CN106738283A - High speed railway fragments-free track slab pre-tensioning system flowing water unit production line - Google Patents
High speed railway fragments-free track slab pre-tensioning system flowing water unit production line Download PDFInfo
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- CN106738283A CN106738283A CN201611120039.2A CN201611120039A CN106738283A CN 106738283 A CN106738283 A CN 106738283A CN 201611120039 A CN201611120039 A CN 201611120039A CN 106738283 A CN106738283 A CN 106738283A
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- flowing water
- water unit
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 45
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 26
- 238000000465 moulding Methods 0.000 claims abstract description 8
- 239000000725 suspension Substances 0.000 claims abstract description 3
- 230000008859 change Effects 0.000 claims description 7
- 238000012423 maintenance Methods 0.000 claims 1
- 230000003068 static effect Effects 0.000 abstract description 3
- 230000007246 mechanism Effects 0.000 description 11
- 238000000034 method Methods 0.000 description 11
- 230000008569 process Effects 0.000 description 7
- 238000007493 shaping process Methods 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 3
- 230000003014 reinforcing effect Effects 0.000 description 3
- 230000001360 synchronised effect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000032258 transport Effects 0.000 description 2
- 230000007306 turnover Effects 0.000 description 2
- 230000002146 bilateral effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 210000003205 muscle Anatomy 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 230000003245 working effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B15/00—General arrangement or layout of plant ; Industrial outlines or plant installations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G35/00—Mechanical conveyors not otherwise provided for
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Carriers, Traveling Bodies, And Overhead Traveling Cranes (AREA)
- Platform Screen Doors And Railroad Systems (AREA)
Abstract
A kind of high speed railway fragments-free track slab pre-tensioning system flowing water unit production line, including order be fixedly installed tensioning station, vibration moulding station, conserve station, put Zhang Gong position and demoulding station, it is provided with the railway plate die that operation is matched with the station, described each station is fixed on earth's surface by holder suspension, matching has the portable transportation trolley for transporting railway plate die and/or track plates, and railway plate die and/or track plates are transported into operation station according to track plates production process.Each fixed station is arranged and suspended and is fixed on earth's surface by the present invention by production sequence, transportation trolley is set, moved along each station medial center line, railway plate die and/or track plates are transported to operation station, static railway plate die and/or track plates are made to be moved along production line by the sequence of operation with the movement of transportation trolley, coordinate ad hoc control system, realize track plates automation, intelligent production.Reduce production cost, it is ensured that product quality, production efficiency is greatly improved.
Description
Technical field
It is specially a kind of to be capable of achieving full-automatic production high ferro the present invention relates to a kind of track board assembly line used for high-speed railway
The high speed railway fragments-free track slab pre-tensioning system flowing water unit production line of fragment-free track slab.
Background technology
The high speed railway fragments-free track slab pre-tensioning system production line of prior art, main processes include reinforced bar stretching, shake
It is dynamic pour into a mould, conserve, putting and some operations such as the demoulding.Current technique mainly employs fixed base, fixed bed die, bilateral mould
（By the way of two sets of side plates of one set of die）, multi-mould once concentrate tensioning, individually steam-cured, independent casting production technology,
Its each single item operation must all be completed on a pedestal, and the production equipment for relating generally to has：Moulds of industrial equipment, tensioning system（Bag
Containing pre- tensioning system）, vibration molding system, track plates logistics system（The lifting of track plates, upset）, tension rod dismounting system
System, curing system and logistics system etc..
The technique following points weak point：
Integrated artistic is less efficient, employment is more, mould utilization rate is relatively low, because being fixed base, all of operation is both needed to
Completed in same pedestal, so the input for wanting to be improved under this technological process percent of automatization is very high.
The stretching process of the technique drives many steel simultaneously using several pedestal simultaneous tension, i.e., one tensioning walking beam
Muscle tensioning, final control be all reinforcing bars total pulling force, so, if any tensioning beam for side occur deform,
The error of error or tensioning oil cylinder displacement synchronous control during pre- tensioning, brings larger mistake can to the stretching force of independent reinforcing bar
Difference, its control accuracy is low, directly affects the quality of production of track plates.Simultaneously also there is certain potential safety hazard in this technique.
The content of the invention
For the deficiency that above-mentioned prior art is present, there is provided a kind of high speed railway fragments-free track slab pre-tensioning system flowing water unit life
Producing line.
