Galvanized steel sheet heat treatment equipment

Abstract

The utility model discloses galvanized steel plate heat treatment equipment, belongs to the technical field of steel plate heat treatment, and solves the problems that when the existing steel plate heat treatment equipment is used for carrying out induction heating on a steel plate, the heating quantity is the same when the steel plate with any thickness and width is heated due to the fact that the current is generally kept unchanged. For thin steel plates, the problem of excessive heating may be caused. Comprising a machine shell and a conveying mechanism arranged in the machine shell. When the device is used, a steel plate enters the shell through the conveying mechanism and is subjected to heat treatment through the induction heating coil. The coil control circuit detects the thickness and the width of the steel plate. The width detection module outputs a voltage signal in direct proportion to the width through magnetic field changes. The thickness detection module converts the voltage signal into a voltage signal in inverse proportion to the thickness through a current phase difference. The signals are synthesized to generate comprehensive control voltage, the current amplitude of the induction coil is adjusted, closed-loop control is formed, and excessive heating of the steel plate is avoided.

Description

Technical Field

[0001] This utility model relates to the field of steel plate heat treatment technology, and in particular to a heat treatment equipment for galvanized steel plates. Background Technology

[0002] Galvanized steel sheet is a type of steel sheet coated with a layer of zinc, primarily produced through hot-dip galvanizing or electro-galvanizing processes. The zinc layer effectively prevents the steel sheet from rusting, significantly improving its corrosion resistance and extending its service life. It has excellent processing properties, allowing for stamping, welding, cutting, and other processing methods to meet the needs of various applications. Furthermore, galvanized steel sheet is used in power equipment, transportation facilities, agricultural machinery, and other fields, becoming an indispensable material in modern industry due to its superior corrosion resistance and good mechanical properties.

[0003] When processing galvanized steel sheets, heat treatment is required. The specific heat treatment method is to heat the steel sheet for a short period of time using induction heating. However, current steel sheet heat treatment equipment usually maintains a constant current when induction heating the steel sheet, which means that the amount of heat is the same regardless of the thickness and width of the steel sheet. For thinner steel sheets, this may cause overheating.

[0004] Therefore, a heat treatment device for galvanized steel sheets is proposed to solve or alleviate the above problems. Utility Model Content

[0005] The purpose of this utility model is to address the shortcomings of existing technologies by proposing a heat treatment device for galvanized steel sheets.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A heat treatment device for galvanized steel sheet includes a housing, a transport mechanism disposed within the housing, and an induction heating coil located within the housing and on the outer ring of the transport mechanism. The induction heating coil is coupled to a coil control circuit, which can collect the width and thickness of the steel sheet on the transport mechanism and control the current flowing through the induction heating coil.

[0008] Preferably, the coil control circuit includes a power supply module, a main power channel, a thickness detection module, a width detection module, a signal synthesis module, and a power control module;

[0009] The output terminal of the power module is connected to the input terminal of the main power channel, and it is used to convert AC power into stable DC power.

[0010] The output terminal of the main power channel is connected to the induction heating coil, and its resonant circuit is connected to the current sampling terminal of the thickness detection module.

[0011] The output terminals of the width detection module and the thickness detection module are coupled to the input terminal of the signal synthesis module;

[0012] The output of the signal synthesis module is connected to the reference voltage input of the power control module;

[0013] The feedback input terminal of the power control module is connected to the output terminal of the main power channel through a current sampling circuit, and the drive output terminal of the power control module is connected to the control terminal of the power switching device of the main power channel.

[0014] Preferably, the power supply module includes a three-phase rectifier bridge GBPC3506W and a parallel electrolytic capacitor bank. The AC input terminal of the three-phase rectifier bridge GBPC3506W is connected to a three-phase AC power supply, the DC positive output terminal of the three-phase rectifier bridge GBPC3506W is connected to the positive bus of the electrolytic capacitor bank, and the DC negative output terminal of the three-phase rectifier bridge GBPC3506W is grounded.

[0015] Preferably, the main power channel includes a full-bridge IGBT module FF450R12KE3 and a resonant capacitor bank. The DC positive terminal of the full-bridge IGBT module FF450R12KE3 is connected to the positive terminal of the electrolytic capacitor bank, the DC negative terminal of the full-bridge IGBT module FF450R12KE3 is grounded, and the AC output terminal of the full-bridge IGBT module FF450R12KE3 is connected to both ends of the induction heating coil via the resonant capacitor bank.

[0016] Preferably, the thickness detection module includes a current transformer, a phase detector AD8302, a voltage sampling divider network, and an integrator circuit. The current transformer is coupled to the phase detector AD8302, the voltage sampling divider network is coupled to the phase detector AD8302, and the phase detector AD8302 is coupled to the integrator circuit and outputs a thickness voltage signal through the integrator circuit.

