CN113510345A - Welding device and process applied to large water delivery pipe in tunnel - Google Patents

Abstract

The invention relates to a welding device and a welding process applied to a large water pipe in a tunnel, which comprise a welding machine assembly capable of welding a butt joint of the water pipe, wherein the welding machine assembly is adjustably arranged on a support shaft assembly, so that when the support shaft assembly is arranged in the water pipe to be welded in a penetrating way, the welding machine assembly can continuously change the working position on a preset track along the circumferential direction of the butt joint and/or the axial direction of the water pipe, and further the uninterrupted welding of the butt joint is completed; the support shaft assembly at least comprises an outer sleeve rod and an inner shaft rod, wherein the outer sleeve rod drives the water pipe to be welded to move through a butt joint support assembly and a water pipe support assembly which are arranged on the surface of the outer sleeve rod and can support and limit the water pipe to be welded; the outer sleeve rod is sleeved on the inner shaft rod in a mode of driving the water pipe to be welded to rotate or translate; the support shaft assembly can adjust the position of the water pipe to be welded, so that the water pipe to be welded can be in butt joint with the second water pipe without dislocation.

Description

Welding device and process applied to large water delivery pipe in tunnel

Technical Field

The invention relates to the technical field of butt welding of pipelines, in particular to a welding device and a welding process applied to a large water pipe in a tunnel.

Background

The large-size water delivery pipe applied to the tunnel is widely applied to water taking engineering, but the engineering has high requirements on materials, high construction difficulty, more installation and treatment details and miscellaneous cautions.

The large-diameter water conveying pipeline with the diameter reaching 2600mm has the following obvious characteristics: the internal water pressure born by the steel can reach 3.0MPa, and the elongation, the rigidity and the tensile strength of the steel are all larger; the pipe fittings have complete specifications and can meet various installation requirements; the connector is various, the assembly and disassembly are convenient, the local subsidence bearing capacity is strong, and the maintenance is convenient; the surface is usually anticorrosive and sprayed with a zinc layer and asphalt, so that the corrosion resistance is strong; generally having a service life of 50 years. The large-diameter water pipe has the above good quality and is often used in water conservancy and hydropower engineering, water intake engineering and the like.

However, the gaps between the pipes are different in size and the axes of the two pipes are not coincident when the current large-size pipeline is actually installed, and the two welded pipes have included angles, so that welding materials in a welding seam are not uniformly distributed, and the long-term use in the later period is not facilitated. In addition, the existing large-diameter water delivery pipe can also cause the pipe body to deform to a certain extent due to transportation collision or dead weight, the section roundness of the pipe body cannot meet the requirement during actual welding, a welding device which can perform one-time complete circular ring welding on the annular inner seam of the large-size water delivery pipe is not available at present, welding pause usually occurs, single-layer welding is enabled to occur multiple cold joints, and the welding quality is greatly reduced. Therefore, it is necessary to design a butt welding device for a water pipe, which can perform annular welding stably and perform deformation adjustment and roundness adjustment on a large-size water pipe.

Chinese patent CN105547005A discloses a butt-welding structure for large-size thin-wall interfaces, wherein a connection intermediate piece similar to a flange structure, called a dummy flange for short, is arranged between an exhaust port of a low-pressure cylinder of a steam turbine and an inlet of a throat of a condenser, the connection intermediate piece is plate-shaped, the exhaust port of the low-pressure cylinder of the steam turbine is welded to one side of the connection intermediate piece, and the inlet of the throat of the condenser is welded to the other side of the connection intermediate piece. Although the patent improves the alignment correction degree during welding of the large-size interface to a certain extent, the roundness of the large-size water pipe cannot be corrected, and a complete and uninterrupted annular welding operation cannot be completed.

Chinese patent CN102672312A discloses a large wire coil automatic tube plate welding machine, which comprises a welding head, a wire feeding device, a wire coil welding wire and a frame, wherein the wire coil welding wire is the large wire coil welding wire and is positioned outside the welding head; the wire feeding device is positioned between the welding head and the large wire coil welding wire; the welding machine head, the wire feeding device and the large wire disc welding wires are sequentially arranged on the cross arm mechanism of the frame; the large wire coil welding wire is connected to a welding head through a wire feeding device, and in addition, the large wire coil welding wire is also provided with a welding wire anti-winding kit. The invention has the advantages that: the large wire coil welding wire is a standard part, so that the purchase is economical and convenient; the coiling looseness of the welding wire caused by manual wire winding is avoided, and meanwhile, the welding wire anti-winding mechanism is additionally arranged, so that the welding quality is ensured; the large wire coil welding wire is positioned outside the welding machine, the replacement and installation are simple and quick, and the replacement frequency is greatly reduced, so that the production efficiency is improved; and the probability of the failure of the welding machine is reduced, and the service life of the welding machine is prolonged. This patent can satisfy the demand of single, long welding distance, but it does not relate to the deformation and adjusts the structure, can't inject the original shape of easy deformation components such as jumbo size raceway to can't guarantee the welded accuracy.

Furthermore, on the one hand, due to the differences in understanding to the person skilled in the art; on the other hand, since the inventor has studied a lot of documents and patents when making the present invention, but the space is not limited to the details and contents listed in the above, however, the present invention is by no means free of the features of the prior art, but the present invention has been provided with all the features of the prior art, and the applicant reserves the right to increase the related prior art in the background.

Disclosure of Invention

Aiming at the defects of the prior art, the technical scheme provided by the invention is a welding device applied to a large water pipe in a tunnel, which comprises a welding machine assembly capable of welding the butt joint of the water pipe, wherein the welding machine assembly is adjustably arranged on a support shaft assembly, so that when the support shaft assembly is arranged in the water pipe to be welded in a penetrating manner, the welding machine assembly can continuously change the working position along the circumferential direction of a welding line and/or the axial direction of the water pipe on a preset track, and further the uninterrupted welding of the welding line is completed; the support shaft assembly at least comprises an outer sleeve rod and an inner shaft rod, wherein the outer sleeve rod drives the water pipe to be welded to move through a butt joint support assembly and a water pipe support assembly which are arranged on the surface of the outer sleeve rod and can support and limit the water pipe to be welded; the outer sleeve rod is sleeved on the inner shaft rod in a mode of driving the water pipe to be welded to rotate or translate; the support shaft assembly can adjust the position of the water pipe to be welded, so that the water pipe to be welded can be in butt joint with the second water pipe without dislocation. The butt welding device has the advantages that the angle, the distance, the height, the roundness and the like of the water pipes can be selectively adjusted according to the butt joint condition of the two water pipes, so that the butt welding end faces of the two water pipes can be in butt joint with equal gaps, and the bad conditions that the butt welding cannot be well performed or is not in place, the welding quality cannot reach the standard and the like of the large-diameter water pipe due to the size deformation of the butt joint port are avoided.

