CN213424756U - Suspension electromagnet assembly for medium-low speed maglev train - Google Patents
Suspension electromagnet assembly for medium-low speed maglev train Download PDFInfo
- Publication number
- CN213424756U CN213424756U CN202022559924.9U CN202022559924U CN213424756U CN 213424756 U CN213424756 U CN 213424756U CN 202022559924 U CN202022559924 U CN 202022559924U CN 213424756 U CN213424756 U CN 213424756U
- Authority
- CN
- China
- Prior art keywords
- polar plate
- skid
- gap
- plate
- low speed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Braking Arrangements (AREA)
Abstract
The utility model relates to a maglev train technical field, concretely relates to suspension electromagnet assembly for well low-speed maglev train, including inboard polar plate, outside polar plate, four electromagnet coil, hydraulic pressure braking pincers, first horizontal skid, the horizontal skid of second and two clearance sensor modules, four electromagnet coil evenly set gradually between inboard polar plate and outside polar plate along polar plate length direction, and be equipped with first clearance between the electromagnet coil in proper order, second clearance and third clearance, the clearance sensor module sets up the both ends at the polar plate respectively, inboard polar plate, the bottom of outside polar plate all is provided with the protruding portion. The utility model discloses a bottom at inboard polar plate, outside polar plate all is provided with the protruding portion to let the height of protruding portion reduce gradually to both sides from the centre, utilize the protruding portion to carry out the performance to the polar plate and complement, carry out the biggest reinforcing at the great middle part of polar plate trompil, effectively increase the bending resistance of polar plate, improve the security and the stability of suspension frame.
Description
Technical Field
The utility model relates to a maglev train technical field, concretely relates to suspension electromagnet assembly for well low-speed maglev train.
Background
With the rapid development of social economy, magnetic levitation traffic has great advantages in solving the increasing travel demands of people, and is one of the best schemes for solving urban traffic congestion. In the existing rail transit mode, a high-speed train, a motor train and a heavy-duty train are mainly used for medium and long distance traffic demands, and subways are adopted between cities and inside cities. While bringing certain convenience, the disadvantages of large noise, low running speed, high manufacturing cost and the like of the subway are more and more obvious. The medium-low speed magnetic levitation traffic system has the advantages of safety, comfort, environmental protection, rapidness, convenience, easy maintenance and the like, is suitable for a traffic main line and an extension line of a central city with medium and low traffic volume, such as a special rapid line connected with an airport, a suburban area, an industrial area, a large entertainment place and the like, and is also suitable for an auxiliary line of a large and medium city with crowded buildings and difficult line arrangement.
The suspension electromagnet is used as one of important components of a medium-low speed maglev train, in the existing suspension electromagnet technology, for example, a suspension electromagnet of a medium-low speed maglev train disclosed in chinese patent publication No. CN104228604A, and comprises an inner polar plate and an outer polar plate which are oppositely arranged at intervals, wherein more than one iron core is connected in the interval between the inner polar plate and the outer polar plate, a coil is wound on the iron core, and outer side bulging parts are respectively arranged on the outer surfaces of the inner polar plate and the outer polar plate; the suspension electromagnet of the medium-low speed maglev train can effectively reduce the magnetic saturation in partial areas and improve the suspension force; however, in the suspension electromagnet, the pole plate needs to be provided with a hole for installing components such as an electromagnet coil, and the like, and the installation holes can reduce the bending resistance of the pole plate, which causes the safety performance of the suspension frame to be reduced.
Therefore, the utility model provides a simple structure, it is convenient to use, effectively increases the bending resistance of polar plate, improves the suspension frame the security and the suspension electromagnet assembly who is used for medium and low speed maglev train of stability.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art not enough, provide a suspension electromagnet assembly for well low-speed maglev train, all be provided with the protruding portion through the bottom of inboard polar plate, the bottom of outside polar plate to let the height of protruding portion reduce gradually to both sides from the centre, utilize the protruding portion to carry out the performance to the polar plate and complement, carry out the biggest reinforcing at the great middle part of polar plate trompil, effectively increase the bending resistance of polar plate, improve the security and the stability of suspension frame.
