Zooplankton bait separation and purification device and separation method thereof

Abstract

The invention belongs to the technical field of purification devices, and discloses a zooplankton bait separation and purification device and a separation method thereof.The zooplankton bait separation and purification device comprises a separation box, a middle cylinder is fixedly connected to the interior of the separation box, a sealing assembly is arranged in the middle cylinder, and a feeding assembly is arranged above the separation box. Through cooperation of the middle cylinder and the sealing assembly, when the middle cylinder is sealed, a solution primarily filtered by a computer is stored in a centralized mode, after the middle cylinder is opened, an attractant directionally injected from the outer side is used for attracting active zooplanktons to move out of the middle cylinder, and the inactivated zooplanktons are reserved in the middle cylinder; active zooplankton and dead zooplankton are separated through sealing and opening control of the sealing assembly and the middle cylinder, purification treatment of the zooplankton is further completed after primary filtration, it is guaranteed that the proportion of the active zooplankton in obtained separated mixed liquid is high, the quality of the purified zooplankton as bait is improved, and the quality of the purified zooplankton is improved. And dead zooplankton decomposition pollution is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of purification devices, and in particular relates to a zooplankton bait separation and purification device and a separation method thereof. Background Art

[0002] Zooplankton bait separation and purification device is mainly used to separate and purify zooplankton, especially natural bait in aquaculture such as rotifers. Zooplankton is the key bait for feeding aquatic animals such as young fish, young shrimp, young crabs, etc. in aquaculture, and usually needs to be separated and purified.

[0003] During use, the zooplankton bait separation and purification device in the prior art needs to separate and purify the zooplankton bait of the target quality from the culture tank after the actual cultivation is completed to obtain high-quality bait. However, in the actual separation and purification process, the activity of the living zooplankton bait is affected. During the separation and purification process, the zooplankton is exposed to some physical and chemical stress factors (such as centrifugal force, filtration pressure, temperature changes, etc.), which may affect the survival rate and health status of the zooplankton and reduce its effect as bait. On the one hand, it causes an increase in the proportion of dead zooplankton. On the other hand, there are a large number of dead individuals in the finally separated zooplankton, which cannot be effectively separated, further affecting the bait quality. Summary of the invention

[0004] The object of the present invention is to provide a zooplankton bait separation and purification device and a separation method thereof to solve the problems raised in the above-mentioned background technology.

[0005] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: a zooplankton bait separation and purification device and a separation method thereof, comprising a separation box, an intermediate cylinder is fixedly connected to the interior of the separation box, a sealing assembly is arranged inside the intermediate cylinder, a feeding assembly is arranged above the separation box, a primary separation part is arranged above the feeding assembly, a control motor is arranged at the bottom of the separation box, the control motor controls the rotation of the sealing assembly, a side opening is opened on the outer side surface of the intermediate cylinder, and a control liquid injection part is arranged at the bottom of the primary separation part. The bottom of the feeding assembly is fixedly connected to an injection assembly, which includes an injection pipe, an injection hole and a solenoid valve. The injection hole is opened on the outside of the injection pipe, the injection pipe is connected to the feeding assembly, the injection assembly is located on the outside of the intermediate cylinder, and the feeding assembly stores an attractant.

[0006] Preferably, the feeding assembly includes a connecting ring, a support rod, a feeding barrel and a curved pipe, the support rod is fixed on the top of the connecting ring, the feeding barrel is located above the side of the connecting ring, the curved pipe is fixedly connected between the connecting ring and the feeding barrel, and the feeding barrel is connected to the connecting ring through the curved pipe.

[0007] Preferably, the injection pipe is fixedly connected to the bottom of the connecting ring and is connected to the inside of the connecting ring, and the solenoid valve is fixedly installed on the top of the injection pipe.

[0008] Preferably, the attractant consists of one or any one of nutrients and chemical attractants.

