EP1632450B1 - Clamshell bucket - Google Patents

Clamshell bucket Download PDF

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Publication number
EP1632450B1
EP1632450B1 EP05018585.9A EP05018585A EP1632450B1 EP 1632450 B1 EP1632450 B1 EP 1632450B1 EP 05018585 A EP05018585 A EP 05018585A EP 1632450 B1 EP1632450 B1 EP 1632450B1
Authority
EP
European Patent Office
Prior art keywords
rollers
clamshell
cutting edges
cutting
clamshell grab
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.)
Active
Application number
EP05018585.9A
Other languages
German (de)
French (fr)
Other versions
EP1632450A2 (en
EP1632450A3 (en
Inventor
Bernd Wager
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Liebherr Hydraulikbagger GmbH
Original Assignee
Liebherr Hydraulikbagger GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Liebherr Hydraulikbagger GmbH filed Critical Liebherr Hydraulikbagger GmbH
Publication of EP1632450A2 publication Critical patent/EP1632450A2/en
Publication of EP1632450A3 publication Critical patent/EP1632450A3/en
Application granted granted Critical
Publication of EP1632450B1 publication Critical patent/EP1632450B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C3/00—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith and intended primarily for transmitting lifting forces to loose materials; Grabs
    • B66C3/04—Tine grabs
    • 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
    • E02F3/40—Dippers; Buckets ; Grab devices, e.g. manufacturing processes for buckets, form, geometry or material of buckets
    • E02F3/402—Dippers; Buckets ; Grab devices, e.g. manufacturing processes for buckets, form, geometry or material of buckets with means for facilitating the loading thereof, e.g. conveyors
    • E02F3/404—Dippers; Buckets ; Grab devices, e.g. manufacturing processes for buckets, form, geometry or material of buckets with means for facilitating the loading thereof, e.g. conveyors comprising two parts movable relative to each other, e.g. for gripping
    • 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
    • E02F3/40—Dippers; Buckets ; Grab devices, e.g. manufacturing processes for buckets, form, geometry or material of buckets
    • E02F3/413—Dippers; Buckets ; Grab devices, e.g. manufacturing processes for buckets, form, geometry or material of buckets with grabbing device

Definitions

  • the invention relates to a grave or gripping tool with at least one cutting edge.
  • Grave or gripping tools are often used in excavators, such as clamshell grabs. They are also used in other areas, for example as wooden tongs for timber transporters.
  • the cutting of grave and gripping tools are exposed to continuous wear and tear when working on a secure surface, such as asphalt or concrete. After a certain period of operation, a sharpening of the cutting takes place.
  • the cutting edges are made of a highly wear-resistant material. They are welded in the outer edge area of the grave or gripping tool. If the blades are worn during use, they will be removed and replaced with new ones.
  • US-A-3301587 shows a fork lifter, at the fork arms in each case a roller is arranged in front.
  • US-A-3393014 shows an excavator bucket with tombs, to which a cutting wheel is arranged with a perpendicular to the cutting edge of the tomb teeth cutting edge.
  • Object of the present invention is to provide a digging or gripping tool in which the unwanted sharpening of the blades during use is largely prevented.
  • rollers are arranged along the outer edge of the cutting edges of a digging or gripping tool. These roles lead when closing the grave or gripping tool that the otherwise abrasive wear of the blade is prevented by the rolling movement of the rolling elements on the ground.
  • the invention makes use of the knowledge that a rolling wear is significantly lower than an abrasive. Overall, the rollers have a larger wear volume. So here is a wear system created that has significantly longer regeneration intervals. The regeneration, ie the preparation of the cutting edge after appropriate wear much easier, since not the entire blade burned down and must be replaced by welding a new cutting edge, but because here only the roles need to be replaced.
  • the substrate is spared when working with the grave or gripping tool.
  • webs can be provided perpendicular to the outer edge of the cutting edge, between which the rollers are mounted.
  • the webs or bearing surface between the rollers are preferably designed such that the supernatant of the bearing surface is carried out to the rollers out so that, for example, when using a wood tongs a single stem can still be safely absorbed.
  • FIG. 1 shows a clamshell grab 10 according to the prior art, wherein the shells 12 and 14 in opposite directions by means of a piston-cylinder device 16 about a support piece 18 are pivotable.
  • the clamshell grab is a so-called wooden pliers in which, for example, stacked logs can be gripped.
  • the clamshell gripper has in the outer edge region in each case cutting edges 20 and 22, which consist of a hardened material, such as a hardened steel. The cutting edges are welded at the corresponding point of the shells 12 zw. 14. After appropriate wear, they must be burned down and replaced with new welding edges.
  • FIG. 2 shows an embodiment of a grave or gripping tool according to the invention, which is also designated here by 10. It essentially points the same structure of clamshell claws according to FIG. 1 on. However, here are the cutting edges 20 and 22 modified. They have namely in the front cutting area, as in particular from the FIGS. 2a and 2b results in juxtaposed in series roller elements 24 which are rotatably mounted between perpendicularly away from the cutting edge 20, 22 webs 26, on. According to the view in FIG. 2a roll the rollers 24 of the cutting edge 20 on the ground, while the rollers of the cutting edge 24 during the closing of the clamshell 10 above the rollers 24 of the blade 20 are.
  • rollers 24 are rotatably mounted on shafts 28 which are fixed by the webs. By removing the shafts 28, the rollers can be easily removed and replaced by new rollers 24.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Earth Drilling (AREA)
  • Debarking, Splitting, And Disintegration Of Timber (AREA)
  • Harvester Elements (AREA)
  • Component Parts Of Construction Machinery (AREA)

