A wiped film distillation apparatus

Abstract

The utility model relates to a technical field of chemical equipment, concretely is a kind of scraper film distillation device, including cylinder, the upper feeding pipe of being extended to the cylinder inside of being penetrated cylinder outside top, be located in the first motor of cylinder upper side, still include the flow guide mechanism of being located in the inner wall of cylinder and being located above scraper, the shunt mechanism of being located in the outer wall of first rotating shaft, and with the material preheating filtration processing mechanism of upper feeding pipe feed port intercommunication;The lower end of shunt mechanism extends to the inside of flow guide mechanism and with flow guide mechanism inside sliding fit;The first rotating shaft is penetrated flow guide mechanism and with flow guide mechanism gap cooperation;The upper feeding pipe is located above flow guide mechanism, and located shunt mechanism one side;The device can filter large particle impurities, reduce scraper wear to prolong life;Preheating material can reduce viscosity, promote film-forming uniformity, also can reduce evaporator heating load;Shunt mechanism makes material evenly distribute to flow guide hole by centrifugal force, avoid liquid film uneven.

Description

Technical Field

[0001] This utility model relates to the field of chemical equipment technology, specifically a scraped film distillation device. Background Technology

[0002] The scraped film evaporator, as a new type of high-efficiency evaporator, achieves forced film formation through rotating scrapers and can complete falling film evaporation in a vacuum environment. It features high heat transfer coefficient, high evaporation intensity, short material flow time, and wide operational flexibility, making it particularly suitable for evaporation, concentration, degassing, solvent removal, and distillation purification processes of products such as epoxy resins, polyurethanes, and silicones.

[0003] In existing technologies, traditional scraped-film distillation devices suffer from the following problems when processing high-viscosity materials containing large particulate impurities: Firstly, large particulate impurities directly enter the cylinder and create hard friction with the rotating scraper, accelerating scraper wear and shortening the equipment's replacement cycle and service life. Simultaneously, the high-viscosity material, lacking pretreatment, has poor flowability, making film formation on the inner wall of the cylinder difficult. This results in uneven liquid film thickness and requires more heat energy to reach the evaporation temperature, significantly increasing the heating load. Secondly, the material is only guided through the guide holes on the guide plate, leading to localized accumulation at these holes and severely uneven distribution on the inner wall of the cylinder. This affects heat transfer efficiency and the evaporation effect of light fractions, resulting in low overall distillation efficiency and unstable separation purity. Utility Model Content

[0004] The purpose of this invention is to provide a scraped film distillation device to solve the problems of low distillation efficiency and unstable separation purity when traditional scraped film distillation devices process high-viscosity materials containing large particulate impurities, which are caused by impurities aggravating scraper wear, difficulty in film formation of high-viscosity materials and high heating load, and uneven material distribution due to single flow guide.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a scraped film distillation device, comprising a cylinder, a feeding pipe extending through the top of the outer side of the cylinder and into the cylinder body, a first motor disposed on the upper side of the cylinder, a reducer connected to the output end of the first motor, a first rotating shaft connected to the output shaft of the reducer, and scrapers uniformly distributed and connected to the outer wall of the first rotating shaft, wherein the scrapers abut against the inner wall of the cylinder, and further comprising a flow guiding mechanism disposed on the inner wall of the cylinder and above the scrapers, a flow splitting mechanism disposed on the outer wall of the first rotating shaft, and a material preheating and filtration treatment mechanism communicating with the feed port of the feeding pipe; the lower end of the flow splitting mechanism extends into the interior of the flow guiding mechanism and slides within the flow guiding mechanism; the first rotating shaft passes through the flow guiding mechanism and is clearance-fitted with the flow guiding mechanism; the feeding pipe is located above the flow guiding mechanism and on one side of the flow splitting mechanism.

[0006] Furthermore, the flow guiding mechanism includes a flow guiding plate disposed on the inner wall of the cylinder, a first annular groove disposed on the upper side of the flow guiding plate, a second annular groove disposed on the lower outer edge of the inner side of the first annular groove, a plurality of inclined flow guiding holes opened on the lower side of the inner side of the second annular groove and communicating with the lower side of the flow guiding plate, a plurality of first vent holes penetrating the upper side of the flow guiding plate and located around the inner side of the first annular groove, and a perforation penetrating the upper side of the flow guiding plate and located around the inner side of the plurality of first vent holes; the perforation allows the first rotating shaft to pass through the flow guiding plate; the plurality of inclined flow guiding holes are arranged in an annular array, and the downward inclined end of the inclined flow guiding hole faces the inner wall of the cylinder, and the outlet diameter of the inclined flow guiding hole is smaller than the inlet diameter, forming a tapered structure; the upper side of the scraper has a chamfer on the side that is in contact with the inner wall of the cylinder.

