CN112746532A - Passive pre-pressing type magnetic suspension turnout girder vibration suppression structure - Google Patents

Passive pre-pressing type magnetic suspension turnout girder vibration suppression structure Download PDF

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Publication number
CN112746532A
CN112746532A CN202011610402.5A CN202011610402A CN112746532A CN 112746532 A CN112746532 A CN 112746532A CN 202011610402 A CN202011610402 A CN 202011610402A CN 112746532 A CN112746532 A CN 112746532A
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China
Prior art keywords
turnout
girder
pressing
passive
vibration suppression
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CN202011610402.5A
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Chinese (zh)
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CN112746532B (en
Inventor
李忠继
陈志贤
徐浩
徐银光
杨吉忠
林红松
冯读贝
代丰
肖飞知
陈志辉
蒋尧
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China Railway Eryuan Engineering Group Co Ltd CREEC
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Sichuan High - Tech Rail Transit Industry Technology Research Institute
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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
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
    • E01B19/00—Protection of permanent way against development of dust or against the effect of wind, sun, frost, or corrosion; Means to reduce development of noise
    • E01B19/003—Means for reducing the development or propagation of noise
    • 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
    • E01B25/32—Stators, guide rails or slide rails
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A30/00—Adapting or protecting infrastructure or their operation
    • Y02A30/30—Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Railway Tracks (AREA)

Abstract

The invention discloses a passive pre-pressing type magnetic suspension turnout girder vibration suppression structure, which comprises a turnout girder and a passive pre-pressing mechanism, wherein the turnout girder is provided with an upward pre-camber, the passive pre-pressing mechanism comprises a first structure and a second structure, the second structure is provided with a pre-pressing amount, the pre-pressing amount is equal to the maximum value of the pre-camber, and the first structure can drive the turnout girder to move along the second structure so that the height of the turnout girder is reduced; the first structure is fixedly connected with the turnout main beam, and the second structure is fixedly connected with a track foundation; or the second structure is fixedly connected with the turnout main beam, and the first structure is fixedly connected with a track foundation. The passive pre-pressing type magnetic suspension turnout girder vibration suppression structure provided by the invention realizes vibration suppression by pressing down the turnout girder with pre-camber through the passive pre-pressing mechanism, and has the advantages of simple structure, good suppression effect and wide effective frequency band.

