GB2032492A – Cutter Head for Suction Dredger
– Google Patents
GB2032492A – Cutter Head for Suction Dredger
– Google Patents
Cutter Head for Suction Dredger
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Info
Publication number
GB2032492A
GB2032492A
GB7929046A
GB7929046A
GB2032492A
GB 2032492 A
GB2032492 A
GB 2032492A
GB 7929046 A
GB7929046 A
GB 7929046A
GB 7929046 A
GB7929046 A
GB 7929046A
GB 2032492 A
GB2032492 A
GB 2032492A
Authority
GB
United Kingdom
Prior art keywords
cutter
bits
web
cutter head
webs
Prior art date
1978-08-21
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
Application number
GB7929046A
Other versions
GB2032492B
(en
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.)
WESTMINSTER DREDGING
Original Assignee
WESTMINSTER DREDGING
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.)
1978-08-21
Filing date
1979-08-21
Publication date
1980-05-08
1978-08-21
Priority claimed from GB7833976A
external-priority
patent/GB2034369A/en
1979-08-21
Application filed by WESTMINSTER DREDGING
filed
Critical
WESTMINSTER DREDGING
1979-08-21
Priority to GB7929046A
priority
Critical
patent/GB2032492B/en
1980-05-08
Publication of GB2032492A
publication
Critical
patent/GB2032492A/en
1982-08-11
Application granted
granted
Critical
1982-08-11
Publication of GB2032492B
publication
Critical
patent/GB2032492B/en
Status
Expired
legal-status
Critical
Current
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Classifications
E—FIXED CONSTRUCTIONS
E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
E02F—DREDGING; SOIL-SHIFTING
E02F3/00—Dredgers; Soil-shifting machines
E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
E02F3/88—Dredgers; Soil-shifting machines mechanically-driven with arrangements acting by a sucking or forcing effect, e.g. suction dredgers
E02F3/90—Component parts, e.g. arrangement or adaptation of pumps
E02F3/92—Digging elements, e.g. suction heads
E02F3/9293—Component parts of suction heads, e.g. edges, strainers for preventing the entry of stones or the like
E—FIXED CONSTRUCTIONS
E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
E02F—DREDGING; SOIL-SHIFTING
E02F3/00—Dredgers; Soil-shifting machines
E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
E02F3/88—Dredgers; Soil-shifting machines mechanically-driven with arrangements acting by a sucking or forcing effect, e.g. suction dredgers
E02F3/90—Component parts, e.g. arrangement or adaptation of pumps
E02F3/92—Digging elements, e.g. suction heads
E02F3/9212—Mechanical digging means, e.g. suction wheels, i.e. wheel with a suction inlet attached behind the wheel
E02F3/9225—Mechanical digging means, e.g. suction wheels, i.e. wheel with a suction inlet attached behind the wheel with rotating cutting 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
E02F9/2866—Small metalwork for digging elements, e.g. teeth scraper bits for rotating digging elements
Abstract
A cutter head for a suction dredger which includes a central boss (11) mountable upon a power drive shaft (12) and suction head of the dredger, wherein the boss (11) carries at least one spiral-helical web (13) upon which is mounted an array of cutter bits (19) spaced at intervals along the web (13) and projecting therefrom so that their tips define a generally part-ellipsoidal envelope (15), the working direction of the bits (19) and the «hand» of the spiral-helix of the web (13) being such that in use the cuts made by successive bits (19) on the same web (13) are staggered relatively to one another, each succeeding cut being nearer to the larger diameter end of the cutter head.
Description
SPECIFICATION
Cutter Head for a Suction Dredger
This invention relates to cutter heads for floating suction dredgers. A conventional cutter head consists of a set of curved spiral-helical blades mounted on an axial boss for rotation under power for the purpose of breaking up the sea or river bed, the broken fragments being removed from the head by suction and delivered to the dredger for disposal.
When the sea bed consists of soft clay or sand, a typical dredger can operate at what is considered a satisfactory output rate, but when harder conglomerates, or rock are encountered, then the rate of removai decreases very significantly. For example, with a hard rock, having a compressive strength of 2000-3000 Ib/sq.in. the rate may be reduced by as much as 90%, though it would still be generally regarded as an acceptable rate of working. For harder rocks the rate is even lower until one reaches rock compressive strengths approaching 7,000 Ibs/sq.
in., when other methods, such as blasting, must be adopted, which significantly increases the time and cost of the whole operation.
