Live fish cabin fish protection system and method special for complex sea conditions

Abstract

A live fish cabin fish protection system and method special for complex sea conditions comprises a fish cabin, anti-collision wall bodies are installed in the fish cabin, the anti-collision wall bodies are the same in structure, the two anti-collision wall bodies on the opposite sides correspond to each other and are connected, and the structure of each anti-collision wall body comprises anti-collision strips which are sequentially distributed at intervals from top to bottom; the anti-collision strips are fully distributed along the bulkhead, all the anti-collision strips are communicated with one another, and each anti-collision strip is provided with injection orifices which are uniformly distributed; a fish protection system is arranged between the two anti-collision wall bodies on the opposite sides, and each fish protection system structurally comprises a water pump, the two ends of each water pump are connected with water outside the ship and a discharge port respectively, and meanwhile the two ends of each water pump are connected with the anti-collision wall bodies in parallel through control valves. Through unique design of the fish cabin and installation of the anti-collision walls on the periphery, survival of fishes is effectively protected, the fish cabin can adapt to complex sea conditions, and live fishes are prevented from impacting the cabin wall due to shaking of a ship in the fish cabin, so that survival of the fishes is protected, and the survival effect of the live fishes caught by voyage times of the ship is improved.

Description

Technical Field

[0001] The invention relates to the technical field of fishing vessels, and in particular to a live fish tank fish protection system and method specially used in complex sea conditions. Background Art

[0002] At present, in the prior art, fishing vessels can use freezing and refrigeration to store fish for ocean-going fishing vessels. The caught fish can be stored in a special fish hold. However, for small inland or coastal boats, there is a lack of space for refrigeration and freezing facilities, so the only way is to use the space on the ship to set up a fish hold and store the caught fish in the fish hold. The live fish in the fish hold are then taken to the shore at the dock.

[0003] At the same time, coastal fishery resource survey and fishery law enforcement vessels also need to store live fish after fishing or seizing fish. Setting up fish holds on board is a common storage method. When the sea conditions are good, the ship is less affected by wind and waves, and the shaking is limited. The shaking of water and live fish in the fish hold is also limited. However, when the sea conditions become bad, the wind and waves gradually increase, and the ship is affected by the wind and waves and shakes more violently, causing the water and live fish in the fish hold to shake along with it. In serious cases, the live fish close to the bulkhead of the fish hold hit the bulkhead as the ship shakes, resulting in death, which in turn affects the survival effect of the live fish caught on the voyage. Summary of the invention

[0004] In view of the shortcomings of the above-mentioned existing production technology, the applicant provides a live fish tank fish protection system and method specially used in complex sea conditions, so that on days with severe sea conditions and strong winds and waves, live fish can be placed in the fish tank to collide with the bulkhead due to the shaking of the ship, thereby protecting the fish and improving the survival effect of live fish caught during the ship's voyage.

[0005] The technical solution adopted by the present invention is as follows:

[0006] A live fish tank fish protection system specially used in complex sea conditions comprises a fish tank for storing live fish on a fishing vessel, wherein inner wall surfaces of the fish tank are respectively installed with crash barrier bodies, each crash barrier body has the same structure, and two crash barrier bodies on opposite sides correspond to and are connected to each other, and the structure of a single crash barrier body comprises crash barrier strips spaced from top to bottom, the crash barrier strips are distributed along the tank wall, all the crash barrier strips are interconnected, and each crash barrier strip is provided with uniformly distributed injection ports; a fish protection system is provided between the two crash barrier bodies on opposite sides, and the structure of a single fish protection system comprises a water pump, wherein two ends of the water pump are respectively connected to water outside the ship and a discharge port, and at the same time, the two ends of the water pump are connected in parallel to the crash barrier body through a control valve.

[0007] Its further technical solution is:

[0008] The fish hold adopts a tetrahedral structure.

[0009] The four sides of the fish hold are marked A, B, C, and D in a clockwise direction. The A anti-collision wall is installed at A, the B anti-collision wall is installed at B, the C anti-collision wall is installed at C, and the D anti-collision wall is installed at D.

[0010] Liquid level gauges are installed on the four sides of the fish hold.

[0011] The injection port is in the shape of a square or a circle.

[0012] A method for a live fish tank fish protection system specifically used in complex sea conditions, comprising the following working process:

[0013] Initial state:

[0014] When a ship is sailing in calm waters, it is less affected by the outside world and is only affected by its own motion state. The pitch angle and roll angle change to a limited extent. The ship sails normally and the live fish in the fish hold (1) survive safely. At this time, the control equation of the fish hold fish protection and anti-collision system is:

[0015]

[0016] Among them, t is a certain moment, t-1 is the moment before this moment, ε is the pitch angle control parameter, which can be input into the system by the crew according to the actual situation; σ is the pitch angle control parameter, which can be input into the system by the crew according to the actual situation;

[0017] The ship experiences a large pitching motion:

[0018] When the ship pitches, the bow and stern shake up and down, and the water in the fish hold is affected by inertia. As the ship pitches, the live fish shake with the water, and gradually the fish cannot avoid hitting the front and rear walls of the fish hold.

