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

Abstract

The invention provides an on-site bainite turnout and pearlite steel rail welding joint tempering heat treatment device which comprises a fixed seat structure, a cold water tank, an electric control box, a speed reducing motor and an igniter, and further comprises a heater for heating a bainite welding overheating area, a heater swing 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. The invention further provides a welding joint tempering heat treatment method.

Description

Technical Field

[0001] The invention relates to the technical field of tempering heat treatment devices, and in particular to a tempering heat treatment device and method for on-site bainite turnout and pearlite rail welded joints. Background Art

[0002] At present, there are many reports on the known normalizing equipment and process for heat treatment of pearlite rail welded joints, and the heat treatment process for bainite rail welded joints. There are no relevant reports on the tempering heat treatment equipment for bainite turnout and pearlite rail welded joints.

[0003] Authorization announcement number CN 101761002 B provides a device for flame normalizing pearlite rail welded joints, wherein a heater of the device includes a plurality of fire holes. The heater surrounds the welded joint and is configured to heat treat the welded joint with gas through the plurality of fire holes. The heater is made of a metal having a thermal conductivity of not less than 350 W / (m·k) and having a heat conductivity of not less than 240,000 mm 2 The device comprises a support structure fixedly arranged relative to the rail, a heater according to the present invention and a sliding mechanism having a first end and a second end. The sliding mechanism is configured to be supported by the support structure and to slide in the extending direction of the rail. The heater is mounted on the sliding mechanism. The core of the device is to heat the pearlite rail weld joint to the austenitizing temperature and then air cool the weld joint so that the weld joint obtains refined austenite grains. Since the heater does not use water cooling, the structure is relatively simple, which is quite different from the present invention.

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

[0005] Application No. 201120260760.8 relates to a container-type rail normalizing equipment, which is used for on-site pearlite rail welding joint normalizing heat treatment, including rail medium frequency electric normalizing equipment, generator, container and auxiliary equipment, wherein the rail medium frequency electric normalizing equipment, generator and auxiliary equipment are fixed in the container, the equipment is large in size and weighs several tons, and it is difficult to use on site. Application No. 201120365185.8 and 202221714726.8 both relate to rail induction normalizing equipment, including medium frequency power supply, capacitor, transformer and normalizing coil, medium frequency power supply, capacitor, transformer and normalizing coil are connected in series in sequence; some normalizing equipment has variable frequency, the transformer is a transformer with variable turns ratio, or the capacitance of the capacitor can be changed. The above patents all involve induction heating of rails. Since induction heating is only suitable for heating temperatures above the Curie point of steel, that is, the austenitizing temperature, the material loses magnetism, and the heating efficiency decreases due to surface demagnetization is used to heat the core of the rail, thereby achieving a uniform heating effect inside and outside the rail. The tempering heat treatment heating temperature is lower than the Curie point, and it is difficult to achieve uniform temperature of the entire rail using induction heating. Therefore, it is not suitable for tempering heating.

[0006] All the above technologies only involve flame or induction normalizing heat treatment equipment for pearlite rail welding joints. The heating temperature and process are very different from the tempering of bainite turnout-pearlite rail welding joints. At present, the visible and usable bainite turnout and pearlite rail tempering heat treatment equipment is completely manual. The size of the heater flame is adjusted once by experience each time, there is no quantitative requirement, the time cannot be accurately timed, and the swing of the heater is judged by the human eye. All of these have large errors. Since the tempering temperature does not reach the red-hot state of the rail, the heat treatment error caused is also quite large. For this reason, it is necessary to develop a special tempering heat treatment equipment suitable for on-site bainite turnout and pearlite rail welding joints. Summary of the invention

[0007] The purpose of the present invention is to provide a tempering heat treatment device for on-site bainite turnout and pearlite rail welded joints, comprising a fixed seat structure, a cold water tank, an electrical control box, a reduction motor, an igniter, and the tempering heat treatment device comprises a heater for heating the bainite welding overheating zone, a heater swing mechanism, and a heater centering mechanism;

