Groove type bulkhead plate welding frame for bulk cargo ship

Abstract

The utility model discloses a groove type bulkhead plate welding frame for a bulk cargo ship, which comprises a bottom support and a groove type mould frame, a U-shaped groove which is completely consistent with the groove type of a groove type bulkhead plate is arranged on the groove type mould frame, and the groove type mould frame is used for placing a wall plate unit. A lower lug plate is arranged on the bottom support, correspondingly, an upper lug plate is welded to the bending and rounding position of the back face of each wall plate unit, and the upper lug plates and the lower lug plates are connected through a tensioning device so as to form oblique pulling force on the wall plate units, so that the wall plate units can be stably attached to the U-shaped grooves of the groove-shaped formwork. The manufacturing precision, the assembling and welding efficiency and the welding quality of the groove type bulkhead plate can be improved, and temporary fixing clamps do not need to be welded to the joints of the adjacent wall plate units; the stability of the welding frame is high, the welding frame does not need to be repeatedly repaired and cut frequently in the process of manufacturing the groove-shaped bulkhead plates in batches, and therefore the repeated utilization rate of the welding frame can be increased, and the quality stability of the groove-shaped bulkhead plates manufactured in batches can be improved.

Description

Technical Field

[0001] The utility model relates to the field of ship hull construction, in particular to a grooved bulkhead plate welding frame for bulk carriers. Background Art

[0002] There are a large number of corrugated bulkheads in the hull structure of bulk carriers. Corrugated bulkheads are made of straight steel plates that are bent and spliced. Corrugated bulkheads have the advantages of high rigidity, strong resistance to deformation, no need for other reinforcement structures, small cargo hold volume, and less risk of cargo residue. Therefore, corrugated bulkheads are widely used in bulk carriers. However, the wall panels of corrugated bulkheads require high manufacturing precision. For example, the width of the bottom and the notch, the flatness of the bottom, the inclination angle of the groove wall, the radius of the groove wall, the total width of the groove wall and other data are allowed to fluctuate within a small range. Otherwise, it is difficult for the completed wall panel unit to be butted and assembled and welded in the form of corner joints with the structure of the adjacent wall panel unit or other structures, and the rework process is difficult. The butt joints of adjacent wall panel units are prone to lateral angular deformation and lateral shrinkage deformation on both sides during the welding process, and construction quality problems that require rework after welding often occur.

[0003] In the prior art, the wall panel welding of the grooved bulkhead is to hoist the wall panel units that have completed cutting and groove processing (using a butt joint with a groove gap of 4 to 10 mm) one by one onto a prefabricated flat frame and temporarily weld and fix them to the flat frame, and then use a large number of temporary clamps (1 piece for 300 to 400 mm installation and welding) to temporarily rigidly fix the butt joints of the wall panel units. After assembly is completed, the FCAW method (flux-cored CO2 gas shielded welding) is used to perform multi-layer and multi-pass welding on the butt joints of the wall panel units. After welding is completed, gas flame cutting or carbon arc gouging is used to remove all temporarily fixed clamps. Finally, the scars left by the large number of temporary fixed clamps are repaired and polished to restore them to their original state as much as possible. For the prior art production process, see Figure 1 shown.

[0004] In the prior art, a large number of temporary fixed card codes need to be welded, and the installation time before welding and the removal time after welding are long. The temporary card codes cannot be reused many times, and the material and construction time costs of the temporary card codes are high. In addition, welding cannot be carried out continuously at the temporary card code position during the welding process. After the welding is interrupted, the card code must be bypassed and then the welding is continued, resulting in many weld joints, affecting the appearance and internal quality of the weld. The post-welding treatment of the temporary card code scars takes a lot of time, and it is difficult to completely restore them to their original state; a large number of temporary fixed card codes need to be installed and welded on the butt joints of adjacent wall panel units, and efficient automatic welding construction cannot be carried out, the welding efficiency is low, the welding labor intensity is high, and the welding quality is unstable; the root gap of the groove of the butt joint is large (otherwise it cannot be welded through), the cross-sectional area of ​​the butt joint is large, the required weld metal filling amount is large, the welding material consumption is large, and the welding time is long. The welding process is long, the construction cost is high, and the accumulated welding stress and welding deformation during the welding process are large; the flat frame lacks precise rigid constraints, and it is difficult to ensure the groove accuracy of the grooved bulkhead plate during assembly before welding. In addition, the welding process is prone to angular deformation of the welds on both sides or lateral shrinkage deformation of the welds. The flatness of the wall plate unit after welding is not easy to ensure, and the groove width of the grooved bulkhead plate and the total width of the grooved wall are not easy to ensure; the flat frame is used. In order to ensure the stability and safety requirements of the grooved wall, it is necessary to perform multiple temporary welding fixations between the wall plate unit and the flat frame. There are many construction processes, and after the wall plate unit is welded, the temporary welding and fixing area needs to be cut and removed, which destroys the original state of the frame surface, causes much damage to the flat frame, and cannot ensure the accuracy of the frame, affecting the subsequent production accuracy of the grooved wall, which is not conducive to the repeated use of the frame. Utility Model Content

