US3425356A - Control system for concrete placer - Google Patents

Control system for concrete placer Download PDF

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Publication number
US3425356A
US3425356A US612839A US3425356DA US3425356A US 3425356 A US3425356 A US 3425356A US 612839 A US612839 A US 612839A US 3425356D A US3425356D A US 3425356DA US 3425356 A US3425356 A US 3425356A
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United States
Prior art keywords
valve
piston
line
cylinders
control system
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US612839A
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English (en)
Inventor
Richard H Mott
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Case LLC
Original Assignee
JI Case Co
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Filing date
Publication date
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Publication of US3425356A publication Critical patent/US3425356A/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B9/00Piston machines or pumps characterised by the driving or driven means to or from their working members
    • F04B9/08Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid
    • F04B9/10Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid
    • F04B9/109Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers
    • F04B9/117Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers the pumping members not being mechanically connected to each other
    • F04B9/1176Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers the pumping members not being mechanically connected to each other the movement of each piston in one direction being obtained by a single-acting piston liquid motor
    • F04B9/1178Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers the pumping members not being mechanically connected to each other the movement of each piston in one direction being obtained by a single-acting piston liquid motor the movement in the other direction being obtained by a hydraulic connection between the liquid motor cylinders
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B7/00Piston machines or pumps characterised by having positively-driven valving
    • F04B7/02Piston machines or pumps characterised by having positively-driven valving the valving being fluid-actuated
    • F04B7/0266Piston machines or pumps characterised by having positively-driven valving the valving being fluid-actuated the inlet and discharge means being separate members
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S417/00Pumps
    • Y10S417/90Slurry pumps, e.g. concrete

