EP2243965B1 - Oszillierender Druckmittelzylinder für Betonpumpen mit hydraulisch angetriebener Zahnstangeneinheit - Google Patents

Oszillierender Druckmittelzylinder für Betonpumpen mit hydraulisch angetriebener Zahnstangeneinheit Download PDF

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Publication number
EP2243965B1
EP2243965B1 EP20100160544 EP10160544A EP2243965B1 EP 2243965 B1 EP2243965 B1 EP 2243965B1 EP 20100160544 EP20100160544 EP 20100160544 EP 10160544 A EP10160544 A EP 10160544A EP 2243965 B1 EP2243965 B1 EP 2243965B1
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Prior art keywords
box
gasket
way
rack
actuator
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EP20100160544
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English (en)
French (fr)
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EP2243965A2 (de
EP2243965A3 (de
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Giancarlo Musiani
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/02—Mechanical layout characterised by the means for converting the movement of the fluid-actuated element into movement of the finally-operated member
    • F15B15/06—Mechanical layout characterised by the means for converting the movement of the fluid-actuated element into movement of the finally-operated member for mechanically converting rectilinear movement into non- rectilinear movement
    • F15B15/065—Mechanical layout characterised by the means for converting the movement of the fluid-actuated element into movement of the finally-operated member for mechanically converting rectilinear movement into non- rectilinear movement the motor being of the rack-and-pinion type