Description

Passive pre-pressing type magnetic suspension turnout girder vibration suppression structure
Technical Field
The invention relates to the technical field of magnetic suspension rail transit, in particular to a passive pre-pressing type magnetic suspension turnout girder vibration suppression structure.
Background
The medium-low speed magnetic levitation track traffic (generally, the speed per hour is lower than 120km/h) is used as a novel track form, has the advantages of safe operation, no pollution and low manufacturing cost, and has wide application prospect in the development of urban track traffic. The medium-low speed maglev train adopts a rail-embracing operation mode, the electromagnet arranged on the suspension frame of the train is controlled by the suspension controller to adsorb the F rail, so that the maglev train is in a suspension state, and the linear motor drives the train to operate on the rail. However, in practice, the magnetic levitation track is not absolutely rigid and completely flat, so the levitation controller needs to adjust the control force through real-time control, so that the train can be levitated at a fixed height on the track, but the continuous adjustment of the control force can cause the track structure to vibrate.
The structure under the rail is complicated, and has bridges, roadbeds, turnouts and the like, and different structures under the rail can lead the rail to show different vibration characteristics. Therefore, vibration research needs to be respectively carried out aiming at different structural vibrations of tracks, bridges, turnouts and the like, and measures for solving the structural vibration of the medium and low-degree magnetic suspension tracks are searched from a plurality of angles such as a suspension controller, structural optimization, structural vibration reduction and the like. Because the medium-low speed magnetic suspension turnout adopts a steel beam structure, relative to an interval track beam, the self weight is small, the structure self-vibration frequency is low, the structure damping is low, and when the suspension control adaptability is not strong enough, the train is easy to generate turnout coupling vibration through a turnout area. Therefore, in order to ensure that the maglev train smoothly passes through the turnout, the turnout coupling vibration needs to be restrained.
The existing turnout vibration suppression method comprises a turnout vibration suppression method based on a dynamic vibration absorber and a turnout suppression method based on passive damping, and the turnout vibration suppression method is not only complicated in structure, but also limited in vibration control frequency range.
Disclosure of Invention
The invention aims to: aiming at the problems of complex structure and limited vibration control frequency band of the existing turnout vibration suppression method, the passive pre-pressing type magnetic suspension turnout girder vibration suppression structure is provided.
In order to achieve the purpose, the invention adopts the technical scheme that:
a passive pre-pressing type magnetic suspension turnout girder vibration suppression structure comprises a turnout girder and a passive pre-pressing mechanism, wherein the turnout girder is provided with an upward pre-camber, the passive pre-pressing mechanism comprises a first structure and a second structure, the second structure is provided with a pre-pressing amount, the pre-pressing amount is equal to the maximum value of the pre-camber, and the first structure can drive the turnout girder to move along the second structure so that the height of the turnout girder is reduced;
the first structure is fixedly connected with the turnout main beam, and the second structure is fixedly connected with a track foundation; or the second structure is fixedly connected with the turnout main beam, and the first structure is fixedly connected with a track foundation.
The passive pre-pressing mechanism drives the turnout main beam to move downwards when turnout switching is in place, so that the turnout main beam is passively pressed downwards, and the turnout main beam is changed into a straight state.
The passive pre-pressing type magnetic suspension turnout girder vibration suppression structure provided by the invention realizes vibration suppression by pressing down the turnout girder with pre-camber through the passive pre-pressing mechanism, and has the advantages of simple structure, good suppression effect and wide effective frequency band.
As a preferable mode of the present invention, the second structure includes a pre-pressing surface, the pre-pressing surface includes a guiding section and a positioning section that are connected to each other, the guiding section is of an inclined surface structure, a height difference exists between the positioning section and the guiding section, and a maximum value of the height difference between the guiding section and the positioning section is the pre-pressing amount.
In a preferred embodiment of the present invention, the introduction section is located at both ends of the positioning section.
As a preferable aspect of the present invention, the second structure further includes a second mounting seat, and the preload face is mounted by the second mounting seat.
As a preferable scheme of the present invention, an elastic connection member is connected between the second mounting seat and the pre-pressing surface, so as to facilitate adjustment of the rigidity of the passive pre-pressing mechanism.
As a preferable aspect of the present invention, the first structure includes a rolling device capable of rolling along the preload face. The rolling device firstly enters the leading-in section and then gradually enters the positioning section, so that the main beam of the turnout is driven to be pressed downwards. Instead of rolling means, sliding means may also be used, which slide along the pre-pressing surface.
As a preferred aspect of the present invention, the rolling means includes a roller, a rolling ball, and other components that can perform similar functions.
As a preferable aspect of the present invention, the first structure further includes a first mounting seat, and the rolling device is mounted through the first mounting seat.
