CN112208636A - Multi-axle trailer capable of steering independently - Google Patents
Multi-axle trailer capable of steering independently Download PDFInfo
- Publication number
- CN112208636A CN112208636A CN202011142403.1A CN202011142403A CN112208636A CN 112208636 A CN112208636 A CN 112208636A CN 202011142403 A CN202011142403 A CN 202011142403A CN 112208636 A CN112208636 A CN 112208636A
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- steering
- frame
- rod
- axle
- suspension
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- 239000000725 suspension Substances 0.000 claims abstract description 49
- 244000261422 Lysimachia clethroides Species 0.000 claims description 9
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000005540 biological transmission Effects 0.000 abstract description 2
- 238000005452 bending Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D13/00—Steering specially adapted for trailers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G13/00—Resilient suspensions characterised by arrangement, location or type of vibration dampers
- B60G13/02—Resilient suspensions characterised by arrangement, location or type of vibration dampers having dampers dissipating energy, e.g. frictionally
- B60G13/06—Resilient suspensions characterised by arrangement, location or type of vibration dampers having dampers dissipating energy, e.g. frictionally of fluid type
- B60G13/08—Resilient suspensions characterised by arrangement, location or type of vibration dampers having dampers dissipating energy, e.g. frictionally of fluid type hydraulic
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D12/00—Steering specially adapted for vehicles operating in tandem or having pivotally connected frames
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D21/00—Understructures, i.e. chassis frame on which a vehicle body may be mounted
- B62D21/18—Understructures, i.e. chassis frame on which a vehicle body may be mounted characterised by the vehicle type and not provided for in groups B62D21/02 - B62D21/17
- B62D21/20—Understructures, i.e. chassis frame on which a vehicle body may be mounted characterised by the vehicle type and not provided for in groups B62D21/02 - B62D21/17 trailer type, i.e. a frame specifically constructed for use in a non-powered vehicle
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
- B62D5/062—Details, component parts
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D53/00—Tractor-trailer combinations; Road trains
- B62D53/04—Tractor-trailer combinations; Road trains comprising a vehicle carrying an essential part of the other vehicle's load by having supporting means for the front or rear part of the other vehicle
- B62D53/06—Semi-trailers
- B62D53/061—Semi-trailers of flat bed or low loader type or fitted with swan necks
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D7/00—Steering linkage; Stub axles or their mountings
- B62D7/20—Links, e.g. track rods
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Vehicle Body Suspensions (AREA)
- Steering-Linkage Mechanisms And Four-Wheel Steering (AREA)
Abstract
The invention discloses a multi-axle trailer capable of steering independently, which comprises a frame, wheels, a suspension system, a steering system, a braking system and an axle assembly, wherein the wheels are arranged on the frame; the frame comprises a front frame and at least one rear frame; the front frame is hinged with the rear frame through a joint; the steering system comprises a bogie, a steering arm, a tie rod, a longitudinal pull rod, a pull rod fixing frame, a double-rod oil cylinder and a steering hydraulic system; the longitudinal pull rod is an integrated rod body and/or a split type rod body. The invention has the beneficial effects that: through the split type frame that preceding frame and a plurality of back frame are constituteed, can evenly set up the wheel and guarantee the even of load transmission. The longitudinal pull rod of the steering system is provided with the split type rod body and the double-rod oil cylinders, and the telescopic cooperation of the adjacent double-rod oil cylinders can drive a certain single steering arm to rotate, so that the steering of a single group of wheels corresponding to the steering arm is realized, and the turning radius is reduced.
Description
Technical Field
The invention relates to the technical field of trailers, in particular to a multi-axle trailer capable of steering independently.
Background
The front part of the existing common low flat trailer is connected with a tractor through a gooseneck, the tractor is mainly used for dragging and steering during steering, the turning radius is large, and especially when the length of the trailer exceeds 25 m, the roads of villages or villages and towns are usually narrow, and the trailer can not smoothly transport goods. Taking the transportation goods as an example of a prefabricated bent cap, the existing prefabricated bent cap usually weighs about 217 tons, is 25.2 meters wide and 3.5 meters high, has high requirements on transportation vehicles and transportation roads, and a common transportation trailer cannot uniformly transfer loads to the road surface due to the small number of wheels, so that the structure of the road surface is easily damaged. In addition, for the road surface of a special path, such as an S-shaped road surface with small bending radius and irregular bending, part of wheel sets are required to be capable of steering in a specific direction independently, the steering direction of the existing trailer wheel sets is unified synchronous steering, and the overall steering radius of the trailer is still large. Therefore, there is a need for a trailer with uniform load transfer and a small turning radius for transporting cargo of a large single weight and size similar to prefabricated capping beams.
