Tempering heat treatment device for on-site bainite turnout and pearlite steel rail welding joint

Abstract

The utility model provides a tempering heat treatment device for a welding joint of a bainite turnout and a pearlite steel rail on site, which comprises a fixed seat structure, a cold water tank, an electric control box, a speed reducing motor, an igniter, a heater for heating a bainite welding overheating area, a heater swinging mechanism, a heater centering mechanism, a sliding rail and a sliding block fixed seat structure, comprising a front-end fixing plate and a rear-end fixing plate, the lower sections of the front-end fixing plate and the rear-end fixing plate are provided with opening structures, and the front-end fixing plate and the rear-end fixing plate are connected through a horizontal adjusting steering plate; the horizontal adjusting steering plate and the rear end fixing plate are connected by a horizontal locking bolt through a connecting hole; according to the heater swing mechanism, a gear motor shaft is fixedly connected with a rotating rod, the other end of the rotating rod is hinged to a swing rod, and the other end of the swing rod is connected with a support. A connecting support for fixing a heater is arranged on the lower side of the sliding block, and the gear motor rotates to drive the swing rod to swing longitudinally.

Description

TECHNICAL FIELD

[0001] The utility model relates to tempering heat treatment device technical field especially relates to a kind of for on-site bainite turnout and pearlite rail welded joint tempering heat treatment device. BACKGROUND

[0002] At present, the normalizing equipment and process of the known pearlite rail welded joint heat treatment, and the bainite rail welded joint heat treatment process related report are more, relevant bainite turnout and pearlite rail welded joint tempering heat treatment equipment, currently, no relevant report has been seen.

[0003] The authorized announcement No.CN 101761002 B provides a kind of device for pearlite rail welded joint flame normalizing, the heater of this device includes multiple fire holes.The heater surrounds the welded joint and is configured to heat treat the welded joint with gas through the multiple fire holes.The heater is made of metal with thermal conductivity not less than 350W / (m·k) and has not less than 240000mm 2 The device includes support structure fixedly arranged relative to the rail, the heater according to the present application and sliding mechanism with first end and second end.The sliding mechanism is configured to be supported by the support structure and can slide in the direction of rail extension.Heater is installed on sliding mechanism.The core of the device is to heat pearlite rail welded joint to austenitizing temperature, then air cooling makes that welded joint obtains refined austenite grain, since heater does not use water cooling, structure is relatively simple, and there is great difference with the present application.

[0004] Application No.87202680 relates to a small multifunctional gas pressure welding machine, which can also be used for heat treatment of bainite and pearlite rail while performing pearlite rail gas welding.However, since the gas, gas flow and heating time and swing distance of the equipment are manually operated, automatic control cannot be realized, and therefore the heat treatment quality is greatly affected by human factors.

[0005] Application No. 201120260760.8 relates to a container type steel rail normalizing equipment for on-site pearlite steel rail welded joint normalizing heat treatment, comprising a steel rail medium frequency electric normalizing equipment, a generator, a container and auxiliary equipment, wherein the steel rail medium frequency electric normalizing equipment, the generator and the auxiliary equipment are fixed in the container, the equipment is bulky and weighs several tons, and is difficult to use on site. Application No. 201120365185.8 and 202221714726.8 both relate to steel rail induction normalizing equipment, comprising a medium frequency power supply, a capacitor, a transformer and a normalizing coil, the medium frequency power supply, the capacitor, the transformer and the normalizing coil are connected in series; the frequency of some normalizing equipment is variable, the transformer is a variable turn ratio transformer, or the capacitance of the capacitor can be changed. The above patents all relate to the induction heating mode of the steel rail. Since the induction heating mode is only suitable for heating the temperature to above the Curie point of the steel, that is, the austenitizing temperature, the material loses the magnetic field, and the heating efficiency is reduced by using the surface loss of the magnetic field to heat the core of the steel rail, so as to obtain the heating effect of uniform temperature inside and outside the steel rail. The tempering heat treatment heating temperature is lower than the Curie point, and it is difficult to achieve uniform temperature of the whole steel rail by using the induction heating mode, and therefore, it is not suitable for tempering heating.

