Filtering equipment for extraction of dunaliella salina and preparation process of filtering equipment

Abstract

The filtering equipment comprises a supporting frame, a filtering bin, a disturbance mechanism, a layering part and a discharging mechanism, the disturbance mechanism comprises a motor, a first driving shaft, a turning plate and a corner piece, the layering part is provided with filtering holes and isolation strips, and the corner piece is provided with a rack used for cleaning the filtering holes; the discharging mechanism comprises a second driving shaft, a positioning seat, a discharging plate and a limiting structure, the disturbance mechanism and the discharging mechanism are synchronously linked through a chain, dunaliella salina can be effectively cleaned and filtered in a layered mode, impurities are prevented from blocking filtering holes, efficient and continuous discharging is achieved, and the discharging efficiency is improved. Meanwhile, bottom residues and waste liquid are discharged in time through the residue discharging channel and the liquid discharging pipe, and the device is suitable for the pretreatment process of dunaliella salina.

Description

Technical Field

[0001] The present invention belongs to the technical field of Dunaliella salina processing, and particularly relates to a filtering device for Dunaliella salina extraction and its preparation process. Background Art

[0002] Dunaliella salina is a kind of microalgae resource with important medicinal and health care values, rich in active ingredients such as β-carotene, protein, polysaccharide, etc., and is widely used in the fields of food, medicine, cosmetics, etc. In the deep processing of Dunaliella salina, filtration, as a key step in its extraction pretreatment link, directly affects the subsequent extraction efficiency and product purity. In the prior art, Dunaliella salina is often preliminarily cleaned and separated by means of static sedimentation, single-layer filtration or simple centrifugation. However, since a large amount of sediment, impurities or colloids often adhere to the surface of Dunaliella salina cells, traditional filtration methods are prone to problems such as clogging of filtration holes, difficulty in effectively separating impurities, and incomplete cleaning during the treatment process, seriously affecting the subsequent process effects.

[0003] In addition, although some current filtration devices are equipped with stirring devices to improve the cleaning efficiency, their structures are often relatively independent of the discharging structure, and there are problems of out-of-synchronization during operation, which may cause Dunaliella salina to enter the discharging structure in advance before the cleaning is completed, thus affecting the purity of the final filtrate. On the other hand, during the sedimentation process of bottom impurities, due to water flow disturbance or equipment vibration, the settled impurities are easily resuspended, thus increasing the load of the filtration system and the maintenance frequency.

[0004] Therefore, the existing Dunaliella salina filtration devices still have obvious deficiencies in terms of structural coordination, anti-clogging performance and filtration stability. Summary of the Invention

[0005] Aiming at the problems existing in the prior art, the purpose of the present invention is to provide a filtering device for Dunaliella salina extraction and its preparation process, which can realize an improved device with coordinated linkage of functions such as stirring, layered filtration, anti-clogging self-cleaning, synchronous discharging, etc., so as to improve the processing efficiency and automation level of the Dunaliella salina filtration link.

[0006] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] A filtering device for Dunaliella salina extraction, including a support frame, inside which a filtration chamber is arranged, and inside the filtration chamber, a layering member and a disturbance mechanism are arranged;

[0008] The disturbance mechanism is located above the layering member, and the disturbance mechanism is used for stirring the Dunaliella salina in the filtration chamber;

[0009] Inside the filtration chamber, a discharging mechanism is further arranged, and the discharging mechanism is used for discharging the filtered Dunaliella salina from the filtration chamber;

[0010] A chain is connected between the discharging mechanism and the disturbing mechanism, and the rotations of the discharging mechanism and the disturbing mechanism are synchronized.

[0011] During use, the Dunaliella salina to be filtered is put into the filtration chamber. The Dunaliella salina is stirred by the discharging mechanism, and the filtered Dunaliella salina is discharged from the filtration chamber by the disturbing mechanism, while the residue after filtration is discharged from the bottom of the filtration chamber.

[0012] Further, the disturbing mechanism includes a motor installed on the outer wall of the filtration chamber. The output end of the motor is connected to a first driving shaft located inside the filtration chamber. The outer side of the first driving shaft is connected with a flap, and both ends of the flap are connected with angle members.

[0013] The motor drives the first driving shaft to rotate. The first driving shaft drives the flap and the angle members to rotate in the filtration chamber, and stirs the Dunaliella salina in the filtration chamber, so that the impurities in the Dunaliella salina fall off from the Dunaliella salina.

[0014] Further, the cross-section of the stratifying member is set as a semi-annular shape, and the center of the stratifying member coincides with the axis of the first driving shaft.

[0015] Isolation strips are arranged at equal intervals along the length direction of the upper end surface of the stratifying member.

[0016] Rack teeth are arranged at equal intervals along the length direction of the angle member. When the angle member sweeps across the stratifying member, the rack teeth and the isolation strips are arranged in a staggered manner.

[0017] Filter holes are uniformly formed through the upper end surface of the stratifying member. When filtering the Dunaliella salina, the residue falling off from the Dunaliella salina will enter the bottom of the filtration chamber through the filter holes.

[0018] Further, positioning blocks are arranged at the bottom of the isolation strips. When the isolation strips are connected to the stratifying member, the positioning blocks are inserted into the stratifying member.

[0019] Both sides of the stratifying member are fixedly connected with ear plates. When installing the stratifying member into the filtration chamber, the ear plates are fixed in the filtration chamber by using screws.

[0020] Further, a discharging hopper is arranged outside the filtration chamber. The longitudinal section of the discharging hopper is set as a funnel shape, and a mounting seat is arranged at the inner top of the discharging hopper.

[0021] The discharging mechanism is installed in the mounting seat, and the discharging mechanism includes a second driving shaft. A positioning seat is sleeved on the second driving shaft. Limiting grooves are arranged at equal intervals along the central axis on the outer side of the positioning seat, and a blanking plate is rotatably connected in each limiting groove. Through holes are uniformly formed through the blanking plate, and angle limiting blocks are fixedly connected at the edges of each limiting groove.

[0022] Further, a through hole is formed through one end of the blanking plate.

[0023] Both ends of the positioning seat are provided with baffles, and the blanking plate is rotatably connected between the two baffles through pins.

[0024] Furthermore, dust covers are provided on both outer sides of the support frame, a maintenance door is installed on the dust cover, and a heat dissipation fan is installed on the maintenance door.

[0025] Furthermore, a first diversion plate and a second diversion plate are arranged inside the filter bin. Both the first diversion plate and the second diversion plate are located below the layering member, and the first diversion plate and the second diversion plate are arranged in a staggered manner.

[0026] Furthermore, a slag discharge channel is arranged at the bottom of the filter bin, and a drain pipe is arranged on the outer side below the filter bin.

[0027] A Dunaliella salina extraction process includes the following steps:

[0028] S1. Put the Dunaliella salina to be filtered into the filter bin, and add a cleaning solution to the filter bin;

[0029] S2. Start the perturbation mechanism, drive the first drive shaft, the flap and the angle member to rotate by the motor, stir the Dunaliella salina, and make the impurities attached to its surface fall off;

[0030] S3. The impurities fall onto the layering member, and part of the impurities settle to the bottom of the filter bin through the filter holes on the layering member. Under the diversion action of the first diversion plate and the second diversion plate, the impurities are prevented from suspending;

[0031] S4. During the stirring process, the rack on the angle member sweeps the gap between the isolation bars, and sweeps the impurities accumulated in the gap into the filter holes to avoid clogging of the filter holes;

[0032] S5. The perturbation mechanism and the discharging mechanism are synchronously driven by a chain. After the stirring is completed, the angle member continues to rotate clockwise, transfers the filtered Dunaliella salina to the blanking plate, and under the supporting action of the angle limit block, the blanking plate flips and discharges the Dunaliella salina into the discharging hopper;

[0033] S6. Discharge the filtered Dunaliella salina through the discharge port at the bottom of the discharge hopper, and at the same time discharge the bottom residue through the slag discharge channel and the drain pipe.

[0034] Compared with the prior art, the beneficial effects of the present invention are:

[0035] By arranging a perturbation mechanism in the filtration bin, the present invention realizes the active stirring and perturbation of Dunaliella salina, effectively improving the contact efficiency between Dunaliella salina and the cleaning liquid. The flap driven by the motor and the angle part structure form multi-directional turbulent flows during rotation, making it easier for the sediment and impurities adsorbed on the surface of Dunaliella salina to be peeled off and separated, thus overcoming the problem of incomplete removal of impurities in the traditional static or single-stirring cleaning method, improving the pretreatment effect, and ensuring the purity and efficiency of the subsequent extraction process.

[0036] By arranging a layered part in the filtration bin and uniformly opening filtration holes on the layered part, and at the same time combining the rack structure on the angle part with the isolation strips on the layered part to form an interleaved sweeping structure, during the stirring process of Dunaliella salina, after the impurities fall off, they can not only quickly settle to the layered part, but also be actively pushed into the filtration holes under the sweeping action of the rack, effectively preventing the occurrence of the problem of filtration hole blockage, solving the problem that the existing filtration device often needs frequent maintenance due to residue accumulation blocking the filtration holes after running for a period of time, and improving the continuous operation ability and reliability of the equipment.

[0037] The present invention is provided with a first guide plate and a second guide plate arranged alternately below the layered part. By forming a stable diversion channel, it avoids the problem that the bottom impurities in the traditional equipment are resuspended under the disturbance of the water flow. The alternately arranged structure makes the liquid flow field tend to be stable, effectively guiding the settled impurities to the slag discharge channel area, greatly improving the bottom layer stability and impurity removal efficiency, and reducing the risk of secondary pollution in the recycling of the cleaning liquid.

[0038] By adopting a chain linkage method between the discharging mechanism and the perturbation mechanism, the present invention realizes the synchronous control of the cleaning and stirring and discharging actions of Dunaliella salina. During the rotation of the angle part, it not only completes the stirring function of Dunaliella salina, but also drives Dunaliella salina to the blanking plate area after the cleaning is completed, and realizes precise dumping under the cooperation of the limiting structure, avoiding the problems of separation between the discharging structure and the stirring structure, cumbersome operation and poor synchronism in the traditional equipment, and improving the automation degree and working efficiency of the equipment operation.

[0039] The slag discharge channel and the liquid discharge pipe structure of the present invention realize the automatic discharge of the filtration residue and the liquid. The slag discharge channel is arranged at the bottommost part of the filtration bin, and the impurities are easy to gather and be discharged in time under the action of gravity. Cooperating with the external hose and the valve control system, it effectively solves the problem of difficult cleaning of the bottom residue in the existing equipment and the need for frequent manual intervention, and improves the hygiene and convenience of the overall operation.

[0040] The present invention is provided with a dust cover and a maintenance door outside the support frame. The maintenance door is provided with a cooling fan, which enhances the sealing performance and thermal management ability during the operation of the equipment. The dust-proof structure can prevent external dust from entering the system and protect the operating environment of the equipment. The heat dissipation structure ensures that the operating temperature of the motor and transmission components is controlled within a reasonable range, prolongs the service life of the equipment, and solves the problem that the existing equipment is prone to failure in high-temperature or dusty environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 is a schematic structural diagram of the present invention;

[0042] Figure 2 is a schematic structural diagram of the present invention after removing the maintenance door;

[0043] Figure 3 is a schematic structural diagram of the maintenance door of the present invention;

[0044] Figure 4 is a schematic structural diagram of the filter bin of the present invention Figure 1 ;

[0045] Figure 5 is a schematic structural diagram of the filter bin of the present invention Figure 2 ;

[0046] Figure 6 is a schematic structural diagram of the disturbing mechanism of the present invention Figure 1 ;

[0047] Figure 7 is a schematic structural diagram of the disturbing mechanism of the present invention Figure 2 ;

[0048] Figure 8 is a schematic structural diagram of the layering member of the present invention;

[0049] Figure 9 is a schematic structural diagram of the isolation strip of the present invention;

[0050] Figure 10 is a schematic structural diagram of the discharging mechanism of the present invention.

[0051] In the drawings, the list of components represented by each reference numeral is as follows:

[0052] 1. Filter bin;

[0053] 11. First guide plate; 12. Second guide plate; 13. Slag discharge channel; 14. Drain pipe; 15. Discharge hopper; 151. Mounting seat;

[0054] 2. Layering member;

[0055] 21. Filter holes; 22. Ear plates;

[0056] 3. Isolation strip; 31. Positioning block;

[0057] 4. Disturbing mechanism;

[0058] 41. Motor; 42. First drive shaft; 43. Flap; 44. Angle fitting; 441. Rack;

[0059] 5. Discharging mechanism;

[0060] 51. Second drive shaft; 52. Positioning seat; 521. Limit groove; 522. Angle limit block; 53. Blanking plate; 531. Through groove; 532. Through hole; 54. Baffle;

[0061] 6. Support frame; 61. Dust cover; 62. Maintenance door; 621. Cooling fan. Specific embodiments

[0062] In order to make the purpose and advantages of the present invention clearer, the present invention will be specifically described below in conjunction with embodiments. It should be understood that the following text is only used to describe one or several specific implementation manners of the present invention, and does not strictly limit the scope of protection specifically claimed by the present invention.

[0063] Embodiment 1:

[0064] Refer to Figures 1 - 10, A filtering device for extracting Dunaliella salina, including a support frame 6; the support frame 6 is made of stainless steel 304 material, having good corrosion resistance and structural stability. Inside the support frame 6, there is a filtering chamber 1; the main structure of the filtering chamber 1 is a cylindrical structure, made of high-strength polypropylene material, with acid and alkali resistance and corrosion resistance characteristics; inside the filtering chamber 1, there are a stratifying member 2 and a disturbing mechanism 4; the stratifying member 2 is arranged at the middle and lower part of the filtering chamber 1, used to achieve the stratified filtration of Dunaliella salina and impurities; the disturbing mechanism 4 is located above the stratifying member 2, and the disturbing mechanism 4 is used to stir the Dunaliella salina in the filtering chamber 1 in all directions, so that the Dunaliella salina particles release impurities under stirring and are evenly mixed in the cleaning liquid; inside the filtering chamber 1, there is also a discharging mechanism 5, and the discharging mechanism 5 is installed in the lower area of the filtering chamber 1, used to discharge the filtered Dunaliella salina from the filtering chamber 1 after stirring; the discharging mechanism 5 and the disturbing mechanism 4 are synchronously linked through a chain drive assembly. The chain is made of 45# steel material and is carburized and quenched to improve wear resistance. The sprocket shaft is provided with rolling bearings to ensure stable operation; when the equipment is in operation, the pretreated Dunaliella salina is put into the filtering chamber 1 through the top opening, and at the same time, deionized water cleaning liquid with a mass ratio of 1:5 to the Dunaliella salina is added to the filtering chamber 1; the disturbing mechanism 4 is driven by the motor 41 to start mechanical stirring of the Dunaliella salina. Through the turning plate 43 and the angle piece 44, a turbulent flow vortex effect is formed during rotation, so that the sediment impurities adsorbed on the surface of the Dunaliella salina are quickly peeled off; the impurities fall onto the stratifying member 2 under the action of gravity, and part of them settle to the bottom of the filtering chamber 1 through the filtering holes 21; the bottom is connected to the drain pipe 14 through the slag discharge channel 13 to realize the unified discharge of the residue liquid, and the rough filtration and cleaning step of Dunaliella salina is completed.

[0065] Refer to Figures 6 - 10 , The disturbing mechanism 4 includes a motor 41 installed on the outer wall of the filtering chamber 1. The motor 41 is an AC gear reduction motor with a rated power of 750W and a speed of 1400rpm, having the characteristics of large torque, stable operation and low noise; the output end of the motor 41 is connected to the first driving shaft 42 located inside the filtering chamber 1 through a flange. The first driving shaft 42 is made of alloy steel hollow structure with a diameter of 20mm, and a plurality of turning plates 43 arranged in a spiral shape are welded on the outer side of the shaft. Each turning plate 43 is made of stainless steel plate with a thickness of 3mm, used to disturb the Dunaliella salina material during rotation; angle pieces 44 are welded at both ends of the turning plate 43. The angle pieces 44 are in an L-shaped structure, used to push the Dunaliella salina to move to the side during rotation. At the same time, racks 441 are equidistantly installed along the length direction on the angle pieces 44, used to clean the filtering holes; the motor 41 drives the first driving shaft 42 to rotate in the clockwise direction, driving the turning plates 43 and the angle pieces 44 to do circular disturbing stirring in the filtering chamber 1, so that the Dunaliella salina particles are dispersed and the cleaning process is completed during stirring, and the surface sediment impurities are quickly peeled off and settled.

[0066] Refer to Figures 6 - 10, the cross-section of the layered member 2 is set as a semi-annular structure, the inner diameter is matched with the inner diameter of the filtration chamber 1, and the center of the layered member 2 is precisely aligned with the axis of the first drive shaft 42 to achieve a symmetric arrangement; the layered member 2 is made of polytetrafluoroethylene material with a thickness of 6 mm, having high strength and corrosion resistance; isolation strips 3 are equidistantly installed on the upper end surface of the layered member 2 along its length direction. Each isolation strip 3 has a length of 60 mm, a width of 8 mm, and a height of 10 mm, mainly used for limiting and separating impurities to prevent the sedimented impurities from being re-suspended by the water flow during disturbance; racks 441 are equidistantly arranged on the angle member 44. The racks 441 are molded from PA66 modified nylon material, having wear resistance and flexibility. When the angle member 44 rotates, the racks 441 will engage with the isolation strips 3 alternately and sweep the impurities therebetween, pushing the impurities deposited between the isolation strips 3 into the uniformly distributed filtration holes 21 opened on the layered member 2; the diameter of the filtration holes 21 is set to 3 mm, and the distribution density is 25 holes per 100 square centimeters, facilitating the sedimentation of Dunaliella salina residues to the bottom of the filtration chamber 1, avoiding blockage and improving the filtration efficiency.

[0067] Refer to Figures 7 - 10 , a positioning block 31 is provided at the bottom of the isolation strip 3. The positioning block 31 is a rectangular structure with dimensions of 10 mm × 5 mm × 4 mm, and is inserted and installed in the corresponding limit holes of the layered member 2 to ensure that the isolation strip 3 does not shift during operation; ear plates 22 are fixedly connected to both sides of the layered member 2. The ear plates 22 are made of stainless steel plates with a thickness of 3 mm and are installed and fixed on the inner wall of the filtration chamber 1 by M6 screws, ensuring that the layered member 2 is firmly installed, easy to disassemble, and has a reliable structure.

[0068] Refer to Figure 10, a discharge hopper 15 is provided on the outer side of the filtration bin 1. The discharge hopper 15 adopts a conical structure, with a longitudinal section being a standard funnel shape. The diameter of the upper opening is 250 mm, and the diameter of the bottom discharge port is 50 mm. The discharge hopper 15 is injection-molded from a polypropylene blend modified material, having good corrosion resistance and impact resistance. At the top inside the discharge hopper 15, there is a mounting seat 151 for fixing the discharge mechanism 5. The mounting seat 151 is a rectangular steel structure with dimensions of 160 mm × 60 mm × 20 mm. The discharge mechanism 5 is installed on the mounting seat 151. The discharge mechanism 5 includes a second drive shaft 51. The second drive shaft 51 is made of 20CrMnTi carburizing steel, with a diameter of 18 mm, and is used to drive the positioning seat 52 to rotate. Along the axial direction of the outer side of the positioning seat 52, 4 limiting grooves 521 are equally spaced. Each limiting groove 521 has a width of 20 mm and a length of 60 mm, and a blanking plate 53 is rotatably connected inside. The blanking plate 53 is made of aluminum alloy material and is treated by oxidation, having the characteristics of light weight and corrosion resistance. On the upper surface of the blanking plate 53, 3 through grooves 531 are evenly opened. The through grooves 531 have a width of 6 mm and a length of 50 mm. At the edge of each limiting groove 521, an angle limiting block 522 is fixedly connected. The angle limiting block 522 adopts an ABS injection-molded part structure, and provides support for the blanking plate 53 when the positioning seat 52 rotates clockwise, so that the blanking plate 53 flips into the discharge hopper 15 to complete the discharging process.

[0069] Refer to Figure 10 , one end of the blanking plate 53 is provided with a through hole 532 with a diameter of 8 mm, which is used to install a pin for realizing rotatable connection. At both ends of the positioning seat 52, there are baffles 54. The baffles 54 are disc structures, processed from stainless steel 304, with a thickness of 5 mm and an outer diameter of 80 mm. The blanking plate 53 is rotatably connected between the two baffles 54 through a Φ6 mm high-strength pin to ensure stable blanking without jamming.

[0070] Refer to Figures 1 - 10 , dust covers 61 are provided on both outer sides of the support frame 6. The dust covers 61 are made of transparent polycarbonate plates with a thickness of 3 mm, and are used to prevent external dust from entering the equipment. An access door 62 is opened on the dust cover 61. The access door 62 has dimensions of 180 mm × 100 mm and is hinged to the dust cover 61 through a rotating shaft. A cooling fan 621 is installed on the access door 62. The cooling fan 621 is an axial flow fan with a diameter of 120 mm and a rated voltage of 24V, and is used to dissipate heat from heat sources such as motors during the operation of the equipment to prevent the equipment from overheating.

[0071] Refer to Figures 1 - 3, inside the filtration chamber 1, a first flow deflector 11 and a second flow deflector 12 are provided. Both the first flow deflector 11 and the second flow deflector 12 are arranged in the area directly below the layering member 2 and are arranged in a serrated staggered structure; the thickness of the flow deflector is 2 mm, the material is hard PVC, and the arrangement angle is inclined at 45 degrees; the first flow deflector 11 and the second flow deflector 12 are arranged in an alternating manner to form a flow direction guiding structure in the disturbed flow field, effectively suppressing the sedimentation impurities during water flow disturbance and preventing the impurities from resuspending.

[0072] Refer to Figures 1 - 4 , at the bottom of the filtration chamber 1, a slag discharge channel 13 is provided. The width of the slag discharge channel 13 is 30 mm, which penetrates the transverse structure at the bottom of the filtration chamber 1; outside the lower part of the filtration chamber 1, a liquid discharge pipe 14 is provided. The inner diameter of the liquid discharge pipe 14 is 20 mm and the length is 300 mm, which is externally connected to a waste liquid collection container and is integrally composed of acid and alkali resistant PVC hose, used to uniformly discharge the liquid and sediment at the bottom to the recovery unit.

[0073] Example 2: Dunaliella salina cleaning structure with active disturbance and stirring function

[0074] In the filtration equipment used in this example, a complete set of disturbance mechanisms is provided, specifically including a 750W AC gear reduction motor of model Y90S-4, a Φ20mm alloy steel first drive shaft connected to the output end of the motor shaft, and 3 groups of flap plates welded on the drive shaft in a spiral manner. The flap plates have a size of 300 mm in length, 50 mm in width, and 3 mm in thickness, and the material is stainless steel 304. Angle members are symmetrically welded at both ends of the flap plates. The angle members adopt an L-shaped structure with a side length of 100 mm; when the equipment is working, the motor rotates at a speed of 120 rpm, driving the flap plates and angle members to disturb the Dunaliella salina and the cleaning liquid to form a three-dimensional flow field, increasing the flipping frequency and direction change of Dunaliella salina particles, and enhancing the surface impurity peeling effect; by detecting the β-carotene content of Dunaliella salina before and after cleaning, the dry weight of impurities after cleaning decreases by about 85%, and the cleaning time is shortened from 12 minutes in the original process to 5 minutes.

[0075] In the comparative case, the traditional static method is used in combination with an intermittent one-way stirring rod for cleaning, only slowly stirring in the horizontal plane, without forming a disturbed flow field. There is more sediment remaining on the surface of Dunaliella salina, the cleaning is not thorough, the extraction rate of β-carotene is low, the cleaning time is long and the efficiency is low, the equipment occupies a large area, the operation is complex, and it cannot meet the requirements of pilot or continuous production.

[0076] Example 3: Layered filtration structure with self-cleaning function

[0077] In this embodiment, a semicircular layered component is provided in the filter bin. The layered component is made of polytetrafluoroethylene sheet with a thickness of 6mm and a radius matching the inner diameter of the filter bin. A circular hole with a diameter of 3mm is provided on the layered component, and the hole spacing is 20mm. A total of 240 filter holes are provided, which are evenly distributed along the circumference. An isolation strip is installed on its upper surface. The isolation strip is made of nylon 66 with a spacing of 30mm. A rectangular positioning block is provided at the bottom of each isolation strip and is inserted into the limiting groove of the layered component. A rack is provided on the corner piece along the length direction. The rack and the isolation strip are arranged alternately. When the corner piece rotates, the rack can accurately sweep the gap between the isolation strips and push the deposited impurities into the filter hole to avoid clogging of the filter hole. The equipment can run continuously for 6 hours without manual cleaning. After cleaning, the permeability of the filter hole remains above 96%.

[0078] In the comparative case, a single flat filter screen is used without a rack-assisted cleaning structure. Impurities are easily accumulated on the filter surface, and the machine needs to be shut down for manual cleaning every 40 minutes. The operation is cumbersome and affects the production rhythm, and the continuous operation capability is poor.

[0079] Example 4: Diversion structure for stable sedimentation of bottom impurities

[0080] In this embodiment, a staggered first guide plate and a second guide plate are arranged at the bottom of the filter bin, each guide plate is 350 mm long, 50 mm wide, 2 mm thick, with an inclination angle of 45° and a staggered spacing of 40 mm; the guide plate is made of PVC corrosion-resistant hard plate and is fixed to the structural support below the layered component by welding; the fine residues falling off during the stirring of the salt algae slowly settle under the disturbance of the cleaning liquid, and are guided by the guide plates to move in a directional manner to the residue discharge channel area, thereby avoiding secondary suspension or mixing into the cleaned salt algae due to water flow disturbance; through the detection of deposited particles, the average radial offset of the particles is reduced by 70%, and the bottom residue is concentrated.

[0081] The comparative case uses a flat-bottom container without a guide structure. The stirring process generates circulation disturbances that make it difficult for impurities to settle, reduce filtration efficiency, and cause uneven accumulation at the bottom, which affects smooth slag discharge and requires frequent opening of the bottom valve for flushing.

[0082] Example 5: Structural collaborative design of disturbance and discharge action linkage

[0083] In this embodiment, the perturbation mechanism and the discharging mechanism are linked through a Z-shaped chain (model #40, pitch 12.7 mm), and two tension wheels are installed to maintain stable tension; the discharging mechanism includes a second drive shaft, a positioning seat, a limiting groove, a blanking plate and a limiting block. The positioning seat is made of aluminum alloy, with 4 limiting grooves arranged on the outer periphery, and a blanking plate is connected inside each groove; the surface of the blanking plate is provided with a through groove for reducing the resistance of discharging, and the rotation angle is controlled by an angle limiting block; when the stirring is completed, the angle piece that continues to rotate drives the Dunaliella salina to be pushed onto the blanking plate, and the blanking plate flips downward under the action of the angle limiting block, quickly pouring the Dunaliella salina into the lower discharging hopper; the whole process is completed synchronously, improving the discharging efficiency and avoiding the occurrence of misdischarging when the stirring is not completed.

[0084] In the comparative case, the stirring and discharging structures are controlled separately and are not linked to each other. It is necessary to manually judge when the stirring is completed and then start the discharging separately, which has problems such as dislocation and premature discharging of incompletely cleaned Dunaliella salina, resulting in large fluctuations in the subsequent extraction efficiency.

[0085] Example 6: Design of an efficient slag and liquid discharging structure

[0086] In this embodiment, a slag discharging channel with a width of 30 mm is arranged at the bottom of the filter bin to connect to an external liquid discharging pipe. The liquid discharging pipe is made of corrosion-resistant PVC pipe with an inner diameter of 20 mm, and the discharging rhythm is controlled by an adjusting valve; the bottom of the slag discharging channel is designed with a 6° inclined plane with the bin bottom to facilitate the aggregation and flow of impurities; after each operation of the equipment, the bottom residue and waste liquid can be directly emptied by gravity, and the discharging time does not exceed 90 seconds, and the emptying rate reaches 98%; this structure supports continuous operation for 12 hours without interruption for cleaning, greatly improving the operation stability of the whole line.

[0087] In the comparative case, a flat bottom design is adopted, and only one bottom valve is provided. There is no guidance for the deposition of impurities, often blocking the valve port, and the liquid discharging is not smooth. It is necessary to regularly insert a tube for manual cleaning, with a long cleaning cycle and inconvenient operation.

[0088] Example 7: Support frame structure with closed protection and temperature control functions

[0089] In this embodiment, dust covers are installed on both sides of the support frame. The dust covers are made of 3-mm thick transparent PC plates, and magnetic sealing strips are provided at the edges; an inspection door with a size of 180 mm × 100 mm is provided on the dust cover, and an axial flow cooling fan (24V, air volume 160 CFM) with a diameter of Φ120 mm is embedded in the door; when the motor is running, the temperature rise is controlled below 45°C. The inside of the equipment can be visually observed and dust can be prevented from entering, which is suitable for various complex environments such as farms and factories; with double protection of temperature control and dust prevention, the continuous operation stability of the equipment is improved by 30%, and the motor overheat failure rate is reduced by 80%.

[0090] In the comparative case, there is no dust-proof structure, the motor is exposed, and it is easily corroded by humid and salt spray environments; in summer, the motor temperature rises too fast during continuous operation, and intermittent cooling is required, restricting the operation rhythm of the equipment and prone to failure shutdown.

[0091] A Dunaliella salina extraction process, comprising the following steps:

[0092] S1. Put the Dunaliella salina to be filtered into the filter bin 1, and add a cleaning solution to the filter bin 1; the input Dunaliella salina is from artificial collection or sampling in a culture pond, and the Dunaliella salina concentration is controlled to contain about 50 g of wet algae per liter of water body; the cleaning solution is purified water or deionized water, the water temperature is controlled at about 25 °C, and the liquid volume to Dunaliella salina mass ratio is controlled to be 5:1; the filter bin 1 is made of high-strength polypropylene, with a volume of 60 L and a top opening diameter of 300 mm, facilitating manual or automatic feeding; to ensure uniform cleaning, after the Dunaliella salina and the cleaning solution are fed, they need to be left standing for 2 minutes to fully mix and infiltrate, so as to realize impurity stripping during subsequent stirring treatment.

[0093] S2. Start the disturbance mechanism 4, drive the first drive shaft 42, the flap 43 and the angle piece 44 to rotate by the motor 41, stir the Dunaliella salina, and make the impurities attached to its surface fall off; the motor 41 is a 750 W AC gear reduction motor, with a rotation speed set at 120 rpm, and transmits power to the flap 43 and the angle piece 44 through the first drive shaft 42; the width of the flap 43 is 50 mm, the thickness is 3 mm, and it is distributed along the spiral around the first drive shaft 42, forming a three-layer layout in the vertical direction; the angle piece 44 is connected to both ends of the flap 43, adopts an L-shaped structure, drives the Dunaliella salina water body to form a flow disturbance through rotation, the flap 43 pushes the Dunaliella salina particles to turn up and down, and the angle piece 44 prompts it to migrate radially, and the impurities are desorbed and suspended under the action of hydraulic disturbance and shear force; the stirring time is controlled to be 5 minutes to ensure that most of the impurities are separated from the Dunaliella salina.

[0094] S3. The impurities fall onto the stratifying member 2, and part of the impurities settle to the bottom of the filter bin 1 through the filter holes 21 on the stratifying member 2. Under the guiding action of the first guide plate 11 and the second guide plate 12, the impurities are prevented from suspending; the stratifying member 2 is made of polytetrafluoroethylene, with a semicircular ring cross-section, and is fixed in the middle of the filter bin 1. The aperture of the filter hole 21 is 3 mm, and the distribution density is 25 holes per 100 cm 2 25 holes are opened; the fallen impurities are deposited on the surface of the stratifying member 2 along the water flow under the action of gravity. Due to the combined arrangement of the stratifying member 2, the first guide plate 11 and the second guide plate 12 to form a multi-layer flow field, the settled impurities are less disturbed, so as to be stably accumulated at the bottom of the filter bin 1; the first guide plate 11 and the second guide plate 12 are arranged in an alternating manner, with a spacing of 30 mm and an inclination angle of 45°, effectively preventing the eddy current generated during the stirring process from driving the impurities again.

[0095] S4. During the stirring process, the rack 441 on the corner fitting 44 sweeps the gap between the isolation bars 3, sweeping the impurities accumulated at the gap into the filter holes 21 to prevent the blockage of the filter holes 21. When the corner fitting 44 rotates in the circumferential direction, the rack 441 meshes with the isolation bars 3 installed on the layering member 2 in an interleaved manner. The rack 441 is made of PA66 modified nylon material, with a length of 80 mm and a spacing of 30 mm. The isolation bar 3 has a length of 60 mm and a width of 8 mm. The rack 441 mechanically sweeps the accumulated slag between the isolation bars 3 during rotation, prompting the impurities to enter the filter holes 21 directionally, preventing the accumulation of impurities from causing local hole blockage, maintaining the smoothness of the filtration process, and improving the filtration efficiency and equipment stability.

[0096] S5. The agitation mechanism 4 and the discharging mechanism 5 are synchronously driven by a chain. After the stirring is completed, the corner fitting 44 continues to rotate clockwise, transferring the filtered Dunaliella salina to the blanking plate 53. Under the supporting action of the angle limit block 522, the blanking plate 53 flips and discharges the Dunaliella salina into the discharging hopper 15. The chain drive system adopts a Z-shaped sprocket drive arrangement, with a chain pitch of 12.7 mm. A tensioning wheel is used between the two mechanisms to ensure synchronous rotation. When the corner fitting 44 rotates to the loading area, it drives some Dunaliella salina to accumulate on the surface of the blanking plate 53. The blanking plate 53 can rotate around the boundary of the limit slot 521 through a pin. The angle limit block 522 functions to adjust the blanking angle and provide support. After rotating clockwise to a specific position, the blanking plate 53 automatically flips around the axis, and the Dunaliella salina slides into the discharging hopper 15 under the action of gravity, and the discharging process is rapid and residue-free.

[0097] S6. The filtered Dunaliella salina is discharged through the discharging port at the bottom of the discharging hopper 15, while the bottom residue is discharged through the slag discharge channel 13 and the drain pipe 14. The inner wall of the discharging hopper 15 is a smooth conical structure, and the inner diameter of the bottom discharging port is 50 mm, which is connected to an external conveying hose. The filtered Dunaliella salina can directly enter the subsequent dehydration or drying system after flowing out by gravity. The bottom residue in the filtration chamber 1 converges to the slag discharge channel 13 after natural sedimentation. The width of the channel 13 is 30 mm, which is connected to the external drain pipe 14. The drain pipe 14 is a PVC hose resistant to acid and alkali with an inner diameter of 20 mm, and the discharge method is gravity discharge combined with a manual control valve to ensure that the equipment can be thoroughly cleaned and the residue can be removed after each operation.

[0098] The working principle of the present invention is as follows:

[0099] During use, the Dunaliella salina to be filtered is put into the interior of the filtration chamber 1 from the top opening end of the filtration chamber 1, and a cleaning liquid is added to the filtration chamber 1.

[0100] Driven by the motor 41, the first drive shaft 42, the flap 43 and the angle member 44 will rotate, and then the Dunaliella salina located inside the filtration chamber 1 can be stirred. During the stirring process of the Dunaliella salina, the impurities on the Dunaliella salina will fall onto the stratifying member 2 inside the filtration chamber 1, and some impurities will sink to the bottom of the filtration chamber 1 through the filtration holes 21 opened on the stratifying member 2;

[0101] The first diversion plate 11 and the second diversion plate 12 arranged alternately at the bottom of the filtration chamber 1 can prevent the impurities falling to the bottom of the filtration chamber 1 from floating in the disturbed water flow;

[0102] When the rack 441 sweeps across the isolation strip 3, the impurities located between adjacent isolation strips 3 will be swept into the filtration holes 21, which can prevent the filtration holes 21 from being blocked during use;

[0103] Since the agitation mechanism 4 and the discharging mechanism 5 are connected by a chain, the agitation mechanism 4 and the discharging mechanism 5 can be rotated synchronously;

[0104] During the clockwise rotation of the angle member 44, the Dunaliella salina after being cleaned inside the filtration chamber 1 will be transferred to the blanking plate 53. When rotating clockwise, the angle limit block 522 will provide support for the blanking plate 53. When the blanking plate 53 rotates into the discharging hopper 15, at this time, under the action of gravity, the Dunaliella salina on the blanking plate 53 will fall into the discharging hopper 15 and be discharged through the discharging port at the bottom of the discharging hopper 15;

[0105] When the discharging mechanism 5 rotates counterclockwise, the angle limit block 522 will not be able to provide support for the blanking plate 53, so as to prevent the Dunaliella salina from being transferred to the blanking plate 53 during the stirring process of the Dunaliella salina in the filtration chamber 1.

[0106] The above is only the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and retouches can be made, and these improvements and retouches should also be regarded as the protection scope of the present invention. The structures, devices and operation methods not specifically described and explained in the present invention, unless otherwise specified and limited, are implemented according to the conventional means in the art.

Claims

1. A filtering device for extracting Dunaliella, comprising a support frame (6), characterized in that: The support frame (6) is provided with a filter chamber (1) inside, and the filter chamber (1) is provided with a layered component (2) and a disturbance mechanism (4) inside; The disturbance mechanism (4) is located above the layering member (2), and the disturbance mechanism (4) is used to stir the salt algae in the filtering chamber (1); A discharge mechanism (5) is also provided inside the filter chamber (1), and the discharge mechanism (5) is used to discharge the filtered salt algae from the filter chamber (1); A chain is connected between the discharge mechanism (5) and the disturbance mechanism (4), and the rotation of the discharge mechanism (5) and the disturbance mechanism (4) are synchronized; When in use, the salt algae to be filtered are put into the filter bin (1), the salt algae are stirred by the discharge mechanism (5), and the filtered salt algae are discharged from the filter bin (1) by the disturbance mechanism (4), while the residue after filtration is discharged from the bottom of the filter bin (1).

2. A filtering device for extracting salt algae according to claim 1, characterized in that: The disturbance mechanism (4) comprises a motor (41) mounted on the outer wall of the filter bin (1); the output end of the motor (41) is connected to a first drive shaft (42) located inside the filter bin (1); the outer side surface of the first drive shaft (42) is connected to a flap (43); and both ends of the flap (43) are connected to angle pieces (44); The motor (41) drives the first drive shaft (42) to rotate, and the first drive shaft (42) drives the flap (43) and the corner piece (44) to rotate in the filter bin (1), and stirs the salt algae in the filter bin (1), so that impurities in the salt algae fall off the salt algae.

3. A filtering device for extracting salt algae according to claim 2, characterized in that: The cross section of the layered member (2) is arranged to be a semicircular ring, and the center of the layered member (2) overlaps with the axis of the first drive shaft (42); The upper end surface of the layered member (2) is provided with isolation strips (3) at equal intervals along its length direction; The corner piece (44) is provided with racks (441) at equal intervals along its length direction. When the corner piece (44) sweeps the layered piece (2), the racks (441) and the isolation strips (3) are arranged in a staggered manner. The upper end surface of the layered member (2) is evenly penetrated with filter holes (21). When filtering the salt algae, the residues falling off the salt algae will enter the bottom of the filter bin (1) through the filter holes (21).

4. A filtering device for extracting salt algae according to claim 3, characterized in that: A positioning block (31) is provided at the bottom of the isolation strip (3); when the isolation strip (3) is connected to the layered component (2), the positioning block (31) is plugged into the layered component (2); Ear plates (22) are fixedly connected to both sides of the layered component (2). When the layered component (2) is installed in the filter bin (1), the ear plates (22) are fixed in the filter bin (1) using screws.

5. The filtration device for extracting salt algae according to claim 1, characterized in that: A discharge hopper (15) is arranged outside the filter bin (1), the longitudinal section of the discharge hopper (15) is arranged in a funnel shape, and a mounting seat (151) is arranged at the top of the inner side of the discharge hopper (15); The discharging mechanism (5) is installed in the mounting seat (151), and the discharging mechanism (5) comprises a second driving shaft (51), a positioning seat (52) is sleeved on the second driving shaft (51), and the outer side of the positioning seat (52) is provided with limiting grooves (521) at equal intervals along the central axis thereof, and each limiting groove (521) is rotatably connected to a blanking plate (53), and the upper part of the blanking plate (53) is evenly penetrated by through grooves (531), and the edge of each limiting groove (521) is fixedly connected to an angle limiting block (522).

6. A filtering device for extracting salt algae according to claim 5, characterized in that: A through hole (532) is formed through one end of the blanking plate (53); Baffles (54) are provided at both ends of the positioning seat (52), and the blanking plate (53) is rotatably connected between the two baffles (54) via a pin.

7. The filtration device for extracting salt algae according to claim 1, characterized in that: Dust covers (61) are provided on both sides of the exterior of the support frame (6), an inspection door (62) is installed on the dust cover (61), and a heat dissipation fan (621) is installed on the inspection door (62).

8. The filtering device for extracting Dunaliella salina according to claim 1, characterized in that: A first guide plate (11) and a second guide plate (12) are arranged inside the filter bin (1); the first guide plate (11) and the second guide plate (12) are both located below the layered element (2); and the first guide plate (11) and the second guide plate (12) are arranged in an alternating manner.

9. The filtering device for extracting salt algae according to claim 8, characterized in that: The bottom of the filter bin (1) is provided with a slag discharge channel (13), and a liquid discharge pipe (14) is provided on the lower outer side of the filter bin (1).

10. A process for extracting Dunaliella, characterized in that: The following steps are involved: S1, putting the salt algae to be filtered into the filter chamber (1), and adding a cleaning liquid into the filter chamber (1); S2, starting the disturbance mechanism (4), and using the motor (41) to drive the first drive shaft (42), the flap (43) and the corner piece (44) to rotate, so as to stir the salt algae and cause impurities attached to the surface to fall off; S3, impurities fall onto the layered element (2), and some of the impurities settle to the bottom of the filter bin (1) through the filter holes (21) on the layered element (2). Under the guiding action of the first guide plate (11) and the second guide plate (12), the impurities are prevented from being suspended; S4. During the stirring process, the rack (441) on the corner piece (44) sweeps the gaps between the isolation strips (3) to sweep the impurities accumulated in the gaps into the filter holes (21) to avoid clogging of the filter holes; S5, the disturbance mechanism (4) and the discharge mechanism (5) are synchronously driven by the chain. When the stirring is completed, the angle piece (44) continues to rotate clockwise to transfer the filtered salt algae to the discharge plate (53). Under the support of the angle limit block (522), the discharge plate (53) turns over and discharges the salt algae into the discharge hopper (15); S6. The filtered salt algae are discharged through the discharge port at the bottom of the discharge hopper (15), and the residue at the bottom is discharged through the residue discharge channel (13) and the liquid discharge pipe (14).

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