Positioning tool for square tube welding

Abstract

This invention provides a positioning fixture for welding square tubes, belonging to the field of welding fixture technology. It includes a support platform and a positioning plate. The positioning plate has a movable opening on its side near the center of the support platform, within which a movable plate is movably connected. An inclined block and a floating block are arranged on the inner side of the positioning plate. The inclined block is fixed to the movable plate, and the top of the floating block has an inclined portion adapted to the movable plate. Electromagnets are arranged below the positioning plate. This invention, by setting a movable plate on the positioning plate and arranging a floating block and an inclined block on its inner side, with the floating block driven by the magnetic field generated by the electromagnet, pushes the inclined block, causing the movable plate to move closer to the center of the support platform. This allows the rectangular frame formed by the square tubes to be quickly clamped and fixed. By turning the electromagnets on or off, the workpiece can be clamped or released, enabling the quick fixing of workpieces that are flipped during welding.

Description

Technical Field

[0001] This invention belongs to the field of welding tooling technology, specifically referring to a positioning tooling for welding square tubes. Background Technology

[0002] Square tubes, as a common structural profile, are widely used in building frames, machinery and equipment, pipelines, furniture, and steel structure engineering due to their regular cross-sectional shape, high bending strength, and ease of connection. Welding is the most important and reliable permanent connection method for square tubes, and its quality directly affects the strength, stability, and service life of the overall structure. Currently, conventional welding methods such as manual arc welding, carbon dioxide gas shielded welding, and tungsten inert gas welding are commonly used for square tube welding.

[0003] When using square tubing to weld rectangular frame structures, full-circumference welding is typically required at the joints to ensure joint strength. In actual welding operations, to achieve ideal weld accessibility and quality, the workpiece often needs to be rotated multiple times to ensure all parts to be welded are positioned appropriately. Currently, common welding positioning fixtures often use pneumatic cylinder clamping or threaded clamping to secure the workpiece.

[0004] Among them, the cylinder clamping method requires components such as cylinders, control valves and air supply systems, which makes the overall structure more complex and the installation and maintenance costs higher; while the thread clamping method has a simple structure, but the operation speed is slower, especially in the welding process where the workpiece needs to be flipped repeatedly. Each time it is flipped, it needs to be loosened and re-clamped, which not only increases the labor intensity of the operators, but also significantly extends the production cycle, resulting in a decrease in overall efficiency. Summary of the Invention

[0005] In view of the above situation and to overcome the defects of the prior art, the purpose of the present invention is to provide a positioning fixture for welding square tubes, so as to at least partially solve the problems mentioned in the background art.

[0006] The technical solution adopted by this invention is as follows: This invention proposes a positioning fixture for welding square tubes, comprising: The support platform has positioning plates fixed on all four sides of its top surface for positioning. The positioning plate has a movable opening on the side near the center of the support platform, and a movable plate is movably connected in the movable opening; The positioning plate is provided with an inclined block and a floating block on its inner side. The inclined block is fixed on the movable plate. The top of the floating block is provided with an inclined part that is adapted to the movable plate. When the floating block moves downward, the inclined part can push the inclined block to move horizontally, so that the movable plate moves closer to the center of the support platform. Each of the positioning plates is equipped with an electromagnet below it. The electromagnet is configured to generate a magnetic field that applies a magnetic attraction force to the floating block, so that the floating block moves downward.

[0007] Furthermore, an elastic element is provided below the floating block, and the floating block is disposed on the elastic element so that a floating gap is formed at the bottom of the floating block.

[0008] Furthermore, a limiting plate is fixed to the inner side of the positioning plate, and one side of the floating block slides along the limiting plate.

[0009] Furthermore, guide holes are provided at both ends of the inclined block, and guide pins corresponding to the guide holes are fixed at both ends of the limiting plate, with the guide pins slidably inserted into the guide holes.

[0010] Furthermore, a rubber plate is provided between the movable plate and the movable opening, and the movable plate is connected to the movable opening through the rubber plate.

[0011] Furthermore, welding joints are provided at all four corners of the support platform.

[0012] Furthermore, a positioning angle is provided inside the weld joint, and a cylinder is provided below the positioning angle. The telescopic end of the cylinder is connected to the positioning angle so that the cylinder can drive the positioning angle to rise or fall.

[0013] Furthermore, the electromagnet is fixed below the support platform, and the length of the electromagnet is greater than the length of the floating block.

