CN103680241A - Lifting type railway-bridge motor-train-unit bottom practical training platform - Google Patents
Lifting type railway-bridge motor-train-unit bottom practical training platform Download PDFInfo
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- CN103680241A CN103680241A CN201310710667.6A CN201310710667A CN103680241A CN 103680241 A CN103680241 A CN 103680241A CN 201310710667 A CN201310710667 A CN 201310710667A CN 103680241 A CN103680241 A CN 103680241A
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Abstract
The invention provides a lifting type railway-bridge motor-train-unit bottom practical training platform, and relates to a maintenance platform. The lifting type railway-bridge motor-train-unit bottom practical training platform comprises a railway bridge, lifting systems and pits, the railway bridge comprises a steel rail and a steel structure strut which are used for bearing a motor train unit, the steel structure strut comprises a rectangular frame and a plurality of hollow columns which are fixed to the bottom of the rectangular frame, the top of the rectangular frame is connected with the steel rail through elastic strip fasteners, the bottom of the rectangular frame is connected to the tops of the columns, and the bottoms of the columns stretch into the pits respectively; the stretching end of each lifting system is located in the corresponding column and connected to the top of an inner hole of the corresponding column. According to the lifting type railway-bridge motor-train-unit bottom practical training platform, the steel structure strut can be driven to go up and down through the lifting systems, and therefore lifting of the railway bridge and the motor train unit is achieved, inspection requirements of traveling components of the motor train unit can be met conveniently, and not only can the problem that a teacher cannot train multiple students because an existing underbody maintenance trench space at the bottom of the motor train unit is small be solved, but also production-line maintenance machinists can be trained.
Description
Technical field
The present invention relates to a kind of inspection rack, relate in particular to a kind of track bridge motor train unit bottom maintenance practical traning platform of Liftable type.
Background technology
Be accompanied by the operation of railway the sixth time speed-raising construction project, the construction of Line for Passenger Transportation is postponed and is opened comprehensively, passenger stock will be realized " motor-car ", for the operation that guarantees that motor train unit can be safe, stable, motor train unit uses storehouse stereo operation platform and the track bridge of checking also in succession to come into operation, maintenance storehouse is that motor-car uses most important place, main service work concentrates on here to be carried out, according to motor train unit, use institute's construction project requirement, maintenance storehouse is divided into three layers: ground floor is groove, for detection of train bottom; Bottom is melt pit, establishes trench drain in melt pit, and melt pit is formed by ferroconcrete prop, anchoring joist steel on pillar, and joist steel top integrates with, and forms circuit in maintenance storehouse.The second layer is belly board, can check compartment; The 3rd layer for detection of motor train unit top.
At present, to motor train unit, do " one-level maintenance ", conventionally join 4 motor-car machinists, 2 responsible roofs and compartment, at the bottom of 2 responsible cars, 2 machinist's one the first from left are right, and parts " are touched " past one by one, bend over to come into rail below width and only have 1 meter, motor-car base plate is a narrow trench of 1.65 meters apart from trench bottom of trench, under being drilled in motor-car, work, very " awkward ", so machinist must be slightly curved waist; But the situation of equipment at the bottom of inspection trolley, must face upward head again, like this, just health has been broken into the S of a retrography.Under car, light is darker, is also filling the air one light metal strange taste.
Along with the development of vocational education, by the imitated practice teaching car of true motor-car, be used in the motor car inspection and repair real training in track traffic professional colleges.How designing one and can meet the platform that the maintenance machinist of production line is giveed training to work again in the situation that facilitating practice teaching, is a needs urgent problem.
Summary of the invention
The technical problem to be solved in the present invention is: the track bridge motor train unit bottom maintenance practical traning platform that a kind of Liftable type is provided, to solve the difficulty that trench narrow space teacher at the bottom of the tool car of existing motor train unit bottom cannot be to several student trainings, in the situation that facilitating practice teaching, can meet again the maintenance machinist of production line is giveed training to work.