[0007] Furthermore, the diversion mechanism includes an end cap cylindrical tube disposed on the outer wall of the first rotating shaft, a diversion ring plate disposed on the bottom outer side of the end cap cylindrical tube, a plurality of diversion blades disposed on the upper side of the diversion ring plate and arranged in a ring array, and a plurality of second vent holes disposed through the upper side of the end cap cylindrical tube and arranged in a ring array; one side of the diversion blades is connected to the outer wall of the end cap cylindrical tube; the outer edge of the diversion ring plate covers half of the upper opening of the second annular groove, and the diversion ring plate slides in fit with the interior of the first annular groove; the lower end of the end cap cylindrical tube extends into the interior of the first annular groove and slides in fit with the interior of the first annular groove.

[0008] Furthermore, the material preheating and filtration processing mechanism includes a preheating cylinder, a feed pipe connected to the top of one side of the preheating cylinder, a connecting ring plate located on the lower side of the preheating cylinder, a conical hopper located on the inner wall of the connecting ring plate and corresponding to the lower port of the preheating cylinder, a discharge port located in the middle of the lower side of the conical hopper, a filter shell located on the lower side of the connecting ring plate, a filter screen located inside the filter shell, an electric heating element located between the inner and outer walls of the preheating cylinder, a stirring mechanism located inside the preheating cylinder, and a clearing plate connected to the lower side of the stirring mechanism and acting on the upper side of the filter screen; the feed port of the feed pipe is connected to the discharge port of the filter shell, and a regulating valve is provided on the section of the feed pipe.

[0009] Furthermore, a fixing ring plate is provided on the top outer side of the filter housing, and the fixing ring plate and the connecting ring plate are detachably connected by multiple bolts; a sealing gasket is provided between the fixing ring plate and the connecting ring plate.

[0010] Furthermore, the stirring mechanism includes a second motor located on the upper side of the preheating cylinder, a second rotating shaft connected to the output end of the second motor and located inside the preheating cylinder, and a plurality of stirring blades evenly distributed on the outer wall of the second rotating shaft; one end of the second rotating shaft passes through the discharge port and is connected to the unblocking plate.

[0011] Furthermore, the outer top of the cylinder is connected to a light distillate outlet pipe, a primary condenser connected to the outlet port of the light distillate outlet pipe, a material outlet connected to the outlet port of the primary condenser, and a secondary condenser connected to the outlet port of the material outlet; the outer top of the preheating cylinder is connected to a branch conveying pipe, and the outlet port of the branch conveying pipe is connected to the outer wall of the light distillate outlet pipe.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0013] In actual operation, this invention integrates preheating and filtration functions through a material preheating and filtration treatment mechanism, providing high-quality feed for subsequent distillation. With the synergistic effect of the guiding and distributing mechanisms, a uniform liquid film forms on the inner wall of the cylinder, improving heat transfer efficiency and the evaporation effect of light fractions. This device filters out large particulate impurities from the material, preventing them from entering the cylinder and exacerbating scraper wear, thus extending equipment lifespan. Simultaneously, preheating the material not only reduces the viscosity of high-viscosity materials to improve the uniformity of subsequent film formation but also raises the material temperature in advance, reducing the heating load after entering the evaporator. Furthermore, the distributing mechanism allows the material to be more evenly distributed to each inclined guide hole under centrifugal force, avoiding uneven liquid film thickness caused by localized accumulation. Attached Figure Description

[0014] Figure 1 This is a cross-sectional schematic diagram of the scraped film distillation device of this utility model;

[0015] Figure 2 For the present utility model Figure 1 Enlarged view of point A in the middle;

[0016] Figure 3 This is a cross-sectional schematic diagram of the material preheating and filtration treatment mechanism of this utility model;

[0017] Figure 4 This is a schematic diagram of the flow divider impeller of this utility model.

