A circular tubular string annular weld apparatus

Abstract

The present application relates to the technical field of welding device, and particularly relates to a circular pipe column ring seam welding equipment. The circular pipe column ring seam welding equipment comprises a first pipe, a second pipe, a welding gun and a motion mechanism. The motion mechanism comprises a motion assembly, the motion assembly comprises a motion unit, the motion unit comprises a driving wheel, and the motion assembly has a first state and a second state. When the motion assembly is in the first state, the driving wheel drives the first pipe and the second pipe to move in the axial direction. When the motion assembly is in the second state, the driving wheel drives the second pipe to rotate to drive the welding gun to rotate to implement welding. The motion assembly enables axial positioning and circumferential welding to be completed by the same set of driving systems, thereby realizing efficient operation of automatic positioning and automatic welding in the pipe. The present application provides a circular pipe column ring seam welding equipment to solve the problems of high cost and poor precision caused by the fact that two sets of independent driving systems are used for axial movement and circumferential rotation of the existing pipe welding machine.

Description

Technical Field

[0001] This invention relates to the field of welding equipment technology, and specifically to a circumferential welder for a circular tube column. Background Technology

[0002] A welding apparatus is a process equipment that uses heating, pressurization, or both, and with or without welding material, to achieve a permanent atomic bond between separated metal workpieces. With the development of modern industry, welding apparatus has evolved from traditional simple tools such as manual welding clamps and welding torches into comprehensive operating systems that integrate mechanical transmission, electrical control, sensing and detection, and automation technology.

[0003] Depending on the working space, welding equipment can be divided into external welding equipment and internal welding equipment. Internal welding equipment can extend into the inside of tubular workpieces to perform circumferential welding. It is especially suitable for the butt welding of circular pipe columns and other components that are difficult to turn over. It can achieve single-sided welding and double-sided forming. It is usually composed of modules such as a walking mechanism, a positioning mechanism, a welding gun adjustment mechanism, a wire feeding mechanism and a control system. It can complete high-precision welding operations in a confined space.

[0004] For example, patent application CN107552921A discloses a pipe welding machine, including a rotating guide frame, a traveling device, a straight-moving component, a welding torch, and a controller. The rotating guide frame is connected to the traveling device, and the welding torch is located at the end of the straight-moving component. During welding, the controller adjusts the distance between the welding torch and the pipe wall according to the arc voltage to achieve automatic adjustment of the weld penetration. However, in the above-mentioned pipe welding machine, axial movement and circumferential rotation are completed by two independent drive systems, which not only increases the equipment cost and overall size, but also requires the re-establishment of the positioning reference when switching motion modes, resulting in a loss of accuracy and affecting the uniformity of weld formation; at the same time, the existence of two systems also increases the number of failure points and reduces the reliability of on-site operations. Summary of the Invention

[0005] This invention provides a circumferential welding device for circular pipe columns to solve the problems of high cost and poor accuracy caused by the use of two independent drive systems for axial movement and circumferential rotation in existing pipe welding machines.

[0006] The present invention provides a circumferential welding device for a circular tube column, which adopts the following technical solution: A circumferential welding device for a circular tube column is installed inside the circular tube column and includes a first through pipe, a second through pipe, a welding gun, and a motion mechanism. The first through pipe and the second through pipe are both coaxially arranged with the circular tube column and are distributed sequentially along the axial direction of the circular tube column. The first through pipe and the second through pipe move synchronously, and the second through pipe can rotate relative to the first through pipe around its own axis.

[0007] The motion mechanism includes a limiting component, a motion component, and a first adjusting component. The limiting component restricts the rotation of the first through pipe about its own axis. The motion component includes at least two motion units distributed circumferentially along the second through pipe. Each motion unit includes a first telescopic rod and a drive wheel. The first telescopic rod is disposed on the outer wall of the second through pipe and is perpendicular to the outer wall of the second through pipe. A rotating frame is rotatably mounted on the end of the first telescopic rod away from the second through pipe. The drive wheel is rotatably mounted on the rotating frame and abuts against the inner wall of the circular pipe column. The welding torch is disposed on the outer wall of the second through pipe.

[0008] The motion assembly has a first state and a second state. In the first state, the axis of the drive wheel is tangentially aligned with the second through-tube. In the second state, the axis of the drive wheel is axially aligned with the second through-tube. When the motion assembly is in the first state, the rotation of the drive wheel causes the first through-tube to move axially along the circular tube column, and the first through-tube causes the second through-tube to move synchronously. When the motion assembly is in the second state, the rotation of the drive wheel causes the second through-tube to rotate relative to the first through-tube. The first adjustment assembly changes the axial direction of the drive wheel by rotating the rotating frame, thereby switching the motion assembly between the first and second states.

[0009] Furthermore, a first adjusting assembly is disposed on the second through pipe. The first adjusting assembly includes two first adjusting units, which are respectively located on both sides of the rotating frame along the axial direction of the second through pipe. Each first adjusting unit includes a first movable ring and at least two first connecting rods. The first movable ring and the second through pipe are coaxially disposed and slidably disposed on the outside of the second through pipe.

[0010] Two first connecting rods are distributed circumferentially along the first movable ring, and the first connecting rods are inclined. One first connecting rod in each first adjusting unit corresponds to one moving unit. One end of each first connecting rod is rotatably connected to the first movable ring. The other end of each first connecting rod is provided with a first sliding rod, which is perpendicular to the axial direction of the first telescopic rod and also perpendicular to the direction of extension of the corresponding first connecting rod. Each first sliding rod is rotatably connected to a rotating frame and can slide relative to the rotating frame along the axial direction of the first sliding rod. When the two first movable rings approach each other, they can extend the first telescopic rod via the first connecting rods.

