EP3289144A1 - Tête de coupe comportant un adaptateur remplaçable - Google Patents

Tête de coupe comportant un adaptateur remplaçable

Info

Publication number
EP3289144A1
EP3289144A1 EP16733735.1A EP16733735A EP3289144A1 EP 3289144 A1 EP3289144 A1 EP 3289144A1 EP 16733735 A EP16733735 A EP 16733735A EP 3289144 A1 EP3289144 A1 EP 3289144A1
Authority
EP
European Patent Office
Prior art keywords
tool
recess
transverse
cutter head
head
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.)
Withdrawn
Application number
EP16733735.1A
Other languages
German (de)
English (en)
Inventor
Klaas Geert Wijma
Cornelis Martinus Petrus WEMPE
Paul BAHRAMIAN
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.)
Leo Dynamische Investering BV
Original Assignee
Leo Dynamische Investering BV
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 Leo Dynamische Investering BV filed Critical Leo Dynamische Investering BV
Publication of EP3289144A1 publication Critical patent/EP3289144A1/fr
Withdrawn legal-status Critical Current

Links

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
    • E02F9/28—Small metalwork for digging elements, e.g. teeth scraper bits
    • E02F9/2866—Small metalwork for digging elements, e.g. teeth scraper bits for rotating digging elements
    • 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
    • E02F9/28—Small metalwork for digging elements, e.g. teeth scraper bits
    • E02F9/2808—Teeth
    • E02F9/2816—Mountings therefor
    • E02F9/2825—Mountings therefor using adapters
    • 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
    • E02F9/28—Small metalwork for digging elements, e.g. teeth scraper bits
    • E02F9/2808—Teeth
    • E02F9/2816—Mountings therefor
    • E02F9/2833—Retaining means, e.g. pins
    • E02F9/2841—Retaining means, e.g. pins resilient

Definitions

  • the invention relates to a cutter head for an excavating device comprising at least one blade with a recess, the blade comprising around the recess an a axial supporting surface, a tool holder and a tool, the tool holder engaging with the tool and having a holder shaft that is seated in the recess and a transverse head having a contact surface engaging with the axial supporting surface, the tool holder being removably attached to the blade via a connector member.
  • the invention also relates to a blade, a tool holder and a tool for use in such a cutter head. Background of the invention
  • Such a cutter head is known from WO2013/180615, in which a cutter head for a dredger is described having tool holders, or "adapters” carrying the teeth that can be easily released from the cutter head blades via a bolted connection of the lower end of the holder shaft.
  • the bolted connection is accessible via an opening in the blades and needs to be disconnected and re-attached via a purpose-built tool.
  • connection of the known adapters has as a disadvantage that fastening and unfastening of the adapters through the hole in the blades in difficult in view of the confined space and requires a dedicated hydraulic tool. Furthermore, the presence of a hole in the blades was found to weaken the strength of the blades.
  • a cutter head according to the pre-amble of claim 1 is known from US patent application no. US 2005/0150666 showing a fixing device for a shank chisel in which a tool holder is clamped into a recess in a base element via a bracing element and a bolt.
  • the tool holder can be replaced in an easy manner by releasing the bolt that can be accessed from an outwardly facing side of the device.
  • the very stiff clamping connection of the tool holder may lead to damage when large forces, such as occur for instance during dredging in hard soil layers, are exerted on the chisel.
  • the cutter head according to the invention is characterized in that an axial liner is provided on the supporting surface near the recess, wherein the bolt clamps the contact surface of the transverse head against the liner on the axial supporting surface while a play is present between the shaft and a wall of the recess.
  • the transverse head is in this way firmly fixed and supported on the blade while being easily accessible for exchange, without requiring a hole in the blade.
  • the strength of the blades is improved.
  • the axial liner is easily accessible for repair or replacement on the outer blade surface after removal of the adapter from the recess.
  • clamping fastening at the top end of the adapter prevents micro movements of the shaft at the place of contact, which is at the liner locations, and hence reduces wear.
  • the axial liner that is provided between the axial supporting surface of the blade and the contact surface of the transverse head may be formed of a relatively wear resistant metal such as HARDOX ® and is replaced upon wear.
  • a radial liner may also be provided inside the recess near the clamping device.
  • the axial liner is provided with an axial recess and the transverse head comprises an axially extending part that is received in the recess for preventing rotation of the shaft.
  • the tool holder can be easily aligned and given the proper angular orientation upon insertion into the recess in the blade by placing the axially extending part in the recess of the axial liner. In this manner rotation of the tool holder is prevented and wear is further reduced.
  • the clamping device comprises a spring member pressing the contact surface of the transverse head against the axial supporting surface. In this manner a close and play-free contact between the adapter and the blade can be achieved.
  • the holder shaft may at a lower end be received with play in a bush that engages with its outer surface substantially without play with a lower part of the recess, no axial passage for access to the bush being provided in the blade.
  • the reaction forces on the lower end of the holder shaft (the adapter) are now transferred to the blade through the bush-shaped liner.
  • the shape of the bush is smooth and can be concave or convex and can have a circular, oval, rectangular triangular, or polygonal cross-section. The same applies to the cross-section of the holder shaft.
  • the transverse head has a front lateral groove and a transverse groove, substantially transversely thereto that is near the clamping member provided with a tensioning device for releasably engaging with a middle part of the tool and pulling it in a rearward direction toward the clamping device such that a front transverse part of the tool engages with the front lateral groove.
  • the tools - such as teeth - can be easily connected and disconnected from the tool holder.
  • Alternative tools may be used in combination with the inventive adapter, such as for instance teeth having a T-shaped cross-section but also other shaped cross-sections and comprising different materials depending on the material that is to be excavated.
  • Fig. 1 shows a perspective view of a cutter head comprising easily releasable tool holders according to the invention
  • Fig. 2 shows a partly cut-away view of a blade carrying a tool holder according to the invention
  • Fig. 3 shows a cross-sectional view through the tool holder of fig. 2 and
  • Fig. 4 shows an exploded view of the clamping device and liners according to the invention.
  • a cutter head 1 for an excavating device, in this case a dredger.
  • the cutter head 1 comprises a base ring 2 and a central hub 3 between which a number of blades 10, 10', 10" extend in a spiral-shaped form.
  • Each blade 10-10" has a spine 11 and an edge surface 8 having multiple recesses 12,12', 12" therein that extend into the blade in a direction perpendicular to the edge surface 8 and more or less parallel to the spine 11.
  • a tool holder 13, 13', 13" is releasably received.
  • the tool holders 13-13" each carry a tool, in this case a tooth 14,14', 14".
  • the tools can have different shapes and hardness, depending on the environment and soil type with which they come into contact.
  • the teeth 14-14" can be released from the tool holders 13-13" while the tool holders remain attached to the blades 10-10" via the recesses 12-12".
  • the rate of wear of the teeth 14-14", and consequently the frequency of replacement, is higher than that of the tool holders 13-13" by for instance a factor 10.
  • Each tool holder 13 has a holder shaft 15 and a transverse head 16.
  • the transverse heads 16 are provided with a transverse groove 17 in which the tooth 14 is received.
  • the shaft 15 can flex within the recess 12-12".
  • the transverse head 16 has a contact surface 18, 18' that rests on an axial supporting surface 19, 19' of the blade 10, near the recess 12.
  • a clamping device 20 is formed by a connector member 21 that is welded onto the blade 10.
  • the connector member 21 has an angled abutment surface 22 against which a
  • the orientation of the angled surfaces 22,23 is at an angle less than 90° relative the supporting surface 19', 19', for instance between 80° and 45°.
  • Two spring-loaded bolts 24,25, each carrying a spring 26, 27, extend through aligned holes on the surfaces 22, 23 and clamp the transverse head 16 with its contact surfaces 18,18' against the axial supporting surfaces 19,19' of the blade 10, substantially without play, via an intermediate axial liner 30.
  • the clamping device 20 By action of the clamping device 20, the holder shaft 15 is furthermore pressed into contact with radial liners 31, 31 ' that are provided inside the recess 12, and at a lower end 32 of the shaft 15, a bush 33 is pressed against the inside of the lower end of the recess 12.
  • the recess 12 has a downwardly tapering shape.
  • the transverse head 16 is provided with an axially extending part 35 that fits into a recess 36 in the axial liner 30, as can best be seen in fig. 4.
  • the tooth 14 that is shown in this embodiment, is provided with a front lateral part 40 that fits into a front lateral groove 41 in the transverse head 16.
  • a central part 46 of the tooth extends in the transverse groove 17 in the head 16 and is at a rear end 42, near the clamping device 20, provided with a hook member 43.
  • a complementary hook member 44 attached to the transverse head 16 via bolt connection 45 releasably pulls the tooth 14 with its front lateral part 40 against the front lateral groove 41.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Milling Processes (AREA)
  • Cutting Tools, Boring Holders, And Turrets (AREA)

