NMP recycling waste liquid high-efficiency distillation purification device

Abstract

The application relates to the technical field of waste liquid recovery, in particular to a high-efficiency distillation and purification device for NMP recovery waste liquid, which comprises an evaporation cylinder, a scraper mechanism is arranged on the surface of the evaporation cylinder, the scraper mechanism comprises a first motor, the first motor is fixedly connected on the surface of the evaporation cylinder, a pressure adjusting mechanism is arranged in the inside of a liquid distribution cylinder, an angle adjusting mechanism is arranged in the inside of the liquid distribution cylinder, and a gap adjusting mechanism is arranged in the inside of the liquid distribution cylinder. The pressure adjusting mechanism can flexibly adjust the pressure of the scraper body on the inner wall of the evaporation cylinder according to the value of the pressure sensor. The problems that the scraper body is excessively pressed to cause the inner wall of the evaporation cylinder to be excessively abraded and the pressure is excessively small to affect the distillation and purification effect are avoided, the pressure of the scraper body is always stable, the NMP recovery efficiency is improved, the abrasion of the equipment is reduced, and the service life of the scraper body, the evaporation cylinder and other components is prolonged.

Description

Technical Field

[0001] This invention relates to the field of waste liquid recycling technology, specifically to a high-efficiency distillation and purification device for NMP waste liquid recycling. Background Technology

[0002] NMP is a highly polar, high-boiling-point organic solvent that is widely used in electronics manufacturing, coatings, pesticides, pharmaceuticals and other fields. In industrial production, NMP is often used to dissolve or clean polymer materials (such as polyimide, polyamide and so on), and will form NMP waste liquid containing impurities after use.

[0003] In existing NMP waste liquid distillation and purification technologies, multi-effect evaporation or thin-film evaporation technologies are widely used to improve distillation efficiency and reduce energy consumption. Meanwhile, waste heat recovery systems also optimize heat energy utilization to some extent. Among these, spiral tube evaporators and rotary scraper evaporators have become the mainstream equipment choices due to their suitability for purifying high-viscosity, impurity-containing NMP waste liquids.

[0004] In practical applications, existing rotary scraper evaporators struggle to precisely control the pressure between the scraper and the evaporation wall. Insufficient pressure prevents the formation of a uniform and appropriately thick liquid film on the evaporation wall, resulting in a reduced evaporation area, low evaporation efficiency, and potential incomplete evaporation of some waste liquid, leading to a decrease in NMP recovery rate. Conversely, excessive pressure increases friction between the scraper and the evaporation wall, accelerating wear, shortening equipment lifespan, consuming more energy, and increasing operating costs. Furthermore, excessive pressure can cause the liquid film to be too thin, even resulting in dry walls, making the evaporation process unstable, generating localized overheating, and affecting NMP quality, potentially leading to NMP decomposition or impurities. Existing high-efficiency distillation and purification devices for NMP waste liquid recovery have relatively fixed scraper pressure, making it impossible to flexibly adjust the scraper pressure. This results in a failure to balance waste liquid recovery rate and equipment lifespan. Therefore, there is an urgent need to design a high-efficiency distillation and purification device for NMP waste liquid recovery to solve these problems. Summary of the Invention

[0005] The purpose of this invention is to provide a high-efficiency distillation and purification device for NMP waste liquid recovery, in order to solve the problem mentioned in the background art that the scraper extrusion pressure of the existing high-efficiency distillation and purification devices for NMP waste liquid recovery is relatively fixed, and the extrusion pressure of the scraper cannot be flexibly adjusted, resulting in the equipment being unable to balance the waste liquid recovery rate and the service life of the equipment.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A high-efficiency distillation and purification device for NMP waste liquid recovery: comprising an evaporation cylinder, a heating device disposed on the surface of the evaporation cylinder, a feed inlet fixedly connected to the top of the evaporation cylinder, a discharge outlet fixedly connected to the bottom of the evaporation cylinder, a scraper mechanism disposed on the surface of the evaporation cylinder, the scraper mechanism comprising a first motor fixedly connected to the surface of the evaporation cylinder, a drive shaft fixedly connected to the output shaft of the first motor, a scraper rod fixedly connected to the bottom of the drive shaft, a lifting ring slidably connected to the surface of the scraper rod, and an adjusting rod rotatably connected to the surface of the lifting ring, the adjusting rod being moved away from the lifting ring. A connecting rod is rotatably connected to one end of the descending ring. A guide rod is slidably connected to the surface of the connecting rod. A scraper bracket is fixedly connected to the surface of the guide rod. A scraper body is rotatably mounted on the surface of the scraper bracket. A first spring is fixedly connected between the connecting rod and the scraper bracket. A pressure sensor is fixedly connected to the surface of the connecting rod. The output end of the pressure sensor is fixedly connected to the surface of the scraper bracket. A liquid separator is fixedly connected inside the evaporation cylinder. A material limiting baffle is slidably mounted inside the evaporation cylinder. A pressure adjustment mechanism, an angle adjustment mechanism, and a gap adjustment mechanism are all installed inside the liquid separator.

