CN112498403A - Power bogie with single wheel shaft capable of steering - Google Patents
Power bogie with single wheel shaft capable of steering Download PDFInfo
- Publication number
- CN112498403A CN112498403A CN202011469966.1A CN202011469966A CN112498403A CN 112498403 A CN112498403 A CN 112498403A CN 202011469966 A CN202011469966 A CN 202011469966A CN 112498403 A CN112498403 A CN 112498403A
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- Prior art keywords
- wheel
- axle
- mandrel
- connecting rod
- frame
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Classifications
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- 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
Abstract
The invention discloses a power bogie with a single wheel shaft capable of steering, which comprises a lifting unit, a mandrel, a single wheel shaft bogie and a driven bogie center plate, wherein the mandrel is arranged on the lifting unit; the mandrel is fixedly connected with the lifting unit; the single-wheel-shaft bogie is in contact with the lifting unit and is driven by the lifting unit to move in the vertical direction; and the driven steering center plate is rotationally connected with the mandrel and is fixedly connected with the single-wheel-shaft bogie, so that the single-wheel-shaft bogie can rotate around the mandrel. According to the invention, when the lifting unit (capable of selecting a parallelogram mechanism) is used for realizing different lifting/lowering states of the single-axle bogie, the main structure body of the single-axle bogie is always kept in a horizontal state, so that structural support is provided for the passive steering function design of the single-axle power bogie; meanwhile, the power steering frame is designed into a single-axle form, so that the weight and the cost of the device can be effectively reduced.
Description
Technical Field
The invention belongs to the technical field of bogies, and particularly relates to a power bogie with a single steering wheel shaft.
Background
In recent years, the track traffic in China is developed vigorously, subways, urban rails, high-speed rails and railways in western regions are built as fiercely as possible, and the demand for track function vehicles is also increasing. Compared with the traditional rail special function vehicle, the rail dual-purpose vehicle has the greatest advantages of flexibility, long life cycle cost far lower than that of the traditional rail vehicle, and capability of meeting the requirements of modernization, energy conservation, environmental protection and high efficiency.
The single-axle power bogie is applied to a road-rail dual-purpose vehicle, and the conventional single-axle power bogie structure does not have a passive steering function. If the bogie of the combined highway and railway vehicle cannot steer, the driving safety and the driving speed of the whole combined highway and railway vehicle are affected.
As shown in fig. 1 and 2, a rail-mounted suspension system of a fire truck for both rail and road use is disclosed in chinese patent application publication No. CN 102275475A. As shown in fig. 3, chinese patent application publication No. CN106394145A discloses a dual-power steering running gear and a convertible car for highway and railway. It can be seen that:
(1) the single-wheel-shaft bogie has no passive steering function and low running stability;
(2) the double-wheel-shaft bogie structure has complex integral design and heavier weight.
Disclosure of Invention
Aiming at the problems, the invention provides a single-wheel-axle steerable power bogie, which utilizes a parallelogram mechanism to realize that a main frame body of the bogie always keeps a horizontal state when the bogie is lifted/lowered in different states, thereby providing structural support for the passive steering function design of the single-wheel-axle power bogie; meanwhile, the power steering frame is designed into a single-axle form, so that the weight and the cost of the device can be effectively reduced.
In order to achieve the technical purpose and achieve the technical effects, the invention is realized by the following technical scheme:
a single axle steerable power truck comprising:
a lifting unit;
the mandrel is fixedly connected with the lifting unit;
the single-wheel-shaft steering frame is in contact with the lifting unit and is driven by the lifting unit to move in the vertical direction;
and the passive steering center plate is rotationally connected with the mandrel and is fixedly connected with the single-wheel-shaft bogie, so that the single-wheel-shaft bogie can rotate around the mandrel.
