CN204251656U - Rail postwelding pressurize normalizing device - Google Patents
Rail postwelding pressurize normalizing device Download PDFInfo
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- CN204251656U CN204251656U CN201420622656.2U CN201420622656U CN204251656U CN 204251656 U CN204251656 U CN 204251656U CN 201420622656 U CN201420622656 U CN 201420622656U CN 204251656 U CN204251656 U CN 204251656U
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Abstract
The utility model discloses a kind of rail postwelding pressurize normalizing device, comprise generating set, intermediate frequency power supply, electric control system and hydraulic power unit, wherein generating set connects intermediate frequency power supply, described rail postwelding pressurize normalizing device also comprises: tackling system, described tackling system is arranged on one end of rail postwelding pressurize normalizing device, and tackling system is connected with hydraulic power unit; With normalizing main frame, described normalizing main frame is arranged on the end of tackling system, and normalizing main frame is connected with hydraulic power unit with intermediate frequency power supply.Rail postwelding pressurize normalizing device provided by the utility model can carry out pressurize to rail in heat treatment process, has the features such as heating efficiency is strong, efficiency is high, section temperature is even simultaneously.
Description
Technical field
The utility model relates to steel rail weld joint postweld heat treatment field, particularly relates to a kind of rail postwelding pressurize normalizing device.
Background technology
At present on the occasion of China's track traffic fast-developing period, along with the development of railway technology and improving constantly of train operation speed, also more and more higher to the requirement of rail gapless track welding joint mechanical property, only in this way could ensure the security of train operation.Steel rail weld joint equipment for Heating Processing due to railway construction working-yard is easy artificial flame heating and hand-operated temperature-measuring mode, cannot in heat treatment process for operator offer precise data, pressurize and control device, make operating process very inconvenient, affect again finished heat treatment quality, so can accurately must measure in heat treatment process, pressurize and control, the quality of steel rail weld joint could be ensured.
The steel rail weld joint equipment for Heating Processing that present domestic railway construction working-yard is commonly used mostly is normal pneumatic weldering well heater, and its structure as shown in Figure 1.Described steel rail weld joint equipment for Heating Processing chief component comprises well heater 101, tracheae (oxygen, acetylene) 102, water pipe 103, heater support 104, sliding machine 105 and swing handle 106 6 part, in addition the also material and facility such as aerobic gas, acetylene, oxygenmeter, Acetylene gauge, mixing tank, under meter, water pump, water tank and hand-held temperature measurer.This equipment for Heating Processing main operational principle is that manual operation realizes well heater carry, contraposition, igniting, adjustments of gas proportioning and flow, by the oxygen acetylene flame in well heater, steel rail weld joint surface is heated, utilize swing handle to draw, push away sliding machine, well heater flame is swung along in the axial certain limit of rail, and utilize hand-held temperature measurer butt junction surface to carry out thermometric, then by thermal conduction, the temperature of joint inside is raised in the scope of processing requirement.
The heat treatment mode of the equipment for Heating Processing shown in Fig. 1 has following weak point: 1, equipment does not stretch rail device, cannot carry out pressurize in process of production, make joint easily under the effect of Railroad's Temperature Stress, produce deformation and damage to rail; 2, because rail belongs to profiled-cross-section section bar, each several part sectional area is very uneven, therefore must according to the heated condition adjustment well heater fire hole size at each position when flame heats, thus regulate the heated condition in each region, very easily cause region to heat uneven or heart portion, position, part large section and cannot reach Heating temperature, occur the situation of " just not saturating "; 3, in on-the-spot flame normalizing process, temperature control carries out thermometric mainly through photoelectric thermoscope or infrared thermometer or whether comparison is carried out heat-up time in scope, due to the impact by flame, temperature-measuring results compares fluctuation with actual value very large, effectively cannot control heats; 4, the oxygen of each batch of various places and the purity of acetylene and pressure all variant, after carrying out the normalizing of some joints, gas cylinder also cannot provide the gas of stability of flow sometimes, when particularly constructing in the wild, the lower stability that also can affect gas of temperature, effectively cannot control heats equally; 5, due to field working conditions and operating environment poor, rate of heating during normalizing steel rails and speed of cooling are affected by human factors more, cause normalizing quality fluctuation large, separately there is part unit in charge of construction control normalizing temperature " to see fire " mainly through workman and grasp heated condition, by external environment and artificial experience influence very big, and automatically cannot form construction record, normalizing quality cannot be reviewed; 6, flame normalizing needs the continuous conveying air bottles of workman, cold water cabinet, oxygen belt and well heater etc., and labour intensity is very large; 7, acetylene cylinder belongs to the pressurized vessel of shipment hazardous substance, and also often tempering etc. occurs when flame normalizing, this brings very large Hazard Factor all to the use of acetylene.