[0007] Preferably, the pressure adjustment mechanism includes a bidirectional screw, which is rotatably connected to the surface of the liquid separator. A square nut is threaded onto the surface of the liquid separator, and a first lifting rod is fixedly connected to the bottom of the square nut. A second motor is fixedly connected inside the liquid separator, and a worm gear is fixedly connected to the output shaft of the second motor. A first gear is fixedly connected to the bottom of the bidirectional screw, and a second gear is rotatably connected to the surface of the liquid separator. A worm gear is fixedly connected to the top of the second gear, and a rotating ring is fixedly connected to the bottom of the first lifting rod. The rotating ring is rotatably connected to the surface of the lifting ring.

[0008] Preferably, the gap adjustment mechanism includes a guide cylinder, a second spring fixedly connected to the surface of the guide cylinder, a second lifting rod fixedly connected to the surface of the second spring, the bottom of the second lifting rod fixedly connected to the top of the material limiting baffle, the second lifting rod slidably connected to the surface of the guide cylinder, a linkage plate fixedly connected to the bottom of the material limiting baffle, a third motor fixedly connected to the surface of the liquid separating cylinder, a first rotating shaft fixedly connected to the output shaft of the third motor, and a support rod fixedly connected to the surface of the first rotating shaft.

[0009] Preferably, the angle adjustment mechanism includes a second rotating shaft, which is rotatably connected to the surface of the scraper bracket. The scraper body is fixedly connected to the surface of the second rotating shaft. A torsion spring is fixedly connected between the second rotating shaft and the scraper body. A fine-tuning rod is fixedly connected to the top of the second rotating shaft. A linkage bearing is fixedly connected to the surface of the drive rotating shaft. A crossbar is fixedly connected to the rotating end of the linkage bearing. A bottom rod is fixedly connected to the bottom of the first rotating shaft. A linkage column is fixedly connected to the bottom of the bottom rod. The linkage column is inserted into one end of the crossbar. The rotating end of the linkage bearing is rotatably disposed at the end of the material limiting baffle away from the second rotating shaft.

[0010] Preferably, the first motor drives the drive shaft to rotate via the output shaft, and the drive shaft drives the scraper rod to rotate synchronously. The scraper rod drives the scraper body to rotate on the inner wall of the evaporation cylinder via the lifting ring. The scraper rod has protrusions on its surface, and the lifting ring has grooves that fit the protrusions. There are two sets of adjusting rods, and the two sets of adjusting rods support the scraper bracket and the scraper body on the lifting ring via connecting rods. The elastic force of the first spring acts on the scraper bracket and the connecting rods, and the scraper bracket presses the scraper body against the inner wall of the evaporation cylinder.

[0011] Preferably, the worm and the worm wheel mesh with each other, the first gear and the second gear mesh with each other, the second motor drives the worm to rotate through the output shaft, the worm drives the second gear to rotate through the worm wheel, and the second gear drives the bidirectional screw to rotate through the first gear.

[0012] Preferably, the bidirectional screw drives the square nut to move horizontally up and down inside the liquid separator by rotation. The square nut drives the first lifting rod to move horizontally up and down synchronously. The first lifting rod drives the lifting ring to move horizontally up and down on the scraper rod through the rotating ring. During the lifting process, the lifting ring changes the angle of the adjusting rod on the connecting rod side.

[0013] Preferably, the limiting baffle slides and rises inside the evaporation cylinder via a guide cylinder and a second spring. The elastic force of the second spring acts on the limiting baffle through the second lifting rod. The limiting baffle is generally horn-shaped, and the linkage plate is generally arc-shaped with a high center and low sides. The third motor drives a first rotating shaft to rotate via an output shaft. The first rotating shaft drives a support rod to rotate synchronously, and the support rod is in contact with the surface of the linkage plate.

