An all-round protection net structure for a deep water flow aerator used for cultivating Humphead wrasse

Abstract

The present invention belongs to the technical field of protection of water jet aerators, and discloses an all-round protection net structure for a deep water flow aerator for culturing starry groupers, including a water jet aerator, and further including a cover plate and a bearing assembly respectively arranged at the top and bottom of the water jet aerator. Through the cooperation of structures such as an internal cleaning assembly and a bearing assembly, the airflow impact of the aeration head causes the guide plate to rotate, and the second scraper rubs against the inner wall of the protection net. The protection net is in a fixed state, which enables the rotating second scraper to better rub and cut the moss. The internal cleaning assembly drives the turbine to rotate through the transmission ring, thereby pumping the water around it through the collection assembly. The moss scraped off by the second scraper contacts the diversion plate immediately, so that the broken moss approaches the outer periphery of the water jet aerator under the guidance of the diversion plate, and thus is sucked by the collection assembly to prevent the moss from adhering to the water jet aerator and causing damage to the water jet aerator.

Description

Technical Field

[0001] The present invention belongs to the technical field of aerator protection, and specifically relates to an all-round protection net structure for a deep-water flow aerator used for culturing Epinephelus akaara Background Technique

[0002] Epinephelus akaara, also known as leopard coral grouper, is a coral reef fish living in tropical and subtropical waters. Because of its delicious meat and rich nutrition, it is a common ingredient in high-end seafood restaurants. To increase the dissolved oxygen in the water body, maintain water quality stability, and promote the healthy growth of Epinephelus akaara. In artificially cultured ponds, water jet aerators are generally installed. However, due to the large number of Epinephelus akaara cultured, to ensure that the fish group will not be injured by the aeration head of the water jet aerator due to colliding with it, a protective net is generally installed outside the water jet aerator;

[0003] Since the protective net is located underwater, over a long period of operation, the protective net will be covered with moss or other small aquatic plants. These mosses cling to the inner wall of the protective net. After growing for a long time, they will block the protective net, resulting in unsmooth air output of the aerator, reducing the oxygen delivery rate, and at the same time increasing the operation load of the aerator, causing the internal motor to be damaged due to overload. Therefore, we provide an all-round protection net structure for a deep-water flow aerator used for culturing Epinephelus akaara Summary of the Invention

[0004] To solve the problems raised in the above background technique, the present invention provides an all-round protection net structure for a deep-water flow aerator used for culturing Epinephelus akaara, solving the problems that moss or other aquatic plants on the protection net block the protection net, resulting in unsmooth air output of the aerator, reducing the oxygen delivery rate, and motor overload damage

[0005] To achieve the above object, the present invention provides the following technical solution: An all-round protection net structure for a deep-water flow aerator used for culturing Epinephelus akaara, including a water jet aerator, and also including;

[0006] A cover plate and a bearing assembly respectively arranged at the top and bottom of the water jet aerator;

[0007] The bearing assembly includes a positioning disk fixedly installed at the bottom of the water jet aerator. The outer edge of the positioning disk is clamped with a limiting ring through a transmission ring. The bottom of the limiting ring is fixedly connected to the positioning disk through a limiting rod. The bottom of the transmission ring is drivingly connected to a turbine movably sleeved on the limiting rod;

[0008] A protection net is arranged between the limiting ring and the cover plate. Several collection assemblies are installed at the top of the limiting ring. The turbine rotates and extracts the water around the water jet aerator through the collection assemblies;

[0009] A number of outer cleaning components circumferentially and equally angularly installed on the outer edge of the limit ring and a number of inner cleaning components installed on the transmission ring;

[0010] The inner cleaning component includes a first positioning plate and a second positioning plate fixedly installed on the top of the transmission ring. A number of drainage plates are equidistantly hinged on the second positioning plate. A second scraper vertically movable inside the first positioning plate is respectively hinged on the outer side of each drainage plate. A guide plate is jointly hinged on the side of each drainage plate. A guiding plate is fixedly installed at the lower end of the guide plate. The jet orifice of the water jet aerator faces the side of the guiding plate.

