JPS613990A - Discharger for scale in walking beam type heating 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 [Industrial Application Field 1] The present invention includes a scale trough below the hearth, and uses a walking beam to move the scales falling into the scale trough to the charging side with a scraper. This invention relates to a scale ejecting device for a walking beam heating furnace that scrapes out scale.

[Prior art 1] In the hearth of a walking beam type heating furnace, an opening is provided to ensure the operating range of the walking beam skid post. ) is generally used to seal the opening with water.

Oxidized scale generated during heating of the steel material falls and accumulates in this scale trough. Such a scale ejection device uses the rectangular movement of a walking beam.
It has been proposed that the scale in the scale trough is sequentially transferred to the charging side using a scraper, and recovered to the outside by a discharge means such as a packet conveyor provided at the charging end of the scale trough.

Conventional external discharge devices of this kind of scale, for example, the inclined trough method disclosed in Japanese Patent Application Laid-open No. 55-105190, have complicated structures, are large in size, and require a large installation space. However, there was a maintenance problem that required frequent scraper maintenance.

In addition, in the case of a divided walking beam type heating furnace in which the walking beam is divided into multiple parts in the furnace length direction, the above-mentioned inclined trough method can be installed in each walking beam zone by providing a driving device for each walking beam. This has the disadvantage that it is difficult to install, and it is also troublesome to install and maintain.

[Object of the Invention] The object of the present invention is to provide a scale wandering structure for a walking beam heating furnace that has a very simple structure, has a high scale evacuation capacity, and can be installed compactly.
It's about doing.

[Configuration 1 of the Invention For this reason, the present invention provides a walking system that includes a scale trough below the hearth opening, and scrapes the scales falling into the scale trough toward the charging side with a scroller according to the operation of the walking beam. In a beam-type heating furnace, a scale discharge passage with a closed cross section that communicates with the bottom of the charging side end of each scale trough and is inclined in the width direction of the furnace is provided, and a scale discharge passage that extends in the inclined direction of the scale discharge passage is provided. It is constructed by disposing a jet nozzle that generates a swirling flow in a scale discharge passage.

That is, in the present invention, the scale scraped by the scraper into the inclined scale discharge passage is drawn into the swirling flow generated by the jet nozzle and carried in the scale discharge direction. Since such a swirling flow is generated sequentially along the scale discharge passage, the scale is guided to the downstream end of the scale discharge passage by the swirling flow generated by each jet nozzle and is exposed to the outside. It will be discharged and collected.

[Effect of the invention 1] According to the present invention, it is only necessary to provide the scale trough with a scale discharge passage that is inclined in the width direction of the furnace, and to dispose a jet nozzle that generates a swirling flow in this scale discharge passage. Not only can it be made extremely simple and compact, but also the swirling flow can lift up the scale deposited in the passageway, entrain it in the swirling flow, and move it in the discharge direction, ensuring a high scale discharge capacity. can do.

[Embodiment 1] Hereinafter, embodiments of the present invention will be specifically described with reference to the accompanying drawings.

As shown in FIG. 2, the hearth 2 of the walking beam heating furnace 1 is provided with a hearth opening 3, and the scale generated during heating of the steel material 4 is spread from this hearth opening 3 in the furnace width direction. The scale falls into a plurality of scale troughs 5 in the furnace length direction.

The scale that has fallen into the scale trough 5 is removed by scrapers 6.6 provided at a predetermined pitch along the scale trough 5.
．． ...and scrape it out to the steel material charging side of the heating furnace 1. These scrapers 6I6. ... are fixed to the hearth 2, and when the scale trough 5 is moved in a rectangular manner together with the walking beam 7 by the driving mechanism 8 of the walking beam 7, the scale trough 5 is moved at the bottom of the scale trough 5 in the feeding stroke of the rectangular movement. Scrape out the accumulated scale to the charging side.

Incidentally, since a conventionally known drive mechanism 8 can be used, a detailed explanation will be omitted.

As shown in FIG. 1, the charging side end of each scale trough 5 is communicated via a hopper 9 with a scale discharge passage 10 consisting of an inclined pipe with a circular cross section, and the scraper 6.6.・
The scale scraped out by... is dropped from the hopper 9 into the scale discharge passage 10.

