阅读说明：本技术 一种海洋底栖生物采集装置 (Marine benthos collection system ) 是由 陈页 金衍健 李铁军 于 2020-11-23 设计创作，主要内容包括：本发明公开了一种海洋底栖生物采集装置,包括矩形底拖网箱、闸板及底封板,所述矩形底拖网箱前后贯通,位于矩形底拖网箱进口端两侧的侧面上设有平衡侧围板,所述平衡侧围板与矩形底拖网箱之间的间隙形成进水通道,所述底封板可拆卸连接在矩形底拖网箱出口端,所述闸板设置在矩形底拖网箱内靠近开口端的位置处,闸板上连接有能使闸板处于抬起或下落状态从而使矩形底拖网箱进口相应处于打开或闭合状态的弹性触发机构。本发明结构巧妙,使用方便、省力,使用时不易晃动,使用稳定性好,并能防止底栖生物从中逃逸的海洋底栖生物采集装置。(The invention discloses a marine benthos collecting device which comprises a rectangular bottom-towed net cage, a gate plate and a bottom sealing plate, wherein the rectangular bottom-towed net cage is through from front to back, balancing side enclosing plates are arranged on the side surfaces of two sides of the inlet end of the rectangular bottom-towed net cage, a water inlet channel is formed by a gap between each balancing side enclosing plate and the rectangular bottom-towed net cage, the bottom sealing plate is detachably connected to the outlet end of the rectangular bottom-towed net cage, the gate plate is arranged in the rectangular bottom-towed net cage and close to the opening end, and an elastic triggering mechanism which can enable the gate plate to be in a lifted or falling state so as to enable the inlet of the rectangular bottom-towed net cage to be. The marine benthos collecting device has the advantages of ingenious structure, convenience in use, labor saving, difficulty in shaking in use, good use stability and capability of preventing benthos from escaping from the marine benthos collecting device.)

1. The utility model provides a marine benthos collection system, its characterized in that, drags box with a net (1), flashboard (2) and end shrouding (3) at the bottom of the rectangle, drag the box with a net at the bottom of the rectangle and link up around, be located and be equipped with balanced side bounding wall (4) on the side of dragging box with a net entrance point both sides at the bottom of the rectangle, drag the clearance between the box with a net at the bottom of balanced side bounding wall and the rectangle and form inhalant canal (5), end shrouding can be dismantled and connect and drag the box with a net exit end at the bottom of the rectangle, the flashboard sets up the position department of being close to the open end in dragging the box with a net at the bottom of the rectangle, thereby is.

2. The marine benthos collection device according to claim 1, wherein the elastic trigger mechanism comprises a U-shaped support (6), a release pin and a release lever (7), the U-shaped support is fixed on the top surface of the rectangular bottom dragging net cage at a position close to the open end of the rectangular bottom dragging net cage, the gate plate penetrates through the rectangular bottom dragging net cage, the lower part of the gate plate is positioned in the rectangular bottom dragging net cage, a pressing plate (8) is fixed at the top end of the gate plate, two ends of the pressing plate protrude out of the gate plate to form a connecting part (9), guide rods (10) are arranged on two sides of the gate plate, the guide rods penetrate through the connecting part, the upper end of each guide rod is fixedly connected with the U-shaped support, the lower end of each guide rod is fixedly connected with the balance side wall plate, a tension spring (11) is sleeved on the part of each guide rod, which is positioned between the pressing plate and the balance side, the lower end of the release lever is fixedly connected with the pressing plate, a latch groove (12) is formed in the release lever, when the flashboard is in a lifting state, the U-shaped support penetrates through the release lever, the tension spring is stretched, and the release pin is inserted into the latch groove and is blocked and interfered with the U-shaped support.

3. The marine benthos collection device of claim 2, wherein the release pin comprises a pin body (13) and a pull ring (14), two balls (15) are symmetrically arranged in the pin body, a compression spring (16) is arranged between the balls, the balls partially expose out of the pin body and abut against the inner wall of the pin groove, and the pull ring is fixed at the upper end of the pin body and is rotatably connected with the pin body.

4. The marine benthos collection device of claim 3, wherein a guide sleeve (17) is fixed on the top surface of the U-shaped support, and the pin body is positioned in the guide sleeve and matched with the guide sleeve in a sliding manner.

