Medium-frequency induction heating device

Abstract

The utility model discloses a medium-frequency induction heating device, comprising a medium-frequency power supply which is an induction heating power supply based on high-speed DSP chip control; the output transformer is connected with the medium-frequency power supply; a cantilever crane; the heating device comprises an induction heating coil connected with the output transformer, and the induction heating coil is mounted on the cantilever crane; the far infrared temperature measurement system and the induction heating coil are integrally designed; and the industrial constant-temperature water cooler is respectively connected with the output transformer, the medium-frequency power supply and the induction heating coil. The preheating device changes the preheating mode of top bending in a steel rail factory, the whole process is automatically controlled, the possibility of uncontrollable factors existing in manual operation is eliminated, it is ensured that the temperature meets the process requirement, heating is safe, efficient and uniform, steel rail breaking is avoided, the rejection rate is reduced, and the preheating device has popularization value in the industry.

Description

Technical Field

[0001] The utility model belongs to the technical field of railway tracks and relates to a medium frequency induction heating device. Background Art

[0002] With the development of railway transportation, the weight of high-speed rail traction, transportation density, and annual throughput have gradually increased, significantly increasing the load on the tracks. To extend the service life of the tracks, new requirements have been placed on the strength and hardness of the rails. Railway practice around the world has proven that heat treatment of rails is the most effective and economical measure to improve the strength and toughness of rail materials.

[0003] Patent number CN113293661A, utility model patent named "Portable Rail Heating Box" discloses a portable rail heating box, including a box body, the inside of the box body is provided with a filling insulation material, the inside of the filling insulation material is provided with a left contoured ceramic heating tube and a right contoured ceramic heating tube, the contoured shapes of the left contoured ceramic heating tube and the right contoured ceramic heating tube are the same as the shape of the rail to be heated, and one of the contoured ceramic heating tubes is provided with a temperature measuring hole. The shortcoming of this heating box is that it is subject to the characteristics of the heating element and the heating method. Compared with medium-frequency induction heating, its heating efficiency is lower and its service life is shorter. Utility Model Content

[0004] The utility model aims to provide a medium frequency induction heating device, which solves the problem that the existing heating box adopts the heating method of the contoured ceramic heating tube, which has low heating efficiency and short service life.

[0005] The technical solution adopted by the present invention is a medium frequency induction heating device, comprising:

[0006] Medium frequency power supply is an induction heating power supply controlled by a high-speed DSP chip;

[0007] Output transformer, connected to the medium frequency power supply;

[0008] Cantilever crane;

[0009] A heating device comprising:

[0010] The induction heating coil is connected to the output transformer and is installed on the cantilever crane;

[0011] Far infrared temperature measurement system, integrated with induction heating coil;

[0012] The industrial constant temperature chiller is connected to the output transformer, medium frequency power supply and induction heating coil respectively.

[0013] The utility model is also characterized in that:

[0014] Furthermore, the medium frequency power supply is 120KW / 0.2~50KHZ.

[0015] Furthermore, the medium frequency power supply can adapt to the power grid fluctuation range of -20% to +10%.

[0016] Furthermore, the induction heating coil includes a coil portion, which is composed of a plurality of conductor tubes. The conductor tubes are formed of metal conductors, and the conductor tubes are wound along a U-shaped track into a cap-shaped structure.

[0017] Furthermore, the cap shape is a non-enclosed structure, the coil portion has three planes, an opening is provided at the lower end of the coil portion, the workpiece enters the inner side of the induction heating coil from the lower end opening, and the three planes are parallel to the workpiece surface.

[0018] Furthermore, the area between the multi-layered conductive tubes is divided into a plurality of blocks, and sensors for measuring the heating state of the heated object are arranged between the plurality of blocks.

[0019] Furthermore, the cross section of the conductor tube is elliptical.

[0020] Furthermore, the surface of the conductor tube is coated with an insulating layer.

