Scraper type film evaporator

Abstract

The invention relates to a scraper type film evaporator, and belongs to the technical field of evaporators, the scraper type film evaporator comprises a heating cylinder and a scraper plate, a vertical pipe is rotatably arranged in the heating cylinder, the center line of the vertical pipe and the center line of the heating cylinder coincide, the vertical pipe rotates relative to the heating cylinder, and a connecting plate is fixed between the vertical pipe and the scraper plate; a scraper is arranged on the scraper in a sliding mode, the scraper slides in the direction close to or away from the inner wall of the heating cylinder, the end face of the end, close to the inner wall of the heating cylinder, of the scraper is inclined, and the included angle between the inclined face of the scraper and the inner wall of the heating cylinder ranges from 15 degrees to 30 degrees; and a moving assembly used for driving the scraper to move is arranged between the heating cylinder and the scraper. The raw material liquid drying and recycling device has the effects that raw material liquid can be conveniently scraped to be thin, and the drying and recycling efficiency of the raw material liquid is improved.

Description

Technical Field

[0001] This application relates to the technical field of evaporators, and in particular to a scraper-type thin-film evaporator. Background Art

[0002] In the fields of chemical engineering and material processing, thin-film evaporators, as an efficient heat exchange device, are widely used in the evaporation and concentration processes of materials. Currently, the scraping thin-film evaporator has a heating steam jacket installed outside the shell, and a rotatable scraper installed inside it. The scraper is driven by a rotating shaft at the center of the cylinder. The scraping thin-film evaporator has significant effects. It can make the material evaporate in a film form, efficiently concentrate fruit juices, traditional Chinese medicine extracts, etc.; separate and purify chemical raw materials by utilizing the difference in volatility; due to the short residence time, it is suitable for processing heat-sensitive materials such as vitamins; the rotating scraper can also prevent the material from scaling and crystallizing, ensuring the stable operation of the equipment.

[0003] After the raw material liquid is added tangentially from the upper part of the evaporator, under the action of gravity and the rotating scraper, a downward rotating thin film is formed along the inner wall surface of the shell. The completed liquid is discharged outside the device from the bottom, and the secondary steam is discharged from the upper part after passing through the demister. The prominent advantage of this evaporator is its strong adaptability to materials, and it is applicable to the evaporation of high-viscosity, easy-to-crystallize, easy-to-scale, suspension-containing or heat-sensitive material liquids.

[0004] When the thin-film evaporator processes high-viscosity materials (such as boric acid), the resistance encountered by the scraper becomes larger, making it difficult to scrape, resulting in the material being difficult to be effectively scraped thin, low drying efficiency, and affecting solvent recovery. Summary of the Invention

[0005] In order to facilitate scraping the raw material liquid thin and improve the drying and recovery efficiency of the raw material liquid, this application provides a scraper-type thin-film evaporator.

[0006] The scraper-type thin-film evaporator provided by this application adopts the following technical solutions: A scraper-type thin-film evaporator includes a heating cylinder and a scraper. A vertical pipe is rotatably arranged inside the heating cylinder. The center line of the vertical pipe coincides with the center line of the heating cylinder and the vertical pipe rotates relative to the heating cylinder. A connecting plate is fixed between the vertical pipe and the scraper. A scraper is slidably arranged on the scraper. The scraper slides in a direction close to or away from the inner wall of the heating cylinder. The end face of the scraper close to the inner wall of the heating cylinder is inclined. The included angle formed between the inclined surface of the scraper and the inner wall of the heating cylinder is 15° - 30°. A moving component for driving the scraper to move is arranged between the heating cylinder and the scraper.

[0007] By adopting the above technical solution, the scraper can slide in the direction close to or away from the inner wall of the heating tube, and the angle between the inclined surface of the scraper and the inner wall of the heating tube is between 15° and 30°. The position of the scraper, that is, the depth and angle of the scraper into the raw material liquid can be adjusted according to the material conditions. At the same time, moving the position of the scraper also adjusts the gap between the scraper and the inner wall of the heating tube. The angle setting improves the tangential force of the scraper on the material, which is convenient for effectively scraping the high-viscosity raw material liquid thin, thereby improving the material drying and recovery efficiency.

