A device for welding the inner wall of a large curvature radius elbow

Abstract

The invention discloses a device for welding the inner wall of a pipe bend with a large curvature radius, which relates to the field of pipe bend processing, and includes a frame, a first rotary drive mechanism, a displacement worktable and a rotary surfacing mechanism, wherein the first rotary drive mechanism is used to drive the displacement worktable to rotate; the rotary surfacing mechanism includes a second rotary drive component, a rotary base, a workpiece fixing fixture, a connecting frame, a connecting rod and a welding gun, wherein the second rotary drive component is used to drive the rotary base to rotate, and the workpiece fixing fixture is used to fix the pipe bend workpiece on the rotary base, and make the center of the circle of the pipe bend workpiece coincide with the first hinge point, and the first hinge point, the second hinge point, the third hinge point and the rotation center of the rotary base form a parallelogram; the welding gun includes an arc rod, a third rotary drive component, a rotary base and a welding assembly. The device for welding the inner wall of a pipe bend with a large curvature radius can avoid the problems of easy deformation of the pipe bend, easy leakage at the pipe joint and reduced pressure resistance level, thereby improving welding efficiency.

Description

Technical Field

[0001] The invention relates to the field of pipe bending processing, in particular to a device for surfacing the inner wall of a pipe bending with a large curvature radius. Background Art

[0002] The traditional welding method for large curvature radius elbows is to divide the elbow into several sections, weld the inner wall together, and then weld the sections together. The elbows welded in this way are easy to deform, the pipe joints are prone to leakage, the pressure resistance level is reduced, and there is also the problem of low welding efficiency. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a device for surfacing the inner wall of a large curvature radius elbow, which avoids the problems of easy deformation of the elbow, easy leakage at the pipeline joints and reduced pressure resistance level, thereby improving welding efficiency.

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] The present invention provides a device for surfacing welding the inner wall of a large curvature radius curved pipe, comprising a frame, a first rotating drive mechanism, a displacement worktable and a rotary surfacing mechanism, the displacement worktable being rotatably mounted on the frame, the first rotating drive mechanism being used to drive the displacement worktable to rotate, and the central axis around which the displacement worktable rotates is horizontally arranged; the rotary surfacing mechanism comprises a second rotating drive component, a rotary base, a workpiece fixing fixture, a connecting frame, a connecting rod and a welding gun, the second rotating drive component being arranged on the displacement worktable and being used to drive the rotary base to rotate, the central axis around which the rotary base rotates is perpendicular to the central axis around which the displacement worktable rotates, one end of the connecting frame being hinged on the rotary base to form a first hinge point, the first hinge point and the workpiece fixing fixture being respectively located at two ends of the rotation center of the rotary base, and the workpiece fixing fixture being used to displace the curved pipe The pipe workpiece is fixed on the rotating base, and the center of the bent pipe workpiece coincides with the first hinge point, the other end of the connecting frame is hinged to one end of the connecting rod to form a second hinge point, and the other end of the connecting rod is hinged to the displacement workbench to form a third hinge point, and the first hinge point, the second hinge point, the third hinge point and the rotation center of the rotating base form a parallelogram; the welding gun includes an arc rod, a third rotation driving component, a rotating base and a welding assembly, one end of the arc rod is connected to the connecting frame, the center of the arc rod coincides with the first hinge point, and the other end of the arc rod is provided with the third rotation driving component, the third rotation driving component is used to drive the rotating base to rotate, the central axis around which the rotating base rotates is tangent to the end of the central arc line of the arc rod, and the welding assembly is arranged on one side of the rotating base.

[0006] Preferably, two rotary surfacing welding mechanisms are provided, and the two rotary surfacing welding mechanisms are respectively arranged at the front and rear sides of the displacement workbench.

