Simple welding device for end abrasion of oxygen lance water-cooling box and repairing method

Abstract

The oxygen lance water-cooling box comprises a hollow circular chassis connecting seat, the bottom of the circular chassis connecting seat is communicated with a cold water inlet pipe and a hot water outlet pipe, and the top of the circular chassis connecting seat is uniformly and vertically communicated with a plurality of red copper hollow protective plates at intervals along the circumference; the inner side of the top of each red copper hollow protective plate is connected and fixed through a protective plate connecting and fixing ring; the simple welding device comprises a hook-shaped base supporting structural part and a base fixing plate obliquely arranged at the top of the base supporting structural part. A cold water inlet pipe hole and a hot water outlet pipe hole corresponding to a cold water inlet pipe and a hot water outlet pipe of the oxygen lance water cooling box in position are formed in the base fixing plate. Wherein the oxygen lance water cooling box is fixed on the base fixing plate by respectively inserting a cold water inlet pipe and a hot water outlet pipe into a cold water inlet pipe hole and a hot water outlet pipe hole, and each red copper hollow protective plate is in a vertical state. The method can effectively solve the problem of welding repair of the worn end part of the existing oxygen lance water-cooling box.

Description

Technical Field

[0001] The invention belongs to the technical field of welding, and in particular relates to a simple welding device and a repairing method for the wear at the end of an oxygen lance water cooling box. Background Art

[0002] The oxygen lance of the steelmaking electric furnace is a key equipment in the process of electric furnace steelmaking. It is mainly used to blow oxygen into the molten pool to accelerate chemical reactions and improve smelting efficiency. In daily work, the oxygen lance of the electric furnace is installed in the copper body oxygen lance water cooling box for oxygen blowing, and the oxygen lance water cooling box is directly inserted into the furnace of the electric furnace. The structure of the oxygen lance water cooling box is as follows Figure 3 As shown, it includes a circular chassis connecting seat 2 with a hollow interior, a cold water inlet pipe 3 and a hot water outlet pipe 6 are connected at the bottom of the circular chassis connecting seat 2, and a plurality of copper hollow guard plates 4 are vertically connected and evenly spaced along the circumference at the top. The inner side of the top of each copper hollow guard plate 4 is connected and fixed by a guard plate connecting fixing ring 7, and the oxygen gun is arranged on the inner side of the circle surrounded by the copper hollow guard plates 4. When working, cooling water is delivered to each copper hollow guard plate 4 through the cold water inlet pipe 3 through the circular chassis connecting seat 2, and then discharged through the hot water outlet pipe 6. Since the oxygen lance water-cooling box is hollow and has circulating hot and cold water to continuously cool it down, but the end is solid, it often causes end wear, which is mainly manifested as follows: (1) High-temperature oxidation and thermal fatigue: During the smelting process, the oxygen lance needs to withstand extremely high temperatures, which will cause high-temperature oxidation and thermal fatigue of the water-cooling box material, thereby causing wear; (2) Material scouring: The high-speed material particles generated during the smelting process will scour the surface of the water-cooling box, causing its surface to gradually wear; (3) Cooling water quality: Impurities or poor water quality in the cooling water may corrode the water-cooling box, aggravating its wear; (4) Design and manufacturing defects: If the design of the water-cooling box is unreasonable or there are defects in the manufacturing process, it may also cause it to be more susceptible to wear during use; (5) Improper operation: For example, improper control of the oxygen lance position causes the oxygen lance to be too low, causing the water-cooling box to be directly exposed to the high-temperature molten pool, accelerating its wear; (6) Mechanical damage: During operation, the oxygen lance or other equipment collides with the water-cooling box, which may cause mechanical damage and further aggravate wear. If the end of the oxygen lance water cooling box is seriously worn, it will directly lead to water leakage in the hollow oxygen lance water cooling box, resulting in serious safety accidents and steelmaking quality. Therefore, the hollow oxygen lance water cooling box that is easy to wear needs to be replaced frequently. Existing problems: Since the oxygen lance water cooling box is a wearable part, if it is replaced continuously for a long time, not only a large amount of procurement costs will be wasted, but the new parts replaced many times will affect the precision installation with other original assemblies, and produce various substandard performance. Summary of the invention

[0003] In view of the technical problems existing in the background technology, the present invention provides a simple welding device and a repair method for the wear of the end of the water-cooling box of an oxygen lance, which effectively solves the problem of welding and repairing the wear of the end of the water-cooling box of an oxygen lance.

