An in-pipe welding apparatus and an engineered pipe welding system

Abstract

The application discloses a pipeline internal welding device and an engineering pipeline welding system. The pipeline internal welding device comprises a machine body, a ventilation pipe body and a walking mechanism. The ventilation pipe body penetrates the upper and lower ends of the machine body. The machine body comprises a first working platform and a second working platform arranged in series. The first working platform comprises a first rack, a ring-shaped moving track, at least one welding mechanism and a wind shielding structure. The welding mechanism can move on the moving track. The second working platform comprises a second rack connected with the first rack, and a second material placing table arranged in the second rack and used for carrying personnel and welding operation equipment. The pipeline internal welding device and the engineering pipeline welding system solve the technical problems that the installation and displacement of the moving track are very difficult and time-consuming, and the welding operation area is easily oxidized by the cross draught in the culvert due to poor air protection.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of pipeline welding in construction sites, in particular to a pipeline internal welding device and an engineering pipeline welding system. BACKGROUND

[0002] The upper and lower reservoirs of a pumped storage power station have a large drop and a long horizontal distance, and are connected by a water diversion culvert, with a high-pressure steel pipe lining in the culvert. Due to continuous technological progress, the requirements for the pressure strength grade of the lining pipe are becoming higher and higher, and the diameter and wall thickness are also becoming larger and larger, while the installation and operation space reserved for the culvert and the lining pipe is becoming smaller and smaller. The pipeline is first pre-assembled and lengthened by two 3-meter pipes in a steel pipe factory into a 6-meter sectional pipe, with an epoxy resin lining on the inner wall for corrosion prevention. On site, the gap between the sectional pipe to be installed and the installed sectional pipe is fixed by spot welding, the weld is welded and inspected, the new weld area is anticorrosive, and other work is performed. After every 18-meter steel pipe welding (i.e. 3 sectional pipes), about 0.54m thick concrete is poured between the steel pipe and the bedrock. The lining pipe is installed on site by this cycle of sectional welding, pouring concrete, and installing new sectional pipes. The installation period of the pipeline is long, and welding is a key link that restricts the construction quality and period of the pumped storage power station.

[0003] The traditional welding for water diversion pipeline installation adopts a manual welding process, which has inherent defects such as great influence of welder operation on quality stability, low welding efficiency, and specific safety, technical, and period risks in this working condition. Moreover, due to the extremely poor natural ventilation conditions in the culvert, a large amount of smoke dust is generated by arc welding, the humid environment in the culvert is superimposed on the large heat generated by welding, resulting in high environmental temperature, high humidity, poor working environment, and risks such as burns, heat stroke, and toxic and harmful smoke gas poisoning. At the same time, the aging of the population makes it more and more difficult to recruit manual welders, and it is even more difficult to train high-level manual welders, and there is a risk that the shortage of high-level welders will affect the project period due to the dependence on manual welding.

[0004] With the development of science and technology, traditional manual welding operations are gradually replaced by robot automatic welding operations, which solve the above-mentioned drawbacks of traditional manual welding operations, but the existing automatic welding technology still has the following shortcomings: (1) Since the inner wall of the pipeline has been pre-coated with an epoxy resin anticorrosive layer, any temporary welding method is not allowed to fix the welding track on the pipe wall, so the welding track of the existing automatic welding machine is a simple flexible track, which is mostly fixed on the pipeline in the form of magnetic adsorption or a clamp, resulting in great difficulty and time-consuming in the installation and displacement operation of the welding track; (2) Due to the large drop of the culvert, the high air pressure at the bottom and the low air pressure at the top, the chimney effect causes the natural formation of updraft in the culvert, and the wind speed fluctuates greatly with the weather, and most of the time the wind speed exceeds the welding procedure for gas shielded welding, resulting in oxidation of the welding pool metal due to poor gas protection, which seriously endangers the welding quality. SUMMARY

[0005] The present application aims at the deficiencies in the prior art, and provides a pipeline internal welding device and an engineering pipeline welding system, which solve the technical problems of very difficult and time-consuming installation and displacement of the moving track, and poor gas protection of the welding operation area which is easily oxidized by the through draught in the culvert.

[0006] The technical scheme adopted by the present application is as follows:

[0007] The present application discloses a pipeline internal welding device, which comprises a machine body, a ventilation pipe body arranged in the machine body, and a walking mechanism for driving the machine body to move and fix in the pipeline, the ventilation pipe body penetrates the upper and lower ends of the machine body, and the machine body comprises a first working platform and a second working platform arranged in series; the first working platform comprises a first rack, a ring-shaped moving track arranged on the first rack, at least one welding mechanism for welding the to-be-welded part in the pipeline, and a wind-blocking structure for blocking the upward airflow in the pipeline from entering the welding operation area, and the welding mechanism can move on the moving track; the second working platform comprises a second rack connected with the first rack, and a second material table arranged in the second rack for carrying personnel and welding operation equipment.

[0008] Preferably, the first rack is connected to the upper part of the second rack, the first rack comprises a first circular frame and a first bottom plate arranged on the first circular frame, the wind-blocking structure comprises an annular baffle arranged circumferentially around the first circular frame and a flexible sealing plate connected with the outer end of the annular baffle, and the annular baffle and the flexible sealing plate block the airflow channel between the first rack and the inner wall of the pipeline.

[0009] Preferably, the walking mechanism comprises a traction structure, a support structure, and a moving structure connected with the machine body, the traction structure is used for pulling the machine body to move along the axial direction of the pipeline, the support structure can support and fix the machine body to the inner wall of the pipeline, and the moving structure is in rolling connection with the inner wall of the pipeline and is used for driving the machine body to move in the pipeline in cooperation with the traction structure.

