Submerged arc automatic welding machine for inner circular seam of boiler

Abstract

The invention discloses a boiler inner circular seam submerged arc automatic welding machine, and relates to the technical field of welding, the boiler inner circular seam submerged arc automatic welding machine comprises a wire feeding assembly, a welding wire is arranged in the wire feeding assembly, a supporting frame is arranged at the lower end of the wire feeding assembly, and a hopper and an air suction pipe are arranged on the two sides of the supporting frame respectively; the lower end of the hopper is provided with a welding flux discharging mechanism used for stacking welding flux and changing gaps among welding flux particles. The vibration ring and the vibration piece are arranged to adjust the gaps between welding flux particles, the gaps between the welding flux particles can be adjusted through small-amplitude vibration transmitted to the vibration piece in the welding flux, the moderate porosity is formed, the proper gaps allow gas (such as moisture decomposition gas) generated in the welding process to be smoothly discharged, the air hole defect is reduced, and the welding quality is improved. The optimized particle gaps are beneficial to uniform transfer of heat to the welding flux and the surface of a workpiece, the welding flux particles are prevented from being adhered to one another due to static electricity or humidity through vibration, the loose state of the welding flux particles is ensured, and subsequent recovery and reutilization are facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of welding, and particularly relates to an automatic submerged arc welding machine for the inner circumferential seam of a boiler. Background Art

[0002] For example, the publication number is CN110773849B, and the patent name is a gantry type tower pipe seam welding machine. Among them, the solution provided by the invention has a compact structure, can adjust the position of the seam pressure application point on both sides of the tower pipe and the direction of the acting force according to the change of the cross-sectional shape of the tower pipe, and can coarsely and finely adjust the mechanism position in time according to the change of the straightness of the seam gap, so as to realize the automatic correction of the position of the submerged arc welding head.

[0003] In the submerged arc welding of the inner circumferential seam of a boiler, when the flux is unevenly distributed, it is easy to cause defects in the molten pool flow such as slag inclusions, lack of fusion and impurity mixing, which will increase the risk of pores. When the flux accumulates, the poor shape of the flux accumulation will cause problems such as oxidation, nitridation pollution and inconsistent forming of the weld edge. And when there is moisture and oxide layer on the surface of the welding wire, it is easy to produce hydrogen-induced cracks and unstable arcs. Therefore, the present application provides an automatic submerged arc welding machine for the inner circumferential seam of a boiler to meet the requirements. Summary of the Invention

[0004] The purpose of the present application is to provide an automatic submerged arc welding machine for the inner circumferential seam of a boiler, which can effectively solve the problems raised in the above background art.

[0005] To achieve the above purpose, the present application provides the following technical solution: An automatic submerged arc welding machine for the inner circumferential seam of a boiler, including a wire feeding assembly. A welding wire is arranged inside the wire feeding assembly. A support frame is arranged at the lower end of the wire feeding assembly. A hopper and an air suction pipe are respectively arranged on both sides of the support frame. A flux feeding mechanism for accumulating flux and changing the gap between flux particles is arranged at the lower end of the hopper. A wire treatment mechanism for improving the arc starting performance of the welding wire is arranged in the middle of the support frame. A molten pool control mechanism for improving the arc stability is arranged on one side of the wire treatment mechanism. The molten pool control mechanism is located between the flux feeding mechanism and the wire treatment mechanism. A flux collecting mechanism for cleaning the flux and cooling the weld seam is arranged at the lower end of the air suction pipe.

[0006] Among them, the wire treatment mechanism includes a heating shell. The heating shell is installed in the middle of the lower end of the support frame. A heating coil is arranged inside the heating shell. An air hood is arranged at the lower end of the heating shell. A wire barrel is arranged in the middle of the air hood. A welding gun head is arranged inside the wire barrel. The welding wire passes through the heating coil and the wire barrel and extends into the inside of the welding gun head.

[0007] Among them, an air supply pipe is connected to the outer surface of the air hood. A ring hood is arranged on the outer surface of the air hood, and the ring hood is communicated with the inside of the air hood.

[0008] Among them, the molten pool control mechanism includes a gas guide shell, the gas guide shell is installed on the outer surface of the ring cover and communicates with the inside of the ring cover, a conduit is arranged at the bottom of the gas guide shell, a material shell is installed at the bottom of the conduit, and a push rib is arranged on one side of the material shell.

[0009] Among them, the inner wall of the material shell is connected with a material stacking and shaping shell through a partition block, a baffle is installed on the inner wall of the push rib, a plurality of strip-shaped holes are formed in the inner wall of the material stacking and shaping shell, and a guide piece is installed between the material stacking and shaping shell and the material shell through the partition block.

