Intelligent ladle roasting device

Abstract

The present application relates to the technical field of ladle baking device, and proposes an intelligent ladle baking device, which comprises a main control unit and a heating and baking circuit, the heating and baking circuit is connected with the main control unit, and the heating and baking circuit comprises an operational amplifier U2, a resistor R7, a switch tube Q3, a heating device P1, a resistor R10, an operational amplifier U4 and a resistor R11, the noninverting input end of the operational amplifier U2 is connected with the first output end of the main control unit, the output end of the operational amplifier U2 is connected with the control end of the switch tube Q3, the first end of the switch tube Q3 is connected with a 380V power supply through the heating device P1, the second end of the switch tube Q3 is grounded through the resistor R10, the second end of the switch tube Q3 is connected with the noninverting input end of the operational amplifier U4, the inverting input end of the operational amplifier U4 is grounded, the output end of the operational amplifier U4 is connected with the inverting input end of the operational amplifier U4 through the resistor R11, and the output end of the operational amplifier U4 is connected with the inverting input end of the operational amplifier U2. Through the technical scheme, the problem of inaccurate baking temperature control of the electric heating ladle baking device in the prior art is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ladle baking device, in particular to an intelligent ladle baking device. BACKGROUND

[0002] The ladle baking device (ladle baking device) refers to the device for baking the ladle after being newly built and before being filled with molten steel. The traditional ladle baking device uses gas as fuel, and the combustion process is that the gas and air are mixed and combusted in the ladle through the burner installed on the ladle cover, and then the flame or high-temperature gas is sprayed into the ladle for baking and drying. Since a large amount of flame or high-temperature gas is continuously sprayed into the ladle, the ladle cover and the ladle opening cannot be closed, resulting in a large amount of heat loss. In addition, the heating process temperature is not easy to control, the tail gas of combustion is directly discharged, and the environment is seriously polluted.

[0003] With the development of industrial technology, the new energy-saving and environment-friendly electric heating ladle baking device solves the above technical problems, but the heating process of the existing electric heating ladle baking device is not easy to control, resulting in inaccurate baking temperature control. SUMMARY

[0004] The present application proposes an intelligent ladle baking device, which solves the problem of inaccurate baking temperature control of the electric heating ladle baking device in the prior art.

[0005] The technical scheme of the present application is as follows:

[0006] The intelligent ladle baking device comprises a main control unit and a heating and baking circuit, the heating and baking circuit is connected to the main control unit, and the heating and baking circuit comprises a resistor R5, an operational amplifier U2, a resistor R7, a switch tube Q3, a heating device P1, a relay K1, a resistor R10, a resistor R13, an operational amplifier U4, a resistor R11, a resistor R12 and a resistor R14,

[0007] The first end of the resistor R5 is connected to the first output end of the main control unit, the second end of the resistor R5 is connected to the non-inverting input end of the operational amplifier U2, the output end of the operational amplifier U2 is connected to the inverting input end of the operational amplifier U2 through the resistor R7, the output end of the operational amplifier U2 is connected to the control end of the switch tube Q3, the first end of the switch tube Q3 is connected to the first end of the heating device P1, the second end of the heating device P1 is connected to the common end of the relay K1 contact, and the normally open end of the relay K1 contact is connected to a 380V power supply,

[0008] The second end of the switch tube Q3 is grounded through the resistance R10, the second end of the switch tube Q3 is connected to the non-inverting input terminal of the operational amplifier U4 through the resistance R13, the inverting input terminal of the operational amplifier U4 is grounded through the resistance R12, the output terminal of the operational amplifier U4 is connected to the inverting input terminal of the operational amplifier U4 through the resistance R11, and the output terminal of the operational amplifier U4 is connected to the inverting input terminal of the operational amplifier U2 through the resistance R14.

