A spray gun for leachate backspray

Abstract

This application relates to the field of landfill leachate treatment and provides a spray gun for leachate backspray, which includes a gun body, a gun head and an atomizing head installed on the gun body. The gun head is used to transport leachate; a compressed air pipe is sleeved on the outer wall of the gun head, and there is a gap between the compressed air pipe and the gun head to form a first air passage, and a first one-way valve is arranged in the air passage; a detachable mounting member is installed on the side of the gun head away from the gun head, and the mounting member is provided with a second air passage communicating with the first air passage, and a second one-way valve is arranged in the second air passage; the atomizing head is connected to the outer wall of the compressed air pipe, and there is a gap between the atomizing head and the mounting member. The atomizing head is provided with a plurality of spray ports arranged opposite to the second air passage, and all the spray ports are arranged at intervals around the axis of the atomizing head. For a spray gun for leachate backspray in this application, in order to reduce the situation that the leakage liquid flows back into the compressed air industrial pipeline.

Description

Technical Field

[0001] The present application relates to the field of landfill leachate treatment, in particular to a spray gun for leachate back-spraying. Background Art

[0002] Landfill leachate has the characteristics of complex composition, high content of heavy metal ions and salt, acidity, and high content of organic matter, which has an impact on the environment and therefore needs to be treated. Currently, landfill leachate is mostly treated by leachate back-spraying. In the leachate back-spraying treatment, the nozzle of the spray gun is injected deep into the incinerator for spraying to incinerate the leachate.

[0003] However, in actual application, it is found that the above conventional solutions have obvious shortcomings, especially under long-term operation conditions, because the nozzle is exposed to extreme working conditions for a long time, which easily leads to nozzle blockage. Once the nozzle is completely blocked by solid particles or other impurities, it will cause untreated liquid to flow back into the compressed air supply pipeline, thereby causing the risk of secondary contamination of the entire system, seriously affecting the normal operation of the equipment and increasing the subsequent maintenance costs. These problems need to be solved urgently. Summary of the invention

[0004] In order to reduce the situation where the leaked liquid flows back into the compressed air industrial pipeline, the present application provides a spray gun for leachate back-spraying.

[0005] The invention provides a spray gun for leachate back-spraying, which adopts the following technical scheme:

[0006] A spray gun for leachate back-spraying comprises a gun body, a gun head and an atomizing head mounted on the gun body, wherein the gun head is used to transport leachate; a compressed air pipe is sleeved on the outer wall of the gun head, a gap exists between the compressed air pipe and the gun head and a first air channel is formed, and a first one-way valve is arranged in the air channel; a detachable mounting part is mounted on the side of the gun head away from the gun head, the mounting part is provided with a second air channel connected with the first air channel, and the second air channel is provided with a second one-way valve; the atomizing head is connected to the outer wall of the compressed air pipe, and a gap exists between the atomizing head and the mounting part, the atomizing head is provided with a plurality of nozzles arranged opposite to the second air channel, and all the nozzles are arranged at intervals around the axis of the atomizing head.

[0007] By adopting the above technical solutions, by setting two groups of one-way valves, it is possible to prevent the leachate from flowing back into the air passage due to gravity or negative pressure, avoiding contamination of the compressed air system; if a small amount of leachate accidentally breaks through the first one-way valve, the second one-way valve can further block it to prevent the entire air passage from being contaminated; and the area can be directly exposed by removing the mounting part, and the residual liquid can be discharged by tilting or flushing, avoiding blockage caused by accumulation. By setting a plurality of nozzles, the nozzles circumferentially distributed on the atomizing head are arranged opposite to the air passage, ensuring that the compressed air impacts the leachate flow from multiple angles to form finer atomized particles.

[0008] Optionally, one end of the mounting part is provided with a first plug-in block, and a first slot for the first plug-in block to be inserted is opened at the end of the gun head far away from the gun body; the first plug-in block is provided with a first magnetic attracting member, and a second magnetic attracting member matched with the first magnetic attracting member is opened in the first slot.