Definitions

  • the invention relates to apparatus for pumping concrete, mortar or other liquid products, which may be dense or incoherent, over a distance, the apparatus comprising a hopper into which the concrete for pumping is placed, the hopper containing in its lower part a gooseneck pipe, one end of which is connected to the concrete removal pipe and made to rotate in an alternating way by an external oscillatory actuator, while the other end oscillates in a pendulum-like way and alternately contacts two apertures to which corresponding reciprocating single-acting pump units, driven by corresponding hydraulic actuators, are permanently connected.
  • the other pump unit is in the phase in which the concrete drawn in previously is discharged through said gooseneck pipe which is in contact with it.
  • An actuator of this type comprises a rack which is driven at its ends by hydraulic cylinder and piston units and which engages with a ring gear fixed on one of the two ends of the oscillation shaft of said gooseneck pipe.
  • the gear is housed in an oil bath in a box-like body in which are formed the opposing chambers in which the end pistons of the rack slide in a sealed way, with attached hydraulic dampers for limiting the stroke.
  • the projection of these chambers is limited, and the box-like body which contains them is provided with external cooling fins at the positions of the chambers.
  • US 5323690 discloses a linear movable apparatus for imparting rotational movement to a turntable.
  • the turntable is secured to a rotatably mounted shaft having a ring gear thereon for meshed engagement with gear teeth provided on a piston rod which extends between a pair of pistons.
  • Each piston is reciprocally carried in aligned cylinder housings mounted in a support structure.
  • An adjustable mechanism is provided for retaining the piston rod in snug-fitting relation with the ring gear, and a bracket assembly is secured around the ring gear to support the adjustable mechanism against the ring gear.
  • the actuator comprises a box-like body 1 formed from a single piece made by casting a suitable metal alloy in a mould with a core box, or by any other suitable method.
  • the body 1 takes the form of an octagon elongated on the horizontal plane, with a curved and upwardly convex upper side 101 and with symmetrical horizontal parallelepipedal extensions 201, 201' at the opposite ends.
  • Wear liners 5, 5' are inserted with a lateral seal by means of gaskets 4, 4' into the tubes 2, 2' with a high degree of precision, each liner being provided on its outer end with a small outer collar 105, 105' which is housed in a corresponding recess of the flange 102, 102', the cylindrical projection 107, 107' of a cap 7, 7' being inserted into each liner in a sealed way by means of the gaskets 6, 6', each cap also having a square base and being provided in its corner areas with through holes of stepped section to allow the passage of the shanks of screws which are indicated schematically by 8, 8' and to contain the heads of these screws, which fix the parts 2, 7 and 2', 7' to the extensions 201, 201' of the body 1 with the interposition of the corresponding wear liners 5, 5'.
  • the end pistons 110, 110' of the rack 10 slide with a lateral seal, provided by means of the gaskets 9, 9', in these liners, the rack having an exposed portion, between the guide parts 2, 5 and 2', 5', which interacts with a ring gear 11 which is described more fully below.
  • the shanks 207, 207' are axially hollow and have threaded holes 12, 12' opening on the caps 7, 7', to which it is possible to connect the pipes of the hydraulic circuit for driving the actuator, these pipes having alternating delivery and discharge functions, to provide the desired reciprocating motion of the rack 10.
  • the body 1 has, below the rack and the guide parts for the corresponding pistons, a wide bowl-shaped chamber 13, which can contain a large quantity of oil and whose base wall 301 is suitably distant from said rack, in such a way that any impurities due to the wear of the parts are collected on this base wall in a position remote from the moving parts, with the consequent advantages.
  • the wall 301 is provided with a hole with a sealing plug 14, which can be removed in order to discharge all the oil contained in the body 1, together with the impurities, for the periodic replacement of the internal lubricating oil of the actuator, the level of the oil being subsequently restored through feed, overflow and/or inspection holes 15, 15' provided in the body 1 at a level above the tubes 2, 2'.
  • the box-like body 1 is provided externally, in its upper part, with two symmetrical lateral appendages 401, 401' with holes 16, 16' for the passage of corresponding fixing screws, while in its lower part the body 1 has inner parts 501, 501' of increased thickness in which through holes 17, 17' are formed, these holes also being adapted for the passage of fixing screws.
  • the outer front surface of the body 1 is provided with suitable heat exchange fins 18, as shown in part in Figure 2 , to improve the dissipation of the heat produced by the reciprocating movement of the rack and by its interaction with the ring gear 11.
  • the box-like body 1 is provided on opposite faces with apertures 601, 601' which are machined on their inner diameters in such a way that they are aligned axially with each other and which contain low friction rings 19, 19' which are in close contact with them, the rings being made, for example, from suitable plastic material or appropriate sintered material and being capable of supporting rotatably the end portions of a steel sleeve 111, which carries the ring gear 11 which is made in one piece with it or is fitted on it, and whose ends project from the body 1 in the form of a rear portion 211, having an outer gasket 20 for connection to the tubing for removing the pumped concrete, and a front portion 311 1 which can be fixed, with the interposition of a sealing gasket 22, to a sleeve 21 whose other end is adapted to be fixed and connected in a sealed way by means of a gasket 23 to the end of the gooseneck pipe CC which is to be made to oscillate by the actuator in question within the
  • the aforesaid support rings 19, 19' are provided, on their inner surfaces in contact with the sleeve 111, with lubrication grooves which allow a sufficient degree of outward permeation of some of the lubricating oil which is contained in the body 1, for which reason suitable means are provided outside the apertures 601, 601' of the body 1 to prevent leaks of said lubricating oil.
  • the rear aperture 601 is provided with a projecting collar 701 which forms an inner annular chamber 24 in which is inserted an internal gasket of metal and rubber which comprises a metal ring 25 for contacting the ring 19 and a part 125 made from elastomeric material, with a C-shaped profile and an internal spring, which interacts with the outer lateral surface of the portion 211 of the aperture 111 to form a lateral seal.
  • a projecting collar 701 which forms an inner annular chamber 24 in which is inserted an internal gasket of metal and rubber which comprises a metal ring 25 for contacting the ring 19 and a part 125 made from elastomeric material, with a C-shaped profile and an internal spring, which interacts with the outer lateral surface of the portion 211 of the aperture 111 to form a lateral seal.
  • annular cap 27 is then mounted on said collar 701 in a sealed way by means of the gasket 26, this cap interacting in a sealed way with the portion 211 of the aperture 111 by means of a gasket 126 on its inner diameter, and being provided externally with a pair of diametrically opposite lugs 127 which can be fixed with screws 28 to corresponding outer thickened areas 801 of the body 1.
  • the front aperture 601' is machined on its outer diameter in such a way that it has a collar 901 which is mounted, with a sealing gasket 29, in a hole 30 formed in the rear plate P of the hopper T, and which terminates in said hopper with a portion 130 of smaller diameter, to retain in said hole 30 a composite metal and rubber gasket, with an outer ring 31 made from metal and with an inner annular insert 131 made from a suitable elastomeric material, with interacts in a sealed way with the outer lateral surface of the sleeves 111 and 21.
  • the metal ring 31 is provided with a plurality of radial holes 32 which communicate with both inner and outer annular manifolds, indicated by 132, the outer of which communicates with a pipe 33 formed in the plate P and leading to a connector 34 which is connected to a source of pressurized air (not shown) to pressurize the rubber part 131 of the gasket in a centripetal way, in order to maintain the best possible contact of the gasket with the sleeves 111, 21, and in order to prevent the ingress of liquid and dirt into the box-like body 1 if this gasket becomes worn.
  • a flowmeter or any suitable means or sensor for indicating an anomalous flow of air towards the sealing gasket 31, 131 can be connected to the connector 34, to provide a warning when this gasket needs to be replaced.
  • the actuator described herein is highly reliable, is easy to construct and to maintain by both routine and extraordinary procedures, and has a long service life, in part due to the fact that the actuator can be completely restored and returned to its best operating condition by periodically changing the wear liners 5, 5' and the piston rings and sealing gaskets 9, 9' of the pistons 110, 110' of the rack, and by periodically changing the phase of the ring gear 11 with respect to the rack 10.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Transmission Devices (AREA)
  • On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
  • Reciprocating Pumps (AREA)
  • Actuator (AREA)

