JPS6228384B2 - - Google Patents

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to a roller hearth kiln for continuously firing materials to be fired such as tile substrates, in which the conveying rollers extend in the longitudinal direction of the furnace body. While being guided inside the body, the conveying roller rotates independently of the feeding.

[Conventional technology]

Conventional roller hearth kilns have a furnace body with a tunnel-like structure or a long cylindrical structure integrally formed of refractory bricks, etc., and a large number of insertion holes bored at appropriate intervals on both side walls of the furnace body. It is composed of a large number of rollers for conveying objects to be fired, which are inserted through holes. Each of these conveyance rollers is rotatable about its own axis at a fixed position in the furnace body.

FIG. 1 shows a cross-sectional view of the conventional roller hearth kiln. That is, the conventional roller hearth kiln 1 has a furnace body 2 and a large number of insertion holes 3, 3, which are bored at appropriate intervals along the longitudinal direction in the left and right furnace walls 2a, 2b of the furnace body 2. Both ends of each conveyance roller 4 are attached to roller supports 5 and 6 disposed on the left and right outer sides of the furnace body 2, respectively. The roller support 5 on either side is provided with a drive transmission shaft coaxially connected to the conveyance roller 4, and a chain sprocket 5a is attached to the drive transmission shaft. A common drive chain 7 is meshed with a large number of chain sprockets 5a arranged along the side wall 2a of the furnace body 2. By driving the drive chain 7, the drive transmission shaft can be rotated via the chain sprocket 5a, and all the conveyance rollers 4 can be rotated around the shaft at the same desired speed and in the same direction. Therefore, the object to be fired 8 placed on the conveyance roller 4 is sequentially conveyed to the adjacent conveyance roller 4, whereby the object to be fired 8 is conveyed through the furnace and fired.

[Problem that the invention seeks to solve]

By the way, roller hearth kiln 1 with the above structure
had the following drawbacks:

B. Glaze 9 often adheres to the roller surface, so replace the conveyor roller 4' with a new conveyor roller 4.
There is often a need to replace it, but this process requires a lot of effort and time. That is, first, the roller support 6 is removed from the bracket 10, and the dirty conveyance roller 4' is pulled out from the insertion holes 3, 3. Next, a new conveyance roller 4 is inserted into the insertion holes 3, 3, and its tip end is attached to the roller support 5. Finally, conveyance roller 4
The other end is connected to the roller support 6, and the roller support 6 is fixed to the bracket 10 again, which is a complicated procedure.

By the way, a roller hearth kiln is provided with many conveyance rollers, and the above-mentioned work is necessary for each conveyance roller. Furthermore, glaze and other substances tend to adhere to the conveyor rollers installed in the high-temperature firing area, which is difficult to replace, so when replacing them, it is necessary to replace almost all of the conveyor rollers installed in the high-temperature firing area. is normal. Therefore, since the number of conveyance rollers to be replaced is extremely large (usually 400 to 500 or more), the effort and time required to replace the conveyance rollers is enormous.

In addition, when the conveyor roller 4', which is disposed in the high-temperature firing area of the roller hearth kiln and is heated to a high temperature of 1100 to 1300°C, is extracted from the insertion holes 3 and 3 as described above, the temperature outside the furnace is Because there is a large temperature difference between the two, rapid cooling can cause damage or cracks, making it possible to reuse the product. Furthermore, when a new conveyance roller 4 is inserted into the high-temperature firing area of a roller hearth kiln, similar problems occur due to rapid heating. Therefore, when replacing the conveyor rollers, the conveyor rollers to be extracted and the conveyor rollers to be newly inserted may be heated.
In order to avoid damage from shock, the furnace temperature in the high-temperature firing area had to be sufficiently lowered in advance before it could be carried out. However, it is obvious that if the temperature inside the furnace in the high-temperature firing zone is lower than a predetermined temperature, the operation of the roller hearth kiln cannot be continued. Therefore, in the conventional roller hearth kiln, a long operation stop is unavoidable every time the conveyance roller is replaced, resulting in extremely low operating efficiency.

