Fishing boat trawl with quickly detachable net bag

Abstract

The invention relates to the field of fisheries, and in particular to a fishing vessel trawl with a quickly detachable net bag, comprising a trawl main body and a net bag, wherein the trawl main body is connected to a ship, the tail of the trawl main body is provided with an opening, and arc-shaped support rods are provided on both sides of the opening at the tail of the trawl main body, the net bag is arranged at the tail of the trawl main body, the net body of the net bag passes through the tail opening of the trawl main body and extends outward, the net mouth edge of the net bag is arranged on the arc-shaped support rods, and also comprises a separation and pulling device for pulling the net bag out of the trawl main body separately, the separation and pulling device comprises a traction rope, a closing mechanism and a locking mechanism, and the present application uses the setting that the net bag can be separated from the trawl main body separately, so that the fish in the net bag can be conveniently pulled out to the ship, and due to the setting of the closing mechanism and the locking mechanism, the net mouth of the net bag is more tightly closed when it is pulled out, thereby improving the tightness of the closing of the net bag, and ensuring that the fish school is smoothly escaped.

Description

Technical Field

[0001] The invention relates to the field of fisheries, in particular to a fishing vessel trawl with a quickly detachable net bag. Background Art

[0002] The operating principle of trawling is that a ship drags a bag-type fishing net through the sea area through which it passes. There is a problem with trawling, that is, the long-term dragging of the trawl will increase the burden on the net bag, and will cause the catch in the net bag to be squeezed and damaged, resulting in fish injury or death. Multiple bags are used to be detached one by one to reduce the dragging time of each net bag to alleviate this problem. However, the catch entering the trawl is not well distinguishable, that is, fish, shrimps, crabs, etc., regardless of size, are usually dragged into the net bag where the trawl passes. The trawler moves forward by dragging the trawl in the sea, so that the fish enters the net bag at the rear of the trawl. The trawl is usually large. In order to facilitate the movement of the fish entering the net bag to the fishing boat, some trawl net bags are designed to be detachable from the trawl body, but the current separation structure is complicated, and it is usually necessary to pull the part of the net bag combined with the trawl body out of the water for operation.

[0003] The currently disclosed Chinese patent CN202110143506.8 is a method for operating a nested trawl net bag for separating fish catches and allowing them to fall off, including a towing line. Its innovation lies in that it also includes a fixed frame, a connecting frame 1, a locking device 1, a tightening device 1, a tightening device 2, a connecting frame 2, a locking device 2, a fixing ring 1, a fixing ring 2, a fine mesh bag, a medium mesh bag, a large mesh bag and a guide ring; the left edge of the fixed frame is fixedly connected to the right end of the towing line, and a plurality of guide rings are evenly fixedly connected to the towing line; the connecting frame 1 is fixedly connected to the outside of the fixed frame by a plurality of locking devices 1, and the outer side of the connecting frame 1 is fixedly connected to the tightening device 1; the connecting frame 2 is located on the inner side of the connecting frame 1, and the connecting frame 2 is fixedly connected to the outside of the fixed frame by a plurality of locking devices 2, and the outer side of the connecting frame 2 is fixedly connected to the tightening device 2; the left side of the fine mesh bag is opened The opening of the tightening device is fixedly connected to the right edge of the connecting frame one, and a plurality of fixing rings one are evenly fixedly connected to the outside of the left longitudinal section of the fine mesh bag; the middle mesh bag is located on the inner side of the fine mesh bag, and the left opening of the middle mesh bag is fixedly connected to the right edge of the connecting frame two, and a plurality of fixing rings two are evenly fixedly connected to the outside of the left longitudinal section of the middle mesh bag; the large mesh bag is located on the inner side of the middle mesh bag, and the left opening of the large mesh bag is fixedly connected to the right opening of the fixing frame; the tightening rope on the right side of the tightening device one is connected in series in a ring-shaped manner to the corresponding fixing ring one in sequence, and the right end of the tightening rope is fixedly connected to the fixing ring one passed through for the first time; the tightening rope on the right side of the locking device two is connected in series in a ring-shaped manner to the corresponding fixing ring two in sequence, and the right end of the tightening rope is fixedly connected to the fixing ring two passed through for the first time; the pull ropes in the locking device one and the locking device two are connected to the fishing boat through the corresponding guide rings in sequence.

