CN103692245A - Crane-type shaft box processing and positioning device - Google Patents
Crane-type shaft box processing and positioning device Download PDFInfo
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- CN103692245A CN103692245A CN201310724648.9A CN201310724648A CN103692245A CN 103692245 A CN103692245 A CN 103692245A CN 201310724648 A CN201310724648 A CN 201310724648A CN 103692245 A CN103692245 A CN 103692245A
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- 238000003754 machining Methods 0.000 claims description 6
- 238000009825 accumulation Methods 0.000 abstract description 3
- 238000009434 installation Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
- B23Q3/02—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine for mounting on a work-table, tool-slide, or analogous part
- B23Q3/06—Work-clamping means
- B23Q3/062—Work-clamping means adapted for holding workpieces having a special form or being made from a special material
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- Mechanical Engineering (AREA)
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Abstract
The invention discloses a crane-type shaft box processing and positioning device which comprises a base (1), a first positioning seat (2), a first press device (4), a second positioning seat (4) and a second press device (5), wherein an installation positioning hole is formed in the base (1), the first positioning seat (2) is arranged on the base (2) and used for positioning a bearing hole of a crane-type shaft box (A), the first press device (4) is arranged on the first positioning seat (2), the second positioning seat (3) is arranged on the base (1) and used for positioning a node hole of the crane-type shaft box (A), and the second press device (5) is arranged on the second positioning seat (3). With the adoption of the crane-type shaft box processing and positioning device provided by the embodiment of the invention, a crane-type shaft box can be positioned relative to a processing device only by positioning the installation positioning hole in the base and all processing devices, error accumulation caused by frequently positioning and clamping the crane-type shaft box is prevented, and the processing accuracy of the crane-type shaft box is further effectively improved.
Description
Technical Field
The invention relates to the technical field of motor train unit equipment, in particular to a rotating arm type shaft box body processing and positioning device.
Background
In the process of machining the knuckle arm type axle box body of the bogie, due to the complex shape of the knuckle arm type axle box body, machining needs to be carried out on multiple surfaces of the knuckle arm type axle box body. Due to the fact that different devices are needed for machining, the rotating arm type shaft box body needs to be clamped for many times in the machining process.
The equipment required for processing the rotating arm type shaft box body comprises a vertical processing center, a planer milling cutter, a numerical control vertical lathe, a rocker drill and the like, and the rotating arm type shaft box body is respectively clamped in the equipment, so that clamping and processing errors on the equipment are accumulated, the processing error of the rotating arm type shaft box body is large, and the rotating arm type shaft box body can not be used even in serious cases.
Therefore, how to improve the processing precision of the swing arm type shaft box body is a problem to be solved urgently by the technical field.
Disclosure of Invention
In view of this, the invention provides a positioning device for processing a swing arm type shaft box body, which improves the processing precision of the swing arm type shaft box body.
In order to achieve the purpose, the invention provides the following technical scheme:
the utility model provides a jib formula axle box processing positioner, includes:
the base is provided with an installation positioning hole;
the first positioning seat is arranged on the base and used for positioning a bearing hole of the rotating arm type shaft box body;
the first pressing device is arranged on the first positioning seat;
the second positioning seat is arranged on the base and used for positioning the node hole of the rotating arm type shaft box body;
and the second pressing device is arranged on the second positioning seat.
Preferably, the device for processing and positioning the swing-arm-type shaft box further comprises an adjusting seat arranged between the first positioning seat and the second positioning seat and used for transverse alignment of the swing-arm-type shaft box.
Preferably, in the above-mentioned swing arm type shaft box processing and positioning device, the adjusting seat includes a supporting seat fixedly disposed on the base and a fastening screw device disposed on the supporting seat;
the number of the fastening screw devices is two, the fastening screw devices are arranged oppositely, and the arrangement direction of the two fastening screw devices is perpendicular to the arrangement direction of the first pressing device and the second pressing device.
Preferably, in the above-mentioned jib-type shaft box processing and positioning device, the support seat is connected with the base by a bolt;
the supporting seat and the base are positioned through a positioning pin.
Preferably, in the above-mentioned jib-type shaft box processing and positioning device, the first pressing device includes a first connecting rod disposed on the first positioning seat, a first pressing block sleeved on the first connecting rod, and a first nut in threaded fit with the first connecting rod;
the second pressing device comprises a second connecting rod arranged on the second positioning seat, a second pressing block sleeved on the second connecting rod and a second nut in threaded fit with the second connecting rod.
Preferably, in the above-mentioned swing arm type shaft box processing and positioning device, the first connecting rod is disposed at the center of the first positioning seat; the second connecting rod is arranged in the center of the second positioning seat.