Definitions

  • the present invention is an improvement over the control system disclosed in U.S. Patent Nos.: 3,198,123 and 3,205,906, which show a pump and valve assembly having control valves, limit switches, and relays as the major components of the control system.
  • a description of the pump and valve assembly or of the concrete placer, as the unit is noW commonly called, is adequately disclosed in the above-mentioned patents and will not be repeated in detail in this specification.
  • the control system covered by the present invention is different from that in the above patents, and the principal object of this invention is to provide an improved control system for a concrete placer.
  • Another object is to provide a control system which assures a full stroke of the material delivery devices.
  • a further object is to provide a control system such that there is no backow of material during the pumping operation.
  • Another object is to provide a control system which compensates for system uid which may be lost through leakage.
  • An additional object is to provide a control system which purges the system itself of excess oil during the time that the delivery device is operating.
  • FIGURE l schematically illustrates the concrete pump with the present invention incorporated therein.
  • FIGURE 2 shows an enlarged sectional view of the iluid cylinder piston and relief valve.
  • the concrete placer generally includes a hopper to receive the material, a pair of delivery devices or cylinders, double-acting reciprocating in nature to move ice the material along a restricted path a prime mover for powering the delivery cylinders and associated mechanism, valve means for regulating the ilow of material into the path of the delivery pistons, control valves for controlling operation of the valves ⁇ means and the delivery cylinders, and a control system for properly coordinating the operation of the control valves in relation to the reciprocating cycle.
  • the concrete placer includes a pair of placement cylinders 20 and 22 having positioned therein placement pistons 24 and 26 connected to rods 28 and 30. Adjacent to and in line with cylinders 20 and 22 are hydraulic or power cylinders 32 and 34.
  • a hopper not shown, receives the material to be pumped or placed and this material is moved from the placement cylinders 20 and 22 to the left, as seen in the drawing, by the placement pistons.
  • the pistons 24 and 26 both discharge the material, which material is drawn through lines from the hopper, and then pumped into a common manifold and thence through a delivery line.
  • the pistons 24 and 26 are reciprocated within the cylinders 20 and 22, respectively, in such a manner that, as one piston moves to the right, the other moves in the opposite direction.
  • concrete or other slurry-type material is drawn from the hopper through either of the ports 36 and 38 into the respective placement cylinder.
  • a piston moves to the left, it pumps or discharges the material which has been drawn from the hopper on a previous back stroke. The material is then discharged out a port 40 or 42 into a common manifold, not shown.
  • rod 28 extends through a partition 44 connecting placement and power cylinders 20 and 32 and rod 30 extends through a partition 46 connecting cylinders 22 and 34.
  • Rod 28 is connected to a hydraulic or power piston 48 and rod 30 is connected to a power piston 50.
  • Cylinder 32 includes an end cap S2 and cylinder 34 has an end cap 54, which caps will be more fully described as a part of the invention.
  • a hydraulic pump 56 driven by a prime mover, not shown, delivers a quantity of pressurized uid into the system for powering of the pistons and for control purposes. Separate pumps may be used for these functions, as required by the particular system.
  • a placement control valve 58 is connected by hydraulic lines 60 and 62 to the upstream or piston end of power cylinders 32 and 34 respectively.
  • a line 61 connects pump 56 and valve 58.
  • a common line 64 connects the downstream or rod ends of cylinders 32 and 34, and a line 63 connects the pump 56 to line 64.
  • inlet and outlet valves Downstream of placement cylinders 20 and 22 are inlet and outlet valves which alternately open and close to control the ow of material out through ports 40 and 42.
  • the inlet valves 66 and 68 include cylinders 70 and 72 having rods 74 and 76 and pistons 78 and 80 actuated by hydraulic fluid which is controlled by a valve control valve 82.
  • the outlet or delivery valves 84 and 86 include cylinders 88 and 90 having rods 92 and 94 and pistons 96 and 98 actuated by the hydraulic uid and controlled by valve 82.
  • Valve 58 is a solenoid-controlled four-way valve and valve 82 is a solenoid-controlled, dual-stack, four-way valve. These valves are conventional type in that they have been utilized in the prior art, as shown in the abovementioned patents, and it is not necessary to further describe them in detail.
  • Control valve 82 is connected to the inlet and outlet valves by means of hydraulic lines as follows: Line 100 connects the downstream face of piston 78 to one side of valve 82, and to the -downstream face of piston 98; line 102 connects the upstream face of piston 78 to the upstream face of piston 98 and to one side of valve 82; line 104 connects the downstream face of piston 80 to one side of valve 82 and to the downstream face of piston 96; and line 106 connects the upstream face of piston 80 to the upstream face of piston 96 and to one side of valve 82.
  • the inlet valve of one materialcarrying line is hydraulically connected to the control valve 82 and to the outlet valve of the other material line, so that the-inlet and outlet valves work together in the control of admitting material and pumping the material out the ports and 42.
  • a pressure switch 108 is connected by a uid line 110 to the upstream face of piston 96 and a pressure switch 112 is connected by a fluid line 114 to the upstream face of piston 98. As the system pressure builds up in either of cylinders 88 or 90, the respective pressure switch is closed which actuates the valve solenoids.
  • hydraulic cylinder 32 has an end cap 52 which also provides a support for a valve actuator stud 128.
  • cylinder 34 has an end cap 54 and a stud 130.
  • Piston 48 includes a relief valve 132 and piston 50 has a relief valve 134. These relief valves are a part of the hydraulic 4slave system on the placement or delivery cylinders to assure that the cylinders maintain a full length stroke in the pumping cycle.
  • the valve actuator studs 128 and 130 extend through the end caps of the respective cylinders. As piston 50 moves to the right due to the force of the fluid on the downstream face of the piston, stud 130 contacts the valve 134 and relieves the pressure by allowing excess oil out through line 62.
  • the electrical circuit wiring includes a conventional battery 200 having its negative contact grounded with the positive contact connected through line 202 to the base of the two position switch 116.
  • the switch arm 116:1 is adapted to engage either contact for completing respective circuits to the solenoids on the respective valves.
  • the first contact 116b is connected through line 204 to the solenoid 58a forming a part of the valve 58.
  • the same contact of switch 116 is likewise connected through line 206 to both solenoids 82a and 82b of the dual-stack, four-way valve 82.
  • the solenoid 82a has its second contact grounded through line 208 while the solenoid 82b has its second contact connected through line 210 to contact 108a of the normally open pressure switch 108.
  • the same contact of the pressure switch 108 4 is also connected to the second contact of solenoid 58a through line 212.
  • the contact 116e of switch 116 is similarly connected to the remaining solenoids on the two valves.
  • line 220 connects contact 116C directly to a first contact on solenoid 58b of valve 58 while branch line 222 connects contact 116C to the first contact of the respective solenoids 82C and 82d.
  • the second contact of solenoid 82e ⁇ is again grounded through line 208 while the second contact of solenoid 82d is connected through line 224 to contact 112a of pressure switch 112.
  • Contact 112a of pressure switch 112 is likewise connected through line 226 to the second contact of solenoid 58h while the normally open pressure switch is grounded through yline 228.
  • one of the hydraulic pistons i.e., piston 48 is extended to the left in the drawing, and oil is forced from the downstream side of the piston through the slave line 64 to the downstream face of piston 50 causing it to retract or move to the right in the drawing.
  • oil from the pump 56 is forced through the constant volume valve 136 and into line 64 which adds to the amount of oil owing from cylinder 32.
  • This increased amount of oil causes piston 50 to retract at a slightly faster rate than piston 48 is being extended.
  • the valve actuator stud 130 contacts the relief valve 134 and moves it oi its seat, in this instance the relief valve including a ball is movable within the piston.
  • inlet valve 36 is closed and outlet valve 84 is open.
  • the material to be pumped passes from the hopper into the placement line but, of course, cannot ow back into the hopper.
  • inlet valve 38 is open so that material ows from the hopper into cylinder 22 and outlet valve 86 is closed to prevent material from returning through port 42 back into the placement cylinder.
  • the pressure switch 108 is closed, energizing the electrical circuits through the other solenoid 82b on valve 82 and solenoid 58a on valve 58 by grounding lines 210 and 212 connected to the respective solenoids on valve 82 and the solenoids on valve 58.
  • This operation then opens the opposite inlet and outlet valves and pressurizes the opposite placement piston thereby starting the next placement stroke.
  • a hydraulic control system for a double-acting reciprocating pump having a pair of power cylinders, flirst and second supply and delivery lines with iirst and second inlet valve means in respective supply lines and first and second outlet valve means in respective delivery lines, said power cylinders each having a piston reciprocating therein and each operatively connected to a supply line and a delivery line comprising; pressured iiuid supply means including a lirst valve selectively actuatable to supply cuid to extend one of said cylinders and retract the other of said cylinders and a second valve operatively connected to each said valve means for opening the first inlet valve means and closing the second outlet valve means while closing the other of said inlet valve means and opening the other of said outlet valve means, the improvement comprising means for controlling said 4iirst and second valves and including irst switch means actuatable by each of said power cylinders when said cylinders reach an eXtreme position, solenoid means on

