Bridge welding displacement device for large-span arch rib

Abstract

This invention provides a bridge welding displacement device for long-span arch ribs, comprising a base, a bearing seat, a calibration component, and a welding unit. The calibration component includes two fixing rings for respectively fitting onto a reference steel pipe and a splicing steel pipe. One fixing ring has multiple guide sleeves on its outer peripheral wall, and the other fixing ring has multiple butt joint rods on its outer peripheral wall. During the process of the splicing steel pipe moving towards the reference steel pipe for docking, the multiple butt joint rods are inserted into the multiple guide sleeves to ensure that the central axes of the reference steel pipe and the splicing steel pipe coincide. The welding unit is used to weld the splice joint between the reference steel pipe and the splicing steel pipe. The bridge welding displacement device for long-span arch ribs provided by this invention effectively solves the problem in existing technologies where, during hoisting, the steel pipes are prone to attitude deviation due to external load disturbances, requiring repeated manual repositioning and correction, which increases the time required for splicing operations and reduces construction efficiency.

Description

Technical Field

[0001] This invention relates to the field of bridge construction technology, specifically to a bridge welding displacement device for long-span arch ribs. Background Technology

[0002] In the field of large-scale bridge construction, the arch rib structure, as a core load-bearing component, directly determines the overall load-bearing capacity, structural stability, and service life of the bridge through its construction quality. With the continuous development of long-span bridge construction technology, to meet the limitations of long-distance transportation and on-site large-scale hoisting equipment capabilities, the arch ribs of long-span bridges generally adopt a construction process of on-site assembly of segmented steel pipe components. These arch rib steel pipe segments are typically prefabricated in specialized factories, effectively ensuring their straightness or design curvature accuracy. Furthermore, the individual steel pipe segments possess high structural rigidity, making them less prone to overall plastic deformation under conventional hoisting and storage conditions, thus providing a good geometric foundation for subsequent on-site assembly operations.

[0003] In the on-site assembly and construction of steel pipe arch ribs, the welding process is a crucial and core step in the formation of the arch ribs. Its welding precision, weld quality, and construction efficiency have a decisive impact on the overall construction progress and quality control of the project. Specifically, the welding operation requires precise coaxial alignment and positioning between the reference steel pipe and the splicing steel pipe, and flexible adjustment of the welding station based on the spatial location of the weld to ensure the continuous and smooth implementation of the welding operation and that the final weld quality meets the design specifications.

[0004] Currently, existing technologies for on-site welding of arch-ribbed steel pipes mostly employ a construction method that combines simple support fixtures with hoisting equipment. The typical operation process involves suspending the spliced ​​steel pipes using hoisting equipment (such as truck cranes, crawler cranes, or bridge cranes). Operators adjust the spatial orientation of the spliced ​​steel pipes visually or with auxiliary measuring tools. Once the pipe is initially aligned with the fixed reference pipe opening, welders use handheld welding torches or fixed welding mechanisms to complete the butt weld. However, this existing technology has significant drawbacks in practical engineering applications: due to the enormous self-weight of the arch-ribbed steel pipes, they are easily disturbed by external environmental loads (such as wind force and the inertial force of sling swing) during hoisting, resulting in random spatial orientation shifts. Relying solely on the lifting and luffing mechanisms of the hoisting equipment makes it difficult to achieve high-precision coaxial alignment between the spliced ​​steel pipe and the reference pipe, easily leading to quality defects such as pipe wall misalignment and pipe opening misalignment at the butt joint, directly affecting the weld's load-bearing capacity and fatigue life. In addition, due to insufficient hoisting and positioning accuracy, the construction process often requires frequent manual intervention for repeated alignment and correction operations. This manual correction process not only significantly prolongs the time spent on positioning and correction of a single circumferential weld, severely restricting the overall construction efficiency of the arch rib assembly, but also requires correction workers to work at close range around the suspended large steel pipes, posing a high risk of construction safety such as being struck or crushed by objects, which does not meet the strict requirements of modern bridge construction for safe and civilized construction.