Description

Die Erfindung betrifft ein Grab- oder Greifwerkzeug mit mindestens einer Schneide.The invention relates to a grave or gripping tool with at least one cutting edge.

Grab- oder Greifwerkzeuge werden häufig bei Baggern, beispielsweise als Zweischalengreifer verwendet. Auch in anderen Bereichen kommen sie zum Einsatz, beispielsweise als Holzzangen bei Holztransportern. Die Schneiden von Grab- und Greifwerkzeugen sind beim Arbeiten auf befestigen Untergrund, beispielsweise Asphalt oder Beton, einer stetigen Abnutzung und einem Verschleiß ausgesetzt. Nach einer bestimmten Betriebszeit findet dadurch ein Schärfen der Schneiden statt. Nach dem derzeitigen Stand der Technik bestehen die Schneiden aus einem hoch- und verschleißfesten Material. Sie werden im Außenkantenbereich des Grab- oder Greifwerkzeuges eingeschweißt. Werden die Schneiden während des Gebrauchs verschlissen, so werden diese abgebaut und durch neue ersetzt.Grave or gripping tools are often used in excavators, such as clamshell grabs. They are also used in other areas, for example as wooden tongs for timber transporters. The cutting of grave and gripping tools are exposed to continuous wear and tear when working on a secure surface, such as asphalt or concrete. After a certain period of operation, a sharpening of the cutting takes place. According to the current state of the art, the cutting edges are made of a highly wear-resistant material. They are welded in the outer edge area of the grave or gripping tool. If the blades are worn during use, they will be removed and replaced with new ones.

Bei bestimmten Einsätzen wie dem Verladen von Stammholz mit Holzzangen führen die durch Abnutzung angeschärften Schneiden zu großen Problemen. Beim Eindringen der geöffneten Holzzange in die aufeinandergelagerten Holzstämme kann es vorkommen, daß die Stämme gespalten und damit beschädigt werden, ohne daß der Fahrer dieses bemerkt. Das beschädigte Holz durchläuft unbemerkt den Produktionsprozess im Sägewerk. Oft werden diese Beschädigungen des Schnittholzes erst vom Endkunden bemerkt.In certain operations, such as logging logs with wooden tongs, the sharpened edges cause great problems. When the open wooden tongs penetrate into the stacked logs, it may happen that the logs are split and thus damaged, without the driver noticing this. The damaged wood goes unnoticed through the production process in the sawmill. Often these damages of the sawn timber are only noticed by the end customer.

Aus SU-A-592738 ist eine Holzzange bekannt, mit Greifarmen, entlang deren Innenumfang Rollen angeordnet sind.Out SU-A-592738 a wooden tongs is known, with gripping arms, along the inner circumference rollers are arranged.