[0014] Furthermore, a support frame is provided at the bottom of the support platform, and the cylinder is fixed on the support frame.

[0015] Beneficial effects: 1. By setting a movable plate on the positioning plate, and setting a floating block and an inclined block inside the positioning plate, and the floating block is driven by the magnetic field generated by the electromagnet, the inclined part of the floating block can push the inclined block, so that the movable plate moves closer to the center of the support platform, and the rectangular frame formed by the square tube is quickly clamped and fixed. By turning the electromagnet on or off, the workpiece can be clamped or released, so that the workpiece flipped during the welding process can be quickly fixed.

[0016] 2. By setting welding joints at the four corners of the support platform and setting up adjustable positioning angles at the welding joints, when installing the square tube, the cylinder pushes the positioning angles up to the welding joints, and the positioning angles position the weld of the square tube. After installation and positioning are completed, the electromagnet is activated, and after the position of the square tube is fixed, the cylinder drives the positioning angles down to expose the weld of the square tube. This achieves the positioning of the weld while avoiding interference with the welding process. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a positioning fixture for welding square tubes according to an embodiment of the present invention; Figure 2 This is a top view of a positioning fixture for welding square tubes according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the installation position of the movable plate in a positioning fixture for welding square tubes according to an embodiment of the present invention. Figure 4 This is a schematic diagram of the internal structure of the positioning plate in a positioning fixture for welding square tubes according to an embodiment of the present invention. Figure 5 This is a schematic diagram of the installation position of an electromagnet in a positioning fixture for welding square tubes according to an embodiment of the present invention. Figure 6 This is a schematic diagram of the internal structure of the positioning plate in a positioning fixture for welding square tubes according to an embodiment of the present invention. Figure 7 This is a schematic diagram showing the installation position of the guide pin in a positioning fixture for welding square tubes according to an embodiment of the present invention. Figure 8 This is a schematic diagram of the product structure for welding.

[0018] Among them, 1. Support platform; 101. Weld joint; 11. Support frame; 2. Electromagnet; 3. Positioning plate; 301. Movable opening; 302. Floating gap; 31. Movable plate; 32. Rubber plate; 33. Inclined block; 331. Guide hole; 34. Floating block; 341. Inclined part; 35. Elastic element; 36. Limiting plate; 37. Guide pin; 4. Positioning angle; 41. Cylinder.

[0019] The accompanying drawings are provided to further understand the embodiments and form part of the specification. They are used together with the embodiments for explanation and do not constitute a limitation on the embodiments. Detailed Implementation

[0020] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection.

[0021] In the description of the embodiments, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments and simplifying the description, and 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. Therefore, they should not be construed as limitations on the embodiments.

[0022] Combination Figure 1 As shown, an embodiment of the present invention provides a positioning fixture for welding square tubes, including a support platform 1, an electromagnet 2, and a positioning plate 3.

[0023] Positioning plates 3 are fixed on all four sides of the top surface of the support platform 1, and the four positioning plates 3 are arranged in a rectangular shape. The square tube to be welded is placed inside the corresponding positioning plate 3 and closely attached to the positioning plate 3. The positioning plate 3 positions the square tube to be welded and aligns the welding parts of the square tube.

[0024] Combination Figure 3 and Figure 4 As shown, the positioning plate 3 has a movable opening 301 on the side near the center of the support platform 1. A movable plate 31 is movably connected within the movable opening 301. An inclined block 33 and a floating block 34 are provided on the inner side of the positioning plate 3. The inclined block 33 is fixed to the movable plate 31. The top of the floating block 34 has an inclined portion 341 adapted to the movable plate 31. When the floating block 34 moves downward, the inclined portion 341 can push the inclined block 33 to move horizontally, so that the movable plate 31 moves closer to the center of the support platform 1 (e.g., ...). Figure 4 (As shown).

[0025] Furthermore, electromagnets 2 are installed below each positioning plate 3. These electromagnets 2 are configured to generate a magnetic field that applies a magnetic attraction force to the floating block 34, causing the floating block 34 to move downwards (e.g., ...). Figure 5 (As shown).

