A device for applying anticorrosive paint to the joint of PCCP pipeline

Abstract

The utility model relates to PCCP pipeline installation field discloses a device of anticorrosive paint brushing to PCCP pipeline joint, include: portable bottom plate, door frame, telescopic component, roll brush and spray material component, door frame sets up on the bottom plate, is equipped with the lifting plate that can move up and down in the door frame, telescopic component one side is connected to the lifting plate, and roll brush sets up in the side of telescopic component away from the lifting plate, the utility model discloses a door frame is set up on the bottom plate, as the basic structure of lifting plate moving up and down, when moving up and down on the lifting plate, telescopic component adjusts the length according to the distance between roll brush and PCCP pipeline joint, makes roll brush be able to stick to PCCP pipeline joint, and roll brush is brushed with anticorrosive paint in the joint of one side of PCCP pipeline, then through the bottom plate to the joint of the other side of PCCP pipeline is brushed to the replacement of the process that construction personnel brushes in the prior art to PCCP pipeline joint, can effectively reduce the labor intensity.

Description

Technical Field

[0001] This utility model relates to the field of PCCP pipeline installation, specifically to a device for applying anti-corrosion coating to the joints of PCCP pipelines. Background Technology

[0002] PCCP (Prestressed Concrete Cylinder Pipe) is a type of pipe widely used in water conservancy projects, municipal water supply and drainage, and other fields. It consists of multiple pipe sections spliced ​​together using socket and spigot joints, resulting in circumferential joints in PCCP pipes. To ensure the sealing of PCCP pipes, cement mortar needs to be applied to the joints, and then an anti-corrosion coating needs to be applied to the outside of the cement mortar to ensure that its service life meets design requirements.

[0003] In the existing technology, due to the large size of PCCP pipes, the joints of spliced ​​PCCP pipes are usually coated with anti-corrosion paint manually, which results in high labor intensity. For the coating process on the top of the PCCP pipe joints, construction workers need to use ladders to go up and down the PCCP pipes. Since there are no effective safety protection measures at the top of the PCCP pipes, there are still significant safety hazards.

[0004] Therefore, a device for applying anti-corrosion coating to the joints of PCCP pipes is proposed. Utility Model Content

[0005] This invention provides a device for applying anti-corrosion coating to the joints of PCCP pipes to solve the aforementioned technical problems.

[0006] Specifically, this utility model is: a device for applying anti-corrosion coating to the joints of PCCP pipes, comprising: a movable base plate, a gantry frame, a telescopic component, a roller brush, and a spraying component; The portal frame is mounted on the base plate, and a lifting plate that can move up and down is installed inside the portal frame; One end of the telescopic component is connected to the lifting plate, and the other end is connected to the roller brush. The roller brush's shaft is set horizontally. The telescopic component is used to make the roller brush fit tightly against the joint of the PCCP pipe. The spraying assembly is used to spray anti-corrosion coating onto the roller brush.

[0007] Specifically, the portal frame has a horizontal plate inside, and a drive motor is provided on the bottom plate. The output shaft of the drive motor passes through the horizontal plate and is connected to a vertically arranged threaded rod. The threaded rod is rotatably arranged between the horizontal plate and the top plate of the portal frame, and a lifting plate is threadedly engaged with the outside of the threaded rod. The drive motor is used to drive the threaded rod to rotate, so as to drive the lifting plate to move up and down.

[0008] Furthermore, a guide rod parallel to the threaded rod is provided between the horizontal plate and the top plate of the portal frame. The guide rod passes through the lifting plate and slides with the lifting plate.

[0009] Furthermore, each of the two vertical plates of the portal frame is provided with a limiting groove on its facing surface, and the limiting groove is arranged parallel to the threaded rod; each of the two sides of the lifting plate is provided with a limiting block that is embedded in the limiting groove and slides.

[0010] Furthermore, the telescopic assembly includes a fixed sleeve plate, a movable insert plate, and a second hydraulic telescopic rod; one side of the fixed sleeve plate is hinged to the lifting plate, and the opposite side is provided with a first sliding groove, in which the movable insert plate is disposed and can slide; one end of the second hydraulic telescopic rod is connected to the fixed sleeve plate, and the other end is connected to the movable insert plate; the roller brush is disposed on the side of the movable insert plate away from the lifting plate.

