A welding positioning device for steel structure arch bridge

Abstract

The present invention relates to the technical field of welding positioning devices, and specifically to a welding positioning device for a steel structure arch bridge, which includes an adjustment mechanism and two positioners; the peripheral wall surface of the positioner includes a plurality of positioning surfaces connected end to end for fixing a workpiece; the adjustment mechanism is arranged between the two positioners, and is used to adjust the distance between the two positioners and the angle between the two positioners. The present invention can adjust the distance between the two positioners and the angle between the two first side plates through the adjustment mechanism, thereby changing the angle between the positioning surfaces of the two positioners; the flexibility is improved, and it can adapt to the changing welding angle requirements in welding tasks; further, after the welding is completed, the first connecting rod is rotated relative to the second connecting rod, driving the two positioners to rotate relative to each other, and as the rotation angle of the positioner increases, the contact area between the positioner and the workpiece decreases, thereby reducing the magnetic force between the workpiece and the positioner, so as to facilitate the separation of the positioner from the workpiece.

Description

Technical Field

[0001] The invention relates to the technical field of welding positioning devices, and in particular to a welding positioning device for a steel structure arch bridge. Background Art

[0002] In the process of welding steel arch bridges, at least two profiles to be welded need to be accurately combined according to the preset angle and initially fixed in position by spot welding. In this process, the traditional method relies on manual operation: one person is responsible for stabilizing the profiles to ensure that the angle and position between them are accurate; the other person operates the welding equipment to perform the welding operation. However, this model is not only inefficient, but also difficult to ensure the accuracy of welding.

[0003] To this end, the industry has innovatively developed welding positioners to optimize the preparation work before welding. For example, Chinese patent CN212634806U discloses a magnetic welding positioner, which includes at least one fixed plate made of magnetic material, which absorbs and stabilizes the profile without additional support, thereby achieving stable maintenance of the profile at a preset angle and position. This design significantly improves the efficiency and accuracy of welding operations, lays a solid foundation for the subsequent installation process, and effectively reduces installation errors.

[0004] However, the products currently on the market still face certain limitations. Specifically, they often lack flexibility and are difficult to adapt to the changing welding angle requirements in welding tasks, limiting their scope of application. In addition, due to the large magnetic force of the fixing plate, it is often difficult to separate the positioner from the profile after welding, which brings inconvenience to subsequent work. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention proposes a welding positioning device for a steel structure arch bridge, which can adapt to the changing welding angle requirements in welding tasks, broaden the application scope of traditional welding positioners, and can more conveniently separate the positioner from the workpiece.

[0006] The welding positioning device for a steel structure arch bridge of the present invention adopts the following technical solution: it includes an adjustment mechanism, two positioners and two fixing components;

[0007] The peripheral wall surface of the positioner includes a plurality of positioning surfaces connected end to end for fixing the workpiece, which are respectively set as a first positioning surface, a second positioning surface, a third positioning surface and a fourth positioning surface; the positioner includes two side plates of the same size and shape and a magnet fixedly connected between the two side plates;

[0008] The adjusting mechanism is arranged between the two positioners for adjusting the distance between the two positioners and the angle between the two positioners; the adjusting mechanism comprises a first connecting rod, a second connecting rod, a first hinge axis and a second hinge axis; the first connecting rod and the second connecting rod are respectively connected to the two positioners; the first connecting rod and the second connecting rod are coaxially arranged, and the end of the first connecting rod close to the second connecting rod is inserted into the second connecting rod, and can move along its own axis and rotate around the axis; in the projection of the surface where the side plate is located, the projection of the axis of the first connecting rod and the second connecting rod is perpendicular to the projection of the first positioning surface; in the initial state, the two first positioning surfaces are in contact; the first hinge axis is fixedly connected to the first connecting rod, and the axial direction of the first hinge axis is perpendicular to the first connecting rod; the positioner connected to the first connecting rod is rotatably connected to the first hinge axis; the second hinge axis is fixedly connected to the second connecting rod, and the axial direction of the second hinge axis is perpendicular to the second connecting rod; the positioner connected to the second connecting rod is rotatably connected to the second hinge axis;

[0009] The two fixing components are respectively arranged at the connection between the positioner and the first connecting rod and at the connection between the positioner and the second connecting rod, and the two fixing components are respectively used to keep the angle between the positioner and the first connecting rod and the angle between the positioner and the second connecting rod unchanged.