[0011] Preferably, the bearing component further includes a guide ring installed on the top of the limit ring. The guide ring is in a closed-loop wave shape, and the bottom of the guide plate abuts against the top of the guide ring.

[0012] Preferably, a cylinder is installed at the bottom of the limit ring. A number of notches are circumferentially and equally angularly arranged on the outer circumference of the cylinder. The turbine is located inside the cylinder.

[0013] Preferably, the cover plate is composed of two metal semi-disks. The two semi-disks are connected by a number of nuts. The top of the protective net is fixedly clamped on the two merged semi-disks.

[0014] Preferably, the outer cleaning component includes a positioning block movably clamped on the outer edge of the limit ring. A first scraper is fixedly installed on the top of the positioning block. Two limit sleeves are symmetrically installed at the bottom of the positioning block. A groove is respectively opened on the same side of the two limit sleeves. Two guide rods are symmetrically hinged at the bottom of the transmission ring. The guide rods are inserted into the grooves on the limit sleeves. The bottom of the transmission ring is elastically connected to the guide rods through a first spring piece located on the same side of the two guide rods.

[0015] Preferably, the collection component includes a collection box fixedly installed on the top of the limit ring. A closing plate is elastically connected inside the collection box through two second spring pieces. Each second spring piece and the closing plate form a group. The two groups of second spring pieces and the closing plate are symmetrically arranged. A hole communicating with the inside of the collection box is arranged at the bottom of the positioning disk. The hole is located above the turbine.

[0016] Preferably, when the axes of one of the inner cleaning components, the collection component and the turbine are on the same horizontal line, the opening on the outside of the collection box faces the inner cleaning component.

[0017] Preferably, the two second spring pieces always push each closing plate to block the opening of the collection box. A metal filter screen with a large aperture is arranged inside the hole on the limit ring.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] Through the cooperation of structures such as the internal cleaning component and the bearing component in the present invention, the airflow of the aeration head impacts the guide plate to rotate, and the second scraper rubs against the inner wall of the protective net. The protective net is in a fixed state, which enables the rotating second scraper to better rub and cut the moss, thereby further improving the efficiency of cleaning the protective net. The internal cleaning component drives the turbine to rotate through the transmission ring, thereby extracting the water around it through the collection component. The moss scraped off by the second scraper contacts the drainage plate immediately, so that the broken moss approaches the direction of the periphery of the water jet aerator under the guidance of the drainage plate, and is thus sucked by the collection component to prevent the moss from adhering to the water jet aerator and causing damage to the water jet aerator.

[0020] Through the cooperation of structures such as the bearing component and the external cleaning component in the present invention, when the transmission ring rotates, the first guide rod first collides with the limit rod and disengages from the notch on the limit sleeve. At this time, the second guide rod is still clamped in the groove of the limit sleeve through the first spring piece, so that the positioning block and the first scraper rotate simultaneously. The first scraper can clean the moss attached to the outer periphery of the protective net at this time. When the second guide rod contacts the limit rod and is blocked by it, the guide rod folds. However, the first folded guide rod has passed by the limit rod, and the first spring piece pushes the first guide rod to be re-clamped in the groove of the limit sleeve, and drives the first scraper to rotate and cut the notch on the outside of the protective net through the positioning block, thereby further improving the cleaning effect; at the same time, the fluency of the device is also improved.

[0021] Through the cooperation of structures such as the bearing component and the collection component in the present invention, when the turbine rotates, it extracts the water inside the collection box through the hole at the bottom of the limit ring. Under the guidance of the water pressure, the two closing plates fold and compress each second spring piece. The outer periphery of the collection box is in an open state and can extract the moss that slides from the drainage plate to the periphery of the water jet aerator. The moss finally contacts and is broken by the turbine through the hole on the limit ring. Working in this way will reduce the probability of moss growing on the protective net and outside the water jet aerator, and further reduce the time for subsequent cleaning and maintaining the device. Description of the Drawings

[0022] Figure 1 is the schematic diagram of the external structure of the present invention;

[0023] Figure 2 is the schematic diagram of the internal structure of the protective net of the present invention;

[0024] Figure 3 is the exploded schematic diagram of the split structure of the cover plate and the protective net of the present invention;

[0025] Figure 4 is the schematic diagram of the structural cooperation between the bearing component and the internal cleaning component of the present invention;

[0026] Figure 5Exploded view of the split structure of the guiding ring and the inner cleaning component of the present invention;

[0027] Figure 6 Schematic diagram of the internal structure cooperation of the collection box of the present invention;

[0028] Figure 7 Schematic diagram of the bottom structure of the bearing component of the present invention;

[0029] Figure 8 Exploded view of the split structure of the bearing component of the present invention;

[0030] Figure 9 Schematic diagram of the bottom of the working cooperation between the outer cleaning component and the bearing component of the present invention.

