CN205138750U - Protection device for rail vehicle bump test - Google Patents
Protection device for rail vehicle bump test Download PDFInfo
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- CN205138750U CN205138750U CN201520867445.XU CN201520867445U CN205138750U CN 205138750 U CN205138750 U CN 205138750U CN 201520867445 U CN201520867445 U CN 201520867445U CN 205138750 U CN205138750 U CN 205138750U
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- 238000012360 testing method Methods 0.000 title claims abstract description 62
- 230000001681 protective effect Effects 0.000 claims abstract description 79
- 238000009863 impact test Methods 0.000 claims description 29
- 241001669679 Eleotris Species 0.000 claims description 7
- 230000003139 buffering effect Effects 0.000 claims description 5
- 238000002955 isolation Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 13
- 230000001012 protector Effects 0.000 abstract 3
- 229910000831 Steel Inorganic materials 0.000 description 10
- 239000010959 steel Substances 0.000 description 10
- 230000008569 process Effects 0.000 description 8
- 230000000694 effects Effects 0.000 description 5
- 230000009191 jumping Effects 0.000 description 5
- 239000004567 concrete Substances 0.000 description 4
- 238000010276 construction Methods 0.000 description 4
- 239000011150 reinforced concrete Substances 0.000 description 3
- 241001443588 Cottus gobio Species 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000009194 climbing Effects 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 238000003556 assay Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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Abstract
The utility model relates to a protection device for rail vehicle bump test, including testing the vehicle, walking capable track and rigidity backstop wall, the test vehicle moves on walking capable track, and rigidity backstop wall is installed and is being walked to go orbital front end, its characterized in that: still be used for the first order protector, second level protector and the third level protector that protect step by step wheel, bogie and automobile body including highly scaling up in proper order. The utility model discloses to rail vehicle's operation characteristics, designed protection track, protection base, the tertiary safeguard procedures of protection rail that the difference in height is different, solved the safety problem that rail vehicle exists when the bump test through this third grade protective structure, take place to takeoff when bump test, derail, the fold, climb car etc. When responding, three -layer protective structure can play protection personnel, factory building, ground test equipment's safety, has guaranteed the security at the indoor bump test of carrying on.
Description
Technical field
The utility model relates to a kind of protective device of rail vehicle impact test, belongs to crash dynamics experimental technique field.
Background technology
Along with the development of China's track traffic cause, especially EMU at home universal, vehicle operating safety pay attention to by increasing people, and the vehicle collision security in vehicle operating safety is a very important part.
The most opening in the wild of present rail vehicle impact test, even if there is the danger such as derailing in sparse population, because its ground is open, without other buildingss such as factory buildings, therefore do not possess large destructive power, but this mode test condition and result are subject to geographical and environmental impact is larger.
In order to solve this problem, preferably as automobile, vehicle impact test is disposed in the interior, but vehicle impact testing due to quality little, speed is less than 65km/h, its collision adopting common guardrail, hollow pier effectively can prevent vehicle to produce when deviating from, doing vehicle impact testing in indoor is safe.And rail vehicle energy in collision process is large, speed is high, single-unit car quality reaches 15-80t, speed also reaches 60-110km/h, and have rail-guided due to rail vehicle, single-unit vehicle reaches 26m again, during collision, large quality, the testing vehicle of high speed may takeoff, derailing, gauffer, climb the collision responses such as car, wheel rim may be ridden walking rails and cause derailing, even go offline, such testing vehicle can be out of control because losing rail-guided effect, and then generation testing vehicle hits the security incidents such as factory building, therefore necessary safeguard procedures must be taked.
Prior art is only install a set of Anti-hook releasing device on axle box to rail vehicle derailing, but once occur significantly to jump, still track can be extracted together and de-orbit.Periphery due to testing laboratory also has other factory building, road and buildings etc., if not at the effective safety device of indoor configuration, when there is the accident that vehicle derailing is gone out, danger is very large, consequence is hardly imaginable, and the common guardrail adopted in existing impact test obviously can not meet the requirement of shelter of rail vehicle impact test.
