A purification device and purification method for 2,3-dichloropyridine

Abstract

The invention relates to the technical field of purification, in particular to a purification device and a purification method for 2,3-dichloropyridine, comprising a protection tank and a heating tank rotatably connected to the inner side of the protection tank, wherein an upper cover is installed at the upper end of the protection tank, a crushing assembly for crushing a 2,3-dichloropyridine raw material is arranged at the upper end of the upper cover, a ventilation assembly for accelerating the cooling of the surface of the heating tank is installed at the outer side of the protection tank, an inclined guard plate of the invention can facilitate the entry of wind into the inner side of the protection tank, facilitate the cooling of the heating tank, accelerate the precipitation of 2,3-dichloropyridine, and the 2,3-dichloropyridine raw material can be ground by a cutter head and a blade, so as to facilitate the dissolution of 2,3-dichloropyridine.

Description

Technical Field

[0001] The invention relates to the technical field of purification, and in particular to a purification device and a purification method for 2,3-dichloropyridine. Background Art

[0002] 2,3-Dichloropyridine is an important fine chemical intermediate and one of the most important raw materials for synthesizing the insecticide chlorfenapyr. It is widely used in chemical fields such as pesticides and medicines. After the production of 2,3-dichloropyridine, it needs to be purified. Currently, people use the different solubility of 2,3-dichloropyridine at different temperatures to purify 2,3-dichloropyridine. In order to facilitate the cooling of the 2,3-dichloropyridine solution, the existing device for purifying 2,3-dichloropyridine needs to remove the 2,3-dichloropyridine solution from the dissolution tank, which is troublesome to operate, and the removal of the high-temperature solution is easy to scald the operator. In addition, in order to facilitate the dissolution of the 2,3-dichloropyridine raw material, it needs to be ground. Therefore, we propose a purification device and a purification method for 2,3-dichloropyridine. Summary of the invention

[0003] The purpose of the present invention is to solve the shortcomings of the background technology and to propose a purification device and a purification method for 2,3-dichloropyridine.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is: a purification device for 2,3-dichloropyridine, comprising a protection tank and a heating tank rotatably connected to the inner side of the protection tank, an upper cover is installed at the upper end of the protection tank, a crushing assembly for crushing the 2,3-dichloropyridine raw material is arranged at the upper end of the upper cover, and a ventilation assembly for accelerating the cooling of the surface of the heating tank is installed on the outer side of the protection tank.

[0005] Preferably, the crushing assembly includes a crushing jar fixedly connected to the inner side of the upper cover, the lower end of the crushing jar is rotatably connected to a crushing barrel, the upper end of the crushing barrel is fixedly connected to a funnel, the funnel is located on the inner side of the crushing jar, the inner side of the funnel is fixedly connected to a baffle, the top end of the inner wall of the crushing jar is fixedly connected to a connecting column, the lower end of the connecting column is fixedly connected to a cutter head, and a blade is provided on the inner side of the crushing barrel.

[0006] Preferably, a rotating groove is opened on the inner side of the crushing tank, a rotating ring is fixedly connected to the outer side of the crushing cylinder, and the rotating ring is rotatably connected to the inner side of the rotating groove, a gear ring is fixedly connected to the outer side of the crushing cylinder, and a half-size ring is fixedly connected to the upper end of the heating tank, and the half-size ring is meshed with the gear ring.

[0007] Preferably, the inner side of the crushing cylinder is fixedly connected to a lower hopper, the lower end of the lower hopper is provided with a baffle plate, the outer side of the baffle plate is fixedly connected to a connecting shell, the inner side of the connecting shell is rotatably connected to a fixing column, the fixing column is fixedly connected to the lower hopper, the outer side of the connecting shell is fixedly connected to a toggle plate, a turning opening is provided on the outer side of the crushing cylinder, the toggle plate passes through the turning opening, a first spring sheet is provided on the inner side of the connecting shell, one end of the first spring sheet is fixedly connected to the inner wall of the connecting shell, and the other end of the first spring sheet is fixedly connected to the fixing column.

[0008] Preferably, a sealing cover is provided at the upper end of the heating tank, a feeding port is opened at the upper end of the sealing cover, a retaining ring is fixedly connected to the upper end of the sealing cover, and the retaining ring is fitted with the toggle plate.

