EP3456887B1 - Excavator boom and excavator - Google Patents

Excavator boom and excavator Download PDF

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Publication number
EP3456887B1
EP3456887B1 EP18194014.9A EP18194014A EP3456887B1 EP 3456887 B1 EP3456887 B1 EP 3456887B1 EP 18194014 A EP18194014 A EP 18194014A EP 3456887 B1 EP3456887 B1 EP 3456887B1
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EP
European Patent Office
Prior art keywords
boom
plates
accordance
bearing plate
bearing
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EP18194014.9A
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German (de)
French (fr)
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EP3456887A1 (en
Inventor
Guillaume Elbel
Thomas Münch
Pascal FRITSCH
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Liebherr France SAS
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Liebherr France SAS
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Publication of EP3456887A1 publication Critical patent/EP3456887A1/en
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Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/08—Superstructures; Supports for superstructures
    • E02F9/10—Supports for movable superstructures mounted on travelling or walking gears or on other superstructures
    • E02F9/12—Slewing or traversing gears
    • E02F9/121—Turntables, i.e. structure rotatable about 360°
    • E02F9/125—Locking devices
    • 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
    • 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
    • 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
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/14—Booms only for booms with cable suspension arrangements; Cable suspensions
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/08—Superstructures; Supports for superstructures
    • E02F9/0808—Improving mounting or assembling, e.g. frame elements, disposition of all the components on the superstructures
    • E02F9/0825—Cast frame structure

