A sea sand desalination apparatus

Abstract

The application provides a sea sand desalination device, and belongs to the technical field of sea sand desalination. The device solves the technical problems of high chlorine content and high mud content in desalinated sea sand, large consumption of fresh water resources or electric power resources and the like of the existing sea sand desalination equipment. The sea sand desalination device comprises a desalination barrel, an inlet sand port and an inlet water port are arranged on the desalination barrel, an outlet sand port is arranged at the lower part of the desalination barrel, a switch device for controlling the outlet sand port is connected to the outlet sand port, a stirring paddle is arranged in the desalination barrel, the stirring paddle is connected to a stirring driving part, a plurality of air blowing holes are arranged at the lower part of the desalination barrel, and the air blowing holes are communicated with a gas supply device. The sea sand is desalinated by stirring and air injection, and the combination of the two greatly improves the desalination effect, so that the chlorine content and the mud content in the desalinated sea sand are lower, no chemical agent needs to be added in the whole desalination process, the energy consumption and the fresh water consumption are less, and the device is more environmentally friendly.

Description

Technical Field

[0001] This invention belongs to the field of sea sand desalination technology, and specifically refers to a sea sand desalination device. Background Technology

[0002] Currently, my country produces approximately 2.5 billion cubic meters of cement concrete annually. Including mortar and other uses, the annual demand for construction sand exceeds 3 billion tons. Due to the limited availability of land-based and freshwater sand resources, the supply of river sand, a key fine aggregate for concrete, is increasingly strained, leading to shortages in many areas. Simultaneously, to prevent excessive exploitation of river sand from causing severe damage to natural landscapes and the ecological environment, various regions have gradually implemented measures to restrict its use. To address this supply-demand imbalance, attention has turned to the oceans, which cover 70.8% of the Earth's surface, making the rational development and utilization of marine sand resources an inevitable choice.

[0003] However, because the chloride ion content in seawater is around 0.3%, the surface and pores of sea sand are covered with a large amount of chloride, which is difficult to remove. The chloride salts in sea sand can cause steel reinforcement to rust, and the passivation film on the surface of the steel reinforcement is destroyed by chemical reaction, which in turn forms corrosion cells on the surface of the steel reinforcement, resulting in electrochemical corrosion. The rust products produced by the continuous corrosion of steel reinforcement increase in volume by 4 to 7 times, which will generate expansion stress around the steel reinforcement. When it accumulates to a certain point, it will cause the concrete protective layer to expand and peel off or the steel reinforcement to crack. In order to improve the service life and structural strength of buildings, sea sand desalination is an essential step in the use of sea sand in construction projects.

[0004] At the same time, sea sand also contains varying degrees of mud (particles with a diameter of less than 75μm in natural sand). A high mud content in the sand can lead to a decrease in concrete strength. Relevant national standards for construction sand also have content requirements for this, which need to be washed and separated during the sea sand desalination process.

[0005] An analysis of domestic and international research progress on sea sand desalination reveals that, addressing the main problem of excessive chlorine content in sea sand, the following are the main sea sand desalination technologies currently used both domestically and internationally:

[0006] 1. Immersion cleaning method: Place sea sand in a pool and soak it in water to remove salt;

[0007] 2. Natural deposition method: Deposition utilizes natural rainwater erosion and weathering;

[0008] 3. Mechanical method: By using mechanical devices to tumble and mix sea sand and fresh water, rapid desalination is achieved.

[0009] 4. Electrolysis method: Sodium chloride is decomposed by electrolysis to achieve desalination;

[0010] 5. Chemical dechlorination method: This method uses chemical substances, such as desalination agents, to react with chloride ions to remove chlorine.

[0011] Among them, the immersion cleaning method and the natural stacking method are gradually being phased out due to their low efficiency and low chloride ion removal rate. The mainstream methods now are mechanical and electrolytic methods.

[0012] Mechanical methods, such as the utility model application with application number 202021636950.0, disclose a sea sand desalination system that cleans sea sand three times through a first, second, and third washing chamber. Each washing process involves high-frequency vibration motors vibrating the sea sand in the water source to remove surface salts through mutual friction. However, this sea sand desalination system can only reduce the chloride ion content in the sea sand to about 0.02%, which is still relatively high. While it can meet the chloride content requirements of some engineering concrete, a chloride ion content of 0.01%-0.02% will still affect the quality of the concrete. This type of sea sand can only be used in concrete with a strength grade below C35, and cannot be used in concrete with a higher strength grade. Furthermore, this method consumes a large amount of water.

[0013] Electrolysis, such as the utility model application with application number 202022796145.0, discloses an electrolytic spiral sea sand desalination and washing machine that decomposes sodium chloride by electrolysis. A variable-distance spiral propels the sea sand flow, controlling the electrolysis distance and time. It uses a small amount of fresh water to achieve sea sand desalination without wastewater pollution. It can be directly applied to beaches lacking fresh water, making it environmentally friendly and clean. The above-mentioned electrolysis method can reduce the chloride ion content in sea sand to about 0.003%, but it consumes a large amount of electricity during operation, which is not environmentally friendly.

[0014] Chemical dechlorination methods, such as the utility model application with application number 201822060691.0, disclose a complete set of sea sand desalination equipment. This method involves adding a desalination agent to a washing drum; after catalytic decomposition by the agent, chloride ion inorganic salt deposits float on the surface of the washing water and are then discharged through the overflow port of an excavator, thus achieving the effect of dechlorination of sea sand. However, the desalination agent and its byproducts added in this method can easily cause environmental pollution, and the desalination effect is poor while requiring a large amount of fresh water.

[0015] The "Standard for Construction Industry of the People's Republic of China JG / T 494-2016" clearly stipulates the requirements for purified sea sand used in construction and municipal engineering. Class I standard is mud content ≤1.0% and chloride ion ≤0.003%; Class II standard is mud content ≤2.0% and chloride ion ≤0.005%. The mechanical washing method mentioned above can meet the Class II standard, but it is still far from the Class I standard, and it consumes a large amount of freshwater resources during operation. Although the electrolysis method mentioned above can meet the Class I standard, it consumes a large amount of electricity during operation.

[0016] In addition, none of the existing sea sand desalination technologies mentioned above can effectively remove mud from sea sand and reduce the mud content of the desalinated sea sand.

[0017] Therefore, providing a sea sand desalination device that reduces the chlorine and mud content in the desalinated sea sand, and that is more environmentally friendly, energy-efficient, and saves more freshwater has become an urgent technical problem to be solved. Summary of the Invention

[0018] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a sea sand desalination device that reduces the chlorine and mud content in sea sand, and is more environmentally friendly, energy-saving, and freshwater-efficient.

[0019] The objective of this invention can be achieved through the following technical solutions:

[0020] A sea sand desalination device, characterized in that: it includes a desalination tank, the desalination tank is provided with a sand inlet and a water inlet, the lower part of the desalination tank is provided with a sand outlet, the sand outlet is connected to a switch device for controlling sand discharge, the desalination tank is provided with a stirring paddle, the stirring paddle is connected to a stirring drive component, and the lower part of the desalination tank is provided with multiple air blowing holes, the air blowing holes are connected to an air supply device.

