JPH04320792A - Roller hearth furnace - Google Patents

Abstract

PURPOSE:To prevent the generation of burning variations originated from the right and left imbalance of in-furnace temperature distribution. CONSTITUTION:All or parts of rollers installed inside a furnace are divided into two, namely, divided rollers 3A and 3B in a carrier direction wherein rotatable drive means 6A and 6B are separately installed to each divided roller, say, 3A and 3B.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roller hearth furnace.

0002

2. Description of the Related Art A roller hearth furnace, which is a continuous firing furnace, has a cylindrical furnace body 21 and a large number of conveying rollers 22, . . . arranged in parallel, as shown in FIG.

[0003] The furnace body 21 is made of a heat insulating material, and a heater 23 is built into its inner surface. The roller 22 is operatively connected to a motor 24 through a transmission mechanism such as a chain and a sprocket, and is driven to rotate in one direction by the motor 24 .

[0004] The objects to be fired are housed in shells 25 and stacked in multiple stages on a base plate 26, fed together with the base plate 26 onto rollers 22, and conveyed through the furnace by the rotation of the rollers 22. Along with this transportation, the object to be fired is preheated, heated,
It passes through each cooling zone and is continuously fired into the desired fired product.

[0005] As described above, since continuous firing is performed in the roller hearth furnace, mass production is possible, and the advantages include the ability to set an arbitrary firing profile by appropriately adjusting the rotational speed of the rollers 22 in each part. There is.

[0006]

[Problems to be Solved by the Invention] However, in the roller hearth furnace as described above, the object to be fired is conveyed at a fixed position on the left and right sides while maintaining the posture fed onto the rollers 22, so that the temperature distribution inside the furnace is not uniform. If the temperature is different on the left and right sides in the conveyance direction, the temperature distribution will be affected by the left-right imbalance, and firing will vary depending on the left-right position on the base plate 26.

The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to eliminate variations in firing caused by lateral imbalance of temperature distribution in the furnace.

[0008]

[Means for Solving the Problems] In order to achieve the above-mentioned problems, the present invention provides a roller hearth furnace in which all or part of the rollers in the furnace are divided into left and right divided rollers in the conveying direction, and each divided roller Each of these is provided with a driving means that can separately drive each of them to rotate.

[0009]

[Operation] In the above configuration, when both the left and right divided rollers are rotated at the same speed in the forward direction, the material to be fired loaded on the base plate will maintain its left and right position at a constant position, just like in a conventional roller hearth furnace. However, when the left and right divided rollers are rotated in opposite directions,
The object to be fired, together with the base plate, rotates around the vertical axis almost on the spot, swaps its left and right positions, and is fired in that state.

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be explained below based on an embodiment shown in FIGS. 1 to 3. FIG. 1 is a longitudinal sectional front view of a roller hearth furnace according to an embodiment of the present invention, FIG. 2 is an enlarged longitudinal sectional view of the roller portion thereof, and FIG. 3 is a transverse plan view for explaining the operation.

The roller hearth furnace of this embodiment is basically a cylindrical furnace body 1 with a large number of conveying rollers arranged in parallel inside the furnace body 1, and the furnace body 1 is made of a heat insulating material. This is the same as the conventional example in that the heater 2 is incorporated in the heater 2.

The difference between the roller hearth furnace of this embodiment and the conventional example is that all or part of the conveyance rollers are divided into a pair of left and right divided rollers 3A, 3B along the conveyance direction, and the left and right pair of rollers separates the furnace body. 1 is configured to form a conveying surface extending over the entire width on the left and right sides. The pair of left and right divided rollers 3A and 3B are rotatably supported by a pedestal 5 via a central shaft 4 that passes through the furnace body 1 from side to side. Each of the divided rollers 3A and 3B is provided with a motor 6A and 6B, respectively, as a driving means for rotating the divided rollers separately.
are provided, and each motor 6A, 6B has a sprocket 7,
8 and the corresponding split roller 3A via the chain 9,
It is linked to 3B. Reference numeral 10 indicates a pod that accommodates the object to be fired, and 11 indicates a base plate on which the pod 10 is loaded.

The divided rollers 3A and 3B are hollow rollers made of alumina or mullite, and their structure is symmetrical. Therefore, the structure of the left and right divided rollers 3A will be explained based on FIG. 2. The divided rollers 3A include a cylindrical roller main body 31, several collar portions 32 provided on the outer periphery of the inner end thereof,... It is rotatably attached to the central shaft 4 via ceramic bearings 12, . One end of the roller body 31 protrudes outside the furnace body 1, and a passive sprocket 8 is fixed to the protruding end.

The operation of the above configuration will be explained based on FIG. 3. First, when the left and right divided rollers 3A and 3B are both rotated in the forward direction at the same speed, the objects to be fired loaded on the base plate 11 are transported through the furnace while keeping their left and right positions constant. .

Next, when the left and right dividing rollers 3A and 3B are rotated in opposite directions, the object to be fired, together with the base plate 11, rotates around the vertical axis on the spot as shown by the arrow.
The left and right positions are swapped. Since the base plate 11 is thus rotated in the furnace, it is desirable to form it into a disk shape so that it can rotate smoothly without getting caught. Since the object to be fired is fired with its left and right positions reversed, even if there is a left-right imbalance in the temperature distribution in the furnace, there will be no variation in firing.

[0016]

[Effects of the Invention] As described above, according to the present invention, the left and right positions of the object to be fired can be swapped during firing, and by swapping the left and right positions, problems caused by left and right imbalances in the temperature distribution in the furnace can be changed. It is possible to prevent variations in firing.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional front view of a roller hearth furnace according to an embodiment of the present invention.

FIG. 2 is an enlarged vertical cross-sectional view of the roller portion of the above embodiment.

FIG. 3 is a cross-sectional plan view for explaining the operation of the embodiment.

FIG. 4 is a vertical side view of a conventional roller hearth furnace.

[Explanation of symbols]

1 Furnace body 2 Heater 3A Split roller 3B Same as above 6A motor (drive means) 6B Same as above

Claims (1)

[Claims] Claim 1: All or part of the rollers in the furnace are divided into left and right divided rollers (3A, 3B) in the conveyance direction,
A roller hearth furnace characterized in that each divided roller (3A, 3B) is provided with a driving means (6A, 6B) capable of rotating the divided roller separately.