Automatic welding device for gas heating pipeline

Abstract

The present application relates to the field of pipeline welding device, specifically is a kind of gas heating pipeline automatic welding device, including flexible track, flexible track is provided with the welder for welding pipe fitting by ring rotating mechanism, the welding device further includes driving mechanism for driving ring rotating mechanism, the present application adopts the driving mechanism of external independent to drive flexible steel belt rotation, so that flexible steel belt drives welder circumferential rotation around pipe fitting, to carry out ring seam welding, on the one hand, by separating the driving function from the welding end, the overall weight of the one side of welder is greatly reduced, the moving stability of welder in the welding process is guaranteed;On the other hand, through the combination of movable cart, flexible steel belt, flexible track and welder, the entire welding device can be conveniently split into several independent modules when handling, reduces the labor cost of on-site construction, thereby indirectly improves the overall welding construction efficiency.

Description

Technical Field

[0001] This invention relates to the field of pipeline welding equipment, specifically an automatic welding device for gas heating pipelines. Background Technology

[0002] Gas heating pipelines are an important component of urban energy transmission and heating systems, and are widely used for residential gas supply and district centralized heating projects. For large-diameter gas heating pipelines with thick walls, automatic pipeline welding machines are currently mainly used for welding construction.

[0003] Automatic pipe welding machines mainly consist of flexible tracks, welding trolleys, and control systems. The flexible tracks typically use a steel strip structure and are fixed to the outer wall of the pipe by binding, serving as the travel track for the welding trolley. The welding trolley is positioned above the flexible tracks and integrates a traveling mechanism, a welding torch clamping device, a welding torch posture adjustment mechanism, and a drive motor.

[0004] During welding, the flexible track is fixedly installed on the outer wall of the pipe at the position to be welded, and then the welding trolley is installed on the flexible track. After that, the welding trolley is started, and the trolley's own walking drive mechanism drives it to move along the flexible track. At the same time, the welding torch welds the pipe circumferential seam according to the preset process parameters.

[0005] However, traditional automatic pipe welding machines still have significant shortcomings in practical applications. On the one hand, existing welding trolleys integrate multiple functional components such as a walking mechanism, welding torch clamp and adjustment mechanism, and drive motor, resulting in a large overall weight of the welding trolley (i.e., the welding end). When the welding trolley moves on the flexible track, the large weight increases the resistance between the trolley's drive wheels and the track. At the same time, due to the limited precision of the flexible track itself and the difficulty in achieving ideal clamping and fitting, the trolley's own weight can easily cause phenomena such as swaying, jamming, or slipping, which seriously affects the stability of the welding trolley on the flexible track, and consequently makes it difficult to reliably guarantee the quality of the weld formation.

[0006] On the other hand, existing welding trolleys integrate welding units and self-propelled structures into a single unit. The functional components are tightly connected and cannot be separated. Due to the bulky and large size of the overall structure, disassembly and transportation of the equipment are inconvenient during actual construction, especially when moving between different work areas. This increases the difficulty of on-site construction and labor costs, and reduces construction efficiency.

[0007] To address the aforementioned issues, there is an urgent need in this field for an automatic welding device for gas heating pipelines that can reduce the weight of the welding end, improve the stability of track travel, and facilitate on-site disassembly and relocation. Summary of the Invention

[0008] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: an automatic welding device for gas heating pipelines, including a flexible track, on which a welding device for welding pipe fittings is arranged by a rotating mechanism, and the welding device also includes a driving mechanism for driving the rotating mechanism.

[0009] The circumferential mechanism includes a flexible steel strip detachably connected to a flexible track. The flexible steel strip is detachably connected to the welder. During welding, the flexible steel strip wraps around the outside of the flexible track, causing the welder to rotate around the circumference of the pipe, thereby performing circumferential welding.

[0010] The drive mechanism includes a movable trolley with a base frame mounted on it via a lifting assembly. Two symmetrically arranged gears are rotatably mounted on the base frame. During welding, the trolley moves the gears to directly below the flexible steel strip, and then the lifting assembly drives the two gears to rotate the flexible steel strip together.

[0011] Two gears stably drive the flexible steel belt to rotate, which in turn drives the welder to rotate stably around the pipe fitting, thereby performing circumferential welding.

[0012] Preferably, a threaded rod is rotatably provided at one end of the flexible track, and the threaded rod is threadedly connected to the other end of the flexible track.

[0013] Preferably, the flexible track is provided with several pads on the side near the pipe fitting. By rotating the threaded rod, the flexible track causes the pads to hug the outer surface of the pipe fitting.

