Low-temperature spray drying device

Abstract

The invention relates to a low-temperature spray drying device, and belongs to the technical field of spray dryers, the low-temperature spray drying device comprises a fixing frame and a drying tank fixedly connected in the fixing frame, the top of the drying tank is provided with a tank cover, and the outer surface of the fixing frame is provided with a gas treatment mechanism and a finished product collection mechanism; the device further comprises a wall scraping mechanism. An air guide mechanism; a filter screen; a crushing mechanism; and a conveying mechanism. Through the arrangement of a scraper, the scraper can scrape off undried vaporous materials adhered to the inner wall of the drying tank and granular materials adhered to the inner wall of the drying tank, and the situation that the materials are adhered to the inner wall of the drying tank, consequently, the materials are gathered, the particle size of a produced finished product is affected, and the particle size of the produced finished product cannot meet the requirement is avoided; therefore, the particle size of the produced granular material meets the requirement, and the moisture content of the produced granular material meets the production requirement.

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 device 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 and when the hot air flow ejected 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 material to gradually accumulate. After excessive accumulation, it will enter the finished product tank along with the finished product material, resulting in the particle size of the produced powdery or granular material not meeting the requirements, and the liquid material adhering to the inner wall of the low-temperature dryer will cause the water content of the produced material 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: 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: 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 makes 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, and the scraping plate is fixedly connected to the side wall of the vertical part of the connecting rod; An air guiding mechanism installed on the scraping mechanism. The air guiding mechanism includes an air pump fixedly communicated with the rotating sleeve. The air suction end of the air pump is fixedly connected with a fixing pipe. An air suction pipe is fixedly communicated with the side wall of the fixing pipe, and a partition net cover is fixedly connected to the top of the air suction pipe; A filter screen fixedly connected inside the drying tank; A crushing mechanism installed in the middle of the filter screen for crushing materials; A conveying mechanism installed at the bottom of the crushing mechanism.

[0006] As a further optimized solution of the present invention, the scraping mechanism further includes a mounting bracket fixedly connected to the inner wall of the drying tank. A protective sleeve is fixedly connected to the bottom of the mounting bracket. A dual-shaft motor is installed inside the protective sleeve. The top output end of the dual-shaft motor is fixedly connected to a rotating shaft. The top of the rotating shaft is fixedly connected to the inner surface of the rotating sleeve. The bottom of the connecting rod is fixedly connected to an upper wedge block.

[0007] As a further optimized solution of the present invention, the rotating shaft penetrates through the mounting bracket and is rotatably connected to the mounting bracket.

[0008] As a further optimized solution of the present invention, a partition is fixedly connected to the side wall of the scraper. The partition is fixedly connected to the connecting rod. An air injection pipe is fixedly communicated with the side wall of the connecting rod. The air injection end of the air injection pipe is fixedly connected to the partition.

[0009] As a further optimized solution of the present invention, the air guiding mechanism further includes a connecting ring that is hermetically and rotatably connected to the bottom of the rotating sleeve. A gas injection pipe is fixedly communicated with the bottom of the connecting ring. A blowing pipe is fixedly connected to the bottom of the protective sleeve. The gas injection pipe is fixedly communicated with the blowing pipe.

[0010] 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 dual-shaft motor. The rotating rod penetrates through the filter screen and is rotatably connected to 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. A spline shaft is fixedly connected to the bottom of the rotating rod.

[0011] As a further optimized solution of the present invention, the conveying mechanism includes a connecting frame that penetrates through the filter screen and is slidably connected to the filter screen. A lower wedge block is fixedly connected to the end of the connecting frame. 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 is sleeved on the outer surface of the rotating rod. A spline sleeve is rotatably connected to the bottom of the connecting frame. A connecting shaft is fixedly connected to the bottom of the spline sleeve. A conveying roller is fixedly connected to the bottom of the connecting shaft.

[0012] As a further optimized solution of the present invention, the outer surface of the spline shaft fits and is adapted to the inner surface of the spline sleeve. The top of the return spring is fixedly connected to the bottom of the filter screen. The spline shaft penetrates through the connecting frame.

[0013] 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 fixing 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 fixing 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 lid. 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 lid, and a vibration motor is installed on the outer surface of the drying tank.

