JPS6245471B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to improving the thermal efficiency of roller hearth kilns.

[Conventional Structure and Problems Therewith] As shown in FIG. 6, a conventional roller hearth kiln consists of a tunnel-shaped furnace body 31 integrally formed of refractory bricks or the like, and conveyance rollers 32, 32, . . . . Each conveyance roller 32 is inserted into an insertion hole bored at an appropriate interval in both walls of the furnace body 31, and is rotatable around its own axis. Arranged to be immovable. The furnace body 31 includes a preheating zone E and a firing zone F.
and a cooling zone G, and burners 33,
33... are provided. Further, the furnace body 31 cools the high-temperature objects 34, 34, etc. while moving a large amount of cooling air injected into the terminal end of the cooling zone G toward the firing zone F, thereby reducing the high temperature. The cooled cooling air is discharged to the outside of the furnace from an appropriate position near the starting end of the cooling zone G, and burners 33, 3 disposed in the firing zone F are discharged.
The combustion exhaust gas of 3... is moved inside the furnace toward the pre-heating zone E to recover the exhaust heat of the combustion exhaust gas, and then the combustion exhaust gas, which has become low in temperature, is discharged from an appropriate location in the pre-heating zone E to the outside of the furnace. It has been done. However, the roller hearth kiln has a drawback that thermal efficiency is extremely low because a large amount of high-temperature cooling air is discharged outside the furnace.

[Object of the Invention] The purpose of the present invention is to provide a roller hearth kiln with high thermal efficiency in order to solve the above-mentioned drawbacks. This invention relates to an improvement of a roller hearth kiln equipped with a conveyor roll capable of rotating and revolving, which was proposed in Japanese Patent Application No. 59-241384.

[Structure of the Invention] The gist of the roller hearth kiln according to the present invention is as follows:
On both left and right outer sides of the furnace body, which is divided into a lower half and an upper half, with a conveyance gap having a height that does not interfere with the conveyance of the conveyance rollers described later, and is approximately the same as the conveyance gap. one endless chain on each left and right stretched so as to move in height along the furnace body; chucking means attached to each of the endless chains at regular intervals and gripping both ends of the conveyance roller;
A planetary device consisting of a chain sprocket formed on the chucking means attached to either the left or right endless chain among the chucking means, and a planetary device consisting of a chain sprocket formed on the chucking means attached to either the left or right endless chain, and at least the entire longitudinal outside area of the furnace body in the circumferential circuit of the endless chain. A roller hearth kiln comprising a solar device arranged in the furnace body and having a second chain that meshes with the planetary device, the endless chain configured to rotate the conveyor rollers from the output side to the input side of the furnace main body. The second chain of the solar device is driven such that the conveying surface of the conveying roller rotates at a higher speed than the revolution speed of the endless chain from the loading side to the unloading side of the furnace main body. It is to be done.

With this configuration, the conveyor rollers, which revolve from the carry-out side to the carry-in side of the furnace body as the endless chain revolves, cool the high-temperature objects to be fired while recovering heat while passing through the cooling zone. After heating up to almost the firing temperature and storing heat, it plays the role of a so-called heat storage/radiator that radiates heat while passing through the low-temperature area of the firing zone and the preheating zone to heat the low-temperature object to be fired. It is possible to reduce the amount of cooling air brought into the cooling zone and to reduce the heating load on the burner, making it possible to improve the thermal efficiency of the entire roller hearth kiln.

[Description of Embodiments] The present invention will be described below based on the embodiments shown in FIGS. 1 to 5.

In the following description, "front" means the left side in FIGS. 1 and 5, and "rear" means the right side in these figures. In addition, "left" means the left side in Figures 2 and 3, and "right"
refers to the right side in these figures.

As shown in FIGS. 1 and 2, the firing furnace main body 1 is divided into several sections in the front-rear direction, which is the direction in which the objects to be fired are transported. Each section is
An upper half furnace body 3 which integrally comprises a furnace ceiling portion 3a and left and right furnace side wall upper half portions 3b, 3b made of refractory bricks or the like.
and a lower half furnace body 2 which is made of refractory bricks or the like and integrally constitutes a furnace bottom part 2a and lower half parts 2b of left and right furnace side walls, and this upper half furnace body 3 and lower half furnace body 2
A conveyance roller 4 made of porcelain or the like, whose length between both ends is longer than the width of the lower half furnace body 2, is provided between the A gap H (hereinafter referred to as conveyance roller path A) is set to a height dimension that does not obstruct the conveyance roller path. As shown in FIG. 2, the lower half furnace body 2 is placed on a lower cross beam 18a of a strongly framed frame 18. On the other hand, the upper half of the furnace body 3 has the frame 1 above it.
A hanging frame 19 is suspended from the upper cross beam b of 8 so that the height can be freely adjusted.

