Pipeline welding positioning device for water plant construction and welding method

Abstract

The invention relates to the technical field of welding, in particular to a pipeline welding positioning device for water plant construction and a welding method. Comprising at least two rotating base plates, and a power rod is rotationally connected between the two rotating base plates. According to the pipeline welding positioning device for water plant construction and the welding method, according to the shape of a pipeline needing to be welded, the two rotating base plates are arranged to be in a coaxial horizontal state so as to be matched with a linear pipeline; the single rotating chassis rotates to adapt to the L-shaped pipeline; the double rotating base plates synchronously rotate to form a positioning structure of the U-shaped pipeline, after the correct postures of the rotating base plates are determined, the two ends of the pipeline are accurately and firmly fixed through the positioning mechanism, through switching of different states of the two rotating base plates, pipelines in different shapes such as a linear shape, an L shape and a U shape can be rapidly matched without replacing a special clamp, and the positioning structure is simple and convenient to operate. And the tedious operation of replacing a clamp or carrying out complex adjustment is omitted, and the flexibility of meeting diversified pipeline welding requirements is greatly improved.

Description

Technical Field

[0001] This invention relates to the field of welding technology, and more specifically, to a welding positioning device and welding method for pipelines used in water plant construction. Background Technology

[0002] Pipeline welding positioning devices for water plant construction are designed specifically to solve the problem of pipeline welding positioning during water plant construction. They typically include a clamping structure for fixing the pipeline, which can stably clamp the pipeline to be welded and prevent it from shifting or misaligning during the welding process; they also have precise positioning components, which can help the pipeline achieve accurate docking quickly, reduce the trouble of multiple adjustments, and shorten the construction time.

[0003] Traditional pipe welding positioning devices are mostly integrated designs and are usually only designed for a single pipe type. Common devices can only be used for straight pipes and are difficult to fix for L-shaped, U-shaped, or other special bends. If different shaped pipes need to be welded, special clamps often have to be replaced. These special clamps are not only expensive, but the replacement process is also cumbersome and requires a lot of time and manpower. Alternatively, operators may need to perform complex adjustments, such as finely calibrating the angle and position of the clamps. However, this process is not only time-consuming and labor-intensive, but is also prone to errors due to human factors. It is difficult to flexibly and accurately meet the diverse pipe welding needs, which greatly increases the complexity of the operation and seriously affects the construction progress and efficiency. Furthermore, during the welding process, if only the two ends of the pipe are fixed, misalignment is very likely to occur at the pipe joint under the high temperature and external force of welding. Misalignment will cause uneven weld gap and misalignment, which will prevent the weld pool from forming normally and cause problems such as incomplete penetration, slag inclusion, and porosity. In view of this, we propose a pipe welding positioning device and welding method for water plant construction. Summary of the Invention

[0004] The purpose of this invention is to provide a pipe welding positioning device and welding method for water plant construction, in order to solve the problems mentioned in the background art, such as the need to change special clamps or make complex adjustments to adapt to pipes of different shapes, which is labor-intensive, time-consuming and prone to errors; and the problem that fixing only the two ends of the pipe can easily lead to misalignment of the interface and welding defects.

[0005] To address the aforementioned technical problems, one objective of this invention is to provide a pipe welding positioning device for water plant construction, comprising at least: Two rotating chassis, with a power rod rotatably connected between the two rotating chassis; Two adjustment mechanisms are respectively mounted on one side of the rotating chassis; Two positioning mechanisms are respectively installed on the top of the rotating chassis; When the two rotating chassis are kept coaxial and horizontal, they are used to adapt to straight pipes; when a single rotating chassis rotates, it automatically switches to L-shaped pipe positioning mode; when the two rotating chassis rotate synchronously, they form a U-shaped pipe positioning structure. When the rotating chassis rotates, it drives the adjustment mechanism to rotate synchronously. At the same time, the adjustment mechanism extends to the corresponding pipe interface and elastically fixes the pipe.

