DK147061B

DK147061B - Method for taking in the catch from a trawl, as well as a trawl and a fish pump for use in carrying out the method

Info

Publication number: DK147061B
Application number: DK435782A
Authority: DK
Inventors: Solbjoern Jacobsen
Original assignee: Solbjoern Jacobsen
Priority date: 1981-02-04
Filing date: 1982-10-01
Publication date: 1984-04-02
Also published as: DK435782A; DK147061C

Description

147061147061

Opfindelsen angår en fremgangsmåde til bjærgning af fangsten fra et trawl, hvor fiskene gennem en pumpeledning med en pumpe pumpes ombord på skibet fra trawlets trawlpose, der befinder sig i vandet. Opfin-5 delsen angår tillige et trawl og en fiskepumpe til brug ved udøvelsen af fremgangsmåden.The invention relates to a method for salvaging the catch from a trawl, where the fish are pumped on board the ship from a trawl's trawl bag which is in the water through a pump line with a pump. The invention also relates to a trawl and a fish pump for use in the practice of the method.

Ved en kendt metode af ovennævnte art bjærges fangsten, ved at en fiskepumpe fra skibet kobles til trawlposen* efter at denne er trukket ind på siden af skibet. Ulem-10 pen ved denne kendte metode er, at posen i dårligt vejr oftest når at synke, inden pumpen er placeret i posen.By a known method of the above-mentioned type, the catch is salvaged by coupling a fish pump from the ship to the trawl bag * after it has been pulled into the side of the ship. The disadvantage of this known method is that the bag in bad weather most often reaches sink before the pump is placed in the bag.

Ligeledes synker posen ofte under pumpningen. Årsagen er, at når posen bevæges i bølgegang, siver luften fra de sprængte svømmeblærer hurtigt ud af fiskene, og opdriften 15 reduceres. Skibet ligger med siden til trawlposen under pumpningen og er vanskeligt at manøvrere, hvilket ikke gør det lettere, når vanskelighederne opstår.Also, the bag often sinks during pumping. The reason is that as the bag moves in a wave, the air from the ruptured swim bladders quickly seeps out of the fish and the buoyancy 15 is reduced. The ship lies to the side of the trawl bag during the pumping and is difficult to maneuver, which does not make it easier when the difficulties arise.

Af foranstående fremgår, at bjærgning af fangsten er et problem, når vejret er dårligt. Det skal forstås sådan, 20 at det vejr, hvori man kan sætte trawlet ud fra skibet og fiske med trawlet, kan være dårligere end det vejr, hvorunder man kan bjærge fangsten.From the above it can be seen that salvaging the catch is a problem when the weather is bad. It should be understood that the weather in which you can set the trawl out of the ship and fish with the trawl may be worse than the weather during which you can salvage the catch.

Formålet med opfindelsen er at angive en fremgangsmåde af den indledningsvis angivne art, som gør det muligt 25 at bjærge fangsten under lige så dårlige vejrforhold, som man kan fiske i. Desuden er det et formål med opfindelsen at angive et trawl og en fiskepumpe til brug ved udøvelsen af fremgangsmåden.The object of the invention is to provide a method of the kind mentioned in the preamble, which allows the catch to be recovered in as bad weather conditions as one can fish in. In addition, it is an object of the invention to provide a trawl and a fish pump for use. in the practice of the method.