[0006] All the above technologies only relate to the flame or induction normalizing heat treatment equipment of the pearlite steel rail welded joint, and the heating temperature and process are greatly different from the tempering of the bainite turnout-pearlite steel rail welded joint. At present, the bainite turnout and the pearlite steel rail tempering heat treatment equipment can be seen and used, and the flame size of the heater is adjusted once by experience every time, without quantitative requirements, the time cannot be accurately timed, and the swing of the heater is judged by the human eye. All these have large errors. Since the tempering temperature does not reach the red state of the steel rail, the heat treatment error is also quite large. Therefore, a special tempering heat treatment equipment suitable for the bainite turnout and the pearlite steel rail welded joint on site is needed. Practical new type content

[0007] The utility model discloses a kind of bainite turnout and pearlite steel rail welded joint tempering heat treatment devices for on-site, including fixed seat structure, cold water tank, electrical control box, speed reducer, igniter, tempering heat treatment device includes heater of heating bainite welding overheated zone, heater swing mechanism, heater centering mechanism;

[0008] The fixed seat structure includes front end fixed plate and rear end fixed plate, and the front end fixed plate and the rear end fixed plate are vertically arranged. The lower section of the front end fixed plate and the rear end fixed plate has an opening structure that can be clamped with a steel rail. The front end fixed plate and the rear end fixed plate are connected by a horizontal adjustment turning plate. The rear end of the horizontal adjustment turning plate has an adjustable connection hole. The horizontal adjustment turning plate and the rear end fixed plate are connected by a horizontal locking bolt through the connection hole. The opening structure of the rear end fixed plate is fixed with the steel rail by a fixing bolt.

[0009] The reduction motor is fixed to the rear section of the horizontal adjustment steering plate;

[0010] The front end fixed plate and the rear end fixed plate are provided with a slide rail, and the slide rail is provided with a sliding block;

[0011] The heater swing mechanism is fixedly connected with a rotating rod through a reduction motor shaft, the other end of the rotating rod is hingedly connected with a swing rod, the other end of the swing rod is connected with a vertical upward support pin shaft arranged on the sliding block, and a connecting support for fixing the heater is arranged on the lower side of the sliding block; the rotation of the reduction motor drives the swing rod to swing longitudinally along the steel rail, and then drives the vertical upward support on the sliding block, the sliding block and the connecting support for fixing the heater on the lower side of the sliding block to swing longitudinally along the steel rail, so that the heater swings longitudinally along the steel rail;

[0012] The cold water tank provides a cold water source through a pump;

[0013] The electric control box controls the size of the flame for the tempering heat treatment of the on-site bainite turnout and pearlitic rail welded joints, automatically ignites, the heater swings longitudinally along the rail, the swing speed of the heater is quantitatively adjusted, and the heating time is set;

[0014] The igniter on the side of the heater is fixed through the connecting support.

[0015] Further, the heater is divided into a left heater and a right heater, and is fixed through the connecting support for the heater on the lower side of the sliding block, and the inner side profile of the heater of the left heater and the right heater is matched with the outer profile of the rail.

[0016] Further, the heater internally comprises a gas passage and a circulating water passage;

[0017] The gas is unidirectionally introduced into the heater through the gas pipe, the inner side profile of the heater is provided with a fire hole, the fire hole is distributed around the rail welded joint, and the rail welded joint is heated;

[0018] The circulating water passage is distributed in the heater, the circulating water passage is provided with an upper and lower communication passage, the heater is externally provided with a water inlet connected with a water inlet pipe and a water outlet connected with a water outlet pipe, the cold water tank is connected with the heater to circulate water and cool, and overheating of the heater is avoided.

[0019] Further, the fire holes are uniformly distributed on the inner side profile of the heater, so that the rail welded joint is uniformly heated.

[0020] Further, the gas pipe and the water inlet pipe and the water outlet pipe outside the heater can be directionally adjusted, are suitable for the case that the distance between turnout rails is narrow, and the water inlet pipe and the water outlet pipe are connected with the cold water tank.

[0021] Further, the heater centering mechanism comprises the fixed seat structure and the heater swing mechanism.

