Pipeline inner wall anti-corrosion coating spraying device

Abstract

The invention discloses a spraying device for an anti-corrosion coating on the inner wall of a pipeline, and relates to the technical field of pipeline spraying. The spraying device comprises a pipe body, a spraying mechanism is arranged on the outer side of the plugging end, a discharging pipe is coaxially connected into the pipe body, and the discharging pipe coaxially penetrates through the plugging end of the pipe body and communicates with the spraying mechanism. Through the cooperative design of the scraper and the first annular box, when the pipe body moves in the pipeline and the inner wall of the pipeline is sprayed through the spraying mechanism, the thicker sprayed epoxy coating can be scraped off from the inner wall of the pipeline through the scraper, so that the epoxy coating is smeared uniformly, finally, when the hot air blower works, hot air enters the air inlet pipe, and the hot air enters the air inlet pipe; and the epoxy coating enters the first annular box through the through holes and is discharged from the air outlet holes in the outer side of the first annular box, so that the epoxy coating uniformly smeared on the inner wall of the pipeline is preliminarily dried, sizing of the epoxy coating is accelerated, and the hanging flow phenomenon of the epoxy coating is prevented.

Description

Technical Field

[0001] The present application relates to the technical field of pipeline spraying, and in particular to a device for spraying an anti-corrosion coating on the inner wall of a pipeline. Background Art

[0002] Epoxy coating is one of the most widely used anti-corrosion materials for pipeline inner walls. It has good chemical stability, high strength and high corrosion resistance. By spraying epoxy coating on the inner wall of the pipeline, corrosive media can be isolated from the inner wall of the pipeline, thereby extending the service life of the pipeline.

[0003] A traditional anti-corrosion coating spraying device for the inner wall of a pipeline generally consists of a horizontal pipe, a roller and a nozzle. One end of the horizontal pipe is connected to a solution pump through a hose. The nozzle is rotatably installed on the horizontal pipe and is driven by a motor to rotate. When the solution pump and the motor are operating at the same time, the epoxy coating is pumped into the horizontal pipe through the solution pump and sprayed out through the rotating nozzle. Under the action of the roller, the horizontal pipe can be pulled to the other end of the pipeline through the hose to spray the epoxy coating on the inner wall of the pipeline. However, when the epoxy coating is sprayed, it is easy to cause hanging on the inner wall of the pipeline due to various factors. The hanging coating will affect the smoothness of the inner wall of the pipeline, causing the anti-corrosion coating at this location to easily peel off or fall off, and the inner wall of the pipeline cannot be effectively protected. In order to reasonably improve this problem, the present application proposes a spraying device for the inner wall of the pipeline with an anti-corrosion coating. Summary of the Invention

[0004] The purpose of this application is to solve the technical problem that when epoxy coating is sprayed, it is easy to have a dripping phenomenon on the inner wall of the pipe due to various factors. The dripping of the coating will affect the smoothness of the inner wall of the pipe, causing the anti-corrosion coating at this location to easily peel off or fall off, and the inner wall of the pipe cannot be effectively protected. This application provides a device for spraying anti-corrosion coating on the inner wall of the pipe.

[0005] In order to achieve the above-mentioned purpose, this application specifically adopts the following technical solutions: A device for spraying an anti-corrosion coating on the inner wall of a pipeline, comprising: The tube body is provided with a spraying mechanism on the outside of the blocked end, a discharge pipe is coaxially connected to the tube body, the discharge pipe coaxially passes through the blocked end of the tube body and is connected to the spraying mechanism, the tube body and the open ends of the discharge pipe are respectively rotatably connected with an air inlet pipe and a feed pipe, a ring motor is installed on the outside of the air inlet pipe, and the tube body can be driven to rotate by the ring motor; The moving mechanism is connected to the air inlet pipe, and the pipe body can move in the pipe through the moving mechanism; The scraper is wound around the outside of the tube; Multiple through holes are distributed in a ring shape on the outside of the tube body. A first ring box is provided on the outside of the tube body and is connected to the multiple through holes. Multiple air outlets are distributed on the outside of the first ring box. The air inlet end of the air inlet pipe is connected to a hot air blower.