[0009] By adopting the above technical solutions, the cooperation between the first plug-in block and the first slot realizes the rapid positioning and connection of the mounting part and the gun head, and the interaction between the first magnetic attracting member and the second magnetic attracting member further enhances the connection stability, effectively preventing loosening caused by high temperature or vibration, while simplifying the assembly process and improving the maintenance efficiency.

[0010] Optionally, the atomizing head is rotatably connected to the compressed air pipe through a rotating assembly, and a plurality of scraping plates are arranged on one side of the atomizing head close to the mounting part; one side of the scraping plate abuts against one end of the mounting part far away from the gun head; the scraping plate is located between two adjacent nozzles, and one end of the scraping plate far away from the mounting part is inclined.

[0011] By adopting the above technical solutions, when the atomizing head is rotatably connected to the compressed air pipe through a rotating assembly, and a plurality of scraping plates abutting against the mounting part are arranged on one side of the atomizing head close to the mounting part, this design applies force to the scraping plates when the compressed air is ejected through the nozzles, causing the atomizing head to rotate. As the atomizing head rotates, the scraping plates will continuously contact the mounting part and generate slight friction. This friction helps to remove the leachate residues that may accumulate on the surface of the mounting part or nearby, preventing them from having a negative impact on the atomizing effect.

[0012] Optionally, a plurality of crushing blocks are arranged on the side wall of the scraping plate.

[0013] By adopting the above technical solutions, the large pieces of materials are crushed by the crushing blocks, and the crushing blocks ensure that the leachate is in a finer and more uniform state before atomization. This helps the compressed air to mix more fully with the leachate, thereby generating a finer atomizing effect.

[0014] Optionally, a fixed plate and a sliding plate are arranged in the first air passage. The fixed plate is arranged on the side of the sliding plate away from the gun body. The fixed plate is provided with a first through hole, and the sliding plate is provided with a second through hole. The compressed air pipe is provided with a sliding groove, which extends around the outer peripheral side of the compressed air pipe, and the distance from the sliding groove to the fixed plate gradually increases along the axial direction of the gun head. An extension rod is fixed to the outer layer of the sliding plate, and the extension rod passes through the sliding groove and is movably arranged inside the sliding groove.

[0015] The rotating assembly is installed with a guiding block, which is used to abut against the extension rod and guide the extension rod to move away from the fixed plate. The gun head is installed with a torsion spring, and the two ends of the torsion spring are respectively connected to the gun head and the rotating assembly. The elastic force of the torsion spring is used to drive the guiding block to move away from the extension rod.

[0016] When there is compressed air in the first air passage, the compressed air forces the sliding plate to abut against the fixed plate. At this time, the first through hole and the second through hole are arranged opposite to each other. When the guiding block is connected to the extension rod and guides the extension rod to move away from the fixed plate, the first through hole and the second through hole are arranged in a staggered manner.

[0017] By adopting the above technical solution, when the first air passage is filled with compressed air, this compressed air will generate a certain pressure, forcing the sliding plate to closely adhere to the fixed plate. At this time, the first through hole and the second through hole are completely aligned, allowing the compressed air and the leachate to be mixed and sprayed out through the nozzle.

[0018] Meanwhile, as the spray head rotates, the guiding block will contact the extension rod and guide it to move away from the fixed plate. During this process, the first through hole and the second through hole will gradually be staggered, resulting in a decrease in the pressure of the compressed air. When this pressure decreases to a certain extent, the elastic force of the torsion spring will come into play, driving the guiding block to return to its original state and simultaneously driving the spray head to rotate in the reverse direction. This process will be repeated continuously, enabling the atomizing head to rotate back and forth.

[0019] This back-and-forth rotation of the atomizing head brings multiple advantages. Firstly, it can change the position and angle of the nozzle, enabling the atomized droplets to be more evenly distributed in the target area, thereby improving the uniformity and coverage of atomization. Secondly, the back-and-forth rotation helps to reduce the retention of impurities between the atomizing head and the mounting part, keeping the nozzle clean and unobstructed, and thus ensuring the atomization effect. Finally, this design effectively reduces the situation of leachate flowing back into the air passage, improving the stability and reliability of the entire spray gun system.

