EP3775408A1 - Baggerzahn für einen schaufelradbagger - Google Patents
Baggerzahn für einen schaufelradbaggerInfo
- Publication number
- EP3775408A1 EP3775408A1 EP19713780.5A EP19713780A EP3775408A1 EP 3775408 A1 EP3775408 A1 EP 3775408A1 EP 19713780 A EP19713780 A EP 19713780A EP 3775408 A1 EP3775408 A1 EP 3775408A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tooth
- receiving shaft
- excavator
- tooth head
- receiving
- 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
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
Definitions
- the present invention relates to an excavator tooth for a bucket of a bucket wheel excavator, with a tooth head for engaging in the grave material and with a receiving shaft for mounting in or on a receptacle of a blade of a bucket wheel excavator.
- CN 202450568 U discloses a bucket tooth for a bucket of an earthmoving machine, such as a bucket wheel excavator.
- the excavator tooth has a tooth tip and a receiving shaft, and the tooth tip is for engaging the digging material and the receiving shaft is for placement in or on a receptacle of the bucket of the bucket wheel excavator.
- the tooth head has a material that is different from the material of the receiving shaft, and for renewal of the tooth head this can be solved by the receiving shaft.
- For attachment of the tooth head on the receiving shaft is a bolt connection.
- the bolt connection for applications of a bucket wheel excavator is only conditionally suitable when very hard grave materials are present, for example, rocks with a strength of 10 MPa to 20 MPa and above.
- the result is often a failure of the excavator tooth, when the tooth head breaks off from the receiving shaft.
- US Pat. No. 5,224,282 A discloses a further excavator tooth for a bucket of an excavator, which, for example, also serves for use in open-pit mining.
- the tooth head is also connected to the receiving shaft via a bolt connection, which can also fail if very hard grave material is present.
- Similar connections between a tooth head and a receiving shaft are furthermore known from DE 37 20 855 C1, from EP 0 681 630 B1.
- the well-known excavator teeth with a tooth head and a receiving shaft has in common that in connection with plug-secured plug systems, the connection between the tooth head and receiving shaft can experience a relaxation during operation, so that as the wear progresses, the tooth head becomes increasingly mobile on the receiving shaft. This accelerates the wear and the tooth head can break off from the shank.
- Increasing the accuracy of fit of the connector between the tooth head and receiving shaft also increases the production cost, since the plug-in system must be closely tolerated, and especially for longer conical connections with a smaller cone angle complex manufacturing processes are necessary.
- simple fit joints with forged or cast surfaces are often not sufficient to effectively prevent a loosening of the tooth head on the receiving shaft during prolonged operation.
- the object of the invention is the development of an excavator tooth for the blade of a bucket wheel excavator with a tooth head and a receiving shaft, wherein the tooth head and the receiving shaft have as different materials and wherein the compound should be designed as mechanically highly resilient.
- the invention includes the technical teaching that the tooth head and the receiving shaft to form the excavator tooth are materially interconnected.
- the core of the invention is a simple construction of an excavator tooth with a material connection between the tooth tip and the Shank based on a welded joint. It has been found that with a corresponding dimensioning of the welded joint, a sufficient strength of the connection between the tooth head and the receiving shaft can be created so that even very hard grave materials can be removed without causing a failure of the excavator tooth.
- the main advantage of this is that the tooth head and the receiving shaft need not have the same materials, and the tooth head and the receiving shaft can be manufactured with different manufacturing processes. Thus, there is advantageously the possibility that the tooth head has a higher hardness than the receiving shaft and that the receiving shaft has a higher toughness than the tooth head.
- the tooth tip may be made by a casting method, and the receiving shaft may be made by a forging method.
- the tooth head can also have recessed hard metal flakes, and the tooth head can be hardened with a heat treatment method; in particular, hardening of the tooth head can be provided without this heat treatment also having to find application for the receiving shaft. If the receiving shaft is produced by forging, this can be produced with a high quality at low cost in high quantities. In addition, it is possible to interpret the geometric tolerances of the receiving shaft much narrower than the geometric tolerances of the tooth head.