[0031] In the figure: 1. Cover plate; 2. Protection net; 3. Water jet aerator; 4. Bearing component; 41. Positioning disk; 42. Transmission ring; 43. Limiting ring; 44. Guiding ring; 45. Limiting rod; 46. Turbine; 5. Outer cleaning component; 51. Positioning block; 52. Scraper 1; 53. Spring piece 1; 54. Guiding rod; 55. Limiting sleeve; 6. Inner cleaning component; 61. Positioning plate 1; 62. Positioning plate 2; 63. Drainage plate; 64. Scraper 2; 65. Guiding plate; 66. Guide plate; 7. Collection component; 71. Collection box; 72. Spring piece 2; 73. Sealing plate. Detailed implementation manners

[0032] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0033] As Figures 1 to 9 shown, the present invention provides a deep water flow aerator all-round protection net structure for cultivating starry groupers, including a water jet aerator 3, and also including;

[0034] A cover plate 1 and a bearing component 4 respectively arranged at the top and bottom of the water jet aerator 3;

[0035] The bearing component 4 includes a positioning disk 41 fixedly installed at the bottom of the water jet aerator 3. The outer edge of the positioning disk 41 is clamped with a limiting ring 43 through a transmission ring 42. The bottom of the limiting ring 43 is fixedly connected to the positioning disk 41 through a limiting rod 45. The bottom of the transmission ring 42 is drivingly connected to a turbine 46 movably sleeved on the limiting rod 45;

[0036] A protective net 2 is provided between the limit ring 43 and the cover plate 1. Several collecting components 7 are installed on the top of the limit ring 43. The turbine 46 rotates and extracts the water around the water jet aerator 3 through the collecting components 7.

[0037] Several outer cleaning components 5 installed at equal angles circumferentially on the outer edge of the limit ring 43 and several inner cleaning components 6 installed on the transmission ring 42.

[0038] The inner cleaning component 6 includes a first positioning plate 61 and a second positioning plate 62 fixedly installed on the top of the transmission ring 42. Several drainage plates 63 are hinged at equal distances on the second positioning plate 62. A second scraper 64 that vertically moves inside the first positioning plate 61 is hinged on the outer side of each drainage plate 63. A guide plate 65 is jointly hinged on the side of each drainage plate 63. A guiding plate 66 is fixedly installed at the lower end of the guide plate 65. The jet orifice of the water jet aerator 3 faces the side of the guiding plate 66.

[0039] Adopting the above scheme: When the water jet aerator 3 is enabled, the airflow ejected by its aeration head impacts the guiding plate 66. Since the guiding plate 66 is inclined, this enables the guiding plate 66 to better contact the airflow. At this time, the inner cleaning component 6 will drive the transmission ring 42 to rotate. At the same time, the second scraper 64 will also scrape the inner wall of the protective net 2, so that the moss attached to the inner wall of the protective net 2 falls off and is cut off by the second scraper 64.

[0040] Since the positioning disk 41 is fixedly connected to the limit ring 43 through the limit rod 45, and the bottom of the limit rod 45 directly sits on the bottom of the pond during the working state, the limit ring 43 and the positioning disk 41 are in the same fixed posture. The cover plate 1 is fixedly connected to the top of the water jet aerator 3 and is also in a fixed posture. This indicates that the protective net 2 is also in a fixed state, which enables the rotating second scraper 64 to better scrape the moss, thus further improving the cleaning efficiency of the protective net 2.