[0011] Furthermore, the two first connecting rods on the same rotating frame are distributed circumferentially along the second through pipe. When the two first movable rings are far apart, they tend to drive the rotating frame to rotate in the opposite direction via the first connecting rods. When the two first movable rings are close together, they tend to drive the rotating frame to rotate in the forward direction via the first connecting rods.

[0012] Each rotating frame is fixedly equipped with a first baffle, and each first telescopic rod has a second baffle and a third baffle fixedly installed at the end away from the second through pipe. The first and second baffles are distributed sequentially along the circumference of the first telescopic rod. The third baffle abuts against the first baffle to restrict the reverse rotation of the rotating frame.

[0013] A torsion spring is installed on the rotating frame, connecting the first and second baffles to prevent the frame from rotating in the forward direction. When the force of the two first movable rings approaching each other overcomes the elastic force of the torsion spring, the frame can rotate in the forward direction.

[0014] Furthermore, the two first active rings are the first ring and the second ring, which are distributed sequentially along the direction from the first conduit to the second conduit.

[0015] The first adjusting assembly further includes a first transmission unit, which comprises a first hydraulic cylinder, a second hydraulic cylinder, and a first piston rod. The first hydraulic cylinder, second hydraulic cylinder, and first piston rod are all arranged axially along the second passage pipe. The first hydraulic cylinder is mounted on a first ring, the second hydraulic cylinder is mounted on a second ring, and the first piston rod is fixed inside the second passage pipe. Both ends of the first piston rod extend into the first and second hydraulic cylinders, respectively. A first piston is located at the end of the first piston rod extending into the first hydraulic cylinder, dividing the cavity inside the first hydraulic cylinder into a first space and a second space. A second piston is located at the end of the first piston rod extending into the second hydraulic cylinder, dividing the cavity inside the second hydraulic cylinder into a third space and a fourth space. The first space communicates with the third space, and the second space communicates with the fourth space.

[0016] When the first ring moves the first hydraulic cylinder toward the direction of the rotating frame, the hydraulic oil in the first space enters the third space, which in turn moves the second hydraulic cylinder and the second ring toward the direction of the rotating frame.

[0017] Furthermore, the limiting assembly includes at least two limiting units, which are sequentially distributed along the circumference of the first through pipe. Each limiting unit includes a second telescopic rod and a roller. The second telescopic rod is radially positioned along the first through pipe and is disposed on the outer side wall of the first through pipe. A connecting frame is disposed at the end of the second telescopic rod away from the first through pipe. The roller is rotatably disposed on the connecting frame, and the axis of the roller is disposed tangentially along the first channel. The roller is used to abut against the inner side wall of the circular pipe column.

[0018] Furthermore, the motion mechanism also includes a second adjustment assembly, which is disposed on the first through pipe. The second adjustment assembly includes two second adjustment units, which are respectively located on both sides of the connecting frame along the axial direction of the first through pipe.

[0019] Each second adjustment unit includes a second movable ring and at least two second connecting rods. The second movable ring is coaxially arranged with the first through pipe and slidably disposed outside the first through pipe. One second connecting rod in each second adjustment unit corresponds to one motion unit. The two second connecting rods are distributed circumferentially along the first movable ring and are inclined. One end of each second connecting rod is rotatably connected to the second movable ring. The other end of each second connecting rod is hinged to a connecting frame. When the two second movable rings approach each other, the second telescopic rod can be extended via the second connecting rods.

[0020] Furthermore, the two second active rings are the third ring and the fourth ring, which are distributed sequentially along the direction from the first conduit to the second conduit.

[0021] The second adjustment assembly also includes a second transmission unit, which comprises a third hydraulic cylinder, a fourth hydraulic cylinder, and a second piston rod. All three hydraulic cylinders are axially aligned along the first through-pipe. The third hydraulic cylinder is mounted on a third ring, and the fourth hydraulic cylinder is mounted on a fourth ring. The second piston rod is fixed inside the first through-pipe, with both ends extending into the third and fourth hydraulic cylinders, respectively. A third piston is located at the end of the second piston rod extending into the third hydraulic cylinder, dividing the cavity within the third hydraulic cylinder into a fifth and a sixth space. A fourth piston is located at the end of the second piston rod extending into the fourth hydraulic cylinder, dividing the cavity within the fourth hydraulic cylinder into a seventh and an eighth space. The fifth and seventh spaces are connected, as are the sixth and eighth spaces.

[0022] When the third ring moves the third hydraulic cylinder toward the connecting frame, the hydraulic oil in the fifth space enters the seventh space, causing the fourth hydraulic cylinder and the fourth ring to move toward the connecting frame.

[0023] Furthermore, the circumferential welding equipment for a circular tube column also includes a drive mechanism. The drive mechanism includes a first drive assembly, which includes a tension spring. The tension spring is arranged axially along a first through-tube and is located inside a second through-tube. The two ends of the tension spring are respectively connected to a third ring and a second ring. The tension spring is used to drive the third ring and the second ring closer together.

[0024] Furthermore, the drive mechanism also includes a second drive assembly, which includes a hydraulic cylinder arranged axially along the first through pipe. One end of the hydraulic cylinder is fixedly connected to the fourth ring, and the other end of the hydraulic cylinder is fixedly provided with a rotating ring. The rotating ring and the second through pipe are coaxially arranged, and the first ring and the rotating ring are rotatably connected.

[0025] The second drive assembly has a third state and a fourth state. In the third state, the extended end of the hydraulic cylinder is allowed to extend and retract freely. In the fourth state, the extended end of the hydraulic cylinder extends or retracts under hydraulic pressure. When the motion assembly is in the first state, the second drive assembly is in the third state. When the motion assembly is in the second state, the second drive assembly is in the fourth state.

[0026] Furthermore, the motion component also includes at least one motor, which is fixedly mounted on a rotating frame. The motor's output shaft is connected to a drive wheel.

