A wiped film evaporator for chemical reactions

Abstract

The application relates to the technical field of chemical equipment, in particular to a wiped film evaporator for chemical reaction, which comprises a heating cylinder, the upper end of the heating cylinder is fixedly connected with a connecting pipe, a fixed column is fixedly arranged in the middle of the inside of the heating cylinder, a rotating pipe is rotatably connected to the outside of the fixed column, the rotating pipe is rotatably connected to the inside of the heating cylinder, a plurality of fixed pipes are fixedly arranged on the rotating pipe, a fixed scraper is fixedly connected to one end of the fixed pipe, the fixed pipe and the fixed scraper are located in the inside of the heating cylinder, a first soft scraper is fixedly arranged at one end of the fixed scraper, the first soft scraper is tightly attached to the inner wall of the heating cylinder, and the first soft scraper is slidably connected with the inner wall of the heating cylinder. The device can impact the inside of the fixed scraper through the impact ball, so that the fixed scraper and the soft scraper can vibrate, and the material adhered to the soft scraper can be shaken off.

Description

Technical Field

[0001] This invention relates to the field of chemical equipment technology, specifically to a scraped film evaporator for chemical reactions. Background Technology

[0002] A scraped-film evaporator is a high-efficiency vacuum evaporation device that uses a mechanical scraper to force film formation. Originating in the 1950s, it was designed to solve the problems of thick liquid films, low heat transfer efficiency, and long residence times in traditional evaporators when processing high-viscosity, heat-sensitive, and easily fouling materials. Its core working principle is to use a rotating scraper to scrape the material onto the heated wall surface into an extremely thin, uniform, and highly agitated liquid film, achieving low-temperature, short-time continuous evaporation and separation under vacuum conditions. Simultaneously, the continuous scraping action of the scraper effectively prevents scaling and coking on the heated surface. Due to these advantages, this equipment has been widely used in fine chemicals, pharmaceuticals, food, daily chemicals, and environmental protection industries.

[0003] During the use of existing equipment, as processing time increases, a significant amount of material adheres to the soft scraper, which may lead to scaling and affect the overall quality. Summary of the Invention

[0004] The purpose of this invention is to provide a scraped film evaporator for chemical reactions, in order to solve the problem mentioned in the background art where, during the use of the prior art, a large amount of material adheres to the soft scraper, which may lead to scaling of the material adhering to the soft scraper and thus affect the overall quality.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a scraped film evaporator for chemical reactions, comprising a heating cylinder, a connecting pipe fixedly connected to the upper end of the heating cylinder, a fixed column fixedly installed in the middle inside the heating cylinder, a rotating pipe rotatably connected to the outside of the fixed column, the rotating pipe rotatably connected to the inside of the heating cylinder, a plurality of fixed pipes fixedly installed on the rotating pipe, a fixed scraper fixedly connected to one end of the fixed pipe, both the fixed pipe and the fixed scraper being located inside the heating cylinder, a first soft scraper fixedly installed at one end of the fixed scraper, the first soft scraper being in close contact with the inner wall of the heating cylinder, and the first soft scraper being slidably connected to the inner wall of the heating cylinder.

[0006] Furthermore, the fixed column is provided with an outer arc-shaped sliding groove, a straight sliding groove, an inner arc-shaped sliding groove, and an oblique sliding groove, and the outer arc-shaped sliding groove, the straight sliding groove, the inner arc-shaped sliding groove, and the oblique sliding groove are interconnected.

[0007] Furthermore, the outer arc-shaped groove, the straight groove, the inner arc-shaped groove, and the inclined groove are internally slidably connected with sliding balls.

[0008] Furthermore, a sliding column is fixedly connected to one side of the sliding ball, the sliding column passes through the fixed tube, and the sliding column is slidably connected to the fixed tube.

[0009] Furthermore, a sliding disk is fixedly connected to the other end of the sliding column. The sliding disk is located inside the fixed scraper block, and a first spring is provided between the sliding disk and the fixed scraper block.