Summary of the invention
In order to solve the problem, the invention provides a kind of rail postwelding pressurize normalizing device, comprise generating set, intermediate frequency power supply, electric control system and hydraulic power unit, wherein generating set connects intermediate frequency power supply, it is characterized in that, described rail postwelding pressurize normalizing device also comprises: tackling system, and this tackling system is arranged on one end of rail postwelding pressurize normalizing device, and tackling system is connected with hydraulic power unit; With normalizing main frame, this normalizing main frame is arranged on the end of tackling system, and normalizing main frame is connected with hydraulic power unit with intermediate frequency power supply.
Further, this rail postwelding pressurize normalizing device comprises:
Heating power supply load, this heating power supply load is arranged on the middle part in normalizing main frame, and is connected to intermediate frequency power supply to receive the midfrequent AC electric current of intermediate frequency power supply transmission and to change the circulation of this medium frequency alternating current into low pressure electric current;
Gripping unit, this gripping unit comprises the front clamp device and the rear fixture that are separately positioned on the front and back of normalizing main frame along rail length direction;
Heater coil, this heater coil is arranged on the bottom of normalizing main frame, and is connected to heating power supply load with from low pressure electric current described in this heating power supply load-receipt;
Coil-driving apparatus of electronic, this coil-driving apparatus of electronic is arranged on the bottom of normalizing main frame, and coil-driving apparatus of electronic is connected with hydraulic power unit with heater coil respectively;
Coil alignment device, described coil alignment device is arranged on the bottom of normalizing main frame, and is connected with coil-driving apparatus of electronic with heater coil; With
Pressurize retractor device, pressurize retractor device is arranged on the mid-way of normalizing main frame bottom and is connected with hydraulic power unit, and the front end of pressurize retractor device is connected with described front clamp device, rear end is connected with described rear fixture.
Alternatively, rail postwelding pressurize normalizing device also comprises suspension bracket, and this suspension bracket is arranged on the top of normalizing main frame and is suspended in the end of tackling system.
Further, pressurize retractor device comprises interconnection hydraulic lock and pressurize telescopic oil cylinder.
Further, rail postwelding pressurize normalizing device also comprises temperature measuring equipment, and described temperature measuring equipment to be arranged between front clamp device with heating power supply load and to be connected with electric control system.
Further, rail postwelding pressurize normalizing device can also comprise air cooling system, and one end of air cooling system is connected with electric control system, and the other end of air cooling system is connected to normalizing main frame.
Alternatively, air cooling system comprises gas-holder and air compressor.
Further, electric control system can comprise on-line data acquisition and logging modle.
Alternatively, rail postwelding pressurize normalizing device can also comprise cooling system, and one end of described cooling system is connected with electric control system, and the other end of cooling system is connected to heater coil.
Further, cooling system comprises cooling-water machine, and described cooling-water machine is connected to heater coil cooling fluid is transported to heater coil in heat-processed.
Following technique effect can be reached by adopting postwelding pressurize normalizing device disclosed in the utility model: in steel rail weld joint heat treatment process, pressurize is carried out to rail, preventing the thermal stress butt junction of rail from causing damage and distortion; Adopt way of electromagnetic induction to heat, improve heating efficiency, section temperature is even, and under solving the processing modes such as flame heating, flame itself is on thermometric impact simultaneously, and then improves thermometric accuracy; Rail head temperature is heated in automatic measurement, has the feature such as real-time and data integrity; Realize the electrodeless conciliation of heating frequency, very favourable to the homogeneity improving section temperature; Adopt data gathering and logging modle, achieve automatic data collection, automatically record, store and management, and curve and the form that technician analyzes use is convenient in generation.
