EP3224430B1 - Boom for a working machine and method for producing same - Google Patents

Boom for a working machine and method for producing same Download PDF

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Publication number
EP3224430B1
EP3224430B1 EP15800864.9A EP15800864A EP3224430B1 EP 3224430 B1 EP3224430 B1 EP 3224430B1 EP 15800864 A EP15800864 A EP 15800864A EP 3224430 B1 EP3224430 B1 EP 3224430B1
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EP
European Patent Office
Prior art keywords
boom
sealing
partition wall
sealing groove
seal
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.)
Not-in-force
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EP15800864.9A
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German (de)
French (fr)
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EP3224430A1 (en
Inventor
Dietmar FÜGEL
Christian Hahn
Matthias Braun
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Putzmeister Engineering GmbH
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Putzmeister Engineering GmbH
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Publication of EP3224430A1 publication Critical patent/EP3224430A1/en
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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
    • E04G21/02—Conveying or working-up concrete or similar masses able to be heaped or cast
    • E04G21/04—Devices for both conveying and distributing
    • E04G21/0418—Devices for both conveying and distributing with distribution hose
    • E04G21/0445—Devices for both conveying and distributing with distribution hose with booms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
    • B66C23/54—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes with pneumatic or hydraulic motors, e.g. for actuating jib-cranes on tractors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
    • B66C23/62—Constructional features or details
    • B66C23/64—Jibs
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
    • E04G21/02—Conveying or working-up concrete or similar masses able to be heaped or cast
    • E04G21/04—Devices for both conveying and distributing
    • E04G21/0418—Devices for both conveying and distributing with distribution hose
    • E04G21/0436—Devices for both conveying and distributing with distribution hose on a mobile support, e.g. truck
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
    • E02F3/36—Component parts
    • E02F3/38—Cantilever beams, i.e. booms;, e.g. manufacturing processes, forms, geometry or materials used for booms; Dipper-arms, e.g. manufacturing processes, forms, geometry or materials used for dipper-arms; Bucket-arms
    • E02F3/382—Connections to the frame; Supports for booms or arms

