US2563681A - Large bell assembly - Google Patents

Description

Aug. 7, 1951 Filed mm1, 1946 H. O. JOHNSON ET AL LARGE ABELL. ASSEMBLY 2 sheets-sheet 1 Aug- 7, 1951 H. o. JOHNSON ET AL 2,563,681

LARGE EELL ASSEMBLY Filed March l, 1946 i l, 2 Sheets-Sheet 2 Y F1g'.2.

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Patented Aug. 7, 1951 LARGE BELL ASSEMBLY Harry 0. Johnson and Martin OHare, Donora, Pa., assignors to The American Steel and Wire Company of New Jersey, a corporation of New Jersey Application March 1, 1946, Serial No. 651,109

7 Claims.

This invention relates to a large bell assembly for a blast furnace. As is well known, the assembly of the large and small charging bells at the top of the blast furnace is relatively complicated because the two bells have a common axis. Various means have been used in fastening the large bell to its bell rod, but they are costly, complex and lack rigidity. The assembly is further complicated by the necessity of providing a gage rod that will accurately register the level of the stock in the blast furnace. Normally two gage rods which are located off center are used, but because of their location they register high and low spots of the stock depending upon the position of dumping from the distributing hopper.

It is an object of our invention to provide a large bell assembly in which the bell is rigidly fastened to the bell rod in a simple manner which permits a gage rod to be located centrally of the furnace.

This and other objects will be more apparent after referring to the following specification and attached drawings, in which:

Figure 1 is an elevation, partly in cross section. of the bell assembly;

Figure 2 is an enlarged sectional View taken on the line II--II of Figure l;

Figure 3 is an'enlarged sectional View taken on the line III-III of Figure 1;

Figure 4 is an enlarged sectional View taken on the line IV--IV of Figure 1; and

Figure 5 is an enlarged detail of the connection between the bell rod and large bell.

Referring more particularly to the drawings, the reference numeral 2 indicates the top wall of a blast furnace. Mounted on top of the blast furnace in the usual manner is the large bell hopper 4 which is open at the bottom end to provide a seatl for the large bell 8. As best shown in Figure 5, the top of the large bell is bored out to provide a central opening Il) which tapers downwardly toward the center of the bell. A small hole I2 extends from this opening into the bell for a purpose which will appear later. The bell 8 has an integral flange I4 which surrounds the opening I8 at the top thereof and is reinforced by equally spaced webs I5. A bell together by means of bolts 28 which force the tapered end 28 of the rod I8 into the tapered bore I0 of the large bell as they are tightened. The large bell rod i8 extends upwardly through the small bell 38 and the small bell rod 32 to the large bell operating beam 84 which is connected at its outer end to the hydraulic motor 38. As shown in Figure 2, the upper part of the large bell rod I5 has a reduced threaded portion 38 which passes through the crosshead 48 of the beam 34 and is fastened thereto by means of nuts 42 on each side thereof.

The cross head 48 has a projecting trunnion 44 on each side thereof to which is attached a link 48. The links 48 are allowed to swing radially on the trunnions and are held in horizontal position by washers 48 and pins 5U. The links 46 transmit the up and down movement from the large bell beam 34 to the large bell rod I8, thus opening and closing the large bell 8. By means of this upper connection, it is possible to adjust the length of the bell rod I6 in order to properly seat the large bell.

The straight threaded end 38 makes :it possible to use a one-piece tubular small bell rod 32 instead of the split two-piece rod which is normally used. The small bell rod 82 passes through the small bell hopper 52 and is connected to the small bell operating beam 54 by means of links 58 which are connected by pins 58 to the beam. The links 56 supports a trunnion 68 which is held to the small bell rod 32 by means of a split collar 62 fastened together by bolts 64. As shown in Figure 4, the lower porti-on of the small bell rod 32 is provided with a recess 88 for receiving the split small bell 88, the sections of which are held together in the recess 88 by bolts 88 passing through flanges 'i8 on the various bell sections.

A special steel center cable 72 passes through the hole I8 in the large bell rod and the hole I2 in the large bell 8. A weight lll is attached to its lower end and its upper end is attached by means of connector *I8 to a standard flexible cable 'I8 which passes over sheaves 88 and thence down to a standard hoisting drum (not shown). The weight I4 is heavy enough to pull both cables 12 and 'I8 taut and correctly register the level of the stock 82 when it rests thereon below the large bell e, as shown in broken lines in Figure 1.

In order to prevent leakage of gas from the furnace the large bell rod I6 is provided with a threaded bore 84 at its upper end for receiving a packing gland 86 which has an opening 88 therethrough to permitl passage `of the cable 12.

While one embodiment of our invention has been shown and described, it will be apparent that other adaptations and modifications may be made without departing from the scope of the following claims.

We claim:

1. A large bell assembly for a blast furnace comprising a large bell having a central opening in the top thereof, said opening tapering downwardly toward the centerV of the bell, a flange on the bell surrounding the opening, a rod, a tapered portion at the bottom end of said rod Which is received in said opening, the top of said tapered portion being of greater diameter than the rod adjacent thereto to provide a shoulder on the rod at the top of the tapered end, a top flange having an opening therein surrounding the main portion of the rod and resting on said shoulder, and means for fastening the flanges together and tighteningthe top flange against the shoulder to force the tapered end of the rod. into the tapered opening.