[0020] Optionally, the rotating assembly includes a fixed ring fixed to the gun head and a rotating ring rotatably connected to the fixed ring. The guiding block and the torsion spring are both connected to the rotating ring, and the atomizing head is detachably connected to the rotating ring. A cover is sleeved on the gun head, and the sliding groove covers the inside of the cover.

[0021] By adopting the above technical solution, the detachable connection between the atomizing head and the rotating ring increases the convenience of use and facilitates the replacement or maintenance of the atomizing head. The cover sleeved on the gun head not only protects the internal mechanical structure from damage by the external environment but also can maintain the pressure of the compressed air.

[0022] Optionally, the atomizing head is provided with a mounting block, and the rotating ring is provided with a mounting groove for the mounting block to be inserted. A first fixing groove is formed in the side wall of the mounting block, a fixing block is movably mounted in the first fixing groove, and a second fixing groove for the fixing block to be inserted is formed in the mounting groove. A spring is arranged between the fixing block and the first fixing groove, and the elastic force of the spring is used to drive the fixing block to be inserted into the second fixing groove under normal conditions.

[0023] By adopting the above technical solution, the cooperative design of the fixing block and the second fixing groove ensures the stability of the atomizing head during rotation. Even under high pressure or high-speed spraying conditions, the atomizing head can maintain a firm connection and is not easily detached or loosened. Moreover, the elastic force of the spring continuously acts on the fixing block, making it closely fit in the second fixing groove, enhancing the stability of the connection.

[0024] Optionally, a plurality of balls are rotatably mounted on the inner wall of the atomizing head, and the balls are abutted against the outer wall of the gun head.

[0025] By adopting the above technical solution, a plurality of balls are rotatably mounted on the inner wall of the atomizing head, and the balls are abutted against the outer wall of the gun head, which can significantly reduce the frictional resistance when the atomizing head rotates relative to the gun head and improve the smoothness of the rotation process. At the same time, this structural design helps to extend the service life of the components, reduce the wear problem caused by frequent use, and ensure the stable performance of the spray gun during long-term operation.

[0026] In summary, the present application includes at least one of the following beneficial technical effects:

[0027] 1. By providing the first one-way valve and the second one-way valve, it is possible to prevent the leachate from flowing back into the air passage due to gravity or negative pressure, avoiding contamination of the compressed air system. If a small amount of leachate accidentally breaks through the first one-way valve, the second one-way valve can further block it to prevent the entire air passage from being contaminated. And the residual liquid can be discharged by directly exposing this area by disassembling the mounting part and tilting or flushing, avoiding blockage caused by accumulation.

[0028] 2. By driving the atomizing head to rotate back and forth at the end of the gun head, sundries can be repeatedly crushed by the crushing blocks on the side where the two scraping plates approach each other, reducing the situation where sundries abut against one side of the scraping plate under normal centrifugal force, avoiding the accumulation or blockage of sundries near the nozzle, and thus ensuring that the spray gun can work continuously and stably. Brief Description of the Drawings

[0029] Figure 1 is a schematic structural diagram of Embodiment 1;

[0030] Figure 2 is a partial cross-sectional view of Embodiment 1;

[0031] Figure 3 is Figure 2 a partial enlarged view of part a of

[0032] Figure 4 is Figure 2 a partial enlarged view of part b of

[0033] Figure 5 is a partial cross-sectional view of Embodiment 2;

[0034] Figure 6 is Figure 5 a partial enlarged view of part c of

[0035] Figure 7 is a partial cross-sectional view of the cover of Embodiment 2.

[0036] Description of Reference Numerals: 1, gun body; 2, gun head; 21, first slot; 3, compressed air pipe; 31, first air passage; 32, second slot; 33, sliding slot; 34, cover; 35, first one-way valve; 4, mounting member; 41, first sleeve; 42, second sleeve; 43, second air passage; 44, first plug-in block; 45, second plug-in block; 46, second one-way valve; 5, atomizing head; 51, nozzle; 52, scraping plate; 53, crushing block; 54, mounting block; 55, first fixing groove; 56, spring; 57, fixing block; 58, hemispherical head; 6, rotating assembly; 61, fixing ring; 62, rotating ring; 63, mounting groove; 64, second fixing groove; 65, guiding block; 66, guiding surface; 67, torsion spring; 7, fixing plate; 71, first through hole; 8, sliding plate; 81, extension rod; 82, second through hole. Detailed Description of the Embodiments

[0037] The following further elaborates on the present application in conjunction with the attached Figures 1 - 7 drawings.

