Stable inhibitor on-line premixing device for urea production

Abstract

The application belongs to the technical field of mixing, and specifically discloses a kind of inhibitor online premixing device for stability urea production, including mixing tank, the top of mixing tank is fixedly installed with stirring motor, the output shaft end of stirring motor is fixedly connected with stirring paddle, stirring paddle is rotatably connected in the inside of mixing tank, and the inside of mixing tank is fixedly installed with partition plate;Feeding assembly is used for quantitative feeding of urea and inhibitor, and feeding assembly is connected with mixing tank and stirring paddle;Discharge assembly is used for discharging urea and inhibitor mixed solution after premixing, and discharge assembly is connected with mixing tank and stirring paddle.Through the setting of feeding assembly, in the process that urea is discharged into the inside of mixing tank through feeding assembly, inhibitor will be discharged into the inside of mixing tank according to fixed proportion together, and makes inhibitor in dispersed state and mixes with urea, avoids caking, improves the mixing efficiency of urea and inhibitor, and reduces mixing time.

Description

Technical Field

[0001] This invention belongs to the field of mixing technology, and specifically relates to an online premixing device for inhibitors used in the production of stable urea. Background Technology

[0002] Mixing refers to the process of combining different substances to form a homogeneous body. It is widely used in the industrial field. In the industrial field, mixing refers to the unit operation of achieving uniform dispersion of materials through mechanical or fluid dynamics. It includes methods such as blending, kneading, and mixing. The process can be divided into three stages: convective mixing, shearing action, and diffusion equilibrium.

[0003] Urea is an organic compound mainly composed of carbon, oxygen, nitrogen, and hydrogen, and is produced using a high-temperature, high-pressure synthesis process. During urea production, inhibitors need to be pre-added to maintain the stability of the produced urea. Current technology typically involves directly adding the inhibitor to the urea for mixing. However, inhibitors are usually in powder form, while urea in the processing stage is in a molten, liquid state, causing the inhibitor to easily clump upon contact with urea. In this situation, the time required for the mixing device to uniformly premix the inhibitor and urea is too long, which is detrimental to stable urea production. Therefore, designing an online inhibitor premixing device for stable urea production is a problem we currently need to solve. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing an online premixing device for inhibitors in the production of stable urea.

[0005] To achieve the above objectives, the present invention provides an online premixing device for inhibitors in the production of stable urea, comprising a mixing tank, a stirring motor fixedly installed on the top of the mixing tank, a stirring paddle fixedly connected to the end of the output shaft of the stirring motor, the stirring paddle being rotatably connected inside the mixing tank, and a partition plate fixedly installed inside the mixing tank.

[0006] A feeding assembly for quantitatively feeding urea and inhibitors, the feeding assembly including a transmission component and a feeding component, the feeding assembly being connected to the mixing tank and the stirring paddle;

[0007] The feeding component includes a conical sleeve, inside which a guide plate and a filter screen are fixedly installed, and inside which a sliding component and a scraper are slidably connected, and on the outer wall of the conical sleeve a material box is fixedly connected, and inside which a spiral conveying rod is rotatably connected, and on one side of the spiral conveying rod a water wheel is fixedly connected, and on the outer wall of the water wheel a liquid inlet pipe is rotatably connected, and inside which a sealing arc component is fixedly installed;

[0008] A discharge assembly is used to discharge the premixed urea and inhibitor mixture, and the discharge assembly is connected to the mixing tank and the agitator.

[0009] In the above technical solution, the transmission component further includes a first gear fixedly installed on the outer wall of the stirring paddle, a toothed ring meshing on the outer wall of the first gear, a reciprocating lead screw fixedly connected to the top of the toothed ring, a lead screw sleeve sleeved on the outer wall of the reciprocating lead screw, and an I-shaped piston fixedly installed on the outer wall of the lead screw sleeve.

[0010] In the above technical solution, two sealing sleeves are symmetrically fixedly installed on the inner wall of the I-shaped piston component, and valves are slidably connected inside the two sealing sleeves. An air box is slidably connected to the outer wall of the I-shaped piston component, and the air box is fixedly installed inside the mixing tank. The toothed ring is rotatably connected to the bottom of the air box.

