CN114044016A - Welding bogie for rail engineering vehicle - Google Patents
Welding bogie for rail engineering vehicle Download PDFInfo
- Publication number
- CN114044016A CN114044016A CN202111501389.4A CN202111501389A CN114044016A CN 114044016 A CN114044016 A CN 114044016A CN 202111501389 A CN202111501389 A CN 202111501389A CN 114044016 A CN114044016 A CN 114044016A
- Authority
- CN
- China
- Prior art keywords
- assembly
- seat
- axle box
- traction
- suspension device
- 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.)
- Pending
Links
- 238000003466 welding Methods 0.000 title claims abstract description 18
- 239000000725 suspension Substances 0.000 claims abstract description 46
- 239000006096 absorbing agent Substances 0.000 claims abstract description 27
- 230000035939 shock Effects 0.000 claims abstract description 21
- 230000000712 assembly Effects 0.000 claims abstract description 4
- 238000000429 assembly Methods 0.000 claims abstract description 4
- 238000013016 damping Methods 0.000 claims description 10
- 229910000831 Steel Inorganic materials 0.000 claims description 8
- 239000010959 steel Substances 0.000 claims description 8
- 229910003460 diamond Inorganic materials 0.000 abstract description 4
- 239000010432 diamond Substances 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61F—RAIL VEHICLE SUSPENSIONS, e.g. UNDERFRAMES, BOGIES OR ARRANGEMENTS OF WHEEL AXLES; RAIL VEHICLES FOR USE ON TRACKS OF DIFFERENT WIDTH; PREVENTING DERAILING OF RAIL VEHICLES; WHEEL GUARDS, OBSTRUCTION REMOVERS OR THE LIKE FOR RAIL VEHICLES
- B61F5/00—Constructional details of bogies; Connections between bogies and vehicle underframes; Arrangements or devices for adjusting or allowing self-adjustment of wheel axles or bogies when rounding curves
- B61F5/50—Other details
- B61F5/52—Bogie frames
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61F—RAIL VEHICLE SUSPENSIONS, e.g. UNDERFRAMES, BOGIES OR ARRANGEMENTS OF WHEEL AXLES; RAIL VEHICLES FOR USE ON TRACKS OF DIFFERENT WIDTH; PREVENTING DERAILING OF RAIL VEHICLES; WHEEL GUARDS, OBSTRUCTION REMOVERS OR THE LIKE FOR RAIL VEHICLES
- B61F5/00—Constructional details of bogies; Connections between bogies and vehicle underframes; Arrangements or devices for adjusting or allowing self-adjustment of wheel axles or bogies when rounding curves
- B61F5/02—Arrangements permitting limited transverse relative movements between vehicle underframe or bolster and bogie; Connections between underframes and bogies
- B61F5/22—Guiding of the vehicle underframes with respect to the bogies
- B61F5/24—Means for damping or minimising the canting, skewing, pitching, or plunging movements of the underframes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61F—RAIL VEHICLE SUSPENSIONS, e.g. UNDERFRAMES, BOGIES OR ARRANGEMENTS OF WHEEL AXLES; RAIL VEHICLES FOR USE ON TRACKS OF DIFFERENT WIDTH; PREVENTING DERAILING OF RAIL VEHICLES; WHEEL GUARDS, OBSTRUCTION REMOVERS OR THE LIKE FOR RAIL VEHICLES
- B61F5/00—Constructional details of bogies; Connections between bogies and vehicle underframes; Arrangements or devices for adjusting or allowing self-adjustment of wheel axles or bogies when rounding curves
- B61F5/26—Mounting or securing axle-boxes in vehicle or bogie underframes
- B61F5/30—Axle-boxes mounted for movement under spring control in vehicle or bogie underframes
- B61F5/308—Axle-boxes mounted for movement under spring control in vehicle or bogie underframes incorporating damping devices
Abstract
The invention discloses a welding bogie for a rail engineering vehicle, which comprises a framework assembly, a wheel pair assembly, an axle box suspension device, a secondary suspension device, a brake device and a traction device, wherein the framework assembly is formed by assembling and welding a side beam and a cross beam into an H-shaped structure, the side beam is of a U-shaped structure, a side bearing seat, a transverse shock absorber seat and a vertical shock absorber seat are welded on the side beam, and a rubber pile seat, a traction seat and an anti-jumping seat are welded on the cross beam; the bottom of the framework assembly is provided with a guide frame assembly, and the axle box suspension device is connected to the bottom of the framework assembly; the two ends of the wheel set assembly are supported by the axle box suspension device, and the framework assembly is arranged on the two wheel set assemblies; the secondary suspension device comprises a side bearing, a rubber pile, a transverse hydraulic shock absorber and an anti-jumping rope, and the brake device is a brake shoe integrated brake device which is arranged on the inner side of the bogie wheel and is arranged on a side beam formed by a framework; the traction device is arranged on the traction seat, and the cross beam is connected with the vehicle body. The invention has small dead weight and strong diamond resistance, and improves the stability and safety of vehicle operation.
