CN102000716B - Production line of major diameter straight welded pipe - Google Patents
Production line of major diameter straight welded pipe Download PDFInfo
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- CN102000716B CN102000716B CN 201010571178 CN201010571178A CN102000716B CN 102000716 B CN102000716 B CN 102000716B CN 201010571178 CN201010571178 CN 201010571178 CN 201010571178 A CN201010571178 A CN 201010571178A CN 102000716 B CN102000716 B CN 102000716B
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 66
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 55
- 239000010959 steel Substances 0.000 claims abstract description 55
- 238000003801 milling Methods 0.000 claims abstract description 32
- 238000000034 method Methods 0.000 claims abstract description 28
- 238000001816 cooling Methods 0.000 claims abstract description 19
- 238000004513 sizing Methods 0.000 claims abstract description 14
- 238000010008 shearing Methods 0.000 claims abstract description 9
- 238000003466 welding Methods 0.000 claims abstract description 9
- 238000007493 shaping process Methods 0.000 claims abstract description 3
- 238000007689 inspection Methods 0.000 claims description 23
- 238000000137 annealing Methods 0.000 claims description 7
- 238000010409 ironing Methods 0.000 claims description 7
- 238000001514 detection method Methods 0.000 claims description 6
- 238000010924 continuous production Methods 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 238000012545 processing Methods 0.000 abstract description 4
- 238000010438 heat treatment Methods 0.000 abstract 1
- 238000005096 rolling process Methods 0.000 abstract 1
- 238000003860 storage Methods 0.000 abstract 1
- 238000000465 moulding Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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Abstract
The invention belongs to the production device of a major diameter straight welded pipe, particularly relating to a production line of a major diameter straight welded pipe for producing a welded steel pipe in which the caliber is greater than phi 630mm; the production line is characterized in that the production line of a major diameter straight welded pipe is arranged according to the manufacturing process of the major diameter straight welded pipe; the production line of a major diameter straight welded pipe comprises a storage platform, a charging trolley, an uncoiler, a leveler, a shearing butt welding machine, a movable sleeve, an edge milling machine, a steel plate diagnostic machine, a lifting platform, a steel pipe shaping machine set, a welding device, a pulling device, a heat treatment device, a cooling device, a sizing plate type rigid rolling machine, a length cutter and an emptying rack; the production device has reasonable arrangement in process; an advanced processing machine is preferably selected in each process, which can manufacture the major diameter straight welded pipe continuously without requiring overweight jigs; and the production line has the advantages of reliability in operation, high production efficiency, stable product quality, low manufacturing cost, safety in operation and convenience in use.
Description
Technical field
The invention belongs to the process units of making large diameter longitudinal welded pipe, particularly manufacture caliber greater than a kind of large diameter longitudinal welded pipe production line of the welded still pipe of ∮ 630 ㎜.
Background technology
At present, along with advancing of science and technology, all trades and professions increase day by day to the transfer pipeline product in machinery industry; In the oil exploitation industry, need a large amount of Large Diameter Pipeline and high performance carrier pipe; Particularly caliber is greater than the carrier pipe of ∮ 630 ㎜.The outer steel pipe's production factory of Present Domestic only can manufacture the carrier pipe less than ∮ 630 ㎜.And in the carrier pipe of manufacturing less than ∮ 630 ㎜, all adopt single manufacture method; The steel pipe's production employing FFX of the factory method of forming as external in some---be the flexible formation method; Also have some common row's roll-type forming units that adopt of steel pipe's production factory both domestic and external.So, above-mentioned each the single manufacture method of attempt employing is manufactured the carrier pipe greater than ∮ 630 ㎜, become a very scabrous problem of steel pipe's production both domestic and external factory, as making large diameter longitudinal welded pipe with row's roll-type forming unit, it is to be covered with format roll on the forming face of work piece, although the molding effect of steel pipe is cut with scissors, the weight of its one of them outer roller just needs more than ten tons, dress is made, pressed to so large frock both difficulty, and investment greatly again; Both production efficiency was low, and welding tube quality is unstable again; Therefore let alone manufacture production line greater than the welded pipe of ∮ 630 ㎜ especially Present Domestic outer steel pipe's production factory can not manufacture welded pipe greater than ∮ 630 ㎜ with above-mentioned any single manufacture method.Therefore, for the problem of above-mentioned existence, it is very necessary researching and developing a kind of large diameter longitudinal welded pipe production line of manufacturing greater than the welded still pipe of ∮ 630 ㎜.
