Large-diameter thick-wall steel pipe butt welding method and accurate positioning device thereof

Abstract

The application discloses a large-diameter thick-wall steel pipe butt welding method and a precise positioning device thereof, relates to the technical field of steel pipe welding, and solves the technical problems that the existing positioning device is difficult to guarantee positioning precision, is prone to uneven gap between bevels, and an existing external butt joint device adopts a single-point or multi-point concentrated clamping mode, and is prone to oval deformation, and the application comprises a steel pipe body, two support mechanisms are arranged at the bottom of the two steel pipe bodies, an external butt joint positioning mechanism is arranged on the outer wall of the adjacent positions of the two steel pipe bodies, and an internal support mechanism is arranged on the inner wall of the adjacent positions of the two steel pipe bodies. The application cooperates the support mechanism, the internal support mechanism and the external butt joint positioning mechanism to construct a full-range positioning system of 'external locking and internal supporting', and effectively solves the technical problems of low butt welding precision of the existing large-diameter thick-wall steel pipe, easy deformation of a pipe opening, low construction efficiency and poor safety.

Description

Technical Field

[0001] This invention relates to the field of steel pipe welding technology, specifically to a method for butt welding large-diameter thick-walled steel pipes and a precise positioning device thereof. Background Technology

[0002] Large-diameter, thick-walled steel pipes are core components of major projects such as long-distance petrochemical pipelines, main steam pipelines for power plant boilers, and municipal high-pressure water supply and drainage networks. The quality of their on-site butt welding directly determines the service life and safety reliability of the pipeline system. With the expansion of project scale and the increase in pipeline pressure levels, more stringent requirements are placed on the coaxiality of the steel pipe joints, the accuracy of bevel alignment, and the stability of the welding process.

[0003] Currently, the traditional operation method of on-site butt welding of large-diameter thick-walled steel pipes is generally adopted, which involves cranes and manual adjustments. Some projects use simple external butt welding devices for positioning assistance. However, the existing technology still has some insurmountable technical defects, making it difficult to guarantee positioning accuracy and easily causing uneven bevel gaps. Furthermore, the existing external butt welding devices use single-point or multi-point centralized clamping methods, and when external clamping force is applied to the pipe end, even thick-walled steel pipes are prone to elliptical deformation.

[0004] The aforementioned technical problems have become a bottleneck restricting the quality and efficiency of welding construction of large-diameter thick-walled steel pipes. Therefore, it is urgent to develop a new type of butt welding positioning device that can achieve precise positioning, prevent pipe end deformation, and has high efficiency, safety and wide applicability. Summary of the Invention

[0005] The purpose of this invention is to provide a method for butt welding large-diameter thick-walled steel pipes and a precise positioning device thereof, in order to solve the following technical problems:

[0006] It is difficult to guarantee positioning accuracy, and uneven bevel gaps are prone to occur. Furthermore, existing external clamping devices use single-point or multi-point centralized clamping methods. When external clamping force is applied to the pipe end, even thick-walled steel pipes are prone to elliptical deformation.

[0007] The objective of this invention can be achieved through the following technical solution: a precision positioning device for butt welding of large-diameter thick-walled steel pipes, comprising a steel pipe body, two support mechanisms provided at the bottom of each of the two sections of the steel pipe body, a butt positioning mechanism provided on the outer wall of the adjacent section of the two sections of the steel pipe body, and an inner support mechanism provided on the inner wall of the adjacent section of the two sections of the steel pipe body;

[0008] The positioning mechanism includes a base plate, with grooved seats symmetrically fixed to the left and right sides of the top of the base plate. A hydraulic jack is fixed to the center of the top of the base plate, and a lower support plate is fixed to the top of the hydraulic jack. Two supports are symmetrically fixed to the rear end of the top of the base plate. A diagonal rod is rotatably connected to the inner side of the top of each support by a bolt. A nut is threaded to the left side of the outer wall of each bolt. A top support block is fixed to the front end of the top of each diagonal rod. A threaded sleeve is fixed to the inner side of the front end of each top support block. A lead screw is threaded to the inside of each threaded sleeve. A pressure plate is rotatably connected to the bottom of each lead screw. A groove block is fixed to the top of the center of the front surface of the two grooved seats and the center of the front surface of the two pressure plates. A tensioning component is provided inside the two sets of groove blocks. The bottom ends of the outer walls of the two adjacent sections of the steel pipe body are respectively snapped onto the left and right sides of the top of the lower support plate. The two pressure plates are respectively fastened to the top ends of the outer walls of the two sections of the steel pipe body.

[0009] As a further embodiment of the present invention, a rocker arm is provided at the top of each of the two lead screws, and a reinforcing rib is machined at the front end of the top of each of the two snap-fit ​​plates.

[0010] As a further embodiment of the present invention, the tensioning component includes a sleeve, with a first collar rotatably connected to the outer sides of the top and bottom of the sleeve, and a second threaded sleeve fixedly connected to the outer sides of the two first collars. A lever is fixedly connected to the outer wall of each second threaded sleeve, and a tensioning rod is threadedly connected to the inner side of each second threaded sleeve. The two tensioning rods are respectively inserted into the interior of two slots located on the same central axis.

[0011] As a further embodiment of the present invention, the sleeve is provided with two symmetrical sliding grooves inside, and the ends of the two tensioning rods with threaded grooves are symmetrically provided with sliders, which are slidably connected inside the sliding grooves.

[0012] As a further embodiment of the present invention, the support mechanism includes a base, with hydraulic struts fixedly connected to the four corners of the bottom of the base, and a caster wheel fixedly connected to the bottom of each hydraulic strut. Multiple support frames are symmetrically fixedly connected to the top of the base, and ramp plates are symmetrically fixedly connected to the top of the multiple support frames. Multiple hydraulic push rods are symmetrically fixedly connected to the top of the interior of the base, and a support groove is fixedly connected to the top of each hydraulic push rod. A ball head is rotatably connected to the top of each support groove. Two ramp plates are attached to the bottom of the outer wall of the steel pipe body.