[0010] Furthermore, an impact ball is fixedly connected to one side of the sliding disk, and the impact ball is used to impact the interior of the fixed scraper block.

[0011] Furthermore, fixed rods are fixedly connected to both sides of the impact ball, and a fixed plate is fixedly connected to the other end of the fixed rod. The fixed plate is slidably connected to the inside of the fixed scraper block, and ball bearings are rotatably connected to both ends of the fixed plate.

[0012] Furthermore, the fixed scraper block has a guide groove inside, and a sliding column is slidably connected to the guide groove. A second spring is provided between the sliding column and the fixed scraper block. The second spring is located in the guide groove. A sliding scraper block is fixedly connected to one end of the sliding column, and a second soft scraper is fixedly connected to one side of the sliding scraper block. The second soft scraper is used to slide in connection with the inner wall of the heating cylinder.

[0013] Furthermore, the fixed scraper has an internal receiving groove, and one end of the receiving groove has an inclined slot. The second soft scraper is used to slide in connection with the receiving groove and the inclined slot.

[0014] Furthermore, a servo motor is fixedly installed at the upper end of the heating cylinder, and a transmission gear is fixedly connected to the power output end of the servo motor. The transmission gear meshes with a gear ring, and the gear ring is fixedly installed on the rotating tube.

[0015] The technical solution provided by this invention has the following advantages compared with the known prior art: I. The present invention utilizes the special groove on the fixed column and the cooperation of a strong spring to generate a high-speed impact action periodically during the rotation of the equipment. The impact ball impacts the inside of the scraper and generates high-frequency micro-vibration. This vibration can effectively shake off the film liquid adhering to the surface of the scraper. 2. The device of the present invention uses a rotating first soft scraper to scrape the material into a liquid film. At the same time, a second soft scraper that can automatically extend and retract is designed. When there is too much liquid film, it is easy to spill and accumulate from the edge. The second soft scraper can automatically extend outward to increase the scraping area and scrape the liquid film that overflows from the edge back onto the inner wall of the heating cylinder evenly. Third, the second soft scraper of the present invention adopts a design that extends to scrape coating and retracts to clean. When retracted, the inner wall of the fixed scraper block will scrape off the film liquid adhering to the second soft scraper, preventing the material from being carried into the mechanical gap. With the special inclined groove guide design, it effectively prevents mechanical jamming when the scraper retracts, ensuring that the entire transmission process is smooth and reliable. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a cross-sectional structural diagram of the present invention; Figure 3 This is a schematic diagram of the rotating tube structure of the present invention; Figure 4 This is a schematic diagram of the outer arc-shaped sliding groove structure of the present invention; Figure 5 This is a schematic cross-sectional view of the fixed scraper block of the present invention; Figure 6 This is a schematic diagram of the inclined slot structure of the present invention; Figure 7 This is a schematic diagram of the second spring structure of the present invention.

[0018] In the diagram: 1. Heating cylinder; 2. Connecting pipe; 3. Fixed column; 4. Rotating pipe; 5. Fixed pipe; 6. Fixed scraper block; 7. First soft scraper; 8. Outer arc-shaped slide groove; 9. Straight slide groove; 10. Inner arc-shaped slide groove; 11. Inclined slide groove; 12. Sliding ball; 13. Sliding column; 14. Sliding disc; 15. First spring; 16. Impact ball; 17. Fixed rod; 18. Fixed plate; 19. Ball bearing; 20. Guide inclined groove; 21. Sliding column; 22. Second spring; 23. Sliding scraper block; 24. Second soft scraper; 25. Receiving groove; 26. Inclined groove opening; 27. Servo motor; 28. Transmission gear; 29. ​​Gear ring. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0020] The present invention will be further described below with reference to embodiments.

