Movable steel rail heating device and using method

Abstract

The invention discloses a movable steel rail heating device and a using method, the movable steel rail heating device comprises a flat car, a generator set, a transformer, an induction heating power supply, a coil lifting assembly, a steel rail profiling coil, a support and a controller, and the flat car comprises a platform and four rail wheels; the steel rail profiling coil is installed at the bottom of the support and used for heating a rail head and a rail web of a line steel rail. The coil lifting assembly comprises a lead screw, a worm gear and a worm, the worm gear and the worm are meshed, the lead screw comprises a connecting end and a telescopic end, the connecting end is fixed to the top of the support, the telescopic end penetrates through the platform, the worm gear is arranged on the outer side wall of the telescopic end in a sleeving mode and matched with the lead screw in a spiral mode, and a hand-cranking wheel is arranged at one end of the worm. The lead screw drives the support and the steel rail profiling coil to ascend and descend together. According to the movable steel rail heating device and the using method, an operator can conveniently move the device on site, the temperature of the steel rail can be rapidly increased to the locking rail temperature, and the temperature of the steel rail is evenly increased.

Description

Technical Field

[0001] The present invention relates to the technical field of rail welding, and more specifically, to a mobile rail heating device and a using method thereof. Background Art

[0002] Rail welding and additive repair are important links in laying continuous welded rail tracks and are important guarantees for the safety of train operation on the tracks. During the process of mobile rail welding, due to temperature changes, the actual locked rail temperature may deviate from the designed locked rail temperature, and then compressive stress or tensile stress may be generated inside the continuous welded rail track. For example, in summer, due to the increase in temperature, the temperature compressive stress generated inside the continuous welded rail track increases, and rail buckling may occur; in winter, when the temperature decreases, the temperature tensile stress increases, and rail breakage may occur. These are not conducive to track safety and are likely to form potential safety hazards. The climates of different railway administrations are diverse and the natural conditions vary greatly. Due to the large difference between the operating rail temperature and the locked rail temperature difference, it is difficult to execute the mobile welding construction plan.

[0003] During the process of rail additive repair, due to high energy density and high cooling rate, martensite structure is easily formed, which cannot meet the requirements of TB / T 2344.1-2020 "Rail Part 1: Rails from 43 kg / m to 75 kg / m". In order to inhibit the formation of martensite, induction heating needs to be used to preheat the area to be repaired of the rail to a certain temperature so that the cooling rate during its cooling process is lower than the critical cooling rate.

[0004] Therefore, whether during the process of mobile rail welding or during the process of rail additive repair, it is necessary to heat the rail up to the locked rail temperature.

[0005] The prior art uses three methods to restore the locked rail temperature of the track: 1) One method uses charcoal to heat the rail. This method has unstable heating effect and a single heat transfer path. Only the bottom corner of the rail is heated, and the temperature gradient of the rail cross-section is large, which may cause overheating of the bottom corner of the rail while the rail head is still at a low temperature; 2) The second method uses a gas flame to heat the rail, and a self-made mobile gas heating trolley is used to heat the rail. However, in actual situations, the required time differs greatly from the theoretical calculation. This method does not consider the heat loss of the flame. While the heating is fast, the heat dissipation is also fast, and the heating effect is difficult to reach the ideal state; 3) The third method uses a tension welding method, which requires welding and heat treatment of the joint under the state that the rail has tensile force, and it is not convenient for the construction personnel to move the device on site. Summary of the Invention

[0006] In view of this, the purpose of the present invention is to provide a mobile rail heating device and a using method thereof, so as to facilitate the construction personnel to move the device on site, quickly raise the rail temperature to the locked rail temperature, and the rail is heated evenly.

