Pickling device for stainless steel pipe machining
By combining hydraulic drive and ultrasonic cleaning in the stainless steel pipe pickling device, the problem of dead corners in stainless steel pipe pickling was solved, and uniform pickling of the inner and outer walls of stainless steel pipes was achieved, thus improving pickling quality and production efficiency.
Patent Information
- Application Number
- CN202522087497.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-28
- Publication Date
- 2026-08-25
- Estimated Expiration
- 2035-09-28
AI Technical Summary
Existing stainless steel pipes are prone to forming dead corners during pickling, resulting in uneven pickling quality, especially where oxide scale is difficult to remove at the contact points with the support.
An acid pickling device is adopted, which includes an acid pickling tank, a slide, a hydraulic cylinder, an ultrasonic generator, and a flexible fixing structure. By combining hydraulic drive and ultrasonic cleaning, it ensures that the inner and outer walls of the stainless steel pipe are in uniform contact with the acid solution, and the flexible fixing structure adapts to stainless steel pipes of different diameters.
It significantly improves the consistency of the surface quality of stainless steel pipes after pickling, avoids scratches on the surface caused by traditional fixing methods, balances production efficiency and pickling quality, and eliminates the need for frequent fixture changes.
Smart Images
Figure CN224678161U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of stainless steel pipe processing technology, and in particular to a pickling device for stainless steel pipe processing. Background Technology
[0002] Pickling is a method of removing oxide scale and rust from the surface of steel using acid solutions. It is a way to clean metal surfaces and is usually carried out in conjunction with pre-coating. Generally, the workpiece is immersed in an aqueous solution of sulfuric acid or the like to remove thin films of oxides from the metal surface. It is a pretreatment or intermediate treatment for processes such as electroplating, enamel, and rolling. Stainless steel pickling refers to the removal of the oxide film on the surface of stainless steel. After pickling, a dense oxide film is formed on the surface of stainless steel. This process is called pickling passivation. This film is the key to preventing stainless steel from rusting and corroding in general media.
[0003] However, existing stainless steel pipes are either placed on supports or directly in the pickling tank during pickling, which easily creates dead corners where the stainless steel pipes come into contact with the pickling tank. The areas where the supports come into contact are covered with unremoved oxide scale, which is difficult to remove and affects the quality of pickling. Utility Model Content
[0004] To address the shortcomings of existing technologies, this utility model provides a pickling device for stainless steel pipe processing, which solves the technical problem that existing stainless steel pipes are either placed on a support or directly in the pickling tank during pickling, resulting in dead corners where the stainless steel pipe contacts the pickling tank, and the area in contact with the support is covered with unwashed oxide scale that is difficult to remove, thus affecting the quality of pickling.
[0005] To achieve the above objectives, this utility model provides the following technical solution:
[0006] A pickling device for processing stainless steel pipes includes a pickling tank. Slides are symmetrically fixedly installed on the upper end of the pickling tank. A connecting strip is fixedly installed between the two slides. A hydraulic cylinder is fixedly installed on the upper end of the connecting strip. A hydraulic telescopic rod is installed on the output end of the hydraulic cylinder. Ultrasonic generators are symmetrically arranged in the inner wall of the pickling tank. Mounting frames are slidably installed on the two slides. A cross groove is formed inside the mounting frame. A fixing plate is fixedly installed at the center of the upper end of the mounting frame. A drive motor is fixedly installed on the side wall of the mounting frame. A lead screw is installed on the output end of the drive motor. The lead screw is housed in a cross groove, and cross blocks are symmetrically slidably installed inside the cross groove. The threads at both ends of the lead screw are opposite, and both cross blocks are threadedly connected to the lead screw. A positioning mechanism is fixedly installed at the lower end of each of the two cross blocks. The positioning mechanism includes a connecting cylinder, and the two connecting cylinders are respectively fixedly connected to the two cross blocks. A screw rod slides inside each of the two connecting cylinders, and a nut is threadedly installed on each of the two screw rods. A stable support structure is built through a slide and connecting strip. A hydraulic cylinder drives a hydraulic telescopic rod to raise and lower the mounting frame, providing an adjustable vertical movement base for subsequent steel pipe positioning and pickling.
[0007] Preferably, positioning posts are fixedly installed on the opposite ends of the two screws, and inner grooves are equally spaced on the two positioning posts to facilitate the installation, removal and position adjustment of the positioning components and to adapt to steel pipes of different lengths.
[0008] Preferably, both sets of inner grooves have rotating rods rotatably installed inside them, and both sets of rotating rods have symmetrically opened circular grooves to provide rotational installation space for the rotating rods and lay the structural foundation for the internal support and fixation of the steel pipe.
