A welding device for bridge steel structures

Abstract

This invention relates to the field of welding technology, specifically to a welding device for bridge steel structures. The welding device includes a locking part and an adjusting mechanism. Two first rotating frames and two second rotating frames are rotatably connected to the locking part, arranged circumferentially. The locking part is used to lock / unlock the rotation of the first and second rotating frames. Each of the first and second rotating frames is equipped with a magnetic component and a switch. Each first rotating frame has a positioning plate. Each second rotating frame has a support base. Each support base is rotatably connected to two first clamping bars, which extend parallel to the length of the pipe and have a semi-circular cross-section with a clamping surface. The welding device for bridge steel structures has a first state and a second state depending on the cross-sectional shape of the pipe to be positioned. The adjusting mechanism is used to switch the state of the welding device, thereby improving its versatility.

Description

Technical Field

[0001] This invention relates to the field of welding technology, and in particular to a welding apparatus for bridge steel structures. Background Technology

[0002] As one of the core structural forms in modern bridge engineering, bridge steel structures are specifically defined as systems constructed using steel for the parts of the bridge superstructure that bear the main load transfer and mechanical support functions. Compared to traditional concrete structures, steel structures are widely used in engineering scenarios such as long-span bridges and irregularly shaped bridges due to their high strength, light weight, short construction period, and excellent seismic performance.

[0003] In the construction of bridge steel structures, tubular materials are a fundamental and commonly used component. Due to their advantages such as uniform stress distribution and good wind resistance, they are often used in the supporting framework and connection nodes of bridges. The assembly of these components often requires welding two tubular materials at a specific angle to meet the overall structural mechanical design requirements. This angle welding operation often relies on welding fixtures to provide stable positioning support and angular constraints, and their performance directly affects the quality of the weld.

[0004] In related technologies, such as Chinese patent CN210649262U, an adjustable angle welding fixture with a switch is disclosed. It includes a first positioning part and a second positioning part that can be magnetized. One end of the two parts is rotatably connected by a rotating shaft to realize the opening and closing adjustment of the angle. The first positioning part is provided with a first magnetic component and a first switch for controlling the magnetic switch of the first magnetic component. The second positioning part is provided with a second magnetic component and a second switch for controlling the magnetic switch of the second magnetic component. It also includes a locking mechanism that can lock and fix the first positioning part, the second positioning part and the rotating shaft, thereby realizing the welding fixation of two pipes at any angle.

[0005] However, the aforementioned adjustable angle welding fixture with switch can only be used to weld and fix parallel pipes, and cannot be used to weld and fix round pipes, resulting in poor versatility. Summary of the Invention

[0006] Therefore, it is necessary to provide a welding device for bridge steel structures to address the problem of poor versatility of current welding fasteners.

[0007] The above objectives are achieved through the following technical solutions:

[0008] A welding device for bridge steel structures includes a locking part and an adjusting mechanism. Two first rotating frames and two second rotating frames are rotatably connected to the locking part, arranged circumferentially. The locking part is used to lock / unlock the rotation of the first and second rotating frames. Each of the first and second rotating frames is equipped with a magnetic component and a switching element. The magnetic component generates a magnetic force to attract the pipe material. The switching element controls the magnetic switching of the magnetic component. Each first rotating frame is equipped with a positioning plate. Each second rotating frame is equipped with a support base. Each support base is rotatably connected to two first clamping strips, which extend parallel to the length of the pipe material, have a semi-circular cross-section, and have a clamping surface on their front side.

[0009] When the welding device for the bridge steel structure positions the square tubes, it is in a first state, with the surfaces of the two positioning plates intersecting or overlapping, and the two square tubes can be fixed respectively under the action of the magnetic component; when the welding device for the bridge steel structure positions the round tubes, it is in a second state, with the positioning plate and the support seat facing each other, and a space for clamping the round tubes is formed between the positioning plate and the two first clamping strips, the clamping surfaces of the two first clamping strips forming a figure-eight structure, with the larger opening facing the positioning plate; the adjustment mechanism is used to switch the state of the welding device for the bridge steel structure.

[0010] Furthermore, the adjustment mechanism includes a pin and a locking assembly; one of the first rotating frames is a split structure, having a first rotating part and a first mounting part rotatably connected, the first rotating frame being rotatably connected to the locking part via the first rotating part, and the first rotating part and the first mounting part being fixedly connected via the pin; one of the second rotating frames is a split structure, having a second rotating part and a second mounting part rotatably connected, the second rotating frame being rotatably connected to the locking part via the second rotating part, and the second rotating part and the second mounting part being fixedly connected via the pin; the locking assembly is used to lock the first rotating frame and the second rotating frame, enabling the first rotating frame and the second rotating frame to rotate synchronously.

