Drying device for preparing calcium propionate through fermentation method

Abstract

The invention relates to the technical field of calcium propionate preparation, in particular to a drying device for preparing calcium propionate through a fermentation method, which comprises a drying tank, a return pipe is arranged at the bottom of the drying tank, a spraying assembly, a heat supply assembly and a transfer assembly are arranged in the drying tank, the transfer assembly comprises a lifting hopper and a stirring mechanism, and the stirring mechanism comprises a fixing rod, a rotating sleeve and a stirring arm. A spiral threaded groove is formed in the outer wall of the fixing rod, a transverse pin is fixedly arranged at the lower end of the rotating sleeve, one end of the transverse pin is inserted into the threaded groove, and a discharging valve is arranged at the small-caliber end of the lifting hopper and comprises an elastic valve used for blocking powder. The lower end of the drying tank is internally provided with an upper ejecting piece used for abutting against the elastic valve upwards to enable powder to fall down. During spray drying, the device temporarily stores powder through the lifting hopper, and the powder falling into the lifting hopper can be stirred by the stirring mechanism, so that the drying of wet powder is accelerated, and the drying efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of calcium propionate preparation, and in particular to a drying device for preparing calcium propionate by a fermentation method. Background Art

[0002] Calcium propionate is an acidic food preservative. Under acidic conditions, it produces free propionic acid and has antibacterial effects. Its antibacterial effect is affected by the pH value of the environment. The best inhibitory effect on mold is at a pH of 5.0. Calcium propionate has a strong inhibitory effect on various molds, Gram-negative rods or aerobic bacilli in acidic media, and can also inhibit the production of aflatoxin, while it is harmless to yeast, harmless to humans and animals, and has no toxic side effects. In summary, calcium propionate is a new, safe and efficient food and feed antifungal agent for food, brewing, feed, and traditional Chinese medicine preparations.

[0003] In the process of preparing calcium propionate by fermentation, the final product is usually dried by spray drying. Spray drying is a method in which liquid materials are sprayed into droplets through an atomizer and quickly dried into powder or granules in hot air. This method has the advantages of fast drying speed, good product uniformity, and high production efficiency. It is very suitable for the production of powder products such as calcium propionate.

[0004] The existing Chinese patent with publication number CN115445226B discloses a spray drying device for producing green weight loss powder, but the patent and traditional technology also have the following defects: First, after spray drying, the solid material particles obtained are very small, usually in powder form. Then, when the raw materials are dried in the centrifuge, some of the powder particles will adhere to the through holes on the centrifuge, and some of the powder particles may be thrown out of the centrifuge through the through holes on the centrifuge, which will lead to a reduction in the amount of raw materials. Secondly, the hot air shaft tube in the above patent has a plurality of air holes. When the atomizing nozzle sprays liquid material into the centrifugal cylinder, the liquid material may adhere to the air holes or fall into the hot air shaft tube through the air holes. Although the hot air shaft tube will spray hot air outward, there is a certain interval between adjacent air holes, which will cause part of the liquid material to dry into solid on the outer wall and inside the hot air shaft tube. Over time, more dry solids will adhere to the outer wall and inner wall of the hot air shaft tube, which will eventually affect the air outlet efficiency of the hot air shaft tube. Third, the lower end of the centrifuge cylinder gradually shrinks into a cone shape. After the liquid material is dried, the powder will fall into the material guide tube through the lower end of the centrifuge cylinder. In actual production, since the atomizing nozzle continues to spray material and the lower end of the centrifuge cylinder is narrower than the main body, a large amount of powder will accumulate at the lower end of the centrifuge cylinder. At this time, if the powder is not completely dried, the wet powder will block the lower end of the centrifuge cylinder, eventually making it difficult to discharge the material.

[0005] In order to solve the above problems, it is necessary to provide a drying device for preparing calcium propionate by fermentation. Summary of the invention

[0006] Based on this, it is necessary to provide a drying device for preparing calcium propionate by fermentation method in view of the existing technical problems.

[0007] In order to solve the problems of the prior art, the technical scheme adopted by the present invention is: a drying device for preparing calcium propionate by fermentation method, comprising a vertically arranged drying tank, a sealing cover plate is fixedly provided on the top of the drying tank, the lower end of the drying tank is gradually tapered, the top of the drying tank is a closed structure, a reflux pipe is provided at the bottom of the drying tank, a spray assembly, a heating assembly and a transfer assembly are arranged in the drying tank, the spray mechanism is arranged at the upper end of the drying tank, the heating assembly is arranged beside the spray assembly, the transfer assembly is arranged below the spray assembly, the transfer assembly comprises a lifting hopper and a stirring mechanism, the small-diameter end of the lifting hopper faces downward, and the stirring mechanism is arranged at In the lifting hopper, the stirring mechanism includes a fixed rod, a rotating sleeve and a stirring arm. The fixed rod is vertically fixed in the drying tank and passes through the lifting hopper. The rotating sleeve is coaxially sleeved outside the fixed rod, and the rotating sleeve is rotatably connected to the lifting hopper. A spiral ascending thread groove is provided on the outer wall of the fixed rod. A transverse pin is fixed on the lower end of the rotating sleeve, and one end of the transverse pin is inserted into the thread groove. The stirring arm is fixedly connected to the upper end of the rotating sleeve. A discharge valve is provided on the small-diameter end of the lifting hopper, and the discharge valve includes an elastic valve for blocking powder. An upper top piece is provided at the lower end of the drying tank for resisting the elastic valve upward to make the powder fall.

