Intelligent steel pipe surface online passivating agent adding device capable of accurately controlling quantity

Abstract

The invention relates to the field of steel pipe surface treatment, and discloses an intelligent steel pipe surface online passivator adding device capable of accurately controlling quantity, which comprises a passivator storage box provided with a quantity control adding mechanism; the quantity-controlled adding mechanism comprises a bracket, a servo motor, a turntable, a bottom frame, a transverse plate, a driving motor, a screw rod, an L-shaped hole, a sealing plate I, a sealing plate II, a vertical plate, a connecting plate and a uniform mixing assembly; the support is fixedly installed on the passivating agent storage box, the servo motor is fixedly installed on the support, the output end of the servo motor is fixedly connected with the rotating disc, and the bottom frame is fixedly installed on the rotating disc. Compared with the prior art, the passivating agent storage device has the following advantages and effects that the dosage of passivating agents contained in the L-shaped holes is flexibly controlled, accurate control over the adding amount of the passivating agents is achieved, the problem that the passivating agents are prone to precipitation in the storage process is effectively solved, the uniformity and stability of the passivating agents are guaranteed, and the passivating agents can fully play a role.

Description

Technical Field

[0001] The present invention relates to the technical field of steel pipe surface treatment, and in particular to an online passivating agent adding device for steel pipe surface with intelligent and precise control. Background Art

[0002] During the steel pipe production process, passivation treatment is usually required to improve the corrosion resistance of the steel pipe. Passivation treatment uses chemical or electrochemical methods to form a dense and stable passivation film on the steel pipe surface. This passivation film can effectively isolate the steel pipe substrate from contact with external corrosive media, thereby significantly improving the corrosion resistance of the steel pipe.

[0003] At present, the existing methods of adding passivators to the surface of steel pipes mostly adopt manual addition or simple mechanical quantitative addition. The manual addition method is not only inefficient, but also difficult to ensure the accuracy and consistency of the addition amount, resulting in uneven passivation effects on the surface of steel pipes. The simple mechanical quantitative addition device, although improving the addition efficiency to a certain extent, is unable to adjust the addition amount of passivator in real time according to the actual production conditions of the steel pipe (such as production speed, steel pipe specifications, etc.), which easily leads to waste of passivator or insufficient addition, affecting the surface quality and corrosion resistance of the steel pipe. Moreover, the passivator is mostly stored directly in the storage tank, which is prone to precipitation and affects the use effect.

[0004] Therefore, it is necessary to design an intelligent and precise online passivation agent adding device for steel pipe surface to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to provide an intelligent and precise amount-controlled online passivation agent adding device for steel pipe surface to solve the above problems.

[0006] The above technical objectives of the present invention are achieved through the following technical solutions: an intelligent and precise controllable online passivation agent adding device for steel pipe surface, comprising:

[0007] A passivation agent storage box, wherein the passivation agent storage box is provided with a quantity control and addition mechanism;

[0008] The controlled addition mechanism includes a bracket, a servo motor, a turntable, a bottom frame, a horizontal plate, a drive motor, a screw rod, an L-shaped hole, a sealing plate 1, a sealing plate 2, a vertical plate, a connecting plate and a mixing component;

[0009] The bracket is fixedly mounted on the passivation agent storage box, the servo motor is fixedly mounted on the bracket, the output end of the servo motor is fixedly connected to the turntable, the bottom frame is fixedly mounted on the turntable, the cross plate is fixedly mounted inside the bottom frame, the drive motor is fixedly mounted on the bottom of the cross plate, the output end of the drive motor is fixedly connected to the screw rod, the L-shaped hole is opened on the turntable, the sealing plate 1 and the sealing plate 2 are both slidingly sealed and mounted in the L-shaped hole, the top of the vertical plate is fixedly connected to the sealing plate 2, the bottom of the vertical plate is fixedly connected to the connecting plate, and the screw rod is threadedly connected to the connecting plate.