[0011] Furthermore, it also includes a first hydraulic telescopic rod, one end of which is hinged to the lifting plate and the other end is hinged to the fixed sleeve plate, which is hinged to the lifting plate. The first hydraulic telescopic rod is used to make the fixed sleeve plate rotate around the hinge point between the fixed sleeve plate and the lifting plate.

[0012] Specifically, the telescopic assembly has a fixed plate and a mounting frame connected sequentially on the side away from the lifting plate, and the roller brush is mounted on the mounting frame; the spraying assembly includes a storage tank, a suction pump, a guide pipe, and a nozzle; the storage tank is mounted on the base plate, and the suction pump is connected to the storage tank; the nozzle is mounted on the fixed plate and faces the roller brush, and is connected to the suction pump through the guide pipe, for spraying anti-corrosion coating onto the roller brush.

[0013] Furthermore, the fixed plate is provided with a flow guiding cavity, which is connected to a suction pump through a material guide pipe; multiple nozzles are provided, each of which is connected to the flow guiding cavity and faces the roller brush, for spraying anti-corrosion coating onto the roller brush.

[0014] Compared with the prior art, this utility model has the following advantages and beneficial effects: This invention utilizes a gantry frame on the base plate as the foundation for the vertical movement of the lifting platform. During the platform's movement, the telescopic component adjusts its extension length according to the distance between the roller brush and the PCCP pipe joint, ensuring the roller brush adheres tightly to the joint. A spraying component then sprays anti-corrosion coating onto the roller brush, which rolls over the joint to apply the coating to one side of the PCCP pipe. The base plate is then moved to the other side of the joint for further application. This replaces the existing method of manual coating of the PCCP pipe joints by construction workers, effectively reducing labor intensity and avoiding the need for workers to repeatedly move up and down the PCCP pipe when coating the top of the joint, thus preventing safety hazards during the process and in situations involving working at height. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the device structure of this utility model.

[0016] Figure 2 This is a schematic diagram of the detailed structure of this utility model.

[0017] Figure 3 This is a schematic diagram of the device from another perspective.

[0018] Figure 4 This is a side view of the device of this utility model.

[0019] Figure 5 This is a structural schematic diagram of another embodiment of the portal frame.

[0020] Figure 6 This is a schematic diagram showing the positional relationship between the flow guide cavity, the fixing plate, and the roller brush in one embodiment.

[0021] The meanings of the labels in the diagram are as follows: Base plate—1; Lifting plate—101; Limiting block—102; Casters—103; Portal frame—2; Horizontal plate—201; Threaded rod—202; Drive motor—203; Guide rod—204; Limiting groove—205; First hydraulic telescopic rod—206; Telescopic assembly—3; Fixed sleeve plate—301; First sliding groove—302; Movable insert plate—303; Second hydraulic telescopic rod—304; Mounting bracket—305; Roller brush - 4; Spraying assembly—5; Storage tank—501; Suction pump—502; Feed guide pipe—503; Nozzle—504; Fixed plate—601; Guide cavity—602. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model, so as to provide a better understanding of the concept of the present utility model, the technical problem solved, the technical features constituting the technical solution and the technical effects brought about.

[0023] like Figures 1-5 As shown, an apparatus for applying anti-corrosion coating to the joints of PCCP pipes includes: a movable base plate 1, a gantry frame 2, a telescopic component 3, a roller brush 4, and a spraying component 5. The portal frame 2 is mounted on the base plate 1, and the portal frame 2 is equipped with a lifting plate 101 that can move up and down. One end of the telescopic component 3 is connected to the lifting plate 101, and the other end is connected to the roller brush 4. The rotating shaft of the roller brush 4 is set horizontally. The telescopic component 3 is used to make the roller brush 4 fit tightly against the joint of the PCCP pipe. The spraying assembly 5 is used to spray anti-corrosion coating onto the roller brush 4.

