A pipe girth welding device

Abstract

The utility model discloses a pipeline ring slit welding device, including base, welding torch, sliding support, pipeline bracket and support drive mechanism, the top of sliding support is equipped with the support sleeve, is equipped with a plurality of roller shafts in the support sleeve, and a plurality of roller shafts are used for clamping the outer periphery of pipeline, is installed on sliding support and drives the motor, and drives the motor and at least one roller shaft transmission connection, when the drive motor is in the working condition, and the roller shaft transmission connection of drive motor is in the rotating state, and can drive the pipeline between a plurality of roller shafts clamped and rotate. The pipeline ring slit welding device can support the welding end of two pipelines, can also drive two pipelines to rotate actively, realizes integrated rotation, maintains the stability of the welding end of the pipeline, facilitates the quick butt joint of the welding end of two pipelines, avoids the relative sliding phenomenon between the welding end surfaces of two pipelines in the early stage of welding, and improves the welding quality and welding efficiency.

Description

Technical Field

[0001] This utility model relates to the field of pipeline welding technology, and in particular to a pipeline circumferential weld device. Background Technology

[0002] Pipe circumferential welding is used to weld two pipes of the same diameter together. The ends of the two pipes are first butted together, and then welded by a welding torch. The pipes are rotated while welding, and finally the pipe circumferential welding is completed.

[0003] In existing technologies, pipe circumferential welding machines are generally used to weld the circumferential seams of two pipes. These machines typically employ two clamping structures to hold the ends of the two pipes together, aligning the weld ends. Rotating one pipe causes the other pipe to rotate, and then welding is performed using a welding torch. The drawback of this technique is that it relies entirely on the pressure at both ends to hold the pipes in place, leaving the weld ends unsupported. If the pipes are long, the weld ends may shift downwards due to gravity. This necessitates extremely precise alignment of the two pipes and requires significant pressure to hold them in place, making the operation difficult.

[0004] For example, Chinese utility model patent CN220427227U discloses a steel structure pipe circumferential welder. Its welding worktable has two fixed bases, a first fixed base and a second fixed base, at its two ends. An adjustable welding torch is mounted above the welding worktable. Both fixed bases have through holes for the steel pipes to pass through. A circumferential welder rotation mechanism is located inside fixed base one. A first steel pipe can pass through this mechanism and be clamped by the grippers, causing it to rotate. A workpiece clamping mechanism and a hydraulic push rod are located inside fixed base two. The hydraulic push rod is used to push the workpiece clamping mechanism to move linearly. A second steel pipe can pass through the workpiece clamping mechanism and be moved towards one side of fixed base one, aligning and clamping the ends of the two steel pipes. Then, the circumferential welder rotation mechanism rotates the first steel pipe, which in turn rotates the second steel pipe, and welding is then performed using the welding torch.

[0005] The drawbacks of the above technology are as follows: the circumferential seam rotation mechanism is located next to the fixed base one and cannot move towards the center, thus failing to support the welding end of the first steel pipe; the welding clamping mechanism is located inside the fixed base two, and its movement towards the center is limited by the hydraulic push rod, so it also fails to support the welding end of the second steel pipe. This results in the welding ends of the two steel pipes being far from the support position, and under the influence of gravity, the welding ends tend to sink, requiring manual alignment before applying greater pressure to hold the two steel pipes in place, making the operation cumbersome. Rotating only one steel pipe to drive the rotation of the other creates a certain torque between the welding end faces of the two steel pipes. In the initial stage of welding, if the first steel pipe rotates too quickly, or the rotation of the second steel pipe is obstructed, the welding end faces will experience relative slippage. Direct welding under these conditions will affect the welding quality, and re-tightening will reduce efficiency.

[0006] Therefore, it is necessary to provide a new type of pipe circumferential welding device. Utility Model Content

[0007] The purpose of this invention is to overcome the shortcomings of the prior art and provide a pipe circumferential weld device that can support the welding ends of two pipes and actively drive the two pipes to rotate, achieving integrated rotation, maintaining the stability of the welding ends of the pipes, facilitating rapid docking of the welding ends of the two pipes, and avoiding relative sliding between the welding end faces of the two pipes in the early stage of welding, thereby improving welding quality and welding efficiency.

[0008] This utility model provides a pipe circumferential weld device, including a base and a welding torch disposed above the base and adjustable up and down;

[0009] The base is provided with a sliding bracket and a pipe bracket on opposite sides of the welding torch, respectively.

[0010] The base is also provided with a bracket drive mechanism for driving the pair of sliding brackets to move towards each other.

[0011] The top of the sliding bracket is fitted with a support sleeve for the welded end of the pipe to pass through and for supporting the welded end.

