Internal welding device for large steel pipe

Abstract

The invention discloses an internal welding device for a large steel pipe. The internal welding device comprises a welding platform, an L-shaped supporting plate is arranged on the welding platform, a conveying clamping mechanism is arranged on the welding platform, a positioning welding mechanism is arranged on the welding platform, and a deslagging supporting mechanism is arranged on the positioning welding mechanism; the conveying and clamping mechanism comprises a roller bracket, a conveying roller, a fixed supporting rod, an arc-shaped guide plate, a first universal ball and a clamping part; the clamping part is used for clamping a steel pipe; the positioning and welding mechanism comprises a motor support, a rotating motor, a driving shaft, a conveying frame, a welding part and an auxiliary part, the welding part is used for welding the joint of the two steel pipes, and the auxiliary part is used for positioning and supporting the conveying frame. The device has the beneficial effects that workers do not need to enter the steel pipe for welding, the labor intensity of the workers is reduced, the welding efficiency is improved, the welding quality is improved, the welding slag is convenient to clean, the grinding block is convenient to replace, and the dismounting and mounting efficiency is high.

Description

Technical Field

[0001] The present invention relates to the technical field of steel pipe welding, and more particularly to an internal welding device for large steel pipes. Background Art

[0002] Steel pipes have a hollow cross-section and are longer than their diameter. They can be used to transport liquids and powdered solids. In addition, they can be used to manufacture building frames, support columns, and mechanical supports. When using steel pipes, it is sometimes necessary to weld two steel pipes together.

[0003] The existing steel pipe welding device can only weld on the outside of the steel pipe. Generally, large steel pipes have thick walls. Welding from the outside alone is not firm and the welding quality is poor. Manual entry into the steel pipe is required for welding. Welding slag will be generated at the welding site, which needs to be manually polished. Welding and polishing are labor-intensive, time-consuming, and have low work efficiency.

[0004] It should be noted that the above contents belong to the technical knowledge of the inventor and do not necessarily constitute prior art. Summary of the invention

[0005] In view of the above defects, the present invention provides an internal welding device for large steel pipes to solve the above problems.

[0006] To achieve the above object, the present invention adopts the following technical solutions: An internal welding device for large steel pipes, comprising a welding platform, an L-shaped support plate is arranged on the welding platform, a vertical arm end of the L-shaped support plate is fixedly connected to one side of the welding platform surface, a horizontal arm end of the L-shaped support plate is located above the welding platform, a conveying and clamping mechanism is arranged on the welding platform, a positioning welding mechanism is arranged on the welding platform, and a slag removal support mechanism is arranged on the positioning welding mechanism; The conveying and clamping mechanism comprises a roller bracket, a conveying roller, a fixed support rod, an arc guide plate, a first universal ball and a clamping part. The roller bracket is installed on the surface of the welding platform. A plurality of roller brackets are provided. The conveying roller is rotatably connected to the roller bracket. Two groups of fixed support rods are provided. The two groups of fixed support rods are respectively located on the left and right sides of the conveying roller. The arc guide plate is installed on the top of the fixed support rod. The first universal ball is provided on the arc guide plate. The clamping part clamps the steel pipe. The positioning welding mechanism includes a motor bracket, a rotating motor, a driving shaft, a conveying frame, a welding part and an auxiliary part. The motor bracket is fixedly mounted on the vertical arm end of the L-shaped support plate, the rotating motor is mounted on the motor bracket, the driving shaft is mounted on the output end of the rotating motor, and the conveying frame is mounted on one end of the driving shaft. The welding part welds the connection between the two steel pipes, and the auxiliary part positions and supports the conveying frame.

[0007] Furthermore, the clamping part includes two groups of clamping cylinders installed on the L-shaped support plate, and the two groups of clamping cylinders are respectively located on both sides of the bottom of the horizontal arm end of the L-shaped support plate. A lifting top plate is installed on the telescopic end of each group of clamping cylinders, and rubber clamping blocks are installed on both sides of the bottom of the lifting top plate, and the bottom surface of the rubber clamping block is arc-shaped.

