CN111112391A - Correction device for welding seam bell mouth of large-diameter thin-wall coiled pipe and application method of correction device - Google Patents
Correction device for welding seam bell mouth of large-diameter thin-wall coiled pipe and application method of correction device Download PDFInfo
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- CN111112391A CN111112391A CN202010119265.9A CN202010119265A CN111112391A CN 111112391 A CN111112391 A CN 111112391A CN 202010119265 A CN202010119265 A CN 202010119265A CN 111112391 A CN111112391 A CN 111112391A
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- 238000012937 correction Methods 0.000 title claims abstract description 68
- 238000003466 welding Methods 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000010935 stainless steel Substances 0.000 claims description 38
- 229910001220 stainless steel Inorganic materials 0.000 claims description 38
- 229910000831 Steel Inorganic materials 0.000 claims description 29
- 239000010959 steel Substances 0.000 claims description 29
- 238000003825 pressing Methods 0.000 claims description 5
- 230000003014 reinforcing effect Effects 0.000 claims description 4
- 238000013461 design Methods 0.000 abstract description 5
- 238000001514 detection method Methods 0.000 abstract description 4
- 238000012423 maintenance Methods 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 description 8
- 238000005520 cutting process Methods 0.000 description 6
- 239000007789 gas Substances 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 238000010276 construction Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000000571 coke Substances 0.000 description 3
- 238000000746 purification Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000004939 coking Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D3/00—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts
- B21D3/10—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts between rams and anvils or abutments
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
The invention discloses a correction device for a welding seam bell mouth of a large-diameter thin-wall coiled pipe, which comprises a base, a jacking device and a pipeline upper semicircle correction block, wherein the jacking device is arranged on the base; two pipeline lower semicircular correcting blocks are symmetrically welded on two sides of the longitudinal center line of the base, two ends of the two pipeline lower semicircular correcting blocks are respectively and vertically welded with a supporting frame, and the tops of the two supporting frames are welded with a cross beam; the bottom of the upper semicircular correcting block of the pipeline is provided with a downward arc surface, and the center of the top of the upper semicircular correcting block is provided with the jacking device; the lower pipe semicircle correcting block is provided with an upward arc surface, and the radius of the arc surface of the lower pipe semicircle correcting block is the same as that of the arc surface of the upper pipe semicircle correcting block. The invention has novel structural design, compact and reasonable configuration, low investment, low operation and maintenance cost and convenient operation, and can effectively correct the welding seam bell mouth of the large-diameter thin-wall coil pipe by matching with the use method, so that the corrected coil pipe completely meets the process specification and the assembly tolerance size and can pass each detection at the later stage of pipeline assembly.
Description
Technical Field
The invention belongs to the technical field of pipeline correction, and particularly relates to a correction device for a large-diameter thin-wall reel pipe welding seam bell mouth and a use method thereof.
Background
At present, chemical enterprises often involve the construction of various large-diameter pipelines in the process of newly building or transforming various projects, for example, a first purification system and a second purification system of a martensitic coal coking company (south district) are combined to promote the project, namely, a set of AS process gas purification device is newly built in an old tar processing device region, and a newly-built crude benzene unit and a solvent dephenolization unit are matched to meet the requirement of purifying the existing six coke oven gas in the south district of the coal coking company and also consider the requirement of promoting the coke productivity in the future south district. The whole system after being transformed has the capability of stable production under low load under special conditions such as overhaul of the coke oven and the like. In this transformation project, the construction of external pipeline is the important thing in the project, and it includes: 1) gas pipelines connecting each unit, device and plant boundary; 2) process pipelines for conveying various materials; 3) part of the utility pipes. And in the undertaken pipeline construction tasks: the process pipeline comprises a DN530 stainless steel pipe (the material is S30408 is a large-diameter and thin-wall pipeline, the medium is a circulating ammonia water pipeline, the grade of a pressure pipeline is C3, the inspection grade of the pipeline is III, the design pressure is 0.7MPa, the test pressure is 1.05MPa, and the weight is 84t), and the pipeline is manufactured by adopting stainless steel plate reelpipes in a welding way according to a series of requirements of design and welding quality, so that the pipeline welding quality is ensured, the manufacturing time is saved, the labor intensity is reduced, and auxiliary materials are saved, and the traditional process flow pipeline manufacturing method is as follows: purchasing a stainless steel plate, accurately blanking according to a drawing, processing a pipe bender, manually assembling, fixing by spot welding, reinforcing a fixed deformation tool, inflating, welding, cleaning the surface, checking and the like. However, in the welding process flow, although all butt joints of the large-diameter thin-wall coiled pipes are provided with welding deformation prevention tools before welding, the welding joints are long, the deformation amount of stainless steel caused by thermal expansion and cold contraction relative to carbon steel is large, and the problem that after the final batch of pipelines are welded, bell mouths are generated at the welding joints at two ends of the coiled pipes, and each section of pipeline cannot be assembled in an assembly mode exists. Therefore, for the construction of the DN530 large-diameter stainless steel thin-wall coiled pipe, a simple structural part device for correcting the welding seam bell mouth of the large-diameter thin-wall coiled pipe needs to be designed to solve the problem. At present, various pipeline reelpipe ellipses are corrected generally, and are applied widely, but a few documents describe, but a correction device for a welding seam bell mouth of a large-diameter thin-wall stainless steel reelpipe is not used on site, and in addition, if a correction production line for the welding seam bell mouth of the large-diameter thin-wall stainless steel reelpipe is designed according to requirements, although the automation degree is high, the problem can be solved, for small-batch pipelines with a small engineering quantity, the last correction production line not only has the problem of investment benefit ratio, but also occupies a large space, and has the defect that resources cannot be fully utilized.
