JPH0282087A - Calcining facility - Google Patents

Abstract

PURPOSE:To reduce the fluctuations of a pressure and a temperature in a calcining furnace by a method wherein pressure chambers are formed continuously at the outside of an outlet door while a fan, provided in the pressure chamber, is operated to increase the pressure in the pressure chambers. CONSTITUTION:The roof of a pressure chamber 3 is formed so as to have upwardly projected conical configuration and an industrial fan 6 is provided on the upper side wall of the pressure chamber 3. When the fan 6 is driven, the pressure chamber 3 may be loaded with air and a pressure in the pressure chamber 3 may be increased. The inside of the pressure chamber 3 is held at a considerable pressure by the operation of the fan 5 when a product, calcined through a preheating zone, a calcining zone and a cooling zone in a calcining furnace 1, is transferred into the pressure chamber 3 after opening an outlet door 7 whereby the pressure and the temperature in the calcining furnace 1 will never be changed when the outlet door 2 is opened and wall surfaces in the calcining furnace 1 as well as the products and the like in the same furnace 1 will never be affected badly.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an improvement in firing equipment equipped with a firing furnace capable of firing ceramic molded bodies such as sanitary ware.

(Prior art and its problems) Conventionally, in the process of firing sanitary ware, etc., after forming and drying sanitary ware, etc., a large number of sanitary ware, etc. are loaded onto a trolley, this trolley is carried into a firing furnace, and the trolley is moved inside the firing furnace. In the process of continuously moving the temperature from the inlet side to the outlet side, preheating, firing, and cooling are performed in the firing furnace, and the product is taken out from the outlet side.

Conventional firing furnaces are open to the outside air on the exit side, so when you open the door on the exit side of the firing furnace when taking out the cart from the firing furnace, outside air flows into the firing furnace, which prevents the firing process. The pressure and temperature inside the furnace fluctuate, causing expansion and contraction of the refractory bricks and joints inside the firing furnace, which can cause cracks and peeling, as well as uneven firing and changes in gloss of the product. There were problems such as the occurrence of defective products.

(Means for Solving the Problems) The present invention has been devised in view of the above-mentioned conventional problems, and is a method for performing firing without causing pressure and temperature changes in the firing furnace when taking out the product from the firing furnace. The purpose is to provide equipment, and its gist is that it is a firing equipment equipped with a firing furnace that fires molded objects such as ceramics while being loaded on a trolley and moving them from the entrance side to the exit side. A pressure chamber connected to the firing furnace is formed outside the exit door installed at the exit.
A fan capable of filling the pressure chamber with air is installed in the pressure chamber, and the pressure chamber is configured to reduce fluctuations in pressure and temperature inside the kiln when the cart is carried into the pressure chamber from the kiln. be.

(Function) A pressure chamber is formed continuously outside the exit door of the kiln, and a fan is installed in this pressure chamber, and by operating the fan, the pressure in the pressure chamber can be increased. When the exit door of the kiln is opened and the product is taken out, the trolley is taken out into the pressure chamber, so there is no direct communication between the kiln and the outside air, and pressure and temperature changes within the pressure chamber are buffered. , fluctuations in pressure and temperature inside the firing furnace are significantly reduced.

(Example) Embodiments of the present invention will be described below based on the drawings.

FIG. 1 shows a plan cross-sectional view of the firing equipment of this example.
It is formed as, inside it, bogie rail lb,
lb has been completely laid, and the trolley can be placed on these trolley rails lb, lb and moved along the trolley rails 1b, lb from the entrance side to the exit side of the firing furnace 1. A large number of dried ceramic molded bodies are loaded on a trolley in advance, and the trolley is carried into the firing furnace 1 and gradually moved to the exit side, whereby the molded bodies are fired therein and made into a product. Burners, fans, etc. are installed inside the firing furnace 1, and these are controlled at an appropriate temperature by a control means.The inlet side is configured as a residual zone, the central area is configured as a high-temperature firing zone, and the outlet side is configured as a cooling zone. It is configured as a belt, and a constant amount of air is normally flowed together with the combustion gas from the cooling zone on the outlet side to the firing zone and then to the extra zone on the inlet side.

In this example, a perpendicular pressure chamber 3 is formed continuously on the outside of an exit door 2 which is openable and closable on the exit side of the firing furnace 1, and the firing furnace 1 is placed in this pressure chamber 3. It is possible to take out the finished products by the trolley. Further, a door 4 is installed on the exit side of the pressure chamber 3 so as to be openable and closable, and a carry-out line 5 is formed outside the door 4.

As shown in FIG. 2, the roof of the pressure chamber 3 is formed in the shape of a cone projecting upward, and an industrial electric fan 6 is installed on the upper side wall of the roof. By driving the electric fan 6, the pressure chamber 3 can be filled with air, and the pressure inside the pressure chamber 3 can be increased.