[0009] Preferably, a torsion spring is fixedly installed in the inner wall of each of the circular grooves, and the end of each torsion spring away from the circular groove is fixedly connected to the inner wall of the inner groove, so that the rotating rod can adaptively rotate with the curvature of the inner wall of the steel pipe, which is convenient for fitting steel pipes of different diameters.
[0010] Preferably, each of the rotating rods is rotatably mounted with a roller, which converts sliding friction into rolling, thus avoiding scratching the inner wall of the steel pipe during fixing.
[0011] Preferably, a spring is fixedly installed between each of the rotating rods and the inner groove to enhance the elastic support of the rotating rods, ensure that the rollers are stably pressed against the inner wall of the steel pipe, and improve the reliability of the fixation.
[0012] Compared with the prior art, the present invention has the following beneficial effects:
[0013] This invention avoids the squeezing and scratching of the outer surface of the steel pipe caused by traditional external clamping, while ensuring that both the inner and outer walls of the hollow stainless steel pipe are in full contact with the pickling solution. This protects the integrity of the workpiece surface and completely solves the problem of dead corners in the inner wall pickling caused by the support and obstruction in traditional pickling. It significantly improves the consistency of the surface quality of the steel pipe after pickling. Moreover, the elastic fixing structure can adapt to hollow stainless steel pipes of different diameters, eliminating the need for frequent clamp changes and indirectly reducing the process connection time, thus balancing pickling quality and production efficiency. Attached Figure Description
[0014] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings.
[0015] Figure 1 This is a three-dimensional structural diagram of the present invention;
[0016] Figure 2 This is a diagram of the carriage connection structure of this utility model;
[0017] Figure 3 This is an exploded structural diagram of the cross-shaped block connection of this utility model;
[0018] Figure 4 This is an exploded structural diagram of the positioning post connection of this utility model;
[0019] Figure 5 This is an exploded structural diagram of the rotating rod connection of this utility model.
[0020] Legend: 1. Pickling tank; 2. Slide; 3. Connecting bar; 4. Hydraulic cylinder; 5. Hydraulic telescopic rod; 6. Ultrasonic generator; 7. Mounting bracket; 8. Cross groove; 9. Fixing plate; 10. Drive motor; 11. Lead screw; 12. Cross block; 13. Connecting cylinder; 14. Screw; 15. Nut; 16. Positioning pin; 17. Inner groove; 18. Rotating rod; 19. Circular groove; 20. Torsion spring; 22. Roller; 23. Spring. Detailed Implementation
[0021] This application provides a pickling device for stainless steel pipe processing, which effectively solves the problem that existing stainless steel pipes are either placed on supports or directly in the pickling tank during pickling, resulting in dead corners where the stainless steel pipe contacts the pickling tank. The areas where the support contacts are covered with unremoved oxide scale, which is difficult to remove and affects the pickling quality. This utility model completely solves the problem of dead corners in the inner wall pickling caused by the support obstruction in traditional pickling, significantly improves the consistency of the surface quality of the steel pipe after pickling, and the elastic fixing structure can adapt to hollow stainless steel pipes of different diameters, eliminating the need for frequent clamp changes and indirectly reducing process connection time, thus balancing pickling quality and production efficiency.
[0022] Example
[0023] like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the technical solution in this application embodiment effectively solves the technical problem that existing stainless steel pipes are either placed on supports or directly in the pickling tank during pickling, which easily leads to dead corners where the stainless steel pipes contact the pickling tank, and the area where the supports contact is full of unwashed oxide scale that is difficult to remove, thus affecting the pickling quality. The overall idea is as follows: A pickling device for stainless steel pipe processing includes a pickling tank 1, with slides 2 symmetrically fixedly installed at the upper end of the pickling tank 1, a connecting strip 3 fixedly installed between the two slides 2, a hydraulic cylinder 4 fixedly installed at the upper end of the connecting strip 3, a hydraulic telescopic rod 5 installed on the output end of the hydraulic cylinder 4, and ultrasonic generators 6 symmetrically arranged in the inner wall of the pickling tank 1;
[0024] Each ultrasonic generator 6 includes one high-frequency vibrating plate and two piezoelectric ceramic transducers. The vibrating plate is made of 316L stainless steel with a thickness of 5-8mm. It is fixed to the inner wall of the pickling tank with acid-resistant sealant. The plate surface is tilted at a 30° angle to the tank wall to ensure that the vibration waves converge towards the center area of the tank. The transducers are embedded in the back of the vibrating plate and electrically connected to the external ultrasonic control box. The working frequency is adjustable in the range of 25-40kHz, and the power of a single unit is 500-800W.
[0025] During operation, the ultrasonic control box can adjust the output power according to the diameter of the steel pipe and the thickness of the oxide scale: for thin pipes with a diameter ≤50mm, a high frequency of 35-40kHz and low power is used to avoid excessive cavitation damage to the inner wall; for thick pipes with a diameter >50mm, a low frequency of 25-30kHz and high power is used to enhance the cavitation effect to penetrate the thick oxide scale.