[0011] In the above technical solution, the outer wall of the gas box is further provided with a first gas pipe and a second gas pipe, the ends of the first gas pipe and the second gas pipe away from the gas box are fixedly connected to the outer wall of the conical sleeve, and the conical sleeve is fixedly installed inside the mixing tank.

[0012] In the above technical solution, the scraper is slidably connected to the top of the filter screen, the scraper is fixedly connected to the bottom of the slide, the material box is fixedly installed inside the mixing tank, a sealing cap is inserted into the top of the material box, and the liquid inlet pipe is fixedly installed inside the mixing tank.

[0013] In the above technical solution, the discharge assembly further includes a cover plate rotatably connected to the outer wall of the stirring paddle, a separator fixedly installed at the bottom of the cover plate, the cover plate and the separator fixedly installed inside the mixing tank, a second gear fixedly connected to the end of the stirring paddle away from the stirring motor, a large gear layer of a double-layer gear meshing with the outer wall of the second gear, a third gear meshing with the outer wall of the small gear layer of the double-layer gear, and the double-layer gear rotatably connected to the bottom of the cover plate.

[0014] In the above technical solution, the third gear is rotatably connected to the bottom of the second gear, the bottom of the third gear is rotatably connected to a first connecting rod, the end of the first connecting rod away from the third gear is rotatably connected to a first piston plate, the first piston plate is slidably connected inside the separator, and multiple one-way valves are fixedly installed inside the separator.

[0015] In the above technical solution, the outer wall of the first piston plate is rotatably connected to a second connecting rod, the second connecting rod is disposed at the bottom of the third gear and the first connecting rod, the end of the second connecting rod away from the first piston plate is fixedly connected to the second piston plate, the first piston plate is slidably connected inside the separator, and the outer wall of the mixing tank is fixedly connected to a drain pipe.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] By setting up a feeding assembly, as urea is discharged into the mixing tank through the feeding assembly, the inhibitor is discharged into the mixing tank at a fixed ratio, so that urea and inhibitor enter the mixing tank at a fixed ratio of 100:2. This ensures that the inhibitor is dispersed and mixed with urea, avoiding clumping, improving the mixing efficiency of urea and inhibitor, and reducing mixing time. At the same time, inhibitors that have clumped due to improper storage can be ground up and mixed with urea, further improving the efficiency of uniform mixing.

[0018] By setting up a discharge component, after the urea and inhibitor are mixed to form a mixture, it will fall to the bottom of the inner wall of the mixing tank, be continuously drawn by the discharge component and discharged through the discharge pipe, and used to supply subsequent processing steps. This avoids the mixing device discharging the entire tank of urea and inhibitor mixture, which would prevent subsequent processing steps from processing it in time, causing the inhibitor to precipitate inside the urea and affecting the quality of the urea after production. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure proposed in this invention;

[0020] Figure 2 This is a cross-sectional view of the mixing tank structure proposed in this invention;

[0021] Figure 3 This is a first-view structural cross-sectional view of the feeding assembly proposed in this invention;

[0022] Figure 4 The present invention proposes Figure 3 Enlarged view of the A-section structure;

[0023] Figure 5 This is a second-view structural cross-sectional view of the feeding assembly proposed in this invention;

[0024] Figure 6 This is an enlarged view of the material discharge assembly structure proposed in this invention;

[0025] Figure 7 This is a cross-sectional view of the material discharge assembly structure proposed in this invention.

[0026] In the diagram: 1. Mixing tank; 2. Stirring motor; 3. Stirring paddle; 4. First gear; 5. Gear ring; 6. Reciprocating lead screw; 7. Lead screw sleeve; 8. I-shaped piston; 9. Sealing sleeve; 10. Valve; 11. Air box; 12. First air pipe; 13. Second air pipe; 14. Conical sleeve; 15. Guide plate; 16. Sliding component; 17. Scraper; 18. Filter screen; 19. Material box; 20. Sealing cover; 21. Screw conveyor; 22. Water wheel; 23. Liquid inlet pipe; 24. Sealing arc component; 25. Divider plate; 26. Cover plate; 27. Divider component; 28. Second gear; 29. ​​Double-layer gear; 30. Third gear; 31. First connecting rod; 32. First piston plate; 33. Second connecting rod; 34. Second piston plate; 35. Check valve; 36. Drain pipe. Detailed Implementation

