A spray drying device

Abstract

The present application provides a spray drying device, which relates to the field of drying technology, and includes a shell, an air inlet pipe connected to the bottom of the shell, a feed pipe, an air outlet pipe, a discharge pipe and an atomizing nozzle; an inner shell is arranged inside the shell, an air inlet is provided at the top edge of the inner shell, the air outlet pipe extends into the middle of the inner cavity of the inner shell, the feed pipe passes through the air outlet pipe and is connected to the atomizing nozzle, the atomizing nozzle faces the air inlet, the discharge pipe passes through the shell and is connected to the bottom of the inner shell, and a scraping mechanism capable of abutting against the inner wall of the inner shell is arranged inside the inner shell; wherein the gas introduced into the air inlet pipe is hot air. The present application can improve the drying effect of microalgae and reduce the risk of clogging of the filter yarn.

Description

Technical Field

[0001] The present application relates to the field of drying technology, and in particular to a spray drying device. Background Art

[0002] Microalgae are a class of tiny single-cell or multi-cell algae plants that usually grow in water and have the ability to photosynthesize. Microalgae are rich in proteins, growth factors, astaxanthin, algae polysaccharides, carotenoids and various vitamins, and are widely used in food, health care, medicine, agriculture, aquaculture and cosmetics industries. The commonly used microalgae cultivation method is to provide suitable light and temperature conditions and necessary nutrients in an appropriate culture medium, and then pass the carbon dioxide in the exhaust gas into the microalgae culture solution, and use the photosynthesis ability of the microalgae to convert carbon dioxide into organic matter. When the microalgae in the culture solution reaches a certain density, the culture solution is treated, such as drying, to collect and extract the microalgae.

[0003] Referring to the Chinese patent document with authorization announcement number CN209237364U, entitled A powder collecting mechanism for a sterile spray dryer for Haematococcus pluvialis liquid, in the patent, when in use, the microalgae culture solution is directly transported from the feed pipe to the atomizing nozzle for spraying, the dryer controls the drying net to operate to generate heat and dry the culture solution, and at the same time, the exhaust fan operates to extract the air in the powder collecting bin, so that the dried microalgae inside the shell are extracted into the powder collecting bin by using the feed pipe, and at the same time, the first solenoid valve is opened, and the external air is transported to the air intake filter through the air intake pipe and filtered into the shell, and the dried microalgae enter the powder collecting bin together with the incoming air and water vapor, and the air and water vapor are filtered through the filter gauze and discharged to the outside by the exhaust fan, and the dried microalgae are filtered through the filter gauze and collected in the lower part of the powder collecting bin. After the processing is completed, the second solenoid valve is opened to discharge it from the discharge pipe.

[0004] Referring to the above technical solution, when drying the microalgae, a large amount of water is vaporized during the drying process, and the vaporized water vapor will enter the powder collecting bin together with the microalgae. The dried microalgae are easily in contact with the water vapor and become wet again, resulting in poor drying effect. In addition, the wet microalgae are easy to adhere to the filter gauze and are not easy to fall off. When a large number of microalgae are gathered, the filter gauze will be blocked and affect the passage of water vapor and gas. Summary of the invention

[0005] In order to improve the technical problems of poor drying effect of microalgae and clogging of filter yarn affecting the passage of water vapor and gas, the present application provides a spray drying device.

[0006] The present application provides a spray drying device, which adopts the following technical scheme: a spray drying device, comprising a shell, an air inlet pipe connected to the bottom of the shell, a feed pipe, an air outlet pipe, a discharge pipe and an atomizing nozzle; an inner shell is arranged inside the shell, an air inlet is opened at the top edge of the inner shell, the air outlet pipe extends to the middle of the inner cavity of the inner shell, the feed pipe passes through the air outlet pipe and is connected to the atomizing nozzle, the atomizing nozzle is directly opposite to the air inlet, the discharge pipe passes through the shell and is connected to the bottom of the inner shell, and a scraping mechanism capable of abutting against the inner wall of the inner shell is arranged inside the inner shell; wherein the gas introduced into the air inlet pipe is hot air, and the temperature range of the hot air is 120 degrees to 280 degrees.

