An anti-corrosion treatment device for the inner wall of a carbon steel square tube

Abstract

The invention relates to an inner wall anti-corrosion treatment device for a carbon steel square tube in the field of spraying equipment. The device realizes rapid clamping and self-rotation of a square tube body by installing a plurality of pairs of clamping tubes which are arranged oppositely and can rotate on a rotating frame, so as to facilitate rapid and uniform spreading of pickling solution and anti-corrosion paint in a rectangular inner cavity of the square tube body, thereby improving the cleaning effect of the pickling solution and the uniformity of anti-corrosion paint spraying. The device also performs close brushing of the inner wall of the rectangular inner cavity of the square tube body during the pickling process by connecting a brush rope with a winding device and a counterweight ball, thereby further improving the cleaning effect of rust on the inner wall of the square tube body. In addition, the rotating frame and the clamping tube are used to realize rapid switching between the pickling process and the anti-corrosion paint spraying process, thereby reducing the lifting and transfer of the square tube body between different process equipment, thereby improving the integration of the production line and improving the anti-corrosion treatment efficiency of the inner wall of the square tube body.

Description

Technical Field

[0001] The invention relates to a pipeline anti-corrosion treatment device, in particular to an inner wall anti-corrosion treatment device for a carbon steel square pipe applied in the field of spraying equipment. Background Art

[0002] Carbon steel square tube is a square tube made of iron-carbon alloy with carbon and iron as the main components. It is widely used in construction, petrochemical, shipbuilding and other fields. It has a strong structure and strong bearing capacity, but due to long-term exposure to the natural environment, it is susceptible to oxidation, water corrosion and other factors, resulting in surface corrosion, reducing service life, and even threatening structural safety. Therefore, it is very important to carry out anti-corrosion treatment on carbon steel square tubes.

[0003] Generally, when the inner wall of a pipeline is treated for corrosion, it is necessary to clean the inner wall of the pipeline first and then spray the anti-corrosion paint. Since the inner cavity of the carbon steel square tube is a rectangular cavity, the traditional anti-corrosion device cannot clean the inner wall of the rectangular cavity well, which affects the quality of subsequent anti-corrosion paint spraying. Summary of the invention

[0004] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is that the rectangular inner cavity of the carbon steel square tube is difficult to clean, which affects the subsequent spraying quality.

[0005] In order to solve the above problems, the present invention provides an inner wall anti-corrosion treatment device for a carbon steel square tube, comprising a mounting seat and a square tube body; a rotating frame arranged obliquely and connected to a driving mechanism is installed above the mounting seat, an upper fixed plate and a lower fixed plate are rotatably connected to the upper and lower ends of the rotating frame respectively, and a plurality of pairs of clamping cylinders rotatably connected to the rotating frame and distributed equidistantly in a circle are installed on the rotating frame; a first upper filling cylinder and a second upper filling cylinder movably connected to the clamping cylinder are fixedly connected to the upper fixed plate, and a first lower recovery cylinder and a second lower recovery cylinder movably connected to the clamping cylinder are fixedly connected to the lower fixed plate, the first upper filling cylinder and the first lower recovery cylinder are arranged opposite to each other, and the second upper filling cylinder and the second lower recovery cylinder are arranged opposite to each other;

[0006] A passive gear ring is fixedly connected to the outside of the clamping cylinder located on the upper side of the rotating frame and distributed in a circumference, a driving gear disc is meshed with the inside of the passive gear ring, a driving gear disc is meshed with a driving gear, and the driving gear is connected to a second motor installed on the rotating frame;

[0007] The upper fixed plate is located on one side of the first upper filling cylinder and is provided with a winding device. The winding device is wound with a brush rope that passes through the first upper filling cylinder, the clamping cylinder located above, the square tube body, the clamping cylinder located below and extends to the first lower recovery cylinder in sequence, and a counterweight ball is fixedly connected to the end of the brush rope; the first upper filling cylinder is provided with an acid filling pipe connected to an external acid supply device, the first lower recovery cylinder is connected with an acid recovery pipe, the second upper filling cylinder is provided with an anti-corrosion paint filling pipe connected to an external anti-corrosion paint supply device, and the second lower recovery cylinder is connected with an anti-corrosion paint recovery pipe.