[0022] The heater centering mechanism completes the horizontal and vertical direction adjustment of the heater centering adjustment.

[0023] The horizontal direction adjustment: the horizontal direction adjustment is realized by rotating the front end fixed plate as the fixed point in the horizontal direction, and adjusting the horizontal centering of the heater around the rail welded joint by the connecting bracket of the heater swing mechanism through the horizontal locking bolt.

[0024] The vertical direction adjustment: the rear end fixed plate is provided with a bracket, and the bracket is provided with a threaded hole; the distance between the vertical adjustment bolt and the rail is adjusted, and the vertical centering of the heater around the rail welded joint is adjusted by the connecting bracket of the heater swing mechanism.

[0025] Further, the fuel gas is a mixture of propane and oxygen or a mixture of liquefied gas and oxygen.

[0026] Further, the water inlet pipe, the water outlet pipe and the fuel gas pipe at the external joint of the heater are in a ninety-degree structure.

[0027] Further, the lower section of the front end fixed plate and the rear end fixed plate is provided with an opening structure capable of being clamped with the rail, which is a reverse U-shaped opening; the two vertical edges of the U-shaped opening of the front end fixed plate are provided with a gap with the rail; and the rear end fixed plate is fixed with the rail through the bolt. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 It is a three-dimensional schematic view of the switch bainite-pearlite tempering heat treatment device of the utility model;

[0029] Figure 2 It is a schematic view of the heater of the utility model;

[0030] Figure 3 It is a schematic view of the internal structure of the heater of the utility model;

[0031] Figure 4 It is a three-dimensional schematic view of the heater swing mechanism of the utility model;

[0032] Figure 5 It is another three-dimensional schematic view of the heater swing mechanism of the utility model;

[0033] Figure 6 It is a three-dimensional schematic view of the heater centering mechanism of the utility model;

[0034] Figure 7 It is a schematic view of the horizontal centering adjustment of the heater of the utility model;

[0035] Figure 8The utility model discloses an electrical control box schematic diagram.

[0036] Figure 9 The utility model discloses a tempering area schematic diagram.

[0037] Among them:

[0038] 1 - fixed seat 11 - front end fixed plate 12 - rear end fixed plate

[0039] 121 - support 122 - vertical adjusting bolt 123 - fixed bolt

[0040] 13 - horizontal adjusting steering plate 14 - horizontal locking bolt 15 - slide rail 16 - sliding block

[0041] 2 - cold water tank 3 - electrical control box

[0042] 4 - heater

[0043] 41 - left heater 42 - right heater 43 - fire hole 44 - heater inner side profile

[0044] 45 - water inlet pipe 46 - water outlet pipe 47 - gas pipe

[0045] 48 - gas passage 49 - circulating water passage 411 - circulating water upper and lower intercommunication passage

[0046] 5 - steel rail 6 - igniter heater centering mechanism 7 - speed reducer motor

[0047] 8 - heater swing mechanism

[0048] 81 - rotating rod 82 - swing lever 83 - support 84 - connecting support

[0049] 9 - igniter. DETAILED DESCRIPTION

[0050] In order to make the utility model's purpose, technical scheme and advantage more clearly clear, below combining with the attached drawing and example to the utility model for the on-site bainite turnout and pearlite rail welded joint tempering heat treatment device carries out further detailed explanation.It should be understood that the specific example described here is only used to explain the utility model, and is not used to limit the utility model.

[0051] A kind of for on-site bainite turnout and pearlite rail welded joint tempering heat treatment device, refer to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 、 Figure 9As shown, including fixed seat structure 1, cold water tank 2, electrical control box 3, speed reducer 7, igniter 9, tempering heat treatment device including heater 4, heater swing mechanism 8, heater centering mechanism 6;

[0052] The fixed seat structure 1, including front end fixed plate 11 and rear end fixed plate 12, the front end fixed plate 11 and the rear end fixed plate 12 are vertically arranged, the lower section of the front end fixed plate 11 and the rear end fixed plate 12 has an opening structure capable of being connected with the steel rail 5, the front end fixed plate 11 and the rear end fixed plate 12 are connected by the horizontal adjusting steering plate 13; the rear end of the horizontal adjusting steering plate 13 has an adjustable connecting hole, the horizontal adjusting steering plate 13 is connected with the rear end fixed plate 12 through the connecting hole by the horizontal locking bolt 14; the opening structure of the rear end fixed plate 12 is fixed with the steel rail 5 by the fixed bolt 123;