[0006] The beneficial effects of this invention are: 1. In this invention, adjustments can be made according to different pipe shapes without changing clamps or performing complex adjustment steps. When the two rotating bases are kept coaxial and horizontal, they can be used for positioning and clamping of straight pipes; when a single rotating base rotates, it is suitable for L-shaped pipes; when the two rotating bases rotate synchronously, a U-shaped pipe positioning structure is formed, thereby realizing rapid conversion and precise positioning of pipes of different shapes. The clamping method designed for the characteristics of different pipe shapes such as straight, L-shaped and U-shaped ensures that the pipe will not shift due to insecure fixing during the processing, avoiding weld quality problems caused by interface misalignment, such as incomplete penetration, slag inclusion, porosity and other defects, and enhancing the strength and sealing of the welded joint.

[0007] 2. In this invention, the elastic fixing function of the adjusting mechanism can extend to the pipe interface under the drive of the rotating chassis and provide a stable elastic fixation to the interface, ensuring the accuracy and tightness of the pipe connection, reducing errors caused by human factors, and guaranteeing the quality of the pipe connection. At the same time, this linkage mechanism ensures the correct position and angle of the pipe throughout the entire connection process, further reducing the problem of inaccurate connection, and helping to improve the stability and safety of the entire pipeline system. It not only improves work efficiency but also significantly improves welding quality, providing a reliable guarantee for water plant construction.

[0008] As a further improvement to this technical solution, both ends of the power rod are threaded with fixing caps, and both ends of the power rod are arc-shaped. The fixing caps are used to fix the power rod and the rotating chassis. Both of the adjustment mechanisms include a hydraulic telescopic rod fixedly connected inside the rotating chassis. One end of the hydraulic telescopic rod is fixedly connected to a clamping block. The front and back of the clamping block are provided with slide rails. A slider is slidably connected inside the slide rail, and two inclined rods are rotatably connected to the slider. One end of each of the two inclined rods is rotatably connected to an auxiliary rod. One end of the auxiliary rod is fixedly connected to an arc-shaped clamping block. The top of the front and back of the clamping block is provided with a sliding groove, and the sliding groove is adapted to the auxiliary rod for sliding. The slider is adapted to the slide rail. A buffer rod is fixedly installed inside the slide rail, and the top of the buffer rod is fixedly connected to the bottom of the slider.

[0009] The beneficial effect of adopting the above-mentioned further solution is that the arc-shaped design at both ends of the power rod and the fixed cap of the threaded connection work together to make the connection between the power rod and the rotating chassis more secure and stable. The fixed cap can effectively prevent the power rod from loosening or shifting during device operation or pipeline welding by thread locking, ensuring the structural stability of the two rotating chassis when in the adjustment state, and providing a reliable connection basis for the positioning and switching of different pipeline types.

[0010] As a further improvement to this technical solution, both sets of positioning mechanisms include a support frame fixedly connected to the top surface of the rotating chassis. A first clamping block is fixedly connected to the bottom inside the support frame, and a second clamping block is slidably connected to the top inside the support frame. An electric telescopic rod is fixedly connected to the top of the second clamping block. Protrusions are fixedly connected to both sides of the first clamping block. The protrusions slide inside the moving track and are adapted to the moving track. Both the first and second clamping blocks are arc-shaped, and arc-shaped pads are installed inside both the first and second clamping blocks. The electric telescopic rod is connected to the top of the support frame and is used to drive the second clamping block to move up and down.

[0011] The beneficial effect of adopting the above-mentioned further solution is that the design of the two sets of positioning mechanisms further improves the positioning effect and adaptability of the two ends of the pipe. The support frame provides a stable installation foundation for the entire positioning mechanism. The first clamping block is fixed to the bottom inside the support frame, and the electric telescopic rod drives the second clamping block to slide up and down along the top inside the support frame. Through the relative movement of the first clamping block and the second clamping block, the clamping space can be flexibly adjusted to adapt to pipes of different diameters.

[0012] The second objective of this invention is to provide a method for welding pipes used in water plant construction, applicable to the welding positioning device for water plant construction described in any one of the above-mentioned methods, comprising the following steps: Step 1: Adjust and fix the rotating base according to the shape of the pipe to make it fit the shape of the pipe; The second step is to activate the hydraulic telescopic rod in the adjustment mechanism, which will drive the clamping block to extend to the pipe interface and place the pipe interface between the two arc-shaped clamping blocks. The pipe will squeeze the arc-shaped clamping blocks, and the auxiliary rod, the inclined rod and the slider will work together in the slide rail to achieve elastic fixation with the buffer rod. At the same time, the electric telescopic rod of the positioning mechanism will be activated to drive the second clamping block to move towards the first clamping block. The arc-shaped clamping blocks and the internal arc-shaped pads will be used to tightly fit the two ends of the pipe to complete the fixation. The third step is to calibrate the position of the pipe interface to ensure that there is no offset or misalignment. Select the appropriate welding process (such as electric arc welding, hot melt welding, etc.) according to the pipe material and carry out the welding operation. During welding, pay attention to the clamping status of the device to prevent pipe displacement.