[0008] Furthermore, the welding part includes a threaded screw rotatably connected to the conveying frame, a driving motor is installed at one end of the conveying frame away from the driving shaft, the output end of the driving motor is fixedly connected to one end of the threaded screw, a movable slider is threadedly connected to the threaded screw, both sides of the movable slider are slidably connected to the inner wall of the conveying frame, a welding power push rod is installed at the bottom of the movable slider, a fixed plate is installed on the telescopic end of the welding power push rod, and a welding head is installed on the fixed plate.

[0009] Furthermore, the auxiliary part includes auxiliary power push rods installed on both sides of one end of the conveying frame, the two auxiliary power push rods are located at the end of the conveying frame away from the driving shaft, and an arc-shaped auxiliary plate is installed on the telescopic end of the auxiliary power push rod. A plurality of second universal ball bearings are provided on the arc-shaped auxiliary plate, and the second universal ball bearings are in contact with the inner wall of the steel pipe.

[0010] Furthermore, the slag removal support mechanism includes a multi-stage telescopic cylinder fixedly installed on the top of the moving slider, a clamping block is installed on the telescopic end of the multi-stage telescopic cylinder, a grinding block is clamped on the clamping block, one end of the grinding block protrudes from the clamping block, the protruding part of the grinding block is in contact with the inner wall of the steel pipe, and a supporting block is installed on the welding platform, the supporting block is located between the two roller brackets, and the concave part of the supporting block is consistent with the protruding part of the grinding block.

[0011] Furthermore, a fastening screw is threadedly connected to one side of the clamping block, one end of the fastening screw passes through the side wall of the clamping block, a fixed bearing is installed on one end of the fastening screw passing through the clamping block, a clamping plate is installed on one side of the fixed bearing, the inner ring of the fixed bearing is fixedly connected to the fastening screw, and the outer ring of the fixed bearing is fixedly connected to the clamping plate.

[0012] Furthermore, a video probe is installed on the fixing plate, the video probe and the welding head are on the same horizontal line, a universal bracket is installed on the L-shaped supporting plate, and a video display is installed at one end of the universal bracket.

[0013] Furthermore, an electric slip ring is installed on the driving shaft, and connecting wires on the electric slip ring are respectively connected to multiple electrical devices on the conveying frame.

[0014] Furthermore, a fixed support rod is installed on one end of the welding platform surface away from the L-shaped support plate, and the top end of the fixed support rod is fixedly connected to the cross arm end of the L-shaped support plate.

[0015] The beneficial effects of the present invention are as follows: the rubber clamping block is driven to descend and contact the outer wall of the steel pipe by the clamping cylinder, the bottom surface of the rubber clamping block is arc-shaped and the rubber material is relatively soft, the rubber clamping block can be completely fitted with the steel pipe and has good friction, the clamping and fixing effect is good, the rotation position of the steel pipe is prevented from being offset, the stability is increased, and the welding quality is improved; The conveyor frame drives the welding part to rotate, and the welding head is used to weld the joints of the two steel pipes. There is no need for manual entry into the steel pipes for welding, which reduces the labor intensity, improves the welding efficiency, and improves the welding quality. The auxiliary part supports the conveyor frame during welding, so that the conveyor frame can rotate smoothly, avoiding bending and deformation of the drive shaft and the conveyor frame, and prolonging the service life; The conveyor frame can be supported by the multi-stage telescopic cylinder, the clamping concave block and the grinding block, and the slag of the welding part can be removed at the same time. The welding part can be polished by the grinding block to eliminate the welding slag generated by welding, which is convenient for cleaning the welding slag and improves the welding quality. It is convenient to replace the grinding block, the disassembly and assembly efficiency is high, and the slag removal effect is improved.

