CN120920175A - Control method for preventing granularity segregation of large semi-autogenous mill feeding - Google Patents
Control method for preventing granularity segregation of large semi-autogenous mill feedingInfo
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- CN120920175A CN120920175A CN202511165020.9A CN202511165020A CN120920175A CN 120920175 A CN120920175 A CN 120920175A CN 202511165020 A CN202511165020 A CN 202511165020A CN 120920175 A CN120920175 A CN 120920175A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C25/00—Control arrangements specially adapted for crushing or disintegrating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/02—Feeding devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/02—Investigating particle size or size distribution
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Abstract
本发明属于矿物加工技术领域，提供一种大型半自磨给料防止粒度偏析的控制方法，通过料仓结构优化结合多维度监测和智能闭环控制的技术路径，对料仓设置中心加周边对称下料口，利用雷达料位计进行动态料位监测，通过各下料口下方集矿皮带配置变频器调速控制，基于PID算法，根据料位高度、给矿量、粒度偏差等数据调节皮带速度，形成闭环控制。本发明方法解决现有技术中存在的粒度偏析严重、给料不均匀、人工干预依赖强等问题，实现半自磨给料的粒度均匀化、稳定化，提高半自磨的运行效率和生产安全性，减少人工干预，降低生产成本，有效提升生产效率与经济效益。
This invention belongs to the field of mineral processing technology and provides a control method for preventing particle size segregation in large-scale semi-autogenous grinding mills. It employs a technical approach combining silo structure optimization with multi-dimensional monitoring and intelligent closed-loop control. The silo is equipped with symmetrical feed inlets at the center and periphery. Dynamic material level monitoring is performed using radar level gauges, and speed control is achieved through frequency converters configured on the conveyor belts below each feed inlet. Based on a PID algorithm, the belt speed is adjusted according to data such as material level, feed rate, and particle size deviation, forming a closed-loop control. This invention solves the problems of severe particle size segregation, uneven feeding, and heavy reliance on manual intervention in existing technologies. It achieves uniform and stable particle size in the semi-autogenous grinding mill feed, improves the operating efficiency and production safety of the mill, reduces manual intervention, lowers production costs, and effectively enhances production efficiency and economic benefits.
Description
Technical Field
The invention belongs to the technical field of mineral processing, relates to feeding control of large semi-autogenous grinding equipment, and particularly relates to a control method for preventing granularity segregation of large semi-autogenous grinding feeding.
Background
When the ore blasted in a stope is transported to a bin through a bin feeding belt, a typical particle size segregation cone is formed due to the gravity separation effect of particles, wherein the center area is fine particles (< 150 mm), the height of blanking points is high, the inertia operation of the fine particles is small, the natural repose angle is small, fine particles and low-porosity accumulation are formed, and the edge area is coarse particles (> 200 mm) and roll to the edge of a pile due to inertia effect, so that a high-porosity coarse particle endless belt is formed. The natural segregation causes the standard deviation of the initial ore feeding granularity to be +/-40 mm under the traditional single-center blanking port or multi-port random blanking mode, and the standard deviation is far beyond the ideal ore feeding uniformity requirement of semi-self-grinding (standard deviation is less than or equal to +/-15 mm). The prior art has the following remarkable problems:
1. The granularity segregation is serious, namely, the granularity segregation formed by natural accumulation makes the ore granularity of different feed openings have larger difference, and the uniformity of the ore feeding granularity is difficult to ensure.
2. The manual intervention is highly dependent, the granularity condition of each blanking opening needs to be detected through manual observation or an instrument, and then manual intervention adjustment is carried out, so that the randomness of the mode is high, the discharging quantity and granularity distribution cannot be accurately controlled in real time, the ore blocking degree is high and low, and the semi-self-grinding power is unstable.
3. The shape of the material pile is difficult to maintain, the material pile in the storage bin cannot maintain ideal cone shape, and large ores enter low-lying parts after the materials are fed in a stope, so that the granularity segregation is further increased.
4. The production efficiency and the equipment safety are affected, the feeding is uneven, the semi-autogenous grinding power is increased rapidly when the granularity is coarse, the processing amount is required to be reduced, the yield is affected, if the processing is not performed in time, the belly expansion phenomenon is even caused, the equipment is damaged, the unit consumption of the steel balls is increased, and the production cost is increased.
