Ultrasonic-based benthic invertebrate screening device and method

Abstract

This invention discloses an ultrasonic-based benthic invertebrate screening device, comprising: a pre-screening chamber; an ultrasonic component I; multiple high-definition cameras I; a display screen I; a controller I; a main screening chamber; an ultrasonic component II; multiple high-definition cameras II; a controller II; and a rinsing assembly including at least two nozzles detachably mounted on top of the main screening chamber; and a pump. This invention also provides a screening method using the ultrasonic-based benthic invertebrate screening device, which enables precise and efficient screening of marine benthic invertebrates in samples, effectively avoiding damage to marine benthic invertebrates caused by manual sorting and improving screening efficiency.

Description

Technical Field

[0001] This invention relates to the field of benthic invertebrate screening technology, and particularly to an ultrasonic-based benthic invertebrate screening device and screening method. Background Technology

[0002] In fields such as marine aquatic ecology research, aquaculture, and environmental monitoring, accurate screening of benthic invertebrates is often required. Traditional screening methods mainly rely on netting and manual sorting, which are not only inefficient but also prone to damaging marine benthic invertebrates, affecting subsequent research and applications. The application of ultrasonic technology in the biological field provides a new approach to benthic invertebrate screening, but currently there is no perfect ultrasonic-based screening device or efficient screening method to meet practical needs.

[0003] In summary, there is an urgent need for an ultrasonic-based benthic invertebrate screening device and method to efficiently and safely screen benthic invertebrates. Summary of the Invention

[0004] One object of the present invention is to solve at least the above-mentioned problems and to provide at least the advantages that will be described later.

[0005] Another objective of this invention is to provide an ultrasonic-based screening device for benthic invertebrates.

[0006] Another objective of this invention is to provide a screening method using an ultrasonic-based benthic invertebrate screening device. This screening method enables precise and efficient screening of benthic invertebrates in samples, effectively avoiding damage to benthic invertebrates caused by manual sorting and improving screening efficiency. The screening method provided by this invention fully utilizes an ultrasonic-based benthic invertebrate separation device for pre-screening and final precise screening of benthic invertebrates in samples. It eliminates the need for manual sorting, preventing damage and loss of benthic invertebrates in the samples, effectively improving sorting accuracy, and maximizing the quantity sorted.

[0007] To achieve these objectives and other advantages according to the present invention, an ultrasound-based benthic invertebrate screening device is provided, comprising:

[0008] The pre-screening compartment is an open-ended cavity. A pair of end screens I are detachably mounted at both ends of the pre-screening compartment. A pair of longitudinal screens extend along the length of the pre-screening compartment and are positioned in the middle, dividing it into three independent spaces. Multiple transverse screens are evenly spaced within the pair of longitudinal screens, forming multiple sieve baskets I between them. One sieve basket I, located closer to one end of the pre-screening compartment, serves as the sample basket I, while the remaining sieve baskets I form multiple graded sieve baskets I. The aperture size of the graded sieve baskets I gradually decreases from one end of the pre-screening compartment to the other, with the pair of end screens I having the smallest aperture. The sieve aperture of the sieve basket I with the smallest relative sieve aperture among multiple sieve baskets I; sieve frame cover I, which is detachably fastened to the upper opening of multiple sieve baskets I; ultrasonic component I, which is set inside sample basket I, and the ultrasonic transmitting end I of ultrasonic component I extends into the water body inside sample basket I; multiple high-definition cameras I, which are respectively set above multiple sieve baskets I; display screen I, which is communicatively connected to multiple high-definition cameras I; controller I, which is communicatively connected to ultrasonic component I, multiple high-definition cameras I and display screen I, and controller I is used to control the ultrasonic component I to emit ultrasonic waves of different frequencies and intensities, and controller I is also used to control the activation of multiple high-definition cameras I and display screen I;