[0004] The technical solution of the present invention to solve the technical problem is as follows:

[0005] According to one aspect of the present invention, a simple welding device for the wear of the end of an oxygen lance water-cooling box is provided, wherein the oxygen lance water-cooling box comprises a circular chassis connecting seat with a hollow interior, a cold water inlet pipe and a hot water outlet pipe are connected to the bottom of the circular chassis connecting seat, and a plurality of hollow copper guard plates are vertically connected and evenly spaced along the circumference at the top, and the inner side of the top of each hollow copper guard plate is connected and fixed by a guard plate connecting and fixing ring; the simple welding device comprises a hook-shaped base supporting structure and a base fixing plate obliquely arranged on the top of the base supporting structure, and a cold water inlet pipe hole and a hot water outlet pipe hole corresponding to the positions of the cold water inlet pipe and the hot water outlet pipe of the oxygen lance water-cooling box are opened on the base fixing plate; wherein: the oxygen lance water-cooling box is fixed to the base fixing plate by inserting the cold water inlet pipe and the hot water outlet pipe into the cold water inlet pipe hole and the hot water outlet pipe hole respectively, and each of the hollow copper guard plates is in a vertical state.

[0006] Furthermore, upper and lower inclined plates with the same angles are arranged on the top of both sides of the base supporting structure, and bolt holes are respectively opened at the upper and lower ends of the base fixing plate corresponding to the upper and lower inclined plates and are detachably fixed by fixing bolts.

[0007] Furthermore, the base supporting structure is formed by cutting, processing and welding a 20 mm thick steel plate, and the base fixing plate is formed by cutting and machining a 50 mm thick steel plate.

[0008] Furthermore, the fixing bolts are machined from round bars with a diameter of 25 mm, and the upper inclined plate and the lower inclined plate are respectively cut from steel plates with a thickness of 20 mm.

[0009] According to another aspect of the present invention, a method for repairing the wear of an oxygen lance water-cooling box end is provided, which is performed by the simple welding device for the wear of an oxygen lance water-cooling box end described in the above technical solution, and the oxygen lance water-cooling box is respectively inserted into the cold water inlet pipe hole and the hot water outlet pipe hole through the cold water inlet pipe and the hot water outlet pipe and fixed to the base fixing plate, so that each of the hollow copper guard plates is in a vertical state, and the repair method is as follows:

[0010] S1. Preparation before welding:

[0011] 1.1) Welding equipment: manual carbon dioxide gas shielded welding machine; welding materials: HS201 welding wire, φ1.2mm;

[0012] 1.2) Groove size: Prepare a U-shaped groove with a pad at the worn position;

[0013] 1.3) Heating equipment: oxygen and acetylene;

[0014] 1.4) Welding material: copper T1;

[0015] 1.5) Welding position: flat surfacing;

[0016] 1.6) Auxiliary facilities: template, magnifying glass, mask, gloves, slag hammer, hammer, chisel, file, wire brush, sandpaper, steel ruler, level, adjustable wrench, straight grinder, angle grinder, wire cutters, hacksaw blade, labor protection supplies;

[0017] 1.7) Requirements before welding: There should be no oil, oxide layer or moisture on the welding groove and welding wire surface;

[0018] 1.8) Welding technical requirements: The weld cladding layer fuses the parent material, the weld has no welding defects and meets the design dimensions;