[0027] The beneficial effects of this invention are as follows: The circular pipe column circumferential welding device of this invention, by setting a motion component having a first state and a second state, allows the drive wheel to move the first and second through pipes axially when the motion component is in the first state. When the motion component is in the second state, the drive wheel can rotate the second through pipe, thereby causing the welding gun to rotate circumferentially to weld the seam.

[0028] The motion assembly enables axial positioning and circumferential welding to be completed in a time-sharing manner by the same drive system, achieving highly efficient operation of automatic positioning and welding within the pipe. Compared to existing technologies that require two independent drive systems, this invention significantly simplifies the equipment structure. Furthermore, in circumferential welding mode, the first through-pipe remains stationary as a positioning reference, while the second through-pipe rotates relative to it, avoiding positioning deviations caused by reference conversion between different systems and effectively ensuring the consistency of the welding trajectory and the accuracy of weld formation. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art 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.

[0030] Figure 1 This is a schematic diagram of the structure of a circular tube column circumferential welder provided in an embodiment of the present invention; Figure 2 This is a front view of a circular tube column circumferential welding device provided in an embodiment of the present invention; Figure 3 for Figure 2 Partial sectional view along the AA direction; Figure 4 A schematic diagram of the moving components of a circular tube column circumferential welder in a first state, provided in an embodiment of the present invention; Figure 5 for Figure 4 Enlarged view of point C in the middle; Figure 6 A schematic diagram of the motion components of a circular tube column circumferential welding device in a second state, provided in an embodiment of the present invention; Figure 7 for Figure 6 Enlarged view at point D; Figure 8 A side view of a circular tube column circumferential welding device provided in an embodiment of the present invention; Figure 9 for Figure 8 Sectional view along the BB direction; Figure 10 for Figure 9 Enlarged view at point E in the middle; Figure 11 A schematic diagram of a circular tube column circumferential welder provided in an embodiment of the present invention, located inside circular tube columns of different diameters; Figure 12 This is a partial structural schematic diagram of a circular tube column circumferential welder provided in an embodiment of the present invention; Figure 13 for Figure 3 Enlarged view of point F in the middle.

[0031] In the diagram: 101, second connecting rod; 102, roller; 103, third ring; 104, fourth ring; 105, second telescopic rod; 106, connecting frame; 201, first connecting rod; 203, first ring; 204, second ring; 205, drive wheel; 206, first telescopic rod; 207, first hydraulic cylinder; 208, second hydraulic cylinder; 209, tension spring; 210, welding gun; 211, rotating frame; 220, first sliding rod; 230, torsion spring; 240, first piston rod; 241, first space; 242, second space; 243, third space; 244, fourth space; 250, first baffle; 251, second baffle; 252, third baffle; 301, first through pipe; 302, second through pipe; 400, circular column. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Reference Figures 1 to 13As shown in the figure, an embodiment of the present invention provides a circumferential welding device for a circular tube column, which is disposed within the circular tube column 400 and includes a first through pipe 301, a second through pipe 302, a welding gun 210, and a motion mechanism. The first through pipe 301 and the second through pipe 302 are both coaxially arranged with the circular tube column 400 and are distributed sequentially along the axial direction of the circular tube column 400. The first through pipe 301 and the second through pipe 302 move synchronously, and the second through pipe 302 can rotate relative to the first through pipe 301 around its own axis.

[0034] The motion mechanism includes a limiting component, a motion component, and a first adjusting component. The limiting component is located on the outside of the first through pipe 301 and is used to restrict the first through pipe 301 from rotating about its own axis. The motion component is located on the outside of the second through pipe 302 and includes at least two motion units distributed circumferentially along the second through pipe 302. Each motion unit includes a first telescopic rod 206 and a drive wheel 205. The first telescopic rod 206 is telescopic and is located on the outer wall of the second through pipe 302, perpendicular to the outer wall of the second through pipe 302. A rotating frame 211 is rotatably mounted on the end of the first telescopic rod 206 away from the second through pipe 302. The drive wheel 205 is rotatably mounted on the rotating frame 211 and is used to abut against the inner wall of the circular tube column 400. The welding gun 210 is fixedly mounted on the outer wall of the second through pipe 302 and is located between the limiting component and the motion component.

[0035] The motion component has a first state and a second state. In the first state, the axis of the drive wheel 205 is tangentially aligned with the second through pipe 302. In the second state, the axis of the drive wheel 205 is axially aligned with the second through pipe 302. When the motion component is in the first state, the rotation of the drive wheel 205 causes the first through pipe 301 to move axially along the circular tube column 400, and the first through pipe 301 causes the second through pipe 302 to move synchronously. When the motion component is in the second state, the rotation of the drive wheel 205 causes the second through pipe 302 to rotate relative to the first through pipe 301. The first adjustment component changes the axial direction of the drive wheel 205 by rotating the rotating frame 211, thereby switching the motion component between the first and second states.

[0036] Initially, the motion assembly is in the first state. When the device is placed into the two circular tubes 400 to be welded, the second tube 302 is located in front of the first tube 301 along the insertion direction, and the drive wheel 205 abuts against the inner wall of the circular tube 400. The drive wheel 205 rotates, driving the second tube 302 to move axially along the circular tube 400 through the connecting frame 106 and the first telescopic rod 206. The second tube 302 drives the first tube 301 to move synchronously until the welding gun 210 is aligned with the weld seam, at which point the drive wheel 205 stops rotating. Subsequently, the first adjusting component drives the rotating frame 211 to rotate, switching the motion assembly from the first state to the second state. At this time, the drive wheel 205 rotates again, and the limiting component restricts the first tube 301 from rotating around its own axis. The drive wheel 205 drives the second tube 302 to rotate circumferentially relative to the first tube 301 through the first telescopic rod 206. The second tube 302 then drives the welding gun 210 to rotate synchronously, completing the circumferential weld operation.

