US2549851A - Hydraulic pumping apparatus - Google Patents

Description

L. C. POPE HYDRAULIC PUMPING APPARATUS April 24, 1951 5 Sheets-Sheet 1 Filed June 24, 1946 l/VVF/VTOA? (7 QOM w Ci @0990 g/ A TI'OR/V V April 24, 1951 L. c. POPE 2,549,851

' HYDRAULIC PUMPING APPARATUS 5 Sheets-Sheet 2 Filed June 24, 1946 gwvumm Q/OM/I/J (9 80330,

April 24, 1951 L. c. POPE HYDRAULIC PUMPING APPARATUS 5 Sheets-Sheet 3 Wi l Filed June 24, 1946 $0M Q, ERGO aw 5 Sheets-Sheet 4 Filed June 24, 1946 W SQ wil L April 24, 1951 L. c. POPE HYDRAULIC PUMPING APPARATUS 5 Sheets-Sheet 5 Filed June 24, 1946 awe/whoa Patented Apr. 24, l951 UNITED STATES PATENT OFFICE 1 HYDRAULIC PUMPING APPARATUS Louis 0. Pope, Vicksburg, Miss.

Application June 24, 1946, Serial No. 678,740

' 6 Claims. (01. s 1"10 Another object of my invention isto provide a construction of mixing and pumping equipment for controlling the consistency of mix which is supplied to pavement, building, foundation and wall construction.

Still another object of my invention is to provide a construction of mixing and pumping equipment for a mix of heavy consistency, which operates with minimum noise and is reliable for continued operation with minimum maintenance.

Still another object of my invention is to provide a construction of mixing and pumping equipment for cement aggregate of heavy consistency and by which very high pressures may be developed for forcing and directing the aggregate to a desired delivery position.

Still another object of my invention is to provide an assembly of mixing equipment, prime mover, control valve, and control mechanism for mixing and discharging a cement aggregate in which the assembly is portable and which may be readily moved to the construction location.

Other and further objects of my invention reside in a construction of mixing and delivery mechanism for cement mix or aggregate as set forth more fully in the specification hereinafter following by reference to the accompanying drawing, in which Figure 1 is a vertical sectional view through the mixing and pumping equipment of my invention; Fig. 2 is an enlarged transverse sectional view through the pumping cylinders of the equipment shown in Fig. 1, the view being taken substantially on line 2-2 with certain of the parts indicated in plan and certain of the parts illustrated in section; Fig. 3 is a transverse sectional view taken substantially on line 3-3 of Fig. 2; Fig. 4 is a plan view of the pressure pump employed in the equipment of my invention and illustrating the drive pistons which are associated therewith; Fig. 5 is a sectional view on a larger scale showing more particularly the interior of the cylinders and associated parts of the pressure pump ofthe equipment of my invention; Fig. 6 is a transverse sectional view taken substantially on line 6-6 of Fig. 5; Fig. '7 is a transverse sectional view taken substantially on line of Fig. 5 with certain of the parts of the pressure pump illustrated in end elevation; and Fig. 8 is a transverse sectional view taken on line 88 of Fig. 5.

The mixing and pumpingapparatus of my invention is constructed in portable form in order that it may be readily transported from one location to another in'building construction projects. The apparatus'operates to thoroughly mix earth or aggregate and." certain other materials (usually earth and about ten per cent cement) and water to the consistency of soft mud and pump the same into voids under concrete paving in order to jack it up to the proper level and fill all cavities underneath. The equipment can also be used as a force pump to handle liquids by installing the necessary connections, such as suction hose, foot valve, etc. The assembly can be used on various construction jobs, such as in the erection of building foundations, wa1ls, cement bulkheads, and aggregate structure generally.

The equipment is driven by a gasoline engine or other prime mover, which I have designated at H, which drives oil pump I? through the chain and sprocket drive represented at M. The engine or prime mover ll drives the mixing equipment and water pump [5 through chain and sprocket drive l3. The mixing apparatus has a water inlet I6 leading thereto through which water is delivered by water pump I5. The

mixing apparatus includes hopper l! which receives the aggregate such as earth, cement, etc. and delivers the same to the mixing chamber l8. Mixing chamber I8 includes an agitator shaft I9 with arms secured thereto which rotatably mix the aggregate and water in mixing chamber I8 and delivers the same to the outlet screen'2ll from the mixing chamber I8; I provide a slidable shutter or valve 2! for opening and closing outlet screen 20. The outlet screen 20 permits the delivery of the mixed aggregate and water to the hopper 22 of the mix pump.