Disclosure of Invention
The invention aims to solve the problems that the turning radius of the existing trailer is small, the load transfer is not uniform, and the wheel set can not be steered independently, and provides an independently steerable multi-axle trailer which comprises a frame, wheels, a suspension system, a steering system, a braking system and an axle assembly; the frame comprises a front frame and at least one rear frame; the front frame is hinged with the rear frame through an adapter; the two ends of the axle assembly are respectively connected with the frame through the suspension system; the braking system and the wheels are arranged at two ends of the axle assembly;
the steering system comprises a bogie, a steering arm, a tie rod, a longitudinal pull rod, a pull rod fixing frame, a double-rod oil cylinder and a steering hydraulic system; the bogie is arranged at the front end and the rear end of the frame; a plurality of steering arms are arranged between the steering frames at intervals along the length direction of the frame; the bogie and the steering arm are connected through the longitudinal pull rod; the two sides of the steering arm are provided with the tie rods, and the other ends of the tie rods are connected with the end parts of tie rod fixing frames arranged on the suspension system; the longitudinal pull rod is an integrated rod body and/or a split rod body; the split type rod body comprises at least two sub-rod bodies keeping a distance; a double-rod oil cylinder is connected between the two sub-rod bodies; and an oil inlet and an oil outlet of the double-rod oil cylinder are respectively provided with an oil pipe and an electromagnetic valve which are communicated with the steering hydraulic system.
Furthermore, all the longitudinal pull rods of the steering system on the front frame are the integrated rod body; and the longitudinal pull rods of the steering system on the rear frame are all split rod bodies.
Furthermore, two opposite sides of the adapter are respectively provided with one longitudinal pull rod.
Further, the double-rod oil cylinder comprises two telescopic cylinder systems which are mutually independent in telescopic mode; the telescopic cylinder system comprises a piston rod, an oil inlet, an oil outlet and the electromagnetic valves, wherein the piston rod, the oil inlet and the oil outlet are communicated with and matched with the steering hydraulic system, and the electromagnetic valves are arranged on the oil inlet and the oil outlet.
Further, the steering hydraulic system comprises an oil tank, an oil pump and an electric control system which are communicated with each other; and the electric control system is electrically or wirelessly connected with the electromagnetic valve.
Further, the electric control system comprises a remote controller wirelessly connected with the electromagnetic valve.
Further, the suspension system comprises a suspension bracket, a lifting oil cylinder and a suspension slewing bearing; the upper end of the suspension bracket is connected with the frame through the suspension slewing bearing; the lower end of the suspension bracket is connected with the axle assembly; the middle of the suspension bracket is provided with a hinged shaft, and two ends of the lifting oil cylinder are respectively hinged to the suspension bracket at two ends of the hinged shaft.
Further, the axle assembly comprises an axle and steering axles arranged at two ends of the axle; the end part of the steering axle is connected with the suspension bracket; the brake system comprises a brake, and the brake is arranged at the end part of the steering axle and connected with the suspension bracket.
Further, the frame comprises a main beam, a secondary beam, a cross beam and an inclined support; the main beam and the auxiliary beam are welded to form a box-type structural frame; two ends of the cross beam are respectively connected with the main beam and the auxiliary beam; the joint of the main beam and the auxiliary beam is also provided with an inclined support; the suspension slewing bearing is connected with the secondary beam.
Further, the multi-axle trailer also comprises a head and a power lifting gooseneck; the front frame is connected with the vehicle head through the power lifting gooseneck; and the adjacent rear frames are hinged through the adapter.
The invention has the beneficial effects that: through the split type frame that preceding frame and a plurality of back frame are constituteed, can evenly set up the wheel and guarantee the even of load transmission, can reduce turning radius to a certain extent simultaneously. The longitudinal pull rod of the steering system is arranged into the split type rod body and the double-rod oil cylinders, and the telescopic cooperation of the adjacent double-rod oil cylinders can drive a single steering arm to rotate, so that the steering of a single group of wheels corresponding to the steering arm is realized, the turning radius can be further reduced, the passing rate of the trailer on a complex road shape is improved, and the device is very suitable for transporting cargos with large single weight and large size similar to a prefabricated capping beam.