Abstract

La présente invention concerne une tête de coupe (1) pour un dispositif d'excavation. La tête de coupe a au moins une lame (10-10'') avec un évidement (12-12'') et une surface de butée angulaire (22). Un outil a un arbre de support (15) s'adaptant dans l'évidement et une tête transversale (16) connectée par l'intermédiaire d'un boulon (24, 25) serrant la surface de contact (18, 18') de la tête transversale (16) contre une garniture (30) sur la surface de support axial (19, 19') tout en laissant un jeu entre l'arbre (15) et l'évidement (12, 12''). Fig. 2:
EP16733735.1A 2015-05-01 2016-04-28 Tête de coupe comportant un adaptateur remplaçable Withdrawn EP3289144A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL2014748A NL2014748B1 (en) 2015-05-01 2015-05-01 Cutter head with a replaceable adapter.
PCT/NL2016/050300 WO2016178562A1 (fr) 2015-05-01 2016-04-28 Tête de coupe comportant un adaptateur remplaçable

Publications (1)

Publication Number Publication Date
EP3289144A1 true EP3289144A1 (fr) 2018-03-07

Family

ID=53540799

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16733735.1A Withdrawn EP3289144A1 (fr) 2015-05-01 2016-04-28 Tête de coupe comportant un adaptateur remplaçable

Country Status (3)

Country Link
EP (1) EP3289144A1 (fr)
NL (1) NL2014748B1 (fr)
WO (1) WO2016178562A1 (fr)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29822369U1 (de) * 1998-12-16 1999-03-18 Wagener Helmut Vorrichtung zur Halterung eines Werkzeuges
DE10221764C1 (de) * 2002-05-15 2003-11-27 Wirtgen Gmbh Halterung für einen Schaftmeißel
SE538940C2 (sv) * 2012-05-30 2017-02-28 Combi Wear Parts Ab Verktyg och verktygshållare för mudderverk

Also Published As

Publication number Publication date
NL2014748B1 (en) 2017-01-25
WO2016178562A1 (fr) 2016-11-10
NL2014748A (en) 2016-11-07

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