[0006] Furthermore, the moving mechanism includes a slide rail, a slider is slidably fitted on the slide rail, the air intake pipe is fixedly installed on the top of the slider, a screw rod is rotatably installed on the slide rail, and a servo motor is equipped to drive the screw rod to rotate, the screw rod is threadedly fitted with the slider, and a guide mechanism is provided on the outside of the air intake pipe.

[0007] Furthermore, the guide mechanism includes a plurality of connecting rods annularly hinged to the outside of the air intake pipe, the ends of the connecting rods are hinged with mounting plates, a plurality of rollers are rotatably mounted on the outside of the mounting plates, a sleeve is threadedly engaged with the outside of the air intake pipe, an annular sleeve is rotatably engaged with the end of the sleeve, a plurality of connecting rods are annularly hinged on the annular sleeve, and the connecting rods are hinged to the connecting rods one by one.

[0008] Furthermore, a mounting cylinder is coaxially provided on the outside of the tube body, the scraper is constructed on the outside of the mounting cylinder, the first annular box is connected to the mounting cylinder, and the mounting cylinder is connected to the second annular box. A plurality of arc-shaped grooves are distributed on one side of the scraper, and the arc-shaped grooves pass through the mounting cylinder and are connected to the second annular box. The second annular box is filled with filter cotton, and a negative pressure mechanism is provided at one end of the second annular box, through which the air in the second annular box can be extracted.

[0009] Furthermore, the scraper is spirally wound on the mounting cylinder.

[0010] Furthermore, the negative pressure mechanism includes a connecting tube annularly distributed on the inner wall of the second annular box, and a first flow channel and a second flow channel are spaced apart in the connecting tube, and the two are respectively connected to the first annular box through the through hole, and an annular cavity is constructed on the connecting tube, and the second annular box is connected to the first flow channel and the second flow channel through the annular cavity.

[0011] Furthermore, the inner wall of the second annular box is annularly distributed with partitions, and the other end of the second annular box is provided with a cover plate, which is detachably connected to the partitions. The filter cotton is arc-shaped and movably inserted between the multiple partitions.

[0012] Furthermore, the mounting tube is detachably connected to the tube body.

[0013] Furthermore, a mounting tube is coaxially connected to the mounting cylinder, and multiple connecting tubes pass through the mounting tube. An annular block is constructed on the outside of the tube body. The mounting tube is movably sleeved on the outside of the tube body and is detachably connected to the annular block.

[0014] Furthermore, the spraying mechanism includes a box body fixedly connected to the mounting pipe, a plurality of nozzles are distributed in a ring on the box body, a connecting port is constructed on one side of the box body, a slope is constructed inside the connecting port, and the discharge end of the discharge pipe is in contact with the slope and overlaps.

