A pipeline interior spraying apparatus and a spraying method

Abstract

The application relates to the field of pipeline internal spraying technology, in particular to a pipeline internal spraying device and a spraying method, which comprise a base and an internal sprayer body, the upper end of the base is fixedly installed with a pneumatic motor, the output shaft of the pneumatic motor is fixedly connected with a shaft coupling, and one end of the shaft coupling is fixedly connected with a traction mechanism. The beneficial effect is that a connecting self-locking mechanism is arranged between the connecting block and the internal sprayer body, when the two are close, the position of the end head of the internal sprayer body can be automatically adjusted, the internal sprayer body can be accurately and automatically centered with the traction mechanism, the time and error of manual adjustment are reduced, the internal sprayer body can not only satisfy the variable-diameter adjustment of pipelines with different specifications and diameters, realize the adaptive adjustment of the pipelines, but also can absorb vibration and impact protection, the connecting components are not damaged, and the quality of pipeline internal spraying is improved; the internal sprayer body can also stand and store when idle, and the space utilization is improved.

Description

Technical Field

[0001] This invention relates to the field of pipeline internal spraying technology, specifically to a pipeline internal spraying equipment and spraying method. Background Technology

[0002] Pipelines are a crucial component of fluid transport systems. Whether it's a pipeline system transporting chemicals or a water supply pipeline, corrosion and leakage on the inner wall of flanged pipes can cause serious environmental and economic impacts, and may even pose significant safety hazards. Currently, there are no suitable internal sprayers for spraying coatings inside pipelines. However, due to differences in the viscosity of the coatings used, the metal and ceramic components contained in the coatings, the required coating thickness, and the differences in the working environment, the spraying speed needs to be adjusted in real time, which traditional internal sprayer equipment cannot meet.

[0003] In the prior art, such as the pipeline internal anti-corrosion film spraying equipment disclosed in CN216880003U, there is a winch, which serves as the basic driving force for the device. A sprayer is installed on one side of the winch, and the sprayer can spray anti-corrosion liquid. A coater is installed on the side of the sprayer, and a conveying groove is opened inside the coater. When the wire rope moves, it can drive the scraper to move. When the scraper moves, it can slide through the pipeline, which facilitates the sliding of the device inside the pipeline. After the anti-corrosion liquid enters the nozzle, it can be sprayed onto the inner wall of the pipeline through six sets of nozzles. When the anti-corrosion liquid is sprayed onto the inner wall of the pipeline, the scraper moves and can evenly spread the anti-corrosion liquid on the inner wall of the pipeline, which facilitates the spread of the anti-corrosion liquid. When the sealing gasket is squeezed, it can deform through its own rubber material. After the sealing gasket is deformed, it can seal the gap between the interface and the connecting groove, which facilitates the quick connection between the coater and the nozzle.

[0004] However, in actual use, due to differences in the viscosity of the coating, the presence of different metal and ceramic components in the coating, the required coating thickness, and the differences in the working environment, the spraying speed needs to be adjusted in real time, which traditional internal spraying equipment cannot meet.

[0005] Therefore, this invention proposes an internal pipe spraying device and method to solve the problem of the limited use of existing internal sprayers. It can adjust the travel speed of the internal sprayer in real time to ensure uniform coating thickness; the coating has good atomization effect and good durability; the spraying speed can be precisely adjusted at any time; and in case of abnormality, the pulling action can be released and the sprayer can be stopped and started immediately, which facilitates continuous operation and ensures the spraying effect. Summary of the Invention

[0006] The purpose of this invention is to provide a pipe internal spraying device and spraying method to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: In one aspect, a pipe internal spraying device includes a base and an internal sprayer body. A pneumatic motor is fixedly installed at the upper end of the base. A coupling is fixedly connected to the output shaft of the pneumatic motor. A traction mechanism is fixedly connected to one end of the coupling. The traction mechanism includes a sprocket assembly fixedly installed on the coupling. A pull chain is rotatably connected to the outer surface of the sprocket assembly. A connecting block is fixedly connected to one end of the pull chain via a hinge. A self-locking mechanism is provided between the internal sprayer body and the connecting block. The internal sprayer body consists of a rotating rod, a material cylinder, and a fixed disc. The coupling connects the output shaft of the pneumatic motor and the connecting shaft, and is used to integrate and adjust the air supply assembly together with the internal sprayer body and the traction mechanism.