Summary of the invention
The present invention is intended to the shortcoming and defect part that exists in above-mentioned technology, procedure arrangement is reasonable and provide not only, and preferred advanced processing equipment in each operation, can make continuously the ERW in large footpath, not need again overweight frock, and have reliable, production efficiency is high, constant product quality, low cost of manufacture, handling safety and use be a kind of large diameter longitudinal welded pipe production line very easily.
the objective of the invention is to adopt following technical scheme to realize: described large diameter longitudinal welded pipe production line is characterized in that: by the large diameter longitudinal welded pipe production line of large diameter longitudinal welded pipe technological process of production installing, described large diameter longitudinal welded pipe production line mainly is comprised of storing stand, feeding cart, uncoiler, level(l)ing machine, Shearing Butt Resistance Welder, kink, edge milling machines, steel plate inspection machine, lifting platform, steel pipe forming unit, welder, pull unit, annealing device, cooling device, the board-like rigidity milling train of sizing, scaling cutter and blanking rack, a plurality of work pieces with the coil of strip shape that are stored in storing stand are transported on uncoiler by feeding cart, by the pinch mechanism of level(l)ing machine, the work piece with the steel shape of decontroling on uncoiler is sent into level(l)ing machine and carries out leveling, with the forward and backward work piece with the steel shape after leveling by Shearing Butt Resistance Welder integrally welded, for the work piece of the slab shape of continuous production, by the pinch mechanism of kink, the work piece of slab shape is rolled up subsequently and be stored on kink, the work piece of the slab shape on kink is sent into edge milling machines through the outlet of kink, edge milling machines is just according to the circumference of work piece, the width of plate slab that namely needs mills limit and milling bevel for welding and the flaw detection of steel plate inspection machine to the work piece of slab shape, the work piece of the finished product slab shape after the flaw detection of steel plate inspection machine is qualified is sent into the steel pipe forming unit through lifting platform, the work piece of the steel tubular after the steel tube shaping machine composing type is sent into welder work piece is imposed straight seam welding, ironing and seam inspection inspection, install pull unit in the unit of the production line production line after welder, the work piece that this pull unit of mat drives steel tubular moves forward, and the work piece of the welded tube shape after the seam inspection passed examination is sequentially sent into annealing device, in cooling device, be transported in the board-like rigidity milling train of sizing through the work piece of cooled welded tube shape and carry out the size sizing by the requirement of product standard regulation, the work piece of the finished product shape after sizing is qualified sends into by the welded tube length of customer requirements that to send on blanking rack warehouse-in after scaling cutter cuts off standby.
Described lifting platform is the height-adjustable lifting platform that drives by screw elevator.
Described steel pipe forming unit sequentially is comprised of the curved joggling machine of sky, row-roll forming process machine and board-like rigidity milling train; Wherein said board-like rigidity milling train is comprised of Rack Body, upper horizontal roller mechanism, upper horizontal roller governor motion, slide, supporting plate, hydraulic cylinder, lower horizontal roller mechanism, lower horizontal roller governor motion, edge-on roller mechanism and edge-on roller governor motion.
Described welder sequentially is comprised of bonding machine, ironing machine and seam inspection machine.
Described cooling device sequentially is comprised of air cooling roller-way and water cooling roller channel.
