Uniform stress forming device for thin-wall spiral welded pipe
By using a four-roller sizing structure and dynamic pressure control, the problem of local stress concentration during bending of thin-walled spiral welded pipes was solved, achieving uniform stress forming of steel strips and high-quality welding.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-02
- Publication Date
- 2026-03-10
AI Technical Summary
Existing forming machines are prone to localized stress concentration when bending 3mm thin-walled steel strips, resulting in excessive ovality of the steel pipe, affecting welding quality, and making it difficult to achieve uniform stress forming of thin-walled spiral welded pipes.
The four-roll sizing structure, combined with the bending plate roll pressing mechanism, vertical roll guide and tensioning device, achieves uniform stress forming of steel strip through a three-stage forming process and densely arranged forming roll group, including bending plate roll pressing, pre-bending, double roll bending and four-roll sizing, with dynamic pressure control and precise position adjustment.
It significantly improves welding quality, ensures that the steel strip maintains a stable geometric shape during bending, increases the forming qualification rate, eliminates local stress concentration, and realizes uniform stress forming of thin-walled spiral welded pipe.
Smart Images
Figure CN223981015U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of stress forming devices, specifically relating to a uniform stress forming device for thin-walled spiral welded pipes. Background Technology
[0002] Spiral welded pipe units are mainly used to produce welded steel pipes for water and gas transmission structures and oil and gas transmission pipelines, and are also used for coal mine gas transmission pipes.
[0003] Currently, the three-roll forming system of existing forming machines is prone to local stress concentration when bending 3mm thin-walled steel strips, causing the ovality of the steel pipe to exceed the standard and affecting the welding quality. In addition, the traditional 60mm thick No. 2 beam is difficult to balance the strength requirements and the passage space of the flux tube and welding wire tube. When bending the spiral welded pipe, the thin-walled spiral welded pipe in the existing technology is difficult to make the spiral welded pipe uniformly stressed and formed, which needs further improvement. Utility Model Content
[0004] In order to overcome the problem that it is difficult to uniformly stress and form thin-walled spiral welded pipes when bending them in the existing technology, a device for uniformly stress-forming thin-walled spiral welded pipes is proposed.
[0005] The technical solution of this utility model is as follows: a thin-walled spiral welded pipe uniform force forming device, including a base; the upper end of the base is provided with a first roller assembly mechanism, a second roller assembly mechanism, a third roller assembly mechanism, an external control roller assembly mechanism, a vertical roller assembly mechanism, a tensioning device assembly mechanism, a bending plate roller pressing mechanism, and a fourth roller assembly mechanism; the upper end of the base is provided with a bending plate roller pressing mechanism, a second roller assembly mechanism, and a third roller assembly mechanism for bending steel plates, and the upper end of the base is also provided with a first roller assembly mechanism, an external control roller assembly mechanism, a vertical roller assembly mechanism, and a tensioning device assembly mechanism, and the tensioning device assembly mechanism is also provided with a fourth roller assembly mechanism. After the bending plate roller pressing mechanism, the second roller assembly mechanism, and the third roller assembly mechanism bend the steel plate, the steel plate becomes cylindrical and its outer wall is in contact with the first roller assembly mechanism, the external control roller assembly mechanism, the vertical roller assembly mechanism, the tensioning device assembly mechanism, and the fourth roller assembly mechanism.
[0006] After the bending roll forming mechanism, the second roll forming mechanism, and the third roll forming mechanism bend the steel plate, the steel plate becomes cylindrical and its outer wall contacts the first roll forming mechanism, the external control roll forming mechanism, the vertical roll forming mechanism, the tensioning device forming mechanism, and the fourth roll forming mechanism to sizing the steel plate and finally forming the required steel pipe. This solves the problem in the existing technology that it is difficult to make the spiral welded pipe bend evenly stressed and formed when bending the spiral welded pipe.
[0007] Furthermore, the tensioning device assembly mechanism includes a vertical block, a third fixed seat, a second inclined plate, a third linear module, a fourth fixed seat, and a third pressure roller; the upper end of the base is fixedly connected to the vertical block, the side end of the vertical block is hinged to the output shaft of the third fixed seat, the fixed end of the third fixed seat is hinged to the second inclined plate, the lower end of the second inclined plate is fixedly connected to the third linear module, the lower end of the moving end of the third linear module is fixedly connected to the fourth fixed seat, and the third pressure roller is fixedly connected to the fourth fixed seat.
