WO2014165896A1 - Élément de dent destiné à un ensemble de dent d'excavation - Google Patents

Élément de dent destiné à un ensemble de dent d'excavation Download PDF

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Publication number
WO2014165896A1
WO2014165896A1 PCT/AU2014/000017 AU2014000017W WO2014165896A1 WO 2014165896 A1 WO2014165896 A1 WO 2014165896A1 AU 2014000017 W AU2014000017 W AU 2014000017W WO 2014165896 A1 WO2014165896 A1 WO 2014165896A1
Authority
WO
WIPO (PCT)
Prior art keywords
lock
tooth member
tooth
yielding
engagement
Prior art date
Application number
PCT/AU2014/000017
Other languages
English (en)
Inventor
Mark Hurley
Reece Attwood
Original Assignee
Bradken Resources Pty Limited
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 Bradken Resources Pty Limited filed Critical Bradken Resources Pty Limited
Publication of WO2014165896A1 publication Critical patent/WO2014165896A1/fr

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
    • E02F9/2808—Teeth
    • E02F9/2816—Mountings therefor
    • E02F9/2833—Retaining means, e.g. pins
    • E02F9/2841—Retaining means, e.g. pins resilient

Definitions

  • the present disclosure relates to excavation tooth assemblies and to tooth members for engagement with a nose associated with an adapter or excavation equipment.
  • Excavation teeth are provided on the digging edge of various pieces of digging equipment such as the buckets of front end loaders.
  • Each excavation tooth is formed of a number of tooth members, commonly a point and an adapter and one or more locks for locking the tooth members together.
  • the adapter is typically fitted to the excavation equipment and the point fits over a nose of the adapter and is retained in place by the lock.
  • one or more intermediate tooth members may be also included between the point and the adapter.
  • the term "adapter" used in this specification includes both the adapter arranged to be fitted to the excavation equipment or, if one or more intermediate tooth members are provided, to that intermediate tooth member(s) or to the combination of the adapter and the intermediate tooth member(s).
  • nose used in this specification is a projecting portion to which a tooth member of the excavation tooth is mounted and includes a projecting portion on the excavation equipment to which the adapter is mounted, a projecting part on the adapter to which the point or intermediate tooth member is mounted and a projecting part on the intermediate tooth member to which the point or other tooth members are mounted.
  • the reason that the excavation tooth is formed of a number of parts is to avoid having to discard the entire tooth when only a part of the tooth, in particular the ground engaging part of the tooth (i.e. the point) is worn or broken.
  • Various types of locks, points and adapters are known. However, it is always desirable to design new excavation tooth assemblies and parts thereof.
  • the present disclosure relates to improvements in relation to tooth members adapted to engage with excavation equipment.
  • the present disclosure provides a tooth member of an excavation tooth assembly, the tooth member comprising:
  • a body extending along a longitudinal axis between first and second ends; a socket extending into the body from the second end for receiving a nose of the excavation tooth assembly in an assembled condition;
  • a lock engagement structure for engagement by a lock to lock the tooth member in its assembled condition with the nose, the lock engagement structure comprising a yielding region that is configured to preferentially yield under excessive loading so as to limit loading on the lock.
  • the present disclosure provides a locking system for an excavation tooth assembly comprising a tooth member having at least one wall defining an interior socket for receiving a nose of the excavation tooth assembly in an assembled condition, the locking system comprising:
  • a lock engagement structure mounted to or forming part of the tooth member; a lock engagable in a locking configuration with the lock engagement structure to lock the tooth member in its assembled condition with the nose;
  • a yielding region that is configured to preferentially yield under excessive loading so as to limit loading on the locking system.
  • an excavation tooth assembly comprising:
  • a tooth member having a socket for receiving the nose portion in an assembled condition
  • a lock engagement structure mounted to or forming part of the tooth member; a lock engagable in a locking configuration with the lock engagement structure to lock the tooth member in its assembled condition with the nose;
  • a yielding region that is configured to preferentially yield under excessive loading so as to limit loading on the lock.
  • the present disclosure provides a method of locking a tooth member onto a nose in an excavation tooth assembly, the method comprising; providing a locking system to lock the tooth member on the nose; and relieving stress in the locking system on excessive loading being induced in the tooth assembly by preferentially yielding of a portion of the locking system , whereby the locking system being arranged to remain operative after said
  • Fig. 1 is an exploded perspective view of an excavation assembly including a tooth member, a nose portion and a lock of one embodiment of the present disclosure.
  • Fig. 2 is a perspective view of the assembly of Fig. 1 with the lock received in the nose portion.
  • Fig. 3 is a perspective view of the assembly of Fig. 1 in an assembled condition with the tooth member mounted on the nose portion.
  • Figure 4 is a close up view of detail A of Fig. 1 , showing a lock engagement structure of the tooth member.
  • Figure 5 is a side view of the tooth member of Fig. 1
  • Figure 6 is a sectional view through B-B of the tooth member of Fig. 5.
  • an excavation tooth assembly comprising point tooth member that is mounted to a nose portion that is fixed to a bucket lip or other digging edge.
  • the nose portion may be part of an adapter or may be integrally formed to the digging edge.
  • an intermediate member which may also be referred to as an adapter