US-A-3301587 zeigt einen Gabelheber, an dessen Gabelarmen vorne jeweils eine Rolle angeordnet ist. US-A-3301587 shows a fork lifter, at the fork arms in each case a roller is arranged in front.

US-A-3393014 zeigt eine Baggerschaufel mit Grabzähnen, an welchen ein Schneidrad mit einer senkrecht zur Schneidkante der Grabzähne verlaufenden Schneidkante angeordnet ist. US-A-3393014 shows an excavator bucket with tombs, to which a cutting wheel is arranged with a perpendicular to the cutting edge of the tomb teeth cutting edge.

Aufgabe der vorliegenden Erfindung ist es, ein Grab- oder Greifwerkzeug zu schaffen, bei dem das ungewollte Anschärfen der Schneiden während des Gebrauchs weitestgehend verhindert wird.Object of the present invention is to provide a digging or gripping tool in which the unwanted sharpening of the blades during use is largely prevented.

Diese Aufgabe wird erfindungsgemäß durch die Kombination der Merkmale des Anspruchs 1 gelöst. Demnach werden entlang der Außenkante der Schneiden eines Grab- oder Greifwerkzeugs Rollen angeordnet. Diese Rollen führen beim Schließen des Grab- oder Greifwerkzeugs dazu, daß der sonst abrasive Verschleiß der Schneide durch die Abrollbewegung der Rollelemente auf den Boden verhindert wird. Die Erfindung macht sich die Erkenntnis zunutze, daß ein rollender Verschleiß deutlich geringer ist als ein abrasiver. Die Rollen haben insgesamt ein größeres Verschleißvolumen. Es wird hier also ein Verschleißsystem geschaffen, das deutlich längere Regenerationsintervalle aufweist. Dabei wird die Regeneration, d. h. das Aufbereiten der Schneide nach entsprechender Abnutzung wesentlich vereinfacht, da hier nicht die gesamte Schneide abgebrannt und durch Einschweißen einer neuen Schneide ersetzt werden muß, sondern weil hier lediglich die Rollen ausgetauscht werden müssen. Außerdem wird der Untergrund beim Arbeiten mit dem Grab- oder Greifwerkzeug geschont. Beim Einsatz der erfindungsgemäßen Lösung für einen Holzgreifer wird vorteilhaft weniger Holz beschädigt, so daß die Qualitätssicherheit im Produktionsprozess in einem Sägewerk verbessert werden kann. Auch in anderen Bereichen des Einsatzes ist ein schonenderes Greifen möglich.This object is achieved by the combination of the features of claim 1. Accordingly, rollers are arranged along the outer edge of the cutting edges of a digging or gripping tool. These roles lead when closing the grave or gripping tool that the otherwise abrasive wear of the blade is prevented by the rolling movement of the rolling elements on the ground. The invention makes use of the knowledge that a rolling wear is significantly lower than an abrasive. Overall, the rollers have a larger wear volume. So here is a wear system created that has significantly longer regeneration intervals. The regeneration, ie the preparation of the cutting edge after appropriate wear much easier, since not the entire blade burned down and must be replaced by welding a new cutting edge, but because here only the roles need to be replaced. In addition, the substrate is spared when working with the grave or gripping tool. When using the solution according to the invention for a log grapple advantageously less wood is damaged, so that the Quality assurance in the production process in a sawmill can be improved. In other areas of the application, a gentler gripping is possible.

Bevorzugte Ausgestaltungen der Erfindung ergeben sich aus den sich an den Hauptanspruch anschließenden Unteransprüchen.Preferred embodiments of the invention will become apparent from the subsequent claims to the main claim.

Demnach können an der Außenkante der Schneide senkrecht Stege vorgesehen sein, zwischen denen die Rollen gelagert sind.Accordingly, webs can be provided perpendicular to the outer edge of the cutting edge, between which the rollers are mounted.