[0012] The support sleeve has multiple rollers spaced circumferentially inside, and the multiple rollers are used to clamp the outer periphery of the pipe.

[0013] A drive motor is mounted on the sliding bracket, and the drive motor is connected to at least one of the rollers.

[0014] When the drive motor is in operation, the rollers that are connected to the drive motor are in a rotating state and can drive the pipe sandwiched between the multiple rollers to rotate.

[0015] In one of the alternative technical solutions, the support sleeve includes two arc-shaped cylindrical walls that are arranged in half, the two arc-shaped cylindrical walls are assembled on opposite sides of the sliding bracket, and an opening is formed between the bottoms of the two arc-shaped cylindrical walls;

[0016] A cylinder wall drive mechanism is connected between the two arc-shaped cylinder walls and the sliding bracket to drive the two arc-shaped cylinder walls to move towards each other;

[0017] The multiple rollers include multiple driven rollers and at least one driving roller that is connected to the drive motor. Multiple driven rollers are installed on the inner side of each arc-shaped cylinder wall.

[0018] The top of the sliding bracket is provided with a bracket groove communicating with the opening. The active roller is pivotally mounted in the bracket groove, and a part of the active roller extends into the central hole of the support sleeve through the opening.

[0019] In one of the alternative technical solutions, the multiple driven rollers of the two arc-shaped cylinder walls are arranged symmetrically in pairs;

[0020] Each of the arc-shaped cylindrical walls is provided with a driven roller in the upper, middle and lower halves.

[0021] In one of the alternative technical solutions, each of the arcuate cylindrical walls has a connecting lug at the top, and the two connecting lugs are detachably connected by connecting bolts.

[0022] In one of the alternative technical solutions, the inner surface of the arc-shaped cylinder wall is provided with a cylinder wall groove, the driven roller is pivotally mounted in the cylinder wall groove, and a portion of the driven roller extends into the central hole of the support sleeve.

[0023] In one alternative technical solution, a lifting slide plate is installed in the bracket groove, and the active roller is pivotally mounted on the top of the lifting slide plate;

[0024] The bracket groove is equipped with a skateboard drive mechanism for driving the lifting skateboard to move up and down.

[0025] The drive motor is connected to the lifting slide plate and can move as a whole with the lifting slide plate. The drive motor is also connected to the active roller drive.

[0026] In one alternative technical solution, the drive motor is mounted on the lifting slide plate.

[0027] In one of the alternative technical solutions, three active rollers are installed at intervals on the top of the lifting slide plate, and the three active rollers are arranged in an arc with the central axis of the support sleeve as the center.

[0028] The central active roller is located directly below the central axis of the support sleeve.

[0029] In one of the alternative technical solutions, the drive motor is connected to the middle active roller through a first transmission mechanism, and the two active rollers on both sides are respectively connected to the middle active roller through a second transmission mechanism.

[0030] In one of the alternative technical solutions, the first transmission mechanism and the second transmission mechanism are located at opposite ends of the driving roller in the middle.

[0031] The above technical solution has the following beneficial effects:

[0032] The pipe circumferential welder provided by this utility model includes a base, a welding torch, two sets of sliding supports, two sets of pipe brackets, and a support drive mechanism.

[0033] The welding torch is positioned approximately in the center of the base and can be adjusted vertically. A sliding support and a pipe bracket are mounted on either side of the welding torch. The sliding support has a support sleeve and a drive motor. Multiple rollers are housed within the support sleeve, and the drive motor drives at least one roller to rotate.

[0034] The pipe support is located outside the sliding bracket to support the main body of the pipe. The sliding bracket is driven by a bracket drive mechanism to move towards the welding torch position. The welding end of the pipe passes through the support sleeve and is held by multiple rollers against the pipe wall, thus supporting the welding end. The bracket drive mechanism drives two sets of sliding brackets closer together, aligning and pressing the welding ends of the two pipes together. Then, two drive motors respectively drive at least one roller in each of the two support sleeves to rotate, allowing both pipes to rotate within their respective support sleeves. Because the welding ends of the two pipes are pressed together, they naturally rotate as a whole. Finally, the welding torch extends and welds along the joint of the two pipes, completing the circumferential weld.

[0035] Because each pipe is clamped by multiple rollers, there is virtually no rotational jamming. With two sets of drive motors, even if one motor fails, the other can independently drive the pipe rotation. Since the roller radius is much smaller than the pipe radius, the rollers will only drive the pipe to rotate slowly, preventing excessive speed. This ensures that the weld ends do not slip during the initial welding stage and also ensures sufficient welding time at each position, thus improving weld quality.