[0004] According to the above patent, the patent designs the net bag into multiple nested net bags, and the mesh size of each net bag is different. In this way, the separation of different sizes of catches can be reasonably achieved, reducing the sorting work of the staff. However, this method is inconvenient for collecting the net bags. Therefore, a net bag that can separate the trawl net body is needed. Summary of the invention

[0005] In view of the problems existing in the prior art, a fishing vessel trawl with a quickly detachable net bag is provided. The invention provides a setting that the net bag can be separated from the trawl main body separately, so that the fish in the net bag can be conveniently pulled out onto the ship, and due to the setting of a closing mechanism and a locking mechanism, the net mouth of the net bag is more tightly closed when the net bag is pulled out, thereby improving the degree of closure of the net bag closing mouth and ensuring that the fish can be smoothly escaped.

[0006] In order to solve the problems of the prior art, the technical solution adopted by the present invention is:

[0007] The present invention provides a fishing vessel trawl with a quickly detachable net bag, comprising a trawl main body and a net bag; the trawl main body is connected to the ship, the tail of the trawl main body is provided with an opening, and both sides of the opening of the tail of the trawl main body are provided with arc-shaped support rods; the net bag is arranged at the tail of the trawl main body, the net body of the net bag passes through the tail opening of the trawl main body and extends outward, and the net mouth edge of the net bag is arranged on the arc-shaped support rods; it also includes a separation and pulling device for pulling the net bag out of the trawl main body separately, and the separation and pulling device comprises a traction rope, a closing mechanism and a locking mechanism; one end of the traction rope is connected to the net bag, and the other end of the traction rope is connected to the ship; the closing mechanism and the locking mechanism are both arranged at the net mouth of the net bag, the closing mechanism is connected to the traction rope, and the locking mechanism and the closing mechanism cooperate with each other.

[0008] Preferably, the closing mechanism includes an upper cross bar and a lower cross bar; the upper cross bar is fixedly arranged above the mesh opening of the net bag; the lower cross bar is fixedly arranged below the mesh opening of the net bag, and the lower cross bar can move toward the upper cross bar. When the lower cross bar is close to the upper cross bar, the mesh opening of the net bag is gradually closed.

[0009] Preferably, a guide rope connected to the ship is provided on the upper opening of the trawl body, one end of the guide rope away from the ship is fixedly connected to the upper opening of the trawl body, and a guide ring slidably mounted on the guide rope is provided on the upper cross bar.

[0010] Preferably, a group of rings are connected to the edges of both sides of the net bag mouth between the upper cross bar and the lower cross bar, each group of rings has several rings, and the several rings are evenly spaced, the towing rope passes through the several rings in sequence, and the end of the towing rope not connected to the ship is fixedly connected to the lower cross bar.

[0011] Preferably, the locking mechanism includes a frame, a movable part and a locking part; the frame is fixedly arranged on the upper cross bar, the lower cross bar is located inside the frame, and both sides of the frame have arc tracks coaxial with the arc support rod; there are two movable parts, and the two movable parts are respectively arranged in an arc track; there are two locking parts, and the two locking parts are both arranged in the upper half of the frame, and each locking part is respectively located above a movable part; both ends of the lower cross bar are provided with fixing strips connected to the corresponding movable parts; a shell for installing the corresponding locking part is provided on the frame and at the position of each locking part.

[0012] Preferably, the movable member is specifically a movable rod, the fixed bar is fixedly connected to the end of the lower cross bar, a strip opening is horizontally opened on the fixed bar, one end of the movable rod is inserted in the strip opening, and the movable rod can move in the strip opening.