[0005] Therefore, it is necessary to provide a novel welding alignment device and construction method for arch rib steel pipes to solve the technical problems existing in the prior art, such as low alignment accuracy, poor construction efficiency, high safety risks, and difficulty in line control, so as to meet the high-precision, high-efficiency, and high-safety welding construction requirements of arch ribs for long-span bridges. Summary of the Invention

[0006] The problem solved by this invention is to provide a bridge welding displacement device for long-span arch ribs, which can effectively solve the problem in the prior art that the posture deviation is easily caused by external load disturbance during hoisting, requiring repeated manual intervention for alignment correction, which increases the time consumption of splicing operations between steel pipes and reduces construction efficiency.

[0007] To solve the aforementioned problems, the present invention provides a bridge welding displacement device for long-span arch ribs, including a base, on which a bearing seat is provided for supporting and limiting the reference steel pipe; The calibration component includes two fixing rings for respectively fitting onto the outside of a reference steel pipe and a spliced ​​steel pipe. One of the fixing rings has multiple guide sleeves on its outer peripheral wall, and the other fixing ring has multiple docking rods on its outer peripheral wall. During the process of the spliced ​​steel pipe moving and docking with the reference steel pipe, the multiple docking rods are respectively inserted into the multiple guide sleeves so that the central axis of the reference steel pipe and the spliced ​​steel pipe coincides. A welding unit, installed on the base, is used to weld the joint between the reference steel pipe and the splicing steel pipe.

[0008] Furthermore, the guide sleeve includes a tapered guide correction section and a cylindrical docking section, the small diameter section of the guide correction section is connected to one end of the docking section, and the aperture of the docking section matches the diameter of the docking rod.

[0009] Furthermore, the welding unit includes a movable frame and a welding head mounted on the movable frame. The base is provided with a first annular frame fitted outside the fixed ring. Between the first annular frame and the movable frame, there is a drive unit for driving the movable frame to move in a circular motion around the central axis of the reference steel pipe, and the welding head corresponds to the splice seam.

[0010] Furthermore, the drive unit includes a drive motor mounted on a movable frame, a drive gear connected to the drive motor's power shaft, and a transmission gear ring on the first annular frame, with the drive gear meshing with the transmission gear ring.

[0011] Furthermore, the base is also provided with a second annular frame fitted outside the other fixed ring. The second annular frame and the first annular frame are both provided with annular guide grooves on their adjacent end faces. Both ends of the movable frame are provided with guide rings for slidingly engaging in the two guide grooves respectively.

[0012] Furthermore, multiple docking rods are axially telescopically connected to corresponding fixed rings. An actuator is provided at one end of the movable frame near the docking rods. During the circumferential rotation of the movable frame, the actuator is used to sequentially drive each docking rod to move axially toward the end away from the guide sleeve until the splice seam corresponding to each docking rod is sequentially exposed inside the welding head.

[0013] Furthermore, the actuator is an arc-shaped extrusion block, and the thickness of the extrusion block gradually increases along the rotation direction of the movable frame. Each of the docking rods has a guide groove on its outer wall away from the center of the fixed ring, and the length of the guide groove is greater than the maximum thickness of the extrusion block. The outer peripheral wall of the fixed ring for installing the docking rods is provided with multiple positioning ear plates protruding outward. Each docking rod is slidably inserted into its corresponding positioning ear plate, and the positioning ear plate or the fixed ring is provided with a limiting member for limiting the axial position of the docking rod. In the initial state, one end of the docking rod away from the guide sleeve is exposed on the positioning ear plate, and the length of the guide groove on the part of the docking rod exposed on the positioning ear plate is slightly greater than the minimum thickness of the extrusion block. During the circumferential rotation of the movable frame, the radial inner side of the extrusion block slides sequentially from the smallest thickness to the largest thickness position across the guide groove of each docking rod away from the guide sleeve, thereby sequentially driving each docking rod to move axially.

[0014] Furthermore, the limiting component is a spring that is slidably fitted onto the outside of the docking rod. One end of the spring is fixedly connected to the docking rod, and the other end is fixedly connected to the end of the positioning ear plate near the guide sleeve. When the docking rod is in the initial position, the spring is in a free state without force.

