A method of calcium carbonate mill control, calcium carbonate mill, product and media

Abstract

A calcium carbonate grinding control method, a calcium carbonate grinding machine, a product and a medium. In the method, after the calcium carbonate grinding machine starts to operate, the internal and external pressure values of the filtering device are monitored in real time by a pressure sensor to obtain the internal pressure value, the external pressure value and the internal and external pressure difference; when the internal and external pressure difference reaches a preset pressure difference warning threshold, the opening of the air valve is adjusted to increase the air speed in the filtering device; when the internal and external pressure difference does not reach the preset pressure difference warning threshold, the particle size distribution at the inlet of the filtering device is monitored to obtain the real-time small particle size product rate; the air valve opening adjustment amount is calculated according to the real-time pressure difference, the preset optimal pressure difference, the preset optimal small particle size product rate and the real-time small particle size product rate; and the air valve opening is adjusted in real time according to the air valve opening adjustment amount to obtain the latest air valve opening. The technical solution provided in the application reduces the small particle size product loss rate of the calcium carbonate product.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of industrial automation control, and in particular to a calcium carbonate grinding control method, a calcium carbonate grinding machine, a product and a medium. BACKGROUND

[0002] With the development of industrial technology, the calcium carbonate grinding machine is a key equipment in many industries. It can finely grind calcium carbonate, which is used in the building materials industry to produce high-quality materials, in the plastic and rubber industry to improve product performance, and in the paper industry to improve paper quality, meeting the requirements of different industries for calcium carbonate particle size and quality.

[0003] At present, the overall working process of the calcium carbonate grinding machine is that the raw material enters the main machine from the feeder, the grinding medium in the main machine impacts and rubs the calcium carbonate particles, and the qualified powder after grinding is attracted to the filtering device by negative pressure. The air speed is adjusted by the air valve control system during the whole process to achieve fine grinding of calcium carbonate.

[0004] However, during the operation of the grinding machine, if the negative pressure is too small due to pipe blockage or blockage at the filtering device, the air valve will be adjusted to increase the air speed and increase the negative pressure. In this process, increasing the air speed may cause fine powder to be lost; if the negative pressure is too large due to blockage of the ventilation pipe or the air outlet, the air valve will be adjusted to reduce the air speed and reduce the negative pressure. In this process, reducing the air speed may cause fine powder to be unable to be transported to the collection area of the filtering device, thereby increasing the loss rate of small particle size finished products of calcium carbonate. SUMMARY

[0005] The present application provides a calcium carbonate grinding control method, a calcium carbonate grinding machine, a product and a medium for reducing the loss rate of small particle size finished products of calcium carbonate.

[0006] In a first aspect, the present application provides a calcium carbonate grinding control method, comprising:

[0007] After the calcium carbonate grinder starts to run, the internal and external pressure values of the filtering device are monitored in real time by the pressure sensor to obtain the internal pressure value, the external pressure value and the internal-external pressure difference; when the internal-external pressure difference reaches a preset pressure difference early warning threshold, the opening of the air valve is adjusted to increase the air speed in the filtering device; when the internal-external pressure difference does not reach the preset pressure difference early warning threshold, the particle size distribution at the inlet of the filtering device is monitored to obtain a real-time small particle size product rate; the air valve opening adjustment amount is calculated according to the real-time pressure difference, the preset optimal pressure difference, the preset optimal small particle size product rate and the real-time small particle size product rate; the calculation of the air valve opening adjustment amount is that the pressure difference air valve opening adjustment amount is calculated according to the real-time pressure difference and the preset optimal pressure difference, the small particle size rate air valve opening adjustment amount is calculated according to the preset optimal small particle size product rate and the real-time small particle size product rate, then the product of the pressure difference air valve opening adjustment amount and a preset first coefficient and the product of the small particle size rate air valve opening adjustment amount and a preset second weighting coefficient are calculated, and the difference between the two products is obtained to obtain the air valve opening adjustment amount; the opening of the air valve is adjusted in real time according to the air valve opening adjustment amount to obtain the latest air valve opening.

[0008] In the above embodiment, by monitoring the pressure difference of the filtering device in real time and adjusting the opening of the air valve according to the pressure difference, the system can respond to abnormal pressure conditions in time to ensure stable air pressure in the filtering device and normal material conveying; when the pressure difference does not reach the early warning threshold, the particle size distribution is monitored, and the opening of the air valve is adjusted according to multiple parameters to accurately control the air valve, which not only ensures that the pressure difference is maintained within a reasonable range to stabilize the system operation, but also optimizes the adjustment according to the small particle size product rate to reduce the loss rate of the small particle size product of the calcium carbonate product.

[0009] In combination with some embodiments of the first aspect, in some embodiments, after the calcium carbonate grinder starts to run, the internal and external pressure values of the filtering device are monitored in real time by the pressure sensor to obtain the internal pressure value, the external pressure value and the internal-external pressure difference, and the method further comprises:

[0010] At preset time intervals, the internal pressure value is recorded at the end of each preset time interval; after the latest internal pressure value is recorded, the latest internal pressure value change rate is calculated; when the latest internal pressure value change rate exceeds a preset internal pressure value change rate range threshold, the amplitude of the vibration motor of the raw material bin is adjusted according to the latest amplitude adjustment rate.

[0011] In the above embodiment, by monitoring the internal pressure in real time and calculating the change rate thereof, the system can sensitively capture the dynamic change trend of the pressure; when the internal pressure value change rate exceeds the preset range, the amplitude adjustment rate is determined according to the change rate and a preset coefficient, and the amplitude of the vibration motor is adjusted, so as to accurately control the speed of the raw material entering the main machine and ensure the continuity, coordination and smooth and efficient operation of the entire grinding process of the calcium carbonate grinder.

[0012] In some embodiments of the first aspect, when the latest internal pressure value rate of change exceeds the preset internal pressure value rate of change range threshold, the adjusting the amplitude of the vibration motor of the raw material bin according to the latest amplitude adjustment rate further comprises, in some embodiments:

[0013] The raw material yield rate is calculated based on the real-time powder flow rate and the raw material flow rate. When the raw material yield rate is lower than the preset minimum raw material yield rate threshold, the calcium carbonate grinding machine is controlled to extend the grinding time.

