Simple and effective real-time online granularity adjusting system for ball mill

Abstract

The invention relates to the technical field of ore grinding machinery, and particularly discloses a simple and effective real-time online granularity adjusting system of a ball mill, which comprises a data acquisition sensor, a central processing unit (CPU) and an execution element, the original data comprises a granularity result, the ore feeding amount of the ball mill, the water adding amount, the ore pulp concentration, the steel ball diameter, the ball adding amount and the motor current of the ball mill; the CPU is electrically connected with the data acquisition sensor, and the CPU is used for acquiring original data transmitted by the data acquisition sensor and outputting control parameters to the execution element by operating the PID operation system; the execution element comprises a water valve, an ore feeding conveyor and a valve, the water valve is used for controlling the water adding amount, the ore feeding conveyor is used for controlling the ore feeding amount of the ball mill, and the valve is used for controlling the adding amount of the steel balls.

Description

Technical Field

[0001] The present application relates to the technical field of grinding machinery, and in particular to a simple and effective real-time online particle size adjustment system for a ball mill. Background Art

[0002] For grinding operations, particle size control is very critical. Too large particle size (under-grinding) or too small particle size (over-grinding) will directly affect the processing efficiency and recovery grade of the minerals. Therefore, the ore dressing plant hopes to control the grinding particle size within the set range. However, there are many factors that affect the particle size. The concentration of the slurry, the moisture content of the ore, the amount of steel balls, and the diameter of the steel balls will all affect the grinding particle size. Therefore, the particle size control is difficult. At present, there are some particle size detection and control systems on the market, which have complex logical operations, high investment costs, and are difficult to maintain. Most of the concentrators still make extensive particle size adjustments by manually adding steel balls, changing the feed rate, changing the amount of water added, etc., which are greatly affected by human factors and have a large range of particle size fluctuations, which is not conducive to improving the recovery grade of the ore. Summary of the invention

[0003] The purpose of this application is to provide a simple and effective real-time online particle size adjustment system for a ball mill, so as to solve the problems of the particle size detection and control system in the prior art, which has complex logical operations, high investment costs, and is difficult to maintain. Most concentrators still perform extensive particle size adjustment by manually adding steel balls, changing the feed amount, changing the water addition amount, etc., which are greatly affected by human factors and have a large range of particle size fluctuations, which is not conducive to improving the grade of ore recovery.

[0004] To achieve the above purpose, the embodiment of the present application provides a simple and effective real-time online particle size adjustment system for a ball mill, including: a data acquisition sensor, a CPU central processing unit, and an actuator, wherein:

[0005] The data acquisition sensor is used to obtain raw data, which includes particle size results, ball mill feed amount, water addition amount, slurry concentration, steel ball diameter and ball addition amount, and ball mill motor current;

[0006] The CPU is electrically connected to the data acquisition sensor, and is used to obtain the original data transmitted by the data acquisition sensor, and output the control parameters to the actuator by running the PID operation system;

[0007] The actuator comprises a water valve, an ore-feeding conveyor and a valve. The water valve is used to control the amount of water added, the ore-feeding conveyor is used to control the amount of ore fed to the ball mill, and the valve is used to control the amount of steel balls added.

[0008] Optionally, the particle size result is obtained by analyzing with a laser particle size analyzer;

[0009] The slurry concentration is measured by a concentration meter;

[0010] The ball mill feed amount is measured and controlled by an electronic belt scale on the feed equipment, and the water addition amount is measured by a flow meter.

[0011] Optionally, after the particle size result is transmitted to the CPU central processing unit, it is compared with the set particle size to determine whether the ball mill is currently in an under-grinding or over-grinding state.

[0012] Optionally, outputting the control parameters to the actuator by running the PID operation system includes:

[0013] The CPU central processing unit obtains the ball mill feed amount, water addition amount, steel ball amount, and slurry concentration in real time, and obtains the functional relationship between the slurry particle size distribution and each control parameter by using the PID operation system and the operation formula:

[0014]

[0015] Wherein, Kp represents proportional gain, Kp is inversely related to proportionality, Tt represents integral time constant, TD represents differential time constant, u(t) represents the output control parameter, and e(t) represents the difference between the set value r(t) including the set granularity and the measured value of the original data.

