Rake dryer for producing ethylenediamine

Abstract

The invention belongs to the technical field of chemical engineering, and discloses a rake dryer for producing ethylenediamine, which comprises a support frame, a barrel, a stirring shaft and a plurality of rake teeth arranged on the stirring shaft, one end of each rake tooth far away from the stirring shaft is provided with an insertion hole, a scraper is inserted in the insertion hole, a connecting frame is fixed on the scraper, an adjusting channel is formed in the stirring shaft, and the adjusting channel is communicated with the barrel. The adjusting channel is arranged in the axial direction of the stirring shaft, and an adjusting rod is arranged in the adjusting channel. Compared with the prior art, the device has the following advantages and effects that the position of the adjusting rod is adjusted through the adjusting mechanism, then the effect of adjusting the positions of the adjusting frame and the scrapers is achieved, the scraping area of the scrapers to the inner wall of the barrel is increased, the distance between every two adjacent scrapers is equal to or smaller than the moving distance of the scrapers, and the scraping efficiency is improved. The scraping area of the scraping plate on the inner wall of the barrel can cover the inner wall of the barrel, and scraping dead angles are reduced. When the inner jacket of the barrel is used for heating the materials in the barrel, the materials are uniformly heated, and the materials can be accurately controlled.

Description

Technical Field

[0001] The present invention relates to the technical field of chemical industry, in particular to a rake dryer for producing ethylenediamine. Background Art

[0002] Ethylenediamine, abbreviated as EDA, has a chemical formula of C2H8N2 and is a typical aliphatic diamine. It occurs as a colorless or slightly yellow oily or watery, transparent liquid. Ethylenediamine can be used in the manufacture of fuels, rubber vulcanization accelerators, and pharmaceuticals. There are various synthesis and isolation processes for ethylenediamine. One synthesis route involves reacting ethylenediamine hydrochloride with sodium hydroxide to produce ethylenediamine, sodium chloride, and water. Post-processing in the synthesis process requires the use of a rake dryer, which heats the reaction product to between 115-125°C using indirect steam heating. During this heating process, a colorless liquid is gradually obtained: a mixture of ethylenediamine, water, and sodium chloride. Under vacuum, the liquid ethylenediamine and water mixture in the reaction mixture evaporates through the vapor outlet into a cooler. After a first stage of ambient temperature condensation followed by a second stage of indirect condensation using chilled water, it is stored in a receiving tank. The solids in the reaction mixture are dried in the rake dryer and discharged through the discharge port for bagging.

[0003] A rake dryer, also known as a rake dryer or rake vacuum dryer, primarily consists of a cylinder, agitator shaft, power unit, transmission, and sealing mechanism. The agitator shaft is equipped with flat or slurry-shaped rake teeth, which are typically hollow. These teeth are used to pass a heating medium through the cylinder to heat the material within. The cylinder primarily consists of an inner liner, a jacket, and an outer insulation layer. For example, Chinese invention patent CN117091373A discloses a highly efficient and multifunctional vacuum rake dryer. During operation, material may adhere to the inner wall of the cylinder. If this adhered material is not promptly removed, it can affect the uniformity of heating within the cylinder by the jacket. Prior art methods typically employ scrapers mounted on the agitator shaft's rake teeth, placed close to the inner wall, to remove adhered material. However, this arrangement results in a small scraping area on the inner wall, preventing material adhered to the area between the rake teeth from being removed. For example, if the scraper length is directly extended to the axial length of the inner wall of the cylinder or the number of rake teeth along the axial direction of the cylinder is increased to reduce the interval between the scrapers, although all the materials on the inner wall of the cylinder can be scraped off, it will cause excessive resistance during the rotation of the stirring shaft, significantly increasing the energy consumption of the power unit, and the overly long scraper will be subjected to a large load during the rotation with the stirring shaft, and it is easy to bend and deform. In the document "Design of the Rake Shaft of a Vacuum Rake Dryer Based on Failure Mechanism" published by Fan Haijun et al. in "Packaging and Food Machinery" Vol. 40, No. 1, February 2022, it is mentioned that some chains with inertial properties are added between two adjacent rake teeth. During rotation, the chains rub against the inner wall of the container, thereby reducing scaling. Although the addition of chains can reduce the material attached to the inside of the container through friction, its scraping effect is limited. Summary of the Invention

[0004] The object of the present invention is to provide a rake dryer for producing ethylenediamine, which has the effect of being able to adjust the position of a scraper and increase the area of the scraper scraping the inner wall of the cylinder.