As shown in FIG. 1), the scale discharge passage 10 is formed as a slope with a closed section inclined at a relatively gentle angle in the furnace width direction, and the lower end of the scale discharge passage 10 is formed by a scale sluice 11. It is bent downward at the top, and a discharge valve 12 is provided at the bent end, which opens when a predetermined amount of scale accumulates.

The scale discharge passage 10 includes a jet nozzle 13°13.
．． ... will be temporarily established. These jet nozzles 13.13°・
As shown in FIGS. 3 and 4, they are installed so as to face the tangential direction of the wall surface of the scale discharge passage 10 and to be inclined at an appropriate angle in the inclination direction. Such jet nozzles 13, 13. When high-pressure 7 lashing water is supplied to each jet nozzle 13 via the water supply piping 14 due to the installation of..., the flushing water flows through the scale discharge passage 1.
0, a swirling flow S is generated in the direction of inclination. This swirling flow S has the effect of lifting up the scale accumulated at the bottom of the scale discharge passage 10 and sending it downward in the inclined direction,
This swirling flow S is generated in a continuous manner by the 7 lashing water from each jet nozzle 13 provided at appropriate intervals in the scale discharge passage 10, so that the scales on the upper end side of the scale discharge passage 10 are also generated. It will be transported downstream smoothly.

This scale is discharged from the scale discharge passage 1.
When a predetermined amount of scale is deposited in the scale, the water supply valve 15 and the discharge valve 12 are simultaneously opened to discharge the scale into the scale sluice 11 along with the trough seal water and the 7 lashing water in the swirling flow S. In this case, the water level in the scale trough 5 will not fluctuate if the water supply amount is made approximately equal to the drainage amount.

When the scale discharge is completed, the water supply valve 15.
The discharge valve 12 is closed to collect scale again.

The scale discharged into the scale sluice 11 is swept away to a scale bit (not shown) by the tiger 7 sealing water and 7 lashing water discharged at the same time and is recovered.

In the above embodiment, a case was described in which the scale discharge passage was inclined in the width direction of the furnace so that it sloped downward on one side wall of the furnace, but the scale discharge passage inclined in the width direction of the furnace was
As shown in FIG. 5, the scale discharge passage may be of a type consisting of two systems that slope downward toward both furnace side walls, and as shown in FIG. A jet nozzle 13.13° that generates a swirling flow in the direction of inclination in the scale discharge passage 10, as shown in 6 or above, may be of the type consisting of two systems each descending and sloping toward the center of the furnace width. If the scale is placed at an appropriate location, the scale accumulated at the bottom of the scale discharge passage 10 can be discharged in a swirling flow, and the scale can be discharged and recovered without the need to install large-scale equipment such as a packet conveyor. It can be done smoothly and efficiently.

[Brief explanation of the drawing]

Fig. 1 is an explanatory cross-sectional view of the main part in the furnace width direction showing a scale discharge structure according to an embodiment of the present invention, Fig. 2 is an explanatory cross-sectional view of the main part in the furnace length direction, and Figs. 3 and 4 are jet flow FIGS. 5 and 6 are cross-sectional explanatory views of main parts showing a nozzle mounting structure, and FIGS. 5 and 6 are cross-sectional explanatory views of main parts showing other embodiments of the present invention. 1... Walking beam type heating furnace, 2... Hearth,
3... Hearth opening, 5... Scale trough, 6.6. ..., 6... Scraper, 7... Walking beam, 10... Scale discharge passage, 13.13. ..., f3... jet nozzle. Patent applicant Kobe Steel Chugai Roko Kogyo Co., Ltd.

Claims (1)

[Claims] (1) In a walking beam heating furnace, a scale trough is provided below the hearth opening, and the scale that has fallen into the scale trough is scraped out to the charging side with a scraper according to the operation of the walking beam. A scale discharge passage with a closed section inclined in the width direction of the furnace is provided with communication at the bottom of the charging side end, and a jet nozzle that generates a swirling flow along the passage wall surface in the direction of inclination of the scale discharge passage is used to discharge scale. A scale discharge device for a walking beam heating furnace, characterized in that it is disposed in a passageway.