CN111719361B - A frame level (l) ing mechanism for sleeper mills processing of grinding - Google Patents
A frame level (l) ing mechanism for sleeper mills processing of grinding Download PDFInfo
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- CN111719361B CN111719361B CN202010661113.1A CN202010661113A CN111719361B CN 111719361 B CN111719361 B CN 111719361B CN 202010661113 A CN202010661113 A CN 202010661113A CN 111719361 B CN111719361 B CN 111719361B
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- die head
- jacking
- rack
- main body
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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
- E01B31/00—Working rails, sleepers, baseplates, or the like, in or on the line; Machines, tools, or auxiliary devices specially designed therefor
- E01B31/20—Working or treating non-metal sleepers in or on the line, e.g. marking, creosoting
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- Machines For Laying And Maintaining Railways (AREA)
Abstract
The invention discloses a rack horizontal adjusting mechanism for milling and grinding of sleepers, which comprises a rack main body and a plurality of groups of jacking clamping jaw sets arranged along the front-back direction of the rack main body, wherein each jacking clamping jaw set comprises two jacking clamping jaws symmetrically arranged on the left side and the right side of the rack main body, each jacking clamping jaw comprises a die head and a jacking driving device, each jacking driving device is arranged on the rack main body, the power output end of each jacking driving device is connected with the die head and drives the die head to vertically move up and down, a fixing groove is arranged below each die head, and the fixing groove is connected with a sleeper in a matched mode. After the structure is adopted, compared with the prior art, the height of the machine frame main body can be adjusted, so that the machine frame main body is adjusted to the horizontal position on an arched railway foundation, a tool bit on the machine frame main body can conveniently mill and grind the sleeper in the horizontal direction, and the milling and grinding precision is improved.
Description
Technical Field
The invention relates to the technical field of sleeper milling and grinding, in particular to a rack horizontal adjusting mechanism for sleeper milling and grinding.
Background
The sleeper is one of railway fittings and mainly used for supporting a steel rail, maintaining the position of the steel rail and transmitting the huge pressure transmitted by the steel rail to a track bed. Among the existing railway tracks, especially high track way is mostly ballastless track, and the ride comfort is good, and stability is high. The sleeper on the ballastless track is made of reinforced concrete materials, and has higher stability and longer service life.
In practical situations, the geology is arched upwards due to stress changes, and the railway track is subjected to an uparching disease. As shown in fig. 2, the plane S is set to be a horizontal base surface, the railway foundation 1 'is arched upward, the upper surface of the railway foundation 1' is inclined with respect to the horizontal base surface, and the profile surface section 3 'of the sleeper 2' on the railway foundation 1 'is inclined with respect to the horizontal base surface, so that the rail 4' is inclined with respect to the horizontal base surface, and thus a height difference occurs.
Since railway tracks are sensitive to track reference heights, the horizontal height difference per kilometer needs to be controlled within 2 mm. Thus, small changes in the geological structure, which accumulate over time, easily exceed this limit height difference. This variation is even more pronounced, particularly in long tunnels. As long as the height difference exceeds the limit, the running speed of the high-speed rail needs to be reduced, and the running efficiency and the running safety are greatly influenced. In order to solve the problems, in the prior art, the profile surface of the sleeper is milled and ground by using milling and grinding equipment, in the milling and grinding process of the sleeper, a rack of the milling and grinding equipment needs to be kept parallel to a horizontal base surface, a cutter head can only mill and grind the sleeper in the horizontal direction, and the section of the milled profile surface is made parallel to the horizontal base surface, so that the steel rail is horizontally laid, the height difference of the steel rail in the front and at the back is reduced, and the phenomenon of upwarp of the railway track is prevented.
In view of the above, the applicant has made an intensive study to solve the above problems and has made the present invention.
Disclosure of Invention
The invention mainly aims to provide a horizontal adjusting mechanism of a rack for milling and grinding sleepers, which can adjust the height of a rack main body to enable the rack main body to be adjusted to a horizontal position on an arched railway foundation, is convenient for a cutter head on the rack main body to mill and grind the sleepers in the horizontal direction and improves the milling and grinding precision.