[0021] This sea sand desalination equipment actively stirs the sand through a rotating agitator inside the desalination tank, allowing the sand to disperse in the water and avoid clumping. This also provides ample opportunity for the sand to come into full contact with and mix with the fresh water. This process helps dilute the chlorine film adhering to the surface of the sand and facilitates the precipitation of fine sediment. The precipitated chloride ions and fine sediment can then dissolve in the fresh water and separate from the sand. The stirring action of the agitator also creates horizontal water flow, which helps slow down the settling of the sand and ensures more thorough mixing between the sand and the fresh water.

[0022] The air inlet design allows compressed air to be injected into the desalination tank from the bottom. This compressed air causes the sand-water mixture inside the tank to tumble upwards, helping to slow down the sedimentation of the sea sand and preventing rapid deposition. This results in a more thorough mixing of the sea sand and fresh water, facilitating the further precipitation of chloride ions and mud. Furthermore, due to the higher pressure at the bottom of the desalination tank, the air entering the tank forms small bubbles. As these bubbles rise, they expand and grow larger as the pressure gradually decreases, forming larger bubbles. These larger bubbles burst under the impact of the sea sand or the cutting action of the agitator, creating a degree of cavitation. This further helps to remove the sand adhering to the sea sand. The removal of chloride ions and micro-mud from the sand surface allows chloride ions adhering to the surface and deep crevices of the sea sand to be released, improving the dechlorination effect and reducing the mud content in the sea sand. Furthermore, the bubbles formed after blowing adsorb chloride-rich film components and micro-mud, forming chloride foam. As the chloride foam rises and is discharged from the top of the desalination tank, a considerable portion of chloride ions and micro-mud are separated from the sea sand and fresh water. This reduces the absorption of chloride ions and micro-mud by the fresh water during the desalination process, thereby reducing the concentration of chloride ions and micro-mud in the fresh water in the desalination tank. This further improves the desalination effect of this sea sand desalination equipment and allows for more repeated recycling of fresh water, saving water.

[0023] In the desalination process of this sea sand desalination equipment, if only the agitator is used, the sea sand tends to settle to the bottom of the tank, resulting in poor sand-water mixing. Simply using the air vents is also ineffective, as it's difficult to lift and disperse the sea sand in the water. This invention combines agitation with air venting; the two work together to effectively disperse the sea sand in the fresh water and ensure thorough sand-water mixing. With a certain degree of cavitation effect, chloride ions can be released more quickly and efficiently, and fine mud particles can be separated. The combined action of air venting and agitation creates chloride foam within the desalination tank, causing chloride ions and fine mud particles to rise and be carried away by the foam, thus more effectively reducing the chloride and mud content of the sea sand and the absorption of chloride ions by the fresh water.

[0024] The desalination equipment in this sea requires no chemical additives during the entire desalination process, making it more environmentally friendly and consuming less energy and fresh water.

[0025] In the aforementioned sea sand desalination equipment, a lower ultrasonic device is provided at the bottom of the desalination tank.

[0026] When the aforementioned ultrasonic device emits ultrasonic waves into a sand-water mixture, the ultrasonic waves propagating in the liquid can, under the action of cavitation, precipitate chloride ions and tiny mud particles from the surface and deep crevices of the sea sand. The specific principle is as follows: When the mechanical wave of the ultrasonic wave in the liquid reaches one atmosphere, its power density is 0.35 W / cm³.2 At this point, the peak value of the ultrasound can reach a vacuum or negative pressure, but in reality, no negative pressure exists. Therefore, a large pressure is generated in the liquid, which tears the liquid molecules into cavitation nuclei. These cavitation nuclei are very close to a vacuum. They break when the ultrasound reaches its maximum in the reverse direction. The strong impact generated by the breakage knocks off dirt (chloride ions and tiny mud particles) from the surface and deep crevices of the sea sand. At the same time, the strong impact generated by the breakage also causes the relatively loose sand grains to break into tiny mud particles. These chloride ions and tiny mud particles separate from the larger sand grains and mix with the water, thus making the sea sand have a lower chloride content, less mud content, larger sand grains, and higher structural strength.

[0027] In the aforementioned sea sand desalination equipment, an upper ultrasonic device is provided on the upper part of the desalination tank.

[0028] When the aforementioned ultrasonic device emits ultrasonic waves into the sand-water mixture, the ultrasonic waves propagating in the liquid can precipitate chloride ions and tiny mud particles from the surface and deep crevices of the sea sand under the action of cavitation. The specific principle is the same as that of the ultrasonic device below.

[0029] Simultaneously, by pre-treating the sea sand with ultrasound before mixing it in the mixing tank, it can work synergistically with the mixing in the subsequent process. This allows the chloride ions and tiny mud particles precipitated during the ultrasonic treatment to be promptly released and carried away in the fresh water through mixing, thereby improving the desalination effect of the sea sand and further reducing the mud content of the sea sand.

[0030] In the aforementioned sea sand desalination equipment, a vibrating screen is provided at the bottom of the desalination tank.

[0031] After being mixed in the mixing tank, the sea sand has a high moisture content and needs to be separated from the sand by a vibrating screen to reduce the moisture content and meet the requirements for sea sand leaving the factory.

[0032] In the aforementioned sea sand desalination equipment, a spraying device is provided above the front end of the vibrating screen, which can spray fresh water onto the sand particles on the vibrating screen.

[0033] After being processed by the ultrasonic device, the sea sand is initially separated from the chlorine film and fine mud particles. By spraying fresh water in time at the front end of the sand-water separation process using a vibrating screen, the initially separated chlorine-containing components and fine mud particles can be mixed and diluted with fresh water. The vibration of the screen then removes them from the sea sand, further reducing the chlorine and mud content. This process works synergistically with the ultrasonic device to enhance its processing effect, thereby improving the desalination efficiency of the desalination equipment.

[0034] In the aforementioned sea sand desalination equipment, the desalination tank includes a cylindrical washing section and an inverted frustum-shaped funnel-shaped accumulation section. The accumulation section is located below the washing section. The lower ultrasonic device has a material passage that runs vertically through the tank. The upper end of the material passage of the lower ultrasonic device is fixedly connected to the lower end of the accumulation section, and the lower end of the material passage of the lower ultrasonic device is connected to a switch device for controlling sand discharge.

[0035] The effective range of ultrasonic devices on sea sand is limited, generally between 10-40 cm. The best treatment effect is achieved when the sea sand is in a water-rich, sedimented state. A funnel-shaped structure reduces the size of the lower part of the desalination tank, making it suitable for installation and connection to the lower ultrasonic device. It also guides the sea sand to accumulate and settle at the funnel and the lower ultrasonic device for further processing. The processing principle and function of the lower ultrasonic device are the same as the upper ultrasonic device. After the sea sand has been stirred and aerated in the desalination tank, further ultrasonic treatment can further separate chloride ions and fine mud particles, further reducing the desalination effect.