Definitions

  • the invention relates to a boom for an earth moving machine, in particular an excavator, with at least two bearing plates for mounting a cylinder unit, these running at least largely parallel to one another in the longitudinal direction of the boom.
  • the object of the present invention consists in the search for possible solutions to problems in the design of the bearing points for cantilever structures of the generic type.
  • boom according to the features of claim 1.
  • Advantageous configurations of the boom are the subject of the dependent claims.
  • the term boom is used comprehensively. For example, it also includes a so-called style.
  • the bearing plate (s) be designed with a curvature extending outward at the end toward the side edge of the outer boom.
  • the invention applies both to boom designs with only one bearing plate and to such designs with two or more bearing plates.
  • the invention and its advantageous embodiments are always described below using an embodiment with two bearing plates, but the following explanations apply equally to a cantilever design with only one or more than two bearing plates.
  • At least one bearing plate or both bearing plates are guided at the end to the edge of the top side of the boom and adjoin the edge of the boom surface formed with the side faces. It is also provided here that the top side of the boom is widened in the area of the outwardly running bearing plates, ie the entire boom profile is made wider in the area of the at least one or the adjacent bearing plates so that the latter are extended beyond the original edge between the surface and the side part and on the extended boom area, ie the lateral extension of the boom are positioned. This design means that the ends of the bearing plates are less stressed.
  • the bearing plate (s) can be fastened standing vertically on the top side of the boom.
  • the boom can be composed of a rear and a front boom part in a materially bonded manner to form a boomerang-like boom structure, but the invention can in principle be used for any boom structure.
  • bearing plates extend outwards with an identical radius of curvature in each case. However, it is also conceivable to provide individual bearing plates with different radii of curvature.
  • the proposed bearing plate or plates are used to support a cylinder which is used to actuate an attachment and / or a boom extension mounted on the boom.
  • the corresponding attachment can additionally have a corresponding boom extension, a corresponding cylinder unit then being used to actuate the boom extension.
  • the curvature of the bearing plate or plates directly adjoins a pin receptacle of the bearing plate.
  • Corresponding bearing plates are usually formed by a bearing plate which, in the area of the widest point, provides a suitable bore for receiving a bearing pin.
  • the width of the bearing plates can usually be continuously reduced in the direction of the boom foot. In the direction of the boom tip, there is preferably a sudden reduction in the sheet metal width, with the bearing sheet metal reduced in width is then guided with a corresponding radius of curvature outwards to the edge of the boom surface.
  • the boom construction is composed of at least one front and at least one rear boom part.
  • the bearing plate (s) can extend, for example, at least for the most part on the top side of the boom top of the front boom part.
  • at least one upper connecting plate can be provided in the connecting area between the boom parts, which ideally represents a part of the boom top in the connecting area of the boom parts.
  • the connecting plate provides a suitable curvature depending on the angle of the two boom parts to one another.
  • the bearing plates extend from the boom top of the front boom part to the upper connecting plate.
  • the bearing plates which are usually welded to the boom parts, then extend at the end into a less stressed boom area on the connecting plate.
  • the weld seams required there are therefore subject to less stress, which has a positive effect on their resistance to fatigue. An otherwise necessary post-treatment of the weld seams could be dispensed with.
  • the present invention also relates to an earthmoving machine, in particular an excavator with at least one boom according to the present invention.
  • the advantages and properties of the earth moving machine therefore obviously correspond to the advantages and properties already discussed in connection with the excavator boom according to the invention, which is why a repetitive description is dispensed with at this point.
  • the perspective side view of the Figure 1 shows the overall structure of the excavator boom 10 according to the invention. This consists of a front boom part 11 and a rear boom part 12. Connection points 34 are provided on the front boom part for the movable mounting of an attachment or a boom extension, not shown here.
  • the rear boom section 12 comprises corresponding bearing points 16 at the end in order to be able to link it to an excavator superstructure or undercarriage such that it can be luffed.
  • Both the rear and the front boom part can be made as a monoblock. However, it is also possible to assemble the boom parts 11, 12 from individual elements.
  • Both boom parts 11, 12 have a box-shaped structure which is obtained by welding corresponding side plates.
  • the individual side plates 11a to 11d or 12a to 12d are welded to one another by fillet weld welding.
  • the connection between the two cantilever parts 11, 12 is created by the central connecting plate 13, at least the front edges of the side plates 11a, 11b and 12a, 12b and possibly the undersides 11d and 12d being firmly connected to one another via the connecting plate 13.
  • the connecting plate 13 has a curved shape, as a result of which a curved contact edge of the boom parts 11, 12 also extends along the side plates 11a, 11b, 12a, 12b results.
  • the connecting plate 13 is designed as a simple, thick plate. It allows a simple connection between the boom parts 11, 12 and, accordingly, a simple adaptation to the desired angle that the two boom elements 11, 12 form.
  • the boom surfaces 11c and 12c of the boom parts 11, 12 are not directly connected to one another. Instead, a plate-shaped upper connecting plate 15 is inserted or placed overlapping on the upper sides 11c, 12c, and welded to the two bracket parts 11, 12.
  • the plate-shaped upper connecting plate 15 is bent in accordance with the angle that the two arm parts 11, 12 form with respect to one another. If necessary, the underside of the boom could also be designed with a corresponding connecting element.
  • a cylindrical tube 21 extends transversely to the boom longitudinal axis through the boom box 12 and is welded onto the central connecting plate 13.
  • the application of the bearing tube 21 to the central connecting plate 13 at the same time ensures that the overall rigidity of the boom can also be increased.
  • a suitable bolt can be inserted into the cylinder tube 21 via outlet openings 21a, 21b within the side elements 12a, 12b.
  • additional reinforcement plates 22 are also attached to the outside of the side plates 12a, 12b.
  • the tube 21 forms the bearing point for connecting a luffing cylinder of the excavator according to the invention, which extends from the bearing point 21 of the rear boom part 12 to the upper carriage of the excavator.
  • the bearing point 30 consists of two parallel bearing plates 30a, 30b, which are perpendicular to the top side of the boom and run parallel in the longitudinal direction of the boom. In the area with the greatest width, a respective bore 31a, 31b is provided for receiving bolts, the edge of the bore being reinforced with additional metal sheets 32.
  • the width of the bearing plates 30a, 30b decreases steadily in the direction of the rear boom part 12.
  • the majority of the bearing plates including the bores 31a, 31b is arranged on the upper side 11a of the front boom part 11, but both plates 30a, 30b extend parallel to the upper connecting plate 15, to which the plate ends are welded.
  • the extension of the bearing plates 30a, 30b up to the connecting plate 15 has the advantage that the end of the weld seam that is formed lies in a region of the boom that is less stressed by force, which not only increases the fatigue resistance, but also enables manufacturing costs to be reduced If no additional treatment of the weld seam is necessary.
  • the width of the bearing plates 30a, 30b decreases abruptly after the bore 31a, 31b in the direction of the boom tip and then remains almost constant.
  • These bearing plate sections 33a, 33b with a reduced but almost constant width have a curvature so that the plate sections 33a, 33b do not protrude parallel to one another, but rather outwardly to the edges of the surface 11c of the front boom part 11.
  • the upper plate 11a of the front boom part 11 can be widened in the area of the bearing plate sections 33a, 33b adjoining the edge, so that the sheet metal elements 33a, 33b can protrude beyond the actual edge of the front boom part.
  • the bearing plates 30a, 30b By bending the bearing plates 30a, 30b, the overall rigidity of the bearing can be increased, but without the strength of the bearing plates 30a, 30b to have to increase.

Description

Die Erfindung betrifft einen Ausleger für eine Erdbewegungsmaschine, insbesondere einen Bagger, mit wenigstens zwei Lagerblechen zur Lagerung einer Zylindereinheit, diese zumindest großteils parallel zueinander in Auslegerlängsrichtung verlaufen.The invention relates to a boom for an earth moving machine, in particular an excavator, with at least two bearing plates for mounting a cylinder unit, these running at least largely parallel to one another in the longitudinal direction of the boom.