In order to achieve the above purpose, the solution of the invention is:
the utility model provides a frame horizontal adjustment mechanism for sleeper mills processing of grinding, includes the frame main part, wherein, still includes the jacking clamping jaw group that the fore-and-aft direction of frame main part set up, each jacking clamping jaw group includes that two symmetries set up the jacking clamping jaw in the frame main part left and right sides, the jacking clamping jaw includes die head and jacking drive arrangement, jacking drive arrangement establishes in the frame main part, jacking drive arrangement's power take off end with vertical elevating movement is connected and drive die head to the die head, the below of die head is equipped with the fixed slot, the fixed slot is connected with the sleeper cooperation.
Furthermore, the power output end of the jacking driving device is rotatably connected with the die head.
Furthermore, the jacking clamping jaw further comprises a die head rotating shaft and an adapter, the upper end of the adapter is connected with the power output end of the jacking driving device, the lower end of the adapter is provided with a through hole, and the die head rotating shaft penetrates through the through hole and is rotatably connected with the adapter; the upper surface of die head is equipped with the mounting groove, be equipped with the connecting hole that runs through the die head setting on the lateral wall of the left and right sides of mounting groove, the both ends of die head axis of rotation are connected with the connecting hole rotation respectively.
The die head further comprises a die head fixing block which is connected in the mounting groove in an embedded mode, and the lower surface of the die head fixing block is provided with an upper matching groove for enabling a die head rotating shaft to be matched in an embedded mode and an abdicating hole for enabling the adaptor to penetrate through; the tank bottom of mounting groove is equipped with the lower cooperation groove that supplies die head axis of rotation embedding complex to and the groove of stepping down that supplies the adaptor embedding.
The jacking clamping jaw further comprises a connecting block and a die head guide post, the connecting block is connected below the rack main body, and the connecting block is provided with a first guide through hole which is vertically arranged in a penetrating manner and second guide through holes which are arranged on the left side and the right side of the first guide through hole and are symmetrically arranged relative to the first guide through hole; the power output end of the jacking driving device penetrates through the first guide through hole, the upper end of the die head guide post extends into the second guide through hole to be connected in a sliding mode, and the lower end of the die head guide post is connected with the die head in a rotating mode.
Further, jacking drive arrangement includes jacking servo motor, jacking lead screw and jacking screw-nut, jacking servo motor's output shaft is connected with the jacking lead screw, jacking screw-nut wears to establish in the first direction through-hole.
Furthermore, the fixed slot has first arcwall face and the second arcwall face with the laminating of sleeper upper surface, first arcwall face is established in the die head and is close to the inboard one end of frame main part to first arcwall face extends and upwards arches gradually by the die head outside to die head middle part direction, the one end that the die head is close to the frame main part outside is established to the second arcwall face, the second arcwall face extends and upwards arches gradually by the die head outside to die head middle part direction.
Furthermore, one end, close to the inner side of the frame body, below the die head is provided with a horizontal binding surface, and the horizontal binding surface is connected with the first arc-shaped surface.
Further, including two sets of jacking clamping jaw group, the frame main part is including establishing the first rack pole at frame main part front end to and establish at frame main part rear end second rack pole, connect a set of jacking clamping jaw group on first rack pole and the second rack pole respectively.
By adopting the structure, the invention is provided with the jacking clamping jaw groups which are correspondingly arranged front and back, and each jacking clamping jaw group comprises two jacking clamping jaws which are symmetrically arranged at the left side and the right side of the frame body. Firstly, the jacking clamping jaw is mutually clamped and fixed with the sleeper through the die head, so that the front and back directions of the frame body are adjusted to be parallel to the extending direction of the rail. Then, the vertical height of each part of the rack main body is adjusted by driving each jacking driving device, and the rack main body is adjusted to be parallel to the reference horizontal plane.
Compared with the prior art, the automatic adjusting device has the advantages that the automatic adjusting device can automatically adjust the height distance between the rack main body and the sleeper, and adjust the rack main body to the horizontal position on the railway foundation of the upper arch, so that the operation is convenient and fast; meanwhile, the tool bit on the machine frame main body can conveniently mill and grind the sleeper in the horizontal direction, and the milling and grinding precision is improved.
Drawings
Fig. 1 is a perspective view of the external structure of the present invention.
Fig. 2 is a simple schematic view of a track structure when a railway track is arched upwards.
Fig. 3 is a simple schematic diagram of the present invention.
Fig. 4 is a perspective view of the external structure of the jacking clamping jaw.
Fig. 5 is a sectional view of the external structure of the jacking clamping jaw.
In the figure:
a frame main body-1; a first rack bar-11; a second frame bar-12; jacking clamping jaw-2;
die-21; a fixed groove-211; a first arcuate face-212; a second arcuate surface-213;
a horizontal abutment surface-214; a jacking driving device-22; a jacking servo motor-221;
a jacking screw rod-222; jacking screw nut-223; die head rotating shaft-23; an adaptor-24;
mounting groove-25; a connecting hole-251; a lower mating groove-252; a abdicating groove-253;
die head fixing block-26; upper mating groove-261; a relief hole-262; a connecting block-27;
a first guide through-hole-271; a second guide through-hole-272; die guide post-28;
a sleeper-91; tie base-92.
Detailed Description
In order to further explain the technical solution of the present invention, the present invention is explained in detail by the following specific examples.
As shown in fig. 1-5, a frame horizontal adjustment mechanism for sleeper milling process, including frame main part 1, wherein, still include the jacking clamping jaw group that the fore-and-aft direction of frame main part 1 set up, each jacking clamping jaw group includes that two symmetries set up the jacking clamping jaw 2 in the frame main part 1 left and right sides, jacking clamping jaw 2 includes die head 21 and jacking drive arrangement 22, jacking drive arrangement 22 establishes on frame main part 1, jacking drive arrangement 22's power take off end with die head 21 is connected and is driven die head 21 and do vertical elevating movement, the below of die head 21 is equipped with fixed slot 211, fixed slot 211 is connected with sleeper 91 cooperation.
After the structure is adopted, as shown in fig. 3, S in the figure represents a reference horizontal plane, if the rail has an upwarp defect, the ground is stressed and drives the sleeper 91 to upwarp together, so that the rack body 1 fixed with the sleeper 91 and the horizontal reference plane are inclined mutually, the invention is provided with jacking clamping jaw sets which are correspondingly arranged in front and back, and each jacking clamping jaw set comprises two jacking clamping jaws 2 which are symmetrically arranged at the left side and the right side of the rack body 1. First, the lift-up driving device 22 drives the die head 21 to descend, so that the fixing groove 211 of the die head 21 and the sleeper 91 are fixed to each other in a locked manner, and the front-back direction of the rack body 1 is adjusted to be parallel to the extending direction of the rail. Then, the vertical height of each part of the rack body 1 is adjusted by driving each jacking driving device 22, and the rack body 1 is adjusted to be parallel to the reference horizontal plane.
Compared with the prior art, the automatic adjusting device has the advantages that the automatic adjusting device can automatically adjust the height distance between the rack main body 1 and the sleeper 91, and adjust the rack main body 1 to the horizontal position on the railway foundation of the upper arch, so that the operation is convenient and fast; meanwhile, the milling and grinding of the sleeper 91 in the horizontal direction by the cutter head on the rack main body 1 are facilitated, and the milling and grinding precision is improved.
Preferably, when the frame body 1 is adjusted to be parallel to the horizontal reference surface, the jacking driving device 22 is adjusted randomly along with the frame body 1 to generate a position, and the die head 21 and the sleeper 91 are fixed and do not move, so that an angle between the output end of the jacking driving device 22 and the connection part of the die head 21 is changed, and therefore, the power output end of the jacking driving device 22 is required to be rotatably connected with the die head 21, and the connection part of the jacking driving device 22 and the die head 21 is prevented from being disconnected due to the angle change.
Preferably, in this embodiment, in order to enable the die head 21 to be rotatably connected with the output end of the jacking driving device 22, the jacking clamping jaw 2 further includes a die head rotating shaft 23 and an adaptor 24, the upper end of the adaptor 24 is connected with the power output end of the jacking driving device 22, the lower end of the adaptor 24 is provided with a through hole, and the die head rotating shaft 23 is inserted into the through hole and rotatably connected with the adaptor 24; the upper surface of the die head 21 is provided with a mounting groove 25, the side walls of the left and right sides of the mounting groove 25 are provided with connecting holes 251 penetrating through the die head 21, and both ends of the die head rotating shaft 23 are rotatably connected with the connecting holes 251 respectively. After the structure is adopted, in the process of adjusting the frame main body 1, the die head 21 can rotate around the die head rotating shaft 23 by taking the axis of the die head rotating shaft 23 as the center of a circle.
Preferably, in order to further fix the die rotating shaft 23, the die 21 further comprises a die fixing block 26 which is connected in the mounting groove 25 in a fitting manner, and the lower surface of the die fixing block 26 is provided with an upper fitting groove 261 for fitting and matching the die rotating shaft 23 and an abdicating hole 262 for passing the adaptor 24; the bottom of the mounting groove 25 is provided with a lower fitting groove 252 into which the die rotation shaft 23 is fitted, and an escape groove 253 into which the adaptor 24 is fitted.
Preferably, the jacking clamping jaw 2 further comprises a connecting block 27 and a die head guide column 28, the connecting block 27 is connected below the frame body 1, the connecting block 27 is provided with a first guide through hole 271 vertically penetrating through, and second guide through holes 272 arranged on the left and right sides of the first guide through hole 271 and symmetrically arranged relative to the first guide through hole 271; the power output end of the jacking driving device 22 penetrates through the first guide through hole 271, the upper end of the die head guide column 28 extends into the second guide through hole 272 to be connected in a sliding mode, and the lower end of the die head guide column 28 is connected with the die head 21 in a rotating mode. Specifically, the lower end of the die head guide column 28 is also provided with the adapter 24, and the adapter 24 is rotatably connected with the die head rotating shaft 23, so that the die head guide column 28 and the die head 21 can rotate relatively. By adopting the structure, the die head 21 is more firmly installed and is guided by the die head guide post 28, so that the die head 21 is more stable and smooth in the ascending and descending processes, and the die head 21 can be prevented from deflecting in the left and right directions.
Preferably, the jacking driving device 22 includes a jacking servo motor 221, a jacking screw 222 and a jacking screw nut 223, the jacking servo motor 221 is vertically disposed on the frame body 1, an output shaft of the jacking servo motor 221 is connected with the jacking screw 222, and the jacking screw nut 223 is fixed in the first guiding through hole 271 in a penetrating manner. After adopting above-mentioned structure, jacking servo motor 221 drives jacking lead screw 222 and rotates relative to jacking lead screw nut 223 to drive die head 21 of jacking lead screw 222 lower extreme and rise or descend, and adopt motor drive, small, light in weight has higher transmission efficiency.
Preferably, because the upper surface of the left and right sides of sleeper 91 is the arcwall face, in order to make fixed slot 211 and sleeper 91 cooperate and more closely laminate, fixed slot 211 has first arcwall face 212 and second arcwall face 213 with the upper surface laminating of sleeper 91, first arcwall face 212 is established in the one end that die head 21 is close to frame main part 1 inboard, and first arcwall face 212 extends and upwards arches gradually to die head 21 middle part direction by the die head 21 outside, the one end that die head 21 is close to frame main part 1 outside is established to second arcwall face 213, second arcwall face 213 extends and upwards arches gradually to die head 21 middle part direction by the die head 21 outside. When the track is the curved track, frame main part 1 front end is owing to the skew of orbital crooked direction slope, lead to frame main part 1 to go up the fixed slot 211 of the jacking clamping jaw 2 of front end and can't paste the cooperation tightly with the upper surface of sleeper 91 completely, can only rely on the frictional force that first arcwall face 212 and second arcwall face 213 and the local binding face production between the sleeper 91 upper surface, make and fix between jacking clamping jaw 2 and the sleeper 91, and first arcwall face 212 and second arcwall face 213 still have the effect of following the trend direction, make things convenient for fixed slot 211 to slide down and sleeper 91 nestification.
Preferably, sleeper base 92 is still equipped with in the below of sleeper 91, the one end that the die head 21 below is close to frame body 1 inboard is equipped with horizontal binding face 214, horizontal binding face 214 is connected with first arcwall face 212, when fixed slot 211 and sleeper 91 fixed fit, horizontal binding face 214 and sleeper base 92's upper surface laminating, improve fixed slot 211 and sleeper 91's degree of cooperation, horizontal binding face 214 can produce frictional force with sleeper base 92's upper surface simultaneously, thereby prevent die head 21 and deflect, make die head 21 and sleeper 91 cooperation more firm.
Preferably, in this embodiment, the present invention is provided with two sets of jacking jaw sets, the rack body 1 includes a first rack bar 11 disposed at the front end of the rack body 1, and a second rack bar 12 disposed at the rear end of the rack body 1, and the first rack bar 11 and the second rack bar 12 are respectively connected to one set of jacking jaw set. The height of the front end of the rack body 1 is adjusted by the jacking clamping jaw group on the first rack rod 11, and the height of the rear end of the rack body 1 is adjusted by the jacking clamping jaw group on the second rack rod 12.
The above embodiments and drawings are not intended to limit the form and style of the present invention, and any suitable changes or modifications thereof by those skilled in the art should be considered as not departing from the scope of the present invention.
Claims (6)
1. A rack horizontal adjusting mechanism for milling and grinding of sleepers comprises a rack main body and is characterized by further comprising a plurality of jacking clamping jaw groups arranged along the front-back direction of the rack main body, each jacking clamping jaw group comprises two jacking clamping jaws symmetrically arranged on the left side and the right side of the rack main body, each jacking clamping jaw comprises a die head and a jacking driving device, each jacking driving device is arranged on the rack main body, the power output end of each jacking driving device is connected with the die head and drives the die head to vertically move up and down, a fixing groove is arranged below each die head, and the fixing groove is connected with a sleeper in a matched mode;
the fixing groove is provided with a first arc-shaped surface and a second arc-shaped surface, the first arc-shaped surface is attached to the upper surface of the sleeper, the first arc-shaped surface is arranged at one end, close to the inner side of the frame main body, of the die head, the first arc-shaped surface extends from the outer side of the die head to the middle direction of the die head and gradually arches upwards, the second arc-shaped surface is arranged at one end, close to the outer side of the frame main body, of the die head, the second arc-shaped surface extends from the outer side of the die head to the middle direction of the die head and gradually arches upwards; and the power output end of the jacking driving device is rotatably connected with the die head.
2. The rack horizontal adjusting mechanism for milling and grinding sleepers as claimed in claim 1, wherein the jacking clamping jaw further comprises a die head rotating shaft and an adapter, the upper end of the adapter is connected with the power output end of the jacking driving device, the lower end of the adapter is provided with a through hole, the die head rotating shaft is arranged in the through hole in a penetrating manner and is rotatably connected with the adapter; the upper surface of die head is equipped with the mounting groove, be equipped with the connecting hole that runs through the die head setting on the lateral wall of the left and right sides of mounting groove, the both ends of die head axis of rotation are connected with the connecting hole rotation respectively.
3. The rack horizontal adjusting mechanism for sleeper milling and grinding as claimed in claim 2, wherein the die head further comprises a die head fixing block which is connected in the mounting groove in an embedded manner, the lower surface of the die head fixing block is provided with an upper matching groove for the die head rotating shaft to be matched in an embedded manner, and a abdicating hole for the adaptor to pass through; the tank bottom of mounting groove is equipped with the lower cooperation groove that supplies die head axis of rotation embedding complex to and the groove of stepping down that supplies the adaptor embedding.
4. The rack horizontal adjusting mechanism for milling and grinding sleepers as claimed in claim 1, wherein the jacking clamping jaw further comprises a connecting block and a die head guide post, the connecting block is connected below the rack body, the connecting block is provided with a first guide through hole which vertically penetrates through the connecting block, and second guide through holes which are arranged on the left side and the right side of the first guide through hole and are symmetrically arranged relative to the first guide through hole; the power output end of the jacking driving device penetrates through the first guide through hole, the upper end of the die head guide post extends into the second guide through hole to be connected in a sliding mode, and the lower end of the die head guide post is connected with the die head in a rotating mode.