The technical scheme solving the problems of the technologies described above is: a kind of track bridge motor train unit bottom maintenance practical traning platform of Liftable type, comprise track bridge, jacking system, melt pit, described track bridge comprises for carrying the rail of motor train unit, steel construction pillar, described steel construction pillar comprises rectangular frame, be fixed on the column of many inner hollow of rectangular frame bottom, described rectangular frame top is connected with rail by elastic bar fastener, rectangular frame bottom is connected with the top of many root posts, the bottom of many root posts is stretched into respectively in described melt pit, on each root post, longitudinally have respectively two and be convenient to the groove that jacking system passes, the external part of described jacking system is positioned at column and is connected with the endoporus top of column.
Further technical scheme of the present invention is: described jacking system comprises motor, reductor, shaft coupling, cross commutator, N group Worm gear feed screw elevating mechanism, connecting link, the output shaft of described motor is connected with reductor, the output shaft of reductor is connected with N group Worm gear feed screw elevating mechanism respectively by shaft coupling, cross commutator, in N group Worm gear feed screw elevating mechanism, every group becomes by a plurality of Worm gear feed screw mechanism that is arranged in a line, and each Worm gear feed screw machine is all positioned at column and is connected with the endoporus top of column by external part; In every group of Worm gear feed screw elevating mechanism, between two adjacent Worm gear feed screw machines, by shaft coupling, connecting link, link together, between N group Worm gear feed screw elevating mechanism, by cross commutator, shaft coupling, connecting link, link together, described N >=1.
Further technical scheme more of the present invention is: described shaft coupling comprises two half a couplers, pin, back-up ring, on two described half a couplers, is evenly equipped with a plurality of pin mounting holes, and described back-up ring is installed between these two half a couplers; Described pin one end is arranged on by nut, packing ring on each pin mounting hole of a half a coupler, and the other end of pin is arranged on each pin mounting hole of another half a coupler by elastic ring.
Further technical scheme more of the present invention is: described Worm gear feed screw machine comprises mount pad, casing, worm screw, worm gear, elevating screw, and described mount pad is connected to the bottom of casing, and this mount pad is arranged on the top surface of melt pit by bolt, in casing, be horizontally installed with described worm screw, described worm gear is vertically installed, this worm gear middle part is provided with threaded hole, described elevating screw is installed in this threaded hole, one end of described worm screw laterally passes the groove of column or passes through shaft coupling as power intake, cross commutator is connected with the output shaft of reductor, or pass through shaft coupling, connecting link is connected with the worm screw of previous Worm gear feed screw machine, the groove that the other end of worm screw laterally passes column as clutch end passes through shaft coupling, connecting link is connected with the worm screw of a rear Worm gear feed screw machine, this worm and wheel is meshed, worm gear is meshed with elevating screw, the top of elevating screw is connected with the endoporus top of column by flange.
Further technical scheme of the present invention is: described mount pad bottom is also connected with the protective sleeve for the protection of elevating screw bottom, and this protective sleeve stretches in melt pit.
Further technical scheme of the present invention is: described cross commutator comprises commutator casing, by bearing, is arranged on transverse axis, the longitudinal axis in commutator casing, transverse axis bevel gear is installed on described transverse axis, longitudinal axis bevel gear is installed on the longitudinal axis, this transverse axis bevel gear is meshed with longitudinal axis bevel gear, and described transverse axis, the longitudinal axis are connected with the output shaft of reductor or the worm screw of Worm gear feed screw machine by shaft coupling respectively.
Owing to adopting said structure, the track bridge motor train unit bottom maintenance practical traning platform of the present invention's Liftable type compared with prior art, has following beneficial effect:
1. be convenient to the maintenance training of motor train unit bottom:
Owing to the present invention includes track bridge, jacking system, melt pit, wherein track bridge comprises rail, the steel construction pillar for carrying motor train unit, steel construction pillar comprises rectangular frame, is fixed on the column of many inner hollow of rectangular frame bottom, described rectangular frame top is connected with rail by elastic bar fastener, rectangular frame bottom is connected with the top of many root posts, the bottom of many root posts is stretched into respectively in described melt pit, longitudinally has respectively two and be convenient to the groove that jacking system passes on each root post; The external part of described jacking system is positioned at column and is connected with the endoporus top of column.Therefore the present invention can drive steel construction pillar to rise or decline by jacking system, thereby realizes the lifting of track bridge, motor train unit.Therefore, the present invention is because maintenance practical traning platform adopts Liftable type track bridge structure, thereby convenient to motor train unit traveling position inspection requirements, both can solve the difficulty that trench narrow space teacher at the bottom of the tool car of existing motor train unit bottom cannot be to several student trainings, and in the situation that facilitating practice teaching, can meet again the maintenance machinist of production line is giveed training to work.