According to a preferred embodiment, the butt joint support assemblies are arranged on an outer sleeve rod of the support shaft assembly in a circumferential arrangement manner, and a limit adjusting rod of each butt joint support assembly can extend or shorten along the radial direction of the outer sleeve rod, so that one end, away from the outer sleeve rod, of each limit adjusting rod is positioned and supported on the inner wall of the water pipe to be welded in a manner that the extended butt joint support assembly can adjust the deformation degree and/or roundness of the water pipe to be welded; and the rod body of the limit adjusting rod is connected with the annular slide rail of the welding machine assembly, so that the limit adjusting rod is supported at one end of the to-be-welded water pipe, which forms a bevel surface, and the roundness of the end surface of the to-be-welded water pipe is corrected. The welding device has the advantages that the profile of the end face to be welded of the water pipe to be welded is corrected, so that the bad deformation caused in the transportation process and the deformation caused by the dead weight of the water pipe to be welded are eliminated, the end face of the water pipe to be welded can be limited and adjusted to be a circular face within a certain roundness threshold range, and the end face of the water pipe to be welded is correspondingly subjected to butt welding without dislocation with the second water pipe.

According to a preferred embodiment, the welding machine assembly at least comprises a sliding guide rail, a welding table and a moving assembly, wherein the moving assembly is supported on the welding table, the surface of the welding table, which is far away from the moving assembly, is further connected with the sliding guide rail, and the welding table is clamped on the annular slide rail of the sliding guide rail in a manner that the welding table can directionally move on the annular slide rail; the moving assembly can move circumferentially on an annular slide rail formed by the sliding guide rail along with the welding table; the sliding guide rail is installed on the outer loop bar, and the sliding guide rail is connected with the limit adjusting rod in a mode of providing supporting force for the butt joint supporting assembly. The welding machine has the advantages that the welding machine can be driven by the welding table to move on the sliding guide rail in a directional mode, and can also move in the width direction of the welding line under the action of the moving assembly, so that the welding operation of an annular process can be completed uninterruptedly, the occurrence of abnormal conditions such as interruption of single-layer welding is effectively reduced, the number of cold joints is reduced, and the welding quality is improved.

According to a preferred embodiment, the butt joint support assembly comprises the limit adjusting rod and an adjusting rod driving part, and the limit adjusting rod is driven by the adjusting rod driving part to extend or contract along the radial direction of the outer sleeve rod; the limiting adjusting rod at least comprises a first sleeve, a second inner rod and a third sleeve, wherein the second inner rod is sequentially sleeved with the third sleeve and the first sleeve, the third sleeve can be arranged between the first sleeve and the second inner rod in a rotating mode relative to the first sleeve and the second inner rod, and one end, far away from the second inner rod, of the third sleeve penetrates out of one end, close to the outer sleeve, of the first sleeve.

According to a preferred embodiment, the adjusting lever driving part comprises a driving motor, a second bevel gear and a housing, the housing is mounted on the outer thimble in a manner of limiting the relative position of the butt joint supporting assembly and the outer thimble, one end of the third sleeve close to the outer thimble is inserted into the housing, and the third sleeves of the plurality of circumferentially arranged limit adjusting levers are engaged with the same second bevel gear, so that the plurality of limit adjusting levers are synchronously lengthened or shortened.

According to a preferred embodiment, the water pipe supporting member at least comprises a plurality of first supporting rods and a first hydraulic rod, wherein one end of each first supporting rod is movably connected with the first hydraulic rod, and both one end of each first supporting rod far away from the first hydraulic rod and one end of each first hydraulic rod far away from the first supporting rod are connected to the outer sleeve rod; the outer sleeve rod is limited by the first support rod and the first hydraulic rod, and a part of the rod body, the first support rod and the first hydraulic rod jointly form a support triangle with an adjustable included angle, so that the first support rod rotates along with the extension or the shortening of the first hydraulic rod, and one end, far away from the outer sleeve rod, of the first support rod is positioned and supported on the inner wall of the water delivery pipe to be welded.

According to a preferred embodiment, the butt joint positioning assembly at least comprises a plurality of second support rods and a second hydraulic rod, wherein one end of each second support rod is movably connected with the second hydraulic rod, and one end of each second support rod, which is far away from the second hydraulic rod, and one end of each second hydraulic rod, which is far away from the second support rod, are connected to a part of rod body of which the inner shaft rod is inserted into the second water delivery pipe; the inner shaft rod is limited by the second support rod and the second hydraulic rod, and a part of the rod body, the second support rod and the second hydraulic rod jointly form a support triangle with an adjustable included angle, so that the second support rod rotates along with the extension or the shortening of the second hydraulic rod, and one end of the second support rod, which is far away from the inner shaft rod, is positioned and supported on the inner wall of the second water conveying pipe.

According to a preferred embodiment, one end of the support shaft assembly, which is located outside the water pipe to be welded, is further connected with a driving assembly capable of adjusting the height of the support shaft assembly and driving the support shaft assembly to move, and the driving assembly at least comprises a rotation driving unit capable of driving the outer sleeve rod to rotate, a translation driving unit driving the outer sleeve rod to translate relative to the inner shaft rod, and a shaft sleeve limiting the relative position of the driving assembly and the inner shaft rod.

The invention also provides a welding process applied to the welding of the large water delivery pipe in the tunnel, which comprises the following steps:

cleaning dirt on the to-be-welded bevel face of two large-size water delivery pipes and polishing;

adjusting the distance between the pipe to be welded and the second pipe body sent into the tunnel, the included angle of the axes, the dimensional deformation degree, the roundness and the like of the two sections of water conveying pipes by using the butt welding device;

adjusting the welding gun assembly to enable the welding gun to be at a relative position with a set distance from the welding seam, driving the welding gun to run on the circular track in a trial mode, checking whether the distance between the welding gun and the welding seam is changed greatly or not,

when the welding gun slides on the annular guide rail and the distance between the welding gun and the welding line is changed beyond the threshold range, the deformation degree and/or the roundness of the water pipe are adjusted by controlling the butt joint supporting assembly, the water pipe supporting assembly, the butt joint positioning assembly and the supporting shaft assembly to move;

preparing welding materials and checking whether relevant functional equipment is good or not;

and carrying out multi-layer welding and cleaning in multiple times.

According to a preferred embodiment, said multilayer welding and cleaning comprises at least:

s1: tack welding → S2: sanding and cleaning → S3: backing weld → S4: sanding and cleaning → S5: fill weld → S6: sanding and cleaning → S7: cover welding → S8: cleaning the welding head after the welding head is welded,

wherein, the threshold range of the minimum distance between two sections of water pipes is 2-3mm, the thickness of the minimum distance is 2mm, and the angle of the formed V-shaped groove is 60 degrees.

Drawings

Fig. 1 is a schematic structural diagram of a welding device and a welding process for a large water pipe in a tunnel according to a preferred embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a welder assembly of the welding device applied to a large water pipe in a tunnel according to the present invention;

fig. 3 is a schematic structural diagram of a butt-joint support assembly of the welding device applied to a large water pipe in a tunnel according to the present invention;

fig. 4 is a schematic diagram of a welding device applied to a large water pipe in a tunnel, which needs to have a welding head dislocated during multilayer welding.

List of reference numerals

1: the welding machine component 2: butt joint supporting component 3: water delivery pipe supporting component

4: butt joint locating component 5: the support shaft assembly 6: drive assembly

11: sliding guide rail 12: a welding table 13: moving assembly

14: first moving assembly 15: the second moving assembly 16: welding machine mounting part

17: a welding machine 111: the annular slide rail 112: sliding block

113: the blocking piece 121: the platform main body 122: clamping base

141: first moving rail 142: first moving screw 143: first drive unit

151: second moving guide 152: second moving rail 153: second drive unit

154: fixing plate 21: the limit adjusting rod 22: adjusting rod driving part

211: first sleeve 212: second inner bar 213: third sleeve

214: a stopper 215: first bevel gear 221: driving motor

222: the second bevel gear 223: the housing 31: first support rod

32: first hydraulic lever 33: first support base plate 34: first hydraulic base plate

41: second support bar 42: second hydraulic rod 43: second support base plate

44: second hydraulic base plate 51: outer loop bar 52: inner shaft lever

61: the rotation driving unit 62: the translation drive unit 63: shaft sleeve

64: the drive housing 65: height adjustment lever 66: base seat

Detailed Description

The following detailed description is made with reference to the accompanying drawings.