[0024] In this invention, a base plate 1 is placed on the ground next to the PCCP pipe, and a gantry frame 2 is provided on the base plate 1, which serves as a limiting structure for the lifting plate 101. When the lifting plate 101 moves up and down within the gantry frame 2, the distance between the roller brush 4 and the PCCP pipe joint is adjusted by the extension and retraction of the telescopic component 3, allowing the roller brush 4 to be in close contact with the PCCP pipe joint. Anti-corrosion coating is then sprayed onto the roller brush 4 by the spraying component 5, and the roller brush 4 applies the anti-corrosion coating to the PCCP pipe joint. For the entire PCCP pipe joint, one side of the joint can be coated first, and then the base plate 1 can be moved to the other side of the joint to complete the coating of the other side. The movement can be achieved by installing moving wheels 103 at the bottom of the base plate 1. To prevent the base plate 1 from moving during the coating process due to the moving wheels 103, the moving wheels 103 need to be equipped with a braking structure. Therefore, the process of applying anti-corrosion coating to the joints of PCCP pipes can replace the existing process of construction workers applying anti-corrosion coating to the joints of PCCP pipes. This can effectively reduce labor intensity and avoid the situation where construction workers need to constantly go up and down the PCCP pipes when applying anti-corrosion coating to the top of the joints of PCCP pipes, thus avoiding the safety hazards that exist during the up and down process and in the air.

[0025] It should be noted that the shape of the PCCP pipe joint is arc-shaped, and the movement trajectory of the roller brush 4 should be consistent with the arc shape to ensure that the roller brush 4 can fit tightly against the PCCP pipe joint. The movement trajectory of the roller brush 4 can be decomposed into variable speed movement in the horizontal direction and uniform speed movement in the vertical direction. The variable speed movement in the horizontal direction is realized by the telescopic component 3, and the uniform speed movement in the vertical direction is realized by the lifting plate 101.

[0026] As a preferred embodiment, such as Figure 1 , Figure 2 and Figure 3 As shown, the portal frame 2 has a horizontal plate 201 inside, and a drive motor 203 is provided on the bottom plate 1. The output shaft of the drive motor 203 passes through the horizontal plate 201 and is connected to a vertically arranged threaded rod 202. The threaded rod 202 is rotatably disposed between the horizontal plate 201 and the top plate of the portal frame 2. A lifting plate 101 is also threadedly engaged with the outside of the threaded rod 202. The drive motor 203 is used to drive the threaded rod 202 to rotate, so as to drive the lifting plate 101 to move up and down.

[0027] In this embodiment, a horizontal plate 201 is provided inside the portal frame 2, and a rotatable threaded rod 202 is provided between the horizontal plate 201 and the top plate of the portal frame 2. The rotation of the threaded rod 202 can be achieved by setting rotating bearings on the top plate and the horizontal plate 201 of the portal frame 2 respectively. The drive motor 203 can be fixed on the base plate 1, and the output shaft is set vertically upward. It is connected to the threaded rod 202 through a coupling, and the drive motor 203 drives the threaded rod 202 to rotate. Since the lifting plate 101 is also set inside the portal frame 2 and is threadedly engaged with the threaded rod 202, when the threaded rod 202 rotates, the lifting plate 101 will move up and down inside the portal frame 2 with the rotation of the threaded rod 202. In this way, the up and down movement of the lifting plate 101, combined with the extension and retraction of the telescopic component 3, allows the roller brush 4 to be tightly attached to the joint of the PCCP pipe, thus completing the coating process. The purpose of setting the horizontal plate 201 is to provide an installation position for the threaded rod 202, and at the same time to separate the lifting plate 101 from the drive motor 203, so as to avoid the lifting plate 101 pressing on the drive motor 203 when it descends excessively. It should be noted that the lifting plate 101 needs to be limited in the above process to prevent the lifting plate 101 from rotating with the threaded rod 202. Specifically, this can be achieved by pressing the two sides of the lifting plate 101 against the inner walls of the two sides of the gantry frame 2, so as to prevent the lifting plate 101 from rotating with the threaded rod 202.

[0028] As a further embodiment, such as Figure 1 , Figure 2 and Figure 3 As shown, a guide rod 204 parallel to the threaded rod 202 is also provided between the horizontal plate 201 and the top plate of the portal frame 2. The guide rod 204 passes through the lifting plate 101 and slides with the lifting plate 101.

