Welding workpiece clamp and welding apparatus

Abstract

The utility model relates to welding technical field discloses a kind of welding workpiece fixture and welding equipment, to improve the stress uniformity and weld quality in the process of sheet workpiece welding. The welding workpiece fixture includes: platen;With the platen oppositely arranged pressing plate, for workpiece is pressed between the two;Force transmission plate, including bottom plate and oppositely arranged side plate in its two sides, constitute U-shaped groove body;Bending moment square tube, at least part enters the groove body;Air bag, located in groove body and filled between force transmission plate and bending moment square tube. By air bag uniform force transmission and the rapid heat dissipation of heat conduction plate, single-sided welding double-sided forming can be realized, and welding stress and deformation are reduced. The fixture structure is light, suitable for equipment, high altitude and other various working conditions, and has strong adaptability.

Description

Technical Field

[0001] This utility model relates to the field of welding technology, specifically to a welding workpiece fixture and welding equipment. Background Technology

[0002] In the field of machinery manufacturing, large steel mills typically use specialized welding equipment for welding large-sized, multi-material (mainly carbon steel and stainless steel) thin sheet metal parts, while general manufacturing enterprises often rely on tooling and mechanical structures for clamping when welding such products. Because existing clamping devices generally use threaded clamping or cylinder pressing, the stress on the sheet metal parts to be welded is uneven along the boundary of the entire weld seam, directly affecting the welding quality.

[0003] When using long, straight weld seams during welding, the high heat input causes rapid, localized heating of the workpiece, while the long cooling time leads to stress accumulation. Current technologies rely on simultaneous welding and cooling to eliminate stress, but this is inefficient and results in inconsistent weld quality. If stress control is inadequate, the workpiece is highly susceptible to severe wavy deformation. Utility Model Content

[0004] To address the above problems, this utility model provides a welding workpiece fixture and welding equipment, which can improve the uniformity of force on the workpiece.

[0005] According to a first aspect of the present invention, a welding workpiece fixture is provided, comprising: a platform; a pressure plate disposed opposite to the platform, the pressure plate being used to press the workpiece against the pressure plate and the platform; a force transmission plate comprising a base plate and two side plates, the base plate abutting against the pressure plate, the two side plates being disposed opposite each other on both sides of the base plate to form a U-shaped groove; a moment-resisting square tube, at least a portion of which enters the groove; and an airbag located within the groove and filling the space between the force transmission plate and the moment-resisting square tube.

[0006] In some possible implementations, a first heat-conducting plate is embedded in the workpiece contact surface of the pressure plate.

[0007] In some possible implementations, a second heat-conducting plate is embedded in the workpiece contact surface of the platform.

[0008] In some possible implementations, the welding workpiece fixture also includes end positioning bolts, one end of which is fastened to the end of the moment-resisting square tube along its length, and the other end of which is fastened to the platform.

[0009] In some possible implementations, the airbag is positioned centrally relative to the bending moment square tube along its length.

[0010] In some possible implementations, the length of the airbag is 85%-95% of the length of the bending moment-resistant square tube.

[0011] In some possible implementations, the length of the airbag is greater than the maximum width of the workpiece.

[0012] In some possible implementations, the welding workpiece fixture also includes a frame that presses against the end of the moment-resisting square tube away from the force-transmitting plate.

[0013] According to a second aspect of the present invention, a welding apparatus is provided, comprising a welding workpiece clamp as described in any of the first aspects.

[0014] In some possible implementations, the welding equipment is a butt welding equipment, comprising at least two welding workpiece clamps, each clamp holding a plate-shaped workpiece to complete the butt welding of two coplanar plate-shaped workpieces. Attached Figure Description

[0015] Figure 1 A schematic diagram (cross-sectional view) of a welding workpiece fixture provided for an embodiment of this utility model.

[0016] Figure 2 A partial enlarged schematic diagram (side view) of a welding workpiece fixture provided for an embodiment of this utility model.

[0017] Figure 3 A schematic diagram of another welding workpiece fixture provided for an embodiment of this utility model.