[0016] The video probe and video display make it easy to find the welding position, the welding position is accurate, and the welding quality is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of an internal welding device for a large steel pipe according to the present invention; Figure 2 is a side view of the present invention; Figure 3 It is the welding state diagram of the positioning welding mechanism; Figure 4 is a slag removal state diagram of the slag removal support mechanism; Figure 5 is an enlarged top view of the conveyor frame; Figure 6 is a front cross-sectional view of the conveyor frame; Figure 7 yes Figure 2 The enlarged view of point A in the middle; In the figure, 1, welding platform; 2, L-shaped support plate; 3, roller bracket; 4, conveying roller; 5, fixed support rod; 6, arc guide plate; 7, first universal ball; 8, clamping part; 9, motor bracket; 10, rotating motor; 11, driving shaft; 12, conveying frame; 13, welding part; 14, auxiliary part; 15, clamping cylinder; 16, lifting top plate; 17, rubber clamping block; 18, threaded screw; 19, driving motor; 20, moving slide Block; 21. Welding power push rod; 22. Fixed plate; 23. Welding head; 24. Auxiliary power push rod; 25. Arc auxiliary plate; 26. Second universal ball; 27. Multi-stage telescopic cylinder; 28. Clamping concave block; 29. ​​Grinding block; 30. Supporting concave block; 31. Fastening screw; 32. Fixed bearing; 33. Clamping plate; 34. Video probe; 35. Universal bracket; 36. Video display; 37. Electric slip ring; 38. Fixed support rod. DETAILED DESCRIPTION

[0018] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0019] The present application embodiment provides an internal welding device for large steel pipes, please refer to Figure 1-Figure 7 : It includes a welding platform 1, an L-shaped support plate 2 is provided on the welding platform 1, the vertical arm end of the L-shaped support plate 2 is fixedly connected to one side of the surface of the welding platform 1, the horizontal arm end of the L-shaped support plate 2 is located above the welding platform 1, a conveying and clamping mechanism is provided on the welding platform 1, a positioning welding mechanism is provided on the welding platform 1, and a slag removal support mechanism is provided on the positioning welding mechanism; The conveying and clamping mechanism includes a roller bracket 3, a conveying roller 4, a fixed support rod 5, an arc guide plate 6, a first universal ball 7 and a clamping portion 8. The roller bracket 3 is installed on the surface of the welding platform 1. A plurality of roller brackets 3 are provided. The conveying roller 4 is rotatably connected to the roller bracket 3. Two groups of fixed support rods 5 are provided. The two groups of fixed support rods 5 are respectively located on the left and right sides of the conveying roller 4. The arc guide plate 6 is installed on the top of the fixed support rod 5. The first universal ball 7 is provided on the arc guide plate 6. The clamping portion 8 clamps the steel pipe. The positioning welding mechanism includes a motor bracket 9, a rotating motor 10, a driving shaft 11, a conveying frame 12, a welding part 13 and an auxiliary part 14. The motor bracket 9 is fixedly mounted on the vertical arm end of the L-shaped support plate 2, the rotating motor 10 is mounted on the motor bracket 9, the driving shaft 11 is mounted on the output end of the rotating motor 10, the conveying frame 12 is mounted on one end of the driving shaft 11, the welding part 13 welds the connection between the two steel pipes, and the auxiliary part 14 positions and supports the conveying frame 12.

[0020] Specifically, in practical applications, when welding two steel pipes together, the steel pipe is placed on the conveying roller 4, and the steel pipe is pushed to move on the conveying roller 4. The side of the steel pipe contacts the first universal ball 7 on the arc guide plate 6. The steel pipe is guided by the arc guide plate 6 and the first universal ball 7 to prevent the steel pipe from falling from the conveying roller 4, thereby improving safety and facilitating the conveying of the steel pipe. After the two steel pipes are conveyed and docked, the two steel pipes are clamped by the clamping part 8 to prevent the rotation position of the steel pipe from being offset, thereby increasing stability and improving welding quality. After the steel pipe is clamped and fixed, the conveying frame 12 is located at the center of the steel pipe, and the conveying frame 12 is positioned and supported by the auxiliary part 14 to avoid bending and deformation of the drive shaft 11 and the conveying frame 12, thereby increasing the service life. The rotating motor 10 starts to work, and the output end of the rotating motor 10 drives the conveying frame 12 to rotate through the drive shaft 11, and the connection between the two steel pipes is welded through the welding part 13.

