NL2031377A - Grille and working method for preventing side thruster from being wound - Google Patents

Grille and working method for preventing side thruster from being wound Download PDF

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Publication number
NL2031377A
NL2031377A NL2031377A NL2031377A NL2031377A NL 2031377 A NL2031377 A NL 2031377A NL 2031377 A NL2031377 A NL 2031377A NL 2031377 A NL2031377 A NL 2031377A NL 2031377 A NL2031377 A NL 2031377A
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NL
Netherlands
Prior art keywords
blades
propeller
grid
impellers
side screw
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Application number
NL2031377A
Other languages
Dutch (nl)
Inventor
Liu Hewei
Original Assignee
Fishery Machinery & Instrument Res Inst Cafs
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Publication date
Application filed by Fishery Machinery & Instrument Res Inst Cafs filed Critical Fishery Machinery & Instrument Res Inst Cafs
Publication of NL2031377A publication Critical patent/NL2031377A/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H5/00—Arrangements on vessels of propulsion elements directly acting on water
    • B63H5/07—Arrangements on vessels of propulsion elements directly acting on water of propellers
    • B63H5/14—Arrangements on vessels of propulsion elements directly acting on water of propellers characterised by being mounted in non-rotating ducts or rings, e.g. adjustable for steering purpose
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H5/00—Arrangements on vessels of propulsion elements directly acting on water
    • B63H5/07—Arrangements on vessels of propulsion elements directly acting on water of propellers
    • B63H5/14—Arrangements on vessels of propulsion elements directly acting on water of propellers characterised by being mounted in non-rotating ducts or rings, e.g. adjustable for steering purpose
    • B63H5/15—Nozzles, e.g. Kort-type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H5/00—Arrangements on vessels of propulsion elements directly acting on water
    • B63H5/07—Arrangements on vessels of propulsion elements directly acting on water of propellers
    • B63H5/16—Arrangements on vessels of propulsion elements directly acting on water of propellers characterised by being mounted in recesses; with stationary water-guiding elements; Means to prevent fouling of the propeller, e.g. guards, cages or screens
    • B63H5/165—Propeller guards, line cutters or other means for protecting propellers or rudders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H25/00—Steering; Slowing-down otherwise than by use of propulsive elements; Dynamic anchoring, i.e. positioning vessels by means of main or auxiliary propulsive elements
    • B63H25/42—Steering or dynamic anchoring by propulsive elements; Steering or dynamic anchoring by propellers used therefor only; Steering or dynamic anchoring by rudders carrying propellers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T70/00—Maritime or waterways transport
    • Y02T70/50—Measures to reduce greenhouse gas emissions related to the propulsion system

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Other Liquid Machine Or Engine Such As Wave Power Use (AREA)

Abstract

Provided is a grille for preventing a side thruster from being wound. The grille includes shaft supports and impellers, where each of the shaft supports is provided with several support blades outwards from a shaft of the shaft support, a barrier strip is arranged, and the shaft supports are mounted at pipelines through fasteners to form a fixed grille; each of the impellers includes blades and an impeller hub, short blades are arranged , the impeller hubs are fixed on outer rings of rolling bearings, inner rings of the rolling bearings are fixed on sleeves, and the sleeves are fixed on the shafts, so as to form a movable grille; the shaft supports are closer to a side thruster propeller than the impellers; and at least one electric cutter is arranged on each of the shaft supports, and axes of the electric cutters are parallel to the shafts.

Description

P1224 /NL
GRILLE AND WORKING METHOD FOR PREVENTING SIDE THRUSTER FROM BEING WOUND
TECHNICAL FIELD The present invention relates to ship apparatuses, and in particular to a grille and a working method for preventing a side thruster from being wound, and belongs to the technical field of ship handling.
BACKGROUND ART When the ship sails in the fishing area or marine aguaculture area, the working bow thruster is usually sucked into the rope, resulting in the winding of the side thruster propeller, resulting in the rotation stop of the side thruster propeller, and the need for personnel to go into the water for maintenance, which is ex- tremely inconvenient.