Unterschiedliche Auslegerstrukturen sind hinlänglich aus dem Stand der Technik bekannt, vgl. beispielsweise JP S63 76057 U , JP 2010 106463 A sowie WO 99/00554 A1 . Ebenfalls ist die Ausbildung von etwaigen Lagerstellen zur Anbindung von Linearaktoren bekannt, wobei diese strukturabhängig in Form von zwei parallelverlaufenden Lagerblechen gebildet werden. Da der Ausleger im Bereich der Aktuatoranbindung verhältnismäßig stark beansprucht wird, werden die Lagerbleche regelmäßig mit zusätzlichen Verstärkungsblechen versehen und/oder mit sehr großen Blechstärken erstellt. Diese Maßnahme ist aber teuer und führt zu einer nachteiligen Erhöhung des gesamten Auslegergewichtes.Different boom structures are sufficiently known from the prior art, see for example JP S63 76057 U , JP 2010 106463 A as WO 99/00554 A1 . The formation of any bearing points for the connection of linear actuators is also known, these being formed, depending on the structure, in the form of two parallel bearing plates. Since the boom is relatively heavily stressed in the area of the actuator connection, the bearing plates are regularly provided with additional reinforcement plates and / or made with very large plate thicknesses. However, this measure is expensive and leads to a disadvantageous increase in the total weight of the boom.

Die Aufgabe der vorliegenden Erfindung besteht in der Suche nach möglichen Problemlösungen bei der Ausgestaltung der Lagerstellen für gattungsgemäße Auslegerstrukturen.The object of the present invention consists in the search for possible solutions to problems in the design of the bearing points for cantilever structures of the generic type.

Gelöst wird diese Aufgabe durch einen Ausleger gemäß den Merkmalen des Anspruchs 1. Vorteilhafte Ausgestaltungen des Auslegers sind Gegenstand der abhängigen Ansprüche. Im Rahmen der Erfindung ist der Begriff Ausleger umfassend verwendet. Er umfaßt beispielsweise auch einen sogenannten Stil.This object is achieved by a boom according to the features of claim 1. Advantageous configurations of the boom are the subject of the dependent claims. In the context of the invention, the term boom is used comprehensively. For example, it also includes a so-called style.

Erfindungsgemäß wird für den gattungsgemäßen Ausleger vorgeschlagen, das oder die Lagerbleche mit einer endseitig nach außen zur Seitenkante des Außenlegers verlaufenden Krümmung auszuführen. Die Erfindung gilt sowohl für Auslegerausführungen mit nur einem Lagerblech als auch für solche Ausführungen mit zwei oder mehreren Lagerblechen. Der Einfachheit halber wird die Erfindung und deren vorteilhafte Ausführunge nachfolgend stets anhand einer Ausführung mit zwei Lagerblechen beschrieben, die nachfolgenden Erläuterungen gelten jedoch gleichermaßen für eine Auslegerausführung mit nur einem oder mehr als zwei Lagerblechen.According to the invention, it is proposed for the generic boom that the bearing plate (s) be designed with a curvature extending outward at the end toward the side edge of the outer boom. The invention applies both to boom designs with only one bearing plate and to such designs with two or more bearing plates. For the sake of simplicity, the invention and its advantageous embodiments are always described below using an embodiment with two bearing plates, but the following explanations apply equally to a cantilever design with only one or more than two bearing plates.

Bei eine Ausführung mit mehreren Lagerblechen verlaufen diese demzufolge nicht mehr parallel im Endabschnitt, sondern der Abstand zwischen den Lagerblechen vergrößert sich. Die spezielle Krümmung im Endbereich der Lagerbleche, insbesondere im der Auslegerspitze zugewandten Endbereich der Lagerbleche, wirkt sich vorteilhaft auf die resultierende mechanische Steifigkeit des Auslegers aus, insbesondere im Bereich der angeordneten Lagerbleche, da der Kraftabtrag von der Lagerstelle in den Ausleger besser verteilt werden kann. Hierdurch können idealerweise etwaige Verstärkungsbleche, wie sie im Stand der Technik üblich sind, entfallen. Zudem kann die Blechstärke der Lagerbleche reduziert werden. In Summe lässt die erfindungsgemäße Konstruktion eine deutliche Gewichtsreduktion zu. Der geringere Material- und Zeitaufwand bei der Herstellung des erfindungsgemäßen Auslegers sorgt für eine positive Kostenersparnis.In the case of an embodiment with several bearing plates, these consequently no longer run parallel in the end section, but rather the distance between the bearing plates increases. The special curvature in the end area of the bearing plates, in particular in the end area of the bearing plates facing the boom tip, has an advantageous effect on the resulting mechanical rigidity of the boom, especially in the area of the bearing plates arranged, since the force dissipation from the bearing point into the boom can be better distributed. In this way, any reinforcement plates, as are customary in the prior art, can ideally be dispensed with. In addition, the sheet thickness of the bearing sheets can be reduced. Overall, the construction according to the invention allows a significant weight reduction. The lower expenditure of material and time in the manufacture of the boom according to the invention ensures positive cost savings.

Erfindungsgemäß ist wenigstens ein Lagerblech oder sind beide Lagerbleche endseitig bis an den Rand der Auslegeroberseite geführt und grenzen an die gebildete Kante der Auslegeroberfläche mit den Seitenflächen an. Weiterhin ist hier vorgesehen, dass die Auslegeroberseite im Bereich der nach außen laufenden Lagerbleche verbreitert ist, d.h. das gesamte Auslegerprofil ist im Bereich des wenigstens einen bzw. der angrenzenden Lagerbleche breiter ausgeführt, sodass letztere über die ursprüngliche Kante zwischen Oberfläche und Seitenteil verlängert sind und auf dem erweiterten Auslegerbereich, d.h. der seitlichen Verbreiterung des Auslegers positioniert sind. Durch diese Konstruktion werden die Enden der Lagerbleche weniger beansprucht.According to the invention, at least one bearing plate or both bearing plates are guided at the end to the edge of the top side of the boom and adjoin the edge of the boom surface formed with the side faces. It is also provided here that the top side of the boom is widened in the area of the outwardly running bearing plates, ie the entire boom profile is made wider in the area of the at least one or the adjacent bearing plates so that the latter are extended beyond the original edge between the surface and the side part and on the extended boom area, ie the lateral extension of the boom are positioned. This design means that the ends of the bearing plates are less stressed.

Gemäß bevorzugter Ausführungsform kann das oder können die Lagerbleche senkrecht auf der Auslegeroberseite stehend befestigt sein.According to a preferred embodiment, the bearing plate (s) can be fastened standing vertically on the top side of the boom.

Der Ausleger kann aus einem hinteren und vorderen Auslegerteil stoffschlüssig zu einer boomerangähnlichen Auslegerstruktur zusammengesetzt sein, die Erfindung ist jedoch prinzipiell für jede Auslegerstruktur einsetzbar.The boom can be composed of a rear and a front boom part in a materially bonded manner to form a boomerang-like boom structure, but the invention can in principle be used for any boom structure.

Denkbar ist es, dass die Lagerbleche mit jeweils identischem Krümmungsradius nach außen verlaufen. Es ist jedoch ebenfalls vorstellbar, einzelne Lagerbleche mit unterschiedlichen Krümmungsradien zu versehen.It is conceivable that the bearing plates extend outwards with an identical radius of curvature in each case. However, it is also conceivable to provide individual bearing plates with different radii of curvature.

Das oder die vorgeschlagenen Lagerbleche dienen zur Lagerung eines Zylinders, der zur Betätigung eines am Ausleger montierten Anbaugerätes und/oder einer Auslegerverlängerung dient. Das entsprechende Anbaugerät kann ergänzend eine entsprechende Auslegerverlängerung aufweisen, wobei eine entsprechende Zylindereinheit dann zur Betätigung der Auslegerverlängerung dient.The proposed bearing plate or plates are used to support a cylinder which is used to actuate an attachment and / or a boom extension mounted on the boom. The corresponding attachment can additionally have a corresponding boom extension, a corresponding cylinder unit then being used to actuate the boom extension.

Ferner ist es bevorzugt, wenn sich die Krümmung des oder der Lagerbleche unmittelbar an eine Bolzenaufnahme der Lagerbleche anschließt. Entsprechende Lagerbleche werden üblicherweise durch ein Lagerblech gebildet, das im Bereich der breitesten Stelle, eine passende Bohrung zur Aufnahme eines Lagerbolzens vorsieht. In Richtung des Auslegerfußes kann die Breite der Lagerbleche üblicherweise stetig reduziert sein. In Richtung der Auslegerspitze erfolgt vorzugsweise eine sprungartige Reduktion der Blechbreite, wobei das in der Breite reduzierte Lagerblech dann mit entsprechendem Krümmungsradius nach außen zur Kante der Auslegeroberfläche geführt ist.Furthermore, it is preferred if the curvature of the bearing plate or plates directly adjoins a pin receptacle of the bearing plate. Corresponding bearing plates are usually formed by a bearing plate which, in the area of the widest point, provides a suitable bore for receiving a bearing pin. The width of the bearing plates can usually be continuously reduced in the direction of the boom foot. In the direction of the boom tip, there is preferably a sudden reduction in the sheet metal width, with the bearing sheet metal reduced in width is then guided with a corresponding radius of curvature outwards to the edge of the boom surface.

Die Auslegerkonstruktion ist aus wenigstens einem vorderen und wenigstens einem hinteren Auslegerteil zusammengesetzt. Das oder die Lagerbleche können sich bspw. zumindest Großteils auf der Auslegeroberseite des vorderen Auslegerteils erstrecken. Gemäß bevorzugter Ausgestaltung der Erfindung kann im Verbindungsbereich zwischen den Auslegerteilen wenigstens ein oberes Verbindungsblech vorgesehen sein, das idealerweise einen Teil der Auslegeroberseite im Verbindungsbereich der Auslegerteile darstellt. Das Verbindungsblech sieht eine passende Krümmung abhängig vom Winkel der beiden Auslegerteile zueinander vor. Im Falle einer solchen Sonderkonstruktion des Auslegers ist es besonders vorteilhaft, wenn sich die Lagerbleche von der Auslegeroberseite des vorderen Auslegerteils bis auf das obere Verbindungsblech erstrecken. Die üblicherweise mit den Auslegerteilen verschweißten Lagerbleche reichen dann endseitig in einen weniger beanspruchten Auslegerbereich auf das Verbindungsblech. Die dort notwendigen Schweißnähte unterliegen demzufolge einer geringeren Stressbeanspruchung, was sich positiv auf deren Ermüdungsresistenz auswirkt. Eine ansonsten notwendige Nachbehandlung der Schweißnähte könnte entfallen.The boom construction is composed of at least one front and at least one rear boom part. The bearing plate (s) can extend, for example, at least for the most part on the top side of the boom top of the front boom part. According to a preferred embodiment of the invention, at least one upper connecting plate can be provided in the connecting area between the boom parts, which ideally represents a part of the boom top in the connecting area of the boom parts. The connecting plate provides a suitable curvature depending on the angle of the two boom parts to one another. In the case of such a special construction of the boom, it is particularly advantageous if the bearing plates extend from the boom top of the front boom part to the upper connecting plate. The bearing plates, which are usually welded to the boom parts, then extend at the end into a less stressed boom area on the connecting plate. The weld seams required there are therefore subject to less stress, which has a positive effect on their resistance to fatigue. An otherwise necessary post-treatment of the weld seams could be dispensed with.

Neben dem erfindungsgemäßen Ausleger betrifft die vorliegende Erfindung zudem eine Erdbewegungsmaschine, insbesondere einen Bagger mit wenigstens einem Ausleger gemäß der vorliegenden Erfindung. Die Vorteile und Eigenschaften der Erdbewegungsmaschine entsprechen demnach offensichtlich den bereits im Zusammenhang mit dem erfindungsgemäßen Baggerausleger diskutierten Vorteilen und Eigenschaften, weshalb an dieser Stelle auf eine wiederholende Beschreibung verzichtet wird.In addition to the boom according to the invention, the present invention also relates to an earthmoving machine, in particular an excavator with at least one boom according to the present invention. The advantages and properties of the earth moving machine therefore obviously correspond to the advantages and properties already discussed in connection with the excavator boom according to the invention, which is why a repetitive description is dispensed with at this point.

Weitere Vorteile und Eigenschaften der Erfindung sollen im Folgenden anhand eines in den Figuren dargestellten Ausführungsbeispiels näher erläutert werden. Es zeigen:

Figur 1:
eine perspektivische Draufsicht auf den erfindungsgemäßen Baggerausleger;
Figur 2:
eine Detailansicht der Verbindungsstelle zwischen dem vorderen und hinteren Baggerauslegerteil und
Figur 3:
eine Detailansicht des Verbindungsbereichs der Figur 2 mit geöffneter Seitenfläche des Auslegerarms.
Further advantages and properties of the invention are to be explained in more detail below on the basis of an exemplary embodiment shown in the figures. Show it:
Figure 1:
a perspective top view of the excavator boom according to the invention;
Figure 2:
a detailed view of the junction between the front and rear excavator boom part and
Figure 3:
a detailed view of the connection area of the Figure 2 with the side surface of the extension arm open.

Die perspektivische Seitenansicht der Figur 1 zeigt den Gesamtaufbau des erfindungsgemäßen Baggerauslegers 10. Dieser besteht aus einem vorderen Auslegerteil 11 sowie einem hinteren Auslegerteil 12. Am vorderen Auslegerteil sind Verbindungsstellen 34 zur beweglichen Lagerung eines hier nicht dargestellten Anbaugerätes oder einer Auslegerverlängerung vorgesehen. Das hintere Auslegerstück 12 umfasst endseitig entsprechende Lagerstellen 16, um dieses an einem Baggerober- bzw. Unterwagen wippbar anlenken zu können.The perspective side view of the Figure 1 shows the overall structure of the excavator boom 10 according to the invention. This consists of a front boom part 11 and a rear boom part 12. Connection points 34 are provided on the front boom part for the movable mounting of an attachment or a boom extension, not shown here. The rear boom section 12 comprises corresponding bearing points 16 at the end in order to be able to link it to an excavator superstructure or undercarriage such that it can be luffed.

Sowohl das hintere als auch das vordere Auslegerteil kann als Monoblock gefertigt sein. Es ist jedoch ebenfalls möglich, die Auslegerteile 11, 12 aus Einzelelementen zusammenzusetzen.Both the rear and the front boom part can be made as a monoblock. However, it is also possible to assemble the boom parts 11, 12 from individual elements.

Beide Auslegerteile 11, 12 weisen eine kastenförmige Struktur auf, die durch das Verschweißen entsprechender Seitenbleche erhalten wird. Die einzelnen Seitenbleche 11a bis 11d bzw. 12a bis 12d werden per Kehlnaht-Schweißverfahren miteinander verschweißt.Both boom parts 11, 12 have a box-shaped structure which is obtained by welding corresponding side plates. The individual side plates 11a to 11d or 12a to 12d are welded to one another by fillet weld welding.

