CN211248768U - Auxiliary welding tool for underframe frame - Google Patents
Auxiliary welding tool for underframe frame Download PDFInfo
- Publication number
- CN211248768U CN211248768U CN201921323987.5U CN201921323987U CN211248768U CN 211248768 U CN211248768 U CN 211248768U CN 201921323987 U CN201921323987 U CN 201921323987U CN 211248768 U CN211248768 U CN 211248768U
- Authority
- CN
- China
- Prior art keywords
- welding
- chassis
- positioning
- tool
- transverse
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
Chassis frame welding auxiliary fixtures, put forward integral type chassis frame assembly welding frock and welding method to compatible chassis is anti-position and is just positioned assembly welding technology, to the assembly welding and adjusts the process and formulate the optimization method, thereby solve chassis frame effectively and be difficult to assemble and adjust, satisfy welding technology standard requirement, guarantee welding quality, improvement production efficiency in butt weld clearance. The auxiliary welding tool for the underframe frame comprises a group of tool longitudinal beams which are arranged left and right and are arranged along the left and right side beam directions, a plurality of tool supporting beams are fixedly connected onto the tool longitudinal beams, and underframe reversed tool cross beams are fixedly connected between the left and right symmetrical tool supporting beams; the combined linkage hydraulic oil cylinder is connected with the chassis righting tool cross beam in a vertical driving mode at the transverse side part of each chassis righting tool cross beam; and two side ends of each chassis reverse tooling cross beam are respectively provided with a positioning side edge beam positioning device and an adjusting side edge beam positioning device.
Description
Technical Field
The application provides a welding auxiliary fixtures that is used for chassis boundary beam and friction welding floor to rail vehicle's chassis frame subassembly welding, belongs to machine-building and welding field.
Background
With the rapid development of rail vehicle industrialization, the requirements for frame assembly welding precision in the field of vehicle body manufacturing are higher and higher.
The aluminum alloy underframe is used as a main bearing part of a car body, the size of the aluminum alloy underframe directly influences matching assembly within tolerance ranges of side walls, a car roof and end walls, the assembly welding of the underframe frame is used as a front process of the underframe, and the post-welding size of the aluminum alloy underframe directly influences positioning assembly welding of parts in a rear process and cross inspection of the underframe assembly, so that higher requirements are provided for the assembly welding tool and the assembly welding process method of the underframe frame.
The underframe frame of the existing aluminum alloy car body is usually formed by welding edge beams and a plurality of cross beams in a splicing way, after the size is qualified, the floor is paved, and although the assembling process is complex, a single section bar is small in size and easy to assemble, adjust and control. A certain A type aluminum alloy city rail train adopts novel design theory, becomes chassis frame construction by the friction weld floor assembly welding after boundary beam and the machining, and the friction weld floor that polylith floor section bar splice welding formed, the quality is big, bulky, warp little, the size stability is its key feature, though chassis frame composition structural design simplifies, but has nevertheless provided higher requirement to chassis frame assembly welding process and postweld size. On one hand, if the design of the assembly welding tool or the assembly steps are unreasonable, the assembly difficulty of the chassis frame is increased, and the quality of a welding seam is seriously influenced; on the other hand, if the size of the chassis frame is out of tolerance, the assembly of the parts of the post process can be influenced, products are scrapped when the assembly is serious, the adjustment workload and the adjustment and correction difficulty are increased, and the production efficiency is reduced.
In view of this, the present application is specifically made.
SUMMERY OF THE UTILITY MODEL
Chassis frame welding auxiliary fixtures, lie in solving the problem that above-mentioned prior art exists and propose integral type chassis frame assembly welding frock and welding method to compatible chassis is reversed and is just positioned the assembly welding technology, formulate optimization method to assembly welding and adjustment process, thereby solve chassis frame effectively and be difficult to equipment and adjustment, satisfy the requirement of welding technology standard to the welding seam clearance, guarantee welding quality, improve production efficiency.