[0009] Preferably, an air inlet is opened on the outside of the protection tank, and the ventilation assembly includes a guard plate, one end of the guard plate is fixedly connected to a sealing plate, the sealing plate fits with the air inlet, the upper and lower ends of the sealing plate are rotatably connected to a first connecting rod, the first connecting rod is slidably connected to the inner side of the air inlet, two groups of clamping rings are fixedly connected to the outside of the heating tank, one end of the first connecting rod is fixedly connected to a clamping block, the clamping block fits with the clamping ring, and a heating plate is arranged between the two groups of the clamping blocks.

[0010] Preferably, the lower end of the block is fixedly connected with a connecting plate, the inner side of the connecting plate is slidably connected with a sliding rod, the sliding rod is fixedly connected to the heating plate, the other end of the sliding rod is fixedly connected with a retaining ring, a spring is provided on the outer side of the sliding rod, and one end of the spring is fixedly connected to the retaining ring.

[0011] Preferably, a rotating shaft is fixedly connected to the inner side of the first connecting rod, hidden grooves are provided at both upper and lower ends of the sealing plate, a second spring piece is provided on the outer side of the rotating shaft, the second spring piece is located on the inner side of the hidden groove, two groups of first U-shaped plates are fixedly connected to the outer side of the guard plate, the inner side of the first U-shaped plate is rotatably connected to the second connecting rod, one end of the second connecting rod is rotatably connected to the second U-shaped plate, and the second U-shaped plate is fixedly connected to the protective tank.

[0012] A method for purifying 2,3-dichloropyridine, comprising: step 1: adding 2,3-dichloropyridine raw material to the inner side of a crushing tank and then using a motor to drive the heating tank inside the protective tank to rotate, the rotation of the heating tank will drive the sealing cover to rotate, the half-scale ring can drive the gear ring to rotate, and then drive the crushing cylinder to rotate, at this time, the rotating ring will rotate inside the rotating groove, and the cutter head and blade can be used to grind the 2,3-dichloropyridine raw material, so that the ground 2,3-dichloropyridine raw material falls into the inner side of the lower hopper. The baffle inside the funnel can stir the 2,3-dichloropyridine raw material to facilitate the falling of the 2,3-dichloropyridine raw material;

[0013] Step 2: When the baffle ring rotates to one side of the crushing tank, the baffle ring will toggle the toggle plate, so that the toggle plate drives the connecting shell to rotate on the fixed column, so that the shielding plate is moved away from the lower end of the lower hopper, so that the 2,3-dichloropyridine raw material inside the lower hopper falls into the inner side of the heating tank through the discharge port. The rotation of the heating tank can accelerate the dissolution of the 2,3-dichloropyridine raw material. When the toggle plate is separated from the baffle ring, the shielding plate can block the lower end of the lower hopper again by using the first spring sheet;

[0014] Step 3: When the sealing plate is installed to the inner side of the air inlet, the first connecting rod will push the clamping block to the clamping ring, so that the rotation of the heating tank is more stable. At the same time, the heating plate can heat the heating tank. The spring can pull the retaining ring to make the sliding rod push the heating plate and the heating tank close together;

[0015] Step 4: After the mixing is completed, the sealing plate is pulled out from the inside of the air inlet. At this time, the sealing plate will be deflected between the two sets of first connecting rods under the pull of the second connecting rod, so that the protective plate is tilted toward the side of the second connecting rod, which is convenient for the outside wind to blow into the inside of the protective tank, facilitate the cooling of the heating tank, and accelerate the precipitation of 2,3-dichloropyridine.

[0016] Compared with the prior art, the present invention provides a purification device and a purification method for 2,3-dichloropyridine, which have the following beneficial effects:

[0017] 1. A purification device and purification method for 2,3-dichloropyridine. A half-size ring can drive a gear ring to rotate, thereby driving a crushing cylinder to rotate. A rotating ring can be stuck through a rotating groove to prevent the crushing cylinder from falling. A cutter head and a blade can be used to grind a 2,3-dichloropyridine raw material. The ground 2,3-dichloropyridine raw material falls into the inner side of a lower hopper. The baffle plate on the inner side of the hopper can be used to stir the 2,3-dichloropyridine raw material to facilitate the falling of the 2,3-dichloropyridine raw material. The baffle plate can be moved through the baffle ring to move the baffle plate away from the lower end of the lower hopper, so that the 2,3-dichloropyridine raw material inside the lower hopper falls into the inner side of a heating tank through a lowering port. The baffle plate can block the lower end of the lower hopper again through a first spring sheet.