- the tooth head has a receiving surface, which rests on an end face of the receiving shaft for connecting the tooth head with the receiving shaft.
- a receiving surface which rests on an end face of the receiving shaft for connecting the tooth head with the receiving shaft.
- two planar surfaces may be opposite, which are formed by the receiving surface and the end face, and the two surfaces may be provided at least partially externally circumferentially with a weld.
- the particular advantage of the receiving surface and the end face is that these surfaces do not necessarily have to be machined, and a surface that is produced by a casting process or a forging process can already allow a sufficiently accurate plan system, especially when forging the example Shaft receiving a calibration step is included. As a result, the manufacturing costs for the production of the excavator tooth are further reduced.
- weld bevels and the like can be edited, for example by grinding or over-milling.
- high accuracy requirements do not have to be met.
- the important thing is that a scaling is released from the surface before the weld is to be made.
- the receiving surface and the end face are complementary to each other and formed at a compound of the tooth head with the receiving shaft, the complementary to each other surfaces trained plan abut each other.
- the receiving surface and the end face are flat, but it is also conceivable that the receiving surface and the end face are crowned or concave or provided in any other way with a topography.
- the receiving surface on the tooth head has a projection and that the end face of the receiving shaft has a recess, so that engages in a connection of the tooth head with the receiving shaft of the projection in the recess.
- the arrangement of the tooth head on the receiving shaft is facilitated and a correct orientation of the tooth head on the receiving shaft is basically already ensured, so that subsequently the production of the welded connection can take place.
- the recess may be provided on the receiving surface and on the end face of the projection may be provided.
- the projection particularly advantageously has a roof surface, and the roof surface is delimited by side surfaces which can rest against side surfaces of the recess in which the side surfaces on the projection and the side surfaces on the recess are complementary to one another.
- the complementary training in the context of the invention relates to a key-lock principle or a spring-groove principle, in particular such that the complementary mutually formed surfaces can lie substantially flat against each other.
- the side surfaces of the projection and the side surfaces of the recess each form three on the projection and on the recess opposite contact surfaces which are formed so that they form a truncated pyramid and all contact surfaces of the projection complementarily rest on the contact surfaces of the recess gapless to a to enable direction-changing power transmission. If the side surfaces of the projection and the side surfaces of the recess are brought into abutment with each other, the side surfaces on the projection can form a portion of the weld area, with which the side surfaces protrude from the recess on the projection, and thereby creates a circumferential weld gap between the tooth head and the receiving shaft.
- the welding gap has, for example, a triangular cross-sectional area, so that the weld can be generated in a simple manner from the outside, in particular completely, and so that high transverse forces can be transmitted between the tooth head and the receiving shaft.
- Another advantage of the circumferential weld is that it can be separated with a corresponding tool to solve the tooth head of the receiving shaft again, in particular to provide the excavator tooth with a new or renewed tooth head. Subsequently, the weld can be restored again.
- the invention is further directed to a method for renewing an excavator tooth on a blade of a bucket wheel excavator, wherein the tooth head and the receiving shaft of the excavator tooth are materially connected to one another, namely, welded.
- the method provides that the excavator tooth is first removed from the blade of the bucket wheel excavator, followed by a separation of the formed by a weld material connection between the tooth head and the receiving shaft along the end face of the receiving shaft, followed by the gapless positioning of a new or renewed Tooth head on the end face of the receiving shaft and finally there is a new cohesive joining of the new or renewed tooth head with the existing, ie already existing and previously used receiving shaft, wherein the cohesive connection is formed by means of a welded joint.
- the separation of the cohesive connection between the tooth head and the receiving shaft can be carried out, for example, with a cutting-off device, especially since the cohesive connection is designed as a welded connection.