[0007] For the above purposes, the present invention provides a mobile rail heating device, which includes a flatbed trolley, a generator set, a transformer, an induction heating power supply, a coil lifting assembly, a rail profiling coil, a bracket and a controller, wherein: the flatbed trolley includes a platform and four track wheels, and the four track wheels are respectively installed at the four corners of the flatbed trolley. The track wheels are arranged at the bottom of the flatbed trolley and are used to drive the flatbed trolley to move on the line rail; the generator set, the transformer and the induction heating power supply are respectively installed on the platform; the rail profiling coil is installed at the bottom of the bracket, and the rail profiling coil is electrically connected to the transformer. The rail profiling coil is used to heat the rail head and rail waist of the line rail; the coil lifting assembly includes a lead screw, a meshing worm gear and a worm. The lead screw includes a connection end and a telescopic end. The connection end is fixed at the top of the bracket, and the telescopic end passes through the platform. The worm gear is sleeved on the outer side wall of the telescopic end and is in spiral cooperation with the lead screw. One end of the worm is provided with a hand crank. When the hand crank is rotated, the lead screw drives the bracket and the rail profiling coil to lift together; the controller is in communication connection with the generator set, the transformer, the induction heating power supply and the rail profiling coil.

[0008] Optionally, the flatbed trolley further includes a handle, and a brake handle is arranged on the handle.

[0009] Optionally, the transformer includes copper bars, and the copper bars are electrically connected to the rail profiling coil through flexible cables.

[0010] Optionally, the material of the rail profiling coil is copper. The rail profiling coil includes a connected arched plate, a current inlet plate and a current outlet plate. The current inlet plate is connected to the current output end of the transformer, and the current outlet plate is connected to the current input end of the transformer. When the rail profiling coil is energized, the current sequentially passes through the current inlet plate, the arched plate and the current outlet plate. The arched plate is arranged outside the rail head and rail waist of the line rail and has a gap with both the rail head and rail waist of the line rail to heat the rail head and rail waist of the line rail.

[0011] Optionally, clamping platforms are arranged at the bottoms of the generator set, the transformer and the induction heating power supply, and clamping grooves are formed on the platform. The clamping platforms are clamped in the clamping grooves.

[0012] Optionally, it further includes a positioning pin. A first positioning hole is formed on the clamping platform, and a second positioning hole is formed on the clamping groove. After the positioning pin sequentially passes through the first positioning hole and the second positioning hole, the clamping platform is installed in the clamping groove.

[0013] Optionally, the coil lifting assembly further includes a lifting tabletop and a housing. An installation hole is provided on the housing. The worm passes through the installation hole and is rotatably installed on the housing. The worm gear and the worm are both arranged inside the housing. The hand crank is located outside the housing. The bottom of the housing is installed on the lifting tabletop, and the lifting tabletop is installed on the platform.

[0014] Optionally, the generator set, the transformer, the induction heating power supply, the coil lifting assembly, and the controller are all detachably installed on the platform, and the rail profiling coil is detachably installed on the bracket.

[0015] Based on the same inventive concept, the present invention also provides a method for using a mobile rail heating device. The mobile rail heating device described in any one of the foregoing is used to heat the track rail of a line, including the following steps:

[0016] Step 1: Investigate the line conditions and the skylight time plan arrangement information of the construction section in advance, master the length of the track rail to be heated, measure the rail temperature of the track rail, determine the locking rail temperature to which the rail needs to be heated, and determine the number of mobile rail heating devices to be equipped.

[0017] Step 2: Before construction, determine the size of the rail profiling coil adapted to the track rail according to the types of track slabs and fasteners of the line track. Install the rail profiling coil at the bottom of the bracket, electrically connect the rail profiling coil to the transformer. The rail profiling coil is used to heat the rail head and rail waist of the track rail. Install the generator set, the transformer, and the induction heating power supply on the platform respectively. Fix the connection end of the lead screw at the top of the bracket, pass the telescopic end of the lead screw through the platform and helically cooperate with the worm gear, and mesh the worm with the worm gear. When the hand crank is rotated, the lead screw drives the bracket and the rail profiling coil to lift and lower together.

[0018] Step 3: Carry the thermocouple thermometer to the construction site, place the mobile rail heating device on the track rail of the line, and place the rail profiling coil above the track rail to be heated.

[0019] Step 4: Connect the cables between the generator set, the induction heating power supply, the transformer, and the rail profiling coil to ensure firm wiring. The copper busbar of the coil and the transformer is connected by a flexible cable. The transformer and the induction heating power supply are connected by a cable. The generator set and the induction power supply are connected by a cable. Start the generator set, the induction heating power supply, and the transformer in advance to ensure the normal operation of each component. After confirming the normal operation of each component, turn off the transformer, the induction heating power supply, and the generator set in sequence.