[0013] Preferably, the locking member includes a wedge, a guide rod and a spring; the wedge is arranged in the arc track, and the outer shell has a movable channel for the wedge to pass through, the moving direction of the wedge is perpendicular to the moving direction of the movable rod, and when the movable rod passes through the wedge, the wedge is in a state of being pressed into the movable channel by the movable rod; one end of the guide rod is fixedly connected to the wedge, and the other end of the guide rod extends outward through the outer shell, the axial direction of the guide rod is parallel to the channel opening direction of the movable channel, and a guide opening for the guide rod to pass through is opened on the outer shell; the spring is sleeved on the guide rod, and the two ends of the spring are respectively fixedly connected to the wedge and the outer shell, and when the wedge enters the movable channel, the spring is in a compressed state.

[0014] Preferably, the inclined surface of the wedge faces the lower crossbar.

[0015] Preferably, the end fixing sleeve of the movable rod passing through the strip-shaped opening on the fixing strip is provided with a first anti-drop cap.

[0016] Preferably, a second anti-drop cap is fixedly mounted on one end of the guide rod passing through the outer shell.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The present application provides a setting that the net bag can be separated from the trawl net body separately, so that the fish in the net bag can be conveniently pulled out to the ship, and due to the setting of the closing mechanism and the locking mechanism, the net mouth of the net bag is more tightly closed when it is pulled out, so that the net bag can more conveniently pull the fish out of the sea, improve the degree of closure of the net bag closing, and ensure that the fish school can be smoothly pulled out.

[0019] 2. The present application realizes the closing of the net bag by the movable coordination between the upper cross bar and the lower cross bar, and the net mouth of the net bag is connected between the upper cross bar and the lower cross bar, so that the net mouth of the net bag can be opened and closed with the movement of the upper cross bar and the lower cross bar, thereby preventing the fish from escaping from the net mouth when the net bag is being folded.

[0020] 3. The present application drives the movable part to move along the arc track on the frame toward the upper cross bar through the lower cross bar, so that the locking part positions the movable part, prompting the lower cross bar to always remain in a position close to the upper cross bar, thereby achieving the closure of the net bag mouth, ensuring that the fish in the net bag can be smoothly pulled out of the sea, and improving the net collection effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic diagram of a fishing vessel trawling with a quickly detachable net bag;

[0022] Figure 2 yes Figure 1 Schematic diagram of the cross section at AA;

[0023] Figure 3 yes Figure 2Schematic diagram of the cross section at BB;

[0024] Figure 4 A schematic diagram of a net bag separation trawl body of a fishing vessel trawl with a net bag that can be quickly separated;

[0025] Figure 5 The present invention is a three-dimensional structural diagram of a trawl main body, a net bag and a separation and pulling device of a fishing vessel trawl with a net bag that can be quickly separated;

[0026] Figure 6 yes Figure 5 The main view;

[0027] Figure 7 The present invention is a three-dimensional structural schematic diagram of a separation and pulling device for a fishing vessel trawl net with a net bag that can be separated quickly;

[0028] Figure 8 yes Figure 7 The main view;

[0029] Fig. 9 yes Figure 8 Sectional view at CC of ;

[0030] Fig.10 yes Figure 8 A three-dimensional structural cross-sectional view at CC;

[0031] Fig.11 yes Fig. 9 Enlarged schematic diagram of point D.

[0032] The numbers in the figure are:

[0033] 1- Trawl body;

[0034] 11-Opening;

[0035] 2-reticulum;

[0036] 3- arc support rod;

[0037] 31-Guide rope;

[0038] 4-Separation and pulling device;

[0039] 41- traction rope;

[0040] 42-closing mechanism; 421-upper cross bar; 4211-guide ring; 422-lower cross bar; 423-throwing ring;

[0041] 43-locking mechanism; 431-frame; 4311-arc track; 432-movable part; 4321-first anti-dropping cap; 433-locking part; 4331-wedge block; 4332-guide rod; 4333-spring; 4334-second anti-dropping cap; 434-fixing strip; 4341-strip opening; 435-housing; 4351-moving channel. DETAILED DESCRIPTION

