Truss structure for catching euphausia superba

Abstract

The invention provides a truss structure for catching euphausia superba. The truss structure comprises a truss, a stay cable group, a truss rotating shaft, a truss pushing device, a front end fastening device, a rear end fastening device and a top end fastening device, the truss is used for hanging the trawl tackle, so that the trawl steel wire rope penetrates through the trawl tackle to pull the underwater netting gear; the truss is rotationally connected with a ship end through a truss rotating shaft; the truss pushing device is used for pushing the truss to be converted into a horizontal unfolding state; the outer end part of the truss is rotatably connected with a ship end through a stay cable group, a front end fastening device, a rear end fastening device and a top end fastening device; under the action of the stay cable set, the front end fastening device, the rear end fastening device and the top end fastening device, the outer end of the truss rotates in the three-dimensional direction through three-point fastening. The truss structure provides supporting force for the ends of the trusses through three-point fastening, so that the trusses bear trawl pulling force, the cost is reduced, the use space of a ship is enlarged, and manpower is saved; and the multi-angle folding and unfolding function can be achieved, and the applicability of the truss is improved.

Description

Technical Field

[0001] The invention relates to the technical field of marine fishing equipment, and in particular to a truss structure used for Antarctic krill fishing. Background Art

[0002] Antarctic krill, as the largest biological population on Earth today, has become a marine resource that countries are competing to obtain. Fishing vessels are the only equipment for taking in krill, which has gradually developed from traditional trawling to today's truss trawling continuous pump suction fishing method. In this fishing method, the truss plays a role in bearing the trawling force, adapting to the ship's posture, and adjusting the distance between the ship and the net.

[0003] Because the special mechanical equipment required for truss operation, such as winches and hydraulic cylinders, is relatively complex, occupies ship space, is complex to operate, and has low equipment utilization, all ships currently in use use unidirectional truss deployment and retraction, that is, horizontal or vertical direction, and the angle cannot be adjusted, which limits the function of the truss and the diversity of operations it can adapt to. Based on this, the present invention proposes a new truss structure for Antarctic krill fishing. Summary of the invention

[0004] Based on the above description, the present invention provides a truss structure for Antarctic krill fishing to solve the problem that the ship in the prior art adopts a one-way truss that can be retracted and extended and the angle cannot be adjusted, which limits the function of the truss and the diversity of operations it can adapt to.

[0005] The technical solution of the present invention to solve the above technical problems is as follows: The present invention provides a truss structure for Antarctic krill fishing, comprising: a truss, a stay cable group, a truss rotating shaft, a truss jacking device, a front end fastening device, a rear end fastening device and a top end fastening device; The truss is used to suspend the trawl block, so that the trawl wire rope passes through the trawl block to pull the underwater net; One end of the truss is rotatably connected to the end of the ship through the truss rotation axis; the truss pushing device is used to push the truss from a vertical state to a horizontally unfolded state; The outer end of the truss is rotatably connected to the ship end through the inclined cable group and the front end fastening device, the rear end fastening device and the top end fastening device; under the action of the inclined cable group, the front end fastening device, the rear end fastening device and the top end fastening device, the outer end of the truss can be rotated in three dimensions through three-point fastening.

[0006] Based on the above technical solution, the present invention can also be improved as follows.

[0007] Further, the stay cable group includes a front end stay cable, a rear end stay cable and a top end stay cable; The front end inclined cable, the rear end inclined cable and the top end inclined cable are respectively connected to the outer end of the truss at an angle of 45 degrees to decompose the trawl tension below the outer end of the truss in the three directions in which the inclined cables extend.

[0008] Further, the front end of the truss is connected to the ship end at a first angle through the front end inclined cable and the front end fastening device; The rear end of the truss is connected to the ship end at a second angle through the rear end inclined cable and the rear end fastening device; The top end of the truss is connected to the ship end at a third angle through the top end inclined cable and the top end fastening device.

[0009] Furthermore, the truss rotation axis is a cross-shaped bidirectional rotation axis, and the truss can perform multi-directional rotation around the cross-shaped bidirectional rotation axis so that the truss can rotate horizontally and / or vertically.

[0010] Further, the truss rotation axis includes a horizontal rotation axis and a vertical rotation axis; Therefore, the horizontal rotation axis and the vertical rotation axis are arranged in a cross shape.

[0011] Further, the truss pushing device includes a ball-head hydraulic pushing cylinder; The pushing portion of the truss pushing device is in spherical contact with the truss. Under the action of the ball head hydraulic pushing cylinder, the truss can be gradually unfolded and pulled open to a target angle under the traction of the front end fastening device.