Conveying means 5, 5 are arranged on the left and right outer sides of the firing furnace main body 1 along the front and back direction. As shown in FIG. 1, each transmission means 5 includes an endless chain 6, reversing chain sprockets 7, 7...
Chain guide rail 8 (see Figure 3) attached to frame 18c and chain drive motor 9
The left and right endless chains 6, 6 are configured to be driven synchronously from the conveyance side C toward the carry-in side B at an appropriate revolution movement speed _V1 . As shown in FIGS. 2 and 3A and 3B, a pair of chucking means 10 and 11 are attached to the transmission means 5, 5 facing each other at an appropriate interval P (see FIG. 5) along the front-rear direction. For example, a plurality of sets of conveying means holding mechanisms are attached for every P=25 to 50 mm). The right chucking means 10 includes bearings 1 attached to the left and right link plates 6a, 6a of the endless chain 6, as shown in FIG. 3A.
2, 12, a support shaft 13 pivotally supported by the left and right bearings 12, 12, a guide roller 14 rotatably fitted onto the support shaft 13 between the left and right bearings 12, 12, and an inner side of the support shaft 13. A chuck head 15 is slidably fitted to the end of the chuck head, a compression coil spring 17 is fitted between the chuck head 15 and a retaining ring 16 fitted onto the support shaft 13, and presses the chuck head 15 inward; The planetary device 20 includes a chain sprocket fitted near the outer end of the shaft 13. Further, the left tracking means 11 is as shown in FIG. 3B.
Bearings 12, 12 attached to the left and right link plates 6a, 6a of the endless chain 6, and a support shaft 13' supported by the left and right bearings 12, 12.
and a guide roller 14 rotatably fitted onto the support shaft 13' between the left and right bearings 12, 12,
The chuck head 15' is attached to the inner end of the support shaft 13'. Further, in at least the entire area on both longitudinal sides of the firing furnace main body 1 in the circumferential circuit of each of the endless chains 6, 6, a third
As shown in FIGS. A, B and FIG. 5, the guide rollers 14, 14 of the left and right chucking means 10, 11
Roller guide rails 21, 21 for guiding the chain are laid parallel to the chain guide rail 8, so that the support shafts 13, 13' of the chucking means 10, 11 maintain a horizontal state without wobbling.

As shown in FIGS. 1 and 2, the conveyance rollers 4, 4, which are detachably attached to the respective sets of chucking means 10, 11, move around the firing furnace main body as the endless chains 6, 6 move. It revolves in the transport roller passage A extending in the longitudinal direction of 1 from the carry-out side C to the carry-in side B, and after exiting the furnace on the carry-in side B, passes under the lower half furnace body 2 in the opposite direction, It moves back into the conveyance roller path A from the discharge side C again.
As shown in FIGS. 3A and 3B and FIG. 4, seal plates 22 are fitted as necessary near the left and right ends of the two adjacent front and rear conveyance rollers 4, 4, respectively. The amount of air outside the furnace flowing into the furnace is reduced, and the radiant heat inside the furnace is prevented from leaking out of the furnace from the conveying roller passage A. The seal plates 22, 22, . has been done.

A pair of solar devices 23 that apply a rotational reaction force to the planetary devices 20, 20, etc. in order to rotate the conveyance rollers 4, 4, etc. are shown in FIGS. 1, 3A, B, and 5. As shown, the planetary device 20
A second endless chain 24 is stretched so as to mesh with a chain sprocket, and a guide rail 25 (a third
(see Figures A and 5) and an inverted chain sprocket 2 on which a second endless chain 24 is stretched.
A transmission means 27 consisting of a gear box 27a, a line shaft 27b, etc. that transmits driving force to
and a drive source 28 (first
(see figure), so that the conveying surfaces of the conveying rollers 4, 4 _, . It is composed of The second endless chain 24, together with the planetary device 20 and the solar device 23, forms a kind of differential rotation mechanism (same principle as a differential gear).
Due to the conveyance speed determined by this differential rotation mechanism, the objects to be fired placed on the conveyance rollers 4, 4... are conveyed from the input side B to the output side C in the firing furnace main body 1 at a conveyance speed of V ₃ (V ₃ =V ₂ -V ₁ ).

[Function] Next, the function of the roller hearth kiln according to the present invention will be explained. As shown in Figure 1 A and B, the loading side B
Objects to be fired, such as tile substrates (not shown), placed on the conveyance rollers 4, 4... are carried in by the differential speed between the revolution of the endless chains 6, 6 and the rotation of the conveyance rollers 4, 4... The material is guided from the side B toward the delivery side C at the transport speed V ₃ , is fired while passing through the heated furnace, and is delivered to the delivery side C.