[0005] The above technical objectives of the present invention are achieved through the following technical solutions: A rake dryer for producing ethylenediamine, comprising a supporting frame, a cylinder, a stirring shaft, and a plurality of rake teeth arranged on the stirring shaft, wherein the rake teeth are provided with a socket at one end away from the stirring shaft, a scraper is inserted into the socket, a connecting frame is fixed to the scraper, an adjustment channel is formed inside the stirring shaft, the adjustment channel is arranged along the axial direction of the stirring shaft, an adjustment rod is provided in the adjustment channel, a plurality of connecting ports are provided on the side wall of the adjustment channel, the connecting frame is fixed to the adjustment rod after passing through the connecting port, and the stirring shaft is provided with an adjustment mechanism for adjusting the adjustment rod to move axially along the stirring shaft.

[0006] By adopting this technical solution, the rake teeth move with the agitator shaft as it rotates, stirring the material inside the cylinder. After the agitator shaft has rotated at least one revolution, the adjustment mechanism adjusts the position of the connecting frame by adjusting the position of the adjustment lever, thereby adjusting the position of the scraper, thereby increasing the scraping area on the inner wall of the cylinder.

[0007] The present invention is further configured as follows: the connecting frame is covered with a protective soft cover, one end of the protective soft cover is fixed to the connecting frame, and the other end of the protective soft cover is fixed to the outer edge of a circle of the connecting port.

[0008] By adopting the above technical solution, since the connecting frame needs to pass through the connecting port and be connected to the adjustment rod, if the connecting port is not processed, the material in the cylinder will enter the adjustment channel from the connecting port. Therefore, the present invention provides a protective soft cover, which is put on the connecting frame, and one end is fixed to the connecting frame, and the connection is sealed by fixing. The other end covers the connecting port and is fixed on the outer edge of the connecting port, and the sealing is achieved by fixing. In this way, it can prevent the material in the cylinder from entering the adjustment channel from the connecting port without affecting the movement of the connecting frame. The material of the protective soft cover is selected from a high temperature and corrosion resistant material, such as fluororubber.

[0009] The present invention is further configured as follows: the connecting frame includes a connecting arm and two connecting plates fixed to the connecting arm, the two connecting plates are respectively fixed to both ends of the scraper, the side wall of the rake teeth is formed with a plane, and the connecting arm is attached to the plane.

[0010] By adopting the above technical solution, during the rotation of the stirring shaft, the side of the scraper is tightly attached to the inner wall of the socket after being subjected to the force of the material in the cylinder. At the same time, the connecting frame is also tightly attached to the plane due to the force of the material in the cylinder and the force transmitted by the scraper. When the adjustment mechanism does not operate, the scraper and the connecting frame will not move relative to the stirring shaft and the rake teeth.

[0011] The present invention is further configured as follows: the stirring shaft includes a central shaft and an end shaft fixed at one end of the central shaft; a sealing device is installed between the central shaft and the cylinder; the diameter of the central shaft is larger than the diameter of the end shaft; one end opening of the adjustment channel is located on the end face of the central shaft; and the number of the adjustment channels and the adjustment rods are both multiple.

[0012] By adopting the above technical solution and setting it up in this way, the original sealing device structure of the rake dryer does not need to be changed after the adjustment rod is added, which facilitates the production and manufacturing of the actual product of the present invention.

[0013] The present invention is further configured as follows: the adjustment mechanism includes a reciprocating screw fixed on the end shaft, a nut assembly installed on the reciprocating screw, an adjustment frame fixed on the nut assembly, a first adjustment part and a second adjustment part fixed on the adjustment frame, a mounting ring body, an angular contact ball bearing installed on the mounting ring body, and an adjustment ring fixed to the outer ring of the angular contact ball bearing. The end of the adjustment rod located outside the adjustment channel is fixed on the mounting ring body, the inner ring of the angular contact ball bearing is fixed to the outer wall of the mounting ring body, the first adjustment part and the second adjustment part are distributed on both sides of the adjustment ring, the support frame is fixed with a plurality of guide rods, the adjustment frame is provided with a plurality of guide holes, and the guide rods are inserted into the guide holes.

