CN114985869A - Railway wagon center plate seat and automatic welding method thereof - Google Patents
Railway wagon center plate seat and automatic welding method thereof Download PDFInfo
- Publication number
- CN114985869A CN114985869A CN202110232013.1A CN202110232013A CN114985869A CN 114985869 A CN114985869 A CN 114985869A CN 202110232013 A CN202110232013 A CN 202110232013A CN 114985869 A CN114985869 A CN 114985869A
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- welding
- plate
- connecting plate
- partition
- reinforcing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/02—Seam welding; Backing means; Inserts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/12—Automatic feeding or moving of electrodes or work for spot or seam welding or cutting
- B23K9/127—Means for tracking lines during arc welding or cutting
- B23K9/1272—Geometry oriented, e.g. beam optical trading
- B23K9/1274—Using non-contact, optical means, e.g. laser means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/32—Accessories
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61F—RAIL VEHICLE SUSPENSIONS, e.g. UNDERFRAMES, BOGIES OR ARRANGEMENTS OF WHEEL AXLES; RAIL VEHICLES FOR USE ON TRACKS OF DIFFERENT WIDTH; PREVENTING DERAILING OF RAIL VEHICLES; WHEEL GUARDS, OBSTRUCTION REMOVERS OR THE LIKE FOR RAIL VEHICLES
- B61F1/00—Underframes
- B61F1/08—Details
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T30/00—Transportation of goods or passengers via railways, e.g. energy recovery or reducing air resistance
Abstract
The invention provides a railway wagon center seat and an automatic welding method thereof. The laser locating method is characterized in that laser locating is firstly carried out when the mandrel base is welded, and then the laser locating method is automatically completed by a welding robot. The time of a single-piece mandrel seat workpiece welded by the method is about 15 minutes, the efficiency is improved by 1 time compared with manual welding, the working condition is improved, an operator is far away from welding arc light, smoke, splash, high temperature and the like, and the working safety is guaranteed.
Description
Technical Field
The invention relates to the field of automatic welding, in particular to a railway wagon center plate seat and an automatic welding method thereof.
Background
In the prior art, the production mode of the railway wagon is changed in a positive intelligent mode, on one hand, welding stress deformation of a center plate seat can be caused due to welding stress on a welding process of a sleeper beam steel structure group and improper processing of process links in the traditional welding process of the center plate seat of a railway wagon body steel structure sleeper beam, the installation flatness is not enough, and the problems of rivet breakage and center plate cracking are caused due to load and running impact in the application process after the center plate is riveted and installed; on the other hand, the automation degree is low, the production efficiency is low, the required labor cost is high, and the development of enterprises is seriously tired. Therefore, there is a need for an automated mandrel holder welding method with high automation, high efficiency and excellent quality of the obtained products.
Disclosure of Invention
The invention provides a railway wagon center seat and an automatic welding method thereof, and aims to improve the welding efficiency and quality of the center seat.
In order to achieve the aim, the invention provides a railway wagon center plate seat which comprises a first connecting plate, a second connecting plate, a first partition plate, a second partition plate, a first reinforcing plate and a second reinforcing plate; first stiffening plate and the vertical locating of second stiffening plate work piece both sides, pass through between first stiffening plate and the second stiffening plate first connecting plate and second connecting plate are connected, first connecting plate and second connecting plate are located first stiffening plate and second stiffening plate bottom and parallel arrangement, first baffle and second baffle connect perpendicularly respectively in on first connecting plate and the second connecting plate, first baffle and second baffle both ends with first stiffening plate and second stiffening plate are connected.
Further, in the first step, the thicknesses of the first reinforcing plate and the second reinforcing plate are 10mm, the thicknesses of the first connecting plate and the second connecting plate are 14mm, and the thicknesses of the first partition plate and the second partition plate are 14 mm.