Currently, the closest prior art documents include:
1. Patent literature, a semi-autogenous mill feed system, suggests a conventional configuration of a semi-autogenous mill feed system, but does not involve systematic control of bin structure optimization and particle size segregation.
2. Journal literature on research on the influence of feed particle size distribution on grinding efficiency in a semi-autogenous grinding process, wherein the influence of feed particle size segregation on the semi-autogenous grinding efficiency is analyzed, but a specific control method is not proposed.
Disclosure of Invention
The invention aims to provide a control method for preventing granularity segregation of large semi-self-grinding feeding, which solves the problems of serious granularity segregation, uneven feeding, strong dependence of manual intervention and the like in the prior art by optimizing a bin structure, configuring an intelligent control system and reasonable process flow, realizes the granularity homogenization and stabilization of the semi-self-grinding feeding, improves the running efficiency and production safety of the semi-self-grinding and reduces the production cost.
The technical scheme adopted by the invention for achieving the purpose is as follows:
A control method for preventing particle size segregation of a large semi-autogenous mill feedstock, comprising:
1. the blanking opening of the storage bin is arranged;
4-7 discharging openings are formed in the bottom of the storage bin, wherein 1 discharging opening is formed in the center of the bottom of the storage bin, and 3-6 discharging openings are uniformly and symmetrically distributed on the periphery of the bottom of the storage bin;
2. setting and controlling an ore collecting belt;
The belt speed of the ore collecting belt and the discharge amount form a linear relation, and the rotation speed of the motor is changed by adjusting the output frequency of the frequency converter, so that the belt speed is controlled to realize the accurate adjustment of the discharge amount;
3. Setting material level monitoring equipment, judging the form of a material pile according to the material level height of a material outlet, and ensuring that the material pile keeps a cone shape with a high center and a low periphery;
4. A belt electronic scale and an online granularity analysis device are arranged on a semi-self-grinding ore feeding main belt, and the belt speed of an ore collecting belt and the discharge amount of a discharging opening are adjusted according to ore feeding amount and granularity composition data, so that the control of ore feeding amount and ore granularity distribution is realized.
Furthermore, the size of the feed opening is designed according to the volume of the storage bin and the ore feeding amount, so that the ore can be smoothly discharged, and the influence of the oversized or undersized feed opening on the granularity distribution is avoided.
Further, the frequency converter selects the model according to the belt load and the speed regulation range.
Further, the material level monitoring equipment selects a radar material level gauge, the radar material level gauge is arranged at the top of each feed opening, the monitoring range of the radar material level gauge is 0-50m, the precision is +/-0.1 m, the material level height right above the feed opening can be measured in real time, and the radar material level gauge transmits data to the centralized control system through 4-20mA signals or Modbus protocol.
The centralized control system stores material level, belt speed and ore feeding quantity data through a real-time database, and supports historical trend query and fault alarm functions, the data acquisition of the data acquisition module comprises the step of uploading the material level height of each blanking opening in real time through a radar level indicator, the belt electronic scale detects the total ore feeding quantity of a main belt, and the online granularity analysis device feeds back ore granularity distribution.
Further, the method for controlling the material level of the peripheral blanking port comprises the following steps:
when delta h i is more than 0.5m, increasing the frequency of a mineral collecting belt of a high material level feed opening, reducing the frequency of the mineral collecting belt of a low material level feed opening, and correcting the material level difference by an adjustment quantity delta f i;
The calculation formula of the adjustment quantity Deltaf i is Deltaf i =Kp*Δhi +Ki∫Δhidt+Kd（dΔhi/dt
K p、Ki、Kd is PID parameter, and is optimized through on-site debugging;
After receiving the frequency adjustment instruction, the frequency converter completes rotation speed adjustment within 500ms, so as to realize balance of peripheral material levels;
When h min is less than 0.5m, stopping the operation of the ore collecting belt, and sending a warning to prevent the material level from being too low to lead to smashing a material nozzle during discharging.
Further, the control method for the difference between the central material level and Zhou Bianliao bits comprises the following steps:
Center level to peripheral level difference Δh 0 = center level height h 1 -maximum height of peripheral feedwell h max, Δh 0>L0 x 0.58, where L 0 is the horizontal distance of peripheral feedwell to center feedwell;
When Δh 0＜L0 is 0.58, the discharging speed of the peripheral blanking port is improved by integrally improving the frequency adjustment quantity Δf i of the peripheral blanking port belt.
