CN109807516B

CN109807516B - Back protection device for multi-section continuous welding pipeline

Info

Publication number: CN109807516B
Application number: CN201910190059.4A
Authority: CN
Inventors: 姚宗湘; 江山; 左存果; 王刚; 尹立孟
Original assignee: Chongqing University of Science and Technology
Current assignee: Chongqing University of Science and Technology
Priority date: 2019-03-13
Filing date: 2019-03-13
Publication date: 2020-09-04
Anticipated expiration: 2039-03-13
Also published as: CN109807516A

Abstract

The invention discloses a multi-section continuous welding pipeline back protection device, relates to the technical field of pipeline welding, and provides the multi-section continuous welding pipeline back protection device which can be adapted to various pipeline specifications and is simple to operate. The outer wall of the spiral pipe is provided with external threads, the number of the blocking assemblies is at least two, the blocking assemblies comprise a first sleeve ring and a second sleeve ring which are matched with the inner wall of the pipeline, the first sleeve ring and the second sleeve ring are spirally connected onto the spiral pipe through sleeve holes, annular grooves are formed in the first sleeve ring and the second sleeve ring, and blocking air bags are arranged in the annular grooves; stop gasbag itself and have elasticity, can be according to the expanded range of the pipeline internal diameter adjustment of different specifications to the protection of the welding back of the multiple pipeline specification of adaptation, a plurality of subassemblies that stop through threaded connection on the spiral pipe can carry out the continuous welding to a plurality of crater positions of one section pipeline, and easy operation is convenient, has greatly reduced intensity of labour.

Description

Back protection device for multi-section continuous welding pipeline

Technical Field

The invention relates to the technical field of pipeline welding, in particular to a multi-section continuous welding pipeline back protection device.

Background

In addition to the need for proper protection of the high temperature weld pool on the front side of the weld during pipe welding, the back side of the weld must also take the necessary measures to block the oxidizing effect of oxygen in the air on the weld. If no welding seam protection measures are taken, the welding seam metal on the back side is easily oxidized in the welding process, alloy elements are burnt, welding defects are easily generated, and the mechanical property and the corrosion resistance of the welding seam metal are reduced. Inert gases are generally considered to be a good protective medium, and devices that can be used to implement gas shielding of the backside of a weld are known in the industry as "backside shields". In the existing pipeline welding process, an integral argon filling method is generally adopted, two ends of a pipeline are sealed, inert gas is filled for protection, the oxygen content in the pipeline is reduced, and therefore the oxidation degree is reduced. When the small-diameter pipeline or the pipe fitting assembly is short, the whole argon filling can be adopted, and the method is simple. However, when the large-diameter pipeline or pipe fitting assembly is long, the whole argon filling is adopted, so that the defect that the consumption of inert gas is large, and the production cost is high; the inflation time is long, so that the production efficiency is low; and because the space in the pipeline or the gas tank is large, even if a large amount of inert gas is filled, the air can not be effectively emptied, the protection effect is very poor, the welding quality is seriously influenced, the welding seam needs to be polished or passivated by acid cleaning after welding, and a large amount of manpower and material resources are wasted.

Patent CN201620972770.7 discloses a stainless steel pipeline welding back protection device, which comprises a blocking component and an inflation tube, wherein the blocking component and the stainless steel tube form an accommodating cavity, the blocking component is connected with the inflation tube, so as to inflate the accommodating cavity, the weld quality is effectively ensured, and the usage amount of argon is greatly saved, the accommodating cavity formed between the device and the stainless steel tube is sealed by the front end baffle and the rear end baffle which are attached to the tube wall, the front end baffle and the rear end baffle are made of fluororubber, the size of the fluororubber is made according to the corresponding inner diameter of the tube, therefore, the specific size of the fluororubber of the device can only adapt to the back protection of one inner diameter of the tube, if the back protection needs to be improved for different specifications of tubes, the protection devices with different baffle sizes need to be replaced, the back protection devices with different specifications and different sizes need to be prepared in advance, and the manufacturing cost is greatly increased, the applicability of the device is poor, in addition, the fluororubber needs to form a sealing state with the pipe wall, and the outer diameter of the fluororubber is usually slightly larger than the inner diameter of the pipe wall during manufacturing and processing, so that the back protection device needs to be pulled forcefully to reach the position of a weld opening during installation in a pipeline, and the blockage phenomenon is likely to occur in the pipeline if the size processing error of the fluororubber is too large.