[0008] Preferably, one end of the rotating rod is fixedly connected to the inner surface of the center of the fixed disk, a support foot is fixedly connected to the outer ring surface of the fixed disk, a fixed base is fixedly installed on the inner side of the support foot, the self-locking mechanism is arranged on the inner side of the fixed base, and the fixed base is in the form of an annular plate structure.

[0009] Preferably, a touch switch and a magnetic ring are fixedly installed on one side of the fixed disk. The touch switch is located on the central axis of the fixed disk and the magnetic ring. The outer surface of the touch switch is movably inserted into a limiting groove preset on the inner wall of one side of the connecting block, and the outer surface of the connecting block is movably embedded in the inner ring surface of the magnetic ring. The touch switch and the magnetic ring are electrically connected, and the specific model of the touch switch is a surface mount type TS-1102-1.

[0010] Preferably, the self-locking connection mechanism includes a drive wheel, an internal toothed ring, and an arc-shaped fixed block. The arc-shaped fixed block is fixedly installed on the inner side of the fixed base. The drive wheel is rotatably installed on the surface of the fixed base. The outer surface of the drive wheel meshes with the inner tooth surface of the internal toothed ring and rotates. The outer ring surface of the internal toothed ring is rotatably connected to the inner surface of the fixed base.

[0011] Preferably, the inner tooth surface of the internal gear ring meshes with a driven wheel, and a shaft is fixedly connected to the central inner surface of the driven wheel. The shaft is rotatably mounted on a fixed base, and a rocker arm is fixedly connected to the outer surface of the shaft. A clamping block is movably connected to the other end of the rocker arm, and the outer surface of the clamping block movably abuts against the outer surface of the connecting block.

[0012] Preferably, a sleeve is fixedly connected to the outer surface of the swing arm, and a retaining spring is hinged to one side surface of the sleeve, and the other end of the retaining spring is fixedly connected to the inner surface of the arc-shaped block.

[0013] Preferably, the end of the rotating rod away from the fixed plate is fixedly connected to a threaded part, the outer surface of the threaded part is threadedly connected to a threaded block, the outer surface of the rotating rod is movably connected to a gripping ring, a force-bearing rotating rod is fixedly connected to the gripping ring, and the other end of the force-bearing rotating rod is fixedly connected to one side surface of the threaded block.

[0014] Preferably, a limiting ring is rotatably connected to the outer surface of the threaded block, a hinge block one is fixedly installed on the outer surface of the limiting ring, a movable arm one is hinged to the outer surface of the hinge block one, a movable arm two is pivotally connected to the outer surface of the movable arm one via a pivot, a hinge block two is hinged to one end of the movable arm two, the hinge block two is fixedly installed on the outer surface of the material cylinder, and a traveling wheel is rotatably connected to the ends of the movable arm one and the movable arm two away from the threaded part, respectively.

[0015] Preferably, the material cylinder has a cylindrical hollow structure. One end of the material cylinder is fixedly connected to the outer surface of the threaded part. The other end of the material cylinder is connected to a bell-shaped spray cup. A rotary joint is provided between the bell-shaped spray cup and the material cylinder. A suction pump is installed inside the bell-shaped spray cup. The input end of the suction pump extends into the inside of the material cylinder. A feed pipe is sealed on the inner wall of the material cylinder for connecting an external injection hose. A solenoid valve is provided on the inner side wall of the feed pipe.

[0016] On the other hand, a spraying method for an internal pipe spraying device includes the following steps:

[0017] Step 1: Equipment assembly and preparation, including assembling the components in a specific way and preparing the spraying material;

[0018] Step 2: Equipment debugging and positioning. Debug the equipment to ensure its normal operation, and then position the equipment inside the pipe to be sprayed or in a suitable location.

[0019] Step 3: Start the spraying and self-locking connection, start the spraying device, and spray the material evenly inside the pipe. At the same time, use the self-locking mechanism to ensure a stable connection between the spraying device and the inside of the pipe.