The invention also provides an automatic welding method of the railway wagon center plate seat, which comprises the following steps:
step one, preparing a mandrel seat workpiece, wherein the workpiece comprises;
secondly, searching positions by adopting a point laser system, and searching positions on the second partition plate, the first connecting plate and the second connecting plate in sequence;
step three, welding the workpiece, wherein the welding sequence is as follows: the joint of the first reinforcing plate and the first connecting plate and the second connecting plate, the joint of the second reinforcing plate and the first connecting plate and the second connecting plate, the joint of the first connecting plate and the second connecting plate and the first clapboard and the second clapboard, the positioner turn 90 degrees clockwise, the joint of the first reinforcing plate and the first clapboard and the second clapboard, the positioner turn 180 degrees anticlockwise, the joint of the second reinforcing plate and the first clapboard and the second clapboard, and the positioner turn 90 degrees clockwise;
and step four, completing welding and cleaning splashing.
Furthermore, in the second step, the position searching mode of the second partition board is to perform four sets of 1D position searching vertically on the surface of the second partition board opposite to the first partition board; the position searching mode of the first partition plate is that four groups of 1D position searching are vertically carried out on one surface of the first partition plate, which is back to the second partition plate; the position searching mode of the first connecting plate and the second connecting plate is that a group of 1D position searching is respectively and vertically carried out on the upper surfaces of the first connecting plate and the second connecting plate.
Furthermore, in the third step, the joint of the first reinforcing plate and the first connecting plate and the second connecting plate is subjected to single-side welding from the inside of the workpiece, and the welding line direction is from two sides of the first connecting plate to the first partition plate and from two sides of the second connecting plate to the second partition plate; the welding angle of the welding is 6mm, the welding current is 260A, the welding voltage is 28-30V, the welding speed is 500mm/min, the swing frequency is 2.9HZ, the amplitude is 1.3mm, the swing dwell time is 0.1s, the arc closing current is 180A, and the gas flow is 19-25L/min.
Furthermore, in the third step, the joint of the second reinforcing plate and the first connecting plate and the second connecting plate is subjected to single-side welding from the inside of the workpiece, and the welding line direction is from two sides of the first connecting plate to the first partition plate and from two sides of the second connecting plate to the second partition plate; the welding angle of the welding is 6mm, the welding current is 260A, the welding voltage is 28-30V, the welding speed is 500mm/min, the swing frequency is 2.9HZ, the amplitude is 1.3mm, the swing dwell time is 0.1s, the arc closing current is 180A, and the gas flow is 19-25L/min.
Furthermore, in the third step, the joint of the first connecting plate and the second connecting plate with the first partition plate and the second partition plate is subjected to double-sided welding, and the welding line direction is from the first reinforcing plate to the second reinforcing plate; the welding angle of the welding is 8mm, the welding current is 260A, the welding voltage is 28-30V, the welding speed is 500mm/min, the swing frequency is 2.8HZ, the amplitude is 1.3mm, the swing dwell time is 0.1s, the arc closing current is 180A, and the gas flow is 19-25L/min.
Furthermore, in the third step, the joint of the first reinforcing plate and the first partition plate and the joint of the second partition plate are subjected to double-sided welding, and the welding line direction is from the upper end of the first reinforcing plate to the lower end of the first reinforcing plate; the welding angle of the welding is 8mm, the welding current is 260A, the welding voltage is 28-30V, the welding speed is 500mm/min, the swing frequency is 2.8HZ, the amplitude is 1.3mm, the swing dwell time is 0.1s, the arc closing current is 180A, and the gas flow is 19-25L/min.
Furthermore, in the third step, the joint of the second reinforcing plate and the first partition plate and the joint of the second reinforcing plate and the second partition plate are subjected to double-sided welding, and the welding seam is welded from the upper end to the lower end of the second reinforcing plate; the welding angle of the welding is 8mm, the welding current is 260A, the welding voltage is 28-30V, the welding speed is 500mm/min, the swing frequency is 2.8HZ, the amplitude is 1.3mm, the swing dwell time is 0.1s, the arc closing current is 180A, and the gas flow is 19-25L/min.