[0008] Furthermore, the discharge valve also includes a valve tube and a spring. The valve tube is vertical. The upper end of the valve tube is coaxially fixedly connected to the lower end of the lifting hopper. A sealing head is provided at the lower end of the valve tube. The outer wall of the lower end of the valve tube is provided with a plurality of blanking grooves evenly distributed along the circumferential direction of the valve tube. A sleeve extending vertically downward is formed on the outer wall of the upper end of the valve tube. An annular accommodating cavity is formed between the sleeve and the valve tube. The elastic valve is coaxially sleeved on the outer wall of the lower end of the valve tube in an annular shape. The upper end of the elastic valve extends into the annular accommodating cavity. The elastic valve The top of the door is coaxially formed with a convex ring that slides in the annular accommodating cavity, and two symmetrical support rods are formed on the convex ring. Two vertical sliding grooves are provided on the sleeve, and each support rod horizontally passes through the corresponding vertical sliding groove. The spring is vertically arranged in the annular accommodating cavity, and the two ends of the spring respectively conflict with the convex ring and the inner top wall of the annular accommodating cavity. A limiting ring is fixedly provided at the bottom of the sleeve, and the upper top piece includes two vertical rods corresponding to the support rods, and the lower end of each vertical rod is fixedly connected to the inner wall of the drying tank.

[0009] Furthermore, the sealing head includes a circular plate, a conical head and a fixed sleeve. The circular plate is coaxially fixed in the lower end of the valve tube, the conical head is coaxially formed at the top of the circular plate, and the small-diameter end of the conical head faces upward, and the fixed sleeve is coaxially formed at the bottom of the circular plate. A vertical columnar through groove is opened in the conical head, the rotating sleeve passes downward through the columnar through groove, and the outer wall of the rotating sleeve fits with the inner wall of the columnar through groove, a bearing is coaxially embedded in the fixed sleeve, the lower end of the rotating sleeve vertically passes through the bearing, and the lower end of the rotating sleeve is fixedly connected to the inner ring of the bearing, and the upper end of the rotating sleeve passes upward through the valve tube and extends into the lifting hopper.

[0010] Furthermore, a support is provided at the lower end of the drying tank, and a number of No. 1 connecting bars in a circular array are provided around the support. The support is fixedly connected to the inner wall of the drying tank through the number of No. 1 connecting bars, the upper end of the fixed rod is fixedly connected to the sealing cover plate, and the lower end of the fixed rod is fixedly connected to the support. The stirring arm includes a number of groups of rotating arms evenly distributed along the circumferential direction of the rotating sleeve, and each group of rotating arms includes a scraper bar and a number of connecting rods. The scraper bar is in an inclined state, and the scraper bar fits with the conical inner wall of the lifting hopper. Each connecting rod is horizontal, and the scraper bar is connected to the rotating sleeve through a number of connecting rods.

[0011] Furthermore, a scraper ring is provided at the outer edge of the upper end of the lifting hopper, the scraper ring is attached to the inner wall of the drying tank, and the scraper ring is coaxial with the lifting hopper. A number of No. 2 connecting strips evenly distributed along the circumferential direction of the lifting hopper are provided between the scraper ring and the lifting hopper, and the scraper ring is connected to the lifting hopper through a number of No. 2 connecting strips.

[0012] Furthermore, two groups of symmetrical driving mechanisms are provided on the sealing cover plate, each group of driving mechanisms includes a motor, a drum and a traction rope, and two groups of symmetrical brackets are formed on the outer wall of the upper end of the drying tank. Each motor is horizontally fixed on the corresponding bracket, and the drum rotates horizontally on the top of the sealing cover plate. The traction rope is wrapped around the drum, one end of the traction rope is fixedly connected to the drum, and the other end of the traction rope is vertically downward and fixedly connected to the top of the lifting hopper.

[0013] Furthermore, the spray assembly includes an annular tube No. 1, a feed pipe and a plurality of atomizing nozzles. The annular tube No. 1 is horizontally fixed to the bottom of the sealing cover plate, and the plurality of atomizing nozzles are evenly distributed along the circumferential direction of the annular tube No. 1. Each atomizing nozzle is connected to the annular tube No. 1. The feed pipe is vertically connected to the annular tube No. 1, and the feed pipe passes upward through the sealing cover plate and is extended outside the drying tank.