[0010] Preferably, the support structure comprises a brake assembly and a centering assembly, the brake assembly comprises at least three brake pieces in openable and closable connection with the peripheral part of the machine body, the brake pieces have a retracted state away from the pipe wall and an expanded state fixed to the pipe wall, and the centering assembly comprises at least four centering pieces fixedly connected with the peripheral part of the machine body, the centering pieces are arranged opposite to each other, and are arranged in an extension and retraction rod structure, so as to provide a pushing force to push the machine body away from the inner wall of the pipeline when the machine body is close to the inner wall of the pipeline.

[0011] Preferably, the second rack comprises a second circular frame and a plurality of second cross beams connected to the inside of the second circular frame along the radial direction of the second circular frame, and the inside of the first circular frame is connected with a plurality of first cross beams arranged along the radial direction of the first circular frame; the support structure is provided with two groups, wherein the first group of brake assemblies and the centering assemblies are respectively connected and arranged on the upper and lower sides of the first circular frame and the first cross beams, and the second group of brake assemblies and the centering assemblies are respectively connected and arranged on the upper and lower sides of the second circular frame and the second cross beams.

[0012] Preferably, the first rack further comprises a plurality of spaced-apart connecting blocks connected to the upper side of the first circular frame, and the moving track is fixed above the first circular frame through the connecting blocks, and the adjacent connecting blocks, the moving track and the first circular frame form a mounting area one, and the centering pieces of the first group of centering assemblies are arranged in the mounting area one; the second rack further comprises a plurality of second longitudinal beams arranged at intervals between the first circular frame and the second circular frame, and the adjacent second longitudinal beams, the first circular frame and the second circular frame form a mounting area two, and the brake pieces of the first group of brake assemblies and the centering pieces of the second group of centering assemblies are arranged in the mounting area two.

[0013] Preferably, the outer end of the first cross beam is connected with the first circular frame, and the inner end is connected with the ventilation pipe body, and the adjacent first cross beams, the ventilation pipe body and the first circular frame form a bottom plate area one, and the first bottom plate is arranged on the bottom plate area one; the outer end of the second cross beam is connected with the second circular frame, and the inner end is connected with the ventilation pipe body, and the adjacent second cross beams, the ventilation pipe body and the second circular frame form a bottom plate area two, and the second bottom plate is arranged on the bottom plate area two.

[0014] Preferably, the upper end of the ventilation pipe body extends above the first working platform, and the traction structure is connected with the upper end of the ventilation pipe body.

[0015] Preferably, the first rack is arranged with a first material table for carrying personnel and welding operation equipment, and the first material table comprises a material plate one and a material plate two arranged on both sides of the ventilation pipe body respectively; the second material table comprises a material plate three and a material plate four arranged on both sides of the ventilation pipe body respectively, and the material plate one, the material plate two, the material plate three and the material plate four are arranged in parallel with each other.

[0016] The application further discloses an engineering pipeline welding system, which comprises the pipeline internal welding device and pipeline group matching device and weld nondestructive inspection device, wherein the pipeline group matching device is arranged above the first working platform and comprises a group matching support and a third storage table arranged in the group matching support and used for carrying personnel and pipeline group matching operation devices, and the lower part of the group matching support is connected with the upper end of the ventilation pipe body; the weld nondestructive inspection device is arranged below the second working platform and comprises an inspection support and a fourth storage table arranged in the inspection support and used for carrying personnel, weld nondestructive inspection operation devices and / or anticorrosion operation devices, and the upper part of the inspection support is connected with the lower end of the second rack and / or the ventilation pipe body.

[0017] The pipeline internal welding device comprises a machine body, a ventilation pipe body arranged in the machine body and a walking mechanism used for driving the machine body to move and fix in the pipeline, the machine body comprises a first working platform and a second working platform arranged in series, and a ring-shaped moving track is arranged on a first rack of the first working platform, so that the moving track is movable and noncontact with the welded pipeline, and moves with the machine body, therefore, the installation, displacement and adjustment of the moving track are very convenient and fast, the moving track provides a high-efficiency walking movement track for the movement of the welding mechanism in the pipeline, the working hours for installing, displacing and adjusting the moving track on site are greatly saved, the pipeline installation efficiency is high, and the moving track can be arranged as a rigid track, so that the load bearing capacity of the track is high and the stability is high, and the welding requirements of reliable fixation, accurate positioning and fast displacement of the high-precision welding mechanism in the pipeline can be easily met, the first working platform further comprises a wind blocking structure used for blocking the upward airflow in the pipeline from entering the welding operation area, so that a welding micro-environment with gas protection is created, the welding pool metal in the welding operation area is prevented from being oxidized by the upward airflow such as upward draught, and the welding quality is ensured, meanwhile, the ventilation pipe body penetrates through the upper and lower ends of the machine body, can guide the upward airflow such as upward draught to the upper part of the machine body, so that the normal ventilation of the culvert is guided to be smooth while the gas protection effect of the welding pool is ensured, the air quality of the working area is improved, and the second working platform comprises a second storage table arranged in a second rack and used for carrying personnel and welding operation devices, and can also facilitate the on-site remote welding or manual repair welding operation of the workers, and is convenient for storing the welding operation devices such as power distribution and electrical control cabinet, welding power source, operation console and welding material.

[0018] The engineering pipeline welding system disclosed by the application has the beneficial effects of the pipeline inner welding device, and further integrates the pipeline assembling device, the pipeline inner welding device and the weld nondestructive testing device, so that the point welding fixing operation between the next pipeline to be welded and the pipeline being welded can be performed in advance while the welding assembling weld operation is being performed, the pipeline assembling is completed, and the weld nondestructive testing operation and / or the new weld corrosion prevention operation are performed on the last welded new weld, so that the groove assembling, point fixing, welding, nondestructive testing and new weld corrosion prevention operations can be completely performed in parallel, the pipeline installation process is greatly optimized, the pipeline installation efficiency is effectively improved, a large amount of time is saved, and the construction period of the pipeline welding and the entire installation project is greatly shortened. The system replaces a large amount of scaffold erection work and eliminates the high-risk scaffold operation risk. In addition, the pipeline assembling device, the pipeline inner welding device and the weld nondestructive testing device are cooperatively operated, so that the construction site item is standardizedly managed, and the management level of the safe and civilized operation on the site is greatly improved.