[0008] The fixing seat structure comprises a front fixing plate and a rear fixing plate, the front fixing plate and the rear fixing plate are arranged vertically, the lower sections of the front fixing plate and the rear fixing plate have an opening structure that can be clamped with the rail, the front fixing plate and the rear fixing plate are connected by a horizontal adjustment steering plate; the rear end of the horizontal adjustment steering plate has an adjustable connecting hole, the horizontal adjustment steering plate and the rear fixing plate are connected by a horizontal locking bolt through the connecting hole; the opening structure of the rear fixing plate is fixed to the rail by a fixing bolt;

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

[0010] A slide rail is provided between the front end fixing plate and the rear end fixing plate, and a slider is provided on the slide rail;

[0011] The heater swing mechanism is that the reduction motor shaft is fixedly connected to the rotating rod, the other end of the rotating rod is hinged to the swing rod, and the other end of the swing rod is connected to the vertically upward bracket pin arranged on the slider; a connecting bracket for fixing the heater is arranged on the lower side of the slider, and the reduction motor rotates, and the rotating rod drives the swing rod to swing longitudinally along the rail, thereby driving the vertically upward bracket on the slider, the slider and the connecting bracket of the heater fixed on the lower side of the slider to swing longitudinally along the rail, so that the heater swings longitudinally along the rail;

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

[0013] The electrical control box is used to quantitatively control the flame size during the on-site tempering heat treatment of the welded joints of the bainite turnout and the pearlite rail, automatically ignite, swing the heater along the longitudinal direction of the rail, quantitatively adjust the swing speed of the heater, and set the heating time;

[0014] The igniter on the heater side is fixed by a connecting bracket.

[0015] Furthermore, the heater is divided into two independent left and right parts, which are fixed by connecting brackets of the heaters on the lower side of the slider, and the inner profiles of the left and right heaters match the outer profiles of the rails.

[0016] Furthermore, the heater includes a gas channel and a circulating water channel inside;

[0017] The gas is passed into the heater in one direction from the gas pipe. The inner surface of the heater is provided with fire holes, which are distributed around the rail welding joints to heat the rail welding joints.

[0018] A circulating water channel is distributed inside the heater, and the circulating water channel is provided with upper and lower circulating water connecting channels. The outside of the heater has a water inlet connected to the water inlet pipe and a water outlet connected to the water outlet pipe. The cold water tank is connected to the heater for water circulation cooling to avoid overheating of the heater.

[0019] Furthermore, the fire holes are evenly distributed on the inner surface of the heater, so that the rail welding joint is heated evenly.

[0020] Furthermore, the external gas pipe, water inlet pipe and water outlet pipe of the heater can be adjusted in direction to adapt to the situation where the distance between turnout rails is narrow, and the water inlet pipe and water outlet pipe are connected to the cold water tank.

[0021] Further, the heater centering mechanism includes the fixed seat structure and the heater swinging mechanism;

[0022] The heater centering mechanism completes the heater centering adjustment including horizontal direction adjustment and vertical direction adjustment;

[0023] The horizontal adjustment: the horizontal adjustment steering plate rotates in the horizontal direction with the front end fixing plate as the fixing point, and the horizontal centering of the heater around the rail welding joint is adjusted by the horizontal locking bolt through the connecting bracket of the heater swing mechanism;

[0024] The vertical adjustment: the rear end fixing plate is provided with a bracket, the bracket is provided with a threaded hole, the distance between the vertical adjustment bolt and the rail is adjusted, and the vertical alignment of the heater around the rail welding joint is adjusted through the connecting bracket of the heater swing mechanism.

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

[0026] Furthermore, the water inlet pipe, water outlet pipe and gas pipe at the external joints of the heater are of a 90-degree structure.

[0027] Furthermore, the lower sections of the front and rear fixing plates have an opening structure that can be engaged with the rails, which is an inverted U-shaped opening; there is a gap between the two vertical sides of the U-shaped opening of the front fixing plate and the rails; the rear fixing plate is fixed to the rails by bolts.

