Automatic welding mechanism for pipeline circumferential welds

Abstract

The invention discloses a pipeline circumferential weld automatic welding mechanism which comprises a workbench, moving wheels are connected to the four corners of the bottom of the workbench, side protection plates are connected to the front portion and the rear portion of the top of the workbench, steering shafts are rotationally connected to the upper portions of the side protection plates, and an overturning shell is connected between the two steering shafts; an opening is formed in the upper end of the overturning shell, a center shaft is rotationally connected to the center of the inner wall of the overturning shell, a bearing seat is connected to the top of the center shaft, a plurality of stepped holes are formed in the top of the bearing seat in the circumferential direction, hollow pipes are rotationally connected to the lower portions of inner cavities of the stepped holes, and trays are connected to the upper portions of the outer walls of the hollow pipes. The left side of the top of the workbench is connected with a welding frame. The device is reasonable in structural design, solves the problems of inaccurate positioning, low efficiency, frequent manual intervention and the like in traditional annular welding seam welding, and is suitable for a pipeline flange batch welding scene.

Description

Technical Field

[0001] The invention relates to the technical field of welding mechanisms, and in particular to an automatic welding mechanism for a pipeline annular weld. Background Art

[0002] Welding, also known as fusion or melting, is a manufacturing process and technology that joins metals or other thermoplastic materials using heat, high temperature, or high pressure. To accommodate the welding of various products, a variety of welding equipment is required, tailored to the welding method. Pipeline assembly often involves welding flanges to pipe ends. The flange and pipe workpiece are clamped in a rotating fixture, creating a circular weld at the contact ends.

[0003] Those skilled in the art have conducted research and improved upon this, ultimately proposing a flange welding device, application number CN202321535509.7. This device uses an electrically operated telescopic rod to lower the welding torch, allowing it to engage the flange for welding. However, this solution cannot achieve continuous welding, requiring frequent manual loading and unloading of materials. Furthermore, it lacks effective positioning and clamping of the pipe workpiece, impacting weld quality. Therefore, we have proposed an automatic welding mechanism for pipe annular welds. Summary of the Invention

[0004] The purpose of the present invention is to provide an automatic welding mechanism for a pipe annular weld to overcome the technical problems existing in the prior art.

[0005] In order to achieve the above technical objectives and achieve the above technical effects, the present invention provides the following technical solutions:

[0006] A pipe annular weld automatic welding mechanism comprises a workbench, wherein the four corners of the bottom of the workbench are connected to moving wheels, the top of the workbench is connected to side guard plates at the front and rear, the upper parts of the side guard plates are rotatably connected to steering shafts, a flip shell is connected between the two steering shafts, the upper end of the flip shell is opened, the center of the inner wall of the flip shell is rotatably connected to the central shaft, the top of the central shaft is connected to a receiving seat, a plurality of stepped holes are circumferentially provided on the top of the receiving seat, the lower part of the inner cavity of the stepped hole is rotatably connected to a hollow tube, the upper part of the outer wall of the hollow tube is connected to a tray, the top left side of the workbench is connected to a welding frame, and the front end of the workbench is connected to a PLC controller.

[0007] Preferably, in an automatic welding mechanism for annular welds of a pipeline, the top of the hollow tube is connected to a cylindrical shell, three guide holes are circumferentially opened on the upper side wall of the cylindrical shell, a trapezoidal block is movably inserted in the guide hole, the end of the trapezoidal block extending out of the cylindrical shell is provided with a protrusion, a tension spring is connected between the protrusion and the outer wall of the cylindrical shell, the end of the trapezoidal block extending into the cylindrical shell is provided with a downwardly inclined inclined surface, a top column is passed through the hollow tube, the upper end of the top column abuts against the inclined surface of the trapezoidal block, and the lower end of the top column is embedded with a wear-resistant ball.

[0008] Preferably, in an automatic welding mechanism for annular welds of a pipeline, a plurality of vertical rods are movably connected to the bottom of the flip shell, a return spring is sleeved on the lower part of the vertical rod, the upper ends of the plurality of vertical rods are commonly connected to an annular plate, the annular plate is arranged coaxially with the central axis, the wear-resistant balls abut the upper surface of the annular plate, the lower ends of the plurality of vertical rods are commonly connected to a metal block, an electromagnet is embedded in the bottom center of the flip shell, the electromagnet is located directly above the metal block, a clearance opening is opened on the upper right end of the flip shell, the lower right end of the flip shell is connected to a drive motor, and the top output end of the drive motor is connected to a drive gear.

[0009] Preferably, in an automatic welding mechanism for annular welds of a pipeline, an annular tooth groove is opened in the middle of the outer wall of the socket, one end of the driving gear extends into the give way and is meshed with the annular tooth groove, the upper part of the outer wall of the socket is connected to a sealing ring, a transmission cavity is provided in the upper part of the socket, the transmission cavity is connected to the upper part of the stepped hole, the top center of the socket is connected to a motor frame, the top of the inner wall of the motor frame is connected to a steering motor, the bottom output end of the steering motor extends into the transmission cavity and is connected to the main gear, the outer wall of the tray is connected to a gear ring, and the gear ring is meshed with the main gear.

[0010] Preferably, in an automatic welding mechanism for annular welds of a pipeline, the top of the motor frame is connected to a stroke tube, the upper end of the stroke tube is connected to a hydraulic rod, the lower end of the hydraulic rod is connected to a lifting block, the outer side wall of the lifting block is hinged with multiple traction rods, the wall of the stroke tube is provided with a vertical groove for the traction rod to pass through, the lower end of the traction rod is hinged with a transverse rack, the top of the receiving seat is circumferentially connected to multiple transmission shells, a vertical shaft is rotatably connected in the transmission shell, the outer wall of the vertical shaft is connected to a large gear and a small gear up and down, and the end of the transverse rack extends into the transmission shell and meshes with the small gear.

[0011] Preferably, in an automatic welding mechanism for a pipe annular weld, the top of the stepped hole is connected to a limit plate in the front and rear, an L-shaped rod is movably inserted in the limit plate, and two L-shaped rods are symmetrically connected to an arc plate on one side close to each other, and the arc plate is provided with a plurality of rectangular openings along the length direction, and a guide roller is rotatably connected in the rectangular opening, and the transverse part of the L-shaped rod is connected to a longitudinal rack, the end of the longitudinal rack extends into the transmission housing and is meshed with a large gear, and the two longitudinal racks are arranged in a centrally symmetrical structure about the center of the large gear.

[0012] Preferably, in an automatic welding mechanism for a pipe annular weld, the inner wall of the welding frame is connected to an inclined platform, a limiting groove is provided on the top of the inclined platform, a screw rod is rotatably connected in the limiting groove, the lower end of the screw rod is connected to a screw motor, a nut seat is screwed on the outer wall of the screw rod, the top of the nut seat is connected to a linkage frame, a welding gun is installed at the lower part of the linkage frame, the angle between the axis of the screw rod and the horizontal plane is degrees, a vertical cylinder is connected to the top right side of the welding frame, a piston rod is connected to the bottom of the vertical cylinder, and a pressure block is rotatably connected to the lower end of the piston rod.

[0013] Preferably, in an automatic welding mechanism for a pipe annular weld, an infrared signal transmitter is connected to the left side of the bottom of the inner cavity of the flip shell, and a plurality of infrared signal receivers are circumferentially connected to the bottom of the receiving seat. When the infrared signal transmitter and the infrared signal receiver are aligned, the pressure block is arranged coaxially with the left stepped hole.

[0014] Preferably, in an automatic welding mechanism for a pipe annular weld, the outer wall of the side guard plate on the rear side is connected to a worm motor, the output end of the worm motor is connected to a worm, the end of the steering shaft on the rear side is connected to a worm wheel, the worm wheel is meshed with the worm, the unfolded spiral angle of the worm is smaller than the friction angle of contact between the worm wheel and worm, the end of the steering shaft on the front side is connected to a scale pointer, the outer wall of the side guard plate on the front side is provided with an angle scale matching the scale pointer, a unloading port is opened on the right side of the workbench, the lower end of the unloading port is provided with a material guide slope, and the top of the material guide slope is connected to a rubber pad.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The present invention has a reasonable structural design and can realize multi-station collaborative welding, thereby improving work efficiency. The rotatable socket is used in conjunction with the PLC controller for programmed operation, which can realize the station switching of the workpiece and facilitate the continuous completion of the annular welds of multiple flanges and pipes. The infrared signal alignment setting further ensures the accuracy of the welding station switching;

[0017] 2. The present invention can realize adaptive clamping of the workpiece, avoid shaking during welding, and help ensure welding quality. The electromagnet attracts the metal block to drive the top column to link the trapezoidal block to expand, realizing rapid locking of the flange center hole. The adjustable spacing between the two arc plates facilitates the flexible clamping of the guide roller to the pipe. After the pressure block is pressed down, it can abut the top of the pipe and rotate synchronously to ensure uniform formation of the weld.

[0018] 3. The welding gun of the present invention feeds obliquely, which can effectively contact the welding position of the workpiece. After the welding gun retracts, the flip shell can realize overturning and unloading through the worm gear mechanism, and the completed workpiece falls into the unloading port. The guide slope is equipped with a rubber pad, which takes into account both the convenience of unloading and the protection of the workpiece.

[0019] In summary, this device solves the problems of inaccurate positioning, low efficiency and frequent manual intervention in traditional annular welds through mechatronic design, and is suitable for batch welding scenarios of pipeline flanges. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solution of the present invention, the following is a brief introduction to the drawings required for use in the description of the specific implementation methods. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 The overall structure of the present invention is shown in FIG. Figure 1 ;

[0022] Figure 2 The overall structure of the present invention is shown in FIG. Figure 2 ;

[0023] Figure 3 Schematic diagram of the top view of the flip shell in the present invention;

[0024] Figure 4 Schematic diagram of the internal structure of the flip shell in the present invention;

[0025] Figure 5 for Figure 4 A partial enlarged schematic diagram of point A in the middle;

[0026] Figure 6 Schematic diagram of the position distribution of the trapezoidal blocks in the present invention;

[0027] Figure 7 Schematic diagram of the structure of the transmission cavity in the present invention;

[0028] Figure 8 Schematic diagram of the structure of the stroke tube in the present invention;

[0029] Figure 9Schematic diagram of the structure of the L-shaped rod in the present invention;

[0030] Figure 10 Schematic diagram of the structure of the transmission housing in the present invention;

[0031] Figure 11 Schematic diagram of the structure of the arc plate in the present invention;

[0032] Figure 12 It is a structural schematic diagram of the welding frame in the present invention;

[0033] Figure 13 Schematic diagram of the structure of the completed workpiece.

[0034] Figure: 1. Workbench; 2. Moving wheels; 3. Side guards; 4. Steering shaft; 5. Turning shell; 6. Center shaft; 7. Socket; 8. Stepped hole; 9. Hollow tube; 10. Pallet; 11. Welding rack; 12. PLC controller.

[0035] 31. Worm motor; 32. Worm; 41. Worm gear; 42. Scale pointer;

[0036] 51. Vertical rod; 52. Ring plate; 53. Metal block; 54. Electromagnet; 55. Yield opening; 56. Drive motor; 57. Drive gear; 58. Infrared signal transmitter; 59. Return spring;

[0037] 71. Annular tooth groove; 72. Sealing ring; 73. Transmission cavity; 74. Motor frame; 75. Steering motor; 76. Main gear; 77. Ring gear; 78. Transmission housing; 79. Infrared signal receiver;

[0038] 81. Limiting plate; 82. L-shaped rod; 83. Arc plate; 84. Rectangular opening; 85. Guide roller; 86. Longitudinal rack;

[0039] 91. Cylindrical shell; 92. Guide hole; 93. Trapezoidal block; 94. Extension spring; 95. Top column; 96. Wear-resistant ball;

[0040] 101. Discharge port; 102. Rubber pad;

[0041] 110. Pressing block; 111. Inclined platform; 112. Limiting groove; 113. Screw; 114. Screw motor; 115. Nut seat; 116. Linkage frame; 117. Welding gun; 118. Vertical cylinder; 119. Piston rod;

[0042] 741, stroke tube; 742, hydraulic rod; 743, lifting block; 744, traction rod; 745, vertical slot; 746, horizontal rack; 781, vertical shaft; 782, large gear; 783, small gear. DETAILED DESCRIPTION

[0043] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0044] Example 1

[0045] See also Figure 1-13 As shown, this embodiment is an automatic welding mechanism for a pipe annular weld, comprising a workbench 1, wherein the four corners of the bottom of the workbench 1 are connected to moving wheels 2, the top of the workbench 1 is connected to side guard plates 3 at the front and rear, the upper part of the side guard plates 3 is rotatably connected to a steering shaft 4, a flip shell 5 is connected between the two steering shafts 4, the upper end of the flip shell 5 is opened, the inner wall center of the flip shell 5 is rotatably connected to a central shaft 6, the top of the central shaft 6 is connected to a receiving seat 7, a plurality of stepped holes 8 are circumferentially opened on the top of the receiving seat 7, the lower part of the inner cavity of the stepped hole 8 is rotatably connected to a hollow tube 9, the upper part of the outer wall of the hollow tube 9 is connected to a tray 10, a welding frame 11 is connected to the left side of the top of the workbench 1, and a PLC controller 12 is connected to the front end of the workbench 1.

[0046] The top of the hollow tube 9 is connected to a cylindrical shell 91, and three guide holes 92 are circumferentially opened on the upper side wall of the cylindrical shell 91. A trapezoidal block 93 is movably inserted into the guide hole 92. The end of the trapezoidal block 93 extending out of the cylindrical shell 91 is provided with a protrusion, and a tension spring 94 is connected between the protrusion and the outer wall of the cylindrical shell 91. The end of the trapezoidal block 93 extending into the cylindrical shell 91 is provided with a downward inclined surface, and a top column 95 passes through the hollow tube 9, the upper end of the top column 95 abuts the inclined surface of the trapezoidal block 93, and the lower end of the top column 95 is embedded with a wear-resistant ball 96.

[0047] A plurality of vertical rods 51 are movably connected to the bottom of the flip shell 5, and a return spring 59 is sleeved on the lower part of the vertical rod 51. The upper ends of the plurality of vertical rods 51 are commonly connected to an annular plate 52, and the annular plate 52 is arranged coaxially with the central axis 6. The wear-resistant balls 96 abut the upper surface of the annular plate 52. The lower ends of the plurality of vertical rods 51 are commonly connected to a metal block 53. An electromagnet 54 is embedded in the bottom center of the flip shell 5. The electromagnet 54 is located directly above the metal block 53. A clearance opening 55 is opened at the upper right end of the flip shell 5. The lower right end of the flip shell 5 is connected to a drive motor 56, and the top output end of the drive motor 56 is connected to a drive gear 57.

[0048] The specific method of this embodiment is:

[0049] When the device is in use, an external power source is connected, multiple flanges are placed in each tray 10, and the joint pipe is placed on the top of the flange. The PLC controller 12 is used to control the operation of each electrical component. The socket 7 can rotate around the central axis 6, so that each tray 10 passes the right side of the welding frame 11 in turn. The welding frame 11 is used to weld the contact end of the joint pipe and the flange, thereby forming a circular weld.

[0050] When the flange is loaded, the center hole is sleeved on the outside of the cylindrical shell 91, and the electromagnet 54 is energized to attract the metal block 53, so that the vertical rod 51 drives the annular plate 52 to move upward, and the upper surface of the annular plate 52 abuts the wear-resistant ball 96, so that the top column 95 moves upward and pushes the trapezoidal block 93. The trapezoidal block 93 extends along the guide hole 92 and abuts the inner wall of the center hole of the flange, which can fix and limit the flange. The friction between the wear-resistant ball 96 and the annular plate 52 is small, which avoids hindering the deflection of the receiving seat 7.

[0051] Example 2

[0052] An annular tooth groove 71 is provided in the middle of the outer wall of the receiving seat 7, and one end of the driving gear 57 extends into the make way opening 55 and is meshed with the annular tooth groove 71. A sealing ring 72 is connected to the upper part of the outer wall of the receiving seat 7, and a transmission cavity 73 is provided in the upper part of the receiving seat 7. The transmission cavity 73 is connected to the upper part of the stepped hole 8. The top center of the receiving seat 7 is connected to the motor frame 74, and the top of the inner wall of the motor frame 74 is connected to the steering motor 75. The bottom output end of the steering motor 75 extends into the transmission cavity 73 and is connected to the main gear 76. The outer wall of the tray 10 is connected to the ring gear 77, which is meshed with the main gear 76.

[0053] The top of the motor frame 74 is connected to a stroke tube 741, the upper end of the stroke tube 741 is connected to a hydraulic rod 742, the lower end of the hydraulic rod 742 is connected to a lifting block 743, the outer wall of the lifting block 743 is hinged with multiple traction rods 744, the wall of the stroke tube 741 is provided with a vertical slot 745 for the traction rod 744 to pass through, the lower end of the traction rod 744 is hinged with a horizontal rack 746, the top of the receiving seat 7 is circumferentially connected to multiple transmission shells 78, the transmission shell 78 is rotatably connected with a vertical shaft 781, the outer wall of the vertical shaft 781 is connected to a large gear 782 and a small gear 783 above and below, and the end of the horizontal rack 746 extends into the transmission shell 78 and meshes with the small gear 783.

[0054] The top of the stepped hole 8 is connected to a limit plate 81 in front and back, and an L-shaped rod 82 is movably inserted in the limit plate 81. The two L-shaped rods 82 are symmetrically connected to an arc plate 83 on one side. The arc plate 83 has a plurality of rectangular openings 84 along the length direction. A guide roller 85 is rotatably connected in the rectangular opening 84. The transverse part of the L-shaped rod 82 is connected to a longitudinal rack 86. The end of the longitudinal rack 86 extends into the transmission housing 78 and is meshed with the large gear 782. The two longitudinal racks 86 are arranged in a central symmetrical structure about the center of the large gear 782.

[0055] The specific method of this embodiment is:

[0056] In this embodiment, when loading, the joint pipe is placed on the top of the flange, and the hydraulic rod 742 is used to drive the lifting block 743 to descend, and the angle of the traction rod 744 changes accordingly. The upper end of the traction rod 744 moves downward with the lifting block 743, and the lower end of the traction rod 744 drives the horizontal rack 746 to translate. The end of the horizontal rack 746 extends into the transmission housing 78 and engages the transmission pinion 783, so that the vertical shaft 781 drives the large gear 782 to rotate, and the large gear 782 engages the longitudinal racks 86 on both sides of the transmission, so that the longitudinal racks 86 drive the L-shaped rod 82 to move, and the distance between the two arc plates 83 is reduced. The guide roller 85 fits the outer wall of the joint pipe, limiting the position without hindering the pipe from rotating around its own axis.

[0057] The driving motor 56 is used to drive the driving gear 57 to rotate, and the driving gear 57 engages the transmission annular tooth groove 71, so that the receiving seat 7 deflects the central axis 6, which can realize the position switching of the work station. When the workpiece reaches the welding station, the steering motor 75 is used to drive the main gear 76 to rotate, and the main gear 76 engages the transmission ring gear 77. The tray 10 can rotate around the axis of the hollow tube 9, which is convenient for the welding processing of the annular weld.

[0058] Example 3

[0059] On the basis of Example 2, the inner wall of the welding frame 11 is connected to a ramp 111, and a limiting groove 112 is provided on the top of the ramp 111. A screw rod 113 is rotatably connected in the limiting groove 112, and a screw motor 114 is connected to the lower end of the screw rod 113. A nut seat 115 is screwed on the outer wall of the screw rod 113, and the top of the nut seat 115 is connected to a linkage frame 116. A welding gun 117 is installed at the lower part of the linkage frame 116. The angle between the axis of the screw rod 113 and the horizontal plane is 45 degrees. A vertical cylinder 118 is connected to the right side of the top of the welding frame 11, and a piston rod 119 is connected to the bottom of the vertical cylinder 118. The lower end of the piston rod 119 is rotatably connected to the pressure block 110

[0060] The left side of the bottom of the inner cavity of the flip shell 5 is connected to an infrared signal transmitter 58, and the bottom circumference of the receiving seat 7 is connected to a plurality of infrared signal receivers 79. When the infrared signal transmitter 58 and the infrared signal receiver 79 are aligned, the pressing block 110 is arranged coaxially with the left stepped hole 8.

[0061] The outer wall of the rear side guard plate 3 is connected to a worm motor 31, and the output end of the worm motor 31 is connected to a worm 32. The end of the rear steering shaft 4 is connected to a worm wheel 41, and the worm wheel 41 is meshed with the worm 32. The unfolded spiral angle of the worm 32 is smaller than the friction angle of the contact between the worm wheel 41 and the worm 32. The end of the front steering shaft 4 is connected to a scale pointer 42. The outer wall of the front side guard plate 3 is provided with an angle scale that matches the scale pointer 42 to achieve visual adjustment and enhance operational safety. A discharge port 101 is opened on the right side of the workbench 1, and a material guide slope is provided at the lower end of the discharge port 101. A rubber pad 102 is connected to the top of the material guide slope.

[0062] The specific method of this embodiment is:

[0063] In this embodiment, the infrared signal transmitter 58 is used to send a signal, and the position of the infrared signal receiver 79 moves as the receiving seat 7 rotates. When the infrared signal transmitter 58 is aligned with the infrared signal receiver 79, the working position is reached. At this time, the pressing block 110 is coaxial with the left stepped hole 8, and the driving motor 56 is suspended. The screw motor 114 is used to drive the screw 113 to rotate, and the nut seat 115 drives the linkage rod 116 to move. The working part of the welding gun 117 contacts the pipe and the flange welding end, and the vertical cylinder 118 is used to drive the piston rod 119 to descend. The pressing block 110 presses the upper end of the pipe. After the steering motor 75 is started, the tray 10 drives the flange to rotate, and the pipe also rotates accordingly, avoiding the deviation of the welding position, which is conducive to ensuring the welding quality of the annular weld.

[0064] After completing the welding work of a single station, the vertical cylinder 118 drives the piston rod 119 to rise, the pressure block 110 is separated from the upper end of the pipeline, and the drive motor 56 continues to operate to realize the station switching. The welding work is repeated until all workpieces are welded. The welding gun 117 is controlled to retract. After the electromagnet 54 is powered off, the reset spring 59 and the tension spring 59 are reset, and the flange limit contact is made. After the hydraulic rod 742 drives the lifting block 743 to rise, the distance between the two arc plates 83 increases, and the pipeline limit is released. After the worm motor 31 works, the worm 32 engages the transmission worm gear 41, so that the steering shaft 4 drives the flip shell 5 to flip, and the completed workpiece falls into the discharge port 101 below. The rubber pad 102 is used to reduce the damage caused by collision. The container is placed at the lower end of the discharge slope for collection.

[0065] Throughout this specification, references to terms such as "one embodiment," "example," or "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0066] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to the specific embodiments described. Obviously, many modifications and variations are possible based on the content of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. An automatic welding mechanism for a pipe annular weld, comprising a workbench (1), characterized in that: The bottom four corners of the workbench (1) are connected to moving wheels (2), the top of the workbench (1) is connected to side guard plates (3) at the front and rear ends, the upper part of the side guard plates (3) is rotatably connected to a steering shaft (4), a flip shell (5) is connected between the two steering shafts (4), the upper end of the flip shell (5) is open, the inner wall center of the flip shell (5) is rotatably connected to a central shaft (6), the top of the central shaft (6) is connected to a receiving seat (7), the top of the receiving seat (7) is provided with a plurality of stepped holes (8) in the circumferential direction, the lower part of the inner cavity of the stepped hole (8) is rotatably connected to a hollow tube (9), the upper part of the outer wall of the hollow tube (9) is connected to a tray (10), the left side of the top of the workbench (1) is connected to a welding frame (11), and the front end of the workbench (1) is connected to a PLC controller (12).

2. The automatic welding mechanism for annular pipe weld according to claim 1, characterized in that: The top of the hollow tube (9) is connected to a cylindrical shell (91), and three guide holes (92) are circumferentially opened on the upper side wall of the cylindrical shell (91). A trapezoidal block (93) is movably inserted into the guide hole (92). One end of the trapezoidal block (93) extending out of the cylindrical shell (91) is provided with a protrusion, and a tension spring (94) is connected between the protrusion and the outer wall of the cylindrical shell (91). One end of the trapezoidal block (93) extending into the cylindrical shell (91) is provided with an inclined surface inclined downward. A top column (95) runs through the hollow tube (9), and the upper end of the top column (95) abuts against the inclined surface of the trapezoidal block (93). The lower end of the top column (95) is embedded with a wear-resistant ball (96).

3. The automatic welding mechanism for annular pipe weld according to claim 2, characterized in that: The bottom of the flip shell (5) is movably connected with a plurality of vertical rods (51), the lower part of the vertical rods (51) is sleeved with a return spring (59), the upper ends of the plurality of vertical rods (51) are commonly connected with an annular plate (52), the annular plate (52) is coaxially arranged with the central axis (6), the wear-resistant balls (96) abut against the upper surface of the annular plate (52), the lower ends of the plurality of vertical rods (51) are commonly connected with a metal block (53), the bottom center of the flip shell (5) is embedded with an electromagnet (54), the electromagnet (54) is located directly above the metal block (53), the upper right end of the flip shell (5) is provided with a clearance opening (55), the lower right end of the flip shell (5) is connected with a drive motor (56), and the top output end of the drive motor (56) is connected with a drive gear (57).

4. The automatic welding mechanism for annular pipe weld according to claim 3, characterized in that: An annular tooth groove (71) is provided in the middle of the outer wall of the receiving seat (7), one end of the driving gear (57) extends into the yielding port (55) and is meshed with the annular tooth groove (71), the upper part of the outer wall of the receiving seat (7) is connected with a sealing ring (72), the upper part of the receiving seat (7) is provided with a transmission cavity (73), the transmission cavity (73) is connected to the upper part of the stepped hole (8), the top center of the receiving seat (7) is connected to a motor frame (74), the top of the inner wall of the motor frame (74) is connected to a steering motor (75), the bottom output end of the steering motor (75) extends into the transmission cavity (73) and is connected to a main gear (76), the outer wall of the tray (10) is connected with a gear ring (77), and the gear ring (77) is meshed with the main gear (76).

5. The automatic welding mechanism for annular pipe welds according to claim 4, characterized in that: The top of the motor frame (74) is connected to a stroke tube (741), the upper end of the stroke tube (741) is connected to a hydraulic rod (742), the lower end of the hydraulic rod (742) is connected to a lifting block (743), the outer wall of the lifting block (743) is hinged with multiple traction rods (744), the wall of the stroke tube (741) is provided with a vertical slot (745) for the traction rod (744) to pass through, the lower end of the traction rod (744) is hinged with a transverse rack (746), the top of the receiving seat (7) is circumferentially connected to multiple transmission housings (78), a vertical shaft (781) is rotatably connected in the transmission housing (78), the outer wall of the vertical shaft (781) is connected to a large gear (782) and a small gear (783) at the upper and lower sides, and the end of the transverse rack (746) extends into the transmission housing (78) and is meshed with the small gear (783).

6. The automatic pipe annular weld welding mechanism according to claim 5, characterized in that: The top of the stepped hole (8) is connected to a limiting plate (81) at the front and rear ends. An L-shaped rod (82) is movably inserted into the limiting plate (81). An arc plate (83) is symmetrically connected to one side of the two L-shaped rods (82). The arc plate (83) is provided with a plurality of rectangular openings (84) along the length direction. A guide roller (85) is rotatably connected in the rectangular opening (84). A longitudinal rack (86) is connected to the transverse portion of the L-shaped rod (82). The end of the longitudinal rack (86) extends into the transmission housing (78) and is meshed with the large gear (782). The two longitudinal racks (86) are arranged in a centrally symmetrical structure about the center of the large gear (782).

7. The automatic pipe annular weld welding mechanism according to claim 1, characterized in that: The inner wall of the welding frame (11) is connected to an inclined platform (111), a limiting groove (112) is provided on the top of the inclined platform (111), a screw rod (113) is rotatably connected in the limiting groove (112), a screw motor (114) is connected to the lower end of the screw rod (113), a nut seat (115) is screwed on the outer wall of the screw rod (113), a linkage frame (116) is connected to the top of the nut seat (115), a welding gun (117) is installed at the lower part of the linkage frame (116), an angle between the axis of the screw rod (113) and the horizontal plane is 45 degrees, a vertical cylinder (118) is connected to the right side of the top of the welding frame (11), a piston rod (119) is connected to the bottom of the vertical cylinder (118), and a pressure block (110) is rotatably connected to the lower end of the piston rod (119).

8. The automatic welding mechanism for annular pipe welds according to claim 7, characterized in that: An infrared signal transmitter (58) is connected to the left side of the bottom of the inner cavity of the flip shell (5), and a plurality of infrared signal receivers (79) are connected to the bottom circumference of the receiving seat (7). When the infrared signal transmitter (58) and the infrared signal receiver (79) are aligned, the pressing block (110) and the left stepped hole (8) are arranged coaxially.

9. The automatic pipe annular weld welding mechanism according to claim 1, characterized in that: The outer wall of the rear side guard plate (3) is connected to a worm motor (31), the output end of the worm motor (31) is connected to a worm (32), the end of the rear side steering shaft (4) is connected to a worm wheel (41), the worm wheel (41) is meshed with the worm (32), the unfolded helix angle of the worm (32) is smaller than the friction angle of contact between the worm wheel (41) and the worm (32), the end of the front side steering shaft (4) is connected to a scale pointer (42), the outer wall of the front side guard plate (3) is provided with an angle scale matched with the scale pointer (42), the right part of the workbench (1) is provided with a discharge port (101), the lower end of the discharge port (101) is provided with a material guide slope, the top of the material guide slope is connected to a rubber pad (102).

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