[0015] In summary, the bridge welding displacement device for long-span arch ribs of the present invention has the following advantages compared with the prior art: This invention includes a calibration component. The guiding mechanism within the calibration component comprises positioning support plates and docking tubes arranged in a circumferential array along a fixed ring. The inner cavity of the docking tube is composed of a tapered guiding and correcting section connected to a cylindrical docking section. The inner diameter of the larger end of the guiding and correcting section is much larger than the outer diameter of the docking rod, while the smaller end has the same inner diameter as the docking section. The docking mechanism is equipped with positioning lugs arranged in a circumferential array along the fixed ring, a docking rod with a spherical end, and elastic limiting components. When the spliced ​​steel pipe moves towards the reference steel pipe, the docking rod first enters the tapered correcting section of the guiding sleeve, automatically correcting its spatial position with the aid of the tapered surface guidance. Multiple sets of docking rods and the guiding sleeve work together to force the reference steel pipe and the spliced ​​steel pipe to dock. The central axes of the pipes coincide, eliminating the need for repeated manual adjustments and achieving precise coaxial connection between the reference steel pipe and the splicing steel pipe, thus avoiding misalignment of the splicing seam. On the other hand, the extrusion block is assembled on the outside of the movable frame, with its thickness increasing along the rotation direction. During welding, the extrusion block contacts the guide groove of the docking rod before the welding head. As the movable frame moves, the increasingly thick extrusion block applies an axial driving force to the docking rod. When the driving force exceeds the spring preload, the docking rod slides away from the guide sleeve, avoiding the welding path and ensuring no interference during full welding. After the welding head passes, the extrusion block disengages from the guide groove, and the docking rod resets and embeds into the guide sleeve under the action of the spring force.

[0016] Other improvements and advantages of this application will be set forth in the following detailed description and will be apparent in part from the specification or may be learned by practicing the application. The objectives and other advantages of this application may be realized and obtained through the structures particularly pointed out in the specification and drawings. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of an embodiment of the present invention; Figure 2 This is a cross-sectional view of the ring frame according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the three-dimensional separation structure of the welding unit according to an embodiment of the present invention; Figure 4 This is an embodiment of the present invention. Figure 3 A magnified structural diagram of part A in the middle; Figure 5 This is a schematic diagram of the three-dimensional separation structure of the guiding mechanism according to an embodiment of the present invention; Figure 6 This is an embodiment of the present invention. Figure 5 A magnified structural diagram of section B in the middle; Figure 7 This is a schematic diagram of the three-dimensional separation structure of the docking mechanism according to an embodiment of the present invention; Figure 8 This is a schematic diagram of the three-dimensional transformation structure of the extrusion block according to an embodiment of the present invention.

[0018] Explanation of reference numerals in the attached figures: 1. Base; 2. Reference steel pipe; 3. Spliced ​​steel pipe; 4. Bearing seat; 5. Welding unit; 51. First ring frame; 511. Transmission gear ring; 52. Guide slide; 53. Movable frame; 54. Welding head; 55. Drive unit; 551. Drive motor; 552. Drive gear; 56. Extrusion block; 6. Calibration component; 61. Fixing ring; 62. Guide mechanism; 621. Positioning support plate; 622. Guide sleeve; 6221. Guide correction section; 6222. Docking section; 63. Docking mechanism; 631. Positioning ear plate; 632. Docking rod; 633. Guide slot; 634. Limiting component. Detailed Implementation

[0019] First, those skilled in the art should understand that these embodiments are merely used to explain the technical principles of the embodiments of this application and are not intended to limit the scope of protection of the embodiments of this application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0020] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of these terms in the embodiments of this application based on the specific circumstances.

[0021] In the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0022] like Figures 1-8 As shown, the present invention provides a bridge welding displacement device for long-span arch ribs, which includes a base 1, which is a horizontal mounting plate. The base 1 is equipped with a bearing seat 4 for supporting the reference steel pipe 2 and a welding unit 5 for welding the splice seam between the reference steel pipe 2 and the splice steel pipe 3. After the reference steel pipe 2 is positioned on the bearing seat 4 at a set position, the splice steel pipe 3 is moved to a position where one end of the splice steel pipe 3 is aligned with one end of the reference steel pipe 2 at an angle that coincides with the central axis by a special hoisting device. The welding unit 5 is used to weld the splice seam between the two steel pipes. The system also includes a calibration component 6, which comprises fixing rings 61 for respectively fitting onto the reference steel pipe 2 and the spliced ​​steel pipe 3. In this embodiment, a clamp structure is preferred. The two clamping rings of the clamp structure can be fastened to the outer surfaces of the spliced ​​steel pipe 3 and the reference steel pipe 2 by bolts, making disassembly and assembly convenient and requiring no complicated tools. One of the fixing rings 61 is provided with a guide mechanism 62, which includes multiple guide sleeves 622 arranged circumferentially on the outer side of the corresponding fixing ring 61. The other fixing ring 61 is provided with a docking mechanism 63, which includes multiple docking rods 632 arranged circumferentially on the outer side of the corresponding fixing ring 61. During the process of the spliced ​​steel pipe 3 moving and docking with the reference steel pipe 2, the multiple docking rods 632 are respectively inserted into the multiple corresponding guide sleeves 622, so that the central axis of the reference steel pipe 3 and the spliced ​​steel pipe 2 can be quickly aligned and coincided, and welding can be carried out without repeatedly adjusting the hoisting equipment, effectively improving welding efficiency.

