Automatic welding device for large-diameter steel pipe flange plate

Abstract

The invention relates to the technical field of flange plate welding, in particular to an automatic large-diameter steel pipe and flange plate welding device which solves the problems that in the welding process of a steel pipe and a flange plate, the rotating efficiency and stability are insufficient, and the automatic large-diameter steel pipe and flange plate welding device comprises a frame base and a welding mechanism. A clamping mechanism penetrating through a steel pipe is arranged on the frame seat, a transmission structure is arranged between the electric roller carrier and the clamping mechanism, and when the electric roller carrier runs, the transmission structure drives the clamping mechanism pressing the inner wall of the steel pipe to rotate synchronously, so that the inner wall and the outer wall of the steel pipe are subjected to torque action in the same direction; the clamping mechanism comprises a round rod coinciding with the axis of the steel pipe, and an air cylinder clamp is installed on the end face of the rear side of the round rod. The inner side and the outer side of the steel pipe can be subjected to rotating torque in the same direction, dual driving is achieved, the rotating efficiency and stability of the steel pipe can be effectively improved, and therefore the subsequent welding effect of the steel pipe and a flange plate is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of flange welding, in particular to an automatic welding device for a large-diameter steel pipe flange. Background Art

[0002] The conventional operation for welding steel pipes and flanges is to place the steel pipe on a roller frame, and through the rotation of the roller frame, drive the steel pipe and flange placed on it to rotate, and cooperate with the welding mechanism set at the set point to perform a full circle of welding operation on the joint between the steel pipe and the flange.

[0003] However, in conventional operation, only the outer wall of the steel pipe is affected by the rotational torque of the roller frame, so the rotational friction force on the steel pipe is uneven, the rotational inertia is large, the torque transmission efficiency is low, and there may be local deformation, resulting in unsatisfactory rotation effect of the steel pipe. Summary of the invention

[0004] In view of the deficiencies in the prior art, the purpose of the present invention is to provide an automatic welding device for large-diameter steel pipe flanges to solve the problems of insufficient rotation efficiency and stability during the welding of steel pipes and flanges mentioned in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an automatic welding device for large-diameter steel pipe flanges, comprising a frame seat and a welding mechanism, wherein an electric roller frame for driving the steel pipe to rotate circumferentially is installed on the frame seat, a clamping mechanism passing through the steel pipe is provided on the frame seat, and a transmission structure is provided between the electric roller frame and the clamping mechanism. When the electric roller frame is operated, the transmission structure drives the clamping mechanism pressing the inner wall of the steel pipe to rotate synchronously, so that the inner wall and the outer wall of the steel pipe are both subjected to torque in the same direction; The clamping mechanism comprises a round rod coinciding with the axis of the steel pipe, a cylinder clamp is installed on the rear end face of the round rod, the cylinder clamp consists of a clamp body and two clamp heads, a lifting bearing frame is sleeved on the surface of the round rod, and a docking assembly is installed on the rear sides of the two clamp heads; The docking assembly comprises a telescopic structure, a connecting plate is installed between the front side of the telescopic structure and the rear side of the clamp head, and a plug-in column with a length consistent with the thickness of the steel pipe is installed on the front side of the telescopic structure.

[0006] Preferably, the telescopic structure includes a U-shaped plate, which is installed on the rear side of the connecting plate, an extension plate is slidably installed inside the U-shaped plate, the plug-in column is installed on the front side of the extension plate, a slot is opened on the top of the extension plate, and a limiting vertical plate is installed between the top wall and the bottom wall of the U-shaped plate, and the limiting vertical plate is arranged through the slot.

[0007] Preferably, a threaded screw is rotatably installed between the U-shaped plate and the limiting vertical plate, and the threaded screw is rotatably connected to the extension plate.

[0008] Preferably, the electric roller rack includes two shaft rods installed on the top of the frame base through bearing seats. A support wheel disc is fixedly sleeved on the outer surface of the shaft rods. A driving motor is installed on the frame base. A first belt drive is installed between the output end of the driving motor and the two shaft rods.

[0009] Preferably, the transmission structure includes a positioning frame installed on the top edge of the frame base. A rotating shaft is rotatably installed on the positioning frame. Straight gears are installed on the outer surfaces of the rotating shaft and one of the shaft rods, and the two straight gears mesh with each other. A second belt drive is detachably installed between the rotating shaft and the round rod.