Further, in the third step, the inclination angle of the welding gun is kept at 75-90 degrees, the included angle of the welding gun is 40-45 degrees, and the dry length of the welding wire is 15 mm.
The scheme of the invention has the following beneficial effects:
1. the welding of the welding seam of the mandrel holder workpiece is automatically finished by 100 percent by a welding robot, the production efficiency is improved by about 40 percent, and the number of workers is reduced by 30 percent;
2. the quality of the welding seam welded by the method is excellent;
3. the time of a single-piece center seat workpiece welded by the method is about 15 minutes, and the efficiency is improved by 1 time compared with that of manual welding;
4. the working conditions are improved, the operator is far away from welding arc light, smog, splashing, high temperature and the like, and the working safety is guaranteed.
Drawings
FIG. 1 is a diagram of a workpiece structure according to the present invention;
FIG. 2 is a welding view of the joint of the first stiffening plate and the first and second connecting plates according to the present invention;
FIG. 3 is a welding view of the joint of the second stiffening plate and the first and second connecting plates according to the present invention;
FIG. 4 is a weld view of the junction of first and second connector plates and first and second separators according to the present invention;
FIG. 5 is a welded view of the joint of the first stiffening plate with the first and second spacers of the present invention;
FIG. 6 is a welded view of the joint of the second reinforcing plate with the first and second separators according to the present invention.
Description of the reference numerals
1-a first connection plate; 2-a second connecting plate; 3-a first separator; 4-a second separator; 5-a first stiffening plate; 6-second stiffening plate.
Detailed Description
To make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
The invention provides a railway wagon center plate seat aiming at the existing problems, which comprises a first connecting plate 1, a second connecting plate 2, a first clapboard 3, a second clapboard 4, a first reinforcing plate 5 and a second reinforcing plate 6, wherein the first connecting plate 2 is arranged on the center plate seat; the first reinforcing plate 5 and the second reinforcing plate 6 are vertically arranged on two sides of the workpiece, the first reinforcing plate 5 and the second reinforcing plate 6 are connected through the first connecting plate 1 and the second connecting plate 5, the first connecting plate 1 and the second connecting plate 5 are positioned at the bottoms of the first reinforcing plate 5 and the second reinforcing plate 6 and are arranged in parallel, the first partition plate 3 and the second partition plate 4 are respectively and vertically connected onto the first connecting plate 1 and the second connecting plate 2, and two ends of the first partition plate 3 and two ends of the second partition plate 4 are connected with the first reinforcing plate 5 and the second reinforcing plate 6;
wherein the first reinforcing plate 5 and the second reinforcing plate 6 have a plate thickness of 10mm, the first connecting plate and the second connecting plate have a plate thickness of 14mm, and the first partition plate and the second partition plate have a plate thickness of 14 mm.
The invention also provides an automatic welding method of the railway freight car chassis, the welding robot body and the control system adopted by the method are both FANUC brand, and the robot model is as follows: FANUC M-10 iA/8L. Robot software: FANUC arc welding software; starting point locating software; weld tracking software. Spot laser locating system: laser sensor, seek the position software. The welding equipment used was a Megemet Artsen-PM500NR welder. The method comprises the following specific steps:
preparing a mandrel base workpiece, wherein a workpiece base material is Q450NQR 1; the welding material is CHW-55CNH, phi 1.2 mm;
secondly, searching positions by adopting a point laser system, and searching positions on the second partition plate 4, the first partition plate 3, the first connecting plate 1 and the second connecting plate 2 in sequence; the position searching mode of the second partition board 4 is that four groups of 1D position searching are vertically carried out on one surface of the second partition board 4, which is opposite to the first partition board 3; the position searching mode of the first partition board 3 is that four groups of 1D position searching are vertically carried out on one surface of the first partition board 3, which is opposite to the second partition board 4; the position searching mode of the first connecting plate 1 and the second connecting plate 2 is to respectively and vertically perform a group of 1D position searching on the upper surfaces of the first connecting plate 1 and the second connecting plate 2.