[0005] In view of this, the technical problem to be solved by the utility model is to provide a grooved bulkhead plate welding frame for bulk carriers, which can achieve accurate and stable positioning and fixation of the wall plate unit, so as to complete the welding of the grooved bulkhead.

[0006] In order to solve the above technical problems, the utility model proposes a bulk carrier trough bulkhead welding frame, comprising a bottom bracket located on the ground and a trough formwork arranged on the bottom bracket, the trough formwork is used to place the wall panel units for welding into trough bulkhead panels, therefore, the trough formwork is provided with a plurality of U-shaped grooves which are completely consistent with the groove shape of the trough bulkhead panels, and the wall panel units are placed on the trough formwork to facilitate the welding of adjacent wall panel units;

[0007] Each wall panel unit needs to be fixed one by one on the slot formwork to ensure stability during welding. Therefore, a lower ear plate is provided on the bottom bracket, and correspondingly, an upper ear plate is welded at the bending position on the back of each wall panel unit. When the wall panel unit is placed on the slot formwork, the upper ear plate and the lower ear plate are connected by a tensioning device to form an oblique pulling force on the wall panel unit, so that the wall panel unit can be stably attached to the U-shaped groove of the slot formwork.

[0008] As a preferred solution of the utility model, the slot formwork comprises a first slot template and a second slot template, the U-shaped slot is continuously arranged on the first slot template and the second slot template, the first slot template and the second slot template have the same structural features, and the first slot template and the second slot template are parallel and vertically arranged on the bottom bracket. The structure of the first slot template and the second slot template makes the slot formwork structure simple and does not affect the welding of the wall panel unit.

[0009] As a preferred solution of the utility model, a third groove template is also arranged on the bottom bracket, and the third groove template has the same structural features as the first groove template or the second groove template, and the third groove template is arranged between the first groove template and the second groove template, and the third groove template is parallel to the first groove template and the second groove template and is arranged vertically.

[0010] As a preferred solution of the utility model, the bottom bracket includes a plurality of column feet, which are vertically fixed directly below the U-shaped groove of each groove template. In addition, it also includes a connecting cross bar, which is connected between the column feet below each groove template. The connecting cross bar can ensure the stability of the bottom bracket.

[0011] As a preferred solution of the utility model, the lower end of the column foot is also welded and fixed to the pre-buried steel structure on the ground to ensure that the bottom bracket is fixed on the ground, further ensuring the stability of the bottom bracket.

[0012] As a preferred solution of the utility model, a embedding groove is provided on the top of the column foot, and each groove-shaped template is correspondingly embedded in the embedding groove of the column foot and fixed by welding.

[0013] As a preferred solution of the utility model, the connecting cross bar includes an upper connecting cross bar and a lower connecting cross bar. The two layers of connecting cross bars can ensure the stability of the bottom bracket to meet the welding requirements of the grooved bulkhead.

[0014] As a preferred solution of the utility model, the lower ear plate is arranged on the lower connecting cross bar or the column foot.

[0015] As a preferred solution of the present invention, the tensioning device is a spring or a turnbuckle bolt.