[0019] At this time, the ship's pitch angle changes violently, and the system control equation shows a single-phase change, as follows:

[0020]

[0021] The ship experiences a large roll:

[0022] When a ship sails to a certain area, it is affected by external wind, waves and currents. When a serious roll occurs, the ship sways from side to side. The water in the fish hold is affected by inertia. As the ship sways laterally, the live fish in the fish hold sways along with the water. Gradually, the fish cannot avoid hitting the left and right bulkheads of the fish hold.

[0023] At this time, the ship's rolling angle changes violently, and the system control equation shows a single-phase change, as follows:

[0024]

[0025] The ship experiences pitch and roll coupling shaking:

[0026] When a ship sails to a certain water area, it is affected by external wind, waves and currents, and there are severe rolls and pitches. The ship sways front and back, left and right, and the water in the fish hold is affected by inertia. As the ship sways in all directions, the live fish in it sways with the water, and gradually the fish are unable to avoid and hit the walls of the fish hold.

[0027] At this time, the ship's roll angle changes dramatically, and the system control equation shows a two-phase change, as follows:

[0028]

[0029] The collision walls on the four sides of the fish hold are defined as A collision wall, B collision wall, C collision wall and D collision wall, and the level gauges installed at each collision wall are A level gauge, B level gauge, C level gauge and D level gauge;

[0030] When the ship is pitching heavily, in order to further judge the actual situation in the fish hold, the control unit reads the reading of the B level gauge installed on the bow bulkhead in the fish hold and the reading of the D level gauge installed on the stern bulkhead at the same time as the control equation changes, and checks them. When the control system logic determines that the following control equation is established, the protection system is activated;

[0031]

[0032] Where t is a certain moment, t-1 is the moment before this moment, LB is the real-time liquid level reading of level gauge B (in mm), and LD is the real-time liquid level reading of level gauge D (in mm);

[0033] The ship experienced a large pitching, and the live fish in the fish hold were pitching continuously with the water in the hold;

[0034] When LB<LD, the water level at the front bulkhead of the fish hold decreases, while the water level at the rear bulkhead increases, and water flows to the rear bulkhead, so that the D anti-collision wall is connected to the anti-collision system, and water is sprayed from the various spray ports on the D anti-collision wall into the rear wall of the fish hold, counteracting the shaking water in the hold and slowing down the collision of the water in the hold and the fish against the rear bulkhead;

[0035] As the ship's pitching cycle changes, when LB>LD, the water level at the front bulkhead of the fish hold rises, and the water level at the rear bulkhead drops. Water flows to the front bulkhead, connecting the B anti-collision wall to the anti-collision system, and spraying water from the various spray ports on the B anti-collision wall into the front wall of the fish hold to offset the shaking water in the hold and slow down the impact of the water in the hold and the fish on the front bulkhead;

[0036] At the same time, due to the action of the water pump, the water outside the ship enters the fish hold, and the water volume in the fish hold increases. At this time, the liquid level LA at the left bulkhead and the liquid level LC at the right bulkhead continue to increase. The water volume in the fish hold is balanced through the action of the water pump and the control valve.

[0037] When the ship gradually calms down, the following control equation holds true:

[0038]

[0039] The control unit controls all executed water pumps and valves to close, and this round of control ends.

[0040] The beneficial effects of the present invention are as follows:

[0041] The invention has a compact and reasonable structure and is easy to operate. Through the unique design of the fish hold and the installation of anti-collision walls on all sides, the survival of the fish can be effectively protected. The invention can adapt to complex sea conditions and place live fish in the fish hold to prevent them from hitting the bulkheads due to the shaking of the ship, thereby protecting the survival of the fish and improving the survival effect of the live fish caught during the ship's voyage. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a schematic diagram of the installation of the fish hold of the present invention.

[0043] Figure 2 It is a front view of the fish hold of the present invention.

[0044] Figure 3 It is a structural schematic diagram of the fish protection system between AC of the present invention.

[0045] Figure 4 It is a structural schematic diagram of the fish protection system between BD of the present invention.

[0046] Among them: 1. Fish hold; 2. Crash wall body; 3. Liquid level gauge; 4. No. 1 discharge port; 5. No. 10 control valve; 6. No. 1 water pump; 7. No. 2 control valve; 8. No. 9 control valve; 9. No. 4 control valve; 10. A crash wall; 11. C crash wall; 12. No. 1 control valve; 13. No. 3 control valve; 14. No. 1 overboard water; 15. No. 2 discharge port; 16. No. 12 control valve; 17. No. 2 water pump; 18. No. 6 control valve; 19. No. 11 control valve; 20. No. 8 control valve; 21. B crash wall; 22. D crash wall; 23. No. 5 control valve; 24. No. 7 control valve; 25. No. 2 overboard water;

[0047] 201. Anti-collision strip; 202. Injection nozzle. DETAILED DESCRIPTION

[0048] The specific implementation of the present invention will be described below in conjunction with the accompanying drawings.