[0053] The speed reducer 7 is fixed to the rear section of the horizontal adjusting steering plate 13;

[0054] The front end fixed plate 11 and the rear end fixed plate 12 are provided with a slide rail 15, and the slide rail 15 is provided with a sliding block 16;

[0055] The heater swing mechanism 8 is fixedly connected with the rotating rod 81 through the shaft of the speed reducer 7, the other end of the rotating rod 81 is hingedly connected with the swing rod 82, the other end of the swing rod 82 is connected with the vertically upward support 83 through a pin shaft arranged on the sliding block 16; the lower side of the sliding block 16 is provided with a connecting support 84 for fixing the heater 4; the rotation of the speed reducer 7 drives the rotating rod 81 to drive the swing rod 82 to swing longitudinally along the steel rail 5, and then drives the vertically upward support 83 on the sliding block 16, the sliding block 16 and the connecting support 84 for fixing the heater 4 on the lower side of the sliding block 16 to swing longitudinally along the steel rail 5, so that the heater 4 swings longitudinally along the steel rail 5;

[0056] The cold water tank 2 provides a cold water source through a pump;

[0057] The electrical control box 3 controls the size of the flame for the tempering heat treatment of the bainite turnout and the pearlitic steel rail 5 welded joint, automatically ignites, the heater 4 swings longitudinally along the steel rail 5, the swing speed of the heater 4 is quantitatively adjusted, and the heating time is set;

[0058] The igniter 9 on the side of the heater 4 is fixed through the connecting support 84.

[0059] The cold water tank 2 and the heater 4 are connected through the water inlet pipe 45 and the water outlet pipe 46, and the pump provides power to make the cold water circulate in the heater 4.

[0060] Preferably, referring to Figure 1 、 Figure 2 、 Figure 3 、 Figure 5 、 Figure 7As shown, the heater 4 is divided into two independent parts: a left heater 41 and a right heater 42. They are fixed by the connecting bracket 84 of the heater 4 on the lower side of the slider 16. The inner surface 44 of the heaters of the left heater 41 and the right heater 42 matches the outer surface of the rail 5.

[0061] Preferably, see Figure 2 , Figure 3 , Figure 5 , Figure 7 As shown, the heater 4 includes a gas passage 48 and a circulating water passage 49 inside;

[0062] Gas is unidirectionally introduced into heater 4 through gas pipe 47. The inner surface 44 of heater is provided with flame holes 43, which are distributed around the rail welding joint to heat the rail welding joint.

[0063] The heater 4 has a circulating water channel 49 inside, and the circulating water channel 49 is provided with a circulating water connecting channel 411. The heater 4 has an inlet connected to the inlet pipe 45 and an outlet connected to the outlet pipe 46 on the outside. The cold water tank 2 is connected to the heater 4 for water circulation cooling to prevent the heater 4 from overheating.

[0064] Preferably, see Figure 2 , Figure 5 , Figure 7 As shown, the fire holes 43 are evenly distributed on the inner surface of the heater 4, so that the rail welding joint is heated evenly.

[0065] Preferably, see Figure 2 , Figure 3 , Figure 5 , Figure 7 As shown, the external gas pipe 47, water inlet pipe 45, and water outlet pipe 46 of the heater 4 can be adjusted in direction to adapt to situations where the spacing between the turnout rails 5 is narrow. The water inlet pipe 45 and water outlet pipe 46 are connected to the cold water tank 2.

[0066] See Figure 1 , Figure 4 , Figure 5 , Figure 6 , Figure 7 As shown, the heater centering mechanism 6 includes the fixed base structure 1 and the heater swing mechanism 8;

[0067] The heater centering mechanism 6 completes the centering adjustment of the heater 4, including horizontal and vertical adjustment;

[0068] The horizontal adjustment: the horizontal adjustment steering plate 13 rotates horizontally with the front fixed plate 11 as the fixed point, and the horizontal locking bolt 14 adjusts the horizontal alignment of the heater 4 around the welded joint of the rail 5 through the connecting bracket 84 of the heater swing mechanism 8.

