CN212277963U - Power supply device of mobile flash rail welding machine - Google Patents
Power supply device of mobile flash rail welding machine Download PDFInfo
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- CN212277963U CN212277963U CN202021200016.4U CN202021200016U CN212277963U CN 212277963 U CN212277963 U CN 212277963U CN 202021200016 U CN202021200016 U CN 202021200016U CN 212277963 U CN212277963 U CN 212277963U
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Abstract
The invention relates to a power supply device, in particular to a power supply device of a mobile flash rail welding machine. The defects and the problems of the existing mobile flash rail welding machine adopting a diesel generator set as a power supply device are solved. The power supply device comprises a container house body, wherein the container house body comprises a storage battery cabinet with a storage battery pack therein, a super capacitor cabinet with a super capacitor bank therein, a power conversion cabinet with a bidirectional DC/DC converter therein, a welding inverter cabinet with a welding main inverter therein, an auxiliary inverter cabinet with an auxiliary inverter therein, a main control cabinet and an output cabinet; the super capacitor bank is connected with one end of the bidirectional DC/DC converter, the other end of the bidirectional DC/DC converter is connected with the input end of the welding main inverter, the output end of the storage battery pack is connected with the input end of the welding main inverter through an isolating switch KM2, and the output end of the welding main inverter supplies power to the mobile flash welding rail machine; the input end of the auxiliary inverter is connected with the output end of the storage battery pack.
Description
Technical Field
The utility model relates to a power supply unit specifically is power supply unit of removal flash welding rail machine.
Background
In order to finish heavy-load and high-speed transportation and improve riding comfort of modern railways, a method of laying a seamless line is generally adopted to improve a track structure. Research shows that the current rail welding of the seamless railway in China mainly adopts a flash welding technology, and accounts for about 87 percent of the number of welding joints of the whole seamless rail. In the railway line welding operation of China, the existing mobile flash rail welding machine mostly adopts a diesel generator set power supply mode, the application and transportation of the whole welding equipment generally adopt a configuration mode of 2 standard containers, one container is configured with a diesel generator set, the other container is configured with a rail welding machine, an electric control cabinet and other equipment, and the 2 containers form an organic whole through components such as power cables, so that the diesel generator set continuously provides power for the rail welding machine and auxiliary equipment thereof, and the whole movement of the equipment is realized through a railway flat plate transport vehicle.
The existing mobile flash rail welding machine adopts a diesel generator set as a power supply device, the technical scheme that the existing diesel generator set supplies power to the rail welding machine is shown in figure 1, and the arrangement of the diesel generator set in a container house is shown in figure 2. The diesel generator set is of a three-phase four-wire system, and rated outputs three-phase alternating current 380V voltage. When the rail welding machine works, the three-phase diesel generating set is started, and two phases of the three-phase diesel generating set are taken as single-phase power supplies to supply power to the rail welding machine. On the other hand, through the three-phase four-wire diesel generator set, three-phase 380V and 220V power supplies required by auxiliary systems related to welding can be provided for various auxiliary loads. The power supply device adopting the diesel generating set has the following defects: (1) because the rail welding machine load has the conditions of severe voltage, current and power factor changes, large harmonic component and instantaneous short circuit, the output frequency and the output voltage of the diesel generator set cannot be kept constant for a long time, and particularly in the preflash and upset stages of the welding process, the output frequency, the output voltage and the power factor cos phi of the diesel generator set are temporarily reduced to different degrees, so that the welding quality is influenced. (2) When the rail welding machine is used for welding operation, two phases in the three-phase diesel generator set are used for supplying power to the rail welding machine, so that the diesel generator set works in a state of serious unbalance of three-phase load for a long time, extra heating loss and short service life of the diesel generator set can be caused, and the maintenance cost is also increased. (3) The noise pollution caused by the long-term operation of the diesel generator set is also serious, the hearing of operators can be damaged, and diseases in other aspects can be induced. (4) Harmful gases such as nitrogen oxides, carbon oxides and the like discharged when the diesel generating set works pollute the environment and are harmful to physical and psychological health of field workers, which is particularly obvious in subway construction.
With the gradual implementation of sustainable green development strategy for protecting environment in China, the power supply mode is not suitable for the development of high-speed railways in China. According to the requirements on technical upgrading and innovation of track welding construction equipment in 'Chinese manufacturing 2025' and the strategic targets of green sustainable development in China, the power supply device of a new generation of mobile flash welding track machine with independent intellectual property rights in China is imperative to be developed.