A kind of high speed railway fragments-free track slab pre-tensioning system flowing water unit production line, including the tensioning work that order is fixedly installed
Position, vibration moulding station, conserve station, put Zhang Gong position and demoulding station, be provided with the track plates that operation is matched with the station
Mould, it is characterized in that described each station is fixed on earth's surface by holder suspension, matching has transport railway plate die and/or track plates
Portable transportation trolley, the transportation trolley along station central axis is reciprocal or loopy moving, according to track plates production process
Railway plate die and/or track plates are transported to operation station.
Described high speed railway fragments-free track slab pre-tensioning system flowing water unit production line, it is characterized in that under described transportation trolley
Portion is provided with directive wheel, and on each station center line or center line side is provided with gathering sill, and the transportation trolley top sets
It is equipped with least two synchronization lifting oil cylinders.
Described high speed railway fragments-free track slab pre-tensioning system flowing water unit production line, it is characterized in that along each station central axis
Transhipment track is equipped with, described transportation trolley back and forth or is cyclically moved along the transhipment track on transhipment track.
Described high speed railway fragments-free track slab pre-tensioning system flowing water unit production line, it is characterized in that described transhipment track bag
Include at least two longitudinal direction transhipment tracks and the horizontal transhipment track with the longitudinal direction transhipment track vertical connection.
Described high speed railway fragments-free track slab pre-tensioning system flowing water unit production line, it is characterized in that described transhipment track is first
Tail is connected.
Described high speed railway fragments-free track slab pre-tensioning system flowing water unit production line, described transportation trolley walking route two
Side is provided with the positioning support matched with operation station.
Described high speed railway fragments-free track slab pre-tensioning system flowing water unit production line, it is characterized in that in described transportation trolley
Hoist cylinder is provided with, the hoist cylinder top is provided with positioning and guiding groove.
Described high speed railway fragments-free track slab pre-tensioning system flowing water unit production line, it is characterized in that described hoist cylinder is
It is fixed on four synchronization lifting oil cylinders of transportation trolley corner side.
Described high speed railway fragments-free track slab pre-tensioning system flowing water unit production line, it is characterized in that described transportation trolley sets
It is equipped with fixed road wheel system and liftable road wheel system, described fixed road wheel system and liftable road wheel system
Wheel shaft is arranged in a mutually vertical manner.
Described high speed railway fragments-free track slab pre-tensioning system flowing water unit production line, it is characterized in that liftable road wheel system
Including liftable road wheel, the change cylinder of rail being fixed on car body, the rod end of the change cylinder of rail and the wheel of liftable road wheel
Axle sleeve is connected, and the axle end of the liftable road wheel is connected with hydraulic motor.
Advantages and positive effects of the present invention are：Each fixed station is arranged and suspended by production sequence and is fixed on earth's surface,
Transportation trolley is set, is moved along each station medial center line, be transported to railway plate die and/or track plates according to technological requirement
Operation station, makes static railway plate die and/or track plates be moved along production line by the sequence of operation with the movement of transportation trolley
It is dynamic, coordinate ad hoc control system, realize track plates automation, intelligent production.Reduce production cost, it is ensured that product matter
Amount, production efficiency is greatly improved.
Brief description of the drawings
Fig. 1 is production line horizontal layout schematic diagram of the invention；
Fig. 2 is transportation trolley structural representation；
Fig. 3 is to become rail transportation trolley main structure diagram；
Fig. 4 is the schematic top plan view of Fig. 3；
Fig. 5 is to become rail transportation trolley dimensional structure diagram；
Fig. 6 is track plates dolly schematic front view；
Fig. 7 is the top view of Fig. 6；
Fig. 8 is the E-E cut-away views of Fig. 7.
In figure, 1- steel wires enter cage position；2- transportation trolleys；3- pretension stations；4- tensioning stations；5- detects station；6- vibrates
Shaping station；7- the second vibration moulding stations；8- becomes rail transportation trolley；9- secondary stations；10- puts Zhang Gong position；11- positioning branch
Seat；12- demoulding stations；The clear die worker positions of 13-；14- moulds detect station；15- track plates dollies；16- envelope die workers position；17- turnover panels
Station；201- car bodies；202- hoist cylinders；203- location holes；204- road wheels；205- tracks；211- movable motors；212- liquid
Pressure power source；214- becomes rail road wheel；215- becomes cylinder of rail；216- power transmission shafts；217- wheel shafts；303- track board brackets；304-
Cone deviates from mechanism；305- final drive shafts；306- counter drive shafts；309- lead columns；310- sides go out oil cylinder；The upright oil cylinders of 311-；
312- corner oil cylinder brackets；313- corner oil cylinders；314- cone locking devices；315- demoulding cones.