[0021] Example: A scraped-film evaporator for chemical reactions, such as Figures 1-7 As shown, the device includes a heating cylinder 1, which is existing technology. The specific working principle will not be elaborated in detail. Professionals in this field can choose according to actual conditions. The upper end of the heating cylinder 1 is fixedly connected to a connecting pipe 2, through which materials can be conveyed into the heating cylinder 1. A fixed column 3 is fixedly installed in the middle of the interior of the heating cylinder 1. A rotating pipe 4 is rotatably connected to the outside of the fixed column 3. The rotating pipe 4 is rotatably connected to the interior of the heating cylinder 1. Multiple fixed pipes 5 are fixedly installed on the rotating pipe 4. A fixed scraper 6 is fixedly connected to one end of the fixed pipe 5. Both the fixed pipe 5 and the fixed scraper 6 are located inside the heating cylinder 1. A first soft scraper 7 is fixedly installed at one end of the fixed scraper 6. The first soft scraper 7 is in close contact with the inner wall of the heating cylinder 1 and is slidably connected to the inner wall of the heating cylinder 1. Through the design of the first soft scraper 7, the material inside the heating cylinder 1 can be scraped, so that the liquid film of the material can be evenly distributed on the inner wall of the heating cylinder 1.

[0022] The fixed column 3 is provided with an outer arc-shaped sliding groove 8, a straight sliding groove 9, an inner arc-shaped sliding groove 10, and an oblique sliding groove 11, which are interconnected.

[0023] The outer arc-shaped slide groove 8, the straight slide groove 9, the inner arc-shaped slide groove 10, and the oblique slide groove 11 are internally connected to a sliding ball 12. The sliding ball 12 is guided by the outer arc-shaped slide groove 8, the straight slide groove 9, the inner arc-shaped slide groove 10, and the oblique slide groove 11, so that the sliding ball 12 can slide laterally.

[0024] A sliding column 13 is fixedly connected to one side of the sliding ball 12. The sliding column 13 passes through the fixed tube 5 and is slidably connected to the fixed tube 5. Through the action of the sliding ball 12, the sliding column 13 can be driven to slide inside the fixed tube 5.

[0025] The other end of the sliding column 13 is fixedly connected to the sliding disk 14, which is located inside the fixed scraper block 6. A first spring 15 is provided between the sliding disk 14 and the fixed scraper block 6. Through the design of the first spring 15, the sliding disk 14 can be pushed to slide inside the fixed scraper block 6. While the first spring 15 pushes the sliding disk 14 to slide, the sliding disk 14 can drive the sliding column 13 and the sliding ball 12 to slide together.

[0026] An impact ball 16 is fixedly connected to one side of the sliding disk 14. The impact ball 16 is used to impact the inside of the fixed scraper block 6. When the first spring 15 drives the sliding disk 14 to slide, it can also drive the impact ball 16 to slide together. The impact ball 16 can impact the inside of the fixed scraper block 6, causing the fixed scraper block 6 to vibrate, which in turn causes the first soft scraper 7 to vibrate, so that the material adhering to the first soft scraper 7 can be shaken off onto the inner wall of the heating cylinder 1.

[0027] The two sides of the impact ball 16 are fixedly connected to the fixed rods 17, and the other end of the fixed rods 17 is fixedly connected to the fixed plate 18. The fixed plate 18 is slidably connected to the inside of the fixed scraper block 6. The two ends of the fixed plate 18 are rotatably connected to the balls 19. When the sliding disk 14 slides, it can drive the fixed rods 17 and the fixed plate 18 to slide together.

