CN102581530A - Three-way connector and laser electric-arc composite welding torch - Google Patents
Three-way connector and laser electric-arc composite welding torch Download PDFInfo
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- CN102581530A CN102581530A CN2012100802037A CN201210080203A CN102581530A CN 102581530 A CN102581530 A CN 102581530A CN 2012100802037 A CN2012100802037 A CN 2012100802037A CN 201210080203 A CN201210080203 A CN 201210080203A CN 102581530 A CN102581530 A CN 102581530A
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Abstract
The invention discloses a three-way connector and a laser electric-arc composite welding torch, which belong to the technical field of welding tools. The three-way connector comprises a first adjusting part, a second adjusting part and a third adjusting part. The laser electric-arc composite welding torch comprises a first connector, a second connector, the three-way connector, a laser welding gun, an electric-arc welding gun and a servo tracking mechanism. The invention further discloses a laser electric-arc composite welding device on the basis of the laser electric-arc composite welding torch. The three-way connector can move vertically and bilaterally and rotate by a certain angle through the electric-arc welding torch connected with the three-way connector externally; the laser welding gun of the laser electric-arc composite welding torch can move vertically bilaterally and rotate by a certain angle through the three-way connector, so that a gap and an included angle between a laser beam and a welding wire can be adjusted, synergistic effect between the laser and the welding wire can be achieved optimally, and welding efficiency and quality can be guaranteed.
Description
Technical field
The present invention relates to the soldering appliance technical field, particularly a kind of can make by its arc torch that externally connects can about, about, the three-dimensional connector that moves of rotation and the laser-arc hybrid welding process torch that is used for the full position of oil and gas pipeline hybrid Laser-Arc Welding device that externally connects by this three-dimensional connector.
Background technology
For increasing the oil gas conveying capacity; The immense pressure that the energy demand that alleviating China increases day by day brings; Long oil and gas pipeline develops towards high grade of steel, high pressure, heavy caliber, heavy wall direction; And existing solder technology and equipment are difficult to satisfy the requirement to efficiency of construction of high grade of steel, the long oil and gas pipeline of heavy caliber, are seriously restricting the pipeline construction progress, increase construction cost.How to improve grade of steel, the long oil and gas pipeline efficiency of construction of heavy caliber, become the focal issue that unit in charge of construction pays close attention to the most.
As everyone knows, the most important thing of pipe-line construction is pipeline welding, and the speed of pipeline welding and quality have determined the progress and the quality of engineering.At the pipeline all-position automatic welding technique and the equipment of usefulness, because of receiving the restriction of speed of welding and individual layer throat thickness, difficult degree improves welding efficiency at present.Under this sight, pipeline all-position laser-arc hybrid welding process technology is arisen at the historic moment, for the pipe-line construction engineering in the misfortune has been brought the dawn of hoping.Pipeline laser/electric arc hybrid welding technology; Advantages such as the speed of welding bridging capability of arc welding is strong and Laser Welding is fast, fusion penetration is big combine together; The form a team deficiencies such as poor impact toughness of required precision height, weld seam of the mouth of pipe when conventional arc of can forgoing welding technology can't rely on and improve bonding power and obtain bigger fusion penetration and Geng Gao speed of welding and pure Laser Welding and be used for the pipe line steel welding can solve a difficult problem that has the welding aspect that exists in the pipe-line construction now well.
Existing hybrid Laser-Arc Welding device comprises dolly, track and compound welding torch, and wherein, compound welding torch comprises laser welding gun, arc welding gun and tracking follower; Laser welding gun, arc welding gun and tracking follower connect into as a whole formation welding torch; Welding torch is connected in dolly, and tooth bar on the track and the gears engaged on the dolly can be adjusted the position of dolly through the position of adjustment track; And then the position of follower is followed the tracks of in adjustment; When the tracking wheel of following the tracks of follower and pipe welding seam were fitted fully, laser welding gun and arc welding gun and pipe welding seam centering got final product butt welded seam at this moment and weld.When using this hybrid Laser-Arc Welding device, the spacing and the angle of laser beam that is sent by the laser welding gun and the welding wire that sent by arc welding gun make the cooperative effect between laser beam and welding wire be difficult to adjustment, and then make welding efficiency and difficult quality be guaranteed.