For realizing above-mentioned design purpose, chassis frame welding auxiliary fixtures mainly including:
a group of left and right tool longitudinal beams which are arranged along the left and right side beam directions are arranged in an auxiliary mode, a plurality of tool supporting beams are fixedly connected onto the tool longitudinal beams, and a bottom frame reverse tool cross beam is fixedly connected between the left and right symmetrical tool supporting beams;
the transverse side part of each chassis reverse tooling crossbeam is connected with the chassis normal tooling crossbeam in a vertical driving manner by a combined linkage hydraulic oil cylinder;
two side ends of each chassis inverted tooling beam are respectively provided with a positioning side edge beam positioning device and an adjusting side edge beam positioning device; the positioning side edge beam positioning device and the adjusting side edge beam positioning device respectively comprise a vertical pressing device and a transverse tensioning device; the positioning device for adjusting the side beams also comprises a propelling device.
The further refinement and improvement scheme is that the vertical pressing device preferably adopts a caliper structure, and comprises a fixed support for supporting a rotary pressing arm, a first positioning stop block for limiting a transverse device of the rotary pressing arm is arranged on the fixed support, and a pressing handle is arranged at the vertical end of the rotary pressing arm.
The transverse tensioning device is preferably of a caliper structure and comprises a mounting seat for supporting the rotary tensioning arm, a first positioning stop block for limiting the transverse device of the rotary tensioning arm is arranged on the mounting seat, and a tensioning handle is arranged at the transverse end of the rotary tensioning arm.
The pushing device comprises a sliding track for slidably connecting the transverse tensioning device, a rotating bolt for driving and connecting the transverse tensioning device, and a second positioning stop block.
And transverse jacks are symmetrically arranged along the adjusting ends of the plurality of chassis reverse tooling beams.
And the at least one group of tool longitudinal beams are provided with a chassis transverse center positioning device which comprises a pointer sliding rail arranged at the top end of the positioning support, and a center positioning pointer is connected to the pointer sliding rail in a sliding manner.
In summary, the auxiliary tool for welding the underframe frame and the method thereof have the following advantages:
1. the integrated tool is compatible with the functions of reverse position assembly welding and normal position assembly welding of the underframe, the requirement on the tool field is reduced, the tool cost is saved, the conversion of the forward and reverse position tools can be realized only by linkage of the hydraulic oil cylinder, the operation is simple and convenient, the practicability is high, and the production efficiency is obviously improved;
2. by the technical specifications of the assembly operation steps, the operation process of the positioning device and the spot-welding sequence, the problems of difficult assembly and difficult adjustment of the chassis frame are effectively solved, the working efficiency is obviously improved, the working strength is reduced, the problem of uneven welding seam gap is thoroughly solved, and the requirements of welding seam quality and product size are ensured;
3. the expected effect is achieved by optimizing the process for controlling the important dimension in the repair process, namely, the tolerance in the width direction of the chassis frame is fully optimized, the welding quality is obviously improved, the chassis edge beam is prevented from inclining in a parallel four-edge mode, and the smooth proceeding of the subsequent process is ensured;
drawings
FIG. 1 is a schematic view of the construction of a chassis frame;
FIG. 2 is an enlarged view of portion A of FIG. 1;
FIG. 3 is a schematic view of a welding assistance tool;
FIG. 4 is an enlarged schematic view of section B of FIG. 3;
FIG. 5 is a schematic view of the friction welded floor and locating side rail assembly;
FIG. 6 is an enlarged schematic view of section C of FIG. 5;
FIG. 7 is an enlarged schematic view of section D of FIG. 5;
FIG. 8 is a transverse view of the undercarriage frame after being assembled and positioned using the welding assistance tool;
FIG. 9 is a schematic view of a group welding process flow;
FIG. 10 is a schematic illustration of controlled dimensional adjustments after welding;
FIG. 11 is an enlarged view of section E of FIG. 10;
as shown in fig. 1 to 11, an adjusting side beam positioning device 1, an underframe inverted tooling cross beam 2, an underframe upright tooling cross beam 3, a combined linkage hydraulic oil cylinder 4, a tooling support beam 5, a tooling longitudinal beam 6, a jack 7, a rotary pressing arm 8, a first positioning stop block 9, a fixed support 10, a pressing handle 11, a rotary tensioning arm 12, a tensioning handle 13, a mounting seat 14, a sliding rail 15, a second positioning stop block 16, a rotary bolt 17, a positioning support 18, a center positioning pointer 19, a pointer sliding rail 20, a vertical pressing device 100, a transverse tensioning device 200, a propelling device 300, a positioning side beam positioning device 400, an underframe transverse center positioning device 500, a positioning side beam 600, a friction welding floor 700 and an adjusting side beam 800.