[0010] Among them, both the material stacking and shaping shell and the material shell are in a shape conforming to "Ω".

[0011] Among them, the flux feeding mechanism includes a discharging pipe, the discharging pipe is installed at the lower end of the hopper, a vibration ring is arranged on the outer surface of the discharging pipe, a vibration piece penetrating into the flux is arranged inside the vibration ring, a discharging nozzle is arranged at the lower end of the discharging pipe, and the cross section of the discharging nozzle is in a streamlined water droplet shape.

[0012] Among them, the flux feeding mechanism further includes two guiding pieces, installation blocks are arranged on the opposite surfaces of the two guiding pieces, and the two guiding pieces are respectively installed on both sides of the discharging nozzle through the installation blocks for shaping the flux.

[0013] Among them, the flux collecting mechanism includes a suction pipe, the suction pipe is installed at the lower end of the suction pipe, a suction nozzle is arranged at the lower end of the suction pipe, a bronchus is communicated with the outer surface of the suction pipe, and an elastic bracket for supporting the bronchus is arranged between the suction pipe and the bronchus; A cover shell is arranged at the lower end of the bronchus, installation strips are arranged on both sides of the cover shell, and skirt edges are sleeved on the outer surfaces of the two installation strips.

[0014] Among them, a boiler frame is arranged inside the wire feeding assembly, and a wire reel for winding the welding wire is arranged on one side of the wire feeding assembly.

[0015] In summary, the technical effects and advantages of the present invention: 1. In the present invention, the streamlined water-drop-shaped discharge nozzle can guide the flux to flow out at a stable flow rate, avoiding excessive or insufficient accumulation of the flux caused by uneven discharging. The special design of the front section of the discharge nozzle (such as a sharp or beveled structure) can scrape off the oxide scale, dust or other impurities on the weld surface, reducing inclusion defects (such as slag inclusions or lack of fusion) in the weld. Moreover, the vibration ring and vibration plate are provided to adjust the gap between flux particles. By transmitting small-amplitude vibrations to the vibration plate inside the flux, the gap between flux particles can be adjusted to form a moderate porosity. The appropriate gap allows the gases generated during the welding process (such as moisture decomposition gases) to be discharged smoothly, reducing porosity defects. The optimized particle gap helps to evenly transfer heat to the flux and the workpiece surface. Vibration prevents the flux particles from adhering to each other due to static electricity or humidity, ensuring their loose state, which is convenient for subsequent recycling and reuse.

[0016] 2. In the present invention, the Ω-shaped design of the stockpiling and shaping shell and the material shell guides the flux to accumulate into a trapezoidal cross-section, ensuring that a thicker protective layer is formed on both sides of the weld, reducing the risk of the edge area being exposed to air, and decreasing the probability of oxidation and nitridation defects. The inclined structure of the trapezoidal cross-section can guide the molten pool metal to flow along a predetermined path, avoiding overflow or uneven accumulation of the molten metal, and improving the consistency of the weld formation. The flux enters the shaping shell as the boiler welding part rotates, ensuring that the flux is always in the best accumulation form during the dynamic welding process. The baffle guides the gas to blow onto the surface of the flux, forming a continuous inert gas layer to isolate oxygen and nitrogen in the air. Moreover, the strip-shaped holes on the surface of the stockpiling and shaping shell accelerate the entry of the gas into the gap between flux particles, ensuring that the internal pores of the flux are also filled with the inert gas to further isolate the air. Additionally, the gas introduced through the wire handling mechanism has a preheating temperature (from the wire cooling process), which preheats the flux particles and reduces the moisture content on their surfaces. Preheating reduces the adsorption of hydrogen in the flux, avoiding the formation of pores or cracks caused by hydrogen generated from the decomposition of moisture at high temperatures.

[0017] 3. In the present invention, the heating coil heats the welding wire to evaporate the moisture adsorbed on its surface, avoiding the decomposition of moisture to generate hydrogen at high temperatures, thereby reducing the formation of pores and hydrogen-induced cracks and cleaning the surface. The heating process can remove the oil stain, oxide layer or other impurities on the surface of the welding wire, ensuring a pure contact between the welding wire and the molten pool, reducing slag inclusion or lack of fusion defects. After preheating, the surface temperature of the welding wire rises, reducing the difficulty of arc ignition and the risk of arc drift or extinction during starting, ensuring the continuity and stability of the welding process. Moreover, the preheated welding wire penetrates into the flux processed by the molten pool control mechanism, ensuring that the arc burns under a stable protective layer, reducing oxidation and nitridation caused by the intrusion of external air. The temperature matching between the welding wire and the flux can optimize the heat input distribution in the molten pool, reducing local overheating or uneven cooling, and improving the consistency of the weld formation. Brief Description of the Drawings

