Pickling passivation equipment for stainless steel composite welded pipe
By designing a lifting frame system to rotate the welded pipe in the pickling and passivation tank, the problem of uneven contact at the bottom of the welded pipe was solved, and uniform pickling and passivation of the inner and outer walls of the welded pipe was achieved, thus improving the overall quality of the welded pipe.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGSU SHUNCHI PIPE IND CO LTD
- Filing Date
- 2025-04-22
- Publication Date
- 2026-04-17
AI Technical Summary
In the existing technology, during the pickling and passivation process of stainless steel welded pipes, uneven contact between the bottom and the pickling and passivation tank leads to unevenness, which affects the overall quality of the welded pipe.
A pickling and passivation device for stainless steel composite welded pipes was designed. It adopts a lifting frame system driven by a dual-head motor, which makes the welded pipe rotate and rise and fall in the pickling and passivation tank to ensure that the inner and outer walls are in uniform contact with the pickling solution.
This method achieves thorough pickling and passivation of the inner and outer walls of the welded pipe, improving the overall quality and pickling effect of the welded pipe.
Smart Images
Figure CN224133190U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of pickling and passivation equipment, and in particular to a pickling and passivation equipment for stainless steel composite welded pipes. Background Technology
[0002] Stainless steel pickling and passivation is a chemical process that removes surface oxides from stainless steel, aiming to improve its appearance and corrosion resistance. This process typically involves two steps: pickling and passivation. Pickling uses an acid solution to remove oxide scale and rust from the stainless steel surface, while passivation treats the metal surface to form a non-reactive film, thereby improving its corrosion resistance.
[0003] In the current technology, when performing pickling and passivation, the welded pipe is usually placed directly into the pickling and passivation tank. The bottom of the welded pipe will contact the bottom of the pickling and passivation tank, resulting in the contact area not receiving effective pickling and passivation treatment. This leads to incomplete pickling and passivation of the entire welded pipe, affecting the overall quality of the welded pipe. Utility Model Content
[0004] The purpose of this utility model is to address the shortcomings of existing technologies by proposing a pickling and passivation device for stainless steel composite welded pipes.
[0005] To achieve the above objectives, the present invention adopts the following technical solution: a pickling and passivation device for stainless steel composite welded pipes, comprising a pickling and passivation tank, a double-headed motor fixedly connected to the bottom of the pickling and passivation tank, a drive shaft fixedly connected to each of the two output ends of the double-headed motor, a drive bevel gear fixedly connected to the other end of the drive shaft, fixed plates fixedly connected to both outer walls of the pickling and passivation tank, two limit rods fixedly connected to the top of each of the two fixed plates, a baffle fixedly connected to the top of the two limit rods on the same side, a lead screw movably connected to the bottom of the baffle, and a fixed end of the lead screw penetrating through the fixed plate. The system includes a driven bevel gear, a positioning ring fixedly connected to the outer wall of the lead screw, a lifting frame inside the pickling and passivation tank, lifting plates fixedly connected to both outer walls of the lifting frame, the lifting plates threadedly connected to the lead screw, the lifting plates movably connected to a limit rod, driven rollers movably connected to the inner wall of the lifting frame (two driven rollers in total), and driving rollers inside the lifting frame (two driving rollers in total). Lifting gears are fixedly connected to both ends of the two driving rollers, and the lifting gears are located outside the lifting frame. Multiple toothed grooves are formed on the inner wall of the pickling and passivation tank, and the gear meshes with the toothed grooves.
[0006] As a further description of the above technical solution:
[0007] The bottom of the lifting frame has a hollowed-out groove, and there are multiple hollowed-out grooves.
[0008] As a further description of the above technical solution:
[0009] The bottom of the pickling and passivation tank is fixedly connected to a support block, and there are two support blocks, with the two drive shafts passing through the two support blocks respectively.
[0010] As a further description of the above technical solution:
[0011] An inlet is fixedly connected to the outer wall of the pickling and passivation tank, and an inlet solenoid valve is installed on the top of the inlet. An outlet is fixedly connected to the outer wall of the pickling and passivation tank, and an outlet solenoid valve is installed on the top of the outlet.
[0012] As a further description of the above technical solution:
[0013] The bottom of the pickling and passivation tank is provided with shock-absorbing pads, and there are multiple shock-absorbing pads, which are made of polyurethane.
