EP0184209B1 - Montage pour dent d'excavatrice - Google Patents

Montage pour dent d'excavatrice Download PDF

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Publication number
EP0184209B1
EP0184209B1 EP85115478A EP85115478A EP0184209B1 EP 0184209 B1 EP0184209 B1 EP 0184209B1 EP 85115478 A EP85115478 A EP 85115478A EP 85115478 A EP85115478 A EP 85115478A EP 0184209 B1 EP0184209 B1 EP 0184209B1
Authority
EP
European Patent Office
Prior art keywords
tooth
teeth
bucket
digger
angles
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.)
Expired
Application number
EP85115478A
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German (de)
English (en)
Other versions
EP0184209A1 (fr
Inventor
Peter Alexander Lehnhoff
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.)
Lehnhoff Hartstahl GmbH and Co
Original Assignee
Lehnhoff Hartstahl GmbH and Co
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
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Application filed by Lehnhoff Hartstahl GmbH and Co filed Critical Lehnhoff Hartstahl GmbH and Co
Publication of EP0184209A1 publication Critical patent/EP0184209A1/fr
Application granted granted Critical
Publication of EP0184209B1 publication Critical patent/EP0184209B1/fr
Expired legal-status Critical Current

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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
    • E02F9/2858—Teeth characterised by shape

