Automatic detection system for pipe inner wall cleanliness

Abstract

The utility model provides an automated detection system for the cleanliness of the inner wall of a pipe, comprising: a pipe rack, a sponge bullet launching device, a pellet container, a liquid container, a first driving member and a collection chamber. The pipe rack comprises a frame body and a plurality of mounting frames arranged on the frame body at intervals. The sponge bullet launching device comprises a first cylinder body, a second cylinder body and an air pressure supply assembly, wherein the first end of the second cylinder body is connected to the first cylinder body, and the second end of the second cylinder body is connected to the air pressure supply assembly. The pellet container is arranged above the second cylinder body, and the pellet container is connected to the second cylinder body through a first pipe. The liquid container is connected to the second cylinder body through a second pipe. The first driving member is transmission-connected to the first cylinder body. The collection chamber is arranged on the side of the pipe rack away from the sponge bullet launching device. The utility model can automatically detect the pipeline through the above structure, and can detect multiple pipelines after one assembly, thereby simplifying the detection operation and improving the detection efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of industrial gases, in particular to an automatic detection system for the cleanliness of the inner wall of a pipe. Background Art

[0002] Clean gas is a commonly used medium in the industrial field, and it is also an essential medium for testing in the aerospace field. As an important part of the gas supply system, the cleanliness of the gas pipeline is a key link in ensuring the cleanliness of the gas. The cleanliness of the gas pipeline is guaranteed by, first, the cleaning and cleanliness test of the pipes before the installation of the pipelines, and second, the correct use and maintenance of the pipelines after the pipelines are put into use. The former is an important basis for ensuring the quality of the gas. Since pipes are generally produced in industrial batches, it is difficult to ensure that every pipeline that transports clean gas meets the cleanliness requirements. Therefore, 100% cleanliness test of the pipeline must be carried out before the installation of the pipeline.

[0003] The commonly used inspection method before pipes leave the factory is to use a sponge bullet dipped in alcohol (or other liquid cleaning agents), which is pushed by compressed gas to pass through the inner wall of the inspected pipe, and then the cleanliness of the inner wall of the pipe can be judged by checking the cleanliness of the sponge bullet. The above methods are commonly used methods in the existing inspection process, but they are currently all fully manual operations, the operation process is cumbersome, and can only be performed one by one, which is inefficient. A gas supply system often involves tens of thousands of meters or more of pipes, and the length of each pipe product is generally 6m. According to the current traditional manual inspection method, the low efficiency makes it difficult to meet the gas supply system's needs for construction efficiency and rapid recovery after damage. Utility Model Content

[0004] Therefore, the technical problem to be solved by the utility model is to overcome the defects of the prior art of the pipe inner wall detection technology, which has a cumbersome operation process and low efficiency, thereby providing a highly efficient automatic detection system for the cleanliness of the pipe inner wall.

[0005] In order to solve the above problems, the utility model provides an automatic detection system for the cleanliness of the inner wall of a pipe, comprising:

[0006] A pipe rack, comprising a frame body and a plurality of mounting frames arranged on the frame body at intervals;

[0007] A sponge bullet launching device is arranged on one side of the pipe rack, comprising a first cylinder, a second cylinder and an air pressure supply assembly, wherein the first end of the second cylinder is connected to the first cylinder, the second end of the second cylinder is connected to the air pressure supply assembly, and the air pressure supply assembly is suitable for optionally providing compressed air to the second cylinder;

[0008] A pellet container is arranged above the second cylinder, the pellet container is connected with the second cylinder through a first pipe, and a first switch valve is arranged on the first pipe;

[0009] The liquid container is connected to the second cylinder through a second pipeline, and the second pipeline is provided with a second switch valve;

[0010] A first driving member is drivingly connected to the first cylinder and is suitable for driving the first cylinder to move toward or away from the mounting frame;

[0011] The collecting cavity is arranged on a side of the pipe rack away from the sponge bullet launching device and has an opening facing the plurality of mounting racks.

[0012] Optionally, the air pressure supply assembly includes an air compressor and an air source buffer tank, the air compressor is connected to the air source buffer tank through a first gas pipeline, the air source buffer tank and the second cylinder are connected through a second gas pipeline, and a first regulating valve is provided on the second gas pipeline.

[0013] Optionally, the gas source buffer tank is connected to the top of the liquid container through a third gas pipeline, and a second regulating valve is provided on the third gas pipeline.

