Large diameter tubular workpiece inner wall cleaning device

Abstract

The present invention discloses a device for cleaning the inner wall of a large-diameter tubular workpiece, comprising a transverse main pipe, one end of which is passed through and fixed within a movable seat, and the other end of which is passed through the tubular workpiece. Two annular baffles arranged side by side are fixedly mounted on the end of the transverse main pipe away from the movable seat, and three rectangular baffles arranged in a circular pattern are fixedly mounted between the two annular baffles. A high-pressure cleaning chamber, a laser cleaning chamber, and a dehumidification and drying chamber are sequentially arranged in a counterclockwise direction, formed by the outer wall of the transverse main pipe, the inner walls of the two annular baffles facing each other, and the space between the rectangular baffles. A high-pressure cleaning gun arranged vertically upward is mounted within the high-pressure cleaning chamber, an inclined laser cleaning assembly is mounted within the laser cleaning chamber, and an inclined hot air purge gun is mounted within the dehumidification and drying chamber. The present invention can achieve automatic and efficient cleaning of the inner wall of a large-diameter tubular workpiece, and the cleaning process is free of dead angles and pollution, thereby meeting the requirements of direct anti-corrosion coating.

Description

Technical Field

[0001] The invention relates to a device for cleaning the inner wall of a large-diameter tubular workpiece, belonging to the technical field of large-diameter steel pipe processing and production. Background Art

[0002] Large-diameter steel pipes can be divided into various types depending on their application and specifications, including straight-seam large-diameter steel pipes, spiral-welded large-diameter steel pipes, and galvanized large-diameter steel pipes. Large-diameter steel pipes have a wide range of applications. Firstly, they are commonly used in the construction industry for supporting structures in high-rise buildings and bridge beams and columns. Secondly, in energy industries such as petroleum and natural gas, they are widely used in oil wells and natural gas transmission systems. Furthermore, large-diameter steel pipes are widely used in the chemical industry, water conservancy, transportation, manufacturing, and other fields. Their excellent performance meets the needs of various industries.

[0003] The inner wall of large-diameter steel pipes needs to be coated with anti-corrosion paint. Before coating, the inner surface of the pipe needs to be cleaned and rust-removed. Currently, large-diameter steel pipes are generally cleaned by manual rust removal and mechanical rust removal to remove loose rust, dirt, scale, grease, welding slag and other attachments on the inner surface of the pipe. These two cleaning methods still have the following shortcomings during use:

[0004] Sandblasting and shot blasting are the most commonly used mechanical rust removal methods. These processes generate a lot of dust, which is harmful to the environment and workers. Dead corners are prone to occur during rust removal, and the inner wall of the pipe after rust removal cannot be directly coated with an anti-corrosion coating. It must be cleaned to ensure that there are no impurities such as oil and dust. Only after cleaning and drying can the anti-corrosion coating be applied.

[0005] Manual rust removal involves manually polishing and cleaning the inner surface of pipes using handheld power tools. This method is labor-intensive, inefficient, and incomplete. It is also only suitable for workpieces with small rust removal areas. Comprehensive rust removal of the inner walls of large-diameter steel pipes is not only time-consuming and labor-intensive, but also ineffective. After rust removal, the inner wall of the pipe cannot be directly coated with an anti-corrosion coating. It must be cleaned to ensure it is free of dust and other impurities, and then dried before anti-corrosion coating can be applied.

[0006] In summary, the existing technology obviously has inconveniences and defects in actual use, so it is necessary to propose a new type of large-diameter tubular workpiece inner wall cleaning device to solve the bottleneck of the existing technology. Summary of the Invention

[0007] In view of the deficiencies in the background technology, the present invention provides a large-diameter tubular workpiece inner wall cleaning device, which can realize automatic and efficient cleaning of the inner wall of the large-diameter tubular workpiece. The cleaning process has no dead angles and no pollution, and can meet the requirements of direct anti-corrosion coating.