[0038] Embodiment 1

[0039] The embodiment of the present application discloses a spray gun for leachate backspray.

[0040] Reference Figure 1 and Figure 2 , a spray gun for leachate backspraying, comprising a gun body 1, a gun head 2, a compressed air pipe 3, a mounting member 4 and an atomizing head 5. The gun head 2 is connected to the gun body 1 for injecting leachate into the gun head 2. Among them, the compressed air pipe 3 is sleeved on the outer wall of the gun head 2, and a first air passage 31 is formed between the gun head 2 and the compressed air pipe 3. A first one-way valve 35 is installed in the first air passage 31, which only allows compressed air to flow in a specific direction to prevent the backflow of leachate.

[0041] Reference Figure 2 , the mounting member 4 includes a first sleeve 41 and a second sleeve 42, and the length of the first sleeve 41 is less than that of the second sleeve 42. The first sleeve 41 is inserted into the second sleeve 42, and a gap is formed between the first sleeve 41 and the second sleeve 42 to form a second air passage 43, which is used to communicate with the first air passage 31. A second one-way valve 46 is arranged in the second air passage 43. The first one-way valve 35 and the second one-way valve 46 have the same function and are both prior arts, so they will not be elaborated here.

[0042] Reference Figure 3 , one side of the first sleeve 41 is provided with a first plug-in block 44, and the gun head 2 is provided with a first slot 21 for the first plug-in block 44 to be inserted. The first plug-in block 44 is provided with a first magnetic member, and the first slot 21 is provided with a second magnetic member, and the first magnetic member and the second magnetic member are magnetically matched.

[0043] Reference Figure 2 , in this embodiment, the second sleeve 42 is provided with a second plug-in block 45, and the air passage is provided with a second slot 32 for the second plug-in block 45 to be inserted. Since the second plug-in block 45 has the same structure as the first plug-in block 44, it will not be elaborated here one by one.

[0044] Through the plug-in fit between the plug-in block and the plug-in slot, the rapid positioning and connection of the mounting member 4 and the gun head 2 can be realized, thereby increasing the connection stability, simplifying the assembly process at the same time, and improving the maintenance efficiency.

[0045] Reference Figure 2 , the atomizing head 5 is sleeved on the mounting member 4 and is connected to the compressed air pipe 3 through a rotating assembly 6. The atomizing head 5 abuts against one end of the second sleeve 42 away from the compressed air pipe 3, and there is a gap between the atomizing head 5 and the first sleeve 41. The atomizing head 5 is provided with a plurality of spray nozzles 51, and all the spray nozzles 51 are arranged at intervals around the axis of the atomizing head 5. When the spray gun is in use, the leachate passes through the gap between the atomizing head 5 and the first sleeve 41. At this time, the compressed air sprays the leachate from the spray nozzles 51 in the form of mist particles through the second passage.

[0046] On the inner wall of one side of the atomizing head 5 close to the first sleeve 41, a plurality of scraping plates 52 are provided. Each scraping plate 52 is respectively installed between two adjacent spray nozzles 51, and one end of the first scraping plate 52 far from the spray nozzle 51 is inclined and abuts against the first sleeve 41. When compressed air is ejected through the spray nozzle 51, a force is applied to the scraping plate 52, causing the atomizing head 5 to rotate. As the atomizing head 5 rotates, the scraping plate 52 will continuously contact the first sleeve 41 and generate slight friction. This friction helps to remove the leachate residues that may accumulate on or near the surface of the mounting member 4, preventing them from having a negative impact on the atomizing effect.

