CN103567617B - Stainless steel curb wall is hold down gag, mash welder and welding procedure for indirect welding - Google Patents

Stainless steel curb wall is hold down gag, mash welder and welding procedure for indirect welding Download PDF

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Publication number
CN103567617B
CN103567617B CN201210272039.XA CN201210272039A CN103567617B CN 103567617 B CN103567617 B CN 103567617B CN 201210272039 A CN201210272039 A CN 201210272039A CN 103567617 B CN103567617 B CN 103567617B
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China
Prior art keywords
gag
hold
reservoir
crossbeam
jig
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CN201210272039.XA
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CN103567617A (en
Inventor
高岩
安福军
孙红霞
云增波
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CRRC Qingdao Sifang Co Ltd
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CRRC Qingdao Sifang Co Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K11/00Resistance welding; Severing by resistance heating
    • B23K11/10Spot welding; Stitch welding
    • B23K11/11Spot welding
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K11/00Resistance welding; Severing by resistance heating
    • B23K11/36Auxiliary equipment
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K37/00Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
    • B23K37/04Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work
    • B23K37/0426Fixtures for other work
    • B23K37/0435Clamps
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2103/00Materials to be soldered, welded or cut
    • B23K2103/02Iron or ferrous alloys
    • B23K2103/04Steel or steel alloys

Abstract

The present invention relates to a kind of stainless steel curb wall hold down gag, mash welder and welding procedure for indirect welding, comprise welding machine portal frame, for placing jig and the spot-wedling electrode of side wall to be welded, on described jig, be provided with hold down gag, hold down gag comprises two columns that are divided into jig both sides, is across the crossbeam that described jig top connects two described columns, on described crossbeam, be provided with multiplely for compressing the compressing member of described side wall, described column is connected with described jig is removable. The present invention utilizes hold down gag that skeleton and wallboard entirety are compressed, make skeleton and wallboard outerplanar and platform closely connected, utilize reservoir pressure that workpiece wave transformation is eliminated, spot welding rear wall plate and skeleton form entirety, self rigidity strengthens, discharge after thrust, it is smooth that outer surface still can keep, and improves flatness.<!--1-->

