US1344306A - Wet-mixer - Google Patents

Description

'R. v. MATTISON, JR-

WET MIXER.

APPLICATION FILED FEB. 12, 1919.

1,344, 306. Patented June 22, 1920.

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FIG: I

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O r p 42 y 023L222 R. V. MATTISON, JR.

WET MIXER.

APPLICATION FILED FEB. I2. 9]9. 7 1,344,306. Patented June 22,1920.

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FIG 1K UNITED STATES PATENT OFFICE.

RICHARD V. MATTISON, JR, OF UPPER DUBLIN TOWNSHIP, MONTGOMERY COUNTY,

' PENNSYLVANIA.

WET-MIXER.

Specification of Letters Patent.

Patented June 22, 1920.

Application filed February 12, 1919. Serial No. 276,681.

T 0 altwhom it may concern Be it known that I, RICHARD V. MATTI- son, Jr., a citizen of the United States of America, residing in Upper Dublin township, in the county of Montgomery and State of Pennsylvania, have invented certain new and useful Improvements in Vet- Mixers, of which the following is a specification, reference being had to the accompanying drawings.

My invention relates to a mixer which is especially adapted to produce a wet mixture of asbestos and cement, such as may be worked in an auger mill and thus made into sheets or other forms, but its utility is not thus limited. According to my invention I superimpose the mixing tank proper upon a storage tank with interposition of a gate. In both the mixing tank and the storage tank suitable agitating and mixing devices are provided, mounted upon a single shaft located axially in both tanks. Other details to which my invention is directed will be made clear as the description proceeds.

In the accompanying drawings, Figure I, is a sectional elevation of a mixer comprising mixing and storage tanks according to my invention.

I Fig. II, is a horizontal sectional view along the line II, II, of Fig. I.

Fig. III, is a similar View along the line III, III, of Fig. I.

Fig. IV, is an enlarged perspective view of the gate and,

Fig. V, is a similar view of one of the mixing blades employed in the mixing tank.

The mixing tank 1, is cylindrical in outline, open at the to with a vertical'shaft 2, rotating axially t erein. This shaft carries the bevel gear 3, by which it is driven, and at its lower end has a reduced portion 4 .for engagement with a suitable thrustbearing (not shown) for supporting it. It is journaled near its upper end in the bearing 5, supported from the upper edge of the mixing tank by the three-arm spider frame 6, while it is j ournaled near its lower end in the bearing 7 formed in the lower end of the storage tank.

Set upon this shaft Within the mixing tank are parallel arms 13, and 14, which carry scrapers 15, hinged to their o er extremities and inclined in the direction of rotation in such manner as to keep the materials in the mixing tank from clinging to the walls. Between the central shaft and the scrapers the arms 13, and 14, carry mixing blades 9, which have one-half of their lengths faced at an angle of about 90 to that of the other half, as best seen in Fig. V. These blades are mounted in boxes 10, and 11, carried on the arms,'and maybe turned therein at will by means of crank arms 12, attached to their upper ends. The crank arms'of all the blades are connected together by means of a horizontal link 16, which overlies the arm 13, being shaped to pass around the central shaft and connect the set of crank arms on one side thereof to the set of crankarms on the other side thereof, as seen in Fig. II. A lever 17 is pivoted near one extremity of the arm 13, and connected at one end to the link 16, whereby the operator may move the link to simultaneously rotate'the blades 9, through an angle of about 90 as desired. The shaft further carries between the arms 13,-and 14, a large auger or screw 8, preferably made in two sections clamped upon the shaft as shown. The function of this screw is to work the materials placed within the tank downwar'd at the center of the same.

At the bottom of the tank 1, and in its central region there is .provided a gate 20, which consists oftwo circular disks 21, and 22, each provided with radial slots or openings which by relative rotation of thedisks which separates the mixing tank from the storage tank.

The operation of the mixing tank thus described is as follows:'

So long as the gate at the bottom of the tank is closed, the rotation of the screw tends to press the material downward at the center, thence while the gate is closed the material tends to flow outwardly toward the perimeter of the tank, in which direction its motion is assisted by the action of the lower half of the blades 9. In ordinary operation the tank is filled well above the middle of its height and consequently the materials when they reach the outer walls are gathered from the same by the action of the scrapers and an inward flow of the material towardthe centerof the tank is induced in the upper layers of the material, aided by the reversed face sur faces of the blades 9. A steady circulation of the materials to be mixed is thus effected, the material being forced outward in the bottom end of the mixing tank by means of the lower portions of the blades.9, inward on top by means of the upper portions of the blades, and axially downward in the center to (and, normally, across) its valved aperture. The space at the center of the tank about the shaft 2, within the blades 9, permits the material to pass axially of the tank to reach the region of outward movement under the impulsion of the lower portions'of the blades 9, and the scrapers 15,;

serve to gather the material from the outer wall of the tank and so initiate its inward movement.

