A low-temperature spray drying device

Abstract

The present invention relates to a low-temperature spray drying device, belonging to the technical field of spray dryers. The low-temperature spray drying device includes a fixing frame and a drying tank fixedly connected inside the fixing frame. A tank cover is installed on the top of the drying tank. A gas treatment mechanism and a finished product collection mechanism are installed on the outer surface of the fixing frame. It further includes: a wall scraping mechanism; a gas guiding mechanism; a filter screen; a crushing mechanism; a conveying mechanism. Through the arrangement of the scraper, the present invention enables the scraper to scrape off the atomized materials adhering to the inner wall of the drying tank and the granular materials adhering to the inner wall of the drying tank that are not dried, avoiding the adhesion of materials on the inner wall of the drying tank, resulting in the aggregation of materials, affecting the particle size of the produced finished product, and causing the particle size of the produced finished product to not meet the requirements. Furthermore, it ensures that the particle size of the produced granular materials meets the requirements and that the moisture content of the produced granular materials meets the production requirements.

Description

Technical Field

[0001] The present invention belongs to the technical field of spray dryers, and particularly relates to a low-temperature spray drying device. Background Art

[0002] A low-temperature spray dryer is an efficient drying equipment that combines low-temperature drying technology. Its characteristic lies in being able to quickly dry materials in a low-temperature environment, especially suitable for heat-sensitive materials; the low-temperature spray dryer realizes drying through the following steps: atomization process: the liquid material is dispersed into tiny droplets by an atomizer to increase the contact area with hot air; environment: a clean drying environment; low-temperature drying: under low-temperature conditions, the water in the droplets quickly evaporates, and the material directly transforms from a liquid state into a powdery or granular finished product.

[0003] When the low-temperature dryer is in use, when the liquid material enters the low-temperature dryer, due to the excessive water content of the product, when the ejected hot air flow cannot be evenly distributed in the low-temperature dryer, it will cause the liquid material to not be completely dried, resulting in the ejected liquid material adhering to the inner wall of the low-temperature dryer. And the liquid material adhering to the inner wall of the low-temperature dryer will cause the dried powdery or granular materials to gradually accumulate. After excessive accumulation, it will enter the finished product tank along with the finished product materials, resulting in the particle size of the produced powdery or granular materials not meeting the requirements, and the liquid material adhering to the inner wall of the low-temperature dryer will cause the moisture content of the produced materials not to meet the requirements. Based on this, a low-temperature spray drying device is proposed. Summary of the Invention

[0004] The purpose of the present invention is to provide a low-temperature spray drying device with a simple structure and reasonable design in order to solve the above problems.

[0005] The present invention realizes the above purpose through the following technical solutions:

[0006] A low-temperature spray drying device includes a fixing frame and a drying tank fixedly connected inside the fixing frame. A tank cover is installed on the top of the drying tank. A gas treatment mechanism and a finished product collection mechanism are installed on the outer surface of the fixing frame. It further includes:

[0007] A scraping mechanism fixedly connected inside the drying tank for scraping the inner wall of the drying tank. The scraping mechanism includes a scraping plate that fits the inner wall of the drying tank and a rotating sleeve. The scraping plate moves in a circular motion along the inner surface of the drying tank. A connecting rod is fixedly communicated with the side wall of the rotating sleeve. The scraping plate is fixedly connected to the side wall of the vertical part of the connecting rod;

[0008] An air guiding mechanism installed on a scraping wall mechanism, the air guiding mechanism includes an air pump fixedly communicated with a rotating sleeve, the air suction end of the air pump is fixedly connected with a fixed pipe, the side wall of the fixed pipe is fixedly communicated with an air suction pipe, and the top of the air suction pipe is fixedly connected with a partition net cover;

[0009] A filter screen fixedly connected inside the drying tank;

[0010] A crushing mechanism installed in the middle of the filter screen for crushing materials;

[0011] A conveying mechanism installed at the bottom of the crushing mechanism.

[0012] As a further optimized solution of the present invention, the scraping wall mechanism further includes a mounting frame fixedly connected to the inner wall of the drying tank, the bottom of the mounting frame is fixedly connected with a protective sleeve, a double-shaft motor is installed inside the protective sleeve, the top output end of the double-shaft motor is fixedly connected with a rotating shaft, the top of the rotating shaft is fixedly connected with the inner surface of the rotating sleeve, and the bottom of the connecting rod is fixedly connected with an upper wedge block.

[0013] As a further optimized solution of the present invention, the rotating shaft penetrates through the mounting frame and is rotatably connected with the mounting frame.

