US1611026A - Crushing and screening apparatus - Google Patents

Description

lllil- LGILOZS @ecq l4 1926.

C. A. GUSTAFSON GRUSHING AND SCREENING APPARATUS l 4 Sheets-Sheet 1 J 5 M n 0 n 4 Fil July 9, 1924 C. A. GUSTAFSON GRUSHING AND SCREENING APPARATUS I Dec. 14 1926.

4 Sheets-Shefi. 2

Filed lJu Dec. 14 W26. mmw c. A.'GUSTAFSON CRUSHING AND SCREENING APPARATUS N Filed July 9, 1924 4 Shee tsSheet 5 mamas Q. A. causTA Fsom CRUSHING AND SCREENING APPARATUS Filed' July 9 4 Sheets-Sheet 4 roads it has been found desirable that the to s Patented Dec. '14, 1926s U ITED S ATES PATENTUOFFICE.

CARLA; euszrarson, or mmunaroms, MINNESOTA, ASSIGN-OR 'ro RUssnLLGIiAnER MANUFACTURING COMPANY, MINNEAPOLIS, MINNESOTA, A CORPGRATION 0F MINNESOTA.

v cnusrrr'ns annscnnnnme APPARATUS.

7 Application filed my, 1924. Serial- No. mess.

or which may readily be moved from place to place. I

Inthe building of public highways and rough material such as gravel, used in the construction thereof; be of a substantially uniform size in order that-best results may be obtained. 'It is thereforedesirable that means he provided whereby the ravel, as it is taken from the pit,-- may passed through a sizing device wherein thecoarser material-such as stones, will be crushed to a certain degree of fineness before bein ischarged into the hopper or other sulta le receiv'ingmeans for subsequent, use in t e construction of the road; i

It is therefore the object of this invention to provide an improved screening and crushing apparatus adapted for use to prepare to a substantially uniform size, the usual rough material used in "the construction of roads and the like."

A further and more specific object of the invention is to provide suchan apparatus which is self-contained and is portable so that it may readily moved about from place to place.

Other objects of the inventionjwill more fully appear from the following descrip "tion' and theaccom anyingidrawings and will be pointed out .mthe annexed claims.

In'thei-drawings there has been disclosed a structure designed tocarry outgvthe various objects of the invention; but it is to be understood that the invention is not confined to the exact features shown as various the claims which follow. a a p In the accompanying drawings forming a part of this specification,'

Figure 1 is a longitudinal sectional elevat onon' line 1-1 of Figure 2 of my improved screenin and crushing apparatus, .showing' how t e coarser material is discharged -from the shaking screens into a crusher to be brokenfup; F

' changes may be'made within the scope of ssts of opposed side beams.

Figure 2 is a cross-sectional View on the line2-2of Figure 1 showing how the material is received from the crusher and discharged into abucket conveyor to, be returned to the shaking screens or grizzly'for final discharging into the receiving hopper; rFigure 3 is a similar cross-sectional View on the line 33 of Figure 1 showing how ified construction.

the re The novel screening and crushing plantfeatures in this invention-and shown in the accompanylng. drawings comprises a hop-- per 6 rigidly mounted in the frame of the structure. The mainframe referably congether at their ends by means of cross-memwheels 12 and 13. The hopper 6 is arranged between and is secured to the side beams 7, (Figure 3). j

1 An oscillating screen or grizzly is mounted above the hopper 6. V This grizzly preferably comprises a frame '14 suspended from connected to- .theicrushed material is discharged onto the lower coarser screen of the grizzly;