Detailed Description
Example 1 the present invention will be described in further detail below with reference to the accompanying drawings.
As shown in fig. 1 and 2, an aluminum alloy underframe frame assembly applied to a railway vehicle is formed by assembling and welding a positioning side beam 600, an adjusting side beam 800 and a friction welding floor 700, and the welding joint is in the form of a plug-in 4V butt welding seam.
As shown in fig. 3 to 8, the auxiliary welding tool for the chassis frame includes:
a group of left and right tool longitudinal beams 6 which are arranged along the left and right side beam directions;
a left group of tool supporting beams 5, a right group of tool supporting beams 5 and a plurality of tool supporting beams are fixedly connected to the tool longitudinal beams 6;
a chassis reversed tooling crossbeam 2 is fixedly connected between each pair of tooling support beams 5 which are arranged symmetrically left and right;
a combined linkage hydraulic oil cylinder 4 is vertically driven and connected with an underframe righting tool crossbeam 3 at the transverse side part of each underframe righting tool crossbeam 2;
two side ends of each chassis inverted tooling beam 2 are respectively provided with a positioning side edge beam positioning device 400 and an adjusting side edge beam positioning device 1; the positioning side edge beam positioning device 400 and the adjusting side edge beam positioning device 1 both comprise a vertical pressing device 100 and a transverse tensioning device 200; the positioning device 1 for adjusting the side sill further comprises a propelling device 300.
The vertical pressing device 100 is preferably of a caliper structure and comprises a fixed support 10 for supporting the rotary pressing arm 8, a first positioning stop block 9 for limiting the transverse device of the rotary pressing arm 8 is arranged on the fixed support 10, and a pressing handle 11 is arranged at the vertical end of the rotary pressing arm 8.
Similarly, the transverse tensioning device 200 is preferably a caliper structure, which includes a mounting seat 14 for supporting the rotary tensioning arm 12, a first positioning stop 9 for limiting the transverse device of the rotary tensioning arm 12 is arranged on the mounting seat 14, and a tensioning handle 13 is arranged at the transverse end of the rotary tensioning arm 12.
The pushing device 300 includes a sliding rail 15 for slidably connecting the lateral tightening device 200, a rotation bolt 17 for driving and connecting the lateral tightening device 200, and a second positioning stopper 16.
3 transversely-propelled jacks 7 are arranged at the longitudinal two ends and the center of the underframe frame along the adjusting end of the underframe reverse tooling crossbeam 2 so as to synchronously propel the whole underframe frame to assist in implementing reverse butt welding and meet the gap requirement of a welding seam.
Corresponding to the center positioning holes of the positioning side edge beam 600 and/or the adjusting side edge beam 800, at least one group of tool longitudinal beams 6 is provided with an underframe transverse center positioning device 500 which comprises a pointer sliding rail 20 arranged at the top end of the positioning bracket 18, and a center positioning pointer 19 is connected on the pointer sliding rail 20 in a sliding manner. The chassis transverse center positioning device 500 is used as a longitudinal positioning reference of the chassis frame, and only the positioning side edge beam 600 and/or the center positioning hole of the adjusting side edge beam 800 are required to be ensured to be flush with the positioning side edge beam during assembly, so that the workload of chassis frame assembly measurement and adjustment positioning is effectively reduced, and the production efficiency is remarkably improved.
As shown in fig. 8 to 11, based on the above-mentioned auxiliary welding tool for the chassis frame, the assembly welding method described in the present application optimizes the assembly process and the post-welding repair process of the chassis frame in the process flow and performs the process specification in the following processes.
The method comprises the following implementation steps:
(1) positioning, assembling, adjusting and positioning the boundary beams on the two sides and the friction welding floor;
(2) positioning spot welding and section welding of the edge beams on the two sides and the friction welding floor;
(3) positive and negative tooling conversion and positive welding of the chassis frame;
(4) and adjusting and repairing and controlling the size of the underframe frame.
