the upper portion of the shaft frame, and cooling gas inlet holes communicating with each of the plurality of shaft bearing insertion holes are formed in the seating groove,
The cooling gas conduit, which has branch holes that are aligned with each of the cooling gas inlet holes, and flows the same cooling gas as the atmosphere gas of the kiln, is configured to be seated and tied to the seating groove of the shaft frame, and the cooling gas flows from the cooling gas conduit to the shaft frame. A roller conveyor device in a kiln for ceramic electronic components, characterized in that the cooling gas branched into balls and applied to the shaft bearing insertion hole cools the shaft bearings of each transfer roll. delete delete

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