I provide an inlet valve 23 for the mix pump cylinder 26, and an outlet valve 24 for the mix pump cylinder 26. A manifold 25 is provided for both the mix pump cylinder 26 and the mix pump cylinder 29.

The mix pump cylinders 26 and 29 have the mix pump pistons 4| and 39, which are slidable therein, operated by the oil drive cylinders 28 and 21. The inlet valve on mix pump cylinder 29 is represented at 30, whereas, the outlet valve for mix pump cylinder 29 is represented at 3|. The piston rods which connect with the mix pump pistons 39 and ii are represented at 32 and 33 and connected with the piston 48 of the oil engine and piston 42 of the oil engine respectively.

The valve 2324 and 3G-3l are aligned respectively with the mix pump cylinders 26 and 29 through coupling members '30 and ii. The coupling members 39 and H are each substantially rectangular in section and have a transverse dimension substantially conforming with the diameter of the mix pump cylinders 26 and 28, while the vertical dimension thereof substantially exceeds the diameter of the mix pump cylinders 26 and 29 to allow adequate space in which to accommodate inlet valve 23 and the spacially disposed outlet valve 24.

The coupling members 16 and H connect with the branch connections 14 and 75 extending from the manifold 25 through the interposition of flange plate members 12 and E3. The flange plate members i2 and f3 are symmetrical and the illustration given in Fig. 1 serves as a disclosure of the structure of both of the flange plate members and their appurtenances. Flange plate member 13 is illustrated interposed between the branch connection M and the coupling member H and is provided at diiferent levels with guide tubes and H which project in opposite directions with respect to the plane of the flange plate "i3. Each of the guide tubes 16 and T! are substantially rectangular in section and have the peripheral edge thereof extending in planes disposed at an angle to the plane of the flange plate 13. The inclined peripheral edges of each of the guide tubes serve as supports for the inlet valve 23 and outlet valve 2%. The valves 23 and 24 are pivoted with respect to the top portion of each guide tube l5 and TI and tend to normally seat theron by gravitation, but are displaceable in accordance with the strokes of the mix pump pistons ill and 39. Piston 39 during its suction stroke draws agglomerate from the supply in hopper 22 through the guide tube 16 and inlet valve 23, while the suction force thus developed maintains outlet valve 24 closed, so that agglomerate previously forced into branch connection M of manifold 25 is not disturbed. When the mix pump piston 39 commences on its force stroke, inlet valve 23 is forced closed while outlet valve 2 2 is forced open, so that agglomerate accumulated in coupling member H is forced into branch connection 14 through guide tube ii for discharge through manifoldv 25.

A similar operation is effected by piston 4! operating in conjunction with inlet valve 38 and outlet valve 3|, both of which are supported on guide tubes in a manner similar to the guide tubes 1'6 and H heretofore explained.

During the conjoint operation of pump pistons 39 and 4! agglomerate forced through guide tube I! and outlet valve 24 into branch connection it of manifold 25 is forced through the discharge pipe while backing up in abutment against outlet valve 3!. Similarly, agglomerate forced through outlet valve 35 into branch connection 75 of manifold 25 is forced through the discharge pipe while backing up as an abutment against outlet valve 24. The guide tubes represented by guide tubes 76 and ii are disposed one above the other in the flange plate represented by flange plate 13 and serve alternately to feed agglomerate to the associated coupling member represented by coupling member H and discharge the agglomerate therefrom.

A manifold 34 connects the oil drive cylinders 2'5 and 28. An oil line 35 interconnects the oil drive cylinders 21 and 28, and a pet cook 36 is provided in a connection from oil line 35 to oil line 37 which returns to the oil manifold, oil return or low pressure side 47. The oil flow control valve is represented at 38. The oil flow control valve 38 includes the transversely arranged oil flow controlled spool M operating in the transversely disposed valve cylinder 44a, having spacially disposed port control portions adapted to register with and control passages through the ports i5 and 46 leading to the oil cylinders 28 and 2?, respectively. The oil manifold 4'! provides an oil return with low pressure side connections to the oil pump l2 as shown. The oil manifold 43, pressure side, connects between the valve cylinder 54a with the oil pump 2. The oil return manifold extendin between the manifold, oil return or low pressure side 47 and the valve cylinder 44a is shown at 48.

Pilot valves 49 and 5B are symmetrically arranged in the oil flow control valve 38 and operate to control the passage of oil through oil lines 5! and 52 against the pressure of spring members 53 and 54, respectively. Oil lines 55, 56 and 51 interconnect the pilot valves 49 and with the oil manifold pressure side 43 as shown. The oil lines and 51 terminate in the valve cylinder 44a in the ports 59 and 58, respectively, at one end, as shown, and at pilot valve ports El and Bi) at the pilot valves 58 and 19 as shown.