[0009] Further, the heating roasting circuit in the application further comprises a NOT gate U3, a resistance R8 and a capacitor C3, the input terminal of the NOT gate U3 is connected to the output terminal of the operational amplifier U2, the output terminal of the NOT gate U3 is connected to the first terminal of the resistance R8, the second terminal of the resistance R8 is connected to the control terminal of the switch tube Q3, and the capacitor C3 is connected in parallel across the resistance R8.

[0010] Further, the application further comprises a driving circuit, the driving circuit comprises an optical coupler U1, a resistance R2, a transistor Q1 and a transistor Q2, the first input terminal of the optical coupler U1 is connected to the first output terminal of the main control unit, the second input terminal of the optical coupler U1 is grounded, the first output terminal of the optical coupler U1 is connected to a 12V power supply, the second output terminal of the optical coupler U1 is connected to the base of the transistor Q1 through the resistance R2, the base of the transistor Q1 is connected to the base of the transistor Q2, the collector of the transistor Q1 is connected to the 12V power supply, the emitter of the transistor Q1 is connected to the emitter of the transistor Q2, the emitter of the transistor Q2 is connected to the first terminal of the resistance R5, and the collector of the transistor Q2 is grounded.

[0011] Further, the application further comprises a heating control circuit, the heating control circuit comprises a resistance R15, a switch tube Q4, a resistance R16, a resistance R17 and a switch tube Q5, the control terminal of the switch tube Q4 is connected to the second output terminal of the main control unit through the resistance R15, the first terminal of the switch tube Q4 is connected to a 12V power supply, the second terminal of the switch tube Q4 is grounded through the resistance R16, the second terminal of the switch tube Q4 is connected to the control terminal of the switch tube Q5 through the resistance R17, the first terminal of the switch tube Q5 is connected to the first input terminal of the relay K1, the second input terminal of the relay K1 is connected to a 12V power supply, and the second terminal of the switch tube Q5 is grounded.

[0012] Further, the application further comprises a current detection circuit, the current detection circuit comprises a resistor R24, an operational amplifier U7, a resistor R28 and a resistor R26, a first end of the resistor R24 is connected to a second end of the switch tube Q3, a second end of the resistor R24 is connected to a non-inverting input terminal of the operational amplifier U7, an inverting input terminal of the operational amplifier U7 is grounded through the resistor R26, an output terminal of the operational amplifier U7 is connected to the inverting input terminal of the operational amplifier U7 through the resistor R28, and the output terminal of the operational amplifier U7 is connected to a first input terminal of the main control unit.

[0013] Further, the application further comprises a temperature detection circuit, the temperature detection circuit comprises a temperature sensor P2, a resistor R21, an operational amplifier U5, a resistor R20 and an operational amplifier U6, a first end of the temperature sensor P2 is connected to a 5V power supply, a second end of the temperature sensor P2 is grounded, a non-inverting input terminal of the operational amplifier U5 is connected to the first end of the temperature sensor P2, an inverting input terminal of the operational amplifier U5 is grounded through the resistor R21, an output terminal of the operational amplifier U5 is connected to the inverting input terminal of the operational amplifier U5 through the resistor R20, the output terminal of the operational amplifier U5 is connected to a non-inverting input terminal of the operational amplifier U6, an output terminal of the operational amplifier U6 is connected to an inverting input terminal of the operational amplifier U6, and the output terminal of the operational amplifier U6 is connected to a second input terminal of the main control unit.

[0014] Further, the temperature detection circuit further comprises a resistor R22, a capacitor C8, a capacitor C9 and a resistor R23, a first end of the resistor R22 is connected to the output terminal of the operational amplifier U6, a second end of the resistor R22 is grounded through the capacitor C8, the second end of the resistor R22 is connected to a first end of the capacitor C9, a second end of the capacitor C9 is grounded through the resistor R23, and the second end of the capacitor C9 is connected to the second input terminal of the main control unit.