cross-bars 15 by means of links 16 as particularly shown in Figures 1 and 3. The

form of grizzly here shown preferably comprises an upper screen 17 of comparatively fine mesh and a lowersscreen 18 of a relatively coarser mesh; :A cross shaft 19* ism'ounted in the frame of the structure beneath the discharge endof the grizzly f and thisshaft has mounted thereon a pair of eccentrics 21, on which'are arranged the pitmen 22, having'their-o' flposite ends piviotally connected the lame 14 of the grizzly. Thus, whenjthe shaft 19 is rotated an oscillating or,shaking movement will be imparted to the grizzly therebycausing the hopper fiiandgthecoarser material to be discharged therefrom "into a suitable crusher tionand comprises a frame23 in which is mounted the stationary jaw 2 v adapted to as a oe", 0 finer material tojpass therethrough into the l its cooperate with. the movable jaw 25 to crush the coarser material as it is discharged thereinto. The movable jaw 25 is operated by means of an eccentric 26 mounted upon the shaft 27 of the crusher; A suitable fiy wheel or pulley 28 is mounted on the shaft 27 adapted to receive a belt 29 by means of which the entire apparatus may be driven from a suitable source of power.

The jaws 24 and 25 extend crosswise of the frame, the'stationary jaw being next to the hopper and below the discharge end of the screens (Figure 1). A plate 25 is arranged above the stationary jaw andserves to direct material passing over the screens into the space between the jaws of the crusher.

The material such as gravel, may be delivered to the'grizzly by any suitable means, as by the conveyor belt 31 operated by a roller 32 upon a suitable conve or frame, 33. This conveyor is preferably of considerablc length so as to extend into the pit from which the material is being removed and delivered to the grizzly. I claim no invention in the construction of this conveyor and I have therefore shown only a portion thereof.

A hood 34, having a cover 35 substantially closing the rear end thereof, is mounted at the discharge end of the grizzly andover the jaws of the crusher. This hood functions to prevent particles of the material such as pieces of stone from flying out of the crusher while the machine is in operation, which might cause injury toworkmen laboring about the apparatus. An operators platform 36 is also mounted ad acent the discharge end of the grizzly and a portion of this platform forms the upper wall of the hood 34, as shown in Figures 1 and 2. A perforated plate 37 is mounted in that po tion of the platform comprising the-upper wall of the hood 34, and the perforations in this plate are of such size that the operator may watch the action of the crusher during the operation of the machine.

As the coarser material, discharged into the crusher from the upper screen 17 of the grizzly, is crushed by passing between the jaws 24 and 25 of the crusher, it is discharged into an oscillating, inclined spout or trough 38. This trough conveys the crushed material into the lower or receiving end of a bucket conveyor 39 mounted adjacent one side of the machine, as particularly shown in Figure 2. This conveyor is preferably mounted at an incline and the upperend thereof extends to a point above the hopper 6. An inclined receiving spout 41 is mounted at the upper end of the bucket conveyor in position to, receive the material as'it is dis charged therefrom, and to convey it back to the grizzly. The frame 42 of the bucket conveyor and also the spout 41 are preferably supportedby means of a structural frame comprising the upright posts 43 and 44 and the horizontal cross-members 45 and 46 onto the upper screen which are suitably riveted together and mounted upon and secured to the side-beam 7 of the main frame. The upper end of the bucket conveyor is supported upon a sprocket wheel 47 carried by a shaft 48 upon one end of which a sprocket wheel 49 is mounted. A

As shown in Figure 2, the oscillatingtrough 38 mounted beneath the crusher, is preferably supported upon oscillating links 55, each having one end pivotally mounted on the main frame of the apparatus. This trough is actuated by means of a pitman 56 having one end pivotally connected thereto and its other end mounted upon an eccentric 57 secured to a shaft 58 which is mounted in I preferably in parallel relation to the side eams 7, 7, of the main frame of the apparatus. The shaft 58 is rotated b means of a bevel gear drive 61 which is riven from the crusher shaft 27 by means of a suitable chain belt 62, shown in dotted lines in Figure 1.

Referring to the drawings,

suitable bearings 59,]

especially Figures 3 and 4, it will be noted that the coarser material after having passed through the crusher is returned to the grizzly by means of the bucket conveyor, but is not discharged 17, but through an opening 63 provided therein and directly into the lower coarser screen 18. The crushed material will then pass through the screen 18 and into the hopper 6, but should some of the material still be too coarse to pass through the lower screen it will again be conveyed to the crusher for subsequent crushing or breaking up until it reaches a degree of fineness which will permit it to pass through the lower screen into the hopper 6. Thus, all of the material delivered into the grizzly from the conveyor 31 must pass through the screens but it is discharged into the main hopper 6.