[0010] The present invention is further configured as follows: the mixing component includes an extrusion groove, a side plate, a piston rod, an extrusion head, a sleeve disc, a spring, an air bag, an air intake pipe, a catheter 1, a one-way valve 1, a catheter 2 and a one-way valve 2; the extrusion groove is opened on the outer side of the turntable; the side plate is fixedly connected to the passivation agent storage box; the piston rod is slidably mounted on the side plate; the extrusion head is fixedly mounted on the bottom of the piston rod; the sleeve disc is fixedly sleeved on the outer side of the piston rod; the spring is fixedly mounted between the sleeve disc and the side plate; the air bag is fixedly mounted on the side of the passivation agent storage box; the air intake pipe is fixedly mounted on the air bag; the piston rod sliding seal is mounted on the air intake pipe; the catheter 1 and the catheter 2 are fixedly mounted on the piston rod and the air intake pipe respectively; the one-way valve 1 and the one-way valve 2 are respectively mounted on the catheter 1 and the catheter 2.

[0011] The present invention is further configured as follows: the mixing component also includes an air outlet pipe and a solenoid valve, the air outlet pipe is fixedly mounted on the airbag and the passivation agent storage box, the solenoid valve is mounted on the air outlet pipe, an opening is provided at the top of the piston rod, the conduit 1 is connected to the inside of the opening, and a one-way valve 3 is installed inside the air inlet pipe.

[0012] The present invention is further configured as follows: a stabilizing block is fixedly connected to the air intake pipe, and the stabilizing block is fixedly connected to the passivating agent storage box.

[0013] The present invention is further configured as follows: the L-shaped hole is filled with hydraulic oil located between the first sealing plate and the second sealing plate.

[0014] The present invention is further configured as follows: an addition pipe is fixedly connected to the top of the passivating agent storage box.

[0015] The present invention is further configured as follows: a mounting bracket is fixedly connected to the top of the passivating agent storage box, and a mounting hole is provided on the mounting bracket.

[0016] The present invention is further configured as follows: a discharge hole is provided at the bottom of the passivating agent storage box, and the turntable is in sealing contact with the discharge hole.

[0017] The present invention is further configured as follows: a movable hole is provided on the top of the side plate, and the piston rod is slidably installed in the movable hole.

[0018] The present invention is further configured as follows: the passivator storage box contains the passivator, and the air outlet pipe extends to the interior of the passivator storage box.

[0019] The beneficial effects of the present invention are:

[0020] 1. The present invention provides a controlled addition mechanism, which drives the screw to rotate through a driving motor, thereby accurately adjusting the positions of the first and second sealing plates in the L-shaped hole, and can flexibly control the amount of passivation contained in the L-shaped hole, thereby achieving precise control of the amount of passivation agent added. Compared with traditional manual addition or simple mechanical quantitative addition, the present invention solves the problems of low efficiency, poor accuracy and consistency of manual addition, and the inability of simple mechanical devices to adjust the addition amount in real time according to actual production conditions, thereby ensuring a uniform and stable passivation effect on the surface of the steel pipe and improving the surface quality and corrosion resistance of the steel pipe. The amount of passivation agent added can be changed in real time by adjusting the position of the sealing plate according to the actual production conditions of the steel pipe (such as production speed, steel pipe specifications, etc.), thereby avoiding waste or insufficient addition of passivation agent, improving the use efficiency of the passivation agent, and reducing production costs.

[0021] 2. The present invention, through the provision of a controlled amount addition mechanism, utilizes the extrusion effect of the extrusion groove on the extrusion head when the turntable rotates, and cleverly converts the rotational kinetic energy of the turntable into the up and down movement of the piston rod, thereby realizing the suction of external air and the expansion of the airbag, and then injects the air in the airbag into the passivator storage box by opening the solenoid valve to automatically mix the passivator. This design does not require an additional power source and a complex stirring mechanism, has a simple structure, and low energy consumption. It effectively solves the problem of easy precipitation of the passivator during storage, ensures the uniformity and stability of the passivator, enables it to fully play its role, and further improves the effect and quality of the passivation treatment of the steel pipe surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 This is a schematic diagram of the structure of an intelligent and precise control device for adding passivating agent to the surface of a steel pipe. Figure 1 .

[0024] Figure 2 This is a schematic diagram of the structure of an intelligent and precise control device for adding passivating agent to the surface of a steel pipe. Figure 2 .

[0025] Figure 3 This is a schematic diagram of the cross-sectional structure of an intelligent and precise control device for adding passivating agent to the surface of a steel pipe. Figure 1 .

[0026] Figure 4 This is a schematic diagram of the cross-sectional structure of an intelligent and precise control device for adding passivating agent to the surface of a steel pipe. Figure 2 .

