Multi-stage full-automatic stirrer control system and method

Abstract

The invention discloses a multi-stage full-automatic stirrer control system and method. The multi-stage full-automatic stirrer control system comprises a signal input layer module and a signal output layer module which are connected with a central control PLC (Programmable Logic Controller), the signal input layer module comprises a control cabinet scram signal module, a field scram signal module, a field state signal module, a mixer motor A state signal module, a mixer motor B state signal module, a hydraulic station lubricating pump state signal module, a feeding door state signal module, a discharging door state signal module and a material door opening degree signal module. A water inlet and outlet pressure signal module; a radar material level signal module; the signal output layer module comprises a control cabinet indicator light display control module, a hydraulic station lubricating pump control module, a stirrer motor A control module, a stirrer motor B control module, a discharge door control module, a water valve A / B control module, a flushing water valve control module and an air valve control module.

Description

Technical Field

[0001] The present invention belongs to the technical field of automatic control, and particularly relates to a multi-stage full-automatic mixer control system and method. Background Art

[0002] Traditional mixers face problems such as low automation level, incomplete cleaning, high energy consumption, and high failure rate in the filling field. Existing technologies rely on fixed timing control, unable to dynamically adjust parameters such as the opening degree of the discharge door and lubrication cycle. Cleaning only through single water flushing results in residues, continuous operation of the lubrication pump increases energy consumption, and there is a lack of real-time status monitoring and safety protection mechanisms. Summary of the Invention

[0003] The present invention aims to overcome the deficiencies of the prior art and provides a multi-stage full-automatic mixer control system and method.

[0004] To achieve the above object, the technical solution provided by the present invention is as follows: The multi-stage full-automatic mixer control system includes a signal input layer module and a signal output layer module connected to the central control PLC (14); the signal input layer module includes a control cabinet emergency stop signal module (1), a field emergency stop signal module (2), a field status signal module (3), a mixer motor A status signal module (4), a mixer motor B status signal module (5), a hydraulic station lubrication pump status signal module (6), a feeding door status signal module (7), a discharge door status signal module (8), a door opening degree signal module (9), an inlet and outlet water pressure signal module (10), a radar level signal module (11); the signal output layer module includes a control cabinet indicator light display control module (16), a hydraulic station lubrication pump control module (17), a mixer motor A control module (18), a mixer motor B control module (19), a discharge door control module (20), a water valve A / B control module (21), a flushing water valve control module (22), an air valve control module (23); the multi-stage full-automatic mixer control system further includes a switching power supply (12), an HMI (13), and a host computer (15) connected to the central control PLC (14); the signal input layer module feeds back the signals collected in real time to the central control PLC (14), the central control PLC (14) processes the received information and feeds it back to the host computer (15), and the host computer (15) outputs the control signals through the central control PLC (14) to the signal output layer module to control the corresponding components.

[0005] Preferably, the switching power supply (12) is connected to the HMI (13).

[0006] The control method based on the above multi-stage full-automatic mixer control system includes a startup stage, an operation stage, a cleaning stage, and a shutdown stage; The startup phase includes: 1) System initialization; 2) System self-check; 3) If the self-check passes, start the lubrication pump of the hydraulic station; 4) After starting the mixer motor and opening the water valves A / B for flushing, enter the operation phase; The operation phase includes: 1) Feed the material and perform material level detection to determine whether the material level reaches the preset value. If it reaches the preset value, open the discharge door; 2) Control the lubrication pump of the hydraulic station to operate in an intermittent mode, and control the flushing water valve and air valve to open intermittently according to the material level; 3) Enter the cleaning phase; The cleaning phase includes: 1) Open the flushing water valve after stopping the feeding; 2) Close the discharge door after discharging all the slurry; 3) Open the water valves A / B for flushing after filling with water; 4) After stopping the flushing of the water valves A / B, open the air valve for purging; 5) After stopping the purging of the air valve, start stirring. After stopping the stirring, enter the shutdown phase; The shutdown phase includes: 1) Close the water valves A / B; 2) Open the discharge door for draining; 3) Turn off the mixer motor; 4) Close the discharge door; 5) Keep the lubrication pump of the hydraulic station running for a period of time and then turn off the power supply of the whole machine.

[0007] Preferably, in the control method, the way to control the discharge door is to dynamically adjust the opening of the discharge door through the following non-linear mapping formula: Discharge door opening = α[(target material level - current material level) / maximum deviation]^β + γ; Where α is the proportionality coefficient, with a value of 0.3 - 0.7; β is the non-linear correction factor, with a value of 0.5 - 1.5; γ is the basic opening, with a value of 5% - 15%.

[0008] Preferably, the intermittent opening control of the flushing water valve and the air valve in the control method is realized according to the following formula: Flushing cycle = target flushing volume / (water valve flow + air valve flow)×efficiency correction factor; Air valve delay = flushing cycle×air valve lag time coefficient; Where the target flushing volume is set according to the tank volume and material characteristics, the water valve flow is determined by the valve opening and water pressure and is closed-loop controlled through the Bernoulli equation, the air valve flow ensures that the purging pressure > 0.6 MPa and the pipe diameter matches, the efficiency correction factor is 0.8 - 1.2, and the air valve lag time coefficient is 0.3 - 0.5.

[0009] The efficiency correction factor is represented by η. The adjustment of η is mainly based on empirical rules and is dynamically optimized within the range of 0.8 - 1.2 in combination with on-site measured data. Specifically as follows: 1. Influence of water quality, hard water (high calcium and magnesium ion content): Scaling is likely to occur in the pipeline, resulting in flow attenuation. η takes 0.8 - 0.9 (10% - 20% lower than soft water); Soft water or pure water: η takes 1.0 - 1.2 (default value).

[0010] 2. Influence of pipeline length: Taking a 10m pipeline as the benchmark, for every additional 10m, η decreases by 5% (e.g., for a 20m pipeline → η = 0.95, for a 30m pipeline → η = 0.9); for short pipelines (<10m) or directly connected pipelines, η takes a value of 1.0 - 1.1.

[0011] 3. Influence of water temperature: Taking 20°C as the benchmark, for every 5°C decrease in water temperature, the liquid viscosity increases, the flow rate decays, and η decreases by 2% (e.g., for 15°C → η = 0.98, for 10°C → η = 0.96); when the water temperature rises (>20°C), η can be slightly increased (up to 1.05 at most), but the risk of cavitation needs to be avoided.

[0012] The following further describes the present invention: The multi-stage full-automatic mixer control system described in the present invention adopts a hierarchical hardware architecture design, which is divided into an input layer, a control layer, and an output layer.

[0013] Input layer: Design with multiple emergency stops in redundancy (emergency stop in the control cabinet + on-site emergency stop) to ensure operation safety; full equipment status feedback (motor operation / fault, valve opening, level / pressure analog quantity, etc.) to support real-time data acquisition.

[0014] Control layer: Based on the central processor of the PLC, realize logical operation and equipment action control; support dual interaction between HMI (human-machine interface) and the upper computer, and be compatible with local operation and remote monitoring.

[0015] Output layer: Modular control signal output (motor start / stop, valve opening adjustment, air / water valve action, etc.); the indicator lights in the control cabinet display the equipment status in real time, facilitating quick troubleshooting.

[0016] The core of the multi-stage full-automatic mixer control method described in the present invention lies in: Automated sequential control The entire process is automatically executed through preset time sequences and logical sequences, including four major stages: start → operation → cleaning → shutdown, and each step is triggered in sequence. These flowcharts clearly show the four stages of the mixer control process, and the key steps and judgment logics of each stage are clear at a glance. After the start-up stage completes system initialization and self-checking, it enters the operation stage; in the operation stage, the discharge door is controlled according to the level situation and stable operation is maintained, and then it enters the cleaning stage; after the cleaning stage completes a series of cleaning operations, it enters the shutdown stage; in the shutdown stage, the equipment is gradually shut down, and finally the entire process ends.

[0017] Interlocking protection mechanism Interlock between level and discharge door: The opening of the discharge door is interlocked with the real-time data of the radar level gauge to maintain a stable level.

[0018] Status Detection: System self-check (confirmation of the initial position of the equipment) must be completed before startup, otherwise startup is prohibited.

[0019] Linkage between Cleaning and Shutdown: After the cleaning process is completed, the equipment shuts down in sequence to prevent residual materials from clogging.

[0020] Phased Timing Control Startup Phase: The lubrication pump runs preferentially for 2 min → the mixer motor starts → the flushing water valve flushes for 5 min.

[0021] Operation Phase: The lubrication pump switches to intermittent mode (8 min working / 12 min stop); the flushing water valve and air valve open intermittently according to the material level (water for 2 min / air for 1 min).

[0022] Cleaning Phase: Fill water to 70% level → flush for 10 min → air valve purge for 5 min → continue stirring for 10 - 20 min.

[0023] Shutdown Phase: The lubrication pump is delayed in closing (10 min) to ensure sufficient lubrication of the equipment.

[0024] Synergy of Dual-Power System The mixer motors A and B drive synchronously, the hydraulic station controls the action of the discharge door, and the air valve and water valve cooperate to complete cleaning.

[0025] Energy-Saving Design Discontinuous running equipment (such as lubrication pumps and water valves) adopts intermittent working system to reduce energy consumption.

[0026] Key Control Logic Startup Conditions: The maintenance door is closed → the level gauge is on → all components are powered on → self-check passes.

[0027] Safe Shutdown: Stop feeding first → drain all the slurry → close the discharge door → inject water for cleaning → shut down step by step.

[0028] Cleaning Logic: Flush → Purge → Stir → Drain to ensure no residue.

[0029] Control Mode Manual / Automatic Switching: Supports operation through HMI, host computer or on-site control cabinet, and real-time displays the equipment status (such as indicator lights).

[0030] Fault Feedback: Unreset equipment or abnormal status alarms through indicator lights.

[0031] Fuzzy Control Algorithm for the Opening Degree of the Discharge Door Dynamically adjust the opening degree of the discharge door through a non - linear mapping formula. The core formula is: discharge door opening degree = α[(target material level - current material level) / maximum deviation]^β + γ. Here, α is the proportionality coefficient (0.3 - 0.7), which controls the influence weight of the material level deviation on the opening degree. A higher value is taken for viscous materials to accelerate the response; β is the non - linear correction factor (0.5 - 1.5). When β>1, the response to small deviations is enhanced, which is applicable to easily blocked materials; γ is the basic opening degree (5% - 15%), which prevents the valve from closing completely. The algorithm adjusts α to balance the response speed and stability, utilizes the non - linear characteristics of β to optimize the control sensitivity in different deviation ranges, and γ ensures the safe operation of the equipment. In practical applications, parameters need to be matched according to the material characteristics: increase β and γ for high - viscosity materials, and decrease α and β for materials with good fluidity. Parameter tuning needs to be combined with on - site commissioning. First, fix β = 1 and γ = 5% and adjust α, then fine - tune β and γ according to the material characteristics, and finally establish a parameter library for typical working conditions. For example, when the target material level is 500L and the current is 480L, a combination of α = 0.5, β = 1.2, and γ = 5% can calculate an opening degree of 12.5%. This algorithm significantly improves the response ability of the discharge door to material level changes, taking into account both control accuracy and equipment safety.

[0032] 9. Co - washing algorithm for air valve and water valve Achieve efficient cleaning through flow superposition and timing optimization. The core formula is: flushing cycle = target flushing volume / (water valve flow + air valve flow)×efficiency correction factor, and air valve delay = flushing cycle × air valve lag time coefficient. Here, the target flushing volume is set according to the tank volume and material characteristics (for example, 20% increase for viscous materials). The water valve flow is determined by the valve opening degree and water pressure and is closed - loop controlled through the Bernoulli equation. The air valve flow needs to ensure that the purging pressure > 0.6MPa and the pipe diameter matches. The efficiency correction factor is affected by water quality, pipe length, and water temperature (take 0.8 for hard water, and the coefficient decreases by 5% for every 10m increase in pipe length). The air valve lag time coefficient is usually 0.3 - 0.5 to ensure purging after water flushing. When implementing the algorithm, a three - stage strategy is adopted: pre - flushing with full opening for 30 seconds to soften residues, main flushing with coordinated air and water according to the calculated cycle, and fine - flushing with only the air valve purging for 10 seconds. The total flow is monitored in real - time through a flow sensor and an alarm is given when it is less than 90%. The pressure sensor extends the purging when the air valve pressure < 0.5MPa. Optimize parameters for different materials (such as 150L target flushing volume for concrete, correction coefficient of 0.9 for chemical slurry), and at the same time set an energy - saving mode and a fault - handling mechanism (switch to a standby valve when the water valve is blocked, close the drain when the air valve leaks). In terms of maintenance, the flow and sealing performance need to be calibrated monthly, parameters optimized quarterly, and nozzles cleaned to ensure the long - term stable operation of the algorithm.

[0033] Compared with the prior art, the present invention has the following beneficial effects: 1. Multi-stage timing control and interlocking protection: adopting fully automatic control process, through preset timing and logical interlocking to achieve full process without human intervention, including: ①The material level meter and the opening of the discharge door are linked in real time to dynamically maintain the material level stability; ② The cleaning process must be performed after discharge to avoid material residue; ③ Lubrication pump delayed shut-off mechanism (lubrication continues for 10 minutes after operation ends).

[0034] 2. Energy-saving intermittent lubrication: Adopt the intermittent lubrication mode of "8 minutes working + 12 minutes stopping" cycle to replace the traditional continuous lubrication. Dynamically adjust the lubrication cycle based on the equipment operation status (such as mixer speed, load); combined with the timing optimization of pre-lubrication for 2 minutes before the lubrication pump starts.

[0035] 3. Air and water coordinated cleaning: Adopt the "water flushing → air purge → circulation stirring" combined cleaning strategy to solve the residual problem of traditional single flushing method, including: ① The water valve (2 min) and the air valve (1 min) are opened alternately to improve cleaning efficiency; ② Precise control of cleaning liquid level (fill water to 70% of tank height); ③ After cleaning, extend the stirring time (10-20 min) to enhance the mixing effect.

[0036] 4. Develop a self-check mechanism for the entire equipment status before startup and a graded alarm mechanism for abnormal status: when a fault occurs, the “emptying → cleaning → safe shutdown” emergency process is automatically triggered.

[0037] 5. Modular configuration system for user-defined cleaning parameters (such as flushing time and water injection volume).

[0038] In summary, the present invention realizes unmanned intervention in the whole process through a multi-stage fully automatic control architecture, breaks through the traditional mode, and creates a four-stage timing control for the first time. It maintains stability through real-time interlocking of the level meter and the discharge door; adopts the "water flushing (2min) → air purge (1min) → circulation stirring (10-20min)" combined cleaning technology, combined with 70% liquid level precision control to improve cleaning efficiency; innovates the lubrication pump intermittent mode (8min working / 12min shutdown) and dual motor synchronous drive collaborative control to reduce energy consumption by 15%-20%; through multi-sensor data fusion diagnosis and fault emergency process, fault prediction and safe shutdown are realized. The present invention is suitable for scenes such as concrete mixing stations and filling systems. It is expected to reduce labor costs by 30% and cleaning water consumption by 40%, promote the intelligent and green upgrading of the industry, and provide a new model for technological innovation of industrial mixing equipment. Brief Description of the Drawings

[0039] Figure 1 : Schematic structural diagram of the multi-stage full-automatic mixer control system of the present invention; Figure 2 : Logic control diagram in the startup stage; Figure 3 : Logic control diagram in the running stage; Figure 4 : Logic control diagram in the cleaning stage; Figure 5 : Logic control diagram in the shutdown stage.

[0040] In the figure: 1. Emergency stop signal module of the control cabinet; 2. Emergency stop signal module on-site; 3. On-site status signal module; 4. Status signal module of mixer motor A; 5. Status signal module of mixer motor B; 6. Status signal module of the lubricating pump of the hydraulic station; 7. Status signal module of the feeding door; 8. Status signal module of the discharging door; 9. Signal module of the opening degree of the material door; 10. Inlet and outlet water pressure signal module; 11. Radar level signal module; 12. Switching power supply; 13. HMI; 14. Central control PLC; 15. Host computer; 16. Control module for indicating lamp display of the control cabinet; 17. Control module of the lubricating pump of the hydraulic station; 18. Control module of mixer motor A; 19. Control module of mixer motor B; 20. Control module of the discharging door; 21. Control module of water valves A / B; 22. Control module of the flushing water valve; 23. Control module of the air valve. Detailed Embodiment

[0041] The present invention will be further described below in conjunction with the drawings and embodiments. Embodiment 1

[0042] See Figure 1, the multi-stage full-automatic mixer control system includes a signal input layer module and a signal output layer module connected to the central control PLC 14; the signal input layer module includes a control cabinet emergency stop signal module 1, a field emergency stop signal module 2, a field status signal module 3, a mixer motor A status signal module 4, a mixer motor B status signal module 5, a hydraulic station lubricating pump status signal module 6, a feeding door status signal module 7, a discharging door status signal module 8, a door opening signal module 9, an inlet and outlet water pressure signal module 10, and a radar level signal module 11; the signal output layer module includes a control cabinet indicator light display control module 16, a hydraulic station lubricating pump control module 17, a mixer motor A control module 18, a mixer motor B control module 19, a discharging door control module 20, a water valve A / B control module 21, a flushing water valve control module 22, and an air valve control module 23; the multi-stage full-automatic mixer control system further includes a switching power supply 12, an HMI 13, and a host computer 15 connected to the central control PLC 14; the signal input layer module feeds back the signals collected in real time to the central control PLC 14, the central control PLC 14 processes the received information and feeds it back to the host computer 15, and the host computer 15 outputs the control signals to the signal output layer module through the central control PLC 14 to control the corresponding components.

[0043] Among them, the switching power supply 12 is connected to the HMI 13. Embodiment 2

[0044] See Figures 2 to 5 , the control method based on the multi-stage full-automatic mixer control system described in Embodiment 1 includes a startup stage, a running stage, a cleaning stage, and a shutdown stage; The startup stage includes: 1) System initialization; 2) System self-check; 3) If the self-check passes, start the hydraulic station lubricating pump to run for 2 minutes; 4) After starting the mixer motor and opening the water valve A / B to flush for 5 minutes, enter the running stage; The running stage includes: 1) Feed and perform level detection, determine whether the level reaches the preset value, and if it reaches the preset value, open the discharging door; 2) Control the hydraulic station lubricating pump to run in an intermittent mode of running for 8 minutes and stopping for 12 minutes, and control the flushing water valve and the air valve to intermittently open according to the level in the mode of opening the flushing water valve for 2 minutes and opening the air valve for 12 minutes; 3) Enter the cleaning stage; The cleaning stage includes: 1) Open the flushing water valve after stopping feeding; 2) Close the discharging door after draining all the slurry; 3) Inject water to 70% and then open the water valve A / B to flush for 10 minutes; 4) After stopping the water valve A / B flushing, open the air valve to purge for 5 minutes; 5) After stopping the air valve purge, start stirring for 10 - 20 minutes, and enter the shutdown stage after stopping stirring; The shutdown phase includes: 1) closing water valves A / B; 2) opening the discharge door for drainage; 3) turning off the mixer motor; 4) closing the discharge door; 5) keeping the lubrication pump of the hydraulic station running for another 10 minutes and then turning off the power supply of the whole machine.

[0045] In the control method, the way to control the discharge door is to dynamically adjust the opening of the discharge door through the following non-linear mapping formula: Opening of the discharge door = α[(target material level - current material level) / maximum deviation]^β + γ; Where, α is the proportionality coefficient, with a value of 0.3 - 0.7; β is the non-linear correction factor, with a value of 0.5 - 1.5; γ is the basic opening, with a value of 5% - 15%.

[0046] In the control method, the intermittent opening control of the flushing water valve and the air valve is achieved according to the following formula: Flushing cycle = target flushing volume / (water valve flow + air valve flow) × efficiency correction factor; Air valve delay = flushing cycle × air valve lag time coefficient; Where, the target flushing volume is set according to the tank volume and material characteristics, the water valve flow is determined by the valve opening and water pressure and is closed-loop controlled through the Bernoulli equation, the air valve flow ensures that the purging pressure > 0.6 MPa and the pipe diameter matches, the efficiency correction factor, and the air valve lag time coefficient is 0.3 - 0.5.

[0047] The efficiency correction factor is represented by η. The adjustment of η is mainly based on empirical rules and is dynamically optimized within the range of 0.8 - 1.2 in combination with on-site measured data. Specifically as follows: 1. Influence of water quality, hard water (high calcium and magnesium ion content): Scaling is likely to occur in the pipeline, resulting in flow attenuation, and η takes 0.8 - 0.9 (10% - 20% lower than soft water); soft water or pure water: η takes 1.0 - 1.2 (default value).

[0048] 2. Influence of pipeline length, with a 10m pipeline as the benchmark, for every additional 10m, η decreases by 5% (e.g., for a 20m pipeline → η = 0.95, for a 30m pipeline → η = 0.9); for short pipelines (<10m) or directly connected pipelines, η takes 1.0 - 1.1.

[0049] 3. Influence of water temperature, with 20℃ as the benchmark, for every 5℃ decrease in water temperature, the liquid viscosity increases and the flow rate attenuates, and η decreases by 2% (e.g., for 15℃ → η = 0.98, for 10℃ → η = 0.96); when the water temperature rises (>20℃), η can be slightly increased (up to 1.05 at most), but the risk of cavitation needs to be avoided.

Claims

1. A multi-stage fully automatic mixer control system, characterized in that: The multi-stage fully automatic mixer control system comprises a signal input layer module and a signal output layer module connected to a central control PLC (14); the signal input layer module comprises a control cabinet emergency stop signal module (1), an on-site emergency stop signal module (2), an on-site status signal module (3), a mixer motor A status signal module (4), a mixer motor B status signal module (5), a hydraulic station lubrication pump status signal module (6), a loading door status signal module (7), a discharge door status signal module (8), a material door opening signal module (9), an inlet and outlet water pressure signal module (10), and a radar material level signal module (11); the signal output layer module comprises a control cabinet indicator light display control module (16), a hydraulic station lubrication pump control module (17), a hydraulic station lubrication pump control module (18), a hydraulic station lubrication pump control module (19), a hydraulic station lubrication pump control module (21), a hydraulic station lubrication pump control module (22), a hydraulic station lubrication pump control module (23), a hydraulic station lubrication pump control module (24), a hydraulic station lubrication pump control module (25), a hydraulic station lubrication pump control module (26), a hydraulic station lubrication pump control module (27), a hydraulic station lubrication pump control module (28), a hydraulic station lubrication pump control module (29), a hydraulic station lubrication pump control module (3 ... A control module (17), a mixer motor A control module (18), a mixer motor B control module (19), a discharge door control module (20), a water valve A / B control module (21), a flushing water valve control module (22), and an air valve control module (23); the multi-stage fully automatic mixer control system also includes a switching power supply (12), an HMI (13), and a host computer (15) connected to the central control PLC (14); the signal input layer module feeds back the real-time collected signal to the central control PLC (14), the central control PLC (14) processes the received information and feeds it back to the host computer (15), and the host computer (15) outputs the control signal to the signal output layer module through the central control PLC (14) to control the corresponding components.

2. The multi-stage fully automatic mixer control system according to claim 1, characterized in that: The switching power supply (12) is connected to the HMI (13).

3. The control method of the multi-stage fully automatic mixer control system according to claim 1 or 2, characterized in that: The method comprises a startup phase, an operation phase, a cleaning phase and a shutdown phase; The startup phase includes: 1) system initialization; 2) system self-test; 3) if the self-test passes, the lubrication pump of the hydraulic station is started; 4) after starting the mixer motor and opening the water valve A / B for flushing, the operation phase is entered; The operation stage includes: 1) feeding and performing material level detection to determine whether the material level reaches a preset value, and if so, opening the unloading door; 2) controlling the lubrication pump of the hydraulic station to operate in an intermittent mode, and controlling the flushing water valve and the air valve to be opened intermittently according to the material level; 3) entering the cleaning stage; The cleaning stage includes: 1) opening the flushing water valve after stopping feeding; 2) closing the discharge door after draining the slurry; 3) opening the water valve A / B for flushing after filling water; 4) opening the air valve for purging after stopping the water valve A / B for flushing; 5) starting stirring after stopping the air valve for purging, and entering the shutdown stage after stopping stirring; The shutdown stage includes: 1) closing the water valve A / B; 2) opening the discharge door to drain water; 3) shutting down the mixer motor; 4) closing the discharge door; 5) keeping the lubrication pump of the hydraulic station running for a period of time and then shutting down the power supply of the whole machine.

4. The control method of the multi-stage fully automatic mixer control system as claimed in claim 3, characterized in that: The method of controlling the discharge door in the control method is to dynamically adjust the discharge door opening by the following nonlinear mapping formula: Discharge door opening = α[(target material level - current material level) / maximum deviation]^β+γ; Among them, α is the proportional coefficient, the value is 0.3-0.7; β is the nonlinear correction factor, the value is 0.5-1.5; γ is the basic opening, the value is 5%-15%.

5. The control method of the multi-stage fully automatic mixer control system as claimed in claim 3, characterized in that: The intermittent opening control of the flushing water valve and the air valve in the control method is implemented according to the following formula: Flushing cycle = target flushing volume / (water valve flow + air valve flow) × efficiency correction factor; Air valve delay = flushing cycle × air valve lag time coefficient; Among them, the target flushing volume is set according to the tank volume and material characteristics, the water valve flow is determined by the valve opening and water pressure and is closed-loop controlled by the Bernoulli equation, the air valve flow ensures that the purge pressure is > 0.6MPa and the pipe diameter is matched, the efficiency correction coefficient is 0.8-1.2, and the air valve lag time coefficient is 0.3-0.5.

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