SG182873A1 - Winch line tensioning - Google Patents
Winch line tensioning Download PDFInfo
- Publication number
- SG182873A1 SG182873A1 SG2011005634A SG2011005634A SG182873A1 SG 182873 A1 SG182873 A1 SG 182873A1 SG 2011005634 A SG2011005634 A SG 2011005634A SG 2011005634 A SG2011005634 A SG 2011005634A SG 182873 A1 SG182873 A1 SG 182873A1
- Authority
- SG
- Singapore
- Prior art keywords
- winch
- drum
- winch line
- spooling
- motorized
- Prior art date
Links
- 238000000034 method Methods 0.000 claims abstract description 30
- 238000003860 storage Methods 0.000 claims abstract description 23
- 238000005520 cutting process Methods 0.000 description 2
- 241000700196 Galea musteloides Species 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
- B66D1/00—Rope, cable, or chain winding mechanisms; Capstans
- B66D1/28—Other constructional details
- B66D1/36—Guiding, or otherwise ensuring winding in an orderly manner, of ropes, cables, or chains
Abstract
A method for facilitating a winch line to be tensioned during spooling. Themethod comprising the steps of: unspooling the winch line from a storage receptacle onto a motorized intermediate winch; and re-spooling the winch line from the intermediate winch, under tension, onto a motorized destination winch. Figure 5
Description
WINCH LINE TENSIONING
The invention broadly relates to a method and system for facilitating a winch line to be tensioned during spooling, and to a winch. tn particular, the method and system can facilitate an easy trans-spooling of a wire rope with pre-tension onto a winch drum.
Winches are equipments that are used to pull in or pay out or otherwise adiust the tension of a winch line. Winches generally comprise of a drum, a plurality of support members and a winch fine. The winch iine, typically a rope or steei cable, is spooled onto the drum, usuaily along its length and multiple layers of the winch line can be spooled one above the other. The drum can be manually, electrically or hydrauiically operated and rotated through a gear mechanism acting upon the drum, with the drum being disposed in between the plurality of support members.
Winches have numerous purposes, including the maritime industry. For example, a winch can be mounted on a Floating Production, Storage and Offloading (FPSO) vessel. Examples of such winches are Riser Pulling winches and Turret winches. A FPSO is a fioating tank system used in the offshore oil and gas industry and is designed to store oil or gas produced from a nearby oil rig until the oil or gas can be offioaded onto an oil tanker or sent through a pipeline. Winches on the FPSO can be used to pull in or let out mooring lines so as to facilitate the mooring or disconnection of the FPSO.
Assembling a winch comprises a step of spooling a winch fine onto the drum of the winch. During this step, in order to facilitate the subsequent proper working of a winch, the winch line is preferably uniformly spooled with adjacent coils of the winch line compacted close together and with sufficient pre-tension onto the drum, to prevent the winch line from cutting into itself or becoming entangled, twisted, jammed or bound within the spaces of the lower level of the winch line. For example, if there is a lack of tension during pulling in of the winch line, ‘bird nesting’ of the winch line can occur, where loose coils of the winch line become trapped and tangled under subsequent windings of winch line, and this can cause the winch line {o become severely entangled, jammed or cui.
Once assembly of the various components of the winch {excluding the winch line) is completed, the winch line has to be spooled onto the drum of the winch. The winch line is usually manufactured separately from the other components of the winch and is temporarily spooied on a separate storage drum before being spooled onto the winch. However, the winch line is typically haphazardly spooled in a loosely tensioned manner on the storage receptacle. One method of spooling the winch line onto a winch on a FPSO, to complete the assembly of the winch, involves letting out the winch line from the storage receptacle on the sea and connecting the free end to the winch on the FPSO. The winch on the FPSO is then operated to pull in the winch line so to enable the winch to be completely assembled and ready for subsequent use.
However, drawbacks of the method above include difficulty in controlling the tension of the pulled in winch line. This is because the winch line is typically a few hundred meters long and can be very heavy as it is made of steel cables. In addition, the harsh and unpredictable conditions out at sea, coupled with the winch line being haphazardly spooled in a loosely tensioned manner about the separate storage receptacle prevents the winch line from being uniformly spooled with sufficient tension on the drum of the winch.