Fremgangsmåden ifølge opfindelsen er ejendommelig ved, 30 at pumpen, før trawlet sættes i vandet for fiskning, fastgøres til trawlposen, og pumpeledningen samt kraft- 147061 2 overføringsledningerne (hydraulikslanger, elektriske kabler, trykluftledninger) føres et stykke op mod trawl-mundingen, fortrinsvis op til trawlposens munding, og fastgøres til trawlet, og hvor pumpeledningen samt kraft-5 overføringsledningerne forsynes med koblinger for tilkobling af en pumpeledning samt kraftoverføringsledninger fra skibet, og når trawlet skal tømmes for fisk, hales det kun så langt ind, at man ombord kan tilkoble kraftoverføringsledninger og pumpeledningen fra skibet 10 til de tilsvarende ledninger på trawlet, hvorefter pumpen startes, og fiskene pumpes ombord, og efter endt pumpning frakobles ledningerne, og trawlet føres tilbage i fiskestillingen.The method according to the invention is characterized in that before pumping the trawl into the water for fishing, the pump is attached to the trawl bag and the pump line and power transmission lines (hydraulic hoses, electric cables, compressed air lines) are pushed up slightly towards the trawl mouth, preferably to the mouth of the trawl bag, and attached to the trawl, and where the pump line and power transmission lines are provided with couplings for connecting a pump line and power transmission lines from the ship, and when the trawl is to be emptied of fish, it is only hauled in so far that it can be connected on board power transmission lines and the pump line from the ship 10 to the corresponding lines on the trawl, after which the pump is started and the fish are pumped on board, and after the pumping is completed the lines are disconnected and the trawl is returned to the fishing position.

Ved denne fremgangsmåde er det uden betydning, om 15 trawlposen synker, idet det kun er et spørgsmål om at tilkoble ledningerne fra trawlet med ledningerne fra skibet for at kunne pumpe fiskene ombord. Det vil altid i så hårdt vejr, som det er muligt at fiske i, være gørligt at hale nettet ind og dermed tilkoble led-20 ningerne. Desuden sparer man ved fremgangsmåden tid med at koble pumpen til trawlposen, da den på forhånd allerede er fastgjort til posen. En anden fordel ved opfindelsen er, at pumpeledningen er en trykledning og således ikke behøver at være af en særlig konstruk-25 tion. Et andet væsentligt punkt er, at hele pumpesystemet er passivt under trawlingen og ikke forstyrrer denne på nogen måde.In this approach, it is irrelevant whether the trawl bag sinks, as it is only a matter of connecting the wires from the trawl to the wires of the ship in order to pump the fish on board. It will always be feasible to catch the net in the harsh weather that it is possible to fish in, thus connecting the cables. In addition, the method saves time in connecting the pump to the trawl bag, since it is already attached to the bag in advance. Another advantage of the invention is that the pump line is a pressure line and thus does not have to be of a particular construction. Another important point is that the entire pump system is passive during trawling and does not interfere with it in any way.

Fra beskrivelsen til dansk patent nr. 26331 er der kendt en metode, hvor enden af trawlposen under fiske-30 riet er forbundet med skibet med en ledning, således at fiskene, efterhånden som de fanges, pumpes op til skibet. Denne metode er imidlertid ikke praktisabel ved dybhavsfiskeri, som vi kender i dag, f. eks. 200-300 3 147051 favne. Den modstand, ledningen yder, når den trækkes gennem vandet, giver styrkemæssige problemer for selve ledningen, ligesom det betyder en flerdobling af skibets motorkraft.From the specification to Danish Patent No. 26331, a method is known in which the end of the trawl bag during fishing is connected to the ship with a cord so that the fish as they are caught are pumped up to the ship. However, this method is not practicable in deep-sea fishing, as we know today, such as 200-300 3 147051 fathoms. The resistance provided by the cord as it is drawn through the water poses strength problems for the cord itself, as does multiple times the ship's engine power.

5 Fremgangsmåden ifølge opfindelsen er desuden ejendommelig ved, at skibet er i fart under pumpningen, og farten tilpasses tilførslen af den ønskede blanding af fisk og vand til pumpen. Ved at regulere skibets fart tilpas kan man regulere den mængde af fisk, der 10 trykkes agterud i posen og dermed også blandingen af fisk og vand, så der opnås en passende blanding i forhold til pumpens størrelse og dermed den størst mulige reduktion af fiskens beskadigelse. Desuden kan man indsnævre posen et stykke foran pumpen og derved yderii-15 gere regulere tilførslen af fisk.The process of the invention is further characterized in that the ship is at speed during the pumping and the speed is adapted to the supply of the desired mixture of fish and water to the pump. By adjusting the speed of the ship appropriately, one can regulate the amount of fish pushed backwards in the bag and thus also the mixture of fish and water, so that a suitable mixture is obtained in relation to the size of the pump and thus the greatest possible reduction of the fish's damage. In addition, the bag can be narrowed a bit in front of the pump, thereby further regulating the supply of fish.