[0036] In the aforementioned sea sand desalination equipment, the lower ultrasonic device includes an inner shell, an outer shell, and multiple lower ultrasonic transducers. The inner shell contains a material passage that runs vertically through it. The lower ultrasonic transducers are fixed to the outer wall of the inner shell and can emit ultrasonic waves into the inner shell. The outer shell is fitted over the outer side of the inner shell and encloses the lower ultrasonic transducers.

[0037] The design of the inner and outer shells of this ultrasonic device provides a sealed space for the lower ultrasonic transducer. The lower ultrasonic transducer, installed on the inner shell, is closer to the sea sand that needs to be cleaned and desalinated, which allows the high-frequency mechanical oscillations generated by the lower ultrasonic transducer to act more effectively and quickly on the sand-water mixture, producing cavitation and thus improving the desalination effect. The outer shell design protects the lower ultrasonic transducer from sand, water, or other foreign objects in the external environment, preventing them from affecting its normal operation and improving the stability of the lower ultrasonic transducer during operation.

[0038] In the aforementioned sea sand desalination equipment, the lower ultrasonic device has two or more sets of lower ultrasonic transducers, which are spaced apart and activated at staggered intervals.

[0039] The two sets of staggered lower ultrasonic transducers ensure that ultrasonic waves continuously act on the sand-water mixture in the material passage, while each set of lower ultrasonic transducers has sufficient time to rest, which helps extend the service life of the lower ultrasonic transducers. At the same time, when a set of lower ultrasonic transducers is not working, it can be inspected or replaced, making maintenance more convenient and not affecting the normal operation of the ultrasonic device.

[0040] In the aforementioned sea sand desalination equipment, a sensor for detecting whether sea sand has accumulated is provided at the lower end of the washing section or the upper end of the accumulation section.

[0041] The sensor is designed to display the height of sea sand deposition in the accumulation section. When the sensor detects sea sand, the switching device starts working, sending the sea sand out from the lower end of the accumulation section, thereby reducing the height of sea sand deposition in the accumulation section. This provides space for sea sand deposition in the cleaning section, preventing the sea sand in the accumulation section from piling up too high and affecting the normal cleaning work in the cleaning section. It also prevents the already deposited sea sand from re-entering the cleaning section for repeated cleaning cycles, which helps to improve the desalination efficiency of sea sand and increase the degree of automation of sea sand desalination.

[0042] In the aforementioned sea sand desalination equipment, the switching device is a gate valve and / or a screw conveyor. The gate valve is installed at the lower end of the material passage of the lower ultrasonic device, or the feed inlet of the screw conveyor is connected to the lower end of the material passage of the lower ultrasonic device. Alternatively, based on the gate valve being installed at the lower end of the material passage of the lower ultrasonic device, a screw conveyor is further installed, with the feed inlet of the screw conveyor connected to the gate valve.

[0043] The screw conveyor includes a conveying pipe, screw blades, a conveying shaft, and a conveying drive motor. The left end of the conveying pipe is provided with a pipe outlet, the right end is equipped with a conveying drive motor, and the upper right end is fixed with a pipe inlet. The pipe inlet is connected to the conveying pipe. The screw blades and the conveying shaft are both located inside the conveying pipe. The screw blades are wound and fixed on the conveying shaft. The conveying drive motor is connected to the conveying shaft.

[0044] This switching device uses spiral blades to transport sea sand from the inlet to the outlet of the pipeline. The spiral blades, working in conjunction with the conveying pipeline, not only transport the sea sand but also obstruct it. When the spiral blades are not rotating, the sea sand is not transported; only when the spiral blades rotate can the sea sand be transported from the inlet to the outlet. The speed of sand discharge and whether it is discharged can be controlled by adjusting the rotation speed of the spiral blades, ensuring that the sea sand passes slowly and smoothly through the ultrasonic device. This ensures that all discharged sea sand undergoes ultrasonic cleaning for a certain period during the discharge process, thereby improving the desalination effect. Furthermore, this switching device can also adjust the sea sand discharge speed according to production needs, making the production process controllable and flexible.

[0045] In the aforementioned sea sand desalination equipment, the blades of the stirring paddle are inclined, with the leading edge of the blades being lower and the trailing edge higher in the direction of rotation.

[0046] The inclined agitator blades cut and guide the sand and water in the desalination tank during rotation, causing the sand and water to rise along the upper side of the blades. This upward lift prevents the sand from settling rapidly under gravity or the agitator's action, allowing sufficient contact time and opportunity between the sand and fresh water. This improves the desalination effect of the sand desalination equipment and lowers the chlorine content in the sand. At the same time, the agitator design accelerates the bursting of bubbles, and the multi-layered blades cut the bubbles multiple times, enhancing cavitation and thus improving the desalination effect.

[0047] The stirring paddle includes blades and a rotating shaft, wherein the blades have at least two layers, or the blades are continuously connected in a spiral shape.

[0048] Because the desalination tank is relatively long vertically, a single-layer impeller can only agitate the sand and water located on the upper and lower sides of the impeller. The sand and water further away from the impeller moves with less amplitude and speed under the impeller's influence, easily leading to stratification of the sea sand and fresh water, resulting in poor desalination. The multi-layer impeller design allows the impeller to simultaneously agitate the sand and water at different depths within the desalination tank, ensuring more thorough and uniform mixing, preventing stratification of the sea sand and fresh water near the impeller, and improving the desalination effect. Furthermore, the multi-layered or spiral-shaped impeller allows for better selection of the lift generated by the agitator.

[0049] In the aforementioned sea sand desalination equipment, the paddle is located in the lower and / or middle part of the desalination tank.

[0050] The more sea sand you sink into the desalination tank, the higher the sand content. Placing the agitator blades in the lower middle part of the tank allows for better mixing and lifting, saving energy and avoiding wasted effort.

[0051] In the aforementioned sea sand desalination equipment, an aeration pipe is provided at the bottom of the desalination tank. The aeration pipe is fixedly connected to the bottom of the desalination tank and is connected to an air supply device. An air blowing hole is provided on the aeration pipe, or multiple aeration discs are connected to the aeration pipe, and the air blowing hole is provided on the aeration discs.

[0052] When this sea sand desalination equipment is working, the air supply device delivers high-pressure air into the aeration pipe through the air inlet. Then, the high-pressure air is sent into the desalination tank through the air blowing holes via the aeration pipe. Multiple air blowing holes ensure more uniform air intake, better generating cavitation and achieving the purpose of cavitation erosion. The use of an aeration disc with air outlets located within it generates more and finer bubbles, resulting in better removal and carry-off of chloride ions during the sea sand desalination process. It also makes the lift generated by the blowing more uniform, further reducing the settling velocity of the sea sand. The air outlets of the aeration disc are located at the bottom of the disc to prevent the settling sea sand from clogging the outlets.

[0053] In the above-mentioned sea sand desalination equipment, the upper end of the desalination tank is provided with an overflow trough, the inner edge of the overflow trough is lower than the outer edge, and the water in the desalination tank overflows into the overflow trough through the inner edge. The overflow trough is provided with a drain outlet.