[0042] In order to further understand the features, technical means, specific objectives and functions of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0043] See also Figure 1-Figure 11 As shown, a fishing vessel trawl with a quickly detachable net bag comprises a trawl body 1 and a net bag 2; the trawl body 1 is connected to the ship, the tail of the trawl body 1 has an opening 11, and both sides of the opening 11 at the tail of the trawl body 1 are provided with arc-shaped support rods 3; the net bag 2 is arranged at the tail of the trawl body 1, the net body of the net bag 2 extends outward through the tail opening 11 of the trawl body 1, and the net mouth edge of the net bag 2 is arranged on the arc-shaped support rods 3; it also includes a separation and pulling device 4 for pulling the net bag 2 out of the trawl body 1 separately, and the separation and pulling device 4 comprises a traction rope 41, a closing mechanism 42 and a locking mechanism 43; one end of the traction rope 41 is connected to the net bag 2, and the other end of the traction rope 41 is connected to the ship; the closing mechanism 42 and the locking mechanism 43 are both arranged at the net mouth of the net bag 2, the closing mechanism 42 is connected to the traction rope 41, and the locking mechanism 43 cooperates with the closing mechanism 42.

[0044] When the fishing boat drags the trawl main body 1 forward in the sea, the fish enter the net bag 2 at the tail of the trawl main body 1. When a certain amount of fish enters the net bag 2, the traction rope 41 can be reeled in so that the net bag 2 is separated from the opening 11 at the tail of the trawl main body 1 and moves toward the ship, thereby unloading the fish onto the ship. Due to the setting of the closing mechanism 42, the net opening of the net bag 2 is closed while the traction rope 41 is pulled upward. After the fish are unloaded, the traction rope 41 is released so that the net bag 2 is reloaded. Returning to the opening 11 at the tail of the trawl body 1, when the trawl body 1 is dragged, the arc shape of the arc-shaped support rod 3 enables the closing mechanism 42 to shrink the net opening of the net bag 2 better. Due to the setting of the locking mechanism 43, when the net opening of the net bag 2 is folded, the locking mechanism 43 cooperates with the closing mechanism 42 to close the net opening of the net bag 2, thereby preventing the fish from rushing out of the net bag 2 during the process of folding the net, until the net bag 2 is pulled onto the ship, and then the net opening of the net bag 2 is opened to take out the fish.

[0045] See also Figure 1-Figure 5As shown, the closing mechanism 42 includes an upper cross bar 421 and a lower cross bar 422; the upper cross bar 421 is fixedly arranged above the net opening of the net bag 2; the lower cross bar 422 is fixedly arranged below the net opening of the net bag 2, and the lower cross bar 422 can move toward the upper cross bar 421. When the lower cross bar 422 is close to the upper cross bar 421, the net opening of the net bag 2 is gradually closed.

[0046] When the net bag 2 is taken out, under the traction of the traction rope 41, the lower cross bar 422 gradually approaches the upper cross bar 421 until the lower cross bar 422 is close to the upper cross bar 421, and the net mouth of the net bag 2 is closed, and the fish is in the net bag 2. After the net bag 2 is pulled onto the ship, the upper cross bar 421 is separated from the lower cross bar 422, and the fish is taken out.

[0047] See also Figure 1-Figure 5 As shown, a guide rope 31 connected to the ship is provided on the upper part of the opening 11 of the trawl body 1, and one end of the guide rope 31 away from the ship is fixedly connected to the upper part of the opening 11 of the trawl body 1, and a guide ring 4211 slidably mounted on the guide rope 31 is provided on the upper cross bar 421.