[0007] Preferably, the displacement workbench includes an intermediate frame and two supporting shafts respectively arranged at both ends of the intermediate frame, and one end of each supporting shaft away from the intermediate frame is rotatably installed on the frame, the first rotation drive mechanism includes two first rotation drive components, each of the first rotation drive components is used to drive one of the supporting shafts to rotate, the second rotation drive component is arranged on the intermediate frame, and one end of the connecting rod away from the connecting frame is hinged to one of the supporting shafts.

[0008] Preferably, the frame comprises two support frames, and one end of each support shaft away from the intermediate frame is rotatably mounted on one of the support frames.

[0009] Preferably, the first rotary drive assembly includes a first rotary drive component, a first driving gear and a first driven gear, the first rotary drive component is arranged on the support frame, the first rotary drive component is used to drive the first driving gear to rotate, the first driven gear is fixedly sleeved on the support shaft, and the first driven gear is meshed with the first driving gear.

[0010] Preferably, the first rotating driving component is a first rotating motor, and the first driving gear is fixedly sleeved on a power output shaft of the first rotating motor.

[0011] Preferably, the second rotary driving component is a second rotary motor, and the rotary base is fixedly sleeved on a power output shaft of the second rotary motor.

[0012] Preferably, the welding assembly includes a support plate, a swing driving component, an automatic wire feeder, a gun head and a ranging probe, the support plate is arranged on one side of the rotating base, the swing driving component is arranged on the support plate, the swing driving component is used to drive the automatic wire feeder to rotate, the central axis around which the automatic wire feeder rotates is perpendicular to the central axis around which the rotating base rotates, the gun head is arranged at one end of the automatic wire feeder away from the rotating base, and the ranging probe is arranged on the gun head.

[0013] Preferably, the gun head includes a gun head base, a gun head body, a water inlet pipe and a water outlet pipe, the gun head base is arranged at the end of the automatic wire feeder away from the rotating base, the ranging probe is arranged on the gun head base, the gun head body is arranged at the end of the gun head base away from the automatic wire feeder, a cooling chamber is arranged in the side wall of the gun head base, the water inlet pipe and the water outlet pipe are respectively arranged on both sides of the gun head base, and both are connected to the cooling chamber.

[0014] Preferably, it also includes a smoke collection pipe and a smoke treatment device, wherein the smoke treatment device is arranged on the displacement workbench, one end of the smoke collection pipe is connected to the smoke treatment device, and the other end is used to extend into the bent pipe workpiece.

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

[0016] The first rotary drive mechanism in the present invention is used to drive the displacement workbench to rotate, and then can drive the rotary surfacing mechanism to rotate. The rotary surfacing mechanism includes a second rotary drive component, a rotary base, a workpiece fixing fixture, a connecting frame, a connecting rod and a welding gun. The welding gun includes an arc rod, a third rotary drive component, a rotary base and a welding assembly. During welding, the position of the rotary surfacing mechanism is first adjusted by the first rotary drive mechanism, and then the position of the welding assembly is adjusted by the third rotary drive component. The second rotary drive component drives the rotary base to rotate, so that the welding assembly and the bent pipe workpiece produce relative movement, and then the inner wall of the bent pipe workpiece is welded by the welding assembly, so that the bent pipe workpiece with a large curvature radius can be welded as a whole without segmenting the bent pipe workpiece with a large curvature radius, avoiding the problems of easy deformation of the bent pipe, easy leakage at the pipe joint and reduced pressure resistance level, thereby improving welding efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. 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 creative work.

[0018] Figure 1 A three-dimensional structural diagram of the inner wall surfacing device of a large curvature radius elbow provided by the present invention;

[0019] Figure 2 A front view of the inner wall surfacing welding device for a large curvature radius elbow provided by the present invention in a welding state;

[0020] Figure 3 A front view of the inner wall surfacing welding device for a large curvature radius elbow provided by the present invention in a non-welding state;

[0021] Figure 4 A schematic diagram of the structure of a welding gun in a device for surfacing the inner wall of a large curvature radius elbow provided by the present invention;

[0022] Figure 5 A partial enlarged view of a welding gun in the device for surfacing the inner wall of a curved pipe with a large curvature radius provided by the present invention.

