Method for preventing abnormal damage of hydraulic pump of hydraulic station of movable smoke hood of converter

Abstract

The invention relates to a method for preventing abnormal damage of a hydraulic pump of a converter movable smoke hood hydraulic station. According to the method, three pump stopping setting signals of ultralow liquid level, ultrahigh oil temperature and ultralow pressure are added in an existing electrical control system and used for participating in interlocking protection control. An operator controls the operation of the hydraulic pump through a man-machine operation picture HMI through the closing of a series of normally-open and normally-closed contacts. When any protection linkage signal is set, judgment is carried out through the comparison logic module, and if a preset condition is met, a corresponding counter is started to carry out delayed electrification. And if the condition is still met after the time delay, the corresponding pump stopping setting coil is electrified, and the main pump is stopped from running. And after the main pump stops, the normally closed contact of a series of processed signals is closed, and a control interlocking loop is cut off, so that the system safety is ensured. The stability and safety of the hydraulic system of the movable smoke hood of the converter are effectively improved.

Description

Technical Field

[0001] The invention belongs to the field of automatic control systems related to the operation and protection of a hydraulic pump of a hydraulic station of a movable fume hood of a converter, and relates to a method for preventing abnormal damage to a hydraulic pump of the hydraulic station of a movable fume hood of a converter. Background Art

[0002] In the modern steel smelting process, the converter is one of the key equipment, and its stable operation is crucial to improving production efficiency and product quality. As an important part of the converter, the accuracy and stability of the lifting action of the converter smoke hood directly affect the smooth progress of the converter smelting process. At present, many steel companies use HMI (human-machine interface) to control the lifting action of the movable smoke hood. This operation method has been widely welcomed for its intuitive and convenient characteristics.

[0003] However, in the actual production process, the stability and safety of the electrical control system of the hydraulic pump of the hydraulic station of the converter movable smoke hood still face many challenges. In particular, in the existing PLC (Programmable Logic Controller) logic program, the control system of the main hydraulic pump of the movable smoke hood has not yet added key interlock protection controls such as the hydraulic station liquid level ultra-low pump stop protection signal, oil temperature ultra-high pump stop signal, and pressure ultra-low pump stop signal. This design deficiency makes the system lack an effective self-protection mechanism when encountering common problems such as "running, bubbling, dripping, and leaking", which easily leads to abnormal damage to the main pump of the hydraulic station.

[0004] As the power source for driving the movable smoke hood up and down, the stability of the hydraulic station directly affects the operation effect of the movable smoke hood. When the hydraulic station encounters abnormal conditions such as ultra-low liquid level, ultra-high oil temperature or ultra-low pressure, if the corresponding protective measures are not taken in time, it will cause abnormal wear, overheating or even damage to the hydraulic pump. This not only shortens the service life of the hydraulic pump, but also affects the lifting stability of the converter movable smoke hood, and further affects the continuity of the entire converter smelting process and product quality. Summary of the invention

[0005] In view of this, the purpose of the present invention is to provide a method for preventing abnormal damage to the hydraulic pump of the hydraulic station of the movable smoke hood of the converter, and to solve the technical problem that when the system encounters common problems such as "escape, bubbling, dripping, and leakage", it lacks an effective self-protection mechanism, which easily leads to abnormal damage to the main pump of the hydraulic station.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A method for preventing abnormal damage to a hydraulic pump of a hydraulic station of a movable hood of a converter, the method comprising the following steps:

[0008] S1: In the existing converter movable hood hydraulic station hydraulic pump electrical control system, add the hood hydraulic station liquid level ultra-low pump stop setting signal, the hood hydraulic station oil temperature ultra-high pump stop setting signal and the hood hydraulic station pressure ultra-low pump stop setting signal to participate in the interlocking protection control;

[0009] S2: When the operator operates the hydraulic pump of the converter movable fume hood hydraulic station on the human-machine operation screen HMI, the operation of the main pump of the fume hood hydraulic station is controlled by closing a series of normally open contacts and normally closed contacts;

[0010] S3: When the protection interlock of the ultra-low liquid level stop pump signal, the ultra-high oil temperature stop pump signal, or the ultra-low pressure stop pump signal is set, the ultra-low liquid level stop pump setting signal, the ultra-high oil temperature stop pump setting signal, or the ultra-low pressure stop pump setting signal is compared and judged by the comparison logic module. When the comparison judgment result meets the preset conditions, the corresponding counter is turned on for delay and energized. If the comparison judgment result still meets the preset conditions of the comparison logic module after a certain period of power-on delay, the corresponding stop pump setting coil is energized, thereby stopping the operation of the main pump;

[0011] S4: When the main pump stops running, the control interlocking loop is cut off by closing a series of normally closed contacts of processed signals to ensure system safety.