[0069] Figure 7 The example given is a horizontal rotation, where the rotation of the horizontal adjustment steering plate drives the heater to rotate in one direction. The same applies when rotating in the opposite direction.

[0070] The vertical adjustment is as follows: the rear fixing plate 12 is provided with a bracket 121, and the bracket 121 is provided with a threaded hole. The distance between the vertical adjustment bolt 122 and the rail 5 is adjusted, and the vertical alignment of the heater 4 around the welded joint of the rail 5 is adjusted by the connecting bracket 84 of the heater swing mechanism 8.

[0071] In fact, the front fixing plate 11, the horizontal adjustment steering plate 13, the horizontal locking bolt 14, the slide rail 15 between the front fixing plate 11 and the rear fixing plate 12 of the fixed base structure 1, the slider 16 on the slide rail 15, and the rotating rod 81, the swing rod 82, the bracket 83, and the connecting bracket 84 of the heater swing mechanism 8 all participate in the centering adjustment of the heater 4. Objectively, the geared motor 7, the rotating rod 81, the swing rod 82, and the bracket 83, which are fixed to the horizontal adjustment steering plate 13, also play a certain stabilizing role in the centering adjustment process of the heater 4.

[0072] The function of the heater centering mechanism 6 is to achieve uniform circumferential distance between the heater 4 and the rail 5.

[0073] Preferably, the fuel gas is a mixture of propane and oxygen or a mixture of liquefied petroleum gas and oxygen.

[0074] Of course, the gas itself is propane or liquefied petroleum gas, and oxygen is added to ensure more complete combustion. It is mixed before entering heater 4.

[0075] See Figure 1 , Figure 2 , Figure 3 , Figure 5 , Figure 7 As shown, the water inlet pipe 45, water outlet pipe 46, and gas pipe 47 at the external connector of the heater 4 have a 90-degree structure. This allows for better adaptation to situations where the track spacing is small during on-site construction.

[0076] Preferably, see Figure 1 , Figure 5 , Figure 6 , Figure 7As shown, the lower sections of the front fixing plate 11 and the rear fixing plate 12 have inverted U-shaped openings that can engage with the rail 5; there are gaps between the two vertical sides of the U-shaped opening of the front fixing plate 11 and the rail 5; the rear fixing plate 12 is fixed to the rail 5 by bolts. The gaps between the two vertical sides of the U-shaped opening of the front fixing plate 11 and the rail 5 are to allow the horizontal adjustment steering plate 13 to rotate around the front fixing plate 11, thereby adjusting the gap between the heater 4 and the welding joint in the horizontal direction. A gap of 1-2 mm between the two vertical sides of the U-shaped opening of the front fixing plate 11 and the rail 5 is suitable.

[0077] In another embodiment, a method for tempering heat treatment of welded joints between bainitic turnouts and pearlitic rails in field is provided. The tempering heat treatment of the welded joints between bainitic turnouts and pearlitic rails in field includes:

[0078] (a) Installation of tempering heat treatment equipment

[0079] After the bainitic turnout and the pearlitic rail are welded, the fixing seat structure 1 of the tempering heat treatment device is installed on the rail 5 according to the part of the weld joint that needs to be heated. The fixing bolts 123 of the rear fixing plate 12 are tightened in advance to fix the tempering heat treatment device at the head of the rail 5. The slide rail 15 and the slider 16, as well as the heater swing mechanism 8 and the reduction motor 7 are installed. The heater 4 is fixed by the connecting bracket 84 of the heater 4. The reduction motor 7 is started, and the position of the heater 4 relative to the weld joint is observed so that the moving heater 4 is aligned with the part of the weld joint that needs to be heated. If there is a deviation, the position is adjusted back and forth by fixing the fixing bolts 123 of the rear fixing plate 12.