Description
Technical Field
The invention relates to a bogie of a rail engineering vehicle, which is suitable for a subway tunnel engineering vehicle with a speed grade of 120 km/h.
Background
At present, most of bogies for subway tunnel engineering vehicles are refitted from bogies of passenger cars or common trucks, and the passenger cars belong to vehicles with small load variation, and the bogies are fixed by axle weights, so that the bogie can not adapt to the requirement of large load variation of the engineering vehicles, and the requirement of loading goods on the bogie with small axle weights can not be met; although the common truck bogie meets the requirements of large load capacity change and large axle load, the defects of low running speed, large noise, large abrasion and the like are not suitable for the environmental protection requirement of urban rail transit, so that the bogie for the rail engineering vehicle, which meets the load requirement and the environmental protection requirement of the urban rail transit, is needed to be designed.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a novel welding bogie for a rail engineering vehicle, which aims at overcoming the defects in the prior art, meets the requirements of large load variation, heavy axle, high running speed and low noise of the vehicle, and can be applied to engineering vehicles used in urban subway tunnels.
In order to solve the technical problem, the invention provides a welding bogie for a rail engineering vehicle, which comprises a framework assembly, a wheel pair assembly, an axle box suspension device, a secondary suspension device, a brake device and a traction device, wherein the framework assembly is an H-shaped structure formed by assembling, welding and splicing a side beam and a cross beam, the side beam is of a U-shaped structure, a side bearing seat, a transverse shock absorber seat and a vertical shock absorber seat are welded on the side beam, and a rubber pile seat, a traction seat and an anti-jumping seat are welded on the cross beam; the bottom of the framework assembly is provided with a guide frame assembly, and the axle box suspension device is connected to the bottom of the framework assembly through the guide frame assembly; the two ends of the wheel pair assembly are supported by the axle box suspension devices, and the framework assembly is arranged on the two wheel pair assemblies through the axle box suspension devices; the secondary suspension device comprises a side bearing, a rubber pile, a transverse hydraulic shock absorber and an anti-jumping rope, wherein the brake device is a brake shoe integrated brake device, is arranged on the inner side of a bogie wheel and is arranged on a side beam formed by a framework through a bolt; the traction device is arranged on the traction seat, and the cross beam is connected with the vehicle body through the traction device.
The side bearing is fixed on the side bearing seat through a bolt, the rubber stack is fixed on the rubber stack seat, and the side bearing and the rubber stack share the vertical load of the vehicle body; the transverse hydraulic vibration absorbers are obliquely and symmetrically arranged on two sides of the cross beam, one end of each transverse hydraulic vibration absorber is fixed on the transverse vibration absorber seat, and the other end of each transverse hydraulic vibration absorber is connected with the vehicle body and provides transverse damping and rotary damping; one end of the anti-skipping rope is connected to the anti-skipping seat, and the other end of the anti-skipping rope is connected to the vehicle body.