[0012] Furthermore, in S2, when the operator operates the hydraulic pump of the converter movable hood hydraulic station on the human-machine operation screen HMI, the operation of the main pump of the hood hydraulic station is controlled by closing a series of normally open contacts and normally closed contacts, specifically:

[0013] When the operator operates the hydraulic pump of the converter movable hood hydraulic station on the human-machine operation screen HMI, the centralized normally open contact of the movable hood hydraulic station No. 1 oil pump - B1-HydrPump1-Remote is closed, the hood hydraulic station main pump 1 HMI start normally open contact - B1-HoodHydrStn.MainPump1-HMIStart is closed, the hood hydraulic station main pump 1 HMI stop normally closed contact - 1HMIB1-HoodHydrStn.MainPump1-HMIStop is closed, the hood hydraulic station circulation pump running normally open contact - B-HoodCirPump1-Running is closed, the hood hydraulic station main pump external interlocking condition normally open contact - B1_HoodHydrStn.MainPumpComInterLock is closed, the hood hydraulic station No. 1 oil pump running coil - B1_HoodHydrPump1_RunDO is energized and the main pump starts and operates normally.

[0014] Further, in S3, after the protection interlock of the signal for stopping the pump due to ultra-low liquid level, ultra-high oil temperature, or ultra-low pressure is set, the signal for setting the pump stop due to ultra-low liquid level, ultra-high oil temperature, or ultra-low pressure is compared and judged through a comparison logic module. When the comparison and judgment result meets the preset conditions, the corresponding counter is turned on and energized with a time delay. If, after a certain time delay of power-on, the comparison and judgment result still meets the preset conditions of the comparison logic module, the corresponding pump stop setting coil is energized. Specifically:

[0015] After the protection interlock of the signal for stopping the pump due to ultra-low liquid level is set, the 4-20 mA current comparison logic block of the liquid level gauge - B1_HydrTank_OilLv compares the actual current value A output by the liquid level gauge with the preset threshold current B. When A < B, the 4-20 mA current comparison logic block of the liquid level gauge outputs a trigger signal, causing the ultra-low liquid level counter of the hood hydraulic station - B1_HoodHydrStn.LvLoLo_Timer to be turned on and energized with a time delay. If, after a 5-second power-on time delay of the ultra-low liquid level counter of the hood hydraulic station, the comparison and judgment result still meets the preset conditions of the comparison logic module, that is, A < B, the normally open contact - B1_HoodHydrStn.LvLoLo_Timer.DN of the 5-second power-on time delay of the ultra-low liquid level counter of the hood hydraulic station closes, causing the ultra-low liquid level pump stop setting coil of the hood hydraulic station - B1_HoodHydrStn.LvLoLo_FaultStopPump to be energized;

[0016] After the protection interlock of the signal for stopping the pump due to ultra-high oil temperature is set, the ultra-high oil temperature comparison logic module - CNB_R8:6:I.Ch1Data compares the actual temperature C output by the oil temperature sensor with the preset threshold temperature D. When C > D, the ultra-high oil temperature comparison logic module outputs a trigger signal, causing the ultra-high oil temperature timer of the hood hydraulic station - B1_HoodHydrStn.TmpHiHi_Timer to be turned on and energized with a time delay. If, after a 5-second power-on time delay of the ultra-high oil temperature counter of the hood hydraulic station, the comparison and judgment result still meets the preset conditions of the comparison logic module, that is, C > D, the normally open contact - B1_HoodHydrStn.TmpHiHi_Timer.DN of the 5-second power-on time delay of the ultra-high oil temperature counter of the hood hydraulic station closes, causing the ultra-high oil temperature pump stop setting coil of the hood hydraulic station - B1_HoodHydrStn.TmpHiHi_FaultStopPump to be energized;

[0017] When the pressure is too low and the pump stop signal protection interlock is set, and the system pressure is too low - B1_HydrSys_PresLoLo is triggered, a trigger signal is output to make the hood hydraulic station pressure too low timer - B1_HoodHydrStn.PresLoLo_Timer open and delay to be energized. If the system pressure is still too low after the hood hydraulic station pressure too low counter is powered on and delayed for 10s, the hood hydraulic station pressure too low counter is powered on and delayed for 10s and the normally open contact - B1_HoodHydrStn.PresLoLo_Timer.DN is closed to make the hood hydraulic station pressure too low and the pump stop setting coil - B1_HoodHydrStn.PresLoLo_FaultStopPump energized.