[0011] Furthermore, the locking part includes two first clamping cylinders, which are arranged axially at intervals; each first clamping cylinder is threadedly inserted with a second clamping cylinder, and the first clamping cylinder and the second clamping cylinder are respectively clamped on both sides of the two first rotating frames and the two second rotating frames.

[0012] Furthermore, each of the first clamping cylinders has a plurality of protrusions on its outer peripheral wall, and the plurality of protrusions are arranged at intervals along the circumferential direction.

[0013] Furthermore, the locking assembly includes a slide cylinder and eight locking protrusions. Each of the second clamping cylinders is fitted with the slide cylinder, which can slide along its own axis and rotate around its own axis, and can form a stop engagement with the first clamping cylinder. Each slide cylinder has a handle on its outer peripheral wall, which is located outside the second clamping cylinder and extends radially along the slide cylinder. Each of the first rotating frame and each of the second rotating frames has two locking protrusions. The handle can be simultaneously sleeved on the two locking protrusions located on the first rotating frame and the second rotating frame, respectively.

[0014] Furthermore, the handle can form a magnetic connection with the locking protrusion.

[0015] Furthermore, the positioning plate is capable of elastically sliding along a direction perpendicular to its own surface, and is connected to the first rotating frame via a first locking member, the first locking member being configured to lock / unlock the sliding of the positioning plate.

[0016] Furthermore, the support base is capable of elastically sliding along a direction perpendicular to the extension of the first clamping bar, and is connected to the second rotating frame via a second locking member, the second locking member being configured to lock / unlock the sliding of the support base.

[0017] Furthermore, each of the first clamping bars is rotatably connected to two second clamping bars. The second clamping bars are embedded in the straight surface of the first clamping bar and are arranged parallel to the first clamping bar. The cross-sectional shape of the second clamping bar is semi-circular, and the straight surface of the second clamping bar is the clamping surface.

[0018] Furthermore, one of the first rotating frames is provided with an angle scale; the other first rotating frame is provided with a pointer, which is used to indicate the angle scale.

[0019] The beneficial effects of this invention are:

[0020] This invention relates to a welding device for bridge steel structures. By comprising a positioning plate, an adjustment mechanism, a support base, and two first clamping bars rotatably connected to the support base, the welding device is in a first state when positioning square tubes is required. The surfaces of the two positioning plates intersect or overlap, and under the action of a magnetic component, two square tubes can be fixed respectively, thus enabling welding and fixing of two square tubes at any angle. When positioning round tubes is required, the welding device switches from the first state to a second state under the action of the adjustment mechanism. The positioning plate and support base are positioned opposite each other, and a space for clamping the round tube is formed between the positioning plate and the two first clamping bars. The clamping surfaces of the two first clamping bars form a V-shape structure, with the larger opening facing the positioning plate, thus enabling welding and fixing of two round tubes at any angle, improving versatility. Attached Figure Description

[0021] Figure 1 A three-dimensional structural schematic diagram of the welding device for a bridge steel structure provided in an embodiment of the present invention when it is in the first state;

[0022] Figure 2 This is an exploded view of the welding device for bridge steel structures provided in an embodiment of the present invention;

[0023] Figure 3 An exploded view of some structural components of the welding device for bridge steel structures provided in this embodiment of the invention. Figure 1 ;

[0024] Figure 4 An exploded view of some structural components of the welding device for bridge steel structures provided in this embodiment of the invention. Figure 2 ;

[0025] Figure 5 An exploded view of some structural components of the welding device for bridge steel structures provided in this embodiment of the invention. Figure 3 ;

[0026] Figure 6 An exploded view of some structural components of the welding device for bridge steel structures provided in this embodiment of the invention. Figure 4 ;

[0027] Figure 7 A front view schematic diagram of the welding device for a bridge steel structure provided in an embodiment of the present invention when it is in the second state;

[0028] Figure 8 for Figure 7 Sectional view along the AA direction;

[0029] Figure 9 for Figure 7 Sectional view along the BB direction;

[0030] Figure 10 A three-dimensional structural diagram of the welding device for a bridge steel structure when switching states, provided in an embodiment of the present invention;

[0031] Figure 11 A three-dimensional structural diagram of the welding device for bridge steel structures provided in this embodiment of the invention when welding circular tubes. Figure 1 ;

[0032] Figure 12 A three-dimensional structural diagram of the welding device for bridge steel structures provided in this embodiment of the invention when welding circular tubes. Figure 2 ;

[0033] Figure 13This is a three-dimensional structural diagram of the welding device for bridge steel structures provided in an embodiment of the present invention when welding square tubes.