Attempts have been made to adopt dry rock cutting techniques, for example by fitting teeth or picks to the cutter blades, but these have not been particularly successful due in part to a lack of understanding of the physical properties of underwater rock formations.
It is an object of the present invention to provide an improved cutter head for a suction dredger which is capable of operating on harder rocks than at present possible, or which can achieve a higher rate of removal than can be obtained at present for a given rock strength.
The present invention consists in a cutter head for a suction dredger which includes a central boss mountable upon a power drive shaft and suction head of the dredger, wherein the boss carries at least one spiral-helical web upon which is mounted an array of cutter bits spaced at intervals along the web and projecting therefrom so that their tips define a generally part-ellipsoidal envelope, the working direction of the bits and the «hand» of the spiral-helix of the web being such that in use the cuts made by successive bits on the same web are staggered relatively to one another each succeeding cut being nearer to the larger diameter end of the cutter head.
In the accompanying drawings:
Figure 1 is a side view of one form of cutter head according to the present invention,
Figure 2 is a longitudinal section through the cutter head on Figure 1, and
Figure 3 is a cross section taken in a spiral plane starting at line 3-3 of Figure 1.
In carrying the invention into effect according to one convenient mode by way of example, a cutter head for a suction dredger includes a central boss 11 adapted to be fitted on the drive shaft 12 of suction head of known form of a suction dredger.
Welded to the central boss are four interposed closely-spaced pairs of spiral-helical webs 1 3 of metal sheet or plate material thus forming a fourstart spiral-heiical channel system, between adjacent pairs of web pairs, each channel being of about 1 turns. At the larger diameter end the webs 13 are joined to a pair of annular rings 14 positioned coaxially with the axis of the boss 11 and at right angles thereto.
At the smaller diameter end the webs 13 are joined to a pair of conical rings 23 positioned coaxially with the axis of the boss, and whose included angle is about 600.
The webs 1 3 are so dimensioned that in longitudinal profile they define a curve 1 5 which is part of a near ellipse and is chosen so as to present the optimum angle of attack to the sea bed whatever the angle of the axis of the cutter to the horizontal in use.
The peripheries of the webs and the annular rings are provided with cut-outs 1 6 in which are welded mounting plates 1 7 each of which bridges the pair of webs or rings and upon which is mounted a block 1 8 holding a cutter bit 1 9 so that an array of cutter bits 19 is formed.
The cut-outs are so dimensioned that the tips of the cutter bits 1 9 project beyond the peripheries of the webs, the extent to which they project defining the maximum cutting depth of the bits, and the bits are angled in conventional manner as shown in Figure 3 so as to have a working direction (clockwise in figure 3). The tips of the cutter bits thus define a generally partellipsoidal envelope of the same form as curve 1 5.
The cutter bits 1 9 are spaced at intervals around the pairs of webs 1 3 and the working direction of the bits 19 and the «hand» of the spiral-helix of the webs are such that in use the cuts made by successive bits on the same web are staggered relatively to one another each succeeding cut being nearer to the larger diameter end of the cutter head.
The pairs of webs 13 are provided with apertures 20 to prevent «bridging» of material between adjacent pairs, and to allow the rearward flow of material to the mouth 21 of the suction head under the action of the suction from the head assisted by the helical form of the webs 1 3.
To assist this action scoops 22 are provided between adjacent pairs of scoops 22, but other arrangements may be advantageous.
Various modifications may be made within the scope of the present invention. For example, the cutter bits may be replaced by other forms of mining tools such as picks or chisels.