A need therefore exists to provide a method and an apparatus for facilitating a winch line to be tensioned when spooled on a drum of a winch that seeks to address at least one of the abovementioned problems.
According to a first aspect of the present invention, there is provided a - method for facilitating a winch line to be tensioned during spooling, the method comprising the steps of: unspooling the winch line from a storage receptacle onto a motorized intermediate winch; and re-spooiing the winch line from the intermediate winch, under tension, onto a motorized destination winch.
The intermediate winch may have a motorized rotating drum having one or more substantially tapered portion(s), and the method may comprise using the tapered portion(s) to guide the winch line under tension to slide towards a portion of the drum having a smallest diameter during re-spooling onto the destination winch.
The motorized rotating drum may comprise a double inverted cone structure, and the method may comprise using the double inverted cone structure to guide the winch line under tension to slide towards the middle of the double inverted cone structure of the drum during re-spooling onto the destination winch.
The motorized rotating drum may comprise a substantially tapered portion, and the method may comprise using the tapered portion to guide the winch line under tension fo slide towards one sidewall of the drum during re-spooling onto the destination winch.
The method may further comprise selecting a number of revolutions during the spooiing onto the intermediate winch based on a required tension for the winch line on the destination winch.
According to a second aspect of the present invention, there is provided a winch for facilitating a winch line to be tensioned during spooling, the winch comprising: a motorized rotating drum having one or more substantially tapered portion(s) such that the one or more substantially tapered portion(s) guides the winch line under tension to slide towards a portion of the drum having a smallest diameter.
The motorized rotating drum may comprise a double inverted cone structure such that the double inverted cone structure guides the winch line under tension to : slide towards slide towards the middie of the double inverted cone structure.
The motorized rotating drum may comprise a substantially tapered portion such that the tapered portion guides the winch line under tension to slide towards one sidewall of the drum.
According to a third aspect of the present invention, there is provided a system for spooling a winch fine under tension, the system comprising: a motorized intermediate winch for spooling the winch line from a storage receptacle; and a motorized destination winch for re-spooling the winch line, under tension, from the intermediate winch.
The intermediate winch may comprise a motorized drum having one or more substantially tapered portion(s) such that the one or more substantially tapered portion{s) guides the winch line under tension to slide towards a portion of the drum having a smallest diameter.
The intermediate winch may comprise a motorized drum having a double inverted cone structure such that the double inverted cone structure guides the winch line under tension to slide towards the middle of the double inverted cone structure.
The intermediate winch may comprise a motorized drum having a substantially tapered portion such that the tapered portion guides the winch line under tension fo slide towards one sidewall of the drum.
Example embodiments of the invention will be better understood and readily apparent to one of ordinary skill in the art from the following written description, by way of example only, and in conjunction with the drawings, in which:
Figure 1 is a top plan illustration of a system for facilitating a winch line to be tensioned during spooling, in accordance with an embodiment of the present invention.
Figures 2(a) and (b) are top plan illustrations of an intermediate winch in accordance with an embodiment of the present invention.
Figure 3 is a top plan illustration of a system for facilitating a winch line to be 5 tensioned during spooling, in accordance with an alternative embodiment of the present invention.
Figures 4(a) and (b) are top plan illustrations of an intermediate winch in accordance with an alternative embodiment of the present invention,
Figure 5 is a flow chart illustrating a method for facilitating a winch line to be tensioned during spooling, according to an embodiment of the present invention.
Figure 1 is a top plan illustration of a system 100 for facilitating a winch line to be tensioned during spooling in accordance with an embodiment of the present invention, comprising a winch line storage receptacle 110, an intermediate winch 120 and a winch 130, to facilitate a winch line 102 to be tensioned when spooling onto a drum 134 of the winch 130. The system 100 and associated tensioning method can be executed on land.
The storage receptacle 110 comprises a freely rotating drum 114 with two side walls 112a / 112b disposed at the ends of the drum 114. The storage receptacle 110 holds the winch line that is to be spooled onto the drum 134 of the winch 130.