[0019] Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will become apparent to those skilled in the art upon examination of the following and / or can be learned by practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0020] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an implementation of the application and together with the description, serve to explain the application. In the drawings:

[0021] Figure 1 A structural schematic view of the pipeline inner welding device and the pipeline according to an embodiment of the application.

[0022] Figure 2 A partial structural schematic view of the pipeline inner welding device according to an embodiment of the application Figure 1 .

[0023] Figure 3 A partial structural schematic view of the pipeline inner welding device according to an embodiment of the application Figure 2 .

[0024] Figure 4 A partial structural schematic view of the pipeline inner welding device according to an embodiment of the application Figure 3 .

[0025] Figure 5 A partial structural schematic view of the pipeline inner welding device according to an embodiment of the application Figure 3 .

[0026] Figure 6 A structural schematic view of the engineering pipeline welding system and the pipeline according to an embodiment of the application. DETAILED DESCRIPTION

[0027] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings of the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application. Based on the described embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort belong to the scope of protection of the present application.

[0028] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0029] In the present application, unless specifically defined and limited otherwise, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the communication between the two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0030] In the present application, unless specifically defined and limited otherwise, the first feature "on" or "under" the second feature can include the first and second features directly contacting, or the first and second features not directly contacting, but contacting through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes the first feature directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes the first feature directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0031] Unless otherwise defined, the technical terms or scientific terms used herein should be understood as the usual meaning understood by those skilled in the art to which the present application belongs. The use of "first", "second" and similar words in the patent application description and claims of the present application does not indicate any order, quantity or importance, but is only used to distinguish different components. Similarly, "one" or "a" and similar words do not indicate a quantity limit, but indicate the existence of at least one.

[0032] As Figure 1As shown, as an embodiment of the present application, a pipeline welding device 100 is disclosed for welding the groove 103 between the to-be-installed sectional pipeline 101 and the installed sectional pipeline 102 in the pipeline, especially in the high-pressure steel pipeline lining in the inclined shaft of the pumped storage power station. The pipeline welding device 100 comprises a machine body 1, a ventilation pipe body 2 arranged in the machine body 1, and a walking mechanism 3 for driving the machine body 1 to move and fix in the pipeline. The machine body 1 comprises a first working platform and a second working platform arranged in series, which means that the first working platform can be arranged vertically or obliquely above or below the second working platform. The first working platform comprises a first rack 11, a ring-shaped moving track 12 arranged on the first rack 11, a welding mechanism 13 for welding the to-be-welded part of the groove 103 in the pipeline, and a wind-blocking structure 14 for blocking the upward airflow such as draught in the pipeline from entering the welding operation area. The welding mechanism 13 can move on the moving track 12, and the ring-shaped moving track 12 is arranged on the first rack 11, so it is movable and non-contact with the welded pipeline, and moves with the machine body 1. Therefore, the installation, displacement, and adjustment of the moving track 12 are very convenient and fast, which provides an efficient walking motion track for the movement of the welding mechanism 13 in the pipeline, greatly saves the working hours for installing, displacing, and adjusting the moving track 12 on site, and improves the efficiency of pipeline installation. The moving track 12 can be set as a rigid track, which has stronger bearing capacity and higher stability than the existing flexible track, and can easily meet the welding requirements of reliable fixation, accurate positioning, and fast displacement of the high-precision welding mechanism 13 in the pipeline. The setting of the wind-blocking structure 14 creates a gas-protected welding microenvironment, which can prevent the welding pool metal in the welding operation area from being oxidized by the upward airflow such as draught, and ensures the welding quality. At the same time, the ventilation pipe body 2 penetrates the upper and lower ends of the machine body 1, can guide the upward airflow such as draught to the upper part of the machine body 1, thereby ensuring that the gas protection effect of the welding pool will not be affected, and also guiding the smooth ventilation of the culvert, improving the air quality of the working area. The second working platform comprises a second rack 16 connected with the first rack 11, a second material table 17 arranged in the second rack 16 for carrying personnel and welding operation equipment, which can also facilitate the on-site remote welding or manual repair welding operations of the workers, and is also convenient for storing various welding operation equipment such as power distribution and electrical control cabinet, welding power supply, control console, and welding materials.In this embodiment, four welding mechanisms 13 are provided to form a welding team that works simultaneously, which greatly improves welding efficiency. Anti-collision devices can be set on each adjacent welding mechanism 13 to prevent collision damage accidents. Of course, in other embodiments, one, two, three, five, six or other numbers of welding mechanisms 13 can be set according to the size of the pipeline on site. Compared with manual welding, welding efficiency can be improved to varying degrees.

[0033] like Figure 2 As shown in Figure 3, in one embodiment of the present invention, the first frame 11 includes a first circular frame 111 and a first base plate 112 arranged on the first circular frame 111. The windbreak structure 14 includes an annular baffle 141 and a flexible sealing plate 142. The annular baffle 141 is arranged circumferentially around the first circular frame 111. The flexible sealing plate 142 is connected to the outer end of the annular baffle 141. It can overlap with the annular baffle 141 or be connected to the outer side wall of the annular baffle 141. The annular baffle 141 and the flexible sealing plate 142 are configured as a ring structure that matches the shape of the circular pipe. The flexible sealing plate 142 is made of flexible materials such as soft rubber or airbags, which has good airtightness. It can effectively block the airflow channel between the first frame 11 and the inner wall of the pipe, block the rising airflow such as through wind from blowing towards the welding pool in the welding operation area, and does not affect the normal movement of the welding equipment 100 in the pipe. The moving track 12 is arranged above the first frame 11, and the windbreak structure 14 is arranged around the periphery of the first circular frame 111. That is, the windbreak structure 14 is arranged at the upwind end of the welding operation area. The distance between the windbreak structure 14 and the bevel to be welded can be set to ≥0.5m, which can ensure a good windproof effect while preventing the huge heat generated during welding from melting the flexible sealing plate 142. The first base plate 112 also has a certain windproof effect, thereby guiding the rising airflow such as through drafts from the ventilation duct 2 to the top of the machine body 1, further preventing the rising airflow such as through drafts from blowing onto the weld pool in the welding operation area, and ensuring welding quality. The first frame 11 is connected to the upper part of the second frame 16. That is, the second frame 16 is isolated from the welding operation area by the windproof structure 14 and the first base plate 112, which can prevent the huge heat generated during the welding process from entering the second frame 16 and prevent the workers or welding equipment on the second platform 17 from working in a high-temperature environment. The working environment is excellent and the safety is high. Of course, in some other embodiments, the first frame 11 can also be connected to the lower part of the second frame 16, which can also facilitate the workers to perform remote welding or manual repair welding on site, or store various welding equipment.

