JPS6138986B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a method for placing an object to be fired, such as a tile base, which has an uneven shape on its basic surface, which is used for placement, in a furnace. The present invention relates to a continuous firing furnace for firing by placing it on a conveying means.

[Conventional technology]

Conventionally, as a continuous firing furnace, there is a roller hearth kiln 1 as shown in FIG. That is, the roller hearth kiln 1 has left and right furnace walls 2a, 2b of the furnace body 2.
The conveyor roller 4 is inserted into the insertion holes 3, 3 drilled in the furnace body 2, and the roller supports 5, 6 arranged outside the furnace body 2 are inserted.
The end of the conveyance roller 4 is attached to. and,
The chain sprocket 5a attached to the roller support 5 is engaged with the drive chain 7 to drive the conveyance roller 4 at a predetermined rotational speed, and the object to be fired (not shown) placed on the conveyance roller 4 is moved in the furnace. I'm trying to transport it.

[Problem that the invention seeks to solve]

However, as shown in FIG. 7, when the object to be fired 8 is a tile base or the like, an uneven shape consisting of protrusions 8b, 8b, etc. is attached to the back surface 8a, which is the basic surface used when it is placed. In this case, in the roller hearth kiln 1, the protrusion 8b of the object to be fired 8 rides on the conveyor roller 4 during conveyance and then falls into the gap between the conveyor rollers 4, 4, so that the object to be fired 8 vibrates vertically. He was being transported. In this way, when the objects to be fired 8 that are being conveyed vibrate up and down, a meandering phenomenon occurs, causing collisions between the objects to be fired 8 and the furnace walls 2a, 2.
In addition to being damaged by the collision with b, the conveyance rollers 4 were also damaged, making conveyance impossible. Therefore, the conventional firing furnace 1 had a drawback in that it was not possible to fire an object to be fired that had an uneven shape on the basic surface used when it was placed.

Further, the width of the conveyance roller 4 cannot be increased due to restrictions such as strength (general maximum effective width is 1.8 m). Therefore, a long object to be fired (not shown) that is longer than the effective width dimension of the conveyance roller 4
When firing, it was necessary to align the longitudinal direction of the object to be fired along the conveyance direction. However, in this case, since the set temperature distribution in the furnace changes along the conveyance direction, thermal stress is generated in the object to be fired while being conveyed in the furnace, resulting in warping or damage. Therefore, conventional firing furnaces have a limit in firing long objects to be fired.

[Purpose of the invention]

The present invention improves and eliminates the above-mentioned problems of the conventional art, and the object to be fired, which has an uneven shape on the basic surface used for mounting, is transported inside the furnace in a stationary state. It is an object of the present invention to provide a continuous firing furnace that can perform continuous firing while increasing the firing rate, and can also make the effective width of the means for conveying the fired object larger than that of conventional firing furnaces.

[Means for solving problems]

Means for solving the above problems of the present invention are:
This is a firing furnace for firing objects to be fired, which have regular uneven shapes on the base surface used when placing the objects. A plurality of endless chains are arranged to pass through the furnace in the conveyance direction with appropriate left and right intervals corresponding to the shape, and a heat-resistant material is arranged in a substantially straight line in the furnace and guides the endless chains. a chain guide molded in ing.

[Effect]

As shown in the embodiments of FIGS. 1 to 4, protrusions 8b, 8b...
Object to be fired 8 with a regular uneven shape made of
(see FIG. 7 for both) is placed on a plurality of endless chains 15 whose left and right intervals W are determined in accordance with the uneven shape, and the chains 15
transported by. With such a conveyance mechanism, the uneven shape of the conveyed object 8 itself works to prevent it from separating from the endless chain 15, and stable conveyance can be obtained. Further, there is no mutual interference between the transport mechanism and the transported object 8. Furthermore, it is possible to increase the number of endless chains 15 installed, and to adopt a furnace structure so as to burn even objects having a long width.

The configuration of the present invention will be explained below based on the embodiments shown in the drawings.

〔Example〕

1 to 4 show an embodiment of the present invention. In the following description, the front refers to the right side of FIGS. 1 and 2, the back refers to the left side of the same figures, the right refers to the right side of FIG. 3, and the left refers to the left side of the same figures.

As shown in FIG. 1, the furnace body 10 is constructed of refractory bricks or the like on a pedestal 11, and is divided into a preheating zone, a firing zone, and a cooling zone along the front and back direction.