2. reliable in structure:
Because the weight of motor train unit, rail is very heavy, they liftings be got up more difficult.Jacking system of the present invention has adopted N group Worm gear feed screw elevating mechanism to carry out synchronization lifting, because each Worm gear feed screw machine of organizing Worm gear feed screw elevating mechanism is comprised of worm reduction gear and elevating screw, its deceleration component is worm drive, utilizing worm screw to drive worm gear to realize slows down, worm gear center is female thread structure, the nut that is equivalent to elevating screw, and elevating screw matches.This Worm gear feed screw machine is that heavy parts is played on a kind of basis, has that compact conformation, volume are little, lightweight, noiselessness, safe ready, many advantages such as use is flexible, reliability is high, power source is extensive, allocation function is many, long service life; The use that combines of a plurality of Worm gear feed screw machines, is controlled exactly and adjusts the height that promotes or advance by certain procedures by motor, can be by track bridge, motor train unit is stable, lifting is got up exactly.Therefore, structure of the present invention is very reliable.
3. low, the simple in structure dexterity of cost:
What the present invention adopted is motor output shaft direct driving technologies, and it is simple in structure, and dexterity has overcome hydraulic pressure, cost pneumatic and electric pushrod simulator is high, heavy, dynamic property is slow shortcoming.
Below, in conjunction with the accompanying drawings and embodiments the technical characterictic of the track bridge motor train unit bottom maintenance practical traning platform of the present invention's Liftable type is further described.
Accompanying drawing explanation
Fig. 1: the structural representation of the track bridge motor train unit bottom maintenance practical traning platform of the present invention's Liftable type;
Fig. 2～Fig. 3: the structural representation of column,
Fig. 2: front view, the A-A cut-open view of Fig. 3: Fig. 2;
The structural representation of jacking system described in Fig. 4: embodiment mono-;
The structural representation of shaft coupling described in Fig. 5～Fig. 6: embodiment mono-:
Fig. 5: front view, the left view of Fig. 6: Fig. 5;
The structural representation of Worm gear feed screw machine described in Fig. 7: embodiment mono-;
Fig. 8: the annexation schematic diagram of the Worm gear feed screw machine of column and jacking system;
The structural representation of cross commutator described in Fig. 9: embodiment mono-;
Figure 10～Figure 12: the working state figure of the track bridge motor train unit bottom maintenance practical traning platform of the present invention's Liftable type:
Figure 10: the present invention is positioned at the side view of minimum duty,
Figure 11: the side view of duty in the middle of the present invention is positioned at,
Figure 12: the present invention is positioned at the side view of high workload state.
In figure, each label is as follows:
1-track bridge, 101-rail, 102-steel construction pillar, 1021-rectangular frame,
1022-column, 10221-groove,
2-jacking system, 201-motor, 202-reductor, 203-shaft coupling,
2031-half a coupler, 2032-pin, 2033-back-up ring, 2034-nut,
2035-packing ring, 2036-elastic ring, 204-cross commutator, 2041-commutator casing,
2042-bearing, 2043-transverse axis, the 2044-longitudinal axis, 2045-transverse axis bevel gear, 2046-longitudinal axis bevel gear,
205-Worm gear feed screw elevating mechanism,
2051-Worm gear feed screw machine, 20511-mount pad, 20512-casing, 20513-worm screw,
20514-worm gear, 20515-elevating screw, 20516-flange, 20517-protective sleeve,
206-connecting link,
3-melt pit, 4-motor train unit.
Embodiment
Embodiment mono-:
Disclosed in Fig. 1 is a kind of track bridge motor train unit bottom maintenance practical traning platform of Liftable type, comprise track bridge 1, jacking system 2, melt pit 3, described track bridge 1 comprises rail 101, the steel construction pillar 102 for carrying motor train unit 4, described rail 101 is 60KG/m rail, the material of this rail 101 is U71,25 meters of standard gauges, and gauge is 1435MM.The column 1022(that described steel construction pillar 102 comprises rectangular frame 1021, be fixed on 6 inner hollow of rectangular frame 1021 bottoms arranges in two separate ranks), described rectangular frame 1021 tops are connected with rail 101 by spring III type fastener, rectangular frame 1021 bottoms are connected with the top of 6 root posts 1022, the longitudinal pitch of each root post be 1.8 meters with interior (1786MM); The bottom of 6 root posts 1022 is stretched into respectively in described melt pit 3, longitudinally has respectively two and be convenient to groove 10221(that jacking system 2 passes referring to Fig. 2～Fig. 3 on each root post 1022); The external part of described jacking system 2 is positioned at column 1022 and is connected with the endoporus top of column 1022.