[0016] Optionally, when it is determined that the ball mill is in an under-grinding state, the CPU central processing unit outputs the control parameters according to the calculation results of the PID calculation system, adjusts the speed of the feeding conveyor, reduces the ore feeding amount of the ball mill, increases the water valve opening, increases the water supply, and monitors the changes in the slurry particle size and concentration in real time.

[0017] Optionally, when it is determined that the ball mill is in an over-grinding state, the CPU central processing unit outputs the control parameters according to the calculation results of the PID calculation system, adjusts the speed of the feeding conveyor, increases the ore feeding amount of the ball mill, reduces the water valve opening, reduces the water feeding amount, and monitors the changes in the slurry particle size and concentration in real time.

[0018] Optionally, the CPU central processing unit calculates the number of additional steel balls according to the wear rate of the steel balls in the ball mill, outputs the control parameters, and controls the valve to add steel balls.

[0019] Optionally, when seasonal changes affect the moisture content of the raw ore, the control parameters are output by the CPU central processing unit to control the water valve to adjust the amount of water added to ensure that the slurry concentration meets the set requirements.

[0020] Optionally, by analyzing and counting the raw data acquired in real time, the grinding effects under different conditions are compared to find out the best control parameter range.

[0021] The embodiments of the present application have the following advantages:

[0022] Compared with the prior art, the above technical solution provides a simple and effective real-time online particle size adjustment system for a ball mill, which detects some front-end and back-end parameters, performs PID calculations, and uses a CPU central processing unit for control to achieve online automatic adjustment of the grinding particle size and stabilize the grinding particle size within a set range. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the implementation methods of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings described below are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0024] Figure 1 A ball mill grinding process diagram of a simple and effective ball mill real-time online particle size adjustment system provided by at least one embodiment of the present application;

[0025] Figure 2 A schematic diagram of a control method for a simple and effective real-time online particle size adjustment system for a ball mill is provided for at least one embodiment of the present application. DETAILED DESCRIPTION

[0026] The following is a description of the implementation of the present application by specific specific embodiments. People familiar with the technology can easily understand other advantages and effects of the present application from the contents disclosed in this specification. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0027] In the description of the present application, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "set", "install", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0028] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0029] The present invention provides a simple and effective real-time online particle size adjustment system for a ball mill. Figure 1 to Figure 2 , including: data acquisition sensor, CPU central processing unit, and actuator, among which,

[0030] The data acquisition sensor is used to obtain raw data, which includes particle size results, ball mill feed amount, water addition amount, slurry concentration, steel ball diameter and ball addition amount, and ball mill motor current;

[0031] The CPU is electrically connected to the data acquisition sensor, and is used to obtain the original data transmitted by the data acquisition sensor, and output the control parameters to the actuator by running the PID operation system;

[0032] The actuator comprises a water valve, an ore-feeding conveyor and a valve. The water valve is used to control the amount of water added, the ore-feeding conveyor is used to control the amount of ore fed to the ball mill, and the valve is used to control the amount of steel balls added.

[0033] In some embodiments, reference Figure 1 , the feed amount = the amount of reflux slurry + the amount of new ore.

[0034] Specifically, as attached Figure 1 As shown, the materials added to the ball mill include steel balls, minerals and water. The minerals are discharged after being ground in the ball mill, and the coarse particles of the minerals return to the ball mill to continue to be ground until they meet the particle size requirements.

[0035] In some embodiments, the particle size results are obtained by analysis with a laser particle size analyzer.

[0036] In some embodiments, the slurry concentration is measured by a concentration meter.

[0037] In some embodiments, the ball mill feed amount is measured and controlled by an electronic belt scale on the feeding equipment, and the water addition amount is measured by a flow meter.

[0038] Specifically, refer to Figure 2 , sampling is taken from the slurry pool at the outlet of the ball mill, and the particle size results are obtained by particle size analysis using a laser particle size analyzer. The slurry concentration is measured using a concentration meter, and the particle size results and slurry concentration results are transmitted to the CPU central processing unit through the Internet of Things. Through the PID operation system, control parameters are output to control the ball mill feed, water addition, steel ball addition, etc., to achieve online automatic adjustment of the ball mill particle size, so that the particle size is basically stable within the set range.