[0027] Figure 5 yes Figure 1 Schematic diagram of the structure of part A in .

[0028] Figure 6 yes Figure 2 Schematic diagram of the structure of part B.

[0029] Figure 7 yes Figure 3 Schematic diagram of the structure of part C in .

[0030] Figure 8 yes Figure 4 Schematic diagram of the structure of part D in .

[0031] In the figure, 1. passivation agent storage box; 2. bracket; 3. servo motor; 4. turntable; 5. bottom frame; 6. horizontal plate; 7. drive motor; 8. screw; 9. L-shaped hole; 10. sealing plate 1; 11. sealing plate 2; 12. vertical plate; 13. connecting plate; 14. extrusion groove; 15. side plate; 16. piston rod; 17. extrusion head; 18. sleeve; 19. spring; 20. air bag; 21. air inlet pipe; 22. stabilizer block; 23. catheter 1; 24. one-way valve 1; 25. catheter 2; 26. one-way valve 2; 27. adding pipe; 28. mounting bracket; 29. ​​outlet pipe; 30. solenoid valve. DETAILED DESCRIPTION

[0032] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" 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 an indirect connection through an intermediate medium, or it can be internal communication between two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood based on specific circumstances.

[0033] The technical solutions of the present invention will be described clearly and completely below with reference to specific embodiments. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are also within the scope of protection of the present invention.

[0034] See also Figures 1-8 The present invention provides an intelligent and precise controllable online passivation agent adding device for steel pipe surface, comprising:

[0035] A passivation agent storage box 1 is provided with a quantity control and addition mechanism;

[0036] The controlled adding mechanism includes a bracket 2, a servo motor 3, a turntable 4, a bottom frame 5, a horizontal plate 6, a drive motor 7, a screw rod 8, an L-shaped hole 9, a sealing plate 10, a sealing plate 2 11, a vertical plate 12, a connecting plate 13 and a mixing component;

[0037] The bracket 2 is fixedly mounted on the passivation agent storage box 1, the servo motor 3 is fixedly mounted on the bracket 2, the output end of the servo motor 3 is fixedly connected to the turntable 4, the bottom frame 5 is fixedly mounted on the turntable 4, the cross plate 6 is fixedly mounted inside the bottom frame 5, the drive motor 7 is fixedly mounted on the bottom of the cross plate 6, the output end of the drive motor 7 is fixedly connected to the screw rod 8, the L-shaped hole 9 is opened on the turntable 4, the sealing plate 10 and the sealing plate 2 11 are both slidably sealed and installed in the L-shaped hole 9, the top of the vertical plate 12 is fixedly connected to the sealing plate 2 11, the bottom of the vertical plate 12 is fixedly connected to the connecting plate 13, and the screw rod 8 is threadedly connected to the connecting plate 13.

[0038] Through the above structure, the drive motor 7 is started to make the connecting plate 13 move vertically, the connecting plate 13 drives the vertical plate 12 to move, the vertical plate 12 drives the sealing plate 2 11 to move, and the sealing plate 2 11 drives the sealing plate 10 to move through the hydraulic oil, so that the position of the sealing plate 10 can be adjusted, and the passivator can be added in a controlled manner. The servo motor 3 is started, and the servo motor 3 drives the turntable 4 to rotate. When the L-shaped hole 9 is connected to the discharge hole on the passivator storage box 1, the passivator will enter the L-shaped hole 9 at this time, and then the turntable 4 continues to rotate, so that the L-shaped hole 9 is separated from the passivator storage box 1. At this time, the passivator in the L-shaped hole 9 is discharged and added, and the passivator will also enter the interior of the extrusion groove 14, which is also calculated.

[0039] By driving the screw rod 8 to rotate through the driving motor 7 and utilizing the threaded connection between the screw rod 8 and the connecting plate 13, the vertical movement of the connecting plate 13 can be accurately controlled. Then the vertical plate 12 drives the sealing plate 2 11 to move, and the sealing plate 2 11 drives the sealing plate 10 to move through the hydraulic oil in the L-shaped hole 9, changing the distance between the two sealing plates, and accurately adjusting the size of the space that can accommodate the passivator in the L-shaped hole 9. Compared with the traditional manual addition or simple mechanical quantitative addition method, it can effectively avoid the inaccurate and unstable addition amount caused by human factors or fixed mechanical structure, ensure the consistency and reliability of the passivation effect on the surface of the steel pipe, and improve the corrosion resistance of the steel pipe. The amount of passivator added can be adjusted in real time according to the actual production situation of the steel pipe (such as production speed, steel pipe specifications, etc.). When the production conditions change, the position of the sealing plate can be quickly adjusted by controlling the operation of the driving motor 7, and the capacity of the L-shaped hole 9 can be changed to match the amount of passivator added, thereby avoiding waste or insufficient addition of passivator, improving the efficiency of production resource utilization, reducing production costs, and enhancing the flexibility and adaptability of the production process.