The wheel pair assembly comprises wheels and an axle, and the wheels are arranged at two ends of the axle; and two ends of the wheel pair assembly are supported by the axle box assembly.
The axle box suspension device comprises an axle box assembly, two sides of the axle box assembly are respectively provided with a steel spring and a positioning bushing, and the axle box suspension device is connected with the positioning guide pillar through the positioning bushing; the axle box suspension device is connected with the guide frame assembly through a steel spring, and a vertical hydraulic shock absorber is arranged between the axle box assembly and the framework assembly.
The rubber stack includes two rubber stack springs.
And the lateral bearing seat is provided with a lateral stop.
The brake device comprises a brake shoe, a brake cylinder and a brake pipeline.
The traction device comprises a traction rod and a traction rod pressing block, and the traction rod pressing block is arranged at one end of the traction rod.
Has the advantages that: the framework of the invention is formed into an H-shaped structure, and has small self weight and strong rhombus resistance; the axle box suspension technology is adopted, so that unsprung mass is greatly reduced, and vertical action force of the wheel rail is reduced; a vertical hydraulic damper is adopted between the axle box and the framework, so that vertical damping can be stably provided, and the vertical dynamic performance of the vehicle is improved; the axle box suspension technology can meet the requirement of 30t of vehicle load; the side beam of the framework is designed into a U-shaped structure, so that the gravity center of the vehicle can be reduced, and the stability and the safety of operation are improved; the basic brake device is a brake shoe integrated brake device, occupies small space and is convenient to arrange; the rubber piles of the secondary suspension device are transversely spaced, so that the vertical load is borne, the rotation rigidity of the bogie relative to the vehicle body is provided, and the stability of the vehicle in operation is improved; the transverse shock absorbers are large in longitudinal distance, transverse shock absorption damping between the vehicle body and the bogie is provided, rotary damping of the bogie relative to the vehicle body is provided, and improvement of the transverse stability and the running stability of the vehicle is facilitated. The invention is suitable for subway tunnels and railway main line engineering vehicles with the maximum axle weight of 21t and the speed grade of 120 km/h.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2a is a schematic front view of the structure of the frame assembly of the present invention;
FIG. 2b is a schematic top view of the structure of the framework assembly of the present invention;
FIG. 3 is a schematic diagram of an axlebox suspension of the present invention;
FIG. 4 is a schematic structural view of a secondary suspension according to the present invention;
FIG. 5 is a schematic structural view of the wheelset assembly of the present invention;
FIG. 6 is a schematic structural view of the braking device of the present invention;
fig. 7 is a schematic structural view of the traction device of the present invention.
In the figure: 1. a framework composition; 2. wheel pair assembly; 3. an axle box suspension; 4. a secondary suspension device; 5. a braking device; 6. a traction device; 7. a side beam; 8. a guide frame; 9. positioning the guide post; 10. a brake guide post; 11. a cross beam; 12. a vertical damper seat; 13. a transverse damper seat; 14. a rubber stacking base; 15. a traction seat; 16. an anti-bouncing seat; 17. a side bearing seat; 18. an axle box; 19. a steel spring; 20. a vertical hydraulic damper; 21. positioning the bushing; 22. a wheel; 23. an axle; 24. brake shoes; 25. a brake cylinder; 26. a brake pipe; 27. a side bearing; 28. rubber piles; 29. a transverse hydraulic damper; 30. rope skipping is prevented; 31. a draw bar; 32. and the draw bar is pressed into a block.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and examples.