[0008] Furthermore, the third roller assembly mechanism includes a first linear module, a first fixed base, and a first pressure roller; the upper end of the base is fixedly connected to the first linear module, the upper end of the moving end of the first linear module is fixedly connected to the first fixed base, and the first pressure roller is fixedly connected to the first fixed base. The second roller assembly mechanism and the third roller assembly mechanism have the same structure.
[0009] Furthermore, the external control roller assembly mechanism includes a first motor, a first lead screw, a first threaded sleeve, a first inclined plate, a second linear module, a second fixed base, and a second pressure roller; a bracket is fixedly connected to the upper end of the base, a first motor is fixedly connected to the upper end of the bracket, a first lead screw is fixedly connected to the lower end of the output shaft of the first motor, a first threaded sleeve is threaded onto the side wall of the first lead screw, a first inclined plate is fixedly connected to the side end of the first threaded sleeve, a second linear module is fixedly connected to the side end of the first inclined plate, a second fixed base is fixedly connected to the lower end of the moving end of the second linear module, and a second pressure roller is fixedly connected to the second fixed base.
[0010] Furthermore, the bending plate rolling mechanism includes a fourth linear module, a fifth fixed seat, and a fourth pressure roller; the upper end of the base is fixedly connected to the fourth linear module, the upper end of the moving end of the fourth linear module is fixedly connected to the fifth fixed seat, and the fourth pressure roller is fixedly connected to the fifth fixed seat.
[0011] Furthermore, the bending roll pressing mechanism is located between the second roll assembly mechanism and the third roll assembly mechanism, and the second roll assembly mechanism and the third roll assembly mechanism are symmetrical about the bending roll pressing mechanism.
[0012] Furthermore, the first threaded sleeve is slidably mounted on the side wall of the support.
[0013] The beneficial effects of this utility model are:
[0014] 1. Through a three-stage forming process of pre-bending by a bending plate roller pressing mechanism, three-roll bending, and four-roll sizing, combined with the guiding and positioning of the vertical roller device, the steel strip maintains a stable geometric shape during continuous bending, which greatly improves the forming qualification rate and solves the problem in the existing technology that it is difficult to make the spiral welded pipe uniformly stressed and formed when bending the spiral welded pipe.
[0015] 2. The use of densely arranged 55mm spacing forming rollers (25mm shaft / 52mm outer diameter / 25mm width), combined with symmetrically arranged second and third roller assembly mechanisms, achieves uniform pressure on the steel strip in the entire circumference, effectively disperses the local stress concentration when the 3mm thin-walled steel strip is bent, and significantly improves the welding quality.
[0016] 3. The tensioning device assembly mechanism uses a third linear module to drive the third pressure roller, which can dynamically adjust the applied pressure in real time according to the thickness of the steel strip; the external control roller assembly mechanism realizes the micro-adjustment of the position of the second pressure roller through the first motor and the lead screw transmission, and works with the fourth linear module of the bending roller pressing mechanism to form a multi-dimensional pressure closed-loop control to ensure the accurate forming of steel strips with different wall thicknesses. Attached Figure Description
[0017] Figure 1 The diagram shown is a three-dimensional structural schematic of this utility model;
[0018] Figure 2 The diagram shown is a three-dimensional structural schematic of the external control roller assembly mechanism of this utility model.
[0019] Figure 3 The diagram shown is a three-dimensional cross-sectional view of the third roller assembly mechanism of this utility model.
[0020] Figure 4 The diagram shown is a three-dimensional structural schematic of the vertical roller assembly mechanism of this utility model.
[0021] Figure 5 The diagram shown is a three-dimensional structural schematic of the tensioning device assembly mechanism of this utility model.