[0014] As a further optimized solution of the present invention, a partition board is fixedly connected to the side wall of the scraper, the partition board is fixedly connected with the connecting rod, an air injection pipe is fixedly communicated with the side wall of the connecting rod, and the air injection end of the air injection pipe is fixedly connected with the partition board.

[0015] As a further optimized solution of the present invention, the air guiding mechanism further includes a connecting ring sealingly and rotatably connected to the bottom of the rotating sleeve, the bottom of the connecting ring is fixedly communicated with an injection pipe, the bottom of the protective sleeve is fixedly connected with a blowing pipe, and the injection pipe is fixedly communicated with the blowing pipe.

[0016] As a further optimized solution of the present invention, the crushing mechanism includes a rotating rod fixedly connected to the bottom output end of the double-shaft motor, the rotating rod penetrates through the filter screen and is rotatably connected with the filter screen, a mounting plate is fixedly connected to the outer surface of the rotating rod, a crushing frame is fixedly connected to the bottom of the mounting plate, the crushing frame is directly below the blowing pipe, and a spline shaft is fixedly connected to the bottom of the rotating rod.

[0017] As a further optimized solution of the present invention, the conveying mechanism includes a connecting frame penetrating through the filter screen and slidingly connected with the filter screen, the end of the connecting frame is fixedly connected with a lower wedge block, the lower wedge block is adapted to the upper wedge block, a return spring is fixedly connected to the top of the connecting frame, and the return spring is sleeved on the outer surface of the rotating rod. The bottom of the connecting frame is rotatably connected with a spline sleeve, the bottom of the spline sleeve is fixedly connected with a connecting shaft, and the bottom of the connecting shaft is fixedly connected with a conveying roller.

[0018] As a further optimized solution of the present invention, the outer surface of the spline shaft fits with the inner surface of the spline sleeve and the two are adapted to each other. The top of the return spring is fixedly connected to the bottom of the filter screen, and the spline shaft penetrates through the connecting frame.

[0019] As a further optimized solution of the present invention, the gas treatment mechanism includes a heating box fixedly connected to the outer surface of the fixed frame. The top of the heating box is fixedly communicated with a purification box, and the purification box is fixedly connected to the outer surface of the fixed frame. The top of the purification box is fixedly communicated with a hot air pipe, and the hot air pipe is fixedly connected to the tank cover. An atomizing nozzle is installed on the hot air pipe, and the spraying end of the atomizing nozzle is located inside the drying tank. A cleaning nozzle is installed on the tank cover, and a vibration motor is installed on the outer surface of the drying tank.

[0020] As a further optimized solution of the present invention, the finished product collection mechanism includes a recovery pipe fixedly connected to the bottom of the drying tank. A cyclone dust collector is fixedly connected to the outer surface of the fixed frame, and the cyclone dust collector is fixedly communicated with the recovery pipe. A bag filter is fixedly connected to the outer surface of the fixed frame, and the bag filter is fixedly communicated with the cyclone dust collector. A finished product tank is installed at the bottom of the cyclone dust collector. A fan is installed on the fixed frame, and the air inlet end of the fan is fixedly communicated with the bag filter through a connecting pipe. The air outlet end of the fan is fixedly communicated with a filter box through an exhaust pipe, and the filter box is fixedly connected to the outer surface of the fixed frame. A controller is installed on the fixed frame.

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

[0022] 1. Through the arrangement of the scraper, the present invention enables the scraper to scrape off the atomized materials adhering to the inner wall of the drying tank and the granular materials adhering to the inner wall of the drying tank that are not dried, avoiding the adhesion of materials to the inner wall of the drying tank, resulting in the aggregation of materials, affecting the particle size of the produced finished products, and causing the particle size of the produced finished products to not meet the requirements. Furthermore, it ensures that the particle size of the produced granular materials meets the requirements and that the moisture content of the produced granular materials meets the production requirements.

[0023] 2. By providing the air guiding mechanism, the present invention enables the hot air flow guided by the air guiding mechanism to enter the drying tank, making the distribution of the hot air flow more uniform, ensuring the quality and efficiency of drying the atomized material. Moreover, the air flow guided by the air guiding mechanism will be ejected through the air injection pipe, acting on the material scraped by the scraper, blowing the material towards the middle of the drying tank to remove the moisture in the material and ensure the dryness of the material. Since the hot air blown out by the air injection pipe is directed towards the scraper, and the scraper is in contact with the inner wall of the drying tank, and with the long-term drying of the atomized material, the temperature in the lower part of the drying tank will be lower than that at the top. The hot air blown out through the air injection pipe can heat the area near the inner wall of the drying tank, making the temperature in the lower part of the drying tank close to that at the top, thereby ensuring the uniformity of the temperature inside the drying tank and further improving the drying quality and efficiency of the atomized material.

