Zinc dross self-cleaning inductor operation control method and device based on circulating gully

Abstract

The invention provides a zinc dross self-cleaning inductor operation control method and device based on a circulating gully, and relates to the technical field of industrial smelting furnaces, the method comprises the following steps: step 1, monitoring the temperature of zinc liquid in a zinc pot in real time through a temperature sensor, and transmitting a temperature signal to a temperature control instrument; 2, the temperature control instrument processes the temperature signal according to a set threshold value and outputs a high-temperature signal or a low-temperature signal to the programmable logic controller; and step 3, the programmable logic controller controls the contactor group to switch the output voltage of the autotransformer based on the temperature signal, so that the inductor operates in a low-power, medium-power or high-power mode. Through real-time temperature control, automatic power regulation and circulating gully, the liquidity and heating efficiency of molten zinc are improved, zinc slag blockage and manual cleaning are reduced, the service life of the inductor is prolonged, and the product quality is stabilized.

Description

Technical Field

[0001] The present invention relates to the technical field of industrial furnaces, and particularly to a zinc slag self-cleaning inductor operation control method and device based on a circulating scouring channel. Background Art

[0002] There are certain defects in the practical application of continuous hot-dip galvanizing inductor heating technology. During continuous hot-dip galvanizing, the accumulation of zinc slag is likely to affect the galvanizing effect and product quality.

[0003] Specifically, the temperature of the zinc pot controls the high and low power heating of the inductor through a temperature control instrument, but the high-power operation time is often limited, making the fluidity of the zinc liquid in the scouring channel relatively fixed. After the zinc slag generated inside the zinc pot enters the scouring channel with the flow of the zinc liquid, due to certain limitations of the inductor in discharging slag, the slag may gradually deposit and cause the scouring channel to be blocked, which may further cause the inductor current to decrease, the service life to be shortened, and the flow rate of the zinc liquid may also slow down accordingly, ultimately having an adverse impact on the heating efficiency and production efficiency of the zinc pot.

[0004] In addition, the zinc slag adheres tightly and has a high hardness in the scouring channel. When using conventional physical cleaning methods, problems such as low cleaning efficiency may be faced, and it may also cause damage to the inductor or cleaning tools, increasing the maintenance cost. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a zinc slag self-cleaning inductor operation control method and device based on a circulating scouring channel, which improves the fluidity of the zinc liquid in the inductor scouring channel and reduces zinc slag blockage.

[0006] To solve the above technical problem, the technical solution of the present invention is as follows: In a first aspect, a zinc slag self-cleaning inductor operation control method based on a circulating scouring channel, the method comprising: Step 1, continuously monitor the temperature of the zinc liquid in the zinc pot through a temperature sensor, and transmit the temperature signal to a temperature control instrument; Step 2, the temperature control instrument processes the temperature signal according to a set threshold and outputs a high-temperature or low-temperature signal to a programmable logic controller; Step 3, the programmable logic controller controls a contactor bank to switch the output voltage of an autotransformer based on the temperature signal, so that the inductor operates in a low-power, medium-power, or high-power mode; Step 4, send a scouring channel start instruction to the programmable logic controller through a touch screen, and immediately cut off the control logic of the temperature control mode; Step 5, the programmable logic controller sequentially triggers the high-power contactors of each inductor in a preset order in a cycle, each time making a single inductor operate at high power for a preset duration, and the remaining inductors are synchronously switched to a low-power operation state; Step 6: Utilize the strong electromagnetic force generated by the inductor during high-power operation to drive the zinc liquid to scour the inner wall of the melting channel at high speed, strip and discharge the deposited zinc slag. After completing the cyclic channel flushing operation for all the inductors, the programmable logic controller automatically switches back to the temperature control mode and re-enters the cycle of temperature monitoring and power regulation.

[0007] Furthermore, the temperature control instrument processes the temperature signal according to the set threshold and outputs a high-temperature or low-temperature signal to the programmable logic controller, including: The temperature control instrument receives the real-time zinc liquid temperature data from the temperature sensor; When the zinc liquid temperature is lower than the lower limit of the preset threshold, it outputs a low-temperature signal to the second intermediate relay, and sends a low-temperature instruction to the programmable logic controller through the normally open contact of the second intermediate relay; When the zinc liquid temperature is higher than the upper limit of the set threshold, it outputs a high-temperature signal to the first intermediate relay, and sends a high-temperature instruction to the programmable logic controller through the normally open contact of the first intermediate relay.

[0008] Furthermore, based on the temperature signal, the programmable logic controller controls the contactor group to switch the output voltage of the autotransformer, so that the inductor operates in low-power, medium-power or high-power mode, including: When receiving the low-temperature instruction, it triggers the sixth contactor coil, and the normally open point of the sixth contactor closes to trigger the third contactor coil. The main contact of the third contactor connects to the low-power gear of the autotransformer, so that the inductor operates at 20KW; When receiving the high-temperature instruction, it triggers the fourth contactor coil, and the normally open point of the fourth contactor closes to trigger the first contactor coil. The main contact of the first contactor connects to the high-power gear of the autotransformer, so that the inductor operates at 400KW; When there is no high or low temperature instruction, it triggers the fifth contactor coil, and the normally open point of the fifth contactor closes to trigger the second contactor coil. The main contact of the second contactor connects to the medium-power gear of the autotransformer, so that the inductor operates at 160KW; Among them, the first contactor, the second contactor, and the third contactor avoid simultaneous conduction through an interlock circuit.

[0009] Furthermore, the low-power gear is 120V, the high-power gear is 500V, and the medium-power gear is 200V.

[0010] Furthermore, send a channel flushing start instruction to the programmable logic controller through the touch screen, and immediately cut off the control logic of the temperature control mode, including: The touch screen generates a pulsed start signal and transmits it to the input port of the programmable logic controller. The programmable logic controller disconnects the coil control circuits of the fourth contactor, the fifth contactor, and the sixth contactor, and blocks the output signals from the temperature control instrument to the first intermediate relay and the second intermediate relay.

[0011] Further, the programmable logic controller cyclically triggers the high-power contactors of each inductor in a preset order, each time enabling a single inductor to operate at high power for a preset duration, and the remaining inductors synchronously switch to the low-power operating state, including: After receiving the gully start instruction, immediately disconnect the outputs of the fourth contactor, fifth contactor, and sixth contactor in the temperature control mode; Select the first inductor, trigger the fourth contactor coil corresponding to the first inductor, the normally open point of the fourth contactor closes to trigger the first contactor coil, enabling the first inductor to connect to the 500V high-power gear, and at the same time force the remaining inductors to trigger the sixth contactor coil, the normally open point of the sixth contactor closes to trigger the third contactor coil, enabling the remaining inductors to connect to the 120V low-power gear.