In addition, the conventional back protection device can only protect one weld crater position generally, if a plurality of weld crater positions exist in one section of pipeline, the back protection device can only be moved again to the next weld crater position for secondary inflation welding after inflation protection welding of one weld crater position is finished, and the operation is repeated, so that the operation is complex, and the labor intensity is greatly increased.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a multi-section continuous welding pipeline back protection device which can be adapted to various pipeline specifications and is simple to operate.

The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a multistage continuous welding pipeline back protection device which characterized in that: the blocking assembly comprises a first sleeve ring and a second sleeve ring which are matched with the inner wall of a pipeline, the first sleeve ring and the second sleeve ring are spirally connected to the spiral pipe through sleeve holes, annular grooves are formed in the first sleeve ring and the second sleeve ring, and blocking air bags are arranged in the annular grooves;

the first lantern ring and the second lantern ring are respectively arranged on two sides of a pipeline welded junction position, an accommodating cavity for filling argon is formed between the first lantern ring and the second lantern ring, the first lantern ring and the second lantern ring are identical in structure and are provided with an axial airflow channel axially penetrating through the lantern ring and a radial airflow channel radially arranged, and the radial airflow channel and the axial airflow channel are communicated in an intersection manner; the axial airflow channel is used for being communicated with the airflow pipe in a sealing way; a plurality of flow dividing pipes are uniformly distributed on the airflow pipe, and the flow dividing pipes and the axial line of the axial airflow channel are radially distributed as the circle center; the axial airflow channels between the first sleeve ring and the second sleeve ring are in sealed communication through airflow pipes, and the axial airflow channels of the sleeve rings of two adjacent blocking assemblies are also in sealed communication through airflow pipes;

the blocking air bag is internally provided with a plurality of interlayers which divide the blocking air bag into a plurality of interlayer units along the circumferential direction, and the number of the interlayer units corresponds to the number of the shunt tubes; the inner ring wall of the blocking air bag corresponding to each interlayer unit is provided with a communication port for being in sealed communication with the shunt pipe; the interlayer is a multi-stage telescopic plate, the outermost plate of the multi-stage telescopic plate is fixedly connected with the inner annular wall of the air stopping bag, and the innermost plate of the multi-stage telescopic plate is fixedly connected with the outer annular wall of the air stopping bag; the plurality of shunt tubes are respectively communicated with each interlayer unit of the blocking air bag, and the blocking air bag is provided with an exhaust pipe.

As a preferred technical scheme, a heat insulation rubber pad used for isolating the inner wall of the pipeline is arranged on the blocking air bag.

As a preferable technical scheme, one end of the spiral pipe is provided with a limiting rod used for being abutted with the opening of the pipeline.

As a preferred technical scheme, the number of the interlayer units is 14-20.

As a preferred technical scheme, the diameter of the shunt pipe is larger than that of the exhaust pipe.

The invention has the beneficial effects that: the utility model provides a multistage continuous welding pipeline back protection device blocks gasbag itself and has elasticity, can adjust the bloated range according to the pipeline internal diameter of different specifications to the welding back protection of the multiple pipeline specification of adaptation. The setting of check valve in case one of them interlayer unit is damaged, still can guarantee to block the gasbag and continue to use, has strengthened the reliability that this back of the body gas protection device used greatly, in addition, can weld in succession a plurality of crater positions of one section pipeline through a plurality of subassemblies that block of threaded connection on the spiral pipe, need not to carry out the device again and remove the adjustment, and easy operation is convenient, has greatly reduced intensity of labour.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention to its proper form. It is obvious that the drawings in the following description are only some embodiments, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is an axial cross-sectional view of the first collar;

FIG. 3 is a radial cross-sectional view of the first collar;

FIG. 4 is a graph showing the effect of blocking the elongation of the barrier layer of the air bag.