Specifically, before the step (1), after the side edge beams 600, the friction welding floor 700 and the adjusting side edge beams 800 are positioned and fed, whether central position holes of the side edge beams and the central position holes of the floor are correct or not is confirmed, and cleaning and polishing are performed before welding to remove oil stains, oxidation films and the like;
in the step (1), the side edge beam 600 and the friction welding floor 700 are hoisted and positioned; the following placement requirements are: the center positioning hole of the positioning side edge beam 600 is flush with the center positioning pointer 19 of the chassis transverse center positioning device 500, and the distance between the placed friction welding floor 700 and the positioning side edge beam 600 is preferably that the hanging strip can be drawn out;
lifting the positioning side edge beam 600 to the auxiliary welding tool, in order to ensure that the friction welding floor 700 and the positioning side edge beam 600 can be smoothly lapped and inserted, uniformly arranging 5 tensioning points at the end part and the center of the positioning side edge beam 600, and performing pre-transverse tensioning positioning on the 5 tensioning points of the positioning side edge beam 600 through the rotary tensioning arm 12 of the positioning side edge beam positioning device 400;
in the process of reverse assembly of the underframe frame, a plurality of transverse jacks 7 are used for synchronously pushing the underframe reverse tooling beam 2 from the adjusting end to the positioning end so as to assist in reverse butt welding; namely, 3 jacks 7 are operated simultaneously to slowly push the friction welding floor 700 to be in lap joint with the welding seam base plate of the positioning side edge beam 600 by 2-3 mm, and the friction welding floor 700 is stopped to be pushed and lap joint confirmation is carried out; continuously and simultaneously operating the 3 jacks 7, and slowly pushing the friction welding floor 700 for the second time until the gap between the welding seams meets the requirement of welding process specifications; at this time, firstly, tensioning all tensioning points by the rotating tensioning arm 12 of the positioning side edge beam positioning device 400, then vertically compressing the positioning side edge beam 600 by the rotating compressing arm 8, and finally performing spot welding and fixing on the underframe normal position welding line in the area of the positioning side edge beam 600;
lifting and adjusting the side beam 800 to the auxiliary welding tool, ensuring that the central position hole of the side beam 800 is aligned with the central positioning pointer 19, and pushing and adjusting the side beam 800 to the set width size of the underframe through the rotating bolt 17 of the pushing device 300; then, the transverse tensioning device 200 is used for tensioning and fixing the adjusting side edge beam 800; finally, the vertical pressing device 100 is used for pressing and adjusting the side edge beam 800;
in the step (1), measuring the pre-set width size and the diagonal difference of the underframe frame;
in the step (2), after the assembly size of the underframe frame is qualified, spot welding of the 4V welding line of the underframe frame needs to be performed under the combined action of the rotary tensioning arm 12 and the rotary pressing arm 8. Firstly, spot welding the normal weld joint of the underframe, and then spot welding the reversed weld joint of the underframe; the spot welding position is parallel and level with the chassis inverted tool cross beam 2 of the chassis frame welding auxiliary tool;
after the tack welding is finished, the 4V welding seam of the underframe frame still needs to be subjected to tack welding under the combined action of the rotary tensioning arm 12 and the rotary pressing arm 8. Firstly, welding the reversed welding seam section of the underframe, and then welding the normal welding seam section of the underframe; the sequence of spot welding is from the middle to the two ends, and 2 persons can simultaneously position and spot weld;
the welding position of the chassis inversion section is parallel and level to the chassis inversion tool beam 2; the right-position section welding positions of the underframe are leveled by 1 underframe reversed tooling crossbeam 2 at intervals to perform section welding; the sequence of the segment welding is as follows: and (3) positioning and welding the sections from the middle to the two ends by 2 persons, wherein the length of the section welding is 80-100 mm.
In the step (2), the welding process sequence is normal spot welding, reverse section welding and normal section welding; the welding direction is from the middle to both ends, and the positioning section welding is carried out by a plurality of people at the same time.
After the positioning section welding is finished, all the rotary pressing arms 8 and the rotary tensioning arms 12 need to be loosened, and the inverted IGM automatic welding of the underframe is finished; the IGM automatic welding direction is from one side end of the underframe frame to the other side end;
and (3) adjusting the vertical height of the chassis righting tooling cross beam 3 through the combined linkage hydraulic oil cylinder 4, and placing the righting side of the chassis frame on the chassis righting tooling cross beam 3.