Preferably, in the above-mentioned jib-type shaft box processing positioning device, the first pressing block has a through hole through which the first nut passes, a positioning snap ring is disposed between the first nut and the first pressing block, and the positioning snap ring has an opening through which the first link passes;
the diameter of the outer ring of the positioning clamping ring is larger than that of the through hole, and the diameter of the inner ring of the positioning clamping ring is smaller than that of the circumscribed circle of the first nut.
Preferably, in the above-mentioned jib-type shaft box processing and positioning device, the first pressing block is a circular pressing block; and a handle is arranged on the first pressing block.
Preferably, in the above-mentioned jib type shaft box processing positioner, the second pressing block has a slot through which the second connecting rod passes.
Preferably, in the above-mentioned jib type shaft box processing and positioning device, both the first positioning seat and the second positioning seat are connected to the base through bolts; the first positioning seat and the second positioning seat are positioned with the base through positioning pins.
According to the technical scheme, when the rotating arm type shaft box body is assembled on the rotating arm type shaft box body processing and positioning device provided by the embodiment of the invention, the rotating arm type shaft box body is processed to complete the bearing hole and the node hole. Sleeving a bearing hole of the rotating arm type shaft box body on a first positioning seat, enabling the outer wall of the first positioning seat to be in contact with the inner wall of the bearing hole, and pressing one end, provided with the bearing hole, of the rotating arm type shaft box body to the top surface of the base through a first pressing device; meanwhile, a node hole of the rotating arm type shaft box body is sleeved on the second positioning seat, so that the outer wall of the second positioning seat is in contact with the inner wall of the node hole, and the end, provided with the node hole, of the rotating arm type shaft box body is pressed towards the top surface of the base through the second pressing device. By adopting one-surface two-pin type positioning placement, the mounting position accuracy of the swing arm type shaft box body on the swing arm type shaft box body processing and positioning device provided by the embodiment of the invention is greatly improved. According to the processing and positioning device for the swing arm type shaft box body provided by the embodiment of the invention, the swing arm type shaft box body can be positioned relative to the processing devices only through positioning between the mounting positioning holes of the base and each processing device, so that error accumulation caused by multiple positioning and clamping of the swing arm type shaft box body is avoided, and the processing precision of the swing arm type shaft box body is effectively improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is an assembly schematic view of a jib type shaft box processing and positioning device and a jib type shaft box provided by an embodiment of the invention;
fig. 2 is an assembly front view of the jib type shaft box processing and positioning device and the jib type shaft box provided by the embodiment of the invention;
fig. 3 is a schematic front view of a rotating arm type shaft box processing and positioning device according to an embodiment of the present invention;
fig. 4 is a schematic top view of a rotating arm type axle box processing and positioning device according to an embodiment of the present invention.
Wherein,
the device comprises a base-1, a first positioning seat-2, a second positioning seat-3, a first pressing device-4, a second pressing device-5, an adjusting seat-6, a supporting seat-61, a fastening screw device-62 and a rotating arm type shaft box body-A.
Detailed Description
The invention discloses a processing and positioning device for a rotating arm type shaft box body, which improves the processing precision of the rotating arm type shaft box body.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 to 4, fig. 1 is an assembly schematic view of a jib type shaft box processing and positioning device and a jib type shaft box according to an embodiment of the present invention; fig. 2 is an assembly front view of the jib type shaft box processing and positioning device and the jib type shaft box provided by the embodiment of the invention; fig. 3 is a schematic front view of a rotating arm type shaft box processing and positioning device according to an embodiment of the present invention; fig. 4 is a schematic top view of a rotating arm type axle box processing and positioning device according to an embodiment of the present invention.
The invention provides a rotating arm type shaft box processing and positioning device, which comprises: the device comprises a base 1, wherein a mounting positioning hole is formed in the base 1; the first positioning seat 2 is arranged on the base 1 and used for positioning a bearing hole of the rotating arm type shaft box body A; the first pressing device 4 is arranged on the first positioning seat 2; the second positioning seat 3 is arranged on the base 1 and used for positioning a node hole of the rotating arm type shaft box body A; and the second pressing device 5 is arranged on the second positioning seat 3.