[0034] As an embodiment of the present application, the annular baffle 141 comprises a baffle support and a shielding cover plate arranged on the baffle support, the baffle support comprises an inner ring support, an outer ring support and a plurality of inter-ring cross beams radially connected between the inner ring support and the outer ring support, adjacent inter-ring cross beams and the inner ring support and the outer ring support enclose a cover plate area, and the shielding cover plate is arranged on the cover plate area. The flexible sealing plate 142 is arranged to be enclosed by a plurality of flexible plates, or the inner ring support or the outer ring support can be arranged to be enclosed by a plurality of arc-shaped rods. The combined annular baffle 141 and flexible sealing plate 142 are designed to be divided into a plurality of small-volume structures, which facilitates production, processing and assembly. Of course, in other embodiments, the annular baffle 121 or the flexible sealing plate 142 can also be arranged as an integral structure, which can also achieve the shielding effect.

[0035] As shown in Figure 3 As an embodiment of the present application, the walking mechanism 3 comprises a traction structure 31 connected to the machine body 1, a support structure 32 and a moving structure 33. The traction structure 31 serves as a power source for the walking of the machine body 1 and is used to pull the machine body 1 to move axially along the pipeline. In the present embodiment, the traction structure 31 comprises a winch (not shown in the figure) arranged outside the pipeline and a steel wire rope connected between the winch and the machine body 1. The winch drives the steel wire rope to pull the machine body 1 to move axially along the pipeline. The structure is simple, occupies less space in the pipeline, and is convenient for on-site construction. Of course, in other embodiments, the traction structure 31 can also be arranged as a track or other traction device that can be used to pull the machine body 1 to move axially along the pipeline. The support structure 32 can support and fix the machine body 1 to the inner wall of the pipeline, so as to fix the relative position between the machine body 1 and the inner wall of the pipeline, and facilitate the stable performance of the welding operation. The moving structure 33 is rollingly connected to the inner wall of the pipeline and comprises a rolling support connected to the machine body 1 and a roller connected to the rolling support. The outer end of the rolling support is provided with a rolling groove arranged axially along the machine body 1, and the roller is installed in the rolling groove and can only move in the axial direction of the machine body 1. The roller is used to cooperate with the traction structure 31 to drive the machine body 1 to move axially in the pipeline, so as to prevent the machine body 1 from moving circumferentially relative to the pipeline, thereby ensuring the stability of the machine body 1 during movement in the pipeline, and facilitating the welding operation of the high-precision welding mechanism 13 or the worker and the stable walking. The moving structure 33 is rollingly connected to the inner wall of the pipeline, which reduces the friction between the machine body 1 and the inner wall of the pipeline, and facilitates the easy movement of the machine body 1 relative to the pipeline. Of course, in other embodiments, the roller can also be arranged as a universal roller, so that the machine body 1 can move axially and circumferentially relative to the pipeline, and can also cooperate with the traction structure 31 to drive the machine body 1 to move in the pipeline.

[0036] As shown in Figure 3As shown in FIG. 4, as an embodiment of the present application, the support structure 32 comprises a brake assembly and a centering assembly, the brake assembly comprises three brake pieces 321 which are connected to the circumference of the body 1 in an openable and closable manner, the brake piece 321 has a retracted state in which the brake piece 321 is away from the pipe wall and an expanded state in which the brake piece 321 is supported to be fixed to the pipe wall, when the brake piece 321 is in the retracted state, the body 1 can move freely relative to the pipe, when the brake piece 321 is in the expanded state, the body 1 is fixed relative to the pipe, and high-precision welding work can be performed, the three brake pieces 321 are uniformly and evenly spaced, that is, the included angle between any two brake pieces 321 is 120°, the brake has good stability and strong load-bearing capacity, of course, in other embodiments, the brake piece 321 can also be provided as four, five or even more to improve the stability and load-bearing capacity of the brake. The brake piece 321 comprises a brake frame 3211 and a brake plate 3212, the upper part of the inner end of the brake frame 3211 is rotatably connected to the first position of the circumference of the body 1 through a connecting frame, the lower part of the inner end of the brake frame 3211 is telescopically connected to the second position of the circumference of the body 1 through a hydraulic telescopic rod 3213, the inner end of the brake frame 3211 and the first position and the second position form a deformable triangular area, the brake piece 321 can be adjusted to be in the expanded state or the retracted state through the hydraulic telescopic rod, the outer end of the brake frame 3211 is rotatably connected to the brake plate 3212, which facilitates the brake plate 3212 to be kept in contact with the inner wall of the pipe for a long time during the change of the angle of the brake piece 321 between the expanded state and the retracted state, buffers the inertia during braking and starting, and ensures the stable movement of the body 1, the outer end surface of the brake plate 3212 is provided with a flexible structure such as rubber or sponge to increase the friction between the brake plate 3212 and the inner wall of the pipe and ensure the stability of the brake fixation, the brake frame 3211 is provided in a right triangle structure, two right angle sides are respectively located at the inner end and the upper end thereof, when the brake piece 321 is in the expanded state, the hypotenuse is arranged perpendicularly to the inner wall of the pipe, and the upper end is arranged obliquely upward relative to the inner wall of the pipe, so as to enhance the stability and load-bearing capacity of the brake piece 321.