[0034] in:

[0035] 1. Locking part; 101. First clamping sleeve; 1011. First clamping ring; 1012. Protrusion; 102. Second clamping sleeve; 1021. Second clamping ring;

[0036] 201. Pin; 2021. Slide cylinder; 20211. Retaining ring; 2022. Handle; 20221. Third slot; 2023. Locking protrusion;

[0037] 3. First rotating frame; 301. First side plate; 3011. First slide groove; 302. Second side plate; 3021. First through hole; 303. First connecting plate; 3031. First slot; 304. First rotating component;

[0038] 4. Second rotating frame; 401. Third side plate; 4011. Second slide groove; 402. Fourth side plate; 4021. Second through hole; 403. Second connecting plate; 4031. Second slot; 404. Second rotating component;

[0039] 5. Magnetic components;

[0040] 6. Switching components;

[0041] 7. Positioning plate;

[0042] 8. Support base; 801. Arc-shaped surface;

[0043] 9. First interlocking strip;

[0044] 10. First compression spring;

[0045] 11. First locking element;

[0046] 12. Second compression spring;

[0047] 13. Second locking element;

[0048] 14. Second interlocking strip. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0050] The component designations used in this document, such as "first" and "second," are merely for distinguishing the described objects and do not have any sequential or technical meaning. The terms "connection" and "linkage," unless otherwise specified, include both direct and indirect connections (linkages). In the description of this invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0051] In this invention, unless otherwise explicitly 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," "over," and "on top" of 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.

[0052] The positioning part of existing welding fixtures is designed based on the cross-sectional shape of square tubes. Its positioning surface is typically a planar structure, forming stable support and magnetic attraction through the contact between the planar surface and the side of the square tube. However, round tubes have a circular cross-section and an arc-shaped surface. When placed on a planar positioning surface, only line or point contact can be formed, failing to achieve full contact between the positioning surface and the round tube surface. This results in the ineffective transmission of the magnetic attraction force of component 5, making it difficult to stably fix the round tube and potentially causing problems such as tube rolling and displacement during welding, thus affecting welding quality. Therefore, existing welding fixtures are only suitable for angle welding of square tubes and cannot meet the welding needs of round tubes, which are also commonly used in bridge steel structures, thus limiting their applicability and making them unsuitable for diverse tube welding scenarios.

[0053] Based on this, the present invention provides a welding device for bridge steel structures, which can fix the welding angle of both square and round pipes, and has good versatility.

[0054] Specifically, refer to Figures 1 to 13As shown, in the bridge steel structure welding device provided in the embodiment of the present invention, it is configured to include a locking part 1 and an adjustment mechanism. The locking part 1 includes two first clamping cylinders 101, which are arranged axially at intervals and have open ends facing each other. A second clamping cylinder 102 is threaded into each first clamping cylinder 101, and the second clamping cylinder 102 is inserted into the first clamping cylinder 101 through the open end of the first clamping cylinder 101.

[0055] The locking part 1 is rotatably connected to two first rotating frames 3 and two second rotating frames 4, which are arranged circumferentially. The first rotating frame 3 is I-shaped and has two oppositely arranged first side plates 301, two oppositely arranged second side plates 302, and a first connecting plate 303 that is perpendicularly connected between the two first side plates 301 and the two side plates 302. The surfaces of the first side plates 301 and the second side plates 302 on the same side overlap. Each second side plate 302 has a first through hole 3021 on its surface. The two first through holes 3021 are arranged correspondingly. When the first rotating frame 3 is installed, it is rotatably sleeved on the two first clamping cylinders 101 through the two first through holes 3021 respectively.

[0056] The second rotating frame 4 is I-shaped and has two opposing third side plates 401, two opposing fourth side plates 402, and a second connecting plate 403 that is perpendicularly connected between the two third side plates 401 and the four side plates 402. The surfaces of the third side plates 401 and the fourth side plates 402 on the same side overlap. Each fourth side plate 402 has a second through hole 4021 on its surface. The two second through holes 4021 are arranged correspondingly. When the second rotating frame 4 is installed, it is rotatably sleeved on the two first clamping cylinders 101 through the two second through holes 4021 respectively. A first clamping ring 1011 is coaxially sleeved on the ends of the two first clamping cylinders 101 that are far apart from each other. A second clamping ring 1021 is coaxially sleeved on the ends of the two second clamping cylinders 102 that are close to each other. A space for clamping the two second side plates 302 and the two fourth side plates 402 is formed between the second clamping ring 1021 and the first clamping ring 1011.

