A submerged arc welding device for corner seams

Abstract

This invention relates to a submerged arc welding device for corner seams, comprising a support platform, an arc welding machine, and a processing table. The processing table is positioned above the support platform, and the arc welding machine is placed on the side of the support platform. A linkage module is configured below the processing table, and multiple variable modules are configured on the side of the processing table facing the linkage module. A long slot is pre-drilled on the processing table, and a frustum of metal extends and retracts through this slot. A cylinder is connected to the back of the frustum, and a U-frame is connected to the part of the cylinder facing the workpiece. A limiting module is installed along the inner edge of the U-frame, and a compensation module is configured on the back of the U-frame. This submerged arc welding device for corner seams utilizes the rotational design of the variable modules. The limiting module rotates by 1 / 12 of an angle after each operation, changing the contact point with the workpiece, evenly distributing the contact, and extending the service life.

Description

Technical Field

[0001] This invention belongs to the field of submerged arc welding technology for corner seams, specifically a submerged arc welding device for corner seams. Background Technology

[0002] Submerged arc welding of corner seams is a welding technology widely used in the field of metal processing, especially in the manufacturing of pressure vessels and pipelines, for joining workpieces with corner seam structures. Traditional submerged arc welding equipment typically includes a support platform, an arc welding machine, and a processing table. During submerged arc welding of corner seams, the workpiece is prone to displacement due to the influence of welding fixtures, which affects the welding accuracy and quality.

[0003] In view of this, a submerged arc welding device for corner seams is proposed. Summary of the Invention

[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0005] Given the following technical problems in the existing technology: during submerged arc welding of corner seams, the workpiece is prone to displacement during the welding process due to the influence of welding fixtures, which affects the welding accuracy and quality.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a submerged arc welding device for corner seams, comprising a support platform, an arc welding machine, and a processing table;

[0007] The processing table is installed above the support platform, and the arc welding machine is placed on the side of the support platform;

[0008] A linkage module is configured below the processing table, and multiple variable modules are configured on the side of the processing table facing the linkage module.

[0009] The processing table has a pre-reserved elongated hole, on which a truncated cone is telescopically movable. A cylinder is connected to the back of the truncated cone, and a U-frame is connected to the part of the cylinder facing the workpiece. A limiting module is installed on the inner edge of the U-frame, and a compensation module is configured on the back of the U-frame.

[0010] The variable module includes a linkage plate, a fixed seat, a second rotary column, and a fixed stop. The fixed stop is located on one side of the processing table, and a linkage pad is installed on one side of the fixed stop. The linkage pad is milled with continuous toothed grooves. The second rotary column is rotatably connected to the truncated cone and the cylinder. A stabilizing module is arranged on the inner edge of the truncated cone. The second rotary column is docked with a limiting module. Another part of the limiting module is docked with a third rotary column. The part of the third rotary column extending out of the U-frame is docked with a rotary seat. The third rotary column and the rotary seat are rotatably connected. A movement space is milled in the second rotary column. A first guide pad is telescopically moved in the movement space. A first folding cylinder is connected to the back of the first guide pad. An elastic element is surrounded by the first folding cylinder. The two extreme ends of the first elastic element are connected to the back of the first guide pad and the inner edge of the movement space, respectively.

[0011] As a preferred technical solution for a submerged arc welding device for corner seams, the linkage module includes an inner hollow seat, a guide pad three, and an external threaded column. The inner hollow seat is fixed to the center of one side of the processing table. The guide pad three is movably configured in the inner hollow seat. The external threaded column is configured on the inner edge of the inner hollow seat. The external threaded column is externally threaded to a pair of internal threaded seats. When the internal threaded seats are rotated, a linkage arm two is configured. The other part of the linkage arm two is rotatedly connected to the back of the guide pad three.