[0014] As a further description of the above technical solution:
[0015] The two limiting rods on the same side are located on both sides of the lead screw on the same side, and the two driven rollers are respectively paired with the two driving rollers.
[0016] This utility model has the following beneficial effects:
[0017] 1. In the initial state, the lifting frame is located at the upper end of the pickling and passivation tank, and multiple lifting gears mesh with the uppermost ends of multiple tooth grooves. The welded pipe is placed between two pairs of driven rollers and driving rollers. Then, the dual-head motor drives two drive shafts and the drive bevel gears connected to them to rotate, causing the two driven bevel gears and the lead screws connected to them to rotate. This causes the two lifting plates to move the lifting frame into the pickling and passivation tank. During the descent of the lifting frame, multiple lifting gears rotate along multiple tooth grooves, thereby causing multiple driving rollers to rotate. The welded pipe placed between the driving rollers and driven rollers will rotate simultaneously. Then, the dual-head motor runs in the opposite direction, causing the lifting frame to rise again in the same way. This process also causes the welded pipe to rotate. After the lifting frame returns to its original position, the pickled and passivated welded pipe can be taken out for the next step. This device allows the welded pipe to rotate with the rotation of the driving rollers during the lifting and lowering process of the lifting frame, so that both the inner and outer walls of the welded pipe can fully contact the liquid in the pickling and passivation tank, making the pickling and passivation of the welded pipe more thorough and improving the quality of the pickling and passivation of the welded pipe.
[0018] 2. During the lifting and lowering process of the two lifting plates, they move along multiple limit rods on both sides to ensure a smoother lifting and lowering process. At the same time, two support blocks are set at the bottom of the pickling and passivation tank, and two drive shafts pass through the two support blocks respectively to improve the stability of the two drive shafts when rotating. An inlet and an outlet are set, and the inlet and outlet of the pickling and passivation solution can be controlled by the inlet solenoid valve and the outlet solenoid valve respectively to replace the pickling and passivation solution in a timely manner. Attached Figure Description
[0019] Figure 1 This is a first-view overall structural schematic diagram of a stainless steel composite welded pipe pickling and passivation equipment proposed in this utility model.
[0020] Figure 2 This is a second-view overall structural schematic diagram of a stainless steel composite welded pipe pickling and passivation equipment proposed in this utility model.
[0021] Figure 3 This is a schematic diagram of the internal structure of the pickling and passivation tank in a stainless steel composite welded pipe pickling and passivation equipment proposed in this utility model.
[0022] Figure 4 This is a schematic diagram of the active roller and driven roller structure of a pickling and passivation equipment for stainless steel composite welded pipes proposed in this utility model.
[0023] Figure 5 This is a schematic diagram of the lifting frame structure of a stainless steel composite welded pipe pickling and passivation equipment proposed in this utility model.
[0024] Figure 6 This is a schematic diagram of the internal structure of a stainless steel composite welded pipe pickling and passivation equipment proposed in this utility model.
