CA2072119A1 - Traction tooth for cutting wheels - Google Patents
Traction tooth for cutting wheelsInfo
- Publication number
- CA2072119A1 CA2072119A1 CA002072119A CA2072119A CA2072119A1 CA 2072119 A1 CA2072119 A1 CA 2072119A1 CA 002072119 A CA002072119 A CA 002072119A CA 2072119 A CA2072119 A CA 2072119A CA 2072119 A1 CA2072119 A1 CA 2072119A1
- Authority
- CA
- Canada
- Prior art keywords
- scarifier
- bucket
- cutting
- combination
- accordance
- 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.)
- Abandoned
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
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)
- Shovels (AREA)
Abstract
The proposal is for a traction tooth (6) for cutting wheels, like blade wheels, underwater cutting wheels or the like, pivotably arranged in the region of several blades fitted at the periphery of the cutting wheel. The displacement (13) of each traction tooth takes place unilaterally and without any other guide and holding components directly at the back of the appropriate blade. The pivoting axis (8) of the traction tooth can be adjusted in the direction of the resultant cutting speed of the wheel. The traction tooth is in one piece and has a right-angled to acute-angled cross-sectional shape.
Description
ff~
Scarifier/Cutting Wheel Combination The inven~ion involves a combination cutting wheel, such as those used for bucket wheels, underwater cutting wheels, or similar mechanisms, and scarifier, wherebythe outer circumference of the cutting wheel is equipped with several buckets, which are fitted with cutting teeth near the ma~erial gathering area, and the scarifier is to be instalted on several buckets, such that one side of the scarifier is directly attached to the rear of the corresponding bucket, particularly in the area of the cutting teeth.
A bucket with a crushing mechanism, ~articularly for bucket wheel excavators, isknown from DE-OS 38 34 7~7. In each instance, the crushing rnechanism is hinged to the bucket, whereby the crushing mechanism is connected to a support that is attached to a carrying arm in such a way that it can swivel. One end of the carrier arm is attached directly to the bucket, whereas the other end is connected to the bucket with two connectors. The carrying arm consists of a section with cross pieces that have holes for connecting bolts, and of a clamp at the end of the section protruding outwards. The support is formed by two flat sections connected by transverse spars.
The disadvantages associated with ~he known technology lie in the fact that a complicated support must be created for the crushing mechanism, whereby the crushing mechanism is not directly connected to the bucket. This type of construction requires a large expenditure of time and resources and carries the risk that damage to the support or the crushing mechar,ism could occur that might cause the crushing rnechanism to fail ,~rematurely because oF the ~ever arms between the rear of the bucket and the crushing mechanism and the related forcesacting on the rear of the bucket.
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Scarifier/Cutting Wheel Combination The inven~ion involves a combination cutting wheel, such as those used for bucket wheels, underwater cutting wheels, or similar mechanisms, and scarifier, wherebythe outer circumference of the cutting wheel is equipped with several buckets, which are fitted with cutting teeth near the ma~erial gathering area, and the scarifier is to be instalted on several buckets, such that one side of the scarifier is directly attached to the rear of the corresponding bucket, particularly in the area of the cutting teeth.
A bucket with a crushing mechanism, ~articularly for bucket wheel excavators, isknown from DE-OS 38 34 7~7. In each instance, the crushing rnechanism is hinged to the bucket, whereby the crushing mechanism is connected to a support that is attached to a carrying arm in such a way that it can swivel. One end of the carrier arm is attached directly to the bucket, whereas the other end is connected to the bucket with two connectors. The carrying arm consists of a section with cross pieces that have holes for connecting bolts, and of a clamp at the end of the section protruding outwards. The support is formed by two flat sections connected by transverse spars.
The disadvantages associated with ~he known technology lie in the fact that a complicated support must be created for the crushing mechanism, whereby the crushing mechanism is not directly connected to the bucket. This type of construction requires a large expenditure of time and resources and carries the risk that damage to the support or the crushing mechar,ism could occur that might cause the crushing rnechanism to fail ,~rematurely because oF the ~ever arms between the rear of the bucket and the crushing mechanism and the related forcesacting on the rear of the bucket.