[0014] 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 fixing 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 fixing 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 fixing frame. The air inlet end of the fan is fixedly communicated with the bag filter through a connecting pipe, and the air outlet end of the fan is fixedly communicated with a filter box through an exhaust pipe. The filter box is fixedly connected to the outer surface of the fixing frame, and a controller is installed on the fixing frame.

[0015] The beneficial effects of the present invention are as follows: 1. Through the arrangement of the scraper in the present invention, the scraper can scrape off the atomized materials and granular materials adhering to the inner wall of the drying tank that have not been dried, preventing the materials from adhering to the inner wall of the drying tank, resulting in material aggregation, affecting the particle size of the produced finished product, and making the particle size of the produced finished product unable to meet the requirements. Thus, 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.

[0016] 2. Through the arrangement of the air guiding mechanism in the present invention, the air guiding mechanism guides the hot air flow entering the inside of the drying tank, making the hot air flow more evenly distributed, ensuring the quality and efficiency of drying the atomized materials. Moreover, the air flow guided by the air guiding mechanism will be ejected through the air spraying pipe and act on the materials scraped off by the scraper, blowing the materials towards the middle of the drying tank to remove the moisture in the materials and ensure the dryness of the materials. Since the hot air blown out by the air spraying pipe blows towards the scraper, and the scraper fits against the inner wall of the drying tank, and as the atomized materials are dried for a long time, the temperature in the lower part of the middle of the drying tank will be lower than that at the top. The hot air blown out by the air spraying pipe can heat the area near the inner wall of the drying tank, making the temperature in the lower part of the middle 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 materials.

[0017] 3. By the combined use of the upper wedge block, the crushing mechanism and the conveying mechanism, 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, so that the crushing frame crushes the materials gathered together to obtain granular materials with particle sizes meeting the requirements. And in 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 conveying of granular materials, which can avoid the blockage of granular materials caused by the accumulation of granular materials and ensure the smooth discharge of granular materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is the overall front three-dimensional structure schematic diagram of the present invention; Figure 2 is the overall side three-dimensional structure schematic diagram of the present invention; Figure 3 is the three-dimensional structure schematic diagram of the middle part of the drying tank of the present invention cut open; Figure 4 is of the present invention Figure 3 amplified structure schematic diagram at A in; Figure 5 is of the present invention Figure 3 amplified structure schematic diagram at B in; Figure 6 is the front structure schematic diagram of the three-dimensional partial cut-open drying tank of the present invention; Figure 7 is of the present invention Figure 6 amplified structure schematic diagram at C in; Figure 8 is the side upward view structure schematic diagram of the three-dimensional partial cut-open drying tank of the present invention; Figure 9 is the three-dimensional partial cut-open structure schematic diagram of the scraping wall mechanism, the air guiding mechanism and the conveying mechanism of the present invention; Figure 10 is of the present invention Figure 9 amplified structure schematic diagram at D in; Figure 11 is of the present invention Figure 9 amplified structure schematic diagram at E in.

[0019] 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 lid; 9, recovery pipe; 10, cyclone dust collector; 11, bag filter; 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, double-shaft 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. Detailed implementation manners

[0020] The present application will be further described in detail below with reference to the accompanying drawings. It is necessary to point out here that the following specific implementation manners are only used to further illustrate the present application and cannot be understood as a limitation on the protection scope of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0021] 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.

[0022] In use, connect the atomizing nozzle 6 to 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 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. After reaching the required "low temperature", 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.

[0023] 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 communicated with 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 communicated with 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 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 double-shaft motor 193 is installed inside the protective sleeve 192. The protective sleeve 192 is made of heat-insulating material to avoid heat accumulation causing damage to the double-shaft motor 193 under the action of temperature, and at the same time 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 frame 191 and is rotatably connected to the mounting frame 191. The top of the rotating shaft 194 is fixedly connected to the inner surface of the rotating sleeve 195.

[0024] 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, and then drives 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, so that 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, avoiding the aggregation of materials adhering to the inner wall of the drying tank 5, 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. Furthermore, it ensures that the particle size of the produced particulate material meets the requirements, and at the same time avoids the excessive moisture of the un-dried atomized material adhering to the inner wall of the drying tank 5 causing the growth of microorganisms, and ensures that the moisture content of the produced particulate material meets the production requirements.