[0024] 3. Through the combined use of the upper wedge block, the crushing mechanism and the conveying mechanism in the present invention, the operation of the dual-axis motor will drive the rotating rod to rotate, and then drive the crushing frame to rotate through the mounting plate, enabling the crushing frame to crush the materials gathered together to obtain granular materials with particle sizes meeting the requirements. During this process, the upper wedge block will intermittently align with the conveying mechanism, causing the conveying mechanism to move up and down intermittently. As a result, the conveying roller moves up and down while rotating, realizing the conveyance of the granular materials, which can avoid the blockage of the granular materials caused by the accumulation of the granular materials and ensure the smooth discharge of the granular materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is the overall front three-dimensional structure schematic diagram of the present invention;

[0026] Figure 2 is the overall side three-dimensional structure schematic diagram of the present invention;

[0027] Figure 3 is the three-dimensional structure schematic diagram of the middle part of the drying tank of the present invention cut open;

[0028] Figure 4 is of the present invention Figure 3 enlarged structure schematic diagram at position A;

[0029] Figure 5 is of the present invention Figure 3 enlarged structure schematic diagram at position B;

[0030] Figure 6 is the front three-dimensional structure schematic diagram of the drying tank of the present invention partially cut open;

[0031] Figure 7 is of the present invention Figure 6 enlarged structure schematic diagram at position C;

[0032] Figure 8 It is a schematic diagram of the three-dimensional partial cross-sectional side elevation structure of the drying tank of the present invention;

[0033] Figure 9 It is a schematic diagram of the three-dimensional partial cross-sectional structure of the scraping mechanism, air guiding mechanism and conveying mechanism of the present invention;

[0034] Figure 10 It is of the present invention Figure 9 Schematic diagram of the enlarged structure at D in;

[0035] Figure 11 It is of the present invention Figure 9 Schematic diagram of the enlarged structure at E in.

[0036] In the figure: 1. Fixed frame; 2. Heating box; 3. Purification box; 4. Hot air pipe; 5. Drying tank; 6. Atomizing nozzle; 7. Cleaning nozzle; 8. Tank cover; 9. Recovery pipe; 10. Cyclone dust collector; 11. Bag dust collector; 12. Connecting pipe; 13. Fan; 14. Exhaust pipe; 15. Filter box; 16. Finished product tank; 17. Controller; 18. Vibration motor; 19. Scraping mechanism; 191. Mounting frame; 192. Protective sleeve; 193. Biaxial motor; 194. Rotating shaft; 195. Rotating sleeve; 196. Connecting rod; 197. Upper wedge block; 198. Scraper; 199. Partition board; 20. Air guiding mechanism; 201. Air pump; 202. Fixed pipe; 203. Air extraction pipe; 204. Partition net cover; 205. Connecting ring; 206. Injection pipe; 207. Blowing pipe; 208. Jet pipe; 21. Filter screen; 22. Crushing mechanism; 221. Rotating rod; 222. Mounting plate; 223. Crushing frame; 224. Spline shaft; 23. Conveying mechanism; 231. Connecting frame; 232. Lower wedge block; 233. Return spring; 234. Spline sleeve; 235. Connecting shaft; 236. Conveying roller. Specific embodiments

[0037] The following further describes the present application in detail with reference to the accompanying drawings. It is necessary to point out here that the following specific embodiments are only used to further illustrate the present application and cannot be understood as limiting the protection scope of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application according to the above application content.