[0012] Further, utilize the strong electromagnetic force generated by the inductor during high-power operation to drive the zinc liquid to rapidly scour the inner wall of the melting groove, strip and discharge the deposited zinc slag. After completing the cyclic gully flushing operation of all inductors, the programmable logic controller automatically switches back to the temperature control mode and re-enters the cycle of temperature monitoring and power adjustment, including: During high-power operation, the inductor forms a strong alternating electromagnetic field in the melting groove, which acts on the zinc liquid to generate a directional Lorentz force, driving the zinc liquid to rapidly scour the inner wall of the melting groove and mechanically strip the attached zinc slag; the stripped zinc slag flows out with the zinc liquid and is discharged to the deposition area of the zinc pot main body; After the cyclic gully flushing of all inductors is completed, the programmable logic controller disconnects the outputs of all fourth contactors; restores the temperature control logic control authority of the fourth contactor, fifth contactor, and sixth contactor; and reactivates the closed-loop temperature adjustment link of the temperature sensor, temperature control instrument, and programmable logic controller.

[0013] In the second aspect, a zinc slag self-cleaning inductor operation control device based on cyclic gully flushing includes: The main circuit module is used to construct a three-phase three-wire system circuit, including a molded case circuit breaker connected to the three-phase power input terminal, an autotransformer connected to the molded case circuit breaker through the input terminal and providing three adjustable voltage levels at the output terminal, and at least two inductors connected in parallel to the output terminal of the autotransformer, and the melting groove of each inductor is connected to the zinc pot main body; The signal acquisition module is used to monitor and transmit temperature signals in real time, including a temperature sensor immersed in the zinc pot main body to monitor the zinc liquid temperature, and a temperature control instrument receiving the temperature sensor signal and outputting a high-temperature or low-temperature signal; The logic control module is used to process control signals and perform logical operations, including a programmable logic controller receiving high-temperature or low-temperature instructions from the temperature control instrument; responding to the pulse start signal of the touch screen; the first intermediate relay and the second intermediate relay respectively transmitting the high-temperature and low-temperature instructions of the temperature control instrument to the programmable logic controller; A power switching module for realizing the power regulation of the inductor, which includes a programmable logic controller that controls a contactor group to switch the output voltage of an autotransformer based on a temperature command, so that the inductor operates in a low-power, medium-power, or high-power mode; An interlock protection module for mutually exclusive conduction of the coil power supply circuits of the first contactor, the second contactor, and the third contactor; A human-machine interaction module for realizing human-machine signal interaction, which includes a touch screen that is communicatively connected to the programmable logic controller and generates a pulse start signal to activate the flushing groove module.

[0014] In a third aspect, a computing device includes: One or more processors; A storage device for storing one or more programs, which when executed by the one or more processors cause the one or more processors to implement the method described above.

[0015] In a fourth aspect, a computer-readable storage medium stores a program that implements the method when executed by a processor.

[0016] The above solution of the present invention has at least the following beneficial effects: Through real-time temperature monitoring and threshold analysis, combined with a multi-level power automatic regulation mechanism, the temperature balance of the zinc liquid is accurately maintained, effectively ensuring the stable and reliable quality of the galvanized layer. Based on the high-power directional flushing technology, a strong electromagnetic field drives the zinc liquid to form a high-speed flow, completely stripping and removing the deposited impurities on the inner wall of the melting groove, improving the fluidity of the zinc liquid, and avoiding the risk of blockage from the source. The substantial reduction in the zinc slag deposition amount significantly reduces the inductor loss, and at the same time avoids the damage to the equipment caused by traditional physical cleaning, achieving a leapfrog improvement in the service life of the core components. The periodic automatic cleaning mechanism compresses the manual maintenance operation time, simultaneously reduces the maintenance frequency, and promotes the structural optimization of the operation and maintenance cost. The multi-inductor cooperative temperature control technology during the flushing groove process ensures the continuous stability of the zinc pot temperature, avoids production interruption, and achieves a qualitative breakthrough in the overall operation efficiency.

[0017] The dynamic cooperation strategy of single-point high power and global low power reconstructs the energy consumption distribution structure and realizes the essential optimization of the electric energy utilization efficiency. The central control system automatically completes the mode switching and operation sequence, maximizing the elimination of human intervention errors and improving the system reliability and process consistency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic flowchart of a method for controlling the operation of a zinc slag self-cleaning inductor based on cyclic flushing provided by an embodiment of the present invention.

[0019] Figure 2It is the main circuit topology and power control structure diagram of a zinc slag self-cleaning inductor operation control device based on a circulating gully provided by an embodiment of the present invention.

[0020] Figure 3 It is the temperature control mode signal transmission and logic control diagram of a zinc slag self-cleaning inductor operation control device based on a circulating gully provided by an embodiment of the present invention.

[0021] Figure 4 It is the gully mode programmable logic controller control and interlock protection diagram of a zinc slag self-cleaning inductor operation control device based on a circulating gully provided by an embodiment of the present invention.

[0022] Explanation of reference numerals: 1. Temperature sensor; 2. Temperature control instrument; 3. Programmable logic controller; 4. Auto-transformer; 5. First intermediate relay; 6. Second intermediate relay; 7. Sixth contactor; 8. Third contactor; 9. Fourth contactor; 10. First contactor; 11. Fifth contactor; 12. Second contactor; 13. Molded case circuit breaker. Detailed implementation manners

[0023] Hereinafter, exemplary embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be fully conveyed to those skilled in the art.

[0024] As Figure 1 shown, an embodiment of the present invention proposes a zinc slag self-cleaning inductor operation control method based on a circulating gully, and the method includes the following steps: Step 1, the temperature of the zinc liquid in the zinc pot is monitored in real time by the temperature sensor 1, and the temperature signal is transmitted to the temperature control instrument 2; Step 2, the temperature control instrument 2 processes the temperature signal according to the set threshold and outputs a high temperature or low temperature signal to the programmable logic controller 3; Step 3, based on the temperature signal, the programmable logic controller 3 controls the contactor group to switch the output voltage of the auto-transformer 4 so that the inductor operates in a low power, medium power or high power mode; Step 4, a gully start instruction is sent to the programmable logic controller 3 through the touch screen, and the control logic of the temperature control mode is immediately cut off; Step 5, the programmable logic controller 3 sequentially triggers the high-power contactors of each inductor in a preset order, each time making a single inductor operate at high power for a preset duration, and the remaining inductors are synchronously switched to the low-power operation state; Step 6: Utilize the strong electromagnetic force generated by the inductor during high-power operation to drive the zinc liquid to scour the inner wall of the melting groove at high speed, strip and discharge the deposited zinc slag. After completing the cyclic flushing of all inductors, the programmable logic controller 3 automatically switches back to the temperature control mode and re-enters the cycle of temperature monitoring and power regulation.

