Water quality monitoring device for marine cage culture

Abstract

The invention belongs to the technical field of water quality monitoring, and particularly relates to a water quality monitoring device for marine cage culture, which comprises a data acquisition box, an upper computer and a group of observation chains uniformly distributed in a cage, a mounting tubular column is arranged outside the observation chain; the observation chain comprises a main through cable and a group of sensors; the surface of the main through cable is fixedly connected with a bearing cable; the lower end of the bearing cable is fixedly connected with a balancing weight; the upper end of the main communication cable is connected with a watertight connector; according to the invention, simultaneous monitoring of multiple layers of a water body can be realized, more comprehensive water quality condition analysis is provided, data acquired by the sensors on different water layers can be quickly transmitted back into the data acquisition box through the observation chain and the communication cable, the data acquisition box integrates the acquired data, and finally the data is displayed on upper computer software, so that the water quality monitoring system is convenient to use. Therefore, a culturist can accurately know key parameters such as dissolved oxygen distribution, temperature gradient, turbidity and pressure of different water layers in the water body.

Description

Technical Field

[0001] The invention belongs to the technical field of water quality monitoring, in particular to a water quality monitoring device for marine cage aquaculture. Background Art

[0002] Cage aquaculture is a method of aquaculture that involves placing cages in water to culture aquatic animals such as fish and shellfish. This method has the advantages of low investment, quick results, and high yields, and is an important part of the aquaculture industry. However, environmental monitoring and management of cage aquaculture has always been a difficult problem in the industry. Monitoring water quality parameters is crucial to maintaining the health of aquatic animals and improving aquaculture efficiency. Traditional monitoring methods often have problems such as limited monitoring parameters, inability to collect data in real time, difficulty in maintaining monitoring equipment, and inability to adapt to complex and changing water conditions.

[0003] For existing technical solutions, many modern aquaculture monitoring systems have begun to use some high-tech equipment and methods to improve the accuracy and real-time nature of monitoring. For example, some systems continuously monitor basic water quality parameters such as water temperature, dissolved oxygen, and pH value through sensors installed on the cages, and use wireless communication technology to transmit data to the control center. These systems may also include some automatic control functions, such as automatically adjusting the operation of the aeration pump according to the monitored data to maintain good water quality conditions.

[0004] Among these existing technologies, developed countries such as the United States have invented a water quality monitoring system that includes multiple water quality sensors and a central processor. The sensors are used to monitor different water quality parameters and send data wirelessly to the central processor. Although the system provides an integrated water quality monitoring solution and remote real-time access to data, it fails to solve all monitoring challenges, such as adaptability to harsh environmental conditions and cost efficiency issues for long-term operations.

[0005] To this end, the present invention provides a water quality monitoring device for marine cage aquaculture. Summary of the invention

[0006] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0007] The technical solution adopted by the present invention to solve the technical problem is: a water quality monitoring device for marine cage aquaculture described in the present invention comprises a data acquisition box, a host computer and a group of observation chains uniformly distributed inside the cage;

[0008] The observation chain is provided with an installation column on the outside; a groove is provided on one side of the installation column;

[0009] The observation chain includes a main cable and a group of sensors; a load-bearing cable is fixedly connected to the surface of the main cable; a counterweight is fixedly connected to the lower end of the load-bearing cable; a watertight connector is connected to the upper end of the main cable; the data acquisition box and the watertight connector are connected by a communication cable; a group of branch vulcanized female heads are evenly connected to the surface of the main cable through wires; and the sensors are connected to watertight male heads through wires.

[0010] Preferably, the main cable and the load-bearing cable are fixedly connected via a group of rings; the main cable is longer than the load-bearing cable.

[0011] Preferably, a group of floating blocks are evenly distributed on the surface of the main cable and the load-bearing cable, and the floating blocks and sensors are staggered; a group of card slots are evenly distributed on the side of the floating block; a group of card strips are evenly distributed on the inner side of the mounting column, and the card strips are slidably matched with the card slots.

[0012] Preferably, a monitoring groove is provided on one side of the floating block; a plug hole is provided between the monitoring groove and the upper side of the floating block; and a supporting ring is fixedly connected to the bottom of the sensor.

[0013] Preferably, a filter is fixedly connected to the opening of the monitoring slot.