[0049] like Figure 1-Figure 4As shown, the live fish tank fish protection system of this embodiment is specially used in complex sea conditions, including a fish tank 1 for storing live fish on a fishing vessel, and anti-collision wall bodies 2 are respectively installed on the inner wall surfaces of the fish tank 1, each anti-collision wall body 2 has the same structure, and the two anti-collision wall bodies 2 on opposite sides correspond to and are connected to each other, and the structure of a single anti-collision wall body 2 is: including anti-collision strips 201 distributed in sequence from top to bottom, the anti-collision strips 201 are distributed along the bulkhead, all the anti-collision strips 201 are connected to each other, and each anti-collision strip 201 is provided with uniformly distributed injection ports 202; a fish protection system is provided between the two anti-collision wall bodies 2 on opposite sides, and the structure of a single fish protection system is: including a water pump, and the two ends of the water pump are respectively connected to the water outside the ship and the discharge port, and at the same time, the two ends of the water pump are connected in parallel to the anti-collision wall body 2 through a control valve.

[0050] The fish hold 1 adopts a tetrahedral structure.

[0051] The four faces of the fish hold 1 are marked A, B, C, and D in a clockwise direction. An A anti-collision wall 10 is installed at A, a B anti-collision wall 21 is installed at B, a C anti-collision wall 11 is installed at C, and a D anti-collision wall 22 is installed at D.

[0052] Liquid level gauges 3 are respectively installed on the four surfaces of the fish tank 1.

[0053] The injection port 202 is in a square or circular shape.

[0054] The specific structure and function of the live fish tank fish protection system specially used in complex sea conditions described in the present invention are as follows:

[0055] It mainly includes fish hold 1, anti-collision wall body 2, water spraying device, liquid level meter 3, and multiple water pumps, pipe systems and control valves and other components.

[0056] Among them, the fish hold 1 is a special compartment for storing live fish on a fishing vessel. A certain amount of water is poured into it according to the sailing waters to ensure normal water use of the live fish.

[0057] The anti-collision wall body 2 is arranged on the inner wall surface of the fish hold 1, distributed on the four surfaces of the fish hold 1, and marked as A, B, C, and D in the clockwise direction. The A anti-collision wall 10 is installed at A, the B anti-collision wall 21 is installed at B, the C anti-collision wall 11 is installed at C, and the D anti-collision wall 22 is installed at D.

[0058] The structure of the anti-collision wall body 2 on each side is the same, and is distributed from top to bottom through multiple anti-collision strips 201. Each anti-collision strip 201 is provided with a jet port 202. The shape of the jet port 202 can be square or circular, and can be changed according to different needs of actual applications.

[0059] A fish protection system is arranged between AC and between BD respectively, and the structures of the two fish protection systems are the same.

[0060] Specifically, the structure of each component is introduced below:

[0061] The A anti-collision wall 10 is arranged on the port bulkhead of the fish hold 1. The A anti-collision wall 10 is composed of a plurality of water jet pipes (i.e., anti-collision strips 201). Each water jet pipe (i.e., anti-collision strip 201) is provided with a jet port 202, which is arranged along the bulkhead over the entire bulkhead range. There is a distance of about 200 mm between the water jet pipe (i.e., anti-collision strip 201) and the bulkhead.

[0062] The water inlet end of the A anti-collision wall 10 is connected to the outlet of the No. 1 water pump 6 through a pipe, and the water outlet end is connected to the inlet of the No. 1 water pump 6 through a pipe.

[0063] The B anti-collision wall 21 is arranged on the front bulkhead of the fish hold 1 , and the structure of the B anti-collision wall 21 is the same as that of the A anti-collision wall 10 .

[0064] The water inlet end of the B anti-collision wall 21 is connected to the outlet of the second water pump 17 through a pipe, and the water outlet end is connected to the inlet of the second water pump 17 through a pipe.

[0065] The C anti-collision wall 11 is arranged on the starboard bulkhead of the fish hold 1 , and the structure of the C anti-collision wall 11 is the same as that of the A anti-collision wall 10 and the B anti-collision wall 21 .

[0066] The water inlet end of the C anti-collision wall 11 is connected to the outlet of the No. 1 water pump 6 through a pipe, and the water outlet end is connected to the inlet of the No. 1 water pump 6 through a pipe.

[0067] The D anti-collision wall 22 is arranged at the rear bulkhead of the fish hold 1 , and the structure of the D anti-collision wall 22 is the same as that of the A anti-collision wall 10 , the B anti-collision wall 21 and the C anti-collision wall 11 .

[0068] The water inlet end of the D anti-collision wall 22 is connected to the outlet of the second water pump 17 through a pipe, and the water outlet end is connected to the inlet of the second water pump 17 through a pipe.