Because the present invention is that the technological process of production according to ERW begins to finally the large footpath welded tube finished product that meets customer requirements being transported to the tinuous production of the streamlined formula on the blanking rack operation from the raw material operation.In fact, this tinuous production mainly according to the different process of work piece sequentially by the tinuous production of the work piece of the work piece of the work piece of the work piece of the work piece of forward and backward work piece with the steel shape, slab shape, finished product slab shape, steel tubular, welded tube shape and finished product shape.In order to realize the tinuous production of this one continuous line formula, at first with the forward and backward work piece with the steel shape after leveling by Shearing Butt Resistance Welder in rapid succession integrally welded, for the work piece of the slab shape of continuous production, make the raw material supply operation guarantee the most important condition of tinuous production.Adopted the steel pipe forming unit that is combined into by the curved joggling machine of sky, row-roll forming process machine and board-like rigidity milling train in this external steel pipe forming operation.Why adopt the steel pipe forming unit that is combined into by the curved joggling machine of sky, row-roll forming process machine and board-like rigidity milling train, this is because the rule of steel pipe forming process progressively is shaped to " U " shape cross section from work piece " " shape cross section by forming machine usually, makes at last work piece be transitioned into the characteristic of " О " cross section of remaining silent from " U " shape cross section moulding of opening.Therefore, the present invention by research and analyse the steel pipe forming process characteristic the molding procedure of the welded tube make-up machine of straight seam group that is comprised of the curved joggling machine of sky, row-roll forming process machine and board-like rigidity milling train has been proposed sequentially.Also just reasonably adopt the forming machine that adapts with the steel pipe forming characteristic in different formative stages according to the steel pipe forming characteristic.The present invention is at " one " shape cross section of work piece---the empty curved joggling machine that has adopted a plurality of crimp mechanism to form in the formative stage of " U " shape cross section; Adopted in formative stage in " U " shape cross section that the outer roller arrangement that is comprised of outer roller arrangement, interior roller, depress roller device, lower driven roller, crossbeam, support, base and snub pulley and interior roller are combination, row-roll forming process machine open type; And the board-like rigidity milling train that has adopted the board-like rigid mounting more than three to form in " О " cross section formative stage of remaining silent, its each board-like rigid mounting is comprised of Rack Body, upper horizontal roller mechanism, upper horizontal roller governor motion, slide, supporting plate, hydraulic cylinder, lower horizontal roller mechanism, lower horizontal roller governor motion, edge-on roller mechanism and edge-on roller governor motion.Therefore, make welded still pipe realize molding effect preferably in forming process; Thereby come the satisfying the market needs by the present invention with regard to having realized the welded still pipe of manufacturing greater than ∮ 630 ㎜.Based on this because of, therefore with called after of the present invention " large diameter longitudinal welded pipe production line "; In order to ensure stable and reliable operation of the present invention, the pull unit that in the living line line unit after the welder operation, the work piece of installing driving steel tubular moves forward.
Combine the above technical scheme of taking, realize purpose of the present invention.
Compared with prior art, the present invention not only procedure arrangement is reasonable, and preferred advanced processing equipment in each operation, can make continuously the ERW in large footpath, not need again overweight frock, and have reliable, production efficiency is high, constant product quality, low cost of manufacture, handling safety and use the advantages such as very convenient.
Description of drawings
The present invention has four width accompanying drawings.Wherein:
Accompanying drawing 1 is the horizontal layout schematic diagram of processing machine in each operations of specific embodiments of the invention;
Accompanying drawing 2 is the A place enlarged diagrams in Fig. 1;
Accompanying drawing 3 is the B place enlarged diagrams in Fig. 1;
Accompanying drawing 4 is the C place enlarged diagrams in Fig. 1.
in figure: 1, storing stand, 2, feeding cart, 3, uncoiler, 4, level(l)ing machine, 5, Shearing Butt Resistance Welder, 6, kink, 7, edge milling machines, 8, the steel plate inspection machine, 9, lifting platform, 10, the steel pipe forming unit, 11, welder, 12, pull unit, 13, annealing device, 14, cooling device, 15, the board-like rigidity milling train of sizing, 16, scaling cutter, 17, blanking rack, 18, empty curved joggling machine, 19, the row-roll forming process machine, 20, board-like rigidity milling train, 21, bonding machine, 22, ironing machine, 23, the seam inspection machine, 24, the air cooling roller-way, 25, water cooling roller channel.