[0010] Optionally, the two side plates of the same positioner are respectively set as the first side plate and the second side plate, and the two first side plates are provided with accommodating grooves to accommodate the first connecting rod or the second connecting rod when the first side plate is perpendicular to the axis of the first connecting rod.

[0011] Optionally, arc grooves are provided on the first positioning surfaces of the two positioners; in an initial state, the arc grooves of the two positioners form a closed figure.

[0012] Optionally, an adjustment spring is connected between the first connecting rod and the second connecting rod, and the adjustment spring has a tendency to move the two positioners away from each other, but in an initial state, the stored force of the adjustment spring is smaller than the magnetic attraction force between the two positioners.

[0013] Optionally, the fixing assembly includes a top block and a fixing spring;

[0014] The top block between the first connecting rod and the positioner connected thereto can be movably installed on the positioner along the axis of the first connecting rod, a fixing spring is connected between the top block and the positioner, and the fixing spring has a tendency to move the top block toward the first connecting rod. In the initial state, the top block abuts against the first connecting rod, and there is friction between the two.

[0015] The top block between the second connecting rod and the locator connected to it can be installed on the locator movably along the axis of the second connecting rod. A fixed spring is connected between the top block and the locator. The fixed spring tends to move the top block toward the second connecting rod. In the initial state, the top block abuts against the second connecting rod, and there is friction between the two.

[0016] Optionally, the angle between the first positioning surface and the second positioning surface and / or the angle between the first positioning surface and the fourth positioning surface is a non-right angle.

[0017] Optionally, among the angles formed by the two first positioning surfaces, the two second positioning surfaces, the two third positioning surfaces and the two fourth positioning surfaces of the two positioners, any two angles are not equal.

[0018] Optionally, a V-shaped positioning groove is provided at a position where the third positioning surface and the fourth positioning surface are connected.

[0019] The beneficial effects of the present invention are as follows: the present invention can adjust the distance between the two positioners and the angle between the two positioners through the adjustment mechanism, thereby changing the angle between the positioning surfaces on the two positioners; the flexibility is improved, and it can adapt to the changing welding angle requirements in welding tasks, thereby broadening the application scope of traditional welding positioners.

[0020] Furthermore, after the welding of the two workpieces is completed, the first connecting rod is rotated relative to the second connecting rod, driving the two locators to rotate relative to each other. The positioning surfaces of the locators abut against the workpieces and push the workpieces. As the rotation angle of the locators increases, the contact area between the locators and the workpieces decreases, thereby reducing the magnetic force between the workpieces and the locators, thereby facilitating the separation of the locators from the workpieces.

[0021] Furthermore, by allowing the two positioners to rotate around the axes of the first hinge shaft and the second hinge shaft respectively, during welding, the positioner connected to the first connecting rod can be rotated around the axis of the first hinge shaft alone, or the positioner connected to the second connecting rod can be rotated around the axis of the second hinge shaft alone, or the two positioners can be rotated around the axes of the first hinge shaft and the second hinge shaft respectively, thereby forming a new angle between the two positioners, further improving the universality and flexibility of the welding positioning device. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 It is a front structural schematic diagram of the present invention;

[0025] Figure 3 It is a side structural schematic diagram of the present invention;

[0026] Figure 4 for Figure 3 Middle AA section cutaway view;

[0027] Figure 5 It is a schematic diagram of the state when two positioners in the present invention rotate 180° relative to each other around the axis of the first connecting rod;

[0028] Figure 6 for Figure 5 A schematic diagram of the front structure of

[0029] Figure 7 It is a schematic diagram of the state when the two positioners in the present invention rotate 90° around the axes of the first hinge shaft and the second hinge shaft respectively;

[0030] Figure 8 for Figure 7 A schematic diagram of the front structure of

[0031] Fig. 9 It is a schematic diagram of the state in the process of separating the locator and the workpiece;

[0032] Fig.10 for Figure 4 Enlarged image at the center X.

[0033] In the figure: 100, positioner; 111, first side plate; 112, second side plate; 113, receiving groove; 114, arc groove; 115, V-shaped positioning groove; 120, magnet; 130, first positioning surface; 140, second positioning surface; 150, third positioning surface; 160, fourth positioning surface; 200, adjustment mechanism; 210, first connecting rod; 211, first hinge axis; 220, second connecting rod; 221, second hinge axis; 230, adjustment spring; 300, fixing assembly; 310, top block; 320, fixing spring. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0035] like Figures 1 to 10 As shown, a welding positioning device for a steel structure arch bridge provided by an embodiment of the present invention includes an adjustment mechanism 200 , two positioners 100 and two fixing assemblies 300 .