[0020] Step 5: Rotate the hand crank to lower the rail profiling coil to the rail head and rail waist of the track rail to be heated, and there is a gap between the coil and the rail head and rail waist. Turn on the generator set and the induction heating power supply in sequence.

[0021] Step Six: The operator pushes the trolley to move, so that the rail profiling coil moves on the rail of the line to be heated, and reciprocally moves and heats the rail of the line to be heated;

[0022] Step Seven: The operator uses a thermocouple thermometer to measure the temperature of the rail of the heated line. When the rail temperature reaches the locking rail temperature, the transformer, the induction heating power supply and the generator set are turned off in sequence, and the handwheel is rotated to raise the rail profiling coil away from the rail.

[0023] Optionally, it further includes Step Eight: Detach the generator set, the transformer and the induction heating power supply from the platform of the flat trolley, and evacuate the mobile rail temperature-rising device from the line.

[0024] The mobile rail temperature-rising device and the using method provided by the present invention. The mobile rail temperature-rising device includes a flat trolley, a generator set, a transformer, an induction heating power supply, a coil lifting assembly, a rail profiling coil, a bracket and a controller. First, install the rail profiling coil at the bottom of the bracket, electrically connect the rail profiling coil with the transformer. The rail profiling coil is used to heat the rail head and the rail waist of the line rail. Install the generator set, the transformer and the induction heating power supply on the platform respectively. Fix the connecting end of the lead screw at the top of the bracket, and pass the telescopic end of the lead screw through the platform to be in spiral fit with the worm gear. Mesh the worm with the worm gear. When the handwheel is rotated, the lead screw drives the bracket and the rail profiling coil to lift and lower together. Then, carry the thermocouple thermometer to the construction site, place the mobile rail temperature-rising device on the line rail, place the rail profiling coil above the line rail to be heated, rotate the handwheel to make the rail profiling coil drop to the rail head and the rail waist of the line rail to be heated, and there is a gap between the rail profiling coil and the rail head and the rail waist. Turn on the generator set and the induction heating power supply in sequence. Finally, the operator pushes the trolley to move, so that the rail profiling coil moves on the line rail to be heated, and reciprocally moves and heats the line rail to be heated. The operator uses a thermocouple thermometer to measure the temperature of the heated line rail until the rail temperature reaches the locking rail temperature, and then rotates the handwheel to raise the rail profiling coil away from the rail. The mobile rail temperature-rising device and the using method provided by the present invention are convenient for the operator to move the device on site, can quickly raise the rail temperature to the locking rail temperature, and heat both the rail head and the rail waist of the line rail, so as to make the rail temperature rise evenly. Description of the Drawings

[0025] The following will describe in detail the preferred embodiments of the present invention through the drawings, which will help to understand the purpose and advantages of the present invention, wherein:

[0026] Figure 1 It is a schematic structural diagram of the mobile rail temperature-rising device of an embodiment of the present invention placed on the on-line rail;

[0027] Figure 2 Schematic installation diagram of the coil lifting assembly, platform, rail profiling coil, bracket, and on-line rail in the mobile rail heating device according to an embodiment of the present invention;

[0028] Figure 3 Partial structural schematic diagram of the coil lifting assembly in the mobile rail heating device according to an embodiment of the present invention;

[0029] Figure 4 First view of the structure of the rail profiling coil in the mobile rail heating device according to an embodiment of the present invention;

[0030] Figure 5 Second view of the structure of the rail profiling coil in the mobile rail heating device according to an embodiment of the present invention;

[0031] Figure 6 Schematic position diagram between the rail profiling coil and the line rail in the mobile rail heating device according to an embodiment of the present invention;

[0032] Figure 7 Flow chart of the usage method of the mobile rail heating device according to an embodiment of the present invention.