[0023] In this embodiment, the following example is used: a guide mechanism 62 is provided on the fixing ring 61 outside the reference steel pipe 2, and a docking mechanism 63 is provided on the fixing ring 61 outside the splicing steel pipe 3.

[0024] Preferably, the guide sleeve 622 includes a tapered guide correction section 6221 and a cylindrical docking section 6222. The small-diameter section of the guide correction section 6221 is connected to one end of the docking section 6222, and the aperture of the docking section 6222 matches the diameter of the docking rod 632. Furthermore, in this structure, the ends of each docking rod 632 that connect with the guide sleeve 622 are ball-head structures. The inner cavity of the guide sleeve 622 adopts a segmented structure design, consisting of the guide correction section 6221 and the cylindrical docking section 6222 connected to form an integrated guide channel. The inner diameter of the large end of the guide correction section 6221 is much larger than the outer diameter of the docking rod 632, while the inner diameter of the small end is the same as the inner diameter of the docking section 6222. When the end of the docking rod 632 enters the guide correction section 6221, the spatial position of the docking rod 632 is automatically corrected by the guiding effect of the tapered surface until its central axis coincides with the central axis of the guide sleeve 622.

[0025] In this embodiment, more specifically, multiple positioning support plates 621 are provided on the outer peripheral wall of the fixing ring 61 outside the reference steel pipe 2, and each positioning support plate 621 is provided with an installation hole, and each guide sleeve 622 is inserted and fitted into the corresponding installation hole.

[0026] In this embodiment, as Figure 3 As shown, the welding unit 5 includes a movable frame 53 and a welding head 54 mounted on the movable frame 53. A first annular frame 51, fitted onto the outside of a fixed ring 61, is mounted on the base 1. A drive unit 55, for driving the movable frame 53 to rotate around the central axis of the reference steel pipe 2, is located between the first annular frame 51 and the movable frame 53. Specifically, the drive unit 55 includes a drive motor 551 mounted on the movable frame 53. A drive gear 552 is connected to the power shaft of the drive motor 551. A transmission gear ring 511 is mounted on the first annular frame 51, and the drive gear 552 meshes with the transmission gear ring 511.

[0027] like Figure 4 As shown, an annular mounting groove (not shown in the figure) is recessed on the end face of the first annular frame 51 near the movable frame 53. The transmission gear ring 511 is disposed on the radial inner side wall of the annular mounting groove. The drive gear 552 is engaged in the annular mounting groove, with one side meshing with the transmission gear ring 511 and the other side leaving a small gap between it and the radial outer side wall of the annular mounting groove.

[0028] In addition, in order to ensure that the movable frame 53 can make a smooth circular motion around the central axis of the reference steel pipe 2, a second annular frame (not shown in the figure) is also provided on the base 1 and fitted outside another fixed ring 61. The second annular frame and the first annular frame 51 are provided with annular guide grooves 52 on their adjacent end faces. Both ends of the movable frame 53 are provided with guide rings for sliding and fitting in the two guide grooves 52 respectively.

[0029] In this embodiment, during the circumferential welding of steel pipes, the operator uses an external hoisting unit (such as a bridge crane, a cantilever crane, or any other type) to hoist the reference steel pipe 2 onto the bearing seat 4 inside the base 1, thus completing the initial positioning of the reference steel pipe 2. It is worth noting that the top of the bearing seat 4 is provided with a semi-circular arc-shaped positioning groove that matches the outer circumference of the reference steel pipe 2. This allows the central axis of the reference steel pipe 2 to be aligned with the central axis of the first annular frame 51 inside the welding unit 5 after it is seated, providing a precise reference for the subsequent docking and assembly of the spliced ​​steel pipes 3.