Shown in the figure: a spiral tube 1; a first collar 2; a second collar 3; a circumferential groove 4; a barrier airbag 5; a housing chamber 6; an airflow pipe 7; a shunt tube 8; an axial gas flow channel 9; a radial gas flow channel 10; pipeline weld crater position 11; a barrier layer 12; an exhaust pipe 13; a restraining bar 14; a heat insulating rubber pad 15.

It should be noted that the drawings and the description are not intended to limit the scope of the inventive concept in any way, but to illustrate it by a person skilled in the art with reference to specific embodiments.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and the following embodiments are used for illustrating the present invention and are not intended to limit the scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The invention is further illustrated with reference to the following figures and examples.

A multi-section continuous welding pipeline back protection device comprises a blocking component and a spiral pipe, wherein the outer wall of the spiral pipe is provided with external threads, the number of the blocking component is at least two, a plurality of crater positions of one section of pipeline can be continuously welded by connecting a plurality of the blocking components through the spiral pipe in a threaded manner, the device movement adjustment is not required to be carried out again, the operation is simple and convenient, the labor intensity is greatly reduced, the blocking component comprises a first lantern ring and a second lantern ring which are matched with the inner wall of the pipeline, sleeve holes are formed in the first lantern ring and the second lantern ring, internal threads which are matched with the external threads of the spiral pipe are arranged in the sleeve holes, the first lantern ring and the second lantern ring are spirally connected onto the spiral pipe through the sleeve holes, and the positions of the blocking components can be simply and quickly adjusted according to the crater positions of the, threaded connection has a plurality of subassemblies that block on the spiral pipe can carry out continuous welding to a plurality of crater positions of one section pipeline, need not to carry out the device again and removes the adjustment. The first lantern ring and the second lantern ring are both provided with annular grooves, annular blocking air bags are arranged in the annular grooves, and the annular grooves can play a role in limiting the positions of the blocking air bags.

As shown in figures 1-4, the multi-section continuous welding pipeline back protection device comprises a blocking component and a spiral pipe 1, wherein the outer wall of the spiral pipe 1 is provided with external threads, the number of the blocking components is at least two, a plurality of welding port positions of a section of pipeline can be continuously welded by connecting a plurality of the blocking components on the spiral pipe 1 in a threaded manner, the device movement adjustment is not required to be carried out again, the operation is simple and convenient, the labor intensity is greatly reduced, the blocking component comprises a first lantern ring 2 and a second lantern ring 3 which are matched with the inner wall of the pipeline, sleeve holes are formed in the first lantern ring 2 and the second lantern ring 3, internal threads matched with the external threads of the spiral pipe 1 are arranged in the sleeve holes, the first lantern ring 2 and the second lantern ring 3 are connected to the spiral pipe 1 in a threaded manner through the sleeve holes, and the positions of the blocking components can be simply and quickly adjusted according to the welding port positions 11 of different positions without using, a plurality of welding port positions of a section of pipeline can be continuously welded by connecting a plurality of blocking assemblies on the spiral pipe 1 in a threaded manner, and the device does not need to be moved and adjusted again. All be provided with hoop recess 4 on first lantern ring 2 and the second lantern ring 3, be provided with annular gasbag 5 that blocks in the hoop recess 4, hoop recess 4 can play the position restriction effect to blocking gasbag 5.

First lantern ring 2 and second lantern ring 3 set up respectively in the both sides of pipeline weld bond position 11, form between first lantern ring 2 and the second lantern ring 3 and be used for filling the chamber 6 that holds of argon gas, first lantern ring 2 is the same with second lantern ring 3's structure, as shown in fig. 1, be equipped with the axial on the lantern ring and link up the axial airflow channel 9 of the lantern ring, as shown in fig. 2, still be equipped with radial airflow channel 10 of radial setting on the lantern ring, radial airflow channel 10 and axial airflow channel 9 intersect and communicate and form the airflow channel on the lantern ring jointly. Specifically, the gas flow channels are adapted to be in sealed communication with the gas flow tube 7 such that argon gas flowing in through the gas flow tube 7 enters the axial gas flow channels 9 on the collar and then the radial gas flow channels 10 on the collar, and the radial gas flow channels 10 on both the first collar 2 and the second collar 3 are in communication with the barrier balloon 5 such that argon gas enters the collar. Further, the axial airflow channels 9 between the first collar 2 and the second collar 3 are in sealed communication through the airflow pipe 7, and the axial airflow channels 9 of the collars of two adjacent blocking assemblies are also in sealed communication through the airflow pipe 7; it is worth mentioning in particular that the gas flow tube 7 must be a hose or an elastic tube with flexibility, since it is sufficient that the blocking member is displaced spirally on the spiral tube 1. (for convenience of drawing in fig. 1, the length of the gas flow pipe 7 is completely matched with the lengths of the first collar 2, the second collar 3 and the adjacent blocking components, and actually, the length of the gas flow pipe 7 is long to meet the requirement of distance adjustment.)