The purpose of the utility model is realized through the following technical scheme:
a suspension electromagnet assembly for a medium-low speed maglev train comprises an inner side polar plate, an outer side polar plate, four electromagnet coils, a hydraulic brake caliper, a first transverse skid, a second transverse skid and two gap sensor modules, wherein the four electromagnet coils are sequentially and uniformly arranged between the inner side polar plate and the outer side polar plate along the length direction of the polar plate, a first gap, a second gap and a third gap are sequentially arranged between the electromagnet coils, the first transverse skid is arranged on the outer side polar plate corresponding to the first gap, the hydraulic brake caliper is arranged corresponding to the second gap, the hydraulic brake caliper is connected with the inner side polar plate and the outer side polar plate in an installing manner, the second transverse skid is arranged on the outer side polar plate corresponding to the third gap, the gap sensor modules are respectively arranged at two ends of the polar plate, the gap sensor modules are used for detecting the suspension gap, and protruding parts are respectively arranged at the bottom of the inner side polar plate and the bottom, the height of the protruding part is gradually reduced from the middle to both sides. In the practical use process, because the electromagnet coil, the hydraulic brake caliper, the first transverse skid and the second transverse skid need to be fixedly arranged on the pole plate, therefore, mounting holes for mounting an electromagnet coil and a hydraulic brake caliper are arranged on the inner polar plate and the outer polar plate, meanwhile, the outer polar plate is also provided with a mounting hole for mounting the first transverse skid and the second transverse skid, the arrangement of a plurality of mounting holes can reduce the bending resistance of the polar plate and influence the safety performance of the suspension frame, in order to solve the technical problem, the bottom of the inner polar plate and the bottom of the outer polar plate are both provided with the protruding parts, the height of the protruding parts is gradually reduced from the middle to the two sides, the protruding parts are utilized to complement the improvement performance of the polar plates, the central part with larger openings of the polar plate is reinforced to the maximum, so that the bending resistance of the polar plate is effectively improved, and the safety and the stability of the suspension frame are improved.
Further, the hydraulic brake caliper is connected with the first transverse skid or the second transverse skid through a brake lever. Preferably, the hydraulic brake caliper is connected with the rear transverse skid through a brake rod along the running direction of the train, when the train needs to be braked by the hydraulic brake caliper, the hydraulic brake caliper is started to work, the rail is clamped by the clamp of the hydraulic brake caliper, the train is decelerated and braked by increasing the friction force between the suspension frame and the rail, meanwhile, the friction force can drive the hydraulic brake caliper to move forwards, in order to ensure the safe use of the hydraulic brake caliper, the hydraulic brake caliper is connected with the rear transverse skid through the brake rod, the rear transverse skid applies pulling force to the hydraulic brake caliper through the brake rod to prevent the hydraulic brake caliper from moving forwards, the hydraulic brake caliper is protected to stably and safely clamp the rail for braking, meanwhile, the influence of the friction force on the pole plate is further dispersed, and the use safety of the pole plate in the braking process is protected.
Furthermore, at least one anti-suction skid friction block is arranged on the top of the inner side polar plate and the top of the outer side polar plate corresponding to the second gap.
Furthermore, the top of the inner side polar plate and the top of the outer side polar plate are both provided with two anti-suction skid friction blocks, and the anti-suction skid friction blocks are arranged on two sides of the hydraulic brake caliper.
Furthermore, a bracket arm connecting piece is arranged on the side wall of the outer side polar plate and used for installing a suspension bracket.
Further, the bracket arm connecting piece is arranged on the side wall of the outer side pole plate far away from the inner side pole plate.
Furthermore, two ends of the gap sensor module are detachably connected with the inner side polar plate and the outer side polar plate respectively.
Furthermore, the tops of the two ends of the polar plate are respectively provided with an anti-suction skid friction block.
Furthermore, the inner polar plate and the outer polar plate are made of Q235A materials.
Further, horizontal skid includes interior horizontal skid and outer horizontal skid, interior horizontal skid and outer horizontal skid symmetry set up the both sides at the outside polar plate, and interior horizontal skid sets up between inboard polar plate, the outside polar plate.