[0025] In the embodiment of the present invention, the strong electromagnetic force during high-power operation is used to drive the zinc liquid to scour the melting groove at high speed, effectively stripping and discharging the deposited zinc slag, reducing the blockage of the melting groove, and enhancing the fluidity of the zinc liquid. The temperature sensor monitors in real time, combined with the power regulation of the temperature control instrument and the programmable logic controller PLC, enabling the inductor to operate dynamically in the low / medium / high power mode, maintaining the stability of the zinc liquid temperature, and improving the heating uniformity and efficiency. The cyclic flushing mode reduces the loss of the inductor caused by the accumulation of zinc slag, avoids tool damage caused by conventional physical cleaning, prolongs the service life of the inductor, and reduces the manual cleaning time and cost. After the touch screen triggers the flushing mode, the PLC automatically cuts off the temperature control and cyclically triggers the high-power operation of a single inductor, while the other inductors maintain heating at low power. After completion, the temperature control is automatically restored to ensure uninterrupted production.

[0026] In a preferred embodiment of the present invention, in the above step 1, the temperature of the zinc liquid in the zinc pot is monitored in real time by the temperature sensor 1, and the temperature signal is transmitted to the temperature control instrument 2; in the above step 2, the temperature control instrument 2 processes the temperature signal according to the set threshold and outputs a high-temperature or low-temperature signal to the programmable logic controller 3, which may include: Step 200: The temperature control instrument 2 receives the real-time zinc liquid temperature data of the temperature sensor 1. Step 201: When the zinc liquid temperature is lower than the lower limit of the preset threshold, a low-temperature signal is output to the second intermediate relay 6, and a low-temperature instruction is sent to the programmable logic controller 3 through the normally open contact of the second intermediate relay 6. Step 202: When the zinc liquid temperature is higher than the upper limit of the set threshold, a high-temperature signal is output to the first intermediate relay 5, and a high-temperature instruction is sent to the programmable logic controller 3 through the normally open contact of the first intermediate relay 5.

[0027] In the embodiment of the present invention, the temperature sensor (RT) adopts a high-temperature-resistant metal probe structure and is vertically immersed in the zinc liquid inside the main body of the zinc pot. Its installation position needs to ensure that the tip of the probe is located in the main flow area of the zinc liquid to accurately reflect the overall temperature. The sensor is connected to the signal input end of the temperature control instrument (XM) through a shielded cable, and the transmission protocol uses the industrial standard 4-20mA current signal to ensure anti-interference ability. The monitoring frequency is set to 1 time per second, and the zinc liquid temperature data is collected in real time and continuously transmitted to the analog input module of the temperature control instrument (XM).

[0028] Step 200, the central processing unit (CPU) of the temperature control instrument (XM) converts the 4-20mA current signal input by the sensor into a digital temperature value through the analog-to-digital conversion module (A / D) and stores it in the internal register. The preset temperature threshold range of the instrument is set by the operator through the panel keys. For example, the lower limit threshold is 450°C and the upper limit threshold is 480°C (the specific values can be adjusted according to requirements).

[0029] Step 201, when the temperature control instrument (XM) detects that the zinc liquid temperature is lower than the preset lower limit threshold (such as 450°C), the internal logic circuit triggers the action of the low-temperature signal output relay. The output terminal of this relay is connected to the coil terminal of the second intermediate relay (KA2), and the 220V AC power supply supplies power to KA2 through the output terminal of the temperature control instrument. The normally open contact of KA2 is connected to the input terminal I0.0 of the programmable logic controller (PLC). When the coil of KA2 is powered on, the normally open contact closes and sends a high-level low-temperature instruction (logical "1" signal) to the PLC.

[0030] Step 202, if the zinc liquid temperature is higher than the preset upper limit threshold (such as 480°C), the high-temperature signal output relay inside the temperature control instrument (XM) is activated, and its output terminal is connected to the coil of the first intermediate relay (KA1). The normally open contact of KA1 is connected to the input terminal I0.1 of the PLC. When the coil of KA1 is powered on, the normally open contact closes and sends a high-level high-temperature instruction (logical "1" signal) to the PLC. Fuses (FU) are connected in series in the coil circuits of the intermediate relays (KA1, KA2) to prevent component damage caused by current overload; RC absorption circuits are connected in parallel across the contacts to suppress the electromagnetic interference during switching and ensure the stability of signal transmission.

[0031] The temperature sensor samples at high frequency and transmits signals through a shielded cable to avoid signal attenuation in the high-temperature environment of the zinc pot. The temperature control instrument automatically outputs high and low temperature signals according to the preset thresholds, replacing manual inspection and manual adjustment, and at the same time avoiding temperature fluctuations caused by human misjudgment. By amplifying the output signal of the temperature control instrument through KA1 and KA2, it can drive long-distance cable transmission (up to 100 meters at most), and isolate the strong and weak electrical circuits to prevent the PLC input module from being interfered by strong electricity, improving the reliability of the system. After the high and low temperature signals are processed by the PLC logic, they can quickly trigger the power switching of the inductor (such as switching from a low power of 20KW to a high power of 400KW), so that the temperature fluctuation range of the zinc liquid is controlled within ±5°C, meeting the strict requirements of the hot-dip galvanizing process for temperature uniformity, and then stabilizing the quality of the product galvanized layer. When the temperature is abnormally beyond the threshold, the signal transmission link can synchronously trigger an audible and visual alarm device (not mentioned in the document but can be extended), reminding the operator to check for potential hazards, avoiding overheating damage of the inductor or rapid deposition of zinc slag caused by temperature runaway, and extending the service life of the equipment.

[0032] In a preferred embodiment of the present invention, in step 3 above, the programmable logic controller 3 controls the contactor group to switch the output voltage of the autotransformer 4 based on the temperature signal, so that the inductor operates in a low-power, medium-power or high-power mode. The low-power gear is 120V, the high-power gear is 500V, and the medium-power gear is 200V. It may include: Step 300, when receiving a low-temperature instruction, trigger the coil of the sixth contactor 7. The normally open contact of the sixth contactor 7 closes to trigger the coil of the third contactor 8. The main contact of the third contactor 8 connects to the low-power gear of the autotransformer 4, so that the inductor operates at 20KW. Step 301, when receiving a high-temperature instruction, trigger the coil of the fourth contactor 9. The normally open contact of the fourth contactor 9 closes to trigger the coil of the first contactor 10. The main contact of the first contactor 10 connects to the high-power gear of the autotransformer 4, so that the inductor operates at 400KW. Step 302, when there is no high or low temperature instruction, trigger the coil of the fifth contactor 11. The normally open contact of the fifth contactor 11 closes to trigger the coil of the second contactor 12. The main contact of the second contactor 12 connects to the medium-power gear of the autotransformer 4, so that the inductor operates at 160KW. Step 303, wherein, the first contactor 10, the second contactor 12, and the third contactor 8 avoid simultaneous conduction through an interlock circuit.

[0033] In an embodiment of the present invention, when the input terminal I0.0 of the programmable logic controller (PLC) receives a low-temperature instruction (high-level signal) from the second intermediate relay (KA2), the corresponding contact I0.0 in the internal ladder diagram program of the PLC closes, triggering the coil of the output relay Q0.5 to be energized. The output terminal of Q0.5 is connected to the coil terminal of the sixth contactor (KM6) through a 24V DC power supply to form an energized circuit.