[0009] Preferably, the sealing assembly includes a rotating cylinder, an intermediate plate, a rotating shaft and an adapter port, the intermediate plate is fixedly connected in the rotating cylinder, the rotating cylinder is rotatably sleeved inside the intermediate cylinder, the adapter port is opened on the outer surface of the rotating cylinder, the adapter port corresponds to the side port one by one, the side port is located on the rotation path of the adapter port, the rotating shaft is rotatably installed at the bottom of the separation box, and the upper end of the rotating shaft is fixedly connected to the intermediate plate, and the lower end of the rotating shaft is fixedly connected to the output shaft of the control motor.

[0010] Preferably, the primary separation part includes a top box, filter screen 1 and filter screen 2, and the filter screen 1 and filter screen 2 are fixedly connected to the inside of the top box from bottom to top, and the top box is fixedly connected to the top of the support rod.

[0011] Preferably, the controlled liquid injection portion includes a bottom tube and a switch valve, the bottom tube is fixedly connected to the bottom of the top box and communicated with the interior of the top box, the switch valve is fixedly arranged at the bottom of the bottom tube and controls the opening and closing of the lower end of the bottom tube.

[0012] Preferably, an isolation ring is fixedly connected to the interior of the separation box, and the isolation rings are evenly spaced up and down in the separation box. A sleeve hole is opened on the top of the isolation ring, and the sleeve hole is connected to the injection pipe. The isolation rings and the injection holes are alternately distributed.

[0013] Preferably, a temperature sensor extending into the interior of the separation box is fixedly embedded on the outer side of the separation box, and a No. 1 hole and a No. 2 hole are respectively provided at the bottom of the separation box, and the No. 1 hole and the No. 2 hole are respectively located on the inner and outer sides of the middle tube, and sealing plugs are provided at the bottom of the No. 1 hole and the No. 2 hole.

[0014] A separation method of a zooplankton bait separation and purification device comprises the following operating steps: Step 1: Pour the liquid mixed with zooplankton to be separated into the primary separation part at a low speed. Larger particles and impurities are filtered above the filter screen 2, and the filter screen 1 further filters smaller particles and impurities. The filtered micro zooplankton is concentrated in the liquid above and below the filter screen 1 in a static state. Step 2: Open the switch valve in the liquid injection control part, and control it to open intermittently. When it is opened, the mixed liquid filtered by the primary filter falls into the separation box and is injected into the interior of the intermediate cylinder. After the injection is completed, start the injection assembly at the bottom of the feeding assembly, and the solenoid valve in the injection assembly opens. The attractant stored in the feeding assembly is input into the injection pipe and injected into the solution in the separation box along the injection hole; Step 3: In the solution containing zooplankton injected into the middle cylinder, the active zooplankton moves toward the attractant, passes through the side port and gathers near the injection hole. After a period of attraction, the control motor is started to drive the sealing component to rotate, the rotating cylinder rotates to seal the side port, and the control injection part is started to inject the next round of zooplankton removal solution; Step 4: After the injection is allowed to stand, the rotating cylinder is rotated again, and the side port is opened. The active zooplankton in the rotating cylinder is moved out again, and the broken, dead and inactive zooplankton is retained in the middle cylinder; Step 5: Open hole No. 1 and hole No. 2 to realize the extraction of the separated solution, and obtain a purified mixed solution of active zooplankton and a mixed solution of dead and inactive zooplankton.

[0015] The beneficial effects of the present invention are as follows: 1. The present invention realizes primary filtration of larger impurity particles by utilizing filter screen 1 and filter screen 2 provided in the primary separation part in cooperation with the slowly input mixed liquid, and at the same time realizes downward injection of the filtrate in the primary separation part by utilizing the controlled liquid injection part at the bottom of the primary separation part, through intermittent start-up and quantitative downward injection of a certain amount of liquid, and utilizes the downward gravity flow and sinking effect of the liquid in the top box during the downward injection to promote the filtration of the liquid and filter screen 1 and filter screen 2, thereby preventing the continuous flow of liquid from squeezing and killing the zooplankton passing through when impacting the filter screen, and guiding the filtration through buffered intermittent self-weight, thereby greatly reducing the influence on the activity of the zooplankton during filtration, realizing protective separation and purification, improving the survival rate of the zooplankton bait during the separation process, and improving the quality of the bait finally separated.