[0008] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0009] A device for cleaning the inner wall of a large-diameter tubular workpiece includes a transverse main pipe, one end of which is passed through and fixed in a movable seat, and the other end of which is passed through the tubular workpiece to be cleaned; two annular baffles arranged side by side are fixedly mounted on the end of the transverse main pipe away from the movable seat, and three rectangular baffles distributed in a circumferential manner are fixedly mounted between the two annular baffles;

[0010] The outer wall of the transverse main pipe, the inner walls of the two annular partitions facing each other, and the space between the rectangular partitions form a high-pressure cleaning chamber, a laser cleaning chamber, and a dehumidification and drying chamber arranged in sequence in a counterclockwise direction; a high-pressure cleaning spray gun arranged vertically upward is installed in the high-pressure cleaning chamber, an inclined laser cleaning assembly is installed in the laser cleaning chamber, and an inclined hot air purge spray gun is installed in the dehumidification and drying chamber;

[0011] A Y-shaped partition is fixedly installed inside the transverse main pipe. A wastewater discharge chamber, a smoke discharge chamber and a moisture discharge chamber are formed between the Y-shaped partition and the inner wall of the transverse main pipe, which are arranged in sequence in a counterclockwise direction. The wastewater discharge chamber is arranged corresponding to the high-pressure cleaning chamber, the smoke discharge chamber is arranged corresponding to the laser cleaning chamber, and the moisture discharge chamber is arranged corresponding to the dehumidification and drying chamber.

[0012] Furthermore, the movable seat is slidably arranged on the top of the frame, and the top of the frame is provided with two installation planes of different heights; a slide rail is installed on the high plane, and a slider is provided on the slide rail, and the slider is fixedly installed on the bottom of the movable seat, and the movable seat drives the transverse main pipe to slide along the slide rail; two roller groups driven by a motor are installed on the low plane, and the roller groups are used to support and drive the rotation of the tubular workpiece to be cleaned, and the axis of the tubular workpiece is collinear with the center line of the transverse main pipe.

[0013] Furthermore, the inner ring of the annular partition is fixedly connected to the outer wall of the transverse main pipe; the rectangular partition is fixedly connected to the facing inner walls of the two annular partitions and the outer wall of the transverse main pipe respectively; a ring-shaped bristle brush is installed on the periphery of the annular partition, and a long strip of bristle brush is installed on the periphery of the rectangular partition, and the bristle brush contacts the inner wall of the tubular workpiece.

[0014] Furthermore, a water inlet pipe is provided inside the wastewater discharge chamber, and the tail of the high-pressure cleaning spray gun passes through the pipe wall of the transverse main pipe and is connected to the water inlet pipe.

[0015] Furthermore, the wastewater discharge chamber is connected to the high-pressure cleaning chamber through drainage holes. The drainage holes are arranged in a row on the pipe wall of the transverse main pipe and are located at the lowest end of the high-pressure cleaning chamber. The drainage holes are used to introduce high-pressure cleaning wastewater into the wastewater discharge chamber; a wastewater outlet pipe is provided at one end of the wastewater discharge chamber.

[0016] Furthermore, the laser cleaning assembly includes a rectangular shell, and a transparent cover is provided in the middle of the side of the shell away from the transverse main pipe; a motor and a laser emitter arranged opposite to each other are installed inside the shell, and a reflective lens is installed between the laser emitter and the motor, and the reflective lens is tilted on the output shaft of the motor, and the reflective lens is located inside the transparent cover.

[0017] Furthermore, a wire threading tube is provided inside the smoke exhaust chamber, and a line connected to the laser cleaning component is passed through the wire threading tube.

[0018] Furthermore, the smoke exhaust chamber and the laser cleaning chamber are connected through smoke exhaust holes, and the smoke exhaust holes are arranged in rows on the pipe wall of the transverse main pipe. The smoke exhaust holes are used to suck the smoke generated during the laser cleaning process into the smoke exhaust chamber; a smoke outlet pipe is provided at one end of the smoke exhaust chamber, and the smoke outlet pipe is connected to the negative pressure suction device.