[0057] To avoid interference, the spacing between the two second side plates 302 of the two first rotating frames 3 and the two fourth side plates 402 of the two second rotating frames 4 are not equal. Exemplarily, for the same locking part 1, from the outside to the inside, its first clamping sleeve 101 can be sequentially fitted with a second side plate 302 on one side, a fourth side plate 402 on one side, a fourth side plate 402 on the other side, and a second side plate 302 on the other side.

[0058] The locking part 1 is used to lock / unlock the rotation of the first rotating frame 3 and the second rotating frame 4: When it is necessary to lock the rotation of the first rotating frame 3 and the second rotating frame 4, tighten the first clamp 101 and the second clamp 102 to reduce the gap between the first clamping ring 1011 and the second clamping ring 1021, thereby clamping the two second side plates 302 and the two fourth side plates 402 between the first clamping ring 1011 and the second clamping ring 1021, so that the rotation of the first rotating frame 3 and the second rotating frame 4 is locked by friction; When it is necessary to unlock the rotation of the first rotating frame 3 and the second rotating frame 4, loosen the first clamp 101 and the second clamp 102 to increase the gap between the first clamping ring 1011 and the second clamping ring 1021, thereby loosening the two second side plates 302 and the two fourth side plates 402 between the first clamping ring 1011 and the second clamping ring 1021, so that the rotation of the first rotating frame 3 and the second rotating frame 4 is unlocked.

[0059] Both the first rotating frame 3 and the second rotating frame 4 are equipped with a magnetic component 5 and a switch component 6. The magnetic component 5 is used to generate a magnetic force to attract the tubing and is located between the two first side plates 301 or the two third side plates 401. The switch component 6 is used to control the magnetic force switch of the magnetic component 5 and can be configured as a knob. The magnetic component 5 and the switch component 6 can adopt the same structure as the magnetic component 5 and switch in patent document CN210649262U, or the same structure as the magnetic component 5 composed of rotating magnetic blocks and fixed magnetic blocks and the knob in patent document CN218800093U. This is prior art and will not be described in detail. Each first rotating frame 3 is equipped with a positioning plate 7, which is located between the two first side plates 301 and is perpendicular to the first side plates 301. Each second rotating frame 4 is provided with a support base 8, which is located between two third side plates 401. The support base 8 has a U-shaped strip structure, with its opening facing away from the magnetic component 5 and arranged parallel to the magnetic component 5. Each support base 8 has a mirror-image arc-shaped surface 801 on its two opposite inner side walls. The arc-shaped surface 801 has a strip-shaped concave structure and is arranged parallel to the support base 8. Each arc-shaped surface 801 is provided with a first clamping bar 9. The peripheral side wall of the first clamping bar 9 coincides with the arc-shaped surface 801 and is connected by an arc-shaped slide bar and a slide groove. The cross-sectional shape of the slide bar and the slide groove are both T-shaped, forming a rotational connection. The straight side wall of the first clamping bar 9 is the clamping surface.

[0060] When the welding device for the bridge steel structure positions the square tubes, it is in the first state. The surfaces of the two positioning plates 7 intersect or overlap, and under the action of the magnetic component 5, they can fix the two square tubes respectively, thus enabling welding fixation of the two square tubes at any angle. When the welding device for the bridge steel structure positions the round tubes, it is in the second state. The positioning plate 7 and the support base 8 are arranged opposite each other, and a space for clamping the round tubes is formed between the positioning plate 7 and the two first clamping bars 9. The clamping surfaces of the two first clamping bars 9 form a figure-eight structure, with the larger opening facing the positioning plate 7, thus enabling welding fixation of the two round tubes at any angle, which is beneficial to improving versatility. The adjustment mechanism is used to switch the state of the welding device for the bridge steel structure.