As shown in fig. 1 and fig. 2, when the swing arm type shaft box body a is assembled on the swing arm type shaft box body processing and positioning device provided by the embodiment of the present invention, the swing arm type shaft box body a is already processed to complete the bearing hole and the node hole. Sleeving a bearing hole of the swing arm type shaft box body A on the first positioning seat 2, enabling the outer wall of the first positioning seat 2 to be in contact with the inner wall of the bearing hole, and pressing the end, provided with the bearing hole, of the swing arm type shaft box body A to the top surface of the base 1 through the first pressing device 4; meanwhile, a node hole of the swing arm type shaft box body A is sleeved on the second positioning seat 3, so that the outer wall of the second positioning seat 3 is in contact with the inner wall of the node hole, and the end, provided with the node hole, of the swing arm type shaft box body A is pressed towards the top surface of the base 1 through the second pressing device 5. By adopting one-surface two-pin type positioning placement, the mounting position accuracy of the swing arm type shaft box body A on the swing arm type shaft box body processing and positioning device provided by the embodiment of the invention is greatly improved. According to the processing and positioning device for the swing-arm-type shaft box body, the swing-arm-type shaft box body A can be positioned relative to the processing devices only through positioning between the mounting positioning holes of the base 1 and the processing devices, error accumulation caused by multiple positioning and clamping of the swing-arm-type shaft box body A is avoided, and the processing precision of the swing-arm-type shaft box body A is effectively improved.
Further, the device for processing and positioning the swing-arm-type shaft box body provided by the embodiment of the invention further comprises an adjusting seat 6 which is arranged between the first positioning seat 2 and the second positioning seat 3 and is used for transversely aligning the swing-arm-type shaft box body A. Through setting up adjustment seat 6, further to the position control on the range direction of jib type axle box A perpendicular to first positioning seat 2 and second positioning seat 3 on base 1, further the mounted position accuracy of jib type axle box A on jib type axle box processing positioner. The transverse direction of the transverse alignment of the rotating arm type shaft box body A is vertical to the arrangement direction of the first positioning seat 2 and the second positioning seat 3.
As shown in fig. 3 and 4, the adjusting seat 6 includes a supporting seat 61 fixedly disposed on the base 1 and a fastening screw device 62 disposed on the supporting seat 61; the number of the fastening screw devices 62 is two and the two fastening screw devices 62 are arranged oppositely, and the arrangement direction of the two fastening screw devices 62 is perpendicular to the arrangement direction of the first pressing device 4 and the second pressing device 5. After the two ends of the swing arm type shaft box body A are respectively fixed on the first positioning seat 2 and the second positioning seat 3, the middle part of the swing arm type shaft box body A is positioned between the two fastening screw devices 62, and the screw end parts of the two fastening screw devices 62 are abutted against the two sides of the swing arm type shaft box body A by adjusting the two fastening screw devices 62, so that the transverse alignment of the swing arm type shaft box body A is completed.
Preferably, the supporting seat 61 is connected with the base 1 through bolts; the supporting seat 61 and the base 1 are positioned by a positioning pin.
In the processing and positioning device for the swing arm type shaft box body provided by the embodiment of the invention, the first pressing device 4 comprises a first connecting rod arranged on the first positioning seat 2, a first pressing block sleeved on the first connecting rod and a first nut in threaded fit with the first connecting rod, and the effect that the first pressing block presses one end, provided with a bearing hole, of the swing arm type shaft box body A to the base 1 is achieved by screwing the first nut relative to the first connecting rod; the second pressing device 5 comprises a second connecting rod arranged on the second positioning seat 3, a second pressing block sleeved on the second connecting rod, and a second nut in threaded fit with the second connecting rod, and the second pressing block is screwed relative to the second connecting rod through the second nut to press one end, provided with a node hole, of the rotating arm type shaft box body A to the base 1.
In order to make the pressing force uniform, the first link is preferably arranged in the center of the first positioning base 2; the second connecting rod is disposed in the center of the second positioning seat 3.
As shown in fig. 1 and 4, the first pressing block has a through hole for the first nut to pass through, a positioning snap ring is arranged between the first nut and the first pressing block, and the positioning snap ring has an opening for the first connecting rod to pass through; the diameter of the outer ring of the positioning clamping ring is larger than that of the through hole, and the diameter of the inner ring of the positioning clamping ring is smaller than that of the circumscribed circle of the first nut. The first nut is always installed on the first connecting rod, in the process of assembling the rotating arm type shaft box body A, a bearing hole of the rotating arm type shaft box body A penetrates through the first connecting rod provided with the first nut, the first connecting rod is located on the first locating seat 2, the first pressing block is arranged on the rotating arm type shaft box body A, the first nut penetrates through a through hole of the first pressing block, the locating snap ring is arranged between the first pressing block and the first nut, the first connecting rod penetrates through an opening of the locating snap ring to be sleeved into the locating snap ring to be screwed inside the first nut, the first nut is extruded to the first pressing block by the first pressing block to the base 1, and the pressing operation is completed.
In this embodiment, in order to further improve the uniformity of the pressing force, the first pressing block is a circular pressing block. In order to facilitate the carrying of the first pressing block, a handle is arranged on the first pressing block.
As shown in fig. 4, the second pressing block has a catching groove through which the second link passes. Through setting up the draw-in groove for the second nut is installed on the second connecting rod all the time, only needs to pass the second connecting rod that is provided with the second nut with the node hole of jib formula axle box A, and the second compact heap sets up between second nut and jib formula axle box A, and the second connecting rod passes through the draw-in groove cover and locates in the second compact heap, and furtherly can set up the gasket between second nut and second compact heap.
In the embodiment, in order to improve the mounting and positioning accuracy, the first positioning seat 2 and the second positioning seat 3 are both connected with the base 1 through bolts; the first positioning seat 2 and the second positioning seat 3 are positioned with the base 1 by positioning pins.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The utility model provides a jib formula axle box processing positioner which characterized in that includes:
the device comprises a base (1), wherein a mounting positioning hole is formed in the base (1);
the first positioning seat (2) is arranged on the base (1) and used for positioning a bearing hole of the rotating arm type shaft box body (A);
the first pressing device (4) is arranged on the first positioning seat (2);
the second positioning seat (3) is arranged on the base (1) and used for positioning a node hole of the rotating arm type shaft box body (A);
and the second pressing device (5) is arranged on the second positioning seat (3).
2. The machining and positioning device for the swing-arm type axle box body according to claim 1, further comprising an adjusting seat (6) arranged between the first positioning seat (2) and the second positioning seat (3) and used for transverse alignment of the swing-arm type axle box body A.
3. The swing-arm type axle box processing and positioning device of claim 2, wherein the adjusting seat (6) comprises a supporting seat (61) fixedly arranged on the base (1) and a fastening screw device (62) arranged on the supporting seat (61);
the number of the fastening screw devices (62) is two, the fastening screw devices are arranged oppositely, and the arrangement direction of the two fastening screw devices (62) is perpendicular to the arrangement direction of the first pressing device (4) and the second pressing device (5).
4. The swing-arm type axle box processing and positioning device of claim 3, wherein the supporting seat (61) is connected with the base (1) through bolts;
the supporting seat (61) and the base (1) are positioned through positioning pins.
5. The swing arm type axle box processing and positioning device of claim 1, wherein the first pressing device (4) comprises a first connecting rod arranged on the first positioning seat (2), a first pressing block sleeved on the first connecting rod and a first nut in threaded fit with the first connecting rod;
the second pressing device (5) comprises a second connecting rod arranged on the second positioning seat (3), a second pressing block sleeved on the second connecting rod and a second nut in threaded fit with the second connecting rod.
6. The swivel-arm type axle box processing and positioning device of claim 5, wherein the first connecting rod is arranged at the center of the first positioning seat (2); the second connecting rod is arranged in the center of the second positioning seat (3).
7. The swing arm type axle box body processing and positioning device as claimed in claim 5, wherein the first pressing block is provided with a through hole for the first nut to pass through, a positioning snap ring is arranged between the first nut and the first pressing block, and the positioning snap ring is provided with an opening for the first connecting rod to pass through;
the diameter of the outer ring of the positioning clamping ring is larger than that of the through hole, and the diameter of the inner ring of the positioning clamping ring is smaller than that of the circumscribed circle of the first nut.
8. The swing arm type shaft box body processing and positioning device as claimed in claim 7, wherein the first pressing block is a circular pressing block; and a handle is arranged on the first pressing block.
9. The swing arm type axle box body processing and positioning device of any one of claims 5 to 7, wherein the second pressing block is provided with a clamping groove for the second connecting rod to pass through.
10. The machining and positioning device for the swing-arm type shaft box body according to claim 1, characterized in that the first positioning seat (2) and the second positioning seat (3) are both connected with the base (1) through bolts; the first positioning seat (2) and the second positioning seat (3) are positioned with the base (1) through positioning pins.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310724648.9A CN103692245A (en) | 2013-12-24 | 2013-12-24 | Crane-type shaft box processing and positioning device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310724648.9A CN103692245A (en) | 2013-12-24 | 2013-12-24 | Crane-type shaft box processing and positioning device |
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| Publication Number | Publication Date |
|---|---|
| CN103692245A true CN103692245A (en) | 2014-04-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310724648.9A Pending CN103692245A (en) | 2013-12-24 | 2013-12-24 | Crane-type shaft box processing and positioning device |
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| CN (1) | CN103692245A (en) |
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| CN104034542A (en) * | 2014-06-23 | 2014-09-10 | 常州华德机械有限公司 | Fatigue test tool for high-speed train bogie journal box |
| CN104354024A (en) * | 2014-10-22 | 2015-02-18 | 江苏万盛铸造有限公司 | Cam box processing and clamping device |
| CN104440217A (en) * | 2014-11-07 | 2015-03-25 | 江苏万盛铸造有限公司 | Cam box machining, clamping and positioning device |
| CN104608789A (en) * | 2015-01-16 | 2015-05-13 | 南车青岛四方机车车辆股份有限公司 | Rail train and shaft box structure thereof |
| CN105171447A (en) * | 2015-04-28 | 2015-12-23 | 中国人民解放军第五七二一工厂 | Positioning clamp and method for machining inner circle face of orthogonal shaft sleeve |
| CN105328488A (en) * | 2015-12-09 | 2016-02-17 | 苏州新锐合金工具股份有限公司 | Datum plane and hole processing clamp for tricone bit legs |
| CN106695386A (en) * | 2016-12-28 | 2017-05-24 | 齐齐哈尔雷昂重工机械制造有限责任公司 | Train truck bogie hole machining tool |
| CN106826284A (en) * | 2016-12-28 | 2017-06-13 | 齐齐哈尔雷昂重工机械制造有限责任公司 | Train wagons bogie processes bottom surface frock |
| US9744976B2 (en) | 2015-01-16 | 2017-08-29 | Crrc Qingdao Sifang Co., Ltd. | Railway vehicle and axle box structure thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104034542A (en) * | 2014-06-23 | 2014-09-10 | 常州华德机械有限公司 | Fatigue test tool for high-speed train bogie journal box |
| CN104354024A (en) * | 2014-10-22 | 2015-02-18 | 江苏万盛铸造有限公司 | Cam box processing and clamping device |
| CN104440217A (en) * | 2014-11-07 | 2015-03-25 | 江苏万盛铸造有限公司 | Cam box machining, clamping and positioning device |
| US9744976B2 (en) | 2015-01-16 | 2017-08-29 | Crrc Qingdao Sifang Co., Ltd. | Railway vehicle and axle box structure thereof |
| CN104608789A (en) * | 2015-01-16 | 2015-05-13 | 南车青岛四方机车车辆股份有限公司 | Rail train and shaft box structure thereof |
| CN105171447A (en) * | 2015-04-28 | 2015-12-23 | 中国人民解放军第五七二一工厂 | Positioning clamp and method for machining inner circle face of orthogonal shaft sleeve |
| CN105328488B (en) * | 2015-12-09 | 2017-12-19 | 苏州新锐合金工具股份有限公司 | Tricone bit bit leg reference plane, hole processing clamp |
| CN105328488A (en) * | 2015-12-09 | 2016-02-17 | 苏州新锐合金工具股份有限公司 | Datum plane and hole processing clamp for tricone bit legs |
| CN106826284A (en) * | 2016-12-28 | 2017-06-13 | 齐齐哈尔雷昂重工机械制造有限责任公司 | Train wagons bogie processes bottom surface frock |
| CN106695386A (en) * | 2016-12-28 | 2017-05-24 | 齐齐哈尔雷昂重工机械制造有限责任公司 | Train truck bogie hole machining tool |
| CN107838714A (en) * | 2017-11-01 | 2018-03-27 | 中车长江铜陵车辆有限公司 | A kind of borehole positioning apparatus of rail vehicle truck pivoted arm |
| CN109483269A (en) * | 2019-01-03 | 2019-03-19 | 常德市艾锐科机电有限公司 | A kind of frock clamp of the adjustment attachment base with screw rod |
| CN111941109A (en) * | 2020-06-28 | 2020-11-17 | 北京实验工厂有限责任公司 | Positioning and clamping device for high-precision space vertical hole turning |
| CN113369921A (en) * | 2021-06-21 | 2021-09-10 | 长春中车轨道车辆有限公司 | EMUs axle box node spot facing work frock |
| CN113369921B (en) * | 2021-06-21 | 2022-09-20 | 长春中车轨道车辆有限公司 | EMUs axle box node hole processing frock |
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Address after: Chengyang District of Shandong city of Qingdao province Jinhong road 266111 No. 88 Applicant after: CRRC QINGDAO SIFANG CO., LTD. Address before: Chengyang District of Shandong city of Qingdao province Jinhong road 266111 No. 88 Applicant before: CSR Qingdao Sifang Locomotive and Rolling Stock Co., Ltd. |
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Application publication date: 20140402 |