A pickling device for cold-drawing steel pipes

Abstract

The present application relates to a kind of steel pipe cold-drawing processing pickling device, including pickling tank, fixed on the upper and lower material platform of pickling tank and be used to position the combination tooling of steel pipe, the middle part of the upper and lower material platform is slidably connected with the lifting platform driven by lifting mechanism, the present application relates to steel pipe processing technical field.A kind of steel pipe cold-drawing processing pickling device, by the innovative modular combination tooling design, solves the core problem of individual contact shielding in batch processing, multiple assembly seats can be quickly stacked, the semicircular groove of each assembly seat forms independent circular groove after merging, so that each steel pipe can be accurately separated and fixed in its own slot position, when batch pickling, steel pipe does not contact each other, completely avoid the covering effect caused by accumulation, ensure that pickling liquor can be in contact with steel pipe 360 degrees full surface, so as to improve productivity, while ensuring the uniformity and thoroughness of each steel pipe pickling.

Description

Technical Field

[0001] This invention relates to the field of steel pipe processing technology, specifically to a pickling device for cold drawing of steel pipes. Background Technology

[0002] In the cold drawing process of steel pipes, pickling is a crucial pretreatment step. Its purpose is to remove iron oxide scale, rust, and other impurities from the surface of the steel pipe, providing a clean and activated surface for subsequent cold drawing deformation, thereby ensuring product quality and mold life. Traditional steel pipe pickling methods often employ single-pipe hanging or basket immersion. While single-pipe hanging pickling ensures that each steel pipe is processed independently, avoiding mutual obstruction, it is cumbersome, inefficient, and requires a large area, and the hanging points may create pickling dead zones. Basket immersion allows for batch processing, but the steel pipes are tightly packed in the basket, preventing sufficient contact between their contact surfaces and the pickling solution, resulting in uneven pickling, low efficiency, and surface scratches caused by friction between the pipes. This is particularly detrimental to the subsequent cold drawing process, which requires high surface quality. Furthermore, the impurity filtration and recycling systems for the pickling solution in traditional processes are often inadequate, easily leading to impurity accumulation that affects the pickling effect and the lifespan of the pickling solution. Therefore, there is an urgent need to develop an integrated pickling device that can achieve efficient batch processing, ensure uniform and thorough pickling of each steel pipe, reduce surface damage, and automatically purify the acid solution. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a pickling apparatus for cold-drawing steel pipes, which solves the aforementioned problems.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solution: a pickling device for cold drawing of steel pipes, comprising a pickling tank, a loading and unloading platform fixed above the pickling tank, and a combination tooling for positioning the steel pipes, wherein a lifting platform driven by a lifting mechanism is slidably connected to the middle of the loading and unloading platform, and the lifting platform is located directly above the pickling tank. The combined tooling includes multiple assembly seats stacked from top to bottom and placed above the loading and unloading platform. The bottom of the bottom assembly seat is provided with multiple damping rollers. The upper and lower assembly seats each have a semi-circular groove forming a circular groove on their opposite sides. The top of the assembly seat is fixedly connected to a plug-in block, and the bottom of the assembly seat has a plug-in groove that matches the plug-in block. A drive plate driven by a drive mechanism is slidably connected to one side of the loading and unloading platform. A baffle driven by a cylinder is slidably connected to the surface of the loading and unloading platform located on the side of the lifting platform. A limit rod is fixedly connected to the inner cavity of the pickling tank. A limit groove adapted to the limit rod is opened in the inner cavity of the lifting platform. Both sides of the pickling tank's inner cavity are slidably connected to pusher plates driven by cylinders. In use, the assembly base is first placed on the side of the drive plate on the loading / unloading platform. Then, the steel pipe is placed in the semi-circular groove for positioning. The assembly bases are then stacked, positioned using insertion slots and blocks. After the steel pipes are arranged separately, the baffle is lowered, and the drive plate pushes the assembly base on the loading / unloading platform until it reaches above the lifting platform. The lifting platform descends, immersing the steel pipes in the pickling solution within the pickling tank for pickling. Built-in aeration equipment enhances the pickling effect, and the pusher plates on both sides push the steel pipes through the circular groove via ball bearings, thoroughly exposing each surface and preventing incomplete pickling. After pickling, the tank is raised, and the pickling process is repeated. This allows for large-scale pickling while separating the steel pipes to prevent contact and incomplete pickling, and also prevents scratches caused by friction.

[0005] As a further aspect of the present invention: the inner cavity of the circular groove is provided with four balls that abut against the surface of the steel pipe in a ring array. The four-point contact through the balls can reduce the scratching that occurs during movement.