Disclosure of Invention
The utility model provides a defect and the problem that current removal flash welding rail machine adopted diesel generating set to exist as power supply unit provides a power supply unit who removes flash welding rail machine.
The utility model discloses an adopt following technical scheme to realize: the power supply device of the mobile flash rail welding machine comprises a container house body, wherein the container house body comprises a storage battery cabinet, a super capacitor cabinet, a power conversion cabinet, a welding inversion cabinet, an auxiliary inversion cabinet, a main control cabinet and an output cabinet, wherein the storage battery cabinet is internally provided with a storage battery pack; the super capacitor bank is connected with one end of the bidirectional DC/DC converter, the other end of the bidirectional DC/DC converter is connected with the input end of the welding main inverter, the output end of the storage battery pack is connected with the input end of the welding main inverter through an isolating switch KM2, and the output end of the welding main inverter supplies power to the mobile flash welding rail machine; the input end of the auxiliary inverter is connected with the output end of the storage battery pack, and the output end of the auxiliary inverter is used as the auxiliary power supply output of the power supply device. When welding operation is needed, the isolating switch KM2 is switched off, the low voltage of the super capacitor bank is boosted to the working voltage required by the welding main inverter through the boosting function of the bidirectional DC/DC converter, and the welding main inverter outputs single-phase 380V alternating current required by the mobile flash rail welding machine. The energy stored in the super capacitor bank is enough for welding once. After one welding operation is completed, the isolating switch KM2 is closed, and the high-voltage electricity of the storage battery pack is converted into the low-voltage charging voltage required by the super capacitor pack through the voltage reduction function of the bidirectional DC/DC converter, so that the super capacitor pack is rapidly charged, and the preparation is made for the next welding operation. When the electric quantity of the storage battery pack is low, the storage battery pack can be charged through a ground or vehicle-mounted charger. The output end of the auxiliary inverter provides required three-phase 380V alternating current for auxiliary equipment attached to the rail welding machine and the electric load of the power supply device.
Furthermore, a 380VAC/220VAC transformer connected to the output end of the auxiliary inverter is also arranged in the auxiliary inverter cabinet, and the secondary side of the 380VAC/220VAC transformer provides required single-phase 220V alternating current for auxiliary equipment attached to the rail welding machine and the electric load of the power supply device. The secondary side of the 380VAC/220VAC transformer is also connected with an Uninterruptible Power Supply (UPS) arranged in the main control cabinet, and the UPS provides required low voltage for the main control cabinet of the power supply device.
And the container house further comprises a capacitor discharge cabinet with controllable on-off, the capacitor discharge cabinet is connected between two input/output ends of the super capacitor bank in parallel, and a discharge resistor is arranged in the capacitor discharge cabinet. When the energy storage of the super capacitor bank needs to be discharged during maintenance, the capacitor discharge cabinet is controlled to be conducted, and the super capacitor bank discharges through the capacitor discharge cabinet, so that the energy storage of the super capacitor bank is consumed on a resistor in the capacitor discharge cabinet.
The output cabinet is externally provided with high-low voltage input and output interfaces for realizing the functions of monitoring the running state of the system externally, driving the rail welding machine to work and the like. The output cabinet includes that national standard battery charges interface 1, weld 2 single-phase 380V power supply quick interfaces of rail machine, auxiliary power supply 380V interface 1, auxiliary power supply 220V interface 1, system scram signal interface 1, and system remote monitoring and communication interface 1, above interface all is the plug form that adopts quick electric connector, convenient operation.
The utility model has the advantages that:
1. because the power supply system composed of the storage battery pack and the power electronic device is adopted to replace the traditional three-phase diesel generator set to be used as the power supply of the mobile flash rail welding machine, compared with the conventional diesel engine, the discharge amount of nitrogen oxides and carbon oxides is almost zero, particularly when underground rails such as subways are welded, the pollution of oil smoke is avoided, and the physical and mental health of operators is facilitated.