[0018] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 It is a first - perspective three - dimensional structure schematic diagram of the submerged arc automatic welding machine for the inner circumferential seam of the boiler; Figure 2 It is a second - perspective three - dimensional structure schematic diagram of the submerged arc automatic welding machine for the inner circumferential seam of the boiler; Figure 3 It is a third - perspective three - dimensional structure schematic diagram of the submerged arc automatic welding machine for the inner circumferential seam of the boiler; Figure 4 It is a partial first - perspective three - dimensional connection structure schematic diagram of the submerged arc automatic welding machine for the inner circumferential seam of the boiler; Figure 5 It is a partial second - perspective three - dimensional connection structure schematic diagram of the submerged arc automatic welding machine for the inner circumferential seam of the boiler; Figure 6 It is a three - dimensional connection structure schematic diagram of the wire - handling mechanism and the molten pool control mechanism; Figure 7 It is a sectional view of the three - dimensional connection structure of the wire - handling mechanism; Figure 8 It is a three - dimensional connection structure schematic diagram of the molten pool control mechanism; Figure 9 It is a partial three - dimensional connection structure schematic diagram of the molten pool control mechanism; Figure 10 It is a three - dimensional connection structure schematic diagram of the stacking and shaping shell and the material shell; Figure 11 It is a three - dimensional connection structure schematic diagram of the stacking and shaping shell; Figure 12 It is a three - dimensional connection structure schematic diagram of the flux feeding mechanism; Figure 13 It is a three - dimensional connection structure schematic diagram of the discharge nozzle and the discharge pipe; Figure 14 It is a three - dimensional connection structure schematic diagram of the guide plate and the discharge pipe; Figure 15 It is a first - perspective three - dimensional connection structure schematic diagram of the flux collection mechanism; Figure 16 It is a second - perspective three - dimensional connection structure schematic diagram of the flux collection mechanism.

[0020] In the figure: 1. Boiler frame; 2. Wire spool; 3. Wire feeding assembly; 5. Flux feeding mechanism; 51. Discharge pipe; 52. Vibration ring; 53. Vibration piece; 54. Guide piece; 55. Discharge nozzle; 56. Installation block; 6. Molten pool control mechanism; 61. Air guide shell; 62. Conduit; 63. Material shell; 64. Pushing rib; 65. Baffle; 66. Stockpiling and shaping shell; 67. Strip-shaped hole; 68. Guide piece; 7. Wire processing mechanism; 71. Air hood; 72. Welding torch head; 73. Air supply pipe; 74. Heating shell; 75. Bobbin; 76. Heating coil; 77. Ring hood; 8. Flux collection mechanism; 81. Suction pipe; 82. Suction nozzle; 83. Branch pipe; 84. Elastic bracket; 85. Cover shell; 86. Skirt; 87. Installation strip; 9. Suction air pipe; 10. Hopper; 11. Support frame; 12. Welding wire. Specific implementation mode

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0022] Embodiment 1. Refer to Figures 1 to 16 An internal ring seam submerged arc automatic welding machine for boilers shown in the figure, including a wire feeding assembly 3, a welding wire 12 is arranged inside the wire feeding assembly 3, a support frame 11 is arranged at the lower end of the wire feeding assembly 3, a hopper 10 and a suction air pipe 9 are respectively arranged on both sides of the support frame 11, a flux feeding mechanism 5 for stacking flux and changing the gap between flux particles is arranged at the lower end of the hopper 10, a wire processing mechanism 7 for improving the arc starting performance of the welding wire 12 is arranged in the middle of the support frame 11, a molten pool control mechanism 6 for improving the arc stability is arranged on one side of the wire processing mechanism 7, the molten pool control mechanism 6 is located between the flux feeding mechanism 5 and the wire processing mechanism 7, and a flux collection mechanism 8 for cleaning the flux and cooling the weld seam is arranged at the lower end of the suction air pipe 9.

[0023] A boiler frame 1 is arranged inside the wire feeding assembly 3, and a wire spool 2 for winding the welding wire 12 is arranged on one side of the wire feeding assembly 3.

