US2656123A - Crusher with combination feed and crushing screw - Google Patents

Description

l Oct.. 20, 1953 H. L. sMlTH ETAL 2,655,123

` CRUSHER WITH COMBINATION FEED AND CRUSHING SCREW Filed Dec. 23, 1950 5 Sheet's-Sheet 1 /17 TOR/vfy.

Qct. 20, 1953 H, sMlTH ETAL 2,656,123

CRUSHER WITH COMBINATION FEED AND CRUSHING SCREW ATTORNEY.

Qct. 20, 1953 H. l.. SMITH ETAL 2,656,123

CRUSHER WITH COMBINATION FEED AAND CRUSHING SCREW Filed Dec. 25, 195o y s sheets-sheet s #M65/Q7' L SMIT/f. AAW oz o A Gusmfso/v.

A 7 TOR/VE Y.

Patented Oct. 20, 1953 CRUSHER WITH COMBINATION FEED AND CRUSHING SCREW Hubert L. Smith and Arnold A. Gustafson, Port Sulphur, La., assignors to Freeport Sulphur Company, Port Sulphur, La., a corporation of Delaware Application December 23, 1950, Serial No. 202,463

12 Claims. 1

This invention relates to a crusher, particularly to a crusher of the type that uses a helical screw in the bottom of a hopper.

Although a crusher made according to this invention has been specifically applied to the crushing of block sulphur, it will be evident to those skilled in the art that a crusher made according to this invention can be used on other similar materials. In the mining operations in which a crusher made according to this invention has been used, the sulphur is cooled in large vats, and has to be broken up for convenience in transporting. It soon became evident from practice that hand methods using picks had to be abandoned in favor of mechanical crushing owing to a number of reasons, including the hazard of explosions caused by sparks raised in the course of hand operations by the steel picks striking the steel grids.

It is accordingly an object of this invention to provide a Crusher which will take large blocks of sulphur or other mineral or the like and will break up the blocks to a lconvenient handling size. This and other objects are accomplished in a crusher which is lof the hopper type with a combination Crusher and feed screw in the bottom of the hopper. The Crusher further has a discharge section secured to the hopper, with a discharge gate having openings at the end of the discharge section. A discharge mouth opens outward and downward in the end of the discharge section ahead. of the discharge gate. In addition, a plurality of small openings is provided throughout the length of the bottom of the hopper in order to permit small sizes to drop out of the hopper and not require these small sizes to be fed by the screw to the discharge mouth. A conveyor belt or other convenient conveying means is provided below the hopper and receives the discharged material. The small particles dropping through the holes serve to cushion the belt or other conveying means against the large lumps which may drop out through the discharge mouth or through the discharge openings in the gate.

In the drawings:

Fig. 1 is a top plan view of a crusher made according to this invention.

Fig. 2 is a side elevation view of the Crusher shown in Fig. l.

Fig. 3 is an end elevation view (the motor drive end) of the Vcrusher shown in Fig. 1.

Fig. 4 is a view in section on line 4-4 of Fig. 1.

Fig. 5 is a view in section substantially on line 5 5 of Fig. 4.

Fig. 6 is a view in section on line 6-6 of Fig. 4.

Fig. '7 is a view from the plane l-l of Fig. 4 in the direction indicated by the arrows.

A crusher made according to this invention is preferably mounted to be mobile on tracks 2 by means of wheels d. Any suitable framework may be provided, comprising I-beams, channels, and angles or the like, suitably braced with tubing or other structural material. Inasmuch as the details of the frame do not form any part of this invention, those details will not be described here.

Any suitable conveying means such as a conveyor belt G, suitably supported beneath the hopper, may be provided to ycarry away the crushed sulphur or other mineral.

A hopper indicated generally at 8 consists of a plurality of sloping walls and a curved bottom Wall. Thus, the hopper is provided with opposed sloping side walls IIJ and other opposed sloping end walls I2. As is best seen in Figs. 3, 5 and 7, the two opposed sloping side walls It are tangent to the curved bottom Wall I4. In fact, the two side walls I!! and the bottom wall Ill are preferably all one piece, either made of one sheet of steel or other suitable sheet material and rolled into shape, or fabricated by welding a number of pieces together, or made in any other suitable manner. i

A discharge section indicated generally at i E is secured to one end of the hopper. The discharge section preferably comprises a substantially tubular shell I 8 having substantially the same curvature as the bottom wall I4 and in fact preferably being made integral therewith. A discharge gate 20 having discharge openings 22 therein is secured to the end of the discharge section in any suitable manner, as for example by threaded members 24.

An auxiliarv discharge mouth opening downward and outward, is provided in the discharge section ahead, of the discharge `gate 2Q. The discharge mouth 26 is provided in the dise charge section by means of recesses in the bottom wall portion of the discharge section and in the tubular portion thereof. The recesses consist of a vertical, substantially plane cut 28 in the bottom wall oi the discharge section. and a horizontal, also substantially plane cut 3d in the tubular shell. Relatively small openings 32 are provided in substantial number in the bottom of the hopper, namely, in the bottom wall throughout the length of the hopper.

The rear of the end walls I2 joins with a vertical plane portion 34 (Fig. 4). Any suitable bearings 36 and 38- are supported by the vertical plane portion te and the discharge gate 20 respectively. Bearings 35 and 33 serve to support a rotatable shaft llo in the bottom of the hopper and in the discharge section l. Shaft l0 is connected for rotation by an electric motor 4 2 through suitabledrive means, as forA eX- ample, through a gear reduction unit lll and a chain drive lili.