- the cohesive connection is designed as a welded connection.
- Fig. 1 shows a first embodiment of an excavator tooth with a
- Fig. 2 is a view of the excavator tooth with a tooth head, on the
- Fig. 3 is a view of a second embodiment of the excavator tooth with a tooth head and a receiving shaft, wherein the receiving surface of the tooth head a projection and the end face of the receiving shaft having a recess and Fig. 4 is an excavator tooth in a cross-sectional view according to the
- FIG. 1 shows a perspective view of an excavator tooth 1 with a tooth head 10 and with an isolated receiving shaft 11.
- the tooth head 10 has a receiving surface 12 and extends over the receiving surface 12 approximately in the shape of a truncated pyramid.
- the receiving shaft 11 has an end face 13, and the receiving surface 12 is for abutment with the end face 13 in order to connect the tooth head 10 with the receiving shaft 11.
- the two surfaces are formed complementary to each other, and the mutually complementary, i. Matching design is provided according to the embodiment shown in such a way that the receiving surface 12 and the end face 13 can be brought to rest flat against each other.
- the receiving surface 12 is bounded with a weld bevel 14, so that the flat surface 12 is smaller than the flat surface of the end face 13. If the receiving surface 12 and the end face 13 brought flat to each other, created by the weld bevel 14 a circumferential, triangular throat, for welding the Tooth head 10 can be filled with the receiving shaft 11 with weld metal.
- Fig. 2 shows the crushing tooth 1 with the tooth head 10, which is connected to the receiving shaft 1 1 with a weld 21.
- the weld 21 surrounds the receiving surface 12 and the end face 13, so that even very large forces from the tooth head 10 on the receiving shaft 1 1 can be transmitted.
- the excavator tooth 1 allows the selection of the material for the tooth head 10 regardless of the selection of the material for the receiving shaft 11.
- the manufacturing process for the preparation of the tooth head 10 and the production of the receiving shaft 11 can be chosen differently.
- the tooth head 10 a have much higher hardness than the receiving shaft 1 1 to withstand contact with, for example, very hard grave material.
- the receiving shaft 1 1 has a material which has a very high toughness, which is higher than the toughness of the tooth head 10.
- the tooth head 10 may be manufactured by means of a casting process, however, the receiving shaft 11 may be made by a forging process.
- Fig. 3 shows another embodiment of the excavator tooth 1 with a tooth head 10 and with a receiving shaft 11, wherein the tooth head 10 and receiving shaft 11 are shown separated from each other in perspective.
- the embodiment shows the tooth head 10 with a receiving surface 12 which includes a projection 15, and the end face 13 of the receiving shaft 1 1 has a recess 16. If tooth tip 10 and receiving shaft 1 1 joined together, so the projection 15 can engage in the recess 16, as shown in Fig. 4.
- the projection 15 has a roof surface 17, and the roof surface 17 is limited with side surfaces 18 which are complementary to side surfaces 19 of the recess 16.
- the weld 21 can be generated in a triangular, circumferential groove, which is formed by the geometric configuration of the side surface 18 of the projection 15 and the side surfaces 19 of the recess 16.
- the side surfaces 18 have a wider dimension than the side surfaces 19 of the recess 16, so that when arranging the projection 15 in the recess 16, the side surfaces 18 project beyond a circumferential, the recess 16 bordering flat surface.
- the advantage of the formation of the receiving surface 12 with the projection 15 and the end face 13 with the recess 16 is that in the sense of a tongue and groove depression a precisely fitting arrangement of the tooth head 10th to the Shaft 1 1 can be done so that subsequently the weld 21 is produced in a simple manner.
- the weld 21 can be separated, for example with a cutting machine. Subsequently, a new or a renewed tooth head 10 can be provided, which is arranged on the existing receiving shaft 1 1 by generating a new weld 21 again.