[0012] Furthermore, utilizing the principle of moment balance, the moment generated between the cylinder pushing point of the ball head hydraulic pushing cylinder and the horizontal rotation axis is defined as M1; the static friction moment M2 of the truss at the horizontal rotation axis is defined; when M1>M2, the truss can be horizontally unfolded under the pushing force. Furthermore, the top fastening device is provided with a vertical adjustment cable, with the vertical rotation axis as the origin, the distance between the fixed point of the vertical adjustment cable on the truss and the origin is defined as R0, and the two ends of the vertical adjustment cable are fixed pulleys, and the adjustment distance L between the two is b , the truss length is R; When the top inclined cable is set at 45° with the outer end of the truss, the length of the vertical adjustment cable is L a , and the distance L between the fixed pulley group n is adjusted b The relationship is La = n × L b .

[0013] Furthermore, when L a When the maximum value is reached, L b=L a / n=R / n; The vertical adjustable travel of the truss is L=L b ×R / R0=R² / (n×R0).

[0014] Furthermore, the arc length S of the truss when rotating about the vertical rotation axis and the vertical adjustment angle α of the truss are defined, then the vertical adjustable stroke of the truss is L=S=α×R, α=L / R=R / (n×R0).

[0015] Compared with the prior art, the truss structure for Antarctic krill fishing provided by the present invention has the following beneficial technical effects: (1) The truss structure provided by the present invention provides sufficient support force to the truss end through three-point fastening, so that it can bear the pulling force of the trawl. After each fastening point is fixed, no special winch or manual maintenance is required, which reduces costs, expands the use space of the ship, and saves manpower.

[0016] (2) The rotation of the truss structure provided by the present invention fundamentally relies on the truss rotation axis, so that the truss has horizontal and vertical rotation. Through the operation of the three-point fastening link, the truss can be rotated in multiple directions. By adjusting the retraction and extension length of each operating rope, the multi-angle retraction and extension function is realized, thereby improving the applicability of the truss and reflecting the diversity of the truss's functional performance and adaptability to operations.

[0017] (3) The truss structure provided by the present invention includes a truss pushing device. The pushing portion has no rigid connection with the truss. In the process of pushing the truss open, only a short hydraulic stroke is required to pull the truss open to a certain angle, and the truss is gradually unfolded by the front end fastening rope, so that the truss does not require hydraulic support during the unfolding and fixing process, thereby reducing connecting parts and improving operation safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 A schematic diagram of a top view of a truss structure for Antarctic krill fishing provided by an embodiment of the present invention; Figure 2 A schematic diagram of the main structure of a truss structure for Antarctic krill fishing provided by an embodiment of the present invention; Figure 3 A schematic structural diagram of a stay cable assembly provided in an embodiment of the present invention; Figure 4A schematic diagram of the structure of a truss rotation axis provided by an embodiment of the present invention; Figure 5 A schematic diagram of the structure of a front end fastening device provided by an embodiment of the present invention; Figure 6 A schematic diagram of the structure of a rear end fastening device provided by an embodiment of the present invention; Figure 7 A schematic diagram of the structure of a top end fastening device provided by an embodiment of the present invention; In the accompanying drawings, the components represented by the reference numerals are listed as follows: 1. Truss; 2. Cable group; 21. Front cable; 22. Rear cable; 23. Top cable; 3. Truss rotation axis; 31. Horizontal rotation axis; 32. Vertical rotation axis; 4. Truss pushing device; 5. Front end fastening device; 51. Front end inclined index rope; 52. Traction part; 53. Fixing part; 6. Rear end securing device; 61. Rear end inclined indexing cable; 7. Top fastening device; 71. Vertical adjustment rope; 72. Vertical adjustment index rope; 73. Guide pulley; 74. Fixing device. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0022] In the description of the embodiments of the present invention, the terms “first”, “second” and “third” are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0023] The following is combined with Figures 1 to 7The embodiments of the present invention are further described in detail with examples. The following examples are used to illustrate the present invention but cannot be used to limit the scope of the present invention.

[0024] The truss structure for Antarctic krill fishing provided by the present invention is as follows: Figure 1 and Figure 2 As shown, it includes: a truss 1, a cable group 2, a truss rotation axis 3, a truss pushing device 4, a front end fastening device 5, a rear end fastening device 6 and a top end fastening device 7.

[0025] The truss 1 is used to suspend the trawl block so that the trawl wire rope passes through the trawl block to pull the underwater net.