[0069] The first water pump 6 is installed on board and its start or stop is controlled by the control unit.

[0070] The inlet of the No. 1 water pump 6 sucks the No. 1 outer water 14 through the No. 9 control valve 8.

[0071] The outlet of the No. 1 water pump 6 discharges water overboard (i.e., the No. 1 discharge port 4) through the No. 10 control valve 5.

[0072] The inlet of water pump No. 1 6 is connected to the water outlet of anti-collision belt A through control valve No. 2 7, and the outlet of water pump is connected to the water inlet of anti-collision belt A through control valve No. 1 12; the inlet of water pump No. 1 6 is connected to the water outlet of anti-collision wall C 11 through control valve No. 4 9, and the outlet of water pump is connected to the water inlet of anti-collision wall C 11 through control valve No. 3 13.

[0073] The second water pump 17 is installed on board the ship, and its start or stop is controlled by the control unit.

[0074] The inlet of the No. 2 water pump 17 sucks in the No. 2 ship's outer water 25 through the No. 11 control valve 19.

[0075] The outlet of the No. 2 water pump 17 discharges water out of the ship (i.e., the No. 2 outlet 15) through the No. 12 control valve 16.

[0076] The inlet of the No. 2 water pump 17 is connected to the water outlet of the B crash barrier 21 through the No. 6 control valve 18.

[0077] The outlet of the No. 2 water pump 17 is connected to the water inlet end of the B crash barrier 21 through the No. 5 control valve 23.

[0078] The inlet of the No. 2 water pump 17 is connected to the water outlet of the D anti-collision wall 22 through the No. 8 control valve 20.

[0079] The outlet of the No. 2 water pump 17 is connected to the water inlet end of the D crash barrier 22 through the No. 7 control valve 24.

[0080] The No. 1 control valve 12 is installed on the connecting pipe between the water inlet end of the A crash barrier 10 and the outlet end of the No. 1 water pump 6. It is controlled by the control unit, can control the opening according to the control signal, and feed back the opening state to the control unit.

[0081] The No. 2 control valve 7 is installed on the connecting pipe between the water outlet end of the A anti-collision wall 10 and the inlet end of the No. 1 water pump 6. It is controlled by the control unit, can control the opening according to the control signal, and feed back the opening state to the control unit.

[0082] The third control valve 13 is installed on the connecting pipe between the water inlet end of the C anti-collision wall 11 and the outlet end of the first water pump 6. It is controlled by the control unit, can control the opening according to the control signal, and feed back the opening state to the control unit.

[0083] The fourth control valve 9 is installed on the connecting pipe between the water outlet end of the C anti-collision wall 11 and the inlet end of the first water pump 6. It is controlled by the control unit, can control the opening according to the control signal, and feed back the opening state to the control unit.

[0084] The No. 5 control valve 23 is installed on the connecting pipe between the water inlet end of the B anti-collision wall 21 and the outlet end of the No. 2 water pump 17. It is controlled by the control unit and can control the opening according to the control signal and feed back the opening state to the control unit.

[0085] The No. 6 control valve 18 is installed on the connecting pipe between the water outlet end of the B crash wall 21 and the inlet end of the No. 2 water pump 17. It is controlled by the control unit, can control the opening according to the control signal, and feed back the opening state to the control unit.

[0086] The seventh control valve 24 is installed on the connecting pipe between the water inlet end of the D anti-collision wall 22 and the outlet end of the second water pump 17, and is controlled by the control unit. It can control the opening according to the control signal and feed back the opening state to the control unit.

[0087] The No. 8 control valve 20 is installed on the connecting pipe between the water outlet end of the D anti-collision wall 22 and the inlet end of the No. 2 water pump 17. It is controlled by the control unit and can control the opening according to the control signal and feed back the opening state to the control unit.

[0088] The No. 9 control valve 8 is installed on the connecting pipe between the inlet end of the No. 1 water pump 6 and the water outside the ship. It is responsible for controlling the flow of external water to the No. 1 water pump 6. It is controlled by the control unit and can control the opening according to the control signal, and feed back the opening status to the control unit.

[0089] The No. 10 control valve 5 is installed on the connecting pipe between the outlet end of the No. 1 water pump 6 and the outside of the ship. It is responsible for controlling the flow of water from the outlet end of the No. 1 water pump 6 to the outside. It is controlled by the control unit and can control the opening according to the control signal, and feed back the opening state to the control unit.

[0090] The No. 11 control valve 19 is installed on the connecting pipe between the inlet end of the No. 2 water pump 17 and the water outside the ship. It is responsible for controlling the flow of external water to the No. 2 water pump 17. It is controlled by the control unit and can control the opening according to the control signal and feed back the opening status to the control unit.

[0091] Control valve No. 12 16 is installed on the connecting pipe between the outlet end of water pump No. 2 17 and the outside of the ship. It is responsible for controlling the flow of water from the outlet end of water pump No. 2 17 to the outside. It is controlled by the control unit and can control the opening according to the control signal and feed back the opening status to the control unit.