[0009] The system comprises: a main screening chamber with two side openings at each end; a pair of end screens II, detachably mounted on the two side openings; multiple sieve baskets II, nested sequentially from largest to smallest, with the sieve aperture diameter increasing progressively; the side walls of adjacent sieve baskets II not contacting each other; the smallest sieve basket II serving as the sample basket II; a sieve basket cover II detachably attached to the sieve baskets II; an ultrasonic component II including multiple ultrasonic transmitters II dispersed on the sample basket II, each extending into the water within the sample basket II; multiple high-definition cameras II, each positioned above the sieve baskets II; a display screen II communicatively connected to the multiple high-definition cameras II; and a controller II communicatively connected to the ultrasonic component II, the multiple high-definition cameras II, and the display screen II. The controller II controls the ultrasonic component II to emit ultrasonic waves of different frequencies and intensities, and also controls the activation of the multiple high-definition cameras II and the display screen II.

[0010] The rinsing assembly includes at least two nozzles detachably mounted on top of the main screening chamber, with the tips of the at least two nozzles extending into sample basket II; a pump whose outlet is connected to the at least two nozzles via a water pipe, and whose inlet is connected to a water inlet pipe.

[0011] Preferably, in the pre-screening chamber, there are two water flow channels on both sides of a pair of longitudinal screens, and the width of either water flow channel is less than the vertical distance between the pair of longitudinal screens.

[0012] Preferably, the distance between the side wall of sample basket II and the side wall of an adjacent step-by-step sieving frame II is A, the distance between two adjacent step-by-step sieving frames II is B, and A > B.

[0013] Preferably, the bottoms of the multiple screen baskets II do not contact each other, and the bottoms of the multiple screen baskets II are respectively spaced apart by multiple U-shaped support rods.

[0014] Preferably, it also includes: a bottom compartment, which is a hollow structure compartment, the bottom compartment also includes a water inlet, which is located at the upper end of the bottom compartment; and a drain outlet, which is located on the side wall near the bottom of the bottom compartment.

[0015] The outlet is located at the bottom of the main screening chamber, which is detachably placed on the bottom chamber, and the outlet of the main screening chamber is positioned directly opposite the inlet of the bottom chamber.

[0016] A valve, which is located at the water outlet;

[0017] The drain pipe has one end connected to the drain outlet of the bottom compartment, and the other end extends outward.

[0018] Preferably, it also includes: multiple support legs, which are respectively installed on the side walls of the pre-screening bin and the main screening bin, and the multiple support legs on the main screening bin do not contact each other with the bottom bin;

[0019] Multiple lifting rings are respectively installed on the side walls of the pre-screening compartment and the main screening compartment.

[0020] Preferably, it also includes:

[0021] Door I is located on the side wall of the pre-screening compartment, and the size of Door I is larger than that of any longitudinal screen. Any longitudinal screen close to Door I is detachable by a snap fastener.

[0022] Door II is located on the side wall of the main screening chamber. Door II is larger than the outermost screen frame II. The first side walls of multiple screen frames II that are close to Door II are detachable by snap-fit ​​and can be opened step by step.

[0023] A screening method for benthic invertebrates using an ultrasound-based screening device includes the following steps:

[0024] Step 1: Preprocess the collected samples containing benthic invertebrates;

[0025] Step 2: Place the pre-treated sample in the pre-screening chamber and place the pre-screening chamber in the water body at the sample collection site, so that the water flows in from one end of the pre-screening chamber and flows out from the other end. Then, control the ultrasonic component I to start through controller I, and control the ultrasonic frequency and vibration power to be adjusted at least every 5 minutes. Controller I acquires image information from multiple high-definition cameras I in real time, and analyzes and compares the images with the benthic invertebrate classification data pre-stored in controller I to obtain the comparison results. Based on the comparison results, obtain the species and quantity of benthic invertebrates in the sample, screen and record the ultrasonic frequency and vibration power parameters corresponding to different species of benthic invertebrates, as well as the corresponding ultrasonic action time period.

[0026] Step 3: Repeat Step 1 to Step 2 three times to obtain the relatively optimal ultrasonic frequency and vibration power parameters, as well as the corresponding dataset of ultrasonic action time periods.

[0027] Step 4: Pre-store the relatively optimal ultrasonic frequency and vibration power parameters, as well as the corresponding ultrasonic action time period data, into controller II.