[0006] As a further aspect of the present invention: an overflow box is connected to the right side of the pickling tank, and an inclined filter screen is built into the inner cavity of the overflow box. The space above and below the filter screen of the overflow box is connected to the pickling tank.

[0007] As a further aspect of the present invention: a recovery box is connected to the right side of the overflow box, and a partition is fixedly connected to the inner cavity of the recovery box. The inner cavity of the partition has a flared opening that is wider at the top and narrower at the bottom. When in use, if there are impurities inside the acid liquid, they will enter the overflow box under the blowing of the overflow pipe, and then enter the recovery box on the right side through the guide of the inclined filter screen. After passing through the flared opening, they will fall below the partition for collection.

[0008] As a further aspect of the present invention, the height of the combined tooling is lower than the height of the pickling solution in the pickling tank, which allows for effective immersion.

[0009] Compared with the prior art, the present invention has the following advantages: A perfect balance between efficient batch processing and uniform pickling of individual pipes is achieved: Through an innovative modular tooling design, the core challenge of individual pipe contact and obstruction in batch processing is solved. Multiple assembly stands can be quickly stacked, and the semi-circular grooves of each stand, after merging, form independent circular grooves, ensuring that each steel pipe is precisely separated and fixed in its own groove. During batch pickling, the steel pipes do not come into contact with each other, completely avoiding the obstruction effect caused by stacking. This ensures that the pickling solution can contact the entire surface of the steel pipe from 360 degrees, thereby increasing production capacity while guaranteeing the uniformity and thoroughness of pickling for each steel pipe.

[0010] A dynamic pickling mechanism is provided to completely eliminate pickling dead zones: During the pickling process, the pusher plates on both sides of the pickling tank can reciprocate under the drive of cylinders. When the pusher plates move, they push all the steel pipes in the entire fixture, causing them to rotate or shift slightly within their respective circular grooves with the help of ball bearings or damping rollers at the bottom. This "dynamic immersion" process forces the surface of the steel pipe to constantly change its relative position with the pickling solution, effectively eliminating the bubble adhesion zone or liquid flow dead zone that may be generated by static immersion, resulting in more complete oxide scale removal and significantly improving the quality and consistency of pickling.

[0011] An integrated acid self-purification and circulation system was constructed: by connecting the pickling tank with the overflow tank and the recovery tank, a highly efficient impurity separation process was designed. Suspended impurities generated during the pickling process are carried by the liquid flow into the overflow tank, where they undergo preliminary solid-liquid separation through an inclined filter screen, resulting in the clean acid being returned. The trapped impurities slide down the inclined surface of the filter screen and are collected at the bottom of the recovery tank through a funnel-shaped opening. This system continuously removes reaction products and impurities from the acid, maintains the stability of the acid's activity, extends its service life, and reduces the burden of wastewater treatment, embodying the concept of clean production.

[0012] The system achieves a highly automated loading and unloading process: The unit integrates loading and unloading platforms, drive plates, lifting platforms, and multiple cylinder drive mechanisms, enabling full or semi-automation from tooling assembly, loading, transfer, immersion pickling, dynamic treatment to lifting and unloading. The cooperation between the baffles and drive plates ensures precise positioning and transfer of the tooling, while the limit rods and limit grooves ensure stability during the lifting process. This design significantly reduces the intensity of manual operation and the risk of acid exposure, improving production cycle time and operational safety.

[0013] Minimize surface damage to steel pipes: The ball bearings or damping rollers installed in the circular groove of the tooling ensure rolling contact between the steel pipe and the tooling, and the rotation during dynamic pickling is flexibly guided, effectively avoiding scratches and bumps that may be caused by traditional baskets or clamps. It is especially suitable for cold-drawn steel pipes with extremely high requirements for surface integrity. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a cross-sectional view of the structure of the present invention; Figure 3 This is a side view of the structure of the present invention; Figure 4 For the present invention Figure 2 A magnified view of a section at point A in the middle; Figure 5 This is a schematic diagram of the partition structure of the present invention.

[0015] In the diagram: 1. Pickling tank; 2. Loading and unloading platform; 3. Lifting platform; 5. Assembly base; 6. Insertion block; 7. Insertion groove; 8. Circular groove; 9. Ball bearing; 10. Damping roller; 11. Drive plate; 12. Overflow box; 13. Recycling box; 14. Filter screen; 15. Baffle; 16. Trumpet mouth; 17. Limit groove; 18. Limit rod; 19. Baffle; 20. Push plate. Detailed Implementation