Ifølge opfindelsen er et trawl til brug ved udøvelsen af fremgangsmåden ejendommelig ved, at der er fastgjort en fiskepumpe til trawlposen under trawlingen, og at en pumpeledning og kraf.toverføringslednin.gerne er ført et 20 stykke op mod trawlets munding, fortrinsvis, op til trawlposensmunding og fastgjort til trawlet, og hvor ledninger er forsynet med koblinger for tilkobling af en pumpeledning og drivindretning ombord på skibet.According to the invention, a trawl for use in the practice of the method is characterized in that a fish pump is attached to the trawl bag during trawling and that a pump line and the power transmission lines are guided 20 up towards the mouth of the trawl, preferably up to the trawl mouth. and attached to the trawl, where wires are provided with couplings for connecting a pump line and drive device on board the ship.

For nemt at kunne inspicere, reparere eller udskifte 25 pumpen er denne hensigtsmæssigt løsbart monteret i enden af trawlposen, hvorved den nemt kan fjernes fra nettet. Ledningerne er ligeledes af samme grunde hensigtsmæssigt løsbart fastgjort til trawlet.To be able to easily inspect, repair or replace the pump, this is conveniently detachably mounted at the end of the trawl bag, so that it can be easily removed from the net. The wires are also suitably releasably attached to the trawl for the same reasons.

Trawlposen er normalt sammensat af ensartede stykker 30 af samme længde, hvorfor ledningerne hensigtsmæssigt er af tilsvarende længde, således at stykkerne umid- 147061 4 delbart kan sammenkobles, udskiftes eller afmonteres.The trawl bag is usually composed of uniform pieces 30 of the same length, which is why the wires are suitably of similar length so that the pieces can be immediately interconnected, replaced or removed.

For at pumpen ikke skal tynge trawlposen ned, er pumpen indkapslet i et hus eller forsynet med anden form for opdriftgivende legeme(r) med tilstrækkelig opdrift 5 til, at pumpen holdes svævende eller tilnærmelsesvis svævende i vandet.To prevent the pump from weighing the trawl bag down, the pump is enclosed in a housing or provided with some other buoyant body (s) with sufficient buoyancy 5 to keep the pump floating or approximately floating in the water.

Under trawlingen eller indhalingen af nettet vil fiskene blive trykket bagud i trawlposen, og for at forhindre, at de stuves sammen i pumpen og tilstopper 10 denne, er der anbragt et spjæld foran eller som en del af denne med drivorganer til at lukke.det under trawlingen og åbne det, når fisken skal pumpes.During trawling or inhalation of the net, the fish will be pushed backward in the trawl bag and to prevent them from being trapped in the pump and clogging it, a damper is provided in front or as part thereof with drive means to close it. trawling and opening it when pumping the fish.

I det følgende skal opfindelsen beskrives nærmere under henvisning til tegningen, der viser 15 fig. 1: en trawler samt et trawl, der af tegningsmæssige grunde er vist forskudt i forhold til hinanden, og hvor trawlet er i fangstposition.In the following, the invention will be described in more detail with reference to the drawing, which shows FIG. 1: a trawler as well as a trawl which for illustrative reasons is shown offset relative to each other and where the trawl is in the catch position.

fig. 2: agterenden af en hæktrawler, hvor nettet 20 er vist koblet ind til skibet for tøm ning og forsynet med en særligt udformet fiskepumpe. Figuren er vist i fortegnet målestok.FIG. 2: the aft end of a stern trawler, where the net 20 is shown connected to the ship for emptying and equipped with a specially designed fish pump. The figure is shown on a scale.

fig. 3: tværsnit i forstørret målestok af pumpen 25 i fig. 2.FIG. 3: enlarged cross-section of the pump 25 of FIG. 2nd

fig. 4: længdesnit gennem pumpen efter linie IV-IV i fig. 3.FIG. 4: longitudinal section through the pump along line IV-IV in fig. Third