[0030] More specifically, a translation unit is also provided on the base 1 to drive the bearing seat 4 to move horizontally on the base 1. After the reference steel pipe 2 is positioned, the translation unit on the base 1 is in the initial position and does not drive the bearing seat 4 to feed. At this time, the distance between the end face of the reference steel pipe 2 to be welded and the first annular frame 51 is at its maximum, reserving sufficient operating space for the subsequent assembly of the clamps. The translation unit here is existing technology and includes a linear guide rail assembly and a drive cylinder. The bearing seat 4 is slidably connected to the base 1 through a linear slide rail, and the drive cylinder is used to drive the bearing seat 4 to translate.

[0031] During assembly, the operator completes the assembly of two sets of clamps: one set of clamps is fastened to the welding end of the reference steel pipe 2 with bolts, and the other set of clamps is fastened to the butt joint end of the splicing steel pipe 3. After the clamps are assembled, the translation unit drives the bearing seat 4 and the reference steel pipe 2 to move towards the first annular frame 51 at a constant speed until they reach the preset welding position. It is worth noting that the preset position is accurately positioned by the feedback signal of the laser positioning sensor or limit switch. At this time, the welding end face of the reference steel pipe 2 is aligned with the working plane of the welding head 54 in the first annular frame 51. At the same time, the inner diameter of the first annular frame 51 is much larger than the outer diameter of the reference steel pipe 2, and the entrance of the first annular frame 51 is provided with a transition chamfer, which can effectively avoid rigid collision between the steel pipe and the first annular frame 51 during the feeding process and prevent secondary adjustments caused by the axial displacement of the reference steel pipe 2.

[0032] After the reference steel pipe 2 is in place, the external hoisting unit lifts the spliced ​​steel pipe 3 to the docking area and slowly moves it towards the reference steel pipe 2. It is worth noting that after the clamp assembly including the docking rod 632 is completed, the extension length of the docking rod 632 exceeds the docking end face of the spliced ​​steel pipe 3. This ensures that before the spliced ​​steel pipe 3 contacts the end face of the reference steel pipe 2, the docking rod 632 has already entered the effective working range of the guide sleeve 622, providing a prerequisite for axis pre-correction. When the end of the docking rod 632 enters the guide correction section 6221, the spatial position of the docking rod 632 is automatically corrected by the guiding effect of the conical surface until its central axis coincides with the central axis of the guide sleeve 622. Since the docking rods 632 are arranged in an equiangular array along the circumference of the clamp, the specific number of docking rods 632 in this invention can be selected according to the actual docking conditions. Here, four sets are selected. Through the coordinated guidance of multiple sets of docking rods 632 and guide sleeves 622, the axis of the reference steel pipe 2 and the splicing steel pipe 3 can be aligned with high precision simultaneously without repeated manual adjustment, which greatly improves the docking efficiency.

[0033] It is worth noting that when the docking rod 632 initially enters the docking section 6222, the end faces of the reference steel pipe 2 and the splicing steel pipe 3 still maintain a gap. As the external hoisting unit continues to feed, the docking rod 632 is fully embedded in the docking section 6222. At this time, the end faces of the reference steel pipe 2 and the splicing steel pipe 3 are tightly fitted together, forming a uniform circumferential welding bevel, thus completing the docking process.

[0034] For splicing steel pipe segments, as long as precise coaxial alignment of the mating ends is achieved, the manufacturing precision of the steel pipes themselves can ensure the continuity and overlap of the overall axis of the two segments. This invention constructs multiple collaborative guiding mechanisms by assembling calibration components 6 on the outer surfaces of the reference steel pipe 2 and the splicing steel pipe 3. The conical guide automatically corrects the spatial position, and multiple sets of mating rods 632 and guide sleeves 622 work together to force the central axes of the reference steel pipe 2 and the splicing steel pipe 3 to coincide. The calibration component 6 adopts a clamp-type design, which can be fastened to the outer surface of the steel pipe with bolts, making disassembly and assembly convenient and requiring no complex tools. The positioning of the reference steel pipe 2 relies on the arc groove of the bearing seat 4 and the automatic feeding of the translation unit. The docking of the splicing steel pipe 3 is achieved with the guidance of the hoisting unit and the calibration component 6, eliminating the need for repeated manual adjustments.