The specific embodiment
Be specific embodiments of the invention shown in Fig. 1,2,3,4, it is the large diameter longitudinal welded pipe production line of making ∮ 711 ㎜, it is characterized in that: by the large diameter longitudinal welded pipe production line of large diameter longitudinal welded pipe technological process of production installing; Described large diameter longitudinal welded pipe production line mainly is comprised of storing stand 1, feeding cart 2, uncoiler 3, level(l)ing machine 4, Shearing Butt Resistance Welder 5, kink 6, edge milling machines 7, steel plate inspection machine 8, lifting platform 9, steel pipe forming unit 10, welder 11, pull unit 12, annealing device 13, cooling device 14, the board-like rigidity milling train 15 of sizing, scaling cutter 16 and blanking rack 17; A plurality of work pieces with the coil of strip shape that are stored in storing stand 1 are transported on uncoiler 3 by feeding cart 2, pinch mechanism by level(l)ing machine 4 is sent the work piece with the steel shape of decontroling on uncoiler 3 into level(l)ing machine 4 and is carried out leveling, with the forward and backward work piece with the steel shape after leveling by Shearing Butt Resistance Welder 5 integrally welded, for the work piece of the slab shape of continuous production; by the pinch mechanism of kink 6, the work piece of slab shape is rolled up subsequently and be stored on kink 6, the work piece of the slab shape on kink 6 is sent into edge milling machines 7 through the outlet of kink 6, edge milling machines 7 is just according to the circumference of work piece, the width of plate slab that namely needs mills limit and milling bevel for welding and the flaw detection of steel plate inspection machine to the work piece of slab shape, the work piece of the finished product slab shape after 8 flaw detections of steel plate inspection machine are qualified is sent into the steel pipe forming unit through lifting platform 9, the work piece of the steel tubular after 10 moulding of steel pipe forming unit is sent into 11 pairs of work pieces of welder and is imposed straight seam welding, ironing and seam inspection inspection, installing pull unit 12 in the unit of the production line production line after welder 10, the work piece that this pull unit 12 of mat drives steel tubular moves forward, and the work piece of the welded tube shape after the seam inspection passed examination is sequentially sent into annealing device 13, in cooling device 14, be transported in the board-like rigidity milling train 15 of sizing through the work piece of cooled welded tube shape and carry out the size sizing by the requirement of product standard regulation, the work piece of the finished product shape after sizing is qualified sends into by the welded tube length of customer requirements that to send on blanking rack 17 warehouse-in after scaling cutter 16 cuts off standby.
Described lifting platform 9 is the height-adjustable lifting platforms that drive by screw elevator.
Described steel pipe forming unit 10(is as shown in Figure 2) sequentially formed by the curved joggling machine 18 of sky, row-roll forming process machine 19 and board-like rigidity milling train 20; The curved joggling machine of wherein said sky 18 adopts a plurality of crimp mechanism to form; Described outer roller arrangement and interior roller are combination, row-roll forming process machine open type is comprised of outer roller arrangement, interior roller, depress roller device, lower driven roller, crossbeam, support, base and snub pulley; Described board-like rigidity milling train is comprised of Rack Body, upper horizontal roller mechanism, upper horizontal roller governor motion, slide, supporting plate, hydraulic cylinder, lower horizontal roller mechanism, lower horizontal roller governor motion, edge-on roller mechanism and edge-on roller governor motion; Described board-like rigidity milling train has adopted the board-like rigid mounting more than three to form, and its each board-like rigid mounting is comprised of Rack Body, upper horizontal roller mechanism, upper horizontal roller governor motion, slide, supporting plate, hydraulic cylinder, lower horizontal roller mechanism, lower horizontal roller governor motion, edge-on roller mechanism and edge-on roller governor motion.
Described welder (as shown in Figure 3) sequentially is comprised of bonding machine 21, ironing machine 22 and seam inspection machine 23.
Described cooling device (as shown in Figure 4) sequentially is comprised of air cooling roller-way 24 and water cooling roller channel 25.
The above; it is only the better specific embodiment of the present invention; but protection scope of the present invention is not limited to this; all are familiar with those skilled in the art in technical scope disclosed by the invention, according to technical scheme of the present invention and design of the present invention thereof be equal to replace or change all should be encompassed in protection scope of the present invention within.