[0021] Refer to the instruction manual Figure 1 , Instruction Manual Figure 2 And the instruction manual Figure 3 The clamping part 8 includes two groups of clamping cylinders 15 installed on the L-shaped support plate 2. The two groups of clamping cylinders 15 are respectively located on both sides of the bottom of the horizontal arm end of the L-shaped support plate 2. A lifting top plate 16 is installed on the telescopic end of each group of clamping cylinders 15. Rubber clamping blocks 17 are installed on both sides of the bottom of the lifting top plate 16. The bottom surface of the rubber clamping block 17 is arc-shaped.

[0022] Specifically in practical applications, after the two steel pipes are butt-jointed, the clamping cylinder 15 starts to work, and the telescopic end of the clamping cylinder 15 extends to drive the lifting top plate 16 to descend, and the lifting top plate 16 drives the rubber clamping block 17 to descend. The rubber clamping block 17 descends and contacts the outer wall of the steel pipe. The bottom surface of the rubber clamping block 17 is arc-shaped and the rubber material is relatively soft. The rubber clamping block 17 can fit the steel pipe completely and has good friction. The clamping and fixing effect is good, which avoids the rotation position of the steel pipe from being offset, increases stability, and improves welding quality.

[0023] Refer to the instruction manual Figure 3 , Instruction Manual Figure 5 And the instruction manual Figure 6The welding part 13 includes a threaded screw 18 rotatably connected to the conveying frame 12, a driving motor 19 is installed at one end of the conveying frame 12 away from the driving shaft 11, the output end of the driving motor 19 is fixedly connected to one end of the threaded screw 18, a moving slider 20 is threadedly connected to the threaded screw 18, both sides of the moving slider 20 are slidably connected to the inner wall of the conveying frame 12, a welding power push rod 21 is installed at the bottom of the moving slider 20, a fixed plate 22 is installed on the telescopic end of the welding power push rod 21, and a welding head 23 is installed on the fixed plate 22.

[0024] Specifically in practical applications, after the steel pipe is clamped and fixed and the auxiliary part 14 is fixed, the conveying frame 12 is located at the center of the steel pipe, and the driving motor 19 starts to work. The output end of the driving motor 19 drives the threaded screw 18 to rotate. The threaded screw 18 rotates and drives the moving slider 20 to slide along the inner wall of the conveying frame 12. The moving slider 20 drives the welding power push rod 21 and the welding head 23 to move, and moves the welding head 23 to the connection between the two steel pipes. The welding power push rod 21 starts to work, and the telescopic end of the welding power push rod 21 extends into and drives the fixed plate 22 and the welding head 23 to move, so that the welding head 23 contacts the connection between the two steel pipes. The welding head 23 starts to work and starts to work through the rotating motor 10. The output end of the rotating motor 10 drives the conveying frame 12 to rotate through the driving shaft 11, and the conveying frame 12 drives the welding part 13 to rotate, and the connection between the two steel pipes is welded through the welding head 23, and there is no need to manually enter the steel pipe for welding, which reduces the labor intensity, improves the welding efficiency, and improves the welding quality.

[0025] Refer to the instruction manual Figure 2 , Instruction Manual Figure 3 And the instruction manual Figure 5 The auxiliary part 14 includes auxiliary power push rods 24 installed on both sides of one end of the conveying frame 12. The two auxiliary power push rods 24 are located at the end of the conveying frame 12 away from the driving shaft 11. An arc-shaped auxiliary plate 25 is installed on the telescopic end of the auxiliary power push rod 24. A plurality of second universal balls 26 are provided on the arc-shaped auxiliary plate 25. The second universal balls 26 are in contact with the inner wall of the steel pipe.