.. . .: ~............. ,, . :
.
2~; s~
A bucket wheel for a bucket wheei excavator is known from US-A 2,979,8~8. ~he outer circumference is fitted with several buckets, which are fit~ed with cutting teeth in the material ga-thering area. Additional teeth (sGarifiers) are fitted between each cutting tooth; one of the ends of the scarifiers is held by control elements and is fixed to the rear of the bucket. One of the disadvantages of this design is that the protruding teeth are subject to a relatively high component force due to therotating motion of the bucket wheel; because the teeth cannot move, their service life is relatively short.
It is an object of this invention to deveiop the known technology starting from U~
A 2,979,83~ such that the scarifier can move and to make it possible to chip offsmall pieces of extremely hard and brittle material at low cost, whereby it should be possible to manufacture the scarifier on a large scale using very few manufacturing ~echnology resources.
This object will be met by this invention in that 1he scarifier is rotatably mounted on an axis of rotation, whereby each scarifier is mounted to an attachment whichprotrudes through a corresponding hole in the rear of the bucket, and whereby the free end can be locked to the corresponding bucket.
Further advantages of the present invention are described in the claims. The invention is not only suitable for use on bucket wheels in open pit mining, but rather, it offers the possibility of using it, for examplé, in underwater brown coal/lignite extraction, fitted on an unde.water cutting wheel specially constructed for that purpose.
As opposed to the known technolo0y, the characteristics of the invention make itpossible to move the swivel feature of the scarifier directly to the rear of the .
, . ~ ' .
.. , :, . .
. . , . . :
~.
- : . . ..
- .
.
, . , . . . .
.
A bucket wheel for a bucket wheei excavator is known from US-A 2,979,8~8. ~he outer circumference is fitted with several buckets, which are fit~ed with cutting teeth in the material ga-thering area. Additional teeth (sGarifiers) are fitted between each cutting tooth; one of the ends of the scarifiers is held by control elements and is fixed to the rear of the bucket. One of the disadvantages of this design is that the protruding teeth are subject to a relatively high component force due to therotating motion of the bucket wheel; because the teeth cannot move, their service life is relatively short.
It is an object of this invention to deveiop the known technology starting from U~
A 2,979,83~ such that the scarifier can move and to make it possible to chip offsmall pieces of extremely hard and brittle material at low cost, whereby it should be possible to manufacture the scarifier on a large scale using very few manufacturing ~echnology resources.
This object will be met by this invention in that 1he scarifier is rotatably mounted on an axis of rotation, whereby each scarifier is mounted to an attachment whichprotrudes through a corresponding hole in the rear of the bucket, and whereby the free end can be locked to the corresponding bucket.
Further advantages of the present invention are described in the claims. The invention is not only suitable for use on bucket wheels in open pit mining, but rather, it offers the possibility of using it, for examplé, in underwater brown coal/lignite extraction, fitted on an unde.water cutting wheel specially constructed for that purpose.
As opposed to the known technolo0y, the characteristics of the invention make itpossible to move the swivel feature of the scarifier directly to the rear of the .
, . ~ ' .
.. , :, . .
. . , . . :
~.
- : . . ..
- .
.
, . , . . . .
.
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bucket, thereby avoiding the need for other connecting elements on the rear of the bucket. These measures make it possible to chip off small pieces of very hard and brittle material at low cost, without the wear of the teeth caused by external effects and variations in the di~ging mechanism, as is the case with the conventional excavator teeth.
The advantages of the present invention are essentially that the scarifier immediately and automatically adjusts to any resulting cutting speed, assuming that the tooth position is always optimum. The continuousiy changing tooth position results in the most economical tooth wear at optimum cutting load and minimum power consumption.
Because of its actual location on the rear of the bucket, the scarifier that is the object oF this invention, makes a first cut for the next depth of cut and therefore makes it easier for the bucket teeth the loosen this layer and fill the buckets.Because of the optimum arrangement of the cutting wheel or the buckets, very fine material is obtained, which can be easily transferred to a conveyor belt and requires no further intermediate crushing.
