A processing apparatus and a processing method for a corrosion-resistant seamless steel pipe

Abstract

This invention discloses a processing equipment and method for corrosion-resistant seamless steel pipes. It includes: a frame, on which a lifting plate is mounted, the lifting plate and the frame being vertically movably connected; a gravity block is mounted on the bottom surface of the lifting plate; a movable top plate is mounted below the lifting plate, the movable top plate and the lifting plate being vertically movably connected; a steel pipe placement seat is mounted on the top surface of the movable top plate, the steel pipe placement seat being located directly below the gravity block and the two being arranged opposite each other; and a immersion coating tank located below the movable top plate. The beneficial effect of this invention is that it can effectively protect the seamless steel pipe.

Description

Technical Field

[0001] This invention relates to the technical field of seamless steel pipe processing, and in particular to a processing equipment and method for corrosion-resistant seamless steel pipes. Background Technology

[0002] Seamless steel pipes, with their excellent mechanical properties, good sealing performance, and corrosion resistance potential, are widely used in many fields such as petrochemicals, municipal pipe networks, engineering machinery, and aerospace. Especially in the context of transporting corrosive media, structural support, or fluid transmission under harsh working conditions, the corrosion resistance of seamless steel pipes directly determines the safety, stability, and service life of equipment operation. Therefore, efficient and uniform corrosion-resistant treatment of seamless steel pipes is one of the key processes in their production and processing. By forming a dense and firm corrosion-resistant film layer on the inner and outer walls of the steel pipe, the steel pipe's resistance to corrosive substances such as acids, alkalis, and salts can be significantly improved, extending its service life.

[0003] However, existing seamless steel pipe corrosion-resistant processing equipment still has many shortcomings in the clamping and dipping stages: traditional clamping mechanisms mostly adopt rigid locking structures, and the steel pipe is fixed by additional locking components such as bolts and clamps. This is not only cumbersome and inefficient, but also difficult to control the clamping force precisely, which can easily cause bumps and indentations on the end face of the steel pipe, and even lead to plastic deformation of the pipe wall, damaging the integrity of the steel pipe substrate.

[0004] In summary, there is a need for processing equipment and methods that can effectively protect seamless steel pipes from corrosion. Summary of the Invention

[0005] The present invention aims to overcome the shortcomings of the prior art by providing a processing equipment and method for corrosion-resistant seamless steel pipes that can effectively protect seamless steel pipes.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A processing device for corrosion-resistant seamless steel pipes, comprising: A frame is provided with a lifting plate, which is movably connected to the frame. A gravity block is provided on the bottom surface of the lifting plate. A movable top plate is provided below the lifting plate, which is movably connected to the lifting plate. A steel pipe placement seat is provided on the top surface of the movable top plate, which is located directly below the gravity block and the two are arranged opposite to each other. An immersion coating tank is located below a movable top plate.

[0007] During operation, the seamless steel pipe is placed vertically on the pipe placement seat of the movable top plate. The movable top plate moves upward relative to the lifting plate, causing the steel pipe to move upward synchronously, forming a vertical clamping action with the gravity block on the bottom of the lifting plate. The steel pipe is stably positioned using the combined force of the gravity block's own weight and the upward force of the movable top plate, eliminating the need for additional locking components. After clamping, the lifting plate and movable top plate move downward relative to the frame, allowing the vertically arranged seamless steel pipe to be fully immersed in the coating tank below for corrosion-resistant film immersion coating. The movable top plate uses a vertical clamping method with upward pushing from the bottom. The controllable upward stroke of the movable top plate, combined with the self-weight pressure of the gravity block, forms a flexible limiting clamping force. The clamping force is stable and controllable, avoiding rigid compression and impact. It can adapt the appropriate clamping degree according to the steel pipe specifications, fundamentally preventing impacts, indentations, and deformation of the pipe end face caused by rigid pressure, effectively protecting the integrity of the steel pipe substrate surface.

[0008] Preferably, the steel pipe placement seat includes a chassis mounted on a movable top plate. A first limiting clamp is fixed on the chassis, and an extension is provided at the bottom end of the gravity top block. A second limiting clamp is fixed on the extension, and the second limiting clamp is located directly above the first limiting clamp. Both the first and second limiting clamps are bowl-shaped, and their openings are arranged opposite each other. The first and second limiting clamps are arranged in a bowl-shaped structure with their openings facing each other, which can center and clamp the vertically placed seamless steel pipe at both ends and limit its movement in all directions. This automatically corrects the vertical position of the steel pipe, disperses the clamping contact stress, prevents pressure damage to the end face of the steel pipe, ensures the stable and upright posture of the steel pipe during the dipping and coating operation, and allows all parts of the steel pipe to fully and evenly contact the anti-corrosion coating, effectively improving the integrity and uniformity of the corrosion-resistant film.