[0016] As a preferred solution of the utility model, each groove template is provided with a clearance groove corresponding to the joint of adjacent wall panel units. Therefore, the clearance groove includes a bottom clearance groove arranged on the groove bottom of the U-shaped groove and a top clearance groove arranged on the groove top of the U-shaped groove.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] The utility model can fix the wall panel unit stably and reliably, can improve the manufacturing accuracy, welding efficiency and welding quality of the grooved bulkhead plate, and does not need to weld temporary fixing codes at the joints of adjacent wall panel units; the welding frame has high stability, and does not need to be frequently and repeatedly trimmed and cut during the batch manufacturing of the grooved bulkhead plates, so the reuse rate of the welding frame can be improved, thereby improving the quality stability of the batch manufactured grooved bulkhead plates. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of welding a grooved bulkhead plate to a tire frame in the prior art;

[0020] Figure 2 Schematic diagram of the structure of the wall panel unit

[0021] Figure 3 is a schematic diagram of the structure of the corrugated bulkhead plate;

[0022] Figure 4 It is a structural schematic diagram of a welding frame in a preferred embodiment of the utility model;

[0023] Figure 5 This is a schematic diagram of fixing the first wall panel unit on the welding frame in the preferred embodiment of the utility model;

[0024] Figure 6 It is a schematic diagram of fixing the second wall panel unit on the welding frame in the preferred embodiment of the utility model;

[0025] Figure 7 This is a state diagram after the welding frame is fully covered with wall panel units in the preferred embodiment of the utility model (the basket bolts are not shown).

[0026] In the figure: 1-bottom bracket, 101-lower ear plate, 11-column foot, 12-connecting cross bar, 121-upper connecting cross bar, 122-lower connecting cross bar, 2-groove formwork, 21-first groove template, 22-second groove template, 23-third groove template, 3-groove bulkhead plate; 31-wall panel unit, 311-upper ear plate, 32-U-shaped groove, 4-basket bolt, 5-allowance groove. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may be another intermediate component through which it is fixed. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be another intermediate component at the same time. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be another intermediate component at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0030] Preferred Embodiments

[0031] like Figure 2-7 This is a preferred embodiment of the utility model. In this embodiment, a grooved bulkhead plate welding frame for a bulk carrier is proposed, comprising a bottom bracket 1 located on the ground and a grooved formwork 2 arranged on the bottom bracket 1. The grooved formwork 2 is used to place the wall panel units 31 for welding into grooved bulkhead plates 3. Therefore, the grooved formwork 2 is provided with a plurality of U-shaped grooves 32 which are completely consistent with the grooves of the grooved bulkhead plates 3. The wall panel units 31 are placed on the grooved formwork 2 to facilitate the welding of adjacent wall panel units 31.

[0032] Each wall panel unit 31 needs to be fixed one by one on the slot mold frame 2 to ensure stability during welding. Therefore, a lower ear plate 101 is provided on the bottom bracket 1. Correspondingly, an upper ear plate 311 is welded at the bending position on the back of each wall panel unit 31. When the wall panel unit 31 is placed on the slot mold frame 2, the upper ear plate 311 and the lower ear plate 101 are connected by a tensioning device to form an oblique pulling force on the wall panel unit 31, so that the wall panel unit 31 is stably attached to the U-shaped groove 32 of the slot mold frame 2.

[0033] Specifically, the slot formwork 2 in this embodiment includes a first slot formwork 21, a second slot formwork 22 and a third slot formwork 23, and the U-shaped slot 32 is continuously arranged on the first slot formwork 21, the second slot formwork 22 and the third slot formwork 23. The three slot formworks have the same structural features, and they are arranged parallel and vertically on the bottom bracket 1. The combination of the first slot formwork 21, the second slot formwork 22 and the third slot formwork 23 makes the slot formwork 2 simple in structure without affecting the welding of the wall panel unit 31.

[0034] The structure of the bottom bracket 1 in this embodiment includes a plurality of column feet 11, which are vertically fixed directly below the U-shaped groove 32 of each groove template. In addition, it also includes a connecting cross bar 12, which is connected between the column feet 11 below each groove template. The connecting cross bar 12 can ensure the stability of the bottom bracket 1. In order to ensure that the bottom bracket 1 has sufficient stability, the connecting cross bar 12 includes an upper connecting cross bar 121 and a lower connecting cross bar 122. The two layers of connecting cross bars can ensure that the stability of the bottom bracket 1 meets the welding requirements of the grooved bulkhead plate 3. The lower end of the column foot 11 is also welded and fixed to the pre-buried steel structure on the ground to ensure that the bottom bracket 1 is fixed on the ground, further ensuring the stability of the bottom bracket 1.

[0035] For the connection between the column foot 11 and the groove template, the utility model adopts the following method: an embedding groove is provided on the top of the column foot 11, and each groove template is correspondingly embedded in the embedding groove of its own column foot 11 and fixed by welding.