[0020] Step 4: Complete the spraying and equipment recovery. Once the desired spraying effect is achieved inside the pipeline, stop the spraying device, disconnect the self-locking mechanism, and recover the equipment.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] This invention proposes an internal pipe spraying device and method. By setting a self-locking mechanism between the connecting block and the internal sprayer body, the position of the end connection of the internal sprayer body can be automatically adjusted when the two are close, so that it is precisely and automatically aligned with the traction mechanism, reducing the time and error of manual adjustment. The internal sprayer body can not only meet the diameter adjustment of pipes of different specifications, realizing the adaptability of the pipe; but also absorb vibration and impact protection, preventing damage to the connecting parts while improving the quality of internal pipe spraying; it also allows the internal sprayer body to stand upright for storage when idle, improving space utilization; the travel speed of the internal sprayer body can be adjusted in real time to ensure uniform coating thickness; the spraying speed can be precisely adjusted at any time; and in case of abnormality, the pulling action can be released immediately, facilitating continuous operation and ensuring the spraying effect. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 1 ;

[0024] Figure 2 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 2 ;

[0025] Figure 3 This is a schematic diagram of a partial separation structure between the inner nozzle body and the connecting block of the present invention;

[0026] Figure 4 For the present invention Figure 3 A magnified structural diagram at point A;

[0027] Figure 5 For the present invention Figure 3 A magnified structural diagram at point B;

[0028] Figure 6 This is a schematic diagram of the cross-sectional structure connecting the material cylinder and the bell-shaped spray cup of the present invention;

[0029] Figure 7 This is a schematic diagram of the overall vertical structure of the internal nozzle body of the present invention;

[0030] Figure 8 This is a schematic diagram showing the disassembled structure of the fixing disk and fixing base of the present invention;

[0031] Figure 9 For the present invention Figure 8 A magnified structural diagram at point C;

[0032] Figure 10 This is a flowchart of the present invention.

[0033] In the diagram: 1. Base; 2. Pneumatic motor; 3. Sprocket assembly; 31. Pull chain; 32. Connecting block; 321. Touch switch; 4. Inner sprayer body; 41. Rotating rod; 411. Threaded part; 412. Grip ring; 413. Force-bearing rotating rod; 414. Threaded block; 42. Material cylinder; 421. Bell-shaped spray cup; 422. Suction pump; 43. Limiting ring; 431. Hinge block one; 432. 433. Movable arm 1; 434. Hinge block 2; 435. Movable arm 2; 44. Traveling wheel; 45. Fixed plate; 46. Support leg; 47. Magnetic ring; 48. Fixed base; 49. Driving wheel; 40. Internal gear ring; 41. Arc-shaped fixed block; 42. Driven wheel; 43. Shaft; 44. Swing rod; 45. Sleeve rod; 45. Abutment spring; 45. Clamping block. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the present invention clear and complete, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some, not all, embodiments of the present invention, and are merely illustrative of the embodiments of the present invention. They are not intended to limit the embodiments of the present invention. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] Example 1, please refer to Figure 1 - Figure 10 The present invention provides a technical solution: an internal spraying device for pipelines, including a base 1 and an internal sprayer body 4. A pneumatic motor 2 is fixedly installed on the upper end of the base 1. A coupling is fixedly connected to the output shaft of the pneumatic motor 2. A traction mechanism is fixedly connected to one end of the coupling. The traction mechanism includes a sprocket assembly 3 fixedly installed on the coupling. A pull chain 31 is rotatably connected to the outer surface of the sprocket assembly 3. A connecting block 32 is fixedly connected to one end of the pull chain 31 through a hinge. A self-locking connection mechanism is provided between the internal sprayer body 4 and the connecting block 32. The internal sprayer body 4 consists of a rotating rod 41, a material cylinder 42, and a fixed plate 44.

[0036] In Example 2, based on Example 1, to achieve a preliminary limiting connection between the connecting block 32 and the fixed base 45: one end of the rotating rod 41 is fixedly connected to the inner surface of the center of the fixed disk 44, a support foot 441 is fixedly connected to the outer ring surface of the fixed disk 44, and a fixed base 45 is fixedly installed on the inner side of the support foot 441. A self-locking mechanism is set on the inner side of the fixed base 45, and the fixed base 45 is in the form of an annular plate structure. A touch switch 321 and a magnetic ring 442 are fixedly installed on one side of the fixed disk 44. The touch switch 321 is set on the central axis of the fixed disk 44 and the magnetic ring 442. The outer surface of the touch switch 321 is movably inserted into the limiting groove preset on the inner wall of one side of the connecting block 32, and the outer surface of the connecting block 32 is movably embedded in the inner ring surface of the magnetic ring 442.