The scarifier is preferably mounted to the rear o'. the bucket such that the necessarily occurring lip wear on each bucket can be largely avoided; this is due to the tilted pvsition of the bucket wheel (open pit mining equipment). For this reason, the scarifier is eccentrically positioned on the rear of the respective bucket.
The actual position, however, depends on the material to be chipped off. The scarifier can be manufactured as a single casting, thereby making it possible toconstruct a relatively inexpensive alternative to the known technology in similar production runs. Preferred uses in open pit mining include the chipping of hard and brittle materials, such as limestone.
: . . - . . . - . , , ;,. . . :
.. . . . ~ . . . , -.
.' . . '- ' , , ' . ' ' ' .
' ' . '' ", ;. . ' , ' _ ~ _ An embodiment of the invention is illus~rated in the drawing and is described below. The figures show the following:
Figure 1 - Diagrarnmatic sketch of a buc!cet wheel for open pit mining with hinged buckets and scarifiers Figure 2 - Partial view of a bucket in accordance with Figure 1, with an enlarged view of the scarifier that is the object of this invention Figure 3 - Top view of Figure 2 Figure 1 is a schematic illustration of a bucket wheel 1 which can be used for open pit mining, specifically for the loosening and loading of rock containing limestone and quartz. Each of the buckets 2 has an opening 3 to load materials; it has been fitted with cutting teeth 4, which have been outlined. The rear 5 of each bucket ~
has been fitted with a hinged scarifier 5, which is located near the cutting teeth 4;
the cutting edge 7 of the scarifier is pos.tioned such that its cutting radius is greater than that of the cutting teeth 4. The axis of rotation 8 of each scarifier 6 runs in the direction of the resulting cutting speed of the bucket 1. The corresponding scarifier 6 is attached to the rear of the bucket 5 in area 9 below the cutting teeth 4 without further support or control elements.
Figures 2 and 3 provide an enlarged view of one of the buckets 2 from the side (Figure 2) and from above (Figure 3). The cutting teeth 4 and the scarifier 6 can be seen in the drawing. The gathering area for the cutting teeth 4 has an extension 10 towards the rear of the bucket 5 and serves as a support for the area 11 around the scarifier 6. As can be seen From Figure 3, the scarifier 6 ispositioned 13 eccentrically to the bucket 12 (longitudinal axis 12) on the rear of . ~ ' '' .
2~
the bucket 5. A hole 15 has been drilled in the area of the cutting teeth 4 which extends into the inside of the bucket, and into which a fitted attachment 14 (boits, shaft butts or the like) can be inserted so that ;t protrudes into the support area 11 of the scarifier. The attachment 14 is mounted to the inside of the bucket with a disk 16 that is welded on so that movement in the direction of the axis of rotation 8 is insignificant and whereby a pivoting movement can be produced around the axis of rotation 8. The section of the scarifier 6 is thicker in the attachment area 13, and it narrows towards the cutting edge 7; the cross-sectionof the scarifier 6 thus changes from an approxirnately right angle to an acute angle. Because of the extent of freedom of movement, the corresponding scarifier 6 is able to adjust automatically, to any circumferential and swivel speed, thereby achieving optimum tooth position with respect to the material to be chipped off. Because of its special eccentric position in relation to the longitudinal axis 12 on the rear of the bucket 5, each scarifier 6 cuts into the next depth of cut, thereby making it easier for the cutting teeth 4 to loosen the previously started layer and load the buckets 2. The attaching elements 17 for the series of teeth 18 (only outlined here) making up the rear of the buckets 5 are fitted onto the corresponding extension 10.
- ..-.
bucket, thereby avoiding the need for other connecting elements on the rear of the bucket. These measures make it possible to chip off small pieces of very hard and brittle material at low cost, without the wear of the teeth caused by external effects and variations in the di~ging mechanism, as is the case with the conventional excavator teeth.