Definitions

  • the present invention seeks to further improve the known in the art mast arms and Masther thoroughlysclar and to provide a manufacturing technology simple and reliable seal even in hard to reach areas and thus to enable optimization of the mast construction.
  • the invention is based on the idea to use a sealing profile instead of a cohesive seal by welds. Accordingly, the invention proposes that the sealing bulkhead assembly has a bulkhead, which is provided on its peripheral side with an at least partially and preferably completely circumferential sealing groove, and that in the sealing groove, an elastic seal is arranged, which rests tightly against the adjacent side walls inside.
  • a profiled seal running in a groove-like seat it is also possible to seal off areas in which, owing to lack of space and / or due to notch effect, no welding can be carried out.
  • the arm profile can be made filigree and does not have to be built for reasons of accessibility larger and thus heavier than actually necessary.
  • the arm structures which previously required thicker sheets or doublings, could be made lighter.
  • the seal is preferably formed by a introduced into the seal groove informal sealant from a polyurethane sealant. In this way, welds in prefabrication do not damage the seal and allow accurate contour matching to compensate for tolerances.
  • a runner in a preferably formed by a belt side wall or in the bulkhead running sprue for introducing sealant in the seal groove.
  • the bulkhead positioned in the section to be sealed is prefixed by a material, positive or frictional connection to at least one side wall in a desired position.
  • connection point between the bulkhead and a side wall of the box section is arranged centrally in the side wall in the region of the neutral fiber.
  • the bulkhead is formed as adapted to the sealed cross-sectional contour, in particular square plate made of metal. Also conceivable is the use of plastic moldings as a bulkhead.
  • the bulkhead is constructed in multiple layers, wherein the lateral outer layers form the groove flanks of the sealing groove.
  • the box section is formed of two opposing webs and two outboard resting on the longitudinal edges of the webs straps.
  • previously welded bulkhead are provided in the joint area, which can be replaced by the inventive solution kerbein.
  • a particularly advantageous use results from the fact that the sealing bulkhead assembly seals a hinge point on the end portion of a mast arm against access of corrosive media.
  • a preferred measure provides that the bulkhead is prefixed in the cross section to be sealed by welding or stapling, clamping, screwing, stops or grooves. Then it is advantageous if a formless sealant is introduced into the seal groove and cured therein to form the seal. In this context, it is also advantageous if the sealing groove is filled with a sealing compound via a feed channel accessible from outside the mast arm in a side wall or in the bulkhead wall.
  • truck concrete pump 10 includes a road vehicle 12 and a transportable thereon Betonverteilermast 14 with multiple mast arms 16 which are connected via articulated joints 18 and by means of hydraulic actuators 20 at the articulated joints 18 are mutually pivotable, so that guided along the mast 14 Concrete delivery line 22 with its end hose is variably positioned in a workspace.
  • Fig. 2 shows two mast arms 16, 16 'of the arm package after Fig. 1 , which are hinged together at their bent forked ends via an articulation 18.
  • a hydraulic cylinder is provided as a pivot drive 20, which is articulated on the bottom side via a hinge point 24 on a mast arm 16 and the rod side engages over a deflection linkage 26 near the articulated joint 18 at both ends of the mast.
  • the turning linkage 26 comprises a pair of turning levers 28 engaging externally on the mast arm end of one mast arm 16 and a pair of push rods 30 engaging the open clevis portion of the other mast arm end. These are mounted on a hinge pin 32 which defines the cavity portion 34 at the fork ends of the mast arm 16 'penetrating hinge point 36 forms.
  • the concrete conveyor line 22 can be relatively narrow past the mast arm 16 'and the arm profile can be kept narrower overall, so that the two mast arms 16, 16' with a small distance next to each other or can be stored.
  • a sealing bulkhead assembly 38 comprising two bulkheads or partition plates 40 is provided, as will be described in more detail below.
  • the double-legged legs 46 are freed in the region of the hinge point 18 on their belts 42, so that the web extensions of the other mast arm 16 can engage there.
  • the recessed areas are shielded inwardly towards the second hinge point 36 by the rectangular-flat bulkheads 40, which are provided at their peripheral sides or outer edges with a circumferential elastic seal 48.
  • Fig. 4 illustrates the sealing bulkhead assembly 38 in a section transverse to the longitudinal center axis of the formed by a metal plate, in outline rectangular bulkhead 40. This is provided on its peripheral side or at its four outer edges with a circumferential sealing groove 50 in which the seal 48 is arranged correspondingly circumferentially. The seal 48 is on the inside against the adjacent side walls (webs 44 and not visible in the section straps 42) elastically sealing, whereby the opening cross-section of the cavity 34 is closed.
  • the bulkhead 40 is pre-fixed without seal 48 in the cross-section to be sealed in the course of welding of the straps 42 and webs 44. This may be done by point welding, where the weld 52 should preferably be in the central region near the neutral fiber of the respective sidewall (e.g., land 44).
  • the seal 48 by a introduced into the seal groove 50 formless sealant made of a curable polyurethane sealant educated.
  • a bore 54 is provided as a sprue for the sealant in a side wall (shown here: web 44).
  • the polyurethane sealant forms a permanently elastic seal 48 which reliably closes the gap region between bulkhead 40 and side walls 42, 44.

Description

Die Erfindung betrifft einen Mast für eine Arbeitsmaschine, insbesondere einen Betonverteilermast zur Führung einer Betonförderleitung, mit mehreren in eine Arbeitsstellung bewegbaren Mastarmen, die zumindest abschnittsweise als Kastenkonstruktion aus mehreren einen Hohlraumbereich begrenzenden Seitenwänden zusammengesetzt sind, und einer Dichtschottanordnung zur Abdichtung eines Querschnitts des Hohlraumbereichs. Die Erfindung betrifft weiter ein Verfahren zur Herstellung eines solchen Masts.The invention relates to a mast for a working machine, in particular a concrete distributor mast for guiding a concrete conveying line, with a plurality of movable in a working position mast arms, which are at least partially assembled as a box construction of a plurality of cavity area limiting side walls, and a sealing bulkhead assembly for sealing a cross section of the cavity area. The invention further relates to a method for producing such a mast.