[0023] Explanation of the accompanying drawings: 100, device for surfacing the inner wall of a large curvature radius bent pipe; 1, support frame; 2, intermediate frame; 3, support shaft; 4, first rotating drive component; 5, first driving gear; 6, first driven gear; 7, rotating base; 8, rotation center; 9, connecting frame; 10, connecting rod; 11, first hinge point; 12, second hinge point; 13, third hinge point; 14, first clamp; 15, second clamp; 16, arc rod; 17, connecting base; 18, third rotating drive component; 19, rotating base; 20, support plate; 21, swinging drive component; 22, automatic wire feeder; 23, ranging probe; 24, gun head base; 25, gun head body; 26, water inlet pipe; 27, water outlet pipe; 28, flue gas collection pipe; 200, bent pipe workpiece. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0025] The purpose of the present invention is to provide a device for surfacing the inner wall of a large curvature radius elbow, so as to avoid the problems of easy deformation of the elbow, easy leakage at the pipeline joint and reduced pressure resistance level, thereby improving welding efficiency.

[0026] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] like Figure 1-Figure 5 As shown, this embodiment provides a large curvature radius elbow inner wall surfacing device 100, including a frame, a first rotary drive mechanism, a displacement worktable and a rotary surfacing mechanism, the displacement worktable is rotatably installed on the frame, the first rotary drive mechanism is used to drive the displacement worktable to rotate, the central axis around which the displacement worktable rotates is horizontally arranged, the rotary surfacing mechanism is installed on the displacement worktable, and the first rotary drive mechanism can drive the rotary surfacing mechanism to flip around the horizontal central axis.

[0028] The rotary cladding mechanism includes a second rotary drive component, a rotary base 7, a workpiece fixing fixture, a connecting frame 9, a connecting rod 10 and a welding gun. The second rotary drive component is arranged on the displacement workbench and is used to drive the rotary base 7 to rotate. The central axis around which the rotary base 7 rotates is perpendicular to the central axis around which the displacement workbench rotates. One end of the connecting frame 9 is hinged on the rotary base 7 to form a first hinge point 11. The first hinge point 11 and the workpiece fixing fixture are respectively located on both sides of the rotation center 8 of the rotary base 7. The workpiece fixing fixture is used to fix the bent pipe workpiece 200 on the rotary base 7, and make the center of the bent pipe workpiece 200 coincide with the first hinge point 11. The other end of the connecting frame 9 is hinged with one end of the connecting rod 10 to form a second hinge point 12. The other end of the connecting rod 10 is hinged with the displacement workbench to form a third hinge point 13. The first hinge point 11, the second hinge point 12, the third hinge point 13 and the rotation center 8 of the rotary base 7 form a parallelogram, that is, a parallelogram connecting rod mechanism is formed. The center of the bent pipe workpiece 200 is non-concentric with the rotation center 8 of the rotary base 7, that is, an eccentric structure is adopted to save space.

[0029] The welding gun includes an arc rod 16, a third rotation driving component 18, a rotating base 19 and a welding assembly. One end of the arc rod 16 is connected to the connecting frame 9, the center of the arc rod 16 coincides with the first hinge point 11, and the other end of the arc rod 16 is provided with a third rotation driving component 18. The third rotation driving component 18 is used to drive the rotating base 19 to rotate. The central axis around which the rotating base 19 rotates is tangent to the end of the central arc line of the arc rod 16, and the welding assembly is arranged on one side of the rotating base 19.

[0030] Specifically, two rotary cladding mechanisms are provided, and the two rotary cladding mechanisms are respectively provided at the front and rear sides of the position-shifting workbench. That is, the double-station design is adopted in this embodiment, and two bent pipe workpieces 200 can be welded at the same time, which is more efficient.