In an appropriate area or almost the entire area formed on the outside of the furnace body 10 from the carry-in area A to the carry-out area B, there are provided an endless chain 15, which will be described later, on the outer furnace frames 12 and 13 and the inner furnace frame 14. guide rail 1
6, 16... at appropriate intervals W on the left and right (see Figures 2 and 3).
(see figure) and laid along the front and back direction to form the chain guide 17. Note that this interval W is based on the projection 8 formed on the basic surface (back surface) 8a of the object to be fired 8 shown in FIG.
b, 8b, . . . are set corresponding to regular uneven shapes. Here, "regular" does not mean that the dimensions between the concave and convex portions are constant, but rather that the shape of the concave and convex portions is uniformly determined in advance for all. Further, the guide rail 16 is made of heat-resistant steel (for example,
It is molded from a heat-resistant material such as SUS304, SUH31, SUH301, etc.), carbide, nitride, silicide, or ceramic coating, and as shown in FIG. It is formed. An appropriate number of sets of auxiliary drive means 18 are provided at appropriate locations within the furnace as required to reduce the driving tension of the endless chain 15. As shown in FIGS. 1 and 2, the auxiliary drive means 18 has an auxiliary drive shaft 21 to which driving chain sprockets 19, 19, . . . Axis 21
Both ends are pivotally supported on frames 22, 22 outside the furnace, and are driven in synchronization with a main drive means 23, which will be described later. Note that the chain guide 17 is not limited to the embodiment using the guide rail 16,
Although not shown in the drawings, it is of course possible to construct an idler consisting of a free-rotating chain sprocket or the like, appropriately disposed at each front and rear pitch.

The main drive means 23 has a drive shaft 24, to which synchronous drive chain sprockets 25, 25, etc. are fixed, pivoted at both ends of the drive shaft 24 on an outside furnace mount 13, and the drive shaft 24 is a drive source consisting of a variable speed motor, a speed reducer, etc. 26 and rotates at a desired number of rotations. A transmission means 27 consisting of a line shaft, a gear box, etc. for driving the auxiliary drive means 18 extends from the drive source 26 . An appropriate number of sets of reversing means 29 having reversing chain sprockets 27, 27, .

One endless chain 15 for conveying the object to be fired is stretched between each synchronous drive chain sprocket 25 of the main drive means 23 and the reversing chain sprockets 27, 27, . . . of the reversing means 29. The stretched endless chain 15 is
Passing through the chain passage formed by the chain guide 17, from the carry-in area A through the inside of the furnace to the conveyance area B.
A linear conveyance area is formed in the area leading to . The endless chain 15 has structural members such as link plates 15a and connecting pins 15b made of heat-resistant steel (for example, SUS304, SUH31,
SUH301, etc.), carbide, nitride, silicide, or ceramic coating. Note that the tension structure of the endless chain 15 is not limited to the one in which one endless chain 15 is stretched so as to pass through the preheating zone, firing zone, and cooling zone in the furnace, and is not shown in the drawings. The chain tensioning area is divided into, for example, a preheating zone, a firing zone, a cooling zone, etc., and in each section, a plurality of endless chains are stretched at appropriate intervals on the left and right, and all the endless chains are driven synchronously. Of course, this is also possible.

FIG. 5 shows the main part of an embodiment of another aspect of the present invention, and the difference from the above embodiment is that no convex strip is formed on the upper surface of the guide rail 16', and the adjacent endless chain 15 is not formed on the upper surface of the guide rail 16'. Connecting rods 30 are installed horizontally between the chains 15' and 15' at appropriate front and rear pitches, and the left and right spacing between the endless chains 15' and 15' is
The point is that W' is held constant so as to correspond to the uneven shape of the object to be fired 8, and is configured so as not to meander.

Next, the operating mode of the firing furnace configured as described above will be explained.