The winch line 102 can be haphazardly spooled in a loosely tensioned manner about the drum 114. The intermediate winch 120 comprises two side walls 122a / 122b disposed at the ends of a motorized rotating drum 124 having a double inverted cone structure 126, rotatably mounted between two support members 123a / 123b. The double inverted cone structure 126 comprises 2 conical (tapered) portions disposed adjacent to each other such that the middle portion of the structure 126 is of substantially narrower diameter than the end portions (i.e.. “hourglass shaped”). A motorized hydraulic motor and gear mechanism 125 drives the drum 124. Although the double inverted cone structure 126 is shown in Figure 1 to extend only to a portion of the length of the motorized rotating drum 124 (i.e. remaining portions of the drum 124 have a substantially constant diameter), it will be appreciated that the double inverted cone structure 126 may exiend across the entire length of the motorized rotating drum 124.
The winch line 102 is fed from the storage receptacle 110 to the intermediate winch 120 in the direction indicated by the arrow A. The winch line 102 is spooled onto the double inverted cone structure 126 and the drum 134. The winch 130 comprises two flanges 132a / 132b disposed at the ends of a motorized drum 134.
The drum 134 is mounted between two support members 133a / 133b. An electrical or hydrauiic motor and gear mechanism 135 rotates the drum 134 so as to pull in the winch line 102 in the direction indicated by the arrow A. This creates tension in the winch line 102 and unspools the winch line 102 from the storage receptacle 110, via the intermediate winch 120, and finally onto the drum 134. Controlling the pay in pressure of the drum 134, relative to the relief valve setting of the drum 124, allows the amount of tension on the winch line 102 to be controlled.
The winch 130 comprises a spooling device 136 disposed preceding the drum 134. The spooling device 1368 is coupled to the support members 133a/ 133b by two members 139a / 138b. The winch line 102 passes through a movable eye 138 of the spooling device 136 and the eye 138 positions the winch line 102 with respect to the drum 134 when the winch 130 is pulling in the winch line 102. For example, the eye 138 is able to guide the winch line 102 such that if spools onto the drum 134 progressively from one side to the other. Subsequent layers of the winch line 102 may be spooled onto the drum 134, above a lower spooled layer of the winch line.
Once a layer has been completely spooled from the right side to the left side, the spooling device 136 reverses the direction of the eye 138 such that the winch line 102 now spools above the lower spooled layer, and this process may continue untii the entire length of the winch line 102 has been emptied from the storage receptacle 110 and is completely spooled onto the drum 134. it is noted that the distances between the storage receptacle 110, the intermediate winch 120 and the winch 130 are not drawn to scale in Figure 1. Also, it will be appreciated that additional separate guide element(s} (not shown) may be provided between the intermediate winch 120 and the winch 130, between the storage receptacle 110 and the intermediate winch 120, or both.
In the example embodiment, when the winch line 102 is to be spooled onto the winch 130, the intermediate winch 120 advantageously facilitates the proper tensioning of the winch line 102. Without the intermediate winch 120, proper tensioning of the winch line 102 may not be achieved as the winch line 102 is haphazardly spooled in a loosely tensioned manner about the drum 114 while it is desirous that the winch line 102 is uniformly spooled with sufficient tension about the drum 134 of the winch 130, in order to facilitate the proper working of the winch 130 and relatively tonger wire rope life.
The winch line 102 received from the storage receptacle 110 is fed onto the double inverted cone structure 126. The motorized mechanism 125 facilitates the initial spooling of the winch line 102 onto the double inverted cone structure 126. For the present embodiment, Figure 1 illustrates the winch line 102 feeding onto one conical portion of the double inverted cone structure 126 (i.e. the left conical portion in Figure 1) at a point 128. The winch line 102 is spooled several wraps from the point 128 to a point 129 (i.e.: the middie portion of the double inverted cone structure 126 with the smallest diameter). Varying amounts of the winch line 102 may be spooled onto the one conical portion of the double inverted cone structure 126, keeping in mind that the winch line 102 may only be spooled onto the double inverted cone structure 126 and not the portion with a substantially constant diameter in this example embodiment. The winch line 102 is preferentially unspooled towards the winch 130 at a portion of the double inverted cone structure 126 with the smallest diameter. The point 129 indicates the portion of the double inverted cone structure 126 with the smallest diameter.