5. The rack horizontal adjusting mechanism for milling and grinding of sleepers as claimed in claim 4, wherein the jacking driving device comprises a jacking servo motor, a jacking screw rod and a jacking screw nut, an output shaft of the jacking servo motor is connected with the jacking screw rod, and the jacking screw nut is inserted into the first guide through hole.
6. The rack horizontal adjusting mechanism for sleeper milling processing as claimed in claim 1, comprising two sets of jacking clamping jaw sets, wherein the rack body comprises a first rack rod arranged at the front end of the rack body and a second rack rod arranged at the rear end of the rack body, and the first rack rod and the second rack rod are respectively connected with one set of jacking clamping jaw set.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010661113.1A CN111719361B (en) | 2020-07-10 | 2020-07-10 | A frame level (l) ing mechanism for sleeper mills processing of grinding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010661113.1A CN111719361B (en) | 2020-07-10 | 2020-07-10 | A frame level (l) ing mechanism for sleeper mills processing of grinding |
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| Publication Number | Publication Date |
|---|---|
| CN111719361A CN111719361A (en) | 2020-09-29 |
| CN111719361B true CN111719361B (en) | 2022-02-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010661113.1A Active CN111719361B (en) | 2020-07-10 | 2020-07-10 | A frame level (l) ing mechanism for sleeper mills processing of grinding |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH364281A (en) * | 1960-10-17 | 1962-09-15 | Matisa Materiel Ind Sa | Installation for leveling and wedging railway tracks |
| CN201339155Y (en) * | 2008-12-30 | 2009-11-04 | 中铁十七局集团有限公司 | Concrete surface trimming machine among rail bearings |
| CN201891052U (en) * | 2010-12-14 | 2011-07-06 | 株洲长远铁路建机股份有限公司 | Sleeper laying device for railway line track laying host |
| CN102817292A (en) * | 2011-05-19 | 2012-12-12 | 中铁二局股份有限公司 | Shoulder-free sleeper polisher |
| EP3112534A1 (en) * | 2014-02-21 | 2017-01-04 | Ferrovial Agromán S.A. | Device for positioning and squaring railway sleepers and machine comprising this device |
| CN108049266A (en) * | 2017-12-13 | 2018-05-18 | 株洲时代电子技术有限公司 | A kind of railway changes pillow device and its operational method |
| CN208711764U (en) * | 2018-05-24 | 2019-04-09 | 东北林业大学 | A kind of automatic leveling experiment porch |
| CN210712392U (en) * | 2019-08-16 | 2020-06-09 | 中国铁路总公司 | Quick fine tuning device of ballastless track board |
-
2020
- 2020-07-10 CN CN202010661113.1A patent/CN111719361B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH364281A (en) * | 1960-10-17 | 1962-09-15 | Matisa Materiel Ind Sa | Installation for leveling and wedging railway tracks |
| DE1216340B (en) * | 1960-10-17 | 1966-05-12 | Matisa Materiel Ind Sa | Device for progressing in the direction of the track, in sections, aligning the height of a track |
| CN201339155Y (en) * | 2008-12-30 | 2009-11-04 | 中铁十七局集团有限公司 | Concrete surface trimming machine among rail bearings |
| CN201891052U (en) * | 2010-12-14 | 2011-07-06 | 株洲长远铁路建机股份有限公司 | Sleeper laying device for railway line track laying host |
| CN102817292A (en) * | 2011-05-19 | 2012-12-12 | 中铁二局股份有限公司 | Shoulder-free sleeper polisher |
| EP3112534A1 (en) * | 2014-02-21 | 2017-01-04 | Ferrovial Agromán S.A. | Device for positioning and squaring railway sleepers and machine comprising this device |
| CN108049266A (en) * | 2017-12-13 | 2018-05-18 | 株洲时代电子技术有限公司 | A kind of railway changes pillow device and its operational method |
| CN208711764U (en) * | 2018-05-24 | 2019-04-09 | 东北林业大学 | A kind of automatic leveling experiment porch |
| CN210712392U (en) * | 2019-08-16 | 2020-06-09 | 中国铁路总公司 | Quick fine tuning device of ballastless track board |
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