Above-mentioned jacking system 2 comprises motor 201, reductor 202, shaft coupling 203, cross commutator 204, N group Worm gear feed screw elevating mechanism 205, connecting link 206(is referring to Fig. 4), the output shaft of described motor 201 is connected with reductor 202, the output shaft of reductor 202 is by shaft coupling 203, cross commutator 204 is connected with N group Worm gear feed screw elevating mechanism 205 respectively, in N group Worm gear feed screw elevating mechanism 205, every group forms by 3 the Worm gear feed screw machines 2051 that are arranged in a line, each Worm gear feed screw machine 2051 is all positioned at column 1022 and is connected with the endoporus top of column 1022 by external part, in every group of Worm gear feed screw elevating mechanism 205, between two adjacent Worm gear feed screw machines 2051, by shaft coupling 203, connecting link 206, link together, between N group Worm gear feed screw elevating mechanism 205, by cross commutator 204, shaft coupling 203, connecting link 206, link together, described N=2.
Above-mentioned shaft coupling 203 comprises that two half a couplers 2031, pin 2032, back-up ring 2033(are referring to Fig. 5～Fig. 6), on two described half a couplers 2031, be evenly equipped with a plurality of pin mounting holes, described back-up ring 2033 is installed between these two half a couplers 2031; Described pin 2032 one end are arranged on by nut 2034, packing ring 2035 on each pin mounting hole of a half a coupler, and the other end of pin 2032 is arranged on each pin mounting hole of another half a coupler by elastic ring 2036.
Above-mentioned Worm gear feed screw machine 2051 comprises that mount pad 20511, casing 20512, worm screw 20513, worm gear 20514, elevating screw 20515(are referring to Fig. 7), described mount pad 20511 is connected to the bottom of casing 20512, and this mount pad 20511 is arranged on the top surface of melt pit 3 by bolt, in casing 20512, be horizontally installed with described worm screw 20513, described worm gear 20514 is vertically installed, these worm gear 20514 middle parts are provided with threaded hole, described elevating screw 20515 is installed in this threaded hole, one end of described worm screw 20513 laterally passes the groove of column 1022 or passes through shaft coupling 203 as power intake, cross commutator 204 is connected with the output shaft of reductor 202, or by shaft coupling 203, connecting link 206 is connected with the worm screw 20513 of previous Worm gear feed screw machine 2051, the other end of worm screw 20513 laterally passes the groove of column 1022 by shaft coupling 203 as clutch end, connecting link 206 is connected with the worm screw of a rear Worm gear feed screw machine, this worm screw 20513 is meshed with worm gear 20514, worm gear 20514 is meshed with elevating screw 20515, the top of elevating screw 20515 is connected (referring to Fig. 8) by flange 20516 with the endoporus top of column 1022.Described mount pad 5111 bottoms are also connected with the protective sleeve 20517 for the protection of elevating screw bottom, and this protective sleeve 20517 also stretches in melt pit 3.
Above-mentioned cross commutator 204 comprises commutator casing 2041, by bearing 2042, is arranged on transverse axis 2043 in commutator casing 2041, longitudinal axis 2044(referring to Fig. 9), on described transverse axis 2043, transverse axis bevel gear 2045 is installed, longitudinal axis bevel gear 2046 is installed on the longitudinal axis 2044, this transverse axis bevel gear 2045 is meshed with longitudinal axis bevel gear 2046, and described transverse axis 2043, the longitudinal axis 2044 are connected with the output shaft of reductor or the worm screw of Worm gear feed screw machine 2051 by shaft coupling respectively.
As a kind of conversion of the present embodiment one, it can not be also 2 that the group of described Worm gear feed screw elevating mechanism 205 is counted N, but 1 or 3 or 4, Worm gear feed screw machine 2051 quantity of described every group of Worm gear feed screw elevating mechanism 205 of formation also can not be 3, but 1,2,4,5,67,8 ...