2. vA large Ybell assembly for a blast furnace comprising a large bell having a central opening in the top thereof, said opening tapering downwardly toward the center of the bell, a flange on the bell surrounding the opening, a rod, atapered portion at the bottom end of said rod which is received in said opening, the top of said tapered portion being of greater diameter than the rod adjacent thereto to provide a shoulder on the rod at the top of the tapered end, .a top flange having an opening therein surrounding the main portion of the Arod .and resting .on said shoulder, mea-ns for fastening the anges together and tightening the top flange against the shoulder to force the tapered end of the rod into .the tapered opening, a reduced threaded portion at the Ytop of the rod, an operating beam crosshead surrounding said threaded portion, anda nut threaded on said threaded vportion on each side of the crosshead. Y Y

3. A bell Vassembly rfor a Ablast furnace comprising a large bell having a central :opening in the top thereof, said opening tapering downwardly toward the center of the bell, a Vflange on the bell surrounding the opening, a rod having a tapered portion at the bottom end thereof which is received in .said opening, `the top .of said Vtapered portion being of greater diameter than the -rod adjacent .thereto to provide a shoulder on the rod at the top of `the enlarged end, a top flange having an'opening therein surrounding the main ,portion of vthe .rod and resting on said shoulder, means for Yfastening the .flanges together and tightening .the top flangeagainst the shoulder to force the tapered end of the rod into the bell opening, said lbell and bell rod having aligned axial openings therethrough, and an elongated measuring-.device passing through the openings in the Ylarge bell and large bell rod :for measuring the level of stock in the furnace,

4. A bellassemblyfor a blast furnace comprising .a Ylarge bell having .a central opening in the top thereof, said opening tapering downwardly toward the center-of the bell, a lange .on the bell surrounding the opening, azrod having a tapered portion at ythe bottom end thereof which is :received in said opening, .the top lof said tapered portion being of greater diameter than the rod adjacent thereto to provide-ashoulderon the rod atthe top of the enlarged end, a top flangehaving an opening therein surrounding the mainportion of the rod andresting on said shoulder, means for fastening V.the vianges @together 1and tightening the top flange against the shoulder to force the tapered end of the rod into the bell opening, said bell and bell rod having aligned axial openings therethrough, a cable passing through the aligned openings, and a weight attached to the bottom of said cable for measuring the level of stock in the furnace. Y

5. A bell assembly for a blast furnace comprising a large bell having a central opening in the top thereof, said opening tapering downwardly toward the center of the bell, a flange on the bell surrounding the opening, a rod having a tapered portion at the bottom end thereof which is received in saidropening, the top of said tapered portion being of greater diameter than the rod adjacent thereto to provide a shoulder on the rod at the top of the enlarged end, a top flange having an opening therein surrounding the main portion of the rod and resting on said shoulder, means for fastening the flanges together and tightening the top flange against the `shoulder toA force the tapered end of the rod into the tapered opening, a reduced threaded portion at the top of the rod, an operating beam crosshead surrounding said threaded portion, a nut threaded on said threaded portion on each side ofthe crosshead, said bell and bell rod having aligned axial openings therethrough, a small bell surrounding said large bell rod, a small bell rod attached to said smail bell and surrounding said large 'bell rod intermediate the ends thereof, a cable passing through the aligned openings, and a weight attached to the bottom of said cable for measuring the level of stock in the furnace.

6. A 'bell assembly fora blast furnace comprising a large bell hopper having its bottom 'end open 'to provide a seat, a large bell having a greater diameter than said seat and adapted to be raised 'to seat on said seat, said large bell having a central opening therethrough, a large bell rod fastened to the top of the 'bell, said rod having 'an vaxial opening therethrough,fa small bell hopper fastened tothe .top of the large 'bell hopper, said vsmall bell hopper having its bottom end open to provide a seat, a small bellsurroundingfsaid large bell rod and seated on the last named seat, a smallbell .rod .attached .to said small bell Aand surrounding said large bell rod intermediate the ends thereof, and an elongated measuring device passing' through thev openings in the'large bell and large bell .rod forfmeasuring the level of stockiin the furnace.

7. A bell assembly for ablast furnace comprising a large bell hopper having its bottom end. open toprovde a seat, la large bell `having Ya greater diameter than said seat and adapted to be raised to vseat en said seat, said vlarge'jbell having a central opening therethrough, a largeibell rod fastened 'to the `top of the bell, said rod having an axial opening therethrough, a small bell hop.- per fastened to the top of 'the .large "bell 'hoppen saidf small bell hopper having its bottom end open to provide a seat, a small bell surrounding said large bell rod and seatedv on thelast' named seat, 'a Asrnall'bell rod attached Yto said small bell and surrounding'said largebell rod intermediate the ends thereof, a cable passing through the openings in the large 'bell and large bell.rod, and afWeight attached tothe bottom of said cable Yfor measuring'th'e level of stock in the' furnace.

HARRY O. JiO'IeINSONLv MARTIN OHARE. Y

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REFERENCES CITED Number The following references are of record in the 11178522 fue of this patent: UNITED STATES PATENTS 5 2,221,802 Number Name Date 2,408,945

291,773 Reilly Jan. 8, 1886 677,665 Johnson, Jr July 2, 1901 951,128 Johnson Mar. a, 1910 Number 951,704 `snmidv; Mar. a, 1910 10 41447 1,020,929 ROW Mar. 19, 1912 Name Date Kennedy Apr. 11, 1916 Kling June 8, 1926 Zimmerman Apr. 9, 1935 Krobusek Nov. 19, 1940 Mohr et al. Oct. 8, 1946 FOREIGN PATENTS Country Date Sweden July 28, 1920

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