Specific embodiment
Referring to the drawings 1, high speed railway fragments-free track slab pre-tensioning system flowing water unit production line of the invention, mainly including operation
Area and steam-cured area Liang Ge regions.Each operation station is set gradually by process sequence.Each station is passed through by ground fixed support
Foundation bolt is fixed on ground, and the running space for transportation trolley movement is left between its operation position and ground.If Active workings
Length enough, can be arranged in a straight line along a center line according to process sequence by each station.It is provided with moveable transportation trolley 2, institute
Transportation trolley is stated to operate to corresponding station railway plate die and/or track plates by technological requirement or be moved to down by corresponding station
One station.On the inside of each station, the positioning support matched with the station operation height is provided with along transportation trolley track route both sides
11, there is the location hole/groove matched with railway plate die bottom positioner on the positioning support top.
The described bottom of transportation trolley 2 is installed by road wheel.One embodiment is the road wheel directly to walk in ground
Universal wheel, in order to ensure to be accurately positioned, do not occur trend or left-right deviation, along walking route set a gathering sill or guiding
The devices such as cylinder/post.Ad-hoc location installs alignment sensor in gathering sill, and corresponding signal supervisory instrument is installed in transportation trolley,
During work, instruction is sent by control system, manipulation dolly is positive, inversely walking or stopping etc., it is ensured that transportation trolley works.Fortune
Turn dolly top and synchronization lifting oil cylinder is installed, during work, lifted by hoist cylinder and put down railway plate die and/or track
Plate.
An alternative embodiment of the invention employs orbital fashion, i.e., along each station center line laying transhipment track, operating
Dolly transports track travel by rail wheel.Positioning support is arranged on station inner side and transhipment track both sides.
The present invention arranges operation station, i.e., each work in implementation process more commonly under a limited orographic condition
Industry station arrangement is on the same plane but on different straight lines.Therefore, as shown in figure 1, set a plurality of vertical or horizontal track, wherein
Longitudinal and transverse interorbital square crossing, each operation station is set along track.The transhipment track of the longitudinal and transverse setting is in possible condition
Under it is end to end, constitute a complete process cycles.
If condition is limited, transhipment track can not be end to end, then need the equipment beyond transportation trolley by after the demoulding
Railway plate die is transported to initial bit, such as drives a vehicle, ground dolly etc..
Shown in Fig. 1, steel wire was provided with before tensioning station 4 and enters cage position 1 and pretension station 3.Held in the mouth after tensioning station 4
A detection station 5 is connect, reinforcing bar effect and mould situation after detection tensioning.Vibration moulding station 6 is provided with afterwards to be shaken with second
Dynamic shaping station 7, it is other each station meetings for one shaping station molding time of solution is more long to set two vibration moulding stations
The problem of work situation is treated in appearance.It is steam-cured area after shaping station, interior some tracks, the track after shaping is provided with steam-cured
Plate stands certain hour together with railway plate die in steam-cured area.It is sequentially set with after steam-cured area and puts Zhang Gong position 10, stripper
Position 12 and clear die worker position 13, after railway plate die is detected through mould detection station 14, are again introduced into initial steel wire and enter cage position 1.
So far the operation circulation that track plates make is fully completed.
Shown in figure, the track plates after the demoulding carry out envelope mould through sealing die worker position 16, after being overturn subsequently into turnover panel station 17
Into products storage area.
Shown in figure, according to the setting of track board assembly line production station layout and transhipment track, in track plates production line
On have three kinds of different structures transportation trolleys work.One is common transportation trolley 2, as shown in Fig. 2 it is on rectilinear orbit
Reciprocal walking completes work.Second to become rail transportation trolley 8, and it can be in the two of square crossing in length and breadth track crossing up conversions
Trackwork, you can walked with long rails, can also be transferred to cross track walking.3rd is provided with dismountable demoulding cone
The track plates dolly 15 of device, for the demoulding cone on track plates to be pulled out after the demoulding after track plates are transported.
It is common transportation trolley 2 shown in Fig. 2, the transportation trolley includes car body 201, has road wheel 204 in lower car body,
One hoist cylinder 202 is respectively set near four angles of vehicle body upper portion, four hoist cylinder synchronous operations during work, in car body
Hydraulic workstation is provided with for the oil cylinder provides operation power.There are locating slot or location hole 203 and rail in the top of hoist cylinder
The positioner correspondence of guidance tape mold bottom.
It is to become rail transportation trolley structural representation shown in Fig. 3-5, on the basis of common transportation trolley fixes road wheel system
A set of liftable road wheel system is separately set, and the wheel shaft of two systems is orthogonal.
