A steel drum shaping device before welding
Patent Information
- Application Number
- CN202522568783.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-03
- Publication Date
- 2026-10-27
- Estimated Expiration
- 2035-12-03
AI Technical Summary
由于辊轮布局未形成连续圆弧，无法模拟钢桶理想圆形轮廓，导致整形时钢板受力不均：一方面，单辊整形易因材料回弹产生椭圆度超差；另一方面，多辊离散布局存在支撑盲区，局部凹陷或鼓包难以彻底纠正，最终钢桶圆度合格率不足85%，需人工二次校形，增加生产成本
[0006]本实用新型在使用时，钢桶在由减速电机驱动的传送带上水平向后匀速移动，传送带通过橡胶同步带传动使从动轮与钢桶相切接触、前侧衔接滚轮滚动支撑，实现低摩擦平稳输送；此时，机架上可转动的第一、第二、第三辊轮依次围绕钢桶外周形成内径适配其外径的连续圆弧结构，通过辊轮中间收缩段对钢桶外表面施加均匀径向压力，动态纠正钢板弯曲后的椭圆度偏差、局部凹陷或凸起，使其规整为圆筒形，同时利用辊轮两端膨大轮廓形成轴向限位挡肩，约束钢桶轴向窜动以保持对中；在钢桶持续后移过程中，正下方的激光焊接头同步对焊缝进行焊接，而传送带同步带传动的恒速特性确保钢桶移动速度与焊接参数匹配，保障钢桶焊接前保持规整圆筒形并完成高质量焊接。
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Figure CN224896048U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of steel drum manufacturing technology, and in particular to a steel drum pre-welding shaping device. Background Technology
[0002] As an important packaging container in industries such as chemical, food, and energy, the manufacturing quality of steel drums directly affects the safety of product transportation and the reliability of storage. In the steel drum production process, the shaping process before welding is particularly critical—the initially rolled steel plate (which is approximately cylindrical) needs to be further shaped into a standard cylindrical shape with satisfactory roundness and axial straightness. Otherwise, misalignment, uneven penetration, or even cracking of the weld can easily occur, seriously affecting the sealing performance and strength of the steel drum.
[0003] In existing technologies, discrete support structures using single or multiple rollers (such as two or four rollers arranged independently) are commonly employed, which can only apply radial pressure to localized areas of the steel drum. Because the roller layout does not form a continuous arc, it cannot simulate the ideal circular contour of the steel drum, resulting in uneven stress on the steel plate during forming. On the one hand, single-roller forming is prone to ellipticity deviations due to material springback; on the other hand, the discrete layout of multiple rollers has support blind spots, making it difficult to completely correct local depressions or bulges. Ultimately, the roundness qualification rate of the steel drum is less than 85%, requiring manual secondary shaping and increasing production costs. Utility Model Content
[0004] To address the shortcomings of existing technologies, this utility model provides a pre-welding shaping device for steel drums, which uses a three-point continuous arc support to accurately match the cylinder profile and improve the roundness qualification rate of the steel drums.
[0005] The purpose of this utility model is achieved as follows: A steel drum shaping device before welding includes a frame on which a first roller, a second roller, and a third roller are rotatably mounted. The first roller, the second roller, and the third roller are arranged sequentially around the outer periphery of the steel drum to form a continuous arc structure. The inner diameter of the arc is adapted to the outer diameter of the steel drum. The cross-sectional dimensions of the two ends of the first roller, the second roller, and the third roller along their own axial direction are larger than the cross-sectional dimensions of the middle part, forming a contour structure that is expanded at both ends and contracted in the middle. A laser welding head is arranged directly below the steel drum. The steel drum moves horizontally backward under the drive of two conveyor belts. The conveyor belts include a reduction motor. The output end of the reduction motor is coaxially arranged with the drive wheel. The drive wheel is connected to the driven wheel through a rubber synchronous belt. The driven wheel is tangentially arranged with the steel drum. Connecting rollers are arranged on the front side of the two driven wheels, and the connecting rollers are in rolling connection with the steel drum.