[0018] Figure label:

[0019] 1-Platform; 2-Pressure plate; 3-Force transmission plate; 4-Moment-resistant square tube; 5-Airbag; 21-First heat-conducting plate; 11-Second heat-conducting plate; 6-End positioning bolt; 12-End positioning block; 7-Stiffening rib plate; 8-Lower end plate; 9-First welded workpiece; 10-Second welded workpiece; 20-Bottom frame assembly; 22-Connecting bolt; 23-Upper beam assembly; 24-Positioning component. Detailed Implementation

[0020] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0022] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0023] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0024] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. In addition, the character " / " in this document generally indicates that the related objects before and after it have an "or" relationship.

[0025] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0026] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to 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 of this application.

[0027] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" 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 or an electrical connection; 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. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0028] To achieve high-quality single-sided welding with double-sided forming, and to adapt to different working positions (such as on equipment or at height), this embodiment provides a lightweight, efficient, and flexible welding workpiece fixture.

[0029] Figure 1 A schematic diagram (cross-sectional view) of a welding workpiece fixture provided for an embodiment of this utility model. Figure 2 This is a partial enlarged structural schematic diagram (side view) of a welding workpiece fixture provided for an embodiment of this utility model. For example... Figure 1 and Figure 2 As shown, the welding workpiece fixture includes: a platform 1, a pressure plate 2, a force transmission plate 3, a bending moment resisting square tube 4, and an airbag 5.

[0030] In this embodiment of the invention, the pressure plate 2 and the platform 1 are arranged opposite to each other. The pressure plate 2 is used to press the workpieces (the first welded workpiece 9 and the second welded workpiece 10) against each other between the pressure plate 2 and the platform 1. The force transmission plate 3 has a U-shaped cross-section, including a bottom plate and two side plates. The bottom plate abuts against the pressure plate 2, and the two side plates are opposite each other on both sides of the bottom plate to form a groove. At least a portion of the moment-resistant square tube 4 enters the groove formed by the cross-section of the force transmission plate 3. The airbag 5 is located in the groove and fills the space between the force transmission plate 3 and the moment-resistant square tube 4. In this way, the force transmission plate 3 can limit the position of the airbag 5, keep the position of the airbag stable, control the airbag to be uniformly ventilated throughout the whole, and ensure that the pressure of the airbag is uniformly transmitted throughout the whole. The airbag 5 can help the force transmission plate 3 to uniformly transmit pressure and further uniformly apply force to the pressure plate 2 and the workpiece.

[0031] In one specific embodiment, the table 1 and the pressure plate 2 are made of aluminum alloy LC4 material.

[0032] In one specific embodiment, the airbag 5 is a vacuum airbag, and the rated load of the vacuum airbag is 3-5 kg / cm². 2 The preferred value is 4 kg / cm³. 2 )Continuously supply compressed air.

[0033] In one specific embodiment, the force transmission plate 3 is made of SUS304 and has a thickness of 1-5mm, preferably 3mm.

[0034] In this embodiment of the utility model, the end faces of the clamping plates on the left and right sides of the workpiece are kept parallel to the weld, and the spacing is strictly consistent (the spacing can be appropriately adjusted according to the specific situation of the workpiece, and the size is between 8-12mm).

[0035] In some possible embodiments, a first heat-conducting plate 21 is embedded in the workpiece contact surface of the pressure plate 2. In some possible embodiments, a second heat-conducting plate 11 is embedded in the workpiece contact surface of the platform 1. The second heat-conducting plate 11 has a groove in its center, which is aligned with the weld seam to constrain the weld pool and help the weld pool cool quickly. In a specific embodiment, the first and second heat-conducting plates are made of copper plates. In a specific embodiment, a 5mm thick copper plate is embedded in the surface of the pressure plate 2 that contacts the workpiece, and the copper plate is tightly fitted to the pressure plate 2 using countersunk screws. In a specific embodiment, a machined groove is provided at the center of the platform 1, into which a 60mm wide and 10mm thick copper plate is embedded. The groove is machined at the center of the upper surface of the copper plate, and the copper plate is tightly fitted to the platform 1 using countersunk screws.

