Fish oil extraction device and extraction process thereof

Abstract

The present application relates to a kind of fish oil extraction equipment and its extraction process, belong to fish oil extraction technical field, by adopting the synergies of helical guide rail and elastic limiting part, multiple stirring parts are sequentially separated from limiting under the control of driving part and swing in vertical direction, form continuous wave type stirring track, reciprocating activity part and helical guide rail being set in the center of stirring barrel, cooperate with the synergies of elastic limiting part and stirring part, realize the effective stirring of high viscosity fish oil, both realize the uniform mixing and cyclic flow of material, shear force is dispersed into multi-section progressive action, avoid the mechanical damage of traditional high-strength concentrated shearing to protein-phospholipid complex colloid structure, while the buffer characteristics of elastic limiting part further reduce impact stress, solve the problem that the high viscosity of fish oil and its sensitive colloid structure in prior art make traditional high shear stirring easily lead to active ingredient loss and system stability reduction.

Description

Technical Field

[0001] This invention belongs to the field of fish oil extraction technology, specifically relating to a fish oil extraction device and its extraction process. Background Technology

[0002] Fish oil extraction is a crucial step in the aquatic product processing industry. The process must balance efficient concentration with the protection of active ingredients. Traditional fish oil extraction often draws on general concentration equipment used in the food and chemical industries. During the operation of such equipment, in order to prevent fish oil from settling and improve extraction efficiency, a stirring mechanism is usually integrated. Common stirring mechanisms include planetary stirrers, wall-scraping stirrers, turbine stirrers, or high-shear stirrers. Their function is to enhance the uniformity of mixing between the material and the extract, promote circulation, thereby shortening the extraction time and improving efficiency.

[0003] However, the high viscosity of fish oil results in poor flowability, requiring significant shear force for effective mixing. The colloidal structure of fish oil is primarily composed of proteins and phospholipids, which are extremely sensitive to shear force. Traditional high-shear mixing easily disrupts the binding forces between colloidal particles, leading to loss of active ingredients and decreased system stability. To address this issue, the inventors have proposed a novel fish oil extraction device and process that reduces shear force while achieving effective mixing, thus preventing the destruction of the colloidal structure in fish oil, which could result in loss of active ingredients and decreased system stability. Summary of the Invention

[0004] To address the aforementioned problems in the prior art, this invention provides a fish oil extraction device and its extraction process, which solves the problem that the high viscosity and sensitive colloidal structure of fish oil in the prior art easily lead to the loss of active ingredients and reduced system stability due to traditional high-shear stirring.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] A fish oil extraction device includes a crusher, a press, a stirring mechanism, a centrifuge, an evaporator, and a concentration tank arranged sequentially along the fish oil extraction direction. The crusher, press, stirring mechanism, centrifuge, evaporator, and concentration tank are connected sequentially. The stirring mechanism includes a stirring tank, a support part disposed at the central axis of the stirring tank, a reciprocating movable part slidably disposed on the support part along the central axis of the stirring tank, several elastic limiting parts, several stirring parts, guide parts respectively vertically disposed on the several stirring parts, and a drive part for driving the reciprocating movable part to move. The reciprocating movable part is provided with a spiral guide rail, and the guide part is located within the spiral guide rail of the reciprocating movable part. The several elastic limiting parts are vertically disposed on the support part and are used to limit the several stirring parts. The drive part drives the reciprocating movable part to move, and the reciprocating movable part, through the cooperation of the spiral guide rail and the guide part, drives the several stirring parts to sequentially disengage from the limiting of the elastic limiting parts. The stirring parts swing in a direction perpendicular to the support part, so that the several stirring parts form a wave-like stirring trajectory in the stirring tank, effectively stirring the fish oil while reducing shear force.

[0007] As a further embodiment of the present invention, the reciprocating movable part is further provided with two straight guide rails, the spiral guide rail is located between the two straight guide rails and the two ends of the spiral guide rail are respectively connected to the two straight guide rails, and the included angle between the two straight guide rails is 90°.

[0008] As a further embodiment of the present invention, the reciprocating movable part includes an arc-shaped slider and a connecting rod slidably disposed on the support part, the spiral guide rail is disposed on the arc-shaped slider, and the two ends of the connecting rod are respectively connected to the arc-shaped slider and the reciprocating drive part, the reciprocating drive part drives the connecting rod to move linearly.

[0009] As a further embodiment of the present invention, the arc angle of the arc-shaped slider is greater than 90° and less than 180°.

[0010] As a further embodiment of the present invention, the guide part is a guide rod, the stirring part is a stirring block, the guide rod is vertically arranged on the stirring block, and the end of the guide rod located inside the spiral guide rail has an arc-shaped structure.

[0011] As a further embodiment of the present invention, the elastic limiting part includes a limiting rod and a spring, the two ends of the spring being connected to the support part and one end of the limiting rod, respectively, and the stirring block is provided with a plurality of slots, the plurality of slots being engaged with a plurality of limiting rods.

[0012] As a further embodiment of the present invention, the distance between two adjacent guide rods and two adjacent limiting rods is the same.

[0013] As a further embodiment of the present invention, the number of stirring blocks is greater than or equal to four, and two adjacent stirring blocks are in close contact with each other.

[0014] An extraction process for a fish oil extraction device includes the following steps:

[0015] S1: The fish raw material is put into the crusher for crushing and processing to obtain fish paste;

[0016] S2: The fish paste is fed to a press for pressing to separate crude fish oil and fish residue;

[0017] S3: The crude fish oil is subjected to wave-like stirring through a queuing stirring mechanism. The driving part drives the reciprocating moving part to move, so that several stirring parts are successively released from the limit of the elastic limiting part and swing along the vertical direction of the support part to form a wave-like stirring trajectory, thereby reducing shear force.

[0018] S4: The stirred crude fish oil is sent to a centrifuge for oil-water separation to obtain primary fish oil;

[0019] S5: The primary fish oil is passed through an evaporator and a concentration tank in sequence, and then evaporated and concentrated under vacuum conditions to finally obtain refined fish oil.

[0020] As a further embodiment of the present invention, in step S3, a phospholipid protectant with a concentration of 0.5% to 1.5% is added to the mixing tank, and the mixing temperature is adjusted in real time by a temperature controller during the mixing process, with the fluctuation range not exceeding ±2℃.

[0021] The beneficial effects of this invention are as follows:

[0022] By employing the synergistic effect of a spiral guide rail and an elastic limiting part, multiple stirring parts are sequentially disengaged from their limits and oscillate vertically under the control of the drive unit, forming a continuous wave-like stirring trajectory. The reciprocating moving part and spiral guide rail set at the center of the mixing tank, together with the synergistic effect of the elastic limiting part and the stirring parts, achieve effective stirring of high-viscosity fish oil. This dynamic stirring mode, through the superposition of displacement in the spatial dimension, not only achieves uniform mixing and circulation of materials, but also disperses shear force into multiple progressive actions by limiting the movement amplitude and contact time of individual stirring parts. This avoids the mechanical damage to the protein-phospholipid complex colloidal structure caused by traditional high-intensity concentrated shear. At the same time, the buffering characteristics of the elastic limiting part further reduce impact stress, effectively protecting heat-sensitive active ingredients while ensuring extraction efficiency. This solves the problem in existing technologies where the high viscosity and sensitive colloidal structure of fish oil make traditional high-shear stirring prone to loss of active ingredients and reduced system stability. Attached Figure Description

[0023] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0024] Figure 1This is a schematic diagram of the fish oil extraction process of the present invention;

[0025] Figure 2 This is a schematic diagram of the overall structure of the queuing and stirring mechanism of the present invention;

[0026] Figure 3 This is a schematic diagram of the reciprocating movable part of the present invention;

[0027] Figure 4 This is a side view of the arc-shaped slider of the present invention;

[0028] Figure 5 This is a schematic diagram of the stirring section structure of the present invention;

[0029] Figure 6 This is a schematic diagram of the spiral guide rail structure of the present invention;

[0030] Figure 7 This is a schematic diagram of the external structure of the elastic limiting part of the present invention.

[0031] Explanation of key component symbols:

[0032] In the diagram: 11. Mixing tank; 12. Support part; 13. Reciprocating moving part; 131. Arc-shaped slider; 132. Connecting rod; 14. Elastic limiting part; 15. Mixing part; 16. Guide part; 2. Spiral guide rail; 3. Straight guide rail. Detailed Implementation

[0033] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided.

[0034] Please see Figure 1 - Figure 7This embodiment provides a fish oil extraction device, including a crusher, a press, a stirring mechanism, a centrifuge, an evaporator, and a concentration tank arranged sequentially along the fish oil extraction direction. The crusher, press, stirring mechanism, centrifuge, evaporator, and concentration tank are connected sequentially. The stirring mechanism includes a stirring tank 11, a support 12 disposed at the central axis of the stirring tank 11, a reciprocating movable part 13 slidably disposed on the support 12 along the central axis of the stirring tank 11, several elastic limiting parts 14, several stirring parts 15, guide parts 16 respectively vertically disposed on the stirring parts 15, and a drive unit for driving the reciprocating movable part 13. A spiral guide rail 2 is disposed on the reciprocating movable part 13, and the guide parts 16 are located within the spiral guide rail 2 of the reciprocating movable part 13. Several elastic limiting parts 14 are vertically disposed on the support 12 and are used to limit the movement of the stirring parts 15. The drive unit drives the reciprocating movable part 13 to move, and the reciprocating movable part 13 drives the stirring parts 15 through the cooperation of the spiral guide rail 2 and the guide parts 16. The mixing section 15 sequentially disengages from the elastic limiting section 14, and the mixing section 15 swings vertically along the support section 12, so that several mixing sections 15 form a wave-like mixing trajectory within the mixing tank 11, effectively mixing the fish oil while reducing shear force. The spiral guide rail 2 cooperates with the guide section 16 to convert linear reciprocating motion into rotational oscillation, and precisely limits the action angle of the mixing section 15 through trajectory control, reducing the shear intensity per unit area. The elastic limiting section 14 provides flexible constraint, absorbing kinetic energy when the mixing section 15 resets, reducing the mechanical impact on colloidal particles. The staged wave-like mixing, with multiple mixing sections 15 working alternately to form a continuous mixing wave, avoids local overload and enhances the overall fluidity of the material. The vertical sliding structure of the support section 12 enables the mixing section 15 to form a three-dimensional mixing field in three-dimensional space, improving mixing efficiency. The reciprocating moving section 13 drives the dynamic control of shear force through adjustable stroke and frequency, adapting to the characteristics of fish oils with different viscosities. The laminar flow effect generated by the wave-like mixing helps maintain colloidal stability and reduces the risk of emulsification during subsequent centrifugal separation.

[0035] For fish oil extraction equipment, the overall process is as follows: Figure 1As shown, the discharge port of the crusher is connected to the inlet of the press through a first conveying pipe. The discharge port of the press is connected to the inlet of the queuing and stirring mechanism through a second conveying pipe. The queuing and stirring mechanism is connected to the power output end of the press through a transmission device, which drives the queuing and stirring mechanism to rotate. The discharge end of the queuing and stirring mechanism is connected to the inlet of the centrifugal separator through a third conveying pipe equipped with a conveying pump. The liquid phase outlet of the centrifugal separator is connected to the inlet of the evaporator through a fourth conveying pipe. The concentration outlet of the evaporator is connected to the inlet of the concentration tank through a fifth conveying pipe. Specifically, the material enters the press from the crusher through the first conveying pipe. The pressed material enters the queuing and stirring mechanism through the second conveying pipe. The press provides rotational power to the stirring mechanism through the transmission device. The stirred material is pumped into the centrifugal separator through the third pipe of the conveying pump. The liquid separated by centrifugation enters the evaporator through the fourth pipe. The product after evaporation and concentration enters the concentration tank through the fifth pipe.

[0036] Currently, fish oil extraction is a crucial step in the aquatic product processing industry. The process requires balancing efficient concentration with the protection of active ingredients. Traditional fish oil extraction often borrows from general concentration equipment used in the food and chemical industries. During the operation of such equipment, to prevent fish oil sedimentation and improve extraction efficiency, a stirring mechanism is usually integrated. Common stirring mechanisms include planetary stirrers, wall-scraping stirrers, turbine stirrers, or high-shear stirrers. Their function is to enhance the uniformity of mixing between the material and the extract, promote circulation, thereby shortening extraction time and improving efficiency. However, the high viscosity of fish oil results in poor flowability, requiring significant shear force for effective stirring. The colloidal structure of fish oil is mainly composed of proteins and phospholipids, which are extremely sensitive to shear force. Traditional high-shear stirring easily damages the binding force between colloidal particles, leading to loss of active ingredients and decreased system stability.

[0037] To address the aforementioned issues, this embodiment employs the synergistic effect of the spiral guide rail 2 and the elastic limiting part 14. This allows multiple stirring parts 15 to sequentially disengage from the limiting part and oscillate vertically under the control of the drive unit, forming a continuous wave-like stirring trajectory. This dynamic stirring mode, through the superposition of displacements in the spatial dimension, achieves both uniform mixing and circulation of materials. Furthermore, by limiting the movement amplitude and contact time of individual stirring parts 15, the shear force is dispersed into multiple progressive actions, avoiding mechanical damage to the protein-phospholipid composite colloidal structure caused by traditional high-intensity concentrated shear. Simultaneously, the buffering characteristics of the elastic limiting part 14 further reduce impact stress, effectively protecting the heat-sensitive active ingredients while ensuring extraction efficiency. This solves the problem in the prior art where the high viscosity and sensitive colloidal structure of fish oil make traditional high-shear stirring prone to loss of active ingredients and reduced system stability.

[0038] Furthermore, when several stirring sections 15 reciprocate in a wave-like stirring motion, due to the inertia of the reciprocating movable section 13, the instantaneous change of direction of the stirring section 15 during each reciprocating motion causes it to be subjected to a large force, which can easily lead to damage or cause vibrations that affect other components. To solve this problem, in one embodiment, the reciprocating movable section 13 is also provided with two straight guide rails 3, and a spiral guide rail 2 is located between the two straight guide rails 3, with both ends of the spiral guide rail 2 connected to the two straight guide rails 3 respectively. The included angle between the two straight guide rails 3 is 90°. The two straight guide rails 3 are actually set on two movable blocks, which are located at both ends of the arc-shaped slider 131 mentioned below, as shown below. Figure 3 As shown, the two movable blocks and the arc-shaped slider 131 are connected as one unit and slide synchronously along the support part 12. The support part 12 is actually a support block. The straight guide rail 3 and the spiral guide rail 2 help to buffer the impact force generated when the reciprocating movable part 13 changes direction. The spiral shape of the spiral guide rail 2 can gradually guide the movable part to change direction, reducing the instantaneous force. The 90° angle between the two straight guide rails 3 provides good support, ensuring the stability of the reciprocating movable part 13 during movement and reducing the damage to parts caused by vibration. The combination of the straight guide rail 3 and the spiral guide rail 2 can more accurately control the movement trajectory of the reciprocating movable part 13, thereby improving the accuracy of the stirring process. Specifically, the spiral guide rail 2 can provide a gradual force buffer when reciprocating, reducing the large force generated by the instantaneous change of direction. The two movable blocks and the arc-shaped slider 131 are connected as one unit and slide synchronously along the support part 12, further reducing the impact and vibration caused by asynchronous movement. By optimizing the design of the movable part, the influence of inertia on the stirring part 15 is reduced, thereby reducing the force generated when changing direction.

[0039] It should be noted that since this is for stirring high-viscosity fish oil and requires the stirring unit 15 to rotate 90° in each direction, the reciprocating movable part 13 needs to be specially designed to achieve this. In one embodiment, the reciprocating movable part 13 includes an arc-shaped slider 131 and a connecting rod 132 slidably disposed on the support part 12. The spiral guide rail 2 is disposed on the arc-shaped slider 131. The two ends of the connecting rod 132 are respectively connected to the arc-shaped slider 131 and the reciprocating drive part. The reciprocating drive part drives the connecting rod 132 to move linearly. The arc angle of the arc-shaped slider 131 is greater than 90° and less than 180°. The arc-shaped slider 131 enables the stirring arm to cover the entire stirring container more efficiently during the stirring process. When the stirring arm rotates 90° in each direction, the arc-shaped slider 131 ensures that the movement path of the stirring arm is more in line with the shape of the container, thereby improving the stirring effect. The design of the arc-shaped slider 131 makes the stirring device more stable during movement and reduces the shaking that may be caused by linear motion. The arc angle of the arc-shaped slider 131 is greater than 90° and less than 180°. The arc-shaped slider 131 here is actually a part of the cylinder cut off along the top and bottom surfaces. The angle limitation is actually a limitation on the size of the cut-off part of the arc-shaped slider 131. This limitation can ensure that the spiral guide rail 2 opened on the arc-shaped slider 131 can make several stirring parts 15 rotate 90°.

[0040] It is worth mentioning that the several stirring parts 15 actually rotate one by one in sequence, and each stirring part 15 is limited after rotating 90°. This can prevent the stirring part 15 from rotating excessively, effectively reduce unnecessary energy consumption, and achieve more uniform and efficient mixing. However, since the stirring part 15 is limited after rotating 90°, the instantaneous force will cause vibration to the support part 12. Therefore, in order to ensure that each stirring part 15 completes a rotation in one direction after rotating 90°, forming a limit with the support part 12, and at the same time reducing the vibration caused by the instantaneous force to the support part 12, in one embodiment, the guide part 16 is a guide rod, the stirring part 15 is a stirring block, the guide rod is vertically arranged on the stirring block, and the end of the guide rod located inside the spiral guide rail 2 has an arc-shaped structure. The elastic limiting part 14 includes a limiting rod and a spring, such as... Figure 7As shown, the limiting rod is visible. The spring is located inside the support part 12, so it is not shown in the figure. The structure here is easy to understand based on the text description. The two ends of the spring are connected to the support part 12 and one end of the limiting rod, respectively. Several slots are provided on the stirring block, and the slots engage with several limiting rods. The distance between two adjacent guide rods and two adjacent limiting rods is the same. On the one hand, this can help improve the overall structural stability of the equipment. On the other hand, it can ensure that the rotation of the stirring rod and the limiting will not interfere with each other due to improper hole position and guide rail fit. The number of stirring blocks is greater than or equal to four. The two adjacent stirring blocks are in close contact with each other. First, the close contact of multiple stirring blocks can form a tighter stirring area, increasing the contact area between materials, thereby improving stirring efficiency and making the mixing more uniform. In addition, the increase in the number of stirring blocks and the close contact between adjacent blocks help to form a more complex flow pattern, which helps to achieve more thorough mixing. The close contact design can also reduce the dead zone of materials during the stirring process, especially when dealing with viscous or difficult-to-mix materials. This design is designed for the high viscosity characteristics of fish oil.

[0041] An extraction process for a fish oil extraction device includes the following steps:

[0042] S1: The fish raw material is put into the crusher for crushing to obtain fish paste. During the crushing process, the cell structure of the fish raw material is destroyed, which is conducive to the release of oil. The crushing process is conducive to the release of oil, creating conditions for the subsequent pressing and separation process.

[0043] S2: The fish paste is transported to the press for pressing to separate crude fish oil and fish residue. During the pressing process, the oil in the fish paste is squeezed out to form crude fish oil, while the fish residue is separated.

[0044] S3: The crude fish oil is subjected to wave-like stirring through a queuing stirring mechanism. The reciprocating moving part 13 is driven by the drive unit to move, so that several stirring parts 15 are successively released from the limit of the elastic limiting part 14 and swing along the vertical direction of the support part 12 to form a wave-like stirring trajectory, thereby reducing shear force. This stirring method is conducive to the separation of oil and water and reduces the emulsification of oil.

[0045] S4: The stirred crude fish oil is sent to a centrifuge for oil-water separation to obtain primary fish oil. The centrifuge generates centrifugal force through high-speed rotation to quickly separate the oil and water, thereby improving the separation efficiency.

[0046] S5: The primary fish oil is passed through an evaporator and a concentration tank in sequence, and then evaporated and concentrated under vacuum conditions to finally obtain refined fish oil. During the evaporation and concentration process, the water and impurities in the primary fish oil are removed, improving the purity and quality of the fish oil. Evaporation and concentration under vacuum conditions help to preserve the nutrients in the fish oil.

[0047] Furthermore, during fish oil extraction, oil and water easily form emulsions, which increases the difficulty of subsequent separation. Simultaneously, phospholipids in fish oil are easily damaged by shear forces during stirring. Besides using a wave-like stirring mechanism to reduce shear forces, to further protect phospholipids from damage, in one embodiment, in step S3, a phospholipid protectant with a concentration of 0.5% to 1.5% is added to the stirring tank 11. During stirring, the stirring temperature is adjusted in real-time by a temperature controller, with fluctuations not exceeding ±2℃. Adding the phospholipid protectant can prevent phospholipid damage. By controlling the stirring temperature, the damage to nutrients in fish oil caused by high temperatures can be reduced, maintaining the quality of the fish oil. By reducing emulsification and shear forces, the phospholipids and other nutrients in the fish oil are protected, thereby maintaining the quality of the fish oil. Real-time adjustment of the stirring temperature... Temperature helps maintain process stability, making product quality more reliable. In addition, in step S5, the fish oil after evaporation and concentration undergoes secondary separation and filtration through an oil-water separator and filter with a filter screen precision of 5μm-10μm. The finished product is then collected in a vacuum collection tank. Since the primary fish oil may still contain moisture and impurities, further removal is necessary to improve the purity and quality of the fish oil. Filtration removes fine particles and impurities, ensuring the safety and stability of the fish oil product. Evaporation and concentration remove moisture and impurities, improving the purity of the fish oil. Evaporation and concentration under vacuum conditions help reduce the damage of high temperatures to nutrients. Secondary separation and filtration further optimize the quality of the fish oil product, meeting the high standards of consumer demand. The use of filters helps remove any microorganisms and other harmful substances that may be present, ensuring the food safety of the fish oil product.

[0048] The working process and principle of this invention:

[0049] In use, the material first enters the press from the crusher through the first conveying pipe. The pressed material enters the queuing and stirring mechanism through the second conveying pipe. The press provides rotational power to the stirring mechanism through the transmission device. The stirred material is pumped into the centrifugal separator through the third conveying pump. The liquid separated by centrifugation enters the evaporator through the fourth pipe. The product after evaporation and concentration enters the concentration tank through the fifth pipe.

[0050] A spiral guide rail 2 is provided on the reciprocating movable part 13, and a guide part 16 is vertically arranged on the stirring part 15 and embedded in the spiral guide rail 2. An elastic limiting part 14 is vertically arranged on the support part 12 to limit the movement of the stirring part 15. When the drive unit drives the reciprocating movable part 13 to move linearly, the spiral guide rail 2 cooperates with the guide part 16 to convert the linear motion into the rotational oscillation of the stirring part 15, so that multiple stirring parts 15 successively disengage from the limiting part 14 and oscillate along the vertical direction of the support part 12, forming a wave-like stirring trajectory. The trajectory control of the spiral guide rail 2 precisely limits the action angle of the stirring part 15, reducing the shear strength per unit area. The elastic limiting part 14 provides flexible constraint through springs and limiting rods, absorbing kinetic energy when the stirring part 15 resets, reducing the mechanical impact on colloidal particles. Multiple stirring parts 15 oscillate alternately to form a continuous stirring wave, avoiding local overload and enhancing material flowability. Each stirring part 15 After rotating 90°, the limit rod engages with the slot to limit the rotation and prevent excessive rotation. The reciprocating movable part 13 includes an arc-shaped slider 131 and a connecting rod 132. The arc-shaped slider 131 is equipped with a spiral guide rail 2, and its two ends are connected to the movable block through two straight guide rails 3. The combination of the straight guide rails 3 and the spiral guide rails 2 buffers the impact force during the direction change, reducing vibration and damage to parts. The arc-shaped path of the arc-shaped slider 131 ensures that the stirring part 15 efficiently covers the stirring container, improving stability. The vertical sliding structure of the support part 12 enables the stirring part 15 to form a three-dimensional stirring field in three-dimensional space, improving mixing efficiency. The drive part achieves dynamic control of shear force by adjusting the stroke and frequency, adapting to the characteristics of fish oils with different viscosities.

[0051] In the extraction process, the fish raw material is fed into a crusher to break it into fish paste, destroying the cell structure to release oil. The fish paste is then pressed by a press to separate crude fish oil from fish residue. The press extracts oil step by step through three stages of pressure enhancement. The crude fish oil enters a queuing stirring mechanism. The drive unit controls the stirring unit 15 to form a wave-like trajectory, reducing shear force and minimizing the damage to the phospholipid-protein colloidal structure. Simultaneously, 0.5% to 1.5% phospholipid protectant is added, and the stirring temperature fluctuation is maintained at ≤±2℃ by a temperature controller. After stirring, the material is separated into primary fish oil by a centrifuge. The primary fish oil is then dehydrated in an evaporator, and after being finely filtered through a 5μm-10μm filter, it enters a concentration tank to finally obtain refined fish oil.

[0052] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A fish oil extraction device, characterized in that, The system includes a crusher, a press, a stirring mechanism, a centrifuge, an evaporator, and a concentration tank arranged sequentially along the fish oil extraction direction. These components are connected in sequence. The stirring mechanism includes a stirring tank, a support portion positioned at the central axis of the stirring tank, a reciprocating movable portion slidably mounted on the support portion along the central axis of the stirring tank, several elastic limiting portions, several stirring portions, guide portions perpendicularly mounted on the stirring portions, and a drive unit for driving the reciprocating movable portion. A spiral guide rail is provided on the reciprocating movable portion, and the guide portion is located within the spiral guide rail. The elastic limiting portions are perpendicularly mounted on the support portion and are used to limit the movement of the stirring portions. The drive unit drives the reciprocating movable portion, which, through the cooperation of the spiral guide rail and the guide portion, drives the stirring portions to sequentially disengage from the elastic limiting portions. The stirring portions oscillate along a direction perpendicular to the support portion, creating a wave-like stirring trajectory within the stirring tank, effectively stirring the fish oil while reducing shear force. The reciprocating movable part is also provided with two straight guide rails, and the spiral guide rail is located between the two straight guide rails and the two ends of the spiral guide rail are respectively connected to the two straight guide rails. The included angle between the two straight guide rails is 90°. The guide part is a guide rod, the stirring part is a stirring block, the guide rod is vertically arranged on the stirring block, and the end of the guide rod located inside the spiral guide rail has an arc-shaped structure; The elastic limiting part includes a limiting rod and a spring. The two ends of the spring are respectively connected to the support part and one end of the limiting rod. The stirring block is provided with a plurality of slots, and the plurality of slots are respectively engaged with a plurality of limiting rods. The number of stirring blocks is greater than or equal to four, and adjacent stirring blocks are in close contact with each other.

2. The fish oil extraction equipment according to claim 1, characterized in that, The reciprocating movable part includes an arc-shaped slider and a connecting rod that are slidably disposed on the support part. The spiral guide rail is disposed on the arc-shaped slider. The two ends of the connecting rod are respectively connected to the arc-shaped slider and the reciprocating drive part. The reciprocating drive part drives the connecting rod to move linearly.

3. The fish oil extraction equipment according to claim 2, characterized in that, The arc angle of the arc-shaped slider is greater than 90° and less than 180°.

4. The fish oil extraction equipment according to claim 1, characterized in that, The distance between two adjacent guide rods and two adjacent limit rods is the same.

5. An extraction process for a fish oil extraction device, based on the fish oil extraction device according to any one of claims 1-4, characterized in that, Includes the following steps: S1: The fish raw material is put into the crusher for crushing and processing to obtain fish paste; S2: The fish paste is fed to a press for pressing to separate crude fish oil and fish residue; S3: The crude fish oil is subjected to wave-like stirring through a queuing stirring mechanism. The driving part drives the reciprocating moving part to move, so that several stirring parts are successively released from the limit of the elastic limiting part and swing along the vertical direction of the support part to form a wave-like stirring trajectory, thereby reducing shear force. S4: The stirred crude fish oil is sent to a centrifuge for oil-water separation to obtain primary fish oil; S5: The primary fish oil is passed through an evaporator and a concentration tank in sequence, and then evaporated and concentrated under vacuum conditions to finally obtain refined fish oil.

6. The extraction process of the fish oil extraction equipment according to claim 5, characterized in that, In step S3, a phospholipid protectant with a concentration of 0.5% to 1.5% is added to the mixing tank. During the mixing process, the mixing temperature is adjusted in real time by a temperature controller, and the fluctuation range does not exceed ±2℃.

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