[0029] In this embodiment, when the lifting plate 101 moves up and down under the drive of the drive motor 203, it slides with the guide rod 204 and is limited by the guide rod 204 to prevent the lifting plate 101 from rotating during the up and down movement, thereby improving the stability of the roller brush 4 during use.

[0030] As a further embodiment, such as Figure 5 As shown, a limiting groove 205 is provided on the facing surfaces of the two vertical plates of the portal frame 2, and the limiting groove 205 is arranged parallel to the threaded rod 202; the lifting plate 101 is provided on both sides with limiting blocks 102 that are embedded in the limiting groove 205 and slide.

[0031] In this embodiment, each of the two vertical plates of the portal frame 2 is provided with a limiting groove 205 parallel to the threaded rod 202. Correspondingly, each side of the lifting plate 101 is provided with a limiting block 102 that is embedded in the two limiting grooves 205 and slides. When the threaded rod 202 is driven to rotate by the drive motor 203, the lifting plate 101 is limited by the limiting block 102 embedded in the limiting groove 205, which can also prevent the lifting plate 101 from rotating with the threaded rod 202.

[0032] As a further embodiment, such as Figures 1-5 As shown, the telescopic assembly 3 includes a fixed sleeve plate 301, a movable insert plate 303, and a second hydraulic telescopic rod 304; one side of the fixed sleeve plate 301 is hinged to the lifting plate 101, and the opposite side is provided with a first sliding groove 302, and the movable insert plate 303 is disposed in the first sliding groove 302 and can slide; one end of the second hydraulic telescopic rod 304 is connected to the fixed sleeve plate 301, and the other end is connected to the movable insert plate 303; the roller brush 4 is disposed on the side of the movable insert plate 303 away from the lifting plate 101.

[0033] In this embodiment, by controlling the extension and retraction of the second hydraulic telescopic rod 304, the movable insert plate 303 is driven to slide within the fixed sleeve plate 301, thereby realizing the extension and retraction of the telescopic component 3 to adjust the position of the roller brush 4 so that the roller brush 4 can fit tightly against the joint of the PCPC pipe.

[0034] It should be noted that in actual use, since the outer wall of the PCCP pipe is arc-shaped, the movement trajectory of the roller brush 4 should be consistent with the shape of the PCCP pipe's outer wall. This process can be implemented using a PLC controller. Specifically, the characteristic equation of the arc shape of the outer wall is calculated based on the pipe diameter of the PCCP pipe. The movement trajectory of the roller brush 4 is decomposed into uniform vertical movement and variable horizontal movement. The uniform vertical movement is achieved by the PLC controller controlling the drive motor 203 to rotate at a uniform speed. When the vertical movement is uniform, the speed change trend of the variable horizontal movement can be calculated based on the shape of the arc surface. The PLC controller then controls the oil circuit servo of the second hydraulic telescopic rod 304, adjusting the speed by controlling the total amount of hydraulic oil entering and exiting the oil circuit per unit time. This ensures that the extension and retraction speed of the second hydraulic telescopic rod 304 coordinates with the uniform vertical movement controlled by the drive motor 203, jointly achieving the arc-shaped movement of the roller brush 4. PLC controllers have very wide applications in hydraulic control; therefore, their specific circuit connections will not be elaborated here.

[0035] As a preferred embodiment, it also includes a first hydraulic telescopic rod 206, one end of which is hinged to the lifting plate 101 and the other end is hinged to the fixed sleeve 301, and the fixed sleeve 301 is hinged to the lifting plate 101. The first hydraulic telescopic rod 206 is used to make the fixed sleeve 301 rotate around the hinge point between the fixed sleeve 301 and the lifting plate 101.

[0036] In this embodiment, when the first hydraulic telescopic rod 206 extends, the telescopic component 3 rotates downward around the hinge point with the lifting plate 101, and vice versa. This, combined with the up-and-down movement of the lifting plate 101 within the gantry 2, effectively increases the coverage area of ​​the roller brush 4. For example, when the diameter of the PCCP pipe is greater than the height of the gantry 2, by shortening the first hydraulic telescopic rod 206, the fixed sleeve plate 301 and the movable insert plate 303 tilt upwards together. Then, the second hydraulic telescopic rod 304 extends, causing the movable insert plate 303 to extend out from the fixed sleeve plate 301. This allows the roller brush 4 to extend and coat the portion of the PCCP pipe joint that exceeds the height of the gantry 2, thereby increasing the coating area. If there are still uncoated portions at the top of the PCCP pipe, these can be filled in manually.