Disclosure of Invention
The invention aims to solve the problem that a large-diameter thin-wall reel pipe cannot be assembled due to a welding seam bell mouth in the background technology, provides a correction device for the welding seam bell mouth of the large-diameter thin-wall reel pipe and a use method thereof, and implements the correction device, so that the correction device not only saves the progress time of relevant working procedures, but also can be conveniently used on site, is simple to operate, ensures that the corrected reel pipe completely meets the process specification and the assembly tolerance size, reduces the cost, and can pass various detection in the later period of pipeline assembly.
The technical scheme for solving the technical problem of the invention is as follows:
the invention relates to a correction device for a welding seam bell mouth of a large-diameter thin-wall reelpipe, which is characterized by comprising a base, a jacking device and a pipeline upper semicircle correction block; two pipeline lower semicircular correcting blocks are symmetrically welded on two sides of the longitudinal center line of the base, two ends of the two pipeline lower semicircular correcting blocks are respectively and vertically welded with a supporting frame, and the tops of the two supporting frames are welded with a cross beam; the bottom of the upper semicircular correcting block of the pipeline is provided with a downward arc surface, and the center of the top of the upper semicircular correcting block of the pipeline is provided with the jacking device; the pipe lower semi-circle correcting block is provided with an upward arc surface, and the radius of the arc surface of the pipe lower semi-circle correcting block is the same as that of the arc surface of the pipe upper semi-circle correcting block.
As a further improvement of the technical scheme of the invention, stiffened plates are respectively welded between the top ends of the two support frames and the cross beam.
As a further improvement of the technical scheme of the invention, the jacking device is a hydraulic jack.
As a further improvement of the technical scheme of the invention, the base is made of channel steel with the specification of 200 mm.
As a further improvement of the technical scheme of the invention, the supporting frame and the cross beam are both made of H-shaped steel with the specification of 200 mm.
As a further improvement of the technical scheme of the invention, the upper semicircular correcting block of the pipeline is made of a steel plate with the thickness of 50 mm; the lower semicircular correcting block of the pipeline is made of a steel plate with the thickness of 20 mm.
As a further improvement of the technical scheme of the invention, the stiffened plate is an isosceles right triangle-shaped steel plate and is made of a steel plate with the thickness of 20mm, and two right-angle sides of the stiffened plate are respectively welded and fixed with the supporting frame and the cross beam.
Another technical solution to solve the technical problem of the present invention is as follows:
the use method of the correction device for the welding seam bell mouth of the large-diameter thin-wall reel pipe in the technical scheme is applied to correction of the welding seam bell mouth of the large-diameter stainless steel thin-wall reel pipe, and is characterized in that the arc-shaped radius of the upper semicircular correction block and the lower semicircular correction block of the pipeline of the correction device is consistent with the radius of the large-diameter stainless steel thin-wall reel pipe when the correction device is manufactured, and the method comprises the following steps: any one end of a welding seam bell mouth of the large-diameter stainless steel thin-wall reel pipe is horizontally placed between two lower semicircular correction blocks of a pipeline of the correction device, meanwhile, the welding seam bell mouth is perpendicular to the upper and lower center lines of the pipe diameter of the large-diameter stainless steel thin-wall reel pipe, then an upper semicircular correction block of the pipeline is placed on the welding seam bell mouth of the large-diameter stainless steel thin-wall reel pipe, the arc surface is downward, then a jacking device is placed on the top plane of the upper semicircular correction block of the pipeline, the jacking device is made to abut against the bottom of the cross beam, then pressing is conducted through the jacking device from top to bottom according to the stress and the ovality of the large-diameter stainless steel thin-wall reel pipe, and correction is completed.
