Control Structure and Method for Preventing Welding Deformation of Upward Curved Roof Beams

Abstract

The present invention discloses an anti-welding deformation control structure and method for an upward-tilting type roof beam. The roof beam includes a roof plate, and a tongue plate is welded to the front end of the roof plate. The structure includes clips for assembly. Before welding, the roof plate and the tongue plate are clamped by the clips, and the tongue plate has an anti-deformation structure with a direction opposite to and a magnitude similar to that of the welding deformation direction of the roof plate. Before welding, two long strip-shaped fixing plates are longitudinally fixed to the back surface of the roof plate, and shims are added between the roof plate and the fixing plates. The thickness of the shims is the deformation amount after welding of the roof plate. By adopting the anti-deformation and fixture fixing method, the weldment is pre-bent in the direction opposite to the welding deformation and the rigidity and restraint of the component are increased to achieve the purpose of controlling the welding deformation. The problem of welding deformation at the front end of the thin roof plate structure of the upward-tilting type roof beam is solved.

Description

Technical Field

[0001] The present invention relates to a welding technology for hydraulic supports in coal mines, and particularly to a control structure and method for preventing welding deformation of upwardly curved top beams. Background Art

[0002] In coal mine hydraulic support products, structural components account for 60%-70% of the total support. Among the structural components, the key process is welding, and the quality of the welding process directly affects the overall quality of the product. In welding production, controlling and eliminating welding deformation is one of the key points and difficulties. During welding, due to the highly concentrated welding heat source, the various parts of the welded part are unevenly heated, resulting in stress and deformation. If the stress exceeds the yield strength of the material, plastic deformation will occur, and after cooling, the structural component will show deformation and residual stress. If the deformation of the structural component after welding exceeds the allowable value of the accuracy requirement, corresponding deformation correction treatment is required. Therefore, it is very important to take necessary measures to prevent welding deformation before welding.

[0003] Prior Art One:

[0004] To control the welding deformation of structural components, the welds should generally be symmetric or close to the neutral axis of the structure during structural design to prevent bending deformation. On the premise of ensuring the structural strength, the cross-sectional size of the weld is reduced. During process signature and review, the possibility of segmented welding of the structure should be considered to reduce the shrinkage deformation during welding.

[0005] Disadvantages of Prior Art One:

[0006] The above solutions can reduce welding deformation to a certain extent. However, for upwardly curved top beams, due to their structure with a relatively low height at the front end of the main rib plate and a relatively thin roof plate, the deformation at the front end of the structural component after welding is more serious than that at the rear. Therefore, the above methods for preventing deformation cannot completely and effectively inhibit welding deformation.

[0007] Prior Art Two:

[0008] During production, in order to make up for the shortening of the size after welding, shrinkage allowances are often given priority in material preparation. During welding, reasonable assembly sequences, welding sequences, and welding process parameters are selected to control deformation.

[0009] Disadvantages of Prior Art Two:

[0010] The above solutions can reduce welding deformation to a certain extent. However, for upwardly curved top beams, due to their special structure, simply relying on the above methods to inhibit welding deformation has an insignificant effect. Summary of the Invention

[0011] The purpose of the present invention is to provide a control structure and method for preventing welding deformation of upwardly curved top beams.

[0012] The object of the present invention is achieved by the following technical solutions:

[0013] The upwardly warped type roof beam welding deformation prevention control structure of the present invention, the roof beam includes a roof plate, a tongue plate is welded to the front end of the roof plate, and includes a clip for assembly. Before welding, the roof plate and the tongue plate are clamped by the clip, and the tongue plate has an anti-deformation structure with a direction opposite to and a size similar to the welding deformation direction of the roof plate.

[0014] The method for implementing welding deformation control of the above upwardly warped type roof beam welding deformation prevention control structure includes:

[0015] According to the analysis of the structural characteristics of the roof beam component and the post-welding deformation situation, a pre-deformation with a direction opposite to and a size similar to the welding deformation direction is given to the tongue plate in advance, and the tongue plate is fixed by a clip during the first assembly of the roof beam component, so as to offset the deformation generated after the structural member is welded and prevent bending deformation and angular deformation;

[0016] For the structure with a relatively thin roof plate of the roof beam and a large upward warping amount, two long strip-shaped fixing plates are fixed at appropriate positions behind the roof plate. According to the upward warping size and the pre-judgment analysis of the welding deformation of the component, shims are added between the roof plate and the fixing plates to implement pre-deformation on the roof plate, and temporary tack welds are welded around the fixing plates to reduce the wave deformation generated after welding and increase the rigidity and restraint of the structure.

[0017] It can be seen from the technical solutions provided by the present invention above that the upwardly warped type roof beam welding deformation prevention control structure and method provided by the embodiments of the present invention achieve the purpose of controlling welding deformation by adopting the anti-deformation and fixture fixation method to bend the welded part in the direction opposite to the welding deformation in advance and increase the rigidity and restraint of the component. The problem of welding deformation at the front end of the thin roof plate structure of the upwardly warped type roof beam is solved. Brief Description of the Drawings

[0018] Figure 1a 、 Figure 1b 、 Figure 1c They are respectively schematic structural diagrams of the tongue plate in Embodiment 1 of the present invention, its assembly with the roof plate, and its being clamped by a clip.

[0019] Figure 2a 、 Figure 2b They are respectively schematic side and top view structural diagrams of Embodiment 2 of the present invention.

