US1741325A - Measuring and mixing device - Google Patents

Description

Dec. 31, 1929. R. G. MCDONALD 1,741,325

MEASURING AND MIXING DEVICE Filed Jan. 4, 1929 5 Sheets-Sheet l l V N'LOR @mmmam 3.. Sheets-S1 2 R. G. MCDONALD Filed Jan. 1929 Dec. 3], 19294.

I MEASURING AND MIXING DEVICE W 55 ATTORNEY-5 Dec. 3l, 1929.

R. G M DONAL LD MEASURING AND MIXING DEVICE Filed Jan. 4, 19

3 Sheets-Sheet 3 %zLsATToRNEYs Patented Dec. 31, 1929 UNHTED STATES ROLAND G. MCDONALD, OF EAST ROCHESTER, NEW YORK MEASURING AND MIXING DEVICE Application filed January 4, 1929. Serial a... 330,320.

This invention relates to the measurement and mixing of liquids, and also and more particularly to the mixing of a core .sand binder and its application to the core sand. Heretofore in the preparation of core sand, the preparation of the binder and its addition to the sand has been uncertain and unsatisfactory, and required considerable manual labor. The mixtures of the binder, and the binder and sand were uncertain, variable, and far. from uniform, being dependent largely upon estimates of the workmen.

An object of this invention is to provide improvedmeans for measuring liquids accurately, and for mixing liquids in accurate proportions, with which the measuring and mixing operations may be rapidly performed with a minimum of apparatus and a mini mum of supervision and labor; and which will be relatively simple, practical, convenient, occupy a minimum of space, and be relatively inexpensive.

, A further and more specific object is to provide an improved method and apparatus for measuring accurately and mixing the in gredients of a core .sand binder, and uniformly applying the same to the core sand.

Various other objects and advantages will be apparent from the following description of an embodiment of the invention, and the novel features will be particularly pointed out in the appended claims.

In the accompanying drawings:

Fig. 1 is a side elevation of a core sand mixing. device having associated therewith a binder measuring and mixing device, constructed in'accordance with this invention;

Fig. 2isa plan of the same;

Fig. 3' is a sectional elevation through a portion of the mixing receptacle and sprayer, the section being taken approximately along the line 3 '8 -of Fig. 2; and fFig. 4 is an elevation of supply and measuring tanks and other relatedpartsfor measuring and mixing the binder liquids.

In the illustrated embodiment of the in vention, the core sand to be used is measured and deposited in a loading device 10, which is then elevated todeposit its contents into a mixing" casing or receptacle 11. This re 'may also be connected to the operating the loadmg device 10. sand mixing operation is complete, the con-.

ceptacle may have paddles or stirring devices 12 carried by a head 13 that is provided upon the receptacle 11 and is connected by gears 16 to the shaft 1 for rotating the paddles or stirring devices 12. A suitable source of power, such as a motor 17 is connected by,

a belt or chain 18 and a pulley 19 to the shaft 15 to drive the same. A. driving device 20 shaft 15'for After the tents of the receptacle may be discharged by operation of a suitable device controlled by a lever 21. The mechanism just described is old in the art, and therefore a more specific description of the details of the same is omit-; ted in the interest of clarity.

The ingredients of the binder are stored in suitable supply tanks 22 and 28, and the ingredients from these tanks are measured separately in special measuring tanks 24 and which are preferably disposed below the supply tanks in order that the liquid ingredients from the supply tanks may flow into the measuring tanks to fill the same entirely by gravity. measuring tank 25 by a suitable pipe 26. This pipe may be provided with a manually controlled valve 27 and also With a one-way or check valve 27, which latter prevents return flow of the liquid from the tank 25 but.

permits of the passage of the liquid from the supply tank into that measuring tank. The supply tank 23 is also connected by a pipe 28 with the measuring tank 24:, and may be similarly provided with a manually operated valve 29 and a one-way or check valve 85, the latter of which prevents passage of the liquid out of this measuring-tank, into the supply tank. V

The bottom portion of one of themeasuring tanks, such as 25, is connected by a pipe 31-to a suitable part of the other measuring to a level above the supply tanks 22 and 23, so that the liquids in the measuring tanks will never pass from one measuring tank to The tank 22 is connected to its.