[0017] Preferably, the width detection module includes a transmitting coil, a receiving coil, a MOSFET IRF640, a high-frequency oscillator CD4046, a full-wave rectifier bridge circuit, and a differential amplifier AD620. The high-frequency oscillator CD4046 is connected to the drain of the MOSFET IRF640, the transmitting coil is connected to the gate of the MOSFET IRF640, the source of the MOSFET IRF640 is grounded, the output of the receiving coil is connected to the differential amplifier AD620 via the full-wave rectifier bridge, and the differential amplifier AD620 outputs a width voltage signal.

[0018] Preferably, the signal synthesis module includes an analog multiplier AD633 and a square root circuit AD827. The first input terminal of the analog multiplier AD633 is connected to the output terminal of the width detection module, the second input terminal of the analog multiplier AD633 is connected to the output terminal of the thickness detection module, and the output terminal of the analog multiplier AD633 is connected to the input terminal of the power control module via the square root circuit AD827.

[0019] Preferably, the power control module includes an error amplifier OPA2188, a voltage-controlled oscillator CD4046, a PWM controller UC3845, and a driver chip IR2110. The positive input terminal of the error amplifier OPA2188 is connected to the output terminal of the signal synthesis module, and the negative input terminal of the error amplifier OPA2188 is connected to the output terminal of the main power channel through a current sampling circuit. The input terminal of the voltage-controlled oscillator CD4046 is connected to the output terminal of the error amplifier OPA2188, the input terminal of the PWM controller UC3845 is connected to the output terminal of the voltage-controlled oscillator CD4046, and the output terminal of the PWM controller UC3845 is connected to the input terminal of the driver chip IR2110. The output terminal of the driver chip IR2110 is connected to the gate of the full-bridge IGBT module FF450R12KE3.

[0020] This utility model has the following beneficial effects:

[0021] In use, the steel plate enters the housing via a transport mechanism and undergoes heat treatment by an induction heating coil. The coil control circuit detects the thickness and width of the steel plate: the width detection module outputs a voltage signal proportional to the width through magnetic field changes, while the thickness detection module converts the current phase difference into a voltage signal inversely proportional to the thickness. These signals are then combined to generate a comprehensive control voltage, which adjusts the amplitude of the induction coil current, forming a closed-loop control to prevent overheating of the steel plate. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of this utility model;

[0024] Figure 2 This is a structural block diagram of the coil control circuit in this utility model.

[0025] 1. Frame; 2. Housing; 3. Transport mechanism; 4. Power module; 5. Main power channel; 6. Thickness detection module; 7. Width detection module; 8. Signal synthesis module; 9. Power control module. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0028] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0029] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0030] Furthermore, the terms "first," "second," and "third" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0031] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0032] A heat treatment device for galvanized steel sheets, such as Figure 1 As shown, it includes a housing 2, a transport mechanism 3 disposed within the housing 2, and an induction heating coil located within the housing 2 and on the outer ring of the transport mechanism 3. The induction heating coil is coupled to a coil control circuit, which can collect the width and thickness of the steel plate on the transport mechanism 3 and control the current flowing through the induction heating coil.

[0033] like Figure 2 As shown, the coil control circuit includes a power supply module 4, a main power channel 5, a thickness detection module 6, a width detection module 7, a signal synthesis module 8, and a power control module 9. The output of the power supply module 4 is connected to the input of the main power channel 5, which is used to convert AC power into stable DC power. The output of the main power channel 5 is connected to the induction heating coil, and its resonant circuit is connected to the current sampling terminal of the thickness detection module 6. The outputs of the width detection module 7 and the thickness detection module 6 are coupled to the input of the signal synthesis module 8. The output of the signal synthesis module 8 is connected to the reference voltage input of the power control module 9. The feedback input of the power control module 9 is connected to the output of the main power channel 5 through the current sampling circuit. The drive output of the power control module 9 is connected to the power switching device control terminal of the main power channel 5.

[0034] The power module 4 includes a three-phase rectifier bridge GBPC3506W and a parallel electrolytic capacitor bank. The AC input terminal of the three-phase rectifier bridge GBPC3506W is connected to a three-phase AC power supply, the DC positive output terminal of the three-phase rectifier bridge GBPC3506W is connected to the positive bus of the electrolytic capacitor bank, and the DC negative output terminal of the three-phase rectifier bridge GBPC3506W is grounded.

[0035] The main power channel 5 includes a full-bridge IGBT module FF450R12KE3 and a resonant capacitor bank. The DC positive terminal of the full-bridge IGBT module FF450R12KE3 is connected to the positive terminal of the electrolytic capacitor bank, the DC negative terminal of the full-bridge IGBT module FF450R12KE3 is grounded, and the AC output terminal of the full-bridge IGBT module FF450R12KE3 is connected to both ends of the induction heating coil via the resonant capacitor bank.

[0036] The thickness detection module 6 includes a current transformer, a phase detector AD8302, a voltage sampling divider network, and an integrator circuit. The current transformer is coupled to the phase detector AD8302, the voltage sampling divider network is coupled to the phase detector AD8302, and the phase detector AD8302 is coupled to the integrator circuit and outputs a thickness voltage signal through the integrator circuit.

[0037] The width detection module 7 includes a transmitting coil, a receiving coil, a MOSFET IRF640, a high-frequency oscillator CD4046, a full-wave rectifier bridge circuit, and a differential amplifier AD620. The high-frequency oscillator CD4046 is connected to the drain of the MOSFET IRF640, the transmitting coil is connected to the gate of the MOSFET IRF640, the source of the MOSFET IRF640 is grounded, and the output of the receiving coil is connected to the differential amplifier AD620 via the full-wave rectifier bridge. The differential amplifier AD620 outputs a width voltage signal.

[0038] The signal synthesis module 8 includes an analog multiplier AD633 and a square root circuit AD827. The first input terminal of the analog multiplier AD633 is connected to the output terminal of the width detection module 7, the second input terminal of the analog multiplier AD633 is connected to the output terminal of the thickness detection module 6, and the output terminal of the analog multiplier AD633 is connected to the input terminal of the power control module 9 via the square root circuit AD827.

[0039] The power control module 9 includes an error amplifier OPA2188, a voltage-controlled oscillator CD4046, a PWM controller UC3845, and a driver chip IR2110. The positive input terminal of the error amplifier OPA2188 is connected to the output terminal of the signal synthesis module 8, and the negative input terminal of the error amplifier OPA2188 is connected to the output terminal of the main power channel 5 through a current sampling circuit. The input terminal of the voltage-controlled oscillator CD4046 is connected to the output terminal of the error amplifier OPA2188, the input terminal of the PWM controller UC3845 is connected to the output terminal of the voltage-controlled oscillator CD4046, the output terminal of the PWM controller UC3845 is connected to the input terminal of the driver chip IR2110, and the output terminal of the driver chip IR2110 is connected to the gate of the full-bridge IGBT module FF450R12KE3.

[0040] In actual use, the steel plate can be transferred through the transport mechanism 3. When the steel plate enters the housing 2, it can pass through the induction heating coil to heat treat the steel plate. However, when dealing with steel plates of different thicknesses and widths, the coil control circuit can detect the thickness and width of the steel plate.

[0041] A high-frequency alternating magnetic field is generated by the transmitting coil of the width detection module 7. The receiving coil experiences changes in magnetic flux due to variations in the steel plate coverage area. This flux is then rectified and differentially amplified to output a DC voltage signal proportional to the steel plate width. Simultaneously, in the resonant capacitor bank of the main power channel 5, variations in steel plate thickness significantly alter eddy current losses. The phase of the resonant current is monitored in real-time by a series current transformer. A phase detector compares the phase difference between the voltage and current, converting it into a voltage signal inversely proportional to the thickness via an integrator circuit. The signal synthesis module 8 performs an analog multiplication operation on the width and thickness signals, takes the square root, and generates a comprehensive control voltage. This voltage is input to the error amplifier of the power control module 9 and compared with the real-time power signal fed back from the current transformer. This comparison drives the voltage-controlled oscillator to adjust the duty cycle of the PWM waveform. Finally, the high-frequency current amplitude of the induction coil is dynamically adjusted via a full-bridge IGBT, forming a process of "parameter detection, signal fusion, and transmission from the transmitting coil of the width detection module 7..." The coil generates a high-frequency alternating magnetic field. The magnetic flux of the receiving coil changes due to the difference in the coverage area of ​​the steel plate. Through full-wave rectification and differential amplification, a DC voltage signal proportional to the width of the steel plate is output. At the same time, in the resonant capacitor bank of the main power channel 5, the change in the thickness of the steel plate will significantly change the eddy current loss. The phase of the resonant current is monitored in real time by a series current transformer. The phase difference between the voltage and the current is compared by a phase detector. The voltage is converted into a voltage signal inversely proportional to the thickness by an integrating circuit. The signal synthesis module 8 performs an analog multiplication operation on the width and thickness signals and takes the square root to generate a comprehensive control voltage. This voltage is input to the error amplifier of the power control module 9 and compared with the real-time power signal fed back by the current transformer. This drives the voltage-controlled oscillator to adjust the duty cycle of the PWM waveform. Finally, the high-frequency current amplitude of the induction coil is dynamically adjusted by the full-bridge IGBT, forming a closed-loop control chain of "parameter detection, signal fusion, and power matching".

[0042] This allows the current flowing through the induction heating coil to be adjusted according to the thickness and width of the steel plate, preventing overheating of the steel plate.