Utility model content
The utility model fundamental purpose is to solve the problem, and provides a kind of one-piece construction simple, effectively can implement protection, guarantee the protective device of the rail vehicle impact test of process of the test safety.
For achieving the above object, the technical solution of the utility model is:
A kind of protective device of rail vehicle impact test, comprise testing vehicle, walking rails and rigidity backstop wall, testing vehicle runs on walking rails, rigidity backstop wall is arranged on the front end of walking rails, also comprises the first order protective device, second level protective device and the third level protective device that increase progressively highly successively for protecting step by step wheel, bogie and car body.
Further, described first order protective device is two protection tracks parallel with walking rails, and described protection track is arranged on inner side or the outside of walking rails, and the height of described protection track is used for stopping wheel deflection when wheel off-line higher than walking rails.
Further, described walking rails and protection track are fixedly mounted on the ground of pilot region by brace foundation, described brace foundation comprises supporting course, road bed board, sleeper, support bloom and supporting seat, described supporting course is laid on the ground, road bed board is laid on supporting course, road bed board arranges some sleepers, between two often adjacent sleepers, horizontally set supports bloom, described walking rails is fixed on sleeper and supports on bloom, described supporting seat is weldingly fixed on described support bloom, and described protection track is welded on described supporting seat.
Further, described second level protective device is two protection bases, two protection bases divide the both sides being located at walking rails, are enclosed in wherein by walking rails and testing vehicle, the height of described protection base higher than described first order protective device for stopping bogie transverse movement.
Further, described protection base is recessed to form downwards by facility floor, and described walking rails and testing vehicle are placed in described sunk area.
Further, described third level protective device is the protective fence being arranged on first order protective device and protective device periphery, the second level, protective fence by pilot region with other zone isolation in factory building, the height of described protective fence higher than described second level protective device for stopping that vehicle hits factory building.
Further, described protective fence is made up of several fender piles and energy-absorbing buffering part, is connected between two fender piles by web member.
Further, between two described fender piles, also protection network is provided with.
To sum up content; the protective device of a kind of rail vehicle impact test described in the utility model; for the operation characteristic of rail vehicle; devise the different guard rail of difference in height, protection base, protective fence three grades of safeguard procedures; the safety problem that rail vehicle exists when impact test is solved by these three grades of safeguard structures; when takeofing because of impact test, derail, gauffer, when climbing the responses such as car; three-layer protection structure can play the effect of protection personnel, factory building, ground checkout equipment safety, ensure that the security carrying out impact test in indoor.The utility model is one-piece construction advantages of simple not only, and cost is low, has accomplished the protection of " little derailing " low cost, " derailing greatly " security protection.
Accompanying drawing explanation
Fig. 1 is the structural representation of the utility model protective device;
Fig. 2 is the section structure schematic diagram of the utility model protective device;
Fig. 3 is the utility model walking rails and the mounting structure schematic diagram protecting track.
As shown in Figure 1 to Figure 3, pilot region 1, walking rails 2, testing vehicle 3, rigidity backstop wall 4, protective device 5, protection track 6, supporting layer 7, road bed board 8, protection base 9, protective fence 10, fender pile 11, web member 12, ground 13, sunk area 14, supporting steel plate 15, sleeper 16, weathering 17, drainage channel 18, supports bloom 19.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the utility model is described in further detail:
As depicted in figs. 1 and 2, the protective device of a kind of rail vehicle impact test that the utility model provides, be arranged in the factory building for carrying out impact test, collision is cooked up in factory building, in pilot region 1, walking rails 2 is installed, testing vehicle 3 runs on walking rails 2, walking rails 2 adopts common rail, testing vehicle 3 is driven by trailer system and runs, trailer system can adopt by motor-driven towing vehicle (not shown), and towing vehicle runs equally on walking rails 2.Arrange a rigidity backstop wall 4 in the front of walking rails 2, rigidity backstop wall 4 is fixed in facility floor 13.