[0007] By adopting the above technical scheme, when it is necessary to dry the spray, hot air first enters the shell through the air inlet pipe, and then the hot air entering the shell flows upward and enters the inner shell through the air inlet, the hot air contacts the inner wall of the inner shell and rotates, and since it cannot be discharged at the top of the inner shell, the hot air rotates downward along the circumference of the inner shell, and at the same time, the microalgae culture solution is transported by the feed pipe and sprayed through the atomizing nozzle, and the hot air entering the inner shell rotates in the inner shell to dry the atomized microalgae culture solution, and the dried microalgae fall on the side wall of the inner shell under the action of centrifugal force, and the gas flowing in the shell can dry the microalgae falling on the side wall of the inner shell again, and then the scraping mechanism scrapes the microalgae to move the microalgae downward to the bottom of the inner shell and flow out of the inner shell along the discharge pipe.

[0008] In the present application, the method of filtering the microalgae with filter yarn is replaced by the method of rotating hot air in the inner shell to separate the microalgae from the hot air under the action of centrifugal force, thereby reducing the risk of microalgae clogging the filter yarn, and the hot air moves from the bottom of the shell to the top of the shell, which can heat and insulate the inner shell, so that the microalgae that fall on the inner shell wall can be continuously dried, reducing the risk of moisture when the microalgae are output and improving the drying effect of the microalgae.

[0009] Optionally, the feed pipe located in the air outlet pipe is spirally arranged.

[0010] By adopting the above technical solution, the microalgae culture solution in the feed pipe can be preheated by fully utilizing the heat of the hot air flowing out of the outlet pipe, which can improve energy utilization on the one hand and facilitate subsequent drying of the microalgae on the other hand.

[0011] Optionally, a spiral plate is fixedly connected to the inner wall of the inner shell.

[0012] By adopting the above technical solution, the setting of the spiral plate can, on the one hand, make the hot air rotate along the spiral plate, thereby increasing the time the hot air rotates in the inner shell, which is beneficial to improving the centrifugal effect on the microalgae. On the other hand, the spiral plate can increase the heat conduction area of ​​the inner shell, which is convenient for drying the microalgae.

[0013] Optionally, the scraper mechanism includes a support frame rotatably connected to the inner shell, the support frame is slidably connected to a support block, a coil spring is arranged above the support frame, the telescopic end of the coil spring is fixedly connected to the support block, a sliding rod is horizontally slidably connected to the support block, a scraper is fixedly connected to the sliding rod, the scraper can rotate along the spiral direction of the spiral plate when the support frame rotates, a first return spring is arranged between the scraper and the support block, the bottom of the inner shell is arranged in a cone shape, a rotation source for driving the support frame to rotate is arranged on the shell body, and a locking assembly is arranged on the support block, and the locking assembly is used to lock the sliding rod after the scraper is detached from the spiral plate.

[0014] By adopting the above technical solution, when scraping the microalgae, first start the rotation source, the rotation source drives the support frame to rotate, the rotation of the support frame drives the support block and the scraper to rotate and move downward along the spiral plate, and at the same time, the telescopic end of the coil spring moves with the support block, and when the scraper moves to the bottom of the inner shell, the conical structure at the bottom of the inner shell compresses the first return spring and causes the scraper to slide horizontally in the direction close to the central axis of the inner shell, and then when the scraper detaches from the spiral plate, the locking assembly locks the scraper on the support block, and the scraper stops sliding, and then the support block and the scraper move upward under the action of the restoring force of the coil spring.

[0015] Optionally, the locking assembly includes a T-block, a sliding groove for the T-block to slide is provided in the support block, an avoidance groove is provided in the T-block, a clamping block is fixedly connected to the bottom of the avoidance groove, the sliding rod is provided with a clamping groove that can cooperate with the clamping block, and a second return spring is arranged between the lower side wall of the upper horizontal plate of the T-block and the support block.

[0016] By adopting the above technical solution, when the scraper moves to the bottom of the inner shell and is pushed by the conical bottom of the inner shell to slide horizontally, the movement of the scraper drives the sliding rod to move, and when the slot moves to above the block, the T-block moves upward under the action of the restoring force of the second return spring, the slot and the block cooperate, and the scraper is locked, and when the support block moves to the top, the T-block contacts the support frame and is pushed downward, and at the same time the second return spring is compressed, the T-block moves downward and drives the block downward, the slot and the block are released, and the scraper moves toward the side wall of the inner shell under the action of the restoring force of the first return spring.