[0080] (ii) Centering adjustment of heater 4

[0081] The horizontal adjustment steering plate 13 rotates horizontally with the front fixed plate 11 as the fixed point, and the horizontal locking bolt 14 makes the heater 4 horizontally centered around the welded joint of the rail 5.

[0082] Adjust the distance between the vertical adjusting bolt 122 and the rail 5 so that the heater 4 is aligned vertically around the welded joint of the rail 5;

[0083] After centering adjustment, the rail welding joint is located at the center of heater 4 in both horizontal and vertical directions, so that the distance between the inner surface of heater 4 and the outer surface of rail 5 is uniform.

[0084] (III) Setting tempering parameters

[0085] Set the swing speed and heating time parameters for heater 4;

[0086] (iv) Connect the water circulation pipeline, gas pipeline, and oxygen pipeline, and check the water circulation, gas pipeline, and oxygen pipeline.

[0087] Connect the water pump power plug to the electrical control box 3 of the tempering heat treatment device, and connect the tempering heat treatment device to an AC220V power supply.

[0088] Connect oxygen and fuel gas to the fuel gas inlet of heater 4;

[0089] Check if there is water in cold water tank 2, check if the water pump is turned on normally, check if the water pipe joints are leaking, and check if the return water pipe is returning water normally.

[0090] Check the oxygen and gas solenoid valves: Press the "Gas On" button, then press and hold the "Ignition" button until the gas ignites, release the "Ignition" button, and then press the "Gas Off" button to turn off the gas; after the gas stops, press the "Oxygen On" button to observe whether the oxygen is turned on normally, and then press the "Oxygen Off" button to turn off the oxygen.

[0091] Connect oxygen and fuel gas to the fuel gas inlet of heater 4;

[0092] (V) Tempering treatment

[0093] After the welded joint of rail 5 has cooled to below 100°C, press the "Automatic" button. The tempering heat treatment device will automatically ignite and swing according to the set time until the tempering treatment is completed.

[0094] It should be noted that, unless otherwise specified, the above embodiments and features can be combined with each other.

[0095] The embodiments described above are merely examples of several implementation methods, and while their descriptions are specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model.

Claims

1. A tempering heat treatment device for welded joints of bainitic turnouts and pearlitic rails in field, comprising a fixed base structure (1), a cold water tank (2), an electrical control box (3), a geared motor (7), and an igniter (9), characterized in that: The tempering heat treatment device includes a heater (4) for heating the overheated zone of bainitic welding, a heater swing mechanism (8), and a heater centering mechanism (6); The fixed base structure (1) includes a front fixed plate (11) and a rear fixed plate (12). The front fixed plate (11) and the rear fixed plate (12) are vertically arranged. The lower section of the front fixed plate (11) and the rear fixed plate (12) has an opening structure that can be engaged with the rail (5). The front fixed plate (11) and the rear fixed plate (12) are connected by a horizontal adjustment steering plate (13). The rear end of the horizontal adjustment steering plate (13) has an adjustable connection hole. The horizontal adjustment steering plate (13) and the rear fixed plate (12) are connected by a horizontal locking bolt (14) through the connection hole. The opening structure of the rear fixed plate (12) is fixed to the rail (5) by a fixing bolt (123). The geared motor (7) is fixed to the rear section of the horizontal adjustment steering plate (13); A slide rail (15) is provided between the front fixing plate (11) and the rear fixing plate (12), and a slider (16) is provided on the slide rail (15); The heater swing mechanism (8) is a fixed connection between the shaft of the geared motor (7) and the rotating rod (81), the other end of the rotating rod (81) is hinged to the swing rod (82), and the other end of the swing rod (82) is connected to the pin of the vertically upward bracket (83) set on the slider (16); a connecting bracket (84) for fixing the heater (4) is provided on the lower side of the slider (16). When the geared motor (7) rotates, the rotating rod (81) drives the swing rod (82) to swing longitudinally along the rail (5), thereby driving the vertically upward bracket (83) on the slider (16), the slider (16) and the connecting bracket (84) of the heater (4) fixed on the lower side of the slider (16) to swing longitudinally along the rail (5), so that the heater (4) swings longitudinally along the rail (5); The cold water tank (2) is supplied with cold water by a pump; The electrical control box (3) is used to quantitatively control the flame size of the tempering heat treatment of the welded joint of the bainitic turnout and the pearlitic rail (5) on site, automatically ignite, swing the heater (4) longitudinally along the rail (5), quantitatively adjust the swing speed of the heater (4), and set the heating time. The igniter (9) on the heater (4) side is fixed by a connecting bracket (84).

