A small-diameter tubular structure inner wall circular seam welding mechanism

Abstract

The present invention provides a small-aperture tubular structure inner wall girth seam welding mechanism, relating to the field of welding technology. The small-aperture tubular structure inner wall girth seam welding mechanism comprises an inner furnace body and a frame, and is characterized in that a movable platform is slidably connected in the frame, a driving device is provided on the movable platform, a welding arm for extending into the pipe fitting is provided on the driving device, a welding arm is provided with a welding gun located on the outer side thereof, and the driving device is used to drive the welding arm to rotate; the beneficial effects of the present invention are as follows: when performing girth seam welding on the inner wall of a small-aperture pipe fitting, the welding arm can carry the welding gun and extend into the pipe fitting, and with the scale on the welding arm, the position of the gun head of the welding gun can be accurately grasped, which effectively solves the problems of being difficult to clearly observe the welding position and being difficult to operate the welding gun for swing welding when welding small-aperture pipe fittings, making the welding operation of small-aperture pipe fittings simpler, more convenient and more efficient.

Description

Technical Field

[0001] The invention relates to the technical field of welding, in particular to a small-aperture tubular structure inner wall annular seam welding mechanism. Background Art

[0002] Currently, the industry has great difficulty in welding the internal circumferential seams of cylindrical and tubular workpieces with small diameters and large depths. In order to ensure work efficiency and work costs, such welding operations are generally completed by welding machines. Existing pipe inner wall circumferential seam welding machines usually include a vertical column with a workbench slidably connected to the vertical column, a horizontal welding arm is provided on the workbench, and a welding gun is provided at one end of the welding arm. When in use, the welding gun is extended into the specified welding position in the tubular workpiece, and the welding gun position is kept unchanged. During the welding process, the workpiece rotates slowly to realize the feeding of the welding gun, and finally the circumferential seam welding work is completed in the tubular workpiece.

[0003] The above-mentioned welding machine has certain defects in the working environment. It can only complete the circumferential seam welding of the inner wall of the pipe fitting in a free state. It is not suitable for welding work of pipe fittings that have been fixed at the installation site, such as the extension welding work of pipe fittings at the metal pipe arrangement site. Since the pipe fittings are fixed and cannot rotate, the above-mentioned welding machine lacks the freedom to drive the welding gun to move in a circular motion, resulting in the inability to complete the welding work, resulting in the difficulty of on-site construction still being very great. For this reason, the present invention provides a tubular structure inner wall circumferential seam welding mechanism that can be used for on-site construction. Summary of the Invention

[0004] The purpose of the present invention is to provide a small-aperture tubular structure inner wall annular seam welding mechanism, aiming to solve the problem of ***.

[0005] To achieve the above-mentioned purpose, the present invention adopts the following technical solution: it includes a frame, a movable platform is slidably connected to the frame, a driving device is provided on the movable platform, a welding arm for extending into the pipe is provided on the driving device, a welding arm is provided with a welding gun located on its outside, and the driving device is used to drive the welding arm to rotate.

[0006] In order to facilitate driving the movable platform to move relative to the frame, a sliding drive member arranged along the direction of the welding arm is provided between the movable platform and the frame.

[0007] In order to enable the welding gun to swing and achieve better welding effect, a slide is provided on the welding arm, and the slide is slidably connected to the base. The welding gun is installed on the base via a first telescopic component. The welding arm is provided with a gun swinging mechanism for driving the welding gun to swing, and an elastic member for resetting the welding gun is also provided between the base and the bottom of the slide.

[0008] Specifically, the gun swinging mechanism includes a motor arranged in the welding arm, and a power transmission structure is provided on the output shaft of the motor. The output shaft of the power transmission structure extends out of the welding arm and is provided with an eccentric wheel. The eccentric wheel can push the welding gun to make the welding gun move back and forth along the sliding path. The eccentric distance of the connection between the eccentric wheel and the output shaft of the power transmission structure is adjustable.

