CN110939028A - Adjustable support of magnetic levitation track - Google Patents
Adjustable support of magnetic levitation track Download PDFInfo
- Publication number
- CN110939028A CN110939028A CN201911308821.0A CN201911308821A CN110939028A CN 110939028 A CN110939028 A CN 110939028A CN 201911308821 A CN201911308821 A CN 201911308821A CN 110939028 A CN110939028 A CN 110939028A
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- Prior art keywords
- jacking
- track
- support plate
- shell
- block
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Classifications
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B25/00—Tracks for special kinds of railways
- E01B25/30—Tracks for magnetic suspension or levitation vehicles
- E01B25/305—Rails or supporting constructions
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/12—Grating or flooring for bridges; Fastening railway sleepers or tracks to bridges
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B2201/00—Fastening or restraining methods
- E01B2201/02—Fastening or restraining methods by wedging action
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B2201/00—Fastening or restraining methods
- E01B2201/04—Fastening or restraining methods by bolting, nailing or the like
Abstract
The invention discloses an adjustable support of a magnetic suspension track, which comprises a support plate and two jacking components, wherein the support plate is used for being connected between a track beam and a bearing beam, the two jacking components are arranged below the support plate and are respectively arranged at two opposite sides of the support plate, and each jacking component is used for enabling the corresponding side of the support plate to be lifted or lowered so as to enable two sides of the track beam in the width direction to be lifted or lowered respectively. The device adopts a two-stage adjusting mechanism to effectively adjust the installation precision and the use precision of the single-section track beam, reduces the processing and installation precision of the bearing beam and the substructure, reduces the installation difficulty and the cost, effectively meets the adjustment requirements of the track beam under various application scenes, is convenient for standardization and unification of the design of the track beam, is beneficial to ensuring the running speed and the riding comfort of a magnetic suspension line in the operation process, improves the reliability of a magnetic suspension track, and especially has great significance for the operation of high-speed magnetic suspension in China.
Description
Technical Field
The invention relates to the technical field of magnetic suspension track supports, in particular to an adjustable support of a magnetic suspension track.
Background
In order to ensure the safety and comfort of the train during high-speed running, a high-speed maglev train (for example, the speed per hour exceeds 400 km) system puts higher design and manufacturing requirements on the track. For example, in the aspect of structural rigidity, the midspan deflection of the single-span simple-support track beam under the action of a vehicle-mounted vehicle is required to be less than L/4800(L is the span of the simple-support beam), and is far higher than L/600-L/800 required by highways and railways. In addition, the manufacturing and mounting accuracy of the three functional surfaces of the rail is required to be controlled within 1 mm. These design requirements are directly dependent on the track structure form and the later debugging and installation.
The existing high-speed magnetic suspension system mainly has two types of laying modes, namely a low-position circuit structure and an elevated circuit structure. The common structural characteristics are that the track beam structure with lower rigidity is fixedly arranged on the lower supporting structure (such as a bearing box beam) with higher structural rigidity, the lower supporting structure is connected with a structural foundation (such as the ground) through an adjusting support, and the precision guarantee of the functional surface of the magnetic suspension system is mainly realized by adjusting the lower supporting structure with higher structural rigidity, namely, the use precision required by the track beam is indirectly guaranteed by adjusting the adjusting support under the lower supporting structure. However, the adjustment mainly aims at the precision control during installation, the continuous precision fine adjustment requirement of the later-stage operation maintenance segment is difficult to guarantee, and the adjustment cannot be carried out aiming at the use precision of a single-section track beam, so that the longer the operation time is, the more difficult the design speed per hour is to guarantee; secondly, the adjusting support at the bottom of the lower supporting structure bears the weight of the lower supporting structure and the track beam and ensures the adjusting precision, the design and the processing of the existing support cannot meet the requirements, the cost is high, the installation process is complex, and the precision control is difficult.