[0041] The moss scraped off by the second scraper 64 contacts the drainage plate 63 for the first time, so that the broken moss is guided by the drainage plate 63 to approach the outer periphery of the water jet aerator 3. The transmission ring 42 drives the turbine 46 to rotate at the same time, so as to extract the water around it through the collecting components 7, so as to prevent the moss from attaching to the water jet aerator 3 and causing damage to the water jet aerator 3.

[0042] As Figures 1 - 6 shown, the bearing component 4 further includes a guide ring 44 installed on the top of the limit ring 43. The guide ring 44 is in a closed-loop wavy shape, and the bottom of the guide plate 65 abuts against the top of the guide ring 44.

[0043] Adopting the above solution: The weight of the guiding plate 66 presses the guiding plate 65 against the guiding ring 44 all the time. Therefore, when the inner cleaning assembly 6 rotates, the guiding plate 65 moves up and down under the guidance of the guiding ring 44. The angles at both ends of the drainage plate 63 are restricted by the positioning plate one 61 and will alternately change reciprocally. When the outer ends of the drainage plate 63 move up and down, the scraping range of the second scraper 64 on the inner wall of the protective net 2 expands, so as to better remove moss.

[0044] Moreover, the width at the top of the guiding ring 44 can also enable the guiding plate 65 to horizontally move on the top of the guiding ring 44 when the drainage plate 63 swings, so as to prevent the bottom of the guiding plate 65 from detaching from the guiding ring 44, and further improve the stability of the swing of the second scraper 64.

[0045] As Figures 1 - 6 shown, a cylinder is installed at the bottom of the limiting ring 43. Several notches are circumferentially and equally angled on the outer periphery of the cylinder, and the turbine 46 is located inside the cylinder.

[0046] Adopting the above solution: When the device is not in water, the cylinder can ensure that the turbine 46 will not be damaged due to collision with external objects during the storage process of the device. Further, when working in water, the notches on the cylinder can also enable the water pumped by the turbine 46 to flow out smoothly.

[0047] As Figure 1 - As shown in Figure 3, the cover plate 1 is composed of two metal semi - discs. The two semi - discs are connected by several nuts. The top of the protective net 2 is fixedly clamped on the two merged semi - discs.

[0048] Adopting the above solution: During subsequent maintenance and repair, by disassembling the nuts, the cover plate 1 can be changed into two semi - discs. Further, the protective net 2 will not be clamped between the two semi - discs. Further, the water jet aerator 3 can be directly taken out from the top of the protective net 2 and will not be blocked by the cover plate 1, thereby improving the convenience of subsequent use of the device.

[0049] Figures 1 - 9 The outer cleaning assembly 5 includes a positioning block 51 movably clamped on the outer edge of the limiting ring 43. A first scraper 52 is fixedly installed on the top of the positioning block 51. Two limiting sleeves 55 are symmetrically installed at the bottom of the positioning block 51. A groove is respectively opened on the same side of the two limiting sleeves 55. Two guiding rods 54 are symmetrically hinged at the bottom of the transmission ring 42. The guiding rods 54 are inserted into the grooves on the limiting sleeves 55. The bottom of the transmission ring 42 is elastically connected with the guiding rods 54 through a first spring piece 53 on the same side of the two guiding rods 54.

[0050] Adopting the above solution: When the transmission ring 42 rotates, the first guide rod 54 first collides with the limit rod 45, and the first guide rod 54 then disengages from the notch on the limit sleeve 55. At this time, the second guide rod 54 still remains clamped in the groove of the limit sleeve 55 through the first spring piece 53, causing the positioning block 51 and the first scraper 52 to rotate simultaneously. At this time, the first scraper 52 can clean the moss attached to the outer periphery of the protective net 2, thereby further improving the cleaning effect;

[0051] When the second guide rod 54 contacts the limit rod 45 and is blocked by it, the guide rod 54 folds. However, the first folded guide rod 54 has passed by the limit rod 45. The first spring piece 53 pushes the first guide rod 54 to be re-clamped in the groove of the limit sleeve 55, and drives the first scraper 52 to rotate through the positioning block 51 to cut the notch on the outside of the protective net 2, thereby better improving the smoothness of the device and avoiding jamming when the transmission ring 42 rotates outside the cleaning assembly 5.