[0014] Furthermore, the heating assembly includes a No. 2 annular tube, an air intake pipe and a plurality of hot air nozzles. The No. 2 annular tube is horizontally fixed to the bottom of the sealing cover plate. The circumference of the No. 2 annular tube is larger than the circumference of the No. 1 annular tube. The No. 1 annular tube is located inside the No. 2 annular tube. The plurality of hot air nozzles are evenly distributed along the circumferential direction of the No. 2 annular tube. Each hot air nozzle is connected to the No. 2 annular tube. The air intake pipe is vertically connected to the No. 2 annular tube, and the air intake pipe passes through the sealing cover plate upward and extends out of the drying tank.

[0015] Compared with the prior art, the present invention has the following beneficial effects: First, during spray drying, the device temporarily stores the powder through the lifting hopper, and the powder falling into the lifting hopper will be stirred by the stirring mechanism, thereby accelerating the drying of the wet powder and improving the drying efficiency; Secondly, when the lifting hopper rises, the scraper ring at the upper end of the lifting hopper will scrape off the powder attached to the inner wall of the drying tank, thereby preventing a large amount of powder from adhering to the inner wall of the drying tank and causing the loss of the final finished product; Thirdly, when the lifting hopper of the device descends to near the upper top piece, the elastic valve is pushed up by the upper top piece to allow the powder in the lifting hopper to be discharged. Since the powder in the lifting hopper has been completely dried during the descending process of the lifting hopper, the powder discharged from the lifting hopper will not contain moisture, thereby preventing the wet powder from clogging the reflux pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional structural schematic diagram of the present application; Figure 2 is a top view of the present application; Figure 3 yes Figure 2 Section view along line AA; Figure 4 yes Figure 3 A1 is a partial enlarged schematic diagram; Figure 5 yes Figure 3 A2 is a partial enlarged schematic diagram; Figure 6 It is a top view of the drying tank; Figure 7 This is a schematic diagram of the three-dimensional structure of the transfer component. Figure 1 ; Figure 8 yes Figure 7 A3 is a partial enlarged schematic diagram; Fig. 9 This is a schematic diagram of the three-dimensional structure of the transfer component. Figure 2 ; Fig.10 It is a three-dimensional structural exploded diagram of the discharge valve.

[0017] The numbers in the figure are: 1, drying tank; 2, sealing cover plate; 3, reflux pipe; 4, lifting hopper; 5, fixing rod; 6, rotating sleeve; 7, threaded groove; 8, transverse pin; 9, elastic valve; 10, valve pipe; 11, spring; 12, blanking groove; 13, sleeve; 14, annular accommodating cavity; 15, convex ring; 16, support rod; 17, vertical slide groove; 18, limit ring; 19, vertical rod; 20, round plate; 21, cone shaped head; 22, fixed sleeve; 23, columnar through groove; 24, bearing; 25, bracket; 26, No. 1 connecting strip; 27, scraper strip; 28, connecting rod; 29, scraper ring; 30, No. 2 connecting strip; 31, motor; 32, roller; 33, traction rope; 34, bracket; 35, No. 1 annular tube; 36, feed pipe; 37, atomizing nozzle; 38, No. 2 annular tube; 39, air intake pipe; 40, hot air nozzle. DETAILED DESCRIPTION

[0018] In order to further understand the features, technical means, specific objectives and functions of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0019] refer to Figures 1 to 10 The drying device for preparing calcium propionate by fermentation method shown in the figure comprises a vertically arranged drying tank 1, a sealing cover plate 2 is fixedly provided on the top of the drying tank 1, the lower end of the drying tank 1 tapers to form a cone, the top of the drying tank 1 is a closed structure, a reflux pipe 3 is provided at the bottom of the drying tank 1, a spray assembly, a heating assembly and a transfer assembly are arranged in the drying tank 1, the spray mechanism is arranged at the upper end of the drying tank 1, the heating assembly is arranged beside the spray assembly, the transfer assembly is arranged below the spray assembly, the transfer assembly comprises a lifting hopper 4 and a stirring mechanism, the small-diameter end of the lifting hopper 4 faces downward, the stirring mechanism is arranged in the lifting hopper 4, and the stirring mechanism comprises a fixed Rod 5, rotating sleeve 6 and stirring arm, the fixed rod 5 is vertically fixed in the drying tank 1, and the fixed rod 5 passes through the lifting hopper 4, the rotating sleeve 6 is coaxially sleeved outside the fixed rod 5, and the rotating sleeve 6 is rotatably connected with the lifting hopper 4, a spirally ascending thread groove 7 is provided on the outer wall of the fixed rod 5, a transverse pin 8 is fixed on the lower end of the rotating sleeve 6, one end of the transverse pin 8 is inserted into the thread groove 7, the stirring arm is fixedly connected to the upper end of the rotating sleeve 6, a discharge valve is provided on the small-diameter end of the lifting hopper 4, the discharge valve includes an elastic valve 9 for blocking powder, and an upper top piece is provided in the lower end of the drying tank 1 for upwardly resisting the elastic valve 9 to make the powder fall.