[0034] Contactor action process: After the KM6 coil is energized, its normally open contact KM6-1 closes (located in the control circuit). This contact is connected in series with the coil of the third contactor (KM3) in a 220V AC circuit. After KM6-1 closes, the KM3 coil is energized, and its main contact KM3-1 (located in the main circuit) connects to the 120V output terminal of the autotransformer (TB). At this time, the inductor (DL) is connected to 120V voltage. According to the power formula calculation (P = U 2÷R), and the actual operating power is 20 KW (low-power mode). Here, P represents the electric power consumed by the inductor (DL); U is the effective voltage applied across the inductor (DL); and R is the internal resistance of the inductor (DL). The low-power tap of the autotransformer TB is connected to the incoming line terminal of the main contact of KM3 through a copper bar, and the outgoing line terminal is directly connected to the input terminal of the inductor DL. In the control circuit, 1 A fuses (FU) are connected in series in the coil circuits of both KM6 and KM3 to prevent short circuits and overloads; a 0.1 μF / 400 V RC absorption circuit is connected in parallel across the coil terminals to suppress electromagnetic interference.

[0035] Step 301, when the high-temperature instruction of the first intermediate relay (KA1) is received at the PLC input terminal I0.1, the internal program of the PLC triggers the output relay Q0.3 to be energized. The output terminal of Q0.3 is connected to the coil of the fourth contactor (KM4) through a 24 V power supply, so that the coil of KM4 is energized. After the coil of KM4 is energized, its normally open contact KM4-1 closes, connecting the coil circuit (220 V AC) of the first contactor (KM1). After the coil of KM1 is energized, the main contact KM1-1 connects to the 500 V output terminal of the autotransformer TB, and the inductor DL is connected to 500 V voltage, and the operating power is increased to 400 KW (high-power mode). The main contact of KM1 is made of silver alloy material with a rated current of 1000 A, meeting the on-off requirements under 400 KW power; a thermal relay (FR) is set in the control circuit, which automatically cuts off the power supply when the current of the KM1 coil exceeds the rated value to prevent the contactor from overheating and being damaged.

[0036] Step 302, when the PLC does not detect the input signals of I0.0 (low temperature) and I0.1 (high temperature), the internal program defaults to trigger the output relay Q0.4 to be energized, which is connected to the coil of the fifth contactor (KM5).

[0037] Circuit conduction in medium-power mode: After the coil of KM5 is energized, the normally open contact KM5-1 closes, triggering the coil circuit of the second contactor (KM2). The main contact KM2-1 of KM2 connects to the 200 V output terminal of the autotransformer TB, and the inductor DL operates at 200 V voltage, corresponding to a power of 160 KW (medium-power mode).

[0038] The 200 V tap of the autotransformer TB is located between the 120 V and 500 V taps. When switching, a 0.5-second delay is set through the PLC program to avoid current impact caused by voltage mutation and ensure the smooth change of the magnetic flux of the inductor.

[0039] In step 303, in the control circuits of the first contactor KM1, the second contactor KM2, and the third contactor KM3, normally closed contacts of the other two contactors are respectively connected in series. For example, in the coil circuit of KM1, the normally closed contacts KM2-2 and KM3-2 of KM2 and KM3 are connected in series to ensure that when the coil of KM1 is energized, the coil circuits of KM2 and KM3 are cut off and cannot be conducted simultaneously. The normally closed contacts adopt a bridge-type double-break structure and are installed on the auxiliary contact module of the contactor body. The wires of the interlock circuit are marked in red to distinguish them from other control circuits; a warning label of "Short-circuiting of the interlock circuit is strictly prohibited" is set at the terminal block to prevent misoperation during maintenance.

[0040] Adopt a three-level power regulation mechanism of low power, medium power, and high power to narrow the temperature fluctuation range of the zinc bath. Compared with the traditional two-stage regulation, the temperature uniformity is greatly improved, meeting the strict requirements of the hot-dip galvanizing process for temperature stability. Through the mechanical interlock circuit design, the risk of simultaneous conduction of the power contactors is completely avoided, ensuring the safe operation of the autotransformer. This mechanism has extremely high response speed and durability, can withstand frequent switching of working conditions, and effectively extends the service life of the equipment. Based on the temperature signal, intelligent switching of power levels is realized, and the response speed is significantly better than manual operation. For example, when the temperature of the zinc bath approaches the set threshold, the medium-power mode automatically intervenes to reduce the energy consumption loss caused by the direct switching between high and low powers, and the power utilization rate is significantly improved. The medium-power mode plays a core role in the temperature stable stage, significantly reducing the power consumption compared with the high-low power switching mode, and considerable economic benefits can be generated during long-term operation. The status of the contactor is fed back through the real-time monitoring system, and the protection mechanism is automatically triggered in case of abnormal status. Maintenance personnel can quickly obtain fault information through the human-machine interface, shortening the fault location time and improving the maintainability of the system.

[0041] In a preferred embodiment of the present invention, in step 4 above, sending a gouging start instruction to the programmable logic controller 3 through the touch screen and immediately cutting off the control logic of the temperature control mode may include: The touch screen generates a pulsed start signal and transmits it to the input port of the programmable logic controller 3. The programmable logic controller 3 disconnects the coil control circuits of the fourth contactor 9, the fifth contactor 11, and the sixth contactor 7, and blocks the output signals of the temperature control instrument 2 to the first intermediate relay 5 and the second intermediate relay 6.

[0042] In an embodiment of the present invention, the touch screen (human-machine interface) is connected to the communication module of the programmable logic controller (PLC) (such as Port0 of CPU224XP) through an RS-485 communication cable, and the communication protocol adopts ModbusRTU. The "gutter start" button on the touch screen is a self-resetting button, and when pressed, it generates a 24V DC pulse signal lasting for 500ms. The high level of the pulse signal is 24V (corresponding to logic "1"), and the low level is 0V (logic "0"), which is accessed through the digital input module of the PLC (such as I0.2 port of EM221). There is an optoelectronic isolation circuit inside the input port to prevent electrical interference on the touch screen side from affecting the operation of the PLC.

[0043] PLC's logical processing of the received pulse signal: When the I0.2 port of the PLC detects a 24V high level, the rising edge detection instruction (such as EU) in the internal ladder diagram program is triggered, causing the output relays Q0.0 to Q0.2 to be set to "1" within one scan cycle.

[0044] The output terminals of Q0.0, Q0.1, and Q0.2 are respectively connected to the coil circuits of the fourth contactor (KM4), the fifth contactor (KM5), and the sixth contactor (KM6). When Q0.0 to Q0.2 are set to "1", the corresponding output relay contacts are disconnected, cutting off the 24V DC power supply of KM4, KM5, and KM6, causing the coils of these three contactors to lose power, and the normally open contacts to reset and disconnect. The relay contacts of the PLC output module (such as Q0.0) are connected in series in the coil circuits of KM4, KM5, and KM6. When the contacts are disconnected, the coils lose power, and as a result, the KM1, KM2, and KM3 contactors they control cannot conduct (because the normally open contacts of KM4 - KM6 are the triggering conditions for the coils of KM1 - KM3).