C. If a breakage accident occurs in the conveyor roller 4 during operation of the roller hearth kiln, the broken conveyor roller 4 will fall to the bottom of the furnace, and the conveyor roller will be missing at that location. If the operation of the roller hearth kiln continues as it is, the material to be fired 8 that has been transported to the missing part of the transport roller will not be sent any further and will stagnate there, or It falls through the gap to the bottom of the furnace. Therefore, in the past, it was necessary to suspend operation of the roller hearth kiln in order to install a new conveyance roller every time a conveyance roller breakage accident occurred, resulting in a significant decrease in production efficiency. Moreover, in the conventional structure, this breakage accident is difficult to detect, and there is a risk of causing a serious accident.

[Object of the present invention]

The first object of the present invention is to make it possible to replace the conveyor rollers without reducing the temperature inside the furnace, especially in the high-temperature firing area, and without causing any damage due to heat shock. Our goal is to provide a new roller hearth kiln.

A second object of the present invention is to provide a new roller hearth kiln in which the conveying roller replacement work is simple and can be completed within an extremely short period of time.

[Means for solving problems]

The configuration of the present invention will be explained using FIGS. 2, 3, and 4A and 4B showing embodiments. In the roller hearth kiln according to the present invention, the furnace body 15 has a lower furnace half body 17 in which a furnace bottom portion 17a and left and right furnace side wall lower half portions 17b, 17b are integrally formed of refractory bricks or the like.
The upper furnace half body 16 is suspended above the lower furnace half body 17, and the furnace ceiling portion 16a and left and right furnace side wall upper half portions 16b, 16b are integrally formed of refractory bricks or the like. A conveyance roller passage A is formed between the upper half furnace body 16 and the lower half furnace body 17. On both left and right outer sides of the furnace body 15, there is a furnace body 15 at approximately the same height as the conveying roller passage A.
Conveying means 21, 21 for conveying the conveying rollers that move synchronously left and right in the longitudinal direction along the conveying roller path A.
The left and right conveying means 21, 21 are each provided with a conveying roller holding mechanism 25 consisting of chucking means 26, 27 mounted oppositely at a predetermined interval in the longitudinal direction. Conveyance roller 3
3 is made of a heat-resistant material whose length between both ends is longer than the width of the furnace body 15;
The left end and the right end are detachably held by 27, and are guided through the conveying roller path A in the longitudinal direction of the furnace body 15 as the conveying means 21, 21 move synchronously from side to side. There is. A planetary device 32 consisting of a chain sprocket is provided on the outer side of one of the left and right chucking means 26, 27 or one of the conveyance rollers 33, and the planetary device 32 is , the chucking means 26, 27, and the conveyance roller 33 are integrally rotatable around an axis. A solar device 38 is provided which includes a transmission means 39 such as a chain in a differential relationship with the planetary device 32 and a drive means 43 for driving the transmission means 39 in the longitudinal direction of the furnace body 15.

Note that the left and right transmission means 21, 21 are
After moving the endless chain as shown in the figure along the conveying roller passage A at approximately the same height as the conveying roller passage A, the furnace bottom 1 of the lower half furnace body 17 is moved.
The lower half of the furnace side wall 17b, 17 is located at a lower position than 7a.
It is also possible to construct a structure in which the suspension is stretched so as to return along the line b.

[Effect]

In the roller hearth kiln according to the present invention, the conveying roller passage A is formed between the upper half furnace body 16 and the lower half furnace body 17 that constitute the furnace body 15 due to the above configuration. Then, by moving the conveying means 21, 21 in the longitudinal direction of the furnace body 15 in the left and right direction synchronously, the conveyance roller 33 is moved in the longitudinal direction of the furnace body 15 along the conveyance roller path A. Can be guided through the furnace.

Further, since the conveying roller 33 is detachably held at both ends by chucking means 26 and 27 which are attached to the left and right conveying means 21 and 21 so as to face each other, replacement work is easy.

The planetary device 32 and the solar device 38 together with the transmission means 21 form a kind of differential rotation mechanism.
This mechanism is based on substantially the same principle as that of a differential gear. This will be explained in detail below.

