A kind of decolorization production equipment for epoxy soybean oil plasticizer

Abstract

The present application relates to the technical field of production equipment for epoxy soybean oil plasticizer, and discloses a production equipment for decolorization of epoxy soybean oil plasticizer, which comprises a tank body and a feeding port arranged on the tank body, a driving assembly is arranged on the tank body, and an observation window is further arranged on the tank body, and the production equipment further comprises a hollow outer shaft rotatably arranged on the tank body, an inner shaft coaxially arranged in the hollow outer shaft and rotatably connected with the tank body, the hollow outer shaft and the inner shaft rotate in opposite directions under the drive of the driving assembly, an upper stirring paddle fixedly arranged on the hollow outer shaft, a lower stirring paddle rotatably arranged on the inner shaft, and a mixing and lifting assembly, wherein the production equipment eliminates the problems of excessively high or low local concentration of the decolorizing agent, uneven contact between the oil body and the decolorizing agent in the traditional equipment, ensures that the materials at the top, middle and bottom of the tank can fully contact with the decolorizing agent, greatly increases the specific surface area of the liquid, and thus significantly improves the decolorization efficiency and the uniformity of the color of the product.

Description

Technical Field

[0001] This invention relates to the technical field of equipment for producing epoxidized soybean oil plasticizers, specifically to a decolorization production equipment for epoxidized soybean oil plasticizers. Background Technology

[0002] Epoxidized soybean oil is a widely used environmentally friendly plasticizer with good thermal and light stability. Decolorization is a crucial step in the production of epoxidized soybean oil, directly affecting the product's color quality and market value.

[0003] Existing epoxidized soybean oil decolorization equipment mostly employs single-shaft stirring or simple double-layer counter-current stirring. While these methods can generate some vortex collision effects, dead mixing zones easily form at the bottom and top of the tank, resulting in slow liquid surface renewal and insufficient, uneven contact between the decolorizing agent (usually a hydrogen peroxide aqueous solution) and the oil, leading to low decolorization efficiency. Furthermore, traditional equipment lacks a forced three-dimensional circulation mechanism, failing to achieve efficient mixing throughout the entire tank. Additionally, the nozzles on the rotating disc typically have fixed openings, unable to adapt to dynamic changes in material viscosity between different batches of raw materials during the reaction process. At high viscosity, the spray volume is insufficient, while at low viscosity, the atomization effect is unsatisfactory. The lower stirring blades only perform a single revolution, easily creating a low-speed stagnation zone near the tank bottom, where colloidal flocs tend to adhere and accumulate. Summary of the Invention

[0004] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides a decolorization production equipment for epoxidized soybean oil plasticizers. It features three-dimensional circulating mixing throughout the tank, adaptive nozzle adjustment, and bottom self-cleaning, solving the problems of uneven decolorization caused by mixing dead zones, fixed nozzles unable to adapt to viscosity changes, and bottom stagnation and adhesive adhesion caused by the single revolution of the lower stirring blades in existing equipment.

[0005] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: a decolorization production device for epoxidized soybean oil plasticizer, comprising a tank and a feeding port disposed on the tank, a driving assembly disposed on the tank, and an observation window disposed on the tank, and further comprising: A hollow outer shaft is rotatably mounted on the tank body; The inner shaft is coaxially arranged inside the hollow outer shaft and is rotatably connected to the tank body. The hollow outer shaft and the inner shaft rotate in opposite directions under the drive of the drive assembly. The upper stirring paddle is fixedly installed on the hollow outer shaft; The lower stirring paddle is rotatably mounted on the inner shaft; A mixing and lifting assembly is mounted on an inner shaft. The mixing and lifting assembly includes a spiral blade, a rotating disk, and several adaptive adjustable nozzle structures. The feeding assembly is fixedly installed on the top of the tank and is used to spray the decolorizing agent into the tank. The drive component drives the hollow outer shaft to rotate in opposite directions to the inner shaft. The upper and lower stirring paddles form vortex flows in opposite directions. The two vortices collide and shear each other at high speed inside the tank. The mixing and lifting component continuously forces the material at the bottom of the tank upward to the rotating disk. The material inside the tank is sprayed outward through the adaptive adjustable nozzle structure. The sprayed material mixes with the decolorizing agent sprayed by the feeding component and falls back into the tank, thus forming a continuous closed-loop decolorizing flow field.

[0006] Preferably, the lifting component further includes: Several suction holes are formed at the bottom of the hollow outer shaft. The number of suction holes is several, and the several suction holes are evenly distributed along the circumference of the hollow outer shaft. A plurality of axial nozzles and a plurality of radial nozzles are evenly distributed on the rotating disk; The spiral blade is fixed on the inner shaft and placed in the internal cavity of the hollow outer shaft. The pitch of the spiral blade gradually increases from top to bottom. The rotating disk is fixedly installed at the top of the hollow outer shaft and connected to the hollow outer shaft. The adaptive adjustable nozzle structure is set between the axial nozzle and the radial nozzle on the same side. When the inner shaft rotates, the spiral blades draw the liquid from the bottom of the tank into the hollow outer shaft cavity through the suction hole and push it upward to the rotating disk. Under the action of centrifugal force, the rotating disk sprays the liquid out from the axial and radial nozzles. The adaptive adjustable nozzle structure synchronously adjusts the opening of the axial and radial nozzles according to the change of rotation speed.

[0007] Preferably, the adaptive adjustable nozzle structure includes: The chute is arranged radially along the rotating disk; A slider is slidably installed in a groove. The slider has a movable hole corresponding to the axial spray hole. When the slider slides, it changes the overlap area between the movable hole and the axial spray hole to form a variable cross-section flow channel. The baffle is slidably installed at the radial nozzle and fixedly connected to the slider via a connecting rod. As the slider moves, the baffle changes the blocking area of ​​the radial nozzle, forming a variable cross-section flow channel. A spring, installed inside the slider, provides a centripetal restoring force to push the slider back when the centrifugal force decreases; When the equipment speed increases and the centrifugal force increases, the slider slides outward along the slide groove, which reduces the flow area of ​​the axial spray holes on the one hand, and drives the baffle to move and reduce the opening of the radial spray holes on the other hand through the connecting rod. When the equipment speed decreases and the centrifugal force decreases, the spring pushes the slider back to the center of rotation, which simultaneously increases the flow area of ​​the axial and radial spray holes to adapt to changes in material viscosity.

[0008] Preferably, a filter screen is fixedly installed at the liquid suction hole, and a scraper is fixedly installed on the inner shaft to drive the scraper to remove the adhering substances on the surface of the filter screen when the inner shaft rotates.

[0009] Preferably, a gear is fixedly installed on the shaft of the lower stirring paddle, and a lever for turning the gear is fixedly installed on the hollow outer shaft, so that when the lever rotates, it drives the lower stirring paddle to rotate through the gear. When the hollow outer shaft rotates, the bottom end of the lever periodically moves the gear, causing the lower stirring paddle to rotate intermittently, thereby eliminating the low-speed stagnation zone at the bottom of the tank and peeling off the adhesive attached to the blade surface.

[0010] Preferably, the tank is further provided with a guide tube, which is located on the inner wall of the tank between the upper and lower agitators. From top to bottom, the guide tube consists of an upper expansion section, a middle contraction section, and a lower expansion section. This allows the downward vortex generated by the upper agitator and the upward vortex generated by the lower agitator to accelerate and collide in the middle contraction section of the guide tube, producing a strong micro-mixing effect.

[0011] Preferably, the inner wall of the middle contraction section of the guide tube is provided with guide ribs to further increase the turbulence intensity during vortex collision.

[0012] Preferably, the upper stirring blade is a narrow, straight blade that is inclined downwards, and the lower stirring blade is a wide, curved blade that is inclined upwards. The bottom end of the upper stirring blade and the top end of the lower stirring blade both extend slightly into the upper and lower expansion sections of the guide tube, and a safety gap is reserved between them and the guide tube.

[0013] Preferably, the feeding assembly includes an annular spray pipe fixedly installed on the top of the tank. The tank is provided with a feeding pipe connected to the annular spray pipe. The decolorizing agent is fed into the annular spray pipe through the feeding pipe and sprayed evenly into the tank in a circumferential manner through the annular spray pipe, so as to come into full contact with the rising and sprayed material and improve the mixing uniformity.

[0014] Preferably, the bottom of the tank is provided with a discharge port, and the top or side of the tank is also provided with a pressure relief valve.

[0015] (III) Beneficial Effects Compared with the prior art, the present invention provides a decolorization production equipment for epoxidized soybean oil plasticizer, which has the following beneficial effects: 1. This decolorizing production equipment for epoxidized soybean oil plasticizer utilizes a hollow outer shaft that rotates in opposite directions to the inner shaft. The liquid inside the tank moves downwards under the action of the upper agitator and upwards under the action of the lower agitator, forming a high-speed collision vortex in the converging section of the guide tube. This significantly improves the uniformity of liquid mixing within the tank. Simultaneously, spiral blades draw liquid from the bottom of the tank through suction holes and transport it to a rotating disk, from which it is sprayed out in thin film or droplet form from axial and radial nozzles on the rotating disk. The annular nozzles then evenly spray the decolorizing agent circumferentially around the tank, creating a three-dimensional cross-contact with the atomized oil sprayed upwards from the rotating disk. This process, combined with the upward transport by the lower agitator and the action of the spiral blades, ensures efficient mixing of the liquid. Forced liquid suction continuously draws high-viscosity materials deposited at the bottom of the tank into the main circulation, completely eliminating the dead zone at the bottom. The rotating disc centrifugal jet atomizes and sprays the oil, which, along with the circumferential spray from the annular nozzle, causes the decolorizing agent to meet the oil in the form of a curtain of fine droplets from top to bottom and from the periphery to the center. The two achieve multi-dimensional and multi-layered uniform mixing in the collision zone of the guide tube and throughout the entire tank space. This eliminates the problems of excessively high or low local concentrations of the decolorizing agent and uneven contact between the oil and the decolorizing agent in traditional equipment. It ensures that the material at the top, middle, and bottom of the tank can fully contact the decolorizing agent, significantly increasing the specific surface area of ​​the liquid, thereby significantly improving decolorization efficiency and the uniformity of product color.

[0016] 2. This decolorization production equipment for epoxidized soybean oil plasticizers utilizes an adaptive adjustable nozzle structure. When the material viscosity is low, leading to increased rotational speed and good flowability, the centrifugal force increases, causing the slider to overcome the spring force and slide outward along the chute. This reduces the overlap area between the moving orifice and the axial nozzle, thus decreasing the axial nozzle opening. Simultaneously, the connecting rod moves the baffle outward, increasing the area obstructing the radial nozzle, further reducing the radial nozzle opening. This reduces both the axial and radial spray flow rates, resulting in finer and more uniform droplets. Conversely, when the material viscosity increases, leading to a decrease in rotational speed... When the centrifugal force decreases, the spring pushes the slider back to the center of rotation, simultaneously increasing the flow area of ​​the axial and radial nozzles, reducing spray resistance, preventing blockage, and ensuring sufficient circulation flow. This allows the spray parameters to be automatically adjusted according to changes in material viscosity, greatly improving the equipment's adaptability to different batches of raw materials. It achieves adaptive matching between nozzle opening and material viscosity, thus preventing nozzle blockage at high viscosity and ensuring atomization effect at low viscosity. It can be adapted to the decolorization production of soybean oil of different batches and grades, while significantly improving the equipment's reliability and ease of maintenance.

[0017] 3. This decolorization production equipment for epoxidized soybean oil plasticizers uses a lever fixedly installed on a hollow outer shaft and a scraper fixedly installed on an inner shaft. The lever engages with a gear on the shaft of the lower agitator, while the scraper corresponds to the filter screen at the suction hole. When the lever rotates with the hollow outer shaft, its bottom end periodically moves the gear, causing the lower agitator to rotate intermittently. This eliminates the low-speed stagnation zone at the bottom of the tank and peels off the adhesive adhering to the blade surface. Simultaneously, the scraper continuously scrapes away impurities adhering to the filter screen as the inner shaft rotates, achieving online self-cleaning of the filter screen and preventing suction blockage. The rotation of the lower agitator enhances the entrainment of material at the bottom of the tank, making it easier for the impurities cleaned by the scraper to be carried away by the circulating flow field. The unobstructed filter screen ensures that the spiral blades can continuously suck in sufficient material, providing a stable flow field for the rotation of the lower agitator. One lever drives the rotation, and the scraper cleans independently. The simple structure and non-interference between the two ensure smooth liquid suction and full entrainment of materials at the bottom of the tank, greatly extending the continuous operation cycle of the equipment.

[0018] 4. This decolorization production equipment for epoxidized soybean oil plasticizers employs differentiated shapes and angles for the upper and lower agitators, with their ends extending slightly into the upper and lower ports of the guide tube. Combined with the three-section structure of the guide tube and the guide ribs on the inner wall of the central contraction section, it generates a concentrated downward axial flow through the narrow, straight design of the upper agitator and a composite flow field of upward axial flow and radial sweeping through the wide, arc-shaped design of the lower agitator. When the two agitators collide at accelerated speed in the central contraction section of the guide tube, the guide ribs further increase the turbulence intensity, significantly enhancing the collision mixing effect. Simultaneously, the differentiated design of the upper and lower agitators creates complementary flow field morphologies and velocities for the two vortices, adapting to conditions of dynamically changing material viscosity and further amplifying the shear mixing effect. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0020] Figure 2 This is a schematic diagram of the cross-sectional structure of the tank body of the present invention.

[0021] Figure 3 This is a schematic diagram of the upper stirring paddle structure of the present invention.

[0022] Figure 4 This is a schematic diagram of the filter structure of the present invention.

[0023] Figure 5 This is a schematic diagram of the spiral blade structure of the present invention.

[0024] Figure 6 For the present invention Figure 5 Enlarged schematic diagram of the structure at point A in the middle.

[0025] Figure 7This is a schematic diagram of the rotating disk structure of the present invention.

[0026] Figure 8 This is a schematic diagram of the adaptive adjustable nozzle structure of the present invention.

[0027] Figure 9 This is a schematic diagram of the groove structure of the present invention.

[0028] Figure 10 This is a schematic diagram of the guide tube structure of the present invention.

[0029] In the diagram: 1. Tank body; 2. Observation window; 3. Drive assembly; 4. Feed port; 5. Hollow outer shaft; 6. Inner shaft; 7. Upper agitator; 8. Lower agitator; 9. Mixing and lifting assembly; 91. Spiral blade; 92. Rotary disk; 93. Adaptive adjustable nozzle structure; 931. Slide groove; 932. Slider; 933. Baffle; 934. Connecting rod; 935. Spring; 936. Moving hole; 94. Liquid suction hole; 95. Axial spray hole; 96. Radial spray hole; 97. Filter screen; 98. Toggle lever; 99. Scraper; 910. Gear; 10. Feeding assembly; 101. Annular nozzle; 102. Feeding pipe; 11. Guide tube; 111. Upper expansion section; 112. Contraction section; 113. Lower expansion section; 114. Guide rib. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] In the description of this invention, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0032] In addition, a fixed connection refers to a connection in which parts or components are fixed and there is no relative movement; a transmission connection refers to a connection in which mechanical motion or torque is transmitted to other working parts through a transmission component; a sliding connection refers to a connection in which two objects are in contact but not fixed and can slide relative to each other; and a rotational connection refers to a connection in which two objects are in contact but not fixed and can rotate relative to each other.

[0033] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0034] Example 1: This embodiment provides a decolorization production equipment for epoxidized soybean oil plasticizers, which has the following technical features.

[0035] Please see Figures 1 to 10 A decolorization production device for epoxidized soybean oil plasticizer includes a tank 1 and a feeding port 4 disposed on the tank 1. The tank 1 is equipped with a drive assembly 3 and an observation window 2. The device also includes: Hollow outer shaft 5 is rotatably mounted on tank body 1; The inner shaft 6 is coaxially arranged inside the hollow outer shaft 5 and rotatably connected to the tank body 1. The hollow outer shaft 5 and the inner shaft 6 rotate in opposite directions under the drive of the drive assembly 3. The upper stirring paddle 7 is fixedly installed on the hollow outer shaft 5; The lower stirring paddle 8 is rotatably mounted on the inner shaft 6; The mixing and lifting component 9 is mounted on the inner shaft 6. The mixing and lifting component 9 includes a spiral blade 91, a rotating disk 92, and several adaptive adjustable spray hole structures 93. The feeding assembly 10 is fixedly installed on the top of the tank 1 and is used to spray the decolorizing agent into the tank 1; The drive assembly 3 can be composed of a drive motor and a planetary gear differential. The output shaft of the drive motor is connected to the input end of the planetary gear differential. The two output ends of the planetary gear differential are fixedly connected to the hollow outer shaft 5 and the inner shaft 6, respectively, so that the hollow outer shaft 5 and the inner shaft 6 can rotate synchronously in opposite directions under the drive of the same drive motor. Alternatively, bevel gears can be fixedly installed on both the hollow outer shaft 5 and the inner shaft 6, and the two bevel gears are symmetrically distributed. A transmission gear is rotatably installed on the tank body, and both bevel gears mesh with the transmission gear, so that when the drive motor drives the inner shaft 6, it also drives the hollow outer shaft 5 to rotate in opposite directions under the transmission of the bevel gears and the transmission gear (this is the prior art and will not be described in detail here).

[0036] By adopting the above technical solution, the decolorizing agent (hydrogen peroxide aqueous solution) is uniformly sprayed around the tank 1 via the feeding component 10. The driving component 3 drives the hollow outer shaft 5 to rotate in opposite directions to the inner shaft 6. The upper stirring paddle 7 and the lower stirring paddle 8 form vortex flows in opposite directions. The two vortices collide and shear each other at high speed inside the tank 1. The two vortices in opposite directions meet in the middle of the tank 1, producing a violent head-on collision. During the collision, the two liquid flows shear and tear each other, dispersing the decolorizing agent and epoxidized soybean oil into tiny droplet groups, greatly increasing the contact area between the two phases. At the same time, the spiral blades 91 in the mixing and lifting component 9 rotate with the inner shaft 6, forcibly conveying the liquid at the bottom of the tank upward to the rotating disk 92. The centrifugal force generated by the high-speed rotation of the rotating disk 92 The liquid is radially sprayed from the nozzle in the form of a thin film or droplets. These sprayed droplets are then mixed three-dimensionally with the decolorizing agent sprayed from the feeding component 10, and then fall back into the tank, completing a complete cycle. This creates a three-dimensional circulating flow field in the tank, characterized by "bottom suction - upward lifting - top spraying - circular fall," completely eliminating the mixing dead zones at the bottom and top of the tank in traditional equipment. At the same time, the centrifugal spraying of the rotating disk 92 significantly increases the specific surface area of ​​the liquid, thereby significantly improving the contact probability and reaction efficiency between the decolorizing agent and epoxidized soybean oil. This completely eliminates the sedimentation zone at the bottom and the stagnant zone at the top of the tank, which are common in traditional equipment. This allows the decolorizing agent and soybean oil to achieve uniform and sufficient contact throughout the entire tank, thereby greatly improving the decolorization reaction rate and the uniformity of the product color.

[0037] Specifically, the mixing enhancement component 9 also includes: Several suction holes 94 are provided at the bottom of the hollow outer shaft 5. The number of suction holes 94 is several, and the suction holes 94 are evenly distributed around the circumference of the hollow outer shaft 5. A number of axial nozzles 95 and a number of radial nozzles 96 are evenly distributed on the rotating disk 92. The spiral blade 91 is fixed on the inner shaft 6 and placed in the internal cavity of the hollow outer shaft 5. The pitch of the spiral blade 91 gradually increases from top to bottom. The rotating disk 92 is fixedly installed on the top of the hollow outer shaft 5 and connected to the hollow outer shaft 5. The adaptive adjustable nozzle structure 93 is set between the axial nozzle 95 and the radial nozzle 96 on the same side. By adopting the above technical solution, the spiral blades 91 rotate with the inner shaft 6, drawing the liquid from the bottom of the tank into the inner cavity of the hollow outer shaft 5 through the suction hole 94 and pushing it upwards to the rotating disk 92. The rotating disk 92 rotates at high speed, and the liquid is ejected from the axial spray hole 95 and the radial spray hole 96 under the action of centrifugal force. The spiral blades 91, with the pitch gradually increasing from top to bottom, generate a stronger suction force at the bottom, ensuring that the high-viscosity material at the bottom of the tank is effectively sucked in, solving the problem of insufficient material entrainment at the bottom of traditional equipment. The combined spraying of the axial spray hole 95 and the radial spray hole 96 results in the liquid having both vertically upward atomized components and radially diffused film components, expanding the spray coverage area and forming a more thorough collision and mixing with the decolorizing agent sprayed by the feeding mechanism. This multi-directional and multi-layer spraying method increases the probability of contact between the decolorizing agent and the oil body many times over. At the same time, due to the forced pushing of the spiral blades 91, the material at the bottom of the tank is continuously sucked away, preventing the high-viscosity material from depositing and thickening at the bottom, and ensuring the fluidity of the entire tank 1.

[0038] Specifically, the adaptive adjustable nozzle structure 93 includes: The slide 931 is arranged radially along the rotating disk 92; The slider 932 is slidably installed in the groove 931. The slider 932 has a moving hole 936 corresponding to the axial spray hole 95. When the slider 932 slides, the overlapping area between the moving hole 936 and the axial spray hole 95 is changed to form a variable cross-section flow channel. Baffle 933 is slidably installed at radial nozzle 96 and fixedly connected to slider 932 via connecting rod 934. As slider 932 moves, the blocking area of ​​baffle 933 and radial nozzle 96 changes, forming a variable cross-section flow channel. Spring 935, installed inside slider 932, provides centripetal restoring force to push slider 932 back when centrifugal force decreases; By adopting the above technical solution, when the material viscosity is low, resulting in increased rotation speed and good flowability, the centrifugal force increases. The slider 932 overcomes the force of the spring 935 and slides outward along the slide groove 931. On the one hand, the overlap area between the moving hole 936 and the axial spray hole 95 decreases, and the opening of the axial spray hole 95 decreases. On the other hand, the connecting rod 934 drives the baffle 933 to move outward, increasing the blocking area of ​​the radial spray hole 96, and the opening of the radial spray hole 96 decreases. Thus, the axial and radial spray flow rates are reduced simultaneously, making the droplets finer and more uniform. When the material viscosity increases, resulting in decreased rotation speed, the centrifugal force decreases, and the spring 935 pushes the slider 932 back to the center of rotation, simultaneously increasing the flow area of ​​the axial spray hole 95 and the radial spray hole 96, reducing spray resistance, preventing blockage, and ensuring sufficient circulation flow. Thus, the spray parameters can be automatically adjusted according to changes in material viscosity, greatly improving the equipment's adaptability to different batches of raw materials.

[0039] Specifically, a filter screen 97 is fixedly installed at the suction hole 94, and a scraper 99 is fixedly installed on the inner shaft 6, which is used to drive the scraper 99 to scrape off the adhering substances on the surface of the filter screen 97 when the inner shaft 6 rotates.

[0040] By adopting the above technical solution, when the inner shaft 6 rotates, it drives the scraper 99 to continuously scrape off the adhesive or particulate impurities attached to the surface of the filter screen 97, preventing the suction holes 94 from becoming clogged and ensuring smooth suction. This structure utilizes the rotational power of the inner shaft 6 itself, eliminating the need for additional drive, and achieving online self-cleaning of the filter screen 97, thus avoiding a decrease in suction volume or even interruption of flow due to clogging of the filter screen 97.

[0041] Specifically, a gear 910 is fixedly installed on the shaft of the lower stirring paddle 8, and a lever 98 for turning the gear 910 is fixedly installed on the hollow outer shaft 5, so that when the lever 98 rotates, it turns the gear 910 to drive the lower stirring paddle 8 to rotate. By adopting the above technical solution, when the hollow outer shaft 5 rotates, the bottom end of the lever 98 (which can be designed as a cam or a toothed lever) periodically moves the gear 910, causing the lower stirring paddle 8 to rotate intermittently. The rotation causes the blades of the lower stirring paddle 8 to rotate on the basis of the revolution, which generates a stronger shearing and entrainment effect on the liquid in the bottom area of ​​the tank, completely breaking up the low-speed stagnation zone that may have existed, and making the material at the bottom of the tank fully entrained into the mainstream circulation. On the other hand, the rotation causes the adhesive attached to the surface of the blades of the lower stirring paddle 8 to be continuously peeled off, realizing the self-cleaning of the blades and preventing the blades from failing due to long-term accumulation of adhesive.

[0042] Specifically, a guide tube 11 is also provided inside the tank body 1. The guide tube 11 is located on the inner wall of the tank body 1 between the upper stirring blade 7 and the lower stirring blade 8. From top to bottom, it consists of an upper expansion section 111, a middle contraction section 112, and a lower expansion section 113. This allows the downward vortex generated by the upper stirring blade 7 and the upward vortex generated by the lower stirring blade 8 to accelerate and collide in the middle contraction section 112 of the guide tube 11, producing a strong micro-mixing effect.

[0043] By adopting the above technical solution, the three-section structure of the guide tube 11 accelerates and guides the fluid: the upper expansion section 111 collects the downward vortex generated by the upper agitator 7, and the lower expansion section 113 collects the upward vortex generated by the lower agitator 8. The two fluids increase their velocity in the middle contraction section 112 due to the sharp reduction in cross-section. When they collide head-on, they generate extremely high shear stress and turbulence intensity, tearing the decolorizing agent and oil into tiny droplets, improving the uniformity of mixing. The structure of the guide tube 11 concentrates the collision that was originally dispersed in the tank into a small area, greatly improving the collision intensity and significantly enhancing the decolorization effect, making the decolorization reaction faster and more uniform.

[0044] Specifically, the inner wall of the middle contraction section 112 of the guide tube 11 is provided with guide ribs 114 to further increase the turbulence intensity during vortex collision.

[0045] Specifically, the upper impeller 7 is a narrow, straight blade that is tilted downwards, while the lower impeller 8 is a wide, curved blade that is tilted upwards. The bottom of the upper impeller 7 and the top of the lower impeller 8 extend slightly into the upper expansion section 111 and the lower expansion section 113 of the guide tube 11, respectively, and a safety gap is reserved between them and the guide tube 11.

[0046] By adopting the above technical solution, the upper agitator 7 uses narrow, straight blades, mainly generating downward axial flow. Its downward tilt angle makes the direction of the pumped liquid more concentrated, which is beneficial for effectively pressing the surface liquid into the upper expansion section 111 of the guide tube 11. The lower agitator 8 uses wide, arc-shaped blades. On the one hand, its larger width allows it to sweep a larger area of ​​the tank bottom. On the other hand, the arc-shaped blade surface generates both upward axial flow and a certain radial flow when rotating, which helps to push the material at the bottom corners of the tank towards the center. Then, the upward tilt angle pushes the material into the lower expansion section 113 of the guide tube 11. Both blades extend slightly into the upper and lower expansion sections of the guide tube 11, ensuring that most of the stirred fluid is forcibly guided into the guide tube 11 to participate in the collision. The reserved safety gap prevents mechanical collisions caused by vibration or thermal expansion during operation, improving the safety and reliability of the equipment.

[0047] Specifically, as shown in the figure, the feeding component 10 includes an annular spray pipe 101 fixedly installed on the top of the tank body 1. The tank body 1 is provided with a feeding pipe 102 connected to the annular spray pipe 101. The decolorizing agent is fed into the annular spray pipe 101 through the feeding pipe 102 and sprayed evenly into the tank body 1 in a circumferential manner through the annular spray pipe 101, so as to come into full contact with the rising and sprayed material and improve the mixing uniformity.

[0048] By adopting the above technical solution, the decolorizing agent is fed into the annular nozzle 101 via an external metering pump and feeding pipe 102. The annular nozzle 101 is arranged along the circumference of the top of the tank 1, and multiple downward or oblique small holes are opened on the pipe wall. The decolorizing agent is evenly sprayed out from the small holes, forming a fine droplet curtain. These decolorizing agent droplets fall from above and form a three-dimensional cross contact with the oil droplets sprayed upward from the rotating disk 92. This circumferentially uniform spraying method avoids the local concentration being too high or too low caused by traditional single-pipe feeding, allowing the decolorizing agent to mix with a large amount of oil in the first instance, which is conducive to uniform reaction.

[0049] Specifically, a discharge port is provided at the bottom of tank 1, and a pressure relief valve is also provided at the top or side of tank 1.

[0050] Working principle: During operation, the drive assembly 3 drives the hollow outer shaft 5 to rotate counterclockwise and the inner shaft 6 to rotate clockwise. The upper stirring paddle 7 generates a downward-pressing vortex, and the lower stirring paddle 8 generates an upward-pushing vortex. The two vortices collide at high speed in the contraction section 112 in the middle of the guide tube 11, achieving preliminary micro-mixing of the materials. At the same time, the spiral blades 91 rotate with the inner shaft 6, drawing the liquid from the bottom of the tank into the inner cavity of the hollow outer shaft 5 through the suction hole 94 and pushing it upward to the rotating disk 92. The rotating disk 92 rotates at high speed, and the liquid is sprayed out through the axial spray hole 95 and the radial spray hole 96 under the action of centrifugal force, forming a thin film or droplets. An external metering pump sends the decolorizing agent into the annular spray pipe 101 through the feeding pipe 102. The decolorizing agent is evenly sprayed out from the small holes, forming a fine droplet curtain. These decolorizing agent droplets fall from above, forming a three-dimensional cross contact with the oil droplets sprayed upwards from the rotating disk 92. This allows the decolorizing agent to mix with a large amount of oil immediately, promoting a uniform reaction. During decolorization, when the material viscosity is low, causing the rotation speed to increase, the centrifugal force increases. The slider 932 overcomes the force of the spring 935 and slides outwards along the slide groove 931. On the one hand, the overlap area between the moving hole 936 and the axial spray hole 95 decreases, and the opening of the axial spray hole 95 decreases. On the other hand, the connecting rod 934 drives the baffle 933 to move outwards, increasing the blocking area of ​​the radial spray hole 96, and reducing the opening of the radial spray hole 96. This simultaneously reduces the axial and radial spray flow rates, making the droplets more uniform. When the material viscosity increases, causing the rotation speed to decrease, the centrifugal force decreases. The spring 935 pushes the slider 932 back to the center of rotation, simultaneously increasing the flow area of ​​the axial spray hole 95 and the radial spray hole 96, reducing spray resistance, preventing blockage, and ensuring sufficient circulation flow.

[0051] When the inner shaft 6 rotates, the scraper 99 rotates with it, continuously scraping away the adhesive or particulate impurities adhering to the surface of the filter screen 97 to prevent blockage of the suction hole 94 and ensure smooth liquid suction. Simultaneously, when the hollow outer shaft 5 rotates, the bottom end of the lever 98 periodically moves the gear 910, causing the lower stirring paddle 8 to rotate intermittently. This rotation adds its own rotation to the revolution of the paddles, resulting in stronger shearing and entrainment of the liquid at the bottom of the tank, completely breaking up any potential low-speed stagnation zones and ensuring that the material at the bottom of the tank is fully entrained in the main circulation. Furthermore, the rotation continuously peels away the adhesive adhering to the surface of the blades of the lower stirring paddle 8, achieving self-cleaning of the blades and preventing long-term accumulation of adhesive that could lead to blade failure. After decolorization, the finished product is discharged through the discharge port.

[0052] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0053] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A decolorization production device for epoxidized soybean oil plasticizer, comprising a tank (1) and a feeding port (4) disposed on the tank (1), wherein a drive assembly (3) is disposed on the tank (1), and an observation window (2) is also disposed on the tank (1), characterized in that, Also includes: A hollow outer shaft (5) is rotatably mounted on the tank body (1); The inner shaft (6) is coaxially arranged inside the hollow outer shaft (5) and rotatably connected to the tank body (1). The hollow outer shaft (5) and the inner shaft (6) rotate in opposite directions under the drive of the drive assembly (3). The upper stirring paddle (7) is fixedly installed on the hollow outer shaft (5); The lower stirring paddle (8) is rotatably mounted on the inner shaft (6); The mixing and lifting assembly (9) is mounted on the inner shaft (6). The mixing and lifting assembly (9) includes a spiral blade (91), a rotating disk (92), and several adaptive adjustable nozzle structures (93). The feeding assembly (10) is fixedly installed on the top of the tank (1) and is used to spray the decolorizing agent into the tank (1); Among them, the driving component (3) drives the hollow outer shaft (5) to rotate in opposite directions to the inner shaft (6). The upper stirring paddle (7) and the lower stirring paddle (8) form vortex flows in opposite directions. The two vortices collide and shear and mix at high speed inside the tank (1). The mixing and lifting component (9) continuously forces the material at the bottom of the tank to the rotating disk (92). The material inside the tank is sprayed outward through the adaptive adjustable nozzle structure (93). After being sprayed, the material mixes with the decolorizing agent sprayed by the feeding component (10) and falls back into the tank (1), thus forming a continuous closed-loop decolorizing flow field.

2. The decolorization production equipment for epoxidized soybean oil plasticizer according to claim 1, characterized in that, The mixing and enhancing component (9) further includes: A plurality of suction holes (94) are provided at the bottom of the hollow outer shaft (5). The number of suction holes (94) is a plurality, and the plurality of suction holes (94) are evenly distributed along the circumference of the hollow outer shaft (5). A plurality of axial nozzles (95) and a plurality of radial nozzles (96) are evenly distributed on a rotating disk (92). The spiral blade (91) is fixed on the inner shaft (6) and placed in the internal cavity of the hollow outer shaft (5). The pitch of the spiral blade (91) gradually increases from top to bottom. The rotating disk (92) is fixedly installed on the top of the hollow outer shaft (5) and connected to the hollow outer shaft (5). The adaptive adjustable nozzle structure (93) is set between the axial nozzle (95) and the radial nozzle (96) on the same side. When the inner shaft (6) rotates, the spiral blades (91) draw the liquid from the bottom of the tank into the inner cavity of the hollow outer shaft (5) through the suction hole (94) and push it upward to the rotating disk (92). Under the action of centrifugal force, the rotating disk (92) sprays the liquid out from the axial nozzle (95) and the radial nozzle (96). The adaptive adjustable nozzle structure (93) adjusts the opening of the axial nozzle (95) and the radial nozzle (96) synchronously according to the change of rotation speed.

3. The decolorization production equipment for epoxidized soybean oil plasticizer according to claim 2, characterized in that, The adaptive adjustable nozzle structure (93) includes: A chute (931) is arranged radially along the rotating disk (92); The slider (932) is slidably installed in the groove (931). The slider (932) has a moving hole (936) corresponding to the axial spray hole (95). When the slider (932) slides, it changes the overlapping area of ​​the moving hole (936) and the axial spray hole (95) to form a variable cross-section flow channel. The baffle (933) is slidably installed at the radial nozzle (96) and fixedly connected to the slider (932) by the connecting rod (934). As the slider (932) moves, the baffle (933) and the radial nozzle (96) block the area of ​​the baffle (933) and the radial nozzle (96) change to form a variable cross-section flow channel. A spring (935), installed inside the slider (932), provides a centripetal restoring force to push the slider (932) back when the centrifugal force decreases; When the equipment speed increases and the centrifugal force increases, the slider (932) slides outward along the slide groove (931), which reduces the flow area of ​​the axial nozzle (95) on the one hand, and drives the baffle (933) to move and reduce the opening of the radial nozzle (96) through the connecting rod (934); when the equipment speed decreases and the centrifugal force decreases, the spring (935) pushes the slider (932) back to the center of rotation, which simultaneously increases the flow area of ​​the axial and radial nozzles to adapt to changes in material viscosity.

4. The decolorization production equipment for epoxidized soybean oil plasticizer according to claim 3, characterized in that, A filter screen (97) is fixedly installed at the liquid suction hole (94), and a scraper (99) is fixedly installed on the inner shaft (6) to drive the scraper (99) to scrape off the adhering substances on the surface of the filter screen (97) when the inner shaft (6) rotates.

5. The decolorization production equipment for epoxidized soybean oil plasticizer according to claim 4, characterized in that, A gear (910) is fixedly installed on the shaft of the lower stirring paddle (8), and a lever (98) for turning the gear (910) is fixedly installed on the hollow outer shaft (5), so that when the lever (98) rotates, it drives the lower stirring paddle (8) to rotate by turning the gear (910). When the hollow outer shaft (5) rotates, the bottom end of the lever (98) periodically moves the gear (910), causing the lower stirring paddle (8) to rotate intermittently, thereby eliminating the low-speed stagnation zone at the bottom of the tank and peeling off the adhesive attached to the blade surface.

6. The decolorization production equipment for epoxidized soybean oil plasticizer according to claim 1, characterized in that, The tank (1) is also provided with a guide tube (11). The guide tube (11) is located on the inner wall of the tank (1) between the upper stirring blade (7) and the lower stirring blade (8). From top to bottom, it consists of an upper expansion section (111), a middle contraction section (112), and a lower expansion section (113). This allows the downward vortex generated by the upper stirring blade (7) and the upward vortex generated by the lower stirring blade (8) to accelerate and collide in the middle contraction section (112) of the guide tube (11), producing a strong micro-mixing effect.

7. The decolorization production equipment for epoxidized soybean oil plasticizer according to claim 6, characterized in that, The inner wall of the middle contraction section (112) of the guide tube (11) is provided with guide ribs (114) to further increase the turbulence intensity during vortex collision.

8. The decolorization production equipment for epoxidized soybean oil plasticizer according to claim 2, characterized in that, The upper stirring blade (7) is a narrow, straight blade that is tilted downwards, and the lower stirring blade (8) is a wide, curved blade that is tilted upwards. The bottom of the upper stirring blade (7) and the top of the lower stirring blade (8) extend slightly into the upper expansion section (111) and the lower expansion section (113) of the guide tube (11), and a safety gap is reserved between them and the guide tube (11).

9. The decolorization production equipment for epoxidized soybean oil plasticizer according to claim 1, characterized in that, The feeding assembly (10) includes an annular nozzle (101) fixedly installed on the top of the tank (1). The tank (1) is provided with a feeding pipe (102) connected to the annular nozzle (101). The decolorizing agent is fed into the annular nozzle (101) through the feeding pipe (102) and sprayed evenly into the tank (1) in the circumference through the annular nozzle (101), so as to come into full contact with the rising and sprayed material and improve the mixing uniformity.

10. The decolorization production equipment for epoxidized soybean oil plasticizer according to claim 1, characterized in that, The bottom of the tank (1) is provided with a discharge port, and the top or side of the tank (1) is also provided with a pressure relief valve.

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