[0009] Preferably, the outer edge of the first limiting clamp is fixed to the chassis by a first reinforcing rib, and the outer edge of the second limiting clamp and the extension are fixed by a second reinforcing rib. By reinforcing the connection between the first limiting clamp and the chassis, and between the second limiting clamp and the extension, the structural strength, overall rigidity, and connection firmness of the two sets of bowl-shaped limiting clamps can be effectively improved. This disperses the clamping force and the load stress under immersion coating conditions, prevents the clamps from deforming, cracking, or loosening and falling off due to long-term pressure, enhances the structural stability and durability of the equipment during long-term operation, ensures the continuous and reliable clamping and limiting accuracy of the steel pipe, and provides a solid structural foundation for stable immersion coating operations and uniform film formation.

[0010] Preferably, the sidewall of the first limiting clamp has several sets of through holes, which are axially arranged along the central axis of the first limiting clamp. Each set of through holes contains several through holes, and the through holes in the same set are evenly distributed circumferentially with the central axis of the first limiting clamp as the center. The axial arrangement of multiple sets of evenly distributed circumferential through holes on the sidewall of the first limiting clamp allows the anti-corrosion liquid to flow smoothly into the steel pipe during immersion, ensuring that the inner wall of the steel pipe is fully wetted and forms a film. It also allows the residual liquid inside the clamp to be quickly discharged after the steel pipe is lifted out of the pool, preventing the anti-corrosion liquid from accumulating and flowing locally, thereby reducing paint waste, avoiding the defect of uneven coating thickness, and ensuring the uniform and stable overall coating quality of the seamless steel pipe.

[0011] Preferably, the chassis is provided with a plurality of steel pipe limiting rods, which are arranged circumferentially around the central axis of the first limiting clamping block. Each steel pipe limiting rod corresponds to a through hole in a corresponding through hole group, and the steel pipe limiting rod and the through hole are slidably connected vertically. The plurality of steel pipe limiting rods arranged circumferentially around the central axis of the first limiting clamping block, and corresponding to the through holes, and slidably connected vertically, can form a uniform circumferential limiting constraint on the outer periphery of the seamless steel pipe during vertical clamping, effectively limiting radial swaying and displacement of the steel pipe, continuously maintaining the regularity and stability of the vertical clamping posture of the steel pipe, preventing the steel pipe from tilting or misaligning under force, and ensuring the clamping alignment accuracy of the upper and lower clamping blocks.

[0012] Preferably, the steel pipe placement base further includes a base column and a bottom column. The base column is fixed to the top surface of the movable top plate. The lower end face of the bottom column is provided with a base column groove that matches the base column. The bottom column is fitted onto the base column through the base column groove and is slidably connected to it vertically. A first spring is provided between the bottom surface of the base column groove and the end face of the base column. The base plate is fixed to the upper end face of the bottom column. The steel pipe limiting rod is arranged circumferentially on the outside of the bottom column. The base plate is provided with a limiting rod through hole that matches the steel pipe limiting rod. The top end of the steel pipe limiting rod passes through the limiting rod through hole and a side locking block is fixed thereon. The steel pipe limiting rod and the limiting rod... The bottom column is slidably connected with the perforated structure. A movable ring is sleeved on the outer side of the bottom column, and the movable ring and the bottom column are slidably connected. The bottom end of the steel pipe limiting rod is fixed on the movable ring. A second spring is provided between the movable ring and the base. A pin groove is provided on the inner ring wall of the movable ring. A magnetic pin is slidably connected inside the pin groove. A third spring is provided between the bottom surface of the pin groove and the end face of the magnetic pin. A pin positioning hole matching the magnetic pin is provided on the side wall of the bottom column. A magnetic terminal matching the magnetic pin is fixed on the side wall of the base column. The magnetic pin and the magnetic terminal repel each other. In its natural state, the magnetic pin is inserted into the pin positioning hole of the bottom column under the action of the third spring, so that the movable ring and the steel pipe limiting rod are locked. At this time, the magnetic pin and the magnetic terminal are misaligned. The upper end of the steel pipe limiting rod passes through the limiting rod through hole and extends into the first limiting clamping block. It can pre-limit the seamless steel pipe during the placement stage to ensure accurate placement of the steel pipe. When the seamless steel pipe is placed on the first limiting clamping block, the first spring is in a natural state without obvious deformation. When the movable top plate moves upward to complete the steel pipe clamping operation, the base column slides upward relative to the base column groove and compresses the first spring. When the magnetic terminal moves with the base column to the position directly opposite the pin positioning hole, the repulsive force between the magnetic terminal and the magnetic pin overcomes the spring force of the third spring, causing the magnetic pin to retract and disengage from the pin positioning hole, releasing the locking restriction between the movable ring and the steel pipe limiting rod. The movable ring and the steel pipe limiting rod move downward synchronously under the spring force of the second spring, causing the steel pipe limiting rod to exit from the through hole of the first limiting clamp, thereby eliminating the area obstructed by the steel pipe limiting rod on the seamless steel pipe, completely avoiding the immersion blind spot caused by the steel pipe limiting rod, and ensuring that the anti-corrosion liquid can smoothly pass through the through hole and fully contact the end and inner wall of the steel pipe. The multi-level elastic structure can buffer the mechanical impact during the clamping and lifting process, adapt to the vertical clamping operation requirements, effectively improve the comprehensiveness and uniformity of the seamless steel pipe immersion coating, and the overall structure is smoothly linked and highly automated. Limit switching can be completed without manual adjustment, making it convenient to use and highly practical for processing.