The side thruster is generally placed in the pipeline trans- versely penetrating the hull, and the two ends of the pipeline are provided with detachable grilles. Water flow needs to flow into the pipeline from the exterior of the ship for suction and injec- tion by the side thruster propeller, and therefore, the clearance of the grille is often large, so as to ensure sufficient water flow in and out of the pipeline. Therefore, the grille can gener- ally effectively prevent large solids from being sucked into the pipeline, but it is difficult for the grille to prevent the flexi- ble rope from being sucked into the pipeline, thereby winding the side thruster propeller.
SUMMARY The objective of the present invention is to provide a grille for preventing a side thruster from being wound, such that a rope is blocked at a pipeline inlet and rotates along with an impeller, thereby preventing a propeller from being wound by the rope, and moreover, the impeller wound by the rope has an influence on move- ment parameters of a propeller, thereby giving an alarm for early warning. The present invention uses the following technical solution: a grille for preventing a side thruster from being wound in- cludes shaft supports 200 and impellers 100, where a pair of the shaft supports 200 are arranged, and are coaxially fixed on pipe- lines 900 on two sides of a side thruster propeller 910; each of the shaft supports 200 is provided with several support blades 210 radially and uniformly arranged outwards from a shaft of the shaft support, a barrier strip 220 is arranged at a top edge of each of the support blades 210, and the shaft supports 200 are mounted at openings at two ends of the pipelines 900 through fasteners by means of the barrier strips 220 to form a fixed grille; each of the impellers 100 includes blades 110 and an impeller hub 120, the blades 110 being radially and uniformly distributed in circumfer- ential directions of the impeller hubs 120 until the blades are connected to rims 140, short blades 141 are further inwards ar- ranged on an inner wall of each of the rims 140, the short blades 141 are centripetally and uniformly distributed along the rims 140, the impeller hubs 120 are fixed on outer rings of rolling bearings 130, inner rings of the rolling bearings 130 are fixed on sleeves 150, and the sleeves 150 are fixed on the shafts of the shaft supports 200 through welding or fasteners, so as to form a movable grille; the shaft supports 200 are closer to the side thruster propeller 910 than the impellers 100 on the shaft sup- ports; and at least one electric cutter 160 is arranged on each of the shaft supports 200, and axes of the electric cutters 160 are parallel to axes of the shaft supports 200.
Preferably, the impellers 100 are located inside the pipe- lines 900, and gaps between the impellers and inner walls of the pipelines 900 are less than an outer diameter of a rope.
Preferably, the blades 110 and the support blades 210 are turbine blades, and have the same torsion directions; by taking forward rotation of the side thruster propeller 910 as a bench- mark, torsion directions of the support blades 210 and the blades 110 at flow inlet ends of the pipelines 900 are different from torsion directions of the blades of the side thruster propeller 910, such that water flow entering in front of the side thruster propeller 910 has reverse pre-rotation; and torsion directions of the support blades 210 and the blades 110 at flow outlet ends of the pipelines 900 are the same as the torsion direction of the blades of the side thruster propeller 910, such that the support blades 210 and the blades 110 at the flow outlet ends may recycle energy in water flow flowing out from a rear of the side thruster propeller 910.
Further, the short blades 141 and the blades 110 of the im- pellers in which the short blades are located have the same blade tangent plane, and consistent blade torsion directions, but lengths of the short blades 141 may not reach the impeller hub
120.
Further, the support blades 210 have the same number as the blades 110.
Further, the support blades 210 have the different number as the blades 110.
Further, the rolling bearings are made of engineering plastic having a self-lubricating function; and the electric cutters use disc blades.
Further, cable pipes for supplying power to the electric cut- ters and lubricating oil pipes for supplying oil to the rolling bearings penetrate the pipelines 900 from a hull, and are arranged on corresponding electric and oil apparatuses along the shaft sup- ports 200.