[0014] In the above embodiments, the raw material yield rate is calculated by monitoring the raw material flow rate and the real-time powder flow rate at the outlet of the filtering device, which allows accurate control of the production efficiency of the grinding machine. When the raw material yield rate is lower than the preset threshold, the grinding time is extended by controlling the grinding machine, thereby ensuring that more raw materials are fully ground into qualified products, effectively improving the utilization rate of calcium carbonate raw materials, reducing raw material waste, and improving the economic efficiency and product output quality of the entire grinding process.

[0015] In some embodiments of the first aspect, when the internal-external pressure difference reaches the preset pressure difference warning threshold, the opening of the air valve is adjusted to increase the air speed in the filtering device, which specifically comprises:

[0016] When the internal-external pressure difference reaches the preset pressure difference warning threshold, it is determined whether the internal pressure value is greater than the external pressure value. When the internal pressure value is greater than the external pressure value, the opening of the air valve is increased to increase the air speed in the filtering device. When the internal pressure value is not greater than the external pressure value, the opening of the air valve is decreased to decrease the air speed in the filtering device.

[0017] In the above embodiments, the opening of the air valve is adjusted based on the internal-external pressure difference of the filtering device and the relationship between the internal pressure and the external pressure, allowing the system to accurately control the air speed in the filtering device based on the specific pressure conditions. When the internal pressure is too high, increasing the air speed can quickly balance the pressure difference and prevent equipment damage or material abnormalities caused by excessive pressure. When the internal pressure is not high, decreasing the air speed can avoid excessive suction, ensuring stable settling and normal collection of materials in the filtering device and maintaining stable operation of the entire grinding machine system.

[0018] In some embodiments of the first aspect, according to the real-time pressure difference, the preset optimal pressure difference, the preset optimal small-particle-size product rate, and the real-time small-particle-size product rate, the air valve opening degree adjustment amount is calculated, specifically comprising: according to the real-time pressure difference, the preset optimal pressure difference, the preset proportional coefficient, the preset integral coefficient, the preset differential coefficient, the pressure deviation value, the real-time small-particle-size product rate, the preset optimal small-particle-size product rate, the first weighting coefficient, the second weighting coefficient, and the first formula, the air valve opening degree adjustment amount is calculated; wherein the first formula is:

[0019]

[0020] wherein u(t) is the air valve opening degree adjustment amount, w1 is the first weighting coefficient, w2 is the second weighting coefficient, the pressure difference air valve opening degree adjustment amount K p is the preset proportional coefficient, K i is the preset integral coefficient, K d is the preset differential coefficient, the pressure deviation value e(t) = |F1-F2|, F1 is the preset optimal pressure difference, F2 is the real-time pressure difference, the small-particle-size rate air valve opening degree adjustment amount u2(t) = R-R1, R is the real-time small-particle-size product rate, and R1 is the preset optimal small-particle-size product rate.

[0021] In the above embodiments, by comprehensively considering the real-time pressure difference and the preset optimal pressure difference, the real-time small-particle-size product rate and the preset optimal small-particle-size product rate, the air valve opening degree adjustment amount is accurately calculated, so that the air valve adjustment can take into account the pressure control and the product particle size quality control, and the influence of different factors is integrated according to the preset coefficient weighting, so that the air valve opening degree regulation is more scientific and reasonable, effectively maintaining the system pressure stability while reducing the small-particle-size product loss rate of the calcium carbonate product.

[0022] In some embodiments of the first aspect, after the air valve opening degree is adjusted in real time to the latest air valve opening degree according to the air valve opening degree adjustment amount, the method further comprises:

[0023] detecting the humidity inside the calcium carbonate grinding machine in real time to obtain a real-time humidity value; in the case that the real-time humidity value is greater than a preset maximum humidity value threshold, adjusting the latest air valve opening degree according to a high-humidity air valve opening degree adjustment amount; the high-humidity air valve opening degree adjustment amount is the difference between the real-time humidity value and the preset maximum humidity value threshold.

[0024] In the above embodiments, by monitoring the humidity inside the calcium carbonate grinding machine in real time and comparing it with the preset threshold, when the humidity is out of limit, the air valve opening degree is adjusted according to the high-humidity air valve opening degree adjustment amount determined by the humidity difference, so that the system can be timely regulated according to the humidity condition. This can effectively prevent problems such as material sticking caused by high humidity, and ensure the smooth progress of the calcium carbonate grinding process.

[0025] In some embodiments of the first aspect, in some embodiments, after the air valve opening degree is adjusted in real time according to the air valve opening degree adjustment amount to the latest air valve opening degree, the method further comprises:

[0026] After detecting that the user issues an instruction to stop the operation of the calcium carbonate grinder, the vibration motor of the raw material bin is controlled to stop vibrating; after detecting that the discharge port stops discharging, the calcium carbonate grinder is gradually reduced in speed until it stops, and the air valve opening degree is gradually reduced until it closes.

[0027] In the above embodiments, by controlling the vibration motor of the raw material bin to stop vibrating after detecting the stop operation, waste or clogging caused by the raw material continuously entering the grinder is avoided; after the discharge port stops discharging, the calcium carbonate grinder is gradually reduced in speed and the air valve opening degree is gradually reduced until it completely stops and closes, so that the grinder can stop running smoothly and orderly, reducing the wear and impact caused by sudden stop of the equipment, prolonging the service life of the equipment, and ensuring that the material processing in the system is completed.

[0028] In a second aspect, the embodiments of the present application provide a calcium carbonate grinder, comprising one or more processors and a memory; the memory is coupled to the one or more processors, and the memory is used to store computer program codes, the computer program codes comprising computer instructions, and the one or more processors invoke the computer instructions to enable the calcium carbonate grinder to perform the method described in the first aspect and any possible implementation manner of the first aspect.

[0029] In a third aspect, the embodiments of the present application provide a computer program product comprising instructions, when the computer program product is executed on a calcium carbonate grinder, the calcium carbonate grinder performs the method described in the first aspect and any possible implementation manner of the first aspect.

