JPS6049832B2 - Continuous drying and firing furnaces in ceramic product manufacturing plants - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a continuous drying and firing furnace in a manufacturing plant for ceramic products such as roof tiles, bricks, and pottery.

Traditionally, the drying and firing of raw materials in ceramic product manufacturing plants was usually done in two-story manufacturing plants, with a tunnel firing furnace installed on the first floor and a tunnel drying furnace installed on the second floor. The exhaust heat from the furnace was introduced into the drying furnace through an air duct using an exhaust fan.

Therefore, heat dissipates during the transfer of waste heat, and the efficiency of recovering waste heat from the firing furnace to the drying furnace cannot necessarily be said to be good. In addition, because the inside of the drying oven used a system in which materials were transported by stacking drying pallets in multiple stages on a drying cart, most of the entrances and exits of the drying oven had to be left open, resulting in large heat dissipation and the need to keep the drying oven itself warm. It was inefficient. 1st
In view of the above, an object of the invention is to provide a continuous drying/calcining furnace in a ceramic product manufacturing plant that can improve the efficiency of exhaust heat recovery from the firing furnace to the drying furnace and save energy. .

In addition to the above objects, the second object of the invention is to provide a continuous drying and firing furnace for use in a manufacturing platform for ceramic products, which can improve the heat retention efficiency of the drying furnace itself and further save energy.

To achieve the above-mentioned object, a first invention provides a method in which a firing furnace and a drying furnace are integrally formed with the ceiling of the former as a floor of the latter, and the firing furnace and the drying furnace are connected to each other through a metal plate constituting the ceiling of the cooling zone of the firing furnace. This is achieved by a structure that radiates heat directly to the drying oven, and the second invention, in addition to the above-mentioned structure of the first invention, provides a multi-stage stacking/multi-stage unloading device for pallets at the loading and unloading parts of the drying furnace, respectively. This is achieved by a configuration that allows pallets to be carried in and out one by one from the lower openings of the entrance and exit doors into the drying oven. Hereinafter, one embodiment of the present invention will be described based on illustrated examples.

Here, the explanation will be given using tiles as an example of a ceramic product, but the invention is not limited to this.

As shown in Figures 1 to 5, continuous drying and
The firing furnace 1 is tunnel-shaped, and has a firing furnace 2 and a drying furnace 3 integrally formed with the ceiling of the former serving as the floor of the latter.

The drying/firing furnace 1 has a frame made of a plurality of steel materials 6, an inner wall made of a heat insulating material 4, and the ceiling of the firing furnace 2 is made of refractory material (refractory bricks) in the cooling zone A and the firing zone B. etc.) 5, and the cooling zone C has a heat dissipation structure made of heat-resistant metal plates (heat-resistant steel plates, etc.). More specifically, as shown in the figure, this heat dissipation structure has butterfly valves 8 attached to upper openings formed at predetermined intervals in the longitudinal direction of a heat dissipation box 7 made of a heat-resistant steel plate, making it possible to adjust the amount of heat dissipation. ing. In addition, in the preheating zone A, the combustion gas exhaust duct 9 in the firing furnace 2 is guided to the ceiling of the firing furnace 2, that is, above the floor of the drying furnace 3, as shown in FIG. By configuring the upper surface of the plate 10, the retained heat of the firing gas can be effectively utilized. In addition,
The white tiles (objects to be fired) are transported within the firing furnace 2 by sequentially pushing out the firing cart 11 on which they are placed using the pusher 12. Further, in the firing furnace 2, 13 is an exhaust gas fan, and 14 is a burner. On the other hand, inside the drying oven 3,
In the illustrated example, the multistage conveyance means for the pallet 15 has a frame made of steel material 6, and roller conveyors 16 are arranged in two rows in multiple stages.

Further, multi-stage stacking/multi-stage unloading devices 17 and 18 are provided at the loading/unloading portions within the furnace. The multi-stage stacking and multi-stage unloading devices 17 and 18 are, for example, endless chain conveyors that are erected and are intermittently raised and lowered one pallet stage at a time. For this reason, if an opening through which one pallet 15 can pass is provided below the entrance and exit doors 19 and 20 when carrying it into and out of the furnace, it can remain closed at all times. In addition, the pallet 15 in the drying oven 3
The transportation is carried out by the first pusher 21 for loading and conveying, and the first
The second pusher 22, which is provided above the pusher 21 and simultaneously pushes out the second and higher pallets, sequentially sends out the pallets. Furthermore, stirring fans 23 are provided on both inner walls of the drying oven 3 at appropriate intervals, and an exhaust duct 24 is provided on the ceiling on the carry-in side. In addition, K in the illustration indicates either cloth, white background, or fired tile. Next, the manner in which the continuous drying and firing furnace is used will be explained by taking as an example the case where it is applied to a tile manufacturing plant as shown in FIGS. 6 and 7.

The viscosity for roof tiles is kneaded in a kneading machine 25, then cut into predetermined lengths by a cutting machine 26, and pressed in a forming machine 30 to form raw roof tiles.

A plurality of the fabric tiles are placed on the pallet 15 by the fabric tile transfer machine 27 and are sequentially transferred from the first conveyor 28 to the ascending elevator 29 to the second conveyor 31 to the entrance position of the drying oven 3. transported. The pallets 15 carrying these fabric tiles are inserted one by one from the lower gap of the entrance door 19, and are sequentially transferred upward by the multi-tier stacking device 17 and stacked up the required number of tiers. 22
A plurality of pallets 15 are simultaneously pushed onto the roller conveyor 16.