[0016] 2. The present invention realizes quantitative and directional introduction of zooplankton attractant by utilizing injection assembly, cooperates with the intermediate tube and the sealing assembly, and stores the solution after computer primary filtration in a centralized manner when the intermediate tube is sealed. After opening, the attractant injected directionally from the outside is utilized to attract active zooplankton to be removed from the intermediate tube, and the inactive zooplankton is retained in the intermediate tube. The active zooplankton and the dead zooplankton are separated by sealing and opening control of the sealing assembly and the intermediate tube. After primary filtration, the zooplankton is further purified to ensure that the proportion of active zooplankton in the obtained separated mixed solution is high, thereby improving the quality of the purified zooplankton as bait and avoiding decomposition and pollution of dead zooplankton.

[0017] 3. The present invention utilizes multiple groups of isolation rings in the separation box, and coordinates the alternating distribution of the isolation rings and the injection holes to divide the interior of the separation box into different upper and lower sections. By cooperating with the injection of attractants into the injection holes in different sections, the zooplankton suspended at different depths can be attracted more strongly, thereby further expanding the purification effect and ensuring that the zooplankton at different depths in the liquid are effectively separated and purified. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a cross-sectional schematic diagram of the present invention; Figure 3 It is a cross-sectional schematic diagram of the primary separation part and the control injection part of the present invention; Figure 4 It is a schematic diagram of a feeding assembly and an injection assembly of the present invention; Figure 5 It is an exploded schematic diagram of the injection assembly of the present invention; Figure 6 It is a schematic diagram of the sleeve connection between the intermediate cylinder and the sealing assembly of the present invention; Figure 7 is a schematic diagram of the sealing group of the present invention; Figure 8 It is a schematic cross-sectional view of the separation box of the present invention.

[0019] In the figure: 1. separation box; 2. intermediate cylinder; 3. sealing assembly; 31. rotating cylinder; 32. intermediate plate; 33. rotating shaft; 34. adapter; 4. control motor; 5. temperature sensor; 6. feeding assembly; 61. connecting ring; 62. support rod; 63. feeding cylinder; 64. curved pipe; 7. primary separation part; 71. top box; 72. filter screen one; 73. filter screen two; 8. injection assembly; 81. injection pipe; 82. injection hole; 83. solenoid valve; 9. control injection part; 91. bottom pipe; 92. switch valve; 10. side port; 11. isolation ring; 12. sleeve hole; 13. hole number one; 14. hole number two. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] like Figures 1 to 8As shown, an embodiment of the present invention provides a zooplankton bait separation and purification device and a separation method thereof, including a separation box 1, an intermediate cylinder 2 is fixedly connected to the interior of the separation box 1, a sealing assembly 3 is provided in the interior of the intermediate cylinder 2, a feeding assembly 6 is provided above the separation box 1, a primary separation part 7 is provided above the feeding assembly 6, a control motor 4 is provided at the bottom of the separation box 1, the control motor 4 controls the sealing assembly 3 to rotate, a side port 10 is provided on the outer side of the intermediate cylinder 2, a control liquid injection part 9 is provided at the bottom of the primary separation part 7, an injection assembly 8 is fixedly connected to the bottom of the feeding assembly 6, the injection assembly 8 includes an injection pipe 81, an injection hole 82 and a solenoid valve 83, the injection hole 82 is provided on the outside of the injection pipe 81, the injection pipe 81 is connected to the feeding assembly 6, the injection assembly 8 is located on the outside of the intermediate cylinder 2, and the feeding assembly 6 stores an attractant.