[0020] After calcium propionate is prepared, a solution or suspension containing calcium propionate is fed into the spray assembly through a high-pressure pump, and the solution containing calcium propionate is turned into mist by the spray assembly and sprayed downward into the drying tank 1. At the same time, the heating assembly will continue to spray hot air into the drying tank 1. When the hot air contacts the mist droplets, the water in the mist droplets will be evaporated and eventually become powder particles. Before the spray assembly sprays into the drying tank 1, the lifting hopper 4 in the transfer assembly will be in an ascending state. At this time, the lifting hopper 4 is close to the spray assembly. When the spray assembly sprays, the mist droplets will fall into the lifting hopper 4, and the mist droplets will evaporate in the lifting hopper 4 to form powder. Since the spray assembly continues to spray downward, some subsequent mist droplets may adhere to the dried powder, so a stirring mechanism is needed to stir the powder in the lifting hopper 4 to prevent the wet powder from adhering to the lifting hopper 4. The specific working process of the stirring mechanism is as follows: the lifting hopper 4 is slowly reciprocated in the drying tank 1. When the lifting hopper 4 is lifted and lowered, the transverse pin 8 inserted in the thread groove 7 will slide along the thread groove 7. Through the action of the transverse pin 8, the rotating sleeve 6 will rotate during the lifting and lowering of the lifting hopper 4. Finally, the stirring arm is driven by the rotating sleeve 6 to stir the powder falling into the lifting hopper 4, so as to accelerate the drying of the wet powder and prevent the wet powder from adhering to the lifting hopper 4. After the lifting hopper 4 is lowered, the lifting hopper 4 will gradually move away from the spray assembly. At this time, the powder in the lifting hopper 4 will be completely dried during the descending process of the lifting hopper 4. At this time, since the lifting hopper 4 is far away from the spray assembly, the subsequent falling mist droplets will be evaporated before falling into the lifting hopper 4. Then, after the lifting hopper 4 is lowered a certain distance, only completely dry powder will fall into the lifting hopper 4. When the lifting hopper 4 is lowered to the point where the elastic valve 9 conflicts with the upper top piece, the elastic valve 9 rises. At this time, the powder in the lifting hopper 4 will fall into the lower end of the drying tank 1, and the powder that finally falls into the drying tank 1 will be discharged through the reflux pipe 3. In actual use, the reflux pipe 3 is connected to the downstream cyclone separator (not shown in the figure), and the hot air and powder in the drying tank 1 will enter the cyclone separator together, and the hot air and powder will be separated by the cyclone separator to finally obtain a separate powder.

[0021] In order to show the specific structure of the material valve, the following features are set: The discharge valve also includes a valve tube 10 and a spring 11. The valve tube 10 is vertical. The upper end of the valve tube 10 is coaxially fixedly connected to the lower end of the lifting hopper 4. The lower end of the valve tube 10 is provided with a sealing head. The outer wall of the lower end of the valve tube 10 is provided with a plurality of blanking grooves 12 (such as Fig.10As shown in the figure, a sleeve 13 extending vertically downward is formed on the outer wall of the upper end of the valve tube 10, and an annular accommodating chamber 14 is formed between the sleeve 13 and the valve tube 10. The elastic valve 9 is coaxially sleeved on the outer wall of the lower end of the valve tube 10 in an annular shape, and the upper end of the elastic valve 9 extends into the annular accommodating chamber 14. A convex ring 15 sliding in the annular accommodating chamber 14 is coaxially formed on the top of the elastic valve 9. Two symmetrical support rods 16 are formed on the convex ring 15. Two vertical slide grooves 17 are provided on the sleeve 13, and each support rod 16 passes horizontally through the corresponding vertical slide groove 17. The spring 11 is vertically arranged in the annular accommodating chamber 14, and the two ends of the spring 11 are respectively in conflict with the convex ring 15 and the inner top wall of the annular accommodating chamber 14. A limiting ring 18 (as shown in the figure) is fixedly provided at the bottom of the sleeve 13. Figure 8 As shown in the figure, the upper top member includes two vertical rods 19 corresponding to the support rods 16 respectively, and the lower end of each vertical rod 19 is fixedly connected to the inner wall of the drying tank 1.