[0030] In a fourth aspect, the embodiments of the present application provide a computer readable storage medium comprising instructions, when the instructions are executed on a calcium carbonate grinder, the calcium carbonate grinder performs the method described in the first aspect and any possible implementation manner of the first aspect.

[0031] It can be understood that the calcium carbonate grinder provided in the second aspect, the computer program product provided in the third aspect, and the computer storage medium provided in the fourth aspect are all used to perform the calcium carbonate grinding control method provided in the embodiments of the present application. Therefore, the beneficial effects that can be achieved are referred to the beneficial effects in the corresponding method, which will not be described here.

[0032] The one or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0033] 1、The application adjusts the opening degree of the air valve by monitoring the pressure difference of the filtering device in real time, so that the system can respond to abnormal pressure conditions in time, ensuring stable air pressure in the filtering device and normal material conveying; when the pressure difference does not reach the warning threshold, the particle size distribution is monitored, and the air valve opening degree adjustment amount is calculated combined with multiple parameters, so that the air valve can be accurately controlled, ensuring that the pressure difference is maintained within a reasonable range to stabilize system operation, and also optimizing adjustment according to the small particle size product rate to reduce the small particle size product loss rate of calcium carbonate products.

[0034] 2、The application accurately calculates the air valve opening degree adjustment amount by comprehensively considering the real-time pressure difference and the preset optimal pressure difference, the real-time small particle size product rate and the preset optimal small particle size product rate, so that the air valve adjustment can consider pressure control and product particle size quality control, and the influence of different factors is weighted and integrated according to the preset coefficient, making the air valve opening degree adjustment more scientific and reasonable, effectively maintaining system pressure stability while reducing the small particle size product loss rate of calcium carbonate products.

[0035] 3、The application first controls the raw material bin vibration motor to stop vibrating after detecting the user's stop operation instruction, to avoid waste or blockage caused by the raw material continuing to enter the grinding machine; after the discharge port stops discharging, gradually reduce the calcium carbonate grinder speed and air valve opening degree until completely stop and close, so that the grinding machine can stop running smoothly and orderly, reduce the wear and impact caused by equipment emergency stop, prolong the service life of the equipment, and at the same time ensure that the material processing in the system is completed. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 is an exemplary application scenario schematic diagram of the calcium carbonate grinding control method in the embodiments of the application;

[0037] Figure 2 is a flowchart of the calcium carbonate grinding control method in the embodiments of the application;

[0038] Figure 3 is another flowchart of the calcium carbonate grinding control method in the embodiments of the application;

[0039] Figure 4 is an exemplary hardware structure schematic diagram of the calcium carbonate grinder in the embodiments of the application. DETAILED DESCRIPTION

[0040] The terminology used in the following embodiments of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. As used in the description of the embodiments of the application and the appended claims, the singular forms "a," "an" and "the" are intended to include both singular and plural forms, unless the context clearly indicates otherwise. It will be further understood that the terms "and / or," as used in the description of the embodiments of the application, refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0041] Hereinafter, the terms "first", "second" are only for the purpose of description, and cannot be understood as implying or suggesting relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features, and in the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise specified.

[0042] Figure 1 is an exemplary application scenario diagram of the calcium carbonate grinding control method in the embodiments of the present application.

[0043] Please refer to Figure 1 , the application scenario includes a raw material bin 110, a main machine 120, a filter 130 and a ventilator 140.

[0044] The raw material bin 110 is a part for storing calcium carbonate raw materials, which is responsible for providing calcium carbonate raw materials after the calcium carbonate grinding machine starts running. Among them, the feeder 111 is used to store and control the output of raw materials; the vibration motor 112 makes the raw materials enter the main machine according to the predetermined flow by generating vibration, providing the basis for the subsequent grinding process.

[0045] The main machine 120 is the core part of calcium carbonate grinding, which grinds calcium carbonate raw materials and distinguishes qualified products. Among them, the grinding chamber 121 is used to grind the calcium carbonate raw materials entering from the raw material bin, and to crush and refine them; the classifier 122 can screen the ground raw materials according to the particle size, separate the qualified and unqualified products by the action principle of centrifugal force, airflow, etc., and the qualified products enter the filter, and the unqualified large particle calcium carbonate raw materials remain in the main machine for further grinding.

[0046] The filter 130 is mainly used for filtering and collecting the ground calcium carbonate products. The bag structure 131 plays a role in separating solid particles and gas, and can block the calcium carbonate products, so that air passes through. Under the continuous action of airflow, the calcium carbonate products settle and are discharged through the discharge device 132, so as to obtain pure calcium carbonate products.

[0047] The structure for separating solid particles from gas can be, but is not limited to, a cloth bag structure, filter paper, filter screen, etc., which can effectively block calcium carbonate product particles and allow air to pass through.

[0048] The ventilator 140 mainly provides air flow power for the whole system, the fan 142 generates air flow, and the air valve 141 is used to control the size of the air inlet, so as to adjust the air speed in the system and ensure the normal operation of the filtering work.

[0049] The calcium carbonate grinding control method in an embodiment of the present application is described below:

[0050] Please refer to Figure 2 A flowchart of the calcium carbonate grinding control method provided in the embodiment of the present application is shown in the figure, and the method can be applied to Figure 1 The application scenario shown in the figure includes the following steps:

[0051] S201, after the calcium carbonate grinding machine starts to operate, the internal and external pressure values of the filtering device are monitored in real time by a pressure sensor to obtain the internal pressure value, the external pressure value, and the internal-external pressure difference;

[0052] It can be understood that the internal-external pressure difference is the difference between the external pressure value and the internal pressure value.

[0053] The pressure sensor is installed at the corresponding positions inside and outside the filtering device, and during the operation of the calcium carbonate grinding machine, the sensor generates corresponding electrical signal changes according to the pressure effect. These signals are transmitted to the calcium carbonate grinding machine control system. The control system processes and converts the signals through a specific algorithm, thereby accurately obtaining the internal pressure value and the external pressure value of the filtering device, and further calculating the difference between the two, i.e., the internal-external pressure difference.