[0012] As a preferred technical solution for a submerged arc welding device for corner seams, a first umbrella plate is arranged at the middle section of the external threaded column, a motor is installed on the inner edge of the inner hollow seat, the moving part of the motor is connected to a second umbrella plate, the outer contours of both the first and second umbrella plates are milled with grooves, the first umbrella plate and the second umbrella plate engage, and the outer contour of the guide pad is fixedly connected with multiple extension arms.

[0013] As a preferred technical solution for a submerged arc welding device for corner seams, the edge of the truncated cone is connected to an L-arm, a first linkage arm is rotatably connected to the L-arm, another part of the first linkage arm is rotatably connected to an extension arm, and a second elongated hole is reserved on the inner hollow seat, through which the extension arm extends and retracts.

[0014] As a preferred technical solution for a submerged arc welding device for corner seams, a rotating column is installed on one side of the guide pad that is offset from the folding cylinder. A linkage disc is installed at the part of the rotating column that extends out of the rotating column. The rotating column and the rotating column are connected by a spline. The outer contour of the linkage disc is milled with a groove. The linkage disc engages with the linkage pad. A fixed seat is installed outside the rotating column. The rotating column can rotate in the fixed seat.

[0015] As a preferred technical solution for a submerged arc welding device for corner seams, the back of the fixed seat is connected to a folding cylinder II, another part of the folding cylinder II is connected to a frustum, the fixed seat has a guide pad II that moves telescopically, one side of the guide pad II is fixedly connected to a linkage column that passes through the fixed seat, the other side of the guide pad II is connected to an elastic element II, and the fixed stop has a reserved linkage groove.

[0016] As a preferred technical solution for a submerged arc welding device for corner seams, the stabilizing module includes a fixed ring and a moving ring. The fixed ring is disposed on the inner edge of a frustum, and a wedge block is installed on the inner edge of the fixed ring. The moving ring is clamped to a rotating column. A notch is milled on the outer contour of the moving ring, and a positioning frame is rotatably disposed in the notch. An elastic element is installed at the middle position between the back of the positioning frame and the notch.

[0017] As a preferred technical solution for a submerged arc welding device for corner seams, the compensation module includes a guide frame, an adapter frame, and a support arm. The support arm is disposed on the back of the U-frame, the guide frame is disposed on the U-frame, the adapter frame extends and retracts outside the guide frame, an L-post is disposed on one side of the adapter frame, the other part of the L-post is connected to the rotary seat, and a support plate is installed on the side of the adapter frame that is offset from the L-post.

[0018] As a preferred technical solution for a submerged arc welding device for corner seams, the support arm is rotatably equipped with a movable seat, one end of the movable seat is provided with a cylinder, the cylinder is movably located in the support plate, the back of the support arm is provided with a movable frame, the movable frame is rotatably equipped with an electric telescopic device, and the movable part of the electric telescopic device is screwed to the part of the movable seat that is offset from the cylinder.

[0019] As a preferred technical solution for a submerged arc welding device for corner seams, the limiting module includes a first half-cylinder, an elastic ring, and a second half-cylinder. The second half-cylinder is connected to a second rotating column, and the first half-cylinder is connected to a third rotating column. The elastic ring is installed in the middle position between the first half-cylinder and the second half-cylinder. The first half-cylinder and the second half-cylinder are jointly provided with a folded cylinder. The first half-cylinder and the second half-cylinder have flexible plasticity.

[0020] The beneficial effects of this invention are:

[0021] 1. This submerged arc welding device for corner seams can accurately wrap and restrict the outer contour of the workpiece through the synchronous movement of the linkage module and multiple limiting modules, ensuring the stability of the workpiece during the arc welding process and improving the welding accuracy.

[0022] 2. This submerged arc welding device for corner seams uses a rotating design of the variable module to limit the module to rotate 1 / 12 of an angle after each operation, changing the contact point with the workpiece, distributing the contact evenly, and extending its service life.

[0023] 3. The compensation module can compensate or release force according to the workpiece requirements through the movement of the electric telescoping device and the adapter frame, optimize the stress state during the arc welding process, and adapt to workpieces with uneven surfaces, avoid hard contact, protect the workpiece surface, and improve welding applicability.

[0024] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the description and the drawings. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0026] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0027] Figure 2 This is a schematic diagram of the processing table of the present invention.

[0028] Figure 3 This is a cross-sectional schematic diagram of the linkage module of the present invention.

[0029] Figure 4 This is a schematic diagram of the second gyratory column of the present invention.

[0030] Figure 5 This is a schematic diagram of the positioning of the present invention.

[0031] Figure 6 This is a schematic diagram of the fixed ring of the present invention.

[0032] Figure 7 This is a schematic diagram of the U-shaped frame of the present invention.

[0033] Figure 8 This is a schematic diagram of the compensation module of the present invention.

[0034] Figure 9 This is a schematic diagram of the defined modules of the present invention.

[0035] Figure 10 Based on the present invention Figure 3 Schematic diagram at point X in the middle.

[0036] Figure 11 Based on the present invention Figure 4 Schematic diagram at point Y in the middle.

[0037] Figure 12 Based on the present invention Figure 6 Schematic diagram at point Z in the middle.

[0038] Figure label:

[0039] 10. Support platform; 20. Arc welding machine; 30. Machining table; 40. Variable module; 41. Linkage plate; 42. Fixed seat; 43. Rotating column one; 44. Motion space; 45. Guide pad one; 46. Folding cylinder one; 47. Elastic element one; 48. Rotating column two; 49. Fixed stop; 50. Linkage pad; 51. Linkage groove; 52. Linkage column; 53. Guide pad two; 54. Elastic element two; 55. Rotating column three; 56. Rotating seat; 57. Folding cylinder two; 60. Linkage module; 61. Frustum; 62. Cylinder; 63. L-arm; 64. Linkage arm one; 65. Inner hollow seat; 66. Extension arm; 67. Long slot one; 68. 69. Long strip hole 2; 70. Guide pad 3; 71. Linkage arm 2; 72. Motor; 73. Internal thread seat; 74. External thread post; 75. Umbrella disc 1; 76. Umbrella disc 2; 87. Compensation module; 88. L-post; 89. Guide frame; 80. Adapter frame; 81. Cylindrical; 80. Bearing plate; 81. Movable seat; 82. Bearing arm; 83. Electric telescopic device; 84. Movable frame; 95. Stabilizing module; 96. Fixed ring; 97. Moving ring; 98. Positioning frame; 99. Notch; 100. Elastic element 3; 101. Limiting module; 102. Half cylinder 1; 103. Elastic ring; 104. Half cylinder 2; 105. Folding cylinder 3. Detailed Implementation

[0040] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0041] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0042] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places throughout this specification does not necessarily refer to the same embodiment, nor is it a single embodiment or an embodiment selectively excluded from other embodiments.

[0043] Secondly, the present invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In addition, actual fabrication should include three-dimensional spatial dimensions of length, width, and depth.

[0044] Example, refer to Figure 1 and 2 A submerged arc welding device for corner seams includes a support platform 10, an arc welding machine 20, and a processing table 30.

[0045] The processing table 30 is installed above the support table 10, and the arc welding machine 20 is placed on the side of the support table 10.

[0046] A linkage module 60 is arranged below the processing table 30, and multiple variable modules 40 are arranged on the side of the processing table 30 facing the linkage module 60.

[0047] Reference Figure 3 , 4 7 and 10, the linkage module 60 includes an inner seat 65, a guide pad 3 69, and an external threaded post 73. The inner seat 65 is fixed to the center of one side of the machining table 30. The guide pad 3 69 is movably configured in the inner seat 65. The external threaded post 73 is configured on the inner edge of the inner seat 65. The external threaded post 73 is externally threaded to a pair of internal threaded seats 72. When the internal threaded seats 72 rotate, a linkage arm 2 70 is configured. The other part of the linkage arm 2 70 is rotatably connected to the back of the guide pad 3 69. A parasol plate 1 74 is configured in the middle of the external threaded post 73. A motor 71 is installed on the inner edge of the inner seat 65. The movable part of the motor 71 is mated to the parasol plate 2 75. The outer contours of both the parasol plate 1 74 and the parasol plate 2 75 are milled with grooves. 4. Engages with umbrella disc 2 75. Multiple extension arms 66 are fixedly connected to the outer contour of guide pad 3 69. A long hole 1 67 is reserved on the processing table 30. A frustum 61 is telescopically moved on the long hole 1 67. A cylinder 62 is connected to the back of the frustum 61. The long hole 1 67 allows the cylinder 62 to move radially. A U-frame 76 is connected to the part of the cylinder 62 facing the workpiece. A limiting module 100 is installed on the inner edge of the U-frame 76. A compensation module 80 is configured on the back of the U-frame 76. An L-arm 63 is connected to the edge of the frustum 61. A linkage arm 1 64 is rotatably connected to the L-arm 63. Another part of the linkage arm 1 64 is rotatably connected to the extension arm 66. A long hole 2 68 is reserved on the inner seat 65. The extension arm 66 telescopically moves in the long hole 2 68.

[0048] Multiple limiting modules 100 move synchronously to wrap and restrict the outer contour of the workpiece, and the workpiece is arc welded by the arc welding machine 20.

[0049] Reference Figure 4 ,5 7 and 11, the variable module 40 includes a linkage disk 41, a fixed seat 42, a second rotary column 48, and a fixed stop 49. The fixed stop 49 is disposed on one side of the processing table 30. A linkage pad 50 is installed on one side of the fixed stop 49. The linkage pad 50 is milled with continuous toothed grooves. The second rotary column 48 is rotatably connected to the frustum 61 and the cylinder 62. A stabilizing module 90 is disposed on the inner edge of the frustum 61. The second rotary column 48 is docked with the limiting module 100. Another part of the limiting module 100 is docked with the third rotary column 55. The part of the third rotary column 55 that extends out of the U-frame 76 is docked with the rotary seat 56. The third rotary column 55 and the rotary seat 56 are rotatably connected. A motion space 44 is milled in the second rotary column 48. A guide pad 45 is telescopically moved in the motion space 44. A folding cylinder 46 is connected to the back of the guide pad 45. An elastic element 47 surrounds the folding cylinder 46. The two extreme ends of component 47 are connected to the back of guide pad 45 and the inner edge of movement space 44, respectively. A rotary column 43 is installed on the side of guide pad 45 that is away from folding cylinder 46. A linkage plate 41 is installed on the part of rotary column 43 that extends out of rotary column 48. Rotary column 43 and rotary column 48 are connected by a spline. The outer contour of linkage plate 41 is milled with a toothed groove. Linkage plate 41 engages with linkage pad 50. A fixed seat 42 is installed outside rotary column 43. Rotary column 43 can rotate in fixed seat 42. Folding cylinder 57 is connected to the back of fixed seat 42. The other part of folding cylinder 57 is connected to frustum 61. Guide pad 53 is telescopically moved in fixed seat 42. A linkage column 52 that penetrates fixed seat 42 is fixed to one side of guide pad 53. Elastic component 54 is connected to the other side of guide pad 53. Linkage groove 51 is reserved on fixed stop 49.

[0050] The linkage channel 51 includes a horizontal section and a slope section, with the slope edge having a chamfered edge. Before contacting the workpiece, the linkage column 52 is in the linkage channel 51, and the elastic element 54 is pressed. When wrapping and restricting the workpiece, the linkage module 60 causes the linkage column 52 to extend and retract within the linkage channel 51. Under the action of the chamfered slope edge, it moves out of the linkage channel 51 and restricts the workpiece through misalignment. At this time, the position of the linkage disc 41 can change by the folding cylinder 46 and the elastic element 47. After the arc welding is completed, the limiting module 100 returns to its initial position, the linkage disc 41 engages with the linkage pad 50, and the linkage disc 41 rotates. The rotating column 43 and the rotating column 48 rotate synchronously at this time. The rotating column 48 moves together with the limiting module 100. The movement amplitude of the limiting module 100 in a single movement is 1 / 12. At this time, the contact point between the limiting module 100 and the workpiece can be changed, improving the service life of the limiting module 100.

[0051] Reference Figure 4 , 6And 12, the stabilizing module 90 includes a fixed ring 91 and a moving ring 92. The fixed ring 91 is disposed on the inner edge of the frustum 61. A wedge block is installed on the inner edge of the fixed ring 91. The moving ring 92 is clamped to the rotating column 48. A notch 94 is milled on the outer contour of the moving ring 92. A positioning frame 93 is rotatably disposed in the notch 94. An elastic element 95 is installed at the middle position between the back of the positioning frame 93 and the notch 94.

[0052] When the rotating column 48 rotates, the moving ring 92 moves along with it. The wedge block on the inner edge of the positioning frame 93 and the fixed ring 91 cooperates to allow the moving ring 92 to move in one direction. When the rotating column 48 stops moving, the cooperation between the positioning frame 93 and the wedge block limits the state of the rotating column 48.

[0053] Reference Figure 7 and 8 The compensation module 80 includes a guide frame 82, an adapter frame 83, and a support arm 87. The support arm 87 is disposed on the back of the U-frame 76, the guide frame 82 is disposed on the U-frame 76, the adapter frame 83 is telescopically movable outside the guide frame 82, one side of the adapter frame 83 is provided with an L-post 81, the other part of the L-post 81 is connected to the rotary seat 56, the side of the adapter frame 83 that is off from the L-post 81 is provided with a support plate 85, the support arm 87 is rotatably disposed with a movable seat 86, one end of the movable seat 86 is provided with a cylinder 84, the cylinder 84 is movably located in the support plate 85, the back of the support arm 87 is provided with a movable frame 89, the movable frame 89 is rotatably disposed with an electric telescopic device 88, the movable part of the electric telescopic device 88 is screwed to the part of the movable seat 86 that is off from the cylinder 84;

[0054] At this moment, the limited module 100 can be deformed under pressure, thereby adapting to workpieces with uneven surfaces.

[0055] Reference Figures 1 to 3 The limiting module 100 includes a first half-cylinder 101, an elastic ring 102, and a second half-cylinder 103. The second half-cylinder 103 is connected to the second rotary column 48, and the first half-cylinder 101 is connected to the third rotary column 55. The elastic ring 102 is installed in the middle position between the first half-cylinder 101 and the second half-cylinder 103. The first half-cylinder 101 and the second half-cylinder 103 are both equipped with a folding cylinder 104. The folding cylinder 104 is equipped with an elastic element. The first half-cylinder 101 and the second half-cylinder 103 have flexible plasticity.

[0056] When semi-cylinder 101 and semi-cylinder 2103 come into contact with the workpiece, they can avoid direct hard contact with the workpiece surface.

[0057] The above can achieve the following: The linkage column 52 is initially positioned within the linkage channel 51. After the workpiece position aligns with the processing table 30, the motor 71 links the umbrella disc 2 75, which in turn links the umbrella disc 1 74 and the external thread column 73. The external thread column 73 links the internal thread seat 72, and under the action of the linkage arm 2 70, the guide pad 3 69 and the extension arm 66 can move up and down. The extension arm 66 moves within the elongated hole 1 67 via the linkage arm 1 64, linking the L-arm 63, the frustum 61, and the cylinder 62. The U-frame 76 moves along with the cylinder 62, moving the limiting module 100 towards the workpiece position. At the appropriate position, the linkage column 52 disengages from the linkage channel 51. At this moment, with the assistance of the folding cylinder 2 57, the folding cylinder 1 46, and the elastic element 1 47, the linkage disc 41... The fixed seat 42 can move up and down. The linkage plate 41 moves to a position where it is level with the height of the linkage pad 50. The elastic element 2 54 acts to make the linkage column 52 contact with the fixed stop 49. After wrapping and restricting the workpiece, arc welding is performed. After the arc welding is completed, the linkage module 60 operates in reverse. The round table 61 links the rotating column 2 48 to link the linkage plate 41. Since the linkage plate 41 is level with the linkage pad 50 at this time, when the position of the linkage plate 41 changes, the linkage plate 41 will engage with the linkage pad 50. At this time, the linkage plate 41 will be linked to rotate. The linkage plate 41 links the rotating column 1 43 and the rotating column 2 48 to rotate together. The rotating column 2 48 links the limiting module 100 to rotate. At this time, the side of the limiting module 100 facing the workpiece will rotate by 1 / 12 of the overall angle.

[0058] When the rotating column 48 rotates, the moving ring 92 moves accordingly. The moving ring 92, in conjunction with the positioning frame 93, rotates around the inner edge of the fixed ring 91. When the linkage disc 41 and the linkage pad 50 are at the same height and do not engage, the elastic element 95 can push the positioning frame 93 between two adjacent wedge blocks, thus limiting the state of the rotating column 48. When the linkage column 52 moves to the slope of the linkage channel 51 with a larger gap, the linkage column 52 enters the linkage channel 51 under the action of the elastic element 54. At this moment, the operation of the single-time limiting module 100 is completed.

[0059] When dealing with workpieces with uneven surfaces or when wrapping and restricting workpieces, the electric telescopic device 88 rotates in conjunction with the movable seat 86, and the cylinder 84 acts on the bearing plate 85. At this time, the adapter frame 83 can move up and down along the guide frame 82. The L-column 81 is linked with the rotary seat 56 and the rotary column 55. Under the action of the elastic ring 102 and the folding cylinder 104, the half-cylinder 101 and half-cylinder 203 can move in a concave or convex manner. This process can be set to unidirectional control according to actual needs to achieve concave or convex movements. It can be used for workpieces with uneven surfaces. At the same time, it can also compensate or release forces after wrapping and restricting workpieces to meet the accuracy requirements of arc welding and protect the workpiece.

[0060] It should be understood that numerous specific implementation decisions can be made during the development of any actual implementation method, and in any engineering or design project. Such development efforts may be complex and time-consuming, but for those of ordinary skill in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0061] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A submerged arc welding device for corner seams, characterized in that: Includes a support platform, an arc welding machine, and a processing table; The processing table is installed above the support platform, and the arc welding machine is placed on the side of the support platform; A linkage module is configured below the processing table, and multiple variable modules are configured on the side of the processing table facing the linkage module. The processing table has a pre-reserved elongated hole, on which a truncated cone is telescopically movable. A cylinder is connected to the back of the truncated cone, and a U-frame is connected to the part of the cylinder facing the workpiece. A limiting module is installed on the inner edge of the U-frame, and a compensation module is configured on the back of the U-frame. The compensation module, through the movement of the electric telescoping device and the adapter frame, enables the limiting module to deform under pressure. It can compensate or release force according to the workpiece requirements, optimize the stress state during the arc welding process, and adapt to workpieces with uneven surfaces, avoid hard contact, protect the workpiece surface, and improve welding applicability. The linkage module includes an inner hollow seat, a guide pad three, and an external threaded post. The inner hollow seat is fixed to the center of one side of the processing table. The guide pad three is movably configured in the inner hollow seat. The external threaded post is configured on the inner edge of the inner hollow seat. The external threaded post is externally threaded to a pair of internal threaded seats. When the internal threaded seats are rotated, a linkage arm two is configured. The other part of the linkage arm two is rotatably connected to the back of the guide pad three. The middle section of the external threaded column is provided with umbrella disk one, the inner edge of the inner seat is provided with a motor, the moving part of the motor is connected to umbrella disk two, the outer contours of umbrella disk one and umbrella disk two are milled with tooth grooves, umbrella disk one and umbrella disk two are engaged, and the outer contour of the guide pad three is fixedly connected with multiple extension arms. The edge of the truncated cone is connected to an L-arm, and a first linkage arm is rotatably connected to the L-arm. Another part of the first linkage arm is rotatably connected to an extension arm. A second elongated hole is reserved on the inner hollow seat, and the extension arm moves in and out of the second elongated hole. The variable module includes a linkage plate, a fixed seat, a second rotary column, and a fixed stop. The fixed stop is located on one side of the processing table, and a linkage pad is installed on one side of the fixed stop. The linkage pad is milled with a continuous toothed groove. The second rotary column is rotatably connected to the truncated cone and the cylinder. A stabilizing module is arranged on the inner edge of the truncated cone. The second rotary column is docked with a limiting module. Another part of the limiting module is docked with a third rotary column. The part of the third rotary column extending out of the U-frame is docked with a rotary seat. The third rotary column and the rotary seat are rotatably connected. A movement space is milled in the second rotary column. A first guide pad is telescopically moved in the movement space. A first folding cylinder is connected to the back of the first guide pad. An elastic element is surrounded by the first folding cylinder. The two extreme ends of the first elastic element are connected to the back of the first guide pad and the inner edge of the movement space, respectively. The guide pad is offset from the folding cylinder and a rotary column is installed on one side. A linkage plate is installed at the part of the rotary column that extends out of the rotary column. The rotary column and the rotary column are connected by a spline. The outer contour of the linkage plate is milled with a toothed groove. The linkage plate engages with the linkage pad. A fixed seat is installed outside the rotary column. The rotary column can rotate in the fixed seat. The back of the fixed seat is connected to a folding cylinder two, and another part of the folding cylinder two is connected to a truncated cone. The fixed seat has a guide pad two that moves in a telescopic motion. One side of the guide pad two is fixedly connected to a linkage column that passes through the fixed seat, and the other side of the guide pad two is connected to an elastic element two. The fixed stop has a linkage groove reserved. The linkage channel includes a horizontal section and a slope section. The slope edge with a smaller distance is chamfered. Before contacting the workpiece, the linkage column is in the linkage channel, and the elastic element is pressed. When wrapping and restricting the workpiece, the linkage module makes the linkage column extend and retract in the linkage channel. Under the action of the chamfered slope edge, it moves out of the linkage channel and restricts the workpiece under the action of misalignment. At this time, the position of the linkage disc can be changed by the folding cylinder and the elastic element, and the linkage disc engages with the linkage pad. The stabilizing module includes a fixed ring and a moving ring. The fixed ring is disposed on the inner edge of the frustum. A wedge block is installed on the inner edge of the fixed ring. The moving ring is clamped to the second rotating column. A notch is milled on the outer contour of the moving ring. A positioning frame is rotatably disposed in the notch. An elastic element is installed at the middle position between the back of the positioning frame and the notch. The limiting module includes a first half-cylinder, an elastic ring, and a second half-cylinder. The second half-cylinder is connected to a second rotating column, and the first half-cylinder is connected to a third rotating column. The elastic ring is installed in the middle position between the first half-cylinder and the second half-cylinder. The first half-cylinder and the second half-cylinder are both equipped with a third folding cylinder.

2. The submerged arc welding device for corner seams according to claim 1, characterized in that: The compensation module includes a guide frame, an adapter frame, and a support arm. The support arm is disposed on the back of the U-frame, the guide frame is disposed on the U-frame, the adapter frame extends and retracts outside the guide frame, an L-post is disposed on one side of the adapter frame, the other part of the L-post is connected to the swivel seat, and a support plate is installed on the side of the adapter frame that is offset from the L-post.

3. The submerged arc welding device for corner seams according to claim 2, characterized in that: The support arm is rotatably equipped with a movable seat, one end of which is fitted with a cylinder. The cylinder is movably positioned within the support plate. A movable frame is mounted on the back of the support arm, and an electric telescopic device is rotatably equipped on the movable frame. The movable part of the electric telescopic device is screwed onto the part of the movable seat that is offset from the cylinder.

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