[0022] Embodiment: Pour the liquid mixed with zooplankton to be separated into the primary separation part 7 at a low speed, filter the larger particles and impurities above the filter screen 2 73, and filter screen 1 72 further filters the smaller particles and impurities, and the filtered micro zooplankton is concentrated in the upper and lower liquids of the filter screen 1 72 in a static state, open the switch valve 92 in the control injection part 9, and control it to open intermittently. When it is opened, the mixed liquid after primary filtration falls into the separation box 1 and is injected into the interior of the intermediate cylinder 2. After the injection is completed, start the injection component 8 at the bottom of the feeding component 6, and the solenoid valve 83 in the injection component 8 is opened. The attractant stored in the feeding component 6 is input into the injection pipe 81 and injected into the solution of the separation box 1 along the injection hole 82; located in the middle In the solution containing zooplankton injected into the intermediate cylinder 2, the active zooplankton moves toward the attractant, passes through the side port 10 and gathers near the injection hole 82. After a period of attraction, the control motor 4 is started to drive the sealing component 3 to rotate, the rotating cylinder 31 rotates to seal the side port 10, and the control injection part 9 is started to inject the next round of zooplankton removal solution; after the injection is allowed to stand, the rotating cylinder 31 is rotated again, the side port 10 is opened, and the active zooplankton in the rotating cylinder 31 moves out again, and the broken, dead and inactive zooplankton is retained in the intermediate cylinder 2, and the No. 1 hole 13 and the No. 2 hole 14 are opened to realize the extraction of the separated solution, so as to obtain a purified mixed solution of active zooplankton and a mixed solution of dead and inactive zooplankton.

[0023] Firstly, by utilizing the filter screen 1 72 and the filter screen 2 73 provided in the primary separation section 7, in cooperation with the slowly input mixed liquid, primary filtration of larger impurity particles is achieved, and at the same time, by utilizing the controlled liquid injection section 9 at the bottom of the primary separation section 7, intermittent starting is performed, and a certain amount of liquid is quantitatively injected downwardly, so as to achieve downward injection of the filtrate in the primary separation section 7, and the downward gravity flow and sinking of the liquid in the top box 71 during the downward injection is utilized to push the liquid and the filter screen 1 72 and the filter screen 2 73 for filtration, so as to avoid the continuous flow of liquid from squeezing and killing the zooplankton passing through when impacting the filter screen, and through the buffered intermittent self-weight-guided filtration, the activity of the zooplankton is greatly affected during filtration, so as to achieve protective separation and purification, improve the survival rate of the zooplankton bait during the separation process, and improve the quality of the bait finally separated.

[0024] In addition, the quantitative and directional introduction of the zooplankton attractant is achieved by utilizing the injection component 8, and the cooperation between the intermediate tube 2 and the sealing component 3 is coordinated. When the intermediate tube is sealed, the solution after computer primary filtration is stored centrally, and after opening, the attractant injected directionally from the outside is used to attract the active zooplankton to move out of the intermediate tube 2, and the inactive zooplankton is retained in the intermediate tube 2. The sealing and opening control of the sealing component 3 and the intermediate tube 2 are used to separate the active zooplankton from the dead zooplankton. After the primary filtration, the zooplankton purification process is further completed to ensure that the proportion of active zooplankton in the separated mixed solution is high, improve the quality of the purified zooplankton as bait, and avoid decomposition and pollution of dead zooplankton.

[0025] On the other hand, by utilizing multiple sets of isolation rings 11 in the separation box 1 and coordinating the alternating distribution of the isolation rings 11 and the injection holes 82, the interior of the separation box 1 can be divided into different upper and lower sections. By coordinating the injection of attractants into the injection holes in different sections, the attraction of zooplankton suspended at different depths can be enhanced, thereby further expanding the purification effect and ensuring that zooplankton at different depths in the liquid are effectively separated and purified.

[0026] Among them, the feeding assembly 6 includes a connecting ring 61, a support rod 62, a feeding barrel 63 and a curved pipe 64. The support rod 62 is fixed on the top of the connecting ring 61. The feeding barrel 63 is located above the side of the connecting ring 61. The curved pipe 64 is fixedly connected between the connecting ring 61 and the feeding barrel 63. The feeding barrel 63 is connected to the connecting ring 61 through the curved pipe 64. The injection pipe 81 is fixedly connected to the bottom of the connecting ring 61 and is connected to the inside of the connecting ring 61. The solenoid valve 83 is fixedly installed on the top of the injection pipe 81.

[0027] The feeding assembly 6 injects the attractant through the feeding barrel 63 for storage and standby, and when the solenoid valve 83 is opened, the injection pipe 81 is connected to the connecting ring 61, the attractant is released, and the bottom of the injection pipe 81 is closed.

[0028] The attractant is composed of one or any one of nutrients and chemical attractants.

[0029] Used to attract zooplankton to move in a specified direction.

[0030] Among them, the sealing assembly 3 includes a rotating cylinder 31, an intermediate plate 32, a rotating shaft 33 and an adapter port 34. The intermediate plate 32 is fixedly connected to the rotating cylinder 31. The rotating cylinder 31 is rotatably sleeved inside the intermediate cylinder 2. The adapter port 34 is opened on the outer surface of the rotating cylinder 31. The adapter port 34 corresponds to the side port 10 one by one. The side port 10 is located on the rotation path of the adapter port 34. The rotating shaft 33 is rotatably installed at the bottom of the separation box 1, and the upper end of the rotating shaft 33 is fixedly connected to the intermediate plate 32, and the lower end of the rotating shaft 33 is fixedly connected to the output shaft of the control motor 4.

[0031] The sealing assembly realizes sealing control of the side opening 10 , ensures active removal of active zooplankton when opened, and injects unpurified zooplankton mixture when sealed, preventing zooplankton that loses activity during injection from spreading to various parts of the separation box 1 .

[0032] Among them, the primary separation part 7 includes a top box 71, a filter screen 1 72 and a filter screen 2 73, the filter screen 1 72 and the filter screen 2 73 are fixedly connected to the inside of the top box 71 from bottom to top, the top box 71 is fixedly connected to the top of the support rod 62, the control injection part 9 includes a bottom tube 91 and a switch valve 92, the bottom tube 91 is fixedly connected to the bottom of the top box 71 and is connected to the inside of the top box 71, the switch valve 92 is fixedly arranged at the bottom of the bottom tube 91, and controls the opening and closing of the lower end of the bottom tube 91.

[0033] By utilizing the primary separation section 7 and the controlled liquid injection section 9, quantitative liquid discharge is achieved, and by utilizing the active sinking of the liquid in the primary separation section 7 under the action of intermittent liquid discharge, relatively stable filtration is achieved, thereby avoiding damage to zooplankton caused by water flow impact.

[0034] Among them, the interior of the separation box 1 is fixedly connected with an isolation ring 11, which is evenly spaced up and down in the separation box 1. A sleeve hole 12 is opened on the top of the isolation ring 11, and the sleeve hole 12 is connected to the injection pipe 81. The isolation ring 11 and the injection hole 82 are alternately distributed.

[0035] By utilizing the isolation ring 11, the injected attractant is treated in layers to ensure that zooplankton at different depths are attracted and moved out of the intermediate tube 2, thereby achieving more comprehensive active separation and purification.

[0036] Among them, a temperature sensor 5 extending into the interior of the separation box 1 is fixedly embedded on the outer side of the separation box 1, and a No. 1 hole 13 and a No. 2 hole 14 are respectively opened at the bottom of the separation box 1. The No. 1 hole 13 and the No. 2 hole 14 are respectively located on the inner and outer sides of the intermediate tube 2, and the bottoms of the No. 1 hole 13 and the No. 2 hole 14 are both provided with sealing plugs.

[0037] By using the temperature sensor 5 to sense the temperature change and ensure the appropriate temperature for separation and purification, the No. 1 hole 13 and the No. 2 hole 14 complete the separation of the purified active zooplankton solution and the separation of the dead zooplankton.