[0028] The fixed scraper block 6 has a guide groove 20 inside, and a sliding column 21 is slidably connected to the guide groove 20. A second spring 22 is provided between the sliding column 21 and the fixed scraper block 6. The second spring 22 is located inside the guide groove 20. A sliding scraper block 23 is fixedly connected to one end of the sliding column 21. A ball bearing 19 abuts against one side of the sliding scraper block 23. The design of the ball bearing 19 can reduce friction and prevent jamming. A second soft scraper 24 is fixedly connected to one side of the sliding scraper block 23. 4 is used for sliding connection with the inner wall of the heating cylinder 1. Through the design of the second soft scraper 24, when the film liquid is applied, when there is too much film liquid, a large amount of film liquid will flow away from both ends of the first soft scraper 7, resulting in uneven film liquid application. The design of the second soft scraper 24 extending from the fixed scraper block 6 can increase the application area, so that the flowing film liquid can be evenly applied to the inner wall of the heating cylinder 1 under the action of the second soft scraper 24. It should be noted that, see Figure 5 The elastic force of the first spring 15 is much greater than that of the second spring 22. At the same time, the elastic force of the first spring 15 is sufficient to drive the sliding disk 14, the impact ball 16, the fixed rod 17 and the fixed plate 18 to slide quickly to the right, so that the first spring 15 can impact the inside of the fixed scraper block 6 to generate vibration.

[0029] The fixed scraper block 6 has an internal receiving groove 25, and one end of the receiving groove 25 has an inclined slot 26. The second soft scraper 24 is used to slide in connection with the receiving groove 25 and the inclined slot 26. The design of the inclined slot 26 can prevent the second soft scraper 24 from getting stuck when it is retracted into the fixed scraper block 6, so that the second soft scraper 24 can freely extend and retract from the fixed scraper block 6.

[0030] A servo motor 27 is fixedly installed at the upper end of the heating cylinder 1. A transmission gear 28 is fixedly connected to the power output end of the servo motor 27. A gear ring 29 is meshed with the transmission gear 28. The gear ring 29 is fixedly installed on the rotating tube 4. Through the design of the servo motor 27, the transmission gear 28 and the gear ring 29, power can be provided to drive the rotation of the fixed scraper 6.

[0031] First, the material film liquid is delivered into the heating cylinder 1 through the connecting pipe 2. Then, the servo motor 27 is started, which drives the transmission gear 28 to rotate. While the transmission gear 28 is rotating, it drives the gear ring 29, so that the gear ring 29 can drive the rotating pipe 4 to rotate together. While the rotating pipe 4 is rotating, it can drive the fixed pipe 5, the fixed scraper 6 and the first soft scraper 7 to rotate around the fixed column 3 together, so that the first soft scraper 7 can evenly scrape the film liquid onto the inner wall of the heating cylinder 1. As the rotating tube 4 drives the fixed tube 5 and the fixed scraper 6 to rotate, it also drives the sliding column 13 and the sliding ball 12 to rotate together. At this time, the sliding ball 12 rotates inside the inner arc-shaped groove 10. As the rotating tube 4 continues to rotate, when the sliding ball 12 slides to the junction of the inner arc-shaped groove 10 and the straight groove 9, see... Figure 5 At this time, under the action of the first spring 15, the sliding disk 14, the sliding column 13 and the sliding ball 12 will be pushed to slide quickly to the right. While the sliding disk 14 slides quickly to the right, it will drive the impact ball 16 to slide together, so that the impact ball 16 can quickly impact the inside of the fixed scraper 6, causing the fixed scraper 6 to vibrate. While the fixed scraper 6 vibrates, it will drive the first soft scraper 7 to vibrate together, so as to shake off the liquid film adhering to the first soft scraper 7 and prevent the liquid film from forming a crust on the first soft scraper 7. At this time, the sliding ball 12 slides from the straight groove 9 to the junction of the straight groove 9 and the outer arc groove 8. As the sliding disc 14 slides to the right, it drives the fixed rod 17, the fixed plate 18, and the ball bearing 19 to slide together. As the fixed plate 18 slides to the right, it abuts against the sliding scraper block 23 through the ball bearing 19. The ball bearing 19 reduces the friction between the sliding scraper block 23 and the fixed plate 18, thus enabling the ball bearing 19 to push the sliding scraper block 23 to slide. As the sliding scraper block 23 slides, it drives the sliding column 21 to slide inside the guide groove 20. During the sliding process of the sliding column 21 in the guide groove 20, it compresses the second spring 22, providing power for the subsequent reset of the sliding column 21 and the sliding scraper block 23. As the sliding scraper block 23 slides, it drives the second soft scraper 24 to slide together, so that the second soft scraper 24 extends from both ends of the first soft scraper 7. The design of the second soft scraper 24 prevents a large amount of film liquid from flowing out from the top and bottom ends of the first soft scraper 7 when it is scraping the film liquid, which would cause the film liquid to accumulate. The design of the second soft scraper 24 extending from both sides can scrape the flowing film liquid to prevent the film liquid from accumulating and further scrape the film liquid evenly onto the inner wall of the heating cylinder 1. At this time, the sliding ball 12 will slide in the outer arc-shaped groove 8.

