A plasma arc welding device and method based on steel pipe processing

Abstract

This invention belongs to the field of steel pipe processing technology, specifically a plasma arc welding device and method based on steel pipe processing. Addressing the issue that after the molten metal in the weld pool is generated, it flows outwards along the arc of the steel pipe surface, causing humps and other defects at the weld point, thus affecting the welding quality, the following solution is proposed: a processing base with two guide roller frames mounted on it, and multiple fixing components mounted on the two guide roller frames; and multiple spring supports. This invention discloses a plasma arc welding device and method for steel pipe processing that improves the welding quality. During welding, the device guides the molten metal inside the weld pool, preventing it from flowing outwards along the arc of the steel pipe surface, thereby avoiding humps and other defects at the weld point and increasing the welding effectiveness of the device.

Description

Technical Field

[0001] This invention relates to the field of steel pipe processing technology, and in particular to a plasma arc welding equipment and method based on steel pipe processing. Background Technology

[0002] Steel pipe is a type of steel with a hollow cross-section and a length much greater than its diameter or circumference. It is an indispensable and important product in modern industry and social infrastructure and is known as the "blood vessels" of industry.

[0003] Plasma arc welding is a highly efficient welding method that uses a plasma arc as a heat source. It obtains a highly concentrated plasma flow by compressing the arc, thereby melting and joining metal materials. The principle is to generate an arc between the tungsten electrode and the workpiece. Through the mechanical compression, thermal compression, and electromagnetic compression effects of the nozzle, the energy density of the arc is significantly increased, forming a plasma arc with a temperature of up to tens of thousands of degrees Celsius.

[0004] When existing steel pipes are subjected to plasma arc welding, a molten pool is generated at the welding point due to the high temperature. However, since the surface of the steel pipe itself is arc-shaped, after the molten pool is generated, the molten metal inside will flow outward from the welding point along the arc of the steel pipe surface, resulting in a hump at the welding point, which affects the welding quality of the steel pipe. Summary of the Invention

[0005] This invention discloses a plasma arc welding device and method based on steel pipe processing, aiming to solve the technical problem in the background art where, after the molten pool is generated, the molten metal inside flows outward from the welding point along the arc of the steel pipe surface, resulting in a hump at the welding point, which affects the welding quality of steel pipe processing.

[0006] This invention proposes a plasma arc welding device based on steel pipe processing, comprising:

[0007] A processing base is provided, on which two guide roller frames are provided, and on the two guide roller frames are multiple fixing components;

[0008] Multiple spring supports are respectively set on multiple fixing parts, and the same conveying guide roller is set on every two spring supports;

[0009] The mounting bracket is mounted on the processing base, and the processing base is provided with two mounting ring frames;

[0010] A molten pool guiding unit is mounted on a mounting bracket. The molten pool guiding unit includes two adjusting guiding components, a fixed guiding component one, and a fixed guiding component two.

[0011] The welding alignment module is set on two mounting ring frames and includes multiple alignment pressure rollers and three fixed frames.

[0012] In a preferred embodiment, the molten pool guiding unit further includes:

[0013] A linear guide rail is mounted on a mounting bracket. A linear lead screw is mounted on the linear guide rail, and the linear lead screw and the linear guide rail share the same movable base block.

[0014] A stepper motor is mounted on a linear guide rail, and the output shaft of the stepper motor is connected to one end of a linear lead screw via a coupling.

[0015] A connecting frame is provided on the movable base block, and the connecting frame has four mounting ports.

[0016] In a preferred embodiment, the molten pool guiding unit further includes:

[0017] Four guide rods are respectively set inside the four mounting ports. One end of each of the four guide rods is provided with the same abutment frame, and the second fixed guide is set on the abutment frame.

[0018] Four telescopic springs are respectively set on the outside of the four guide rods. One end of each of the four telescopic springs is fixedly connected to the outer wall of the connecting frame, and the other end of each of the four telescopic springs is fixedly connected to the outer wall of the abutment frame.

[0019] In a preferred embodiment, the molten pool guiding unit further includes:

[0020] The welding torch body is mounted on the connecting frame and is positioned between four guide rods.

[0021] Three shaft members are provided, all three shaft members are provided on the abutment frame, and two of the aforementioned adjusting guide members are respectively provided at one end of two of the shaft members, and the other end of the two shaft members are respectively provided with a linkage wheel and a driven gear;

[0022] A driving gear is located at one end of another shaft member and meshes with a driven gear.