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Fluid-Pressure Circuits (AREA)
US612839A 1967-01-31 1967-01-31 Control system for concrete placer Expired - Lifetime US3425356A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US61283967A 1967-01-31 1967-01-31

Publications (1)

Publication Number Publication Date
US3425356A true US3425356A (en) 1969-02-04

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Family Applications (1)

Application Number Title Priority Date Filing Date
US612839A Expired - Lifetime US3425356A (en) 1967-01-31 1967-01-31 Control system for concrete placer

Country Status (8)

Country Link
US (1) US3425356A (xx)
BE (1) BE709497A (xx)
DE (1) DE1653406C3 (xx)
DK (1) DK138278B (xx)
FR (1) FR1551724A (xx)
GB (1) GB1218092A (xx)
NL (1) NL6801392A (xx)
SE (1) SE331899B (xx)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2825144A1 (de) * 1978-06-08 1979-12-13 Schwing Gmbh F Mehrzylinderdickstoffpumpe

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8417539D0 (en) * 1984-07-10 1984-08-15 Dale Mansfield Ltd Pumping arrangements
GB2162590B (en) * 1984-07-10 1988-02-10 Dale Hydraulically driven pumps
DE4215403C2 (de) * 1991-05-16 2000-10-19 Mbt Holding Ag Zuerich Doppelkolbenpumpe zum Fördern von flüssigen Materialien, insbesondere von Beton oder Mörtel

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3279382A (en) * 1964-04-14 1966-10-18 Royal Industries Pump
US3327641A (en) * 1965-03-08 1967-06-27 Air Placement Equipment Co Inc Concrete pump
US3327634A (en) * 1965-08-30 1967-06-27 Whiteman Mfg Company Concrete pumping apparatus

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3279382A (en) * 1964-04-14 1966-10-18 Royal Industries Pump
US3327641A (en) * 1965-03-08 1967-06-27 Air Placement Equipment Co Inc Concrete pump
US3327634A (en) * 1965-08-30 1967-06-27 Whiteman Mfg Company Concrete pumping apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2825144A1 (de) * 1978-06-08 1979-12-13 Schwing Gmbh F Mehrzylinderdickstoffpumpe

Also Published As

Publication number Publication date
DE1653406C3 (de) 1975-08-28
NL6801392A (xx) 1968-08-01
GB1218092A (en) 1971-01-06
SE331899B (xx) 1971-01-18
DK138278B (da) 1978-08-07
BE709497A (xx) 1968-05-30
DK138278C (xx) 1979-01-29
DE1653406A1 (de) 1970-10-01
FR1551724A (xx) 1968-12-27
DE1653406B2 (de) 1975-01-23

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