Die Verbindung zwischen beiden Auslegerteilen 11, 12 wird durch das zentrale Verbindungsblech 13 geschaffen, wobei zumindest die Stirnkanten der Seitenbleche 11a, 11b und 12a, 12b und gegebenenfalls der Unterseiten 11d und 12d über das Verbindungsblech 13 miteinander stoffschlüssig verbunden sind. Das Verbindungsblech 13 hat eine gekrümmte Form, wodurch sich ebenfalls eine gekrümmte Kontaktkante der Auslegerteile 11, 12 entlang der Seitenbleche 11a, 11b, 12a, 12b ergibt. Das Verbindungsblech 13 ist als einfaches, dickes Blech ausgestaltet. Es erlaubt eine einfache Verbindung zwischen den Auslegerteilen 11, 12 und dementsprechend eine einfache Anpassung an den gewünschten Winkel, den die beiden Auslegerelemente 11, 12 bilden. Zudem kann auch flexibel auf die gewünschte Breite der kastenförmigen Auslegerteile 11, 12, d.h. die Breite der jeweiligen Seitenflächen 11c, 12c reagiert werden. Die Konstruktion führt zu einer deutlichen Reduktion der anfallenden Herstellungskosten und des resultierenden Gesamtgewichtes des Auslegers 10.The connection between the two cantilever parts 11, 12 is created by the central connecting plate 13, at least the front edges of the side plates 11a, 11b and 12a, 12b and possibly the undersides 11d and 12d being firmly connected to one another via the connecting plate 13. The connecting plate 13 has a curved shape, as a result of which a curved contact edge of the boom parts 11, 12 also extends along the side plates 11a, 11b, 12a, 12b results. The connecting plate 13 is designed as a simple, thick plate. It allows a simple connection between the boom parts 11, 12 and, accordingly, a simple adaptation to the desired angle that the two boom elements 11, 12 form. In addition, it is also possible to react flexibly to the desired width of the box-shaped bracket parts 11, 12, ie the width of the respective side surfaces 11c, 12c. The construction leads to a significant reduction in the production costs incurred and the resulting total weight of the boom 10.

Im Bereich der Auslegeroberseite stehen die Auslegeroberflächen 11c bzw. 12c der Auslegerteile 11, 12 nicht unmittelbar miteinander in Verbindung. Stattdessen ist hier ein plattenförmiges oberes Verbindungsblech 15 eingesetzt bzw. überlappend auf die Oberseiten 11c, 12c aufgesetzt, und mit beiden Auslegerteilen 11, 12 verschweisst. Das plattenförmige obere Verbindungsblech 15 ist entsprechend dem Winkel, den beide Auslegerteile 11, 12 zueinander bilden, gebogen. Gegebenenfalls könnte auch die Auslegerunterseite mit einem entsprechenden Verbindungselement ausgestaltet sein.In the area of the top of the boom, the boom surfaces 11c and 12c of the boom parts 11, 12 are not directly connected to one another. Instead, a plate-shaped upper connecting plate 15 is inserted or placed overlapping on the upper sides 11c, 12c, and welded to the two bracket parts 11, 12. The plate-shaped upper connecting plate 15 is bent in accordance with the angle that the two arm parts 11, 12 form with respect to one another. If necessary, the underside of the boom could also be designed with a corresponding connecting element.

Im Bereich des hinteren Auslegerteils 12 erstreckt sich quer zur Auslegerlängsachse ein zylindrisches Rohr 21 durch den Auslegerkasten 12, das auf das zentrale Verbindungsblech 13 aufgeschweisst ist. Die Aufbringung des Lagerrohres 21 auf das zentrale Verbindungsblech 13 sorgt gleichzeitig dafür, dass die gesamte Steifigkeit des Auslegers zusätzlich erhöht werden kann. Über Austrittsöffnungen 21a, 21b innerhalb der Seitenelemente 12a, 12b kann ein passender Bolzen in das Zylinderrohr 21 gesteckt werden. Im Bereich der Austrittsöffnungen 21a, 21b sind zudem auf der Aussenseite der Seitenbleche 12a, 12b zusätzliche Verstärkungsbleche 22 angebracht. Das Rohr 21 bildet die Lagerstelle zur Anbindung eines Wippzylinders des erfindungsgemäßen Baggers, der sich von der Lagerstelle 21 des hinteren Auslegerteils 12 zum Oberwagen des Baggers erstreckt.In the area of the rear boom part 12, a cylindrical tube 21 extends transversely to the boom longitudinal axis through the boom box 12 and is welded onto the central connecting plate 13. The application of the bearing tube 21 to the central connecting plate 13 at the same time ensures that the overall rigidity of the boom can also be increased. A suitable bolt can be inserted into the cylinder tube 21 via outlet openings 21a, 21b within the side elements 12a, 12b. In the area of the outlet openings 21a, 21b, additional reinforcement plates 22 are also attached to the outside of the side plates 12a, 12b. The tube 21 forms the bearing point for connecting a luffing cylinder of the excavator according to the invention, which extends from the bearing point 21 of the rear boom part 12 to the upper carriage of the excavator.