[0054] By monitoring the internal-external pressure values and the pressure difference of the filtering device in real time, the system can timely and accurately grasp the air flow and material state in the filtering device, which helps to find abnormal pressure conditions in advance, provides a basis for adjusting the air valve opening degree and other operations, ensures stable and efficient filtering process, prevents problems such as material flying loss, equipment wear and tear, and poor filtering effect caused by pressure imbalance, and improves the overall operation reliability of the calcium carbonate grinding machine and product quality.

[0055] S202, detecting whether the real-time pressure difference reaches a preset pressure difference threshold value;

[0056] If the real-time internal-external pressure difference reaches the preset pressure difference warning threshold value, the following step S203 is performed;

[0057] If the real-time internal-external pressure difference does not reach the preset pressure difference warning threshold value, the following step S204 is performed;

[0058] It can be understood that the preset pressure difference early warning threshold is the maximum value of the internal and external pressure difference that the filter device can reach under the normal running state of the calcium carbonate grinding machine. If the internal and external pressure values of the calcium carbonate grinding machine reach the preset pressure difference early warning threshold, it is judged that the running state of the calcium carbonate grinding machine is abnormal, and the internal and external pressure difference needs to be adjusted in time to be less than the preset pressure difference early warning threshold.

[0059] The internal and external pressure difference data continuously acquired by the pressure sensor is compared with the preset threshold value. When the pressure difference reaches the early warning threshold value, step S203 is executed, and the control system increases the opening degree of the air valve according to the set strategy to increase the air inlet amount to increase the air speed. If the pressure difference does not reach the early warning threshold value, step S204 is executed, and the opening degree of the air valve is adjusted through subsequent steps.

[0060] By intelligently controlling the air valve according to the pressure difference, the equipment can automatically adjust the filtering air speed when the pressure difference is too large, which can avoid damage to the equipment due to abnormal pressure and ensure stable operation of the system.

[0061] S203, increase the air speed in the filter device by adjusting the opening degree of the air valve;

[0062] When the system determines that the air speed in the filter device needs to be increased, a control signal will be sent to the air valve. The air valve is usually driven by a motor or a pneumatic device. After receiving the signal, the motor rotates or the pneumatic device acts, so that the opening degree of the air valve increases, thereby reducing the resistance of the air valve to the airflow. The airflow generated by the fan increases in flow when passing through the air valve, thereby increasing the air speed into the filter device.

[0063] By adjusting the opening degree of the air valve to increase the air speed in the filter device, the air pressure distribution in the filter device is changed, which is beneficial to more efficiently shake off the calcium carbonate products adsorbed on the filter bag, prevent the filter bag from being blocked, prolong the service life of the filter bag, and also speed up the separation speed of air and products, improve the working efficiency of the filter device, and ensure the smooth operation of the overall production process of the calcium carbonate grinding machine.

[0064] S204, monitor the particle size distribution at the inlet of the filter device to obtain the real-time small particle size product rate;

[0065] It can be understood that the small particle size product rate is the ratio of the number of small particle size calcium carbonate products whose particle size is less than the preset small particle size threshold value to the total number of calcium carbonate products in the filter device.

[0066] A particle size detection instrument is installed at the inlet of the filtering device. When the calcium carbonate product flows through the inlet, the instrument emits laser to irradiate the particles. By detecting the intensity and angle of the scattered light, and according to a specific algorithm and an established database, particles of different sizes are identified and counted, and the proportion of the small particle size calcium carbonate product whose particle size is less than a preset small particle size threshold in the total product is calculated, that is, the real-time small particle size product rate.

[0067] In some embodiments of the present application, the particle size detection instrument can be a laser particle size analyzer. Based on the principle of light scattering, when a laser beam irradiates a group of particles, scattering will occur. The size of the particles is different, and the intensity and angle distribution of the scattered light are also different. By measuring these characteristics of the scattered light, using an optical model, and through complex mathematical calculations and algorithm processing, the particle size distribution information of the particles can be obtained. In other embodiments of the present application, the particle size detection instrument can also be a sieve method particle size detector, etc. A series of sieves with different apertures are used. The particle sample is placed on the uppermost sieve, and the particles are moved on the sieve by vibration or other mechanical means. Smaller particles will fall through the sieve, while larger particles will remain on the sieve. By analyzing the weight or number of particles remaining on each sieve, the particle size distribution of the particles can be determined, which is not limited here.

[0068] By monitoring the particle size distribution at the inlet of the filtering device, the real-time small particle size product rate can be obtained, so that the proportion of small particle size products in the calcium carbonate product can be grasped in time. Subsequently, the small particle size product rate can be adjusted together when adjusting the air speed in the calcium carbonate grinding machine, which can reduce the loss rate of small particle size products in the calcium carbonate product.

[0069] S205, calculating the air valve opening adjustment amount according to the real-time pressure difference, the preset optimal pressure difference, the preset optimal small particle size product rate, and the real-time small particle size product rate;

[0070] Specifically, the air valve opening adjustment amount is calculated according to the pressure difference air valve opening adjustment amount calculated from the real-time pressure difference and the preset optimal pressure difference, the small particle size rate air valve opening adjustment amount calculated from the preset optimal small particle size product rate and the real-time small particle size product rate, and the difference between the product of the pressure difference air valve opening adjustment amount and the preset first coefficient and the product of the small particle size rate air valve opening adjustment amount and the preset second weighting coefficient.

[0071] By comprehensively calculating the air valve opening adjustment amount based on multiple parameters, the air valve adjustment can take into account both system pressure stability and product quality optimization, avoiding the one-sidedness caused by adjusting only the pressure factor, avoiding the loss or inability to collect small particle size products during air speed adjustment, accurately controlling the air speed, improving the operation stability of the calcium carbonate grinding machine, and improving product quality and production efficiency, adapting to different working conditions.

[0072] S206. Adjust the damper opening to the latest damper opening in real time according to the damper opening adjustment amount.

[0073] The control system receives the calculated valve opening adjustment data and converts it into an electrical signal command. If it is an electric valve, the command drives the motor to rotate forward or backward, and precisely changes the rotation angle of the valve blades through the transmission device to adjust the opening. If it is a pneumatic valve, the control system adjusts the air pressure of the pneumatic actuator to actuate the valve components, thereby setting the valve opening to the latest calculated value.