Claims
1. A cutter head for a suction dredger which includes a central boss mountable upon a power drive shaft and suction head of the dredger, wherein the boss carries at least one spiral-helical web upon which is mounted an array of cutter bits spaced at intervals along the web and projecting therefrom so that their tips define a generally part-ellipsoidal envelope, the working direction of
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (6)
**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Cutter Head for a Suction Dredger This invention relates to cutter heads for floating suction dredgers. A conventional cutter head consists of a set of curved spiral-helical blades mounted on an axial boss for rotation under power for the purpose of breaking up the sea or river bed, the broken fragments being removed from the head by suction and delivered to the dredger for disposal. When the sea bed consists of soft clay or sand, a typical dredger can operate at what is considered a satisfactory output rate, but when harder conglomerates, or rock are encountered, then the rate of removai decreases very significantly. For example, with a hard rock, having a compressive strength of 2000-3000 Ib/sq.in. the rate may be reduced by as much as 90%, though it would still be generally regarded as an acceptable rate of working. For harder rocks the rate is even lower until one reaches rock compressive strengths approaching 7,000 Ibs/sq. in., when other methods, such as blasting, must be adopted, which significantly increases the time and cost of the whole operation. Attempts have been made to adopt dry rock cutting techniques, for example by fitting teeth or picks to the cutter blades, but these have not been particularly successful due in part to a lack of understanding of the physical properties of underwater rock formations. It is an object of the present invention to provide an improved cutter head for a suction dredger which is capable of operating on harder rocks than at present possible, or which can achieve a higher rate of removal than can be obtained at present for a given rock strength. The present invention consists in a cutter head for a suction dredger which includes a central boss mountable upon a power drive shaft and suction head of the dredger, wherein the boss carries at least one spiral-helical web upon which is mounted an array of cutter bits spaced at intervals along the web and projecting therefrom so that their tips define a generally part-ellipsoidal envelope, the working direction of the bits and the «hand» of the spiral-helix of the web being such that in use the cuts made by successive bits on the same web are staggered relatively to one another each succeeding cut being nearer to the larger diameter end of the cutter head. In the accompanying drawings: Figure 1 is a side view of one form of cutter head according to the present invention, Figure 2 is a longitudinal section through the cutter head on Figure 1, and Figure 3 is a cross section taken in a spiral plane starting at line 3-3 of Figure 1. In carrying the invention into effect according to one convenient mode by way of example, a cutter head for a suction dredger includes a central boss 11 adapted to be fitted on the drive shaft 12 of suction head of known form of a suction dredger. Welded to the central boss are four interposed closely-spaced pairs of spiral-helical webs 1 3 of metal sheet or plate material thus forming a fourstart spiral-heiical channel system, between adjacent pairs of web pairs, each channel being of about 1 turns. At the larger diameter end the webs 13 are joined to a pair of annular rings 14 positioned coaxially with the axis of the boss 11 and at right angles thereto. At the smaller diameter end the webs 13 are joined to a pair of conical rings 23 positioned coaxially with the axis of the boss, and whose included angle is about 600. The webs 1 3 are so dimensioned that in longitudinal profile they define a curve 1 5 which is part of a near ellipse and is chosen so as to present the optimum angle of attack to the sea bed whatever the angle of the axis of the cutter to the horizontal in use. The peripheries of the webs and the annular rings are provided with cut-outs 1 6 in which are welded mounting plates 1 7 each of which bridges the pair of webs or rings and upon which is mounted a block 1 8 holding a cutter bit 1 9 so that an array of cutter bits 19 is formed. The cut-outs are so dimensioned that the tips of the cutter bits 1 9 project beyond the peripheries of the webs, the extent to which they project defining the maximum cutting depth of the bits, and the bits are angled in conventional manner as shown in Figure 3 so as to have a working direction (clockwise in figure 3). The tips of the cutter bits thus define a generally partellipsoidal envelope of the same form as curve 1 5. The cutter bits 1 9 are spaced at intervals around the pairs of webs 1 3 and the working direction of the bits 19 and the «hand» of the spiral-helix of the webs are such that in use the cuts made by successive bits on the same web are staggered relatively to one another each succeeding cut being nearer to the larger diameter end of the cutter head. The pairs of webs 13 are provided with apertures 20 to prevent «bridging» of material between adjacent pairs, and to allow the rearward flow of material to the mouth 21 of the suction head under the action of the suction from the head assisted by the helical form of the webs 1 3. To assist this action scoops 22 are provided between adjacent pairs of scoops 22, but other arrangements may be advantageous. Various modifications may be made within the scope of the present invention. For example, the cutter bits may be replaced by other forms of mining tools such as picks or chisels. Claims
1. A cutter head for a suction dredger which includes a central boss mountable upon a power drive shaft and suction head of the dredger, wherein the boss carries at least one spiral-helical web upon which is mounted an array of cutter bits spaced at intervals along the web and projecting therefrom so that their tips define a generally part-ellipsoidal envelope, the working direction of the bits and the «hand» of the spiral-helix of the web being such that in use the cuts made by successive bits on the same web are staggered relatively to one another, each succeeding cut being nearer to the larger diameter end of the cutter head.
2. A cutter head as claimed in claim 1, wherein the boss carries at least one pair of closely spaced webs and the cutter bits are mounted upon plates bridging the webs.