[0014] Optionally, the second cylinder has a downwardly curved arc-shaped cylinder section, the first pipeline is connected to the arc-shaped cylinder section, and the second pipeline is connected to the arc-shaped cylinder section.

[0015] Optionally, one end of the first cylinder facing the mounting frame has a nozzle, and the inner diameter of the nozzle gradually decreases from the first cylinder toward the mounting frame.

[0016] Optionally, a hose is provided between the first cylinder and the second cylinder, and the first cylinder, the second cylinder and the hose have the same inner diameter.

[0017] Optionally, the pipe rack is cylindrical in shape, and a plurality of mounting brackets are arranged on the inner wall of the pipe rack, and the pipe rack is rotatably arranged; the second driving member is transmission-connected to the pipe rack, suitable for driving the pipe rack to rotate, and the central axis of the first cylinder intersects with the rotation paths of the plurality of mounting seats.

[0018] Optionally, an angular displacement sensor is further included to detect the rotation angle of the pipe rack.

[0019] Optionally, the pellet container has a top opening and a container cover detachably mounted on the top opening; the bottom of the pellet container has an opening connected to the first pipe, the height of the opening is lower than the height of the bottom edge of the pellet container, and the bottom end face of the pellet container extends obliquely downward from the edge of the bottom of the pellet container to the opening.

[0020] Optionally, a first detection element is provided on the side wall of the pellet container, and the first detection element is suitable for being triggered when the pellets in the pellet container are less than a predetermined number.

[0021] Optionally, the bottom of the collecting cavity has a bullet hole, and the bottom of the bullet hole has a movably arranged storage structure.

[0022] The utility model has the following advantages:

[0023] The utility model provides an automatic detection system for the cleanliness of the inner wall of a pipe, comprising: a pipe rack, a sponge bullet launcher, a pellet container, a liquid container, a first driving member and a collecting chamber. The pipe rack comprises a frame body and a plurality of mounting brackets arranged on the frame body at intervals. The sponge bullet launcher is arranged on one side of the pipe rack, comprising a first cylinder body, a second cylinder body and a gas pressure supply assembly, wherein the first end of the second cylinder body is connected to the first cylinder body, and the second end of the second cylinder body is connected to the gas pressure supply assembly, and the gas pressure supply assembly is suitable for optionally providing compressed air to the second cylinder body. The pellet container is arranged above the second cylinder body, and the pellet container is connected to the second cylinder body through a first pipeline, and a first switch valve is arranged on the first pipeline. The liquid container is connected to the second cylinder body through a second pipeline, and a second switch valve is arranged on the second pipeline. The first driving member is connected to the first cylinder body in a transmission manner, and is suitable for driving the first cylinder body to move in a direction close to or away from the mounting bracket. The collecting chamber is arranged on the side of the pipe rack away from the sponge bullet launcher, and has an opening facing the plurality of mounting brackets.

[0024] The projectile container can be used to accommodate the detection projectile, for example, the detection projectile can be a sponge projectile. The pipes or pipelines can be installed on multiple mounting frames respectively, and after installation, the central axis of the pipes or pipelines faces the first cylinder. During operation, the first switch valve is opened, and the detection projectile enters the second cylinder from the projectile container through the first pipeline under the action of its own gravity. The first switch valve is closed, and the second switch valve is opened, and the liquid enters the second cylinder from the liquid container through the second pipeline. After a proper amount of liquid is introduced, the second switch valve is closed. The outer surface of the detection projectile located in the second cylinder is soaked with liquid. During this process, the first driving member can drive the opening of the first cylinder to align with the pipe mouth of the pipe or pipeline. Then the air pressure supply component introduces compressed air into the second cylinder. The detection projectile passes through the second cylinder and the first cylinder in turn under the push of the compressed air and enters the pipe or pipeline. In the process of the detection projectile passing through the pipe or pipeline, the outer surface of the detection projectile contacts and rubs with the inner wall of the pipe or pipeline, and then enters the collection cavity, thereby completing the detection of one of the pipes or pipelines. After that, the pipes or pipelines on other mounting racks can be detected in turn according to the above process, and the cleanliness of the inner wall of the pipe can be judged by observing the cleanliness of the outer surface of the detection projectile.

[0025] The utility model can perform automatic detection through the structure and can detect multiple pipes or pipelines after one assembly, thereby simplifying the detection operation and improving the detection efficiency.

