Welding device for submerged arc welding

Abstract

The invention relates to the technical field of submerged-arc welding machines, in particular to a welding device for submerged-arc welding. Comprising a conductive rod, a conductive nozzle and a mounting cylinder which are coaxially arranged, the conductive rod is coaxially provided with a first channel, the conductive nozzle is coaxially provided with a second channel opposite to the first channel, the upper end of the mounting cylinder is in threaded connection with the conductive rod, a mounting seat is coaxially arranged in the mounting cylinder, and the mounting seat is in threaded connection with the conductive nozzle. A third channel opposite to the first channel is arranged in the mounting cylinder, an air inlet cavity and an air outlet cavity are formed between the mounting cylinder and the mounting base, air outlet holes are formed in the mounting base in the circumferential direction of the mounting base, and an air inlet pipe communicated with the air inlet cavity is arranged on the outer wall of the mounting cylinder. By arranging the gas inlet cavity, the gas outlet cavity and the gas outlet holes distributed in the circumferential direction, protective gas enters the gas inlet cavity through the gas inlet pipe and then enters the gas outlet cavity through the gas inlet cavity, so that the protective gas can uniformly cover a welding area, oxygen is effectively isolated, and the compactness and the mechanical property of a welding seam are remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of submerged arc welding machines, and specifically to a welding device for submerged arc welding. Background Art

[0002] Submerged arc welding is an important welding method in welding production. It is an arc welding method where the arc burns under a layer of welding flux. It is mainly used for welding various steel plate structures. The steel types that can be welded include carbon structural steel, stainless steel, heat-resistant steel, and their composite steel materials. For multi-strand composite welding wires, the welding arc belongs to a continuously rotating arc, the molten pool is stirred in real time, the molten pool is uniform, and the weld quality is high. When each welding wire melts, the splashes offset each other instantaneously, forming a solid-core welding wire welding process with almost no splashes, greatly reducing the workload of the subsequent grinding process. The welding process smoke is reduced by at least more than 60%. Moreover, it is energy-efficient and environmentally friendly during production, the weld layer has excellent low-temperature impact toughness, and the process adjustment range is wide. Under the same welding specification process requirements, replacing single-wire submerged arc welding with multi-strand composite welding wires can increase the welding efficiency by at least 45%, and the heat input decreases by at least more than 30%.

[0003] The utility model patent CN211192440U discloses a submerged arc welding automatic adjustment device, which includes a submerged arc welding system, an image acquisition system, a control system, and an automatic adjustment system. The submerged arc welding system, the image acquisition system, and the automatic adjustment system are all electrically connected to the control system. The submerged arc welding system includes a submerged arc welding head and a welding torch arranged below the submerged arc welding head. The image acquisition system includes a camera arranged around the welding torch. The automatic adjustment system includes a lifting adjustment mechanism for driving the submerged arc welding head to move up and down, a translation adjustment mechanism for driving the submerged arc welding head to move horizontally, and a rotation adjustment mechanism for driving the submerged arc welding head to rotate.

[0004] The above patent can achieve the welding of welds, but there are still some problems: 1. When the welding surface is an arc surface, the welding flux cannot adhere well to the surface of the weld, resulting in oxygen in the air easily entering the welding area, leading to a decline in welding quality.

[0005] 2. During the welding process, there is a lack of heat dissipation measures for the conductive rod, resulting in the overall heat dissipation not meeting the usage requirements, and the conductive rod of the welding torch getting extremely hot.

[0006] 3. The instantaneous current during arc ignition is too large, and there is a situation where secondary arc ignition occurs, leading to the conductive nozzle being easily burned. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to provide a welding device for submerged arc welding, which introduces a shielding gas during the welding process to ensure welding quality.

[0008] The technical solution adopted by the present invention to solve its technical problems is a welding device for submerged arc welding, including a coaxial conductive rod, a conductive nozzle and a mounting cylinder. A first channel is coaxially arranged on the conductive rod, and a second channel opposite to the first channel is coaxially arranged on the conductive nozzle. The upper end of the mounting cylinder is threadedly connected to the conductive rod, and a mounting seat is coaxially arranged in the mounting cylinder. The mounting seat is threadedly connected to the conductive nozzle. A third channel opposite to the first channel is arranged in the mounting cylinder. An air inlet cavity and an air outlet cavity are formed between the mounting cylinder and the mounting seat. The mounting seat is provided with air outlet holes communicating the air inlet cavity and the air outlet cavity along its circumferential direction. An air inlet pipe communicating with the air inlet cavity is arranged on the outer wall of the mounting cylinder.

[0009] Further, a filter screen covering the air outlet holes is arranged in the air outlet cavity. A wire mesh pressing spring ring is arranged on the filter screen, and a wire mesh pressing ring is arranged on the wire mesh pressing spring ring.