The drums of the intermediate winch 120 and the winch 130 are both preferably motorized, enabling tension of the winch line 102 to be controlled during spooling onto the winch 130. Controlling the tension of the winch line 102 during spooling is preferably done by having a difference in maximum torque setting between the drum 124 of the intermediate winch 120 and the drum 134 of the winch 130. For instance, the difference in torque may be established by one drum simply applying more torque than that can be generated by the maximum setting pressure of the relief valve on the other drum. Alternatively, the difference in torque may be established by braking one drum with a desired torque while rotating the other drum.
Controlling the tension of the winch line 102 during spooling advantageously enables the winch line 102 to be properly tensioned when spooling on the drum 134 of the winch 130.
Figure 2(a) illustrates an embodiment of the present invention at a particular instant with the winch line 202 spooled onto one conical portion of the double inverted cone structure 226 (i.e. the left conical portion in Figure 2}. Different segments of the winch line 202 have been shaded differently to show the relative movement of the winch line 202 as it travels along the one conical portion of the double inverted cone structure 228. Subsequent rotations of the drum 224 result in the winch line 202 sliding down in the direction indicated by the arrow B toward the middle portion of the double inverted cone structure 226 with the smallest diameter under the tension in the winch line 202 between the winch 130 (compare Figure 2) and the intermediate winch 220. On the other hand, the reverse conical shape of the other portion of the double conical structure 226 (i.e. the right portion in Figure 2) prevents the winch line from spooling beyond the waist portion. For example, Figure 2(b) illustrates the configuration after one revolution of the intermediate winch 220.
As illustrated, each segment of the winch line 202 has slid down by substantially one time the width of the winch line 202. The winch line at the portion of the double inverted cone structure 226 with the smallest diameter is fed out from the intermediate winch 220. Similarly, new segments of the winch line 202 (from the storage receptacle 110 of Figure 1) are fed onto point 228 vacated as the winch line 202 slides down the one conical portion of the double inverted cone structure 226.
The double inverted cone structure 226 advantageously allows the winch line 202 to be fed at substantially the same point 228 throughout the entire spooling process. As a result, the winch line 202 is preferentially unspooled from the intermediate winch 220 at substantially the same point 230 (the portion of the double inverted cone structure 226 with the smallest diameter) throughout the entire spooling process. The number of coils spooled on the one conical portion 226 also remains substantially the same, and may be selected to suit desired tension requirements.
Figure 3 is a top plan illustration of a system for facilitating a winch line to be tensioned during spooling, in accordance with an alternative embodiment of the present invention. Figures 4(a) and (b) are top plan illustrations of an intermediate winch in accordance with an alternative embodiment of the present invention.
Elements in Figures 3, 4(a) and 4(b) that are physically the same and perform the same function as those in Figures 1, 2(a) and 2(b) have been given the same reference numerals and the description of these elements will not be repeated. in Figure 3, the intermediate winch 120 comprises two side walls 122a/ 122b disposed at the ends of a motorized rotating drum 124 with a substantially tapered portion 326, rotatably mounted between two support members 123a / 123b. Although the substantially tapered portion 326 is shown in Figure 3 to extend only to a portion of the length of the motorized rotating drum 124 (i.e. remaining portions of the drum 124 have a substantially constant diameter), it will be appreciated that the substantially tapered portion 326 may extend across the entire length of the motorized rotating drum 124. The winch line 102 is fed from the storage receptacle 110 to the intermediate winch 120 in the direction indicated by the arrow A. The winch line 102 is spooled onto the substantially tapered portion 326 of the drum 134.