[0031] The displacement workbench includes an intermediate frame 2 and two support shafts 3 respectively arranged at both ends of the intermediate frame 2. One end of each support shaft 3 away from the intermediate frame 2 is rotatably installed on the frame. The first rotation drive mechanism includes two first rotation drive components, each first rotation drive component is used to drive a support shaft 3 to rotate. The second rotation drive component is arranged on the intermediate frame 2, and one end of the connecting rod 10 away from the connecting frame 9 is hinged on a support shaft 3.

[0032] The frame in this embodiment includes two support frames 1 , and one end of each support shaft 3 away from the middle frame 2 is rotatably mounted on one support frame 1 .

[0033] The first rotary drive assembly includes a first rotary drive component 4, a first driving gear 5 and a first driven gear 6. The first rotary drive component 4 is arranged on the support frame 1. The first rotary drive component 4 is used to drive the first driving gear 5 to rotate. The first driven gear 6 is fixedly sleeved on the support shaft 3, and the first driven gear 6 is meshed with the first driving gear 5.

[0034] When the displacement workbench and the rotary surfacing mechanism need to be turned over, the two first rotary drive components 4 work simultaneously to drive the first driving gear 5 to rotate, thereby causing the first driven gear 6 and the support shaft 3 to rotate.

[0035] In this specific embodiment, the first rotary driving component 4 is a first rotary motor, and the first driving gear 5 is fixedly sleeved on the power output shaft of the first rotary motor. The power output shaft of the first rotary motor is horizontally arranged.

[0036] In this specific embodiment, the second rotary drive component is a second rotary motor, and the rotary base 7 is fixedly mounted on the power output shaft of the second rotary motor. The central axis of the power output shaft of the second rotary motor is perpendicular to the central axis of the power output shaft of the first rotary motor.

[0037] In this specific embodiment, the third rotary drive component 18 is a third rotary motor, and the welding assembly further includes a connecting base 17, a second driving gear and a second driven gear. The connecting base 17 is fixed to the end of the arc rod 16 away from the connecting frame 9, and the rotating base 19 is rotatably mounted on the connecting base 17. The third rotary motor is arranged on the connecting base 17, and a second driving gear is fixedly sleeved on the power output shaft of the third rotary motor, and a second driven gear is fixedly sleeved on the rotating base 19, and the second driven gear is meshed with the second driving gear. A first through hole is arranged in the middle of the connecting base 17, and a second through hole is arranged in the middle of the rotating base 19.

[0038] When the welding position on the inner wall of the bent pipe workpiece 200 needs to be changed, the third rotating motor drives the second driving gear to rotate, thereby rotating the second driven gear and the rotating base 19, so that the relative position of the welding assembly and the inner wall of the bent pipe workpiece 200 changes, and the next surfacing work can be carried out.

[0039] like Figure 5 As shown, the welding assembly includes a support plate 20, a swing driving component 21, an automatic wire feeder 22, a gun head and a ranging probe 23. The support plate 20 is arranged on one side of the rotating base 19, and the swing driving component 21 is arranged on the support plate 20. The swing driving component 21 is used to drive the automatic wire feeder 22 to rotate. The central axis around which the automatic wire feeder 22 rotates is perpendicular to the central axis around which the rotating base 19 rotates. The gun head is arranged at one end of the automatic wire feeder 22 away from the rotating base 19, and the ranging probe 23 is arranged on the gun head.

[0040] This embodiment also includes a PLC controller, and the first rotary drive component 4, the second rotary drive component, the third rotary drive component 18 and the distance measuring probe 23 are all connected to the PLC controller, with a high degree of automation, so that one person can take care of multiple devices with low labor costs.

[0041] In this specific embodiment, the swing driving component 21 is a swing motor, and one end of the automatic wire feeder 22 is fixedly mounted on the power output shaft of the swing motor. The central axis of the power output shaft of the swing motor is perpendicular to the central axis of the power output shaft of the third rotating motor.