As shown in FIG. 4B, a planetary device 32 consisting of a chain sprocket is provided in the chucking means 26 and is rotatable around an axis integrally with the chucking means 26 and the conveying roller 33. Further, the solar device 38 is connected to the transmission means 3 of the chain in a differential relationship with the planetary device 32.
9 and drive means 43 for driving the conduction means 39.

Chucking means 26 with a planetary device 32
(See A in the same figure)
As described above, in accordance with the driving or stopping of the feeding means 21, the feeding rollers are guided in the longitudinal direction of the furnace body 15 within the conveying roller passage A, or are stopped. At the same time,
The planetary device 32 revolves or stops along the conveyance roller path A, and due to the action of the solar device 38, it rotates or stops as described below, independently of the above-mentioned revolution. As the planetary device 32 rotates or stops, the conveyance roller 33 also rotates or stops.

When the transmission means 21 is driven to cause the planetary device 32 to revolve in the direction of the arrow F, which is the direction of conveyance of the object to be fired, when the transmission means 39 is stopped, the planetary device 32 moves in the direction of the arrow F. As it revolves in the direction, it receives a rotational reaction force from the transmission means 39 of the solar device 38, and rotates in the direction of arrow G. in this case,
The object to be fired is transported at a speed higher than the transport speed of the transport rollers 33.

In the above state, when the transmission means 39 is driven in the direction opposite to the direction of the arrow F, the rotation speed of the planetary device 32 in the direction of the arrow G increases. Therefore, the rotation speed of the conveyance roller 33 also becomes higher, so that the conveyance speed of the object to be fired increases. Conversely, if the transmission means 39 is driven in the direction of arrow F, the rotation speed of the planetary device 32 in the direction of arrow G is reduced, and as a result, the conveyance speed of the object to be fired is reduced. By increasing the driving speed of the transmission means 39 in the direction of arrow F, the rotation of the planetary device 32 can be stopped. If the driving speed of the transmission means 39 in the direction of the arrow F is further increased, the planetary device 32 can also be rotated in the direction opposite to the direction of the arrow G. In this case, the object to be fired is transported at a normally slow speed.

Further, when the driving of the transmission means 21 is stopped to stop the orbital movement of the planetary device 32, the transmission means 39 is driven in the direction opposite to the direction of the arrow F to move the planetary device 32 in the direction of the arrow G. The object to be fired can be transported by rotating it.

Further, when the transmission means 21 is driven to optically rotate the planetary device 32 in the direction opposite to the direction of the arrow F, the transmission means 39 is caused to revolve around the planetary device 32 in the direction opposite to the direction of the arrow F. If the planetary device 32 is driven at a speed faster than the above speed, the planetary device 32 can be rotated in the direction of arrow G. By appropriately adjusting this rotational speed, it is possible to convey the object to be fired at a desired speed.

As described above, by using the differential rotation mechanism constituted by the planetary device and the solar device, the rotation speed and direction of the conveyance roller can be adjusted appropriately for any conveyance speed of the conveyance roller. By selecting , it is possible to transport the object to be fired at a constant speed. Therefore, the conveyance speed of the conveyance roller can be freely changed without affecting the conveyance state of the object to be fired.

[Explanation of Examples]

Hereinafter, the present invention will be explained based on drawings showing embodiments thereof.

In addition, in the following description, "before" refers to the second
6, 7, and 8, and "rear" refers to the right side in these figures. In addition, "left" means the left side in Figures 3 to 5, Figures 9 and 10 A and B,
"Right" refers to the right side in these figures.

2 to 4 show an embodiment of a roller hearth kiln according to the present invention. As shown in FIG. 2, the furnace body 15 is divided into several sections in the front and back direction, which is the direction in which the objects to be fired are transported.
As shown in FIG. 3, each section includes an upper half furnace body 16 formed integrally with a furnace ceiling portion 16a and left and right furnace side wall upper half portions 16b, 16b made of refractory bricks or the like.
, and a lower half furnace body 17 formed by integrally forming a furnace bottom 17a and left and right furnace side wall lower half portions 17b, 17b, which are also made of refractory bricks or the like.