Optionally, the lifting unit comprises:
connecting the frame body;
the supporting oil cylinder is connected with the connecting frame body;
one end of the first connecting rod and one end of the second connecting rod are connected with the supporting oil cylinder respectively;
one end of the parallelogram connecting rod is connected with the connecting frame body, the other end of the parallelogram connecting rod is respectively connected with the other ends of the first connecting rod and the second connecting rod, and deflection is carried out under the action of the supporting oil cylinder, the first connecting rod and the second connecting rod;
and the transition frame is hinged with the end part of the parallelogram connecting rod and is used for contacting with the single-wheel-shaft steering frame, and the upper end surface of the transition frame is always kept in a horizontal state in the lifting or lowering process of the lifting unit.
Optionally, the lifting unit further comprises a side supporting wheel, the side supporting wheel is connected with the transition frame and is in contact with the single-wheel-shaft bogie, and when the single-wheel-shaft bogie is steered, the side supporting wheel can roll on the upper surface of the single-wheel-shaft bogie and has a supporting function.
Optionally, the mandrel is fixedly connected to the transition frame.
Optionally, the single axle bogie comprises:
a main frame;
2 axle boxes oppositely arranged and connected with the main framework through a damping element;
the two ends of the wheel shaft are respectively and rotationally connected with the corresponding axle boxes;
the axle box connecting rod is connected with the 2 axle boxes simultaneously;
the output end of the reduction box is connected with the wheel shaft;
the planetary speed reducer is connected with the input end of the reduction gearbox;
the hydraulic motor is connected with the input end of the planetary reducer and is fixed on the axle box through a motor auxiliary supporting seat;
and a joint bearing is connected between the reduction gearbox hanging rod and the lug plate of the reduction gearbox and is fixedly connected with the axle box connecting rod.
Optionally, a shock pad is arranged between the motor auxiliary supporting seat and the axle box.
Optionally, the passive steering core comprises:
the abrasion disc is connected with the main frame, and when the main frame rotates, the abrasion disc and the mandrel form a sliding friction pair together;
the self-lubricating shaft sleeve is sleeved in the central inner hole of the main frame and is in contact with the mandrel to form a rotary friction pair;
the end cover is connected with the mandrel through a fixing bolt;
the thrust bearing is arranged between the end cover and the mandrel to form a rolling friction pair;
the main frame is pressed down on the thrust bearing, and then pressure is transmitted to the lower end of the mandrel through the thrust bearing, the end cover and the fixing bolt.
Optionally, the passive steering center plate further comprises a gap adjusting gasket, the gap adjusting gasket is arranged between the spindle and the end cover, and the thickness of the gap adjusting gasket is adjusted to enable the abrasion plate to be separated from the spindle.
Optionally, the passive steering center plate still includes the skeleton oil blanket, the skeleton oil blanket covers thrust bearing prevents that outside dust and impurity from getting into thrust bearing's rotation seal chamber, the rotation seal chamber by the mandrel constitutes jointly with the end cover.
Optionally, the passive steering center plate further comprises an oil cup, and the oil cup is connected with the rotating seal cavity and used for filling lubricating grease into the rotating seal cavity.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a power bogie with a single wheel shaft capable of steering.A main frame body of the power bogie is always kept in a horizontal state when the power bogie is lifted or put down in different states by utilizing a parallelogram mechanism, so that structural support is provided for the passive steering function design of the power bogie with the single wheel shaft; meanwhile, the power steering frame is designed into a single-axle form, the weight and the cost of the device can be effectively reduced, if the main frame is not in a horizontal state, a passive steering spindle is not perpendicular to the ground, and the running stability of the whole vehicle track is affected.