[0026] The automated detection system for the cleanliness of the inner wall of a pipe provided by the utility model can effectively improve the detection efficiency of pipes or pipelines, thereby improving the production efficiency of pipes or pipelines to meet the ever-increasing supply demand of pipes or pipelines. On the one hand, it can effectively improve the construction efficiency of the gas supply system; on the other hand, when the gas supply system is damaged due to various reasons, the system can effectively improve the rapid recovery capability of the gas supply system. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 The schematic diagram of the structure of the automatic detection system for the cleanliness of the inner wall of the pipe in this embodiment is shown;

[0029] Figure 2 Shows Figure 1 A partial enlarged view of point A in the middle.

[0030] Description of reference numerals:

[0031] 11. frame; 111. second drive member; 112. angular displacement sensor; 12. mounting frame; 13. collecting chamber; 14. bullet hole; 21. first cylinder; 211. first drive member; 212. nozzle; 22. second cylinder; 222. arc cylinder section; 23. hose; 3. projectile container; 31. first pipeline; 32. first switch valve; 33. detection projectile; 34. container cover; 35. opening; 36. first detection element; 4. liquid container; 41. second pipeline; 42. second switch valve; 43. flow meter; 51. air compressor; 52. gas source buffer tank; 53. first gas pipeline; 54. second gas pipeline; 541. first regulating valve; 55. third gas pipeline; 551. second regulating valve; 6. control unit. DETAILED DESCRIPTION

[0032] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0033] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0036] like Figure 1 As shown, in this embodiment, an automated detection system for the cleanliness of the inner wall of a pipe is provided, including: a pipe rack, a sponge bullet launching device, a projectile container 3, a liquid container 4, a first driving member 211 and a collection chamber 13.

[0037] The pipe rack includes a frame body 11 and a plurality of mounting frames 12 arranged at intervals on the frame body 11. The pipe rack is cylindrical in shape, and a plurality of mounting frames 12 are arranged on the inner wall of the pipe rack. The pipe rack is rotatably arranged, and a second driving member 111 may be arranged near the pipe rack. The second driving member 111 is connected to the pipe rack by transmission. For example, the pipe rack may be mounted on the supporting bracket by a rotating shaft and a bearing. The second driving member 111 may be a driving motor. The second driving member 111 may be connected to the pipe rack by a transmission structure and drive the pipe rack to rotate. The transmission structure may be a gear box or other transmission structure capable of driving the pipe rack to rotate. It may be specifically arranged according to actual conditions, and will not be listed one by one here.

[0038] The sponge bullet launching device is arranged on one side of the pipe rack, and includes a first cylinder 21, a second cylinder 22 and an air pressure supply assembly. The first end of the second cylinder 22 is connected to the first cylinder 21, and the second end of the second cylinder 22 is connected to the air pressure supply assembly. The first end of the second cylinder refers to the end close to the pipe rack, and the second end is the end opposite to the first end. The air pressure supply assembly is suitable for optionally providing compressed air to the second cylinder 22. The inner diameters of the first cylinder 21 and the second cylinder 22 are the same. After the compressed air is provided to the second cylinder 22, the detection bullet located in the second cylinder can pass through the second cylinder 22 and the first cylinder 21 in sequence under the push of air pressure.

[0039] The pellet container 3 is arranged above the second cylinder 22, and the pellet container 3 is connected to the second cylinder 22 through a first pipe 31. A first switch valve 32 is arranged on the first pipe 31. When the first switch valve 32 is opened, the detection bullet 33 located in the pellet container 3 can enter the second cylinder 22 from the first pipe 31 under the action of its own gravity, and then the first switch valve 32 can be closed.

[0040] The liquid container 4 is connected to the second cylinder 22 through the second pipe 41. The second pipe 41 is provided with a second switch valve 42. The second switch valve 42 can be opened to allow the liquid to enter the second cylinder from the liquid container 4 through the second pipe 41. When the liquid flow rate reaches the preset requirement, the second switch valve 42 is closed. The liquid flow rate can be determined according to the actual situation, as long as it can meet the detection requirements. No specific description is given here. The liquid container 4 can contain alcohol or other liquid detergents.