[0061] More specifically, the adjustment mechanism is configured to include a pin 201 and a locking assembly. One of the first rotating frames 3 is a split structure, having a first rotating part and a first mounting part rotatably connected. The first rotating part consists of two second side plates 302 and a portion of a first connecting plate 303. The first mounting part consists of two first side plates 301 and another portion of a first connecting plate 303. A first slot 3031 is provided on the surface of the first connecting plate 303 of the first rotating part facing the first mounting part. A first rotating member 304 is provided on the surface of the first connecting plate 303 of the first mounting part facing the first rotating part. The first rotating member 304 can be inserted into the first slot 3031 and fits perfectly. The second rotating frame 4 is a split structure, with a second rotating part and a second mounting part that are rotatably connected. The second rotating part consists of two fourth side plates 402 and a portion of a second connecting plate 403. The second mounting part consists of two third side plates 401 and another portion of a second connecting plate 403. A second slot 4031 is provided on the surface of the second connecting plate 403 of the second rotating part facing the second mounting part. A second rotating component 404 is provided on the surface of the second connecting plate 403 of the second mounting part facing the second rotating part. The second rotating component 404 can be inserted into the second slot 4031 and fits in shape. The second rotating component 404 and the first rotating component 304 can be spliced ​​together to form a complete multi-level concentric columnar structure.

[0062] There are two pins 201. One of them is inserted into the first connecting plate 303 and the first rotating member 304 at the same time to lock the rotation of the first rotating part and the first mounting part. The other is inserted into the second connecting plate 403 and the second rotating member 404 at the same time to lock the rotation of the second rotating part and the second mounting part. When both pins 201 are pulled out, the first mounting part can rotate relative to the first rotating part, and the second mounting part can rotate relative to the second rotating part.

[0063] The locking assembly is used to lock the first rotating frame 3 and the second rotating frame 4, so that the first rotating frame 3 and the second rotating frame 4 can rotate synchronously.

[0064] More specifically, the locking assembly includes a slide cylinder 2021 and eight locking protrusions 2023. Each second clamping cylinder 102 contains a slide cylinder 2021. A retaining ring 20211 is coaxially sleeved at the end of the slide cylinder 2021 closest to the second clamping cylinder 102. The slide cylinder 2021 can slide along its own axis and rotate around its own axis, and can form a stop engagement with the first clamping cylinder 101 through the retaining ring 20211 to prevent it from dislodging from the first clamping cylinder 101. A handle 202 is provided on the outer peripheral wall of each slide cylinder 2021 at the end away from the retaining ring 20211. 2. The handle 2022 is located outside the second clamping cylinder 102 and extends radially along the slide cylinder 2021. A third slot 20221 is provided on the side wall of the handle 2022 facing the retaining ring 20211. The third slot 20221 is located at the end of the handle 2022 away from the retaining ring 20211. Each first rotating frame 3 and each second rotating frame 4 are provided with two locking protrusions 2023. The handle 2022 can be simultaneously sleeved on the two locking protrusions 2023 located on the first rotating frame 3 and the second rotating frame 4 respectively through the third slot 20221.

[0065] Initially, such as Figure 1 As shown, in a clockwise direction, the first rotating frame 3, the second rotating frame 4, and the second rotating frame 5 are arranged in sequence, with the left first rotating frame 3 and the left second rotating frame 4 in close contact, and the right first rotating frame 3 and the right second rotating frame 4 in close contact; both positioning plates 7 are on top, and both support seats 8 are on the bottom; the first clamping sleeve 101 and the second clamping sleeve 102 are tightened to fix the included angle between the two first rotating frames 3; the handle 2022 on the front side points to the left, and simultaneously engages with the locking protrusion on the left first side plate 301 through the third slot 20221. 2023. The locking protrusion 2023 on the third side plate 401 on the left side engages with the first rotating frame 3 and the second rotating frame 4 on the left side, so that they can rotate synchronously. The handle 2022 on the rear side points to the right and engages with the locking protrusion 2023 on the first side plate 301 on the right side and the locking protrusion 2023 on the third side plate 401 on the right side through the third slot 20221, so that the first rotating frame 3 and the second rotating frame 4 on the right side can rotate synchronously, so as to avoid the adjustment of the included angle between the two positioning plates 7 due to the random rotation of the second rotating frame 4.

[0066] When positioning the square tubes, first loosen the first clamp 101 and the second clamp 102 to adjust the angle between the two first rotating frames 3 (0°-180°), which in turn adjusts the angle between the two positioning plates 7. Then, based on the required welding angle between the two square tubes, keep one of the first rotating frames 3 stationary while rotating the other until the angle between the two positioning plates 7 equals the required welding angle between the two square tubes. Then tighten the first clamp 101 and the second clamp 102 to lock the two first rotating frames 3, which in turn locks the two positioning plates 7. Then, place the two square tubes overlapping on the two positioning plates 7, ensuring they are coplanar. Then, activate the magnetic switch of the corresponding magnetic component 5 using the switch 6 on the two first rotating frames 3. Under magnetic action, the two square tubes are attracted to the two positioning plates 7, thus fixing them. Then, the two square tubes can be welded.