Wherein, testing vehicle 3 can need to adopt real rail vehicle according to test, and also can adopt a kind of simplification vehicle, the structure, the organizational systems that simplify vehicle are the same with real vehicles with performance, just scaled dimensionally.Testing vehicle 3 leading section simplified is provided with the coupler and draft gear, conquassation pipe, end energy absorption device etc. that mate with it, car body itself is the same with real vehicles has enough rigidity, each car body is connected by united equipment, and in vehicle collisions, above-mentioned each structure cooperatively interacts absorption energy.Towing vehicle is then arranged on the rear of testing vehicle 3, driven by hauling power device such as motors, the front end of towing vehicle lean testing vehicle 3 afterbody so that drive testing vehicle 3 to run by fixing speed on walking rails 2, and the rigidity backstop wall 4 in front is clashed into setting speed, complete impact test.
In order to obtain more test figure, at the back side of rigidity backstop wall 4, multiple force snesor (not shown) is installed, force snesor is used for detecting each point impact data when testing vehicle 3 clashes into rigidity backstop wall 4, and the installation site of force snesor is determined according to testing requirements.Above pilot region 1, high-speed photography acquisition system etc. can also be installed, whole process be carried out to the operation of testing vehicle 3 and collision process and makes video recording, for later stage displacement calculating amount, speed and acceleration etc.
Protective device 5 is extended along walking rails 2 in pilot region 1, and when carrying out collision performance test to testing vehicle 3, protective device 5 pairs of testing vehicles 3 realize multistage protection, to guarantee process of the test safety.
As depicted in figs. 1 and 2, in the present embodiment, protective device 5 comprises three grades of safeguard procedures altogether, be respectively first order protective device, second level protective device and third level protective device, the height of first order protective device, second level protective device and third level protective device increases progressively setting successively, in order to protect step by step wheel, bogie and car body respectively.
Wherein, first order protective device is two protection tracks 6 of arranging parallel with walking rails 2, protection track 6 adopts common rail, its structure is identical with walking rails 2, but its height is higher than walking rails 2, the rail level height of the rail level distance walking rails 2 of protection track 6 is H1, the numerical value of H1 should be greater than the height of wheel rim, article two, the horizontal range between protection track 6 is L1, article two, the horizontal range between walking rails 2 is L2, article two, protection track 6 can be arranged on the inner side of two walking rails 2 simultaneously, also can be arranged on the outside of two walking rails 2 simultaneously, namely L1 can be greater than L2, also L2 can be less than, in the present embodiment, preferably two protection tracks 6 are arranged on the inner side of walking rails 2, difference between L1 and L2 is unsuitable excessive, cause time excessive wheel jump out rear deviation angle larger time protection track 6 just can work, should difference between control L1 and L2 comparatively suitable within 200mm, to ensure when wheel takeoffs, no matter wheel which direction skew towards left and right, as long as wheel height of jumping is not higher than the height of protection track 6 rail level, protection track 6 can pin wheel, and then effectively suppress the deflection of wheel, protection track 6 is utilized to play rail-guided effect, stop wheel off-line.When normal assays, protection track 6 may be used for the drive unit of traveling towing vehicle.
Second level protective device is two protection bases 9, 9 points, two protection bases are located at the both sides of walking rails 2 and testing vehicle 3, walking rails 2 and testing vehicle 3 are enclosed in wherein, the height of upper surface distance walking rails 2 rail level of protection base 9 is H2, the upper surface of protection base 9 is higher than the rail level protecting track 6, namely H2 is greater than H1, the upper surface simultaneously protecting base 9 is also higher than the height of testing vehicle 3 bogie, the height of H2 is defined as the half being less than wheel diameter, preferably be adopted as 300mm, fundamental purpose deviates from can pin wheel instead of pin bogie once vehicle, because during design, protection base 9 is facility floor, if when the degree of depth is higher than bogie, just too dark, walk about inconvenience in left and right, and wheel can be pinned during 300mm height, enough protective actions can be played equally.When the height that wheel takeoffs is higher than (or when vehicle topples) during H1, protection track 6 cannot pin wheel, now utilize the protection base 9 of both sides to stop bogie transverse movement, and then suppress cross-car skew, move in limited space after making vehicle derailing.