[0074] By adjusting the air valve opening in real time based on calculation results, the airflow velocity within the filtration device can quickly adapt to the production process requirements. This effectively ensures that the pressure remains stable within a reasonable range, preventing pressure fluctuations from affecting the grinding and filtration effects. Simultaneously, it reduces material waste based on the yield of small-diameter finished products, improving the overall accuracy, efficiency, and stability of the calcium carbonate grinding mill.

[0075] In the above embodiments, by monitoring the pressure difference of the filtration device in real time and adjusting the opening of the air valve accordingly, the system can respond to pressure anomalies in a timely manner, ensuring stable air pressure and normal material conveying within the filtration device. When the pressure difference does not reach the warning threshold, the particle size distribution is monitored, and the air valve opening adjustment amount is calculated in combination with multiple parameters, so that the air valve can be precisely controlled. This ensures that the pressure difference is maintained within a reasonable range to stabilize system operation, and can also be optimized and adjusted according to the small particle size finished product rate to reduce the small particle size finished product loss rate of calcium carbonate.

[0076] In some embodiments, special situations may arise during the calcium carbonate grinding control process. For example, when the humidity inside the calcium carbonate grinder is high, the finished calcium carbonate product may clump together, easily clogging the air vents inside the filter device. In such cases, the calcium carbonate grinding control method can adjust the air valve opening to regulate the airflow based on the humidity inside the calcium carbonate grinder, thereby reducing the humidity. Figure 3 The diagram shown is another flowchart illustrating a sensor anomaly detection method provided in this application. This method can be used for... Figure 1 The application scenario shown includes the following steps:

[0077] S301. After the calcium carbonate grinding mill starts running, the internal and external pressure values ​​of the filter device are monitored in real time by a pressure sensor to obtain the internal pressure value, external pressure value and internal and external pressure difference.

[0078] S302. Record the internal pressure value at the end of each preset time interval.

[0079] A fixed time interval is preset, for example, every 5 minutes as an interval, when the calcium carbonate grinding machine is running, the timing device starts to work, and when reaching the end point of each preset time interval, the data acquisition module connected with the pressure sensor will obtain the internal pressure value of the filter device measured by the pressure sensor at this time, and record and store it in a specific data storage area, so as to be called and analyzed subsequently.

[0080] By recording the internal pressure value at preset time intervals, the internal pressure change of the filter device can be monitored and data stored periodically, which helps to analyze the change trend of pressure over time, discover abnormal pressure fluctuation in time, and early warn possible equipment failure or process problems, and ensure the stable operation of the calcium carbonate grinding machine.

[0081] S303、After recording the latest internal pressure value, the change rate of the latest internal pressure value is calculated;

[0082] It can be understood that when the latest internal pressure value is obtained, the internal pressure value recorded in the previous time interval is called from the data storage area, the difference between the two is obtained, and the difference value is obtained; then the difference value is divided by the preset time interval length, and the change rate of the latest internal pressure value is obtained.

[0083] By calculating the change rate of the latest internal pressure value, the dynamic change characteristics of the pressure can be accurately quantified.

[0084] S304、When the change rate of the latest internal pressure value exceeds the preset internal pressure value change rate range threshold, the amplitude of the vibration motor of the raw material bin is adjusted according to the latest amplitude adjustment rate;

[0085] It can be understood that the latest amplitude adjustment rate is a multiple value of the latest internal pressure value change rate and a preset amplitude adjustment proportion coefficient.

[0086] When the change rate of the latest internal pressure value exceeds the threshold, the system calculates the latest amplitude adjustment rate according to the preset amplitude adjustment proportion coefficient and the change rate, and then sends an instruction to the controller of the raw material bin vibration motor. The controller changes the output current or voltage according to the adjustment rate, so as to accurately adjust the amplitude of the vibration motor and change the raw material feeding speed.

[0087] By adjusting the amplitude of the vibration motor according to the pressure change rate, the raw material feeding amount of the raw material bin can be adjusted according to the dynamic change of the internal pressure of the grinding machine, so as to avoid the pressure imbalance caused by excessive or insufficient feeding, maintain the stable operation of the system, prevent material blockage or equipment idling, improve the efficiency and quality of calcium carbonate grinding, prolong the service life of the equipment, and reduce energy consumption and material loss.

[0088] S305、Real-time monitoring of the raw material feeding flow value of the raw material bin, calculating the raw material yield rate through the real-time powder flow value and the raw material feeding flow value;

[0089] It can be understood that the raw material yield is a proportional value of the real-time powder flow value and the raw material discharge flow value.

[0090] Flow monitoring devices are arranged at the discharge port of the raw material bin and the subsequent finished product collection place respectively, and the raw material discharge flow value and the real-time powder flow value formed after grinding are obtained in real time. Through division operation, i.e. the real-time powder flow value divided by the raw material discharge flow value, the proportion of the two is obtained, which is the raw material yield.

[0091] By calculating the raw material yield, the efficiency of converting the raw material into qualified finished products during the calcium carbonate grinding process can be intuitively mastered, and problems that may exist in the grinding process, such as insufficient grinding or raw material waste, can be found in time, so that the grinding process can be optimized, the raw material utilization rate can be improved, the production cost can be reduced, and the product quality can be ensured S306, in the case that the raw material yield is lower than the preset minimum raw material yield threshold, the calcium carbonate grinding machine is controlled to prolong the grinding time;

[0092] When the monitored raw material yield is lower than the preset threshold, the control system sends an instruction to the main machine of the calcium carbonate grinding machine, so that the running time of the grinding components in the main machine is prolonged on the basis of the original setting. By changing the running program of the main machine or the parameter setting of the control elements such as time relays, the prolongation of the grinding time is realized, and the raw material is allowed to receive more sufficient grinding effect in the grinding chamber.

[0093] By prolonging the grinding time, the raw material that is not sufficiently ground has more opportunities to be refined, the proportion of the raw material converted into qualified finished products is improved, which helps to improve the product quality, reduce the waste of raw materials due to low yield, and reduce the production cost to a certain extent.