[0014] Preferably, one end of the flexible steel strip is fixedly connected to an arc-shaped frame, the flexible steel strip has a number of equally spaced toothed grooves, and a lead screw is rotatably mounted on the arc-shaped frame.

[0015] Preferably, the non-fixed end of the flexible steel strip is detachably connected to the arc-shaped frame, so that the toothed groove on the flexible steel strip engages with the screw thread.

[0016] Preferably, the flexible steel strip is provided with several sets of wheel sets arranged at equal intervals on the side near the pipe fitting. The wheel set consists of an abutting wheel one that abuts against the outside of the flexible track and an abutting wheel two that abuts against the side of the flexible track.

[0017] Preferably, two servo motors are fixedly installed on the base frame. The servo motors drive the gears at corresponding positions to rotate through a belt drive structure, so that the gears drive the flexible steel belt to rotate by meshing with the tooth grooves on the flexible steel belt.

[0018] Preferably, the belt drive structure includes a drive pulley fixedly mounted on the output shaft of the servo motor, a driven pulley fixedly mounted on the gear shaft, and a synchronous belt wound around the outer sides of the drive pulley and the driven pulley.

[0019] Preferably, the welder includes an adjustment assembly bolted to an arc-shaped frame, and a welding torch is connected to the adjustment assembly. During welding, the adjustment assembly finely adjusts the position of the welding torch to weld the weld seam.

[0020] Preferably, the lifting assembly includes an electric cylinder fixedly mounted on the trolley, and the telescopic section of the electric cylinder is fixedly connected to the base frame.

[0021] The beneficial effects of this invention are as follows: First, this invention uses an external, independent drive mechanism to rotate a flexible steel belt, which in turn drives the welder to rotate circumferentially around the pipe fitting for circumferential welding. On the one hand, by separating the drive function from the welding end, the walking mechanism and its supporting drive components integrated on the traditional welding trolley are effectively eliminated, significantly reducing the overall weight of the welder. This significantly reduces the walking resistance of the welder when it follows the rotation of the flexible steel belt, effectively avoiding phenomena such as swaying, jamming, or slippage caused by excessive weight, ensuring the stability of the welder's movement during the welding process, and thus providing a reliable guarantee for the quality of the weld formation. On the other hand, the combination of a movable trolley, flexible steel belt, flexible track, and welder allows the entire welding device to be easily disassembled into several independent modules during transport, greatly improving the ease of transferring the equipment between different work surfaces, reducing on-site construction labor costs, and thus indirectly improving the overall welding construction efficiency.

[0022] Second, this invention uses a movable trolley to move the gears directly below the flexible steel belt. Then, a lifting assembly drives two gears to contact the flexible steel belt, thereby stably driving the flexible steel belt to rotate. This creates a reliable external drive mechanism between the drive mechanism and the circumferential mechanism. The driving power is no longer provided by the welding end itself, but is input from the outside by the gears on the independent trolley. This allows the welder to rotate stably around the pipe through an external, independent high-power driver. This not only avoids the problem of limited power in the drive motor of the traditional trolley affecting the welding speed and quality, but also further improves the stability of the circumferential weld process and the reliability of the welding quality.

[0023] Third, this invention employs a threaded engagement between a lead screw and the toothed grooves on a flexible steel strip. When the lead screw is rotated, the non-fixed end of the flexible steel strip is moved relative to the arc-shaped frame, thus tightly holding the flexible steel strip to the outside of the flexible track. This effectively prevents the flexible steel strip from loosening or shifting during rotation. Simultaneously, the meshing of two gears with the toothed grooves on the flexible steel strip allows the driving force of the gears to be transmitted to the flexible steel strip through the grooves, ensuring the continuity and stability of power transmission. This ensures that the flexible steel strip always adheres to the predetermined trajectory of the flexible track and runs smoothly, ultimately achieving precise positioning and stable movement of the welder during circumferential welding, thereby guaranteeing the forming quality of the circumferential weld. Attached Figure Description

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0025] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 This is a schematic diagram of the structure of the flexible track, flexible steel belt, arc frame and abutment wheel 2 in this invention;

[0027] Figure 3 This is a schematic diagram of the flexible track and threaded rod in this invention;

[0028] Figure 4 This is a schematic diagram of the flexible steel belt, the first abutment wheel, the second abutment wheel, and the arc-shaped frame in this invention;

[0029] Figure 5 This is a partial cross-sectional view of the trolley, servo motor, base frame, and gears in this invention;

[0030] Figure 6 This is a schematic diagram of the structure of the base frame, electric cylinder, servo motor and gear in this invention.

