US1905679A - Apparatus for charging furnaces - Google Patents

Description

April 25, 1933- A. J. BOYNTON ET AL 1,905,679

APPARATUS FOR CHARGING FURNACES Filed Jan. 23, 1932 3 Sheets-Sheet l Y la April 25, 1933- A. J. BOYNTON El AL 1,905,679

APPARATUS FOR CHARGING FURNACES Filed Jan. 25, 1952 s Sheets-Sheet 2 April 25, 1933. J BOYNTON ET AL 1,905,679

APPARATUS FOR CHARGING FURNACES Filed Jan. 23, 1952 :5 sheetesheet a Patented Apr. 25 193:)

UNITED STATES PATENT; optics ARTHUR J. BOYNTON AND rAUL zmn amna. osc IcAso, rumors, Assrsuoas'ro H. A. BRASSER'I & COMPANY, or CHICAGO, ILLIN'o'IsA coaPonA'rroN or rumors APPARATUS ma CHARGING FunnAcns Application filed January 23, 1932. Serial'No. 588,310.

This invention relates to a new and improved apparatus for charging furnaces;v and more particularly to apparatus for charging blastfurnaces or the like whereby the distri bution of the charged material may be controlled.

In the usual type of blast furnace or the like the charge is permitted to flow into the top of the furnace from a charging hopper by lowering a bell closing the bottom of the hopper. This causes the charge to flow over the bell and against the outer walls of the fur nace. In furnaces having bells of usual proportions this results in a depression under the bell and in an uneven distribution of the material. The fine material normally remains adjacent the furnace wall while the coarser material rolls down'into the depression under the bell. This segregation of material results in having areas in the furnace of different gas permeability so that the gases tend to channel rather than tofiow evenly throughout the area of the'stock, as isdesirable foreiiicient furnace operation. 7

The present invention enables the furnace operator to selectively place materials comprising the charge either against the wall-or .in the center of the furnace. Materials of difierent size may be thus located as desired or the different elements which go to make up the charge may also be selectively distributed.

It is an object of the. present invention to provide a new and improved furnace charging apparatus.

It is a further object to provide apparatus which the charge may be selectively'directed toward the sides or centerot the furnace.

It is an additional object to provide a con struction having separate bellsections which may be selectively operated jointly orindividually.

It is also an object to provide a construction in which the charginghopper edge is designed to engage edges of both bell sections.

Other and furtherobjects will appear as the description proceeds. I

We have shown a preferredembodiment' of:

our invention in the accompanying drawings, in wh1ch Figurel 1s a fragmentary section showlng our improved bell applied to a blast furnace, both bell sections being closed Figure 2 is a side elevation of the bell oper ating mechanism;

Figure 8 is a plan view of the structure shown in Figure 2';

Figure 4 is a View of the structure shown in Figure 2 as seen from the left;

Figure 5v is a sectional view' on a reduced scale showing the small bell opened and A Figure 6 is a view similar to Figure 5 but section of the large showing both bell sections opened.

Referring first to the construction as shown in Flgure 1, the upper portion of ablast shell is shown at 11, the furnace having the re- 1 fractory lining 12 and the plates 13 protecting the stock line The charging hopper 14 issupported by the shell 11 and in turn supports the receiving hopper 15.. The lower opening in the charging hopper-l4 is closed by the central section 16 of the large bell, which comprises also the larger outer section '17. The bell section 16 is carriedby a'universal joint 18 fromthe tubular supporting member 19. The bell section 16 is provided w ribs 24' to a. small central bell. portion 25.

This portion 25' is connected by universal joint 26 to the bell'rod 27. The bell rod27 passes upwardly through the tubular bell rod 19 which supports the bell section 16.

The upper or small bell 28'closes the lower endot'the receiving hopper 15. This bell 28- i is supported by a' tubular bell rod 29 through which the bellrods 19 and 27 pass.

Referringnextto the operating mechanism as shown in Figures 2 to 1, the supporting framing 3O is'carried-above the furnace 'topin any desired manner. The tubular bell'rod 29 of the uppersmallb'ell is carried by the ends'33 of bell crank levers 34 which are sup- 2 rods 31 connected by chains 32 to the arcuate are connected to the arcuate end 39 ofthe bell crank 40. The long end of the bell crank 40 is connected by cable 41 to any suitable operating mechanism. The slotted link 42 is pivotally connected to the bellcrank 41 at 43 and is formed with an elongated slot 44. The bell rod 27, conected to the outer large bell section 17, is connected at its upper end by chain 45 to the arcuate end 46 of the bell crank 47. The long arm of the bell crank 47 carries a pin 48 which operates in the slot 44 of link 42. The end of this bell crank 47 has a depressed portion 49 which receives a cross pin 50 carried by the vertical arm 51 of an auxiliary bell crank lever 52. This bell crank lever 52 is provided with cable 53 by means of which it may be swung in the clockwise direction and has a weighted arm 54 which tends to swing it in the counterclockwise direction.