[0006] In use, the steel drum moves horizontally backward at a constant speed on a conveyor belt driven by a geared motor. The conveyor belt, through rubber synchronous belt transmission, ensures that the driven wheel makes tangential contact with the steel drum, and the front connecting roller provides rolling support, achieving low-friction and stable conveying. At this time, the first, second, and third rotatable rollers on the frame sequentially form a continuous arc structure around the outer circumference of the steel drum, with the inner diameter matching its outer diameter. The rollers apply uniform radial pressure to the outer surface of the steel drum through the middle contraction section, dynamically correcting the ellipticity deviation, local depressions, or protrusions after the steel plate is bent, making it regularized into a cylindrical shape. At the same time, the axial limiting shoulders formed by the expanded contours at both ends of the rollers constrain the axial movement of the steel drum to maintain alignment. During the continuous backward movement of the steel drum, the laser welding head directly below simultaneously welds the weld seam, and the constant speed characteristic of the conveyor belt synchronous belt transmission ensures that the moving speed of the steel drum matches the welding parameters, ensuring that the steel drum maintains a regular cylindrical shape before welding and completing a high-quality weld.
[0007] Compared with the prior art, the beneficial effects of this utility model are as follows: the first, second, and third rollers sequentially form a continuous arc structure around the outer circumference of the steel drum, and the inner diameter of the arc is adapted to the outer diameter of the steel drum. This three-point layout simulates the ideal circular contour of the steel drum, and can perform 360° continuous contact shaping on the outer surface of the steel drum. Compared with the traditional single-roller or multi-roller discrete support, it can apply radial pressure more evenly, effectively correct the ellipticity deviation, local depressions or protrusions after the steel plate is bent, ensure that the steel drum maintains a regular cylindrical shape, and improve the roundness qualification rate of the steel drum; the expanded ends can form limiting shoulders on both sides of the steel drum axially to prevent the steel drum from axially moving during the conveying or shaping process, ensure that the center of the steel drum is strictly aligned with the laser welding head, and improve the welding quality of the weld.
[0008] As a further improvement of this utility model, the driven wheel includes a rotating shaft, a hub is sleeved on the outer side of the rotating shaft, an arc-shaped groove is formed on the outer circumference of the hub, the rubber synchronous belt has a circular cross-section and is set in the arc-shaped groove, a limiting seat is provided on both sides of the hub, a rolling bearing is provided between the limiting seat and the rotating shaft, and a pressure cap is provided on the outer side of the limiting seat.
[0009] As a further improvement of this utility model, the connecting roller includes two mirror-symmetrical guide rollers. The center of each guide roller is provided with a axial through hole along its length. A central shaft is provided through the two axial through holes. The two ends of the central shaft are fixed to the frame by bearing seats. The guide roller includes several positioning steps. The diameter of the positioning steps gradually decreases from the outside to the inside. The connecting surface of two adjacent positioning steps is arc-shaped.
[0010] As a further improvement of this utility model, the second roller is located directly above the steel drum, and the first roller and the third roller are symmetrically distributed on both sides of the steel drum.
[0011] As a further improvement of this utility model, the laser welding head is mounted on the frame via a connecting seat. Attached Figure Description
[0012] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.
[0013] Figure 1 This is the front view of the present invention.
[0014] Figure 2 for Figure 1 Enlarged view of point A in the middle.
[0015] Figure 3 This is a cross-sectional view of the driven wheel in this utility model.
[0016] Figure 4 This is a three-dimensional structural diagram of the connecting roller in this utility model.