[0022] In the initial state, the spring 11 releases its elastic force to resist the downward displacement of the convex ring 15, so that the elastic valve 9 will move downward, and finally the convex ring 15 will resist downward with the limit ring 18, at this time the elastic valve 9 will cover a plurality of blanking slots 12, so that the powder material falling into the valve tube 10 through the lifting hopper 4 will not be discharged, when the lifting hopper 4 drops to the point where the vertical rod 19 resists the support rod 16, the support rod 16 will be pushed up by the vertical rod 19, so that the elastic valve 9 will rise, and a plurality of blanking slots 12 will be exposed to the outside, and finally the powder material falling into the valve tube 10 will be discharged through a plurality of blanking slots 12, wherein the sealing head provided at the lower end of the valve tube 10 is used to prevent the powder material from being discharged from the lower end of the valve tube 10, to ensure that the powder material can only be discharged through the blanking slots 12.

[0023] In order to show how the rotating sleeve 6 is rotatably connected to the lifting hopper 4, the following features are provided: The sealing head includes a circular plate 20, a conical head 21 and a fixed sleeve 22. The circular plate 20 is coaxially fixed in the lower end of the valve tube 10. The conical head 21 is coaxially formed at the top of the circular plate 20, and the small-diameter end of the conical head 21 faces upward. The fixed sleeve 22 is coaxially formed at the bottom of the circular plate 20. A vertical columnar through groove 23 is opened in the conical head 21. The rotating sleeve 6 passes downward through the columnar through groove 23, and the outer wall of the rotating sleeve 6 fits with the inner wall of the columnar through groove 23. A bearing 24 is coaxially embedded in the fixed sleeve 22. The lower end of the rotating sleeve 6 vertically passes through the bearing 24, and the lower end of the rotating sleeve 6 is fixedly connected to the inner ring of the bearing 24. The upper end of the rotating sleeve 6 passes upward through the valve tube 10 and extends into the lifting hopper 4.

[0024] The lower end of the rotating sleeve 6 is rotatably connected to the valve tube 10 through a bearing 24. Since the valve tube 10 is fixedly connected to the lifting hopper 4, when the lifting hopper 4 is lifted or lowered, the rotating sleeve 6 will be driven to rotate by the transverse pin 8 sliding in the threaded groove 7. The conical head 21 provided on the top of the circular plate 20 is used to prevent the powder falling into the valve tube 10 from accumulating on the circular plate 20. When the elastic valve 9 rises, the powder falling into the valve tube 10 will be discharged from the plurality of blanking grooves 12 along the conical head 21.

[0025] In order to show the specific structure of the stirring arm and how the fixing rod 5 is installed, the following features are set: The lower end of the drying tank 1 is provided with a support 25, and a plurality of No. 1 connecting strips 26 are provided around the support 25 in a circular array. The support 25 is fixedly connected to the inner wall of the drying tank 1 through the plurality of No. 1 connecting strips 26 (such as Figure 6 As shown in the figure, the upper end of the fixed rod 5 is fixedly connected to the sealing cover plate 2, and the lower end of the fixed rod 5 is fixedly connected to the bracket 25. The stirring arm includes a plurality of groups of rotating arms evenly distributed along the circumferential direction of the rotating sleeve 6. Each group of rotating arms includes a scraper 27 and a plurality of connecting rods 28. The scraper 27 is in an inclined state, and the scraper 27 fits the conical inner wall of the lifting hopper 4. Each connecting rod 28 is horizontal, and the scraper 27 is connected to the rotating sleeve 6 through a plurality of connecting rods 28.

[0026] When the rotating sleeve 6 rotates, the rotating sleeve 6 will drive several groups of rotating arms to rotate. During this process, the scraper bar 27 will fit the conical inner wall of the lifting hopper 4 and rotate, so that the wet powder attached to the inner wall of the lifting hopper 4 can be scraped off by the scraper bar 27. When there is too much powder in the lifting hopper 4, the powder accumulated in the lifting hopper 4 can be stirred through several connecting rods 28 to accelerate the drying of the wet powder. When the powder falls into the lower end of the drying tank 1 from the valve tube 10, the powder will fall downward into the reflux pipe 3 through the gap between the adjacent No. 1 connecting bars 26. In actual use, the lower end of the rotating sleeve 6 can be connected to a group of rotating arms (the structure of this rotating arm is consistent with the rotating arm structure in the stirring arm, which is not shown in the figure). The rotating arm arranged at the lower end of the rotating sleeve 6 is located in the valve tube 10. The powder falling into the valve tube 10 is stirred by this rotating arm, and the powder is prevented from adhering to the inner wall of the valve tube 10.

[0027] In order to enable the lifting hopper 4 to scrape off the powder attached to the inner wall of the drying tank 1 when it rises, the following features are set: A scraper ring 29 is provided at the outer edge of the upper end of the lifting hopper 4. The scraper ring 29 is attached to the inner wall of the drying tank 1, and the scraper ring 29 and the lifting hopper 4 are coaxial. A plurality of No. 2 connecting strips 30 (such as Figure 7 As shown in FIG. 1 ), the scraper ring 29 is connected to the lifting hopper 4 through a plurality of No. 2 connecting bars 30 .