Description

Stainless steel curb wall is hold down gag, mash welder and welding procedure for indirect welding
Technical field
The invention belongs to welder technical field, relate to a kind of stainless steel curb wall hold down gag, point for indirect weldingWelding machine and welding procedure.
Background technology
Stainless steel material is a kind of clean, environmental protection, durable, high strength, erosion-resisting excellent material, in railcarOn car body, widely apply, because of its special physical property feature, the larger distortion of as easy as rolling off a log generation after welding; AndExisting steel structure of car body side wall generally adopts slab and girder, and Side fascia and beam column use austenite stainless steel plate to be cold-pressed intoType, utilizes indirect welding equipment spot welding moulding.
Figure mono-: prior art jig structure chart.
As shown in figure mono-, in pinpoint welding procedure, side wall unit is in a freedom without restrained condition. Due to wallboard materialMaterial exists certain wave transformation, unit skeleton to be also difficult to reach definitely smooth state, pointwise point under this stateWeldering, can there is larger wave transformation in side wall unit outer surface. Utilize the large-sized sheet material of welder to other materialsCarry out in welding process with other structures, also there will be sheet material cannot reach flatness requirement, or occur after weldingThe phenomenon of larger modification, serious, the phenomenon that meeting cause solder joint to ftracture because of modification stress.
Summary of the invention
Main purpose of the present invention is to address the above problem and is not enough, provides a kind of simple in structure, can effectively eliminateWorkpiece wave transformation, the stainless steel curb wall indirect welding hold down gag of raising welded workpiece flatness and rigidity.
Another main purpose of the present invention is, provides a kind of simple in structure, can effectively eliminate workpiece wave and becomeShape, the mash welder of raising welded workpiece flatness and rigidity.
Another main purpose of the present invention is, provides one can effectively eliminate workpiece wave transformation, improves welderingConnect the welding procedure of rear workpiece flatness and rigidity.
For achieving the above object, technical scheme of the present invention is:
A kind of stainless steel car body side wall single-side spot welding hold down gag, comprises that two are divided into the vertical of jig both sidesPost, be across the crossbeam that described jig top connects two described columns, on described crossbeam, be provided with multipleFor compressing the compressing member of described side wall; The both sides of described jig are respectively equipped with track base, on described track baseLinear guides is installed, and described column lower end inner side is near the built-in guide rail slide block in described jig place, described guide railSlide block is embedded in described linear guides, moves along described linear guides; On described column, be provided with two bearings,Described bearing is relatively set with pin-and-hole, in described pin-and-hole, inserts locating detent, and described locating detent is positioned at described crossbeamThe top of end.
Further, described column inside is provided with lifting reservoir, and the two ends of described crossbeam and described lifting reservoir are solidFixed connection.
Further, described compressing member is by compressing reservoir and reservoir pressure head forms, described compression reservoir by pipeline withWind regime connects, and is serially connected with wind regime distributing valve in described pipeline, and described compression reservoir is slidably connected with described crossbeam,Arbitrarily regulate the position that compresses point, the action of described compression reservoir is by the control of reservoir control valve, described wind regime distributing valveBe arranged on described column with reservoir control valve.
Further, described pipeline comprises that wind path house steward and many wind paths are in charge of, and described wind path house steward is provided with multipleAir outlet, described wind path is in charge of one end and described air outlet is fixedly connected to form air-out path, the other end and described pressureTight reservoir connects, and described allocation of the amount of air valve is serially connected on described wind path house steward.
Further, described crossbeam is hollow structure, and described pipeline and described compression reservoir are arranged in described crossbeam,Be provided with elongated open slot in the bottom of described crossbeam, described reservoir pressure head is from the open slot of described crossbeam bottomStretch out.
Further, described crossbeam is made up of stainless steel tube.
Another technical scheme of the present invention is:
A kind of mash welder, comprises welding machine portal frame, for placing jig and the spot-wedling electrode of side wall to be welded,On described jig, be provided with above-mentioned hold down gag.
Another technical scheme of the present invention is:
Side wall to be welded is placed on the jig of mash welder;
After side wall is in place, controls crossbeam and drop to the position that can compress side wall, locating detent is inserted into and is propped upIn the pin-and-hole of seat, horizontal depth of beam is fixed;
Utilize hold down gag that a certain side wall bond pad locations that transversely needs spot welding is carried out to entirety compression, use side wallSkeleton and wallboard outer surface and described jig are closely connected;
The solder joint being compressed by hold down gag is carried out to spot weld operation;
Unclamp hold down gag, hold down gag is adjusted to the position that next place needs spot welding, compress side wall, implement pointWeldering.