147061 5 fig. 5: udsnit af pumpens forende ved linie V-V i fig. 3.FIG. 5: section of the front of the pump at line V-V in fig. Third

På tegningen er: 1 en fiskepumpe forsynet med opdrift for ikke at tyn-5 ge trawlposen ned. Selve fiskepumpen er hydraulisk drevet, men er passiv under fiskeri, fordi den ikke er tilkoblet nogen drivstation. Mellem fiskepumpe og trawlpose er monteret et hydraulisk kontrolleret spjæld, som under fiskeri er lukket for at undgå, at fisk stuves 10 sammen i pumpen og tilstopper denne under fiskeriet.In the drawing: 1 is a fish pump with buoyancy so as not to weigh the trawl bag down. The fish pump itself is hydraulically driven but is passive during fishing because it is not connected to any drive station. Between the fishing pump and trawl bag is mounted a hydraulically controlled damper, which is closed during fishing to prevent fish from being trapped 10 in the pump and clogging it during fishing.

Dette spjælds stilling kan heller ikke ændres under fiskeri, men først (ligesom pumpen) når trawlet er trukket op og hydraulikslangerne er koblet til skibets hydrauliske pumpestation.The position of this damper cannot be changed during fishing either, but only (like the pump) when the trawl is pulled up and the hydraulic hoses are connected to the ship's hydraulic pumping station.

15 2 fiskepumpeslangen, som er fastgjort til trawlposen.15 2 fish pump hose attached to the trawl bag.

3, 4 og 5 hydraulikslanger til fiskepumpen og spjældet, idet slangen 3 hører til spjældet og 4, 5 hører til pumpen. Disse slanger er ligeledes fastgjort til trawlposen og ført op til trawlposens munding.3, 4 and 5 are hydraulic hoses for the fish pump and damper, with the hose 3 belonging to the damper and 4, 5 belonging to the pump. These hoses are also attached to the trawl bag and brought up to the mouth of the trawl bag.

20 Når trawlet er monteret med et system som foran skitseret, er det hensigtsmæssigt, at trawlets sammenføjninger er forstærket med tove i hele trawlets længderetning. Slangerne fastgøres til de relevante tove med ca. 2 m mellemrum. Såfremt der anvendes materialer, 25 som tynger trawlet ned, kompenseres ved at montere slangerne med opdriftskugler med passende mellemrum.20 When the trawl is mounted with a system as outlined above, it is convenient that the trawl joints are reinforced with ropes throughout the longitudinal direction of the trawl. The hoses are attached to the relevant ropes by approx. 2 m apart. If materials that weigh down the trawl are used, compensate by mounting the hoses with buoyancy balls at appropriate intervals.

147061 6147061 6

Foran er hydraulikslangerne afsluttet med ventiler, som først kan åbnes, når disse tilkobles på skibet.At the front, the hydraulic hoses are terminated with valves that can only be opened when they are connected to the ship.

Slangernes længde bestemmes af posens længde og den fri afstand mellem skibet og posen under pumpning.The length of the hoses is determined by the length of the bag and the free distance between the ship and the bag during pumping.