[0018] In the diagram: 1. Cylinder; 2. First motor; 3. Reducer; 4. First shaft; 5. Scraper; 6. Light fraction outlet pipe; 7. First-stage condenser; 8. Material outlet; 9. Second-stage condenser; 10. Guide plate; 11. First annular groove; 12. Second annular groove; 13. Inclined guide hole; 14. First vent hole; 15. End cap cylindrical cylinder; 16. Diverting ring plate; 17. Diverting blade; 18. Second vent hole; 19. Preheating cylinder; 20. Feed pipe; 21. Electric heating element; 22. Conical hopper; 23. Discharge port; 24. Connecting ring plate; 25. Second motor; 26. Second shaft; 27. Stirring blade; 28. Unblocking plate; 29. ​​Filter shell; 30. Feed pipe; 31. Regulating valve; 32. Filter screen; 33. Fixed ring plate; 34. Material preheating and filtration treatment mechanism; 35. Branch conveying pipe. Detailed Implementation

[0019] Please see Figure 1-4 A scraped-film distillation apparatus includes a cylinder 1, a feed pipe 30 extending through the top of the outer side of the cylinder 1 and into the cylinder 1, a first motor 2 fixedly connected to the upper side of the cylinder 1, a reducer 3 connected to the output end of the first motor 2, a first rotating shaft 4 connected to the output shaft of the reducer 3, and scrapers 5 uniformly arranged and connected to the outer wall of the first rotating shaft 4 by a plurality of longitudinally spaced fixed rods, the scrapers 5 abutting against the inner wall of the cylinder 1, and a flow guiding mechanism disposed on the inner wall of the cylinder 1 and located above the scrapers 5. The system includes a diversion mechanism located on the outer wall of the first rotating shaft 4, and a material preheating and filtration treatment mechanism 34 connected to the feed port of the feeding pipe 30. The lower end of the diversion mechanism extends into the interior of the guiding mechanism and slides within the guiding mechanism. The first rotating shaft 4 passes through the guiding mechanism and is clearance-fitted with it. The feeding pipe 30 is located above the guiding mechanism and on one side of the diversion mechanism. The lower side of the cylinder 1 has a concentrated liquid outlet, and the outer wall has a jacket with a steam inlet and a steam outlet for introducing steam. The bottom center of the cylinder 1 has a concentrated liquid outlet, and the outlet end has a flange connection structure. The outer wall of the cylinder 1 is fitted with a jacket, which forms a closed annular steam chamber with the outer wall of the cylinder 1. The lower side of the jacket has a steam inlet, and the upper side has a steam outlet. The outer wall of the jacket has an insulation layer made of aluminum silicate fiber felt or polyurethane foam material with a thickness of [thickness value missing].

[0020] The flow guiding mechanism includes a flow guiding plate 10 fixedly connected to the inner wall of the cylinder 1, a first annular groove 11 on the upper side of the flow guiding plate 10, a second annular groove 12 on the lower outer edge of the inner side of the first annular groove 11, a plurality of inclined flow guiding holes 13 opened on the lower side of the inner side of the second annular groove 12 and communicating with the lower side of the flow guiding plate 10, a plurality of first vent holes 14 penetrating the upper side of the flow guiding plate 10 and located around the inner side of the first annular groove 11, and a through hole penetrating the upper side of the flow guiding plate 10 and located around the inner side of the plurality of first vent holes 14; the through hole allows the first rotating shaft 4 to pass through the flow guiding plate 10; the outlet end of the inclined flow guiding hole 13 points to the inner wall of the cylinder 1; the plurality of inclined flow guiding holes 13 are arranged in an annular array, and the downward inclined end of the inclined flow guiding hole 13 faces the inner wall of the cylinder 1, and the outlet diameter of the inclined flow guiding hole 13 is smaller than that of the inlet end, forming a tapered structure; the upper side of the scraper 5 is chamfered on the side that is in contact with the inner wall of the cylinder 1. The first vent 14 and the second vent 18 of the end cap cylindrical tube 15 form a through steam channel.