Disclosure of Invention
The invention aims to overcome the defects that the existing magnetic levitation track beam is ensured to have precision through an adjusting support under a lower supporting structure, the design and processing are difficult, the cost is additionally increased, the installation precision control requirement is high, the precision adjusting requirement in the operation stage and the precision adjusting requirement of a single-section track beam cannot be met, and the like, and provides the adjustable support of the magnetic levitation track.
In order to achieve the purpose, the invention provides the following technical scheme:
the utility model provides a magnetic levitation orbital adjustable support, contains bedplate and two jacking parts, the bedplate is used for connecting between track roof beam and spandrel girder, the bedplate is followed the width direction setting of track roof beam, two the jacking part is all located bedplate below, two the jacking part is located respectively the relative both sides of bedplate, every the jacking part is used for making the corresponding side of bedplate risees or reduces, so that the both sides of track roof beam width direction risee or reduce respectively.
By adopting the adjustable support of the magnetic suspension track, the height of the track beam at different sections can be adjusted by arranging the adjustable support between the track beam and the bearing beam and adopting the support plates with different heights or adopting the jacking parts to adjust the height of the support plates according to requirements, meanwhile, the heights of the two opposite sides of the support plates can be respectively adjusted by matching with the two jacking parts, so that the two sides of the track beam in the width direction are respectively raised or lowered, namely the height difference between the two sides of the track beam can be finely adjusted, the accuracy of the track at a curve section can be favorably controlled and adjusted, the support plates are respectively connected and fixed with the track beam and the bearing beam after the adjustment is finished, the whole height and the height difference between the two sides of the single-section track beam are effectively adjusted by adopting a two-stage adjusting mechanism, so as to adjust the installation accuracy and the use accuracy of the track beam, and effectively reduce the processing, the bearing beam and the lower structure, The installation accuracy, reduce bridge beam supports's design and processing requirement, the precision adjustment of track roof beam and the precision adjustment of spandrel girder are independent each other, show the degree of difficulty and the maintenance intensity of laying of reducing high-speed magnetic levitation full line track roof beam, reduce cost by a wide margin, effectively satisfy the adjustment demand under the various application scenes of track roof beam, the standardization and the unification of the track roof beam design of being convenient for, be favorable to guaranteeing the functioning speed and the comfort level of magnetic levitation line at the operation in-process, improve the orbital reliability of magnetic levitation, guarantee the possibility of full line scope long-term maintenance, good application prospect has, especially, have great meaning to the operation of china's high-speed magnetic levitation.
Preferably, every jacking part contains jacking piece and transmission part, be equipped with left wedge and right wedge on the transmission part, the inclined plane of left side wedge with the inclined plane of right wedge sets up in opposite directions, drives transmission part can make left side wedge and right wedge are close to relatively or keep away from relatively, so that correspond jacking piece risees or reduces.
Further preferably, the transmission part comprises a rod piece, a left-handed thread section and a right-handed thread section are arranged on the rod piece, the left-handed thread section and the right-handed thread section are coaxially arranged, the left wedge block is in threaded connection with the left-handed thread section, the right wedge block is in threaded connection with the right-handed thread section, and the rod piece is provided with a locking part.
Adopt above-mentioned mode of setting, the jacking piece is located the inclined plane of left side wedge with on the inclined plane of right side wedge, guarantee left side wedge and right wedge rise simultaneously or descend the same distance to guarantee the stable contact of jacking part and bedplate bottom, adopt horizontal member to rotate and make the jacking piece is vertical to rise or reduce, and the jacking roughness is good, and the change of the jacking part of being convenient for prevents moving back the nature good, need not to carry out too big design modification to the structure of track roof beam, just can handle the track roof beam and appear downwarping or upwarp deformation phenomenon in the operation link, can also according to the position that the jacking part set up, to the precision effective control of going up a slope or downhill path, ensure driving speed and comfort level.
Further preferably, every the jacking part is equipped with the casing outward, every the casing all connect in on the spandrel girder, left side wedge and right wedge all locate the correspondence on the bottom surface of casing, the top surface of the housing is equipped with through-hole one, the overall dimension of through-hole one with the overall dimension adaptation of jacking piece, the relative both sides face of casing still is equipped with through-hole two and through-hole three, through-hole two and through-hole three are located wears to establish the member, the casing contains can dismantle the connection casing one and casing two.