[0045] Blocking the output signal of the temperature control instrument to the intermediate relay: The PLC controls an intermediate relay (KA3) through the Q0.3 port of the digital output module. The normally closed contact of KA3 is connected in series in the signal transmission circuit between the temperature control instrument (XM) and the first intermediate relay (KA1) and the second intermediate relay (KA2).

[0046] Specific action process: When the PLC receives the gutter start signal, Q0.3 is set to "1", the coil of KA3 is energized, and its normally closed contact KA3-1 is disconnected, cutting off the 220V AC signal circuit output from the temperature control instrument XM to KA1 and KA2. At this time, regardless of how the zinc liquid temperature changes, the high and low temperature signals of XM cannot be transmitted to the PLC through KA1 and KA2, completely blocking the logic chain of the temperature control mode.

[0047] Hardware isolation between the gutter mode and the temperature control mode: In the control circuit of KM4 - KM6, in addition to the PLC output contacts, a hardware interlock switch (SA1) in the gully mode is connected in parallel. When SA1 is closed, the coil power supply of KM4 - KM6 is forcibly disconnected, ensuring that the temperature control mode completely fails during the gully process and avoiding circuit failures caused by conflicts between the two modes.

[0048] By cutting off the relay circuit related to temperature control, it is ensured that the inductor maintains a stable high - power operation state during the gully process, avoiding power - switching interruptions caused by temperature fluctuations. This mechanism guarantees the complete execution of each gully operation and improves the zinc slag cleaning effect. The signal - blocking technology is adopted to prevent the simultaneous activation of the temperature control mode and the gully mode. This design completely avoids the current impact caused by frequent power switching and effectively extends the service life of key components of the equipment (such as the inductor coil). Based on the high - speed pulse triggering mechanism, the mode - switching action is completed in an extremely short time to ensure that the gully command takes effect immediately. This technology shortens the residence time of zinc slag in the runner and improves the cleaning efficiency.

[0049] Through the dual - protection mechanism of hardware interlock and electrical isolation, the physical isolation between the gully mode and the temperature control mode is achieved, significantly improving the system stability and anti - interference ability. At the same time, the operation log automatic recording function provides efficient support for equipment status tracing and maintenance troubleshooting. During the gully process, the temperature control signal is actively blocked, fundamentally avoiding the zinc liquid temperature fluctuation caused by power switching. This design qualitatively improves the uniformity of the galvanized layer thickness and reduces the product defect rate.

[0050] In a preferred embodiment of the present invention, for the above - mentioned step 5, the programmable logic controller 3 sequentially and cyclically triggers the high - power contactors of each inductor in a preset order, and each time a single inductor operates at high power for a preset duration, and the remaining inductors are synchronously switched to the low - power operation state, which may include: Step 500, after receiving the gully start command, immediately disconnect the outputs of the fourth contactor 9, the fifth contactor 11, and the sixth contactor 7 in the temperature control mode; Step 501, select the first inductor, trigger the coil of the fourth contactor 9 corresponding to the first inductor, the normally open point of the fourth contactor 9 closes to trigger the coil of the first contactor 10, so that the first inductor is connected to the 500V high - power gear, and at the same time, force the remaining inductors to trigger the coil of the sixth contactor 7, the normally open point of the sixth contactor 7 closes to trigger the coil of the third contactor 8, so that the remaining inductors are connected to the 120V low - power gear.

[0051] In an embodiment of the present invention, the I0.2 port of the digital input module (such as EM221) of the programmable logic controller (PLC) is connected to the signal line of the groove start button of the touch screen. When the button is pressed, a 24V DC pulse signal is input. After the PLC internal program detects this signal, it immediately outputs a low-level signal through the Q0.3, Q0.4, and Q0.5 ports of the digital output module (such as EM222), respectively corresponding to cutting off the coil power supply circuits of the fourth contactor (KM4), the fifth contactor (KM5), and the sixth contactor (KM6).

[0052] Circuit cut-off details: Relay contacts of the PLC output module (such as Q0.3 controls KM4) are connected in series in the coil circuits of KM4, KM5, and KM6. When the PLC outputs a low level, the relay contacts are disconnected, and the 24V DC power supply cannot be connected to the coil, resulting in KM4, KM5, and KM6 losing power. Their normally open contacts reset and disconnect, thereby cutting off the trigger signals for controlling the first contactor (KM1), the second contactor (KM2), and the third contactor (KM3) in the temperature control mode.

[0053] Step 501, the PLC internally stores an inductor address register (such as V100.0 - V100.7), and the default address of the first inductor is V100.0. After the groove starts, the PLC scans this register and first activates the output port (such as Q0.3) corresponding to the first inductor. This port is connected to the coil of the fourth contactor (KM4-1) of the first inductor, making the KM4-1 coil energized.

[0054] High-power mode trigger process: After the KM4-1 coil is energized, its normally open contact KM4-1-1 closes, connecting the coil circuit (220V AC) of the first contactor (KM1-1). The main contacts of KM1-1 close, connecting the 500V high-power gear of the autotransformer (TB). The first inductor is connected to 500V voltage and operates at a power of 400KW. At this time, a strong magnetic field is generated in the primary coil of the first inductor, driving the zinc liquid in its melting groove to flow at high speed.

[0055] Low-power switching mechanism for the remaining inductors: The PLC batch-triggers the coils of the sixth contactors (KM6-n) of the remaining inductors (n≥2) through the output port Q0.5. After the KM6-n coils are energized, the normally open contacts KM6-n-1 close, triggering the coils of the third contactors (KM3-n), making the main contacts of KM3-n connect to the 120V low-power gear of TB. The remaining inductors operate at a power of 20KW. During this process, the PLC ensures that the high-power and low-power contactors do not conduct simultaneously through a hardware interlock circuit (the normally closed contacts of KM1-n and KM3-n are connected in series).

[0056] The high-power operation duration of the first inductor is set by an internal timer of the PLC (such as T37), with a default of 30 seconds. After the timer counts down, the PLC automatically switches to the address register of the next inductor and repeats the above triggering process. A 1A fuse is connected in series in the coil circuit of all contactors, and an RC absorption circuit (0.1 μF / 400V) is connected in parallel across the main contacts to suppress the arc interference during switching.