[0010] Preferably, the lifting bearing frame includes a double bearing kit sleeved on the surface of the round rod. A first hydraulic cylinder is installed between the double bearing kit and the frame base.

[0011] Preferably, a second hydraulic cylinder is installed on the frame base. A supporting plate for supporting the flange is installed at the top end of the second hydraulic cylinder.

[0012] Preferably, an electric pushing structure is also installed on the frame base, which is used to push the steel pipe and the flange from front to back so that the connection part between them corresponds to the welding station of the welding mechanism.

[0013] By means of the above technical solutions, the present invention provides an automatic welding device for large-diameter steel pipe flanges, which has at least the following beneficial effects: 1. Through the coordinated operation of the electric roller rack, the transmission structure and the clamping mechanism, the present invention can make the inner and outer sides of the steel pipe receive the rotational torque in the same direction, realizing double drive, which can effectively improve the rotation efficiency and stability of the steel pipe, thus ensuring the welding effect of the subsequent steel pipe and flange.

[0014] 2. By applying the rotational torque on the inner and outer sides of the steel pipe with the same driving source, the present invention can enhance the driving reliability, prevent slipping, improve the control accuracy and reduce deformation.

[0015] 3. During the welding process, the present invention can ensure that the steel pipe and the flange rotate in the same frequency and in the same direction, thus effectively eliminating the relative movement between them, making the welding point relatively stationary, the molten pool stable, ensuring that the subsequent weld bead is more uniform in shape, and in addition, continuous welding can be realized to improve the efficiency.

[0016] 4. Through the cooperation of two straight gears, the rotation direction of the rotating shaft is opposite to that of the shaft rod. In addition, with the cooperation of the second belt drive, the round rod is controlled to rotate in the same direction as the rotating shaft, which is also the same as the rotation direction of the steel pipe under the action of the electric roller rack, so as to ensure that the torsional torques received on the inner and outer sides of the steel pipe are in the same direction. Description of the Drawings

[0017] The accompanying drawings described herein are used to provide a further understanding of the present application and form a part of the present application. The schematic embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation of the present application. In the drawings: Figure 1 is a schematic diagram of the overall structure of the present invention; Figure 2 is a schematic diagram of the installation structure of the electric roller rack and the frame seat of the present invention; Figure 3 is a schematic diagram of the clamping mechanism of the present invention; Figure 4 is a schematic diagram of the structure of the fixture head and the connection plate of the present invention; Figure 5 is a schematic diagram of the disassembled structure of the docking component of the present invention; Figure 6 is a schematic diagram of the transmission structure of the present invention; Figure 7 is a schematic diagram of the positional structure of the plug column and the flange plate of the present invention.

[0018] In the figure: 1. Frame seat; 101. Second hydraulic cylinder; 102. Support plate; 103. Electric push structure; 2. Welding mechanism; 3. Electric roller rack; 301. Shaft rod; 3011. Support wheel disc; 302. Driving motor; 303. First belt drive; 4. Clamping mechanism; 401. Round rod; 402. Cylinder clamp; 4021. Clamp body; 4022. Fixture head; 403. Lifting bearing frame; 4031. Double bearing kit; 4032. First hydraulic cylinder; 5. Transmission structure; 501. Positioning frame; 502. Rotating shaft; 503. Straight gear; 504. Second belt drive; 6. Docking component; 601. Telescopic structure; 6011. U-shaped plate; 6012. Extension plate; 6013. Notch; 6014. Limit vertical plate; 6015. Threaded lead screw; 602. Connection plate; 603. Plug column. Detailed implementation manners