[0035] After docking is completed, the operator starts the drive motor 551 built into the movable frame 53. The drive gear 552 at the output end of the drive motor 551 meshes with the transmission gear ring 511 on the inner side of the first annular frame 51, driving the movable frame 53 to make uniform circular motion along the first annular frame 51. During the circular motion of the movable frame 53, the welding unit 5 inside the movable frame 53, equipped with a welding head 54, first performs positioning spot welding on the circumferential bevel to temporarily fix the reference steel pipe 2 and the splicing steel pipe 3. The spot welds are evenly distributed along the circumference. After the spot welding is completed, the welding head 54 returns to the initial working position and starts the full welding process. It is worth noting that each time the welding head 54 moves to the position of the docking rod 632, the lifting unit will drive the welding head 54 to return to the initial position, that is, a safety gap is reserved between the welding head 54 and the docking rod 632 to avoid motion interference during the circular motion of the movable frame 53 and ensure the continuous and stable welding process.

[0036] In this embodiment, the process is seamlessly connected by the cooperation of the translation unit, the bearing seat 4 and the calibration component 6: after the reference steel pipe 2 is initially positioned by the bearing seat 4, the translation unit drives it to be precisely fed to the preset welding position. Then the splicing steel pipe 3 is directly coaxially connected by the calibration component 6. After the connection is completed, the welding unit 5 can be started to perform welding operations without additional adjustment.

[0037] Furthermore, during the full welding process, because the butt joint rods 632 are arranged in an angular array along the circumferential direction of the clamps at the three ends of the spliced ​​steel pipe, after the butt joint rods 632 are fully embedded in the guide sleeve 622, the butt joint rods 632 will extend to the circumferential butt weld area of ​​the two steel pipes, forming a rigid blocking structure distributed along the circumference of the weld. When the welding head 54 moves at a uniform speed along the first annular frame 51 with the movable frame 53, it needs to achieve full circumferential coverage of the circumferential weld. When the welding head 54 moves to the position of the butt joint rods 632, the butt joint rods 632 are between the welding head 54 and the weld bevel, forming a physical blockage. The welding material cannot bypass the butt joint rods 632 to fill the bevel gap in the blocked area, and finally a breakpoint blind zone of the continuous weld is formed at the corresponding position of the butt joint rods 632, resulting in defects such as incomplete penetration and incomplete fusion, affecting the overall strength and sealing of the weld.

[0038] To address the aforementioned problem, in this embodiment, multiple docking rods 632 are axially telescopically connected to corresponding fixed rings 61. An actuator is provided at one end of the movable frame 53 near the docking rods 632. During the circumferential rotation of the movable frame 53, the actuator is used to sequentially drive each docking rod 632 to move axially toward the end away from the guide sleeve 622 until the splice seam corresponding to each docking rod 632 is sequentially exposed inside the welding head 54.

[0039] Specifically, the actuator is an arc-shaped extrusion block 56, and the thickness of the extrusion block 56 gradually increases along the rotation direction of the movable frame 53. Each docking rod 632 has a guide groove 633 on its outer wall away from the center of the fixing ring 61, and the length of the guide groove 633 is greater than the maximum thickness of the extrusion block 56. The outer peripheral wall of the fixing ring 61, used for installing the docking rods 632, has multiple protruding positioning ears 631. Each docking rod 632 is slidably inserted into its corresponding positioning ear 631, and the positioning ear 631 or the fixing ring 61 is equipped with... In the initial state, the limiting member 634 that limits the axial position of the docking rod 632 has one end of the docking rod 632 away from the guide sleeve 622 exposed on the positioning ear plate 631. The length of the guide groove 633 on the part of the docking rod 632 exposed on the positioning ear plate 631 is slightly greater than the minimum thickness of the extrusion block 56. During the circumferential rotation of the movable frame 53, the radial inner side of the extrusion block 56 slides through the guide groove 633 at the end of each docking rod 632 away from the guide sleeve 622 in sequence, thereby driving each docking rod 632 to move axially in sequence.

[0040] In this structure, in order to ensure that after the docking rod 632 is installed, the guide slot 633 can face outward in a direction away from the center of the fixing ring 61, a foolproof structure is set between the mounting hole of each docking rod 632 and the positioning ear plate 631 to ensure that the docking rod 632 can only be inserted into the positioning ear plate 631 in a unique direction and angle.

