CN209008584U - Compensator and the train for using the compensator - Google Patents
Compensator and the train for using the compensator Download PDFInfo
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- CN209008584U CN209008584U CN201821410725.8U CN201821410725U CN209008584U CN 209008584 U CN209008584 U CN 209008584U CN 201821410725 U CN201821410725 U CN 201821410725U CN 209008584 U CN209008584 U CN 209008584U
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Abstract
The utility model discloses a kind of compensator and the train using the compensator.The compensator includes frame, expansion plate, transmission parts, power source, expansion plate is retractably installed on frame, power source is mounted on frame, transmission parts include at least one set of transmission component, every group of transmission component includes driving wheel C, driving wheel D and transmission belt two, and driving wheel C and driving wheel D are installed in rotation on frame, and two sets of transmission belt on driving wheel C and driving wheel D, expansion plate connects transmission belt two, power source drive driving wheel C rotation.The train includes car body and compensator above-mentioned, and compensator is hinged on the first side wall of car body door side, and car body is connected with frame by air spring, air spring driver framework rotation, to realize putting down and packing up for compensator.This compensator replaces traditional gear drive using belt transmission, and occupied space is smaller, and stretching operation is more stable and low noise.
Description
Technical field
The utility model relates to a kind of compensators of applicable height platform, and using the train of the compensator.
Background technique
The compensator of current existing applicable height platform, the kind of drive are rack pinion, occupied space
Greatly, there is impact when stretching operation, and with biggish noise and vibration.
Utility model content
The purpose of this utility model is: solve the problems in above-mentioned background technique, provide it is a kind of using belt transmissioning mode,
Occupied space is smaller, stretching operation is more stable, the compensator of the applicable height platform of low noise.
In order to achieve the above purposes, the technical solution adopted by the utility model is:
A kind of compensator, including frame, expansion plate, transmission parts, power source, expansion plate are retractably installed at frame
On, power source is mounted on frame, and transmission parts include at least one set of transmission component, and every group of transmission component includes driving wheel C, passes
Driving wheel D and transmission belt two, driving wheel C and driving wheel D are installed in rotation on frame, and two sets of transmission belt in driving wheel C and biography
On driving wheel D, for realizing the power transmitting between driving wheel C and driving wheel D, expansion plate connects transmission belt two, power source drive
Driving wheel C rotation, and then drive expansion plate to do stretching motion by transmission belt two.
Preferably, transmission parts include driving wheel A, driving wheel B, transmission belt one, drive rod and two groups of transmission components, are stretched
Plate includes pedal and the support strip for being located at pedal two sides, the transmission belt two of the two groups of transmission components support strip with pedal two sides respectively
The driving wheel C of connection, the output shaft of driving wheel A connection power source, driving wheel B and two groups of transmission components coaxially may be used by drive rod
Be rotatably mounted on frame, transmission belt is a set of on driving wheel A and driving wheel B, for realizing driving wheel A and driving wheel B it
Between power transmitting, the power of power source is transmitted to driving wheel B through driving wheel A, transmission belt one, and then is transmitted to by drive rod
The driving wheel C of two groups of transmission components, to realize the stretching motion of pedal.
Preferably, frame includes guide housing and the guide rail for being located at guide housing two sides, and the side of guide rail is equipped with guide groove, expansion plate
Two sides are set there are two wheel component one and at least one wheel component two between two wheel components one, and wheel component one includes connection
The wheel shaft one of expansion plate includes anti-jump wheel, two and of wheel shaft with the carrying roller on wheel shaft one, wheel component two is coaxially rotationally covered
Eccentric shaft, anti-jump wheel coaxially rotationally cover on wheel shaft two, wheel shaft two it is parallel with eccentric axis connection and the axis of the two and
It is staggered, eccentric shaft is installed in rotation on expansion plate, and external force is locked after driving eccentric shaft turns to suitable position with secure component
Tightly, to guarantee that anti-jump wheel, carrying roller abut the upper side wall of guide groove, lower wall respectively.
Preferably, distance is more than or equal to 1 millimeter between two axis of wheel shaft and eccentric shaft axis, and is less than or equal to 2 millimeters.
