JPH0618213Y2 - Roof tile dryer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an improvement of a roof tile drying device capable of efficiently drying roof tiles before firing in a short time.

(Prior Art) As a roof tile drying device, for example, Japanese Utility Model Publication No. Sho 63-35337.
As shown in the publication, a roof tile transfer device is provided in the center of the drying furnace, and hot air blowing and suction fans are provided on both side walls of the furnace to blow hot air onto the roof tile to be transferred from the surface of the roof tile. It is known that water is evaporated.

However, when hot hot air is blown onto the surface of the roof tile, there is a problem that only the surface layer of the roof tile is dried and easily cut or cracked, so that rapid drying cannot be performed.
Conventionally, there is a drawback that it takes a long time of 30 hours to dry a roof tile having a moisture content of 20% until the moisture content becomes 2%.

(Problems to be Solved by the Invention) The present invention solves the above-mentioned conventional drawbacks, and can dry a roof tile in a much shorter time than before without causing surface breakage or cracks. It was completed for the purpose of.

(Means for Solving the Problems) The present invention, which has been made to achieve the above object, has a furnace having a roof tile transfer device at the center thereof, and a partition plate protruding inward from both side walls of the furnace body to lengthen the furnace. It is characterized in that it is divided into a number of sections in each direction, and a hot air circulation device that forms a circulating air flow in the vertical direction is attached to the ceiling of each section, and infrared heaters are attached to both side walls of every other section. is there.

(Embodiment) Next, the present invention will be described in detail with reference to the illustrated embodiment.

In the figure, (1) is a tunnel-shaped furnace body, and (2) is a roof tile transfer device provided at the center of the furnace body (1). The roof tile transfer device (2) of the embodiment includes a rail (3) and a carriage (4), and tiles having a water content of about 20% are loaded in multiple stages on the carriage (4) and then from the entrance of the furnace body (1). The roof tile transfer device has a structure that transfers it toward the exit.
The structure of (2) can be appropriately changed, such as a conveyor type.

The interior of the furnace body (1) is divided into a number of compartments in the longitudinal direction of the furnace by partition plates (6) projecting inwardly from both side walls (5). (7) is a hot air circulation device attached to the ceiling of each compartment, and a fan (9) provided inside the casing (8) creates a vertical circulating air flow inside each compartment as shown in the figure. Form. Also, both side walls of every other compartment
A large number of infrared heaters (10) are attached to (5), and they are heated so that the temperature inside the compartment is about 70 ° C. However, the temperature inside the compartment where the infrared heater (10) is not installed is maintained at around 40 ° C. Reference numeral (1) is an exhaust port appropriately provided in the ceiling portion of the furnace body (1), and in the illustrated embodiment, it is provided in the circulation portion of each section, but it is not necessarily limited to this.

In order to clearly separate the descending flow and the ascending flow of the circulating air flow in each section, a partition wall (12) shown in Fig. 3 may be provided in the furnace body. In this case, the infrared heater (10) does not have the partition wall (12). ) Is placed inside.

(Operation) In the roof tile drying device of the present invention thus constructed, the roof tiles are loaded on the carriage (4) of the roof tile transfer device (2), and the infrared heater (10) is moved while moving inside the furnace body (1). Radiation and hot air circulation equipment (7)
It is the same as the conventional one that the drying is performed by the convection due to. However, in the present invention, the furnace body
The inside of (1) is divided into a number of compartments by partition plates (6) that project inwardly from both side walls (5), and every other compartment is a high-temperature compartment with an infrared heater (10) attached. Therefore, the roof tiles pass through the low temperature section and the high temperature section alternately and continuously. Infrared heater when passing through this high temperature section
The roof tile surface rises in temperature rapidly and is dried by being exposed to the circulating hot air of about 70 ° C while receiving the radiation of (10). However, since the temperature rise in the interior is delayed, the temperature difference between the surface and the interior becomes large, and moisture diffuses toward the surface. However, when the surface is dried to some extent, a boundary layer is formed on the surface, which conversely hinders the evaporation of water. Then, when the roof tile enters the low temperature zone adjacent to it, a wind of about 40 ° C blows on the roof tile surface and removes the boundary layer of the roof tile, so that the water diffusion action inside the roof tile is promoted and Moisture transfer takes place, and the water that has moved to the surface is rapidly removed from the surface of the roof tile in the next high-temperature section. As described above, according to the present invention, the strong water removal action from the roof tile surface and the moisture diffusion action inside the roof tile are alternately repeated.
The time required to dry the inside of the roof tile is much shorter than that of a conventional apparatus that continuously performs drying at a constant temperature. Moreover, according to the present invention, the temperature rise and drying of the surface in the high temperature section, the uniform temperature distribution inside the roof tile and the diffusion of water are repeated alternately in the low temperature compartment, so that the roof surface is covered with a large amount of water inside. Only the chisel is not dried rapidly, so that the surface of the tile does not crack or break during the drying.

As a result, the time required to dry roof tiles with a water content of 20% until the water content of 2% is 3 hours from the conventional 30 hours.
It has become possible to reduce the time significantly.

In addition, in the first half where a large amount of water evaporates, the opening of the exhaust port (11) is increased to promote the discharge of water vapor, and in the latter half where the evaporation amount decreases, the opening is reduced to prevent the dissipation of heat and improve the thermal efficiency. It is preferable to improve. If an infrared heater (10) with a resistance heating element such as a nichrome wire embedded inside a ceramic plate is used, it is resistant to moisture and has a large heat capacity, making it difficult to cool and reducing the temperature fluctuation range against the set temperature. It is convenient to carry out uniform drying.

(Effect of the Invention) As described above, the present invention can dry the roof tile in a much shorter time than the conventional one without causing cracks or breaks on the surface, and can streamline the roof tile manufacturing process. It is effective. Therefore, the present invention has an extremely large practical value as a roof tile drying device that solves the conventional drawbacks.

[Brief description of drawings]

FIG. 1 is a horizontal sectional view showing an embodiment of the present invention, FIG. 2 is a vertical sectional view thereof, and FIG. 3 is a vertical sectional view showing another embodiment. (1): furnace body, (2): roof tile transfer device, (5): both side walls, (6): partition plate, (7): hot air circulation device, (10): infrared heater.

Claims (1)

[Scope of utility model registration request] 1. A large number of compartments in the longitudinal direction of the furnace by partition plates (6) projecting inwardly from both side walls (5) inside the furnace body (1) equipped with a roof tile transfer device (2) In addition to installing a hot air circulation device (7) that forms a circulating air flow in the vertical direction on the ceiling of each compartment, an infrared heater (10) is installed on both side walls (5) of every other compartment. Roof tile dryer.