A plurality of shunt tubes 8 are uniformly distributed on the airflow tube 7, and the shunt tubes 8 and the axial line of the axial airflow channel 9 are radially distributed as the circle center. The shunt 8 is in sealed communication with the blocking balloon 5.

The more the heat that blocks that gas and weld crater position near bear is more, high temperature burnout phenomenon appears more easily, blocks the life-span that gasbag 5 used for the extension, prevents high temperature damage, block and be provided with thermal-insulated rubber pad 15 that is used for isolated pipeline inner wall on the gasbag 5. The heat-insulating rubber pad 15 is made of fluororubber, and the fluororubber is a synthetic polymer elastomer with fluorine atoms on carbon atoms of a main chain or a side chain. The introduction of fluorine atoms endows the rubber with excellent heat resistance, oxidation resistance, oil resistance, corrosion resistance and atmospheric aging resistance, and the rubber is widely applied to the fields of aerospace, aviation, automobiles, petroleum, household appliances and the like.

A plurality of interlayer units are arranged in the blocking air bag 5, the interlayer units divide the blocking air bag 5 into a plurality of interlayer units along the circumferential direction by the interlayer units 12, and the number of the interlayer units corresponds to the number of the shunt tubes 8. The inner ring wall of the blocking air bag 5 corresponding to each interlayer unit is provided with a communication port for being communicated with the shunt tubes 8 in a sealing mode, the interlayer 12 divides the air bag into a plurality of independent interlayer units, any interlayer unit is broken, other interlayer units keep the original shape, the leakage of argon is reduced, and the reliability of the blocking air bag 5 is enhanced.

Specifically, as shown in fig. 3 to 4, the partition 12 is a multi-stage expansion plate, an outermost layer plate of the multi-stage expansion plate is fixedly connected to the inner annular wall of the air-blocking bag 5, and an innermost layer plate of the multi-stage expansion plate is fixedly connected to the outer annular wall of the air-blocking bag 5.

The shunt tubes 8 are respectively communicated with each interlayer unit of the blocking air bag 5, and each interlayer unit of the blocking air bag 5 is provided with an exhaust pipe 13. In this embodiment, the design of the blocking airbag 5 is to prevent the blocking airbag 5 from being accidentally damaged to cause leakage of argon gas, and to ensure the inflation protection effect as much as possible. .

Specifically, if the interlayer unit a in fig. 3 and 4 is broken, other interlayer units are still kept, and the sealing effect is kept. Therefore, it is most important that the baffle airbag be of a baffle 12 structure and that the baffle 12 be a multi-stage expansion plate. Due to the structure, when the air bag is not inflated, the air bag 5 is prevented from bulging, and the outer ring wall of the air bag does not apply force to the innermost plate of the multi-stage expansion plate, so that the whole air bag is in a contracted state and small in size, and can conveniently enter and exit in a pipeline. When the air bag is inflated, the outer ring wall of the air bag begins to expand, and force is applied to the innermost plate of the multi-stage expansion plate, so that the multi-stage expansion plate automatically adjusts the adaptive size along with the expansion size of the air bag until the multi-stage expansion plate tightly abuts against the inner wall of the pipeline. And even, the A interlayer unit is damaged, but its two adjacent interlayer units still keep the gas filled state, and the interlayer 12 (multistage expansion plate) of A interlayer unit both sides also belong to adjacent interlayer unit, consequently, the gas filled state of adjacent interlayer unit makes the expansion plate of A interlayer unit both sides still keep length, make A interlayer unit can not flat fall, even guarantee A interlayer unit leaks gas, still kept the support to thermal-insulated rubber pad 15, make it still can seal, reduce the argon gas and reveal probably.