[0039] In some embodiments, reference Figure 2 After the particle size result analyzed by the laser particle size analyzer is transmitted to the CPU central processing unit through the Internet of Things, it is compared with the set particle size to determine whether the ball mill is currently in an under-grinding or over-grinding state.

[0040] Specifically, the under-grinding state means that the particle size of the discharged material is too large, and the over-grinding state means that the particle size of the discharged material is too small.

[0041] In some embodiments, the outputting of control parameters to the actuator by running the PID operation system includes:

[0042] The CPU central processing unit obtains the ball mill feed amount, water addition amount, steel ball amount, and slurry concentration in real time, and obtains the functional relationship between the slurry particle size distribution and each control parameter by using the PID operation system and the operation formula:

[0043]

[0044] Wherein, Kp represents proportional gain, Kp is inversely related to proportionality, Tt represents integral time constant, TD represents differential time constant, u(t) represents the output control parameter, and e(t) represents the difference between the set value r(t) including the set granularity and the measured value of the original data.

[0045] In some embodiments, when it is determined that the ball mill is in an under-grinding state, that is, the discharge particle size is too large, the reasons may be that the ball mill feeds too much ore, the water addition is insufficient, the slurry concentration is high, etc. The CPU central processing unit outputs the control parameters according to the calculation results of the PID calculation system, adjusts the speed of the feeding conveyor, reduces the ore feed of the ball mill, increases the water valve opening, increases the water supply, and monitors the changes in slurry particle size and concentration in real time.

[0046] In some embodiments, when it is determined that the ball mill is in an over-grinding state, that is, the discharge particle size is too small, the reasons may be that the ball mill feeds too little ore, adds too much water, has low slurry concentration, etc. The CPU central processing unit outputs the control parameters according to the calculation results of the PID calculation system, adjusts the speed of the feeding conveyor, increases the ore feed of the ball mill, reduces the water supply, and monitors the slurry particle size and concentration changes in real time.

[0047] Specifically, taking the grinding of copper ore as an example, the grinding particle size result needs to reach -200 mesh accounting for 70%-80%. If the actual grinding particle size result is -150 mesh accounting for 70%-80%, the ball mill is in an under-grinding state and the particle size is too coarse; if the actual grinding particle size result is -250 mesh accounting for 70%-80%, the ball mill is in an over-grinding state and the particle size is too fine. Then, the calculation formula in the PID calculation system is used to obtain the control parameters of the ore conveyor and the water valve based on the difference between the input particle size result and the set particle size, and the control parameters are output to the corresponding actuators, thereby adjusting the ore conveyor speed and the water valve opening. After this type of ore is processed by the method provided in this application, the subsequent output slurry can meet the -200 mesh accounting for 70%-80%.

[0048] In some embodiments, the CPU central processing unit calculates the number of steel balls to be added based on the wear rate of the steel balls in the ball mill, outputs the control parameters, and controls the valve to add steel balls.

[0049] In some embodiments, when seasonal changes affect the moisture content of the raw ore, the control parameters are output by the CPU central processing unit to control the water valve to adjust the amount of water added to ensure that the slurry concentration meets the set requirements.

[0050] In some embodiments, by analyzing and counting the raw data acquired in real time, comparing the grinding effects under different conditions, and finding the optimal control parameter range, the ball mill can be operated under the conditions of maximum output, particle size distribution, and optimal slurry concentration.

[0051] In summary, compared with the prior art, the embodiment of the present application provides a simple and effective real-time online particle size adjustment system for a ball mill, which realizes online automatic adjustment of the grinding particle size by detecting some front-end and back-end parameters, performing PID calculations, and using a CPU central processing unit for control, so as to stabilize the grinding particle size within a set range.

[0052] Note that, unless otherwise directly stated, all features disclosed in this specification (including any attached claims, abstracts and drawings) may be replaced by alternative features for achieving the same, equivalent or similar purposes. Therefore, unless otherwise explicitly stated, each feature disclosed is only an example of a group of equivalent or similar features. Where used, further, preferably, further and more preferably are simple beginnings for elaborating another embodiment based on the aforementioned embodiment, and the content of the further, preferably, further or more preferably followed by the combination with the aforementioned embodiment constitutes a complete construction of another embodiment. Several further, preferably, further or more preferably settings following the same embodiment can be arbitrarily combined to form another embodiment.