Claims (6)
1. a large diameter longitudinal welded pipe production line, is characterized in that: by the large diameter longitudinal welded pipe production line of large diameter longitudinal welded pipe technological process of production installing, described large diameter longitudinal welded pipe production line is mainly by storing stand (1), feeding cart (2), uncoiler (3), level(l)ing machine (4), Shearing Butt Resistance Welder (5), kink (6), edge milling machines (7), steel plate inspection machine (8), lifting platform (9), steel pipe forming unit (10), welder (11), pull unit (12), annealing device (13), cooling device (14), the board-like rigidity milling train of sizing (15), scaling cutter (16) and blanking rack (17) form, a plurality of work pieces with the coil of strip shape that will be stored in storing stand (1) are transported on uncoiler (3) by feeding cart (2), pinch mechanism by level(l)ing machine (4) is sent the upper work piece with the steel shape of decontroling of uncoiler (3) into level(l)ing machine (4) and is carried out leveling, with the forward and backward work piece with the steel shape after leveling by Shearing Butt Resistance Welder (5) integrally welded, for the work piece of the slab shape of continuous production, by the pinch mechanism of kink (6), the work piece of slab shape is rolled up subsequently and be stored on kink (6), the work piece of the slab shape on kink (6) is sent into edge milling machines (7) through the outlet of kink (6), edge milling machines (7) is just according to the circumference of work piece, the width of plate slab that namely needs mills limit and milling bevel for welding and steel plate inspection machine (8) flaw detection to the work piece of slab shape, the work piece of the finished product slab shape after steel plate inspection machine (8) flaw detection is qualified is sent into steel pipe forming unit (10) through lifting platform (9), the work piece of the steel tubular after the steel tube shaping machine composing type is sent into welder (11) work piece is imposed straight seam welding, ironing and seam inspection inspection, install pull unit (12) in the unit of the production line after welder (1), the work piece that this pull unit of mat (12) drives steel tubular moves forward, and the work piece of the welded tube shape after the seam inspection passed examination is sequentially sent into annealing device (13), in cooling device (14), be transported in the board-like rigidity milling train of sizing (15) through the work piece of cooled welded tube shape and carry out the size sizing by the requirement of product standard regulation, the work piece of the finished product shape after sizing is qualified sends into by the welded tube length of customer requirements that to send into the upper warehouse-in of blanking rack (17) after scaling cutter (16) cuts off standby.
2. by large diameter longitudinal welded pipe production line claimed in claim 1, it is characterized in that: described lifting platform (9) is the height-adjustable lifting platform (9) that drives by screw elevator.
3. by large diameter longitudinal welded pipe production line claimed in claim 1, it is characterized in that: described steel pipe forming unit (10) sequentially is comprised of the curved joggling machine of sky (18), row-roll forming process machine (19) and board-like rigidity milling train (20).
4. by large diameter longitudinal welded pipe production line claimed in claim 1, it is characterized in that: described welder (11) sequentially is comprised of bonding machine (21), ironing machine (22) and seam inspection machine (23).
5. by large diameter longitudinal welded pipe production line claimed in claim 1, it is characterized in that: described pull unit (12) is comprised of motor, reduction gearing mechanism.
6. by large diameter longitudinal welded pipe production line claimed in claim 1, it is characterized in that: described cooling device (14) sequentially is comprised of air cooling roller-way (24) and water cooling roller channel (25).