The filler connection for the fluid oil for the oil engine is shown at 62 comprising a replaceable plug through which the oil may be introduced whenever it is necessary to renew the oil.

Operation of mixing device and misc pumpFig. 1

Materials to be used are placed in hopper I! and pass into mixing chamber [8. Water is added by means of the water pump 65, the amount of water used being controlled by a suitable valve. In some cases where city water is available, the water pump is not needed. The pump is used A only when water must be supplied from a tank wagon. The material and water are thoroughly mixed by the agitator arms and shaft i9. These arms have a slight pitch which tends to force the material to the extreme end over screen Under screen 20 is a shutter 25 which, upon being opened and closed by the operator, controls the flow of mix into the lower hopper 22. The purpose of screen 2-9 is to relieve the mix pump of matter that will not flow through without fouling the valves 23 and 24. Screen 20 is comprised of holes drilled in the discharge end of the mixing chamber. The centrifugal action of the agitator arms force the mix through the screen. The agitator arms operate transversely with respect to the openings in the discharge end of the cylinder containing the screen 23 and serve to positively force the heavy mud or agglomerate through the screen openings. Any foreign matter that does accumulate in the mixing chamber la is removed through a convenient hand hole which has a sliding cover. This is not shown on the drawing. The mix, after passing through the screen 20, falls into the lower hopper 22, and from this hopper the mix passes into valve 23 and is drawn into cylinder 26 by suction on the intake stroke of piston 39. On the pressure stroke of piston 39 the mix is forced through the outlet valve 24 into the manifold 25. From manifold 25 the mix is conveyed by hose 25a and nozzle to its place of use in the pavement or building construction.

pump-Fig. 2

This unit of the machine consists of two cylinders 28-21, so located as to have a piston 4240 in each that is on the same axis as a corresponding piston 4 l39 in the mix pump and connected by a connecting rod 3332 as shown in Fig. 2. The pistons in the driving cylinders are forced in and out in a continuous reciprocating movement by oil under pressure which is supplied by oil pump [2. The oil fiow is controlled by the valve assembly 38. This driving unit is hereinafter referred to as the oil engine.

General operation of oil engine as shown in Fig. 2

The oil engine and its connecting parts are completely filled with oil. The only new supply of oil that is needed is to replace that which is lost through leakage or change in temperature. This is supplied from a small tank (not shown on drawing) connected to the filler 62 and is vented for changes in atmospheric pressure and temperature changes. The principle of action is as follows: Looking at Fig. 2, oil from pump 12 is forced into valve 38 which directs its flow into cylinder 28 against piston 42. This .action forces piston 42 outward, or away from the flow control valve end of the cylinder. This movement of piston 42 forces oil that is in the cylinder on the opposite side of piston 42 (the system being completely filled with oil) out through manifold 34 into cylinder 21 forcing piston toward the flow control valve end of cylinder 21. Oil in cylinder 2! above piston 40 passes through flow control valve 38 to pump l2. When piston 40 reaches the end of the cylinder, the fiow control valve is automatically changed which reverse the flow of oil, after which oil under pressure flows into cylinder 27, and oil in cylinder 28 exhausts to pump l2.

Operation of flow control oalveFigs. 5-8

This flow control valve comprises a spool type of valve 44 which controls the main how of oil to the driving cylinders 28 and 27. The two pilot valves 4950, also of the spool type, are located one on each end of the main valve and have an extension on the spool that extends into each cylinder. It operates as follows: Looking at Fig. 5, wesee piston 42 in cylinder 28 at the extreme end of its stroke, it having struck the extension on the pilot valve spool 49 and moving it so that the ports 60 and 60a in this valve are opened allowing oil under pressure from oil line 55 in Fig. 6 to flow through port 60 (Fig. 6),

into line 57 to be conducted to opening 58 on Fig. 6, moving the spool 44 to the extreme position. A spool 44 moves to this position, the oil in the end not under pressure is exhausted through port 65a in pilot valve 49 and passes through the oil passage 5| and is returned to pump [2. The flow of oil under pressure from pump I2 is now directed into cylinder 28 through port 45 which puts pressure on piston 42. When piston 42 moves away from the end of the cylinder, the spring 52 in pilot valve 49 returns the spool to a closed position. A similar operation is efiected by pilot valve 50, Fig. 5. With both pilot valves in closed position, spool 44 cannot move as the oil passages at both ends are closed, looking in all the oil that is in the space at the end of the spool. When piston 40 reache the end of cylinder 21 and moves pilot valve 50 to the open position, the operation is reversed. Oil fiows through port 6! from line into line 56, through opening 59, and moves spool 44. Oil at the other end of spool 44 is exhausted through port Gla, through passage 52 into return manifold 48 to manifold 41, and into pump l2. The flow of oil is now' through valve port 46, into cylinder 21, putting pressure on piston 40. The ends of spool 44 are beveled so that it will not close the ports 58 and 59.