[0023] In a preferred embodiment, the molten pool guiding unit further includes:

[0024] A transmission wheel is mounted on the drive gear, and the transmission wheel and the linkage wheel are provided with the same transmission belt;

[0025] An active motor is mounted on the abutment frame, and the output shaft of the active motor is connected to the outer wall of the linkage wheel via a coupling.

[0026] Two flexible hoses are provided, both of which are mounted on the fixed guide member 2. One end of each of the two flexible hoses is connected to the interior of the two adjusting guide members.

[0027] In a preferred embodiment, the molten pool guiding unit further includes:

[0028] Two connecting pipes are provided, both of which are mounted on the second fixed guide member, and the first fixed guide member is mounted on one end of the two connecting pipes;

[0029] A delivery pump is mounted on a connecting frame. The input end of the delivery pump is equipped with a threaded joint, and a guide gas cylinder is mounted on the threaded joint.

[0030] A delivery pipe is installed at the output end of the delivery pump, and the output end of the delivery pipe is connected to the interior of the fixed guide member two.

[0031] In a preferred embodiment, the welding alignment module further includes:

[0032] Two annular air chambers are respectively disposed on two mounting ring frames, and multiple cleaning holes are provided on each of the two annular air chambers;

[0033] Two gear rings are respectively set on two annular air chambers;

[0034] Two mounting components are respectively mounted on two mounting ring frames. Each mounting component is provided with a mounting shaft, and one end of each mounting shaft is provided with a drive gear. The two drive gears mesh with the two gear rings respectively.

[0035] In a preferred embodiment, the welding alignment module further includes:

[0036] A dual-axis motor is mounted on a machining base, and the two output shafts of the dual-axis motor are respectively connected to the other ends of two mounting shafts via couplings.

[0037] Multiple fixing brackets are respectively set on two mounting ring frames, and each of the multiple fixing brackets is equipped with an electric push rod. The three fixing frames are respectively set on the output end of the multiple electric push rods.

[0038] Two air pump bodies are mounted on one of the fixed frames. Each of the two air pump bodies has an air filter chamber at its output end. Each of the two air filter chambers has two connecting pipes at its output end. The output ends of the four connecting pipes are respectively connected to the interior of the two annular air chambers.

[0039] In a preferred embodiment, the welding alignment module further includes:

[0040] Multiple mounting rods are respectively set on three fixed frames, and multiple alignment pressure rollers are respectively set on multiple mounting rods;

[0041] Multiple servo motors are mounted on three fixed frames, and the output shafts of the multiple servo motors are connected to one end of multiple mounting rods via couplings.

[0042] A plasma arc welding method based on steel pipe processing, using a plasma arc welding equipment based on steel pipe processing as described above, includes the following steps:

[0043] Step 1: Place the steel pipes on the conveying guide rollers on both sides and convey them into the inside of the two mounting ring frames. At the same time, the welding alignment module runs to clean the outer wall of the steel pipes until the welding ends of the two steel pipes contact each other.

[0044] Step 2: Before welding the steel pipes, the welding alignment module runs again to press and align the outer walls of the two steel pipes.

[0045] Step 3: During welding, the molten pool guiding unit operates to move the welding torch body to the welding position and to guide the welding and molten metal flow.

[0046] Step 4: During the welding process, the welding alignment module operates synchronously, causing the steel pipe to rotate until the welding process is completed.

[0047] As can be seen from the above, the plasma arc welding equipment based on steel pipe processing provided by the present invention has the function of improving the welding quality of steel pipe processing. During the welding process, the device can guide the molten metal inside the weld pool to prevent the molten metal from flowing out of the welding point along the arc of the steel pipe surface, thereby avoiding the appearance of humps at the welding point and increasing the welding effect of the device. Attached Figure Description

[0048] Figure 1 This is a schematic diagram of the overall structure of a plasma arc welding equipment based on steel pipe processing proposed in this invention;

[0049] Figure 2 This is a schematic diagram of the overall bottom view of a plasma arc welding equipment based on steel pipe processing proposed in this invention;

[0050] Figure 3 This is a schematic diagram of the welding alignment module and mounting ring frame combination structure of a plasma arc welding equipment based on steel pipe processing proposed in this invention.