  • a lock is used to lock the point tooth member to the nose of the adapter or the nose integrally formed with the digging edge.
  • locks are used to lock the point to the intermediate member and the intermediate member to the nose formed with the digging edge or of the tooth member attached to the digging edge.
  • a tooth member of an excavation tooth assembly comprising: a body extending along a longitudinal axis between first and second ends; a socket extending into the body from the second end for receiving a nose of the excavation tooth assembly in an assembled condition; and
  • a lock engagement structure for engagement by a lock to lock the tooth member in its assembled condition with the nose, the lock engagement structure comprising a yielding region that is configured to preferentially yield under excessive loading so as to limit loading on the lock.
  • the yielding region will preferentially yield rather than the lock itself when excess loads are placed on the excavation tooth assembly and pass through the lock and the tooth member. This means that the lock is less likely to break in use. When locks do break in use, the broken parts can become jammed in the assembly, making the task of disassembly to replace the broken lock difficult and time consuming.
  • the lock engaging structure is preferably configured so that when the yielding region does yield, the integrity of the locking arrangement of the lock and the lock engagement structure remains.
  • the excavation tooth assembly is more robust and can carry on being used after experiencing excessive loading, which resulted in deformation of the lock engagement structure.
  • the lock engagement structure is arranged to plastically deform on yielding in a manner such that it remains capable of maintaining engagement with the lock to lock the tooth member in its assembled condition.
  • the yielding region is shaped to provide the
  • the yielding region is shaped to have a reduced thickness to provide the preferential yielding.
  • the yielding region has different material properties to other parts of the tooth member to provide the preferential yielding.
  • the lock engagement structure further comprises an engagement surface arranged to engage the lock.
  • the yielding region includes the engagement surface.
  • the body comprises a recess for receiving the lock in the assembled condition.
  • the lock engagement structure is disposed on or in a wall of the body defining said recess.
  • the yielding region is in the form of at least one protrusion that projects into the recess.
  • the engagement surface is formed on a side surface of the at least one protrusion and the at least one protrusion is arranged to move laterally on preferential yielding to limit loading on the lock.
  • the wall defining the recess has a rear surface and an opposite forward surface that is located towards the first end of the tooth member body relative to the rear surface, and wherein the at least one protrusion extends from the rear surface of the recess. In some embodiments, the at least one protrusion extends towards the forward surface of the recess.
  • the at least one protrusion extends from a mid section of the rear surface.
  • the rear surface comprises surface portions on either side of the at least one protrusion that converge towards each other.
  • each of the rear surface portions are at an angle of greater than 90° to the at least one protrusion. In some embodiments, wherein the at least one protrusion has a material thickness less than that of the wall defining the recess.
  • the recess extends through the body wall and is in communication with the socket.
  • the recess extends into the wall transverse to the longitudinal axis of the tooth member body.
  • the body further comprises a slot in the wall of the tooth member body defining the recess, the slot extending from the recess to an opening in the second end of the body.
  • the lock engagement structure is disposed on opposite sides of the slot.
  • the lock engagement structure comprises said at least one protrusion disposed on each of the opposite sides of the slot.
  • the slot is in communication with the socket.
  • the at least one protrusion when not having preferentially yielded, extends substantially parallel to the longitudinal axis of the tooth member and is configured to bend towards or away from said socket under yielding .
  • the at least protrusion is integral with the tooth member. In some embodiments, the at least one protrusion is attached to the tooth member.
  • a locking system for an excavation tooth assembly comprising a tooth member having at least one wall defining an interior socket for receiving a nose of the excavation tooth assembly in an assembled condition, the locking system comprising:
  • a lock engagement structure mounted to or forming part of the tooth member; a lock engagable in a locking configuration with the lock engagement structure to lock the tooth member in its assembled condition with the nose;
  • a yielding region that is configured to preferentially yield under excessive loading so as to limit loading on the locking system.
  • the lock engagement structure may be integrally formed with the tooth member or may be in the form of an insert or attachment that is attached to the tooth member.
  • the locking system further comprises a recess extending into the at least one wall of the tooth member; and wherein the lock is configured to extend into the recess in the locking configuration.
  • the yielding region forms part of the lock engagement structure.
  • the lock engagement structure is as otherwise described in any one of the above embodiments.
  • the lock comprises a locking element having an engagement portion and wherein the engagement portion is configured to engage an engagement surface of the lock engagement structure in the locking configuration.
  • the engagement portion comprises a profiled edge.
  • the locking element comprises an arm that is configured to extend from the nose into the recess, the arm having a head that defines the engagement portion.