Definitions

  • the invention relates to an excavator tooth arrangement for bucket wheel buckets of a bucket wheel excavator with center, corner and side teeth which are arranged interchangeably in the bucket sockets and which have different angular positions with respect to the top edge of the bucket, each of which has a tooth wedge and a tooth shaft with an intermediate bead. wherein the inner walls of the sockets correspond to the outer surfaces of the tooth shaft.
  • Bucket wheel excavators are known to dig the mountains with the help of buckets, which are arranged on a rotating bucket wheel that runs along a circular arc, these buckets being equipped with excavator teeth adapted to the cutting process in their arrangement and design when used in heavy mountains and when dredging along their upper edges must be so that the paddle wheel can always be "cut free”. Accordingly, the central teeth, canines and posterior teeth are designed differently in their tooth shape and in their dimensions; see. "The bucket wheel excavator as a mining device", 1st ed., 1973, TRANS. TECH. PUBLICATIONS, page 121.
  • the invention has for its object to further develop the known excavator tooth arrangement for the buckets of a bucket wheel excavator with respect to the excavator teeth arranged on the edge of the bucket and the arrangement thereof, and the excavator teeth required for this, in such a way that digging in heavy mountains and wet excavators better than hitherto with longer service lives and shorter assembly and maintenance times can be carried out.
  • sockets welded to the outer walls of the bucket (1) are designed as mutually independent sleeves (H 1 to Hg) that the central axes (M) for the one or more, the bucket (1) centrally or in the central teeth (B 5 ), which are at equal distances from perpendicularly intersecting planes, are perpendicular to the top edge of the bucket,
  • the central axis (M) for the canines (8 4 , B 6 ) arranged in the plane containing the chest wall (4) of the bucket (1) include the same but oppositely directed inclination angles ( ⁇ 4/6 ) with the top edge of the bucket,
  • the central axes (M) for the side teeth (B 1 to B 3 , B 7 to B s ) arranged in the plane enclosing the side walls (2, 3) of the bucket (1) with the upper edge (K) of the bucket (1) include rectified but different inclination angles ( ⁇ 1-3 and 11 7 - 9 ,
  • the sizes of the inclination angles (q 4 and ⁇ 6 ) for the excavator teeth (B 4 , B 6 ) serving as canines are 10 ° to 20 °, preferably 15 °,
  • the inclination angles ( ⁇ 1-3 and ⁇ 7-9 ) for the excavator teeth serving as posterior teeth (B 1 to B 3 , B 7 to Bg) increase by 5 ° in each case within a range of 5 ° to 20 °, preferably at 5 °, 10 ° and 15 °,
  • the central, canine and posterior teeth are one-piece excavator teeth, each with a tooth wedge and a tooth shaft having a flat contact surface, between which a bead serving as a stop is arranged, the tooth wedge underside being based on the contact surface of the tooth shaft has an increase of 1 ° to 3 °, preferably of 2 °, the top of the cog wedge, based on the contact surface, has a reduction of 20 ° to 25 °, preferably of 23 °, and the wedge angle of the cog wedge 19 ° to 22 °, preferably 21 °.
  • the tooth shaft is formed as an irregular hexagon-shaped truncated pyramid with two flat, mutually opposing surfaces, one of which forms the contact surface perpendicular to the base of the truncated pyramid, and the other surfaces of the truncated pyramid, which are opposite each other in pairs Angle of about 168 " include, wherein the tooth wedge in the area below the wedge tip in cross-section is approximately double-T-shaped such that the recesses between the legs of the double-T are on the tooth wedge top and the tooth wedge bottom.
  • the contact surface of the excavator tooth has a fastening cam which is encompassed by a securing tab which projects with a screw bolt through the end of the sleeve facing away from the excavator tooth and carries a cap there, which is opposite the facing sleeve end by means of a screw is tense.
  • the toothed wedge of the excavator tooth according to the invention is advantageous to design as a pointed tooth which is cross-shaped in cross section.
  • an excavator tooth arrangement is possible which uses the same excavator teeth for the central teeth, canine teeth and posterior teeth, the different cutting tasks due to the different angular position of the excavator teeth with respect to the upper edge of the bucket and the Inclination of the sleeves receiving the excavator teeth is taken into account. Since a conventional bucket wheel excavator has about fifteen buckets, each with nine digging teeth, it can be seen immediately that the use of identically designed digging teeth can achieve a significant simplification in manufacture, assembly and maintenance. Since the sleeves supporting the excavator teeth are firmly welded to the bucket, confusion when exchanging worn excavator teeth can no longer occur.