[0017] Optionally, a ventilation slot is provided in the middle of the scraper.

[0018] By adopting the above technical solution and setting the ventilation slots, hot air can pass through the scraper, which weakens the obstruction of the scraper on the flow of hot air and ensures the centrifugal effect on the microalgae.

[0019] Optionally, a scraper capable of matching the inner wall of the bottom of the inner shell is fixedly connected below the support frame, a rotating shaft is fixedly connected to the scraper, and a blade capable of abutting against the inner wall of the discharge pipe is fixedly connected to the rotating shaft.

[0020] By adopting the above technical solution, when the support frame rotates, the scraper, the rotating shaft and the blades rotate synchronously. The setting of the scraper can reduce the amount of microalgae adhering to the inner shell, and the setting of the blades can facilitate the transportation of the microalgae.

[0021] Optionally, a thickened plate is fixedly connected to one end of the spiral plate close to the discharge pipe.

[0022] By adopting the above technical solution and setting the thickened plate, the risk of interference and friction between the scraper and the spiral plate when the scraper is separated from the thickened plate and moves up is reduced, which is beneficial to increasing the life of the spiral plate and the scraper.

[0023] In summary, compared with the prior art, the present application includes at least one of the following beneficial technical effects:

[0024] 1. In the present application, the method of filtering the microalgae with the filter yarn is replaced by the method of rotating the hot air in the inner shell so that the microalgae are separated from the hot air under the action of centrifugal force, thereby reducing the risk of the microalgae clogging the filter yarn, and the hot air moves from the bottom of the shell to the top of the shell, which can heat and keep the inner shell warm, so that the microalgae falling on the inner shell wall can be continuously dried, reducing the risk of moisture when the microalgae are output, and improving the drying effect of the microalgae.

[0025] 2. Through the setting of the spiral plate, on the one hand, the hot air can rotate along the spiral plate, thereby increasing the time for the hot air to rotate in the inner shell, which is beneficial to improving the centrifugal effect on the microalgae. On the other hand, the spiral plate can increase the heat conduction area of ​​the inner shell, which is convenient for drying the microalgae. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present application;

[0027] Figure 2 This is a schematic diagram of the structure inside the housing in the embodiment of the present application;

[0028] Figure 3 This is a schematic diagram of the structure of the air inlet in the embodiment of the present application;

[0029] Figure 4 This is a structural schematic diagram of the scraping mechanism in the embodiment of the present application;

[0030] Figure 5 This is a schematic diagram of the structure of the locking assembly in the embodiment of the present application;

[0031] Figure 6This is a schematic diagram of the structure of the sliding groove in the embodiment of the present application;

[0032] Figure 7 It is a schematic diagram of the structure of the card block in the embodiment of the present application.

[0033] Explanation of the reference numerals: 1. Shell; 11. Air inlet pipe; 12. Feed pipe; 13. Air outlet pipe; 14. Discharge pipe; 15. Atomizing nozzle; 2. Inner shell; 21. Air inlet; 22. Spiral plate; 221. Thickened plate; 3. Scraper mechanism; 31. Support frame; 32. Support block; 321. Sliding groove; 33. Coil spring; 34. Sliding rod; 341. Slot; 35. Scraper; 351. Ventilation groove; 36. First return spring; 37. Rotation source; 38. Locking assembly; 381. T-block; 382. Avoidance groove; 383. Block; 384. Second return spring; 4. Scraper; 41. Rotation shaft; 411. Blade. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the following will be combined with the embodiments of the present application. Figure 1-Figure 7 , the technical scheme of the embodiment of the present application is clearly and completely described. Obviously, the described embodiment is a part of the embodiment of the present application, not all of the embodiments. Based on the described embodiment of the present application, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of this application.