[0019] Furthermore, a hot air inlet pipe is provided inside the moisture discharge chamber, and the hot air inlet pipe is connected to the tail end of the hot air purge spray gun.

[0020] Furthermore, the moisture discharge chamber is connected to the dehumidification and drying chamber through moisture discharge holes, and the moisture discharge holes are arranged in rows on the pipe wall of the transverse main pipe. The moisture discharge holes are used to absorb the waste gas generated during the hot air blowing process into the moisture discharge chamber; a moisture outlet pipe is provided at one end of the moisture discharge chamber, and the moisture outlet pipe is connected to the negative pressure suction device.

[0021] After adopting the above technical solution, the present invention has the following advantages compared with the prior art:

[0022] The roller group drives the tubular workpiece to be cleaned to rotate. At the same time, the cleaning component moves horizontally inside the tubular workpiece. During the horizontal movement, the high-pressure cleaning gun in the high-pressure cleaning chamber, the laser cleaning component in the laser cleaning chamber, and the hot air blowing gun in the dehumidification and drying chamber work synchronously to achieve high-pressure flushing, wet laser cleaning, and hot air blowing on the inner wall of the tubular workpiece.

[0023] High-pressure cleaning is used to preliminarily clean the loose rust, dirt, scale, grease, welding slag and other attachments on the inner wall of the pipe. After high-pressure cleaning, the inner wall of the pipe is covered with a layer of water film. Then, after laser radiation, the liquid absorbs heat, boils, evaporates, and explodes to remove pollutants, achieving the purpose of secondary cleaning. Finally, hot air blowing is used to ensure that the inner wall is clean and dry, so that the inner wall can meet the requirements of direct coating of anti-corrosion paint.

[0024] The present invention realizes automatic and efficient cleaning of the inner wall of a large-diameter tubular workpiece. The cleaning process has no dead angle and no pollution, ensuring that the cleanliness and roughness of the inner surface of the pipe meet the requirements, and can improve the adhesion and anti-corrosion performance of the coating.

[0025] The present invention is described in detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the present invention;

[0027] Figure 2 yes Figure 1 Schematic diagram of the cross section at AA in the middle;

[0028] Figure 3 It is a schematic diagram of the internal structure of the transverse tube;

[0029] Figure 4 This is a schematic diagram of the installation of annular partitions and rectangular partitions;

[0030] Figure 5 It is a schematic diagram of the structure of the laser cleaning component;

[0031] Figure 6 It is a schematic diagram of the structure of the pipeline at the end of the transverse tube;

[0032] Figure 7 It is a schematic diagram of the present invention in working state.

[0033] In the figure, 1-transverse main pipe, 2-movable seat, 3-slider, 4-slide rail, 5-frame, 6-tubular workpiece, 7-roller group, 8-annular partition, 9-rectangular partition, 10-high-pressure cleaning chamber, 11-laser cleaning chamber, 12-dehumidification and drying chamber, 13-high-pressure cleaning spray gun, 14-laser cleaning component, 141-shell, 142-transparent cover, 143-reflective lens, 144-motor, 145-laser emitter, 15-hot air purge spray gun, 16-Y-shaped partition, 17-wastewater discharge chamber, 18-smoke discharge chamber, 19-moisture discharge chamber, 20-water inlet pipe, 21-threading pipe, 22-hot air inlet pipe, 23-drainage hole, 24-smoke exhaust hole, 25-moisture exhaust hole, 26-wastewater outlet pipe, 27-smoke outlet pipe, 28-moisture outlet pipe. DETAILED DESCRIPTION

[0034] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described with reference to the accompanying drawings.

[0035] like Figure 1-Figure 7 As shown together, the present invention provides a large-diameter tubular workpiece inner wall cleaning device, including a transverse main pipe 1, one end of the transverse main pipe 1 is passed through and fixed in a movable seat 2, the movable seat 2 is slidably set on the top of a frame 5, and the other end of the transverse main pipe 1 is passed through a tubular workpiece 6 to be cleaned.