Thirdly, as shown in fig. 2, performing single-side welding on the joint of the first reinforcing plate 5 and the first connecting plate 1 and the second connecting plate 2 from the inside of the workpiece, wherein the welding seam direction is welding from two sides of the first connecting plate to the first partition plate, and welding from two sides of the second connecting plate 2 to the second partition plate 4; the welding angle of welding is 6mm, the welding current is 260A, the welding voltage is 28-30V, the welding speed is 500mm/min, the swing frequency is 2.9HZ, the amplitude is 1.3mm, the swing dwell time is 0.1s, the arc closing current is 180A, and the gas flow is 19-25L/min;
as shown in fig. 3, the joints of the second reinforcing plate 6 and the first connecting plate 1 and the second connecting plate 2 are welded from the inside of the workpiece on one side, and the welding line direction is from the two sides of the first connecting plate 1 to the first partition plate 3 and from the two sides of the second connecting plate 2 to the second partition plate 4; the welding angle of welding is 6mm, the welding current is 260A, the welding voltage is 28-30V, the welding speed is 500mm/min, the swing frequency is 2.9HZ, the amplitude is 1.3mm, the swing dwell time is 0.1s, the arc closing current is 180A, and the gas flow is 19-25L/min;
as shown in fig. 4, the joints of the first connecting plate 1 and the second connecting plate 2 and the first partition plate 3 and the second partition plate 4 are subjected to double-sided welding, and the welding line direction is from the first reinforcing plate 5 to the second reinforcing plate 6; the welding angle of the welding is 8mm, the welding current is 260A, the welding voltage is 28-30V, the welding speed is 500mm/min, the swing frequency is 2.8HZ, the amplitude is 1.3mm, the swing dwell time is 0.1s, the arc-closing current is 180A, and the gas flow is 19-25L/min;
turning the positioner by 90 degrees clockwise as shown in fig. 5, and performing double-side welding on the joint of the first reinforcing plate 5 and the first partition plate 3 and the second partition plate 4, wherein the welding seam direction is from the upper end to the lower end of the first reinforcing plate 5; the welding angle of welding is 8mm, the welding current is 260A, the welding voltage is 28-30V, the welding speed is 500mm/min, the swing frequency is 2.8HZ, the amplitude is 1.3mm, the swing dwell time is 0.1s, the arc closing current is 180A, and the gas flow is 19-25L/min;
as shown in fig. 6, the positioner is turned over by 180 degrees counterclockwise, the joint of the second reinforcing plate 6 and the first partition plate 3 and the second partition plate 4 is subjected to double-sided welding, and the welding seam direction is from the upper end to the lower end of the second reinforcing plate 6; the welding angle of welding is 8mm, the welding current is 260A, the welding voltage is 28-30V, the welding speed is 500mm/min, the swing frequency is 2.8HZ, the amplitude is 1.3mm, the swing dwell time is 0.1s, the arc closing current is 180A, and the gas flow is 19-25L/min;
and step four, turning the positioner by 90 degrees clockwise, completing welding and cleaning splashing.
And in the third step, the inclination angle of a welding gun is kept at 75-90 degrees, the included angle of the welding gun is kept at 40-45 degrees, and the dry length of the welding wire is 15 mm.
While the foregoing is directed to the preferred embodiment of the present invention, it will be appreciated by those skilled in the art that various changes and modifications may be made therein without departing from the principles of the invention as set forth in the appended claims.