[0019] 1.9) Welding process parameters: Welding parameters are formulated according to welding equipment, welding materials and welding requirements;

[0020] S2, welding implementation;

[0021] Use an angle grinder to clean the top of all the hollow copper guard plates to expose the metallic luster on the surface, and then perform surfacing welding one by one; when welding the end of the first hollow copper guard plate, use oxygen and acetylene for preheating to control its surface temperature in the range of 650~750℃, and then perform carbon dioxide gas protection bottom layer welding, use the straight wire feeding method, and implement multi-pass welding. After the bottom layer welding is completed, hammer the weld to eliminate stress, use visual inspection or a 10x magnifying glass to confirm that there are no welding defects, and then perform filling layer surfacing welding; measure the interlayer temperature before welding the filling layer to ensure the temperature is The temperature should not be lower than the preheating temperature range. The thickness of each weld of the filling layer should be controlled at about 10mm. After each layer of welding is completed, the weld should be hammered to eliminate stress, and then visual inspection or a 10x magnifying glass should be used to confirm that there are no defects. The interlayer temperature, hammering and surface welds of each layer of weld should be controlled. When welding the cover layer, the weld should be higher than the original parent material size. After the weld cools to room temperature, flaw detection should be carried out, and then manual grinding should be carried out. The ends of other hollow copper guard plates should be welded and repaired in the above manner, and they can be put into use after passing the final inspection.

[0022] Furthermore, the welding equipment is a Panasonic YD-350FR2 manual carbon dioxide gas shielded welding machine.

[0023] Furthermore, when welding the base layer, the welding current is 180-220A, the arc voltage is 25±1V, and the welding speed is 25±1cm·min-1; when welding the filling layer and the cover layer, the welding current is 240-260A, the arc voltage is 26±1V, and the welding speed is 25±1cm·min-1.

[0024] Furthermore, when oxygen·acetylene is used for preheating, a temperature gun is used to measure to ensure that the temperature must penetrate the surface layer thickness of 50mm.

[0025] Compared with the prior art, the present invention discloses a simple welding device and a repair method for the worn end of an oxygen lance water-cooling box. The simple welding device is not only safe and easy to operate, but also has a low investment cost, meets the actual needs on site, has high work efficiency, and greatly reduces the maintenance cost. It provides convenience for repairing the end of the oxygen lance water-cooling box, and effectively ensures the orderly progress of production. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the structure of the simple welding device of the present invention when in use;

[0027] Figure 2 It is a structural schematic diagram of the simple welding device of the present invention;

[0028] Figure 3 It is a structural schematic diagram of the water cooling box of the oxygen lance in the present invention;

[0029] In the figure: 1. base fixing plate; 2. circular chassis connecting seat; 3. cold water inlet pipe; 4. hollow copper guard plate; 5. base supporting structure; 51. upper inclined plate; 52. lower inclined plate; 53. cold water inlet pipe hole; 54. hot water outlet pipe hole; 55. fixing bolt; 6. hot water outlet pipe; 7. guard plate connecting fixing ring. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention. Unless otherwise defined, the technical terms or scientific terms used herein should be the usual meanings understood by people with general skills in the field to which the present disclosure belongs. "Up", "down", "left", "right", "front", "back" and the like used in the patent application specification and claims of the present disclosure are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship also changes accordingly; "connected" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The parts not described in detail in the present invention are all known technologies of technicians in the field of this technology.