  • the sleeves H are welded to the outer walls of the bucket in such a way that they each have different angles of inclination ⁇ 1 to ⁇ 9 (eta l to eta 9 ) with respect to the verticals S 1 to Sg . Accordingly, the excavator teeth B 1 to Bg to be inserted into the sleeves H 1 to H 9 have different angles of inclination ⁇ (eta). If, with reference to FIG.
  • the excavator teeth B 4 and B 6 assigned to the side walls 2 and 3 are referred to as canine teeth and the excavator teeth B 5 as central tooth, then it applies that the central axes M of the one or more, the bucket 1 centrically or arranged at equal intervals perpendicularly intersecting planes, central teeth B 5 are perpendicular to the upper edge of the bucket, that the central axis M of the canine teeth B 4 and B 6 arranged in the plane containing the chest wall 4 of the bucket 1 with the upper edge of the bucket have inclination angles of equal size but in opposite directions 114 and ⁇ 6 (eta 4 and etas), and that the central axes M of the side teeth B 1 to B 3 and B 7 to Bg arranged in the plane including the side walls 2 and 3 of the bucket 1 with the Include upper edge K of bucket 1 in the same direction but different angles of inclination ⁇ 1 to ⁇ 3 and ⁇ 7 to ⁇ 9 (eta 1 to eta 3 and eta
  • the angles of inclination ⁇ 4 and ⁇ 6 (eta 4 and eta 6 ) of the canines B 4 and B 6 are 10 ° to 20 °, but preferably 15 °, while the angles of inclination ⁇ 1 to ⁇ 3 (eta l bis eta 3 ) and ⁇ 9 to ⁇ 7 (etag to eta 7 ) of the posterior teeth B 1 to B 3 and B 9 to B 7 from the inside, that is to say from the paddle wheel (not shown), i.e., starting from the left in relation to FIG increase towards the chest wall by 5 ° in each case within a range of 5 ° to 20 °, so that the central axes M preferably have an inclination of 5 °, 10 ° and 15 ° with respect to the verticals S 1 to S 3 .
  • the side walls and chest walls 2 to 4 of the bucket 1 have contact surfaces.
  • the excavator tooth B which is of identical design regardless of its use as a posterior tooth, canine tooth or central tooth, will now be described with reference to FIGS.
  • the one-piece, preferably drop-forged excavator tooth has a toothed wedge 10 and a toothed shaft 11, between which there is a broad bulge 12 which, as soon as the excavator tooth is inserted into the associated sleeve H, forms a cover for the sleeve.
  • the tooth shaft is a cross section of an irregular hexagon truncated pyramid with two flat, opposing surfaces 14, 15, one of which 14 forms the contact surface 14 perpendicular to the base 36 of the truncated pyramid, and the other, each in pairs opposite one another
  • Surfaces 16, 17 and 18, 19 of the truncated pyramid form an angle k of approximately 168 °.
  • the surface 15 has an inclination angle ⁇ (delta) of 10 ° to 14 °, in particular of 12 0 at.
  • the pyramid-shaped tooth wedge 10 has a tooth wedge underside 20 and a tooth wedge top 21; see. In particular, FIG. 5.
  • the tooth wedge underside 20 has an elevation a (sigma) of 1 ° to 3 °, preferably of 2 °, with respect to the contact surface 14 of the excavator tooth, while the tooth wedge top 21, with respect to this contact surface 14, has a lowering ⁇ (tau) from 20 ° to 25 °, preferably from 23 °.
  • the tooth wedge surfaces, which are essentially rectangular, are slightly concave, as shown in FIG. 4 in particular.
  • the wedge angle ⁇ (beta) of the tooth wedge 10 is 19 ° to 22 °, preferably 21 °.
  • toothed wedge 10 in the area below its wedge tip 24 is approximately double T-shaped in cross-section (see FIG. 7) so that there are recesses 26 and 27 on the toothed wedge top and the toothed wedge underside 21 and 20, which are so-called self-sharpening surfaces.
  • the contact surface 14 of the excavator tooth B located on the toothed shaft 11 has a cam 30 located in the lower region, which is encompassed by a securing tab 31 which projects with a screw bolt 32 through the end of the sleeve H facing away from the excavator tooth B and there a cap 34 carries, which can be braced against the facing sleeve end 37 by means of a nut 35 (cf. FIGS. 1 and 8).
  • the excavator tooth B inserted into the sleeve H can thus be fixed in a simple manner, as is also shown in FIGS. 1 and 3, the tensioning elements lying approximately in the central axis M.
  • each excavator tooth B 4 to B 6 has an angle of attack a (alpha ) in the range from 30 ° to 50 °, preferably from 43 °, and a clearance angle y (gamma) in a range from 20 ° to 28 °, preferably from 23 °, while the excavator teeth detachably connected to the side wall 2, 3 B 1 to B 3 and B 7 and Bg have an angle of attack a (alpha) in the range from 30 ° to 50 °, preferably 48 °, and a clearance angle y (gamma) in a range from 20 ° to 28 °, preferably 18 ° , have (see FIG. 1).
  • the bucket, and thus the bucket wheel is perfectly “cleared" when the machine is standing for a long time, even in
  • FIG. 9 shows the construction of the excavator tooth B described above as a pointed tooth. Accordingly, with otherwise the same design, in particular the tooth shaft 11 and the bead 12, the toothed wedge 10 is designed as a known pointed wedge, which ends in a point 24 'instead of the cutting edge 24.