Summary of the invention
In order to address the above problem; The present invention proposes a kind of can make by its arc torch that externally connects can about, the three-dimensional connector of move left and right, the anglec of rotation; Provide a kind of oil and gas pipeline that is used for that externally connects by this three-dimensional connector directly to weld simultaneously; Thereby regulate spacing, angle between laser beam and the welding wire, make the cooperative effect between laser beam and welding wire reach best, and then guarantee the laser-arc hybrid welding process torch of welding efficiency and quality.
Three-dimensional connector provided by the invention comprises I adjustment component, II adjustment component and III adjustment component,
Said I adjustment component comprises vertical adjustment piece and horizontal concrete chute, and the both sides of said vertical adjustment piece offer vertical adjustment groove respectively, and said horizontal concrete chute is connected in said vertical adjustment piece, and said vertical adjustment piece externally connects through said vertical adjustment groove,
Said II adjustment component comprises transverse slider, dead eye and rotation adjustment ring; Said dead eye is fixedly connected on said transverse slider; Said rotation adjustment ring set is located on the said dead eye; Radially be provided with teeth groove on the said rotation adjustment ring, said transverse slider can slide in said horizontal concrete chute
Said III adjustment component comprises bearing locating shaft, turn adjustment piece and positioning of rotating arm, and said turn adjustment piece center offers through hole, and said turn adjustment piece and said positioning of rotating arm are fixedly connected on respectively on the said bearing locating shaft,
Said bearing locating shaft is arranged in the said dead eye through bearing, makes said bearing locating shaft in said dead eye, rotating under the drive of said bearing,
The free end of said positioning of rotating arm has shackle member, and said shackle member comprises sliding sash, elastomeric element and tooth piece, and an end of said tooth piece has teeth; The other end of said tooth piece is blocked in the said sliding sash by separated; Said elastomeric element is arranged in the said sliding sash, and an end of said elastomeric element is resisted against said sliding sash wall, and the other end of said elastomeric element is resisted against said tooth piece; When said elastomeric element is compressed into the limit; Said teeth are incorporated in the said sliding sash, and when said teeth were stretched out from said sliding sash, said teeth can be placed in the said teeth groove.
As preferably, offer screwed hole on the said horizontal concrete chute, can said transverse slider be fixed in the said horizontal concrete chute through the screw that is arranged in the said screwed hole.
As preferably, said elastomeric element is a spring.
A kind of laser-arc hybrid welding process torch provided by the invention comprises the I connector, the II connector, and said three-dimensional connector, the laser welding gun, arc welding gun, the servo-actuated follower,
Said laser welding gun is connected in said I connector through said II connector, said II connector with make said laser welding gun to move up and down being connected of said I connector,
Said arc welding gun is arranged in the said through hole, and said three-dimensional connector externally is connected in said I connector through said vertical adjustment groove, said three-dimensional connector make said arc welding gun can about, move left and right, the anglec of rotation,
Said servo-actuated follower is fixedly connected on said I connector.
As preferably; The position that is connected with said II connector on the said I connector is placed with at least two row screwed holes from top to bottom; Said II connector is provided with and the corresponding screwed hole of said screwed hole, and said II connector and said I connector link together through corresponding screwed hole and bolt.
As preferably; Being provided with the junction of said vertical adjustment groove on the said I connector to indicate said arc welding gun to move up and down the dial of displacement; Said horizontal concrete chute is provided with the dial that can indicate the displacement of said arc welding gun move left and right, is connected with the dial that can indicate the said arc welding gun anglec of rotation on the outer wall of said dead eye.
Hybrid Laser-Arc Welding device provided by the invention comprises dolly, track and said laser-arc hybrid welding process torch; Said laser-arc hybrid welding process torch is connected in said dolly; Gears engaged on tooth bar on the said track and the said dolly; Can adjust the position of said dolly through the position of adjusting said track, and then adjust the position of the tracking follower of said laser-arc hybrid welding process torch, when the tracking wheel of said tracking follower and pipe welding seam are fitted fully; The laser welding gun of said laser-arc hybrid welding process torch and arc welding gun and pipe welding seam centering, the butt welded seam welding.