In such a structure, when the fired product passes through the residual zone, the firing zone, and the cooling zone in the firing furnace 1 and is carried into the pressure chamber 3 after the exit door 2 is opened, the inside of the pressure chamber 3 is equipped with an electric fan 6. Since the pressure is maintained at a considerable level by the operation of the furnace, even when the exit door 2 is opened, there is no change in the pressure or temperature inside the firing furnace 1, and there is no adverse effect on the walls and products inside the firing furnace 1. It has no effect.

That is, conventionally, when the exit door 2 of the firing furnace 1 is opened and the cart is taken out, the pressure and temperature within the firing furnace 1 fluctuate, and therefore the fireproof wall 1a forming the inner wall surface of the firing furnace 1 changes. Expansion and contraction may occur, resulting in loss of durability.
In addition, peeling of the refractories, insulation materials, and joints inside the firing furnace 1 may occur, and the outside air flowing into the firing furnace 1 may cause the molded bodies stacked in the center and lower rows of the cart to peel off. There are problems such as the temperature decreases and the baking deteriorates, and the sand seal and iron powder on the bottom side are rolled up and attached to the stacked molded products, resulting in defective products. This caused various problems such as cracks, uneven color of the glaze, and changes in gloss.

In this example, a pressure chamber 3 is provided outside the outlet door 2, and a fan 6 that can fill the pressure chamber 3 with air is installed, so that even when the outlet s2 is opened, the pressure inside the kiln 1 increases. , the temperature fluctuation is reduced, and the measured value in actual operation is
The pressure fluctuation is in the range of 0.3 to 5 aAq, and
Regarding temperature changes, change values of about 5 to 20°C are recorded.

The range of fluctuations in pressure and temperature of this degree is extremely small compared to the conventional fluctuation values, and therefore, the adverse effect on the inside of the firing furnace 1 as in the conventional method is extremely reduced.

In addition, in order to further improve the function of the pressure chamber 3, one or more partition walls that can be opened and closed may be installed in the pressure chamber 3, so that when the exit door 2 is opened, the pressure chamber 3 and the inside of the firing furnace 1 are closed. pressure and temperature fluctuations can be further reduced. In addition, the capacity of the electric fan 6 can be changed as appropriate depending on the internal volume of the pressure chamber 3, and by filling the pressure chamber 3 with air, the pressure inside the pressure chamber can be changed to the pressure at the outlet side of the firing furnace 1. It is acceptable as long as it can be maintained at approximately the same level as . In this case, the door 4 of the pressure chamber 3 is closed, and after the exit door 2 of the firing furnace 1 is closed, the door 4 is opened and the cart is transported from the pressure chamber 3 to the carry-out line 5. It is something that can be discussed.

(Effects of the Invention) The firing equipment of the present invention is a firing equipment equipped with a firing furnace that fires a molded object such as ceramics while being loaded on a cart and moving it from an inlet side to an exit side. A pressure chamber connected to the firing furnace is formed outside the exit door provided in the furnace, and an electric fan capable of filling air into the pressure chamber is installed in the pressure chamber.
The construction is such that when the trolley is carried into the pressure chamber from the firing furnace, fluctuations in pressure and temperature inside the firing furnace are reduced, and the pressure chamber is filled with air by a fan, so the exit door is opened. Even when the furnace is heated, fluctuations in pressure and temperature inside the firing furnace are extremely reduced, and adverse effects on refractories such as refractory bricks and joint materials inside the firing furnace can be avoided.
It is possible to prevent the rapid temperature drop of the fired product due to the inflow of cold air into the firing furnace, and to avoid rolling up of iron powder, etc.
The occurrence of defective products can be effectively prevented. Moreover, it has the effect of making it possible to obtain a good fired product without adversely affecting the color unevenness of the glaze or the change in glossiness.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a cross-sectional plan view showing the arrangement of a firing furnace and a pressure chamber, and FIG. 2 is a perspective view of the main parts of FIG. 1. 1... Firing furnace 2... Exit door 3... Pressure chamber 4... Door 6... Electric fan

Claims (1)

[Claims] This firing equipment is equipped with a firing furnace that fires molded objects such as ceramics while being loaded on a trolley while being moved from the entrance side to the exit side, and the firing furnace and the outside of the exit door provided at the exit of the firing furnace are installed. A continuous pressure chamber is formed, and a fan capable of filling air into the pressure chamber is installed, so that when the cart is carried into the pressure chamber from the firing furnace, fluctuations in pressure and temperature in the firing furnace are prevented. Firing equipment characterized in that it is configured to reduce the amount.