Für die Lagerung eines weiteren hydraulischen Verstellmittels in Form eines Hydraulikzylinders ist auf der Oberseite des Auslegers 10 eine zusätzliche Lagerstelle 30 vorgesehen, die eine Aufnahme eines Zylinders ermöglicht, der sich von der Lagerstelle 30 bis hin zu einem am Lagerpunkt aufgenommenen Anbaugerät erstreckt.For the storage of a further hydraulic adjusting means in the form of a hydraulic cylinder, there is an additional bearing point on the upper side of the boom 10 30 is provided, which enables a cylinder to be received, which extends from the bearing point 30 to an attachment that is received at the bearing point.

Die Lagerstelle 30 besteht aus zwei parallel verlaufenden Lagerblechen 30a, 30b, die senkrecht auf der Auslegeroberseite stehen und parallel in Auslegerlängsrichtung verlaufen. Im Bereich mit der größten Breite ist jeweils eine Bohrung 31a, 31b zur Bolzenaufnahmen vorgesehen, wobei der Bohrungsrand mit zusätzlichen Blechen 32 verstärkt ist. Die Breite der Lagerbleche 30a, 30b nimmt in Richtung des hinteren Auslegerteils 12 stetig ab. Der Großteil der Lagerbleche inklusive der Bohrungen 31a, 31b ist auf der Oberseite 11a des vorderen Auslegerteils 11 angeordnet, allerdings erstrecken sich beide Bleche 30a, 30b parallel bis auf das obere Verbindungsblech 15, mit dem die Blechenden verschweißt sind. Die Verlängerung der Lagerbleche 30a, 30b bis hin zum Verbindungsblech 15 hat den Vorteil, dass das Ende der gebildeten Schweißnaht in einem weniger kraftbeanspruchten Bereich des Auslegers liegt, wodurch nicht nur die Materialermüdungsbeständigkeit erhöht werden kann, sondern zudem Herstellungskosten gesenkt werden können, da in diesem Fall keine zusätzliche Nachbehandlung der Schweißnaht notwendig ist.The bearing point 30 consists of two parallel bearing plates 30a, 30b, which are perpendicular to the top side of the boom and run parallel in the longitudinal direction of the boom. In the area with the greatest width, a respective bore 31a, 31b is provided for receiving bolts, the edge of the bore being reinforced with additional metal sheets 32. The width of the bearing plates 30a, 30b decreases steadily in the direction of the rear boom part 12. The majority of the bearing plates including the bores 31a, 31b is arranged on the upper side 11a of the front boom part 11, but both plates 30a, 30b extend parallel to the upper connecting plate 15, to which the plate ends are welded. The extension of the bearing plates 30a, 30b up to the connecting plate 15 has the advantage that the end of the weld seam that is formed lies in a region of the boom that is less stressed by force, which not only increases the fatigue resistance, but also enables manufacturing costs to be reduced If no additional treatment of the weld seam is necessary.

Ferner ist erkennbar, dass die Breite der Lagerbleche 30a, 30b nach der Bohrung 31a, 31b in Richtung der Auslegerspitze sprunghaft abnimmt und dann nahezu konstant bleibt. Diese Lagerblechabschnitt 33a, 33b mit verringerter aber nahezu konstanter Breite weisen eine Krümmung auf, so dass die Blechabschnitte 33a, 33b nicht parallel zueinander, sondern nach außen an die Kanten der Oberfläche 11c des vorderen Auslegerteils 11 ragen.It can also be seen that the width of the bearing plates 30a, 30b decreases abruptly after the bore 31a, 31b in the direction of the boom tip and then remains almost constant. These bearing plate sections 33a, 33b with a reduced but almost constant width have a curvature so that the plate sections 33a, 33b do not protrude parallel to one another, but rather outwardly to the edges of the surface 11c of the front boom part 11.

Das obere Blech 11a des vorderen Auslegerteils 11 kann im Bereich der an die Kante angrenzenden Lagerblechabschnitte 33a, 33b verbreitert sein, sodass die Blechelemente 33a, 33b über die eigentliche Kante des vorderen Auslegerteils hinausragen können. Durch die Biegung der Lagerbleche 30a, 30b kann die gesamte Steifigkeit der Lagerung erhöht werden, ohne jedoch die Stärke der Lagerbleche 30a, 30b erhöhen zu müssen. Darüber hinaus ist es auch nicht notwendig, weitere Verstärkungsbleche im Bereich der Lagerstelle anzubringen. Hierdurch lässt sich das Gesamtgewicht des Auslegers weiter reduzieren und dessen Herstellung weiter vereinfachen.The upper plate 11a of the front boom part 11 can be widened in the area of the bearing plate sections 33a, 33b adjoining the edge, so that the sheet metal elements 33a, 33b can protrude beyond the actual edge of the front boom part. By bending the bearing plates 30a, 30b, the overall rigidity of the bearing can be increased, but without the strength of the bearing plates 30a, 30b to have to increase. In addition, it is also not necessary to attach additional reinforcement plates in the area of the bearing point. This allows the total weight of the boom to be further reduced and its manufacture to be further simplified.