[0042] In this specific embodiment, the distance measuring probe 23 is an infrared distance measuring probe, which can realize 0-1.2 meter distance monitoring, with a monitoring accuracy of ±1 and a response time of 200ms.

[0043] When the bent pipe workpiece 200 includes a circular arc pipe section and two straight pipe sections, a single circular feeding motion cannot meet the welding of the straight pipe section. For this reason, in this embodiment, the intelligent compensation function is realized by cooperating with the swing driving component 21 and the distance measuring probe 23. The intelligent compensation function works as follows: the gun head is equipped with a distance measuring probe 23, and the gun head has a lifting function under the action of the swing driving component 21. The distance change between the gun head and the inner wall of the bent pipe workpiece 200 is monitored by the distance measuring probe 23, and the data is transmitted to the PLC controller. The PLC controller controls the swing driving component 21 through internal calculations to realize the automatic lifting function of the gun head to meet the set distance between the gun head and the inner wall of the bent pipe workpiece 200, so as to realize the welding of the straight pipe section.

[0044] When the bent pipe workpiece 200 is deformed or has protrusions or depressions on its inner wall, the distance measuring probe 23, the swing driving component 21 and the PLC controller work together to keep the gun head at a set distance from the inner wall of the bent pipe workpiece 200, thereby ensuring the welding effect.

[0045] The gun tip includes a gun tip base 24, a gun tip body 25, a water inlet pipe 26 and a water outlet pipe 27. The gun tip base 24 is arranged at the end of the automatic wire feeder 22 away from the rotating base 19, the ranging probe 23 is arranged on the gun tip base 24, the gun tip body 25 is arranged at the end of the gun tip base 24 away from the automatic wire feeder 22, a cooling chamber is arranged in the side wall of the gun tip base 24, and the water inlet pipe 26 and the water outlet pipe 27 are respectively arranged on both sides of the gun tip base 24, and both are connected to the cooling chamber.

[0046] Cold water is introduced into the cooling chamber through the water inlet pipe 26 and flows out through the water outlet pipe 27 after heat exchange, thereby cooling the gun head base 24 and reducing the impact of welding heat on the automatic wire feeder 22 and the distance measuring probe 23.

[0047] This embodiment also includes a welding power supply, which is used to supply power to the welding gun.

[0048] This embodiment also includes a fume collection pipe 28 and a fume treatment device. The fume treatment device is arranged on the displacement workbench. One end of the fume collection pipe 28 is connected to the fume treatment device, and the other end is used to extend into the bent pipe workpiece 200, thereby centrally collecting and treating the welding fume to ensure that the welding fume does not cause environmental pollution.

[0049] Specifically, the other end of the smoke collecting pipe 28 extends into the end of the curved pipe workpiece 200 away from the arc rod 16. The smoke treatment device in this example adopts the smoke treatment device in the prior art.

[0050] In the present embodiment, two rotary cladding mechanisms are provided, and two fume collecting pipes 28 are provided. One end of each fume collecting pipe 28 is connected to the fume treatment device, and the other end of each fume collecting pipe 28 extends into a bent pipe workpiece 200 on a rotary cladding mechanism.

[0051] Specifically, a plurality of workpiece fixing fixtures are provided, each of which includes a first fixture 14 and a second fixture 15. A first groove is provided on the side of the first fixture 14 close to the second fixture 15, and a second groove is provided on the side of the second fixture 15 close to the first fixture 14. The first fixture 14 is fixed to the rotary base 7 by a plurality of first bolts, and one side of the bent pipe workpiece 200 is placed in the first groove. The second fixture 15 is connected to the first fixture 14, and the other side of the bent pipe workpiece 200 is located in the second groove. The second fixture 15 is fixed to the first fixture 14 by a plurality of second bolts, and a plurality of workpiece fixing fixtures are used to fix and install the bent pipe workpiece 200. After the bent pipe workpiece 200 is fixed, the center of the bent pipe workpiece 200 is made to coincide with the first hinge point 11, and the central arc line of the bent pipe workpiece 200 is arranged cocircularly with the central arc line of the arc rod 16.

