WO1996032008A1 - Steering equipment for midwater trawl - Google Patents

Steering equipment for midwater trawl Download PDF

Info

Publication number
WO1996032008A1
WO1996032008A1 PCT/IS1996/000003 IS9600003W WO9632008A1 WO 1996032008 A1 WO1996032008 A1 WO 1996032008A1 IS 9600003 W IS9600003 W IS 9600003W WO 9632008 A1 WO9632008 A1 WO 9632008A1
Authority
WO
WIPO (PCT)
Prior art keywords
guide rollers
trawl
wheel carrier
roller
drum
Prior art date
Application number
PCT/IS1996/000003
Other languages
French (fr)
Inventor
Ragnar Boasson
Original Assignee
Ragnar Boasson
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
Application filed by Ragnar Boasson filed Critical Ragnar Boasson
Priority to AU52871/96A priority Critical patent/AU5287196A/en
Publication of WO1996032008A1 publication Critical patent/WO1996032008A1/en

Links

Classifications

    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
    • A01K73/00—Drawn nets
    • A01K73/02—Trawling nets
    • A01K73/06—Hauling devices for the headlines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B21/00—Tying-up; Shifting, towing, or pushing equipment; Anchoring
    • B63B21/56—Towing or pushing equipment
    • B63B21/66—Equipment specially adapted for towing underwater objects or vessels, e.g. fairings for tow-cables
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B35/00—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
    • B63B35/14—Fishing vessels
    • B63B35/16—Trawlers
    • B63B35/18—Trawlers adapted to dragging nets aboard

Definitions

  • the invention relates to a method and equipment for midwater trawling mainly for steering the midwater trawl onto a trawl drum by using four vertical guide rollers, where two guide rollers are between the trawl lines and two guide rollers are on the outside, and is based on moving the two front guide rollers that are between the lines and used for steering the midwater trawl onto the drum, out of the trawl's path.
  • the equipment comprises steering mechanism, driving mechanism and wheel carrier beams that the guide rollers travel along and shift them from a vertical position to a horizontal position above the trawl thus creating a clear path for the trawl onto the drum.
  • a common method for steering the trawl onto the drum is by use of a winch and steel wire ropes to pull the trawl to each side. This is a slow method and the risk of accidents is high. Also by using this method it can be difficult to lay the trawl evenly on the drum.
  • guide rollers are also known for steering the trawl onto the drum.
  • One known method is to shift the rollers into a horizontal position by rotating them round a fixed axis using hydraulic equipment that is fixed to one end of the rollers and travels with mem.
  • Another known method is to pull the rollers down by using mechanical equipment. Both these methods demand complicated machinery that is expensive. Consequently rather few trawlers use this kind of equipment.
  • An American patent no. 3.065.562 comprises a trawling gear for hauling a trawl net and includes two pairs of posts upstanding at the stem. The posts move downwardly out of the path of the net body itself. In Ihis case there is no transverse movement of the posts and they can only steer the lines onto a particular position on the drum and hence can only keep a predetermined distance between the lines.
  • the object of the invention is to present a method and equipment for moving the guide rollers by simpler and less expensive means than is commonly practiced as well as being safe and convenient to use and ensures that the guide rollers by no means hinder the hoisting of the trawl onto the drum.
  • This object is achieved by the method and the equipment being unique in the way that the front guide rollers travel along rails that determine the position and inclination of the rollers depending on where the roller wheels are positioned on the wheel carrier beams.
  • the guide rollers are vertical everywhere on the beams except at each end where they are shifted to a horizontal position and are parallel to the horizontal part of the beams.