[0094] S307, detecting whether the real-time pressure difference reaches the preset pressure difference threshold;

[0095] If the real-time internal and external pressure difference reaches the preset pressure difference warning threshold, the following step S308 is executed;

[0096] If the real-time internal and external pressure difference does not reach the preset pressure difference warning threshold, the following step S311 is executed;

[0097] S308, judging whether the internal pressure value is greater than the external pressure value;

[0098] If the internal pressure value is greater than the external pressure value, the following step S309 is executed;

[0099] If the internal pressure value is not greater than the external pressure value, the following step S310 is executed;

[0100] The system obtains the internal and external pressure values of the filtering device through the pressure sensor and compares them. If the internal pressure is greater, the following step S309 is performed, a signal is sent to the air valve actuator to increase the opening degree, so that more air flow enters and the air speed increases; if the internal pressure is not greater than the external pressure, the following step S310 is performed, a signal is sent to the air valve actuator to reduce the opening degree, so that the air intake is reduced and the air speed is reduced, thereby adjusting the air speed.

[0101] By adjusting the air valve opening degree according to the pressure difference to change the air speed, the air pressure balance in the filtering device is effectively controlled. Problems such as reduced filtering efficiency, material leakage or equipment damage caused by abnormal air pressure difference are prevented, the stable operation of the calcium carbonate grinding machine in the filtering link is ensured, the product quality and production safety are improved, and the equipment maintenance cost and failure risk are reduced.

[0102] S309, increasing the air speed of the filtering device by increasing the opening degree of the air valve;

[0103] When it is determined that the air speed of the filtering device needs to be increased, an instruction is sent to the air valve. After receiving the instruction, the electric or pneumatic driving device of the air valve acts to increase the opening degree of the air valve. After the opening degree of the air valve is increased, the resistance to the air flow generated by the ventilator is reduced, and more air can quickly pass through the air valve into the filtering device, thereby increasing the air speed in the filtering device.

[0104] S310, reducing the air speed of the filtering device by reducing the opening degree of the air valve;

[0105] When it is determined that the internal pressure value is not greater than the external pressure value and the air speed of the filtering device needs to be reduced, the control system will issue an instruction. The instruction is transmitted to the driving mechanism of the air valve. If it is an electric air valve, the motor is reversed to drive the blades of the air valve to rotate and reduce the opening between the blades. If it is a pneumatic air valve, the air pressure is changed to make the adjusting part of the air valve act, reduce the passage area, and reduce the air flow through the air valve, thereby achieving the purpose of reducing the air speed of the filtering device.

[0106] S311, monitoring the particle size distribution at the inlet of the filtering device to obtain the real-time small particle size product rate;

[0107] S312, calculating the air valve opening degree adjustment amount according to the real-time pressure difference, the preset optimal pressure difference, the preset optimal small particle size product rate, the real-time small particle size product rate, and the first formula;

[0108] Specifically, the first formula is:

[0109]

[0110] Wherein, u(t) is the air valve opening degree adjustment amount, w1 is the first weighting coefficient, w2 is the second weighting coefficient, and the pressure difference air valve opening degree adjustment amount Kp K is a preset proportional coefficient i K is a preset integral coefficient d K is a preset differential coefficient, the pressure deviation value e(t) = |F1-F2|, F1 is a preset optimal pressure difference, F2 is a real-time pressure difference, the small particle size rate air valve opening adjustment amount u2(t) = R-R1, R is a real-time small particle size product rate, R1 is a preset optimal small particle size product rate.

[0111] In the first formula, the air valve opening adjustment amount Based on the calculation method of the PID (Proportional-Integral-Differential) control strategy, the PID controller calculates the control amount according to the pressure difference deviation, the integral of the deviation, and the differential of the deviation. Let the pressure difference set value be F1, and the actual pressure difference (the difference between the internal pressure value and the external pressure value) be F2, then the pressure difference deviation e(t) = |F1-F2|. The proportional term directly calculates the adjustment amount according to the current deviation, the larger the deviation, the larger the adjustment amount; the integral term accumulates past deviations to eliminate the steady-state error of the system, even if the deviation is small, it can also produce enough adjustment amount with time accumulation; the differential term considers the rate of change of the deviation, when the pressure difference value changes sharply, it quickly responds to adjust, combined with the preset coefficient, the three terms are added to obtain the air valve opening adjustment amount.

[0112] By using the PID control strategy, the adjustment of the air valve opening is more accurate, timely and stable, the accuracy lies in the dynamic adjustment according to the pressure difference value and change, reducing the overshoot, the timeliness is because the differential term can quickly respond to pressure mutation, and the stability is because the integral term eliminates the steady-state error. In this way, the pressure of the filtering device can be effectively maintained stable, the working efficiency of the calcium carbonate grinding machine and the product quality can be improved, and the energy consumption and equipment wear can be reduced.

[0113] On the basis of the above steps, the small particle size rate air valve opening adjustment amount is calculated, using the real-time small particle size product rate R, subtracting the preset optimal small particle size product rate R1 to obtain the difference as the small particle size rate air valve opening adjustment amount u2(t) = R-R1. The pressure difference air valve opening adjustment amount is multiplied by the preset first weighting coefficient w1, and the small particle size rate air valve opening adjustment amount is multiplied by the preset second weighting coefficient w2. Finally, the two products are subtracted to consider the pressure and small particle size product rate factors, and the final air valve opening adjustment amount is obtained.

[0114] In this way, the air valve opening adjustment amount is calculated, so that the adjustment of the air valve can balance the pressure and the yield of small particle size products, considering both the pressure condition in the system and the quality requirement of the product, so that the air speed can be accurately controlled, effectively avoiding the situation that a large amount of small particle size products are lost when the air speed needs to be increased, and the situation that part of the small particle size products cannot be collected when the air speed needs to be reduced, thereby reducing the loss rate of small particle size products of calcium carbonate products.

[0115] S313, adjusting the air valve opening according to the air valve opening adjustment amount to obtain the latest air valve opening.

[0116] S314, detecting the humidity inside the calcium carbonate grinder in real time to obtain a real-time humidity value;

[0117] When the grinder is running, the humidity sensor inside the calcium carbonate grinder is in contact with the internal environment, and the sensitive element inside the humidity sensor will produce a corresponding physical change, such as a change in capacitance or resistance, according to the change in environmental humidity. Then, through the matching circuit, the physical change is converted into an electrical signal, and then through analog-to-digital conversion and other processing, a real-time humidity value that can be read is finally obtained.