[0018] 2. A purification device and method for 2,3-dichloropyridine can block the air inlet through a sealing plate to seal the protection tank, making it convenient for the heating plate to heat the heating tank, and can clamp the clamping ring by a clamping block to ensure the stable rotation of the heating tank. The retaining ring can be pulled by a spring to make the sliding rod push the heating plate and the heating tank to be close, and the guard plate can be pulled to deflect by a second connecting rod. The inclined guard plate can facilitate wind to enter the inner side of the protection tank, facilitate cooling of the heating tank, and accelerate the precipitation of 2,3-dichloropyridine. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 It is a cross-sectional view of the present invention;

[0021] Figure 3 This is a schematic diagram of the overall structure of the crushing assembly of the present invention;

[0022] Figure 4 The crushing assembly of the present invention is cut away Figure 1 ;

[0023] Figure 5 The crushing assembly of the present invention is cut away Figure 2 ;

[0024] Figure 6 It is a partial structural schematic diagram of the crushing component of the present invention;

[0025] Figure 7 The crushing assembly of the present invention is cut away Figure 3 ;

[0026] Figure 8 For the present invention Figure 7 The enlarged structural diagram of part A in the middle;

[0027] Fig. 9 It is a schematic diagram of the structure of the ventilation assembly of the present invention;

[0028] Fig.10 A cross-sectional view of the ventilation assembly of the present invention Figure 1 ;

[0029] Fig.11 For the present invention Fig.10 The enlarged structural diagram of part B in the middle;

[0030] Fig.12 A cross-sectional view of the ventilation assembly of the present invention Figure 2 ;

[0031] Fig.13 For the present invention Fig.12 The enlarged structural diagram of the middle C part;

[0032] Fig.14 It is a partial structural schematic diagram of the ventilation component of the present invention.

[0033] In the figure: 1, protection tank; 2, heating tank; 3, upper cover; 4, crushing assembly; 41, crushing tank; 42, rotating groove; 43, rotating ring; 44, crushing cylinder; 45, gear ring; 46, connecting column; 47, blade; 48, cutter head; 49, funnel; 410, baffle; 411, lower hopper; 412, toggle plate; 413, fixed column; 414, connecting shell; 415, shielding plate; 416, first spring; 417, rotating port; 5, Ventilation assembly; 51, guard plate; 52, sealing plate; 53, first connecting rod; 54, retaining ring; 55, block; 56, heating plate; 57, connecting plate; 58, sliding rod; 59, spring; 510, retaining ring; 511, rotating shaft; 512, hidden groove; 513, second spring piece; 514, first U-shaped plate; 515, second connecting rod; 516, second U-shaped plate; 6, sealing cover; 7, half-size ring; 8, retaining ring; 9, discharge port. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0035] See also Figure 1 - Fig.14 A purification device and method for 2,3-dichloropyridine include a protection tank 1 and a heating tank 2 rotatably connected to the inner side of the protection tank 1, an upper cover 3 is installed on the upper end of the protection tank 1, a crushing assembly 4 for crushing the 2,3-dichloropyridine raw material is arranged on the upper end of the upper cover 3, and a ventilation assembly 5 for accelerating the cooling of the surface of the heating tank 2 is installed on the outer side of the protection tank 1.

[0036] In this embodiment, the crushing assembly 4 includes a crushing tank 41 fixedly connected to the inner side of the upper cover 3, the lower end of the crushing tank 41 is rotatably connected to the crushing cylinder 44, the upper end of the crushing cylinder 44 is fixedly connected to the funnel 49, the funnel 49 is located on the inner side of the crushing tank 41, the inner side of the funnel 49 is fixedly connected to a baffle 410, the top end of the inner wall of the crushing tank 41 is fixedly connected to a connecting column 46, the lower end of the connecting column 46 is fixedly connected to a cutter head 48, and a blade 47 is provided on the inner side of the crushing cylinder 44.