[0048] When the traction rope 41 pulls the lower cross bar 422, the lower cross bar 422 approaches the upper cross bar 421 until the lower cross bar 422 is close to the upper cross bar 421, and the traction rope 41 continues to pull the lower cross bar 422, and the upper cross bar 421 is driven by the lower cross bar 422, and the upper cross bar 421 moves along the guide rope 31 through the guide ring 4211 until the net bag 2 is straightened on the ship.

[0049] See also Figure 3-Figure 6 As shown, a group of rings 423 are connected to the edges of both sides of the net opening of the net bag 2 between the upper cross bar 421 and the lower cross bar 422, each group of rings 423 has a plurality of rings, and the rings 423 are evenly spaced, the traction rope 41 passes through the plurality of rings 423 in sequence, and the end of the traction rope 41 that is not connected to the ship is fixedly connected to the lower cross bar 422.

[0050] When the traction rope 41 pulls the lower cross bar 422, since the traction rope 41 passes through a plurality of rings 423 to be connected to the lower cross bar 422, as the traction rope 41 pulls the lower cross bar 422, the lower cross bar 422 can be moved closer to the upper cross bar 421 during the pulling process, thereby avoiding the lower cross bar 422 from tilting during the pulling process and improving the degree of closure of the net mouth of the net bag 2 when it is closed.

[0051] See also Figure 7-10As shown, the locking mechanism 43 includes a frame 431, a movable part 432 and a locking part 433; the frame 431 is fixedly arranged on the upper cross bar 421, the lower cross bar 422 is located inside the frame 431, and both sides of the frame 431 have an arc track 4311 coaxial with the arc support rod 3; there are two movable parts 432, and the two movable parts 432 are respectively arranged in an arc track 4311; there are two locking parts 433, and the two locking parts 433 are both arranged in the upper half of the frame 431, and each locking part 433 is respectively located above a movable part 432; both ends of the lower cross bar 422 are provided with a fixing strip 434 connected to the corresponding movable part 432; a shell 435 for mounting the corresponding locking part 433 is provided on the frame 431 and at the position of each locking part 433.

[0052] When the lower cross bar 422 is pulled close to the upper cross bar 421, the lower cross bar 422 drives the movable part 432 to gradually approach the locking part 433 at the upper end of the frame 431, until the movable part 432 passes the locking part 433, and the movable part 432 is then positioned by the locking part 433, so that the lower cross bar 422 cannot be separated from the upper cross bar 421, and the lower cross bar 422 is kept in a position close to the upper cross bar 421. The net mouth of the net bag 2 is also always in a closed state, which prevents the fish from rushing out of the net bag 2.

[0053] See also Figure 7-10 As shown, the movable member 432 is specifically a movable rod, the fixed bar 434 is fixedly connected to the end of the lower cross bar 422, a strip opening 4341 is horizontally opened on the fixed bar 434, one end of the movable rod is inserted into the strip opening 4341, and the movable rod can move in the strip opening 4341.

[0054] When the movable part 432 moves with the lower cross bar 422, the movement of the lower cross bar 422 drives the movement of the fixed bar 434. Since the fixed bar 434 is provided with a bar-shaped opening 4341, the fixed bar 434 pushes the movable part 432 to move in the arc track 4311, and the movable part 432 moves along the arc track 4311 on the frame 431 toward the locking part 433. Due to the trajectory direction of the arc track 4311, the lower cross bar 422 can also accurately approach the upper cross bar 421 until the movable part 432 is positioned by the locking part 433, and the network port also remains in a closed state.

[0055] See also Fig.10 and Fig.11As shown, the locking member 433 includes a wedge block 4331, a guide rod 4332 and a spring 4333; the wedge block 4331 is arranged in the arc track 4311, and the housing 435 has a moving channel 4351 for the wedge block 4331 to pass through. The moving direction of the wedge block 4331 is perpendicular to the moving direction of the movable rod. When the movable rod passes through the wedge block 4331, the wedge block 4331 is in a state of being pressed into the moving channel 4351 by the movable rod; one end of the guide rod 4332 is fixed to the wedge block 4331 The other end of the guide rod 4332 extends outward through the shell 435, and the axial direction of the guide rod 4332 is parallel to the channel opening direction of the moving channel 4351. The shell 435 is provided with a guide opening for the guide rod 4332 to pass through; the spring 4333 is sleeved on the guide rod 4332, and the two ends of the spring 4333 are fixedly connected to the wedge block 4331 and the shell 435 respectively. When the wedge block 4331 enters the moving channel 4351, the spring 4333 is in a compressed state.