3. A cutter head as claimed in claim 1 or 2, wherein the cutter bits are mounted in cut-outs in the or each web.
4. A cutter head as claimed in claim 1, 2 or 3, wherein the or each web is provided with axial apertures.
5. A cutter head as claimed in any one of claims 1 to 4, wherein scoops are provided between adjacent turns of the web which, in use, serve to assist the flow of dredged material towards the section head mouth.
6. A cutter head substantially as described with reference to the accompanying drawings.
GB7929046A
1978-08-21
1979-08-21
Cutter head for suction dredger
Expired
GB2032492B
(en)
Priority Applications (1)
Application Number
Priority Date
Filing Date
Title
GB7929046A
GB2032492B
(en)
1978-08-21
1979-08-21
Cutter head for suction dredger
Applications Claiming Priority (2)
Application Number
Priority Date
Filing Date
Title
GB7833976A
GB2034369A
(en)
1978-08-21
1978-08-21
Cutter head for suction dredger
GB7929046A
GB2032492B
(en)
1978-08-21
1979-08-21
Cutter head for suction dredger
Publications (2)
Publication Number
Publication Date
GB2032492A
true
GB2032492A
(en)
1980-05-08
GB2032492B
GB2032492B
(en)
1982-08-11
Family
ID=26268618
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB7929046A
Expired
GB2032492B
(en)
1978-08-21
1979-08-21
Cutter head for suction dredger
Country Status (1)
Country
Link
GB
(1)
GB2032492B
(en)
Cited By (5)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
DE3123963A1
(en)
*
1981-06-19
1983-01-13
Berchem & Schaberg Gmbh, 4650 Gelsenkirchen
«STONE CUTTING HEAD FOR A CUTTING HEAD SUCTION EXCAVATOR»
WO1988003197A1
(en)
*
1986-10-28
1988-05-05
Wakefield Anthony W
Cutting device
US7739812B2
(en)
*
2006-02-28
2010-06-22
Vosta Lmg B.V.
Cutter head and suction dredger
WO2011003869A1
(en)
*
2009-07-06
2011-01-13
Dredging International N.V.
Cutter head for dredging ground, cutter suction dredger provided with such a cutter head and use of the cutter head for dredging ground
KR20120049246A
(en)
*
2009-07-06
2012-05-16
드레징 인터내셔널 엔. 브이.
Cutter head for dredging ground, cutter suction dredger provided with such a cutter head and use of the cutter head for dredging ground
1979
1979-08-21
GB
GB7929046A
patent/GB2032492B/en
not_active
Expired
Cited By (8)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
DE3123963A1
(en)
*
1981-06-19
1983-01-13
Berchem & Schaberg Gmbh, 4650 Gelsenkirchen
«STONE CUTTING HEAD FOR A CUTTING HEAD SUCTION EXCAVATOR»
WO1988003197A1
(en)
*
1986-10-28
1988-05-05
Wakefield Anthony W
Cutting device
US7739812B2
(en)
*
2006-02-28
2010-06-22
Vosta Lmg B.V.
Cutter head and suction dredger
WO2011003869A1
(en)
*
2009-07-06
2011-01-13
Dredging International N.V.
Cutter head for dredging ground, cutter suction dredger provided with such a cutter head and use of the cutter head for dredging ground
BE1018585A3
(en)
*
2009-07-06
2011-04-05
Dredging Int
CUTTING HEAD FOR DAGGING GROUND, CUTTING DRAINER PROVIDED WITH SUCH CUTTING HEAD, AND USE OF THE CUTTING HEAD FOR Dredging Ground.
KR20120049246A
(en)
*
2009-07-06
2012-05-16
드레징 인터내셔널 엔. 브이.
Cutter head for dredging ground, cutter suction dredger provided with such a cutter head and use of the cutter head for dredging ground
AU2010270277B2
(en)
*
2009-07-06
2015-11-12
Dredging International N.V.
Cutter head for dredging ground, cutter suction dredger provided with such a cutter head and use of the cutter head for dredging ground
KR101697622B1
(en)
2009-07-06
2017-01-18
드레징 인터내셔널 엔. 브이.
Cutter head for dredging ground, cutter suction dredger provided with such a cutter head and use of the cutter head for dredging ground
Also Published As
Publication number
Publication date
GB2032492B
(en)
1982-08-11
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Legal Events
Date
Code
Title
Description
1984-04-26
PCNP
Patent ceased through non-payment of renewal fee