Die Stege oder Lagerfläche zwischen den Rollen sind vorzugsweise derart gestaltet, daß der Überstand der Lagerfläche zu den Rollen hin so ausgeführt wird, daß beispielsweise bei Verwendung einer Holzzange ein Einzelstamm trotzdem sicher aufgenommen werden kann.The webs or bearing surface between the rollers are preferably designed such that the supernatant of the bearing surface is carried out to the rollers out so that, for example, when using a wood tongs a single stem can still be safely absorbed.

Weitere Merkmale, Einzelheiten und Vorteile der Erfindung werden anhand eines in der Zeichnung dargestellten Ausführungsbeispiels näher erläutert.Further features, details and advantages of the invention will be explained in more detail with reference to an embodiment shown in the drawing.

Es zeigen:

Figur 1:
einen Zweischalengreifer mit konventionellen Schneiden nach dem Stand der Technik,
Figur 2:
ein Zweischalengreifer nach einer Ausführungsvariante der vorliegenden Erfindung, wobei das Detail a eine Seitenansicht des Schneidenbereichs und das Detail b eine perspektivische Ansicht einer Schneide in Vergrößerung zeigt.
Show it:
FIG. 1:
a clamshell grab with conventional cutting edges according to the prior art,
FIG. 2:
a clamshell grabber according to an embodiment of the present invention, wherein the detail a shows a side view of the cutting area and the detail b shows a perspective view of a cutting edge in magnification.

Figur 1 zeigt einen Zweischalengreifer 10 nach dem Stand der Technik, wobei die Schalen 12 und 14 gegenläufig mittels einer Kolbenzylindereinrichtung 16 um ein Tragstück 18 verschwenkbar sind. Im hier dargestellten Ausführungsbeispiel handelt es sich bei dem Zweischalengreifer um eine sogenannten Holzzange bei der beispielsweise aufeinandergelagerte Holzstämme gegriffen werden können. Der Zweischalengreifer weist im äußeren Kantenbereich jeweils Schneiden 20 bzw. 22 auf, die aus einem gehärteten Material, beispielsweise einem gehärteten Stahl bestehen. Die Schneiden sind an der entsprechenden Stelle der Schalen 12 zw. 14 eingeschweißt. Nach entsprechender Abnutzung müssen sie abgebrannt und durch neu einzuschweißende Schneiden ersetzt werden. FIG. 1 shows a clamshell grab 10 according to the prior art, wherein the shells 12 and 14 in opposite directions by means of a piston-cylinder device 16 about a support piece 18 are pivotable. In the exemplary embodiment illustrated here, the clamshell grab is a so-called wooden pliers in which, for example, stacked logs can be gripped. The clamshell gripper has in the outer edge region in each case cutting edges 20 and 22, which consist of a hardened material, such as a hardened steel. The cutting edges are welded at the corresponding point of the shells 12 zw. 14. After appropriate wear, they must be burned down and replaced with new welding edges.

Die Figur 2 zeigt eine Ausführungsvariante eines erfindungsgemäßen Grab- oder Greifwerkzeuges, das hier ebenfalls mit 10 bezeichnet ist. Es weist im wesentlichen den gleichen Aufbau der Zweischalengreifer gemäß Figur 1 auf. Allerdings sind hier die Schneiden 20 und 22 modifiziert. Sie weisen nämlich im vorderen Schneidenbereich, wie sich insbesondere auch aus den Figuren 2a und 2b ergibt, nebeneinander in Reihe angeordnete Rollenelemente 24, die zwischen senkrecht von der Schneide 20, 22 wegstehenden Stegen 26 drehbar gelagert sind, auf. Entsprechend der Ansicht in Figur 2a rollen die Rollen 24 der Schneide 20 auf dem Untergrund ab, während die Rollen der Schneide 24 während des Schließens des Zweischalengreifers 10 oberhalb der Rollen 24 der Schneide 20 liegen.The FIG. 2 shows an embodiment of a grave or gripping tool according to the invention, which is also designated here by 10. It essentially points the same structure of clamshell claws according to FIG. 1 on. However, here are the cutting edges 20 and 22 modified. They have namely in the front cutting area, as in particular from the FIGS. 2a and 2b results in juxtaposed in series roller elements 24 which are rotatably mounted between perpendicularly away from the cutting edge 20, 22 webs 26, on. According to the view in FIG. 2a roll the rollers 24 of the cutting edge 20 on the ground, while the rollers of the cutting edge 24 during the closing of the clamshell 10 above the rollers 24 of the blade 20 are.