[0013] Preferably, a hot air blower base is fixed on the lifting plate, and a hot air blower installation channel is provided on the hot air blower base. A heating blower is fixed in the hot air blower installation channel. A drying chamber is fixed at the bottom of the hot air blower base. The hot air blower installation channel is located inside the drying chamber and the two are interconnected. The gravity top block is placed inside the drying chamber and is slidably connected to it. A circumferential retaining ring is fixed at the lower end of the drying chamber. The outer diameter of the steel pipe placement seat and the outer diameter of the second limiting clamp are both smaller than the inner diameter of the circumferential retaining ring. An air inlet is provided on the gravity top block. One end of the air inlet is located on the top surface of the gravity top block and is opposite to the hot air blower installation channel. The other end of the air inlet is located on the bottom surface of the second limiting clamp and is opposite to the first limiting clamp. After the seamless steel pipe is immersed in the liquid and lifted out of the immersion area, the movable top plate further increases the upward force. The pushing force overcomes the weight of the gravity top block, driving the gravity top block to slide upward along the drying tube cavity to avoid it. This pushes the seamless steel pipe, along with the entire steel pipe placement seat, completely into the drying tube cavity. The hot air generated by the heating fan is sequentially transported through the hot air fan installation channel and the air inlet of the gravity top block to the inner cavity of the steel pipe. Then, it diffuses outward through the through holes on the first limiting clamp at the bottom to the outside of the steel pipe, forming a through-flow air circulation from the inside to the outside. This can quickly and comprehensively blow away the residual anti-corrosion liquid on the inner and outer walls of the steel pipe, preventing liquid accumulation and flow, and accelerating the uniform drying and curing of the coating. The enclosed structure of the drying tube cavity locks in the hot air, reducing energy consumption. The moving parts cooperate smoothly without interference, effectively improving the overall drying uniformity of the steel pipe and the coating forming quality.

[0014] Preferably, one end of the air inlet duct is fixed with a connector that matches the hot air blower mounting channel. The connector and the hot air blower mounting channel are interlocked. An automatic start / stop switch is provided on the side of the heating blower facing the connector. The automatic start / stop switch adopts a micro-motion limit switch design. When the connector is inserted into place, it presses and touches the trigger switch to control the heating blower to start automatically. When it is separated, it stops automatically. When the movable top plate pushes the seamless steel pipe and the steel pipe placement seat into the drying chamber as a whole, and pushes the gravity top block upward, the spigot moves synchronously with the gravity top block and is inserted into the hot air fan installation channel. When it is inserted into place, it touches the trigger switch, which automatically turns on the heating fan. Hot air is directed into the inside of the steel pipe through the spigot and the air inlet, and then flows outward through the through hole of the first limit clamp. This achieves automatic start and stop and precise air guidance. No manual operation is required. The drying operation can be started immediately after the drying station is in place. The process linkage is close, which can not only ensure the sealing of the hot air connection and reduce air leakage, but also simplify operation, save energy, and improve the automation level and processing continuity of the equipment.

[0015] Preferably, the hot air blower base is also provided with an exhaust duct, which is located on the side of the hot air blower installation channel and inside the drying tube cavity, and the two are interconnected. The gravity top block is provided with an air outlet duct that matches the exhaust duct, which is located on the side of the air inlet duct. The air outlet duct and the exhaust duct are arranged opposite to each other. During the drying operation, hot air is sent into the steel pipe through the air inlet duct and diffuses outward through the through hole of the first limiting clamp. The humid and hot air after heat exchange can be collected through the air outlet duct and then discharged outward in a timely manner through the exhaust duct. This forms a complete airflow circulation from the inside to the outside and in an orderly manner inside the drying tube cavity, effectively avoiding the accumulation and retention of humid and hot air, accelerating the evaporation of residual anti-corrosion liquid, and preventing problems such as uneven drying and paint film sagging caused by moisture accumulation.