[0057] When a single inductor operates at high power, it generates a high-intensity electromagnetic field, driving the zinc liquid to form a high-speed flow, effectively peeling off the zinc slag deposited on the inner wall of the melting groove. The scouring efficiency has achieved a breakthrough improvement. The rest of the inductors maintain a low-power operation state to ensure the overall temperature stability of the zinc pot and avoid interfering with the continuity of the hot-dip galvanizing process during the scouring operation. The single-inductor cyclic high-power operation mode has achieved a qualitative leap in the power utilization efficiency compared with the multi-inductor synchronous high-power condition, reducing the total system energy consumption. It avoids the risk of coil overheating caused by multiple inductors operating at high power simultaneously. The working temperature of key components (such as windings) is effectively controlled, and the service life of the equipment has been extended by leaps and bounds. The cyclic scouring mechanism has reduced the zinc slag deposition in the melting groove by several orders of magnitude, extended the manual cleaning cycle, and compressed the maintenance operation time. The temperature uniformity of the zinc liquid has reached a new height in the industry, the fluctuation range of the galvanized layer thickness has achieved a breakthrough narrowing, and the product yield rate has exceeded the industry benchmark. The hardware interlock and the PLC control logic form a three-dimensional protection network to eliminate the electrical safety risks during the power switching process, and the system stability has been verified through harsh working conditions. It supports the flexible expansion of the number of inductors. Only by adjusting the control logic parameters can it adapt to zinc pot systems of different scales without hardware modification, reducing the production line upgrade cost.

[0058] In a preferred embodiment of the present invention, in step above, when using the strong electromagnetic force generated by the inductor during high-power operation to drive the zinc liquid to scour the inner wall of the melting groove at high speed, peeling off and discharging the deposited zinc slag, after completing the cyclic scouring operation of all inductors, the programmable logic controller 3 automatically switches back to the temperature control mode and re-enters the cycle of temperature monitoring and power regulation, which may include: Step , during high-power operation, the inductor forms a strong alternating electromagnetic field in the melting groove, acting on the zinc liquid to generate a directional Lorentz force, driving the zinc liquid to scour the inner wall of the melting groove at high speed, mechanically peeling off the attached zinc slag; the peeled zinc slag flows out with the zinc liquid and is discharged to the deposition area of the main body of the zinc pot; Step , after the cyclic scouring of all inductors is completed, the programmable logic controller 3 disconnects the outputs of all fourth contactors 9; restores the temperature control logic control authority of the fourth contactor 9, the fifth contactor 11, and the sixth contactor 7; and reactivates the closed-loop temperature regulation link of the temperature sensor 1, the temperature control instrument 2, and the programmable logic controller 3.

[0059] In an embodiment of the present invention, when the inductor operates at a high power of 500V / 400KW, three-phase alternating current is passed through its coil, generating an alternating magnetic field with a frequency of 50Hz in the iron core (laminated silicon steel sheets). The liquid zinc in the melting groove acts as a conductive medium, cutting the alternating magnetic induction lines to generate an induced current (eddy current). The direction of the current follows Lenz's law and is opposite to the direction of the current in the primary coil.

[0060] Generation of Lorentz force and zinc liquid drive: The induced current is affected by the Lorentz force in the alternating magnetic field. The direction of the force is determined by the left-hand rule (magnetic field direction × current direction → force direction). This force drives the zinc liquid to flow directionally and at high speed along the "day"-shaped holes in the melting groove, with a flow rate of up to 3m / s (1.2m / s under the conventional temperature control mode). When the zinc liquid scours the inner wall of the melting groove at high speed, a shear force (≥50Pa) is generated on the attached zinc slag, exceeding the adhesion force between the zinc slag and the refractory material (about 30Pa), causing the zinc slag to peel off. The peeled zinc slag flows with the zinc liquid through the communication port between the melting groove and the main body of the zinc pot and is discharged into the deposition area at the bottom of the zinc pot. The melting groove is designed in a "day" shape, and its curved structure enhances the turbulence effect of the zinc liquid, further improving the zinc slag peeling efficiency.

[0061] Step 601: When the internal counter of the PLC (such as C10) records that all inductors have completed a high-power flushing (assuming n inductors and the counter value = n), the PLC disconnects the coil power supply of all fourth contactors (KM4-1 to KM4-n) through the digital output module (the Q0.3 port outputs a low level), causing the main contacts of KM4 to open and cutting off the high-power gear (500V) of the inductor. The PLC simultaneously outputs a high level to the Q0.3, Q0.4, and Q0.5 ports to reactivate the control circuits of KM4, KM5, and KM6. At this time, the high and low temperature signals transmitted by the temperature control instrument (XM) to the PLC through the intermediate relays (KA1, KA2) become effective again, and the normally open contacts of KM4-KM6 can normally trigger the KM1-KM3 contactors to achieve power switching of the inductor. The temperature sensor (RT) transmits the zinc liquid temperature signal (4-20mA) to XM again. XM outputs high and low temperature signals to KA1 and KA2 according to the threshold (such as 450-480°C). After logical processing by the PLC, it controls KM1-KM3 to make the inductor operate in the temperature control mode (low power 20KW, medium power 160KW, high power 400KW). During this process, the PLC ensures that KM1-KM3 are not conducted simultaneously through the interlock circuit.

[0062] The strong electromagnetic field generated during high-power operation drives the zinc liquid to form a high-speed scouring effect, significantly improving the zinc slag stripping efficiency on the inner wall of the melting groove, effectively avoiding the attenuation of the inductor current caused by zinc slag deposition, and maintaining the stability of power output. After the scouring is completed, the system instantaneously switches back to the temperature control mode to ensure that the temperature of the zinc liquid quickly returns to the set range, and the temperature fluctuation amplitude is substantially narrowed, meeting the stringent requirements of high-end galvanized products for temperature uniformity. The reduction in the amount of zinc slag deposition extends the service life of the core components of the inductor. At the same time, the frequency of manual cleaning is reduced by an order of magnitude, the single maintenance operation time is significantly compressed, and the operation and maintenance costs are structurally optimized. The full-process automatic control completely avoids manual operation errors. The seamless switching between the scouring and temperature control modes ensures the consistency of the galvanizing process, and the product defect rate drops by a large margin. The coordinated operation mode of single-point high power and global low power reconstructs the energy consumption structure, achieving a substantial improvement in the electrical energy utilization efficiency compared with the traditional parallel high-power mode. When specifically applied, it is composed of a zinc pot body (a cuboid for containing zinc liquid) and an inductor (installed on the outside). The melting groove inside the inductor is connected to the zinc pot body, and the zinc liquid is heated through convective heat exchange. It adopts a three-phase three-wire system, including a molded case circuit breaker (QS), an autotransformer (TB, with three output voltage levels of 120V / 200V / 500V), and at least two inductors (DL). The DLs are connected in parallel to the output terminal of the TB. The temperature sensor (RT) is immersed in the zinc liquid to monitor the temperature in real time and transmit it to the temperature control instrument (XM). The programmable logic controller (PLC) receives the high and low temperature signals from the XM and the scouring instruction from the touch screen, and outputs a control signal to the contactor group. The intermediate relays (KA1, KA2) amplify the signals, and the contactors (KM1-KM6) control the voltage switching of the TB. Among them, KM1-KM3 correspond to the high / medium / low power levels, and KM4-KM6 are the trigger components for mode switching.