When offseting to one side when vehicle derailing, strength is comparatively large, and in order to better play protective action, protection base 9 adopts reinforced concrete structure.Can at the protection base 9 of on base two reinforced concrete structures in ground 13 of factory building during construction, also the ground of factory building can directly be utilized, ground in pilot region 1 adopts the reinforced concrete structure with suitable thickness, protection base 9 is formed to lower recess by the ground 13 of factory building, so not only can reduce costs, convenient construction, can also avoid the excessive height of testing table, to reduce test difficulty.The bottom of sunk area 14 is for installing walking rails 2 and protection track 6, two sidepieces of sunk area 14 are namely as protection base 9, rigidity backstop wall 4 is also fixedly mounted on the bottom of sunk area 14 front end, and except sunk area 14, other region can use as normal facility floor.
Horizontal range between two protection bases 9 is the width of the carbody that the numerical value of L3, L3 is greater than testing vehicle 3, but not easily excessive, is limited within the scope of the vehicle gauge of standard, moves after making vehicle derailing in limited space.
As shown in Figure 3, walking rails 2 and protection track 6 are fixedly mounted on the bottom of sunk area 14 by brace foundation.In the present embodiment, brace foundation comprises supporting course 7, road bed board 8, sleeper 16, support bloom 19 and supporting seat, first one deck supporting course 7 is laid in the bottom of sunk area 14, supporting course 7 preferably adopts hydraulicity compound, also inductile cement concrete can be adopted, road bed board 8 is laid on supporting course 7, road bed board 8 adopts the xoncrete structure of in-situ continuous pouring, road bed board 8 arranges some bullhead sleepers 16, the support bloom 19 of a horizontally set is also provided with between every two adjacent bullhead sleepers 16, support bloom 19 and preferably adopt channel-section steel, supporting bloom 19 is embedded on road bed board 8 when building, walking rails 2 is fixed on sleeper 16 by fastener, the bottom of walking rails 2 is also welded to connect with support bloom 19 simultaneously.
Support bloom 19 welds supporting seat again, and in the present embodiment, supporting seat is the supporting steel plate 15 of monoblock, and the thickness of supporting steel plate 15 determines the height of protection track 6, and the bottom of protection track 6 is then weldingly fixed on supporting steel plate 15.
Need to be designed to the weathering 17 with constant slope according to draining in the both sides of supporting course 7, the bottom correspondingly in the below of protection base 9 along sunk area 14 arranges many drainage channels 18, and drainage channel 18 leads directly to outside factory building.
Walking rails 2 and protection track 6 are installed on concrete layer and steel plate, to meet the impact test requirement higher to trajectory accuracy, the design standards of the speed per hour 350km/h high-speed iron rail that track demand fulfillment is existing, separately, because protection track 6 must be installed in the middle of common rail, effectively cannot be connected with concrete layer, therefore employing is welded on the steel plate of laying in the middle of track, while meeting trajectory accuracy requirement, the installation of convenient protection track 6.
Third level protective device is the protective fence 10 being arranged on protection track 6 and walking rails 2 periphery, and protective fence 10 is starting point setting extending longitudinally to both sides with the rigidity backstop wall 4 of front end, by pilot region 1 with other zone isolation in factory building.The height of apogee distance walking rails 2 rail level of protective fence 10 is H3, and the height of protective fence 10 is higher than the height protecting base 9, and namely H3 is greater than H2, and the height of protective fence 10 must be greater than the half of height of the carbody, is preferably about 70% of height of the carbody.Because protection base 9 directly utilizes facility floor 13, protective fence 10 is also directly installed in facility floor 13.Protective fence 10 plays last protective action, and when first order protection and second level protection all do not stop testing vehicle 3 roll over offset, the testing vehicle 3 that protective fence 10 can prevent upset or the parts flown out hit factory building, avoid major accident occurs.