[0041] The first drive member 211 is connected to the first cylinder 21 by transmission, and is suitable for driving the first cylinder 21 to move in a direction close to or away from the mounting frame 12. For example, the first drive member 211 can be connected to the first cylinder 21 by transmission through a screw nut mechanism, so that the first cylinder 21 can make a linear motion under the drive of the first drive member 211, thereby facilitating the opening of the first cylinder 21 to dock with the pipe or pipe mouth of the pipe located on the mounting frame 12. A hose 23 can be arranged between the first cylinder 21 and the second cylinder 22, and the inner diameters of the first cylinder 21, the second cylinder 22 and the hose 23 are the same. Since the second cylinder 22 needs to be connected to the first pipe 31 and the second pipe 41, the position of the second cylinder 22 is relatively fixed, which is conducive to the smooth pressing of the detection bomb 33 and the introduction of liquid. The arrangement of the hose 23 can facilitate the first cylinder 21 to maintain a conductive relationship with the second cylinder 22 through the hose 23 after moving in the direction of the mounting frame 12, avoiding the occurrence of a gap between the first cylinder 21 and the second cylinder 22, and avoiding the loss of pressure gas.

[0042] The collecting chamber 13 is arranged on the side of the pipe rack away from the sponge bullet launching device, and has an opening facing multiple mounting frames 12. After the detection bullet body 33 passes through the pipe or pipeline, it will be blocked by the inner wall of the collecting chamber 13, thereby collecting the detection bullet body 33 to facilitate subsequent observation of the cleanliness of the outer surface of the detection bullet body 33, and then facilitate judgment of the cleanliness of the inner wall of the pipe or pipeline.

[0043] For example, the detection bullet 33 may be a sponge bullet. The pipes or pipelines may be mounted on the plurality of mounting frames 12 , respectively. After being mounted in place, the central axis of the pipes or pipelines faces the first cylinder 21 and coincides with the central axis of the first cylinder 21 .

[0044] During operation, the first switch valve 32 is opened, and the detection bullet 33 enters the second cylinder 22 from the projectile container 3 through the first pipe 31 under the action of its own gravity. The first pipe 31 can also be preloaded with a certain number of detection bullets 33. After the first switch valve 32 is opened, the detection bullet 33 can directly enter the second cylinder 22. After the bullet is compressed, the first switch valve 32 is closed.

[0045] The second switch valve 42 is opened, and the liquid enters the second cylinder 22 from the liquid container 4 through the second pipe 41. After a proper amount of liquid is introduced, the second switch valve 42 is closed. The outer surface of the detection bomb 33 in the second cylinder 22 is soaked with liquid. When the detection bomb 33 is a sponge bomb, the sponge bomb can absorb the liquid, so that the sponge bomb becomes swollen and the surface is moistened, which is more conducive to contact and friction with the inner wall of the pipe or pipeline. During this process, the first driving member 211 can drive the opening of the first cylinder 21 to align with the pipe mouth of the pipe or pipeline or extend into the pipe mouth, and then the air pressure supply component introduces compressed air into the second cylinder 22. Under the push of the compressed air, the detection bomb 33 passes through the second cylinder 22 and the first cylinder 21 in turn and enters the pipe or pipeline. In the process of the detection bomb 33 passing through the pipe or pipeline, the outer surface of the detection bomb 33 contacts and rubs with the inner wall of the pipe or pipeline, and then enters the collection chamber 13, thereby completing the detection of one of the pipes or pipelines. After that, the pipes or pipelines on other mounting racks can be inspected in turn according to the above process, and the cleanliness of the inner wall of the pipe or pipeline can be judged by observing the cleanliness of the outer surface of the detection bomb.

[0046] The utility model can perform automatic detection through the structure and can detect multiple pipes or pipelines after one assembly, thereby simplifying the detection operation and improving the detection efficiency.

[0047] The automated detection system for the cleanliness of the inner wall of a pipe provided by the utility model can effectively improve the detection efficiency of pipes or pipelines, thereby improving the production efficiency of pipes or pipelines to meet the ever-increasing supply demand of pipes or pipelines. On the one hand, it can effectively improve the construction efficiency of the gas supply system; on the other hand, when the gas supply system is damaged due to various reasons, the system can effectively improve the rapid recovery capability of the gas supply system.