[0008] In the above-mentioned inner wall anti-corrosion treatment device for carbon steel square tubes, efficient cleaning of the rectangular inner cavity of the square tube body is achieved through the self-rotating clamping cylinder and the brush rope connected with the weighted ball.

[0009] As a further improvement of the present application, a clean water filling pipe and a first exhaust pipe connected to an external clean water supply device are provided in the first upper filling cylinder, and a first hot air filling pipe is provided in the first lower recovery cylinder; a second hot air filling pipe is provided in the second lower recovery cylinder, and the second upper filling cylinder is connected to a second exhaust pipe.

[0010] As a further improvement of the present application, the clamping cylinder includes a mounting plate rotatably connected to the rotating frame and having a hollow structure, a plug-in cylinder slidably connected to the inner side of the mounting plate is sleeved, the plug-in cylinder is connected to a first electric telescopic rod installed on the inner end surface of the mounting plate, a connecting cylinder is provided on the outer side of the mounting plate, the connecting cylinder is connected to a second electric telescopic rod installed on the outer end surface of the mounting plate; the clamping and release of the opposite tube body is achieved by the toward or away movement of a pair of plug-in cylinders on a pair of relatively arranged clamping cylinders, and the connection and disconnection of the clamping cylinder with the first upper filling cylinder, the second upper filling cylinder, the first lower recovery cylinder and the second lower recovery cylinder is achieved by the movement of the connecting cylinder arranged on the outer side of the clamping cylinder.

[0011] As a further improvement of the present application, the rotating frame includes a cylindrical part and a disc part fixed on both sides of the cylindrical part. The outer side of the disc part is rotatably connected to the upper fixed plate and the lower fixed plate respectively through a pair of mounting shafts, and the mounting shaft located on the lower side is connected to the first motor.

[0012] As a further improvement of the present application, the mounting disk is nested in the disk portion and rotatably connected to the disk portion. The mounting disk includes an inner disk and a rectangular tube passing through the inner disk. The plug-in tube and the connecting tube are respectively sleeved on both sides of the rectangular tube.

[0013] As a further improvement of the present application, a notch groove is provided on the inner side of the plug-in cylinder, a cylindrical portion is provided on the outer side of the connecting cylinder, and an annular groove for inserting the cylindrical portion is provided at the outer end openings of the first upper filling cylinder, the first lower recovery cylinder, the second upper filling cylinder and the second lower recovery cylinder.

[0014] As a further improvement of the present application, the brush rope is an elastic rope and has evenly distributed bristles bonded to the surface.

[0015] As a further improvement of the present application, a permanent magnet is nested in the counterweight ball, and an electromagnetic coil is installed in the circumferential side wall of the first lower recovery cylinder.

[0016] In summary, the present invention realizes rapid clamping and rotation of the square tube body by installing multiple pairs of relatively arranged and rotatable clamping cylinders on a rotating frame, which is convenient for rapid and uniform spreading of pickling solution and anti-corrosion paint in the rectangular inner cavity of the square tube body, improves the cleaning effect of the pickling solution and the uniformity of anti-corrosion paint spraying, and uses a brush rope connected with a winding device and a counterweight ball to fit and brush the inner wall of the rectangular inner cavity of the square tube body during the pickling process, thereby further improving the cleaning effect of rust on the inner wall of the square tube body; in addition, the rotating frame and the clamping cylinder are used to realize rapid switching of the pickling process and the anti-corrosion paint spraying process, thereby reducing the lifting and transfer of the square tube body between different process equipment, improving the integration of the production line, and improving the anti-corrosion treatment efficiency of the inner wall of the square tube body. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the three-dimensional structure of this application;

[0018] Figure 2 It is a schematic diagram of the cross-sectional structure of this application;

[0019] Figure 3 for Figure 2 A schematic diagram of the enlarged structure at A in the middle;

