EP1847710A1 - Hydrodynamisches System mit offenem Kreislauf für eine Kolbenbetonpumpe. - Google Patents

Hydrodynamisches System mit offenem Kreislauf für eine Kolbenbetonpumpe. Download PDF

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Publication number
EP1847710A1
EP1847710A1 EP06425273A EP06425273A EP1847710A1 EP 1847710 A1 EP1847710 A1 EP 1847710A1 EP 06425273 A EP06425273 A EP 06425273A EP 06425273 A EP06425273 A EP 06425273A EP 1847710 A1 EP1847710 A1 EP 1847710A1
Authority
EP
European Patent Office
Prior art keywords
hydraulic
cylinders
oleodinamic
pump
supply
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.)
Granted
Application number
EP06425273A
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English (en)
French (fr)
Other versions
EP1847710B1 (de
Inventor
Davide Cipolla
Pietro Chiesa
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COMPAGNIA ITALIANA FORME ACCIAIO S P A
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COMPAGNIA ITALIANA FORME ACCIAIO S P A
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Publication date
Application filed by COMPAGNIA ITALIANA FORME ACCIAIO S P A filed Critical COMPAGNIA ITALIANA FORME ACCIAIO S P A
Priority to AT06425273T priority Critical patent/ATE434130T1/de
Priority to DE602006007318T priority patent/DE602006007318D1/de
Priority to EP06425273A priority patent/EP1847710B1/de
Priority to DK06425273T priority patent/DK1847710T3/da
Priority to ES06425273T priority patent/ES2329714T3/es
Publication of EP1847710A1 publication Critical patent/EP1847710A1/de
Application granted granted Critical
Publication of EP1847710B1 publication Critical patent/EP1847710B1/de
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B15/00—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts
    • F04B15/02—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts the fluids being viscous or non-homogeneous
    • F04B15/023—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts the fluids being viscous or non-homogeneous supply of fluid to the pump by gravity through a hopper, e.g. without intake valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B7/00—Piston machines or pumps characterised by having positively-driven valving
    • F04B7/02—Piston machines or pumps characterised by having positively-driven valving the valving being fluid-actuated
    • F04B7/0233—Piston machines or pumps characterised by having positively-driven valving the valving being fluid-actuated a common distribution member forming a single discharge distributor for a plurality of pumping chambers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B7/00—Piston machines or pumps characterised by having positively-driven valving
    • F04B7/02—Piston machines or pumps characterised by having positively-driven valving the valving being fluid-actuated
    • F04B7/0233—Piston machines or pumps characterised by having positively-driven valving the valving being fluid-actuated a common distribution member forming a single discharge distributor for a plurality of pumping chambers
    • F04B7/0241—Piston machines or pumps characterised by having positively-driven valving the valving being fluid-actuated a common distribution member forming a single discharge distributor for a plurality of pumping chambers and having an oscillating movement
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
    • F04B9/08—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid
    • F04B9/10—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid
    • F04B9/109—Piston 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
    • F04B9/117—Piston 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
    • F04B9/1172—Piston 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 pump piston in the two directions being obtained by a double-acting piston liquid motor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
    • F04B9/08—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid
    • F04B9/10—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid
    • F04B9/109—Piston 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
    • F04B9/117—Piston 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
    • F04B9/1176—Piston 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
    • F04B9/1178—Piston 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