[0040] The combination of a controlled addition mechanism and a mixing assembly not only achieves precise controlled addition, but also provides power to the mixing assembly through the interaction between the extrusion groove 14 and the extrusion head 17 as the turntable 4 rotates, achieving automatic mixing of the passivating agent. This integrated design further improves the device's functionality, further ensuring the effectiveness of the passivating agent and enhancing the surface treatment quality of steel pipes. It also simplifies the device structure, eliminating additional power devices and complex connections, reducing equipment costs and maintenance difficulties.

[0041] Specifically, the mixing assembly includes an extrusion groove 14, a side plate 15, a piston rod 16, an extrusion head 17, a sleeve disc 18, a spring 19, an airbag 20, an air inlet pipe 21, a conduit 1 23, a one-way valve 1 24, a conduit 2 25 and a one-way valve 2 26. The extrusion groove 14 is opened on the outer side of the turntable 4, the side plate 15 is fixedly connected to the passivator storage box 1, the piston rod 16 is slidably mounted on the side plate 15, the extrusion head 17 is fixedly mounted on the bottom of the piston rod 16, the sleeve disc 18 is fixedly sleeved on the outer side of the piston rod 16, the spring 19 is fixedly mounted between the sleeve disc 18 and the side plate 15, the airbag 20 is fixedly mounted on the side of the passivator storage box 1, the air inlet pipe 21 is fixedly mounted on the airbag 20, the piston rod 16 is slidingly sealed and mounted on the air inlet pipe 21, the conduit 1 23 and the conduit 2 25 are respectively fixedly mounted on the piston rod 16 and the air inlet pipe 21, the one-way valve 1 24 and the one-way valve 2 26 are respectively mounted on the conduit 1 23 and the conduit 2 25.

[0042] Through the above structure, the turntable 4 will drive the extrusion groove 14 to rotate during the rotation, and the extrusion groove 14 will squeeze the extrusion head 17, so that the piston rod 16 can move up, and the sleeve 18 can stretch the spring 19, so that the outside air can enter through the conduit 1 23 and the conduit 2 25, and then enter the airbag 20 through the one-way valve 3, so that the airbag 20 slowly expands.

[0043] Specifically, the mixing component also includes an air outlet pipe 29 and a solenoid valve 30. The air outlet pipe 29 is fixedly installed on the airbag 20 and the passivation agent storage box 1. The solenoid valve 30 is installed on the air outlet pipe 29. An opening is opened at the top of the piston rod 16. The conduit 1 23 is connected to the inside of the opening. A one-way valve 3 is installed inside the air inlet pipe 21.

[0044] Through the above structure, after the airbag 20 expands to a certain extent, the solenoid valve 30 is opened, so that the air in the airbag 20 can enter the passivator in the passivator storage box 1 through the air outlet pipe 29, so that the passivator in the passivator storage box 1 is mixed, thereby ensuring the use effect of the passivator.

[0045] Specifically, a stabilizing block 22 is fixedly connected to the air intake pipe 21, and the stabilizing block 22 is fixedly connected to the passivator storage box 1. A movable hole is opened on the top of the side panel 15, and the piston rod 16 is slidably installed in the movable hole. It should be noted that the piston rod 16 can move stably in the vertical direction. These structures ensure that the piston rod 16 can move stably in the vertical direction, avoid shaking during the movement, and ensure the stability and reliability of the mixing component.

[0046] Specifically, the L-shaped hole 9 is filled with hydraulic oil located between the sealing plate 10 and the sealing plate 2 11. It should be noted that when the sealing plate 10 moves, the sealing plate 2 11 is driven to move by the hydraulic oil, thereby ensuring the coordination and consistency of the movement of the two sealing plates, thereby more accurately controlling the storage amount of the passivator in the L-shaped hole 9 and realizing precise control of the addition.