[0013] As a further aspect of the present invention, each of the ramp plates has two through holes inside, and multiple support grooves can extend through the through holes from the bottom of the ramp plate.

[0014] As a further embodiment of the present invention, a laser emitter and a laser receiver are respectively provided on the left and right sides of the back of the base.

[0015] As a further embodiment of the present invention, the internal support mechanism includes a threaded rod, a support head rotatably connected to the right side of the threaded rod, a handwheel fixedly connected to the left side of the outer wall of the threaded rod, a support sleeve I threadedly connected to the right side of the middle section of the outer wall of the threaded rod, a collar II rotatably connected to the left side of the support sleeve I, an external threaded sleeve fixedly connected to the left side of the collar II, a handle fixedly connected to the left side of the outer wall of the external threaded sleeve, and a support sleeve II threadedly connected to the left side of the middle section of the outer wall of the external threaded sleeve. Multiple shearing rods are rotatably connected in a circular array at equal intervals to the outer walls of the support head, the right side of the outer wall of the support sleeve I, the left side of the outer wall of the support sleeve I, and the outer walls of the support sleeve II. A cross brace is rotatably connected to the outer side of each shearing rod. The external threaded sleeve is slidably connected to the outer wall of the threaded rod, and the outer sides of the multiple cross braces are all attached to the inner wall of the steel pipe body.

[0016] This invention also discloses a method for butt welding of large-diameter thick-walled steel pipes, comprising the following steps:

[0017] Step 1, Pipe Installation: Hoist the two sections of steel pipe to be welded onto the top of the two sets of support mechanisms, so that the bottom of the outer wall of the steel pipe is in contact with the two inclined plates on the support frame. The inclined plates form lateral limiting and foundation support. Move the two sets of support mechanisms to the welding operation area. Adjust the height of the four hydraulic struts to complete the horizontal calibration of the two steel pipe sections and align them with the foundation height, ensuring that the two steel pipe sections are on the same horizontal plane.

[0018] Step 2, Pre-alignment adjustment: Activate the hydraulic jacking rod one inside the base, push the support groove to drive the ball head to extend upward from the through hole of the slope plate, push the main body of the steel pipe away from the slope plate, and adjust the axial position and circumferential angle of the steel pipe by means of the universal rotation characteristic of the ball head. After completing the pre-alignment adjustment of the two sections of steel pipe, lower the hydraulic jacking rod one back down so that the main body of the steel pipe falls back onto the slope plate to complete the foundation positioning.

[0019] Step 3, Internal Support Alignment: Place the entire internal support mechanism into the inner wall of the right steel pipe body. Turn the handwheel to rotate the threaded rod, driving the support sleeve one to slide to the right, pushing the right shear rod outward, and causing the cross brace to open and fit against the inner wall of the right steel pipe, thus completing the fixation of the internal support mechanism inside the right steel pipe. Move the left support mechanism to move the left steel pipe closer to the right, so that the left steel pipe opening fits onto the left outer wall of the internal support mechanism. After completing the initial coaxial connection, turn the handle to rotate the external threaded sleeve, driving the support sleeve two to slide axially, pushing the left shear rod outward, and causing the left cross brace to open and fit against the inner wall of the left steel pipe. The two sets of cross braces on the left and right sides respectively form rigid support for the inner walls of the two steel pipe openings, ensuring the coaxiality of the two steel pipes and preventing the pipe openings from being deformed by pressure.

[0020] Step 4, External Locking: Place the alignment positioning mechanism directly below the joint of the two steel pipe sections. Activate the hydraulic jack to push the lower support plate upwards, ensuring the top of the lower support plate fits against the bottom of the outer wall of the two steel pipe sections, providing bottom support. Adjust the support angle of the diagonal rod according to the outer diameter of the steel pipe. After adjustment, tighten the nut to lock the diagonal rod. Rotate the rocker arm to drive the screw rod to rotate, pushing the pressure plate downwards to fit against the top of the outer wall of the steel pipe, completing the initial upper and lower clamping at the joint. Insert the two tension rods of the tensioning component into the corresponding upper and lower slots. Rotate the threaded sleeves at both ends to retract the tension rods, tightening the upper and lower slots, causing the pressure plate to further press down on the steel pipe, locking the joint of the two steel pipe sections into a whole, completing the external positioning and locking.

[0021] Step 5, Welding Operation: After completing the internal and external positioning, the joint of the two steel pipes can be welded. After welding, loosen the tensioning components, lower the pressure plate, retract the cross brace of the internal support mechanism, and remove the internal support mechanism and the joint positioning mechanism to complete the joint welding operation of the large-diameter thick-walled steel pipe.

[0022] The beneficial effects of this invention are:

[0023] (1) The present invention constructs an all-round positioning system of “external locking and internal support” through the coordinated cooperation of the support mechanism, the internal support mechanism and the positioning mechanism, which effectively solves the technical problems of low welding accuracy of large-diameter thick-walled steel pipes, easy deformation of pipe ends, low construction efficiency and poor safety.

[0024] (2) The present invention adopts a multi-level positioning process of laser horizontal calibration, multi-dimensional pre-alignment of universal ball head, coaxial internal support guidance and rigid external locking, which significantly improves the coaxiality, horizontality and bevel alignment accuracy of the two steel pipes, and completely restricts the radial displacement and circumferential rotation of the steel pipe; the horizontal support rods distributed in a ring array provide uniform internal support, which offsets the external clamping force from the root and avoids the pipe opening from elliptical deformation.