The alternate reciprocating movement of the pistons 46 and 42 and rods 32 and 33 in the oil drive cylinders 21 and 28 (Fig. 5) is accomplished in part by the oil placed in the cylinders on the side opposite the control valve. This construction accomplishes a material reduction in the volume of oil necessary for pump l2 to furnish for each stroke of the pistons 42 and 43. If it were necessary for pump l2 to furnish oil for two double acting cylinders it would take just twice the volume to run the machine. This construction enables the return strokes of the pistons 40 and 42 to bypass the oil through the manifold 34. Hence the same charge or quantity of oil is alternately used in the respective cylinders.

The connecting oil line 35, Fig. 5, is so located as to automatically adjust the oil needed in the cylinders 2'? and 28 at the transfer position and is of special importance in maintaining each cylinder hydraulically effective at all times.

The oil line 35, petcock: 36 and line 37 The purpose of oil lines 35 and 31 and petcock 36 is to control the amount of oil in the cylinders on the side of the pistons opposite the flow control valve. To illustrate: Suppose that when piston 40 reaches the end of its stroke, as shown in Fig. 5, there was not enough oil in cylinder 28 to force piston 42 to the end of its stroke against pilot valve 49. If this should occur, the flow control valve would not move and the mechanism would some to a stop. By placing the oil line, which is small, across the cylinders at a point just above the piston when it is at the end of the stroke, it will allow oil to by-pass from the pressure side of the piston and flow enough into the other cylinder to complete its stroke and actuate the pilot valve. The petcock 36 is to bleed the cylinders on this side of the pistons ,in case too much oil accumulates there, which it does after some use due to leakage by the pistons from the pressure side. The oil line 31 is to return such oil as is bled from the cylinders back into the pump !2 on the low pressure side. Too much oil here will shorten the stroke, and not enough will stop the machine. By cracking this petcock slightly, to the extent it will allow enough oil to flow through equal to, or slightly above that which leaks by the pistons, it will automatically adjust itself to the proper amount of oil.

Wherever in the specification I have referred to mud, I have intended to indicate the character of the agglomerate or mix upon which the equipment of my invention is intended to operate, that is, a relatively still or heavy agglomerate or mix which is forced through the hose 25a for distribution to the construction area. The machine of my invention can be constructed in any reasonable size without any material change in the design.

While I have described my invention in certain of its preferred embodiments, I realize that modifications in detail and arrangement of the equipment may be made, and I intend no limitations upon my invention other than may be imposed by the scope of the appended claims.

What I claim as new and desire to secure by Letters Patent of the United States is as follows:

1. A distribution system for aggregate comprising a distributing conduit, a delivery manifold connected with said conduit, a pair of reciprocative aggregate pumps, coupling members connecting said pumps with said delivery manifold, flange plates disposed between said coupling members and said delivery manifold, pairs of guide tubes carried by said flange plates and projecting in opposite directions, one guide tube extending into the associated coupling member and the other guide tube extending into the aligned delivery manifold, means for driving said aggregate pumps for alternate force feed operation, and means for directing aggregate to said pumps through the guide tubes leading thereto for force feed through the guide tubes leading to said distributing conduit.

2. A distribution system for aggregate comprising an aggregate distributing conduit, a delivery manifold coupled to said conduit, a pair of aggregate delivery valves located in said delivery manifold, a pair of aggregate force pumps disposed in spaced parallel relation, coupling members connecting said pumps, said pumps being connected with said manifold through said aggregate delivery valves, flange plates disposed between said coupling members and said delivery manifold, pairs of guide tubes carried by said flange plates and projecting in opposite directions, one guide tube extending into the associated coupling member and the other guide tube extending into the aligned delivery manifold, and means for feeding aggregate to each of said aggregate force pumps through the guide tubes leading thereto for alternate discharge through said aggregate delivery valves.