[0015] The working principle and beneficial effects of the application are as follows:

[0016] In the application, the heating device P1 generates high temperature under the control of the heating roasting circuit, when the ladle roasting device works, first, the normally open end of the relay K1 contact is closed, so that the heating device P1 is connected with the 380V power supply, then the main control unit outputs the PWM control signal through the resistor R5 and adds it to the non-inverting input terminal of the operational amplifier U2, after being amplified by the operational amplifier U2, the signal is sent to the control end of the switch tube Q3, when the PWM control signal is at low level, the switch tube Q3 is cut off, and the heating device P1 does not work, when the PWM control signal is at high level, the operational amplifier U2 outputs high level, the switch tube Q3 is turned on, and the heating device P1 is powered to generate high temperature, when the PWM control signal becomes low level again, the heating device P1 stops working, and the cycle is formed.

[0017] The heating temperature of the heating device P1 can be adjusted by changing the duty ratio of the PWM control signal output by the master control unit, and when the temperature generated by the heating device P1 is unstable, the steelmaking operation is affected, therefore, the feedback circuit is added, when the heating device P1 works at a certain fixed temperature, the voltage is generated on the resistor R10, the resistor R10 is used as a sampling resistor, the voltage on the resistor R10 is added to the non-inverting input terminal of the operational amplifier U4 through the resistor R13, and after being amplified by the operational amplifier U4, the voltage is sent to the inverting input terminal of the operational amplifier U2, the operational amplifier U2 constitutes a subtraction circuit, if the temperature generated by the heating device P1 is lowered, the current flowing through the switch tube Q3 is reduced, therefore, the voltage on the resistor R10 is reduced, the voltage output by the operational amplifier U4 is reduced, the voltage at the control end of the switch tube Q3 is increased, the current at the first end of the switch tube Q3 is increased, so that the temperature generated by the heating device P1 is increased; on the contrary, the temperature generated by the heating device P1 is reduced.

[0018] In the present application, the temperature value generated by the heating device P1 can be adjusted by changing the duty ratio of the PWM control signal, and when the heating device P1 works at a certain fixed temperature, the feedback circuit can be used to ensure that the temperature generated by the heating device P1 remains stable and unchanged, thereby solving the problem of inaccurate baking temperature control of the electric heating ladle baking device in the prior art.

[0019] The present application will be further described in detail below in combination with the drawings and specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is the circuit diagram of the heating baking circuit in the present application;

[0021] Figure 2 It is the circuit diagram of the driving circuit in the present application;

[0022] Figure 3 It is the circuit diagram of the heating control circuit in the present application;

[0023] Figure 4 It is the circuit diagram of the current detection circuit in the present application;

[0024] Figure 5 It is the circuit diagram of the temperature detection circuit in the present application. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the embodiments of the present application, obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are involved in the scope of protection of the present application.

[0026] Embodiment 1

[0027] As Figure 1 shown, the embodiment proposes an intelligent ladle roasting device, which comprises a main control unit and a heating roasting circuit. The heating roasting circuit is connected to the main control unit. The heating roasting circuit comprises a resistor R5, an operational amplifier U2, a resistor R7, a switch tube Q3, a heating device P1, a relay K1, a resistor R10, a resistor R13, an operational amplifier U4, a resistor R11, a resistor R12, and a resistor R14. The first end of the resistor R5 is connected to the first output end of the main control unit. The second end of the resistor R5 is connected to the non-inverting input end of the operational amplifier U2. The output end of the operational amplifier U2 is connected to the inverting input end of the operational amplifier U2 through the resistor R7. The output end of the operational amplifier U2 is connected to the control end of the switch tube Q3. The first end of the switch tube Q3 is connected to the first end of the heating device P1. The second end of the heating device P1 is connected to the common end of the relay K1 contact. The normally open end of the relay K1 contact is connected to a 380V power supply. The second end of the switch tube Q3 is connected to the ground through the resistor R10. The second end of the switch tube Q3 is connected to the non-inverting input end of the operational amplifier U4 through the resistor R13. The inverting input end of the operational amplifier U4 is connected to the ground through the resistor R12. The output end of the operational amplifier U4 is connected to the inverting input end of the operational amplifier U4 through the resistor R11. The output end of the operational amplifier U4 is connected to the inverting input end of the operational amplifier U2 through the resistor R14.

[0028] The heating roasting circuit is used to control the heating device P1. When the ladle roasting device works, the normally open end of the relay K1 contact is first controlled to be closed, so that the heating device P1 is connected to the 380V power supply. Then, the main control unit outputs a PWM control signal through the resistor R5 and adds it to the non-inverting input end of the operational amplifier U2. After being amplified by the operational amplifier U2, the PWM control signal is sent to the control end of the switch tube Q3. When the PWM control signal is at a low level, the operational amplifier U2 outputs a low level, and the switch tube Q3 is cut off, so that the heating device P1 does not work. When the PWM control signal is at a high level, the operational amplifier U2 outputs a high level, and the switch tube Q3 is turned on. The 380V power supply forms a loop through the heating device P1, the switch tube Q3, and the resistor R10 in sequence and then reaches the ground. The heating device P1 is powered to generate high temperature. When the PWM control signal becomes low again, the heating device P1 stops working. In this way, a cycle is formed.

[0029] When it is necessary to adjust the heating temperature of the heating device P1, the current flowing through the first end of the switch tube Q3 can be changed. The greater the current flowing through the first end of the switch tube Q3, the greater the power output by the heating device P1, and thus the higher the temperature generated by the heating device P1. The current flowing through the first end of the switch tube Q3 can be changed by changing the duty ratio of the PWM control signal output by the main control unit. The greater the duty ratio of the PWM control signal, the longer the on time of the switch tube Q3, and the higher the average current flowing through the first end of the switch tube Q3, thereby increasing the heating temperature of the heating device P1. When the heating temperature of the heating device P1 needs to be reduced, the duty ratio of the PWM control signal can be reduced to achieve this.

[0030] The ladle roasting is one of the main links in the steelmaking production process, and the ladle roasting temperature has an important role in coordinating the whole production, and is more important for continuous casting production. The steelmaking production environment is complex, and in the working process of the electric heating ladle roasting device, the temperature generated by the heating device P1 may be high or low due to some uncontrollable factors, which makes the ladle roasting temperature unstable, thereby affecting the steelmaking operation. Therefore, the feedback circuit is added in the embodiment, and the feedback circuit is composed of an operational amplifier U4. When the heating device P1 needs to work at a certain fixed temperature, a voltage is generated on the resistor R10, and the resistor R10 acts as a sampling resistor. The voltage on the resistor R10 is added to the non-inverting input terminal of the operational amplifier U4 through the resistor R13, and after being amplified by the operational amplifier U4, it is sent to the inverting input terminal of the operational amplifier U2. The operational amplifier U2 constitutes a subtraction circuit. If the temperature generated by the heating device P1 is low, the current flowing through the switch tube Q3 decreases, so the voltage on the resistor R10 decreases, the output voltage of the operational amplifier U4 decreases, and the voltage at the inverting input terminal of the operational amplifier U2 decreases, so the output voltage of the operational amplifier U2 increases, the voltage at the control end of the switch tube Q3 increases, and the current at the first end of the switch tube Q3 increases, thereby increasing the temperature generated by the heating device P1. Similarly, when the temperature generated by the heating device P1 increases, the voltage at the control end of the switch tube Q3 decreases, thereby reducing the current at the first end of the switch tube Q3, and reducing the temperature generated by the heating device P1. When stopping working, the normally open end of the control relay K1 contact is disconnected.

[0031] In the embodiment, the N-channel enhancement mode field effect tube is used as the switch tube Q3, the control end of the switch tube Q3 is the gate of the N-channel enhancement mode field effect tube, the first end of the switch tube Q3 is the drain of the N-channel enhancement mode field effect tube, and the second end of the switch tube Q3 is the source of the N-channel enhancement mode field effect tube.

[0032] Therefore, in the embodiment, the duty cycle of the PWM control signal can be changed to adjust the temperature value generated by the heating device P1, and when the heating device P1 works at a certain fixed temperature, the feedback circuit can be used to ensure that the temperature generated by the heating device P1 remains stable and unchanged.

[0033] As shown in Figure 1 In the embodiment, the heating roasting circuit further includes a NOT gate U3, a resistor R8 and a capacitor C3. The input end of the NOT gate U3 is connected to the output end of the operational amplifier U2, the output end of the NOT gate U3 is connected to the first end of the resistor R8, the second end of the resistor R8 is connected to the control end of the switch tube Q3, and the capacitor C3 is connected in parallel across the resistor R8.

[0034] In this embodiment, the PWM control signal output by the operational amplifier U2 can be unstable, which can easily cause the temperature generated by the heating device P1 to change. Therefore, a NOT gate U3 is added between the operational amplifier U3 and the switching tube Q3. The NOT gate U3 is used to perform shaping processing on the PWM control signal. The phase of the PWM control signal output by the NOT gate U3 is opposite to that of the PWM control signal output by the main control unit. The resistor R8 functions as a current limiter to protect the control end of the switching tube Q3. The capacitor C3 is a high-speed capacitor, which improves the switching speed of the switching tube Q3.

[0035] As shown in Figure 2 The driving circuit in this embodiment includes the optocoupler U1, the resistor R2, the transistor Q1, and the transistor Q2. The first input end of the optocoupler U1 is connected to the first output end of the main control unit. The second input end of the optocoupler U1 is grounded. The first output end of the optocoupler U1 is connected to the 12V power supply. The second output end of the optocoupler U1 is connected to the base of the transistor Q1 through the resistor R2. The base of the transistor Q1 is connected to the base of the transistor Q2. The collector of the transistor Q1 is connected to the 12V power supply. The emitter of the transistor Q1 is connected to the emitter of the transistor Q2. The emitter of the transistor Q2 is connected to the first end of the resistor R5. The collector of the transistor Q2 is grounded.

[0036] In this embodiment, the driving capability of the PWM control signal output by the main control unit is weak. If the PWM control signal is directly added to the input end of the operational amplifier U2, the amplification factor of the operational amplifier U2 will be very high, which can introduce a large amount of error signals and affect the normal operation of the circuit. Therefore, the driving circuit is added between the main control unit and the input end of the operational amplifier U2 to improve the driving capability of the PWM control signal.

[0037] The PWM control signal output by the main control unit is added to the first input end of the optocoupler U1. When the PWM signal is at a high level, the optocoupler U1 is turned on, the bases of the transistors Q1 and Q2 are at a high level, the transistor Q1 is turned on, and the transistor Q2 is turned off. The emitter of the transistor Q2 outputs a high-level signal. When the PWM control signal is at a low level, the optocoupler U1 is turned off, the emitter output end of the transistor Q2 outputs a low-level signal, and the signal output by the emitter of the transistor Q2 is sent to the first end of the resistor R5.

[0038] The transistors Q1 and Q2 constitute a push-pull circuit, which is used to improve the driving capability of the PWM control signal. The optocoupler U1 constitutes an isolation circuit, which prevents the signals from interfering with each other.

[0039] As shown in Figure 3As shown, this embodiment also includes a heating control circuit, which includes a resistor R15, a switching transistor Q4, a resistor R16, a resistor R17, and a switching transistor Q5. The control terminal of the switching transistor Q4 is connected to the second output terminal of the main control unit through the resistor R15. The first terminal of the switching transistor Q4 is connected to a 12V power supply, and the second terminal of the switching transistor Q4 is grounded through the resistor R16. The second terminal of the switching transistor Q4 is connected to the control terminal of the switching transistor Q5 through the resistor R17. The first terminal of the switching transistor Q5 is connected to the first input terminal of the relay K1, and the second input terminal of the relay K1 is connected to a 12V power supply. The second terminal of the switching transistor Q5 is grounded.

[0040] In this embodiment, when the heating device P1 needs to work, the normally open contact of the relay K1 is closed first, and the heating device P1 is powered on. When baking is finished, the normally open contact of the relay K1 is opened to prevent the main control unit from malfunctioning when the heating device P1 stops working, which would cause the heating device P1 to generate high temperature. Therefore, the heating control circuit plays a certain protective role.

[0041] Specifically, the working principle of the heating control circuit is as follows: When the heating device P1 is not working, the main control unit outputs a high-level signal to the control terminal of the switching transistor Q4, the switching transistor Q4 is cut off, the second terminal of the switching transistor Q4 is at a low level, the switching transistor Q5 is cut off, and the relay K1 does not operate. When the heating device P1 is working, the main control unit outputs a low-level signal to the control terminal of the switching transistor Q4, the second terminal of the switching transistor Q4 is at a high level, the switching transistor Q5 is turned on, the coil of the relay K1 is energized, and the normally open contact of the relay K1 is closed.

[0042] like Figure 4 As shown, this embodiment also includes a current detection circuit, which includes a resistor R24, an operational amplifier U7, a resistor R28, and a resistor R26. The first end of the resistor R24 ​​is connected to the second end of the switching transistor Q3, and the second end of the resistor R24 ​​is connected to the non-inverting input of the operational amplifier U7. The inverting input of the operational amplifier U7 is grounded through the resistor R26, and the output of the operational amplifier U7 is connected to the inverting input of the operational amplifier U7 through the resistor R28. The output of the operational amplifier U7 is connected to the first input of the main control unit.

[0043] In the embodiment, the heating device P1 controls the temperature by controlling the average current flowing through the first end of the switch tube Q3 during the working process of the heating device P1, and the switch tube Q3 will be broken down when the current flowing through the first end of the switch tube Q3 is too high, thereby causing the heating and roasting circuit to be unable to work. Therefore, the current flowing through the first end of the switch tube Q3 needs to be detected. The current detection circuit also uses the resistance R10 as a sampling resistance, and the voltage across the resistance R10 can be used to determine the size of the current flowing through the first end of the switch tube Q3. The voltage across the resistance R10 is divided by the resistance R24 and the resistance R25, and then sent to the non-inverting input terminal of the operational amplifier U7. The operational amplifier U7 constitutes an amplification circuit, and the voltage signal amplified by the operational amplifier U7 is sent to the main control unit. The resistance R27 and the capacitor C10 constitute a low-pass filter circuit, which is used to filter out high-frequency noise signals in the output signal of the operational amplifier U7. The voltage stabilizing tube VD1 plays a protection role to prevent the voltage entering the main control unit from being too high.

[0044] When the voltage signal received by the main control unit exceeds the set value, the main control unit outputs a high-level signal to the control end of the switch tube Q4, so that the normally open contact of the relay K1 is powered off, thereby protecting the switch tube Q3.

[0045] As shown in Figure 5 In the embodiment, the temperature detection circuit also includes a temperature sensor P2, a resistance R21, an operational amplifier U5, a resistance R20, and an operational amplifier U6. The first end of the temperature sensor P2 is connected to a 5V power supply, and the second end of the temperature sensor P2 is grounded. The non-inverting input terminal of the operational amplifier U5 is connected to the first end of the temperature sensor P2, and the inverting input terminal of the operational amplifier U5 is grounded through the resistance R21. The output terminal of the operational amplifier U5 is connected to the inverting input terminal of the operational amplifier U5 through the resistance R20. The output terminal of the operational amplifier U5 is connected to the non-inverting input terminal of the operational amplifier U6, and the output terminal of the operational amplifier U6 is connected to the inverting input terminal of the operational amplifier U6. The output terminal of the operational amplifier U6 is connected to the second input terminal of the main control unit.

[0046] In the embodiment, the temperature detection circuit is also used to detect the roasting temperature of the heating device P1, and convert the detected temperature signal into an electrical signal and send it to the main control unit. Whether the roasting temperature of the heating device P1 reaches the set temperature value is determined, and if not, the PWM control signal is changed to make it reach the set temperature value.

[0047] Specifically, the working principle of the temperature detection circuit is as follows: the temperature sensor P2 is used to detect the roasting temperature of the heating device P1, and convert the temperature signal into an electrical signal and send it to the non-inverting input terminal of the operational amplifier U5. The operational amplifier U5 constitutes an amplification circuit, and the electrical signal output by the temperature sensor P2 needs to be amplified by the operational amplifier U5 because the electrical signal output by the temperature sensor P2 is relatively weak. The amplified signal is sent to the main control unit through the follower constituted by the operational amplifier U6, and the follower plays a role in signal isolation.

[0048] As Figure 5 shown, the temperature detection circuit in the embodiment further comprises a resistor R22, a capacitor C8, a capacitor C9 and a resistor R23, a first end of the resistor R22 is connected to an output end of the operational amplifier U6, a second end of the resistor R22 is connected to the ground through the capacitor C8, the second end of the resistor R22 is connected to a first end of the capacitor C9, a second end of the capacitor C9 is connected to the ground through the resistor R23, and the second end of the capacitor C9 is connected to a second input end of the main control unit.

[0049] During detection of the baking temperature of the heating device P1 by the temperature sensor P2, some interference signals are introduced, and if the interference signals are not filtered, the precision of the temperature detection will be seriously affected, therefore, in the embodiment, a filter circuit is added between the operational amplifier U6 and the main control unit, the resistor R22 and the capacitor C8 constitute a low-pass filter circuit for filtering high-frequency noise in the signal, and the capacitor C9 and the resistor R23 constitute a high-pass filter circuit for filtering noise signals in the signal, and finally the filtered electrical signal is sent to the main control unit.

[0050] The above is only a preferred embodiment of the present application, and is not used to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An intelligent ladle baking device, characterized in that, The system includes a main control unit and a heating and baking circuit. The heating and baking circuit is connected to the main control unit. The heating and baking circuit includes resistor R5, operational amplifier U2, resistor R7, switching transistor Q3, heating device P1, relay K1, resistor R10, resistor R13, operational amplifier U4, resistor R11, resistor R12, and resistor R14. The first end of resistor R5 is connected to the first output terminal of the main control unit, and the second end of resistor R5 is connected to the non-inverting input terminal of operational amplifier U2. The output terminal of operational amplifier U2 is connected to the inverting input terminal of operational amplifier U2 through resistor R7. The output terminal of operational amplifier U2 is connected to the control terminal of switching transistor Q3. The first end of switching transistor Q3 is connected to the first terminal of heating device P1. The second end of heating device P1 is connected to the common terminal of relay K1 contact, and the normally open terminal of relay K1 contact is connected to a 380V power supply. The second terminal of the switching transistor Q3 is grounded through the resistor R10. The second terminal of the switching transistor Q3 is connected to the non-inverting input terminal of the operational amplifier U4 through the resistor R13. The inverting input terminal of the operational amplifier U4 is grounded through the resistor R12. The output terminal of the operational amplifier U4 is connected to the inverting input terminal of the operational amplifier U4 through the resistor R11. The output terminal of the operational amplifier U4 is connected to the inverting input terminal of the operational amplifier U2 through the resistor R14. The heating and baking circuit also includes a NOT gate U3, a resistor R8, and a capacitor C3. The input terminal of the NOT gate U3 is connected to the output terminal of the operational amplifier U2, the output terminal of the NOT gate U3 is connected to the first terminal of the resistor R8, the second terminal of the resistor R8 is connected to the control terminal of the switching transistor Q3, and the capacitor C3 is connected in parallel across the resistor R8.