[0038] Example 1 As Figure 1 , Figure 2 , Figure 3 , Figure 6 , Figure 7 and Figure 8As shown in the figure, a low-temperature spray drying device includes a fixing frame 1 and a drying tank 5 fixedly connected inside the fixing frame 1. A vibration motor 18 is installed on the outer surface of the drying tank 5. A tank cover 8 is installed on the top of the drying tank 5. A gas treatment mechanism and a finished product collection mechanism are installed on the outer surface of the fixing frame 1. The gas treatment mechanism includes a heating box 2 fixedly connected to the outer surface of the fixing frame 1. A purification box 3 is fixedly communicated with the top of the heating box 2. The purification box 3 is fixedly connected to the outer surface of the fixing frame 1. A hot air pipe 4 is fixedly communicated with the top of the purification box 3. The hot air pipe 4 is fixedly connected to the tank cover 8. An atomizing nozzle 6 is installed on the hot air pipe 4. The atomizing nozzle 6 is fixedly communicated with a material box (both the material box and the motor are prior arts, not shown in the figure and not described in detail). The spraying end of the atomizing nozzle 6 is located inside the drying tank 5. A cleaning nozzle 7 is installed on the tank cover 8. The cleaning nozzle 7 is fixedly communicated with an external clean water source (the clean water source is a prior art, not shown in the figure and not described in detail). The finished product collection mechanism includes a recovery pipe 9 fixedly connected to the bottom of the drying tank 5. A cyclone dust collector 10 is fixedly connected to the outer surface of the fixing frame 1. The cyclone dust collector 10 is fixedly communicated with the recovery pipe 9. A bag filter 11 is fixedly connected to the outer surface of the fixing frame 1. The bag filter 11 is fixedly communicated with the cyclone dust collector 10. A finished product tank 16 is installed at the bottom of the cyclone dust collector 10. A fan 13 is installed on the fixing frame 1. The intake end of the fan 13 is fixedly communicated with the bag filter 11 through a connecting pipe 12. The exhaust end of the fan 13 is fixedly communicated with a filter box 15 through an exhaust pipe 14. The filter box 15 is fixedly connected to the outer surface of the fixing frame 1. A controller 17 is installed on the fixing frame 1. The controller 17 is electrically connected to the fan 13, the vibration motor 18, the cyclone dust collector 10, the heating box 2 and the purification box 3, and the controller 17 is used to control the fan 13, the vibration motor 18, the cyclone dust collector 10, the heating box 2 and the purification box 3.

[0039] In use, connect the atomizing nozzle 6 to the material tank, then start the heating tank 2 and the purification tank 3 and start the fan 13, so that the outside air is heated by the heating tank 2 and then enters the hot gas pipe 4 after being purified by the purification tank 3 (it should be noted that the low temperature of this low-temperature spray drying device is not lower than room temperature or at a sub-zero temperature, but lower than the high temperature required during the drying of the existing high-temperature spray drying machine, that is, the low temperature of this low-temperature spray drying device, and its actual temperature is still relatively high), preheat the drying tank 5, and when the required "low temperature" is reached, start the atomizing nozzle 6 at this time so that the atomizing nozzle 6 atomizes the liquid material and sprays it into the drying tank 5. The atomized liquid material sprayed into the drying tank 5 is dried under the action of the "low temperature" gas to obtain granular material. The granular material enters the cyclone dust collector 10 through the recovery pipe 9. During this process, the vibration motor 18 is used to vibrate the lower part of the drying tank 5 to promote the discharge of the granular material, purify the granular material, so that the clean granular material enters the finished product tank 16. The gas generated by purifying the granular material will enter the bag dust collector 11 and be purified by the bag dust collector 11. The purified gas will enter the fan 13 through the connecting pipe 12 and then be discharged into the filter box 15 through the exhaust pipe 14 for filtration and then discharged into the external environment.

[0040] Such as Figure 3 , Figure 4 , Figure 6 , Figure 8 , Figure 9 and Figure 10As shown in the figure, the spray drying device further includes a scraping mechanism 19 fixedly connected inside the drying tank 5 for scraping the inner wall of the drying tank 5. The scraping mechanism 19 includes a scraper 198 that fits against the inner wall of the drying tank 5 and a rotating sleeve 195. The scraper 198 moves in a circular motion along the inner surface of the drying tank 5. A connecting rod 196 is fixedly connected to the side wall of the rotating sleeve 195. The scraper 198 is fixedly connected to the side wall of the vertical part of the connecting rod 196. A partition plate 199 is fixedly connected to the side wall of the scraper 198. The partition plate 199 is fixedly connected to the connecting rod 196. The partition plates 199 are arranged in multiple layers from bottom to top along the vertical side of the connecting rod 196. An air injection pipe 208 is fixedly connected to the side wall of the connecting rod 196. The air injection end of the air injection pipe 208 is fixedly connected to the partition plate 199. The air injection pipes 208 are arranged in multiple layers from bottom to top along the vertical side of the connecting rod 196, and the number of air injection pipes 208 is the same as that of the partition plates 199. The scraping mechanism 19 further includes a mounting bracket 191 fixedly connected to the inner wall of the drying tank 5. A protective sleeve 192 is fixedly connected to the bottom of the mounting bracket 191. A double-shaft motor 193 is installed inside the protective sleeve 192. The protective sleeve 192 is made of heat-insulating material to prevent heat accumulation from causing damage to the double-shaft motor 193 under the action of temperature. At the same time, it can prevent particulate materials from entering the inside of the double-shaft motor 193 and causing damage to the double-shaft motor 193. The top output end of the double-shaft motor 193 is fixedly connected to a rotating shaft 194. The rotating shaft 194 passes through the mounting bracket 191 and is rotatably connected to the mounting bracket 191. The top of the rotating shaft 194 is fixedly connected to the inner surface of the rotating sleeve 195.