Beneath the mixing tank is a receiving tank 26. This is preferably an elongated cylinder of less diameter, but greater length, than the mixing tank. It is provided at its bottom with a perforated plate 27, with perforations as shown in Fig. III, through which the material is fed from the storage tank. Such means of exit are preferable to an unrestricted opening, straining out any large stones which might find their way into the tanks, or if any parts of theoverlying machinery are broken, they are caught by the perforated plate, instead of being per mitted to pass on with the mixture to other machinery which they might wreck. The shaft 2, as it passes axially through the storage tank is provided with arms 30, 31, and 32, which in turn carry at their outer ends rock shafts 88, and 34. Attached to these rock shafts are scrapers 35, and 36, which tend in operation to scrape the materials away from the walls of the storage tank, directing them toward the center. Angularly inclined blades 37, are set upon the shaft which by their rotation keep the wet mass in motion, and press the same downward slowly and uniformly in such manner as to compact the material and work out of the same all the entrained air which may be mixed into it during the agitation in the mixing tank above. It is 1mportant in running a mixture of asbestos and cement to an auger mill that the mill may receive a uniform wet mix without entrained air, so that as the ribbon of material is forced through the nozzle and die of the mill,--there will be no tendency to blow the surface of the ribbon as would be the case if air pockets existed in the mass fed to the auger screw.

When it is desired to mix materials by the above described mechanism the dry components are run into the mixing tank 1, and the proper amount of water added thereto. The rotation of the shaft accomplishes the mixing of these materials until the proper mass is formed. The gate separating the mixing tank from the storage tank is then opened and the material allowed to pass into the latter tank, which operation is assisted by the continued rotation of the screw 8. As soon as the upper portion of the charge in the mixing tank has passed down into the storage tank, the blades 9, are turned to an angle of about 90, so that they will then direct the materials in the lower portion of the mixing tank toward the center of the same, instead of toward the outside, as should be the case during the mixing operation. Thus the reversal of the normal outward circulation on the bottom of the mixing tank facilitates the transfer therefrom to the storage tank, and the material received by the latter from the former is forced downward by means of the blades 37, to discharge at the lower end of the latter. v

By the employment of a mixing tank and storage tank related and combined as thus described, the mixing tank can be almost entirely emptied and made ready for the next mixing operation on a new batch of materials without interfering with the continuous supply of the mix which is required when the latter is to be supplied to an anger mill. Moreover, the mixing means employed can be of a non-compacting type (such as that shown) which will produce the most eflieient agitation andmixing action. The material transferred to the storage tank in a thoroughly mixed but relatively uncompacted state can then be pressed together, and so compacted by suitable means therein which (like that shown) would of itself be relatively inefficient for mixing. Thus a continuous supply of mixed material in a suitably compacted state can be delivered from the storage tank. According to my invention the storage tank is of sufficient size to permit intermittent or periodic mixing and feeding thereto without interfering with the continuous supply of material from the storage tank, which is kept constantly sufliciently filled to act as a relay to the mixing tank.

The inclined blades in the storage tank serve the double purpose of freeing the mix, therein from entrained air, and assisting in the discharge of the material from the delivery end of the tank.

Having thus described my invention, I claim:

1. In a mixer, the combination of a mixing tank and a subjacent receiving tank with a valved aperture between them, said receiving tank having exit at its lower end; means in said mixing tank for agitating and thereby mixing the material therein, without compacting the same, even when said valve is closed and for forcing the mixed but uncompacted material downward to said valved aperture; and means in said receiving tank for pressing together and thereby compacting and for forcing downward through its exit said material received from said mixing tank, so that material mixed in said mixing tank and transferred to said receiving tank may be delivered continuously therefrom in a compacted state.

2. In a wet mixer, the combination of a cylindrical mixing tank and a cylindrical receiving tank subjacent thereto and having an apertured bottom plate: an axial rotary shaft in said tanks; agitating and mixing means in said mixing tank carried by said shaft; scrapers in said receiving tank carried by said shaft and operating upon the cylindrical tank walls; and means also carried by said shaft in said receiving tank for compacting and forcing downward and out through the apertures of said bottom plate in a continuous supply materialmixed in said mixing tank and transferred tosaid receiving tank.