Preferably, eccentric shaft includes coaxially connected shaft part one and shaft part two, shaft part one be located at shaft part two and wheel shaft two it
Between, the diameter of shaft part one is greater than the diameter of shaft part two, and shaft part two penetrates rotatably the mounting hole on expansion plate, secure component packet
Include the nut and axle sleeve positioned at mounting hole axial sides, axle sleeve covers on shaft part two, axle sleeve be divided into coaxially connected first segment and
Second segment, for first segment between second segment and shaft part one, the internal diameter of mounting hole is greater than second segment, and is less than or equal to first
Section, nut are threadedly engaged with shaft part two.
Preferably, guide groove lower wall is equipped with the raised line along the guiding direction of guide rail, and load-bearing wheel side is equipped with and matches with raised line
Annular groove, the cross section of guide groove upper side wall forms the first circular arc, and the axial cross section of anti-jump wheel side forms diameter less than first
Second circular arc of circular arc, the cross section of raised line top surface form third circular arc, the first circular arc, the second circular arc, third circular arc three
The center of circle is respectively positioned on same vertical line.
A kind of train, including car body and compensator above-mentioned, compensator are hinged on the first side wall of car body door side
On, car body is connected with frame by air spring, air spring driver framework rotation, to realize putting down and receiving for compensator
It rises.
Preferably, the first side wall of car body is equipped with vertical lock, when the overturning of compensator forward direction is packed up and close to the first side wall
When, the lock tongue locked vertically is opened, inserts it into the groove one of frame, realizes the vertical locking of compensator；Car body door with
The opposite second sidewall of the first side wall is equipped with horizontal location block, and horizontal location block is lowered into horizontal position in compensator reverse flip
It is prevented to continue to rotate when setting.
Preferably, Horizontal lock is installed on frame, when compensator reverse flip, which is lowered into, abuts horizontal location block, opens
The lock tongue of Horizontal lock inserts it into the groove two of fixed block in second sidewall, realizes the horizontal lock of compensator.
The beneficial effects of the utility model are:
This compensator using belt transmission replace traditional gear drive, occupied space is smaller, stretching operation it is more stable and
Low noise.
Carrying roller, anti-jump wheel are fitted in the guide groove of guide rail, guarantee not will shake when expansion plate stretching motion.Work as frame
On the right side of frame when being located at the anti-jump wheel between two carrying rollers there are two carrying roller and one, anti-jump wheel and the load-bearing close to pedal
Wheel cooperation guarantees that pedal will not rotate down, and anti-jump wheel and the carrying roller cooperation far from pedal guarantee that pedal will not be rotated up,
That is two carrying rollers and an anti-jump wheel cooperation avoid the shake of pedal, guarantee the stabilization that pedal is stretched out and withdrawn.
Raised line guarantees that carrying roller is moved along the guiding direction of guide rail always.First circular arc, the second circular arc, third circular arc three
The center of circle be respectively positioned on same vertical line, to allow support strip and guide rail and a degree of inclination, and at the same time limiting
The shake of horizontal direction.
Detailed description of the invention
The southwestern axis that Fig. 1 shows this compensator surveys perspective view of the explosion；
Fig. 2 shows the vertical view schematic internal views of this compensator；
Fig. 3 shows the schematic top plan view of this compensator；
Fig. 4 shows schematic top plan view when this compensator is mounted on train body；
Schematic front view when Fig. 5 shows carrying roller, anti-jump wheel cooperates with guide rail；
Fig. 6 shows the A-A cross-sectional view of Fig. 5；
Fig. 7 shows the schematic front view of guide rail；
Fig. 8 shows the schematic front view of carrying roller；
Fig. 9 shows the main view schematic cross-sectional view of carrying roller；
Figure 10 shows the right side view of anti-jump wheel；
Figure 11 shows main view schematic cross-sectional view when anti-jump wheel is mounted in support strip；
Figure 12 shows the structural schematic diagram (low station table top) using the train of this compensator when compensator is packed up；
Figure 13 shows the structural schematic diagram (high station table top) using the train of this compensator when compensator is opened.