The lower furnace half body 17 is placed on a lower cross beam 18a of a rigidly framed frame 18. On the other hand, the upper half furnace body 16 is suspended from the upper cross beam 18b of the frame 18 near the center in a height-adjustable manner, and is supported by brackets 18c, 18c of the frame 18 at both sides. ing.

Between the upper half furnace body 16 and the lower half furnace body 17,
A gap in height is provided that does not impede movement of the conveyance roller 33. This gap is provided continuously in the direction of conveyance of the object to be fired (not shown), thereby forming a conveyance roller passage A. Inside the conveyance roller passage A, a conveyance roller 33 made of a heat-resistant material such as porcelain, whose length between both ends is longer than the width of the furnace body 15, is suspended horizontally in the width direction of the furnace body 15. 15 in the longitudinal direction.

Conveying mechanisms 20 for conveying conveyance rollers are disposed on both left and right outer sides of the furnace body 15. As shown in FIGS. 2 and 3, this transmission mechanism 20 includes a transmission means 21 consisting of an endless chain disposed on both the right and left sides of the furnace body 15, and an inverted transmission means 21 disposed at the front and rear of the furnace body 15. Chain sprocket 22,2
2, a pair of upper and lower chain guide rails 23, 23 attached to the frame 18, and a chain drive motor 24. The left and right conveying means 21, 21 are driven in synchronization with each other, and move along the conveying roller passage A at approximately the same height position as the conveying roller passage A, and move toward the furnace bottom 17 of the lower half furnace body 17.
It is arranged to return along the lower half portion 17b of the furnace side wall at a position lower than the point a.

Note that the transmission means 21 is not limited to an endless chain type. Although not shown,
Separably connect rods of about 1 to 3 meters,
Of course, it is also possible to adopt an appropriate structure such as allowing this to be guided by guide rollers provided in the frame 18 so that both left and right outer sides of the furnace body 15 can be moved back and forth.

Each of the transmission means 21, 21 has a configuration shown in FIG. 4A.
As shown in the figure, a conveyance roller holding mechanism 25 is attached. The conveyance roller holding mechanism 25 includes a plurality of sets of chucking means 26 and 27 mounted opposite each other at appropriate intervals P (see FIG. 7, for example, P=25 to 50 mm) along the front-rear direction. Each of the chucking means 26 and 27 is connected to a link pin portion 28 of an endless chain constituting the transmission means 21.
Support shafts 28, 2 integrally formed with a, 28'a
8', and rotary cylinders 30, 3 rotatably attached to the support shaft 28 via bearings 29, 29.
0', and press holders 31, 31' screwed onto the rotary cylinders 30, 30'. The press holder 3
The pressing heads 31a, 31'a of either or both of the pressers 1 and 31' are made of an elastic body such as heat-resistant rubber or a coil spring, which is stretchable in the left-right direction. Therefore, the conveying roller 33 formed in a hollow cylindrical shape is forcefully fitted between the pressing holders 31 and 31', and both ends of the roller are pressed against the pressing heads 31a and 31'.
31'a grips the transport roller 3.
3 is detachably attached to the conveyance roller holding mechanism 25. Note that if a cavity 31a' is formed inside the pressing head 31a as necessary, the conveyance roller 33
can absorb thermal expansion in the left and right direction.

The conveying roller 33 attached to the conveying roller holding mechanism 25 moves within the conveying roller passage A extending in the longitudinal direction of the furnace body 15 in accordance with the left-right synchronous movement of the conveying means 21, 21 consisting of the endless chain. It is composed of

Further, a seal plate 34 can be attached to the conveying roller 33 as required (see FIG. 6). In this embodiment, one seal plate 34 is provided for each of the two adjacent front and rear transport rollers 33, 33.
By fitting the seal plates 34 and overlapping each other, the conveying roller passage A was covered on the outer side of the furnace side wall. The seal plates 34, 34, . It is configured to be moved around. This prevents outside air from flowing into the furnace, and also prevents radiant heat inside the furnace from leaking out of the furnace from the conveyance roller passage A, thereby improving thermal efficiency.