[0014] Preferably, the upper end of the load-bearing cable is fixedly connected to a floating body.

[0015] Preferably, a fixed plate is fixedly connected to the top of the floating body; a floating plate is slidably connected to the outside of the floating body; an elastic air storage ring is fixedly connected between the floating plate and the fixed plate; an air cavity is opened inside the floating block; the load-bearing cable is designed to be a hollow structure, and the air storage ring and the air cavity are connected by the load-bearing cable; an elastic eardrum is fixedly connected to the inside of the monitoring slot; a closed gap is formed between the eardrum and the floating block and an elastic part is fixedly connected; a guide hole is provided between the air cavity and the eardrum.

[0016] Preferably, a slide groove is provided between the air cavity and the monitoring groove, and the slide groove is located at the bottom of the socket; a movable plate is slidably connected inside the slide groove; and a tension spring is fixedly connected between the movable plate and the slide groove.

[0017] Preferably, a magnetic block is fixedly connected to the top of the monitoring slot; a guide slot is provided at one end of the movable plate close to the magnetic block; a guide block is slidably connected inside the guide slot, and magnetic repulsion occurs when the guide block and the magnetic block are close to each other; an elastic water-absorbing block is provided between the guide block and the guide slot; a water inlet hole is provided inside the guide block; and a group of water outlet holes are evenly distributed between the guide slot and the upper side of the movable plate.

[0018] Preferably, one end of the water absorbing block close to the guide block is designed to be inclined; a water stop plate is hingedly connected to one side of the guide block close to the water absorbing block; and a compression spring is fixedly connected between the water stop plate and the guide block.

[0019] The beneficial effects of the present invention are as follows:

[0020] 1. Multi-level water body monitoring technology: The present invention adopts layered observation technology, which can realize simultaneous monitoring of multiple levels of water bodies, collect water quality data from different horizontal positions from the surface to the bottom, and provide a more comprehensive water quality analysis. The data collected by sensors on different water layers can be quickly transmitted back to the data acquisition box through the observation chain and communication cables. The data acquisition box integrates the collected data and finally displays it on the host computer software. This helps farmers accurately understand the key parameters such as dissolved oxygen distribution, temperature gradient, turbidity, pressure, etc. in different water layers in the water body, so as to make more reasonable regulation decisions.

[0021] 2. Quick repair and maintenance design: The present invention fully considers the convenience of repair and maintenance during its design, and adopts a modular design, so that sensors and other key components can be quickly disassembled and replaced, which greatly reduces the equipment downtime caused by repair and maintenance and improves the operational efficiency of the farm.

[0022] 3. Advanced anti-fouling algae attachment technology: Through the anti-fouling design of the present invention, the sensor is automatically cleaned during the working process, which effectively slows down the attachment speed of aquatic organisms and dirt, extends the cleaning and maintenance cycle, and ensures the long-term accuracy of the data.

[0023] 4. Strong environmental adaptability: The design of the observation chain system fully considers the differences in different aquaculture environments and has good environmental adaptability. Whether it is freshwater aquaculture or seawater aquaculture, the present invention can provide stable and reliable performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will be further described below in conjunction with the accompanying drawings.

[0025] Figure 1 is a stereogram of the present invention;

[0026] Figure 2 It is a structural schematic diagram of the installation column in the present invention;

[0027] Figure 3 It is a schematic diagram of the top structure of the installation column in the present invention;

[0028] Figure 4 It is a schematic diagram of the structure of the observation chain in the present invention;

[0029] Figure 5 yes Figure 4 A partial enlarged view of the middle part;

[0030] Figure 6 is a partial cross-sectional view of the installation column in the present invention;

[0031] Figure 7 yes Figure 6 A partial enlarged view of point B in the middle;

[0032] Figure 8 yes Figure 7 A partial enlarged view of point C in the middle.