  • the lock is configured to retract to bring the lock into engagement with the lock engagement structure in the locking configuration. In some embodiments, the lock is configured to extend to bring the lock into engagement with the lock engagement structure in the locking configuration.
  • the yielding region is arranged to plastically deform in a manner such that the lock engagement structure is capable of maintaining engagement with the lock to lock the tooth member in its assembled condition after preferential yielding.
  • the lock is capable of being adjusted to tighten the engagement between the locking structure and the lock after preferential yielding of the yielding region.
  • an excavation tooth assembly comprising: a nose portion;
  • a tooth member having a socket for receiving the nose portion in an assembled condition
  • a lock engagement structure mounted to or forming part of the tooth member; a lock engagable in a locking configuration with the lock engagement structure to lock the tooth member in its assembled condition with the nose;
  • a yielding region that is configured to preferentially yield under excessive loading so as to limit loading on the lock.
  • the tooth member further comprising a recess and wherein the lock is configured to extend into the recess in the locking configuration.
  • the yielding region forms part of the lock engagement structure.
  • the tooth member comprises a tooth member as described in any one of the above embodiments.
  • Disclosed in some embodiments is a method of locking a tooth member onto a nose in an excavation tooth assembly, the method comprising;
  • the method further comprises adjusting the locking system after the preferential yielding to tighten the lock between the tooth member and the nose.
  • the excavation tooth assembly 1 in the illustrated form comprises a point tooth member 10, a nose portion 22 to which the point 10 is mounted in an assembled condition and a lock 25 for locking the point in its assembled condition with the nose portion.
  • the point tooth member 10 comprises a body 40 that extends along a longitudinal axis between a first ground engaging end 41 and an opposite second end 42.
  • An interior socket 13 extends into the body 40 from an opening 43 in the second end.
  • the socket 13 is defined by facing side walls 1 1 and upper and lower walls 12 of the body 40. .
  • the interior socket 13 of the tooth member 10 is configured to allow the tooth member 10 to be mounted to the nose portion 20.
  • the nose portion 20 may be integrally formed with the lip of an excavation bucket or in other embodiments may have a bucket connection end extending therefrom to mount the nose portion to the bucket lip.
  • the bucket connection end typically comprises spaced apart legs which, in use, straddle either side of the lip.
  • the nose portion 22 is in the form of a narrowing protuberance and is configured and positioned to bear the point tooth member 10 by fitting into the point's socket 13 in an assembled condition.
  • the nose portion 22 has a cavity 35 in which the lock 25 is positioned for locking the point tooth member 10 to the nose portion 22.
  • the lock 25 comprises a sleeve 26 that is positioned within the nose cavity 35 and a locking element in the form of a locking arm 36 that is mounted to and extends from the sleeve 26.
  • the locking arm 36 projects beyond the nose portion 22 to engage the point tooth member 10 to lock the point 10 in its assembled condition with the nose portion 22.
  • the arm At the distal end of the arm 36 to the sleeve 26, the arm has a head 28 which has a profiled or asymmetrical shape and defines an engagement portion 29 for engaging the point tooth member 10.
  • the locking arm 36 is operable to translate with respect to the sleeve 26 between extended and retracted configurations.
  • the locking arm 36 is retracted from its extended configuration to bring the engagement portion 29 into engagement with the point tooth member 10.
  • the lock may be configured so that the locking arm is extended from its retracted configuration to bring the engagement portion into engagement with the point tooth member.
  • the point tooth member 10 comprises a lock engagement structure 50 for the lock 25, in particular the engagement portion 29 on the head 28 of the locking element to engage to lock the point tooth member 10 to the nose portion 22.
  • the lock engagement structure 50 is provided in a recess in the form of an aperture 15 that extends, transversely to the longitudinal axis of the tooth body 40, into one of the side walls 1 1 of the socket 13. It is noted that in other embodiments, the aperture could be formed in any of the upper, lower or side walls 1 1 , 12 of the socket.
  • the aperture 15 is open to and in communication with the socket which enables the locking arm 36 to extend into the aperture 15 from the nose portion 22.
  • the aperture 15 also has an opening through the external surface of the side wall 1 1 which provides access to the lock 25 when the excavation tooth assembly 1 is assembled.
  • the lock engagement structure 50 comprises a yielding region in the form of a plastically deformable protrusions 17 located in the aperture 15.
  • the protrusions 17 extend from a rear surface 51 of the aperture 15 towards a forward surface 52 of the aperture substantially parallel to the longitudinal axis of the body 40 and substantially radially with respect to the aperture 15.
  • the protrusions 17 are thinner than the side wall 1 1 of the point body and extend from a mid section of the rear surface 51 of the aperture 15, mid way between the inner and outer surfaces of the side wall 1 1 that defines the socket 13.
  • the protrusions together with the outer part of the rear surface 51 of the aperture 15 (which extends away from each of the protrusions at an angle greater than 90°) form an engagement surface for the engagement portion 29 of the lock 25 to engage to lock the point 10 to the nose portion 22 when it is retracted from its extended configuration.
  • the engagement portion 29 of the lock 25 engages the inner part of the rear surface 51 of the aperture that extends away from the protrusion (also at an angle greater than 90°).