[0033] Description of reference numerals:

[0034] 1: Flatbed trolley; 2: Generator set; 3: Transformer; 4: Induction heating power supply; 5: Coil lifting assembly; 6: Rail profiling coil; 7: Bracket; 8: Platform; 9: Track wheel; 10: Lead screw; 11: Worm gear; 12: Worm; 13: Connection end; 14: Telescopic end; 15: Handle; 16: Brake handle; 17: Copper busbar; 18: Arch plate; 19: Current inlet plate; 20: Current outlet plate; 21: Lifting table surface; 22: Outer shell; 23: Line rail; 24: Handwheel. Detailed Description of the Invention

[0035] The present invention will be described in detail below in conjunction with embodiments. The same components are denoted by the same reference numerals. It should be noted that the terms "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to the directions in the drawings, and the terms "inner" and "outer" refer to the directions towards or away from the geometric center of a specific component, respectively.

[0036] As Figure 1 、 Figure 2 、 Figure 3 and Figure 6As shown in the figure, the mobile rail heating device provided by the present invention includes a flatbed trolley 1, a generator set 2, a transformer 3, an induction heating power supply 4, a coil lifting assembly 5, a rail profiling coil 6, a bracket 7 and a controller. Among them: The flatbed trolley 1 includes a platform 8 and four track wheels 9. The four track wheels 9 are respectively installed at the four corners of the flatbed trolley 1. The track wheels 9 are arranged at the bottom of the flatbed trolley 1 and are used to drive the flatbed trolley 1 to move on the line rail 23; The generator set 2, the transformer 3 and the induction heating power supply 4 are respectively installed on the platform 8; The rail profiling coil 6 is installed at the bottom of the bracket 7. The rail profiling coil 6 is electrically connected to the transformer 3 and is used to heat the rail head and rail waist of the line rail 23; The coil lifting assembly 5 includes a lead screw 10, a meshing worm gear 11 and a worm 12. The lead screw 10 includes a connection end 13 and a telescopic end 14. The connection end 13 is fixed at the top of the bracket 7. The telescopic end 14 passes through the platform 8. The worm gear 11 is sleeved on the outer side wall of the telescopic end 14 and is in screw fit with the lead screw 10. One end of the worm 12 is provided with a hand crank 24. When the hand crank 24 is rotated, the lead screw 10 drives the bracket 7 and the rail profiling coil 6 to lift together; The controller is in communication connection with the generator set 2, the transformer 3, the induction heating power supply 4 and the rail profiling coil 6.

[0037] It should be noted that: The generator set 2 can be a 15KW gasoline generator three-phase 380V; The induction heating power supply 4 can be a 15KW air-cooled high-frequency induction heating power supply 4; The transformer 3 can be a 300KVA self-cooled high-frequency transformer 3; The rail profiling coil 6 is arranged on one side of the platform 8 and is positioned above the line rail 23 when not in operation; The distance between the two track wheels 9 located on the two side line rails 23 is equal to the railway standard gauge; The transformer 3 and the induction heating power supply 4 are connected by a cable, and the generator set 2 and the induction power supply are connected by a cable.

[0038] The mobile rail heating device provided by the present invention includes a flatbed trolley 1, a generator set 2, a transformer 3, an induction heating power supply 4, a coil lifting assembly 5, a rail profiling coil 6, a bracket 7 and a controller. First, the rail profiling coil 6 is installed at the bottom of the bracket 7, and the rail profiling coil 6 is electrically connected to the transformer 3. The rail profiling coil 6 is used to heat the rail head and rail waist of the line rail 23. The generator set 2, the transformer 3 and the induction heating power supply 4 are respectively installed on the platform 8. The connecting end 13 of the lead screw 10 is fixed to the top of the bracket 7. The telescopic end 14 of the lead screw 10 passes through the platform 8 and is in spiral cooperation with the worm gear 11. The worm 12 is engaged with the worm gear 11. When the hand wheel 24 is rotated, the lead screw 10 drives the bracket 7 and the rail profiling coil 6 to lift together. Then, the thermocouple thermometer is carried to the construction site. The mobile rail heating device is placed on the line rail 23. The rail profiling coil 6 is placed above the line rail 23 to be heated. The hand wheel 24 is rotated to make the rail profiling coil 6 drop to the rail head and rail waist of the line rail 23 to be heated, and there is a gap between the rail profiling coil 6 and the rail head and rail waist. The generator set 2 and the induction heating power supply 4 are turned on in sequence. Finally, the operator pushes the trolley to move, so that the rail profiling coil 6 moves on the line rail 23 to be heated, and the line rail 23 to be heated is heated by reciprocating movement. The operator uses the thermocouple thermometer to measure the temperature of the heated line rail 23 until the rail temperature reaches the locking rail temperature. The hand wheel 24 is rotated to make the rail profiling coil 6 rise away from the rail. The mobile rail heating device provided by the present invention is convenient for the operator to move the device on site, can quickly raise the rail temperature to the locking rail temperature, and heats both the rail head and rail waist of the line rail 23, so as to make the rail temperature rise evenly.