5. The marine benthos collection device of claim 1, wherein mounting plates (18) are arranged on two side end faces of the inlet end of the rectangular bottom towing net cage, a push rod (19) is arranged between the mounting plates, two ends of the push rod are rotatably connected with the mounting plates, and a pull rope ring (20) is fixed on the push rod.

6. The marine benthos collection device of claim 1, wherein the bottom sealing plate is provided with a plug-in sleeve frame (21), the plug-in sleeve frame is inserted into the outlet end of the rectangular bottom-towed net cage and is matched with the inner wall of the rectangular bottom-towed net cage, the plug-in sleeve frame is fixedly connected with the rectangular bottom-towed net cage through a plug-in locking mechanism, and the bottom sealing plate is attached to the end face of the outlet end of the rectangular bottom-towed net cage.

7. The marine benthos collection device of claim 6, wherein the plug locking mechanism comprises a U-shaped insertion rod (22) and a locking socket, the U-shaped insertion rod penetrates through one side of the rectangular bottom-towed net cage and penetrates through the insertion sleeve frame and then penetrates out of the other side of the rectangular bottom-towed net cage, and the end parts of the two ends of the U-shaped insertion rod are inserted into the locking socket fixed on the rectangular bottom-towed net cage and are fixed in the locking socket.

8. The marine benthos collection device of claim 7, wherein the locking socket comprises a socket body (23) and a lock bead (24), a blind insertion hole (25) is formed in the socket body, lock bead holes (26) communicated with the blind insertion hole are symmetrically formed in two sides of the blind insertion hole, the lock bead is located in the lock bead holes, a jacking piece (27) is connected to the lock bead holes in a threaded mode, a compression spring is arranged between the jacking piece and the lock bead, the lock bead is partially exposed out of the blind insertion hole, a return spring (28) is arranged at the bottom of the blind insertion hole, a top plate (29) is fixed at the upper end of the return spring, annular arc-shaped clamping grooves (30) are formed in positions, close to the end portions, of two ends of the U-shaped insertion rod, and the annular arc-shaped clamping grooves are matched with the.

9. The marine benthos collection device according to claim 7 or 8, wherein the U-shaped insertion rod is provided at both end portions thereof with guide slopes.

10. The marine benthos collection device of claim 5, wherein said bottom closure plate is provided with filter holes.

Technical Field

The invention relates to a marine benthos collecting tool, in particular to a marine benthos collecting device.

Background

The investigation of marine benthos is an important component of basic comprehensive investigation of marine science, and particularly, the number of offshore seabed sediments is increased continuously due to the influence of human activities, so that the composition and biomass of benthos communities living on seabed substrates are seriously influenced. Therefore, research and study of marine benthos have been increasingly focused.

At present, an A-type trawl is generally adopted when marine benthonic animals are collected in a marine shallow water area, and the A-type trawl is placed at the water bottom for towing when the A-type trawl is used, so that the A-type trawl is used for qualitatively capturing or collecting benthonic organisms in bottom mud.

For example, chinese patent No. CN206251770U, granted No. 2017.06.16 discloses a collecting device for collecting benthic organisms, which includes a main frame, an opening is opened at one end of the main frame, handles are fixed to two sides of an end portion of the main frame provided with the opening, a metal wrapping for reinforcing connection between the handles and the main frame is provided around the surface of the end portion of the main frame provided with the opening, a mesh for collecting benthic organisms in silt is provided around the surface of the main frame except the surface surrounded by the metal wrapping, and an iron chain for binding a rope is fixed between the two handles. The collecting device has the following defects: (1) in the dragging process, the end part of the main frame at the opening is easy to shake to be separated from the sea bottom surface to generate a gap, so that benthos inhabiting on the sea bottom surface or the bottom mud surface layer cannot be captured or collected, and the sampling accuracy is influenced; (2) the opening is always in an open state, and benthos easily escape from the opening in the process of being pulled upwards; (3) the tail of the main frame can only be lifted, benthos in the main frame can be poured out from the opening, the labor is wasted, and the operation is very inconvenient.

Disclosure of Invention

The invention aims to solve the technical problems of the existing collecting device for collecting benthos, and provides the marine benthos collecting device which has the advantages of ingenious structure, convenient and labor-saving use, difficult shaking in use, good use stability and capability of preventing benthos from escaping from the collecting device.

