Welding positioning device

Abstract

The application discloses a welding positioning device, which comprises a support, a first suction positioning member and a supporting assembly. The support is used for extending into the inner cavity of a fixed supporting leg and has a lower supporting surface. The first suction positioning member is arranged at the inner end of the support, and the downwardly arranged suction surface is flush with the lower supporting surface. The suction surface can fix and suck the lower sliding block of the fixed supporting leg. The supporting assembly comprises a supporting positioning member and a balance placing member. The supporting positioning member is arranged at the outer end of the support and has an upper supporting surface for placing the upper sliding block. The balance placing member is arranged at the outer end of the support. The balance placing member is used for supporting the support when the suction surface fixes and sucks the lower sliding block, so that the distance between the lower supporting surface and the fixed supporting leg is equal to the height of the lower sliding block, and the height precision and parallelism of the lower sliding block and the upper sliding block after welding can be met.

Description

Technical Field

[0001] This application belongs to the field of welding technology, specifically relating to a welding positioning device. Background Technology

[0002] Before lifting operations, a truck crane must extend its movable outriggers to support the vehicle body, expanding the support area and ensuring the center of gravity is stably positioned within the support range. The movable outriggers extend and retract within the fixed outriggers on the chassis. To ensure smooth extension and retraction of the movable outriggers, a certain clearance must be maintained between the height of the inner cavity of the fixed outrigger and the height of the movable outrigger. This clearance is primarily controlled by the height of the sliders at the upper and lower ends of the inner cavity of the fixed outrigger.

[0003] When the movable outrigger extends and bears the lifting load, the main load-bearing surface of the fixed outrigger is the surface of the upper and lower sliders. Therefore, the dimensional accuracy of the height of the upper and lower sliders of the fixed outrigger and the parallelism of the upper and lower slider surfaces are crucial. If the heights of the left and right sets of upper and lower sliders in the same inner cavity are inconsistent, or if the upper and lower sliders are not parallel, it will result in a reduced contact area when the movable outrigger is under force, or tilting when bearing load, affecting the force on the outrigger and operational safety.

[0004] Currently, the installation method for the upper and lower sliders involves welding the lower slider to the base plate of the fixed leg after the main welds of the two inner cavities of the fixed leg have been completed. Then, the upper slider is welded to the cover plate of the fixed leg. However, after the main welds of the inner cavities are completed, welding shrinkage and deformation are inevitable. Therefore, directly welding the upper slider to the cover plate makes it difficult to guarantee the height accuracy and parallelism of the upper and lower sliders, resulting in inconsistent heights or non-parallelism between the upper and lower sliders. Utility Model Content

[0005] In view of the above-mentioned defects or deficiencies, this application provides a welding positioning device, which aims to solve the technical problem of poor height accuracy and parallelism of the upper and lower sliders inside the fixed support leg.

[0006] To achieve the above objectives, this application provides a welding positioning device, wherein the welding positioning device includes:

[0007] A bracket, which extends into the cavity of the fixed outrigger and has a lower support surface;

[0008] The first suction positioning component is located at the inner end of the bracket and its suction surface is flush with the lower support surface. The suction surface can fix and suction the lower slider of the fixed support leg.

[0009] The support assembly includes a support positioning component and a balancing component. The support positioning component is located at the outer end of the bracket and has an upper support surface for placing the upper slider. The balancing component is located at the outer end of the bracket and is used to support the bracket when the lower slider is fixedly engaged by the suction surface, so that the distance between the lower support surface and the fixed support leg is equal to the height of the lower slider.

[0010] In this embodiment, the bracket is provided with a connection hole, and the balancing component includes a threaded fastener that passes through the connection hole, the height of which is adjustable.

[0011] In this embodiment, the bracket includes a body and a mounting plate connected together. Both ends of the mounting plate extend out of the body and are formed with connection holes. Threaded fasteners are inserted into each connection hole.

[0012] In this embodiment, a perforated hole is formed on the bracket, and the mounting plate is placed inside the perforated hole and connected to the periphery of the perforated hole. Both ends of the mounting plate extend out of the perforated hole.

[0013] In this embodiment, the balancing component has a first mounting head and a second mounting head disposed on both sides of the mounting plate, and a threaded fastener is threadedly connected to the first mounting head and the second mounting head.

[0014] In this embodiment, the threaded fastener has a support head at the end furthest from the bracket, and the support head is used to support the fixed leg.