[0036] In summary, the pipe circumferential welding device provided by this utility model can not only support the welding ends of two pipes, but also actively drive the two pipes to rotate and achieve integrated rotation, maintaining the stability of the welding ends of the pipes, facilitating the rapid connection of the welding ends of the two pipes, and avoiding the phenomenon of relative sliding between the welding end faces of the two pipes in the initial stage of welding, thereby improving welding quality and welding efficiency. Attached Figure Description

[0037] The disclosure of this utility model will become more readily understood by referring to the accompanying drawings. It should be understood that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of this utility model. In the drawings:

[0038] Figure 1 This is a front view of a pipe circumferential welder provided in an embodiment of the present invention;

[0039] Figure 2 This is a schematic diagram illustrating the positioning of two pipes using the pipe circumferential welding device provided in this embodiment of the utility model.

[0040] Figure 3 for Figure 1 A cross-sectional view along direction AA;

[0041] Figure 4 for Figure 1 A cross-sectional view along the BB direction;

[0042] Figure 5 for Figure 1 A sectional view along the CC direction;

[0043] Figure 6 for Figure 4 A magnified view of a portion of the image;

[0044] Figure 7 A cross-sectional view of two curved cylindrical walls assembled on top of a sliding bracket;

[0045] Figure 8 for Figure 6 A cross-sectional view along the axial direction of the support sleeve;

[0046] Figure 9This is a schematic diagram showing the two curved cylindrical walls moving away from each other during pipe installation.

[0047] Figure 10 A schematic diagram showing how the pipe is clamped by rollers to reset the two curved cylindrical walls;

[0048] Figure 11 for Figure 10 A cross-sectional view along the axial direction of the support sleeve;

[0049] Figure 12 A 3D view of three active rollers mounted on a lifting slide plate;

[0050] Figure 13 for Figure 12 A stereoscopic view from another perspective;

[0051] Figure 14 This is a perspective view of the driven roller installed in a groove in the curved cylinder wall. Detailed Implementation

[0052] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings. Identical components are indicated by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to directions in the accompanying drawings, while the terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0053] like Figure 1-5 , Figure 8 and Figure 10-11 As shown, a pipe circumferential welder provided in one embodiment of the present invention includes a base 1 and a welding torch 2 disposed above the base 1 and adjustable up and down.

[0054] On the base 1, a sliding bracket 3 and a pipe bracket 4 are respectively provided on opposite sides of the welding torch 2.

[0055] The base 1 is also provided with a bracket drive mechanism 5 for driving a pair of sliding brackets 3 to move in opposite directions.

[0056] The top of the sliding bracket 3 is fitted with a support sleeve 6 for the welded end 101 of the pipe 100 to pass through and for supporting the welded end 101.

[0057] Multiple rollers 7 are provided circumferentially within the support sleeve 6, and the multiple rollers 7 are used to clamp the outer periphery of the pipe 100.

[0058] A drive motor 8 is mounted on the sliding bracket 3, and the drive motor 8 is connected to at least one roller 7 in a transmission manner.

[0059] When the drive motor 8 is in operation, the rollers 7 that are connected to the drive motor 8 are in a rotating state and can drive the pipe 100 sandwiched between multiple rollers 7 to rotate.

[0060] The pipe circumferential welding device provided by this utility model is used to perform circumferential welding on two pipes 100, such as stainless steel pipes. In this application, the end of the two pipes 100 that needs to be welded is referred to as the welding end 101.

[0061] The pipe circumferential welding device includes a base 1, a welding torch 2, a sliding support 3, a pipe bracket 4, a support drive mechanism 5, a support sleeve 6, a roller 7, and a drive motor 8.

[0062] The base 1 is used to place on the ground or in a designated location, and it may be equipped with wheels or the like for easy movement.

[0063] The base 1 has a rectangular structure, with an upward-extending column 11 on one side approximately at the middle of its length. A hanging plate 111 is located at the upper end of the column 11, positioned above and roughly parallel to the base 1. A welding torch 2 is mounted below the hanging plate 111 and can be adjusted vertically. For example, the torch head 21 is connected to the lower part of a telescopic mechanism 22, which is mounted on the bottom surface of the hanging plate 111. This allows the torch head 21 to move vertically to perform welding operations on the pipe 100 below, after which the torch head 21 is raised away from the pipe 100.

[0064] The bottom of the column 11 can be mounted on one side of the base 1 via a sliding mechanism, allowing the column 11 to be moved and adjusted relative to the base 1 in the length direction. If the welding torch 2 cannot be aligned with the weld seam between the welding ends 101 of the two pipes 100 in the front-back direction along the base 1, the position of the welding torch 2 can be adjusted by moving the column 11.