The advantages of the present invention are essentially that the scarifier immediately and automatically adjusts to any resulting cutting speed, assuming that the tooth position is always optimum. The continuousiy changing tooth position results in the most economical tooth wear at optimum cutting load and minimum power consumption.
Because of its actual location on the rear of the bucket, the scarifier that is the object oF this invention, makes a first cut for the next depth of cut and therefore makes it easier for the bucket teeth the loosen this layer and fill the buckets.Because of the optimum arrangement of the cutting wheel or the buckets, very fine material is obtained, which can be easily transferred to a conveyor belt and requires no further intermediate crushing.
The scarifier is preferably mounted to the rear o'. the bucket such that the necessarily occurring lip wear on each bucket can be largely avoided; this is due to the tilted pvsition of the bucket wheel (open pit mining equipment). For this reason, the scarifier is eccentrically positioned on the rear of the respective bucket.
The actual position, however, depends on the material to be chipped off. The scarifier can be manufactured as a single casting, thereby making it possible toconstruct a relatively inexpensive alternative to the known technology in similar production runs. Preferred uses in open pit mining include the chipping of hard and brittle materials, such as limestone.
: . . - . . . - . , , ;,. . . :
.. . . . ~ . . . , -.
.' . . '- ' , , ' . ' ' ' .
' ' . '' ", ;. . ' , ' _ ~ _ An embodiment of the invention is illus~rated in the drawing and is described below. The figures show the following:
Figure 1 - Diagrarnmatic sketch of a buc!cet wheel for open pit mining with hinged buckets and scarifiers Figure 2 - Partial view of a bucket in accordance with Figure 1, with an enlarged view of the scarifier that is the object of this invention Figure 3 - Top view of Figure 2 Figure 1 is a schematic illustration of a bucket wheel 1 which can be used for open pit mining, specifically for the loosening and loading of rock containing limestone and quartz. Each of the buckets 2 has an opening 3 to load materials; it has been fitted with cutting teeth 4, which have been outlined. The rear 5 of each bucket ~
has been fitted with a hinged scarifier 5, which is located near the cutting teeth 4;
the cutting edge 7 of the scarifier is pos.tioned such that its cutting radius is greater than that of the cutting teeth 4. The axis of rotation 8 of each scarifier 6 runs in the direction of the resulting cutting speed of the bucket 1. The corresponding scarifier 6 is attached to the rear of the bucket 5 in area 9 below the cutting teeth 4 without further support or control elements.
Figures 2 and 3 provide an enlarged view of one of the buckets 2 from the side (Figure 2) and from above (Figure 3). The cutting teeth 4 and the scarifier 6 can be seen in the drawing. The gathering area for the cutting teeth 4 has an extension 10 towards the rear of the bucket 5 and serves as a support for the area 11 around the scarifier 6. As can be seen From Figure 3, the scarifier 6 ispositioned 13 eccentrically to the bucket 12 (longitudinal axis 12) on the rear of . ~ ' '' .
2~
the bucket 5. A hole 15 has been drilled in the area of the cutting teeth 4 which extends into the inside of the bucket, and into which a fitted attachment 14 (boits, shaft butts or the like) can be inserted so that ;t protrudes into the support area 11 of the scarifier. The attachment 14 is mounted to the inside of the bucket with a disk 16 that is welded on so that movement in the direction of the axis of rotation 8 is insignificant and whereby a pivoting movement can be produced around the axis of rotation 8. The section of the scarifier 6 is thicker in the attachment area 13, and it narrows towards the cutting edge 7; the cross-sectionof the scarifier 6 thus changes from an approxirnately right angle to an acute angle. Because of the extent of freedom of movement, the corresponding scarifier 6 is able to adjust automatically, to any circumferential and swivel speed, thereby achieving optimum tooth position with respect to the material to be chipped off. Because of its special eccentric position in relation to the longitudinal axis 12 on the rear of the bucket 5, each scarifier 6 cuts into the next depth of cut, thereby making it easier for the cutting teeth 4 to loosen the previously started layer and load the buckets 2. The attaching elements 17 for the series of teeth 18 (only outlined here) making up the rear of the buckets 5 are fitted onto the corresponding extension 10.