[0009] In order to drive the welding arm to rotate and reduce the rotation speed of the welding arm at the same time, the driving device includes a motor mounted on a movable platform, a speed regulator is provided on the output shaft of the motor, and the welding gun is connected to the output shaft of the speed regulator.

[0010] In order to increase the stability of the welding arm, the outer end of the welding arm is movably connected to a support component, and a plurality of second telescopic components are provided on the support component. Each of the second telescopic components is provided with a wear-reducing component that contacts the inner wall of the pipe.

[0011] In order to fix the pipe to be welded, the frame is provided with a clamping component for fixing the pipe to be welded, and the clamping center of the clamping component coincides with the axis of the welding arm.

[0012] Specifically, the clamping component includes two relatively movable clamping plates, and the frame is provided with a hydraulic cylinder for driving the clamping plates to move relative to each other.

[0013] Preferably, the two opposite ends of the two splints are provided with protective pads

[0014] In order to clearly grasp the position of the welding gun tip, a scale is provided on the welding arm, and the scale indicates the depth of the welding gun tip in the pipe.

[0015] The beneficial effects of the present invention are:

[0016] 1. When performing girth welding on the inner wall of a small-diameter pipe fitting, the welding arm can carry the welding gun and extend it into the pipe fitting. With the help of the scale on the welding arm, the position of the welding gun tip can be accurately controlled. This effectively solves the problems of difficulty in clearly observing the welding position and operating the welding gun for swing welding when welding small-diameter pipe fittings, making the welding operation of small-diameter pipe fittings simpler, more convenient and more efficient.

[0017] 2. The driving device is installed on the mobile platform and matched with the sliding driving part. When the mobile platform moves outward, the driving device controls the welding arm to alternately rotate forward and reverse to realize the swing of the welding gun, thereby realizing the function of linear welding on the inner wall of small-diameter pipe fittings, increasing the welding function of the welding mechanism, so that it can cope with more complex working environments. Even if one end of the pipe fitting is fixed, the welding operation can be completed, and it can be applied to the welding extension work of pipe fittings in on-site construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a main axonometric diagram of the present invention;

[0019] Figure 2 This is a schematic diagram of the main axonometric view of the movable platform in the present invention when it is in the extended state;

[0020] Figure 3 This is a schematic diagram of the main axonometric view after removing the clamping components in the present invention;

[0021] Figure 4 This is a rear axonometric view of the present invention after removing the clamping components;

[0022] Figure 5 This is a schematic diagram of the installation state of the welding gun in the present invention;

[0023] Figure 6 It is a schematic front view of the supporting component in the present invention;

[0024] Figure 7 This is a schematic diagram of the installation of the eccentric wheel and the supporting component in the present invention;

[0025] Figure 8 This is a schematic diagram of the installation of the elastic member in the present invention;

[0026] Figure 9 It is a structural diagram of the gun swinging mechanism in the present invention;

[0027] Figure 10 is a schematic diagram of the welding arm and scale in the present invention;

[0028] Figure 11 It is a schematic diagram of the welding gun swing trajectory in the present invention.

[0029] In the figure: 1. Frame; 2. Moving table; 3. Driving device; 4. Welding arm; 5. Welding gun; 6. Sliding drive member; 71. Slide; 72. Base; 73. First telescopic member; 74. Gun swing mechanism; 75. Elastic member; 741. Motor; 742. Power transmission structure; 743. Eccentric wheel; 301. Motor; 302. Speed ​​regulator; 81. Support member; 82. Second telescopic member; 83. Friction reducing member; 9. Clamping member; 91. Clamping plate; 92. Hydraulic cylinder; 93. Protective pad; 10. Scale. DETAILED DESCRIPTION

[0030] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0031] See also Figure 1-6: A small-aperture tubular structure inner wall circumferential seam welding mechanism, comprising a frame 1, a movable platform 2 being slidably connected to the frame 1, a driving device 3 being provided on the movable platform 2, a welding arm 4 for extending into the pipe being provided on the driving device 3, a welding arm 4 being provided with a welding gun 5 located on its outside, and the driving device 3 being used to drive the welding arm 4 to rotate.