[0043] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A galvanized steel sheet heat treatment apparatus characterized by comprising: It includes a housing (2), a transport mechanism (3) disposed within the housing (2), and an induction heating coil located within the housing (2) and on the outer ring of the transport mechanism (3). The induction heating coil is coupled to a coil control circuit, which can collect the width and thickness of the steel plate on the transport mechanism (3) and control the current flow of the induction heating coil.

2. The galvanized steel sheet heat treatment apparatus according to claim 1, characterized by, The coil control circuit includes a power supply module (4), a main power channel (5), a thickness detection module (6), a width detection module (7), a signal synthesis module (8), and a power control module (9); The output terminal of the power module (4) is connected to the input terminal of the main power channel (5), which is used to convert AC power into stable DC power; The output end of the main power channel (5) is connected to the induction heating coil, and its resonant circuit is connected to the current sampling end of the thickness detection module (6); The output terminals of the width detection module (7) and the thickness detection module (6) are coupled to the input terminal of the signal synthesis module (8); The output terminal of the signal synthesis module (8) is connected to the reference voltage input terminal of the power control module (9); The feedback input terminal of the power control module (9) is connected to the output terminal of the main power channel (5) through a current sampling circuit, and the drive output terminal of the power control module (9) is connected to the power switching device control terminal of the main power channel (5).

3. A galvanized steel sheet heat treatment apparatus according to claim 2, characterized by The power module (4) includes a three-phase rectifier bridge GBPC3506W and a parallel electrolytic capacitor bank. The AC input terminal of the three-phase rectifier bridge GBPC3506W is connected to a three-phase AC power supply. The DC positive output terminal of the three-phase rectifier bridge GBPC3506W is connected to the positive bus of the electrolytic capacitor bank. The DC negative output terminal of the three-phase rectifier bridge GBPC3506W is grounded.

4. The galvanized steel sheet heat treatment apparatus according to claim 2, characterized by The main power channel (5) includes a full-bridge IGBT module FF450R12KE3 and a resonant capacitor bank. The DC positive terminal of the full-bridge IGBT module FF450R12KE3 is connected to the positive terminal of the electrolytic capacitor bank. The DC negative terminal of the full-bridge IGBT module FF450R12KE3 is grounded. The AC output terminal of the full-bridge IGBT module FF450R12KE3 is connected to both ends of the induction heating coil via the resonant capacitor bank.

5. The galvanized steel sheet heat treatment apparatus according to claim 2, characterized by The thickness detection module (6) includes a current transformer, a phase detector AD8302, a voltage sampling divider network, and an integrator circuit. The current transformer is coupled to the phase detector AD8302, the voltage sampling divider network is coupled to the phase detector AD8302, and the phase detector AD8302 is coupled to the integrator circuit and outputs a thickness voltage signal through the integrator circuit.

6. The heat treatment equipment for galvanized steel sheets according to claim 2, characterized in that, The width detection module (7) includes a transmitting coil, a receiving coil, a MOS transistor IRF640, a high-frequency oscillator CD4046, a full-wave rectifier bridge circuit, and a differential amplifier AD620. The high-frequency oscillator CD4046 is connected to the drain of the MOS transistor IRF640. The transmitting coil is connected to the gate of the MOS transistor IRF640. The source of the MOS transistor IRF640 is grounded. The output of the receiving coil is connected to the differential amplifier AD620 via the full-wave rectifier bridge. The differential amplifier AD620 outputs a width voltage signal.

7. The heat treatment equipment for galvanized steel sheets according to claim 2, characterized in that, The signal synthesis module (8) includes an analog multiplier AD633 and a square root circuit AD827. The first input terminal of the analog multiplier AD633 is connected to the output terminal of the width detection module (7), the second input terminal of the analog multiplier AD633 is connected to the output terminal of the thickness detection module (6), and the output terminal of the analog multiplier AD633 is connected to the input terminal of the power control module (9) via the square root circuit AD827.

8. The heat treatment equipment for galvanized steel sheets according to claim 2, characterized in that, The power control module (9) includes an error amplifier OPA2188, a voltage-controlled oscillator CD4046, a PWM controller UC3845, and a driver chip IR2110. The positive input terminal of the error amplifier OPA2188 is connected to the output terminal of the signal synthesis module (8). The negative input terminal of the error amplifier OPA2188 is connected to the output terminal of the main power channel (5) through a current sampling circuit. The input terminal of the voltage-controlled oscillator CD4046 is connected to the output terminal of the error amplifier OPA2188. The input terminal of the PWM controller UC3845 is connected to the output terminal of the voltage-controlled oscillator CD4046. The output terminal of the PWM controller UC3845 is connected to the input terminal of the driver chip IR2110. The output terminal of the driver chip IR2110 is connected to the gate of the full-bridge IGBT module FF450R12KE3.

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