[0026] Specifically in actual applications, the auxiliary power push rod 24 starts to work, and the telescopic end of the auxiliary power push rod 24 extends to drive the arc-shaped auxiliary plate 25 to move, and the second universal ball 26 on the arc-shaped auxiliary plate 25 fits with the inner wall of the steel pipe. When the conveying frame 12 rotates, the conveying frame 12 drives the auxiliary power push rod 24 and the arc-shaped auxiliary plate 25 to rotate, and the second universal ball 26 fits with the inner wall of the steel pipe, which increases the degree of rotation flow, can support the conveying frame 12, avoid bending and deformation of the drive shaft 11 and the conveying frame 12, and improve the service life.

[0027] Refer to the instruction manual Figure 1 , Instruction Manual Figure 2And the instruction manual Figure 4 The slag removal support mechanism includes a multi-stage telescopic cylinder 27 fixedly installed on the top of the moving slider 20, a clamping concave block 28 is installed on the telescopic end of the multi-stage telescopic cylinder 27, a grinding block 29 is clamped on the clamping concave block 28, one end of the grinding block 29 protrudes from the clamping concave block 28, and the protruding portion of the grinding block 29 is in contact with the inner wall of the steel pipe. A supporting concave block 30 is installed on the welding platform 1, and the supporting concave block 30 is located between the two roller brackets 3, and the concave portion of the supporting concave block 30 is consistent with the protruding portion of the grinding block 29.

[0028] Specifically, in practical applications, when the steel pipe is conveyed on the conveying roller 4, the supporting concave block 30 is closely fitted with the supporting concave block 30, and one end of the grinding block 29 protrudes from the clamping concave block 28 and is located in the concave portion of the supporting concave block 30. The conveying frame 12 is supported by the clamping concave block 28 and the multi-stage telescopic cylinder 27 to prevent the driving shaft 11 and the conveying frame 12 from bending and deforming. When the steel pipe approaches the multi-stage telescopic cylinder 27, the auxiliary part 14 starts to work, and the conveying frame 12 is supported by the auxiliary part 14. The multi-stage telescopic cylinder 27 starts to work, and the telescopic end of the multi-stage telescopic cylinder 27 contracts to drive the clamping concave block 28 to move, and the multi-stage telescopic cylinder 27 contracts to the maximum At the small stroke, the steel pipe continues to be pushed on the conveying roller 4 for conveying. The steel pipe can continue to be conveyed through the second universal ball 26 on the auxiliary part 14. After the welding is completed and the welding part 13 is reset, the telescopic end of the multi-stage telescopic cylinder 27 extends into and drives the clamping concave block 28 to move, so that the grinding block 29 on the clamping concave block 28 fits with the inner wall of the steel pipe, and the rotating motor 10 starts to work. The output end of the rotating motor 10 drives the conveying frame 12 to rotate through the driving shaft 11, and the conveying frame 12 drives the slag removal support mechanism to rotate. The welding part is polished by the grinding block 29 to eliminate the welding slag generated by welding, which is convenient for cleaning the welding slag and improves the welding quality.

[0029] Refer to the instruction manual Figure 7 A fastening screw 31 is threadedly connected to one side of the clamping recess 28, and one end of the fastening screw 31 passes through the side wall of the clamping recess 28. A fixed bearing 32 is installed on one end of the fastening screw 31 that passes through the clamping recess 28, and a clamping plate 33 is installed on one side of the fixed bearing 32. The inner ring of the fixed bearing 32 is fixedly connected to the fastening screw 31, and the outer ring of the fixed bearing 32 is fixedly connected to the clamping plate 33.