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0020] Embodiment 1 Please refer to Figures 1 - 7 , this embodiment proposes an automatic welding device for large-diameter steel pipe flanges, which can realize the welding operation by driving the steel pipe and the flange to rotate circumferentially for one circle. The basic structure of the steel pipe flange automatic welding device consists of a frame seat 1 and a welding mechanism 2. Among them, the welding mechanism 2 has functions such as welding, angle and height adjustment, and image detection that are consistent with the prior art, so it will not be described in detail here. An electric roller rack 3 is installed on the frame seat 1, and a clamping mechanism 4 for passing through the steel pipe is provided on the frame seat 1. The clamping mechanism 4 includes a round rod 401 that coincides with the axis of the steel pipe. A cylinder clamp 402 is installed on the rear end face of the round rod 401. The cylinder clamp 402 is composed of a clamp body 4021 and two clamp heads 4022. A transmission structure 5 is provided between the electric roller rack 3 and the clamping mechanism 4. The electric roller rack 3, the clamping mechanism 4, and the transmission structure 5 are applied in cooperation. Specifically, when the electric roller rack 3 is running, firstly, a rotational torque can be generated on the outer wall of the steel pipe placed on the electric roller rack 3; secondly, after the cylinder clamp 402 in the clamping mechanism 4 runs, it can control the two clamp heads 4022 to move in opposite directions until the opposite sides of the two clamp heads 4022 are closely attached to the inner wall of the steel pipe, so that an outward extrusion force will be generated on the inner side of the steel pipe to achieve the fixing effect of the steel pipe. When cooperating with the operation of the electric roller rack 3, the clamping mechanism 4 is controlled to rotate through the transmission structure 5, and a rotational torque is also generated on the inner side of the steel pipe, thereby improving the rotation efficiency and stability of the steel pipe. At the same time, in cooperation with the welding mechanism 2, it can help to achieve a more uniform and uninterrupted welding effect between the steel pipe and the flange, and improve the quality of the final welding.

[0021] Specifically, the electric roller rack 3 includes two shaft rods 301 mounted on the top of the frame base 1 through bearing seats. A support wheel disc 3011 is fixedly sleeved on the outer surface of the shaft rod 301. A driving motor 302 is installed on the frame base 1. A first belt drive 303 is installed between the output end of the driving motor 302 and the two shaft rods 301. During actual application, by operating the driving motor 302, its output shaft rotates in a set direction. Cooperating with the first belt drive 303, the rotational force can be transmitted to the two shaft rods 301, prompting the two shaft rods 301 and the support wheel disc 3011 to rotate in the same direction. The static friction force between the surface of the support wheel disc 3011 and the round tube acts on the round tube, generating a tangential force on its surface, forming a torque that causes the round tube to rotate, and ultimately prompting the round tube to rotate in the direction opposite to that of the shaft rod 301.

[0022] Continuing from the above, under normal circumstances, when welding after aligning the flange and the steel pipe, it is necessary to maintain rotation in the same direction and at the same speed as the steel pipe. To effectively achieve this effect, as Figure 1 、 Figures 3 - 7 shown, docking components 6 are installed on the rear sides of both fixture heads 4022. The docking component 6 includes a telescopic structure 601. A connecting plate 602 is installed between the front side of the telescopic structure 601 and the rear side of the fixture head 4022. A plug post 603 with a length consistent with the thickness of the steel pipe is installed on the front side of the telescopic structure 601. It is known that the flange is provided with an even number of holes and grooves. Therefore, for two opposite holes and grooves, the connecting line thereof will intersect the axis of the flange. Under normal circumstances, it is necessary to adjust the telescopic structure 601 according to the difference between the holes and grooves in the steel pipe and the flange, so that when the cylinder fixture 402 operates and controls the two fixture heads 4022 to closely adhere to the inner wall of the steel pipe, the plug posts 603 on the telescopic structures 601 in the two docking components 6 can exactly be on the same front-back axis as the two relatively central holes and grooves on the flange. Additionally, it is set that when the fixture head 4022 of the cylinder fixture 402 fits against the inner wall of the steel pipe, only the circumferential rotation of the steel pipe is restricted, while when applying a pushing force from front to back to the steel pipe, the restriction is not significant.

[0023] And it is set that when the telescopic structure 601 is adjusted according to the difference between the holes and grooves in the steel pipe and the flange, when the cylinder fixture 402 is in the original state, the distance between the opposite sides of the two adjusted telescopic structures 601 is smaller than the inner diameters of the steel pipe and the flange. Therefore, it does not affect the subsequent docking of the flange to the right rear of the steel pipe.