[0037] In another embodiment, first hydraulic telescopic rods 206 are hinged to both the upper and lower sides of the telescopic assembly 3. The two first hydraulic telescopic rods 206 are symmetrically arranged about the fixed sleeve 301. When the first hydraulic telescopic rod 206 above the telescopic assembly 3 shortens and pulls the fixed sleeve 301 upwards, the first hydraulic telescopic rod 206 below the fixed sleeve 301 extends and pushes the fixed sleeve 301 upwards. This better adjusts the angle of the fixed sleeve 301 and prevents the fixed sleeve 301 and movable insert plate 303 from falling directly without restraint if one of the first hydraulic telescopic rods 206 fails, thus avoiding damage to the PCCP pipeline or creating additional safety hazards. The cooperation between the first hydraulic telescopic rods 206 above and below the fixed sleeve 301, and their cooperation with the second hydraulic telescopic rod 304, can also be implemented by a PLC controller.

[0038] As a preferred embodiment, such as Figure 4 and Figure 6 As shown, the telescopic component 3 is connected in sequence to a fixed plate 601 and a mounting frame 305 on the side away from the lifting plate 101, and the roller brush 4 is mounted on the mounting frame 305; the spraying component 5 includes a storage tank 501, a suction pump 502, a guide pipe 503, and a nozzle 504; the storage tank 501 is mounted on the base plate 1, and the suction pump 502 is connected to the storage tank 501; the nozzle 504 is mounted on the fixed plate 601 and faces the roller brush 4, and is connected to the suction pump 502 through the guide pipe 503, for spraying anti-corrosion coating onto the roller brush 4.

[0039] In this embodiment, a fixing plate 601 is fixedly connected to the side of the telescopic component 3 away from the lifting plate 101, and a mounting bracket 305 is fixedly connected to the side of the fixing plate 601 away from the lifting plate 101 as the mounting position for the roller brush 4 (to avoid obstructing the fixing plate 601). Figure 6 Only a portion of the mounting bracket 305 is shown, allowing the roller brush 4 to rotate on the mounting bracket 305. A storage tank 501 is provided on the base plate 1 to store anti-corrosion coating. The anti-corrosion coating stored in the storage tank 501 is extracted by a suction pump 502, and then pumped to the nozzle 504 on the guide pipe 503 through the guide pipe 503. The nozzle 504 sprays the anti-corrosion coating onto the roller brush 4. With the extension and retraction of the telescopic component 3, the roller brush 4 can apply the anti-corrosion coating to the joint of the PCCP pipe.

[0040] As a further embodiment, such as Figure 6 As shown, the fixed plate 601 is also provided with a flow guiding cavity 602, which is connected to the suction pump 502 through the material guide pipe 503; multiple nozzles 504 are provided, each nozzle 504 is connected to the flow guiding cavity 602 and faces the roller brush 4, and is used to spray anti-corrosion coating onto the roller brush 4.

[0041] In this embodiment, the fixed plate 601 has a flow guiding cavity 602 inside, which serves as a material distribution structure communicating with the material guide pipe 503. Several nozzles 504 facing the roller brush 4 are also evenly arranged on the fixed plate 601. When the anti-corrosion coating is drawn from the storage tank 501 by the suction pump 502, it is pumped along the material guide pipe 503 into the flow guiding cavity 602 of the fixed plate 601, and then evenly sprayed onto the roller brush 4 by the multiple nozzles 504, ensuring a uniform distribution of the anti-corrosion coating on the roller brush 4 and guaranteeing the overall uniformity of the anti-corrosion coating layer applied by the roller brush 4. Since the anti-corrosion coating needs to be sprayed through multiple nozzles 504 at once, the suction pump 502 should be a booster pump with sufficient pressure to avoid insufficient pressure in one or more nozzles 504, resulting in uneven spraying.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. An apparatus for applying anti-corrosion coating to the joints of PCCP pipes, characterized in that, include: Movable base plate (1), gantry frame (2), telescopic assembly (3), roller brush (4) and spraying assembly (5); The portal frame (2) is set on the base plate (1), and the portal frame (2) is provided with a lifting plate (101) that can move up and down. One end of the telescopic component (3) is connected to the lifting plate (101), and the other end is connected to the roller brush (4). The rotating shaft of the roller brush (4) is set horizontally. The telescopic component (3) is used to make the roller brush (4) fit tightly against the joint of the PCCP pipe. The spraying assembly (5) is used to spray anti-corrosion coating onto the roller brush (4).