The calculation formula of the adjustment quantity Deltaf i is Deltaf i =Kp*Δh0 +Ki∫Δh0dt+Kd（dΔh0/dt
K p、Ki、Kd is PID parameter, and is optimized through on-site debugging;
after receiving the frequency adjusting instruction, the frequency converter completes the rotation speed adjustment within 500ms, and the adjustment of peripheral material level is realized.
Further, the method for controlling the deviation of the ore feeding amount comprises the following steps:
The feeding quantity deviation delta Q=feeding quantity set value Q setting value -actual feeding quantity Q total, the control algorithm is based on PID (proportion-integral-derivative), and the frequency integral adjustment quantity delta f i of each ore collecting belt is calculated according to the feeding quantity deviation;
the calculation formula of the adjustment quantity Deltaf i is Deltaf i =Kp*ΔQ +Ki∫ΔQdt+Kd (dDeltaQ/dt)
K p、Ki、Kd is PID parameter, and is optimized through on-site debugging;
After receiving the frequency adjusting instruction, the frequency converter completes the rotation speed adjustment within 500ms, and realizes the dynamic balance of the discharge amount.
Further, the semi-self-grinding ore feeding granularity deviation control method comprises the following steps:
particle size deviation Δd=semi-autogenous feed particle size D (x) -historical feed average particle size D 0, control algorithm based on PID (proportional-integral-derivative) control algorithm, frequency adjustment amount Δf i of each mineral collecting belt is calculated according to particle size deviation;
the calculation formula of the adjustment quantity Deltaf i is Deltaf i =Kp*ΔD +Ki∫ΔDdt+Kd (dDeltaD/dt)
K p、Ki、Kd is PID parameter, and is optimized through on-site debugging;
After the frequency converter receives the frequency adjusting instruction, the rotating speed adjustment is completed within 500ms, and the dynamic balance of the feeding granularity is realized.
The beneficial effects of the invention compared with the prior art are as follows:
(one) effective inhibition of particle size segregation
Through optimizing feed bin feed opening overall arrangement and adopting adaptive control system, make the stockpile in the feed bin maintain ideal toper form, middle height, low and the high uniform decline all around makes center feed opening and the feed opening granularity around keep relatively stable, through the adjustment of the discharge volume of center feed opening and feed opening around, makes the ore feeding granularity distribution more even. Through practical application tests, the standard deviation of ore feeding granularity is reduced by about 3 percent compared with the prior art, and the uniformity of semi-autogenous grinding ore feeding is effectively improved.
(II) improving the running stability of semi-self-grinding
The uniform ore feeding granularity and the stable discharging amount greatly reduce the power fluctuation range of the semi-self-grinding. According to statistics, the fluctuation amplitude of the semi-self-grinding power is obviously reduced, and particularly, the frequency of high power can be reduced by about 50%, so that the risks of sharp power rise and belly expansion caused by coarse granularity are avoided, the running stability and safety of the semi-self-grinding are improved, and the equipment failure downtime is reduced.
(III) improving production efficiency and reducing cost
The ore feeding uniformity is improved, the semi-autogenous mill can operate under a stable working condition, the higher treatment capacity can be kept, the problem of reduction of the treatment capacity caused by granularity segregation is avoided, and the production efficiency is improved. Meanwhile, the stable operation condition reduces the unit consumption of the steel ball.
(IV) realizing automatic control and reducing manual intervention
According to the invention, through the centralized control system and various detection devices, the automatic control of the feeding process is realized, the granularity condition of the discharging opening is not required to be observed and regulated manually in real time, the manual intervention is reduced, the labor intensity of operators is reduced, and the intelligent level of the production process is improved.
Drawings
FIG. 1 is a front view of a bin configuration according to an embodiment of the invention;
FIG. 2 is a left side view of a bin configuration according to an embodiment of the invention;
FIG. 3 is a top view of a bin configuration according to an embodiment of the invention;
In the figure, 1# radar level gauge (central feed opening level gauge), 2# radar level gauge, 3# radar level gauge, 4# radar level gauge, 5# radar level gauge, 6# radar level gauge, 7# radar level gauge, 8 # material pile, 9, bin feeding belt, 10, on-line granularity analysis device, 11 # feed opening, 1# feed opening, 12 # feed opening, 2# feed opening, 13 # feed opening, 14 # feed opening, 4# feed opening, 15 # feed opening, 5# feed opening, 16 # feed opening, 6# feed opening, 17 # feed opening, 7# feed opening, 18 # mineral collecting belt, 1# mineral collecting belt, 19, 2# mineral collecting belt, 20 # mineral collecting belt, 3# mineral collecting belt, 21 # mineral collecting belt, 4# mineral collecting belt, 22, 5# mineral collecting belt, 23, 6# mineral collecting belt, 24, 7# mineral collecting belt, 25, semi-self-feeding main belt, 26, belt electronic scale.