A planetary device 32 is provided in the rotating cylinder portion 30 of the right-hand chucking means 26 (see FIG. 4A). Since the planetary device 32 is configured to rotate integrally with the chucking means 26, by rotating the planetary device 32, the conveying roller 33 can be rotated via the chucking means 26. The mounting position of the planetary device 32 is not limited to the chucking means 26, and although not shown, it can also be mounted on the conveying roller 33 (preferably near the holding end thereof).

Next, the solar device 38 that applies a rotational reaction force to the planetary device 32 for rotating the conveyance roller 33 will be explained using FIG. 2, FIGS. 4A and 4B, and FIG. 7. The solar device 38 is a transmission means 3 consisting of a second endless chain stretched so as to mesh with a chain sprocket, which is a planetary device 32.
9, a guide rail 40 (see FIGS. 4A and B) attached to the frame 18 so as to guide the second endless chain 39, and a reversing sprocket 41 that stretches the second endless chain 39.
and a gear box 42a and a line shaft 42b that transmit driving force to the reversing sprocket 41.
The driving force transmitting means 42 is composed of a variable speed motor, etc., and the driving means 43 is composed of a variable speed motor or the like (see FIG. 2). Conducting means 3 of the solar device 38
9, the planetary device 32 rotates at a desired speed (for example, 0.5 to 2 m/min) around its central axis.
min).

In the above embodiment, the planetary device 32 consists of a chain sprocket screwed onto the rotary cylinder 30, but the planetary device 32 is not limited to this. Although not shown in the drawings, it is of course possible to construct it from an appropriate transmission device such as a timing belt pulley or a friction wheel. In this case, the second endless chain 39 of the solar device 38 is composed of a timing belt if the planetary device 32 is a timing belt pulley, or a friction belt if the planetary device 32 is a friction wheel. .

Further, the conduction means 39 of the solar device 38 may be a single one that is common throughout the entire conveying area of the object to be fired, or as shown in FIG. The conduction means 39 may be arranged in a divided manner. When the transmission means 39 is arranged in sections, it is possible to give the conveying roller 33 a different rotational state for each divided region.

FIG. 5 shows a different embodiment of the conveyance roller holding mechanism from that shown in FIG. 4A. This is an endless chain 21'
An attachment 21'a is fixed to the chain, and a support 28'' of the chucking means 26' is connected to the attachment 21'a, so that the endless chain 21' and the chucking means 26' are interlocked.

Further, in this embodiment, a holder 31'' is attached to the rotary cylinder 30' which is the main body of the chucking means 26'.
Attach the conveyor roller 3 by the holder 31''.
3' is removably locked. To explain this locking structure, either one of the holders 31''
A keyway-shaped concave groove 31″c is formed along the axial direction of the
A locking ring 36 that is movable left and right is fitted onto the holding portion 31''b, and the locking ring 36 is always held inwardly (to the left) by a spring 37. direction). On the other hand, the end of the conveying roller 33' is inserted into the groove 31' of the holding part 31''b.
It is formed into an angular cross section that can be engaged with c.

The above-mentioned chucking means 26' is provided with a conveying roller 3.
3', first move the locking ring 36 fitted onto the holding portion 31''b to the right against the urging force of the spring to open the groove 31''c. Next, the end portion 33'a of the conveying roller 33' is fitted by falling into the open groove 31''c, and finally the locking ring 36 is moved to the left so as to band the fitted portion. All you have to do is move it back to .

FIGS. 10A and 10B show yet another embodiment of the conveyance roller holding mechanism 25'. This means that the right-hand chucking means 63 is connected to a bearing 5 attached to the link plates 51a, 51a of the conveying means 51 consisting of an endless chain, as shown in FIG.
2, 52, a support shaft 53 pivotally supported by the bearings 52, 52, and a guide roller 54 externally fitted on the support shaft 53 between the bearings 52, 52 so as to be rotatable independently of the support shaft 53. It is composed of a chuck head 55 fixed to the left end portion of the support shaft 53, and a planetary device 56 consisting of a chain sprocket integrally formed with the chuck head 55.