[0031] In the diagram: 1. Flexible track; 2. Rotating mechanism; 3. Welder; 4. Drive mechanism; 11. Threaded rod; 21. Flexible steel belt; 31. Adjustment assembly; 32. Welding torch; 41. Cart; 42. Lifting assembly; 43. Base frame; 44. Gear; 211. Arc frame; 212. Lead screw; 213. First abutment wheel; 214. Second abutment wheel; 421. Electric cylinder; 431. Servo motor. Detailed Implementation

[0032] The embodiments of the present invention are described in detail below. The embodiments described below are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. Where specific techniques or conditions are not specified in the embodiments, they shall be performed in accordance with the techniques or conditions described in the literature in the art or in accordance with the product manual.

[0033] See Figure 1 , Figure 2 and Figure 5 An automatic welding device for gas heating pipelines includes a flexible track 1, on which a welding device 3 for welding pipe fittings is provided via a rotating mechanism 2. The welding device also includes a drive mechanism 4 for driving the rotating mechanism 2.

[0034] Before welding, the operator holds the flexible track 1 tightly and locks it at the designated position on the outside of the pipe fitting. The rotating mechanism 2 is then connected to the flexible track 1, and the welding device 3 is locked to the rotating mechanism 2 so that the welding device 3 can correspond to the weld position of the pipe fitting. Then, the drive mechanism 4 is moved to the designated position of the rotating mechanism 2. During welding, the rotating mechanism 2 is driven to rotate along the flexible track 1 by the independent external drive mechanism 4, so that the rotating mechanism 2 drives the welding device 3 to rotate around the circumference of the pipe fitting, thereby enabling the welding device 3 to perform circumferential welding on the pipe fitting.

[0035] On the one hand, by separating the driving function from the welding end, the walking mechanism and its supporting driving components integrated on the traditional welding carriage are effectively removed, which greatly reduces the overall weight of the welding device 3. This significantly reduces the walking resistance when the welding device 3 rotates, thereby effectively avoiding phenomena such as walking swaying, jamming or slipping caused by excessive weight. This ensures the movement stability of the welding device 3 during the welding process, and thus provides a reliable guarantee for the quality of weld formation.

[0036] On the other hand, the combination of the drive mechanism 4, the rotating mechanism 2, the flexible track 1 and the welder 3 makes the entire welding device easy to disassemble into multiple independent modules during transportation, which greatly improves the ease of transferring the equipment between different work surfaces, reduces the labor cost of on-site construction, and thus indirectly improves the overall welding construction efficiency.

[0037] See Figure 1 , Figure 2 , Figure 3 and Figure 4 The rotating mechanism 2 includes a flexible steel strip 21 detachably connected to the flexible track 1. The flexible steel strip 21 is detachably connected to the welder 3. Before welding, the flexible steel strip 21 is tightly wrapped around the outside of the flexible track 1 so that the flexible steel strip 21 can move stably and closely fit the flexible track 1. Then, during welding, the flexible steel strip 21 wraps around the outside of the flexible track 1 and drives the welder 3 to rotate around the circumference of the pipe to perform circumferential welding.

[0038] See Figure 1 , Figure 5 and Figure 6 The drive mechanism 4 includes a movable trolley 41. A base frame 43 is mounted on the trolley 41 via a lifting assembly 42. Two symmetrically arranged gears 44 are rotatably mounted on the base frame 43. Before welding, the operator manually moves the trolley 41, thereby moving the gears 44 to directly below the flexible steel belt 21. Then, the lifting assembly 42 drives the two gears 44 to move upward to contact the flexible steel belt 21.

[0039] During welding, the welding machine 3 is started to weld the pipe fitting. At the same time, the two gears 44 drive the flexible steel belt 21 to rotate. The two gears 44 stably drive the flexible steel belt 21 to rotate, so that the flexible steel belt 21 drives the welding machine 3 to rotate stably around the pipe fitting, thereby performing circumferential welding.

[0040] To facilitate locking the flexible track 1 onto the pipe fitting, the present invention designs the following structure: (See attached diagram) Figure 1 , Figure 2 and Figure 3 The flexible track 1 has a threaded rod 11 rotatably mounted at one end. The threaded rod 11 is threadedly connected to the other end of the flexible track 1. Before welding, the flexible track 1 is wrapped around the outside of the pipe fitting, so that the threaded rod 11 and the other end of the flexible track 1 form a worm gear type threaded engagement relationship. Several pads are provided on the side of the flexible track 1 near the pipe fitting. When locking the flexible track 1, the operator manually rotates the threaded rod 11, so that the threaded rod 11 pulls the flexible track 1, thereby causing the flexible track 1 to drive the pads to hug the outer surface of the pipe fitting, thus locking the flexible track 1 onto the pipe fitting.

[0041] To facilitate locking the flexible steel strip 21 onto the flexible track 1, the present invention designs the following structure: (See attached diagram) Figure 1 , Figure 2 , Figure 3 and Figure 4 One end of the flexible steel strip 21 is fixedly connected to an arc frame 211. The flexible steel strip 21 has several equally spaced toothed grooves. A lead screw 212 is rotatably mounted on the arc frame 211. The non-fixed end of the flexible steel strip 21 is detachably inserted into the arc frame 211, so that the toothed grooves on the flexible steel strip 21 are threadedly engaged with the lead screw 212.

[0042] Before welding, the flexible steel strip 21 is wrapped around the outside of the flexible track 1. The operator holds the non-fixed end of the flexible steel strip 21 and inserts it into the inside of the arc frame 211, so that the tooth groove on the flexible steel strip 21 and the lead screw 212 form a worm gear thread engagement relationship. Then the operator rotates the lead screw 212, thereby pulling the flexible steel strip 21 through the lead screw 212, and thus locking the flexible steel strip 21 on the outside of the flexible track 1.

[0043] To ensure that the flexible steel belt 21 can rotate smoothly and stably along the flexible track 1 when locked on it, the present invention designs the following structure: (See attached diagram) Figure 2 , Figure 3 and Figure 4 The flexible steel belt 21 is provided with several sets of wheel sets arranged at equal intervals on the side near the pipe fitting. The wheel set consists of an abutment wheel 213 that abuts against the outside of the flexible track 1 and an abutment wheel 214 that abuts against the side of the flexible track 1.

[0044] When the flexible steel belt 21 is tightened, the flexible steel belt 21 drives the first abutment wheel 213 to press against the outside of the flexible track 1, and at the same time, the second abutment wheel 214 presses against the side of the flexible track 1, making the fit between the flexible steel belt 21 and the flexible track 1 tighter and more reliable, effectively preventing the flexible steel belt 21 from loosening or shifting during rotation.

[0045] To facilitate contact between gear 44 and flexible steel belt 21, and to enable gear 44 to mesh with the tooth grooves on flexible steel belt 21, the present invention designs the following structure: (See reference) Figure 1 , Figure 5 and Figure 6 The lifting assembly 42 includes an electric cylinder 421 fixedly mounted on the trolley 41. The telescopic section of the electric cylinder 421 is fixedly connected to the base frame 43. During welding, the piston rod of the electric cylinder 421 extends, thereby pushing the base frame 43 upward, so that the base frame 43 drives two gears 44 to contact the flexible steel belt 21, thereby making the gears 44 mesh with the tooth grooves on the flexible steel belt 21.

[0046] When it is necessary to change the construction location, simply lower the base frame 43 using the electric cylinder 421 to disengage the gear 44 from the flexible steel belt 21, and the trolley 41 can be moved to the next work surface. The operation is simple and quick, further improving the flexibility and efficiency of on-site construction.

[0047] To facilitate stable rotation of the flexible steel belt 21 via gear 44, the present invention designs the following structure: (See reference) Figure 5 and Figure 6 Two servo motors 431 are fixedly installed on the base frame 43. The servo motors 431 drive the gears 44 at corresponding positions to rotate through the belt drive structure, so that the gears 44 drive the flexible steel belt 21 to rotate through the tooth grooves on the flexible steel belt 21. The belt drive structure includes a drive pulley fixedly installed on the output shaft of the servo motor 431, and a driven pulley fixedly installed on the shaft of the gear 44. The drive pulley and the driven pulley are wrapped with a synchronous belt on their outer sides.

[0048] During welding, two servo motors 431 are started simultaneously, causing the output shaft of the servo motors 431 to drive the active pulley to rotate synchronously. The active pulley transmits power to the driven pulley through the synchronous belt, and the driven pulley drives the corresponding gear 44 to rotate synchronously. The two gears 44 mesh with the tooth grooves on the flexible steel belt 21 at the same time, thereby jointly driving the flexible steel belt 21 to rotate smoothly along the circumference of the flexible track 1.

[0049] During this process, the two servo motors 431 adopt a synchronous control strategy to ensure that the speed and direction of the two gears 44 are consistent, so that the flexible steel belt 21 drives the welder 3 to rotate synchronously around the circumference of the pipe, thereby realizing the continuous and stable welding of the circumferential seam of the pipe by the welder 3.

