JPH07294152A - Protector for sand seal plate in carriage type kiln - Google Patents

Abstract

PURPOSE:To prevent the oxidation and deformation of sand seal plates having lower ends suspended in sand particles with which grooves provided along the side walls of a furnace casing are filled in order to avoid high temperature gas on an upper surface from flowing down to be lost to the lower surface side of a carriage by providing a duct on the side wall of the furnace caging for feeding cooling air from exhaust nozzles. CONSTITUTION:Grooves 16, which correspond to parts just below right and left side surfaces of the frame 8 of a carriage 7, are respectively formed. The respective grooves 16 are filled with sand particles s. Sand seal plates 17 made of a steel plate are suspended and fixed to the right and left side surfaces of the frame 8 of the carriage 7. The lower ends of the sand seal plates 17 are inserted into the sand particles s with which the grooves 16 are filled. A duct 20 formed with a steel square pipe which closes a back surface in the longitudinal direction is attached along corners extending from the lower ends of the side walls 1a of steel plates 15 forming the grooves 16. A plurarity of exhaust nozzles 21 are formed in one line on the surfaces corresponding to the sand seal plates 17 and through holes 22 are opened at positions corresponding to those of the exhaust nozzles 21 on the steel plates 15 forming the grooves 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for protecting a sand seal plate provided on a truck in a truck type firing furnace in order to prevent hot gas on the upper surface of the truck from flowing out to the lower surface side.

[0002]

2. Description of the Related Art In a trolley-type shuttle furnace, a trolley containing a material to be fired is run from outside the furnace on a rail laid down and carried into the furnace, and the trolley is burned by a combustion flame from a burner provided on the side wall of the furnace body. The upper part of the trolley is heated to sinter the object to be fired, and then the dolly is carried out of the furnace. If hot gas on the upper surface of the truck flows out to the lower surface during firing, not only will the rails, wheels, or bearings be exposed to high temperatures, which will significantly lower the durability, but also heat the lower surface of the truck that is not involved in firing. As a result, the thermal efficiency decreases.

Therefore, a refractory heat insulator is provided on the frame of the truck to prevent heat conduction from the upper surface to the lower surface, and both side surfaces of the heat insulator and the side wall of the furnace body facing the heat insulator are mutually opposed. By forming a narrow gap that bends in the vertical direction between the concavo-convex surfaces that match, in addition to suppressing the outflow of high-temperature gas from the upper surface to the lower surface of the bogie, a groove provided along the bottom of the side wall of the furnace body The inside of the sand grains is filled with sand grains, and the lower ends of the sand seal plates provided on both sides of the frame of the truck are inserted into the sand grains so that the lower side surface of the truck and the lower surface of the truck are blocked. Sand seals are commonly used.

[0004]

By the way, the above-mentioned sand seal plate is formed of a steel plate, and the sand seal plate itself is oxidized or deformed by being exposed to high temperature gas. There is a risk that the function may not be achieved satisfactorily, the sand seal plate may come into contact with the groove, hinder the traveling of the bogie, and damage the groove.

[0005]

The present invention has been completed in order to solve the above-mentioned problems, and the invention of claim 1 is a furnace in which a truck carrying an object to be fired is run on an orbit. It is carried into the body and the upper part of the trolley is heated to sinter the object to be fired, and the lower end of the sand seal plate hung on the side of the trolley is filled in the groove provided along the side wall of the furnace body. A sand seal plate protection device for a truck-type firing furnace, which is designed to prevent hot gas on the upper surface of the truck from flowing out to the lower surface of the truck by inserting it into the sand grains.
The side wall of the furnace body is provided with a duct for cooling air having a jet port opening toward the sand seal plate.

According to a second aspect of the present invention, in the first aspect, the duct is formed by using a reinforcing pipe material provided on a side wall of the furnace body.

According to a third aspect of the present invention, in the structure of the first or second aspect, a control means for controlling the flow rate of the cooling air flowing through the duct in accordance with the temperature in the furnace is provided.

[0008]

According to the invention of claim 1, when the cooling air is circulated in the duct, the cooling air is blown from the jet port toward the sand seal plate, and the sand seal plate is maintained at a low temperature. This prevents its oxidation and deformation. As a result, the sealing function can be achieved for a long period of time, and it is possible to prevent the traveling of the trolley and damage to the groove in advance.

According to the second aspect of the present invention, when the pipe material for reinforcing the furnace body is provided at the position corresponding to the sand seal plate, it can be used as a duct as it is by opening the ejection port in the pipe material. It can be handled at low cost.

According to the third aspect of the present invention, the cooling air is not circulated immediately after the start of the firing, but the temperature in the furnace which adversely affects the sand seal plate is adversely affected by the control means. If the cooling air is made to flow, the consumption of the cooling air can be suppressed to the necessary minimum, and the running cost can be reduced.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In FIGS. 1 and 2, reference numeral 1 is a furnace body of a shuttle furnace, and a door 2 is installed at a doorway opened at the front so that the door 2 can be opened and closed. The furnace body 1 and the door 2 are made of refractory brick or ceramic fiber. It is formed by covering a refractory material such as a steel plate outer shell. On the left and right side walls 1a of the furnace body 1,
A plurality of burners 3 are attached and the furnace body 1
A rail 5 is laid on the inner bottom surface so as to extend from the entrance to the outside of the furnace.

The dolly 7 has a structure in which a refractory heat insulating body 9 is placed on the upper surface of a steel frame 8, and wheels 11 are supported by bearings 10 projecting from the lower surface of the frame 8 for heat insulation. The article to be fired x is loaded on the body 9 through columns or the like (not shown), travels along the rails 5, and is carried into and out of the furnace body 1.