As shown in fig. 1-7, the invention provides a welding bogie for a rail engineering vehicle, which comprises a framework assembly 1, a wheel pair assembly 2, an axle box suspension device 3, a secondary suspension device 4, a braking device 5 and a traction device 6, wherein the framework assembly 1 is an H-shaped structure formed by assembling, welding and splicing a side beam 7 and a cross beam 11, the side beam 7 is of a U-shaped structure, the gravity center of the vehicle can be reduced, the operation stability and safety are improved, the framework strength is high, the diamond deformation of the bogie is eliminated, the diamond resistance is strong, and the requirements of strength and rigidity are met; the side beam 7 is welded with a side bearing seat 17, a transverse damper seat 13 and a vertical damper seat 12, and the cross beam 11 is welded with a rubber pile seat 14, a traction seat 15 and an anti-bouncing seat 16; the bottom of the framework assembly 1 is provided with a guide frame assembly 8, and the axle box suspension device 3 is connected to the bottom of the framework assembly 1 through the guide frame assembly 8; the two ends of the wheel pair assembly 2 are supported by the axle box suspension devices 3, and the framework assembly 1 is arranged on the two wheel pair assemblies 2 through the axle box suspension devices 3; the secondary suspension device 4 comprises a side bearing 27, a rubber pile 28, a transverse hydraulic shock absorber 29 and an anti-jump rope 30, the secondary suspension device 4 adopts the configuration of a rubber spring liquid-pressure shock absorber, has light dead weight, no abrasion, small noise and stable performance, and can meet the running requirements of urban rail transit; the brake device 5 is a brake shoe integrated brake device, is arranged on the inner side of a wheel of the bogie and is arranged on a side beam of the framework assembly 1 through a bolt; the traction device 6 is arranged on the traction seat 15, and the cross beam 11 is connected with the vehicle body through the traction device 6.
The side bearing 27 is fixed on the side bearing seat 17 through bolts, the rubber pile 28 is fixed on the rubber pile seat 14, and the side bearing 27 and the rubber pile 28 share the vertical load of the vehicle body; the transverse hydraulic vibration absorbers 29 are obliquely and symmetrically arranged at two sides of the cross beam 11, one end of each transverse hydraulic vibration absorber is fixed on the transverse vibration absorber seat 13, and the other end of each transverse hydraulic vibration absorber is connected with the vehicle body and provides transverse damping and rotary damping; one end of the anti-skipping rope 30 is connected to the anti-skipping seat 16, and the other end is connected to the vehicle body.
The wheel set assembly 2 comprises wheels 22 and an axle 23, and the wheels 22 are arranged at two ends of the axle 23; two ends of the wheel set assembly 2 are supported through the axle box assembly 18, and two ends of the wheel set assembly bear the load of the framework through the axle box suspension device.
The axle box suspension device 3 comprises an axle box assembly 18, two sides of the axle box assembly 18 are respectively provided with a steel spring 19 and a positioning bush 21, and the axle box suspension device 3 is connected with the positioning guide pillar 9 through the positioning bush 21; the axle box suspension device 3 is connected with the guide frame assembly 8 through the steel spring 19, and the vertical hydraulic shock absorber 20 is arranged between the axle box assembly 18 and the framework assembly 1, so that vertical shock absorption damping can be stably provided, and the vertical dynamic performance of the vehicle is improved. The axle box suspension technology is adopted, unsprung mass is greatly reduced, and vertical action force of the wheel rail is reduced.
The rubber stack 28 includes two rubber stack springs.
The side bearing seat 17 is provided with a transverse stop.
The brake device 5 comprises a brake shoe 24, a brake cylinder 25 and a brake pipeline 26, and is small in size and flexible in arrangement.
The traction device 6 comprises a traction rod 31 and a traction rod pressing block 32, and the traction rod pressing block 32 is arranged at one end of the traction rod 31; the traction device 6 can stably transmit longitudinal force, reduce longitudinal impact between a vehicle body and a bogie and reduce noise.