Drawings
In order that the present disclosure may be more readily and clearly understood, reference is now made to the following detailed description of the present disclosure taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a schematic diagram of a dual-purpose fire truck for rail and road in the prior art;
FIG. 2 is a schematic diagram of a rail-mounted fire truck track-mounted suspension system according to the prior art;
FIG. 3 is a schematic structural view of a dual-power guided traveling device and a convertible car for road and railway in the prior art;
FIG. 4 is a schematic view of a single axle steerable power truck according to one embodiment of the present invention;
FIG. 5 is a second schematic structural view of a single axle steerable power truck in accordance with an embodiment of the present invention;
FIG. 6 is a schematic view of a passive steering center plate according to an embodiment of the present invention;
wherein:
1-1 connecting frame body, 1-2 parallelogram connecting rods, 1-3 supporting oil cylinders, 1-4 first connecting rods, 1-5 transition frames, 1-6 mandrels, 1-7 single-wheel-shaft steering frames, 1-8 side supporting wheels, 2-1 main frame, 2-2 shock absorption elements, 2-3 wheel shafts, 2-4 axle boxes, 2-5 motor auxiliary supporting seats, 2-6 hydraulic motors, 2-7 planetary reducers, 2-8 reduction boxes, 2-9 reduction box connecting rods, 2-10 reduction box hanging rods, 2-11 joint bearings, 3-1 abrasion discs, 3-2 fixing bolts, 3-3 self-lubricating shaft sleeves, 3-4 framework oil seals, 3-5 thrust bearings, 3-6 oil cups, 3-7 gaskets, a bearing, a, 3-8 end covers.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the scope of the invention.
The following detailed description of the principles of the invention is provided in connection with the accompanying drawings.
As shown in fig. 4-6, the present invention provides a single axle steerable power truck comprising:
a lifting unit;
the mandrel 1-6 is fixedly connected with the lifting unit;
the single-wheel-shaft steering frames 1-7 are in contact with the lifting unit and driven by the lifting unit to move in the vertical direction;
and the passive steering center plate is rotationally connected with the spindle 1-6 and is fixedly connected with the single-wheel-shaft bogie 1-7, so that the single-wheel-shaft bogie 1-7 can rotate around the spindle 1-6.
As shown in fig. 4, in an embodiment of the present invention, the lifting unit includes:
a connecting frame body 1-1; in the actual use process, the connecting frame body 1-1 is taken as a part of a power bogie assembling chassis structure or can be assembled on a chassis;
the supporting oil cylinder 1-3 is connected with the connecting frame body 1-1;
the first connecting rod 1-4 and the second connecting rod are oppositely arranged, and one ends of the first connecting rod and the second connecting rod are respectively connected with the supporting oil cylinder 1-3;
one end of a parallelogram connecting rod 1-2 is connected with the connecting frame body 1-1, the other end of the parallelogram connecting rod is respectively connected with the other ends of the first connecting rod 1-4 and the second connecting rod, and deflection is carried out under the action of the supporting oil cylinder 1-3, the first connecting rod 1-4 and the second connecting rod;
and the transition frame 1-5 is hinged with the end part of the parallelogram connecting rod 1-2 and is used for contacting with the single-wheel-shaft steering frame 1-7, and the upper end surface of the transition frame is always kept in a horizontal state in the lifting or lowering process of the lifting unit. The spindles 1-6 are fixedly connected with the transition frames 1-5, for example, by means of bolt connection or the like, so that the single-wheel spindle bogie 1-7 can rotate (i.e., steer) around the spindles 1-6 in a horizontal plane.
The lifting unit further comprises side supporting wheels 1-8, the side supporting wheels 1-8 are connected with the transition frames 1-5 and are in contact with the single-wheel-shaft steering frames 1-7, when the single-wheel-shaft steering frames 1-7 steer, the side supporting wheels can roll on the upper surfaces of the single-wheel-shaft steering frames 1-7, and meanwhile, the supporting effect is achieved.