[0033] In the figure: observation chain 1, installation column 2, slot 3, main cable 4, sensor 5, load-bearing cable 6, counterweight 7, watertight connector 8, communication cable 9, branch vulcanized female head 10, watertight male head 11, collar 12, floating block 13, slot 14, card strip 15, monitoring slot 16, jack 17, support ring 18, filter 19, float 20, fixed plate 21, floating plate 22, air storage ring 23, air cavity 24, eardrum 25, elastic part 26, guide hole 27, slide 28, movable plate 29, tension spring 30, magnetic block 31, guide groove 32, guide block 33, water absorption block 34, water inlet hole 35, water outlet hole 36, water stop plate 37, compression spring 38. DETAILED DESCRIPTION

[0034] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0035] like Figures 1 to 8 As shown, a water quality monitoring device for marine cage aquaculture according to the present invention comprises a data acquisition box, a host computer and a group of observation chains 1 uniformly distributed inside the cage;

[0036] The observation chain 1 is provided with a mounting column 2 on the outside; a slot 3 is provided on one side of the mounting column 2; the observation chain 1 is protected by the mounting column 2, and water enters the mounting column 2 through the slot 3, so that the sensor 5 can detect the water quality;

[0037] The observation chain 1 includes a main cable 4 and a group of sensors 5, and the sensors 5 are aligned with the slots 3; a load-bearing cable 6 is fixedly connected to the surface of the main cable 4; a counterweight 7 is fixedly connected to the lower end of the load-bearing cable 6; a watertight connector 8 is connected to the upper end of the main cable 4; the data acquisition box and the watertight connector 8 are connected through a communication cable 9; a group of branch vulcanized female heads 10 are evenly connected to the surface of the main cable 4 through wires; the sensor 5 is connected to a watertight male head 11 through wires, and the branch vulcanized female heads 10 are respectively connected to the watertight male heads 11;

[0038] The data acquisition box is connected to the observation chain 1 through the communication cable 9 and provides power to the sensor 5. The data acquisition and upload of the sensor 5 are realized through the communication interface. The data acquisition box provides an Ethernet interface to the outside, and the host computer reads the data of the sensor 5 through the MODBUS-TCP protocol;

[0039] The water quality data detected by the sensor 5 include but are not limited to indicators such as water temperature, dissolved oxygen, turbidity, and pressure. For example, an RDO dissolved oxygen sensor 5 and a multi-parameter sensor 5 can be used. The RDO dissolved oxygen sensor 5 can detect dissolved oxygen concentration and temperature, and the multi-parameter sensor 5 can detect dissolved oxygen concentration, turbidity, temperature, and pressure.

[0040] The cage aquaculture water quality monitoring and observation chain technology designed by the present invention is intended to solve the following existing technical problems:

[0041] 1) Limitations of underwater observation parameters: Existing cage aquaculture observation chain technology can often only monitor environmental parameters of a limited single water surface, resulting in an inability to fully understand the multi-level underwater environmental conditions; the present invention performs segmented hot vulcanization treatment on the cage comprehensive observation chain 1, which not only ensures that sensors 5 can be connected at different levels, but also ensures the watertightness of the connection, so that the cage comprehensive observation chain 1 can cover a wider underwater environment and provide multi-dimensional and multi-level cage environment analysis, including but not limited to key indicators such as water temperature, dissolved oxygen, turbidity, and pressure, to ensure that farmers can have a comprehensive understanding of the aquaculture environment;

[0042] 2) Defects of real-time data reading: the existing cage aquaculture observation chain technology cannot provide real-time environmental monitoring data and cannot respond to rapidly changing water quality conditions in a timely manner; the sensors 5 connected to the observation chain 1 in the present invention can detect water quality data in real time and send it to the data acquisition box in real time through the communication cable 9. In the entire comprehensive observation chain 1 data transmission system, the MODBUS-TCP data transmission protocol is used to realize the real-time collection and transmission of the monitoring data of the cage comprehensive observation chain 1, so that the breeder can obtain the latest environmental information in a timely manner and make corresponding aquaculture management decisions in a timely manner;

[0043] 3) Accuracy and stability of monitoring equipment: Existing monitoring equipment is often interfered by external factors such as water flow changes, which affects the accuracy of data and the reliability of equipment; the present invention uses a highly accurate sensor 5 to ensure that accurate and reliable observation data can be provided even in complex environments;

[0044] 4) Operation cost and maintenance difficulty: Traditional cage aquaculture observation chain monitoring systems are often accompanied by high maintenance costs and frequent manual inspections; the present invention designs an observation module assembly that is easy to maintain. During installation, the observation chain 1 is placed inside the installation column 2. During maintenance, the observation chain 1 is pulled upward from the inside of the installation column 2 through the load-bearing cable 6. If a sensor 5 is found to be damaged or needs to be cleaned, it can be removed and reinstalled, which reduces the maintenance difficulty and cost;

[0045] 5) Difficulty in data integration and application: The existing cage aquaculture observation chain system has deficiencies in data processing, integration and application, which limits the scope and depth of data application in aquaculture management. The present invention provides an integrated data management platform that can not only integrate various monitoring data, but also conduct in-depth analysis of the data to provide a scientific basis for aquaculture management.