Accompanying drawing explanation
Above-mentioned and other side of the present utility model and feature present from below in conjunction with accompanying drawing the explanation of embodiment is clear, wherein:
Fig. 1 is the structural representation of existing pressure gas welding well heater;
Fig. 2 is the schematic diagram of the rail postwelding pressurize normalizing device according to the utility model embodiment;
Fig. 3 is the one-piece construction stereographic map of the rail postwelding pressurize normalizing device according to the utility model embodiment;
Fig. 4 is the structure iron of the normalizing main frame according to rail postwelding pressurize normalizing device of the present utility model; With
Fig. 5 is according to the data gathering of rail postwelding pressurize normalizing device of the present utility model and the operational flowchart of logging modle.
Embodiment
Describe illustrative, non-limiting example of the present utility model with reference to the accompanying drawings in detail, be further described according to rail postwelding pressurize normalizing device of the present utility model.
Fig. 2 and Fig. 3 is schematic diagram according to the rail postwelding pressurize normalizing device of embodiment of the present utility model and complete machine structure stereographic map respectively.
With reference to Fig. 2 and Fig. 3, comprise generating set 306, intermediate frequency power supply 308, electric control system 303 and hydraulic power unit 307 according to rail postwelding pressurize normalizing device of the present utility model.Generating set 306 connects intermediate frequency power supply 308, thinks that rail postwelding pressurize normalizing device provides reliable and stable electric energy, for operating process such as heating, control and records.Cause damage in order to carry out pressurize to rail in steel rail weld joint heat treatment process to prevent the thermal stress butt junction of rail, rail postwelding pressurize normalizing device of the present utility model also comprises tackling system 305 and normalizing main frame 309.Tackling system 305 is arranged on one end of rail postwelding pressurize normalizing device, and meanwhile, tackling system 305 is connected with hydraulic power unit 307, and the motion that hydraulic power unit 307 is tackling system 305 provides corresponding hydraulic power source.Normalizing main frame 309 is arranged on the end of tackling system 305, carries out normalizing heating and pressurize under the control of electric control system 303 to postwelding rail.In addition, normalizing main frame is also connected with hydraulic power unit 307 with intermediate frequency power supply 308.Thus, intermediate frequency power supply 308 provides required electric current to normalizing main frame, and hydraulic power unit 307 provides the hydraulic power source needed for its motivating force to normalizing main frame.According to the utility model, rail postwelding pressurize normalizing device is by the position of tackling system adjustment normalizing main frame, thus complete handling and the contraposition of normalizing main frame, and undertaken heating and pressurize by normalizing main frame, pressurize can be carried out to rail in steel rail weld joint treating processes.
Electric control system 303 is the control unit of rail postwelding pressurize normalizing device of the present utility model, be connected to each parts of rail postwelding pressurize normalizing device, for data such as the frequency in collecting device operational process, power, time, temperature, automatically control the heating of normalizing main frame 309 and the cooling work of air cooling system and cooling system according to the processing parameter preset, eliminate material factor that existing normal pneumatic weldering heating postheat treatment mode exists, human factor to the impact of heat-processed.
Fig. 4 is the structural representation of the normalizing main frame of the utility model rail postwelding pressurize normalizing device, wherein, 401 is suspension bracket, and 402 is heating power supply load, and 403 is temperature measuring equipment, 404 is front clamp device, 405 is coil alignment device, and 406 is heater coil, and 407 is rear fixture, 408 is pressurize retractor device, and 409 is coil-driving apparatus of electronic.
The internal structure aligning owner of the house where a fire started's machine 309 referring to Fig. 4 elaborates.Normalizing main frame 309 comprises heating power supply load 402, gripping unit, heater coil 406, coil-driving apparatus of electronic 409, coil alignment device 405 and pressurize retractor device 408.
Heating power supply load 402 is arranged on the middle part in normalizing main frame 309, and be connected to intermediate frequency power supply 308, to receive the midfrequent AC electric current that intermediate frequency power supply 308 sends, and the circulation of this medium frequency alternating current is changed to low pressure electric current (voltage: 0-50V, electric current: 0-3000A, this low pressure range of current is the span that those skilled in the art adopt usually) to supply heater coil 406.Such as, heating power supply load 402 can adopt the conventional mode in this area, by concussion amplifying circuit, medium frequency alternating current circulation is changed to low pressure electric current, but the conversion regime of electric current is not limited thereto, and the conventional any mode in this area can be adopted to change.In heat-processed, heating power supply load 402 has coordinated the change adaptation function of outer load (by heating rail) with intermediate frequency power supply 308, realize the electrodeless adjustment of heating frequency under the control of electric control system according to the change of load and power factor.