2. The intelligent ladle baking device according to claim 1, characterized in that, It also includes a driving circuit, which includes an optocoupler U1, a resistor R2, a transistor Q1, and a transistor Q2. The first input terminal of the optocoupler U1 is connected to the first output terminal of the main control unit, the second input terminal of the optocoupler U1 is grounded, the first output terminal of the optocoupler U1 is connected to a 12V power supply, the second output terminal of the optocoupler U1 is connected to the base of the transistor Q1 through the resistor R2, the base of the transistor Q1 is connected to the base of the transistor Q2, the collector of the transistor Q1 is connected to the 12V power supply, the emitter of the transistor Q1 is connected to the emitter of the transistor Q2, the emitter of the transistor Q2 is connected to the first terminal of the resistor R5, and the collector of the transistor Q2 is grounded.

3. The intelligent ladle baking device according to claim 1, characterized in that, It also includes a heating control circuit, which includes a resistor R15, a switching transistor Q4, a resistor R16, a resistor R17, and a switching transistor Q5. The control terminal of the switching transistor Q4 is connected to the second output terminal of the main control unit through the resistor R15. The first terminal of the switching transistor Q4 is connected to a 12V power supply. The second terminal of the switching transistor Q4 is grounded through the resistor R16. The second terminal of the switching transistor Q4 is connected to the control terminal of the switching transistor Q5 through the resistor R17. The first terminal of the switching transistor Q5 is connected to the first input terminal of the relay K1. The second input terminal of the relay K1 is connected to a 12V power supply. The second terminal of the switching transistor Q5 is grounded.

4. The intelligent ladle baking device according to claim 1, characterized in that, It also includes a current detection circuit, which includes a current sensor R24, an operational amplifier U7, a resistor R28, and a resistor R26. The first end of the resistor R24 ​​is connected to the second end of the switching transistor Q3, and the second end of the resistor R24 ​​is connected to the non-inverting input of the operational amplifier U7. The inverting input of the operational amplifier U7 is grounded through the resistor R26. The output of the operational amplifier U7 is connected to the inverting input of the operational amplifier U7 through the resistor R28. The output of the operational amplifier U7 is connected to the first input of the main control unit.

5. The intelligent ladle baking device according to claim 1, characterized in that, It also includes a temperature detection circuit, which comprises a temperature sensor P2, a resistor R21, an operational amplifier U5, a resistor R20, and an operational amplifier U6. The first terminal of the temperature sensor P2 is connected to a 5V power supply, and the second terminal of the temperature sensor P2 is grounded. The non-inverting input terminal of the operational amplifier U5 is connected to the first terminal of the temperature sensor P2, and the inverting input terminal of the operational amplifier U5 is grounded through the resistor R21. The output terminal of the operational amplifier U5 is connected to the inverting input terminal of the operational amplifier U5 through the resistor R20. The output terminal of the operational amplifier U5 is connected to the non-inverting input terminal of the operational amplifier U6, and the output terminal of the operational amplifier U6 is connected to the inverting input terminal of the operational amplifier U6. The output terminal of the operational amplifier U6 is connected to the second input terminal of the main control unit.

6. The intelligent ladle baking device according to claim 5, characterized in that, The temperature detection circuit also includes resistor R22, capacitor C8, capacitor C9 and resistor R23. The first end of resistor R22 is connected to the output terminal of operational amplifier U6. The second end of resistor R22 is grounded through capacitor C8. The second end of resistor R22 is connected to the first end of capacitor C9. The second end of capacitor C9 is grounded through resistor R23. The second end of capacitor C9 is connected to the second input terminal of the main control unit.

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