[0037] In this embodiment, a first adjustment assembly is disposed on the second passage pipe 302. The first adjustment assembly includes two first adjustment units, which are respectively located on both sides of the rotating frame 211 along the axial direction of the second passage pipe 302. Each first adjustment unit includes a first movable ring and at least two first connecting rods 201. The first movable ring and the second passage pipe 302 are coaxially disposed and can be slidably disposed on the outside of the second passage pipe 302 along the axial direction of the second passage pipe 302.

[0038] Two first connecting rods 201 are distributed circumferentially along the first movable ring, and the first connecting rods 201 are inclined. One first connecting rod 201 in each first adjustment unit corresponds to one motion unit. One end of each first connecting rod 201 is rotatably connected to the first movable ring. The other end of each first connecting rod 201 is fixedly provided with a first sliding rod 220, which is perpendicular to the axial direction of the first telescopic rod 206 and perpendicular to the direction of extension of the first connecting rod 201 to which it is located. Each first sliding rod 220 is rotatably connected to a rotating frame 211 and can slide relative to the rotating frame 211 along the axial direction of the first sliding rod 220.

[0039] The distance from the end of the first connecting rod 201 connected to the rotating frame 211 to the axis of the second through pipe 302 is greater than the distance from the end of the first connecting rod 201 connected to the first movable ring to the axis of the second through pipe 302. When the two first movable rings approach each other, they can extend the first telescopic rod 206 through the first connecting rod 201. When the two first movable rings move away from each other, they can shorten the first telescopic rod 206 through the first connecting rod 201.

[0040] In this embodiment, two first connecting rods 201 on the same rotating frame 211 are sequentially distributed along the circumference of the second through pipe 302. When the two first movable rings are far apart, they tend to drive the rotating frame 211 to rotate in the opposite direction via the first connecting rods 201. When the two first movable rings are close together, they tend to drive the rotating frame 211 to rotate in the forward direction via the first connecting rods 201.

[0041] like Figure 12 and Figure 13 As shown, the rotating frame 211 rotates counterclockwise when it rotates in the opposite direction and clockwise when it rotates in the forward direction.

[0042] Each rotating frame 211 is fixedly equipped with a first baffle 250, and each first telescopic rod 206 is fixedly equipped with a second baffle 251 and a third baffle 252 at the end away from the second through pipe 302. The first baffle 250 and the second baffle 251 are distributed sequentially along the circumference of the first telescopic rod 206. The third baffle 252 abuts against the first baffle 250 to restrict the reverse rotation of the rotating frame 211.

[0043] A torsion spring 230 is provided on the rotating frame 211, and the torsion spring 230 is arranged circumferentially along the first telescopic rod 206. The torsion spring 230 connects the first baffle 250 and the second baffle 251, and is used to prevent the forward rotation of the rotating frame 211. When the force of the two first movable rings approaching each other overcomes the elastic force of the torsion spring 230, the rotating frame 211 can rotate forward.

[0044] In this embodiment, the two first movable rings are a first ring 203 and a second ring 204, which are distributed sequentially along the direction from the first conduit 301 to the second conduit 302. The first ring 203 is slidably disposed on the outer wall of the second conduit 302, and the second ring 204 is located on the side of the second conduit 302 away from the first conduit 301. A first groove is formed on the outer wall of the second conduit 302, and the first groove is arranged along the axial direction of the second conduit 302. A first protrusion is fixedly disposed on the inner wall of the first ring 203, and the first protrusion is slidably disposed in the first groove.

[0045] The first adjustment assembly further includes a first transmission unit, which comprises a first hydraulic cylinder 207, a second hydraulic cylinder 208, and a first piston rod 240. The first hydraulic cylinder 207, the second hydraulic cylinder 208, and the first piston rod 240 are all arranged along the axial direction of the second through pipe 302. The first hydraulic cylinder 207 is fixedly connected to the first protrusion, and the second hydraulic cylinder 208 is fixedly connected to the second ring 204.

[0046] The first piston rod 240 is fixedly disposed on the inner side wall of the second through pipe 302. The first piston rod 240 is located between the first hydraulic cylinder 207 and the second hydraulic cylinder 208, with both ends of the first piston rod 240 extending into the first hydraulic cylinder 207 and the second hydraulic cylinder 208, respectively. A first piston is fixedly disposed at the end of the first piston rod 240 that extends into the first hydraulic cylinder 207, and the first piston divides the cavity inside the first hydraulic cylinder 207 into a first space 241 and a second space 242, which are distributed sequentially along the direction from the first through pipe 301 to the second through pipe 302.

[0047] A second piston is fixedly mounted on one end of the first piston rod 240 that extends into the second hydraulic cylinder 208. The second piston divides the cavity inside the second hydraulic cylinder 208 into a third space 243 and a fourth space 244, which are distributed sequentially along the direction from the first connecting pipe 301 to the second connecting pipe 302. Hydraulic oil is contained in all three spaces: the first space 241, the second space 242, the third space 243, and the fourth space 244. The first space 241 and the third space 243 are connected by a first oil pipe, and the second space 242 and the fourth space 244 are connected by a second oil pipe.

[0048] When the first ring 203 drives the first hydraulic cylinder 207 to move closer to the movable frame, the hydraulic oil in the first space 241 enters the third space 243 through the first oil pipe, which in turn causes the second hydraulic cylinder 208 to move closer to the movable frame, thereby driving the second ring 204 to move closer to the movable frame.

[0049] When the second ring 204 moves the second hydraulic cylinder 208 toward the movable frame, the hydraulic oil in the fourth space 244 enters the second space 242 through the second oil pipe, thereby causing the first hydraulic cylinder 207 to move toward the movable frame, which in turn moves the first ring 203 toward the movable frame. The first transmission unit ensures that the first ring 203 and the second ring 204 move the same distance.