An Mastarmen von Betonverteilermasten wird im Gelenksbereich zum einen der jeweilige Schwenkantrieb angeschlossen, zum anderen müssen die Arme untereinander verbunden werden. Beides erfordert fallweise das Öffnen der Kastenprofilträger. Um zu verhindern, dass Wasser in den Hohlraumbereich des Arms eindringt, werden in der Praxis die Öffnungen mit eingeschweißten Dichtschotten wieder verschlossen. Bei dieser Bauweise müssen die zu dichtenden Bereiche soweit zugänglich sein, dass die notwendigen Schweißnähte eingebracht werden können. Zudem können solche Schweißnähte zu unerwünschter Kerbwirkung in den Bauteilen führen. Die EP 0 838 563 A1 offenbart einen Mast für eine Arbeitsmaschine mit den Merkmalen des einleitenden Teils des Anspruchs 1.On mast arms of concrete distributor masts the respective pivot drive is connected in the joint area on the one hand, on the other hand, the arms must be interconnected. Both require occasionally opening the box section carrier. In order to prevent water from penetrating into the cavity region of the arm, in practice the openings are closed again with welded-in sealing seals. In this construction, the areas to be sealed must be accessible so far that the necessary welds can be introduced. In addition, such welds can lead to undesirable notch effect in the components. The EP 0 838 563 A1 discloses a mast for a work machine with the features of the introductory part of claim 1.

Ausgehend hiervon liegt der Erfindung die Aufgabe zugrunde, die im Stand der Technik bekannten Mastarme und Mastherstellungsverfahren weiter zu verbessern und eine herstellungstechnisch einfache und zuverlässige Abdichtung auch in schwer zugänglichen Bereichen zu schaffen und somit eine Optimierung der Mastkonstruktion zu ermöglichen.Proceeding from this, the present invention seeks to further improve the known in the art mast arms and Mastherstellungsverfahren and to provide a manufacturing technology simple and reliable seal even in hard to reach areas and thus to enable optimization of the mast construction.

Zur Lösung dieser Aufgabe wird die in den unabhängigen Patentansprüchen angegebene Merkmalskombination vorgeschlagen. Vorteilhafte Ausgestaltungen und Weiterbildungen der Erfindung ergeben sich aus den abhängigen Ansprüchen.To solve this problem, the combination of features specified in the independent claims is proposed. Advantageous embodiments and modifications of the invention will become apparent from the dependent claims.

Die Erfindung geht von dem Gedanken aus, anstelle einer stoffschlüssigen Abdichtung durch Schweißnähte ein Dichtungsprofil einzusetzen. Dementsprechend wird erfindungsgemäß vorgeschlagen, dass die Dichtschottanordnung eine Schottwand aufweist, die an ihrer Umfangsseite mit einer zumindest abschnittsweise und bevorzugt vollständig umlaufenden Dichtungsnut versehen ist, und dass in der Dichtungsnut eine elastische Dichtung angeordnet ist, welche innenseitig gegen die angrenzenden Seitenwände dicht anliegt. Durch eine solche in einem rillenförmigen Sitz verlaufende Profildichtung können auch Bereiche abgedichtet werden, in denen aus Platzmangel und/oder wegen Kerbwirkung keine Schweißung ausgeführt werden kann. Damit kann das Armprofil filigraner gestaltet werden und muss nicht aus Gründen der Zugänglichkeit größer und damit schwerer als eigentlich notwendig gebaut werden. Außerdem können durch Vermeidung ungünstiger Kerbwirkung die Armkonstruktionen, bei denen bisher dickere Bleche oder Aufdoppelungen notwendig waren, leichter gebaut werden.The invention is based on the idea to use a sealing profile instead of a cohesive seal by welds. Accordingly, the invention proposes that the sealing bulkhead assembly has a bulkhead, which is provided on its peripheral side with an at least partially and preferably completely circumferential sealing groove, and that in the sealing groove, an elastic seal is arranged, which rests tightly against the adjacent side walls inside. By means of such a profiled seal running in a groove-like seat, it is also possible to seal off areas in which, owing to lack of space and / or due to notch effect, no welding can be carried out. Thus, the arm profile can be made filigree and does not have to be built for reasons of accessibility larger and thus heavier than actually necessary. In addition, by avoiding unfavorable notch effect, the arm structures, which previously required thicker sheets or doublings, could be made lighter.

Eine vorteilhafte Ausführung sieht vor, dass die Dichtung durch eine in die Dichtungsnut eingebrachte formlose Dichtungsmasse vorzugsweise aus einem Polyurethan-Dichtstoff gebildet ist. Auf diese Weise wird bei Schweißarbeiten in der Vorfertigung die Dichtung nicht beschädigt, und es wird eine genaue Konturanpassung unter Ausgleich von Toleranzen ermöglicht.An advantageous embodiment provides that the seal is preferably formed by a introduced into the seal groove informal sealant from a polyurethane sealant. In this way, welds in prefabrication do not damage the seal and allow accurate contour matching to compensate for tolerances.