[0028] When the heating component injects hot air into the drying tank 1, the hot air will flow downward into the lower end of the drying tank 1 through the gap between the adjacent No. 2 connecting strips 30. Finally, when the powder falls into the lower end of the drying tank 1 from the valve tube 10, the hot air and the powder will enter the downstream cyclone separator through the reflux pipe 3. When the lifting hopper 4 rises, the scraper ring 29 will slide upward against the inner wall of the drying tank 1, so that the wet powder attached to the inner wall of the drying tank 1 will be scraped off by the scraper ring 29. After the wet powder is scraped off, the wet powder will fall downward into the lower end of the drying tank 1 through the gap between the adjacent No. 2 connecting strips 30. In the process, the wet powder will be completely dried by the hot air, and the powder that finally falls into the reflux pipe 3 is completely dry.

[0029] In order to show how the lifting hopper 4 is raised and lowered, the following features are set: Two groups of symmetrical driving mechanisms are provided on the sealing cover plate 2, each group of driving mechanisms includes a motor 31, a roller 32 and a traction rope 33. Two groups of symmetrical brackets 34 are formed on the outer wall of the upper end of the drying tank 1. Each motor 31 is horizontally fixed on the corresponding bracket 34, and the roller 32 rotates horizontally on the top of the sealing cover plate 2. The traction rope 33 is wound around the roller 32, one end of the traction rope 33 is fixedly connected to the roller 32, and the other end of the traction rope 33 is vertically downward and fixedly connected to the top of the lifting hopper 4.

[0030] The two motors 31 start and stop synchronously. When the two motors 31 rotate forward synchronously, the motor 31 will drive the corresponding roller 32 to rotate, so as to unwind the traction rope 33 through the roller 32. At this time, the lifting bucket 4 will gradually descend due to its own weight. When the two motors 31 rotate reversely synchronously, the roller 32 will reel in the traction rope 33. At this time, the lifting bucket 4 will be pulled upward by the two traction ropes 33.

[0031] In order to show the specific structure of the spray assembly, the following features are set: The spray assembly includes a No. 1 annular tube 35, a feed pipe 36 and a plurality of atomizing nozzles 37. The No. 1 annular tube 35 is horizontally fixed to the bottom of the sealing cover plate 2. The plurality of atomizing nozzles 37 are evenly distributed along the circumferential direction of the No. 1 annular tube 35. Each atomizing nozzle 37 is connected to the No. 1 annular tube 35. The feed pipe 36 is vertically connected to the No. 1 annular tube 35, and the feed pipe 36 passes upward through the sealing cover plate 2 and is extended outside the drying tank 1.

[0032] The solution containing calcium propionate is continuously injected into the first annular tube 35 through the feed pipe 36 , and then the solution containing calcium propionate flows into the plurality of atomizing nozzles 37 along the first annular tube 35 , and finally the solution containing calcium propionate is converted into liquid mist and sprayed out through the plurality of atomizing nozzles 37 .

[0033] In order to show the specific structure of the heating component, the following features are set: The heating assembly includes a No. 2 annular tube 38, an air intake pipe 39 and a plurality of hot air nozzles 40. The No. 2 annular tube 38 is horizontally fixed to the bottom of the sealing cover plate 2. The circumference of the No. 2 annular tube 38 is larger than the circumference of the No. 1 annular tube 35. The No. 1 annular tube 35 is located inside the No. 2 annular tube 38. The plurality of hot air nozzles 40 are evenly distributed along the circumferential direction of the No. 2 annular tube 38. Each hot air nozzle 40 is connected to the No. 2 annular tube 38. The air intake pipe 39 is vertically connected to the No. 2 annular tube 38, and the air intake pipe 39 passes through the sealing cover plate 2 upward and is extended outside the drying tank 1.

[0034] Hot air is continuously injected into the second annular pipe 38 through the air inlet pipe 39 , and then the hot air flows into the plurality of hot air nozzles 40 along the second annular pipe 38 , and finally the hot air is sprayed into the drying tank 1 through the plurality of hot air nozzles 40 .