[0020] Figure 4 for Figure 2 A schematic diagram of the enlarged structure at B in the middle;

[0021] Figure 5 for Figure 2 Schematic diagram of the enlarged structure at C in the middle;

[0022] Figure 6 for Figure 2 Schematic diagram of the enlarged structure at D in the middle;

[0023] Figure 7 This is a schematic diagram of the exploded assembly of the rotating frame in this application;

[0024] Figure 8 It is a schematic diagram of the exploded assembly of the clamping tube in this application;

[0025] Fig. 9 It is a schematic diagram of the movement of the rotating frame and the clamping cylinder in this application.

[0026] Description of the numbers in the figure:

[0027] 1. Mounting seat; 2. Rotating frame; 201. Cylinder; 202. Disc; 3. Square tube body; 4. Clamping cylinder; 5. First upper filling cylinder; 6. First lower recovery cylinder; 7. Second upper filling cylinder; 8. Second lower recovery cylinder; 9. Upper fixing plate; 10. Lower fixing plate; 11. Brush rope; 1101. Brush hair; 12. Winding device; 13. Counterweight ball; 1301. Permanent magnet; 14. Mounting shaft; 15. First motor; 16. Mounting disk; 1601. Inner disk; 1602. Rectangular tube; 17. Plug Cylinder; 1701, notch groove; 18, first electric telescopic rod; 19, connecting cylinder; 1901, cylindrical part; 20, second electric telescopic rod; 21, acid filling pipe; 22, clean water filling pipe; 23, first exhaust pipe; 24, passive gear ring; 25, active gear plate; 26, driving gear; 27, second motor; 28, electromagnetic coil; 29, acid recovery pipe; 30, first hot air filling pipe; 31, anticorrosive paint filling pipe; 32, second exhaust pipe; 33, anticorrosive paint recovery pipe; 34, second hot air filling pipe. DETAILED DESCRIPTION

[0028] Two implementation modes of the present application are described in detail below with reference to the accompanying drawings.

[0029] The first implementation method:

[0030] Figure 1-9 A device for treating the inner wall of a carbon steel square tube is shown, comprising a mounting seat 1 and a square tube body 3; a rotating frame 2 which is inclined and connected to a driving mechanism is installed above the mounting seat 1, an upper fixed plate 9 which is fixedly connected to the mounting seat 1 is rotatably connected above the rotating frame 2, a lower fixed plate 10 which is fixedly connected to the mounting seat 1 is rotatably connected below the rotating frame 2, a plurality of pairs of clamping cylinders 4 which are equidistantly distributed circumferentially and rotatably connected to the rotating frame 2 are installed on the rotating frame 2, and the inner sides of the clamping cylinders 4 are plug-connected to the square tube body 3; a first upper filling cylinder 5 and a second upper filling cylinder 7 which are movably connected and cooperated with the clamping cylinder 4 are fixedly connected to the upper fixed plate 9, a first lower recovery cylinder 6 and a second lower recovery cylinder 8 which are movably connected and cooperated with the clamping cylinder 4 are fixedly connected to the lower fixed plate 10, the first upper filling cylinder 5 and the first lower recovery cylinder 6 are arranged opposite to each other, and the second upper filling cylinder 7 and the second lower recovery cylinder 8 are arranged opposite to each other;

[0031] A passive gear ring 24 is fixedly connected to the outside of the clamping cylinder 4 which is located on the upper side of the rotating frame 2 and is distributed in a circumference. A driving gear disc 25 is meshed with the inside of the passive gear ring 24. The driving gear disc 25 is meshed with a driving gear 26. The driving gear 26 is connected to a second motor 27 installed on the rotating frame 2. The second motor 27 drives the passive gear ring 24 and the clamping cylinder 4 to rotate through the driving gear 26 and the driving gear disc 25.