[0037] Reference Figure 3 and Figure 5 As shown, when the entire inner sprayer body 4 is fed into one end of the pipe to be sprayed, and the pull chain 31 enters the pipe, when the connecting block 32 and the fixed plate 44 approach each other, the magnetic ring 442 is activated. Under the influence of magnetic attraction, the connecting block 32 approaches the fixed plate 44 and enters the inner ring surface of the magnetic ring 442. It is also fitted into the preset limit groove on the inner wall of the connecting block 32 through the touch switch 321, thus achieving rapid centering and limiting of the two, reducing the time and error of manual adjustment by the staff. The inner sprayer body 4 and the traction mechanism jointly integrate an air supply adjustment component, which can accurately adjust the pulling speed of the pull chain 31, ensuring that the pulling action can be quickly released in case of abnormality, thereby ensuring the quality of the inner spraying.

[0038] In Example 3, based on Example 2, to achieve multiple clamping and locking between the restricted internal sprayer body 4 and the pull chain 31: the connecting self-locking mechanism includes a driving wheel 451, an internal toothed ring 452, and an arc-shaped fixed block 453. The arc-shaped fixed block 453 is fixedly installed on the inner side of the fixed base 45. The driving wheel 451 is rotatably installed on the surface of the fixed base 45. The outer surface of the driving wheel 451 meshes with the inner tooth surface of the internal toothed ring 452 and rotates. The outer ring surface of the internal toothed ring 452 is rotatably connected to the inner surface of the fixed base 45. The inner tooth surface of the internal toothed ring 452 meshes with and rotates with a driven... A rotating wheel 454 has a shaft 4541 fixedly connected to its inner center surface. The shaft 4541 is rotatably mounted on a fixed base 45. A rocker arm 455 is fixedly connected to the outer surface of the shaft 4541. A clamping block 456 is movably connected to the other end of the rocker arm 455. The outer surface of the clamping block 456 movably abuts against the outer surface of the connecting block 32. A sleeve rod 4551 is fixedly connected to the outer surface of the rocker arm 455. A contact spring 4552 is hinged to one side surface of the sleeve rod 4551. The other end of the contact spring 4552 is fixedly connected to the inner surface of the arc-shaped fixed block 453.

[0039] Reference Figure 5 , Figure 8 and Figure 9 As shown, when the connecting block 32 is fully inserted into the inner ring of the magnetic ring 442 under magnetic attraction, the touch switch 321 is fully inserted into the limit slot. At this time, the connecting block 32 touches the touch switch 321, thus triggering the self-locking mechanism. At this time, the driving wheel 451 opens, and under the driving rotation, the internal gear ring 452 rotates. At the same time, the other multiple sets of driven wheels 454 rotate synchronously, and through the shaft 4541, they drive the swing arm 455 to swing. According to the outer diameter of the connecting block 32, the multiple sets of clamping blocks 456... The distance between them can be adjusted for applicability, thereby enabling quick and convenient connection between the inner sprayer body 4 and the connecting block 32. When it is necessary to disassemble the two, it is only necessary to disconnect the power to the magnetic ring 442 and the active rotating wheel 451. When the swing rod 455 swings, the sleeve rod 4551 moves with the swing rod 455. At the same time, the abutment spring 4552 undergoes elastic deformation due to the movement of the sleeve rod 4551, thereby further weakening and absorbing the vibration and impact of the spraying equipment during the spraying operation, and improving the quality and uniformity of the spraying inside the pipeline.

[0040] It should be noted that when the inner nozzle body 4 is idle, the traction mechanism is detached from the inner nozzle body 4, and the fixed base 45 can serve as an upright base. With one end of the bell-shaped spray cup 421 facing upwards, the fixed base 45 is placed on a flat surface. By expanding the diameter of multiple sets of swing rods 455 outwards, the internal components are stored in the inner ring surface of the fixed base 45. This satisfies the need to store the self-locking mechanism while facilitating the storage of the inner nozzle body 4, thus greatly improving space utilization.