[0067] When positioning the round tube, firstly, the sliding cylinder 2021 is pulled out of the second clamp 102, causing the locking protrusions 2023 on the locking first and second mounting parts to disengage from the third slot 20221; then, the pin 201 is pulled out, allowing the first and second mounting parts to rotate relative to the first and second rotating parts; then, the first and second mounting parts are rotated 180 degrees, so that in a clockwise direction, the first rotating frame 3, the second rotating frame 4, the first rotating frame 3, and the second rotating frame 4 are arranged sequentially; then, the pin 201 is reinserted, locking the first and second mounting parts. Rotate; then loosen the first clamp 101 and the second clamp 102 so that the included angle between the first rotating frame 3 and the second rotating frame 4 can be adjusted; then rotate the second rotating frame 4 on the right until it is in close contact with the first rotating frame 3 on the left, at which point the positioning plate 7 is below and the support base 8 is above, and they are arranged opposite to each other, and a space for clamping the round tube is formed between the positioning plate 7 and the two first clamping strips 9; then rotate the second rotating frame 4 on the left until it is in close contact with the first rotating frame 3 on the right, at which point the positioning plate 7 is above and the support base 8 is below, and they are arranged opposite to each other, and a space for clamping the round tube is formed between the positioning plate 7 and the two first clamping strips 9.

[0068] First, rotate handle 2022 so that the third slot 20221 aligns with the two locking protrusions 2023 on the first rotating frame 3 and the second rotating frame 4 on the same side. Then, drive the slide cylinder 2021 back into the second clamping cylinder 102, so that the locking protrusions 2023 are inserted into the third slot 20221. This allows the first rotating frame 3 and the second rotating frame 4 on the same side to rotate synchronously, facilitating the adjustment of the included angle between the two spaces used to clamp the round tubes. Then, according to the required welding angle between the two round tubes, keep one of the first rotating frames 3 stationary while driving the other first rotating frame 3 to rotate until both are rotated. The included angle between the spaces used to clamp the round tubes is equal to the required welding angle between the two round tubes. Then, the two round tubes are respectively inserted into the two spaces used to clamp the round tubes, ensuring that they are coplanar. As the round tubes are inserted, the first clamping bar 9 rotates, and the two first clamping bars 9 form a figure-eight structure with the larger opening facing the positioning plate 7. The round tubes are clamped by the positioning plate 7 and the straight surfaces of the two first clamping bars 9. Then, the magnetic switch of the corresponding magnetic component 5 is turned on by the switch 6. Under the action of magnetism, the two round tubes are attracted and fixed. Then, the two round tubes can be welded.

[0069] In a further embodiment, to improve the ease of rotating the first clamping cylinder 101, a plurality of protrusions 1012 are provided on the outer peripheral wall of each first clamping cylinder 101, i.e., the first clamping ring 1011, and the plurality of protrusions 1012 are arranged at intervals along the circumference. In this way, it is convenient for the operator to move the first clamping cylinder 101 by means of the protrusions 1012, thereby making it easy to loosen or tighten the first clamping cylinder 101 and the second clamping cylinder 102.

[0070] In some embodiments, to improve the stability of the locking component when locked, the handle 2022 is configured to form a magnetic connection with the locking protrusion 2023.

[0071] In other embodiments, to improve applicability and achieve welding and fixing of round tubes of various sizes, the positioning plate 7 can be configured to elastically slide along a direction perpendicular to its own surface. Specifically, multiple first compression springs 10 are connected between the positioning plate 7 and the magnetic component 5. Under the action of the first compression springs 10, the positioning plate 7 tends to move away from the magnetic component 5. The positioning plate 7 is connected to the first rotating frame 3 through a first locking member 11. The first locking member 11 is configured to lock / unlock the sliding of the positioning plate 7. After the positioning plate 7 moves to a suitable position, locking the position of the positioning plate 7 ensures the clamping of the round tube. Stability; specifically, the first locking member 11 is configured as a knob structure and has a first insert rod coaxially arranged. A first connecting rod is vertically arranged on the plate surface of the positioning plate 7 facing the magnetic component 5. The first insert rod rotates and passes through the first connecting rod. A first sliding groove 3011 is opened on the first side plate 301. The first sliding groove 3011 extends in a direction parallel to the plate surface of the positioning plate 7. The first insert rod is slidably inserted into the first sliding groove 3011. A first nut is threaded onto the first insert rod. The first nut is located inside the first connecting rod and can form a stop cooperation with the first connecting rod to facilitate locking the positioning plate 7.