[0032] The upper fixed plate 9 is located on one side of the first upper filling cylinder 5 and is provided with a winding device 12. The winding device 12 is wound with a brush rope 11 that passes through the first upper filling cylinder 5, the clamping cylinder 4 located above, the square tube body 3, the clamping cylinder 4 located below and extends to the first lower recovery cylinder 6 in sequence. The end of the brush rope 11 is fixedly connected to a counterweight ball 13; the first upper filling cylinder 5 is provided with an acid filling pipe 21 connected to an external acid supply device, the first lower recovery cylinder 6 is connected to an acid recovery pipe 29, the second upper filling cylinder 7 is provided with an anti-corrosion paint filling pipe 31 connected to an external anti-corrosion paint supply device, and the second lower recovery cylinder 8 is connected to an anti-corrosion paint recovery pipe 33.

[0033] See also Figure 3 and Figure 8 The clamping cylinder 4 includes a mounting plate 16 which is rotatably connected to the rotating frame 2 and has a hollow structure. A plug-in cylinder 17 which is slidably connected to the mounting plate 16 is sleeved on the inner side of the mounting plate 16. The plug-in cylinder 17 is connected to a first electric telescopic rod 18 installed on the inner end surface of the mounting plate 16. A connecting cylinder 19 is provided on the outer side of the mounting plate 16. The connecting cylinder 19 is connected to a second electric telescopic rod 20 installed on the outer end surface of the mounting plate 16. The clamping and release of the other pipe body 3 are realized by the oppositely arranged pair of plug-in cylinders 17 on the pair of clamping cylinders 4 moving toward or away from each other. The connection and disconnection of the clamping cylinder 4 with the first upper filling cylinder 5, the second upper filling cylinder 7, the first lower recovery cylinder 6 and the second lower recovery cylinder 8 are realized by the movement of the connecting cylinder 19 arranged on the outer side of the clamping cylinder 4.

[0034] For details, please refer to Figure 2 and Fig. 9 When performing anti-corrosion treatment on the inner wall of carbon steel square tube, the following steps are included:

[0035] Step 1: Start the first electric telescopic rod 18, so that the pair of relatively arranged plug-in tubes 17 first move away and then move closer, during which the square tube body 3 with treatment is placed in the plug-in tube 17 to clamp the square tube body 3;

[0036] Step 2: Start the driving mechanism of the rotating frame 2, and the rotating frame 2 drives the pair of clamping cylinders 4 holding the square tube body 3 to move to the position between the first upper filling cylinder 5 and the first lower recovery cylinder 6, and then start the second electric telescopic rod 20, so that the connecting cylinders 19 located outside the clamping cylinders 4 on both sides of the square tube body 3 are connected to the first upper filling cylinder 5 and the first lower recovery cylinder 6 respectively;

[0037] Step 3, start the winding device 12, the winding device 12 releases the brush rope 11, and at the same time, under the gravity of the counterweight ball 13, the counterweight ball 13 drives the brush rope 11 to pass through the first upper filling cylinder 5, the clamping cylinder 4 connected to the first upper filling cylinder 5, the rectangular inner cavity of the square tube body 3, the clamping cylinder 4 connected to the first lower recovery cylinder 6, and then enter the first lower recovery cylinder 6;

[0038] Step 4: Start the external acid supply device and the second motor 27, inject the pickling liquid into the rotating square tube body 3 through the acid filling pipe 21, and the second motor 27 drives the square tube body 3 to rotate through the clamping tube 4, so that the pickling liquid entering the square tube body 3 is subjected to the action of gravity and centrifugal force at the same time, so that the pickling liquid is fully diffused on the inner wall of the square tube body 3; at the same time, the brush rope 11 is attached to the inner wall of the rotating square tube body 3 under the traction of the counterweight ball 13, and the inner wall of the rectangular cavity of the square tube body 3 is attached and brushed;

[0039] Step 5: After the rectangular inner cavity of the square tube body 3 is cleaned, the external acid supply device and the second motor 27 are turned off and the brush rope 11 and the weight ball 13 are recovered through the winding device 12, so that the weight ball 13 returns to the first upper filling cylinder 5; the second electric telescopic rod 20 is started again, so that the pair of connecting cylinders 19 outside the clamping cylinder 4 on both sides of the square tube body 3 are separated from the first upper filling cylinder 5 and the first lower recovery cylinder 6 respectively;