As a further improvement of the technical scheme of the invention, the pressing sizes of the jacking device and the pipeline semicircular correcting device are within the range of the calculated stainless steel resilience tolerance of the large-diameter stainless steel thin-wall reelpipe.
Compared with the prior art, the correction device for the welding seam bell mouth of the large-diameter thin-wall reelpipe has the advantages of novel structural design, compact and reasonable configuration, investment saving, low operation and maintenance cost, convenience in operation and reliability in operation, can be used for effectively correcting the welding seam bell mouth of the large-diameter thin-wall reelpipe by matching with a using method of the correction device, ensures that the corrected reelpipe completely meets the process specification and the assembly tolerance size, can pass each detection item in the later period of pipeline assembly, is also suitable for other similar pipeline corrections, has strong practicability and is worthy of popularization.
Drawings
The invention is further described with reference to the following figures and detailed description:
FIG. 1 is a schematic structural view of a large-diameter thin-walled coil pipe weld flare correction device according to the present invention;
in the figure: 1-base 2-support frame 3-crossbeam 4-jacking device 5-pipe upper semicircle correcting block 6-pipe lower semicircle correcting block 7-large diameter stainless steel thin wall reel pipe 8-welding seam bell mouth 9-stiffened plate.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The terms "upper", "lower", "left", "right", "front", "rear", and the like used in the specification and claims of the present disclosure are used only to indicate relative positional relationships, and when the absolute position of a described object is changed, the relative positional relationships are changed accordingly.
Example 1:
as shown in fig. 1, the correction device for the welding seam bell mouth of the large-diameter thin-wall coil pipe of the invention is described by taking the application of the correction device to a DN530 large-diameter stainless steel thin-wall coil pipe as an example, but the correction device is not only applied to the large-diameter thin-wall coil pipe of the specification, but also can be applied to large-diameter thin-wall coil pipes of other specifications by slightly changing the sizes of components in the correction device, and is characterized by comprising a base 1, a jacking device 4 and a pipe upper semicircular correction block 5; the base 1 is made of channel steel with the specification of 200mm, two pipeline lower semicircular correcting blocks 6 are symmetrically welded on two sides of the longitudinal center line of the base 1, two ends of the base are respectively and vertically welded with the supporting frames 2, the tops of the two supporting frames 2 are welded with the cross beam 3, and the two supporting frames 2 and the cross beam 3 form a framework in the shape of Jiong; the bottom of the upper semicircular correcting block 5 of the pipeline is provided with a downward arc surface, the center of the top of the upper semicircular correcting block is provided with the jacking device 4, and the jacking device 4 can be a hydraulic jack device and comprises a hydraulic cylinder, a hydraulic pump, a liquid, a piston, a handle, a liquid return valve and the like which are matched; the lower pipe semicircle correcting block 6 is provided with an upward arc surface, the radius of the arc surface of the lower pipe semicircle correcting block 6 is the same as that of the arc surface of the upper pipe semicircle correcting block 5, and the radius of the arc surface is determined according to the radius of the large-diameter thin-wall reel pipe to be applied. In this embodiment, the two support frames 2 and the cross beam 3 are both made of H-shaped steel with a specification of 200mm, a stiffened plate 9 is welded between the top end of each support frame 2 and the cross beam 3, further, the stiffened plate 9 is a steel plate in the shape of an isosceles right triangle and is made of a steel plate with a thickness of 20mm, and two right-angle sides of the stiffened plate are welded and fixed with the support frames 2 and the cross beam 3 respectively to increase the stability between the support frames 2 and the cross beam 3; in this embodiment, the pipe upper semi-circular straightening block 5 is made of a steel plate with a thickness of 50mm, and the pipe lower semi-circular straightening block 6 is made of a steel plate with a thickness of 20 mm.