[0014] Preferably, the scraper body rotates on the surface of the scraper bracket via a second rotating shaft, the elastic force of the torsion spring acts on the scraper body, the crossbar rotates on the drive shaft via the rotating end of the linkage bearing, a circular hole is provided on the surface of the crossbar, the bottom rod is inserted into the circular hole of the crossbar, and the bottom rod rotates synchronously via a first rotating shaft.

[0015] Preferably, during the rotation of the bottom rod, the linkage column is driven to rotate, the linkage column drives the crossbar to rotate on the surface of the drive shaft, the crossbar drives the rotating end of a linkage bearing to rotate, and the rotating end of the linkage bearing drives the second shaft to rotate through the fine-tuning rod, and the second shaft drives the scraper body to rotate synchronously on the scraper bracket.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. This distillation and purification device, through a pressure adjustment mechanism, can flexibly adjust the pressure of the scraper body on the inner wall of the evaporation cylinder based on the values ​​of the pressure sensor. This avoids the problems of excessive pressure on the scraper body leading to accelerated wear against the inner wall of the evaporation cylinder, and insufficient pressure affecting the distillation and purification effect. It ensures that the pressure of the scraper body remains stable, which improves NMP recovery efficiency, reduces equipment wear, and extends the service life of components such as the scraper body and the evaporation cylinder.

[0018] 2. This distillation and purification device uses a third motor to drive the first rotating shaft to rotate, changing the position of the support rod at the bottom of the linkage plate. This adjusts the gap between the separator and the limiting baffle, controlling the feeding speed. The first rotating shaft drives the bottom rod to rotate, causing the linkage column to rotate the crossbar. This, in turn, drives the second rotating shaft to rotate via the rotating end of the linkage bearing and the fine-tuning rod, changing the angle of the scraper body. Through coordinated control, it can be flexibly adjusted according to the different properties of NMP recovery waste liquid. For high-viscosity waste liquid, the feeding speed can be reduced and the scraper body angle adjusted to adapt to its flowability; for low-viscosity waste liquid, the feeding speed can be appropriately increased and the scraper body angle adjusted to improve processing efficiency. This significantly improves the distillation and purification effect and the device's adaptability to different waste liquids. Attached Figure Description

[0019] Figure 1 This is a frontal perspective view of the structure of the present invention;

[0020] Figure 2 This is a frontal cross-sectional perspective view of the evaporator cylinder structure of the present invention;

[0021] Figure 3 This is a frontal cross-sectional perspective view of the bottom structure of the drive shaft of the present invention;

[0022] Figure 4 This is a frontal perspective three-dimensional schematic diagram of the connecting rod structure of the present invention;

[0023] Figure 5 This is a three-dimensional schematic diagram of the material limiting baffle structure of the present invention, including front view, bottom view, and cross-sectional view.

[0024] Figure 6 This is a three-dimensional schematic diagram of the liquid separator structure of the present invention, shown from the side, bottom, and cross-section.

[0025] Figure 7 This is a frontal cross-sectional perspective view of the relative positions of the liquid separator and the material limiting baffle of the present invention.

[0026] Figure 8 For the present invention Figure 2 Enlarged structural diagram at point A;

[0027] Figure 9 For the present invention Figure 4 Enlarged structural diagram at point B;

[0028] Figure 10 For the present invention Figure 6 Enlarged structural diagram at point C;

[0029] Figure 11 This is a frontal sectional perspective view of the scraper rod structure of the present invention;

[0030] Figure 12 This is a frontal sectional perspective view of the top and structure of the scraper bracket of the present invention.

[0031] In the diagram: 1. Evaporation cylinder; 11. Heating equipment; 12. Feed inlet; 13. Discharge outlet; 2. First motor; 21. Drive shaft; 22. Scraper rod; 23. Adjusting rod; 24. Connecting rod; 25. Guide rod; 26. Scraper bracket; 27. Scraper body; 28. First spring; 29. ​​Pressure sensor; 210. Lifting ring; 3. Separating cylinder; 31. Bidirectional screw; 32. Square nut; 33. First lifting rod; 4. Second motor; 35. Worm gear; 36. First gear; 37. Worm wheel; 38. Second gear; 39. Rotating ring; 4. Guide cylinder; 41. Second spring; 42. Second lifting rod; 43. Material limiting baffle; 44. Linkage plate; 45. Third motor; 46. First rotating shaft; 47. Support rod; 5. Second rotating shaft; 51. Torsion spring; 53. Fine-tuning rod; 54. Linkage bearing; 55. Crossbar; 56. Bottom rod; 57. Linkage column. Detailed Implementation

[0032] 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 embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Please see Figure 1-12 One embodiment provided by the present invention:

