Door frame welding fixture for preventing thermal distortion

Abstract

The utility model discloses a prevent door frame welding frock of thermal deformation, include: workstation, be provided with a plurality of first positioning hole on the surface, support plate, set up in the upper surface of workstation, be provided with a plurality of second positioning hole, clamp, including setting in the inside of the upper and lower two edges of support plate push -pull type clamp, positioning support, coaxial setting in support plate lies in the inside of door frame, positioning insert piece, including four positioning insert pieces, respectively insert to the clearance between four end portions of positioning support and door frame. The scheme carries out multiple positioning to door frame, can improve the positioning accuracy of door frame to ensure that the problem of not appearing thermal deformation in the welding process of door frame, for the repeated positioning of door frame of same size, need not adjust each positioning component again, can improve work efficiency.

Description

Technical Field

[0001] This utility model relates to the field of door frame welding fixtures, and in particular to a door frame welding fixture for preventing thermal deformation. Background Technology

[0002] After welding large door frames (especially those for air-raid shelters), the unsupported inner parts of the frame deform severely, causing misalignment of many holes during assembly with the door panel, making installation impossible. Therefore, traditional door frame welding requires repeated support and reshaping with jacks until the frame fits perfectly with the door panel, resulting in low efficiency and safety hazards.

[0003] To address the aforementioned issues, existing improvements involve installing positioning clamps on the welding platform to fix the door frame in place before welding, thus reducing the probability of thermal deformation during welding. For example, the utility model patent CN209175183U discloses a welding fixture for a civil defense door frame, including a welding platform with at least one positioning block spaced laterally at intervals to position the corresponding door frame to be welded. A clamping device is positioned between any two adjacent positioning blocks to press and fix the door frame. The door frame is positioned on the welding platform by the positioning blocks and then fixed and clamped by the corresponding clamping device before a bearing plate or steel strip is welded onto it. This ensures that the door frame does not deform or deforms only slightly during welding. However, this type of fixture requires clamping the door frame individually before each welding operation and releasing it after welding, making the positioning process complex. Furthermore, because the clamping device is fixed in position on the welding platform, this welding fixture cannot adapt to welding door frames of different sizes. Utility Model Content

[0004] Therefore, in order to solve the above problems, this utility model provides a door frame welding fixture to prevent thermal deformation.

[0005] This utility model is achieved through the following technical solution: A door frame welding fixture for preventing heat deformation, comprising: A workbench for placing a door frame, the surface of which is provided with a plurality of first positioning holes; A support plate is provided on the upper surface of the workbench and located inside the door frame. The support plate is provided with a plurality of second positioning holes, which are the same shape as the first positioning holes and are arranged vertically in correspondence. The clamp includes push-pull clamps disposed on the inner sides of the upper and lower sides of the support plate, the push-pull clamps being connected to the support plate, and each push-pull clamp including a push rod extending outward toward the supported plate and abutting against the door frame of the outer periphery of the support plate. A positioning bracket is coaxially disposed on the support plate and located inside the door frame. The positioning bracket is cross-shaped and includes four ends extending toward the door frame. The positioning inserts include four positioning inserts, which are respectively inserted into the gaps between the four ends of the positioning bracket and the door frame.

[0006] Preferably, the positioning bracket includes a first square tube and a second square tube arranged perpendicularly to each other. The first square tube is arranged perpendicularly between the upper and lower sides of the support plate, and the second square tube is arranged perpendicularly between the left and right sides of the support plate.

[0007] Preferably, the clamp includes four push-pull clamps, with two push-pull clamps on each of the upper and lower sides of the support plate, and the two push-pull clamps along the same side are symmetrically arranged on both sides of the first square tube.

[0008] Preferably, the push-pull clamp includes a positioning base, a handle, a movable connector, and a top rod. The positioning base is fixed to the support plate, the handle is hinged to the top of the positioning base, one end of the movable connector is hinged to the handle, and the other end of the movable connector is hinged to the end of the top rod.

[0009] Preferably, the free end of the push rod of the push-pull clamp is further connected to an adjusting bolt, and a threaded hole is provided coaxially inside the free end of the push rod, and the adjusting bolt is threadedly connected to the threaded hole.

[0010] Preferably, it also includes a plurality of spiral clamps for connecting the support plate and the worktable, each spiral clamp passing through a set of first positioning holes and second positioning holes arranged vertically.

[0011] Preferably, it includes four 360° spiral clamps, which pass through four second positioning holes located at the four corners of the support plate and four first positioning holes at its bottom.