In one embodiment of the present invention, as shown in fig. 5, the single axle bogie 1-7 comprises:
a main framework 2-1;
2 axle boxes 2-4 oppositely arranged and connected with the main frame 2-1 through a shock absorption element 2-2 (such as an elastic element);
the two ends of the wheel shafts 2-3 are respectively and rotatably connected with the corresponding axle boxes 2-4, so that the wheel shafts 2-3 can rotate relative to the axle boxes 2-4;
axle box connecting rods 2-9, which are connected to 2 axle boxes 2-4 at the same time;
the output end of the reduction box 2-8 is connected with the wheel shaft 2-3;
the planetary speed reducer 2-7 is connected with the input end of the reduction gearbox 2-8;
the hydraulic motor 2-6 is connected with the input end of the planetary reducer 2-7 and is fixed on the axle box 2-4 through a motor auxiliary supporting seat 2-5;
the reduction box hanging rod 2-10 and the lug plate of the reduction box 2-8 are connected with the joint bearings 2-11, the joint bearings 2-11 can compensate deviation caused in the processing and assembling process, and are fixedly connected with the axle box 2-4 connecting rod, the fixed connection can improve the rigidity of the mechanism, and the relative movement dislocation caused by elastic connection is avoided to be larger.
In an embodiment of the present invention, a shock absorbing pad (not shown) is disposed between the motor auxiliary supporting seat 2-5 and the axle box 2-4, so as to compensate for processing and assembling errors and reduce impact between the supporting seat and the axle box 2-4 during movement.
In one embodiment of the present invention, as shown in fig. 6, the passive steering center comprises:
the abrasion disc 3-1 is connected with the main frame 2-1 and forms a sliding friction pair together with the spindle 1-6 when the main frame 2-1 rotates;
a self-lubricating shaft sleeve 3-3, which is sleeved in the central inner hole of the main frame 2-1 and contacts with the mandrel 1-6 to form a rotary friction pair;
the end cover 3-8 is connected with the mandrel 1-6 through a fixing bolt 3-2;
the thrust bearing 3-5 is arranged between the end cover 3-8 and the mandrel 1-6 to form a rolling friction pair;
when the spindle is lifted, the main frame 2-1 presses down on the thrust bearing 3-5, and pressure is transmitted to the lower end of the spindle 1-6 through the thrust bearing 3-5, the end cover 3-8 and the fixing bolt 3-2.
The passive steering center plate also comprises a gap adjusting gasket 3-7, the gap adjusting gasket 3-7 is arranged between the spindle 1-6 and an end cover 3-8, and the abrasion plate 3-1 is separated from the spindle 1-6 by adjusting the thickness of the gap adjusting gasket 3-7.
The passive steering center disk further comprises a framework oil seal 3-4, the thrust bearing 3-5 is covered by the framework oil seal 3-4, outside dust and impurities are prevented from entering a rotating sealing cavity of the thrust bearing 3-5, and the rotating sealing cavity is formed by the mandrel 1-6 and an end cover 3-8 together.
The passive steering center plate also comprises an oil cup 3-6, and the oil cup 3-6 is connected with the rotating seal cavity and used for filling lubricating grease into the rotating seal cavity.
Therefore, when the single-axle steerable power bogie is lowered for supporting, the weight of the spindle 1-6 and above is directly pressed on the abrasion disc 3-1, and the spindle 1-6 and the abrasion disc 3-1 form a sliding friction pair during steering, so that the steering damping is improved, and the stability during turning is facilitated; when the power bogie with the single wheel shaft capable of steering is lifted and retracted, the weight below the spindle 1-6 is pressed down on the thrust bearing 3-5 through the main framework 2-1, and then the pressure is transmitted to the lower end of the spindle 1-6 through the thrust bearing 3-5, the end cover 3-8 and the fixing bolt 3-2; the thickness of the gap adjusting gaskets 3-7 is adjusted (which can be realized by increasing or decreasing the number of the gap adjusting gaskets 3-7 during assembly), so that the abrasion disc 3-1 is slightly separated from the large end face of the mandrel 1-6; therefore, the main frame 2-1 and the mandrel 1-6 form a rolling friction pair with the bearing through a rotating friction pair formed by the self-lubricating shaft sleeve 3-3, the bogie can rotate around the mandrel 1-6 easily, the direction can be adjusted easily by manpower, and the relevant alignment can be conveniently carried out when the bogie is contracted and fixed (the bogie is lifted and fixed) or is lowered to align with a rail.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. A single axle steerable power truck comprising:
a lifting unit;
the mandrel is fixedly connected with the lifting unit;
the single-wheel-shaft steering frame is in contact with the lifting unit and is driven by the lifting unit to move in the vertical direction;
and the passive steering center plate is rotationally connected with the mandrel and is fixedly connected with the single-wheel-shaft bogie, so that the single-wheel-shaft bogie can rotate around the mandrel.