Means are also provided for conveying the material from the hopper 6 and delivering it to a suitable receivin means such as a truck, wagon or bin. Sucih means preferably consists in the provision of a delivery conveyor pivotally mounted upon brackets 64 secured to the main frame of the structure and having its receiving end extending beneath the hopper 6 and its other end outwardly extendin therefrom as shown in Figure 3. The rame 65 of this conveyor is adjustably supported adjacent its outer end by means of cables or chains 66, each having one end secured to the f'upright posts 43 ofthe frame and passing around sheaves 67 and back and around a shaft 68 so that when the shaft 68 is rotated, the outer end of the conv yor may be raised or ldwered, as desired. The shaft 68 is manually operable by means of a hand wheel 69 and 1s locked in position by means of a ratchet device 70, of ordinary construction, as shown in Figure 2. The sheaves 67 are connected to the conveyor frame by means of rods 71. Rollers 7 2 and 7 3 are mounted adjacent each end of the conveyor frame and a conveyor belt 74 is mounted on these rollers and is supported therebetween by means of a series of spools 75 and rollers 76, rotatably mounted on the frame 65. The lower reduced portion 77 of the hopper 6 is open and is preferably inclined to substantially conform to the angle of the belt as shown in Figure 3. Thus it will be noted that the belt 74 forms the bottom of the hopper 6 and when this belt is inoperative the hopper may be filled without danger of the material 1 running out of the bottom of the hopper and onto the ground. This is eflected by means of the surface. of the belt resting on the concaved spools 75, as shown in Figure 2. A gear wheel 78 is mounted on the shaft of the upper roller 73 of the conveyor and this gear meshes with a pinion 79 secured to a counter-shaft 81 which is mounted in suitable bearings secured to the frame of the conveyor. A pulley 82 is also secured to this shaft and a belt 83 is mounted on this pulley and passes around a clutch pulley 84 mounted on the driven shaft '58. Thispulley is provided with a suitable clutch85 of ordinary construction indicated by dotted lines in Figure 1. This'clutch is operable by means of a vertical shaft 86 which has a lever 87 mounted upon the upper end thereof within convenient reach of an operator standing upon the platform 36, shown in full lines in Figure 2 and dotted lines in Figure- 1. An auxiliary lever 88 is secured to the lower end of t e shaft 86 so that the clutch 85' may also be actuated by an operator standing upon the ground, if so desired. Thus it will be seen that the operation of the delivery conveyor belt 74 may be controlled by means of the clutch 85 actuated-by either of the levers 87 or 88,

Means are also rovided for controlling the; operation of t e feeding conveyor 31,

- during the operation of the apparatus. Similarly, to the delivery conveyor this conveyor is also provided with a gear wheel 89 meshing with apinion 91 mounted on a shaft 92. A clutch pulley 93 is mounted on one end of this shaft and is driven by means of a belt 94 froma pulley 95 mounted on the cross-shaft 19 as shown in Figure 2.

The pulley 93 is also provided with a clutch 96, (Figures 2 and 3), of ordinary construction, which is actuated by means of a hand lever 97 arranged adjacent the hand-wheel 69 and lever 87, and also by means of a depending lever 98 whereby it also maybe actuated by an operator standing on the ground. Thus, the operation of the feeding and delivery conveyors may be controlled independently of each other and alsoindependently ofthe operation of the rest of the apparatus. A beam 99 is preferably mounted upon the horizontal angle bars 45 and 46 of the upper portion of the main frame in order to provide means for raising and lowering the feed conveyor 31, as when moving from place to place. Whenit is desired to move thisnovel screening and crushing apparatus, it is necessary to disconnect'the feed conveyor therefrom. This may therefore be conveniently accomplished by securing an ordinary block and tackle (not shown) to the upper end of the conveyor and to the loop 101 provided .at the end of the beam 99, it being understood of course, that the conveyor is detachably connected to the main frame.