[0013] The beneficial effects of this invention are: 1. The pipeline welding positioning device and welding method used in this water plant construction, based on the required pipeline shape, sets two rotating bases to a coaxial horizontal state to adapt to straight pipelines; a single rotating base rotates to adapt to L-shaped pipelines; the two rotating bases rotate synchronously to form a positioning structure for U-shaped pipelines. After determining the correct posture of the rotating bases, the positioning mechanism accurately and firmly fixes both ends of the pipeline. By switching between different states of the two rotating bases, it is possible to quickly adapt to pipelines of different shapes such as straight, L-shaped, and U-shaped without changing special clamps, eliminating the tedious operation of changing clamps or making complex adjustments, greatly improving the flexibility to meet diverse pipeline welding needs, and making the operation process more efficient. Corresponding clamping methods are designed for the structural characteristics of different shaped pipelines. The positioning mechanism and the adjustment mechanism work together to firmly fix the pipeline, avoiding displacement of the pipeline due to insecure fixing during processing, thus ensuring the accuracy of the welding process from the foundation.

[0014] 2. The pipeline welding positioning device and welding method used in the construction of this water plant involves adjusting two rotating base plates to conform to the shape of the target pipeline, and then using a positioning mechanism to firmly fix both ends of the pipeline. At the same time, the adjusting mechanism rotates synchronously with the rotating base plates and extends to the joint for elastic fixation. This solves the problem that fixing only the two ends of the pipeline can easily lead to misalignment of the joint. The elastic fixation not only ensures the accuracy and tightness of the pipeline connection and reduces errors caused by human factors, but also avoids stress concentration caused by rigid fixation at the joint. It effectively prevents uneven gaps and misalignment of the weld, thereby reducing defects such as incomplete penetration, slag inclusion, and porosity, and significantly enhancing the strength and sealing of the welded joint. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure assembly of the present invention; Figure 2 This is a diagram illustrating the positioning of a straight pipe according to the present invention. Figure 3 This is a diagram illustrating the positioning of the U-shaped pipe according to the present invention. Figure 4 This is a diagram illustrating the positioning of the L-shaped pipe according to the present invention. Figure 5 This diagram illustrates the cooperation relationship between the adjustment mechanism and the positioning mechanism of the present invention. Figure 6 This is a schematic diagram of the positioning mechanism of the present invention; Figure 7 This is a schematic diagram of the adjustment mechanism of the present invention.

[0016] The meanings of the various markings in the diagram are as follows: 100. Rotating chassis; 200. Power rod; 300. Adjustment mechanism; 301. Clamping block; 302. Slide rail; 303. Diagonal bar; 304. Auxiliary rod; 305. Arc-shaped clamping block; 3021. Buffer rod; 400. Positioning mechanism; 401. Support frame; 402. First clamping block; 403. Second clamping block. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example

[0018] like Figure 1-7 As shown, one of the objectives of this invention is to provide a pipe welding positioning device for water plant construction, comprising at least: Two rotating chassis 100 are connected by a power rod 200. Two adjustment mechanisms 300 are respectively mounted on one side of the rotating chassis 100; Two positioning mechanisms 400 are respectively installed on the top of the rotating chassis 100; When the two rotating chassis 100 are kept coaxial and horizontal, they are used to adapt to straight pipes; when a single rotating chassis 100 rotates, it automatically switches to L-shaped pipe positioning mode; when the two rotating chassis 100 rotate synchronously, they form a U-shaped pipe positioning structure. When the rotating chassis 100 rotates, it drives the adjusting mechanism 300 to rotate synchronously. At the same time, the adjusting mechanism 300 extends to the corresponding pipe interface and elastically fixes the pipe.