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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)
  • Earth Drilling (AREA)

Claims (9)

1. Disposition de dents d'excavatrice pour un godet du tambour à godets d'une excavatrice, comprenant des dents centrales, d'encoignure et latérales (B1 à Bg), présentant des positions angulaires différentes par rapport au bord supérieur du godet (1) et disposées de façon interchangeable dans des montures (H1 à Hg) du godet (1), lesdites dents comportant chacune une partie formant coin (10) et une partie formant hampe (11), avec un renflement (12) entre lesdites parties, les parois intérieures (5, 6, 7) des montures (H1 à Hg) correspondant aux parois extérieures (15 à 19) des parties de dents (11) formant hampe, ladite disposition étant caractérisé en ce que
les dents centrales, d'encoignure et latérales (B1 à B9) ont les mêmes formes et dimensions;
en ce que les montures soudées aux parois extérieures de godet (1) sont constituées sous forme de fourreaux (H1 à Hg) indépendants les uns des autres de telle manière que les axes médians (M) de la dent centrale ou des dents centrales (B5) disposés dans un ou plusieurs plans coupant perpendiculairement le godet (1) au centre ou à des distances d'écartement égales, sont perpendiculaires au bord supérieur du godet;
en ce que les axes médians (M) des dents de coin (B4, B6), disposés dans le plan contenant la paroi de face (4) du godet (1), font avec le bord supérieur du godet des angles d'inclinaison de même grandeur, mais de sens opposé;
en ce que les axes médians (M) des dents latérales (B1 à B3, 87 à Bg) disposés dans le plan incluant les parois latérales (2, 3) du godet (1) font avec le bord supérieur (K) des angles d'inclinaison (η1-3 et η7-9) dirigés de même, mais de grandeur différente;
en ce que les grandeurs des angles d'inclinaison (η4/6) des dents d'excavatrice (B4, B6) servant de dents de coin sont de 10 à 20°, ou de préférence de 15° ;
en ce que les angles d'inclinaison (η1-3 et η7-9) des dents d'excavatrice servant de dents latérales (B1 à B3, B7 à B9) se trouvant, chaque fois en augmentnt de 5°, à l'intérieur d'un intervalle allant de 5° à 20°, et sont de préférence de 5°, 10° et 15°;
en ce qu'il est attribué, aux dents d'excavatrice (B4 à B6) reliées de façon détachable à la paroi de face (4) du godet (1), des angles d'attaque (a) dans l'intervalle de 30° à 50° ou de préférence de 43°, et un angle d'incidence libre (y) dans l'intervalle de 20 à 28° et de préférence de 23° ;
en ce qu'il est attribué, aux dents d'excavatrice (B1 à B3 et B7 à B9), reliées de façon détachable à la paroi latérale (2, 3), des angles d'attaque (a) dans l'intervalle de 30 à 50°, ou de préférence de 48°, et des angles d'incidence libre (y) dans un intervalle de 20 à 28°, ou de préférence de 18°.
2. Disposition de dents d'excavatrice selon la revendication 1, caractérisée en ce que les dents centrales, d'encoignure et latérales (B1 à B9) sont des dents d'excavatrice d'une seule pièce comprenant chacune une partie formant coin (10) et une partie formant hampe (11) qui comporte une surface d'assise plane, avec un renflement (12) servant d'arrêt entre lesdites parties, le côté inférieur (20) de la partie formant coin présentant, par rapport à la surface d'arrêt (14) de la partie de dent (11) formant hampe, une surélévation σ (= sigma) de 1 à 3°, ou de préférence de 2°;
en ce que le côté supérieur de la partie de dent (21) formant coin présente, par rapport à la surface d'arrêt (14), un renforcement τ (= tau) de 20 à 25° ou de préférence de 23° ;
et en ce que l'angle de coin β(= beta) de la partie de dent (10) formant coin est de 19 à 22°, ou de préférence de 21°.
3. Disposition de dents d'excavatrice selon la revendication 2, caractérisée en ce que la partie de dent (11) formant hampe est constituée comme un tronc de pyramide formant, en section transversale, un hexagone irrégulier, avec deux surfaces planes (14, 16) mutuellement opposées, dont l'une (14) forme la surface d'assise perpendiculaire à la base (36) du tronc de pyramide, et dont les autres surface (16, 17 et 18, 19) du tronc de pyramide, chacune mutuellement en regard par paires, dont entre elles un angle (k) de 168° environ.
4. Disposition de dents d'excavatrice selon les revendications 2 et 3, caractérisée en ce que le renflement (12) se trouvant entre la partie de dent (10) formant coin et la partie de dent (11) formant hampe constitue une couverture pour le fourreau (4).
5. Disposition de dents d'excavatrice selon les revendications 2 à 4, caractérisée en ce que la partie de dent (10) formant coin est conformée, dans la région située en dessous de la pointe (24) du coin, sensiblement en forme de double T en section transversale, de façon qu'il y ait des évidements (26, 27) entre les branches du double T sur le côté supérieur de la forme en coin de la dent et de son côté inférieur (21, 20).
6. Disposition de dents d'excavatrice selon les revendications 2 à 5, caractérisée en ce que la surface d'assise (14) comporte un ergot (30) de fixation, enserré par un collier de sécurité, dont une tige filetée (32) dépasse de l'extrémité du fourreau (11) éloignée de la dent d'excavatrice (B) et porte à cet endroit une coiffe (34), laquelle peut se déformer au moyen d'un écrou (35) par rapport à l'extrémité proche (37) du fourreau.
7. Disposition de dents d'excavatrice selon les revendications 2 à 6, caractérisée en ce que la partie de dent (10) formant coin est constituée comme une dent pointue (24') en forme de croix en section transversale.
8. Disposition de dents d'excavatrice selon les revendications 2 à 7, caractérisée en ce que la surface (15), en regard de la surface d'assise plane (14) de la partie de dent (11) formant hampe, est inclinée sous un angle d'inclinaison δ (= delta) de 10 à 14°, ou de préférence de 12°, par rapport à ladite surface d'assise.
9. Disposition de dents d'excavatrice selon la revendication 1, caractérisée en ce que l'angle d'incidence libre y (= gamma) des dents d'excavatrice reliées au godet (1) du tambour à godets est de 2 à 48°, ou de préférence de 26°, et l'angle d'attaque a (= alpha), 20 à 28°, ou de préférence 23°.
EP85115478A 1984-12-06 1985-12-05 Montage pour dent d'excavatrice Expired EP0184209B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19843444563 DE3444563A1 (de) 1984-12-06 1984-12-06 Baggerzahn-anordnung
DE3444563 1984-12-06