[0056] When the movable part 432 passes through the wedge block 4331, the wedge block 4331 will be squeezed by the movable part 432 into the moving channel 4351 of the shell 435, and the spring 4333 changes from a normal state to a compressed state. When the movable part 432 completely passes through the wedge block 4331, the spring 4333 returns to a normal state, and the wedge block 4331 then re-enters the arc track 4311 of the frame 431. The wedge block 4331 supports the movable part 432 so that the movable part 432 is restricted between the wedge block 4331 and the upper end of the arc track 4311, and the lower cross bar 422 always remains close to the upper cross bar 421.

[0057] See also Fig.11 As shown, the inclined surface of the wedge block 4331 faces the lower cross bar 422.

[0058] When the movable part 432 passes through the wedge block 4331, since the inclined surface of the wedge block 4331 faces the lower cross bar 422, the movable part 432 can push the wedge block 4331 into the moving channel 4351 along the inclined surface until the movable part 432 passes through the wedge block 4331, and the wedge block 4331 returns to its original position under the action of the spring 4333.

[0059] See also Figure 8 As shown, the end of the movable rod passing through the strip-shaped opening 4341 on the fixing strip 434 is fixedly sleeved with a first anti-dropping cap 4321 .

[0060] When the fixed bar 434 pushes the movable rod to move in the arc track 4311, the first anti-drop cap 4321 is provided at the end of the movable rod, thereby preventing the movable member 432 from escaping from the strip opening 4341 on the fixed bar 434 and always maintaining a state of being driven by the fixed bar 434.

[0061] See also Fig.11 As shown, one end of the guide rod 4332 passing through the housing 435 is fixedly sleeved with a second anti-drop cap 4334 .

[0062] When the wedge block 4331 is pushed by the movable part 432 into the movable channel 4351, the guide rod 4332 on the wedge block 4331 moves in the guide opening on the outer shell 435. Since the second anti-detachment cap 4334 is provided at the end of the guide rod 4332, the guide rod 4332 is prevented from escaping from the guide opening, thereby ensuring that the wedge block 4331 can move normally in the movable channel 4351.

[0063] The present application uses the setting that the net bag 2 can be separated from the trawl net body 1 separately, so that the fish in the net bag 2 can be conveniently pulled out to the ship, and due to the setting of the closing mechanism 42 and the locking mechanism 43, the net mouth of the net bag 2 is more tightly closed when it is pulled out, thereby improving the closing degree of the closing mouth of the net bag 2 and ensuring that the fish can be smoothly escaped.

[0064] The above embodiments only express one or several implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the attached claims.