[0030] Specifically in actual applications, when the grinding block 29 needs to be replaced, the fastening screw 31 is loosened, and the fastening screw 31 drives the clamping plate 33 away from the grinding block 29 through the fixed bearing 32, and the grinding block 29 to be replaced is taken out from the clamping recess 28, and the new grinding block 29 is installed in the clamping recess 28, and the fastening screw 31 is tightened, and the fastening screw 31 drives the clamping plate 33 close to the grinding block 29 through the fixed bearing 32, and the grinding block 29 is clamped in the clamping recess 28 through the clamping plate 33, which facilitates the replacement of the grinding block 29, has high disassembly and assembly efficiency, and improves the slag removal effect.

[0031] Refer to the instruction manual Figure 1 And the instruction manual Figure 2 A video probe 34 is installed on the fixing plate 22, and the video probe 34 and the welding head 23 are on the same horizontal line. A universal bracket 35 is installed on the L-shaped supporting plate 2, and a video display 36 is installed at one end of the universal bracket 35.

[0032] Specifically in practical applications, when the welding head 23 moves to find the welding position, the video probe 34 starts to work. The video probe 34 captures the image inside the steel pipe and displays the video on the video display 36, which facilitates finding the welding position, accurately positions the welding, and improves the welding quality.

[0033] Refer to the instruction manual Figure 5 An electric slip ring 37 is installed on the driving shaft 11, and the connecting wires on the electric slip ring 37 are respectively connected to multiple electrical devices on the conveying frame 12.

[0034] Specifically in practical applications, the electric slip ring 37 is used to supply power to multiple electrical devices on the conveyor frame 12 without affecting the rotation of the devices.

[0035] Refer to the instruction manual Figure 1 And the instruction manual Figure 2 A fixed support rod 38 is installed on one end of the surface of the welding platform 1 away from the L-shaped support plate 2, and the top end of the fixed support rod 38 is fixedly connected to the cross arm end of the L-shaped support plate 2.

[0036] Specifically, in practical applications, the cross arm end of the L-shaped support plate 2 is supported by fixing the support rod 38 to prevent the L-shaped support plate 2 from being bent, deformed or damaged.

[0037] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0038] The above embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

[0039] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0040] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0041] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0043] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

Claims

1. An internal welding device for a large steel pipe, comprising a welding platform (1), an L-shaped support plate (2) being provided on the welding platform (1), a vertical arm end of the L-shaped support plate (2) being fixedly connected to one side of the surface of the welding platform (1), and a horizontal arm end of the L-shaped support plate (2) being located above the welding platform (1), characterized in that: The welding platform (1) is provided with a conveying and clamping mechanism, the welding platform (1) is provided with a positioning welding mechanism, and the positioning welding mechanism is provided with a slag removal support mechanism; The conveying and clamping mechanism comprises a roller bracket (3), a conveying roller (4), a fixed support rod (5), an arc guide plate (6), a first universal ball (7) and a clamping portion (8), wherein the roller bracket (3) is mounted on the surface of the welding platform (1), a plurality of roller brackets (3) are provided, the conveying roller (4) is rotatably connected to the roller bracket (3), two groups of fixed support rods (5) are provided, the two groups of fixed support rods (5) are respectively located on the left and right sides of the conveying roller (4), the arc guide plate (6) is mounted on the top of the fixed support rod (5), the first universal ball (7) is provided on the arc guide plate (6), and the clamping portion (8) clamps the steel pipe; The positioning welding mechanism comprises a motor bracket (9), a rotating motor (10), a driving shaft (11), a conveying frame (12), a welding part (13) and an auxiliary part (14); the motor bracket (9) is fixedly mounted on the vertical arm end of the L-shaped support plate (2); the rotating motor (10) is mounted on the motor bracket (9); the driving shaft (11) is mounted on the output end of the rotating motor (10); the conveying frame (12) is mounted on one end of the driving shaft (11); the welding part (13) is used to weld the connection between the two steel pipes; and the auxiliary part (14) is used to position and support the conveying frame (12).