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Claims (7)
1. A combination cutting wheel (1), such as those used for bucket wheels, underwater cutting wheels or similar mechanisms, and scarifier (6), whereby the outer circumference of the cutting wheel (1) is equipped with several buckets (2), which are fitted with cutting teeth (4) near the material gathering area, and the scarifier (6) is to be installed on several buckets (2),such that one side of the scarifier (6) is directly attached to the rear of the corresponding bucket (5), particularly in the area of the cutting teeth (4), characterized by the fact that the scarifier (6) is rotatably mounted to an axis of rotation (8), whereby each scarifier (6) is mounted (13) to an attachment (14) which protrudes through a corresponding hole (15) in the rear of the bucket (5), and whereby the free end can be locked to the corresponding bucket (2).
2. A combination in accordance with claim 1, characterized by an extension (10) of the bucket's (2) material gathering device, which provides support to the corresponding scarifier (6).
3. A combination in accordance with claims 1 or 2, characterized by the fact that the scarifier (6) is mounted to the rear of the bucket (5), outside the longitudinal bucket axis (12).
4. A combination in accordance with claims 1 to 3, characterized by the fact that the scarifier (6), seen in a top view, is wider at the area where it is attached (13) than in the cutting area (7).
5. A combination in accordance with claims 1 to 4, characterized by the fact that the cutting edge (7) of the scarifier (6) is positioned at approximately a right angle to the cutting teeth (4) of the corresponding bucket (2).
6. A combination in accordance with claims 1 to 5, characterized by the fact that the attachment (14) is designed for the wider area of the scarifier (6).
7. A combination in accordance with claims 1 to 6, characterized by a disk (16) welded to the free end of the attachment (14) and the inside of the bucket at a predefined distance.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP3941123.0 | 1989-12-13 | ||
| DE3941123A DE3941123A1 (en) | 1989-12-13 | 1989-12-13 | TRIP TOOTH FOR CUTTING WHEELS |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2072119A1 true CA2072119A1 (en) | 1991-06-14 |
Family
ID=6395364
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002072119A Abandoned CA2072119A1 (en) | 1989-12-13 | 1990-08-09 | Traction tooth for cutting wheels |
Country Status (5)
| Country | Link |
|---|---|
| AU (1) | AU633615B2 (en) |
| CA (1) | CA2072119A1 (en) |
| DE (1) | DE3941123A1 (en) |
| WO (1) | WO1991009181A1 (en) |
| ZA (1) | ZA906798B (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2979838A (en) * | 1959-03-23 | 1961-04-18 | Cleveland Trencher Co | Excavating machine |
| US3280486A (en) * | 1964-10-19 | 1966-10-25 | Atlantic Richfield Co | Ripper tooth for bucket diggers and the like |
| DE7602533U1 (en) * | 1976-01-30 | 1976-06-16 | Pallari, Kyoesti, Tervola (Finnland) | EXCAVATOR SHOVEL WITH SOIL ICE WEDGE |
| PL158249B1 (en) * | 1987-10-12 | 1992-08-31 | Ripper-bucket in particular for a bucket-wheel excavator |
-
1989
- 1989-12-13 DE DE3941123A patent/DE3941123A1/en active Granted
-
1990
- 1990-08-09 WO PCT/EP1990/001306 patent/WO1991009181A1/en active Application Filing
- 1990-08-09 CA CA002072119A patent/CA2072119A1/en not_active Abandoned
- 1990-08-09 AU AU61495/90A patent/AU633615B2/en not_active Ceased
- 1990-08-27 ZA ZA906798A patent/ZA906798B/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| AU633615B2 (en) | 1993-02-04 |
| DE3941123A1 (en) | 1991-06-20 |
| ZA906798B (en) | 1991-06-26 |
| DE3941123C2 (en) | 1992-08-20 |
| WO1991009181A1 (en) | 1991-06-27 |
| AU6149590A (en) | 1991-07-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |