A multifunctional fluidized bed dryer for lactose powder production

Abstract

The present invention relates to the technical field of fluidized bed dryers, and discloses a multifunctional fluidized bed dryer for lactose powder production, comprising a shell, a material distribution mechanism arranged in the shell, the material distribution mechanism comprising a flexible metal fluidized plate, the flexible metal fluidized plate being arranged in the shell, dividing the inner cavity of the shell into a drying cavity and an air inlet cavity communicating with each other from top to bottom, an air distribution plate 1 being fixed in the middle of the bottom end of the flexible metal fluidized plate, both sides of the air distribution plate 1 being rotatably connected with air distribution plates 2 by a rotating shaft, the air distribution plates 2 being respectively fixed on both sides of the bottom end of the flexible metal fluidized plate, and a steel rope being arranged at the bottom end of the air distribution plate 1. The multifunctional fluidized bed dryer for lactose powder production is provided with a material distribution mechanism and an intermittent mechanism, and when the flexible metal fluidized plate changes from a first state to a second state, the lactose powder easily accumulated at the edge position can be gathered to the middle, and then the flexible metal fluidized plate can be controlled to return to the first state, so that the lactose powder gathered in the middle can be dispersed again.

Description

Technical Field

[0001] The invention relates to the technical field of fluidized bed dryers, in particular to a multifunctional fluidized bed dryer for producing lactose powder. Background Art

[0002] The multifunctional fluidized bed dryer integrates multiple functions. It can not only use hot air to contact the powder to evaporate the moisture in the powder quickly, but also has a cooling function. By introducing cold air, the powder can be quickly cooled down after drying to avoid the powder from deteriorating due to residual heat. In addition, it can also perform granulation operations. In the fluidized state, the liquid binder is mixed with the powder to agglomerate the powder to form particles, thereby improving the fluidity and formability of the powder. In the production of lactose powder, the pretreated lactose raw material enters the dryer, and hot air enters evenly from the bottom air inlet distribution plate to fluidize the lactose powder in the bed. The two are fully in contact to vaporize the moisture in the powder, and the moisture is discharged from the top outlet along with the hot air.

[0003] The existing publication number CN117329783A discloses a fluidized bed dryer and a fluidized bed drying system, wherein the fluidized bed dryer includes a box body and an air distribution plate, the inner cavity of the box body is divided into a fluidizing chamber and a wind chamber interconnected from top to bottom by the air distribution plate, a partition curtain for blocking a fire source is arranged in the fluidizing chamber, the partition curtain is connected to a lifting unit, the lifting unit is used to drive the partition curtain to move up and down between the top of the fluidizing chamber and the air distribution plate, an inert gas protection pipe and an emergency spray pipe are also arranged in the fluidizing chamber, the inert gas protection pipe is used to fill the fluidizing chamber with inert gas, the emergency spray pipe is used to spray water into the fluidizing chamber, and a pressure relief device is arranged on the box body, when the pressure in the fluidizing chamber reaches a preset pressure, the pressure relief device automatically opens to relieve pressure.

[0004] Although the above technical solution can prevent combustion and explosion in the fluidized chamber by cooperating with the partition curtain, the inert gas protection tube, the emergency spray pipe and the pressure relief device, and has the advantage of reducing safety hazards, in the prior art, when the fluidized bed dryer is used for drying lactose powder, the powder is prone to accumulation in dead zones, especially at the edge of the square fluidized bed. This is mainly because the hot air entering from the bottom of the air inlet distribution plate changes its air flow speed and direction when flowing to the edge area due to the obstruction of the bed wall, forming a local low-speed air flow zone. In these low-speed zones, the air The flow cannot provide enough power to keep the lactose powder in a fluidized state, resulting in the agglomerated powder easily accumulating here, thus forming a dead zone. When the lactose powder accumulates in the dead zone, it cannot participate in the normal drying cycle. Therefore, over time, it will gradually absorb moisture from the surrounding environment and become more humid, which will cause the powder to agglomerate. After the powder agglomerates, it will not only adhere to the wall of the fluidized bed, but also block the normal airflow channel, making it impossible for the hot air to be evenly distributed throughout the bed, resulting in a poor fluidization effect, further expanding the dead zone range, and greatly reducing the drying efficiency of the lactose powder. Summary of the invention

[0005] The object of the present invention is to provide a multifunctional fluidized bed dryer for the production of lactose powder, so as to solve the problem that when the fluidized bed dryer proposed in the above background technology is used for drying lactose powder, the powder is prone to moisture agglomeration and dead zone accumulation, resulting in poor fluidization effect.

[0006] The present invention provides a multifunctional fluidized bed dryer for lactose powder production, which adopts the following technical solution: A multifunctional fluidized bed dryer for lactose powder production, comprising a shell, a material distribution mechanism arranged in the shell, the material distribution mechanism comprising a flexible metal fluidizing plate, the flexible metal fluidizing plate being arranged in the shell, dividing the inner cavity of the shell into a drying cavity and an air inlet cavity communicating with each other from top to bottom, a first air distribution plate being fixed to the middle of the bottom end of the flexible metal fluidizing plate, both sides of the first air distribution plate being rotatably connected to second air distribution plates via a rotating shaft, the second air distribution plates being respectively fixed to both sides of the bottom end of the flexible metal fluidizing plate, and a steel rope being arranged at the bottom end of the first air distribution plate; In the first state, the flexible metal fluidizing plate is in a horizontal state as a whole, and the powder is distributed on the flexible metal fluidizing plate for fluidized drying. In the second state, the air distribution plate is moved down by pulling the steel rope, so that the air distribution plate 2 is flipped around the rotating shaft. At this time, the middle part of the flexible metal fluidizing plate is concave downward and the two sides are inclined, so that the powder at the edge of the flexible metal fluidizing plate is gathered to the middle part. Then the steel rope is loosened, the flexible metal fluidizing plate returns to the first state, and the powder is redistributed on the flexible metal fluidizing plate.

[0007] Furthermore, extension mechanisms are provided on both sides of the flexible metal fluidization plate, and the extension mechanisms include metal coils symmetrically fixed on both sides of the flexible metal fluidization plate and a winding shaft for winding the metal coils, both ends of the winding shaft pass through the shell and are fixed with circular blocks, and both ends of the winding shaft are provided with second torsion springs, and the two ends of the second torsion spring are respectively fixed on the circular block and the shell, and the shell is also provided with an opening for the metal coil to move.

[0008] Furthermore, an intermittent mechanism is provided in the housing, and the intermittent mechanism includes a shaft rotatably connected to the housing and a winding shaft fixed to the shaft, and one end of the steel rope away from the air distribution plate is fixed to the winding shaft and wound in the circumferential direction of the winding shaft, and both ends of the winding shaft are provided with a first torsion spring; One end of the shaft extends through the outside of the shell and is fixed with a driven gear. An incomplete gear is meshed on one side of the driven gear. The incomplete gear is rotatably connected to the outside of the shell through a driving shaft. The end of the driving shaft away from the shell is fixedly connected to a motor.

[0009] Furthermore, the flexible metal fluidization plate is provided with a scraping mechanism, and three groups of scraping mechanisms are distributed on the upper surface of the flexible metal fluidization plate, with one group each in the middle and on both sides of the front and rear edges, and each group of the scraping mechanisms includes a baffle fixed to the flexible metal fluidization plate, a connecting plate provided on the baffle, and a scraping blade fixed to the connecting plate, and the bottom end of the scraping blade is in sliding contact with the upper surface of the flexible metal fluidization plate; The baffle bar is provided with a plurality of limit grooves at equal intervals, and an insertion rod is movably inserted in the limit groove. One end of the insertion rod passes through the baffle bar and is fixed to the connecting plate, and a magnetic block 1 is fixed to the other end of the insertion rod. A spring is provided on the insertion rod, and the two ends of the spring are respectively abutted against the limit groove and the magnetic block 1.

[0010] Furthermore, track 1 and track 2 are provided at the front and rear positions of the inner wall of the shell, and the positions of track 1 and track 2 are consistent with the positions of the baffles on the flexible metal fluidization plate in the second state. Magnetic blocks 2 that are the same in number and correspond one to one with magnetic block 1 are fixed in track 1 and track 2 respectively, wherein magnetic block 1 and magnetic block 2 repel each other.

[0011] Furthermore, both ends of the rotating shaft are rotatably connected with sliders, and a sliding groove for the slider to slide up and down is provided in the shell.

[0012] Furthermore, an arc-shaped baffle is fixed in the shell, and the arc-shaped baffle is located on the overall outer side of the extension mechanism.

[0013] Furthermore, one end of the metal coil close to the flexible metal fluidizing plate is in sliding contact with a sliding wheel both above and below, and the sliding wheel is rotatably connected to the shell through an axis.

[0014] Furthermore, a base is symmetrically fixed to the four corners of the bottom end of the air distribution plate, and a rope buckle is rotatably connected to the base. There are two groups of steel ropes, and one end of each group of steel ropes away from the shaft rod is fixed to the corresponding two groups of rope buckles.

[0015] Furthermore, an air inlet is provided at the bottom end of the shell, an air outlet is provided at the top end of the shell, a feed hopper is provided at the top of one side of the shell, a discharge port is provided at the bottom of the other side of the shell, a vibrator is symmetrically installed outside the shell, and shock absorbers are symmetrically installed at the four corners of the bottom end of the shell.

[0016] Beneficial effects of the present invention: 1. By providing a material distribution mechanism and an intermittent mechanism, the state of the flexible metal fluidized plate can be changed periodically with the cooperation of the intermittent mechanism. When the flexible metal fluidized plate changes from the first state to the second state, the lactose powder easily accumulated at the edge position can be gathered to the middle part, and then the flexible metal fluidized plate is controlled to return to the first state, so that the lactose powder gathered in the middle part can be dispersed again and evenly distributed on the entire flexible metal fluidized plate, so that the powder that may have been insufficiently dried due to accumulation can be fully exposed to the hot air after redistribution, thereby improving the uniformity of the entire drying process and effectively ensuring the consistency of the drying quality of the lactose powder.

[0017] 2. By providing an extension mechanism, as the metal coil is unfolded, the effective area of ​​the flexible metal fluidizing plate increases, which can effectively prevent lactose powder from leaking from the left and right edges of the flexible metal fluidizing plate, ensure the integrity of the material during the fluidization process, and improve the yield of the product.

[0018] 3. By providing a scraping mechanism, when the flexible metal fluidizing plate changes from the first state to the second state, the scraping mechanism can timely scrape the powder adhering to the flexible metal fluidizing plate, reduce the formation of dead zones, ensure the uniform distribution of the powder on the flexible metal fluidizing plate, and further improve the fluidization effect of the powder. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a schematic diagram of the cross-sectional structure of the three-dimensional structure of the housing of the present invention; Figure 3 It is a three-dimensional structural schematic diagram of the material distributing mechanism, the intermittent mechanism, the extending mechanism and the material scraping mechanism of the present invention; Figure 4 It is a three-dimensional schematic diagram of the air distribution plate 1, the rotating shaft, the steel rope, the slider and the intermittent mechanism of the present invention; Figure 5 It is a schematic diagram of a side structural cross-section of the housing of the present invention; Figure 6 It is a bottom view schematic diagram of the three-dimensional structure of the flexible metal fluidizing plate, the first air distribution plate and the second air distribution plate of the present invention; Figure 7 It is a schematic diagram showing the cross-section of the three-dimensional structure of the flexible metal fluidizing plate of the present invention in the second state; Figure 8 It is a schematic diagram showing a front view of the cross-section of the structure of the flexible metal fluidizing plate of the present invention in the second state; Fig. 9 It is a schematic diagram showing a front view of the cross-section structure of the flexible metal fluidizing plate of the present invention in the first state; Fig.10 It is a schematic diagram of the three-dimensional structure of the flexible metal fluidizing plate and the extension mechanism of the present invention; Fig.11 It is an exploded schematic diagram of the three-dimensional structure of the extension mechanism of the present invention; Fig.12 It is a partial schematic diagram of the three-dimensional structure of the housing, opening, metal coil, reel, sliding wheel and axis of the present invention; Fig.13 It is a schematic diagram of the three-dimensional structure of the scraping mechanism of the present invention; Fig.14 It is a partial cross-sectional schematic diagram of the three-dimensional structure of the baffle bar, the connecting plate and the scraping blade of the present invention.

[0020] In the figure: 1. Shell; 111. Opening; 112. Arc baffle; 113. Track 1; 114. Track 2; 2. Air inlet; 3. Material distribution mechanism; 31. Flexible metal fluidization plate; 32. Air distribution plate 1; 321. Base; 322. Rope buckle; 33. Air distribution plate 2; 34. Rotating shaft; 35. Steel rope; 36. Sliding block; 37. Sliding groove; 4. Intermittent mechanism; 41. Shaft; 42. Winding reel; 43. First torsion spring; 44. Driven gear; 45. Incomplete gear; 46 , driving shaft; 47, motor; 48, cover; 5, extension mechanism; 51, metal coil; 511, sliding wheel; 512, axis; 52, reel; 53, circular stopper; 54, second torsion spring; 6, scraper mechanism; 61, stop bar; 62, connecting plate; 63, scraper blade; 64, limit groove; 65, plug rod; 66, magnetic block one; 67, spring; 68, magnetic block two; 7, air outlet; 8, feed hopper; 9, discharge port; 10, vibrator; 11, shock absorber. DETAILED DESCRIPTION

[0021] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0022] Reference Figure 1-Figure 2The present invention provides a multifunctional fluidized bed dryer for lactose powder production, comprising a shell 1, an air inlet 2 is provided at the bottom of the shell 1, an air outlet 7 is provided at the top of the shell 1, a feed hopper 8 is provided at the top of one side of the shell 1, a discharge port 9 is provided at the bottom of the other side of the shell 1, a vibrator 10 is symmetrically installed outside the shell 1, shock absorbers 11 are symmetrically installed at the four corners of the bottom of the shell 1, and a material distribution mechanism 3 is provided inside the shell 1; Specifically, refer to Figure 2-Figure 3 The material distribution mechanism 3 includes a flexible metal fluidizing plate 31, and the flexible metal fluidizing plate 31 is placed in the shell 1, dividing the inner cavity of the shell 1 into a drying chamber and an air inlet chamber which are connected to each other from top to bottom. The drying chamber is located above the flexible metal fluidizing plate 31, and the air inlet chamber is located below the flexible metal fluidizing plate 31. After the hot air enters the air inlet chamber from the air inlet 2, it enters the drying chamber through the flexible metal fluidizing plate 31, so that the lactose powder is in a fluidized state in the drying chamber. An air distribution plate 1 32 is fixed to the middle part of the bottom end of the flexible metal fluidizing plate 31, and both sides of the air distribution plate 1 32 are rotatably connected to air distribution plates 2 33 through a rotating shaft 34. The air distribution plates 2 33 are respectively fixed to both sides of the bottom end of the flexible metal fluidizing plate 31, and a steel rope 35 is provided at the bottom end of the air distribution plate 1 32.

[0023] The flexible metal fluidizing plate 31 has a first state and a second state. For details, refer to Figure 7-Figure 9 In the first state, the flexible metal fluidizing plate 31 is in a horizontal state as a whole. At this time, hot air passes through the air distribution plate 1 32 and the air distribution plate 2 33, and passes through the flexible metal fluidizing plate 31 into the drying chamber, and the powder enters the drying chamber through the feed hopper 8 and falls on the surface of the flexible metal fluidizing plate 31. At this time, the powder is distributed on the flexible metal fluidizing plate 31 for fluidized drying. In the second state, the air distribution plate 1 32 is moved downward by pulling the steel rope 35, so that the air distribution plate 2 33 is turned over with the rotating shaft 34 as the center. At this time, the middle part of the flexible metal fluidizing plate 31 is concave downward and the two sides are inclined, so that the powder at the edge of the flexible metal fluidizing plate 31 is gathered to the middle part. When the powder is gathered to the middle part, the steel rope 35 is released again, and the flexible metal fluidizing plate 31 returns to the first state, and the powder is redistributed on the flexible metal fluidizing plate 31, and fluidized drying continues.

[0024] Among them, refer to Figure 4 , Figure 8-Figure 9 Both ends of the rotating shaft 34 are rotatably connected with sliders 36, and a slide groove 37 for the slider 36 to slide up and down is opened in the shell 1. The rotating connection between the rotating shaft 34 and the slider 36 facilitates the flipping of the air distribution plate 2 33 around the rotating shaft 34. When the air distribution plate 1 32 moves downward under the pulling force of the steel rope 35, the slider 36 can slide in the slide groove 37, thereby ensuring the stable movement and flipping of the air distribution plates 1 32 and 2 33.

[0025] The distribution mechanism 3 changes the shape of the flexible metal fluidization plate 31 to gather the lactose powder that is easily accumulated at the edge to the middle, and then controls the flexible metal fluidization plate 31 to return to the first state, so that the lactose powder gathered in the middle can be dispersed again and evenly distributed on the entire flexible metal fluidization plate 31. By gathering and redispersing the powder accumulated at the edge, the powder is prevented from staying in the edge area for a long time to form dead zones and agglomerates. At the same time, the continuous uniform fluidization state also reduces the possibility of powder accumulation in other positions again, further solving the dead zone accumulation problem existing in the prior art.

[0026] Both sides of the flexible metal fluidizing plate 31 are provided with extension mechanisms 5. For details, refer to Figure 10-11 The extension mechanism 5 includes a metal coil 51 symmetrically fixed on both sides of the flexible metal fluidization plate 31 and a reel 52 for winding the metal coil 51. The metal coil 51 and the flexible metal fluidization plate 31 can be made of stainless steel or titanium alloy, but are not limited to the above materials. The side of the metal coil 51 away from the flexible metal fluidization plate 31 is fixed on the reel 52 and wound on the reel 52. The reel 52 is rotatably connected to the shell 1, and both ends of the reel 52 pass through the shell 1 and are fixed with circular blocks 53. Both ends of the reel 52 are provided with a second torsion spring 54, and the two ends of the second torsion spring 54 are respectively fixed on the circular block 53 and the shell 1. The shell 1 is also opened An opening 111 is provided for the metal coil 51 to move. When the flexible metal fluidizing plate 31 changes from the first state to the second state, under the action of tension, the metal coil 51 is unfolded from the reel 52 and moves toward the drying chamber along the opening 111 opened on the shell 1. In this process, the reel 52 rotates as the metal coil 51 is unfolded. The rotation of the reel 52 causes the second torsion spring 54 to twist and store elastic potential energy. As the metal coil 51 continues to unfold, the edge length of the flexible metal fluidizing plate 31 is increased, so that the effective area of ​​the flexible metal fluidizing plate 31 gradually increases, thereby preventing powder from leaking from the left and right edges of the flexible metal fluidizing plate 31.

[0027] Reference Figure 8-Figure 9 An arc-shaped baffle 112 is also fixed in the shell 1. The arc-shaped baffle 112 is located on the entire outer side of the extension mechanism 5. The arc-shaped baffle 112 is used to protect the entire extension mechanism 5 to prevent powder from entering and causing the winding shaft 52 to get stuck.

[0028] Reference Fig.12One end of the metal roll 51 close to the flexible metal fluidizing plate 31 is in sliding contact with a sliding wheel 511 at both ends. The sliding wheel 511 is rotatably connected to the shell 1 through an axis 512. The sliding wheel 511 is located at the upper and lower positions of the opening 111. When the metal roll 51 is unrolled from the winding shaft 52 and moves along the opening 111, the sliding wheel 511 can improve the smoothness of the movement process of the metal roll 51.

[0029] It should be noted that an intermittent mechanism 4 is provided in the housing 1. Figure 4-Figure 5 The intermittent mechanism 4 includes a shaft 41 rotatably connected to the shell 1 and a winding shaft 42 fixed to the shaft 41. The end of the steel rope 35 away from the air distribution plate 32 is fixed to the winding shaft 42 and is wound in the circumferential direction of the winding shaft 42. When the shaft 41 rotates, the winding shaft 42 will rotate with the shaft 41, and the winding shaft 42 will wind the steel rope 35. The steel rope 35 is pulled, thereby pulling the air distribution plate 32 downward. Both ends of the winding shaft 42 are provided with a first torsion spring 43, and the two ends of the first torsion spring 43 are respectively fixed to the shaft 41 and the shell 1. One end of the shaft 41 passes through the outside of the shell 1 and is fixed with a driven gear 44. An incomplete gear 45 is meshed on one side of the driven gear 44. 45 is rotatably connected to the outside of the shell 1 through a driving shaft 46, and a motor 47 is fixedly connected to one end of the driving shaft 46 away from the shell 1. When the steel rope 35 is wound around the reel 42, the first torsion spring 43 will twist and store elastic potential energy. When the toothless part of the incomplete gear 45 is opposite to the driven gear 44, the driven gear 44 stops rotating and the shaft 41 also stops rotating. The first torsion spring 43 releases the elastic potential energy and drives the reel 42 to rotate in the opposite direction, so that the steel rope 35 is loosened. At this time, the flexible metal fluidization plate 31 is reset under the action of the second torsion spring 54, and at the same time drives the air distribution plate 1 32 and the air distribution plate 2 33 to reset. At this time, the flexible metal fluidization plate 31 returns to the first horizontal state, and the powder is dispersed again.

[0030] A cover shell 48 is detachably mounted on the outside of the housing 1 by means of bolts, and the cover shell 48 covers the outside of the driven gear 44 , the incomplete gear 45 , the driving shaft 46 and the motor 47 .

[0031] Reference Figure 6 The four corners of the bottom end of the air distribution plate 32 are symmetrically fixed with bases 321, and each group of bases 321 is rotatably connected with a rope buckle 322. There are two groups of steel ropes 35, and one end of each group of steel ropes 35 away from the shaft 41 is respectively fixed to the corresponding two groups of rope buckles 322. By arranging bases 321 and rope buckles 322 at the four corners of the bottom end of the air distribution plate 32 and connecting the steel ropes 35, it can be ensured that the air distribution plate 32 can move down and up smoothly when subjected to the tension of the steel ropes 35, avoiding tilting or jamming.

[0032] The state of the flexible metal fluidizing plate 31 is changed by the intermittent mechanism 4, and the lactose powder that is easily accumulated at the edge is regularly gathered to the middle, so that the powder that was originally in the low-speed airflow area and easily accumulated to form a dead zone can re-participate in the fluidized drying process, effectively reducing the formation of dead zones and preventing the powder from accumulating on the edge for a long time and getting damp and agglomerated. At the same time, the powder is periodically gathered and dispersed on the flexible metal fluidizing plate 31, so that the hot air can contact the lactose powder more evenly. The powder that may have been insufficiently dried due to accumulation can be fully exposed to the hot air after redistribution, thereby improving the uniformity of the entire drying process and ensuring the consistency of the drying quality of the lactose powder.

[0033] Further, see Figure 2 , Figure 13-14 The flexible metal fluidizing plate 31 is provided with a scraper mechanism 6. Three groups of scraper mechanisms 6 are distributed on the upper surface of the flexible metal fluidizing plate 31. There is one group in the middle and on both sides of the front and rear edges. There is a gap between two adjacent groups of scraper mechanisms 6. Specifically, each group of scraper mechanisms 6 includes a baffle 61 fixed to the flexible metal fluidizing plate 31, a connecting plate 62 provided on the baffle 61, and a scraper blade 63 fixed to the connecting plate 62. The bottom end of the scraper blade 63 is in sliding contact with the upper surface of the flexible metal fluidizing plate 31. A plurality of limit grooves 64 are provided on the baffle bar 61 at equal intervals, and an insert rod 65 is movably inserted in the limit groove 64. One end of the insert rod 65 passes through the outside of the baffle bar 61 and is fixedly connected to the connecting plate 62. A magnetic block 66 is fixed to the other end of the insert rod 65. A spring 67 is provided on the insert rod 65, and the two ends of the spring 67 are respectively abutted against the limit groove 64 and the magnetic block 66. The flexible metal fluidization plate 31 is in the first state, and the scraper sheet 63 is in a relatively static state with the flexible metal fluidization plate 31 under the action of the spring 67.

[0034] Reference Fig. 9, the front and rear positions of the inner wall of the shell 1 are both provided with a track 1 113 and a track 2 114, the positions of the track 1 113 and the track 2 114 are consistent with the position of the baffle 61 on the flexible metal fluidization plate 31 in the second state, and the track 1 113 and the track 2 114 are respectively fixed with magnetic blocks 2 68 that are the same in number and correspond to the magnetic blocks 1 66, wherein the magnetic blocks 1 66 and the magnetic blocks 2 68 repel each other, and the magnetic blocks 1 66 and the magnetic blocks 2 68 have the same magnetic poles. When the flexible metal fluidization plate 31 changes from the first state to the second state, the baffle 61 moves with the flexible metal fluidization plate 31 to the position corresponding to the track 1 113 or the track 2 114, and the magnetic block 2 68 will produce a repulsive force on the magnetic block 1 66 , under the repulsive force of magnet block 2 68, magnet block 1 66 drives the insertion rod 65 to move in the limit groove 64 and compresses the spring 67. The movement of the insertion rod 65 causes the connecting plate 62 and the scraping piece 63 to slide along the upper surface of the flexible metal fluidization plate 31. During the sliding process, the lactose powder accumulated on the front and rear edges of the upper surface of the flexible metal fluidization plate 31 is scraped and gathered to the middle area to promote the redistribution of the powder. When the flexible metal fluidization plate 31 recovers from the second state to the first state, the baffle 61 leaves track 1 113 and track 2 114, and the repulsive force of magnet block 2 68 on magnet block 1 66 disappears. At this time, the spring 67 releases the elastic potential energy, so that the scraping piece 63 returns to the initial position.

[0035] During the drying process of lactose powder, some wet and agglomerated lactose powder will adhere to the front and rear edges of the flexible metal fluidization plate 31. The scraper mechanism 6 can scrape the adhered powder in time to reduce the formation of dead zones and ensure the uniform distribution of the powder on the flexible metal fluidization plate 31. The cooperation between the scraper mechanism 6 and the cloth mechanism 3 further improves the fluidization effect of the powder, allowing the hot air to contact the powder more fully, thereby improving the drying efficiency and drying quality.

[0036] A working principle of a multifunctional fluidized bed dryer for lactose powder production: During the lactose powder production process, the multifunctional fluidized bed dryer starts to work. First, the lactose powder to be dried enters the housing 1 of the dryer through the feed hopper 8 and falls on the surface of the flexible metal fluidizing plate 31. Hot air enters from the air inlet 2 at the bottom of the housing 1 and passes through the flexible metal fluidizing plate 31 into the drying chamber, so that the lactose powder is in a fluidized state in the drying chamber. At this time, the flexible metal fluidizing plate 31 is in a first state and is horizontal as a whole. The hot air passes through the air distribution plate 1 32 and the air distribution plate 2 33, and passes through the flexible metal fluidizing plate 31 to provide heat for powder drying. The powder falls on the surface of the flexible metal fluidizing plate 31 for fluidized drying. When the problem of edge powder accumulation needs to be solved, the motor 47 is started, and the motor 47 drives the driving shaft 46 to rotate. The incomplete gear 45 on the driving shaft 46 meshes with the driven gear 44, thereby driving the shaft 41 to rotate, and the winding shaft 42 on the shaft 41 rotates accordingly and winds the steel rope 35, and the steel rope 35 pulls the air distribution plate 1 32 downward, and the air distribution plate 2 33 flips around the rotating shaft 34. The sliders 36 at both ends of the rotating shaft 34 slide in the slide groove 37 to ensure stable movement. At this time, the flexible metal fluidization plate 31 changes to the second state along with the air distribution plates 1 32 and the air distribution plates 2 33, that is, the middle part of the flexible metal fluidization plate 31 is concave downward and the two sides are inclined, thereby The powder at the position gathers to the middle part. At the same time, in the process of the state change of the flexible metal fluidization plate 31, the metal coils 51 on both sides thereof are unfolded from the reel 52 under the action of tension, and move along the inner wall opening 111 of the shell 1 toward the drying chamber. The reel 52 rotates to make the second torsion spring 54 store elastic potential energy. When the toothless part of the incomplete gear 45 is opposite to the driven gear 44, the driven gear 44 stops rotating, and the shaft 41 also stops. The first torsion spring 43 releases elastic potential energy, driving the reel 42 to rotate in the opposite direction, and the steel rope 35 is loosened. At this time, the flexible metal fluidization plate 31 is reset under the action of the second torsion spring 54, returns to the first state, and the powder is re-dispersed. During the whole drying process, the vibrator 10 assists in the fluidization and transportation of the powder, reduces the accumulation of powder, and the shock absorber 11 reduces the vibration effect of the vibrator 10 when it is working. At the same time, when the flexible metal fluidization plate 31 changes from the first state to the second state, the scraper mechanism 6 starts to work, and the baffle 61 moves with the flexible metal fluidization plate 31 to the position corresponding to the track 1 113 and the track 2 114. The magnetic block 2 68 in the track generates a repulsive force on the magnetic block 1 66, so that the insertion rod 65 moves, compressing the spring 67, driving the armature 66 to move. The connecting plate 62 and the scraping piece 63 slide along the upper surface of the flexible metal fluidization plate 31, scraping the lactose powder accumulated on the front and rear edges of the upper surface of the flexible metal fluidization plate 31 and gathering them to the middle. When the flexible metal fluidization plate 31 returns to the first state, the baffle 61 leaves the track, the repulsive force of the magnetic block 2 68 on the magnetic block 1 66 disappears, the spring 67 releases the elastic potential energy, and the scraping piece 63 returns to the initial position. Finally, the lactose powder after drying is discharged from the discharge port 9, and the exhaust gas with water vapor is discharged from the air outlet 7.

[0037] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A multifunctional fluidized bed dryer for lactose powder production, comprising a housing, characterized in that: A material distribution mechanism is provided in the shell, and the material distribution mechanism includes a flexible metal fluidization plate, which is placed in the shell to divide the inner cavity of the shell into a drying cavity and an air inlet cavity which are connected to each other from top to bottom. An air distribution plate 1 is fixed to the middle of the bottom end of the flexible metal fluidization plate, and air distribution plates 2 are rotatably connected to both sides of the air distribution plate 1 through a rotating shaft. The air distribution plates 2 are respectively fixed to both sides of the bottom end of the flexible metal fluidization plate, and a steel rope is provided at the bottom end of the air distribution plate 1; In the first state, the flexible metal fluidizing plate is in a horizontal state as a whole, and the powder is distributed on the flexible metal fluidizing plate for fluidized drying. In the second state, the air distribution plate is moved down by pulling the steel rope, so that the air distribution plate 2 is flipped around the rotating shaft. At this time, the middle part of the flexible metal fluidizing plate is concave downward and the two sides are inclined, so that the powder at the edge of the flexible metal fluidizing plate is gathered to the middle part. Then the steel rope is loosened, the flexible metal fluidizing plate returns to the first state, and the powder is redistributed on the flexible metal fluidizing plate.