Detailed Description
The technical solution of the present invention will be described with reference to the accompanying drawings and preferred embodiments, it being understood that the preferred examples described herein are for illustration and explanation of the present invention only and are not intended to limit the present invention.
Examples
Yuan Gucun iron ore adopts an SAB ore grinding process, 1400-0 mm ore extracted from an open-air mining field is transported to a coarse crushing station through a dump truck, crushed by a 63 '-89' or 63 '-114' gyratory crusher, 200-0 mm (P80=150mm) ore is obtained, and transported to a raw ore bin of the ore dressing plant through a belt conveyor.
Raw ore bin and equipment parameters of concentrating mill:
raw ore bin single-series volume 12500m3, ore storage amount 20551t, ore storage time 21.5 hours, single-series semi-self-grinding ore feeding amount 927t/h, and discharging by a tape machine, wherein the size of a discharging hole is 1400 multiplied by 3000.
2. The semi-self-grinding loop is provided with 3 phi 34 'x 18' wet semi-self-grinding machines, each installed power is 2 x 5500kW, ore discharged from the semi-self-grinding machines is graded through a straight line screen, and ore with the diameter of +12.7mm on the screen is returned to the semi-self-grinding feeding belt conveyor through a return belt conveyor.
The implementation of the method of the present invention, as shown in FIGS. 1-3, comprises:
1. The method comprises the steps of configuring bin discharging openings, namely arranging 7 discharging openings at the bottom of a bin, wherein 1# 1 discharging opening 11 is arranged in the center of the bottom of the bin, 6 discharging openings are uniformly and symmetrically distributed on the periphery, namely a # 2 discharging opening 12, a # 3 discharging opening 13, a # 4 discharging opening 14, a # 5 discharging opening 15, a # 6 discharging opening 16 and a # 7 discharging opening 17, the sizes of the discharging openings are designed according to the volume and the feeding amount of the bin, smooth discharge of ore is ensured, and the influence of oversized or undersized discharging openings on granularity distribution is avoided, wherein the sizes of the discharging openings in the embodiment are 1400mm multiplied by 3000mm;
2. setting and controlling an ore collecting belt;
the ore collecting belts are arranged below each blanking opening and are respectively a 1# ore collecting belt 18, a 2# ore collecting belt 19, a 3# ore collecting belt 20, a 4# ore collecting belt 21, a 5# ore collecting belt 22, a 6# ore collecting belt 23 and a 7# ore collecting belt 24, each ore collecting belt is independently provided with a driving wheel power motor, the motors are all connected with frequency converters, the frequency converters select types according to belt loads and speed regulation ranges, the ABB ACS880 series frequency converters are adopted in the embodiment, the belt speed of the ore collecting belts and the discharge quantity form a linear relation, and the belt speed is controlled with the accuracy of +/-0.1 Hz in the range of 0-50Hz by adjusting the output frequency of the frequency converters, so that the discharge quantity is accurately regulated.
3. Setting a material level monitoring device, wherein the material level monitoring device selects Siemens radar material level meters, a radar material level meter is arranged at the top of each feed opening, the radar material level meters are respectively 1# radar material level meter 1 (central feed opening material level meter), 2# radar material level meter 2, 3# radar material level meter 3, 4# radar material level meter 4, 5# radar material level meter 5, 6# radar material level meter 6 and 7# radar material level meter 7, the monitoring range of the radar material level meters is 0-50m, the precision is +/-0.1 m, the material level height right above the feed opening can be measured in real time, the radar material level meters transmit data to a centralized control system through 4-20mA signals or Modbus protocol, the material pile form is judged according to the material level height of the feed opening, and the material pile 8 conveyed by a feed bin feeding belt 9 is ensured to keep the central high and the circumference low cone shape.