Claims (6)

  1. Ein oszillierender Druckmittelzylinder für Pumpen für Beton oder andere dichte oder inkohärente flüssige Produkte, mit einer Zahnritzel- oder Zahnkranzeinheit (11), welche mit dem Ende des gekröpften Rohrs (CC) verbunden werden kann, der sich abwechselnd in beide Richtungen drehen soll und der mit einer Zahnstangeneinheit (10) interagiert, welches hydraulisch durch das abwechselnde Gleiten seiner Endkolben (110, 110') in abgedichteten Kammern angetrieben wird, die in einem kastenförmigen Körper (1) des Druckmittelzylinders gebildet werden, welcher die Zahnstangeneinheit enthält worin die Endkolben der Zahnstangeneinheit, mit ihren Kolbenringen und seitlichen Dichtungen (9, 9'), gleitbar in Verschleißlaufbuchsen (5, 5') laufen, welche abgedichtet mit entsprechenden Dichtungen (4, 4') in robusten Röhren (2, 2') montiert sind, die mit ihren Dichtungselementen (3, 3') in axial ausgerichteten Sitzen (201, 201') des genannten kastenförmigen Körpers befestigt sind, und zwar zusammen mit den entsprechenden Kappen (7, 7'), welche jeweils dicht mit den genannten Laufbuchsen interagieren und Öffnungen (12, 12') zur Verbindung mit den Rohren des hydraulischen Antriebskreises aufweisen, wobei diese Rohre jeweils abwechselnd Abgabe- und Entladungsfunktionen haben, und der genannte kastenförmige Körper (1) an jeweils zwei seiner gegenüberliegenden Seiten mit runden Öffnungen (601, 601') ausgestattet ist, die derartig verarbeitet sind, dass sie jeweils axial miteinander ausgerichtet sind und in engem Kontakt Ringe (19, 19') mit niedriger Reibung beherbergen, welche drehbar Endabschnitte einer Stahlhülse (111) halten, die den Zahnritzel oder den Zahnkranz (11) trägt, der einteilig damit beziehungsweise darauf montiert ist, und dessen Enden von dem genannten Körper in Richtung der Rückseite vorstehen, und zwar in Form eines Abschnitts (211) zwecks entsprechender Verbindung mit der Rohrleitung zur Entfernung des gepumpten Betons, und in Richtung der Vorderseite in Form eines Abschnitts (311), der bei Zwischenschaltung von Dichtelementen (22) an einer Muffe (21) befestigt werden kann, deren anderes Ende jeweils so angepasst ist, dass es dicht an dem Ende des gekröpften Rohrs (CC) verankert werden kann, welches durch den genannten Druckmittelzylinder im Innern des Trichters (T) zum Schwingen gebracht werden soll, dadurch gekennzeichnet, dass die genannten Halteringe (19, 19') an ihren inneren Oberflächen, die in Berührung mit der Muffe (111) stehen, mit Schmierrillen ausgerüstet sind, welche eine ausreichende äußerliche Durchdringung mit einer bestimmten Menge des Schmieröls gestatten, das im kastenförmigen Körper (1) enthalten ist, wobei die Öffnungen (601, 601') dieses Körpers mit Dichtungselementen ausgestattet sind, die jeweils an der äußeren seitlichen Oberfläche der genannten Muffe (111) tätig sind.
  2. Ein Druckmittelzylinder gemäß Anspruch 1, wobei der genannte kastenförmige Körper (1) aus einem Stück hegestellt wird, und zwar durch den Guss einer entsprechenden Metalllegierung in einer Form mit einem Kernkasten oder mit einer gleichwertigen Methode, und zwar so, dass der genannte kastenförmige Körper von vorne gesehen beispielsweise die Form eines auf horizontaler Ebene gestreckten Achtecks aufweist, mit einer gebogenen und äußerlich konvexen Oberseite (101), um eine Gehäuse zu bilden, das in der Lage ist, den Zahnkranz (11) aufzunehmen, wobei dieser Körper symmetrische waagerechte Parallelepiped Ausdehnungen (201, 201') an den gegenüberliegenden Enden aufweist, in denen die Sitze zur Unterbringung der genannten Röhren (2, 2') gebildet sind, mit den inneren Laufbuchsen (5, 5') und den genannten Abdeckklappen (7, 7'), und dieser kastenförmige Körper (1) so beschaffen ist, dass er unter der Zahnstangeeinheit und den Teilen zur Führung der entsprechenden Kolben eine größere Kammer oder ein Becken (13) aufweist, das eine erhebliche Menge Öl enthalten kann, welches jeweils den Pegel der entsprechenden Speise- und Inspektionsöffnungen erreicht, die im Körper (1) auf einer bestimmten Höhe oberhalb der genannten Röhren (2, 2') vorgesehen sind, wobei die Sockelwand (301) des genannten Beckens einen Abflussstopfen (14) aufweist und sich jeweils in angemessener Entfernung von der genannten Zahnstangeeinheit befindet.