Um eine solche Dichtung herstellungstechnisch einfach zu integrieren, ist es von Vorteil, einen in einer vorzugsweise durch einen Gurt gebildeten Seitenwand oder in der Schottwand verlaufenden Angusskanal zum Einbringen von Dichtungsmasse in die Dichtungsnut vorzusehen.To easily integrate such a seal manufacturing technology, it is advantageous to provide a runner in a preferably formed by a belt side wall or in the bulkhead running sprue for introducing sealant in the seal groove.

Vorteilhafterweise ist die in dem zu dichtenden Querschnitt positionierte Schottwand durch eine stoff-, form- oder reibschlüssige Verbindung an mindestens einer Seitenwand in einer gewünschten Position vorfixiert.Advantageously, the bulkhead positioned in the section to be sealed is prefixed by a material, positive or frictional connection to at least one side wall in a desired position.

Günstig ist es auch, wenn die Verbindungsstelle zwischen der Schottwand und einer Seitenwand des Kastenprofils (vorzugsweise einem Steg) zentral in der Seitenwand im Bereich der neutralen Faser angeordnet ist.It is also favorable if the connection point between the bulkhead and a side wall of the box section (preferably a web) is arranged centrally in the side wall in the region of the neutral fiber.

Vorteilhafterweise ist die Schottwand als an die abzudichtende Querschnittkontur angepasste, insbesondere viereckige Platte aus Metall gebildet. Denkbar ist auch der Einsatz von Kunststoffformteilen als Schottwand.Advantageously, the bulkhead is formed as adapted to the sealed cross-sectional contour, in particular square plate made of metal. Also conceivable is the use of plastic moldings as a bulkhead.

Um eine umlaufende Nut einfach zu realisieren, ist es möglich, dass die Schottwand mehrlagig aufgebaut ist, wobei die seitlichen Außenlagen die Nutflanken der Dichtungsnut bilden.In order to easily realize a circumferential groove, it is possible that the bulkhead is constructed in multiple layers, wherein the lateral outer layers form the groove flanks of the sealing groove.

Herstellungstechnisch ist es von Vorteil, wenn das Kastenprofil aus zwei einander gegenüberliegenden Stegen und zwei außenliegend auf den Längskanten der Stege aufliegenden Gurten gebildet ist. In einer solchen Konstruktion sind bisher eingeschweißte Schotte im Gelenkbereich vorgesehen, die durch die erfindungsgemäße Lösung kerbfrei ersetzt werden können.Manufacturing technology, it is advantageous if the box section is formed of two opposing webs and two outboard resting on the longitudinal edges of the webs straps. In such a construction previously welded bulkhead are provided in the joint area, which can be replaced by the inventive solution kerbfrei.

Ein besonders vorteilhafter Einsatz ergibt sich dadurch, dass die Dichtschottanordnung eine Gelenkstelle am Endabschnitt eines Mastarms gegen Zutritt von korrosiven Medien abdichtet.A particularly advantageous use results from the fact that the sealing bulkhead assembly seals a hinge point on the end portion of a mast arm against access of corrosive media.

Gegenstand der Erfindung ist auch ein Verfahren zur Herstellung eines Masts für eine Arbeitsmaschine, insbesondere eines Betonverteilermasts zur Führung einer Betonförderleitung, bei dem mehrere Mastarme vorzugsweise gelenkig miteinander verbunden werden, wobei die Mastarme zumindest abschnittsweise als Kastenprofil aus mehreren einen Hohlraumbereich begrenzenden Seitenwänden zusammengesetzt werden, und bei dem eine Dichtschottanordnung in einen Querschnitt des Hohlraumbereichs eingesetzt wird. In diesem Zusammenhang wird vorgeschlagen, dass eine Schottwand an ihrer Umfangsseite mit einer zumindest abschnittsweise umlaufenden Dichtungsnut versehen wird, und dass in der Dichtungsnut eine innenseitig gegen die angrenzenden Seitenwände dicht anliegende Dichtung angeordnet wird. In verfahrensmäßiger Hinsicht werden die oben beschriebenen Effekte Vorteile der analogen Vorrichtungsmerkmale in gleicher Weise erreicht.The invention also provides a method for producing a mast for a work machine, in particular a concrete distributor mast for guiding a concrete conveying line, in which a plurality of mast arms are preferably connected to one another in an articulated manner, wherein the mast arms are at least partially assembled as a box profile from a plurality of side walls defining a cavity area, and in which a sealing bulkhead assembly is inserted into a cross section of the cavity area. In this context, it is proposed that a bulkhead is provided on its peripheral side with an at least partially circumferential sealing groove, and that in the seal groove against an inside against the adjacent side walls are arranged tight-fitting seal. From a procedural point of view, the above-described effects of analog device features are achieved in the same way.