  • the front and rear guide rollers are each on wheels that travel on separate wheel carrier beams and the position of the wheels on the wheel carrier beams determines the position and inclination of the front guide rollers but the rear guide rollers are always in vertical position.
  • the equipment according to the invention is unique in respect to that the wheels of the front guide rollers are fixed to a carriage above each roller and the wheel, travelling in the upper wheel carrier beam, is vertically aligned to the roller but the wheel on the lower wheel carrier beam is to the side and forms a lever arm that rotates the roller.
  • Both wheel carrier beams are pe ⁇ endicular to the direction of hoisting and the upper beam is horizontal.
  • the lower beam is also horizontal except at the ends where it curves down vertically. When the wheel rolling along the lower wheel carrier beam moves on to the vertical part of the beam the roller is raised to a horizontal position.
  • the equipment is also unique in the respect that the rear guide rollers outside of the lines, that are always in a vertical position and move along rails parallel to the front guide rollers, steer the trawl lines and the net body towards the middle of the trawl drum.
  • each guide roller can be manoeuvred independently or one front guide roller and one rear guide roller can be locked together and manoeuvred as one unit.
  • the equipment is also unique in the respect that the guide rollers are shifted by means of a chain drive.
  • Figure 1 shows the relative position of guide rollers, trawl drum, rear rollers and the trawl.
  • FIG. 2 section A-A in Figure 1 shows the arrangement of the wheel carrier beams and inclination of the front guide rollers according to the position of the wheels.
  • FIG. 3 section B-B in Figure 1 shows the arrangement of the rear guide rollers and wheel carrier beams.
  • FIG. 4 section C-C in Figure 1 shows the front and rear guide rollers and corresponding carrier beams in direction of movement.
  • Figure 5 shows various arrangements of the lower wheel carrier beam depending on the rotation of the guide rollers.
  • Figure 1 shows relative position of the guide rollers (2,3) to other equipment.
  • the equipment consists of midwater trawl (1), rear guide rollers (2) mat steer the trawl (1) towards the middle of the drum (4), front guide rollers (3) that steer the trawl to each end of the drum (4).
  • the rear guide rollers (2) are guided above and below since they do not cross the path of the trawl (1) on its way onto the drum (4).
  • each guide roller (2,3) can be moved independently but it is also possible to lock a pair of front and rear guide roller together and move as one unit.
  • the front guide rollers (3) are between the trawl lines they need to be shifted to a horizontal position above the trawl body (1) so it can go through unhindered.
  • the rear guide rollers (2) can be used to provide even distribution of the trawl body on the drum.
  • Figure 2 shows the construction of the front guide rollers (3) and their inclination depending on their position.
  • wheels (6,7) that travel on two separate wheel carrier beams (8,9).
  • the upper beam (8) is horizontal all the way and carries the wheel (6) that is directly above the roller (3).
  • the lower beam (9) is also horizontal except at the ends where it curves downward.
  • the wheel on the lower wheel carrier beam (9) is to the side of the roller (3) and forms a lever arm that rotates the roller into a horizontal position (10) when the lower wheel (7) is positioned in the vertical part of the beam (9) and thus forms a clear path for the trawl onto the drum.
  • Figure 3 shows the construction of the rear guide rollers (2).
  • a set of wheels (11) that travel on upper and lower wheel carrier beams (12). They can be manouvred independently and are always in avertical position.
  • Figure 4 shows the rear (2) and front (3) guide rollers relative to each other in direction of movement.
  • the invention described is not limited to the description above but the invention can be implemented in various ways as figure 3 shows.
  • the wheel carrier beams can for example consist of two 45° bends (1) with a straight path inbetween, the bending radius of the wheel carrier beam (2) can be larger or smaller and the bend is not necessarily limited to 90° (3).

