JP4110664B2 - Material input device for rotary hearth furnace - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a material charging device for a rotary hearth furnace for continuously heat-treating a pellet-shaped material.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a rotary hearth furnace equipped with a rotary hearth that rotates in a horizontal plane has been used to heat a pellet-shaped metal material to a high temperature in an atmosphere gas and perform a heat treatment such as reduction. A material conveying device such as a belt conveyor is conventionally provided on the upper part of the rotary hearth so that the heat treatment material is continuously dropped into the furnace.
[0003]
By the way, although the speed of the upper surface of the rotary hearth on which the material rides is different between the inner peripheral part and the outer peripheral part, the conventional rotary hearth type furnace has introduced the material without considering this point. In other words, the material is not uniformly applied to the inner peripheral portion, and the inner peripheral portion is denser and the outer peripheral portion is rougher.
[0004]
[Problems to be solved by the invention]
The present invention provides a material charging apparatus that eliminates the above-mentioned drawbacks of a rotary hearth furnace and that allows materials to be uniformly charged on the rotary hearth and enables uniform heat treatment.
[0005]
[Means for Solving the Problems]
To this end, the rotary hearth furnace material charging device according to the present invention supports a vibrating conveyor capable of transporting pellet-like material on the upper portion of the rotating hearth , and the lower side of the sliding plate horizontally mounted on the vibrating conveyor. The material falling on the rotary hearth from the leading edge of the vibratory conveyor has a larger outer peripheral portion than the inner peripheral portion of the rotary hearth by adjusting the gap with the conveying surface of the vibratory conveyor Further, the supply amount of the material per unit time of the vibration conveyor is set differently in the width direction.
Further, the present invention is characterized in that in the material feeding apparatus, a flow regulating fence is provided on the conveying surface of the vibration conveyor downstream of the sliding plate.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a horizontal sectional plan view of a rotary hearth furnace. A rotary hearth 2 provided in a cylindrical furnace body 1 is rotated at a low speed in the direction of an arrow by a power source (not shown). The pellet-shaped material 3 is conveyed to the vibrating conveyor 5 by the belt conveyor 4 and is put on the rotary hearth 2. Then, while being carried on the rotary hearth 2 and being transported through the furnace, it is reduced by being heated to a high temperature under a reducing atmosphere, and then taken out of the furnace by a material take-out device 6 comprising a screw conveyor. Discharged.
[0007]
The vibrating conveyor 5 according to the present invention, as shown in FIGS. 2 to 6, horizontally supports a flat plate-like vibrating plate 8 whose tip edge 7 is cut obliquely on a base 10 by a coil spring 9, A vibration motor 11 is provided on both side edges of the vibration plate 8, and the vibration plate 8 vibrates by the operation of the vibration motor 11, thereby conveying the pellet-shaped material 3 on the vibration plate 8 in the direction of the arrow. The end 7a of the tip edge 7 on the extension line of one side edge 8a of the diaphragm 8 is located on the inner peripheral part of the rotary hearth 2 and the tip edge 7 on the extension line of the other side edge 8b. The diaphragm 8 is supported so that the end portion 7b of the rotor is located on the outer peripheral portion of the rotary hearth 2. Reference numeral 12 denotes a gate-shaped mounting frame constructed on the diaphragm 8, and a slide plate 13 is fixed to the lower edge of the mounting frame 12 with screws 14. The sliding plate 13 is adjusted such that the lower side 15 is inclined and the gap 16 with the upper surface of the diaphragm 8 is narrower toward the side edge 8a and wider toward the side edge 8b. As shown in FIG. 2, the mounting frame 12 is inclined in a horizontal plane by supporting one end 12a on the side edge 8a side upstream and supporting the other end 12b on the side edge 8b side downstream. It is erected in a shape.
[0008]
Reference numerals 17a to 17f are rectifying fences provided on the surface of the diaphragm 8 downstream of the sliding plate 13 so as to move the material 3 along the longitudinal direction at equal intervals in parallel with the longitudinal direction. 18 is a sieve formed by opening a large number of small holes in a part of the diaphragm 8 upstream of the scraping plate 13, and 19 is a collection hopper provided below the sieve 18. The fine powder mixed in is dropped by the vibration of the diaphragm 8 and falls into the collection hopper 19 from this small hole, and is prevented from being conveyed into the furnace. Reference numeral 20 denotes a drop chute provided at the lower portion of the tip edge 7 of the diaphragm 8 in the furnace. The drop chute is partitioned by a partition plate 21 in the saddle direction so that the material falls straight on the rotary hearth 2. I am trying to get it.
[0009]
In the material feeding device configured as described above, since the material 3 moving on the vibration plate 8 toward the tip edge 7 hits the slide plate 13, only the width of the gap 16 can pass therethrough. The layer of this material gradually increases from the edge 8a toward the side edge 8b. Then, the material 3 moves along the rectifying fences 17a to 17f, so that it moves into the furnace while maintaining this layer thickness, and falls onto the rotary hearth 2 from the leading edge 7. For this reason, the amount of material falling on the rotary hearth per unit time is closer to the end 7b than to the end 7a, and more material is supplied to the outer peripheral portion than the inner peripheral portion of the rotary hearth 2. Become so. For this reason, the supply amount of the material can be freely set to be different in the width direction by adjusting the gap 16 of the sliding plate 13, and the speed difference between the inner peripheral portion and the outer peripheral portion of the rotary hearth 2. The material can be set uniformly on the rotary hearth 2.
[001 0 ]
In this material charging device, the drop of the material falling on the rotary hearth 2 from the tip edge 7 is made smaller than that of the belt conveyor by using a vibrating conveyor as a conveying means for the pellet-shaped material. In addition to being able to reduce the impact when the material falls, it has the advantage of facilitating movement and classification of the material in the width direction by the vibrating conveyor.
[001 1 ]
【The invention's effect】
As described above, the material charging device for the rotary hearth furnace according to the present invention is such that the material falling on the rotary hearth from the front edge of the vibration conveyor has a larger outer peripheral portion than the inner peripheral portion of the rotary hearth. Since the supply amount of the material per unit time of the vibratory conveyor is set differently in the width direction, the material can be uniformly fed onto the rotary hearth, which has the beneficial effect of enabling uniform heat treatment. is there.
[Brief description of the drawings]
FIG. 1 is a horizontal sectional plan view showing an embodiment of a rotary hearth furnace according to the present invention.
FIG. 2 is an enlarged plan view of a main part of the material input device in FIG. 1;
3 is a cross-sectional view taken along line AA in FIG.
4 is a cross-sectional view taken along the line BB of FIG. 1. FIG. 5 is a cross-sectional view taken along the line CC of the material feeding device of FIG.
6 is a cross-sectional view taken along the line DD of the material input device in FIG. 2;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Furnace 2 Rotating hearth 3 Material 5 Vibrating conveyor 7 Tip edge 8 Vibrating plate 11 Vibrating motor 13 Sliding plate 15 Lower side 16 Gap 17a-17f Rectification fence

Claims (2)

A sliding plate is horizontally mounted on a vibrating conveyor capable of transporting pellet-shaped material, and the gap between the sliding plate and the conveying surface of the vibrating conveyor is narrow near one side edge of the vibrating conveyor and the other side edge. The lower edge of the sliding plate is inclined with respect to the conveying surface of the vibrating conveyor so as to be wider at the side, and the end of the leading edge of the vibrating conveyor on the extended line of the side edge with a narrow gap is the rotary hearth The vibratory conveyor is placed on the outer periphery of the rotary hearth so that the end of the tip edge of the vibratory conveyor is located on the extension of the side edge with a wide gap. By supporting the upper portion of the rotary hearth, the amount of pellet-like material falling on the rotary hearth from the front edge of the vibrating conveyor is less than the inner peripheral portion of the rotary hearth. A material input device for a rotary hearth furnace characterized in that it is increased in number .   The material charging device for a rotary hearth furnace according to claim 1, wherein a flow straightening fence is provided on a conveying surface of the vibration conveyor downstream of the slide plate.

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