5 Under aktiv trawling vil hele pumpesystemet være passivt og ikke forstyrre trawlingen på nogen måde. Hele systemet ligger også i "læ" af hele den finmaskede del af trawlet. Alle flydetrawl er normalt monteret med fyldningsindikatorer på posen. Disse er ikke på nogen 10 måde koblet sammen med pumpesystemet. Fyldningsindikatorerne sammen med netsonden er koblet til instrumenteringen på broen og orienterer om, hvornår trawlet skal hales ind. Indhalingsproceduren er konventionel, og trawlet køres normalt på en nettromle 6. Når fiske-15 pumpeslange og hydraulikslanger kommer indenbords, standses indhalingen. Hydraulikslångerne kobles til skibets hydrauliksystem, og fiskeslangen kobles til et rør, som afsluttes i skibets afsilingskasse 7. Derefter kan pumpningen påbegyndes ved først at aktivere 20 spjældet mellem pumpen og posen. Pumpe, pose og en del af fornettet hænger agterud fra skibet under pumpningen. Ved at regulere skibets fart tilpas kan man regulere den mængde fisk, som trykkes agterud i posen og til pumpen og derved også blandingen vand/fisk, som 25 pumpes. For at sikre sig, at pumpen ikke "kvæles", hvis skibet får for meget fart, kan man indsnævre posen et stykke, 1-2 favne foran pumpen, og derved bremse fiskens tilstrømning. Derved kan opnås en passende blanding fisk/vand i forhold til pumpens størrelse og 30 dermed den størst mulige reduktion af fiskens beskadigelse.5 During active trawling, the entire pump system will be passive and will not interfere with trawling in any way. The whole system also lies in the "shelter" of the entire fine mesh portion of the trawl. All float trawls are usually fitted with filling indicators on the bag. These are in no way connected to the pump system. The fill indicators together with the mains probe are connected to the instrumentation on the bridge and informs when the trawl is to be hauled in. The inhalation procedure is conventional and the trawl is usually run on a net drum 6. When fish-15 pump hose and hydraulic hoses come inboard, the inhalation stops. The hydraulic hoses are connected to the ship's hydraulic system and the fishing hose is connected to a pipe which terminates in the ship's sealing box 7. Thereafter, the pumping can be started by first activating the damper between the pump and the bag. The pump, bag and part of the net are hanging from the back of the ship during the pumping. By adjusting the ship's speed appropriately one can regulate the amount of fish that is pushed backwards into the bag and to the pump and thereby also the water / fish mixture which is pumped. To ensure that the pump does not "suffocate" if the ship is getting too much speed, one can narrow the bag one piece, 1-2 fathoms in front of the pump, thereby slowing the flow of fish. In this way, a suitable mixture of fish / water can be obtained in relation to the size of the pump and thus the greatest possible reduction of the damage of the fish.

Den foran beskrevne metode er blandt andet karakteri- 147061 7 seret ved, at pumpesystemet under trawlingen er fast monteret i trawlet og ikke tilkoblet skibets hydrauliske system.The method described above is characterized, inter alia, in that the pumping system during the trawling is fixedly mounted in the trawl and not connected to the hydraulic system of the ship.

Når trawlet hales ind, kobles pumpesystemet til ski-5 bets hydrauliske system og fiskesilekassesystem med snaplås. Alle tilkoblingssteder er placeret hensigtsmæssigt i nærheden af stedet, hvor slangerne kommer indenbords med trawlet. Herved undgås operationen med at placere pumpen i posen.When the trawl is hauled in, the pump system is connected to the ski bed's hydraulic system and snap-lock fish sling system. All connection points are conveniently located near the place where the hoses come inboard with the trawl. This avoids the operation of placing the pump in the bag.

10 Pumpningen kan starte straks og fortsætte, selv om posen synker.10 Pumping can start immediately and continue even if the bag drops.

Når posen er pumpet tom, frakobles slangerne, og trawlet sættes ud igen, uden at posen har været taget indenbords. Derved spares meget tid.When the bag is pumped empty, the hoses are disconnected and the trawl is put out again without the bag being taken inboard. This saves a lot of time.

15 Ingen af de foran beskrevne operationer er kritiske under vanskelige vejrforhold, og metoden vil i væsentlig grad forbedre effektiviteten for kombinerede trawl/ notbåde, side- og hæktrawlere samt også for partrawlere, ligesom metoden kan benyttes ved overførsel af 20 fangsten fra ét skib til et andet. Det vil sige, hvor trawlposen frigøres fra et trawl trukket af et skib, og hvor et andet skib så kommer og samler fangsten op.15 None of the operations described above are critical in difficult weather conditions, and the method will significantly improve the efficiency of combined trawl / net boats, side and stern trawlers as well as part trawlers, and the method can be used for transferring the 20 catches from one ship to one. other things. That is, where the trawl bag is released from a trawl pulled by a ship and where another ship then comes and collects the catch.