Further, the lateral skid portion is located above the pole plate.
Furthermore, the two adjacent side walls of the inner transverse skid and the outer transverse skid are correspondingly provided with wear-resistant layers, and the wear-resistant layers are located above the polar plates. Through setting up horizontal skid, on the one hand horizontal skid can assist and brake, and on the other hand can also be as the horizontal shelves that end when maglev train passes through the small curve, prevents that the relative track lateral deviation of suspension electromagnet assembly from too big suspension power decline that causes.
Furthermore, the wear-resistant layer is made of sintered alloy. Preferably, the sliding block is fixed on the inner transverse skid or the outer transverse skid by the wear-resistant layer through an inner hexagonal socket head cap screw. Preferably, the inner and outer transverse skids are fixedly connected together by a screw passing through the pole plate.
Further, the aspect ratio of the plate is 2920: 28, preferably the plates are 2920mm long and 28mm wide.
Further, the length-width ratio of the electromagnet coil is 600: 160, preferably, the length of the electromagnet coil is 600mm, and the width of the electromagnet coil is 160 mm.
The utility model has the advantages that: the utility model discloses a suspension electromagnet assembly for well low-speed maglev train all is provided with the protruding portion through the bottom of inboard polar plate, outside polar plate to let the height of protruding portion reduce gradually to both sides from the centre, utilize the protruding portion to carry out the performance to the polar plate and complement, carry out the biggest reinforcing at the great middle part of polar plate trompil, effectively increase the bending resistance of polar plate, improve the security and the stability of suspension frame.
Drawings
Fig. 1 is a schematic structural view of a suspension electromagnet assembly of the present invention;
fig. 2 is a front view of the suspension electromagnet assembly of the present invention;
FIG. 3 is a schematic structural diagram of an inner plate;
in the figure, 1, an inner side polar plate; 2. an outer pole plate; 3. an electromagnet coil; 4. a first transverse skid; 5. a second transverse skid; 6. a hydraulic brake caliper; 7. a gap sensor module; 8. a bracket arm connecting piece; 9. a first gap; 10. a second gap; 11. a third gap; 12. a protrusion; 13. the anti-suction skid friction block; 14. an inner transverse skid; 15. an outer transverse skid; 16. a wear layer; 17. brake lever.
Detailed Description
The technical solution of the present invention is described in further detail below with reference to the accompanying drawings, but the scope of the present invention is not limited to the following description.
As shown in fig. 1 to 3, a suspension electromagnet assembly for a medium-low speed maglev train comprises an inner side pole plate 1, an outer side pole plate 2, four electromagnet coils 3, a hydraulic brake caliper 6, a first transverse skid 4, a second transverse skid 5 and two gap sensor modules 7, wherein the four electromagnet coils 3 are sequentially and uniformly arranged between the inner side pole plate 1 and the outer side pole plate 2 along the length direction of the pole plates, a first gap 9, a second gap 10 and a third gap 11 are sequentially arranged between the electromagnet coils 3, the first transverse skid 4 is arranged on the outer side pole plate 2 corresponding to the first gap 9, the hydraulic brake caliper 6 is arranged corresponding to the second gap 10, the hydraulic brake caliper 6 is connected with the inner side pole plate 1 and the outer side pole plate 2, the second transverse skid pole plate 5 is arranged on the outer side pole plate 2 corresponding to the third gap 11, the gap sensor modules 7 are respectively arranged at two ends of the pole plates, the gap sensor module 7 is used for detecting a suspension gap, the bottom of the inner side polar plate 1 and the bottom of the outer side polar plate 2 are both provided with a protruding part 12, and the height of the protruding part 12 is gradually reduced from the middle to two sides. In the actual use process, because the electromagnet coil 3, the hydraulic brake caliper 6, the first transverse skid 4 and the second transverse skid 5 are required to be fixedly installed on the pole plate, installation holes for installing the electromagnet coil 3 and the hydraulic brake caliper 6 are formed on the inner pole plate 1 and the outer pole plate 2, meanwhile, installation holes for installing the first transverse skid 4 and the second transverse skid 5 are also formed on the outer pole plate 2, and the installation holes can reduce the bending resistance of the pole plate and influence the safety performance of the suspension bracket, in order to solve the technical problem, the bottom of the inner pole plate 1 and the bottom of the outer pole plate 2 are both provided with the protruding parts 12, the height of the protruding parts 12 is gradually reduced from the middle to two sides, the performance of the pole plate is complemented by the protruding parts 12, the maximum strengthening is carried out in the middle part with a larger hole of the pole plate, and the bending resistance of the pole plate is effectively increased, the safety and the stability of the suspension frame are improved.