[0025] Legend:
[0026] 1. Pickling and passivation tank; 2. Dual-head motor; 3. Drive shaft; 4. Drive bevel gear; 5. Fixing plate; 6. Limiting rod; 7. Baffle; 8. Lead screw; 9. Driven bevel gear; 10. Positioning ring; 11. Lifting frame; 12. Lifting plate; 13. Driven roller; 14. Driven roller; 15. Lifting gear; 16. Gear groove; 17. Hollowed-out groove; 18. Support block; 19. Liquid inlet; 20. Liquid inlet solenoid valve; 21. Liquid outlet; 22. Liquid outlet solenoid valve; 23. Shock-absorbing pad. Detailed Implementation
[0027] Reference Figure 1-6This utility model provides a pickling and passivation device for stainless steel composite welded pipes, comprising a pickling and passivation tank 1, a double-headed motor 2 fixedly connected to the bottom of the pickling and passivation tank 1, a drive shaft 3 fixedly connected to each of the two output ends of the double-headed motor 2, a drive bevel gear 4 fixedly connected to the other end of the drive shaft 3, fixed plates 5 fixedly connected to the outer walls of both sides of the pickling and passivation tank 1, and limit rods 6 fixedly connected to the top of each of the two fixed plates 5, with two limit rods 6 in total. During the lifting process of the two lifting plates 12, they move along the multiple limit rods 6 on both sides to ensure a smoother lifting process of the lifting frame 11. A baffle 7 is fixedly connected to the top of the two limit rods 6 on the same side, and a lead screw 8 is movably connected to the bottom of the baffle 7. The two limit rods 6 on the same side are located on both sides of the lead screw 8 on the same side, and the bottom of the lead screw 8 passes through one side of the fixed plate 5. A driven bevel gear 9 is fixedly connected to the end of the lead screw 8, and a positioning ring 10 is fixedly connected to the outer wall of the lead screw 8. A lifting frame 11 is provided inside the pickling and passivation tank 1. Lifting plates 12 are fixedly connected to the outer walls of both sides of the lifting frame 11. The lifting plates 12 are threadedly connected to the lead screw 8 and are movably connected to the limiting rod 6. A driven roller 13 is movably connected to the inner wall of the lifting frame 11, and there are two driven rollers 13. A driving roller 14 is provided inside the lifting frame 11, and there are two driving rollers 14. The two driven rollers 13 are paired with the two driving rollers 14. Lifting gears 15 are fixedly connected to both ends of the two driving rollers 14. The lifting gears 15 are located outside the lifting frame 11. The inner wall of the pickling and passivation tank 1 is provided with toothed grooves 16, and there are multiple toothed grooves 16. The lifting gears 15 mesh with the toothed grooves 16.
[0028] Initially, the lifting frame 11 is positioned at the upper end of the pickling and passivation tank 1, and multiple lifting gears 15 mesh with the uppermost ends of multiple toothed grooves 16. The welded pipe is placed between two pairs of driven rollers 13 and driving rollers 14. Subsequently, the dual-head motor 2 drives two drive shafts 3 and the drive bevel gears 4 connected to them to rotate, causing two driven bevel gears 9 and the lead screws 8 connected to them to rotate. This causes the two lifting plates 12 to move the lifting frame 11 into the pickling and passivation tank 1. During the descent of the lifting frame 11, the multiple lifting gears 15 rotate along the multiple toothed grooves 16. This causes multiple active rollers 14 to rotate, and the welded pipe placed between the active rollers 14 and the driven rollers 13 will rotate simultaneously. Then, the dual-head motor 2 runs in the opposite direction, and the lifting frame 11 rises again on the same principle. This process can also cause the welded pipe to rotate. After the lifting frame 11 returns to its position, the pickled and passivated welded pipe can be taken out for the next step. This device allows the welded pipe to rotate with the active rollers 14 as it rises and falls with the lifting frame 11, so that the inner and outer walls of the welded pipe can fully contact the liquid in the pickling and passivation tank 1, making the pickling and passivation of the welded pipe more complete and improving the quality of the pickling and passivation of the welded pipe.
[0029] The bottom of the lifting frame 11 is provided with a hollow groove 17, and there are multiple hollow grooves 17. The bottom of the pickling and passivation tank 1 is fixedly connected with a support block 18, and there are two support blocks 18. Two drive shafts 3 pass through the two support blocks 18 respectively. The two support blocks 18 are set at the bottom of the pickling and passivation tank 1, and the two drive shafts 3 pass through the two support blocks 18 respectively, which improves the stability of the two drive shafts 3 when rotating.
[0030] An inlet 19 is fixedly connected to the outer wall of the pickling and passivation tank 1. An inlet solenoid valve 20 is installed on the top of the inlet 19. An outlet 21 is fixedly connected to the outer wall of the pickling and passivation tank 1. An outlet solenoid valve 22 is installed on the top of the outlet 21. The inlet 19 and outlet 21 are set so that the inlet and outlet of the pickling and passivation solution can be controlled by the inlet solenoid valve 20 and the outlet solenoid valve 22 respectively, so as to replace the pickling and passivation solution in time. The bottom of the pickling and passivation tank 1 is provided with shock-absorbing pads 23, and there are multiple shock-absorbing pads 23. The shock-absorbing pads 23 are made of polyurethane.