'tank 24-, and this pipe preferably extends another during the filling operation. Thus the pipe 31 should extend to a level above the highest level to which the liquid from' either measuring tank will be forced durlng a filling operation by the pressure exerted upon said liquids during filling and while in the measuring tanks. This connecting pipe 31 also serves to trap some air or gas between the measuring tanks for a function which will be explained hereinafter. Air vent pipes 32 and 33 extend upwardly re spectively from the measuring tanks 24 and 25, and are connected to air'vent valves anc 33 respectively and also to a pressure control valve 34 through a cross connection extending between the pipes 32 and 33 and comprising short pipes 35 and 35. The control valve is also connected to a pipe 36 which supplies compressed fluid, such as air, to the pipes 32 and 33 when permitted by suitable operation of the valve 34. The valve 34, in one position, is adapted to connect pipe 36 with both pipes 32 and 33 and is also adapted to alternately open and close the short pipe sections 35 and 35 Valve 34 is arranged to be operated by a hand wheel 37 on a suitable stem which carries a gear 37 meshing with smaller gears 32 and 33 which are rigid onthe stems of valves 32 and 33 respectively, from which extend short vent pipes 38 and 38 as shown in 4. When the valve34 is in position to open either of pipes 32 or 33 for communication with pipe 36 both vent valves will be closed. Upon turning the hand wheel 37 in one direction from the normal position shown in 4, pipe 32 will be closed and pipe 33 opened, at which time vent valves 33 and 32 will be closed. By reversing the movement of the hand wheel, pipe 33 will be closed and pipe 32 will be opener The handle 37 can also be moved to a position at which the supply pipe 36 will be closed and th vent valves opened at the same time.

Thebottom ot' the tank 24 is connected by a delivery pipe 39 to the interior of the mixing receptacle 11. The delivery pipe terminates within the receptacle 11 in arcuate branches 40 extending along the side wall of the receptacle and adjacent its top. The pipe branches 40 are provided with jet apertures 41 through whicn the liquid mixture from the measuring tanks will be sprayed obliquely into the interior of the receptacle.

If any of the ingredients in the supply tank are of a character tendingto settle into component parts, or require agitation to keep themiuniform, any supply tank may be provided with a battle wall 42 disposed in spaced relation to the bottom and sidewalls of the tank. Such battle walls are preferably conical and upright, and imperforate in their interiorportion. A pipe 43 depending into the tank extends below the batlie wall 42 and terminates in arcuate branches 44 having apertures; The pipe 43 may have a control- 22 and 23 ling valve 45, and is connected to a source of a suitable gas, such as air under pressure. Thus the admission of air or gas beneath the battle wall 42 will tend to keep the contents of the supply tank 23 agitated, and prevent the settling out of any of the denser portions.

Ingredients commonly employed for a binder of core sand are a suitable oil and a resinous product known in thetrade as gu-' lack. This gulack is a liquid from the pulp digester tanks employed in the paper pulp industry, and carries the resins which were contained in the wood and liberated when the fibers were disintegrated by the action of the digester liquid. The oil and gulack are mixed in suitable desired proportions and sprayed into the core sand as the latter is being mixed. The gulack has a tendency to settle into portions of different density and, therefore will be stored in the supply tank 23 having the agitating means.

Theoperation is as follows: A charge of the sand mixture is deposited in the mixing casing or receptacle 11 and the stirring paddies 12 started in operation. An attendant" operates the valves in a manner to vent the pipes 32 and 33 and to keep the compressed gas in the pipe 36 shut off from the pipes 32 and 33. The oil and will flow by gravity into the measuring tanks 24 and 25. The filling will stop automatically when the level in the pipes 32 and 33 reaches the level of the liquids in the supply tanks. More or less air or gas will be trapped in the pipe 31, which prevents the level of the liquids rising to any great extent in this pipe.