[0054] During operation, the desalination tank generates a large amount of chloride foam due to the combined action of gas injected through the air inlet and the stirring paddle. This chloride foam rises to the surface of the sand-water mixture. Chloride ions precipitated from the sea sand and some detached micro-mud adhere to the chloride foam. The overflow trough structure can promptly collect the chloride foam and slurry floating on the top of the desalination tank and discharge them through the drain outlet in the overflow trough. The overflow trough structure can promptly remove the precipitated chloride ions and micro-mud along with the chloride foam from the desalination tank, thereby reducing the overall chloride ion content and mud content in the tank. This prevents chloride ions and micro-mud that have been detached from the sea sand from re-integrating into the freshwater in the tank, reducing the absorption of chloride ions and micro-mud by the freshwater during the desalination process, allowing for more repeated recycling of freshwater and saving water.

[0055] In the aforementioned sea sand desalination equipment, a scraper is provided on the upper part of the desalination tank.

[0056] The aforementioned scraper design can actively, quickly, and promptly scrape the chloride foam floating on the liquid surface into the overflow tank, preventing the chloride foam from floating on the top of the desalination tank for too long. This prevents the chloride ions and tiny mud particles attached to the chloride foam from re-integrating into the water as the chloride foam breaks up. This helps to further improve the desalination effect of this sea sand desalination equipment, making the chloride and mud content in the sea sand lower. It can also effectively reduce the absorption of chloride ions by fresh water during the desalination process, allowing for more repeated recycling of fresh water and saving water.

[0057] In the aforementioned sea sand desalination equipment, a number of elongated baffles are installed on the inner wall of the desalination tank, and the baffles are spaced apart along the circumference of the desalination tank.

[0058] The baffle is installed vertically on the inner wall of the desalination tank, or inclined on the inner wall of the desalination tank, or in an "S" shape on the inner wall of the desalination tank.

[0059] The presence of baffles can create a more turbulent flow within the mixing tank, increasing the mixing and contact opportunities between sea sand and fresh water, resulting in more thorough mixing and improved desalination efficiency. The various shapes of baffles described above can further enhance this turbulence effect.

[0060] In the aforementioned sea sand desalination equipment, the upper ultrasonic device includes a cleaning shell and an upper ultrasonic transducer. The cleaning shell is trough-shaped and inclined. Sea sand enters from the higher inclined part and flows out from the lower inclined part and falls into the desalination tank. The upper ultrasonic transducer is installed on the bottom outer wall and / or side outer wall of the cleaning shell. The cleaning shell is also equipped with a water injection pipe to wet the sea sand entering the shell.

[0061] In the aforementioned sea sand desalination equipment, the upper ultrasonic device has two or more sets of upper ultrasonic transducers, which are spaced apart and activated at staggered intervals.

[0062] The two sets of staggered upper ultrasonic transducers ensure that ultrasonic waves continuously act on the sand-water mixture in the material passage, while each set of upper ultrasonic transducers has sufficient time to rest, which helps extend the service life of the upper ultrasonic transducers. At the same time, when the set of upper ultrasonic transducers is not working, it can be inspected or replaced, making maintenance more convenient and not affecting the normal operation of the ultrasonic device.

[0063] The inclined design of the cleaning shell helps the sea sand entering from the feed conveyor to flow in the shell trough. By injecting fresh water into the sea sand entering the cleaning shell, the sea sand can be moistened, providing the necessary working conditions for ultrasonic treatment of desalinated sea sand. This also increases the fluidity of the sea sand and allows for initial mixing of the sea sand with fresh water, facilitating the precipitation and separation of chloride ions and fine mud particles.

[0064] The aforementioned sea sand desalination equipment also includes a rotary screen and a feed conveyor belt. The feed conveyor belt is used to transport the sea sand screened by the rotary screen to the desalination tank. The rotary screen includes a cylindrical screen, a screening support, a screening drive component, and a feed hopper. The cylindrical screen is inclined and rotatably mounted on the screening support. The cylindrical screen has multiple screening holes evenly distributed on it. The screening drive component is fixed to the screening support and can drive the cylindrical screen to rotate relative to the screening support. The discharge section of the feed hopper is connected to the upper end of the cylindrical screen. The rear end of the cylindrical screen is an impurity discharge port. The left, right, and lower sides of the cylindrical screen are surrounded by collection hoppers. The lower end of the collection hopper has a sand discharge port that cooperates with the feed conveyor belt.

[0065] The rotary screen can remove large stones, shells and other impurities from the sea sand, preventing them from affecting the desalination equipment. The screened sea sand is then transported to the cleaning shell or desalination tank via a feed conveyor belt.

[0066] In the aforementioned sea sand desalination equipment, a vibrator is installed on the outer wall of the feed hopper.

[0067] Since sea sand generally contains moisture and has high viscosity, it easily sticks to the inner wall of the collection hopper, causing blockage. The design of the vibrator mentioned above allows the sea sand to pass through the collection hopper more smoothly and fall into the rotary screen, making the feeding more stable and smooth.

[0068] In the aforementioned sea sand desalination equipment, a striking device is provided on the upper side of the cylindrical screen, which can continuously strike the outer wall of the cylindrical screen.

[0069] The striking device includes a striking shaft and multiple flexible striking bars. The striking shaft is coaxially arranged with the cylindrical screen, and the flexible striking bars are spaced apart along the axial direction of the striking shaft. The inner ends of the flexible striking bars are fixedly connected to the striking shaft, and the outer ends can strike the outer wall of the cylindrical screen as the striking shaft rotates. The screening drive simultaneously drives the cylindrical screen and the striking shaft to rotate, and the cylindrical screen and the striking shaft rotate in the same direction. One end of the striking shaft is rotatably connected to the screening support, and the other end is rotatably connected to the feed hopper through a connector.

[0070] This rotary screen is equipped with a tapping device that continuously taps the outer wall of the cylindrical screen during operation, thereby preventing wet sea sand from sticking to the inner wall and screening holes of the cylindrical screen. This effectively prevents sea sand from clogging the screening holes of the cylindrical screen, which is beneficial for the rotary screen to successfully screen sea sand.

[0071] Multiple flexible striking bars are fixed to the striking shaft, ensuring good synchronization during the striking process. The simultaneous striking of multiple bars against the outer wall of the cylindrical screen generates significant impact force and more pronounced vibrations, effectively separating sea sand from the screen. The design of multiple flexible striking bars ensures that all positions along the axial direction of the cylindrical screen are affected by the striking, ensuring that sea sand adhering to the inner wall of the screen is detached under the impact of the flexible bars. The cylindrical screen and the striking shaft rotate in the same direction, maximizing the relative speed between the flexible striking bars and the screen, resulting in a greater striking force and improved striking effect, making it easier for the sea sand to separate from the screen and ensuring good screening performance. The screening drive unit simultaneously drives both the cylindrical screen and the striking shaft, ensuring better synchronization between them. The screening drive unit is either a drive motor or a fuel-powered engine.

[0072] When the flexible striking bar of the aforementioned striking shaft strikes the cylindrical screen, the striking shaft will generate a certain vibration. The other end of the striking shaft is connected to the feed hopper through a connector, so the vibration of the striking shaft will be transmitted to the feed hopper, thereby causing the feed hopper to vibrate together. The vibration of the feed hopper is conducive to the wet sea sand entering the cylindrical screen from the feed hopper, preventing the sea sand from adhering to the inner wall of the feed hopper.

