JPH0814770A - Shelf assembly of baking bogie - Google Patents

Abstract

PURPOSE:To provide a shelf assembly of a baking bogie in which a total weight of the shelf legs is reduced, a thermal loss caused by brought-out heat calorie is reduced and at the same time an irregular baking can be reduced. CONSTITUTION:Pairs of beams 4, 4 made of a Si-SiC baked material are arranged between shelf legs 2 and 3. A span between the shelf legs 2 and 3 can be set to three to five times of that of the prior art. It is preferable that in order to accommodate for a thermal expansion of the beams 4, the base part of the shelf leg 2 supporting one end of the beam 4 is placed on a car top 1. In addition, it is preferable that wall bricks 5 are fitted to both ends of the beam 4 so as to prevent the tiles from being fallen and further to prevent the beam 4 from being displaced in a width direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shelf assembly for a trolley for firing used for firing ceramics such as roof tiles.

[0002]

2. Description of the Related Art As shown in FIG. 5, a shelf assembly of a firing truck that has been generally used in the past has a car top 11 for firing trucks.
Stand a large number of shelf legs 12 at regular intervals,
The structure is such that a shelf plate 13 is placed between each. Shelf board 13
As and bending strength of several 10 to 200 / cm ² of about alumina refractories, mullite refractories, silicon carbide and the like are used argillaceous binding, shelf board 13 when loaded with tiles on its upper surface
In consideration of the amount of bending and bending stress, the span of the shelf legs 12 and 12 and the length of the shelf plate 13 are usually about 500 to 600 mm. Also, when the length of the shelf plate 13 is about this amount, the amount of thermal expansion is also small, so that the base of the shelf leg 12 is embedded in the car top 11.

However, in the case of the conventional rack for firing trucks as described above, when the width of the firing truck is 3000 mm, it is necessary to provide about six shelf legs 12 in the width direction as shown in FIG. There are 9 shelves in the longitudinal direction as shown in FIG.
When 13 are arranged, it is necessary to arrange a large number of shelf legs 12 of 54 per car. Moreover, it is necessary to arrange many shelf boards accompanying this. For this reason, the total weight and heat storage amount of refractories that are not directly manufactured products such as these shelf legs 12 become very large, and they are directly related to fuel consumption, which is a high ratio of the manufacturing cost of products such as roof tiles, from the firing furnace. The heat loss due to the amount of heat taken out was so large that it could not be ignored.

Further, in the conventional rack of a truck for firing, since the tiles are placed on the flat shelf plate 13 for firing, the shelf plate 13 hinders the flow of the firing gas in the vertical direction, and There is also a problem that uneven burning may occur at the bottom.

[0005]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems and reduces the total weight of the shelf legs and the shelf legs to reduce the heat loss due to the amount of heat taken out and to reduce the uneven baking. The present invention was made to provide a new shelf assembly for a trolley for firing which can also be achieved.

[0006]

Means for Solving the Problems A shelf assembly of a trolley for firing of the present invention, which has been made to solve the above problems, is made of a Si-SiC sintered body between shelf legs erected on a car top. It is characterized by having a pair of beams installed. In addition,
It is preferable that the base portion of the shelf leg that supports one end of the beam is embedded in the car top, and the base portion of the shelf leg that supports the other end is placed on the car top. Furthermore, it is preferable to insert a wall brick having a through hole for inserting a beam in the lower portion at both ends of the pair of beams.

[0007]

According to the present invention, a conventional flat plate shelf is replaced with a beam made of a Si-SiC sintered body having a very high bending strength at a high temperature of 2500 kg / cm ² and a small thermal expansion. Then, the roof tiles are placed on it and firing is performed. In this way, the beam intensity is more than 10 times greater than the conventional product,
The span of the shelf legs can be increased to, for example, 1500 to 3000 mm, which is 2 to 5 times larger than the conventional one. Therefore, the number of shelf legs per car can be reduced to less than half that of the conventional one, and since Si-SiC beams with a light specific gravity are used instead of the conventional flat shelf plate, the number of shelf legs and shelf plates is the same. The total weight of the beam and the amount of heat taken out can be significantly reduced. Moreover, in the present invention, since the roof tile is placed on the pair of beams and fired, the gas is better around and the firing unevenness does not occur, as compared with the conventional shelf plate.

According to a second aspect of the present invention, the base of the shelf leg supporting one end of the beam is embedded in the car top, and the base of the shelf leg supporting the other end is placed on the car top.
The thermal expansion of the beam during high temperature firing can be absorbed by sliding the shelf legs on the car top. Furthermore, by inserting wall bricks at both ends of the beam as in claim 3, it is possible to prevent the roof tiles from collapsing and also to keep the distance between the beams constant.

[0009]

The present invention will be described below in more detail with reference to the illustrated embodiments. FIG. 1 is a sectional view of an upper portion of a car top showing an embodiment of the present invention, and FIG. 2 is a plan view thereof. In FIG. 1, 1 is a car top of a firing truck, 2 and 3 are shelf legs that are erected on the car top 1, and 4 is a Si-SiC sintered body that is horizontally installed between these shelf legs 2 and 3. Is a pair of beams.

