CN113290695B - Filling slurry concentration regulation and control method and system based on current signal feedback - Google Patents
Filling slurry concentration regulation and control method and system based on current signal feedback Download PDFInfo
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Abstract
The invention discloses a filling slurry concentration regulation and control method and system based on current signal feedback. Collecting the working current of a motor in the stirring stage of filling slurry preparation; determining the data of the filling slurry concentration through the working current of the motor in the stirring stage based on a preset digital relation model; wherein, a digital relation model is established based on the motor working current and the filling slurry concentration in the stirring stage; determining whether the data of the filling slurry concentration meets the design requirement of filling slurry preparation or not according to a preset filling slurry concentration value; and adjusting the amount of the filling material of the feeding section according to the addition and subtraction amount of the filling material of the feeding section through a PID control loop prepared by the filling slurry. According to the invention, the working current of the motor in the stirring stage is collected, the concentration of the filling slurry in the stirring stage is monitored in real time and fed back and adjusted in time, so that the stability of the concentration of the filling slurry is improved, and compared with the existing adjusting and controlling method, the method has high efficiency and stability.
Description
Technical Field
The invention belongs to the technical field of mine filling, and relates to a method and a system for regulating and controlling slurry filling concentration based on a current signal in mine filling, in particular to a feedback method and a feedback system for regulating and controlling filling slurry concentration based on a numerical value of an electrical signal in a stirring stage.
Background
The preparation stage of mine filling slurry is a dynamic continuous process, and the existing operation process generally comprises three automatic control systems, namely an open-loop control system in a feeding stage, a liquid level feedback regulation system in a stirring stage and a closed-loop control system for the feedback regulation of the concentration of the filling slurry in a stirring outlet pipeline.
Wherein, open loop control system is according to ground paste design ratio control feeding volume, and closed loop control system installs concentration meter and flowmeter additional at agitated vessel bottom pipeline, mainly to filling ground paste concentration and stirring liquid level real-time supervision, contrast and design value difference, feeds back to the PLC system of ground paste feeding stage (metering device etc.) or bottom pipeline valve, adjusts ground paste ratio (material quantity or water consumption) or adjusts bottom pipeline valve degree of opening and shutting in real time. Fig. 1 shows a prior art fill slurry feedback regulation system based on a stirred outlet line.
As shown in fig. 1, in the whole automatic control system for filling slurry preparation, a closed-loop system is used to realize the feedback adjustment of filling slurry based on the stirring outlet pipeline, when the measured filling slurry concentration of the bottom concentration meter is different from the designed concentration, the system responds and feeds back to the feeding stage, and the subsequent filling slurry concentration is adjusted by increasing or decreasing the material usage amount. However, even if the material usage amount is adjusted according to the system feedback information, the filling slurry which is generated before the adjustment and does not meet the design concentration requirement is conveyed to the underground by a pipeline, and the adjustment and control measures adopted at this time have no practical significance, but can cause large oscillation of the whole preparation system. Therefore, the adjusting process has obvious defects of long response time, lagged adjusting and controlling measures and the like.
For example, the paste thickener with adaptive control of underflow concentration and the accurate monitoring and control method disclosed in chinese patent application No. 201810332168.0, wherein the thickener includes a thickening tank, a dilution flocculation system, a shearing and dewatering system, an underflow circulation system, a monitoring system, a prediction system, and an automatic control system, and real-time monitoring data is obtained by the monitoring system including various meters such as a thickener, a flowmeter, a turbidimeter, a pressure sensor, and a torque sensor, and the monitoring data is transmitted to the prediction system, and the prediction system predicts the underflow concentration, the overflow turbidity, and the torque in the next period, and the automatic control system sends control instructions to a valve, a delivery pump, and a driving motor according to the prediction result to perform real-time control, thereby ensuring that the underflow quality concentration is stabilized near a target value. In the paste filling process of the patent application, according to the strength of a filling body required by paste filling, an automatic regulation and control system is used for automatically regulating and controlling the target underflow quality concentration by setting the target underflow quality concentration, a monitoring device is integrally arranged at the bottom of the device, the automatic regulation and control of the system is carried out according to single data of the strength of the required filling body in the regulation and control process, the target underflow quality concentration is set, the strength of the filling body is not only related to the slurry quality concentration, but also related to the accurate proportioning of various filling materials, and the monitoring device arranged at the bottom has hysteresis, so that the defects of long response time, hysteresis of regulation and control measures and the like in the prior art scheme can not be solved.
