US3082917A

US3082917A - Hydraulic spray pump

Info

Publication number: US3082917A
Application number: US845367A
Authority: US
Inventors: Donald H Anderson; Walter R Peterson
Original assignee: HD Hudson Manufacturing Co
Current assignee: HD Hudson Manufacturing Co
Priority date: 1959-10-09
Filing date: 1959-10-09
Publication date: 1963-03-26
Anticipated expiration: 1980-03-26
Also published as: BE595592A

Description

March 25, 1953 D. H. ANDERSON ET AL 3,082,917

HYDRAULIC SPRAY PUMP 3 Sheets-Sheet 1 Filed Oct. 9, 1959 .mns

March 26, 1963 D. H. ANDERSON ET AL 3,082,917

HYDRAULIC SPRAY PUMP Filed Oct. 9, 1959 l WM March 26, 1963 D. H. ANDERSON ET Ax. 3,082,917

HYDRAULIC SPRAY PUMP 5 Sheets-Sheet 5 Filed 0G13. 9, 1959 I r11/'enf org Dafzad Jn denso 11.

3,082,917 HYDRAULIC SPRAY PUMP Donald H. Anderson, New Lenox, and Walter R. Peterson, Plainfield, Ill., assignors to H. D. Hudson Manufacturing Company, Chicago, Ill., a corporation of Minnesota Filed Get. 9, 1959, Ser. No. 845,367 2 Claims. (Cl. 222-243) tes arent and extendible shafts, belt driven by the power-take-otl i shaft or belt pulley, or mounted directly on the powertake-off shaft of the tractor.

All of these prior forms of drive means have inherent d-isadvantages as hereinafter pointed out. Belt drives are cumbersome and difcult to maintain in proper tension, while universal joints have a limit in turning radius under full load. Direct power-take-off mounted pumps of the piston type are limited tospeeds of `approximately 540 rpm. so that the more recent tractors having a powertake-ott speed of approximately `100i) r.p.m. make direct mounted piston pumps obsolete or impractical for the purpose of operating a spray pump.

Furthermore, piston-type pumps, whether power-takeoi or engine driven, have a pulsation characteristic in direct relation to the speed and displacement per stroke. This pulsation is produced when the circular motion of the drive is translated into the horizontal or linear motion 'of the piston. These and other disadvantages of Iand objections to theprior types of tractor-operated spray mechanisms have been eliminated in the present novel assembly, in which the pump is operated without any connection to or engagement with the power-take-of shaft of the tractor. v

3,082,9l7 Patented Mar. 26,1963

Vice

Another important object of the present invention is the provision Iof a novel hydraulically-actuated spray pumping -system embodying a pair of aligned cylinders each having a plunger or piston actuated by a common reciprocating plunger shaft, one of said cylinders providing an oil cylinder connected to the hydraulic system and the other providing a spray cylinder for continuously supplying spray solution under pressure to a spray boom or spray gun with the volume of dispensed spray solution being readily -adju-stable to the capacity of the hydraulic system by a mere change in the ratio in effective area between the two aligned cylinders. i

Another object of the present invention is the provision of a novel hydraulically-actuated piston pump, either tractor or engine driven, having a reciprocating pump plunger and an agitator on the end of said plunger in the spray supply tank for continuously agitating the spray solution and maintaining the mixture in uniform suspension.

Further objects are to provide a construction of maximum simplicity, efficiency, economy and ease of assembly Another important object of the present invention is j to provide a novel hydraulically-actuated spray pump in which the pulsation characteristic of the belt drivenior shaft driven piston pump is eliminated due to the fact that the speed of travel and the displacement per inch of travel is maintained uniform in both directions of travel. In this novel assembly when operated from the hydraulic system of a tractor, the only connections between the tractor and the pump are the oil line hoses connecting the tractor hydraulic system to the driving cylinder of the pump, whereby the tractor may be turned at any angle from the sprayer under full load and continuous operation.