Operation.

elevated thereon andpdischarged into the grizzly through which all the smaller material is directly passed into themain hopper 6. The coarser or over-sized material which cannot pass through the upper screen 17 will be conveyed thereon to the crusher at the rear end of the machine. As it is passedthrough the crusher it will be crushed or broken and discharged therefrom into the inclined oscillating trough 38 'fromwhence it will be discharged into the bucket conveyor 39 and elevated to the spout 41 and returned to the grizzly. The crushed material thus discharged into the grizzly'will pass through the opening 63 providedin the upper screen and will 'be thus discharged directly onto the lower coarser screen 18 through which it will pass into the hopper 6. Should an of the material after having passed through the crusher, still be too large to pass through the screen 18 it will again be returned to the crusher from whence it will be brought again onto the lower screen 18 and this operation repeated until all the material has'been reduced to such size that it will pass therethr'ough into the hopper. It will therefore be seen that all of the material ,must pass through the screens of the grizzly before entering thehopper 6 and will therefore be substantially of auniform 's'ize.- The hopper 6 is preferably of such rial to filla truck or wagon so that when such a device is positioned beneath the dis charge end of the delivery conveyor belt 74 and the conveyor is started, by the manipulation of either of the hand levers 87 or 88, the material may be delivered into the truck or wagon in a comparatively short period of time. As soon as the truck or wagon has been loaded the operation of the conveyor will be interrupted by means of the clutch 85 and the hopper 6 will then again begin to fill until it is again desired to empty it. Thus the operation of the delivery conveyor belt 74 may readily and conveniently be controlled to empty or convey the material from the hopper to a suitable receiving means during the operation of the entire apparatus.

In the drawing, I have shown the grizzly as comprising an upper and a lower screen but it is to be understood that a single screen or a plurality of screens, may be employed if desired and still be within the scope of the invention.

[In Figure 5 there is shown a modified construction wherein means are provided to prevent too much of the finer material, such as sand, from getting into the hopper. In certain localities or townships the rough material used in the construction of roads and highways must meet with certain specifications. Such specifications often re quire that the material must contain only a certain percentage of sand and it is there fore desirable that means be provided whereby a portionof the sand may be prevented from entering the hopper. As shown in this figure, the receiving end of the grizzly comprises two screens, the lower screen 102 being of a comparatively fine mesh and the upper screen 103 of a relatively coarser mesh. Both screens are comparatively short extending only to a point beyond the spout 41 of the bucket conveyor '39. A spout 104 is mounted beneath the lower screen'102 and this spout'extends partway into the hopper 6, an opening 105 being provided in the wall of the hopper to provide clearance for the spout. The upper screen 103 extends beyond the end of the finer screen 102 so that a gap 106 is provided between the finer screen 102 and the end of the lower main screen 107 which is prefs erably of the same mesh as the upper screen 103. The screen 107 extends from the screen 103 to the discharge end of the grizzly. In the operation of this device, the material is discharged from the feed conveyor 31 to the upper screen 103 and the finer material such as the sand and other material which can pass through the screen 103 Wlll pass therethrough into the finer screen 102. The sand will then pass through the screen 102 and drop into the spout 104- from whence it will be discharged onto the ground or a suitable receiving means (not shown) at one end of the machine. The material that is too coarse topass through the screen 102 will drop through the gap 106 and into the hopper 6. Also thematerial' that is too coarse to pass through the upper screen 103 will be discharged therefrom onto the lower main screen 107, which, as before stated, is preferably of the same mesh, and will be conveyed along on this screen to the dis charge end of the grizzly and into the crusher wherein it will be crushed and returned to the upper screen 103 in the manner similar to that'described with reference to the prior figures.

The details of the construction may be varied in many particulars without departing from myinvention.