[0027] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] like Figures 1 to 2 The illustrated online premixing device for inhibitors in stable urea production includes a mixing tank 1, a stirring motor 2 fixedly mounted on the top of the mixing tank 1, a stirring paddle 3 fixedly connected to the output shaft end of the stirring motor 2, the stirring paddle 3 being rotatably connected inside the mixing tank 1, and a partition plate 25 fixedly mounted inside the mixing tank 1; a feeding assembly for quantitatively feeding urea and inhibitors, the feeding assembly including a transmission component and a feeding component, the feeding assembly being connected to the mixing tank 1 and the stirring paddle 3; and a discharging assembly for discharging the premixed urea and inhibitor mixture, the discharging assembly being connected to the mixing tank 1 and the stirring paddle 3.

[0029] like Figures 2 to 5 As shown, the feeding component includes a conical sleeve 14. A guide plate 15 and a filter screen 18 are fixedly installed inside the conical sleeve 14. A sliding component 16 and a scraper 17 are slidably connected inside the conical sleeve 14. The scraper 17 is slidably connected to the top of the filter screen 18 and fixedly connected to the bottom of the sliding component 16. A material box 19 is fixedly connected to the outer wall of the conical sleeve 14. The material box 19 is fixedly installed inside the mixing tank 1. A sealing cover 20 is inserted into the top of the material box 19. A spiral conveying rod 21 is rotatably connected inside the material box 19. A water wheel 22 is fixedly connected to one side of the spiral conveying rod 21. An inlet pipe 23 is rotatably connected to the outer wall of the water wheel 22. A sealing arc component 24 is fixedly installed inside the inlet pipe 23. The inlet pipe 23 is fixedly installed inside the mixing tank 1.

[0030] The transmission components include a first gear 4 fixedly installed on the outer wall of the stirring paddle 3, a gear ring 5 meshing on the outer wall of the first gear 4, a reciprocating screw 6 fixedly connected to the top of the gear ring 5, a screw sleeve 7 sleeved on the outer wall of the reciprocating screw 6, an I-shaped piston 8 fixedly installed on the outer wall of the screw sleeve 7, two sealing sleeves 9 symmetrically fixedly installed on the inner wall of the I-shaped piston 8, valves 10 slidably connected inside the two sealing sleeves 9, an air box 11 slidably connected to the outer wall of the I-shaped piston 8, the air box 11 fixedly installed inside the mixing tank 1, the gear ring 5 rotatably connected to the bottom of the air box 11, a first air pipe 12 and a second air pipe 13 fixedly connected to the outer wall of the air box 11, the ends of the first air pipe 12 and the second air pipe 13 away from the air box 11 fixedly connected to the outer wall of the conical sleeve 14, and the conical sleeve 14 fixedly installed inside the mixing tank 1;

[0031] The feeding assembly is used to quantitatively feed urea and inhibitors, and disperses the inhibitors during feeding. It also grinds and disperses any inhibitors that have clumped due to improper storage during feeding, ensuring that no clumping occurs when urea and inhibitors come into contact.

[0032] Specifically, when the staff connects the inlet pipe 23 to the external pipeline, puts the inhibitor into the material box 19, and starts the mixing device, the urea is discharged into the inlet pipe 23, and the stirring motor 2 drives the stirring paddle 3 to rotate.