Landscapes
- 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
Description
Claims
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| RS20250502A RS66822B1 (sr) | 2018-03-28 | 2019-03-26 | Zub za iskop za rotorni bager |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102018204775.8A DE102018204775A1 (de) | 2018-03-28 | 2018-03-28 | Baggerzahn für einen Schaufelradbagger |
| PCT/EP2019/057512 WO2019185587A1 (de) | 2018-03-28 | 2019-03-26 | Baggerzahn für einen schaufelradbagger |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP3775408A1 true EP3775408A1 (de) | 2021-02-17 |
| EP3775408B1 EP3775408B1 (de) | 2025-03-12 |
Family
ID=65951581
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19713780.5A Active EP3775408B1 (de) | 2018-03-28 | 2019-03-26 | Baggerzahn für einen schaufelradbagger |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP3775408B1 (de) |
| DE (1) | DE102018204775A1 (de) |
| RS (1) | RS66822B1 (de) |
| WO (1) | WO2019185587A1 (de) |
Family Cites Families (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2740212A (en) * | 1955-09-30 | 1956-04-03 | Dwight E Werkheiser | Rooter tooth assembly |
| US3606471A (en) * | 1969-03-25 | 1971-09-20 | Jetco Inc | Trenching devices |
| WO1983000826A1 (en) * | 1981-09-08 | 1983-03-17 | Leonard, James, F. | Tool for installing scarifier teeth |
| DE3500261C2 (de) * | 1985-01-05 | 1987-01-29 | Bergwerksverband Gmbh, 4300 Essen | Meißel für das Schneiden von mineralischem Rohstoff |
| EP0259620A1 (de) * | 1986-09-09 | 1988-03-16 | Kennametal Inc. | Schneidwerkzeug mit harter Spitze mit einem Mittelstück, dessen Oberfläche als Umdrehungskörper mit konkaver Erzeugender ausgebildet ist |
| DE3720855C1 (en) | 1987-03-07 | 1988-02-25 | Hoesch Ag | Excavator tooth |
| US5224282A (en) | 1992-01-21 | 1993-07-06 | Harnischfeger Corporation | Tooth assembly for a digger bucket |
| AU690539B2 (en) | 1993-02-02 | 1998-04-30 | Esco Corporation | Excavating tooth |
| US6019434A (en) * | 1997-10-07 | 2000-02-01 | Fansteel Inc. | Point attack bit |
| EP1522636A1 (de) * | 2003-10-09 | 2005-04-13 | Jan De Nul N.V. | Roboter zum Zahnaustausch am Baggerkopf eines Schwimmbaggers |
| AU2006284527B2 (en) * | 2005-08-24 | 2010-01-07 | James A Calderwood | An improved ripper boot |
| CN101790621A (zh) * | 2007-07-02 | 2010-07-28 | 悉尼大学 | 切削尖头及工具 |
| CN101457644A (zh) * | 2007-12-11 | 2009-06-17 | 佳木斯大学 | 一种双金属截齿的生产工艺方法 |
| CA2636939A1 (en) * | 2008-07-07 | 2010-01-07 | James A. Calderwood | A surface engaging tool including high tensile inserts |
| CN202450568U (zh) | 2012-02-27 | 2012-09-26 | 江西耀升工贸发展有限公司 | 一种新型硬质合金挖掘机斗齿 |
-
2018
- 2018-03-28 DE DE102018204775.8A patent/DE102018204775A1/de active Pending
-
2019
- 2019-03-26 RS RS20250502A patent/RS66822B1/sr unknown
- 2019-03-26 EP EP19713780.5A patent/EP3775408B1/de active Active
- 2019-03-26 WO PCT/EP2019/057512 patent/WO2019185587A1/de not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| WO2019185587A1 (de) | 2019-10-03 |
| DE102018204775A1 (de) | 2019-10-02 |
| EP3775408B1 (de) | 2025-03-12 |
| RS66822B1 (sr) | 2025-06-30 |
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