[0017] Among them, 1 is the first roller, 2 is the second roller, 3 is the third roller, 4 is the laser welding head, 5 is the frame, 6 is the driven roller, 7 is the connecting roller, 8 is the rotating shaft, 9 is the hub, 10 is the arc groove, 11 is the limit seat, 12 is the rolling bearing, 13 is the pressure cover, 14 is the guide wheel, 15 is the central shaft, 16 is the positioning step, 17 is the connecting surface, 18 is the steel barrel, 19 is the arc structure, 20 is the connecting shaft, 21 is the mounting seat, and 22 is the rubber synchronous belt. Detailed Implementation
[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0019] like Figure 1-4The steel drum shaping device shown includes a frame 5, on which a first roller 1, a second roller 2, and a third roller 3 are rotatably mounted. The first roller 1, the second roller 2, and the third roller 3 are arranged sequentially around the outer periphery of the steel drum 18 to form a continuous arc structure 19. The inner diameter of the arc is adapted to the outer diameter of the steel drum 18. The cross-sectional dimensions of the two ends of the first roller 1, the second roller 2, and the third roller 3 along their own axial direction are larger than the cross-sectional dimensions of the middle part, forming a contour structure that is expanded at both ends and contracted in the middle. A laser welding head 4 is arranged directly below the steel drum 18 and is mounted on the frame 5 through a connecting seat. The steel drum 18 moves horizontally backward under the drive of two conveyor belts. The conveyor belts include a geared motor, the output end of which is coaxially arranged with the drive wheel. The drive wheel is connected to the driven wheel 6 through a rubber synchronous belt 22. The driven wheel 6 is tangentially arranged with the steel drum 18. Connecting rollers 7 are arranged on the front side of the two driven wheels 6 and are in rolling connection with the steel drum 18.
[0020] In this embodiment, each end of the first roller 1, the second roller 2 and the third roller 3 is provided with a connecting shaft 20. The connecting shaft 20 is rotatably mounted on the mounting base 21 through bearings, and the mounting base 21 is fixed on the frame 5.
[0021] The driven wheel 6 includes a shaft 8, with a hub 9 fitted around its outer side. An arc-shaped groove 10 is formed on the outer periphery of the hub 9. The rubber timing belt 22 has a circular cross-section and is positioned within the arc-shaped groove 10. This design ensures the meshing accuracy between the timing belt and the driving wheel, and also adapts to minor fluctuations in the diameter of the steel drum 18 through elastic deformation, maintaining tangential contact with the drum 18. Compared to rectangular timing belts, the flexible contact of the circular rubber timing belt 22 reduces the risk of scratches on the surface of the steel drum 18, while its high elasticity buffers impacts during transport, preventing secondary deformation. Limit seats 11 are provided on both sides of the hub 9, and rolling bearings 12 are provided between the limit seats 11 and the rotating shaft 8. A pressure cover 13 is provided on the outer side of the limit seats 11. The axial constraint of the limit seats 11 ensures the coaxiality of the hub 9 and the rotating shaft 8, avoids the deviation of the synchronous belt track caused by the eccentric rotation of the hub 9, and ensures that the contact point between the driven wheel 6 and the steel barrel 18 is always stable on the center line, preventing the steel barrel 18 from moving axially. The outer pressure cover 13 fixes the limit seats 11 and the bearings with fasteners, preventing dust from entering and preventing the parts from loosening, thus extending the service life.
[0022] The connecting roller 7 includes two mirror-symmetrical guide rollers 14. The center of each guide roller 14 has a through hole along its length, and a central shaft 15 is inserted through the two through holes. The two ends of the central shaft 15 are fixed to the frame 5 by bearing seats. Each guide roller 14 includes several positioning steps 16. The diameter of each positioning step 16 gradually decreases from the outside to the inside, and the connecting surface 17 of two adjacent positioning steps 16 is arc-shaped. The symmetrical guide rollers 14 make synchronous contact with both sides of the steel drum 18 to form an invisible guide rail, which constrains the left and right swing of the steel drum 18 during conveying. In coordination with the enlarged contours at both ends of the front roller, the steel drum 18 is positioned omnidirectionally from the transverse to the longitudinal direction, avoiding weld misalignment caused by offset before welding. Multiple steps provide multiple levels of support points. Compared with a single cylindrical guide roller 14, the weight of the steel drum 18 can be distributed to multiple contact areas, avoiding indentation or thin-wall deformation caused by excessive local pressure. When the diameter of the steel drum 18 is between two steps, the arc-shaped connecting surface 17 of the outer step can provide a flexible transition to prevent impact from hard contact.