Ein bevorzugte Maßnahme sieht vor, dass die Schottwand in dem zu dichtenden Querschnitt durch Anschweißen oder -heften, Klemmen, Anschrauben, Anschläge oder Nuten vorfixiert wird. Sodann ist es vorteilhaft, wenn eine formlose Dichtungsmasse in die Dichtungsnut eingebracht und darin unter Bildung der Dichtung ausgehärtet wird. In diesem Zusammenhang ist es auch günstig, wenn die Dichtungsnut über einen von außerhalb des Mastarms zugänglichen Zuführkanal in einer Seitenwand oder in der Schottwand mit einer Dichtungsmasse verfüllt wird.A preferred measure provides that the bulkhead is prefixed in the cross section to be sealed by welding or stapling, clamping, screwing, stops or grooves. Then it is advantageous if a formless sealant is introduced into the seal groove and cured therein to form the seal. In this context, it is also advantageous if the sealing groove is filled with a sealing compound via a feed channel accessible from outside the mast arm in a side wall or in the bulkhead wall.

Im Folgenden wird die Erfindung anhand des in der Zeichnung schematisch dargestellten Ausführungsbeispiels näher erläutert. Es zeigen:

Fig. 1
eine Autobetonpumpe mit einem entfaltbaren mehrarmigen Betonverteilermast in Seitenansicht;
Fig. 2
zwei gelenkig verbundene Mastarme des Betonverteilermasts mit einer eingesetzten Dichtschottanordnung in perspektivischer Darstellung;
Fig. 3
den unteren Mastarm nach Fig. 2;
Fig. 4
einen Querschnitt der Dichtschottanordnung.
In the following the invention will be explained in more detail with reference to the embodiment shown schematically in the drawing. Show it:
Fig. 1
a truck-mounted concrete pump with a deployable multi-arm concrete distribution boom in side view;
Fig. 2
two articulated mast arms of the concrete distributor mast with an inserted seal bulkhead arrangement in perspective view;
Fig. 3
the lower mast arm after Fig. 2 ;
Fig. 4
a cross section of the seal bulkhead assembly.

Die in Fig. 1 gezeigte Autobetonpumpe 10 umfasst ein Straßenfahrzeug 12 und einen darauf transportierbaren Betonverteilermast 14 mit mehreren Mastarmen 16, die über Knickgelenke 18 miteinander verbunden sind und mittels hydraulischer Schwenkantriebe 20 an den Knickgelenken 18 gegeneinander verschwenkbar sind, so dass eine entlang dem Mast 14 geführte Betonförderleitung 22 mit ihrem Endschlauch in einem Arbeitsbereich variabel positionierbar ist.In the Fig. 1 shown truck concrete pump 10 includes a road vehicle 12 and a transportable thereon Betonverteilermast 14 with multiple mast arms 16 which are connected via articulated joints 18 and by means of hydraulic actuators 20 at the articulated joints 18 are mutually pivotable, so that guided along the mast 14 Concrete delivery line 22 with its end hose is variably positioned in a workspace.

Fig. 2 zeigt zwei Mastarme 16, 16' des Armpakets nach Fig. 1, die an ihren abgekröpften gabelförmigen Enden über ein Knickgelenk 18 gelenkig miteinander verbunden sind. Um eine Schwenkbewegung um das Knickgelenk 18 auszuführen, ist ein Hydraulikzylinder als Schwenkantrieb 20 vorgesehen, der bodenseitig über eine Gelenkstelle 24 an einem Mastarm 16 angelenkt ist und der stangenseitig über ein Umlenkgestänge 26 nahe dem Knickgelenk 18 an beiden Mastenden angreift. Zweckmäßig umfasst das Umlenkgestänge 26 ein Paar von außenseitig an dem Mastarmende des einen Mastarms 16 angreifenden Umlenkhebeln 28 und ein Paar von in den offenen Gabelbereich des anderen Mastarmendes eingreifenden Druckstangen 30. Diese sind an einem Gelenkbolzen 32 gelagert, der eine den Hohlraumbereich 34 an den Gabelenden des Mastarms 16' durchdringende Gelenkstelle 36 bildet. Fig. 2 shows two mast arms 16, 16 'of the arm package after Fig. 1 , which are hinged together at their bent forked ends via an articulation 18. In order to perform a pivoting movement about the articulated joint 18, a hydraulic cylinder is provided as a pivot drive 20, which is articulated on the bottom side via a hinge point 24 on a mast arm 16 and the rod side engages over a deflection linkage 26 near the articulated joint 18 at both ends of the mast. Conveniently, the turning linkage 26 comprises a pair of turning levers 28 engaging externally on the mast arm end of one mast arm 16 and a pair of push rods 30 engaging the open clevis portion of the other mast arm end. These are mounted on a hinge pin 32 which defines the cavity portion 34 at the fork ends of the mast arm 16 'penetrating hinge point 36 forms.