[0033] During this process, urea drives the water wheel 22 inside the inlet pipe 23 to rotate and discharge into the mixing tank 1. The rotation of the water wheel 22 drives the screw conveyor 21 to rotate, so that the screw conveyor 21 conveys the inhibitor inside the material box 19 to the inside of the conical sleeve 14 through the screw, so that urea and inhibitor are fed synchronously. By setting the conveying ratio of water wheel 22 and screw conveyor 21 to 50:1 for one rotation, the feeding ratio of urea to inhibitor is a fixed ratio of 100:2 (mass ratio of urea to inhibitor). At the same time, by setting the contour of the sealing arc 24 to match the outer contour of the rotation trajectory of the inlet pipe 23, when the water wheel 22 is pushed by urea through the sealing arc 24, the water wheel 22... The blades, in conjunction with the sealing arc 24, seal the inlet pipe 23, ensuring that urea can only be discharged into the mixing tank 1 by driving the water wheel 22 to rotate. This allows the water wheel 22 to rotate according to the amount of urea entering the mixing tank 1 through the inlet pipe 23. Consequently, the amount of inhibitor driven by the water wheel 22 through the screw conveyor 21 into the conical sleeve 14 is kept in a fixed ratio with the amount of urea discharged into the mixing tank 1. This prevents changes in the amount of urea that drives the water wheel 22 to rotate once, which could lead to errors in the urea and inhibitor feeding ratio. It also prevents workers from manually adding urea and inhibitor, which could result in errors in the urea and inhibitor addition ratio and affect the quality of the finished urea product.

[0034] During this process, the stirring paddle 3 drives the gear ring 5 to rotate via the first gear 4, causing the gear ring 5 to drive the screw sleeve 7 to move up and down via the reciprocating screw 6. This, in turn, causes the screw sleeve 7 to drive the I-shaped piston 8 to move up and down along the inside of the air box 11. As the I-shaped piston 8 rises along the inside of the air box 11, the gas inside the space between the top of the I-shaped piston 8 and the air box 11 is compressed. This gas pushes the valve 10 inside the sealing sleeve 9 at the top of the I-shaped piston 8 down, sealing the corresponding sealing sleeve 9. The remaining gas is then discharged into the conical sleeve 14 through the second air pipe 13. As the I-shaped piston 8 rises along the air box 11, the bottom of the I-shaped piston 8... The space between the part and the air box 11 will gradually increase to generate negative pressure. The negative pressure will attract the valve 10 inside the bottom sealing sleeve 9 of the I-shaped piston 8 to descend, stop the sealing of the corresponding sealing sleeve 9, and allow outside gas to be drawn into the space between the bottom of the I-shaped piston 8 and the air box 11. When the I-shaped piston 8 descends along the inside of the air box 11, the space between the top of the I-shaped piston 8 and the air box 11 will increase to generate negative pressure, attracting outside gas to enter. The space between the bottom of the I-shaped piston 8 and the air box 11 will decrease, and the compressed gas will be discharged into the conical sleeve 14 through the first air pipe 12, so that the gas will be continuously discharged into the conical sleeve 14 without any gaps.

[0035] Furthermore, after the inhibitor is discharged into the conical sleeve 14 by the spiral conveyor 21, it will be blown down by the gas discharged from the first air pipe 12 or the second air pipe 13, causing the inhibitor to disperse inside the conical sleeve 14 and be discharged from the conical sleeve 14 through the filter screen 18. This allows the inhibitor to enter the mixing tank 1 in a dispersed state. At this time, the inhibitor will fall downwards and mix with the urea. Since the inhibitor is in a dispersed state, it will not come into contact with the urea and cause agglomeration. This improves the uniform premixing efficiency of urea and inhibitor by the stirring paddle 3, reduces the mixing time, and avoids the time required for uniform mixing of urea and inhibitor being too long, which would affect subsequent processing steps.

[0036] Furthermore, when gas is discharged into the conical sleeve 14 through the second air pipe 13, the gas pushes the slider 16 to slide along the inside of the conical sleeve 14 and abut against the connection between the conical sleeve 14 and the first air pipe 12, sealing the connection between the first air pipe 12 and the conical sleeve 14. This prevents the gas inside the conical sleeve 14 from being re-absorbed and discharged back into the space between the gas box 11 and the bottom of the I-shaped piston 8 through the first air pipe 12. When gas is discharged into the conical sleeve 14 through the first air pipe 12, it pushes the slider 16 against the connection between the second air pipe 13 and the conical sleeve 14. The connection is sealed to prevent gas backflow. During this process, the slider 16 will be pushed to move back and forth inside the conical sleeve 14, causing the slider 16 to drive the scraper 17 to slide on top of the filter screen 18. This grinds up the inhibitor that cannot enter the mixing tank 1 because it is blocked by the filter screen 18 due to clumping. The clumps of inhibitor can then be discharged into the mixing tank 1 after being ground up. The ground up inhibitor will fall downwards in a dispersed state and mix with the urea, avoiding clumping of the inhibitor due to improper storage and mixing with the urea, which would affect the efficiency of uniform mixing.