[0092] like Figure 1 As shown, there are four level gauges 3, and the respective installation structures are:

[0093] The liquid level meter 3 at A is installed at the bottom of the port bulkhead of the fish hold 1, and can measure the real-time liquid level of the port bulkhead and transmit it to the control unit.

[0094] The liquid level meter 3 at B is installed at the bottom of the front bulkhead of the fish hold 1, and can measure the real-time liquid level of the port bulkhead and transmit it to the control unit.

[0095] The liquid level meter 3 at C is installed at the bottom of the starboard bulkhead of the fish hold 1, and can measure the real-time liquid level of the port bulkhead and transmit it to the control unit.

[0096] The liquid level meter 3 at D is installed at the bottom of the rear bulkhead of the fish hold 1, and can measure the real-time liquid level of the port bulkhead and transmit it to the control unit.

[0097] The control unit is the centralized part for signal collection, calculation, and control command issuance of the system. It is connected to water pump No. 1 6, water pump No. 2 17, control valve No. 1 12, control valve No. 2 7, control valve No. 3 13, control valve No. 4 9, control valve No. 5 23, control valve No. 6 18, control valve No. 7 24, control valve No. 8 20, control valve No. 9 8, control valve No. 10 5, control valve No. 11 19, and control valve No. 12 16 through communication lines.

[0098] In actual working process:

[0099] The ship's pitch angle θ is defined as the ship's tilt angle along the length direction. When the bow is higher than the stern, the ship is trimmed by the stern, θ>0; when the bow is lower than the stern, the ship is trimmed by the bow, θ<0.

[0100] Ship roll angle It is defined as the tilt angle of the ship along the width of the ship. When the port side is higher than the starboard side, the ship tilts to the right. When the port side is lower than the starboard side, the ship lists to port.

[0101] (I) Initial state:

[0102] When a ship is sailing in calm waters, it is less affected by the outside world and is only affected by its own motion state. The pitch angle and roll angle change to a limited extent. The ship sails normally and the live fish in the fish hold survive safely. At this time, the control equation of the fish hold fish protection and anti-collision system is:

[0103]

[0104] Where t is a certain moment, and t-1 is the previous moment. ε is the pitch angle control parameter, which can be input into the system by the crew according to the actual situation; σ is the pitch angle control parameter, which can be input into the system by the crew according to the actual situation.

[0105] (ii) The vessel experiences a large pitching motion:

[0106] When a ship sails to a certain area, it is affected by the external wind, waves and currents, and the bow and stern of the ship shake up and down when it is pitching severely. The water in the fish hold is affected by inertia, and as the ship shakes longitudinally, the live fish in it shake with the water, and gradually the fish cannot avoid hitting the front and rear walls of the fish hold.

[0107] At this time, the ship's pitch angle changes dramatically, and the system control equation shows a single-phase change, as shown below.

[0108]

[0109] At the same time, in order to further judge the actual situation in the fish hold, when the control equation changes, the control unit reads the reading of the B level gauge installed on the bow bulkhead in the fish hold and the reading of the D level gauge installed on the stern bulkhead for verification. When the control system logic determines that the following control equation is established, the protection system is started.

[0110]

[0111] Where t is a certain moment, t-1 is the moment before that moment, LB is the real-time level reading of level gauge B (in mm), and LD is the real-time level reading of level gauge D (in mm).

[0112] The ship experienced a large pitch roll and the live fish in the fish hold were constantly pitched along with the water in the hold.

[0113] When LB<LD, the water level at the front bulkhead of the fish tank decreases, the water level at the rear bulkhead increases, and the water flows to the rear bulkhead. Open the control valve and start the No. 2 water pump. At the same time, open the No. 7 control valve to connect the D anti-collision belt to the anti-collision system. The outside water passes through the No. 1 control valve and, under the action of the No. 2 water pump, is sprayed into the rear wall of the fish tank from the various water spray ports on the D anti-collision belt to offset the shaking water in the tank and slow down the impact of the water in the tank and the fish on the rear bulkhead.

[0114] At the same time, due to the action of the No. 2 water pump, the water outside the ship enters the fish hold, and the water volume in the fish hold increases. At this time, the liquid level LA at the left bulkhead and the liquid level LC at the right bulkhead continue to increase. The No. 1 water pump is turned on, and the control valve No. 10 is opened. The No. 2 control valve is opened, and the A anti-collision belt outlet is connected to the No. 1 water pump inlet; the No. 4 control valve is opened, and the C anti-collision belt outlet is connected to the No. 1 water pump inlet. The No. 1 water pump draws water from the fish hold and discharges it outside the ship through the control valve to ensure the water balance in the fish hold.