[0014] By adopting the above technical solution, the stirring shaft drives the reciprocating screw to rotate, which in turn drives the nut assembly to move in one direction. After the nut assembly drives the adjustment frame to move a certain distance, the first adjustment portion on the adjustment frame contacts the adjustment ring. During the process of the nut assembly driving the adjustment frame to move to one end of the motion stroke, the first adjustment portion pushes the adjustment ring to move the angular contact ball bearing, the mounting ring, and the adjustment rod. The reciprocating screw then drives the nut assembly to move in the opposite direction. After the nut assembly drives the adjustment frame to move in the opposite direction for a certain distance, the second adjustment portion on the adjustment frame contacts the adjustment ring. During the process of the nut assembly driving the adjustment frame to move in the opposite direction to the other end of the motion stroke, the first adjustment portion pushes the adjustment ring to move the angular contact ball bearing, the mounting ring, and the adjustment rod.

[0015] The adjustment mechanism of the present invention is configured in this way, which has at least the following two advantages. First, the reciprocating screw is driven to rotate by the power of the rotating stirring shaft itself, thereby driving the adjustment of the adjustment rod. The structural design is sophisticated and does not require an additional power device. Second, during the rotation of the stirring shaft of the present invention, a scraper is required to scrape off the material attached to the inner wall of the cylinder. Taking the two end positions of the scraper's movement stroke as an example, the scraper is required to maintain each end position for a period of time so that the stirring shaft can rotate at least one circle. Therefore, the present invention sets up a structure of an adjustment frame, a first adjustment part, a second adjustment part, and an adjustment ring. In the process of automatically adjusting the position of the adjustment rod, there will be a time interval between two adjacent adjustment actions to meet the requirement that the scraper maintains the end position for a period of time.

[0016] The present invention is further configured such that: a distance between the first adjustment portion and the second adjustment portion is greater than a width of the adjustment ring.

[0017] The present invention is further configured such that the cross-sections of the adjusting rod and the adjusting channel are both rectangular.

[0018] By adopting the above technical solution, the rotation of the adjustment rod in the adjustment channel is restricted.

[0019] The present invention is further configured as follows: a plurality of air flow channels are provided at the end of the central axis, and the plurality of air flow channels correspond one-to-one to the plurality of adjustment channels respectively; an air pipe joint is provided at one end of the air flow channel located at the end of the central axis, and the other end of the air flow channel is connected to the corresponding adjustment channel; a sealing frame is provided at the end of the central axis, and the sealing frame is provided with at least three through-holes; an adjusting bolt is provided at the through-hole and is threadedly connected to the end of the central axis after passing through the through-hole; a U-shaped pad is provided on the adjusting bolt; the U-shaped pad is located between the sealing frame and the end of the central axis; the sealing frame is provided with a plurality of sealing rings, and the plurality of sealing rings correspond one-to-one to the plurality of adjustment channels; the sealing ring is used to seal the gap between the outer wall of the adjusting rod and the inner wall of the adjusting channel; and the cylinder is provided with a transparent observation window.

[0020] While the protective sleeve can be made of high-temperature and corrosion-resistant materials using the above technical solution, it will inevitably deteriorate during use. While the protective sleeve can be regularly replaced during regular maintenance of the rake dryer, the presence of the agitator shaft and multiple rake teeth inside the dryer makes it difficult for personnel to access and inspect the sleeve during daily use.

[0021] Based on this, the present invention incorporates a function to detect whether the protective sleeve is cracked. After the rake dryer has finished operating, the agitator shaft is stopped and water is introduced into the dryer until the water level is above the protective sleeve. The bolts are loosened, the U-shaped spacers are removed, and the bolts are tightened again. The sealing frame is pressed against the end of the central shaft. The sealing ring on the sealing frame seals the gap between the outer wall of the adjustment rod and the inner wall of the adjustment channel, achieving a seal. Multiple air pipes are then connected to the air pipe connector at the end of the central shaft. These pipes are connected to a compressed air source, which feeds compressed air into the air flow channel and the adjustment channel through the air pipes, maintaining a high air pressure. A worker observes the water level inside the cylinder through an observation window. If bubbles continuously appear in the water, it indicates that the protective sleeve below the bubbles is cracked or damaged. The water is then drained and the damaged protective sleeve is replaced. If no bubbles appear in the water, the protective sleeve is not cracked or damaged and does not need to be replaced at this time. The rake dryer then enters the cleaning process, using the water inside the cylinder to clean the inner wall.