3. Apparatus cf the class described compising an aggregate distribution conduit, a manifold for aggregate connected with said distribution conduit for feeding aggregate to said conduit, a pair of branch connections for aggregate extending from said manifold, a coupling menr' her individual to each of said branch connections, a flange plate me ber disposed between each of said coupling members and the coasting branch connection, an aggregate force feed pump extending from each of said 'upling members on axes disposed in substantially parallel spaced relation with respect to each other, guide passages for aggregate carried by each of said flange plate members extending in opposite directions With respect to each other, one of said passages projecting into the associated coupling member and the other said passages projecting into the aligned branch connection, means for delivering aggregate to each of said coupling members through said first mentioned passages, and means for alternately driving each of sai aggregate force feed pumps for moving the mass of aggregate through coupling members and through the passages projecting into said branch connections of said manifold for discharge through said aggregate distribution conduit.

4. Apparatus of the class described comprising an aggregate distribution conduit, a manifold for aggregate connected with said distribution conduit for feeding aggregate to said conduit, a pair of branch connections for aggregate extending from said manifold and ter minating in spaced coplanar flange members, a pair of tubular passages connected with each of said flange members and projecting in opposite directions on the same vertical axis one over the other, a coupling member individual to each of said branch connections, an aggregate force feed pump extending from each of said coupling members on axes disposed in substantially parallel spaced relation with respect to each other, the tubular passages on said flange members projecting respectively into each of said coupling members and into each of said branch connections, the tubular passage in said coupling member each including a gravitationally operated valve for aggregate and the tubular passages in each of the coacting branch connections to said manifold each including a gravitationally operated valve for aggregate, means for delivering aggregate through said first-mentioned gravitationally operated valves, and means for driving said aggregate force feed pumps for forcing the aggregate from said coupling members through the gravitationally operated valves in said branch connections to said manifold for delivery through said distribution conduit.

5. In an apparatus of the class desc'ibed, a delivery conduit for aggregate, a manifold for aggregate connected with said delivery conduit, a pair of branch connections extending from said manifold and disposed on spaced substantially parallel axes, said branch connections terminating in spaced coplanar flange plates, coupling members connected with the coplanar flange plates of each of said branch connectionsforce feed reciprocative pumps for aggregate connected to each of said coupling members, means for alternately driving said force feed reciprocative pumps, each of said flange plates having a pair of tubular passage members connected therewith and projecting one above the other in opposite directions therefrom, one into the associated coupling member and the other into the aligned branch connection, a gravitationally operated valve disposed in each of said tubular passage members in the branch connections to said manifold, a coacting gravitationally operated valve disposed in each of said tubular passage members above the aforesaid tubular passage members and the gravitationally operated valve therein and located in each of said coupling members, supply means for aggregate for feeding aggregate t rough last-mentioned tubular passage members and the coasting gravitationally operated valves to said coupling members and said aggregate pumps, said aggregate pumps on each of the force feed strokes thereof operating to force aggregate through the tubular passage members and coacting gravitationally operated valves in said branch connections to said manifold for delivery through said aggregate distribution conduit.

6. A distribution system for aggregate con prising a multiple cylinder aggregate pump, a coupling member connected with each of said cylinders, a delivery manifold connected with a discharge conduit at one end and having branch connections at the other end aligned with said coupling members, a flange plate disposed between each of said coupling members and the branch connection aligned therewith, tubular members for the passage of aggregate integral with each of said flange plates, said tubular members projecting in opposite directions into said coupling member and into said branch connection and terminating in oppositely inclined valve seats disposed at angles to the plane of the associated flange plate, flap valves pivoted adjacent the top of each of said tubular members and normally seated in closed position on the inclined valve seats of said tubular members under the action of gravity and force pressure developed by strokes of said aggregate pump, a feed hopper for aggregate, a connection from said feed hopper to each of said coupling members through the tubular members in the associated flange plate for feeding aggregate under composite suction pressure and gravitational action to said coupling members through the associated tubular members extending into said coupling members for force feed therefrom through the tubular members extending into said branch connections of said delivery manifold to said discharge conduit.

LOUIS C. POPE.

Name Date Number Lyons Aug. 17, 1886 Number 20 Number 10 Name Date Seifert Dec. 10, 1929 Blood Oct. 4, 1932 Ferris et a1. Dec. 19, 1933 Ball Feb. 12, 1935 Carroll Dec. 10, 1935 Pipes Sept. 8, 1936 Karstens Nov. 17, 1936 Mason Aug. 12, 1939 Butler Dec. 19, 1939 Holmberg Nov. 5', 1940 Vickers Feb. 24, 1942 Lowry Mar. 10, 1942 Hollander May 19, 1942 McCormick Sept. 22, 1942 MacMillin Jan. 2, 1945 Fitzgerald Jan. 15, 1946 FOREIGN PATENTS Country Date Great Britain Sept. 26, 1941

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