The specific control method for the material level of the peripheral feed opening comprises the following steps:
when delta h i is more than 0.5m, increasing the frequency of a mineral collecting belt of a high material level feed opening, reducing the frequency of the mineral collecting belt of a low material level feed opening, and correcting the material level difference by an adjustment quantity delta f i;
the calculation formula of the adjustment quantity Deltaf i is Deltaf i =Kp*Δhi +Ki∫Δhidt+Kd（dΔhi/dt
K p、Ki、Kd is PID parameter, and is optimized through on-site debugging;
And when h min is less than 0.5m, stopping the operation of the ore collecting belt and sending a warning to prevent the material from smashing a material nozzle when the material level is too low.
The control method of the central material level and Zhou Bianliao bit difference comprises the following steps:
Center level to peripheral level difference Δh 0 = center level height h 1 -maximum height of peripheral feedwell h max, Δh 0>L0 x 0.58, where L 0 is the horizontal distance of peripheral feedwell to center feedwell;
When Δh 0＜L0 is 0.58, the discharging speed of the peripheral blanking port is improved by integrally improving the frequency adjustment quantity Δf i of the peripheral blanking port belt.
The calculation formula of the adjustment quantity Deltaf i is Deltaf i =Kp*Δh0 +Ki∫Δh0dt+Kd（dΔh0/dt
K p、Ki、Kd is PID parameter, and is optimized through on-site debugging;
after receiving the frequency adjusting instruction, the frequency converter completes the rotation speed adjustment within 500ms, and the adjustment of peripheral material level is realized.
In the embodiment, when the system is in operation, the height of the material level right above each blanking opening is measured in real time, and if the maximum height and the minimum height of the material level difference of the material level of the peripheral blanking openings exceed 0.5 meter, or the difference between the central material level and the peripheral material level exceeds 0.58 times of the horizontal distance from the peripheral blanking opening to the central blanking opening, the variable frequency adjustment instruction is immediately triggered.
4. A belt electronic scale 26 and an online granularity analysis device 10 are arranged on a semi-self-grinding ore feeding main belt 25, and the belt speed of an ore collecting belt and the discharge amount of a discharging opening are adjusted according to the ore feeding amount and granularity composition data, so that the control of the ore feeding amount and the ore granularity distribution is realized.
The specific method for controlling the deviation of the ore feeding amount comprises the following steps:
The feeding quantity deviation delta Q=feeding quantity set value Q setting value -actual feeding quantity Q total, the control algorithm is based on PID (proportion-integral-derivative), and the frequency integral adjustment quantity delta f i of each ore collecting belt is calculated according to the feeding quantity deviation;
The calculation formula of the adjustment quantity Deltaf i is Deltaf i =Kp*ΔQ +Ki∫ΔQdt+Kd (dDeltaQ/dt)
K p、Ki、Kd is PID parameter, and is optimized through on-site debugging;
after the frequency converter receives the frequency adjustment instruction, the rotating speed adjustment is completed within 500ms, and the dynamic balance of the discharge quantity is realized.
The semi-self-grinding ore feeding granularity deviation control method comprises the following steps:
particle size deviation Δd=semi-autogenous feed particle size D (x) -historical feed average particle size D 0, control algorithm based on PID (proportional-integral-derivative) control algorithm, frequency adjustment amount Δf i of each mineral collecting belt is calculated according to particle size deviation;
The calculation formula of the adjustment quantity Deltaf i is Deltaf i =Kp*ΔD +Ki∫ΔDdt+Kd (dDeltaD/dt)
K p、Ki、Kd is PID parameter, and is optimized through on-site debugging;
after the frequency converter receives the frequency adjustment instruction, the rotating speed adjustment is completed within 500ms, and the dynamic balance of the feeding granularity is realized.
In the embodiment, when the belt electronic scale 26 detects that the deviation Δq exists between the feeding amount q_total and the set value, or the deviation Δd exists between the feeding granularity D (x) and the historical average granularity D 0 through analysis by the online granularity analysis device, the centralized control system calculates the frequency adjustment amount Δfi of each ore collecting belt based on the PID control algorithm, and sends an instruction to the frequency converter, and the frequency converter completes rotation speed adjustment within 500ms, so as to realize dynamic balance of the discharging amount and granularity distribution.