[0032] As the rotating tube 4 continues to rotate, when the sliding ball 12 slides to the junction of the outer arc-shaped groove 8 and the inclined groove 11, guided by the inclined groove 11, see Figure 5 This causes the sliding ball 12 to pull the sliding column 13 and the sliding disk 14 to slide to the left. As the sliding disk 14 slides to the left, it compresses the first spring 15, causing the first spring 15 to deform. As the sliding disk 14 slides to the left, it can pull the fixed plate 18 and the ball 19 to slide to the left together, thereby releasing the resistance to the sliding scraper block 23. At this time, under the action of the second spring 22, it will push the sliding column 21 to slide in the guide groove 20. As the sliding column 21 slides in the guide groove 20, it can drive the sliding scraper block 23 and the second soft scraper 24 to slide together, so that the second soft scraper 24 can retract into the fixed scraper block 6. At this time, the sliding ball 12 slides inside the inner arc-shaped sliding groove 10. By designing the second soft scraper 24 to retract into the fixed scraper block 6, the fixed scraper block 6 can scrape the side of the second soft scraper 24 facing the film liquid, thus removing the film liquid adhering to the second soft scraper 24 and preventing the film liquid from entering the fixed scraper block 6 along with the second soft scraper 24. At the same time, the vibration of the fixed scraper block 6 can also shake off the film liquid on the fixed scraper block 6. It should be noted that the inclined groove 26 is opened on the side of the second soft scraper 24 that does not contact the film liquid. The opening of the inclined groove 26 can prevent the second soft scraper 24 from getting stuck when it retracts into the fixed scraper block 6.