[0015] The beneficial effects of this application are as follows: The present application adopts a coordinated design of a scraper and a first annular box. When the pipe body moves in the pipe and the inner wall of the pipe is sprayed by the spraying mechanism, the scraper can be used to scrape off the thicker sprayed epoxy paint from the inner wall of the pipe, so as to spread the epoxy paint evenly. Finally, when the hot air blower is working, hot air enters the air inlet pipe, enters the first annular box through the through hole, and is discharged from the air outlet on the outside thereof, so as to preliminarily dry the epoxy paint evenly spread on the inner wall of the pipe, accelerate its shaping, and prevent the epoxy paint from hanging. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional structural diagram of this application; Figure 2 This application Figure 1 Schematic diagram of the local structure; Figure 3 This application Figure 2 A structural diagram from another angle; Figure 4 This is a cross-sectional view of the installation pipe structure of this application; Figure 5 This application Figure 4 A magnified view of point A; Figure 6 This is a cross-sectional view of the pipe structure of the present application; Reference numerals: 1, tube body; 2, spraying mechanism; 201, box body; 202, nozzle; 203, communication port; 204, inclined plane; 3, feed pipe; 4, air inlet pipe; 5, ring motor; 6, moving mechanism; 601, slide rail; 602, slider; 603, screw rod; 604, servo motor; 605, guide mechanism; 6051, connecting rod; 6052, mounting plate; 6053, roller; 6054, sleeve; 6055, ring sleeve; 6 056. Connecting rod; 7. Scraper; 8. Through hole; 9. First annular box; 10. Air outlet; 11. Hot air blower; 12. Mounting tube; 13. Second annular box; 14. Arc groove; 15. Filter cotton; 16. Negative pressure mechanism; 1601. Connecting pipe; 1602. First flow channel; 1603. Second flow channel; 1604. Annular cavity; 17. Partition; 18. Cover plate; 19. Mounting tube; 20. Annular block; 21. Connecting block; 22. Discharge pipe. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0018] like Figures 1-6 As shown, an embodiment of the present application provides a device for spraying an anti-corrosion coating on the inner wall of a pipeline, comprising: The pipe body 1 is blocked at one end, and a spraying mechanism 2 is provided on the outside of the blocked end. A discharge pipe 22 is coaxially connected to the pipe body 1, and an input end of the feed pipe 3 is installed on the existing solution pump. The discharge pipe 22 coaxially passes through the blocked end of the pipe body 1 and is communicated with the spraying mechanism 2. The open ends of the pipe body 1 and the discharge pipe 22 are rotatably connected with an air inlet pipe 4 and a feed pipe 3 respectively. The structure here is similar to the rotary nozzle 202. The end of the feed pipe 3 is communicated with the existing solution pump. When the solution pump is working, the epoxy paint can be drawn to the spraying mechanism 2 through the feed pipe 3 and sprayed on the inner wall of the pipe through the spraying mechanism 2. A ring motor 5 is installed on the outside of the air inlet pipe 4. The ring motor 5 is coaxially arranged on the air inlet pipe 4. The output end of the ring motor 5 is connected to the pipe body 1, and the pipe body 1 can be driven to rotate by the ring motor 5. When the pipe body 1 rotates, the spraying mechanism 2 can spray the epoxy paint on the inner wall of the pipe; The moving mechanism 6 is connected to the air inlet pipe 4. The pipe body 1 can move in the pipe through the moving mechanism 6. The ring motor 5 and the moving mechanism 6 operate synchronously. When the pipe body 1 moves, the epoxy coating can be sprayed on all sides of the inner wall of the pipe. The scraper 7 is wound around the outside of the pipe body 1, and the scraper 7 is coaxial with the pipe body 1. The outer side of the scraper 7 is close to the inner wall of the pipe. In this way, the epoxy coating on the thicker part of the inner wall of the pipe can be scraped off during the movement of the pipe body 1, so that the epoxy coating on the inner wall of the pipe is not easy to sag; A plurality of through holes 8 are annularly distributed on the outside of the pipe body 1. A first annular box 9 is provided on the outside of the pipe body 1. The outer diameter of the first annular box 9 is smaller than the outer diameter of the scraper 7 and is connected to the plurality of through holes 8. A plurality of air outlet holes 10 are distributed on the outside of the first annular box 9. The air inlet end of the air inlet pipe 4 is connected to a hot air blower 11. When the hot air blower 11 is working, it can heat the air and inject the heated air into the pipe body 1 through the air inlet pipe 4, and enter the first annular box 9 through the plurality of through holes 8, and then be discharged through the plurality of air outlet holes 10. Such a design can preheat the epoxy paint in the feed pipe 3. On the one hand, it is not easy to condense in the feed pipe 3. On the other hand, it can increase the activity of the epoxy paint molecules, thereby increasing the adhesion between the coating and the inner wall of the pipe. The hot air discharged from the first annular box 9 can preliminarily dry the epoxy paint on the inner wall of the pipe, accelerate its shaping, and prevent the epoxy paint from hanging. The present application adopts a coordinated design of a scraper 7 and a first annular box 9. When the pipe body 1 moves in the pipe and the inner wall of the pipe is sprayed by the spraying mechanism 2, the scraper 7 can scrape off the thicker sprayed epoxy paint from the inner wall of the pipe, thereby spreading the epoxy paint evenly. Finally, when the hot air blower 11 is working, hot air enters the air inlet pipe 4, enters the first annular box 9 through the through hole 8, and is discharged from the air outlet 10 on the outside thereof, so as to preliminarily dry the epoxy paint evenly spread on the inner wall of the pipe, accelerate its shaping, and prevent the epoxy paint from hanging.