[0015] In this embodiment, the lower support surface has an inwardly recessed mounting groove, and the first suction positioning member is located in the mounting groove and is detachably connected to the groove wall.

[0016] In this embodiment, the first attraction and positioning element is a magnet.

[0017] In this embodiment, the bracket is a one-piece metal component.

[0018] In this embodiment, the bracket includes a body and an extension extending outward from the outer contour of the body and along the length direction of the body. The body has a lower support surface, and a support positioning member is provided on the extension.

[0019] In this embodiment, the extension portion has a mounting block, which extends out of the extension portion on both sides along the thickness direction of the extension portion, and the support positioning member is detachably connected to the mounting block.

[0020] In this embodiment of the application, the welding positioning device further includes a second suction positioning member disposed on the side of the bracket, which is used to suction and fix with the cavity wall of the inner cavity.

[0021] In this embodiment of the application, the welding positioning device further includes a limiting member disposed at the outer end of the bracket and placed horizontally, the limiting member being used to abut against the end of the fixed support leg.

[0022] In this embodiment, the inner end dimension of the bracket is smaller than the outer end dimension.

[0023] Through the above technical solution, the welding positioning device provided in this application embodiment has the following beneficial effects:

[0024] In the technical solution of this application, the lower slider is welded to the base plate of the fixed leg, and then the bracket is inserted into the inner cavity of the fixed leg. The suction surface of the first suction positioning member is suctioned and fixed to the lower slider, so that the position of the bracket is fixed. The balancing placement member is supported on the base plate of the fixed leg, so that the distance between the lower support surface and the base plate of the fixed leg is equal to the height of the lower slider, that is, the lower support surface is parallel to the base plate. At this time, the first suction positioning member and the lower slider are firmly and closely attached, and the distance between the upper support surface and the lower support surface meets the height accuracy and parallelism requirements of the lower slider and the upper slider. Therefore, it is only necessary to place the upper slider on the upper support surface of the support positioning member, and then weld the upper slider to the cover plate of the fixed leg. By using the welding positioning device in this application to position the lower slider and the upper slider, the welded lower slider and the upper slider can meet the height accuracy and parallelism requirements, improving the stability and reliability of the fixed leg. In addition, the balancing placement member can support the outer end of the bracket, so that the lower support surface remains horizontal.

[0025] Other features and advantages of the embodiments of this application will be described in detail in the following detailed description section. Attached Figure Description

[0026] The accompanying drawings are provided to further illustrate the embodiments of this application and form part of the specification. They are used together with the following detailed description to explain the embodiments of this application, but do not constitute a limitation on the embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without any inventive effort. In the drawings:

[0027] Figure 1 This is a schematic diagram of the structure of the fixed support leg according to an embodiment of this application;

[0028] Figure 2 This is a schematic diagram of the connection structure of the welding positioning device and the fixed support leg according to an embodiment of this application from one perspective;

[0029] Figure 3 yes Figure 2 A magnified view of a portion of point A in the middle;

[0030] Figure 4This is a schematic diagram of the connection structure of the welding positioning device and the fixed support leg according to an embodiment of this application from another perspective;

[0031] Figure 5 This is a schematic diagram of the welding positioning device according to an embodiment of the present application from one perspective;

[0032] Figure 6 This is a schematic diagram of the welding positioning device according to an embodiment of this application from another perspective;

[0033] Figure 7 This is a structural schematic diagram of a welding positioning device according to an embodiment of this application from another perspective.

[0034] Explanation of reference numerals in the attached figures

[0035] Detailed Implementation

[0036] The specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this application.

[0037] The descriptions of directions such as "up", "down", "front", "back", "left", and "right" in this application are as follows: Figure 1 The directions shown are for reference only and are used to interpret the location. Figure 1 The relative positional relationship between the components in the shown posture is such that if the specific posture changes, the directional indication will also change accordingly.

[0038] The welding positioning device of this application is described below with reference to the accompanying drawings.

[0039] like Figure 1 As shown, the fixed support leg 70 has two inner cavities 71, one on the left and one on the right. Each inner cavity 71 contains two lower sliders 72 and two upper sliders 73 distributed in the left-right direction. The lower sliders 72 and upper sliders 73 are distributed in the up-down direction. The height dimensional accuracy and parallelism requirements of the lower sliders 72 and upper sliders 73 are high. Currently, the installation of the lower sliders 72 and upper sliders 73 is done after the main welds of the two inner cavities 71 of the fixed support leg 70 have been completed. The lower sliders 72 are first welded firmly to the base plate 74 of the fixed support leg 70, and then the upper sliders 73 are tack welded onto the cover plate 75 of the fixed support leg 70. However, after the main welds of the inner cavities 71 are completed, welding shrinkage and deformation are inevitable. Therefore, it is difficult to guarantee the height accuracy and parallelism between the lower sliders 72 and upper sliders 73 by directly placing the upper sliders 73 on the port of the cover plate 75, which may result in inconsistent heights or non-parallelism.