Appended drawing reference:
1 frame, 101 guide housings, 102 guide rails, 1021 raised lines, 1,022 second circular arcs, 1023 third circular arcs, 103 upper plates,
104 grooves one；
2 expansion plates, 201 pedals, 202 support strips；
3 transmission parts, 301 transmission belts one, 302 transmission belts two, 303 drive rods；
4 wheel components one, 401 carrying rollers, 402 wheel shafts one, 403 annular grooves；
5 wheel components two, 501 anti-jump wheels, 5,011 first circular arcs, 502 wheel shafts two, 503 eccentric shafts, 504 circlip for shaft,
505 axle sleeves；
6 power sources；
7 car bodies, 701 floors, 702 steps, 703 the first side walls, 704 second sidewalls；
8 air springs；
9 vertical locks, 901 lock tongues one；
10 horizontal location blocks；
11 Horizontal locks, 1101 lock tongues two；
12 fixed blocks；
13 low station table tops；
14 high station table tops；
15 turnover hinges.
Specific embodiment
In order to make those skilled in the art more fully understand the technical solution of the utility model, with reference to the accompanying drawing and have
The utility model is described in further detail for body embodiment.
Embodiment one
As shown in Figure 1 and Figure 2, a kind of compensator, including frame 1, expansion plate 2, transmission parts 3, power source 6, pedal 201
It is retractably installed on frame 1, power source 6 is preferably mounted to the motor on frame 1.
Frame 1, including guide housing 101, the guide rail 102 made of aluminum positioned at the left and right sides of guide housing 101, and positioned at leading
To the upper plate 103 trampled for passenger at 101 top of frame.The opening stretched convenient for expansion plate 2 is equipped on front side of guide housing 101, thereon
It is closed with upper plate 103 side.The adjacent side of two guide rails 102 is equipped with the guide groove with carrying roller 401,501 cooperation of anti-jump wheel.
Expansion plate 2 is movably mounted at the inside of guide housing 101, and can stretch out from the opening of 101 front side of guide housing.
When passenger is when high station table top 14 is got on or off the bus, the pedal 201 of expansion plate 2 is stretched out to compensate the gap P of car body 7 Yu high platform, ginseng
Examine Fig. 4.Expansion plate 2 includes pedal 201 and the support strip 202 positioned at 201 left and right sides of pedal, and two support strips 202 are along flexible
The telescopic direction of plate 2 extends back, and the carrying roller 401 cooperated with guide rail 102 and anti-jump wheel 501 are equipped in support strip 202.
Transmission parts 3, including driving wheel A, driving wheel B, transmission belt 1, drive rod 303 and two groups are located at guiding
The transmission component of 101 two sides of frame.Driving wheel A is fixed on the output shaft of power source 6, and driving wheel B is rotationally pacified by support
On guide housing 101, one 301 sets of transmission belt on the outside of driving wheel A and driving wheel B, and realize between the two power transmitting.
Every group of transmission component includes driving wheel C, driving wheel D and transmission belt 2 302, and driving wheel C, driving wheel D pass through support
It is installed in rotation on guide housing 101,2 302 sets of transmission belt on the outside of driving wheel C and driving wheel D, and realize between the two
Power transmitting.When expansion plate 2 does stretching motion, the part connecting on transmission belt 2 302 with support strip 202 is always positioned at transmission
It takes turns between C and driving wheel D.
In order to which the power of power source 6 to be transmitted to the transmission component of two sides, rotatable transmission is set in guide housing 101
The driving wheel C of bar 303, driving wheel B and two sides is coaxially fixed on drive rod 303, with reference to Fig. 2.The power of power source 6 is successively
It is transmitted to expansion plate 2 after driving wheel A, transmission belt 1, driving wheel B, driving wheel C, transmission belt 2 302, is stretched to realize
The flexible and withdrawal of contracting plate 2.
Wheel component 1, the wheel shaft 1 including connection support strip 202, and coaxially rotationally cover in wheel shaft 1
On carrying roller 401.
Wheel component 25 (refers to Figure 11), including anti-jump wheel 501, wheel shaft 2 502 and eccentric shaft 503.Anti-jump wheel 501 is coaxial
It rotationally covers on wheel shaft 2 502, the circlip for shaft 504 for preventing anti-jump wheel 501 to be detached from is arranged on wheel shaft 2 502,
Wheel shaft 2 502 is connected with eccentric shaft 503 and the axis of the two is parallel and is staggered, and eccentric shaft 503 is installed in rotation on bearing
On item 202, external force is locked after driving eccentric shaft 503 to turn to suitable position with secure component, to guarantee anti-jump wheel 501, hold
Roller 401 abuts upper side wall, the lower wall of guide groove respectively.