[0008] Optionally, the moving component includes an inner tube, an arc bevel gear ring, an arc bevel gear, a screw and a slider, the inner tube is located inside the vertical tube and the center lines of the two coincide, the inner tube is arranged to rotate relative to the vertical tube, and the arc bevel gear ring is fixed on the outer wall of the inner tube; the connecting plate and the scraper are hollow inside and interconnected, a long hole is opened on the scraper, and the long hole is opened in a direction close to or away from the inner wall of the heating tube, one end of the screw is fixedly connected to the center of the arc bevel gear, and the other end extends into the connecting plate and the scraper and passes through the slider, the slider is threadedly connected to the screw, one end of the slider passes through the long hole and is fixedly connected to the scraper, the slider is slidably set in the long hole along the length direction of the long hole, and the arc bevel gear is meshed with the arc bevel gear ring.

[0009] By adopting the above technical solution, the inner tube rotates relative to the vertical tube, and the rotation of the inner tube is converted into the rotation of the screw through the meshing transmission of the arc bevel gear ring and the arc bevel gear. The screw is threadedly connected to the slider, so that the slider can slide in the long hole in the direction close to or away from the inner wall of the heating tube, thereby driving the scraper to move, achieving precise control of the scraper position, and helping to adjust the distance between the scraper and the inner wall of the heating tube according to the viscosity of the material and other conditions, so as to better scrape the material thinner.

[0010] Optionally, a baffle is fixed to one end of the scraper away from the inner wall of the heating tube, and an edge of the baffle protrudes from the outer surface of the scraper on the side away from the scraper.

[0011] By adopting the above technical solution, the scraper is away from the baffle at one end of the inner wall of the heating tube, and its edge protrudes from the outer surface of the scraper away from the scraper, which can prevent the material from overflowing from the back of the scraper during scraping, ensuring that the material can be effectively confined in the working area of ​​the scraper, thereby improving the scraping effect and the stability of material processing.

[0012] Optionally, a baffle is fixed on the baffle plate, the length direction of the baffle is arranged along the length direction of the long hole, the baffle covers the long hole, and the baffle is slidably arranged relative to the scraper along the length direction of the long hole.

[0013] By adopting the above technical solution, the baffle fixed on the baffle covers the long hole and can slide relative to the scraper along the length direction of the long hole, thereby preventing materials from entering the hollow structure inside the connecting plate and the scraper and the long hole, avoiding materials from clogging or damaging transmission parts such as the screw and slider, thereby extending the service life of the equipment and ensuring the normal operation of the equipment.

[0014] Optionally, a cleaning component is provided on the squeegee. The cleaning component includes a rack, a spur gear, a servo motor, and a scraping bar. The length of the rack is arranged along the length direction of the heating cylinder. The rack is fixed on the squeegee. The output end of the servo motor is fixedly connected to the center of the spur gear. The spur gear meshes with the rack. The servo motor is slidably arranged relative to the squeegee along the length direction of the rack. One end of the scraping bar is fixedly connected to the body of the servo motor, and the other end extends towards the inner wall of the heating cylinder and extends to the inclined surface of the squeegee. The scraping bar is in close contact with the outer wall of the squeegee and is slidably arranged relative to the squeegee.

[0015] By adopting the above technical solution, the rack and the spur gear in the cleaning component cooperate. The servo motor drives the spur gear to rotate, enabling the servo motor to slide relative to the squeegee along the length direction of the spur gear, and then driving the scraping bar to slide on the inclined surface of the squeegee, so as to timely clean the materials adhered to the squeegee, prevent the accumulation of materials from affecting the film scraping effect of the squeegee, and ensure the continuous and efficient operation of the squeegee.

[0016] Optionally, the scraping bar is inclined upward along the direction close to the inner wall of the heating cylinder.