As shown in FIG. 2, the drive source 2 of the main drive means 23
6, as the drive shaft 24 rotates, the synchronous drive chain sprocket groups 25, 25...
rotate synchronously at the desired rotation speed. Therefore, all the endless chains 15, 15, . . . move synchronously from the carry-in area A to the carry-out area B within the linear conveyance area where the guide rails 16 of the chain guides 17 are laid. Next, the object to be fired 8 is placed from above the carry-in area A onto the endless chains 15, 15, 15 which are being driven in a set of a plurality of chains (three in the embodiment shown in FIG. 3). . As shown in FIG. 3, the object to be fired 8 is placed in a state in which the concave portions of the basic surface (back surface) 8a used for the placement are fitted into the endless chains 15, 15, 15. Then, the object to be fired 8 is fired while passing through the pre-heating zone, firing zone and cooling zone in the furnace body 10 while being conveyed to the endless chains 15, 15, 15, and is conveyed to the unloading area B, where it is transferred to the next step ( (not shown). With such a conveyance method, the uneven shape of the object to be fired 8 is similar to that of the endless chain 1.
5, 15, and 15, and stable conveyance can be obtained in all conveyance areas. Further, the protrusions 8b, 8 of the object to be fired 8
b... will never interfere with the endless chain 15, 15, 15 as a conveying means,
The object to be fired 8 will not be damaged during transportation. This has a very important meaning since the object to be fired 8 is softened during firing.

Further, when firing a long object to be fired (not shown), the object is placed on the endless chains 15, 15, . It should be noted that the object to be fired may have an uneven shape on the basic surface used when it is placed, and the uneven shape and the overall shape are arbitrary.

〔Effect of the invention〕

As is clear from the above explanation, the present invention has the following excellent effects.
In other words, the object to be fired, which has a concavo-convex shape on its basic surface, is placed on the endless chain with its recesses fitted into the endless chain, and is directly transported through the linear conveyance area in the furnace. As the chain passes through the chain, the concave and convex portions work to prevent positional deviation from the chain, and conveyance can be achieved in a stationary and stable state without any vertical vibration. As a result, there is no mutual interference between the firing furnace, including the endless chain, and the objects to be fired, which not only prevents the firing furnace from damaging the objects to be fired, but also prevents the objects to be fired from smoothly transporting the endless chain. Not at all. Therefore, stable conveyance can be maintained for a long time.

Furthermore, since there are no restrictions on the spacing between adjacent endless chains and the number of endless chains, it is possible to provide a firing furnace with a larger effective width than conventional continuous firing apparatuses. As a result, even long objects to be fired, which were previously considered impossible, can be fired by placing them on the endless chain with their longitudinal direction aligned in the left-right direction. Simultaneous firing (uniform firing) can be performed over the entire area, and firing without warping or damage can be obtained. That is, according to the firing furnace of the present invention, it is possible to obtain firing of excellent quality.

Furthermore, a plurality of endless chains are arranged in parallel corresponding to the uneven shape formed on the basic surface used when placing the object to be fired. As a result, the firing furnace is capable of continuously firing even objects that have conventionally been considered impossible to fire continuously due to their uneven basic surface. That is, it is possible to significantly improve firing efficiency. Furthermore, by monitoring each endless chain from one location, you can see the entire length of the chain, making maintenance of the chain extremely easy and dramatically improving the operating efficiency of the kiln. It is.

[Brief explanation of the drawing]

1 to 5 show an embodiment of the firing furnace according to the present invention, in which FIG. 1 is a partially omitted left sectional view, FIG. 2 is a partially omitted plan sectional view of the same, and FIG.
The figure is a sectional view taken along the same line as above, FIG. 4 is an enlarged cross-sectional view showing an endless chain guided on a guide rail, and FIG. 5 is an enlarged cross-sectional view showing another embodiment of an endless chain guided on a guide rail. FIG. 6 is a transverse cross-sectional view showing the essential parts of a conventional roller hearth kiln, and FIG. 7 is a partially cutaway perspective view of the object to be fired, viewed from the back side. 15... Endless chain, 17... Chain guide, 25... Synchronous drive chain sprocket.

Claims (1)

[Claims] 1. A firing furnace for firing an object to be fired, which has a regular uneven shape on the basic surface used during mounting, and a furnace body with openings at both ends in the front and back direction;
A plurality of endless chains are arranged to pass through the furnace in the conveying direction at appropriate left and right intervals corresponding to the uneven shape of the object to be fired, and a plurality of endless chains are arranged in a substantially straight line in the furnace, and the endless chains A chain guide molded from a heat-resistant material that guides the
A firing furnace comprising a group of synchronously driven chain sprockets that mesh with the endless chain, and wherein the uneven shape of the object to be fired is placed and conveyed along the plurality of endless chains.