A working method for a grille for preventing a side thruster from being wound uses the grille for preventing a side thruster from being wound of any one of the above, where when the grille works: when a side thruster propeller (910) operates, a suction effect is generated, such that water flow flows to a flow outlet from a flow inlet of a pipeline, and when the water flow flows through impellers (100), the impellers ro- tate; the freely rotating impellers (100) meet a rope prior to the side thruster propeller (210) and wind the rope, thereby prevent- ing the rope from flowing to the side thruster propeller (910), and having a blocking effect together with a fixed grille; the side thruster propeller (910) may still rotate, but the impeller (100) is wound, thereby reducing flow flowing into pipelines
(900), and reducing side thrust; and when a reading of an instru- ment in a cab is changed, it is determined that the rope is wound, and electric cutters (160) are automatically or manually started to cut the rope; and when the grille does not work: the electric cutters are closed. The present invention has the beneficial effects: 1) design is ingenious, the impellers are utilized to block the rope firstly, and then, the shaft supports are utilized for blocking, thereby avoiding winding of the propeller; 2) the rope may be prevented from being wound during forward and reverse navigation; and 3) reverse pre-rotation formed by the flow inlet impeller and the shaft support and energy recycle formed by the flow outlet im- peller and the shaft support are beneficial to improvement of working efficiency of the propeller.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partial perspective schematic diagram of a grille for preventing a side thruster from being wound, which is arranged in a pipeline of a side thruster of a ship (wavy lines in the fig- ure represent outlet of a pipeline on a head-on half side of the grille). FIG. 2 is a cutaway schematic diagram of a shaft support. FIG. 3 is a cutaway schematic diagram of an impeller. In the figures: 900. pipeline, 910. side thruster propeller,
100. impeller, 110. impeller blade, 120. impeller hub, 130. impel- ler rolling bearing, 140. rim, 150. impeller sleeve, 160. electric cutter, 200. shaft support, 210. support blade, and 220. barrier strip.
DETAILED DESCRIPTION OF THE EMBODIMENTS The present invention will be further described below with reference to the accompanying drawings and the particular embodi- ments. With reference to FIGs. 1-3, a grille for preventing a side thruster from being wound is divided into impellers 100 and shaft supports 200, where blades 110 of the impellers are connected to impeller hubs 120 and are radially and uniformly distributed in circumferential directions of the impeller hubs 120 until the blades are connected to rims 140, short blades 141 are centripe- 5 tally and uniformly distributed along the rims 140, the impeller hubs 120 are fixed on outer rings of rolling bearings 130, inner rings of the rolling bearings 130 are fixed on sleeves 150, and the sleeves 150 may be fixed on shafts of the shaft supports 200 through welding or fasteners, so as to form a movable grille; each of the shaft support 200 is provided with several tur- bine blades 210 radially and uniformly arranged outwards from the shaft of the shaft support, a barrier strip 220 is arranged at a top edge of each of the blades 210, and the shaft supports 200 are mounted at openings at two ends of pipelines 900 through fasteners by means of the barrier strips 220 to form a fixed grille; and the shaft supports 200 are closer to blades of a bow thrust- ing propeller 910 than the impellers 100 on the shaft supports, and the impellers 100 are located inside the pipelines 900; and electric cutters 160 are arranged on the shafts of the shaft sup- ports 200, and axes of the cutters are parallel to the shafts of the shaft supports 200.
In this embodiment, there may be a comnon divisor between the number of the blades 110 and the number of the side thruster pro- peller 910 or not; the blades 110 use turbine blades, and a tor- sion direction of the blades 110 is the same as a torsion direc- tion of the blades 210 of the shaft supports 200 connected to the blades in a sleeved manner (that is, torsion trends are the same, but torsion angles of the blades may be the same or different, and “the same direction” hereinafter means this); by taking forward rotation of the side thruster propeller 910 as a benchmark, tor- sion directions of the blades 210 and the blades 110 at flow inlet ends of the pipelines 900 are different from a torsion direction of the blades of the side thruster propeller 910 (that is, torsion trends are opposite, but absolute values of torsion angles of the blades may be the same or different, and “the different direction” hereafter all means this), such that water flow entering in front of the side thruster propeller 910 has reverse pre-rotation; and torsion directions of the blades 210 and the blades 110 at flow outlet ends of the pipelines 900 are the same as the torsion di- rection of the blades of the side thruster propeller 910, such that the blades 210 and the blades 110 at the flow outlet ends may recycle energy in water flow flowing out from a rear of the side thruster propeller 910.