Gripping unit comprises the front clamp device 404 and the rear fixture 407 that are separately positioned on the front and back of normalizing main frame 309 along rail length direction, the rear and front end of normalizing main frame 309 can be fixed on the web of the rail position of the both sides rail of weld seam to be heated by front and back gripping unit, can not be moved relative to rail when ensureing that normalizing main frame 309 works, thus improve the stability of working order, ensure the quality of pressurize normalizing further.
Heater coil 406 is arranged on the bottom of normalizing main frame 309, and is connected to heating power supply load 402 with from the low pressure electric current after the conversion of this heating power supply load-receipt, thus forms powerful alternating electromagnetic field, to heat steel rail welding line.This employing electromagnetic induction carries out the mode heated, and effectively can improve heating efficiency, and the section temperature of heating is more even, and on the other hand, Electromagnetic Heating also to solve under flame type of heating not easily in real time, the problem of Measurement accuracy temperature.
Coil-driving apparatus of electronic 409 is arranged at the bottom of normalizing main frame 309, is connected respectively with hydraulic power unit 307, heater coil 406.Coil alignment device 405 is arranged on the bottom of normalizing main frame 309, and is connected with coil-driving apparatus of electronic 409 with heater coil 406.Before normalizing main frame 309 starts heating work, coil-driving apparatus of electronic 409 obtains hydraulic drive power from hydraulic power unit 307, and drive coil alignment device 405 helps heater coil 406 relative to steel rail welding line position centering and drives the opening of heater coil 406, closed with the heating controlling heater coil 406.
Pressurize retractor device 408 is arranged on the mid-way of the bottom of normalizing main frame 309.The front end of pressurize retractor device 408 is connected with front clamp device 404, rear end is connected with rear fixture 407, is connected respectively again with hydraulic power unit 307, electric control system 303.When normalizing main frame 309 pairs of rail welding places heat, front clamp device 404 and rear fixture 407 clamp the rail of the both sides of weld seam to be heated respectively, electric control system 303 provides certain hydraulic pressure according to temperature conditions hydraulic control pumping plant 307 to pressurize retractor device 408, thus make the front-end and back-end of pressurize retractor device 408 apply certain hydraulic pressure pwc stress to front clamp device 404 and rear fixture 407 respectively, lock the state of pressurize retractor device 408 simultaneously, thus the stress that when offsetting heating, rail produces because temperature variation elongates or shortens, and then gripping unit can not move relative to rail before and after ensureing, reach the function of pressurize.
Alternatively, pressurize retractor device 408 can comprise interconnective hydraulic lock and pressurize telescopic oil cylinder (not shown).In described embodiment, when pressurize retractor device applies certain hydraulic pressure pwc stress, by the filling of hydraulic lock locking pressurize telescopic oil cylinder, and then the state of locking pressurize retractor device 408, to reach the function of pressurize.
As shown in Figure 4, according to an embodiment, normalizing main frame 309 can also comprise suspension bracket 401, this suspension bracket is arranged on the top of normalizing main frame and is suspended in the end (as shown in Figure 3) of tackling system 305, for other each functional component of carrying normalizing main frame 309, under the effect of tackling system, play the effect of support and mobile normalizing main frame 309.
Preferably, normalizing main frame 309 may further include temperature measuring equipment 403, described temperature measuring equipment is connected with electric control system 303, for the temperature variation data at rail head position in on-line monitoring heat-processed, and by real-time data transmission to electric control system 303.In the embodiment shown in fig. 4, temperature measuring equipment 403 is arranged between front clamp device 404 and heating power supply load 402.Because rail postwelding pressurize normalizing device of the present utility model adopts electromagnetic induction heating mode, so the work of temperature measuring equipment 303 can not be subject to the factor impacts such as flame, make measuring tempeature accurate; Again because temperature measuring equipment 403 is arranged near rail head position, so can measure in real time, there is real-time, guarantee data integrity.But the installation site of temperature measuring equipment in normalizing main frame is not limited thereto, as long as ensure that temperature measuring equipment can measure steel rail weld joint by the temperature variation at rail head position in heat-processed.