[0115] As the ship's pitching cycle changes, when LB>LD, the water level at the front bulkhead of the fish hold rises, the water level at the rear bulkhead decreases, and the water flows to the front bulkhead. At this time, close the No. 7 control valve, close the D anti-collision belt, open the No. 5 control valve, and connect the B anti-collision belt to the anti-collision system. The outside water passes through the control valve and, under the action of the No. 2 water pump, is sprayed into the front wall of the fish hold from the various water spray ports on the B anti-collision belt, and offsets the shaking water in the hold to slow down the impact of the water in the hold and the fish on the front bulkhead.

[0116] At the same time, due to the action of the No. 2 water pump, the water outside the ship enters the fish hold, and the water volume in the fish hold increases. At this time, the liquid level LA at the left bulkhead and the liquid level LC at the right bulkhead continue to increase. The No. 1 water pump is turned on, and the control valve No. 10 is opened. The No. 2 control valve is opened, and the A anti-collision belt outlet is connected to the No. 1 water pump inlet; the No. 4 control valve is opened, and the C anti-collision belt outlet is connected to the No. 1 water pump inlet. The No. 1 water pump draws water from the fish hold and discharges it outside the ship through the control valve to ensure the water balance in the fish hold.

[0117] When the ship gradually calms down, the following control equation holds true:

[0118]

[0119] The control unit controls all executed water pumps and valves to close. This round of control ends.

[0120] (III) The ship experiences a large roll:

[0121] When a ship sails to a certain area, it is affected by the external wind, waves and currents, and the ship rolls severely. The water in the fish hold is affected by inertia. As the ship rolls horizontally, the live fish in the fish hold sways with the water, and gradually the fish cannot avoid hitting the left and right bulkheads of the fish hold.

[0122] At this time, the ship's roll angle changes dramatically, and the system control equation shows a single-phase change, as shown below.

[0123]

[0124] At the same time, in order to further judge the actual situation in the fish hold, when the control equation changes, the control unit reads the reading of the A level gauge installed on the left bulkhead in the fish hold and the reading of the C level gauge installed on the right bulkhead for verification. When the control system logic determines that the following control equation is established, the protection system is started.

[0125]

[0126] Where t is a certain moment, t-1 is the moment before that moment, LA is the real-time level reading of level gauge A (in mm), and LC is the real-time level reading of level gauge C (in mm).

[0127] The ship experienced a large pitch roll and the live fish in the fish hold were constantly pitched along with the water in the hold.

[0128] When LA<LC, the water level at the left bulkhead of the fish tank decreases, the water level at the right bulkhead increases, and the water flows to the right bulkhead. Open the No. 9 control valve and start the No. 1 water pump. At the same time, open the No. 3 control valve to connect the C anti-collision belt to the anti-collision system. The outside water passes through the No. 9 control valve and, under the action of the No. 1 water pump, is sprayed into the right wall of the fish tank from the various water spray ports on the C anti-collision belt, counteracting the shaking water in the tank and slowing down the impact of the water in the tank and the fish on the right bulkhead.

[0129] At the same time, due to the action of the No. 1 water pump, the water outside the ship enters the fish hold, and the water volume in the fish hold increases. At this time, the liquid level LB at the front bulkhead and the liquid level LD at the right bulkhead continue to increase. The No. 2 water pump is turned on, and the control valve No. 1 2 is opened. The No. 6 control valve is opened to connect the B anti-collision belt outlet to the No. 2 water pump inlet; the No. 8 control valve is opened to connect the D anti-collision belt outlet to the No. 2 water pump inlet. The No. 2 water pump draws water from the fish hold and discharges it outside the ship through the control valve to ensure the balance of water volume in the fish hold.

[0130] As the ship's pitching cycle changes, when LA>LC, the water level at the left bulkhead of the fish hold rises, the water level at the right bulkhead decreases, and the water flows to the left bulkhead. At this time, close the No. 3 control valve, close the C anti-collision belt, open the No. 1 control valve, and connect the A anti-collision belt to the anti-collision system. External water passes through the No. 9 control valve and, under the action of the No. 1 water pump, is sprayed into the left bulkhead of the fish hold from the various water spray ports on the A anti-collision belt, counteracting the shaking water in the hold to slow down the impact of the water in the hold and the fish on the left bulkhead.

[0131] At the same time, due to the action of the No. 1 water pump, the water outside the ship enters the fish hold, and the water volume in the fish hold increases. At this time, the liquid level LB at the front bulkhead and the liquid level LC at the rear bulkhead continue to increase. The No. 2 water pump is turned on, and the control valve No. 1 2 is opened. The No. 6 control valve is opened to connect the B anti-collision belt outlet to the No. 2 water pump inlet; the No. 8 control valve is opened to connect the D anti-collision belt outlet to the No. 2 water pump inlet. The No. 2 water pump draws water from the fish hold and discharges it outside the ship through the control valve to ensure the water balance in the fish hold.

[0132] When the ship gradually calms down, the following control equation holds true:

[0133]

[0134] The control unit controls all executed water pumps and valves to close. This round of control ends.