[0040] like Figures 2 to 7As shown, this application provides a welding positioning device, which includes a bracket 10, a first suction positioning member 20, and a support assembly. The bracket 10 is used to extend into the inner cavity 71 of the fixed support leg 70 and has a lower support surface 11. The first suction positioning member 20 is located at the inner end 17 of the bracket 10 and its suction surface 21 is flush with the lower support surface 11. The suction surface 21 can fix and suction the lower slider 72 of the fixed support leg 70. The support assembly includes a support positioning member 30 and a balancing placement member 40. The support positioning member 30 is located at the outer end 18 of the bracket 10 and has an upper support surface 31 for placing the upper slider 73. The balancing placement member 40 is located at the outer end 18 of the bracket 10 and is used to support the bracket 10 when the suction surface 21 fixes and suctions the lower slider 72, so that the distance between the lower support surface 11 and the fixed support leg 70 is equal to the height of the lower slider 72.

[0041] Please see Figure 4 The lower slider 72 is welded to the base plate 74 of the fixed leg 70. Then, the bracket 10 is inserted into the inner cavity 71 of the fixed leg 70. The suction surface 21 of the first suction positioning member 20 is suctioned and fixed to the lower slider 72, so that the position of the bracket 10 is fixed. The leveling and placing member 40 is supported on the base plate 74 of the fixed leg 70, so that the distance between the lower support surface 11 and the base plate 74 of the fixed leg 70 is equal to the height of the lower slider 72, that is, the lower support surface 11 is parallel to the base plate 74. At this time, the first suction positioning member 20 and the lower slider 72 are suctioned firmly and fit together. The distance between the upper support surface 31 and the lower support surface 11 meets the height accuracy and parallelism requirements of the lower slider 72 and the upper slider 73. Therefore, it is only necessary to place the upper slider 73 on the upper support surface 31 of the support positioning member 30, and then weld the upper slider 73 to the cover plate 75 of the fixed leg 70. By using the welding positioning device described in this application to position the lower slider 72 and the upper slider 73, the welded lower slider 72 and upper slider 73 can meet the requirements for height accuracy and parallelism, thereby improving the stability and reliability of the fixed support leg 70. Furthermore, the balancing component 40 can support the outer end 18 of the bracket 10, ensuring that the lower support surface 11 remains horizontal.

[0042] In the embodiments of this application, please refer to Figure 6 and Figure 7 The bracket 10 is provided with a connection hole 131. The flattening component 40 includes a threaded fastener 44 that passes through the connection hole 131. The height of the threaded fastener 44 is adjustable.

[0043] The connecting hole 131 extends vertically, and the threaded fastener 44 passes through the connecting hole 131 with an adjustable height. Figure 7As shown, the lower end of the threaded fastener 44 extends out of the bracket 10. By tightening the threaded fastener 44, the distance between the lower support surface 11 and the base plate 74 of the fixed leg 70 can be adjusted to accommodate lower sliders 72 of different heights, making the welding positioning device more flexible and convenient to use. The greater the length of the lower end of the threaded fastener 44 extending out of the bracket 10, the greater the distance between the lower support surface 11 and the base plate 74 of the fixed leg 70, accommodating lower sliders 72 with larger heights. Conversely, the smaller the length of the lower end of the threaded fastener 44 extending out of the bracket 10, the smaller the distance between the lower support surface 11 and the base plate 74 of the fixed leg 70, accommodating lower sliders 72 with smaller heights.

[0044] Furthermore, the threaded connection enables self-locking, making the connection between the threaded fastener 44 and the bracket 10 more stable and reliable.