[0073] In the aforementioned sea sand desalination equipment, the water inlet is located in the middle and / or lower part of the desalination tank.

[0074] The water inlet is located in the lower middle part of the desalination tank, which allows the newly introduced fresh water to mix with the relatively high content of sea sand in the tank, resulting in a better mixing effect. At the same time, the water inlet in the lower middle part can have an upward jet effect, which can lift the sea sand to a certain extent, reduce the sinking speed of the sea sand, and improve the mixing effect of sea sand and fresh water.

[0075] Compared with the prior art, the technical effects of the present invention are as follows:

[0076] This sea sand desalination equipment utilizes the combined effects of a stirring paddle to agitate the fresh water and an air vent to create bubbles. This allows the sea sand to be effectively mixed and desalinated within the desalination tank, while also promptly separating and removing chlorine-containing components and mud. Simultaneously, the equipment employs ultrasonic treatment technology to detach and precipitate chloride salts and fine mud particles from the surface and deep pores of the sea sand. Subsequent timely mixing and dilution with fresh water further enhances the desalination and mud removal efficiency. In short, the combined effect of the rotating stirring paddle within the desalination tank, the cavitation phenomenon caused by the bursting of air bubbles, and the cavitation effects of the upper and lower ultrasonic devices continuously and intensely impacts the surface and deep crevices of the sea sand, resulting in excellent desalination and mud removal performance.

[0077] This sea sand desalination equipment uses environmentally friendly, purely physical technology to reduce the chlorine content of desalinated sea sand with lower electricity and water consumption, and also significantly reduces the mud content. It solves the current global technical challenges in sea sand desalination and represents a significant technological contribution. Attached Figure Description

[0078] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0079] Figure 2 This is a schematic diagram of the structure of the ultrasonic device of the present invention.

[0080] Figure 3 This is a cross-sectional view of the ultrasonic device of the present invention.

[0081] Figure 4 This is a schematic diagram of the desalination tank of the present invention.

[0082] Figure 5 This is a cross-sectional view of the desalination tank of the present invention.

[0083] Figure 6 This is a partially enlarged view of the lower end of the desalination tank of the present invention.

[0084] Figure 7 These are a bottom view and a partial enlarged view of the aeration pipe in the desalination tank of the present invention.

[0085] Figure 8 This is a schematic diagram of the structure of the stirring paddle and stirring drive in the desalination tank of the present invention.

[0086] Figure 9 This is a schematic diagram of the connection structure of the stacking section, the lower ultrasonic device, and the discharge mechanism of the present invention.

[0087] Figure 10 This is a schematic diagram of the conveying pipe in the discharge mechanism of the present invention.

[0088] Figure 11 This is a schematic diagram of the structure of the ultrasonic device of the present invention.

[0089] Figure 12 This is a schematic diagram of the installation structure of the inner shell and the lower ultrasonic transducer of the lower ultrasonic device of the present invention.

[0090] Figure 13 This is a partial cross-sectional view of the connection between the ultrasonic device and the switching device of the present invention.

[0091] Figure 14 This is a schematic diagram of the connection structure between the rotary screen and the feed conveyor belt of the present invention.

[0092] Figure 15 This is a schematic diagram of the structure of the rotary screen of the present invention.

[0093] Figure 16 This is a schematic diagram of the striking device in the rotary screen of the present invention.

[0094] In the diagram, 1. Desalination tank; 11. Cleaning section; 111. Overflow trough; 1111. Drain outlet; 112. Baffle plate; 113. Water inlet; 114. Sensor; 12. Accumulation section; 121. Sand outlet; 13. Agitator; 131. Blade; 132. Rotating shaft; 133. Scraper; 14. Aeration pipe; 141. Aeration disc; 142. Air blowing hole; 15. Mounting bracket; 16. Agitator drive component; 2. Upper ultrasonic device; 21. Cleaning housing; 22. Upper ultrasonic transducer; 23. Water injection pipe; 3. Switching device; 31. Conveying pipeline; 311. Pipe outlet; 312. Feed inlet; 32. 33. Spiral blades; 34. Conveying shaft; 4. Lower ultrasonic device; 41. Inner shell; 411. Material passage; 42. Outer shell; 43. Lower ultrasonic transducer; 5. Rotary screen; 51. Cylindrical screen; 511. Impurity outlet; 512. Screening hole; 52. Screening support; 53. Screening drive; 54. Feed hopper; 541. Vibrator; 55. Collection hopper; 551. Sea sand outlet; 56. Impact device; 561. Impact shaft; 562. Flexible impact bar; 563. Connector; 6. Vibrating screen; 61. Spraying device; 81. Feed conveyor belt; 82. Discharge conveyor belt. Detailed Implementation

[0095] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings to further illustrate the technical solutions of the present invention. However, the present invention is not limited to these embodiments.

[0096] The working principle of this sea sand desalination equipment is as follows:

[0097] The sea sand is first screened by a rotary screen 5 to remove impurities such as stones, shells, and plastics. After screening, the sea sand is then conveyed to the upper ultrasonic device 2 by a feed conveyor belt 81.

[0098] The water injection pipe 23 inside the upper ultrasonic device 2 moistens the sea sand, and the upper ultrasonic transducer 22 emits ultrasonic waves into the sea sand to achieve the first desalination.

[0099] Sea sand desalinated by the ultrasonic device 2 enters the desalination tank 1, while fresh water is continuously injected into the desalination tank 1. The stirring paddle 13 installed inside the desalination tank 1 rotates to form a vortex, causing the sea sand and fresh water to rotate, thereby thoroughly mixing the sea sand and fresh water. At the same time, air is injected into the desalination tank 1 through the air blowing hole 142 at the bottom of the desalination tank 1. The air forms bubbles in the desalination tank 1 and bursts during its ascent, producing cavitation. The rotating stirring paddle 13 can generate negative pressure and guide the sea sand, reducing the sea sand deposition rate. The bubbles burst under the cutting action of the stirring paddle 13 and the rotating sea sand, producing cavitation. As time goes by, some sea sand gradually deposits at the bottom of the desalination tank 1 and is discharged from the desalination tank 1 through the sand outlet 121 at the bottom of the desalination tank 1, achieving a second desalination.

[0100] The sea sand and fresh water discharged from the bottom of the desalination tank 1 enter the lower ultrasonic device 4. The lower ultrasonic transducer 43 emits ultrasonic waves into the mixture of sea sand and fresh water to achieve the third desalination.

[0101] After being subjected to ultrasonic waves, the sea sand enters the vibrating screen 6. Fresh water is sprayed onto the front end of the vibrating screen 6, and the sea sand is separated from the sand-water mixture by vibration. The sea sand is then transported to the designated storage location by the discharge conveyor belt 82 to complete the desalination process.