Definitions

  • the present invention refers to an open-circuit, oleodinamic system, with direct, automatic-sequence, driving system for the actuation and control of alternate-piston pumps, particularly of pumps for pumping concrete or other viscous materials.
  • said pumps are generally of the type comprising two cylindrical liners which receive the material to be pumped, within which slide corresponding pistons capable of pushing the viscous material along the liners.
  • Each of the above-mentioned pistons represents the working member of a hydraulic jack whose driving member is the piston of a corresponding hydraulic cylinder/piston assembly, the two pistons of each jack (the one moving in the liner and the one of the hydraulic cylinder) being mounted at the opposite ends of a same shaft.
  • the pump is operated by actuating the two hydraulic cylinders, so that the respective shafts may have an alternate, opposite-direction movement, so that while the piston in one of the pump liners is returning back and sucking viscous material into the liner, the other piston is simultaneously advancing, causing the expulsion of the material from the liner, i.e. precisely the desired pumping action.
  • An outflow deviation valve mechanism known in the field as S-valve, is used in combination with the shafts/pistons and in synchronisation with the movement thereof to achieve the alternate connection of the outlets of the liners through a hopper feeding the material to be pumped and, respectively, through the pump supply pipe, thereby guaranteeing a substantially constant exit flow of the pumped material (concrete).
  • Open-circuit oleodinamic systems are the most-frequently adopted ones due to their relative construction simplicity, easy finding of components, easy maintenance, and finally owing to the fact that repair operations, in case of malfunctioning, may be carried out also by non-qualified staff and with the basic equipment normally available on-board.
  • the automatic work sequences of open-circuit hydraulic systems are generally controlled by means of an auxiliary hydraulic circuit, capable of automatically switching between the two pistons the flow of pressurised fluid, on the basis of signals received from electric or preferably hydraulic limit devices, capable of detecting the displacement of the hydraulic pistons of the pump, precisely in the proximity of their top and bottom dead centres.
  • a first low-pressure type uses a fluid characterised by an auxiliary pressure, generally in the order of 40 bar;
  • a second type of such control circuits exploits instead the same supply pressure of the main control circuit of the hydraulic cylinders of the pump, and is therefore a high-pressure circuit, the pressure of which may reach for example 350 bar.
  • a deviation directional valve is installed, by means of which it is possible to directly invert supply and return to the distributors when one wants to change from one to the other of the work steps of the pump.
  • said deviation directional valve consists of a 4-way distributor capable of withstanding 350 bar at its four ports.
  • a hydraulic distributor of this type is not normally available on the market and it is hence necessary to provide to a specific design of the same.
  • This solution is hence not currently preferred, both due to its higher costs, but also because maintenance requirements make it far more practical and appealing for users to employ standard components which are easily available on the market.
  • switching between the intake and supply phases of the pump is instead achieved by inverting the flow direction in the driving lines from the hydraulic cylinders which actuate the concrete pump to the distributor of the deviation valve and in those from the cylinders of the deviation valve to the distributor of the pump cylinders.
  • This inversion is generally achieved in correspondence of the hydraulic supply distributors of said cylinders by means of two commercial-type electrovalves, normally installed for the sake of convenience on a single base block, which is in turn mechanically connected with its respective hydraulic distributor.
  • ports P, A, B are all suited to withstand the valve nominal pressure, for example 350 bar for the electrovalve type used in the systems described here.
  • Port T instead may generally withstand a pressure below 50% the nominal pressure of the valve, for example in this case a maximum pressure of 160 bar; such port cannot consequently be used to receive one of the flows of the working fluid which, as has been shown, can reach a pressure of 350 bar.
  • two coupled electrovalves must necessarily be used.
  • pumps may be used in combination with a distributor arm mounted on the same vehicle as the pump to supply concrete to medium-height buildings or to large raft foundations.
  • the distributor arm is detached from the pump-mounting vehicle and installed on a specific tower. In such case, the concrete pump must pump the concrete up to the distributor arm, through a suitably-installed connection pipe.
  • the concrete pump In the first case - characterised by modest heights and small hydraulic head losses on the pipe, which in fact is only the distributor arm one - the concrete pump is generally required to have a high flow rate and a relatively low pressure. In the second case - characterised by great heights and high head losses on the pipe, which in fact comprises also the connection pipe - the concrete pump on the contrary must develop a high pressure and a relatively low flow rate.
  • the main object of the present invention is hence to provide an oleodinamic system which allows to overcome the above-mentioned drawbacks, typical of the solutions known so far in the market.
  • a first object of the present invention is to provide an oleodinamic system for the actuation and control of an open-circuit piston pump for pumping concrete, and comprising automatic sequences for supply inversion driven by hydraulic distributors actuated by hydraulic stops, wherein the bulk of the electrovalve assemblies associated with said distributors is substantially reduced and the hydraulic connections thereof are simplified.
  • a second object of the present invention is to provide an oleodinamic system of the above-mentioned type, which further allows to switch the supply from the "shaft side" to the "piston side” very quickly and easily.
  • an oleodinamic system consists of: two main hydraulic cylinders 1 and 2, the pistons of which are rigidly connected with the pistons (not shown) which push the pumped viscous material (normally concrete) into the cylindrical liners of the pump; two hydraulic cylinders 3 and 4 which drive the movement of the distributor valve, by means of a lever S hinged in the centre of their shared shaft; a first mobile-cursor hydraulic valve 5 to supply hydraulic cylinders 1 and 2 of the pump; a second mobile-cursor hydraulic valve 6 to supply hydraulic cylinders 3 and 4 of the distributor valve; four electrovalves 7, 8, and 9, 10, for the remote-actuation of distributors 5 and 6, respectively, in the pumping and intake cycles; a hydraulic pump P for circuit supply; a pressure-limiting valve 11 with a respective electrovalve 12 connected to the drain, for the control and protection of the oleodinamic circuit; a filter F, generally installed on the drain; one-way valves 13 and logical seat valves 14
  • Fig. 2 shows an oleodinamic system according to the invention, wherein the components having the same function are referred to by the same numerals used in fig. 1.
  • the oleodinamic system according to the present invention also shares the general architecture of prior known systems as far as arrangement and hydraulic connections of the main hydraulic circuit are concerned, i.e. pump P and filter F, hydraulic cylinders 1 and 2 of the pump, hydraulic cylinders 3 and 4 of the distributor valve, hydraulic distributors 5 and 6.
  • electrovalves The structure of such electrovalves is diagrammatically shown in fig. 5, and is characterised by a larger number of inner compartments than that of conventional electrovalves, an example of which is shown in fig. 4.
  • said known electrovalves comprise five V-shaped inner compartments V, the central one V P , connected to pressure source P, being capable of being alternately put in communication with one of the two side compartments V A and V B connected to appliances A and B, respectively.
  • the two peripheral compartments V T are interconnected and connected to drain T, as well as being alternately put in communication with the one of the two compartments V A and V B which at that time is not in communication with compartment V P .
  • the shifting from the AP/BT connection to the AT/BP connection is achieved by sliding a cursor C whereon two cylindrical members R are formed with a double perimeter seal, capable of alternately seal one or the other of corresponding cylindrical seats which delimit the compartments V A e V B wherein the cylindrical members are housed.
  • the 5-way valve structure according to the present invention differs from the above-described one in that it comprises seven compartments V, rather than the five above-mentioned ones, as well as a cursor C equipped with four cylindrical sealing members R, of which the end ones R Y are twofold. From a functional point of view, the 5-way valve of the invention repeats, in the five central compartments VP, VA, VB and VT the same function of the above-described, known-type 4-way valve. Unlike the conventional electrovalve, however, compartments V T are divided from the chamber of solenoid D and from that of return spring M by twofold cylindrical sealing members R Y which are in permanent sealing contact with the cylindrical seats which delimit the two outmost valve compartments V Y . Such compartments are further interconnected and communicate with the drain branch by a drainage channel Y formed in hydraulic distributors 5 and 6, to drain the excess oil which leaks into the same from adjacent compartments V T .
  • port T can operate at the maximum nominal pressure, being in fact divided from the chambers of solenoid D and from return spring M by the two pairs of inner cylindrical sealing members R Y which bear in a symmetrical and balanced way the pressure received through cursor C and allow to maintain a higher working pressure in ports A,B, P and T and a reduced allowable pressure in the outer chambers of solenoid D and of return spring M.
  • the different connections required by hydraulic distributors 5 and 6 can hence be performed by the only above-mentioned electrovalve member 15, 16, with significant advantages from the point of view of the streamlining of the electrical and hydraulic systems which, in the prior art, are necessary to accomplish the correct connection between the two 4-way electrovalves which actuate each hydraulic distributor.
  • electrovalves 15 and 16 have three out of their five ports arranged on a plane machined according to ISO/CETOP 03 rule suited to be arranged matching a similar plane of the hydraulic distributors, so that there are only two outstanding connections to be set up, through pipes outside the block formed by the electrovalve and by its respective distributor.
  • the components of the 5-way electrovalves which are different from cursor C are identical to the ones of the commercial 4-way electrovalves, so as to reduce the cost and to ease maintenance thereof.
  • the hydraulic circuit driving hydraulic cylinders 1 and 2 which actuate the pump is accomplished in a symmetrical way to a plane transversal to the centreline of the two cylinders arranged side by side, rather than to a plane parallel to the axes of the cylinders and arranged between the same.
  • both cylinders 1 and 2 are equipped with an identical control circuit
  • each cylinder is equipped with a control circuit identical at the two ends thereof and different from the one of the adjacent cylinder.
  • the first hydraulic cylinder 1 is equipped at its two opposite ends with two one-way valves 13a and 13b, capable of automatically guaranteeing the synchronism of the pumping cylinders
  • the second cylinder 2 is equipped at its two opposite ends with two logical seat valves 14a and 14b, preferably gathered in a single small block, capable of actuating the flow inversion of hydraulic distributor 6 of cylinders 3 and 4 of the deviation valve.
  • Flow inversion of distributor 5 of hydraulic cylinders 1 and 2 of the pump is instead actuated by means of two driving lines coming from the cylinders of the deviation valve which run through a mechanical-switching, 4-way valve 17.
  • the above-described hydraulic circuit allows to effect the regular flow inversion to pump cylinders 1 and 2 and to cylinders 3 and 4 of the deviation valve without the need to overfeed the slave circuit as occurred in the previous state of the art, thanks to the fact that two one-way valves 13a and 13b are provided, of which one replenishes oil to the slave circuit and the other drains oil from the slave circuit, automatically maintaining the synchronism of the pumping cylinders.
  • Two further one-way valves 18, arranged on bypass branches which connect the driving branches of hydraulic distributor 6 (coming from valves 14) with the supply branches of cylinders 1 and 2 of the pump, provide to alternately drain a driving branch on the supply branch of cylinders 1 and 2 which is alternately in communication with drainage (T).
  • T drainage

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Fluid-Pressure Circuits (AREA)
  • On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
EP06425273A 2006-04-20 2006-04-20 Hydrodynamisches System mit offenem Kreislauf für eine Kolbenbetonpumpe. Active EP1847710B1 (de)

Priority Applications (5)

Application Number Priority Date Filing Date Title
AT06425273T ATE434130T1 (de) 2006-04-20 2006-04-20 Hydrodynamisches system mit offenem kreislauf für eine kolbenbetonpumpe.
DE602006007318T DE602006007318D1 (de) 2006-04-20 2006-04-20 Hydrodynamisches System mit offenem Kreislauf für eine Kolbenbetonpumpe.
EP06425273A EP1847710B1 (de) 2006-04-20 2006-04-20 Hydrodynamisches System mit offenem Kreislauf für eine Kolbenbetonpumpe.
DK06425273T DK1847710T3 (da) 2006-04-20 2006-04-20 Forbedret oleodynamisk system med bent kredsläb til at aktivere og styre en stempelpumpe til beton
ES06425273T ES2329714T3 (es) 2006-04-20 2006-04-20 Sistema oleodinamico de circuito abierto mejorado para accionar y controlar una bomba de piston de hormigon.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP06425273A EP1847710B1 (de) 2006-04-20 2006-04-20 Hydrodynamisches System mit offenem Kreislauf für eine Kolbenbetonpumpe.

Publications (2)

Publication Number Publication Date
EP1847710A1 true EP1847710A1 (de) 2007-10-24
EP1847710B1 EP1847710B1 (de) 2009-06-17

Family

ID=36992646

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06425273A Active EP1847710B1 (de) 2006-04-20 2006-04-20 Hydrodynamisches System mit offenem Kreislauf für eine Kolbenbetonpumpe.

Country Status (5)

Country Link
EP (1) EP1847710B1 (de)
AT (1) ATE434130T1 (de)
DE (1) DE602006007318D1 (de)
DK (1) DK1847710T3 (de)
ES (1) ES2329714T3 (de)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1192657A (en) * 1968-01-03 1970-05-20 Jaeger Machine Co Electric Control Circuit and Hydraulic System for Concrete Pumping Apparatus
US3994627A (en) * 1973-11-16 1976-11-30 Fogt Industriemaschinenvertretung A.G. Pumping apparatus for wet concrete
EP0167635A1 (de) * 1984-06-05 1986-01-15 COMPAGNIA ITALIANA FORME ACCIAIO S.p.A. Hydraulischer Kreislauf für Pumpen mit hin- und hergehenden Kolben

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1192657A (en) * 1968-01-03 1970-05-20 Jaeger Machine Co Electric Control Circuit and Hydraulic System for Concrete Pumping Apparatus
US3994627A (en) * 1973-11-16 1976-11-30 Fogt Industriemaschinenvertretung A.G. Pumping apparatus for wet concrete
EP0167635A1 (de) * 1984-06-05 1986-01-15 COMPAGNIA ITALIANA FORME ACCIAIO S.p.A. Hydraulischer Kreislauf für Pumpen mit hin- und hergehenden Kolben

Also Published As

Publication number Publication date
DE602006007318D1 (de) 2009-07-30
DK1847710T3 (da) 2009-09-07
ATE434130T1 (de) 2009-07-15
EP1847710B1 (de) 2009-06-17
ES2329714T3 (es) 2009-11-30

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