[0045] Understandably, the adjustment and preparation of the welding positioning device can be completed before welding. Please refer to [link / reference needed]. Figure 5 Place the lower slider 72, which needs to be welded, on the mounting platform 80, and then fix the first suction positioning component 20 to the lower slider 72. Adjust the distance between the bottom end of the balancing placement component 40 and the lower support surface 11 to be equal to the height of the lower slider 72, so that the front and rear ends of the bracket 10 are level, the lower support surface 11 is parallel to the mounting platform 80, and the distance between the lower support surface 11 and the mounting platform 80 is consistent at both ends and equal to the height of the lower slider 72. Measure whether the distance between the lower support surface 11 and the upper support surface 31 meets the height accuracy and parallelism requirements of the lower slider 72 and the upper slider 73. After meeting the height accuracy requirements, fix the balancing placement component 40, and the welding positioning device can be used in batches.

[0046] If the inner cavity 71 of the fixed leg 70 is large enough, the distance between the lower support surface 11 and the base plate 74 can be measured, so that the distance between the lower support surface 11 and the base plate 74 is consistent at both ends and equal to the height of the lower slider 72. Alternatively, the base plate 74 of the fixed leg 70 can be used as the installation platform 80, and the adjustment preparation work for the welding positioning device can be carried out on the base plate 74 of the fixed leg 70.

[0047] In one embodiment, the threaded fastener 44 is a bolt, and the hole wall of the connecting hole 131 is formed with a threaded section for the bolt to be threaded.

[0048] In another embodiment, the balancing component 40 can also be a wedge block that can move up and down, so that the height of the balancing component 40 can be adjusted.

[0049] In the embodiments of this application, please refer to Figure 7The bracket 10 includes a body 12 and a mounting plate 13 connected to each other. Both ends of the mounting plate 13 extend out of the body 12 and are formed with connection holes 131. Each connection hole 131 is provided with a threaded fastener 44.

[0050] The mounting plate 13 is connected to the body 12 to achieve the installation and fixation of the mounting plate 13. Both the left and right ends of the mounting plate 13 extend outside the body 12, and both the left and right ends of the mounting plate 13 have connecting holes 131. Threaded fasteners 44 are inserted into both connecting holes 131. By setting two connecting holes 131 and threaded fasteners 44, the force on the bracket 10 is more even, and the bracket 10 can be stably supported on the base plate 74 of the fixed leg 70.

[0051] In the embodiments of this application, please refer to Figure 7 The bracket 10 has a perforated hole 14, the mounting plate 13 is placed inside the perforated hole 14 and connected to the periphery of the perforated hole 14, and both ends of the mounting plate 13 extend out of the perforated hole 14.

[0052] Since the upper slider 73 and the lower slider 72 are far apart in the front-to-back direction, the weight of the bracket 10 can be reduced by setting the perforated hole 14, making the welding positioning device more convenient to use. The mounting plate 13 is placed in the perforated hole 14, and the mounting plate 13 is connected to the periphery of the perforated hole 14 to realize the installation and fixation of the mounting plate 13.

[0053] In the embodiments of this application, please refer to Figure 7 The balancing component 40 has a first mounting head 41 and a second mounting head 42 respectively located on both sides of the mounting plate 13, and the threaded fastener 44 is threadedly connected to the first mounting head 41 and the second mounting head 42.

[0054] At this time, no threaded section is provided in the connecting hole 131 on the mounting plate 13. The first mounting head 41 is located on the upper side of the mounting plate 13, and the second mounting head 42 is located on the lower side of the mounting plate 13. The threaded fastener 44 is threadedly connected to the first mounting head 41 and the second mounting head 42. When the front and rear ends of the bracket 10 are adjusted to be level, the lower support surface 11 is parallel to the mounting platform 80, and the distance between the lower support surface 11 and the mounting platform 80 is consistent at both ends and equal to the height of the lower slider 72, so that the first mounting head 41 and the second mounting head 42 are respectively pressed against the upper and lower sides of the mounting plate 13, thereby fixing the position of the threaded fastener 44.

[0055] In the embodiments of this application, please refer to Figure 7The threaded fastener 44 has a support head 43 at the end away from the bracket 10, which is used to support the fixed leg 70. By setting the support head 43, the contact area between the threaded fastener 44 and the fixed leg 70 is increased, so that the welding positioning device can be placed more stably and reliably in the inner cavity 71 of the fixed leg 70.

[0056] In one embodiment, the threaded fastener 44 is a bolt, the head of the bolt is a support head 43, and the first mounting head 41 and the second mounting head 42 are nuts fitted onto the bolt's thread.

[0057] In the embodiments of this application, please refer to Figure 6 The lower support surface 11 has an inwardly recessed mounting groove 111, and the first suction positioning member 20 is located in the mounting groove 111 and is detachably connected to the groove wall of the mounting groove 111.