[0028] The present invention also provides a method for on-site tempering heat treatment of a bainite turnout and pearlite rail welded joint, the on-site tempering heat treatment of a bainite turnout and pearlite rail welded joint comprising:

[0029] (I) Installation of tempering heat treatment equipment

[0030] After the welding of the bainite turnout and the pearlite rail is completed, the fixed seat structure of the tempering heat treatment device is installed on the rail according to the part of the weld joint that needs to be heated, and the fixing bolts of the rear end fixing plate are tightened in advance to fix the tempering heat treatment device on the rail head; the slide rail and the slider as well as the heater swing mechanism and the reduction motor are installed, and the heater is fixed through the heater connection bracket; the reduction motor is started, and the position of the heater relative to the weld joint is observed, so that the moving heater is aligned with the part of the weld joint that needs to be heated. If there is a deviation, the front and rear position is adjusted through the fixing bolts of the rear end fixing plate;

[0031] (II) Heater alignment adjustment

[0032] The horizontal adjustment steering plate rotates in the horizontal direction with the front fixed plate as the fixed point, and the horizontal locking bolts are used to make the heater horizontally centered around the rail welding joint;

[0033] Adjust the distance between the vertical adjustment bolt and the rail to center the heater in the vertical direction around the rail weld joint;

[0034] After centering adjustment, the rail welding joint is located at the center of the heater in the horizontal and vertical directions, so that the distance between the inner profile of the heater and the outer profile of the rail is uniform;

[0035] (III) Setting tempering parameters

[0036] Set the heater swing speed and heating time parameters;

[0037] (IV) Connect water circulation pipelines, gas and oxygen pipelines, and check water circulation, gas and oxygen

[0038] Connect the water pump power plug to the electrical control box of the tempering heat treatment device, and connect the tempering heat treatment device to the AC220V power supply;

[0039] Connect oxygen and fuel gas to the heater fuel gas inlet;

[0040] Check whether there is water in the cold water tank, whether the water pump is turned on normally, whether the water pipe joints are leaking, and whether the return pipe is returning water normally;

[0041] 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", 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;

[0042] Connect oxygen and fuel gas to the heater fuel gas inlet;

[0043] (V) Tempering treatment

[0044] When the rail welding joint cools down to below 100℃, press the "Auto" button, and the tempering heat treatment device will automatically ignite and swing according to the set time until the tempering treatment is completed.

[0045] The beneficial effects of the present invention are:

[0046] The tempering heat treatment device for the welded joint of bainite turnout and pearlite rail of the present invention is automatically carried out, the size of the heater flame is not adjusted by experience, and has quantitative requirements, the tempering time can be accurately timed, the swing stroke of the heater is not judged by human eyes, and the error is small. Since the tempering temperature reaches the red-hot state of the rail and the heating is uniform, the tempering heat treatment device for the welded joint of bainite turnout and pearlite rail of the present invention develops a special tempering heat treatment equipment suitable for on-site bainite turnout and pearlite rail welded joints. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1It is a three-dimensional schematic diagram of a turnout bainite-pearlite tempering heat treatment device of the present invention;

[0048] Figure 2 It is a schematic diagram of the heater of the present invention;

[0049] Figure 3 It is a schematic diagram of the internal structure of the heater of the present invention;

[0050] Figure 4 It is a three-dimensional schematic diagram of the heater swing mechanism of the present invention;

[0051] Figure 5 It is another three-dimensional schematic diagram of the heater swing mechanism of the present invention;

[0052] Figure 6 It is a three-dimensional schematic diagram of the heater centering mechanism of the present invention;

[0053] Figure 7 This is a schematic diagram of the horizontal centering adjustment of the heater of the present invention;

[0054] Figure 8 It is a schematic diagram of the electrical control box of the present invention;

[0055] Fig. 9 It is a schematic diagram of the tempering area of ​​the present invention.