[0037] As an embodiment of the present application, the centering assembly comprises four centering pieces 322 fixedly connected with the peripheral portion of the body 1, the centering pieces 322 are arranged opposite to each other, and are provided in the telescopic rod structure. In the embodiment, the centering pieces 322 can be provided as hydraulic jacks, and the elastic telescopic effect can be achieved through the hydraulic structure, which is convenient for regulation and control. In other embodiments, a spring or other elastic structure can also be provided to achieve the elastic telescopic effect. When the centering piece is located at the corresponding position of the body close to the inner wall of the pipeline, a pushing force pushing it away from the inner wall of the pipeline can be provided, so that the center axis of the body 1 and the center axis of the pipeline are always in the same straight line at any time, and the body 1 is kept in the central position of the pipeline. At the same time, the centering piece 322 also has a retracted state of moving away from the pipe wall and an expanded state of being supported to be fixed to the pipe wall. When the centering piece 322 is in the retracted state, the body 1 can move freely relative to the pipeline, and when the centering piece 322 is in the expanded state, the body 1 is fixed relative to the pipeline, and high-precision welding work can be carried out, thereby further improving the stability of the body 1 fixed relative to the pipeline, and being more conducive to high-precision welding work. The centering pieces 322 are arranged opposite to each other, and are arranged along the radial direction of the body 1, which can adjust the body 1 to be in the central position of the pipeline in two opposite directions, which is convenient for adjustment. The four centering pieces 322 are uniformly and spacedly arranged, that is, the included angle between two centering pieces 322 is 90°, which is convenient for assembly and adjustment from four directions. Of course, in other embodiments, the centering pieces 322 can be provided as five, six or even more, so as to adjust the body 1 to be in the central position of the pipeline from more directions. The centering piece 322 comprises a centering telescopic rod 3221 and a centering plate 3222. The centering telescopic rod 3221 comprises a telescopic outer rod and a telescopic inner rod telescopically connected. The free end of the telescopic outer rod is fixedly connected with the peripheral portion of the body 1. The relative elongation of the telescopic outer rod and the telescopic inner rod in the expanded state or the relative shortening of the telescopic outer rod and the telescopic inner rod in the retracted state can be regulated and controlled through the hydraulic structure inside the centering telescopic rod 3221. The free end of the telescopic inner rod is ball-hinged with the centering plate 3222, which is convenient for the centering plate 3222 to always keep the state of being in close contact with the inner wall of the pipeline when the centering piece 322 supports the inner wall of the pipeline at different angles. The outer end face of the centering plate 3222 is provided with a flexible structure such as rubber or sponge, so as to increase the friction between the centering plate 3222 and the inner wall of the pipeline, and to ensure the stability of the support contact.

[0038] As Figure 3As shown, as an embodiment of the present application, the second rack 16 comprises a second circular frame 161 and a plurality of second cross beams 163 connected to the inner side of the second circular frame 161 along the radial direction of the second circular frame 161, and the inner side of the first circular frame 111 is connected with a plurality of first cross beams 113 arranged along the radial direction of the first circular frame 111, and the arrangement of the first cross beams 113 and the second cross beams 163 enhances the stability and load-bearing capacity of the structure of the first circular frame 111 and the second circular frame 161. The support structure 32 is provided with two groups, wherein the first group of brake assemblies and centering assemblies are respectively connected and arranged on the upper and lower sides of the first circular frame 111 and the first cross beams 113, and the second group of brake assemblies and centering assemblies are respectively connected and arranged on the upper and lower sides of the second circular frame 161 and the second cross beams 163, so that the support and fixation of the machine body 1 in the pipeline are more stable and balanced, and more conducive to the requirements of high-precision welding operation. The brake assemblies and the centering assemblies are connected with the first circular frame 111 and the first cross beams 113 at the same time or connected with the second circular frame 161 and the second cross beams 163 at the same time, and the stability of the connection is good, so that the support of the brake assemblies and the centering assemblies to the machine body 1 is more stable, and the brake assemblies and the centering assemblies are directly supported on the first circular frame 111 and the first cross beams 113, or the second circular frame 161 and the second cross beams 163, so that the support of the moving track 12, the welding mechanism 13, the wind shielding structure 14 and the second storage table 17 is more direct and powerful, and the stability of the support is better.

[0039] As an embodiment of the present application, the first rack 11 further comprises a plurality of spaced-apart connecting blocks 114 connected to the upper side of the first circular frame 111, and the moving track 12 is fixed above the first circular frame 111 through the connecting blocks 114. In this embodiment, the moving track 12 is arranged on the outer periphery directly above the first circular frame 111, which is relatively closer to the inner wall of the pipeline, facilitating the welding mechanism 13 to stably and powerfully perform welding operation. Of course, in other embodiments, the moving track 12 can also be arranged on the outer periphery or the inner periphery directly above the first circular frame 111, which can also be used for the welding mechanism 13 to move along it to perform welding operation on the to-be-welded part in the pipeline. The adjacent connecting blocks 114, the moving track 12 and the first circular frame 111 enclose a mounting area one, and the centering piece 322 of the first group of centering assemblies is arranged in the mounting area one, and at the same time the moving track 12 is erected to a certain height from the first circular frame 111 through the connecting blocks 114, so as to be spaced apart from the wind shielding structure 14 on the outer periphery of the first circular frame 111, forming a better wind shielding effect and preventing the wind shielding structure 14 from being melted by the high-temperature welding environment, and the structure design is ingenious and compact.