[0016] This invention also provides a method for processing corrosion-resistant seamless steel pipes, comprising the following steps: Step 1: Place the seamless steel pipe vertically on the steel pipe placement seat. Use the circumferentially arranged steel pipe limiting rods to pre-limit the outer circumference of the seamless steel pipe. Then, move the movable top plate up and use the weight of the gravity top block to clamp and fix the seamless steel pipe. Step 2: After clamping into place, the steel pipe limit rod automatically moves down and retracts to eliminate the blind spot. Then, it drives the whole structure to move down, so that the seamless steel pipe is completely immersed in the coating tank to complete the anti-corrosion liquid coating. Step 3: After the dip coating is completed, lift the seamless steel pipe out of the dip coating tank, and continue to lift the movable top plate to overcome the weight of the gravity top block and push the seamless steel pipe and the steel pipe placement seat into the drying chamber together. Step 4: After the air duct is connected, the heating fan will start automatically. Hot air is blown in from inside the steel pipe and discharged out through the bottom through hole. Together with the exhaust channel, a circulating air duct is formed to quickly dry the residual liquid on the surface of the seamless steel pipe and allow the anti-corrosion coating to cure and dry. Step 5: After drying, all structures are reset, the finished steel pipe is removed, and the process is repeated to achieve continuous processing.

[0017] The integrated process of pre-limiting and centering, self-weight clamping, automatic retraction of the limit rod to eliminate the immersion blind zone, overall immersion coating, lifting and automatic delivery into the drying chamber and triggering directional internal circulation hot air drying is compact and highly automated. It ensures that the seamless steel pipe is fully coated without dead corners and the coating is uniform. It can also quickly dry residual liquid and cure the anti-corrosion coating, avoiding paint accumulation and flow.

[0018] The beneficial effects of this invention are: it can effectively protect seamless steel pipes; effectively improve the integrity and coating uniformity of the corrosion-resistant film; enhance the structural stability and durability of the equipment during long-term operation, ensuring the continuous and reliable accuracy of the steel pipe clamping limit; prevent the steel pipe from tilting or misaligning under force, ensuring the clamping alignment accuracy of the upper and lower clamping blocks; the overall structure is smoothly linked and highly automated, requiring no manual adjustment to complete the limit switching, making it convenient to use and highly practical for processing; it can lock in hot air, reduce energy consumption, and the moving parts cooperate smoothly without interference, effectively improving the overall drying uniformity and coating quality of the steel pipe; it can ensure the sealing of the hot air connection, reduce airflow leakage, simplify operation, save energy, and improve the automation level and processing continuity of the equipment; it effectively avoids the accumulation and retention of humid and hot air, accelerates the evaporation of residual anti-corrosion liquid, and prevents problems such as uneven drying and paint film sagging caused by moisture accumulation. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the invention when it is not in operation; Figure 2 yes Figure 1 Schematic diagram of the internal structure of the steel pipe placement base; Figure 3 This is a schematic diagram of the structure of the present invention when clamping and fixing a seamless steel pipe; Figure 4 yes Figure 3 Enlarged view of point A in the middle; Figure 5 This is a schematic diagram of the structure of the present invention when seamless steel pipes are immersed in a coating bath; Figure 6 This is a schematic diagram of the structure of the present invention when the seamless steel pipe is lifted and removed from the immersion coating tank; Figure 7 This is a schematic diagram of the structure of the present invention during hot air drying of seamless steel pipes; Figure 8 yes Figure 7 Enlarged view of point B in the middle.

[0020] In the diagram: 1. Frame, 2. Lifting plate, 3. Gravity top block, 4. Movable top plate, 5. Chassis, 6. Dipping tank, 7. First limiting clamp, 8. Extension, 9. Second limiting clamp, 10. First reinforcing rib, 11. Second reinforcing rib, 12. Through hole, 13. Steel pipe limiting rod, 14. Base column, 15. Bottom column, 16. Base column groove, 17. First spring, 18. Limiting rod through hole, 19. Side clamp, 20. Movable ring, 21. Second spring, 22. Pin groove, 23. Magnetic pin, 24. Third spring, 25. Pin positioning hole, 26. Magnetic terminal, 27. Hot air blower base, 28. Hot air blower installation channel, 29. Heating blower, 30. Drying cavity, 31. Circumferential retaining ring, 32. 33. Air inlet duct, 34. Inlet nozzle, 35. Automatic start / stop switch, 36. Exhaust duct, 37. Air outlet duct. Detailed Implementation

[0021] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this application or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0022] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0023] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of components illustrated in these embodiments do not limit the scope of this application. For ease of illustration, spatial relative terms such as “upper,” “lower,” “left,” and “right” are used in the embodiments to describe the relationship of one element or feature shown in the figures relative to another element or feature. It should be understood that, in addition to the orientations shown in the figures, spatial terms are intended to include different orientations of the device in use or operation. For example, if the device in the figures is inverted, an element described as being “below” other elements or features would be fixed “upper” to other elements or features. Thus, the exemplary term “lower” can include both upper and lower orientations. The device may be fixed in other ways (rotated 90 degrees or located in other orientations), and the spatial relative descriptions used herein can be interpreted accordingly. It should also be understood that, for ease of description, the dimensions of the various parts shown in the figures are not drawn to actual scale. Techniques, processes, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, processes, and equipment should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limiting. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be discussed further in subsequent figures.