[0022] After the inspection is completed, loosen the bolts, pull the sealing frame to move the sealing ring away from the end face of the central shaft, and then put the U-shaped pad on the screw of the bolt so that the U-shaped pad is located between the end face of the central shaft and the sealing frame. At this time, tighten the bolts again to fix the position of the sealing frame and prevent the sealing ring from being squeezed and interfering with the movement of the adjusting rod.

[0023] The present invention is further configured such that: along the axial direction of the cylinder, the distance between two adjacent scrapers is equal to or less than the moving distance of the scrapers.

[0024] By adopting the above technical solution, the scraping area of the scraper on the inner wall of the cylinder can cover all areas of the inner wall of the cylinder.

[0025] The beneficial effects of the present invention are:

[0026] 1. The present invention adjusts the position of the adjustment rod through an adjustment mechanism, thereby adjusting the position of the adjustment frame and scraper. This increases the scraping area of the inner wall of the barrel. The distance between two adjacent scrapers is equal to or less than the scraper's travel distance, so that the scraping area of the inner wall of the barrel can cover the inner wall of the barrel, reducing the scraping dead angle. When the jacket inside the barrel heats the material inside the barrel, the material is heated evenly, and the material can be precisely controlled.

[0027] 2. The present invention's sophisticated adjustment mechanism utilizes the agitator shaft's own rotational power to adjust the adjustment lever position, eliminating the need for additional energy. Furthermore, the adjustment mechanism allows the scraper to maintain its position for a period of time after reaching the end of its travel, allowing it to scrape at least one full circle around the inner wall of the cylinder, depending on the actual operating conditions.

[0028] 3. The present invention can detect the protective soft cover, find out the broken or damaged protective soft cover, and replace it in time. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of the present invention.

[0030] Figure 2 It is a schematic diagram of the positional relationship among the support frame, stirring shaft and rake teeth of the present invention.

[0031] Figure 3 It is a schematic diagram of the connection relationship between the rake teeth and the connecting frame of the present invention.

[0032] Figure 4 It is a schematic diagram of the positional relationship between the protective soft cover and the connecting frame of the present invention.

[0033] Figure 5 This is a schematic diagram of the positional relationship between the middle shaft, end shaft, and adjustment mechanism of the present invention. Figure 1 .

[0034] Figure 6 This is a schematic diagram of the positional relationship between the middle shaft, end shaft, and adjustment mechanism of the present invention. Figure 2 .

[0035] Figure 7It is a schematic diagram of the positional relationship among the adjustment frame, reciprocating screw, nut assembly and adjustment ring of the present invention.

[0036] Figure 8 It is a schematic diagram of the positional relationship among the middle shaft, end shafts, sealing frame and adjusting rod of the present invention.

[0037] Figure 9 It is a schematic diagram of the separation state of the stirring shaft, the sealing frame and the regulating rod of the present invention.

[0038] Figure 10 It is a schematic diagram of the cross-sectional structure between the middle shaft and the end shaft of the present invention.

[0039] In the figure, 1. support frame; 11. guide rod; 12. reduction motor; 2. cylinder; 21. observation window; 3. stirring shaft; 31. middle shaft; 32. end shaft; 33. adjustment channel; 331. connection port; 34. air flow channel; 341. air pipe joint; 4. rake teeth; 41. socket; 42. scraper; 5. connecting frame; 51. connecting arm; 52. connecting plate; 53. protective soft cover; 6. adjustment rod; 7. adjustment mechanism; 71. reciprocating screw; 72. nut assembly; 73. adjustment frame; 731. first adjustment part; 732. second adjustment part; 733. guide hole; 74. mounting ring; 75. angular contact ball bearing; 76. adjustment ring; 8. sealing frame; 81. adjustment bolt; 82. U-shaped pad; 83. sealing ring. DETAILED DESCRIPTION