The attendant then further operates the valves to close the vents to the pipes 32 and 33, and to connect the compressed air pipe 36 selectively with one or the other of the pipes 32 and Assuming that the oil and gulack are to be mixed and both added to the core sand, the connection will be made to the pipe The compressed air or gas from the pipe 36 will then pass through the pipe 33 into the oil measuring tank 25, and force its contents through the pipe 31 into the gulack measuring tank 24, carrying with it the air or which was trapped in the pipe 31. The gulack, air and oil from the tank 24 will be forced through the delivery pipe .39 into the arcuate sprayer sections 40, and thence sprayed upon the sand in the mixing receptacle while the sand is being agitated or stirred by the paddles 12. During this operation, the one-way orcheck valves 27 and 30 will prevent passage of the oil and gulack back into the supply tanks.

The air or gas trapped in the pipe 31 and which was carried into the gulack tank 24 under pressure serves to churn up or agitate the gulack andcauseit to team, thereby obp n m r thorou an int mate r s gulack from the tanksv ture with the oil. This foaming *mixture'is filling of the measuring tanks in the manner above explained. 7

If one desires-to discharge onlythe gulack from the tank 24, the valve 34 Will'b'e so operated as to connect the. pipe 36 only with the pipe 32,'and the compressed gas Will therefore pass directly into the tank 24 and force its contents through the delivery pipe 39 and into the mixing receptacle 11. There being no open outlet for the tank 25, no move ment of the oil therein Will occur.

lVith such a device it will be observed that the liquid ingredients of the binder may be measured accurately in a simple and rapid manner, and all of the operations may be performed under the control of a single valve operating Wheel 37. The labor required for this purpose is reduced to a minimum, and a minimum of oil and gulack are required for the reason that more uniform and dependable mixtures are obtained, and the ingredients more accurately measured.

While the invention has been described in connection With the measuring and mixing of the liquid ingredients of a core sand binder, as well as the application of such a binder to the core sand, it will be understood that the measuring and mixing features are of course, useful for other purposes Where similar problems exist, and may be so employed Within. the principle of the invention. It Will also be obvious that changes in the various details which have been herein described and illustrated in order to explain the nature of the invention, may be made by those skilled in the art Within the principle and scope of the invention as expressed in the appended claims.

I claim as my invention:

1. In measuring and mixing devices, a plurality of measuring tanks, means including individual connections to said tanks for supplying to each tank a liquid under pressure, means for preventing return flow of said liquids from said tanks When the tanks contents are subjected to pressures greater than those from said supply means, a pipe connecting the lower part of one tank With the other tank to form an air trap between said tanks,

said air trap p1pe extending above the upper ends of said tanks and also serving as a transfor connection between them, a delivery pipe connected to said other tank, a source of fluid under a pressure greater than the pressure of said liquids in said tanks from said supply means, and means for relieving the pressure in said'tanksto permit them 'tolil'l \vith'liquid from said supply means and then admitting compressed fluid to said one tank for forcing the contents of that tank into the other tank through saidair trap pipe, and for forcing Hall of the contents of all itanks through said delivery pipe.

2. Inmeasuring and mixing devices, a plurality of measuring tanks, valve controlled means for admitting liquids to said tanks, a

pipe connecting the bottom portion of one tank to the other tank, the connection with the last mentioned tank being above the point at which the pipe is connected with the other tank, said pipe extending above one of the tanks to form an air trap for checking the passage of liquid from one tank to another When the tanks are being filled, a delivery pipe leading from the other of said tanks, means for venting both of said tanks to permit them to be filled, and means for supplying a compresse-d'fluid to said one of the tanks to force its contents into-the other tank'and the contents of both tanks through said delivery pipe.