[0024] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this application.

[0025] like Figures 1-8 In the embodiments described above, a processing equipment for corrosion-resistant seamless steel pipes includes: A frame 1 is provided, and a lifting plate 2 is provided on the frame 1. The lifting plate 2 and the frame 1 are movably connected vertically. A gravity block 3 is provided on the bottom surface of the lifting plate 2. A movable top plate 4 is provided below the lifting plate 2. The movable top plate 4 and the lifting plate 2 are movably connected vertically. A steel pipe placement seat is provided on the top surface of the movable top plate 4. The steel pipe placement seat is located directly below the gravity block 3 and the two are arranged opposite to each other. Dipping tank 6 is located below movable top plate 4.

[0026] The steel pipe placement base includes a chassis 5 set on a movable top plate 4. A first limiting clamp 7 is fixed on the chassis 5. An extension 8 is provided at the bottom end of the gravity top block 3. A second limiting clamp 9 is fixed on the extension 8. The second limiting clamp 9 is located directly above the first limiting clamp 7. Both the first limiting clamp 7 and the second limiting clamp 9 are bowl-shaped and their openings are arranged opposite each other.

[0027] The outer edge of the first limiting clamp 7 is fixed to the chassis 5 by the first reinforcing rib 10, and the outer edge of the second limiting clamp 9 and the extension 8 are fixed by the second reinforcing rib 11.

[0028] The side wall of the first limiting clamp 7 is provided with several through hole groups. The through hole groups are arranged axially along the central axis of the first limiting clamp 7. Each through hole group contains several through holes 12. The through holes 12 in the same through hole group are evenly arranged circumferentially with the central axis of the first limiting clamp 7 as the center.

[0029] Several steel pipe limiting rods 13 are provided on the chassis 5. The steel pipe limiting rods 13 are arranged circumferentially around the central axis of the first limiting clamping block 7. The steel pipe limiting rods 13 correspond one-to-one with the through holes 12 of the corresponding through hole group, and the steel pipe limiting rods 13 and the through holes 12 are connected by sliding up and down.

[0030] The steel pipe placement base also includes a base column 14 and a bottom column 15. The base column 14 is fixed to the top surface of the movable top plate 4. The lower end face of the bottom column 15 is provided with a base column groove 16 that matches the base column 14. The bottom column 15 is fitted onto the base column 14 through the base column groove 16 and is slidably connected to it. A first spring 17 is provided between the bottom surface of the base column groove 16 and the end face of the base column 14. The base plate 5 is fixed to the upper end face of the bottom column 15. The steel pipe limiting rod 13 is arranged circumferentially on the outside of the bottom column 15. The base plate 5 is provided with a limiting rod through hole 18 that matches the steel pipe limiting rod 13. The top end of the steel pipe limiting rod 13 passes through the limiting rod through hole 18 and a side locking block 19 is fixed thereon. The steel pipe limiting rod 13 and the limiting rod through hole 18 are connected. The bottom column 15 is slidably connected to the base column 15. A movable ring 20 is sleeved on the outer side of the bottom column 15. The movable ring 20 and the bottom column 15 are slidably connected. The bottom end of the steel pipe limiting rod 13 is fixed on the movable ring 20. A second spring 21 is provided between the movable ring 20 and the base plate 5. A pin groove 22 is provided on the inner ring wall of the movable ring 20. A magnetic pin 23 is slidably connected inside the pin groove 22. A third spring 24 is provided between the bottom surface of the pin groove 22 and the end face of the magnetic pin 23. A pin positioning hole 25 matching the magnetic pin 23 is provided on the side wall of the bottom column 15. A magnetic terminal 26 matching the magnetic pin 23 is fixed on the side wall of the base column 14. The magnetic pin 23 and the magnetic terminal 26 repel each other.

[0031] A hot air blower base 27 is fixed on the lifting plate 2. A hot air blower installation channel 28 is provided on the hot air blower base 27. A heating fan 29 is fixed inside the hot air blower installation channel 28. A drying chamber 30 is fixed at the bottom of the hot air blower base 27. The hot air blower installation channel 28 is located inside the drying chamber 30 and the two are connected to each other. A gravity top block 3 is placed inside the drying chamber 30 and is slidably connected to it. A circumferential retaining ring 31 is fixed at the lower end of the drying chamber 30. The outer diameter of the steel pipe placement seat and the outer diameter of the second limiting clamp 9 are both smaller than the inner diameter of the circumferential retaining ring 31. An air inlet duct 32 is provided on the gravity top block 3. One end of the air inlet duct 32 is located on the top surface of the gravity top block 3 and is opposite to the hot air blower installation channel 28. The other end of the air inlet duct 32 is located on the bottom surface of the second limiting clamp 9 and is opposite to the first limiting clamp 7.