[0040] As an embodiment of the present application, the second frame 16 further comprises a plurality of second spaced longitudinal beams 164 connected between the first circular frame 111 and the second circular frame 161, which strengthen the stability of the first circular frame 111 and the second circular frame 161 and enhance the load bearing capacity thereof. In this embodiment, the first circular frame 111 and the second circular frame 161 have the same radius, so that the first frame 11 and the second frame 16 as a whole form a cylindrical structure matching the shape of the inside of the pipeline, which facilitates walking in the pipeline. Of course, in other embodiments, the first circular frame 111 and the second circular frame 161 can also have different radii, and the vehicle can still walk in the pipeline. The second longitudinal beams 164 arranged adjacently together with the first circular frame 111 and the second circular frame 161 enclose a second mounting area, in which the brake members 321 of the first set of brake assemblies and the centering members 322 of the second set of centering assemblies are arranged. The brake members 321 of the second set of brake assemblies are arranged on the underside of the second circular frame 161 and the second transverse beam 163. Of course, in other embodiments, the brake members 321 of the first set of brake assemblies can be arranged in the first mounting area, the centering members 322 of the first set of centering assemblies can be arranged in the second mounting area, or the brake members 321 of the second set of brake assemblies can be arranged in the second mounting area, and the centering members 322 of the second set of centering assemblies can be arranged on the underside of the second circular frame 161 and the second transverse beam 163, which can also achieve the effect of braking and centering of the vehicle 1.

[0041] As Figure 3As shown, as an embodiment of the present application, the outer end of the first cross beam 113 is connected with the first circular frame 111, and the inner end is connected with the ventilation pipe body 2. The first cross beams 113 arranged adjacently enclose the bottom plate area I between the ventilation pipe body 2 and the first circular frame 111. The first bottom plate 112 is arranged on the bottom plate area I. The outer end of the second cross beam 163 is connected with the second circular frame 161, and the inner end is connected with the ventilation pipe body 2. The second cross beams 163 arranged adjacently enclose the bottom plate area II between the ventilation pipe body 2 and the second circular frame 161. The second bottom plate 162 is arranged on the bottom plate area II. The second bottom plate 162 has a certain wind shielding effect, and can also guide the updraft such as the through draught to rise from the ventilation pipe body 2 to above the machine body 1, improve the air quality of the working area, and reduce the through draught blowing into the second rack 16 to affect the work of the workers or various welding operation devices. The first bottom plate 112 and the second bottom plate 162 are arranged in a plurality of shapes matched with the corresponding bottom plate area I or bottom plate area II. Compared with arranging only one integral first bottom plate 112 or second bottom plate 162, the processing and production are facilitated, and the design is more flexible. Different shapes and sizes of the first bottom plate 112 or the second bottom plate 162 can be arranged according to different needs. The ventilation pipe body 2 is arranged on the central axis of the first circular frame 111 and the second circular frame 161 in a cylindrical structure with a diameter of about 0.8 m. On the one hand, it serves as a structure for improving the rigidity of the machine body 1, and on the other hand, it can guide the smooth ventilation of the culvert and guide the updraft such as the through draught to a relatively far area of the welding operation area, so as to ensure that the gas protection effect of the welding pool in the welding operation area is not affected.

[0042] As shown in the drawings, Figure 1 As an embodiment of the present application, the upper end of the ventilation pipe body 2 extends above the first working platform, so that the updraft such as the through draught can be guided to a farther area of the welding operation area, and the gas protection effect of the welding pool in the welding operation area is further ensured. The traction structure 31 is connected with the upper end of the ventilation pipe body 2, and the connection is convenient. The lower end of the ventilation pipe body 2 extends below the second working platform, so that the connection between the second rack 16 and the ventilation pipe body 2 is more reliable. Of course, in other embodiments, the upper end of the ventilation pipe body 2 can be arranged flush with the upper end surface of the first rack 11 or the upper end surface of the first rack 11 and the upper end surface of the ventilation pipe body 2 can be connected, or the lower end of the ventilation pipe body 2 can be arranged flush with the lower end surface of the second rack 16 or the lower end surface of the second rack 16 and the lower end surface of the ventilation pipe body 2 can be connected. In this way, the ventilation pipe body 2 can serve as a rigid structure of the machine body 1 while having the function of ventilation and drainage.