[0012] Preferably, the height of the positioning insert is greater than the thickness of the door frame, and the thickness of the positioning insert is equal to the distance from which the top rod of the push-pull clamp extends to the outside of the support plate.

[0013] Preferably, the area of ​​the workbench is larger than the area of ​​the support plate, the first positioning holes on the workbench and the second positioning holes on the support plate are arranged in a matrix, and the distance between two adjacent first positioning holes is the same as the distance between two adjacent second positioning holes.

[0014] The beneficial effects of this utility model's technical solution are mainly reflected in: This invention employs a support plate, clamps, positioning brackets, and positioning inserts for multiple positioning of the door frame, which improves the positioning accuracy of the door frame and ensures that the door frame does not experience thermal deformation during welding. For repeated positioning of door frames of the same size, there is no need to readjust the positioning components, further improving work efficiency. At the same time, by setting several corresponding positioning holes on the worktable and support plate, it is easy to flexibly adjust the installation position of the support plate on the worktable. When welding door frames of different sizes, replacing the support plate with one of different sizes can adapt to the positioning of door frames of different sizes, thereby expanding the applicability of the tooling. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the door frame structure; Figure 2 This is a schematic diagram (top view) of the door frame on a door frame welding fixture to prevent heat deformation. Figure 3 yes Figure 2 Enlarged view of section A; Figure 4 This is a schematic diagram (front view) of the door frame on a door frame welding fixture to prevent heat deformation. Figure 5 This is a schematic diagram of the installation status of the support plate, clamp, and positioning bracket (at this time, the support plate only has a second positioning hole at the corner). Detailed Implementation

[0016] To make the objectives, advantages, and features of this utility model clearer and more detailed, the following non-limiting description of preferred embodiments will be illustrated and explained. These embodiments are merely typical examples of applying the technical solutions of this utility model; any technical solutions formed by equivalent substitutions or equivalent transformations fall within the scope of protection claimed by this utility model.

[0017] It should also be stated that, in the description of the solution, the terms "center", "upper", "lower", "left", "right", "front", "rear", "inner", "outer", etc., 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 description and simplification, 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 this utility model.

[0018] Furthermore, the terms "first" and "second" in this solution are used for descriptive purposes only and should not be construed as indicating or implying a ranking of importance, or implicitly specifying the number of technical features shown. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In this utility model, "multiple" means two or more, unless otherwise explicitly specified.

[0019] This utility model discloses a welding fixture for door frames to prevent thermal deformation, such as... Figures 2-5 As shown, it includes: Workbench 1 is used to place door frame 100 so that door frame 100 can be welded on workbench 1. The surface of workbench 1 is provided with a plurality of first positioning holes (not shown in the figure). A support plate 2 is disposed on the upper surface of the workbench 1 and located inside the door frame 100. The support plate 2 is provided with a plurality of second positioning holes 201. The second positioning holes 201 are the same shape as the first positioning holes and are arranged vertically and vertically to ensure that the first positioning holes match the first positioning holes on the workbench 1, thereby realizing the connection between the support plate 2 and the workbench 1. The shape and size of the support plate 2 can be adjusted according to the shape and size of the door frame 100 to be welded, which will not be elaborated here. The clamp includes push-pull clamps 3 disposed on the inner sides of the upper and lower sides of the support plate 2, wherein the upper and lower sides of the support plate 2 correspond to the upper frame 1001 and lower frame 1002 of the door frame 100. During the welding process, since the inner sides of the upper frame 1001 and lower frame 1002 of the door frame 100 (i.e., the side located inside the door frame 100) are unsupported, they are prone to inward deformation. The push-pull clamps 3 disposed on the inner sides of the upper and lower sides of the support plate 2 can provide positioning and support for the inner sides of the upper frame 1001 and lower frame 1002 of the door frame 100, thereby preventing deformation. The push-pull clamps 3 are connected to the support plate 2, and each push-pull clamp 3 includes a push rod 304. The push rod 304 extends outward toward the support plate 2 and abuts against the door frame 100 on the outer periphery of the support plate 2, thereby providing support for the inner side of the door frame 100. A positioning bracket is coaxially disposed on the support plate 2 and located inside the door frame 100. The positioning bracket is cross-shaped and includes four ends extending toward the door frame 100. Since the positioning bracket is cross-shaped, each end of the positioning bracket is disposed inside one side of the rectangular door frame 100. The positioning inserts 6 include four positioning inserts 6, which are respectively inserted into the gaps between the four ends of the positioning bracket and the door frame 100. First, the door frame 100 is placed around the support plate 2 in sequence according to its position. There are gaps between the four ends of the positioning bracket on the support plate 2 and the door frame 100. After the door frame 100 is assembled, the positioning inserts 6 are inserted into the gaps between the four ends of the positioning bracket and the door frame 100, so that the positioning inserts 6 abut against the inner side of the door frame 100. This provides support force to the inner side of the four sides of the door frame 100 when the door frame 100 is welded, thus preventing the door frame 100 from deforming.