[0050] To facilitate circumferential welding of pipe fittings, the present invention designs the following structure: (See reference) Figure 1 and Figure 2 The welding device 3 includes an adjustment assembly 31 bolted to the arc frame 211. A welding torch 32 is connected to the adjustment assembly 31. During welding, the adjustment assembly 31 finely adjusts the position of the welding torch 32 to weld the weld seam.

[0051] When the flexible steel strip 21 rotates circumferentially along the pipe fitting, the flexible steel strip 21 drives the adjustment component 31 to move synchronously, so that the adjustment component 31 drives the welding torch 32 to weld the circumferential seam. In this embodiment, the adjustment component 31 adopts the posture adjustment mechanism on the traditional welding carriage, which enables it to accurately position the welding torch 32 in the X, Y, and Z directions. During welding, the operator or control system can adjust the pointing angle, centering position, and distance between the welding torch 32 and the pipe fitting surface in real time by adjusting the adjustment component 31 according to the preset welding process parameters, so as to ensure that the welding wire of the welding torch 32 is aligned with the center of the weld and maintains the optimal extension length and welding tilt angle, thereby ensuring that the weld is full and uniform and effectively improving the welding quality.

[0052] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0053] Furthermore, the terms "first," "second," "number one," and "number two" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," "number one," or "number two" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0054] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0055] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. An automatic welding device for gas heating pipelines, comprising a flexible track, characterized in that, A welder for welding pipe fittings is installed on the flexible track via a circumferential mechanism. The welding device also includes a drive mechanism for driving the circumferential mechanism. The circumferential mechanism includes a flexible steel strip detachably connected to a flexible track. The flexible steel strip is detachably connected to the welder. During welding, the flexible steel strip wraps around the outside of the flexible track, causing the flexible steel strip to drive the welder to rotate around the circumference of the pipe, thereby performing circumferential welding. The drive mechanism includes a movable trolley with a base frame mounted on it via a lifting assembly. Two symmetrically arranged gears are rotatably mounted on the base frame. During welding, the trolley is moved to move the gears directly under the flexible steel strip, and then the lifting assembly drives the two gears to rotate the flexible steel strip together. Two gears stably drive the flexible steel belt to rotate, which in turn drives the welder to rotate stably around the pipe fitting, thereby performing circumferential welding.

2. The automatic welding device for gas heating pipelines according to claim 1, characterized in that, The flexible track is rotatably provided with a threaded rod at one end, and the threaded rod is threadedly connected to the other end of the flexible track.

3. The automatic welding device for gas heating pipelines according to claim 2, characterized in that, Several pads are provided on the side of the flexible track near the pipe fitting. By rotating the threaded rod, the flexible track causes the pads to hug the outer surface of the pipe fitting.

4. The automatic welding device for gas heating pipelines according to claim 1, characterized in that, One end of the flexible steel strip is fixedly connected to an arc-shaped frame, and the flexible steel strip has several equally spaced toothed grooves. A lead screw is rotatably mounted on the arc-shaped frame.

5. The automatic welding device for gas heating pipelines according to claim 4, characterized in that, The non-fixed end of the flexible steel strip is detachably inserted into the arc-shaped frame, so that the toothed groove on the flexible steel strip engages with the screw thread.

6. The automatic welding device for gas heating pipelines according to claim 4, characterized in that, The flexible steel strip is provided with several sets of wheel groups arranged at equal intervals on the side near the pipe. Each wheel group consists of an abutting wheel one that abuts against the outside of the flexible track and an abutting wheel two that abuts against the side of the flexible track.

7. The automatic welding device for gas heating pipelines according to claim 4, characterized in that, Two servo motors are fixedly installed on the base frame. The servo motors drive the gears at corresponding positions to rotate through the belt drive structure, so that the gears drive the flexible steel belt to rotate by meshing with the grooves on the flexible steel belt.

8. An automatic welding device for gas heating pipelines according to claim 7, characterized in that, The belt drive structure includes a drive pulley fixedly mounted on the output shaft of a servo motor, a driven pulley fixedly mounted on a gear shaft, and a synchronous belt wound around the outer sides of both the drive pulley and the driven pulley.

9. An automatic welding device for gas heating pipelines according to claim 4, characterized in that, The welding device includes an adjustment assembly bolted to an arc-shaped frame, and a welding torch is connected to the adjustment assembly. During welding, the adjustment assembly finely adjusts the position of the welding torch to weld the weld seam.

10. An automatic welding device for gas heating pipelines according to claim 1, characterized in that, The lifting assembly includes an electric cylinder fixedly mounted on a trolley, with the telescopic section of the electric cylinder fixedly connected to the base frame.

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