[0037] Specifically, the rotation of the pulverizing barrel 44 can drive the blade 47 to rotate, and cooperate with the cutter head 48 to grind the 2,3-dichloropyridine raw material to ensure the dissolution efficiency of the 2,3-dichloropyridine raw material. The baffle 410 inside the funnel 49 can stir the 2,3-dichloropyridine raw material to facilitate the falling of the 2,3-dichloropyridine raw material.

[0038] In this embodiment, a rotating groove 42 is opened on the inner side of the crushing tank 41, a rotating ring 43 is fixedly connected to the outer side of the crushing cylinder 44, and the rotating ring 43 is rotatably connected to the inner side of the rotating groove 42. A gear ring 45 is fixedly connected to the outer side of the crushing cylinder 44, and a half-size ring 7 is fixedly connected to the upper end of the heating tank 2, and the half-size ring 7 is meshed with the gear ring 45.

[0039] Specifically, the rotating ring 43 can be clamped by the rotating groove 42 to prevent the crushing tube 44 from falling, and the gear ring 45 can be driven to rotate by the half-size ring 7.

[0040] In this embodiment, the inner side of the crushing barrel 44 is fixedly connected to the lower hopper 411, and a baffle plate 415 is provided at the lower end of the lower hopper 411. The outer side of the baffle plate 415 is fixedly connected to the connecting shell 414. The inner side of the connecting shell 414 is rotatably connected to the fixing column 413, and the fixing column 413 is fixedly connected to the lower hopper 411. The outer side of the connecting shell 414 is fixedly connected to the toggle plate 412. A turning opening 417 is provided on the outer side of the crushing barrel 44, and the toggle plate 412 passes through the turning opening 417. A first spring piece 416 is provided on the inner side of the connecting shell 414, and one end of the first spring piece 416 is fixedly connected to the inner wall of the connecting shell 414, and the other end of the first spring piece 416 is fixedly connected to the fixing column 413.

[0041] A sealing cover 6 is provided at the upper end of the heating tank 2 . A feeding port 9 is provided at the upper end of the sealing cover 6 . A retaining ring 8 is fixedly connected to the upper end of the sealing cover 6 . The retaining ring 8 is fitted with the toggle plate 412 .

[0042] Specifically, the toggle plate 412 can be toggled by the baffle ring 8 to move the shielding plate 415 away from the lower end of the lower hopper 411, so that the 2,3-dichloropyridine raw material inside the lower hopper 411 falls into the inner side of the heating tank 2 through the discharge port 9, and the shielding plate 415 can block the lower end of the lower hopper 411 again through the first spring piece 416.

[0043] In this embodiment, an air inlet is opened on the outer side of the protection tank 1, and the ventilation assembly 5 includes a guard plate 51, one end of the guard plate 51 is fixedly connected to a sealing plate 52, the sealing plate 52 is matched with the air inlet, the upper and lower ends of the sealing plate 52 are rotatably connected to the first connecting rod 53, the first connecting rod 53 is slidably connected to the inner side of the air inlet, two groups of clamping rings 54 are fixedly connected to the outer side of the heating tank 2, one end of the first connecting rod 53 is fixedly connected to a clamping block 55, the clamping block 55 is matched with the clamping ring 54, and a heating plate 56 is arranged between the two groups of clamping blocks 55.

[0044] Specifically, the air inlet can be blocked by the sealing plate 52 to seal the protection tank 1, making it convenient for the heating plate 56 to heat the heating tank 2, and the clamping ring 54 can be clamped by the clamping block 55 to ensure the stable rotation of the heating tank 2.

[0045] In this embodiment, the lower end of the blocking block 55 is fixedly connected to a connecting plate 57, the inner side of the connecting plate 57 is slidably connected to a sliding rod 58, the sliding rod 58 is fixedly connected to the heating plate 56, the other end of the sliding rod 58 is fixedly connected to a retaining ring 510, a spring 59 is provided on the outer side of the sliding rod 58, and one end of the spring 59 is fixedly connected to the retaining ring 510.

[0046] Specifically, the spring 59 can be used to pull the retaining ring 510 so that the slide rod 58 pushes the heating plate 56 to be close to the heating tank 2, making it easier for the heating plate 56 to heat the heating tank 2.