[0072] During use, when the included angle between the two spaces used to clamp the round tubes is equal to the required welding angle between the two round tubes, loosen the first nut to adjust the position of the positioning plate 7; then slide the positioning plate 7 to the appropriate position; then tighten the first nut to lock the position of the positioning plate 7; then insert the two round tubes into the two spaces used to clamp the round tubes respectively, ensuring that they are coplanar. As the round tubes are inserted, the first clamping bar 9 rotates, and the two first clamping bars 9 form a figure-eight structure with the larger opening facing the positioning plate 7, and clamp the round tubes through the positioning plate 7 and the straight surfaces of the two first clamping bars 9; then turn on the magnetic switch of the corresponding magnetic component 5 through the switch 6, and the two round tubes are attracted by the magnetism to achieve fixation; then the two round tubes can be welded.

[0073] In other embodiments, to improve applicability and achieve welding and fixing of round tubes of various sizes, the support base 8 can be configured to elastically slide along a direction perpendicular to the extension of the first clamping bar 9. Specifically, multiple second compression springs 12 are connected between the support base 8 and the magnetic component 5. Under the action of the second compression springs 12, the support base 8 tends to move away from the magnetic component 5. The support base 8 is connected to the second locking member 13 and the second rotating frame 4. The second locking member 13 is configured to lock / unlock the sliding of the support base 8. After the support base 8 moves to a suitable position, locking the position of the support base 8 ensures the clamping of the round tube. The stability of the support is ensured. Specifically, the second locking member 13 is configured as a knob structure and has a second insert rod arranged coaxially. A second connecting rod is vertically arranged on the plate surface of the support base 8 facing the magnetic component 5. The second insert rod rotates and passes through the second connecting rod. A second sliding groove 4011 is provided on the third side plate 401. The second sliding groove 4011 extends in a direction perpendicular to the first clamping bar 9. The second insert rod is slidably inserted into the second sliding groove 4011. A second nut is threaded onto the second insert rod. The second nut is located inside the second connecting rod and can form a stop engagement with the second connecting rod to facilitate locking the support base 8.

[0074] During use, when the included angle between the two spaces used to clamp the round tubes is equal to the required welding angle between the two round tubes, loosen the second nut to adjust the position of the support seat 8; then slide the support seat 8 to the appropriate position; then tighten the second nut to lock the position of the support seat 8; then insert the two round tubes into the two spaces used to clamp the round tubes respectively, ensuring that they are coplanar. As the round tubes are inserted, the first clamping bar 9 rotates, and the two first clamping bars 9 form a figure-eight structure with the larger opening facing the positioning plate 7, and clamp the round tubes through the positioning plate 7 and the straight surfaces of the two first clamping bars 9; then turn on the magnetic switch of the corresponding magnetic component 5 through the switch 6, and the two round tubes are attracted by the magnetism to achieve fixation; then the two round tubes can be welded.

[0075] In other embodiments, the positioning plate 7 is configured to slide elastically along a direction perpendicular to its own surface and is connected to the first rotating frame 3 via a first locking member 11. The first locking member 11 is configured to lock / unlock the sliding of the positioning plate 7. The support base 8 is configured to slide elastically along a direction perpendicular to the extension of the first clamping strip 9 and is connected to the second rotating frame 4 via a second locking member 13. The second locking member 13 is configured to lock / unlock the sliding of the support base 8.

[0076] During use, the welding angle of more round tubes can be fixed by sliding adjustment of the positioning plate 7 and the support base 8.

[0077] In other embodiments, since the outer peripheral wall of the round tube may have protrusions or depressions, in order to ensure the stability of clamping the round tube, two second clamping bars 14 are rotatably connected to each first clamping bar 9. The two second clamping bars 14 are arranged at intervals. The second clamping bars 14 are embedded in the straight surface of the first clamping bar 9 and are arranged parallel to the first clamping bar 9. The cross-sectional shape of the second clamping bar 14 is semi-circular, and the straight surface of the second clamping bar 14 is the clamping surface.

[0078] Thus, by setting the second clamping bar 14, a clamping structure similar to a tiger clamp is formed, thereby achieving clamping adaptation for protrusions or depressions on the outer peripheral wall of the round pipe, thereby improving the stability when clamping the round pipe.