[0040] A rake dryer for producing ethylenediamine, such as Figures 1 to 4 As shown, it includes a support frame 1, a cylinder 2, a stirring shaft 3, and a plurality of rake teeth 4 installed on the stirring shaft 3. The cylinder 2 includes an inner shell, a jacket and an outer insulation layer. A motor is installed on the support frame 1, and the motor is used to drive the stirring shaft 3 to rotate. Each rake tooth 4 is provided with a socket 41 at the end away from the stirring shaft 3, and a scraper 42 is inserted into the socket 41. The scraper 42 is fixed with a connecting frame 5, and an adjustment channel 33 is formed inside the stirring shaft 3. The adjustment channel 33 is arranged axially along the stirring shaft 3. An adjustment rod 6 is provided in the adjustment channel 33, and the cross-sections of the adjustment rod 6 and the adjustment channel 33 are both rectangular. The side wall of the adjustment channel 33 is provided with a plurality of connecting ports 331, and the plurality of connecting holes correspond one-to-one to the plurality of connecting frames 5. The connecting frame 5 is fixed to the adjustment rod 6 after passing through the corresponding connecting port 331. The stirring shaft 3 is provided with an adjustment mechanism 7 for adjusting the adjustment rod 6 to move axially along the stirring shaft 3. Along the axial direction of the cylinder 2 , the distance between two adjacent scrapers 42 is equal to or less than the moving distance of the scraper 42 , so that the sum of the scraping areas inside the cylinder 2 by the multiple scrapers 42 can cover the inner wall of the cylinder 2 .

[0041] The connecting frame 5 includes a connecting arm 51 and two connecting plates 52 fixed to the connecting arm 51 . The two connecting plates 52 are respectively fixed to two ends of the scraper 42 .

[0042] like Figures 5 and 6 、 Figures 8 and 9 As shown, there are multiple adjustment channels 33 and adjustment rods 6. The stirring shaft 3 includes a central shaft 31 and an end shaft 32 fixed to one end of the central shaft 31. A sealing device is installed between the central shaft 31 and the cylinder 2. The diameter of the central shaft 31 is larger than the diameter of the end shaft 32. One end of the adjustment channel 33 is open on the end face of the central shaft 31, and the other end of the adjustment channel 33 is a closed structure, which is located inside the stirring shaft 3. One end of the adjustment rod 6 passes through the end face of the central shaft 31 and is located outside the adjustment channel 33. The support frame 1 is equipped with a reduction motor 12. The power output shaft of the reduction motor 12 is connected to the end of the central shaft 31 away from the end shaft 32, which is used to drive the central shaft 31 to rotate.

[0043] like Figures 5 to 7 As shown, the adjustment mechanism 7 includes a reciprocating screw 71 fixed to the end shaft 32, a nut assembly 72 mounted on the reciprocating screw 71, an adjustment frame 73 fixed to the nut assembly 72, a first adjustment portion 731 and a second adjustment portion 732 fixed to the adjustment frame 73, a mounting ring 74, an angular contact ball bearing 75 mounted on the mounting ring 74, and an adjustment ring 76 fixed to the outer ring of the angular contact ball bearing 75. The end of the adjustment rod 6 located outside the adjustment channel 33 is fixed to the mounting ring 74. The inner ring of the angular contact ball bearing 75 is fixed to the outer wall of the mounting ring 74. The first adjustment portion 731 and the second adjustment portion 732 are distributed on both sides of the adjustment ring 76. The support frame 1 is fixed with a plurality of guide rods 11. The adjustment frame 73 defines a plurality of guide holes 733, into which the guide rods 11 are inserted. The distance between the first adjustment portion 731 and the second adjustment portion 732 is greater than the width of the adjustment ring 76.

[0044] The working principle of the adjustment mechanism 7 is as follows: the agitator shaft 3 rotates the reciprocating screw 71, which in turn drives the nut assembly 72 in one direction. After the nut assembly 72 drives the adjustment frame 73 to move a certain distance, the first adjustment portion 731 on the adjustment frame 73 contacts the adjustment ring 76. As the nut assembly 72 drives the adjustment frame 73 to one end of its travel, the first adjustment portion 731 pushes the adjustment ring 76, which in turn moves the angular contact ball bearing 75, the mounting ring 74, and the adjustment rod 6. The reciprocating screw 71 then drives the nut assembly 72 in the opposite direction. After the nut assembly 72 drives the adjustment frame 73 in the opposite direction for a certain distance, the second adjustment portion 732 on the adjustment frame 73 contacts the adjustment ring 76. As the nut assembly 72 drives the adjustment frame 73 in the opposite direction to the other end of its travel, the first adjustment portion 731 pushes the adjustment ring 76, which in turn moves the angular contact ball bearing 75, the mounting ring 74, and the adjustment rod 6.