[0022] The markings in the attached diagram are as follows: 1. Base; 2. First roller assembly mechanism; 3. Second roller assembly mechanism; 4. Third roller assembly mechanism; 41. First linear module; 42. First fixed seat; 43. First pressure roller; 5. External control roller assembly mechanism; 51. First motor; 52. First lead screw; 53. First lead sleeve; 54. First inclined plate; 55. Second linear module; 56. Second fixed seat; 57. Second pressure roller; 6. Vertical roller assembly mechanism; 7. Tensioning device assembly mechanism; 71. Vertical block; 72. Third fixed seat; 73. Second inclined plate; 74. Third linear module; 75. Fourth fixed seat; 76. Third pressure roller; 81. Fourth linear module; 82. Fifth fixed seat; 83. Fourth pressure roller; 9. Fourth roller assembly mechanism. Detailed Implementation
[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0024] Example 1: Please refer to Figures 1-5A uniformly stressed forming device for thin-walled spiral welded pipe includes a base 1; the upper end of the base 1 is provided with a first roller assembly mechanism 2, a second roller assembly mechanism 3, a third roller assembly mechanism 4, an external control roller assembly mechanism 5, a vertical roller assembly mechanism 6, a tensioning device assembly mechanism 7, a bending plate roller pressing mechanism, and a fourth roller assembly mechanism 9; the upper end of the base 1 is provided with a bending plate roller pressing mechanism, a second roller assembly mechanism 3, and a third roller assembly mechanism 4 for bending steel plates, and the upper end of the base 1 is also provided with a first roller assembly mechanism 2, an external control roller assembly mechanism 5, a vertical roller assembly mechanism 6, and a tensioning device assembly mechanism 7, and the tensioning device assembly mechanism 7 is also provided with a fourth roller assembly mechanism 9; after the bending plate roller pressing mechanism, the second roller assembly mechanism 3, and the third roller assembly mechanism 4 bend the steel plate, the steel plate becomes cylindrical and its outer wall is in contact with the first roller assembly mechanism 2, the external control roller assembly mechanism 5, the vertical roller assembly mechanism 6, the tensioning device assembly mechanism 7, and the fourth roller assembly mechanism 9.
[0025] After the bending plate roll forming mechanism, the second roll assembly mechanism 3, and the third roll assembly mechanism 4 bend the steel plate, the steel plate becomes cylindrical and its outer wall contacts the first roll assembly mechanism 2, the external control roll assembly mechanism 5, the vertical roll assembly mechanism 6, the tensioning device assembly mechanism 7, and the fourth roll assembly mechanism 9 to sizing the steel plate and finally forming the required steel pipe. By setting the first roll assembly mechanism 2, the second roll assembly mechanism 3, the third roll assembly mechanism 4, and the fourth roll assembly mechanism 9 to form a four-roll sizing structure, combined with the pre-bending function of the bending plate roll forming mechanism, a three-stage progressive forming process is realized. This multi-stage forming method allows the steel strip to gradually form a standard roundness under the guidance of the vertical roll assembly mechanism 6, effectively avoiding the problem of excessive ellipticity when forming thin-walled steel strips.
[0026] Please see Figure 1 and Figure 5 In this embodiment, the tensioning device assembly mechanism 7 includes a stand block 71, a third fixed seat 72, a second inclined plate 73, a third linear module 74, a fourth fixed seat 75, and a third pressure roller 76. The upper end of the base 1 is fixedly connected to the stand block 71, and the side end of the stand block 71 is hinged to the output shaft of the third fixed seat 72. The fixed end of the third fixed seat 72 is hinged to the second inclined plate 73, the lower end of the second inclined plate 73 is fixedly connected to the third linear module 74, the lower end of the moving end of the third linear module 74 is fixedly connected to the fourth fixed seat 75, and the third pressure roller 76 is fixedly connected to the fourth fixed seat 75. The design of the third linear module 74 driving the third pressure roller 76, combined with the hinged third fixed seat 72 and the second inclined plate 73 structure, allows for real-time adjustment of the clamping force of the third pressure roller 76 during the steel plate forming process. This dynamic adjustment function can effectively compensate for the elastic deformation differences of steel strips of different thicknesses, ensuring balanced pressure during the forming process.
[0027] Please see Figure 1 and Figure 3In this embodiment, the third roller assembly mechanism 4 includes a first linear module 41, a first fixed seat 42, and a first pressure roller 43. The upper end of the base 1 is fixedly connected to the first linear module 41, the upper end of the moving end of the first linear module 41 is fixedly connected to the first fixed seat 42, and the first pressure roller 43 is fixedly connected to the first fixed seat 42. The second roller assembly mechanism 3 and the third roller assembly mechanism 4 have the same structure. The lifting stroke of the first pressure roller 43 is controlled by the first linear module 41. Combined with the symmetrical layout of the second roller assembly mechanism 3, a double-sided synchronous pressure structure is formed. This symmetrical pressure method can eliminate the torsional stress generated when the steel strip is bent on one side, and is particularly suitable for the uniform forming of thin-walled materials below 3mm.