[0035] Reference Figures 1 to 3 A spray drying device comprises a shell 1, an air inlet pipe 11, a feed pipe 12, an air outlet pipe 13, a discharge pipe 14 and an atomizing nozzle 15, wherein the air inlet pipe 11 is connected to the bottom of the shell 1, an inner shell 2 is arranged inside the shell 1, two air inlets 21 are radially opened at the top edge of the inner shell 2, the air outlet pipe 13 is connected to the top of the inner shell 2 and extends into the middle of the inner cavity of the inner shell 2, two feed pipes 12 are arranged and pass through the air outlet pipe 13, the two feed pipes 12 are connected to the two atomizing nozzles 15 in a one-to-one correspondence, the atomizing nozzles 15 are directly opposite to the air inlet 21, the discharge pipe 14 passes through the shell 1 and is connected to the bottom of the inner shell 2, a scraping mechanism 3 is arranged inside the inner shell 2, and the scraping mechanism 3 is used to scrape the microalgae, wherein the gas introduced into the air inlet pipe 11 is hot air, and the temperature range of the hot air can be 120 degrees to 280 degrees.

[0036] When the spray needs to be dried, hot air first enters the shell 1 through the air inlet pipe 11, and then the hot air entering the shell 1 flows upward and enters the inner shell 2 through the air inlet 21, the hot air contacts the inner wall of the inner shell 2 and rotates. Since the hot air cannot be discharged at the top of the inner shell 2, the hot air rotates downward along the circumference of the inner shell 2. At the same time, the microalgae culture solution is transported by the feed pipe 12 and sprayed through the atomizing nozzle 15. The hot air entering the inner shell 2 rotates in the inner shell 2 to dry the atomized microalgae culture solution, and the dried microalgae fall on the side wall of the inner shell 2 under the action of centrifugal force. The gas flowing in the shell 1 can dry the microalgae falling on the side wall of the inner shell 2 again, and then the scraping mechanism 3 scrapes the microalgae to move the microalgae downward to the bottom of the inner shell 2 and flow out of the inner shell 2 along the discharge pipe 14.

[0037] The hot air rotates in the inner shell 2 to separate the microalgae from the hot air under the action of centrifugal force instead of filtering the microalgae with the filter yarn, thereby reducing the risk of the microalgae clogging the filter yarn, and the hot air moves from the bottom of the shell 1 to the top of the shell 1, which can heat and keep the inner shell 2 warm, so that the microalgae falling on the wall of the inner shell 2 can be continuously dried, reducing the risk of moisture when the microalgae are output and improving the drying effect of the microalgae.

[0038] Reference Figure 2 and Figure 3 The feed pipe 12 located in the air outlet pipe 13 is spirally arranged.

[0039] The feeding pipe 12 in the air outlet pipe 13 is spirally arranged so that the microalgae culture solution in the feeding pipe 12 can be preheated by fully utilizing the heat of the hot air flowing out of the air outlet pipe 13, which can improve energy utilization and facilitate drying of the microalgae.

[0040] Reference Figure 2 and Figure 3 Two spiral plates 22 are fixedly connected to the inner circumferential side wall of the inner shell 2, and the interval between the two spiral plates 22 is the same.

[0041] By setting the spiral plate 22, on the one hand, the hot air can rotate along the spiral plate 22, thereby increasing the time for the hot air to rotate in the inner shell 2, which is beneficial to improving the centrifugal effect on the microalgae. On the other hand, the spiral plate 22 can increase the heat conduction area of ​​the inner shell 2, which is convenient for drying the microalgae.

[0042] Reference Figures 2 to 4The scraper mechanism 3 includes a support frame 31, a support block 32, a coil spring 33, a sliding rod 34, a scraper 35, a first return spring 36, a rotation source 37 and a locking assembly 38. A rotating ring is rotatably provided on the inner shell 2. The support frame 31 is rotatably connected to the inner side wall of the rotating ring. Two support blocks 32 are provided. The two support blocks 32 are vertically slidably connected to the support frame 31. The coil spring 33 is provided corresponding to the support block 32 and is installed above the support frame 31. The telescopic end of the coil spring 33 is fixedly connected to the support block 32. A sliding rod 34 is horizontally slidably connected to a support block 32. A scraper 35 is fixedly connected to a sliding rod 34. Each scraper 35 can rotate along a spiral plate 22 when the support frame 31 rotates. The height of the scraper 35 is equal to the distance between the two spiral plates 22. The first return spring 36 is arranged between the scraper 35 and the support block 32 and is sleeved on the sliding rod 34. The bottom of the inner shell 2 is arranged to be conical. The rotation source 37 is installed on the shell 1 and can drive the support frame 31 to rotate. The locking assembly 38 is arranged on the support block 32. The locking assembly 38 is used to lock the sliding rod 34 after the scraper 35 is separated from the spiral plate 22.