[0043] As shown in the drawings, Figure 5As shown, as an embodiment of the present application, the first rack 11 is arranged with a first shelf 15 for carrying personnel and welding operation equipment, facilitating the workers to carry out repair welding and other work, the first shelf 15 includes a first shelf plate 151 and a second shelf plate 152 arranged on both sides of the ventilation pipe body 2 respectively, the second shelf 17 includes a third shelf plate 171 and a fourth shelf plate 172 arranged on both sides of the ventilation pipe body 2 respectively, and the first shelf plate 151, the second shelf plate 152, the third shelf plate 171 and the fourth shelf plate 172 are arranged in parallel with each other. The first shelf 15 is arranged on the upper side of the first bottom plate 112 and the first cross beam 113, and the second shelf 17 is arranged on the upper side of the second bottom plate 162 and the second cross beam 163. The first shelf plate 151, the second shelf plate 152, the third shelf plate 171 and the fourth shelf plate 172 are arranged in parallel with the ground level, facilitating stable carrying of personnel and welding operation equipment. In this embodiment, the first shelf 15 further includes a first support plate 153, one end of the first shelf plate 151 is connected to a position away from the ventilation pipe body 2 on the upper side of the first bottom plate 112 and the first cross beam 113, the other end is inclined upward to a position at a certain height from the first bottom plate 112 and the first cross beam 113 and close to the ventilation pipe body 2, and is connected to one end of the first support plate 153, the other end of the first support plate 153 is connected to the upper side of the first bottom plate 112 and the first cross beam 113, so that the first shelf plate 151, the first bottom plate 112 and the first cross beam 113, and the first support plate 153 form a triangular support structure; one end of the second shelf plate 152 is connected to a position close to the ventilation pipe body 2 on the upper side of the first bottom plate 112 and the first cross beam 113, the other end is inclined upward to a position at a certain height from the first bottom plate 112 and the first cross beam 113 and is connected to a fence arranged on the first rack 11, so that the second shelf plate 152, the first bottom plate 112 and the first cross beam 113, and the fence form a triangular support structure; the second shelf 17 further includes a second support plate 173, one end of the third shelf plate 171 is connected to a position away from the ventilation pipe body 2 on the upper side of the second bottom plate 162 and the second cross beam 163, the other end is inclined upward to a position at a certain height from the second bottom plate 162 and the second cross beam 163 and close to the ventilation pipe body 2, and is connected to one end of the second support plate 173, the other end of the second support plate 173 is connected to the upper side of the second bottom plate 162 and the second cross beam 163, so that the third shelf plate 171, the second bottom plate 162 and the second cross beam 163, and the second support plate 173 form a triangular support structure; one end of the fourth shelf plate 172 is connected to a position close to the ventilation pipe body 2 on the upper side of the second bottom plate 162 and the second cross beam 163, the other end is inclined upward to a position at a certain height from the second bottom plate 162 and the second cross beam 163 and is connected to the second longitudinal beam 164, so that the fourth shelf plate 172, the second bottom plate 162 and the second cross beam 163, and the second longitudinal beam 164 form a triangular support structure.The included angle between the storage plate one 151, the storage plate two 152, the storage plate three 171, the storage plate four 172 and the ventilation pipe body 2 can be 45°-86°, especially 55°-60°, and particularly 58°, so that it is suitable for the welding operation of the 45°-86°, especially 55°-60°, and particularly 58° inclined shaft pipe installation engineering, can guarantee the stable bearing of personnel and welding operation equipment while the welding mechanism 13 on the moving track 12 performs all-position welding operation on the inside of the inclined shaft pipe, and because the moving track 12 is rigid and is installed on the machine body 1, even if the moving track 12 and the welding mechanism 13 are arranged at an included angle of 58° with the ground level or other included angles within the range of 45°-86°, the welding operation requirements of reliable fixation, precise positioning and rapid displacement of the moving track 12 and the welding mechanism 13 in the pipe can be met, and the practicability is extremely strong. Of course, the specific included angle is determined according to the inclination angle of the pipe at the construction site. The moving structure 33 is arranged on the lower side of the machine body 1, which facilitates the movement of the machine body 1 in the pipe, and the moving structure 33 is provided with two groups, each group is provided with two rolling supports and rollers connected to the rolling supports, wherein the two rolling supports and the rollers of the first group are respectively connected to the two second longitudinal beams 164 on the lower side near the first circular frame 111, and the two rolling supports and the rollers of the second group are arranged on the second circular frame 161, and each rolling support and roller is arranged along the radial direction of the ventilation pipe body 2. Of course, the storage plate one 151, the storage plate two 152, the storage plate three 171 or the storage plate four 172 can also be arranged as a structure that can adjust the inclination angle, so that the included angle between it and the ventilation pipe body 2 can be adjusted and configured according to the inclination angle of the pipe at the construction site, and it is suitable for inclined shaft pipes with various inclination angles. In other embodiments, the storage plate one 151, the storage plate two 152, the storage plate three 171 or the storage plate four 172 can also be arranged perpendicular or substantially perpendicular to the ventilation pipe body 2, so that it is suitable for flat shaft pipes.

[0044] As Figure 6As another embodiment of the present application, an engineering pipeline welding system is also disclosed, which comprises the pipeline internal welding device 100 disclosed in the previous embodiment, and further comprises a pipeline set-up device 200 and a weld non-destructive inspection device 300. The pipeline set-up device 200 is arranged above the first working platform and comprises a set-up support 4 and a third storage table 5 arranged in the set-up support 4 for carrying personnel and pipeline set-up operation devices. The lower part of the set-up support 4 is connected with the upper end of the ventilation pipe body 2. The weld non-destructive inspection device 300 is arranged below the second working platform and comprises an inspection support 6 and a fourth storage table 7 arranged in the inspection support 6 for carrying personnel and weld non-destructive inspection operation devices. The fourth storage table 7 can also be used for carrying anti-corrosion operation devices. The upper part of the inspection support 6 is connected with the lower end of the second rack 16. Of course, in other embodiments, the inspection support 6 can also be connected with the ventilation pipe body 2 or both the second rack 16 and the ventilation pipe body 2 to enhance the stability of the connection. The first staircase and the first passage are arranged between the first rack 11 and the second rack 16. The second staircase and the second passage are arranged between the third storage table 5 and the first rack 11. The third staircase and the third passage are arranged between the fourth storage table 7 and the second rack 16 to facilitate the walking of the workers between the storage tables. In addition to the beneficial effects of the pipeline internal welding device of the previous embodiment, the engineering pipeline welding system disclosed in the present embodiment integrates the pipeline set-up device 200, the pipeline internal welding device 100 and the weld non-destructive inspection device 300, which can perform the spot welding fixation operation between the next set of pipelines to be welded and the set of pipelines being welded to complete the set-up of the set of pipelines, and perform the weld non-destructive inspection and anti-corrosion operation on the new weld, so that the groove set-up, spot fixation, welding, non-destructive inspection and anti-corrosion operation on the new weld can be performed in parallel, forming an integrated system of engineering pipeline set-up, welding, non-destructive inspection and anti-corrosion, which greatly optimizes the process of on-site pipeline installation, effectively improves the work efficiency of pipeline installation, saves a large amount of time and greatly shortens the construction period of pipeline welding and the entire installation project. At the same time, the collaborative operation of the pipeline set-up device, the pipeline internal welding device and the weld non-destructive inspection device also enables the standardized management of items on the construction site, greatly improving the management level of safe and civilized operation on site. In addition, the first storage table, the second storage table, the third storage table and the fourth storage table adopt platform-type independent support structures, which eliminates the high-risk scaffold operation risk in traditional pipeline set-up, welding, post-weld non-destructive inspection and post-weld anti-corrosion operations, and has better stability and higher safety as a personnel working platform. The platform-type independent support structures replace a large amount of scaffold construction and transportation work, greatly saving the workload and time of pipeline set-up, welding, post-weld non-destructive inspection and post-weld anti-corrosion operations, avoiding the situation of work stoppage caused by mutual interference between processes, and ensuring the progress and efficiency of pipeline installation.