[0040] Step 6: Start the driving mechanism of the rotating frame 2, and the rotating frame 2 drives the square tube body 3 to move between the second upper filling cylinder 7 and the second lower recovery cylinder 8. Then, start the second electric telescopic rod 20, so that a pair of connecting cylinders 19 located outside the clamping cylinders 4 on both sides of the square tube body 3 are connected to the second upper filling cylinder 7 and the second lower recovery cylinder 8 respectively;

[0041] Step seven, start the external anti-corrosion paint supply device and the second motor 27, the anti-corrosion paint filling pipe 31 sprays the anti-corrosion paint into the rotating square tube body 3, and the anti-corrosion paint is evenly spread on the inner wall of the rectangular inner cavity of the square tube body 3 under the combined action of its own gravity and the centrifugal force generated by the rotation of the square tube body 3.

[0042] Compared with the traditional carbon steel square tube inner wall anti-corrosion treatment device, the present invention realizes the rapid clamping and rotation movement of the square tube body 3 by installing multiple pairs of relatively arranged and rotatable clamping cylinders 4 on the rotating frame 2, which is convenient for the rapid and uniform spreading of the pickling solution and anti-corrosion paint in the rectangular inner cavity of the square tube body 3, improves the cleaning effect of the pickling solution and the uniformity of the anti-corrosion paint spraying, and uses a brush rope 11 connected with a winding device 12 and a counterweight ball 13 to fit the inner wall of the rectangular inner cavity of the square tube body 3 during the pickling process, thereby further improving the cleaning effect of the rust on the inner wall of the square tube body 3; in addition, the rotating frame 2 and the clamping cylinder 4 are used to realize the rapid switching of the pickling process and the anti-corrosion paint spraying process, reduce the lifting and transfer of the square tube body 3 between different process equipment, improve the integration of the production line, and improve the anti-corrosion treatment efficiency of the inner wall of the square tube body 3.

[0043] See also Figure 7The rotating frame 2 includes a cylindrical portion 201 and a disc portion 202 fixed on both sides of the cylindrical portion 201. The outer side of the disc portion 202 is rotatably connected to the upper fixed plate 9 and the lower fixed plate 10 through a pair of mounting shafts 14, and the mounting shaft 14 located at the lower side is connected to the first motor 15.

[0044] Specifically, the square tube body 3 is rotated in a circular motion to realize the switching between the pickling process and the painting process.

[0045] See also Figure 7 The mounting disk 16 is nested in the disk portion 202 and is rotatably connected to the disk portion 202 . The mounting disk 16 includes an inner disk 1601 and a rectangular tube 1602 penetrating the inner disk 1601 . The plug-in tube 17 and the connecting tube 19 are respectively sleeved on both sides of the rectangular tube 1602 .

[0046] Specifically, it is convenient to realize the self-rotation of the clamping cylinder 4.

[0047] See also Figure 8 A notch groove 1701 is provided on the inner side of the plug-in cylinder 17, a cylindrical portion 1901 is provided on the outer side of the connecting cylinder 19, and an annular groove for inserting the cylindrical portion 1901 is provided at the outer end openings of the first upper filling cylinder 5, the first lower recovery cylinder 6, the second upper filling cylinder 7 and the second lower recovery cylinder 8.

[0048] Specifically, the notch groove 1701 facilitates the insertion of the square tube body 3 into the clamping cylinder 4 and the sleeve clamping, and the cylindrical portion 1901 facilitates the connection and relative rotation of the connecting cylinder 19 with the first upper filling cylinder 5, the first lower recovery cylinder 6, the second upper filling cylinder 7 and the second lower recovery cylinder 8.

[0049] See also Figure 7 The brush rope 11 is an elastic rope and has evenly distributed bristles 1101 bonded on the surface.

[0050] Specifically, the brush rope 11 has a better effect of fitting the inner wall of the square tube body 3 .