[0021] The beneficial effects of the present invention are: changing the preheating method of the top bend of the rail in the factory (compared with the traditional diffusion heating torque), automatically controlling the entire process, eliminating the possibility of uncontrollable factors in manual operation, ensuring that the temperature meets the process requirements, heating is safe, efficient and uniform, avoiding rail breakage, reducing the scrap rate, and having promotion value in the industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 It is a structural diagram of the utility model;

[0024] Figure 2 It is a left view of the utility model;

[0025] Figure 3 It is a top view of the utility model;

[0026] Figure 4 This is a schematic diagram of the structure of the coil part of the utility model

[0027] Figure 5 It is a front view of the coil portion of the present invention;

[0028] Figure 6 It is a left side view of the coil portion of the present invention;

[0029] Figure 7 This is a top view of the coil portion of the present invention

[0030] In the figure, 1. Medium frequency power supply, 2. Cantilever crane, 3. Heating device, 4. Industrial constant temperature chiller, 5. Coil unit. DETAILED DESCRIPTION

[0031] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] The following is combined with Figure 1 To the attached Figure 7 And specific embodiments, the utility model is discussed in detail:

[0033] A medium frequency induction heating device, the structure of which is as follows Figures 1 to 3 As shown, including:

[0034] Medium frequency power supply 1 is an induction heating power supply controlled by a high-speed DSP chip;

[0035] An output transformer connected to the intermediate frequency power supply 1;

[0036] Cantilever crane 2;

[0037] The heating device 3 comprises:

[0038] an induction heating coil connected to the output transformer, and the induction heating coil is installed on the cantilever crane 2;

[0039] The far-infrared temperature measurement system is integrated with the induction heating coil and is installed on a cantilever crane. The cantilever crane can move the entire heating device. When in use, the heating device can be directly adjusted to the position where the rail needs to be heated using remote control, which is convenient and labor-saving.

[0040] The temperature system monitors the rail temperature in real time. When the heating temperature reaches the equipment temperature, the far-infrared temperature measurement system feeds back a signal to the intermediate frequency power supply, forming a closed-loop control with the intermediate frequency power supply to keep the rail in a heat-insulating and uniform temperature state. When the set time is reached, the intermediate frequency power supply stops heating.

[0041] The specific parameters of the medium frequency power supply 1 are shown in Table 1. It can be seen from Table 1 that the frequency tracking range of the power supply can be adaptively adjusted from 0.2 kHz to 50 kHz without changing the hardware circuit. The IGBT zero-crossing switching can be guaranteed in any frequency band and the power grid fluctuation range of -20% to +10% can be adapted. The output operating value is not affected by the power grid voltage fluctuation.

[0042] Table 1

[0043]

[0044]

[0045] An industrial constant-temperature water chiller 4 is connected to the output transformer, the intermediate-frequency power supply 1, and the induction heating coil. The industrial constant-temperature water chiller 4 is used to cool the power supply and the inductor. The specific parameters of the industrial constant-temperature water chiller 4 are shown in Table 2.

[0046] Table 2

[0047]

[0048]

[0049] In this embodiment, the rail top bending is performed by a hydraulic press at a fixed position, so the medium frequency induction heating device is installed near the hydraulic press.

[0050] Furthermore, the induction heating coil includes a coil portion 5, the structure of which is shown in Figures 4 to 7. The coil portion is composed of a plurality of conductor tubes, each of which is formed of a metal conductor and is wound along a U-shaped track into a cap-shaped structure.

[0051] Furthermore, the cap shape is a non-closed structure. The coil portion 5 has three planes in total. An opening is provided at the lower end of the coil portion 5. The workpiece enters the inner side of the induction heating coil from the lower end opening. The three planes are parallel to the surface of the workpiece. The workpiece enters the inner side of the induction heating coil from the lower end opening. The induction heating coil as a whole adopts a cap-shaped design that matches the shape of the workpiece. The induction heating coil can heat the heating position of the workpiece from three sides.

[0052] Furthermore, the area between the multi-layered conductive tubes is divided into a plurality of blocks, and sensors for measuring the heating state of the heated object are provided.

[0053] Furthermore, the cross section of the conductor tube is elliptical.

[0054] Furthermore, the surface of the conductor tube is coated with an insulating layer.

[0055] The utility model is a medium frequency induction heating device, and its working process is as follows:

[0056] Startup and Connection: The medium-frequency power supply (controlled by a high-speed DSP chip) is powered on and connected to the output transformer, providing power to the entire heating system. The heating device on the cantilever crane (including the induction heating coil and far-infrared temperature measurement system) is ready and awaiting operational instructions. The industrial constant-temperature chiller is connected to the medium-frequency power supply, output transformer, and induction heating coil to ensure system cooling.