[0021] The diversion mechanism includes an end cap cylindrical tube 15 disposed on the outer wall of the first rotating shaft 4, a diversion ring plate 16 integrally formed on the bottom outer side of the end cap cylindrical tube 15, a plurality of diversion blades 17 fixedly connected to the upper side of the diversion ring plate 16 and arranged in a ring array, and a plurality of second vent holes 18 penetrating the upper side of the end cap cylindrical tube 15 and arranged in a ring array; one side of the diversion blades 17 is connected to the outer wall of the end cap cylindrical tube 15; the outer edge of the diversion ring plate 16 covers half of the upper opening of the second annular groove 12, and the diversion ring plate 16 slides in cooperation with the interior of the first annular groove 11; the lower end of the end cap cylindrical tube 15 extends into the interior of the first annular groove 11 and slides in cooperation with the interior of the first annular groove 11; the upper surface of the diversion ring plate 16 forms a conical structure that slopes downward from the middle to the outer periphery. Through the coordinated rotation of the end cap cylindrical cylinder 15, the diversion ring plate 16, and the diversion blades 17, the material is evenly distributed radially along the diversion ring plate 16 into the second annular groove 12 by centrifugal force. The conical structure of the diversion ring plate 16 further guides the material to diffuse to the periphery, ensuring that the material forms a uniform liquid film on the cylinder wall of the cylinder 1. The diversion ring plate 16 covers the upper half of the second annular groove 12, which not only prevents the material from falling directly into the guide hole and causing impact blockage, but also allows the material to overflow from the edge of the diversion ring plate 16 and enter the inclined guide hole 13 at a stable flow rate. The second vent hole 18 provides an upward channel for steam.

[0022] The material preheating and filtration processing mechanism 34 includes a preheating cylinder 19, a feed pipe 20 connected to the top of one side of the preheating cylinder 19, a connecting ring plate 24 located on the lower side of the preheating cylinder 19, a conical hopper 22 connected to the inner wall of the connecting ring plate 24 and corresponding to the lower port of the preheating cylinder 19, a discharge port 23 located in the middle of the lower side of the conical hopper 22, a filter housing 29 located on the lower side of the connecting ring plate 24, a filter screen 32 detachably connected to the inside of the filter housing 29 by bolts, an electric heating element 21 located between the inner and outer walls of the preheating cylinder 19, a stirring mechanism located inside the preheating cylinder 19, and a cleaning plate 28 connected to the lower side of the stirring mechanism and acting on the upper side of the filter screen 32; the feed port of the feed pipe 30 is connected to the discharge port of the filter housing 29, and a regulating valve 31 is provided on the pipe section of the feed pipe 30; an elastic scraper (such as polytetrafluoroethylene material) is connected to the bottom of the cleaning plate 28. The conical hopper 22 guides the material to be concentrated and transported to the filter shell 29. The filter screen 32 intercepts impurities. The polytetrafluoroethylene elastic scraper at the bottom of the cleaning plate 28 rotates synchronously with the stirring mechanism to continuously clean the blockage on the surface of the filter screen. The regulating valve 31 can accurately control the flow rate of material entering the cylinder 1 to avoid excessive or insufficient raw materials affecting the distillation effect.

[0023] A fixing ring plate 33 is integrally formed on the top outer side of the filter housing 29. The fixing ring plate 33 and the connecting ring plate 24 are detachably connected by multiple bolts evenly distributed around the circumference. A sealing gasket is clamped between the mating surfaces of the fixing ring plate 33 and the connecting ring plate 24. The fixing ring plate 33 and the connecting ring plate 24 are detachably connected by multiple bolts, which facilitates quick disassembly of the filter housing 29 to replace the filter screen 32 or to perform internal cleaning. At the same time, the sealing gasket can block the material leakage path and ensure that the material does not overflow during the filtration process.

[0024] The stirring mechanism includes a second motor 25 fixedly connected to the upper side of the preheating cylinder 19, a second rotating shaft 26 rigidly connected to the output end of the second motor 25 and located inside the preheating cylinder 19, and multiple stirring blades 27 evenly distributed on the outer wall of the second rotating shaft 26; one end of the second rotating shaft 26 passes through the discharge port 23 and is connected to the unblocking plate 28. The second motor 25 drives the second rotating shaft 26 to rotate, causing the stirring blades 27 to stir the material in the preheating cylinder 19, so that the material is heated evenly and avoids local overheating, thereby improving the preheating efficiency; at the same time, the second rotating shaft 26 passes through the discharge port 23 and is connected to the unblocking plate 28, which can simultaneously drive the elastic scraper at the bottom of the unblocking plate 28 to clean the filter screen 32, preventing impurities from clogging the filter screen 32.