[0038] A separation method of a zooplankton bait separation and purification device comprises the following operating steps: Step 1: Pour the liquid mixed with zooplankton to be separated into the primary separation part 7 at a low speed, and the larger particles and impurities are filtered above the filter screen 2 73, and the filter screen 1 72 further filters the smaller particles and impurities. The filtered micro zooplankton is concentrated in the liquid above and below the filter screen 1 72 in a static state; Step 2: Open the switch valve 92 in the liquid injection part 9, and control it to open intermittently. When it is opened, the mixed liquid after primary filtration falls into the separation box 1 and is injected into the interior of the intermediate cylinder 2. After the injection is completed, start the injection component 8 at the bottom of the feeding component 6, and the solenoid valve 83 in the injection component 8 is opened. The attractant stored in the feeding component 6 is input into the injection pipe 81 and injected into the solution of the separation box 1 along the injection hole 82; Step 3: In the solution containing zooplankton injected into the middle cylinder 2, the active zooplankton moves toward the attractant, passes through the side port 10 and gathers near the injection hole 82. After a period of attraction, the control motor 4 is started to drive the sealing assembly 3 to rotate, the rotating cylinder 31 rotates to seal the side port 10, and the control injection part 9 is started to inject the next round of zooplankton removal solution; Step 4: After the injection is allowed to stand, the rotating cylinder 31 is rotated again, and the side port 10 is opened, and the active zooplankton in the rotating cylinder 31 is moved out again, and the broken, dead and inactive zooplankton is retained in the middle cylinder 2; Step 5: Open the No. 1 hole 13 and the No. 2 hole 14 to realize the extraction of the separated solution, and obtain the purified active zooplankton mixed solution and the dead and inactive zooplankton mixed solution.

[0039] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A zooplankton bait separation and purification device, comprising a separation box (1), characterized in that: The interior of the separation box (1) is fixedly connected to an intermediate cylinder (2), a sealing assembly (3) is provided inside the intermediate cylinder (2), a feeding assembly (6) is provided above the separation box (1), a primary separation section (7) is provided above the feeding assembly (6), a control motor (4) is provided at the bottom of the separation box (1), the control motor (4) controls the rotation of the sealing assembly (3), a side opening (10) is provided on the outer side surface of the intermediate cylinder (2), and a control liquid injection section (9) is provided at the bottom of the primary separation section (7). The bottom of the feeding assembly (6) is fixedly connected to an injection assembly (8), the injection assembly (8) comprising an injection pipe (81), an injection hole (82) and a solenoid valve (83), the injection hole (82) being arranged on the outside of the injection pipe (81), the injection pipe (81) being connected to the feeding assembly (6), the injection assembly (8) being located on the outside of the intermediate cylinder (2), and the feeding assembly (6) storing an attractant.

2. The zooplankton bait separation and purification device according to claim 1, characterized in that: The feeding assembly (6) comprises a connecting ring (61), a supporting rod (62), a feeding barrel (63) and a curved tube (64); the supporting rod (62) is fixed on the top of the connecting ring (61); the feeding barrel (63) is located above the side of the connecting ring (61); the curved tube (64) is fixedly connected between the connecting ring (61) and the feeding barrel (63); and the feeding barrel (63) is connected to the connecting ring (61) via the curved tube (64).

3. The zooplankton bait separation and purification device according to claim 2, characterized in that: The injection pipe (81) is fixedly connected to the bottom of the communication ring (61) and is in communication with the interior of the communication ring (61); the solenoid valve (83) is fixedly mounted on the top of the injection pipe (81).

4. The zooplankton bait separation and purification device according to claim 3, characterized in that: The attractant is composed of one or any one of nutrients and chemical attractants.