And because of the special structure of the air bag 5, even if the air bag is damaged at a plurality of positions, the air bag can still be used as long as the damage is intermittent damage, the air bag is inflated and protected, and the service durability of the air bag 5 is improved.

The working process is as follows, the protection device is put into the pipeline, the position 11 of the pipeline welded junction is positioned in the area of the containing cavity 6, argon is introduced from the airflow pipe 7, the gas enters the corresponding interlayer units of the blocking air bag 5 through the airflow channel and the shunt pipe 8 on the lantern ring in sequence, in the process that the argon flows into each interlayer unit, the argon of each interlayer unit is gradually discharged into the containing cavity 6 through the exhaust pipe 13, the oxygen in the containing cavity 6 is discharged from the pipeline welded junction, the blocking air bag 5 gradually expands to be tightly attached to the pipe wall, meanwhile, the space of the containing cavity 6 is gradually filled with the argon, and the oxygen content of the containing cavity 6 is rapidly reduced; thereby pipeline crater position 11 both ends block that gasbag 5 all pastes tightly and forms a confined chamber 6 that holds, thereby reduce the oxidation degree, the welding seam quality has effectively been guaranteed, the time of ventilating is short, welder's latency is short, greatly saved the argon gas use amount, especially major diameter pipeline welded saves very obviously, block gasbag 5 itself and have elasticity, can be according to the expanded range of the pipeline internal diameter adjustment of different specifications, thereby the welding back protection of the multiple pipeline specification of adaptation. The structure of the blocking air bag 5 ensures that once one interlayer unit is damaged, the blocking air bag 5 can still be ensured to be continuously used, and the use reliability of the back protection device is greatly enhanced. In addition, a plurality of assemblies that block through threaded connection on spiral pipe 1 can carry out continuous welding to a plurality of crater positions of one section pipeline, need not to carry out the device again and remove the adjustment, and easy operation is convenient, has greatly reduced intensity of labour.

When the gas protection is carried out on the back of the welding seam of the pipeline, the pipeline welding opening position 11 needs to be located in the area where the accommodating cavity 6 is located, and in order to position the position of the accommodating cavity 6 and enable the position to quickly reach the pipeline welding opening position 11, the opening end of the spiral pipe 1 is provided with a limiting rod 14 used for being abutted to the opening part of the pipeline. Measure the distance of pipeline weld bond position 11 to the pipeline oral area in advance, when stopping the subassembly installation, make and hold 6 just adaptation pipeline weld bond position 11 to the distance of pipeline oral area apart from the position of 1 port of spiral pipe in chamber, restriction bar 14 can play the limiting displacement to spiral pipe 1, when restriction bar 14 and pipeline oral area looks butt, pipeline weld bond position 11 just is located and holds the region at 6 places in chamber, can practice thrift the adjustment time who stops the subassembly position greatly, improve work efficiency.

The protective effect is not obvious when the number of the interlayer units is too small, the manufacturing cost is increased when the number of the interlayer units is too large, the number of the interlayer units is preferably 14-20, the interlayer units are more uniformly distributed, and the sealing effect on the device is good.

Further, the diameter of the exhaust pipe 13 is smaller than that of the shunt pipe 8.

Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. The utility model provides a multistage continuous welding pipeline back protection device which characterized in that: the blocking assembly comprises a first sleeve ring and a second sleeve ring which are matched with the inner wall of a pipeline, the first sleeve ring and the second sleeve ring are spirally connected to the spiral pipe through sleeve holes, annular grooves are formed in the first sleeve ring and the second sleeve ring, and blocking air bags are arranged in the annular grooves;

2. The multi-segment continuously welded pipe back protector of claim 1, wherein: and a heat insulation rubber pad (17) for isolating the inner wall of the pipeline is arranged on the blocking air bag.

3. The multi-segment continuously welded pipe back protector of claim 1, wherein: and one end of the spiral pipe is provided with a limiting rod which is used for being abutted against the opening part of the pipeline.

4. The multi-segment continuously welded pipe back protector of claim 1, wherein: the number of the interlayer units is 14-20.

5. The multi-segment continuously welded pipe back protector of claim 1, wherein: the diameter of shunt tubes is larger than that of exhaust pipes.