[0046] As a preferred embodiment of the present invention, the main communication cable 4 and the load-bearing cable 6 are fixedly connected by a set of rings 12; the length of the main communication cable 4 is greater than the load-bearing cable 6. Since the load-bearing cable 6 is shorter, during the process of pulling the observation chain 1, only the load-bearing cable 6 is subjected to tensile stress, while the main communication cable 4 is not subjected to tension, thereby preventing it from being damaged by force, improving the reliability of the entire data transmission path, and ensuring the normal progress of the monitoring work.

[0047] As a preferred embodiment of the present invention, a group of floating blocks 13 are evenly distributed on the surface of the main cable 4 and the load-bearing cable 6, and the floating blocks 13 are staggered with the sensors 5; a group of card slots 14 are evenly distributed on the side of the floating blocks 13; a group of card strips 15 are evenly distributed on the inner side of the installation column 2, and the card strips 15 slide and cooperate with the card slots 14. By setting multiple floating blocks 13 to separate multiple sensors 5, the buoyancy of the floating blocks 13 generates an upward pulling force on the observation chain 1, so that the observation chain 1 is kept vertical as much as possible, thereby ensuring that each sensor 5 is at a detection position at a predetermined depth, improving the monitoring accuracy of the device, and during installation, the floating blocks 13 are sequentially placed inside the installation column 2, so that the card strips 15 are aligned with the card slots 14 to limit the floating blocks 13, and then in the process of the counterweight block 7 driving the observation chain 1 to move downward, the direction of the entire observation chain 1 will not change, so that the sensor 5 is always facing the slot 3 for subsequent water quality detection.

[0048] As a preferred embodiment of the present invention, a monitoring groove 16 is provided on one side of the float 13; a socket 17 is provided between the monitoring groove 16 and the upper side of the float 13; and a support ring 18 is fixedly connected to the bottom of the sensor 5. After the branch vulcanized female head 10 is connected to the watertight male head 11, the bottom of the sensor 5 is inserted into the socket 17 so that the support ring 18 is placed on the surface of the float 13. The float 13 is used to support the sensor 5 to prevent the wire and the male and female heads from being pulled and damaged by the gravity of the sensor 5, thereby extending their service life. The detection end at the bottom of the sensor 5 is located inside the monitoring groove 16, so that the water quality is observed through the monitoring groove 16.

[0049] A filter screen 19 is fixedly connected to the opening of the monitoring tank 16 to filter large-sized debris in the water to prevent it from entering the monitoring tank 16 and causing blockage, thereby ensuring that the sensor 5 can work normally.

[0050] As a preferred embodiment of the present invention, the upper end of the load-bearing cable 6 is fixedly connected with a buoy 20 , and the buoy 20 floats on the water surface to further pull the entire observation chain 1 upward to improve the verticality of the observation chain 1 .

[0051] A fixed plate 21 is fixedly connected to the top of the float 20; a floating plate 22 is slidably connected to the outside of the float 20; an elastic air storage ring 23 is fixedly connected between the floating plate 22 and the fixed plate 21; an air cavity 24 is opened inside the floating block 13; the load-bearing cable 6 is designed to be a hollow structure, and the air storage ring 23 and the air cavity 24 are connected through the load-bearing cable 6; an elastic eardrum 25 is fixedly connected inside the monitoring slot 16; a closed gap is formed between the eardrum 25 and the floating block 13 and an elastic member 26 is fixedly connected; a guide hole 27 is provided between the air cavity 24 and the eardrum 25. The float 22 rises and falls with the waves on the water surface and slides up and down on the outside of the float 20, thereby intermittently squeezing the air storage ring 23, and squeezing the air inside the air storage ring 23 into the air cavity 24 of the multiple floating blocks 13 through the load-bearing cable 6, so that the air pressure inside the air cavity 24 increases, and the tympanic membrane 25 is continuously agitated through the guide hole 27 to push the water inside the monitoring tank 16. On the one hand, water is used to impact the filter screen 19 outward to promote the separation of debris on the surface of the filter screen 19 from it, and prevent the filter screen 19 from being blocked and affecting the water from entering the monitoring tank 16. On the other hand, the agitation of the tympanic membrane 25 promotes the renewal of the water inside the monitoring tank 16, so that the sensor 5 can detect the surrounding water quality information in real time, thereby improving the detection accuracy of the sensor 5.