[0033] It should be noted that during operation, the servo motor 27 drives the transmission gear 28 and the gear ring 29, causing the rotating tube 4 and the fixed scraper block 6 to rotate continuously along the fixed column 3. The sliding ball 12 slides in the closed-loop groove opened on the fixed column 3. The closed-loop groove is composed of an outer arc-shaped groove 8, a straight groove 9, an inner arc-shaped groove 10, and an oblique groove 11 connected in sequence. During the rotation of the fixed scraper block 6, the sliding ball 12 goes through the following four stages in sequence, driving the impact ball 16 and the second soft scraper 24 to complete a complete self-cleaning cycle. In the first stage, when the sliding ball 12 is located in the inner arc-shaped groove 10, the sliding column 13 is in a state of being pulled back to the left, and the first elastic element 15 is compressed and stores energy. At this time, the second soft scraper 24 retracts into the fixed scraper block 6, and the first soft scraper 7 performs the film scraping operation normally. As the fixed scraper block 6 rotates, the sliding ball 12 slides to the junction of the inner arc-shaped groove 10 and the straight groove 9, and the first elastic element 15 is in a state of maximum compression, ready to be released. Second stage: When the sliding ball 12 enters the straight sliding groove 9, the first elastic element 15 is released instantaneously, pushing the sliding disk 14, impact ball 16, fixed rod 17, fixed plate 18 and ball 19 to slide quickly to the right. The ball 19 abuts against the inclined surface of the sliding scraper 23, pushing the sliding scraper 23 to move outward along the guide inclined groove 20, and the second elastic element 22 is compressed. The sliding scraper 23 drives the second soft scraper 24 to extend out of the receiving groove 25, pass through the inclined groove opening 26, and unfold outward from both ends of the fixed scraper 6. At this time, the second soft scraper 24 slides in contact with the inner wall of the heating cylinder 1, and performs secondary scraping of the film liquid overflowing from both ends of the first soft scraper 7 to prevent the film liquid from accumulating at the edges. In this stage, the impact ball 16 has not yet struck the inner wall of the fixed scraper 6, and the second soft scraper 24 is in a fully extended state; Third stage: As the fixed scraper 6 continues to rotate, the sliding ball 12 slides to the end of the straight groove 9. At this time, the impact ball 16, pushed by the first elastic element 15, impacts the inner wall of the right side of the fixed scraper 6 at a high speed. The vibration generated by the impact is transmitted through the fixed scraper 6 to the first soft scraper 7 and the second soft scraper 24, shaking off the film liquid adhering to the surface of the soft scraper and allowing it to re-adhere to the inner wall of the heating cylinder 1 to prevent scaling. At this time, the sliding ball 12 enters the outer arc-shaped groove 8, the impact ball 16 remains in contact with the inner wall of the fixed scraper 6, and the second soft scraper 24 remains in the extended state, continuing to scrape and coat. Fourth stage: When the sliding ball 12 slides to the junction of the outer arc-shaped groove 8 and the inclined groove 11, under the guidance of the inclined groove 11, the sliding ball 12 drives the sliding column 13 and the sliding disk 14 to slide to the left, and the first elastic element 15 is compressed again. The impact ball 16 moves to the left and disengages from the inner wall of the right side of the fixed scraper block 6.

[0034] At the same time, the fixed plate 18 and the ball 19 move to the left with the impact ball 16, releasing the resistance to the sliding scraper 23. Under the reset action of the second elastic element 22, the sliding column 21 drives the sliding scraper 23 and the second soft scraper 24 to retract into the fixed scraper 6 along the guide groove 20. During the retraction of the second soft scraper 24, its non-scraping side surface slides into contact with the wall of the inclined groove 26. The wall of the inclined groove 26 scrapes off the film liquid adhering to the second soft scraper 24, leaving the film liquid on the surface of the fixed scraper block 6. Subsequently, in the impact phase of the next cycle, these residual film liquids will be shaken off. The sliding ball 12 then enters the inner arc-shaped groove 10, completing a full rotation cycle and preparing to enter the next cycle.

[0035] In this embodiment: the servo motor 27 drives the transmission gear 28 and the gear ring 29 to rotate the rotating tube 4, which in turn drives the first soft scraper 7 to evenly scrape the material onto the inner wall of the heating cylinder 1 to form a liquid film through the fixed tube 5 and the fixed scraper block 6; the sliding ball 12 is guided to move by the outer arc-shaped slide groove 8, the straight slide groove 9, the inner arc-shaped slide groove 10 and the oblique slide groove 11 on the fixed column 3, and the strong elastic force of the first spring 15 drives the impact ball 16 to periodically impact the inside of the fixed scraper block 6, so that the first soft scraper 7 generates high-frequency micro-vibration, thereby effectively shaking off the adhered material. To prevent scabbing, the sliding column 13, sliding disk 14 and fixed rod 17 are linked together, and the rolling friction of the ball bearing 19 abuts against the sliding scraper block 23, which realizes the automatic extension and retraction of the second soft scraper 24. This can increase the scraping area and prevent the film liquid from leaking and accumulating from the edges of the first soft scraper 7. This allows the second soft scraper 24 to evenly scrape the leaked liquid from the edges onto the inner wall of the heating cylinder 1. At the same time, the design of the second soft scraper 24 retracting into the fixed scraper block 6 can also scrape the film liquid on the second soft scraper 24 onto the fixed scraper block 6.