[0036] The positioner 100 includes a magnet 120 and two side plates; the two side plates are spaced apart and have the same shape and size; the magnet 120 is disposed between the two side plates, the shape of the magnet 120 is consistent with the side plates, there is a preset distance between the edge of the magnet 120 and the edge of the side plates, and the three are fixedly connected by bolts; the peripheral wall surface of the positioner 100 includes a plurality of positioning surfaces connected end to end for fixing the workpiece, which are respectively set as a first positioning surface 130, a second positioning surface 140, a third positioning surface 150 and a fourth positioning surface 160.

[0037] The adjustment mechanism 200 is disposed between the two positioners 100 and is used to adjust the distance between the two positioners 100 and the angle between the two positioners 100; Figure 4 The adjustment mechanism 200 includes a first connecting rod 210, a second connecting rod 220, a first hinge shaft 211 and a second hinge shaft 221, which are respectively connected to two positioners 100; the first connecting rod 210 and the second connecting rod 220 are coaxially arranged, and the end of the first connecting rod 210 close to the second connecting rod 220 is inserted into the second connecting rod 220, and can move along its own axis and rotate around the axis; in the projection of the surface where the side plate is located, the projection of the axis of the first connecting rod 210 and the second connecting rod 220 is perpendicular to the first positioning surface 130. Projection; in the initial state, the two first positioning surfaces 130 are in contact with each other, the first hinge shaft 211 is fixedly connected to the first connecting rod 210, and the axial direction of the first hinge shaft 211 is perpendicular to the first connecting rod 210; the positioner 100 connected to the first connecting rod 210 is rotatably connected to the first hinge shaft 211; the second hinge shaft 221 is fixedly connected to the second connecting rod 220, and the axial direction of the second hinge shaft 221 is perpendicular to the second connecting rod 220; the positioner 100 connected to the second connecting rod 220 is rotatably connected to the second hinge shaft 221.

[0038] The two fixing components 300 are respectively disposed at one end where the two positioners 100 are connected to the adjustment group mechanism, and the fixing components 300 are used to keep the angle between the two positioners 100 unchanged.

[0039] It should be noted that: when the two positioners 100 are Figure 1 , Figure 5 In the state shown, that is, when the positioner 100 and the first hinge shaft 211 or the positioner 100 and the second hinge shaft 221 do not rotate relative to each other, the magnetic pole distribution is consistent with the magnetic pole distribution of the welding positioner 100 in the prior art; Figure 7In the state shown, that is, when the positioner 100 and the first hinge shaft 211 and / or the positioner 100 and the second hinge shaft 221 rotate relative to each other, the two are two independent magnetic parts; the magnetic poles in the two positioners 100 are distributed along the axial direction of the first connecting rod 210 and the second connecting rod 220, that is, the first positioning surface 130 of one positioner 100 is the N pole, and the end away from the first positioning surface 130 is the S pole, and the first positioning surface 130 of the other positioner 100 is the S pole, and the end away from the first positioning surface 130 is the N pole.

[0040] When in use, the surface of the first workpiece is made parallel to a positioning surface of a positioner 100. At this time, under the action of the magnet 120, the positioning surface of the positioner 100 is attached to the workpiece and magnetically connected; then the second workpiece is made to contact with another positioning surface of the positioner 100 or a positioning surface of another positioner 100 to complete the magnetic connection, so that the two workpieces maintain a preset angle unchanged, thereby providing positioning and support for the two workpieces during welding, and then the operator can complete the welding work between the two workpieces.

[0041] Among all the positioning surfaces of the two positioners 100, an angle can be formed between any two positioning surfaces, which can provide more positioning angles for welding work. When the angle between the two workpieces to be welded is different from the angles of the above angles, the first connecting rod 210 can be rotated around its own axis, so that the angle between the two positioners 100 changes. At the same time, the angle between any positioning surface of one positioner 100 and any positioning surface of the other positioner 100 changes accordingly, forming an angle different from the previous angle. When the angle between the two positioning surfaces on the two positioners 100 is equal to the required angle, the angle between the positioner 100 and the first connecting rod 210 and / or the angle between the positioner 100 and the second connecting rod 220 is fixed by the fixing assembly 300, so that the angle between the two positioners 100 remains unchanged.