[0053] In the implementation of functions and steps, the corresponding functions and steps in various embodiments may also occur in a different order than shown. For example, two consecutive functions and steps may actually be performed or implemented substantially in parallel, and they may sometimes be performed or implemented in the opposite order, depending on the functions involved.

[0054] Although the present application has been described in detail above with general descriptions and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements may be made to the present application. Therefore, these modifications or improvements made without departing from the spirit of the present application all fall within the scope of protection claimed in the present application.

Claims

1. A simple and effective real-time online particle size adjustment system for a ball mill, characterized in that: include: Data acquisition sensor, CPU central processing unit, actuator, among which, The data acquisition sensor is used to obtain raw data, which includes particle size results, ball mill feed amount, water addition amount, slurry concentration, steel ball diameter and ball addition amount, and ball mill motor current; The CPU is electrically connected to the data acquisition sensor, and is used to obtain the original data transmitted by the data acquisition sensor, and output the control parameters to the actuator by running the PID operation system; The actuator comprises a water valve, an ore-feeding conveyor and a valve. The water valve is used to control the amount of water added, the ore-feeding conveyor is used to control the amount of ore fed to the ball mill, and the valve is used to control the amount of steel balls added.

2. The simple and effective real-time online particle size adjustment system for a ball mill according to claim 1 is characterized in that: The particle size result is obtained by analyzing with a laser particle size analyzer; The slurry concentration is measured by a concentration meter; The ball mill feed amount is measured and controlled by an electronic belt scale on the feed equipment, and the water addition amount is measured by a flow meter.

3. The simple and effective real-time online particle size adjustment system for a ball mill according to claim 1 is characterized in that: After the particle size result is transmitted to the CPU central processing unit, it is compared with the set particle size to determine whether the ball mill is currently in an under-grinding or over-grinding state.

4. The simple and effective real-time online particle size adjustment system for a ball mill according to claim 3 is characterized in that: The step of outputting control parameters to the actuator by running the PID operation system includes: The CPU central processing unit obtains the ball mill feed amount, water addition amount, steel ball amount, and slurry concentration in real time, and obtains the functional relationship between the slurry particle size distribution and each control parameter by using the PID operation system and the operation formula: Wherein, Kp represents proportional gain, Kp is inversely related to proportionality, Tt represents integral time constant, TD represents differential time constant, u(t) represents the output control parameter, and e(t) represents the difference between the set value r(t) including the set granularity and the measured value of the original data.

5. The simple and effective real-time online particle size adjustment system for a ball mill according to claim 4 is characterized in that: When it is determined that the ball mill is in an under-grinding state, the CPU central processing unit outputs the control parameters according to the calculation results of the PID calculation system, adjusts the speed of the feeding conveyor, reduces the ore feeding amount of the ball mill, increases the water valve opening, increases the water supply, and monitors the changes in the slurry particle size and concentration in real time.

6. The simple and effective real-time online particle size adjustment system for a ball mill according to claim 4 is characterized in that: When it is determined that the ball mill is in an over-grinding state, the CPU central processing unit outputs the control parameters according to the calculation results of the PID calculation system, adjusts the speed of the feeding conveyor, increases the ore feeding amount of the ball mill, reduces the water valve opening, reduces the water feeding amount, and monitors the changes in the slurry particle size and concentration in real time.

7. The simple and effective real-time online particle size adjustment system for a ball mill according to claim 1 is characterized in that: The CPU central processing unit calculates the number of steel balls to be supplemented according to the wear rate of the steel balls in the ball mill, outputs the control parameters, and controls the valve to supplement the steel balls.

8. The simple and effective real-time online particle size adjustment system for a ball mill according to claim 1 is characterized in that: When seasonal changes affect the moisture content of the raw ore, the control parameters are output through the CPU central processing unit to control the water valve to adjust the amount of water added to ensure that the slurry concentration meets the set requirements.

9. The simple and effective real-time online particle size adjustment system for a ball mill according to claim 1 is characterized in that: By analyzing and counting the raw data acquired in real time, the grinding effects under different conditions are compared to find out the best control parameter range.

Images