[0037] like Figures 6 to 7 As shown, the discharge assembly includes a cover plate 26 rotatably connected to the outer wall of the stirring paddle 3. A separator 27 is fixedly installed at the bottom of the cover plate 26. The cover plate 26 and the separator 27 are fixedly installed inside the mixing tank 1. A second gear 28 is fixedly connected to the end of the stirring paddle 3 away from the stirring motor 2. The outer wall of the second gear 28 is meshed with the large gear layer of a double-layer gear 29. The outer wall of the small gear layer of the double-layer gear 29 is meshed with a third gear 30. The double-layer gear 29 is rotatably connected to the bottom of the cover plate 26. The third gear 30 is rotatably connected to the bottom of the second gear 28. The bottom of the third gear 30 is rotatably connected to the first gear 28. A first connecting rod 31 is rotatably connected to a first piston plate 32 at the end of the first connecting rod 31 away from the third gear 30. The first piston plate 32 is slidably connected inside the partition 27. Multiple one-way valves 35 are fixedly installed inside the partition 27. A second connecting rod 33 is rotatably connected to the outer wall of the first piston plate 32. The second connecting rod 33 is located at the bottom of the third gear 30 and the first connecting rod 31. A second piston plate 34 is fixedly connected to the end of the second connecting rod 33 away from the first piston plate 32. The first piston plate 32 is slidably connected inside the partition 27. A drain pipe 36 is fixedly connected to the outer wall of the mixing tank 1.

[0038] Among them, the discharge component is used to discharge the urea and inhibitor mixture that has been uniformly mixed by the agitator 3 inside the mixing tank 1 from the mixing device;

[0039] Specifically, during the mixing process of urea and inhibitor by the rotation of the agitator 3, the agitator 3 drives the third gear 30 to rotate via the second gear 28 and the double-layer gear 29. The third gear 30 drives the first connecting rod 31 to rotate continuously, which in turn causes the first connecting rod 31 to pull the first piston plate 32 to move back and forth along the inside of the separator 27. The first piston plate 32 drives the second piston plate 34 to move back and forth synchronously via the second connecting rod 33. During this process, the first piston plate 32 and the second piston plate 34 alternately draw the mixture of urea and inhibitor from the mixing tank 1 through the one-way valve 35 away from the drain pipe 36, and alternately discharge it through the one-way valve 35 near the drain pipe 36. The discharged urea and inhibitor... The mixture is discharged from the mixing device through the drain pipe 36 to achieve the effect of continuously discharging the urea and inhibitor mixture for use in subsequent processing steps. This avoids the mixing device discharging the entire tank of urea and inhibitor mixture, which would prevent subsequent processing steps from processing it in time, causing the inhibitor to precipitate inside the urea and affecting the quality of the urea after production. It should be noted that the partition plate 25 is set to divide the interior of the mixing tank 1 into multiple interconnected cavities, separating the urea and inhibitor at different mixing stages. Only the urea and inhibitor mixture that has been mixed by the agitator 3 after passing through the partition plate 25 can fall to the bottom of the inner wall of the mixing tank 1, ensuring that the urea and inhibitor mixture discharged by the discharge component is a fully mixed mixture.

[0040] Working principle: During the process of urea (molten urea in liquid state) being discharged into the mixing tank 1 through the feeding component, the inhibitor is discharged into the mixing tank 1 together in a fixed ratio, and the inhibitor is dispersed and mixed with the urea to avoid clumping, improve the mixing efficiency of urea and inhibitor, and reduce the mixing time. After the urea and inhibitor have been mixed to form a mixture, it will fall to the bottom of the inner wall of the mixing tank 1, be continuously drawn by the discharge component and discharged through the drain pipe 36 to supply subsequent production processes.