In order to achieve the purpose, the invention adopts the following technical scheme: the utility model provides a marine benthos collection system, drags box with a net, flashboard and end shrouding at the bottom of the rectangle, drag the box with a net at the bottom of the rectangle and link up around the box with a net, be located and drag at the bottom of the rectangle and be equipped with balanced side bounding wall on the side of box with a net entrance point both sides, the clearance that drags between the box with a net at the bottom of balanced side bounding wall and the rectangle forms water inlet channel, the box with a net exit end is dragged at the bottom of the rectangle to end shrouding can be dismantled and connection, the flashboard sets up the position department that is close to the open end in dragging the box with a net at the bottom of. The collecting device adopts the rectangular bottom-dragging net cage to collect samples, and has a firm structure; in the dragging process, the rectangular bottom dragging net cage can shake due to uneven water yield caused by filtration along with the collection of bottom mud or benthos in the rectangular bottom dragging net cage, the side surfaces of two sides of the inlet end of the rectangular bottom dragging net cage are provided with balance side coamings which play a role in stabilizing the inlet end of the rectangular bottom dragging net cage, so that the rectangular bottom dragging net cage is not easy to shake and can be kept attached to the sea floor; the seawater channels on the two sides of the rectangular bottom-towed net cage can enable seawater to pass through in the dragging process of the rectangular bottom-towed net cage, and the water passing amount is uniform, so that the internal and external stresses of the balance side wall plates on the two sides are kept uniform, and the rectangular bottom-towed net cage is further prevented from shaking; according to the invention, the flashboard is arranged at a position close to the opening end in the rectangular bottom-towed net cage, during sampling, the flashboard is in a lifting state, so that the inlet of the rectangular bottom-towed net cage is in an open state for facilitating sampling, and after sampling, the flashboard falls down through the elastic trigger mechanism in the pulling process, so that the inlet of the rectangular bottom-towed net cage is in a closed state, and benthos in the rectangular bottom-towed net cage cannot escape from the rectangular bottom-towed net cage in the pulling process; the rectangular bottom dragging net cage outlet end can be detachably connected with a bottom sealing plate, so long as the bottom sealing plate in the lifted rectangular bottom dragging net cage is directly detached, benthos or bottom mud in the rectangular bottom dragging net cage can be collected in a container from the bottom outlet of the rectangular bottom dragging net cage under the self-weight effect, and the rectangular bottom dragging net cage is very convenient and labor-saving to use.

Preferably, the elastic triggering mechanism comprises a U-shaped support, a releasing pin and a releasing lever, the U-shaped support is fixed at a position, close to the opening end of the rectangular bottom dragging net cage, on the top surface of the rectangular bottom dragging net cage, the flashboard penetrates through the rectangular bottom dragging net cage, the lower part of the flashboard is positioned in the rectangular bottom dragging net cage, a pressing plate is fixed at the top end of the flashboard, two ends of the pressing plate protrude out of the flashboard to form a connecting part, guide rods are arranged at two sides of the flashboard and penetrate through the connecting part, the upper end of each guide rod is fixedly connected with the U-shaped support, the lower end of each guide rod is fixedly connected with the corresponding balance side wall plate, a tension spring is sleeved on the part, between the pressing plate and the balance side wall plate, the upper end of each tension spring is fixedly connected with the corresponding balance side wall plate, the lower end of, the release lever is penetrated with the U-shaped bracket, the tension spring is stretched, and the release pin is inserted into the latch groove and is blocked and interfered with the U-shaped bracket. In the invention, the guide rod plays a role in guiding and can ensure the vertical up-and-down movement of the flashboard; when the flashboard is in a lifting state, the tension spring is stretched, the pull rope is connected to the release pin, the pull rope is pulled to enable the release pin to be withdrawn from the latch groove, the release lever loses the limiting effect of the release pin, the pressing plate drives the flashboard to move downwards under the action of the restoring force of the tension spring until the flashboard is contacted with the rectangular bottom dragging net cage, the rectangular bottom dragging net cage is in an opening closed state at the moment, benthos in the rectangular bottom dragging net cage cannot escape from the opening closed state, and the flashboard is in a lifting or falling state through the release pin, the release lever, the tension spring and other structural units, so that the inlet of the rectangular bottom dragging net cage is correspondingly in an opening or.

Preferably, the release pin comprises a pin body and a pull ring, two balls are symmetrically arranged in the pin body, a pressure spring is arranged between the balls, the balls partially expose out of the pin body and are tightly abutted against the inner wall of the pin groove, and the pull ring is fixed at the upper end of the pin body and is rotatably connected with the pin body. The ball is tightly propped against the inner wall of the bolt groove, so that the release bolt is labor-saving to insert and pull.