[0036] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A scraped-film evaporator for chemical reactions, comprising a heating cylinder (1), wherein a connecting pipe (2) is fixedly connected to the upper end of the heating cylinder (1), characterized in that: A fixed column (3) is fixedly installed in the middle of the heating cylinder (1). A rotating tube (4) is rotatably connected to the outside of the fixed column (3). The rotating tube (4) is rotatably connected to the inside of the heating cylinder (1). Multiple fixed tubes (5) are fixedly installed on the rotating tube (4). A fixed scraper (6) is fixedly connected to one end of the fixed tube (5). The fixed tube (5) and the fixed scraper (6) are both located inside the heating cylinder (1). A first soft scraper (7) is fixedly installed at one end of the fixed scraper (6). The first soft scraper (7) is close to the inner wall of the heating cylinder (1) and is slidably connected to the inner wall of the heating cylinder (1).

2. The scraped-film evaporator for chemical reactions according to claim 1, characterized in that: The fixed column (3) is provided with an outer arc-shaped sliding groove (8), a straight sliding groove (9), an inner arc-shaped sliding groove (10) and an oblique sliding groove (11), and the outer arc-shaped sliding groove (8), the straight sliding groove (9), the inner arc-shaped sliding groove (10) and the oblique sliding groove (11) are interconnected.

3. A scraped-film evaporator for chemical reactions according to claim 2, characterized in that: The outer arc-shaped groove (8), the straight groove (9), the inner arc-shaped groove (10), and the oblique groove (11) are internally connected by sliding balls (12).

4. A scraped-film evaporator for chemical reactions according to claim 3, characterized in that: A sliding column (13) is fixedly connected to one side of the sliding ball (12). The sliding column (13) passes through the fixed tube (5) and is slidably connected to the fixed tube (5).

5. A scraped-film evaporator for chemical reactions according to claim 4, characterized in that: The other end of the sliding column (13) is fixedly connected to a sliding disk (14), which is located inside the fixed scraper block (6). A first spring (15) is provided between the sliding disk (14) and the fixed scraper block (6).

6. A scraped-film evaporator for chemical reactions according to claim 5, characterized in that: An impact ball (16) is fixedly connected to one side of the sliding disk (14), and the impact ball (16) is used to impact the interior of the fixed scraper (6).

7. A scraped-film evaporator for chemical reactions according to claim 6, characterized in that: The impact ball (16) is fixedly connected to two sides by a fixed rod (17), and the other end of the fixed rod (17) is fixedly connected to a fixed plate (18). The fixed plate (18) is slidably connected to the inside of the fixed scraper (6), and the two ends of the fixed plate (18) are rotatably connected to balls (19).

8. A scraped-film evaporator for chemical reactions according to claim 7, characterized in that: The fixed scraper block (6) has a guide groove (20) inside. The guide groove (20) is slidably connected to a sliding column (21). A second spring (22) is provided between the sliding column (21) and the fixed scraper block (6). The second spring (22) is located in the guide groove (20). A sliding scraper block (23) is fixedly connected to one end of the sliding column (21). A second soft scraper (24) is fixedly connected to one side of the sliding scraper block (23). The second soft scraper (24) is used to slide in connection with the inner wall of the heating cylinder (1).

9. A scraped-film evaporator for chemical reactions according to claim 8, characterized in that: The fixed scraper (6) has a receiving groove (25) inside, and a slanted slot (26) is provided at one end of the receiving groove (25). The second soft scraper (24) is used to slide in connection with the receiving groove (25) and the slanted slot (26).

10. A scraped-film evaporator for chemical reactions according to claim 1, characterized in that: A servo motor (27) is fixedly installed at the upper end of the heating cylinder (1). A transmission gear (28) is fixedly connected to the power output end of the servo motor (27). A gear ring (29) is meshed with the transmission gear (28). The gear ring (29) is fixedly installed on the rotating tube (4).

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