[0017] By adopting the above technical solution, the scraping bar is inclined upward along the direction close to the inner wall of the heating cylinder, which can more effectively scrape the materials off the squeegee and guide the materials to flow in a suitable direction when cleaning the squeegee. When the scraping bar is not in use, it stays at the bottom position of the squeegee along the vertical direction. As the squeegee is used, a part of the raw material liquid is smeared on the inner wall of the heating cylinder, but another part of the raw material liquid will spread to the outer wall of the squeegee and flow downward along the outer wall of the squeegee until it reaches the scraping bar, and is guided by the scraping bar to a suitable position for collection, thereby avoiding mixing with the finished liquid purified through the inner wall of the heating cylinder and ensuring the purity of the finished liquid.

[0018] Optionally, the bottom end of the heating cylinder is in a closed shape and is communicated with a discharge pipe; a collection component is provided at the bottom end of the heating cylinder. The collection component includes a collection hopper and a collection pipe. The collection hopper is in a funnel shape and is arranged parallel to the inner wall of the bottom end of the heating cylinder. The center line of the collection pipe coincides with the center line of the heating cylinder. The top end of the collection pipe is fixedly connected to the bottom of the collection hopper and is communicated with the inside of the collection hopper. The bottom end of the collection pipe penetrates through the discharge pipe and is communicated with the outside; the collection component is slidably arranged relative to the heating cylinder along the center line direction of the heating cylinder.

[0019] By adopting the above technical solution, the bottom end of the heating cylinder is in a closed shape and is connected to the discharge pipe, which facilitates the centralized discharge of the finished liquid flowing down on the inner wall of the heating cylinder. The raw material liquid spreading onto the outer wall of the scraper flows downward along the outer wall of the scraper until it reaches the scraping strip, and is guided by the scraping strip into the collection hopper and discharged through the collection pipe, ensuring the purity of the collected finished liquid. When it is necessary to clean the scraper, move the collection hopper until the outer wall of the collection hopper abuts against the inner wall of the heating cylinder. At this time, move the scraping strip to clean the materials adhered to the scraper, and the cleaned materials are collected into the aggregate hopper, ensuring the purity of the subsequent purification and collection of the raw material liquid.

[0020] Optionally, a spring and a cam are arranged on the outer wall of the collection pipe. The spring is sleeved on the outer wall of the collection pipe, one end of the spring is fixedly connected to the outer wall of the discharge pipe, and the other end is fixedly connected to the outer wall of the collection pipe; the cam is rotatably arranged on the outer wall of the collection pipe, and the outer wall of the cam abuts against the outer wall of the discharge pipe. Rotating the cam is used to stretch the spring to force the collection assembly to slide until the outer wall of the collection hopper abuts against the inner wall of the bottom end of the heating cylinder.

[0021] By adopting the above technical solution, the arrangement of the spring and the cam enables the cam to be rotated to stretch the spring, forcing the collection assembly to slide until the outer wall of the collection hopper abuts against the inner wall of the bottom end of the heating cylinder, realizing flexible adjustment of the position of the collection assembly, enabling the collection hopper to closely fit the bottom end of the heating cylinder, and the heating cylinder transfers heat to the collection hopper, heating the raw material liquid falling on the collection hopper and reducing the occurrence of the phenomenon of raw material heat clogging the collection pipe.

[0022] Optionally, a positioning block is fixedly arranged on the outer wall of the discharge pipe. The outer wall of the positioning block close to the cam is an arc-shaped outer wall and the arc-shaped concave surface faces the cam.

[0023] By adopting the above technical solution, the arc-shaped concave surface on the positioning block enables the cam to be stably placed on the positioning block after rotation, maintaining the state where the outer wall of the collection hopper abuts against the inner wall of the bottom end of the heating cylinder.

[0024] Optionally, a torsion spring for rotating the cam to a vertical state is arranged between the cam and the collection pipe. The vertical state of the cam is the state where the outer wall of the collection hopper abuts against the inner wall of the bottom end of the heating cylinder, and a switching valve is arranged on the collection pipe.