[0034] A high-efficiency distillation and purification device for NMP waste liquid recovery includes an evaporation cylinder 1, a heating device 11 on the surface of the evaporation cylinder 1, a feed inlet 12 fixedly connected to the top of the evaporation cylinder 1, a discharge outlet 13 fixedly connected to the bottom of the evaporation cylinder 1, and a scraper mechanism on the surface of the evaporation cylinder 1. The scraper mechanism includes a first motor 2, which is fixedly connected to the surface of the evaporation cylinder 1. A drive shaft 21 is fixedly connected to the output shaft of the first motor 2, and a scraper rod 22 is fixedly connected to the bottom of the drive shaft 21. A lifting ring 210 is slidably connected to the surface of the scraper rod 22, and an adjusting rod 23 is rotatably connected to the surface of the lifting ring 210. A connecting rod 24 is rotatably connected to the end of the adjusting rod 23 away from the lifting ring 210, and a guide rod 25 is slidably connected to the surface of the connecting rod 24. A scraper bracket 26 is fixedly connected, and a scraper body 27 is rotatably mounted on the surface of the scraper bracket 26. A first spring 28 is fixedly connected between the connecting rod 24 and the scraper bracket 26. A pressure sensor 29 is fixedly connected to the surface of the connecting rod 24, and the output end of the pressure sensor 29 is fixedly connected to the surface of the scraper bracket 26. A liquid separator 3 is fixedly connected inside the evaporation cylinder 1. A limiting baffle 43 is slidably mounted inside the evaporation cylinder 1. A pressure adjustment mechanism, an angle adjustment mechanism, and a gap adjustment mechanism are all installed inside the liquid separator 3. The distillation and purification device heats the inside of the evaporation cylinder 1 through the heating device 11. After the NMP recovery waste liquid enters the evaporation cylinder 1, it is distilled and purified by the rotation of the scraper body 27.

[0035] Furthermore, the pressure adjustment mechanism includes a bidirectional screw 31, which is rotatably connected to the surface of the liquid separator 3. A square nut 32 is threaded onto the surface of the liquid separator 3, and a first lifting rod 33 is fixedly connected to the bottom of the square nut 32. A second motor 34 is fixedly connected inside the liquid separator 3, and a worm gear 35 is fixedly connected to the output shaft of the second motor 34. A first gear 36 is fixedly connected to the bottom of the bidirectional screw 31, and a second gear 38 is rotatably connected to the surface of the liquid separator 3. A worm gear 37 is fixedly connected to the top of the second gear 38, and a rotating ring 39 is fixedly connected to the bottom of the first lifting rod 33. The rotating ring 39 is rotatably connected to the surface of the lifting ring 210. This pressure adjustment mechanism can flexibly adjust the pressure of the scraper body 27 on the inner wall of the evaporation cylinder 1, thereby ensuring that the pressure of the scraper body 27 remains stable. This ensures the efficiency of recovery, avoids severe wear, and extends the service life of the equipment.

[0036] Furthermore, the gap adjustment mechanism includes a guide cylinder 4, a second spring 41 fixedly connected to the surface of the guide cylinder 4, a second lifting rod 42 fixedly connected to the surface of the second spring 41, the bottom of the second lifting rod 42 fixedly connected to the top of the limiting baffle 43, the second lifting rod 42 slidably connected to the surface of the guide cylinder 4, a linkage plate 44 fixedly connected to the bottom of the limiting baffle 43, a third motor 45 fixedly connected to the surface of the liquid separating cylinder 3, a first rotating shaft 46 fixedly connected to the output shaft of the third motor 45, and a support rod 47 fixedly connected to the surface of the first rotating shaft 46. A gap for feeding is generated between the liquid separating cylinder 3 and the limiting baffle 43, and the feeding speed is controlled by the size of the gap. Controlling the feeding speed can ensure that the waste liquid has sufficient residence time in the evaporation zone.

[0037] Furthermore, the angle adjustment mechanism includes a second rotating shaft 5, which is rotatably connected to the surface of the scraper support 26. The scraper body 27 is fixedly connected to the surface of the second rotating shaft 5. A torsion spring 51 is fixedly connected between the second rotating shaft 5 and the scraper body 27. A fine-tuning rod 53 is fixedly connected to the top of the second rotating shaft 5. A linkage bearing 54 is fixedly connected to the surface of the drive rotating shaft 21. A crossbar 55 is fixedly connected to the rotating end of the linkage bearing 54. A bottom rod 56 is fixedly connected to the bottom of the first rotating shaft 46. A linkage column 57 is fixedly connected to the bottom of the bottom rod 56. The linkage column 57 is inserted into one end of the crossbar 55. The end of the limiting baffle 43 away from the second rotating shaft 5 is rotatably set with the rotating end of the linkage bearing 54. Its angle adjustment mechanism can simultaneously control the angle of multiple scraper bodies 27 on the scraper support 26. By controlling the angle of the scraper bodies 27, the flow path and residence time of the waste liquid can be optimized.