2. The internal welding device for large steel pipes according to claim 1, characterized in that: The clamping portion (8) comprises two groups of clamping cylinders (15) mounted on the L-shaped support plate (2), the two groups of clamping cylinders (15) being respectively located on both sides of the bottom of the horizontal arm end of the L-shaped support plate (2), a lifting top plate (16) being mounted on the telescopic end of each group of clamping cylinders (15), and rubber clamping blocks (17) being mounted on both sides of the bottom of the lifting top plate (16), the bottom surface of the rubber clamping block (17) being arc-shaped.

3. The internal welding device for large steel pipes according to claim 1, characterized in that: The welding portion (13) comprises a threaded screw (18) rotatably connected to the conveying frame (12); a driving motor (19) is installed at one end of the conveying frame (12) away from the driving shaft (11); an output end of the driving motor (19) is fixedly connected to one end of the threaded screw (18); a movable slider (20) is threadedly connected to the threaded screw (18); two sides of the movable slider (20) are slidably connected to the inner wall of the conveying frame (12); a welding power push rod (21) is installed at the bottom of the movable slider (20); a fixed plate (22) is installed on the telescopic end of the welding power push rod (21); and a welding head (23) is installed on the fixed plate (22).

4. The internal welding device for large steel pipes according to claim 3, characterized in that: The auxiliary part (14) comprises auxiliary power push rods (24) installed on both sides of one end of the conveying frame (12), the two auxiliary power push rods (24) are located at the end of the conveying frame (12) away from the driving shaft (11), and an arc-shaped auxiliary plate (25) is installed on the telescopic end of the auxiliary power push rod (24), and a plurality of second universal balls (26) are provided on the arc-shaped auxiliary plate (25), and the second universal balls (26) are in contact with the inner wall of the steel pipe.

5. The internal welding device for large steel pipes according to claim 1, characterized in that: The slag removal support mechanism comprises a multi-stage telescopic cylinder (27) fixedly mounted on the top of the movable slider (20); a clamping concave block (28) is mounted on the telescopic end of the multi-stage telescopic cylinder (27); a grinding block (29) is clamped on the clamping concave block (28); one end of the grinding block (29) protrudes from the clamping concave block (28); a protruding portion of the grinding block (29) is in contact with the inner wall of the steel pipe; a supporting concave block (30) is mounted on the welding platform (1); the supporting concave block (30) is located between the two roller brackets (3); a concave portion of the supporting concave block (30) is in contact with a protruding portion of the grinding block (29).

6. The internal welding device for large steel pipes according to claim 5, characterized in that: A fastening screw (31) is threadedly connected to one side of the clamping concave block (28), one end of the fastening screw (31) passes through the side wall of the clamping concave block (28), a fixed bearing (32) is installed on one end of the fastening screw (31) that passes through the clamping concave block (28), a clamping plate (33) is installed on one side of the fixed bearing (32), an inner ring of the fixed bearing (32) is fixedly connected to the fastening screw (31), and an outer ring of the fixed bearing (32) is fixedly connected to the clamping plate (33).

7. The internal welding device for large steel pipes according to claim 3, characterized in that: A video probe (34) is mounted on the fixing plate (22), and the video probe (34) and the welding head (23) are on the same horizontal line. A universal bracket (35) is mounted on the L-shaped supporting plate (2), and a video display (36) is mounted on one end of the universal bracket (35).

8. The internal welding device for large steel pipes according to claim 1, characterized in that: An electric slip ring (37) is installed on the driving shaft (11), and connecting wires on the electric slip ring (37) are respectively connected to a plurality of electrical devices on the conveying frame (12).

9. The internal welding device for large steel pipes according to claim 1, characterized in that: A fixed support rod (38) is installed on one end of the surface of the welding platform (1) away from the L-shaped support plate (2), and the top end of the fixed support rod (38) is fixedly connected to the cross arm end of the L-shaped support plate (2).

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