[0025] By adopting the above technical solution, the raw material liquid spreading onto the outer wall of the scraper flows downward along the outer wall of the scraper until it reaches the scraping strip, and is guided by the scraping strip into the collection hopper. In the closed state of the switching valve, as the raw material liquid increases, the collection hopper is gradually pressed down. At this time, the torsion spring drives the cam to rotate, and the operator only needs to observe whether the cam is about to tend to the vertical state to infer that the raw material liquid collected in the collection hopper is about to be full, and then open the switching valve for discharging.

[0026] In summary, the present application includes at least one of the following beneficial technical effects: The scraping knife can slide in a direction close to or away from the inner wall of the heating cylinder. The included angle between its inclined surface and the inner wall of the heating cylinder is between 15° and 30°. The position and angle of the scraping knife can be accurately controlled in cooperation with the moving component, enhancing the tangential force formed, effectively scraping the high-viscosity raw material liquid thinly, and significantly improving the drying and recovery efficiency of the material; The scraping strip is arranged obliquely upward in a direction close to the inner wall of the heating cylinder, which can more effectively scrape the material off the scraping knife and guide the material to drip onto the collection hopper when cleaning the scraping knife. When the scraping strip is not in use, it stays at the bottom position of the scraping knife in the vertical direction. As the scraping knife is used, part of the raw material liquid is smeared on the inner wall of the heating cylinder, but part of the raw material liquid will also spread to the outer wall of the scraping knife and flow downward along the outer wall of the scraping knife until it reaches the scraping strip, and is guided by the scraping strip to the collection hopper for collection, thus avoiding the mixing of the unpurified raw material liquid and the completed liquid purified by the inner wall of the heating cylinder and ensuring the purity of the completed liquid; With the setting of the spring and the cam, rotating the cam can stretch the spring, forcing the collection component to slide until the outer wall of the collection hopper abuts against the inner wall of the bottom end of the heating cylinder, realizing the flexible adjustment of the position of the collection component, enabling the collection hopper to closely fit the bottom end of the heating cylinder, and the heating cylinder to transfer heat to the collection hopper, heating the raw material liquid falling on the collection hopper and reducing the occurrence of the phenomenon of raw material thermal blockage of the collection pipe. Description of the Drawings

[0027] Figure 1 is the structural schematic diagram of the embodiment of the present application; Figure 2 is the top view of the embodiment of the present application; Figure 3 is the partial structural sectional view showing the position of the moving component; Figure 4 is the partial structural sectional view showing the position of the cleaning component; Figure 5 is the partial structural sectional view showing the position of the collection component; Figure 6 is the partial structural schematic diagram of the cam.

[0028] In the figure, 1. Heating cylinder; 11. Connecting plate; 12. Vertical pipe; 13. Discharge pipe; 14. Positioning block; 2. Scraper; 21. Long strip hole; 3. Scraping knife; 31. Baffle; 311. Rectangular strip hole; 32. Stop strip; 4. Moving component; 41. Inner pipe; 42. Spiral bevel gear ring; 43. Spiral bevel gear; 44. Screw; 45. Slide block; 5. Cleaning component; 51. Rack; 52. Straight gear; 53. Servo motor; 54. Scraping strip; 6. Collection component; 61. Collection hopper; 62. Collection pipe; 621. Opening and closing valve; 7. Cam; 71. Torsion spring; 8. Spring; 9. Heating steam jacket. Detailed Embodiment

[0029] The following further elaborates on this application in conjunction with the attached Figures 1 - 6 drawings.

[0030] An embodiment of this application discloses a scraper-type thin-film evaporator.

[0031] Referring to Figure 1 and Figure 2 , a scraper-type thin-film evaporator includes a vertically arranged heating cylinder 1. A vertical pipe 12 is rotatably arranged inside the heating cylinder 1. At the top of the heating cylinder 1, there are a feed port for the raw material liquid, a separation cylinder, and a motor for driving the rotation of the vertical pipe 12. The structure above the heating cylinder 1 is not shown in the existing technology drawings and will not be described in detail either. The heating cylinder 1 can generate heat because a heating steam jacket 9 is fixedly sleeved around the outer wall of the heating cylinder 1.