[0018] Furthermore, in S4, when the main pump stops running, the control interlocking loop is cut off by closing a series of normally closed contacts of processed signals, specifically: when the main pump stops running, the normally closed contact of the signal after the hood hydraulic station liquid level is processed too low - B1_HoodHydrStn.LvLoLo_Calculated is closed, the normally closed contact of the signal after the hood hydraulic station oil temperature is processed too high - B1_HoodHydrStn.TmpHiHi_Calculated is closed, and the normally closed contact of the signal after the hood hydraulic station pressure is processed too low - B1_HoodHydrStn.PresLoLo_Calculated is closed, thereby energizing the external interlocking condition coil of the hood hydraulic station main pump - B1_HoodHydrStn.MainPumpComInterLock to cut off the control interlocking loop.

[0019] Furthermore, the preset threshold current is 20mA, the preset threshold temperature is 60°C, and the preset threshold voltage is 24V.

[0020] The beneficial effects of the present invention are:

[0021] First, the invention of this party participates in the interlocking protection control by adding pump stop setting signals such as ultra-low liquid level, ultra-high oil temperature, and ultra-low pressure. The hydraulic pump will be stopped in time when abnormal conditions that may cause damage occur. This greatly improves the operating safety of the equipment and reduces the risk of equipment damage caused by overload, overheating, etc.

[0022] Second, the present invention uses the human-machine interface HMI to allow operators to more intuitively and conveniently operate the hydraulic pump of the converter movable smoke hood hydraulic station. At the same time, through the closure of a series of normally open contacts and normally closed contacts, precise control of the operation of the main pump of the smoke hood hydraulic station can be achieved, thereby improving the flexibility and accuracy of the operation.

[0023] Third, in the present invention, when an abnormal signal is detected, the system will make a judgment through the comparison logic module, and automatically start the corresponding counter for delay when the preset conditions are met. If the temperature fails to drop to a safe range within the delay, the system will energize the corresponding pump stop setting coil to stop the operation of the main pump, thereby effectively protecting the normal operation and safety of the motor.

[0024] Fourthly, the present invention adopts an automatic control system to realize real-time monitoring and intelligent management of the operating status of the hydraulic pump, which not only improves management efficiency but also reduces the difficulty and error of manual operation.

[0025] Fifth, in the present invention, since the hydraulic pump is effectively protected, production interruptions due to equipment failures are reduced, thereby improving production efficiency.

[0026] Sixth, the present invention has certain scalability and flexibility, and can increase or decrease the protection interlocking signal according to actual needs to adapt to hydraulic pumps of different specifications and models. This flexibility enables the system to adapt to changing production needs and improves the adaptability and competitiveness of the system.

[0027] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below in conjunction with the accompanying drawings, wherein:

[0029] Figure 1 It is a flow chart of the present invention;

[0030] Figure 2 This is the operation logic diagram of the hood hydraulic station 1# oil pump;

[0031] Figure 3 This is the logic diagram of the protection interlock of the smoke hood hydraulic level ultra-low;

[0032] Figure 4 This is the interlock logic diagram for the protection of over-high temperature of the hood hydraulic oil;

[0033] Figure 5 This is the logic diagram of the protection interlock of the smoke hood hydraulic pressure being too low;

[0034] Figure 6 This is the external interlocking control diagram of the smoke hood hydraulic station. DETAILED DESCRIPTION

[0035] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0036] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present invention. In order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0037] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "front", "rear", etc. indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0038] See also Figure 1 to Figure 6 , is a specific embodiment of preventing abnormal damage to the hydraulic pump of the hydraulic station of the movable hood of the converter, which is used to further illustrate how to prevent abnormal damage to the hydraulic pump of the hydraulic station of the movable hood of the converter. The overall steps are as follows Figure 1 shown.

[0039] Step 1: System Configuration and Signal Addition

[0040] In the hydraulic station system of the converter movable smoke hood of a steel plant, the following three interlocking protection control signals are added on the basis of the existing electrical control system:

[0041] The pump stop signal when the liquid level of the hood hydraulic station is too low;

[0042] The oil temperature of the hood hydraulic station is too high and the pump stops setting signal;

[0043] The pump stop position signal of the smoke hood hydraulic station with extremely low pressure;

[0044] These signals will be integrated into the existing electrical control system.

[0045] Step 2: Human-machine operation and pump operation control, such as Figure 2 shown.

[0046] When the operator chooses to start the hydraulic pump of the converter movable hood hydraulic station on the HMI (human-machine interface), the following contacts will be closed in a logical order:

[0047] The centralized normally open contact of the No. 1 oil pump of the movable hood hydraulic station - B1-HydrPump1-Remote is closed;

[0048] Hood hydraulic station main pump 1HMI start normally open contact -B1-HoodHydrStn.MainPump1-HMIStart closed;

[0049] Hood hydraulic station main pump 1HMI stop normally closed contact-B1-HoodHydrStn.MainPump1-HMIStop closed;

[0050] Hood hydraulic station circulating pump running normally open contact - B-HoodCirPump1-Running closed;

[0051] Hood hydraulic station main pump external interlock condition normally open contact - B1_HoodHydrStn.MainPumpComInterLock closed;

[0052] When all the above conditions are met, the No. 1 oil pump running coil of the hood hydraulic station - B1_HoodHydrPump1_RunDO is energized, and the main pump starts and operates normally.

[0053] Step 3: Interlock protection and pump stop logic

[0054] When any signal of liquid level, oil temperature or pressure triggers the interlock protection, the corresponding comparison logic module will start working:

[0055] Ultra-low liquid level protection, such as Figure 3As shown: when the actual current value A output by the level meter is less than the preset threshold current B (for example, B=4mA, indicating 20% ​​of the liquid level), the level meter 4-20mA current comparison logic block outputs a trigger signal, so that the hood hydraulic station liquid level ultra-low counter - B1_HoodHydrStn.LvLoLo_Timer opens the delay to be energized, and the hood hydraulic station liquid level ultra-low counter starts a 5-second delay. If the liquid level is still ultra-low after 5 seconds, the hood hydraulic station liquid level ultra-low counter is energized and the normally open contact - B1_HoodHydrStn.LvLoLo_Timer.DN of the hood hydraulic station liquid level ultra-low counter is closed for a 5s delay, so that the hood hydraulic station liquid level ultra-low stop pump setting coil - B1_HoodHydrStn.LvLoLo_FaultStopPump is energized, and the main pump stops running.

[0056] Oil temperature over-temperature protection, such as Figure 4 As shown: when the actual temperature C output by the oil temperature sensor exceeds the preset threshold temperature D (for example, D = 60°C), the oil temperature over-high comparison logic module outputs a trigger signal, so that the hood hydraulic station oil temperature over-high timer - B1_HoodHydrStn.TmpHiHi_Timer opens the delay to be energized, and the hood hydraulic station oil temperature over-high counter starts a 5-second delay. If the oil temperature is still too high after 5 seconds, the hood hydraulic station oil temperature over-high counter is energized and delayed for 5s. The normally open contact - B1_HoodHydrStn.TmpHiHi_Timer.DN is closed, so that the hood hydraulic station oil temperature over-high stop pump setting coil - B1_HoodHydrStn.TmpHiHi_FaultStopPump is energized, and the main pump stops running.

[0057] Ultra-low pressure protection, such as Figure 5 As shown: when the system pressure is too low - B1_HydrSys_PresLoLo is triggered, a trigger signal is output to make the hood hydraulic station pressure too low timer - B1_HoodHydrStn.PresLoLo_Timer open and delay to be energized, and the hood hydraulic station pressure too low timer starts a 10-second delay. If the system pressure is still too low after 10 seconds, the hood hydraulic station pressure too low counter will be energized and delay for 10s. The normally open contact - B1_HoodHydrStn.PresLoLo_Timer.DN will be closed, so that the hood hydraulic station pressure too low stop pump setting coil - B1_HoodHydrStn.PresLoLo_FaultStopPump will be energized, and the main pump will stop running.

[0058] Step 4: Cut off the control chain loop

[0059] When the main pump stops running, the following normally closed contacts will close, such as Figure 6 As shown:

[0060] After the hood hydraulic station liquid level is processed to be extremely low, the signal normally closed contact - B1_HoodHydrStn.LvLoLo_Calculated is closed;

[0061] After the oil temperature of the hood hydraulic station is too high, the signal normally closed contact - B1_HoodHydrStn.TmpHiHi_Calculated is closed;

[0062] After the hood hydraulic station pressure is processed to be too low, the signal normally closed contact - B1_HoodHydrStn.PresLoLo_Calculated is closed;

[0063] The closing of these contacts causes the external interlocking condition coil of the main pump of the hood hydraulic station - B1_HoodHydrStn.MainPumpComInterLock to be energized, thereby cutting off the control interlocking loop and ensuring system safety.

[0064] Through the above embodiments, we can see that by adding interlocking protection control of the three key parameters of liquid level, oil temperature and pressure, and optimizing the human-machine operation interface and control logic, it is possible to effectively prevent abnormal damage to the hydraulic pump of the converter movable smoke hood hydraulic station, and improve the stability and safety of the system, thereby preventing the hydraulic pump of the converter movable smoke hood hydraulic station from being easily damaged due to reasons such as running, bubbling, dripping, and leakage of the hydraulic station, resulting in ultra-low liquid level, ultra-high oil temperature, and ultra-low pressure of the hydraulic station, thereby reducing the service life of the hydraulic pump, affecting the stable operation of the converter movable smoke hood lifting and lowering, and avoiding accidents that cause the movable smoke hood lifting system to lose control.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the present invention.

Claims

1. A method for preventing abnormal damage to a hydraulic pump of a hydraulic station of a converter movable hood, characterized in that: The method comprises the following steps: S1: In the existing converter movable hood hydraulic station hydraulic pump electrical control system, add the hood hydraulic station liquid level ultra-low pump stop setting signal, the hood hydraulic station oil temperature ultra-high pump stop setting signal and the hood hydraulic station pressure ultra-low pump stop setting signal to participate in the interlocking protection control; S2: When the operator operates the hydraulic pump of the converter movable fume hood hydraulic station on the human-machine operation screen HMI, the operation of the main pump of the fume hood hydraulic station is controlled by closing a series of normally open contacts and normally closed contacts; S3: When the protection interlock of the ultra-low liquid level stop pump signal, the ultra-high oil temperature stop pump signal, or the ultra-low pressure stop pump signal is set, the ultra-low liquid level stop pump setting signal, the ultra-high oil temperature stop pump setting signal, or the ultra-low pressure stop pump setting signal is compared and judged by the comparison logic module. When the comparison judgment result meets the preset conditions, the corresponding counter is turned on for delay and energized. If the comparison judgment result still meets the preset conditions of the comparison logic module after a certain period of power-on delay, the corresponding stop pump setting coil is energized, thereby stopping the operation of the main pump; S4: When the main pump stops running, the control interlocking loop is cut off by closing a series of normally closed contacts of processed signals to ensure system safety.

2. The method for preventing abnormal damage to the hydraulic pump of the hydraulic station of the movable hood of the converter according to claim 1 is characterized in that: In S2, when the operator operates the hydraulic pump of the converter movable hood hydraulic station on the human-machine operation screen HMI, the operation of the main pump of the hood hydraulic station is controlled by closing a series of normally open contacts and normally closed contacts, specifically: When the operator operates the hydraulic pump of the converter movable hood hydraulic station on the human-machine operation screen HMI, the centralized normally open contact of the movable hood hydraulic station No. 1 oil pump - B1-HydrPump1-Remote is closed, the hood hydraulic station main pump 1 HMI start normally open contact - B1-HoodHydrStn.MainPump1-HMIStart is closed, the hood hydraulic station main pump 1 HMI stop normally closed contact - 1HMIB1-HoodHydrStn.MainPump1-HMIStop is closed, the hood hydraulic station circulation pump running normally open contact - B-HoodCirPump1-Running is closed, the hood hydraulic station main pump external interlocking condition normally open contact - B1_HoodHydrStn.MainPumpComInterLock is closed, the hood hydraulic station No. 1 oil pump running coil - B1_HoodHydrPump1_RunDO is energized and the main pump starts and operates normally.

3. The method for preventing abnormal damage to the hydraulic pump of the hydraulic station of the movable hood of the converter according to claim 1 is characterized in that: In S3, when the protection interlock of the liquid level ultra-low pump stop signal, the oil temperature ultra-high pump stop signal, or the pressure ultra-low pump stop signal is set, the liquid level ultra-low pump stop signal, the oil temperature ultra-high pump stop signal, or the pressure ultra-low pump stop signal is compared and judged by the comparison logic module. When the comparison judgment result meets the preset conditions, the corresponding counter is turned on for a delay and energized. If the comparison judgment result still meets the preset conditions of the comparison logic module after a certain period of power-on delay, the corresponding pump stop setting coil is energized, specifically: When the protection interlock of the signal for stopping the pump due to ultra-low liquid level is set, the 4-20 mA current comparison logic block of the liquid level gauge - B1_HydrTank_OilLv compares the actual current value A output by the liquid level gauge with the preset threshold current B. When A < B, the 4-20 mA current comparison logic block of the liquid level gauge outputs a trigger signal, causing the ultra-low liquid level counter of the hood hydraulic station - B1_HoodHydrStn.LvLoLo_Timer to be energized with a delayed opening. If, after a 5-second power-on delay of the ultra-low liquid level counter of the hood hydraulic station, the comparison and judgment result still meets the preset condition of the comparison logic module, that is, A < B, then the normally open contact - B1_HoodHydrStn.LvLoLo_Timer.DN of the 5-second power-on delay of the ultra-low liquid level counter of the hood hydraulic station closes, causing the ultra-low liquid level stop pump setting coil of the hood hydraulic station - B1_HoodHydrStn.LvLoLo_FaultStopPump to be energized; When the protection interlock of the signal for stopping the pump due to ultra-high oil temperature is set, the ultra-high oil temperature comparison logic module - CNB_R8:6:I.Ch1Data compares the actual temperature C output by the oil temperature sensor with the preset threshold temperature D. When C > D, the ultra-high oil temperature comparison logic module outputs a trigger signal, causing the ultra-high oil temperature timer of the hood hydraulic station - B1_HoodHydrStn.TmpHiHi_Timer to be energized with a delayed opening. If, after a 5-second power-on delay of the ultra-high oil temperature counter of the hood hydraulic station, the comparison and judgment result still meets the preset condition of the comparison logic module, that is, C > D, then the normally open contact - B1_HoodHydrStn.TmpHiHi_Timer.DN of the 5-second power-on delay of the ultra-high oil temperature counter of the hood hydraulic station closes, causing the ultra-high oil temperature stop pump setting coil of the hood hydraulic station - B1_HoodHydrStn.TmpHiHi_FaultStopPump to be energized; When the protection interlock of the signal for stopping the pump due to ultra-low pressure is set and the ultra-low system pressure - B1_HydrSys_PresLoLo is triggered, a trigger signal is output, causing the ultra-low pressure timer of the hood hydraulic station - B1_HoodHydrStn.PresLoLo_Timer to be energized with a delayed opening. If, after a 10-second power-on delay of the ultra-low pressure counter of the hood hydraulic station, the system pressure is still ultra-low, then the normally open contact - B1_HoodHydrStn.PresLoLo_Timer.DN of the 10-second power-on delay of the ultra-low pressure counter of the hood hydraulic station closes, causing the ultra-low pressure stop pump setting coil of the hood hydraulic station - B1_HoodHydrStn.PresLoLo_FaultStopPump to be energized.

4. The method for preventing abnormal damage to the hydraulic pump of the hydraulic station of the movable hood of the converter according to claim 1 is characterized in that: In S4, when the main pump stops running, the control interlocking loop is cut off by closing a series of normally closed contacts of processed signals, specifically: when the main pump stops running, the normally closed contact of the signal after the hood hydraulic station liquid level is processed too low - B1_HoodHydrStn.LvLoLo_Calculated is closed, the normally closed contact of the signal after the hood hydraulic station oil temperature is processed too high - B1_HoodHydrStn.TmpHiHi_Calculated is closed, and the normally closed contact of the signal after the hood hydraulic station pressure is processed too low - B1_HoodHydrStn.PresLoLo_Calculated is closed, thereby energizing the external interlocking condition coil of the hood hydraulic station main pump - B1_HoodHydrStn.MainPumpComInterLock to cut off the control interlocking loop.

5. The method for preventing abnormal damage to the hydraulic pump of the hydraulic station of the movable hood of the converter according to claim 3 is characterized in that: The preset threshold current is 20mA, the preset threshold temperature is 60°C, and the preset threshold voltage is 24V.

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