Further preferably, the shell is bolted to the top surface of the load beam.
The first shell and the second shell are assembled to form the shell, so that the transmission component is convenient to mount.
Further preferably, the side surface of the jacking block is provided with scale marks.
By adopting the arrangement mode, according to the side surface of the jacking block protrudes out of the scale marks on the top surface of the shell, the jacking heights of the two sides of the width of the track beam are accurately controlled, and the adjustment precision is improved.
Preferably, the slope of the left wedge block of each jacking component is the same as the slope of the right wedge block, and the thread pitch of the left-handed thread section is the same as the thread pitch of the right-handed thread section.
Further preferably, the left-hand thread section and the right-hand thread section are both trapezoidal threads.
The trapezoidal thread has high rigidity and is not easy to damage.
It is further preferred that the left-hand thread segment and the right-hand thread segment are of equal length.
Preferably, the support plate is provided with a pressing plate, the support plate is respectively connected to the pressing plate and the bearing beam through foundation bolt assemblies, the pressing plate is connected with compression bolts, and each compression bolt penetrates through the corresponding pressing plate and abuts against the gasket on the top surface of the corresponding side of the lower flange.
In summary, compared with the prior art, the invention has the beneficial effects that:
1. the adjustable support of the magnetic levitation track adopts a two-stage adjusting mechanism to effectively adjust the installation precision and the use precision of a single-section track beam, reduces the processing and installation precision of a bearing beam and a substructure, reduces the design and processing requirements of a bridge support, has mutually independent precision adjustment of the track beam and the precision adjustment of the bearing beam, obviously reduces the laying difficulty and the maintenance strength of the magnetic levitation full-line track beam, greatly reduces the cost, effectively meets the adjustment requirements of the track beam under various application scenes, facilitates the standardization and the unification of the track beam design, is favorable for ensuring the running speed and the riding comfort of a magnetic levitation line in the operation process, improves the reliability of the magnetic levitation track, has good application prospect, and particularly has great significance for the operation of high-speed magnetic levitation in China.
Description of the drawings:
FIG. 1 is a schematic view of an adjustable support of a magnetic levitation track according to the present invention;
FIG. 2 is a partial exploded view of an adjustable support of a magnetic levitation track in embodiment 1;
fig. 3 is a partial sectional view of the jacking member in embodiment 1;
fig. 4 is a structural plan view of the jack-up member in embodiment 1.
The labels in the figure are: the method comprises the following steps of 1-a support plate, 2-a track beam, 3-a bearing beam, 4-a jacking block, 51-a left wedge-shaped block, 52-a right wedge-shaped block, 6-a rod piece and 7-a foundation bolt assembly.
Detailed Description
The invention is described in further detail below with reference to the figures and the embodiments. It should be understood that the scope of the above-described subject matter is not limited to the following examples, and any techniques implemented based on the disclosure of the present invention are within the scope of the present invention.
Example 1
As shown in fig. 1 to 4, the adjustable support for a magnetic levitation track according to the present invention comprises a support plate 1 and two jacking components, wherein the support plate 1 is used for being connected between a track beam 2 and a load-bearing beam 3, the two jacking components are respectively disposed on two opposite sides of the support plate 1, and each jacking component is used for raising or lowering a corresponding side of the support plate 1, so as to respectively raise or lower two sides of the track beam 2 in a width direction.