[0036] In this embodiment of the invention, a heat-conducting plate made of copper is incorporated into the welding workpiece fixture. Copper and aluminum alloy have excellent thermal conductivity, enabling rapid heat transfer from the workpiece to the atmosphere during welding. Furthermore, the stable pressure of the air bladder ensures timely heat transfer, resulting in minimal or no workpiece deformation and stress. The welding workpiece fixture is also lightweight, allowing welding to be performed at the workstation, directly on equipment for plate splicing, or in other locations with sufficient height. This flexibility and mobility cater to different product parts and allows for welding over a wider range of applications. For example, replacement of parts can be performed directly on-site, facilitating maintenance and other tasks. Using countersunk screws to secure the copper plate ensures surface flatness and facilitates quick assembly and disassembly.

[0037] In some possible embodiments, the welding workpiece fixture further includes an end positioning bolt 6, one end of which is fastened to the longitudinal end of the moment-resisting square tube 4, and the other end of which is fastened to the platform 1. The end positioning bolt 6 can apply stress to the moment-resisting square tube 4 and the platform 1 to clamp the component between them, ensuring that the pressure plate 2 can reliably press against the workpiece.

[0038] In one specific embodiment, the welding workpiece fixture further includes an end positioning block 12 for fixing the fixture.

[0039] In some possible embodiments, the airbag 5 is centrally positioned relative to the bending moment square tube 4 along its length. By centrally positioning the airbag 5 relative to the bending moment square tube 4, it can be effectively ensured that the airbag 5 can evenly distribute the stress applied to it by the bending moment square tube 4.

[0040] In some possible embodiments, the length of the airbag 5 is 85%-95% of the length of the moment-resisting square tube 4. By setting the length of the airbag 5 in the above manner, on the one hand, the airbag 5 is not too long, which can save the material used for the airbag; on the other hand, the airbag 5 is not too short, which can ensure that it can evenly distribute the stress applied by the moment-resisting square tube 4.

[0041] In some possible embodiments, the length of the airbag 5 is greater than the maximum width of the workpiece. By setting the length of the airbag 5 in the above manner, it can be further ensured that the stress uniformly distributed by the airbag 5 can be uniformly transmitted to the workpiece, ensuring that the workpiece is uniformly pressed by the pressure plate 2.

[0042] In some possible embodiments, such as Figure 1 As shown, the welding workpiece fixture also includes a vertical stiffener plate 7, a lower end plate 8, a first welding workpiece 9, and a second welding workpiece 10, which are the two workpieces to be welded.

[0043] In some possible embodiments, the welding workpiece fixture further includes a frame that presses against the end of the moment-resisting square tube 4 away from the force-transmitting plate 3. For example... Figure 3 As shown, in some possible embodiments, the frame includes a bottom frame assembly 20 and an upper beam assembly 23. The upper beam assembly 23 is connected and fixed to the bottom frame assembly 20 by connecting bolts 22. In some possible embodiments, the welding workpiece fixture also includes positioning elements 24, which are disposed on the left and right sides of the upper end of the moment-resisting square tube 4 to prevent the upper plane of the moment-resisting square tube 4 from shifting from the lower plane of the frame when the vacuum bag 5 is in the inflated state.

[0044] In some possible embodiments, a 6mm thick PP (polypropylene) sheet is laid on the upper surface of the bottom frame assembly 20 to prevent surface wear and scratches during the welding and movement of longer workpieces. The bottom end of the PP sheet is where the bottom frame assembly 20 and the bending moment-resistant square tube 4 meet. During welding, workers can stand directly on the PP sheet to perform welding operations in a comfortable posture (to ensure welding quality, manual tungsten inert gas welding is used for steel strip splicing; different products can have different welding methods, such as handheld laser welding).

[0045] In the above manner, the welding workpiece fixture provided in this embodiment, when continuously supplied with compressed air to the airbag 5, the upper end face of the airbag 5 abuts against the lower plane of the moment-resistant square tube 4, and the lower plane of the airbag 5 abuts against the force transmission plate 3, thereby transmitting the force to the pressure plate 2, and then transmitting the pressure continuously and stably to the critical end of the weld seam of the workpiece to be welded through the pressure plate 2. The internal stress is applied by the end positioning bolts 6 and the frame, and all components of the system (platform 1, pressure plate 2, force transmission plate 3, moment-resistant square tube 4, etc.) are under force, and the workpiece clamping part is in a uniform stress state during welding.

[0046] This utility model embodiment also provides a welding device, which includes the welding workpiece clamps as described in any embodiment. This welding device is a butt welding device, comprising at least two welding workpiece clamps, each clamp holding a plate-shaped workpiece to complete the butt welding of two coplanar plate-shaped workpieces.