[0047] Specifically, an addition pipe 27 is fixedly connected to the top of the passivator storage box 1, and a mounting bracket 28 is fixedly connected to the top of the passivator storage box 1. A mounting hole is provided on the mounting bracket 28, and a discharge hole is provided at the bottom of the passivator storage box 1. The turntable 4 is in sealing contact with the discharge hole. It should be noted that the mounting bracket 28 is fixed at a specified position by bolts to ensure the stability of the device during operation, so that it can continuously and reliably provide passivant for the passivation treatment of the steel pipe surface.

[0048] Specifically, the passivator storage box 1 stores the passivator, and the air outlet pipe 29 extends into the interior of the passivator storage box 1. It should be noted that the passivator is mixed by blowing air.

[0049] Working principle:

[0050] Start the drive motor 7, and the output end of the drive motor 7 drives the screw rod 8 to rotate. Since the screw rod 8 is threadedly connected to the connecting plate 13, according to the principle of thread transmission, the connecting plate 13 will move vertically, and the connecting plate 13 drives the vertical plate 12 to move, and the vertical plate 12 drives the sealing plate 2 11 to move. The sealing plate 2 11 drives the sealing plate 10 to move through the hydraulic oil filled in the L-shaped hole 9, thereby adjusting the position of the sealing plate 10 and achieving the purpose of controlling the amount of passivating agent added;

[0051] The servo motor 3 is started, and the output end of the servo motor 3 drives the turntable 4 to rotate. When the L-shaped hole 9 on the turntable 4 is connected to the discharge hole on the passivation agent storage box 1, the passivation agent in the passivation agent storage box 1 will enter the L-shaped hole 9 under the action of gravity; then the turntable 4 continues to rotate, so that the L-shaped hole 9 is separated from the passivation agent storage box 1. At this time, the passivation agent in the L-shaped hole 9 is discharged through the lower opening and added to the steel pipe surface treatment process. At the same time, during the rotation of the turntable 4, the passivation agent will also enter the interior of the extrusion groove 14. This part of the passivation agent is also included in the calculation range of each addition amount;

[0052] As the turntable 4 rotates, it drives the extrusion groove 14 to rotate. When the extrusion groove 14 rotates to contact the extrusion head 17, it squeezes the extrusion head 17, causing the piston rod 16 to move upward, overcoming the tension of the spring 19. The sleeve 18 stretches the spring 19 as the piston rod 16 moves upward. At this time, since the piston rod 16 slides and seals in the intake pipe 21, and the intake pipe 21 is equipped with a one-way valve 3, the outside air can only pass through the conduit 1 23 and the conduit 2 25. Under the action of the one-way valve 1 24 and the one-way valve 2 26, the outside air passes through the conduit 1 23, the top opening of the piston rod 16, and the intake pipe 21 in sequence and enters the airbag 20, causing the airbag 20 to slowly expand.

[0053] When the airbag 20 expands to a certain extent, the solenoid valve 30 is opened. At this time, the air in the airbag 20 enters the passivator in the passivator storage box 1 through the air outlet pipe 29 under the action of pressure. The air generates bubbles and airflow in the passivator, stirring the passivator, thereby achieving uniform mixing of the passivator in the passivator storage box 1, ensuring the use effect of the passivator, and avoiding problems such as passivator precipitation that affect the quality of the passivation treatment on the surface of the steel pipe.

[0054] The above is a detailed introduction to the intelligent, precise, and controlled online passivation agent addition device for steel pipe surfaces provided by the present invention. Specific embodiments are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only intended to help understand the method and core concept of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications may be made to the present invention without departing from the principles of the present invention, and such improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. An intelligent and precise control device for adding passivating agent to the surface of a steel pipe, characterized in that: include: A passivation agent storage box (1), wherein the passivation agent storage box (1) is provided with a quantity control and addition mechanism; The controlled addition mechanism comprises a bracket (2), a servo motor (3), a turntable (4), a bottom frame (5), a horizontal plate (6), a driving motor (7), a screw rod (8), an L-shaped hole (9), a sealing plate 1 (10), a sealing plate 2 (11), a vertical plate (12), a connecting plate (13) and a mixing assembly; The bracket (2) is fixedly mounted on the passivation agent storage box (1), the servo motor (3) is fixedly mounted on the bracket (2), the output end of the servo motor (3) is fixedly connected to the turntable (4), the bottom frame (5) is fixedly mounted on the turntable (4), the transverse plate (6) is fixedly mounted inside the bottom frame (5), the drive motor (7) is fixedly mounted on the bottom of the transverse plate (6), the output end of the drive motor (7) is fixedly connected to the screw rod (8), the L-shaped hole (9) is opened on the turntable (4), the sealing plate 1 (10) and the sealing plate 2 (11) are both slidingly sealed and mounted in the L-shaped hole (9), the top of the vertical plate (12) is fixedly connected to the sealing plate 2 (11), the bottom of the vertical plate (12) is fixedly connected to the connecting plate (13), and the screw rod (8) is threadedly connected to the connecting plate (13).