2. The multifunctional fluidized bed dryer for lactose powder production according to claim 1, characterized in that: Extension mechanisms are provided on both sides of the flexible metal fluidization plate, and the extension mechanisms include metal coils symmetrically fixed on both sides of the flexible metal fluidization plate and a winding shaft for winding the metal coils. Both ends of the winding shaft pass through the shell and are fixed with circular blocks. Both ends of the winding shaft are provided with second torsion springs, and the two ends of the second torsion spring are respectively fixed on the circular block and the shell. The shell is also provided with an opening for the metal coil to move.

3. The multifunctional fluidized bed dryer for lactose powder production according to claim 1, characterized in that: An intermittent mechanism is arranged in the shell, and the intermittent mechanism comprises a shaft rotatably connected to the shell and a winding shaft fixed on the shaft, one end of the steel rope away from the air distribution plate is fixed on the winding shaft and wound in the circumferential direction of the winding shaft, and first torsion springs are arranged at both ends of the winding shaft; One end of the shaft extends through the outside of the shell and is fixed with a driven gear. An incomplete gear is meshed on one side of the driven gear. The incomplete gear is rotatably connected to the outside of the shell through a driving shaft. The end of the driving shaft away from the shell is fixedly connected to a motor.

4. The multifunctional fluidized bed dryer for lactose powder production according to claim 1, characterized in that: The flexible metal fluidization plate is provided with a scraping mechanism, and three groups of scraping mechanisms are distributed on the upper surface of the flexible metal fluidization plate, with one group in the middle and on both sides of the front and rear edges, and each group of the scraping mechanisms includes a baffle fixed to the flexible metal fluidization plate, a connecting plate provided on the baffle, and a scraping blade fixed to the connecting plate, and the bottom end of the scraping blade is in sliding contact with the upper surface of the flexible metal fluidization plate; The baffle bar is provided with a plurality of limit grooves at equal intervals, and an insertion rod is movably inserted in the limit groove. One end of the insertion rod passes through the baffle bar and is fixed to the connecting plate, and a magnetic block 1 is fixed to the other end of the insertion rod. A spring is provided on the insertion rod, and the two ends of the spring are respectively abutted against the limit groove and the magnetic block 1.

5. The multifunctional fluidized bed dryer for lactose powder production according to claim 4, characterized in that: Track 1 and track 2 are provided at the front and rear positions of the inner wall of the shell, and the positions of track 1 and track 2 are consistent with the positions of the baffles on the flexible metal fluidization plate in the second state. Magnetic blocks 2 that are the same in number and correspond one to one with magnetic block 1 are fixed in track 1 and track 2 respectively, wherein magnetic block 1 and magnetic block 2 repel each other.

6. The multifunctional fluidized bed dryer for lactose powder production according to claim 1, characterized in that: Both ends of the rotating shaft are rotatably connected with sliders, and a sliding groove for the slider to slide up and down is provided in the shell.

7. The multifunctional fluidized bed dryer for lactose powder production according to claim 1, characterized in that: An arc-shaped baffle is also fixed in the shell, and the arc-shaped baffle is located on the overall outer side of the extension mechanism.

8. The multifunctional fluidized bed dryer for lactose powder production according to claim 2, characterized in that: One end of the metal coil plate close to the flexible metal fluidizing plate is in sliding contact with a sliding wheel at the top and bottom, and the sliding wheel is rotatably connected to the shell through the axis.

9. The multifunctional fluidized bed dryer for lactose powder production according to claim 1, characterized in that: A base is symmetrically fixed to the four corners of the bottom end of the air distribution plate, and a rope buckle is rotatably connected to the base. There are two groups of steel ropes in total, and one end of each group of steel ropes away from the shaft rod is fixed to the corresponding two groups of rope buckles.

10. The multifunctional fluidized bed dryer for lactose powder production according to claim 1, characterized in that: An air inlet is provided at the bottom of the shell, an air outlet is provided at the top of the shell, a feed hopper is provided at the top of one side of the shell, a discharge port is provided at the bottom of the other side of the shell, a vibrator is symmetrically installed outside the shell, and shock absorbers are symmetrically installed at the four corners of the bottom end of the shell.

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