[0047] In this embodiment, the inner side of the first connecting rod 53 is fixedly connected with a rotating shaft 511, and hidden grooves 512 are provided at the upper and lower ends of the sealing plate 52. A second elastic piece 513 is provided on the outer side of the rotating shaft 511, and the second elastic piece 513 is located on the inner side of the hidden groove 512. Two groups of first U-shaped plates 514 are fixedly connected to the outer side of the protective plate 51, and the inner side of the first U-shaped plate 514 is rotatably connected with a second connecting rod 515, and one end of the second connecting rod 515 is rotatably connected with a second U-shaped plate 516, and the second U-shaped plate 516 is fixedly connected to the protection tank 1.

[0048] Specifically, the spring 59 can pull the retaining ring 510 so that the slide rod 58 pushes the heating plate 56 to fit tightly against the heating tank 2. The second connecting rod 515 can pull the guard plate 51 to deflect. The inclined guard plate 51 can facilitate wind to enter the inner side of the protective tank 1, facilitate cooling of the heating tank 2, and accelerate the precipitation of 2,3-dichloropyridine.

[0049] A method for purifying 2,3-dichloropyridine, comprising: step 1: adding 2,3-dichloropyridine raw material to the inner side of a crushing tank 41, and then using a motor to drive the heating tank 2 inside the protective tank 1 to rotate, the rotation of the heating tank 2 will drive the sealing cover 6 to rotate, and the half-scale ring 7 can drive the gear ring 45 to rotate, and then drive the crushing cylinder 44 to rotate, at this time, the rotating ring 43 will rotate inside the rotating groove 42, and the cutter head 48 and the blade 47 can be used to grind the 2,3-dichloropyridine raw material, so that the ground 2,3-dichloropyridine raw material falls into the inner side of the lower hopper 411. The baffle 410 inside the funnel 49 can be used to stir the 2,3-dichloropyridine raw material to facilitate the falling of the 2,3-dichloropyridine raw material;

[0050] Step 2: When the baffle ring 8 rotates to the side of the crushing tank 41, the baffle ring 8 will toggle the toggle plate 412, so that the toggle plate 412 drives the connecting shell 414 to rotate on the fixed column 413, so that the shielding plate 415 is moved away from the lower end of the lower hopper 411, so that the 2,3-dichloropyridine raw material inside the lower hopper 411 falls into the inner side of the heating tank 2 through the discharge port 9. The rotation of the heating tank 2 can accelerate the dissolution of the 2,3-dichloropyridine raw material. When the toggle plate 412 is separated from the baffle ring 8, the first spring sheet 416 can be used to make the shielding plate 415 block the lower end of the lower hopper 411 again;

[0051] Step 3: When the sealing plate 52 is installed inside the air inlet, the first connecting rod 53 will push the clamping block 55 to clamp onto the clamping ring 54, so that the rotation of the heating tank 2 is more stable, and the heating plate 56 can heat the heating tank 2 at the same time. The spring 59 can pull the retaining ring 510 to make the sliding rod 58 push the heating plate 56 and the heating tank 2 to be close;

[0052] Step 4: After the mixing is completed, the sealing plate 52 is pulled out from the inside of the air inlet. At this time, the sealing plate 52 will be deflected between the two sets of first connecting rods 53 under the pull of the second connecting rod 515, so that the protective plate 51 is tilted toward the side of the second connecting rod 515, which is convenient for the outside wind to blow into the inside of the protection tank 1, facilitates the cooling of the heating tank 2, and accelerates the precipitation of 2,3-dichloropyridine.