[0032] Example 1: When performing girth welding on a small-diameter pipe fitting that is not convenient for manual welding, the welding arm 4 is inserted into the pipe fitting to be welded, and the welding gun 5 on the welding arm 4 is moved to the designated welding position to start welding. During the welding process, the driving device 3 rotates the welding arm 4 to achieve the function of welding while rotating. When the welding arm 4 rotates one circle, the girth welding work on the inner wall of the small-diameter pipe fitting is completed;

[0033] Embodiment 2: The present invention can also be used for linear welding of the inner wall of a small-diameter pipe. During linear welding, the welding arm 4 is first inserted into a designated position in the pipe, and then welding is started. During the welding process, the movable platform 2 moves along the welding direction, thereby driving the welding gun 5 to move along the welding direction, thereby achieving linear welding.

[0034] Since the driving device 3 drives the welding gun 5 to rotate via the welding arm 4 during the welding process, the pipe to be welded does not need to be moved or rotated to achieve the circumferential seam welding work. In this way, the welding work is not restricted by whether the pipe to be welded is fixed. Not only can the inner wall circumferential seam welding work be performed on the pipe in a free state, but also the extension welding work can be performed on the pipe with one end fixed and in operation. The scope of use is wider than that of the welding mechanism in which the pipe moves or rotates.

[0035] In addition, the welding mechanism of the present invention can also perform linear welding on the inner wall of a small-diameter pipe, further increasing the welding working capacity, being applicable to more welding environments and welding tasks, and having better working performance.

[0036] See also Figure 1 and Figure 2 : A sliding drive member 6 is provided between the movable platform 2 and the frame 1 along the direction of the welding arm 4; the sliding drive member 6 includes but is not limited to an electric slide rail, various telescopic rods, a threaded screw structure, a gear rack structure and a belt structure.

[0037] See also Figure 7 and Figure 8 : The welding arm 4 is provided with a slideway 71, and the slide is slidably connected to a base 72. The welding gun 5 is mounted on the base 72 via a first telescopic component 73. The welding arm 4 is provided with a gun swinging mechanism 74 for driving the welding gun 5 to swing. An elastic member 75 for resetting the welding gun 5 is also provided between the base 72 and the bottom of the slideway 71;

[0038] In specific work, due to the different pore diameters of the pipes to be welded, the first telescopic component 73 can adjust the distance between the gun head of the welding gun 5 and the inner wall of the pipe to be welded, so that the gun head of the welding gun 5 and the part to be welded maintain a suitable distance, thereby ensuring the quality of welding;

[0039] During welding, the welding gun 5 has two swing modes:

[0040] Example 1: During the circumferential seam welding operation, the gun swinging operation is achieved by the gun swinging mechanism 74 pushing the welding gun 5 to move back and forth along the slide 71, combined with the rotation of the welding arm 4;

[0041] Example 2: During the linear welding of the inner wall of the pipe, the gun swing operation is achieved by the driving device 3 driving the welding arm 4 through the speed regulator 302 to alternately rotate forward and reverse, while combining the movement of the moving platform 2; the trajectory of the gun swing is as follows Figure 11 shown.

[0042] See also Figure 7 and Figure 9 The gun swing mechanism 74 includes a motor 741 disposed in the welding arm 4. A power transmission structure 742 is provided on the output shaft of the motor 741. The output shaft of the power transmission structure 742 extends out of the welding arm 4 and is provided with an eccentric wheel 743. The eccentric wheel 743 can push the welding gun 5 to make the welding gun 5 move back and forth along the sliding path. The eccentric distance between the eccentric wheel 743 and the output shaft of the power transmission structure 742 is adjustable.