For the present aliernative embodiment, Figure 3 illustrates the winch line 102 feeding onto the substantially tapered portion 326 at a point 128. The winch line 102 is spooled several times from the point 128 to a point 129. Varying amounts of the winch line 102 may be spooled onto the substantially tapered portion 326, keeping in mind that the winch line 102 may only be spooled onto the substantially tapered portion 326 and not the portion with a substantially constant diameter in this example alternative embodiment. The winch line 102 is preferentially unspooled towards the winch 130 at a portion of substantially tapered portion 326 with the smallest diameter, adjacent the sidewall 122b. The point 129 indicates the portion of the substantially tapered portion 326 with the smallest diameter. The substantially tapered portion 326 is formed such that at point 128 there is of substantially larger diameter than at point 129.
Figure 4(a) illustrates an embodiment of the present invention at a particular instant with the winch line 202 spooled onto the substantially tapered portion 426.
Different segments of the winch line 202 have been shaded differently to show the relative movement of the winch line 202 as if travels along the substantially tapered portion 426. Subsequent rotations of the drum 224 result in the winch line 202 sliding down in the direction indicated by the arrow B toward the wall 222b under the tension inthe winch line 202 between the winch 130 (compare Figure 4) and the intermediate winch 220. For example, Figure 4(b) illustrates the configuration after one revolution of the intermediate winch 220. As Hlustrated, each segment of the winch line 202 has slid down by substantially one time the width of the winch line 202. The segment immediately adjacent the wall 222b is fed out from the intermediate winch 220.
Similarly, new segments of the winch line 202 (from the storage receptacle 110 of
Figure 3) are fed onto peint 228 vacated as the winch line 202 slides down the tapered portion 426. The tapered portion 426 advantageously allows the winch line 202 to be fed at substantially the same point 228 throughout the entire spooling process. Similarly, the winch line 202 is preferentially unspooled from the intermediate winch 220 at substantially the same point 230 (the portion of the tapered portion 426 with the smallest diameter that abuts wail 222b) throughout the entire re spooling process. The number of coils spooled on the tapered portion 4286 also remains substantially the same, and may be selected io suit desired tension requirements.
Figure 5 is a flow charl, designated generally as reference numeral 500, illustrating a method for facilitating a winch line to be tensioned during spooling, according to an embodiment of the present invention. At step 502, the winch line is unspooled from a storage receptacle onto a motorized intermediate winch. At step 504, the winch line is re-spooled from the intermediate winch, under tension, onto a motorized destination winch. it will be appreciated by a person skilied in the art that numerous variations and/or modifications may be made fo the present invention as shown in the embodiments without departing from a spirit or scope of the invention as broadly described. The embodiments are, therefore, fo be considered in all respects to be fllustrative and not restrictive.
Although the example embodiments described above comprise a rotating drum having one or more substantially tapered portion(s}, it will be appreciated that in yet another embodiment, there is provided an intermediate winch comprising a drum of substantially constant diameter. However, the embodiments of the present invention as shown in Figures 1 to 4 may provide a number of additional advantages compared to said allernative embodiment. With a constant diameter drum intermediate winch, initially, the winch line is spooled onto the intermediate winch e.g. near the middle of the drum. The winch line unspools from the intermediate winch e.g. at a location adjacent the sidewall of the drum. Upon a few revolutions of the intermediate winch for re-spooling onto the destination winch, the point at which the winch line spools onto the drum will move towards the other sidewall of the drum.
Similarly, the point at which the winch line is unspooled from the drum moves in the same direction. Subsequent revolutions of the intermediate winch will eventually cause the point at which the winch line is spooled onto the drum to reach the sidewall. Starting from the next revolution thereafter, the winch line will now cut onto itself and would start to reverse spooling direction. This may result in tangling-up of the winch line and potential cutting of the winch line where it cuis onto itself.
Furthermore, eventually the spool-on point will cross the unspocling point, at which state continued unspooling may no longer be possible. This may limit the length of line that can be tensioned/spooled in such an embodiment, which can also depend on the relative diameters of the intermediate and the destination winches.
The method and system for facilitating a winch line to be tensioned during spooling in accordance with the described embodiments can advantageously enable tensioning fo be executed on land and in a controlled manner.