When the correction device for the welding seam bell mouth of the large-diameter thin-wall reel pipe is manufactured, a welding mode is mainly adopted, and the manufacturing method comprises the following steps:
1. welding equipment and welding materials: adopting carbon dioxide gas shielded welding, wherein the welding wire is an ER50-6 welding wire;
2. auxiliary tools: the device comprises a wrench, an adjusting rod, a steel tape, a large hammer, a small hammer, a bevel protractor, a cutting machine, an angle grinder, an angle grinding piece, gloves and glasses;
3. the device manufacturing main steps are as follows: according to the design requirements of a base 1, a support frame 2, a cross beam 3, a stiffened plate 9, an upper pipeline semicircular correcting block 5 and a lower pipeline semicircular correcting block 6 in the device, marking lines of all parts are respectively formed on H-shaped steel with the specification of 200mm, channel steel with the specification of 200mm and a steel plate with the thickness of 20mm, and then operations such as cutting by a cutting machine, polishing by an angle grinder, manual assembly, carbon dioxide gas shielded welding spot welding, measurement correction, front-back double-side welding, detection of weld defects, polishing of the surface of an integral angle grinder, acceptance and conformity with roundness size and cleaning of the surface of the manual angle grinder are sequentially carried out; in the manufacturing process, according to the structure of the correcting device, two support frames 2 are respectively arranged on two sides of a base 1, a cross beam 3 is arranged at the tops of the two support frames 2, two isosceles right-angle triangular stiffened plates 9 are arranged at right angles of the two support frames 2 and the cross beam 3, the right-angle sides of the two stiffened plates 9 are respectively perpendicular to the support frames 2 and the cross beam 3, and then two lower pipeline semicircular correcting blocks 6 are fixed on two sides of the central line on the base 1 to ensure sufficient roundness; a hydraulic jack device is adopted as a jacking device 4 in the correction device and is matched with a semicircular correction block 5 on a pipeline for use, and a hydraulic cylinder of the hydraulic jack device, a hydraulic pump, a liquid, a piston, a handle, a liquid return valve and the like matched with the hydraulic cylinder are prepared before use; in the embodiment, the pipe upper semicircle correcting block 5 is made of steel plates with the diameter of 50 multiplied by 100 multiplied by 300mm, one surface of the steel plate is a plane, and the other surface of the steel plate is cut by a cutting machine according to the circular arc of the DN530 large-diameter stainless steel thin-wall coiled pipe 7, so that the specification of the DN530 large-diameter stainless steel thin-wall coiled pipe 7 can be conveniently corrected; the two lower pipeline semi-circle correction blocks 6 are made of two 20X 100X 300mm steel plates, each steel plate is formed by argon arc cutting according to DN530 large-diameter stainless steel thin-wall reel pipe 7 through a cutting machine along the thickness of the steel plate, and then the steel plates are respectively welded on two sides of the central line on the base 1, so that the roundness of the large-diameter stainless steel thin-wall reel pipe 7 during correction is guaranteed, and the correction device is manufactured.
Example 2:
the use method of the correction device for the weld bellmouth of the large-diameter thin-wall reel pipe in the above embodiment is applied to the correction of the weld bellmouth 8 of the large-diameter stainless steel thin-wall reel pipe 7, the correction device is manufactured to ensure that the arc radiuses of the upper and lower semicircular correction blocks 5 and 6 of the pipeline are consistent with the radius of the large-diameter stainless steel thin-wall reel pipe 7, and are also consistent with embodiment 1, the correction device is used for correcting the weld bellmouth 8 of the large-diameter stainless steel thin-wall reel pipe 7 with the specification of DN530, and the method is as follows: any one end of a welding seam bell mouth 8 of the large-diameter stainless steel thin-wall reel pipe 7 is horizontally placed between two lower pipeline semicircular correction blocks 6 of the correction device, meanwhile, the welding seam bell mouth 8 is perpendicular to the upper and lower pipe diameter central lines of the large-diameter stainless steel thin-wall reel pipe 7, then an upper pipeline semicircular correction block 5 is placed on the welding seam bell mouth 8 of the large-diameter stainless steel thin-wall reel pipe 7, the arc surface faces downwards, then a jacking device 4 is placed on the top plane of the upper pipeline semicircular correction block 5, the jacking device 4 adopts a hydraulic jack, so that the hydraulic jack props against the bottom of the cross beam 3, and during operation, a manually operated hydraulic jack handle is pressed from top to bottom according to the stress and the ellipticity of the large-diameter stainless steel reel pipe 7 to finish correction. Further, in the method, the pressing sizes of the jacking device 4 and the pipeline semi-circle correction device 5 are within the range of the calculated stainless steel resilience tolerance of the large-diameter stainless steel thin-wall coiled pipe 7.
Claims (9)
1. A correction device for a welding seam horn mouth of a large-diameter thin-wall coiled pipe is characterized by comprising a base (1), a jacking device (4) and an upper semicircular correction block (5) of a pipeline; two pipeline lower semicircular correcting blocks (6) are symmetrically welded on two sides of the longitudinal center line of the base (1), two ends of the base are respectively and vertically welded with the supporting frames (2), and the tops of the two supporting frames (2) are welded with the cross beam (3); the bottom of the upper semicircular correcting block (5) of the pipeline is provided with a downward arc surface, and the center of the top of the upper semicircular correcting block is provided with the jacking device (4); the lower pipeline semicircle correcting block (6) is provided with an upward arc surface, and the radius of the arc surface of the lower pipeline semicircle correcting block (6) is the same as that of the arc surface of the upper pipeline semicircle correcting block (5).