[0032] One end of the air inlet duct 32 is fixed with a plug part 33 that matches the hot air blower installation channel 28. The plug part 33 and the hot air blower installation channel 28 are plugged into each other. The heating fan 29 is provided with an automatic start / stop switch 34 on the side facing the plug part 33.

[0033] The hot air blower base 27 is also provided with an exhaust duct 35, which is located on the side of the hot air blower installation channel 28. The exhaust duct 35 is located inside the drying tube 30 and the two are connected to each other. The gravity top block 3 is provided with an air outlet duct 36 that matches the exhaust duct 35. The air outlet duct 36 is located on the side of the air inlet duct 32. The air outlet duct 36 and the exhaust duct 35 are arranged opposite to each other.

[0034] This invention also provides a method for processing corrosion-resistant seamless steel pipes, comprising the following steps: Step 1: Place the seamless steel pipe vertically on the steel pipe placement seat. Use the circumferentially arranged steel pipe limiting rods 13 to pre-limit the outer periphery of the seamless steel pipe. Move the movable top plate 4 upward and use the gravity top block 3 to clamp and fix the seamless steel pipe by its own weight. Step 2: After clamping into place, the steel pipe limiting rod 13 automatically moves down and retracts to eliminate the blind spot, and then drives the whole structure to move down so that the seamless steel pipe is completely immersed in the coating tank 6 to complete the anti-corrosion liquid coating. Step 3: After the dip coating is completed, lift the seamless steel pipe out of the dip coating tank 6, and the movable top plate 4 continues to push upward to overcome the weight of the gravity top block 3, and push the seamless steel pipe and the steel pipe placement seat into the drying tube cavity 30 together. Step 4: Hot air is blown in from inside the steel pipe and discharged outward through the bottom through hole 12, forming a circulating air duct with the exhaust channel 35 to quickly dry the residual liquid on the surface of the seamless steel pipe and allow the anti-corrosion coating to cure and dry. Step 5: After drying, all structures are reset, the finished steel pipe is removed, and the process is repeated to achieve continuous processing.

[0035] In the initial state of the equipment, the steel pipe limiting rod 13 remains locked and extends to the inside of the first limiting clamp 7. The seamless steel pipe to be processed is placed vertically on the first limiting clamp 7 of the steel pipe placement seat. The bottom of the steel pipe is supported against the bowl-shaped inner wall of the first limiting clamp 7. The circumferentially arranged steel pipe limiting rod 13 forms a confining constraint on the outer periphery of the steel pipe from the outside, completing the initial centering and pre-limiting, ensuring that the steel pipe is placed upright. In this placement state, the first spring 17 maintains a naturally extended state without significant deformation. Subsequently, the first cylinder is activated and drives the movable top plate 4 to move upward relative to the lifting plate 2, causing the seamless steel pipe to be vertically lifted, so that the upper and lower ends of the steel pipe are precisely aligned with the second limiting clamp 9 and the first limiting clamp 7, respectively. The upward force provided by the first cylinder, combined with the weight of the gravity top block 3, forms a flexible clamping and fixing, without the need for additional locking components.

[0036] During the clamping and fixing process, the first cylinder drives the movable top plate 4 to move continuously upward, and the base column 14, which is fixedly connected to the top surface of the movable top plate 4, moves upward synchronously. Meanwhile, the bottom column 15 remains relatively stationary due to the support of the seamless steel pipe and the first limiting clamp 7, allowing the base column 14 to overcome the elastic force of the first spring 17 and slide upward along the base column slide groove 16 at the bottom of the bottom column 15. As the base column 14 moves upward, the magnetic terminal 26 fixed on its side wall moves upward synchronously, gradually approaching the magnetic pin 23 in the pin slide groove 22 of the inner ring wall of the movable ring 20. When the movable top plate 4 moves the steel pipe to form a stable and flexible clamp with the gravity top block 3 and the second limiting clamp 9, the magnetic terminal 26 moves to the position directly opposite the pin positioning hole 25. At this time, the magnetic terminal 26 and the magnetic pin 23 generate a repulsive force of the same polarity. This repulsive force overcomes the pre-tightening force of the third spring 24 and pushes the magnetic pin 23 to retract inward along the pin groove 22, completely disengaging from the pin positioning hole 25 on the side wall of the bottom column 15, thus completely releasing the locking constraint between the movable ring 20 and the bottom column 15. After losing the locking constraint, the second spring 21, which is in a compressed state between the movable ring 20 and the chassis 5, releases its elastic potential energy and generates a downward reset thrust. The movable ring 20 and the steel pipe limiting rod 13 move down synchronously under the thrust of the second spring 21, causing the steel pipe limiting rod 13 to exit from the through hole 12 of the first limiting clamp 7. This eliminates the area of ​​the steel pipe limiting rod 13 blocking the seamless steel pipe and completely avoids the liquid immersion blind spot caused by the steel pipe limiting rod 13.