As a kind of conversion of the present embodiment one, the quantity of described column 1022 also can not be 6, but more or less, but should guarantee in each column, at least there is a Worm gear feed screw machine 2051.
principle of work of the present invention is as follows:
Controller is passed to signal on the motor 201 of jacking system 2, the main shaft of motor and reductor 202 join, the output shaft of reductor 202 passes through shaft coupling 203 by power, cross commutator 204 is passed to the worm screw of first Worm gear feed screw machine 2051 of respectively organizing Worm gear feed screw elevating mechanism 205, worm screw is when rotating the lifting of drive elevating screw by driving worm gear, also pass through shaft coupling, connecting link is the worm screw to next Worm gear feed screw machine 2051 by power transmission, so analogize, until pass to the worm screw of last Worm gear feed screw machine 2051, this worm screw also drives worm gear to rotate simultaneously and drives elevating screw lifting, thereby realize the elevating screw lifting simultaneously of each Worm gear feed screw machine 2051, drive also synchronous rising or decline of steel construction pillar 102.
Claims (6)
1. practical traning platform is overhauled in the track bridge motor train unit of Liftable type bottom, it is characterized in that: comprise track bridge (1), jacking system (2), melt pit (3), described track bridge (1) comprises the rail (101) for carrying motor train unit (4), steel construction pillar (102), described steel construction pillar (102) comprises rectangular frame (1021), be fixed on the column (1022) of many inner hollow of rectangular frame (1021) bottom, described rectangular frame (1021) top is connected with rail (101) by elastic bar fastener, rectangular frame (1021) bottom is connected with the top of many root posts (1022), the bottom of many root posts (1022) is stretched into respectively in described melt pit (3), on each root post, longitudinally have respectively two and be convenient to the groove (10221) that jacking system (2) passes, the external part of described jacking system (2) is positioned at column (1022) and is connected with the endoporus top of column (1022).
2. practical traning platform is overhauled in the track bridge motor train unit of Liftable type according to claim 1 bottom, it is characterized in that: described jacking system (2) comprises motor (201), reductor (202), shaft coupling (203), cross commutator (204), N organizes Worm gear feed screw elevating mechanism (205), connecting link (206), the output shaft of described motor (201) is connected with reductor (202), the output shaft of reductor (202) is by shaft coupling (203), cross commutator (204) is connected with N group Worm gear feed screw elevating mechanism (205) respectively, in N group Worm gear feed screw elevating mechanism (205), every group forms by a plurality of Worm gear feed screw machines (2051) that are arranged in a line, each Worm gear feed screw machine (2051) is all positioned at column (1022) and is connected with the endoporus top of column (1022) by external part, in every group of Worm gear feed screw elevating mechanism (205), between two adjacent Worm gear feed screw machines (2051), by shaft coupling (203), connecting link (206), link together, between N group Worm gear feed screw elevating mechanism (205), by cross commutator (204), shaft coupling (203), connecting link (206), link together, described N >=1.
3. practical traning platform is overhauled in the track bridge motor train unit of Liftable type according to claim 2 bottom, it is characterized in that: described shaft coupling (203) comprises two half a couplers (2031), pin (2032), back-up ring (2033), on described two half a couplers (2031), be evenly equipped with a plurality of pin mounting holes, described back-up ring (2033) is installed between these two half a couplers (2031); Described pin (2032) one end is arranged on by nut (2034), packing ring (2035) on each pin mounting hole of a half a coupler, and the other end of pin (2032) is arranged on each pin mounting hole of another half a coupler by elastic ring (2036).