Preferably, a guide sleeve is fixed on the top surface of the U-shaped support, and the pin body is positioned in the guide sleeve and matched with the guide sleeve in a sliding manner. The guide sleeve can guarantee that the pin body is perpendicular to the release lever all the time for the stay cord enables the pin body to withdraw from the bolt groove fast when pulling the release pin.

Preferably, the rectangular bottom dragging net cage is provided with mounting plates on the end surfaces of two sides of the inlet end, a push rod is arranged between the mounting plates, two ends of the push rod are rotatably connected with the mounting plates, and a cable pulling ring is fixed on the push rod. The push rod can push larger stones away, so that the larger stones are prevented from entering the rectangular bottom trawl box; the inhaul cable ring is used for connecting a dragging rope for dragging the rectangular bottom dragging net cage, and the push rod is rotatably connected with the mounting plate, so that the dragging rope can also rotate by taking the push rod as an axis, and the rectangular bottom dragging net cage is prevented from being upwards pulled up due to the fact that the dragging rope and the mounting plate are relatively fixed.

Preferably, the bottom sealing plate is provided with a plug-in sleeve frame, the plug-in sleeve frame is inserted into the outlet end of the rectangular bottom-dragging net cage and is matched with the inner wall of the rectangular bottom-dragging net cage, the plug-in sleeve frame is fixedly connected with the rectangular bottom-dragging net cage through a plug-in locking mechanism, and the bottom sealing plate is attached to the end face of the outlet end of the rectangular bottom-dragging net cage. The inserting sleeve frame plays roles of connection and limiting, and the bottom sealing plate is prevented from shaking.

Preferably, the plug locking mechanism comprises a U-shaped inserted bar and a locking socket, the U-shaped inserted bar penetrates through one side of the rectangular bottom-dragging net cage and penetrates out of the other side of the rectangular bottom-dragging net cage after penetrating through the plug sleeve frame, and the end parts of the two ends of the U-shaped inserted bar are inserted into the locking socket fixed on the rectangular bottom-dragging net cage and are fixed in the locking socket. Make the dismouting of end shrouding very convenient through plug locking mechanism, pass the rectangle end with U type inserted bar and drag the box with a net, insert the locking socket behind the grafting box with a net, just can realize dragging fixed between the box with a net at the end of end shrouding and the rectangle, withdraw from the unblock back with U type inserted bar from the locking socket again, drag the box with a net, draw out in the grafting box with a net at the end of with U type inserted bar from the rectangle, just can realize dragging the separation between the box with a net at the end of end shrouding and the rectangle, it is very convenient to operate.

Preferably, the locking socket comprises a socket body and a lock bead, wherein an inserting blind hole is formed in the socket body, lock bead holes communicated with the inserting blind hole are symmetrically formed in two sides of the inserting blind hole, the lock bead is located in the lock bead holes, a jacking piece is connected to the inner threads of the lock bead holes, a pressure spring is arranged between the jacking piece and the lock bead, the lock bead is partially exposed out of the inserting blind hole, a return spring is arranged at the bottom of the inserting blind hole, a top plate is fixed to the upper end of the return spring, annular arc-shaped clamping grooves are formed in the positions, close to the end portions, of two ends of the U-shaped inserting rod, and the annular arc-shaped clamping grooves are matched. The U-shaped insertion rod is inserted into the insertion blind hole, and when the locking balls are clamped into the annular arc-shaped clamping grooves, the U-shaped insertion rod is locked and fixed in the locking socket and cannot withdraw from the locking socket; the U-shaped inserted bar is pushed inwards fast, the lock balls are compressed and retracted into the lock ball holes, the end parts of the two ends of the U-shaped inserted bar can move inwards continuously to prop against the top plate and enable the return spring to compress to a certain degree, the U-shaped inserted bar is pulled out fast outwards, the U-shaped inserted bar can be pulled out fast from the socket body under the action of the restoring force of the return spring and the outward tensile force, and the U-shaped inserted bar and the locking socket can be separated and unlocked fast.

Preferably, the two end parts of the U-shaped inserted bar are provided with guide inclined planes.

Preferably, the bottom sealing plate is provided with filter holes. The filtering holes are arranged on the bottom sealing plate, so that the resistance of the resistance rectangular bottom dragging net box during dragging can be reduced.