On this roller conveyor 16, the pallets 15 are sequentially conveyed in a thick-core manner and are conveyed to a position of a multi-stage unloading device 18. The pallets 15 are sequentially lowered to the lowest stage by the multi-stage lowering device 18, and are sequentially placed onto the three conveyors 32 by a pulling device (not shown). In this way, the fabric tiles are pallet 1
As the tiles are conveyed through the drying furnace 3 by 5, they become white tiles.The tiles are dried from the firing furnace 2 by directly utilizing the exhaust heat from the firing furnace 2 via a heat dissipation box 7 made of a heat-resistant metal plate. The exhaust heat recovery efficiency to the furnace 3 is good. Furthermore, if the entrance/exit doors 19 and 20 are provided with openings at the bottom into which one pallet 15 can be inserted, they can be kept closed at all times, reducing heat dissipation and improving the thermal efficiency of the drying oven 3 itself. . The white tiles on the pallet 15 reach the white tiles removal machine 36 via the third conveyor 32, the fourth conveyor 33, the fifth conveyor 34, and the descending elevator 35.

The pallet 15 and the white tiles are separated by the white tiles removal machine 36,
The white tiles are sent to a tile transfer machine 39 via a hanger conveyor 37 and a glaze applicator 38. On the other hand, the pallet 15 is transferred to the first conveyor 2
8, the raw tile is transported to the position of the raw tile transfer machine 27, and a new raw tile is placed thereon. The white tiles that have reached the tile transfer machine 39 are placed on the baking cart 11 on the cart track 41.

This baking cart 11 is moved along a moving track 44 by a chain drive or the like.
It is transferred onto the trolley moving vehicle 43 located above, and the trolley moving vehicle 43
It is conveyed to the entrance position of the firing furnace 2 via. The firing cart 11 that has reached the entrance position is pushed into the firing furnace 2 by the pusher 12, and is sequentially pushed out and transferred in a core-like manner, passing through the pre-heating zone A, cooling zone B, and cooling zone C, where the white tiles are fired and become fired tiles. This fired tile is placed on the firing cart 11 and is transported onto the cart track 45 via the cart moving vehicle 43. The tiles are transferred to a tile stacking machine 47 and then transferred to a shipping position 49 in a bundled state via a binding machine 48. Since the continuous drying/firing furnace in the ceramic product manufacturing plant of the present invention has the above-described configuration, it produces the following effects.

In the first invention, since heat is directly transferred from the firing furnace to the drying furnace, there is no heat dissipation during the heat transfer, and the efficiency of exhaust heat recovery can be improved, resulting in energy savings.

In the second invention, in addition to the above-mentioned effects, since pallets are taken in and out of the drying oven through the lower opening for one pallet, there is no large heat loss caused by opening or closing the door almost entirely, unlike in the conventional method. It is possible to improve the heat retention efficiency of the drying oven itself and save energy.

[Brief explanation of the drawing]

The diagrams show one embodiment of the present invention, and FIG. 1 is a vertical sectional view of a continuous drying/calcination furnace, FIG. 2 is an enlarged sectional view taken along the line ■-■ in FIG. 1, and FIG. Figure 4 is an enlarged cross-sectional view along line ■-■ of Figure 1, Figure 5 is a detailed front view of the roller conveyor, Figure 6 is a schematic plan layout of the tile manufacturing plant, FIG. 7 is a schematic view taken along the line ■-■ in FIG. 6. DESCRIPTION OF SYMBOLS 1...Drying/calcination furnace, 2...Calcination furnace, 3...Drying oven, 4...Insulating material, 5...Refractory material, 6...Steel material,
7... Heat dissipation box, 11... Baking cart, 15... Pallet, 16... Roller conveyor, 17... Multi-tier stacking device, 18... Multi-tier unloading device, 19... Entrance door ,2
0: Exit door, 21: 1st pusher, 22: 2nd
Pusher, A...preparation zone, B...firing zone, C...
Cooling zone, K...Dough, white background, fired tiles.

Claims (1)

[Scope of Claims] 1. A furnace in a manufacturing plant for ceramic products in which a pre-heating zone, a firing zone, and a cooling zone are continuously formed is divided into an upper and lower two-stage structure of a firing furnace and a drying furnace by a partition plate, Continuous drying in a ceramic product manufacturing plant characterized in that the partition plate has an insulating structure made of refractories in the preheating zone and firing zone, and a heat dissipation structure made of heat-resistant metal plates in the cooling zone.・
Firing furnace. 2. In a furnace in a manufacturing plant for ceramic products in which a preheating zone, a firing zone, and a cooling zone are continuously formed, a diaphragm is used to divide the calcination furnace and drying furnace into an upper and lower two-stage structure, and the diaphragm is In the tropical zone, a heat insulating structure made of refractories is used in the firing zone, and a heat dissipation structure made of heat resistant metal plates is provided in the cooling zone. A ceramic product characterized in that multi-stage stacking and multi-stage unloading devices are installed at the loading and unloading parts of the drying oven, allowing drying pallets to be loaded and unloaded one by one into and out of the drying furnace from the lower openings of the entrance and exit doors. Continuous drying and firing furnaces in manufacturing plants.