[0047] On the side wall of the scraping plate 52, a plurality of crushing blocks 53 are provided, which can crush larger particulate matter during the rotation process to reduce the risk of blockage. The crushing blocks 53 are made of cemented carbide or ceramic materials, with good strength and wear resistance, and can effectively cope with the impact of various solid impurities.

[0048] A plurality of balls (not shown in the figure) are installed on the inner wall of the atomizing head 5. One side of the balls abuts against the outer wall of the gun head 2. The balls are used to reduce the frictional resistance between the atomizing head 5 and the compressed air pipe 3, improve the smoothness of the rotation process, and reduce the wear problem caused by frequent use, ensuring the stable performance of the spray gun during long-term operation.

[0049] Referring to Figure 2 and Figure 4 , the rotating assembly 6 includes a fixed ring 61 and a rotating ring 62 connected. The fixed ring 61 is fixedly connected to the gun head 2, and the rotating ring 62 is rotatably connected thereto; on one side of the atomizing head 5, a mounting block 54 is provided, and the rotating ring 62 is provided with a mounting groove 63 for the mounting block 54 to be inserted; on the outer wall of the mounting block 54, a first fixing groove 55 is provided, and a fixing block 57 is movably installed in the first fixing groove 55. The mounting block 54 is provided with a second fixing groove 64 for the fixing block 57 to be inserted away from the mounting groove 63, and one end of the second fixing groove 64 far from the mounting groove 63 communicates with the outside.

[0050] One end of the fixing block 57 far from the first fixing groove 55 is provided with a hemispherical head 58, and the hemispherical head 58 is used to completely enter the first fixing groove 55; a spring 56 is provided between the fixing block 57 and the first fixing groove 55, and the elastic force of the spring 56 is used to drive the fixing block 57 to penetrate through the second fixing groove 64 to penetrate to the outside. The matching design of the fixing block 57 and the second fixing groove 64 ensures the stability of the atomizing head 5 during the rotation process and enables the atomizing head 5 to be disassembled, assembled and replaced, so as to remove and clean the mounting member 4 between the atomizing head 5 and the gun head 2 and maintain the atomizing effect of the spray gun.

[0051] The implementation principle of Embodiment 1 of this application is as follows:

[0052] By setting two sets of one-way valves, it is possible to prevent the leachate from flowing back into the air passage due to gravity or negative pressure, avoiding contamination of the compressed air system. If a small amount of leachate accidentally breaks through the first one-way valve 35, the second one-way valve 46 can further block it to prevent the entire air passage from being contaminated. And the area can be directly exposed by removing the mounting part 4, and the residual liquid can be discharged by tilting or flushing, avoiding blockage caused by accumulation.

[0053] Moreover, the nozzle 51 is disposed opposite to the second air passage 43, so that the compressed air can directly act on the area of the nozzle 51. This design ensures that the air flow can effectively wash the nozzle 51, preventing impurities in the leachate from accumulating at the nozzle 51, reducing the risk of blockage, and further reducing the possibility of the leakage liquid flowing back into the interior of the compressed air industrial pipeline.

[0054] Embodiment 2

[0055] An embodiment of the present application discloses a spray gun for leachate backspray.

[0056] Referring to Figure 5 and Figure 6 In Embodiment 2 of the present application, the difference from Embodiment 1 is that a fixing plate 7 and a sliding plate 8 are arranged in the first air passage 31. The fixing plate 7 is fixed to the first air passage 31, and the sliding plate 8 is slidably installed in the first air passage 31 and is located on the side of the fixing plate 7 away from the atomizing head 5. The fixing plate 7 is provided with a plurality of through first through holes 71, and all the first through holes 71 are arranged equidistantly around the central axis of the fixing plate 7. The sliding plate 8 is provided with a plurality of through second through holes 82, and all the second through holes 82 are arranged equidistantly around the central axis of the sliding plate 8.

[0057] Referring to Figure 7 On the outer peripheral wall of the compressed air pipe 3, a sliding groove 33 communicating with the first air passage 31 is provided. The sliding groove 33 is arranged around the outer wall of the compressed air pipe 3, and the distance from the sliding groove 33 to the fixing plate 7 gradually increases along the axial direction of the compressed air pipe 3. An extension rod 81 is fixed to the outside of the sliding plate 8, and the extension rod 81 passes through the sliding groove 33 and can freely slide in the sliding groove 33.