Example 1

The invention provides a welding process applied to welding of a large-size water pipe in a tunnel, which can adjust the deformation of the large-size water pipe to enable the section roundness to be in an appropriate range, can adjust the height and the angle of the water pipe according to actual requirements, and particularly can rotate the water pipe to be welded to enable the water pipe to be welded and a second water pipe to be welded to be in butt joint without dislocation so as to form an annular butt welding seam with uniform welding seam size.

The welding process comprises the following specific steps:

(1) cleaning dirt on the to-be-welded bevel face of two large-size water delivery pipes and polishing;

(2) adjusting the distance between the pipe to be welded and the second pipe body sent into the tunnel, the included angle of the axes, the dimensional deformation degree, the roundness and the like of the two sections of water conveying pipes by using the butt welding device;

(3) adjusting the welding gun assembly to enable the welding gun to be at a relative position with a set distance from the welding seam, driving the welding gun to run on the circular track in a trial mode, checking whether the distance between the welding gun and the welding seam is changed greatly or not,

if the distance between the welding gun and the welding seam changes when the welding gun slides on the annular guide rail, the deformation degree and/or the roundness of the water pipe are/is adjusted by controlling the butt joint supporting component 2, the water pipe supporting component 3, the butt joint positioning component 4 and the supporting shaft component 5 to move;

(4) preparing welding materials and checking whether the relevant functional equipment of the welding machine is in good condition;

(5) performing multi-layer welding

S1: tack welding → S2: sanding and cleaning → S3: backing weld → S4: sanding and cleaning → S5: fill weld → S6: sanding and cleaning → S7: cover welding → S8: cleaning the welding head after the welding head is welded,

wherein, the threshold range of the minimum distance between two sections of water pipes is 2-3mm, the thickness of the minimum distance is 2mm, and the angle of the formed V-shaped groove is 60 degrees.

According to relevant actual operation tests, test use parameters are determined firstly, the welding parameters serve as reference values, the data in the table are increased and decreased appropriately according to actual conditions, and the welding current basically cannot break through the upper limit value in the table. The test parameters of each welding position of argon arc welding and full-automatic gas shielded welding are as follows:

argon arc welding and full-automatic gas shielded welding all welding position test parameters

General considerations for welding:

(1) before welding, the welding current is adjusted on the waste pipe, and then formal welding is allowed to be carried out on the pipeline;

(2) when argon arc welding is performed, the welding speed is flexibly controlled by an operator on the premise of ensuring the required size and quality of a welding line. The speed is too slow, the heat affected zone is widened, the crystal grains are large, and the deformation is also large; the speed is too high, and the defects of incomplete penetration and fusion, poor weld forming and the like are easily caused;

(3) in the backing welding process, the arc length is generally expected to be always consistent, and short arc welding is used as far as possible;

(4) when argon arc welding is performed, the diameter of the nozzle is increased, the gas flow is increased, and at the moment, the protection area is large, and the protection effect is good. However, when the nozzle is too large, not only the consumption of argon gas increases, but also the torch may not be extended or the view of the welder may be obstructed, which makes the operation of observation inconvenient. According to the past construction experience and market supply conditions, the argon tungsten-arc welding nozzle is selected to be 10 mm;

(5) after argon arc welding starts, the workpiece is heated by electric arc, welding wires can be added after a molten pool is formed, the welding speed is slow, a plurality of welding wires are added, and welding seams are thickened to prevent cracks. The speed should be reduced during arc-extinguishing to avoid craters or cracks. The length of the welding wire is planned during welding, and the midway welding wire replacement is avoided as much as possible, so that the frequency of cold joints is reduced, and the possibility of welding defects is reduced;

(6) when argon arc welding is carried out, the end part of a tungsten electrode is ground into a diameter of 0.5mm and a taper of 8mm, so that electric arcs are stable and concentrated and are not easy to drift. When in use, the length of the tungsten electrode extending out of the nozzle is 6 mm-8 mm;

(7) the welding voltage must be well matched to the welding current. The welding voltage is over high or over low to cause splashing, the welding voltage is increased along with the increase of the welding current and reduced along with the reduction of the welding current, the optimal welding voltage is generally between 1 and 2 volts, and therefore the welding voltage is carefully debugged;

(8) normally, the weld should be completed continuously without interrupting the weld. When welding is interrupted for any reason, anti-cracking measures should be taken. Before re-welding, the surface is cleaned, and after no crack is confirmed, the welding can be continued according to the original process;

(9) cleaning the surface coating of the welding seam after each layer and each welding seam are welded to the previous layer, and then welding the next layer. When defects such as air holes, slag inclusion, welding beading and the like are found in the welding process, an angle grinder is used for grinding the defects in time, and welding can be continued after the defects are eliminated;

(10) when a joint is arranged in the middle of the welding seam, the electric arc is ignited at the position 15-25 mm in front of the welding joint by adopting a scratching method no matter what welding position, and then the electric arc is immediately pulled back to the joint to start normal welding. The welding joints in each layer and the welding middle part of each welding are staggered;

(11) in order to ensure that a welding joint has good comprehensive performance, when multi-layer and multi-channel welding is carried out, the transverse swing width is required to be strictly controlled to be not more than 4 times of the diameter of a welding core, and the thickness of a welding seam of each layer and each channel is required to be not more than the diameter of the welding core;

(12) when welding, the welding starting point and the welding ending point of the welding bead and the joint of the welding bead do not generate welding defects, when welding is carried out on multiple layers and multiple channels, the joints at the welding rod changing positions of each layer (channel) are staggered, and when a welding seam is welded, impurities such as slag, splashing and the like need to be cleaned, the quality of the welding seam is checked seriously, and the next welding seam is welded after no defect is confirmed. (if the prior welding seam is found to be defective, the welding defect must be thoroughly cleared before the welding is allowed to continue);

(13) the gas shielded welding wire extension length is related to current, and the larger the current is, the longer the welding wire extension length is, the larger the resistance heat of the welding wire is, the higher the melting speed of the welding wire is, the welding wire is easy to fuse in sections, and the welding process is unstable due to splashing. When the extension length of the welding wire is too short, spatter is easy to block the nozzle, and sometimes the spatter is melted into a molten pool, so that poor weld formation is caused. The general empirical formula is that the stick-out is ten times the diameter of the wire.

