US2190044A - Mixing plant - Google Patents

Description

Feb. 13, 1940'. H. vc`. PoLLrrz MIXING PLANT Filed March 14, 1938 5 Sheets-Sheet 1 RNEY Feb. 13, 1940.A H. c. PoLLlTz MIXING PLANT 5 sheets-sneek 2 Filed March 14, 1938 (NVENTOR. HAROLD C. POLL/22? BY, g g

' ATTORNEY Feb. 13, 1940. Hjc. BQLLlTz 2,190,044

MIXING PLANT Filed March 14, 1938 5 Sheets-Sheet 3 v INVENTOR. /fA/'ow c. Pou/TZ ATTORNEY Feb. 13, 1940.' H. c. PoLmz MIXING PLANT Filed March 14, 1.938

5 Sheets-Sheet 4 Feb. 13, 1940. H, C, Pomz 2,190,044

MIXING PLANT Filed March 14, 1938 5 Sheets-Sheet 5 IN VEN TOR. HAROL C POLL/TZ BY g j ATTORNEY Y Patented Feb. 13, 1940 UNITED STATES PATENT oFFlcE MIXING PLANT Harold C. Pollitz, Cedar Rapids, Iowa, assigner to Iowa Manufacturing Company, Cedar Rapids, Iowa, a corporation of iowa Appucaucnivrawh 14, issafseriai No. 195,345

' comms. (o1. 259-153) This invention relates to mixing plants and has particular relation to a method of and machine for mixing asphalt, tar, oil andthe like with crushed rock, gravel or other aggregate.

It is a general object of my invention to provide a machine for mixing materials with liquid and for proportioning the ne materialsQcourse materials and liquid in any desired proportion.

It is another very important object of my invention to provide a rapid line-production mechanism for picking up, drying,'proportioning, mixing, and discharging materials in which the various devices for these purposes are so constructed,

aligned, mountedand integrated that they may i .to place.

It is another object of my invention to provide means for driving all the various parts of a device of the above character from a common. power source.

Another object of my invention is to provide a `device which may be quickly set up and fdismantled and is highly portable.

It is another objectof my invention to pro` vide an extremely accurate means for measuring j the quantity ofdiiferent grades and sizes of materials including liquids going into a mix, and for accurately proportioning the mix in any desired proportion'.

Other and further features and objects of the invention will be more apparent to those skilled in the art upon a consideration of the accompanying drawings and following specifications, wherein is disclosed an exemplary embodiment of the invention, with the understanding. however, that such changes may be made therein as fall Within the scope of the. appended claims, without departing from the spirit of the invention.

In said drawings: i

Figure 1 is a view in perspective illustrating a. device constructed according to a preferred embodiment of my invention as, it appears set up for use.

Figure 2 is a view in schematic diagram of the device shown in Figure 1.

Figure 3 is a view in perspective of the device shown in Figures 1 and 2 as it appears when arranged for transportation from one scene of operation to another.

.Figure 4 is a partial view in perspective of a.

'site side of the machine, and illustrates the drives employed, and

Figure 'I is a fragmentary-view in perspective of the fuel oil pumping mechanism for pumping fuel to the nozzles of the drier.

Referring now to the drawings, and more particularly to Figure 1,' all of the parts of the device are mounted on a common frame such as the frame indicated generally at III, this frame consisting of channel members Ilia and Ib, cranked at Ic to provide a pedestal at what may be termed the front or pick-up end of the device. This pedestal may be supported by means of a tractor and trailer and wheels I2, as illustrated in Figure 3, or by means of a bolster and suitable wheels and a pulling and steering tongue (not shown).

'I'he rear or discharge end of the device may be supported by a pair of oscillators or distributors on which wheels I3 are rotatably mounted.

The parts of the preferred device (Figures 1 and 2) consist of a pick-up or cold elevator 2l, a drier 3|, a hot" elevator II, a shaker screen 5I, a hopperand chute structure, indicated generally at 6I, an aggregate batcher and weighing bucket indicated generally at 1I, a pugmill indicated generally at SI, and a'discharge conveyor indicated generally at III, all of the parts of Vthe device being preferably driven by means of a power plant indicated at ISI;`

The pick-up elevator y2l is of conventional type and has a belt or Aendless chain l22 to which buckets 23 are secured. The chain is supported by sprocket traction wheel 26 and idler 24. The l'sprocket and idler are rotatably mounted on the cated at 29 and 30 and is so positioned that the buckets, at their lowermost points, will pick up aggregate such as rock and the like, from the ground. The aggregate discharged from the buckets at the top of theirl travel is thrown into a chute 32 which leads into the drier drum 3|. A op gate (not shown) is positioned in the chute 32 to prevent the escape of heat and dust from the drier.

The member 33 is a stack adapted to carry oi! the products of combustion and moisture from the drier drum 3|. The stack is hinged, as indicated at 34, in order that it may be foldeddown, as shown in Figure 3, for transportation from one point to another. The lowermost portion of the frame 21 of the pick-up elevator 2|, as indicated at 21a, may likewise be folded up, as indicated in Figure 3, to permit a tractor truck to haul the equipment.