[0050] In this embodiment, a limiting component is disposed on the outside of the first through pipe 301. The limiting component includes at least two limiting units, which are distributed sequentially along the circumference of the first through pipe 301. Each limiting unit includes a second telescopic rod 105 and a roller 102.

[0051] The second telescopic rod 105 is retractable and extends radially along the first through pipe 301. The second telescopic rod 105 is mounted on the outer wall of the first through pipe 301, and a connecting frame 106 is provided at the end of the second telescopic rod 105 away from the first through pipe 301. A roller 102 is rotatably mounted on the connecting frame 106, and the axis of the roller 102 is tangentially aligned with the first channel. The roller 102 is used to abut against the inner wall of the circular tube column 400.

[0052] In other embodiments, each connecting frame 106 has at least two rollers 102, which are distributed sequentially along the axial direction of the first through pipe 301. The two rollers 102 can provide stable support for the first through pipe 301, preventing axial displacement of the first through pipe 301 caused by vibration generated by the rotation of the second through pipe 302.

[0053] In this embodiment, the motion mechanism further includes a second adjustment component, which is disposed on the first through pipe 301. The second adjustment component includes two second adjustment units, which are respectively located on both sides of the connecting frame 106 along the axial direction of the first through pipe 301.

[0054] Each second adjustment unit includes a second movable ring and at least two second connecting rods 101. The second movable ring and the first through pipe 301 are coaxially arranged, and the second movable ring is slidably disposed on the outside of the first through pipe 301 along the axial direction of the first through pipe 301. One second connecting rod 101 in each second adjustment unit corresponds to one motion unit. The two second connecting rods 101 are distributed circumferentially along the first movable ring, and the second connecting rods 101 are inclined. One end of each second connecting rod 101 is rotatably connected to the second movable ring. The other end of each second connecting rod 101 is hinged to a connecting frame 106. The distance from the end of the second connecting rod 101 connected to the connecting frame 106 to the axis of the first through pipe 301 is greater than the distance from the end of the second connecting rod 101 connected to the second movable ring to the axis of the first through pipe 301. When the two second movable rings approach each other, the second telescopic rod 105 can be extended by the second connecting rod 101. When the two second movable rings move away from each other, the second telescopic rod 105 can be shortened by the second connecting rod 101.

[0055] In this embodiment, the two second movable rings are a third ring 103 and a fourth ring 104, which are distributed sequentially along the direction from the first through pipe 301 to the second through pipe 302. The third ring 103 is located on the side of the first through pipe 301 away from the second through pipe 302, and the fourth ring 104 is slidably disposed on the outer side wall of the first through pipe 301. A second sliding groove is formed on the outer side wall of the first through pipe 301, and the second sliding groove is arranged along the axial direction of the first through pipe 301. A second protrusion is fixedly disposed on the inner side wall of the fourth ring 104, and the second protrusion is slidably disposed in the second sliding groove. The second adjustment assembly also includes a second transmission unit, which includes a third hydraulic cylinder, a fourth hydraulic cylinder, and a second piston rod. The third hydraulic cylinder, the fourth hydraulic cylinder, and the second piston rod are all arranged along the axial direction of the first through pipe 301. The third hydraulic cylinder and the third ring 103 are fixedly connected, and the fourth hydraulic cylinder and the second protrusion are fixedly connected.

[0056] The second piston rod is fixedly mounted on the inner wall of the first connecting pipe 301, positioned between the third and fourth hydraulic cylinders, with both ends extending into the third and fourth hydraulic cylinders respectively. A third piston is fixedly mounted at the end of the second piston rod extending into the third hydraulic cylinder, dividing the cavity within the third hydraulic cylinder into a fifth and a sixth space, which are sequentially distributed along the direction from the first connecting pipe 301 to the second connecting pipe 302. A fourth piston is fixedly mounted at the end of the second piston rod extending into the fourth hydraulic cylinder, dividing the cavity within the second hydraulic cylinder 208 into a seventh and an eighth space, which are sequentially distributed along the direction from the first connecting pipe 301 to the second connecting pipe 302. Hydraulic oil is contained in all four spaces: the fifth, sixth, seventh, and eighth. The fifth and seventh spaces are connected via a third oil pipe, and the sixth and eighth spaces are connected via a fourth oil pipe.

[0057] When the third ring 103 moves the third hydraulic cylinder closer to the connecting frame 106, the hydraulic oil in the fifth space enters the seventh space through the third oil pipe, so that the fourth ring 104 moves closer to the movable connecting frame 106 via the fourth hydraulic cylinder. When the fourth ring 104 moves the fourth hydraulic cylinder closer to the connecting frame 106, the hydraulic oil in the eighth space enters the sixth space through the fourth oil pipe, so that the third ring 103 moves closer to the movable connecting frame 106 via the third hydraulic cylinder.

[0058] In this embodiment, the circumferential welding equipment for a circular tube column further includes a drive mechanism. The drive mechanism includes a first drive assembly, which includes a tension spring 209. The tension spring 209 is arranged axially along the first through pipe 301 and is located inside the first through pipe 301 and the second through pipe 302. The two ends of the tension spring 209 are respectively connected to a third ring 103 and a second ring 204. The tension spring 209 is used to drive the third ring 103 and the second ring 204 to move closer to each other.

[0059] The second ring 204 drives the first ring 203 to move in the direction of rotation via the first transmission unit. The third ring 103 drives the fourth ring 104 to move in the direction of rotation via the second transmission unit. The tension spring 209 ensures that the force of the first ring 203 and the second ring 204 moving closer together is insufficient to overcome the torque of the torsion spring 230, and the tension spring 209 alone cannot drive the rotating frame 211 to rotate in the forward direction.