[0020] like Figure 2 , Figure 5 As shown, in some embodiments, the positioning bracket includes a first square tube 4 and a second square tube 5 arranged perpendicularly to each other. The first square tube 4 is arranged vertically between the upper and lower sides of the support plate 2, and the second square tube 5 is arranged vertically between the left and right sides of the support plate 2 to support the left side frame 1003 and the right side frame 1004 of the door frame 100. The first square tube 4 and the second square tube 5 have the same cross-sectional dimensions, and the first square tube 4 and the second square tube 5 are preferably connected by welding. At the same time, the lengths of the first square tube 4 and the second square tube 5 can be adjusted according to the length and width dimensions of the door frame 100, which will not be elaborated here.

[0021] like Figure 2 , Figure 3 As shown, in some embodiments, the clamp includes four push-pull clamps 3. Two push-pull clamps 3 are provided on both the upper and lower sides of the support plate 2, and the two push-pull clamps 3 provided along the same side are symmetrically arranged on both sides of the first square tube 4 to ensure the stability of the positioning of the door frame 100 and the balance of the distribution of positioning points.

[0022] like Figure 3 As shown, in some embodiments, the push-pull clamp 3 includes a positioning base 301, a handle 302, a movable connector 303, and a top rod 304. The positioning base 301 is fixed on the support plate 2. The handle 302 is hinged to the top of the positioning base 301. One end of the movable connector 303 is hinged to the handle 302, and the other end of the movable connector 303 is hinged to the end of the top rod 304. When the handle 302 is rotated reciprocally, the rotational motion of the handle 302 is converted into the linear motion of the top rod 304 through the movable connector 303. A sleeve 305 can also be inserted through the end of the top rod 304 that is hinged to the movable connector 303. The sleeve 305 is connected to the positioning base 301, thereby ensuring that the top rod 304 can extend and translate along the axial direction of the sleeve 305.

[0023] like Figure 3 As shown, in a preferred embodiment, the free end of the push rod 304 of the push-pull clamp 3 is also connected to an adjusting bolt 306. The free end of the push rod 304 has a threaded hole coaxially arranged inside. The adjusting bolt 306 is threadedly connected to the threaded hole. The overall length of the push rod 304 can be adjusted by finely adjusting the adjusting bolt 306, thereby ensuring the positioning accuracy of the push rod 304 on the door frame 100. In other embodiments, the push-pull clamp 3 can also adopt other existing push-pull clamp products, such as the multi-point quick clamp disclosed in the utility model patent with authorization announcement number CN219444803U, which will not be described in detail here.

[0024] In some embodiments, a plurality of spiral clamps (not shown in the figure) for connecting the support plate 2 and the worktable 1 are also included. Each spiral clamp passes through a set of first positioning holes and second positioning holes 201 arranged vertically. The spiral clamps preferably include four 360° spiral clamps. The four 360° spiral clamps pass through four second positioning holes 201 located at the four corners of the support plate 2 and four first positioning holes at its bottom, thereby realizing the positioning and connection of the support plate 2 and the worktable 1. In other embodiments, the support plate 2 and the worktable 1 can also be connected by positioning components such as bolts or positioning pins, which will not be elaborated here.

[0025] In some embodiments, the height of the positioning insert 6 is greater than the thickness of the door frame 100, ensuring that after the positioning insert 6 is inserted into the gap between the four ends of the positioning bracket and the door frame 100, the top of the positioning insert 6 still protrudes outside the gap, thus facilitating the insertion and removal of the positioning insert 6. The thickness of the positioning insert 6 is equal to the distance from the top rod 304 of the push-pull clamp 3 to the outside of the support plate 2, thereby ensuring that the support points of the two positioning inserts 6 at both ends of the first square tube 4 and the top rod 304 of the push-pull clamp 3 on both sides are located on the same plane, realizing the three-point positioning of the positioning insert 6 and the top rod 304 on the upper frame 1001 or lower frame 1002 of the door frame 100.

