EP1632450A2 - Excavating or gripping tool - Google Patents

Excavating or gripping tool Download PDF

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Publication number
EP1632450A2
EP1632450A2 EP05018585A EP05018585A EP1632450A2 EP 1632450 A2 EP1632450 A2 EP 1632450A2 EP 05018585 A EP05018585 A EP 05018585A EP 05018585 A EP05018585 A EP 05018585A EP 1632450 A2 EP1632450 A2 EP 1632450A2
Authority
EP
European Patent Office
Prior art keywords
gripping tool
rollers
grave
cutting
cutting edge
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP05018585A
Other languages
German (de)
French (fr)
Other versions
EP1632450A3 (en
EP1632450B1 (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.
  • 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.
  • the rollers have a larger wear volume. So here is a wear system created that has significantly longer regeneration intervals.
  • the regeneration, d. H. the processing of the cutting edge after appropriate wear much easier, since not the entire blade burned down and 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.
  • the solution according to the invention for a timber grab less wood is advantageously damaged, so that the quality assurance in the production process can be improved in a sawmill. In other areas of the application, a gentler gripping is possible.
  • 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 variant of a grave or gripping tool according to the invention, which is likewise denoted by 10 here. It essentially points the same structure of clamshell buckets according to Figure 1. However, here are the cutting edges 20 and 22 modified. Namely, they have in the front cutting area, as is apparent in particular from Figures 2a and 2b, side by side in series arranged roller elements 24 which are rotatably mounted between vertically away from the cutting edge 20, 22 webs 26, on. According to the view in Figure 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 cutting edge 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.

Abstract

A mechanical grab has two U-shaped pick-up members (12, 14) that make contact at their tips (20, 22). The tips are equipped with facing arrays of rollers (24) between adjacent fingers (26).

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.

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. Here, the regeneration, d. H. the processing of the cutting edge after appropriate wear much easier, since not the entire blade burned down and 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 timber grab less wood is advantageously damaged, so that the quality assurance in the production process can be improved in a sawmill. 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.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.FIG. 2 shows an embodiment variant of a grave or gripping tool according to the invention, which is likewise denoted by 10 here. It essentially points the same structure of clamshell buckets according to Figure 1. However, here are the cutting edges 20 and 22 modified. Namely, they have in the front cutting area, as is apparent in particular from Figures 2a and 2b, side by side in series arranged roller elements 24 which are rotatably mounted between vertically away from the cutting edge 20, 22 webs 26, on. According to the view in Figure 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 cutting edge 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 (5)

Grab- oder Greifwerkzeug mit mindestens einer Schneide,
dadurch gekennzeichnet,
daß entlang der Außenkante der Schneide Rollen angeordnet sind.Grave or gripping tool with at least one cutting edge,
characterized,
that rollers are arranged along the outer edge of the cutting edge. Grab- oder Greifwerkzeug nach dem Anspruch 1, dadurch gekennzeichnet, daß an der Außenkante der Schneide senkrecht Stege vorgesehen sind, zwischen denen die Rollen gelagert sind.Grabbing or gripping tool according to claim 1, characterized in that webs are provided perpendicularly to the outer edge of the cutting edge, between which the rollers are mounted. Grab- oder Greifwerkzeug nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß es als Zweischalengreifer ausgebildet ist, deren gegenläufige Schneiden mit Rollen ausgestattet sind.Digging or gripping tool according to claim 1 or 2, characterized in that it is designed as a clamshell gripper whose opposite cutting edges are equipped with rollers. Grab- oder Greifwerkzeug nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß es als Holzzange ausgebildet ist, deren gegenläufige Schneiden mit Rollen versehen sind.Grave or gripping tool according to claim 1 or 2, characterized in that it is designed as a wood tongs whose opposite cutting edges are provided with rollers. Grab- oder Greifwerkzeug nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß die Schneiden auf den Grundkörper des Grab-oder Greifwerkzeuges aufgeschweißt sind.Grave or gripping tool according to one of the preceding claims, characterized in that the cutting edges are welded onto the base body of the grave or gripping tool.
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 true EP1632450A2 (en) 2006-03-08
EP1632450A3 EP1632450A3 (en) 2006-03-15
EP1632450B1 EP1632450B1 (en) 2017-08-23

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EP05018585.9A Active EP1632450B1 (en) 2004-09-06 2005-08-26 Clamshell bucket

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

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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

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US8567836B2 (en) * 2007-08-31 2013-10-29 Lavalley Industries, Llc Gripping assembly and gripping members for a grapple attachment
CN101970792B (en) * 2007-08-31 2014-03-12 勒瓦利工业公司 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
WO2011108446A1 (en) * 2010-03-03 2011-09-09 株式会社湯山製作所 Medicine filling device
EP2675742B1 (en) 2011-02-17 2015-07-08 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
EP2877421B1 (en) 2012-07-27 2017-09-06 Lavalley Industries, LLC Grab arm housing for grapple attachment
MX2015012986A (en) * 2013-03-15 2016-05-10 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
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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US3301587A (en) * 1965-03-01 1967-01-31 Prentice Hydraulics Inc Materials positioning fork
US3393014A (en) * 1965-07-30 1968-07-16 Leonhard Ascher Jr. Attachment for an earth-moving machine
DE1992979U (en) * 1968-05-02 1968-08-29 Eisenwerk Draht Bremer G M B H HYDRAULICALLY ACTUATED LAMINATED WOOD BACKING UNIT FOR ATTACHING TO A TRACTOR, TRACTOR OR ANY OTHER VEHICLE.
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Also Published As

Publication number Publication date
CA2517976A1 (en) 2006-03-06
DE202004013842U1 (en) 2004-11-18
CA2517976C (en) 2013-01-08
EP1632450A3 (en) 2006-03-15
US20060048851A1 (en) 2006-03-09
US7357163B2 (en) 2008-04-15
EP1632450B1 (en) 2017-08-23

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