[0026] Thus, the square tube to be welded is placed inside the positioning plate 3 and pressed tightly against it. Then, the welding joints of the square tubes are aligned. At this point, the square tubes to be welded form a closed rectangular frame (e.g., Figure 8 As shown), and the welding point is inclined. Then, the electromagnet 2 is turned on. The magnetic field generated by the electromagnet 2 can generate magnetic attraction force on the floating block 34, causing the floating block 34 to move downward. It also pushes the inclined block 33 to move horizontally through the inclined part 341, so that the movable plate 31 moves closer to the center of the support platform 1, and applies inward squeezing force to the rectangular frame composed of square tubes. Through the movable plate 31 on the four positioning plates 3, the four sides of the rectangular frame composed of square tubes apply pressure inward, so that the rectangular frame surrounded by square tubes is quickly clamped and fixed.

[0027] When welding is completed on one side and it is necessary to flip it over, the movable plate 31 can be released quickly by disconnecting the electromagnet 2, thus removing the squeezing force on the opposite tube. After the flip is completed, the electromagnet 2 can be turned on again to quickly fix the rectangular frame composed of the opposite tube.

[0028] Furthermore, an elastic element 35 is provided below the floating block 34, and the floating block 34 is placed on the elastic element 35 so that a floating gap 302 is formed at the bottom of the floating block 34. When the floating block 34 moves downward under the magnetic attraction force, the elastic element 35 is compressed. When the magnetic force is removed, the elastic element 35 uses its own elastic recovery ability to push the floating block 34 upward, so that the floating block 34 is reset. Correspondingly, the movable plate 31 loses the squeezing force on the opposite tube and can be released quickly.

[0029] In an optional embodiment, the elastic element 35 is a rubber strip, which has good elasticity.

[0030] In a specific embodiment, the electromagnet 2 is fixed below the support platform 1, and the length of the electromagnet 2 is greater than the length of the floating block 34, so that the magnetic field generated by the electromagnet 2 can completely cover the floating block 34 and generate sufficient magnetic attraction force on the floating block 34.

[0031] Combination Figure 4 , Figure 5 and Figure 6 As shown, a limiting plate 36 is fixed on the inner side of the positioning plate 3. The floating block 34 is limited by the limiting plate 36, so that one side of the floating block 34 slides along the limiting plate 36 to prevent the floating block 34 from deviating.

[0032] Combination Figure 6 and Figure 7 As shown, guide holes 331 are provided at both ends of the inclined block 33, and guide pins 37 corresponding to the guide holes 331 are fixed at both ends of the limiting plate 36. The guide pins 37 are slidably inserted into the guide holes 331. Through the cooperation of the guide pins 37 and the guide holes 331, the inclined block 33 can only move along the axial direction of the guide pins 37, that is, along the horizontal direction, towards the center of the support platform 1, so that the movable plate 31 can apply pressure to the square tube.

[0033] Thus, when the electromagnet 2 is activated, the floating block 34 is attracted by the magnetic force and moves downward. During the movement, it is limited by the limiting plate 36, so that the floating block 34 can move vertically downward. At the same time, the inclined part 341 pushes the inclined block 33. Under the guidance of the guide pin 37 and the guide hole 331, the inclined block 33 moves horizontally towards the center of the support platform 1.

[0034] Combination Figure 3 and Figure 6As shown, a rubber plate 32 is provided between the movable plate 31 and the movable opening 301. The movable plate 31 is connected to the movable opening 301 through the rubber plate 32. While connecting the movable plate 31, the rubber plate 32 can also apply a certain elastic tension to the movable plate 31.

[0035] Thus, when the movable plate 31 is pushed toward the center of the support platform 1, the rubber plate 32 can be stretched. At this time, the rubber plate 32 is in a state of stored force. When the magnetic force is removed and the floating block 34 is pushed upward, the stretched rubber plate 32 can recover, thereby applying a pulling force to the movable plate 31, causing the movable plate 31 to move away from the center of the support platform 1.

[0036] It should be noted that when the workpiece is not clamped, the rubber plate 32 is in a flat state. Therefore, when the movable plate 31 moves, the rubber plate 32 can be stretched and stored.

[0037] Combination Figure 1 and Figure 2 As shown, welding ports 101 are provided at the four corners of the support platform 1. The position of the welding ports 101 corresponds to the welding position of the square tube. After the square tube is formed into a rectangular frame and fixed, the welding points at the four corners are located at the welding ports 101, so that the welding gun can perform welding.