[0019] Therefore, based on the above features, the improvements of the present invention will be described in detail: Pipeline welding positioning devices often adopt an integrated design and are typically designed for a single pipe type. They are only suitable for straight pipes or bends at specific angles. When adapting to pipes with different orientations, it is often necessary to change to a special clamp or perform complex adjustments, making it difficult to flexibly meet diverse pipeline welding needs and exacerbating the complexity of the operation. Therefore, when the two rotating bases 100 are in an axially horizontal state, the positioning mechanism 400 on the rotating base 100 can position and clamp the straight pipe. When a single rotating base 100 rotates, the positioning mechanism 400 can clamp and fix the L-shaped pipe. When the two rotating bases 100 rotate synchronously, the positioning mechanism 400 can clamp and fix the U-shaped pipe. This achieves the function of quickly switching between fixing operations for pipes of different shapes. For the structural characteristics of different pipe shapes, such as the axial symmetry of straight pipes, the corners of L-shaped pipes, and the arc segments of U-shaped pipes, corresponding clamping methods are designed, such as the adaptable clamping of the adjusting mechanism 300, which can prevent displacement of the pipe due to insecure fixing during processing and ensure the accuracy of the welding process.

[0020] If only the two ends of the pipe are fixed, misalignment can easily occur at the pipe joint during welding. Misalignment can lead to uneven weld gaps or even edge misalignment, preventing the weld pool from forming properly and resulting in defects such as incomplete penetration, slag inclusions, and porosity. This severely weakens the strength and sealing of the weld joint. Therefore, during pipe processing or installation, two rotating bases 100 can be adjusted to accommodate pipes of different shapes, such as straight, L-shaped, and U-shaped pipes. The positioning mechanism 400 fixes both ends of the pipe. When the two rotating bases 100 rotate, they simultaneously drive the two adjusting mechanisms 300 to rotate synchronously, extending the adjusting mechanisms 300 to the pipe joint. Afterwards, the pipe joints can be flexibly fixed. On the one hand, the rotation of the rotating base 100 can directly drive the adjusting mechanism 300 to move synchronously, ensuring the coordination between the components when adjusting the pipe position or joints. This allows the adjusting mechanism 300 to extend to the pipe joint and flexibly fix the joint, ensuring the accuracy and tightness of the pipe connection, reducing errors caused by human factors, and guaranteeing the quality of the pipe connection. On the other hand, it can ensure that the pipe maintains the correct position and angle during the connection process, reducing misalignment caused by positional deviation, helping to guarantee the quality of the pipe connection and avoid leakage and other potential failures.

[0021] Based on the above, the specific structure will be disclosed in detail: Considering the need to fix pipes of different shapes, such as Figures 2-4As shown, both ends of the power rod 200 are threaded with fixing caps, and both ends of the power rod 200 are arc-shaped, making the rotation between the power rod 200 and the two rotating bases 100 smoother. The fixing caps are used to fix the power rod 200 and the rotating bases 100. Therefore, for straight pipes: Figure 2 As shown, rotate rotating base 100 a and rotating base 100 b to a coaxial horizontal state, tighten the fixing cap on the power rod 200 to fix it to the two rotating bases 100, and then start the positioning mechanism 400 to fix both ends of the pipe. U-shaped pipe: such as Figure 3 As shown, first rotate rotating base 100 (a) 90 degrees along direction a1, then rotate rotating base 100 (b) 90 degrees along direction b1, so that the two ends of the U-shaped pipe can be fixed by the positioning mechanisms 400 on the two rotating bases 100. After the positioning mechanisms 400 fix the two ends of the pipe, tighten the fixing cap on the power rod 200 to lock the position of the two rotating bases 100.

[0022] L-shaped pipe: such as Figure 4 As shown, rotating base 100 a remains stationary, rotating base 100 b is rotated 90 degrees along direction b2, and then power rod 200 is rotated 45 degrees along direction a2. When power rod 200 rotates, it will drive rotating base 100 b to move from position b2 to position b3, so that positioning mechanism 400 can fix both ends of L-shaped pipe. Finally, tighten the fixing cap on power rod 200 to complete the fixation. In the above way, pipes of different shapes can be fixed. Whether it is the axial alignment of a straight type, the double-end corner of a U-shape, or the single-end deflection of an L-shape, the angle adjustment of rotating base 100 and the displacement linkage of power rod 200 can be used to ensure that the clamping surface of positioning mechanism 400 is always perpendicular to both ends of the pipe.

[0023] Furthermore, to achieve stable support at the pipe interface, the adjustment mechanism 300 is disclosed in detail, such as... Figures 5-6As shown, both adjusting mechanisms 300 include hydraulic telescopic rods fixedly connected inside the rotating chassis 100. One end of each hydraulic telescopic rod is fixedly connected to a clamping block 301. Slide rails 302 are provided on both the front and back of the clamping block 301. A slider is slidably connected inside each slide rail 302, and two inclined rods 303 are rotatably connected to the slider. One end of each inclined rod 303 is rotatably connected to an auxiliary rod 304, and one end of each auxiliary rod 304 is fixedly connected to an arc-shaped clamping block 305. Therefore, when fixing the pipe, the two rotating chassis 100 are first adjusted to a suitable position. The clamping block 301 is then extended to the vicinity of the pipe interface using the hydraulic telescopic rods. The pipe interface is then placed inside the clamping block 301, so that the outer wall of the pipe contacts the inner wall of the two arc-shaped clamping blocks 305. As the pipe is gradually inserted, it exerts pressure on the two arc-shaped clamping blocks 305. The force drives the two auxiliary rods 304 to move to both sides of the pipe, which in turn causes the two inclined rods 303 to move the slider upward within the slide rail 302. Finally, the two arc-shaped clamps 305 cooperate with the clamping block 301 to clamp and fix pipes of different diameters, avoiding misalignment at the interface. On the one hand, when the pipe squeezes the arc-shaped clamps 305, the squeezing force is transmitted to the slider through the auxiliary rods 304 and inclined rods 303, so that the clamping force is automatically adjusted according to the pipe diameter. The larger the pipe diameter, the greater the reverse pressure applied by the clamping structure, which can firmly fix large-diameter pipes and prevent small-diameter pipes from being pinched. On the other hand, the arc-shaped clamps 305 are made of buffer material and are combined with an adjustable clamping structure, which can adapt to rigid pipes such as steel pipes and cast iron pipes, as well as flexible materials such as PVC pipes and copper pipes, avoiding fixation damage caused by material differences and expanding the application scenarios of the device.

[0024] Specifically, the clamping block 301 has sliding grooves on the top of both its front and back sides, and these grooves are adapted to the auxiliary rod 304 for sliding. The sliding grooves of the clamping block 301 and the auxiliary rod 304 provide a precise sliding track for the auxiliary rod 304, preventing it from shifting or getting stuck when the pipe is squeezed. When the pipe pushes the arc-shaped clamping block 305 to move the auxiliary rod 304, the sliding grooves can restrict the direction of movement of the auxiliary rod 304, ensuring that the linkage between the inclined rod 303 and the slider accurately transmits the clamping force and prevents clamping failure due to movement deviation. The slider is adapted to the slide rail 302, and a buffer rod 3021 is fixedly installed inside the slide rail 302. The top of the buffer rod 3021 is flush with the slider. The bottom fixed connection buffer rod 3021 consists of a buffer spring and a rubber column. The buffer spring is sleeved on the rubber column. In the initial state, the buffer rod 3021 is in a compressed state. When the arc-shaped clamping block 305 is subjected to the squeezing force of the pipe, it will drive the auxiliary rod 304 to slide to both sides of the pipe, causing the slider to move upward and stretch the buffer rod 3021. When the pipe is removed, the squeezing force on the buffer rod 3021 is released, which will drive the arc-shaped clamping block 305 to return to the initial position. The deformation process of the buffer rod 3021 from compression to stretching can buffer the impact force when the pipe squeezes the arc-shaped clamping block 305 through elastic force, avoid damage to the clamping structure due to rigid collision, and ensure that the clamping force is evenly applied to the outer wall of the pipe.

[0025] However, to achieve positioning at both ends of the pipeline, the positioning mechanism 400 needs to be disclosed in detail, specifically as follows: Figure 7 As shown, both sets of positioning mechanisms 400 include a support frame 401 fixedly connected to the top surface of the rotating chassis 100. A first clamping block 402 is fixedly connected to the bottom inside the support frame 401, and a second clamping block 403 is slidably connected to the top inside the support frame 401. An electric telescopic rod is fixedly connected to the top of the second clamping block 403. Therefore, when it is necessary to position both ends of the pipe, the electric telescopic rod is activated to drive the second clamping block 403 to move towards the first clamping block 402, thereby fixing the pipe between the two clamping blocks. The electric drive can precisely adjust the moving distance and clamping force of the clamping blocks to ensure that the position of pipes of different diameters is stable when fixed, avoid deviations caused by manual operation, and provide reliable support for the welding or installation of pipe joints.

[0026] Specifically, both sides of the support frame 401 are provided with moving tracks. Both sides of the first clamping block 402 are fixedly connected with protrusions. The protrusions slide inside the moving tracks and are adapted to the moving tracks to provide a precise sliding track for the clamping blocks, preventing them from shifting or getting stuck under the drive of the electric telescopic rod. When the second clamping block 403 moves toward the first clamping block 402, the limiting effect of the protrusions in the tracks can ensure that the two clamping blocks are precisely aligned along the axial direction, preventing pipe clamping misalignment caused by the skewness of the clamping blocks. Both the first clamping block 402 and the second clamping block 403 are arc-shaped, and both the first clamping block 402 and the second clamping block 403 are equipped with arc-shaped pads inside. The electric telescopic rod is connected to the top of the support frame 401 and is used to drive the second clamping block 403 to move up and down. The arc-shaped design of the first clamping block 402 and the second clamping block 403 can fit tightly against the outer wall of the pipe, increase the contact area, make the clamping force evenly distributed, and avoid local stress concentration.

[0027] The second objective of this invention is to provide a method for welding pipes used in water plant construction, applicable to any of the above-mentioned pipe welding positioning devices for water plant construction, comprising the following steps: Step 1: Adjust the rotating base by 100 degrees and fix it according to the shape of the pipe to make it fit the shape of the pipe. The second step involves activating the hydraulic telescopic rod in the adjusting mechanism 300, which causes the clamping block 301 to extend to the pipe interface, placing the pipe interface between the two arc-shaped clamping blocks 305. The pipe presses against the arc-shaped clamping blocks 305, and through the linkage of the auxiliary rod 304, the inclined rod 303, and the slider in the slide rail 302, elastic fixation is achieved in conjunction with the buffer rod 3021. At the same time, the electric telescopic rod of the positioning mechanism 400 is activated, driving the second clamping block 403 to move towards the first clamping block 402. The arc-shaped clamping blocks 305 and the internal arc-shaped pads tightly adhere to both ends of the pipe, completing the fixation. The third step is to calibrate the position of the pipe interface to ensure that there is no offset or misalignment. Select the appropriate welding process, such as electric arc welding or hot melt welding, according to the pipe material, and carry out the welding operation. During welding, pay attention to the clamping status of the device to prevent pipe displacement.

[0028] Working principle of the invention: Device preparation: Check the connection status of the rotating chassis 100, power rod 200, adjustment mechanism 300 and positioning mechanism 400 to ensure that each component is stable and not loose; Adapting to pipe shape: Adjust the angle of the two rotating bases 100 according to the shape of the pipe to be welded so that the device adapts to the pipe shape, and fix the rotating bases 100 with fixing caps to stabilize the device structure. Pipe positioning and clamping: Activate the hydraulic telescopic rod of the adjustment mechanism 300 to drive the clamping block 301 to extend to the pipe interface, place the interface between the two arc-shaped clamping blocks 305, the pipe squeezes the arc-shaped clamping block 305, and the linkage auxiliary rod 304, inclined rod 303 and slider in slide rail 302, and achieve elastic fixation with buffer rod 3021. At the same time, activate the electric telescopic rod of the positioning mechanism 400 to drive the second clamping block 403 to move towards the first clamping block 402, and use the arc-shaped clamping block 305 and the internal arc-shaped pad to tightly fit the two ends of the pipe to complete rigid fixation; Welding operation: Calibrate the position of the pipe joint to ensure no offset or misalignment. Select the corresponding welding process, such as arc welding or hot melt welding, according to the pipe material and carry out the welding operation. During the welding process, continuously observe the clamping status of the device to prevent the pipe from shifting. Post-weld treatment: After welding, wait for the weld to cool naturally, check the weld surface for defects such as pores and cracks, loosen the 200 fixing cap of the power rod, turn off the hydraulic and electric telescopic rods to reset the device, remove the welded pipe, and clean and maintain the device to prepare it for the next use.