To sum up content, a kind of stainless steel curb wall of the present invention hold down gag, mash welder and welding for indirect weldingTechnique, owing to increasing and being provided with hold down gag on jig, utilizes hold down gag that skeleton and wallboard entirety are pressedTightly, make skeleton and wallboard outerplanar and platform closely connected, utilize reservoir pressure that workpiece wave transformation is eliminated, some postweldingWallboard and skeleton form entirety, and self rigidity strengthens, and discharge after thrust, and it is smooth that outer surface still can keep,Improve flatness. Hold down gag height is adjustable simultaneously, and thrust is adjustable, compresses reservoir and reservoir pressure head quantity one by oneCorrespondence, compress reservoir and reservoir pressure head quantity and relative between position or a square adjustable, make whole hold down gagCan adapt to different in width or compression demand, adapt to different welding needs. In addition, this hold down gag can initial pointOn the basis of welding machine jig, transform, reduce production costs, guiding linear guides is installed in platform both sides,Also make overall structure and the coordination of former machine, attractive in appearance, motion smoothing.
Brief description of the drawings:
Fig. 1: be prior art jig structural representation;
Fig. 2: be spot welding machine structure schematic diagram of the present invention;
Fig. 3 is the top view of Fig. 2;
Fig. 4 is hold down gag structural representation of the present invention;
Fig. 5 is that the A of Fig. 4 is to view;
Fig. 6 is that the B of Fig. 4 is to view;
Fig. 7 is the C-C cutaway view of Fig. 4.
As shown in Figures 1 to 7, welding machine portal frame 1, side wall 2, jig 3, hold down gag 4, crossbeam 5, column6, track base 7, linear guides 8, guide rail slide block 9, locating detent 10, compresses reservoir 11, reservoir pressure head 12, windCylinder control valve 13, wind regime distributing valve 14, copper platform 15, top electrode 16, auxiliary electrode 17, lifting reservoir 18,Seat 19
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in further details.
As shown in Figures 2 and 3, a kind of mash welder of the present invention, comprises welding machine portal frame 1, jig 3, compressesDevice 4 and spot-wedling electrode, the superiors of jig 3 are copper platform 15, top electrode 16 and auxiliary electrode that spot welding is used17 are fixed on welding machine portal frame 1, and auxiliary electrode 17 is connected with copper platform 15, and side wall 2 to be welded is placed on weldingOn the copper platform 15 of platform 3 the superiors, hold down gag 4 is for compressing side wall 2.
As shown in Figure 4, hold down gag 4 comprises the column 6 that is positioned at jig 3 both sides and the crossbeam that connects two columns 65, crossbeam 5, across the top of jig 3, is provided with multiple for compressing the compressing member of side wall 2 on crossbeam 5. RootAccording to the architectural feature of different automobile types side wall 2, can increase and decrease the quantity of compressing member, in the present embodiment, preferably at crossbeam 5On 11 groups of compressing members are set. 11 groups of compressing members can make the skeleton of side wall 2 and wallboard entirety compress, and make the skeleton of side wall 2Closely connected with jig 3 when the welding with the outer surface of wallboard, and then by the wave transformation elimination of side wall 2 wallboards,Under this state, complete spot welding, spot welding rear wall plate and skeleton form entirety, and self rigidity strengthens, discharge after thrust,It is smooth that outer surface still can keep, and improves flatness.
As shown in Figures 2 to 6, the both sides of jig 3 are respectively equipped with track base 7, on track base 7, linearity are installed and leadRail 8, column 6 inner sides, lower end are near the jig 3 built-in guide rail slide blocks 9 in place, and guide rail slide block 9 is embedded into linear guides 8In, guide rail slide block 9 can move along linear guides 8, drives whole hold down gag 4 along the vertically moving of side wall 2, with rootAdjust the compacted position of hold down gag 4 according to needing the position of spot welding.
As shown in Figure 5, on column 6, be provided with lifting reservoir 18, in the present embodiment, preferably lifting reservoir 18 establishedPut in the inside of column 6, the two ends of crossbeam 5 are fixedly connected on lifting reservoir 18, by controlling lifting reservoir 18Action regulates the lifting of crossbeam 5. While needing side wall 2 to be placed on jig 3, control lifting reservoir before welding18 move upward, and crossbeam 5 is risen, and reserve enough height and place side wall 2, after side wall 2 is in place, then controlLifting reservoir 18 processed moves downward, and makes crossbeam 5 drop to the position of the design that can compress side wall 2.
In the time that compression reservoir 11 compresses side wall 2, can upwards there is larger reaction force, for fear of in the time compressing, horizontal strokeBeam 5 moves up, and is provided with the position limiting structure moving up for limiting crossbeam 5 on column 6. As shown in Figure 4,What position limiting structure adopted is to extend two parallel triangle bearings 19 are set in each column 6 upward horizon directions,On two bearings 19, be relatively set with pin-and-hole, insert locating detent 10 in pin-and-hole, locating detent 10 is positioned at crossbeam 5 endsThe top of portion, the position of locating detent 10 defines the height of crossbeam 5, and therefore locating detent 10 can stop crossbeams 5Move upward. In the time that crossbeam 5 need to rise, locating detent 10 is pulled down, drop to design attitude needs at crossbeam 5, insert locating detent 10 when the location.
As shown in Figure 7, in the present embodiment, compress power and preferably adopt reservoir to compress, thrust is larger, easy to control,And stable action. Compressing member, by compressing reservoir 11 and reservoir pressure head 12 forms, compresses reservoir 11 by pipeline and windSource (not shown) connects, and compression reservoir 11 promotes reservoir pressure head 12 and moves downward, to compress the side of belowWall 2. Compress reservoir 11 and be slidably connected on crossbeam 5, so that according to the position of side wall 2 skeleton beam columns, arbitrarilyRegulate the position that compresses point.