[0026] One end of the truss 1 is rotatably connected to the end of the ship through a truss rotation shaft 3; the truss pushing device 4 is used to push the truss 1 from a vertical state to a horizontally unfolded state.

[0027] The outer end of the truss 1 is rotatably connected to the end of the ship through the inclined cable group 2 and the front end fastening device 5, the rear end fastening device 6 and the top end fastening device 7; under the action of the inclined cable group 2, the front end fastening device 5, the rear end fastening device 6 and the top end fastening device 7, the outer end of the truss 1 can be rotated in three dimensions through three-point fastening.

[0028] Among them, Figure 3 As shown, the stay cable group 2 includes a front end stay cable 21 , a rear end stay cable 22 and a top end stay cable 23 .

[0029] The front end inclined cable 21, the rear end inclined cable 22 and the top end inclined cable 23 are respectively connected to the outer end of the truss 1 at an angle of 45 degrees to decompose the trawl tension below the outer end of the truss 1 in the three directions in which the inclined cables extend.

[0030] Specifically, the front end of the truss 1 is connected to the end of the ship at a first angle through the front end inclined cable 21 and the front end fastening device 5.

[0031] The rear end of the truss 1 is connected to the ship end at a second angle through the rear end inclined cable 22 and the rear end fastening device 6.

[0032] The top end of the truss 1 is connected to the end of the ship at a third angle through the top inclined cable 23 and the top fastening device 7.

[0033] The above-mentioned first angle, second angle and third angle are not specifically limited here and can be set accordingly according to actual conditions. They are not used as limitations on the protection scope. Any settings that can achieve the tensioning function can fall within the protection scope of this application.

[0034] In a specific example, the outer end of the truss 1 is connected to the front end inclined cable 21 and the rear end inclined cable 22 through a shackle and an eye plate in the horizontal direction, and the upper end in the vertical direction is connected to the top end inclined cable 23 and the vertical adjustment cable 71 through a shackle, such as Figure 3 As shown, the front end inclined cable 21, the rear end inclined cable 22, and the top end inclined cable 23 are connected to the outer end of the truss 1 at an angle of 45 degrees, and the trawl tension at the lower part of the outer end of the truss 1 is decomposed in three directions. There is no restriction on the connection point of the vertical inclined cable on the truss 1. Multi-plate pulleys are installed at both ends of the inclined cable, and each is fixed to the end of the truss 1 and the ship end through a shackle to form a multi-plate fixed pulley block, in which the multi-plate pulley at the ship end is provided with a rope fixed end. The vertical adjustment cable 71 passes through the winding of the pulley block and is wound from the top to the free end to the ship platform, thereby reducing the tension of the vertical adjustment of the truss 1. According to the number of pulley plates n, the tension of the vertical inclined cable at the ship end is .

[0035] Furthermore, if Figure 5 As shown, the front end fastening device 5 is installed at the ship end, and the front end inclined pulley 51 of the truss 1 passes through the traction part 52 - the pulley shackle. The pulley shackle is a shackle pin with a pulley, and the pulley groove depth matches the pulley diameter; the number of chain links can be adjusted, and its total length can be approximately calculated as the arc length S required for the horizontal expansion adjustment position of the truss 1. When the length L of the truss 1 (starting from the horizontal rotation axis 31) is known, the horizontal adjustable angle of the truss 1 can be obtained according to α=S / L (α is the angle between the transverse vertical line of the center line of the ship and the center line of the truss 1).

[0036] Under the pulling action of the auxiliary winch, the front end inclined cable 51 selects the nth chain link of the fixing part 53 and fixes it with the ship shackle according to the actual required horizontal angle of the truss 1. The auxiliary winch is disconnected from the cable and other operations can be carried out. At this time, the front end supporting force of the truss 1 is borne by the front end inclined cable 21-chain link-shackle-eye plate, thereby realizing the fixation of the front end of the truss and the setting of the horizontal angle.

[0037] like Figure 6 As shown, the rear end fastening device 6 comprises a rear end inclined pull index cable 61, and the rear end inclined pull index cable 61 is connected to the rear end inclined pull cable 22 through the ship cable hole.

[0038] In an optional embodiment, if Figure 4 As shown, the truss rotation axis 3 is a cross-bidirectional rotation axis, and the truss 1 can perform multi-directional rotation around the cross-bidirectional rotation axis to enable the truss 1 to rotate horizontally and / or vertically.

[0039] Specifically, the truss rotation axis 3 includes a horizontal rotation axis 31 and a vertical rotation axis 32 ; the horizontal rotation axis 31 and the vertical rotation axis 32 are arranged in a cross shape.