[0038] Furthermore, a positioning angle 4 is provided inside the welding joint 101. The positioning angle 4 can be used to position the welding point of the square tube to ensure the positional accuracy of the welding point. A cylinder 41 is provided below the positioning angle 4. The telescopic end of the cylinder 41 is connected to the positioning angle 4 so that the cylinder 41 can drive the positioning angle 4 to rise or fall.

[0039] Thus, during the installation of the square tube, the positioning angle 4 is first raised to a position flush with the working surface of the support platform 1 using cylinder 41, precisely positioning it at the welding joint 101. After the square tube is placed on the support platform 1, it is initially positioned by the positioning plate 3 on the corresponding side. Then, the part of the square tube to be welded is placed inside the positioning angle 4, achieving precise alignment of the welding joint using the positioning angle 4. After all the square tubes are installed and the welding position is positioned using the positioning angle 4, the electromagnet 2 is activated to firmly clamp and fix the entire square tube. Subsequently, cylinder 41 drives the positioning angle 4 to descend, completely removing it and fully exposing the welding part of the square tube. This structure ensures precise positioning of the welding joint during the assembly stage and avoids interference with the welding operation during welding.

[0040] In an optional embodiment, a support frame 11 is provided at the bottom of the support platform 1, and the cylinder 41 is fixed on the support frame 11.

[0041] The working principle of this invention is as follows: During the square tube installation stage, the operator first activates cylinder 41, driving positioning angle 4 upward so that its top end is level with the welding joint 101 and at the same height as the working surface of support platform 1. Then, the square tubes to be welded are placed sequentially inside the positioning plates 3 on each side, ensuring the square tubes are tightly against the positioning plates 3. Through adjustment, the ends of each square tube segment to be welded are aligned, and the mating parts are accurately embedded into the positioning angle 4, which precisely positions the welding point of the square tube.

[0042] After all the square tubes are placed and aligned, they together form a closed rectangular frame (e.g., Figure 8 (As shown). Next, electromagnet 2 is activated. When energized, electromagnet 2 generates a magnetic field, creating a downward magnetic attraction force on floating block 34. Floating block 34, under the influence of the magnetic force, slides downward along limiting plate 36, and its upper inclined portion 341 pushes inclined block 33 accordingly. With the precise cooperation and guidance of guide pin 37 and guide hole 331, inclined block 33 transmits horizontal movement to movable plate 31, driving movable plate 31 to move smoothly towards the center of support platform 1. By synchronously applying uniform compressive force to the movable plates 31 on the four positioning plates 3, the rectangular frame composed of square tubes is quickly clamped and fixed, ensuring its stable position during welding.

[0043] After the clamping action is completed, the cylinder 41 drives the positioning angle 4 to descend, so that the square tube welding interface that was originally covered by the positioning angle 4 is fully exposed, so as to carry out subsequent welding operations. At the same time, during the downward movement of the floating block 34, the elastic element 35 is compressed and stores elastic potential energy; when the movable plate 31 moves inward, the rubber plate 32 is stretched and accumulates restoring force.

[0044] When welding on one side is complete and the workpiece needs to be flipped, simply disconnect the power supply to electromagnet 2. After the magnetic force disappears, the compressed elastic element 35 releases its stored potential energy, pushing the floating block 34 back to its initial position. Simultaneously, the stretched rubber plate 32 returns to its original shape, applying a reverse pulling force to the movable plate 31, causing it to move away from the center of the support platform 1, thus quickly releasing the clamping force on the parallel tube. After the workpiece is flipped, simply reconnect electromagnet 2 to trigger the clamping mechanism again, achieving rapid fixation of the parallel tube frame. The entire process significantly reduces locking time, improving the continuity and overall efficiency of welding operations.

[0045] In summary, by setting a movable plate 31 on the positioning plate 3 and arranging a floating block 34 and a cooperating inclined block 33 inside the positioning plate 3, a controllable clamping mechanism is constructed. The floating block 34 is driven to move under the magnetic field generated by the electromagnet 2, and its inclined front end 341 pushes the inclined block 33, thereby causing the movable plate 31 to smoothly shift towards the center of the support platform 1. Through this transmission process, a uniform inward compressive force is applied to the rectangular frame composed of square tubes, thereby achieving rapid and stable clamping of the assembled square tubes.