[0036] The top of the frame 5 is provided with two installation planes of different heights; a slide rail 4 is installed on the high plane, and a slider 3 is provided on the slide rail 4. The slider 3 is fixedly installed at the bottom of the movable seat 2, and the movable seat 2 drives the transverse main pipe 1 to slide along the slide rail 4; two roller groups 7 driven by a motor are installed on the low plane, and the roller group 7 is used to support and drive the rotation of the tubular workpiece 6 to be cleaned, and the axis of the tubular workpiece 6 is collinear with the center line of the transverse main pipe 1.

[0037] Two annular partitions 8 arranged side by side are fixedly installed on the end of the transverse main pipe 1 away from the movable seat 2. The inner ring of the annular partition 8 is fixedly connected to the outer wall of the transverse main pipe 1. Three rectangular partitions 9 distributed in a circle are fixedly installed between the two annular partitions 8. The rectangular partitions 9 are respectively fixedly connected to the facing inner walls of the two annular partitions 8 and the outer wall of the transverse main pipe 1.

[0038] A high-pressure cleaning chamber 10, a laser cleaning chamber 11 and a dehumidification and drying chamber 12 are formed between the outer wall of the transverse main pipe 1, the inner walls of the two annular partitions 8 and the rectangular partition 9 in a counterclockwise direction.

[0039] A ring-shaped bristle brush is installed on the periphery of the annular partition 8, and a long strip of bristle brush is installed on the periphery of the rectangular partition 9. The bristle brush contacts the inner wall of the tubular workpiece 6 and can play the role of relatively sealing each chamber (the bristle brush is not shown in the figure).

[0040] A high-pressure cleaning spray gun 13 arranged vertically upward is installed inside the high-pressure cleaning chamber 10, a tilted laser cleaning component 14 is installed inside the laser cleaning chamber 11, and a tilted hot air purge spray gun 15 is installed inside the dehumidification and drying chamber 12. The high-pressure cleaning spray gun 13, the laser cleaning component 14 and the hot air purge spray gun 15 are arranged at 120 degrees in pairs.

[0041] A Y-shaped partition plate 16 is fixedly installed inside the transverse main pipe 1 , and an end portion of the Y-shaped partition plate 16 along the length direction is flush with an end portion of the transverse main pipe 1 .

[0042] A wastewater discharge chamber 17, a smoke discharge chamber 18 and a moisture discharge chamber 19 are formed between the Y-shaped partition 16 and the inner wall of the transverse main pipe 1, which are arranged in sequence in a counterclockwise direction. The wastewater discharge chamber 17 is arranged corresponding to the high-pressure cleaning chamber 10, the smoke discharge chamber 18 is arranged corresponding to the laser cleaning chamber 11, and the moisture discharge chamber 19 is arranged corresponding to the dehumidification and drying chamber 12.

[0043] A water inlet pipe 20 is provided inside the wastewater discharge chamber 17 , and the tail end of the high-pressure cleaning spray gun 13 passes through the pipe wall of the transverse main pipe 1 and is connected to the water inlet pipe 20 . The cleaning water enters the high-pressure cleaning spray gun 13 from the water inlet pipe 20 , and the high-pressure cleaning spray gun 13 performs high-pressure cleaning on the inner wall of the tubular workpiece 6 .

[0044] The wastewater discharge chamber 17 is connected to the high-pressure cleaning chamber 10 through drainage holes 23. The drainage holes 23 are arranged in a row on the pipe wall of the transverse main pipe 1 and are located at the lowest end of the high-pressure cleaning chamber 10. The drainage holes 23 are used to introduce high-pressure cleaning wastewater into the wastewater discharge chamber 17.

[0045] A wastewater outlet pipe 26 is provided at one end of the wastewater discharge chamber 17 .

[0046] The laser cleaning assembly 14 comprises a rectangular shell 141 , and a transparent cover 142 is provided at the middle of a side of the shell 141 away from the transverse main pipe 1 .