[0060] In this embodiment, the driving mechanism further includes a second driving assembly, which includes a hydraulic cylinder. The hydraulic cylinder is axially arranged along the first through pipe 301 and is located outside the first through pipe 301. One end of the hydraulic cylinder is fixedly connected to the fourth ring 104, and the other end of the hydraulic cylinder is fixedly provided with a rotating ring. The rotating ring is coaxially arranged with the second through pipe 302 and rotatably disposed outside the second through pipe 302. The rotating ring is rotatably connected to the first ring 203, and the first ring 203 can rotate relative to the rotating ring.

[0061] The second drive assembly has a third state and a fourth state. In the third state, the hydraulic cylinder's oil supply circuit is unloaded, the oil supply circuit is connected to the return oil circuit, the oil circuit pressure is released, and the extended end of the hydraulic cylinder has no hydraulic driving force, allowing it to freely extend and retract under external force. In the fourth state, pressure is built up in the hydraulic cylinder's oil supply circuit, pressurized oil enters the hydraulic cylinder, driving the extended end of the hydraulic cylinder to extend or retract. When the motion assembly is in the first state, the second drive assembly is in the third state. When the motion assembly is in the second state, the second drive assembly is in the fourth state.

[0062] In this embodiment, the motion assembly further includes at least one motor, which is fixedly mounted on a rotating frame 211. The motor's output shaft is connected to a drive wheel 205. A vision sensor is mounted on the second through pipe 302 for detecting the location of the weld. A first controller is mounted on the motor, and the vision sensor is communicatively connected to the first controller. The first controller receives the weld position information detected by the vision sensor and controls the drive wheel 205 to stop rotating based on the weld position information, so that the welding gun 210 is aligned with the weld.

[0063] A detector is installed on the welding torch 210 to detect the alignment status of the welding torch 210 relative to the weld. A second controller is installed on the hydraulic cylinder, and the second controller is connected to the detector. After receiving the signal from the detector that the welding torch 210 is aligned with the weld, the second controller controls the hydraulic cylinder to switch to the fourth state.

[0064] Working process: In the initial state, the motion component is in the first state, and the second drive component is in the third state. The distance between the third ring 103 and the second ring 204 is brought to its closest point, that is, the second ring 204 is in the closest position to the rotating frame 211. The second ring 204, through the first transmission unit, keeps the distance between the first ring 203 and the second ring 204 as close as possible, thereby making the first telescopic rod 206 in its longest state. At the same time, the third ring 103 is closest to the connecting frame 106, and through the second transmission unit, the distance between the third ring 103 and the fourth ring 104 is minimized, thereby making the second telescopic rod 105 in its longest state.

[0065] When the device is placed into the two circular tubes 400 to be welded, the second through-tube 302 is located in front of the first through-tube 301 along the insertion direction. Under the action of the tension spring 209, both the drive wheel 205 and the roller 102 abut against the inner wall of the circular tube 400. The inner wall of the circular tube 400 compresses the first telescopic rod 206 and the second telescopic rod 105, causing them to shorten. Under the action of the first connecting rod 201, the first ring 203 and the second ring 204 move away from each other. Under the action of the second connecting rod 101, the third ring 103 and the fourth ring 104 move away from each other. At this time, the first ring 203 and the second ring 204 move away from each other, and the third baffle 252 restricts the rotation of the first baffle 250, thereby preventing the rotating frame 211 from rotating in the opposite direction.

[0066] Subsequently, the device stabilizes within the circular tube column 400. At this point, the tension force of the tension spring 209 on the second ring 204 is insufficient to overcome the torque of the torsion spring 230, so the rotating frame 211 remains stationary and does not rotate in the forward direction. It should be noted that at this time, the tension spring 209 only provides the preload force to keep the drive wheel 205 and roller 102 pressed against the tube wall, and its value is less than the resistance torque of the torsion spring 230. When the hydraulic cylinder subsequently actuates, its active output thrust is much greater than the torque of the torsion spring 230, thus driving the rotating frame 211 to rotate. The magnitudes of the forces in these two cases are not contradictory.

[0067] After the motor is started, it drives the drive wheel 205 to rotate. The drive wheel 205 drives the second through pipe 302 to move axially along the circular pipe column 400 through the connecting frame 106 and the first telescopic rod 206. The second through pipe 302 drives the first through pipe 301 to move synchronously. The vision sensor is used to detect the weld position. The first controller receives the weld position information fed back by the sensor and controls the drive wheel 205 to stop rotating accordingly, so that the welding gun 210 is accurately aligned with the weld.

[0068] The device, through the cooperation of limiting components and motion components, can adapt to circular tube columns 400 of different diameters, thus having a wide range of applications. Furthermore, with the limiting components and motion components positioned on opposite sides of the weld seam, they can respectively adapt to circular tube columns 400 of different diameters, enabling the welding of two circular tube columns 400 of different diameters and achieving automatic centering.

[0069] Furthermore, the tension spring 209 allows the motion assembly to retract the first telescopic rod 206 when an obstacle is present on the inner wall of the circular tube 400, enabling the drive wheel 205 to overcome the obstacle. The limiting assembly can also retract the second telescopic rod 105, allowing the roller 102 to overcome the obstacle, thus ensuring good obstacle-crossing capability.

[0070] Once the welding torch 210 is precisely aligned with the weld seam, the second controller receives the alignment completion signal from the detector and then controls the hydraulic cylinder to switch to the fourth state. The hydraulic cylinder is then activated, and its telescopic end extends outward, pushing the first ring 203 and the fourth ring 104 away from each other. Since the roller 102 and drive wheel 205 are now completely pressed against the inner wall of the circular tube 400, the first telescopic rod 206 and the second telescopic rod 105 cannot extend further outward. Simultaneously, the rotating frame 211 has rotational freedom, while the movable frame is a fixed structure; therefore, the thrust of the hydraulic cylinder cannot extend the telescopic rods, but only forces the first ring 203 to displace relative to the fourth ring 104. The pushing force applied by the hydraulic cylinder to the fourth ring 104 further increases the clamping force between the roller 102 and the inner wall of the tube, completely restricting the axial movement and circumferential rotation of the first through-tube 301, thus achieving locking and positioning of the first through-tube 301.