See Fig. 2 and Fig. 3, preferably also air cooling system can be comprised according to rail postwelding pressurize normalizing device of the present utility model, one end of air cooling system is connected with electric control system 303, and the other end is connected to normalizing main frame 309, thus to the steel rail weld joint accelerating cooling after heating under the control of electric control system 303.Further, such as, air cooling system can comprise gas-holder 301 and air compressor 302, and electric control system 303 controls gas-holder 301 and provides gas to air compressor, and by air compressor 302, cooling gas is fed to normalizing main frame.In addition, preferably also can comprise cooling system according to rail postwelding pressurize normalizing device of the present utility model, one end of described cooling system is connected with electric control system 303, and the other end is connected to heater coil 406.Such as, cooling system can comprise cooling-water machine 304, and cooling-water machine is connected to heater coil 406 and constantly carries cooling fluid (such as, cold water) to heater coil in heat-processed, reduces the temperature of heater coil 406, thus reduces coil thermal losses.
Fig. 2 is the schematic diagram of rail postwelding pressurize normalizing device of the present utility model.As shown in the figure, electric control system 303 is normalizing management system, by controlling intermediate frequency power supply 308, provides midfrequent AC power supply to normalizing main frame, controls intermediate frequency power supply 308 regulating frequency and load power simultaneously; By Controlled cooling system, cooling fluid is transported to heater coil 406, thus reduces the heat of heater coil 406, prevent coil impaired; By controlling air cooling system, reduce the rear rail head temperature of heating; Hydraulic control system, for tackling system 305, pressurize retractor device 408 and coil-driving apparatus of electronic 409 provide hydraulic power source.
Further, electric control system 303 comprises on-line data acquisition and logging modle.Fig. 5 is the operational flowchart of on-line data acquisition and logging modle.Data gathering and logging modle are arranged in electric control system 303, such as, can be arranged in the industrial control computer in electric control system.Specific works flow process is as follows: login system; Check whether digital serial port connects, if successful connection, then arranges initial parameter, if connect unsuccessful, then reconnects; Start serial communication after optimum configurations, send commencing signal and the data such as receive frequency, time, temperature, if data sink failure detected, then restart serial communication, if data sink success, then in real time analyzing and processing is carried out to received data; After data analysis is terminated, conversion data and on the display interface of indicating meter display data (required indicating meter can be the indicating meter that this area adopts usually); Result is stored in general-purpose storage (required storer is the storer that this area adopts usually); After storage terminates, send end signal to electric control system 303, and stop serial communication; Select according to operator, can parametric line, parameter report be generated to stored data results or log off.By arranging this data gathering and logging modle, the automatic collection of data, automatically record, store and management can be realized, and generate the curve and report form of being convenient to technician's analysis.
The operating process of rail postwelding pressurize normalizing device of the present utility model is as follows: a. starter-generator group 306, connects the general supply of postwelding pressurize normalizing device after question generator group 306 output voltage stabilization; B. electric control system 303 and data gathering and logging modle, air compressor 302, cooling-water machine 304 and hydraulic power unit 307 is started; C. open freight container 3 side door and hydraulic power unit 307, by tackling system 305, normalizing main frame 309 is placed on steel rail welding line place to be heated; D. operator arrange initial parameter; E. by electric control system 303 control coil drive unit 409, make the center of heater coil 406 corresponding with welding joint center; F. control temperature measuring equipment 403 by electric control system 303 and align point for measuring temperature, be generally the rail head position of pending rail; G. clamp heater coil 406, and confirm that coil does not contact with pending rail; H. front clamp device 404 and rear fixture 407 clamp the rail of weld seam both sides to be heated respectively; I. intermediate frequency power supply 308 is started; J. start normalizing main frame 309 button, actuating coil heating schedule, simultaneity factor starts to record the data such as time in heat-processed, temperature, frequency and power; K. when monitoring rail head temperature or after reaching predetermined value heat-up time, heating schedule stops automatically, electric control system 303 controls gas-holder 301, valve Welded Joints place spray wind opened by air compressor 302, until spray wind terminates; L., after spray wind terminates, heat treatment process completes, and opens heater coil 406, front and back gripping unit, and pressurize retractor device; M. start tackling system 305 and normalizing main frame 309 is regained freight container.
