Large structural part buggy ladle frame R corner cracking welding heating device and method

Abstract

The invention discloses a large structural part buggy ladle frame R corner cracking welding heating device and method.The large structural part buggy ladle frame R corner cracking welding heating device comprises a supporting frame and a heating pipeline, the heating pipeline comprises two first connecting pipes and a plurality of second connecting pipes, and the two ends of each second connecting pipe communicate with the two first connecting pipes correspondingly to form a planar frame type structure; the first connecting pipe comprises a first connecting section and a second connecting section, the first connecting section is parallel to the first structural surface, the second connecting section is parallel to the second structural surface, heating nozzles are arranged on the first connecting pipe and the second connecting pipe in the direction corresponding to a buggy ladle frame, and a flow control valve is arranged on the heating pipeline. The flow control valve is connected with an external conveying pipeline; the heating pipeline is supported and positioned through the supporting frame, so that the heating pipeline forms a planar frame structure matched with a to-be-heated surface of a buggy ladle frame, and temperature control on the periphery of the R-angle section is realized through uniform heating of the heating nozzles on the heating pipeline, so that local pre-welding preheating and post-welding heat treatment operation are realized.

Description

Technical Field

[0001] This invention relates to the field of large equipment repair technology, specifically to a welding heating device and method for cracking the radius (R) of a large structural component, a steel ladle car frame. Background Art

[0002] In converter and large structural component refining processes, ladle cars with large structural components are often used. Due to long-term load use, cracks may appear on the radius (R) of the ladle car, and these cracks will continue to expand over time, making the ladle car unable to operate normally for production.

[0003] Existing repair methods generally involve on-site crack welding. The ladle car material for the large structural component refining project is 16Mn. Although 16Mn low alloy steel has good weldability, in order to control stress and deformation in thick and rigid structures, local preheating before welding and post-weld heat treatment are necessary. Due to the large and irregular R-angle volume of the ladle car in the large structural component refining project, the existing heating devices cannot meet the actual on-site working conditions for local preheating before welding and temperature control of post-weld heat treatment, which easily leads to poor welding repair results.

[0004] In view of the above-mentioned defects, the inventors of this invention have finally obtained this invention after a long period of research and practice. Summary of the Invention

[0005] To address the aforementioned technical deficiencies, the present invention provides a welding heating device for cracked R-corner sections of large structural steel ladle car frames. The steel ladle car frame includes a first structural surface and a second structural surface, which are connected by an arc transition between the first structural surface and the second structural surface and the R-corner section to be repaired.

[0006] The heating device for welding cracks at the R-angle of the large structural component steel ladle car frame includes a support frame and a heating pipe. The heating pipe includes two first connecting pipes and several second connecting pipes. The two ends of the second connecting pipes are respectively connected to the two first connecting pipes to form a planar frame structure. The first connecting pipe includes a first connecting section and a second connecting section. The first connecting section is arranged parallel to the first structural surface, and the second connecting section is arranged parallel to the second structural surface. The first connecting section and the second connecting section have a rounded transition. Heating nozzles are arranged on the first connecting pipe and the second connecting pipe in the direction corresponding to the steel ladle car frame. A flow control valve is provided on the heating pipe, and the flow control valve is connected to an external conveying pipe.

[0007] Preferably, each of the second connecting pipes is arranged in parallel, and each of the second connecting pipes is evenly distributed in a straight line along the extension direction of the first connecting pipe. The heating nozzles on each of the second connecting pipes are evenly distributed in a straight line along the extension direction of each of the second connecting pipes, and the heating nozzles on each of the first connecting pipes are evenly distributed in a linear manner along the extension direction of each of the first connecting pipes.

[0008] Preferably, the flow control valve is located on the second connecting pipe at its lowest position.

[0009] Preferably, the first connecting pipe is fixedly connected to the support frame.

[0010] Preferably, the support frame includes a support rod and a connecting rod, the support rod is vertically arranged, the connecting rod is horizontally arranged, the support rod and the connecting rod are vertically fixedly connected, the bottom of the support rod is in contact with the support surface, and the connecting rod is connected to the first connecting pipe.

[0011] Preferably, the connecting rod includes a first connecting member and a second connecting member. The first connecting member is horizontally disposed at the top of the support rod, and the second connecting member is disposed below the first connecting rod. The first connecting member and the second connecting member are parallel to each other. The first connecting member is fixedly connected to the first connecting segment, and the end of the second connecting member is fixedly connected to the second connecting segment.

[0012] Preferably, the first connector and the first connecting segment are arranged in parallel.

[0013] Preferably, there are multiple second connectors, and each second connecting rod connected to the same second connecting segment is set at a different height.