[0024] The application steps of the clamping mechanism 4 and the docking component 6 are as follows: First, place the steel pipe on the electric roller rack 3, and adjust the round rod 401 to be coaxial with the center of the steel pipe. Then dock the flange to the rear side of the steel pipe. At this time, the docking component 6 is located behind the flange; Then operate the cylinder fixture 402, control two fixture heads 4022 therein to move in opposite directions, and finally the opposite sides of the two fixture heads 4022 are closely attached to the inner wall of the steel pipe, so that the centers of the two insertion columns 603, whose spacing has been adjusted by the telescopic structure 601 according to the difference between the inner wall of the steel pipe and the holes and grooves on the flange, are respectively coaxial with the two relatively arranged holes and grooves in the middle of the flange. After that, hang the flange on the two insertion columns 603 along two opposite holes and grooves, and push the steel pipe from front to back to make its rear side fit with the flange. Then operate the driving motor 302. Through the combined application of multiple structures, when both the inner and outer sides of the steel pipe are subjected to the rotational torque, the flange can be driven by the two insertion columns 603 to rotate synchronously and in the same direction as the steel pipe, effectively eliminating relative movement, making the welding point relatively stationary, the molten pool stable, ensuring more uniform subsequent weld formation, and in addition, continuous welding can be achieved to improve efficiency.

[0025] Embodiment 2 As Figure 4 、 Figure 5 and Figure 7 As shown in

[0026] When the above structures cooperate, by rotating the threaded screw rod 6015, the extension plate 6012 can be made to move along the inner wall of the U-shaped plate 6011 towards one side, thereby adjusting the overall length between the two, and finally achieving the purpose of correspondingly adjusting the position of the insertion column 603 according to the different distances between the inner wall of each group of steel pipes and the holes and grooves on the flange, improving the adaptability of the entire docking assembly 6.

[0027] Embodiment 3 As Figure 1 and Figure 6As shown in the figure, the transmission structure 5 includes a positioning frame 501 installed on the top edge of the frame base 1. A rotating shaft 502 is rotatably installed on the positioning frame 501. Straight gears 503 are installed on the outer surfaces of the rotating shaft 502 and one of the shaft rods 301, and the two straight gears 503 mesh with each other. A belt drive II 504 is detachably installed between the rotating shaft 502 and the round rod 401. As can be seen from the above-mentioned Embodiment 1, after the drive motor 302 operates, the two shaft rods 301 can be controlled to rotate through the belt drive I 303. Combining with this transmission structure 5, through the meshing rotation of the two straight gears 503, the rotating shaft 502 can be controlled to rotate in the direction opposite to that of the shaft rod 301. Subsequently, cooperating with the belt drive I 303, the round rod 401 is driven to rotate in the same direction as the rotating shaft 502, which is also the same as the direction in which the steel pipe rotates under the action of the electric roller rack 3, so as to ensure that the torsional moments received on both the inner and outer sides of the steel pipe are in the same direction.

[0028] Embodiment 4 Under normal circumstances, the steel pipes and flanges to be welded have various sizes. Therefore, after steel pipes of different sizes are placed on the electric roller rack 3, the heights of their central axes are all different. Therefore, the round rod 401 with a fixed height cannot adapt to it. To effectively solve this problem, as Figure 1 and Figure 6 shown, a lifting bearing frame 403 is sleeved on the surface of the round rod 401. The lifting bearing frame 403 includes a double-bearing kit 4031 sleeved on the surface of the round rod 401, and a hydraulic cylinder I 4032 is installed between the double-bearing kit 4031 and the frame base 1. The entire lifting bearing frame 403 can support the round rod 401 and maintain its balance without affecting the rotation of the round rod 401. In addition, cooperating with the telescopic operation of the hydraulic cylinder I 4032, the height position of the round rod 401 can be adjusted accordingly through the double-bearing kit 4031, so as to facilitate following the adjustment according to the different sizes of the steel pipes and flanges to be welded, and ensure that the round rod 401 always coincides with the central axes of the steel pipe and the flange.

[0029] Continuing from the above-mentioned Embodiment 3, it is set that the belt drive II 504 is detachably installed between the rotating shaft 502 and the round rod 401. Therefore, when welding steel pipes and flanges of different sizes before and after, it is necessary to replace the matching belt drive II 504 between the rotating shaft 502 and the round rod 401 with the height adjusted, so that after the drive motor 302 operates, the transmission function of the round rod 401 can be maintained.

[0030] In addition, a hydraulic cylinder II 101 is installed on the frame base 1, and a support plate 102 for supporting the flange is installed at the top end of the hydraulic cylinder II 101. When the hydraulic cylinder II 101 operates, according to its operating principle and function, the height position of the support plate 102 can be conveniently adjusted when the size of the flange changes, so that the adjusted flange, steel pipe and round rod 401 are coaxial.