[0058] The lower support surface 11 has an inwardly recessed mounting groove 111 at its rear end, extending vertically. The first suction positioning member 20 is located within the mounting groove 111, with its lower surface flush with the lower support surface 11. The lower surface of the first suction positioning member 20 is attracted and fixed to the lower slider 72. The first suction positioning member 20 is detachably connected to the groove wall of the mounting groove 111, facilitating replacement of the first suction positioning member 20 after wear and improving its usability.

[0059] For example, the first suction positioning member 20 and the groove wall of the mounting groove 111 can be detachably connected by bolts, rivets, clips or other structures.

[0060] In the embodiments of this application, please refer to Figure 6 The first attraction and positioning component 20 is a magnet, and the lower slider 72 is made of iron material, which makes the magnet attraction and fixation easy to assemble and disassemble, reusable, highly accurate in alignment, and non-destructive connection.

[0061] Based on this, wear-resistant blocks 19 are provided on the front and rear sides of the first attraction positioning member 20. By providing wear-resistant blocks 19, the magnet in the middle can be protected, the wear on the magnet surface can be reduced, and the service life of the magnet can be extended.

[0062] In the embodiments of this application, please refer to Figure 6 The bracket 10 is designed as a one-piece metal component, which saves assembly steps, reduces assembly errors, and makes the bracket 10 have high structural strength.

[0063] In the embodiments of this application, please refer to Figure 6The bracket 10 includes a body 12 and an extension 15 extending outward from the outer contour of the body 12 and along the length direction of the body 12. The body 12 has a lower support surface 11, and the extension 15 is provided with a support positioning member 30.

[0064] The extension portion 15 extends in the front-to-back direction. The extension portion 15 is connected to the rear end of the body 12 and extends out from the outer contour of the body 12. The support positioning member 30 is provided on the extension portion 15. The extension portion 15 facilitates the installation of the support positioning member 30 and also avoids interference between the bracket 10 and the upper slider 73 during welding, making the welding positioning device more convenient to use.

[0065] In the embodiments of this application, please refer to Figure 7 The extension portion 15 has a mounting block 151, which extends out of the extension portion 15 on both sides along the thickness direction of the extension portion 15. The support positioning member 30 is detachably connected to the mounting block 151.

[0066] The support positioning component 30 is detachably connected to the mounting block 151, facilitating replacement of the support positioning component 30 after wear. Different support positioning components 30 can also be used depending on the different upper slider 73, or the different height dimensions of the upper slider 73 and lower slider 72, increasing the flexibility of the support positioning component 30. The mounting block 151 extends beyond the outer extension 15 on both sides, increasing the connection area between the support positioning component 30 and the bracket 10, allowing for a more stable and reliable installation of the support positioning component 30 on the bracket 10. Specifically, the support positioning component 30 and the mounting block 151 are detachably connected by bolts, which are readily available and easy to install.

[0067] In the embodiments of this application, please refer to Figure 3 The welding positioning device also includes a second suction positioning member 50 disposed on the side of the bracket 10, which is used to suction and fix with the cavity wall of the inner cavity 71.

[0068] The second suction positioning component 50 is located on the left and right sides of the bracket 10. By setting the second suction positioning component 50 to be suctioned and fixed to the cavity wall of the inner cavity 71, the connection between the welding positioning device and the fixed support leg 70 is more stable and reliable, and the welding positioning device can be prevented from being placed at an angle.

[0069] like Figure 2 As shown, when welding the upper slider 73, the first suction positioning member 20 is first suction-fixed to the lower slider 72, and the second suction positioning member 50 is suction-fixed to the central plate 76 or web plate 77 of the fixed support leg 70, so that the welding positioning device can be stably placed in the inner cavity 71. Then the upper slider 73 is placed on the support positioning member 30 for welding.

[0070] Based on this, the second attraction positioning member 50 is set as a magnet, and the central plate 76 and the web plate 77 are made of iron material, so that the second attraction positioning member 50 can be stably attracted and fixed with the central plate 76 and the web plate 77.

[0071] like Figure 3 As shown, a mounting base 16 is provided on the bracket 10, and the second suction positioning component 50 can be detachably connected to the mounting base 16, which facilitates the replacement of the second suction positioning component 50 after wear and improves the flexibility of the second suction positioning component 50 in use.