[0014] Preferably, a heating method for welding large structural steel ladle car frames with R-angle cracks involves using the aforementioned heating device for welding large structural steel ladle car frames with R-angle cracks. First, the steel ladle car frame is horizontally fixed. Heating nozzles are evenly distributed and welded to the heating pipe. The side of the heating pipe with the heating nozzles faces the first and second structural surfaces, and a heating gap is established between the heating nozzles and the first and second structural surfaces. Based on the welding repair site of the steel ladle car frame, a support frame is fixedly installed. The first connecting member is fixedly connected to the first connecting section, and the end of the second connecting member is fixedly connected to the second connecting section, forming an integral heating device for welding large structural steel ladle car frames with R-angle cracks. The device is then adjusted and moved to the heating position. Finally, a gas flow control valve is installed on the heating pipe to control the heating gas flow rate before welding repair, during welding, and during welding heat treatment, thereby completing the heating operation.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention supports and positions the heating pipe through the support frame, so that the heating pipe forms a planar frame structure that is adapted to the surface to be heated of the steel ladle car frame. Through the uniform heating of the heating nozzle on the heating pipe, the temperature around the R-corner section is controlled, so as to realize local preheating before welding and post-weld heat treatment operations. Attached Figure Description

[0016] Figure 1 A three-dimensional schematic diagram of the welding heating device for cracking the R-angle of the large structural component steel ladle car frame during use;

[0017] Figure 2 This is a front view of the structure of the large structural component steel ladle car frame R-angle crack welding heating device in use;

[0018] Figure 3 A three-dimensional structural view of the welding heating device for cracking the radius corner of the large structural component steel ladle car frame;

[0019] Figure 4 This is a front view of the structure of the heating device for welding the R-angle crack of the large structural component steel ladle car frame.

[0020] The numbers in the diagram represent:

[0021] 1-Steel ladle car frame; 2-Support frame; 3-Heating pipe; 4-Heating nozzle; 5-Flow control valve; 11-First structural surface; 12-Second structural surface; 13-R-angle section; 21-Support rod; 22-Connecting rod; 31-First connecting pipe; 32-Second connecting pipe; 221-First connector; 222-Second connector; 311-First connecting section; 312-Second connecting section. DETAILED DESCRIPTION

[0022] The above-mentioned and other technical features and advantages of the present invention will be described in more detail below with reference to the accompanying drawings.

[0023] Example 1

[0024] The large structural component steel ladle car frame R-corner crack welding heating device of the present invention is used for steel ladle car frame 1. The steel ladle car frame 1 includes a first structural surface 11 and a second structural surface 12. The first structural surface 11 and the second structural surface 12 are transitioned by an arc-shaped R-corner segment 13, which is the easily cracked segment of the steel ladle car frame 1. When repairing welding cracks, the steel ladle car frame 1 is generally placed horizontally. At this time, the first structural surface 11 is set horizontally, and the second structural surface 12 is set downwardly in a direction away from the first structural surface 11.

[0025] like Figures 1 to 4 As shown, Figure 1A three-dimensional schematic diagram of the welding heating device for cracking the R-angle of the large structural component steel ladle car frame during use; Figure 2 This is a front view of the structure of the large structural component steel ladle car frame R-angle crack welding heating device in use; Figure 3 A three-dimensional structural view of the welding heating device for cracking the radius corner of the large structural component steel ladle car frame; Figure 4 This is a front view of the structure of the heating device for welding the R-angle crack of the large structural component steel ladle car frame.

[0026] The heating device for welding cracks at the R-angle of a large structural component steel ladle car frame according to the present invention includes a support frame 2 and a heating pipe 3. The heating pipe 3 includes two first connecting pipes 31 and several second connecting pipes 32. The two ends of the second connecting pipes 32 are respectively connected to the two first connecting pipes 31 to form a planar frame structure to uniformly heat the first structural surface 11 and the second structural surface 12. The first connecting pipe 31 includes a first connecting section 311 and a second connecting section 312. The first connecting section 311 is arranged parallel to the first structural surface 11, and the second connecting section 312 is arranged parallel to the second structural surface 12. The first connecting section 311 and the second connecting section 312 have a rounded transition. The first connecting pipe 31 and the second connecting pipe 32 are provided with heating nozzles 4 corresponding to the steel ladle car frame 1. The heating pipe 3 is provided with a flow control valve 5, which is connected to an external conveying pipe. Combustible gas is delivered into the heating pipe 3 through the external conveying channel and heated to the corresponding area through the heating nozzle 4, thereby enabling local preheating before welding and post-weld heat treatment of the steel ladle car frame 1.

[0027] The flow control valve 5 is used to adjust the gas flow rate entering the heating pipe 3 and to switch it on and off, so that local areas of the steel ladle car frame 1 can be heated or insulated based on the actual situation.