In addition, the left-side tracking means 64 is shown in FIG.
As shown in FIG. 2, bearings 57, 57 attached to the link plates 51a, 51a of the conveying means 51 consisting of an endless chain, a support shaft 58 pivotally supported by the bearings 57, 57, and a support shaft 58 supported between the bearings 57, 57. A guide roller 54 is rotatably fitted on the shaft 58 independently of the support shaft 53, and the support shaft 5
A chuck head 59 is slidably fitted in the axial direction at the right end portion of the chuck head 59, a retaining ring 60 is externally fitted on the support shaft 58 further to the right of the right bearing 57, and the retaining ring 60 and the chuck head 59 are A compression coil spring 61 is fitted between the chuck head and biases the chuck head inward (to the right).

In this embodiment, roller guide rails 62 extend parallel to the chain guide rails 23 on the left and right longitudinal beams 18e, 18e of the frame 18, respectively. By moving the guide rollers 54 along the roller guide rails 62,
Support shafts 53 and 5 of each chucking means 63 and 64
8 is configured to move while maintaining a horizontal state. Therefore, the hollow cylindrical conveying roller 33, which is detachably held by the chucking means 63, 64 of the conveying roller holding mechanism 25' configured as described above, is synchronized with the conveying means 51, 51 consisting of the endless chain. As it is driven, it is guided in the longitudinal direction of the furnace body 15 along the conveyance roller path A.

Next, the operating conditions of the roller hearth kiln according to the present invention will be explained.

When performing firing work, the transmission means 21 consisting of an endless chain is stopped, and the driving means 43 of the solar device 38 is activated to start the transmission means 39.
is driven to rotate the conveyance roller 33 at a desired speed in the direction of conveyance of the object to be fired. The object to be fired, such as a tile base (not shown) placed on the transport roller 33 on the carry-in side D, is guided by the rotating transport roller 33 and passes through the heated furnace, where it is fired and transported out. It is carried out to side E.

Alternatively, the baking work can be performed by rotating the conveyance roller 33 in the direction of conveyance of the object to be baked at a low speed that does not apply heat shock. In this case, the conveyance speed is adjusted by adjusting the revolution speed of the conveyance roller 33 and the rotation speed and rotation direction of the conveyance roller 33. In other words, when trying to convey the object to be fired at a speed higher than the above-mentioned revolution speed,
The conveying roller 33 may be rotated in the conveying direction.
This can be done by driving the conducting means 39 of the solar device 38 in a direction opposite to the transport direction, by stopping the conducting means 39, or by driving the conducting means 39 in the transport direction at a speed lower than the orbital speed. Ru.
A desired conveyance speed can be obtained by appropriately selecting the driving condition of the transmission means 39 from among the above.

Conversely, when attempting to convey the object to be fired at a speed lower than the revolution speed of the conveyance roller 33, the conveyance roller 33 is moved in the conveyance direction by driving the conduction means 39 in the conveyance direction at a speed faster than the revolution speed. All you have to do is rotate it in the opposite direction.

Furthermore, the baking operation can be performed by driving the conveying means 21 from the carry-out side E to the carry-in side D, which is the opposite direction to the direction in which the objects to be baked are transported. In this case, the conveyance roller 33 is rotated at high speed in the conveyance direction. In this case, it is possible to prevent the conveyance roller 33 from being bent and deformed when it becomes soft due to high temperature.

Next, a procedure for replacing the conveyance roller 33 will be explained. When performing firing work without transporting the transport roller 33 into the furnace, if glaze or the like adheres to the circumferential surface of the transport roller 33 and the object to be fired cannot be transported smoothly, first stop the firing work once. After stopping, the conveying means 21, 21 consisting of an endless chain are intermittently moved toward either the carry-in side D or the carry-out side E at a low speed that does not cause sudden thermal changes to the conveying roller 33. The conveyance roller 33 that has come out of the furnace due to this intermittent movement is replaced with a new conveyance roller 33 during the period when the intermittent movement is stopped. Since a large number of conveyance rollers are usually replaced, the above-mentioned intermittent movement is repeated.