[0102] This sea sand desalination equipment includes a desalination tank 1, which is provided with a sand inlet and a water inlet 113. The lower part of the desalination tank 1 is provided with a sand outlet 121, which is connected to a switch device 3 for controlling sand discharge. The desalination tank 1 is provided with a stirring paddle 13, which is connected to a stirring drive component 16. The upper end of the desalination tank 1 is fixedly connected to a mounting frame 15, and the stirring drive component 16 is fixed on the mounting frame 15. The lower part of the desalination tank 1 is provided with multiple air blowing holes 142, which are connected to an air supply device. This sea sand desalination equipment utilizes a combination of rotating agitator 13 within the desalination tank 1 and cavitation generated by the bursting of air bubbles. This combined action continuously and intensely impacts the surface and deep crevices of the sea sand, resulting in superior desalination performance. Simultaneously, the combined rotation of the agitator 13 and air blowing generates a large amount of chloride foam within the desalination tank 1. This foam carries dissolved chloride ions and fine sediment particles out of the tank, significantly reducing the chloride and sediment content and improving the desalination effect. The entire desalination process requires no chemical additives, consumes less energy and fresh water, and is more environmentally friendly.

[0103] Furthermore, the lower part of the desalination tank 1 is equipped with a lower ultrasonic device 4. The cavitation phenomenon generated by this lower ultrasonic device 4 will create a strong impact that knocks down dirt (chloride ions and tiny mud particles) from the surface and deep crevices of the sea sand; this strong impact will also cause the relatively loose sand grains to break into tiny mud particles. These chloride ions and tiny mud particles will separate from the larger sand grains and mix in the water, thereby reducing the chloride content in the sea sand, reducing the mud content in the sea sand, increasing the size of the sand grains, and increasing the structural strength of the sand grains.

[0104] After stirring and blowing air in the desalination tank 1, most of the chloride ions and tiny mud particles attached to the surface of the sea sand can be precipitated. Then, the sea sand is further desalinated by the ultrasonic device 4, which makes it easier for the ultrasonic waves to act on the chloride ions and tiny mud particles deep in the sea sand, allowing these chloride ions and tiny mud particles located deep in the crevices to be precipitated. At the same time, it can also precipitate the chloride ions and tiny mud particles that are still stubbornly attached to the surface of the sea sand after desalination in the desalination tank 1. The stirring, blowing air and the ultrasonic device 4 work together to make the entire desalination process easier and more thorough, resulting in lower chloride and mud content in the desalinated sea sand.

[0105] Furthermore, an upper ultrasonic device 2 is installed at the top of the desalination tank 1. The cavitation phenomenon generated by this upper ultrasonic device 2 creates a strong impact that knocks off dirt (chloride ions and fine mud particles) from the surface and deep crevices of the sea sand. This strong impact also causes relatively loose sand particles to break into fine mud particles. These chloride ions and fine mud particles separate from the larger sand particles and mix with the water, thus lowering the chloride content and mud content in the sea sand, making the sand particles larger and stronger. After desalination by the upper ultrasonic device 2, the adhesion of chloride ions and fine mud particles on the surface of the sea sand is lower, making it easier for them to precipitate and dissolve in the fresh water under the subsequent stirring and blowing action of the desalination tank 1, increasing the desalination speed. Under the same desalination effect, the overall desalination speed can be faster, which is beneficial to increasing production. Combined with the final lower ultrasonic device 4 for further desalination, the desalination can be more thorough, resulting in lower chloride and mud content in the desalinated sea sand.

[0106] Furthermore, a vibrating screen 6 is connected to the lower part of the desalination tank 1; a spraying device 61 is installed above the front end of the vibrating screen 6, which can spray fresh water onto the sand particles of the vibrating screen 6. After the sea sand is treated by the ultrasonic device 4, the sea sand is in a preliminary separation state with the chlorine film and the fine mud. By spraying fresh water in time at the front end of the vibrating screen 6 to separate the sand and water, the initially separated chlorine-containing components and fine mud can be mixed and diluted with fresh water in time. The vibration of the vibrating screen 6 separates the sea sand. The design of the vibrating screen 6 can dehydrate the desalinated sea sand and remove the chloride ions and fine mud attached to the water from the desalinated sea sand, avoiding the adhesion of chlorine and mud-containing water stains on the surface of the desalinated sea sand, making the chlorine and mud content in the sea sand lower, thereby improving the desalination effect of this sea sand desalination equipment.

[0107] In this sea sand desalination equipment, the desalination tank 1 includes a cylindrical cleaning section 11 and an inverted frustum-shaped funnel-shaped accumulation section 12. The accumulation section 12 is located below the cleaning section 11. The lower ultrasonic device 4 has a vertically penetrating material passage 411. The upper end of the material passage 411 of the lower ultrasonic device 4 is fixedly connected to the lower end of the accumulation section 12, and the lower end of the material passage 411 of the lower ultrasonic device 4 is connected to the switch device 3 that controls the sand discharge. The lower part of the desalination tank 1 is provided with a water inlet 113, which is close to or coincides with the aeration disc 141 in the vertical direction. The lower end of the cleaning section 11 or the upper end of the accumulation section 12 is provided with a sensor 114 for detecting whether sea sand is accumulated. The water inlet 113 is located in the middle and / or lower part of the desalination tank 1.

[0108] In this sea sand desalination equipment, the inverted frustum-shaped funnel-shaped accumulation section 12 serves a dehydration function. The placement of the accumulation section 12, in conjunction with the inlet 113, ensures lower chlorine and sediment content in the freshwater within it. By designing the angle and height of the accumulation section 12, sufficient water content is ensured in the sea sand entering the lower ultrasonic device 4, guaranteeing its proper desalination effect. The structure of the accumulation section 12, combined with the lower ultrasonic device 4, further reduces chlorine and sediment content in the water entering the device, facilitating the precipitation of chloride ions and fine sediment adhering to the sea sand surface, thus improving the desalination effect. Functionally, the two components support each other and work together.

[0109] In this sea sand desalination equipment, the blades 131 of the agitator 13 are inclined, with the leading edge of the blades 131 being lower and the trailing edge higher in the direction of rotation. The agitator 13 includes blades 131 and a rotating shaft 132. The blades 131 have at least two layers, or the blades are continuously connected in a spiral shape. The blades 131 are located in the lower and / or middle part of the desalination tank 1. The structure of the blades 131 can cut and guide the sand and water in the desalination tank 1 during rotation, allowing the sand and water to rise along the upper side of the blades 131 of the agitator 13. This prevents the sea sand from rapidly settling under gravity or the stirring action of the agitator 13, allowing the sea sand and fresh water to fully contact each other, improving the desalination effect of the sea sand desalination equipment, and reducing the chlorine content in the sea sand. At the same time, the design of the agitator 13 can also accelerate the cavitation of bubbles. The multi-layered blades 131 can also cut the bubbles multiple times, which is beneficial to enhancing the cavitation phenomenon and thus improving the sea sand desalination effect. Setting the blade 131 at the lower and / or middle part of the rotating shaft 132 can stir the area with a high content of sea sand, making the sand and water more fully and evenly mixed, reducing the sedimentation rate of sea sand, and also preventing the sea sand from being thrown too high under the action of the stirring blade 13 and overflowing from the upper edge of the desalination tank 1.