[0038] Furthermore, the first motor 2 drives the drive shaft 21 to rotate via its output shaft. The drive shaft 21 drives the scraper rod 22 to rotate synchronously. The scraper rod 22 drives the scraper body 27 to rotate on the inner wall of the evaporation cylinder 1 via the lifting ring 210. The surface of the scraper rod 22 is provided with protrusions, and the lifting ring 210 is provided with grooves that fit the protrusions, ensuring that the lifting ring 210 can rotate normally. This allows the lifting ring 210 to drive the scraper body 27 on one side to rotate. The adjusting rod 23 is provided in two sets, and the two sets of adjusting rods... 23 The scraper bracket 26 and scraper body 27 are supported on the lifting ring 210 by the connecting rod 24. The elastic force of the first spring 28 acts on the scraper bracket 26 and the connecting rod 24. The scraper bracket 26 presses the scraper body 27 against the inner wall of the evaporation cylinder 1, ensuring the stability of the connecting rod 24, the adjusting rod 23 and the scraper bracket 26 in the internal structure of the evaporation cylinder 1. There are multiple sets of scraper bodies 27. The wear of multiple sets of scraper bodies 27 is basically the same, so the pressure adjustment of the scraper body 27 is consistent.

[0039] Furthermore, the worm 35 and worm wheel 37 mesh with each other, and the first gear 36 and the second gear 38 mesh with each other. The second motor 34 drives the worm 35 to rotate through the output shaft. The worm 35 drives the second gear 38 to rotate through the worm wheel 37. The second gear 38 drives the bidirectional screw 31 to rotate through the first gear 36. There are two sets of bidirectional screws 31, and the rotation directions of the two sets of bidirectional screws 31 are opposite. The first gear 36 and the second gear 38 adjust the transmission position of the worm 35 and the second gear 38 inside the liquid separator 3, so that the worm 35 can maintain a misaligned relationship with the drive shaft 21, thereby realizing the simultaneous driving of the two sets of bidirectional screws 31.

[0040] Furthermore, the bidirectional screw 31 drives the square nut 32 to move horizontally up and down inside the liquid separator 3 by rotation. The square nut 32 drives the first lifting rod 33 to move horizontally up and down synchronously. The first lifting rod 33 drives the lifting ring 210 to move horizontally up and down on the scraper rod 22 through the rotating ring 39. During the lifting process, the lifting ring 210 changes the angle of the adjusting rod 23 on the side of the connecting rod 24. At this time, the position of the connecting rod 24 changes, while the position of the scraper body 27 on the side wall of the evaporation cylinder 1 is relatively fixed. This allows the preload of the first spring 28 between it and the scraper bracket 26 to be adjusted, thereby adjusting the squeezing force of the scraper body 27 on the inner wall of the evaporation cylinder 1. When controlling the squeezing force of the scraper body 27, it can be flexibly and automatically adjusted according to the pressure value given by the pressure sensor 29.

[0041] Furthermore, the pressure sensor 29 monitors the pressure on the scraper support 26 in real time and converts the pressure signal into an electrical signal. This electrical signal is transmitted to the control system of the device (a common PLC control system can be used). The control system presets the optimal pressure range of the scraper body 27 on the inner wall of the evaporator cylinder 1. When the pressure value fed back by the pressure sensor 29 is lower than the lower limit of this range, the control system will send a command to the second motor 34 to increase the preload between the first spring 28 and the scraper support 26, thereby increasing the squeezing force of the scraper body 27 on the inner wall of the evaporator cylinder 1.

[0042] Conversely, when the pressure value fed back by the pressure sensor 29 is higher than the upper limit of the optimal pressure range, the control system will control the second motor 34 to rotate in the opposite direction, and make the bidirectional screw 31 rotate in the opposite direction according to the above transmission sequence, and the square nut 32 descends horizontally, ultimately reducing the squeezing force of the scraper body 27 on the inner wall of the evaporation cylinder 1 until the pressure returns to the optimal range.