2. The intelligent and precise controllable online passivation agent adding device for steel pipe surface according to claim 1 is characterized in that: The mixing assembly comprises an extrusion groove (14), a side plate (15), a piston rod (16), an extrusion head (17), a sleeve disc (18), a spring (19), an air bag (20), an air inlet pipe (21), a first conduit (23), a first one-way valve (24), a second conduit (25) and a second one-way valve (26), wherein the extrusion groove (14) is provided on the outer side of the turntable (4), the side plate (15) is fixedly connected to the passivation agent storage box (1), the piston rod (16) is slidably mounted on the side plate (15), the extrusion head (17) is fixedly mounted on the bottom of the piston rod (16), the sleeve disc (18) is provided with a plurality of air bags, wherein the air bags are ... ) is fixedly sleeved on the outside of the piston rod (16), the spring (19) is fixedly mounted between the sleeve disc (18) and the side plate (15), the air bag (20) is fixedly mounted on the side of the passivation agent storage box (1), the air intake pipe (21) is fixedly mounted on the air bag (20), the piston rod (16) is slidingly sealed and mounted on the air intake pipe (21), the conduit 1 (23) and the conduit 2 (25) are respectively fixedly mounted on the piston rod (16) and the air intake pipe (21), and the one-way valve 1 (24) and the one-way valve 2 (26) are respectively mounted on the conduit 1 (23) and the conduit 2 (25).

3. The intelligent and precise controllable online passivation agent adding device for steel pipe surface according to claim 2 is characterized in that: The mixing assembly further comprises an air outlet pipe (29) and a solenoid valve (30), wherein the air outlet pipe (29) is fixedly mounted on the air bag (20) and the passivation agent storage box (1), and the solenoid valve (30) is mounted on the air outlet pipe (29). An opening is provided at the top of the piston rod (16), and the conduit 1 (23) is connected to the inside of the opening. A one-way valve 3 is mounted inside the air inlet pipe (21).

4. The intelligent and precise controllable online passivation agent adding device for steel pipe surface according to claim 2 is characterized in that: A stabilizing block (22) is fixedly connected to the air inlet pipe (21), and the stabilizing block (22) is fixedly connected to the passivating agent storage box (1).

5. The intelligent and precise controllable online passivation agent adding device for steel pipe surface according to claim 1 is characterized in that: The L-shaped hole (9) is filled with hydraulic oil located between the sealing plate 1 (10) and the sealing plate 2 (11).

6. The intelligent and precise controllable online passivation agent adding device for steel pipe surface according to claim 1 is characterized in that: The top of the passivating agent storage box (1) is fixedly connected with an addition pipe (27).

7. The intelligent and precise controllable online passivation agent adding device for steel pipe surface according to claim 1 is characterized in that: The top of the passivating agent storage box (1) is fixedly connected with a mounting frame (28), and a mounting hole is provided on the mounting frame (28).

8. The intelligent and precise controllable online passivation agent adding device for steel pipe surface according to claim 1 is characterized in that: A discharge hole is provided at the bottom of the passivating agent storage box (1), and the rotating disk (4) is in sealing contact with the discharge hole.

9. The intelligent and precise controllable online passivation agent adding device for steel pipe surface according to claim 2 is characterized in that: A moving hole is provided on the top of the side plate (15), and the piston rod (16) is slidably installed in the moving hole.

10. The intelligent and precise controllable online passivation agent adding device for steel pipe surface according to claim 3 is characterized in that: The passivating agent storage box (1) stores a passivating agent therein, and the air outlet pipe (29) extends to the interior of the passivating agent storage box (1).

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