Although be illustrated exemplary embodiments of the present utility model, but obviously it will be appreciated by those skilled in the art that, can change when not deviating from spirit of the present invention and principle, its scope limits in claims and its equivalent.
Claims (10)
1. a rail postwelding pressurize normalizing device, comprises generating set, intermediate frequency power supply, electric control system and hydraulic power unit, and wherein said generating set connects described intermediate frequency power supply, it is characterized in that, described rail postwelding pressurize normalizing device also comprises:
Tackling system, described tackling system is arranged on one end of described rail postwelding pressurize normalizing device, and described tackling system is connected with described hydraulic power unit; With
Normalizing main frame, described normalizing main frame is arranged on the end of described tackling system, and described normalizing main frame is connected with described hydraulic power unit with described intermediate frequency power supply.
2. rail postwelding pressurize normalizing device according to claim 1, it is characterized in that, described normalizing main frame comprises:
Heating power supply load, described heating power supply load is arranged on the middle part in described normalizing main frame, and is connected to described intermediate frequency power supply to receive the midfrequent AC electric current of described intermediate frequency power supply transmission and to change described medium frequency alternating current circulation into low pressure electric current;
Gripping unit, described gripping unit comprises the front clamp device and the rear fixture that are separately positioned on the front and back of described normalizing main frame along rail length direction;
Heater coil, described heater coil is arranged on the bottom of described normalizing main frame, and is connected to described heating power supply load with from low pressure electric current described in described heating power supply load-receipt;
Coil-driving apparatus of electronic, described coil-driving apparatus of electronic is arranged on the bottom of described normalizing main frame, and described coil-driving apparatus of electronic is connected with described hydraulic power unit with described heater coil respectively;
Coil alignment device, described coil alignment device is arranged on the bottom of described normalizing main frame, and is connected with described coil-driving apparatus of electronic with described heater coil; With
Pressurize retractor device, described pressurize retractor device is arranged on the mid-way of described normalizing main frame bottom and is connected with described hydraulic power unit, and the front end of described pressurize retractor device is connected with described front clamp device, rear end is connected with described rear fixture.
3. rail postwelding pressurize normalizing device according to claim 2, it is characterized in that, described normalizing main frame also comprises:
Suspension bracket, described suspension bracket is arranged on the top of described normalizing main frame and is suspended in the described end of described tackling system.
4. rail postwelding pressurize normalizing device according to claim 2, it is characterized in that, described pressurize retractor device comprises interconnection hydraulic lock and pressurize telescopic oil cylinder.
5. rail postwelding pressurize normalizing device according to claim 2, it is characterized in that, described normalizing main frame also comprises:
Temperature measuring equipment, described temperature measuring equipment to be arranged between described front clamp device with described heating power supply load and to be connected with described electric control system.
6. rail postwelding pressurize normalizing device according to claim 1, is characterized in that, described rail postwelding pressurize normalizing device also comprises:
Air cooling system, one end of described air cooling system is connected with described electric control system, and the other end of described air cooling system is connected to described normalizing main frame.
7. rail postwelding pressurize normalizing device according to claim 6, it is characterized in that, described air cooling system comprises gas-holder and air compressor.
8. rail postwelding pressurize normalizing device according to claim 1, it is characterized in that, described electric control system comprises on-line data acquisition and logging modle.
9. rail postwelding pressurize normalizing device according to claim 2, is characterized in that, described rail postwelding pressurize normalizing device also comprises:
Cooling system, one end of described cooling system is connected with described electric control system, and the other end of described cooling system is connected to described heater coil.
10. rail postwelding pressurize normalizing device according to claim 9, it is characterized in that, described cooling system comprises cooling-water machine, and described cooling-water machine is connected to described heater coil cooling fluid is transported to described heater coil in heat-processed.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420622656.2U CN204251656U (en) | 2014-10-24 | 2014-10-24 | Rail postwelding pressurize normalizing device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420622656.2U CN204251656U (en) | 2014-10-24 | 2014-10-24 | Rail postwelding pressurize normalizing device |
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| CN204251656U true CN204251656U (en) | 2015-04-08 |
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| CN201420622656.2U Active CN204251656U (en) | 2014-10-24 | 2014-10-24 | Rail postwelding pressurize normalizing device |
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