[0056] in:

[0057] 1—fixed seat 11—front end fixing plate 12—rear end fixing plate

[0058] 121—Bracket 122—Vertical adjustment bolt 123—Fixing bolt

[0059] 13—Horizontal adjustment steering plate 14—Horizontal locking bolt 15—Slide rail 16—Slider

[0060] 2—Cold water tank 3—Electrical control box

[0061] 4—Heater

[0062] 41 - heater on the left side 42 - heater on the right side 43 - fire hole 44 - inner surface of heater

[0063] 45—water inlet pipe 46—water outlet pipe 47—gas pipe

[0064] 48—gas channel 49—circulating water channel 411—circulating water upper and lower connecting channels

[0065] 5—rail 6—igniter heater centering mechanism 7—reduction motor

[0066] 8—Heater swing mechanism

[0067] 81 - rotating rod 82 - swing rod 83 - bracket 84 - connecting bracket

[0068] 9—Ignition device. DETAILED DESCRIPTION

[0069] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the following is a further detailed description of the on-site bainite turnout and pearlite rail welded joint tempering heat treatment device of the present invention in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0070] A device for tempering heat treatment of welded joints of bainite turnout and pearlite rail on site, referring to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Fig. 9 As shown, it includes a fixed seat structure 1, a cold water tank 2, an electrical control box 3, a reduction motor 7, an igniter 9, and the tempering heat treatment device includes a heater 4 for heating the bainite welding overheating zone, a heater swing mechanism 8, and a heater centering mechanism 6;

[0071] The fixing seat structure 1 comprises a front fixing plate 11 and a rear fixing plate 12, the front fixing plate 11 and the rear fixing plate 12 are vertically arranged, the lower sections of the front fixing plate 11 and the rear fixing plate 12 have an opening structure that can be engaged with the rail 5, the front fixing plate 11 and the rear fixing plate 12 are connected by a horizontal adjustment steering plate 13; the rear end of the horizontal adjustment steering plate 13 has an adjustable connecting hole, the horizontal adjustment steering plate 13 and the rear fixing plate 12 are connected by a horizontal locking bolt 14 through the connecting hole; the opening structure of the rear fixing plate 12 is fixed to the rail 5 by a fixing bolt 123;

[0072] The reduction motor 7 is fixed to the rear section of the horizontal adjustment steering plate 13;

[0073] A slide rail 15 is provided between the front end fixing plate 11 and the rear end fixing plate 12, and a slider 16 is provided on the slide rail 15;

[0074] The heater swing mechanism 8 is that the shaft of the reduction motor 7 is fixedly connected to 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 pin-connected to the vertically upward bracket 83 arranged on the slider 16; a connecting bracket 84 for fixing the heater 4 is arranged on the lower side of the slider 16, and the rotation of the reduction motor 7 drives the swing rod 81 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;

[0075] The cold water tank 2 provides a cold water source through a pump;

[0076] The electrical control box 3 performs quantitative control of the flame size for tempering heat treatment of the welding joint between the bainite turnout and the pearlite rail 5 on site, automatically ignites, the heater 4 swings longitudinally along the rail 5, the swing speed of the heater 4 is quantitatively adjusted, and the heating time is set;

[0077] The igniter 9 on the heater 4 side is fixed by a connecting bracket 84 .

[0078] The cold water tank 2 is connected to the heater 4 via a water inlet pipe 45 and a water outlet pipe 46 , and a pump provides power to circulate cold water in the heater 4 .

[0079] Preferably, see Figure 1 , Figure 2 , Figure 3 , Figure 5 , Figure 7 As shown, the heater 4 is divided into two independent parts, a left heater 41 and a right heater 42, which are respectively fixed by the connecting bracket 84 of the heater 4 on the lower side of the slider 16, and the inner surface 44 of the left heater 41 and the right heater 42 matches the outer surface of the rail 5.

[0080] Preferably, see Figure 2 , Figure 3 , Figure 5 , Figure 7 As shown, the heater 4 includes a gas channel 48 and a circulating water channel 49;

[0081] The gas is passed into the heater 4 in one direction through the gas pipe 47. The inner profile 44 of the heater is provided with fire holes 43. The fire holes 43 are distributed around the rail welding joint, so that the rail welding joint is heated.

[0082] A circulating water channel 49 is distributed inside the heater 4, and the circulating water channel 49 is provided with upper and lower circulating water connecting channels 411. The outside of the heater 4 has a water inlet connected to the water inlet pipe 45 and a water outlet connected to the water outlet pipe 46. The cold water tank 2 is connected to the heater 4 for water circulation cooling to prevent the heater 4 from overheating.