[0024] It is worth noting that when in use, the boiler welding part is placed under the boiler frame 1. When welding the boiler, the flux feeding mechanism 5 stacks the flux inside the hopper 10 on the boiler welding part, and the transmission device arranged at the bottom of the boiler welding part drives the boiler welding part to rotate. The flux feeding mechanism 5 leaks the material inside the hopper 10 and stacks it at the weld, and the flux feeding mechanism 5 also preliminarily shapes the stacked flux and changes the gap between flux particles by slightly vibrating. Among them, the flux feeding mechanism 5 controls the release amount and distribution of the flux to ensure that the flux evenly covers the welding area, avoids local excessive thickness or thinness, can form a stable arc environment, and reduce the uneven melting depth or arc drift caused by uneven flux.

[0025] Moreover, the initial shaping of the flux feeding mechanism 5 ensures that the flux accumulation shape meets the welding requirements, provides a stable combustion space for the arc, and reduces the risk of arc drift or extinction. Among them, the gap between the flux particles is adjusted by small vibrations to form an appropriate porosity, which helps the gas generated during the welding process (such as hydrogen and water decomposition gas) to be discharged smoothly and reduce the generation of pore defects. The flux accumulation shape after shaping can cover the molten pool area more tightly, reduce air intrusion, reduce the risk of oxidation and nitride contamination, and improve the purity of the weld.

[0026] In addition, the gap between flux particles is adjusted so that heat is evenly transferred to the flux and the workpiece surface, promoting the metallurgical reaction between the flux and the molten metal (such as deoxidation and desulfurization), thereby improving the chemical composition and mechanical properties of the weld. Vibration can prevent flux particles from sticking to each other due to static electricity or humidity, ensuring their loose state for subsequent recycling and reuse. By controlling the flux accumulation shape, optimizing the particle gap and uniform coverage, welding defects such as porosity, slag inclusions and incomplete fusion can be significantly reduced, thereby improving the mechanical properties and corrosion resistance of the weld.

[0027] When the flux feeding mechanism 5 has completed stacking the flux, the molten pool control mechanism 6 gathers the flux so that the cross-section of the flux is stacked in a trapezoidal shape, and the molten pool control mechanism 6 fills the interior of the flux with inert gas while gathering the welding, and the filled gas passes through the welding wire processing mechanism 7 and cools the welding wire processing mechanism 7 so that the gas filled in the gaps between the flux particles has a temperature, thereby being able to preheat the flux.

[0028] Among them, shaping the flux cross section into a trapezoidal shape can guide the molten pool metal to flow along a predetermined path during welding, avoiding overflow or uneven accumulation of molten metal. The inclined structure of the trapezoid helps to evenly distribute the molten pool, especially in circumferential welding, which can form a more stable penetration and weld formation. The trapezoidal cross section ensures that the flux forms a thicker protective layer on both sides of the weld, reducing the risk of the edge area being exposed to the air, thereby reducing the probability of oxidation and nitridation defects.

[0029] Filling inert gas (such as argon or helium) into the flux further isolates the air, preventing the molten metal from reacting with oxygen and nitrogen, reducing the formation of oxides and nitrides, and improving the purity and mechanical properties of the weld. Moreover, the heat carried by the inert gas preheats the flux, reducing the moisture content in the flux (especially in humid environments), reducing the risk of hydrogen-induced cracking. At the same time, the combination of the preheated flux and the high-temperature arc can accelerate metallurgical reactions (such as deoxidation and desulfurization), optimizing the chemical composition of the weld metal.

[0030] And when the welding wire 12 passes through the welding wire treatment mechanism 7, the moisture adsorbed on its surface is evaporated by the welding wire treatment mechanism 7, avoiding the decomposition of moisture at high temperatures to produce hydrogen, thereby reducing the formation of pores and hydrogen-induced cracks. The preheated flux combines with the surface-treated welding wire, making it easier to ignite and stably burn the arc. The drying treatment of the welding wire surface reduces the risk of drift or extinction during arc starting.

[0031] The heat carried by the inert gas not only preheats the flux but also optimizes the heat input distribution in the molten pool, making the heat transfer to the workpiece and the flux more uniform, reducing defects caused by local overheating or uneven cooling. The filling and preheating of the inert gas work together to promote the rapid discharge of gases (such as moisture decomposition gases) generated during the welding process, reducing the formation of pores.

[0032] When the molten pool control mechanism 6 plastically processes the flux again, the welding wire treatment mechanism 7 drives the welding wire 12 to penetrate into the flux and contact the boiler welding part. The set wire feeding assembly 3 continuously pushes the welding wire 12 into the welding wire treatment mechanism 7. The welding wire 12 pushed by the wire feeding assembly 3 runs synchronously with the conveying device at the bottom of the boiler welding part. When the welding wire 12 passes through the welding wire treatment mechanism 7, the welding wire treatment mechanism 7 conducts preliminary heat treatment on the welding wire 12, increasing the temperature of the welding wire 12 to evaporate the moisture on its surface, making the arc starting of the welding wire 12 more stable in the flux, and combining with the flux processed by the molten pool control mechanism 6 to form a more stable molten pool.