[0025] The outer top of the cylinder 1 is connected to a light distillate outlet pipe 6, a primary condenser 7 connected to the outlet port of the light distillate outlet pipe 6, a material outlet 8 connected to the outlet port of the primary condenser 7, and a secondary condenser 9 connected to the outlet port of the material outlet 8. The outer top of the preheating cylinder 19 is connected to a branch conveying pipe 35, the outlet port of which is connected to the outer wall of the light distillate outlet pipe 6. The lower bottom of the secondary condenser 9 is provided with a material discharge port, and its port is provided with a flange interface with a manual shut-off valve. The light distillate outlet pipe 6 at the top of the cylinder 1 serves as the main steam channel, introducing the light distillate steam generated by distillation into the primary condenser 7 for preliminary condensation. The residual steam that is not completely condensed enters the secondary condenser 9 for deep condensation through the material outlet 8. The dual condensation design improves the light distillate recovery rate. The secondary steam generated by the preheating cylinder 19 flows into the light distillate outlet pipe 6 through the branch conveying pipe 35 and participates in the condensation process together with the main steam, avoiding material loss and energy waste caused by direct discharge of secondary steam, and achieving efficient utilization of energy and materials.

[0026] A PLC controller is installed on the outer wall of the cylinder 1. The PLC controller is electrically connected to the electric heating element 21, the first motor 2, and the second motor 25. The heating power of the electric heating element 21, the output speed of the first motor 2 (including the reducer 3), and the stirring speed of the second motor 25 can be controlled in a coordinated manner through preset programs or real-time sensor signals.

[0027] Working process and principle: The PLC controller starts the electric heating element 21, the first motor 2 (with reducer 3) and the second motor 25, and each component operates in coordination according to the preset program; the material enters the preheating cylinder 19 through the feed pipe 20, and is preheated and uniformly mixed under the heating of the electric heating element 21 and the stirring blades 27 of the stirring mechanism. At the same time, it is conveyed to the filter shell 29 through the discharge port 23 on the conical hopper 22, and impurities are removed by the filter screen 32. The elastic scraper at the bottom of the clearing plate 28 rotates with the second rotating shaft 26 to clean the blockage on the filter screen 32. The filtered material is conveyed to the inside of the cylinder 1 through the feed pipe 30 with the regulating valve 31; the first rotating shaft 4 driven by the first motor 2 rotates, and the first rotating shaft 4 drives the scraper 5 to rotate. The material entering the cylinder 1 falls onto the guide plate 10, and the centrifugal force generated by the rotation of the diversion ring plate 16 and the diversion blades 17 with the first rotating shaft 4 acts as a guide plate. The liquid is evenly distributed in the second annular groove 12, and then guided to the inner wall of the cylinder 1 through the inclined guide hole 13 with the diameter gradually decreasing from top to bottom, forming a uniform liquid film. The scraper 5 further scrapes the liquid film evenly and promotes its flow along the cylinder wall. During the process, the steam introduced into the outer jacket of the cylinder 1 heats the liquid film through the annular steam chamber, causing the light distillate to evaporate into steam. The steam enters the light distillate outlet pipe 6 through the first vent hole 14 of the guide plate 10 and the second vent hole 18 of the end cap cylindrical cylinder 15. The light distillate steam is condensed in sequence through the first-stage condenser 7 and the second-stage condenser 9. The condensed material is discharged from the material outlet 8 and the material discharge outlet with a manual shut-off valve flange interface, respectively. The secondary steam generated in the preheating cylinder 19 is collected into the light distillate outlet pipe 6 through the branch conveying pipe 35 for processing together. The concentrated liquid after distillation is discharged from the concentrated liquid outlet with a flange connection structure at the bottom of the cylinder 1, realizing the efficient distillation and separation of materials.

[0028] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A scraped film distillation apparatus, comprising a cylinder (1), a feed pipe (30) penetrating the top of the outer side of the cylinder (1) and extending into the cylinder (1), a first motor (2) disposed on the upper side of the cylinder (1), a reducer (3) connected to the output end of the first motor (2), a first rotating shaft (4) connected to the output shaft of the reducer (3), and scrapers (5) uniformly arranged and connected to the outer wall of the first rotating shaft (4), wherein the scrapers (5) abut against the inner wall of the cylinder (1), characterized in that, It also includes a flow guiding mechanism located on the inner wall of the cylinder (1) and above the scraper (5), a flow splitting mechanism located on the outer wall of the first rotating shaft (4), and a material preheating and filtration treatment mechanism (34) connected to the feed port of the feed pipe (30); the lower end of the flow splitting mechanism extends into the interior of the flow guiding mechanism and slides in cooperation with the interior of the flow guiding mechanism; the first rotating shaft (4) passes through the flow guiding mechanism and is in clearance cooperation with the flow guiding mechanism; the feed pipe (30) is located above the flow guiding mechanism and on one side of the flow splitting mechanism.