2. A single-axle steerable power truck according to claim 1, characterized in that the lifting unit comprises:
connecting the frame body;
the supporting oil cylinder is connected with the connecting frame body;
one end of the first connecting rod and one end of the second connecting rod are connected with the supporting oil cylinder respectively;
one end of the parallelogram connecting rod is connected with the connecting frame body, the other end of the parallelogram connecting rod is respectively connected with the other ends of the first connecting rod and the second connecting rod, and deflection is carried out under the action of the supporting oil cylinder, the first connecting rod and the second connecting rod;
and the transition frame is hinged with the end part of the parallelogram connecting rod and is used for contacting with the single-wheel-shaft steering frame, and the upper end surface of the transition frame is always kept in a horizontal state in the lifting or lowering process of the lifting unit.
3. A single-axle steerable power truck according to claim 2, characterized in that: the lifting unit further comprises a side supporting wheel, the side supporting wheel is connected with the transition frame and is in contact with the single-wheel-shaft steering frame, when the single-wheel-shaft steering frame steers, the side supporting wheel can roll on the upper surface of the single-wheel-shaft steering frame, and meanwhile the side supporting wheel has a supporting function.
4. A single-axle steerable power truck according to claim 2, characterized in that: the mandrel is fixedly connected with the transition frame.
5. A single-axle steerable power truck according to claim 1, characterized in that it comprises:
a main frame;
2 axle boxes oppositely arranged and connected with the main framework through a damping element;
the two ends of the wheel shaft are respectively and rotationally connected with the corresponding axle boxes;
the axle box connecting rod is connected with the 2 axle boxes simultaneously;
the output end of the reduction box is connected with the wheel shaft;
the planetary speed reducer is connected with the input end of the reduction gearbox;
the hydraulic motor is connected with the input end of the planetary reducer and is fixed on the axle box through a motor auxiliary supporting seat;
and a joint bearing is connected between the reduction gearbox hanging rod and the lug plate of the reduction gearbox and is fixedly connected with the axle box connecting rod.
6. A single-axle steerable power truck according to claim 5, characterized in that: and a damping pad is arranged between the motor auxiliary supporting seat and the axle box.
7. A single axle steerable power truck according to claim 5, wherein the passive steering center wheel comprises:
the abrasion disc is connected with the main frame, and when the main frame rotates, the abrasion disc and the mandrel form a sliding friction pair together; the self-lubricating shaft sleeve is sleeved in the central inner hole of the main frame and is in contact with the mandrel to form a rotary friction pair;
the end cover is connected with the mandrel through a fixing bolt;
the thrust bearing is arranged between the end cover and the mandrel to form a rolling friction pair;
the main frame is pressed down on the thrust bearing, and then pressure is transmitted to the lower end of the mandrel through the thrust bearing, the end cover and the fixing bolt.
8. The power truck of claim 7, wherein the passive steering center plate further comprises a spacer, the spacer being disposed between the spindle and the end cap, wherein the thickness of the spacer is adjusted to allow disengagement between the wear plate and the spindle.
9. The power truck of claim 7, wherein the passive steering center disk further comprises a frame oil seal, the frame oil seal covers the thrust bearing to prevent external dust and impurities from entering a rotating seal cavity of the thrust bearing, and the rotating seal cavity is formed by the spindle and the end cover.