2. The tempering heat treatment device for welded joints of bainitic turnouts and pearlitic rails in field according to claim 1, characterized in that, The heater (4) is divided into two independent parts: a left heater (41) and a right heater (42), which are fixed by the connecting bracket (84) of the heater (4) under the slider (16). The inner surface (44) of the heater (41) and the right heater (42) match the outer surface of the rail (5).

3. The tempering heat treatment device for welded joints of bainitic turnouts and pearlitic rails in field according to claim 2, characterized in that, The heater (4) includes a gas passage (48) and a circulating water passage (49); Gas is introduced into heater (4) in one direction through gas pipe (47). The inner surface (44) of heater is provided with flame holes (43). The flame holes (43) are distributed around the rail welding joint, so that the rail welding joint is heated. The heater (4) has a circulating water channel (49) inside. The circulating water channel (49) is provided with a circulating water channel (411) connecting the upper and lower parts. The heater (4) has an inlet connected to the inlet pipe (45) and an outlet connected to the outlet pipe (46) on the outside. The cold water tank (2) is connected to the heater (4) for water circulation cooling to prevent the heater (4) from overheating.

4. The tempering heat treatment device for welded joints of bainitic turnouts and pearlitic rails in field according to claim 3, characterized in that, The fire holes (43) are evenly distributed on the inner surface of the heater (4), so that the rail welding joint is heated evenly.

5. The tempering heat treatment device for welded joints of bainitic turnouts and pearlitic rails in field according to claim 4, characterized in that, The heater (4) has an external gas pipe (47), a water inlet pipe (45), and a water outlet pipe (46) that can be adjusted in direction to adapt to situations where the spacing between the turnout rails (5) is narrow. The water inlet pipe (45) and the water outlet pipe (46) are connected to the cold water tank (2).

6. The tempering heat treatment device for welded joints of bainitic turnouts and pearlitic rails in field according to claim 1, characterized in that, The heater centering mechanism (6) includes the fixed base structure (1) and the heater swing mechanism (8); The heater centering mechanism (6) completes the centering adjustment of the heater (4), including horizontal and vertical adjustment; The horizontal adjustment: the horizontal adjustment steering plate (13) rotates in the horizontal direction with the front fixed plate (11) as the fixed point, and the horizontal locking bolt (14) adjusts the horizontal alignment of the heater (4) around the welded joint of the rail (5) by the connecting bracket (84) of the heater swing mechanism (8); The vertical adjustment: The rear fixing plate (12) is provided with a bracket (121), and the bracket (121) is provided with a threaded hole. Adjust the distance between the vertical adjustment bolt (122) and the rail (5), and adjust the vertical alignment of the heater (4) around the welded joint of the rail (5) by the connecting bracket (84) of the heater swing mechanism (8).

7. The tempering heat treatment device for welded joints of bainitic turnouts and pearlitic rails in field according to claim 3, characterized in that, The fuel gas is a mixture of propane and oxygen or a mixture of liquefied petroleum gas and oxygen.

8. The tempering heat treatment device for welded joints of bainitic turnouts and pearlitic rails in field according to claim 5, characterized in that, The water inlet pipe (45), water outlet pipe (46), and gas pipe (47) at the external connector of the heater (4) are of a 90-degree structure.

9. The tempering heat treatment device for welded joints of bainitic turnouts and pearlitic rails in field according to any one of claims 1-8, characterized in that, The lower sections of the front fixing plate (11) and the rear fixing plate (12) have an inverted U-shaped opening structure that can be engaged with the rail (5); there is a gap between the two vertical sides of the U-shaped opening of the front fixing plate (11) and the rail (5); the rear fixing plate (12) is fixed to the rail (5) by bolts.

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