5. The zooplankton bait separation and purification device according to claim 4, characterized in that: The sealing assembly (3) comprises a rotating cylinder (31), an intermediate plate (32), a rotating shaft (33) and an adaptor (34); the intermediate plate (32) is fixedly connected to the rotating cylinder (31); the rotating cylinder (31) is rotatably sleeved inside the intermediate cylinder (2); the adaptor (34) is provided on the outer surface of the rotating cylinder (31); the adaptor (34) corresponds to the side opening (10) in a one-to-one manner; the side opening (10) is located on the rotation path of the adaptor (34); the rotating shaft (33) is rotatably mounted on the bottom of the separation box (1); the upper end of the rotating shaft (33) is fixedly connected to the intermediate plate (32); and the lower end of the rotating shaft (33) is fixedly connected to the output shaft of the control motor (4).

6. The zooplankton bait separation and purification device according to claim 5, characterized in that: The primary separation section (7) comprises a top box (71), a filter screen 1 (72) and a filter screen 2 (73), wherein the filter screen 1 (72) and the filter screen 2 (73) are fixedly connected inside the top box (71) from bottom to top, and the top box (71) is fixedly connected to the top of the support rod (62).

7. The zooplankton bait separation and purification device according to claim 6, characterized in that: The control injection portion (9) comprises a bottom tube (91) and a switch valve (92); the bottom tube (91) is fixedly connected to the bottom of the top box (71) and communicates with the interior of the top box (71); the switch valve (92) is fixedly arranged at the bottom of the bottom tube (91) and controls the opening and closing of the lower end of the bottom tube (91).

8. The zooplankton bait separation and purification device according to claim 7, characterized in that: An isolation ring (11) is fixedly connected to the interior of the separation box (1). The isolation rings (11) are evenly spaced and arranged vertically in the separation box (1). A sleeve hole (12) is provided on the top of the isolation ring (11). The sleeve hole (12) is sleeved with an injection pipe (81). The isolation rings (11) and the injection holes (82) are alternately arranged.

9. The zooplankton bait separation and purification device according to claim 8, characterized in that: A temperature sensor (5) extending into the interior of the separation box (1) is fixedly embedded on the outer side surface of the separation box (1); a No. 1 hole (13) and a No. 2 hole (14) are respectively provided at the bottom of the separation box (1); the No. 1 hole (13) and the No. 2 hole (14) are respectively located at the inner and outer sides of the intermediate tube (2); and sealing plugs are provided at the bottoms of the No. 1 hole (13) and the No. 2 hole (14).

10. The separation method of the zooplankton bait separation and purification device according to claim 9, characterized in that: The steps include: Step 1: pouring the liquid mixed with zooplankton to be separated into the primary separation part (7) at a low speed, filtering larger particles and impurities above the filter screen 2 (73), and the filter screen 1 (72) further filtering smaller particles and impurities, and the filtered micro zooplankton is concentrated in the liquid above and below the filter screen 1 (72) in a static state; Step 2: Open the switch valve (92) in the liquid injection control part (9) and control it to open intermittently. When it is opened, the mixed liquid after primary filtration falls into the separation box (1) and is injected into the interior of the intermediate cylinder (2). After the injection is completed, the injection component (8) at the bottom of the feeding component (6) is started, and the solenoid valve (83) in the injection component (8) is opened. The attractant stored in the feeding component (6) is input into the injection pipe (81) and injected into the solution in the separation box (1) along the injection hole (82); Step 3: In the solution containing zooplankton injected into the middle cylinder (2), active zooplankton moves toward the attractant, passes through the side opening (10) and gathers near the injection hole (82). After being attracted for a period of time, the control motor (4) is started to drive the sealing component (3) to rotate, the rotating cylinder (31) rotates to seal the side opening (10), and the control injection part (9) is started to inject the next round of zooplankton removal solution; Step 4: After the injection and the solution is allowed to stand, the rotating cylinder (31) is rotated again, and the side opening (10) is opened, so that the active zooplankton in the rotating cylinder (31) moves out again, and the broken, dead and inactive zooplankton is retained in the middle cylinder (2); Step 5: Open hole No. 1 (13) and hole No. 2 (14) to realize the extraction of the separated solution, thereby obtaining a purified mixed solution of active zooplankton and a mixed solution of dead and inactive zooplankton.

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