[0058] Referring to Figure 7 A guide block 65 is fixed to the rotating ring 62. The length of the guide block 65 is the same as the distance from the rotating ring 62 to the end of the sliding groove 33 away from the rotating ring 62. One side of the fixed block 57 is a guide surface 66, and the other side of the fixed block 57 is a reference surface. The distance between the guide surface 66 and the reference surface gradually decreases from the side close to the rotating ring 62 to the side far from the rotating ring 62. The guide surface 66 is used to abut against the extension rod 81 to guide the extension rod 81 to move toward the side away from the rotating ring 62.

[0059] A torsion spring 67 is sleeved on the outer wall of the compressed air pipe 3. A positioning portion is integrally formed on the outer wall of the compressed air pipe 3. One end of the torsion spring 67 is connected to the positioning portion, and the other end of the torsion spring 67 is fixed to the rotating ring 62. The elastic force of the torsion spring 67 is used to guide the fixing block 57 to rotate towards the side away from the extension rod 81.

[0060] A cover 34 is arranged on the outer wall of the gun head 2. The sliding groove 33 is covered inside the cover 34, and one side of the cover 34 abuts against the rotating ring 62; the cover 34 not only protects the internal mechanical structure from damage by the external environment, but also can maintain the pressure of the compressed air.

[0061] When there is compressed air in the first air passage 31, the compressed air forces the sliding plate 8 to abut against the fixed plate 7. At this time, the first through hole 71 and the second through hole 82 are arranged opposite to each other; when the guiding block 65 abuts against the extension rod 81 and guides the extension rod 81 to move towards the side away from the fixed plate 7, the first through hole 71 and the second through hole 82 are arranged in a staggered manner.

[0062] The implementation principle of Embodiment 2 of this application is as follows:

[0063] When the first air passage 31 is filled with compressed air, this compressed air will generate a certain pressure, forcing the sliding plate 8 to closely adhere to the fixed plate 7. At this time, the first through hole 71 and the second through hole 82 are completely aligned, allowing the compressed air and the leachate to be mixed and sprayed out through the spray nozzle 51.

[0064] Meanwhile, as the spray head rotates, the guiding block 65 will contact the extension rod 81 and guide it to move away from the fixed plate 7. During this process, the first through hole 71 and the second through hole 82 will gradually be misaligned, resulting in a decrease in the pressure of the compressed air. When this pressure decreases to a certain extent, the elastic force of the torsion spring 67 will come into play, driving the guiding block 65 to return to its original state, and at the same time driving the spray head to rotate in the reverse direction. This process will be repeated continuously, so that the atomizing head 5 can rotate back and forth.

[0065] During the back-and-forth rotation of the atomizing head 5, the crushing block 53 can break the sundries into smaller particles before they are thrown towards the scraping plate 52, thus greatly reducing the possibility of their normal contact with the scraping plate 52, reducing the situation where sundries abut against one side of the scraping plate 52 due to centrifugal force under normal conditions, and avoiding the accumulation or blockage of sundries near the spray nozzle 51, thereby ensuring that the spray gun can work continuously and stably.