In the present embodiment, protective fence 10 is made up of several fender piles 11 and energy-absorbing buffering part (not shown), fender pile 11 is made up of steel pipe+concrete, insert inside, ground 13 bottom it to install, fender pile 11 is installed energy-absorbing buffering part, energy-absorbing buffering part can adopt rubber tyre etc., connected by web member 12 between two fender piles 11, web member 12 also plays certain barrier effect, web member 12 can adopt joist steel, and the two ends of joist steel are bolted on fender pile 11.
In order to improve protective capacities further, be provided with one or more layers protection network (not shown) between two fender piles 11 again, protection network is made up of wire rope or compound substance net.Fender pile 11 overturns for stopping the vehicle gone out, and protection network then can be used for stopping that the widget come off flies out pilot region 1.
Test safety process is described below in detail:
When starting to test, testing vehicle 3 and towing vehicle are positioned on walking rails 2, testing vehicle 3 and towing vehicle run on walking rails 2, the irradiation position of debugging high-speed photography acquisition system, start drive motor simultaneously, driving towing vehicle runs, towing vehicle is along walking rails 2 to testing vehicle 3 direction accelerated motion, the front end of towing vehicle lean testing vehicle 3 afterbody so that drive testing vehicle 3 to run by fixing speed on walking rails 2, after testing vehicle 3 reaches fixing speed, drive motor shuts down, towing vehicle slows down and departs from testing vehicle 3, testing vehicle 3 clashes into the rigidity backstop wall 4 of front end with fixing speed, high-speed photography acquisition system whole process is made video recording, for the later stage, statistical study is carried out to process of the test.
Testing vehicle 3 before the collision or collision rift, if when wheel height of jumping is lower than the first height H 1, wheel is pinned by protection track 6, and then effectively suppress the deflection of wheel, protection track 6 is utilized to play rail-guided effect, stop wheel off-line, to reduce the damage of testing vehicle 3 pairs of walking rails 2, protection track 6 and protection base 9, realize protecting the first order of testing vehicle 3.
If when wheel height of jumping is higher than the first height H 1 but lower than the second height H 2, protection track 6 cannot pin wheel, vehicle will deviate from orbital motion, first order protective device no longer works, now, carried out the protection of the second level by protection base 9, the protection base 9 of both sides can suppress bogie transverse shifting, move in limited space after making vehicle derailing, to reduce the damage to facility floor 13.
If when wheel height of jumping is higher than the second height H 2, testing vehicle 3 can overturn, and go out the sunk area 14 of facility floor and slide to the ground 13 protected above base 9, now, protective fence 10 is utilized to do last protection, fender pile 11 in protective fence 10 is for stopping that overturning the testing vehicle 3 gone out hits factory building, and protection network is for stopping that the widget come off flies out.
This protective device and means of defence are for the operation characteristic of rail vehicle, devise the protection track 6 that difference in height is different, protection base 9, protective fence 10 3 grades of safeguard procedures, the safety problem that rail vehicle exists when impact test is solved by these three grades of safeguard structures, takeoff when impact test, derailing, gauffer, when climbing the responses such as car, three-layer protection structure can play protection personnel, factory building, the safety of ground checkout equipment, ensure that the security carrying out impact test in indoor, and, three grades of protection can when wheel height of jumping be not high, to protection base 9, ground 13 is protected, reduce experimentation cost.
As mentioned above, plan content given by reference to the accompanying drawings, can derive similar technical scheme.In every case be that not depart from originally be the content of utility model technical scheme, any simple modification done above embodiment according to technical spirit of the present utility model, equivalent variations and modification, all still belong in the scope of technical solutions of the utility model.