As the endless chains 6, 6 revolve, the low-temperature conveyance rollers 4, 4, which have revolved from outside the furnace on the delivery side C into the firing furnace main body 1, pass through the cooling zone G shown in FIG. Second, the heat of the object to be fired is absorbed by contact heat transfer with the object to be fired at a high temperature, thereby cooling the object to be fired. Further, when the conveyance rollers 4, 4... reach the starting end area of the cooling zone G or the ending area of the firing zone F due to their revolving movement, the temperature rises to approximately the firing temperature due to heat absorption from the object to be fired, and the heat storage ends. do. Continuing, when the conveyance rollers 4, 4... pass through the highest temperature region of the firing zone F and proceed to the low temperature region of the firing zone F and the preheating zone E, they are exposed to contact heat transfer with the low temperature object to be fired. Dissipates heat while heating the baked product. Finally, when the conveyance rollers 4, 4, .

In addition, if glaze or the like adheres to the surfaces of the conveyance rollers 4, 4, etc. and the objects to be fired cannot be conveyed smoothly, the endless chains 6, 6 are intermittently moved to the carry-in side B or the carry-out side C. The conveyance roller 4 that has come out of the furnace due to intermittent movement is replaced with a new one while the endless chains 6, 6 are stopped.

[Effects of the Invention] The roller hearth kiln according to the present invention has the following excellent effects.

The conveyance rollers that revolve around the firing furnace body from the carry-out side to the carry-in side cool the high-temperature to-be-fired objects while passing through the cooling zone, recover heat, raise the temperature to approximately the firing temperature, and store heat. After that, it plays the role of a so-called heat storage/radiator that radiates heat while passing through the low temperature area of the firing zone and the preheating zone and heats the low temperature objects to be fired. It is possible to significantly reduce the amount of cooling air required compared to conventional roller hearth kilns, and it is also possible to reduce the heating load on the burners installed in the firing zone and preheating zone, improving the overall thermal efficiency of the roller hearth kiln. can be improved.

Thermal efficiency can be improved because the conveyance rollers can be replaced without reducing the temperature inside the furnace, especially the temperature inside the furnace in the high-temperature firing zone.

Since the conveyance roller replacement work is easy and can be completed within an extremely short time, it is possible to minimize the heat loss released from the furnace walls of the firing furnace body when replacing the conveyance rollers. Thermal efficiency can be improved.

Due to the synergistic effects described above, the overall thermal efficiency can be dramatically improved compared to conventional roller hearth kilns.

[Brief explanation of the drawing]

1 to 5 show an embodiment of the roller hearth kiln according to the present invention, in which FIG. 1 is a side view showing the whole with the middle omitted, and FIG. 2 is a cut along the line - in FIG. 1. 3A is an enlarged sectional view showing the right chucking means, FIG. 3B is an enlarged sectional view showing the left chucking means, and FIG. 4 is an enlarged side view showing the seal structure on both outsides of the firing furnace. , FIG. 5 is an enlarged side view showing the solar device with the middle omitted, and FIG. 6 is a side sectional view schematically explaining a conventional roller hearth kiln. DESCRIPTION OF SYMBOLS 1... Firing furnace body, 2... Lower half furnace body, 3... Upper half furnace body, 4... Conveyance roller, 6... Endless chain, 10, 11... Chucking means, 20
... Planetary device, 23 ... Solar device, 24 ... Second chain.

Claims (1)

[Claims] 1 On both left and right outer sides of the furnace body, which is divided into a lower half and an upper half, with a conveyance gap having a height that does not impede the conveyance of the conveyance rollers described below, approximately approximately the same as the conveyance gap. one endless chain on each left and right stretched so as to move along the furnace body at the same height; and chucking means attached at regular intervals to each of the endless chains for gripping both ends of the conveyance roller. , a planetary device consisting of a chain sprocket formed on the chucking means attached to one of the left and right endless chains of the chucking means, and at least the entire lengthwise outer area of the furnace body of the circumferential circuit of the endless chain. A roller hearth kiln comprising a solar device disposed in the furnace and a solar device having a second chain that meshes with the planetary device, the endless chain has a roller hearth kiln in which the conveying rollers revolve around the furnace body from the carry-out side to the carry-in side. The second chain of the solar device is driven such that the conveying surface of the conveying roller rotates at a higher speed than the revolution speed of the endless chain from the loading side to the unloading side of the furnace main body. A roller hearth kiln characterized by being driven.