Pipeline welding equipment for water conservancy construction

Abstract

The invention provides pipeline welding equipment for water conservancy construction. The pipeline welding equipment comprises a base assembly and a butt joint mechanism with a connecting screw rod, and the base assembly comprises a fixed support, a welding support and a movable support; wherein the number of the fixed supports is two, the movable support is arranged on one side of the fixed supports, the welding support is arranged between the fixed supports and the movable support, and the butt joint mechanism is installed between the fixed supports and the movable support. According to the pipeline butt-joint device, pipelines needing to be welded are clamped and fixed through the pipe holding assembly, the pipelines of different specifications can be located on the same central axis after being clamped and fixed so as to meet the welding requirements of the pipelines of different specifications, then the movable support is driven by the butt-joint mechanism to move so as to conduct butt-joint on the clamped and fixed pipelines, and the butt-joint device can be used for butt-joint welding of the pipelines of different specifications. Welding treatment can be directly carried out subsequently; and the welding requirements of pipelines of different specifications can be met by adjusting the distance between the welding unit and the butt joint seam.

Description

TECHNICAL FIELD

[0001] The present application relates to a pipeline welding device, in particular to a pipeline welding device for water conservancy construction, and belongs to the technical field of pipeline welding. BACKGROUND

[0002] Pipeline welding is one of the most important and highly demanding construction links in water conservancy construction, mainly using welding to connect two separate pipe fittings into a firm and sealed whole to ensure the safety and stability of the entire water conveying system. The main welding methods include arc welding, argon arc welding, gas welding, etc. The existing water conservancy pipeline welding is mostly dependent on manual welding, especially for outdoor construction, which has the problems of low welding efficiency and unstable welding quality.

[0003] A Chinese patent with the patent name of "Pipeline annular automatic welding device and annular welding method" (patent number ZL202410689436.X) discloses a pipeline annular automatic welding technology. The welding equipment installed on the mounting seat can be moved and welded in a circular trajectory by a plurality of rollers driven by a power roller to provide power for annular movement around the outer wall of the large-diameter pipeline. However, the device can only be used on the pipeline with fixed welding equipment, and it does not have welding function itself, and it needs to be butt jointed with the pipeline, which makes it necessary to pre-weld the pipeline before annular automatic welding or to support and butt joint the pipeline during welding, which is not convenient to operate.

[0004] A Chinese patent with the patent name of "Oil and gas pipeline automatic welding equipment and welding process" (patent number ZL202410643206.X) discloses an oil and gas pipeline automatic welding technology. The device avoids the need to use an additional tool hammer to knock the guide belt to correct the guide belt, effectively improving the protection of the guide belt and the outer wall of the oil and gas pipeline. However, the device needs to be set on the pipeline for use, which makes it impossible to be directly removed after the pipeline welding is completed, and it also lacks a pipeline butt joint structure. Therefore, a pipeline welding device for water conservancy construction is proposed. SUMMARY

[0005] Therefore, the present application provides a pipeline welding device for water conservancy construction to solve or alleviate the technical problems in the prior art, and at least provides a beneficial choice.

[0006] The technical scheme of the embodiment of the present application is as follows: a pipeline welding device for water conservancy construction, comprising a base assembly and a butt joint mechanism with a connecting screw rod, the base assembly comprising a fixed support, a welding support and a movable support.

[0007] The two fixed supports are internally provided with pipe holding assemblies for clamping and fixing the pipes needing welding and making the pipes with different inner diameters on the same central axis; the welding support is internally provided with a pipe winding driving mechanism, one side of the pipe winding driving mechanism is provided with a welding driving mechanism and a welding unit;

[0008] The pipe winding driving mechanism is used for driving the welding driving mechanism and the welding unit to circularly move along the pipe butt joint seam and cooperating with the welding driving mechanism to finely adjust the distance between the welding unit and the butt joint seam, and the welding unit is used for welding work on the butt joint seam.

[0009] Further preferably, the butt joint mechanism further comprises a limiting frame, a first hydraulic cylinder and a traction pipe.

[0010] The first hydraulic cylinder is provided with a piston rod fixedly connected to one end of the traction pipe, and the connecting screw is four.

[0011] Further preferably, the pipe holding assembly comprises a reduction motor, a jacking frame, two pipe holding frames, two rollers, a driving screw, three pipe holding blocks and two connecting arm mechanisms.