In particular, said hydraulic brake caliper 6 is connected to the first or second transverse skid 4, 5 by means of a brake lever 17. Preferably, in the direction of travel of the train, said hydraulic brake caliper 6 is connected to the rear transverse skid by means of a brake lever 17, when the train needs to be braked by the hydraulic brake caliper 6, the hydraulic brake caliper 6 is started to work, the rail is clamped by the caliper of the hydraulic brake caliper 6, and by increasing the friction force between the suspension frame and the rail, further carrying out deceleration braking on the train, simultaneously, the friction force can drive the hydraulic brake caliper 6 to move forwards, in order to ensure the safe use of the hydraulic brake caliper 6, by connecting the hydraulic brake caliper 6 with the rear transverse skid, the rear transverse skid applies pulling force to the hydraulic brake caliper 6 through the brake rod 17 to prevent the hydraulic brake caliper 6 from moving forwards, so as to protect the hydraulic brake caliper 6 to stably and safely clamp the rail for braking, meanwhile, the influence of the friction force on the pole plate is further dispersed, and the use safety of the pole plate in the braking process is protected.
Specifically, at least one anti-suction skid friction block 13 is respectively arranged at the top of the inner side polar plate 1 and the top of the outer side polar plate 2 corresponding to the second gap 10.
Specifically, two anti-suction skid friction blocks 13 are arranged on the top of the inner side polar plate 1 and the top of the outer side polar plate 2, and the anti-suction skid friction blocks 13 are arranged on two sides of the hydraulic brake caliper 6.
Specifically, a bracket arm connecting piece 8 is arranged on the side wall of the outer side polar plate 2, and the bracket arm connecting piece 8 is used for installing a suspension bracket arm.
Specifically, the bracket arm connecting piece 8 is arranged on the side wall of the outer pole plate 2 far away from the inner pole plate 1.
Specifically, two ends of the gap sensor module 7 are detachably connected with the inner side pole plate 1 and the outer side pole plate 2 respectively.
Specifically, the tops of the two ends of the polar plate are respectively provided with an anti-dead-suction skid friction block 13.
Specifically, the inner plate 1 and the outer plate 2 are made of Q235A.
Specifically, horizontal skid includes interior horizontal skid 14 and outer horizontal skid 15, interior horizontal skid 14 and outer horizontal skid 15 symmetry set up in the both sides of outside polar plate 2, and interior horizontal skid 14 sets up between inboard polar plate 1, outside polar plate 2.
Specifically, the lateral skid portion is located above the pole plate.
Specifically, the two adjacent side walls of the inner transverse skid 14 and the outer transverse skid 15 are correspondingly provided with a wear-resistant layer 16, and the wear-resistant layer 16 is located above the pole plate. Through setting up horizontal skid, on the one hand horizontal skid can assist and brake, and on the other hand can also be as the horizontal shelves that end when maglev train passes through the small curve, prevents that the relative track lateral deviation of suspension electromagnet assembly from too big suspension power decline that causes.
Specifically, the wear-resistant layer 16 is made of a sintered alloy material. Preferably, the wear layer 16 fixes the slider to the inner or outer transverse skid 14, 15 by means of a socket head cap screw. Preferably, the inner and outer transverse skids 14, 15 are fixedly connected together by screws extending through the plates.
Specifically, the aspect ratio of the plate is 2920: 28, preferably the plates are 2920mm long and 28mm wide.