[0118] By detecting the humidity in real time, the humidity inside the grinder can be understood in time. In the calcium carbonate grinding process, humidity may affect product quality, equipment operation and material performance. Timely grasp of humidity information can prevent problems such as material caking and equipment rusting caused by abnormal humidity. If the humidity exceeds the normal range, appropriate measures can be taken, such as starting the dehumidification equipment or adjusting the ventilation system, to ensure the stability of the internal environment of the grinder, thereby improving the product quality and the service life of the equipment.

[0119] S315, in the case that the real-time humidity value is greater than the preset maximum humidity value threshold, adjusting the latest air valve opening according to the high-humidity air valve opening adjustment amount;

[0120] It can be understood that the high-humidity air valve opening adjustment amount is the difference between the real-time humidity value and the preset maximum humidity value threshold.

[0121] When it is detected that the real-time humidity value exceeds the preset maximum humidity value threshold, the system calculates the difference between the two as the high-humidity air valve opening adjustment amount, and then adjusts the air valve opening according to the adjustment amount by controlling the driving device (such as a motor or a pneumatic element) of the air valve, so that the air valve opening is changed by the adjustment amount, such as increasing the opening to speed up the air flow and reduce the humidity.

[0122] By adjusting the air valve opening according to the humidity, the humidity inside the grinder can be effectively controlled to prevent problems such as calcium carbonate caking and equipment corrosion caused by high humidity, ensure the smooth progress of the grinding process, improve the stability of product quality, prolong the service life of the equipment, and reduce production interruptions and material losses caused by humidity factors.

[0123] S316, after detecting the user's instruction to stop the operation, the vibration motor of the raw material bin is stopped;

[0124] When the user's instruction to stop is received, a stop instruction is immediately sent to the control circuit of the raw material bin vibration motor, the control circuit cuts off the power supply of the vibration motor, the motor stops running due to the loss of power, and no longer produces vibration, thereby stopping the delivery of raw materials.

[0125] In some embodiments of the present application, the user's instruction to stop the operation can be to click the stop button on the operation panel; in other embodiments of the present application, the user's instruction to stop the operation can also be to turn off the running switch of the calcium carbonate grinding machine, etc., which is not limited here.

[0126] By stopping the vibration of the vibration motor when stopping, the raw material bin stops discharging, avoiding the entry of raw materials during the stop of the grinding machine.

[0127] S317, after detecting that the discharge port stops discharging, the speed of the calcium carbonate grinding machine is reduced until it stops, and the opening of the air valve is reduced until it is closed.

[0128] When the sensor detects that the discharge port stops discharging, the control system sends signals to the motor of the calcium carbonate grinding machine and the air valve respectively. After receiving the signal, the motor gradually reduces the driving current or voltage, so that the speed of the grinding machine gradually decreases until it completely stops; the air valve gradually reduces the opening under the action of the control signal until it is completely closed, cutting off the airflow channel.

[0129] The calcium carbonate grinding machine stops smoothly after stopping discharging, avoiding the problems of material residue, equipment impact and airflow turbulence in the pipeline caused by sudden stop, reducing material waste, reducing equipment wear and failure risk, prolonging the service life of the equipment, ensuring the normal operation of the equipment when starting next time, improving the safety and stability of the production process.

[0130] Steps S301, S307, S311, S313 are similar to steps S201, S202, S204, S206 in the embodiment shown in Figure 2 The steps S201, S202, S204, S206 in the embodiment shown in are similar to the descriptions in steps S201, S202, S204, S206, which will not be repeated here.

[0131] In the above embodiment, the internal pressure value is recorded at a preset time interval and the change rate is calculated, the raw material bin vibration motor amplitude is adjusted when the threshold is exceeded, the system stability can be maintained; the raw material yield rate is calculated by monitoring the raw material discharge flow value and the real-time powder flow value, the grinding time is prolonged when the yield rate is low to improve the product quality; the internal humidity is detected and the damper opening is adjusted according to the humidity, the abnormal humidity influence can be avoided; the vibration motor, the grinding machine and the damper are reasonably stopped when the operation is stopped, the material residue and the equipment wear are reduced. The operation stability, the product quality and the equipment service life of the calcium carbonate grinding machine are improved as a whole, the damper opening adjustment amount is calculated by considering the small particle size product yield rate and other parameters when the air speed of the calcium carbonate grinding machine is adjusted, and the small particle size product loss rate of the calcium carbonate product is reduced in the process.

[0132] The exemplary calcium carbonate grinding machine 400 provided by the embodiments of the present application will be introduced below. Figure 4 is an exemplary hardware structure schematic diagram of the calcium carbonate grinding machine 400 provided by the embodiments of the present application.

[0133] In some embodiments, the calcium carbonate grinding machine 400 includes a computer device. The computer device includes a processor, a memory and a network interface connected through a system bus. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store data. The network interface of the computer device is used to communicate with other terminals or servers outside through network connection. In some embodiments, the network interface can be a wired network interface, and in some embodiments, the network interface can also be a wireless network interface. The computer program is executed by the processor to implement the method in the embodiments of the present application.

[0134] Those skilled in the art can understand that, Figure 4 The structure shown in the figure is only a block diagram of part of the structure related to the scheme of the present application, and does not constitute a limitation on the computer device to which the scheme of the present application is applied. The specific computer device can include more or fewer components than those shown in the figure, or combine certain components, or have a different component arrangement.

[0135] The above-described embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the foregoing embodiments of the present application have been described in detail, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements for some technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

[0136] In the above embodiments, the term "when" can be interpreted as meaning "if" or "after" or "in response to determining" or "in response to detecting" depending on the context. Similarly, the phrase "on determining" or "if detecting (a stated condition or event)" can be interpreted as meaning "if determining" or "in response to determining" or "on detecting (a stated condition or event)" or "in response to detecting (a stated condition or event)" depending on the context.