The stability and accuracy of the whole mine filling slurry concentration control system depend on the timeliness of a control strategy, however, the method for feedback adjustment of the filling slurry concentration through the closed-loop control stage is feedback response, the problems of nonlinearity, slow time variation, large fluctuation of incoming materials, long transition time, hysteresis and the like exist in the preparation process, the stability of the filling slurry concentration in a slurry stirring outlet pipeline is seriously reduced, when a concentration meter installed on the stirring outlet pipeline identifies that the filling slurry concentration does not accord with the design concentration, the slurry which does not accord with the design requirement is conveyed in the pipeline, when a feeding section makes a response, hysteresis exists obviously, and the system is always in the feedback adjustment process, so that the high efficiency and the stable operation of the system are influenced.
From the automation point of view, besides the open-loop control of the feeding stage, the existing feedback regulation has obvious hysteresis and the influence of unstable input of filling materials, so that the feeding stage is not advanced based on the feedback regulation of the concentration of the filling slurry at the stirring outlet pipeline.
The mixer working current acquisition and data transmission circuit for the on-line monitoring of the concrete homogeneity disclosed in the Chinese patent application with the application number of 201420594093.0 has the working process that: in the process of mixing concrete by the mixer, the alternating current sensor monitors the working current of the mixer motor in real time and outputs the monitored current signal, and the current signal and the clock signal are transmitted to the computer through the RS-485 communication circuit module, so that accurate and reliable data are provided for the computer to calculate and judge the homogeneity of the concrete according to the current of the mixer. After the computer calculates and judges the homogeneity of the obtained concrete according to the current of the mixer and displays the homogeneity, an operator of the mixing station can monitor the homogeneity of the fresh concrete on line in real time in the concrete mixing process, the working strength of the operator can be effectively reduced, the yield of the concrete is improved, and the production efficiency of the concrete is increased.
The patent application mainly provides a circuit for calculating the homogeneity of concrete through the current of a mixer and displaying the homogeneity of concrete through a computer.
Disclosure of Invention
Aiming at the problems of nonlinearity, slow time change, large fluctuation of supplied materials, long transition time, hysteresis and the like in the existing filling slurry preparation process, the invention aims to provide a filling slurry concentration regulation and control method based on current signal feedback, and the method has the advantages of real-time monitoring, timely feedback, stable output and the like.
In order to achieve the above object, the present invention provides a method for controlling a concentration of a filling slurry based on current signal feedback, comprising the steps of:
step S1: in the stirring stage of filling slurry preparation, collecting the working current of a motor in the stirring stage;
step S2: determining filling slurry concentration data through the motor working current in the stirring stage based on a preset digital relation model; the digital relation model is established based on the motor working current and the filling slurry concentration in the stirring stage;
step S3: determining whether the data of the filling slurry concentration meets the design requirement of filling slurry preparation or not according to a preset filling slurry concentration value; determining the addition and subtraction amount of filling materials at a feeding section for filling slurry preparation according to the preset filling slurry concentration value and the data of the filling slurry concentration if the data of the filling slurry concentration does not meet the design requirement of filling slurry preparation;
step S4: and adjusting the amount of the filling material at the feeding section according to the addition and subtraction amount of the filling material at the feeding section through a PID control loop prepared by the filling slurry.
Preferably, the variables related in the digital relation model include the increment and decrement of the filling material in the feeding section, the preset filling material amount in the feeding section, the motor working current in the stirring stage, the real-time slurry concentration in the stirring stage, the standard slurry concentration in the stirring stage, the real-time slurry concentration in the output section, the standard slurry concentration in the output section and other variables. Preferably, the corresponding time is calculated by a digital relation model of the motor working current and the filling slurry concentration in the stirring stagetThe filling slurry concentration valueC t The filling slurry concentration valueC t And the preset filling slurry concentration valueC d By contrast, with the difference formula:
to determine the difference
Whether it is within a desired range, wherein if the filling slurry concentration value is within a desired rangeC t Is not in difference
Within the required range, the data indicating the concentration of the filler slurry does not satisfy the design requirements for preparation of the filler slurry.