[0048] like Figure 1 As shown, in this embodiment, the air pressure supply assembly includes an air compressor 51 and an air source buffer tank 52. The air compressor 51 is connected to the air source buffer tank 52 through a first gas pipeline 53. The air source buffer tank 52 is connected to the second cylinder 22 through a second gas pipeline 54. A first regulating valve 541 is provided on the second gas pipeline 54. The air compressor 51 can be used to fill the air source buffer tank 52 with pressurized gas. The provision of the air source buffer tank 52 is conducive to providing stable pressurized gas to the second cylinder 22.

[0049] like Figure 1 As shown, in this embodiment, the gas source buffer tank 52 is connected to the top of the liquid container 4 through the third gas pipeline 55, and the third gas pipeline 55 is provided with a second regulating valve 551. The gas pressure can be used to press the liquid in the liquid container 4 into the second cylinder 22, so there is no need to set a pump body, which reduces the cost.

[0050] like Figure 1 As shown, in this embodiment, a flow meter is also provided on the second pipe 41 for detecting the amount of liquid flowing from the second pipe 41 to the second cylinder 22 .

[0051] like Figure 1 and Figure 2 As shown, in this embodiment, the second cylinder 22 has an arc-shaped cylinder section that bends downward, the first pipe 31 is connected to the arc-shaped cylinder section 222, and the second pipe 41 is connected to the arc-shaped cylinder section. The arc-shaped cylinder section 222 is formed by the two ends of the second cylinder 22 bending upward. The arc-shaped cylinder section 222 is conducive to controlling the staying point of the detection bomb 33, thereby facilitating the liquid to soak the detection bomb 33.

[0052] like Figure 1 and Figure 2 As shown, in this embodiment, the first cylinder 21 has a nozzle 212 at one end facing the mounting frame 12, and the inner diameter of the nozzle 212 gradually decreases from the first cylinder 21 to the mounting frame 12. The nozzle 212 is conducive to extending into the nozzle of the pipe or pipeline. When the detection bullet body 33 is a sponge bullet, the nozzle size of the nozzle 212 can be slightly smaller than the diameter of the sponge bullet, which is conducive to further compressing the air in the first cylinder 21, and then ejecting the sponge bullet from the nozzle of the nozzle 212.

[0053] like Figure 1 and Figure 2 As shown, in this embodiment, an angular displacement sensor 112 is also included for detecting the rotation angle of the pipe rack. The detection position can be set according to the opening position of the first cylinder 21. The rotation angle of the pipe rack is detected by the angular displacement sensor 112 to ensure that the second driving member 111 can accurately rotate the mounting frame 12 to correspond to the detection position.

[0054] like Figure 1 and Figure 2 As shown, in this embodiment, the pellet container 3 has a top opening, and a container cover 34 detachably mounted on the top opening. The bottom of the pellet container 3 has an opening 35 connected to the first pipe 31, the height of the opening 35 is lower than the height of the bottom edge of the pellet container 3, the bottom end surface of the pellet container 3 extends obliquely downward from the edge of the bottom of the pellet container 3 to the opening 35, and the cross-sectional shape of the pellet container 3 can be funnel-shaped, thereby facilitating the detection bullet 33 to smoothly pass through the opening 35 and enter the first pipe 31.

[0055] like Figure 1 In this embodiment, a first detection element 36 is provided on the side wall of the pellet container 3. The first detection element 36 is suitable for being triggered when the number of detection bullets in the pellet container 3 is less than a predetermined number. For example, the first detection element 36 can be a tuning fork sensor. The tuning fork of the tuning fork sensor is located in the pellet container 3. When the number of detection bullets 33 decreases, the tuning fork of the tuning fork sensor will be exposed to the air, and then make a sound to remind the staff to replenish the detection bullets 33. Of course, the first detection element 36 can also be other sensors for detecting the number of detection bullets 33 in the pellet container 3, which can be triggered when the number of detection bullets 33 is less than the predetermined number.

[0056] like Figure 1 In this embodiment, the bottom of the collection cavity 13 has a bullet drop hole 14, and the bottom of the bullet drop hole 14 has a removable storage structure. The storage structure can collect the detection bullet 33 emitted in each detection, so as to judge the cleanliness of the corresponding pipe or pipeline later.

[0057] In this embodiment, a control unit 6 is also provided. For example, the control unit may be a PLC controller (Programmable Logic Controller, PLC). The control unit 6 may be connected to the above-mentioned drive components, switch valves, regulating valves and sensors. The control unit may control the above-mentioned detection process by compiling a program, which will not be described in detail here.