[0066] The above is the preferred embodiment of this application. It does not limit the protection scope of this application accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. A spray gun for leachate back-spraying, characterized in that: The invention comprises a gun body (1), a gun head (2) and an atomizing head (5) mounted on the gun body (1), wherein the gun head (2) is used to transport leachate; a compressed air pipe (3) is sleeved on the outer wall of the gun head (2), a gap exists between the compressed air pipe (3) and the gun head (2) and a first air channel (31) is formed, and a first non-return valve is arranged in the first air channel (31); a detachable mounting member (4) is mounted on the side of the gun head (2) away from the gun body (1), the mounting member (4) is provided with a second air channel (43) connected to the first air channel (31), and the second air channel (43) is provided with a second non-return valve; the atomizing head (5) is connected to the outer wall of the compressed air pipe (3), and a gap exists between the atomizing head (5) and the mounting member (4), and the atomizing head (5) is provided with a plurality of nozzles (51) arranged opposite to the second air channel (43), and all the nozzles (51) are arranged at intervals around the axis of the atomizing head (5); The atomizing head (5) is rotatably connected to the compressed air pipe (3) via a rotating assembly (6); a plurality of scrapers (52) are provided on a side of the atomizing head (5) close to the mounting member (4); one side of the scraper (52) abuts against an end of the mounting member (4) away from the gun head (2); the scraper (52) is located between two adjacent nozzles (51), and an end of the scraper (52) away from the mounting member (4) is inclined; A fixed plate (7) and a sliding plate (8) are provided in the first air passage (31), wherein the fixed plate (7) is provided on a side of the sliding plate (8) away from the gun body (1); the fixed plate (7) is provided with a first through hole (71), and the sliding plate (8) is provided with a second through hole (82); the compressed air pipe (3) is provided with a sliding groove (33), wherein the sliding groove (33) extends around the outer circumference of the compressed air pipe (3), and the distance between the sliding groove (33) and the fixed plate (7) gradually increases along the axial direction of the gun head (2); an extension rod (81) is fixed to the outer layer of the sliding plate (8), wherein the extension rod (81) passes through the sliding groove (33) and is movably arranged inside the sliding groove (33); The rotating assembly (6) is provided with a guide block (65), the guide block (65) being used to abut against the extension rod (81), and the guide block (65) being used to guide the extension rod (81) to move toward a side away from the fixed plate (7); the gun head (2) is provided with a torsion spring (67), the two ends of the torsion spring (67) being respectively connected to the gun head (2) and the rotating assembly (6), and the elastic force of the torsion spring (67) is used to drive the guide block (65) to rotate toward a side away from the extension rod (81); When compressed air is present in the first air passage (31), the compressed air forces the sliding plate (8) to abut against the fixed plate (7), and at this time the first through hole (71) and the second through hole (82) are arranged opposite each other; when the guide block (65) is connected to the extension rod (81) and guides the extension rod (81) to move toward a side away from the fixed plate (7), the first through hole (71) and the second through hole (82) are arranged in an offset manner.

2. A spray gun for leachate back-spraying according to claim 1, characterized in that: A first plug-in block (44) is mounted on one end of the mounting member (4), and a first slot (21) for plugging the first plug-in block (44) is provided at one end of the gun head (2) away from the gun body (1); the first plug-in block (44) is provided with a first magnetic attraction member, and the first slot (21) is provided with a second magnetic attraction member that matches the first magnetic attraction member.

3. A spray gun for leachate back-spraying according to claim 1, characterized in that: A plurality of crushing blocks (53) are provided on the side wall of the scraper (52).

4. A spray gun for leachate back-spraying according to claim 1, characterized in that: The rotating assembly (6) comprises a fixed ring (61) fixed to the gun head (2) and a rotating ring (62) rotatably connected to the fixed ring (61); the guide block (65) and the torsion spring (67) are both connected to the rotating ring (62); the atomizing head (5) is detachably connected to the rotating ring (62); the gun head (2) is provided with a cover (34); and the sliding groove (33) is covered inside the cover (34).

5. A spray gun for leachate back-spraying according to claim 4, characterized in that; The atomizing head (5) is provided with a mounting block (54); the rotating ring (62) is provided with a mounting groove (63) for the mounting block (54) to be inserted into; a side wall of the mounting block (54) is provided with a first fixing groove (55), a fixing block (57) is movably installed in the first fixing groove (55), and the rotating ring (62) is provided with a second fixing groove (64) for the fixing block (57) to be inserted into; a spring (56) is provided between the fixing block (57) and the first fixing groove (55), and the elastic force of the spring (56) is used to drive the fixing block (57) to be inserted into the second fixing groove (64) under normal conditions.

6. A spray gun for leachate back-spraying according to claim 5, characterized in that: A plurality of balls are rotatably mounted on the inner wall of the atomizing head (5), and the balls are in contact with the outer wall of the gun head (2).

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