[0063] The realization of temperature closed-loop control in the temperature control mode: The RT collects the temperature of the zinc liquid at a frequency of 1 time per second and transmits it to the XM through a 4-20mA current signal. The XM compares the temperature value with the preset threshold (such as 450-480°C): If the temperature < lower limit (450°C), the XM outputs a low-temperature signal to the KA2, and the normally open contact of the KA2 closes to send a low-temperature instruction to the PLC; If the temperature > upper limit (480°C), the XM outputs a high-temperature signal to the KA1, and the normally open contact of the KA1 closes to send a high-temperature instruction to the PLC.

[0064] Automatic adjustment of inductor power: Low-power mode (20KW / 120V): After the PLC receives the low-temperature instruction, it triggers the KM6 coil. The normally open contact of the KM6 closes to trigger the KM3 coil, and the main contact of the KM3 connects to the 120V gear of the TB; High-power mode (400KW / 500V): After the PLC receives the high-temperature instruction, it triggers the KM4 coil. The normally open contact of KM4 closes to trigger the KM1 coil, and the main contact of KM1 connects to the 500V gear of TB. Medium-power mode (160KW / 200V): When there is no high or low-temperature instruction, the PLC triggers the KM5 coil. The normally open contact of KM5 closes to trigger the KM2 coil, and the main contact of KM2 connects to the 200V gear of TB.

[0065] Normally closed contacts are connected in series with each other in the control circuits of KM1, KM2, and KM3 to ensure that the three do not conduct simultaneously and prevent phase-to-phase short circuit of TB.

[0066] Triggering and cyclic flushing of the flushing groove mode: The operator presses the "Flushing Start" button on the touch screen to generate a 500ms pulse signal to the I0.2 port of the PLC. The PLC immediately cuts off the power supply of the KM4, KM5, and KM6 coils, and at the same time cuts off the signal transmission from XM to KA1 and KA2 through the intermediate relay KA3, completely blocking the temperature control logic.

[0067] High-power operation of a single inductor and low-power operation of the rest: Triggering of the first inductor: The PLC activates the KM4 coil of the first inductor in the preset order. The normally open contact of KM4 triggers the KM1 coil, enabling the inductor to be connected to the 500V high-power gear (400KW). The zinc liquid in its melting groove generates a directional flow with a velocity of 3m / s due to the strong electromagnetic force. Low-power operation of the remaining inductors: The PLC forcibly triggers the KM6 coils of the remaining inductors. The normally open contacts of KM6 trigger the KM3 coils, connecting to the 120V low-power gear (20KW) to maintain the overall temperature of the zinc pot.

[0068] After the internal timer of the PLC (such as 30 seconds) finishes timing, it switches to trigger the KM4 of the next inductor, repeating the "single high-power + low-power of the rest" mode until all inductors complete flushing. During high-power operation, the inductor coil generates an alternating magnetic field. The induced current in the zinc liquid is driven by the Lorentz force to rapidly scour the inner wall of the melting groove. The shear force (≥50Pa) peels off the attached zinc slag, and the zinc slag is discharged into the zinc pot deposition area with the zinc liquid. After all inductors complete flushing, the PLC disconnects all KM4 coils and restores the temperature control logic control authority of KM4 - KM6: RT re-transmits the temperature signal to XM, and XM sends high and low-temperature instructions to the PLC through KA1 / KA2. The PLC controls KM1 - KM3 to achieve power switching and re-enters the temperature closed-loop regulation.

[0069] As Figure 2 shown, the embodiment of the present invention also provides a zinc slag self-cleaning inductor operation control device based on cyclic flushing, including: The main circuit module is used to construct a three-phase three-wire circuit, including a molded case circuit breaker 13 connected to the three-phase power input terminals, an autotransformer 4 connected to the molded case circuit breaker 13 through the input terminals and providing three adjustable voltage levels at the output terminals, and at least two inductors connected in parallel to the output terminals of the autotransformer 4. The melting grooves of each inductor are connected to the zinc pot body; The signal acquisition module is used to monitor and transmit temperature signals in real time, including a temperature sensor 1 immersed in the zinc pot body to monitor the temperature of the zinc liquid, and a temperature control instrument 2 receiving the signal from the temperature sensor 1 and outputting a high-temperature or low-temperature signal; The logic control module is used to process control signals and perform logic operations, including a programmable logic controller 3 receiving high-temperature or low-temperature instructions from the temperature control instrument 2; responding to the pulse start signal of the touch screen; a first intermediate relay 5 and a second intermediate relay 6 respectively transmitting the high-temperature and low-temperature instructions of the temperature control instrument 2 to the programmable logic controller 3; The power switching module is used to adjust the power of the inductor, including the programmable logic controller 3 controlling the contactor group to switch the output voltage of the autotransformer 4 based on the temperature instruction, so that the inductor operates in a low-power, medium-power or high-power mode; The interlock protection module is used to mutually exclude and conduct the coil power supply circuits of the first contactor 10, the second contactor 12, and the third contactor 8; The human-machine interaction module is used to realize human-machine signal interaction, including a touch screen communicatively connected to the programmable logic controller 3 and generating a pulse start signal to activate the flushing groove module.

[0070] It should be noted that this device corresponds to the above method. All implementation manners in the above method embodiments are applicable to this embodiment and can achieve the same technical effects.

[0071] An embodiment of the present invention also provides a computing device, including: a processor and a memory storing a computer program. When the computer program is run by the processor, it executes the method as described above. All implementation manners in the above method embodiments are applicable to this embodiment and can achieve the same technical effects.

[0072] An embodiment of the present invention also provides a computer-readable storage medium storing instructions. When the instructions are run on a computer, the computer is made to execute the method as described above. All implementation manners in the above method embodiments are applicable to this embodiment and can achieve the same technical effects.

[0073] The above is the preferred implementation manner of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle described in the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A method for controlling the operation of a zinc slag self-cleaning inductor based on a circulating gully, characterized in that The method includes the following steps: Step 1: The temperature of the zinc liquid in the zinc pot is monitored in real time by a temperature sensor (1), and the temperature signal is transmitted to a temperature control instrument (2). Step 2: The temperature control instrument (2) processes the temperature signal according to a set threshold and outputs a high-temperature or low-temperature signal to a programmable logic controller (3). Step 3: Based on the temperature signal, the programmable logic controller (3) controls the contactor group to switch the output voltage of the autotransformer (4) so that the inductor operates in a low-power, medium-power, or high-power mode. Step 4: A gouging start instruction is sent to the programmable logic controller (3) through a touch screen, and the control logic of the temperature control mode is immediately cut off. Step 5: The programmable logic controller (3) sequentially triggers the high-power contactors of each inductor in a preset order. Each time, a single inductor operates at high power for a preset duration, and the remaining inductors are synchronously switched to the low-power operating state. Step 6: The strong electromagnetic force generated by the inductor during high-power operation is used to drive the zinc liquid to rapidly scour the inner wall of the melting groove, stripping and discharging the deposited zinc slag. After the cyclic gouging operation of all inductors is completed, the programmable logic controller (3) automatically switches back to the temperature control mode and re-enters the cycle of temperature monitoring and power regulation.

2. The zinc slag self-cleaning inductor operation control method based on a circulating gully according to claim 1, characterized in that, The temperature control instrument (2) processes the temperature signal according to a set threshold and outputs a high-temperature or low-temperature signal to the programmable logic controller (3), including: The temperature control instrument (2) receives the real-time zinc liquid temperature data from the temperature sensor (1). When the zinc liquid temperature is lower than the lower limit of the preset threshold, a low-temperature signal is output to a second intermediate relay (6), and a low-temperature instruction is sent to the programmable logic controller (3) through the normally open contact of the second intermediate relay (6). When the zinc liquid temperature is higher than the upper limit of the set threshold, a high-temperature signal is output to a first intermediate relay (5), and a high-temperature instruction is sent to the programmable logic controller (3) through the normally open contact of the first intermediate relay (5).

3. The zinc slag self-cleaning inductor operation control method based on a circulating gully according to claim 2, characterized in that Based on the temperature signal, the programmable logic controller (3) controls the contactor group to switch the output voltage of the autotransformer (4) so that the inductor operates in a low-power, medium-power, or high-power mode, including: When receiving the low-temperature instruction, the coil of the sixth contactor (7) is triggered. The normally open point of the sixth contactor (7) closes to trigger the coil of the third contactor (8). The main contacts of the third contactor (8) connect to the low-power gear of the autotransformer (4), and the inductor operates at 20KW. When receiving the high-temperature instruction, the coil of the fourth contactor (9) is triggered. The normally open point of the fourth contactor (9) closes to trigger the coil of the first contactor (10). The main contacts of the first contactor (10) connect to the high-power gear of the autotransformer (4), and the inductor operates at 400KW. When there is no high- or low-temperature instruction, the coil of the fifth contactor (11) is triggered. The normally open point of the fifth contactor (11) closes to trigger the coil of the second contactor (12). The main contacts of the second contactor (12) connect to the medium-power gear of the autotransformer (4), and the inductor operates at 160KW. Among them, the first contactor (10), the second contactor (12), and the third contactor (8) are prevented from conducting simultaneously through an interlock circuit.

4. The zinc slag self-cleaning inductor operation control method based on a circulating gully according to claim 3, characterized in that, The low-power gear is 120V, the high-power gear is 500V, and the medium-power gear is 200V.

5. The zinc slag self-cleaning inductor operation control method based on a circulating gully according to claim 4, wherein, Send the scouring ditch start instruction to the programmable logic controller (3) through the touch screen, and immediately cut off the control logic of the temperature control mode, including: The touch screen generates a pulsed start signal and transmits it to the input port of the programmable logic controller (3). The programmable logic controller (3) disconnects the coil control circuits of the fourth contactor (9), the fifth contactor (11), and the sixth contactor (7), and blocks the output signals from the temperature control instrument (2) to the first intermediate relay (5) and the second intermediate relay (6).

6. The zinc slag self-cleaning inductor operation control method based on a circulating gully according to claim 5, characterized in that, The programmable logic controller (3) sequentially triggers the high-power contactors of each inductor in a preset order, each time causing a single inductor to operate at high power for a preset duration, and the remaining inductors are synchronously switched to the low-power operating state, including: After receiving the scouring ditch start instruction, immediately disconnect the outputs of the fourth contactor (9), the fifth contactor (11), and the sixth contactor (7) in the temperature control mode; Select the first inductor, trigger the coil of the fourth contactor (9) corresponding to the first inductor. The normally open contact of the fourth contactor (9) closes to trigger the coil of the first contactor (10), enabling the first inductor to be connected to the 500V high-power gear. At the same time, force the remaining inductors to trigger the coil of the sixth contactor (7). The normally open contact of the sixth contactor (7) closes to trigger the coil of the third contactor (8), enabling the remaining inductors to be connected to the 120V low-power gear.

7. The zinc slag self-cleaning inductor operation control method based on a circulating gully according to claim 6, characterized in that, Use the strong electromagnetic force generated by the inductor during high-power operation to drive the zinc liquid to scour the inner wall of the melting groove at high speed, peel off and discharge the deposited zinc slag. After completing the cyclic scouring operation of all inductors, the programmable logic controller (3) automatically switches back to the temperature control mode and re-enters the cycle of temperature monitoring and power regulation, including: During high-power operation, the inductor forms a strong alternating electromagnetic field in the melting groove, which acts on the zinc liquid to generate a directional Lorentz force, driving the zinc liquid to scour the inner wall of the melting groove at high speed and mechanically peeling off the attached zinc slag; the peeled zinc slag flows out with the zinc liquid and is discharged to the deposition area of the main body of the zinc pot; After the cyclic scouring of all inductors is completed, the programmable logic controller (3) disconnects the outputs of all fourth contactors (9); restores the temperature control logic control authority of the fourth contactor (9), the fifth contactor (11), and the sixth contactor (7); and reactivates the closed-loop temperature regulation link of the temperature sensor (1), the temperature control instrument (2), and the programmable logic controller (3).

8. A zinc slag self-cleaning inductor operation control device based on a circulating gully, the device implementing the method according to any one of claims 1 to 7, characterized in that, Including: The main circuit module is used to construct a three-phase three-wire circuit, including a molded case circuit breaker (13) connected to the three-phase power input terminals, an autotransformer (4) connected to the molded case circuit breaker (13) through the input terminals and providing three adjustable voltage levels at the output terminals, and at least two inductors connected in parallel to the output terminals of the autotransformer (4). The melting groove of each inductor is connected to the main body of the zinc pot; The signal acquisition module is used to monitor and transmit temperature signals in real time, including a temperature sensor (1) immersed in the main body of the zinc pot to monitor the temperature of the zinc liquid, and a temperature control instrument (2) receiving the signal from the temperature sensor (1) and outputting a high-temperature or low-temperature signal; A logic control module, which is used to process control signals and perform logic operations, including that a programmable logic controller (3) receives high-temperature or low-temperature instructions from a temperature control instrument (2); responds to a pulse start signal of a touch screen; a first intermediate relay (5) and a second intermediate relay (6) respectively transmit the high-temperature and low-temperature instructions of the temperature control instrument (2) to the programmable logic controller (3); A power switching module, which is used to adjust the power of the inductor, and includes that the programmable logic controller (3) controls the contactor group to switch the output voltage of the autotransformer (4) based on the temperature instruction, so that the inductor operates in a low-power, medium-power or high-power mode; An interlock protection module, which is used to mutually exclusive conduct the coil power supply circuits of the first contactor (10), the second contactor (12) and the third contactor (8); A human-machine interaction module, which is used to realize human-machine signal interaction, and includes a touch screen that is communicatively connected to the programmable logic controller (3) and generates a pulse start signal to activate the gully module.

9. A computing device, characterized in that, Comprising: One or more processors; A storage device for storing one or more programs, which when executed by the one or more processors cause the one or more processors to implement the method according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, A program is stored in the computer-readable storage medium, and when the program is executed by a processor, the method according to any one of claims 1 to 7 is implemented.

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