[0041] Preferably, the limiting member 634 is a spring that is slidably fitted outside the docking rod 632. One end of the spring is fixedly connected to the docking rod 632, and the other end is fixedly connected to the end of the positioning ear plate 631 near the guide sleeve 622. When the docking rod 632 is in the initial position, the spring is in a free state without force.

[0042] In this embodiment, as Figure 7 As shown, each docking rod 632 is guided and limited by two axially spaced positioning ears 631, with a spring located between the two positioning ears 631. Each docking rod 632 is installed and positioned by the two positioning ears 631, which are rigidly connected to the fixing ring 61. The docking rod 632 can reciprocate within the two positioning ears 631 along its own axis. In the initial state, the spring is in a freely extended state, without external force and without deformation. The non-spherical end of the docking rod 632 extends slightly away from one of the positioning ears 631, so that the guide groove 633 on the outer circumference of the docking rod 632 is partially exposed on the corresponding positioning ear 631, providing a pre-positioning condition for the contact drive of the extrusion block 56.

[0043] like Figure 8As shown, when the movable frame 53 drives the welding head 54 to perform the full welding process, it makes a uniform circular motion along the first annular frame 51. Because the extrusion block 56 is fixed on the movable frame 53 and is staggered with the welding head 54 in the circumferential direction, that is, before the welding head 54 approaches the docking rod 632 each time, the extrusion block 56 first contacts the exposed guide groove 633 at one end of the docking rod 632. In the initial contact stage, the thinnest end of the extrusion block 56 first fits against the exposed part of the guide groove 633, only embedding itself in the guide groove 633, and does not generate effective extrusion force on the inner wall of the guide groove 633. The docking rod 632 remains stationary under the constraint of the pre-tightening spring and does not slip axially.

[0044] As the movable frame 53 continues to move, the thickness of the extrusion block 56 gradually increases. Its inclined surface forms a surface contact with the inner wall of the guide groove 633 and applies an axial driving force. When this driving force exceeds the preload threshold of the spring, the docking rod 632 slides away from the guide sleeve 622 along its own axis, gradually disengaging from the inner cavity of the guide sleeve 622. When the welding head 54 moves to the weld area that was originally blocked by the docking rod 632, the docking rod 632 has completed effective avoidance and disengaged from the blocking position, and the weld area is fully exposed, ensuring that the welding head 54 can perform welding normally. At this time, the extrusion block 56 has not yet reached the maximum thickness position, the sliding stroke of the docking rod 632 has not reached the limit, and due to the staggered layout of the extrusion block 56 and the welding head 54, the premature reset of the docking core rod can be avoided, which would cause secondary obstruction.

[0045] After the weld in this area is completed, the movable frame 53 continues to move the extrusion block 56. When the extrusion block 56 reaches the maximum contact with the inner wall of the guide groove 633, the sliding stroke of the docking rod 632 reaches its maximum value. At this time, the welding head 54 has completely passed through the station, and there is no risk of movement interference between the two. Subsequently, the extrusion block 56 gradually disengages from the guide groove 633, and the docking rod 632 loses the mechanical extrusion limit of the extrusion block 56. Under the action of the spring's reset force, it slides in the opposite direction along the axis of the docking rod 632 and re-embeds into the guide sleeve 622, completing the avoidance and reset cycle. Through the above cycle, the welding head 54 can achieve full circumference welding of the circumferential weld without any breakpoints or blind spots.

[0046] After the full welding process is completed, the welding head 54 returns to its initial position. The operator removes the clamps at the ends of the reference steel pipe 2 and the spliced ​​steel pipe 3, cleans the surface slag and debris, and the calibration piece 6 can be used in the next round of welding operations, demonstrating good reusability. In this structure, the first ring frame 51 and the second ring frame can also be configured as a split structure, so that after welding, the upper part of the ring frame can be removed first to expose a large operating space, facilitating the removal of the clamps.