Shown in figure, it is power set that fixed road wheel system uses movable motor 211, by power transmission shaft 216 and wheel shaft
217 drive fixed road wheel 213 to rotate.Liftable road wheel system includes the change cylinder of rail 215 being fixed with car body 212, should
The rod end of change cylinder of rail is fixed on liftable road wheel and becomes in the axle sleeve of rail road wheel 214.When fixed road wheel works,
Become the static retracted state of cylinder of rail piston rod.Transportation trolley runs to two cross-point locations of track, it is necessary to when turning to, become rail
Cylinder efficient, piston rod stretches out, and will become rail road wheel 214 and be pushed out to downwards on intersecting track while fixed road wheel is raised to
Depart from original track.
The power set of above-mentioned change rail road wheel can be used and fix the same motor power of road wheel, but due to transmission
System complex, therefore a set of drive device is separately set.Become in car body side and fix a hydraulic motor near rail road wheel.To become
Rail road wheel axle end is connected with hydraulic motor output end.Hydraulic power supply 212 passes through oil circuit and each hydraulic means phase on car body
Even, for it provides operation power.
Fig. 6-8 is a kind of track plates dolly 15 of dismountable demoulding cone, on the axis of car body 201 of the track plates dolly
Three cone abjection mechanisms 304 are provided with, three design holes of position and track plates of cone abjection mechanism are corresponding.Described three
Cone abjection mechanism can use fixed form.Also can be using being movably mounted on car body, centering is fixed again when using.This reality
The conical inner body abjection mechanism for applying example is fixed on car body center, and the cone abjection mechanism of its both sides uses movably to be pacified
Dress, is that can reduce car body total length using this removable frame, convenient to run and operation.Wherein it is in the cone of center
Body abjection mechanism includes being fixed on the upright oil cylinder 311 of lower car body, and a corner oil cylinder is fixed with the rod end of upright oil cylinder
Bracket 312, corner oil cylinder 313 is arranged on the bracket, and a cone locking device 314 is arranged in corner oil cylinder.Both sides can
The upright oil cylinder bottom of mobile cone abjection mechanism is arranged on a movable stand, the side of the movable stand, car body central axis
On a side be installed oil cylinder 310, the rod end that the side goes out oil cylinder is connected with movable stand.Go out oil cylinder side in above-mentioned side to also set up
There is a lead column 309.
Shown in figure, vehicle body upper portion is provided with a track board bracket 303, it is ensured that track plates are received when demoulding cone is removed
Power is uniform, and the track board bracket may be provided on the synchronous fuel tank of corner.
Be also equipped with being provided for car body workpiece the hydraulic power supply of power in vehicle body, hydraulic motor output shaft with
Final drive shaft 305 is connected, and final drive shaft is engaged by gear or chain, sprocket wheel mating connection counter drive shaft 306 drive road wheel
204 rotate.
The course of work is as follows, places it in the track plate support on dolly top after demolding of track slab by hoist cylinder 202
On frame 303.Detent mechanism is installed on vehicle frame, the demoulding cone 315 and cone for making track plates center deviate from mechanism 304
Centering.The fuel-displaced cylinder 310 in two sides stretches out along lead column 309, makes both sides moveable cone abjection mechanism and corresponding demoulding cone
Centering.Three upright oil cylinders 311 stretch out, and described locking device 314 are pushed in the cavity of demoulding cone 315, locking device 314
It is rectangle rigid body workpiece, its shape size is matched with demoulding cone cavity.The rotation of corner oil cylinder 313 rotates locking device 314
90 ° are locked with demoulding cone 315, and upright oil cylinder 311 declines and produces drawing to act on, and locking device 314 is driven demoulding cone
315 pull out from track plate body, track plates dolly carrier rails plate to next station.
Claims (10)
1. a kind of high speed railway fragments-free track slab pre-tensioning system flowing water unit production line, including order be fixedly installed tensioning station,
Vibration moulding station, maintenance area/station, put Zhang Gong position and demoulding station, be provided with the track plates that operation is matched with the station
Mould, it is characterized in that described each station is fixed on earth's surface by holder suspension, matching has transport railway plate die and/or track plates
Portable transportation trolley, the transportation trolley along station central axis is reciprocal or loopy moving, according to track plates production process
Railway plate die and/or track plates are transported to operation station.
2. high speed railway fragments-free track slab pre-tensioning system flowing water unit production line according to claim 1, it is characterized in that described
Transportation trolley bottom be provided with directive wheel, on each station center line or center line side is provided with gathering sill, the fortune
Turn dolly top and be provided with least two synchronization lifting oil cylinders.