In the operation of the charging assembly, each load ofmaterial which reaches the top of the furnace is first retained on the small bell 28 and afterward dumped through on to the main bell section-16 within the hopper 14 by action of the bell crank 34, links 33 and rod I 29, the above being lowered to permit the passage of stock andagain raised to provide a resting place for subsequent loads of material and also to provide a gas seal.

After a sufficient number of loads of material have been placed on the bell section 16 within: the hopper 14, this material is low- 40 ered into the upper part of the furnace.

vBy the use of our improved construction, the discharge of stock into the furnace may be over the edge of the large bell section 17 or over the inner edge of the suspended skirt 23. Alternative means of dumping the large bell are provided whereby material may be discharged at either of these points.

If it is desired to discharge material about the large circle of the outer edge of the large bell section 17 thercable 53 is actuated to swing thebell crank 52 in the clockwise direction against the effect of the counterweight 54 so asto release the cross pin 50 from the recessed end of the bell crank 47. NVhen this release has taken effect the only connection between the bell crank 47 and the bell crank 40 is by means of the slotted link 42. cable 41 is then slackedoff which permits both bell cranks 40 and 47 to swing in the counterclockwise direction to lower the rod 19 of'the inner section 16 and the bell rod 27 of ethe outer secton 17, and the entire assembly of two bell'sections moves together, the bell in this case acting as'an ordinary bellas' shown in Figure 6.

by means of the ordinary bell.

The

A return to the former position is effected by a pull on the cable 41 which returns the bell cranks 40 and 47 to the position shown in Figure 2, after which cable 53 is slacked off so that the bearing pin 50 again engages the depressed end 46 of the bell crank 47.

In the event that it is desired to discharge a charge of material contained on the bell section 16 and within the hopper 14 through the outer section 17 and within the circle formed by the inside limit of the skirt 23, the apparatus is operated in the following manner. The cable 41 is slacked and the central bell section 16 is lowered by means of the motion of the rods 37 and the tubular bell rod 19. The position of the bell rod 27 and .its connecting linkage is not affected, the bell' crank 47 being heldin placeby thepin 50 restingv in recess Y46 and being held by the arm 51 of the bell crank 52-. The material contained within the hopper 14 therefore flows over the edgeof the bell section 16 and into the hopper'formed by the outer bell section 17 Where it is projected downwardly and inwardly over the edge of the skirt 23 toward the center of the furnace. f

' By means of the elements shown, it is ac cordingly possible to discharge material to Ward the periphery of the furnace shaft or to concentratedelivery of this material at the middle. By a combination of the two methods, it is possible to obtain many combinations of materials and to distribute ore, coke, limestone and scrap in relations to each other, which are not possible to accomplish It is also possible to effecta segregation of coarse material and fine material so as to exercise a powerful influence on the currents of gas that they may be distributed at will over the entire cross-section of the shaft or may be concentrated toward the middle of the shaft or toward its periphery at will. 1

While we have shown'one form of apparatus constructed according to our invention, this is to be understood as illustrative only, H as the construction may be modified to meet varying conditions and requirements and we contemplate such changes and modifications as come within the spirit and scope of the appended claims.

We claim: 1. In a shaft furnace, charging apparatus comprising a charging hopper, a two-part bell closing the lower end of the hopper, said bell comprising an inner part and a ring. shaped outer part, a bell rod and operating" bell crank for each of said bell parts, and a slotted link connecting the two bell cranks for joint operation. i

2. In a shaft furnace, charging apparatus 3 comprising a charging hopper, a two-part bell closing the lower end of the hopper, said bell comprising an inner part and a ring shaped outer part, a bell rod and operating bell crank for each of said bell parts, and a link connecting the bell crank, the link being pivoted to the central part bell crank and. having a slotted connection with the outer part bell crank.

3. In a shaft furnace, charging apparatus comprising a charging hopper, a two-part bell closing the lower end of the hopper, said bell comprising an inner part and a ring shaped outer part, a bell rod and operating bell crank for each of said bell parts, and a third bell crank having a part adapted to engage one of said bell cranks to prevent movement thereof.

4:. In a shaft furnace, charging apparatus comprising a charging hopper, a two-part bell closing the lower end of the hopper, said bell comprising an inner part and a ring shaped outer part, a bell rod and operating bell crank for each of said bell parts, and a third hell crank having a part adapted to engage the outer part bell crank to prevent movement thereof.

5. In a shaft furnace, charging apparatus comprising a charging hopper, a two-part bell closing the lower end of the hopper,'said bell comprising an inner part and a ring shaped outer part, a bell rod and operating bell crank for each of said bell parts, a link connecting the bell crank, the link being pivoted to the central part bell crank and having a slotted connection with the outer part bell crank. and a third bell crank having a part adapted to engage the outer part 'bell crank to prevent movement thereof.

Signed at Chicago, Illinois, this 19th day of January, 1932.

ARTHUR J. BOYNTON. PAUL ZIMMERMANN.

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