[0033] Among them, the welding wire treatment mechanism 7 conducts preliminary heat treatment on the welding wire 12, evaporating the moisture adsorbed on its surface (such as hydrogen), avoiding the decomposition of moisture at high temperatures to produce pores or cause hydrogen-induced cracks. The surface temperature of the preheated welding wire 12 increases, reducing the difficulty of arc ignition and reducing problems such as arc drift or extinction caused by humidity or low temperature, ensuring the continuity and stability of the welding process. The preheated welding wire 12 combines with the pretreated flux, accelerating the metallurgical reactions (such as deoxidation and alloying) between the two, improving the purity and mechanical properties of the weld metal.

[0034] The molten pool control mechanism 6 reshapes the flux again (such as a trapezoidal cross-section), guides the uniform distribution of the molten pool metal, avoids the overflow or uneven accumulation of the molten metal, and can form a more stable penetration depth and weld formation. It is especially suitable for welding complex structures (such as boiler circumferential seams). The reshaped flux accumulation form ensures the uniform coverage of the protective layer around the molten pool, reduces oxidation and nitridation caused by air intrusion, and improves the purity of the weld.

[0035] After the welding of the boiler welded parts using the flux is completed, the flux collection mechanism 8 collects the flux after passing through the wire treatment mechanism 7 by suction, and the flux collection mechanism 8 also cools the weld during the collection of the flux.

[0036] Among them, the flux collection mechanism 8 can evenly take away the heat of the weld, avoid the concentration of thermal stress caused by local overheating or different cooling rates, reduce the risk of welding deformation and cracks. The slow and uniform cooling process helps to release the residual stress accumulated during the welding process. During the cooling process, the air flow can remove the oxide layer or residual flux on the weld surface, and the air flow during the cooling process can assist in discharging the oxides on the weld surface, reducing the inclusion defects caused by oxidation.

[0037] Embodiment 2: Based on the flux feeding mechanism 5 proposed in Embodiment 1, this embodiment provides a further technical solution for the flux feeding mechanism 5.

[0038] The flux feeding mechanism 5 includes a discharge pipe 51, the discharge pipe 51 is installed at the lower end of the hopper 10, a vibration ring 52 is arranged on the outer surface of the discharge pipe 51, a vibration piece 53 extending into the flux is arranged inside the vibration ring 52, a discharge nozzle 55 is arranged at the lower end of the discharge pipe 51, and the cross-section of the discharge nozzle 55 is in a streamlined water droplet shape.

[0039] The flux feeding mechanism 5 further includes two guiding pieces 54, mounting blocks 56 are arranged on the opposite surfaces of the two guiding pieces 54, and the two guiding pieces 54 are respectively installed on both sides of the discharge nozzle 55 through the mounting blocks 56 for shaping the flux.

[0040] It should be noted that when the flux is accumulated, the flux falls into the inside of the discharge pipe 51 through the hopper 10, and the flux falls into the inside of the discharge nozzle 55 through the discharge pipe 51. The discharge nozzle 55 is in a streamlined water droplet shape, so that the front section of the discharge nozzle 55 can clean the sundries in the weld, and then the flux leaks through the discharge nozzle 55 and accumulates at the weld of the boiler parts. The set discharge nozzle 55 is in Figure 12 and Figure 13In the shown shape, after the flux flows out from the discharging nozzle 55, the provided guiding sheet 54 preliminarily shapes the flux plastically, making the shapes of the accumulated flux lines consistent. The vibration ring 52 transmits the force to the vibrating sheet 53 through the internal vibration motor, and the vibrating sheet 53 penetrates into the flux. By slightly vibrating the vibrating sheet 53, the gaps between the particles in the flux are changed.

[0041] Among them, the streamlined water-drop-shaped discharging nozzle 55 can guide the flux to flow out at a stable flow rate, avoiding excessive or insufficient accumulation of the flux caused by uneven discharging. The special design (such as a sharp or beveled structure) at the front section of the discharging nozzle 55 can scrape off the oxide scale, dust or other impurities on the weld surface, reducing inclusion defects (such as slag inclusions or lack of fusion) in the weld. And the provided vibration ring 52 and vibrating sheet 53 adjust the gaps between the flux particles. By slightly vibrating and transmitting to the vibrating sheet 53 inside the flux, the gaps between the flux particles can be adjusted to form a moderate porosity. Appropriate gaps allow the gases (such as moisture decomposition gases) generated during the welding process to be discharged smoothly, reducing porosity defects. The optimized particle gaps contribute to uniform heat transfer to the flux and the workpiece surface. Vibration prevents the flux particles from adhering to each other due to static electricity or humidity, ensuring their loose state and facilitating subsequent recycling and reuse.