[0035] Working principle: After calcium propionate is prepared, a solution or suspension containing calcium propionate is fed into the spray assembly through a high-pressure pump, and the solution containing calcium propionate is turned into mist by the spray assembly and sprayed downward into the drying tank 1. At the same time, the heating assembly will continue to spray hot air into the drying tank 1. When the hot air contacts the mist droplets, the water in the mist droplets will be evaporated and eventually become powder particles. Before the spray assembly sprays into the drying tank 1, the lifting hopper 4 in the transfer assembly will be in an ascending state. At this time, the lifting hopper 4 is close to the spray assembly. When the spray assembly sprays, the mist droplets will fall into the lifting hopper 4, and the mist droplets will evaporate in the lifting hopper 4 to form powder. Since the spray assembly continues to spray downward, some subsequent mist droplets may adhere to the dried powder, so a stirring mechanism is needed to stir the powder in the lifting hopper 4 to prevent the wet powder from adhering to the lifting hopper 4. The specific working process of the stirring mechanism is as follows: the lifting hopper 4 is slowly reciprocated in the drying tank 1. When the lifting hopper 4 is lifted and lowered, the transverse pin 8 inserted in the thread groove 7 will slide along the thread groove 7. Through the action of the transverse pin 8, the rotating sleeve 6 will rotate during the lifting and lowering of the lifting hopper 4. Finally, the stirring arm is driven by the rotating sleeve 6 to stir the powder falling into the lifting hopper 4, so as to accelerate the drying of the wet powder and prevent the wet powder from adhering to the lifting hopper 4. After the lifting hopper 4 is lowered, the lifting hopper 4 will gradually move away from the spray assembly. At this time, the powder in the lifting hopper 4 will be completely dried during the descending process of the lifting hopper 4. At this time, since the lifting hopper 4 is far away from the spray assembly, the subsequent falling mist droplets will be evaporated before falling into the lifting hopper 4. Then, after the lifting hopper 4 is lowered a certain distance, only completely dry powder will fall into the lifting hopper 4. When the lifting hopper 4 is lowered to the point where the elastic valve 9 conflicts with the upper top piece, the elastic valve 9 rises. At this time, the powder in the lifting hopper 4 will fall into the lower end of the drying tank 1, and the powder that finally falls into the drying tank 1 will be discharged through the reflux pipe 3. In actual use, the reflux pipe 3 is connected to the downstream cyclone separator (not shown in the figure), and the hot air and powder in the drying tank 1 will enter the cyclone separator together, and the hot air and powder will be separated by the cyclone separator to finally obtain a separate powder.

[0036] The above embodiments only express one or several implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the attached claims.

Claims

1. A drying device for preparing calcium propionate by fermentation, characterized in that: The invention comprises a drying tank (1) arranged vertically, a sealing cover plate (2) being fixedly provided on the top of the drying tank (1), the lower end of the drying tank (1) being gradually tapered in a cone shape, the top of the drying tank (1) being a closed structure, the bottom of the drying tank (1) being provided with a reflux pipe (3), a spray assembly, a heating assembly and a transfer assembly being provided in the drying tank (1), the spray mechanism being provided at the upper end of the drying tank (1), the heating assembly being provided at the side of the spray assembly, the transfer assembly being provided below the spray assembly, the transfer assembly comprising a lifting hopper (4) and a stirring mechanism, the small-diameter end of the lifting hopper (4) being downwardly facing, the stirring mechanism being provided in the lifting hopper (4), the stirring mechanism comprising a fixed rod (5), a rotating sleeve (6) and a stirring arm, the fixed rod (5) is vertically fixed in the drying tank (1), and the fixed rod (5) passes through the lifting hopper (4), the rotating sleeve (6) is coaxially sleeved outside the fixed rod (5), and the rotating sleeve (6) is rotatably connected to the lifting hopper (4), the outer wall of the fixed rod (5) is provided with a spirally ascending thread groove (7), the lower end of the rotating sleeve (6) is fixedly provided with a transverse pin (8), one end of the transverse pin (8) is inserted into the thread groove (7), the stirring arm is fixedly connected to the upper end of the rotating sleeve (6), the small-diameter end of the lifting hopper (4) is provided with a discharge valve, the discharge valve includes an elastic valve (9) for blocking powder, and the lower end of the drying tank (1) is provided with an upper top member for upwardly resisting the elastic valve (9) to make the powder fall.

2. A drying device for preparing calcium propionate by fermentation according to claim 1, characterized in that: The discharge valve further comprises a valve tube (10) and a spring (11). The valve tube (10) is vertical. The upper end of the valve tube (10) is coaxially fixedly connected to the lower end of the lifting hopper (4). The lower end of the valve tube (10) is provided with a sealing head. The outer wall of the lower end of the valve tube (10) is provided with a plurality of material-dropping through grooves (12) evenly distributed along the circumferential direction of the valve tube (10). The outer wall of the upper end of the valve tube (10) is formed with a sleeve (13) extending vertically downward. An annular accommodating chamber (14) is formed between the sleeve (13) and the valve tube (10). The elastic valve (9) is coaxially sleeved on the outer wall of the lower end of the valve tube (10) in an annular shape. The upper end of the elastic valve (9) extends into the annular accommodating chamber (14). The top of the elastic valve (9) A convex ring (15) is coaxially formed to slide in the annular accommodating cavity (14), two symmetrical support rods (16) are formed on the convex ring (15), two vertical slide grooves (17) are provided on the sleeve (13), each support rod (16) horizontally passes through the corresponding vertical slide groove (17), the spring (11) is vertically arranged in the annular accommodating cavity (14), and the two ends of the spring (11) respectively contact the convex ring (15) and the inner top wall of the annular accommodating cavity (14), a limiting ring (18) is fixedly provided at the bottom of the sleeve (13), and the upper top member includes two vertical rods (19) respectively corresponding to the support rods (16), and the lower end of each vertical rod (19) is fixedly connected to the inner wall of the drying tank (1).