2. Because pure electric power is used as an energy source, the user is guided to charge the storage battery cabinet through the charger at night when the electricity price is low until a set value is reached; the method realizes the peak clipping and valley filling of the electricity charge of the user in the valley period with more electricity and less electricity in the peak period, thereby improving the economic benefit of the user. According to calculation, the fuel consumed by adopting the diesel generating set in one year is about 6 multiplied by 104L, fuel cost 39 ten thousand yuan. The electricity consumed by the device of the invention per year is about 9 multiplied by 104kWh, the electricity charge is 9 ten thousand yuan, and the fuel cost can be saved by about 30 ten thousand yuan when the electric vehicle works for one year.
3. Compared with a power supply mode of a diesel generator set, the power supply device provided by the invention hardly generates noise, and is beneficial to increasing the working comfort.
4. The power electronic equipment is almost maintenance-free, so that the service life of the equipment can be greatly prolonged, and the maintenance cost is reduced.
5. The adoption of the storage battery driving mode is beneficial to changing the resource development mode of China and optimizing the energy consumption structure. The system charges the storage battery by using the power grid, increases the application of electric power in the field of rail transit energy, reduces the dependence on petroleum resources, and optimizes the traffic energy structure. Meanwhile, the method can also drive the further development and technology upgrade of related industries, such as batteries, power electronic key parts and related service industries, and improve the employment rate.
6. The room body possesses to outer remote monitoring interface, and degree of automation is high. The internal layout structure is compact, and the maintenance is convenient.
Drawings
FIG. 1 is a schematic diagram of a power supply device of a conventional mobile flash rail welding machine;
FIG. 2 is a layout diagram of a conventional diesel generator set in a container room;
FIG. 3 is a schematic diagram of a power supply device of the mobile flash rail welding machine according to the present invention;
fig. 4 is a layout diagram of the inside of a container room of a power supply device of the mobile flash rail welding machine of the present invention;
fig. 5 is a block diagram of a control system of a power supply device of the mobile flash rail welding machine according to the present invention.
Detailed Description
The power supply device of the mobile flash rail welding machine comprises a container house body, wherein the container house body comprises a storage battery cabinet, a super capacitor cabinet, a power conversion cabinet, a welding inversion cabinet, an auxiliary inversion cabinet, a main control cabinet and an output cabinet, wherein the storage battery cabinet is internally provided with a storage battery pack; the super capacitor bank is connected with one end of the bidirectional DC/DC converter, the other end of the bidirectional DC/DC converter is connected with the input end of the welding main inverter, the output end of the storage battery pack is connected with the input end of the welding main inverter through an isolating switch KM2, and the output end of the welding main inverter supplies power to the mobile flash welding rail machine; the input end of the auxiliary inverter is connected with the output end of the storage battery pack, and the output end of the auxiliary inverter is used as the auxiliary power supply output of the power supply device. The output cabinet comprises 1 national standard storage battery charging interface, 2 single-phase 380V power supply quick interfaces of the rail welding machine, 1 auxiliary power supply 380V interface, 1 auxiliary power supply 220V interface, 1 system emergency stop signal interface and 1 system remote monitoring and communication interface. The auxiliary inverter cabinet is also internally provided with a 380VAC/220VAC transformer connected with the output end of the auxiliary inverter. The secondary side of the 380VAC/220VAC transformer is also connected with an uninterruptible power supply UPS arranged in the main control cabinet. The container house body also comprises a capacitor discharge cabinet with controllable on-off, the capacitor discharge cabinet is connected in parallel between two input/output ends of the super capacitor group, and a discharge resistor is arranged in the capacitor discharge cabinet.
In specific implementation, the container house body further comprises a capacitance control cabinet, and an isolating switch KW1 arranged in the capacitance control cabinet is arranged between the super capacitor bank and the bidirectional DC/DC converter so as to facilitate maintenance and switching control of the super capacitor bank; an isolating switch KM3 arranged in the storage battery cabinet and a contactor KM4 arranged in the auxiliary inverter cabinet are arranged between the storage battery pack and the auxiliary inverter, so that the switching control and the maintenance of the storage battery pack and the auxiliary inverter are facilitated. For convenient welding operation and safety consideration, the outside of the container house is also provided with a quick operation button box, the start-stop button of the UPS is led to the button box through an outgoing line, the button box also comprises an auxiliary inverter start-stop button and an indicator lamp, a welding main inverter start-stop button and an indicator lamp, and a welding system stop button and a system emergency stop button. In order to ensure that the whole system can adapt to various extreme environments for operation, a storage battery pack in the storage battery cabinet adopts a water-cooling heat dissipation structure; when the temperature of the working environment is higher, the water cooling unit is automatically started to circulate the cooling medium to cool the storage battery pack through an instruction. A self-heating structure is also arranged in the storage battery cabinet; when the temperature of the working environment is lower, the optimal working temperature range of the storage battery pack is ensured through the self-heating function in the storage battery cabinet. The welding inverter cabinet, the auxiliary inverter cabinet and the power conversion cabinet are also internally provided with self-heating structures, an air-cooling heat dissipation mode is adopted, meanwhile, the container house body is also provided with a plurality of heating and ventilating devices, and the working temperature of other parts in the container house body is controlled within a certain range.