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Environmental Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Animal Husbandry (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Ocean & Marine Engineering (AREA)
  • Revetment (AREA)

Abstract

The invention relates to a method and equipment for midwater trawling mainly for steering the midwater trawl (1) onto a trawl drum (4) by using four vertical guide rollers (2, 3), where two guide rollers (3) are between the trawl lines and two guide rollers (2) are on the outside, and is based on moving the two front guide rollers (3) that are between the lines and used for steering the midwater trawl (1) onto the drum (4), out of the trawl's path. The front and rear guide rollers (3) are each on wheels (6, 7) that travel on separate wheel carrier beams (8, 9) and the position of the wheels on the wheel carrier beams determines the position and inclination of the front guide rollers (3) but the rear guide rollers (2) are always in vertical position.

Description

STEERING EQUIPMENT FOR MIDWATER TRAWL
The invention relates to a method and equipment for midwater trawling mainly for steering the midwater trawl onto a trawl drum by using four vertical guide rollers, where two guide rollers are between the trawl lines and two guide rollers are on the outside, and is based on moving the two front guide rollers that are between the lines and used for steering the midwater trawl onto the drum, out of the trawl's path. The equipment comprises steering mechanism, driving mechanism and wheel carrier beams that the guide rollers travel along and shift them from a vertical position to a horizontal position above the trawl thus creating a clear path for the trawl onto the drum.
A common method for steering the trawl onto the drum is by use of a winch and steel wire ropes to pull the trawl to each side. This is a slow method and the risk of accidents is high. Also by using this method it can be difficult to lay the trawl evenly on the drum.
The use of guide rollers is also known for steering the trawl onto the drum. One known method is to shift the rollers into a horizontal position by rotating them round a fixed axis using hydraulic equipment that is fixed to one end of the rollers and travels with mem. Another known method is to pull the rollers down by using mechanical equipment. Both these methods demand complicated machinery that is expensive. Consequently rather few trawlers use this kind of equipment.
An American patent no. 3.065.562 comprises a trawling gear for hauling a trawl net and includes two pairs of posts upstanding at the stem. The posts move downwardly out of the path of the net body itself. In Ihis case there is no transverse movement of the posts and they can only steer the lines onto a particular position on the drum and hence can only keep a predetermined distance between the lines.
The object of the invention is to present a method and equipment for moving the guide rollers by simpler and less expensive means than is commonly practiced as well as being safe and convenient to use and ensures that the guide rollers by no means hinder the hoisting of the trawl onto the drum. This object is achieved by the method and the equipment being unique in the way that the front guide rollers travel along rails that determine the position and inclination of the rollers depending on where the roller wheels are positioned on the wheel carrier beams. The guide rollers are vertical everywhere on the beams except at each end where they are shifted to a horizontal position and are parallel to the horizontal part of the beams. The front and rear guide rollers are each on wheels that travel on separate wheel carrier beams and the position of the wheels on the wheel carrier beams determines the position and inclination of the front guide rollers but the rear guide rollers are always in vertical position.
The equipment according to the invention is unique in respect to that the wheels of the front guide rollers are fixed to a carriage above each roller and the wheel, travelling in the upper wheel carrier beam, is vertically aligned to the roller but the wheel on the lower wheel carrier beam is to the side and forms a lever arm that rotates the roller. Both wheel carrier beams are peφendicular to the direction of hoisting and the upper beam is horizontal. The lower beam is also horizontal except at the ends where it curves down vertically. When the wheel rolling along the lower wheel carrier beam moves on to the vertical part of the beam the roller is raised to a horizontal position.
The equipment is also unique in the respect that the rear guide rollers outside of the lines, that are always in a vertical position and move along rails parallel to the front guide rollers, steer the trawl lines and the net body towards the middle of the trawl drum.
The equipment is also unique in the respect that each guide roller can be manoeuvred independently or one front guide roller and one rear guide roller can be locked together and manoeuvred as one unit.
The equipment is also unique in the respect that the guide rollers are shifted by means of a chain drive.
The invention is illustrated below in more detail with reference to included drawings where: Figure 1 shows the relative position of guide rollers, trawl drum, rear rollers and the trawl.
Figure 2 section A-A in Figure 1 shows the arrangement of the wheel carrier beams and inclination of the front guide rollers according to the position of the wheels.
Figure 3 section B-B in Figure 1 shows the arrangement of the rear guide rollers and wheel carrier beams.
Figure 4 section C-C in Figure 1 shows the front and rear guide rollers and corresponding carrier beams in direction of movement.
Figure 5 shows various arrangements of the lower wheel carrier beam depending on the rotation of the guide rollers.
Figure 1 shows relative position of the guide rollers (2,3) to other equipment. The equipment consists of midwater trawl (1), rear guide rollers (2) mat steer the trawl (1) towards the middle of the drum (4), front guide rollers (3) that steer the trawl to each end of the drum (4). The rear guide rollers (2) are guided above and below since they do not cross the path of the trawl (1) on its way onto the drum (4).
When the trawl is hauled the guide rollers are in the position shown on Figure 1. Each guide roller (2,3) can be moved independently but it is also possible to lock a pair of front and rear guide roller together and move as one unit. In order to reel the trawl body (1) onto the drum (4) it will have to be hauled through the steering equipment. Since the front guide rollers (3) are between the trawl lines they need to be shifted to a horizontal position above the trawl body (1) so it can go through unhindered. When the front guide rollers (3) are in horizontal position the rear guide rollers (2) can be used to provide even distribution of the trawl body on the drum.
Figure 2 shows the construction of the front guide rollers (3) and their inclination depending on their position. On the supporting frame (5) of each roller are wheels (6,7) that travel on two separate wheel carrier beams (8,9). The upper beam (8) is horizontal all the way and carries the wheel (6) that is directly above the roller (3). The lower beam (9) is also horizontal except at the ends where it curves downward. The wheel on the lower wheel carrier beam (9) is to the side of the roller (3) and forms a lever arm that rotates the roller into a horizontal position (10) when the lower wheel (7) is positioned in the vertical part of the beam (9) and thus forms a clear path for the trawl onto the drum.
Figure 3 shows the construction of the rear guide rollers (2). On each end of the roller is a set of wheels (11) that travel on upper and lower wheel carrier beams (12). They can be manouvred independently and are always in avertical position.
Figure 4 shows the rear (2) and front (3) guide rollers relative to each other in direction of movement.
The invention described is not limited to the description above but the invention can be implemented in various ways as figure 3 shows. The wheel carrier beams can for example consist of two 45° bends (1) with a straight path inbetween, the bending radius of the wheel carrier beam (2) can be larger or smaller and the bend is not necessarily limited to 90° (3).