[0052] As a preferred embodiment of the present invention, a slide groove 28 is provided between the air cavity 24 and the monitoring slot 16, and the slide groove 28 is located at the bottom of the jack 17; a movable plate 29 is slidably connected inside the slide groove 28; and a tension spring 30 is fixedly connected between the movable plate 29 and the slide groove 28. When the air pressure inside the air cavity 24 increases, the movable plate 29 is pushed to slide outside the slide groove 28, and then the movable plate 29 scrapes the detection end surface of the lower side of the sensor 5 to scrape off the dirt adhered to its surface, especially the breeding of aquatic organisms, such as algae, snails, etc., to prevent the detection end of the sensor 5 from being blocked by foreign objects and affecting the detection efficiency.

[0053] As a preferred embodiment of the present invention, a magnetic block 31 is fixedly connected to the top of the monitoring slot 16; a guide slot 32 is provided at one end of the movable plate 29 close to the magnetic block 31; a guide block 33 is slidably connected inside the guide slot 32, and the guide block 33 and the magnetic block 31 are magnetically repelled when they are close to each other; an elastic water-absorbing block 34 is arranged between the guide block 33 and the guide slot 32, and the material of the water-absorbing block 34 can be sponge, foam and other materials; a water inlet hole 35 is provided inside the guide block 33; and a group of water outlet holes 36 are evenly distributed between the guide slot 32 and the upper side of the movable plate 29. In the process of the movable plate 29 moving toward the magnetic block 31, when the guide block 33 approaches the magnetic block 31, it is subjected to the magnetic repulsive force thereof, which prompts the guide block 33 to slide in the opposite direction inside the guide slot 32 and squeeze the water-absorbing block 34, and the water inside the water-absorbing block 34 is sprayed upward through a plurality of water outlet holes 36, and the detection end face of the sensor 5 is washed, and the impurities adhering to the surface are further impacted and separated, thereby improving the cleanliness of the sensor 5.

[0054] One end of the water absorbing block 34 close to the guide block 33 is designed to be inclined; a water stop plate 37 is hingedly connected to one side of the guide block 33 close to the water absorbing block 34; a compression spring 38 is fixedly connected between the water stop plate 37 and the guide block 33. When the guide block 33 squeezes the water absorbing block 34, the water stop sheet 37 is squeezed by the water absorbing block 34 and deflected toward the water inlet hole 35, and then the water stop sheet 37 fits the surface of the guide block 33 and blocks the water inlet hole 35, so that all the water squeezed out of the water absorbing block 34 is discharged through the water outlet hole 36 instead of overflowing through the water inlet, thereby improving the water utilization rate and the cleaning strength of the sensor 5. When the subsequent tension spring 30 drives the movable plate 29 to reset and move away from the magnetic block 31, the water absorbing block 34 automatically elastically recovers and pushes the guide block 33 to slide to the opening of the guide groove 32. At this time, the compression spring 38 pushes the water stop sheet 37 to fit the inclined surface of the water absorbing block 34, and an angle is formed between the water stop sheet 37 and the guide block 33, and the water inlet hole 35 is no longer blocked, so that the external water can enter the inside of the guide groove 32 through the water inlet hole 35, so that the inside of the water absorbing block 34 is filled with water again.

[0055] The above-mentioned front, back, left, right, top and bottom are all based on the figures in the specification. Figure 1 As a benchmark, according to the person's observation perspective, the side of the device facing the observer is defined as the front, the left side of the observer is defined as the left, and so on.

[0056] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the scope of protection of the present invention.