Claims (12)
1. A method for facilitating a winch line to be tensioned during spooling, the method comprising the steps of: unspooling the winch line from a storage receptacle onto a motorized intermediate winch; and re-spooling the winch line from the intermediate winch, under tension, onio a motorized destination winch. ic
2 The method as claimed in claim 1, wherein the intermediate winch has a motorized rotating drum having one or more substantially tapered portion(s), and the method comprises using the tapered portions) to guide the winch line under fension to slide towards a portion of the drum having a smallest diameter during re-spooling onto the destination winch,
3. The method as claimed in claim 2, wherein the motorized rotating drum comprises a double inverted cone structure, and the method comprises using the double inverted cone structure to guide the winch line under tension to slide towards the middie of the double inverted cone structure of the drum during re-spooling onto the destination winch.
4. The method as claimed in claim 2, wherein the motorized rotating drum comprises a substantially tapered portion, and the method comprises using the tapered portion to guide the winch line under tension to slide towards one sidewall of the drum during re-spooling onto the destination winch.
5. The method as claimed in any of the preceding claims , further comprising selecting a number of revolutions during the spooling onto the intermediate winch based on a required tension for the winch fine on the destination winch.
6. A winch for facilitating a winch line to be tensioned during spooling, the winch comprising:
a motorized rotating drum having one or more substantially tapered portion(s) such that the one or more substantially tapered portion(s) guides the winch line under tension to slide fowards a portion of the drum having a smallest diameter. 7 The winch as claimed in claim 6, wherein the motorized rotating drum comprises a double inverted cone structure such that the double inverted cone structure guides the winch line under tension to slide towards siide towards the middie of the double inverted cone structure.
8. The winch as claimed in claim 6, wherein the moiorized rotating drum comprises a substantially tapered portion such that the tapered portion guides the winch line under tension to siide towards one sidewall of the drum.
9. A system for spooling a winch line under tension, the system comprising: a motorized intermediate winch for spooling the winch line from a storage receptacle; and a motorized destination winch for re-spooling the winch line, under tension, from the intermediate winch.
10. The system as claimed in claim 9, wherein the intermediate winch comprises a motorized drum having one or more substantially tapered portion(s) such that the one of more substantially tapered portion(s) guides the winch line under tension to slide towards a portion of the drum having a smallest diameter.
11. The system as claimed in claim 9, wherein the intermediate winch comprises a molorized drum having a double inverted cone structure such that the double inverted cone structure guides the winch line under tension to slide towards the middie of the double inverted cone structure.
12. The system as claimed in claim 9, wherein the intermediate winch comprises a motorized drum having a substantially tapered portion such that the tapered portion guides the winch line under tension to slide towards one sidewall of the drum.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SG2011005634A SG182873A1 (en) | 2011-01-26 | 2011-01-26 | Winch line tensioning |
| PCT/SG2012/000018 WO2012102676A1 (en) | 2011-01-26 | 2012-01-20 | Winch line tensioning |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SG2011005634A SG182873A1 (en) | 2011-01-26 | 2011-01-26 | Winch line tensioning |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| SG182873A1 true SG182873A1 (en) | 2012-08-30 |
Family
ID=46581054
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SG2011005634A SG182873A1 (en) | 2011-01-26 | 2011-01-26 | Winch line tensioning |
Country Status (2)
| Country | Link |
|---|---|
| SG (1) | SG182873A1 (en) |
| WO (1) | WO2012102676A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103803439B (en) * | 2014-02-17 | 2016-05-25 | 上海瑞纽机械股份有限公司 | Steel wire rope elevator device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007191233A (en) * | 2006-01-17 | 2007-08-02 | Tesac Wirerope Co Ltd | Wire rope tension device |
-
2011
- 2011-01-26 SG SG2011005634A patent/SG182873A1/en unknown
-
2012
- 2012-01-20 WO PCT/SG2012/000018 patent/WO2012102676A1/en active Application Filing
Also Published As
| Publication number | Publication date |
|---|---|
| WO2012102676A1 (en) | 2012-08-02 |
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