3. high speed railway fragments-free track slab pre-tensioning system flowing water unit production line according to claim 1, it is characterized in that along each
Station central axis is equipped with transhipment track, and described transportation trolley is reciprocal along the transhipment track or is cyclically transporting track
Upper movement.
4. high speed railway fragments-free track slab pre-tensioning system flowing water unit production line according to claim 3, it is characterized in that described
Transhipment track include at least two longitudinal direction transhipment tracks and the horizontal transhipment track with the longitudinal direction transhipment track vertical connection.
5. the high speed railway fragments-free track slab pre-tensioning system flowing water unit production according to any claim in claim 1-4
Line, the transhipment track that its feature is stated joins end to end.
6. the high speed railway fragments-free track slab pre-tensioning system flowing water unit life according to any claim in claim 2 to 5
Producing line, described transportation trolley walking route both sides are provided with the positioning support matched with operation station.
7. high speed railway fragments-free track slab pre-tensioning system flowing water unit production line according to claim 6, it is characterized in that described
Transportation trolley on be provided with hoist cylinder, the hoist cylinder top is provided with positioning and guiding groove.
8. high speed railway fragments-free track slab pre-tensioning system flowing water unit production line according to claim 7, it is characterized in that described
Hoist cylinder be four synchronization lifting oil cylinders for being fixed on transportation trolley corner side.
9. the high speed railway fragments-free track slab pre-tensioning system flowing water unit production line according to claim 7 or 8, it is characterized in that institute
The transportation trolley stated is provided with fixed road wheel system and liftable road wheel system, described fixed road wheel system with can rise
The wheel shaft for dropping road wheel system is arranged in a mutually vertical manner.
10. high speed railway fragments-free track slab pre-tensioning system flowing water unit production line according to claim 8, it is characterized in that can rise
Drop road wheel system includes liftable road wheel, the change cylinder of rail being fixed on car body, the rod end of the change cylinder of rail with can rise
The axle sleeve for dropping road wheel is connected, and the axle end of the liftable road wheel is connected with hydraulic motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611120039.2A CN106738283B (en) | 2016-12-08 | 2016-12-08 | High speed railway fragments-free track slab pre-tensioning system flowing water unit production line |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611120039.2A CN106738283B (en) | 2016-12-08 | 2016-12-08 | High speed railway fragments-free track slab pre-tensioning system flowing water unit production line |
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| Publication Number | Publication Date |
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| CN106738283A true CN106738283A (en) | 2017-05-31 |
| CN106738283B CN106738283B (en) | 2018-05-18 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107225671A (en) * | 2017-07-20 | 2017-10-03 | 山西高行液压股份有限公司 | Pre-tensioning system produces the flexible flow production line of fragment-free track slab |
| CN108274607A (en) * | 2018-03-10 | 2018-07-13 | 山东高速轨道设备材料有限公司 | A kind of pre-stress rail plate continuous production complete set of equipments |
| CN111186012A (en) * | 2020-01-17 | 2020-05-22 | 中铁三局集团有限公司 | Automatic production line for railway track slabs |
| CN111977297A (en) * | 2019-05-21 | 2020-11-24 | 捷普电子(新加坡)公司 | Conveying device |
| CN113043449A (en) * | 2021-04-29 | 2021-06-29 | 中铁二局集团有限公司 | Subway track plate prefabrication production line and construction method |
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|---|---|---|---|---|
| CN107225671A (en) * | 2017-07-20 | 2017-10-03 | 山西高行液压股份有限公司 | Pre-tensioning system produces the flexible flow production line of fragment-free track slab |
| CN108274607A (en) * | 2018-03-10 | 2018-07-13 | 山东高速轨道设备材料有限公司 | A kind of pre-stress rail plate continuous production complete set of equipments |
| CN108274607B (en) * | 2018-03-10 | 2022-03-04 | 山东高速铁建装备有限公司 | Continuous production complete equipment for prestressed track slab |
| CN111977297A (en) * | 2019-05-21 | 2020-11-24 | 捷普电子(新加坡)公司 | Conveying device |
| CN111977297B (en) * | 2019-05-21 | 2021-12-14 | 捷普电子(新加坡)公司 | Conveying device |
| CN111186012A (en) * | 2020-01-17 | 2020-05-22 | 中铁三局集团有限公司 | Automatic production line for railway track slabs |
| CN113043449A (en) * | 2021-04-29 | 2021-06-29 | 中铁二局集团有限公司 | Subway track plate prefabrication production line and construction method |
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| CN106738283B (en) | 2018-05-18 |
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