  • the protrusions 17 are designed to allow for deformation when excessive loading is placed on the lock 25, particularly from side impact loadings on the point tooth member 10 (ie. loadings received transversely to the longitudinal axis of the point tooth member).
  • the protrusions 17 are configured to deform in preference to the lock, in particular its locking arm 36, when loads above a particular limit are placed on the lock and are transferred through to the protrusions.
  • the protrusions are formed of a material that is bendable and/or are sized and shaped such that the material allows for bending.
  • the protrusions 17 are integral with the tooth member 10 and are formed of the same material.
  • the protrusions may be attached to the tooth member 10 by for example welding.
  • the protrusions may be formed of a different material to that of the tooth member, having a lower yield strength.
  • the protrusions 17 are narrower in cross section than the side walls 1 1 of the tooth member which in itself provides flexion for the protrusions.
  • the protrusions also each taper as they extend from the rear surface 51 of the side wall 1 1.
  • the protrusions may be provided with portion that is weakened for example by appropriate material treatment steps or by making that portion of the protrusion thinner to facilitate bending of the protrusion about this weakened portion.
  • the lock engagement structure may be designed such that the protrusion itself does not deform, but rather the yielding region incorporates a portion of the tooth member to which the protrusion connects which yields under excessive loads.
  • the protrusion may be moved by deformation of this portion.
  • the head 28 of the locking arm 36 engages on the outer side of each protrusion 17 (relative to the socket 13).
  • the protrusions 17 deform under loading from the lock 25 they bend inwardly towards the socket 13.
  • the lock 25, in particular the head 28 of the locking arm 36 does not break engagement with the lock engagement structure 50 of the tooth member 10. Accordingly, even after such deformation due to excessive loading, the integrity of the locking arrangement to hold the tooth member 10 on the nose portion 22 remains.
  • the point 10 also comprises a slot 16 that extends from the aperture 15 to an opening 56 at the second end 42 of the point body 40.
  • the slot 16 is open to and communicates with the socket 13 and, in the illustrated embodiment, is also open through the external surface of the side wall 1 1.
  • the slot 16 extends between the protrusions 17 such that they are located on opposite sides of the slot. The purpose of the slot 16 is to enable mounting and dismounting of the point 10 over the nose portion 22 with the lock 25 residing in the nose cavity 35 and extending outwardly therefrom.
  • the recess in the form of the aperture 15 is aligned with a secondary recess also in the form of an aperture 18 on the facing side wall 1 1 of the tooth member 10 to create a passage through the side walls 1 1 and the socket 13.
  • the shapes of the aperture 15 and secondary aperture 18 are, in the illustrated form, distinct from one another because they have different purposes.
  • the secondary aperture 18 is defined by the side walls 1 1 and is in the form of a hole that is circular or ovaloid.
  • the secondary aperture 18 provides tooling access to the lock 25 to adjust the lock between its extended and retracted configurations. Because in the illustrated embodiment the lock has only a single locking arm, the secondary aperture 18 can be shaped in the manner shown.
  • the secondary aperture may also be part of a lock engagement structure and is shaped in a substantially identical manner to the aperture 15 of the lock engagement structure 50.
  • the yielding region comprises a protrusion on the tooth member
  • the yielding region could take other forms.
  • the yielding region may be a portion of one of the socket walls that is configured to preferentially depress or crumple under excessive loads.
  • the yielding region may be provided on the lock and may comprise for example a deformable part of the lock head 28 which preferentially deforms rather than the lock arm.
  • the lock head plastically deforms in a manner which still enables the lock head to be easily removed from the aperture 15 in the wall of the point tooth member.
  • the lock 25, in particular it's sleeve 26, is inserted into the cavity 35 of the nose portion 22 such that the sleeve 26 is housed within the cavity.
  • the lock 25 is in an extended configuration or is adjusted into an extended configuration so that the locking arm 36 extends outwardly from the surface of the nose portion 22.
  • Tooth member 10 is then moved over the nose portion 22 with the arm 36 of the lock moving through the slot 16 and into the aperture 15.
  • the tooth member 10 is positioned on the nose portion 22 with the nose portion 22 located within the socket 13 and the locking arm 36 of the lock 25 extending into the aperture 15.
  • the locking arm 36 is retracted into the sleeve 26 by rotating an actuator (not shown) of the lock 25 which is housed in the sleeve and is connected to the locking arm.
  • the arm 36 itself is inhibited against rotating. Rotating of the actuator is carried out by engaging a tool with the actuator via secondary aperture 18.
  • the lock 25 may be subjected to high loads which are passed into the protrusions 17 which will preferentially yield if those loads are excessive to mitigate against the lock, in particular the locking arm 36 failing.
  • the lock 25 can still engage the lock engagement structure 50 and maintain the assembled configuration of the point tooth member on the nose portion.
  • the excavation tooth assembly 10 is disassembled, for example to replace a worn or broken part, essentially by the reverse of the assembly process. If the protrusions 17 have been deformed during use, they may be straightened when the point tooth member 10 is removed from the nose portion 22 using appropriate tooling such as a hammer and wedge for example.