[0041] Before starting to dry the material, start the double-shaft motor 193 so that the rotating shaft 194 drives the rotating sleeve 195 to rotate, thereby driving the connecting rod 196 and the scraper 198 fixedly connected to the side wall of the connecting rod 196 to rotate along the inner surface of the drying tank 5. As a result, the scraper 198 scrapes off the un-dried atomized material adhering to the inner wall of the drying tank 5 and the particulate material adhering to the inner wall of the drying tank 5, preventing the material from adhering to the inner wall of the drying tank 5 and aggregating, which affects the particle size of the produced finished product and causes the particle size of the produced finished product to not meet the requirements. Thus, it ensures that the particle size of the produced particulate material meets the requirements. At the same time, it prevents the excessive moisture of the un-dried atomized material adhering to the inner wall of the drying tank 5 from causing the growth of microorganisms and ensures that the moisture content of the produced particulate material meets the production requirements.

[0042] As Figure 3 、 Figure 4 、 Figure 6 、 Figure 8 、 Figure 9 and Figure 10As shown in the figure, the spray drying device further includes an air guiding mechanism 20 installed on the scraping mechanism 19. The air guiding mechanism 20 includes an air pump 201 fixedly communicated with the rotating sleeve 195. The air suction end of the air pump 201 is fixedly connected with a fixed pipe 202. A suction pipe 203 is fixedly communicated with the side wall of the fixed pipe 202. The top of the suction pipe 203 is fixedly connected with a partition net cover 204. The partition net cover 204 is provided to prevent materials from entering the fixed pipe 202.

[0043] When the atomizing nozzle 6 sprays atomized materials, start the air pump 201, so that the air pump 201 extracts the hot air flow in the upper layer of the drying tank 5 through the fixed pipe 202, so that the hot air flow injected into the drying tank 5 by the hot air pipe 4 can flow towards the edge part of the drying tank 5, ensuring the uniformity of the hot air flow in the drying tank 5, thus ensuring the uniformity of the internal temperature of the drying tank 5, and further ensuring the quality and efficiency of drying the atomized materials. The hot air flow extracted by the air pump 201 through the fixed pipe 202 will be injected into the rotating sleeve 195, then enter the connecting rod 196, and finally be sprayed out through the air spraying pipe 208, acting on the materials scraped off by the scraping plate 198, blowing the materials towards the middle of the drying tank 5, removing the moisture in the materials, ensuring the dryness of the materials, and because the hot air blown out by the air spraying pipe 208 is blown towards the scraping plate 198, and the scraping plate 198 is attached to the inner wall of the drying tank 5, and as the atomized materials are dried for a long time, the temperature below the drying tank 5 will be lower than the temperature at the top. The hot air blown out through the air spraying pipe 208 can heat the area near the inner wall of the drying tank 5, and at the same time make the temperature in the middle and lower parts of the drying tank 5 close to the temperature at the top, thus ensuring the uniformity of the internal temperature of the drying tank 5 and further improving the drying quality and drying efficiency of the atomized materials.

[0044] It should be noted that the specific working principle of the present invention based on Embodiment 1 is as follows:

[0045] During use, connect the atomizing nozzle 6 with the material box, then start the heating box 2 and the purification box 3 and start the fan 13, so that the outside air is heated by the heating box 2 and then purified by the purification box 3 and enters the hot air pipe 4 (it should be noted that the low temperature of this low-temperature spray drying device is not lower than room temperature or at a sub-zero temperature, but lower than the high temperature required during drying by the existing high-temperature spray drying machine, that is, the low temperature of this low-temperature spray drying device, and its actual temperature is still relatively high), preheat the drying tank 5, and after reaching the required "low temperature" and before starting to dry the materials, start the double-shaft motor 193, so that the rotating shaft 194 drives the rotating sleeve 195 to rotate, and then drives the connecting rod 196 and the scraping plate 198 fixedly connected to the side wall of the connecting rod 196 to rotate along the inner surface of the drying tank 5;