The bearing beam 3 can be of a reinforced concrete structure, compared with a steel beam, the cost and the processing precision are effectively reduced, the support plate 1 is respectively connected with the track beam 2 and the bearing beam 3, in the embodiment, as shown in fig. 1-2, the support plate 1 is arranged along the width direction of the track beam 2, the support plate 1 is of a groove structure, the top surface of the support plate 1 is provided with a groove, the track beam 2 comprises an upper flange, a web and a lower flange, the lower flange 22 is positioned in the groove, the bearing area is effectively increased, the track beam 2 after adjustment is effectively limited and fixed, the distance between two jacking parts is farther, the adjustment precision is improved, the fine adjustment of the height difference between the two sides is more suitable, the support plate 1 is provided with two pressing plates which are respectively arranged on the two sides of the web, and the pressing plates are connected with pressing bolts, each compression bolt penetrates through the corresponding pressure plate and abuts against the gasket on the top surface of the corresponding side of the lower flange, and the inclination degree of the top surface of the upper flange 21 can be finely adjusted by utilizing the difference in thickness of the gaskets on the two sides, namely, a third-stage adjusting mechanism is added; or the pressing plate and the support plate 1 are of an integrally formed structure, that is, the support plate 1 is provided with an inverted T-shaped groove, the support plate 1 is respectively connected with the pressing plate and the bearing beam 3 through an anchor bolt assembly 7, the bottom surface of the lower flange is provided with a first arc-shaped surface, the top surface of the groove is provided with a second arc-shaped surface, the shape and the size of the second arc-shaped surface are matched with the shape and the size of the first arc-shaped surface, the arc length direction of the first arc-shaped surface is arranged along the width direction of the lower flange, so that the effect of fixing, inclining and fine adjustment is facilitated, the precision of top surface adjustment of the track beam 2 is ensured, preferably, the first arc-shaped surface is an upper arch surface, the dead weight of the track beam 2 is effectively reduced, the cost is reduced, when the height of the support plate 1 is adjusted by the jacking component, the anchor bolt assembly 7 and the compression bolt are respectively screwed down, the operation quality of the magnetic levitation vehicle is improved, and the height difference fine adjustment of two sides of the top surface of the track beam 2 can be effectively realized by connecting and fixing two magnetic levitation vehicles; meanwhile, the support plate 1 is convenient to replace or maintain, the influence on the track beam 2 is reduced, and the maintenance cost is saved; and, the track beam 2 of each section can adopt the support plate 1 of different height to adjust the height of the track beam 2 of different sections, or different positions of the same track beam 2 can adopt the support plate 1 of different height to make the height of a certain position of the track beam 2 rise or fall.
The track roof beam 2 can adopt hollow structure (not shown in the figure), reduces the installation degree of difficulty of track roof beam 2 by a wide margin, has reduced the deformation influence of track roof beam 2 dead weight to the longspan spandrel girder simultaneously, the length of track roof beam 2 is 6-8m, the bulk rigidity of track roof beam 2 can improve, and the 2 deflection of single section track roof beam reduces, and then has reduced the deflection of operation full line, also can be convenient for adjust and change the precision of track roof beam 2 simultaneously.
As shown in fig. 2-4, two of the jacking components are both disposed below the support plate 1, each jacking component is connected to a load-bearing beam 3 through a bolt (the mounting hole is not shown), the two jacking components are respectively disposed at two opposite sides of the support plate 1, each jacking component is used for raising or lowering the corresponding side of the support plate 1 so as to raise or lower two sides of the track beam 2 in the width direction respectively, preferably, each jacking component comprises a jacking block 4 and a transmission component, further preferably, the transmission component comprises a rod member 6, the rod member is provided with a left-handed thread section and a right-handed thread section, the left-handed thread section and the right-handed thread section are both trapezoidal threads, the trapezoidal threads have high rigidity and are not easy to damage, the left-handed thread section and the right-handed thread section are coaxially disposed, and the lengths of the left-handed thread section and the right-handed thread section are equal, be equipped with left wedge 51 and right wedge 52 on the drive disk assembly, the inclined plane of left side wedge 51 with the inclined plane of right wedge 52 sets up in opposite directions, every jacking component the slope on the inclined plane of left side wedge 51 is the same with the slope on the inclined plane of right wedge 52, left side wedge 51 threaded connection in the left-hand thread section, right side wedge 52 threaded connection in the right-hand thread section, the pitch in left-hand thread section is the same with the pitch in right-hand thread section, guarantees left side wedge 51 and right wedge 52 rise simultaneously or descend the same distance, jacking piece 4 is located the inclined plane of left side wedge 51 with on the inclined plane of right wedge 52 to guarantee the stable contact of jacking component and bedplate 1 bottom, through rotating member 6 can make left side wedge 51 and right wedge 52 are close to relatively or keep away from relatively, so as to raise or lower the corresponding jacking blocks 4.