Drawings
Fig. 1 is a front view structural schematic diagram of the independent steering multi-axle trailer.
Fig. 2 is a front view of the trailer of fig. 1 with the front and powered raising and lowering gooseneck removed.
Fig. 3 is a top view partially schematic view of the front frame in fig. 2.
Fig. 4 is a top partial structural view of the joint of the front frame and the rear frame in fig. 2.
Fig. 5 is a front view of the suspension system of fig. 4.
In the figure, a vehicle head 1; the gooseneck is lifted by power 2; a front frame 3; a rear frame 4; an adapter 5; a wheel 6; a suspension system 7; the suspension device comprises a suspension bracket 7.1, a lifting oil cylinder 7.2, a suspension slewing bearing 7.3, an axle assembly 8, a braking system 9, a bogie 10, a steering arm 11, a tie rod 12, a longitudinal tie rod 13, a tie rod fixing frame 14, a double-rod oil cylinder 15 and an electromagnetic valve 16.
Detailed Description
The invention is described in further detail below with reference to the figures and specific embodiments.
The multi-axle trailer capable of steering independently as shown in fig. 1-5 comprises a trailer head 1, a power lifting gooseneck 2, a frame, wheels 6, a suspension system 7, a steering system, a braking system 9 and an axle assembly 8.
The frame includes a front frame 3 and at least one rear frame 4, and only one rear frame 4 is illustrated in this embodiment, but actually, there may be two or three rear frames 4, and the length of the rear frame 4 may be further shortened with respect to the rear frame 4 of this example. The front frame 3 is hinged with the rear frame 4 through a joint 5; two ends of the axle assembly 8 are respectively connected with the frame through a suspension system 7; the braking system 9 and the wheels 6 are arranged at two ends of the axle assembly 8; the front frame 3 is connected with the vehicle head 1 through a power lifting gooseneck 2; the adjacent rear frames 4 are hinged through a joint 5. The adapter 5 is preferably an adapter bearing.
Referring to fig. 3 and 4, the steering system comprises a bogie 10, a steering arm 11, a tie rod 12, a longitudinal tie rod 13, a tie rod fixing frame 14, a double-rod oil cylinder 15 and a steering hydraulic system; the bogie 10 is arranged at the front end and the rear end of the frame; a plurality of steering arms 11 are arranged between the steering frames 10 at intervals along the length direction of the frame; the bogie 10 and the steering arm 11 are connected through a longitudinal pull rod 13; two sides of the steering arm 11 are provided with tie rods 12, and the other end of the tie rod 12 is connected with the end part of a tie rod fixing frame 14 arranged on the suspension system 7; the longitudinal tie rod 13 is an integrated rod body and a split rod body, and the arrangement form of the longitudinal tie rod 13 is different according to different frames, for example, the longitudinal tie rods 13 of the steering system on the front frame 3 in the embodiment are all integrated rod bodies; the longitudinal pull rods 13 of the steering system on the rear frame 4 are all split rod bodies. The split type rod body comprises at least two sub-rod bodies keeping a distance; a double-rod oil cylinder 15 is connected between the two sub-rod bodies; an oil pipe and an electromagnetic valve 16 which are communicated with a steering hydraulic system are arranged at an oil inlet and an oil outlet of the double-rod oil cylinder 15.
Two opposite sides of the adapter 5 are each provided with a longitudinal tie 13. The two trailing arms 13 on the same steering arm 11 are also arranged offset, i.e. at the two opposite ends of the steering arm 11.
The double-rod oil cylinder 15 comprises two telescopic cylinder systems which are mutually independent in telescopic mode; the telescopic cylinder system comprises a piston rod, an oil inlet, an oil outlet and an electromagnetic valve 16, wherein the piston rod is communicated with and matched with the steering hydraulic system, and the electromagnetic valve 16 is arranged on the oil inlet and the oil outlet. The steering hydraulic system comprises an oil tank, an oil pump and an electric control system which are communicated with each other; the electronic control system is electrically or wirelessly connected with the electromagnetic valve 16. The electronic control system may be arranged in the vehicle head 1. The opening and closing of the oil inlet and the oil outlet are controlled by the opening and closing of the electromagnetic valve 16, and the electromagnetic valve 16 receives an opening and closing valve instruction of an electric control system.