[0052] As Figures 1 - 6 shown, the collection assembly 7 includes a collection box 71 fixedly installed on the top of the limit ring 43. Inside the collection box 71, there is a closing plate 73 elastically connected by two second spring pieces 72. Each second spring piece 72 and the closing plate 73 form a group, and the two groups of second spring pieces 72 and the closing plate 73 are symmetrically arranged. There is a hole communicating with the inside of the collection box 71 at the bottom of the positioning disk 41, and the hole is located above the turbine 46.

[0053] When the axes of one of the inner cleaning assemblies 6, the collection assembly 7, and the turbine 46 are on the same horizontal line, the opening on the outside of the collection box 71 faces the inner cleaning assembly 6.

[0054] The two second spring pieces 72 always push each closing plate 73 to block the opening of the collection box 71. Inside the hole on the limit ring 43, there is a metal filter net with a large aperture.

[0055] Adopting the above solution: When the turbine 46 rotates, it extracts the water inside the collection box 71 through the hole at the bottom of the limit ring 43. Under the guidance of the water pressure, the two closing plates 73 fold and compress each second spring piece 72. The outer periphery of the collection box 71 is in an open state, and it can extract the moss that slides from the drainage plate 63 to the periphery of the water jet aerator 3. The moss finally contacts and is broken by the turbine 46 through the hole on the limit ring 43. Working in this way repeatedly will reduce the probability of moss growing on the protective net 2 and outside the water jet aerator 3, and further reduce the time for subsequent cleaning and maintaining the device;

[0056] When the device is not working, the second spring pieces 72 push the closing plates 73 to block the opening of the collection box 71, thereby preventing water from guiding debris to fall on the metal filter net and causing blockage. The filter net can prevent oversized debris, such as stones, from damaging the turbine 46.

[0057] Working principle and usage process of the present invention:

[0058] The airflow jetted by the water jet aerator 3 impacts the guiding plate 66, driving the transmission ring 42 to rotate by the inner cleaning assembly 6. The second scraper 64 also scrapes the inner wall of the protective net 2, causing the moss attached to the inner wall of the protective net 2 to fall off and be cut by the second scraper 64;

[0059] The weight of the inner cleaning assembly 6 presses the guiding plate 65 against the guiding ring 44 all the time. Therefore, when the inner cleaning assembly 6 rotates, the guiding plate 65 moves up and down under the guidance of the guiding ring 44. The two ends of the drainage plate 63 are restricted by the second positioning plate 62 and will change reciprocally and alternately. When the outer end of the drainage plate 63 moves up and down, the range where the second scraper 64 scrapes the inner wall of the protective net 2 expands;

[0060] The transmission ring 42 drives the turbine 46 to rotate simultaneously. It extracts the water inside the collection box 71 through the holes at the bottom of the limiting ring 43. Under the guidance of the water pressure, the two closing plates 73 fold over and compress each second spring piece 72. The outer periphery of the collection box 71 is in an open shape and can extract the moss that slides from the drainage plate 63 to the periphery of the water jet aerator 3. The moss finally contacts and is broken by the turbine 46 through the holes on the limiting ring 43;

[0061] When the transmission ring 42 rotates, the first guiding rod 54 collides with the limiting rod 45 first, and the first guiding rod 54 then disengages from the notch on the limiting sleeve 55. At this time, the second guiding rod 54 is still clamped in the groove of the limiting sleeve 55 through the first spring piece 53, causing the positioning block 51 and the first scraper 52 to rotate simultaneously. The first scraper 52 can clean the moss attached to the outer periphery of the protective net 2 at this time;

[0062] When the second guiding rod 54 contacts the limiting rod 45 and is blocked by it, the guiding rod 54 folds. However, the first folded guiding rod 54 has passed by the limiting rod 45. The first spring piece 53 pushes the first guiding rod 54 to be clamped in the groove of the limiting sleeve 55 again and drives the first scraper 52 to rotate and cut the notch on the outside of the protective net 2 through the positioning block 51.