[0079] In other embodiments, to improve the convenience of adjusting the welding angle, one of the first rotating frames 3 is provided with an angle scale; the other first rotating frame 3 is provided with a pointer, which is used to indicate the angle scale.

[0080] In other embodiments, to ensure the stability of the magnetic component 5 when it magnetically attracts the pipe, the positioning plate 7, the support base 8, the first clamping bar 9, and the second clamping bar 14 are all made of magnetically permeable material.

[0081] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0082] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A welding device for bridge steel structures, characterized in that, The welding device for the bridge steel structure includes a locking part and an adjusting mechanism. Two first rotating frames and two second rotating frames are rotatably connected to the locking part, arranged circumferentially. The locking part is used to lock / unlock the rotation of the first and second rotating frames. Each of the first and second rotating frames is equipped with a magnetic component and a switch. The magnetic component generates a magnetic force to attract the pipe. The switch controls the magnetic switching of the magnetic component. Each first rotating frame is equipped with a positioning plate. Each second rotating frame is equipped with a support base. Each support base is rotatably connected to two first clamping strips, which extend parallel to the length of the pipe and have a semi-circular cross-section with a clamping surface on their front side. When the welding device for the bridge steel structure positions the square tubes, it is in a first state, with the surfaces of the two positioning plates intersecting or overlapping, and the two square tubes can be fixed respectively under the action of the magnetic component; when the welding device for the bridge steel structure positions the round tubes, it is in a second state, with the positioning plate and the support seat facing each other, and a space for clamping the round tubes is formed between the positioning plate and the two first clamping strips, the clamping surfaces of the two first clamping strips forming a figure-eight structure, with the larger opening facing the positioning plate; the adjustment mechanism is used to switch the state of the welding device for the bridge steel structure. The adjustment mechanism includes a latch and a locking assembly; in The first rotating frame is a split structure and has a first rotating part and a first mounting part that are rotatably connected. The first rotating frame is rotatably connected through the first rotating part and the locking part, and the first rotating part and the first mounting part are fixedly connected through the pin. One of the second rotating frames is a split structure, and has a second rotating part and a second mounting part that are rotatably connected. The second rotating frame is rotatably connected to the locking part through the second rotating part, and the second rotating part and the second mounting part are fixedly connected by the pin. The locking component is used to lock the first rotating frame and the second rotating frame so that the first rotating frame and the second rotating frame can rotate synchronously. The locking part includes two first clamping cylinders, which are arranged axially at intervals; each first clamping cylinder is threadedly inserted with a second clamping cylinder, and the first clamping cylinder and the second clamping cylinder are respectively clamped on both sides of the two first rotating frames and the two second rotating frames. Each of the first clamping cylinders has a plurality of protrusions on its outer peripheral wall, and the plurality of protrusions are arranged at intervals along the circumferential direction. The locking assembly includes a slide cylinder and eight locking protrusions. Each of the second clamping cylinders is fitted with a slide cylinder, which can slide along its own axis and rotate around its own axis, and can form a stop engagement with the first clamping cylinder. Each slide cylinder has a handle on its outer peripheral wall, which is located outside the second clamping cylinder and extends radially along the slide cylinder. Each of the first rotating frame and each of the second rotating frames has two locking protrusions. The handle can be simultaneously sleeved on the two locking protrusions located on the first rotating frame and the second rotating frame, respectively.

2. The welding device for bridge steel structures according to claim 1, characterized in that, The handle can be magnetically connected to the locking protrusion.

3. The welding device for bridge steel structures according to claim 1, characterized in that, The positioning plate can slide elastically along a direction perpendicular to its own surface, and is connected to the first rotating frame through a first locking member. The first locking member is configured to lock / unlock the sliding of the positioning plate.

4. The welding device for bridge steel structures according to claim 1, characterized in that, The support base is capable of elastically sliding along a direction perpendicular to the extension of the first clamping bar, and is connected to the second rotating frame via a second locking member, the second locking member being configured to lock / unlock the sliding of the support base.

5. The welding device for bridge steel structures according to claim 1, characterized in that, Each of the first clamping bars is rotatably connected to two second clamping bars. The second clamping bars are embedded in the straight surface of the first clamping bar and are arranged parallel to the first clamping bar. The cross-sectional shape of the second clamping bar is semi-circular, and the straight surface of the second clamping bar is the clamping surface.

6. The welding device for bridge steel structures according to claim 1, characterized in that, One of the first rotating frames is provided with an angle scale; the other first rotating frame is provided with a pointer, which is used to indicate the angle scale.

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