[0043] When scraping the microalgae, first start the rotation source 37, the rotation source 37 drives the support frame 31 to rotate, and the rotation of the support frame 31 drives the support block 32 and the scraper 35 to rotate and move downward along the spiral plate 22, and at the same time, the telescopic end of the coil spring 33 moves with the support block 32. When the scraper 35 moves to the bottom of the inner shell 2, the conical structure at the bottom of the inner shell 2 compresses the first return spring 36 and causes the scraper 35 to slide horizontally in the direction close to the central axis of the inner shell 2. Then, when the scraper 35 detaches from the spiral plate 22, the locking assembly 38 locks the scraper 35 on the support block 32, and the scraper 35 stops sliding. Then, the support block 32 and the scraper 35 move upward under the action of the restoring force of the coil spring 33.

[0044] Reference Figures 4 to 7 The locking assembly 38 includes a sliding groove 321, a T-block 381, an avoidance groove 382, ​​a block 383, a slot 341 and a second return spring 384. The sliding groove 321 is arranged in the support block 32, the T-block 381 is slidably connected in the sliding groove 321, the avoidance groove 382 is arranged in the T-block 381, the block 383 is fixedly connected to the bottom of the avoidance groove 382, ​​the slot 341 is arranged on the sliding rod 34 and can cooperate with the block 383, the second return spring 384 is arranged between the lower side wall of the upper horizontal plate of the T-block 381 and the support block 32, and the second return spring 384 is a compression spring, wherein, when the scraper 35 is separated from the spiral plate 22, the slot 341 can move to the top of the block 383.

[0045] When the scraper 35 moves to the bottom of the inner shell 2 and is pushed by the conical bottom of the inner shell 2 to slide horizontally, the scraper 35 moves and drives the sliding rod 34 to move. When the slot 341 moves above the block 383, the T-block 381 moves upward under the action of the restoring force of the second return spring 384, the slot 341 and the block 383 cooperate, and the scraper 35 is locked. When the support block 32 moves to the top, the T-block 381 contacts the support frame 31 and is pushed downward. At the same time, the second return spring 384 is compressed, the T-block 381 moves downward and drives the block 383 to move downward. The slot 341 and the block 383 are released, and the scraper 35 moves toward the side wall of the inner shell 2 under the action of the restoring force of the first return spring 36.

[0046] Reference Figure 4 and Figure 5 A ventilation slot 351 is provided in the middle of the scraper 35 .

[0047] By providing the ventilation slots 351, the hot air can pass through the scraper 35, thereby reducing the obstruction of the scraper 35 on the flow of the hot air and ensuring the centrifugal effect on the microalgae.

[0048] Reference Figures 2 to 4 A scraper 4 that can cooperate with the inner wall of the bottom of the inner shell 2 is fixedly connected to the support frame 31 below, a rotating shaft 41 is fixedly connected to the scraper 4, a blade 411 that can abut against the inner wall of the discharge pipe 14 is fixedly connected to the rotating shaft 41, a driving wheel is fixedly connected to the driving shaft of the rotation source 37, a driven wheel is fixedly sleeved on the rotating shaft 41, and a belt is jointly sleeved on the driving wheel and the driven wheel.

[0049] During operation, the rotation source 37 is started, and the driving shaft of the rotation source 37 rotates to drive the scraper 4, the rotation shaft 41, the blades 411 and the support frame 31 to rotate. The setting of the scraper 4 can reduce the amount of microalgae adhering to the inner shell 2, and the setting of the blades 411 can facilitate the transportation of the microalgae.

[0050] Reference Figure 2 and Figure 3 One end of the spiral plate 22 close to the discharge pipe 14 is fixedly connected with a thickened plate 221 .

[0051] The thickened plate 221 is provided to reduce the risk of interference and friction between the scraper 35 and the spiral plate 22 when the scraper 35 separates from the thickened plate 221 and moves upward, which is beneficial to increasing the service life of the spiral plate 22 and the scraper 35 .

[0052] The implementation principle of a spray drying device in the embodiment of the present application is:

[0053] When the microalgae need to be dried, hot air first enters the shell 1 through the air inlet pipe 11, and then moves up the shell 1 and enters the inner shell 2 through the air inlet 21. At the same time, the microalgae culture solution is transported through the feed pipe 12 and sprayed out through the atomizing nozzle 15. The hot air entering the inner shell 2 rotates to dry the atomized microalgae culture solution and makes the microalgae fall on the side wall of the inner shell 2 under the action of centrifugal force. The hot air flowing in the shell 1 continuously dries the microalgae falling on the side wall of the inner shell 2.