[0020] In the figure:

[0021] 1, roof plate; 2, tongue plate; 3, clip; 4, fixing plate; 5, shim. Detailed Description of the Embodiments

[0022] The embodiments of the present invention will be further described in detail below. The content not described in detail in the embodiments of the present invention belongs to the prior art well known to those skilled in the art.

[0023] For the control structure of preventing welding deformation of the upturned type roof beam of the present invention, its preferred specific implementation manner is as follows:

[0024] The roof beam includes a roof plate, and a tongue plate is welded to the front end of the roof plate. The tongue plate includes clips for assembly. Before welding, the roof plate and the tongue plate are clamped with the clips, and the tongue plate has an anti-deformation structure with a direction opposite to and a size similar to that of the welding deformation direction of the roof plate.

[0025] Before welding, two long strip-shaped fixing plates are longitudinally fixed on the back of the roof plate, and shims are added between the roof plate and the fixing plates. The thickness of the shims is the deformation amount after welding of the roof plate.

[0026] The method for implementing welding deformation control of the above-mentioned control structure for preventing welding deformation of the upturned type roof beam includes:

[0027] According to the analysis of the structural characteristics of the roof beam components and the post-welding deformation situation, an anti-deformation with a direction opposite to and a size similar to that of the welding deformation is pre-given to the tongue plate, and the tongue plate is fixed with clips during the primary assembly of the roof beam components to offset the deformation generated after welding of the structural members and prevent bending deformation and angular deformation;

[0028] For the structure with a relatively thin roof plate of the roof beam and a large upturn amount, two long strip-shaped fixing plates are fixed at appropriate positions on the back of the roof plate. According to the upturn size and the pre-judgment analysis of the welding deformation of the components, shims are added between the roof plate and the fixing plates to implement pre-deformation of the roof plate, and temporary tack welds are welded around the fixing plates to reduce the wave deformation generated after welding and increase the rigidity and restraint of the structure.

[0029] The control structure and method for preventing welding deformation of the upturned type roof beam of the present invention achieve the purpose of controlling welding deformation by adopting the anti-deformation and fixture fixing method to pre-bend the welded parts in the direction opposite to the welding deformation and increase the rigidity and restraint of the components. It solves the problem of welding deformation at the front end of the thin roof plate structure of the upturned type roof beam. Specific embodiments:

[0031] The anti-deformation method of the tongue plate is as shown in Figure 1a , Figure 1b , Figure 1c . According to the analysis of the structural characteristics of the roof beam components and the post-welding deformation situation, an anti-deformation with a direction opposite to and a size similar to that of the welding deformation is pre-given to the tongue plate, and the tongue plate is fixed with clips during the primary assembly of the roof beam components to offset the deformation generated after welding of the structural members and prevent bending deformation and angular deformation.

[0032] The fixture fixing method of the roof plate is as shown in Figure 2a , Figure 2bAs shown in the figure, for the structure with a relatively thin top beam roof and a large upward warping amount, two long strips are fixed at appropriate positions behind the roof. According to the upward warping size and the pre-judgment analysis of the welding deformation of the components, shims are added between the roof and the fixing plate to pre-deform the roof, and temporary tack welds are welded around the fixing plate, which can reduce the wave deformation generated after welding. This welding fixture can also be used to increase the rigidity and restraint of the structure.

[0033] The beneficial effects brought by the specific embodiment scheme;

[0034] According to the post-welding deformation of the structural member, an opposite and similar-sized deformation is pre-given to the roof of the welded part by using reverse deformation and the rigid fixing method of the roof in order to obtain the effect of suppressing welding deformation.

[0035] Through the pilot application in the hydraulic support products produced by China Coal Beijing Coal Mining Machinery Co., Ltd., the effect of controlling the welding deformation of the front part of the upward-warping top beam is remarkable. The components only need simple shaping after welding to meet the technical requirements of the design drawings and the assembly and use tolerance requirements.

[0036] As mentioned above, the above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A control structure for preventing welding deformation of an upward-tilting type roof beam, the roof beam including a roof plate, and a tongue plate being welded to the front end of the roof plate, characterized in that, It includes clips for assembly. Before welding, the top plate and the tongue plate are clamped by the clips, and the tongue plate is provided with an anti-deformation structure with a direction opposite to and a size similar to that of the welding deformation direction of the top plate; Before welding, two strip-shaped fixing plates are longitudinally fixed on the back of the top plate, and a backing bar is added between the top plate and the fixing plates, and the thickness of the backing bar is the deformation amount after the top plate is welded; The method for controlling welding deformation of this structure includes: According to the analysis of the structural characteristics of the roof beam component and the post-welding deformation situation, an anti-deformation with a direction opposite to and a size similar to that of the welding deformation direction is given to the tongue plate in advance, and the tongue plate is fixed with clips during the first assembly of the roof beam component to offset the deformation generated after the structural member is welded and prevent bending deformation and angular deformation; For the structure with a relatively thin top plate of the roof beam and a large upward warping amount, two strip-shaped fixing plates are fixed at appropriate positions behind the top plate. According to the upward warping size and the pre-judgment analysis of the welding deformation of the component, a backing bar is added between the top plate and the fixing plates to pre-deform the top plate, and temporary tack welds are welded around the fixing plates to reduce the wave deformation generated after welding and increase the rigidity and restraint of the structure.

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