[0041] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. An online premixing device for inhibitors in stable urea production, comprising a mixing tank (1), characterized in that, A stirring motor (2) is fixedly installed on the top of the mixing tank (1). A stirring paddle (3) is fixedly connected to the end of the output shaft of the stirring motor (2). The stirring paddle (3) is rotatably connected inside the mixing tank (1). A partition plate (25) is fixedly installed inside the mixing tank (1). The feeding assembly is used to quantitatively feed urea and inhibitors. The feeding assembly includes a transmission component and a feeding component. The feeding assembly is connected to the mixing tank (1) and the stirring paddle (3). The feeding component includes a conical sleeve (14), inside which a guide plate (15) and a filter screen (18) are fixedly installed. Inside the conical sleeve (14), a sliding component (16) and a scraper (17) are slidably connected. The outer wall of the conical sleeve (14) is fixedly connected to a material box (19), inside which a spiral conveying rod (21) is rotatably connected. One side of the spiral conveying rod (21) is fixedly connected to a water wheel (22), the outer wall of the water wheel (22) is rotatably connected to an inlet pipe (23), and inside the inlet pipe (23) is a sealing arc component (24). The transmission component includes a first gear (4) fixedly installed on the outer wall of the stirring paddle (3). A toothed ring (5) meshes with the outer wall of the first gear (4). A reciprocating lead screw (6) is fixedly connected to the top of the toothed ring (5). A lead screw sleeve (7) is sleeved on the outer wall of the reciprocating lead screw (6). An I-shaped piston (8) is fixedly installed on the outer wall of the lead screw sleeve (7). Two sealing sleeves (9) are symmetrically fixedly installed on the inner wall of the I-shaped piston (8). A valve (10) is slidably connected inside each of the two sealing sleeves (9). The outer wall of the I-shaped piston (8) is slidably connected to an air box (11), the air box (11) is fixedly installed inside the mixing tank (1), the toothed ring (5) is rotatably connected to the bottom of the air box (11), the outer wall of the air box (11) is fixedly connected to a first air pipe (12) and a second air pipe (13), the ends of the first air pipe (12) and the second air pipe (13) away from the air box (11) are fixedly connected to the outer wall of a conical sleeve (14), the conical sleeve (14) is fixedly installed inside the mixing tank (1); The discharge assembly is used to discharge the premixed urea and inhibitor mixture, and the discharge assembly is connected to the mixing tank (1) and the agitator (3).

2. The online premixing device for inhibitors in stable urea production according to claim 1, characterized in that, The scraper (17) is slidably connected to the top of the filter screen (18), the scraper (17) is fixedly connected to the bottom of the slide (16), the material box (19) is fixedly installed inside the mixing tank (1), the top of the material box (19) is fitted with a sealing cap (20), and the liquid inlet pipe (23) is fixedly installed inside the mixing tank (1).

3. The online premixing device for inhibitors in stable urea production according to claim 1, characterized in that, The discharge assembly includes a cover plate (26) rotatably connected to the outer wall of the stirring paddle (3). A separator (27) is fixedly installed at the bottom of the cover plate (26). The cover plate (26) and the separator (27) are fixedly installed inside the mixing tank (1). A second gear (28) is fixedly connected to one end of the stirring paddle (3) away from the stirring motor (2). The outer wall of the second gear (28) is meshed with the large gear layer of the double-layer gear (29). The outer wall of the small gear layer of the double-layer gear (29) is meshed with a third gear (30). The double-layer gear (29) is rotatably connected to the bottom of the cover plate (26).

4. The online premixing device for inhibitors in stable urea production according to claim 3, characterized in that, The third gear (30) is rotatably connected to the bottom of the second gear (28). The bottom of the third gear (30) is rotatably connected to the first connecting rod (31). The end of the first connecting rod (31) away from the third gear (30) is rotatably connected to the first piston plate (32). The first piston plate (32) is slidably connected inside the separator (27). Multiple one-way valves (35) are fixedly installed inside the separator (27).

5. The online premixing device for inhibitors in stable urea production according to claim 4, characterized in that, The outer wall of the first piston plate (32) is rotatably connected to a second connecting rod (33), the second connecting rod (33) is located at the bottom of the third gear (30) and the first connecting rod (31), the end of the second connecting rod (33) away from the first piston plate (32) is fixedly connected to a second piston plate (34), the first piston plate (32) is slidably connected to the inside of the separator (27), and the outer wall of the mixing tank (1) is fixedly connected to a drain pipe (36).

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