[0046] At this time, the atomizing nozzle 6 is started, so that the atomizing nozzle 6 atomizes the liquid material and sprays it into the drying tank 5. The atomized liquid material sprayed into the drying tank 5 is dried under the action of the "low-temperature" gas to obtain granular material. And during this process, the scraper 198 will scrape off the atomized material adhering to the inner wall of the drying tank 5 and the granular material adhering to the inner wall of the drying tank 5 that have not been dried, preventing the material from adhering to the inner wall of the drying tank 5, resulting in material aggregation, affecting the particle size of the produced finished product, and causing the particle size of the produced finished product to not meet the requirements. Furthermore, it ensures that the particle size of the produced granular material meets the requirements, avoids the growth of microorganisms caused by excessive moisture, and ensures that the moisture content of the produced granular material meets the production requirements;

[0047] And when the atomizing nozzle 6 sprays the atomized material, the air pump 201 is started, so that the air pump 201 extracts the hot air flow from the upper layer of the drying tank 5 through the fixed pipe 202, enabling the hot air flow injected into the drying tank 5 by the hot air pipe 4 to flow towards the edge part of the drying tank 5, ensuring the uniformity of the hot air flow in the drying tank 5, thereby ensuring the uniformity of the internal temperature of the drying tank 5, and further ensuring the quality and efficiency of drying the atomized material. The hot air flow extracted by the air pump 201 through the fixed pipe 202 will be injected into the rotating sleeve 195, then enter the connecting rod 196, and finally be sprayed out through the air spraying pipe 208, acting on the material scraped off by the scraper 198, blowing the material towards the middle of the drying tank 5, removing the moisture in the material, and ensuring the dryness of the material. And because the hot air blown out by the air spraying pipe 208 is blown towards the scraper 198, and the scraper 198 is in contact with the inner wall of the drying tank 5, and with the long-term drying of the atomized material, the temperature at the lower part of the drying tank 5 will be lower than that at the top. The hot air blown out through the air spraying pipe 208 can heat the vicinity of the inner wall of the drying tank 5, and at the same time make the temperature at the middle and lower parts of the drying tank 5 close to that at the top, thereby ensuring the uniformity of the internal temperature of the drying tank 5 and further improving the drying quality and drying efficiency of the atomized material;

[0048] The granular material obtained after drying the atomized material enters the cyclone dust collector 10 through the recovery pipe 9. During this process, the vibration motor 18 makes the lower part of the drying tank 5 vibrate, promoting the discharge of the granular material, purifying the granular material, enabling the clean granular material to enter the finished product tank 16. The gas generated by purifying the granular material will enter the bag filter 11, be purified by the bag filter 11, and the purified gas will enter the fan 13 through the connecting pipe 12, and then be discharged to the filter box 15 through the exhaust pipe 14 for filtration and then discharged to the external environment.

[0049] Example 2 As Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 、Figure 8 , Figure 9 and Figure 11 As shown in Figure 8 , Figure 9 and Figure 11 , the spray drying device further includes: a filter screen 21 fixedly connected inside the drying tank 5. The filter screen 21 is arranged such that the materials that fail to meet the drying requirements and accumulate fall on and adhere to the filter screen 21, increasing the residence time of the materials that fail to meet the drying requirements and accumulate, enabling the materials that fail to meet the drying requirements to be dried again. After being dried again, they will pass through or roll to the middle position of the filter screen 21; a crushing mechanism 22 installed in the middle of the filter screen 21 for crushing materials; the crushing mechanism 22 includes a rotating rod 221 fixedly connected to the bottom output end of the double-shaft motor 193. The rotating rod 221 passes through the filter screen 21 and is rotatably connected to the filter screen 21. A mounting plate 222 is fixedly connected to the outer surface of the rotating rod 221. A crushing frame 223 is fixedly connected to the bottom of the mounting plate 222. A spline shaft 224 is fixedly connected to the bottom of the rotating rod 221. The air guiding mechanism 20 further includes a connecting ring 205 sealingly and rotatably connected to the bottom of the rotating sleeve 195. An air injection pipe 206 is fixedly communicated with the bottom of the connecting ring 205. A blowing pipe 207 is fixedly connected to the bottom of the protective sleeve 192. The crushing frame 223 is directly below the blowing pipe 207. The air injection pipe 206 is fixedly communicated with the blowing pipe 207; it further includes: a conveying mechanism 23 installed at the bottom of the crushing mechanism 22. The conveying mechanism 23 includes a connecting frame 231 passing through the filter screen 21 and slidably connected to the filter screen 21. The spline shaft 224 passes through the connecting frame 231. A lower wedge block 232 is fixedly connected to the end of the connecting frame 231. The lower wedge block 232 is adapted to the upper wedge block 197. A return spring 233 is fixedly connected to the top of the connecting frame 231, and the return spring 233 is sleeved on the outer surface of the rotating rod 221. The top of the return spring 233 is fixedly connected to the bottom of the filter screen 21. A spline sleeve 234 is rotatably connected to the bottom of the connecting frame 231. The outer surface of the spline shaft 224 fits and is adapted to the inner surface of the spline sleeve 234. A connecting shaft 235 is fixedly connected to the bottom of the spline sleeve 234. A conveying roller 236 is fixedly connected to the bottom of the connecting shaft 235. The conveying roller 236 is arranged in a spiral form.