Claims

1. Equipment for midwater trawling mainly for steering the midwater trawl onto a trawl drum (4) by using four vertical guide rollers (2,3), where two guide rollers (3) are between the trawl lines and two guide rollers (2) are on the outside, and is based on moving the two front guide rollers (3) that are between the lines and used for steering the midwater trawl (1) onto the drum (4), out of the trawl's path. The equipment comprises steering mechanism, driving mechanism and wheel carrier beams that the guide rollers travel along and shift them from a vertical position to a horizontal position above the trawl thus creating a clear path for the trawl onto the drum and is characterized by that he front (3) and rear (2) guide rollers are each on wheels that travel on separate wheel carrier beams (8,9,12) and the position of the wheels on the wheel carrier beams determines the position and inclination of the front guide rollers but the rear guide rollers are always in vertical position.
2. Equipment according to claim 1 characterized in that the wheels (6,7) of the front guide rollers are fixed to a carriage (5) above each roller and the wheel (6), travelling in the upper wheel carrier beam (8), is vertically aligned to the roller but the wheel (7) on the lower wheel carrier beam (9) is to the side and forms a lever arm mat rotates the roller. Both wheel carrier beams are peφendicular to the direction of hoisting and the upper beam (8) is horizontal. The lower beam (9) is also horizontal except at the ends where it curves down vertically.
3. Equipment according to claims 1 and 2 characterized in that the rear guide rollers (2) outside of the lines, that are always in a vertical position and move along rails (12) parallel to the front guide rollers (3), steer the trawl lines and the net body (1) towards the middle of the trawl drum.
4. Equipment according to claims 1 - 3 characterized in that each guide roller (2,3) can be manoeuvred independently or one front guide roller (3) and one rear guide roller (2) can be locked together and manoeuvred as one unit.
5. Equipment according to claims 1-4 that is characterized in that the guide rollers are shifted by means of a chain drive.
6. A method in moving guide rollers near a midwater trawl drum based on the use of equipment according to claims 1-5 that is characterized in that the front guide rollers (3) move along rails (8,9) that determine the position and inclination of the rollers depending on where the roller wheels are positioned on the wheel carrier beams. The guide rollers are vertical everywhere on the beams except at each end. Then they are shifted to a horizontal position and are parallel to the horizontal part of the beams.
PCT/IS1996/000003 1995-04-12 1996-04-10 Steering equipment for midwater trawl WO1996032008A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU52871/96A AU5287196A (en) 1995-04-12 1996-04-10 Steering equipment for midwater trawl

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IS4280 1995-04-12
IS4280 1995-04-12

Publications (1)

Publication Number Publication Date
WO1996032008A1 true WO1996032008A1 (en) 1996-10-17

Family

ID=36794541

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IS1996/000003 WO1996032008A1 (en) 1995-04-12 1996-04-10 Steering equipment for midwater trawl

Country Status (2)

Country Link
AU (1) AU5287196A (en)
WO (1) WO1996032008A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104787257A (en) * 2015-05-08 2015-07-22 广西金达造船有限公司 Fisher trawl net roller
CN107117267A (en) * 2017-05-15 2017-09-01 舟山万达船舶设计有限公司 Distant-water trawler
US11352103B2 (en) * 2019-12-06 2022-06-07 Zhejiang Ocean University Trawler with fishing and conveying device and fishing method

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3065562A (en) * 1959-12-02 1962-11-27 Frank J Luketa Trawler

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3065562A (en) * 1959-12-02 1962-11-27 Frank J Luketa Trawler

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104787257A (en) * 2015-05-08 2015-07-22 广西金达造船有限公司 Fisher trawl net roller
CN107117267A (en) * 2017-05-15 2017-09-01 舟山万达船舶设计有限公司 Distant-water trawler
US11352103B2 (en) * 2019-12-06 2022-06-07 Zhejiang Ocean University Trawler with fishing and conveying device and fishing method

Also Published As

Publication number Publication date
AU5287196A (en) 1996-10-30

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