The centralized control system comprises an industrial computer, a data acquisition module, a control module and a human-computer interface, wherein the centralized control system stores material level, belt speed and ore feeding quantity data through a real-time database and supports historical trend query and fault alarm functions, the data acquisition of the data acquisition module comprises the steps of uploading the material level height of each blanking port in real time through a radar material level indicator, and the belt electronic scale detects the total ore feeding quantity of a main belt and feeds back ore granularity distribution through an online granularity analysis device.
The method adopts a technical path of 'bin structure optimization + multi-dimensional monitoring + intelligent closed-loop control', adopts symmetrical blanking openings of '1 center +3-6 periphery' arrangement, forms a discharging network covering the whole region of the bin, and forcedly mixes ores with different granularities through multi-region collaborative discharging.
The method is based on the radar level gauge to monitor the level height of each blanking opening in real time, and dynamically adjusts the belt speed of the ore collecting belt through the PID closed-loop algorithm of the centralized control system, so as to ensure that the conical shape with high middle and low periphery of the material pile is maintained.
According to the method, through monitoring the deviation of the feeding amount and the set feeding amount in real time, the belt speed of the ore collecting belt is regulated according to the material level deviation, and the dual-purpose control of total amount control and form maintenance is realized.
The method integrates material level detection, online granularity analysis, belt electronic scale metering and frequency converter adjustment, forms a full-flow automatic closed loop for detection, calculation and adjustment, does not need manual intervention, controls the accuracy to achieve +/-3% ore feeding quantity fluctuation, and is obviously superior to the fluctuation level of +/-10% of the traditional manual adjustment.
After the method is put into use, through practical application tests, the standard deviation of the ore feeding granularity is reduced from +/-20 mm to +/-10 mm in the prior art, and is reduced by about 10% compared with the prior art, so that the uniformity of semi-self-grinding ore feeding is effectively improved. The fluctuation amplitude of the semi-self-grinding power is reduced, particularly the frequency of high power can be reduced by about 50%, the risk of rapid power rise and belly expansion caused by coarse granularity is avoided, the running stability and safety of the semi-self-grinding are improved, the processing capacity of the semi-self-grinding is improved by 24t/h, the unit consumption of steel balls is reduced by 0.1kg/t in grinding compared with the prior art, and the production cost is obviously reduced. Meanwhile, the automatic control of the feeding process is realized, the granularity condition of a feed opening is not required to be observed and regulated manually in real time, the labor intensity of operators is reduced, and the intelligent level of the production process is improved.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that, for a person skilled in the art, modifications and variations can be made without departing from the technical principles of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (9)
1. A control method for preventing grain size segregation of large semi-self-grinding feed is characterized by comprising the following steps:
(1) The blanking opening of the storage bin is arranged;
4-7 discharging openings are formed in the bottom of the storage bin, wherein 1 discharging opening is formed in the center of the bottom of the storage bin, and 3-6 discharging openings are uniformly and symmetrically distributed on the periphery of the bottom of the storage bin;
(2) Setting and controlling an ore collecting belt;
The belt speed of the ore collecting belt and the discharge amount form a linear relation, and the rotation speed of the motor is changed by adjusting the output frequency of the frequency converter, so that the belt speed is controlled to realize the accurate adjustment of the discharge amount;
(3) Setting material level monitoring equipment, judging the form of a material pile according to the material level height of a material outlet, and ensuring that the material pile keeps a cone shape with a high center and a low periphery;
(4) A belt electronic scale and an online granularity analysis device are arranged on a semi-self-grinding ore feeding main belt, and the belt speed of an ore collecting belt and the discharge amount of a discharging opening are adjusted according to ore feeding amount and granularity composition data, so that the control of ore feeding amount and ore granularity distribution is realized.
2. The method for controlling large semi-autogenous grinding feeding to prevent grain size segregation according to claim 1, wherein the size of the feed opening is designed according to the volume of the storage bin and the feeding amount, so that smooth discharge of ore is ensured, and the influence of the oversized or undersized feed opening on grain size distribution is avoided.
3. The method for controlling large semi-autogenous grinding feed to prevent grain size segregation according to claim 1, wherein the frequency converter is of a type selected according to belt load and speed regulation range.