Claims (10)
1. A center plate seat of a railway wagon is characterized by comprising a first connecting plate, a second connecting plate, a first partition plate, a second partition plate, a first reinforcing plate and a second reinforcing plate; first stiffening plate and the vertical locating of second stiffening plate work piece both sides, pass through between first stiffening plate and the second stiffening plate first connecting plate and second connecting plate are connected, first connecting plate and second connecting plate are located first stiffening plate and second stiffening plate bottom and parallel arrangement, first baffle and second baffle connect perpendicularly respectively in on first connecting plate and the second connecting plate, first baffle and second baffle both ends with first stiffening plate and second stiffening plate are connected.
2. The mandrel holder according to claim 1 wherein the plate thickness of the first reinforcing plate and the second reinforcing plate is 10mm, the plate thickness of the first connecting plate and the second connecting plate is 14mm, and the plate thickness of the first partition plate and the second partition plate is 14 mm.
3. A method for the automated welding of a railway wagon deck as defined in any one of claims 1 and 2, comprising:
step one, preparing a mandrel seat workpiece;
secondly, searching positions by adopting a point laser system, and searching positions on a second partition plate, a first connecting plate and a second connecting plate in sequence;
step three, welding the workpiece, wherein the welding sequence is as follows: the joint of the first reinforcing plate and the first connecting plate and the second connecting plate, the joint of the second reinforcing plate and the first connecting plate and the second connecting plate, the joint of the first connecting plate and the second connecting plate and the first clapboard and the second clapboard, the positioner turns over 90 degrees clockwise, the joint of the first reinforcing plate and the first clapboard and the second clapboard, the positioner turns over 180 degrees anticlockwise, and the joint of the second reinforcing plate and the first clapboard and the second clapboard;
and step four, the positioner turns 90 degrees clockwise to complete welding and clear up splashes.
4. The welding method according to claim 3, wherein in the second step, the second partition plate is positioned in a way that four sets of 1D positioning are vertically performed on one surface of the second partition plate, which faces away from the first partition plate; the position searching mode of the first partition plate is that four groups of 1D position searching are vertically carried out on one surface of the first partition plate, which is back to the second partition plate; the position searching mode of the first connecting plate and the second connecting plate is that a group of 1D position searching is respectively and vertically carried out on the upper surfaces of the first connecting plate and the second connecting plate.
5. The welding method according to claim 3, wherein in the third step, the joints of the first reinforcing plate and the first and second connecting plates are welded from the inside of the workpiece in a single-side welding direction, and the welding direction is from both sides of the first connecting plate to the first separator and from both sides of the second connecting plate to the second separator; the welding angle of the welding is 6mm, the welding current is 260A, the welding voltage is 28-30V, the welding speed is 500mm/min, the swing frequency is 2.9HZ, the amplitude is 1.3mm, the swing dwell time is 0.1s, the arc closing current is 180A, and the gas flow is 19-25L/min.
6. The welding method according to claim 3, wherein in the third step, the joint of the second reinforcing plate and the first connecting plate and the second connecting plate is subjected to single-side welding from the inside of the workpiece, and the welding line is in the direction from two sides of the first connecting plate to the first partition plate and from two sides of the second connecting plate to the second partition plate; the welding angle of the welding is 6mm, the welding current is 260A, the welding voltage is 28-30V, the welding speed is 500mm/min, the swing frequency is 2.9HZ, the amplitude is 1.3mm, the swing dwell time is 0.1s, the arc-closing current is 180A, and the gas flow is 19-25L/min.
7. The welding method according to claim 3, wherein in the third step, the joints of the first and second connecting plates and the first and second separators are subjected to double-sided welding, and the welding line is in the direction from the first reinforcing plate to the second reinforcing plate; the welding angle of the welding is 8mm, the welding current is 260A, the welding voltage is 28-30V, the welding speed is 500mm/min, the swing frequency is 2.8HZ, the amplitude is 1.3mm, the swing dwell time is 0.1s, the arc closing current is 180A, and the gas flow is 19-25L/min.
8. The welding method according to claim 3, wherein in the third step, the joint of the first reinforcing plate and the first and second partition plates is subjected to double-sided welding, and the welding seam is in a direction from the upper end to the lower end of the first reinforcing plate; the welding angle of the welding is 8mm, the welding current is 260A, the welding voltage is 28-30V, the welding speed is 500mm/min, the swing frequency is 2.8HZ, the amplitude is 1.3mm, the swing dwell time is 0.1s, the arc closing current is 180A, and the gas flow is 19-25L/min.
9. The welding method according to claim 3, wherein in the third step, the joint of the second reinforcing plate and the first partition plate and the second partition plate is subjected to double-sided welding, and the welding seam is in a direction from the upper end to the lower end of the second reinforcing plate; the welding angle of the welding is 8mm, the welding current is 260A, the welding voltage is 28-30V, the welding speed is 500mm/min, the swing frequency is 2.8HZ, the amplitude is 1.3mm, the swing dwell time is 0.1s, the arc closing current is 180A, and the gas flow is 19-25L/min.
10. The welding method of claim 3, wherein in the third step, the inclination angle of the welding gun is kept between 75 and 90 degrees, the included angle of the welding gun is kept between 40 and 45 degrees, and the dry length of the welding wire is 15 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110232013.1A CN114985869B (en) | 2021-03-02 | 2021-03-02 | Railway wagon center plate seat and automatic welding method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110232013.1A CN114985869B (en) | 2021-03-02 | 2021-03-02 | Railway wagon center plate seat and automatic welding method thereof |
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| Publication Number | Publication Date |
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| CN114985869A true CN114985869A (en) | 2022-09-02 |
| CN114985869B CN114985869B (en) | 2023-08-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110232013.1A Active CN114985869B (en) | 2021-03-02 | 2021-03-02 | Railway wagon center plate seat and automatic welding method thereof |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102358312A (en) * | 2011-08-26 | 2012-02-22 | 齐齐哈尔轨道交通装备有限责任公司 | Railway vehicle chassis and railway vehicle |
| CN102963370A (en) * | 2011-09-02 | 2013-03-13 | 西安轨道交通装备有限责任公司 | Traction and bolster center plate structure of railway tank car |
| CN103203556A (en) * | 2013-04-03 | 2013-07-17 | 齐齐哈尔鑫拓金属铆焊有限责任公司 | Technology for assembling and welding upper center pans and lower cover plates of center frame of railway van truck |
| KR20180052050A (en) * | 2016-11-09 | 2018-05-17 | 박동도 | Automatic welding device of safety footboard |
| CN108944981A (en) * | 2018-07-27 | 2018-12-07 | 中车长江车辆有限公司 | Hitch and frame assembly and road rail vehicle |
| CN111252104A (en) * | 2020-01-21 | 2020-06-09 | 中车山东机车车辆有限公司 | Traction beam of railway piggyback transport vehicle |
-
2021
- 2021-03-02 CN CN202110232013.1A patent/CN114985869B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102358312A (en) * | 2011-08-26 | 2012-02-22 | 齐齐哈尔轨道交通装备有限责任公司 | Railway vehicle chassis and railway vehicle |
| CN102963370A (en) * | 2011-09-02 | 2013-03-13 | 西安轨道交通装备有限责任公司 | Traction and bolster center plate structure of railway tank car |
| CN103203556A (en) * | 2013-04-03 | 2013-07-17 | 齐齐哈尔鑫拓金属铆焊有限责任公司 | Technology for assembling and welding upper center pans and lower cover plates of center frame of railway van truck |
| KR20180052050A (en) * | 2016-11-09 | 2018-05-17 | 박동도 | Automatic welding device of safety footboard |
| CN108944981A (en) * | 2018-07-27 | 2018-12-07 | 中车长江车辆有限公司 | Hitch and frame assembly and road rail vehicle |
| CN111252104A (en) * | 2020-01-21 | 2020-06-09 | 中车山东机车车辆有限公司 | Traction beam of railway piggyback transport vehicle |
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| CN114985869B (en) | 2023-08-08 |
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