The container house body is of an all-steel structure, and the bottom pry, the framework, the outer wall and the hoisting device are welded into a whole. The container house is externally covered with a heat-insulating layer made of polystyrene insulating environment-friendly materials, has enough strength and is suitable for field and tunnel welding rail operation environments. The interior decoration material of the container house is fireproof, flame-retardant and environment-friendly, and has the functions of fire prevention, sand prevention, shock prevention, water prevention and the like. A humiture meter and a smoke alarm are installed in the container house body, and the humiture and the smoke in the house can be effectively monitored and alarmed. An automatic temperature control electric heater is arranged in an electronic element which cannot normally work in a low-temperature environment in the container house body, and the system can be started under the condition of minus 30 degrees. The container room is internally provided with 2 special electric fire extinguishers, a movable cover plate is designed on the ground in the room, and meanwhile, antistatic rubber insulating rubber is laid on the floor, so that the safety performance requirement is met. In order to facilitate installation and maintenance, a maintenance channel is arranged in the middle of the container house body, the storage battery cabinet, the power conversion cabinet, the welding inverter cabinet, the main control cabinet and the output cabinet are sequentially arranged on one side, and the super capacitor cabinet, the capacitor control cabinet, the capacitor discharge cabinet and the auxiliary inverter cabinet are sequentially arranged on the other side; and maintenance doors are arranged on two sides of the house body, so that equipment installation and daily maintenance are facilitated. A plurality of ventilation shutters are arranged around the container house body and are provided with axial flow fans and rain-proof edges, so that the ventilation, heat dissipation and rain-proof performance inside the container house body are guaranteed.
The main control cabinet is powered by a secondary side of a 380VAC/220VAC transformer and an Uninterruptible Power Supply (UPS), the main control cabinet comprises a main controller, the UPS, a super capacitor management system board (CMS) and a storage battery pack power management system Board (BMS), the main controller comprises a power module control board and a Programmable Logic Controller (PLC) which are used for controlling IGBT power modules in a welding main inverter, an auxiliary inverter and a bidirectional DC/DC converter, and each power module control board comprises a Digital Signal Processor (DSP) board, an input/output (IO) board, a fiber board and a signal detection circuit; the input/output IO board is connected with a signal detection circuit, and the signal detection circuit has the functions of current measurement, voltage measurement and open-phase detection; the DSP board carries out calculation and control according to the collected current and voltage signals; the optical fiber board sends PWM pulses obtained by calculation of the DSP to the IGBT driving circuit board of the bidirectional DC/DC converter, the auxiliary inverter and the welding main inverter through optical fibers so as to drive the bidirectional DC/DC converter, the auxiliary inverter and the welding main inverter to work. The PLC is used as a control core of the system and is responsible for communication between components and the system and functions of detection, control, protection and the like of functions of all parts. In order to realize the monitoring of the running states of the storage battery pack, the super capacitor bank, the bidirectional DC/DC converter, the auxiliary inverter and the welding main inverter, the main control cabinet is provided with a touch display screen, wherein the bidirectional DC/DC converter, the auxiliary inverter, the welding main inverter and the PLC are communicated through RS 485. The storage battery pack, the super capacitor pack and the PLC are communicated by a CANbus, and data of the storage battery pack and the super capacitor pack are displayed on the touch display screen to realize data transmission and receive system instructions. The local display screen and the remote monitoring display screen are communicated with the PLC through the Ethernet, and information feedback and remote control are achieved.