Jacking part through both sides can make 2 top surfaces of track roof beam rise or reduce, reaches the effect of highly carrying out the fine setting to the whole track face, owing to adopt horizontal member 6 to rotate and make jacking piece 4 is in vertical rising or reduction, and the jacking roughness is good, and the change of the jacking part of being convenient for prevents moving back the nature good, need not to carry out too big design modification to the structure of track roof beam 2, just can deal with track roof beam 2 and appear downwarping or upwarping deformation in the operation link, can also according to the position that the support set up, to the precision effective control of upslope or downhill path district section, ensures driving speed and comfort level.
As shown in fig. 3-4, a housing is provided outside each jacking component, bolt holes are provided around the bottom surface of the housing, each housing is connected to the bearing beam 3 through bolts, so as to fix the jacking component and ensure stable precision after adjustment, the left wedge-shaped block 51 and the right wedge-shaped block 52 are provided on the bottom surface of the corresponding housing, the top surface of the housing is provided with a first through hole, the shape and size of the first through hole are adapted to the shape and size of the jacking block 4, two opposite side surfaces of the housing are provided with a second through hole and a third through hole, the second through hole and the third through hole are used for penetrating the rod 6, the rod 6 is provided with a locking component, the rod 6 is a lead screw, the adjustment precision is high, the locking component is a nut, the housing comprises a first housing and a second housing which are detachably connected, and the first housing and the second housing can be as shown in fig, be the box body on right side in the picture and left end cover respectively, promptly the end cover is located nut one side, perhaps if casing one and casing two can be as shown in fig. 4, do respectively the casing is followed two parts that 6 axes of member dissected, casing one is convenient for splice the shaping with casing two, and is convenient right member 6, left wedge 51 and right wedge 52 are changed, can effectively rain-proof, prevent laying dust simultaneously, and further preferred, the side of jacking piece 4 is equipped with the scale mark, according to the side protrusion of jacking piece 4 the scale mark of casing top surface is convenient for right the jacking height of 2 width both sides of track roof beam carries out accurate control, is favorable to improving the adjustment accuracy.
When the height of the corresponding side of the track beam is required to be adjusted, the nut is loosened, the screw rod is rotated by using a tool, the lifting of the jacking block 4 is realized, and the height adjustment of the corresponding side of the track beam is indirectly completed; and after the adjustment is finished, the nut is screwed down to finish the locking action of the lead screw.
The adjustable support of the magnetic suspension track can meet the fine tuning requirement of the track beam due to the large curve radius requirement of high-speed magnetic suspension and small ascending and descending amplitude, the device can fine tune the mounting precision and the use precision of a single-section track beam by adopting a three-stage adjusting mechanism of the support plate 1, the jacking component and the gasket, effectively reduce the processing and mounting precision of a bearing beam and a substructure, reduce the design and processing requirements of a bridge support, obviously reduce the laying difficulty and the maintenance strength of the magnetic suspension full-line track beam, greatly reduce the cost, effectively meet the adjusting requirement of the track beam under various application scenes, facilitate the standardization and unification of the track beam design, and be beneficial to ensuring the running speed and riding comfort of a magnetic suspension line in the operation process, the reliability of the magnetic levitation track is improved, the application prospect is good, and the method has great significance for the operation of high-speed magnetic levitation in China.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. The utility model provides a magnetic levitation orbital adjustable support, its characterized in that contains bedplate (1) and two jacking parts, bedplate (1) is used for connecting between track roof beam (2) and spandrel girder (3), two the jacking part is all located bedplate (1) below, two the jacking part is located respectively the relative both sides of bedplate (1), every the jacking part is used for making the corresponding side of bedplate (1) risees or reduces, so that the both sides of track roof beam (2) width direction rise respectively or reduce.