The beneficial effect of laser-arc hybrid welding process torch provided by the invention is:
Three-dimensional connector provided by the invention can make by its arc torch that externally connects can about, move left and right, the anglec of rotation; The laser welding gun of laser-arc hybrid welding process torch provided by the invention can move up and down; Arc welding gun by this three-dimensional connector can about, move left and right, the anglec of rotation; Can make spacing and angle between laser beam and the welding wire obtain adjustment; Thereby make the cooperative effect between laser beam and welding wire reach best, and then guarantee welding efficiency and quality.
Description of drawings
The general structure sketch map of the three-dimensional connector that Fig. 1 provides for the embodiment of the invention;
The I adjustment component perspective view of the three-dimensional connector that Fig. 2 provides for the embodiment of the invention;
The II adjustment component perspective view of the three-dimensional connector that Fig. 3 provides for the embodiment of the invention;
The III adjustment component perspective view of the three-dimensional connector that Fig. 4 provides for the embodiment of the invention;
The free-ended sectional structure sketch map of positioning of rotating arm of the three-dimensional connector that Fig. 5 provides for the embodiment of the invention;
The perspective view of the laser-arc hybrid welding process torch that Fig. 6 provides for the embodiment of the invention;
The main TV structure sketch map of the laser-arc hybrid welding process torch that Fig. 7 provides for the embodiment of the invention;
The laser-arc hybrid welding process torch that Fig. 8 provides for the embodiment of the invention is with dolly, track with the perspective view after pipeline is connected;
The laser-arc hybrid welding process torch that Fig. 9 provides for the embodiment of the invention is with dolly, track with the main TV structure sketch map after pipeline is connected;
The laser-arc hybrid welding process torch that Figure 10 provides for the embodiment of the invention is being applied to the hybrid Laser-Arc Welding device and with dolly, track with the perspective view after pipeline is connected.
The specific embodiment
In order to understand the present invention in depth, the present invention is elaborated below in conjunction with accompanying drawing and specific embodiment.
Referring to accompanying drawing 1～accompanying drawing 4, three-dimensional connector provided by the invention comprises I adjustment component, II adjustment component and III adjustment component.
Comprise vertical adjustment piece 16 and horizontal concrete chute 23 referring to accompanying drawing 2, the I adjustment component, the both sides of vertically adjusting piece 16 offer vertical adjustment groove 21 respectively, and horizontal concrete chute 23 is connected in vertical adjustment piece 16, vertically adjust piece 16 and externally connect through vertically adjusting groove 21.
Referring to accompanying drawing 3; The II adjustment component comprises transverse slider 18, dead eye 28 and rotation adjustment ring 35; Dead eye 28 is fixedly connected on transverse slider 18, and rotation adjustment ring 35 is sheathed on the dead eye 28, radially is provided with teeth groove 27 on the rotation adjustment ring 35; Referring to accompanying drawing 1, transverse slider 18 can slide in horizontal concrete chute 23.
Referring to accompanying drawing 4; The III adjustment component comprises bearing locating shaft 31, turn adjustment piece 30 and positioning of rotating arm 29; Referring to accompanying drawing 4, turn adjustment piece 20 centers offer through hole 30, and turn adjustment piece 20 is fixedly connected on respectively on the bearing locating shaft 31 with positioning of rotating arm 29.
Referring to accompanying drawing 1, bearing locating shaft 31 is sheathed in the dead eye 28 through bearing 19, makes that bearing locating shaft 31 can be in rotation in dead eye 28 under the drive of bearing 19.
Referring to accompanying drawing 5, the free end of positioning of rotating arm 29 has shackle member 37, and shackle member 37 comprises sliding sash 33, elastomeric element 32 and tooth piece 34; One end of tooth piece 34 has teeth 36, and the other end of tooth piece 34 is blocked in the sliding sash 33 by separated, and elastomeric element 32 is arranged in the sliding sash 33; One end of elastomeric element 32 is resisted against sliding sash 33 walls, and the other end of elastomeric element 32 is resisted against tooth piece 34, when elastomeric element 32 is compressed into the limit; Teeth 36 are incorporated in the sliding sash 33; Referring to accompanying drawing 1, when teeth 36 were stretched out from sliding sash 33, teeth 36 can be placed in the teeth groove 27.This three-dimensional connector can move up and down through the mobile of vertical adjustment groove 21 of external connection, through the slip move left and right of horizontal concrete chute 23, through the rotation anglec of rotation of bearing locating shaft 31; When needs during to bearing locating shaft 31 anglecs of rotation, push teeth 36, make elastomeric element 32 be compressed into extreme position; At this moment, teeth 36 are incorporated in the sliding sash 33, and bearing locating shaft 31 is in rotation in dead eye 28 under the drive of bearing 19; When bearing locating shaft 31 rotates to suitable position, decontrol teeth 36, elastomeric element 32 elongations; Teeth 36 are stretched out from sliding sash 33, make teeth 36 be placed in the teeth groove 27.