  3. Ein Druckmittelzylinder gemäß den vorausgegangenen Ansprüchen, dadurch gekennzeichnet, dass der genannte kastenförmige Körper (1) zwecks Befestigung zum Gebrauch zwei äußere seitliche, symmetrische Anhänger (401, 401') an seinem oberen Bereich mit Öffnungen (16, 16') zum Durchstecken entsprechender Feststellschrauben aufweist, während sich im unteren Bereich des Körpers (1) Teile verstärkter Dicke (501, 501') befinden, in denen sich wiederum entsprechende durchgehende Bohrungen (17, 17') befinden, welche ebenfalls zum Durchstecken von Feststellschrauben verwendet werden können.
  4. Eine Ausrüstung gemäß Anspruch 1, bei der die rückseitige Öffnung (601) des kastenförmigen Körpers (1) mit einem vorstehenden Kragen (701) ausgestattet ist, welcher eine ringförmige Kammer (24) bildet, die Dichtungselemente (25, 125) beherbergt, welche jeweils mit der äußeren seitlichen Oberfläche des rückseitigen Abschnitts (211) der genannten Öffnung interagieren, wobei eine ringförmige Kappe (27) außen dicht auf den Kragen (701) montiert ist, und die Kappe jeweils eine Dichtung (126) an ihrem inneren Durchmesser aufweist, die mit dem rückseitigen Abschnitt (211) der Muffe (111) interagiert und die außen mit Elementen (127) zur Arretierung mit Schrauben (28) an entsprechenden Anschlussstücken (801) des kastenförmigen Körpers versehen ist.
  5. Ein Druckmittelzylinder gemäß Anspruch 1, bei dem die vordere Öffnung (601') des kastenförmigen Körpers (1) auch an seinem äußeren Durchmesser so verarbeitet ist, dass er einen entsprechenden Kragen (901) aufweist, welcher jeweils dicht in eine Bohrung (30) montiert ist, die sich an der hinteren Platte (P) des Trichters (T) befindet und die innerhalb des Trichters in einem Abschnitt (130) mit geringerem Durchmesser endet, welcher in der Bohrung (30) jeweils eine Verbund-Runddichtung mit einem äußeren Metallring (31) und mit einem inneren ringförmigen Einsatz (131) zurückhält, der aus einem entsprechenden Elastomer Material besteht, der dicht mit der äußeren seitlichen Oberfläche der Öffnungen (111, 21) interagiert und der durch Rohre (32, 132), die in dem genannten Ring (31) gebildet werden, und durch andere (33, 34), die sich in der genannten Platte (P) befinden, mit einer entsprechenden Druckluftquelle verbunden werden kann, die das Gummiteil (131) der genannten Runddichtung zentripetal unter Druck setzt, um den bestmöglichen Kontakt der Runddichtung mit den inneren Muffen beizubehalten, und um das Eintreten von Flüssigkeit und Schmutz in den kastenförmigen Körper (1) zu verhindern, wenn diese Runddichtung verschleißt.
  6. Ein Druckmittelzylinder gemäß Anspruch 5, bei dem ein Durchflussmengenmesser oder ein beliebiges anderes entsprechendes Element beziehungsweise ein Sensor zur Angabe eines anormalen Luftstroms in Richtung der Runddichtung (31, 131) jeweils mit dem Anschlussstück (34) verbunden werden kann, und welcher Druckluft an die genannte Runddichtung liefert, um für eine entsprechende Warnung zu sorgen, wenn diese Runddichtung ersetzt werden muss.
EP20100160544 2009-04-22 2010-04-21 Oszillierender Druckmittelzylinder für Betonpumpen mit hydraulisch angetriebener Zahnstangeneinheit Active EP2243965B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITBO20090024 ITBO20090024U1 (it) 2009-04-22 2009-04-22 Attuatore di movimento oscillante, per pompe da calcestruzzo, con gruppo a pignone e cremagliera mosso idraulicamente.