Claims (12)

  1. A boom (10) for an earth-moving machine, in particular an excavator, comprising one or more bearing plates for supporting a cylinder unit, characterized in that
    at least one bearing plate (30a, 39) has an end-side curvature (33a, 33b) extending outwardly to a lateral edge of the boom; in that a boom upper side is broadened in a region of the outwardly running bearing plate or plates; and in that the bearing plate or plates extend up to the broadened boom upper side.
  2. A boom in accordance with claim 1, characterized in that, in the case of at least two bearing plates, they extend at least to a greater extent in parallel with each other in a longitudinal direction of the boom.
  3. A boom in accordance with claim 1 or claim 2 , characterized in that at least one bearing plate is fastened standing perpendicular to the boom upper side, with the boom preferably being assembled with material continuity from a rear boom part (12) and a front boom part (11) to form a boomerang-like boom structure.
  4. A boom in accordance with one of the claims 1 to 3, characterized in that a plurality of bearing plates each extend outwardly with an identical radius of curvature.
  5. A boom in accordance with one of the preceding claims, characterized in that the bearing plate or plates are provided for supporting a cylinder for actuation of an attachment and/or of a boom extension.
  6. A boom in accordance with one of the preceding claims, characterized in that the end region of the bearing plate or plates extending to a boom tip has the curvature.
  7. A boom in accordance with one of the preceding claims, characterized in that the plate region of the bearing plate or plates directly adjoining a bolt receptacle (31a, 31b) extends outwardly.
  8. A boom in accordance with one of the preceding claims, characterized in that the bearing plate or plates extend at least to a greater extent on the boom upper side of the front boom part.
  9. A boom in accordance with one of the preceding claims, characterized in that the front and rear boom parts are at least regionally directly connected to each other and in addition a connection between the front and rear boom parts is provided by means of at least one upper connecting plate (15), with the bearing plate or plates extending from the boom upper side of the front boom part up to the connecting plate, and with the bearing plate or plate ideally ending at the upper connecting plate.
  10. A boom in accordance with claim 9, characterized in that the width of the bearing plate or plates reduces from the bolt receptacle in the direction of the rear boom part, in particular decreases constantly in this direction.
  11. A boom in accordance with one of the preceding claims, characterized in that the width of the bearing plate or plates decreases abruptly after the bolt receptacle in the direction of the boom tip.
  12. An earth-moving machine, in particular an excavator, having at least one boom in accordance with one of the preceding claims.
EP18194014.9A 2017-09-15 2018-09-12 Excavator boom and excavator Active EP3456887B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102017121516.6A DE102017121516A1 (en) 2017-09-15 2017-09-15 Excavator boom and excavator

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EP3456887A1 EP3456887A1 (en) 2019-03-20
EP3456887B1 true EP3456887B1 (en) 2021-06-09

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EP18194014.9A Active EP3456887B1 (en) 2017-09-15 2018-09-12 Excavator boom and excavator

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US (1) US10378182B2 (en)
EP (1) EP3456887B1 (en)
CN (1) CN109505319B (en)
DE (1) DE102017121516A1 (en)
ES (1) ES2887347T3 (en)

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DE102017110412B4 (en) * 2017-05-12 2020-06-10 Liebherr-Werk Ehingen Gmbh Telescopic boom and mobile crane
DE102017121518A1 (en) * 2017-09-15 2019-03-21 Liebherr-France Sas Excavator boom and excavator
DE102019116394A1 (en) 2019-06-17 2020-12-17 Liebherr-France Sas Excavator stick

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JPS6376057U (en) * 1986-11-07 1988-05-20
JPH06220884A (en) * 1993-01-21 1994-08-09 Yanmar Diesel Engine Co Ltd Boom structure for backhoe
CN1078286C (en) * 1996-01-31 2002-01-23 日立建机株式会社 Excavator
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JP2002364017A (en) * 2001-06-05 2002-12-18 Shin Caterpillar Mitsubishi Ltd Boom construction in construction machinery
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JP5101458B2 (en) * 2008-10-28 2012-12-19 住友重機械工業株式会社 Construction machine attachment
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Publication number Publication date
US10378182B2 (en) 2019-08-13
ES2887347T3 (en) 2021-12-22
DE102017121516A1 (en) 2019-03-21
EP3456887A1 (en) 2019-03-20
US20190085533A1 (en) 2019-03-21
CN109505319A (en) 2019-03-22
CN109505319B (en) 2022-07-12

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