[0025] 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 gas guiding mechanism 20 installed on the scraping mechanism 19. The gas 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 setting of the partition net cover 204 prevents materials from entering the fixed pipe 202.

[0026] When the atomizing nozzle 6 sprays atomized materials, start the air pump 201, 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, so that the hot air flow injected into the drying tank 5 by the hot air pipe 4 can flow to 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 ejected through the air injection pipe 208, acting on the materials scraped off by the scraper 198, blowing the materials to the middle of the drying tank 5, removing the moisture in the materials, and ensuring the dryness of the materials. And because the hot air blown out by the air injection pipe 208 is blown towards the scraper 198, and the scraper 198 fits with the inner wall of the drying tank 5, and with the long-term drying of the atomized materials, the temperature at the lower part of the drying tank 5 will be lower than that at the top. And the hot air blown out by the air injection 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 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.

[0027] It should be noted that the specific working principle of the present invention based on Embodiment 1 is as follows: When in 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 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. 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 scraper 198 fixedly connected to the side wall of the connecting rod 196 to rotate along the inner surface of the drying tank 5; 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 by the "low-temperature" gas to obtain granular material. 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 has 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; 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 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 ejected through the air injection 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 injection 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 as the atomized material is dried for a long time, the temperature at the lower part of the drying tank 5 will be lower than the temperature at the top. The hot air blown out by the air injection pipe 208 can heat the area near the inner wall of the drying tank 5, and at the same time make the temperature of the middle and lower parts of the drying tank 5 close to the temperature 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; 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 vibrates 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 the bag dust collector 11 will purify it. The purified gas will enter the fan 13 through the connecting pipe 12, and then be discharged to the outside environment through the exhaust pipe 14 after being filtered in the filter box 15.

[0028] Example 2 As Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 andFigure 11 As shown, the spray drying device further includes: a filter screen 21 fixedly connected inside the drying tank 5. The filter screen 21 is provided 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 penetrates through the filter screen 21 and is rotatably connected to the filter screen 21. The outer surface of the rotating rod 221 is fixedly connected with a mounting plate 222. The bottom of the mounting plate 222 is fixedly connected with a crushing frame 223. The bottom of the rotating rod 221 is fixedly connected with a spline shaft 224. The air guiding mechanism 20 further includes a connecting ring 205 sealingly and rotatably connected to the bottom of the rotating sleeve 195. The bottom of the connecting ring 205 is fixedly communicated with an injection pipe 206. The bottom of the protective sleeve 192 is fixedly connected with a blowing pipe 207. The crushing frame 223 is directly below the blowing pipe 207. The 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 that penetrates through the filter screen 21 and is slidably connected to the filter screen 21. The spline shaft 224 penetrates through the connecting frame 231. The end of the connecting frame 231 is fixedly connected with a lower wedge block 232. The lower wedge block 232 is adapted to the upper wedge block 197. The top of the connecting frame 231 is fixedly connected with a return spring 233, 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 with the bottom of the filter screen 21. The bottom of the connecting frame 231 is rotatably connected with a spline sleeve 234. The outer surface of the spline shaft 224 fits and is adapted to the inner surface of the spline sleeve 234. The bottom of the spline sleeve 234 is fixedly connected with a connecting shaft 235. The bottom of the connecting shaft 235 is fixedly connected with a conveying roller 236. The conveying roller 236 is arranged in a spiral form.

[0029] On the basis of Embodiment 1, the materials scraped 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 double-shaft motor 193, the rotating rod 221 will be driven to rotate, and then the crushing frame 223 will be driven to rotate by 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, part of the hot air entering the rotating sleeve 195 will pass through the injection pipe 206 and enter the blowing pipe 207, and will 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, since the rotation of the connecting rod 196 will drive the upper wedge block 197 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, stretching the return spring 233. At this time, due to 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.