[0041] Example 4, based on Example 3, in order to achieve the adaptive function of the inner nozzle body 4 to pipes of different diameters: A threaded portion 411 is fixedly connected to one end of the rotating rod 41 away from the fixed plate 44; a threaded block 414 is threadedly connected to the outer surface of the threaded portion 411; a gripping ring 412 is movably connected to the outer surface of the rotating rod 41; a force-bearing rotating rod 413 is fixedly connected to the gripping ring 412; the other end of the force-bearing rotating rod 413 is fixedly connected to one side surface of the threaded block 414; a limit ring 43 is rotatably connected to the outer surface of the threaded block 414; a hinge block 431 is fixedly installed on the outer surface of the limit ring 43; a movable arm 432 is hinged to the outer surface of the hinge block 431; and the movable arm 432... The outer surface of the cylinder 42 is pivotally connected to a movable arm 434. One end of the movable arm 434 is hinged to a hinge block 433. The hinge block 433 is fixedly installed on the outer surface of the cylinder 42. The ends of the movable arm 432 and the movable arm 434 away from the threaded part 411 are respectively rotatably connected to a traveling wheel 435. The cylinder 42 has a cylindrical hollow structure. One end of the outer surface of the cylinder 42 is fixedly connected to the outer surface of the threaded part 411. The other end of the cylinder 42 is connected to a bell-shaped spray cup 421. A rotary joint is provided between the bell-shaped spray cup 421 and the cylinder 42. A suction pump 422 is installed inside the bell-shaped spray cup 421. The input end of the suction pump 422 extends into the inside of the cylinder 42.

[0042] To accommodate pipes of different diameters, the distance between multiple sets of traveling wheels 435 is adjusted before the inner sprayer body 4 enters the pipe. Specifically, the hand grips the gripping ring 412 and the force-bearing rotating rod 413, applying force to the hand and causing one end of the threaded block 414 to rotate. At this time, the threaded block 414 is adapted to the surface thread of the threaded part 411, and the limiting ring 43 moves on the outer surface of the threaded block 414, providing a limit for the horizontal movement of the threaded block 414. When the threaded block 414 is moved and gradually moves to one side of the material cylinder 42, the movable arm 43... The distance between 2 and the movable arm 434 is shortened and the included angle is reduced, thus enabling rapid diameter adjustment of the traveling wheel 435 to meet the needs of different pipelines; paint is injected into the material cylinder 42 through the feed pipe, and when the suction pump 422 is turned on, the paint is sucked up, and the bell-shaped spray cup 421 can atomize the coating at high speed. The specially designed spray cup is durable and not easily damaged; it should be noted that the feed pipe is made of stainless steel capillary pipe, and there is more than one set. Different inner diameter stainless steel capillary pipes can be selected for guiding the material according to different viscosities.

[0043] Example 5: A spraying method for an internal pipe spraying device, comprising the following steps:

[0044] Step 1: Equipment assembly and preparation, including assembling the components in a specific way and preparing the spraying material;

[0045] Step 2: Equipment debugging and positioning. Debug the equipment to ensure its normal operation, and then position the equipment inside the pipe to be sprayed or in a suitable location.

[0046] Step 3: Start the spraying and self-locking connection, start the spraying device, and spray the material evenly inside the pipe. At the same time, use the self-locking mechanism to ensure a stable connection between the spraying device and the inside of the pipe.

[0047] Step 4: Complete the spraying and equipment recovery. Once the desired spraying effect is achieved inside the pipeline, stop the spraying device, disconnect the self-locking mechanism, and recover the equipment.