10. The single axle steerable power truck of claim 7, wherein the passive steering center hub further comprises an oil cup in conjunction with the rotating seal cavity for filling the rotating seal cavity with grease.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011469966.1A CN112498403A (en) | 2020-12-15 | 2020-12-15 | Power bogie with single wheel shaft capable of steering |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011469966.1A CN112498403A (en) | 2020-12-15 | 2020-12-15 | Power bogie with single wheel shaft capable of steering |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112498403A true CN112498403A (en) | 2021-03-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011469966.1A Pending CN112498403A (en) | 2020-12-15 | 2020-12-15 | Power bogie with single wheel shaft capable of steering |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112498403A (en) |
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| EP1507671A1 (en) * | 2002-05-24 | 2005-02-23 | Ab Sjölanders Smides & Mekaniska Verkstad | A vehicle that can be driven on both roads and railroad tracks |
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| CN103935285A (en) * | 2014-04-30 | 2014-07-23 | 四川森田消防装备制造有限公司 | Bidirectional-traveling road-rail dual-purpose multifunctional emergency rescuing fire fighting truck |
| CN106494166A (en) * | 2016-10-25 | 2017-03-15 | 中车四方车辆有限公司 | A kind of road rail vehicle |
| CN108638772A (en) * | 2018-02-28 | 2018-10-12 | 中车四方车辆有限公司 | Link-type guider and road rail vehicle |
| CN108715117A (en) * | 2018-07-10 | 2018-10-30 | 徐工集团工程机械有限公司 | A kind of dual-purpose assembly of rail |
| CN108944985A (en) * | 2018-07-27 | 2018-12-07 | 中车长江车辆有限公司 | A kind of single-axle bogie and road rail vehicle |
| CN109398005A (en) * | 2018-11-29 | 2019-03-01 | 襄阳协利成机车车辆工程设备有限公司 | Bogie units and road rail vehicle walking system comprising the bogie units |
| CN110682748A (en) * | 2019-11-19 | 2020-01-14 | 徐工集团工程机械有限公司 | Steering mechanism and rail dual-purpose vehicle |
| CN112009514A (en) * | 2020-09-02 | 2020-12-01 | 中国铁建高新装备股份有限公司 | Single-shaft bogie and railway maintenance mechanical equipment |
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2020
- 2020-12-15 CN CN202011469966.1A patent/CN112498403A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1507671A1 (en) * | 2002-05-24 | 2005-02-23 | Ab Sjölanders Smides & Mekaniska Verkstad | A vehicle that can be driven on both roads and railroad tracks |
| CN201512369U (en) * | 2009-09-18 | 2010-06-23 | 武桥重工集团股份有限公司 | Bearing traction pin mechanism capable of carrying out rotation with multiple freedom degree |
| CN103935285A (en) * | 2014-04-30 | 2014-07-23 | 四川森田消防装备制造有限公司 | Bidirectional-traveling road-rail dual-purpose multifunctional emergency rescuing fire fighting truck |
| CN106494166A (en) * | 2016-10-25 | 2017-03-15 | 中车四方车辆有限公司 | A kind of road rail vehicle |
| CN108638772A (en) * | 2018-02-28 | 2018-10-12 | 中车四方车辆有限公司 | Link-type guider and road rail vehicle |
| CN108715117A (en) * | 2018-07-10 | 2018-10-30 | 徐工集团工程机械有限公司 | A kind of dual-purpose assembly of rail |
| CN108944985A (en) * | 2018-07-27 | 2018-12-07 | 中车长江车辆有限公司 | A kind of single-axle bogie and road rail vehicle |
| CN109398005A (en) * | 2018-11-29 | 2019-03-01 | 襄阳协利成机车车辆工程设备有限公司 | Bogie units and road rail vehicle walking system comprising the bogie units |
| CN110682748A (en) * | 2019-11-19 | 2020-01-14 | 徐工集团工程机械有限公司 | Steering mechanism and rail dual-purpose vehicle |
| CN112009514A (en) * | 2020-09-02 | 2020-12-01 | 中国铁建高新装备股份有限公司 | Single-shaft bogie and railway maintenance mechanical equipment |
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Application publication date: 20210316 |
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