[0065] The content regarding the position adjustment and vertical adjustment of the welding torch 2 is existing technology and is not the inventive point of this case. Please refer to the description in the existing technology, and it will not be repeated here.

[0066] A baffle 12 extending along its width is provided at approximately the center of the base 1, preferably directly below the gun head 21. Guide rails 13 extending along the length of the base 1 are provided on both sides of the baffle 12.

[0067] Two sets of sliding supports 3 and two sets of pipe brackets 4 are arranged on the base 1. A set of sliding supports 3 and a set of pipe brackets 4 are respectively arranged on both sides of the welding torch 2 or baffle 12, with the sliding supports 3 closer to the welding torch 2 or baffle 12 and the pipe brackets 4 closer to the end of the base 1. A sliding base 31 is arranged at the bottom of the sliding support 3, and the sliding base 31 is mounted on the guide rail 13, so that each set of sliding supports 3 can be moved and adjusted along the guide rail 13.

[0068] The pipe bracket 4 can be fixedly connected to the base 1 or slidably connected. The pipe bracket 4 supports the main body of the pipe 100 or the end of the pipe 100 opposite to the welding end 101. The pipe bracket 4 includes a column 41 connected to the base 1 and an arc-shaped bracket 42 detachably connected to the top of the column 41. The arc-shaped bracket 42 is used to place the pipe 100 for support. Different sizes of arc-shaped brackets 42 can be replaced as needed.

[0069] The bracket drive mechanism 5 can be a motor screw mechanism or a first hydraulic cylinder 51, which is used to drive the two sets of sliding brackets 3 to move towards each other, that is, to drive the two sets of sliding brackets 3 to move closer or further away from each other.

[0070] Each set of sliding brackets 3 is connected to a set of motor screw mechanism or first hydraulic cylinder 51 between the base and the two sets of motor screw mechanism or first hydraulic cylinder 51 operate synchronously, which can drive the two sets of sliding brackets 3 to move closer or further apart.

[0071] A support sleeve 6 is located on the top of the sliding bracket 3. It has a central hole 60 through which the welding end 101 of the pipe 100 passes. During welding, the support sleeve 6 supports the welding end 101 near its end face, thereby supporting the welding end 101. Each set of sliding brackets 3 is equipped with a support sleeve 6 on its top, so that the welding ends 101 of the two pipes 100 can be supported by two support sleeves 6 respectively.

[0072] Each support sleeve 6 is equipped with multiple rollers 7, which are arranged circumferentially along the inner surface of the support sleeve 6. Preferably, the multiple rollers 7 are evenly arranged circumferentially along the inner surface. The pivots at both ends of the rollers 7 are pivotally connected to the cylinder wall of the support sleeve 6, and each roller 7 is rotatable. The rollers 7 extend axially along the support sleeve 6, extending approximately from one end of the support sleeve 6 to the other, and their length is slightly less than the axial length of the support sleeve 6.

[0073] With this configuration, multiple rollers 7 will clamp the wall of the pipe 100 passing through the central hole 60, thereby restricting the axial movement of the pipe 100 relative to the support sleeve 6.

[0074] In one configuration, the pivots at both ends of the rollers 7 can be mounted on elastic supports connected to the wall of the support sleeve 6. This allows multiple rollers 7 to be spread out so that the welded end 101 of the pipe 100 can pass through the central hole 60. Then, the rollers 7 are released, and under the action of the elastic supports, each roller 7 is pressed against the wall of the pipe 100, thereby clamping the pipe 100 by means of multiple rollers 7.

[0075] In another way, the cylinder wall of the support sleeve 6 can be divided into two halves. The two halves of the cylinder wall can be opened and closed by the drive mechanism. When passing through the welding end 100 of the pipe 100, the two halves of the cylinder wall are opened. After the welding end 101 passes through, the two halves of the cylinder wall are closed, so that the inner roller 7 is pressed against the wall surface of the pipe 100, and the pipe 100 can be clamped by multiple rollers 7.

[0076] If necessary, a rough friction surface can be provided on the surface of the roller 7 to increase the friction between it and the wall of the pipe 100, improve the clamping force, and also improve its ability to drive the pipe 100 to rotate.

[0077] The drive motor 8 can be a stepper motor or a servo motor, and it is mounted on the outside or inside the sliding bracket 4. The drive motor 8 is connected to at least one roller 7 via a transmission mechanism, which can be a drive belt, a drive rack, a drive gear set, etc. The drive motor 8 is used to drive the rotation of at least one roller 7.