[0025] (3) The present invention integrates the functions of steel pipe transfer, height adjustment and positioning and locking, eliminating the need for long-term suspension operation by crane, making operation simple and efficient, with no displacement during the welding process, greatly shortening the construction cycle and eliminating safety hazards such as falling objects from heights and steel pipe tilting; the device can be adjusted to adapt to various pipe diameters and erection conditions, ensuring stable and reliable welding quality and effectively reducing the later operation and maintenance costs. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the connection structure of the precision positioning device for butt welding of large-diameter thick-walled steel pipes according to the present invention;

[0027] Figure 2 This is the present invention. Figure 1 A partial sectional view of the connection structure;

[0028] Figure 3 This is the present invention. Figure 1 Schematic diagram of the connection structure of the center-alignment positioning mechanism;

[0029] Figure 4 This is the present invention. Figure 3 A front view diagram of the connection structure;

[0030] Figure 5 This is the present invention. Figure 3 A partial sectional view of the connection structure of the tension member;

[0031] Figure 6 This is the present invention. Figure 5 Enlarged connection structure diagram at point A;

[0032] Figure 7 This is the present invention. Figure 2 Schematic diagram of the connection structure of the inner support mechanism;

[0033] Figure 8 This is the present invention. Figure 7 Schematic diagram of the connection structure of the middle support sleeve 1, support sleeve 2, shear rod and cross brace;

[0034] Figure 9 This is the conclusion of the present invention. Figure 7 A partial cross-sectional view of the connection structure of the inner support mechanism, excluding the shear bar and cross brace;

[0035] Figure 10 This is the present invention. Figure 9 Enlarged connection structure diagram at point B;

[0036] Figure 11 This is the present invention. Figure 1 Schematic diagram of the connection structure of the central support mechanism;

[0037] Figure 12 This is the present invention. Figure 11 A front view diagram of the connection structure.

[0038] In the diagram: 1. Steel pipe body; 2. Support mechanism; 201. Base; 202. Hydraulic strut; 203. Casters; 204. Support frame; 205. Inclined plate; 206. Hydraulic jacking rod one; 207. Support groove; 208. Ball head; 3. Alignment and positioning mechanism; 301. Base plate; 302. Groove seat; 303. Hydraulic jacking rod two; 304. Lower support plate; 305. Bracket; 306. Diagonal bar; 307. Bolt; 308. Nut; 309. Top support block; 310. Thread. 311. Screw; 312. Press plate; 313. Groove block; 314. Tensioning component; 3141. Sleeve; 3142. Shaft collar one; 3143. Threaded sleeve two; 3144. Lever; 3145. Tensioning rod; 4. Internal support mechanism; 401. Threaded rod; 402. Support head; 403. Handwheel; 404. Support sleeve one; 405. Shaft collar two; 406. External threaded sleeve; 407. Handle; 408. Support sleeve two; 409. Shearing rod; 410. Cross brace. Detailed Implementation

[0039] 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.

[0040] Example 1

[0041] Please see Figure 1 , Figure 2 , Figure 11 and Figure 12 As shown, the present invention is a precision positioning device for butt welding of large-diameter thick-walled steel pipes, including a steel pipe body 1. Two support mechanisms 2 are provided at the bottom of each of the two steel pipe body 1 sections. The support mechanisms 2 are used to support the bottom of the steel pipe body 1, so that the steel pipe body 1 can be moved easily. A butt positioning mechanism 3 is provided on the outer wall of the adjacent section of the two steel pipe body 1 sections. The butt positioning mechanism 3 is used to precisely position the two large-diameter thick-walled steel pipe body 1 sections to be welded together. An inner support mechanism 4 is provided on the inner wall of the adjacent section of the two steel pipe body 1 sections. The inner support mechanism 4 is used to support the inside of the steel pipe body 1, thereby assisting the butt positioning mechanism 3 in positioning the steel pipe body 1.

[0042] The support mechanism 2 includes a base 201, which is used to fix the hydraulic struts 202 and support frames 204. Hydraulic struts 202 are fixedly connected to the four corners of the bottom of the base 201, and the hydraulic struts 202 are used to adjust the support height of the base 201. A caster wheel 203 is fixedly connected to the bottom of each hydraulic strut 202, and the caster wheel 203 is used to move the base 201. Multiple support frames 204 are symmetrically fixedly connected to the top of the base 201, and the support frames 204 are used to fix and support the ramp plate 205. The ramp plate 205 is symmetrically fixedly connected to the top of the multiple support frames 204, and the ramp plate 205 is used to clamp and support the steel pipe body 1. The inner top of the base 201... Multiple hydraulic jacks 206 are symmetrically fixed at the ends. The hydraulic jacks 206 are used to drive the support grooves 207 to rise and fall. The top of each hydraulic jack 206 is fixed to the support groove 207. The support groove 207 is used to support the ball head 208, so that the ball head 208 can rotate inside the support groove 207. The top of each support groove 207 is rotatably connected to the ball head 208. The ball head 208 is used to support the bottom of the outer wall of the steel pipe body 1. The steel pipe body 1 is supported by the ball head 208, which allows the steel pipe body 1 to slide at its top or to rotate around its own central axis. Two inclined plates 205 are attached to the bottom of the outer wall of the steel pipe body 1.

[0043] In this embodiment, preferably, each ramp plate 205 has two through holes inside, and multiple support grooves 207 can pass through the bottom of the ramp plate 205 from the through holes, thereby supporting the bottom of the outer wall of the steel pipe body 1, so that the steel pipe body 1 can slide left and right at its top, or allow the steel pipe body 1 to rotate around its own central axis.

[0044] In this embodiment, preferably, a laser emitter and a laser receiver are respectively provided on the left and right sides of the back of the base 201. The laser emitter and laser receiver can be used to level the two adjacent support mechanisms 2, so that the steel pipe body 1 that is clamped to its top is in a horizontal state, which facilitates the butt welding of the steel pipe body 1.