[0028] Please see Figure 1 and Figure 2 In this embodiment, the external control roller assembly mechanism 5 includes a first motor 51, a first lead screw 52, a first threaded sleeve 53, a first inclined plate 54, a second linear module 55, a second fixed base 56, and a second pressure roller 57. A bracket is fixedly connected to the upper end of the base 1, and the first motor 51 is fixedly connected to the upper end of the bracket. The first lead screw 52 is fixedly connected to the lower end of the output shaft of the first motor 51. A first threaded sleeve 53 is threaded onto the side wall of the first lead screw 52, and a first inclined plate 54 is fixedly connected to the side end of the first threaded sleeve 53. A second linear module 55 is fixedly connected to the side end of 4. A second fixed seat 56 is fixedly connected to the lower end of the moving end of the second linear module 55. A second pressure roller 57 is fixedly connected to the second fixed seat 56. The first motor 51 drives the first lead screw 52 to realize the vertical position adjustment of the second pressure roller 57. Combined with the horizontal displacement control of the second linear module 55, a dual-axis linkage adjustment system is formed. This structure realizes the roller position fine adjustment with a precision of ±0.1mm through the inclined surface transmission of the first inclined plate 54, and accurately controls the forming curvature.
[0029] Please see Figure 1 and Figure 5 In this embodiment, the bending roll forming mechanism includes a fourth linear module 81, a fifth fixed base 82, and a fourth pressure roller 83. The upper end of the base 1 is fixedly connected to the fourth linear module 81, and the upper end of the moving end of the fourth linear module 81 is fixedly connected to the fifth fixed base 82. The fourth pressure roller 83 is fixedly connected to the fifth fixed base 82. The fourth pressure roller 83 driven by the fourth linear module 81 serves as the core component for pre-bending, forming a golden triangle layout with the second roller assembly mechanism 3 and the third roller assembly mechanism 4. This geometric configuration enables the steel plate to obtain a 120° arc surface pre-formation in the initial bending stage, laying a precise curvature foundation for the subsequent four-roll sizing.
[0030] Please see Figure 1 and Figure 5In this embodiment, the bending plate rolling mechanism is located between the second roller assembly mechanism 3 and the third roller assembly mechanism 4. The second roller assembly mechanism 3 and the third roller assembly mechanism 4 are symmetrical about the bending plate rolling mechanism. The second roller assembly mechanism 3 and the third roller assembly mechanism 4 are mirror symmetrical about the bending plate rolling mechanism. Together with the forming roller group arranged at 55mm intervals, a circumferentially uniform 12-point pressure distribution is formed. This dense roller design can improve the traditional three-point bending into full circumferential progressive pressure, completely eliminating the phenomenon of local stress concentration.
[0031] Please see Figure 1 and Figure 2 In this embodiment, the first thread sleeve 53 is slidably disposed on the side wall of the bracket. The sliding fit design between the first thread sleeve 53 and the side wall of the bracket can ensure the absolute stability of the roller position during the molding process.
[0032] Working principle: After the steel strip enters the device through the delivery machine, it is first driven by the fourth linear module 81 of the bending roller mechanism to perform a 120° pre-bending process on the fourth pressure roller 83 to form the initial curvature.
[0033] Then it enters the three-roll bending system composed of the second roll assembly mechanism 3 and the third roll assembly mechanism 4. The two drive the first pressure roller 43 synchronously through the symmetrically arranged first straight module 41 to apply uniform pressure on both sides of the steel strip. Combined with the guiding and positioning of the vertical roll assembly mechanism 6, the steel strip is gradually bent into a cylindrical shape.
[0034] The outer wall of the bent steel strip comes into contact with the third pressure roller 76 of the first roller assembly mechanism 2, the external control roller assembly mechanism 5, the tensioning device assembly mechanism 7, and the fourth roller assembly mechanism 9 in sequence, forming a four-roller sizing structure.
[0035] During this process, the first motor 51 of the external control roller assembly mechanism 5 drives the first lead screw 52 to adjust the position of the first lead sleeve 53, and transmits the second linear module 55 through the first inclined plate 54 to realize the ±0.1mm level fine adjustment and horizontal displacement compensation of the second pressure roller 57;
[0036] The third linear module 74 of the tensioning device assembly mechanism 7 drives the third pressure roller 76 through the second inclined plate 73 to dynamically adjust the clamping force and compensate for the difference in elastic deformation of steel strips of different thicknesses.
[0037] Meanwhile, the symmetrical layout of the second roller assembly mechanism 3 and the third roller assembly mechanism 4, together with the dense forming roller group with a 55mm spacing, forms a circumferentially uniform 12-point pressure distribution, completely eliminating local stress concentration. Finally, the steel strip is precisely formed into a thin-walled spiral welded pipe that meets the requirements through multi-stage progressive forming and dynamic pressure closed-loop control.