[0053] When in use, the motor can drive the heating tank 2 to rotate to accelerate the dissolution of 2,3-dichloropyridine. The rotation of the heating tank 2 will drive the sealing cover 6 to rotate. The half-scale ring 7 can drive the gear ring 45 to rotate, and then drive the crushing tube 44 to rotate. At this time, the rotating ring 43 will rotate inside the rotating groove 42. The cutter head 48 and the blade 47 can grind the 2,3-dichloropyridine raw material, so that the ground 2,3-dichloropyridine raw material falls into the lower hopper 411. The inner side of the funnel 49 can be used to stir the 2,3-dichloropyridine raw material by using the inner baffle 410 of the funnel 49 to facilitate the falling of the 2,3-dichloropyridine raw material. When the baffle ring 8 rotates to the side of the crushing tank 41, the baffle ring 8 will toggle the toggle plate 412, so that the toggle plate 412 drives the connecting shell 414 to rotate on the fixed column 413, so that the shielding plate 415 is moved away from the lower end of the lower hopper 411, so that the 2,3-dichloropyridine raw material inside the lower hopper 411 falls into the lower hopper 411 through the lower opening 9. The inner side of the heating tank 2, the rotation of the heating tank 2 can accelerate the dissolution of the 2,3-dichloropyridine raw material. When the toggle plate 412 is separated from the baffle ring 8, the first spring plate 416 can be used to make the baffle plate 415 block the lower end of the lower hopper 411 again. When the sealing plate 52 is installed on the inner side of the air inlet, the first connecting rod 53 will push the block 55 to be stuck on the clamping ring 54, so that the rotation of the heating tank 2 is more stable. At the same time, the heating plate 56 can heat the heating tank 2, which is beneficial to the The spring 59 can pull the retaining ring 510 so that the slide rod 58 pushes the heating plate 56 to fit tightly against the heating tank 2. After mixing is completed, the sealing plate 52 is pulled out from the inside of the air inlet. At this time, the sealing plate 52 will deflect between the two groups of first connecting rods 53 under the pull of the second connecting rod 515, so that the protective plate 51 is tilted toward the side of the second connecting rod 515, which is convenient for the outside wind to blow into the inside of the protection tank 1, facilitates the cooling of the heating tank 2, and accelerates the precipitation of 2,3-dichloropyridine.

[0054] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A purification device for 2,3-dichloropyridine, comprising a protection tank (1) and a heating tank (2) rotatably connected to the inner side of the protection tank (1), characterized in that: The upper end of the protection tank (1) is mounted with an upper cover (3), and a pulverizing assembly (4) for pulverizing the 2,3-dichloropyridine raw material is arranged at the upper end of the upper cover (3). A ventilation assembly (5) for accelerating the cooling of the surface of the heating tank (2) is mounted on the outer side of the protection tank (1), and the pulverizing assembly (4) comprises a pulverizing tank (41) fixedly connected to the inner side of the upper cover (3), a pulverizing cylinder (44) is rotatably connected to the lower end of the pulverizing tank (41), and a funnel (49) is fixedly connected to the upper end of the pulverizing cylinder (44), and the funnel (49) is located on the inner side of the pulverizing tank (41), and a baffle (49) is fixedly connected to the inner side of the funnel (49). The top end of the inner wall of the crushing tank (41) is fixedly connected to a connecting column (46), the lower end of the connecting column (46) is fixedly connected to a cutter head (48), the inner side of the crushing cylinder (44) is provided with a blade (47), the inner side of the crushing tank (41) is provided with a rotating groove (42), the outer side of the crushing cylinder (44) is fixedly connected to a rotating ring (43), the rotating ring (43) is rotatably connected to the inner side of the rotating groove (42), the outer side of the crushing cylinder (44) is fixedly connected to a toothed ring (45), and the upper end of the heating tank (2) is fixedly connected to a half-size ring (7), the half-size ring (7) is meshed with the toothed ring (45).

2. A purification device for 2,3-dichloropyridine according to claim 1, characterized in that: The inner side of the crushing cylinder (44) is fixedly connected to a lower hopper (411), the lower end of the lower hopper (411) is provided with a shielding plate (415), the outer side of the shielding plate (415) is fixedly connected to a connecting shell (414), the inner side of the connecting shell (414) is rotatably connected to a fixing column (413), the fixing column (413) is fixedly connected to the lower hopper (411), the outer side of the connecting shell (414) is fixedly connected to a toggle plate (412), the outer side of the crushing cylinder (44) is provided with a turning opening (417), the toggle plate (412) passes through the turning opening (417), the inner side of the connecting shell (414) is provided with a first spring piece (416), one end of the first spring piece (416) is fixedly connected to the inner wall of the connecting shell (414), and the other end of the first spring piece (416) is fixedly connected to the fixing column (413).

3. A purification device for 2,3-dichloropyridine according to claim 2, characterized in that: The upper end of the heating tank (2) is provided with a sealing cover (6), the upper end of the sealing cover (6) is provided with a feeding port (9), the upper end of the sealing cover (6) is fixedly connected with a retaining ring (8), and the retaining ring (8) is in contact with the toggle plate (412).