[0030] The above embodiments only 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 fixed frame (1) and a drying tank (5) fixedly connected to the fixed frame (1), a tank cover (8) being installed on the top of the drying tank (5), and a gas processing mechanism and a finished product collecting mechanism being installed on the outer surface of the fixed frame (1), characterized in that: Also includes: A scraping mechanism (19) fixedly connected to the drying tank (5) for scraping the inner wall of the drying tank (5), the scraping mechanism (19) comprising a scraper (198) in contact with the inner wall of the drying tank (5) and a rotating sleeve (195), the scraper (198) performing a circular motion along the inner surface of the drying tank (5), the side wall of the rotating sleeve (195) being fixedly connected to a connecting rod (196), and the scraper (198) being fixedly connected to the side wall of the connecting rod (196); an air guide mechanism (20) mounted on the wall scraping mechanism (19), the air guide mechanism (20) comprising an air pump (201) fixedly connected to the rotating sleeve (195), an air extraction end of the air pump (201) fixedly connected to a fixed pipe (202), a side wall of the fixed pipe (202) fixedly connected to an air extraction pipe (203), and a top of the air extraction pipe (203) fixedly connected to a screen cover (204); A filter screen (21) fixedly connected to the drying tank (5); A crushing mechanism (22) installed in the middle of the filter (21) for crushing materials; A conveying mechanism (23) is installed at the bottom of the crushing mechanism (22).

2. A low-temperature spray drying device according to claim 1, characterized in that: The wall scraping mechanism (19) further comprises 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-axis motor (193) is installed in the protective sleeve (192); a rotating shaft (194) is fixedly connected to the top output end of the dual-axis motor (193); the top of the rotating shaft (194) is fixedly connected to the inner surface of the rotating sleeve (195); and an upper wedge block (197) is fixedly connected to the bottom of the connecting rod (196).

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

4. A low-temperature spray drying device according to claim 1, characterized in that: The side wall of the scraper (198) is fixedly connected to a partition (199), the partition (199) is fixedly connected to a connecting rod (196), the side wall of the connecting rod (196) is fixedly connected to an air jet pipe (208), and the air jet end of the air jet pipe (208) is fixedly connected to the partition (199).

5. A low-temperature spray drying device according to claim 2, characterized in that: The air guide mechanism (20) further comprises a connecting ring (205) which is sealingly rotatably connected to the bottom of the rotating sleeve (195); the bottom of the connecting ring (205) is fixedly connected to an air injection pipe (206); the bottom of the protective sleeve (192) is fixedly connected to an air blowing pipe (207); the air injection pipe (206) is fixedly connected to the air blowing pipe (207).

6. A low-temperature spray drying device according to claim 5, characterized in that: The pulverizing mechanism (22) comprises a rotating rod (221) fixedly connected to the bottom output end of the dual-shaft motor (193); the rotating rod (221) penetrates 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 located directly below the air blowing pipe (207); and a spline shaft (224) is fixedly connected to the bottom of the rotating rod (221).

7. A low-temperature spray drying device according to claim 6, characterized in that: The conveying mechanism (23) comprises a connecting frame (231) that penetrates 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); the lower wedge block (232) is matched with 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); and a conveying roller (236) is fixedly connected to the bottom of the connecting shaft (235).

8. A low-temperature spray drying device according to claim 7, characterized in that: The outer surface of the spline shaft (224) is in contact with the inner surface of the spline sleeve (234), and the two are adapted to each other; the top of the return spring (233) is fixedly connected to the bottom of the filter screen (21); and the spline shaft (224) passes through the connecting frame (231).

9. A low-temperature spray drying device according to claim 1, characterized in that: The gas processing mechanism comprises a heating box (2) fixedly connected to the outer surface of a fixing frame (1); the top of the heating box (2) is fixedly connected to a purification box (3); the purification box (3) is fixedly connected to the outer surface of the fixing frame (1); the top of the purification box (3) is fixedly connected to a hot air pipe (4); the hot air pipe (4) is fixedly connected to a tank cover (8); an atomizing nozzle (6) is installed on the hot air pipe (4); the spray end of the atomizing nozzle (6) is located in a drying tank (5); a cleaning nozzle (7) is installed on the tank cover (8); and a vibration motor (18) is installed on the outer surface of the drying tank (5).

10. A low-temperature spray drying device according to claim 1, characterized in that: The finished product collection mechanism comprises 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 connected to the recovery pipe (9); a bag dust collector (11) is fixedly connected to the outer surface of the fixed frame (1); the bag dust collector (11) is fixedly connected to 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); an air inlet end of the fan (13) is fixedly connected to the bag dust collector (11) through a connecting pipe (12); an exhaust end of the fan (13) is fixedly connected to 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); and a controller (17) is installed on the fixed frame (1).

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