[0045] In summary, when butt welding of the steel pipe body 1 is required, the two sections of the steel pipe body 1 to be welded together are first hoisted to the top of the support mechanism 2. The casters 203 at the bottom of the four hydraulic struts 202 at the bottom of the base 201 allow the entire support mechanism 2 to move freely, thus transporting the supported steel pipe body 1 to the designated welding position. Subsequently, the overall support height of the base 201 is adjusted by the extension and retraction of the hydraulic struts 202 to adapt to different erection requirements and unify the foundation erection height of the two sections of the steel pipe body 1. The support frame 204 at the top of the base 201 fixes the ramp plate 205. The two ramp plates 205 are attached to the bottom of the outer wall of the steel pipe body 1, thus providing lateral restraint and foundation support for the steel pipe body 1, preventing lateral slippage during welding. When fine-tuning of the position and angle of the steel pipe body 1 is required, the base is activated. The hydraulic jack 206 inside the base 201 pushes the support groove 207, along with the ball head 208, to extend upwards from the through hole in the ramp plate 205, pushing the steel pipe body 1 away from the ramp plate 205. With the help of the rotatable ball head 208, the steel pipe body 1 can be driven to slide left and right along the axis to complete axial alignment, and it can also drive the steel pipe body 1 to rotate around its own central axis to complete the circumferential angle adjustment. At the same time, the laser emitter and laser receiver set on the back of the base 201 work together to level the support mechanisms 2 at the two docking positions, ensuring that the two sections of the steel pipe body 1 remain in the same horizontal state. After the position, angle, and level of the steel pipe are all adjusted in place, the hydraulic jack 206 is lowered back, so that the steel pipe falls back onto the ramp plate 205. The ramp plate 205 provides stable support during the welding process, ensuring that the steel pipe body 1 will not shift during the welding operation.

[0046] Example 2

[0047] Please see Figures 1-6As shown, based on Embodiment 1, the butt-joint positioning mechanism 3 includes a base plate 301. The base plate 301 is used to fix and support the groove seat 302 and the hydraulic jack 303. The groove seat 302 is symmetrically fixed to the left and right sides of the top of the base plate 301. The groove seat 302 is used to support the left and right sides of the bottom of the lower support plate 304. The hydraulic jack 303 is fixed to the center of the top of the base plate 301. The hydraulic jack 303 is used to adjust the support height of the lower support plate 304 so that it can fit against the bottom of the outer wall of the steel pipe body 1, thereby fixing the two sections of the steel pipe body 1 to be butt-jointed. The lower support plate 304 is fixed to the top of the hydraulic jack 303. The lower support plate 304 is used to support the bottom of the outer wall of the steel pipe body 1. Two brackets 305 are symmetrically fixed to the top rear end of the bottom plate 301. The brackets 305 are used to support the diagonal rods 306. The diagonal rods 306 are rotatably connected to the inner side of the top of each bracket 305 by bolts 307. The diagonal rods 306 are used to fix and support the top support block 309. A nut 308 is threaded to the left side of the outer wall of each bolt 307. Through the cooperation of the bolts 307 and the nuts 308, the diagonal rods 306 rotatably connected to the inner side of the top of the bracket 305 can be clamped and fixed. When it is necessary to adjust the support angle of the diagonal rods 306, the nuts 308 are loosened so that the diagonal rods 306 can be supported. After rotating the inner top of the bracket 305 to adjust the support angle, tighten the nut 308 again. A top support block 309 is fixed to the front end of each diagonal rod 306. The top support block 309 is used to fix the threaded sleeve 310. A threaded sleeve 310 is fixed to the inner front end of each top support block 309. The threaded sleeve 310 is used to support the lead screw 311. A lead screw 311 is threadedly connected inside each threaded sleeve 310. The lead screw 311 is used to drive the pressure plate 312 to rise and fall. A pressure plate 312 is rotatably connected to the bottom of each lead screw 311. The pressure plate 312 is used to press the top of the outer wall of the steel pipe body 1 to prevent further damage to the steel pipe body 1. During butt welding, the main body of the steel pipe 1 shakes or shifts, improving the stability during welding. The top of the center of the front surface of the two groove seats 302 and the center of the front surface of the two pressure plates 312 are fixed with groove blocks 313. The groove blocks 313 are used to snap the tensioning members 314. Through the cooperation of the groove blocks 313 and the tensioning members 314, the pressure plates 312 and the top of the outer wall of the main body of the steel pipe 1 can be tightly snapped together. The tensioning members 314 are provided inside the two sets of groove blocks 313. The bottom of the outer wall of the two adjacent sections of the main body of the steel pipe 1 is respectively snapped to the top left and right sides of the top of the lower support plate 304. The two pressure plates 312 are respectively snapped to the top of the outer wall of the two sections of the main body of the steel pipe 1.

[0048] In this embodiment, preferably, each of the two lead screws 311 is provided with a rocker arm at its top end, the rocker arm being used to drive the lead screws 311 to rotate, and each of the two snap fasteners 312 is provided with a reinforcing rib at its top front end to enhance the support strength of the snap fasteners 312.

[0049] In this embodiment, preferably, the tensioning member 314 includes a sleeve 3141, which is used to sleeve two tensioning rods 3145, allowing the tensioning rods 3145 to slide inside the sleeve 3141. A first collar 3142 is rotatably connected to the outer sides of the top and bottom of the sleeve 3141. The first collar 3142 supports a second threaded sleeve 3143, allowing the second threaded sleeve 3143 to rotate about the central axis of the collar. A second threaded sleeve 3143 is fixedly connected to the outer sides of both first collars 3142, and the second threaded sleeve 3143 is used to drive the tensioning rods 3145 to move. Each second threaded sleeve 3143... Each outer wall is fixed with a lever 3144. By turning the lever 3144, the threaded sleeve 3143 can be rotated. Each threaded sleeve 3143 has a tension rod 3145 threadedly connected to its inner side. The tension rod 3145 can be inserted into the inside of the slot block 313. By rotating the threaded sleeve 3143, the tension rod 3145 can be retracted into the inside of the sleeve 3141. Thus, by pulling the two slot blocks 313 together, the pressure plate 312 is tightened, so that it can be tightly pressed against the top of the outer wall of the steel pipe body 1. The two tension rods 3145 are respectively inserted into the inside of the two slot blocks 313 located on the same central axis.

[0050] In this embodiment, preferably, two symmetrical sliding grooves are provided inside the sleeve 3141, and sliders are symmetrically machined at the ends of the two tension rods 3145 with threaded grooves. The sliders are slidably connected inside the sliding grooves. Through the mutual cooperation of the sliding grooves and sliders, the movement trajectory and movement stroke of the tension rods 3145 can be limited, so that the tension rods 3145 can maintain vertical movement inside the sleeve 3141.