[0010] Further, a coaxially arranged protective sleeve is threadedly connected below the mounting cylinder, and the lower end surface of the protective sleeve is lower than the lower end surface of the conductive nozzle.

[0011] Further, the mounting cylinder includes a first cylinder, an insulating cylinder and a second cylinder arranged in sequence from top to bottom. The upper end of the mounting seat is threadedly connected to the first cylinder, the lower end of the mounting seat is threadedly connected to the insulating cylinder, and the second cylinder is threadedly connected to the insulating cylinder.

[0012] Further, a first cooling ring cavity is arranged at the upper end of the first cylinder, and a first water inlet pipe and a first water outlet pipe communicating with the first cooling ring cavity are arranged on the outer wall of the first cooling ring cavity.

[0013] Further, a second cooling ring cavity is arranged on the inner circumferential surface of the second cylinder, and a second water inlet pipe and a second water outlet pipe communicating with the second cooling ring cavity are arranged on the outer wall of the second cylinder.

[0014] Further, the first water outlet pipe is communicated with the second water inlet pipe.

[0015] Further, a weight reduction groove is arranged on the outer surface of the conductive rod.

[0016] Further, the conductive rod is arranged in multiple sections, and adjacent two sections of the conductive rod are threadedly connected.

[0017] The beneficial effects of the present invention are as follows: By arranging an air inlet cavity, an air outlet cavity and circumferentially distributed air outlet holes, the shielding gas enters the air inlet cavity through the air inlet pipe and then enters the air outlet cavity through the air inlet cavity, so that the shielding gas can uniformly cover the welding area, effectively isolate oxygen, is especially suitable for arc surface welding, and significantly improves the density and mechanical properties of the weld. Description of the Drawings

[0018] Figure 1is a schematic structural diagram of the present invention; Figure 2 is a schematic diagram of the mounting base; Figure 3 is a schematic diagram of the filter screen; Figure 4 is a schematic diagram of the wire pressing spring ring; Figure 5 is a schematic diagram of the wire pressing ring.

[0019] Reference numerals: 1 - conductive rod; 101 - first channel; 2 - conductive nozzle; 201 - second channel; 3 - mounting cylinder; 301 - third channel; 302 - air inlet cavity; 303 - air outlet cavity; 304 - air outlet hole; 305 - filter screen; 306 - wire pressing spring ring; 307 - wire pressing ring; 4 - mounting base; 5 - intake pipe; 6 - protective sleeve; 7 - first cylinder; 8 - insulating cylinder; 9 - second cylinder; 10 - first cooling ring cavity; 11 - first water inlet pipe; 12 - first water outlet pipe; 13 - second cooling ring cavity; 14 - second water inlet pipe; 15 - second water outlet pipe; 16 - weight reduction groove. Detailed Description of the Invention

[0020] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation of the present invention.

[0021] As Figure 1 - Figure 2 shown, a welding device for submerged arc welding of the present invention includes a coaxially arranged conductive rod 1, a conductive nozzle 2 and a mounting cylinder 3. A first channel 101 is coaxially arranged on the conductive rod 1, and a second channel 201 opposite to the first channel 101 is coaxially arranged on the conductive nozzle 2. The upper end of the mounting cylinder 3 is threadedly connected to the conductive rod 1. A mounting base 4 is coaxially arranged inside the mounting cylinder 3, and the mounting base 4 is threadedly connected to the conductive nozzle 2. A third channel 301 opposite to the first channel 101 is arranged inside the mounting cylinder 3. An air inlet cavity 302 and an air outlet cavity 303 are formed between the mounting cylinder 3 and the mounting base 4. The mounting base 4 is provided with air outlet holes 304 communicating the air inlet cavity 302 and the air outlet cavity 303 along its circumference. An intake pipe 5 communicating with the air inlet cavity 302 is arranged on the outer wall of the mounting cylinder 3.

[0022] Among them, the conductive rod 1 and the conductive nozzle 2 are both long rod-shaped components made of conductive materials. The inner cavity of the mounting cylinder 3 is cylindrical. An internal thread is provided at the upper end of the mounting cylinder 3, and an external thread is provided at the lower end of the conductive rod 1 to realize the threaded connection between the conductive rod 1 and the mounting cylinder 3; the first channel 101, the second channel 201, and the third channel 301 jointly form a conveying path for the welding wire; the mounting seat 4 is cylindrical and is adapted to the inner cavity of the mounting cylinder 3, and can be connected to the inner wall of the mounting cylinder 3 by means of threaded connection. The mounting seat 4 provides a mounting base for the conductive nozzle 2. An internal thread is provided on the mounting seat 4, and an external thread is provided at the upper end of the conductive nozzle 2 to realize the threaded connection between the mounting seat 4 and the conductive nozzle 2. An air inlet cavity 302 and an air outlet cavity 303 are formed between the mounting cylinder 3 and the mounting seat 4. The air inlet cavity 302 is externally connected to a protective gas source (such as argon, carbon dioxide, etc.) through an air inlet pipe 5. A plurality of air outlet holes 304 are circumferentially distributed on the mounting seat 4, connecting the air inlet cavity 302 and the air outlet cavity 303, so that the protective gas evenly surrounds the welding area, isolates oxygen, and avoids oxidation of the weld seam.