[0042] Embodiment 3: For the molten pool control mechanism 6 proposed in Embodiment 1, this embodiment provides a further technical solution for the molten pool control mechanism 6.

[0043] The molten pool control mechanism 6 includes a gas guiding shell 61, which is installed on the outer surface of the ring cover 77 and communicates with the inside of the ring cover 77. A conduit 62 is provided at the bottom of the gas guiding shell 61, and a material shell 63 is installed at the bottom of the conduit 62. A pushing rib 64 is provided on one side of the material shell 63.

[0044] The inner wall of the material shell 63 is connected with a material stacking and shaping shell 66 through a partition block. A baffle 65 is installed on the inner wall of the pushing rib 64. A number of strip-shaped holes 67 are formed in the inner wall of the material stacking and shaping shell 66. A guiding sheet 68 is installed between the material stacking and shaping shell 66 and the material shell 63 through a partition block.

[0045] It should be noted that after the preliminary plastic treatment by the flux feeding mechanism 5, the flux will be fed into the interior of the stacking and shaping shell 66 as the boiler part rotates. The welding machine enters the interior of the stacking and shaping shell 66 through the baffle 65. The provided stacking and shaping shell 66 and the material shell 63 are both in the shape of "Ω", so that the flux interface plasticized by the stacking and shaping shell 66 is trapezoidal. The inert gas fed into the interior of the gas guiding shell 61 through the wire processing mechanism 7 will be fed into the gap between the material shell 63 and the stacking and shaping shell 66 through the conduit 62. The baffle 65 first shapes the flux, and the baffle 65 will guide the gas between the stacking and shaping shell 66 and the material shell 63 to blow on the surface of the flux. Moreover, the strip holes 67 opened on the surface of the stacking and shaping shell 66 will also accelerate the gas to blow into the particle gaps between the fluxes; Since the temperature for cooling the wire processing mechanism 7 is attached to the gas blown into the gas guiding shell 61 through the wire processing mechanism 7, the gas blown into the flux gap will also carry a temperature to preheat the flux particles. The provided guiding piece 68 guides the gas to perform a secondary gas filling treatment on the flux particles plasticized by the stacking and shaping shell 66.

[0046] Among them, the Ω-shaped design of the stacking and shaping shell 66 and the material shell 63 guides the flux to accumulate into a trapezoidal cross-section, ensuring that a thicker protective layer is formed on both sides of the weld, reducing the risk of the edge area being exposed to the air, and reducing the probability of oxidation and nitriding defects. The inclined structure of the trapezoidal cross-section can guide the molten pool metal to flow along a predetermined path, avoiding the overflow or uneven accumulation of the molten metal, and improving the consistency of the weld formation. The flux enters the shaping shell as the boiler welding part rotates, ensuring that the flux is always in the best stacking form during the dynamic welding process. The baffle 65 guides the gas to blow on the surface of the flux, forming a continuous inert gas layer to isolate oxygen and nitrogen in the air. Moreover, the strip holes 67 on the surface of the stacking and shaping shell 66 accelerate the gas to enter the flux particle gaps, ensuring that the internal pores of the flux are also filled with inert gas to further isolate the air.

[0047] The gas introduced through the wire processing mechanism 7 has a preheating temperature (from the wire cooling process), preheating the flux particles and reducing the moisture content on their surfaces. The preheating reduces the adsorption of hydrogen in the flux, avoiding the hydrogen generated by the decomposition of moisture at high temperatures from causing pores or cracks.

[0048] Example 4. According to the wire processing mechanism 7 proposed in Example 1, this example provides a further technical solution for the wire processing mechanism 7.

[0049] The wire handling mechanism 7 includes a heating shell 74 which is installed in the middle of the lower end of the support frame 11. A heating coil 76 is arranged inside the heating shell 74. An air hood 71 is arranged at the lower end of the heating shell 74. A bobbin 75 is arranged in the middle of the air hood 71. A welding torch head 72 is arranged inside the bobbin 75. The welding wire 12 passes through the heating coil 76 and the bobbin 75 and extends into the inside of the welding torch head 72.