[0046] Correspondingly, simply disconnecting the power supply to electromagnet 2 eliminates the magnetic field effect, causing the floating block 34 to reset, and the movable plate 31 to lose its continuous squeezing effect on the opposite tube, allowing the workpiece to be released quickly. The entire clamping and releasing process can be completed simply by controlling the energization and de-energization of electromagnet 2, greatly improving operational efficiency. It is particularly suitable for workpieces that require frequent flipping and re-fixing during the welding process.

[0047] In addition, dedicated welding ports 101 are set at the four corners of the support platform 1, and each welding port 101 is equipped with a positioning angle 4 that can be raised and lowered by a cylinder 41. When installing the square tube, the positioning angle 4 is first raised to a position flush with the working surface of the support platform 1 by the cylinder 41, so that it is precisely positioned at the welding port 101. After the square tube is placed on the support platform 1, it is initially positioned by the positioning plate 3 on the corresponding side. Then, the part of the square tube to be welded is placed inside the positioning angle 4, and the positioning angle 4 achieves precise alignment of the welding point. After all the square tubes are installed and the welding position is positioned by means of the positioning angle 4, the electromagnet 2 is activated to firmly clamp and fix the entire square tube. Afterwards, the cylinder 41 drives the positioning angle 4 to descend, so that it is completely removed, allowing the welding part of the square tube to be fully exposed. This structure ensures precise positioning of the welding point during the assembly stage and avoids interference with the welding operation during welding.

[0048] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0049] The embodiments have been described above, and such description is not restrictive. The figures shown are only one embodiment, and the actual structure is not limited to this. In short, if a person skilled in the art is inspired by this description and designs a similar structure and embodiment without departing from the inventive spirit, such design should fall within the scope of protection.

Claims

1. A positioning tool for square tube welding, characterized by, include: The support platform (1) has positioning plates (3) fixed on all four sides of its top surface for positioning. The positioning plate (3) has an opening (301) on one side near the center of the support platform (1), and an movable plate (31) is movably connected in the opening (301). The positioning plate (3) is provided with an inclined block (33) and a floating block (34) on its inner side. The inclined block (33) is fixed on the movable plate (31). The top of the floating block (34) is provided with an inclined part (341) that is adapted to the movable plate (31). When the floating block (34) moves downward, the inclined part (341) can push the inclined block (33) to move horizontally, so that the movable plate (31) moves closer to the center of the support platform (1). Each of the positioning plates (3) is provided with an electromagnet (2) below it. The electromagnet (2) is configured to generate a magnetic field that applies a magnetic attraction force to the floating block (34) so ​​that the floating block (34) moves downward.

2. The positioning fixture for square tube welding according to claim 1, characterized in that: An elastic element (35) is provided below the floating block (34), and the floating block (34) is disposed on the elastic element (35) so that a floating gap (302) is formed at the bottom of the floating block (34).

3. The positioning fixture for welding square tubes according to claim 1, characterized in that: A limiting plate (36) is fixed to the inner side of the positioning plate (3), and one side of the floating block (34) slides along the limiting plate (36).

4. The positioning fixture for square tube welding according to claim 3, characterized in that: The inclined block (33) has guide holes (331) at both ends, and the limiting plate (36) has guide pins (37) corresponding to the guide holes (331) fixed at both ends. The guide pins (37) are slidably inserted into the guide holes (331).

5. The positioning fixture for welding square tubes according to claim 1, characterized in that: A rubber plate (32) is provided between the movable plate (31) and the movable opening (301), and the movable plate (31) is connected to the movable opening (301) through the rubber plate (32).

6. The positioning fixture for welding square tubes according to claim 1, characterized in that: The support platform (1) has welding joints (101) at each of its four corners.

7. The positioning fixture for welding square tubes according to claim 6, characterized in that: A positioning angle (4) is provided inside the welding joint (101), and a cylinder (41) is provided below the positioning angle (4). The telescopic end of the cylinder (41) is connected to the positioning angle (4) so ​​that the cylinder (41) can drive the positioning angle (4) to rise or fall.

8. The positioning fixture for welding square tubes according to claim 1, characterized in that: The electromagnet (2) is fixed below the support platform (1), and the length of the electromagnet (2) is greater than the length of the floating block (34).

9. The positioning fixture for welding square tubes according to claim 7, characterized in that: The bottom of the support platform (1) is provided with a support frame (11), and the cylinder (41) is fixed on the support frame (11).

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