[0047] A motor 144 and a laser emitter 145 facing each other are installed inside the housing 141 . A reflective lens 143 is installed between the laser emitter 145 and the motor 144 . The reflective lens 143 is tilted on the output shaft of the motor 144 and is located inside the transparent cover 142 .

[0048] The motor 144 drives the reflective lens 143 to rotate, thereby reflecting the light spot incident from the laser emitter 145 into a strip-shaped light beam. After passing through the transparent cover 142, the strip-shaped light beam directly irradiates the inner wall surface of the tubular workpiece 6. Since the inner wall surface of the tubular workpiece 6 has been high-pressure cleaned, the inner wall surface of the tubular workpiece 6 is covered with a layer of water film before laser irradiation. After laser irradiation, the liquid absorbs heat, boils, evaporates, and explodes to carry away pollutants, thereby achieving the purpose of cleaning. It is not easy to damage the base material of the tubular workpiece 6, and the micron-level particles are cleaned more thoroughly.

[0049] A wire threading tube 21 is provided inside the smoke exhaust cavity 18 , and a line connected to the laser cleaning component 14 is passed through the wire threading tube 21 .

[0050] The smoke exhaust chamber 18 is connected to the laser cleaning chamber 11 through smoke exhaust holes 24. The smoke exhaust holes 24 are arranged in a row on the wall of the transverse main pipe 1. The smoke exhaust holes 24 are used to absorb the smoke generated during the laser cleaning process into the smoke exhaust chamber 18.

[0051] A smoke outlet pipe 27 is provided at one end of the smoke exhaust chamber 18 , and the smoke outlet pipe 27 is connected to a negative pressure suction device.

[0052] A hot air inlet pipe 22 is provided inside the moisture exhaust chamber 19, and the hot air inlet pipe 22 is connected to the tail end of the hot air purging spray gun 15. Hot air flows from the hot air inlet pipe 22 into the hot air purging spray gun 15 to purge the inner wall of the tubular workpiece 6, ensuring that the inner wall is clean and dry, so that the inner wall can meet the requirements of direct coating.

[0053] The moisture discharge chamber 19 is connected to the dehumidification and drying chamber 12 through moisture discharge holes 25. The moisture discharge holes 25 are arranged in a row on the pipe wall of the transverse main pipe 1. The moisture discharge holes 25 are used to absorb the waste gas generated during the hot gas blowing process into the moisture discharge chamber 19.

[0054] A moisture outlet pipe 28 is provided at one end of the moisture discharge chamber 19 , and the moisture outlet pipe 28 is connected to a negative pressure suction device.

[0055] The water inlet pipe 20 , wastewater outlet pipe 26 , threading pipe 21 , smoke outlet pipe 27 , hot air inlet pipe 22 and wet air outlet pipe 28 all pass through one end of the transverse main pipe 1 .

[0056] The specific working principle of the present invention is:

[0057] The tubular workpiece 6 to be cleaned is placed on the roller group 7, and the roller group 7 drives the tubular workpiece 6 to rotate. At the same time, the cleaning component at the end of the transverse main pipe 1 is placed in the tubular workpiece 6, and the movable seat 2 can drive the transverse main pipe 1 and the cleaning component to slide along the slide rail 4; during the sliding process, the high-pressure cleaning gun 13 in the high-pressure cleaning chamber 10, the laser cleaning component 14 in the laser cleaning chamber 11, and the hot air blowing gun 15 in the dehumidification and drying chamber 12 work synchronously to achieve high-pressure flushing, wet laser cleaning and hot air blowing of the inner wall of the tubular workpiece 6.

[0058] The cleaning water enters the high-pressure cleaning gun 13 in the high-pressure cleaning chamber 10 from the water inlet pipe 20. The high-pressure cleaning gun 13 performs high-pressure cleaning on the inner wall of the tubular workpiece 6, and preliminarily cleans the soft floating rust, dirt, oxide scale, grease, welding slag and other attachments on the inner wall of the tube; the cleaning wastewater in the high-pressure cleaning chamber 10 is collected under the action of gravity, enters the wastewater discharge chamber 17 through the drainage hole 23, and is then discharged through the wastewater outlet pipe 26.