Wherein, as a kind of concrete implementation of elastomeric element 32, elastomeric element 32 can be spring.
Referring to accompanying drawing 2, offer screwed hole 22 on the horizontal concrete chute 23, referring to accompanying drawing 1, can transverse slider 18 be fixed in the horizontal concrete chute 23 better through the screw 17 that is arranged in the screwed hole 22.
Referring to accompanying drawing 6 and accompanying drawing 7, comprise I connector 10, the II connectors 16, three-dimensional connector 11, laser welding gun 9, arc welding gun 14, servo-actuated follower 15.
Referring to accompanying drawing 1 and accompanying drawing 6, arc welding gun 14 is arranged in the through hole 30, and three-dimensional connector 11 externally is connected in I connector 10 through vertical adjustment groove 21, three-dimensional connector 11 make arc welding gun 14 can about, move left and right, the anglec of rotation.
Servo-actuated follower 15 is fixedly connected on I connector 10.
Also be connected in the dolly 5 of hybrid Laser-Arc Welding device referring to accompanying drawing 8 and accompanying drawing 9, the I connectors 10.
Wherein, Referring to accompanying drawing 6; As on the I connector 10 with a kind of concrete connected mode of II connector 16; The position that is connected with II connector 16 on the I connector 10 can be placed with at least two row screwed holes from top to bottom; The position that connects with I connector 10 on the II connector 16 can be provided with can with the screwed hole that is arranged at the corresponding setting of two row screwed holes on the I connector 10, II connector 16 and I connector 10 link together through corresponding screwed hole and bolt.
Wherein, Referring to accompanying drawing 6 and accompanying drawing 7; On the I the connector 10 and junction of vertical adjustment groove 21 is provided with can indicate arc welding gun 14 to move up and down the dial 17 of displacement, and referring to accompanying drawing 1 and accompanying drawing 2, horizontal concrete chute 23 is provided with the dial 13 that can indicate arc welding gun 14 move left and right displacements; Referring to accompanying drawing 1, accompanying drawing 3 accompanying drawings 6 and accompanying drawing 7; Be connected with the dial 12 that can indicate arc welding gun 14 anglecs of rotation on the outer wall of dead eye 28, thereby, make that the displacement of arc welding gun about in the of 14, move left and right and the angle of rotation can be measured exactly.
Referring to accompanying drawing 6～9; Hybrid Laser-Arc Welding device provided by the invention comprises dolly 5, track 7 and welding torch 4; Welding torch 4 is connected in dolly 5 through I connector 10, and the gears engaged on tooth bar on the track 7 and the dolly 5 can be adjusted the position of dolly 5 through the position of adjustment track 7; And then the position of follower 15 is followed the tracks of in adjustment; When the tracking wheel of following the tracks of follower 15 18 is fitted with the weld seam 8 of pipeline 6 fully, laser welding gun 9 and weld seam 8 centerings of arc welding gun 14 with pipeline 6, this moment can butt welded seam 8 weldings.
Referring to accompanying drawing 10, control system 1 controls arc welder 2 and laser instrument 3 respectively, and arc welder 2 is further controlled arc welding gun 14, and laser instrument is further controlled laser welding gun 9.
Referring to accompanying drawing 2, three-dimensional connector 11 provided by the invention can make by its arc torch 14 that externally connects can about, about, rotation moves; The laser welding gun 9 of laser-arc hybrid welding process torch provided by the invention can move up and down; Arc welding gun 14 by this three-dimensional connector 11 can about, move left and right, the anglec of rotation; Can make spacing d and angle between laser beam and the welding wire obtain adjustment; Thereby make the cooperative effect between laser beam and welding wire reach best, and then guarantee welding efficiency and quality.
The above-described specific embodiment; The object of the invention, technical scheme and beneficial effect have been carried out further explain, and institute it should be understood that the above is merely the specific embodiment of the present invention; Be not limited to the present invention; All within spirit of the present invention and principle, any modification of being made, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. a three-dimensional connector is characterized in that, comprises I adjustment component, II adjustment component and III adjustment component,
Said I adjustment component comprises vertical adjustment piece and horizontal concrete chute, and the both sides of said vertical adjustment piece offer vertical adjustment groove respectively, and said horizontal concrete chute is connected in said vertical adjustment piece, and said vertical adjustment piece externally connects through said vertical adjustment groove,
Said II adjustment component comprises transverse slider, dead eye and rotation adjustment ring; Said dead eye is fixedly connected on said transverse slider; Said rotation adjustment ring set is located on the said dead eye; Radially be provided with teeth groove on the said rotation adjustment ring, said transverse slider can slide in said horizontal concrete chute
Said III adjustment component comprises bearing locating shaft, turn adjustment piece and positioning of rotating arm, and said turn adjustment piece center offers through hole, and said turn adjustment piece and said positioning of rotating arm are fixedly connected on respectively on the said bearing locating shaft,
Said bearing locating shaft is arranged in the said dead eye through bearing, makes said bearing locating shaft in said dead eye, rotating under the drive of said bearing,
The free end of said positioning of rotating arm has shackle member, and said shackle member comprises sliding sash, elastomeric element and tooth piece, and an end of said tooth piece has teeth; The other end of said tooth piece is blocked in the said sliding sash by separated; Said elastomeric element is arranged in the said sliding sash, and an end of said elastomeric element is resisted against said sliding sash wall, and the other end of said elastomeric element is resisted against said tooth piece; When said elastomeric element is compressed into the limit; Said teeth are incorporated in the said sliding sash, and when said teeth were stretched out from said sliding sash, said teeth can be placed in the said teeth groove.
2. three-dimensional connector according to claim 1 is characterized in that, offers screwed hole on the said horizontal concrete chute, can said transverse slider be fixed in the said horizontal concrete chute through the screw that is arranged in the said screwed hole.
3. three-dimensional connector according to claim 1 is characterized in that, said elastomeric element is a spring.
4. a laser-arc hybrid welding process torch is characterized in that, comprises the I connector, the II connector, and arbitrary described three-dimensional connector in the claim 1～3, the laser welding gun, arc welding gun, the servo-actuated follower,
Said laser welding gun is connected in said I connector through said II connector, said II connector with make said laser welding gun to move up and down being connected of said I connector,
Said arc welding gun is arranged in the said through hole, and said three-dimensional connector externally is connected in said I connector through said vertical adjustment groove, said three-dimensional connector make said arc welding gun can about, move left and right, the anglec of rotation,
Said servo-actuated follower is fixedly connected on said I connector.
5. laser-arc hybrid welding process torch according to claim 4; It is characterized in that; The position that is connected with said II connector on the said I connector is placed with at least two row screwed holes from top to bottom; Said II connector is provided with and the corresponding screwed hole of said screwed hole, and said II connector and said I connector link together through corresponding screwed hole and bolt.
6. laser-arc hybrid welding process torch according to claim 4; It is characterized in that; Being provided with the junction of said vertical adjustment groove on the said I connector to indicate said arc welding gun to move up and down the dial of displacement; Said horizontal concrete chute is provided with the dial that can indicate the displacement of said arc welding gun move left and right, is connected with the dial that can indicate the said arc welding gun anglec of rotation on the outer wall of said dead eye.