[0031] Embodiment 1:

[0032] like Figure 1-3As shown, the oxygen gun water cooling box includes a circular chassis connecting seat 2 with a hollow interior, a cold water inlet pipe 3 and a hot water outlet pipe 6 are connected at the bottom of the circular chassis connecting seat 2, and a plurality of copper hollow guard plates 4 are evenly spaced and vertically connected at the top along the circumference, and the inner side of the top of each copper hollow guard plate 4 is connected and fixed by a guard plate connecting fixing ring 7. The oxygen gun water cooling box end wear simple welding device provided by the present invention includes a hook-shaped base support structure 5 and a base fixing plate 1 obliquely arranged on the top of the base support structure 5, and the base fixing plate 1 is provided with a cold water inlet pipe hole 53 and a hot water outlet pipe hole 54 corresponding to the position of the cold water inlet pipe 3 and the hot water outlet pipe 6 of the oxygen gun water cooling box. When used, the oxygen gun water cooling box can be fixed on the base fixing plate 1 by inserting the cold water inlet pipe 3 and the hot water outlet pipe 6 into the cold water inlet pipe hole 53 and the hot water outlet pipe hole 54 respectively, and each copper hollow guard plate 4 is in a vertical state. In this embodiment, the inclination angle of the line connecting the two ends of the hook-shaped base supporting structure 5 is determined according to the angle between the cold water inlet pipe 3 and the hot water outlet pipe 6 on the oxygen lance water cooling box and the circular chassis connecting seat 2, that is, after the oxygen lance water cooling box is placed on the base fixing plate 1, each copper hollow guard plate 4 is in a vertical state.

[0033] To facilitate the installation of the base fixing plate 1 on the base supporting structure 5, as a preferred embodiment, the top of both sides of the base supporting structure 5 are respectively inclined with an upper inclined plate 51 and a lower inclined plate 52 with the same angle, and the upper and lower ends of the base fixing plate 1 are respectively provided with bolt holes corresponding to the upper inclined plate 51 and the lower inclined plate 52 and are removably fixed by fixing bolts 55.

[0034] As a preferred embodiment, the base supporting structure 5 is formed by cutting, processing and welding of 20 mm thick steel plates, the base fixing plate 1 is formed by cutting and machining of 50 mm thick steel plates, the fixing bolts 55 are formed by machining of 25 mm diameter round bars, and the upper inclined plate 51 and the lower inclined plate 52 are formed by cutting and machining of 20 mm thick steel plates respectively.

[0035] Embodiment 2:

[0036] The present invention provides a method for repairing the wear of the end of an oxygen lance water-cooling box. The method is performed by using a simple welding device for the wear of the end of an oxygen lance water-cooling box in Example 1. The oxygen lance water-cooling box is inserted into the cold water inlet pipe hole 53 and the hot water outlet pipe hole 54 through the cold water inlet pipe 3 and the hot water outlet pipe 6, respectively, and fixed on the base fixing plate 1, so that each hollow copper guard plate 4 is in a vertical state. The repair method is as follows:

[0037] S1. Preparation before welding:

[0038] 1.1. Welding equipment: Panasonic YD-350FR2 manual carbon dioxide gas shielded welding machine; welding materials: HS201 welding wire, φ1.2mm;

[0039] 1.2. Groove size: Prepare a U-shaped groove with a pad at the worn position;

[0040] 1.3. Heating equipment: oxygen and acetylene;

[0041] 1.4. Welding material: copper T1;

[0042] 1.5. Welding position: flat surfacing;

[0043] 1.6. Auxiliary facilities: sample, magnifying glass, mask, gloves, slag hammer, hammer, chisel, file, wire brush, sandpaper, steel ruler, level, adjustable wrench, straight grinder, angle grinder, wire cutters, hacksaw blade, labor protection supplies;

[0044] 1.7. Requirements before welding: There should be no oil, oxide layer or moisture on the welding groove and welding wire surface. Use acetone and sandpaper to remove rust, grease and moisture on the welding groove and welding wire surface.