[0019] like Figure 1 and Figure 3 As shown, in some embodiments, the moving mechanism 6 includes a slide rail 601, a slider 602 is slidably fitted on the slide rail 601, the air intake pipe 4 is fixedly mounted on the top of the slider 602, a screw rod 603 is rotatably mounted on the slide rail 601, and a servo motor 604 is provided for driving the screw rod 603 to rotate, the screw rod 603 is threadedly fitted with the slider 602, and the servo motor 604 works to drive the screw rod 603 to rotate, so that the slider 602 can move on the slide rail 601 and insert the air intake pipe 4 into the pipe, and a guide mechanism 605 is provided on the outside of the air intake pipe 4, which can guide and support the air intake pipe 4 during its movement, so that the scraper 7 is not likely to collide with the inner wall of the pipe during its movement.

[0020] like Figure 3 As shown, in some embodiments, the guide mechanism 605 includes a plurality of connecting rods 6051 annularly hinged to the outside of the air inlet pipe 4, the number of the connecting rods 6051 is four, and the acute angle formed by the connecting rods 6051 and the outside of the air inlet pipe 4 is away from the pipe body 1. The ends of the connecting rods 6051 are hinged with mounting plates 6052, and the connecting rods 6051 are hinged to the middle of the mounting plate 6052. A plurality of rollers 6053 are rotatably installed on the outside of the mounting plate 6052, and the rollers 6053 are in contact with the inner wall of the pipe. The outer thread of the air inlet pipe 4 is matched with a sleeve 6054, and the sleeve 6054 is hexagonal. In order to drive it to rotate by a tool, the end of the sleeve 6054 is rotatably matched with an annular sleeve 6055, and a plurality of connecting rods 6056 are hinged in a ring on the annular sleeve 6055, and the connecting rods 6056 are hinged to the connecting rods 6051 one by one. When the sleeve 6054 is driven to rotate, the sleeve 6054 can drive the annular sleeve 6055 to move toward the pipe body 1. At this time, the connecting rod 6051 can be driven to rotate along the hinge point through the connecting rod 6056 to unfold the multiple mounting plates 6052 and make the rollers 6053 on them contact the inner wall of the pipe, so as to position the mounting plates 6052 and prevent them from moving further.

[0021] like Figure 2 and Figure 4As shown, in some embodiments, a mounting cylinder 12 is coaxially provided on the outside of the tube body 1, and a distance is provided between the inner wall of the mounting cylinder 12 and the tube body 1. The scraper 7 is constructed on the outside of the mounting cylinder 12, and the first annular box 9 is connected to the mounting cylinder 12. The mounting cylinder 12 is connected to the second annular box 13, and the second annular box 13 is provided on the inner wall of the mounting cylinder 12. A plurality of arcuate grooves 14 are distributed on one side of the scraper 7. The arcuate grooves 14 are located on the side of the scraper 7 facing the spraying mechanism 2. The arcuate grooves 14 pass through the mounting cylinder 12 and are connected to the second annular box 13. The second annular box 13 is filled with Filter cotton 15, the filter cotton 15 is activated carbon filter cotton 15, and a negative pressure mechanism 16 is provided at one end of the second annular box 13. The air in the second annular box 13 can be extracted through the negative pressure mechanism 16. When the negative pressure mechanism 16 is in operation, a negative pressure is formed in the second annular box 13, thereby sucking the atomized epoxy paint floating in the air and the excess epoxy paint cleaned by the scraper 7 into the second annular box 13 through the notch of the arc groove 14, and filtering and intercepting the epoxy paint through the filter cotton 15. By collecting the atomized epoxy paint, the risk of occupational diseases for workers can be reduced.

[0022] like Figure 2 As shown, in some embodiments, the scraper 7 is spirally wound on the mounting tube 12, so that when the scraper 7 rotates in the pipe body 1, it moves along a spiral path in the pipe, which can effectively improve the coverage and scraping efficiency of the scraper 7.

[0023] like Figure 4 and Figure 5 As shown, in some embodiments, the negative pressure mechanism 16 includes four connecting pipes 1601 distributed annularly on the inner wall of the second annular box 13. Figure 5 As shown, a first flow channel 1602 and a second flow channel 1603 are provided in the connecting tube 1601, and the two are respectively connected to the through hole 8 and the first annular box 9. The first flow channel 1602 is connected to the through hole 8. An annular cavity 1604 is constructed on the connecting tube 1601. The second annular box 13 is connected to the first flow channel 1602 and the second flow channel 1603 through the annular cavity 1604. The structure here is similar to a vacuum generator, that is, when the air in the tube body 1 passes through the connecting tube 1601 quickly, the gas entering the second flow channel 1603 through the first flow channel 1602 can suck away the air in the annular cavity 1604 and the second annular box 13.