[0051] In summary, after the support mechanism 2 completes the alignment of the two steel pipe bodies 1, the alignment positioning mechanism 3 is first placed directly below the adjacent joint of the two steel pipe bodies 1. The hydraulic jack 2 303 at the top center of the base plate 301 is activated, pushing the lower support plate 304 to move vertically upward until the top left and right sides of the lower support plate 304 are tightly attached to the bottom of the outer wall of the two steel pipe bodies 1, providing a stable bottom foundation support for the alignment. Then, according to the actual outer diameter of the steel pipe to be welded, the nut 308 on the outside of the bolt 307 at the top of the bracket 305 is loosened, allowing the diagonal rod 306 to rotate freely around the central axis of the bolt 307, driving the top support block 309 at the front end of the diagonal rod 306 and the threaded sleeve 310 to adjust the angle synchronously. Adjust the angle until the central axis of the threaded sleeve 310 is basically aligned with the normal direction of the corresponding position on the outer wall of the steel pipe. After adjustment, retighten the nut 308 to rigidly lock the diagonal rod 306 and the bracket 305, thus completing the angle adaptation for steel pipes of different diameters. This ensures that the clamping force of the subsequent pressing plate 312 acts perpendicularly on the outer wall of the steel pipe body 1, avoiding lateral force that could cause displacement of the steel pipe body 1. Next, rotate the rocker at the top of the screw 311 to drive the screw 311 to rotate and feed downward within the threaded sleeve 310, causing the pressing plate 312, which is rotated and connected to the bottom of the screw 311, to descend synchronously until the lower surface of the pressing plate 312 is tightly fitted to the top of the outer wall of the steel pipe body 1, thereby completing the clamping of the steel pipe body 1. The main body 1 is initially clamped at the joint. The reinforcing ribs processed on the top of the snap-fit ​​plate 312 can effectively improve its bending strength and prevent the front end of the snap-fit ​​plate 312 from deforming or breaking due to excessive tension when the tensioning member 314 tightens the slot block 313. Then, the two tensioning rods 3145 of the tensioning member 314 are respectively inserted into the slot block 313 that are corresponding to each other and located on the same central axis. Then, the threaded sleeves 3143 at both ends of the sleeve 3141 are rotated. Due to the rotational connection of the first collar 3142, the threaded sleeves 3143 can rotate freely around the central axis of the sleeve 3141 without driving the sleeve 3141 to rotate. At the same time, the sliding groove inside the sleeve 3141 and the slider at the end of the tensioning rod 3145 are connected. A sliding guide pair is formed, restricting the tension rod 3145 to only move linearly along the central axis of the sleeve 3141 and preventing it from rotating with the threaded sleeve 3143. Therefore, when the threaded sleeve 3143 is rotated, the upper and lower tension rods 3145 will simultaneously retract into the sleeve 3141, pulling the upper and lower groove blocks 313 towards the middle, thereby driving the pressure plate 312 to further press down on the steel pipe body 1, firmly locking the joint of the two sections of the steel pipe body 1 into a whole, completely restricting the radial displacement and circumferential rotation of the steel pipe. With the stable support of the support mechanism 2, the alignment accuracy of the two sections of the steel pipe remains unchanged throughout the welding operation, significantly improving the welding quality and construction efficiency of large-diameter thick-walled steel pipes.

[0052] Example 3

[0053] Please see Figure 1 , Figure 2 and Figures 7-10 As shown, based on Embodiment 1 and Embodiment 2, the inner support mechanism 4 includes a threaded rod 401, which drives the support sleeve 404 to move. A support head 402 is rotatably connected to the right side of the threaded rod 401, which supports the bottom right side of the multiple shearing rods 409 located on the right side. A handwheel 403 is fixedly connected to the left side of the outer wall of the threaded rod 401, which drives the threaded rod 401 to rotate. A threaded connection is located at the right side of the middle section of the outer wall of the threaded rod 401. A support sleeve 404 is attached, which can slide left and right on the outer wall of the threaded rod 401 and support the bottom left side of the multiple shearing rods 409 located on the right and the bottom right side of the multiple shearing rods 409 located on the left. A collar 405 is rotatably connected to the left side of the support sleeve 404. The collar 405 is used to support the external threaded sleeve 406, connecting the external threaded sleeve 406 to the support sleeve 404, and also allowing the external threaded sleeve 406 to move on the outer side of the threaded rod 401. The wall rotates, and an external threaded sleeve 406 is fixedly connected to the left side of the second collar 405. The external threaded sleeve 406 is used to drive the second support sleeve 408 to move. A handle 407 is fixedly connected to the left side of the outer wall of the external threaded sleeve 406. The handle 407 is used to drive the external threaded sleeve 406 to rotate. The second support sleeve 408 is threadedly connected to the middle section of the outer wall of the external threaded sleeve 406 near the left side. The second support sleeve 408 is used to support the left side of the bottom end of the first shearing rod 409 located on the left side. The outer wall of the support head 402 and the support... Multiple shearing rods 409 are equidistantly connected in a ring array on the right side of the outer wall of sleeve 404, the left side of the outer wall of support sleeve 404, and the outer wall of support sleeve 408. The shearing rods 409 are used to support the cross braces 410. Each shearing rod 409 is rotatably connected to a cross brace 410 on its outer side. The cross brace 410 is used to support the inner wall of the steel pipe body 1. The external threaded sleeve 406 is slidably connected to the outer wall of the threaded rod 401. The outer sides of the multiple cross braces 410 are all attached to the inner wall of the steel pipe body 1.

[0054] In summary, through the coordinated operation of the inner support mechanism 4, before positioning the two sections of the steel pipe body 1, the inner support mechanism 4 is first placed on the inner wall of the steel pipe body 1 located on the right side. Then, the handwheel 403 is rotated, which drives the threaded rod 401 to rotate, thereby causing the support sleeve 404 to slide to the right. Through the cooperation of the support sleeve 404 and the multiple shearing rods 409 located on the right side, the multiple cross braces 410 rotatably connected to the outside of the shearing rods 409 can support the inner wall of the steel pipe body 1. Afterwards, the steel pipe body 1 located on the left side is moved to the left side of the steel pipe body 1 located on the right side through the support mechanism 2. Then, the steel pipe body 1 located on the left side is sleeved onto the left side of the outer wall of the inner support mechanism 4. Then, the handle 407 is turned, and the external threaded sleeve 406 is rotated by the handle 407, which can drive the support sleeve 408 to slide, thereby supporting the multiple shearing rods 409 located on the left side, and then supporting the multiple cross braces 410 located on the left side against the inner wall of the steel pipe body 1. This allows the two steel pipe bodies 1 to be joined together and supports the inner walls of the two sections of the steel pipe bodies 1, preventing deformation at the pipe opening when the pressure plate 312 presses the pipe opening during the subsequent alignment and positioning of the steel pipe bodies 1.

[0055] Example 4

[0056] Please see Figures 1-12 As shown, this embodiment combines Embodiment 1, Embodiment 2, and Embodiment 3. Through the cooperation of the support mechanism 2, the inner support mechanism 4, and the butt joint positioning mechanism 3, the operational problem of accurately butt joint positioning of large-diameter thick-walled steel pipes during butt joint welding can be solved. First, the two sections of the steel pipe body 1 to be welded are respectively hoisted to the top of the two sets of support mechanisms 2. The two inclined plates 205 fixed to the top support frame 204 of the base 201 naturally fit against the bottom of the outer wall of the steel pipe to form lateral limiting and basic support. Relying on the universal wheels 203 at the bottom of the four corner hydraulic struts 202 at the bottom of the base 201, the entire set of support mechanisms 2 and the supported steel pipe are moved freely to the designated welding position. The base is adjusted by the extension and retraction of the hydraulic struts 202. The overall support height of 201 is to unify the foundation height of the two steel pipe sections. At the same time, the laser emitter and laser receiver on the back of the base 201 are used to complete the horizontal calibration of the two sets of support mechanisms 2, ensuring that the two steel pipe sections are on the same horizontal plane. The hydraulic jack 206 inside the base 201 is activated to push the support groove 207 and the ball head 208 to extend upward from the through hole of the slope plate 205, pushing the steel pipe away from the slope plate 205. With the help of the universal rotation characteristics of the ball head 208, the steel pipe is driven to slide left and right along the axis to complete the axial alignment and rotate around its own central axis to adjust the circumferential angle of the weld. After the position, angle and level of the steel pipe are all adjusted in place, the hydraulic jack 206 is lowered back, so that the steel pipe falls back onto the slope plate 205 to achieve stable foundation support.

[0057] Based on this, first, place the entire inner support mechanism 4 into the inner wall of the pipe opening of the right steel pipe body 1. Rotate the handwheel 403 at the left end of the threaded rod 401 to drive the threaded rod 401 to rotate, driving the support sleeve 404 threadedly connected to the threaded rod 401 to slide to the right, pushing the right shear rod 409 to unfold outward and driving the corresponding cross bracing rod 410 to open synchronously until all the right cross bracing rods 410 are tightly attached to the inner wall of the right steel pipe, thus firmly fixing the inner support mechanism 4. Then, move the left steel pipe body 1 towards the right steel pipe slowly through the support mechanism 2, so that the pipe opening of the left steel pipe is accurately fitted onto the left side of the outer wall of the inner support mechanism 4 to achieve preliminary coaxial connection. Then, turn... The handle 407 on the outer wall of the external threaded sleeve 406 drives the external threaded sleeve 406 to rotate around the central axis of the threaded rod 401, driving the support sleeve 408 connected to its outer wall to slide axially, pushing the left shear rod 409 to unfold outward and driving the corresponding cross bracing rod 410 to open synchronously until all the left cross bracing rods 410 are tightly attached to the inner wall of the left steel pipe. At this time, the left and right sets of cross bracing rods 410 of the inner support mechanism 4 form a uniform annular rigid support for the inner wall of the two sections of steel pipe, which not only ensures the coaxiality accuracy of the two sections of steel pipe, but also effectively offsets the subsequent external pressure, prevents the pipe opening from elliptical deformation due to pressure, and ensures the alignment accuracy of the welding bevel.

[0058] Finally, the entire alignment positioning mechanism 3 is placed directly below the adjacent joint of the two steel pipe sections. The hydraulic jack 2 303 at the top center of the base plate 301 is activated to push the lower support plate 304 vertically upwards until the left and right sides of the top of the lower support plate 304 are tightly fitted against the bottom of the outer walls of the two steel pipe sections, providing stable bottom support for the joint. According to the actual outer diameter of the steel pipe to be welded, the nuts 308 on the outside of the bolts 307 at the top of the bracket 305 are loosened. The diagonal rod 306 is rotated to drive the front support block 309 and the threaded sleeve 310 to adjust their angles synchronously until the threaded sleeve 310... After the centerline of the 10th section is basically aligned with the normal direction of the corresponding position on the outer wall of the steel pipe, tighten the nut 308 to rigidly lock the diagonal rod 306 and the bracket 305, ensuring that the clamping force of the subsequent clamping plate 312 acts perpendicularly on the outer wall of the steel pipe to avoid displacement caused by lateral force. Rotate the rocker at the top of the screw 311 to drive the screw 311 to rotate and feed downward within the threaded sleeve 310, driving the clamping plate 312 connected to the bottom end to descend synchronously to fit tightly against the top of the outer wall of the steel pipe, completing the initial clamping at the joint. The reinforcing ribs machined on the top of the clamping plate 312 can effectively... To enhance its bending strength and prevent deformation during subsequent tensioning, the two tensioning rods 3145 of the tensioning component 314 are inserted into the corresponding upper and lower slots 313 located on the same central axis. The threaded sleeves 3143 at both ends of the sleeve 3141 are rotated. Through the rotational connection of the collar 3142 and the guiding and limiting effect of the sliding groove inside the sleeve 3141 and the slider at the end of the tensioning rod 3145, the two tensioning rods 3145 are simultaneously contracted into the sleeve 3141, pulling the two slots 313 towards the center and driving the pressure plate. 312 further presses the steel pipe body 1 downwards, and through the bottom support of the lower support plate 304 and the top pressing of the buckle plate 312, combined with the reinforcement and locking of the tensioning member 314, the joint of the two steel pipe sections is firmly locked into a whole, completely restricting the radial displacement and circumferential rotation of the steel pipe. With the stable support of the support mechanism 2 and the internal support of the inner support mechanism 4, a full-range positioning system of "external locking and internal support" is formed, ensuring that the alignment accuracy of the two steel pipe sections remains unchanged throughout the welding operation, and significantly improving the welding quality and construction efficiency of large-diameter thick-walled steel pipes.

[0059] Example 5

[0060] Please see Figures 1-12 As shown, based on Embodiments 1 to 4, the present invention also discloses a method for butt welding of large-diameter thick-walled steel pipes, comprising the following steps:

[0061] Step 1, Pipe Installation: Hoist the two sections of steel pipe body 1 to be welded onto the top of the two sets of support mechanisms 2 respectively, so that the bottom of the outer wall of the steel pipe body 1 is in contact with the two inclined plates 205 on the support frame 204. The inclined plates 205 form lateral limiting and foundation support. Move the two sets of support mechanisms 2 to the welding operation area. Adjust the height of the four hydraulic struts 202 to complete the horizontal calibration of the two sections of steel pipe and the alignment of the foundation height, ensuring that the two sections of steel pipe are on the same horizontal plane.

[0062] Step 2, Pre-alignment adjustment: Activate the hydraulic jack 206 inside the base 201, push the support groove 207 to drive the ball head 208 to extend upward from the through hole of the ramp plate 205, and push the steel pipe body 1 away from the ramp plate 205. Through the universal rotation characteristics of the ball head 208, adjust the axial position and circumferential angle of the steel pipe. After completing the pre-alignment adjustment of the two sections of steel pipe, lower the hydraulic jack 206 so that the steel pipe body 1 falls back onto the ramp plate 205 to complete the basic positioning.

[0063] Step 3, Internal Support Alignment: Place the entire internal support mechanism 4 into the inner wall of the pipe opening of the right steel pipe body 1. Rotate the handwheel 403 to drive the threaded rod 401 to rotate, drive the support sleeve 1 404 to slide to the right, push the right shear rod 409 to unfold outward, and drive the cross brace 410 to open and fit against the inner wall of the right steel pipe, thus completing the fixation of the internal support mechanism 4 inside the right steel pipe. Move the left support mechanism 2 to drive the left steel pipe to move closer to the right, so that the pipe opening of the left steel pipe is fitted onto the left outer wall of the internal support mechanism 4. After completing the initial coaxial connection, turn the handle 407 to drive the external threaded sleeve 406 to rotate, drive the support sleeve 2 408 to slide axially, push the left shear rod 409 to unfold outward, and drive the left cross brace 410 to open and fit against the inner wall of the left steel pipe. The two sets of cross braces 410 on the left and right sides respectively form rigid support for the inner walls of the pipe openings of the two steel pipes, ensuring the coaxiality of the two steel pipes and preventing the pipe openings from being deformed by pressure.

[0064] Step 4, External Locking: Place the alignment positioning mechanism 3 directly below the joint of the two steel pipe sections. Activate the hydraulic jack 303 to push the lower support plate 304 upward, so that the top of the lower support plate 304 fits against the bottom of the outer wall of the two steel pipe sections to provide bottom support. Adjust the support angle of the diagonal rod 306 according to the outer diameter of the steel pipe. After adjustment, tighten the nut 308 to lock the diagonal rod 306. Rotate the rocker arm to drive the screw rod 311 to rotate, pushing the pressure plate 312 downward to fit against the top of the outer wall of the steel pipe, completing the initial upper and lower clamping at the joint. Insert the two tension rods 3145 of the tensioning component 314 into the corresponding upper and lower slots 313 respectively. Rotate the threaded sleeves 3143 at both ends to drive the tension rods 3145 to retract, tightening the upper and lower slots 313, so that the pressure plate 312 further presses the steel pipe downward, locking the joint of the two steel pipe sections into a whole, completing the external positioning and locking.

[0065] Step 5, Welding Operation: After completing the internal and external positioning, the joint of the two steel pipes can be welded. After welding, release the tensioning component 314, lower the pressure plate 312, retract the cross brace 410 of the inner support mechanism 4, and take out the inner support mechanism 4 and the joint positioning mechanism 3 to complete the joint welding operation of the large-diameter thick-walled steel pipe.

[0066] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the present invention should still fall within the scope of the present invention.

Claims

1. A precision positioning device for butt welding of large-diameter thick-walled steel pipes, comprising a steel pipe body, characterized in that, Two support mechanisms are provided at the bottom of each of the two steel pipe sections, and a matching positioning mechanism is provided on the outer wall of the adjacent part of the two steel pipe sections. An inner support mechanism is provided on the inner wall of the adjacent part of the two steel pipe sections. The positioning mechanism includes a base plate, with grooved seats symmetrically fixed to the left and right sides of the top of the base plate. A hydraulic jack is fixed to the center of the top of the base plate, and a lower support plate is fixed to the top of the hydraulic jack. Two supports are symmetrically fixed to the rear end of the top of the base plate. A diagonal rod is rotatably connected to the inner side of the top of each support by a bolt. A nut is threaded to the left side of the outer wall of each bolt. A top support block is fixed to the front end of the top of each diagonal rod. A threaded sleeve is fixed to the inner side of the front end of each top support block. A lead screw is threaded to the inside of each threaded sleeve. A pressure plate is rotatably connected to the bottom of each lead screw. A groove block is fixed to the top of the center of the front surface of the two grooved seats and the center of the front surface of the two pressure plates. A tensioning component is provided inside the two sets of groove blocks. The bottom ends of the outer walls of the two adjacent sections of the steel pipe body are respectively snapped onto the left and right sides of the top of the lower support plate. The two pressure plates are respectively fastened to the top ends of the outer walls of the two sections of the steel pipe body. The internal support mechanism includes a threaded rod, a support head rotatably connected to the right side of the threaded rod, a handwheel fixedly connected to the left side of the outer wall of the threaded rod, a support sleeve I threadedly connected to the right side of the middle section of the outer wall of the threaded rod, a collar II rotatably connected to the left side of the support sleeve I, an external threaded sleeve fixedly connected to the left side of the collar II, a handle fixedly connected to the left side of the outer wall of the external threaded sleeve, and a support sleeve II threadedly connected to the left side of the middle section of the outer wall of the external threaded sleeve. Multiple shearing rods are rotatably connected in a circular array on the outer wall of the support head, the right side of the outer wall of the support sleeve I, the left side of the outer wall of the support sleeve I, and the outer wall of the support sleeve II. Each shearing rod is rotatably connected to a cross brace on its outer side. The external threaded sleeve is slidably connected to the outer wall of the threaded rod, and the outer sides of the multiple cross braces are all attached to the inner wall of the steel pipe body. The tensioning component includes a sleeve, with a first collar rotatably connected to the outer sides of the top and bottom of the sleeve. A second threaded sleeve is fixedly connected to the outer sides of both first collars. A lever is fixedly connected to the outer wall of each second threaded sleeve. A tensioning rod is threadedly connected to the inner side of each second threaded sleeve. The two tensioning rods are respectively inserted into the interior of two slots located on the same central axis.