[0028] Preferably, each of the second connecting pipes 32 is arranged in parallel and is evenly distributed in a straight line along the extension direction of the first connecting pipe 31. The heating nozzles 4 on each of the second connecting pipes 32 are evenly distributed in a straight line along the extension direction of each of the second connecting pipes 32, and the heating nozzles 4 on each of the first connecting pipes 31 are evenly distributed in a straight line along the extension direction of each of the first connecting pipes 31, thereby ensuring uniform heating at each position of the heating pipe 3.

[0029] Generally, the flow control valve 5 is installed on the second connecting pipe 32 at the lowest position, which facilitates the operator to perform flow control operations.

[0030] Preferably, the first connecting pipe 31 is fixedly connected to the support frame 2 to achieve overall support and fixation of the heating pipe 3. By connecting the first connecting pipe 31 and the support frame 2, the overall shape and structure of the heating pipe 3 can be stabilized, while the welding area between the heating pipe 3 and the support frame 2 can be reduced, the deformation of the heating pipe 3 caused by welding with the support frame 2 can be reduced, and the shape of the heating pipe 3 and the area to be heated by the steel ladle car frame 1 can be more closely matched, avoiding local overheating.

[0031] Specifically, the support frame 2 includes a support rod 21 and a connecting rod 22. The support rod 21 is vertically arranged, and the connecting rod 22 is horizontally arranged. The support rod 21 and the connecting rod 22 are vertically fixedly connected. The bottom of the support rod 21 is in contact with the support surface, thereby achieving the supporting and fixing effect of the support rod 21 on the connecting rod 22. The connecting rod 22 is connected to the first connecting pipe 31.

[0032] The connecting rod 22 includes a first connecting member 221 and a second connecting member 222. The first connecting member 221 is horizontally disposed at the top of the support rod 21, and the second connecting member 222 is disposed below the first connecting rod 22. The first connecting member 221 and the second connecting member 222 are arranged parallel to each other. The first connecting member 221 is fixedly connected to the first connecting segment 311, and the end of the second connecting member 222 is fixedly connected to the second connecting segment 312, thereby achieving the supporting and fixing effect of the support frame 2 on the overall structure of the heating pipe 3.

[0033] Generally, the first connector 221 and the first connecting segment 311 are arranged in parallel, which facilitates the welding and fixing of the first connector 221 and the first connecting segment 311.

[0034] Multiple second connectors 222 are provided, and each second connecting rod 22 connected to the same second connecting segment 312 is set at a different height, thereby ensuring stable support for the inclined second connecting segment 312.

[0035] Specifically, both the first connecting pipe 31 and the second connecting pipe 32 are made of φ50mm seamless steel pipe. The first connecting pipe 31 is formed by bending the seamless steel pipe, and the heating pipe 3 is formed by welding the first connecting pipe 31 and the second connecting pipe 32.

[0036] Both the support rod 21 and the connecting rod 22 are made of φ80mm seamless steel pipe. The support frame 2 is formed by welding the support rod 21 and the connecting rod 22. By moving and adjusting the support frame 2, each heating nozzle 4 can be ensured to be in a better heating position.

[0037] The present invention supports and positions the heating pipe 3 through the support frame 2, so that the heating pipe 3 forms a planar frame structure that is adapted to the surface to be heated of the steel ladle car frame 1. Through the uniform heating of the heating nozzle 4 on the heating pipe 3, the temperature around the R-corner section 13 is controlled, so as to realize local preheating before welding and post-weld heat treatment operations.

[0038] Example 2

[0039] The heating method for welding the R-angle crack of the large structural component steel ladle car frame of the present invention firstly fixes the steel ladle car frame 1 horizontally, and then evenly distributes and welds the heating nozzles 4 onto the heating pipe 3. The side of the heating pipe 3 with the heating nozzles 4 faces the first structural surface 11 and the second structural surface 12, and a reasonable heating distance is set between the heating nozzles 4 and the first structural surface 11 and the second structural surface 12 to facilitate uniform heating of the body. Based on the welding repair site of the ladle car frame 1, the support frame 2 is fixedly installed. The first connecting piece 221 is fixedly connected to the first connecting section 311, and the end of the second connecting piece 222 is fixedly connected to the second connecting section 312, forming an integral large structural component ladle car frame R-angle crack welding heating device. This device can be adjusted and moved to a suitable heating position. Finally, the gas flow control valve 5 is installed on the heating pipe 3 to ensure that the heating gas flow rate can be controlled before and during the welding repair and welding heat treatment of the ladle car frame R-angle crack. The refined engineering ladle car, after welding repair using the large structural component ladle car frame R-angle crack welding heating device of the present invention, fully meets the design and installation requirements through on-site actual sample inspection and acceptance, and is put into use. After periodic operation inspection of the refined engineering ladle car, it achieves the desired mechanical performance.