[0078] When it is necessary to perform circumferential welding on two pipes 100, one pipe 100 is placed on the pipe bracket 4 on one side and pushed toward the support sleeve 6 until the welding end 101 of the pipe 100 passes through the support sleeve 6; the other pipe 100 is operated in the same way. Preferably, the welding ends 101 of the two pipes 100 extend out of the support sleeve 6 by approximately the same length.

[0079] The wall of the pipe 100 is clamped by multiple rollers 7 inside each support sleeve 6.

[0080] Then, the support drive mechanism 5 drives both sets of sliding supports 3 to move toward the middle baffle 12, bringing them closer together until the end faces of the welding ends 101 of the two pipes 100 are aligned and pressed together. The gap between the end faces of the two welding ends 101 is the circumferential seam to be welded.

[0081] By adjusting the welding torch 2 so that its tip 21 is aligned with the circumferential seam, and then activating the drive motors 8 on the two sets of sliding supports 3 to rotate the rollers 7 connected to them, the rollers 7 in turn rotate the pipes 100, allowing both pipes 100 to rotate within their respective support sleeves 6. Since the welding ends 101 of the two pipes 100 are pressed together, the two pipes 100 naturally rotate as a whole. The welding torch 2 then welds along the circumferential seam, thus completing the circumferential seam welding of the pipes 100.

[0082] In this invention, since each pipe 100 is clamped by multiple rollers 7, there is essentially no rotational jamming. Because two sets of drive motors 8 are configured, even if one set 8 fails, the other set can independently drive the pipe 100 to rotate. Since the radius of the rollers 7 is much smaller than the radius of the pipe 100, the rollers 7 will only drive the pipe 100 to rotate slowly, preventing it from rotating too fast. This ensures that the welding ends 101 of both pipes will not slip relative to each other in the initial welding stage, and also ensures sufficient welding time at each position, thus improving welding quality.

[0083] In summary, the pipe circumferential welding device provided by this utility model can not only support the welding ends 101 of two pipes 100, but also actively drive the two pipes 100 to rotate and achieve integrated rotation, maintaining the stability of the welding ends 101 of the pipes 100. This facilitates the rapid connection of the welding ends 101 of the two pipes 100 and avoids relative sliding between the welding ends 101 of the two pipes 100 in the early stage of welding, thereby improving welding quality and welding efficiency.

[0084] In existing technologies, motors directly drive pipes with large radii and heavy weights. This requires a large amount of power from the motor, which results in a large and bulky motor that requires a lot of space for installation.

[0085] In this invention, the drive motor 8 is used to drive the roller 7, which has a smaller radius and lighter weight, to rotate. The drive motor 8 requires relatively little power and its size can be designed to be relatively small, making it easy to install.

[0086] As needed, the uprights 41 of the pipe bracket 4 have a lifting and adjusting function to adjust the height of the arc-shaped bracket 42 so that it is coaxially arranged with the support sleeve 6. The lifting and adjusting function of the uprights 41 can be achieved using existing technologies such as telescopic sleeve structure and lifting slide structure.

[0087] In one embodiment, such as Figure 6-11 As shown, the support sleeve 6 includes two arc-shaped cylindrical walls 61 arranged in half. The two arc-shaped cylindrical walls 61 are assembled on opposite sides of the sliding bracket 3, and an opening 613 is formed between the bottoms of the two arc-shaped cylindrical walls 61.

[0088] A cylinder wall drive mechanism 63 is connected between the two arc-shaped cylinder walls 61 and the sliding bracket 3 to drive the two arc-shaped cylinder walls 61 to move towards each other.

[0089] The multiple rollers 7 include multiple driven rollers 71 and at least one driving roller 72 that is connected to the drive motor 8. Multiple driven rollers 71 are installed on the inner side of each arc-shaped cylindrical wall 61.

[0090] The top of the sliding bracket 3 is provided with a bracket groove 32 that communicates with the opening 613. The active roller 72 is pivotally mounted in the bracket groove 32, and a part of the active roller 72 extends into the center hole 60 of the support sleeve 6 through the opening 613.

[0091] In this embodiment, the support sleeve 6 is divided into two arc-shaped cylindrical walls 61 along the axial direction. Each arc-shaped cylindrical wall 61 has a notch at the bottom, thereby forming an opening 613 between the bottoms of the two arc-shaped cylindrical walls 61. The length of the opening 613 is slightly greater than the length of the roller 7, so that the lower roller 7 can pass through.

[0092] Two arc-shaped cylindrical walls 61 are assembled on the left and right sides of the top of the sliding bracket 3, and a cylindrical wall driving mechanism 63 is assembled between the sliding bracket 3 and the two arc-shaped cylindrical walls 61. This mechanism drives the two arc-shaped cylindrical walls 61 to move closer or further apart, so as to open the two arc-shaped cylindrical walls 61 when passing through the pipe 100, so that the welding end 101 of the pipe 100 can pass through. After the welding end 101 passes through, the two arc-shaped cylindrical walls 61 are brought closer to each other and reset, so that the inner rollers 7 are pressed against the wall surface of the pipe 100. The pipe 100 can be clamped by multiple rollers 7.

