CN120836605A - A multi-stage temperature-controlled milk powder spray drying and agglomeration granulation device and method - Google Patents

Abstract

The invention discloses a multi-stage temperature-control milk powder spray drying and agglomerating granulation device and method, and relates to the technical field of milk powder production. The multi-section temperature-control milk powder spray drying and agglomerating granulating device comprises a working tower, wherein the working tower comprises a drying part and a granulating part, and further comprises a milk powder drying structure, a heat exchange device, a driving device and an agglomerating granulating structure. The multi-section temperature-control milk powder spray drying and agglomerating granulating device can adapt to the requirements of different drying stages of milk powder, avoid the problems of uneven hot air distribution and hot air blind areas and local temperature difference, improve the resource utilization rate, enable a low-temperature curing section to be rapidly shaped, avoid blanking blockage, improve the problems of uneven and embrittlement of traditional agglomerating particles, reduce wall sticking by a dynamic scraping structure, reduce the maintenance cost, avoid milk powder waste, realize multi-action cooperation by an integrated driving device and reduce equipment redundancy.

Description

Multi-stage temperature-control milk powder spray drying and agglomeration granulating device and method

Technical Field

The invention relates to the technical field of milk powder production, in particular to a multi-stage temperature-control milk powder spray drying and agglomeration granulating device and method.

Background

Under the background of rapid development of the milk powder industry, spray drying and agglomeration granulation are used as core processes for milk powder production, and the physical characteristics, nutrition retention and market acceptance of the product are directly determined. Along with the continuous improvement of the requirements of consumers on the quality (such as solubility, brewing property and nutrition activity) of milk powder and the increasingly severe requirements of large-scale production on energy consumption control and continuous stability, the traditional drying and granulating technology has difficulty in meeting the development trend of high-end and diversified technologies.

The spray drying of milk powder is to disperse concentrated milk liquid (solid content is 45% -60%) into tiny fogdrops through an atomizer, and then to contact with hot air to realize the process of rapid evaporation of water, and the core aim is to dry the fogdrops to the water content of 3% -5% in a short time, and simultaneously to keep the heat-sensitive components such as whey protein, vitamins and the like to the maximum extent. Agglomeration granulation is to aggregate the dried fine powder particles (100-200 μm) into larger particles (300-500 μm) by using a binder so as to improve the fluidity, the brewing property and the anti-caking capacity of the product and meet different consumption scenes.

The existing milk powder spray drying device and the agglomeration granulating device are two independent tower bodies which are connected through a pipeline, and the drying link adopts single-section high-temperature hot air, so that fog drops are heated unevenly easily, hard shells are formed by surface hardening, internal moisture is difficult to diffuse, particle solubility is poor, a large amount of heat-sensitive components are lost, and therefore, how to carry out multistage and uniform drying, and fog drops are heated evenly is a problem which needs to be solved at present.

Disclosure of Invention

According to the defects in the prior art, the invention provides a multi-stage temperature-control milk powder spray drying and agglomeration granulation device and method.

The invention provides a multi-stage temperature-controlled milk powder spray drying and agglomerating granulating device, which comprises a working tower, a milk powder drying structure, a heat exchange device, a driving device and an agglomerating granulating structure, wherein the working tower comprises a drying part and a granulating part, a first guide plate and a third guide plate are arranged in the drying part in parallel at intervals, the drying part is divided into a pre-drying section, a main drying section and a cooling transition section for carrying out sectional drying, the heat exchange device is used for carrying out blowing heat exchange on the outer wall of the drying part, and conveying hot air after heat exchange to the drying part and the granulating part, and the driving device is used for synchronously driving the milk powder drying structure and the agglomerating granulating structure to operate and respectively drying and granulating milk powder; the device comprises a driving device and a driving piece connected with the driving device, wherein the driving device synchronously drives the blowing barrel to rotate and the blowing structure to rotate and stretch reciprocally through the driving piece, so as to rotate the blowing barrel, clean and stir the inner wall of the pre-drying part.

The hot air device comprises a first air heater, a first conveying pipe, an air conveying box, an air inlet pipe and a ring pipe, wherein the first air heater is positioned outside a working tower, the air conveying box is positioned at the top of the working tower, the first conveying pipe is arranged between the first air heater and the air conveying box and is used for conveying hot air into the air conveying box, the ring pipe is rotatably arranged at the top of the air blowing box, the bottom of the ring pipe is in an opening shape, the lower end of the air inlet pipe is fixedly arranged on the ring pipe, the first end of the air inlet pipe is arranged on the air conveying box, the second air inlet pipe and a cooling device are further arranged outside the working tower, the air inlet pipe is arranged between the air conveying box and the first air blowing box, one end above the second air inlet pipe penetrates through the cooling device, and the cooling device is positioned at the top of the working tower and is positioned at one side of the air conveying box.

Further, the blowing cylinder is cylindrical, a deep groove is formed in the middle of the top of the blowing cylinder, a cavity is formed in the blowing cylinder, the cavity is communicated with the blowing cylinder, a plurality of blowing holes are formed in the surface of the blowing cylinder and communicated with the cavity, and an opening at the bottom of the circular pipe is communicated with the cavity in the blowing cylinder.

The cleaning structure further comprises a sliding block, wherein the sliding block is fixedly arranged at the bottom of the connecting end of the moving rod and the second connecting end of the curved rod, the second end of the curved rod is rotatably connected with the second end of the curved rod, the other end of the second end of the curved rod is rotatably connected with a moving rod, scraping plates are fixedly arranged at the other ends of the two moving rods on the same side, the rotating rod is rotatably arranged in a blowing barrel, the two ends of the rotating rod are respectively extended to the outside of the blowing barrel, a rotating groove matched with the rotating rod is formed in the blowing barrel, and the sliding block is fixedly arranged at the bottom of the connecting end of the moving rod and the second connecting end of the curved rod, is slidably connected with a fixing rod, and is fixedly arranged outside the blowing barrel and below the moving rod.

Further, a guide plate IV is arranged in the granulating part, the granulating part is divided into an agglomerating section and a low-temperature solidifying section, the agglomerating granulating structure further comprises an annular water pipe, the annular water pipe is located in the agglomerating section and is arranged on the inner wall of the working tower, a plurality of atomizing spray heads are annularly arranged on the annular water pipe along the circumferential direction of the annular water pipe, the annular water pipe is connected with a water delivery device, the water delivery device is located outside the working tower, the agglomerating granulating structure further comprises a connecting rod and a stirring rod, the connecting rod is fixedly arranged at the bottom of the blowing cylinder, the stirring rod is fixedly arranged at the lower position of the connecting rod, and the stirring rod is located in the low-temperature solidifying section.

The air blowing device comprises a working tower, a first air guiding plate, a second air guiding plate, a third air guiding plate, a connecting rod, an air blowing piece, a first air guiding plate, a second air guiding plate, a third air guiding plate and a fourth air guiding plate, wherein the first air guiding plate, the third air guiding plate and the fourth air guiding plate are respectively fixedly arranged on the inner wall of the working tower and incline downwards from outside to inside, the second air guiding plate is arranged between the first air guiding plate and the third air guiding plate and is positioned on the main drying section and fixedly arranged on the connecting rod, and the air blowing piece is respectively arranged between the first air guiding plate and the third air guiding plate and below the third air guiding plate and is used for rotating and blowing air into the working tower.

The first blowing part is a first blowing box, the first blowing box is located in the main drying section and located between the second guide plate and the first guide plate, the second blowing part is a second blowing box and located in the cooling transition section, the first blowing box, the second blowing box and the third blowing box respectively comprise a box body and a box cover, the box body and the box cover are annular, a plurality of air outlet holes are formed in the box cover and are fixed on a connecting rod through a cross rod, the box body is fixedly arranged on the inner wall of a working tower, a convex ring is arranged on the outer side wall of the box body, and a groove matched with the convex ring is formed in the inner side wall of the box cover.

The heat exchange device comprises a blower, a conveying pipe II and heat exchange boxes, wherein the blower is positioned outside a working tower, the two heat exchange boxes are arranged side by side and symmetrically and are semicircular, the heat exchange boxes are arranged outside the working tower, a plurality of heat exchange plates are fixedly arranged in the heat exchange boxes, the lower end of the conveying pipe II is arranged on the blower, the upper end of the conveying pipe II is provided with two air outlet channels, the two air outlet channels are respectively connected with the tops of the two heat exchange boxes, the bottoms of the two heat exchange boxes are respectively provided with a conveying pipe III, the lower end of the conveying pipe III on one side is connected with the blow box II in a conducting mode, and the lower end of the conveying pipe III on the other side is connected with the blow box III in a conducting mode.

The driving piece further comprises a second bevel gear, a third bevel gear and a mounting rod, wherein the third bevel gear is coaxially and symmetrically arranged and fixedly arranged on the periphery of the mounting rod, the lower end of the mounting rod is rotatably arranged in a deep groove in the air blowing barrel, the first bevel gear and the sleeve penetrate through the lower bevel gear and the sleeve from top to bottom in sequence, the radius of the second bevel gear and the third bevel gear is smaller than that of the first bevel gear, the second bevel gear and the third bevel gear are fixedly arranged on the upper position of the mounting rod, and the third bevel gear is an irregular bevel gear and is intermittently connected with the second bevel gear in a meshed mode.

S1, atomizing and spraying liquid milk from the top of the inside of a working tower, blowing hot air out from a blowing hole on a blowing barrel, pre-drying fog drops, and guiding the pre-dried fog drops to a main drying section through a first guide plate; S2, pre-drying, driving a bevel gear three to rotate by a driver through a bevel gear, driving a blowing cylinder to rotate by a sleeve pipe in the S21 and lower bevel gears, uniformly drying fog drops in a pre-drying section, enabling a mounting rod to rotate positively and negatively by meshing connection of the bevel gear three with an upper bevel gear two and a lower bevel gear two, driving a scraping plate to horizontally move to the position of the blowing cylinder by a rotating rod in the S221 and forward rotation, slowly stirring the fog drops, driving the scraping plate to horizontally move to the inner position of a working tower by the rotating rod in the S222 and reverse rotation, scraping sticky fog drops on the inner wall, conveying hot air cooled by a cooling device in an air inlet pipe two to a blowing box I for main drying, guiding the dried milk powder to a cooling transition section from the upper side of a guide plate II to the lower side of the guide plate III in the main drying process, enabling the blowing cylinder to rotate by a connecting rod in the pre-drying process, enabling a box cover in the blowing box I to rotate for uniform drying, conveying the fog drops to be conveyed to two heat exchange boxes through a conveying pipe II, conveying the scraping the sticky milk powder drops on the inner wall to the inner wall by the horizontal moving horizontally, cooling pipe II after the heat exchange conveying pipe III, cooling the dry milk powder drops to be completely cooled and completely, and cooling the dry milk drops in the air box II after the air cooling section is completely cooled down by the air conveying pipe II, and cooling the air boxes after the air boxes are completely in a cooling transition section, and the drying box is completely after the drying box is completely cooled, and the dry air box is completely cooled down, s7, uniformly blowing, cooling and solidifying agglomerated milk powder particles by hot air in a blowing box III, and when the agglomerated milk powder particles fall, driving a stirring rod to rotate by a connecting rod so as to slowly stir the milk powder particles.

The invention has the following beneficial effects:

The multistage temperature-controlled milk powder spray drying and agglomerating granulating device adapts to the requirements of different drying stages of milk powder through multistage accurate temperature control, ensures that hot air is supplied in a rotating mode to be uniformly distributed everywhere, avoids uneven hot air distribution and the problems of hot air dead areas and local temperature differences, improves the resource utilization rate through recycling waste heat, uniformly sprays adhesive to be matched with stirring to break up caking, rapidly shapes a low-temperature curing section, avoids blanking blockage, improves the problems of uneven and embrittlement of traditional agglomerating particles, dynamically cleans the inner wall, reduces the sticky wall, reduces the maintenance cost, avoids milk powder waste, realizes multi-action cooperation by an integrated driving device, and reduces equipment redundancy.

Of course, it is not necessary for any one product to practice the invention to achieve all of the advantages set forth above at the same time.

Drawings

FIG. 1 is a schematic diagram of the structure of the present invention;

FIG. 2 is a schematic view of the structure of FIG. 1 from another perspective in accordance with the present invention;

FIG. 3 is a schematic view of the structure of the inside of the working tower of the present invention;

FIG. 4 is a schematic view of the structure of the drying section of the inventive tower;

FIG. 5 is a schematic view of the structure of the granulation section in the working tower of the present invention;

FIG. 6 is a schematic view of the structure of the blowing barrel and the scraping structure of the present invention;

FIG. 7 is a schematic view of a driving member according to the present invention;

FIG. 8 is a schematic view of the structure of the present invention when the scraping structure is recovered;

FIG. 9 is a schematic view of the structure of the interior of the heat exchange box of the present invention;

FIG. 10 is a schematic view showing the structure of a blow box III according to the present invention;

fig. 11 is a schematic diagram of the structure of fig. 5 a according to the present invention.

In the figure, 1, a working tower, 2, a heat blower, 3, a conveying pipe I, 4, a wind conveying box, 5, an air inlet pipe I, 6, a loop, 7, a wind blowing cylinder, 8, a sleeve, 9, a bevel gear I, 10, a driver, 11, a bevel gear II, 12, a bevel gear III, 13, a mounting rod, 14, a rotating rod, 15, a bent rod I, 16, a bent rod II, 17, a moving rod, 18, a sliding block, 19, a fixed rod, 20, a scraper, 21, a guide plate I, 22, a wind blowing box I, 23, a guide plate II, 24, a guide plate III, 25, a wind blowing box II, 26, a guide plate IV, 27, a wind blowing box III, 28, a stirring rod, 29, a cross rod, 30, a convex ring, 31, an air inlet pipe II, 32, a cooling device, 33, a blower 34, a conveying pipe II, 35, a heat exchange box 36, a heat exchange plate 37, a conveying pipe III, 38, a ring-shaped water pipe 39, a water conveying device 40 and a connecting rod.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In the description of the present invention, it should be understood that the terms "open," "upper," "lower," "thickness," "top," "middle," "length," "inner," "peripheral," and the like indicate orientation or positional relationships, merely for convenience in describing the present invention and to simplify the description, and do not indicate or imply that the components or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.

Referring to fig. 1-11, an embodiment of the invention provides a multi-stage temperature-controlled spray drying and agglomerating granulation device for milk powder, which comprises a working tower 1, wherein the working tower 1 comprises a drying part and a granulation part, and further comprises a milk powder drying structure, a heat exchange device, a driving device and an agglomerating granulation structure, the heat exchange device is used for carrying out blowing heat exchange on the outer wall of the drying part, conveying the hot air after heat exchange to the drying part and the granulation part, and the driving device is used for synchronously driving the milk powder drying structure and the agglomerating granulation structure to operate and respectively drying and granulating the milk powder.

The drying part is divided into a pre-drying section, a main drying section and a cooling transition section for sectional drying, the granulating part is provided with a guide plate IV 26, and the granulating part is divided into an agglomeration section and a low-temperature solidification section.

The drying part is divided into the pre-drying section, the main drying section and the cooling transition section, so that the drying part is subjected to sectional temperature control drying, and uneven heating of fog drops caused by single-section high-temperature hot air is avoided.

The heat exchange device comprises a blower 33, a second conveying pipe 34 and heat exchange boxes 35, wherein the blower 33 is positioned outside the working tower 1, the heat exchange boxes 35 are arranged side by side and symmetrically provided with two heat exchange plates 36 which are semicircular, the heat exchange boxes 35 are arranged outside the working tower 1, the heat exchange boxes 35 are fixedly provided with a plurality of heat exchange plates 36, the lower ends of the second conveying pipe 34 are arranged on the blower 33, the upper ends of the second conveying pipe 34 are provided with two air outlet channels, the two air outlet channels are respectively connected with the tops of the two heat exchange boxes 35, the bottoms of the two heat exchange boxes 35 are respectively provided with a third conveying pipe 37, the lower ends of the third conveying pipe 37 on one side are connected with the second blowing box 25 in a conducting manner, and the lower ends of the third conveying pipe 37 on the other side are connected with the third blowing box 27 in a conducting manner.

In this embodiment, the heat exchange box 35 is located outside the pre-drying section in the working tower 1, and the outer wall will form heat radiation (outer wall temperature about 60-80 ℃) due to the high internal temperature (120-140 ℃) during operation of the pre-drying section of the working tower 1. The two semicircular heat exchange boxes 35 are tightly attached to the outer wall of the working tower 1, and a plurality of heat exchange plates 36 (made of aluminum alloy materials and high in heat conductivity coefficient) in the two semicircular heat exchange boxes absorb the part of waste heat through heat conduction, so that the temperature of air in the heat exchange boxes 35 is increased. The air blower 33 sends the cold air at normal temperature into the heat exchange box 35 through the second conveying pipe 34, the cold air is heated after contacting with the heat exchange plates 36, and the temperature is raised to 40-50 ℃. The heated hot air is divided into two paths through a conveying pipe III 37, and is respectively conveyed to a blow box II 25 of the cooling transition section and a blow box III 27 of the low-temperature solidification section, so that medium-low-temperature hot air is provided for the two sections. The high-temperature waste heat is fully utilized, the resource waste is avoided, and the too high temperature of the inner wall of the pre-drying section of the working tower 1 can be avoided, so that the fog drops adhered on the working tower 1 are pasted.

Specifically, the first guide plate 21, the third guide plate 24 and the fourth guide plate 26 are respectively fixed on the inner wall of the working tower 1 and incline downwards from outside to inside, and the second guide plate 23 is arranged between the first guide plate 21 and the third guide plate 24, is positioned on the main drying section and is fixed on the connecting rod 40 and incline downwards from inside to outside.

In this embodiment, the first baffle 21, the third baffle 24 and the fourth baffle 26 are fixed on the inner wall of the working tower 1, and the materials are guided to gather from the tower wall to the center by adopting 'tilting from outside to inside', so that the materials attached to the tower wall can be guided to the center (if the mist drops in the pre-drying section adhere to the wall, the mist drops slide to the center area along the first baffle 21 to participate in drying again), thereby reducing the wall adhering loss rate. The second guide plate 23 positioned in the main drying section adopts 'from inside to outside' to disperse the central material towards the tower wall direction, so that the material changes the movement direction in the falling process, the residence time is prolonged, the contact area with hot air blown out by the first blowing box 22 is enlarged, and the drying uniformity and the full drying are ensured.

The rotary motion of the second guide plate 23 breaks the accumulation of materials, avoids the drying dead angle caused by local 'holding and group', and reduces the deviation of the water content of the materials.

Specifically, one blowing part is a first blowing box 22, the first blowing box 22 is located in the main drying section and is arranged between a second guide plate 23 and the first guide plate 21, and the other blowing part is a second blowing box 25 and is located below a third guide plate 24 in the cooling transition section.

The first blowing box 22, the second blowing box 25 and the third blowing box 27 respectively comprise a box body and a box cover, the box body and the box cover are annular, a plurality of air outlet holes are formed in the box cover and are fixed on the connecting rod 40 through the cross rod 29, the box body is fixedly arranged on the inner wall of the working tower 1, a convex ring 30 is arranged on the outer side wall of the box body, a groove matched with the convex ring 30 is formed in the inner side wall of the box cover, the convex ring 30 of the box body is in sliding fit with the groove of the box cover, free rotation of the box cover is guaranteed, hot air leakage can be effectively prevented, and energy waste caused by overlarge gaps is avoided.

In this embodiment, the air box 4 delivers hot air into the air inlet pipe two 31, and the hot air cooled to 80-100 ℃ in the air inlet pipe two 31 is delivered into the air box one 22 through the cooling device 32. The air outlet hole of the first air blowing box 22 is inclined downwards, so that the pre-dried fog drops falling from the first guide plate 21 and the materials on the second guide plate 23 can be dried by blowing, and the box cover can rotate along with the rotation of the connecting rod 40 so as to perform uniform air supply drying.

The third conveying pipe 37 on one side naturally cools the heat-exchanged hot air in the conveying process to 30-40 ℃ and conveys the heat-exchanged hot air into the second blowing box 25. The air outlet hole of the second air blowing box 25 is inclined upwards, so that dried milk powder falling from the third guide plate 24 can be blown and cooled, and the box cover can rotate along with the rotation of the connecting rod 40 so as to uniformly blow and cool.

The rotating box cover enables hot air to form dynamic air flow through the air outlet, the coverage range is enlarged to the whole annular area, the hot air is uniformly distributed, and local temperature difference is avoided.

The milk powder drying structure comprises a blowing drum 7, a scraping structure and a hot air device positioned outside the working tower 1, wherein the blowing drum 7 is rotatably arranged in the drying part and used for supplying air for predrying, the scraping structure is arranged on the blowing drum 7, and the hot air device is used for conveying air to the drying part.

The milk powder drying structure further comprises two air blowing pieces which are arranged on the main drying section and the cooling transition section, wherein the air blowing pieces are used for carrying out rotary air supply and are respectively connected with the hot air device and the heat exchange device and are respectively used for carrying out air blowing main drying and cooling.

Specifically, the blowing cylinder 7 is cylindrical, a deep groove is formed in the middle position of the top of the blowing cylinder 7, a cavity is formed in the blowing cylinder 7, the cavity is communicated with the inside of the blowing cylinder, a plurality of blowing holes are formed in the surface of the blowing cylinder 7 and communicated with the cavity, and an opening at the bottom of the ring pipe 6 is communicated with the cavity in the blowing cylinder 7.

The hot air device comprises a hot air device 2, a first conveying pipe 3, a first air conveying box 4, a first air inlet pipe 5 and a circular pipe 6, wherein the hot air device 2 is arranged outside the working tower 1, the first air conveying box 4 is arranged at the top of the working tower 1, the first conveying pipe 3 is arranged between the hot air device 2 and the first air conveying box 4 and is used for conveying hot air into the first air conveying box 4, the circular pipe 6 is rotatably arranged at the top of a blowing pipe 7, the bottom of the circular pipe 6 is in an opening shape, the lower end of the first air inlet pipe 5 is fixedly arranged on the circular pipe 6, and the other end of the first air inlet pipe 5 is arranged on the first air conveying box 4.

The hot air device further comprises a second air inlet pipe 31 and a cooling device 32, the second air inlet pipe 31 is positioned outside the working tower 1 and is arranged between the air conveying box 4 and the first blowing box 22, one end above the second air inlet pipe 31 penetrates through the cooling device 32, and the cooling device 32 is positioned at the top of the working tower 1 and is positioned at one side of the air conveying box 4.

In this embodiment, the air box 4 delivers the hot air of 120-140 ℃ to the air blowing barrel 7 through the air inlet pipe I5 and the annular pipe 6, so that the hot air fills the whole cavity and is blown out from the air blowing holes on the air blowing barrel 7.

The air blowing tube 7 uniformly diffuses hot air from the center of the working tower 1 to the periphery, radiates air from the center to the periphery, forms a heat exchange area with milk mist drops sprayed from the tower top in a pre-drying section, and fully contacts with the hot air in the falling process of the mist drops, so that the quick evaporation of free water on the surface is completed, the efficient primary drying of the mist drops in the pre-drying section is realized, and the surface hardening or insufficient drying of the mist drops due to uneven heating is avoided.

The spirally arranged blowing holes enable hot air to rise in a 'rotary air flow' manner, so that the residence time of fog drops in a pre-drying section is prolonged, and a uniform foundation is laid for deep dehydration of a subsequent main drying section. And the radiation air flow formed by central air supply generates outward thrust to the falling fog drops, so that the aggregation trend of the fog drops due to surface tension is broken, and the adhesion of small fog drops into large liquid drops is avoided.

Specifically, the scraping structure comprises rotary rods 14, the rotary rods 14 are arranged in parallel and are arranged at intervals, two ends of the two rotary rods 14 are respectively and rotatably connected with a first curved rod 15, the other end of the first curved rod 15 is rotatably connected with a second curved rod 16, the other end of the second curved rod 16 is rotatably connected with a movable rod 17, scraping plates 20 are fixedly arranged at the other ends of the two movable rods 17 on the same side, the rotary rods 14 are rotatably arranged in a blowing barrel 7, the two ends of the rotary rods 14 respectively extend to the outside of the blowing barrel 7, and a rotary groove matched with the rotary rods 14 is formed in the blowing barrel 7.

The cleaning structure further comprises a sliding block 18, the sliding block 18 is fixedly arranged at the bottom of the connecting end of the movable rod 17 and the second curved rod 16, the sliding block 18 is connected with a fixed rod 19 in a sliding mode, and the fixed rod 19 is fixedly arranged outside the air blowing barrel 7 and is located below the movable rod 17.

In this embodiment, the sliding block 18 is a square block, and the fixed rod 19 is provided with a sliding groove adapted to the sliding block 18, so as to guide the movement of the moving rod 17, and avoid the deflection of the scraping plate 20 caused by the centrifugal force generated by the rotation of the blowing cylinder 7, thereby ensuring uniform contact during scraping and stable action during stirring. The first curved rod 15, the second curved rod 16, the movable rod 17 and the fixed rod 19 are respectively provided with a strip-shaped groove, so that mist drops are convenient to fall down, and mist drops are prevented from being accumulated on the surfaces.

When the rotary rod 14 is driven to rotate positively, the first 15 and the second 16 drive the movable rod 17 to shrink towards the blowing cylinder 7 along the fixed rod 19, the scraping plate 20 is separated from the tower wall, the scraping plate 20 rotates along with the blowing cylinder 7 to form a stirring flow field, the fog drop group of the pre-drying section is disturbed, the contact efficiency of fog drops and hot air is improved, the pre-drying time is shortened, and when the rotary rod is reversely rotated, the first 15 and the second 16 push the movable rod 17 to stretch outwards, and the scraping plate 20 is in close contact with the tower wall so as to thoroughly strip wall-adhered accumulated materials.

The agglomeration granulation structure comprises a third blow box 27 positioned in the low-temperature solidification section and is connected with a heat exchange device for rotary air supply low-temperature solidification.

Specifically, the agglomeration granulation structure further comprises an annular water pipe 38, a connecting rod 40 and a stirring rod 28, wherein the connecting rod 40 is fixedly arranged at the bottom of the air blowing barrel 7, the stirring rod 28 is fixedly arranged at the lower position of the connecting rod 40, the stirring rod 28 is positioned at the low-temperature curing section, the annular water pipe 38 is positioned at the agglomeration section and is arranged on the inner wall of the working tower 1, a plurality of atomization spray heads are annularly arranged on the annular water pipe 38 along the circumferential direction of the annular water pipe 38, the annular water pipe 38 is connected with a water delivery device 39, and the water delivery device 39 is positioned outside the working tower 1.

In this embodiment, the annular water pipe 38 is externally sleeved with a plurality of fixing rings, and the fixing rings are arranged on the inner wall of the agglomeration section of the working tower 1, and the fixing rings spray adhesive liquid drops to the falling milk powder particles through circumferentially distributed atomizing nozzles, so that thin water films are formed on the surfaces of the particles, and the particles are mutually bonded to form agglomerates by means of surface tension.

The connecting rod 40 drives the stirring rod 28 to rotate in the low-temperature curing section, breaking up the excessively bonded large agglomerates and making the agglomerated particle size uniform. The other delivery pipe III 37 delivers the hot air after heat exchange to the blow box III 27, in the process, the hot air is naturally cooled to 20-25 ℃ due to delivery, the blow box III 27 rotationally delivers the hot air of 20-25 ℃ provided by the heat exchange device to the low-temperature curing section, and the moisture on the surface of the particles is quickly evaporated, so that the agglomerated structure is shaped.

The driving device comprises a driver 10 and a driving piece connected with the driver 10, and the driver 10 synchronously drives the blowing drum 7 to rotate and the cleaning structure to rotate and stretch back and forth through the driving piece, so as to rotate and blow air and clean and stir the inner wall of the pre-drying part.

Specifically, the driving piece comprises two bevel gears 9 which are connected in a meshed manner, a sleeve 8 is arranged at the bottom of one bevel gear 9 below, the lower end of the sleeve 8 penetrates through the top of the working tower 1 and is fixedly arranged at the top of the air blowing barrel 7, the other bevel gear 9 is arranged at the output end of a driver 10, and the driver 10 is arranged at the top of the working tower 1 through screws.

The driving piece further comprises a bevel gear II 11, two bevel gears III 12 and a mounting rod 13, the two bevel gears III 12 are coaxially and symmetrically arranged and fixedly arranged on the periphery of the mounting rod 13, the lower end of the mounting rod 13 is rotatably arranged in a deep groove in the air blowing barrel 7, the lower end of the mounting rod penetrates through the bevel gear I9 and the sleeve 8 from top to bottom, and the rotating rod 14 is fixedly arranged on the periphery of the mounting rod 13.

The radius of the second bevel gear 11 and the third bevel gear 12 is smaller than that of the first bevel gear 9, the two bevel gears 11 are fixedly arranged on the mounting rod 13 at the upper position, and the third bevel gear 12 is an irregular bevel gear and is intermittently meshed with the two bevel gears 11.

In this embodiment, the driver 10 drives two bevel gears 9 to rotate, so that the bevel gears 9 below drive the air blowing tube 7 to rotate through the sleeve 8, the sleeve 8 is located on the inner side of the ring tube 6, the air blowing tube 7 is prevented from being blocked from rotating, the air blowing tube 7 rotates, hot air in the air blowing tube is discharged in a rotating mode, fogdrops in a pre-drying section are fully and uniformly pre-dried, and one end, in contact with the inner wall of the working tower 1, of the scraper 20 is inclined, so that fogdrops attached to the inner wall of the drying section of the working tower 1 are fully scraped.

In the process, the bevel gear I9 above drives the bevel gear II 11 to rotate, when the bevel gear I is meshed and connected with one bevel gear III 12, the bevel gear III 12 drives the rotary rod 14 to rotate through the mounting rod 13, the first 15 and the second 16 crank rods are pushed, the moving rod 17 drives the scraping plate 20 to horizontally move and not contact with the inner wall of the pre-drying section in the working tower 1, in the process, the blowing cylinders 7 rotate to drive the scraping plates 20 on two sides to rotate, the scraping plates 20 slowly stir fog drops in the pre-drying section, so that full pre-drying is achieved, when the bevel gear II 11 is meshed and connected with the other bevel gear III 12, the rotary rod 14 reversely rotates, the first 15 and the second 16 crank rods are pulled, the moving rod 17 drives the scraping plate 20 to horizontally move outwards and contact with the inner wall of the pre-drying section in the working tower 1, and the adhered milk powder fog drops on the inner wall are scraped.

A multi-stage temperature-controlled milk powder spray drying and agglomeration granulation method, which comprises the following steps:

S1, in the spray drying process of milk powder, liquid milk is atomized and sprayed out from the top of the inside of a working tower 1, in the process, a heater 2 conveys hot air at 120-140 ℃ into a blowing cylinder 7 through a wind conveying box 4, a first air inlet pipe 5 and a ring pipe 6, and blows out from a wind blowing hole on the blowing cylinder 7, pre-drying is carried out on fog drops, and the pre-dried fog drops are guided to a main drying section through a first guide plate 21 and fall onto a second guide plate 23;

s2, driving the bevel gear I9 to rotate by the driver 10 and driving the bevel gear III 12 to rotate while pre-drying;

S21, driving the air blowing tube 7 to rotate by the bevel gear I9 below through the sleeve 8, and uniformly drying fog drops in the pre-drying section;

s22, rotating the third bevel gear 12, intermittently meshing and connecting the third bevel gear with the second upper and lower bevel gears 11, so that the mounting rod 13 rotates positively and negatively;

s221, when the rotary rod 14 is driven to rotate in the forward rotation process, the first 15 and the second 16 crank rods are pulled, so that the moving rod 17 drives the scraping plate 20 to horizontally move towards the position of the air blowing barrel 7, and mist drops are slowly stirred, so that uniform predrying is ensured;

S222, when the rotary rod 14 reversely rotates, the first 15 and the second 16 crank rods are pushed, the moving rod 17 drives the scraping plate 20 to horizontally move towards the inner position of the working tower 1, the scraping plate 20 is in contact with the inner wall of the pre-drying section of the working tower 1, and the sticky milk powder mist drops on the inner wall are scraped;

S3, in the pre-drying process, the air conveying box 4 conveys 80-100 ℃ hot air cooled by the cooling device 32 to the first air blowing box 22 through the second air inlet pipe 31, and main drying is carried out on pre-dried fog drops which fall from the first air blowing box 22 and fall onto the second guide plate 23, and main dried milk powder slides down from the second guide plate 23 and is guided to a cooling transition section through the third guide plate 24;

S4, in the pre-drying process, the blowing cylinder 7 rotates, the cross rod 29 is driven to rotate through the connecting rod 40, and the box cover in the first blowing box 22 rotates to perform uniform air supply drying;

S5, simultaneously, the air blower 33 conveys cold air into the two heat exchange boxes 35 through the conveying pipes II and III 37, the heat exchanged hot air is naturally cooled through the conveying pipes III 37 and is respectively conveyed to the air blowing box II and the air blowing box III 27, the hot air at 30-40 ℃ conveyed into the air blowing box II 25 is blown out from the box cover, the cross rod 29 drives the box cover to rotate, and the milk powder after main drying is uniformly cooled and transited;

S6, the completely dried milk powder falls into an agglomeration section, the annular water pipe 38 sprays adhesive liquid drops so that the milk powder is adhered, and the adhered milk powder falls into a low-temperature curing section through the guide plate IV 26;

S7, hot air at 20-25 ℃ conveyed into the third blowing box 27 is blown out from the corresponding box cover, the cross rod 29 drives the box cover to rotate, agglomerated milk powder particles are uniformly blown, cooled and solidified, and when falling, the connecting rod 40 drives the stirring rod 28 to rotate, so that the milk powder particles are slowly stirred, and the phenomenon that the bonding blocks an outlet is avoided.

When the air heater 2, the driver 10, the blower 33 and the water delivery device 39 are operated, the air heater 2 respectively delivers hot air to the first air inlet pipe 5 and the second air inlet pipe 31 through the air delivery box 4, so that 120-140 ℃ hot air is delivered to the air blowing barrel 7 through the first air inlet pipe 5, and 80-100 ℃ hot air cooled by the cooling device 32 is delivered to the first air blowing box 22 through the second air inlet pipe 31. The blower 33 conveys cold air to the two heat exchange boxes 35 through the second conveying pipe 34, and the hot air after heat exchange is naturally cooled through the third conveying pipe 37 and is conveyed to the second blow box 25 and the third blow box 27 respectively.

The liquid milk is atomized and sprayed out from the top of the inside of the working tower 1, the air heater 2 conveys hot air at 120-140 ℃ into the air blowing cylinder 7 through the air blowing cylinder 4, the air inlet pipe 5 and the annular pipe 6, the mist drops are pre-dried and guided to the main drying section through the guide plate 21 and fall onto the guide plate 23, and the air blowing cylinder 22 carries out air blowing drying on the fallen mist drops and the mist drops on the guide plate 23.

In the process, the driver 10 drives the first bevel gear 9 to rotate and drives the third bevel gear 12 to rotate, and the first bevel gear 9 below drives the air blowing barrel 7 to rotate through the sleeve 8 so as to uniformly blow and dry fog drops in the pre-drying section.

The bevel gear III 12 rotates, and when being connected with the bevel gear II 11 in a meshed manner, the bevel gear III rotates positively to drive the rotary rod 14 to rotate, and the first 15 and the second 16 crank rods are pulled to enable the moving rod 17 to drive the scraping plate 20 to horizontally move towards the air blowing barrel 7, and at the moment, the air blowing barrel 7 drives the scraping plate 20 to rotate to slowly stir fog drops, so that uniform predrying is ensured.

When the rotary rod 14 is in meshed connection with the other bevel gear II 11, the rotary rod 14 reversely rotates to push the first crank rod 15 and the second crank rod 16, so that the movable rod 17 drives the scraping plate 20 to horizontally move towards the inner position of the working tower 1, the scraping plate 20 is in contact with the inner wall of the pre-drying section of the working tower 1, and at the moment, the air blowing barrel 7 drives the scraping plate 20 to rotate to clean and scrape viscous milk powder droplets on the inner wall.

The 30-40 ℃ hot air conveyed into the second blowing box 25 is blown out from the box cover, the cross rod 29 drives the box cover to rotate, the milk powder after main drying is uniformly cooled and transited, the milk powder after complete drying falls into the agglomeration section, the annular water pipe 38 sprays adhesive liquid drops, so that the milk powder is bonded, and the bonded milk powder falls into the low-temperature curing section through the guide plate IV 26.

The 20-25 ℃ hot air conveyed into the third blowing box 27 is blown out from the corresponding box cover, the cross rod 29 drives the box cover to rotate, the agglomerated milk powder particles are uniformly blown, cooled and solidified, and when falling, the connecting rod 40 drives the stirring rod 28 to rotate, so that the milk powder particles are slowly stirred, and the blocking of the outlet due to adhesion is avoided.

It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

The preferred embodiments of the invention disclosed above are intended only to assist in the explanation of the invention. The preferred embodiments are not exhaustive or to limit the invention to the precise form disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best understand and utilize the invention. The invention is limited only by the claims and the full scope and equivalents thereof.

Claims (10)

1. The multi-section temperature-controlled milk powder spray drying and agglomerating granulating device comprises a working tower (1), wherein the working tower (1) comprises a drying part and a granulating part, a first guide plate (21) and a third guide plate (24) are arranged in the drying part in parallel at intervals, the drying part is divided into a pre-drying section, a main drying section and a cooling transition section for section drying, and the multi-section temperature-controlled milk powder spray drying and agglomerating granulating device is characterized by further comprising a milk powder drying structure, a heat exchange device, a driving device and an agglomerating granulating structure, wherein the heat exchange device is used for carrying out blowing heat exchange on the outer wall of the drying part, conveying hot air after heat exchange to the drying part and the granulating part, and the driving device is used for synchronously driving the milk powder drying structure and the agglomerating granulating structure to dry and granulate milk powder respectively;

The milk powder drying structure comprises a blowing barrel (7), a scraping structure and a hot air device positioned outside the working tower (1), wherein the blowing barrel (7) is rotatably arranged in the drying part and used for blowing air to perform predrying, and the scraping structure is arranged on the blowing barrel (7);

the agglomeration granulation structure comprises a blow box III (27) and is connected with a heat exchange device for rotary air supply low-temperature solidification;

The driving device comprises a driver (10) and a driving piece connected with the driver (10), and the driver (10) synchronously drives the air blowing barrel (7) to rotate and the cleaning structure to rotate and stretch back and forth through the driving piece, so as to rotate air supply and clean and stir the inner wall of the pre-drying part.

2. The multi-stage temperature-controlled milk powder spray drying and agglomerating granulation device according to claim 1, wherein the hot air device comprises a heat air blower (2), a first conveying pipe (3), a first air conveying box (4), a first air inlet pipe (5) and a circular pipe (6), wherein the heat air blower (2) is positioned outside a working tower (1), the first air conveying box (4) is positioned at the top of the working tower (1), and the first conveying pipe (3) is arranged between the heat air blower (2) and the first air conveying box (4) and is used for conveying hot air into the first air conveying box (4);

The circular pipe (6) is rotatably arranged at the top of the air blowing pipe (7), the bottom of the circular pipe (6) is in an opening shape, the lower end of the first air inlet pipe (5) is fixedly arranged on the circular pipe (6), and the other end of the first air inlet pipe (5) is arranged on the air conveying box (4);

The hot air device further comprises a second air inlet pipe (31) and a cooling device (32), the second air inlet pipe (31) is located outside the working tower (1) and is arranged between the air conveying box (4) and the first air blowing box (22), one end above the second air inlet pipe (31) penetrates through the cooling device (32), the cooling device (32) is located at the top of the working tower (1) and is located at one side of the air conveying box (4).

3. The multi-section temperature-controlled milk powder spray drying and agglomerating granulating device according to claim 2, wherein the blowing barrel (7) is cylindrical, a deep groove is formed in the middle of the top of the blowing barrel, a cavity is formed in the blowing barrel (7) and communicated with the inside of the cavity, a plurality of blowing holes are formed in the surface of the blowing barrel (7) and communicated with the cavity, and an opening at the bottom of the ring pipe (6) is communicated with the cavity in the blowing barrel (7).

4. The multi-section temperature-controlled milk powder spray drying and agglomerating granulating device according to claim 3, wherein the scraping structure comprises rotating rods (14), the rotating rods (14) are arranged in parallel and are arranged at intervals, two ends of each rotating rod (14) are respectively and rotatably connected with a first curved rod (15), the other end of each curved rod (15) is rotatably connected with a second curved rod (16), the other end of each curved rod (16) is rotatably connected with a movable rod (17), and scraping plates (20) are fixedly arranged at the other ends of the two movable rods (17) on the same side;

The rotary rod (14) is rotatably arranged in the blowing cylinder (7), two ends of the rotary rod (14) respectively extend to the outside of the blowing cylinder (7), and a rotary groove matched with the rotary rod (14) is formed in the blowing cylinder (7);

The cleaning structure further comprises a sliding block (18), the sliding block (18) is fixedly arranged at the bottom of the connecting end of the movable rod (17) and the second curved rod (16), the sliding block (18) is connected with a fixed rod (19) in a sliding mode, and the fixed rod (19) is fixedly arranged outside the blowing cylinder (7) and located below the movable rod (17).

5. The multi-section temperature-controlled milk powder spray drying and agglomerating granulating device according to claim 1, wherein the granulating part is provided with a guide plate IV (26), the granulating part is divided into an agglomerating section and a low-temperature solidifying section, the agglomerating granulating structure further comprises an annular water pipe (38), the annular water pipe (38) is positioned in the agglomerating section and is arranged on the inner wall of the working tower (1), a plurality of atomizing spray heads are annularly arranged on the annular water pipe (38) along the circumferential direction of the annular water pipe, the annular water pipe (38) is connected with a water delivery device (39), and the water delivery device (39) is positioned outside the working tower (1);

The agglomeration granulation structure further comprises a connecting rod (40) and a stirring rod (28), wherein the connecting rod (40) is fixedly arranged at the bottom of the air blowing barrel (7), the stirring rod (28) is fixedly arranged at the lower position of the connecting rod (40), and the stirring rod (28) is positioned at the low-temperature curing section.

6. The multi-section temperature-controlled milk powder spray drying and agglomerating granulating device of claim 5, wherein the first guide plate (21), the third guide plate (24) and the fourth guide plate (26) are respectively fixedly arranged on the inner wall of the working tower (1) and are inclined downwards from outside to inside for guiding;

a second guide plate (23) is arranged between the first guide plate (21) and the third guide plate (24), is positioned on the main drying section, is fixedly arranged on the connecting rod (40), and guides the air obliquely downwards from inside to outside;

And blowing pieces are respectively arranged between the first guide plate (21) and the third guide plate (24) and below the third guide plate (24) and are used for rotating and blowing air into the working tower (1).

7. The multi-stage temperature-controlled spray drying and agglomerating granulating device for milk powder according to claim 6, wherein one blowing part is a first blowing box (22), the first blowing box (22) is positioned in a main drying stage and between a second guide plate (23) and a first guide plate (21), and the other blowing part is a second blowing box (25) and is positioned in a cooling transition stage;

The first blowing box (22), the second blowing box (25) and the third blowing box (27) respectively comprise a box body and a box cover, the box body and the box cover are annular, a plurality of air outlet holes are formed in the box cover, and the box cover is fixed on the connecting rod (40) through the cross rod (29);

The box is set firmly on the inner wall of the working tower (1), and the outer side wall of the box is provided with a convex ring (30), and the inner side wall of the box cover is provided with a groove matched with the convex ring (30).

8. The multi-section temperature-controlled milk powder spray drying and agglomerating granulating device according to claim 7, wherein the heat exchange device comprises a blower (33), a conveying pipe II (34) and heat exchange boxes (35), wherein the blower (33) is positioned outside the working tower (1), the two heat exchange boxes (35) are arranged side by side and symmetrically and are semicircular, the heat exchange boxes (35) are arranged outside the working tower (1), and a plurality of heat exchange plates (36) are fixedly arranged in the heat exchange boxes (35);

the lower end of the second conveying pipe (34) is arranged on the blower (33), the upper end of the second conveying pipe (34) is provided with two air outlet channels, the two air outlet channels are respectively connected with the tops of the two heat exchange boxes (35), and the bottoms of the two heat exchange boxes (35) are respectively provided with a third conveying pipe (37);

the lower end of the conveying pipe III (37) on one side is connected with the blowing box II (25) in a conducting way, and the lower end of the conveying pipe III (37) on the other side is connected with the blowing box III (27) in a conducting way.

9. The multi-section temperature-controlled milk powder spray drying and agglomerating granulating device according to claim 4, wherein the driving piece comprises two bevel gears I (9) which are connected in a meshed manner, a sleeve (8) is arranged at the bottom of the bevel gear I (9) below, the lower end of the sleeve (8) penetrates through the top of the working tower (1) and is fixedly arranged at the top of the air blowing barrel (7), the other bevel gear I (9) is arranged at the output end of the driver (10), and the driver (10) is arranged at the top of the working tower (1) through screws;

The driving piece further comprises a bevel gear II (11), two bevel gears III (12) and a mounting rod (13), wherein the two bevel gears III (12) are coaxially and symmetrically arranged and fixedly arranged on the periphery of the mounting rod (13), the lower end of the mounting rod (13) is rotatably arranged in a deep groove in the air blowing barrel (7), the lower end of the mounting rod penetrates through the bevel gear I (9) and the sleeve (8) from top to bottom in sequence, and the rotating rod (14) is fixedly arranged on the periphery of the mounting rod (13);

The radius of the bevel gears II (11) and the bevel gears III (12) is smaller than that of the bevel gears I (9), the bevel gears II (11) are fixedly arranged on the upper position of the mounting rod (13), and the bevel gears III (12) are irregular bevel gears and are intermittently meshed with the bevel gears II (11).

10. A multi-stage temperature-controlled milk powder spray-drying and agglomerating granulation method, characterized in that the multi-stage temperature-controlled milk powder spray-drying and agglomerating granulation device applied to any one of claims 1 to 9 comprises the following steps:

S1, atomizing and spraying liquid milk from the top of the inside of a working tower (1), blowing hot air out from a blowing hole on a blowing cylinder (7), pre-drying fog drops, and guiding the pre-dried fog drops to a main trunk section through a first guide plate (21);

S2, driving a bevel gear III (12) to rotate by a driver (10) through a bevel gear I (9) while pre-drying;

S21, driving a blowing barrel (7) to rotate by a bevel gear I (9) below through a sleeve (8), and uniformly drying fog drops in a pre-drying section;

S22, intermittently connecting the third bevel gear (12) with the second upper bevel gear (11) and the second lower bevel gear (11) in a meshed manner, so that the mounting rod (13) rotates positively and negatively;

s221, in the forward rotation process, the rotary rod (14) drives the scraping plate (20) to horizontally move towards the position of the blowing cylinder (7) so as to slowly stir fog drops;

S222, when the device is reversed, the rotary rod (14) drives the scraping plate (20) to horizontally move towards the inner position of the working tower (1) to scrape milk powder fogdrops adhered on the inner wall;

S3, in the pre-drying process, hot air cooled by a cooling device (32) in the air inlet pipe II (31) is conveyed into the blowing box I (22) for main drying, and the milk powder after main drying slides down from the guide plate II (23) and is guided to a cooling transition section through the guide plate III (24);

S4, in the pre-drying process, the blowing cylinder (7) rotates, the cross rod (29) is driven to rotate through the connecting rod (40), and the box cover in the first blowing box (22) rotates to perform uniform air supply drying;

S5, simultaneously, the air blower (33) conveys cold air into the two heat exchange boxes (35) through the conveying pipe II (34), the hot air subjected to heat exchange is naturally cooled through the conveying pipes III (37) and is respectively conveyed to the air blowing boxes II (25) and III (27) to blow out, and the hot air blown out from the air blowing boxes II (25) cools and transits the dried milk powder;

S6, the completely dried milk powder falls into an agglomeration section, and an annular water pipe (38) sprays adhesive liquid drops to bond the milk powder, so that the bonded milk powder falls into a low-temperature curing section through a guide plate IV (26);

and S7, uniformly blowing, cooling and solidifying the agglomerated milk powder particles by hot air in the third blowing box (27), and when the agglomerated milk powder particles fall, driving the stirring rod (28) to rotate by the connecting rod (40) so as to stir the milk powder particles.