[0063] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0064] Although embodiments of the present invention have been shown and described, those of ordinary skill in the art will appreciate that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An all-round protection net structure for a deep water flow aerator used in the cultivation of starry groupers, including a water jet aerator (3), characterized in that, Further comprising; A cover plate (1) and a bearing assembly (4) respectively arranged at the top and bottom of the water jet aerator (3); The bearing assembly (4) includes a positioning disk (41) fixedly installed at the bottom of the water jet aerator (3). The outer edge of the positioning disk (41) is clamped with a limiting ring (43) through a transmission ring (42). The bottom of the limiting ring (43) is fixedly connected with the positioning disk (41) through a limiting rod (45). The bottom of the transmission ring (42) is drivingly connected with a turbine (46) movably sleeved on the limiting rod (45); A protective net (2) is arranged between the limiting ring (43) and the cover plate (1). Several collecting assemblies (7) are installed at the top of the limiting ring (43). The turbine (46) rotates and extracts the water around the water jet aerator (3) through the collecting assemblies (7); Several outer cleaning assemblies (5) circumferentially and equiangularly installed on the outer edge of the limiting ring (43) and several inner cleaning assemblies (6) installed on the transmission ring (42); The inner cleaning assembly (6) includes a first positioning plate (61) and a second positioning plate (62) fixedly installed at the top of the transmission ring (42). Several drainage plates (63) are equidistantly hinged on the second positioning plate (62). A second scraper (64) vertically movable inside the first positioning plate (61) is respectively hinged on the outer side of each drainage plate (63). A guide plate (65) is jointly hinged on the side surface of each drainage plate (63). A guide plate (66) is fixedly installed at the lower end of the guide plate (65). The jet orifice of the water jet aerator (3) faces the side surface of the guide plate (66); The bearing assembly (4) further includes a guide ring (44) installed at the top of the limiting ring (43). The guide ring (44) is in a closed-loop wave shape. The bottom of the guide plate (65) abuts against the top of the guide ring (44); The outer cleaning assembly (5) includes a positioning block (51) movably clamped on the outer edge of the limiting ring (43). A first scraper (52) is fixedly installed at the top of the positioning block (51). Two limiting sleeves (55) are symmetrically installed at the bottom of the positioning block (51). A groove is respectively opened on the same side of the two limiting sleeves (55). Two guide rods (54) are symmetrically hinged at the bottom of the transmission ring (42). The guide rods (54) are inserted into the grooves on the limiting sleeves (55). The bottom of the transmission ring (42) is elastically connected with the guide rods (54) through a first spring piece (53) located on the same side of the two guide rods (54); 2. The all-round protection net structure of the deep water flow aerator for culturing Epinephelus akaara according to claim 1, wherein: A cylinder is installed at the bottom of the limiting ring (43). Several notches are circumferentially and equiangularly arranged on the outer circumference of the cylinder. The turbine (46) is located inside the cylinder; 3. The all-round protection net structure of the deep water flow aerator for culturing Epinephelus akaara according to claim 1, wherein: The cover plate (1) is composed of two metal semi-disks. The two semi-disks are connected by several nuts. The top of the protective net (2) is fixedly clamped on the two merged semi-disks; 4. The all-round protection net structure of the deep water flow aerator for culturing Epinephelus akaara according to claim 2, wherein: The collection component (7) includes a collection box (71) fixedly installed on the top of the limit ring (43). Inside the collection box (71), a closing plate (73) is elastically connected by two second spring pieces (72). Each second spring piece (72) and the closing plate (73) form a group, and the two groups of second spring pieces (72) and the closing plate (73) are symmetrically arranged. At the bottom of the positioning disk (41), there is a hole communicating with the inside of the collection box (71), and the hole is located above the turbine (46).

5. The all-round protection net structure of the deep water flow aerator for culturing Humphead wrasse according to claim 4, characterized in that: When the axes of one of the inner cleaning components (6), the collection component (7), and the turbine (46) are on the same horizontal line, the opening on the outside of the collection box (71) faces the inner cleaning component (6).

6. The all-round protection net structure of the deep water flow aerator for cultivating Epinephelus akaara according to claim 5, characterized in that: The two second spring pieces (72) always push the respective closing plates (73) to block the opening of the collection box (71), and a large-aperture metal filter net is arranged inside the hole on the limit ring (43).

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