Claims

1. A fishing vessel trawl with a quickly detachable net bag, comprising a trawl body (1) and a net bag (2); The trawl net body (1) is connected to a ship, the tail of the trawl net body (1) has an opening (11), and both sides of the opening (11) at the tail of the trawl net body (1) are provided with arc-shaped support rods (3); The net bag (2) is arranged at the tail of the trawl net body (1), the net body of the net bag (2) passes through the tail opening (11) of the trawl net body (1) and extends outward, and the edge of the net opening of the net bag (2) is placed on the arc-shaped support rod (3); It is characterized in that It also includes a separation and pulling device (4) for pulling the net bag (2) out of the trawl net body (1) separately, and the separation and pulling device (4) includes a traction rope (41), a closing mechanism (42) and a locking mechanism (43); One end of the traction rope (41) is connected to the net bag (2), and the other end of the traction rope (41) is connected to the ship; The closing mechanism (42) and the locking mechanism (43) are both arranged at the net opening of the net bag (2); the closing mechanism (42) is connected to the traction rope (41); and the locking mechanism (43) and the closing mechanism (42) cooperate with each other; The closing mechanism (42) comprises an upper cross bar (421) and a lower cross bar (422); The upper cross bar (421) is fixedly arranged above the net opening of the net bag (2); The lower cross bar (422) is fixedly arranged below the net opening of the net bag (2), and the lower cross bar (422) can move in the direction of the upper cross bar (421). When the lower cross bar (422) is close to the upper cross bar (421), the net opening of the net bag (2) is gradually closed. A guide rope (31) connected to a ship is provided at the upper portion of the opening (11) of the trawl main body (1); an end of the guide rope (31) away from the ship is fixedly connected to the upper portion of the opening (11) of the trawl main body (1); and a guide ring (4211) slidably sleeved on the guide rope (31) is provided on the upper cross bar (421); A group of rings (423) are connected to the edges of both sides of the net opening of the net bag (2) between the upper cross bar (421) and the lower cross bar (422), each group of rings (423) has a plurality of rings, and the plurality of rings (423) are evenly spaced. The traction rope (41) passes through the plurality of rings (423) in sequence, and the end of the traction rope (41) not connected to the ship is fixedly connected to the lower cross bar (422); The locking mechanism (43) comprises a frame (431), a movable part (432) and a locking part (433); The frame (431) is fixedly arranged on the upper cross bar (421), the lower cross bar (422) is located inside the frame (431), and both sides of the frame (431) have arc-shaped tracks (4311) coaxial with the arc-shaped support rod (3); There are two movable parts (432), and the two movable parts (432) are respectively arranged in an arc track (4311); There are two locking members (433), both of which are arranged on the upper half of the frame (431), and each locking member (433) is located above a movable member (432); Both ends of the lower crossbar (422) are provided with fixing bars (434) connected to corresponding movable members (432); A housing (435) for mounting the corresponding locking member (433) is provided on the frame (431) and at the position of each locking member (433); The movable member (432) is specifically a movable rod. The fixed bar (434) is fixedly connected to the end of the lower cross bar (422). A strip-shaped opening (4341) is horizontally opened on the fixed bar (434). One end of the movable rod is inserted into the strip-shaped opening (4341). The movable rod can move in the strip-shaped opening (4341). The locking member (433) includes a wedge block (4331), a guide rod (4332) and a spring (4333); The wedge block (4331) is arranged in the arc track (4311), and the housing (435) is provided with a moving channel (4351) for the wedge block (4331) to pass through. The moving direction of the wedge block (4331) is perpendicular to the moving direction of the movable rod. When the movable rod passes through the wedge block (4331), the wedge block (4331) is pressed into the moving channel (4351) by the movable rod. One end of the guide rod (4332) is fixedly connected to the wedge block (4331), and the other end of the guide rod (4332) passes through the housing (435) and extends outward. The axial direction of the guide rod (4332) is parallel to the direction of the channel opening of the moving channel (4351), and the housing (435) is provided with a guide opening for the guide rod (4332) to pass through. The spring (4333) is sleeved on the guide rod (4332), and two ends of the spring (4333) are fixedly connected to the wedge block (4331) and the housing (435) respectively. When the wedge block (4331) enters the moving channel (4351), the spring (4333) is in a compressed state.

2. A fishing vessel trawl with a quickly detachable net bag according to claim 1, characterized in that: The inclined surface of the wedge block (4331) faces the lower cross bar (422).

3. A fishing boat trawl with a quickly detachable net bag according to claim 2, characterized in that: The end fixing sleeve of the movable rod passing through the strip-shaped opening (4341) on the fixing strip (434) is provided with a first anti-drop cap (4321).

4. A fishing vessel trawl with a quickly detachable net bag according to claim 3, characterized in that: One end of the guide rod (4332) passing through the housing (435) is fixedly sleeved with a second anti-drop cap (4334).

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