[0042] In addition, by independently rotating the positioner 100 connected to the first link 210 around the axis of the first hinge shaft 211, or independently rotating the positioner 100 connected to the second link 220 around the axis of the second hinge shaft 221, the two positioners 100 can also be rotated around the axes of the first hinge shaft 211 and the second hinge shaft 221 respectively, thereby forming a new angle between the two positioners 100, further improving the universality and flexibility of the welding positioning device. When the angle between the positioners 100 is equal to the required angle, the angle between the positioner 100 and the first link 210 and / or the angle between the positioner 100 and the second link 220 is fixed by the fixing assembly 300, thereby keeping the angle between the two positioners 100 unchanged.

[0043] After the angle between the two positioners 100 is adjusted, the two workpieces are magnetically attracted to the two positioning surfaces to complete the support and positioning of the workpieces. The present invention adjusts the angle between the two positioners 100 through the adjustment mechanism 200, so that the angle between any positioning surface of one positioner 100 and any positioning surface of the other positioner 100 changes, thereby improving the use flexibility of the welding positioning device, being able to adapt to the changing welding angle requirements in welding tasks, and broadening the application scope of the traditional welding positioner 100.

[0044] In addition, after welding the two workpieces, when the positioner 100 needs to be removed from the workpieces, the workpieces and the positioner 100 are difficult to separate due to the strong magnetic force. At this time, the first connecting rod 210 is rotated relative to the second connecting rod 220. When the two are rotated relative to each other, the two positioners 100 are also rotated relative to each other, for example, Figure 1 The status changes to Fig. 9 as the rotation angle of the locator 100 increases, the contact area between the locator 100 and the workpiece decreases, thereby reducing the magnetic force between the workpiece and the locator 100, thereby facilitating the separation of the locator 100 from the workpiece.

[0045] In a further embodiment, Figure 4 , Fig.10 As shown, the fixing assembly 300 includes a top block 310 and a fixing spring 320; the top block 310 between the first connecting rod 210 and the positioner 100 connected thereto can be movably installed on the positioner 100 along the axis of the first connecting rod 210, and a fixing spring 320 is connected between the top block 310 and the positioner 100, and the fixing spring 320 has a tendency to move the top block 310 toward the first connecting rod 210. In the initial state, the top block 310 abuts against the first connecting rod 210, and there is friction between the two, so that the first connecting rod 210 and the positioner 100 connected thereto are 0 remains unchanged. When the operator rotates the positioner 100 relative to the first connecting rod 210, the force applied by the operator overcomes the friction between the top block 310 and the first connecting rod 210, and at the same time moves the top block 310 away from the first connecting rod 210, and the fixed spring 320 is compressed to accumulate force. When the relative rotation of the positioner 100 and the first connecting rod 210 stops, the fixed spring 320 is released, and the top block 310 abuts against the first connecting rod 210 again, so that the angle between the positioner 100 and the first connecting rod 210 remains unchanged.

[0046] The top block 310 between the second connecting rod 220 and the positioner 100 connected thereto can be movably installed on the positioner 100 along the axis of the second connecting rod 220. A fixing spring 320 is connected between the top block 310 and the positioner 100. The fixing spring 320 has a tendency to move the top block 310 toward the second connecting rod 220. In the initial state, the top block 310 abuts against the second connecting rod 220, and there is friction between the two, so that the angle between the second connecting rod 220 and the positioner 100 connected thereto remains unchanged. When the operator rotates the positioner 100 relative to the second connecting rod 220, the force applied by the operator overcomes the friction between the top block 310 and the second connecting rod 220, and at the same time moves the top block 310 away from the second connecting rod 220, and the fixed spring 320 is compressed to accumulate force. When the relative rotation of the positioner 100 and the second connecting rod 220 stops, the fixed spring 320 is released, and the top block 310 abuts against the second connecting rod 220 again, so that the angle between the positioner 100 and the second connecting rod 220 remains unchanged.

[0047] In a further embodiment, Figure 5 , Figure 7 , Fig. 9 As shown, the two side plates of the same positioner 100 are respectively set as the first side plate 111 and the second side plate 112, and the two first side plates 111 are provided with accommodating grooves 113 to accommodate the first connecting rod 210 or the second connecting rod 220 when the first side plate 111 is perpendicular to the axis of the first connecting rod 210.