[0039] As Figure 1 shown, the flatbed trolley 1 further includes a handle 15, and a brake handle 16 is arranged on the handle 15. In this embodiment, this component makes the flatbed trolley 1 in a braking state under normal conditions. During operation, the operator pinches the brake handle 16 on the handle 15, and the braking state of the flatbed trolley 1 is relieved. At this time, the flatbed trolley 1 can run on the rail. The operator releases the brake handle 16, and the flatbed trolley 1 re-enters the braking state to prevent the flatbed trolley 1 from slipping on a large slope section and causing a safety accident.

[0040] As Figure 2 shown, the transformer 3 includes a copper busbar 17, and the copper busbar 17 is electrically connected to the rail profiling coil 6 through a flexible cable. In this embodiment, when the rail profiling coil 6 lifts, the flexible cable can move along with the rail profiling coil 6, improving the convenience of use of the mobile rail heating device.

[0041] As Figure 4 、 Figure 5 and Figure 6As shown, the material of the rail profiling coil 6 is copper. The rail profiling coil 6 includes an arched plate 18, a current inlet plate 19, and a current outlet plate 20 that are connected. The current inlet plate 19 is connected to the current output end of the transformer 3, and the current outlet plate 20 is connected to the current input end of the transformer 3. When the rail profiling coil 6 is energized, the current flows through the current inlet plate 19, the arched plate 18, and the current outlet plate 20 in sequence. The arched plate 18 is arranged outside the rail head and web of the line rail 23, and there are gaps between the arched plate 18 and the rail head and web of the line rail 23 to heat the rail head and web of the line rail 23. In this embodiment, the arched plate 18, the current inlet plate 19, and the current outlet plate 20 are directly spliced to form the rail profiling coil 6. There are gaps between the rail profiling coil 6 and the rail head and web of the line rail 23. The non-contact heating method is adopted, and the eddy current heating principle is used to heat the rail. The heating speed is fast, the heating effect is good, clean energy is used, which conforms to the development concept of low-carbon environmental protection in China. Moreover, the rail profiling coil 6 with this structure has a large cross-sectional area, can withstand large current input, has a good cooling effect, and has a large contact area with the air. When the heating operation is completed and the rail profiling coil 6 is separated from the rail, this structure has relatively low functional requirements for the transmission action, improving the convenience of use of the mobile rail heating device.

[0042] In an embodiment of the present invention, clamping platforms are provided at the bottoms of the generator set 2, the transformer 3, and the induction heating power supply 4. Clamping grooves are formed on the platform 8, and the clamping platforms are clamped in the clamping grooves. This clamping method can conveniently install the generator set 2, the transformer 3, and the induction heating power supply 4 on the platform 8, or can conveniently disassemble the generator set 2, the transformer 3, and the induction heating power supply 4 from the platform 8, improving the convenience of installation or disassembly of the mobile rail heating device.

[0043] In an embodiment of the present invention, a positioning pin is further included. A first positioning hole is formed on the clamping platform, and a second positioning hole is formed on the clamping groove. After the positioning pin passes through the first positioning hole and the second positioning hole in sequence, the clamping platform is installed in the clamping groove. The positioning pin can stably install the generator set 2, the transformer 3, and the induction heating power supply 4 on the platform 8, improving the structural stability of the mobile rail heating device.