The side surface of the heat insulator 9 of the carriage 7 and the side wall 1a of the furnace body 1 facing the heat insulator 9 are formed with concave and convex surfaces which are aligned with each other, and a narrow gap 13 bent in the vertical direction is formed therebetween. Further, from the lower edges of the inner surfaces of the left and right side walls 1a of the furnace body 1, the steel plate 15 of the outer shell covering the lower surface of the side wall 1a is formed.
Is bent downward to extend, and the extended end is bent inward and then upward twice at a right angle, so that each sidewall 1a is bent.
Grooves 16 are formed along the lower edge of the inner surface side of the bogie 7 directly below the left and right side surfaces of the frame 8 of the bogie 7, and each of the grooves 16 is filled with sand grains s. A sand seal plate 17 made of a steel plate is hung down and fixed to the left and right side surfaces of the above, and the lower end thereof is inserted into the sand grains s filled in the groove 16.

The above is a known structure, and particularly in the present embodiment, as shown in FIG. 3, along the corners of the portion extending from the lower edge of the side wall 1a of the steel plate 15 forming the groove 16 described above. , A duct 20 made of a steel rectangular pipe having a closed inner surface in the length direction is attached, and a plurality of ejection ports are provided on the surface of the duct 20 corresponding to the sand seal plate 17 as shown in FIG. 21 are formed side by side in a line, and the through holes 22 are opened at positions corresponding to the ejection ports 21 of the steel plate 15 forming the groove 16. The open end of the duct 20 is connected to a supply source of cooling air (not shown).

This embodiment has the above-mentioned structure. When the truck 7 loaded with the material x to be fired is carried into the furnace along the rails 5, the door 2 is closed and the burner 3 is ignited, The upper part of the truck 7 is heated by the combustion flame to burn the object x to be fired, and after the firing is completed, the door 2 is opened and the truck 7 is carried out of the furnace.

During the firing, the heat insulator 9 prevents heat conduction from the upper surface to the lower surface of the carriage 7, and the narrow gap 1 between the heat insulator 8 and the side wall 1a of the furnace body 1 is bent in the vertical direction.
3 is configured, in addition to suppressing the outflow of high-temperature gas from the upper surface to the lower surface of the carriage 7, the sand seal plate 17 blocks the lower side surface of the carriage 7 from the lower surface of the carriage 7, As a result, the lower surface side of the truck 7 is prevented from being exposed to high temperatures, the durability of the rail 5, the wheel 11, the bearing 10 and the like is prevented from being lowered, and the thermal efficiency is also prevented from being lowered.

In the meantime, a part of the high temperature gas passing through the gap 13 may hit the steel sheet sand seal plate 17 and be exposed to a high temperature, but if cooling air is supplied to the duct 20 at the same time, Cooling air is blown from the jet port 21 toward the sand seal plate 17 through the through hole 22 of the steel plate 15 forming the groove 16, and the sand seal plate 17 is maintained at a low temperature to prevent its oxidation and deformation. To be done. As a result, the sealing function can be achieved for a long period of time, and the sand seal plate 17 is prevented from coming into contact with the groove 16 to hinder the traveling of the carriage 7 or damage the groove 16.

Depending on the furnace, a square pipe may be attached to the side wall 1a of the furnace body 1 or the groove 16 to reinforce the groove 16 at the position where the duct 20 is provided in the above embodiment. Only by forming the jet port on the surface corresponding to the sand seal plate 17 and the through hole on the steel plate 15 forming the groove 16, the duct can be directly used as the cooling air duct, and the cost can be reduced.

Further, between the duct 20 and the supply source of the cooling air, a control means for controlling the supply amount of the cooling air corresponding to the temperature inside the furnace is provided, and the cooling air is circulated immediately after the start of firing. However, if the cooling air is made to flow after observing the rise in the furnace temperature that adversely affects the sand seal plate 17, the consumption of the cooling air is suppressed to the necessary minimum and the running cost is reduced. Reduction is achieved.

Further, the present invention can be applied to a type in which a trolley runs on other tracks such as a group of rollers, and is not limited to a single type, but a continuous trolley type firing furnace such as a tunnel furnace. Can be similarly applied to.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an embodiment of the present invention.

FIG. 2 is a partially cutaway vertical sectional view thereof.

FIG. 3 is an enlarged cross-sectional view showing details of a duct arrangement portion.

[Explanation of symbols]

1: Furnace body 1a: Side wall (of furnace body 1) 3: Burner 5:
Rail 7: Bogie 11: Wheel 15: Steel plate 16: Groove 17: Sand seal plate 20: Duct 21: Jet port 22: Passage x: Burned material s: Sand grain

Claims (3)

[Claims] 1. A trolley on which a material to be fired is run on an orbit to be loaded into a furnace body, the upper side of the trolley is heated to calculate the material to be fired, and the pendant is provided on a side surface of the trolley. By inserting the lower end of the sand seal plate into the sand grains filled in the groove provided along the side wall of the furnace body, the hot gas on the upper surface of the truck is prevented from flowing out to the lower surface side of the truck. In the protection device for the sand seal plate of the truck type firing furnace, the side wall of the furnace body is provided with a duct for cooling air having an ejection port opening toward the sand seal plate. Protective device for sand seal plate in truck type firing furnace. 2. The protection of the sand seal plate in the truck type firing furnace according to claim 1, wherein the duct is formed by using a reinforcing pipe material provided on a side wall of the furnace body. apparatus. 3. The sand in the truck type firing furnace according to claim 1 or 2, further comprising control means for controlling the flow rate of the cooling air flowing through the duct in accordance with the temperature inside the furnace. Seal plate protector.