Namely, the lifting underframe frame rises vertically, the underframe reversed assembly welding tool is converted into a normal assembly welding tool through the combined linkage hydraulic oil cylinder 4, the underframe frame is turned over and falls onto the underframe normal assembly welding tool, all the rotary pressing arms 8 are pressed against the positioning side edge beam 600 and the adjusting side edge beam 800, and the underframe normal IGM automatic welding is completed; IGM automatic welding direction: from one side end of the chassis frame to the other side end;
as shown in fig. 10 and 11, in the step (4), the underframe frame is lifted to the repair station;
and carrying out process specification on important control sizes from the key working procedures to the adjusting and repairing process.
For example, before adjustment and repair, the width of the right position of the underframe frame, the width of the outer lower ends of the two side beams (the underframe is in the inverted position), the diagonal difference, the floor flatness and the straightness of the side beams are measured and marked;
and controlling the important control dimension of the underframe frame through adjustment and repair. The specific requirements include: the perpendicularity of the outer sides of the two side beams relative to the floor plane of the chassis in the normal position is less than or equal to 1 mm; the floor flatness of the two side beams in the positive position relative to the underframe is less than or equal to 1mm, and the two side beams are prohibited from downwarping; the tolerance of the width L2 (undercarriage inverted) of the outer lower ends of the side members is (0, +2) compared with the width L1 of the undercarriage frame in the normal position;
after the adjustment and the repair are finished, carrying out self-checking and confirmation on the important control size, and turning to the next procedure after the size is qualified;
as described above, similar technical solutions can be derived from the solutions given in the figures and the embodiments. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical substance of the present invention are still within the scope of the technical solution of the present invention.
Claims (6)
1. The utility model provides an underframe frame welding auxiliary fixtures which characterized in that: a group of left and right tool longitudinal beams (6) which are arranged along the left and right side beam directions, a plurality of tool supporting beams (5) are fixedly connected on the tool longitudinal beams (6), a chassis reversed tool cross beam (2) is fixedly connected between the left and right symmetrical tool supporting beams (5),
a combined linkage hydraulic oil cylinder (4) is connected with the chassis righting tooling crossbeam (3) in a driving way along the vertical direction at the transverse side part of each chassis righting tooling crossbeam (2);
two side ends of each chassis inverted tooling beam (2) are respectively provided with a positioning side edge beam positioning device (400) and an adjusting side edge beam positioning device (1); the positioning device (400) for the side edge beam and the positioning device (1) for the side edge beam are adjusted, and each positioning device comprises a vertical pressing device (100) and a transverse tensioning device (200); the side beam adjusting positioning device (1) further comprises a propelling device (300).
2. The chassis frame welding auxiliary tool according to claim 1, characterized in that: the vertical pressing device (100) is of an optimal caliper structure and comprises a fixed support (10) used for supporting a rotary pressing arm (8), a first positioning stop block (9) used for limiting a transverse device of the rotary pressing arm (8) is arranged on the fixed support (10), and a pressing handle (11) is arranged at the vertical end of the rotary pressing arm (8).
3. The chassis frame welding auxiliary tool according to claim 1, characterized in that: the transverse tensioning device (200) is preferably of a caliper structure and comprises a mounting seat (14) used for supporting the rotary tensioning arm (12), a first positioning stop block (9) used for limiting the transverse device of the rotary tensioning arm (12) is arranged on the mounting seat (14), and a tensioning handle (13) is arranged at the transverse end of the rotary tensioning arm (12).
4. The chassis frame welding auxiliary tool according to claim 1 or 3, characterized in that: the pushing device (300) comprises a sliding track (15) for slidably connecting the transverse tensioning device (200), a rotating bolt (17) for driving and connecting the transverse tensioning device (200), and a second positioning stop block (16).
5. The chassis frame welding auxiliary tool according to claim 1, characterized in that: and transverse jacks (7) are symmetrically arranged along the adjusting ends of the plurality of chassis inverted tool cross beams (2).