2. The precision positioning device for butt welding of large-diameter thick-walled steel pipes according to claim 1, characterized in that, Both lead screws are equipped with rocker arms at their top ends, and both snap-fit ​​plates are equipped with reinforcing ribs at their top front ends.

3. The precision positioning device for butt welding of large-diameter thick-walled steel pipes according to claim 1, characterized in that, The sleeve has two symmetrical sliding grooves inside, and the ends of the two tensioning rods with threaded grooves are symmetrically machined with sliders, which are slidably connected inside the sliding grooves.

4. The precision positioning device for butt welding of large-diameter thick-walled steel pipes according to claim 1, characterized in that, The support mechanism includes a base, with hydraulic struts fixedly connected to the four corners of the base's bottom. Each hydraulic strut has a caster wheel fixedly connected to its bottom. Multiple support frames are symmetrically fixedly connected to the top of the base, and ramps are symmetrically fixedly connected to the top of the multiple support frames. Multiple hydraulic jacks are symmetrically fixedly connected to the top of the base's interior, and a support groove is fixedly connected to the top of each hydraulic jack. A ball head is rotatably connected to the top of each support groove. Two ramps are attached to the bottom of the outer wall of the steel pipe body.

5. A precision positioning device for butt welding of large-diameter thick-walled steel pipes according to claim 4, characterized in that, Each of the ramp plates has two through holes inside, and multiple support grooves can extend from the bottom of the ramp plate through the through holes.

6. The precision positioning device for butt welding of large-diameter thick-walled steel pipes according to claim 4, characterized in that, A laser emitter and a laser receiver are respectively installed on the left and right sides of the back of the base.

7. A method for butt welding large-diameter thick-walled steel pipes, characterized in that, Using the precision positioning device for butt welding of large-diameter thick-walled steel pipes as described in claim 1, the welding method includes the following steps: Step 1, Pipe Installation: Hoist the two sections of steel pipe to be welded onto the top of the two sets of support mechanisms, so that the bottom of the outer wall of the steel pipe is in contact with the two inclined plates on the support frame. The inclined plates form lateral limiting and foundation support. Move the two sets of support mechanisms to the welding operation area. Adjust the height of the four hydraulic struts to complete the horizontal calibration of the two sections of steel pipe and align them with the foundation height, ensuring that the two sections of steel pipe are on the same horizontal plane. Step 2, Pre-alignment adjustment: Activate the hydraulic jacking rod 1 inside the base, push the support groove to drive the ball head to extend upward from the through hole of the slope plate, push the main body of the steel pipe away from the slope plate, and adjust the axial position and circumferential angle of the steel pipe by means of the universal rotation characteristic of the ball head. After completing the pre-alignment adjustment of the two sections of steel pipe, lower the hydraulic jacking rod 1 back down so that the main body of the steel pipe falls back onto the slope plate to complete the foundation positioning. Step 3, Internal Support Alignment: Place the entire internal support mechanism into the inner wall of the right steel pipe body. Turn the handwheel to rotate the threaded rod, drive the support sleeve one to slide to the right, push the right shear rod outward, and drive the cross brace to open and fit against the inner wall of the right steel pipe, thus completing the fixation of the internal support mechanism inside the right steel pipe. Move the left support mechanism to move the left steel pipe closer to the right, so that the left steel pipe opening fits onto the left outer wall of the internal support mechanism. After completing the initial coaxial connection, turn the handle to rotate the external threaded sleeve, drive the support sleeve two to slide along the axial direction, push the left shear rod outward, and drive the left cross brace to open and fit against the inner wall of the left steel pipe. The left and right sets of cross braces respectively form rigid support for the inner walls of the two steel pipe openings, ensuring the coaxiality of the two steel pipes and preventing the openings from being deformed by pressure. Step 4, External Locking: Place the alignment positioning mechanism directly below the joint of the two steel pipe sections. Activate the hydraulic jack to push the lower support plate upward, so that the top of the lower support plate fits against the bottom of the outer wall of the two steel pipe sections to provide bottom support. Adjust the support angle of the diagonal rod according to the outer diameter of the steel pipe. After adjustment, tighten the nut to lock the diagonal rod. Rotate the rocker arm to drive the screw rod to rotate, pushing the pressure plate downward to fit against the top of the outer wall of the steel pipe, completing the initial upper and lower clamping at the joint. Insert the two tension rods of the tensioning component into the corresponding upper and lower slots respectively. Rotate the threaded sleeves at both ends to drive the tension rods to retract, tightening the upper and lower slots, so that the pressure plate further presses the steel pipe downward, locking the joint of the two steel pipe sections into a whole, completing the external positioning and locking. Step 5, Welding Operation: After completing the internal and external positioning, the joint of the two steel pipes can be welded. After welding, loosen the tensioning components, lower the pressure plate, retract the cross brace of the internal support mechanism, and remove the internal support mechanism and the joint positioning mechanism to complete the joint welding operation of the large-diameter thick-walled steel pipe.

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