[0026] In some embodiments, the area of ​​the workbench 1 is larger than the area of ​​the support plate 2, ensuring that the portion of the workbench 1 extending outside the support plate 2 can be used to support the door frame 100 to be welded. The first positioning holes on the workbench 1 and the second positioning holes 201 on the support plate 2 are arranged in a matrix, and the spacing between two adjacent first positioning holes is consistent with the spacing between two adjacent second positioning holes 201, thereby ensuring that the positions of the second positioning holes 201 on the support plate 2 correspond vertically to the positions of the first positioning holes on the workbench 1. Figure 5 As shown, in some other embodiments, the support plate 2 is provided with second positioning holes 201 only at its four corners, and the first positioning holes on the worktable 1 are arranged in a matrix. However, it is necessary to ensure that the distance between two adjacent second positioning holes 201 is an integer multiple of the distance between two adjacent first positioning holes, so as to ensure that the second positioning holes are set vertically and vertically corresponding to the first positioning holes.

[0027] This utility model has many other embodiments. All technical solutions formed by equivalent transformation or equivalent transformation fall within the protection scope of this utility model.

Claims

1. A door frame welding fixture to prevent heat deformation, characterized in that: include: A workbench for placing a door frame, the surface of which is provided with a plurality of first positioning holes; A support plate is provided on the upper surface of the workbench and located inside the door frame. The support plate is provided with a plurality of second positioning holes, which are the same shape as the first positioning holes and are arranged vertically in correspondence. The clamp includes push-pull clamps disposed on the inner sides of the upper and lower sides of the support plate, the push-pull clamps being connected to the support plate, and each push-pull clamp including a push rod extending outward toward the supported plate and abutting against the door frame of the outer periphery of the support plate. A positioning bracket is coaxially disposed on the support plate and located inside the door frame. The positioning bracket is cross-shaped and includes four ends extending toward the door frame. The positioning inserts include four positioning inserts, which are respectively inserted into the gaps between the four ends of the positioning bracket and the door frame.

2. The door frame welding fixture for preventing thermal deformation according to claim 1, characterized in that: The positioning bracket includes a first square tube and a second square tube arranged perpendicularly to each other. The first square tube is arranged perpendicularly between the upper and lower sides of the support plate, and the second square tube is arranged perpendicularly between the left and right sides of the support plate.

3. The door frame welding fixture for preventing thermal deformation according to claim 2, characterized in that: The clamp includes four push-pull clamps. Two push-pull clamps are provided on each of the upper and lower sides of the support plate, and the two push-pull clamps provided along the same side are symmetrically arranged on both sides of the first square tube.

4. The door frame welding fixture for preventing thermal deformation according to claim 3, characterized in that: The push-pull clamp includes a positioning base, a handle, a movable connector, and a top rod. The positioning base is fixed to the support plate. The handle is hinged to the top of the positioning base. One end of the movable connector is hinged to the handle, and the other end of the movable connector is hinged to the end of the top rod.

5. The door frame welding fixture for preventing thermal deformation according to claim 4, characterized in that: The free end of the push rod of the push-pull clamp is also connected to an adjusting bolt. The free end of the push rod has a threaded hole coaxially arranged inside, and the adjusting bolt is threadedly connected to the threaded hole.

6. The door frame welding fixture for preventing thermal deformation according to claim 1, characterized in that: It also includes a plurality of spiral clamps for connecting the support plate and the worktable, each spiral clamp passing through a set of first positioning holes and second positioning holes arranged vertically.

7. The door frame welding fixture for preventing heat deformation according to claim 6, characterized in that: It includes four 360° spiral clamps, which pass through four second positioning holes located at the four corners of the support plate and four first positioning holes at its bottom.

8. The door frame welding fixture for preventing thermal deformation according to claim 1, characterized in that: The height of the positioning insert is greater than the thickness of the door frame, and the thickness of the positioning insert is equal to the distance from which the top rod of the push-pull clamp extends to the outside of the support plate.

9. The door frame welding fixture for preventing thermal deformation according to claim 1, characterized in that: The area of ​​the workbench is larger than the area of ​​the support plate. The first positioning holes on the workbench and the second positioning holes on the support plate are arranged in a matrix, and the distance between two adjacent first positioning holes is the same as the distance between two adjacent second positioning holes.

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