JPS61184384A - Roller hearth type furnace - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

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 on a hearth.

[Technical background] In roller hearth type furnaces, scale adhering to the surface of the heated object falls off due to vibration during transportation.

Most of it is deposited directly under the roll. If a large amount of scale accumulates in this way, it may deteriorate thermal efficiency or interfere with the rotation of the rolls, so it was necessary to periodically stop operation and have someone enter the furnace to clean the scale. This required a great deal 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 this case, there may not be enough room for people to enter the furnace, making cleaning difficult. Sometimes it happened.

[Object of the Invention] The present invention has been made in view of the above, and is an object of the present invention to facilitate cleaning of the inside of a roller hearth type furnace.

[Means for achieving the object] In order to achieve the object, the roller hearth type furnace of the present invention has a discharge passage formed under the hearth, and a discharge port facing the discharge passage located directly under the roll of the hearth. In addition, the discharge port is provided with a scale receiver that can be opened and closed.

[Example] The roller hearth type furnace shown in this example is called an edge heater that uses a burner to directly heat the edge portion of a material to be heated, which is directly cast into a slab or billet from molten steel by continuous casting equipment (not shown). It is something that 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. There is. The furnace body 3 made of a heat insulating material has supporting legs 4.4...
It is supported on floor 5 at . A plurality of burners 7, 7, . . . are installed on the furnace wall 6 along the furnace length direction.

8 is a flue. Immediately below the hearth 9, there is a discharge passage in the furnace length direction.
At the same time, a discharge port 11 facing the discharge path 1o is opened 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, and the shafts 13a, 1 are connected by the bearings 12, 12...
3b is rotatably supported.

Ceramic fibers 15 are attached to the upper surfaces of the pivots 13a and 13b.
The scale receivers 16a and 16b to which the scales are attached are fixed by welding, and the roll 2
, 2...covers the lower part. 17, 17, . . . are balance weights provided on opposite sides of the scale receivers 16a, 16b with respect to the pivots 13a, 13b. The tip edges 14a and 14b of the scale receivers 16a and 16b are formed in a step shape so that they can match each other and can close the discharge port 11 airtightly. 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, and has one end thereof. is provided with a handle 22 and a bifurcated piece 23 at the other end,
When the operating shaft 18 is advanced, the bifurcated piece 23
radial pin 2/1.a, equated to one end of 13b.
24.

25 is a ratchet mechanism (not shown) for the operation shaft 18
The brake ring 26 is fitted through the brake ring 2.
In order to block the protruding piece 27 on the outer periphery of the channel member 2
The horizontal bar 28 protruding from the horizontal bar 26 and the protruding piece 2
A stopper 30 is supported movably on the bracket 29 for clamping the stopper 7, and 30 represents an operating lever for moving the stopper 28 forward and backward.

In a roller hearth type furnace configured in this way.

During operation, the scale receivers 16a and 16b are closed to prevent outside air from entering. The scale accumulated on the scale receivers 16a, 16b can be discharged to the discharge path 10 by simply opening the scale receivers 16a, 16b in a double-door pattern. To do this, the bifurcated piece 23 of the operating shaft 18 is engaged with the pin 24.24 and the operating lever 30 is engaged with the pin 24.24.
If the stopper 28 is pulled back and the operating shaft 18 can be rotated in the direction of the arrow in FIG.
, 16b opens under its own weight. In addition, scale receivers 16a, 1
6b, the brake ring 25 is previously rotated in the opposite direction to the direction of the arrow in FIG. In this state, the handle 22 is moved to the scale receivers 16a, 1.
Rotate it in the direction that 6b closes. At that time, brake ring 2
The ratchet mechanism of No. 5 works and the scale receivers 16a, 16b
prevents it from returning to the opening direction. For this reason, the operating lever 30
As long as the scale receiver 16 is in the position indicated by the solid line in Figure 5,
a.

16b is maintained in the closed state.

Note that the scale discharged into the discharge passage 10 is collected at the end and discharged to the outside. In order to transport the scale in the discharge path 10 to the outside, a conveyor or a conveyance truck (neither of which is shown) may be provided in the discharge path IO.

[Effects of the invention] Since the scale inside the furnace can be removed very easily, it has a remarkable effect in reducing the labor required for periodic inspections, and also has various features such as being able to be used in furnaces with small internal space. be.

[Brief explanation of drawings]

The drawings show embodiments of the present invention, and FIG. 1 is a longitudinal sectional view, FIG. 2 is an enlarged view of the main part, FIG. 3 is an enlarged cross-sectional view taken along line A-Ag in FIG. 3 is a sectional view taken along the line B-B, and FIG. 5 is a sectional view taken along the line CC in FIG. 1... Heated object, 2... Roll, 3... Furnace body, 9... Hearth, 10... Discharge path, 11...
Outlet, 16a. 16b...Scale receiver. pj

Claims (1)

[Claims] A roller hearth type, characterized in that a discharge passage is formed under the hearth, a discharge port facing the discharge passage is opened at a position directly below the roll of the hearth, and a scale receiver that can be opened and closed is provided at the discharge port. Furnace.