[0048] During the welding process, when the positioner 100 connected to the second connecting rod 220 rotates 90° around the axis of the second hinge shaft 221, Figure 7 , Figure 8 , the second connecting rod 220 is in the receiving groove 113 of the first side plate 111 of the positioner 100. When the positioner 100 connected to the first connecting rod 210 rotates 90° around the axis of the first hinge shaft 211, the first connecting rod 210 is in the receiving groove 113 of the first side plate 111 of the positioner 100. By providing the receiving groove 113, the angle range of the positioner 100 rotating around the axis of the first hinge shaft 211 or the second hinge shaft 221 is larger, so as to adapt to different welding angles.

[0049] In a further embodiment, Figure 1 , Figure 2 and Figure 4As shown, the angle between the first positioning surface 130 and the second positioning surface 140 and / or the angle between the first positioning surface 130 and the fourth positioning surface 160 is a non-right angle. In the initial state, the angle between the two second positioning surfaces 140 is the first reference angle, and the angle between the two fourth positioning surfaces 160 is the second reference angle; through the non-right angle setting, after one of the positioners 100 rotates 180° around the axis of the first connecting rod 210, the angle formed by the second positioning surface 140 of one positioner 100 and the fourth positioning surface 160 of the other positioner 100 is different from the first reference angle and the second reference angle; thereby adapting to more welding angles, for example, the state of the two positioners 100 in the initial state is as follows: Figure 2 As shown, after one of the positioners 100 rotates 180° around the axis of the first connecting rod 210, the states of the two positioners 100 are as follows: Figure 5 and Figure 6 shown.

[0050] When producing the present welding positioning device, multiple welding positioning devices with different angles between the first positioning surface 130 and the second positioning surface 140 or different angles between the first positioning surface 130 and the fourth positioning surface 160 can be produced according to actual needs. Since the angles between the first positioning surface 130 and the second positioning surface 140 and / or the angles between the first positioning surface 130 and the fourth positioning surface 160 of the multiple welding positioning devices are different, after one of the positioners 100 rotates 180° around the axis of the first connecting rod 210, the angles formed by the second positioning surface 140 of one positioner 100 and the fourth positioning surface 160 of another positioner 100 in the multiple welding positioning devices are also different, thereby being able to adapt to more welding angles. Technical personnel in this field can select and match them according to actual needs.

[0051] In a further embodiment, Figure 1 , Figure 2 and Figure 7 As shown, arc grooves 114 are provided on the first positioning surfaces 130 of the two positioners 100; in the initial state, the arc grooves 114 of the two positioners 100 form a closed figure. Thus, while reducing the contact area of ​​the two first positioning surfaces 130, it is convenient for operators to carry and take the welding positioning device; at the same time, due to the presence of the arc grooves 114, the contact area of ​​the two first positioning surfaces 130 is reduced, and the magnetic attraction between the two is reduced, thereby reducing the external force that the operator needs to apply to the two positioners 100 when rotating or moving the two positioners 100 away, which is convenient for operators to use.

[0052] In a further embodiment, Figure 4As shown, an adjustment spring 230 is connected between the first connecting rod 210 and the second connecting rod 220. The adjustment spring 230 has a tendency to move the two positioners 100 away from each other, but in the initial state, the stored force of the adjustment spring 230 is less than the magnetic attraction between the two positioners 100. Therefore, when the operator uses it, the external force that the operator needs to apply to the two positioners 100 when rotating or moving the two positioners 100 away is further reduced, which is convenient for the operator to use. Furthermore, when the two positioners 100 approach each other under the action of the magnetic attraction, the elastic force released by the adjustment spring 230 offsets part of the magnetic attraction, thereby avoiding the worker being pinched due to the two positioners 100 approaching each other too quickly.

[0053] In a further embodiment, any two of the angles formed by the two first positioning surfaces 130, the two second positioning surfaces 140, the two third positioning surfaces 150 and the two fourth positioning surfaces 160 of the two positioners 100 are not equal. The welding positioning device can complete multi-angle positioning of the workpiece in the initial state. Those skilled in the art can select and match the angles of the above angles according to actual needs.