Further, it is also possible to replace the conveyance roller 33 in parallel with the baking operation without stopping the baking operation. That is, the conveyance means 21, 21 are driven to increase the revolution speed of the conveyance roller 33 to an appropriate speed, and at the same time, the conduction means 39 of the solar device 38 is driven at an appropriate speed to slow down or reverse the rotation of the conveyance roller 33. The conveyance speed of the object to be fired is maintained at a predetermined speed. In this way, after the conveyance roller 33 to be replaced is taken out of the furnace while maintaining the conveyance of the to-be-fired object within the furnace, the conveyance speed of the to-be-fired object being conveyed is kept constant, and gradually Conveying means 2
The conduction means 3 of the solar device 38 while decelerating 1,21
9 increases the rotation speed of the conveying roller 33, and finally stops the conveying means 21, 21.
Next, the solar device 3 rotates the conveyance roller 33.
The transmission means 39 of No. 8 is temporarily stopped, and the conveying roller 33 that has come out of the furnace and should be replaced is replaced.

The roller hearth kiln according to the invention can be modified in various ways. For example, the conveying means 21, 21 in the embodiment shown in FIG. 2 are constructed by stretching endless chains, one on each left and right, over the entire conveyance area from the outside-furnace carry-in side D to the outside-furnace carry-out side E. However, it is not limited to this in any way. Although not shown in the figure, the endless chain tension area is divided as appropriate into a preheating zone, firing zone, and cooling zone along the conveyance direction of the objects to be fired, and one endless chain is stretched in each divided zone on the left and right. Then, the conveying rollers 33 guided to each endless chain pass through the furnace of each division zone to the lower half furnace body 1.
It can also be configured to move below and outside of 7. Furthermore, the pre-heating zone and the cooling zone have the same conveyance mechanism as the conventional one, and the high-temperature firing zone where glaze is likely to adhere to the conveyance roller 33 is provided with a conveying means consisting of an endless chain. Of course, it is also possible to configure the conveyor roller 33 to move within the furnace and below and outside the lower half furnace body 17.

Furthermore, FIGS. 8 and 9 show an embodiment of a roller hearth kiln in which a drying chamber 45 is provided below the furnace body 15.
and a lower heat retaining wall body 47. A conveying roller passage C is formed between the upper heat retaining wall body 46 and the lower heat retaining wall body 47, through which the conveying roller 33 that is sent out from within the furnace body 15 and returns below the furnace body 15 passes. It has been made possible. Further, on the upstream side of the conveyance roller passage C (the rear side of the furnace body 15), a carry-in device 49 for placing the material to be dried, such as a tile base, on the upper surface of the conveyance roller 33 is provided. side (furnace body 15
A discharge device 48 for taking out the dried material is provided on the front side).

As mentioned above, there is a drying room 45 in the roller hearth kiln.
Not only can the drying process and firing process of the tile base in tile manufacturing etc. be performed in parallel, but also the drying process of the tile base can be supplied to the loading side of the furnace body 15 for firing, so production can be accelerated. Efficiency is extremely improved.

Note that if the inside of the drying chamber 45 is heated using the exhaust gas from the furnace body 15, thermal energy can be used effectively, leading to an improvement in yield.

〔Effect of the invention〕

The present invention has the following excellent effects.

The conveyance roller to be replaced can be conveyed out of the furnace by the conveyance means. Therefore, the conveyor rollers can be replaced without reducing the temperature inside the furnace in the slightest, and without applying any heat shock to the rollers. Also, it is possible to save waiting time for reheating the temperature inside the furnace.

By the action of the solar device and the planetary device, the conveyance roller can be guided or stopped without affecting the conveyance state of the object to be fired. Therefore, even when the conveyance roller to be replaced is sent out of the furnace and then the conveyance of the conveyance roller is stopped to perform the replacement work, the conveyance speed of the material to be fired can be kept constant, so that the replacement work and the replacement work can be kept constant. Firing operations can be continued in parallel.