[0048] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pipe internal spraying device, comprising a base (1) and an internal sprayer body (4), characterized in that: A pneumatic motor (2) is fixedly installed on the upper end of the base (1). A coupling is fixedly connected to the output shaft of the pneumatic motor (2). A traction mechanism is fixedly connected to one end of the coupling. The traction mechanism includes a sprocket assembly (3) fixedly installed on the coupling. A pull chain (31) is rotatably connected to the outer surface of the sprocket assembly (3). A connecting block (32) is fixedly connected to one end of the pull chain (31) through a hinge. A self-locking connection mechanism is provided between the inner nozzle body (4) and the connecting block (32). The inner nozzle body (4) consists of a rotating rod (41), a material cylinder (42), and a fixed plate (44). One end of the rotating rod (41) is fixedly connected to the inner surface of the center of the fixed disk (44). The outer ring surface of the fixed disk (44) is fixedly connected to the support foot (441). The inner side of the support foot (441) is fixedly installed with a fixed base (45). The self-locking mechanism is set inside the fixed base (45). The fixed base (45) is an overall ring plate structure. A touch switch (321) and a magnetic ring (442) are fixedly installed on one side of the fixed disk (44). The touch switch (321) is located on the central axis of the fixed disk (44) and the magnetic ring (442). The outer surface of the touch switch (321) is movably inserted into the limiting groove preset on the inner wall of the connecting block (32), and the outer surface of the connecting block (32) is movably embedded in the inner ring surface of the magnetic ring (442). The self-locking connection mechanism includes a driving wheel (451), an internal gear ring (452), and an arc-shaped fixed block (453). The arc-shaped fixed block (453) is fixedly installed on the inner side of the fixed base (45). The driving wheel (451) is rotatably installed on the surface of the fixed base (45). The outer surface of the driving wheel (451) meshes with the inner tooth surface of the internal gear ring (452) and rotates. The outer ring surface of the internal gear ring (452) is rotatably connected to the inner surface of the fixed base (45). The inner tooth surface of the internal gear ring (452) meshes with a driven wheel (454) and rotates. The inner surface of the driven wheel (454) is located at the center of the inner tooth surface. A shaft (4541) is fixedly connected and rotatably mounted on a fixed base (45). A swing arm (455) is fixedly connected to the outer surface of the shaft (4541). A clamping block (456) is movably connected to the other end of the swing arm (455). The outer surface of the clamping block (456) movably abuts against the outer surface of the connecting block (32). When the connecting block (32) is fully inserted into the inner ring of the magnetic ring (442) by magnetic attraction, the touch switch (321) is fully inserted into the limit groove. At this time, the connecting block (32) touches the touch switch (321), thus triggering the self-locking mechanism.

2. The pipe internal spraying equipment according to claim 1, characterized in that: A sleeve rod (4551) is fixedly connected to the outer surface of the swing rod (455). A retaining spring (4552) is hinged to one side surface of the sleeve rod (4551). The other end of the retaining spring (4552) is fixedly connected to the inner surface of the arc-shaped block (453).

3. The pipe internal spraying equipment according to claim 1, characterized in that: The end of the rotating rod (41) away from the fixed plate (44) is fixedly connected to a threaded part (411), and a threaded block (414) is threadedly connected to the outer surface of the threaded part (411). A gripping ring (412) is movably connected to the outer surface of the rotating rod (41), and a force-bearing rotating rod (413) is fixedly connected to the gripping ring (412). The other end of the force-bearing rotating rod (413) is fixedly connected to one side surface of the threaded block (414).

4. The pipe internal spraying equipment according to claim 3, characterized in that: The outer surface of the threaded block (414) is rotatably connected to a limiting ring (43). A hinge block (431) is fixedly installed on the outer surface of the limiting ring (43). A movable arm (432) is hinged to the outer surface of the hinge block (431). A movable arm (434) is pivotally connected to the outer surface of the movable arm (432) via a pivot. A hinge block (433) is hinged to one end of the movable arm (434). The hinge block (433) is fixedly installed on the outer surface of the material cylinder (42). A traveling wheel (435) is rotatably connected to the ends of the movable arm (432) and the movable arm (434) away from the threaded part (411).

5. The pipe internal spraying equipment according to claim 4, characterized in that: The material cylinder (42) has a columnar hollow structure. One end of the material cylinder (42) is fixedly connected to the outer surface of the threaded part (411). The other end of the material cylinder (42) is connected to a bell-shaped spray cup (421). A rotary joint is provided between the bell-shaped spray cup (421) and the material cylinder (42). A suction pump (422) is installed inside the bell-shaped spray cup (421). The input end of the suction pump (422) extends into the inside of the material cylinder (42).

6. A spraying method for an internal pipe spraying device, implemented based on the internal pipe spraying device according to any one of claims 1-5, characterized in that: The spraying method of the internal spraying equipment for the pipeline includes the following steps: Step 1: Equipment assembly and preparation, including assembling the components in a specific way and preparing the spraying material; Step 2: Equipment debugging and positioning. Debug the equipment to ensure its normal operation, and then position the equipment inside the pipe to be sprayed or in a suitable location. Step 3: Start the spraying and self-locking connection, start the spraying device, and spray the material evenly inside the pipe. At the same time, use the self-locking mechanism to ensure a stable connection between the spraying device and the inside of the pipe. Step 4: Complete the spraying and equipment recovery. Once the desired spraying effect is achieved inside the pipeline, stop the spraying device, disconnect the self-locking mechanism, and recover the equipment.

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