[0050] An air supply pipe 73 is connected to the outer surface of the air hood 71. An annular hood 77 is arranged on the outer surface of the air hood 71 and the annular hood 77 communicates with the inside of the air hood 71.

[0051] It should be noted that when the welding wire 12 is pushed by the wire feeding assembly 3, it will be sent into the inside of the bobbin 75. Before the welding wire 12 passes through the bobbin 75, it will pass through the heating coil 76, and the heating coil 76 heats the passing welding wire 12 to clean the moisture or debris on the surface of the welding wire 12 and perform a temperature rising treatment on the welding wire 12. The heat-treated welding wire 12 will enter the inside of the welding torch head 72 through the bobbin 75. The heat-treated welding wire 12 penetrates into the welding flux processed by the molten pool control mechanism 6, making the welding wire 12 strike an arc more stably. And after the gap of the welding machine is processed and combined with the inert gas at the gap of the welding flux, the control of the molten pool generated by the welding of the welding torch head 72 is optimized; Moreover, the inert gas entering the inside of the air hood 71 through the air supply pipe 73 will take away the temperature on the surface of the bobbin 75, thereby controlling the temperature transferred from the welding torch head 72 to the bobbin 75. The gas absorbing heat will be sent into the inside of the molten pool control mechanism 6 through the annular hood 77. And the gas flow rate inside the air supply pipe 73 is relatively low to ensure that the molten pool control mechanism 6 will not blow away the welding machine when filling the gas into the gaps between the welding flux particles.

[0052] Among them, the heating coil 76 heats the welding wire 12 to evaporate the moisture adsorbed on its surface, avoiding the decomposition of moisture to generate hydrogen at high temperature, thereby reducing the formation of pores and hydrogen-induced cracks and cleaning the surface. The heating process can remove the oil stain, oxide layer or other impurities on the surface of the welding wire 12, ensure the pure contact between the welding wire 12 and the molten pool, reduce slag inclusion or lack of fusion defects. The surface temperature of the preheated welding wire rises, reducing the difficulty of arc ignition and the risk of arc drift or extinction during arc starting, ensuring the continuity and stability of the welding process.

[0053] And the preheated welding wire 12 penetrates into the welding flux processed by the molten pool control mechanism 6 to ensure that the arc burns under a stable protective layer, reducing oxidation and nitridation caused by the intrusion of external air. The temperature matching between the welding wire 12 and the welding flux can optimize the distribution of heat input to the molten pool, reduce local overheating or uneven cooling, and improve the consistency of weld formation.

[0054] Example 5. The flux collection mechanism 8 proposed according to Example 1. This example provides a further technical solution for the flux collection mechanism 8.

[0055] The flux collection mechanism 8 includes a suction pipe 81. The suction pipe 81 is installed at the lower end of the suction air pipe 9. A suction nozzle 82 is provided at the lower end of the suction pipe 81. A bronchial tube 83 is communicated with the outer surface of the suction pipe 81. An elastic bracket 84 for supporting the bronchial tube 83 is provided between the suction pipe 81 and the bronchial tube 83. A cover shell 85 is provided at the lower end of the bronchial tube 83. Installation strips 87 are provided on both sides of the cover shell 85. Skirts 86 are sleeved on the outer surfaces of the two installation strips 87.

[0056] It should be noted that when the flux passes through the flux processing mechanism 7 for flux processing, a small amount of flux particles do not participate in the welding process. At this time, the air extraction device at one end of the suction air pipe 9 extracts the air inside the suction pipe 81, and the suction pipe 81 extracts a small amount of flux particles at the weld through the suction nozzle 82. When the suction air pipe 9 extracts the air inside the suction pipe 81, part of the suction force will be dispersed in the bronchial tube 83, and the air at the bottom of the cover shell 85 is extracted through the bronchial tube 83. The provided cover shell 85 is attached to the weld on the surface of the boiler through the skirt 86, and the cover shell 85 can cool the weld during welding.

[0057] Among them, the suction nozzle 82 accurately extracts a small amount of flux particles that do not participate in welding at the weld, avoiding waste caused by scattering or residue. The recycled flux can be reused after screening and drying. And the cover shell 85 is closely attached to the weld surface through the skirt 86 to form a sealed space, cooperating with the bronchial tube 83 to extract the air at the bottom, accelerating the transfer of heat from the weld to the outside, controlling the cooling rate, forming a convection in the cover shell 85, reducing local overheating or uneven cooling of the weld, and reducing welding deformation and residual stress.