The framework of the invention is formed into an H-shaped structure, and the diamond resistance is strong; the axle box suspension technology is adopted, so that unsprung mass is greatly reduced, vertical action force of wheel rails is reduced, and vertical dynamic performance of the vehicle is improved; the axle box suspension device adopts a mode of adding a steel spring and a positioning column, and can meet the requirements of 21t of maximum axle weight and 120km/h of maximum speed; the secondary suspension device adopts the configuration of a rubber spring liquid pressure damper, and has light dead weight, no abrasion, low noise and stable performance; the secondary suspension device adopts a structure that the rubber pile and the side bearing bear together, and still has higher operation stability without installing the anti-snaking shock absorber; the traction device stably transmits longitudinal force, and has small longitudinal impact and low noise. The invention is suitable for subway tunnel engineering vehicles with maximum axle weight of 21t and speed grade of 120 km/h.
The above-described embodiments of the invention are intended to be illustrative only and are not intended to be limiting, as all changes that come within the scope of or equivalence to the invention are intended to be embraced therein.
Claims (8)
1. The utility model provides a welding bogie for track engineering vehicle which characterized in that: the device comprises a framework assembly (1), a wheel pair assembly (2), an axle box suspension device (3), a secondary suspension device (4), a brake device (5) and a traction device (6), wherein the framework assembly (1) is of an H-shaped structure formed by assembling, welding and splicing a side beam (7) and a cross beam (11), the side beam (7) is of a U-shaped structure, a side bearing seat (17), a transverse shock absorber seat (13) and a vertical shock absorber seat (12) are welded on the side beam (7), and a rubber pile seat (14), a traction seat (15) and an anti-jumping seat (16) are welded on the cross beam (11); the bottom of the framework assembly (1) is provided with a guide frame assembly (8), and the axle box suspension device (3) is connected to the bottom of the framework assembly (1) through the guide frame assembly (8); two ends of the wheel pair assembly (2) are supported through the axle box suspension devices (3), and the framework assembly (1) is arranged on the two wheel pair assemblies (2) through the axle box suspension devices (3); the secondary suspension device (4) comprises a side bearing (27), a rubber pile (28), a transverse hydraulic damper (29) and an anti-skipping rope (30), and the brake device (5) is a brake shoe integrated brake device, is arranged on the inner side of a bogie wheel and is arranged on a side beam of the framework assembly (1) through a bolt; the traction device (6) is arranged on the traction seat (15), and the cross beam (11) is connected with the vehicle body through the traction device (6).
2. The welding bogie for railway machineshop car according to claim 1, wherein: the side bearing (27) is fixed on the side bearing seat (17) through bolts, the rubber stack (28) is fixed on the rubber stack seat (14), and the side bearing (27) and the rubber stack (28) share the vertical load of the vehicle body; the transverse hydraulic shock absorbers (29) are obliquely and symmetrically arranged on two sides of the cross beam (11), one end of each transverse hydraulic shock absorber is fixed on the transverse shock absorber seat (13), and the other end of each transverse hydraulic shock absorber is connected with the vehicle body and provides transverse damping and rotary damping; one end of the anti-skipping rope (30) is connected to the anti-skipping seat (16), and the other end of the anti-skipping rope is connected to the vehicle body.
3. The welding bogie for railway machineshop car according to claim 1, wherein: the wheel pair assembly (2) comprises wheels (22) and an axle (23), and the wheels (22) are arranged at two ends of the axle (23); and two ends of the wheel pair assembly (2) are supported by the axle box assembly (18).
4. The welding bogie for railway machineshop car according to claim 1, wherein: the axle box suspension device (3) comprises an axle box assembly (18), two sides of the axle box assembly (18) are respectively provided with a steel spring (19) and a positioning bush (21), and the axle box suspension device (3) is connected with the positioning guide pillar (9) through the positioning bush (21); the axle box suspension device (3) is connected with the guide frame assembly (8) through a steel spring (19), and a vertical hydraulic shock absorber (20) is arranged between the axle box assembly (18) and the framework assembly (1).
5. The welding bogie for railway machineshop car according to claim 1, wherein: the rubber mass (28) comprises two rubber mass springs.
6. The welding bogie for railway machineshop car according to claim 1, wherein: and a transverse stop is arranged on the side bearing seat (17).
7. The welding bogie for railway machineshop car according to claim 1, wherein: the brake device (5) comprises a brake shoe (24), a brake cylinder (25) and a brake line (26).