[0093] The cylinder wall drive mechanism 63 can employ two sets of second hydraulic cylinders 631, with one set of second hydraulic cylinders 631 installed between each arc-shaped cylinder wall 61 and the side of the sliding bracket 3. Specifically, each arc-shaped cylinder wall 61 has a downwardly extending mounting plate 62 at its lower end, and the second hydraulic cylinder 631 is connected between the mounting plate 62 and the side of the sliding bracket 3.

[0094] In this embodiment, the multiple rollers 7 are divided into driven rollers 71 and driving rollers 72. The driving rollers 72 are connected to the drive motor 8 through a transmission mechanism, while the driven rollers 71 are not connected to the drive motor 8. Multiple driven rollers 71 are installed on the inner side of each arc-shaped cylindrical wall 61.

[0095] The sliding bracket 3 has a bracket groove 32 at its top, and the top opening of the bracket groove 32 is connected to the opening 613. The drive roller 72 is pivotally mounted in the bracket groove 32, and its two ends are pivotally connected to the groove wall of the bracket groove 32, for example, by bearings. A portion of the drive roller 72 extends through the opening 613 into the central hole 60 of the support sleeve 6 to press against the wall of the pipe 100 above.

[0096] With this configuration, when the two arc-shaped cylindrical walls 61 need to be opened, only the driven roller 71 moves with the arc-shaped cylindrical walls 61, while the driving roller 72 and the drive motor 8 remain in their original positions. When the pipe 100 passes through the space between the two opened arc-shaped cylindrical walls 61, it falls onto the lower driving roller 72, which supports the pipe 100. After the two arc-shaped cylindrical walls 61 return to their original positions, the driven roller 71 clamps the wall surface of the pipe 100.

[0097] When the drive motor 8 drives the active roller 72 to rotate, the active roller 72 rotates and drives the pipe 100 to rotate by friction. The pipe 100 will then cause the driven roller 71 to roll. There is rolling friction between the driven roller 71 and the pipe 100. The resistance to the rotation of the pipe 100 is small, which is conducive to the smooth rotation of the pipe 100.

[0098] In one embodiment, such as Figure 6 and Figure 9-10 As shown, multiple driven rollers 71 of the two arc-shaped cylindrical walls 61 are arranged symmetrically in pairs, and each arc-shaped cylindrical wall 61 is provided with driven rollers 71 in the upper half, middle half and lower half.

[0099] After the two arc-shaped cylindrical walls 61 are reset, the left and right sides of the pipe 100 are clamped by multiple pairs of symmetrical driven rollers 71, and the upper, middle and lower halves of the left and right sides are also clamped by driven rollers 71 to improve the clamping effect on the pipe 100.

[0100] In one embodiment, such as Figure 6-10 As shown, each arc-shaped cylindrical wall 61 has a connecting lug 64 at its top, and the two connecting lugs 64 are detachably connected by connecting bolts 65.

[0101] After the two arc-shaped cylindrical walls 61 are reset, the two connecting ear plates 64 are connected together by connecting bolts 65 to prevent the two arc-shaped cylindrical walls 61 from loosening and affecting the clamping effect.

[0102] In one embodiment, such as Figure 6-7 and Figure 14 As shown, the inner surface of the arc-shaped cylinder wall 61 is provided with a cylinder wall groove 611, and the driven roller 71 is pivotally installed in the cylinder wall groove 611, and a part of the driven roller 71 extends into the central hole 60 of the support sleeve 6.

[0103] In this embodiment, a groove 611 is provided on the inner surface of the arc-shaped cylindrical wall 61, and groove walls 612 are provided at both ends of the groove 611 along the axial direction. The rotating shafts at both ends of the driven roller 71 are pivotally connected to the groove walls 612, so that the main body of the driven roller 71 is located in the groove 611, and a small part of it extends into the central hole 60 of the support sleeve 6, which serves to tighten or clamp the pipe 100. This arrangement avoids the driven roller 71 being completely located in the central hole 60, thus avoiding occupying too much space.

[0104] Multiple driven rollers 71 and driving rollers 72 are generally kept on a circle with the central axis of the support sleeve 6 as the center.

[0105] In one embodiment, such as Figure 4 , Figure 6 and Figure 9-11 As shown, a lifting slide plate 33 is installed in the bracket groove 32, and an active roller 72 is pivotally mounted on the top of the lifting slide plate 33.