6. The chassis frame welding auxiliary tool according to claim 1, characterized in that: and at least one group of tool longitudinal beams (6) is provided with an underframe transverse center positioning device (500) which comprises a pointer sliding rail (20) arranged at the top end of the positioning bracket (18), and a center positioning pointer (19) is connected on the pointer sliding rail (20) in a sliding way.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921323987.5U CN211248768U (en) | 2019-08-15 | 2019-08-15 | Auxiliary welding tool for underframe frame |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921323987.5U CN211248768U (en) | 2019-08-15 | 2019-08-15 | Auxiliary welding tool for underframe frame |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211248768U true CN211248768U (en) | 2020-08-14 |
Family
ID=71964209
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921323987.5U Active CN211248768U (en) | 2019-08-15 | 2019-08-15 | Auxiliary welding tool for underframe frame |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211248768U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110480153A (en) * | 2019-08-15 | 2019-11-22 | 青岛四方庞巴迪铁路运输设备有限公司 | Undercarriage frame welds auxiliary mould and its method |
| CN115488555A (en) * | 2022-10-14 | 2022-12-20 | 安徽江淮专用汽车有限公司 | Be used for compression car weld gap adjustment instrument |
-
2019
- 2019-08-15 CN CN201921323987.5U patent/CN211248768U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110480153A (en) * | 2019-08-15 | 2019-11-22 | 青岛四方庞巴迪铁路运输设备有限公司 | Undercarriage frame welds auxiliary mould and its method |
| CN115488555A (en) * | 2022-10-14 | 2022-12-20 | 安徽江淮专用汽车有限公司 | Be used for compression car weld gap adjustment instrument |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110480153A (en) | Undercarriage frame welds auxiliary mould and its method | |
| CN211248768U (en) | Auxiliary welding tool for underframe frame | |
| CN202804532U (en) | Side dumper auxiliary frame assembly and welding tool | |
| CN206305681U (en) | Low-floor tramcar drivers' cab underframe group mounted welder | |
| CN112605548B (en) | Assembly welding method for box-type center sill of railway wagon | |
| CN106607638A (en) | A railway vehicle chassis floor welding process | |
| CN213438026U (en) | Auxiliary positioning tool for positive and negative position assembly welding of car roof | |
| CN216508351U (en) | Modular subway underframe | |
| CN111889908A (en) | Processing, assembling and welding method for boundary beam assembly | |
| CN205414817U (en) | A upset platform machine for welding channel -section steel gusset | |
| CN207289298U (en) | The transverse beam assembly welding tooling of low-floor tramcar drivers' cab chassis | |
| CN116197590A (en) | Frame concatenation frock that clamping stability is high | |
| CN110860770B (en) | Vehicle body underframe assembly and welding process thereof | |
| CN210359900U (en) | Rail vehicle chassis pre-assembling tool | |
| CN112091517A (en) | Auxiliary positioning tool and method for positive and negative position assembly welding of car roof | |
| CN109332978B (en) | Bridge crane end beam positioning method | |
| CN209936190U (en) | Bucket mechanism tailor-welding tool turns over | |
| CN114289919A (en) | Welding process for traction, bolster and buffering of lightweight aluminum alloy vehicle body | |
| CN109396824B (en) | Assembling table for front frame of special vehicle | |
| CN112975236B (en) | Assembly welding positioning method for open type underframe frame | |
| CN114310014B (en) | Assembling and welding process method for bogie frame of straddle type monorail vehicle | |
| CN216326128U (en) | Production equipment for underframe assembly of rubber-tyred vehicle | |
| CN221110515U (en) | Assembly welding tool for side beams of monorail car | |
| CN215616052U (en) | Electric locomotive framework assembly wing plate tension and compression tool | |
| CN218533387U (en) | Modular bogie crossbeam manipulator welding auxiliary device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: No.86, Jinhong East Road, Chengyang District, Qingdao City, Shandong Province Patentee after: Qingdao Sifang Alstom railway transportation equipment Co.,Ltd. Address before: No.86, Jinhong East Road, Chengyang District, Qingdao City, Shandong Province 266111 Patentee before: BOMBARDIER SIFANG (QINGDAO) TRANSPORTATION Ltd. |
|
| CP03 | Change of name, title or address |