2. The apparatus for applying anti-corrosion coating to the joints of PCCP pipes as described in claim 1, characterized in that, The portal frame (2) is provided with a horizontal plate (201) and a drive motor (203) is provided on the bottom plate (1). The output shaft of the drive motor (203) passes through the horizontal plate (201) and is connected to the vertically arranged threaded rod (202). The threaded rod (202) is rotatably arranged between the horizontal plate (201) and the top plate of the portal frame (2). The threaded rod (202) is also threadedly fitted with a lifting plate (101). The drive motor (203) is used to drive the threaded rod (202) to rotate, so as to drive the lifting plate (101) to move up and down.

3. The apparatus for applying anti-corrosion coating to the joints of PCCP pipes as described in claim 2, characterized in that, A guide rod (204) parallel to the threaded rod (202) is provided between the horizontal plate (201) and the top plate of the portal frame (2). The guide rod (204) passes through the lifting plate (101) and slides with the lifting plate (101).

4. The apparatus for applying anti-corrosion coating to the joints of PCCP pipes as described in claim 2, characterized in that, The two vertical plates of the portal frame (2) are provided with a limiting groove (205) on their facing surfaces, and the limiting groove (205) is arranged parallel to the threaded rod (202); the lifting plate (101) is provided with limiting blocks (102) on both sides that are embedded in the limiting groove (205) and slide.

5. The apparatus for applying anti-corrosion coating to the joints of PCCP pipes as described in claim 2, characterized in that, The telescopic assembly (3) includes a fixed sleeve plate (301), a movable insert plate (303), and a second hydraulic telescopic rod (304); one side of the fixed sleeve plate (301) is hinged to the lifting plate (101), and the opposite side is provided with a first sliding groove (302); the movable insert plate (303) is disposed in the first sliding groove (302) and can slide; one end of the second hydraulic telescopic rod (304) is connected to the fixed sleeve plate (301), and the other end is connected to the movable insert plate (303); the roller brush (4) is disposed on the side of the movable insert plate (303) away from the lifting plate (101).

6. The apparatus for applying anti-corrosion coating to the joints of PCCP pipes as described in claim 5, characterized in that, It also includes a first hydraulic telescopic rod (206), one end of which is hinged to the lifting plate (101) and the other end is hinged to the fixed sleeve plate (301), and the fixed sleeve plate (301) is hinged to the lifting plate (101); The first hydraulic telescopic rod (206) is used to make the fixed sleeve (301) rotate around the hinge point between the fixed sleeve (301) and the lifting plate (101).

7. The apparatus for applying anti-corrosion coating to the joints of PCCP pipes as described in claim 1, characterized in that, The telescopic component (3) is connected in sequence to a fixed plate (601) and a mounting frame (305) on the side away from the lifting plate (101), and the roller brush (4) is set on the mounting frame (305); the spraying component (5) includes a storage tank (501), a suction pump (502), a guide pipe (503) and a nozzle (504); the storage tank (501) is set on the base plate (1), and the suction pump (502) is connected to the storage tank (501); the nozzle (504) is set on the fixed plate (601) and faces the roller brush (4), and is connected to the suction pump (502) through the guide pipe (503) for spraying anti-corrosion coating onto the roller brush (4).

8. The apparatus for applying anti-corrosion coating to the joints of PCCP pipes as described in claim 7, characterized in that, The fixed plate (601) is also provided with a flow guide cavity (602), which is connected to the suction pump (502) through the material guide pipe (503); multiple nozzles (504) are provided, each nozzle (504) is connected to the flow guide cavity (602) and faces the roller brush (4) for spraying anti-corrosion coating onto the roller brush (4).

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