Durch die Verlagerung der Druckstangen 30 nach innen in den U-förmigen Freiraum kann die Betonförderleitung 22 relativ eng am Mastarm 16' vorbeigeführt werden und das Armprofil kann insgesamt schmaler gehalten werden, so dass die beiden Mastarme 16, 16' mit geringem Abstand nebeneinander geführt bzw. abgelegt werden können.By the displacement of the push rods 30 inwardly in the U-shaped space, the concrete conveyor line 22 can be relatively narrow past the mast arm 16 'and the arm profile can be kept narrower overall, so that the two mast arms 16, 16' with a small distance next to each other or can be stored.

Um das Eindringen von korrosiven Medien, insbesondere Wasser in den Hohlraumbereich 34 zu verhindern, ist eine Dichtschottanordnung 38 umfassend zwei Schottwände bzw. Schottbleche 40 vorgesehen, wie sie weiter unten näher beschrieben wird.In order to prevent the penetration of corrosive media, in particular water into the cavity region 34, a sealing bulkhead assembly 38 comprising two bulkheads or partition plates 40 is provided, as will be described in more detail below.

Wie auch aus Fig. 3 ersichtlich, bestehen die Mastarme 16 bzw. 16'als langgestreckte kastenförmige Stahlkonstruktion zumindest abschnittsweise aus zwei Gurten 42 und zwei die Gurte 42 seitlich verbindenden Stegen 44. Dabei liegen die Gurte 42 generell außen auf den Längskanten der Stege 44 auf, wobei Schweißnähte längs der von dem hohlen Innenraum abgewandten Außenränder der Stege 44 verlaufen und für eine durchgängige dichte Verbindung sorgen. Durch die Vermeidung von Gurtsprüngen in den Zwischenbereich zwischen den Stegen 44 hinein wird eine hohe Steifigkeit der Kastenkonstruktion erreicht und eine ungünstige Kerbwirkung durch querlaufende Schweißnähte vermieden.As well as out Fig. 3 it can be seen, consist of the mast arms 16 and 16'as an elongated box-shaped steel construction at least partially from two straps 42 and two straps 42 laterally connecting webs 44. The straps 42 are generally outside on the longitudinal edges of the webs 44th , wherein welds extend along the side facing away from the hollow interior outer edges of the webs 44 and provide a continuous tight connection. By avoiding belt jumps in the intermediate region between the webs 44 into a high rigidity of the box construction is achieved and avoided an unfavorable notch effect by transverse welds.

An dem gabelförmigen Ende des Mastarms 16' sind die doppelstegigen Schenkel 46 im Bereich der Gelenkstelle 18 an ihren Gurten 42 freigespart, so dass die Stegfortsätze des anderen Mastarms 16 dort eingreifen können. Die freigesparten Bereiche werden nach innen zu der zweiten Gelenkstelle 36 hin durch die rechteckförmig-flachen Schottwände 40 abgeschirmt, die an ihren Umfangsseiten bzw. Außenkanten mit einer umlaufenden elastischen Dichtung 48 versehen sind.At the fork-shaped end of the mast arm 16 ', the double-legged legs 46 are freed in the region of the hinge point 18 on their belts 42, so that the web extensions of the other mast arm 16 can engage there. The recessed areas are shielded inwardly towards the second hinge point 36 by the rectangular-flat bulkheads 40, which are provided at their peripheral sides or outer edges with a circumferential elastic seal 48.