[0036] In this embodiment, the lower ear plate 101 is specifically arranged on the lower connecting cross bar 122, and the tensioning device for fixing each wall panel unit 31 to the groove template adopts a basket bolt 4. The basket bolt 4 is retracted by a lead screw, and the tightness can be easily adjusted. Therefore, the fixing of the wall panel unit 31 on the groove template and the removal after welding are very simple.

[0037] In order to better weld the adjacent wall panel units 31, each groove template is provided with a clearance groove 5 at the joint corresponding to the adjacent wall panel units 31. Therefore, the clearance groove 5 in this embodiment includes a bottom clearance groove 51 provided on the bottom of the U-shaped groove 32 and a top clearance groove 52 provided on the top of the U-shaped groove 32. The clearance groove 5 can be passed through by the FGB gasket during the welding process.

[0038] The utility model does not limit the welding between adjacent wall panel units 31. This embodiment proposes a preferred solution, that is, after each wall panel unit 31 is fixed on the groove template with a basket bolt 4, the FCAW method (flux-cored CO2 gas shielded welding) is first used to intermittently weld and fix the joints of each adjacent wall panel unit 31. The length of each tack weld is 50 to 80 mm, the thickness of the tack weld is 4 to 6 mm, and the intermittent length of the tack weld is 300 to 500 mm. The diameter of the tack weld wire is 1.2 mm, the tack weld current is 220A ± 10%, the welding voltage is 28V ± 10%, and the CO2 gas flow rate is 20L / min. After tack welding, the welding slag covering the surface of the tack weld is thoroughly removed. The lower surface of the grooved bulkhead plate 3 that has been intermittently welded and fixed is in full contact with the upper surface of each groove template, forming a stable rigid limit constraint on the grooved bulkhead plate 3. During the welding process of the butt joints of adjacent wall panel units 31, there may be two welding deformation trends: transverse shrinkage deformation perpendicular to the length direction of the weld and angular deformation of the welds on both sides. In this embodiment, since the lower surface of the grooved bulkhead plate 3 is in full contact with the upper surface of each grooved template, a rigid limit constraint is formed, which can effectively prevent the possible transverse shrinkage deformation and angular deformation at the weld, and ensure that the accuracy of the grooved bulkhead plate after welding meets the technical requirements. After completing the positioning welding of the entire butt joint, the FGB gasket is installed on the back of the butt joint of the grooved bulkhead plate 3. The center of the FGB gasket is aligned with the center of the butt joint of the grooved bulkhead plate 3. The FGB gasket and the grooved bulkhead plate 3 and the joint between the FGB gasket and the FGB must be fully pressed and fitted to prevent the high-temperature liquid metal from dissolving and falling or even overflowing downward during the welding process, resulting in welding defects or interruptions in the welding process.

[0039] After completing the installation of the FGB gasket, evenly lay special welding iron powder at the root of the groove, with a thickness of 5 to 10 mm. Appropriately reduce the amount of iron powder laid in the area with positioning welds to ensure that the upper surface height of the iron powder is basically consistent after the iron powder is laid. Appropriately increase the amount of iron powder laid in the area with a larger gap at the root of the local joint of the grooved bulkhead plate 3 (to prevent welding through the area and ensure that the weld excess height in the area is basically consistent with the overall weld excess height). The purpose of laying welding iron powder: to prevent burn-through and improve welding deposition efficiency. The laying of the welding trolley rail is completed simultaneously during the iron powder laying stage, and the welding trolley rail maintains a certain parallel distance with the grooved wall plate.

[0040] After the iron powder is laid, the butt joint of the groove bulkhead plate 3 is welded by FGB method. Preparations are started for FGB method single-sided submerged arc automatic welding of the butt joint of the groove bulkhead plate 3. Adjust the end of the welding wire (Φ4.8mm submerged arc welding wire) and the infrared detection point to align with the center of the butt joint, then open the valve switch of the flux hopper, and the flux automatically flows down to cover the surface of the butt joint of the groove bulkhead plate 3. After setting the welding parameters (welding current 700-800A, welding voltage 29-31V, welding speed 20-36cm / min, welding wire dry extension 40-45mm), start the welding button to automatically complete the FGB method submerged arc automatic welding of the butt joint of the entire groove bulkhead plate 3, and single-sided welding and double-sided forming. In the FGB submerged arc automatic welding process, the weld of the assembly positioning weld is completely melted again to form a new welding pool, and the weld is formed after cooling and solidification. The front and back sides (surfaces) of the entire weld are formed uniformly. The welding current is large, the welding pool temperature is high, the welding material and the base material (groove area) are completely melted, the slag shell formed by the flux completely protects the welding pool, and the internal fusion quality of the weld is good.