[0028] Step 5: Repeat step 1;

[0029] Step 6: Place the sample collected in Step 5 into the main screening chamber, and place the main screening chamber into the water body at the sampling point of the sample. Make sure that water flows into the self-screening chamber at one end and flows out at the other end. Activate the ultrasonic component II through controller II to emit ultrasonic waves according to the pre-stored dataset.

[0030] Step 7: Remove the main screening chamber from the water body after step 6. Then, start the flushing assembly to flush the sample for at least 5 minutes. After that, put the main screening chamber back into the water body at the sampling point of the sample, so that one end of the water body flows into the self-screening chamber and the other end flows out.

[0031] Step 8: Activate ultrasonic component II via controller II to emit ultrasonic waves according to the pre-stored dataset;

[0032] Step 9: Remove the main screening chamber from the water body in Step 8, and take out or open multiple screen baskets II in sequence to collect the benthic invertebrates in the multiple screen baskets II in sequence.

[0033] Step 10: Repeat steps 5 through 9 at least twice.

[0034] Preferably, the pretreatment of the sample in step one is to remove non-biological impurities from the sample.

[0035] Preferably, the frequency of the ultrasound is 20 kHz – 50 kHz, and the vibration power of the ultrasound is 100 W – 500 W.

[0036] The present invention has at least the following beneficial effects:

[0037] The ultrasonic-based benthic invertebrate separation device provided by this invention can scientifically pre-screen samples to obtain optimized ultrasonic data. Then, through the main screening chamber, a large number of samples are precisely and efficiently screened for benthic invertebrates, effectively avoiding damage to benthic invertebrates caused by manual sorting and improving screening efficiency. The screening method provided by this invention fully utilizes the ultrasonic-based benthic invertebrate separation device for pre-screening and final precise screening of benthic invertebrates in the samples, eliminating the need for manual sorting and preventing damage or loss of benthic invertebrates in the samples. This effectively improves sorting accuracy and maximizes the number of samples sorted.

[0038] Other advantages, objectives and features of the present invention will become apparent in part from the following description, and in part from those skilled in the art through study and practice of the invention. Attached Figure Description

[0039] Figure 1 This is a top view of the pre-screening compartment in one embodiment of the present invention;

[0040] Figure 2 This is a top view of the main screening chamber in one embodiment of the present invention;

[0041] Figure 3 This is a side view of the main screening chamber in one embodiment of the present invention;

[0042] Figure 4 This is a side view of the main screening chamber in another embodiment of the present invention;

[0043] Figure 5 This is a schematic diagram of the main screening chamber and the bottom chamber in another embodiment of the present invention;

[0044] Figure 6 This is a side view of the main screening chamber and the bottom chamber in another embodiment of the present invention. Detailed Implementation

[0045] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0046] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not imply the presence or addition of one or more other elements or combinations thereof.

[0047] like Figure 1 ,2 As shown in Figure 3, the present invention provides an ultrasonic-based benthic invertebrate screening device, comprising:

[0048] The pre-screening chamber 10 is a receiving cavity open at both ends; a pair of end screens I are detachably installed at the two end openings of the pre-screening chamber; a pair of longitudinal screens 101 extend along the length of the pre-screening chamber and are installed in the middle of the pre-screening chamber, dividing the pre-screening chamber into three independent spaces; multiple transverse screens 102 are evenly spaced within the pair of longitudinal screens to form multiple screen baskets I between the pair of longitudinal screens and the multiple transverse screens, relatively close to one end of the pre-screening chamber. One sieve frame I is a sample basket I 103, and the remaining multiple sieve frames I are multiple graded sieve baskets I 104. From one end of the pre-screening compartment to the other, the aperture diameter of the sieve holes in the graded sieve baskets I gradually decreases, and the aperture diameter of a pair of end sieves I is smaller than the aperture diameter of the graded sieve basket I with the smallest relative aperture. A sieve frame cover I is detachably fastened to the upper opening of the multiple sieve baskets I. An ultrasonic component I 105 is installed inside the sample basket I and is used for ultrasonic... The ultrasonic transmitter I1051 of the wave assembly I extends into the water body within the sample basket I; multiple high-definition cameras I106 are respectively positioned above multiple sieve baskets I; a display screen I107 is communicatively connected to the multiple high-definition cameras I; a controller I108 is communicatively connected to the ultrasonic assembly I, the multiple high-definition cameras I, and the display screen I. The controller I is used to control the activation of the ultrasonic assembly I to emit ultrasonic waves of different frequencies and intensities, and also to control the activation of the multiple high-definition cameras I and the display screen I; before starting pre-screening, data on the types and size ranges of common benthic invertebrates in the target water body, along with the corresponding approximate ultrasonic data ranges, can be consulted and pre-stored in the database within the controller I, providing a data foundation and comparative analysis library for pre-screening, thereby improving pre-screening efficiency; in the pre-screening chamber, multiple tiered sieve baskets I are set up to promote the gradual diffusion of benthic invertebrates in one direction, quickly obtaining screening results and improving the optimization efficiency of ultrasonic data;