[0045] 1.8. Welding technical requirements: The weld cladding layer is fused with the base material, the weld has no welding defects and meets the design dimensions;

[0046] 1.9. Welding process parameters: Welding parameters shall be formulated according to welding equipment, welding materials and welding requirements;

[0047] Welding process parameters

[0048] Welding wire model Solder layer Wire diameter / mm Welding current A Arc voltage / v Welding speed / (cm`min-1) HS201 Base 1.2 180-220 25±1 25±1 HS201 Filling cover layer 1.2 240-260 26±1 25±1

[0049] S2. Welding implementation:

[0050] Welding process route: wear surface is placed in flat welding position - use angle grinder to clean the surface to expose metallic luster - oxygen acetylene preheating 650~750℃ - carbon dioxide gas protection bottom layer cladding - detect surface defects - maintain interlayer temperature - filler layer cladding - flat hammer hammer weld - detect defects layer by layer - cover layer cladding higher than the original base material - slow cooling - processing - testing - delivery for use.

[0051] Use an angle grinder to clean the top of all the hollow copper guard plates 4 to expose the metallic luster on their surfaces, and then perform surfacing welding one by one; when welding the end of the first hollow copper guard plate 4, use oxygen and acetylene for preheating to control its surface temperature in the range of 650~750℃. This temperature must penetrate the surface layer thickness of 50mm and be measured with a qualified temperature measuring gun. Then, perform the bottom layer welding with carbon dioxide gas protection. The weld should not be too wide. Use a straight wire feeding method and perform multi-pass welding. In this way, the high-temperature copper liquid is not easy to absorb harmful gases and is more fused to the parent material. After the bottom layer welding is completed, hammer the weld to eliminate stress, and then use visual inspection or a 10x magnifying glass to confirm that there is no After the welding defects are found, the filling layer is surfacing welded; before the filling layer is welded, a temperature gun is used to measure the interlayer temperature to ensure that the temperature is not lower than the preheating temperature range. The thickness of each layer of the filling layer weld is controlled at about 10mm. After each layer of welding is completed, the weld is hammered to eliminate stress, and then visual inspection or a 10x magnifying glass is used to confirm that there are no defects. The interlayer temperature, hammering of the weld and detection of the surface weld are required for each layer of weld; when welding the cover layer, the weld is higher than the original size of the parent material. After the weld cools to room temperature, a flaw detection is carried out, and then it is manually ground; then the welding repair of the ends of the other copper hollow guard plates 4 is carried out in the above manner, and after passing the final inspection, it is put into use.

Claims

1. A simple welding device for the end wear of an oxygen lance water cooling box, the oxygen lance water cooling box comprising a circular chassis connecting seat (2) with a hollow interior, a cold water inlet pipe (3) and a hot water outlet pipe (6) being connected at the bottom of the circular chassis connecting seat (2), and a plurality of hollow copper guard plates (4) being connected vertically and evenly spaced along the circumference at the top, the inner sides of the tops of the hollow copper guard plates (4) being connected and fixed by guard plate connection fixing rings (7), characterized in that: The simple welding device comprises a hook-shaped base support structure (5) and a base fixing plate (1) obliquely arranged on the top of the base support structure (5), the base fixing plate (1) being provided with a cold water inlet pipe hole (53) and a hot water outlet pipe hole (54) corresponding to the positions of the cold water inlet pipe (3) and the hot water outlet pipe (6) of the oxygen lance water cooling box; wherein: the oxygen lance water cooling box is fixed to the base fixing plate (1) by inserting the cold water inlet pipe (3) and the hot water outlet pipe (6) into the cold water inlet pipe hole (53) and the hot water outlet pipe hole (54) respectively, and making each of the copper hollow guard plates (4) in a vertical state.

2. A simple welding device for the wear of the end of the water-cooling box of an oxygen lance according to claim 1, characterized in that: An upper inclined plate (51) and a lower inclined plate (52) are respectively arranged at the top of both sides of the base support structure (5) at the same angle, and bolt holes are respectively provided at the upper and lower ends of the base fixing plate (1) corresponding to the upper inclined plate (51) and the lower inclined plate (52) and are detachably fixed by fixing bolts (55).