[0043] Furthermore, the limiting baffle 43 slides and rises and falls inside the evaporation cylinder 1 via the guide cylinder 4 and the second spring 41. The elastic force of the second spring 41 acts on the limiting baffle 43 through the second lifting rod 42. The limiting baffle 43 is generally funnel-shaped, and the linkage plate 44 is generally arc-shaped, with a higher center and lower sides. The third motor 45 drives the first rotating shaft 46 to rotate through the output shaft. The first rotating shaft 46 drives the support rod 47 to rotate synchronously. The support rod 47 is in contact with the surface of the linkage plate 44. Since the linkage plate 44 is generally arc-shaped, with a higher center and lower sides, when the worm gear 37 is located on both sides of the linkage plate 44, the worm gear 37... 7. The support height of the limiting baffle 43 by the linkage plate 44 is reduced, thereby reducing the gap between the liquid separator 3 and the limiting baffle 43. At this time, the gap between the liquid separator 3 and the limiting baffle 43 becomes larger, increasing the liquid inlet volume. Conversely, it can also reduce the gap between the liquid separator 3 and the limiting baffle 43. The feed inlet 12 on one side of the evaporator 1 extends into the interior of the evaporator 1, which can steadily pour the waste liquid into the position between the liquid separator 3 and the limiting baffle 43. The bottom of the second lifting rod 42 contacts the inner wall of the evaporator 1, so that the waste liquid flows from the gap between the liquid separator 3 and the limiting baffle 43 to the inner wall of the evaporator 1.

[0044] Furthermore, the scraper body 27 rotates on the surface of the scraper bracket 26 via the second rotating shaft 5. The elastic force of the torsion spring 51 acts on the scraper body 27, ensuring the stability of the scraper body 27 during rotation. The crossbar 55 rotates on the drive shaft 21 via the rotating end of the linkage bearing 54. A circular hole is provided on the surface of the crossbar 55. The bottom rod 56 is inserted into the circular hole of the crossbar 55. The bottom rod 56 rotates synchronously via the first rotating shaft 46.

[0045] Furthermore, during the rotation of the bottom rod 56, the linkage column 57 is driven to rotate, and the linkage column 57 drives the crossbar 55 to rotate on the surface of the drive shaft 21. The crossbar 55 drives the rotating end of the linkage bearing 54 to rotate, and the rotating end of the linkage bearing 54 drives the second shaft 5 to rotate through the fine-tuning rod 53. The second shaft 5 drives the scraper body 27 to rotate synchronously on the scraper support 26, thereby changing the angle of the scraper body 27. Meanwhile, during the search process, the first shaft 46 simultaneously changes the angle of the scraper body 27 and the gap between the liquid separator 3 and the limiting baffle 43, thereby achieving coordinated control of the feeding speed and the angle of the scraper body 27.

[0046] Working principle: The pressure value of the scraper body 27 is adjusted based on the pressure value provided by the pressure sensor 29. The output shaft of the second motor 34 drives the worm 35 to rotate. The worm 35 drives the second gear 38 to rotate via the worm wheel 37. The second gear 38 drives the bidirectional screw 31 to rotate via the first gear 36. The bidirectional screw 31 drives the square nut 32 to move horizontally up and down inside the liquid separator 3. The square nut 32 drives the first lifting rod 33 to move horizontally up and down synchronously. The first lifting rod 33 drives the lifting ring 210 to move horizontally up and down on the scraper rod 22 via the rotating ring 39. 10. During the lifting and lowering process, the angle of the adjusting rod 23 on the side of the connecting rod 24 is changed. At this time, the position of the connecting rod 24 changes, while the position of the scraper body 27 on the side wall of the evaporation cylinder 1 is relatively fixed. This allows adjustment of the preload of the first spring 28 between it and the scraper bracket 26, thereby adjusting the squeezing pressure of the scraper body 27 on the inner wall of the evaporation cylinder 1. By simultaneously adjusting the squeezing pressure of multiple sets of scraper bodies 27 on the inner wall of the evaporation cylinder 1, excessive or insufficient pressure on the inner wall of the evaporation cylinder 1 by the scraper body 27 is avoided. This ensures the efficiency of recycling, avoids severe wear, and extends the service life of the equipment.