The drier drum 3| is supported by heavy ring 36. These rings are adapted to rotate on pairs of oppositely disposed anged wheels 31, and a spocket ring 38 is provided in order to drive the drier drum, as will be hereinafter more particularly explained. The drier drum 3| is provided with paddles (not shown) on the interior thereof, for mixing of material, in accordance with the usual construction.

The aggregate, such as rock and the like, is discharged from the drier drum through the discharge chute 39. The material within the drier drum is heated by means of oil burners the nozzles of which are indicated at 40. Obviously the drier drum, being supported for rotation on an inclined axis, will slowly carry material through the drum and discharge it from the discharge chute 39 into the hot 'elevator 4|, the material being dried duringits passage through the drum. The mechanismindicated generallyat 40a is a fuel oil pump and heater set for pumping the fuel oil to the drier heater nozzle 40.

Aggregate discharged from the chute 39 into the elevator 4|, is carried upwardly by the buckets A2 of the elevator and discharged down the'chute 43 and into the screening device indicated at 5|. The elevator chain 44 is supported on sprocket 46 and idler 45 which are rotatably mounted on the frame 41. The upper portion of the frame 41, indicated at 41a, is pivotally engaged to the lower portion by the pivot 41h and may be folded down. as illustrated in Figure 3, for transportation of the unit.

Material discharged from the chute 43 is deposited on the upper screen 52 of the shaker 5|. This upper screen has a large coarse mesh having large openings equal in area to the area of the largest material to be received in the bins of the hopper.' It is constructed `of heavy materials of large cross section and acts as a buffer screen for screening out oversize aggregate and protecting the lower screens 53 and 53a. The coar'ser4 or oversize material remains on the top of the upper vscreen 52, and the liner material falls through onto the lower screens 53 and 53a. The screen 53a will pass the finest material and permit it to be discharged into the bin 33 of the hopper 6|. The coarse material, which will not pass through the screen 52, is discharged from the shaker through the discharge chute 54 onto the ground at the side of the machine. 'I'he coarse material, which has passed through the upper screen 52 but Willnot pass through the screen 53a, travels over to the screen 53 and passes down through this screen into the section 62 of bin 6|. The shaker 5|, of conventiona construction, is driven by means of an eccentric mountedat 55, and this eccentric is driven by means of the belt sheave |11.

The 'aggregate is deposited in the hopper 6|,

with the coarse material falling into the bin 62 and the iine material into the ,bin 63. The coarse material may be discharged from the hopper by opening the gate 64 and the nner material by means of opening the gate 65. These gates are controlled by levers 64a and 65a respectively. Material may be discharged from the chute 54 by opening the gate 54a.

The material discharged from the hopper 6| falls into the aggregate batcher and Weighing hopper 1| and'is weighed by means of the scale 12, the linkage 12a, 12b and 12e, being employed for conveying the proportionate part of the load to the scale 12. Any overiiow of material from the weighing hopper-1| is discharged down th overflow chute 10. l

The liquid, such as oil or the like, is discharged into the bucket 13 from the supply line 13a. A pump 14 is provided and this pump is driven by means of a sprocket 14a, as hereinafter more particularly described. The iiuidis furnished to the pump by means of the supply line 13b and the surplus is by-passed to the storage or supply tank (not shown) by means of the return line 13e. The discharge of iluid into the bucket 13 is controlledby means of thevalve 13d. The bucket 13 is supported on scale beam 15 which is operatively connected to the scale 15a, so that the weight of the oil or other liquid in the bucket may be. determined.

The discharge of oil from the bucket 13 is controlled by means of a gate valve in the b'ottom of the bucket, the control handle and crank of which are indicated at 16, and oil discharged ifrom this bucket falls into the oil spreader pan 13e which spreads and discharges the oil onto the aggregate in the pugmill 9|, which aggregate iis the aggregate discharged from the aggregate batcher 1| Vinto the pugmill. In weighing the materials the gate 65 is opened and the fine aggregate allowed to fall into the weighing batcher 1| until a certain weight of material,

'as predetermined by the requirements for the mix, has been deposited in the batcher, as indicated by the scale 12. Then coarse material is added by opening the gate 64 until a certain greater weight value, also predetermined, has been reached. 1

When the weight of the aggregate has been properly determined in this manner, a gate 11 in the bottom of the batcher is opened by means of the lever 11a and the mixed material is permitted to fall into the pugmill 9|.

Asphalt, oil or the like, as desired, is permitted to flow into the bucket 13 until the Weight of the liquidin the bucket reaches a certain value, as vindicated by the'scale 15d. The supply valve 13d is then closed and the gate valve in the bottom of bucket 13 opened to permit the liquid.

. to flow into the spreader pan 13e and pugmill 9|.

When the material falls into the pugmill 9| it is thoroughly mixed by means of paddles (not shown) within the mill. The materials are mixed in the pugmill for a period of time determined by the specifications for the mix. When the material has been thoroughly mixed by the pugmill,

chain ||4 from a sprocket ||5 on a cross shaft lindicated at H6, the conveyor being started and stopped by means of the clutch, indicated at H1, controlled by a lever ||1a.