[0023] The second roller 2 is located directly above the steel drum 18, and the first roller 1 and the third roller 3 are symmetrically distributed on both sides of the steel drum 18. The radial forces exerted by the rollers on the steel drum 18 are equal in magnitude and opposite in direction, which can counteract the tendency of the steel drum 18 to tip over on one side due to material springback or initial bending, and ensure that the steel drum 18 is always in a vertical and centered state during the shaping process.
[0024] The advantages of this utility model are as follows: the first, second, and third rollers 3 form a continuous arc that matches the outer diameter of the steel drum 18, simulating the ideal cylindrical profile. The ellipticity deviation and local depressions / protrusions are dynamically corrected by uniform radial pressure, and the roundness qualification rate reaches more than 98%. The rubber synchronous belt 22 is embedded in the arc-shaped groove 10 of the driven wheel 6 to prevent derailment and ensure high meshing accuracy. With the constant speed control of the geared motor, the steel drum 18 moves backward at a uniform speed. The constant speed characteristics of the conveyor belt are coordinated with the laser welding parameters in real time, which can ensure uniform weld penetration and improve weld quality.
[0025] The above description of the embodiments is only for the purpose of helping to understand the structure and core idea of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.
Claims
1. A steel drum pre-welding shaping device, comprising a frame, characterized in that, The frame is rotatably equipped with a first roller, a second roller, and a third roller. The first roller, the second roller, and the third roller are arranged sequentially around the outer periphery of the steel drum to form a continuous arc structure. The inner diameter of the arc is adapted to the outer diameter of the steel drum. The cross-sectional dimensions of the two ends of the first roller, the second roller, and the third roller along their own axial direction are larger than the cross-sectional dimensions of the middle part, forming a contour structure that is expanded at both ends and contracted in the middle. A laser welding head is arranged directly below the steel drum. The steel drum moves horizontally backward under the drive of two conveyor belts. The conveyor belts include a geared motor. The output end of the geared motor is coaxially arranged with the drive wheel. The drive wheel is connected to the driven wheel through a rubber synchronous belt. The driven wheel is tangentially arranged with the steel drum. Connecting rollers are arranged on the front side of the two driven wheels. The connecting rollers are in rolling connection with the steel drum.
2. The steel drum pre-welding shaping device according to claim 1, characterized in that, The driven wheel includes a rotating shaft, a hub is sleeved on the outside of the rotating shaft, an arc-shaped groove is formed on the outer periphery of the hub, the rubber synchronous belt has a circular cross-section and is set in the arc-shaped groove, limit seats are provided on both sides of the hub, a rolling bearing is provided between the limit seat and the rotating shaft, and a pressure cap is provided on the outside of the limit seat.
3. The steel drum pre-welding shaping device according to claim 1, characterized in that, The connecting roller includes two mirror-symmetrical guide rollers. The center of each guide roller has a through hole along its length. A central shaft is inserted through each of the two through holes. The two ends of the central shaft are fixed to the frame by bearing seats. The guide roller includes several positioning steps. The diameter of each positioning step gradually decreases from the outside to the inside. The connecting surface of two adjacent positioning steps is arc-shaped.
4. The steel drum pre-welding shaping device according to claim 1, characterized in that, The second roller is located directly above the steel drum, and the first and third rollers are symmetrically distributed on both sides of the steel drum.
5. The steel drum pre-welding shaping device according to claim 1, characterized in that, The laser welding head is mounted on the frame via a connector.