[0037] After the seamless steel pipe is clamped in place, the second cylinder is activated and drives the lifting plate 2 and the movable top plate 4 to move synchronously downwards along the frame 1, so that the vertical seamless steel pipe is completely submerged in the immersion coating tank 6. The anti-corrosion liquid flows freely through the multiple sets of through holes 12 on the first limiting clamp 7, fully covering the outer and inner walls of the steel pipe, realizing an all-round immersion coating operation and ensuring that the corrosion-resistant coating is fully and evenly applied. After the immersion coating is completed, the second cylinder reverses its movement to drive the lifting plate 2 and the movable top plate 4 to move upwards as a whole, smoothly lifting the steel pipe and completely removing it from the immersion coating tank 6. The residual liquid on the clamp and inside the steel pipe can be smoothly discharged through the through holes 12, avoiding local accumulation and flow of the anti-corrosion liquid.

[0038] After the liquid is discharged from the steel pipe, the first cylinder further increases its output force, driving the movable top plate 4 to continue to push upward. The pushing force overcomes the weight of the gravity top block 3, pushing the gravity top block 3 to slide upward along the drying tube cavity 30, thereby pushing the seamless steel pipe and the entire steel pipe placement seat into the drying tube cavity 30. The spout 33 at the upper end of the gravity top block 3 is simultaneously inserted into the hot air blower installation channel 28, and the heating blower 29 is automatically turned on when the automatic start-stop switch 34 is touched. Hot air is sent into the steel pipe through the hot air blower installation channel 28, the spout 33 and the air inlet duct 32, and then diffuses outward through the through hole 12 of the first limiting clamp 7. The humid and hot airflow after heat exchange flows into the exhaust channel 35 through the air outlet duct 36 and is discharged outward, forming a stable internal inlet and external exhaust circulating airflow in the drying tube cavity 30, quickly blowing away residual liquid droplets on the surface of the steel pipe and accelerating the drying and curing of the anti-corrosion coating on the inner and outer walls.

[0039] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A processing equipment for corrosion-resistant seamless steel pipes, characterized in that, include: A frame (1) is provided with a lifting plate (2), which is movably connected to the frame (1) in the upper and lower parts. A gravity block (3) is provided on the bottom surface of the lifting plate (2), and a movable top plate (4) is provided below the lifting plate (2). The movable top plate (4) is movably connected to the lifting plate (2) in the upper and lower parts. A steel pipe placement seat is provided on the top surface of the movable top plate (4), which is located directly below the gravity block (3) and the two are arranged opposite to each other. Dipping tank (6) is located below movable top plate (4).

2. The processing equipment for corrosion-resistant seamless steel pipes according to claim 1, characterized in that, The steel pipe placement seat includes a chassis (5) set on a movable top plate (4). A first limiting clamp (7) is fixed on the chassis (5). An extension (8) is provided at the bottom end of the gravity top block (3). A second limiting clamp (9) is fixed on the extension (8). The second limiting clamp (9) is located directly above the first limiting clamp (7). Both the first limiting clamp (7) and the second limiting clamp (9) are bowl-shaped and their openings are arranged opposite to each other.

3. The processing equipment for corrosion-resistant seamless steel pipes according to claim 2, characterized in that, The outer edge of the first limiting clamp (7) is fixed to the chassis (5) by a first reinforcing rib (10), and the outer edge of the second limiting clamp (9) and the extension (8) are fixed by a second reinforcing rib (11).

4. The processing equipment for corrosion-resistant seamless steel pipes according to claim 2, characterized in that, The side wall of the first limiting clamp (7) is provided with a number of through hole groups. The through hole groups are arranged axially along the central axis of the first limiting clamp (7). Each through hole group contains a number of through holes (12). The through holes (12) in the same through hole group are evenly arranged circumferentially with the central axis of the first limiting clamp (7) as the center.

5. The processing equipment for corrosion-resistant seamless steel pipes according to claim 4, characterized in that, The chassis (5) is provided with several steel pipe limiting rods (13). The steel pipe limiting rods (13) are arranged circumferentially around the central axis of the first limiting clamp (7). The steel pipe limiting rods (13) correspond one-to-one with the through holes (12) of the corresponding through hole group, and the steel pipe limiting rods (13) and the through holes (12) are connected by sliding up and down.