[0026] This design uses symmetrically distributed vibrating plates to form a cross acoustic wave field. When the steel pipe is suspended in the center of the pickling tank, the ultrasonic waves can act on the inner and outer walls of the steel pipe in all directions. The micro-jet generated by its cavitation effect can peel off the oxide scale that has been corroded by the acid and accelerate the flow of acid on the inner wall of the steel pipe. Combined with the unobstructed state formed by the internal support fixation, it completely eliminates pickling dead corners and improves pickling efficiency by more than 30%.
[0027] Mounting brackets 7 are slidably mounted on two slides 2. A cross groove 8 is provided inside the mounting bracket 7. A fixing plate 9 is fixedly mounted at the center of the upper end of the mounting bracket 7. A drive motor 10 is fixedly mounted on the side wall of the mounting bracket 7. A lead screw 11 is mounted on the output end of the drive motor 10. The lead screw 11 is located in the cross groove 8. Cross blocks 12 are symmetrically slidably mounted inside the cross groove 8. The threads at both ends of the lead screw 11 are opposite. Both cross blocks 12 are threadedly connected to the lead screw 11. A connecting cylinder 13 is fixedly mounted at the lower end of both cross blocks 12. A screw rod 14 slides inside both connecting cylinders 13. Nuts 15 are threadedly mounted on both screw rods 14. When disassembling, the nuts 15 can be rotated on the screw rods 14. When the nuts 15 are detached from the screw rods 14, disassembly can be completed, making loading and unloading more convenient.
[0028] Positioning pins 16 are fixedly installed on the opposite ends of the two screws 14. The two positioning pins 16 are equally spaced with inner grooves 17. Rotating rods 18 are rotatably installed inside the two sets of inner grooves 17. Circular grooves 19 are symmetrically opened on the two sets of rotating rods 18. Torsion springs 20 are fixedly installed in the inner wall of each circular groove 19. The end of each torsion spring 20 away from the circular groove 19 is fixedly connected to the inner wall of the inner groove 17. Rollers 22 are rotatably installed on each rotating rod 18. The design of the rollers 22 makes it difficult for the equipment to slide and rub against the inner wall of the hollow stainless steel tube during the fixing process. Rolling friction can effectively avoid damage to the hollow stainless steel tube during fixing.
[0029] A spring 23 is fixedly installed between each rotating rod 18 and the inner groove 17. In use, the hollow stainless steel tube can be placed between the two positioning posts 16, and then the drive motor 10 can be started. Under the action of the drive motor 10, the lead screw 11 will rotate, which in turn will drive the two threaded cross blocks 12 to move relative to each other. The two cross blocks 12 will drive the two connecting cylinders 13 and the positioning posts 16 to move relative to each other. At this time, the two positioning posts 16 will drive the two sets of rotating rods 18 to move relative to each other. When the two sets of rotating rods 18 slide into the hollow stainless steel tube, the roller 22 will contact the inner wall of the hollow stainless steel tube. The two sets of rotating rods 18 will be subjected to compressive force and will flip inward into the inner groove 17. At this time, the spring 23 will be compressed, and the torsion spring 20 will be twisted. The two together generate elastic force to tighten the roller 22. The clamp is tightly pressed against the inner wall of the hollow stainless steel tube to fix it, avoiding the squeezing, scratching, or obstruction of the outer surface of the steel tube caused by traditional external clamping, thus protecting the integrity of the workpiece surface. The elastic force adapts to the inner wall size of the steel tube, making it compatible with hollow stainless steel tubes of a certain diameter range. This eliminates the need for frequent clamp changes, improving equipment versatility. Then, the hydraulic cylinder 4 is activated, causing the hydraulic telescopic rod 5 to extend and retract. The hydraulic telescopic rod 5 then drives the mounting frame 7 to slide downwards on the slide 2, which in turn moves the hollow stainless steel tube downwards. At this point, the hollow stainless steel tube is immersed in the pickling tank 1 and is in a suspended state. This suspended design allows the hollow stainless steel tube to be fully immersed, ensuring that both the inner and outer walls react fully with the acid, guaranteeing uniform pickling and achieving efficient, uniform, and safe pickling treatment.
[0030] To address the problems existing in the prior art, this utility model provides a pickling device for stainless steel pipe processing. This utility model completely solves the problem of dead corners in the inner wall pickling caused by the support and obstruction in traditional pickling, significantly improves the consistency of the surface quality of the steel pipe after pickling, and the elastic fixing structure can adapt to hollow stainless steel pipes of different diameters without frequent clamp changes, indirectly reducing the process connection time, and balancing pickling quality and production efficiency.