[0032] Referring to Figure 2 and Figure 3 , a connecting plate 11, a scraper 2, a blade 3, and a moving component 4 are arranged inside the heating cylinder 1. The vertical pipe 12 is vertically arranged and its center line coincides with the center line of the heating cylinder 1. Both the connecting plate 11 and the scraper 2 are horizontally arranged. One end of the connecting plate 11 is fixedly connected to the vertical pipe 12 and the other end is fixedly connected to the scraper 2. The blade 3 is slidably arranged on the scraper 2. One set consists of one connecting plate 11 and one scraper 2, and multiple sets are arranged at intervals along the length direction of the vertical pipe 12. The length direction of the blade 3 is arranged vertically. The blade 3 moves in a direction close to or away from the inner wall of the heating cylinder 1.

[0033] Referring to Figure 3 and Figure 4, the moving component 4 includes an inner tube 41, a spiral bevel gear ring 42, a spiral bevel gear 43, a screw 44 and a slider 45. The inner tube 41 is vertically arranged inside the vertical tube 12 and their center lines coincide. The inner tube 41 is rotatably arranged relative to the vertical tube 12. There are many ways to drive the inner tube 41 to rotate relative to the vertical tube 12. For example, the top of the inner tube 41 extends upward and the inner tube 41 is driven to rotate by a motor. At this time, the motor driving the inner tube 41 to rotate and the motor driving the vertical tube 12 to rotate can be directly misaligned in the vertical direction. If one of the motors is placed horizontally, a gear set can be used for steering. These means are all existing means for personnel in this field to make adaptive adjustments and will not be exemplified and described in detail here. The spiral bevel gear ring 42 is sleeved and fixed on the outer wall of the inner tube 41. Both the connecting plate 11 and the scraper 2 are hollow and communicate with each other. A long strip hole 21 is opened on the scraper 2. The long strip hole 21 is opened along the direction of approaching or departing from the inner wall of the heating cylinder 1, that is, the long strip hole 21 is horizontally opened along the length direction of the scraper 2. The spiral bevel gear 43 meshes with the spiral bevel gear ring 42. One end of the screw 44 is fixedly connected to the center of the spiral bevel gear 43, and the other end extends into the connecting plate 11 and the scraper 2 and penetrates through the slider 45. The slider 45 is threadedly connected to the screw 44. One end of the slider 45 penetrates through the long strip hole 21 and is fixedly connected to the scraping knife 3. The slider 45 is slidably arranged in the long strip hole 21 along the length direction of the long strip hole 21. To make the scraping knife 3 move more stably, multiple groups of moving components 4 are arranged in the vertical direction and are distributed at the positions where the corresponding connecting plates 11 and scrapers 2 are located.

[0034] Reference Figure 3 and Figure 4 , rotate the inner tube 41, the inner tube 41 drives the spiral bevel gear ring 42 to rotate, drives the screw 44 to rotate through the meshing of the spiral bevel gear 43 and the spiral bevel gear ring 42, realizes the sliding of the slider 45 in the long strip hole 21, and finally achieves the effect of adjusting the blade of the scraping knife 3 to approach or depart from the inner wall of the heating cylinder 1, and adjusts the gap between the scraping knife 3 and the heating cylinder 1.