While the present invention is disclosed as operated from the hydraulic system of la tractor, its novelty is not limited thereto but resides broadly in a novel means whereby the energy present in any hydraulic system can be readily converted by the provision of a driving chamber, a spray liquid chamber, an actuating valve mechanism and a tripping and reversing mechanism all combining and operating -in a novel manner to dispense or discharge the spray liquid under pressure. I

The present invention further comprehends a novel hydraulically-actuated spray pump assembly having a hydraulically-actuated plunger in a drive cylinder, a spray plunger in a driven cylinder, a shuttle valve, a tripping and reversing mechanism for actuating the shuttle valve ,to controlmovement of the hydraulically-actuated plunger of the drive cylinder, and a plunger shaft having means for simultaneously reciprocating both plungers and operating the tripping and reversing mechanism which in turn controls the shuttle valve and drive plunger.

and operation, Iand such further objects, advantages and capabilities as will later more fully appear and are inherently possessed thereby.

In the drawings:

FIGURE 1 is a top plan view of the novel spray pump assembly and the spray tank. v

FIG. Z is a View, part in horizontal cross section and partin side elevatiomthe section being taken approximately on the longitudinal line 2--2 of FIG. l and viewed in the direction of the arrows, and including all-but the shuttle valve assemblywhich is shown in side elevation.

FIG.- 3 is a view in vertical cross section taken approximately on the line 3.-'3` of FIG. 2 and viewed in the direction of the arrows. l

` FIGQ`4 is a diagrammatic View in horizontal cross section 4through the shuttle valve and drive cylinder, the view showing the position of the shuttle valve, the drive piston and the flow of the hydraulic fluid to `and from the drive cylinder for moving the drive piston to Aadjacent one end of its cylinder.

FIG. 5 is a view similar -to FIG. 4 but showing the Vshuttle valve 4and drive piston moved to a substantially centered position.

`FIG. 6 is a view similar to FIG. 4 but showing the shuttle valve with the drive piston reversed and moved to adjacent the other end of the drive cylinder.

Referring lmore particularly to the disclosure in the drawings in which is shown an illustrative embodiment of the novel spray pump assembly operated from the hydraulic oil system of ya tractor, the oil or hydraulic fluid for actuating the pump is supplied .under pressure from a supply tank 10i which may be an oil reservoir or the crank case of the tractor hydraulic system, but separate `trom the tractor engine. The `oil is pumped rfrom the tank 10' of the tractor hydraulic system Vthrough a supply line lll to the tractor pump P and from the tractor pump through a communica-ting pressure line l2 -to a shuttle valve assembly 13, from where the oil under pressure is supplied turn line ldit; are preferably oil line hoses ttor passage of the hydraulic iluid. Y v

The housing 15 is provided with a longitudinal cylinmovement a shuttle valve 21 having a valve stem or plunger rod 22 provided with three spaced and solid spools 23, 24 and 25, each conformably received and movable with the stem in the bore 1-9, the intermediate spool 24 being uniformly spaced from the end spools 23 and 25 and with the outer end of each of these end spools provided with an annular groove receiving an O-ring 26 for effectively sealing against leakage therebeyond of the hydraulic fluid. This shuttle valve is automatically actuated by tripping and reversing mechanism in a manner as hereinafter explained.

In the housing 15 and communicating with the bore -19 are spaced

ports

27 and 28 at one side of the valve and spaced ports y29 and 31 at the other side, th'e end ports 27 and -31 opening into a common passage 32 communicating with the return line 18. The port 28j communicates with an oil line 33 opening into a port 34 preferably as shown in IFIG. 2 in one end wall 35 of a driving cylinder 36 of the Y hydraulically driven fluid pump assembly 14, and the port 29 communicates with an oil line 37 opening into a port 38 preferably in the other end wall 39 of the driving cylinder. ln the end walls 35 and 39 of this drivng cylinder 36 is concentrically mounted one end of a sectional plunger shaft 41, -the shaft projecting through a frame 42 and its other end projecting through the end walls or closures 43 and 44 of an encompassing spray cylinder 45. On the extreme end 46 of this shaft is mounted a plate agitator 47 by means of suitable attaching means such as a lock nut and washer 48, the spray cylinder and the agitator being preferably submerged in the spray solution contained in a supply tank 49.