[0041] After the welding of the butt joints of the entire groove bulkhead plate 3 is completed, the FGB gasket is removed and the FGB gasket residue on the surface of the groove bulkhead plate 3 is completely cleaned. After that, after the welding of all the butt joints of the same groove bulkhead plate 3 is completed, all the turnbuckle bolts 4 are loosened and removed, and the groove formwork 2 loses the rigid fixing constraint on the groove bulkhead plate 3 that has been welded and installed. A cutting torch or a carbon arc air gouging is used to remove all the upper ear plates 311 on the back of the groove bulkhead plate, and the scars left on the groove bulkhead plate 3 due to the removal of the upper ear plates 311 are repaired by welding and polishing to restore the original state, completing the final welding of the groove bulkhead plate 3. Finally, a crane is used to lift and remove the completed groove bulkhead plate 3 from the welding frame, and the welding of the next groove bulkhead plate 3 can be continued.

[0042] The above description of the embodiments is to facilitate the understanding and application of the present invention by those skilled in the art. It is obvious that those familiar with the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the embodiments herein, and improvements and modifications made to the present invention by those skilled in the art based on the disclosure of the present invention should be within the scope of protection of the present invention.

Claims

1. A corrugated bulkhead plate welding frame for bulk carriers, characterized in that: It comprises a bottom bracket and a grooved formwork arranged on the bottom bracket, wherein the grooved formwork is provided with a plurality of U-shaped grooves which are completely consistent with the grooves of the grooved bulkhead plates, and the grooved formwork is used to place the wall plate units to facilitate the welding of adjacent wall plate units; The bottom bracket is provided with a lower ear plate, and correspondingly, an upper ear plate is welded at the bending position on the back of each wall panel unit. When the wall panel unit is placed on the groove-type formwork, the upper ear plate and the lower ear plate are connected by a tensioning device to form an oblique pulling force on the wall panel unit, so that the wall panel unit can be stably attached to the U-shaped groove of the groove-type formwork.

2. A corrugated bulkhead plate welding frame for a bulk carrier as claimed in claim 1, characterized in that: The groove formwork frame includes a first groove template and a second groove template, the U-shaped groove is continuously arranged on the first groove template and the second groove template, the structural features of the first groove template and the second groove template are consistent, and the first groove template and the second groove template are parallel and vertically arranged on the bottom bracket.

3. A corrugated bulkhead plate welding frame for a bulk carrier as claimed in claim 2, characterized in that: A third groove template is also arranged on the bottom bracket. The third groove template has the same structural features as the first groove template or the second groove template. The third groove template is arranged between the first groove template and the second groove template. The third groove template is parallel to the first groove template and the second groove template and is arranged vertically.

4. A corrugated bulkhead plate welding frame for a bulk carrier as claimed in claim 2 or 3, characterized in that: The bottom bracket includes a plurality of column feet, which are vertically fixed directly below the U-shaped grooves of each groove template. In addition, the bottom bracket also includes a connecting cross bar, which is connected between the column feet below each groove template.

5. A corrugated bulkhead plate welding frame for a bulk carrier as claimed in claim 4, characterized in that: The lower end of the column foot is also welded and fixed to the pre-buried steel structure on the ground.

6. A corrugated bulkhead plate welding frame for a bulk carrier as claimed in claim 4, characterized in that: The top of the column foot is provided with an embedding groove, and each groove-shaped template is correspondingly embedded in the embedding groove of the column foot and fixed by welding.

7. A corrugated bulkhead plate welding frame for a bulk carrier as claimed in claim 4, characterized in that: The connecting crossbar comprises an upper connecting crossbar and a lower connecting crossbar.

8. A corrugated bulkhead plate welding frame for a bulk carrier as claimed in claim 7, characterized in that: The lower ear plate is arranged on the lower connecting cross bar or the column foot.

9. The corrugated bulkhead plate welding frame for bulk carriers according to claim 1, characterized in that: The tensioning device is a spring or a turnbuckle bolt.

10. A corrugated bulkhead plate welding frame for bulk carriers as claimed in claim 2 or 3, characterized in that: Each groove-shaped template is provided with a clearance groove corresponding to the joint of adjacent wall panel units.

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