4. practical traning platform is overhauled in the track bridge motor train unit of Liftable type according to claim 2 bottom, it is characterized in that: described Worm gear feed screw machine (2051) comprises mount pad (20511), casing (20512), worm screw (20513), worm gear (20514), elevating screw (20515), described mount pad (20511) is connected to the bottom of casing (20512), and this mount pad (20511) is arranged on the top surface of melt pit (3) by bolt, in casing (20512), be horizontally installed with described worm screw (20513), described worm gear (20514) is vertically installed, this worm gear (20514) middle part is provided with threaded hole, described elevating screw (20515) is installed in this threaded hole, one end of described worm screw (20513) laterally passes the groove of column (1022) or passes through shaft coupling (203) as power intake, cross commutator (204) is connected with the output shaft of reductor (202), or by shaft coupling (203), connecting link (206) is connected with the worm screw (20513) of previous Worm gear feed screw machine (2051), the other end of worm screw (20513) laterally passes the groove of column (1022) by shaft coupling (203) as clutch end, connecting link (206) is connected with the worm screw of a rear Worm gear feed screw machine, this worm screw (20513) is meshed with worm gear (20514), worm gear (20514) is meshed with elevating screw (20515), the top of elevating screw (20515) is connected with the endoporus top of column (1022) by flange (20516).
5. practical traning platform is overhauled in the track bridge motor train unit of Liftable type according to claim 4 bottom; it is characterized in that: described mount pad (5111) bottom is also connected with the protective sleeve (20517) for the protection of elevating screw bottom, and this protective sleeve (20517) stretches in melt pit (3).
6. according to the track bridge motor train unit bottom maintenance practical traning platform of the Liftable type described in claim 1 or 2 or 3 or 4 or 5, it is characterized in that: described cross commutator (204) comprises commutator casing (2041), by bearing (2042), be arranged on the transverse axis (2043) in commutator casing (2041), the longitudinal axis (2044), transverse axis bevel gear (2045) is installed on described transverse axis (2043), longitudinal axis bevel gear (2046) is installed on the longitudinal axis (2044), this transverse axis bevel gear (2045) is meshed with longitudinal axis bevel gear (2046), described transverse axis (2043), the longitudinal axis (2044) is connected with the output shaft of reductor or the worm screw of Worm gear feed screw machine (2051) by shaft coupling respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310710667.6A CN103680241B (en) | 2013-12-19 | 2013-12-19 | Practical traning platform is overhauled bottom the track bridge motor train unit of Liftable type |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310710667.6A CN103680241B (en) | 2013-12-19 | 2013-12-19 | Practical traning platform is overhauled bottom the track bridge motor train unit of Liftable type |
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| Publication Number | Publication Date |
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| CN103680241A true CN103680241A (en) | 2014-03-26 |
| CN103680241B CN103680241B (en) | 2015-10-28 |
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| CN201310710667.6A Expired - Fee Related CN103680241B (en) | 2013-12-19 | 2013-12-19 | Practical traning platform is overhauled bottom the track bridge motor train unit of Liftable type |
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Cited By (4)
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| CN106144952A (en) * | 2016-08-21 | 2016-11-23 | 江滔 | A kind of melt pit for automobile chassis detection |
| CN109903630A (en) * | 2019-04-16 | 2019-06-18 | 重庆公共运输职业学院 | Railway locomotive and travelled by vehicle portion check device |
| CN110666753A (en) * | 2019-10-17 | 2020-01-10 | 安徽瑞铁轨道装备有限公司 | Variable rail lifting device for railway wheel set maintenance platform |
| CN117409631A (en) * | 2023-12-13 | 2024-01-16 | 湖南高铁时代数字化科技有限公司 | Rail transit vehicle structure and overhauling practical training equipment |
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| CN203706477U (en) * | 2013-12-19 | 2014-07-09 | 柳州铁道职业技术学院 | Motor train unit bottom maintenance training platform with lifetable rail bridge |
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| JP2003005621A (en) * | 2001-06-25 | 2003-01-08 | Hitachi Plant Eng & Constr Co Ltd | Device for handling suspended load under simulated practice and training system for handling suspended load |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106144952A (en) * | 2016-08-21 | 2016-11-23 | 江滔 | A kind of melt pit for automobile chassis detection |
| CN109903630A (en) * | 2019-04-16 | 2019-06-18 | 重庆公共运输职业学院 | Railway locomotive and travelled by vehicle portion check device |
| CN110666753A (en) * | 2019-10-17 | 2020-01-10 | 安徽瑞铁轨道装备有限公司 | Variable rail lifting device for railway wheel set maintenance platform |
| CN117409631A (en) * | 2023-12-13 | 2024-01-16 | 湖南高铁时代数字化科技有限公司 | Rail transit vehicle structure and overhauling practical training equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103680241B (en) | 2015-10-28 |
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