[0043] When the gun swinging mechanism 74 drives the welding gun 5 to swing, the motor 741 in the welding arm 4 serves as a power source, outputting power to the eccentric wheel 743 through the power transmission structure 742, so as to drive the eccentric wheel 743 to rotate. During the eccentric rotation of the eccentric wheel 743, the welding gun 5 is pushed to move along the slide 71, and the elastic member 75 is squeezed at the same time. Under the action of the elastic member 75 pushing the base 72, the welding gun 5 is always in contact with the eccentric wheel 743, so that the eccentric wheel 743 can achieve periodic reciprocating movement of the welding gun 5 along the slide 71 during the eccentric rotation, and then combined with the rotation of the welding arm 4 to complete the gun swinging movement of the welding gun 5.

[0044] Since the eccentric wheel 743 is provided with an adjustment slot, the output shaft of the power transmission structure 742 is mounted in the adjustment slot by means of a bolt and a nut. The distance between the output shaft of the power transmission structure 742 and the center of the eccentric wheel 743 can be adjusted by the nut, thereby adjusting the swinging force of the welding gun 5 driven by the eccentric wheel 743, so as to achieve a better welding effect according to the specific environment.

[0045] Preferably, the power transmission structure 742 includes but is not limited to a bevel gear transmission set, a worm gear transmission mechanism, etc.

[0046] Preferably, the elastic member 75 is a spring.

[0047] See also Figure 1-4 The driving device 3 includes a motor 301 mounted on the movable platform 2, a speed regulator 302 is provided on the output shaft of the motor 301, and the welding gun 5 is connected to the output shaft of the speed regulator 302;

[0048] The motor 301 is installed on the movable platform 2, and can be used not only for circumferential seam welding, but also for linear welding of the inner wall of small-diameter pipe fittings. The rotation speed of the motor 301 is output to the welding arm 4 after being adjusted by the speed regulator 302, and is used to drive the welding arm 4 to rotate. In this way, when performing seam welding, the moving speed of the welding gun 5 can be effectively controlled to prevent the welding gun 5 from moving too fast. At the same time, when performing linear welding, the forward and reverse rotation speed of the welding arm 4 can be increased to realize the swinging operation of the welding gun 5, so as to facilitate the adjustment of the rotation speed of the welding arm 4, so that it can play different roles in different welding operations.

[0049] See also Figure 4-7 The outer end of the welding arm 4 is movably connected to a support component 81, and a plurality of second telescopic components 82 are provided on the support component 81. Each of the second telescopic components 82 is provided with a wear-reducing component 83 in contact with the inner wall of the pipe;

[0050] The support portion is mounted on one end of the welding arm 4 using a fastening nut. When welding pipes with different inner diameters, the wear-reducing component 83 is adjusted by the second telescopic component 82 so that the wear-reducing component 83 contacts the inner wall of the pipe to be welded, thereby supporting the welding arm 4 and preventing the welding arm 4 from extending too far into the pipe and causing the welding arm 4 to shake during rotation. This increases the stability of the welding gun 5 during welding, thereby improving the welding quality.

[0051] The second telescopic component 82 includes but is not limited to an electric telescopic rod, a hydraulic telescopic rod, a threaded screw structure, an airbag and other structures;

[0052] The wear-reducing components 83 include but are not limited to balls, rollers, universal wheels, circumferential sliding seats, etc.

[0053] See also Figure 1 and Figure 2 The frame 1 is provided with a clamping component 9 for fixing the pipe to be welded, and the clamping center of the clamping component 9 coincides with the axis of the welding arm 4;

[0054] The bottom of the clamping component 9 is in sliding contact with the upper end surface of the frame 1, and the workpiece to be welded is placed on the upper end surface of the frame 1, which supports the workpiece to be welded and ensures that the two ends of the workpiece to be welded are on the same horizontal plane. Then, under the clamping of the clamping component 9, the axis of the workpiece to be welded coincides with the axis of the welding arm 4, realizing the function and effect of automatic alignment, and providing convenience for the alignment operation of the welding work.