[0044] As Figure 2As shown in the figure, the coil lifting assembly 5 further includes a lifting tabletop 21 and a housing 22. An installation hole is provided on the housing 22. The worm 12 passes through the installation hole and is rotatably installed on the housing 22. The worm gear 11 and the worm 12 are both arranged inside the housing 22. The handwheel 24 is located outside the housing 22. The bottom of the housing 22 is installed on the lifting tabletop 21, and the lifting tabletop 21 is installed on the platform 8. In this embodiment, the housing 22 can prevent the worm gear 11 and the worm 12 from being touched, ensuring the normal operation of the coil lifting assembly 5. The lifting tabletop 21 can enable the coil lifting assembly 5 to be stably installed on the platform 8 of the flatbed trolley 1, improving the structural stability of the mobile rail heating device.

[0045] As Figure 1 shown, the generator set 2, the transformer 3, the induction heating power supply 4, the coil lifting assembly 5, and the controller are all detachably installed on the platform 8, and the rail profiling coil 6 is detachably installed on the bracket 7. In this embodiment, the rail profiling coil 6 can be installed on the bracket 7 by bolts. The generator set 2, the transformer 3, the induction heating power supply 4, the coil lifting assembly 5, and the controller are all detachably installed on the platform 8, which can facilitate the quick assembly and disassembly of the generator set 2, the transformer 3, the induction heating power supply 4, the coil lifting assembly 5, and the controller, so that the operators can conveniently carry and transport the mobile rail heating device.

[0046] As Figures 1 to 7 shown, based on the same inventive concept, the present invention also provides a method for using a mobile rail heating device. Using the mobile rail heating device of any of the foregoing embodiments to heat the line rail 23, the method includes the following steps:

[0047] Step 1: Investigate the line conditions and the planned information of the skylight time in the construction section in advance, master the length of the line rail 23 to be heated, measure the rail temperature of the line rail 23, determine the locking rail temperature to which the rail needs to be heated, and determine the number of mobile rail heating devices to be equipped;

[0048] Step 2: Before construction, according to the types of line track slabs and fasteners, determine the size of the rail profiling coil 6 adapted to the line rail 23, install the rail profiling coil 6 at the bottom of the bracket 7, electrically connect the rail profiling coil 6 to the transformer 3. The rail profiling coil 6 is used to heat the rail head and rail waist of the line rail 23. Install the generator set 2, the transformer 3, and the induction heating power supply 4 on the platform 8 respectively. Fix the connecting end 13 of the lead screw 10 to the top of the bracket 7, pass the telescopic end 14 of the lead screw 10 through the platform 8 and helically cooperate with the worm gear 11, and mesh the worm 12 with the worm gear 11. When the handwheel 24 is rotated, the lead screw 10 drives the bracket 7 and the rail profiling coil 6 to lift and lower together;

[0049] Step 3: Carry the thermocouple thermometer to the construction site, place the mobile rail heating device on the line rail 23, and place the rail profiling coil 6 above the line rail 23 to be heated.

[0050] Step 4: Connect the cables between the generator set 2, the induction heating power supply 4, the transformer 3, and the rail profiling coil 6 to ensure that the wiring is firm. The coil is connected to the copper busbar 17 of the transformer 3 through a flexible cable. The transformer 3 and the induction heating power supply 4 are connected through a cable. The generator set 2 and the induction power supply are connected through a cable. Start the generator set 2, the induction heating power supply 4, and the transformer 3 in advance to ensure that each component operates normally. After confirming that each component is normal, turn off the transformer 3, the induction heating power supply 4, and the generator set 2 in sequence.

[0051] Step 5: Rotate the handwheel 24 to lower the rail profiling coil 6 to the rail head and web of the line rail 23 to be heated, and there should be a gap between the coil and the rail head and web. Then turn on the generator set 2 and the induction heating power supply 4 in sequence.

[0052] Step 6: The operator pushes the trolley to move, so that the rail profiling coil 6 moves on the line rail 23 to be heated, and reciprocally moves to heat the line rail 23 to be heated.

[0053] Step 7: The operator uses the thermocouple thermometer to measure the temperature of the heated line rail 23. When the rail temperature reaches the locking rail temperature, turn off the transformer 3, the induction heating power supply 4, and the generator set 2 in sequence, and rotate the handwheel 24 to raise the rail profiling coil 6 away from the rail.

[0054] In an embodiment of the present invention, it further includes Step 8: Dismantle the generator set 2, the transformer 3, and the induction heating power supply 4 from the platform 8 of the flat trolley 1, and remove the mobile rail heating device from the line, which improves the convenience of use of the mobile rail heating device.

[0055] The mobile rail heating device and its usage method provided by the present invention. The mobile rail heating device includes a flatbed trolley 1, a generator set 2, a transformer 3, an induction heating power supply 4, a coil lifting assembly 5, a rail profiling coil 6, a bracket 7 and a controller. First, install the rail profiling coil 6 at the bottom of the bracket 7, electrically connect the rail profiling coil 6 to the transformer 3. The rail profiling coil 6 is used to heat the head and web of the track rail 23 of the line. Install the generator set 2, the transformer 3 and the induction heating power supply 4 on the platform 8 respectively. Fix the connecting end 13 of the lead screw 10 at the top of the bracket 7, pass the telescopic end 14 of the lead screw 10 through the platform 8 and helically cooperate with the worm gear 11, and engage the worm 12 with the worm gear 11. When the handwheel 24 is rotated, the lead screw 10 drives the bracket 7 and the rail profiling coil 6 to lift and lower together. Then, carry the thermocouple thermometer to the construction site, place the mobile rail heating device on the track rail 23 of the line, place the rail profiling coil 6 above the track rail 23 to be heated, rotate the handwheel 24 to make the rail profiling coil 6 drop to the head and web of the track rail 23 to be heated, and there is a gap between the rail profiling coil 6 and the head and web. Turn on the generator set 2 and the induction heating power supply 4 in sequence. Finally, the operator pushes the trolley to move, so that the rail profiling coil 6 moves on the track rail 23 to be heated, and reciprocally moves to heat the track rail 23 to be heated. The operator uses the thermocouple thermometer to measure the temperature of the heated track rail 23 until the rail temperature reaches the locking temperature, and then rotate the handwheel 24 to make the rail profiling coil 6 rise away from the rail. The mobile rail heating device and its usage method provided by the present invention facilitate the operator to move the device on site, can quickly raise the rail temperature to the locking temperature, and heat both the head and web of the track rail 23 of the line, so as to make the rail temperature rise evenly.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A mobile rail heating device, characterized in that, It includes a flatbed trolley, a generator set, a transformer, an induction heating power supply, a coil lifting assembly, a rail profiling coil, a bracket and a controller, wherein: The flatbed trolley includes a platform and four track wheels. The four track wheels are respectively installed at the four corners of the flatbed trolley. The track wheels are arranged at the bottom of the flatbed trolley and are used to drive the flatbed trolley to move on the line rail. The generator set, the transformer and the induction heating power supply are respectively installed on the platform. The rail profiling coil is installed at the bottom of the bracket. The rail profiling coil is electrically connected to the transformer and is used to heat the rail head and rail waist of the line rail. The coil lifting assembly includes a lead screw, a meshing worm wheel and a worm. The lead screw includes a connecting end and a telescopic end. The connecting end is fixed at the top of the bracket. The telescopic end passes through the platform. The worm wheel is sleeved on the outer side wall of the telescopic end and is in spiral cooperation with the lead screw. One end of the worm is provided with a hand crank. When the hand crank is rotated, the lead screw drives the bracket and the rail profiling coil to lift together. The controller is in communication connection with the generator set, the transformer, the induction heating power supply and the rail profiling coil.

2. The mobile rail heating device according to claim 1, wherein, The flatbed trolley further includes a handle, and a brake handle is arranged on the handle.

3. The mobile rail heating device according to claim 1, characterized in that, The transformer includes a copper busbar, and the copper busbar is electrically connected to the rail profiling coil through a flexible cable.