Die Rollen 24 sind auf Wellen 28 drehbar gelagert, die von den Stegen festgelegt sind. Durch Abziehen der Wellen 28 können die Rollen leicht entnommen und durch neue Rollen 24 ersetzt werden.The rollers 24 are rotatably mounted on shafts 28 which are fixed by the webs. By removing the shafts 28, the rollers can be easily removed and replaced by new rollers 24.

Claims (3)

  1. Clamshell grab with a least two cutting edges (20, 22) working in opposite directions,
    characterized in that
    along the outer edge of the cutting edges (20, 22), rollers (24) are disposed next to one another in a row which are rotatably mounted between webs (26) perpendicularly protruding from the cutting edges, and in that the clamshell grab is suitable for digging works.
  2. Clamshell grab according to claim 1, characterized in that the cutting edges (20, 22) are welded on to the base body (12, 14) of the clamshell grab.
  3. Clamshell grab according to claim 1 or 2, characterized in that it is formed as a timber tongs.
EP05018585.9A 2004-09-06 2005-08-26 Clamshell bucket Active EP1632450B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE202004013842U DE202004013842U1 (en) 2004-09-06 2004-09-06 Digging or gripping tools

Publications (3)

Publication Number Publication Date
EP1632450A2 EP1632450A2 (en) 2006-03-08
EP1632450A3 EP1632450A3 (en) 2006-03-15
EP1632450B1 true EP1632450B1 (en) 2017-08-23

Family

ID=33483534

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05018585.9A Active EP1632450B1 (en) 2004-09-06 2005-08-26 Clamshell bucket

Country Status (4)

Country Link
US (1) US7357163B2 (en)
EP (1) EP1632450B1 (en)
CA (1) CA2517976C (en)
DE (1) DE202004013842U1 (en)

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US8567836B2 (en) * 2007-08-31 2013-10-29 Lavalley Industries, Llc Gripping assembly and gripping members for a grapple attachment
WO2009029879A2 (en) 2007-08-31 2009-03-05 Roger Lavalley Grapple attachment for use with drill pipes
US8393660B2 (en) * 2009-05-29 2013-03-12 Caterpillar Work Tools B.V. Gripping member for a work tool
US9021769B2 (en) * 2010-03-03 2015-05-05 Yuyama Mfg. Co., Ltd. Medicament dispensing machine
WO2012112863A2 (en) 2011-02-17 2012-08-23 Lavalley Industries, Llc Position adjustable grapple attachment
US9458949B2 (en) * 2011-08-18 2016-10-04 Richard S. McKinley Loading devices and methods of loading pipe fusion machines
CA2878955C (en) 2012-07-27 2020-06-30 Lavalley Industries, Llc Grab arm housing for grapple attachment
WO2014143933A1 (en) * 2013-03-15 2014-09-18 Anvil Attachments Particulate-handling bucket assembly
US8973244B2 (en) 2014-04-17 2015-03-10 Lavalley Industries, Llc Pipe processing tool with pipe deformation members
CN105239612A (en) * 2015-09-21 2016-01-13 常州市合达油泵有限公司 Rotatable bucket
DE202018000428U1 (en) * 2018-01-26 2018-02-15 Dms Technologie Gmbh Gripping attachment for gripping organs of a gripper
CN111302212A (en) * 2020-02-14 2020-06-19 合肥市春华起重机械有限公司 Steel coil lifting appliance device for unmanned crane and use method thereof
CN111761597A (en) * 2020-07-03 2020-10-13 中信机电制造公司科研设计院 Tiger mouth type manipulator

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Also Published As

Publication number Publication date
EP1632450A2 (en) 2006-03-08
US20060048851A1 (en) 2006-03-09
US7357163B2 (en) 2008-04-15
EP1632450A3 (en) 2006-03-15
CA2517976A1 (en) 2006-03-06
DE202004013842U1 (en) 2004-11-18
CA2517976C (en) 2013-01-08

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