[0045] Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can still be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

[0046] In summary, the above only describes the preferred embodiments of the present application, and any equivalent changes and modifications made within the scope of the patent application of the present application shall be covered by the scope of the present application.

Claims

1. A pipeline welding device characterized in that: it comprises a machine body, a ventilation pipe body arranged in the machine body and a walking mechanism for driving the machine body to move and fix in the pipeline, the ventilation pipe body penetrates the upper and lower ends of the machine body, and the machine body comprises a first working platform and a second working platform arranged in series; the first working platform comprises a first frame, a ring-shaped moving track arranged on the first frame, at least one welding mechanism for welding work on a welding site in the pipeline, and a wind blocking structure for blocking the upward airflow in the pipeline from entering the welding work area, and the welding mechanism can move on the moving track; the second working platform comprises a second frame connected with the first frame and a second material table arranged in the second frame for carrying personnel and welding operation equipment; the first frame comprises a first circular frame and a first bottom plate arranged on the first circular frame, the wind blocking structure comprises a ring-shaped baffle arranged circumferentially around the first circular frame and a flexible sealing plate connected with the outer end of the ring-shaped baffle, and the ring-shaped baffle and the flexible sealing plate block the airflow passage between the first frame and the inner wall of the pipeline; the ventilation pipe body is arranged on the central axis of the first circular frame, the upper end of the ventilation pipe body extends above the first working platform, and the lower end of the ventilation pipe body extends below the second working platform; the walking mechanism comprises a traction structure connected with the upper end of the ventilation pipe body, and the traction structure is used to drive the machine body to move along the axial direction of the pipeline; the inner side of the first circular frame is connected with a plurality of first cross beams arranged radially along the first circular frame; the outer end of the first cross beam is connected with the first circular frame, and the inner end is connected with the ventilation pipe body; the first cross beams arranged adjacently enclose the bottom plate area I between the ventilation pipe body and the first circular frame, and the first bottom plate is arranged on the bottom plate area I; the second frame comprises a second circular frame and a plurality of second cross beams connected to the inner side of the second circular frame along the radial direction of the second circular frame; the outer end of the second cross beam is connected with the second circular frame, and the inner end is connected with the ventilation pipe body; the second cross beams arranged adjacently enclose the bottom plate area II between the ventilation pipe body and the second circular frame, and the second bottom plate is arranged on the bottom plate area II. The first frame is connected to the upper part of the second frame. The walking mechanism comprises a support structure connected with the machine body and a moving structure, the support structure can support and fix the machine body to the inner wall of the pipeline, and the moving structure is rollingly connected with the inner wall of the pipeline and is used to drive the machine body to move in the pipeline in cooperation with the traction structure. The support structure comprises a brake assembly and a centering assembly, the brake assembly comprises at least three brake pieces that can be opened and closed with the peripheral part of the machine body, the brake pieces have a retracted state away from the pipe wall and an expanded state supported and fixed to the pipe wall; the centering assembly comprises at least four centering pieces fixedly connected with the peripheral part of the machine body, the centering pieces are arranged opposite to each other, and are provided as telescopic rod structures, which can provide a pushing force to push the machine body away from the inner wall of the pipeline when the centering pieces are close to the inner wall of the pipeline. ​ ​ 2. The in-line pipe welding apparatus of claim 1, wherein: ​ 3. The in-line welding apparatus of claim 2, wherein: ​ 4. The in-line welding apparatus of claim 3, wherein: ​ 5. The in-line welding apparatus of claim 4, wherein: The support structure is provided with two groups, wherein the first group of brake assemblies and centering assemblies are respectively connected to the upper and lower sides of the first circular frame and the first cross beam, and the second group of brake assemblies and centering assemblies are respectively connected to the upper and lower sides of the second circular frame and the second cross beam.

6. The in-line welding apparatus of claim 5, wherein: The first rack further comprises a plurality of spaced-apart connecting blocks connected to the upper side of the first circular frame, and the moving track is fixed above the first circular frame through the connecting blocks, and the adjacent connecting blocks, the moving track and the first circular frame form an installation area one, and the centering pieces of the first group of centering assemblies are arranged in the installation area one. The second rack further comprises a plurality of spaced-apart second longitudinal beams connected between the first circular frame and the second circular frame, and the adjacent second longitudinal beams, the first circular frame and the second circular frame form an installation area two, and the brake pieces of the first group of brake assemblies and the centering pieces of the second group of centering assemblies are arranged in the installation area two.

7. The in-line welding apparatus of claim 6, wherein: The first rack is arranged with a first workbench for carrying personnel and welding operation equipment, and the first workbench comprises a workbench plate one and a workbench plate two arranged on both sides of the ventilation pipe body respectively; the second workbench comprises a workbench plate three and a workbench plate four arranged on both sides of the ventilation pipe body respectively, and the workbench plate one, the workbench plate two, the workbench plate three and the workbench plate four are arranged in parallel with each other.

8. An engineered pipe welding system characterized by, Comprise: The pipe welding equipment according to any one of claims 1-7; A pipe assembling device arranged above the first workbench, comprising an assembling support and a third workbench arranged in the assembling support for carrying personnel and pipe assembling operation equipment, and the lower part of the assembling support is connected to the upper end of the ventilation pipe body; A weld non-destructive testing device arranged below the second workbench, comprising a testing support and a fourth workbench arranged in the testing support for carrying personnel and weld non-destructive testing operation equipment and / or corrosion prevention operation equipment, and the upper part of the testing support is connected to the lower end of the second rack and / or the ventilation pipe body.

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