A relatively large sprocket wheel ||8 is provided on one endof the head shaft of the conveyor opposite sprocket I|3 and this sprocket is driven by means of the head shaft H9, from the sprocket ||3.- The sprocket ||8 drives a sprocket chain |20 which in turn drives the sprocket |2|, and this sprocket drives a cross shaft |22 located beneath the outer end of the belt H2. The cross shaft |22 is provided with rubber fabric strips |23, and these strips are rapidly rotated by the shaft so that the strips strike the belt to shake and beat the belt to remove material clinging to the return belt.

The drive for driving the mixing plant is illustrated to best advantage in Figure 2. The prime mover, such as the internal combustion lengine indicated at |3|, drives a pulley |32 from the crank shaft of the engine and this pulley drives a main drive pulley |33 through the agency of the belt |34. This main drive pulley is mounted on a main drive shaft |33a. 'Ihree sprockets `are mounted on the opposite end of this main drive shaft and one of the sprockets drives the loading or hot elevator 4| by means of the chain |35, sprocket |31, shaft |310., sprocket |38, chain |39, and final head shaft sprocket 46a..

Another of the sprockets on the main drive shaft drives the pick-up or cold elevator and the drier drum through the agency of chain |42,

-sprocket |4|, bevel gearing |43, and longitudinally-extending drier drive shaft |44. The drier drive shaft |44 drives the pump 14 by means of the sprocket |41, sprocket chain |46, and sprocket 14a.

The drier drum 3| is driven by means of .a heavy sprocket, indicatedat |5|, and the heavy chain |52, which drives the-sprocket ring 38. The sprocket |5| is mounted on a short shaft |44a which slopes at the same angle as the drier. A universal joint |44b is employed for driving the shaft |44a. from the shaft |44.

The .cold or pick-up elevator 2| is driven by means of the bevel gearing |53 on shaft |4441., which drives the sprocket |54 to drive a chain |56. The chain |55 drives a cross shaft |51 by means of the sprocket |58, which in turn drives a sprocket |59 to drive another sprocket ISI. The sprocket |6| is mounted on the head shaft |52 which drives the pick-up elevator.

A sprocket |10.on the main drive shaft Illa drives the shaker 5| by means of the chain III, the sprocket |12 on counter shaft |15, the V-belt sheave |13, the V-belts |14, sheave |11, and

`shaft 55.

Stili another sprocket |55 on the main drive shaft |33@ drives one shaft of the pusmill by means of the chain |8| and sprocket |85. This shaft of the pugmill drives the other shaft of the pus'mill by means of the spur gears |52.

4A sprocket |43 on one of the Dusmill shafts drives the chain |54, which in turn'drives the sprocket |86 which in turn drives the cross shaft H6, to drive the conveyor belt ||2.

It may readily be understood that I have provided an extremely compact, mobile, and efdcient plant for the mixing of material, such as rock, gravel, oil, asphalt and the like. The materials proceed in a straight line from where the unmixed materials are picked up to the point Where they are delivered to a truck or/ the like in the mixed condition. Gravity is employed in the drying and mixing operations and the entire mechanism is mounted on `asingle supporting frame. The plant is of high capacity and yet may readily be moved about from one job to the other.

Although I have described a specific embodiment of my invention, it is apparent that modifications thereof may be made by those skilled in the art. Such modifications may be made without departing from the spirit and scope of my invention as set forth in the appended claims.

I claim as my invention: A

l. In a mixing plant including a shaker screen, batching and weighing means below the shaker screen, a. pug mill below the batching means, means for distributing liquid bitumen over the material being mixed in the pug mill, and means for delivering material from the, pug mill located with the receiving end thereof beneath the pug mill, all mounted in vertical relation, a drier drum, a cold elevator `in front of the drier drum, a stack for the drier drum, and a hot elevator between the discharge end of the drier drum and the shaker screen, the hot elevator being foldable into the space Just to the rear and above the drier drum, the stack being foldable above the drier drum, and the cold elevator being fold-- able upon itself so that the folded portion is in front of the permanently mounted portion.

2. In a mixing plant including a pick-up elevator, `a drier drum, a-stack, a hot elevator, a screen, a hopper, weighing and batching mechanism, a. pugmill and delivery conveyer, means vfor rendering the plant portable comprising hinge means in the pick-up elevator for folding the pick-up yelevator upwardly, hinge means in the stack for folding it down over the drier drum, hinge means in the hot elevator for folding it down,y the screen and delivery conveyer being detachable.

3.' In a mixing plant having a shakerscreen,

batching and weighing means, a. pug mill. and` bitumen distributing means, all mounted in vertical relation in a tower on a portable chassis, and having a drier drum, a stack for same, a cold elevator and a hot elevator, means for rendering the plant portable including means for removably mounting the shaker screen on the tower, means for hinging the lower portion of the cold elevator upwardly, means for folding the stack downwardly and rearwardly above the drier drum, and means for folding the hot elevator downwardly to the rear of and above the drier drum and below the top of the tower.l Q

HAROLD C. POLLI'IZ.

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