[0054] The rotation source 37 drives the support frame 31 to rotate, and the rotation of the support frame 31 drives the support block 32 and the scraper 35 to rotate and move downward along the spiral plate 22. At the same time, the telescopic end of the coil spring 33 moves with the support block 32, and the scraper 35 rotates to scrape the microalgae on the side wall of the inner shell 2. The scraped microalgae fall on the bottom of the inner shell 2 and are pushed by the scraper 4 to move toward the discharge pipe 14. The blade 411 rotates to transport the microalgae out of the inner shell 2 from the discharge pipe 14. When the scraper 35 moves to the bottom, the conical inner wall at the bottom of the inner shell 2 pushes the scraper 35 and the sliding rod 34 to move horizontally, and compresses the first return spring 36. When the scraper 35 and the spiral plate 22 are disengaged, the slot 341 moves The scraper 35 is clamped, and then the support block 32 and the scraper 35 move up under the restoring force of the coil spring 33, and the T-block 381 is blocked from moving downward and the second return spring 384 is compressed, and the T-block 381 moves downward and drives the block 383 to move downward, and the block 383 and the slot 341 are released from the match, and the scraper 35 moves toward the side wall of the inner shell 2 under the restoring force of the first return spring 36 and enters between the spiral plates 22, and then the scraper 35 continues to rotate along the spiral plates 22 driven by the support frame 31.

[0055] In addition, it should be noted that in the description of this application, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0056] The above is a preferred embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles described in the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A spray drying device, comprising a housing, an air inlet pipe connected to the bottom of the housing, a feed pipe, an air outlet pipe, a discharge pipe and an atomizing nozzle, characterized in that: An inner shell is arranged inside the shell, an air inlet is opened at the top edge of the inner shell, the air outlet pipe extends into the middle of the inner cavity of the inner shell, the feed pipe passes through the air outlet pipe and is connected to the atomizing nozzle, the atomizing nozzle is directly opposite to the air inlet, the discharge pipe passes through the shell and is connected to the bottom of the inner shell, and a scraping mechanism capable of abutting against the inner wall of the inner shell is arranged inside the inner shell; The feed pipe located in the air outlet pipe is spirally arranged; A spiral plate is fixedly connected to the inner wall of the inner shell; The scraper mechanism comprises a support frame rotatably connected to the inner shell, the support frame is slidably connected to a support block, a coil spring is arranged above the support frame, the telescopic end of the coil spring is fixedly connected to the support block, a sliding rod is horizontally slidably connected to the support block, and a scraper is fixedly connected to the sliding rod, and the scraper can rotate along the spiral direction of the spiral plate when the support frame rotates, a first return spring is arranged between the scraper and the support block, the bottom of the inner shell is arranged in a cone shape, a rotation source for driving the support frame to rotate is arranged on the shell body, and a locking assembly is arranged on the support block, and the locking assembly is used to lock the sliding rod after the scraper is separated from the spiral plate; The gas introduced into the air inlet pipe is hot air, and the temperature range of the hot air is 120 degrees to 280 degrees.

2. A spray drying device according to claim 1, characterized in that: The locking assembly includes a T-block, a sliding groove for the T-block to slide is provided in the support block, an avoidance groove is provided in the T-block, a clamping block is fixedly connected to the bottom of the avoidance groove, a clamping groove that can cooperate with the clamping block is provided on the sliding rod, and a second return spring is provided between the lower side wall of the upper horizontal plate of the T-block and the support block.

3. A spray drying device according to claim 2, characterized in that: A ventilation slot is provided in the middle of the scraper.

4. A spray drying device according to claim 1, characterized in that: A scraper blade that can match the inner wall of the bottom of the inner shell is fixedly connected below the support frame, a rotating shaft is fixedly connected to the scraper blade, and a blade that can abut against the inner wall of the discharge pipe is fixedly connected to the rotating shaft.

5. A spray drying device according to claim 1, characterized in that: One end of the spiral plate close to the discharge pipe is fixedly connected with a thickened plate.

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