[0040] In an optional embodiment, the truss pushing device 4 includes a ball-head hydraulic pushing cylinder.

[0041] The pushing portion of the truss pushing device 4 is in spherical contact with the truss 1. Under the action of the ball head hydraulic pushing cylinder, the truss 1 can be gradually unfolded and pulled open to the target angle under the traction of the front end fastening device 5.

[0042] By using the principle of moment balance, the moment generated between the cylinder pushing point of the ball head hydraulic pushing cylinder and the horizontal rotation axis 31 is defined as M1; the static friction moment M2 of the truss 1 at the horizontal rotation axis 31 is defined; when M1>M2, the truss 1 can be horizontally unfolded under the pushing force.

[0043] Specifically, the truss pushing device 4 is a ball head hydraulic pushing cylinder, the ball head is in contact with the truss 1, and there is no rigid connection. The cylinder pushing point can be freely set. Using the moment balance principle, the moment M1 generated between the cylinder pushing point and the horizontal rotation axis 31 of the truss 1, the deadweight G0 of the truss 1, and the horizontal deadweight G1 of the truss 1 considering the ship roll angle θ, then the horizontal deadweight G1 of the truss 1 = G0 × sinθ, the steel-steel friction coefficient μ is introduced, and the distance r (i.e. the radius of the contact circle) from the contact surface of the horizontal rotation axis 31 to the axis center is considered. According to the formula M2 = μ × G1 × r, the static friction moment M2 at the horizontal rotation axis 31 of the truss 1 can be obtained. At this point, taking M1>M2 can give the cylinder thrust, so that the truss 1 can be horizontally unfolded under the pushing force.

[0044] like Figure 7 As shown, the top fastening device 7 is installed on the ship end through the fixing device 74, and the vertical adjustment index rope 72 passes by the guide pulley 73 and can be pulled by the auxiliary winch to adjust the vertical angle of the truss. When the angle is appropriate, the end of the adjustment rope is connected to the fixed buckle at the ship end, and the auxiliary winch is detached to fix it.

[0045] The top fastening device 7 is provided with a vertical adjustment cable 71. With the vertical rotation axis 32 as the origin, the distance between the fixed point of the vertical adjustment cable on the truss 1 and the origin is defined as R0. The two ends of the vertical adjustment cable are fixed pulleys, and the adjustment distance between the two is L b , the length of truss 1 is R; When the top inclined cable 23 is set at 45° with the outer end of the truss 1, the travel length of the vertical adjustment cable 71 is L a , adjust the distance L between the fixed pulley block n b The relationship is La = n × L b .

[0046] When L a When the maximum value is reached, L b =L a / n=R / n; The vertical adjustable travel of the truss 1 is L=L b×R / R0=R² / (n×R0).

[0047] Define the arc length S of the truss 1 when it rotates about the vertical rotation axis 32, and the vertical adjustment angle α of the truss 1, then the vertical adjustable stroke of the truss 1 is L=S=α×R, α=L / R=R / (n×R0).

[0048] In a specific example, the operation process of the above truss structure in actual operation is as follows: (1) The front end of the truss is connected through the pulley shackle; (2) When the auxiliary winch pulls the guide rope, the central processing system selects the chain ring and the ship's shackle to fix it according to the actual horizontal and vertical angles required by the truss; (3) The auxiliary winch is disconnected from the guide rope and other operations can be carried out; (4) The rear end inclined indexing cable is pulled by an auxiliary winch; (5) The chain ring is connected to the front end buckle of the adjusting screw, and the adjusting screw is adjusted to fine-tune the length or not adjusted, and the auxiliary winch is disengaged; (6) Horizontal adjustment and fixing of the truss are completed; (7) Vertically adjust the index rope to pass around the guide pulley; (8) Use the auxiliary winch to pull, and when the angle is appropriate, adjust the end of the rope to connect it to the fixed shackle at the ship end; (9) Disengage the auxiliary winch to secure the device; (10) The vertical adjustment and fixation of the truss are completed.

[0049] In summary, the truss structure for Antarctic krill fishing provided by the embodiment of the present invention has the following advantages: (1) Through the three-point fastening method, sufficient support force is provided to the end of the beam to enable it to bear the pulling force of the trawl. After each fastening point is fixed, no special winch or manual maintenance is required, which reduces costs, expands the use space of the ship, and saves manpower.