[0057] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A water quality monitoring device for marine cage aquaculture, characterized by: It includes a data acquisition box, a host computer and a set of observation chains (1) evenly distributed inside the cage; The observation chain (1) is provided with a mounting column (2) on the outside; a slot (3) is provided on one side of the mounting column (2); The observation chain (1) comprises a main communication cable (4) and a group of sensors (5); a load-bearing cable (6) is fixedly connected to the surface of the main communication cable (4); a counterweight (7) is fixedly connected to the lower end of the load-bearing cable (6); a watertight connector (8) is connected to the upper end of the main communication cable (4); the data acquisition box and the watertight connector (8) are connected via a communication cable (9); a group of branch vulcanized female connectors (10) are evenly connected to the surface of the main communication cable (4) via wires; and the sensors (5) are connected to watertight male connectors (11) via wires.

2. A water quality monitoring device for marine cage aquaculture according to claim 1, characterized in that: The main cable (4) and the load-bearing cable (6) are fixedly connected via a set of rings (12); the main cable (4) is longer than the load-bearing cable (6).

3. A water quality monitoring device for marine cage aquaculture according to claim 1, characterized in that: A group of floating blocks (13) are evenly distributed on the surface of the main cable (4) and the load-bearing cable (6), and the floating blocks (13) and the sensors (5) are staggered; a group of card slots (14) are evenly distributed on the side of the floating blocks (13); a group of card strips (15) are evenly distributed on the inner side of the installation column (2), and the card strips (15) are slidably matched with the card slots (14).

4. A water quality monitoring device for marine cage aquaculture according to claim 3, characterized in that: A monitoring groove (16) is provided on one side of the floating block (13); a plug hole (17) is provided between the monitoring groove (16) and the upper side of the floating block (13); and a supporting ring (18) is fixedly connected to the bottom of the sensor (5).

5. A water quality monitoring device for marine cage aquaculture according to claim 4, characterized in that: A filter screen (19) is fixedly connected to the opening of the monitoring slot (16).

6. A water quality monitoring device for marine cage aquaculture according to claim 4, characterized in that: The upper end of the load-bearing cable (6) is fixedly connected to a floating body (20).

7. A water quality monitoring device for marine cage aquaculture according to claim 6, characterized in that: The top of the floating body (20) is fixedly connected to a fixed plate (21); the outer side of the floating body (20) is slidably connected to a floating plate (22); an elastic air storage ring (23) is fixedly connected between the floating plate (22) and the fixed plate (21); an air cavity (24) is provided inside the floating block (13); the load-bearing cable (6) is designed as a hollow structure, and the air storage ring (23) and the air cavity (24) are connected through the load-bearing cable (6); an elastic eardrum (25) is fixedly connected inside the monitoring groove (16); a closed gap is formed between the eardrum (25) and the floating block (13) and an elastic member (26) is fixedly connected; a guide hole (27) is provided between the air cavity (24) and the eardrum (25).

8. A water quality monitoring device for marine cage aquaculture according to claim 7, characterized in that: A slide groove (28) is provided between the air cavity (24) and the monitoring groove (16), and the slide groove (28) is located at the bottom of the insertion hole (17); a movable plate (29) is slidably connected inside the slide groove (28); and a tension spring (30) is fixedly connected between the movable plate (29) and the slide groove (28).

9. A water quality monitoring device for marine cage aquaculture according to claim 8, characterized in that: A magnetic block (31) is fixedly connected to the top of the monitoring slot (16); a guide slot (32) is provided at one end of the movable plate (29) close to the magnetic block (31); a guide block (33) is slidably connected inside the guide slot (32), and the guide block (33) and the magnetic block (31) are magnetically repelled when they are close to each other; an elastic water-absorbing block (34) is provided between the guide block (33) and the guide slot (32); a water inlet hole (35) is provided inside the guide block (33); and a group of water outlet holes (36) are evenly distributed between the guide slot (32) and the upper side of the movable plate (29).

10. A water quality monitoring device for marine cage aquaculture according to claim 9, characterized in that: One end of the water absorbing block (34) close to the guide block (33) is designed to be inclined; a water stop plate (37) is hingedly connected to one side of the guide block (33) close to the water absorbing block (34); and a compression spring (38) is fixedly connected between the water stop plate (37) and the guide block (33).

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