[0049] The main screening chamber 20 has two side openings at both ends; a pair of end screens II are detachably mounted on the two side openings; the pair of end screens II facilitate water flow into the main screening chamber; multiple screen baskets II 201 are arranged in descending order of size, with the screen apertures of the multiple screen baskets II increasing sequentially from large to small; the side walls of adjacent screen baskets II do not contact each other; the smallest screen basket II is the sample basket II 2011, and the remaining multiple screen baskets II are graded screening baskets II 2012; a screen basket cover II is detachably fastened to the multiple screen baskets II; an ultrasonic component II 202 includes multiple ultrasonic transmitters II 2021 dispersed on the sample basket II, and the multiple ultrasonic transmitters... II. All extend into the water body of sample basket II; multiple high-definition cameras II 203 are respectively set above multiple sieve baskets II; display screen II 204 is communicatively connected to multiple high-definition cameras II; controller II 205 is communicatively connected to ultrasonic component II, multiple high-definition cameras II and display screen II, controller II is used to control the ultrasonic component II to emit ultrasonic waves of different frequencies and intensities, controller II is also used to control the activation of multiple high-definition cameras II and display screen II; and rinsing component 30, which includes at least two nozzles 301, which are detachably set on the top of the main sieving chamber, and the front ends of at least two nozzles extend into sample basket II; pump 302, the water outlet of which is connected to at least two nozzles through a water pipe, and the water inlet of the pump is connected to a water inlet pipe.

[0050] In this scheme, the pre-screening chamber is used to pre-screen benthic invertebrates in different samples. The pre-screening chamber works with ultrasonic component I and controller I to pre-detect and optimize the frequency and intensity of ultrasonic waves of ultrasonic component I, in order to prepare for the subsequent accurate screening of multiple samples in the main screening chamber and effectively improve screening efficiency.

[0051] During the pre-screening process, the real-time reactions of benthic invertebrates, such as changes in movement direction and speed, can be observed manually through display screen I, which helps to optimize ultrasonic data and assist in controlling the pre-screening process; multiple high-definition cameras I and display screen I are also used to monitor whether the equipment is operating normally, ensuring that the pre-screening process proceeds smoothly;

[0052] The main screening chamber is used to further screen benthic invertebrates from a large area of ​​the water body being tested. During the screening process, the sample is first placed in the sample basket II, and then the main screening chamber is placed in the water body with a certain flow rate. Each layer of the screening frame II has a specific aperture so that benthic invertebrates of different sizes can be screened step by step under the action of water flow and ultrasound. When ultrasound acts on the main screening chamber in the water body, the sediment in the sample in the water body gradually vibrates and separates from the benthic invertebrates. The benthic invertebrates are also driven or disturbed by the ultrasound and move towards the outer screening frames II step by step until they reach the screening frames II that cannot be passed through, so as to achieve the purpose of screening benthic invertebrates. In this process, the separated sediment will also be washed into the water body by the water flow. With the cooperation of multiple high-definition cameras II and display screen II, the screening effect can be further conveniently observed manually.

[0053] The rinsing component is used to further process the samples that have been treated with ultrasound for a certain period of time, so as to separate the residual samples and the benthic invertebrates therein, ensuring a more thorough screening effect.

[0054] In summary, the ultrasonic-based benthic invertebrate separation device provided by this invention can scientifically pre-screen samples to obtain optimized ultrasonic data. Then, through the main screening chamber, it performs precise and efficient screening of benthic invertebrates from a large number of samples, effectively avoiding damage to benthic invertebrates caused by manual sorting and improving screening efficiency. In a preferred embodiment, in the pre-screening chamber, two water flow channels are located on both sides of a pair of longitudinal screens, and the width of either water flow channel is less than the vertical distance between the pair of longitudinal screens. The two water flow channels facilitate water flow, ensuring that the water flow environment in the pre-screening chamber remains in the same direction. Simultaneously, it causes sediment separated from the samples to flow quickly out of the pre-screening chamber, assisting the benthic invertebrates to swim in one direction under the influence of ultrasound, thus aiding in the effective screening of benthic invertebrates in the samples.

[0055] like Figure 3 As shown, in a preferred embodiment, the distance between the sidewall of sample basket II and the sidewall of its adjacent step-by-step sieving frame II is A, and the distance between two adjacent step-by-step sieving frames II is B, where A > B. That is, the distance between the first step-by-step sieving frame II and sample basket II is relatively larger. All benthic invertebrates to be sieved in the sample must pass through this space to move outwards. Therefore, this space is relatively large, providing more room for movement for all benthic invertebrates to be sieved in the sample, thereby promoting more efficient sieving.

[0056] like Figure 4As shown, in a preferred embodiment, the bottoms of the multiple screen baskets II do not contact each other, and the bottoms of the multiple screen baskets II are spaced apart by multiple U-shaped support rods 2013. The fact that the bottoms of the multiple screen baskets II do not contact each other further increases the screening activity space in one direction relative to the pre-screening chamber, thereby further improving screening efficiency.

[0057] like Figure 5 As shown, a preferred embodiment further includes: a bottom chamber 40, which is a hollow structure chamber, and the bottom chamber also includes a water inlet 401, which is located at the upper end of the bottom chamber; a drain outlet 402, which is located on the side wall near the bottom of the bottom chamber; a water outlet 206, which is located at the bottom of the main screening chamber, the main screening chamber being detachably placed on the bottom chamber, and the water outlet of the main screening chamber being positioned directly opposite the water inlet of the bottom chamber; a valve 403, which is located at the water outlet; and a drain pipe, one end of which is connected to the drain outlet of the bottom chamber, and the other end of which extends outward. In this embodiment, the bottom chamber cooperates with the rinsing assembly to contain water sprayed from at least two nozzles and impurities and sediment washed down from the sample, facilitating centralized processing. The bottom chamber is detachable, allowing the main screening chamber to be separated from the bottom chamber and placed into the water body.

[0058] like Figure 6 As shown, in a preferred embodiment, it further includes: multiple support legs 50, which are respectively installed on the side walls of the pre-screening chamber and the main screening chamber, and the multiple support legs on the main screening chamber do not contact each other with the bottom chamber; so as to support and fix the pre-screening chamber and the main screening chamber and prevent them from moving in the water; and multiple lifting rings 60, which are respectively installed on the side walls of the pre-screening chamber and the main screening chamber.

[0059] In a preferred embodiment, the device further includes: door I, which is located on the side wall of the pre-screening chamber, and the size of door I is larger than the size of any longitudinal screen, and any longitudinal screen close to door I is detachable by means of a snap fastener; door II, which is located on the side wall of the main screening chamber, and the size of door II is larger than the size of the outermost screen frame II, and the multiple first side walls of multiple screen frames II that are close to door II are detachable by means of a snap fastener and can be opened step by step.

[0060] A screening method for benthic invertebrates using an ultrasound-based screening device includes the following steps:

[0061] Step 1: Preprocess the collected samples containing benthic invertebrates;

[0062] Step 2: Place the pre-treated sample in the pre-screening chamber and place the pre-screening chamber in the water body at the sample collection site, so that the water flows in from one end of the pre-screening chamber and flows out from the other end. Then, control the ultrasonic component I to start through controller I, and control the ultrasonic frequency and vibration power to be adjusted at least every 5 minutes. Controller I acquires image information from multiple high-definition cameras I in real time, and analyzes and compares the images with the benthic invertebrate classification data pre-stored in controller I to obtain the comparison results. Based on the comparison results, obtain the species and quantity of benthic invertebrates in the sample, screen and record the ultrasonic frequency and vibration power parameters corresponding to different species of benthic invertebrates, as well as the corresponding ultrasonic action time period.

[0063] Step 3: Repeat Step 1 to Step 2 three times to obtain the relatively optimal ultrasonic frequency and vibration power parameters, as well as the corresponding dataset of ultrasonic action time periods.

[0064] Step 4: Pre-store the relatively optimal ultrasonic frequency and vibration power parameters, as well as the corresponding ultrasonic action time period data, into controller II.

[0065] Step 5: Repeat step 1;

[0066] Step 6: Place the sample collected in Step 5 into the main screening chamber, and place the main screening chamber into the water body at the sampling point of the sample. Make sure that water flows into the self-screening chamber at one end and flows out at the other end. Activate the ultrasonic component II through controller II to emit ultrasonic waves according to the pre-stored dataset.

[0067] Step 7: Remove the main screening chamber from the water body after step 6. Then, start the flushing assembly to flush the sample for at least 5 minutes. After that, put the main screening chamber back into the water body at the sampling point of the sample, so that one end of the water body flows into the self-screening chamber and the other end flows out.

[0068] Step 8: Activate ultrasonic component II via controller II to emit ultrasonic waves according to the pre-stored dataset;

[0069] Step 9: Remove the main screening chamber from the water body in Step 8, and take out or open multiple screen baskets II in sequence to collect the benthic invertebrates in the multiple screen baskets II in sequence.

[0070] Step 10: Repeat steps 5 through 9 at least twice.

[0071] In this screening method, an ultrasonic-based benthic invertebrate separation device is fully utilized to screen benthic invertebrates in the sample. No manual sorting is required, which will not cause damage or loss to the benthic invertebrates in the sample, effectively improving the sorting accuracy and maximizing the sorting quantity.

[0072] In a preferred embodiment, the sample pretreatment in step one involves removing abiotic impurities from the sample. These abiotic impurities include large stones, branches, and large pieces of plastic waste, etc., and further measurement and recording of basic sample parameters, including water temperature, pH value, turbidity, and dissolved oxygen content.

[0073] In a preferred embodiment, the frequency of the ultrasound is 20 kHz – 50 kHz, and the vibration power of the ultrasound is 100 W – 500 W.

[0074] Example 1

[0075] Samples were collected from river estuaries.

[0076] The samples were pre-screened using a pre-screening chamber. Initially, the ultrasonic data was set to a frequency of 27 kHz – 35 kHz, a vibration power of 300 W – 500 W, and a pulse waveform. Optimized data after pre-screening were obtained: ultrasonic frequency 28 kHz – 32 kHz, ultrasonic vibration power 400 W – 500 W. The screened benthic invertebrate species identified were mollusks, crabs, and polychaetes.

[0077] The main screening chamber was used to sequentially screen 60 samples. In the final screening results, shellfish, crabs, and polychaetes were concentrated in the nested, progressively smaller screening frames (II) from the inside out. Multiple high-definition cameras (II) and a controller (II) were used for image recognition to identify the species. The average number of shellfish was 65, crabs 32, and polychaetes 145. These benthic invertebrates were then collected and their body length and weight were manually measured to provide data for the ecological environment assessment of the estuary.

[0078] Example 2

[0079] Samples were collected from the coastline

[0080] The samples were pre-screened using a pre-screening device. The initial vibration data was set to a frequency of 20 Hz – 26 Hz, a vibration power of 200 W – 300 W, and a pulse waveform. After pre-screening, the optimized data were: vibration power of 18 Hz – 22 Hz, vibration power of 250 W – 300 W. The intertidal organisms found along the coastline were identified as snails, shrimp, and starfish.