[0050] On the basis of Embodiment 1, the materials scraped off by the scraper 198 and the granular materials obtained by drying will fall downward onto the filter screen 21. At this time, the granular materials obtained by drying will pass through the filter screen 21 to reach the bottom of the drying tank 5, and the materials that have not met the drying requirements and have aggregated will fall on the filter screen 21 and adhere to the filter screen 21. The setting of the filter screen 21 will increase the residence time of the aggregated materials that have not met the drying requirements, enabling the materials that have not met the drying requirements to be dried again. With the setting of the vibration motor 18, the aggregated materials after being dried again will pass through or roll to the middle position of the filter screen 21 under the action of the vibration force generated by the vibration motor 18. And during this process, due to the operation of the biaxial motor 193, the rotating rod 221 will be driven to rotate, and then the crushing frame 223 will be driven to rotate through the mounting plate 222, so that the crushing frame 223 crushes the aggregated materials to obtain granular materials with a particle size meeting the requirements. The granular materials with a particle size meeting the requirements will pass through the filter screen 21. At the same time, some of the hot air entering the rotating sleeve 195 will pass through the injection pipe 206 and enter the blowing pipe 207, and be blown by the blowing pipe 207 to the middle position of the filter screen 21, acting on the aggregated materials to realize the drying of the materials, ensuring that the moisture content of the materials meets the requirements. And during this process, the rotation of the rotating rod 221 will drive the connecting shaft 235 to rotate through the spline shaft 224 and the spline sleeve 234, and then the conveying roller 236 will rotate to convey the granular materials obtained by drying. At the same time, due to the rotation of the connecting rod 196, the upper wedge block 197 will be driven to rotate. When the upper wedge block 197 rotates to the position where the lower wedge block 232 is located, the upper wedge block 197 will push the lower wedge block 232 downward, and then push the connecting frame 231 downward to stretch the return spring 233. At this time, with the setting of the spline shaft 224 and the spline sleeve 234, the conveying roller 236 will move downward while rotating. And when the upper wedge block 197 disengages from the lower wedge block 232, the connecting frame 231 will move upward under the action of the return spring 233, and then the spline sleeve 234 will pull the conveying roller 236 to move upward while rotating through the connecting shaft 235, realizing the conveying of the granular materials. And by the conveying roller 236 moving up and down while rotating, it can avoid the blockage of the granular materials caused by the accumulation of the granular materials, ensuring the smooth discharge of the granular materials.

[0051] The above-described embodiments merely represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention.