Eccentric shaft 503 includes coaxially connected shaft part one and shaft part two, shaft part one be located at shaft part two and wheel shaft 2 502 it
Between, the diameter of shaft part one is greater than the diameter of shaft part two, and shaft part two penetrates rotatably the mounting hole on expansion plate 2.
Secure component includes the nut and axle sleeve 505 positioned at mounting hole axial sides, 505 sets of axle sleeve on shaft part two, axis
505 points of set are coaxially connected first segment and second segment, and for first segment between second segment and shaft part one, the internal diameter of mounting hole is big
In second segment, and it is less than or equal to first segment, nut is threadedly engaged with shaft part two, can realize anti-jump wheel 501 by turning nut
Locking and unlocking.
Distance Q is more than or equal to 1 millimeter between 503 axis of 2 502 axis of wheel shaft and eccentric shaft, and is less than or equal to 2 millimeters,
With reference to Figure 11.In the present embodiment, distance is 1.5 millimeters between 503 axis of 2 502 axis of wheel shaft and eccentric shaft, and outer power drive is anti-
It jumps wheel 501 to rotate around eccentric shaft 503, anti-jump wheel 501 can be realized and be adjusted in 3 millimeters of vertical altitude range.
The guide rail 102 in left side, wheel component 1, wheel component 25 and right side guide rail 102, wheel component 1, wheel component 25
It is symmetrical about guide housing 101, (ginseng is described in detail by taking the guide rail 102 on right side, wheel component 1, wheel component 25 as an example below
Examine Fig. 6, Fig. 7, Fig. 8, Figure 11):
Carrying roller 401, anti-jump wheel 501 are two, and two anti-jump wheels 501 are located between two carrying rollers 401.Guide groove
Lower wall is equipped with the raised line 1021 along the guiding direction (length direction) of guide rail 102, and 401 side of carrying roller is equipped with and raised line 1021
Matched annular groove 403, the cross section of the upper side wall of guide groove form the first circular arc 5011, the axial cross section of 501 sides of anti-jump wheel
Second circular arc 1022 of the diameter less than the first circular arc 5011 is formed, the cross section of 1021 top surface of raised line forms third circular arc 1023,
First circular arc 5011, the second circular arc 1022,1023 three of third circular arc the center of circle be respectively positioned on same vertical line.
Because the size of requirement can not be fully achieved in part processing, deviation is always had.To guarantee carrying roller in use process
Wheel shaft 1 is first fixed on branch during installation by the lower wall of 401 abutting guide grooves, the upper side wall of 501 abutting guide groove of anti-jump wheel
It holds on item 202, and eccentric shaft 503 is passed through into the mounting hole in support strip 202, then set carrying roller 401, anti-jump wheel 501
In in guide groove, and guarantee to abut the lower wall of guide groove, and anti-jump wheel 501 be placed in guide groove, then eccentric rotation axis 503 until
Anti-jump wheel 501 abuts the upper side wall of guide groove, is then secured with nuts,
Embodiment two
As shown in Fig. 1, Fig. 4, Figure 12, Figure 13, a kind of train, including the compensator in car body 7 and embodiment one, guide housing
On the first side wall 703 for the door that 101 right ends are mounted on car body 7 by turnover hinge 15, left end by locking 9 or horizontal vertically
Locating piece 10 is separately fixed at vertical position or horizontal position.The hinged car body 7 of 8 right end of air spring is close to the first side wall 703
Floor 701, hinged 101 left end of guide housing in left end.In compensator overturning, air spring 8 can provide auxiliary force and be led with overcoming
Self weight to components such as frames 101.
When passenger (refers to Figure 12) when low station table top 13 is got on or off the bus, turnover hinge 15 and vertical lock 9 fix compensator
In vertical position, pedal 201 is in retracted state at this time, and passenger is got on or off the bus by the step 702 of car body 7.