[0051] Figure 4 This is a schematic diagram of the molten pool guiding unit structure of a plasma arc welding equipment based on steel pipe processing proposed in this invention;

[0052] Figure 5 This is a schematic diagram of the disassembled structure of the guide gas cylinder and the telescopic spring in a plasma arc welding equipment based on steel pipe processing proposed in this invention.

[0053] Figure 6 This is a schematic diagram of a combined structure of a fixed flow guide component 2 and an elastic hose for a plasma arc welding equipment based on steel pipe processing, as proposed in this invention.

[0054] Figure 7 This is a schematic cross-sectional view of the contact frame structure of a plasma arc welding device based on steel pipe processing proposed in this invention.

[0055] Figure 8 This is a schematic diagram of the welding alignment module structure of a plasma arc welding equipment based on steel pipe processing proposed in this invention;

[0056] Figure 9 This is a schematic diagram of the combined structure of an annular gas chamber and gear ring in a plasma arc welding device based on steel pipe processing proposed in this invention.

[0057] Figure 10 This is a schematic diagram of the alignment pressure roller and servo motor combination structure of a plasma arc welding equipment based on steel pipe processing proposed in this invention.

[0058] In the diagram: 1. Machining base; 2. Guide roller frame; 3. Conveyor guide roller; 4. Mounting bracket; 5. Molten pool guide unit; 501. Stepper motor; 502. Linear guide rail; 503. Guide gas cylinder; 504. Connecting frame; 505. Welding torch body; 506. Abutment frame; 507. Linear lead screw; 508. Movable base block; 509. Threaded joint; 510. Guide rod component; 511. Telescopic spring; 512. Conveyor pump; 513. Conveyor pipe; 514. Fixed guide component one; 515. Elastic hose; 516. Fixed guide component two; 517. Connecting pipe; 518. Adjustable guide component; 519. Shaft component; 520. 521 Passive gear; 522 Driven gear; 523 Transmission wheel; 524 Drive belt; 525 Linkage wheel; 526 Driven motor; 6. Welding alignment module; 601 Dual-axis motor; 602 Mounting shaft; 603 Drive gear; 604 Fixing frame; 605 Fixing bracket; 606 Mounting component; 607 Gear ring; 608 Annular air chamber; 609 Electric push rod; 610 Connecting pipe; 611 Air filter chamber; 612 Air pump body; 613 Cleaning hole; 614 Servo motor; 615 Mounting rod; 616 Alignment pressure roller; 7. Spring bracket; 8. Fixing component; 9. Mounting ring frame. Detailed Implementation

[0059] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0060] The plasma arc welding equipment for steel pipe processing disclosed in this invention is mainly used in scenarios where, after the molten metal pool is generated, the molten metal inside flows outward from the welding point along the arc of the steel pipe surface, causing a hump or other issues at the welding point, thus affecting the welding quality of the steel pipe processing.

[0061] Reference Figures 1-10 A plasma arc welding device based on steel pipe processing, comprising:

[0062] A processing base 1 is provided, on which two guide roller frames 2 are provided, and on which multiple fixing parts 8 are provided;

[0063] Multiple spring supports 7 are respectively set on multiple fixing parts 8, and the same conveying guide roller 3 is set on every two spring supports 7;

[0064] Mounting bracket 4 is mounted on processing base 1, and processing base 1 is provided with two mounting ring frames 9;

[0065] The molten pool guiding unit 5 is mounted on the mounting bracket 4. The molten pool guiding unit 5 includes two adjusting guiding components 518, a first fixed guiding component 514, and a second fixed guiding component 516.

[0066] The welding alignment module 6 is set on two mounting ring frames 9. The welding alignment module 6 includes multiple alignment pressure rollers 616 and three fixing frames 604.

[0067] Reference Figure 1 and Figures 3-7 In a preferred embodiment, the molten pool guiding unit 5 further includes:

[0068] Linear guide 502 is mounted on mounting bracket 4. Linear lead screw 507 is mounted on linear guide 502. Linear lead screw 507 and linear guide 502 are mounted on the same movable base block 508.

[0069] Stepper motor 501 is mounted on linear guide rail 502. The output shaft of stepper motor 501 is connected to one end of linear lead screw 507 via a coupling.

[0070] The connecting frame 504 is mounted on the movable base block 508 and has four mounting ports.