[0083] 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.

[0084] Preferably, see Figure 2 , Figure 3 , Figure 5 , Figure 7 As shown, the external gas pipe 47 of the heater 4 and the water inlet pipe 45 and the water outlet pipe 46 can be adjusted in direction to adapt to the situation where the spacing between the turnout rails 5 is narrow, and the water inlet pipe 45 and the water outlet pipe 46 are connected to the cold water tank 2.

[0085] See also Figure 1 , Figure 4 , Figure 5 , Figure 6 , Figure 7 As shown, the heater centering mechanism 6 includes the fixing seat structure 1 and the heater swinging mechanism 8;

[0086] The heater centering mechanism 6 completes the centering adjustment of the heater 4 including horizontal adjustment and vertical adjustment;

[0087] 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 centering of the heater 4 around the welded joint of the rail 5 through the connecting bracket 84 of the heater swing mechanism 8;

[0088] Figure 7 In the example of the horizontal rotation, the horizontal adjustment steering plate is rotated to drive the heater to rotate in one direction, and the same is true for the reverse direction.

[0089] The vertical adjustment: the rear end 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 welding joint of the rail 5 is adjusted through the connecting bracket 84 of the heater swing mechanism 8.

[0090] In fact, the front fixing plate 11 of the fixing seat structure 1, the horizontal adjustment steering plate 13, the horizontal locking bolt 14, the slide rail 15 provided between the front fixing plate 11 and the rear fixing plate 12, the slide rail 15 provided with a slider 16, and the rotating rod 81, the swing rod 82, the bracket 83, the connecting bracket 84 of the heater swing mechanism 8 are all involved in the centering adjustment of the heater 4. Objectively, the reduction motor 7, the rotating rod 81, the swing rod 82, and the bracket 83 fixed to the horizontal adjustment steering plate 13 also play a certain stabilizing role in the centering adjustment process of the heater 4.

[0091] The function of the heater centering mechanism 6 is to achieve a uniform circumferential distance between the heater 4 and the rail 5 .

[0092] Preferably, the fuel gas is a mixture of propane and oxygen or a mixture of liquefied gas and oxygen.

[0093] Of course, the fuel gas itself is propane or liquefied gas, and oxygen is added to ensure more complete combustion. Before entering the heater 4, it is mixed.

[0094] See also Figure 1 , Figure 2 , Figure 3 , Figure 5 , Figure 7 As shown, the water inlet pipe 45, the water outlet pipe 46 and the gas pipe 47 at the external joint of the heater 4 are in a 90-degree structure. In this way, it can better adapt to the situation where the track spacing is small during on-site construction.

[0095] Preferably, see Figure 1 , Figure 5 , Figure 6 , Figure 7 As shown, the lower sections of the front fixing plate 11 and the rear fixing plate 12 have an opening structure that can be connected with the rail 5, which is an inverted U-shaped opening; 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. The gap between the two vertical sides of the U-shaped opening of the front fixing plate 11 and the rail 5 is to enable the horizontal adjustment steering plate 13 to rotate around the front fixing plate 11 when rotating, so as to adjust the gap between the heater 4 and the welding joint in the horizontal direction. It is more appropriate to have a gap of 1 to 2 mm between the two vertical sides of the U-shaped opening of the front fixing plate 11 and the rail 5.

[0096] In another embodiment, the present invention provides a method for on-site tempering heat treatment of a welded joint of a bainite turnout and a pearlite rail, wherein the on-site tempering heat treatment of a welded joint of a bainite turnout and a pearlite rail 5 comprises:

[0097] (I) Installation of tempering heat treatment equipment

[0098] After the welding of the bainite turnout and the pearlite rail is completed, 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, and the fixing bolts 123 of the rear end fixing plate 12 are tightened in advance, so that the tempering heat treatment device is fixed to 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, and 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 front and rear position is adjusted by the fixing bolts 123 of the rear end fixing plate 12;

[0099] (II) Centering adjustment of heater 4

[0100] 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 is used to horizontally center the heater 4 around the welded joint of the rail 5;

[0101] Adjust the distance between the vertical adjustment bolt 122 and the rail 5 so that the heater 4 is centered in the vertical direction around the welded joint of the rail 5;

[0102] After centering adjustment, the rail welding joint is located at the center of the heater 4 in the horizontal and vertical directions, so that the distance between the inner profile of the heater 4 and the outer profile of the rail 5 is uniform;

[0103] (III) Setting tempering parameters

[0104] Set the swing speed and heating time parameters of heater 4;

[0105] (IV) Connect water circulation pipelines, gas and oxygen pipelines, and check water circulation, gas and oxygen

[0106] 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 the AC220V power supply;

[0107] Connect oxygen and fuel gas to the fuel gas inlet of heater 4;

[0108] Check whether there is water in the cold water tank 2, whether the water pump is turned on normally, whether the water pipe joints are leaking, and whether the return pipe returns water normally;

[0109] 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", 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;

[0110] Connect oxygen and fuel gas to the fuel gas inlet of heater 4;

[0111] (V) Tempering treatment

[0112] When the temperature of the welded joint of rail 5 cools down to below 100°C, press the "Auto" button, and the tempering heat treatment device will automatically ignite and swing according to the set time until the tempering treatment is completed.

[0113] It should be noted that, in the absence of conflict, the above embodiments and features therein may be combined with each other.

[0114] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A device for tempering heat treatment of welding joints of bainite turnout and pearlite rail on site, comprising a fixing seat structure (1), a cold water tank (2), an electrical control box (3), a reduction motor (7), and an igniter (9), characterized in that: The tempering heat treatment device comprises a heater (4) for heating a bainite welding overheating zone, a heater swinging mechanism (8), and a heater centering mechanism (6); The fixing seat structure (1) comprises a front fixing plate (11) and a rear fixing plate (12), the front fixing plate (11) and the rear fixing plate (12) being arranged vertically, the lower sections of the front fixing plate (11) and the rear fixing plate (12) having an opening structure capable of being clamped with a steel rail (5), the front fixing plate (11) and the rear fixing plate (12) being connected by a horizontal adjustment steering plate (13); the rear end of the horizontal adjustment steering plate (13) having an adjustable connection hole, the horizontal adjustment steering plate (13) and the rear fixing plate (12) being connected by a horizontal locking bolt (14) through the connection hole; the opening structure of the rear fixing plate (12) being fixed to the steel rail (5) by a fixing bolt (123); The reduction motor (7) is fixed to the rear section of the horizontal adjustment steering plate (13); A slide rail (15) is provided between the front end fixing plate (11) and the rear end fixing plate (12), and a slider (16) is provided on the slide rail (15); The heater swing mechanism (8) is a structure in which the shaft of the reduction motor (7) is fixedly connected to a rotating rod (81), the other end of the rotating rod (81) is hinged to a swing rod (82), and the other end of the swing rod (82) is pin-connected to a vertically upward bracket (83) arranged on a slider (16); a connecting bracket (84) for fixing the heater (4) is arranged on the lower side of the slider (16); when the reduction 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) provides a cold water source via a pump; The electrical control box (3) performs quantitative control of the flame size during the on-site tempering heat treatment of the welded joints of the bainite turnout and the pearlite rail (5), automatically ignites, causes the heater (4) to swing longitudinally along the rail (5), quantitatively adjusts the swing speed of the heater (4), and sets the heating time; The igniter (9) on the heater (4) side is fixed by a connecting bracket (84).

2. The device for tempering heat treatment of on-site bainite turnout and pearlite rail welded joints according to claim 1 is characterized in that: The heater (4) is divided into two independent parts, a left heater (41) and a right heater (42), which are respectively fixed by connecting brackets (84) of the heater (4) on the lower side of the slider (16); the inner profiles (44) of the left heater (41) and the right heater (42) match the outer profiles of the rail (5).