[0045] like Figures 2 to 4 As shown, each connecting frame 5 is covered with a protective soft cover 53. One end of the protective soft cover 53 is fixed to the connecting frame 5, and the other end is fixed to the outer edge of the connection port 331. Since the connecting frame 5 needs to pass through the connection port 331 to connect to the adjustment rod 6, if the connection port 331 is not treated, the material in the cylinder 2 will enter the adjustment channel 33 through the connection port 331. Therefore, the present invention provides a protective soft cover 53. The protective soft cover 53 is sleeved on the connecting frame 5, with one end fixed to the connecting frame 5, and the connection is sealed by fixing. The other end covers the connection port 331 and is fixed to the outer edge of the connection port 331. The fixing is sealed. In this way, the material in the cylinder 2 is prevented from entering the adjustment channel 33 through the connection port 331 without affecting the movement of the connecting frame 5. The material of the protective soft cover 53 is selected from a high-temperature and corrosion-resistant material, such as fluororubber.

[0046] like Figures 8 to 10 As shown, a plurality of air flow channels 34 are provided at the end of the central axis 31, and the plurality of air flow channels 34 correspond one-to-one to the plurality of adjustment channels 33 respectively. An end of the air flow channel 34 located at the end of the central axis 31 is provided with an air pipe joint 341, and the other end of the air flow channel 34 is connected to the corresponding adjustment channel 33. A sealing frame 8 is provided at the end of the central axis 31, and the sealing frame 8 is provided with at least three through-holes. An adjusting bolt 81 is provided at the through-hole and is threadedly connected to the end of the central axis 31 after passing through the through-holes. A U-shaped pad 82U is provided on the adjusting bolt 81, and the U-shaped pad 82U is located between the sealing frame 8 and the end of the central axis 31. The sealing frame 8 is provided with a plurality of sealing rings 83, and the plurality of sealing rings 83 correspond one-to-one to the plurality of adjustment channels 33. The sealing ring 83 is used to seal the gap between the outer wall of the adjustment rod 6 and the inner wall of the adjustment channel 33. The cylinder 2 is provided with a transparent observation window 21.

[0047] The working principle of the protective sleeve 53 rupture detection system is as follows: After the rake dryer has finished operating, the rotation of the agitator shaft 3 is stopped, and water is introduced into the dryer until the water level is above the protective sleeve 53. The bolts are loosened, the U-shaped spacer 82U is removed, and the bolts are tightened again. The sealing frame 8 is pressed against the end of the central shaft 31. The sealing ring 83 on the sealing frame 8 seals the gap between the outer wall of the adjustment rod 6 and the inner wall of the adjustment channel 33, achieving a seal. Multiple air pipes are then connected to the air pipe connector 341 at the end of the central shaft 31. The air pipes are connected to a compressed air source, which introduces compressed air into the air flow channel 34 and the adjustment channel 33 through the air pipes, maintaining a high air pressure. The operator observes the water level inside the cylinder 2 through the observation window 21. If bubbles continuously appear in the water, it indicates that the protective sleeve 53 below the bubbles is ruptured or damaged. The water is then drained and the damaged protective sleeve 53 is replaced. As no bubble emerges in the water, it is illustrated that there is no rupture damage in the protective soft cover 53, and it is temporarily not necessary to replace. Now, the rake dryer enters the cleaning operation, and utilizes the water inside the cylindrical shell 2 to carry out the cleaning operation on the cylindrical shell 2 inwalls.

Claims

1. A rake dryer for producing ethylenediamine, comprising a support frame (1), a cylinder (2), a stirring shaft (3), and a plurality of rake teeth (4) provided on the stirring shaft (3), characterized in that: The rake teeth (4) are provided with a socket (41) at one end away from the stirring shaft (3), a scraper (42) is inserted into the socket (41), a connecting frame (5) is fixed to the scraper (42), an adjusting channel (33) is formed inside the stirring shaft (3), the adjusting channel (33) is arranged along the axial direction of the stirring shaft (3), an adjusting rod (6) is provided in the adjusting channel (33), a plurality of connecting ports (331) are provided on the side wall of the adjusting channel (33), the connecting frame (5) is fixed to the adjusting rod (6) after passing through the connecting port (331), and the stirring shaft (3) is provided with an adjusting mechanism (7) for adjusting the adjusting rod (6) to move axially along the stirring shaft (3).