[0081] Eighty samples were sequentially screened using the main screening chamber. The final screening results showed that snails, shrimp, and starfish were concentrated in the nested, progressively smaller screening frames (III) from the inside out. Multiple high-definition cameras (III) and a controller (III) were used for image recognition to identify the species. The average number of snails was 80, shrimp 45, and starfish 28. These benthic invertebrates were then collected and their body length and weight were manually measured to provide data for coastal ecological environment assessment.

[0082] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A screening device for benthic invertebrates based on ultrasound, characterized in that, include: The pre-screening compartment is a receiving cavity with openings at both ends; A pair of end screens I, which are detachably installed at both ends of the pre-screening compartment; A pair of longitudinal screens, which extend along the length of the pre-screening compartment and are set in the middle of the pre-screening compartment, divide the pre-screening compartment into three independent spaces; Multiple transverse screens are evenly spaced within a pair of longitudinal screens to form multiple sieve baskets I between the pair of longitudinal screens and the multiple transverse screens. One sieve basket I, relatively closer to the pre-screening compartment, is the sample basket I, and the remaining multiple sieve baskets I are multiple graded sieve baskets I. From one end of the pre-screening compartment to the other end, the sieve aperture of the multiple graded sieve baskets I gradually decreases, and the sieve aperture of the pair of end screens I is smaller than the sieve aperture of the graded sieve basket I with the smallest relative sieve aperture. A sieve basket cover I is detachably fastened to the upper opening of the multiple sieve baskets I. An ultrasonic component I is set inside the sample basket I, and the ultrasonic transmitting end I of the ultrasonic component I extends into the water body inside the sample basket I. Multiple high-definition cameras I are respectively set above the multiple sieve baskets I. Display screen I is connected in communication with multiple high-definition cameras I; controller I is connected in communication with ultrasonic component I, multiple high-definition cameras I and display screen I. Controller I is used to control the ultrasonic component I to emit ultrasonic waves of different frequencies and intensities. Controller I is also used to control the activation of multiple high-definition cameras I and display screen I. The main screening chamber is a receiving cavity with two side openings at both ends; A pair of end screens II, each detachably mounted on two side openings; multiple sieve baskets II, nested sequentially from largest to smallest, with the sieve aperture diameter increasing sequentially; the side walls of adjacent sieve baskets II do not contact each other; the smallest sieve basket II is the sample basket II, and the remaining sieve baskets II are graded sieve baskets II; a sieve basket cover II, detachably fastened to the multiple sieve baskets II; an ultrasonic component II, comprising multiple ultrasonic transmitters II dispersed on the sample basket II, each extending into the water within the sample basket II; and multiple high-definition cameras II, each positioned above the multiple sieve baskets II. Display screen II, which is communicatively connected to multiple high-definition cameras II; Controller II is connected to ultrasonic component II, multiple high-definition cameras II and display screen II. Controller II is used to control the ultrasonic component II to emit ultrasonic waves of different frequencies and intensities. Controller II is also used to control the activation of multiple high-definition cameras II and display screen II. as well as The rinsing assembly includes at least two nozzles detachably mounted on top of the main screening chamber, with the tips of the at least two nozzles extending into the sample basket II. The pump has its outlet end connected to at least two nozzles via a water pipe, and its inlet end connected to a water inlet pipe.

2. The ultrasonic-based benthic invertebrate screening device as described in claim 1, characterized in that, In the pre-screening chamber, there are two water flow channels on both sides of a pair of longitudinal screens, and the width of either water flow channel is less than the vertical distance between the pair of longitudinal screens.

3. The ultrasonic-based benthic invertebrate screening device as described in claim 1, characterized in that, The distance between the side wall of sample basket II and the side wall of its adjacent step-by-step sieving frame II is A, and the distance between two adjacent step-by-step sieving frames II is B, and A > B.

4. The ultrasonic-based benthic invertebrate screening device as described in claim 1, characterized in that, The bottoms of the multiple screen baskets II do not contact each other, and the bottoms of the multiple screen baskets II are respectively set apart from each other by multiple U-shaped support rods.