The welding requirement is as follows:

(1) the water pipe is aligned and corrected before welding, the circumferential misalignment is not more than 2.7mm,

the mouth aligning device is adopted for aligning the mouth, and strong force alignment is avoided when the mouth pipe is aligned. The sizes of all parts of the butt joint are checked in the pipeline butt joint, the pipe end is rounded, the pipeline is straightened, the staggered joint is leveled and the like, the positioning welding fixation can be carried out after the pipe end completely meets the requirements, and the butt joint device is detached and then is comprehensively welded;

(2) the welding material is required to have product quality certification, the welding material is baked and stored according to the specification, the drying temperature is 120-150 ℃, the time is 1 hour, the heat preservation temperature is 100 ℃, the coating is free from falling off and cracking welding rods, the welding rods are placed in a special heat preservation box for random use, and the drying frequency of the welding rods is not more than two times;

(3) the positioning welding needs to be completely welded, and each welding line is welded at one time without shutdown;

(4) the multi-layer weld joints should be staggered, as shown in FIG. 4;

(5) the welding interface needs to meet the standard of GBT 9851-2008;

(6) before the butt welding, the inner surface and the outer surface are cleaned manually, and paint, burrs, oxides and other substances harmful to the welding process cannot be left in the range of 20mm on the two sides of the groove;

(7) after welding is finished, self-checking is carried out, and appearance defects are found and repaired in time;

(8) the internal quality of the pipeline welding seam is subjected to radiographic inspection, ultrasonic inspection, magnetic powder inspection and the like according to the design rule. The nondestructive inspection of the surface of the welding seam is carried out after the appearance inspection of the welding seam is qualified;

(9) strictly forbidding arc striking or arc breaking on the base metal, and arc striking and arc breaking of the tack welding are carried out in the groove;

(10) after the welding rod is arc-ignited, the arc column is lightly pressed at the root part of the groove, the molten drop is dragged downwards along the welding bead, if the coverage degree of the molten drop in the conveying strip is not enough, the arc can be conveyed back and forth, and the welding bead at the root part is smooth. The joint of the welding line can be slightly polished, and the deposited metal protruding in the welding bead of the root part is polished by a grinding wheel, so that the depth of the welding line is uniform, the transition is smooth, and slag inclusion is avoided. The interlayer temperature of filling welding is kept above 100 ℃;

(11) welding arc striking should be carried out in the groove, and arc striking on the pipe wall is strictly forbidden; the pipeline welding adopts multilayer welding, interlayer slag is cleaned during welding, appearance inspection is carried out, and the next layer of welding can be carried out after the welding is qualified;

(12) when a pipeline is welded, each welded junction must be continuously welded once, the welding of the next layer of welding bead cannot be started before the previous layer of welding bead is not completed, and the starting positions of two adjacent welding beads are staggered by 20-30 mm;

(13) after the pipeline is welded, splashes, slag and the like on the surface of the welded seam are removed.

Example 2

The invention provides a water pipe butt welding device for welding large-size water delivery pipe joints for water resource delivery in an underground tunnel. The angle, the distance, the height, the roundness and the like of the water pipes can be selectively adjusted according to the butt joint condition of the two water pipes, so that the butt joint welding end faces of the two water pipes can be in butt joint at equal intervals, and the bad conditions that the large-diameter water pipe cannot be well in butt joint welding or is not in place in welding, the welding quality does not reach the standard and the like due to the size deformation of the butt joint port are avoided.

According to a specific embodiment, as shown in fig. 1, the butt welding device comprises a welder assembly 1, a butt support assembly 2, a water pipe support assembly 3, a butt positioning assembly 4, a support shaft assembly 5 and a driving assembly 6. The annular track of the welding machine assembly 1 is arranged on a certain section of the shaft lever of the support shaft assembly 5, so that when the axis of the support shaft assembly 5 is superposed with the axis of the water pipe, the welding machine assembly 1 can complete welding of butt-jointed seams of the two sections of water pipes in a circular motion mode along the annular track. A plurality of support rod bodies of the butt joint support assembly 2 are provided on the support shaft assembly 5 in such a manner as to be extendable in the radial direction of the shaft of the support shaft assembly 5. The circular track of the welding machine component 1 is also connected with the butt joint supporting component 2 in a mode of limiting the position of the butt joint supporting component 2, so that the butt joint supporting component 2 can be stably supported on the inner wall of a water pipe to be welded, the butt joint supporting components 2 distributed along the circumferential direction of the shaft rod of the supporting shaft component 5 can limit the roundness of the water pipe to be welded sleeved on the supporting shaft component 5 in a mode of simultaneously extending or shortening, the size deformation degree of the water pipe to be welded is adjusted, the water pipe to be welded can be kept in a set roundness range, and the butt joint welding of the water pipe to be welded and a second water pipe in corresponding positions is facilitated. The water pipe supporting component 3 is arranged on the supporting shaft component 5, and the water pipe supporting component 3 is used for supporting the inner wall of the other end, away from the butt welding, of the water pipe to be welded, so that both ends of the water pipe to be welded can be supported and adjusted, the roundness, the angle and the deformation degree of the whole water pipe to be welded can be adjusted to be within an allowable error range, and the water pipe to be welded is conveniently butted with a second water pipe. The butt joint positioning component 4 is arranged at one end, far away from the water pipe supporting component 3, of the butt joint supporting component 2, and the butt joint positioning component 4 is also connected with the supporting shaft component 5. The support shaft assembly 5 is used for simultaneously connecting the butt-joint support assembly 2, the water pipe support assembly 3, the butt-joint positioning assembly 4 and the driving assembly 6, wherein, the butt-joint support assembly 2, the support surfaces of the water pipe support assembly 3 and the butt-joint positioning assembly 4 are all perpendicular to the axis of the support shaft assembly 5, so when the butt-joint positioning assembly 4 can limit and adjust the size deformation degree and the roundness of the second water pipe and the port of the water pipe to be welded, which is limited by the butt-joint support assembly 2 and the water pipe support assembly 3 and simultaneously supported, can be butted with the second water pipe in a mode matched with the end face profile of the second water pipe, and the accurate butt joint of the butt-joint welding is ensured. The supporting shaft assembly 5 can also drive the butt joint supporting assembly 2, the water pipe supporting assembly 3 and the water pipe to be welded defined by the butt joint supporting assembly 2 and the water pipe to be welded to rotate, and the driving force of the supporting shaft assembly 5 is provided by the driving assembly 6. The driving component 6 can also adjust the height and the angle of the water pipe to be welded when the butt joint positioning component 4 is fixed on the inner wall of the second water pipe, so that the two water pipes are further effectively butted.

Preferably, the welder assembly 1 comprises a sliding guide 11, a welding station 12, a moving assembly 13. The sliding guide rail 11 is installed on the outer loop bar 51 of the support shaft assembly 5 in a way that the guide surface of the sliding guide rail is perpendicular to the shaft lever of the support shaft assembly 5, and when the support shaft assembly 5 is arranged in the water delivery pipe to be welded in a penetrating way, the sliding guide rail 11 is positioned at one side close to the end surface to be welded of the water delivery pipe to be welded. The welding table 12 is detachably mounted on an endless track formed by the slide rail 11. The welding table 12 can perform circular motion along the annular track, and the welding table 12 can be positioned at any position of the annular track of the sliding guide rail 11 according to requirements, so that the butt welding seams of the two sections of water pipes positioned on the outer side of the annular track are subjected to positioning welding. The welding station 12 also supports a movement assembly 13 capable of adjusting and controlling the movement of the welding machine 17. The moving assembly 13 can move the welding machine 17 to a set position close to the welding seam, the moving assembly 13 adjusts the distance between the front end of the welding machine 17 and the welding seam according to requirements, and short arc welding or long arc welding is carried out according to requirements. The moving assembly 13 can also drive the welding machine 17 to perform reciprocating swing connection welding on the width direction of the butt joint of the two sections of water conveying pipes. The connection welding is that when multi-layer welding is carried out on a welding seam with a V-shaped section, the following welding seams with wider widths are subjected to translation welding along the width of the welding seam to realize the complete filling of the welding seam between two sections of water delivery pipes. The sliding guide rail 11 with the annular track can ensure that the welding machine 17 can continuously and uninterruptedly complete the welding operation of the whole end face of the water pipe under the condition that welding raw materials such as welding wires and the like are sufficient when the welding table performs the welding operation of the inner ring of the large-size water pipe, and the quality problems such as cold joints generated by secondary welding after midway stopping welding are avoided; in addition, by arranging the moving assembly 13 capable of controlling the working position of the welding machine 17 and driving the welding machine 17 to reciprocate, the welding machine 17 can perform welding operation swinging along the width direction of the gap aiming at the gap with larger space between large-size water conveying pipes, and the possibility of welding defects is effectively avoided.