Referring to fig. 4, for convenience of control, the telescopic cylinder systems may be provided with corresponding numbers or codes, for example, the numbers of the mutually independent telescopic cylinder systems corresponding to some two adjacent double-rod oil cylinders 15 are A, B, C, D in sequence; when the steering arm 11 between the two double-rod oil cylinders 15 needs to rotate independently, the oil inlets and the oil outlets of the telescopic cylinder systems corresponding to the numbers A and D are kept in dynamic balance, namely, the piston rods of the telescopic cylinder systems corresponding to the numbers A and D are in an immovable state. The piston rods of the telescopic cylinder systems corresponding to numbers B and C are extended or retracted in opposite directions so that only this steering arm 11 rotates, while the other adjacent steering arms 11 do not rotate.
In order to facilitate the steering control of the individual wheels 6 for human-vehicle separation, the electronic control system comprises a remote controller wirelessly connected with the electromagnetic valve 16. The remote controller is convenient for other people except the driver, such as copiers or other accompanying people to specifically and specifically control the corresponding wheels 6 to steer independently according to the positions of the corresponding wheels 6 and the road conditions.
The suspension system 7 comprises a suspension bracket 7.1, a lifting oil cylinder 7.2 and a suspension slewing bearing 7.3; the upper end of the suspension bracket 7.1 is connected with the frame through a suspension slewing bearing 7.3; the lower end of the suspension bracket 7.1 is connected with an axle assembly 8; the middle part of the suspension bracket 7.1 is provided with a hinged shaft, and the two ends of the lifting oil cylinder 7.2 are respectively hinged with the suspension brackets 7.1 at the two ends of the hinged shaft. The axle assembly 8 comprises an axle and steering axles arranged at two ends of the axle; the end part of the steering axle is connected with a suspension bracket 7.1; the brake system 9 comprises a brake which is arranged at the end of the steering axle and connected with the suspension bracket 7.1. The wheels 6 of the trailer of this embodiment are each provided with an independent steering system, suspension system 7 and brake system 9. Can carry out independent steering and braking, and has good stability.
The frame of the embodiment comprises a main beam, a secondary beam, a cross beam and an inclined support; the main beam and the auxiliary beam are welded to form a box-type structural frame; two ends of the cross beam are respectively connected with the main beam and the auxiliary beam; the connection part of the main beam and the auxiliary beam is also provided with an inclined support; the suspension slewing bearing 7.3 is connected with the secondary beam. Of course, the frame may be other steel beam structures.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may be made by those skilled in the art without departing from the principle of the invention.
Claims (10)
1. An independently steerable multi-axle trailer characterized in that: the device comprises a frame, wheels, a suspension system, a steering system, a braking system and an axle assembly; the frame comprises a front frame and at least one rear frame; the front frame is hinged with the rear frame through an adapter; the two ends of the axle assembly are respectively connected with the frame through the suspension system; the braking system and the wheels are arranged at two ends of the axle assembly;
the steering system comprises a bogie, a steering arm, a tie rod, a longitudinal pull rod, a pull rod fixing frame, a double-rod oil cylinder and a steering hydraulic system; the bogie is arranged at the front end and the rear end of the frame; a plurality of steering arms are arranged between the steering frames at intervals along the length direction of the frame; the bogie and the steering arm are connected through the longitudinal pull rod; the two sides of the steering arm are provided with the tie rods, and the other ends of the tie rods are connected with the end parts of tie rod fixing frames arranged on the suspension system; the longitudinal pull rod is an integrated rod body and/or a split rod body; the split type rod body comprises at least two sub-rod bodies keeping a distance; a double-rod oil cylinder is connected between the two sub-rod bodies; and an oil inlet and an oil outlet of the double-rod oil cylinder are respectively provided with an oil pipe and an electromagnetic valve which are communicated with the steering hydraulic system.
2. The independently steerable multi-axle trailer of claim 1, wherein: the longitudinal pull rods of the steering system on the front frame are all the integrated rod bodies; and the longitudinal pull rods of the steering system on the rear frame are all split rod bodies.
3. An independently steerable multi-axle trailer as in claim 2, wherein: two opposite sides of the adapter are respectively provided with one longitudinal pull rod.