3. A drying device for preparing calcium propionate by fermentation according to claim 2, characterized in that: The sealing head comprises a circular plate (20), a conical head (21) and a fixed sleeve (22); the circular plate (20) is coaxially fixed inside the lower end of the valve tube (10); the conical head (21) is coaxially formed at the top of the circular plate (20), and the small-diameter end of the conical head (21) faces upward; the fixed sleeve (22) is coaxially formed at the bottom of the circular plate (20); a vertical columnar through groove (23) is provided inside the conical head (21); the rotating sleeve (6) passes downward through the columnar through groove (23), and the outer wall of the rotating sleeve (6) is in contact with the inner wall of the columnar through groove (23); a bearing (24) is coaxially embedded inside the fixed sleeve (22); the lower end of the rotating sleeve (6) vertically passes through the bearing (24), and the lower end of the rotating sleeve (6) is fixedly connected to the inner ring of the bearing (24); the upper end of the rotating sleeve (6) passes upward through the valve tube (10) and extends into the lifting hopper (4).

4. A drying device for preparing calcium propionate by fermentation according to claim 1, characterized in that: A support seat (25) is provided at the lower end of the drying tank (1), and a plurality of No. 1 connecting bars (26) are provided around the support seat (25) in a circular array. The support seat (25) is fixedly connected to the inner wall of the drying tank (1) through the plurality of No. 1 connecting bars (26). The upper end of the fixed rod (5) is fixedly connected to the sealing cover plate (2), and the lower end of the fixed rod (5) is fixedly connected to the support seat (25). The stirring arm comprises a plurality of groups of rotating arms evenly distributed along the circumferential direction of the rotating sleeve (6), and each group of rotating arms comprises a scraper bar (27) and a plurality of connecting bars (28). The scraper bar (27) is in an inclined state, and the scraper bar (27) is in contact with the conical inner wall of the lifting hopper (4). Each connecting bar (28) is horizontal, and the scraper bar (27) is connected to the rotating sleeve (6) through the plurality of connecting bars (28).

5. A drying device for preparing calcium propionate by fermentation according to claim 1, characterized in that: A scraper ring (29) is provided at the outer edge of the upper end of the lifting hopper (4). The scraper ring (29) is attached to the inner wall of the drying tank (1), and the scraper ring (29) and the lifting hopper (4) are coaxial. A plurality of No. 2 connecting bars (30) evenly distributed along the circumferential direction of the lifting hopper (4) are provided between the scraper ring (29) and the lifting hopper (4). The scraper ring (29) is connected to the lifting hopper (4) via the plurality of No. 2 connecting bars (30).

6. A drying device for preparing calcium propionate by fermentation according to claim 5, characterized in that: Two groups of symmetrical drive mechanisms are provided on the sealing cover plate (2), each group of drive mechanisms comprises a motor (31), a roller (32) and a traction rope (33); two groups of symmetrical brackets (34) are formed on the outer wall of the upper end of the drying tank (1); each motor (31) is horizontally fixed on the corresponding bracket (34); the roller (32) rotates horizontally on the top of the sealing cover plate (2); the traction rope (33) is wound around the roller (32); one end of the traction rope (33) is fixedly connected to the roller (32); and the other end of the traction rope (33) is vertically downward and fixedly connected to the top of the lifting hopper (4).

7. A drying device for preparing calcium propionate by fermentation according to claim 1, characterized in that: The spray assembly comprises a first annular tube (35), a feed pipe (36) and a plurality of atomizing nozzles (37). The first annular tube (35) is horizontally fixed to the bottom of the sealing cover plate (2). The plurality of atomizing nozzles (37) are evenly distributed along the circumferential direction of the first annular tube (35). Each atomizing nozzle (37) is connected to the first annular tube (35). The feed pipe (36) is vertically connected to the first annular tube (35). The feed pipe (36) passes through the sealing cover plate (2) upward and is extended out of the drying tank (1).

8. A drying device for preparing calcium propionate by fermentation according to claim 1, characterized in that: The heating component comprises a No. 2 annular tube (38), an air inlet pipe (39) and a plurality of hot air nozzles (40). The No. 2 annular tube (38) is horizontally fixed to the bottom of the sealing cover plate (2). The circumference of the No. 2 annular tube (38) is greater than the circumference of the No. 1 annular tube (35). The No. 1 annular tube (35) is located inside the No. 2 annular tube (38). The plurality of hot air nozzles (40) are evenly distributed along the circumference of the No. 2 annular tube (38). Each hot air nozzle (40) is connected to the No. 2 annular tube (38). The air inlet pipe (39) is vertically connected to the No. 2 annular tube (38). The air inlet pipe (39) passes through the sealing cover plate (2) upward and is extended out of the drying tank (1).

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