3. A simple welding device for the wear of the end of the water-cooling box of an oxygen lance according to claim 1, characterized in that: The base support structure (5) is formed by cutting, processing and welding a 20 mm thick steel plate, and the base fixing plate (1) is formed by cutting and machining a 50 mm thick steel plate.

4. A simple welding device for the wear of the end of the water-cooling box of an oxygen lance according to claim 2 or 3, characterized in that: The fixing bolt (55) is machined from a round bar with a diameter of 25 mm, and the upper inclined plate (51) and the lower inclined plate (52) are respectively cut from a steel plate with a thickness of 20 mm.

5. A method for repairing wear on the end of an oxygen lance water cooling box, characterized in that: The oxygen lance water cooling box end wear simple welding device as claimed in any one of claims 1 to 4 is used to fix the oxygen lance water cooling box on the base fixing plate (1) by inserting the cold water inlet pipe (3) and the hot water outlet pipe (6) into the cold water inlet pipe hole (53) and the hot water outlet pipe hole (54) respectively, so that each of the copper hollow guard plates (4) is in a vertical state. The repair method is as follows: S1. Preparation before welding: 1.1) Welding equipment: manual carbon dioxide gas shielded welding machine; welding materials: HS201 welding wire, φ1.2mm; 1.2) Groove size: Prepare a U-shaped groove with a pad at the worn position; 1.3) Heating equipment: oxygen and acetylene; 1.4) Welding material: copper T1; 1.5) Welding position: flat surfacing; 1.6) Auxiliary facilities: template, magnifying glass, mask, gloves, slag hammer, hammer, chisel, file, wire brush, sandpaper, steel ruler, level, adjustable wrench, straight grinder, angle grinder, wire cutters, hacksaw blade, labor protection supplies; 1.7) Requirements before welding: There should be no oil, oxide layer or moisture on the welding groove and welding wire surface; 1.8) Welding technical requirements: The weld cladding layer fuses the parent material, the weld has no welding defects and meets the design dimensions; 1.9) Welding process parameters: Welding parameters are formulated according to welding equipment, welding materials and welding requirements; S2, welding implementation; Use an angle grinder to clean the tops of all the hollow copper guard plates (4) to expose their metallic luster, and then perform surfacing welding one by one; When welding the end of the first copper hollow guard plate (4), oxygen·acetylene is used for preheating so that its surface temperature is controlled in the range of 650~750℃, and then the bottom layer welding is carried out under carbon dioxide gas protection, and the straight wire feeding method is used to implement multi-pass welding. After the bottom layer welding is completed, the weld is hammered to eliminate stress. After visual inspection or a 10x magnifying glass is used to confirm that there are no welding defects, the filling layer is welded. Before the filling layer is welded, the interlayer temperature is measured to ensure that the temperature is not lower than the preheating temperature range. The thickness of each weld of the filling layer is controlled to be about 10mm. After each layer is welded, the weld is hammered to eliminate stress. Then, visual inspection or a 10x magnifying glass is used to confirm that there are no defects. The interlayer temperature, hammering weld and surface weld of each weld need to be controlled. When welding the cover layer, the weld is higher than the original parent material size. After the weld cools to room temperature, a flaw detection is carried out, and then manual grinding is carried out. The ends of other copper hollow guard plates (4) are welded and repaired in the above manner, and after passing the final inspection, they are put into use.

6. The repair process according to claim 5, characterized in that: The welding equipment is a Panasonic YD-350FR2 manual carbon dioxide gas shielded welding machine.

7. The repair process according to claim 5, characterized in that: When welding the base layer, the welding current is 180-220A, the arc voltage is 25±1V, and the welding speed is 25±1 cm·min -1 When welding the filling layer and the cover layer, the welding current is 240-260A, the arc voltage is 26±1V, and the welding speed is 25±1 cm·min -1 .

8. The repair process according to claim 5, characterized in that: When using oxygen and acetylene for preheating, use a temperature gun to measure and ensure that the temperature must penetrate the surface layer thickness of 50mm.

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