8. The welding bogie for railway machineshop car according to any one of claims 1 to 7, wherein: the traction device (6) comprises a traction rod (31) and a traction rod pressing block (32), and the traction rod pressing block (32) is arranged at one end of the traction rod (31).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111501389.4A CN114044016A (en) | 2021-12-09 | 2021-12-09 | Welding bogie for rail engineering vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111501389.4A CN114044016A (en) | 2021-12-09 | 2021-12-09 | Welding bogie for rail engineering vehicle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114044016A true CN114044016A (en) | 2022-02-15 |
Family
ID=80212652
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111501389.4A Pending CN114044016A (en) | 2021-12-09 | 2021-12-09 | Welding bogie for rail engineering vehicle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114044016A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114954550A (en) * | 2022-04-22 | 2022-08-30 | 中车资阳机车有限公司 | Self-walking flaw detection vehicle bogie |
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| CN102114851A (en) * | 2011-02-23 | 2011-07-06 | 南车株洲电力机车有限公司 | Rail engineering truck steering frame |
| CN102582645A (en) * | 2012-02-12 | 2012-07-18 | 株洲时代电子技术有限公司 | Electric transmission bogie for track engineering vehicle |
| EP2660120A1 (en) * | 2012-05-03 | 2013-11-06 | Jinan Railway Vehicles Equipment Co., Ltd. | Railway vehicle bogie |
| CN104097655A (en) * | 2014-06-26 | 2014-10-15 | 南车长江车辆有限公司 | Railway express wagon bogie |
| CN105151069A (en) * | 2015-09-29 | 2015-12-16 | 济南轨道交通装备有限责任公司 | Electric driving bogie for subway engineering vehicle |
| WO2017049995A1 (en) * | 2015-09-22 | 2017-03-30 | 中车南京浦镇车辆有限公司 | Direct-drive bogie having axle-mounted permanent magnet electric motor |
| CN106882198A (en) * | 2017-03-22 | 2017-06-23 | 中车太原机车车辆有限公司 | A kind of engineering truck hydraulic-driven meter gauge bogie |
| CN109109896A (en) * | 2018-09-07 | 2019-01-01 | 中车山东机车车辆有限公司 | A kind of subway engineering vehicle novel steering frame |
| CN111891151A (en) * | 2020-08-05 | 2020-11-06 | 中国铁建高新装备股份有限公司 | Electric transmission bogie for track engineering vehicle and track engineering vehicle |
| CN213109319U (en) * | 2020-08-05 | 2021-05-04 | 中国铁建高新装备股份有限公司 | Electric transmission bogie for track engineering vehicle and track engineering vehicle |
| WO2021135198A1 (en) * | 2019-12-31 | 2021-07-08 | 中车长江车辆有限公司 | Bolster-less framed bogie suitable for high-speed freight wagon |
-
2021
- 2021-12-09 CN CN202111501389.4A patent/CN114044016A/en active Pending
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2517641Y (en) * | 2001-12-17 | 2002-10-23 | 齐齐哈尔铁路车辆(集团)有限责任公司 | High speed van steering bogie |
| CN102114851A (en) * | 2011-02-23 | 2011-07-06 | 南车株洲电力机车有限公司 | Rail engineering truck steering frame |
| CN102582645A (en) * | 2012-02-12 | 2012-07-18 | 株洲时代电子技术有限公司 | Electric transmission bogie for track engineering vehicle |
| EP2660120A1 (en) * | 2012-05-03 | 2013-11-06 | Jinan Railway Vehicles Equipment Co., Ltd. | Railway vehicle bogie |
| CN104097655A (en) * | 2014-06-26 | 2014-10-15 | 南车长江车辆有限公司 | Railway express wagon bogie |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114954550A (en) * | 2022-04-22 | 2022-08-30 | 中车资阳机车有限公司 | Self-walking flaw detection vehicle bogie |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
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| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20220215 |