2. The support according to claim 1, characterized in that each jacking component comprises a jacking block (4) and a transmission component, the transmission component is provided with a left wedge block (51) and a right wedge block (52), the inclined plane of the left wedge block (51) and the inclined plane of the right wedge block (52) are oppositely arranged, and the transmission component is driven to enable the left wedge block (51) and the right wedge block (52) to be relatively close to or relatively far away from each other so as to enable the corresponding jacking block (4) to be lifted or lowered.
3. A support according to claim 2, characterized in that said transmission means comprises a rod member (6) having a left-hand threaded section and a right-hand threaded section, said left-hand threaded section and said right-hand threaded section being coaxially arranged, said left wedge block (51) being threadedly connected to said left-hand threaded section, said right wedge block (52) being threadedly connected to said right-hand threaded section, said rod member (6) being provided with locking means.
4. The support according to claim 3, characterized in that each jacking component is externally provided with a shell, each shell is connected to the bearing beam (3), the left wedge-shaped block (51) and the right wedge-shaped block (52) are arranged on the bottom surface of the corresponding shell, the top surface of the shell is provided with a first through hole, the shape and size of the first through hole are matched with the shape and size of the jacking block (4), two opposite side surfaces of the shell are further provided with a second through hole and a third through hole, the second through hole and the third through hole are used for penetrating through the rod (6), and the shell comprises the first shell and the second shell which are detachably connected.
5. Support according to claim 4, characterized in that the side of the jacking block (4) is provided with graduated markings.
6. A support according to claim 3, characterized in that the slope of the left wedge block (51) and the slope of the right wedge block (52) of each jacking member are the same, and the pitch of the left-hand thread segment is the same as the pitch of the right-hand thread segment.
7. The mount of claim 3, wherein said left-hand thread segment and said right-hand thread segment are both trapezoidal threads.
8. The mount of claim 3, wherein said left-hand thread segment and said right-hand thread segment are of equal length.
9. A support according to any one of claims 1-8, characterized in that the support plate (1) is provided with a pressure plate, the support plate (1) is connected to the pressure plate and the bearing beam (3) by means of anchor bolt assemblies (7), and pressure bolts are connected to the pressure plate, each of which pressure bolts passes through the corresponding pressure plate and abuts against a gasket on the top surface of the corresponding side of the lower flange.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911308821.0A CN110939028A (en) | 2019-12-18 | 2019-12-18 | Adjustable support of magnetic levitation track |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911308821.0A CN110939028A (en) | 2019-12-18 | 2019-12-18 | Adjustable support of magnetic levitation track |
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| Publication Number | Publication Date |
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| CN110939028A true CN110939028A (en) | 2020-03-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911308821.0A Pending CN110939028A (en) | 2019-12-18 | 2019-12-18 | Adjustable support of magnetic levitation track |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111501563A (en) * | 2020-04-22 | 2020-08-07 | 丽水学院 | Adjustable bridge support |
| CN111620234A (en) * | 2020-04-29 | 2020-09-04 | 太原重工股份有限公司 | Multi-directional track adjusting device |
| CN113026436A (en) * | 2021-03-24 | 2021-06-25 | 陶应林 | Track roadbed structure |
-
2019
- 2019-12-18 CN CN201911308821.0A patent/CN110939028A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111501563A (en) * | 2020-04-22 | 2020-08-07 | 丽水学院 | Adjustable bridge support |
| CN111501563B (en) * | 2020-04-22 | 2021-09-07 | 丽水学院 | Adjustable bridge support |
| CN111620234A (en) * | 2020-04-29 | 2020-09-04 | 太原重工股份有限公司 | Multi-directional track adjusting device |
| CN113026436A (en) * | 2021-03-24 | 2021-06-25 | 陶应林 | Track roadbed structure |
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