When the system is started, an AC 220V power supply is provided for the main control cabinet through a UPS starting button on a container house body, a 24V power supply rectifying module is integrated in the main control cabinet, the AC 220V power supply can be converted into a DC 24V power supply to be supplied to each control unit circuit board, the control unit circuit boards comprise a main PLC, a power module control board, a super capacitor management system board (CMS), a storage battery pack power management system Board (BMS) and the like, and the BMS is activated to enable the storage battery pack to output a DC voltage of 450 plus 657V for the whole system to use. The system sends a command to close the isolating switch KM3 and the contactor KM4, starts the auxiliary inverter and supplies power to various auxiliary loads, including a hydraulic oil pump motor, various cooling fans, a storage battery water-cooling unit, an air conditioner and the like. Meanwhile, the main control cabinet is directly supplied with power through a 380VAC/220VAC auxiliary transformer, and the UPS is in an online charging standby state.
When the rail welding machine is used for welding, the super capacitor bank discharges, the isolating switch KM2 is opened, and the isolating switch KM1 is closed. The main controller controls the duty ratio of a power device in the bidirectional DC/DC converter to enable the power device to work in a Boost mode, conversion from 480VDC voltage to 650VDC voltage of the super capacitor 200 is achieved, and power is provided for the welding main inverter. The main controller sends PWM pulses to control a power device of a welding main inverter through signals such as direct current voltage and the like detected by a voltage sensor, the front end of the inverter is connected to a direct current bus in parallel, and single-phase 380V alternating current meeting the requirements is output to drive a welding machine to work. And appropriate LC filter circuits are designed for the outputs of the auxiliary inverter and the welding main inverter, so that higher harmonics except fundamental waves are filtered, and the quality of a power supply is ensured.
When the rail welding machine stops welding, the super capacitor bank needs to be charged, the isolating switch KM2 is closed, the Buck voltage reduction function of the bidirectional DC/DC converter is realized by controlling the duty ratio of a power device in the bidirectional DC/DC converter, the storage battery pack with rated voltage of 579V is reduced, and the super capacitor bank is rapidly charged to prepare for next welding. When the electric quantity of the storage battery pack is low, the storage battery pack can be charged through a ground or vehicle-mounted charger.
Claims (10)
1. A power supply device of a mobile flash rail welding machine comprises a container house body and is characterized in that the container house body comprises a storage battery cabinet, a super capacitor cabinet, a power conversion cabinet, a welding inverter cabinet, an auxiliary inverter cabinet, a main control cabinet and an output cabinet, wherein the storage battery cabinet is internally provided with a storage battery pack; the super capacitor bank is connected with one end of the bidirectional DC/DC converter, the other end of the bidirectional DC/DC converter is connected with the input end of the welding main inverter, the output end of the storage battery pack is connected with the input end of the welding main inverter through an isolating switch KM2, and the output end of the welding main inverter supplies power to the mobile flash welding rail machine; the input end of the auxiliary inverter is connected with the output end of the storage battery pack, and the output end of the auxiliary inverter is used as the auxiliary power supply output of the power supply device.
2. The power supply device for the mobile flash rail welding machine according to claim 1, wherein a 380VAC/220VAC transformer connected to the output end of the auxiliary inverter is further arranged in the auxiliary inverter cabinet.
3. The power supply device of a mobile flash rail welding machine according to claim 2, characterized in that the secondary side of the 380VAC/220VAC transformer is also connected with an Uninterruptible Power Supply (UPS) arranged in the main control cabinet.
4. The power supply device of the mobile flash rail welding machine according to claim 3, wherein the output cabinet comprises 1 national standard storage battery charging interface, 2 single-phase 380V power supply quick interfaces of the rail welding machine, 1 auxiliary power supply 380V interface, 1 auxiliary power supply 220V interface, 1 system emergency stop signal interface and 1 system remote monitoring and communication interface.
5. A power supply device for a mobile flash rail welding machine according to claim 4, wherein the container house further comprises a capacitor discharge cabinet with controllable on/off, the capacitor discharge cabinet is connected in parallel between the two input/output terminals of the super capacitor bank, and a discharge resistor is arranged in the capacitor discharge cabinet.
6. The power supply device of the mobile flash rail welding machine according to claim 5, characterized in that the container room further comprises a capacitance control cabinet, and an isolating switch KM1 arranged in the capacitance control cabinet is arranged between the super capacitor bank and the bidirectional DC/DC converter; an isolating switch KM3 arranged in the storage battery cabinet and a contactor KM4 arranged in the auxiliary inverter cabinet are arranged between the storage battery pack and the auxiliary inverter.