Specifically, the aspect ratio of the electromagnet coil 3 is 600: 160, preferably, the length of the electromagnet coil 3 is 600mm, and the width of the electromagnet coil 3 is 160 mm. Preferably, the electromagnet coil 3 internally comprises an iron core and a coil, wherein the iron core is made of a Q235B ferromagnetic material, the coil is improved by adopting a high-purity capacitor aluminum foil (0.3 × 73mm) and an H-grade insulating film (0.025 × 75mm), the coil adopts double windings, the number of turns is (160 × 2), the working current of the suspension electromagnet is 30-45A, and the rated current is about 35A; the outer part of the electromagnet coil 3 adopts a resin material as an encapsulation layer.
When the electromagnetic suspension device is used, the suspension electromagnet is electrified, current flows through the coil to generate induction intensity in the electromagnet, and at the moment, the magnetic field intensity exists between the electromagnet and a track polar plate, namely, the electromagnet generates electromagnetic suspension force through interaction with a polar plate on a track; the bottom of the inner polar plate 1 and the bottom of the outer polar plate 2 are both provided with the protruding parts 12, the heights of the protruding parts 12 are gradually reduced from the middle to two sides, the polar plates are complemented by the protruding parts 12, the middle part with larger openings is reinforced to the maximum, the bending resistance of the polar plates is effectively increased, and the safety and the stability of the suspension frame are improved; the improved aluminum foil and the improved insulating material are adopted, so that the coil is ensured not to be burnt out or short-circuited by large current at the moment of electrifying; aiming at the improvement of the length-width ratio of the suspension electromagnet, on one hand, the installation space under the suspension bracket is effectively utilized, on the other hand, the suspension electromagnetic force generated by the suspension electromagnet is improved, and through finite element accounting, the floating suspension force of a single electromagnet is increased, and the requirement can be met by stable suspension; compared with a welding mode, the installation strength is improved through bolt connection, and the safety of the suspension electromagnet under the condition of overheating is ensured; and secondly, the influence of magnetic leakage is effectively reduced by adopting an outer cladding layer of resin under the condition of not influencing the intensity of the suspended magnetic field.
The foregoing is illustrative of the preferred embodiments of the present invention, and it is to be understood that the invention is not limited to the precise forms disclosed herein, and that various other combinations, modifications, and environments may be resorted to, falling within the scope of the invention as defined by the appended claims. But that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention, which is to be limited only by the claims appended hereto.
Claims (10)
1. The suspended electromagnet assembly for the medium-low speed maglev train is characterized by comprising an inner side polar plate, an outer side polar plate, four electromagnet coils, a hydraulic brake caliper, a first transverse skid, a second transverse skid and two gap sensor modules, wherein the four electromagnet coils are sequentially and uniformly arranged between the inner side polar plate and the outer side polar plate along the length direction of the polar plate, a first gap, a second gap and a third gap are sequentially arranged between the electromagnet coils, the first transverse skid is arranged on the outer side polar plate corresponding to the first gap, the hydraulic brake caliper is arranged corresponding to the second gap, the hydraulic brake caliper is connected with the inner side polar plate and the outer side polar plate in an installing mode, the second transverse skid is arranged on the outer side polar plate corresponding to the third gap, the gap sensor modules are respectively arranged at two ends of the polar plate, the gap sensor modules are used for detecting the suspended gap, and the bottom of the inner side polar plate, The bottom of the outside polar plate is provided with a protruding part, and the height of the protruding part is gradually reduced from the middle to two sides.
2. The levitation electromagnet assembly for a medium-low speed maglev train according to claim 1, wherein the hydraulic brake caliper is connected with the first transverse skid or the second transverse skid through a brake lever.
3. The levitation electromagnet assembly for a medium-low speed maglev train according to claim 1, wherein at least one anti-seizing skid friction block is respectively arranged on the top of the inner side polar plate and the top of the outer side polar plate corresponding to the second gap.
4. The levitation electromagnet assembly for a medium-low speed maglev train according to claim 3, wherein two anti-attraction skid friction blocks are arranged on the top of the inner polar plate and the top of the outer polar plate, and the anti-attraction skid friction blocks are arranged on two sides of the hydraulic brake caliper.
5. The levitation electromagnet assembly for a middle-low speed maglev train according to claim 1, wherein a bracket arm connector is arranged on the side wall of the outer pole plate, and the bracket arm connector is used for mounting a suspension bracket arm.