5. The ultrasonic-based benthic invertebrate screening device as described in claim 1, characterized in that, Also includes: The bottom compartment is a hollow structure compartment, and the bottom compartment also includes a water inlet, which is located at the top of the bottom compartment; The drain outlet is located on the side wall near the bottom of the hopper; The outlet is located at the bottom of the main screening chamber, which is detachably placed on the bottom chamber, and the outlet of the main screening chamber is positioned directly opposite the inlet of the bottom chamber. A valve, which is located at the water outlet; The drain pipe has one end connected to the drain outlet of the bottom compartment, and the other end extends outward.

6. The ultrasonic-based benthic invertebrate screening device as described in claim 5, characterized in that, Also includes: Multiple support legs are respectively installed on the side walls of the pre-screening compartment and the main screening compartment, and the multiple support legs on the main screening compartment do not contact each other with the bottom compartment; Multiple lifting rings are respectively installed on the side walls of the pre-screening compartment and the main screening compartment.

7. The ultrasonic-based benthic invertebrate screening device as described in claim 1, characterized in that, Also includes: Door I is located on the side wall of the pre-screening compartment, and the size of Door I is larger than that of any longitudinal screen. Any longitudinal screen close to Door I is detachable by a snap fastener. Door II is located on the side wall of the main screening chamber. Door II is larger than the outermost screen frame II. The first side walls of multiple screen frames II that are close to Door II are detachable by snap-fit ​​and can be opened step by step.

8. A screening method using the ultrasonic-based benthic invertebrate screening device as described in any one of claims 1-7, characterized in that, Includes the following steps: Step 1: Preprocess the collected samples containing benthic invertebrates; Step 2: Place the pre-treated sample in the pre-screening chamber and place the pre-screening chamber in the water body at the sample collection site, so that the water flows in from one end of the pre-screening chamber and flows out from the other end. Then, control the ultrasonic component I to start through controller I, and control the ultrasonic frequency and vibration power to be adjusted at least every 5 minutes. Controller I acquires image information from multiple high-definition cameras I in real time, and analyzes and compares the images with the benthic invertebrate classification data pre-stored in controller I to obtain the comparison results. Based on the comparison results, obtain the species and quantity of benthic invertebrates in the sample, screen and record the ultrasonic frequency and vibration power parameters corresponding to different species of benthic invertebrates, as well as the corresponding ultrasonic action time period. Step 3: Repeat Step 1 to Step 2 three times to obtain the relatively optimal ultrasonic frequency and vibration power parameters, as well as the corresponding dataset of ultrasonic action time periods. Step 4: Pre-store the relatively optimal ultrasonic frequency and vibration power parameters, as well as the corresponding ultrasonic action time period data, into controller II. Step 5: Repeat step 1; Step 6: Place the sample collected in Step 5 into the main screening chamber, and place the main screening chamber into the water body at the sampling point of the sample. Make sure that water flows into the self-screening chamber at one end and flows out at the other end. Activate the ultrasonic component II through controller II to emit ultrasonic waves according to the pre-stored dataset. Step 7: Remove the main screening chamber from the water body after step 6. Then, start the flushing assembly to flush the sample for at least 5 minutes. After that, put the main screening chamber back into the water body at the sampling point of the sample, so that one end of the water body flows into the self-screening chamber and the other end flows out. Step 8: Activate ultrasonic component II via controller II to emit ultrasonic waves according to the pre-stored dataset; Step 9: Remove the main screening chamber from the water body in Step 8, and take out or open multiple screen baskets II in sequence to collect the benthic invertebrates in the multiple screen baskets II in sequence. Step 10: Repeat steps 5 through 9 at least twice.

9. The screening method of the ultrasonic-based benthic invertebrate screening device as described in claim 8, characterized in that, The pretreatment of the sample in step one is to remove non-biological impurities from the sample.

10. The screening method of the ultrasonic-based benthic invertebrate screening device as described in claim 8, characterized in that, The frequency of ultrasound is 20 kHz – 50 kHz, and the vibration power of ultrasound is 100 W – 500 W.

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