US1717828A - Blast-furnace top - Google Patents

Description

\ June 1s, 1929.

BAKER vBLAST FURNACE TOP 2 Sheets-Sheet l Filed April 21, 1926 June 18, 1929. D. BAKER 1,717,828 BLAST FURNACE TOP Filed April 21, 1926 2 Sheets-Sheet 2 Eil Patented June 18, 1929.

UNITED YSTATES DAVID BAKER, OF SWARTHMORE, PENNSYLVANIA.

BLAST-renuncia Tor.

Application filed April 21, 1926. Serial No. 103,569.

The invention relates to blast furnace top. The object is to provide improvements 1n means for `mechanically charging blast furnaces in order to facilitate the operation and also to secure a more even and uniform distribution of raw materials within the furnace.

It is a well known fact that mechanical filling in general use to-day, does not give as perfect distribution of raw materials in the blast furnace that intelligent hand filling O'ave. D lt is the purpose of the present invention to duplicate or simulate hand lilling by mechanical means, to do away with the usual center bell rods, and to secure the even distribution heretofore obtained.

Referring to the drawings which illustrate merely by way of example suitable means for effecting my invention Fig. 1 is a side elevation.

Fig. 2 is a front elevation partly in Section.

Fig. 3 is an elevation in part section of the chute turning cylinder.

Similar numerals refer to similar parts throughout the several views.'

The upper part of the furnace is normally closed by the main bell 6 seating against the lip-ring 5 of the main hopper. This main bell 6 is connected by the link 7 to the beam S, supported by the rods 9, which are operated to raise and lower' the bell 6 as required. By this means the central rod, which is usually required to support the bell, is dispensed with.

At the top of the furnace is rotatably mounted the chute 10. This chute is given rotative movement by means of the pinion 11 cooperating with the rack or annular gear 12 which is attached to the chute by means of the bracket 13. The chut-e 10 has a substantial depth and is provided with the substantially V-shaped discharge mouth 14, as shown in Fig. 1.

Above t-he chute 10, is provided the slide plate 15, adapted to form a gas seal for the top of the furnace, when the bell 6 is lowered into the open position. The slide plate 15 is operated by the rod 16 connected to piston 17, operating in the cylinder v18, supplied, in the usual way, with water under pressure or with compressed elastic fluid, under the usual controls.

Above the chute 10 is provided the hopper 19, into which the skip dump 2O delivers ma terial.; the hopper 19 delivering to the chute 10.

The chute 10 is given step by step rotative movement by means, as above stated, of pinion 11 on shaft 21 having a ratchet wheel 22 cooperating with a pawl This pawl 23 is mounted on a sleeve 24 carrying a pinion 25. The pinion 25 cooperates with a rack 26 secured to the two pistonsv 27 operating in the cylinder 2S supplied in the usual way with water` under pressure or with compressed elastic fluid. The purpose of the pawl and ratchet means for communicating movement to the chute 10, is to provide the rotative movement of chute 1() in one direction only.

The chute `is actuated to travel through an arc slightly more or less than 90 degrees, before each skip load is dumped, thereby causing a continual progression of the dumping points around the bell 6.

The plate 15 ispreferably mounted on a frame or carriage 29, provided with wheels 30, running on the tracks 31.

The chute 10 is provided with a suitable bearing, as at 32. This should preferably be of anti-friction type.

The mouth 14 of the chute 10 substantially V-shaped for the following purpose lt is essential that the materials passing through the chute shall follow closely the center line of the chute; otherwise the proper distribution in the main hopper and on the bell 6 will not be obtained. i

It has been found that, with certain chutes of the prior' art having the mouth relatively wide and shallow, the initial velocity of the ore leaving the skip, caused the coarser materials to go through the chute to one side of its center' line, when the chute .was turned into any position with its discharge between the point of dump of the skip and the point opposite thereto.

This action practically nullilied the distribution aimed at, because a greater proportion of lump always found itself on the side of the center line of the chute opposite that of the dump of the skip, while the greater proportion of fines were deposited on the other side of said center line.

The chute is specially designed to deliver the various materials to the point aimed at by the center line of the chute.

In dimensions, the chute is relatively deep, somewhat to control the direction of the discharge of materials to the bell 6, thereby counteracting the velocity of the materials charge mouth, which tends strongly to de-.l

liver the materials along-the center Aline of the chute.

The small bell commonly used as a gasV seal, when the main bell is open, is dispensed with, thereby eliminating the bell supporting rod Which usually extends through the hopperI or chute. This Vrod tends to block or interfere with the even flow of material through the chute.

The gas seal, Which `is necessary When the main bell 6 is open, isobtained by the slide plate 15 which is automatically closed by the piston 17, operating in cylinder 18, When the bell 6 is open, and automatically opened When the bell 6 is closed.

In operation, the skip 2O dumps a load into the hopper 19. The gas seal or slide plate 15 being open, the load passes through the distributing chute 10, to the main bell 6. lllhile the skip is making another trip, the distributing chute 10 is turned a definite number of degrees, as described and the second skip load is placed at the next position on the bell 6. This operation is repeated until preferably four skip loads have been deposited around the bell 6.

The gas seal or slide plate 15 is then closed and the bell 6 lowered, allowing the material to slide oil1 into the furnace.

The bell 6 is closed after a certain interval, the slide plate 15 is opened, and before the skip 20 gets to the top of chute 10 the chute is turned, and thekcycle repeated; the bell 6 being opened after every four dumps of the skip.

Each rotative movement of the chute 1s preferably through a definite arc, either slightly more or less than 90", but never exactly 90, in order thatthe four dumping points shall gradually move around 'the top, While holding the same angularity with respect toreach other.

The operation of the slide plate 15, above described, is merely by Way of example; it will be obvious that the slide plate may be .operated in accordance With any of the methods in practice for furnace charging.

`Vlhat I claim 1s 1. In combination With a blast'furnace top for closing saine, a beam Within the hopper1 'a link pivotally connected tothe beam and also pivotally connected to the bell at its apex, and supporting rods pivotally connected to the ends ofthe beam.

,greatest diameter, having its discharge opening'in a plane at-subst-antially the same 1nclination tothe vertical plane as that of the opposite Wall, and having its loWer margins meeting at anangle to form a V, in order to direct the dischargeV of material uniformly and substantially along the center line of` the chute.

3. In combination 'with a blast furnace top having a main receiving hopper vand a revolving chute'delivering thereto, a gas seal for the top of the chute, comprising a flatv plate adapted to cover and uncover the entire opening of the chute, a plate supporting carriage .having supporting Wheels and cooperating tracks, and means 'for reciprocating the carriage.

VDAVID BAKER.

having a main receiving hopper anda bell

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