[0050] (2) The rotation of the truss structure provided by the present invention is fundamentally dependent on the truss rotation axis, so that the truss has horizontal and vertical rotation, and through the operation of the three-point fastening link, the truss can be rotated in multiple directions. By adjusting the retraction and extension length of each operating rope, the multi-angle retraction and extension function is realized, thereby improving the applicability of the truss and reflecting the diversity of the functions of the truss 1 and the adaptability to operations.

[0051] (3) The truss pushing device is a hydraulic pushing device, and the pushing part and the truss adopt spherical contact without rigid connection; in the process of pushing the truss, only a short hydraulic stroke is required to pull the truss 1 to a certain angle, and the front end fastening rope is gradually unfolded, so that the truss does not need hydraulic support during the unfolding and fixing process, reducing the connection parts and improving the operation safety.

[0052] In the description of this specification, the description with reference to the terms "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are contradictory.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A truss structure for Antarctic krill fishing, characterized in that: include: Trusses, stay cables, truss rotation axes, truss jacking devices, front end fastening devices, rear end fastening devices and top end fastening devices; The truss is used to suspend the trawl block, so that the trawl wire rope passes through the trawl block to pull the underwater net; One end of the truss is rotatably connected to the end of the ship through the truss rotation axis; the truss pushing device is used to push the truss from a vertical state to a horizontally unfolded state; The outer end of the truss is rotatably connected to the ship end through the inclined cable group and the front end fastening device, the rear end fastening device and the top end fastening device; under the action of the inclined cable group, the front end fastening device, the rear end fastening device and the top end fastening device, the outer end of the truss can be rotated in three dimensions through three-point fastening.

2. The truss structure for Antarctic krill fishing according to claim 1, characterized in that: The stay cable group includes a front end stay cable, a rear end stay cable and a top end stay cable; The front end inclined cable, the rear end inclined cable and the top end inclined cable are respectively connected to the outer end of the truss at an angle of 45 degrees to decompose the trawl tension below the outer end of the truss in the three directions in which the inclined cables extend.

3. The truss structure for Antarctic krill fishing according to claim 2, characterized in that: The front end of the truss is connected to the ship end at a first angle through the front end inclined cable and the front end fastening device; The rear end of the truss is connected to the ship end at a second angle through the rear end inclined cable and the rear end fastening device; The top end of the truss is connected to the ship end at a third angle through the top end inclined cable and the top end fastening device.

4. The truss structure for Antarctic krill fishing according to claim 1, characterized in that: The truss rotation axis is a cross-shaped bidirectional rotation axis, and the truss can perform multi-directional rotation around the cross-shaped bidirectional rotation axis so that the truss can rotate horizontally and / or vertically.

5. The truss structure for Antarctic krill fishing according to claim 4, characterized in that: The truss rotation axis includes a horizontal rotation axis and a vertical rotation axis; Therefore, the horizontal rotation axis and the vertical rotation axis are arranged in a cross shape.

6. The truss structure for Antarctic krill fishing according to claim 5, characterized in that: The truss pushing device comprises a ball-head hydraulic pushing cylinder; The pushing portion of the truss pushing device is in spherical contact with the truss. Under the action of the ball head hydraulic pushing cylinder, the truss can be gradually unfolded and pulled open to a target angle under the traction of the front end fastening device.

7. The truss structure for Antarctic krill fishing according to claim 6, characterized in that: Using the principle of moment balance, the moment generated between the oil cylinder pushing point of the ball head hydraulic pushing oil cylinder and the horizontal rotation axis is defined as M1; Define the static friction moment M2 of the truss at the horizontal rotation axis; In the case of M1>M2, the truss can be horizontally unfolded under the jacking force.

8. The truss structure for Antarctic krill fishing according to claim 5, characterized in that: The top fastening device is provided with a vertical adjustment cable. With the vertical rotation axis as the origin, the distance between the fixed point of the vertical adjustment cable on the truss and the origin is defined as R0. The two ends of the vertical adjustment cable are fixed pulley blocks, and the adjustment distance between the two is L b , the truss length is R; When the top inclined cable is set at 45° with the outer end of the truss, the length of the vertical adjustment cable is L a , and the distance L between the fixed pulley group n is adjusted b The relationship is La = n × L b .

9. The truss structure for Antarctic krill fishing according to claim 8, characterized in that: When L a When the maximum value is reached, L b =L a / n=R / n; The vertical adjustable travel of the truss is L=L b ×R / R0=R² / (n×R0).

10. The truss structure for Antarctic krill fishing according to claim 9, characterized in that: Define the arc length S of the truss when it rotates about the vertical rotation axis, and the vertical adjustment angle α of the truss, then the vertical adjustable stroke of the truss is L=S=α×R, α=L / R=R / (n×R0).

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