6. The processing equipment for corrosion-resistant seamless steel pipes according to claim 5, characterized in that, The steel pipe placement base also includes a base column (14) and a bottom column (15). The base column (14) is fixed on the top surface of the movable top plate (4). The lower end face of the bottom column (15) is provided with a base column groove (16) that matches the base column (14). The bottom column (15) is fitted onto the base column (14) through the base column groove (16) and is slidably connected to it. A first... A spring (17) is provided. The base (5) is fixed to the upper end face of the base column (15). The steel pipe limiting rod (13) is arranged circumferentially on the outside of the base column (15). The base (5) is provided with a limiting rod through hole (18) that matches the steel pipe limiting rod (13). The top end of the steel pipe limiting rod (13) passes through the limiting rod through hole (18) and a side locking block (19) is fixed thereon. The steel pipe limiting rod (13) and the limiting rod through hole (18) The bottom column (15) is connected to the bottom column (15) by sliding up and down. A movable ring (20) is sleeved on the outside of the bottom column (15). The movable ring (20) and the bottom column (15) are connected to slide up and down. The bottom end of the steel pipe limiting rod (13) is fixed on the movable ring (20). A second spring (21) is provided between the movable ring (20) and the chassis (5). A pin groove (22) is provided on the inner ring wall of the movable ring (20). A magnetic pin (23) is slidably connected inside the pin groove (22). A third spring (24) is provided between the bottom surface of the pin groove (22) and the end surface of the magnetic pin (23). A pin positioning hole (25) matching the magnetic pin (23) is provided on the side wall of the bottom column (15). A magnetic terminal (26) matching the magnetic pin (23) is fixed on the side wall of the base column (14). The magnetic pin (23) and the magnetic terminal (26) repel each other.

7. The processing equipment for corrosion-resistant seamless steel pipes according to claim 2, characterized in that, A hot air blower base (27) is fixed on the lifting plate (2). A hot air blower installation channel (28) is provided on the hot air blower base (27). A heating fan (29) is fixed inside the hot air blower installation channel (28). A drying tube cavity (30) is fixed at the bottom of the hot air blower base (27). The hot air blower installation channel (28) is located inside the drying tube cavity (30) and the two are interconnected. The gravity top block (3) is placed inside the drying tube cavity (30) and is slidably connected to it. The drying tube... A circumferential retaining ring (31) is fixed at the lower end of the cavity (30). The outer diameter of the steel pipe placement seat and the outer diameter of the second limiting clamp (9) are both smaller than the inner diameter of the circumferential retaining ring (31). An air inlet channel (32) is provided on the gravity top block (3). One end of the air inlet channel (32) is located on the top surface of the gravity top block (3) and is opposite to the hot air blower installation channel (28). The other end of the air inlet channel (32) is located on the bottom surface of the second limiting clamp (9) and is opposite to the first limiting clamp (7).

8. The processing equipment for corrosion-resistant seamless steel pipes according to claim 7, characterized in that, One of the ports of the air inlet duct (32) is fixed with a plug (33) that matches the hot air blower installation channel (28). The plug (33) and the hot air blower installation channel (28) are plugged into each other. The heating fan (29) is provided with an automatic start / stop switch (34) on the side facing the plug (33).

9. The processing equipment for corrosion-resistant seamless steel pipes according to claim 8, characterized in that, The hot air blower base (27) is also provided with an exhaust channel (35), which is located on the side of the hot air blower installation channel (28). The exhaust channel (35) is located inside the drying tube (30) and the two are connected to each other. The gravity top block (3) is provided with an air outlet (36) that matches the exhaust channel (35). The air outlet (36) is located on the side of the air inlet channel (32). The air outlet (36) and the exhaust channel (35) are arranged opposite to each other.

10. A method for processing corrosion-resistant seamless steel pipes, characterized in that, Includes the following steps: Step 1: Place the seamless steel pipe vertically on the steel pipe placement seat, use the circumferentially arranged steel pipe limiting rod (13) to pre-limit the outer periphery of the seamless steel pipe, and move the movable top plate (4) upward to clamp and fix the seamless steel pipe with the weight of the gravity top block (3). Step 2: After clamping into place, the steel pipe limiting rod (13) automatically moves down and retracts to eliminate the blind spot. Then, it drives the whole structure to move down so that the seamless steel pipe is completely immersed in the immersion tank (6) to complete the anti-corrosion liquid immersion coating. Step 3: After the dip coating is completed, lift the seamless steel pipe out of the dip coating tank (6), and move the top plate (4) to continue to lift it. Overcome the weight of the gravity top block (3) and push the seamless steel pipe and the steel pipe placement seat into the drying tube cavity (30). Step 4: After the air duct is connected, the heating fan (29) is automatically started. Hot air is blown in from inside the steel pipe and discharged outward through the bottom through hole (12). It forms a circulating air duct with the exhaust channel (35) to quickly dry the residual liquid on the surface of the seamless steel pipe and make the anti-corrosion coating solidify and dry. Step 5: After drying, all structures are reset, the finished steel pipe is removed, and the process is repeated to achieve continuous processing.

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