[0110] like Figure 11-13As shown, the lower ultrasonic device 4 includes an inner shell 41, an outer shell 42, and multiple lower ultrasonic transducers 43. The inner shell 41 has a material passage 411 that runs vertically through it. The lower ultrasonic transducers 43 are fixed to the outer wall of the inner shell 41 and can emit ultrasonic waves into the inner shell 41. The outer shell 42 is fitted onto the outer side of the inner shell 41 and covers the lower ultrasonic transducers 43. There are two or more sets of lower ultrasonic transducers 43 in the lower ultrasonic device 4. The two or more sets of lower ultrasonic transducers 43 are arranged at intervals and are staggered when they are turned on.

[0111] like Figure 9 and Figure 10 As shown, the switching device 3 is a gate valve and / or a screw conveyor. The gate valve is installed at the lower end of the material passage 411 of the lower ultrasonic device 4, or the feed inlet 312 of the screw conveyor is connected to the lower end of the material passage 411 of the lower ultrasonic device 4. Alternatively, on the basis of installing the gate valve at the lower end of the material passage 411 of the lower ultrasonic device 4, a screw conveyor is further installed, and the feed inlet 312 of the screw conveyor is connected to the gate valve. The screw conveyor includes a conveying pipe 31, a screw blade 32, a conveying shaft 33, and a conveying drive motor. The left end of the conveying pipe 31 is provided with a pipe outlet 311, the right end is equipped with a conveying drive motor, and the upper end of the right side is fixed with a feed inlet 312. The feed inlet 312 is connected to the conveying pipe 31. The screw blade 32 and the conveying shaft 33 are both located inside the conveying pipe 31. The screw blade 32 is wound and fixed on the conveying shaft 33, and the conveying drive motor is connected to the conveying shaft 33.

[0112] like Figure 7 As shown, the lower part of the desalination tank 1 is provided with an aeration pipe 14, which is fixedly connected to the lower part of the desalination tank 1. The aeration pipe 14 is connected to the air supply device, and the air blowing hole 142 is provided on the aeration pipe 14. Alternatively, multiple aeration discs 141 are connected to the aeration pipe 14, and the air blowing hole 142 is provided on the aeration discs 141.

[0113] like Figure 4 , Figure 5 and Figure 7 As shown, the upper end of the desalination tank 1 is provided with an overflow trough 111. The inner edge of the overflow trough 111 is lower than the outer edge. The water in the desalination tank 1 overflows into the overflow trough 111 through the inner edge. The overflow trough 111 is provided with a drain outlet 1111. A scraper 133 is provided on the upper part of the desalination tank 1. Several long strip-shaped baffles 112 are installed on the inner wall of the desalination tank 1. The baffles 112 are spaced apart along the circumference of the desalination tank 1. The baffles 112 are arranged vertically on the inner wall of the desalination tank 1, or inclined on the inner wall of the desalination tank 1, or arranged in an "S" shape on the inner wall of the desalination tank 1.

[0114] like Figure 2 and Figure 3As shown, the upper ultrasonic device 2 includes a cleaning housing 21 and an upper ultrasonic transducer 22. The cleaning housing 21 is trough-shaped and inclined. Sea sand enters from the higher inclined part and flows out from the lower inclined part and falls into the desalination tank 1. The upper ultrasonic transducer 22 is installed on the bottom outer wall and / or side outer wall of the cleaning housing 21. The cleaning housing 21 is also provided with a water injection pipe 23 for wetting the sea sand entering the housing. There are two or more sets of upper ultrasonic transducers 22 in the upper ultrasonic device 2. The two or more sets of upper ultrasonic transducers 22 are arranged at intervals and are staggered when turned on.

[0115] like Figure 14 and Figure 16 As shown, this sea sand desalination equipment includes a rotary screen 5 and a feed conveyor belt 81. The feed conveyor belt is used to transport the sea sand screened by the rotary screen 5 to the desalination tank 1. The rotary screen 5 includes a cylindrical screen 51, a screening support 52, a screening drive component 53, and a feed hopper 54. The cylindrical screen 51 is inclined and rotatably mounted on the screening support 52. The cylindrical screen 51 has multiple screening holes 512 evenly distributed. The screening drive component 53 is fixed on the screening support 52 and can drive the cylindrical screen 51 to rotate relative to the screening support 52. The discharge part of the feed hopper 54 is connected to the upper end of the cylindrical screen 51. The rear end of the cylindrical screen 51 is an impurity discharge port 511. The left, right, and lower sides of the cylindrical screen 51 are surrounded by collection hoppers 55. The lower end of the collection hopper 55 is provided with a sea sand outlet 55 that cooperates with the feed conveyor belt 81. 1. A vibrator 541 is installed on the feed hopper 54; a striking device 56 is provided on the upper side of the cylindrical screen 51, which can continuously strike the outer wall of the cylindrical screen 51; the striking device 56 includes a striking shaft 561 and a plurality of flexible striking strips 562. The striking shaft 561 is coaxially arranged with the cylindrical screen 51, and the flexible striking strips 562 are spaced apart along the axial direction of the striking shaft 561. The inner end of the flexible striking strip 562 is fixedly connected to the striking shaft 561, and the outer end can strike the outer wall of the cylindrical screen 51 as the striking shaft 561 rotates; the screening drive 53 simultaneously drives the cylindrical screen 51 and the striking shaft 561 to rotate, and the cylindrical screen 51 and the striking shaft 561 rotate in the same direction; one end of the striking shaft 561 is rotatably connected to the screening support 52, and the other end is rotatably connected to the feed hopper 54 through the connector 563.

[0116] Arrow A in the attached figure indicates the direction of rotation of the stirring paddle; the above embodiments are only preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape and principle of the present invention should be covered within the scope of protection defined by the claims of the present invention.

Claims

1. A sea sand desalination device, characterized in that: The desalination tank (1) includes a sand inlet and a water inlet (113). The lower part of the desalination tank (1) is provided with a sand outlet (121), which is connected to a switch device (3) for controlling sand discharge. The desalination tank (1) is provided with a stirring paddle (13), which is connected to a stirring drive (16). The lower part of the desalination tank (1) is provided with multiple air blowing holes (142), which are connected to an air supply device.

2. The sea sand desalination equipment according to claim 1, characterized in that: The lower part of the desalination tank (1) is equipped with a lower ultrasonic device (4).

3. The sea sand desalination equipment according to claim 2, characterized in that: The upper part of the desalination tank (1) is equipped with an upper ultrasonic device (2).

4. The sea sand desalination equipment according to claim 3, characterized in that: A vibrating screen (6) is connected to the lower part of the desalination tank (1).

5. The sea sand desalination equipment according to claim 4, characterized in that: A spraying device (61) is provided above the front end of the vibrating screen (6), and the spraying device (61) can spray fresh water onto the sand particles on the vibrating screen (6).

6. A sea sand desalination device according to any one of claims 1-5, characterized in that: The desalination tank (1) includes a cylindrical cleaning section (11) and an inverted frustum-shaped funnel-shaped accumulation section (12). The accumulation section (12) is located below the cleaning section (11). The lower ultrasonic device (4) has a material passage (411) that runs vertically through the tank. The upper end of the material passage (411) of the lower ultrasonic device (4) is fixedly connected to the lower end of the accumulation section (12). The lower end of the material passage (411) of the lower ultrasonic device (4) is connected to the switch device (3) that controls the sand discharge.