[0071] In this invention, the molten pool guiding unit 5 further includes:

[0072] Four guide rods 510 are respectively set inside the four mounting ports. One end of each of the four guide rods 510 is provided with the same abutment frame 506. The second fixed guide member 516 is set on the abutment frame 506.

[0073] Four telescopic springs 511 are respectively disposed on the outside of the four guide rods 510. One end of each of the four telescopic springs 511 is fixedly connected to the outer wall of the connecting frame 504, and the other end of each of the four telescopic springs 511 is fixedly connected to the outer wall of the abutment frame 506.

[0074] In this invention, the molten pool guiding unit 5 further includes:

[0075] The welding torch body 505 is mounted on the connecting frame 504 and is positioned between the four guide rods 510.

[0076] Three shaft members 519 are all set on the abutment frame 506. Two adjusting guide members 518 are respectively set at one end of two of the shaft members 519. The other end of the two shaft members 519 is respectively set with a linkage wheel 524 and a driven gear 520.

[0077] The driving gear 521 is located at one end of another shaft member 519 and meshes with the driven gear 520.

[0078] In this invention, the molten pool guiding unit 5 further includes:

[0079] A transmission wheel 522 is mounted on a drive gear 521, and the same transmission belt 523 is mounted on the transmission wheel 522 and the linkage wheel 524.

[0080] The active motor 525 is mounted on the abutment frame 506, and the output shaft of the active motor 525 is connected to the outer wall of the linkage wheel 524 via a coupling.

[0081] Two flexible hoses 515 are provided on the fixed guide member 516, and one end of each of the two flexible hoses 515 is connected to the interior of the two adjusting guide members 518.

[0082] In this invention, the molten pool guiding unit 5 further includes:

[0083] Two connecting pipes 517 are both mounted on the second fixed guide member 516, and the first fixed guide member 514 is mounted on one end of the two connecting pipes 517.

[0084] A delivery pump 512 is mounted on a connecting frame 504. The input end of the delivery pump 512 is provided with a threaded connector 509, and a guide gas cylinder 503 is mounted on the threaded connector 509.

[0085] The conveying pipe 513 is located at the output end of the conveying pump 512, and the output end of the conveying pipe 513 is connected to the interior of the fixed guide member 516.

[0086] Specifically, during welding, the stepper motor 501 operates, driving the linear lead screw 507 to rotate. This, in turn, causes the linear lead screw 507 to move the movable base block 508 along the linear guide rail 502. The movable base block 508, together with the connecting frame 504, moves the welding torch body 505 to the welding position for welding. Simultaneously, the abutment frame 506 contacts the surface of the steel pipe. At this time, the drive motor 525 operates, driving the linkage wheel 524 to rotate. This, in turn, causes the linkage wheel 524 to rotate one of the shaft members 519 and the adjusting guide member 518, adjusting the airflow angle. Simultaneously, the linkage wheel 524, in conjunction with the transmission belt 523 and the transmission wheel 522, can... The driving gear 521 rotates, and since the driving gear 521 meshes with the driven gear 520, the driven gear 520 can drive another shaft 519 and the adjusting guide 518 to rotate synchronously, so as to adjust to a suitable angle according to the size of the steel pipe. Then, as the weld pool is generated, the delivery pump 512 runs. The delivery pump 512 delivers the inert gas inside the guide gas cylinder 503 through the delivery pipe 513 to the fixed guide 516, and further delivers it through the elastic hose 515 and the connecting pipe 517 to the two adjusting guides 518 and the fixed guide 514, and sprays the gas at a certain angle to guide and blow the molten metal in the weld pool until the welding is completed.

[0087] In specific application scenarios, the molten pool guiding unit 5 is suitable for the steel pipe processing and welding process. That is, the molten pool guiding unit 5 can guide the molten metal inside the molten pool generated by welding, preventing the molten metal from flowing out of the welding point along the arc of the steel pipe surface, thereby avoiding adverse conditions such as humps at the welding point, thus increasing the welding processing quality of the device. Moreover, when guiding the welding flow, the guiding component 518 can be adjusted at an angle according to the surface size of the steel pipe to ensure its guiding effect, while avoiding the influence of airflow deviation on the plasma arc welding, thus increasing the effectiveness of the device.

[0088] It should be noted that the guide gas cylinder 503 contains inert gas to prevent the gas from adversely affecting the weld during the guide process. In addition, the guide gas cylinder 503 is a detachable device.

[0089] Reference Figure 1 , Figure 3 , Figure 8 , Figure 9 and Figure 10 In a preferred embodiment, the welding alignment module 6 further includes:

[0090] Two annular air chambers 608 are respectively disposed on two mounting ring frames 9, and multiple cleaning holes 613 are provided on each of the two annular air chambers 608.

[0091] Two gear rings 607 are respectively disposed on two annular air chambers 608;

[0092] Two mounting components 606 are respectively set on two mounting ring frames 9. Each mounting component 606 is provided with a mounting shaft 602. One end of each mounting shaft 602 is provided with a drive gear 603. The two drive gears 603 mesh with two gear rings 607 respectively.

[0093] In this invention, the welding alignment module 6 further includes:

[0094] A dual-axis motor 601 is mounted on the machining base 1. The two output shafts of the dual-axis motor 601 are connected to the other ends of two mounting shafts 602 respectively via couplings.

[0095] Multiple mounting brackets 605 are respectively mounted on two mounting ring frames 9. Each mounting bracket 605 is equipped with an electric push rod 609. Three mounting frames 604 are respectively mounted on the output end of the multiple electric push rods 609.

[0096] Two air pump bodies 612 are mounted on one of the fixed frames 604. Each air pump body 612 has an air filter chamber 611 at its output end. Each air filter chamber 611 has two connecting pipes 610 at its output end. The output ends of the four connecting pipes 610 are respectively connected to the interior of the two annular air chambers 608.

[0097] In this invention, the welding alignment module 6 further includes:

[0098] Multiple mounting rods 615 are respectively set on three fixed frames 604, and multiple alignment rollers 616 are respectively set on multiple mounting rods 615;

[0099] Multiple servo motors 614 are respectively mounted on three fixed frames 604, and the output shafts of the multiple servo motors 614 are respectively connected to one end of multiple mounting rods 615 through couplings.

[0100] Specifically, during use, when the steel pipe passes through the mounting ring frame 9, the air pump body 612 operates, and the air pump body 612 delivers air to the air filter chamber 611 for filtration. Then, the clean gas enters the annular air chamber 608 through the connecting pipe 610 and is sprayed out through the cleaning hole 613 for cleaning. At the same time, during cleaning, the dual-shaft motor 601 reciprocates to further drive the mounting shaft 602 and the drive gear 603 to reciprocate. Since the drive gear 603 meshes with the gear ring 607, the annular air chamber 608 reciprocates until cleaning is completed.

[0101] Before the steel pipe is welded, the electric push rod 609 is operated. The electric push rod 609 drives the fixed frame 604 to move towards the steel pipe side until the electric push rod 609 drives the alignment pressure roller 616 on the fixed frame 604 to contact the outer wall of the steel pipe, so as to squeeze and limit the alignment of the outer walls of the two steel pipes.

[0102] During the welding process, the servo motor 614 runs, which can drive multiple mounting rods 615 and alignment rollers 616 to rotate. In turn, the rotation of the alignment rollers 616 causes the steel pipe to rotate, thereby changing the welding position of the steel pipe until the welding process is completed.

[0103] In specific application scenarios, the welding alignment module 6 is suitable for the welding alignment process of steel pipe processing. That is, when welding, the welding alignment module 6 can squeeze and limit the position of the steel pipe through three fixed frames 604 and multiple alignment pressure rollers 616, so that the steel pipe is located on the central axis of the three fixed frames 604. This ensures that the ends of the steel pipes are aligned during welding, avoiding deviations and further improving the welding quality of the device. At the same time, before alignment, the device can clean dust and other impurities on the surface of the steel pipe through the annular air chamber 608 and cleaning hole 613 to ensure that the extrusion is not caused by dust and other impurities.

[0104] It should be noted that during cleaning, the air filter chamber 611 can filter the air to ensure that the cleaning gas is in a clean state and avoid secondary pollution to the surface of the steel pipe.

[0105] During the welding process, the servo motor 614 enables the alignment roller 616 to rotate, thereby causing the steel pipe to rotate so as to facilitate continuous welding.

[0106] A plasma arc welding method based on steel pipe processing, using a plasma arc welding equipment based on steel pipe processing as described above, includes the following steps:

[0107] Step 1: Place the steel pipe on the conveying guide rollers 3 on both sides and convey it into the two mounting ring frames 9. At the same time, when the steel pipe passes through the mounting ring frames 9, the air pump body 612 runs and delivers air into the air filter chamber 611 for filtration. Then, the clean gas enters the annular air chamber 608 through the connecting pipe 610 and is sprayed out through the cleaning hole 613 for cleaning. At the same time, during cleaning, the dual-shaft motor 601 reciprocates to further drive the mounting shaft 602 and the drive gear 603 to reciprocate. Since the drive gear 603 meshes with the gear ring 607, the annular air chamber 608 reciprocates until the welded ends of the two steel pipes contact.

[0108] Step 2: Before welding the steel pipe, the electric push rod 609 is operated. The electric push rod 609 drives the fixed frame 604 to move towards the steel pipe side until the electric push rod 609 drives the alignment pressure roller 616 on the fixed frame 604 to contact the outer wall of the steel pipe, so as to squeeze and limit the alignment of the outer walls of the two steel pipes.

[0109] Step 3: During welding, the stepper motor 501 operates, driving the linear lead screw 507 to rotate. This, in turn, causes the movable base block 508 to move on the linear guide rail 502. The movable base block 508, along with the connecting frame 504, moves the welding torch body 505 to the welding position for welding. Simultaneously, the contact frame 506 contacts the surface of the steel pipe. At this time, the drive motor 525 operates, driving the linkage wheel 524 to rotate. This, in turn, causes one of the shaft members 519 and the adjusting guide member 518 to rotate, adjusting the airflow angle. Simultaneously, the linkage wheel 524, in conjunction with the transmission belt 523 and the transmission wheel 522, can... The driving gear 521 rotates, and since the driving gear 521 meshes with the driven gear 520, the driven gear 520 can drive another shaft 519 and the adjusting guide 518 to rotate synchronously, so as to adjust to a suitable angle according to the size of the steel pipe. Then, as the weld pool is generated, the delivery pump 512 runs. The delivery pump 512 delivers the inert gas inside the guide gas cylinder 503 through the delivery pipe 513 to the fixed guide 516, and further delivers it through the elastic hose 515 and the connecting pipe 517 to the two adjusting guides 518 and the fixed guide 514, and sprays the gas at a certain angle to guide and blow the molten metal in the weld pool until the welding is completed.

[0110] Step 4: During the welding process, the servo motor 614 runs, which drives multiple mounting rods 615 and alignment rollers 616 to rotate. The rotation of the alignment rollers 616 causes the steel pipe to rotate, thereby changing the welding position of the steel pipe until the welding process is completed.

[0111] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A plasma arc welding device based on steel pipe processing, characterized in that, include: A processing base (1) is provided with two guide roller frames (2), and multiple fasteners (8) are provided on the two guide roller frames (2). Multiple spring supports (7) are respectively set on multiple fixing parts (8), and the same conveying guide roller (3) is set on each two spring supports (7). Mounting bracket (4) is set on processing base (1), and the processing base (1) is provided with two mounting ring frames (9). Molten pool guiding unit (5) is mounted on mounting bracket (4). The molten pool guiding unit (5) includes two adjusting guiding components (518), a first fixed guiding component (514) and a second fixed guiding component (516). Welding alignment module (6) is set on two mounting ring frames (9). The welding alignment module (6) includes multiple alignment pressure rollers (616) and three fixing frames (604). The molten pool guiding unit (5) also includes: Linear guide (502) is mounted on mounting bracket (4). A linear lead screw (507) is mounted on the linear guide (502). The linear lead screw (507) and the linear guide (502) are mounted on the same movable base block (508). A stepper motor (501) is mounted on a linear guide rail (502), and the output shaft of the stepper motor (501) is connected to one end of a linear lead screw (507) via a coupling. A connecting frame (504) is provided on the movable base block (508), and the connecting frame (504) has four mounting ports. The molten pool guiding unit (5) also includes: Four guide rods (510) are respectively set inside the four mounting ports. One end of each of the four guide rods (510) is provided with the same abutment frame (506). The second fixed guide member (516) is set on the abutment frame (506). Four telescopic springs (511) are respectively disposed on the outside of four guide rods (510). One end of each of the four telescopic springs (511) is fixedly connected to the outer wall of the connecting frame (504), and the other end of each of the four telescopic springs (511) is fixedly connected to the outer wall of the abutment frame (506). The molten pool guiding unit (5) also includes: The welding torch body (505) is mounted on the connecting frame (504) and is positioned between four guide rods (510). Three shaft members (519) are provided on the abutment frame (506). Two adjustment guides (518) are respectively provided at one end of two of the shaft members (519). The other end of the two shaft members (519) is respectively provided with a linkage wheel (524) and a driven gear (520). The driving gear (521) is located at one end of another shaft member (519) and meshes with the driven gear (520).

2. The plasma arc welding equipment based on steel pipe processing according to claim 1, characterized in that, The molten pool guiding unit (5) also includes: The transmission wheel (522) is mounted on the drive gear (521), and the transmission wheel (522) and the linkage wheel (524) are provided with the same transmission belt (523). An active motor (525) is mounted on an abutment frame (506), and the output shaft of the active motor (525) is connected to the outer wall of the linkage wheel (524) via a coupling. Two flexible hoses (515) are provided on the fixed guide member (516), and one end of the two driving flexible hoses (515) is connected to the inside of the two adjusting guide members (518).

3. The plasma arc welding equipment based on steel pipe processing according to claim 2, characterized in that, The molten pool guiding unit (5) also includes: Two connecting pipes (517) are provided on the fixed guide member two (516), and the fixed guide member one (514) is provided on one end of the two connecting pipes (517); A delivery pump (512) is mounted on a connecting frame (504). The input end of the delivery pump (512) is provided with a threaded connector (509), and a guide gas cylinder (503) is mounted on the threaded connector (509). The conveying pipe (513) is located at the output end of the conveying pump (512), and the output end of the conveying pipe (513) is connected to the interior of the fixed guide member (516).

4. The plasma arc welding equipment based on steel pipe processing according to claim 3, characterized in that, The welding alignment module (6) also includes: Two annular air chambers (608) are respectively disposed on two mounting ring frames (9), and multiple cleaning holes (613) are provided on each of the two annular air chambers (608). Two gear rings (607) are respectively disposed on two annular air chambers (608); Two mounting components (606) are respectively mounted on two mounting ring frames (9). Each of the two mounting components (606) is provided with a mounting shaft (602). One end of each of the two mounting shafts (602) is provided with a drive gear (603). The two drive gears (603) mesh with the two gear rings (607) respectively.

5. The plasma arc welding equipment based on steel pipe processing according to claim 4, characterized in that, The welding alignment module (6) also includes: A dual-axis motor (601) is mounted on a machining base (1). The two output shafts of the dual-axis motor (601) are connected to the other ends of two mounting shafts (602) respectively via couplings. Multiple mounting brackets (605) are respectively mounted on two mounting ring frames (9), and each of the multiple mounting brackets (605) is equipped with an electric push rod (609). Three mounting frames (604) are respectively mounted on the output end of the multiple electric push rods (609). Two air pump bodies (612) are mounted on one of the fixed frames (604). Each of the two air pump bodies (612) has an air filter chamber (611) at its output end. Each of the two air filter chambers (611) has two connecting pipes (610) at its output end. The output ends of the four connecting pipes (610) are respectively connected to the interior of the two annular air chambers (608).

6. The plasma arc welding equipment based on steel pipe processing according to claim 5, characterized in that, The welding alignment module (6) also includes: Multiple mounting rods (615) are respectively mounted on three fixed frames (604), and multiple alignment rollers (616) are respectively mounted on multiple mounting rods (615); Multiple servo motors (614) are respectively mounted on three fixed frames (604), and the output shafts of the multiple servo motors (614) are respectively connected to one end of multiple mounting rods (615) through couplings.

7. A plasma arc welding method based on steel pipe processing, using a plasma arc welding device based on steel pipe processing as described in claim 6, characterized in that, Includes the following steps: Step 1: Place the steel pipe on the conveying guide rollers (3) on both sides and convey it to the inside of the two mounting ring frames (9). At the same time, the welding alignment module (6) runs to clean its outer wall until the welding ends of the two steel pipes contact each other. Step 2: Before welding the steel pipes, the welding alignment module (6) is run again to squeeze and align the outer walls of the two steel pipes. Step 3: During welding, the molten pool guiding unit (5) operates so that the welding torch body (505) moves to the welding position and performs welding and molten metal guiding. Step 4: During the welding process, the welding alignment module (6) operates synchronously, causing the steel pipe to rotate until the welding process is completed.

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