4. A purification device for 2,3-dichloropyridine according to claim 1, characterized in that: An air inlet is provided on the outer side of the protection tank (1); the ventilation assembly (5) comprises a guard plate (51); one end of the guard plate (51) is fixedly connected to a sealing plate (52); the sealing plate (52) fits with the air inlet; upper and lower ends of the sealing plate (52) are rotatably connected to first connecting rods (53); the first connecting rods (53) are slidably connected to the inner side of the air inlet; two groups of clamping rings (54) are fixedly connected to the outer side of the heating tank (2); one end of the first connecting rod (53) is fixedly connected to a clamping block (55); the clamping block (55) fits with the clamping ring (54); a heating plate (56) is provided between the two groups of clamping blocks (55).

5. A purification device for 2,3-dichloropyridine according to claim 4, characterized in that: The lower end of the clamping block (55) is fixedly connected to a connecting plate (57), the inner side of the connecting plate (57) is slidably connected to a sliding rod (58), the sliding rod (58) is fixedly connected to the heating plate (56), the other end of the sliding rod (58) is fixedly connected to a retaining ring (510), and a spring (59) is provided on the outer side of the sliding rod (58), one end of the spring (59) is fixedly connected to the retaining ring (510).

6. A purification device for 2,3-dichloropyridine according to claim 5, characterized in that: The inner side of the first connecting rod (53) is fixedly connected to a rotating shaft (511); the upper and lower ends of the sealing plate (52) are both provided with hidden grooves (512); the outer side of the rotating shaft (511) is provided with a second elastic sheet (513); the second elastic sheet (513) is located on the inner side of the hidden groove (512); the outer side of the protective plate (51) is fixedly connected to two groups of first U-shaped plates (514); the inner side of the first U-shaped plate (514) is rotatably connected to a second connecting rod (515); one end of the second connecting rod (515) is rotatably connected to a second U-shaped plate (516); and the second U-shaped plate (516) is fixedly connected to the protection tank (1).

7. A method for purifying 2,3-dichloropyridine, applied to a purification device for 2,3-dichloropyridine according to any one of claims 1 to 6, characterized in that: include: Step 1: Add 2,3-dichloropyridine raw material to the inner side of the crushing tank (41), and then use a motor to drive the heating tank (2) inside the protection tank (1) to rotate. The rotation of the heating tank (2) drives the sealing cover (6) to rotate. The half-scale ring (7) can drive the gear ring (45) to rotate, and then drive the crushing cylinder (44) to rotate. At this time, the rotating ring (43) will rotate inside the rotating groove (42). The cutter head (48) and the blade (47) can be used to grind the 2,3-dichloropyridine raw material, so that the ground 2,3-dichloropyridine raw material falls into the inner side of the lower hopper (411). The inner baffle (410) of the funnel (49) can stir the 2,3-dichloropyridine raw material to facilitate the falling of the 2,3-dichloropyridine raw material; Step 2: When the retaining ring (8) rotates to the side of the crushing tank (41), the retaining ring (8) will toggle the toggle plate (412), so that the toggle plate (412) drives the connecting shell (414) to rotate on the fixed column (413), so that the shielding plate (415) moves away from the lower end of the lower hopper (411), so that the 2,3-dichloropyridine raw material inside the lower hopper (411) falls into the inner side of the heating tank (2) through the discharge port (9). The rotation of the heating tank (2) can accelerate the dissolution of the 2,3-dichloropyridine raw material. When the toggle plate (412) is separated from the retaining ring (8), the shielding plate (415) can be used to block the lower end of the lower hopper (411) again by using the first spring sheet (416); Step 3: When the sealing plate (52) is installed on the inner side of the air inlet, the first connecting rod (53) will push the clamping block (55) to clamp onto the clamping ring (54), so that the rotation of the heating tank (2) is more stable. At the same time, the heating plate (56) can heat the heating tank (2). The spring (59) can pull the retaining ring (510) so that the sliding rod (58) pushes the heating plate (56) and the heating tank (2) to be in close contact. Step 4: After the mixing is completed, the sealing plate (52) is pulled out from the inner side of the air inlet. At this time, the sealing plate (52) is pulled by the second connecting rod (515) to deflect between the two sets of first connecting rods (53), so that the protective plate (51) is tilted toward the side of the second connecting rod (515), so that the outside wind can be blown into the inner side of the protection tank (1), so as to facilitate the cooling of the heating tank (2) and accelerate the precipitation of 2,3-dichloropyridine.

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