4. The mobile rail heating device according to claim 1, characterized in that, The rail profiling coil is made of copper. The rail profiling coil includes a connected arched plate, a current inlet plate and a current outlet plate. The current inlet plate is connected to the current output end of the transformer, and the current outlet plate is connected to the current input end of the transformer. When the rail profiling coil is powered on, the current flows through the current inlet plate, the arched plate and the current outlet plate in sequence. The arched plate is arranged outside the rail head and rail waist of the line rail and has a gap with the rail head and rail waist of the line rail to heat the rail head and rail waist of the line rail.

5. The mobile rail heating device according to claim 1, characterized in that, The bottoms of the generator set, the transformer and the induction heating power supply are all provided with clamping platforms. Clamping grooves are opened on the platform, and the clamping platforms are clamped in the clamping grooves.

6. The mobile rail heating device according to claim 1, characterized in that, It further includes a positioning pin. A first positioning hole is opened on the clamping platform, and a second positioning hole is opened on the clamping groove. After the positioning pin passes through the first positioning hole and the second positioning hole in sequence, the clamping platform is installed in the clamping groove.

7. The mobile rail heating device according to claim 1, characterized in that, The coil lifting assembly further includes a lifting tabletop and a housing. An installation hole is opened on the housing. The worm passes through the installation hole and is rotatably installed on the housing. The worm wheel and the worm are both arranged inside the housing. The hand crank is located outside the housing. The bottom of the housing is installed on the lifting tabletop, and the lifting tabletop is installed on the platform.

8. The mobile rail heating device according to claim 1, characterized in that, The generator set, the transformer, the induction heating power supply, the coil lifting assembly and the controller are all detachably installed on the platform, and the rail profiling coil is detachably installed on the bracket.

9. A method for using a mobile rail heating device, which uses the mobile rail heating device according to any one of claims 1-8 to heat the track rail, characterized in that, It includes the following steps: Step 1: Conduct a preliminary investigation on the line conditions and the skylight time plan of the construction section in advance, master the length of the rails on the line to be heated, measure the rail temperature of the line rails, determine the locking rail temperature to which the rails need to be heated, and determine the number of mobile rail heating devices to be equipped. Step 2: Before construction, determine the size of the rail profiling coil adapted to the line rails according to the type of track slab and fastener of the line, install the rail profiling coil at the bottom of the bracket, electrically connect the rail profiling coil to the transformer. The rail profiling coil is used to heat the rail head and rail waist of the line rails. Install the generator set, transformer, and induction heating power supply on the platform respectively. Fix the connecting end of the lead screw at the top of the bracket, pass the telescopic end of the lead screw through the platform and engage it with the worm gear. Engage the worm with the worm gear. When the hand wheel is rotated, the lead screw drives the bracket and the rail profiling coil to rise and fall together. Step 3: Carry the thermocouple thermometer to the construction site, place the mobile rail heating device on the line rails, and place the rail profiling coil above the line rails to be heated. Step 4: Connect the cables between the generator set, induction heating power supply, transformer, and rail profiling coil to ensure that the wiring is firm. Connect the copper bar of the coil and the transformer through a flexible cable, connect the transformer and the induction heating power supply through a cable, and connect the generator set and the induction power supply through a cable. Start the generator set, induction heating power supply, and transformer in advance to ensure that each component operates normally. After confirming that each component is normal, turn off the transformer, induction heating power supply, and generator set in sequence. Step 5: Rotate the hand wheel to lower the rail profiling coil to the rail head and rail waist of the line rails to be heated, and leave a gap between the coil and the rail head and rail waist. Turn on the generator set and induction heating power supply in sequence. Step 6: The operator pushes the trolley to move, so that the rail profiling coil moves on the line rails to be heated, and reciprocally moves to heat the line rails to be heated. Step 7: The operator uses the thermocouple thermometer to measure the temperature of the heated line rails. When the rail temperature reaches the locking rail temperature, turn off the transformer, induction heating power supply, and generator set in sequence, and rotate the hand wheel to lift the rail profiling coil away from the rails.

10. The method for using the mobile rail heating device according to claim 9, characterized in that, It also includes Step 8: Dismantle the generator set, transformer, and induction heating power supply from the platform of the flat trolley, and remove the mobile rail heating device from the line.

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