Fig. 4 veranschaulicht die Dichtschottanordnung 38 in einem Schnitt quer zur Längsmittelachse der durch eine Metallplatte gebildeten, im Umriss rechteckförmigen Schottwand 40. Diese ist an ihrer Umfangsseite bzw. an ihren vier Außenkanten mit einer umlaufenden Dichtungsnut 50 versehen, in welcher die Dichtung 48 entsprechend umlaufend angeordnet ist. Dabei liegt die Dichtung 48 innenseitig gegen die angrenzenden Seitenwände (Stege 44 und in dem Schnitt nicht sichtbare Gurte 42) elastisch dichtend an, wodurch der Öffnungsquerschnitt des Hohlraums 34 verschlossen wird. Fig. 4 illustrates the sealing bulkhead assembly 38 in a section transverse to the longitudinal center axis of the formed by a metal plate, in outline rectangular bulkhead 40. This is provided on its peripheral side or at its four outer edges with a circumferential sealing groove 50 in which the seal 48 is arranged correspondingly circumferentially. The seal 48 is on the inside against the adjacent side walls (webs 44 and not visible in the section straps 42) elastically sealing, whereby the opening cross-section of the cavity 34 is closed.

Bei der Herstellung eines Mastarms 16 wird im Zuge der Verschweißung der Gurte 42 und Stege 44 die Schottwand 40 noch ohne Dichtung 48 in dem zu dichtenden Querschnitt vorfixiert. Dies kann durch punktförmiges Anschweißen erfolgen, wobei die Schweißstelle 52 bevorzugt im Zentralbereich nahe der neutralen Faser der betreffenden Seitenwand (z.B. Steg 44) liegen sollte.In the production of a mast arm 16, the bulkhead 40 is pre-fixed without seal 48 in the cross-section to be sealed in the course of welding of the straps 42 and webs 44. This may be done by point welding, where the weld 52 should preferably be in the central region near the neutral fiber of the respective sidewall (e.g., land 44).

Sodann wird die Dichtung 48 durch eine in die Dichtungsnut 50 eingebrachte formlose Dichtungsmasse aus einem aushärtbaren Polyurethan-Dichtstoff gebildet. Zu diesem Zweck ist in einer Seitenwand (hier gezeigt: Steg 44) eine Bohrung 54 als Angusskanal für die Dichtungsmasse vorgesehen. Nach dem Vernetzen bildet der Polyurethan-Dichtstoff eine dauerelastische Dichtung 48, die den Spaltbereich zwischen Schottwand 40 und Seitenwänden 42, 44 zuverlässig verschließt.Then, the seal 48 by a introduced into the seal groove 50 formless sealant made of a curable polyurethane sealant educated. For this purpose, a bore 54 is provided as a sprue for the sealant in a side wall (shown here: web 44). After crosslinking, the polyurethane sealant forms a permanently elastic seal 48 which reliably closes the gap region between bulkhead 40 and side walls 42, 44.

Zusammenfassend ist folgendes festzuhalten: Die Erfindung betrifft einen Mast für eine Arbeitsmaschine, insbesondere Betonverteilermast 14 zur Führung einer Betonförderleitung 22, mit mehreren in eine Arbeitsstellung bewegbaren Mastarmen 16, die zumindest abschnittsweise als Kastenkonstruktion aus mehreren einen Hohlraumbereich 34 begrenzenden Seitenwänden 42, 44 zusammengesetzt sind, und einer Dichtschottanordnung 38 zur Abdichtung eines Querschnitts des Hohlraumbereichs 34, wobei die Dichtschottanordnung 38 eine umfangsseitig mit einer zumindest abschnittsweise umlaufenden Dichtungsnut 50 versehene Schottwand 40 aufweist, und dass in der Dichtungsnut 50 eine innenseitig gegen die angrenzenden Seitenwände 42, 44 dicht anliegende elastische Dichtung 48 angeordnet ist.In summary, the following is to be stated: The invention relates to a mast for a work machine, in particular concrete distributor mast 14 for guiding a concrete conveyor line 22, with a plurality of movable in a working position mast arms 16, at least partially as a box construction of a plurality of cavity portion 34 bounding side walls 42, 44 are composed and a sealing bulkhead arrangement 38 for sealing a cross section of the cavity region 34, wherein the sealing bulkhead arrangement 38 has a bulkhead 40 provided on the circumference with a sealing groove 50 surrounding at least sections, and in the sealing groove 50 an elastic seal 48 tightly fitting against the adjacent side walls 42, 44 is arranged.