7. The sea sand desalination equipment according to claim 6, characterized in that: The lower ultrasonic device (4) includes an inner shell (41), an outer shell (42), and multiple lower ultrasonic transducers (43). The inner shell (41) has a material passage (411) that runs vertically through it. The lower ultrasonic transducers (43) are fixed to the outer wall of the inner shell (41) and can emit ultrasonic waves into the inner shell (41). The outer shell (42) is fitted onto the outside of the inner shell (41) and covers the lower ultrasonic transducers (43).

8. The sea sand desalination equipment according to claim 7, characterized in that: The lower ultrasonic device (4) has two or more sets of lower ultrasonic transducers (43), which are spaced apart and turned on at staggered intervals.

9. A sea sand desalination device according to claim 6, characterized in that: The lower end of the cleaning section (11) or the upper end of the accumulation section (12) is provided with a sensor (114) for detecting whether sea sand has accumulated.

10. A sea sand desalination device according to any one of claims 1-5, characterized in that: The switching device (3) is a gate valve and / or a screw conveyor. The gate valve is installed at the lower end of the material passage (411) of the lower ultrasonic device (4), or the feed port (312) of the screw conveyor is connected to the lower end of the material passage (411) of the lower ultrasonic device (4), or a screw conveyor is further installed on the basis of the gate valve being installed at the lower end of the material passage (411) of the lower ultrasonic device (4), and the feed port (312) of the screw conveyor is connected to the gate valve.

11. A sea sand desalination device according to claim 10, characterized in that: The screw conveyor includes a conveying pipe (31), a screw blade (32), a conveying shaft (33), and a conveying drive motor. The left end of the conveying pipe (31) is provided with a pipe outlet (311), the right end is equipped with a conveying drive motor, and the upper right end is fixed with a feed inlet (312). The feed inlet (312) is connected to the conveying pipe (31). The screw blade (32) and the conveying shaft (33) are both located inside the conveying pipe (31). The screw blade (32) is wound and fixed on the conveying shaft (33). The conveying drive motor is connected to the conveying shaft (33).

12. A sea sand desalination device according to any one of claims 1-5, characterized in that: The blades (131) of the stirring paddle (13) are inclined, and the leading edge of the blades (131) is low and the trailing edge is high in the direction of rotation.

13. The sea sand desalination equipment according to claim 12, characterized in that: The stirring paddle (13) includes blades (131) and a rotating shaft (132). The blades (131) have at least two layers, or the blades are continuously connected in a spiral shape.

14. The sea sand desalination equipment according to claim 13, characterized in that: The blade (131) is located in the lower and / or middle part of the desalination tank (1).

15. A sea sand desalination device according to any one of claims 1-5, wherein the lower part of the desalination tank (1) is provided with an aeration pipe (14), the aeration pipe (14) is fixedly connected to the lower part of the desalination tank (1), the aeration pipe (14) is connected to an air supply device, the air blowing hole (142) is provided on the aeration pipe (14), or a plurality of aeration discs (141) are connected to the aeration pipe (14), and the air blowing hole (142) is provided on the aeration discs (141).

16. A sea sand desalination device according to any one of claims 1-5, characterized in that: The upper end of the desalination tank (1) is provided with an overflow trough (111). The inner edge of the overflow trough (111) is lower than the outer edge. The water in the desalination tank (1) overflows into the overflow trough (111) through the inner edge. The overflow trough (111) is provided with a drain outlet (1111).

17. A sea sand desalination device according to claim 16, characterized in that: A scraper (133) is provided on the upper part of the desalination tank (1).

18. A sea sand desalination device according to any one of claims 1-5, characterized in that: Several long strip-shaped baffles (112) are installed on the inner wall of the desalination tank (1), and the baffles (112) are arranged at intervals along the circumference of the desalination tank (1).

19. A sea sand desalination device according to claim 18, characterized in that: The baffle plate (112) is vertically arranged on the inner wall of the desalination tank (1), or inclined on the inner wall of the desalination tank (1), or arranged in an "S" shape on the inner wall of the desalination tank (1).

20. A sea sand desalination device according to any one of claims 3-5, characterized in that: The upper ultrasonic device (2) includes a cleaning housing (21) and an upper ultrasonic transducer (22). The cleaning housing (21) is trough-shaped and inclined. Sea sand enters from the higher inclined part and flows out from the lower inclined part and falls into the desalination tank (1). The upper ultrasonic transducer (22) is installed on the bottom outer wall and / or side outer wall of the cleaning housing (21). The cleaning housing (21) is also provided with a water injection pipe (23) to wet the sea sand entering the housing.

21. A sea sand desalination device according to claim 20, characterized in that: The upper ultrasonic device (2) has two or more sets of upper ultrasonic transducers (22), which are arranged at intervals and turned on at staggered intervals.

22. A sea sand desalination device according to any one of claims 1-5, characterized in that: The system includes a rotary screen (5) and a feed conveyor belt (81), the feed conveyor belt being used to transport the sea sand screened by the rotary screen (5) to the desalination tank (1); the rotary screen (5) includes a cylindrical screen (51), a screening support (52), a screening drive (53), and a feed hopper (54), the cylindrical screen (51) being inclined and rotatably mounted on the screening support (52), the cylindrical screen (51) having a plurality of screening holes (512) evenly distributed thereon, the screening drive (53) being... 3) Fixed on the screening support (52), the screening drive (53) can drive the cylindrical screen (51) to rotate relative to the screening support (52). The discharge part of the feed hopper (54) is connected to the upper end of the cylindrical screen (51). The rear end of the cylindrical screen (51) is the impurity discharge port (511). The left and right sides and the lower side of the cylindrical screen (51) are surrounded by a collection hopper (55). The lower end of the collection hopper (55) is provided with a sea sand outlet (551) that cooperates with the feed conveyor belt (81).

23. The sea sand desalination equipment according to claim 22, characterized in that: A vibrator (541) is provided on the feed hopper (54).

24. A sea sand desalination device according to claim 23, wherein a striking device (56) is provided on the upper side of the cylindrical screen (51), and the striking device (56) is capable of continuously striking the outer wall of the cylindrical screen (51).

25. A sea sand desalination device according to claim 24, characterized in that: The striking device (56) includes a striking shaft (561) and a plurality of flexible striking strips (562). The striking shaft (561) is coaxially arranged with the cylindrical screen (51). The flexible striking strips (562) are spaced apart along the axial direction of the striking shaft (561). The inner end of the flexible striking strip (562) is fixedly connected to the striking shaft (561), and the outer end can strike the outer wall of the cylindrical screen (51) as the striking shaft (561) rotates. The screening drive (53) simultaneously drives the cylindrical screen (51) and the striking shaft (561) to rotate. The cylindrical screen (51) and the striking shaft (561) rotate in the same direction. One end of the striking shaft (561) is rotatably connected to the screening bracket (52), and the other end is rotatably connected to the feed hopper (54) through the connector (563).

26. A sea sand desalination device according to any one of claims 1-5, characterized in that: The water inlet (113) is located in the middle and / or lower part of the desalination tank (1).

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