The screw of a Crusher made according to this invention comprises the aforesaid shaft dgand,

two screw ribbons d3 and 5i! of differentdiameters mounted on the shaft 4tlg. linde,y the screw ribbon 4S has a radius such asJtorprovide ajsmfall clearance between the screw periphery. andthe hopper bottom, and the second screw ribbon 5B has a substantially smaller radius thanthatoi the screw d8.

extend the whole length of the shaft-,i,e that portion of the length ot-the shaft which is in- Sido 1.11118. horror bottom... including. the discharge section.. l t. This is :accomplished by having the convolution-s of the second scrcw 5a. liebetween the/convolutions of the.v first screw t8.. The two screw ribbonsV arepreierably 186? apart.

Tcfaoilitate the crushing operation, breaker projectionst 5.2` andes are provided on a breaker plate 555. and on the discharge gate 2tr respectivolv- The. breaker projections. are preferably inthe. crmof small triangular pyramids, although it will be understood by those skilledin the art that other forms may be used. Breaker plate 56 issecured to the. side walls lil (Fig. 5) iinrnediately below.` end wall I (Fig. 4) in a position corresponding to vertical plane portion 35i; however, plate 5&3 has aoentrally located arcuateopening of the. sarnecurvature asbottom wall. It.

in auxiliary or. extension hopper ris secured to the top of main hopper 8 by means of a flange tlganda lgridinade of crossed rods bf2E is. secured to. the too. of. auxiliary hopper V5t Operation limer bo poniodout here that this orushor will operate choke-loaded without stalling. It may also be choke-loaded before starting and can Ibe started even thoughhthus loaded.

Large blocks, even blocks having a maigimuum dimension of fourY feet, ot sulphur or other mineral aredumped by any suitable means into the auxiliary hopper 5S, falling through the. snol formed rods S2. The large bloolrsof mineral to be crushed pass down into the mainhopper 8 andare crushed by the large andsmall screw ribbons. against the brooke; promotions. 5.2?. and. 5ft. Small particles (two inches or less). nass. through openings 32 onto thehelt o, whichgrnoves in the direction of the arrow V, The small partis cles on the belt serve to cushion the blow of the large particles falling outV through the mouth 26 and being discharged through the openings 22,.

It will be apparent to those skilled in the art that this invention provides a Crusher or simple design and construction capable of handling large blocks of mineral expeditiously and reducing those large blocks to smaller blocks ci convenient handling sizes. l

While there is in this application specifically described one form which the invention may assume in practice, it will be understood that this form of the saine is shown for purposesof illustration, and that the invention may be modied and embodied in various other forms Both screw ribbons preferablyY ,feed and c rushing'screw rotatably mounted in 'the hopper.. and discharge section, a discharge gate at the end of the discharge section, said gate having` discharge openings therein, and an auxiliaryvdischarge mouth ahead of said gate, said mouth being formed by a recess provided in the. bottom and end ofn the discharge. section.

3. acrusherasin claim V2j, andb'reaker projecf..

tions in the hopper-'and in thev discharge` secl'liOIl. Y

4. A ,crusher as in claim4 2, in which the hopper bottom is, providedV throughoutr its length with a plurality ofsmall discharge openings.

5. A Crusher as in claim fl, in which said screw comprises a shaft, and two screw r-ibbons of differentV diameters on said' shaft.

6. A Crusher as in claim 5, in which both screw ribbons extend the whole length of the shaft.

'7; In combination, a material-receiving hopper having side walls and a bottom wall, a combina- ,V ticnieed and crushing screw rotatably mounted in the hopper adjacent the bottom means adjacent one end of therhopper to permit egress of coarse crushed material, additional means in the bottom or the hopper to permit theY passage of relatively fine crushed material, and conveyor means below the hopper movable in the direction from said additional means to said adjacent Wenns- 8 Thev combination of claim '7, in which the adjacent means includes a discharge section provided with discharge openings and with a discharge mouth ahead-of said openings, said mouth opening in the aforesaid direction.

9. The combination of claim 8, in which said additional means consists of a plurality of holes materially smaller than said openings and said mouth.

1Q. Ehe combination of claim 7, in which said additional means consists of a plurality of holes materially smaller than said openings and said mouth..-

11. In a Crusher, a hopper having sloping walls and a curved bottom wall, at least two of the sloping walls being opposedand being formed by substantially unbrohen planes which are tangent to thehopper bottom wall, a discharge section securedtofthe hopper, a shaft rotatable in the hopperl bottom and in the discharge section, a pair of screw ribbons ot materially diierent diameters on the shaft extending throughout the length of the shaft, the convoluticns of the one ribbon lying between the convolutions of the other, a discharge gate on the dischargel section and having discharge openings therein, and an auxiliary discharge mouth ahead of said gate.

12. In a Crusher, a hopper having sloping walls and a curved bottom wall, at least two of the sloping wallsLbeing/opposed and being formed by substantially unbrokenplanesfwhich are tangent to the hopper bottom wall, a disclfiargei section 5 secured to the hopper, a shaft rotatable in the hopper bottom and in the discharge section, a pair 0f screw ribbons of materially diierent diameters on the shaft, a discharge gate on the discharge section and having discharge openings therein, and an auxiliary discharge mouth ahead of said gate.

HUBERT L. SMITH. ARNOLD A. GUSTAFSON.

References Cited in the le of this patent UNITED STATES PATENTS Number 6 Name Date Warford June 10, 1924 Bernert June 24, 1924 Currier Oct. 4, 1932 Hanna June 5, 1934 Kohout Oct. 31, 1939 Massano May 4, 1943

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