2. The correcting device for the welding seam bell mouth of the large-diameter thin-wall coiled pipe according to claim 1, characterized in that a reinforcing plate (9) is further welded between the top ends of the two support frames (2) and the cross beam (3) respectively.
3. The straightening device for the weld flare of the large-diameter thin-walled coiled pipe according to claim 1 or 2, characterized in that the jacking device (4) is a hydraulic jack.
4. The device for correcting the flare of the weld of the large-diameter thin-wall coiled pipe according to claim 1, wherein the base (1) is made of channel steel with the specification of 200 mm.
5. The large-diameter thin-wall coil pipe weld bellmouth correction device is characterized in that the support frame (2) and the cross beam (3) are both made of 200mm H-shaped steel.
6. The straightening device for the weld bellmouth of the large-diameter thin-wall coiled pipe according to claim 1, characterized in that the upper semicircular straightening block (5) of the pipeline is made of a steel plate with the thickness of 50 mm; the lower pipe semicircle straightening block (6) is made of a steel plate with the thickness of 20 mm.
7. The device for correcting the welding line bell mouth of the large-diameter thin-wall reel pipe according to claim 2, wherein the reinforcing plate (9) is an isosceles right-triangle steel plate and is made of a steel plate with the thickness of 20mm, and two right-angle sides of the reinforcing plate are respectively welded and fixed with the support frame (2) and the cross beam (3).
8. The use method of the correction device for the weld bellmouth of the large-diameter thin-wall coiled pipe according to any one of claims 1 to 7, which is applied to the correction of the weld bellmouth (8) of the large-diameter stainless steel thin-wall coiled pipe (7), is characterized in that the correction device is manufactured to ensure that the radius of the arcs of the upper and lower semicircular correction blocks (5 and 6) of the pipeline is consistent with the radius of the large-diameter stainless steel thin-wall coiled pipe (7), and the method comprises the following steps: any one end of a welding seam horn mouth (8) of the large-diameter stainless steel thin-wall reel pipe (7) is horizontally placed between two lower semicircular correction blocks (6) of the two pipelines of the correction device, meanwhile, the welding seam horn mouth (8) is perpendicular to the upper and lower center lines of the pipe diameter of the large-diameter stainless steel thin-wall reel pipe (7) is guaranteed, then an upper semicircular correction block (5) of the pipeline is placed on the welding seam horn mouth (8) of the large-diameter stainless steel thin-wall reel pipe (7), the arc surface is downward, then a jacking device (4) is placed on the top plane of the upper semicircular correction block (5) of the pipeline, the jacking device (4) jacks the bottom of the cross beam (3), and then pressing from top to bottom is carried out according to the stress and the ellipticity of the large-diameter stainless steel thin-wall reel pipe (7), and correction is completed.
9. The use method of the correction device for the weld bellmouth of the large-diameter thin-wall coiled pipe according to claim 8, wherein the pressing sizes of the jacking device (4) and the pipeline semi-circle correction device (5) are within the calculated stainless steel resilience tolerance range of the large-diameter stainless steel thin-wall coiled pipe (7).
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| CN202010119265.9A CN111112391A (en) | 2020-02-26 | 2020-02-26 | Correction device for welding seam bell mouth of large-diameter thin-wall coiled pipe and application method of correction device |
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| CN202010119265.9A CN111112391A (en) | 2020-02-26 | 2020-02-26 | Correction device for welding seam bell mouth of large-diameter thin-wall coiled pipe and application method of correction device |
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| CN112474899A (en) * | 2020-11-30 | 2021-03-12 | 合肥工业大学 | Rubber plastic soft mold correction device and method for multi-cavity special-shaped double-layer thin-wall section pipe |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112091001A (en) * | 2020-09-02 | 2020-12-18 | 杭州灰度元素装饰工程有限公司 | Pipeline shaping device |
| CN112474899A (en) * | 2020-11-30 | 2021-03-12 | 合肥工业大学 | Rubber plastic soft mold correction device and method for multi-cavity special-shaped double-layer thin-wall section pipe |
| CN112474899B (en) * | 2020-11-30 | 2023-07-04 | 合肥工业大学 | Multi-cavity special-shaped double-layer thin-wall section pipe rubber and plastic soft mold correction device and method thereof |
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