[0135] (IV) The ship experiences pitch and roll coupling shaking:

[0136] When a ship sails to a certain area, it is affected by the external wind, waves and currents, and there are more serious rolls and pitches, causing the ship to sway forward and backward and left and right. The water in the fish hold is affected by inertia, and as the ship sways in all directions, the live fish in it sways with the water, and gradually the fish cannot avoid hitting the walls of the fish hold.

[0137] At this time, the ship's roll angle changes dramatically, and the system control equation shows a two-phase change, as follows.

[0138]

[0139] At the same time, in order to further judge the actual situation in the fish hold, when the control equation changes, the control unit reads the reading of the A level gauge installed on the left bulkhead in the fish hold, the reading of the C level gauge installed on the right bulkhead, the reading of the B level gauge installed on the bow bulkhead in the fish hold, and the reading of the D level gauge installed on the stern bulkhead for verification. When the control system logic determines that the following control equation is established, the protection system is started.

[0140]

[0141] Where t is a certain moment, and t-1 is the moment before that moment. LA is the real-time liquid level reading of level gauge A (in mm), LC is the real-time liquid level reading of level gauge C (in mm), LB is the real-time liquid level reading of level gauge B (in mm), and LD is the real-time liquid level reading of level gauge D (in mm).

[0142] The ship experienced large pitch and roll movements, and the live fish in the fish hold were constantly pitched and rolled along with the water in the hold.

[0143] The No. 9 control valve is opened, the No. 1 water pump is started, the No. 1 control valve and the No. 3 control valve are opened, and the outside water continuously enters the fish tank through the A anti-collision belt and the C anti-collision belt;

[0144] At the same time, the control valve is opened, the No. 2 water pump is started, the No. 5 control valve and the No. 7 control valve are opened, and the outside water continuously enters the fish tank through the B anti-collision belt and the D anti-collision belt.

[0145] As the outside water continues to enter the fish tank, the fish tank is filled with water in a short time. The real-time readings of the A level gauge, B level gauge, C level gauge, and D level gauge LA, LB, LC, and LD reach the set maximum value. Close the No. 1 control valve, No. 3 control valve, No. 5 control valve, No. 7 control valve, No. 9 control valve, No. 10 control valve, No. 11 water pump, and No. 12 water pump.

[0146] At the same time, the fish tank is full of water, and the shaking is limited, but the fish still shakes with the shaking of the ship. At this time, the No. 2 control valve, the No. 4 control valve, the No. 6 control valve, and the No. 8 control valve are opened at the same time.

[0147] The No. 1 water pump is started to pump water from the A anti-collision belt through the No. 2 control valve and from the C anti-collision belt through the No. 4 control valve. The No. 1 and No. 3 control valves are opened to spray the water pumped by the No. 1 water pump evenly from the A anti-collision belt and the C anti-collision belt into the cabin, forming elastic damping of the left and right bulkheads, slowing down the swaying in the cabin in the ship width direction and reducing the roll amplitude.

[0148] The No. 2 water pump is started to pump water from the B anti-collision belt through the No. 6 control valve and from the D anti-collision belt through the No. 8 control valve. The No. 5 and No. 7 control valves are opened to spray the water pumped by the No. 2 water pump evenly from the B anti-collision belt and the D anti-collision belt into the cabin, forming elastic damping of the front and rear bulkheads, slowing down the swaying in the cabin in the direction of the ship's length and reducing the pitch amplitude.

[0149] When the ship gradually calms down, the following control equation no longer holds true:

[0150]

[0151] The pitch and roll coupled motion is converted into roll or pitch, and the control unit switches the system to roll control or pitch control according to the control equation until the control ends.

[0152] The above description is an explanation of the present invention, not a limitation of the present invention. The scope of the present invention is defined in the claims. Any form of modification may be made within the scope of protection of the present invention.

Claims

1. A live fish tank fish protection system specially used in complex sea conditions, characterized by: The invention comprises a fish hold (1) for storing live fish on a fishing vessel, wherein the inner wall surface of the fish hold (1) is respectively provided with a crash barrier body (2), each crash barrier body (2) having the same structure, and two crash barrier bodies (2) on opposite sides correspond to and are connected to each other, and the structure of a single crash barrier body (2) comprises crash bars (201) distributed in sequence from top to bottom, the crash bars (201) are arranged along the bulkhead, all the crash bars (201) are interconnected, and each crash barrier (201) is provided with uniformly distributed injection ports (202); a fish protection system is provided between the two crash barrier bodies (2) on opposite sides, and the structure of a single fish protection system comprises a water pump, wherein two ends of the water pump are respectively connected to the water outside the ship and the discharge port, and at the same time, the two ends of the water pump are connected in parallel to the crash barrier body (2) through a control valve.

2. A live fish tank fish protection system specially used in complex sea conditions as claimed in claim 1, characterized in that: The fish hold (1) adopts a tetrahedral structure.