The Si-SiC sintered body is composed of SiC and 25% by weight or less of Si.
It can be manufactured by a method in which Si powder and C powder are mixed with SiC powder, extrusion molded, and fired at 1300 to 1400 ° C. It is also possible to form a beam from carbon or carbon fiber and react it with Si to obtain a Si-SiC sintered body. In addition to this, it can be manufactured by a method of impregnating recrystallized silicon carbide with Si. A more detailed manufacturing method of the Si-SiC sintered body is described in Japanese Patent Application Laid-Open No. 6-1660 filed by the present applicant.

The beam 4 made of this Si-SiC sintered body has excellent heat resistance and thermal shock resistance, and as described above, there is almost no change from room temperature to hot strength at 1300 ° C., and 2500 kg / It has a very large bending strength of cm ² . Therefore, the span between the shelf legs 2 and 3 is 500
Even if it is very large from 600 mm to 1500 to 3000 mm, there is no problem in strength. In the embodiment, since the span between the shelf legs 2 and 3 is 1500 mm with respect to the trolley for firing of 3000 mm width, three shelf legs 2 and 3 may be erected in the width direction. Further, as shown in FIG. 2, when the beams 4 are arranged in 9 rows in the longitudinal direction of the bogie as in the conventional case, the number of shelf legs per one bogie can be 27, which is half of the conventional case.

As described above, according to the present invention, the span between the shelf legs 2 and 3 is expanded, and therefore the length of the beam 4 is three times as long as that of the conventional example, so that the thermal expansion coefficient of Si-SiC is small.
Even if a sintered body is used, the total expansion length during firing becomes large. Therefore, as shown in FIGS. 1 and 3, the shelf leg 3 that supports one end of the beam 4 is integrally formed, and its base is embedded in the car top 1, and the shelf leg 2 that supports the other end of the beam 4 is The base was placed on the car top 1. If the shelf legs 2 and 3 have such a structure, there is an advantage that the shelf legs 2 can slide on the car top 1 and absorb the thermal expansion even when a large thermal expansion occurs in the beam 4.

The roof tile is placed on the upper part of the pair of beams 4 to be fired. The wall bricks 5 shown in FIGS. 3 and 4 are inserted at both ends of the beam 4 to prevent the roof tile from collapsing. It is preferable to prevent it. The material of the wall brick 5 may be ceramic, but from the viewpoint of strength, lightness and heat capacity, it is desirable to use Si-SiC, which is the same as the beam. A through hole 6 for inserting a beam is formed in the lower part of the wall brick 5, and the beam 4
Both end portions of are inserted into these through holes 6, 6. As a result, the wall brick 5 is vertically supported to prevent the tile from collapsing, and at the same time, the mutual distance between the pair of beams 4 and 4 can be kept constant. Therefore, there is an effect that the roof tile can be stably supported.

[0014]

As described above, according to the shelf assembly of the truck for firing of the present invention, the beam made of the Si-SiC sintered body having a large hot strength is used instead of the conventional shelf plate. , The span of the shelf legs can be greatly expanded. Therefore, since the number of shelf legs can be reduced, it is possible to reduce the total weight of the shelf legs per one car for firing and to reduce the heat loss due to the amount of heat taken out. Further, according to the shelf assembly of the truck for firing of the present invention,
Since the beam is used instead of the conventional shelf plate as the support for the roof tile, the surrounding of the firing gas is good, and the uneven burning can be reduced.

Further, if the base of the shelf leg supporting one end of the beam is placed on the car top as in the embodiment, the thermal expansion of the beam can be absorbed. Further, by using the wall brick as in the embodiment, it is possible to obtain the effect of preventing the roof tiles from collapsing and keeping the distance between the beams constant.

[Brief description of drawings]

FIG. 1 is a sectional view of an upper portion of a car top showing an embodiment of the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is an enlarged cross-sectional view of an example.

FIG. 4 is a perspective view showing a wall brick according to an embodiment.

FIG. 5 is a sectional view of an upper portion of a car top showing a conventional example.

FIG. 6 is a plan view of FIG.

[Explanation of symbols]

1 cartop, 2 shelf legs, 3 shelf legs, 4 Si-SiC sintered beam, 5 wall bricks, 6 through holes

Claims (3)

[Claims] 1. Si-S is provided between shelf legs erected on the cartup.
A shelf assembly for a trolley for firing, which is constructed by installing a pair of beams made of an iC sintered body. 2. A structure in which a base of a shelf leg that supports one end of a beam is embedded in a car top, and a base of a shelf leg that supports the other end is placed on the car top.
A rack assembly for a trolley for firing described in. 3. A shelf for a firing truck according to claim 1, wherein a wall brick having a through hole for inserting a beam at a lower portion is inserted into both ends of a pair of beams. set.