[0040] The heating method for welding the R-angle crack of large structural steel ladle car frame described in this invention is not only safe and easy to operate, but also can steadily improve welding quality, has low investment costs, meets actual on-site needs, has high work efficiency, greatly reduces maintenance costs, and reduces long-term downtime losses, thus providing a guarantee for reasonable production.

[0041] The above description is merely a preferred embodiment of the present invention and is illustrative rather than restrictive. Those skilled in the art will understand that many changes, modifications, and even equivalents can be made within the spirit and scope defined by the claims of the present invention, all of which will fall within the protection scope of the present invention.

Claims

1. A heating device for welding cracks at the radius (R) of a large structural component, a steel ladle car frame, characterized in that... The steel ladle car frame includes a first structural surface and a second structural surface, which are connected by a rounded arc transition of the R-corner segment to be repaired; The heating device for welding cracks at the R-angle of the large structural component steel ladle car frame includes a support frame and a heating pipe. The heating pipe includes two first connecting pipes and several second connecting pipes. The two ends of the second connecting pipes are respectively connected to the two first connecting pipes to form a planar frame structure. The first connecting pipe includes a first connecting section and a second connecting section. The first connecting section is arranged parallel to the first structural surface, and the second connecting section is arranged parallel to the second structural surface. The first connecting section and the second connecting section have a rounded transition. Heating nozzles are arranged on the first connecting pipe and the second connecting pipe in the direction corresponding to the steel ladle car frame. A flow control valve is provided on the heating pipe, and the flow control valve is connected to an external conveying pipe.

2. The heating device for welding cracking of the R-angle of a large structural steel ladle car frame as described in claim 1, characterized in that, Each of the second connecting pipes is arranged in parallel, and each of the second connecting pipes is evenly distributed in a straight line along the extension direction of the first connecting pipe. The heating nozzles on each of the second connecting pipes are evenly distributed in a straight line along the extension direction of each of the second connecting pipes, and the heating nozzles on each of the first connecting pipes are evenly distributed in a linear manner along the extension direction of each of the first connecting pipes.

3. The heating device for welding cracking of the R-angle of a large structural steel ladle car frame as described in claim 2, characterized in that, The flow control valve is located on the second connecting pipe at its lowest position.

4. The heating device for welding cracking of the R-angle of a large structural steel ladle car frame as described in claim 2, characterized in that, The first connecting pipe is fixedly connected to the support frame.

5. The heating device for welding cracking of the R-angle of a large structural steel ladle car frame as described in claim 4, characterized in that, The support frame includes a support rod and a connecting rod. The support rod is vertically arranged, and the connecting rod is horizontally arranged. The support rod and the connecting rod are vertically fixedly connected. The bottom of the support rod is in contact with the support surface, and the connecting rod is connected to the first connecting pipe.

6. The heating device for welding cracking of the R-angle of a large structural steel ladle car frame as described in claim 5, characterized in that, The connecting rod includes a first connecting member and a second connecting member. The first connecting member is horizontally disposed at the top of the support rod, and the second connecting member is disposed below the first connecting rod. The first connecting member and the second connecting member are parallel to each other. The first connecting member is fixedly connected to the first connecting segment, and the end of the second connecting member is fixedly connected to the second connecting segment.

7. The heating device for welding cracking of the R-angle of a large structural steel ladle car frame as described in claim 6, characterized in that, The first connector and the first connecting segment are arranged in parallel.

8. The heating device for welding cracking of the R-angle of a large structural steel ladle car frame as described in claim 6, characterized in that, The second connector is provided in multiple parts, and each second connecting rod connected to the same second connecting segment is set at a different height.

9. A heating method for welding large structural components, such as steel ladle car frames, to prevent cracking at the radius (R-angle), characterized in that... Using the large structural component steel ladle car frame R-corner crack welding heating device as described in any one of claims 1-8, firstly, the steel ladle car frame is horizontally fixed, and the heating nozzles are evenly distributed and welded to the heating pipe. The side of the heating pipe with the heating nozzles faces the first structural surface and the second structural surface, and a heating gap is set between the heating nozzles and the first and second structural surfaces. According to the welding repair site of the steel ladle car frame, the support frame is fixedly installed, the first connecting member is fixedly connected to the first connecting section, and the end of the second connecting member is fixedly connected to the second connecting section to form the integral large structural component steel ladle car frame R-corner crack welding heating device. The device is then adjusted and moved to the heating position. Finally, the gas flow control valve is installed on the heating pipe to control the heating gas flow rate before welding repair, during welding, and during welding heat treatment, thereby completing the heating operation.

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