[0035] Reference Figure 3 and Figure 5, one end face of the scraping blade 3 close to the inner wall of the heating cylinder 1 is inclined, and the included angle formed between the inclined surface of the scraping blade 3 and the inner wall of the heating cylinder 1 is 15° - 30°. A baffle 31 is fixed at one end of the scraping blade 3 away from the inner wall of the heating cylinder 1. The edge of the baffle 31 protrudes from the outer surface of the side of the scraping blade 3 facing away from the scraping plate 2. A retaining strip 32 is fixed on the side of the baffle 31 facing away from the scraping blade 3. The length direction of the retaining strip 32 is arranged along the length direction of the long strip hole 21. The retaining strip 32 covers the long strip hole 21. The retaining strip 32 is slidably arranged relative to the scraping plate 2 along the length direction of the long strip hole 21. The number of the retaining strips 32 is set corresponding to the number of the long strip holes 21. The length direction of the baffle 31 is arranged vertically and the length is the same as that of the scraping blade 3. The inside of the baffle 31 is hollow. A rectangular strip hole 311 is opened on the baffle 31. The rectangular strip hole 311 is opened along the length direction of the baffle 31 and is on the same side wall of the baffle 31 as the retaining strip 32.

[0036] Reference Figure 3 and Figure 4 , a cleaning assembly 5 is arranged on the scraping blade 3. The cleaning assembly 5 includes a rack 51, a spur gear 52, a servo motor 53 and a scraping strip 54. The length of the rack 51 is arranged along the length direction of the heating cylinder 1. The rack 51 is fixed on the scraping blade 3. Specifically, the rack 51 is fixed on the inner wall of the baffle 31. The servo motor 53 is located inside the baffle 31. The output end of the servo motor 53 is fixedly connected to the center of the spur gear 52. The spur gear 52 meshes with the rack 51. The servo motor 53 is slidably arranged relative to the scraping blade 3 along the length direction of the rack 51, that is, the outer wall of the body of the servo motor 53 is in sliding contact with the inner wall of the baffle 31. One end of the scraping strip 54 is fixedly connected to the body of the servo motor 53, and the other end passes through the rectangular strip hole 311 and then extends towards the inner wall of the heating cylinder 1 and extends to the inclined surface of the scraping blade 3. The scraping strip 54 is arranged obliquely upward along the direction close to the inner wall of the heating cylinder 1. The scraping strip 54 is closely attached to the outer wall of the scraping blade 3 and is slidably arranged relative to the scraping blade 3 in the vertical direction. It is also possible to arrange the top of the baffle 31 to protrude from the top of the scraping blade 3 in the vertical direction, so as to facilitate the inclined scraping strip 54 to completely sweep the surface of the corresponding scraping blade 3.

[0037] Reference Figure 5 and Figure 6 , the bottom end of the heating cylinder 1 is in a necked-in shape and is communicated with a discharge pipe 13. The discharge pipe 13 first extends downward and then extends horizontally for a certain distance. A positioning block 14 is fixed on the outer wall of the discharge pipe 13. The bottom surface of the positioning block 14 is arc-shaped and the arc-shaped concave surface is arranged downward.

[0038] Reference Figure 5 and Figure 6, a collection component 6 is provided at the bottom end of the heating cylinder 1. The collection component 6 includes a collection hopper 61 and a collection pipe 62. The collection hopper 61 is located inside the heating cylinder 1 and below the vertical pipe 12. The collection hopper 61 is funnel-shaped and arranged parallel to the inner wall of the bottom end of the heating cylinder 1. The center line of the collection pipe 62 coincides with the center line of the heating cylinder 1. The top end of the collection pipe 62 is fixed to the bottom of the collection hopper 61 and is in communication with the inside of the collection hopper 61. The bottom end of the collection pipe 62 penetrates through the turning point of the discharge pipe 13 and communicates with the outside. An opening and closing valve 621 is provided on the collection pipe 62, and the opening and closing valve 621 is located below the discharge pipe 13. The collection component 6 is slidably arranged relative to the heating cylinder 1 along the center line direction of the heating cylinder 1, that is, slidably arranged vertically. A spring 8 and a cam 7 are provided on the outer wall of the collection pipe 62. The spring 8 is sleeved on the outer wall of the collection pipe 62. One end of the spring 8 is fixedly connected to the outer wall of the discharge pipe 13, and the other end is fixedly connected to the outer wall of the collection pipe 62. The cam 7 is rotatably arranged on the outer wall of the collection pipe 62, and the outer wall of the cam 7 abuts against the outer wall of the positioning block 14. By rotating the cam 7, the spring 8 is stretched to force the collection component 6 to slide vertically until the outer wall of the collection hopper 61 abuts against the inner wall of the bottom end of the heating cylinder 1.