The plunger shaft 441 is shown formed of multiple sections and on the connected sections within the driving cylinder 36 is a plunger l51 comprising opposed cup leathers 52 and S3 separated by a spacer 54 and each member 52 and 53 being retained fin operative position by a collar 55 threaded onto a reduced threaded connection 56 of the plunger shaft. A similar plunger 51B having cup leathers x52 `and 53 a spacer `54 and collars 55, is mounted and retained on a reduced threaded connection 57 of the section of the plunger shaft 41 concentrically mounted within the spray cylinder 45.

The portion of the plunger shaft 41 between the end plates `58 and 59 of the frame 42, is also divided at 61 with the adjacent ends threaded and received within a connecting sleeve 62 having an outwardly projecting collar or annular ange '63 movable longitudinally with the reciprocating plunger shaft 41. A guide bar 64 extends parallel yto but in spaced relation with the plunger shaft 41 with its ends mounted in the end plates 58 and 59 of the frame 42, these end plates being joined by bolts 60 to the adjoining end walls 39 and 43 of the cylinders 36 and 45. On .this guide 4bar is slidably mounted an elongated sleeve 65 having spaced collars 66 and 67 each anchored tothe sleeve by means of a set screw or other attaching means 68.

'Ihe sleeve 65 intermediate its collars is provided with an upstanding rib or fin `69 having an opening for receiving and connecting thereto the lower end of a centered coil or contractile spring 70 of a tripping and reversing mechanism, with the other end of this spring connected to a depending part 71 at the upper end of an inverted, substantially U-shaped lever 72. The spaced arms 73 of this lever are pivotally mounted adjacent their lower end by a bolt or other suitable attaching means 74 upon spaced upstanding brackets 75 atl'lxed to the upper angle members 76 forming the corners of Ithe rectangular frame 42, and 'these angle members anchored at their ends upon the end plates 58 and 59 of the frame 42. At the exterior of each lever Iarm 73 the frame has rigidly supported thereon spaced inwardly

inclined supports

77 and 78 joined by an upper longitudinally extending connecting bar or brace 79, and connecting transverse bars or braces 81 each having an inclined rubber stop or abutment 82. These spaced stops limit the throw or pivotal movement of the upper 'end of the lever 72.

Each of the spaced 4arms 73 of the lever 72 is provided with spaced openings 83 one of which is Iadapted to receive the pivotal connection 74 and another to receive a bolt or pivotal connection 84 for connecting each arm 73 to an arm or bifurcation 8S -of a movable link 86, providing .an overeen-ter linkage for the tripping and reversing mechanism. 'I'he arms l85 of 'the link 86 are joined at the forward end and .thereat connected to the bifurcated end 87 of the shuttle valve stern 22.

The collars 66 and -67 are spaced apart on the sleeve 65 and so disposed as to lbe contacted by the collar 63 on the sleeve 62 of the plunger shaft 41 as the latter reciprocates back and forth. Thus as the plunger shaft 41 travels to the right, the xed collar 63 contacts the collar 67 onV the sleeve 65 and moves the latter on the guide bar 64. When the sleeve 65- travels to the right past the center of the spring 70, which is connected at the lower end to lthe sleeve 65 and at its upper end to the lever 72, the latter snaps to the right against the shockabsorbing stop 82 at the right, and moves the link 86 to reverse ythe shuttle valve 21 whereupon the direction of travel of the plunger shaft 41 and its cylinder plungers 51 and 51a is reversed thereby effecting and maintaining a continuous operation of the spray pump.

Referring to the spray tank 49 into which projects an end of the plunger shaft 4l, the end wall 43 of the spray cylinder 45 is provided with an inlet port l88 and a coupling member 89 providing a valve housing having an inlet tube 90 depending into the tank 49 to adjacent the bottom thereof for the passage of spray solution from the tank into one end of the spray cylinder 45 containing the driven plunger 51a. In this coupling member 89 is an inlet check valve 91 controlling the ilow of the entering spray solution. The end wall 43 is also provided with an outlet port 92 communicating with a coupling member 93 providing a valve housing for a check valve 91 for controlling discharge of the spray solution. 'I'he opposite end wall 44 is provided with a similar inlet port 88a having a coupling member 89a providing a housing for a check valve 91 (not shown), and an inlet tube 90a and an outlet port 92a communicating with a coupling member 93a providing a valve housing for a similar check valve 91 for controlling discharge Vthrough this outlet port, the coupling members communicating with the opposite discharge ports 92 and 922L being joined by a common connection 94 to a common feed line 95 from where the spray solution is continuously discharged from one and then the other end of the cylinder 45 as the plunger 51a is continuously reciprocated. This discharge or feed line 9S is provided with a pressure gauge 96 and an air chamber 97 whereby spray solution is supplied continuously to a spray nozzle or spray boom not shown as the plunger 51a is reciprocated.

With the spray pump or cylinder 45 wholly or partially submerged in the spray liquid in the supply tank 49, as the plunger 51a moves to the right (as viewed in FIG. 2) by the reciprocatory movement of the plunger shaft 41 actuated by the plunger 51, spray liquid is drawn into the cylinder 45 through the inlet port 88 and past the inlet valve 91. Simultaneously spray liquid is forced out of the cylinder 45 at -the other end by the plunger 51a, 4through the outlet port 92a and past its check valve 91 to the spray boom or spray gun through the discharge line 95. A pressure control and relief valve 98 regulates the pressure of the discharge.

This pressure relief valve 93 comprises a housing 99 having a base provided with an inlet port 100 communicating with a return hose 101. In the housing is a springloaded check and relief valve member 102 controlling ow through the inlet port 100, the compression on the expansible spring 103 which bears against the valve member 102 being controlled by a vertically movable stem 104 bearing at its lower end in the housing against the upper end of the spring, and a pivoted handle 105 having a cam surface 106 bearing against the upper, extended end of the stem 104. Any excess liquid under pressure bypassing the relief valve member 102 is returned to the supply tank 49 through the return hose 101.

In FIGS. 4, 5 and 6 the shuttle valve assembly 13, the driving cylinder 36 with an end of the plunger shaft 41 and its plunger 51, and the oil supply reservoir are shown diagrammatically.

While FIG. 2 shows the spray or driven cylinder 45 of a diameter similar to that of the oil or driving cylinder 36, it is to be understood the present invention contemplates that the spray cylinder may be of any diameter necessary to -deliver the required gallonage of spray solution to the spray boom or spray gun for controlling the ultimate discharge. Thus by varying the ratio in area between the oil cylinder 36 and the spray cylinder 45, the volume of spray solution required may be adjusted to the hydraulic system of the tractor.

Each model of tractor has a given amount of energy available through its hydraulic system. For example, a tractor with a capacity of 7 gallons of oil per minute at 750 pounds per square inch pressure has 5,250 gallon/ pounds of energy available. Thus, if the cylinders 36 and 4S are of equal diameter, spray cylinder 45 delivers 7 gallons per minute at 750 pounds per square inch pressure, not compensating for any friction loss. If the area of spray cylinder 45 is three times the area of cylinder 36, such spray cylinder would deliver 21 gallons per minute at 250 pounds pressure, making it evident that the volume of available spray solution can be readily adjusted to the capacity of the hydraulic system of the tractor.

By mounting the agitator 47 on the end of the reciprocating plunger shaft 41 in the spray tank 49, the spray solution in this tank is continuously agitated and kept in uniform suspension.

From the above description and the disclosure in the drawings, it will be apparent the present invention provides a novel hydraulic spray pump comprising a driving or oil cylinder in which the oil under pressure is automatically supplied to one and then the other end of this cylinder, a common plunger shaft and a driven or spray cylinder mounted in alignment and having means for increasing the gallonage or volume output of a tractor hydraulic system by a mere change in the areas of said cylinders.

The present novel spray pump eliminates all connection with the power-take-off shaft of the tractor, operates without transfer of circular or oscillatory to linear motion and eliminates the pulsa-ting characteristics of a beltdriven or shaft-driven piston pump, but assures a continuous pumping operation. It provides a tractor driven spray pump of positive displacement, without bearings, rotating shafts, pulleys, connecting rods or wrist pins required with prior assemblies.

The present invention rthus provides a novel means and manner of harnessing the potential energy present in any hydraulic system for creating a variable spray volume discharge and pressure as desired or required in spraying.

laving thus disclosed the invention, we claim:

1. A spray pump operated by the energy lavailable in a hydraulic system of a tractor, comprising a spray tank containing a spray solution, a horizontally disposed spray cylinder extending into the spray tank with its opposite ends communicating with the contents of the spray tank, a separate horizontally disposed driving cylinder spaced yfrom said spray tank, a supporting frame between said tank and said driving cylinder, a common, continuously operating plunger shaft mounted in horizontal alignment with and for reciprocation in both said cylinders, a piston on said shaft within each of said cylinders with both pistons simultaneously reciprocated by said plunger shaft, agitating means in said tank actuated Iby said shaft for agitating the spray solution in the tank and maintain-ing any solids in suspension as said shaft is reciprocated, separate inlet ports and separate outlet ports at each end of said spray cylinder, inlet tubes communicating with said inlet ports and depending to adjacent the -bottom of said tank for withdrawing spray solution therefrom, nonreturn valves in eac-h inlet and outlet port, a common conduit connecting said outlet ports, a discharge line communicating with said common conduit, a reciprocating shuttle valve mounted -on said supporting frame and controlling the flow 0f oil from the hydraulic system of the tractor to said driving cylinder, and a tripping and reversing mechanism for said shuttle valve on said supporting frame including a collar on said common shaft, a fixed guide bar mounted in said supporting frame and extending parallel to the common shaft and provided with 'a sliding sleeve, spaced collars on the sleeve with one of said collars disposed at each side of the collar on the common shaft, said collar on said shaft contacting one 0f said collars on said sleeve as the shaft nears the extent of travel in one direction and contacting the other of said spaced collars as the shaft nears the extent of travel in the opposite direction, upstanding supports on said supporting frame having transversely extending stop bars, an upwardly extending lever pivotally mounted adjacent its lower end on said supporting frame and having its upper free end movable in an arc between said stop bars, a contractile spring connected to said lever adjacent its upper end and connected at its opposite end to said slidable sleeve, and a link connected at one end to said lever intermediate its pivot and its upper end and at its other end to said reciprocable shuttle valve so that upon engagement of said common shaft collar with one of said spaced collars said sleeve is moved to trip the lever and reverse the shuttle valve.

2. A lspray pump operated by the energy available in a hydraulic system of a tractor as set forth in claim l, in which a pressure relief valve communicates with `said common conduit, said relief valve including a housing, a spring-loaded Valve member normally seated within said housing, a pivoted manually actuated cam member controlling pressure exerted on said springloaded valve member, and a return conduit communieating with said housing above said valve member and with said spray tank.

References Cited in the le of this patent UNITED STATES PATENTS 116,572 Doyle July 1871 417,961 White Dec. 24, 1889 421,159 Broun Feb. 11, 1890 1,025,222 Wallace May 7, 1912 1,768,799 Stanley July 5, 1928 1,953,222 Gordon Apr. 3, 1934 2,460,004 Green et al. Jan. 25, 1949