[0058] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. An automated detection system for the cleanliness of the inner wall of a pipe, characterized in that: include: A pipe rack, comprising a rack body (11) and a plurality of mounting racks (12) arranged at intervals on the rack body (11); A sponge bullet launching device is arranged on one side of the pipe rack, comprising a first cylinder (21), a second cylinder (22) and an air pressure supply assembly, wherein a first end of the second cylinder (22) is connected to the first cylinder (21), and a second end of the second cylinder (22) is connected to the air pressure supply assembly, and the air pressure supply assembly is suitable for optionally providing compressed air to the second cylinder (22); A pellet container (3) is arranged above the second cylinder (22); the pellet container (3) is connected to the second cylinder (22) via a first pipe (31); a first switch valve (32) is arranged on the first pipe (31); The liquid container (4) is connected to the second cylinder (22) through a second pipeline (41), and the second pipeline (41) is provided with a second switch valve (42); A first driving member is drivingly connected to the first cylinder (21) and is suitable for driving the first cylinder (21) to move toward or away from the mounting frame (12); The collecting chamber (13) is arranged on a side of the pipe rack away from the sponge bullet launching device and has an opening (35) facing the plurality of mounting racks (12).

2. The automatic detection system for the cleanliness of the inner wall of a pipe according to claim 1, characterized in that: The air pressure supply assembly comprises an air compressor (51) and an air source buffer tank (52); the air compressor (51) and the air source buffer tank (52) are connected via a first gas pipeline (53); the air source buffer tank (52) and the second cylinder (22) are connected via a second gas pipeline (54); and a first regulating valve (541) is provided on the second gas pipeline (54).

3. The automatic detection system for the cleanliness of the inner wall of a pipe according to claim 2, characterized in that: The gas source buffer tank (52) is connected to the top of the liquid container (4) via a third gas pipeline (55), and a second regulating valve (551) is provided on the third gas pipeline (55).

4. The automatic detection system for the cleanliness of the inner wall of a pipe according to claim 1, characterized in that: The second cylinder (22) has a downwardly curved arc-shaped cylinder section (222), the first pipeline (31) is connected to the arc-shaped cylinder section (222), and the second pipeline (41) is connected to the arc-shaped cylinder section (222).

5. The automatic detection system for the cleanliness of the inner wall of a pipe according to claim 1, characterized in that: One end of the first cylinder (21) facing the mounting frame (12) is provided with a nozzle, and the inner diameter of the nozzle gradually decreases in a direction from the first cylinder (21) toward the mounting frame (12).

6. The automatic detection system for the cleanliness of the inner wall of a pipe according to claim 1, characterized in that: A hose (23) is provided between the first cylinder (21) and the second cylinder (22); the first cylinder (21), the second cylinder (22) and the hose (23) have the same inner diameter.

7. The automatic detection system for the cleanliness of the inner wall of a pipe according to claim 1, characterized in that: The pipe rack is cylindrical in shape, and a plurality of mounting brackets (12) are arranged on the inner wall of the pipe rack, and the pipe rack is rotatably arranged; the second driving member (111) is drivingly connected to the pipe rack and is suitable for driving the pipe rack to rotate, and the central axis of the first cylinder (21) intersects with the rotation paths of the plurality of mounting brackets.

8. The automatic detection system for the cleanliness of the inner wall of a pipe according to claim 7, characterized in that: It also includes an angular displacement sensor (112) for detecting the rotation angle of the pipe rack.

9. The automatic detection system for the cleanliness of the inner wall of a pipe according to claim 1, characterized in that: The pellet container (3) has a top opening (35) and a container cover (34) detachably mounted on the top opening (35); the bottom of the pellet container (3) has an opening (35) connected to the first pipe (31); the height of the opening (35) is lower than the height of the bottom edge of the pellet container (3); and the bottom end surface of the pellet container (3) extends obliquely downward from the bottom edge of the pellet container (3) toward the opening (35).

10. The automatic detection system for the cleanliness of the inner wall of a pipe according to claim 8, characterized in that: A first detection element is arranged on the side wall of the pellet container (3), and the first detection element is suitable for being triggered when the pellets in the pellet container (3) are less than a predetermined number.

11. The automatic detection system for the cleanliness of the inner wall of a pipe according to claim 1, characterized in that: The bottom of the collecting cavity (13) is provided with a bullet drop hole (14), and the bottom of the bullet drop hole (14) is provided with a movably arranged storage structure.

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