JPH0467106B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a roller hearth type furnace in which an object to be heated is supported and conveyed on a large number of rolls provided in a hearth.

[Technical background]

In a roller hearth type furnace, scale attached to the surface of the heated object falls off due to vibration during transportation.
Most of them are estimated directly under the roll. If a large amount of scale accumulates in this way, it may deteriorate thermal efficiency or interfere with roll rotation, so it was necessary to periodically stop operation and have someone enter the furnace to clean the scale. The work required a lot of effort and time. On the other hand, in recent years, in order to save energy, the space inside the furnace has been narrowed down to the extent that the objects to be heated can pass through, but in such cases, there may not be enough room for people to enter the furnace, making cleaning difficult. Things were also hot.

Also, Japanese Patent Application Laid-Open No. 58-147512, or
Japanese Patent No. 50-102906 discloses a heating furnace in which the hearth is formed in a chevron-shaped or sawtooth shape, and the scale is configured to slide down the inclined surface under its own weight.
However, forming an inclined surface on the hearth in this way has the disadvantage of reducing thermal energy efficiency because the space inside the hearth must be widened, and if the inclination angle is not sufficient, scale will remain. There is a problem.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to facilitate cleaning of the inside of a roller hearth type furnace without unnecessarily increasing the space inside the furnace in order to save energy.

[Means to achieve the purpose]

In order to achieve the object, the roller hearth type furnace of the present invention has a discharge passage formed under the hearth, and at least the same number of discharge ports as the number of rolls, which are located directly below the rolls of the hearth and which face the discharge furnace. It is characterized in that a plate-shaped scale receiver that closes the discharge port is hinged so as to be freely rotatable downward.

〔Example〕

The roller hearth type furnace shown in this embodiment is a so-called edge heater that uses a burner to directly heat the edge portion of a material to be heated, which is cast directly from molten steel into a slab or billet using continuous casting equipment (not shown). It is. Since this furnace has a long overall length, only the middle part is shown as a joint section. In the figure,
1 is a heated object transported in the direction of the arrow, 2, 2, 2
. . . is a number of rolls provided at regular intervals in the conveyance direction, and both ends of the rolls are rotatably supported by bearings (not shown) installed outside the furnace. A furnace body 3 made of a heat insulating material is supported on a floor 5 by support legs 4, 4, . A plurality of burners 7, 7, . . . are installed on the furnace wall 6 along the furnace length direction. 8 is a flue. Directly below the hearth 9, a discharge path 10 in the furnace length direction is formed, and a discharge port 11 facing the discharge path 10 is provided at a position directly below the rolls 2, 2, . . . of the hearth 9. Bearings 12, 12... are suspended from the lower surface of the hearth on both sides of the discharge port.
12... rotatably support the pivots 13a, 13b. The pivots 13a and 13b are provided with a plate-shaped scale receiver 1 with a ceramic fiber 15 attached to the upper surface.
6a and 16b are fixed by welding, respectively, and the scale receivers 16a and 16b are kept substantially horizontal to close the discharge port 11. 17, 17... are pivots 13a, 13b of scale receivers 16a, 16b
It is a balance weight installed on the opposite side of the body. Tip edge 1 of scale receivers 16a, 16b
4a and 14b are formed in step shapes that can match each other, and by keeping the scale receivers 16a and 16b horizontal, the discharge port 11 can be closed airtight. Reference numeral 18 denotes an operating shaft connected to the pivots 13a and 13b, and the operating shaft 18 is rotatably and movably supported by a bearing 19 provided under the furnace wall and a bearing 21 provided in the channel member 20. A handle 22 is provided at one end, and a bifurcated piece 23 is provided at the other end, and when the operating shaft 18 is advanced, the bifurcated piece 23 is fixed to one end of the pivots 13a and 13b.A radial pin 24, 24. 25 is a brake ring fitted onto the operating shaft 18 via a ratchet mechanism (not shown); 26 is a protrusion 27 on the outer periphery of the brake ring 25;
28 is a stopper supported movably on a bracket 29 to clamp the protrusion 27 together with the horizontal bar 26; 30 is a stopper that moves the stopper 28 forward and backward; This shows the control lever that allows you to

In the roller hearth type furnace configured in this manner, the scale receivers 16a and 16b are closed during operation to prevent outside air from entering. Then, by periodically rotating the scale receivers 16a and 16b downward in a double-door pattern, the scale receivers 16a and 16b are rotated downward.
The scale deposited on 16b can be discharged to the discharge path 10. To do this, engage the bifurcated pieces 23 of the operating shaft 18 with the pins 24, 24, and pull the operating lever 30 to retract the stopper 28 so that the operating shaft 18 can rotate in the direction of the arrow in FIG. 16a and 16b hang down almost vertically under their own weight, so the scale receivers 16a and 16b
The scale accumulated on 16b can be almost completely slid down. In addition, the scale receiver 16a,
To close the brake ring 16b, the brake ring 25 is previously rotated in the opposite direction to the direction of the arrow in FIG. In that state, handle 2
2 in the direction in which the scale receivers 16a and 16b close. At this time, the ratchet mechanism of the brake ring 25 acts to prevent the scale receivers 16a, 16b from returning to the opening direction. For this reason, the operating lever 30
As long as the scale receivers 16a and 16b are in the position shown by the solid line in FIG. 5, the closed state of the scale receivers 16a and 16b is maintained.

Note that the scale discharged into the discharge path 10 is collected at the end and discharged to the outside. This discharge passage 1 is used to transport the scale in this discharge passage 10 to the outside.
0 may be provided with a conveyor or a transport vehicle (neither is shown).

〔Effect of the invention〕

In this way, the roller hearth type furnace of the present invention has a scale receiver hinged at the discharge port so that it can be rotated downward, so it is easy to remove the scale accumulated on the scale receiver without anyone entering the furnace. Moreover, it can be almost completely discharged, making maintenance easier. Moreover, by making the scale receiver approximately horizontal and closing the discharge port, the space inside the furnace can be narrowed to the minimum necessary, so there is a remarkable effect that thermal energy efficiency is not impaired.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention; FIG. 1 is a vertical sectional view, FIG. 2 is an enlarged view of the main part, FIG. 3 is an enlarged cross-sectional view taken along line A-A in FIG. 1, and FIG. 5 is a sectional view taken along the line C--C in FIG. 3. FIG. DESCRIPTION OF SYMBOLS 1... Heated object, 2... Roll, 3... Furnace body, 9... Hearth, 10... Discharge path, 11... Discharge port, 16a, 16
b...Scale receiver.

Claims (1)

[Claims] 1. A discharge passage is formed under the hearth, and a number of discharge ports facing the discharge passage are opened at a position directly below the rolls of the hearth, at least as many as the number of rolls, and a plate-shaped scale receiver that closes the discharge ports is placed downward. A roller hearth type furnace characterized by being hinged so that it can rotate freely.