[0057] Heating Operation: The operator uses a remote control to move the heating device to the rail location where heating is required. The induction heating coil receives electrical energy through the output transformer, generating an alternating magnetic field that induces eddy currents in the rail, achieving heating. A far-infrared temperature measurement system monitors rail temperature in real time and feeds this data back to the medium-frequency power supply.

[0058] Temperature Control: When the rail temperature reaches the set value, the far-infrared temperature measurement system sends a signal to the IF power supply, forming a closed-loop control system. The IF power supply adjusts its output power based on the feedback signal to keep the rail warm and at a constant temperature. The IF power supply stops heating after the set heating time has expired.

[0059] Cooling and Ending: The industrial constant temperature chiller continues to operate to ensure the cooling of the medium frequency power supply, output transformer and induction heating coil. After heating is completed, the cantilever crane moves the heating device back to its original position to prepare for the next heating operation.

[0060] The utility model provides a medium frequency induction heating device, which has the following advantages:

[0061] This innovative medium-frequency induction heating method offers high heating efficiency and can quickly heat rails to the desired temperature. Compared to traditional diffusion heating methods, medium-frequency induction heating heats rails more directly and evenly. Furthermore, the rational design of key components, such as the heat source and induction heating coils, ensures a long service life and reduces maintenance costs.

[0062] The heating unit is mounted on a cantilever crane, allowing for convenient and labor-saving adjustment of the heating position via remote control. A far-infrared temperature measurement system and a medium-frequency power supply form a closed-loop control loop, automating and intelligentizing the heating process. Furthermore, the heating coil features an open, flat, cap-shaped design that matches the rail shape, ensuring uniform heating and minimizing damage. An industrial constant-temperature chiller ensures system cooling, preventing damage from overheating.

[0063] The whole process is automatically controlled, eliminating the uncontrollable factors of manual operation, ensuring that the temperature meets the process requirements and reducing the scrap rate. In summary, this medium-frequency induction heating device has significant advantages and broad application prospects in the field of railway track technology.

[0064] The above further describes the present invention with the help of specific embodiments, but it should be understood that the specific description here should not be construed as limiting the essence and scope of the present invention. Various modifications made to the above embodiments by ordinary technicians in this field after reading this specification are all within the scope of protection of the present invention.

Claims

1. A medium frequency induction heating device, characterized in that: include: The medium frequency power supply (1) is an induction heating power supply controlled by a high-speed DSP chip; an output transformer connected to the intermediate frequency power supply (1); Cantilever crane (2); The heating device (3) comprises: an induction heating coil connected to the output transformer, wherein the induction heating coil is mounted on the cantilever crane (2); A far-infrared temperature measurement system is integrated with the induction heating coil; An industrial constant temperature water chiller (4) is connected to the output transformer, the medium frequency power supply (1), and the induction heating coil, respectively.

2. The medium frequency induction heating device according to claim 1, characterized in that: The medium frequency power supply (1) is 120KW / 0.2-50KHZ.

3. The medium frequency induction heating device according to claim 1, characterized in that: The medium frequency power supply (1) is adaptable to a power grid fluctuation range of -20% to +10%.

4. The medium frequency induction heating device according to any one of claims 1 to 3, characterized in that: The induction heating coil comprises a coil portion (5), wherein the coil portion (5) is composed of a plurality of conductor tubes, wherein the conductor tubes are formed of metal conductors and are wound along a U-shaped track into a cap-shaped structure.

5. The medium frequency induction heating device according to claim 4, characterized in that: The cap shape is a non-enclosed structure, the coil part (5) has three planes, the lower end of the coil part (5) is provided with an opening, the workpiece enters the inner side of the induction heating coil from the lower end opening, and the three planes are parallel to the surface of the workpiece.

6. The medium frequency induction heating device according to claim 5, characterized in that: The area between the multilayer conductor tubes is divided into a plurality of blocks, and sensors for measuring the heating status of the heated object are arranged between the blocks.

7. The medium frequency induction heating device according to claim 5, characterized in that: The cross section of the conductor tube is elliptical.

8. The medium frequency induction heating device according to claim 5, characterized in that: The surface of the conductor tube is coated with an insulation layer.

Images