In a conventional roller hearth kiln, the conveyance roller simply rotates at a fixed position in the furnace body. However, since the roller hearth kiln according to the present invention is configured such that the conveying roller is guided inside the furnace and then sent out of the furnace,
At this time, dirt and other conditions on the conveyance roller can be visually observed. That is, it is possible to constantly monitor the condition of the conveyance roller and predict when to replace the conveyance roller, and it is also possible to detect defects in the conveyance roller at an early stage to prevent accidents.

Not only can the conveyance roller be replaced outside the roller hearth kiln, but since the conveyance roller is held by an easy-to-operate chuck means, anyone can replace it in a short time.

Due to the synergistic effect of the effects described above, it becomes possible to quickly replace the conveyance roller, and the operating efficiency of the roller hearth kiln can be dramatically improved.

[Brief explanation of the drawing]

Fig. 1 is a partially omitted cross-sectional view showing the main parts of a conventional roller hearth kiln, Figs. 2 to 10A,
B shows an embodiment of the roller hearth kiln according to the present invention, and FIG. 2 is a sectional view with the middle omitted;
Figure 3 is an enlarged cross-sectional view cut along the line ``--'', Figure 4A is an enlarged cross-sectional view with the middle omitted showing the mounting state of the conveyance roller, Figure B is a partially cutaway right side view of the same, and Figure 5 is the conveyance roller. FIG. 6 is an enlarged cross-sectional view of the main part showing a different mounting state of the solar device, FIG. 6 is a cross-sectional view along the line - - of FIG. 4, FIG.
The figure is a side view with the middle omitted showing another embodiment in which a drying area is provided on the lower side of the furnace body, and FIG. 9 is the same as above.
The line sectional view and FIGS. 10A and 10B are enlarged sectional views showing another embodiment of the conveying roller holding mechanism. 15... Furnace body, 16... Upper half furnace body, 16a...
Furnace ceiling, 16b...Furnace side wall upper half, 17...Lower half furnace body, 17a...Furnace bottom, 17b...Furnace side wall lower half, 20...Transmission mechanism, 21, 51...Transmission Means, 25... Conveyance roller holding mechanism, 26, 27,
63, 64...chucking means, 32...planetary device, 33...transport roller, 38...solar device,
39...Transmission means, 43...Drive device, A...Transport roller passage.

Claims (1)

[Scope of Claims] 1. A lower half furnace body in which a furnace bottom and lower halves of left and right furnace side walls are integrally formed with refractory bricks, etc., and a furnace ceiling and upper halves of left and right furnace side walls are integrally formed with refractory bricks or the like. A furnace body consisting of an upper half furnace body suspended above the lower half furnace body, a conveying roller passage formed between the upper half furnace body and the lower half furnace body, and a conveyor roller passage formed between the upper half furnace body and the lower half furnace body; a conveying means for guiding the conveying roller, which is disposed at substantially the same height as the conveying roller passage on both left and right outer sides and moves synchronously left and right in the longitudinal direction of the furnace body along the conveying roller passage; The left end and the right end are removably held by a conveyance roller holding mechanism comprising chucking means mounted opposite to each other at a predetermined interval in the longitudinal direction, and respective chucking means on the left and right sides of the conveyance roller holding mechanism. and a conveyance roller made of a heat-resistant material, which is guided through the conveyance roller passage in the longitudinal direction of the furnace body in accordance with the left-right synchronous movement of the conveyance means, and whose length dimension between both ends is longer than the width dimension of the furnace body. A roller hearth kiln consisting of a chain sprocket, wherein a planetary device consisting of a chain sprocket is provided near the outside of one of the chucking means of the left and right chucking means or one of the conveyance rollers, and the planetary device comprises a chain sprocket. The device is rotatable around an axis integrally with the chucking means and the conveying roller, and includes a transmission means comprising a chain in differential relation with the planetary device, and a drive for driving the transmission means in the longitudinal direction of the furnace body. A roller hearth kiln characterized in that it is equipped with a solar device consisting of means. 2. The left and right conveying means move along the conveying roller passage at positions approximately at the same height as the conveying roller passage on both the left and right outer sides of the furnace body, and move to a position lower than the furnace bottom of the lower half furnace body. The roller hearth kiln according to claim 1, comprising an endless chain stretched so as to return along the lower half of the furnace side wall.