Claims

1. A low-temperature spray drying device, comprising a fixing frame (1) and a drying tank (5) fixedly connected inside the fixing frame (1). A tank cover (8) is installed on the top of the drying tank (5). A gas treatment mechanism and a finished product collection mechanism are installed on the outer surface of the fixing frame (1), characterized in that, It also includes: A scraping mechanism (19) fixedly connected inside the drying tank (5) for scraping the inner wall of the drying tank (5). The scraping mechanism (19) includes a scraper (198) that fits against the inner wall of the drying tank (5) and a rotating sleeve (195). The scraper (198) moves in a circular motion along the inner surface of the drying tank (5). A connecting rod (196) is fixedly connected to the side wall of the rotating sleeve (195). The scraper (198) is fixedly connected to the side wall of the connecting rod (196). The scraping mechanism (19) also includes a mounting frame (191) fixedly connected to the inner wall of the drying tank (5). A protective sleeve (192) is fixedly connected to the bottom of the mounting frame (191). A dual-shaft motor (193) is installed inside the protective sleeve (192). The top output end of the dual-shaft motor (193) is fixedly connected to a rotating shaft (194). The top of the rotating shaft (194) is fixedly connected to the inner surface of the rotating sleeve (195); An air guiding mechanism (20) installed on the scraping mechanism (19). The air guiding mechanism (20) includes an air pump (201) fixedly connected to the rotating sleeve (195). The air suction end of the air pump (201) is fixedly connected to a fixed pipe (202). A suction pipe (203) is fixedly connected to the side wall of the fixed pipe (202). The top of the suction pipe (203) is fixedly connected to a partition net cover (204). A partition plate (199) is fixedly connected to the side wall of the scraper (198). The partition plate (199) is fixedly connected to the connecting rod (196). A jet pipe (208) is fixedly connected to the side wall of the connecting rod (196). The jet end of the jet pipe (208) is fixedly connected to the partition plate (199). The hot air flow extracted by the air pump (201) through the fixed pipe (202) is injected into the rotating sleeve (195), then enters the connecting rod (196), and finally is ejected through the jet pipe (208). The air guiding mechanism (20) also includes a connecting ring (205) sealingly and rotatably connected to the bottom of the rotating sleeve (195). An injection pipe (206) is fixedly connected to the bottom of the connecting ring (205). A blowing pipe (207) is fixedly connected to the bottom of the protective sleeve (192). The injection pipe (206) is fixedly connected to the blowing pipe (207); A filter screen (21) fixedly connected inside the drying tank (5); A crushing mechanism (22) installed in the middle of the filter screen (21) for crushing materials. The crushing mechanism (22) includes a rotating rod (221) fixedly connected to the bottom output end of the dual-shaft motor (193). The rotating rod (221) passes through the filter screen (21) and is rotatably connected to the filter screen (21). A mounting plate (222) is fixedly connected to the outer surface of the rotating rod (221). A crushing frame (223) is fixedly connected to the bottom of the mounting plate (222). The crushing frame (223) is directly below the blowing pipe (207). A spline shaft (224) is fixedly connected to the bottom of the rotating rod (221); A conveying mechanism (23) installed at the bottom of the crushing mechanism (22).

2. The low-temperature spray drying device according to claim 1, wherein: The rotating shaft (194) passes through the mounting frame (191) and is rotatably connected to the mounting frame (191).

3. The low-temperature spray drying device according to claim 1, characterized in that: The conveying mechanism (23) includes a connecting frame (231) that passes through the filter screen (21) and is slidably connected to the filter screen (21). A lower wedge block (232) is fixedly connected to the end of the connecting frame (231). An upper wedge block (197) is fixedly connected to the bottom of the connecting rod (196). The lower wedge block (232) is adapted to the upper wedge block (197). A return spring (233) is fixedly connected to the top of the connecting frame (231), and the return spring (233) is sleeved on the outer surface of the rotating rod (221). A spline sleeve (234) is rotatably connected to the bottom of the connecting frame (231). A connecting shaft (235) is fixedly connected to the bottom of the spline sleeve (234). A conveying roller (236) is fixedly connected to the bottom of the connecting shaft (235).

4. The low-temperature spray drying device according to claim 3, characterized in that: The outer surface of the spline shaft (224) fits and is adapted to the inner surface of the spline sleeve (234). The top of the return spring (233) is fixedly connected to the bottom of the filter screen (21). The spline shaft (224) passes through the connecting frame (231).

5. The low-temperature spray drying device according to claim 1, characterized in that: The gas treatment mechanism includes a heating box (2) fixedly connected to the outer surface of the fixed frame (1). A purification box (3) is fixedly communicated with the top of the heating box (2). The purification box (3) is fixedly connected to the outer surface of the fixed frame (1). A hot air pipe (4) is fixedly communicated with the top of the purification box (3). The hot air pipe (4) is fixedly connected to the tank lid (8). An atomizing nozzle (6) is installed on the hot air pipe (4). The spraying end of the atomizing nozzle (6) is located inside the drying tank (5). A cleaning nozzle (7) is installed on the tank lid (8). A vibration motor (18) is installed on the outer surface of the drying tank (5).

6. The low-temperature spray drying device according to claim 1, characterized in that: The finished product collection mechanism includes a recovery pipe (9) fixedly connected to the bottom of the drying tank (5). A cyclone dust collector (10) is fixedly connected to the outer surface of the fixed frame (1). The cyclone dust collector (10) is fixedly communicated with the recovery pipe (9). A bag filter (11) is fixedly connected to the outer surface of the fixed frame (1). The bag filter (11) is fixedly communicated with the cyclone dust collector (10). A finished product tank (16) is installed at the bottom of the cyclone dust collector (10). A fan (13) is installed on the fixed frame (1). The intake end of the fan (13) is fixedly communicated with the bag filter (11) through a connecting pipe (12). The exhaust end of the fan (13) is fixedly communicated with a filter box (15) through an exhaust pipe (14). The filter box (15) is fixedly connected to the outer surface of the fixed frame (1). A controller (17) is installed on the fixed frame (1).

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