[0023] During the welding process, welding slag will be generated. Impurities such as splashed welding slag are likely to block the air outlet holes 304 on the mounting seat 4 after cooling. Further, referring to Figure 2 - Figure 5 , a filter screen 305 covering the air outlet holes 304 is arranged in the air outlet cavity 303. A retaining spring ring 306 is arranged on the filter screen 305, and a retaining ring 307 is arranged on the retaining spring ring 306. An annular mounting groove can be arranged below the mounting seat 4. The retaining ring 307 can be fixed in the mounting groove by screws or arranged in the mounting groove by interference fit. The filter screen 305 is arranged on the surface of the air outlet holes 304. The retaining ring 307 applies pressure to the retaining spring ring 306, so that the filter screen 305 can closely adhere to the air outlet holes 304 to prevent the air outlet holes 304 from being blocked.

[0024] In order to provide sufficient gas protection for the welding position, further, referring to Figure 1 , a coaxially arranged protective sleeve 6 is threadedly connected below the mounting cylinder 3, and the lower end surface of the protective sleeve 6 is lower than the lower end surface of the conductive nozzle 2. Such a setting extends the length of the air outlet cavity 303. At the same time, since the lower end surface of the protective sleeve 6 is lower than the lower end surface of the conductive nozzle 2, it can ensure that the protective gas can completely cover the conductive nozzle 2, isolate the conductive nozzle 2 from the air, and at the same time the protective sleeve 6 can also reduce the splashing of welding slag.

[0025] In order to solve the problem that secondary arcing is likely to occur when the conductive nozzle 2 ignites the arc, which leads to burning of the nozzle, necessary insulation measures should be taken between the conductive rod 1 and the conductive nozzle 2 to ensure that the current enters the welding wire through the shortest path. Further, referring to Figure 1, the mounting cylinder 3 includes a first cylinder 7, an insulating cylinder 8, and a second cylinder 9 arranged in sequence from top to bottom. The upper end of the mounting base 4 is threadedly connected to the first cylinder 7, the lower end of the mounting base 4 is threadedly connected to the insulating cylinder 8, and the second cylinder 9 is threadedly connected to the insulating cylinder 8. Both the first cylinder 7 and the second cylinder 9 are made of conductive materials, and the insulating cylinder 8 can be made of ceramic or bakelite. External threads are provided on the outer surface of the mounting base 4, and internal threads are provided on the inner surface of the first cylinder 7 to achieve the threaded connection between the mounting base 4 and the first cylinder 7. Internal threads are provided on the inner surface of the insulating cylinder 8 to achieve the threaded connection between the insulating cylinder 8 and the mounting base 4. It should be noted here that in order to make the structure more compact, the lower end surface of the first cylinder 7 abuts against the upper end surface of the insulating cylinder 8. Internal threads are provided on the inner surface of the second cylinder 9, and external threads are provided on the outer surface of the insulating cylinder 8 to achieve the threaded connection between the second cylinder 9 and the insulating cylinder 8.

[0026] To achieve the heat dissipation of the conductive rod 1, further, refer to Figure 1 , a first cooling ring cavity 10 is provided at the upper end of the first cylinder 7, and a first water inlet pipe 11 and a first water outlet pipe 12 communicating with the first cooling ring cavity 10 are provided on the outer wall of the first cooling ring cavity 10. The conductive rod 1 is threadedly connected to the first cylinder 7, and the heat of the conductive rod 1 will be conducted to the first cylinder 7. The coolant is injected from the first water inlet pipe 11 and flows in the first cooling ring cavity 10. After absorbing the heat transferred from the conductive rod 1 to the first cylinder 7, it is discharged through the first water outlet pipe 12 to achieve the heat dissipation of the conductive rod 1.

[0027] To achieve the heat dissipation of the conductive nozzle 2, further, refer to Figure 1 , a second cooling ring cavity 13 is provided on the inner peripheral surface of the second cylinder 9, and a second water inlet pipe 14 and a second water outlet pipe 15 communicating with the second cooling ring cavity 13 are provided on the outer wall of the second cylinder 9. The coolant enters the second cooling ring cavity 13 through the second water inlet pipe 14. Since there is heat conduction between the inner wall of the second cooling ring cavity 13 and the air outlet cavity 303, when the coolant flows in the second cooling ring cavity 13, the temperature in the air outlet cavity 303 can be reduced, thereby achieving the heat dissipation of the conductive nozzle 2.

[0028] To make the structure more compact, further, refer to Figure 1 , the first water outlet pipe 12 is communicated with the second water inlet pipe 14. The first water outlet pipe 12 is communicated with the second water inlet pipe 14, so that the coolant flows through the first cooling ring cavity 10 and the second cooling ring cavity 13 in sequence to form a series circuit. This design improves the utilization rate of the coolant, reduces energy consumption, simplifies the pipeline layout, and enhances the compactness of the device.

[0029] Further, refer to Figure 1, a weight-reducing groove 16 is provided on the outer surface of the conductive rod 1. The weight-reducing groove 16 is an annular groove, which reduces the weight on the premise of ensuring the structural strength, reduces the operation fatigue, and at the same time increases the heat dissipation surface area and improves the cooling efficiency.

[0030] Further, referring to Figure 1 , the conductive rod 1 is provided in multiple segments, and adjacent two segments of the conductive rod 1 are connected by threads. For example, the conductive rod 1 can be provided in two segments, three segments, etc., and the length can be flexibly adjusted according to the welding depth requirements. When damaged, only the local segment needs to be replaced, reducing the maintenance cost.

[0031] The embodiments of the specific implementation manners are all preferred embodiments of the present invention, and do not limit the protection scope of the present invention accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. A welding device for submerged arc welding, comprising a coaxially arranged conductive rod (1), a conductive nozzle (2) and a mounting tube (3), wherein the conductive rod (1) is coaxially provided with a first channel (101), the conductive nozzle (2) is coaxially provided with a second channel (201) opposite to the first channel (101), and the upper end of the mounting tube (3) is threadedly connected to the conductive rod (1), characterized in that: A mounting seat (4) is coaxially arranged inside the mounting cylinder (3), the mounting seat (4) being threadedly connected to the conductive nozzle (2), a third channel (301) opposite to the first channel (101) being arranged inside the mounting cylinder (3), an air inlet cavity (302) and an air outlet cavity (303) being formed between the mounting cylinder (3) and the mounting seat (4), an air outlet hole (304) communicating with the air inlet cavity (302) and the air outlet cavity (303) being arranged on the circumference of the mounting cylinder (4), and an air inlet pipe (5) communicating with the air inlet cavity (302) being arranged on the outer wall of the mounting cylinder (3).

2. A welding device for submerged arc welding according to claim 1, characterized in that: A filter screen (305) covering the air outlet hole (304) is arranged in the air outlet cavity (303), a screen pressing elastic ring (306) is arranged on the filter screen (305), and a screen pressing ring (307) is arranged on the screen pressing elastic ring (306).

3. A welding device for submerged arc welding according to claim 1, characterized in that: A coaxially arranged protective sleeve (6) is threadedly connected to the lower portion of the mounting cylinder (3), and a lower end surface of the protective sleeve (6) is lower than a lower end surface of the conductive nozzle (2).

4. A welding device for submerged arc welding according to claim 1, characterized in that: The mounting cylinder (3) comprises a first cylinder (7), an insulating cylinder (8) and a second cylinder (9) which are arranged in sequence from top to bottom; the upper end of the mounting seat (4) is threadedly connected to the first cylinder (7); the lower end of the mounting seat (4) is threadedly connected to the insulating cylinder (8); and the second cylinder (9) is threadedly connected to the insulating cylinder (8).

5. A welding device for submerged arc welding as claimed in claim 4, characterized in that: A first cooling ring cavity (10) is provided at the upper end of the first cylinder (7), and a first water inlet pipe (11) and a first water outlet pipe (12) which are in communication with the first cooling ring cavity (10) are provided on the outer wall of the first cooling ring cavity (10).

6. A welding device for submerged arc welding as claimed in claim 5, characterized in that: A second cooling annular cavity (13) is provided on the inner circumferential surface of the second cylinder (9), and a second water inlet pipe (14) and a second water outlet pipe (15) which are in communication with the second cooling annular cavity (13) are provided on the outer wall of the second cylinder (9).

7. A welding device for submerged arc welding according to claim 6, characterized in that: The first water outlet pipe (12) is in communication with the second water inlet pipe (14).

8. A welding device for submerged arc welding according to claim 1, characterized in that: The outer surface of the conductive rod (1) is provided with a weight-reducing groove (16).

9. A welding device for submerged arc welding according to claim 1, characterized in that: The conductive rod (1) is arranged in multiple sections, and two adjacent sections of the conductive rod (1) are connected via threads.

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