[0047] In a specific embodiment, the welding equipment provided by this utility model operates as follows: The thin sheet metal workpiece to be welded is placed on the second heat-conducting plate 11 of the platform 1 of the bottom frame assembly 20, with the weld seam aligned with the groove in the middle of the second heat-conducting plate 11. The upper beam assembly 23 is connected and fixed to the bottom frame assembly 20 via the end positioning block 12 and the end positioning bolt 6. Compressed air is continuously introduced into the vacuum bladder 5. The bladder 5 expands, and through the force transmission plate 3, a uniform and stable pressure is transmitted to the pressure plate 2 (and its embedded first heat-conducting plate 21), pressing it tightly against both sides of the workpiece weld seam. Then, welding (argon arc welding) is performed. The welding heat is transferred by the workpiece to the closely contacting copper plate (first heat-conducting plate 21, second heat-conducting plate 11) and aluminum alloy plate (platform 1, pressure plate 2, etc.), and is quickly dissipated. Under the constraint of the groove in the middle of the lower copper plate (second heat-conducting plate 11) and rapid cooling, the weld pool achieves good single-sided welding and double-sided forming. Welding completed. Gas supply stopped. Bolts removed. Upper beam assembly 23 removed. Workpiece taken out.

[0048] In summary, the welding equipment provided in this embodiment can successfully achieve high-quality butt welding along the length of ultra-wide (>1500mm) thin sheet metal. The welding equipment provided in this embodiment significantly reduces welding deformation and stress. Thanks to the efficient heat dissipation of the heat-conducting plate and the uniform compression of the airbag 5, welding efficiency is greatly improved. Rapid heat dissipation allows for continuous or rapid segmented welding, reducing waiting time for cooling. Single-sided welding with double-sided forming eliminates the need for flipping welding or back-side cleaning. The welding equipment provided in this embodiment improves weld quality, particularly solving the problem of poor back-side forming, achieving reliable single-sided welding with double-sided forming.

[0049] The welding equipment of this invention enhances the applicability of tooling. Its lightweight design allows for flexible use in various locations (ground, equipment, height), meeting diverse application scenarios (production, maintenance). Furthermore, the welding equipment of this invention protects the workpiece surface: the PP plate of the base frame effectively prevents wear and scratches during the movement of long workpieces.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A welding workpiece fixture, characterized by, include: tabletop; A pressure plate is disposed opposite to the table plate, and the pressure plate is used to press the workpiece between the pressure plate and the table plate; The force transmission plate includes a bottom plate and two side plates. The bottom plate abuts against the pressure plate, and the two side plates are positioned opposite each other on both sides of the bottom plate to form a U-shaped groove. A moment-resistant square tube, at least a portion of which enters the tank body; An airbag is located within the groove and fills the space between the force transmission plate and the moment-resisting square tube.

2. The welding workpiece fixture according to claim 1, characterized in that: The workpiece contact surface of the pressure plate is embedded with a first heat-conducting plate.

3. The welding workpiece clamp of claim 1, wherein, The workpiece contact surface of the platform is embedded with a second heat-conducting plate.

4. The welding workpiece clamp of claim 1, wherein, Also includes The end positioning bolt is fastened at one end to the end of the bending moment resisting square tube along its length, and at the other end to the platform.

5. The welded workpiece clamp of claim 1, wherein, Along the length of the moment-resisting square tube, the airbag is centrally positioned relative to the moment-resisting square tube.

6. The welding workpiece fixture according to claim 5, characterized in that, The length of the airbag is 85%-95% of the length of the bending moment-resistant square tube.

7. The welding workpiece fixture according to claim 5, characterized in that, The length of the airbag is greater than the maximum width of the workpiece.

8. The welding workpiece fixture according to claim 1, characterized in that, Also includes The frame is pressed against the end of the moment-resisting square tube that is furthest from the force-transmitting plate.

9. A welding device, characterized in that, Including the welding workpiece fixture as described in any one of claims 1-8.

10. The welding equipment according to claim 9, characterized in that, The welding equipment is a butt welding equipment, comprising at least two welding workpiece clamps, each of which holds a plate-shaped workpiece to complete the butt welding of two coplanar plate-shaped workpieces.

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