[0012] The reduction motor is mounted on the inner side wall bottom of the fixed support or the movable support, the jacking frame is slidingly connected to the inner side wall bottom of the fixed support or the movable support, one end of the driving screw is fixedly connected to the output shaft of the reduction motor, the outer side wall of the driving screw is threadedly connected with the inner side wall of the jacking frame, the two pipe holding frames are symmetrically hinged to the inner side wall top of the fixed support or the movable support, the two rollers are respectively rotatably connected to one end of the two pipe holding frames, the outer side of the roller is slidingly connected with the outer side wall of the jacking frame, the two pipe holding blocks are respectively ball-hinged to the other end of the two pipe holding frames, the other pipe holding block is hinged to the top end of the jacking frame, and the two connecting arm mechanisms are mounted between the jacking frame and the two pipe holding frames.

[0013] Further preferably, the two connecting arm mechanisms each comprise a connecting frame, a driving sliding groove, a first sliding block and a second sliding block.

[0014] Wherein, one end of the connecting frame is hinged to the bottom of the inner side wall of the fixed support or the movable support, the driving slide groove is opened on one side of the connecting frame, one end of the first slider is fixedly connected to one side of the lifting frame, the outer side wall of the first slider is slidably connected to the inner side wall of the driving slide groove, one end of the second slider is fixedly connected to one side of the pipe clamping frame, and the outer side wall of the second slider is slidably connected to the inner side wall of the connecting frame.

[0015] More preferably, the tube winding drive mechanism includes a drive motor, a driving sprocket, a synchronous chain, two driven sprockets, two gears, and a C-shaped toothed ring;

[0016] The drive motor is mounted on one side of the welding support. The drive sprocket is fixedly connected to the output shaft of the drive motor. The two driven sprockets and gears are rotatably connected to the middle of the outer side walls of the two connecting screws. The two driven sprockets and gears are fixedly connected to each other. The synchronizing chain is meshed with the outer side walls of the two driven sprockets and the drive sprocket. The C-shaped toothed ring is slidably connected to the inner side wall of the welding support. The outer side wall of the C-shaped toothed ring is meshed with the outer side walls of the two gears.

[0017] More preferably, the welding drive mechanism includes a second hydraulic cylinder, a shelf, a third hydraulic cylinder, a traction block, and a mounting bracket;

[0018] The mounting bracket is detachably mounted on one end of the C-shaped toothed ring, the second hydraulic cylinder is mounted on one side of the second hydraulic cylinder, the shelf is fixedly connected to one end of the piston rod of the second hydraulic cylinder, the third hydraulic cylinder is mounted on one side of the shelf, the traction block is slidably connected to the inner side wall of the shelf, and one end of the piston rod of the third hydraulic cylinder is fixedly connected to one side of the traction block.

[0019] More preferably, the welding unit includes a welding frame, an arc welding module, a wire feeding module, and a tube bundle frame;

[0020] One end of the welding frame is fixedly connected to the bottom of the traction block, the outer side wall of the welding frame is slidably connected to the inner side wall of the shelf, the arc welding module is installed on the inner side wall of the welding frame, the wire feeding module is installed on one side of the welding frame, and the bundle tube frame is fixedly connected to one side of the mounting frame.

[0021] More preferably, the outer walls of the four connecting screws are each threaded with a number of nuts to fix the connecting screws to the two fixed supports and to limit the maximum stroke of the moving support.

[0022] More preferably, the tube clamping block is a comma-shaped cam or an arc-shaped block structure with teeth.

[0023] The embodiments of the present invention have the following advantages due to the adoption of the above technical solutions:

[0024] I. This invention uses a pipe clamping assembly to clamp and fix the pipes to be welded, and can ensure that pipes of different specifications are all located on the same central axis after being clamped and fixed, so as to meet the welding requirements of pipes of different specifications. Then, the moving support is driven by the docking mechanism to dock the clamped and fixed pipes so that welding can be performed directly thereafter.

[0025] Second, the present invention drives the welding drive mechanism and the welding unit to move in a ring along the pipe joint through the pipe winding drive mechanism, so as to use the welding unit to perform welding operations on the joint; the welding drive mechanism can also be used to adjust the distance between the welding unit and the joint, and the pipes after the joint are all located on the same central axis, so as to adapt to the welding requirements of pipes of different specifications by adjusting the distance between the welding unit and the joint.