[0055] Furthermore, the clamping component 9 includes two relatively movable clamps 91, and the frame 1 is provided with a hydraulic cylinder 92 for driving the clamps 91 to move relative to each other; wherein the hydraulic cylinder 92 simultaneously drives the clamps 91 on both sides to move synchronously, and always keeps the clamps 91 on both sides symmetrical about the axis of the welding arm 4, so that automatic alignment can be achieved while clamping the workpiece.

[0056] Preferably, protective pads 93 are respectively provided at the opposite ends of the two clamps 91, one of which is to protect the workpiece to prevent the clamps 91 from clamping the workpiece, and the other is to increase the friction between the clamps 91 and the workpiece to increase the clamping stability.

[0057] See also Figure 10 The welding arm 4 is provided with a scale 10, which indicates the depth of the gun head of the welding gun 5 in the pipe fitting. It is used to accurately grasp the position of the welding gun 5 in the pipe fitting during welding, avoid misalignment of the welding position and the weld, and cause welding deviation, thereby increasing the accuracy of welding.

[0058] In the description of the present invention, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

Claims

1. A small-aperture tubular structure inner wall annular seam welding mechanism, comprising a frame (1), characterized in that: A movable platform (2) is slidably connected to the frame (1), a driving device (3) is provided on the movable platform (2), a welding arm (4) for extending into the pipe is provided on the driving device (3), a welding gun (5) is provided on the outer side of the welding arm (4), and the driving device (3) is used to drive the welding arm (4) to rotate; A sliding drive member (6) arranged along the direction of the welding arm (4) is provided between the movable platform (2) and the frame (1); The welding arm (4) is provided with a slideway (71), a base (72) is slidably connected in the slideway (71), the welding gun (5) is mounted on the base (72) via a first telescopic component (73), the welding arm (4) is provided with a gun swinging mechanism (74) for driving the welding gun (5) to swing, and an elastic member (75) for resetting the welding gun (5) is further provided between the base (72) and the bottom of the slideway (71); The gun swing mechanism (74) includes a motor (741) arranged in the welding arm (4), a power transmission structure (742) is provided on the output shaft of the motor (741), the output shaft of the power transmission structure (742) extends out of the welding arm (4) and is provided with an eccentric wheel (743), the eccentric wheel (743) can push the welding gun (5) so that the welding gun (5) moves back and forth along the sliding direction, and the eccentric distance between the eccentric wheel (743) and the output shaft of the power transmission structure (742) is adjustable; The outer end of the welding arm (4) is movably connected to a support component (81), and a plurality of second telescopic components (82) are provided on the support component (81), and each second telescopic component (82) is provided with a wear-reducing component (83) that contacts the inner wall of the pipe.

2. The small-aperture tubular structure inner wall circumferential seam welding mechanism according to claim 1, characterized in that: The driving device (3) comprises a motor (301) mounted on a movable platform (2), a speed regulator (302) is provided on an output shaft of the motor (301), and the welding gun (5) is connected to the output shaft of the speed regulator (302).

3. The small-aperture tubular structure inner wall annular seam welding mechanism according to claim 1, characterized in that: The frame (1) is provided with a clamping component (9) for fixing the pipe to be welded, and the clamping center of the clamping component (9) coincides with the axis of the welding arm (4).

4. The small-aperture tubular structure inner wall annular seam welding mechanism according to claim 3, characterized in that: The clamping component (9) comprises two relatively movable clamping plates (91), and the frame (1) is provided with a hydraulic cylinder (92) for driving the clamping plates (91) to move relative to each other.

5. The small-aperture tubular structure inner wall circumferential seam welding mechanism according to claim 1, characterized in that: The welding arm (4) is provided with a scale (10), and the scale (10) indicates the depth at which the tip of the welding gun (5) is located in the pipe.

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