[0071] The specific transmission process is as follows: the first ring 203 moves towards the rotating frame 211, simultaneously driving the first hydraulic cylinder 207 to move, causing the hydraulic oil in the first space 241 to flow into the third space 243 through the first oil pipe, thereby driving the second ring 204 to move towards the movable frame. At the same time, the first ring 203 and the second ring 204 respectively drive the first connecting rod 201 they are equipped with to move, pushing the first sliding rod 220 to slide relative to the rotating frame 211. After overcoming the elastic resistance of the torsion spring 230, the first sliding rod 220 drives the rotating frame 211 to rotate in the forward direction, causing the moving component to switch from the initial first state to the second state.

[0072] Once the motion component is stable in the second state, the motor is restarted. The motor drives the drive wheel 205 to rotate. The drive wheel 205 transmits power through the first telescopic rod 206, causing the second through pipe 302 to rotate circumferentially relative to the first through pipe 301. At the same time, the second through pipe 302 drives the welding gun 210 to rotate synchronously, completing the circumferential welding operation of the weld seam.

[0073] During the welding process, the hydraulic cylinder continuously applies a pushing force to the first ring 203 and the fourth ring 104, keeping the roller 102 and drive wheel 205 tightly pressed against the inner wall of the circular tube column 400. This ensures that the first through pipe 301 does not rotate synchronously with the second through pipe 302, maintaining a fixed relative position between them. Furthermore, the static friction between the roller 102 and the circular tube column 400 restricts the relative axial movement of the two circular tube columns 400. During the cooling process of the weld after welding, the two circular tube columns 400 tend to slightly move closer together, causing the weld seam in the unwelded section to narrow. However, the static friction generated by the continuous pressing force applied by the hydraulic cylinder is sufficient to balance the cooling shrinkage force of the weld, effectively suppressing this relative movement and ensuring a stable weld gap, thus guaranteeing welding quality.

[0074] After welding is completed, the hydraulic cylinder retracts, causing the first ring 203 to reset. The first ring 203 then drives the second ring 204 to reset via the first transmission unit. The first ring 203 and the second ring 204 move away from each other, thereby causing the rotating frame 211 to rotate in the opposite direction until the first baffle 250 and the third baffle 252 abut against each other. The moving component then switches from the second state back to the first state. The next round of welding can then be performed.

[0075] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A circumferential welder for a circular tube column, disposed inside the circular tube column, characterized in that: It includes a first through pipe, a second through pipe, a welding gun, and a motion mechanism; both the first through pipe and the second through pipe are coaxially arranged with the circular pipe column and are distributed sequentially along the axial direction of the circular pipe column. The first through pipe and the second through pipe move synchronously, and the second through pipe can rotate relative to the first through pipe around its own axis. The motion mechanism includes a limiting component, a motion component, and a first adjusting component. The limiting component restricts the first tube from rotating about its own axis. The motion component includes at least two motion units distributed circumferentially along the second tube. Each motion unit includes a first telescopic rod and a drive wheel. The first telescopic rod is disposed on the outer wall of the second tube and is perpendicular to the outer wall of the second tube. A rotating frame is rotatably disposed at the end of the first telescopic rod away from the second tube. The drive wheel is rotatably disposed on the rotating frame and abuts against the inner wall of the circular tube column. The welding gun is disposed on the outer wall of the second tube. The motion component has a first state and a second state. In the first state, the axis of the drive wheel is tangentially arranged along the second through pipe. In the second state, the axis of the drive wheel is axially arranged along the second through pipe. When the motion component is in the first state, the rotation of the drive wheel can drive the first through pipe to move axially along the circular column, and the first through pipe drives the second through pipe to move synchronously. When the motion component is in the second state, the rotation of the drive wheel can drive the second through pipe to rotate relative to the first through pipe. The first adjustment component changes the direction of the axis of the drive wheel by rotating the rotating frame, thereby switching the motion component between the first state and the second state.

2. The circumferential welding equipment for a circular tube column according to claim 1, characterized in that: The first adjustment assembly is disposed on the second pipe. The first adjustment assembly includes two first adjustment units, which are respectively located on both sides of the rotating frame along the axial direction of the second pipe. Each first adjustment unit includes a first movable ring and at least two first connecting rods. The first movable ring and the second pipe are coaxially disposed and slidably disposed on the outside of the second pipe. Two first connecting rods are distributed circumferentially along the first movable ring, and the first connecting rods are inclined; one first connecting rod in each first adjustment unit corresponds to one motion unit; one end of each first connecting rod is rotatably connected to the first movable ring; the other end of each first connecting rod is provided with a first sliding rod, the first sliding rod is perpendicular to the axial direction of the first telescopic rod, and the first sliding rod is perpendicular to the direction of extension of the first connecting rod; each first sliding rod is rotatably connected to a rotating frame, and can slide relative to the rotating frame along the axial direction of the first sliding rod; when the two first movable rings approach each other, they can drive the first telescopic rod to extend through the first connecting rod.

3. The circumferential welding equipment for a circular tube column according to claim 2, characterized in that: Two first connecting rods on the same rotating frame are distributed along the circumference of the second through pipe; when the two first movable rings are far apart, the two first movable rings tend to drive the rotating frame to rotate in the opposite direction through the first connecting rods; when the two first movable rings are close to each other, the two first movable rings tend to drive the rotating frame to rotate in the forward direction through the first connecting rods. Each rotating frame is fixedly equipped with a first baffle, and each first telescopic rod is fixedly equipped with a second baffle and a third baffle at the end away from the second pipe; the first baffle and the second baffle are distributed sequentially along the circumference of the first telescopic rod; the third baffle abuts against the first baffle to restrict the reverse rotation of the rotating frame; A torsion spring is installed on the rotating frame, which connects the first baffle and the second baffle to prevent the rotating frame from rotating in the forward direction. When the force of the two first movable rings approaching each other overcomes the elastic force of the torsion spring, the rotating frame can rotate in the forward direction.