[0072] In the embodiments of this application, please refer to Figure 3 The welding positioning device also includes a limiting member 60 located at the outer end 18 of the bracket 10 and placed horizontally, the limiting member 60 being used to abut against the end of the fixed support leg 70.

[0073] The limiting member 60 is located at the rear end of the bracket 10, and the limiting member 60 is horizontal, that is, it extends in the left and right direction. The limiting member 60 is used to abut against the end of the fixed support leg 70 to limit the length of the bracket 10 extending into the inner cavity 71, so as to prevent the bracket 10 from extending too far into the inner cavity 71 and causing the upper slider 73 to shift, making the use of the welding positioning device more convenient.

[0074] In the embodiments of this application, please refer to Figure 4 The inner end 17 of the bracket 10 is smaller than the outer end 18, which can guide the bracket 10 to extend into the inner cavity 71 more smoothly, making it easier for the bracket 10 to extend into the inner cavity 71 and making the use of the welding positioning device more convenient.

[0075] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0076] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0077] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in 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.

[0078] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A welding positioning device, characterized in that, The welding positioning device includes: A bracket (10) is used to extend into the cavity (71) of the fixed leg (70) and has a lower support surface (11); The first suction positioning component (20) is located at the inner end (17) of the bracket (10) and the suction surface (21) facing downward is flush with the lower support surface (11). The suction surface (21) can fix and suction the lower slider (72) of the fixed support leg (70). The support assembly includes a support positioning member (30) and a leveling member (40). The support positioning member (30) is located at the outer end (18) of the bracket (10) and has an upper support surface (31) for placing the upper slider (73). The leveling member (40) is located at the outer end (18) of the bracket (10). The leveling member (40) is used to support the bracket (10) when the lower slider (72) is fixedly attracted by the suction surface (21), so that the distance between the lower support surface (11) and the fixed support leg (70) is equal to the height of the lower slider (72).

2. The welding positioning device according to claim 1, characterized in that, The bracket (10) is provided with a connection hole (131), and the balancing component (40) includes a threaded fastener (44) that passes through the connection hole (131), and the height of the threaded fastener (44) is adjustable.

3. The welding positioning device according to claim 2, characterized in that, The bracket (10) includes a body (12) and a mounting plate (13) connected to each other. Both ends of the mounting plate (13) extend out of the body (12) and are formed with connection holes (131). Each connection hole (131) is provided with a threaded fastener (44).

4. The welding positioning device according to claim 3, characterized in that, The bracket (10) has a perforated hole (14), the mounting plate (13) is placed inside the perforated hole (14) and connected to the periphery of the perforated hole (14), and both ends of the mounting plate (13) extend out of the perforated hole (14).

5. The welding positioning device according to claim 3, characterized in that, The balancing component has a first mounting head (41) and a second mounting head (42) respectively disposed on both sides of the mounting plate (13), and the threaded fastener (44) is threadedly connected to the first mounting head (41) and the second mounting head (42). And / or, the threaded fastener (44) has a support head (43) at one end away from the bracket (10), the support head (43) being used to support the fixed leg (70).

6. The welding positioning device according to any one of claims 1 to 5, characterized in that, The lower support surface (11) has an inwardly recessed mounting groove (111), and the first suction positioning member (20) is located in the mounting groove (111) and is detachably connected to the groove wall of the mounting groove (111). And / or, the first attraction positioning element (20) is a magnet; And / or, the bracket (10) is a one-piece metal component.

7. The welding positioning device according to any one of claims 1 to 5, characterized in that, The bracket (10) includes a body (12) and an extension (15) extending outward from the outer contour of the body (12) and along the length direction of the body (12). The body (12) has the lower support surface (11), and the extension (15) is provided with the support positioning member (30).

8. The welding positioning device according to claim 7, characterized in that, The extension portion (15) has a mounting block (151), which extends out of the extension portion (15) on both sides along the thickness direction of the extension portion (15). The support positioning member (30) is detachably connected to the mounting block (151).

9. The welding positioning device according to any one of claims 1 to 5, characterized in that, The welding positioning device further includes a second suction positioning member (50) disposed on the side of the bracket (10), the second suction positioning member (50) being used to suction and fix with the cavity wall of the inner cavity (71).

10. The welding positioning device according to any one of claims 1 to 5, characterized in that, The welding positioning device also includes a limiting member (60) located at the outer end (18) of the bracket (10) and placed horizontally, the limiting member (60) being used to abut against the end of the fixed leg (70); And / or, the inner end (17) of the bracket (10) is smaller than the outer end (18).

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