[0024] like Figure 4As shown, in some embodiments, partitions 17 are distributed in a ring shape on the inner wall of the second annular box 13, and there are four partitions 17. The other end of the second annular box 13 has a cover 18, and the cover 18 is detachably connected to the partitions 17. The two are connected by a bolt assembly. The second annular box 13 can be opened by removing the cover 18. The filter cotton 15 is arc-shaped and movably inserted between multiple partitions 17. In this way, the filter space can be fully utilized to ensure the filtering efficiency while the filter cotton 15 can be easily removed and cleaned.

[0025] like Figure 3 、 Figure 4 and Figure 6 As shown, in some embodiments, the mounting tube 12 is detachably connected to the pipe body 1. By adopting a detachable connection design, by replacing the mounting tubes 12 with different outer diameters and cooperating with the sleeve 6054 to adjust the expanded size of the multiple mounting plates 6052, it can adapt to pipes of different diameters.

[0026] like Figure 3 、 Figure 4 and Figure 6 As shown, in some embodiments, a mounting tube 19 is coaxially connected to the mounting cylinder 12, and the mounting tube 19 is slidably sleeved on the outside of the tube body 1. The mounting tube 19 and the mounting cylinder 12 are connected to each other through a connecting block 21. The second annular box 13 is located between the mounting tube 19 and the mounting cylinder 12. Multiple connecting tubes 1601 all pass through the mounting tube 19. By adopting the design of the mounting tube 19, on the one hand, the connecting tube 1601 can be protected so that it is not easily deformed and damaged during disassembly. On the other hand, the spacing between the connecting tube 1601 and the through hole 8 can be filled by the mounting tube 19, thereby improving the sealing performance after the two are connected. An annular block 20 is constructed on the outside of the tube body 1, and the mounting tube 19 is movably sleeved on the outside of the tube body 1 and is detachably connected to the annular block 20. The two are connected by a bolt assembly. By detaching the annular block 20 from the mounting tube 19, the mounting cylinder 12 can be removed.

[0027] like Figure 4 As shown, in some embodiments, the spraying mechanism 2 includes a box body 201 fixedly connected to the mounting tube 19, the box body 201 is coaxial with the mounting tube 19, and a plurality of nozzles 202 are distributed in a ring on the box body 201. The nozzles 202 are tilted, and a connecting port 203 is constructed on one side of the box body 201. A slope 204 is constructed inside the connecting port 203. After the annular block 20 is fixed to the mounting tube 19, the discharge end of the discharge pipe 22 contacts and overlaps the slope 204. This design makes the spraying mechanism 2 detachable, so that the nozzle 202 can spray close to the inner wall of the pipe without affecting the disassembly and assembly of the mounting tube 19.

[0028] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present application. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A device for spraying anti-corrosion coating on inner wall of pipeline, characterized in that: include: The pipe body (1) is provided with a spraying mechanism (2) on the outside of the blocked end, the pipe body (1) is coaxially connected with a discharge pipe (22), the discharge pipe (22) coaxially passes through the blocked end of the pipe body (1) and is connected with the spraying mechanism (2), the pipe body (1) and the discharge pipe (22) are respectively rotatably connected with an air inlet pipe (4) and a feed pipe (3) at the open end, the air inlet pipe (4) is provided with a ring motor (5) on the outside, and the pipe body (1) can be driven to rotate by the ring motor (5); A moving mechanism (6) is connected to the air intake pipe (4), and the air intake pipe (4) can move within the pipe through the moving mechanism (6); A scraper (7) is wound around the outside of the tube body (1); A plurality of through holes (8) are distributed in an annular manner on the outside of the tube body (1); a first annular box (9) is provided on the outside of the tube body (1) and is in communication with the plurality of through holes (8); a plurality of air outlet holes (10) are distributed on the outside of the first annular box (9); and a hot air blower (11) is connected to the air inlet end of the air inlet pipe (4).