When passenger is when high station table top 14 is got on or off the bus (refer to Figure 13), turnover hinge 15 and horizontal location block 10 are by compensator
Be fixed on horizontal position, pedal 201 is in stretching state at this time, with compensate car body 7 floor 701 and 14 front end of high station table top it
Between horizontal direction gap P.
Vertical lock 9, is located on the first side wall 703 of car body 7, when the overturning of compensator forward direction is retracted to vertical position, beats
The lock tongue 1 for opening vertical lock 9, inserts it into the groove 1 of frame 1, realizes that the vertical lock 9 of compensator is fixed.
Horizontal location block 10 is located in the second sidewall 704 opposite with the first side wall 703 of car body 7, when compensator reversely turns over
When relaying down toward horizontal position, horizontal location block 10 limits it and continues reverse flip.To make compensator keep steady in horizontal position
It is fixed, Horizontal lock 11 is installed on rear side of guide housing 101, when compensator reverse flip, which is lowered into, abuts horizontal location block 10, is beaten
The lock tongue 2 1101 for opening Horizontal lock 11 inserts it into 7 second sidewall 704 of car body in the groove two of fixed block 12, realizes compensation
The Horizontal lock 11 of device is fixed, sees Fig. 4.
Above embodiment does not constitute the restriction to the technical solution protection scope, any in above embodiment
Spirit and principle within made modifications, equivalent substitutions and improvements etc., should be included in the technical solution protection scope it
It is interior.
Claims (9)
1. a kind of compensator, including frame (1), expansion plate (2), transmission parts (3) and power source (6), expansion plate (2) are scalable
Ground is mounted on frame (1), and power source (6) is mounted on frame (1), it is characterised in that: transmission parts (3) include at least one set
Transmission component, every group of transmission component include driving wheel C, driving wheel D and transmission belt two (302), and driving wheel C and driving wheel D can turn
It is mounted on frame (1) dynamicly, transmission belt two (302) covers on driving wheel C and driving wheel D, for realizing driving wheel C and transmission
The power transmitting between D is taken turns, expansion plate (2) connects transmission belt two (302), and power source (6) drives driving wheel C rotation, Jin Ertong
Crossing transmission belt two (302) drives expansion plate (2) to do stretching motion.
2. compensator according to claim 1, it is characterised in that: the transmission parts (3) include driving wheel A, driving wheel
B, transmission belt one (301), drive rod (303) and two groups of transmission components, expansion plate (2) include pedal (201) and are located at pedal
(201) support strip (202) of two sides, the transmission belt two (302) of the two groups of transmission components support strip with pedal (201) two sides respectively
(202) it connects, the output shaft of driving wheel A connection power source (6), the driving wheel C of driving wheel B and two groups of transmission components passes through transmission
Bar (303) is coaxially installed in rotation on frame (1), and transmission belt one (301) covers on driving wheel A and driving wheel B, for real
Power transmitting between existing driving wheel A and driving wheel B, the power of power source (6) are transmitted to through driving wheel A, transmission belt one (301)
Driving wheel B, and then it is transmitted to the driving wheel C of two groups of transmission components by drive rod (303), to realize stretching for pedal (201)
Contracting movement.
3. compensator according to claim 2, it is characterised in that: the frame (1) includes that guide housing (101) and being located at is led
To the guide rail (102) of frame (101) two sides, the side of guide rail (102) is equipped with guide groove, and expansion plate (2) two sides set that there are two wheel components
One (4) and at least one wheel component two (5) being located between two wheel components one (4), wheel component one (4) include connection expansion plate
(2) wheel shaft one (402) and the carrying roller (401) on wheel shaft one (402) is rotationally coaxially covered, wheel component two (5) includes
Anti-jump wheel (501), wheel shaft two (502) and eccentric shaft (503), anti-jump wheel (501) coaxially rotationally cover in wheel shaft two (502)
On, wheel shaft two (502) is connected with eccentric shaft (503) and the axis of the two is parallel and is staggered, and eccentric shaft (503) is rotationally pacified
On expansion plate (2), external force is locked after driving eccentric shaft (503) to turn to suitable position with secure component, to guarantee anti-
Jump wheel (501), carrying roller (401) abut upper side wall, the lower wall of guide groove respectively.