Therefore, the invention has the following beneficial effects:

(1) the side surfaces of two sides of the inlet end of the rectangular bottom-towed net cage are provided with balance side coamings, so that the rectangular bottom-towed net cage is not easy to shake and can be kept attached to the sea floor;

(2) the gate plate is arranged at a position close to the opening end in the rectangular bottom-towed net cage, and the gate plate is controlled to be in a lifted or falling state through the elastic triggering mechanism, so that the inlet of the rectangular bottom-towed net cage is correspondingly in an opened or closed state, smooth sampling can be realized, and benthos can not escape from the rectangular bottom-towed net cage in the pulling process of the rectangular bottom-towed net cage after sampling can be realized;

(3) the rectangle end drags box with a net exit end can be dismantled and is connected with end shrouding, end shrouding through the cooperation between grafting frame and the plug locking mechanism with the rectangle end drags box with a net fixed connection for the dismouting of end shrouding is very convenient, as long as the end shrouding in the rectangle end drags the box with a net of directly will hoisting is torn open, just enables the benthos or the bed mud in the rectangle end drags the box with a net under the dead weight effect and directly falls to the container and collect from the bottom export of the rectangle end drag box with a net, and it is very convenient, laborsaving to use.

Drawings

Fig. 1 is a front view of the present invention.

Fig. 2 is a right side view of fig. 1.

Fig. 3 is a schematic view of a connection between the bottom closure plate and the plug bush.

Fig. 4 is a right side view of fig. 3.

Fig. 5 is a schematic view of a connection of the U-shaped insert rod with the locking socket.

Fig. 6 is a partially enlarged view of a portion a in fig. 5.

Figure 7 is a schematic view of a release pin and release lever connection.

Fig. 8 is a partial enlarged view of fig. 7 at B.

In the figure: dragging box with a net 1 at the bottom of the rectangle, flashboard 2, end shrouding 3, balanced side bounding wall 4, water inlet channel 5, U type support 6, release lever 7, clamp plate 8, connecting portion 9, guide bar 10, extension spring 11, bolt groove 12, round pin body 13, pull ring 14, ball 15, pressure spring 16, uide bushing 17, mounting panel 18, push rod 19, cable ring 20, grafting cover frame 21, U type inserted bar 22, socket body 23, lock pearl 24, grafting blind hole 25, lock pearl hole 26, top tension disc 27, return spring 28, top piece 29, cyclic annular arc draw-in groove 30.

Detailed Description

The invention is further described with reference to the following figures and detailed description.