[0054] In a further embodiment, Figure 6 As shown, a V-shaped positioning groove 115 is provided at the position where the third positioning surface 150 and the fourth positioning surface 160 are connected, which further increases the positioning angle that the welding positioning device can provide during the welding process, and a V-shaped positioning groove 115 with other angles can also be provided at the position where the third positioning surface 150 and the second positioning surface 140 are connected. Those skilled in the art can select and match the angle of the V-shaped positioning groove 115 according to actual needs.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A welding positioning device for a steel structure arch bridge, characterized in that: It includes an adjustment mechanism, two positioners and two fixing components; The peripheral wall surface of the positioner includes a plurality of positioning surfaces connected end to end for fixing the workpiece, which are respectively set as a first positioning surface, a second positioning surface, a third positioning surface and a fourth positioning surface; the positioner includes two side plates of the same size and shape and a magnet fixedly connected between the two side plates; the angle between the first positioning surface and the second positioning surface and / or the angle between the first positioning surface and the fourth positioning surface is non-right angle; The adjusting mechanism is arranged between the two positioners for adjusting the distance between the two positioners and the angle between the two positioners; the adjusting mechanism comprises a first connecting rod, a second connecting rod, a first hinge axis and a second hinge axis; the first connecting rod and the second connecting rod are respectively connected to the two positioners; the first connecting rod and the second connecting rod are coaxially arranged, and the end of the first connecting rod close to the second connecting rod is inserted into the second connecting rod, and can move along its own axis and rotate around the axis; in the projection of the surface where the side plate is located, the projection of the axis of the first connecting rod and the second connecting rod is perpendicular to the projection of the first positioning surface; in the initial state, the two first positioning surfaces are in contact; the first hinge axis is fixedly connected to the first connecting rod, and the axial direction of the first hinge axis is perpendicular to the first connecting rod; the positioner connected to the first connecting rod is rotatably connected to the first hinge axis; the second hinge axis is fixedly connected to the second connecting rod, and the axial direction of the second hinge axis is perpendicular to the second connecting rod; the positioner connected to the second connecting rod is rotatably connected to the second hinge axis; The two fixing components are respectively arranged at the connection between the positioner and the first connecting rod and at the connection between the positioner and the second connecting rod, and the two fixing components are respectively used to keep the angle between the positioner and the first connecting rod and the angle between the positioner and the second connecting rod unchanged.

2. A welding positioning device for a steel structure arch bridge according to claim 1, characterized in that: The two side plates of the same positioner are respectively set as the first side plate and the second side plate. The two first side plates are provided with accommodating grooves to accommodate the first connecting rod or the second connecting rod when the first side plate is perpendicular to the axis of the first connecting rod.

3. A welding positioning device for a steel structure arch bridge according to claim 1, characterized in that: The first positioning surfaces of the two positioners are both provided with arc grooves; in the initial state, the arc grooves of the two positioners form a closed figure.

4. A welding positioning device for a steel structure arch bridge according to claim 1, characterized in that: An adjusting spring is connected between the first connecting rod and the second connecting rod. The adjusting spring has a tendency to move the two positioners away from each other. However, in an initial state, the stored force of the adjusting spring is smaller than the magnetic attraction between the two positioners.

5. The welding positioning device for a steel structure arch bridge according to claim 1, characterized in that: The fixing assembly includes a top block and a fixing spring; The top block between the first connecting rod and the positioner connected thereto can be movably installed on the positioner along the axis of the first connecting rod, a fixing spring is connected between the top block and the positioner, and the fixing spring has a tendency to move the top block toward the first connecting rod. In the initial state, the top block abuts against the first connecting rod, and there is friction between the two. The top block between the second connecting rod and the locator connected to it can be installed on the locator movably along the axis of the second connecting rod. A fixed spring is connected between the top block and the locator. The fixed spring tends to move the top block toward the second connecting rod. In the initial state, the top block abuts against the second connecting rod, and there is friction between the two.

6. A welding positioning device for a steel structure arch bridge according to any one of claims 1 to 5, characterized in that: Among the angles formed by the two first positioning surfaces, the two second positioning surfaces, the two third positioning surfaces and the two fourth positioning surfaces of the two positioners, any two angles are not equal.

7. A welding positioning device for a steel structure arch bridge according to claim 6, characterized in that: A V-shaped positioning groove is provided at the position where the third positioning surface and the fourth positioning surface are connected.

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