Claims

1. A SPRAY PUMP OPERATED BY THE ENERGY AVAILABLE IN A HYDRAULIC SYSTEM OF A TRACTOR, COMPRISING A SPRAY TANK CONTAINING A SPRAY SOLUTION, A HORIZONTALLY DISPOSED SPRAY CYLINDER EXTENDING INTO THE SPRAY TANK WITH ITS OPPOSITE ENDS COMMUNICATING WITH THE CONTENTS OF THE SPRAY TANK, A SEPARATE HORIZONTALLY DISPOSED DRIVING CYLINDER SPACED FROM SAID SPRAY TANK, A SUPPORTING FRAME BETWEEN SAID TANK AND SAID DRIVING CYLINDER, A COMMON, CONTINUOUSLY OPERATING PLUNGER SHAFT MOUNTED IN HORIZONTAL ALIGNMENT WITH AND FOR RECIPROCATION IN BOTH SAID CYLINDERS, A PISTON ON SAID SHAFT WITHIN EACH OF SAID CYLINDERS WITH BOTH PISTONS SIMULTANEOUSLY RECIPROCATED BY SAID PLUNGER SHAFT, AGITATING MEANS IN SAID TANK ACTUATED BY SAID SHAFT FOR AGITATING THE SPRAY SOLUTION IN THE TANK AND MAINTAINING ANY SOLIDS IN SUSPENSION AS SAID SHAFT IS RECIPROCATED, SEPARATE INLET PORTS AND SEPARATE OUTLET PORTS AT EACH END OF SAID SPRAY CYLINDER, INLET TUBES COMMUNICATING WITH SAID INLET PORTS AND DEPENDING TO ADJACENT THE BOTTOM OF SAID TANK FOR WITHDRAWING SPRAY SOLUTION THEREFROM, NONRETURN VALVES IN EACH INLET AND OUTLET PORT, A COMMON CONDUIT CONNECTING SAID OUTLET PORTS, A DISCHARGE LINE COMMUNICATING WITH SAID COMMON CONDUIT, A RECIPROCATING SHUTTLE VALVE MOUNTED ON SAID SUPPORTING FRAME AND CONTROLLING THE FLOW OF OIL FROM THE HYDRAULIC SYSTEM OF THE TRACTOR TO SAID DRIVING CYLINDER, AND A TRIPPING AND REVERSING MECHANISM FOR SAID SHUTTLE VALVE ON SAID SUPPORTING FRAME INCLUDING A COLLAR ON SAID COMMON SHAFT, A FIXED GUIDE BAR MOUNTED IN SAID SUPPORTING FRAME AND EXTENDING PARALLEL TO THE COMMON SHAFT AND PROVIDED WITH A SLIDING SLEEVE, SPACED COLLARS ON THE SLEEVE WITH ONE OF SAID COLLARS DISPOSED AT EACH SIDE OF THE COLLAR ON THE COMMON SHAFT, SAID COLLAR ON SAID SHAFT CONTACTING ONE OF SAID COLLARS ON SAID SLEEVE AS THE SHAFT NEARS THE EXTENT OF TRAVEL IN ONE DIRECTION AND CONTACTING THE OTHER OF SAID SPACED COLLARS AS THE SHAFT NEARS THE EXTENT OF TRAVEL IN THE OPPOSITE DIRECTION, UPSTANDING SUPPORTS ON SAID SUPPORTING FRAME HAVING TRANSVERSELY EXTENDING STOP BARS, AN UPWARDLY EXTENDING LEVER PIVOTALLY MOUNTED ADJACENT ITS LOWER END ON SAID SUPPORTING FRAME AND HAVING ITS UPPER FREE END MOVABLE IN AN ARC BETWEEN SAID STOP BARS, A CONTRACTILE SPRING CONNECTED TO SAID LEVER ADJACENT ITS UPPER END AND CONNECTED AT ITS OPPOSITE END TO SAID SLIDABLE SLEEVE, AND A LINK CONNECTED AT ONE END TO SAID LEVER INTERMEDIATE ITS PIVOT AND ITS UPPER END AND AT ITS OTHER END TO SAID RECIPROCABLE SHUTTLE VALVE SO THAT UPON ENGAGEMENT OF SAID COMMON SHAFT COLLAR WITH ONE OF SAID SPACED COLLARS SAID SLEEVE IS MOVED TO TRIP THE LEVER AND REVERSE THE SHUTTLE VALVE.