[0016] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0017] Please see Figure 1-5 The present invention provides a technical solution: a steel pipe cold drawing pickling device, including a pickling tank 1, a loading and unloading platform 2 fixed above the pickling tank 1 and a combination tooling for positioning the steel pipe. The loading and unloading platform 2 is slidably connected to a lifting platform 3 driven by a lifting mechanism in the middle, and the lifting platform 3 is located directly above the pickling tank 1. The assembly fixture includes multiple assembly seats 5 stacked from top to bottom on the loading and unloading platform 2. The bottom of the bottom assembly seat 5 is provided with multiple damping rollers 10. The upper and lower assembly seats 5 are provided with semi-circular grooves forming a circular groove 8 on opposite sides. The top of the assembly seat 5 is fixedly connected with a plug-in block 6, and the bottom of the assembly seat 5 is provided with a plug-in groove 7 that matches the plug-in block 6. A drive plate 11 driven by a drive mechanism is slidably connected to one side of the loading and unloading platform 2. A baffle 19 driven by a cylinder is slidably connected to the surface of the loading and unloading platform 2 located on the side of the lifting platform 3. A limit rod 18 is fixedly connected to the inner cavity of the pickling tank 1. A limit groove 17 adapted to the limit rod 18 is opened in the inner cavity of the lifting platform 3. Both sides of the inner cavity of the pickling tank 1 are slidably connected to pusher plates 20 driven by cylinders. In use, the assembly base 5 is first placed on the side of the drive plate 11 on the loading and unloading platform 2, and then the steel pipe is placed in the semi-circular groove for limiting. Then the assembly base 5 is stacked and positioned by the insertion groove 7 and the insertion block 6. After the steel pipes are placed separately, the baffle 19 is lowered and the drive plate 11 pushes the assembly base 5 to move on the loading and unloading platform 2 until it moves above the lifting platform 3. The lifting platform 3 descends and immerses the steel pipes in the pickling solution in the pickling tank 1 for pickling. The built-in aeration device aerates the water to increase the pickling effect. The pusher plates 20 on both sides move and push the steel pipes in the circular groove 8 through the ball bearings 9 to thoroughly expose each surface and prevent incomplete pickling. After pickling, the tank is raised and the pickling is repeated. This allows for large-scale pickling while separating the steel pipes to prevent them from contacting each other and causing incomplete pickling, and also prevents scratches caused by friction.

[0018] The inner cavity of the circular groove 8 has four balls 9 arranged in a ring array that abut against the surface of the steel pipe. The four-point contact through the balls 9 can reduce the scratching that occurs during movement.

[0019] An overflow tank 12 is connected to the right side of the pickling tank 1. An inclined filter screen 14 is built into the inner cavity of the overflow tank 12. The space above and below the filter screen 14 in the overflow tank 12 is connected to the pickling tank 1.

[0020] The right side of the overflow tank 12 is connected to the recovery tank 13. The inner cavity of the recovery tank 13 is fixedly connected to the partition 15. The inner cavity of the partition 15 has a flared opening 16 that is larger at the top and smaller at the bottom. When in use, if there are impurities inside the acid, they will enter the overflow tank 12 under the blowing of the overflow pipe. Then, they will enter the recovery tank 13 on the right side through the guide of the inclined filter screen 14. After passing through the flared opening 16, they will fall below the partition 15 for collection.

[0021] The height of the combined tooling is lower than the height of the pickling solution in pickling tank 1, which allows for effective immersion.

[0022] The working principle of this invention is an automated, multi-step cyclical process, which is described in detail below: Phase 1: Assembly and loading of tooling Place the first assembly base 5 with damping rollers 10 at the bottom on the starting position of the loading and unloading platform 2 near the drive plate 11.

[0023] The number of steel pipes is matched with the number of semicircular slots on the assembly base and placed side by side into the semicircular slots of the assembly base.

[0024] Take the second assembly base, align the bottom insertion slot 7 with the top insertion block 6 of the first assembly base, align them and put them down so that the upper and lower semi-circular grooves close together to form a complete circular groove 8, enclosing the steel pipe. At this time, the steel pipe is supported by the upper and lower assembly bases and can rotate within the groove to a limited extent.

[0025] Repeat step 3, stacking the assembly bases layer by layer until the predetermined number of processing layers is reached, forming a fully loaded steel pipe assembly tower. During stacking, the fit between all plug-in blocks and plug-in slots ensures precise alignment between each layer.

[0026] Phase Two: Tooling Transfer and Pickling Preparation The drive mechanism of the start drive board 11, such as the motor lead screw, pushes the assembled tooling along the loading and unloading platform 2 until it is pushed directly above the lifting platform 3 in the middle of the platform. Then, the control cylinder drives the baffle 19 to rise, blocking the tooling behind it and preventing it from moving back in subsequent actions.