Claims (8)
1. the protective device of a rail vehicle impact test, comprise testing vehicle, walking rails and rigidity backstop wall, testing vehicle runs on walking rails, rigidity backstop wall is arranged on the front end of walking rails, it is characterized in that: also comprise the first order protective device, second level protective device and the third level protective device that increase progressively highly successively for protecting step by step wheel, bogie and car body.
2. the protective device of a kind of rail vehicle impact test according to claim 1, it is characterized in that: described first order protective device is two protection tracks parallel with walking rails, described protection track is arranged on inner side or the outside of walking rails, and the height of described protection track is used for stopping wheel deflection when wheel off-line higher than walking rails.
3. the protective device of a kind of rail vehicle impact test according to claim 2, it is characterized in that: described walking rails and protection track are fixedly mounted on the ground of pilot region by brace foundation, described brace foundation comprises supporting course, road bed board, sleeper, support bloom and supporting seat, described supporting course is laid on the ground, road bed board is laid on supporting course, road bed board arranges some sleepers, between two often adjacent sleepers, horizontally set supports bloom, described walking rails is fixed on sleeper and supports on bloom, described supporting seat is weldingly fixed on described support bloom, described protection track is welded on described supporting seat.
4. the protective device of a kind of rail vehicle impact test according to claim 1, it is characterized in that: described second level protective device is two protection bases, two protection bases divide the both sides being located at walking rails, walking rails and testing vehicle are enclosed in wherein, the height of described protection base higher than described first order protective device for stopping bogie transverse movement.
5. the protective device of a kind of rail vehicle impact test according to claim 4, is characterized in that: described protection base is recessed to form downwards by facility floor, and described walking rails and testing vehicle are placed in described sunk area.
6. the protective device of a kind of rail vehicle impact test according to claim 1, it is characterized in that: described third level protective device is the protective fence being arranged on first order protective device and protective device periphery, the second level, protective fence by pilot region with other zone isolation in factory building, the height of described protective fence higher than described second level protective device for stopping that vehicle hits factory building.
7. the protective device of a kind of rail vehicle impact test according to claim 6, be is characterized in that: described protective fence is made up of several fender piles and energy-absorbing buffering part, is connected between two fender piles by web member.
8. the protective device of a kind of rail vehicle impact test according to claim 7, is characterized in that: between two described fender piles, be also provided with protection network.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520867445.XU CN205138750U (en) | 2015-11-03 | 2015-11-03 | Protection device for rail vehicle bump test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520867445.XU CN205138750U (en) | 2015-11-03 | 2015-11-03 | Protection device for rail vehicle bump test |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205138750U true CN205138750U (en) | 2016-04-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520867445.XU Expired - Fee Related CN205138750U (en) | 2015-11-03 | 2015-11-03 | Protection device for rail vehicle bump test |
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| Country | Link |
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| CN (1) | CN205138750U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105258901A (en) * | 2015-11-03 | 2016-01-20 | 南车青岛四方机车车辆股份有限公司 | Protection device and method for rail vehicle impact test |
| CN110767013A (en) * | 2019-10-15 | 2020-02-07 | 东莞理工学院 | Rail transit fault diagnosis simulation experiment track device |
| CN113029608A (en) * | 2021-02-01 | 2021-06-25 | 中车青岛四方机车车辆股份有限公司 | Dynamic test system of magnetic track brake |
-
2015
- 2015-11-03 CN CN201520867445.XU patent/CN205138750U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105258901A (en) * | 2015-11-03 | 2016-01-20 | 南车青岛四方机车车辆股份有限公司 | Protection device and method for rail vehicle impact test |
| CN110767013A (en) * | 2019-10-15 | 2020-02-07 | 东莞理工学院 | Rail transit fault diagnosis simulation experiment track device |
| CN113029608A (en) * | 2021-02-01 | 2021-06-25 | 中车青岛四方机车车辆股份有限公司 | Dynamic test system of magnetic track brake |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160406 |
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| CF01 | Termination of patent right due to non-payment of annual fee |