As a preferable scheme of the present invention, an elastic connection member is connected between the first mounting seat and the rolling device, so that the stiffness of the passive pre-pressing mechanism can be conveniently adjusted.
As a preferable scheme of the invention, the pre-camber is more than 150% of the vertical deflection of the track beam under the action of the maximum load of the train.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. the passive pre-pressing type magnetic suspension turnout girder vibration suppression structure provided by the invention realizes vibration suppression by pressing down the turnout girder with pre-camber through the passive pre-pressing mechanism, and has the advantages of simple structure, good suppression effect and wide effective frequency band.
2. The passive pre-pressing type magnetic suspension turnout girder vibration suppression structure changes the traditional turnout girder connection system, avoids the possible hyperstatic problem of three-trolley support of the turnout girder, simultaneously enhances the connection rigidity of the turnout girder and a track foundation, and changes the vibration frequency of the turnout girder. Therefore, the coupling vibration of the turnout of the maglev train can be inhibited, the problem of coupling vibration of the turnout of the medium-low speed maglev train is fundamentally solved, the stress of the turnout is improved, and the running stability of the train is improved.
Drawings
Fig. 1 is an installation schematic diagram (top view) of a passive pre-compression type magnetic suspension turnout girder vibration suppression structure.
Fig. 2 is an installation schematic diagram (front view) of the passive pre-compression type magnetic suspension turnout girder vibration suppression structure.
Fig. 3 is a schematic diagram of the pre-camber of the turnout main beam according to the invention.
Fig. 4 is a schematic view of a section a-a in fig. 1 of a passive pre-stressed magnetic suspension turnout main beam vibration suppression structure according to embodiment 1 of the invention.
Fig. 5 is a front view of the passive pre-stressed magnetic levitation turnout main beam vibration suppression structure shown in fig. 4.
Fig. 6 is a schematic view of a section a-a in fig. 1 of a passive pre-stressed magnetic suspension turnout girder vibration suppression structure according to embodiment 2 of the invention.
Fig. 7 is a schematic view of a section a-a in fig. 1 of a passive pre-stressed magnetic levitation turnout girder vibration suppression structure according to embodiment 3 of the invention.
Icon: 1-turnout main beam, 2-forward foundation, 3-lateral foundation, 4-first structure, 41-first mounting seat, 42-rolling device, 5-second structure, 51-second mounting seat, 52-prepressing surface, 521-leading-in section, 522-positioning section, 6-pre-arch line, 7-horizontal line and 8-elastic connecting piece.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
As shown in fig. 1-2, a passive pre-pressing type magnetic suspension turnout girder vibration suppression structure comprises a turnout girder 1 and a passive pre-pressing mechanism, wherein the turnout girder 1 is provided with an upward pre-camber, the maximum value of the pre-camber in a free state (indicating that the passive pre-pressing mechanism is not operated and has no vehicle load) is h, a pre-camber line 6 is shown in fig. 3, and 7 in fig. 3 is a horizontal line. The pre-camber h is more than 150% of the vertical deflection of the track beam under the action of the maximum load of the train.
As shown in fig. 4-5, the passive pre-pressing mechanism in this embodiment includes a first structure 4 and a second structure 5, the first structure 4 is fixedly connected below the switch main beam 1, the second structure 5 is respectively disposed on the forward position foundation 2 and the lateral position foundation 3, and the second structure 5 is fixedly connected above the track foundation (the forward position foundation 2 and the lateral position foundation 3).
The first structure 4 includes a first mounting base 41 and a rolling device 42, and the rolling device 42 is mounted through the first mounting base 41. The rolling device 42 may be a roller or a rolling ball, and the contact surface of the rolling device 42 may be a rigid contact surface or an elastic contact surface.
The second structure 5 is provided with a pre-pressing amount, the pre-pressing amount is equal to the maximum value h of the pre-camber, specifically, the second structure 5 comprises a second mounting seat 51 and a pre-pressing surface 52, and the pre-pressing surface 52 is mounted through the second mounting seat 51. The prepressing surface 52 comprises a leading-in section 521 and a positioning section 522 which are connected with each other, the leading-in section 521 is located at two ends of the positioning section 522, the leading-in section 521 is in a slope structure, and a height difference exists between the positioning section 522 and the leading-in section 521 to form a groove structure.
The rolling device 42 and the prepressing surface 52 are matched with each other, the rolling device 42 can roll along the prepressing surface 52, so that the turnout girder 1 on the upper part is driven to gradually enter the positioning section 522 along the leading-in section 521 of the prepressing surface 52, the height of the turnout girder 1 is reduced, the prepressing amount reaches h, and the turnout girder 1 becomes a straight state.
It should be pointed out that, according to the work position number of switch girder, corresponding number's second structure 5 can be arranged to the track basis, makes switch girder all can realize the pre-compaction at corresponding work position.
Example 2
As shown in fig. 6, the present embodiment is different from embodiment 1 in that the second structure 5 is fixedly connected below the switch main beam 1, and the first structure 4 is fixedly connected above the track foundations (the forward foundation 2 and the lateral foundation 3).
Example 3
As shown in fig. 7, the present embodiment is different from embodiment 1 in that an elastic connection member 8 is connected between the first mounting seat 41 and the rolling device 42. The elastic connection 8 may be a spring or other elastic element.
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 (7)