Publications (3)

Publication Number Publication Date
EP2243965A2 EP2243965A2 (de) 2010-10-27
EP2243965A3 EP2243965A3 (de) 2013-10-09
EP2243965B1 true EP2243965B1 (de) 2015-03-25

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EP20100160544 Active EP2243965B1 (de) 2009-04-22 2010-04-21 Oszillierender Druckmittelzylinder für Betonpumpen mit hydraulisch angetriebener Zahnstangeneinheit

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EP (1) EP2243965B1 (de)
IT (1) ITBO20090024U1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2976983B1 (fr) 2011-06-27 2013-06-21 Ksb Sas Actionneur a quart tournant a pignon non cylindrique et cremaillere complementaire

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3245271A (en) * 1962-01-08 1966-04-12 Central States Tooling Service Hydraulic actuator
US3209541A (en) * 1963-07-29 1965-10-05 William P Dunphy Hydraulic remote control apparatus
US3834284A (en) * 1973-04-05 1974-09-10 Deere & Co Hydraulic steering for tractors and like vehicles
IT223832Z2 (it) 1990-03-30 1995-10-03 Distributore oscillante per pompe da calcestruzzo, azionato da un complesso a pignone-cremagliera mosso idraulicamente.
US5353690A (en) * 1993-03-04 1994-10-11 Shin Guo S Actuator type reciprocating mechanism
US5323690A (en) * 1993-03-05 1994-06-28 Sims James O Fluid actuator assembly for imparting rotational movement to a boom

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Publication number Publication date
ITBO20090024U1 (it) 2010-10-23
EP2243965A2 (de) 2010-10-27
EP2243965A3 (de) 2013-10-09

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