Preferably, in the case where the welding table 12 is positioned at the endless track set position of the slide rail 11, the moving assembly 13 can be selectively moved in multiple directions on the welding table 12, and the welding machine 17 mounted on the moving assembly 13 can adjust its working position following the movement of the moving assembly 13. After the welding table 12 moves to an area of a gap to be welded along the annular track of the sliding guide rail 11, the moving assembly 13 can adjust the height and the angle of the butt joint gap between the connecting welding machine 17 and the water pipe. The welding machine 17 can be positioned in a plane formed by the annular welding seams and can move in a direction perpendicular to the plane formed by the annular welding seams, so that swinging welding is carried out on a gap with a large width existing in butt joint of large-size water pipes, and the transverse swinging welding operation can effectively connect the end faces of two sections of water pipes together in a welding mode.

As shown in fig. 2, the slide rail 11 includes at least an annular slide rail 111 and a slider 112. Preferably, the sliding block 112 is sleeved on the annular sliding rail 111, and the sliding block 112 can perform a circular motion along the annular sliding rail 111. The sliding block 112 can adjustably move to a preset slide rail position according to requirements, so that the welding machine 17 can weld the water pipe gap area corresponding to the section of slide rail position after moving to the corresponding position. Preferably, the slide block 112 is provided with a blocking member 113 on a surface away from the annular slide rail 111, and the blocking member 113 can be detachably connected with the welding table 12. The locking member 113 may be a conventional locking structure, and is provided with an elastic locking groove for mounting the welding table 12.

Preferably, the welding station 12 includes a platform body 121 and a clamping base 122. Preferably, the length direction of the platform body 121 is parallel to the axial direction of the water duct. The length direction of the platform body 121 is perpendicular to the circumferential surface defined by the slide rails. The clamping base 122 can be selectively clamped with the clamping piece 113, so that the welding table 12 can slide along the annular slide rail 111 of the slide rail 11. The welding table 12 can follow the sliding block 112 to perform circular motion along a sliding rail according to work setting, wherein in the welding process, the welding table 12 and the sliding block 112 can move at a lower speed so as to realize that the welding machine 17 slowly moves along the length direction of a welding seam, and further the continuous welding of the welding seam is ensured, and more cold joints are prevented from being generated in the welding process. Preferably, when the welding table 12 is initially mounted on the slider 112, the slider 112 can move the welding table to the position to be welded at a fast moving speed. Preferably, the surface of the platform body 121 remote from the clamping base 122 is also provided with a moving assembly 13 capable of adjusting the working position of the welding machine 17. The moving assembly 13 can drive the welding machine 17 to perform multi-angle adjustment movement relative to the platform main body 121, so that the welding machine 17 can translate in a set area and/or change the distance between the welding machine 17 and the water delivery pipe butt joint gap.

Preferably, the moving assembly 13 comprises a first moving assembly 14 capable of moving the welder 17 in a first direction, and a second moving assembly 15 moving the welder 17 and the first moving assembly 14 in a second direction. The first direction is the radial direction of the ring formed by the annular slide 111, i.e. the distance between the welder 17 and the area to be welded is adjusted. The second direction is the direction of controlling the welding machine 17 to swing back and forth along the width direction of the welding seam, namely the length direction of the water pipe or the direction perpendicular to the end face of the water pipe. The second moving assembly 15 is mounted on the surface of the platform body 121 remote from the clamping base 122. The first moving assembly 14 is supported on the platform body 121 by the second moving assembly 15 connected thereto. The first moving member 14 can follow the movement of the second moving member 15 to perform the setting direction and distance movement.

As shown in fig. 2, the second moving assembly 15 includes a second moving guide 151, a second moving rail 152, and a second driving unit 153. The second moving rail 151 is mounted on the surface of the table main body 121 by any means capable of fixing it at a set position, for example, bolting or welding. The second moving rail 152 is disposed in the second moving guide 151, and a second driving unit 153 capable of controlling the movement of the second moving rail 152 is connected to one end thereof. Preferably, the moving directions and the length directions of the second moving guide 151 and the second moving guide 152 are parallel to the length direction of the platform main body 121, so that the second moving assembly 15 can control the welding machine 17 to swing back and forth in the width direction of the gap to be welded. Preferably, the second driving unit 153 employs a moving stepping motor, which is disposed at a side of the second moving guide 151 close to the slide rail. Preferably, a fixing plate 154 capable of reciprocating along the length direction of the second moving rail 151 along with it is attached to the second moving rail 152. The surface of the fixed plate 154 remote from the second movable rail 152 supports the first movable assembly 14 connected to the welder 17. The first moving assembly 14 includes a first moving rail 141 supported on the fixed plate 154, a first moving screw 142 installed in the first moving rail 141, and a first driving unit 143 connected to the first moving screw 142. The first driving unit 143 is disposed at an end of the first moving rail 141 remote from the fixed plate 154. The first movable screw 142 can rotate under the driving of the first driving unit 143, and the first movable screw 142 drives the welder mounting part 16 which is rotatably connected to the first movable screw 142 to move up and down. The welder mount 16 is removably attached with a welder 17. Preferably, the welder mount 16 is connected to the welder 17 by a support. The support member is provided with a plurality of mounting holes which enable it to be connected to a welder mount 16, so that a user can adjust the length of the welder 17 extending from the welding station as desired. When the welding device is used, the welding machines 17 with different types and sizes are installed on the installation blocks according to requirements, so that the inner sides of the gaps of the end faces of the two large-size water delivery pipes which are mutually butted are welded.

As shown in fig. 3, the docking support assembly 2 includes a plurality of limit adjustment rods 21 that can be extended or shortened in the radial direction of the support shaft assembly 5, and an adjustment rod driving part 22 that can simultaneously adjust the lengths of the plurality of limit adjustment rods 21. The plane defined by the limit adjusting rods 21 is perpendicular to the axis of the supporting shaft assembly 5, and one end of the limit adjusting rod 21 close to the supporting shaft assembly 5 is connected with the outer loop bar 51 through the adjusting rod driving part 22. The plurality of limit adjusting rods 21 uniformly and circumferentially arranged on the outer sleeve rod 51 of the support shaft assembly 5 can change the size of a limited supporting surface under the driving of the adjusting rod driving part 22, and the size deformation degree and the roundness of the water pipe to be welded can be adjusted by simultaneously acting on a plurality of inner wall points of the same section of the water pipe to be welded, so that the water pipe to be welded can have an end to be welded which tends to a conventional circular end surface, and the end to be welded can be conveniently butted with the end part of a second water pipe, and a circular welding seam which can correspond to each other and has uniform welding seam width can be obtained. Preferably, the rod body of the limit adjusting rod 21 is fixedly connected to the surface of the annular slide rail 111 of the sliding guide rail 11, and the support stability of the limit adjusting rod 21 can be further ensured by stably arranging the annular slide rail 111 on the outer loop bar 51, so that the position of the limit adjusting rod 21 is limited in a manner that the rod body is simultaneously connected with the support shaft assembly 5 and the annular slide rail 111, and the stability between the water pipe to be welded and the device can be kept in the extending support process, thereby effectively avoiding the influence of the weight of the water pipe on the support stability of the limit adjusting rod 21. Through the surface mounting of the limiting adjusting rod 21 on the annular slide rail 111, the annular slide rail 111 can be fixed in the inner cavity of a large-diameter water delivery pipe with more sizes according to actual requirements, and therefore the welding mechanism on the annular slide rail 111 can weld water delivery pipes with different sizes. The limit adjusting rods 21 are arranged in a mode that the intervals are uniform along the ring surface of the annular slide rail 111 and the axis of the rod body is consistent with the radial direction of the ring, so that the limit adjusting rods extending towards multiple directions can effectively support and adjust the outline of the water pipe to be welded.

As shown in fig. 3, the limit adjustment lever 21 includes a first sleeve 211, a second inner rod 212, and a third sleeve 213. The first sleeve 211 is detachably mounted on the sidewall of the annular slide rail 111. The second inner rod 212 is at least sleeved with the first sleeve 211, so that the second inner rod 212 is extended in a direction away from the annular slide rail 111 according to a mode that the rod body of the second inner rod moves out of the first end of the first sleeve 211. The second inner rod 212 is also sleeved with a third sleeve 213. The third sleeve 213 is provided between the first sleeve 211 and the second inner rod 212 so as to be rotatable with respect to the first sleeve 211 and the second inner rod 212. An end of the third sleeve 213 remote from the second inner rod 212 extends from the second end of the first sleeve 211 into the annular region defined by the annular slide rail 111. Preferably, the outer side of the third sleeve 213 is sleeved with the first sleeve 211 through a bearing, so that the first sleeve 211 can always keep a relatively static state during the rotation of the third sleeve 213. Preferably, the inner side of the third sleeve 213 is provided with an internal thread engaged with the second inner rod 212, so that the rotation of the third sleeve 213 can convert the rotation driving of the second inner rod 212 into the parallel movement of the rod body, and further, the relative translation of the second inner rod 212 with respect to the first sleeve 211 is realized to change the length of the limit adjusting rod 21.

Preferably, a limiting member 214 capable of limiting the rotation of the second inner rod 212 is further connected to the rod body extending to the outside of the first end of the first sleeve 211. One end of the limiting member 214 away from the second inner rod 212 is connected to the tube body of the first sleeve 211 in a manner that the second inner rod 212 limited by the limiting member 214 can translate relative to the first sleeve 211. Further preferably, the limiting member 214 is slidably connected to the first sleeve 211 in a manner that it can move along the radial direction of the annular slide rail 111 following the second inner rod 212. The axis of the limit adjusting rod 21 is consistent with the radial direction of the annular slide rail 111. The second inner rod 212 cannot rotate along with the third sleeve 213 by providing the limiting member 214, and only can perform directional translation under the mutual transmission action of the threaded screws. Preferably, a first bevel gear 215 is further connected to an end of the third sleeve 213 away from the second inner rod 212.

Preferably, the driving part 22 includes a driving motor 221, a second bevel gear 222 connected to the driving motor 221, and a housing 223. The second bevel gear 222 is sleeved on the outer sleeve rod 51 through a bearing, so that the second bevel gear 222 can perform relative rotation around the axis of the outer sleeve rod 51 under the action of the driving motor 221. The second bevel gear 222 is engaged with the first bevel gears 215 provided on the plurality of third bushings 213 in such a manner that it can extend the limit adjustment levers 21 provided in the plurality of radial directions of the endless slide rail 111 at the same time. Preferably, the housing 223 can define the meshing state between the first bevel gear 215 and the second bevel gear 222, and can define the relative position of the limit adjusting lever 21 and the outer thimble 51. The housing 223 can also enable the limit adjusting lever 21 and the driving part 22 to follow the outer thimble 51 for translation along the axis of the outer thimble 51. The plurality of limit adjusting rods are driven and adjusted by the same driving unit, so that the limit adjusting rods positioned in the plurality of radial directions of the annular guide rail can be synchronously extended or shortened to the same length, and the oval end surface of the to-be-welded water conveying pipe supported by the limit adjusting rods 21 can be adjusted to be a circular end surface.

As shown in fig. 1, the water duct support assembly 3 includes a first support bar 31, a first hydraulic bar 32, a first support base plate 33, and a first hydraulic base plate 34. The first supporting base plate 33 and the first hydraulic base plate 34 are both detachably sleeved on the outer thimble 51, and the positions of the first supporting base plate 33 and the first hydraulic base plate 34 on the outer thimble 51 can be adjusted according to the actual length of the water pipe to be welded. Preferably, one end of the first support rod 31 is hinged to one end of the first hydraulic rod 32, and the end of the first support rod 31 away from the first hydraulic rod 32 is hinged to the first support base plate 33 mounted on the outer sleeve rod 51; the end of the first hydraulic rod 32 remote from the first support rod 31 is hinged to a first hydraulic base plate 34 mounted on the outer sleeve 51, so that the first support rod 31, the first hydraulic rod 32 and the rod body of the outer sleeve 51 defined in part by the first support base plate 33 and the first hydraulic base plate 34 form a triangle with an adjustable included angle. Preferably, a plurality of first supporting rods 31 are circumferentially arranged on the first supporting base plate 33 with a circular cross section; a plurality of first hydraulic rods 32 are also circumferentially provided on the first hydraulic base plate 34 having a circular cross section. When the pipe body welding device is used, the lengths of the first hydraulic rods 32 are synchronously adjusted to enable the first supporting rods 31 to rotate around the connection points of the first supporting rods and the first supporting base plate 33, so that the size of the supporting surface defined by the first supporting rods 31 is increased, the shape of the cross section of the pipe body at one end, far away from a welding seam, of the water conveying pipe to be welded can be adjusted under the action of the first supporting rods 31, the deformation of the pipe body under the dead weight is corrected, and the roundness of the pipe body is enabled to be within the range of the set threshold value. When the water pipe supporting component 3 is supported on the inner wall of one end of the water pipe to be welded and the butt joint supporting component 2 supports and limits the other end of the water pipe to be welded, which is close to the welding seam, the outer loop bar 51 can drive the butt joint supporting component 2 and the water pipe supporting component 3 to move towards the second water pipe, so that the adjustment of the size of the gap between the two sections of water pipes is realized, and the size of the welding seam is within the set threshold range.