I claim as my invention:

1; An apparatus of the class described, comprising, in combination, a frame, a hopper mounted therein, a screening means arranged above said hopper and having a fine and coarse mesh, and means for delivering the material initially to the fine mesh, a crusher mounted at one end of said screening means adapted to receive a portion of the material discharged into said screening means, and means for returning the material passing through'said crusher to the coarse mesh portion of said screenin means.

2. In the apparatus of the c as described,

the combination. of a hopper, a plurality of oscillating screens of diiferent meshes arranged above said hopper in superposed spaced relation with the finer screen above and the coarser screen below, means for feeding material initially onto the finerscreen. a crusher at one end of the screens adapted to receive andcrush the over-sized material not passing --therethrough, and means for returning to the coarser screen the material passing through said crusher.

3. In a apparatus of the class described, the combination of a hopper, a grizzly mounted for oscillatory movement over said hopper, said grizzly comprising an upper screenof comparative y fine mesh and a lower screen of relatively coarser mesh, means for feeding material'onto said upper screen, the finer .material passing throu h said screens and into said hopper, a crus er arranged at one end of said grizzly adapted to receive and crush the oves sized material and means for returning to the lower coarser screen of said grizzly the material passing through said crusher.

4. In an apparatus of the class described, the combination of a frame, a hopper mounted therein, an oscillating grizzly having screening surfaces of varying mesh, means for feeding material into said grizzly, a crusher mounted to receive and comprising, in combination,

tain mesh of said grizzly the crushed material from said crusher so that a portion of it may pass through said grizzly and into said hopper.

5. An apparatus of the class described, comprising, in combination, a portable frame, a hopper mounted therein, a fine and coarse screeningmeans above said hopper, having a fine screen for removal of sand, and a chute extending from below said fine screen and arranged to discharge fine material outside of said hopper, and a crusher arranged at the opposite end of said screen, adapted to receive the material that passes over the tail of said screening means, the middle portion of said screening means discharging material into said hopper.

6. An apparatus of the class described, comprising in combination a frame, a hopper mounted therein, a screening means located above said hopper, and having a head section of fine mesh arranged to deliver the fine material passing through said head section outside of said hopper,a crusher munted to receive the tailing material that passes over said screening means, the material that passes through said screening means intermediate the head and tail thereof being discharged into said hopper.

7. An apparatus of the class described, a portable frame, a hopper mounted therein, an oscillating screening means arranged above said hopper and provided with. screening surfaces of difierent mesh, a crusher arranged at one end of said screening means adapted to receive and crush the material that passes over said screening means, means for returning to a screening means surface of certain mesh the material passing through said crusher, and means located in proximity to said crusher for controlling the different instrumentalities of the machine. I I

8. In an apparatus of the class described,

the combination, with a portable frame, of a hopper mounted therein, a screening means arranged above said hopper, a crusher arranged at the tail end of said screening means and adapted'to receive material that passes over said screening means, a guard arranged over said crusher and adapted to deliver the material passing from said screening means into said crusher, said guard being provided with a perforated door permitting examination of the material passing from said screening means to said crusher.

9. An apparatus of the class described comprising a frame, a hopper mounted therein, a screening means mounted for oscillation above said hopper and comprising fine and coarse screening surfaces, and means for initally delivering the material to the surface with fine mesh, a crusher arranged to receive the tailings from said screening means or the coarse material too large to pass therethrough, and means for receiving the crushed material from said crusher and returning it to a coarser mesh surface of said screening means. a i

10. An apparatus of the class described comprising a frame, hopper mounted there-,

in, an oscillating screen arranged over said hopper and Whereto a body of the coarse material is delivered, said screenhaving a comparatively fine and coarse mesh, the fine mesh section of said screen being adapted to deliver fine material passing therethrough outside of said hopper, a crushing means arranged to receive the coarse tailings from said screen which are too large to pass through the meshes thereof, and means arranged to receive such crushed material and elevate'it for delivery to said screen for re-separation.

In Witness whereof, I have hereunto set my hand to this th day of June, 1924.

CARL A. GUSTAFSON.

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