2. A rake dryer for producing ethylenediamine according to claim 1, characterized in that: The connecting frame (5) is covered with a protective soft cover (53), one end of the protective soft cover (53) is fixed to the connecting frame (5), and the other end of the protective soft cover (53) is fixed to the outer edge of a circle of the connecting port (331).

3. A rake dryer for producing ethylenediamine according to claim 1 or 2, characterized in that: The connecting frame (5) includes a connecting arm (51) and two connecting plates (52) fixed to the connecting arm (51). The two connecting plates (52) are respectively fixed to the two ends of the scraper (42). The side wall of the rake tooth (4) is formed with a plane, and the connecting arm (51) is attached to the plane.

4. A rake dryer for producing ethylenediamine according to claim 1, characterized in that: The stirring shaft (3) comprises a central shaft (31) and an end shaft (32) fixed to one end of the central shaft (31); a sealing device is installed between the central shaft (31) and the cylinder (2); the diameter of the central shaft (31) is larger than the diameter of the end shaft (32); one end opening of the regulating channel (33) is located on the end face of the central shaft (31); and the number of the regulating channels (33) and the regulating rods (6) are both plural.

5. A rake dryer for producing ethylenediamine according to claim 4, characterized in that: The adjusting mechanism (7) comprises a reciprocating screw (71) fixed to the end shaft (32), a nut assembly (72) mounted on the reciprocating screw (71), an adjusting frame (73) fixed to the nut assembly (72), a first adjusting portion (731) and a second adjusting portion (732) fixed to the adjusting frame (73), a mounting ring (74), an angular contact ball bearing (75) mounted on the mounting ring (74), an adjusting ring (76) fixed to the outer ring of the angular contact ball bearing (75), and the adjusting rod ( 6) One end located outside the adjustment channel (33) is fixed to the mounting ring body (74), the inner ring of the angular contact ball bearing (75) is fixed to the outer wall of the mounting ring body (74), the first adjustment portion (731) and the second adjustment portion (732) are distributed on both sides of the adjustment ring (76), the support frame (1) is fixed with a plurality of guide rods (11), the adjustment frame (73) is provided with a plurality of guide holes (733), and the guide rods (11) are inserted into the guide holes (733).

6. A rake dryer for producing ethylenediamine according to claim 5, characterized in that: The distance between the first adjustment portion (731) and the second adjustment portion (732) is greater than the width of the adjustment ring (76).

7. A rake dryer for producing ethylenediamine according to claim 1, characterized in that: The cross-sections of the regulating rod (6) and the regulating channel (33) are both rectangular.

8. A rake dryer for producing ethylenediamine according to claim 4, characterized in that: The end of the central axis (31) is provided with a plurality of air flow channels (34), and the plurality of air flow channels (34) correspond to the plurality of regulating channels (33) one by one. One end of the air flow channel (34) located at the end of the central axis (31) is provided with an air pipe joint (341), and the other end of the air flow channel (34) is connected to the corresponding regulating channel (33). The end of the central axis (31) is provided with a sealing frame (8), and the sealing frame (8) is provided with at least three through-holes, and the through-holes are provided with a threaded connection to the central axis after passing through the through-holes. (31) end, the adjusting bolt (81) is provided with a U-shaped pad (82U), the U-shaped pad (82U) is located between the sealing frame (8) and the end of the central axis (31), the sealing frame (8) is provided with a plurality of sealing rings (83), the plurality of sealing rings (83) correspond one to one with the plurality of adjusting channels (33), the sealing rings (83) are used to seal the gap between the outer wall of the adjusting rod (6) and the inner wall of the adjusting channel (33), and the cylinder (2) is provided with a transparent observation window (21).

9. A rake dryer for producing ethylenediamine according to claim 1, characterized in that: Along the axial direction of the cylinder (2), the distance between two adjacent scrapers (42) is equal to or less than the moving distance of the scrapers (42).

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