Preferably, the filling slurry concentration value is identified, the increment and decrement of the filling material at the feeding section are calculated, and the increment and decrement of each filling material are converted by comparing the preset filling slurry concentration value with the motor working current at the stirring stage.
Preferably, the PID control loop adjusts the rotation speed of the corresponding filling material feeding motor and adjusts the corresponding filling material amount according to the filling material to be added or subtracted as required.
In order to achieve the above object, the present invention provides a filling slurry concentration regulation and control system based on current signal feedback, which is used for executing the filling slurry concentration regulation and control method based on current signal feedback, and comprises an open-loop control system, a stirring feedback regulation system and a closed-loop monitoring system; the open-loop control system is a control system for controlling the amount of filling materials at the feeding section according to the design proportion of the preset filling slurry; the stirring feedback adjusting system calculates the addition and subtraction amount of the filling material at the feeding section according to the working current of the motor at the stirring stage and feeds the addition and subtraction amount back to the corresponding control system for adjustment; the closed-loop monitoring system is a monitoring system which is characterized in that a concentration meter and a flowmeter are additionally arranged on a pipeline at the bottom of the stirring equipment, the concentration of the filling slurry and the stirring liquid level are monitored in real time, and the difference between the design value of the filling slurry and the design value of the preset filling slurry in the stirring stage is compared.
Preferably, a PID controller is provided inside the stirring feedback system.
In a preferred scheme, a current data collector is arranged in the stirring feedback system.
In the preferable scheme, a corresponding PID control loop is started in the filling slurry concentration regulation and control system based on current signal feedback according to a programmed logic control program PLC of upper and lower computers of other equipment and instrument valves, and the stability of the filling slurry concentration in the closed-loop monitoring system is realized.
Preferably, in the filling slurry concentration regulation and control system based on current signal feedback, according to a logic control program PLC of an upper computer and a lower computer of other equipment and instrument valves which are programmed, a controlled object in the stirring feedback regulation and control system is set as a motor working current in a stirring stage, and a corresponding PID control loop is started through feedback of the motor working current in the stirring stage, so that the stability of the filling slurry concentration in the closed-loop monitoring system is realized.
According to the technical scheme, the filling slurry concentration regulation and control method and system based on current signal feedback provided by the invention have the advantages that the working current of a motor in the stirring stage is acquired in the stirring stage of filling slurry preparation; determining the data of the filling slurry concentration through the working current of the motor in the stirring stage, and establishing a digital relation model between the filling slurry concentration and the filling slurry concentration on the basis; determining the addition and subtraction amount of filling materials of a feeding section prepared by filling slurry according to the preset filling slurry concentration value and the data of the filling slurry concentration; a PID control loop prepared by filling the slurry.
Drawings
FIG. 1 is a logical relationship diagram of a prior art fill slurry feedback regulation system based on a stirred outlet line.
Fig. 2 is a flowchart illustrating a feedback control method based on the concentration at the stirring stage according to an embodiment of the present invention.
Fig. 3 is a logical relationship diagram showing an automatic control system of a filling slurry preparation process according to an embodiment of the present invention.
Fig. 4 is a logic structure of a feedback control system based on the concentration at the stirring stage according to an embodiment of the present invention.
FIG. 5 is a diagram illustrating the dynamic behavior of the control system under disturbance according to an embodiment of the present invention.
FIG. 6 is a feedback control diagram of a feedback control system based on the concentration at the stirring stage according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments will now be described more fully with reference to the accompanying drawings. The exemplary embodiments, however, may be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
Furthermore, the drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus their repetitive description will be omitted. In the present disclosure, the terms "include", "arrange", "disposed" and "disposed" are used to mean open-ended inclusion, and mean that there may be additional elements/components/etc. in addition to the listed elements/components/etc.; the terms "first," "second," and the like are used merely as labels, and are not limiting as to the number or order of their objects; the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the invention and for simplicity in description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be construed as limiting the invention.
Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In an exemplary embodiment of the present disclosure, a method for regulating and controlling filling slurry concentration based on current signal feedback is provided, which can efficiently and quickly feed back the filling slurry concentration during stirring. Referring to fig. 2, a flow chart of the steps of a feedback control method based on the concentration at the stirring stage according to an embodiment of the present invention is shown, where the method for controlling the concentration of filling slurry based on the current signal feedback in this exemplary embodiment includes the following steps:
step S1: and in the stirring stage of filling slurry preparation, collecting the working current of a motor in the stirring stage.
During actual agitation, the mass concentration (slump) of the filling slurry is closely related to its yield stress, which is the force with which the slurry flows against the resistance to agitation when subjected to shear. Therefore, the slurry having a certain mixing ratio has a lower homogeneity and a lower concentration at the same feed rate, and the resistance to the stirring by the stirrer increases and the power consumed by the stirrer decreases.
Specifically, the power consumed by the stirrer is calculated by a mathematical conversion formula:
the system operating voltage is generally constant and can be considered as a constant, the voltage U is constant, and the power P is proportional to the current I. And obtaining the relation proportion of the consumed power of the motor and the working current in the stirring stage, and calculating to obtain the positive correlation between the working current of the motor and the concentration of the filling slurry in the stirring stage, so that the collection of the working current of the motor in the stirring stage is the key for judging the quality of the filling slurry. Of course, the processing formulas herein may be replaced by other known algorithms.
Step S2: determining the data of the filling slurry concentration through the working current of the motor in the stirring stage based on a preset digital relation model; the digital relation model is established based on the motor working current and the filling slurry concentration in the stirring stage.
It should be noted that, according to the filling materials and filling slurry proportioning data of different mines, in combination with methods such as the existing theory and the like, a high-precision digital relation model between the motor working current and the filling slurry concentration in the stirring stage is jointly established, and variables related in the digital relation model include the adding and reducing amount of the filling materials in the feeding stage, the preset filling material amount in the feeding stage, the motor working current in the stirring stage, the real-time slurry concentration in the stirring stage, the standard slurry concentration in the stirring stage, the real-time slurry concentration in the output stage, and the standard slurry concentration in the output stage.
It should be specially explained that the variables related in the digital relation model are different according to the actual conditions of different mines, the difference of slurry preparation equipment, the change of slurry concentration along with time in the stirring stage and other conditions, the specific conditions of the modeling algorithm formula are also changeable, and the algorithm for establishing the digital relation model is not unique. Specifically, the relational model is adopted to obtain a relational expression between the motor working current and the filling slurry concentration in the stirring stage.
Step S3: determining whether the data of the filling slurry concentration meets the design requirement of filling slurry preparation or not according to the preset filling slurry concentration value; and if the data of the filling slurry concentration does not meet the design requirement of filling slurry preparation, determining the adding and reducing amount of the filling material at the feeding section prepared by the filling slurry according to the preset filling slurry concentration value and the data of the filling slurry concentration.
Specifically, based on the model between the motor operating current and the filling slurry concentration at the stirring stage established in step S2, the current data at step S2 is refined, and the numerical relation model at step S2 is used to calculate the corresponding timetConcentration value of filling slurryC t The filling slurry concentration valueC t And design of filling slurry concentrationC d By contrast, with the difference formula:
to determine the difference
Whether it is within the desired concentration range, wherein if the filling slurry concentration value is within the desired concentration rangeC t Is not in difference
Within the required range, the data indicating the concentration of the filler slurry does not satisfy the design requirements for preparation of the filler slurry.
It should be noted that, when the filling slurry concentration in the stirring stage does not meet the requirement of the preset filling slurry concentration, the filling slurry concentration value is identified, the increment and decrement of the filling material in the feeding section are calculated, and the increment and decrement of the filling material in the feeding section prepared by the filling slurry are determined by comparing the filling slurry concentration value with the motor working current in the stirring stage. Through the step, the specific amount of the filling material in the feeding section can be further determined under the principles of ensuring the performance of the filling body and controlling the filling cost.
Step S4: and adjusting the amount of the filling material of the feeding section according to the addition and subtraction amount of the filling material of the feeding section through a PID control loop prepared by the filling slurry.
As shown in fig. 3, which is a logic relationship diagram showing an automatic control system of a filling slurry preparation process according to an embodiment of the present invention, the difference formula calculates an addition/subtraction amount of a filling material required by a feeding section, and adjusts a rotation speed of a corresponding filling material feeding motor and an amount of the filling material corresponding to the feeding section for a filling material PID control loop that needs to be added or subtracted, so as to ensure stability of the filling material at a stirring stage and solve problems such as hysteresis in the prior art.
It can be seen from the above description of the embodiment that, in the technical scheme of the present invention, the concentration value of the filling slurry is calculated by the working current of the motor, and the comparison is performed according to the concentration value of the filling slurry in the stirring stage and the concentration value of the preset filling slurry, and whether the difference value is within the standard range is calculated and fed back to the upstream control system by PID.
In addition, in an exemplary embodiment of the present disclosure, a filling slurry concentration regulation and control system based on current signal feedback is further provided to execute the above filling slurry concentration regulation and control method based on current signal feedback, so as to realize regulation and feedback of filling slurry concentration in the stirring stage. Referring to fig. 4, a logic structure of a feedback regulation system based on concentration at a stirring stage according to an embodiment of the present invention is shown, including an open-loop control system, a stirring feedback regulation system, and a closed-loop monitoring system.
Firstly, a filling slurry design proportion is preset in an open-loop control system and is used for controlling the amount of filling materials at a feeding section; secondly, the stirring feedback adjusting system calculates the addition and subtraction amount of the filling material at the feeding section according to the working current of the motor at the stirring stage and feeds the addition and subtraction amount back to the corresponding control system for adjustment; and finally, the closed-loop monitoring system is a monitoring system which is characterized in that a concentration meter and a flowmeter are additionally arranged on a pipeline at the bottom of the stirring equipment, the concentration of the filling slurry and the stirring liquid level are monitored in real time, and the difference between the stirring stage and the preset design value of the filling slurry is compared.
Specifically, a current data collector and a PID controller are arranged in the stirring feedback system. When the concentration of the filling slurry in the stirring stage does not accord with the preset concentration range of the filling slurry, aiming at a filling material PID control loop needing to be increased or decreased, the rotating speed of a corresponding filling material feeding motor is adjusted, and the amount of the filling material corresponding to the feeding section is adjusted. FIG. 5 is a diagram showing the dynamic process of the control system under disturbance according to the embodiment of the present invention, and it can be seen from the figure that the output response of the system reaches the desired time for the first timet r Referred to as rise time, which measures how fast the system responds from another perspective,t r the smaller the response is, the faster the response is, the core point of the patent is that the response is shortenedt r To shorten the response time when the concentration is unstable.
More specifically, as shown in fig. 6, the feedback regulation diagram is a feedback regulation diagram of a feedback regulation system based on the concentration at the stirring stage according to an embodiment of the present invention, and the present invention selects the motor operating current signal characteristic at the stirring stage as the characteristic of the filling slurry concentration, so as to perform intelligent regulation and control of each filling material at the feeding stage.
It should be specially explained that, according to the requirements of the filling slurry preparation process flow, a logic control program PLC of an upper and lower computer of other equipment and instrument valves is programmed, and according to the stirring feedback regulation system, in the stirring feedback regulation system, a controlled object is set as the working current of the motor in the stirring stage, and through the feedback of the working current of the motor in the stirring stage, the performance of the filling body is ensured, and the filling cost is controlled, a corresponding PID control loop is started, so as to realize the stability of the concentration of the filling slurry in the closed-loop monitoring system.
Through the specific embodiment, it can be determined that the filling slurry concentration regulation method and the filling slurry concentration regulation system based on current signal feedback provided by the invention have at least the following advantages:
1. the method of 'feedback regulation and control of filling slurry concentration based on current signals' monitors in real time in the stirring process, and quickly regulates the dosage of corresponding filling materials, so that the fluctuation of the filling slurry concentration is small, and the stability is high.
2. According to actual mine filling data statistics, compared with the traditional pipeline filling slurry concentration feedback control based on a stirring outlet, the method for 'current signal-based filling slurry concentration feedback control' reduces the cement consumption by about 5% under the same filling task, saves the cost, and improves the real-time stability of the filling slurry concentration through accurate control.
3. Compared with the prior art that a concentration meter and a flowmeter are additionally arranged on a pipeline at the bottom of the stirring equipment, the intelligent data analysis and system regulation are carried out by acquiring current signals in the stirring stage, so that the hysteresis of feedback regulation of a stirring outlet is effectively avoided, the feedback regulation time of the system is greatly improved, the stable output of the filling slurry at the pipeline at the stirring outlet according to the designed concentration is further realized, and a foundation is laid for unattended intelligent filling.
4. The preparation stage of the mine filling slurry is a dynamic continuous process, the stirring stage is connected between the feeding stage and the real-time discharging stage, and the stirring stage is a key position after starting from the beginning of the process, so that the intelligent and accurate regulation and control of the proportion of each filling material in the feeding stage are very necessary by utilizing the real-time feedback of the filling slurry in the stirring stage. The following is a specific example for explaining the present invention in more detail, and the example does not limit the present invention in any way.
Taking the preparation of a filling slurry based on "dry-inert material" for a certain mine as an example, it is briefly described below. The filling material for the mine consists of three parts, namely a cementing material, water and a coarse aggregate, and according to the initial design proportion of filling slurry, the using amount of the cementing material is certain, so that the mechanical property of a filling body is necessarily reduced if the using amount of the cementing material is reduced, and meanwhile, the using amount of the cementing material is increased in order to regulate and control the concentration of the filling slurry, so that the filling cost is inevitably increased. The basic criterion for the regulation is therefore the proportion between coarse aggregate and filling water.
Based on the established digital relation model between the motor working current and the filling slurry concentration data in the stirring stage, a PLC (programmable logic controller) program is programmed, the stirring motor working current is taken as a regulation object, the filling slurry concentration is represented by current characteristics, and whether the filling slurry concentration meets the design concentration requirement is judged in real time. When the current does not meet the requirement, back-calculating according to the real-time currenttConcentration of filling slurry at timeC t Based on this, the following control measures are implemented.
(1) When in use
In the process, the use amount of the filling water can be increased or the use amount of the filling coarse aggregate can be reduced for regulation and control. It should be noted that the instability of the concentration of the filling slurry is caused by the diversity of the coarse aggregate and the high cost of the mine coarse aggregate, and the control measures are taken to reduce the amount of the filling coarse aggregate in order to control the filling cost.
The mine is designed with a mortar ratio of a
Then there is
And further calculates the reduced amount of coarse aggregate as
And the use amount of the filling coarse aggregate is adjusted through a PID loop, so that the real-time regulation and control of the filling slurry are realized.
Wherein:
the dosage of the cementing material (unit kg);
the dosage (unit kg) of the coarse aggregate is filled;
filling the dosage (unit kg) of the coarse aggregate at the time t;
the amount of the coarse aggregate to be filled is reduced (in kg).
(2) At that time, the method can be adjusted and controlled by reducing the using amount of filling water, increasing the using amount of filling coarse aggregate or increasing the using amount of cementing materials. It should be noted that increasing the amount of the filling coarse aggregate or the cementing material increases the filling cost, and when the default amount of the filling coarse aggregate is small and the liquid level is not affected, the amount of the filling coarse aggregate is not increased, and the mortar ratio is obviously higher than the designed value, which is also beneficial to improving the performance of the filling body, so the regulation and control measures are performed in a manner of reducing the water consumption for filling. The mine is designed with a fill slurry concentration of b, i.e.
Then there is
And then calculating the reduced filling water usage
And the amount of filling water is adjusted through a PID loop to realize real-time regulation and control of the filling slurry, wherein:
the water consumption (unit kg) is used for filling;
filling water consumption (unit kg) at the time t;
the amount of water used for filling (unit kg) was reduced.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; while the invention has been described in terms of the preferred embodiments and applications, it will be understood by those skilled in the art that the invention is not limited to the disclosed embodiments and examples, but rather, the invention is capable of modifications in various obvious respects, all without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. A filling slurry concentration regulation and control method based on current signal feedback is characterized by comprising the following steps:
step S1: in the stirring stage of filling slurry preparation, collecting the working current of a motor in the stirring stage;
step S2: determining filling slurry concentration data through the motor working current in the stirring stage based on a preset digital relation model; the digital relation model is established based on the motor working current and the filling slurry concentration in the stirring stage;
the motor working current in the stirring stage is based on a corresponding logical relation between the filling slurry mass concentration and the yield stress in the slurry stirring process and serves as a theoretical basis;
variables related in the digital relation model comprise the adding and reducing amount of filling materials in the feeding section, the preset filling material amount in the feeding section, the working current of a motor in the stirring stage, the real-time slurry concentration in the stirring stage, the standard slurry concentration in the stirring stage, the real-time slurry concentration in the output section and the standard slurry concentration in the output section;
step S3: determining whether the data of the filling slurry concentration meets the design requirement of filling slurry preparation or not according to a preset filling slurry concentration value; determining the addition and subtraction amount of filling materials at a feeding section for filling slurry preparation according to the preset filling slurry concentration value and the data of the filling slurry concentration if the data of the filling slurry concentration does not meet the design requirement of filling slurry preparation;
step S4: and adjusting the amount of the filling material at the feeding section according to the addition and subtraction amount of the filling material at the feeding section through a PID control loop prepared by the filling slurry.
2. The method of claim 1, wherein the current signal feedback-based method of controlling the concentration of the filler slurry,
calculating corresponding time by using a digital relation model of the motor working current and the filling slurry concentration in the stirring stagetThe filling slurry concentration valueC t The filling slurry concentration valueC t And the preset filling slurry concentration valueC d By contrast, with the difference formula:
to determine the difference
Whether or not it is within the required range, wherein,
if the filling slurry concentration valueC t Is not in difference
Within the required range, the data indicating the concentration of the filler slurry does not satisfy the design requirements for preparation of the filler slurry.
3. The method of claim 1, wherein the current signal feedback-based method of controlling the concentration of the filler slurry,
and identifying the filling slurry concentration value, calculating the adding and reducing amount of filling materials at the feeding section, and comparing the preset filling slurry concentration value through the filling slurry concentration value and the working current of the motor at the stirring stage to convert the adding and reducing amount of each filling material.
4. The method of claim 1, wherein the current signal feedback-based method of controlling the concentration of the filler slurry,
and the PID control loop adjusts the rotating speed of the corresponding filling material feeding motor according to the filling material added or subtracted as required, and adjusts the corresponding filling material amount.
5. A current signal feedback-based filling slurry concentration regulation system for performing the current signal feedback-based filling slurry concentration regulation method according to any one of claims 1 to 4, comprising an open-loop control system, a stirring feedback regulation system, and a closed-loop monitoring system;
the open-loop control system is a control system for controlling the amount of filling materials at the feeding section according to the design proportion of the preset filling slurry;
the stirring feedback adjusting system calculates the addition and subtraction amount of the filling material at the feeding section according to the working current of the motor at the stirring stage and feeds the addition and subtraction amount back to the open-loop control system for adjustment;
the closed-loop monitoring system is a monitoring system which is characterized in that a concentration meter and a flowmeter are additionally arranged on a pipeline at the bottom of the stirring equipment, the concentration of the filling slurry and the stirring liquid level are monitored in real time, and the difference between the design value of the filling slurry and the design value of the preset filling slurry in the stirring stage is compared.
6. The system of claim 5, wherein the current signal feedback-based control system for the concentration of the fill slurry,
and a current data collector is arranged in the stirring feedback adjusting system.
7. The system of claim 5, wherein the current signal feedback-based control system for the concentration of the fill slurry,
and a PID controller is arranged in the stirring feedback adjusting system.
8. The system of claim 5, wherein the current signal feedback-based control system for the concentration of the fill slurry,
and starting a corresponding PID control loop according to the stirring feedback regulation system in the filling slurry concentration regulation and control system based on current signal feedback according to a programmed logic control program PLC of upper and lower computers of other equipment and instrument valves, so as to realize the stability of the filling slurry concentration of the closed-loop monitoring system.
9. The system of claim 8, wherein the current signal feedback-based control system for the concentration of the fill slurry,
in the filling slurry concentration regulation and control system based on current signal feedback, according to the programmed logic control program PLC of the upper and lower computers of other equipment and instrument valves, and according to the stirring feedback regulation system, wherein,
in the stirring feedback regulation system, a controlled object is set as the working current of the motor in the stirring stage, and a corresponding PID control loop is started through the feedback of the working current of the motor in the stirring stage, so that the stability of the concentration of the filling slurry in the closed-loop monitoring system is realized.
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