Claims
1. A uniform stress forming device for thin-walled spiral welded pipes, comprising a base (1); characterized in that: The upper end of the base (1) is provided with a first roller assembly mechanism (2), a second roller assembly mechanism (3), a third roller assembly mechanism (4), an external control roller assembly mechanism (5), a vertical roller assembly mechanism (6), a tensioning device assembly mechanism (7), a plate bending roller pressing mechanism and a fourth roller assembly mechanism (9); the upper end of the base (1) is provided with the plate bending roller pressing mechanism, the second roller assembly mechanism (3) and the third roller assembly mechanism (4) for bending the steel plate, and the upper end of the base (1) is further provided with the first roller assembly mechanism (2), the external control roller assembly mechanism (5), the vertical roller assembly mechanism (6) and the tensioning device assembly mechanism (7), and the fourth roller assembly mechanism (9) is further provided on the tensioning device assembly mechanism (7); after the plate bending roller pressing mechanism, the second roller assembly mechanism (3) and the third roller assembly mechanism (4) bend the steel plate, the steel plate is in a cylindrical shape and its outer wall is in contact with the first roller assembly mechanism (2), the external control roller assembly mechanism (5), the vertical roller assembly mechanism (6), the tensioning device assembly mechanism (7) and the fourth roller assembly mechanism (9).
2. The uniform stress forming device for thin wall spiral welded pipe as claimed in claim 1 wherein: The tensioning device assembly mechanism (7) comprises a vertical block (71), a third fixed seat (72), a second inclined plate (73), a third linear module (74), a fourth fixed seat (75) and a third pressing wheel (76); the upper end of the base (1) is fixedly connected with the vertical block (71), the side end of the vertical block (71) is hingedly connected with the output shaft of the third fixed seat (72), the fixed end of the third fixed seat (72) is hingedly connected with the second inclined plate (73), the lower end of the second inclined plate (73) is fixedly connected with the third linear module (74), the moving end of the third linear module (74) is fixedly connected with the fourth fixed seat (75), and the fourth fixed seat (75) is fixedly connected with the third pressing wheel (76).
3. The uniform stress forming device for thin wall spiral welded pipe as claimed in claim 1 wherein: The third roller assembly mechanism (4) comprises a first linear module (41), a first fixed seat (42) and a first pressing wheel (43); the upper end of the base (1) is fixedly connected with the first linear module (41), the upper end of the moving end of the first linear module (41) is fixedly connected with the first fixed seat (42), and the first fixed seat (42) is fixedly connected with the first pressing wheel (43); the second roller assembly mechanism (3) and the third roller assembly mechanism (4) have the same structure.
4. The uniform stress forming device for thin wall spiral welded pipe as claimed in claim 1 wherein: The external control roller assembly mechanism (5) comprises a first motor (51), a first lead screw (52), a first lead screw sleeve (53), a first inclined plate (54), a second linear module (55), a second fixed seat (56) and a second pressing wheel (57); the upper end of the base (1) is fixedly connected with a support, the upper end of the support is fixedly connected with the first motor (51), the lower end of the output shaft of the first motor (51) is fixedly connected with the first lead screw (52), the side wall of the first lead screw (52) is threadedly connected with the first lead screw sleeve (53), the side end of the first lead screw sleeve (53) is fixedly connected with the first inclined plate (54), the side end of the first inclined plate (54) is fixedly connected with the second linear module (55), the moving end of the second linear module (55) is fixedly connected with the second fixed seat (56), and the second fixed seat (56) is fixedly connected with the second pressing wheel (57).
5. The uniform stress forming device for thin wall spiral welded pipe as claimed in claim 1 wherein: The bending plate roller pressing mechanism comprises a fourth linear module (81), a fifth fixed base (82) and a fourth pressing wheel (83); the upper end of the base (1) is fixedly connected with the fourth linear module (81), the upper end of the moving end of the fourth linear module (81) is fixedly connected with the fifth fixed base (82), and the fifth fixed base (82) is fixedly connected with the fourth pressing wheel (83).
6. The uniform stress forming device for thin wall spiral welded pipe as claimed in claim 1 wherein: The bending plate roller pressing mechanism is located between the second roller assembly mechanism (3) and the third roller assembly mechanism (4), and the second roller assembly mechanism (3) and the third roller assembly mechanism (4) are mutually symmetrical about the bending plate roller pressing mechanism.
7. The uniform stress forming device for thin wall spiral welded pipe as claimed in claim 4 wherein: The first wire sleeve (53) is slidably arranged on the side wall of the support.