Metoden er beskrevet i forbindelse med flydetrawl, men er også anvendelig ved andre typer, for eksempel bund-25 trawl og ringnoter.The method is described in connection with float trawling, but is also applicable to other types, such as bottom trawl and ring notes.

Med hensyn til pumpen kan der anvendes pumper med vidt forskellig konstruktion, men på tegningens fig. 2-5 er der for fuldstændighedens skyld angivet et udførelseseksempel for en pumpe, der kan benyttes ved udøvelsen 147061 8 af fremgangsmåden ifølge opfindelsen.With regard to the pump, pumps of widely different construction can be used, but in the drawing of FIG. 2-5, for the sake of completeness, there is provided an exemplary embodiment of a pump which may be used in the practice of the method of the invention.

Med henvisning til tegningens fig. 4 omfatter pumpen en centrifugalpumpe 8 af den art, der sædvanligvis anvendes som fiskepumpe. Centrifugalpumpen trækkes over 5 et gear af en hydraulisk motor 9. Pumpeslangen 2 tilkobles centrifugalpumpens udløbsåbning 10.Referring to FIG. 4, the pump comprises a centrifugal pump 8 of the kind commonly used as a fish pump. The centrifugal pump is pulled over a gear by a hydraulic motor 9. The pump hose 2 is connected to the centrifugal pump outlet opening 10.

Centrifugalpumpens indløbsåbning 11 er forlænget med et rørstykke 12 omkring hvilke der er en ringformet kasse 13, hvor rørstykket står i forbindelse med kas-10 sen gennem en række huller 14, og hvor kassen på sin side har en indløbsåbning 15 for havvand, se fig. 5.The inlet opening 11 of the centrifugal pump is extended with a pipe piece 12 around which is an annular box 13, the pipe piece communicating with the box 10 through a series of holes 14, and the box in turn having an inlet opening 15 for seawater, see fig. 5th

Funktionen deraf skal forklares i det følgende.The function thereof must be explained in the following.

Centrifugalpumpen med påmonteret udstyr er fastgjort til et stel bestående af et antal rørbøjler 16 fast-15 boltet til en cirkulær plade 17, idet rørbøjlernes ender er forsynet med en fod i form af et stykke fladjern . I midten af den cirkulære plade 17 er deren udsparing 18 i forbindelse med centrifugalpumpens indløbsåbning 11. Bagest i stellet er der en anden cirku-20 lær plade 20, hvortil bøjlerne er fastgjort. Centrifugalpumpen med udstyr er fastgjort til stellet ved, at gearet og hydraulikmotoren er fastboltet til den bageste plade 20 over en flangering 21, idet motoren 9 stikker gennem et hul i pladen 20.The centrifugal pump with attached equipment is attached to a frame consisting of a plurality of tubular brackets 16 bolted to a circular plate 17, the ends of the tubular brackets being provided with a foot in the form of a piece of flat iron. In the center of the circular plate 17 there is a recess 18 in connection with the centrifugal pump inlet opening 11. At the rear of the frame there is another circular leather plate 20 to which the shackles are attached. The centrifugal pump with equipment is attached to the frame by the gear and hydraulic motor being bolted to the rear plate 20 over a flange ring 21, the motor 9 protruding through a hole in the plate 20.

25 Fortil er centrifugalpumpen fastgjort ved, at den ringformede kasse 13 med bolte 22 er fastboltet til stelpladen 17. Den ringformede kasse 13 er med afstandsrør 23 omkring boltene holdt i en afstand fra pladen 17, og i det således frembragte mellemrum er der om en ak- 147061 9 sel 24 lejret en svingbar spjældklap 25, der med en hydraulikcylinder 25 kan bringes til at lukke og åbne for pumpens indløbsåbning. Normalt vil hydraulikcylinderen blive betjent af en selvstændig hydraulikslange, 5 men man kan også tænke sig den drevet af differenstrykket over hydraulikmotoren. Med hensyn til spjældklappen 25 kan den være en integreret del af centrifugalpumpen .25 The centrifugal pump is furthermore fixed by the annular box 13 with bolts 22 being bolted to the frame plate 17. The annular box 13 is spaced around the bolts at a distance from the plate 17 with spacers 23, and in the space thus formed there is about an axis. The belt 24 is mounted with a pivotable damper flap 25 which can be closed and opened with a hydraulic cylinder 25 for the pump inlet opening. Normally, the hydraulic cylinder will be operated by an independent hydraulic hose, but it may also be thought to be driven by differential pressure across the hydraulic motor. With respect to the damper flap 25, it may be an integral part of the centrifugal pump.