As shown in fig. 1 and 2, the marine benthos collection device comprises a rectangular bottom-dragging net cage 1, a gate 2 and a bottom sealing plate 3, wherein the rectangular bottom-dragging net cage is made of stainless steel and is communicated with the front and the back, filter holes are formed in the rectangular bottom-dragging net cage, mounting plates 18 are arranged on the two side end faces of the inlet end of the rectangular bottom-dragging net cage, a push rod 19 is fixed between the mounting plates, the two ends of the push rod are rotatably connected with the mounting plates, a pull cable ring 20 is fixed on the push rod, balance side wall plates 4 are fixed on the side faces of the two sides of the inlet end of the rectangular bottom-dragging net cage, a water inlet channel 5 is formed by the gap between each balance side wall plate and the rectangular bottom-dragging net cage, a filter hole is formed in the bottom sealing plate, a plug-in sleeve frame 21 (shown in fig. 3 and 4) is fixed on the bottom sealing plate, the plug-in sleeve frame is inserted into the, the bottom sealing plate is attached to the end face of the outlet end of the rectangular bottom dragging net cage; the plug locking mechanism comprises a U-shaped inserted link 22 and a locking socket, the two end parts of the U-shaped inserted link are provided with guide inclined planes, the locking socket comprises a socket body 23 and a lock bead 24 (as shown in figures 5 and 6), the socket body is internally provided with an inserting blind hole 25, the two sides of the inserting blind hole are symmetrically provided with a lock bead hole 26 communicated with the inserting blind hole, the lock bead is positioned in the lock bead hole, the lock bead hole is internally connected with a jacking sheet 27, a pressure spring 16 is arranged between the jacking sheet and the lock bead, the lock bead is partially exposed out of the inserting blind hole, the bottom of the inserting blind hole is provided with a return spring 28, the upper end of the return spring is fixed with a top sheet 29, the positions of the two ends of the U-shaped inserted link close to the end parts are provided with annular arc-shaped clamping grooves 30, the U-shaped inserted link penetrates through one side of the net cage with a rectangular bottom and penetrates out of the other side of the net cage after passing through the inserting sleeve frame, the, the end surfaces of the two ends of the U-shaped inserted rod are not contacted with the top plate; the gate plate is arranged in the rectangular bottom-towed net cage close to the opening end, and an elastic trigger mechanism which can enable the gate plate to be in a lifting or falling state so as to enable the inlet of the rectangular bottom-towed net cage to be correspondingly in an opening or closing state is connected to the gate plate; the elastic trigger mechanism comprises a U-shaped support 6, a release pin and a release lever 7, the release pin comprises a pin body 13 and a pull ring 14 (shown in figure 7 and figure 8), two balls 15 are symmetrically arranged in the pin body, a pressure spring is arranged between the balls, the balls are partially exposed out of the pin body, the U-shaped support is fixed on the top surface of the rectangular bottom dragging net cage at a position close to the opening end of the rectangular bottom dragging net cage, the flashboard penetrates through the rectangular bottom dragging net cage, the lower part of the flashboard is positioned in the rectangular bottom dragging net cage, a pressure plate 8 is fixed at the top end of the flashboard, two ends of the pressure plate protrude out of the flashboard to form a connecting part 9, guide rods 10 are arranged on two sides of the flashboard, the guide rods penetrate through the connecting part, the upper ends of the guide rods are fixedly connected with the U-shaped support, the lower ends of the guide rods are fixedly connected with the balance side wall plates, a tension, release lever lower extreme and clamp plate fixed connection are equipped with cotter way 12 on the release lever, and U type support top surface is fixed with uide bushing 17, and when the flashboard was in the state of lifting up, wear U type support on the release lever, the extension spring is tensile, and the round pin body is located the uide bushing and is slipped fit with the uide bushing, and round pin body lower extreme inserts cotter way, and the ball supports tightly with cotter inslot wall, and the round pin body takes place to block with U type support and interferes, and the round pin body upper end exposes outside the uide bushing, and the pull ring is fixed and is connected with the rotation of round pin.

The using method of the invention comprises the following steps: inserting the splicing sleeve frame into the outlet end of the rectangular bottom-towed net cage, inserting the U-shaped inserted bar into one side of the rectangular bottom-towed net cage, penetrating the U-shaped inserted bar through the splicing sleeve frame, penetrating the U-shaped inserted bar out of the other side of the rectangular bottom-towed net cage, and inserting the U-shaped inserted bar into the locking socket to fixedly connect the bottom sealing plate and the rectangular bottom-towed net cage; a dragging rope (not shown in the figure) is tied on the dragging rope ring, a dragging rope (not shown in the figure) is tied on the pulling ring, when the flashboard is kept in a lifting state and the opening of the rectangular bottom dragging net cage is in an open state, the device is thrown into the seabed and dragged on a ship at a constant speed, and benthos or bottom mud is collected into the rectangular bottom dragging net cage to be collected during dragging; after the rectangular bottom trawl cage is dragged for a certain time, the dragging rope is retracted, the pulling rope is quickly pulled when the rectangular bottom trawl cage is pulled, so that the release pin is pulled out from the pin slot, the flashboard falls under the action of the restoring force of the tension spring, and the inlet of the rectangular bottom trawl cage is in a closed state, so that benthos in the rectangular bottom trawl cage cannot escape from the rectangular bottom trawl cage in the pulling process; after the rectangular bottom dragging net cage is pulled up, the U-shaped inserted bar is quickly pushed inwards, the lock balls are compressed and retracted into the lock ball holes, the end parts of the two ends of the U-shaped inserted bar can continuously move inwards to prop against the top plate and enable the return spring to be compressed to a certain degree, the U-shaped inserted bar is quickly pulled outwards, the U-shaped inserted bar can be quickly pulled out from the socket body under the action of the restoring force of the return spring and the outward tensile force, and finally, the U-shaped inserted bar is pulled out from the rectangular bottom dragging net cage, the bottom sealing plate is taken away, benthos or bottom mud in the rectangular bottom dragging net cage can be collected from the bottom outlet of the rectangular bottom dragging net cage under the action of self weight.

The above-described embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention in any way, and other variations and modifications may be made without departing from the spirit of the invention as set forth in the claims.