[0051] Second implementation method:

[0052] Figure 3-6 A device for treating the inner wall of a carbon steel square tube against corrosion is shown. On the basis of the first embodiment, a clean water filling pipe 22 and a first exhaust pipe 23 connected to an external clean water supply device are provided in the first upper filling cylinder 5, a first hot air filling pipe 30 is provided in the first lower recovery cylinder 6; a second hot air filling pipe 34 is provided in the second lower recovery cylinder 8, and a second exhaust pipe 32 is connected to the second upper filling cylinder 7.

[0053] Specifically, after the pickling of the square tube body 3 is completed in step four, the clean water is rinsed through the clean water filling pipe 22, and the inner wall of the square tube body 3 and the brush rope 11 are rinsed with clean water. After rinsing, the hot air flow is injected from the first lower recovery cylinder 6 through the first hot air filling pipe 30, and the hot air flow is sprayed upward to dry the inner wall of the square tube body 3 and the brush rope 11. Similarly, hot air is injected through the second hot air filling pipe 34 of the second lower recovery cylinder 8 to dry the painted inner wall of the square tube body 3 after painting, and discharged from the second exhaust pipe 32; by rinsing and drying the inner wall of the square tube body 3, the acid residue is reduced, which is convenient for subsequent painting, and the painted surface of the inner wall of the square tube body 3 is evenly dried by the hot air flow, thereby improving the paint surface molding quality. At the same time, the service life of each component is extended, and there is no need to set up drying equipment separately, further improving the integration of the equipment.

[0054] See also Figure 4 A permanent magnet 1301 is nested in the counterweight ball 13 , and an electromagnetic coil 28 is installed in the circumferential side wall of the first lower recovery cylinder 6 .

[0055] Specifically, when the inner wall of the square tube body 3 is pickled and washed with water, the electromagnetic coil 28 is started, and the magnetic field generated by the electromagnetic coil 28 magnetically attracts the permanent magnet 1301 in the counterweight ball 13, thereby further increasing the fitting pressure between the brush rope 11 and the inner wall of the square tube body 3 and improving the brushing quality. The magnetic attraction force is changed by controlling the current intensity of the electromagnetic coil 28, thereby changing the contact pressure between the brush rope 11 and the inner wall of the square tube body 3 to adapt to different brushing requirements. At the same time, since the counterweight ball 13 is at the active end, the rectangular inner cavity of the square tube body 3 will not interfere with the brush rope 11 while ensuring the fitting requirements.

[0056] In view of current practical needs, the above-mentioned implementation mode adopted in this application is not limited to the scope of protection. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the scope of protection of the present invention.

Claims

1. An inner wall anti-corrosion treatment device for a carbon steel square tube, characterized in that: The invention comprises a mounting seat (1) and a square tube body (3); a rotating frame (2) which is inclined and connected to a driving mechanism is mounted above the mounting seat (1); an upper fixed plate (9) and a lower fixed plate (10) are rotatably connected to the upper and lower ends of the rotating frame (2), respectively; a plurality of pairs of clamping cylinders (4) which are equidistantly distributed in a circle and rotatably connected to the rotating frame (2) are mounted on the rotating frame (2); a first upper filling cylinder (5) and a second upper filling cylinder (7) which are movably connected to and cooperate with the clamping cylinder (4) are fixedly connected to the upper fixed plate (9); a first lower recovery cylinder (6) and a second lower recovery cylinder (8) which are movably connected to and cooperate with the clamping cylinder (4) are fixedly connected to the lower fixed plate (10); the first upper filling cylinder (5) and the first lower recovery cylinder (6) are arranged opposite to each other, and the second upper filling cylinder (7) and the second lower recovery cylinder (8) are arranged opposite to each other; A passive gear ring (24) is fixedly connected to the outside of a clamping cylinder (4) located on the upper side of the rotating frame (2) and distributed in a circumferential manner, a driving gear disc (25) is meshed inside the passive gear ring (24), a driving gear disc (25) is meshed with a driving gear (26), and the driving gear (26) is connected to a second motor (27) mounted on the rotating frame (2); The upper fixing plate (9) is provided with a winding device (12) on one side of the first upper filling cylinder (5), and the winding device (12) winds a brush rope (11) which passes through the first upper filling cylinder (5), the clamping cylinder (4) located above, the square tube body (3), the clamping cylinder (4) located below and extends to the first lower recovery cylinder (6), and the end of the brush rope (11) is fixedly connected to a weight ball (13); the brush rope (11) is an elastic rope and has evenly distributed bristles (1101) bonded to its surface; A permanent magnet (1301) is nested and installed in the counterweight ball (13), and an electromagnetic coil (28) is installed in the circumferential side wall of the first lower recovery cylinder (6); an acid liquid filling pipe (21) connected to an external acid liquid supply device is provided in the first upper filling cylinder (5), and the first lower recovery cylinder (6) is connected to an acid liquid recovery pipe (29); an anti-corrosion paint filling pipe (31) connected to an external anti-corrosion paint supply device is provided in the second upper filling cylinder (7), and the second lower recovery cylinder (8) is connected to an anti-corrosion paint recovery pipe (33).