For at kompensere for pumpens vægt, således at den ikke 10 tynger enden af trawlposen ned, er stellet forsynet med et antal opdriftgivende kugler 27 af samme art, der anvendes til at holde trawlmundingen udspilet. Kuglerne er dels anbragt i en ring inden i den ringformede kasse 13 og på pladen 20, idet de parvis er fastboltet på 15 begge sider af pladen.To compensate for the weight of the pump so that it does not weigh down the end of the trawl bag, the frame is provided with a plurality of buoyant balls 27 of the same kind used to keep the trawl mouth spilled. The balls are partly arranged in a ring within the annular box 13 and on the plate 20, being bolted in pairs on both sides of the plate.

Det skal nævnes, at stellet yder beskyttelse af pumpen, når den under trawling slæbes hen over havbunden eller slår mod skibssiden under indhaling af nettet.It should be mentioned that the frame provides protection for the pump when it is trawled across the seabed or strikes the ship's side while hauling the net.

Funktionen af pumpen er, som følger: Når nettet er ha-20 let ind og de forskellige slanger tilkoblet som vist på fig. 2, startes hydraulikmotoren for centrifugalpumpen, og spjældklappen er i sin lukkede stilling.The function of the pump is as follows: When the mains are hollow in and the various hoses are connected as shown in FIG. 2, the centrifugal pump hydraulic motor is started and the damper flap is in its closed position.

Centrifugalpumpen starter da med at suge rent havvand, idet den trækker vandet ind gennem åbningen 15 i den 25 ringformede kasse 13 og gennem hullerne 14 i rørstykket 12. Først når pumpen er i gang, åbnes spjældklappen, og fisken strømmer til pumpen. Spjældklappen svinger da samtidig over og lukker for indsugningen 15 i den ringformede kasse.The centrifugal pump then starts to suck clean seawater, drawing the water in through the opening 15 of the annular box 13 and through the holes 14 in the pipe piece 12. Only when the pump is running, the flap is opened and the fish flows to the pump. The damper flap then simultaneously swings over and closes the intake 15 in the annular box.

Claims

147061

A method of salvaging the catch from a trawl, in which the fish are pumped through a pump line (2) with a pumping needle) from the trawl's trawl bag, which is in the water, and onto the ship, characterized by the fact that before the trawl put into the water for fishing, a pump (1) is attached to the trawl bag, which pump (1) is held passive during trawl nobody, and that the pump line (2) and the power transmission lines (hydraulic hoses, electric cables, compressed air lines) (3, 4, 5) is brought up 10 towards the mouth of the trawl, preferably up to the mouth of the trawl bag, and is attached to the trawl, and where the pump line (2) and the power transmission lines (3, 4, 5) are provided with couplings for connecting the pump line (2) and power transmission lines ( 3, 4, 5) from the ship, 15 and when the trawl is to be emptied of fish, it is only hauled in so far that one can connect the ship's power transmission lines as well as the pump line to the power transmission lines (3, 4, 5) and the pump line (2) at the trawl, after which the pump (1) is started and the fish are dumped on board, and after the pumping has ended, the wires (2, 3, 4, 5) are disconnected and the trawl is returned to the fishing position.

A method according to claim 1, characterized in that the ship is at speed during the pumping and the speed is adapted to the supply of the desired mixture of fish 25 and water to the pump (1).

Method according to claim 2, characterized in that the trawl bag narrows in front of the pump (1).

A trawl for use in the method of claim 1, wherein a fish pump (1) is attached to the trawl bag, characterized in that the fish pump is attached to the trawl during trawling and the pump line (2)