[0047] The output shaft of the third motor 45 drives the first rotating shaft 46 to rotate, which in turn drives the support rod 47 and the bottom rod 56 to rotate. During the rotation, the support rod 47 changes its position at the bottom of the linkage plate 44. Since the linkage plate 44 is arc-shaped with a high center and low sides, when the worm gear 37 is located on both sides of the linkage plate 44, the support height of the worm gear 37 on the limiting baffle 43 through the linkage plate 44 decreases, thereby reducing the gap between the liquid separator 3 and the limiting baffle 43. At this time, the gap between the liquid separator 3 and the limiting baffle 43 increases, increasing the liquid inlet. Conversely, it can also reduce the gap between the liquid separator 3 and the limiting baffle 43. The feed inlet 12 will pour the waste liquid into the space between the liquid separator 3 and the limiting baffle 43, thereby controlling the waste liquid feeding speed. At the same time, the bottom rod... During the rotation of 56, the linkage column 57 rotates, which in turn drives the crossbar 55 to rotate on the surface of the drive shaft 21. The crossbar 55 drives the rotating end of each linkage bearing 54 to rotate, and the rotating end of the linkage bearing 54 drives the second shaft 5 to rotate via the fine-tuning rod 53. The second shaft 5 drives the scraper body 27 to rotate synchronously on the scraper support 26, thereby changing the angle of multiple sets of scraper bodies 27. At the same time, it coordinates the control of the feeding speed and the tilt angle of the scraper body 27 inside the evaporation cylinder 1. It can be flexibly adjusted according to the specific properties of the waste liquid. For high-viscosity waste liquid, the feeding speed can be reduced and the angle of the scraper body 27 can be adjusted to adapt to its flowability. For low-viscosity waste liquid, the feeding speed can be appropriately increased and the angle of the scraper body 27 can be adjusted to improve the treatment efficiency.

[0048] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A high-efficiency distillation and purification device for NMP recovery waste liquid, characterized in that: The device includes an evaporator cylinder (1), on which a heating device (11) is provided. A feed inlet (12) is fixedly connected to the top of the evaporator cylinder (1), and a discharge outlet (13) is fixedly connected to the bottom of the evaporator cylinder (1). A scraper mechanism is provided on the surface of the evaporator cylinder (1), which includes a first motor (2). The first motor (2) is fixedly connected to the surface of the evaporator cylinder (1). A drive shaft (21) is fixedly connected to the output shaft of the first motor (2). A scraper rod (22) is fixedly connected to the bottom of the drive shaft (21). A lifting ring (210) is slidably connected to the surface of the scraper rod (22), and an adjustment mechanism is rotatably connected to the surface of the lifting ring (210). The adjusting rod (23) is rotatably connected to a connecting rod (24) at one end away from the lifting ring (210). A guide rod (25) is slidably connected to the surface of the connecting rod (24). A scraper bracket (26) is fixedly connected to the surface of the guide rod (25). A scraper body (27) is rotatably disposed on the surface of the scraper bracket (26). A first spring (28) is fixedly connected between the connecting rod (24) and the scraper bracket (26). A pressure sensor (29) is fixedly connected to the surface of the connecting rod (24). The output end of the pressure sensor (29) is fixedly connected to the surface of the scraper bracket (26). A liquid separator (3) is fixedly connected inside the evaporation cylinder (1). The internal sliding baffle (43) of the liquid separator (3) is provided with a pressure adjustment mechanism, an angle adjustment mechanism, and a gap adjustment mechanism. The pressure adjustment mechanism includes a bidirectional screw (31), which is rotatably connected to the surface of the liquid separator (3). A square nut (32) is threaded onto the surface of the liquid separator (3). A first lifting rod (33) is fixedly connected to the bottom of the square nut (32). A second motor (34) is fixedly connected inside the liquid separator (3). A worm gear (35) is fixedly connected to the output shaft of the second motor (34). The bottom of the bidirectional screw (31) is... A first gear (36) is fixedly connected to the part, a second gear (38) is rotatably connected to the surface of the liquid separator (3), a worm gear (37) is fixedly connected to the top of the second gear (38), a rotating ring (39) is fixedly connected to the bottom of the first lifting rod (33), the rotating ring (39) is rotatably connected to the surface of the lifting ring (210), the angle adjustment mechanism includes a second rotating shaft (5), the second rotating shaft (5) is rotatably connected to the surface of the scraper bracket (26), the scraper body (27) is fixedly connected to the surface of the second rotating shaft (5), a torsion spring (51) is fixedly connected between the second rotating shaft (5) and the scraper body (27), and a fine adjustment rod (53) is fixedly connected to the top of the second rotating shaft (5).A linkage bearing (54) is fixedly connected to the surface of the drive shaft (21). A crossbar (55) is fixedly connected to the rotating end of the linkage bearing (54). A bottom rod (56) is fixedly connected to the bottom of the first shaft (46). A linkage column (57) is fixedly connected to the bottom of the bottom rod (56). The linkage column (57) is inserted into one end of the crossbar (55). The rotating end of the linkage bearing (54) is rotatably mounted on the end of the limiting baffle (43) away from the second shaft (5).