As shown in fig. 1, the butt positioning assembly 4 is provided on an inner shaft 52 where the support shaft assembly 5 passes through the water pipe to be welded and is inserted into the interior of the second water pipe. The butt positioning assembly 4 can define the relative position between the rod body of the inner shaft 52 inserted inside the second water conveying pipe and the second water conveying pipe. Preferably, the second water conveying pipe is a section of water conveying pipe which is sent into the tunnel and one end of which is welded; the to-be-welded water pipe is a water pipe with at least part of pipe bodies fed into the tunnel and two ends of the pipe bodies are not welded, and one end of the to-be-welded water pipe penetrating into the tunnel is subjected to butt welding with the end, not welded, of the second water pipe after position, angle, roundness and deformation are adjusted.

Preferably, the docking positioning assembly 4 includes a second support rod 41, a second hydraulic rod 42, a second support base plate 43, and a second hydraulic base plate 44. The second supporting base disk 43 and the second hydraulic base disk 44 are both detachably sleeved on the inner shaft rod 52, and the positions of the second supporting base disk 43 and the second hydraulic base disk 44 which are installed on the inner shaft rod 52 can be adjusted according to the actual length of the water pipe to be welded. Preferably, one end of the second support rod 41 is hinged to one end of the second hydraulic rod 42, and one end of the second support rod 41 away from the second hydraulic rod 42 is hinged to a second support base disc 43 mounted on the inner shaft 52; the end of the second hydraulic rod 42 away from the second support rod 41 is hinged to a second hydraulic base plate 44 mounted on the inner shaft 52, so that the second support rod 41, the second hydraulic rod 42 and the rod body of the inner shaft 52 defined by the second support base plate 43 and the second hydraulic base plate 44 form a triangle with an adjustable included angle. Preferably, a plurality of second supporting rods 41 are circumferentially arranged on the second supporting base disk 43 with a circular cross section; a plurality of second hydraulic rods 42 are also circumferentially disposed on a second hydraulic base plate 44 having a circular cross-section. During the use, make second bracing piece 41 rotate around its and second support base plate 43 tie point through the length of synchronous adjustment a plurality of second hydraulic rams 42 to increase the size of the holding surface that second bracing piece 41 was injectd, and make the body of the one end of second raceway near the welding seam can adjust its body cross-sectional shape under the effect of second bracing piece 41, revise the deflection of body under the dead weight, make the circularity of body terminal surface be in setting for the threshold value within range.

The support shaft assembly 5 includes an outer spindle 51 and an inner spindle 52. As shown in fig. 1 and 3, the outer rod 51 is sleeved on the inner shaft 52, and the outer rod 51 can rotate relative to the inner shaft 52, and the outer rod 51 can also axially translate relative to the inner shaft 52. Preferably, when the outer rod 51 rotates relative to the inner rod 52, the outer rod 51 can also drive the water pipes to be welded supported and limited by the butt joint support assembly 2 and the water pipe support assembly 3 to synchronously rotate. The water pipe to be welded and/or the second water pipe with slightly irregular end faces to be welded can be adjusted to correspond to another pipe body through rotation of the water pipe to be welded, and the welding seam interval is limited within a threshold range. Preferably, the outer rod 51 is inserted into the front end of the water pipe to be welded and limited by a translation bearing or the like. The other end of the outer rod 51 is connected to a rotary drive unit 61 of the drive assembly 6, so that the outer rod 51 is rotated by the drive of the rotary drive unit 61. Further preferably, the position of the outer rod 51 between the outer rod and the inner shaft 52 is limited by the driving assembly 6 and the translation bearing, so that the outer rod 51 can also move along the axial direction of the inner shaft 52 under the action of the driving assembly 6, and further, the gap between the water pipe to be welded and the second water pipe is adjusted according to requirements, so that the width of the weld seam between the water pipe to be welded and the second water pipe reaches the set threshold range. Preferably, the inner ring surface of the translation bearing is provided with a convex slider. The surface of the inner shaft 52 is provided with a sliding groove which is engaged with the male slider, so that the inner ring defining the translation bearing can only translate in the axial direction of the inner shaft 52.

The drive assembly 6 comprises a rotary drive unit 61, a translational drive unit 62, a bushing 63 and a drive housing 64. Preferably, the rotary drive unit 61, the translational drive unit 62 and the bushing 63 are mounted within the drive housing 64 in a limited manner. The rotary drive unit 61 is engaged with the end of the outer loop bar 51 inserted into the drive housing 64 by the rotating teeth on the rotating shaft thereof, so that the rotation of the rotary drive unit 61 rotates the outer loop bar 51. Preferably, the portion of the shaft where the inner shaft is inserted into the drive housing 64 is also provided with a screw thread which engages the sleeve 63. When the shaft sleeve 63 is sleeved on the inner shaft 52, the shaft sleeve 63 is rotatably connected with the driving housing 64 through a bearing, so that the shaft sleeve can rotate on the inner shaft 52 and further drive the driving assembly 6 to perform parallel movement on the inner shaft 52 while limiting the relative position of the inner shaft 52 and the driving assembly 6, and the driving assembly 6 can drive the outer sleeve 51 to perform relative translation relative to the inner shaft 52. Preferably, the outer gear teeth of the bushing 63 also mesh with the rotating teeth of the translational drive unit 62, so that the bushing 63 is rotated on the inner shaft 52 to be translated by the translational drive unit 62. Through the setting with the drive assembly that the supporting shaft subassembly 5 is connected to can drive the rotation and the translation of waiting to weld the raceway that the cover was established on the supporting shaft subassembly 5. Preferably, the bottom of the driving housing 64 is further provided with a height adjustment lever 65 and a base 66 supporting the driving housing 64. The upper surface of the base 66 is provided with a height adjusting lever 65 vertically connected thereto. The other end and the drive casing 64 of altitude mixture control pole 65 are connected, thereby adjust the height of drive casing according to the length change of altitude mixture control pole 65, and then can adjust the contained angle between the axis of back shaft subassembly and the horizontal plane, make the axis of treating the welding raceway that the cover was established on the back shaft subassembly 5 can coincide each other with the axis of second raceway, guaranteed both can accurate butt joints, the problem of dislocation appears or there is the contained angle when having avoided the butt joint, make the welding seam width size before two sections raceway even, be favorable to subsequent welding operation.

It should be noted that the above-mentioned embodiments are exemplary, and that those skilled in the art, having benefit of the present disclosure, may devise various arrangements that are within the scope of the present disclosure and that fall within the scope of the invention. It should be understood by those skilled in the art that the present specification and figures are illustrative only and are not limiting upon the claims. The scope of the invention is defined by the claims and their equivalents.

Claims (10)

1. The welding device applied to the large water pipe in the tunnel comprises a welding machine assembly (1) capable of welding a butt joint of the water pipe, and is characterized in that the welding machine assembly (1) is adjustably mounted on a support shaft assembly (5), so that when the support shaft assembly (5) is arranged in the water pipe to be welded in a penetrating mode, the welding machine assembly (1) can continuously change the working position along the circumferential direction of the butt joint and/or the axial direction of the water pipe on a preset track, and further the welding of the butt joint is completed uninterruptedly;

the support shaft assembly (5) comprises at least an outer shank (51) and an inner shank (52), wherein,

the outer loop bar (51) drives the water pipe to be welded to move through a butt joint supporting component (2) and a water pipe supporting component (3) which are arranged on the surface of the outer loop bar and can support and limit the water pipe to be welded;

the outer sleeve rod (51) is sleeved on the inner shaft rod (52) in a mode of driving the water pipe to be welded to rotate or translate;

the support shaft assembly (5) can adjust the position of the to-be-welded water pipe, so that the to-be-welded water pipe can be in butt joint with the second water pipe in a dislocation-free mode.