[0059] The wall surface cleaned by the high-pressure cleaning chamber 10 rotates to the laser cleaning chamber 11, and the reflective lens 143 rotates to reflect the light spot emitted by the laser emitter 145 into a strip-shaped light beam. The strip-shaped light beam directly irradiates the inner wall surface of the tubular workpiece 6 after passing through the transparent cover 142. Since the inner wall surface of the tubular workpiece 6 has been cleaned by high pressure, the inner wall surface of the tubular workpiece 6 has been covered with a layer of water film before laser irradiation. After laser irradiation, the liquid absorbs heat, boils, evaporates, and explodes to carry away pollutants, achieving the purpose of secondary cleaning and realizing wet laser cleaning. Wet laser cleaning is not easy to damage the base material of the tubular workpiece 6, and cleans micron-level particles more thoroughly.

[0060] The wall surface cleaned by the laser cleaning chamber 11 rotates to the dehumidification and drying chamber 12, and the hot air flows into the hot air blowing gun 15 from the hot air inlet pipe 22 to blow the inner wall of the tubular workpiece 6. The blown waste gas is sucked into the moisture discharge chamber 19 and then discharged from the moisture outlet pipe 28 to ensure the cleanliness and dryness of the inner wall, so that the inner wall can meet the requirements of direct coating of anti-corrosion paint.

[0061] The inner wall of the tubular workpiece 6 is subjected to high-pressure washing, wet laser cleaning, and hot air blowing to ensure that the cleanliness and roughness of the inner surface of the tube meet the requirements, which can improve the adhesion and anti-corrosion performance of the coating.

[0062] The foregoing is an example of the best mode of carrying out the present invention. Any portion not described in detail herein is common knowledge within the skill of one of ordinary skill in the art. The scope of protection of the present invention is determined by the claims. Any equivalent transformation based on the technical teachings of the present invention is also within the scope of protection of the present invention.

Claims

1. Large diameter tubular workpiece inner wall cleaning device, characterized by: The invention comprises a transverse main pipe (1), one end of which is passed through and fixed in a movable seat (2), and the other end of which is passed through a tubular workpiece (6) to be cleaned; two annular partitions (8) arranged side by side are fixedly mounted on the end of the transverse main pipe (1) away from the movable seat (2), and three rectangular partitions (9) distributed in a circumferential manner are fixedly mounted between the two annular partitions (8); A high-pressure cleaning chamber (10), a laser cleaning chamber (11), and a dehumidification and drying chamber (12) are formed between the outer wall of the transverse main pipe (1), the inner walls of the two annular partitions (8), and the rectangular partition (9) in a counterclockwise direction. A high-pressure cleaning spray gun (13) arranged vertically upward is installed inside the high-pressure cleaning chamber (10), a laser cleaning assembly (14) arranged obliquely is installed inside the laser cleaning chamber (11), and a hot air purge spray gun (15) arranged obliquely is installed inside the dehumidification and drying chamber (12). A Y-shaped partition (16) is fixedly installed inside the transverse main pipe (1). A wastewater discharge chamber (17), a smoke discharge chamber (18), and a moisture discharge chamber (19) are formed between the Y-shaped partition (16) and the inner wall of the transverse main pipe (1) in a counterclockwise direction. The wastewater discharge chamber (17) is arranged correspondingly to the high-pressure cleaning chamber (10), the smoke discharge chamber (18) is arranged correspondingly to the laser cleaning chamber (11), and the moisture discharge chamber (19) is arranged correspondingly to the dehumidification and drying chamber (12).

2. The large-diameter tubular workpiece inner wall cleaning device according to claim 1, characterized in that: The movable seat (2) is slidably arranged on the top of the frame (5), and the top of the frame (5) is provided with two installation planes of different heights; a slide rail (4) is installed on the high plane, a slider (3) is provided on the slide rail (4), and the slider (3) is fixedly installed on the bottom of the movable seat (2), and the movable seat (2) drives the transverse main pipe (1) to slide along the slide rail (4); two roller groups (7) driven by a motor are installed on the low plane, and the roller groups (7) are used to support and drive the rotation of the tubular workpiece (6) to be cleaned, and the axis of the tubular workpiece (6) is arranged in a collinear manner with the center line of the transverse main pipe (1).