[0058] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A boiler internal annular seam submerged arc automatic welding machine, comprising a wire feeding assembly (3), a welding wire (12) is arranged inside the wire feeding assembly (3), and a support frame (11) is arranged at the lower end of the wire feeding assembly (3), characterized in that: A hopper (10) and an air intake pipe (9) are respectively provided on both sides of the support frame (11); a flux feeding mechanism (5) for accumulating flux and changing the gap between flux particles is provided at the lower end of the hopper (10); a welding wire processing mechanism (7) for improving the arc starting performance of the welding wire (12) is provided in the middle of the support frame (11); a molten pool control mechanism (6) for improving arc stability is provided on one side of the welding wire processing mechanism (7); the molten pool control mechanism (6) is located between the flux feeding mechanism (5) and the welding wire processing mechanism (7); and a flux collecting mechanism (8) for cleaning the flux and cooling the weld is provided at the lower end of the air intake pipe (9); The molten pool control mechanism (6) comprises an air guide shell (61), a conduit (62) is provided at the bottom of the air guide shell (61), a material shell (63) is installed at the bottom of the conduit (62), and a push rib (64) is provided on one side of the material shell (63).

2. The boiler inner annular seam submerged arc automatic welding machine according to claim 1 is characterized in that: The welding wire processing mechanism (7) comprises a heating shell (74), the heating shell (74) being mounted at the middle of the lower end of the support frame (11), a heating coil (76) being arranged inside the heating shell (74), a gas hood (71) being arranged at the lower end of the heating shell (74), a wire drum (75) being arranged in the middle of the gas hood (71), a welding gun head (72) being arranged inside the wire drum (75), and the welding wire (12) passing through the heating coil (76) and the wire drum (75) and extending to the inside of the welding gun head (72).

3. The boiler inner annular seam submerged arc automatic welding machine according to claim 2 is characterized in that: The outer surface of the air hood (71) is connected to the air supply pipe (73), and the outer surface of the air hood (71) is provided with a ring hood (77), and the ring hood (77) is communicated with the interior of the air hood (71).

4. The boiler inner annular seam submerged arc automatic welding machine according to claim 3 is characterized in that: The air guide housing (61) is mounted on the outer surface of the annular cover (77) and communicates with the interior of the annular cover (77).

5. The boiler inner annular seam submerged arc automatic welding machine according to claim 4 is characterized in that: The inner wall of the material shell (63) is connected to a material stacking shaping shell (66) via a partition block, a blocking piece (65) is installed on the inner wall of the push rib (64), a plurality of strip holes (67) are opened on the inner wall of the material stacking shaping shell (66), and a guide piece (68) is installed between the material stacking shaping shell (66) and the material shell (63) via a partition block.

6. The boiler inner annular seam submerged arc automatic welding machine according to claim 5, characterized in that: The stack shaping shell (66) and the material shell (63) are both in an "Ω" shape.

7. The boiler inner annular seam submerged arc automatic welding machine according to claim 1, characterized in that: The flux unloading mechanism (5) comprises a discharge pipe (51), the discharge pipe (51) being mounted at the lower end of the hopper (10), the outer surface of the discharge pipe (51) being provided with a vibration ring (52), the interior of the vibration ring (52) being provided with a vibration sheet (53) penetrating into the flux, and the lower end of the discharge pipe (51) being provided with a discharge nozzle (55), the cross section of the discharge nozzle (55) being in the shape of a stream-type water drop.

8. The boiler inner annular seam submerged arc automatic welding machine according to claim 7, characterized in that: The flux unloading mechanism (5) further comprises two guide plates (54), the opposite surfaces of the two guide plates (54) are provided with mounting blocks (56), and the two guide plates (54) are respectively mounted on both sides of the discharge nozzle (55) through the mounting blocks (56) for shaping the flux.

9. The boiler inner annular seam submerged arc automatic welding machine according to claim 1, characterized in that: The flux collecting mechanism (8) comprises a suction pipe (81), the suction pipe (81) being mounted at the lower end of the suction pipe (9), a suction nozzle (82) being provided at the lower end of the suction pipe (81), an outer surface of the suction pipe (81) being connected to a bronchial tube (83), and an elastic bracket (84) for supporting the bronchial tube (83) being provided between the suction pipe (81) and the bronchial tube (83); A cover shell (85) is provided at the lower end of the bronchus (83), mounting strips (87) are provided on both sides of the cover shell (85), and skirt edges (86) are provided on the outer surfaces of the two mounting strips (87).

10. The boiler internal annular seam submerged arc automatic welding machine according to claim 1, characterized in that: A boiler frame (1) is arranged inside the wire feeding assembly (3), and a welding wire turntable (2) for winding the welding wire (12) is arranged on one side of the wire feeding assembly (3).

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