[0039] Reference Figure 6 , a torsion spring 71 is provided between the cam 7 and the collection pipe 62. One end of the torsion spring 71 is fixedly connected to the outer wall of the cam 7, and the other end is fixedly connected to the outer wall of the collection pipe 62. The torsion spring 71 is wound around the rotating shaft formed by the cam 7 and the collection pipe 62. The vertical state of the cam 7 is the state where the outer wall of the collection hopper 61 abuts against the inner wall of the bottom end of the heating cylinder 1.

[0040] The implementation principle of the scraper type thin film evaporator in the embodiment of the present application is as follows: Rotate the inner pipe 41, the inner pipe 41 drives the arc tooth bevel gear ring 42 to rotate, and drives the screw 44 to rotate through the meshing of the arc tooth bevel gear 43 and the arc tooth bevel gear ring 42, so as to realize the sliding of the slider 45 in the long slot 21. Finally, the distance between the cutting edge of the scraper 3 and the inner wall of the heating cylinder 1 is adjusted. After the raw material liquid is added tangentially from the upper part of the heating cylinder 1, under the action of gravity and the driving of the rotating scraper 3, a downward rotating thin film is formed along the inner wall surface of the shell. The liquid is gathered and discharged through the discharge pipe 13. The speed of the scraper 3 can reach 10 meters per second. Throughout the process, the scraping strip 54 always follows the scraper 3 and is always located at the bottom of the scraper 3. When it is necessary to clean the materials adhered to the scraper 3, rotate the cam 7 to make the outer wall of the collection hopper 61 abut against the inner wall of the bottom end of the heating cylinder 1, and start the servo motor 53 to make the scraping strip 54 clean the outer wall of the scraper 3 from bottom to top. The cleaned materials fall on the collection hopper 61 and are discharged through the collection pipe 62.

[0041] The embodiments of the present specific implementation manners are all preferred embodiments of the present application, and do not limit the protection scope of the present application accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A scraper-type thin film evaporator, comprising a heating tube (1) and a scraper (2), characterized in that: A vertical tube (12) is rotatably arranged inside the heating tube (1), the center line of the vertical tube (12) coincides with the center line of the heating tube (1) and the vertical tube (12) rotates relative to the heating tube (1), and a connecting plate (11) is fixed between the vertical tube (12) and the scraper (2); a scraper (3) is slidably arranged on the scraper (2), and the scraper (3) slides in a direction approaching or moving away from the inner wall of the heating tube (1), and the end surface of the scraper (3) close to the inner wall of the heating tube (1) is inclined, and the angle formed between the inclined surface of the scraper (3) and the inner wall of the heating tube (1) is 15°-30°; a moving component (4) for driving the scraper (3) to move is arranged between the heating tube (1) and the scraper (3).

2. A scraped film evaporator according to claim 1, characterized in that: The moving assembly (4) comprises an inner tube (41), an arc-tooth bevel gear ring (42), an arc-tooth bevel gear (43), a screw (44) and a slider (45); the inner tube (41) is located inside the vertical tube (12) and the center lines of the two coincide with each other; the inner tube (41) is arranged to rotate relative to the vertical tube (12); the arc-tooth bevel gear ring (42) is annularly fixed on the outer wall of the inner tube (41); the connection plate (11) and the scraper (2) are both hollow inside and are interconnected; the scraper (2) is provided with a long hole (21) and the long hole (21) is arranged along the vertical tube (12) near the vertical tube (12); Or it is opened in a direction away from the inner wall of the heating tube (1), one end of the screw rod (44) is fixedly connected to the center of the arc bevel gear (43), and the other end extends into the interior of the connecting plate (11) and the scraper (2) and passes through the slider (45), the slider (45) is threadedly connected to the screw rod (44), one end of the slider (45) passes through the long hole (21) and is fixedly connected to the scraper (3), the slider (45) is slidably arranged in the long hole (21) along the length direction of the long hole (21), and the arc bevel gear (43) is meshed with the arc bevel gear ring (42).