As shown in Figure 7, crossbeam 5 is hollow structure, in order to increase bulk strength and the rigidity of crossbeam 5, crossbeam 5Preferably adopt stainless steel tube to make, the pipeline and the compression reservoir 11 that connect wind regime are all arranged in crossbeam 5. At crossbeam5 bottom is provided with elongated open slot, and reservoir pressure head 12 stretches out downwards from open slot, and every group compresses reservoir 11With reservoir pressure head 12 all can be along open slot transverse shifting.
11 compression reservoirs 11 can be connected with wind regime respectively by 11 pipelines, but in order to realize centralized ControlAnd simplified structure, in the present embodiment, the pipeline that connects wind regime comprises a wind path house steward (not shown) and 11Bar wind path is in charge of (not shown), and one end of wind path house steward is connected with wind regime, and wind path house steward's terminal is provided with 11Individual air outlet, one end and an air outlet that every wind path is in charge of are fixedly connected to form air-out path, and wind path is in charge ofThe other end connects with corresponding compression reservoir 11. Wind regime is in charge of to 11 compressions by wind path house steward, 11 wind pathsReservoir 11 air feeds, control the thrust of each compression reservoir 11. On wind path house steward, be serially connected with for regulating blastWind regime distributing valve 14, controlled wind path house steward's blast by wind regime distributing valve 14, and then unifiedly control each compression reservoir11 thrust, the maximum pressure that compresses reservoir 11 is 6Kgf/cm2, the maximum output pressure of single cylinder body is 50Kgf, and respectively compress the compression of reservoir 11 and release movement is controlled by reservoir control valve 13 is unified, can protect like thisThe thrust equilibrium of card side wall 2 each points and synchronously consistent.
Wind path house steward's terminal part and each wind path are in charge of the inside that is all arranged on crossbeam 5, wind regime distributing valve 14 Hes13 of reservoir control valves are arranged on column 6, handled easily personnel operation.
Wind path is in charge of and is can be common plastic tube or sebific duct, and wind path to divide length of tube to have reserved, can meet compression reservoirThe needs that 11 positions regulate arbitrarily. The wind path that increase and decrease is connected with air outlet is simultaneously in charge of, and can regulate and compress reservoir 11And the quantity of reservoir pressure head 12, when required compression reservoir 11 and reservoir pressure head 12 quantity exceed the upper air-out of wind path house stewardMouthful quantity time, can increase wind path house steward's quantity.
Describe welding procedure below in detail as follows:
1, control lifting reservoir 18 and move upward, crossbeam 5 is risen, reserve enough height, side wall 2 is putPut on jig 3.
2, after side wall 2 is in place, to control lifting reservoir 18 and move downward, crossbeam 5 is dropped to can pressThe position of the design of tight side wall 2, inserts locating detent 10 in the pin-and-hole of bearing 19, and the height of crossbeam 5 is solidFixed.
3, promote column 6 and move along track base 7, and then adjust the position of hold down gag 4, make in hold down gag 4Crossbeam 5 be positioned at the top of a certain solder joint that transversely needs spot welding of side wall 2. Again according to side wall 2 herein transverselySkeleton structure, regulate the position of each compression reservoir 11, and the reservoir 11 that is fixed and clamped.
4, regulate wind regime distributing valve 14, control the force value that compresses reservoir 11 and reservoir pressure head 12, make it meet workSkill requirement. Control air cylinder control valve 13 simultaneously, starts and compresses reservoir 11 compression actions, makes reservoir pressure head 12 downwardStretch out and compress side wall 2.
5, the spot-wedling electrode on the welding machine of start-up point, carries out spot welding to all solder joints within the scope of reservoir pressure head 12 compressions.
Due to the compression of 11 reservoir pressure heads 12, make side wall 2 transversely realize entirety pressure to skeleton and wallboard at thisTightly, the outer surface that makes skeleton and wallboard in the time of welding and jig 3 closely connected, and rely on thrust by side wall 2 wallsThe wave transformation of plate is eliminated, and completes in this state spot welding, and spot welding rear wall plate and skeleton form entirety, and self is firmDegree strengthens, and discharges after thrust, and it is smooth that outer surface still can keep, and improves flatness.
6, control air cylinder control valve 13, discharges compression reservoir 11 and discharges, and reservoir pressure head 12 upwards lifts, Jin ErsongDrive hold down gag 4.
7, repeat above-mentioned 3 to 6 step, hold down gag 4 is adjusted to the position that next place needs spot welding, compressSide wall 2, implements spot welding, until all solder joint has welded.
8, the locating detent 10 at crossbeam 5 two ends is extracted, started lifting reservoir 18 and move upward, drive crossbeam 5Upwards lift, the side wall 2 after welding is shifted out, then crossbeam 5 is set back.
Whole welding process finishes.
As mentioned above, given scheme content, can derive similar technical scheme by reference to the accompanying drawings. In every case beDo not depart from the content of technical solution of the present invention, any letter of above embodiment being done according to technical spirit of the present inventionSingle amendment, equivalent variations and modification, all still belong in the scope of technical solution of the present invention.

Claims (8)

1. a stainless steel car body side wall single-side spot welding hold down gag, comprises that two are divided into jig both sidesColumn, be across the crossbeam that described jig top connects two described columns, on described crossbeam, be provided with manyIndividual for compressing the compressing member of described side wall, it is characterized in that: the both sides of described jig are respectively equipped with track base,On described track base, linear guides is installed, described column lower end inner side is sliding near the built-in guide rail in described jig placePiece, described guide rail slide block is embedded in described linear guides, moves along described linear guides; On described column, arrangeHave two bearings, described bearing is relatively set with pin-and-hole, in described pin-and-hole, inserts locating detent, described locating detentBe positioned at the top of described beam-end.
2. stainless steel car body side wall single-side spot welding hold down gag as claimed in claim 1, is characterized in that: instituteState column inside and be provided with lifting reservoir, the two ends of described crossbeam are fixedly connected with described lifting reservoir.
3. stainless steel car body side wall single-side spot welding hold down gag as claimed in claim 1 or 2, is characterized in that:Described compressing member is by compressing reservoir and reservoir pressure head forms, and described compression reservoir is connected with wind regime by pipeline, in instituteState in pipeline and be serially connected with wind regime distributing valve, described compression reservoir is slidably connected with described crossbeam, arbitrarily regulates and compressesThe position of point, the action of described compression reservoir is by the control of reservoir control valve, described wind regime distributing valve and reservoir control valveBe arranged on described column.
4. stainless steel car body side wall single-side spot welding hold down gag as claimed in claim 3, is characterized in that: instituteState pipeline and comprise that wind path house steward and many wind paths are in charge of, described wind path house steward is provided with multiple air outlets, described wind pathBe in charge of one end and described air outlet is fixedly connected to form air-out path, the other end is connected with described compression reservoir, described inWind regime distributing valve is serially connected on described wind path house steward.
5. stainless steel car body side wall single-side spot welding hold down gag as claimed in claim 3, is characterized in that: instituteStating crossbeam is hollow structure, and described pipeline and described compression reservoir are arranged in described crossbeam, at the end of described crossbeamPortion is provided with elongated open slot, and described reservoir pressure head stretches out from the open slot of described crossbeam bottom.
6. stainless steel car body side wall single-side spot welding hold down gag as claimed in claim 3, is characterized in that: instituteStating crossbeam is made up of stainless steel tube.
7. a mash welder, comprises welding machine portal frame, for placing jig and the spot-wedling electrode of side wall to be welded,It is characterized in that: on described jig, be provided with the hold down gag as described in claim 1 to 6 any one.
8. a welding procedure, is characterized in that, comprises the steps:
Side wall to be welded is placed on the jig of mash welder;
After side wall is in place, controls crossbeam and drop to the position that can compress side wall, locating detent is inserted into and is propped upIn the pin-and-hole of seat, horizontal depth of beam is fixed;
Utilize hold down gag that a certain side wall bond pad locations that transversely needs spot welding is carried out to entirety compression, make side wall boneFrame and wallboard outer surface and described jig are closely connected;
The solder joint being compressed by hold down gag is carried out to spot weld operation;
Unclamp hold down gag, hold down gag is adjusted to the position that next place needs spot welding, compress side wall, implement pointWeldering.
CN201210272039.XA 2012-08-01 2012-08-01 Stainless steel curb wall is hold down gag, mash welder and welding procedure for indirect welding Active CN103567617B (en)

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Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104959745A (en) * 2015-08-05 2015-10-07 贵州汇通申发钢结构有限公司 Gantry type welding device used for welding boxcar side wall
CN105382393A (en) * 2015-12-08 2016-03-09 天津七所高科技有限公司 Single-face double-point welding process for automobile
CN110369847A (en) * 2019-08-21 2019-10-25 中车四方车辆有限公司 A kind of single-side resistance spot welding welding tooling and welding method for rail vehicle

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US5020714A (en) * 1989-04-12 1991-06-04 The Boeing Company Method and press apparatus for manufacturing
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CN202317535U (en) * 2011-11-18 2012-07-11 株洲联诚集团有限责任公司 Electric locomotive roof assembly welding fixture
CN102554437A (en) * 2012-01-31 2012-07-11 福州星云自动化技术有限公司 Gantry-type automatic spot welding system for battery pack
CN202804471U (en) * 2012-08-01 2013-03-20 南车青岛四方机车车辆股份有限公司 Spot welder and compressing device for welding lateral wall units of the stainless steel

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5020714A (en) * 1989-04-12 1991-06-04 The Boeing Company Method and press apparatus for manufacturing
US5409158A (en) * 1993-07-08 1995-04-25 Progressive Tool & Industries Company Automobile framing system
CN201283483Y (en) * 2008-10-30 2009-08-05 青特集团有限公司 Movable type gantry hydraulic hold-down mechanism
CN201579554U (en) * 2009-12-02 2010-09-15 齐齐哈尔轨道交通装备有限责任公司 Gantry pressing machine
CN202317535U (en) * 2011-11-18 2012-07-11 株洲联诚集团有限责任公司 Electric locomotive roof assembly welding fixture
CN102554437A (en) * 2012-01-31 2012-07-11 福州星云自动化技术有限公司 Gantry-type automatic spot welding system for battery pack
CN202804471U (en) * 2012-08-01 2013-03-20 南车青岛四方机车车辆股份有限公司 Spot welder and compressing device for welding lateral wall units of the stainless steel

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Address after: Chengyang District of Shandong city of Qingdao province Jinhong road 266111 No. 88

Patentee after: CRRC QINGDAO SIFANG CO., LTD.

Address before: Jihongtan town Chengyang District Shandong city Qingdao province Jinhong road 266111 No. 88

Patentee before: CSR Qingdao Sifang Locomotive and Rolling Stock Co., Ltd.

C56 Change in the name or address of the patentee