[0031] Working principle: In the initial state, the lifting frame 11 is located at the upper end of the pickling and passivation tank 1, and multiple lifting gears 15 are engaged with the uppermost ends of multiple toothed grooves 16. The welded pipe is placed between the two pairs of driven rollers 13 and the driving roller 14. Then, the dual-head motor 2 drives the two drive shafts 3 and the drive bevel gears 4 connected to them to rotate, causing the two driven bevel gears 9 and the lead screw 8 connected to them to rotate. This causes the two lifting plates 12 to move the lifting frame 11 into the pickling and passivation tank 1. During the descent of the lifting frame 11, the multiple lifting gears 15 move along the multiple toothed grooves 16. The rotation of roller 6 causes multiple active rollers 14 to rotate, and the welded pipe placed between the active rollers 14 and the driven rollers 13 rotates simultaneously. Then, the dual-head motor 2 runs in the opposite direction, causing the lifting frame 11 to rise again on the same principle. This process also causes the welded pipe to rotate. After the lifting frame 11 returns to its original position, the pickled and passivated welded pipe can be taken out for the next step. This device allows the welded pipe to rotate with the active rollers 14 as it rises and falls with the lifting frame 11, so that both the inner and outer walls of the welded pipe can fully contact the liquid in the pickling and passivation tank 1, improving the pickling and passivation of the welded pipe and enhancing the quality of the welded pipe.
[0032] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A pickling and passivating plant for stainless steel composite welded pipes, comprising a pickling and passivating tank (1), characterized in that: A double-headed motor (2) is fixedly connected to the bottom of the pickling and passivation tank (1). A drive shaft (3) is fixedly connected to both output ends of the double-headed motor (2). A drive bevel gear (4) is fixedly connected to the other end of the drive shaft (3). Fixed plates (5) are fixedly connected to both outer walls of the pickling and passivation tank (1). Limiting rods (6) are fixedly connected to the top of the two fixed plates (5). There are two limiting rods (6) on each side. A baffle (7) is fixedly connected to the top of the two limiting rods (6) on the same side. A lead screw (8) is movably connected to the bottom of the baffle (7). A driven bevel gear (9) is fixedly connected to one end of the lead screw (8) that passes through the fixed plate (5). A positioning ring (10) is fixedly connected to the outer wall of the lead screw (8). The interior of the pickling and passivation tank (1) A lifting frame (11) is provided, and lifting plates (12) are fixedly connected to the outer walls on both sides of the lifting frame (11). The lifting plates (12) are threadedly connected to the lead screw (8). The lifting plates (12) are movably connected to the limiting rod (6). A driven roller (13) is movably connected to the inner wall of the lifting frame (11), and there are two driven rollers (13). An active roller (14) is provided inside the lifting frame (11), and there are two active rollers (14). Lifting gears (15) are fixedly connected to both ends of the two active rollers (14). The lifting gears (15) are located outside the lifting frame (11). The inner wall of the pickling and passivation tank (1) is provided with toothed grooves (16), and there are multiple toothed grooves (16). The lifting gears (15) mesh with the toothed grooves (16).
2. The pickling and passivation equipment for stainless steel composite welded pipes according to claim 1, characterized in that: The bottom of the lifting frame (11) is provided with a hollow groove (17), and there are multiple hollow grooves (17).
3. A pickling and passivation plant for stainless steel composite welded pipes according to claim 1, characterized in that: The bottom of the pickling and passivation tank (1) is fixedly connected to a support block (18), and there are two support blocks (18), with the two drive shafts (3) passing through the two support blocks (18) respectively.
4. A pickling and passivation plant for stainless steel composite welded pipes according to claim 1, characterized in that: The outer wall of the pickling and passivation tank (1) is fixedly connected to an inlet (19), and an inlet solenoid valve (20) is installed on the top of the inlet (19). The outer wall of the pickling and passivation tank (1) is fixedly connected to a drain (21), and a drain solenoid valve (22) is installed on the top of the drain (21).
5. A pickling and passivation plant for stainless steel composite welded pipes according to claim 1, characterized in that: The bottom of the pickling and passivation tank (1) is provided with a shock-absorbing pad (23), and there are multiple shock-absorbing pads (23), which are made of polyurethane.
6. A pickling and passivation plant for stainless steel composite welded pipes according to claim 1, characterized in that: The two limiting rods (6) on the same side are located on both sides of the lead screw (8) on the same side, and the two driven rollers (13) are paired with the two driving rollers (14).