2. The thin-film distillation apparatus according to claim 1, characterized in that, The flow guiding mechanism includes a flow guiding plate (10) disposed on the inner wall of the cylinder (1), a first annular groove (11) disposed on the upper side of the flow guiding plate (10), a second annular groove (12) disposed on the lower outer edge of the inner side of the first annular groove (11), a plurality of inclined flow guiding holes (13) opened on the lower side of the inner side of the second annular groove (12) and communicating with the lower side of the flow guiding plate (10), a plurality of first vent holes (14) penetrating the upper side of the flow guiding plate (10) and located around the inner annular groove (11), and a penetrating... A perforation is provided on the upper side of the guide plate (10) and located around the multiple first vent holes (14); the perforation allows the first rotating shaft (4) to pass through the guide plate (10); multiple inclined guide holes (13) are arranged in a ring array, and the downward inclined end of the inclined guide hole (13) faces the inner wall of the cylinder (1), and the outlet end of the inclined guide hole (13) is smaller than the inlet end, forming a tapered structure; the upper side of the scraper (5) is chamfered on the side that is in contact with the inner wall of the cylinder (1).

3. The thin-film distillation apparatus according to claim 2, characterized in that, The diversion mechanism includes an end cap cylindrical tube (15) disposed on the outer wall of the first rotating shaft (4), a diversion ring plate (16) disposed on the bottom of the outer side of the end cap cylindrical tube (15), a plurality of diversion blades (17) disposed on the upper side of the diversion ring plate (16) and arranged in a ring array, and a plurality of second vent holes (18) disposed on the upper side of the end cap cylindrical tube (15) and arranged in a ring array; one side of the diversion blades (17) is connected to the outer wall of the end cap cylindrical tube (15); the outer edge of the diversion ring plate (16) covers half of the upper opening of the second annular groove (12), and the diversion ring plate (16) slides in cooperation with the interior of the first annular groove (11); the lower end of the end cap cylindrical tube (15) extends into the interior of the first annular groove (11) and slides in cooperation with the interior of the first annular groove (11).

4. The thin-film distillation apparatus according to claim 1, characterized in that, The material preheating and filtration processing mechanism (34) includes a preheating cylinder (19), a feed pipe (20) connected to the top of one side of the preheating cylinder (19), a connecting ring plate (24) located on the lower side of the preheating cylinder (19), a conical hopper (22) located on the inner wall of the connecting ring plate (24) and corresponding to the lower port of the preheating cylinder (19), a discharge port (23) located in the middle of the lower side of the conical hopper (22), a filter shell (29) located on the lower side of the connecting ring plate (24), a filter screen (32) located inside the filter shell (29), an electric heating element (21) located between the inner and outer walls of the preheating cylinder (19), a stirring mechanism located inside the preheating cylinder (19), and a cleaning plate (28) connected to the lower side of the stirring mechanism and acting on the upper side of the filter screen (32); the feed port of the feed pipe (30) is connected to the discharge port of the filter shell (29), and a regulating valve (31) is provided on the pipe section of the feed pipe (30).

5. The thin-film distillation apparatus according to claim 4, characterized in that, The outer top of the filter housing (29) is provided with a fixing ring plate (33), and the fixing ring plate (33) and the connecting ring plate (24) are detachably connected by multiple bolts; a sealing gasket is provided between the fixing ring plate (33) and the connecting ring plate (24).

6. The thin-film distillation apparatus according to claim 4, characterized in that, The stirring mechanism includes a second motor (25) located on the upper side of the preheating cylinder (19), a second rotating shaft (26) connected to the output end of the second motor (25) and located inside the preheating cylinder (19), and a plurality of stirring blades (27) evenly distributed on the outer wall of the second rotating shaft (26); one end of the second rotating shaft (26) passes through the discharge port (23) and is connected to the unblocking plate (28).

7. The thin-film distillation apparatus according to claim 4, characterized in that, The outer top of the cylinder (1) is connected to a light distillate outlet pipe (6), a primary condenser (7) connected to the discharge port of the light distillate outlet pipe (6), a material outlet (8) connected to the discharge port of the primary condenser (7), and a secondary condenser (9) connected to the discharge port of the material outlet (8); the outer top of the preheating cylinder (19) is connected to a branch conveying pipe (35), and the discharge port of the branch conveying pipe (35) is connected to the outer wall of the light distillate outlet pipe (6).

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