[0047] In the description of this application, the references to terms such as "this embodiment," "some embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0048] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A bridge welding displacement device for long-span arch ribs, characterized in that: include The base (1) is provided with a bearing seat (4) for supporting and limiting the reference steel pipe (2); The calibration component (6) includes two fixing rings (61) for respectively fitting around the reference steel pipe (2) and the spliced ​​steel pipe (3). One of the fixing rings (61) has multiple guide sleeves (622) on its outer peripheral wall, and the other fixing ring (61) has multiple docking rods (632) on its outer peripheral wall. During the process of the spliced ​​steel pipe (3) moving and docking with the reference steel pipe (2), the multiple docking rods (632) are respectively inserted into the multiple guide sleeves (622) so that the central axis of the reference steel pipe (2) and the spliced ​​steel pipe (3) coincides. A welding unit (5), which is installed on the base (1), is used to weld the splice seam between the reference steel pipe (2) and the splice steel pipe (3).

2. The bridge welding displacement device for long-span arch ribs according to claim 1, characterized in that: The guide sleeve (622) includes a tapered guide correction section (6221) and a cylindrical docking section (6222). The small diameter section of the guide correction section (6221) is connected to one end of the docking section (6222), and the aperture of the docking section (6222) matches the diameter of the docking rod (632).

3. The bridge welding displacement device for long-span arch ribs according to claim 1, characterized in that: The welding unit (5) includes a movable frame (53) and a welding head (54) provided on the movable frame (53). The base (1) is provided with a first annular frame (51) fitted on the outside of a fixed ring (61). A drive unit (55) for driving the movable frame (53) to make circular motion around the central axis of the reference steel pipe (2) is provided between the first annular frame (51) and the movable frame (53). The welding head (54) corresponds to the splice seam.

4. The bridge welding displacement device for long-span arch ribs according to claim 3, characterized in that: The drive unit (55) includes a drive motor (551) mounted on a movable frame (53). A drive gear (552) is connected to the drive shaft of the drive motor (551). A transmission gear ring (511) is provided on the first annular frame (51). The drive gear (552) meshes with the transmission gear ring (511).

5. The bridge welding displacement device for long-span arch ribs according to claim 4, characterized in that: The base (1) is also provided with a second annular frame fitted outside another fixed ring (61). The second annular frame and the first annular frame (51) are provided with annular guide grooves (52) on their adjacent end faces. Both ends of the movable frame (53) are provided with guide rings for slidingly engaging in the two guide grooves (52) respectively.

6. The bridge welding displacement device for long-span arch ribs according to any one of claims 3 to 5, characterized in that: Multiple docking rods (632) are axially telescopically connected to corresponding fixed rings (61). The movable frame (53) is provided with an actuator at one end near the docking rods (632). During the circumferential rotation of the movable frame (53), the actuator is used to sequentially drive each docking rod (632) to move axially toward the end away from the guide sleeve (622) until the splice seam corresponding to each docking rod (632) is sequentially exposed inside the welding head (54).

7. The bridge welding displacement device for long-span arch ribs according to claim 6, characterized in that: The actuator is an arc-shaped extrusion block (56), and the thickness of the extrusion block (56) gradually increases along the rotation direction of the movable frame (53). Each of the docking rods (632) has a guide groove (633) on its outer wall away from the center of the fixed ring (61), and the length of the guide groove (633) is greater than the maximum thickness of the extrusion block (56). The outer peripheral wall of the fixed ring (61) for installing the docking rods (632) is provided with multiple positioning ear plates (631) protruding outward. Each of the docking rods (632) is slidably inserted into the corresponding positioning ear plate (631), and the positioning ear plate (631) or the fixed ring (61) is provided with a function to limit the docking rod. A limiting member (634) for the axial position of the rod (632); In the initial state, one end of the docking rod (632) away from the guide sleeve (622) is exposed on the positioning ear plate (631), and the length of the guide groove (633) on the part of the docking rod (632) exposed on the positioning ear plate (631) is slightly greater than the minimum thickness of the extrusion block (56). During the circumferential rotation of the movable frame (53), the radial inner side of the extrusion block (56) slides sequentially from the small thickness to the large thickness position across the guide groove (633) at the end of each docking rod (632) away from the guide sleeve (622), thereby sequentially driving each docking rod (632) to move axially.

8. The bridge welding displacement device for long-span arch ribs according to claim 7, characterized in that: The limiting member (634) is a spring that is slidably fitted outside the docking rod (632). One end of the spring is fixedly connected to the docking rod (632), and the other end is fixedly connected to the end of the positioning ear plate (631) near the guide sleeve (622). When the docking rod (632) is in the initial position, the spring is in a free state without force.

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