In this embodiment, the short blades 141 and the blades 110 of the impellers in which the short blades are located have the same blade tangent plane, and consistent blade torsion directions of the short blades and the blades, but lengths of the short blades 141 may not reach the impeller hubs 120.
In this embodiment, the number of the blades 210 and the blades 110 may be the same or different.
In this embodiment, the rolling bearings are preferably made of engineering plastic having a self-lubricating function. The electric cutters use disc blades. Cable pipes for supplying power to the electric cutters and lubricating oil pipes for supplying 0il to the rolling bearings may penetrate the pipelines 900 from a hull, and are arranged on corresponding apparatuses along the shaft supports 200.
A basic principle of the present invention is as follows: the freely rotating impellers meet the rope prior to the side thruster propeller and wind the rope, thereby preventing the rope from flowing to the side thruster propeller, i.e. preventing the rope from winding the side thruster propeller, and moreover, having a certain blocking effect on the fixed grille.
When the grille works: when a side thruster propeller 910 op- erates, a suction effect is generated, such that water flow flows to a flow outlet from a flow inlet of a pipeline, and when the wa- ter flow flows through impellers 100, the impellers rotate. The rope is wound by the impellers 100 and thus may not wind the side thruster propeller 910. The side thruster propeller 910 may still rotate. The impellers 100 are wound, thereby reducing flow flowing into the pipelines 900, and reducing side thrust. A driver may de- termine that the rope is wound according to changes of related readings in an instrument in a cab, such that electric cutters 160 are started to cut the rope.
What is described above is a preferred embodiment of the pre- sent invention, and a person of ordinary skill in the art may fur- ther make various changes or modifications on this basis, which should fall within the scope of protection of the present inven- tion without departing from the general concept of the present in- vention.

Claims (9)

CONCLUSIESCONCLUSIONS 1. Rooster om te voorkomen dat een zijschroef wordt opgewonden, omvattende assteunen (200) en waaiers (100), waarbij: een paar van de assteunen (200) zijn opgesteld en coaxiaal beves- tigd op pijpleidingen (900) aan twee zijden van een zijschroefpro- peller (210); elk van de assteunen (200) is voorzien van meerdere steunbladen (210) radiaal en uniform naar buiten gerangschikt zijn vanaf een as van de assteun, een barrièrestrip (220) is aange- bracht aan een bovenrand van elk van de steunbladen (210 ), en de assteunen (200) zijn gemonteerd bij openingen aan twee uiteinden van de pijpleidingen (900) door bevestigingsmiddelen door middel van de barrièrestrips (220) om een vast rooster te vormen; elk van de waaiers (100) schoepen (110) en een waaiernaaf (120) omvat, waarbij de schoepen (110) radiaal en uniform zijn verdeeld in omtreksrichtingen van de waaiernaven (120) totdat de schoepen zijn verbonden met velgen (140), korte bladen (141) verder naar binnen zijn geplaatst op een binnenwand van elk van de velgen (140), de korte bladen (141) centripetaal en gelijkmatig zijn ver- deeld over de randen (140), de waaiernaven (120) zijn vastgezet op buitenste ringen van wentellagers (130), binnenringen van de wen- tellagers (130) zijn bevestigd op bussen (150), en de bussen (150) zijn bevestigd op de assen van de assteunen (200) door middel van lassen of bevestigingsmiddelen, om zo een beweegbaar rooster te vormen; de assteunen (200) dichter bij de zijschroefpropeller (910) zijn dan de waaiers (100) op de assteunen; en ten minste één elektrische doorslijpmachine (160) is aangebracht op elk van de assteunen (200), en de assen van de elektrische doorslijpmachines (160) zich evenwijdig aan de assen van de as- steunen (200) bevinden.A grid for preventing a side screw from winding, comprising shaft supports (200) and impellers (100), wherein: a pair of the shaft supports (200) are arranged and mounted coaxially on pipelines (900) on two sides of a side propeller (210); each of the axle supports (200) has a plurality of support blades (210) arranged radially and uniformly outwardly from an axle support axis, a barrier strip (220) is provided at an upper edge of each of the support blades (210), and the shaft supports (200) are mounted at openings at two ends of the pipelines (900) by fastening means through the barrier strips (220) to form a fixed grid; each of the impellers (100) comprises blades (110) and a impeller hub (120), the blades (110) being radially and uniformly distributed in circumferential directions of the impeller hubs (120) until the blades are joined to rims (140), short blades (141) are positioned further inwardly on an inner wall of each of the rims (140), the short blades (141) are centripetally and evenly distributed over the edges (140), the impeller hubs (120) are fixed on outermost rings of rolling bearings (130), inner rings of the rolling bearings (130) are mounted on bushings (150), and the bushings (150) are attached to the shafts of the shaft supports (200) by means of welding or fasteners, so as to forming a movable grid; the shaft supports (200) are closer to the side propeller propeller (910) than the impellers (100) on the shaft supports; and at least one power cut-off machine (160) is mounted on each of the shaft supports (200), and the axes of the power cut-off machines (160) are parallel to the axes of the shaft supports (200). 2. Rooster om te voorkomen dat een zijschroef wordt opgewonden volgens conclusie 1, waarbij de waaiers (100) zich binnen de pijp- leidingen (900) bevinden en openingen tussen de waaiers en de bin- nenwanden van de pijpleidingen (900) kleiner zijn dan een buiten-The grid for preventing a side screw from winding according to claim 1, wherein the impellers (100) are located within the pipelines (900) and gaps between the impellers and the inner walls of the pipelines (900) are smaller than an outdoor diameter van een touw.diameter of a rope. 3. Rooster om te voorkomen dat een zijschroef wordt opgewonden volgens conclusie 1, waarbij: de bladen (110) en de steunbladen (210) turbinebladen zijn en de- zelfde torsierichtingen hebben; door de voorwaartse rotatie van de zijschroefpropeller (910) als maatstaf te nemen, de torsierichtingen van de steunbladen (210) en de bladen (110) aan de stroominlaatuiteinden van de pijpleidingen (900) verschillend zijn van de torsierichtingen van de bladen van de zijschroefpropeller (910), zodat de waterstroom die binnenkomt voor de zijschroefpropeller (910) een omgekeerde voorrotatie heeft; en torsierichtingen van de steunbladen (210) en de bladen (110) aan de stroomuitlaateinden van de pijpleidingen {900} dezelfde zijn als de torsierichting van de bladen van de zijschroefpropeller (910), zodat de steunbladen ( 210) en de bladen (110) aan de stroomuitlaatuiteinden energie kunnen terugwinnen in de water- stroom die uit een achterkant van de zijschroefpropeller (910) stroomt.The grid for preventing a side propeller from being wound according to claim 1, wherein: the blades (110) and the support blades (210) are turbine blades and have the same directions of torsion; by measuring the forward rotation of the side screw propeller (910) the torsional directions of the backing blades (210) and the blades (110) at the flow inlet ends of the pipelines (900) are different from the torsional directions of the blades of the side propeller propeller ( 910) so that the water stream entering the side screw propeller (910) has a reverse pre-rotation; and torsional directions of the backing blades (210) and the blades (110) at the flow outlet ends of the pipelines {900} are the same as the torsional direction of the blades of the side propeller propeller (910), so that the backing blades (210) and the blades (110) at the stream outlet ends to recover energy in the water stream flowing out a rear of the side screw propeller (910). 4. Rooster om te voorkomen dat de zijschroef wordt opgewonden vol- gens conclusie 1, waarbij de korte bladen (141) en de bladen (110) van de waaiers waarin de korte bladen zich bevinden hetzelfde bladraakvlak en consistente bladtorsierichtingen hebben, maar de lengtes van de korte bladen (141) de waaiernaaf (120) niet kunnen bereiken.The grid for preventing the side screw from winding according to claim 1, wherein the short blades (141) and the blades (110) of the impellers in which the short blades are located have the same blade interface and consistent blade torsion directions, but the lengths of the short blades (141) cannot reach the impeller hub (120). 