4. The circumferential welding equipment for a circular tube column according to claim 2, characterized in that: The two first movable rings are the first ring and the second ring, which are distributed sequentially along the direction from the first conduit to the second conduit. The first adjustment assembly further includes a first transmission unit, which includes a first hydraulic cylinder, a second hydraulic cylinder, and a first piston rod. The first hydraulic cylinder, the second hydraulic cylinder, and the first piston rod are all arranged along the axial direction of the second passage pipe. The first hydraulic cylinder is disposed on a first ring, the second hydraulic cylinder is disposed on a second ring, and the first piston rod is fixed inside the second passage pipe. Both ends of the first piston rod extend into the first hydraulic cylinder and the second hydraulic cylinder, respectively. A first piston is provided at the end of the first piston rod that extends into the first hydraulic cylinder, and the first piston divides the cavity inside the first hydraulic cylinder into a first space and a second space. A second piston is provided at the end of the first piston rod that extends into the second hydraulic cylinder, and the second piston divides the cavity inside the second hydraulic cylinder into a third space and a fourth space. The first space is connected to the third space, and the second space is connected to the fourth space. When the first ring moves the first hydraulic cylinder toward the direction of the rotating frame, the hydraulic oil in the first space enters the third space, which in turn moves the second hydraulic cylinder and the second ring toward the direction of the rotating frame.

5. The circumferential welding equipment for a circular tube column according to claim 4, characterized in that: The limiting assembly includes at least two limiting units, which are sequentially distributed along the circumference of the first through pipe. Each limiting unit includes a second telescopic rod and a roller. The second telescopic rod is radially along the first through pipe and is disposed on the outer side wall of the first through pipe. A connecting frame is disposed at the end of the second telescopic rod away from the first through pipe. The roller is rotatably disposed on the connecting frame, and the axis of the roller is disposed tangentially along the first channel. The roller is used to abut against the inner side wall of the circular pipe column.

6. The circumferential welding equipment for a circular tube column according to claim 5, characterized in that: The motion mechanism also includes a second adjustment assembly, which is disposed on the first through pipe. The second adjustment assembly includes two second adjustment units, which are respectively located on both sides of the connecting frame along the axial direction of the first through pipe. Each second adjustment unit includes a second movable ring and at least two second connecting rods. The second movable ring is coaxially arranged with the first through pipe and is slidably arranged on the outside of the first through pipe. One second link in each second adjustment unit corresponds to one motion unit; two second links are distributed circumferentially along the first movable ring, and the second links are inclined; one end of each second link is rotatably connected to the second movable ring; the other end of each second link is hinged to a connecting frame; when the two second movable rings approach each other, they can drive the second telescopic rod to extend through the second link.

7. The circumferential welding equipment for a circular tube column according to claim 6, characterized in that: The two second movable rings are the third ring and the fourth ring, which are distributed sequentially along the direction from the first conduit to the second conduit. The second adjustment assembly also includes a second transmission unit, which comprises a third hydraulic cylinder, a fourth hydraulic cylinder, and a second piston rod. The third hydraulic cylinder, fourth hydraulic cylinder, and second piston rod are all arranged axially along the first through pipe. The third hydraulic cylinder is mounted on a third ring, and the fourth hydraulic cylinder is mounted on a fourth ring. The second piston rod is fixed inside the first through pipe, with both ends extending into the third and fourth hydraulic cylinders, respectively. A third piston is located at the end of the second piston rod extending into the third hydraulic cylinder, dividing the cavity inside the third hydraulic cylinder into a fifth space and a sixth space. A fourth piston is located at the end of the second piston rod extending into the fourth hydraulic cylinder, dividing the cavity inside the fourth hydraulic cylinder into a seventh space and an eighth space. The fifth space communicates with the seventh space, and the sixth space communicates with the eighth space. When the third ring moves the third hydraulic cylinder toward the connecting frame, the hydraulic oil in the fifth space enters the seventh space, causing the fourth hydraulic cylinder and the fourth ring to move toward the connecting frame.

8. The circumferential welding equipment for a circular tube column according to claim 7, characterized in that: It also includes a drive mechanism, which includes a first drive assembly, which includes a tension spring. The tension spring is arranged along the axial direction of the first through pipe and is located inside the first through pipe and the second through pipe. The two ends of the tension spring are respectively connected to a third ring and a second ring. The tension spring is used to drive the third ring and the second ring to move closer to each other.

9. The circumferential welding equipment for a circular tube column according to claim 8, characterized in that: The drive mechanism also includes a second drive assembly, which includes a hydraulic cylinder arranged along the axial direction of the first through pipe. One end of the hydraulic cylinder is fixedly connected to the fourth ring, and the other end of the hydraulic cylinder is fixedly provided with a rotating ring. The rotating ring and the second through pipe are coaxially arranged, and the first ring and the rotating ring are rotatably connected. The second drive assembly has a third state and a fourth state. In the third state, the extended end of the hydraulic cylinder is allowed to extend and retract freely. In the fourth state, the extended end of the hydraulic cylinder extends or retracts under hydraulic pressure. When the motion assembly is in the first state, the second drive assembly is in the third state. When the motion assembly is in the second state, the second drive assembly is in the fourth state.

10. The circumferential welding equipment for a circular tube column according to claim 1, characterized in that: The motion component also includes at least one motor, which is fixedly mounted on a rotating frame; the output shaft of the motor is connected to the drive wheel.

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