3. The large-diameter tubular workpiece inner wall cleaning device according to claim 1, characterized in that: The inner ring of the annular partition (8) is fixedly connected to the outer wall of the transverse main pipe (1); the rectangular partition (9) is fixedly connected to the inner walls of the two annular partitions (8) and the outer wall of the transverse main pipe (1); a circular bristle brush is installed on the periphery of the annular partition (8), and a long strip of bristle brush is installed on the periphery of the rectangular partition (9), and the bristle brush contacts the inner wall of the tubular workpiece (6).

4. The large-diameter tubular workpiece inner wall cleaning device according to claim 1, characterized in that: A water inlet pipe (20) is provided inside the wastewater discharge chamber (17), and the tail of the high-pressure cleaning spray gun (13) passes through the wall of the transverse main pipe (1) and is connected to the water inlet pipe (20).

5. The device for cleaning the inner wall of a large-diameter tubular workpiece according to claim 4, characterized in that: The wastewater discharge chamber (17) is connected to the high-pressure cleaning chamber (10) via drainage holes (23). The drainage holes (23) are arranged in a row on the wall of the transverse main pipe (1) and are located at the lowest end of the high-pressure cleaning chamber (10). The drainage holes (23) are used to introduce high-pressure cleaning wastewater into the wastewater discharge chamber (17). A wastewater outlet pipe (26) is provided at one end of the wastewater discharge chamber (17).

6. The device for cleaning the inner wall of a large-diameter tubular workpiece according to claim 1, wherein: The laser cleaning assembly (14) comprises a rectangular shell (141), wherein a transparent cover (142) is provided at a middle position on a side of the shell (141) away from the transverse main pipe (1); a motor (144) and a laser emitter (145) arranged opposite to each other are installed inside the shell (141), a reflective lens (143) is installed between the laser emitter (145) and the motor (144), the reflective lens (143) is tilted on the output shaft of the motor (144), and the reflective lens (143) is located inside the transparent cover (142).

7. The device for cleaning the inner wall of a large-diameter tubular workpiece according to claim 1, wherein: A threading tube (21) is provided inside the smoke exhaust cavity (18), and a line connected to the laser cleaning component (14) is passed through the threading tube (21).

8. The device for cleaning the inner wall of a large-diameter tubular workpiece according to claim 7, wherein: The smoke exhaust chamber (18) is connected to the laser cleaning chamber (11) via a smoke exhaust hole (24). The smoke exhaust holes (24) are arranged in a row on the wall of the transverse main pipe (1). The smoke exhaust holes (24) are used to absorb smoke generated during the laser cleaning process into the smoke exhaust chamber (18). A smoke outlet pipe (27) is provided at one end of the smoke exhaust chamber (18), and the smoke outlet pipe (27) is connected to a negative pressure suction device.

9. The device for cleaning the inner wall of a large-diameter tubular workpiece according to claim 1, wherein: A hot air inlet pipe (22) is provided inside the moisture discharge chamber (19), and the hot air inlet pipe (22) is connected to the tail end of the hot air purge spray gun (15).

10. The device for cleaning the inner wall of a large-diameter tubular workpiece according to claim 9, characterized in that: The moisture discharge chamber (19) is connected to the dehumidification and drying chamber (12) via moisture discharge holes (25). The moisture discharge holes (25) are arranged in a row on the pipe wall of the transverse main pipe (1). The moisture discharge holes (25) are used to absorb the waste gas generated during the hot gas purge process into the moisture discharge chamber (19). A moisture outlet pipe (28) is provided at one end of the moisture discharge chamber (19), and the moisture outlet pipe (28) is connected to a negative pressure suction device.

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