[0026] Third, the top of the device of the present invention is open, allowing pipes to be inserted. The device can also be directly mounted on the pipe for clamping and fixing, eliminating the need for a sleeve installation method. After the welding operation is completed, the device can be directly removed from the pipe, improving operational efficiency.

[0027] The above overview is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of the invention will become readily apparent from the accompanying drawings and the following detailed description. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a structural diagram of the present invention;

[0030] Figure 2 This is a side view of the structure of the present invention;

[0031] Figure 3 This is a cross-sectional structural diagram of the present invention;

[0032] Figure 4 This is a cross-sectional structural schematic diagram of the movable support of the present invention;

[0033] Figure 5This is a cross-sectional view of the connecting screw of the present invention;

[0034] Figure 6 This is an axonometric view of the movable support of the present invention;

[0035] Figure 7 This is a cross-sectional view of the connecting frame of the present invention;

[0036] Figure 8 This is a bottom view of the welding support structure of the present invention;

[0037] Figure 9 This is an axonal view of the C-type toothed ring of the present invention.

[0038] Reference numerals: 1. Base assembly; 2. Docking mechanism; 3. Pipe-holding assembly; 4. Pipe-winding drive mechanism; 5. Welding drive mechanism; 6. Welding unit; 101. Fixed support; 102. Welding support; 103. Moving support; 201. Limiting frame; 202. First hydraulic cylinder; 203. Traction pipe; 204. Connecting screw; 301. Gear motor; 302. Lifting frame; 303. Pipe-holding frame; 304. Roller; 305. Drive screw; 306. Pipe-holding pressure block; 307. Connecting arm mechanism; 3 71. Connecting frame; 372. Drive slide rail; 373. First slider; 374. Second slider; 401. Drive motor; 402. Drive sprocket; 403. Synchronous chain; 404. Driven sprocket; 405. Gear; 406. C-shaped toothed ring; 501. Second hydraulic cylinder; 502. Shelf; 503. Third hydraulic cylinder; 504. Traction block; 505. Mounting frame; 601. Welding frame; 602. Arc welding module; 603. Wire feeding module; 604. Tube bundle frame; 71. Nut. Detailed Implementation

[0039] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0040] It is important to note that terms such as "first," "second," "symmetric," and "array" are used only to distinguish between descriptive and positional descriptions and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features specified with terms such as "first" or "symmetric" may explicitly or implicitly include one or more of that feature; similarly, when the quantity of certain features is not limited by words such as "two" or "three," it should be noted that such features also explicitly or implicitly include one or more features.

[0041] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0042] like Figures 1-9 As shown, this embodiment of the invention provides a pipeline welding device for water conservancy construction, including a base assembly 1 and a docking mechanism 2 with a connecting screw 204. The base assembly 1 includes a fixed support 101, a welding support 102 and a movable support 103.

[0043] The system includes two fixed supports 101, a movable support 103 located on one side of the fixed supports 101, a welding support 102 located between the fixed supports 101 and the movable support 103, a docking mechanism 2 installed between the fixed supports 101 and the movable support 103, and a connecting screw 204 connecting the fixed supports 101, the welding support 102, and the movable support 103. The docking mechanism 2 is used to drive the movable support 103 to reciprocate along the connecting screw 204. Both the fixed supports 101 and the movable support 103 are equipped with pipe clamping assemblies 3, which are used to clamp and fix the pipes to be welded and to ensure that pipes of different inner diameters are located on the same central axis. The welding support 102 is equipped with a pipe winding drive mechanism 4, and a welding drive mechanism 5 and a welding unit 6 are installed on one side of the pipe winding drive mechanism 4.

[0044] Among them, the pipe winding drive mechanism 4 is used to drive the welding drive mechanism 5 and the welding unit 6 to move in a ring along the pipe joint, and cooperates with the welding drive mechanism 5 to fine adjust the distance between the welding unit 6 and the joint. The welding unit 6 is used to perform welding operations on the joint.