3. A live fish tank fish protection system specially used in complex sea conditions as claimed in claim 1, characterized in that: The four surfaces of the fish hold (1) are marked A, B, C, and D in a clockwise direction. The A anti-collision wall (10) is installed at A, the B anti-collision wall (21) is installed at B, the C anti-collision wall (11) is installed at C, and the D anti-collision wall (22) is installed at D.

4. A live fish tank fish protection system specially used in complex sea conditions as claimed in claim 1, characterized in that: Liquid level meters (3) are respectively installed on the four surfaces of the fish tank (1).

5. A live fish tank fish protection system specially used in complex sea conditions as claimed in claim 1, characterized in that: The injection port (202) is in a square or circular shape.

6. A method for a live fish tank fish protection system specifically used in complex sea conditions as claimed in claim 1, characterized in that: The work process includes the following: Initial state: When a ship is sailing in calm waters, it is less affected by the outside world and is only affected by its own motion state. The pitch angle and roll angle change to a limited extent. The ship sails normally and the live fish in the fish hold (1) survive safely. At this time, the control equation of the fish hold fish protection and anti-collision system is: Among them, t is a certain moment, t-1 is the moment before this moment, ε is the pitch angle control parameter, which can be input into the system by the crew according to the actual situation; σ is the pitch angle control parameter, which can be input into the system by the crew according to the actual situation; The ship experiences a large pitching motion: When the ship pitches, the bow and stern of the ship shake up and down, and the water in the fish hold (1) is affected by inertia. As the ship pitches, the live fish shake along with the water, and gradually the fish are unable to avoid hitting the front and rear walls of the fish hold. At this time, the ship's pitch angle changes violently, and the system control equation shows a single-phase change, as follows: The ship experiences a large roll: When a ship sails to a certain water area, it is affected by external wind, waves and currents, and a relatively serious roll occurs. The ship sways left and right, and the water in the fish hold (1) is affected by inertia. As the ship sways laterally, the live fish in the fish hold sways along with the water, and gradually the fish cannot avoid hitting the left and right bulkheads of the fish hold. At this time, the ship's rolling angle changes violently, and the system control equation shows a single-phase change, as follows: The ship experiences pitch and roll coupling shaking: When a ship sails to a certain water area, it is affected by external wind, waves and currents, and there are severe rolls and pitches. The ship sways front and back, left and right, and the water in the fish hold is affected by inertia. As the ship sways in all directions, the live fish in it sways with the water, and gradually the fish are unable to avoid and hit the walls of the fish hold. At this time, the ship's roll angle changes dramatically, and the system control equation shows a two-phase change, as follows:

7. A method for a live fish tank fish protection system specifically used in complex sea conditions as claimed in claim 6, characterized in that: The anti-collision wall bodies (2) on the four sides of the fish hold (1) are defined as: A anti-collision wall (10), B anti-collision wall (21), C anti-collision wall (11), and D anti-collision wall (22), and the liquid level gauges (3) installed at the respective anti-collision walls are: A liquid level gauge, B liquid level gauge, C liquid level gauge, and D liquid level gauge; When the ship is experiencing a large pitching, in order to further determine the actual situation in the fish hold (1), while the control equation is changing, the control unit reads the reading of the B level gauge installed on the bow bulkhead in the fish hold and the reading of the D level gauge installed on the stern bulkhead for verification. When the control system logic determines that the following control equation is established, the protection system is activated; Among them, t is a certain moment, t-1 is the previous moment, LB is the real-time liquid level reading of level gauge B (in mm), and LD is the real-time liquid level reading of level gauge D (in mm).

8. A method for a live fish tank fish protection system specifically used in complex sea conditions as claimed in claim 7, characterized in that: The ship pitches heavily, and the live fish in the fish hold (1) pitch continuously along with the water in the hold; When LB is less than LD, the water level at the front bulkhead of the fish hold decreases, while the water level at the rear bulkhead increases, and water flows toward the rear bulkhead, so that the D anti-collision wall (22) is connected to the anti-collision system, and water is sprayed from the various spray ports on the D anti-collision wall (22) into the rear wall of the fish hold (1), thereby offsetting the shaking water in the hold and slowing down the collision of the water in the hold and the fish against the rear bulkhead; As the pitching cycle of the ship changes, when LB>LD, the water level at the front bulkhead of the fish hold rises, and the water level at the rear bulkhead decreases, and water flows to the front bulkhead, connecting the B anti-collision wall (21) to the anti-collision system, and spraying water from the various spray ports on the B anti-collision wall (21) into the front wall of the fish hold, counteracting the shaking water in the hold and slowing down the collision of the water in the hold and the fish against the front bulkhead; At the same time, due to the action of the water pump, the water outside the ship enters the fish hold, and the water volume in the fish hold increases. At this time, the liquid level LA at the left bulkhead and the liquid level LC at the right bulkhead continue to increase. The water volume in the fish hold is balanced through the action of the water pump and the control valve. When the ship gradually calms down, the following control equation holds true: The control unit controls all executed water pumps and valves to close, and this round of control ends.

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