5. Rooster om te voorkomen dat de zijschroef wordt opgewonden vol- gens conclusie 3, waarbij de steunbladen (210) hetzelfde aantal hebben als de bladen (110).The grid for preventing the side screw from winding according to claim 3, wherein the support blades (210) have the same number as the blades (110). 6. Rooster om te voorkomen dat de zijschroef wordt opgewonden vol- gens conclusie 3, waarbij de steunbladen (210) een ander aantal bladen (110) hebben.The grid for preventing the side screw from winding according to claim 3, wherein the backing blades (210) have a different number of blades (110). 7. Rooster om te voorkomen dat de zijschroef wordt opgewonden vol-7. Grid to prevent side screw from winding full gens conclusie 1, waarbij de wentellagers zijn gemaakt van techni- sche kunststof met een zelfsmerende functie; en de elektrische doorslijpmachines schijfbladen gebruiken.According to claim 1, wherein the rolling element bearings are made of engineering plastic with a self-lubricating function; and the electric power cutters use disc blades. 8. Rooster om te voorkomen dat de zijschroef wordt opgewonden vol- gens conclusie 1, waarbij kabelleidingen voor het leveren van stroom aan de elektrische snijders en smeeroliepijpen voor het toevoeren van olie aan de wentellagers de pijpleidingen (900) van- af een romp binnendringen en zijn aangebracht op bijbehorende elektrische en olie-apparaten langs de assteunen (200).The grille for preventing the side propeller from being wound up according to claim 1, wherein conduits for supplying power to the electric cutters and lubricating oil pipes for supplying oil to the rolling element bearings enter the pipelines (900) from a hull and are mounted on associated electrical and oil devices along the axle stands (200). 9. Werkwijze voor het toepassen van een rooster ter voorkoming van het opwinden van een zijschroef, het gebruiken van het rooster om te voorkomen dat een zijschroef wordt opgewonden volgens een van de conclusies 1-8, waarbij: wanneer het rooster werkt: wanneer een zijpropeller (910) in wer- king is, wordt een zuigeffect gegenereerd, zodat de waterstroom naar een stroomuitlaat stroomt vanuit een stroominlaat van een pijpleiding, en wanneer de waterstroom door waaiers (100) stroomt, draaien de waaiers ; de vrij roterende waaiers (100) ontmoeten een kabel voorafgaand aan de zijschroefpropeller (910) en winden de kabel op, waardoor wordt voorkomen dat de kabel naar de zij- schroefpropeller (910) stroomt, wat samen met een vast rooster een blokkerend effect heeft; de zijschroefpropeller (910) kan nog steeds draaien, maar de waai- er (100) is gewonden, waardoor de stroom die in pijpleidingen (900) stroomt, wordt verminderd en de zijwaartse stuwkracht wordt verminderd; en wanneer een aflezing van een instrument in een cabine wordt veran- derd, wordt vastgesteld dat het touw is gewikkeld, en elektrische snijders (160) worden automatisch of handmatig gestart om het touw door te snijden; en wanneer het rooster niet werkt: de elektrische messen zijn geslo- ten.The method of applying a grid to prevent a side screw from winding, using the grid to prevent a side screw from being wound according to any one of claims 1 to 8, wherein: when the grid is operating: when a side propeller (910) is in operation, a suction effect is generated so that the water flow flows to a flow outlet from a flow inlet of a pipeline, and when the water flow flows through impellers (100), the impellers rotate; the freely rotating impellers (100) meet a cable in front of the side screw propeller (910) and wind the cable, preventing the cable from flowing to the side screw propeller (910), which together with a fixed grid has a blocking effect; the side screw propeller (910) can still rotate, but the impeller (100) is wound, reducing the flow flowing in pipelines (900) and reducing the side thrust; and when a reading from an instrument in a booth is changed, it is determined that the rope has been wound, and electric cutters (160) are started automatically or manually to cut the rope; and if the grid does not work: the electric blades are closed.
NL2031377A 2021-08-27 2022-03-22 Grille and working method for preventing side thruster from being wound NL2031377A (en)

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