7. hybrid Laser-Arc Welding device; It is characterized in that comprise arbitrary described laser-arc hybrid welding process torch in dolly, track and the claim 4～6, said laser-arc hybrid welding process torch is connected in said dolly; Gears engaged on tooth bar on the said track and the said dolly; Can adjust the position of said dolly through the position of adjusting said track, and then adjust the position of the tracking follower of said laser-arc hybrid welding process torch, when the tracking wheel of said tracking follower and pipe welding seam are fitted fully; The laser welding gun of said laser-arc hybrid welding process torch and arc welding gun and pipe welding seam centering, the butt welded seam welding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210080203.7A CN102581530B (en) | 2012-03-23 | 2012-03-23 | Three-way connector,laser electric-arc composite welding torch, and welding device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210080203.7A CN102581530B (en) | 2012-03-23 | 2012-03-23 | Three-way connector,laser electric-arc composite welding torch, and welding device |
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| CN102581530A true CN102581530A (en) | 2012-07-18 |
| CN102581530B CN102581530B (en) | 2014-11-05 |
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| CN201210080203.7A Active CN102581530B (en) | 2012-03-23 | 2012-03-23 | Three-way connector,laser electric-arc composite welding torch, and welding device |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102785033A (en) * | 2012-08-24 | 2012-11-21 | 无锡汉神电气有限公司 | Laser and electric arc hybrid welding torch based on three-dimensional regulation |
| CN102909457A (en) * | 2012-09-26 | 2013-02-06 | 安徽维德精密机电设备有限公司 | Precision welding machine |
| CN103753062A (en) * | 2013-12-27 | 2014-04-30 | 河南中烟工业有限责任公司 | Special pipe welding device |
| CN105149743A (en) * | 2015-09-07 | 2015-12-16 | 昆山华恒焊接股份有限公司 | Welding tracking device for pipe fittings |
| CN106181041A (en) * | 2015-04-30 | 2016-12-07 | 中国石油天然气集团公司 | Hybrid Laser-Arc Welding device and there is its pipeline welding device |
| CN106695123A (en) * | 2016-12-19 | 2017-05-24 | 中国矿业大学 | Laser filler wire welding gun adjusting mechanism |
| CN106808043A (en) * | 2017-03-21 | 2017-06-09 | 无锡奥特维智能装备有限公司 | Angular adjustment apparatus |
| CN107755912A (en) * | 2017-10-26 | 2018-03-06 | 重庆科技学院 | Tubing all positon hybrid Laser-Arc Welding system |
| CN108489651A (en) * | 2018-03-14 | 2018-09-04 | 中国石油大学(华东) | Multi-angle corner weld residual stress tests centralising device |
| CN115246029A (en) * | 2022-09-22 | 2022-10-28 | 江苏泽润新材料有限公司 | Device for preventing photovoltaic solder strip from being welded |
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| CN102909457A (en) * | 2012-09-26 | 2013-02-06 | 安徽维德精密机电设备有限公司 | Precision welding machine |
| CN103753062A (en) * | 2013-12-27 | 2014-04-30 | 河南中烟工业有限责任公司 | Special pipe welding device |
| CN106181041A (en) * | 2015-04-30 | 2016-12-07 | 中国石油天然气集团公司 | Hybrid Laser-Arc Welding device and there is its pipeline welding device |
| CN105149743A (en) * | 2015-09-07 | 2015-12-16 | 昆山华恒焊接股份有限公司 | Welding tracking device for pipe fittings |
| CN106695123A (en) * | 2016-12-19 | 2017-05-24 | 中国矿业大学 | Laser filler wire welding gun adjusting mechanism |
| CN106808043A (en) * | 2017-03-21 | 2017-06-09 | 无锡奥特维智能装备有限公司 | Angular adjustment apparatus |
| CN107755912A (en) * | 2017-10-26 | 2018-03-06 | 重庆科技学院 | Tubing all positon hybrid Laser-Arc Welding system |
| CN108489651A (en) * | 2018-03-14 | 2018-09-04 | 中国石油大学(华东) | Multi-angle corner weld residual stress tests centralising device |
| CN108489651B (en) * | 2018-03-14 | 2020-08-04 | 中国石油大学(华东) | Multi-angle fillet weld residual stress test centering device |
| CN115246029A (en) * | 2022-09-22 | 2022-10-28 | 江苏泽润新材料有限公司 | Device for preventing photovoltaic solder strip from being welded |
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|---|---|
| CN102581530B (en) | 2014-11-05 |
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Effective date of registration: 20170301 Address after: 100007 Dongcheng District, Dongzhimen, China, North Street, No. 9 Oil Mansion, No. Patentee after: China National Petroleum Corporation Patentee after: China Petroleum Pipeline Bureau Engineering Co., Ltd. Address before: 100007 Dongcheng District, Dongzhimen, China, North Street, No. 9 Oil Mansion, No. Patentee before: China National Petroleum Corporation Patentee before: China Petroleum and Natural Gas Pipeline Bureau |