Claims (13)

  1. A boom for a working machine, in particular a concrete distributing boom (14) for guiding a concrete delivery line (22), comprising a plurality of boom arms (16), which are movable into a working position and which are composed at least partially, as a box construction, of a plurality of side walls (42, 44) delimiting a cavity region (34), and further comprising a sealing partition arrangement (38) for sealing a cross section of the cavity region (34), characterized in that the sealing partition arrangement (38) has a partition wall (40) peripherally provided with an at least partially circumferential sealing groove (50), and in that in the sealing groove (50) is arranged an elastic seal (48), which bears in a sealtight manner against the inside of the adjacent side walls (42, 44).
  2. The boom as claimed in claim 1, characterized in that the seal (48) is formed by a formless sealing compound, which has been introduced into the sealing groove (50) and preferably consists of a polyurethane sealant.
  3. The boom as claimed in claim 1 or 2, characterized by a feed channel (54) for the introduction of sealing compound into the sealing groove (50), which feed channel extends in a side wall (42), formed preferably by a chord, or in the partition wall (40).
  4. The boom as claimed in one of claims 1 to 3, characterized in that the partition wall (40) positioned in the cross section to be sealed is fixed to at least one side wall (42, 44) by an integrally bonded, positive or non-positive connection (52).
  5. The boom as claimed in one of claims 1 to 4, characterized in that a junction between the partition wall (40) and a side wall (42, 44) of the box section is arranged in a central region of the side wall (42, 44).
  6. The boom as claimed in one of claims 1 to 5, characterized in that the partition wall (40) is formed as an, in particular, quadrangular metal or plastics plate.
  7. The boom as claimed in one of claims 1 to 6, characterized in that the partition wall (40) is of multilayered construction, wherein the lateral outer layers form the groove flanks of the sealing groove (50).
  8. The boom as claimed in one of claims 1 to 7, characterized in that the box section is formed of two mutually opposing webs (44), and two chords (42) resting externally on the longitudinal edges of the webs.
  9. The boom as claimed in one of claims 1 to 8, characterized in that the sealing partition arrangement (38) seals a hinge joint (36) on the end portion of a boom arm (16) against ingress of corrosive media.
  10. A method for producing a boom for a working machine, in particular a concrete distributing boom (14) for guiding a concrete delivery line (22), in which a plurality of boom arms (16) are preferably articulately connected to one another, wherein the boom arms (16) are put together at least partially, as a box section, of a plurality of side walls (42, 44) delimiting a cavity region (34), and in which a sealing partition arrangement (38) is inserted into a cross section of the cavity region (34), characterized in that a partition wall (40) is provided on its peripheral side with an at least partially circumferential sealing groove (50), and in that in the sealing groove (50) is arranged a seal (48), which bears in a sealtight manner against the inside of the adjacent side walls (42, 44).
  11. The method as claimed in claim 10, characterized in that the partition wall (40) is pre-fixed in the cross section to be sealed, by welding or tacking, clamping, screwing, stops or grooves.
  12. The method as claimed in claim 10 or 11, characterized in that a formless sealing compound is introduced into the sealing groove (50) and is cured therein with the formation of the seal (48).
  13. The method as claimed in one of claims 10 to 12, characterized in that the sealing groove (50) is filled with a sealing compound via a feed channel (54) in a side wall (42, 44) or in the partition wall (40), which feed channel is accessible from outside the boom arm (16).
EP15800864.9A 2014-11-28 2015-11-26 Boom for a working machine and method for producing same Not-in-force EP3224430B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014224462.5A DE102014224462A1 (en) 2014-11-28 2014-11-28 Mast for a working machine and method for its production
PCT/EP2015/077764 WO2016083502A1 (en) 2014-11-28 2015-11-26 Boom for a working machine and method for producing same

Publications (2)

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EP3224430A1 EP3224430A1 (en) 2017-10-04
EP3224430B1 true EP3224430B1 (en) 2018-09-12

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EP15800864.9A Not-in-force EP3224430B1 (en) 2014-11-28 2015-11-26 Boom for a working machine and method for producing same

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US (1) US10100540B2 (en)
EP (1) EP3224430B1 (en)
KR (1) KR20170088878A (en)
DE (1) DE102014224462A1 (en)
WO (1) WO2016083502A1 (en)

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Also Published As

Publication number Publication date
WO2016083502A1 (en) 2016-06-02
US20170260761A1 (en) 2017-09-14
DE102014224462A1 (en) 2016-06-02
EP3224430A1 (en) 2017-10-04
KR20170088878A (en) 2017-08-02
US10100540B2 (en) 2018-10-16

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