[0052] During operation, the bent pipe workpiece 200 to be welded is fixed on the rotary base 7 by the workpiece fixing fixture, the position of the rotary welding mechanism is first adjusted by the first rotary drive mechanism, and then the position of the welding assembly is adjusted by the third rotary drive component 18, that is, the position of the gun head body 25 is adjusted, and the second rotary drive component drives the rotary base 7 to rotate, so that the welding assembly and the bent pipe workpiece 200 produce relative movement, and then the inner wall of the bent pipe workpiece 200 is welded by the welding assembly, and the bent pipe workpiece 200 is welded from the starting point of the bent pipe workpiece 200 to the end of the bent pipe workpiece 200, so that the bent pipe workpiece 200 with a large curvature radius can be welded as a whole without dividing the bent pipe workpiece 200 with a large curvature radius, avoiding the problems of easy deformation of the bent pipe, easy leakage at the pipeline joints and reduced pressure resistance level, thereby improving welding efficiency.

[0053] Specifically, when the first weld is welded, the second rotary drive component drives the rotary base 7 to rotate in the opposite direction, so that the gun head body 25 returns to the starting point of the bent pipe workpiece 200. After that, the second weld is welded, and the relative position of the gun head body 25 and the inner wall of the bent pipe workpiece 200 needs to be adjusted. The third rotary drive component 18 drives the rotary base 19 to rotate, so that the relative position of the gun head body 25 and the inner wall of the bent pipe workpiece 200 changes, and then the next surfacing work can be carried out. The second rotary drive component drives the rotary base 7 to rotate, so that the gun head body 25 and the bent pipe workpiece 200 produce relative movement to realize the welding of the second weld. Repeat the above steps to realize the welding of multiple welds.

[0054] When it is necessary to perform surfacing welding on the inner wall of the bent pipe workpiece 200 near the first hinge point 11, in order to avoid overhead welding, the first rotating drive component 4 drives the displacement workbench and the rotary surfacing mechanism to flip 180 degrees, and adjust the position of the gun head body 25 so that the gun head body 25 is located above the inner wall of the bent pipe workpiece 200 to be welded, so as to ensure the welding effect.

[0055] In this embodiment, intelligent control of multi-axis simultaneous displacement can be achieved without secondary clamping, ensuring that the inner wall of the bent pipe workpiece 200 is in the optimal welding pool, with stable welding quality. It can be suitable for bent pipe workpieces 200 with different pipe diameters and different bending angles. The maximum pipe diameter of the bent pipe workpiece 200 is 28 inches, the maximum curvature radius is 3555mm, and the maximum bending angle is 90 degrees.