[0029] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pipe welding positioning device for water plant construction, characterized in that: At least including: Two rotating chassis (100) are rotatably connected to each other by a power rod (200). Two adjustment mechanisms (300) are respectively mounted on one side of the rotating chassis (100); Two positioning mechanisms (400) are respectively mounted on the top of the rotating chassis (100); When the two rotating chassis (100) are kept coaxial and horizontal, they are used to adapt to straight pipes; when a single rotating chassis (100) rotates, it automatically switches to L-shaped pipe positioning mode; when the two rotating chassis (100) rotate synchronously, they form a U-shaped pipe positioning structure. When the rotating chassis (100) rotates, it drives the adjusting mechanism (300) to rotate synchronously. At the same time, the adjusting mechanism (300) extends to the corresponding pipe interface and elastically fixes the pipe.

2. The pipeline welding positioning device for water plant construction according to claim 1, characterized in that: Both ends of the power rod (200) are threaded with fixing caps, and both ends of the power rod (200) are arc-shaped. The fixing caps are used to fix the power rod (200) and the rotating chassis (100).

3. The pipeline welding positioning device for water plant construction according to claim 1, characterized in that: Both of the adjustment mechanisms (300) include a hydraulic telescopic rod fixedly connected inside the rotating chassis (100). One end of the hydraulic telescopic rod is fixedly connected to a clamping block (301). The clamping block (301) has slide rails (302) on both its front and back sides.

4. The pipeline welding positioning device for water plant construction according to claim 3, characterized in that: The slide rail (302) has a slider internally connected to it, and two inclined rods (303) are rotatably connected to the slider. One end of each of the two inclined rods (303) is rotatably connected to an auxiliary rod (304), and one end of the auxiliary rod (304) is fixedly connected to an arc-shaped clamp (305).

5. The pipeline welding positioning device for water plant construction according to claim 4, characterized in that: The clamping block (301) has a sliding groove on the top of both the front and back sides, and the sliding groove is adapted to the auxiliary rod (304) for sliding. The slider is adapted to the slide rail (302), and a buffer rod (3021) is fixedly installed inside the slide rail (302), and the top of the buffer rod (3021) is fixedly connected to the bottom of the slider.

6. The pipeline welding positioning device for water plant construction according to claim 1, characterized in that: Both sets of positioning mechanisms (400) include a support frame (401) fixedly connected to the top surface of the rotating chassis (100). A first clamping block (402) is fixedly connected to the bottom inside the support frame (401), and a second clamping block (403) is slidably connected to the top inside the support frame (401). An electric telescopic rod is fixedly connected to the top of the second clamping block (403).

7. The pipeline welding positioning device for water plant construction according to claim 6, characterized in that: Both sides of the first clamping block (402) are fixedly connected with protrusions, which slide inside the moving track and are adapted to the moving track.

8. The pipeline welding positioning device for water plant construction according to claim 6, characterized in that: The first clamping block (402) and the second clamping block (403) are both arc-shaped, and arc-shaped pads are installed inside the first clamping block (402) and the second clamping block (403).

9. The pipeline welding positioning device for water plant construction according to claim 7, characterized in that: The electric telescopic rod is connected to the top of the support frame (401) and is used to drive the second clamping block (403) to move up and down.

10. A method for welding pipes used in water plant construction, applied to the pipe welding positioning device for water plant construction as described in any one of claims 1-9, characterized in that, Includes the following steps: Step 1: Adjust and fix the rotating base (100°) according to the shape of the pipe to make it fit the shape of the pipe; The second step is to activate the hydraulic telescopic rod in the adjustment mechanism (300) to extend the clamping block (301) to the pipe interface and place the pipe interface between the two arc-shaped clamping blocks (305). The pipe squeezes the arc-shaped clamping block (305). Through the linkage of the auxiliary rod (304), the inclined rod (303) and the slider in the slide rail (302), and with the buffer rod (3021), elastic fixation is achieved. At the same time, the electric telescopic rod of the positioning mechanism (400) is activated to drive the second clamping block (403) to move towards the first clamping block (402). The arc-shaped clamping block (305) and the internal arc-shaped pad tightly fit the two ends of the pipe to complete the fixation. The third step is to calibrate the position of the pipe interface to ensure that there is no offset or misalignment. Select the appropriate welding process (such as electric arc welding, hot melt welding, etc.) according to the pipe material and carry out the welding operation. During welding, pay attention to the clamping status of the device to prevent pipe displacement.

Images