[0137] In the above embodiments, all or some of the flowcharts or functions can be implemented by software, hardware, firmware or any combination thereof. When implemented by software, all or some of the flowcharts or functions can be implemented in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or some of the flowcharts or functions described in the embodiments of the present application are generated. The computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions can be transmitted from one website, computer, server or data center to another website, computer, server or data center through wired (such as coaxial cable, optical fiber, digital subscriber line) or wireless (such as infrared, wireless, microwave, etc.) manner. The computer readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. integrated with one or more available media. The available media can be magnetic media (such as floppy disk, hard disk, magnetic tape), optical media (such as DVD), or semiconductor media (such as solid state disk), etc.

[0138] A person of ordinary skill in the art can understand that all or part of the flow of the above-mentioned embodiment method can be instructed by a computer program to complete the relevant hardware, and the program can be stored in a computer readable storage medium. When the program is executed, it can include the flow of each method embodiment as described above. The aforementioned storage medium includes ROM or random storage memory RAM, magnetic disk or optical disk, and various program code storage media.

Claims

1. A calcium carbonate grinding control method characterized by, The application relates to a method for controlling a calcium carbonate grinding machine. The internal pressure value, the external pressure value and the internal-external pressure difference are obtained by monitoring the internal and external pressure values of the filtering device in real time through a pressure sensor after the calcium carbonate grinding machine starts running. The internal-external pressure difference is the difference between the external pressure value and the internal pressure value. When the internal-external pressure difference reaches a preset pressure difference early warning threshold, the opening of the air valve is adjusted to increase the air speed in the filtering device. When the internal-external pressure difference does not reach the preset pressure difference early warning threshold, the particle size distribution at the inlet of the filtering device is monitored to obtain a real-time small-particle-size product rate; the small-particle-size product rate is the ratio of the number of small-particle-size calcium carbonate products with a particle size less than a preset small-particle-size threshold to the total number of calcium carbonate products in the filtering device. The air valve opening adjustment amount is calculated according to the internal-external pressure difference, a preset optimal pressure difference, a preset proportion coefficient, a preset integral coefficient, a preset differential coefficient, a pressure deviation value, the real-time small-particle-size product rate, a preset optimal small-particle-size product rate, a first weighting coefficient, a second weighting coefficient and a first formula. The first formula is as follows: ， wherein, is the pressure difference wind valve opening adjustment amount, is the first weighting coefficient, is the second weighting coefficient, pressure difference wind valve opening adjustment amount , is the preset proportional coefficient, is the preset integral coefficient, is the preset differential coefficient, the pressure deviation value , is the preset optimal pressure difference, is the inner-outer pressure difference, the small particle size rate wind valve opening adjustment amount , is the real-time small particle size yield, is the preset optimal small particle size yield; The air valve opening is adjusted in real time according to the air valve opening adjustment amount to obtain a latest air valve opening.

2. The method of claim 1, wherein, After the internal pressure value, the external pressure value and the internal-external pressure difference are obtained by monitoring the internal and external pressure values of the filtering device in real time through a pressure sensor after the calcium carbonate grinding machine starts running, the method further comprises the following steps. The internal pressure value is recorded at the end of each preset time interval. After the latest internal pressure value is recorded, a latest internal pressure value change rate is calculated; the latest internal pressure value change rate is the ratio of the difference between a previous internal pressure value before the preset time interval of the latest internal pressure value recording time interval and the latest internal pressure value to the preset time interval. When the latest internal pressure value change rate exceeds a preset internal pressure value change rate range threshold, the amplitude of the vibration motor of the raw material bin is adjusted according to a latest amplitude adjustment rate; the latest amplitude adjustment rate is a multiple value of the latest internal pressure value change rate and a preset amplitude adjustment proportion coefficient.

3. The method of claim 2, wherein, After the latest internal pressure value change rate exceeds the preset internal pressure value change rate range threshold, the amplitude of the vibration motor of the raw material bin is adjusted according to the latest amplitude adjustment rate, the method further comprises the following steps. The raw material product rate is calculated according to the real-time powder flow value and the raw material discharging flow value; the raw material product rate is the ratio of the real-time powder flow value to the raw material discharging flow value. In the case that the raw material product rate is lower than a preset minimum raw material product rate threshold, the calcium carbonate grinding machine is controlled to prolong the grinding time.

4. The method of claim 1, wherein, When the internal-external pressure difference reaches the preset pressure difference early warning threshold, it is judged whether the internal pressure value is greater than the external pressure value. ​ In the case that the internal pressure value is greater than the external pressure value, the opening of the air valve is increased to increase the air speed of the filtering device; In the case that the internal pressure value is not greater than the external pressure value, the opening of the air valve is decreased to decrease the air speed of the filtering device.

5. The method of claim 1, wherein, After the air valve opening is adjusted in real time according to the air valve opening adjustment amount to the latest air valve opening, the method further comprises: detecting the internal humidity of the calcium carbonate grinding machine in real time to obtain a real-time humidity value; In the case that the real-time humidity value is greater than a preset maximum humidity value threshold, the latest air valve opening is adjusted according to a high-humidity air valve opening adjustment amount; the high-humidity air valve opening adjustment amount is the difference between the real-time humidity value and the preset maximum humidity value threshold.

6. The method of claim 1, wherein, After the air valve opening is adjusted in real time according to the air valve opening adjustment amount to the latest air valve opening, the method further comprises: After detecting that the user issues an instruction to stop the operation of the calcium carbonate grinding machine, the vibration motor of the raw material bin is controlled to stop vibrating; After detecting that the discharge port stops discharging, the calcium carbonate grinding machine is controlled to reduce the rotating speed until it stops, and the air valve opening is reduced until it is closed.

7. A calcium carbonate grinding mill characterized by, The calcium carbonate grinding machine comprises one or more processors and a memory; the memory is coupled to the one or more processors, the memory is used to store computer program code, the computer program code comprises computer instructions, and the one or more processors invoke the computer instructions to enable the calcium carbonate grinding machine control system to perform the method according to any one of claims 1-6.

8. A computer program product comprising instructions, characterized in that, When the computer program product is run on the calcium carbonate grinding machine control system, the calcium carbonate grinding machine control system is enabled to perform the method according to any one of claims 1-6.

9. A computer-readable storage medium comprising instructions, characterized in that, When the instructions are run on the calcium carbonate grinding machine control system, the calcium carbonate grinding machine control system is enabled to perform the method according to any one of claims 1-6.

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