3. A scraped film evaporator according to claim 2, characterized in that: A baffle (31) is fixed to one end of the scraper (3) away from the inner wall of the heating tube (1), and the edge of the baffle (31) protrudes from the outer surface of the scraper (3) on the side away from the scraper (2).

4. A scraped film evaporator according to claim 3, characterized in that: A baffle (32) is fixed on the baffle plate (31), the length direction of the baffle (32) is arranged along the length direction of the long hole (21), the baffle (32) covers the long hole (21), and the baffle (32) is slidably arranged relative to the scraper (2) along the length direction of the long hole (21).

5. The scraped film evaporator according to claim 1, characterized in that: The scraper (3) is provided with a cleaning assembly (5), the cleaning assembly (5) comprising a rack (51), a spur gear (52), a servo motor (53) and a scraper strip (54); the length of the rack (51) is arranged along the length direction of the heating tube (1); the rack (51) is fixed on the scraper (3); the output end of the servo motor (53) is fixedly connected to the center of the spur gear (52); the spur gear (52) is meshed with the rack (51); the servo motor (53) is slidably arranged along the length direction of the rack (51) relative to the scraper (3); one end of the scraper strip (54) is fixedly connected to the body of the servo motor (53); the other end extends toward the inner wall of the heating tube (1) and extends to the inclined surface of the scraper (3); the scraper strip (54) is closely attached to the outer wall of the scraper (3) and is slidably arranged relative to the scraper (3).

6. A scraped film evaporator according to claim 5, characterized in that: The scraper strip (54) is arranged obliquely upward in a direction close to the inner wall of the heating tube (1).

7. The scraped film evaporator according to claim 5, characterized in that: The bottom end of the heating tube (1) is closed and connected to a discharge pipe (13); a collecting assembly (6) is provided at the bottom end of the heating tube (1), and the collecting assembly (6) comprises a collecting bucket (61) and a collecting pipe (62); the collecting bucket (61) is funnel-shaped and is arranged parallel to the inner wall of the bottom end of the heating tube (1); the center line of the collecting pipe (62) coincides with the center line of the heating tube (1); the top end of the collecting pipe (62) is fixed to the bottom of the collecting bucket (61) and is connected to the inside of the collecting bucket (61); the bottom end of the collecting pipe (62) passes through the discharge pipe (13) and is connected to the outside; the collecting assembly (6) is arranged to slide relative to the heating tube (1) along the center line direction of the heating tube (1).

8. A scraped film evaporator according to claim 7, characterized in that: A spring (8) and a cam (7) are provided on the outer wall of the collecting tube (62); the spring (8) is sleeved on the outer wall of the collecting tube (62); one end of the spring (8) is fixedly connected to the outer wall of the discharge tube (13), and the other end is fixedly connected to the outer wall of the collecting tube (62); the cam (7) is rotatably provided on the outer wall of the collecting tube (62); the outer wall of the cam (7) abuts against the outer wall of the discharge tube (13); the rotating cam (7) is used to stretch the spring (8) to force the collecting assembly (6) to slide until the outer wall of the collecting bucket (61) abuts against the inner wall of the bottom end of the heating tube (1).

9. A scraped film evaporator according to claim 8, characterized in that: A positioning block (14) is fixed to the outer wall of the discharge pipe (13); the outer wall of the positioning block (14) close to the cam (7) is an arc-shaped outer wall, and the arc-shaped concave surface is arranged toward the cam (7).

10. The scraped film evaporator according to claim 9, characterized in that: A coil spring (71) is provided between the cam (7) and the collecting tube (62) for rotating the cam (7) to a vertical state. The vertical state of the cam (7) is a state in which the outer wall of the collecting bucket (61) abuts against the inner wall of the bottom end of the heating tube (1). An opening and closing valve (621) is provided on the collecting tube (62).

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