4. The independently steerable multi-axle trailer of claim 1, wherein: the double-rod oil cylinder comprises two telescopic cylinder systems which are mutually independent in telescopic mode; the telescopic cylinder system comprises a piston rod, an oil inlet, an oil outlet and the electromagnetic valves, wherein the piston rod, the oil inlet and the oil outlet are communicated with and matched with the steering hydraulic system, and the electromagnetic valves are arranged on the oil inlet and the oil outlet.
5. The independently steerable multi-axle trailer of claim 4, wherein: the steering hydraulic system comprises an oil tank, an oil pump and an electric control system which are communicated with each other; and the electric control system is electrically or wirelessly connected with the electromagnetic valve.
6. An independently steerable multi-axle trailer as in claim 5, wherein: the electric control system comprises a remote controller wirelessly connected with the electromagnetic valve.
7. The independently steerable multi-axle trailer of claim 1, wherein: the suspension system comprises a suspension bracket, a lifting oil cylinder and a suspension slewing bearing; the upper end of the suspension bracket is connected with the frame through the suspension slewing bearing; the lower end of the suspension bracket is connected with the axle assembly; the middle of the suspension bracket is provided with a hinged shaft, and two ends of the lifting oil cylinder are respectively hinged to the suspension bracket at two ends of the hinged shaft.
8. The independently steerable multi-axle trailer of claim 7, wherein: the axle assembly comprises an axle and steering axles arranged at two ends of the axle; the end part of the steering axle is connected with the suspension bracket; the brake system comprises a brake, and the brake is arranged at the end part of the steering axle and connected with the suspension bracket.
9. The independently steerable multi-axle trailer of claim 7, wherein: the frame comprises a main beam, a secondary beam, a cross beam and an inclined support; the main beam and the auxiliary beam are welded to form a box-type structural frame; two ends of the cross beam are respectively connected with the main beam and the auxiliary beam; the joint of the main beam and the auxiliary beam is also provided with an inclined support; the suspension slewing bearing is connected with the secondary beam.
10. The independently steerable multi-axle trailer of claim 1, wherein: the multi-axle trailer also comprises a head and a power lifting gooseneck; the front frame is connected with the vehicle head through the power lifting gooseneck; and the adjacent rear frames are hinged through the adapter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011142403.1A CN112208636A (en) | 2020-10-22 | 2020-10-22 | Multi-axle trailer capable of steering independently |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011142403.1A CN112208636A (en) | 2020-10-22 | 2020-10-22 | Multi-axle trailer capable of steering independently |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112208636A true CN112208636A (en) | 2021-01-12 |
Family
ID=74054960
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011142403.1A Pending CN112208636A (en) | 2020-10-22 | 2020-10-22 | Multi-axle trailer capable of steering independently |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112208636A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113771942A (en) * | 2021-09-27 | 2021-12-10 | 湖南三一中型起重机械有限公司 | Steering control system and working machine |
| CN114802434A (en) * | 2022-03-31 | 2022-07-29 | 湖南三一中型起重机械有限公司 | Steering control method and device, engineering vehicle and storage medium |
-
2020
- 2020-10-22 CN CN202011142403.1A patent/CN112208636A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113771942A (en) * | 2021-09-27 | 2021-12-10 | 湖南三一中型起重机械有限公司 | Steering control system and working machine |
| CN113771942B (en) * | 2021-09-27 | 2022-09-09 | 湖南三一中型起重机械有限公司 | Steering control system and working machine |
| CN114802434A (en) * | 2022-03-31 | 2022-07-29 | 湖南三一中型起重机械有限公司 | Steering control method and device, engineering vehicle and storage medium |
| CN114802434B (en) * | 2022-03-31 | 2023-08-29 | 湖南三一中型起重机械有限公司 | Steering control method and device, engineering vehicle and storage medium |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20210701 Address after: 102601 room 905, 1st floor, building 3, 10 guaxiang Road, Panggezhuang Town, Daxing District, Beijing Applicant after: CHINA STATE RAILWAY INVESTMENT CONSTRUCTION GROUP Co.,Ltd. Applicant after: CHINA STATE CONSTRUCTION ENGINEERING Corp.,Ltd. Address before: 102601 room 905, 1st floor, building 3, 10 guaxiang Road, Panggezhuang Town, Daxing District, Beijing Applicant before: CHINA STATE RAILWAY INVESTMENT CONSTRUCTION GROUP Co.,Ltd. |
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| TA01 | Transfer of patent application right | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20210112 |
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| WD01 | Invention patent application deemed withdrawn after publication |