Method and system for preparing a vitamin carrier with silicon dioxide

Abstract

The application discloses a kind of silica preparation method and preparation system for vitamin carrier, it is related to the technical field of silicon dioxide, including drying tower and installation on atomizing nozzle of drying tower, still including lifting air guide mechanism, it is installed in drying tower inside, and driving piece for driving lifting air guide mechanism rotation is installed at drying tower bottom, drying tower bottom is funnel-shaped and is equipped with the annular protrusion of several distributed along discharge direction, the lifting air guide mechanism outer sleeve is connected with the stirring mechanism of coaxial rotation, the stirring mechanism is clearance fit with annular protrusion, stirring mechanism is installed in vibration component with lifting push flow mechanism abutment cooperation, when hot air enters drying tower, driving piece drives lifting push flow mechanism and pushes hot air upwards.The application is vertically lifted in tower by driving piece control air guide mechanism, and hot air entering drying tower is forced to push upwards from bottom, directional vortex is formed, and temperature gradient is eliminated.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of silicon dioxide, in particular to a preparation method and a preparation system of silicon dioxide for vitamin carriers. BACKGROUND

[0002] Silicon dioxide is widely used in the fields of medicine, food and feed as a functional carrier material due to its chemical inertness, high specific surface area, controllable pore structure and good biocompatibility. In the preparation of vitamin preparations, silicon dioxide is often used as an adsorbent or a sustained-release carrier. In the preparation process, a spray drying tower is needed to dry and granulate the slurry. Spray drying is a drying process in which the raw material liquid is separated into mist droplets in a atomizer, and a powder particle shape product is obtained by directly contacting hot air or other gas with the mist droplets.

[0003] The existing patent application with the patent publication number CN215312166U and the publication date of December 28, 2021 is entitled "A spray granulator". The patent comprises a shell, an atomizer, a fluidized bed and a blower. The shell side wall is provided with an air outlet, and the shell side wall bottom end is provided with a particle discharge port. The atomizer is arranged on the upper end of the shell and is used for atomizing and spraying the slurry into the shell. The fluidized bed comprises a wind distribution plate and a wind chamber. The wind distribution plate is horizontally arranged at the bottom end of the shell and located below the particle discharge port. The wind chamber is located below the wind distribution plate. The wind distribution plate is provided with a plurality of ventilation pipes which are communicated with the wind chamber. The blower is connected with an air outlet duct. The blower is used for conveying air into the air outlet duct. The air outlet duct is connected with a heater. The heater is connected with the upper end of the shell. The air outlet duct is connected with the wind chamber. The utility model provides a kind of spray granulator. Granular material is discharged from the particle discharge port and can be directly bagged without waiting for cooling. Personnel scalding is effectively prevented, safety is improved, and work efficiency is also improved.

[0004] The existing preparation of vitamin carrier silicon dioxide by precipitation method has the problems of many impurities in raw materials, easy agglomeration of particles leading to poor structure, high residual sodium sulfate as byproduct, high energy consumption and uneven product particle morphology. The above-mentioned application also has deficiencies. The bottom of the drying tower is generally funnel-shaped. Silicon dioxide particles are easy to accumulate in the conical area, forming a bridge and blocking, which leads to poor discharge and frequent shutdown for cleaning. At the same time, the fixed air guide structure cannot dynamically adjust the hot air flow direction, resulting in temperature gradient in the tower. The upper temperature is too high and the lower temperature is insufficient, which not only reduces the drying efficiency, but also causes local overheating or insufficient heating of the material. The static air guide structure also cannot drive the airflow to fully diffuse to the tower wall, so that the atomized liquid droplets condense and accumulate on the tower wall, forming a stubborn wall sticking layer, which reduces the product yield. SUMMARY

[0005] The purpose of the present application is to provide a preparation method and a preparation system of silicon dioxide for vitamin carriers to solve the above-mentioned deficiencies in the prior art.

[0006] To achieve the above object, the present application provides the following technical solutions:

[0007] A preparation method of a vitamin carrier silica, characterized by comprising the following steps:

[0008] S1, a solid sodium silicate with a modulus of 3.0-3.5 is prepared into a sodium silicate solution with a mass concentration of 15-20%, a polyaluminum chloride-chitosan composite flocculant with a mass concentration of 0.5-1.0% is added, stirring is carried out at 80-100 r / min for 60 min, and then standing is carried out for 60 min to obtain a high-purity sodium silicate solution;

[0009] S2, alkylphenol polyoxyethylene ether is added to the obtained solution, and a sulfuric acid solution with a mass concentration of 10-15% is prepared;

[0010] S3, industrial water is added to the reaction kettle to a volume ratio of 1 / 6, the temperature is raised to 30-40℃, the sodium silicate solution of step 2 is added, and stirring is carried out at 60-80 r / min;

[0011] S4, the temperature is raised to 45-55℃, the stirring rate is adjusted to 80-100 r / min, the sodium silicate solution and the sulfuric acid solution are synchronously added dropwise to a volume ratio of 40% in the reaction system, the pH is controlled to be 7.5-8.5, and the reaction is carried out for 60 min, then the sulfuric acid solution is continuously added dropwise until the pH is 4.5-5.5, and then standing is carried out for 30 min;

[0012] S5, after pressure filtration, the filter cake is washed with industrial water, the sodium sulfate content of the finished product is controlled to be less than 2% by controlling the conductivity of the washing water, and the filter cake is adjusted to a solid content of 20-25% and then pulped;

[0013] S5, the thick slurry is sent into a spray dryer for drying, hot air combusted by natural gas is used as a heat source, and granular silica is obtained.

[0014] In the above scheme, by using a composite flocculant to deeply purify raw materials, a dispersant to regulate the reaction process, and precise control of the conductivity to control the washing and spray drying process, the performance of the silica product is significantly improved, metal impurities are effectively removed, high-purity, high-specific-surface-area, and optimized pore structure, low sodium sulfate residue, good particle morphology and flowability are obtained, and at the same time, the energy consumption is significantly reduced due to the combination of spray drying and natural gas heat source, and overall, a high-performance silica carrier suitable for vitamin loading is prepared in a safer, more efficient, stable, and energy-saving manner.

[0015] Preferably, the composite flocculant is composed of polyaluminum chloride and chitosan, and the addition amount is 0.5-1.0% of the total mass of the sodium silicate solution, and the removal of heavy metals and impurities is completed synchronously during stirring.

[0016] The vitamin carrier preparation system used in the preparation method comprises a drying tower and an atomizing nozzle installed on the drying tower, further comprises a lifting air guide mechanism installed in the drying tower, and a driving member for driving the rotation of the lifting air guide mechanism is installed at the bottom of the drying tower, the bottom of the drying tower is funnel-shaped and is provided with a plurality of annular protrusions distributed along the discharge direction, a raking mechanism coaxially rotating with the lifting air guide mechanism is connected to the outer sleeve of the lifting air guide mechanism, the raking mechanism is in clearance fit with the annular protrusions, a vibration assembly in abutting fit with the lifting air guide mechanism is installed in the raking mechanism, when hot air enters the drying tower, the driving member drives the lifting air guide mechanism to push the hot air upward, and drives the raking mechanism to rotate to accelerate the airflow at the bottom of the drying tower and diffuse to the inner wall of the drying tower.

[0017] Preferably, the driving member comprises a driving motor fixed to the bottom of the drying tower, and a connecting shaft sleeve is installed on the output shaft of the driving motor in the drying tower, and the bottom of the lifting air guide mechanism is movably inserted into the connecting shaft sleeve.

[0018] Preferably, the lifting air guide mechanism comprises a shaft rod movably inserted into the connecting shaft sleeve, a wind guide disc is fixedly connected to the top end of the shaft rod, the wind guide disc is located below the atomizing nozzle, an abutting cross rod is fixedly connected to the bottom of the shaft rod, a guide ring for the abutting cross rod to lap is fixedly connected in the drying tower, and a plurality of arc-shaped grooves are annularly distributed on the guide ring.

[0019] Preferably, the raking mechanism comprises a sleeve coaxially sleeved with the shaft rod, a plurality of blades are fixedly connected to the outer wall of the sleeve, and recesses matched with the annular protrusions are formed in the blades.

[0020] Preferably, the vibration assembly comprises a pair of abutting rods elastically inserted into the sleeve, key grooves are vertically formed on both sides of the shaft rod, abutting teeth are arranged in the key grooves, and one end of the abutting rod extends into the key groove and is in abutting fit with the abutting teeth.

[0021] Preferably, the blades are respectively fixedly connected with flow guide covers on both sides, and push air plates symmetrically fixedly connected with the flow guide covers are arranged on the other end of the abutting rods.

[0022] Preferably, the bottom of the drying tower is provided with annularly distributed discharge ports, a discharging disc is fixedly connected to the shaft rod, and the discharging disc is located below the discharge ports.

[0023] Preferably, a ring-shaped trapping net is installed at the top of the inner wall of the drying tower, and a plurality of heat conduction fins are arranged on the top surface of the ring-shaped trapping net.

[0024] In the above technical scheme, the driving member is arranged to control the vertical lifting of the air guide mechanism in the tower, the hot air entering the drying tower is forced to push upward from the bottom, a directional vortex is formed, the temperature gradient is eliminated, the annular protrusion at the bottom is matched with the gap of the rotating raking mechanism, the lifting of the raking mechanism is limited, the vibration assembly embedded in the raking mechanism dynamically abuts against the lifting air guide mechanism, high-frequency micro-vibration waves are generated, the arching structure is broken, and the flow speed of the bottom air flow is also improved when the raking mechanism rotates, so that the bottom air flow is quickly guided to the lifting air guide mechanism to force the hot air to diffuse to the entire tower wall, thereby avoiding the condensation and accumulation of atomized liquid drops on the tower wall, and improving the yield.

[0025] It should be understood that the foregoing general description and the following detailed description are merely exemplary and explanatory, and are not intended to limit the present disclosure.

[0026] The present application provides an overview of various implementations or examples of the technology described in the present disclosure, and is not a comprehensive disclosure of the full scope or all features of the disclosed technology. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments described in the present application, and other drawings can also be obtained by those skilled in the art based on these drawings.

[0028] Figure 1 It is a schematic diagram of the overall structure of the silicon dioxide preparation system for the vitamin carrier of the present application;

[0029] Figure 2 It is a sectional view of the silicon dioxide preparation system for the vitamin carrier of the present application;

[0030] Figure 3 It is an enlarged view of the structure at A in the present application; Figure 2

[0031] Figure 4 It is a schematic diagram of the internal structure of the drying tower in the silicon dioxide preparation system for the vitamin carrier of the present application;

[0032] Figure 5 It is a schematic diagram of the connection between the lifting air guide mechanism and the raking mechanism in the silicon dioxide preparation system for the vitamin carrier of the present application;

[0033] Figure 6 It is a schematic diagram of the connection between the raking mechanism and the vibration assembly in the silicon dioxide preparation system for the vitamin carrier of the present application;

[0034] Figure 7 It is a schematic diagram of the structure of the sleeve and the vibration assembly in the silicon dioxide preparation system for the vitamin carrier of the present application;​

[0035] Figure 8 It is a structure diagram of a vibrating assembly in a vitamin carrier silica preparation system.

[0036] Marked for explanation:

[0037] 1, drying tower; 101, discharge port; 2, atomizing nozzle; 3, lifting air guide mechanism; 31, shaft rod; 32, air guide disc; 33, abutting cross rod; 34, guide ring; 35, arc-shaped groove; 36, key groove; 37, abutting tooth; 4, driving part; 41, driving motor; 42, connecting shaft sleeve; 5, annular protrusion; 6, stirring mechanism; 61, sleeve; 62, blade; 63, groove; 64, flow guide cover; 7, vibrating assembly; 71, abutting rod; 72, air pushing plate; 73, top spring; 8, discharge disc; 9, annular trapping net; 91, heat conduction sheet. DETAILED DESCRIPTION

[0038] To make the purpose, technical scheme and advantages of the embodiments of the present disclosure clearer, the technical scheme of the embodiments of the present disclosure will be described clearly and completely below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, rather than all the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by a person of ordinary skill in the art without any inventive effort fall within the protection scope of the present disclosure.

[0039] Please refer to Figures 1-8 The embodiment of the present application provides a kind of silica preparation method for vitamin carrier, it is characterized in that, including the following steps:

[0040] S1, the solid sodium silicate with modulus of 3.0-3.5 is prepared into sodium silicate solution with mass concentration of 15-20%, 0.5-1.0% of polyaluminum chloride, chitosan composite flocculant with mass concentration is added, stirred at 80-100r / min for 60min, and then stand for 60min, to obtain high-purity sodium silicate solution;

[0041] S2, to the obtained solution, add alkylphenol polyoxyethylene ether additive amount is 0.5% of the theoretical mass of silica, and prepare 10-15% of sulfuric acid solution with mass concentration;

[0042] S3, industrial water is added to the reaction kettle to 1 / 6 of volume ratio, heated to 30-40℃, sodium silicate solution of step 2 is added, and stirred at 60-80r / min;

[0043] S4, temperature is raised to 45-55 DEG C, stirring rate is adjusted to 80-100 r / min, sodium silicate solution and sulfuric acid solution are synchronously added to the reaction system to reach 40% of the volume of the kettle, pH is controlled to 7.5-8.5, reaction is carried out for 60 min, sulfuric acid solution is continuously added until pH is 4.5-5.5, and aging is carried out for 30 min;

[0044] S5, the filter cake is washed by industrial water after pressure filtration, the content of sodium sulfate in the finished product is controlled to be less than 2% by the conductivity of the washing water, and the filter cake is beaten after the solid content is adjusted to 20-25%;

[0045] S5, the thick slurry is sent into a spray dryer for drying, hot air combusted by natural gas is used as a heat source, and granular silicon dioxide is obtained.

[0046] In a further embodiment of the application, the composite flocculant is composed of polyaluminum chloride and chitosan, and the addition amount is 0.5-1.0% of the total mass of the sodium silicate solution.

[0047] The vitamin carrier preparation system comprises a drying tower 1, an atomizing nozzle 2 installed on the drying tower 1, a lifting air guide mechanism 3 installed in the drying tower 1, a driving piece 4 installed at the bottom of the drying tower 1 and used for driving the lifting air guide mechanism 3 to rotate, a plurality of annular protrusions 5 distributed along the discharge direction and arranged at the bottom of the drying tower 1 in a funnel shape, a stirring mechanism 6 coaxially rotating with the lifting air guide mechanism 3, a vibrating assembly 7 installed in the stirring mechanism 6 and abutting against the lifting air guide mechanism 3, and a driving piece 4 installed at the bottom of the drying tower 1 and used for driving the lifting air guide mechanism 3 to rotate.

[0048] Specifically, the tower body of the drying tower 1 is a vertical cylindrical structure, the bottom is designed in a funnel shape, an atomizing nozzle 2 is installed at the center of the top of the tower, used for atomizing the solution into micron-sized droplets and spraying them out in the drying tower 1, a hot air pipeline is arranged on the side of the drying tower 1 and connected with a hot air supply system, when the atomizing nozzle 2 sprays the solution, a driving member 4 is started, on one hand, the driving member 4 drives the lifting air guide mechanism 3 to rotate and move up and down within a certain range, which plays a role of guiding and pushing the hot air upwards, changes the path of the hot air entering the traditional tower, enhances the airflow disturbance, on the other hand, the driving member 4 can drive the raking mechanism 6 to rotate closely to the area of the annular protrusion 5 at the bottom of the tower through the lifting air guide mechanism 3, when the blade 62 rotates, it will agitate the powder accumulated at the bottom of the tower and the airflow, and throw the powder up, at the same time, the driving member 4 drives the airflow at the bottom to rush to the lifting air guide mechanism 3 at the center, and then the airflow is diffused to the tower wall through the blocking of the lifting air guide, forming a hot air flow circulation mode which circulates from the center upwards and then to the outer periphery, the atomized droplets are fully contacted and mixed with the disturbed rising hot air in the descending process, the moisture is quickly evaporated, forming fine and dry silicon dioxide powder particles, the lifting movement enhances the turbulence degree of the fluid, improves the heat and mass transfer efficiency, the rotation of the raking mechanism 6 effectively prevents the accumulation and wall sticking of the wet material and the semi-dry powder at the bottom of the tower, and is especially suitable for materials which are easy to absorb moisture or sticky, and promotes the upwelling of the airflow at the bottom, the vibration assembly 7 generates high-frequency micro-vibration when working, further assisting the powder to separate from the lifting air guide mechanism 3 and the tower wall.

[0049] Compared with the prior art, the embodiment of the present application controls the lifting of the air guide mechanism in the tower through the driving member 4, forcibly pushes the hot air entering the drying tower 1 upwards from the bottom, forms a directional vortex, eliminates the temperature gradient, the annular protrusion 5 at the bottom of the tower cooperates with the rotating raking mechanism 6 in a gap, limits the lifting of the raking mechanism 6, makes the vibration assembly 7 embedded in the raking mechanism 6 dynamically abut against the lifting air guide mechanism 3, generates high-frequency micro-vibration waves, collapses the bridging structure, when the raking mechanism 6 rotates, the flow speed of the airflow at the bottom is also increased, the airflow at the bottom is quickly guided to the lifting air guide mechanism 3 to forcibly diffuse the hot air to the entire tower wall, thereby avoiding the condensation and accumulation of the atomized droplets on the tower wall, improving the yield, and preventing the adhesion to the inner wall of the drying tower 1.

[0050] In a further embodiment of the present application, the driving member 4 comprises a driving motor 41 fixed at the bottom of the drying tower 1, and the output shaft of the driving motor 41 is provided with a connecting shaft sleeve 42, and the bottom of the lifting air guide mechanism 3 is movably inserted into the connecting shaft sleeve 42, specifically, the driving motor 41 drives the connecting shaft sleeve 42 to rotate through the output shaft, and since the lifting air guide mechanism 3 is movably inserted into the connecting shaft sleeve 42, the driving motor 41 can drive the lifting air guide mechanism 3 to rotate synchronously when the driving motor 41 rotates, but at the same time, the lifting air guide mechanism 3 is allowed to slide up and down relative to the connecting shaft sleeve 42 in the axial direction, so as to meet the needs of the lifting air guide mechanism 3 to lift up and down, and the connecting shaft sleeve 42 also plays a supporting and positioning role for the bottom of the lifting mechanism, so as to ensure that the lifting air guide mechanism 3 can be accurately pushed out from the middle of the drying tower 1.

[0051] In a further embodiment of the present application, the lifting air guide mechanism 3 comprises a shaft rod 31 movably inserted into the connecting shaft sleeve 42, and the top end of the shaft rod 31 is fixedly connected with an air guide disc 32, and the air guide disc 32 is located below the atomizing nozzle 2, and the bottom of the shaft rod 31 is fixedly connected with an abutting cross rod 33, and the drying tower 1 is fixedly connected with a guide ring 34 for the abutting cross rod 33 to lap, and the guide ring 34 is annularly provided with a plurality of arc-shaped grooves 35, specifically, the shaft rod 31 rotates under the driving of the driving member 4 and lifts up and down according to the movement state of the abutting cross rod 33, and the air guide disc 32 is located below the atomizing area and has a disc-shaped structure with a central protrusion, and its role is to push the hot air in the tower upward when the shaft rod 31 drives it to lift up, so as to expand the contact area of the hot air with the atomized liquid droplets and powder particles, and the abutting cross rod 33 at the bottom of the shaft rod 31 laps on the guide ring 34 fixed to the inner wall of the tower, and the guide ring 34 is stationary, and when the driving motor 41 drives the shaft rod 31 to rotate together with the abutting cross rod 33, the end of the abutting cross rod 33 slides on the annular surface of the guide ring 34 and the specific arc-shaped grooves 35, and when sliding to the smooth place, the shaft rod 31 is in a relatively high position, and when sliding to the recessed position of the arc-shaped grooves 35, the abutting cross rod 33 will sink along the groove, so that the entire shaft rod 31 and the air guide disc 32 at the top will descend a distance under the action of gravity, and after continuously rotating and sliding out of the recessed groove, the shaft rod 31 and the air guide disc 32 will rise again, and this process is repeated, so that the air guide disc 32 rotates while continuously moving up and down, forming a lifting stirring effect, which significantly enhances the up-and-down turbulence of the hot air flow, prevents the material from being hardened or stranded in a specific area, and improves the drying effect of the material in the drying tower 1.

[0052] In a further embodiment of the present application, the stirring mechanism 6 comprises a sleeve 61 coaxially sleeved with the shaft 31, and a plurality of blades 62 are fixedly connected to the outer wall of the sleeve 61, and a groove 63 adapted to the annular protrusion 5 is formed in the blade 62. Specifically, the stirring mechanism 6 is coaxially rotated with the rotating shaft 31 through the sleeve 61, so as to ensure that the driven part 4 is synchronously driven to rotate, but the shaft 31 can be lifted in the sleeve 61 to realize the up-down movement of the air guide disc 32. The plurality of blades 62 are annularly distributed on the outer sleeve 61 and extend to the position close to the bottom wall of the drying tower 1. The groove 63 on the outer side of the blade 62 is used to cooperate with the annular protrusion 5 of the funnel wall of the drying tower 1. On the one hand, when the blade 62 rotates, it produces strong shearing action on the accumulated material to break the agglomerates. On the other hand, the up-down movement of the stirring mechanism 6 can be limited by the limiting of the annular protrusion 5, so as to ensure that the vibration assembly 7 can stably and effectively act on the lifting air guide mechanism 3, avoid the adhesion of the incompletely dried material on the surface thereof, and because the gap between the blade 62 and the protrusion is small and the shape is special, the rotation can accelerate the flow of the tower bottom gas and the powder, make the accelerated ascending gas flow to the bottom surface of the air guide disc 32, change the flow direction of the gas through the air guide disc to diffuse to the tower wall of the drying tower 1, prevent the tower bottom dead zone and wall adhesion, promote the secondary dispersion of the powder and strengthen the bottom gas flow circulation, so that the material can be fully dried and is not easy to adhere to the tower wall of the drying tower 1.

[0053] In a further embodiment of the present application, the vibration assembly 7 comprises a pair of abutting rods 71 elastically inserted into the sleeve 61, a top spring 73 is installed between the abutting rod 71 and the sleeve 61, a key groove 36 is vertically formed on both sides of the shaft 31, an abutting tooth 37 is arranged in the key groove 36, one end of the abutting rod 71 extends into the key groove 36 and abuts with the abutting tooth 37, specifically, the pair of abutting rods 71 are elastically installed in the through hole of the sleeve 61 through the top spring 73, the inner end of the abutting rod 71 extends into the key groove 36 on the side of the shaft 31, so as to realize the synchronous rotation of the shaft 31 driving the material stirring mechanism 6, the inner wall of the key groove 36 is provided with a tooth-shaped structure, which can be a continuous rack or a tooth-shaped protrusion distributed at intervals, when the sleeve 61 rotates synchronously with the shaft 31 at a high speed together with the material stirring mechanism 6, the inner end of the abutting rod 71 is tightly pressed on the abutting tooth 37 in the key groove 36 due to the elastic force, with the rotation of the shaft 31, the shaft 31 is forced to rise or fall, the end of the abutting rod 71 will continuously slide through each abutting tooth 37 in the key groove 36, the abutting tooth 37 will generate an outward extrusion force on the abutting rod 71, at the same time, the compressed elastic member will release energy during the continuous lifting process, push the abutting rod 71 to rebound to the direction of the key groove 36 and contact the next abutting tooth 37, forming a continuous impact on the shaft 31, so that this vibration energy is transmitted to the sleeve 61 on the abutting rod 71, and then transmitted to the entire material stirring mechanism 6 and the shaft 31, this high-frequency vibration significantly reduces the adhesion of fine powder on the surface of the blade 62, the shaft 31 and the guide disc 32, effectively prevents scaling, and further loosens the powder in the contact area at the bottom of the tower, assisting the material stirring and gas lifting functions.

[0054] In a further embodiment of the present application, the blade 62 is fixedly connected with a flow guide cover 64 on both sides, respectively, the other end of the abutting rod 71 is symmetrically fixedly connected with a push air plate 72 located in each flow guide cover 64, specifically, the flow guide cover 64 is connected to the windward surface and the leeward surface of the blade 62, and has a cover-shaped structure with two open sides, forming a semi-closed or locally constrained space, which is similar to a micro air duct, the push air plate 72 is rigidly connected to the outer end of the abutting rod 71, that is, the end away from the key groove 36, when the abutting rod 71 does transverse displacement under the action of the vibration assembly 7, the push air plate 72 also synchronously does high-frequency reciprocating motion inside and outside the flow guide cover 64, which is equivalent to adding a high-frequency fan blade in the local airflow channel of the flow guide cover 64, the reciprocating motion of the push air plate 72 will periodically compress and expand the cavity volume formed by the push air plate 72 and the inner wall of the flow guide cover 64, so as to generate strong micro-pulse airflow in the flow guide cover 64, which is consistent with the vibration assembly 7 in frequency, this pulse airflow can more thoroughly remove the material adhered to the blade 62 and the surrounding area, and the pulse airflow disturbance is superimposed on the stable airflow generated by the rotation of the blade 62, greatly enhancing the local turbulent intensity and improving the powder dispersion efficiency and gas-solid heat transfer rate in this area.

[0055] In a further embodiment of the present application, the bottom of the drying tower 1 is provided with an annularly distributed discharge port 101, and the shaft 31 is fixedly connected with a discharge disc 8, which is located below the discharge port 101. Specifically, the discharge port 101 is the outlet through which the finished powder finally leaves the drying tower 1, and they are annularly distributed at the lowermost part of the funnel of the drying tower 1. The discharge disc 8 is fixedly installed on the rotating shaft 31, and its position is below the discharge port 101 and close to the outlet area of the tower bottom. Under the action of the rotating centrifugal force, the powder that is dried and settled or gathered on the upper surface of the discharge disc 8 is thrown outward, and at the same time, the airflow thrown out by the discharge disc 8 can also assist in guiding the falling powder to flow to the discharge port 101. The discharge disc 8 can also rise and fall with the shaft 31, so that the discharge disc 8 moves up and down in the area of the discharge port 101, thereby playing a guiding and auxiliary discharging role. When the material falls to the discharge disc 8, the rotating discharge disc 8 uniformly spreads it to all directions and throws it to the area of the annular discharge port 101, which helps to uniformly and continuously discharge the material and prevents the powder from accumulating or forming a bridge and being blocked above the discharge port.

[0056] In a further embodiment of the present application, an annular trapping net 9 is installed on the top inner wall of the drying tower 1, and the top surface of the annular trapping net 9 is provided with a plurality of heat conduction fins 91. Specifically, during the drying process, especially when fine powder is processed, a part of extremely fine dust will be carried by the rising airflow to the top area of the drying tower 1. The annular trapping net 9 has a small aperture, which can intercept the part of the ultra-fine material particles that have not been fully dried or have a particle size that is too small to completely settle, thereby avoiding their entering the tail gas pipeline and causing waste. The plurality of heat conduction fins 91 have the core function of collecting the excess heat in the drying tower 1 and continuously and uniformly heating the annular trapping net 9, so as to maintain its temperature higher than the dew point temperature of the surrounding gas. During the working process of the annular trapping net 9, the surface of the annular trapping net 9 is kept in a dry and hot state, which significantly reduces the risk of condensation on the surface of the trapping net. If the surface of the trapping net condenses and dew condenses, the fine powder will easily be adhered and hardened to form a mud-like dirt, which will quickly clog the mesh and cause failure. Heating maintains the "dry and hot" state of the trapping net, effectively preventing condensation, and at the same time, when the internal airflow circulates through the annular trapping net, it can absorb the heat stored in the heat conduction fins 91, so that the overall temperature of the vortex generated by the movement of the lifting air guide mechanism 3 is more uniform.

[0057] The above only describes certain exemplary embodiments of the present application by way of illustration, and it is needless to say that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present application. Therefore, the above figures and description are illustrative in nature and should not be understood as limiting the scope of protection of the claims of the present application.

Claims

1. A system for preparing a vitamin carrier with silicon dioxide, comprising a drying tower (1) and an atomizing nozzle (2) installed on the drying tower (1), characterized in that, Also include: Lifting air guide mechanism (3), which is installed in the drying tower (1) inside, and the bottom of drying tower (1) is installed with driving element (4) driving lifting air guide mechanism (3) rotation; The driving element (4) includes driving motor (41) fixed to the bottom of drying tower (1), the output shaft of driving motor (41) is installed with connecting shaft sleeve (42) in the drying tower (1), and the bottom of lifting air guide mechanism (3) is movably inserted into the connecting shaft sleeve (42); The lifting air guide mechanism (3) includes shaft rod (31) inserted into the connecting shaft sleeve (42), the top end of the shaft rod (31) is fixedly connected with air guide disc (32), the air guide disc (32) is located below the atomizing nozzle (2), the bottom of the shaft rod (31) is fixedly connected with the abutting cross bar (33), the inside of the drying tower (1) is fixedly connected with the guide ring (34) for the lapping of the abutting cross bar (33), and a plurality of arc grooves (35) are annularly distributed on the guide ring (34). The bottom of the drying tower (1) is funnel-shaped and is provided with a plurality of annular protrusions (5) distributed along the discharge direction, the lifting air guide mechanism (3) is sleeved with a raking mechanism (6) coaxially rotating therewith, the raking mechanism (6) is in clearance fit with the annular protrusions (5), the raking mechanism (6) is provided with a vibrating assembly (7) in abutting fit with the lifting air guide mechanism (3), the raking mechanism (6) includes a sleeve pipe (61) coaxially sleeved with the shaft rod (31), a plurality of blades (62) are fixedly connected to the outer wall of the sleeve pipe (61), and grooves (63) matched with the annular protrusions (5) are formed in the blades (62). The vibrating assembly (7) includes a pair of abutting rods (71) elastically inserted into the sleeve pipe (61), key grooves (36) are vertically formed on both sides of the shaft rod (31), abutting teeth (37) are arranged in the key grooves (36), one end of the abutting rod (71) extends into the key groove (36) and is in abutting fit with the abutting teeth (37). When the hot air enters the drying tower (1), the driving element (4) drives the lifting air guide mechanism (3) to push the hot air upward, and drives the raking mechanism (6) to rotate, so that the airflow at the bottom of the drying tower (1) is accelerated and blown to the lifting air guide mechanism (3) and diffused to the inner wall of the drying tower (1).

2. A system for the production of a vitamin carrier with silicon dioxide according to claim 1, characterized in that The blades (62) are respectively fixedly connected with flow guide covers (64) on both sides, and the other end of the abutting rod (71) is fixedly connected with air pushing plates (72) symmetrically arranged in the flow guide covers (64).

3. The system for preparing a vitamin carrier with silicon dioxide according to claim 1, characterized in that, The bottom of the drying tower (1) is provided with a ring-shaped discharge port (101), the shaft rod (31) is fixedly connected with a discharging disc (8), and the discharging disc (8) is located below the discharge port (101).

4. The system for preparing a vitamin carrier with silicon dioxide according to claim 1, characterized in that, The inner wall of the drying tower (1) is provided with a ring-shaped trapping net (9), and a plurality of heat conducting fins (91) are arranged on the top surface of the ring-shaped trapping net (9).

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