2. The welding device for the large water pipe in the tunnel according to claim 1, wherein the butt joint support assembly (2) is installed on an outer sleeve rod (51) of the support shaft assembly (5) in a circumferentially distributed manner, and a limit adjusting rod (21) of the butt joint support assembly (2) can be extended or shortened along a radial direction of the outer sleeve rod (51), so that one end, away from the outer sleeve rod (51), of the limit adjusting rod (21) is positioned and supported on the inner wall of the water pipe to be welded in a manner that the extended butt joint support assembly (2) can adjust the deformation degree and/or the roundness of the water pipe to be welded;

the rod body of the limit adjusting rod (21) is connected with an annular slide rail (111) of the welding machine assembly (1), so that the limit adjusting rod (21) is supported at one end of a slope surface formed by the water delivery pipe to be welded, and the roundness of the end surface of the water delivery pipe to be welded is corrected.

3. The welding device applied to the large water conveying pipe in the tunnel according to the claim 2, characterized in that the welder assembly (1) comprises at least a sliding guide rail (11), a welding table (12) and a moving assembly (13), wherein,

a moving assembly (13) is supported on the welding table (12), a sliding guide rail (11) is further connected to the surface, away from the moving assembly (13), of the welding table (12), and the welding table (12) is clamped on the annular slide rail (111) of the sliding guide rail (11) in a manner that the welding table can directionally move on the annular slide rail (111); the moving assembly (13) can move circularly on an annular slide rail (111) formed by the sliding guide rail (11) along with the welding table (12);

the sliding guide rail (11) is installed on the outer loop bar (51), and the sliding guide rail (11) is connected with the limit adjusting rod (21) in a mode of providing supporting force for the butt joint supporting assembly (2).

4. The welding device applied to the large water conveying pipe in the tunnel according to claim 3, wherein the butt joint support assembly (2) comprises the limit adjusting rod (21) and an adjusting rod driving part (22), and the limit adjusting rod (21) is driven by the adjusting rod driving part (22) to extend or contract along the radial direction of the outer sleeve rod (51);

spacing regulation pole (21) include at least first sleeve pipe (211), second interior pole (212) and third sleeve pipe (213), wherein, cup joint third sleeve pipe (213) and first sleeve pipe (211) in proper order on second interior pole (212), third sleeve pipe (213) can be for according to it carries out the pivoted mode setting for first sleeve pipe (211) and second interior pole (212) between first sleeve pipe (211) and second interior pole (212), third sleeve pipe (213) are kept away from the one end of second interior pole (212) is followed first sleeve pipe (211) is close to the one end of overcoat pole (51) is worn out.

5. The welding device for the large water pipe in the tunnel according to claim 4, wherein the adjusting rod driving part (22) comprises a driving motor (221), a second bevel gear (222) and a shell (223), the shell (223) is installed on the outer casing rod (51) in a manner of limiting the relative position of the butt joint support assembly (2) and the outer casing rod (51),

one end of the third sleeve (213) close to the outer sleeve rod (51) is inserted into the shell (223), and the third sleeves (213) of the limit adjusting rods (21) arranged in the circumferential direction are meshed with the same second bevel gear (222), so that the limit adjusting rods (21) are synchronously lengthened or shortened.

6. The welding device for the large water pipe in the tunnel according to claim 5, wherein the water pipe support (3) at least comprises a plurality of first support rods (31) and first hydraulic rods (32), wherein one end of each first support rod (31) is movably connected with each first hydraulic rod (32), and both one end of each first support rod (31) far away from the first hydraulic rod (32) and one end of each first hydraulic rod (32) far away from the first support rod (31) are connected to the outer sleeve rod (51);

the outer sleeve rod (51) is limited by the first support rod (31) and the first hydraulic rod (32), and a part of rod body, the first support rod (31) and the first hydraulic rod (32) jointly form a support triangle with an adjustable included angle, so that the first support rod (31) rotates along with the extension or the shortening of the first hydraulic rod (32), and one end, far away from the outer sleeve rod (51), of the first support rod (31) is positioned and supported on the inner wall of the water delivery pipe to be welded.

7. The welding device applied to the large water pipe in the tunnel according to claim 6, wherein the butt joint positioning component (4) at least comprises a plurality of second support rods (41) and a second hydraulic rod (42), wherein one end of each second support rod (41) is movably connected with the second hydraulic rod (42), and both one end of each second support rod (41) far away from the second hydraulic rod (42) and one end of each second hydraulic rod (42) far away from the second support rod (41) are connected to a part of the rod body of the inner rod (52) inserted into the second water pipe;

the inner shaft rod (52) is limited by the second support rod (41) and the second hydraulic rod (42), and a part of rod body, the second support rod (41) and the second hydraulic rod (42) jointly form a support triangle with an adjustable included angle, so that the second support rod (41) rotates along with the extension or the shortening of the second hydraulic rod (42), and one end, far away from the inner shaft rod (52), of the second support rod (41) is positioned and supported on the inner wall of the second water conveying pipe.

8. The welding device applied to the large water conveying pipe in the tunnel according to the claim 7, characterized in that the end of the supporting shaft assembly (5) positioned outside the water conveying pipe to be welded is also connected with a driving assembly (6) capable of adjusting the height and driving the movement of the supporting shaft assembly,

the driving assembly (6) at least comprises a rotary driving unit (61) capable of driving the outer sleeve rod (51) to rotate, a translational driving unit (62) driving the outer sleeve rod (51) to translate relative to the inner shaft rod (52), and a shaft sleeve (63) limiting the relative position of the driving assembly (6) and the inner shaft rod (52).

9. A welding process applied to welding of a large water delivery pipe in a tunnel is characterized by comprising the following steps:

cleaning dirt on the to-be-welded bevel face of two large-size water delivery pipes and polishing;

adjusting the distance between the pipe to be welded and the second pipe body sent into the tunnel, the included angle of the axes, the dimensional deformation degree, the roundness and the like of the two sections of water conveying pipes by using the butt welding device;

adjusting the welding gun assembly to enable the welding gun to be at a relative position with a set distance from the welding seam, driving the welding gun to run on the circular track in a trial mode, checking whether the distance between the welding gun and the welding seam is changed greatly or not,

when the welding gun slides on the annular guide rail and the distance between the welding gun and the welding line is changed beyond the threshold range, the deformation degree and/or the roundness of the water pipe are adjusted by controlling the butt joint supporting component (2), the water pipe supporting component (3), the butt joint positioning component (4) and the supporting shaft component (5) to move;

preparing welding materials and checking whether relevant functional equipment is good or not;

and carrying out multi-layer welding and cleaning in multiple times.

10. The welding and welding process for the large water conveying pipe in the tunnel according to claim 9, wherein the multi-layer welding and cleaning at least comprises the following steps:

s1: tack welding → S2: sanding and cleaning → S3: backing weld → S4: sanding and cleaning → S5: fill weld → S6: sanding and cleaning → S7: cover welding → S8: cleaning the welding head after the welding head is welded,

wherein, the threshold range of the minimum distance between two sections of water pipes is 2-3mm, the thickness of the minimum distance is 2mm, and the angle of the formed V-shaped groove is 60 degrees.

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