[0031] Working principle:
[0032] The first step is to place the hollow stainless steel tube between the two positioning posts 16. Then, start the drive motor 10. The drive motor 10 will drive the lead screw 11 to rotate, which in turn will drive the two threaded cross blocks 12 to move relative to each other. The two cross blocks 12 will drive the two connecting cylinders 13 and the positioning posts 16 to move relative to each other. At this time, the two positioning posts 16 will drive the two sets of rotating rods 18 to move relative to each other. When the two sets of rotating rods 18 slide into the hollow stainless steel tube, the roller 22 will contact the inner wall of the hollow stainless steel tube. The two sets of rotating rods 18 will be squeezed and rotated into the inner groove 17. At this time, the spring 23 will be compressed and the torsion spring 20 will be twisted. The two together will generate elastic force to press the roller 22 tightly against the hollow stainless steel tube. The hollow stainless steel tube is fixed inside the inner wall, avoiding the squeezing, scratching or obstruction of the outer surface of the steel tube caused by traditional external clamping, protecting the integrity of the workpiece surface. The elastic force adapts to the inner wall size of the steel tube and can accommodate hollow stainless steel tubes of a certain diameter range. It eliminates the need for frequent clamp replacement and improves the versatility of the equipment. Then, the hydraulic cylinder 4 can be activated. Under the action of the hydraulic cylinder 4, the hydraulic telescopic rod 5 will extend and retract. At this time, the hydraulic telescopic rod 5 will drive the mounting frame 7 to slide downward on the slide 2. The mounting frame 7 will drive the hollow stainless steel tube to move downward. At this time, the hollow stainless steel tube will be immersed in the pickling tank 1 and in a suspended state. The suspended design allows the hollow stainless steel tube to be fully immersed in all directions, and both the inner and outer walls can fully react with the acid, ensuring the uniformity of pickling and achieving efficient, uniform and safe pickling treatment.
[0033] The second step involves the design of the roller 22, which makes it difficult for the equipment to slide and rub against the inner wall of the hollow stainless steel tube during the fixing process. The rolling friction can effectively prevent damage to the hollow stainless steel tube during fixing. Furthermore, the nut 15 can be rotated on the screw 14 during disassembly. Once the nut 15 is removed from the screw 14, the disassembly can be completed, making loading and unloading more convenient.
[0034] Finally, it should be noted that the above embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the implementation. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.
Claims
1. A pickling device for processing stainless steel pipes, comprising a pickling tank (1), wherein slides (2) are symmetrically fixedly installed on the upper end of the pickling tank (1), a connecting strip (3) is fixedly installed between the two slides (2), a hydraulic cylinder (4) is fixedly installed on the upper end of the connecting strip (3), and a hydraulic telescopic rod (5) is installed on the output end of the hydraulic cylinder (4), characterized in that, An ultrasonic generator (6) is symmetrically arranged in the inner wall of the pickling tank (1). An installation frame (7) is slidably installed on the two slides (2). A cross groove (8) is opened inside the installation frame (7). A fixing plate (9) is fixedly installed at the center of the upper end of the installation frame (7). A drive motor (10) is fixedly installed on the side wall of the installation frame (7). A lead screw (11) is installed on the output end of the drive motor (10). The lead screw (11) is located in the cross groove (8). Cross blocks (12) are symmetrically slidably installed inside the cross groove (8). The threads at both ends of the lead screw (11) are opposite. Both cross blocks (12) are threadedly connected to the lead screw (11). A positioning mechanism is fixedly installed at the lower end of each of the two cross blocks (12); The positioning mechanism includes a connecting cylinder (13), two connecting cylinders (13) are fixedly connected to two cross blocks (12) respectively, and a screw (14) slides inside each of the two connecting cylinders (13), and a nut (15) is threaded on each of the two screws (14).
2. The pickling apparatus for processing stainless steel pipes as described in claim 1, characterized in that, Positioning pins (16) are fixedly installed on the opposite ends of the two screws (14), and inner grooves (17) are equally spaced on the two positioning pins (16).
3. The pickling apparatus for stainless steel pipe processing as described in claim 2, characterized in that, Both sets of inner grooves (17) are rotatably mounted with rotating rods (18), and both sets of rotating rods (18) are symmetrically provided with circular grooves (19).
4. The pickling apparatus for stainless steel pipe processing as described in claim 3, characterized in that, A torsion spring (20) is fixedly installed in the inner wall of each of the circular grooves (19), and the end of each torsion spring (20) away from the circular groove (19) is fixedly connected to the inner wall of the inner groove (17).
5. The pickling apparatus for stainless steel pipe processing as described in claim 3, characterized in that, Each of the aforementioned rotating rods (18) is rotatably mounted with a roller (22).
6. The pickling apparatus for stainless steel pipe processing as described in claim 5, characterized in that, A spring (23) is fixedly installed between each of the aforementioned rotating rods (18) and the inner groove (17).