3. The device for tempering heat treatment of on-site bainite turnout and pearlite rail welded joints according to claim 2 is characterized in that: The heater (4) includes a gas channel (48) and a circulating water channel (49) inside; The gas is introduced into the heater (4) in one direction through a gas pipe (47); the inner profile (44) of the heater is provided with fire holes (43); the fire holes (43) are distributed around the rail welding joint, so that the rail welding joint is heated; A circulating water channel (49) is distributed inside the heater (4), and the circulating water channel (49) is provided with a circulating water upper and lower connecting channel (411). The heater (4) is provided with a water inlet connected to a water inlet pipe (45) and a water outlet connected to a water outlet pipe (46) 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 device for tempering heat treatment of on-site bainite turnout and pearlite rail welded joints according to claim 3 is 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 device for tempering heat treatment of on-site bainite turnout and pearlite rail welded joints according to claim 4 is characterized in that: The external gas pipe (47) and the water inlet pipe (45) and the water outlet pipe (46) of the heater (4) can be adjusted in direction to adapt to the situation 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 device for tempering heat treatment of on-site bainite turnout and pearlite rail welded joints according to claim 1, characterized in that: The heater centering mechanism (6) comprises the fixed seat structure (1) and the heater swinging mechanism (8); The heater centering mechanism (6) completes the centering adjustment of the heater (4) including horizontal adjustment and vertical adjustment; The horizontal adjustment: the horizontal adjustment steering plate (13) rotates in the horizontal direction with the front end fixing plate (11) as a fixed point, and the horizontal locking bolt (14) is used to adjust the horizontal centering of the heater (4) around the welding joint of the rail (5) through the connecting bracket (84) of the heater swing mechanism (8); The vertical direction adjustment: the rear end fixing plate (12) is provided with a bracket (121), 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 direction alignment of the heater (4) around the welded joint of the rail (5) is adjusted through the connecting bracket (84) of the heater swing mechanism (8).

7. The device for tempering heat treatment of on-site bainite turnout and pearlite rail welded joints according to claim 3, characterized in that: The fuel gas is a mixture of propane and oxygen or a mixture of liquefied gas and oxygen.

8. The device for tempering heat treatment of on-site bainite turnout and pearlite rail welded joints according to claim 5, characterized in that: The water inlet pipe (45), the water outlet pipe (46) and the gas pipe (47) at the external joints of the heater (4) are in a 90-degree structure.

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

10. A method for on-site tempering heat treatment of bainite turnout and pearlite rail welded joints, characterized in that: On-site tempering heat treatment of the welded joints of bainite turnout and pearlite rail (5) includes: (I) Installation of tempering heat treatment equipment After the welding of the bainite turnout and the pearlite rail is completed, the fixed 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, and the fixing bolts (123) of the rear end fixing plate (12) are tightened in advance so that the tempering heat treatment device is fixed to 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, and 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 front and rear position is adjusted by the fixing bolts (123) of the rear end fixing plate (12); (ii) Centering adjustment of heater (4) The horizontal adjustment steering plate (13) rotates in the horizontal direction with the front end fixing plate (11) as a fixed point, and the horizontal locking bolt (14) is used to horizontally center the heater (4) around the welding joint of the rail (5); Adjust the distance between the vertical adjustment bolt (122) and the steel rail (5) so that the heater (4) is centered in the vertical direction around the welded joint of the steel rail (5); After centering adjustment, the rail welding joint is located at the center of the heater (4) in the horizontal and vertical directions, so that the distance between the inner profile of the heater (4) and the outer profile of the rail (5) is uniform; (III) Setting tempering parameters Setting the swing speed and heating time parameters of the heater (4); (IV) Connect water circulation pipelines, gas and oxygen pipelines, and check water circulation, gas and oxygen 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; Connect oxygen and fuel gas to the fuel gas inlet of the heater (4); Check whether there is water in the cold water tank (2), whether the water pump is turned on normally, whether the water pipe joints are leaking, and whether the return pipe is returning water normally; Check the oxygen and gas solenoid valves: press the "Gas On" button, then press and hold the "Ignition" button until the gas ignites, release "Ignition", and then press "Gas Off" 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 "Oxygen Off" to turn off the oxygen; Connect oxygen and fuel gas to the fuel gas inlet of the heater (4); (V) Tempering treatment When the welded joint of the rail (5) cools down to below 100°C, the "auto" button is pressed, and the tempering heat treatment device automatically ignites and swings according to the set time until the tempering treatment is completed.

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