[0045] like Figure 1 and Figure 2 As shown, in one embodiment, the docking mechanism 2 further includes a limiting frame 201, a first hydraulic cylinder 202, and a traction pipe 203;

[0046] The limiting frame 201 is symmetrically fixedly connected to both sides of the fixed support 101. There are two first hydraulic cylinders 202, which are respectively installed on the inner side wall of the limiting frame 201. The traction pipe 203 is symmetrically fixedly connected to both sides of the movable support 103. The piston rod of the first hydraulic cylinder 202 is fixedly connected to one end of the traction pipe 203. There are four connecting screws 204. Several nuts 71 are threadedly connected to the outer side wall of the four connecting screws 204, which are used to fix the connecting screws 204 to the two fixed supports 101 and limit the maximum stroke of the movable support 103.

[0047] The piston rod of the first hydraulic cylinder 202 drives the traction pipe 203 to move, and the moving traction pipe 203 drives the moving support 103 to move as a whole. The moving support 103 slides along the connecting screw 204 so as to connect the pipes clamped and fixed on the fixed support 101 and the moving support 103 respectively.

[0048] Whether the fixed support 101 or the movable support 103 needs to be moved during the docking process can be selected according to actual needs.

[0049] like Figure 1 , Figure 3 , Figure 6 and Figure 7 As shown, in one embodiment, each pipe-holding assembly 3 includes a geared motor 301, a lifting frame 302, two pipe-holding frames 303, two rollers 304, a drive screw 305, three pipe-holding pressure blocks 306, and two connecting arm mechanisms 307.

[0050] The geared motor 301 is mounted on the bottom of the inner wall of the fixed support 101 or the movable support 103. The lifting frame 302 is slidably connected to the bottom of the inner wall of the fixed support 101 or the movable support 103. One end of the drive screw 305 is fixedly connected to the output shaft of the geared motor 301. The outer wall of the drive screw 305 is threadedly connected to the inner wall of the lifting frame 302. Two pipe clamps 303 are symmetrically hinged to the top of the inner wall of the fixed support 101 or the movable support 103. Two rollers... Rollers 304 are rotatably connected to one end of the two pipe-holding frames 303 respectively. The outer side of rollers 304 is slidably connected to the outer side wall of lifting frame 302. Two pipe-holding blocks 306 are ball-jointed to the other end of the two pipe-holding frames 303 respectively. Another pipe-holding block 306 is hinged to the top of lifting frame 302. Two connecting arm mechanisms 307 are installed between lifting frame 302 and two pipe-holding frames 303. The pipe-holding block 306 is a comma-shaped cam or an arc-shaped block structure with teeth.

[0051] Both connecting arm mechanisms 307 are composed of a connecting frame 371, a drive slide 372, a first slider 373, and a second slider 374;

[0052] One end of the connecting frame 371 is hinged to the bottom of the inner wall of the fixed support 101 or the movable support 103. The drive slide 372 is opened on one side of the connecting frame 371. One end of the first slider 373 is fixedly connected to one side of the lifting frame 302. The outer side wall of the first slider 373 is slidably connected to the inner side wall of the drive slide 372. One end of the second slider 374 is fixedly connected to one side of the pipe clamping frame 303. The outer side wall of the second slider 374 is slidably connected to the inner side wall of the connecting frame 371.

[0053] The drive screw 305 is driven to rotate by the geared motor 301. The rotating drive screw 305 drives the lifting frame 302 to move upward by the thread. The moving lifting frame 302 drives the pipe holding frame 303 to rotate by the slope of its side and the roller 304. The roller 304 is used to reduce the friction between the lifting frame 302 and the pipe holding frame 303. At the same time, the moving lifting frame 302 drives the connecting frame 371 to move by the first slider 373 and the drive slide 372. The moving connecting frame 371 follows the movement of the second slider 374. There is a margin between the connecting frame 371 and the second slider 374 to avoid restricting the movement. The drive slide 372 can also be set as a slide with an arc.

[0054] like Figure 3 and Figure 9 As shown, in one embodiment, the tube winding drive mechanism 4 includes a drive motor 401, a drive sprocket 402, a synchronous chain 403, two driven sprockets 404, two gears 405, and a C-shaped toothed ring 406.

[0055] The drive motor 401 is mounted on one side of the welding support 102. The drive sprocket 402 is fixedly connected to the output shaft of the drive motor 401. Two driven sprockets 404 and gears 405 are rotatably connected to the middle of the outer side walls of the two connecting screws 204. The two driven sprockets 404 and gears 405 are fixedly connected to each other. The synchronous chain 403 is meshed with the outer side walls of the two driven sprockets 404 and the drive sprocket 402. The C-shaped toothed ring 406 is slidably connected to the inner side wall of the welding support 102. The outer side wall of the C-shaped toothed ring 406 is meshed with the outer side walls of the two gears 405 respectively.

[0056] The output shaft of the drive motor 401 drives the drive sprocket 402 to rotate. The rotating drive sprocket 402 drives two driven sprockets 404 to rotate synchronously via the synchronous chain 403. The rotating driven sprockets 404 drive the C-shaped toothed ring 406 to move within the welded support 102 via the gear 405.

[0057] like Figure 8 and Figure 9 As shown, in one embodiment, the welding drive mechanism 5 includes a second hydraulic cylinder 501, a shelf 502, a third hydraulic cylinder 503, a traction block 504, and a mounting bracket 505;

[0058] The mounting bracket 505 is detachably mounted on one end of the C-shaped toothed ring 406. The second hydraulic cylinder 501 is mounted on one side of the second hydraulic cylinder 501. The shelf 502 is fixedly connected to one end of the piston rod of the second hydraulic cylinder 501. The third hydraulic cylinder 503 is mounted on one side of the shelf 502. The traction block 504 is slidably connected to the inner wall of the shelf 502. One end of the piston rod of the third hydraulic cylinder 503 is fixedly connected to one side of the traction block 504.

[0059] The piston rod of the third hydraulic cylinder 503 pushes the traction block 504 to reciprocate within the shelf 502, so that the moving traction block 504 can drive the welding unit 6 to reciprocate in a small amplitude; the piston rod of the second hydraulic cylinder 501 drives the shelf 502 to move towards the central axis of the pipe, and the distance between the welding unit 6 and the butt joint can be adjusted according to actual needs.

[0060] like Figure 8 As shown, in one embodiment, the welding unit 6 includes a welding frame 601, an arc welding module 602, a wire feeding module 603, and a tube bundle frame 604;

[0061] One end of the welding frame 601 is fixedly connected to the bottom of the traction block 504, the outer wall of the welding frame 601 is slidably connected to the inner wall of the shelf 502, the arc welding module 602 is installed on the inner wall of the welding frame 601, the wire feeding module 603 is installed on one side of the welding frame 601, and the bundle tube frame 604 is fixedly connected to one side of the mounting frame 505.

[0062] The wire feeding module 603 delivers the welding wire to the joint. The arc welding module 602 uses current to melt the welding wire into a liquid state at the joint to form a molten pool and provides protective gas to isolate the air outside the welding area and prevent oxidation of the welding area. The tube bundle frame 604 constrains the pipes connected to the arc welding module 602 and the wire feeding module 603.

[0063] When the present invention is in operation: First, the pipe to be welded is beveled according to actual needs. Then, a pipe is placed on two fixed supports 101 and the position of the pipe is adjusted so that the arc welding module 602 is located above the pipe bevel.

[0064] When pipe fixing is required, the reduction motor 301 is activated to drive the drive screw 305 to rotate. The rotating drive screw 305 uses its thread to drive the lifting frame 302 upward. The moving lifting frame 302, with its side slope and rollers 304, drives the pipe clamping frame 303 to rotate. The rollers 304 are used to reduce the friction between the lifting frame 302 and the pipe clamping frame 303. At the same time, the moving lifting frame 302 uses the first slider 373 and the drive groove 372 to drive the connecting frame 371 to move. The moving connecting frame 371 follows the movement of the second slider 374. Then, the upward-moving lifting frame 302, together with the two moving pipe clamping frames 303, drives the pipe clamping block 306 to press and fit against the pipe wall to clamp and fix the pipe. The pipe clamping block 306 on the pipe clamping frame 303 is connected by a ball joint, which can be adjusted according to actual needs to ensure full fit with the pipe wall.

[0065] Then, the operation is repeated, placing the other pipe to be welded on the movable support 103 and clamping it using the pipe clamping assembly 3. After clamping and fixing, the piston rod of the first hydraulic cylinder 202 drives the traction pipe 203 to move. The moving traction pipe 203 drives the movable support 103 to move as a whole, so as to move the pipe to the other pipe for docking. The pipe clamping block 306 is used to further engage the pipe during the docking process by using resistance, thereby increasing the stability of the pipe docking and effectively preventing the clamped and fixed pipe from slipping.

[0066] After the pipe connection is completed, the piston rod of the second hydraulic cylinder 501 drives the entire shelf 502 to move towards the central axis of the pipe. The distance between the arc welding module 602 and the joint is adjusted according to actual needs. When welding is required, the wire feeding module 603 delivers the welding wire to the joint. Then, the arc welding module 602 uses current to melt the welding wire into a liquid state at the joint to form a molten pool and provides a protective gas to isolate air outside the weld area and prevent oxidation. Then, the piston rod of the third hydraulic cylinder 503 pushes the traction block 504 to reciprocate within the shelf 502. The traction block 504 drives the welding frame 601 to reciprocate in small amplitudes to control the direction of the molten pool and increase the coverage of the welding area. At the same time, the output shaft of the drive motor 401 drives the drive sprocket 402 to rotate. The rotating drive sprocket 402 drives two driven sprockets 404 to rotate synchronously via the synchronous chain 403. The rotating driven sprockets 404 drive the C-shaped toothed ring 406 to move within the welding support 102 via the gear 405. The moving C-shaped toothed ring 406 then drives the mounting frame 505 to move in a ring along the pipe joint, so as to gradually complete the overall welding operation of the pipe.

[0067] After the pipe welding is completed, simply restart the drive motor 401 to drive the C-shaped toothed ring 406 to reset, so that it retracts into the welding support 102. Then, start the reduction motor 301 to drive the drive screw 305 to rotate in the opposite direction. The reverse-rotating drive screw 305 can then drive the lifting frame 302 to reset. During the resetting process of the lifting frame 302, the first slider 373, in conjunction with the drive groove 372, drives the connecting frame 371 to move. The moving connecting frame 371, in conjunction with the second slider 374, drives the pipe clamping frame 303 to reset, so that the pipe clamping block 306 separates from the pipe wall, allowing the pipe to be directly removed from the equipment.

[0068] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in the present invention, and these should all be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A pipe welding device for hydraulic construction, comprising a base assembly (1) and a docking mechanism (2) having a connecting screw (204), characterized in that, The base assembly (1) includes a fixed support (101), a welded support (102), and a movable support (103). Among them, there are two fixed supports (101), one movable support (103) is provided on one side of the fixed support (101), one welding support (102) is provided between the fixed support (101) and the movable support (103), one docking mechanism (2) is installed between the fixed support (101) and the movable support (103), and one connecting screw (204) is connected between the fixed support (101), the welding support (102) and the movable support (103). The movable support (103) is used to drive the moving support (103) to reciprocate along the connecting screw (204). Both the fixed support (101) and the movable support (103) are equipped with pipe clamping assemblies (3) for clamping and fixing the pipes to be welded, and for placing pipes of different inner diameters on the same central axis. The welding support (102) is equipped with a pipe winding drive mechanism (4). A welding drive mechanism (5) and a welding unit (6) are installed on one side of the pipe winding drive mechanism (4). The pipe winding drive mechanism (4) is used to drive the welding drive mechanism (5) and the welding unit (6) to move in a ring along the pipe joint, and cooperates with the welding drive mechanism (5) to fine-tune the distance between the welding unit (6) and the joint. The welding unit (6) is used to perform welding operations on the joint.

2. The pipeline welding equipment for water conservancy construction according to claim 1, characterized in that: The docking mechanism (2) also includes a limiting frame (201), a first hydraulic cylinder (202), and a traction pipe (203); The limiting frame (201) is symmetrically fixedly connected to both sides of the fixed support (101). There are two first hydraulic cylinders (202), which are respectively installed on the inner side wall of the limiting frame (201). The traction pipe (203) is symmetrically fixedly connected to both sides of the moving support (103). The piston rod of the first hydraulic cylinder (202) is fixedly connected to one end of the traction pipe (203). There are four connecting screws (204).

3. The pipeline welding equipment for water conservancy construction according to claim 1, characterized in that: Each of the pipe-holding assemblies (3) includes a geared motor (301), a lifting frame (302), two pipe-holding frames (303), two rollers (304), a drive screw (305), three pipe-holding pressure blocks (306), and two connecting arm mechanisms (307). The geared motor (301) is installed at the bottom of the inner wall of the fixed support (101) or the movable support (103). The lifting frame (302) is slidably connected to the bottom of the inner wall of the fixed support (101) or the movable support (103). One end of the drive screw (305) is fixedly connected to the output shaft of the geared motor (301). The outer wall of the drive screw (305) is threadedly connected to the inner wall of the lifting frame (302). The two pipe clamps (303) are symmetrically hinged to the fixed support (101) or the movable support. At the top of the inner wall of the seat (103), two rollers (304) are rotatably connected to one end of the two pipe-holding frames (303), the outer side of the rollers (304) is slidably connected to the outer wall of the lifting frame (302), two pipe-holding blocks (306) are ball-jointed to the other end of the two pipe-holding frames (303), and another pipe-holding block (306) is hinged to the top of the lifting frame (302). Two connecting arm mechanisms (307) are installed between the lifting frame (302) and the two pipe-holding frames (303).

4. The pipeline welding equipment for water conservancy construction according to claim 3, characterized in that: Both of the aforementioned connecting arm mechanisms (307) are composed of a connecting frame (371), a drive slide (372), a first slider (373), and a second slider (374); One end of the connecting frame (371) is hinged to the bottom of the inner wall of the fixed support (101) or the movable support (103). The driving slide (372) is opened on one side of the connecting frame (371). One end of the first slider (373) is fixedly connected to one side of the lifting frame (302). The outer side wall of the first slider (373) is slidably connected to the inner wall of the driving slide (372). One end of the second slider (374) is fixedly connected to one side of the pipe clamp (303). The outer side wall of the second slider (374) is slidably connected to the inner wall of the connecting frame (371).

5. The pipeline welding equipment for water conservancy construction according to claim 1, characterized in that: The winding drive mechanism (4) includes a drive motor (401), a drive sprocket (402), a synchronous chain (403), two driven sprockets (404), two gears (405), and a C-shaped toothed ring (406). The drive motor (401) is mounted on one side of the welding support (102), the drive sprocket (402) is fixedly connected to the output shaft of the drive motor (401), the two driven sprockets (404) and the gear (405) are respectively rotatably connected to the middle of the outer side wall of the two connecting screws (204), the two driven sprockets (404) and the gear (405) are respectively fixedly connected to each other, the synchronous chain (403) is meshed with the outer side wall of the two driven sprockets (404) and the drive sprocket (402), the C-shaped toothed ring (406) is slidably connected to the inner side wall of the welding support (102), and the outer side wall of the C-shaped toothed ring (406) is meshed with the outer side wall of the two gears (405) respectively.

6. The pipeline welding equipment for water conservancy construction according to claim 5, characterized in that: The welding drive mechanism (5) includes a second hydraulic cylinder (501), a shelf (502), a third hydraulic cylinder (503), a traction block (504), and a mounting bracket (505); The mounting bracket (505) is detachably mounted on one end of the C-shaped toothed ring (406), the second hydraulic cylinder (501) is mounted on one side of the second hydraulic cylinder (501), the shelf (502) is fixedly connected to one end of the piston rod of the second hydraulic cylinder (501), the third hydraulic cylinder (503) is mounted on one side of the shelf (502), the traction block (504) is slidably connected to the inner wall of the shelf (502), and one end of the piston rod of the third hydraulic cylinder (503) is fixedly connected to one side of the traction block (504).

7. The pipeline welding equipment for water conservancy construction according to claim 6, characterized in that: The welding unit (6) includes a welding frame (601), an arc welding module (602), a wire feeding module (603), and a tube bundle frame (604). One end of the welding frame (601) is fixedly connected to the bottom of the traction block (504), the outer side wall of the welding frame (601) is slidably connected to the inner side wall of the shelf (502), the arc welding module (602) is installed on the inner side wall of the welding frame (601), the wire feeding module (603) is installed on one side of the welding frame (601), and the tube bundle frame (604) is fixedly connected to one side of the mounting frame (505).

8. The pipeline welding equipment for water conservancy construction according to claim 2, characterized in that: The outer walls of the four connecting screws (204) are threaded with a number of nuts (71) to fix the connecting screws (204) to the two fixed supports (101) and to limit the maximum stroke of the movable support (103).

9. The pipeline welding equipment for water conservancy construction according to claim 3, characterized in that: The tube clamping block (306) is a comma-shaped cam or an arc-shaped block structure with teeth.

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