[0027] Phase 3: Lifting and Immersion and Dynamic Pickling Immersion: The lifting mechanism drives the lifting platform 3 to descend. The limiting rod 18 fixed inside the pickling tank 1 inserts into the limiting groove 17 of the lifting platform 3, ensuring vertical stability during descent. The lifting platform, along with the entire assembly of tooling and steel pipes on it, is immersed in the pickling solution in the pickling tank 1.

[0028] Static immersion and auxiliary aeration are optional: The steel pipe is immersed in acid to initiate the chemical reaction. The built-in aeration device can be activated to introduce air into the bottom of the acid solution, generating bubbles to agitate the acid, enhance the mass transfer process, and accelerate the removal of oxide scale.

[0029] Dynamic processing: The pusher plates 20 on both sides of the pickling tank 1 are activated by the drive cylinder. The pusher plates reciprocate, periodically and gently pushing the outermost steel pipe or transmitting force through the tooling. Since the steel pipe is placed in a circular groove with ball bearings 9, the pushing force causes the steel pipe to roll within the groove. By controlling the movement rhythm of the pusher plates, all steel pipes can be slowly rotated during the pickling process, ensuring that their entire circumferential surface is uniformly and thoroughly pickled without any dead corners.

[0030] Phase 4: Improving output and acid purification Lifting and Draining: After the preset pickling time is reached, the lifting mechanism drives the lifting platform 3, together with the combined tooling and the treated steel pipe, to rise, detach from the pickling liquid, and hover above the pickling tank for a short draining.

[0031] Tooling removal and disassembly: The baffle 19 descends, and the drive plate 11 or other transfer mechanism pushes the drained assembled tooling away from the lifting platform area and to the unloading position. Subsequently, the operator or robot disassembles the assembly layer by layer and removes the pickled steel pipes.

[0032] Continuous acid purification: Throughout the pickling and subsequent settling process, the acid in the pickling tank 1 continuously flows into the overflow tank 12 via overflow. The acid containing impurities passes through the inclined filter screen 14, where the impurities are trapped and slide down the inclined surface, eventually being collected below the partition of the recovery tank 13 through the flared mouth 16; the filtered clear liquid is then returned to the pickling tank or enters the circulation system, achieving online purification of the acid.

[0033] Phase 5: Reset and Cycling The unloaded assembly stands are returned to their original positions or cleaned, ready for the next round of assembly and pickling cycles.

[0034] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A pickling apparatus for cold drawing of steel pipes, comprising a pickling tank (1), a loading / unloading platform (2) fixed above the pickling tank (1), and a combination fixture for positioning the steel pipes, characterized in that: The loading and unloading platform (2) is slidably connected to a lifting platform (3) driven by a lifting mechanism in the middle, and the lifting platform (3) is located directly above the pickling tank (1). The assembly fixture includes multiple assembly seats (5) stacked from top to bottom on the loading and unloading platform (2). The bottom of the bottom assembly seat (5) is provided with multiple damping rollers (10). The upper and lower assembly seats (5) are provided with semi-circular grooves forming a circular groove (8) on opposite sides. The top of the assembly seat (5) is fixedly connected with a plug-in block (6), and the bottom of the assembly seat (5) is provided with a plug-in groove (7) that matches the plug-in block (6). The loading and unloading platform (2) is slidably connected to a drive plate (11) driven by a drive mechanism on one side. The loading and unloading platform (2) is slidably connected to a baffle (19) driven by a cylinder on the surface of the lifting platform (3) on the side. The pickling tank (1) is fixedly connected to a limit rod (18). The lifting platform (3) is provided with a limit groove (17) that matches the limit rod (18) in the inner cavity. Both sides of the inner cavity of the pickling tank (1) are slidably connected to pusher plates (20) driven by cylinders.

2. The pickling apparatus for cold drawing of steel pipes according to claim 1, characterized in that: The inner cavity of the circular groove (8) has four balls (9) arranged in a ring array that abut against the surface of the steel pipe.

3. The pickling apparatus for cold drawing of steel pipes according to claim 1, characterized in that: An overflow box (12) is connected to the right side of the pickling tank (1). An inclined filter screen (14) is built into the inner cavity of the overflow box (12). The space above and below the filter screen (14) of the overflow box (12) is connected to the pickling tank (1).

4. The pickling apparatus for cold drawing of steel pipes according to claim 3, characterized in that: The overflow box (12) is connected to a recycling box (13) on the right side. A partition (15) is fixedly connected to the inner cavity of the recycling box (13). The inner cavity of the partition (15) has a flared opening (16) that is larger at the top and smaller at the bottom.

5. The pickling apparatus for cold drawing of steel pipes according to claim 1, characterized in that: The height of the combined tooling is lower than the height of the pickling solution inside the pickling tank (1).

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