7. The power supply device of a mobile flash rail welding machine according to claim 6, characterized in that a fast operating button box is arranged outside the container house, the start/stop button of the UPS is led to the button box through an outgoing line, and the button box further comprises an auxiliary inverter start/stop button and an indicator light, and a welding main inverter start/stop button and an indicator light.
8. The power supply device of the mobile flash rail welding machine according to claim 7, wherein a storage battery pack in the storage battery cabinet adopts a water-cooling heat dissipation structure; a self-heating structure is also arranged in the storage battery cabinet; self-heating structures are arranged in the welding inverter cabinet, the auxiliary inverter cabinet and the power conversion cabinet, an air-cooling heat dissipation mode is adopted, and meanwhile, a heating and ventilating device is also arranged on the container house body.
9. The power supply device of a mobile flash rail welding machine according to claim 8, wherein the container house is covered with an insulating layer made of polystyrene insulating environment-friendly materials; a humiture meter and a smoke alarm are arranged in the container house body; a maintenance channel is arranged in the middle of the container house body, the storage battery cabinet, the power conversion cabinet, the welding inversion cabinet, the main control cabinet and the output cabinet are sequentially arranged on one side, and the super capacitor cabinet, the capacitor control cabinet, the capacitor discharge cabinet and the auxiliary inversion cabinet are sequentially arranged on the other side; the periphery of the container house is provided with ventilation shutters and is provided with an axial flow fan and a rainproof edge.
10. The power supply device of a mobile flash rail welding machine according to claim 9, wherein the main control cabinet is powered by a secondary side of a 380VAC/220VAC transformer and an uninterruptible power supply UPS, the main control cabinet comprises a main controller, the uninterruptible power supply UPS, a super capacitor management system board and a storage battery power management system board, the main controller comprises a power module control board and a PLC for controlling IGBT power modules in a welding main inverter, an auxiliary inverter and a bidirectional DC/DC converter, and each power module control board comprises a DSP board, an input/output IO board, a fiber board and a signal detection circuit; the input/output IO board is connected with a signal detection circuit, and the signal detection circuit has the functions of current measurement, voltage measurement and open-phase detection; the DSP board carries out calculation and control according to the collected current and voltage signals; the optical fiber board sends PWM pulses obtained by calculation of the DSP to the IGBT driving circuit board of the bidirectional DC/DC converter, the auxiliary inverter and the welding main inverter through optical fibers so as to drive the bidirectional DC/DC converter, the auxiliary inverter and the welding main inverter to work; the power conversion cabinet, the auxiliary inverter cabinet and the welding inverter cabinet are provided with touch display screens, wherein the bidirectional DC/DC converter, the auxiliary inverter, the welding main inverter and the PLC are communicated through RS 485; and the storage battery pack, the super capacitor pack and the PLC are communicated by a CANbus.
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| CN202021200016.4U CN212277963U (en) | 2020-06-25 | 2020-06-25 | Power supply device of mobile flash rail welding machine |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111740459A (en) * | 2020-06-25 | 2020-10-02 | 中车永济电机有限公司 | Power supply device of mobile flash rail welding machine |
| CN113162203A (en) * | 2021-03-19 | 2021-07-23 | 常州市瑞泰工程机械有限公司 | Power supply method for rail flash welding |
| CN114537909A (en) * | 2022-01-20 | 2022-05-27 | 中联恒通机械有限公司 | Container with built-in heating device |
-
2020
- 2020-06-25 CN CN202021200016.4U patent/CN212277963U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111740459A (en) * | 2020-06-25 | 2020-10-02 | 中车永济电机有限公司 | Power supply device of mobile flash rail welding machine |
| CN113162203A (en) * | 2021-03-19 | 2021-07-23 | 常州市瑞泰工程机械有限公司 | Power supply method for rail flash welding |
| CN113162203B (en) * | 2021-03-19 | 2023-12-01 | 常州中车瑞泰装备科技有限公司 | Power supply method for track flash welding |
| CN114537909A (en) * | 2022-01-20 | 2022-05-27 | 中联恒通机械有限公司 | Container with built-in heating device |
| CN114537909B (en) * | 2022-01-20 | 2024-02-20 | 中联恒通机械有限公司 | Container with built-in heating device |
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