[0106] A skateboard drive mechanism 9 for driving the lifting skateboard 33 to move up and down is installed in the bracket groove 32.

[0107] The drive motor 8 is connected to the lifting slide plate 33 and can move together with the lifting slide plate 33. The drive motor 8 is connected to the drive roller 72 for transmission.

[0108] In this embodiment, in order to further improve the clamping effect and driving rotation effect of the pipe 100, a scheme is adopted in which the lifting slide plate 33 drives the active roller 72 to press upward.

[0109] Specifically, the lifting slide plate 33 is slidably mounted in the bracket groove 32, and a slide plate drive mechanism 9 is installed in the bracket groove 32. The slide plate drive mechanism 9 is located below the lifting slide plate 33, and its output end is connected to the slide plate drive mechanism 9. The slide plate drive mechanism 9 is used to drive the lifting slide plate 33 to move up and down. The slide plate drive mechanism 9 can be a lifting cylinder or a similar mechanism.

[0110] A mounting bracket 34 is installed on the top surface of the lifting slide plate 33, and the rotating shafts 721 at both ends of the active roller 72 are pivotally mounted on the mounting bracket 34.

[0111] A limiting plate 35 is provided in the bracket groove 32, and the falling lifting slide plate 33 will land on the limiting plate 35.

[0112] In normal conditions, the skateboard drive mechanism 9 is in a retracted state, the lifting skateboard 33 rests on the limit plate 35, and a small portion of the active roller 72 extends into the center hole 60 of the support sleeve 6 through the opening 613.

[0113] Once the pipe 100 is in place and both arc-shaped cylindrical walls 61 have returned to their original positions, the sliding plate drive mechanism 9 drives the lifting sliding plate 33 to move upward a certain distance until the active roller 72 presses against the wall of the pipe 100. This configuration ensures that the active roller 72 can press against the wall of the pipe 100, thereby enabling the pipe 100 to rotate.

[0114] The distance that the lifting slide plate 33 moves upward depends on the radius of the pipe 100. The pipe 100 to be welded is generally a metal pipe, such as a stainless steel pipe, which can withstand the compression of all rollers 7.

[0115] In this embodiment, to ensure that the drive motor 8 can maintain transmission with the lifting and moving active roller 72, the drive motor 8 and the sliding bracket 3 can be assembled in the following way:

[0116] A lifting seat that can slide up and down is provided on the outside of the sliding bracket 3. The drive motor 8 is installed on the lifting seat. The lifting seat or drive motor 8 is connected to the lifting slide plate 33 through a connecting rod / connecting plate. When the lifting slide plate 33 moves up and down, it will drive the lifting seat and drive motor 8 to move up and down together, without affecting the assembly relationship between the drive motor 8 and the active roller 72.

[0117] In one embodiment, such as Figure 6 and Figure 9-11 As shown, the drive motor 8 is mounted on the lifting slide plate 33.

[0118] In this embodiment, the drive motor 8 is directly mounted on the lifting slide plate 33. When the lifting slide plate 33 moves up and down, it will drive the drive motor 8 to move up and down as a whole. The relative positional relationship between the drive motor 8 and the active roller 72 remains fixed and will not affect the assembly relationship between the drive motor 8 and the active roller 72.

[0119] If necessary, heat dissipation holes can be provided in the groove wall of the bracket groove 32 to dissipate heat from the drive motor 8.

[0120] In one embodiment, such as Figure 4 , Figure 6 and Figure 9-11 As shown, three spaced-apart active rollers 72 are installed on the top of the lifting slide plate 33. The three active rollers 72 are arranged in an arc shape with the central axis of the support sleeve 6 as the center. Among them, the middle active roller 72 is located directly below the central axis of the support sleeve 6.

[0121] In this embodiment, three active rollers 72 are used to better drive the upper pipe 100 to rotate.

[0122] In one embodiment, such as Figure 11-13As shown, the drive motor 8 is connected to the middle active roller 72 through the first transmission mechanism 73, and the two active rollers 72 on both sides are respectively connected to the middle active roller 72 through the second transmission mechanism 74.

[0123] In this embodiment, the drive motor 8 is only connected to the central active roller 72 via a transmission mechanism 73, for example, through a first transmission mechanism 73. The first transmission mechanism 73 can be a transmission belt, a transmission rack, or similar connection. A transmission shaft 731 is mounted on the mounting bracket 44 where the active roller 72 is located, and the transmission shaft 731 is positioned below the rotating shaft 721 at one end of the active roller 72. The drive motor 8 is mounted on the lifting slide plate 33, positioned below the active roller 72, and its output shaft is connected to the transmission shaft 731. The transmission shaft 731 is connected to the upper rotating shaft 721 via a transmission belt, a transmission rack, or similar connection. When the drive motor 8 operates, it can drive the central active roller 72 to rotate.