3. In a mixer, the combination of'a cylindrical mixing tank and a subjacent co axial receiving tank of larger capacity than the mixing tank having restricted exit means at its lower end; a gate separating the bottom of the mixing tank from the receiving tank; a central shaft in both tanks; non-compacting agitating and mixing means carried by the shaft within the mixing tank; and downward acting compacting and propelling means .carried thereby within the receiving tank, so that material periodically mixed in the mixing tank and transferred to the receiving tank may be compacted in the latter and delivered therefrom in a continuous supply.

4. In a mixer, the combination of a mixing tank and a receiving tank of less diameter subjacent to its central portion and communicating therewith by a valved aperture, said receiving tank having exit at its lower end; means for causing the material to be mixed to circulate outward in the bottom of the mixing tank and inward in its upper portion and forcing it downward in the center, so that it shall be transferred into said receiving tank through said aperture when opened; and means in said receiving tank for compacting and maintaining in downward movement and discharging from its bottom in a continuous supply material periodically received therein from said mixing tank.

5. A mixer comprising a mixing tank; means for causing the material to be mixed to circulate outward toward its periphery in one end of said tank and inward toward its center in the other end thereof; and means for causing the inward circulating material to pass centrally of the aforesaid end of the tank to the region of outward movement.

6. A mixer comprising a cylindrical tank with an axial shaft; and means carried by said shaft for forcing the material to be mixed outward toward the periphery in one end of the tank and inward toward the center in the other, there being about the shaft space for the material forced inward to pass axially of the tank to the aforesaid end region of outward movement.

7. A mixer comprising a cylindrical tank with an axial shaft; and means carried by said shaft for forcing the material to be mixed outward toward the periphery ;in one end of the tank and inward toward the center in the other, there being about the shaft space for the material forced inward to pass axially of the tank to the aforesaid end region of outward movement: and rotary sc'apers acting upon the cylindrical tank wall to gather the material being mixed therefrom and thus initiate its inward movement 8. A mixer comprising a cylindrical tank with anaxial shaft; means carried by said shaft for forcing the material to be mixed axially in onc direction in the center of the tank: and means also carried by said shaft for forcing the material outward toward its periphery in the end of the tank to which it is forced by said first-mentioned means and forforcing it inward toward the center in the other end of the tank.

9. A mixer comprising a mixing tank tom: means for causing the material to be mixed tocirculate outward toward its periphery in the bottom of the tank and inward toward the center in its upper portion and forcing itglownward in the center, so that it shallbe discharged through said aperture when opened: and means for reversing the action aforesaid in 'espect of the circulation on the bottom of the tank. so as to facilitate discharge.

10. A cylindricalmixing tank having an axial shaft; arms carried by said shaft: and a plurality of blades carried by said arms extending from end to end of the tank and each having distinct portions in the two ends thereof faced at such different angles with reference to a radius of the tank that such portions act to move material radially in op posite directions in the two ends of the tank.

1l. A cylindrical mixing tank having a central valved discharge aperture in its bottom; an axial shaft; arms carried by said shaft; blades carried by said arms extending lengthwise in an axial direction in the tank and having the lower part of their lengths faced at an angle to the upper part; and means for turning said blades collectively with reference to said arms.

12. A cylindrical mixing tank with a cen tral valved discharge aperture in its bottom; an axial rotary shaft therein; parallel arms set upon said shaft; radially acting blades journaled in said arms extending in an axial direction in the tank and having the lower part of their lengths faced at an angle to the upper part; crank arms for turning said blades; a link uniting said crank arms; and means for shifting the position of said link so that given portions of the blades shall move the material either to or from the center of the tank.

13. An upright cylindrical mixing tank provided with an axial shaft; parallel arms carried by said shaft; scrapers hinged to the extremities of said arms with their edges in contact with the cylindrical walls of the tank; and rotary blades journaled in said parallel arms extending lengthwise in an axial direction in the tank and having the lower part of their lengths faced at an angle to the upper part, so that rotation of said blades and scrapers moves the material in the bottom of the tank from the center toward the cylindrical wall and in the top of the tank from the cylindrical wall toward the center.

14:. A cylindrical mixing tank with a central valved discharge aperture in its bottom; a shaft rotating axially therein; an auger screw carried by said shaft tending by its rotation to force the material in the tank downward; movable blades carried by said shaft which, according to their inclination, tend to move material from the center to the outer edge of the tank, and vice versa; and scrapers carried by said shaft which scrape the material in the tank from the cylindrical walls thereof.

In testimony whereof, I have hereunto signed. my name at Philadelphia, Pennsyl- Vania this tenth day of February, 1919.

RICHARD V. MATTISON, JR.

-Witnesses:

JAMES H. BELL, E. L. FULLERTON.

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