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Component Parts Of Construction Machinery (AREA)

Abstract

L'invention concerne un élément de dent d'un ensemble de dent d'excavation, l'élément de dent comprenant : un corps s'étendant le long d'un axe longitudinal entre des première et seconde extrémités ; une douille s'étendant dans le corps à partir de la seconde extrémité pour recevoir un nez de l'ensemble de dent d'excavation dans un état assemblé ; et une structure de mise en prise de verrouillage pour mise en prise par un verrouillage pour verrouiller l'élément de dent dans son état assemblé avec le nez, la structure de mise en prise de verrouillage comprenant une région de déformation élastique qui est conçue pour céder préférentiellement sous une charge excessive de façon à limiter la charge sur le verrouillage.
PCT/AU2014/000017 2013-04-12 2014-01-13 Élément de dent destiné à un ensemble de dent d'excavation WO2014165896A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU2013204644A AU2013204644A1 (en) 2013-04-12 2013-04-12 Tooth Member for Excavation Tooth Assembly
AU2013204644 2013-04-12

Publications (1)

Publication Number Publication Date
WO2014165896A1 true WO2014165896A1 (fr) 2014-10-16

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ID=51688715

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU2014/000017 WO2014165896A1 (fr) 2013-04-12 2014-01-13 Élément de dent destiné à un ensemble de dent d'excavation

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AU (1) AU2013204644A1 (fr)
WO (1) WO2014165896A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070137072A1 (en) * 2003-04-30 2007-06-21 Esco Corporation Releasable coupling assembly
WO2012012828A1 (fr) * 2010-07-29 2012-02-02 Bradken Resources Pty Limited Ensemble dent d'excavation
US20120030975A1 (en) * 2008-12-08 2012-02-09 Sandvik Intellectural Property AB Failure mechanism for mechanical connection

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070137072A1 (en) * 2003-04-30 2007-06-21 Esco Corporation Releasable coupling assembly
US20120030975A1 (en) * 2008-12-08 2012-02-09 Sandvik Intellectural Property AB Failure mechanism for mechanical connection
WO2012012828A1 (fr) * 2010-07-29 2012-02-02 Bradken Resources Pty Limited Ensemble dent d'excavation

Also Published As

Publication number Publication date
AU2013204644A1 (en) 2014-10-30

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