[0124] The other two drive rollers 72 are driven to rotate by the middle drive roller 72. The shaft 721 of the middle drive roller 72 is connected to the shafts 721 of the other two drive rollers 72 via a second transmission mechanism 74, such as a transmission belt or a transmission rack. Thus, the middle shaft 721 drives the two shafts 721 on both sides to rotate synchronously, thereby achieving synchronous rotation of all three drive rollers 72.

[0125] In one embodiment, such as Figure 12-13 As shown, the first transmission mechanism 73 and the second transmission mechanism 74 are located at opposite ends of the middle drive roller 72, which avoids interference between the first transmission mechanism 73 and the second transmission mechanism 74 and facilitates installation.

[0126] As needed, the above technical solutions can be combined to achieve the best technical effect.

[0127] The above are merely the principles and preferred embodiments of this utility model. It should be noted that, for those skilled in the art, several other modifications can be made based on the principles of this utility model, and these modifications should also be considered within the scope of protection of this utility model.

Claims

1. A pipe circumferential welder, comprising a base and a welding torch disposed above the base and adjustable vertically, characterized in that, The base is provided with a sliding bracket and a pipe bracket on opposite sides of the welding torch, respectively. The base is also provided with a bracket drive mechanism for driving the pair of sliding brackets to move towards each other. The top of the sliding bracket is fitted with a support sleeve for the welded end of the pipe to pass through and for supporting the welded end. The support sleeve has multiple rollers spaced circumferentially inside, and the multiple rollers are used to clamp the outer periphery of the pipe. A drive motor is mounted on the sliding bracket, and the drive motor is connected to at least one of the rollers. When the drive motor is in operation, the rollers that are connected to the drive motor are in a rotating state and can drive the pipe sandwiched between the multiple rollers to rotate.

2. The pipe girth welding apparatus of claim 1, wherein, The support sleeve includes two arc-shaped cylindrical walls that are arranged in half. The two arc-shaped cylindrical walls are assembled on opposite sides of the sliding bracket, and an opening is formed between the bottoms of the two arc-shaped cylindrical walls. A cylinder wall drive mechanism is connected between the two arc-shaped cylinder walls and the sliding bracket to drive the two arc-shaped cylinder walls to move towards each other; The multiple rollers include multiple driven rollers and at least one driving roller that is connected to the drive motor. Multiple driven rollers are installed on the inner side of each arc-shaped cylinder wall. The top of the sliding bracket is provided with a bracket groove communicating with the opening. The active roller is pivotally mounted in the bracket groove, and a part of the active roller extends into the central hole of the support sleeve through the opening.

3. The pipe girth welding apparatus of claim 2, wherein, The multiple driven rollers of the two arc-shaped cylindrical walls are arranged symmetrically in pairs. Each of the arc-shaped cylindrical walls is provided with a driven roller in the upper, middle and lower halves.

4. The pipe girth welding apparatus of claim 2, wherein, Each of the arc-shaped cylindrical walls has a connecting lug plate at its top, and the two connecting lug plates are detachably connected by connecting bolts.

5. The pipe girth welding apparatus of claim 2, wherein, The inner surface of the arc-shaped cylinder wall is provided with a cylinder wall groove, the driven roller is pivotally mounted in the cylinder wall groove, and a part of the driven roller extends into the central hole of the support sleeve.

6. The pipe girth welding apparatus of claim 5, wherein, A lifting slide plate is installed in the groove of the bracket, and the active roller is pivotally mounted on the top of the lifting slide plate; The bracket groove is equipped with a skateboard drive mechanism for driving the lifting skateboard to move up and down. The drive motor is connected to the lifting slide plate and can move as a whole with the lifting slide plate. The drive motor is also connected to the active roller drive.

7. The pipe girth welding apparatus of claim 6, wherein, The drive motor is mounted on the lifting slide plate.

8. The pipe girth welding apparatus of claim 6, wherein, The top of the lifting slide plate is equipped with three active rollers arranged at intervals, and the three active rollers are arranged in an arc shape with the central axis of the support sleeve as the center. The central active roller is located directly below the central axis of the support sleeve.

9. The pipe girth welding apparatus of claim 8, wherein, The drive motor is connected to the middle active roller through a first transmission mechanism, and the two active rollers on both sides are respectively connected to the middle active roller through a second transmission mechanism.

10. The pipe girth welding apparatus of claim 9, wherein, The first transmission mechanism and the second transmission mechanism are located at opposite ends of the drive roller in the middle.

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