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010571178 CN102000716B (en) | 2010-11-30 | 2010-11-30 | Production line of major diameter straight welded pipe |
| DE112011103968.9T DE112011103968B4 (en) | 2010-11-30 | 2011-03-23 | Production line for a longitudinally welded tube with a large diameter |
| RU2013129913/02A RU2563394C2 (en) | 2010-11-30 | 2011-03-23 | Line for production of longitudinal weld large-diameter tubes |
| JP2013541183A JP5723020B2 (en) | 2010-11-30 | 2011-03-23 | Large diameter straight seam welded pipe production line |
| US13/989,228 US9266161B2 (en) | 2010-11-30 | 2011-03-23 | Production line of large diameter longitudinal welded pipe |
| PCT/CN2011/072062 WO2012071836A1 (en) | 2010-11-30 | 2011-03-23 | Production line of large diameter straight seam welded pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010571178 CN102000716B (en) | 2010-11-30 | 2010-11-30 | Production line of major diameter straight welded pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102000716A CN102000716A (en) | 2011-04-06 |
| CN102000716B true CN102000716B (en) | 2013-05-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201010571178 Expired - Fee Related CN102000716B (en) | 2010-11-30 | 2010-11-30 | Production line of major diameter straight welded pipe |
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| Country | Link |
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| CN (1) | CN102000716B (en) |
Families Citing this family (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102303229B (en) * | 2011-08-02 | 2014-09-24 | 太原华科信冶金成套设备有限公司 | Continuous feeding method and device |
| CN102328206B (en) * | 2011-08-17 | 2013-06-12 | 高宇笙 | All-in-one machine capable of automatically guiding materials, shearing and butting |
| CN103394546B (en) * | 2013-08-21 | 2015-06-03 | 武汉钢铁(集团)公司 | Production method for longitudinal welded pipe |
| CN103801583B (en) * | 2014-02-13 | 2016-04-13 | 风范绿色建筑（常熟）有限公司 | Large gauge directly becomes square tube processing technology |
| CN103934639B (en) * | 2014-04-19 | 2016-07-06 | 长春市矩型焊管有限责任公司 | A kind of thin-walled cold-bending molding technology |
| CN104625645B (en) * | 2015-01-13 | 2017-02-22 | 江苏中海重型机床有限公司 | Machining method for thin-wall squared tube |
| CN104875022B (en) * | 2015-04-28 | 2017-06-13 | 上海福滔金属制造有限公司 | Steel plastic compount bucket steel construction outer packing equipment production line and its production method |
| CN105127236A (en) * | 2015-08-18 | 2015-12-09 | 马鞍山市华科实业有限公司 | Manufacturing method for special-shaped steel pipes special for logistics shelves |
| CN106239168A (en) * | 2016-08-01 | 2016-12-21 | 葫芦岛市钢管工业有限公司 | A kind of pre-soldering method of the ERW for LSAW steel pipe's production |
| CN106180307B (en) * | 2016-08-31 | 2018-03-27 | 江苏省南扬机械制造有限公司 | Flexible roll bending formation production line |
| CN106541253A (en) * | 2017-01-18 | 2017-03-29 | 浙江鑫桦钢管有限公司 | A kind of production technology of steel pipe |
| CN111974820A (en) * | 2020-06-04 | 2020-11-24 | 中山玖美塑胶制品有限公司 | Equipment for manufacturing superfine seamless metal pipe |
| CN111774884B (en) * | 2020-08-12 | 2024-08-16 | 云南通海方圆工贸有限公司 | Spiral welded pipe production line |
| CN112917173B (en) * | 2021-02-03 | 2022-02-01 | 青岛沃明钢管有限公司 | Production line of high-frequency straight welded pipe |
| CN113084459B (en) * | 2021-04-13 | 2023-04-21 | 中钢不锈钢管业科技山西有限公司 | Continuous intelligent forming process for stainless steel straight welded pipe |
| CN113695841B (en) * | 2021-07-08 | 2022-07-08 | 江苏武进不锈股份有限公司 | Method for manufacturing composite welding austenitic stainless steel pipe for fluid transportation |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19734780C1 (en) * | 1997-08-06 | 1998-12-10 | Mannesmann Ag | Method for producing welded copper and copper alloy pipes |
| CN2355829Y (en) * | 1998-12-31 | 1999-12-29 | 无锡市永大企业制造有限公司 | Drawbar |
| CN201950087U (en) * | 2010-11-30 | 2011-08-31 | 大连三高科技发展有限公司 | Large-diameter longitudinal welded pipe production line |
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- 2010-11-30 CN CN 201010571178 patent/CN102000716B/en not_active Expired - Fee Related
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