[0056] The present specification uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A device for surfacing the inner wall of a large curvature radius elbow, characterized in that: The machine comprises a frame, a first rotary drive mechanism, a displacement table and a rotary cladding mechanism, wherein the displacement table is rotatably mounted on the frame, the first rotary drive mechanism is used to drive the displacement table to rotate, and the central axis around which the displacement table rotates is horizontally arranged; the rotary cladding mechanism comprises a second rotary drive component, a rotary base, a workpiece fixing fixture, a connecting frame, a connecting rod and a welding gun, the second rotary drive component is arranged on the displacement table and is used to drive the rotary base to rotate, the central axis around which the rotary base rotates is perpendicular to the central axis around which the displacement table rotates, and one end of the connecting frame is hinged to the rotary base to form a The first hinge point, the first hinge point and the workpiece fixing fixture are respectively located at two ends of the rotation center of the rotating base, the workpiece fixing fixture is used to fix the bent pipe workpiece on the rotating base, and make the center of the bent pipe workpiece coincide with the first hinge point, the other end of the connecting frame is hinged to one end of the connecting rod to form a second hinge point, the other end of the connecting rod is hinged to the displacement workbench to form a third hinge point, the first hinge point, the second hinge point, the third hinge point and the rotation center of the rotating base form a parallelogram; the welding gun includes an arc rod, a third rotation driving component, a rotating base and a welding assembly, one end of the arc rod The end is connected to the connecting frame, the center of the arc rod coincides with the first hinge point, and the other end of the arc rod is provided with the third rotation driving component, and the third rotation driving component is used to drive the rotating base to rotate, and the central axis around which the rotating base rotates is tangent to the end of the central arc line of the arc rod, and the welding assembly is arranged on one side of the rotating base; the welding assembly includes a support plate, a swing driving component, an automatic wire feeder, a gun head and a ranging probe, the support plate is arranged on one side of the rotating base, the swing driving component is arranged on the support plate, and the swing driving component is used to drive the automatic wire feeder to rotate, and the automatic wire feeder The central axis about which the machine rotates is perpendicular to the central axis about which the rotating base rotates, the gun head is arranged at the end of the automatic wire feeder away from the rotating base, and the ranging probe is arranged on the gun head; the gun head includes a gun head base, a gun head body, a water inlet pipe and a water outlet pipe, the gun head base is arranged at the end of the automatic wire feeder away from the rotating base, the ranging probe is arranged on the gun head base, the gun head body is arranged at the end of the gun head base away from the automatic wire feeder, a cooling chamber is arranged in the side wall of the gun head base, the water inlet pipe and the water outlet pipe are respectively arranged on both sides of the gun head base, and both are connected to the cooling chamber.

2. The device for surfacing the inner wall of a large curvature radius elbow according to claim 1, characterized in that: The rotary surfacing welding mechanisms are provided in two, and the two rotary surfacing welding mechanisms are respectively provided at the front and rear sides of the displacement workbench.

3. The device for surfacing the inner wall of a large curvature radius elbow according to claim 1, characterized in that: The displacement workbench includes an intermediate frame and two supporting shafts respectively arranged at both ends of the intermediate frame, and one end of each supporting shaft away from the intermediate frame is rotatably installed on the frame. The first rotation drive mechanism includes two first rotation drive components, and each first rotation drive component is used to drive one of the supporting shafts to rotate. The second rotation drive component is arranged on the intermediate frame, and one end of the connecting rod away from the connecting frame is hinged to one of the supporting shafts.

4. The device for surfacing the inner wall of a large curvature radius elbow according to claim 3, characterized in that: The frame comprises two support frames, and one end of each support shaft away from the middle frame is rotatably mounted on one of the support frames.

5. The device for surfacing the inner wall of a large curvature radius elbow according to claim 4, characterized in that: The first rotary drive assembly includes a first rotary drive component, a first driving gear and a first driven gear. The first rotary drive component is disposed on the support frame. The first rotary drive component is used to drive the first driving gear to rotate. The first driven gear is fixedly sleeved on the support shaft. The first driven gear is meshed with the first driving gear.

6. The device for surfacing the inner wall of a large curvature radius elbow according to claim 5, characterized in that: The first rotating driving component is a first rotating motor, and the first driving gear is fixedly sleeved on a power output shaft of the first rotating motor.

7. The device for surfacing the inner wall of a large curvature radius elbow according to claim 1, characterized in that: The second rotating driving component is a second rotating motor, and the rotating base is fixedly sleeved on the power output shaft of the second rotating motor.

8. The device for surfacing the inner wall of a large curvature radius elbow according to claim 1, characterized in that: It also includes a smoke collection pipe and a smoke treatment device. The smoke treatment device is arranged on the displacement workbench. One end of the smoke collection pipe is connected to the smoke treatment device, and the other end is used to extend into the bent pipe workpiece.

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