2. The inner wall anti-corrosion treatment device for carbon steel square tube according to claim 1 is characterized in that: The first upper filling cylinder (5) is provided with a clean water filling pipe (22) and a first exhaust pipe (23) which are connected to an external clean water supply device, and the first lower recovery cylinder (6) is provided with a first hot air filling pipe (30); the second lower recovery cylinder (8) is provided with a second hot air filling pipe (34), and the second upper filling cylinder (7) is connected to a second exhaust pipe (32).

3. The inner wall anti-corrosion treatment device for carbon steel square tube according to claim 1, characterized in that: The clamping cylinder (4) comprises a mounting plate (16) which is rotatably connected to the rotating frame (2) and has a hollow structure. A plug-in cylinder (17) which is slidably connected to the mounting plate (16) is sleeved on the inner side of the mounting plate (16). The plug-in cylinder (17) is connected to a first electric telescopic rod (18) mounted on the inner end surface of the mounting plate (16). A connecting cylinder (19) is provided on the outer side of the mounting plate (16). The connecting cylinder (19) is connected to a second electric telescopic rod (20) mounted on the outer end surface of the mounting plate (16). The opposite tube body (3) is clamped and released by moving a pair of plug-in cylinders (17) on a pair of clamping cylinders (4) arranged opposite to each other in a direction opposite to or opposite to each other. The clamping cylinder (4) is connected to and disconnected from the first upper filling cylinder (5), the second upper filling cylinder (7), the first lower recovery cylinder (6) and the second lower recovery cylinder (8) by moving a connecting cylinder (19) arranged on the outer side of the clamping cylinder (4).

4. The inner wall anti-corrosion treatment device for carbon steel square tube according to claim 3 is characterized in that: The rotating frame (2) comprises a cylindrical portion (201) and disc portions (202) fixed on both sides of the cylindrical portion (201); the outer side of the disc portion (202) is rotatably connected to an upper fixing plate (9) and a lower fixing plate (10) via a pair of mounting shafts (14); and the mounting shaft (14) located at the lower side is connected to a first motor (15).

5. The inner wall anti-corrosion treatment device for carbon steel square tube according to claim 4, characterized in that: The mounting disc (16) is nested in the disc portion (202) and is rotatably connected to the disc portion (202). The mounting disc (16) comprises an inner disc (1601) and a rectangular tube (1602) penetrating the inner disc (1601). The plug-in tube (17) and the connecting tube (19) are respectively sleeved on both sides of the rectangular tube (1602).

6. The device for treating the inner wall of a carbon steel square tube according to claim 5, characterized in that: The plug-in cylinder (17) has a notch groove (1701) on its inner side, the connecting cylinder (19) has a cylindrical portion (1901) on its outer side, and the first upper filling cylinder (5), the first lower recovery cylinder (6), the second upper filling cylinder (7) and the second lower recovery cylinder (8) are all provided with an annular groove at their outer end openings for the cylindrical portion (1901) to be inserted into.

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