4. The control method for preventing grain size segregation of large semi-self-grinding feeding according to claim 1, wherein the level monitoring equipment is a radar level gauge, the radar level gauge is installed at the top of each feed opening, the monitoring range of the radar level gauge is 0-50m, the accuracy is +/-0.1 m, the level height right above the feed opening can be measured in real time, and the radar level gauge transmits data to a centralized control system through 4-20mA signals or Modbus protocol.
5. The method for controlling large semi-autogenous grinding feeding to prevent grain size segregation according to claim 4, wherein the centralized control system comprises an industrial computer, a data acquisition module, a control module and a human-computer interface, the centralized control system stores material level, belt speed and feeding amount data through a real-time database and supports historical trend query and fault alarm functions, the data acquisition of the data acquisition module comprises the steps of uploading material level height of each feeding opening in real time through a radar level indicator, detecting total feeding amount of a main belt through a belt electronic scale, and feeding back ore grain size distribution through an online grain size analysis device.
6. The method for controlling the material level of the peripheral feed opening, which is disclosed in claim 1, is characterized by comprising the following steps:
When delta h i is more than 0.5m, increasing the frequency of the ore collecting belt of the high-level feed opening, and reducing the frequency regulating quantity delta f i of the ore collecting belt of the low-level feed opening to perform level difference correction;
The calculation formula of the adjustment quantity Deltaf i is Deltaf i =Kp*Δhi +Ki∫Δhidt+Kd（dΔhi/dt
K p、Ki、Kd is PID parameter, and is optimized through on-site debugging;
After receiving the frequency adjustment instruction, the frequency converter completes rotation speed adjustment within 500ms, so as to realize balance of peripheral material levels;
When h min is less than 0.5m, stopping the operation of the ore collecting belt, and sending a warning to prevent the material level from being too low to lead to smashing a material nozzle during discharging.
7. The method for controlling the large semi-autogenous grinding feed to prevent grain size segregation according to claim 1, wherein the method for controlling the difference between the central material level and Zhou Bianliao bits comprises the following steps:
Center level to peripheral level difference Δh 0 = center level height h 1 -maximum height of peripheral feedwell h max, Δh 0>L0 x 0.58, where L 0 is the horizontal distance of peripheral feedwell to center feedwell;
When Δh 0＜L0 is 0.58, the discharging speed of the peripheral blanking port is improved by integrally improving the frequency adjustment quantity Δf i of the peripheral blanking port belt;
The calculation formula of the adjustment quantity Deltaf i is Deltaf i =Kp*Δh0 +Ki∫Δh0dt+Kd（dΔh0/dt
K p、Ki、Kd is PID parameter, and is optimized through on-site debugging;
after receiving the frequency adjusting instruction, the frequency converter completes the rotation speed adjustment within 500ms, and the adjustment of peripheral material level is realized.
8. The method for controlling the large semi-autogenous grinding feed to prevent grain size segregation according to claim 1, wherein the method for controlling the deviation of the ore feeding amount comprises the following steps:
The feeding quantity deviation delta Q=feeding quantity set value Q setting value -actual feeding quantity Q total, the control algorithm is based on PID (proportion-integral-derivative), and the frequency integral adjustment quantity delta f i of each ore collecting belt is calculated according to the feeding quantity deviation;
the calculation formula of the adjustment quantity Deltaf i is Deltaf i =Kp*ΔQ +Ki∫ΔQdt+Kd (dDeltaQ/dt)
K p、Ki、Kd is PID parameter, and is optimized through on-site debugging;
After receiving the frequency adjusting instruction, the frequency converter completes the rotation speed adjustment within 500ms, and realizes the dynamic balance of the discharge amount.
9. The method for controlling the granularity segregation of the large semi-autogenous grinding feed according to claim 1, wherein the method for controlling the granularity deviation of the semi-autogenous grinding feed comprises the following steps:
Semi-self-grinding ore feeding granularity deviation delta D=semi-self-grinding feeding granularity D (x) -historical feeding average granularity D 0, a control algorithm, namely calculating the frequency adjustment quantity delta f i of each ore collecting belt according to granularity deviation based on a PID control algorithm;
the calculation formula of the adjustment quantity Deltaf i is Deltaf i =Kp*ΔD +Ki∫ΔDdt+Kd (dDeltaD/dt)
K p、Ki、Kd is PID parameter, and is optimized through on-site debugging;
After the frequency converter receives the frequency adjusting instruction, the rotating speed adjustment is completed within 500ms, and the dynamic balance of the feeding granularity is realized.
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