2. The pipeline inner wall anti-corrosion coating spraying device according to claim 1 is characterized in that: The moving mechanism (6) comprises a slide rail (601), a slider (602) is slidably engaged with the slide rail (601), an air intake pipe (4) is fixedly mounted on the top of the slider (602), a screw rod (603) is rotatably mounted on the slide rail (601), and a servo motor (604) is provided for driving the screw rod (603) to rotate, the screw rod (603) is threadedly engaged with the slider (602), and a guide mechanism (605) is provided on the outside of the air intake pipe (4).

3. The pipeline inner wall anti-corrosion coating spraying device according to claim 2, characterized in that: The guide mechanism (605) comprises a plurality of connecting rods (6051) hinged in an annular manner to the outside of the air intake pipe (4), the ends of the connecting rods (6051) being hinged with mounting plates (6052), the outer sides of the mounting plates (6052) being rotatably mounted with a plurality of rollers (6053), the outer side of the air intake pipe (4) being threadedly engaged with a sleeve (6054), the end of the sleeve (6054) being rotatably engaged with an annular sleeve (6055), the annular sleeve (6055) being hinged in an annular manner with a plurality of connecting rods (6056), and the connecting rods (6056) being hinged in a one-to-one correspondence with the connecting rods (6051).

4. The pipeline inner wall anti-corrosion coating spraying device according to claim 3 is characterized in that: A mounting tube (12) is coaxially provided on the outside of the tube body (1), the scraper (7) is constructed on the outside of the mounting tube (12), the first annular box (9) is connected to the mounting tube (12), and the mounting tube (12) is connected to the second annular box (13), a plurality of arc-shaped grooves (14) are distributed on one side of the scraper (7), the arc-shaped grooves (14) pass through the mounting tube (12) and are connected to the second annular box (13), the second annular box (13) is filled with filter cotton (15), and a negative pressure mechanism (16) is provided at one end of the second annular box (13), and the air in the second annular box (13) can be extracted through the negative pressure mechanism (16).

5. The pipeline inner wall anti-corrosion coating spraying device according to claim 4 is characterized in that: The scraper (7) is spirally wound on the mounting cylinder (12).

6. The pipeline inner wall anti-corrosion coating spraying device according to claim 4, characterized in that: The negative pressure mechanism (16) includes a connecting tube (1601) distributed in an annular shape on the inner wall of the second annular box (13), wherein a first flow channel (1602) and a second flow channel (1603) are provided in the connecting tube (1601) at intervals, and the first flow channel (1602) and the second flow channel (1603) are respectively connected to the through hole (8) and the first annular box (9), and an annular cavity (1604) is constructed on the connecting tube (1601), and the second annular box (13) is connected to the first flow channel (1602) and the second flow channel (1603) through the annular cavity (1604).

7. The pipeline inner wall anti-corrosion coating spraying device according to claim 4, characterized in that: The inner wall of the second annular box (13) is provided with partitions (17) in an annular pattern. The other end of the second annular box (13) is provided with a cover plate (18). The cover plate (18) is detachably connected to the partitions (17). The filter cotton (15) is arc-shaped and is movably inserted between the plurality of partitions (17).

8. The pipeline inner wall anti-corrosion coating spraying device according to claim 4 is characterized in that: The mounting cylinder (12) is detachably connected to the pipe body (1).

9. The pipeline inner wall anti-corrosion coating spraying device according to claim 8, characterized in that: A mounting tube (19) is coaxially connected to the mounting cylinder (12), and a plurality of connecting tubes (1601) all pass through the mounting tube (19). An annular block (20) is constructed on the outside of the tube body (1). The mounting tube (19) is movably sleeved on the outside of the tube body (1) and is detachably connected to the annular block (20).

10. The pipeline inner wall anti-corrosion coating spraying device according to claim 9, characterized in that: The spraying mechanism (2) comprises a box body (201) fixedly connected to the mounting pipe (19), a plurality of nozzles (202) are distributed in an annular manner on the box body (201), a communication port (203) is constructed on one side of the box body (201), an inclined surface (204) is constructed in the communication port (203), and a discharge end of the discharge pipe (22) is in contact with and overlaps the inclined surface (204).

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