Publications (2)

Publication Number Publication Date
EP0184209A1 EP0184209A1 (fr) 1986-06-11
EP0184209B1 true EP0184209B1 (fr) 1989-03-29

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ID=6252089

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EP85115478A Expired EP0184209B1 (fr) 1984-12-06 1985-12-05 Montage pour dent d'excavatrice

Country Status (10)

Country Link
US (1) US4642920A (fr)
EP (1) EP0184209B1 (fr)
JP (1) JPH0651983B2 (fr)
CN (1) CN1006405B (fr)
AU (1) AU582512B2 (fr)
BR (1) BR8506287A (fr)
CA (1) CA1248997A (fr)
DE (2) DE3444563A1 (fr)
ES (1) ES296768Y (fr)
ZA (1) ZA859332B (fr)

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Also Published As

Publication number Publication date
ES296768Y (es) 1988-10-01
ZA859332B (en) 1986-08-27
CN1006405B (zh) 1990-01-10
CA1248997A (fr) 1989-01-17
AU582512B2 (en) 1989-03-23
AU5079885A (en) 1986-06-12
ES296768U (es) 1988-01-16
EP0184209A1 (fr) 1986-06-11
CN85108788A (zh) 1986-06-10
DE3444563C2 (fr) 1993-09-16
DE3444563A1 (de) 1986-06-19
DE3569139D1 (en) 1989-05-03
JPS61137931A (ja) 1986-06-25
JPH0651983B2 (ja) 1994-07-06
BR8506287A (pt) 1986-08-26
US4642920A (en) 1987-02-17

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