1. A passive pre-pressing type magnetic suspension turnout girder vibration suppression structure is characterized by comprising a turnout girder (1) and a passive pre-pressing mechanism, wherein the turnout girder (1) is provided with an upward pre-camber, the passive pre-pressing mechanism comprises a first structure (4) and a second structure (5), the second structure (5) is provided with a pre-pressing amount, the pre-pressing amount is equal to the maximum value of the pre-camber, and the first structure (4) can drive the turnout girder (1) to move along the second structure (5) so that the height of the turnout girder (1) is reduced;
the first structure (4) is fixedly connected with the turnout main beam (1), and the second structure (5) is fixedly connected with a track foundation; or the second structure (5) is fixedly connected with the turnout main beam (1), and the first structure (4) is fixedly connected with a track foundation.
2. The passive pre-pressing type magnetic levitation turnout girder vibration suppression structure according to claim 1, wherein the second structure (5) comprises a pre-pressing surface (52), the pre-pressing surface (52) comprises a lead-in section (521) and a positioning section (522) which are connected with each other, the lead-in section (521) is of a slope structure, a height difference exists between the positioning section (522) and the lead-in section (521), and the maximum value of the height difference between the lead-in section (521) and the positioning section (522) is the pre-pressing amount.
3. The passive pre-stressed type magnetic suspension turnout girder vibration suppression structure according to claim 1, wherein the second structure (5) further comprises a second installation seat (51), the pre-stressed surface (52) is installed through the second installation seat (51), and an elastic connecting piece (8) is connected between the second installation seat (51) and the pre-stressed surface (52).
4. A passive pre-stressed magnetic-levitation turnout girder damping configuration according to any one of claims 2-3, wherein the first structure (4) comprises a rolling device (42), the rolling device (42) being capable of rolling along the pre-stressed surface (52).
5. The passive pre-stressed magnetic levitation turnout girder damping structure according to claim 4, wherein the rolling device (42) comprises a roller or a rolling ball.
6. The passive pre-stressed magnetic levitation turnout girder vibration suppression structure according to claim 4, wherein the first structure (4) further comprises a first mounting seat (41), the rolling device (42) is mounted through the first mounting seat (41), and an elastic connecting piece (8) is connected between the first mounting seat (41) and the rolling device (42).
7. A passive pre-stressed magnetic-levitation turnout girder vibration suppression structure according to any one of claims 1-3, wherein the pre-camber is more than 150% of the vertical deflection of the track girder under the maximum load of the train.
CN202011610402.5A 2020-12-29 2020-12-29 Passive pre-pressing type magnetic suspension turnout girder vibration suppression structure Active CN112746532B (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004015495A1 (en) * 2004-03-26 2005-10-13 Thyssenkrupp Transrapid Gmbh Switch arrangement for magnetic levitation railways and suitable bending beams
KR100885817B1 (en) * 2008-09-10 2009-02-26 매크로드 주식회사 A bearing for monorail
CN105887588A (en) * 2016-06-17 2016-08-24 中铁二院工程集团有限责任公司 Medium-and-low-speed maglev turnout girder vibration suppression structure
CN108301259A (en) * 2018-03-28 2018-07-20 中铁二院工程集团有限责任公司 Front end movable rack rails changing points mechanism
CN108691253A (en) * 2018-03-28 2018-10-23 中铁二院工程集团有限责任公司 A kind of parallel-moving type rack rails switch mechanism

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004015495A1 (en) * 2004-03-26 2005-10-13 Thyssenkrupp Transrapid Gmbh Switch arrangement for magnetic levitation railways and suitable bending beams
KR100885817B1 (en) * 2008-09-10 2009-02-26 매크로드 주식회사 A bearing for monorail
CN105887588A (en) * 2016-06-17 2016-08-24 中铁二院工程集团有限责任公司 Medium-and-low-speed maglev turnout girder vibration suppression structure
CN108301259A (en) * 2018-03-28 2018-07-20 中铁二院工程集团有限责任公司 Front end movable rack rails changing points mechanism
CN108691253A (en) * 2018-03-28 2018-10-23 中铁二院工程集团有限责任公司 A kind of parallel-moving type rack rails switch mechanism

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