[0031] Embodiment Five As Figure 1 shown, an electric pushing structure 103 is further installed on the frame base 1. After the insertion post 603 is inserted into two slots on the flange, the electric pushing structure 103 is operated to generate a forward driving force on the steel pipe, so that the steel pipe is docked with the flange at a set position, facilitating the alignment of the connection between the steel pipe and the flange with the welding station of the welding mechanism 2.

[0032] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. An automatic welding device for large-diameter steel pipe flanges, comprising a frame base (1) and a welding mechanism (2), characterized in that: An electric roller rack (3) for driving the circumferential rotation of a steel pipe is installed on the frame seat (1). A clamping mechanism (4) passing through the steel pipe is provided on the frame seat (1). A transmission structure (5) is provided between the electric roller rack (3) and the clamping mechanism (4). When the electric roller rack (3) is running, the transmission structure (5) drives the clamping mechanism (4) pressing against the inner wall of the steel pipe to rotate synchronously, so that both the inner wall and the outer wall of the steel pipe are subjected to torques in the same direction; The clamping mechanism (4) includes a round rod (401) coinciding with the axis of the steel pipe. A cylinder clamp (402) is installed on the rear end face of the round rod (401). The cylinder clamp (402) is composed of a clamp body (4021) and two clamp heads (4022). A lifting bearing frame (403) is sleeved on the surface of the round rod (401). Docking components (6) are installed on the rear sides of both clamp heads (4022); The docking component (6) includes a telescopic structure (601). A connecting plate (602) is installed between the front side of the telescopic structure (601) and the rear side of the clamp head (4022). A plug-in column (603) with a length consistent with the thickness of the steel pipe is installed on the front side of the telescopic structure (601).

2. The automatic welding device for large-diameter steel pipe flanges according to claim 1, characterized in that: The telescopic structure (601) includes a U-shaped plate (6011). The U-shaped plate (6011) is installed on the rear side of the connecting plate (602). An extension plate (6012) is slidably installed inside the U-shaped plate (6011). The plug-in column (603) is installed on the front side of the extension plate (6012). A notch (6013) is opened at the top of the extension plate (6012). A limiting vertical plate (6014) is installed between the top wall and the bottom wall of the U-shaped plate (6011). The limiting vertical plate (6014) is arranged through the notch (6013).

3. The automatic welding device for large-diameter steel pipe flanges according to claim 1, characterized in that: A threaded lead screw (6015) is rotatably installed between the U-shaped plate (6011) and the limiting vertical plate (6014), and the threaded lead screw (6015) is rotatably connected to the extension plate (6012).

4. The automatic welding device for large-diameter steel pipe flanges according to claim 1, wherein: The electric roller rack (3) includes two shaft body rods (301) installed on the top of the frame seat (1) through bearing seats. A support wheel disc (3011) is fixedly sleeved on the outer surface of the shaft body rod (301). A driving motor (302) is installed on the frame seat (1). A first belt drive (303) is installed between the output end of the driving motor (302) and the two shaft body rods (301).

5. The automatic welding device for large-diameter steel pipe flanges according to claim 1, wherein: The transmission structure (5) includes a positioning frame (501). The positioning frame (501) is installed on the top edge of the frame seat (1). A rotating shaft (502) is rotatably installed on the positioning frame (501). Straight gears (503) are installed on the outer surfaces of the rotating shaft (502) and one of the shaft body rods (301), and the two straight gears (503) mesh with each other. A second belt drive (504) is detachably installed between the rotating shaft (502) and the round rod (401).

6. The automatic welding device for large-diameter steel pipe flanges according to claim 1, characterized in that: The lifting bearing frame (403) includes a double bearing kit (4031). The double bearing kit (4031) is sleeved on the surface of the round rod (401). A first hydraulic cylinder (4032) is installed between the double bearing kit (4031) and the frame seat (1).

7. The automatic welding device for large-diameter steel pipe flanges according to claim 1, characterized in that: A second hydraulic cylinder (101) is installed on the frame base (1), and a support plate (102) for supporting the flange is installed at the top of the second hydraulic cylinder (101).

8. The automatic welding device for large-diameter steel pipe flanges according to claim 1, wherein: An electric pushing structure (103) is also installed on the frame base (1) for pushing the steel pipe and the flange from front to back so that the connection between the two corresponds to the welding station of the welding mechanism (2).

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