4. compensator according to claim 3, it is characterised in that: wheel shaft two (502) axis and eccentric shaft (503) axis
Distance is more than or equal to 1 millimeter between line, and is less than or equal to 2 millimeters.
5. compensator according to claim 3, it is characterised in that: the eccentric shaft (503) includes coaxially connected shaft part
One and shaft part two, for shaft part one between shaft part two and wheel shaft two (502), the diameter of shaft part one is greater than the diameter of shaft part two, axis
Section two penetrates rotatably the mounting hole on expansion plate (2), and secure component includes the nut and axis positioned at mounting hole axial sides
It covers (505), axle sleeve (505) covers on shaft part two, and axle sleeve (505) is divided into coaxially connected first segment and second segment, the first section
Between second segment and shaft part one, the internal diameter of mounting hole is greater than second segment, and is less than or equal to first segment, nut and two spiral shell of shaft part
Line cooperation.
6. compensator according to claim 3, it is characterised in that: the guide groove lower wall is equipped with leading along guide rail (102)
Draw the raised line (1021) in direction, carrying roller (401) side is equipped with and raised line (1021) matched annular groove (403), guide groove upside
The cross section of wall forms the first circular arc (5011), and the axial cross section of anti-jump wheel (501) side forms diameter less than the first circular arc
(5011) cross section of the second circular arc (1022), raised line (1021) top surface forms third circular arc (1023), the first circular arc
(5011), the second circular arc (1022), third circular arc (1023) three the center of circle be respectively positioned on same vertical line.
7. a kind of train, including car body (7) and compensator described in any one of claims 1 to 6, it is characterised in that: described
Compensator is hinged on the first side wall (703) of car body (7) door side, and car body (7) and frame (1) pass through air spring
(8) it connects, air spring (8) driver framework (1) rotation, to realize putting down and packing up for compensator.
8. train according to claim 7, it is characterised in that: the first side wall (703) of the car body (7) is equipped with vertical
It locks (9), when the overturning of compensator forward direction is packed up simultaneously close to the first side wall (703), opens the lock tongue one (901) of vertical lock (9), make
In its groove one (104) for being inserted into frame (1), realize that the vertical lock (9) of compensator is fixed；Car body (7) door and the first side wall
(703) opposite second sidewall (704) is equipped with horizontal location block (10), and horizontal location block (10) is put in compensator reverse flip
It is prevented to continue to rotate when down toward horizontal position.
9. train according to claim 8, it is characterised in that: be equipped with Horizontal lock (11) on the frame (1), work as compensation
Device reverse flip is lowered into when abutting horizontal location block (10), is opened the lock tongue two (1101) of Horizontal lock (11), is inserted it into the
On two side walls (704) in the groove two of fixed block (12), realize that the Horizontal lock (11) of compensator is fixed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821410725.8U CN209008584U (en) | 2018-08-29 | 2018-08-29 | Compensator and the train for using the compensator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821410725.8U CN209008584U (en) | 2018-08-29 | 2018-08-29 | Compensator and the train for using the compensator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209008584U true CN209008584U (en) | 2019-06-21 |
Family
ID=66831931
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821410725.8U Active CN209008584U (en) | 2018-08-29 | 2018-08-29 | Compensator and the train for using the compensator |
Country Status (1)
| Country | Link |
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| CN (1) | CN209008584U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112874552A (en) * | 2021-03-01 | 2021-06-01 | 中车青岛四方机车车辆股份有限公司 | Transmission and rail vehicle |
| CN112977515A (en) * | 2021-03-01 | 2021-06-18 | 中车青岛四方机车车辆股份有限公司 | Transmission and rail vehicle |
-
2018
- 2018-08-29 CN CN201821410725.8U patent/CN209008584U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112874552A (en) * | 2021-03-01 | 2021-06-01 | 中车青岛四方机车车辆股份有限公司 | Transmission and rail vehicle |
| CN112977515A (en) * | 2021-03-01 | 2021-06-18 | 中车青岛四方机车车辆股份有限公司 | Transmission and rail vehicle |
| CN112874552B (en) * | 2021-03-01 | 2022-05-27 | 中车青岛四方机车车辆股份有限公司 | Transmission and rail vehicle |
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