6. A levitating electromagnet assembly according to claim 5, wherein the trailing arm connecting member is disposed on the outer pole plate side wall away from the inner pole plate.
7. The levitation electromagnet assembly for a middle-low speed magnetic-levitation train according to claim 1, wherein two ends of the gap sensor module are detachably connected with the inner side polar plate and the outer side polar plate respectively.
8. The suspended electromagnet assembly for medium and low speed magnetic-levitation trains as recited in claim 1, wherein the tops of both ends of the pole plate are respectively provided with anti-deadly-absorption skid friction blocks.
9. The levitation electromagnet assembly for a middle-low speed magnetic levitation train as recited in claim 1, wherein said inner polar plate and said outer polar plate are Q235A.
10. The levitation electromagnet assembly for a medium-low speed maglev train of claim 1, wherein the transverse skids comprise an inner transverse skid and an outer transverse skid, the inner transverse skid and the outer transverse skid are symmetrically arranged on two sides of the outer pole plate, and the inner transverse skid is arranged between the inner pole plate and the outer pole plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022559924.9U CN213424756U (en) | 2020-11-06 | 2020-11-06 | Suspension electromagnet assembly for medium-low speed maglev train |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022559924.9U CN213424756U (en) | 2020-11-06 | 2020-11-06 | Suspension electromagnet assembly for medium-low speed maglev train |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213424756U true CN213424756U (en) | 2021-06-11 |
Family
ID=76250654
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022559924.9U Active CN213424756U (en) | 2020-11-06 | 2020-11-06 | Suspension electromagnet assembly for medium-low speed maglev train |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213424756U (en) |
-
2020
- 2020-11-06 CN CN202022559924.9U patent/CN213424756U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109056431B (en) | Suspension type permanent magnetism magnetic levitation track traffic machinery structure | |
| US4793263A (en) | Integrated linear synchronous unipolar motor with controlled permanent magnet bias | |
| CN108706013B (en) | Pipeline type magnetic suspension train | |
| CN109795334B (en) | Embedded magnetic suspension traffic track system, suspension frame system, magnetic suspension vehicle and magnetic suspension system | |
| CN104029686A (en) | Track component for maglev train | |
| WO2023241361A1 (en) | Permanent magnet electrodynamic suspension system and guiding method therefor | |
| CN105292134A (en) | Directly-driven straddling-type gearless single-rail bogie | |
| CN102149588A (en) | Eddy current rail brake | |
| CN109795332B (en) | Suspension type magnetic suspension traffic track system, suspension frame system, magnetic suspension vehicle and magnetic suspension system | |
| JP5322479B2 (en) | Normal conducting suction type magnetic levitation vehicle | |
| CN105083029A (en) | Alternating-current excitation rail eddy-current brake and braking method thereof | |
| CN203126559U (en) | Hanging frame foundation supporting module of mid-low speed magnetic levitation vehicle | |
| CN103042947A (en) | Levitation chassis base supporting module of medium and low speed maglev vehicles | |
| CN109795333B (en) | Suspension type magnetic suspension traffic track system, suspension frame system, magnetic suspension vehicle and magnetic suspension system | |
| CN213424756U (en) | Suspension electromagnet assembly for medium-low speed maglev train | |
| CN205292323U (en) | Electromagnetism train | |
| Sharma et al. | Magnetically levitated vehicles: suspension, propulsion and guidance | |
| CN207758607U (en) | A kind of magnetic suspension train head electromagnet | |
| CN206416877U (en) | A kind of novel magnetically levitated rail system | |
| CN210162074U (en) | Intelligent direct-drive straddle type air bus | |
| CN210101624U (en) | Tunnel type medium-low speed magnetic levitation transportation system | |
| CN209776183U (en) | Magnetic suspension logistics vehicle applied to underground pipe gallery logistics system | |
| CN201435284Y (en) | Guide electromagnet device of high-speed maglev | |
| CN114293415B (en) | Permanent magnet magnetic levitation track system for improving vehicle running performance and synchronous linear motor | |
| CN114954026A (en) | Suspension type permanent magnet electric maglev train system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |