32 results about "Cascade control system" patented technology

The invention discloses a pinch roll gap cascade control system with an automatic calibration function. The pinch roll gap cascade control system comprises a hydraulic module, a detection module and an upper computer, the hydraulic modules are arranged on the two sides of the pinch roll device. The detection module is arranged on the hydraulic module; the upper computer is connected with the hydraulic module and the detection module. The invention further discloses a pinch roll gap cascade control method with the automatic calibration function. The invention provides a control system which is good in pinch roll gap adjusting effect and considers automatic calibration in the high-precision steel plate production process.

The invention discloses a system and a method for hydrogen production by cascade regulation and control of wastewater, and belongs to the field of electrochemistry, the system comprises a self-driven separator, a wastewater liquid inlet, a self-capture unit, a self-driven liquid upper layer, a self-driven liquid lower layer, an electrolytic bath and a component detector. By utilizing the self-driven liquid and cascade regulation, organic matters in the wastewater are subjected to phase splitting to the upper layer of the self-driven liquid, inorganic matters in the wastewater are subjected to phase splitting to the lower layer, and water molecules in the lower layer solution are migrated to an electrolyte in the self-capture unit, so that the organic matters and the inorganic matters in the wastewater can be completely isolated outside and are prevented from influencing the electrolyte; therefore, high-purity hydrogen can be obtained, and no corrosion or toxicity is caused to an electrolysis system.

A cascaded control system for coordinating and controlling carbon emissions associated with operating building equipment distributed across a plurality of subsystems includes a first controller configured to generate carbon emissions targets for each of a plurality of subsystems using a predictive control process that accounts for an aggregate carbon emissions of the plurality of subsystems predicted to result from the carbon emissions targets. The cascaded control system also includes a plurality of second controllers, each corresponding to one of the plurality of subsystems and configured to generate control decisions for building equipment of the corresponding subsystem that are predicted to cause the building equipment to achieve the carbon emissions targets for the corresponding subsystem; and operate the building equipment of the corresponding subsystem using the control decisions.

The utility model relates to LED lighting technical field discloses a layered controllable LED lamps and lanterns and cascade control system. The lamps and lanterns include casing and circuit board, and the circuit board integrates drive module, LED lamp set and power module. Drive module is connected with the distribution address code through single line communication bus series connection multiple LED drive chip, and the first chip is connected with external code writer and is distributed address code, and LED lamp set is equipped with multiple sections of addressable light emitting circuit, and each circuit contains RGB LED unit and is independently controlled current control. The power module guarantees power supply stability through filter unit. The casing is equipped with detachable assembly structure and limiting clamping groove. In the cascade control system, each lamps and lanterns is connected through chip pin and forms cascade link. The utility model realizes layered independent control, reliable signal transmission and accurate current drive, supports dynamic light effect, modular extension, solves the problems of insufficient control flexibility of traditional lamps and lanterns, poor signal transmission reliability and the like, and is suitable for advertisement decoration, stage lighting and the like scenes.

The invention relates to a method for operating an internal combustion engine of a motor vehicle, in which a cascade control system is used. In this system, a first quantity of air, the first quantity of which is introduced into a combustion chamber of the internal combustion engine, and a second quantity of fuel, the second quantity of which is introduced into the combustion chamber of the internal combustion engine, are controlled by means of two controllers (4, 5) of two nested control loops (2, 3). For a first controller (4, 5), a first correction value is determined, which characterizes a first control deviation (RA1) that is applied to the first controller (4). For a second controller (4, 5), a second correction value is determined, which characterizes a second control deviation (RA2) that is applied to the second controller (5).From the correction values ​​of the controllers (4, 5), a common adaptation value is determined, which is stored in a storage network common to the controllers.

This invention discloses an automated monitoring and detection cascade control system for bioaerosols, comprising a cascaded monitoring and detection unit and an automatic control unit. The cascaded monitoring and detection unit includes: a first-level monitoring module, a bioaerosol monitor based on laser-induced fluorescence technology (aerosol fluorescent particle monitor); a second-level monitoring module, a bioaerosol live-cell monitor based on ATP fluorescence detection technology (aerosol live-cell ATP monitor); and a third-level detection module, a bioaerosol nucleic acid detector based on microfluidic PCR technology (an integrated bioaerosol detection and nucleic acid detection system). The automatic control unit uses high and low level switching signals to achieve sequential instantaneous triggering of the three levels of equipment, completing automated hierarchical monitoring and early warning of "broad-spectrum monitoring → biological confirmation → specific detection". This invention solves the problem in existing bioaerosol monitoring technologies that cannot simultaneously achieve broad-spectrum, real-time, accurate, and automated monitoring.

The embodiment of the invention relates to the technical field of minimally invasive surgery robots, and discloses a cascade control system and method and a minimally invasive surgery robot. The system comprises a controller and a driver, wherein the controller comprises a speed planning module and a control module; the control module comprises a position ring and a speed ring; the driver comprises a current loop; the speed planning module is used for determining a planning position and a planning speed; the position ring is used for outputting a reference speed to the speed ring according to the planned position; the speed ring is used for determining a reference current according to the reference speed and the planned speed and transmitting the reference current to the driver; and the current loop is used for outputting current to a controlled motor according to the reference current. And at least some technical problems existing in single-layer impedance control and single-stage PI control in related technologies can be solved.

The application relates to a kind of linearity control method and system of fully mechanized working face based on cascade control system, the method comprises: main regulator obtains the target overall linearity of all scraper conveyors of fully mechanized working face set, and obtains the actual overall linearity of all scraper conveyors of fully mechanized working face obtained by main transmitter monitoring;Main regulator is segmented to target overall linearity and actual overall linearity respectively, and according to the target linearity of each section after target overall linearity segmentation and the actual linearity of each section after actual overall linearity segmentation determines the straightening target of each section scraper conveyor;Main regulator sends the straightening target of each section scraper conveyor to secondary regulator, to control the actuator corresponding to each section scraper conveyor to execute push action according to the straightening target of each section scraper conveyor through secondary regulator, and the displacement of hydraulic support push rod is monitored through corresponding secondary transmitter, improve the control accuracy of the linearity of fully mechanized working face.

The present application relates to carbon nanotube preparation technical field, provide a kind of carbon nanotube fluidized bed temperature cascade control system and method, system includes by stainless steel reactor, reactor heating furnace body, gas cabinet and gas package heating furnace body etc. Main, vice temperature cascade control subsystem is formed. Main temperature cascade control subsystem is formed by T reactor temperature control thermocouple, TC main controller and other components closed loop control, ensure that reactor basic temperature is stable;Vice temperature cascade control subsystem is controlled to gas package heating furnace body by similar components, to preheat gas influences reactor temperature. System also introduces feedforward control, TC main controller collects temperature, voltage, flow and other data, predicts disturbance and adjusts set value in advance, adjusts heating power by reactor heating power regulator and gas package heating power regulator, realizes the accurate control to reactor temperature. The present application effectively improves the response speed and precision of temperature control, guarantees the quality and stability of carbon nanotube production.

The invention relates to a relay cascade control system and method for a grouped heavy haul train, and belongs to the technical field of cascade control, the relay cascade control system comprises a master control locomotive and a master control operation end ECP control device A in the master control locomotive, and a slave control locomotive and a slave control operation end ECP control device B and a slave control operation end ECP control device A in the slave control locomotive; a master control operation end ECP control device A sends a first message to a slave control operation end ECP control device B according to set train marshalling information, receives a second message returned by the master control operation end ECP control device A and then generates a relay reconnection result, and a master control marshalling and a slave control marshalling are initialized by combining the slave control operation end ECP control device A to obtain initialization results; and the master control operation end ECP control equipment A broadcasts an operation mode authorization instruction and sends a braking control instruction to the slave control operation end ECP control equipment A so as to control the slave control marshalling to execute braking or relieving operation, and reliable distributed cooperative braking control over the heavy-load marshalling train is achieved.

The invention relates to the technical field of industrial automation and fluid conveying control, in particular to a PLC-based liquid level safety pipeline conveying cascade control system, which comprises a data acquisition module for generating fluid state information and extracting liquid level main loop characteristics, flow auxiliary loop characteristics and PLC scanning period characteristics; the elastic impedance modeling module is used for generating an impedance matching coefficient, an effective damping ratio and coherent response delay time; the compensation operator generation module is used for generating a decoupling elastic impedance control law; the actuating mechanism control module is used for determining a control instruction for the regulating valve actuating mechanism; the stability closed-loop correction module is used for calculating a control law stability index and correcting a nonlinear damping compensation operator; the problem of nonlinear instability of an executing mechanism under the small-opening-degree working condition is effectively solved, the invalid reciprocating action of the adjusting valve is greatly reduced, and the mechanical fatigue and overheating risks caused by high-frequency oscillation are avoided.

The present invention relates to the technical field of electrolysis cell control. Disclosed are a method and system for controlling a separator liquid level during hydrogen production by water electrolysis. In the present invention, the separator liquid level is used as a primary variable, and the make-up water flow rate is used as a secondary variable, forming a cascade control system. In addition, the change values of an electrolysis system pressure, electrolysis cell power, and an alkaline solution temperature are used as feed-forward signals and are respectively input into feed-forward controllers. Output values are summed and then used, together with the cascade control system, to form a feed-forward-cascade control system. The control method can achieve precise control of the liquid level on a hydrogen side and the liquid level on an oxygen side, thereby avoiding the problem of an excessive difference in liquid level between the hydrogen side and the oxygen side caused by changes in the system pressure, the electrolysis cell power, the alkaline solution temperature, and the make-up water flow rate, avoiding the problem of equipment damage and even personal injuries resulting from the risk of explosion due to mixing of gases on two sides when the liquid levels are too low, and avoiding economic losses caused by protective shutdown triggered by high or low liquid level alarms.

The application discloses a kind of robot motion control method and application based on real-time sensing of multiple ranging sensors, for the mechanical arm control of industrial robot, by controlling two-stage mechanical arm coordinated action to run to workpiece approximate measurement point, according to the real-time sensing posture and distance of workpiece of front ranging sensor, real-time control arm makes that front end execution head gradually approaches workpiece, reaches predetermined distance and starts suction cup to adsorb workpiece, arm switches to free mode, subsequently carries out measurement.The application realizes the real-time posture adjustment and distance control of mechanical arm execution head and measured workpiece by using the continuous point position control function of mechanical arm, combined with the front end distance sensing of execution head, so that the automatic coating quality detection of industrial detection robot on production line under the condition of complex large workpiece hanging swing state becomes possible, mechanical arm cascade control, system installation is simple and reliable, reduces the space occupation of motion module.

A cascade control system for coordinating and controlling carbon emissions associated with operating building equipment distributed across multiple subsystems includes a first controller configured to generate carbon emissions targets for each of the multiple subsystems using a predictive control process that accounts for aggregate carbon emissions of the multiple subsystems predicted to result from the carbon emissions targets. The cascade control system also includes a plurality of second controllers, each corresponding to one of the multiple subsystems, configured to generate control decisions for the building equipment of the corresponding subsystem that are predicted to cause the building equipment to achieve the carbon emissions target of the corresponding subsystem, and to operate the building equipment of the corresponding subsystem using the control decisions.

The application discloses a cascade control system and control method of a silicon carbide epitaxial device. The system comprises a PLC control module, a hardware interlock device, a host computer and a sensor. The PLC control module comprises an interlock processing module connected with an output mapping module and a signal output module. The host computer has an interlock processing module connected with a logic processing module and a signal output module. The PLC control module is electrically connected with the host computer through Ethernet or other real-time buses. The system adds a matching corresponding interlock processing module in the host computer and the PLC control module. The interlock logic of the interlock processing module is consistent with the interlock logic of the interlock processing module in the hardware interlock device. When the hardware interlock device fails, the interlock system can still work, the safety of the epitaxial device is improved to the maximum, and the safety hidden danger when the hardware interlock device fails can be effectively avoided.

This invention relates to a cascaded heading control method and system for unmanned surface vessels (USVs). The method includes the following steps: constructing an inner-loop heading control system based on an FOPID controller, used to output a control quantity to drive the USV's steering system based on the deviation between the USV's desired heading and its actual heading; constructing an outer-loop heading control system based on an ADRC controller, used to output the USV's desired heading based on the deviation between the USV's desired heading and its actual heading, as well as the USV's current total disturbance; using the USV's desired heading output from the outer-loop heading control system as the input to the inner-loop heading control system to form a cascaded control system; inputting a step signal into the cascaded control system to simulate the USV's desired heading, thereby controlling the USV's heading through the cascaded control system. This invention effectively improves the heading maintenance and tracking capabilities of high-speed USVs in complex sea conditions, enhancing the reliability and safety of USV surface operations.

To improve adjustment of a PDI parameter in control of a dehumidifier.SOLUTION: The cascade control system 200 of the dehumidifier 202 for controlling the moisture level comprises a heater 210 for adjusting the moisture level of the outgoing process air by heating the incoming reactivation air, a primary control module 220 for controlling the moisture level by controlling the dehumidifier 202, and a secondary control module 230 for controlling the temperature of the incoming reactivation air to match a desired temperature set point SP2 by controlling the heater 210. The primary control module 220 is a model predictive control (MPC) module configured to provide as outputs the desired temperature set point SP1 of the secondary control module while adjusting the moisture level to match the desired moisture set point SP2, and configured to predict a future moisture level and calculate the desired temperature set point SP2 of the secondary control module 230 based on the predicted moisture level.SELECTED DRAWING: Figure 2

Method for operating a comminution device with a rotor (1) having a large moment of inertia, in particular a chipper, shredder, refiner, crusher or mill, wherein the comminution device - includes an electric primary drive (12) for driving the rotor (1) during the comminution operation and - an electric secondary drive (15) for accelerating and / or decelerating the rotor (1) outside of the comminution operation, as well as - a power converter (16) for supplying the secondary drive (15) with electrical energy, - a rotary encoder (20) for detecting the rotation of the rotor or secondary drive (15), - an evaluation unit (19) for recording and evaluating the signals from the rotary encoder (20), - a first controller (21) and a second controller (22) for outputting a manipulated variable to the power converter (16), and - a data processing and control unit (17), wherein a) the primary drive (12) is de-energized or the data processing and control unit (17) de-energizes the primary drive (12), b) the data processing and control unit (17) outputs a signal about the target speed to the first controller (21), c) the rotary encoder (20) detects the number of pulses generated by the rotation of the secondary drive (15) and outputs it as a signal to an evaluation unit (19), d) the first controller (21) in a first control loop extracts the actual rotational speed from the signals of the evaluation unit (19), compares the actual rotational speed with the target rotational speed and determines a manipulated variable from the comparison, e) the first controller (21) outputs the manipulated variable to the converter (16), and f) the process steps c) to e) are repeated until the target rotational speed is reached, and wherein the rotor (1) is positioned g) upon reaching the first knife change position, a reference signal is generated and output to the data processing and control unit (17), h) the data processing and control unit (17) outputs a signal about the target position of the rotor (1) for the next knife change position to the second controller (22), i) the evaluation unit (19) determines the actual position of the rotor (1) from the number of signals from the rotary encoder (20) after generating the reference signal and outputs it to the second controller (22), j) the second controller (22) in a second control loop compares the actual position with the target position, determines a manipulated variable from the comparison and outputs the manipulated variable to the converter (16), wherein k) the process steps i) to j) are repeated until the target position is reached, and wherein I) the first control loop and second control loop form a cascade control system.

The application discloses a kind of cascade control system and method of instrument vacuum pump system, the system includes multiple vacuum pumps, ion rules, front-stage rules, serial data collector, industrial integrated machine etc..Industrial integrated machine has data monitoring and data traceability function. Operator executes the start-stop of vacuum pump through industrial integrated machine and only needs mode activation, system self-checking, cascade start-stop operation. Compared with prior art, the serial data acquisition device is used in the application to replace PLC which needs power distribution cabinet power supply, so as to reduce the size of the equipment; the system self-checking, data traceability and human confirmation function are added; the man-machine interaction is enhanced in the automatic process, the operation threshold and the failure probability are reduced, and the management efficiency of the equipment is improved.

The invention discloses a laser equipment control system for heterogeneous cascade control. The laser equipment control system comprises an upper computer, a master station module and at least one slave station module, the slave station module comprises a slave station chip, a slave station FPGA and a slave station processor. The master station module and the slave station chip establish communication connection based on an EtherCAT protocol; the slave station chip is connected with the slave station FPGA through a high-speed parallel interface, and the slave station processor is connected with the slave station FPGA; the system comprises a cascade working mode and an independent working mode. And the slave station processor receives a control instruction of the upper computer, transmits the control instruction to the slave station FPGA, controls the working state of the laser equipment, collects state information and transmits the state information back to the upper computer. The high-speed parallel interface between the slave station chip and the slave station FPGA replaces a traditional serial interface, the data transmission rate is greatly improved, the high-real-time control requirement is met, the two modes are flexibly switched, multiple slave station modules do not need to be forcibly configured, and the application flexibility and expansibility are improved.

The invention belongs to the technical field of new energy power generation, and provides a new energy cascade control system parameter optimization method based on improved particle swarm optimization, which comprises the following steps: firstly, constructing a cascade control framework including new energy station control and converter control; and then uniform initialization of a particle swarm is realized by introducing a Latin hypercube sampling technology, and optimization of the dynamic performance of the system is realized by adopting a nonlinear decreasing inertia weight strategy and a dynamic balance algorithm exploration and development process and taking an integral time weighted absolute error as a loss function. The method effectively overcomes the problem that a traditional parameter setting method depends on experience and is easy to fall into local optimum, can adaptively optimize a plurality of control loop parameters in the cascade control system, remarkably improves the dynamic responsiveness, anti-disturbance capability and steady-state precision of the system in grid-connected operation, and improves the reliability of the system. And the operation reliability and the power grid supporting capability of the new energy power station are enhanced.

The invention discloses a heat exchanger feed-forward cascade control system and method based on load change compensation, and belongs to the field of process industrial automation control and other heat exchangers with the outlet temperature needing to be rapidly adjusted along with loads. According to the system, on the basis of a traditional outlet temperature-heat-containing medium flow cascade structure, a load obtaining module and three kinds of feedforward components including a steady state, a load increasing component and a load reducing component are arranged, a unit target load, an actual load and the change rate of the unit target load and the actual load are converted into flow pre-adjusting variables, and the flow pre-adjusting variables and main loop PID output are overlapped to form an auxiliary loop set value; and the auxiliary loop PID drives the flow regulating valve to quickly track. According to the method, temperature difference margin logic is constructed by combining inlet and outlet gas temperatures and inlet and outlet heat-containing medium temperatures, on the premise that the heat exchange safety boundary is guaranteed, rapid tracking of the outlet gas temperature of the heat exchanger on a target value is achieved, and the expansion machine power tracking capacity and the energy efficiency and safety of a compressed air energy storage system are improved.

The invention relates to a gas extraction pipeline concentration and flow cascade control system and method, and belongs to the technical field of coal mine gas extraction. The problems that an existing single-loop control system is slow in response and weak in anti-interference capacity, and concentration and flow cannot be stabilized at the same time are solved. The system comprises an extraction pipeline network, an extraction pump set and an intelligent control system, the intelligent control system adopts a cascade structure of a concentration main ring and a flow auxiliary ring, parameters are detected in real time through a concentration sensor and a flow sensor, and a main controller processes concentration deviation and outputs a flow set value; the auxiliary controller processes the flow deviation to control the executing mechanism to adjust the working condition of the extraction pump set. The cascade control system has the effects that the response speed, the anti-interference capability and the control precision of the system are improved, and the safe and stable operation of the gas extraction process is ensured.

The invention relates to the technical field of motor driving and control, discloses a design method of a six-phase current source inverter cascade control system, and aims to solve the problems of high cost, large harmonic loss, poor stability of a cascade system and the like of an existing six-phase motor driving middle and high voltage scheme. A hybrid power architecture of amplitude modulation of a front-stage wide bandgap device and phase modulation of a rear-stage silicon device is adopted, cooperative suppression of third harmonics and common-mode voltage is realized through subspace mapping, and the problems of voltage unbalance and parameter disturbance of cascade units are solved by combining a dynamic voltage-sharing algorithm and robust prediction control. According to the invention, the operation efficiency of the high-speed motor can be effectively improved, the hardware cost is reduced, and the stability of the system in load abrupt change and wide rotating speed range is enhanced.

The invention relates to a cascade control system for a dehumidifier for controlling a humidity level and a dehumidifier system for controlling a humidity level. The cascade control system comprises: a heater for adjusting the humidity level of the outlet treated air by heating the inlet reactivated air; a main control module for controlling the humidity level by controlling the dehumidifier; a secondary control module for controlling the temperature of the inlet reactivated air to match a desired temperature setpoint by controlling the heater; wherein the main control module is configured to adjust the humidity level to match the desired humidity setpoint, while providing the desired temperature setpoint as an output to the secondary control module; wherein the master controller is a model predictive control module configured to predict a future humidity level and calculate a desired temperature setpoint for the secondary control module based on the predicted humidity level.

The disclosure provides a multi-fire pool cascade control system, which comprises: a float liquid level meter and a drop-in liquid level meter corresponding to each fire pool, an electromagnetic flow meter of an overflow pipe of a high-level fire pool, a high-level-to-medium-level fire pool water supplement electric valve, a high-level-to-medium-level fire pool electromagnetic flow meter, a high-level-to-low-level fire pool water supplement electric valve, a high-level-to-low-level fire pool electromagnetic flow meter, a medium-level fire pool water outlet electromagnetic flow meter, a low-level fire pool water outlet electromagnetic flow meter, a medium-level-to-low-level fire pool water supplement electric valve, a medium-level-to-low-level fire pool electromagnetic flow meter, a medium-level fire pool overflow pipe liquid level switch, a diversion tunnel-to-low-level fire pool water supplement electric valve, a diversion tunnel-to-low-level fire pool electromagnetic flow meter and a PLC control system, so that the automatic water supplement function of the medium-level and low-level fire pools can be realized based on the collection, judgment and calculation of the analog and switch signals of the PLC control system, and the utilization rate of clean water sources is effectively improved.

This invention relates to a control system for precisely controlling the concentration of sodium hypochlorite produced by a falling film process. The system comprises: a fresh alkali solution input component, a chlorine gas input component, a synthesis component, a detection component, a product buffer and conveying component, a qualified product output component, a non-qualified product circulation component, and a control component. When the product concentration is under normal production conditions, the control component is connected to both the fresh alkali solution input component and the chlorine gas input component to form a ratio control system. When the product concentration is under unqualified conditions, the control component is connected to both the detection component and the chlorine gas input component to form a cascade control system. This invention can reduce overchlorination and precisely control the concentration of sodium hypochlorite. Furthermore, this invention can reduce the frequency of sodium hypochlorite salt buildup and blockage in the detection component, ensuring long-term stable operation of the device.

A cascade control system of a dehumidifier for controlling a humidity level including: a heater for adjusting the humidity level of the outlet process air by heating inlet reactivation air, a primary control module for controlling the humidity level by controlling the dehumidifier, and a secondary control module for controlling the temperature of inlet reactivation air to match a desired temperature setpoint by controlling the heater. The primary control module is configured to regulate the humidity level to match a desired humidity setpoint while providing the desired temperature setpoint for the secondary control module as output. The primary controller is a Model Predictive Control, MPC, module configured to predict future humidity levels and to calculate the desired temperature setpoint for the secondary control module based on the predicted humidity levels.

A high-voltage switch reluctance motor cascade control system belongs to the technical field of switch reluctance motor control. The system comprises a power unit, the power unit comprises rectifier circuits and drive bridge circuits connected in sequence, the number of drive bridge circuits is the same as the number of windings in the switch reluctance motor and corresponds one by one, and a main control unit is further arranged for controlling the on-off state of the drive bridge circuits. The power unit comprises a plurality of units, all the drive bridge circuits corresponding to the same phase windings in the switch reluctance motor in all the power units are connected in series to form a drive bridge group, and the two ends of the drive bridge group are connected to the corresponding windings in the switch reluctance motor. In the application, the drive bridge circuits in the multiple power units are connected in series and connected to the windings in the switch reluctance motor, the control of each drive bridge circuit is controlled, and the high-voltage output of the switch reluctance motor is further realized by using the switch tube with low voltage resistance.

The utility model provides a multi-stage preheater control system for a high-pressure acid leaching process, which is used for controlling a multi-stage preheater used in the high-pressure acid leaching process, the multi-stage preheater comprises at least two stages of preheaters which are connected in series, and each stage of preheater comprises a cascade control system. The cascade control system comprises one or more feeding pumps used for introducing ore pulp into the preheater so as to preheat the ore pulp; the feeding flow controller is used for regulating and controlling the feeding flow of the feeding pump; the liquid level controller is used for regulating and controlling the liquid level of ore pulp in the preheater; the flow meter is in communication connection with the feeding flow controller and is used for monitoring the feeding flow and transmitting feeding flow information to the feeding flow controller; and the liquid level meter is in communication connection with the liquid level controller and is used for monitoring the liquid level of the ore pulp and transmitting the liquid level information of the ore pulp to the liquid level controller.