3. In measuring and mixing devioes,-a pluralityof measuring tanks, valve controlled means for admitting liquids to said tanks, a pipe connecting the bottom portion of one tank to the other tank, a delivery pipe leading from theother of said tanks, means for venting both of saidtanks to permit them to be filled, and means for supplying acompressed fluid to said one of the tanks to force its contents into "the other tankand the contents of both tanks'through'said'delivery pipe,

said pipe connecting-the tanks toone another extending materially above the upper endsof thetanks so as to form an air trap preventing passage of the liquid from one tank to the other durlng filling operation.

4:. In a'mixing and measuring device, aplurality of measuring-tanks, a plurality of supply tanks disposed at-a level above the measuring tanks and. connected individually to said measuring tanks for filling the same, check valves provided in the connections between the supply tanks and the measuring tanks for preventing return fiow of the liquids in the measuring tanks to the supply tanks, a pipe connecting the bottom portion of one measuring tank to another measuring tank, a delivery pipe connected to the bottom. portion of said another measuring tank,

means for venting said measuring tanks to permit them to fill automatically from said supply tanks, and means forsupplying com pressed fluid to said one 'of the measuring tanks 'Which is connected to the other for forcing its contents from tank to tank and through said delivery pipe,thepipe connecting said measuring tanks extending above the level of thesupply tanks to prevent passage of liquid from one'tank toanot-her during the filling operation.

5. In measuring and mixing devices, a pair of measuring tanks, means including supply pipes connected individually to said tanks for supplying liquids thereto, check valves in said pipes for preventing return flow of the liquids, a pipe connecting the bottom portion of one tank to the other tank and rising to a height greater than the liquid would rise therein from either tank under the pressure to Which it is subjected during the filling operation, a delivery pipe connected to said other tank, and means for venting said tanks to permit them to fill and for admitting compressed fluid to said one of the tanks to force its contents into said other tank and the contents of both tanks to said delivery pipe.

6. In mixing and measuring devices, a pair of measuring tanks, liquid supply pipes connected to said measuring tanks and including check valves to prevent return flow of liquid from said measuring tanks, means for supplying liquids under pressure to said supply pipes, a pipe connecting the bottom p0rtion of one tank to the other tank and rising to a height greater than the liquid would he forced therein from either of said tanks under the pressure of the liquids which are admitted thereto, said other tank havin a delivery orifice, and means for venting said tanks to permit them to fill and for admitting a com pressed fluid to said one of the tanks to force its contents through the connecting pipe into the other tank and the contents of both tanks through said delivery orifice.

7. In mixing and measuring devices, a pair of measuring tanks, liquid supply pipes connected to said measuring tanks and including check valves to prevent return flow of liquid from said measuring tanks, means for supplying liquids under pressure to said supply pipes, a pipe connecting the bottom portion of'one tank to the other tank and rising to a height greater than the liquid would he forced therein from either of said tanks under the pressure of the liquids Which are ad mitted thereto, said other tank having a delivery orifice, vent pipes leading from the upper portions of said tanks, a pipe for supplying a source of compressed fluid connected to said vent pipes, valve means controlling the admission of compressed fluid to either of said vent pipes selectively, and valve means for venting said vent pipes to permit the tanks to fill automatically.

8. In mixing and measuring devices, a pair of measuring tanks, liquid supply pipes con- 'nected to said measuring tanks and including check valves to preventreturn low of liquid from said measuring tanks, means for supply ng liquids under pressure to said supply pipes, a pipe connecting the bottom portion of one tank to the other tank and rising to a hei ht greater than the liquid Would be forced therein from either of said tanks under the pressure of the liquids Which are admitted thereto, said other tank having a delivery orifice, vent plpes leading from the upper portions of said tanks, a pipe for supplying a source of compressed fluid connected to said vent pipes, valve means controlling the admission of compressed fluid to either of said vent pipes selectively, and valve means for venting said vent pipes to permit the tanks to fill automatically, said valve means being connected together for common operation and so related as to cause a closing of the vents when the compressed fluid is admitted to either vent pipe. v

ROLAND G. MODONALD.

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