2. The high-efficiency distillation and purification device for NMP waste liquid according to claim 1, characterized in that: The gap adjustment mechanism includes a guide cylinder (4), a second spring (41) is fixedly connected to the surface of the guide cylinder (4), a second lifting rod (42) is fixedly connected to the surface of the second spring (41), the bottom of the second lifting rod (42) is fixedly connected to the top of the limiting baffle (43), the second lifting rod (42) is slidably connected to the surface of the guide cylinder (4), a linkage plate (44) is fixedly connected to the bottom of the limiting baffle (43), a third motor (45) is fixedly connected to the surface of the liquid separator (3), a first rotating shaft (46) is fixedly connected to the output shaft of the third motor (45), and a support rod (47) is fixedly connected to the surface of the first rotating shaft (46).

3. The high-efficiency distillation and purification device for NMP waste liquid according to claim 1, characterized in that: The first motor (2) drives the drive shaft (21) to rotate through the output shaft. The drive shaft (21) drives the scraper rod (22) to rotate synchronously. The scraper rod (22) drives the scraper body (27) to rotate on the inner wall of the evaporation cylinder (1) through the lifting ring (210). The scraper rod (22) is provided with protrusions on its surface, and the lifting ring (210) is provided with grooves that fit the protrusions. There are two sets of adjusting rods (23), and the two sets of adjusting rods (23) support the scraper bracket (26) and the scraper body (27) on the lifting ring (210) through the connecting rod (24). The elastic force of the first spring (28) acts on the scraper bracket (26) and the connecting rod (24). The scraper bracket (26) presses the scraper body (27) against the inner wall of the evaporation cylinder (1).

4. The high-efficiency distillation and purification device for NMP waste liquid according to claim 1, characterized in that: The worm (35) and worm wheel (37) mesh with each other, the first gear (36) and the second gear (38) mesh with each other, the second motor (34) drives the worm (35) to rotate through the output shaft, the worm (35) drives the second gear (38) to rotate through the worm wheel (37), and the second gear (38) drives the bidirectional screw (31) to rotate through the first gear (36).

5. The high-efficiency distillation and purification device for NMP waste liquid according to claim 1, characterized in that: The bidirectional screw (31) drives the square nut (32) to move horizontally up and down inside the liquid separator (3) by rotation. The square nut (32) drives the first lifting rod (33) to move horizontally up and down synchronously. The first lifting rod (33) drives the lifting ring (210) to move horizontally up and down on the scraper rod (22) through the rotating ring (39). During the lifting process, the lifting ring (210) changes the angle of the adjusting rod (23) on the side of the connecting rod (24).

6. The high-efficiency distillation and purification device for NMP waste liquid according to claim 2, characterized in that: The limiting baffle (43) slides and rises inside the evaporation cylinder (1) via the guide cylinder (4) and the second spring (41). The elastic force of the second spring (41) acts on the limiting baffle (43) through the second lifting rod (42). The limiting baffle (43) is generally horn-shaped. The linkage plate (44) is generally arc-shaped, with a high center and low sides. The third motor (45) drives the first rotating shaft (46) to rotate through the output shaft. The first rotating shaft (46) drives the support rod (47) to rotate synchronously. The support rod (47) is in contact with the surface of the linkage plate (44).

7. The high-efficiency distillation and purification device for NMP waste liquid according to claim 1, characterized in that: The scraper body (27) rotates on the surface of the scraper bracket (26) via the second rotating shaft (5). The elastic force of the torsion spring (51) acts on the scraper body (27). The crossbar (55) rotates on the drive shaft (21) via the rotating end of the linkage bearing (54). A circular hole is provided on the surface of the crossbar (55). The bottom rod (56) is inserted into the circular hole of the crossbar (55). The bottom rod (56) rotates synchronously via the first rotating shaft (46).

8. The high-efficiency distillation and purification device for NMP waste liquid according to claim 1, characterized in that: During the rotation of the bottom rod (56), the linkage column (57) is driven to rotate. The linkage column (57) drives the crossbar (55) to rotate on the surface of the drive shaft (21). The crossbar (55) drives the rotating end of the linkage bearing (54) to rotate. The rotating end of the linkage bearing (54) drives the second shaft (5) to rotate through the fine adjustment rod (53). The second shaft (5) drives the scraper body (27) to rotate synchronously on the scraper bracket (26).

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