CN112619214A - Method for solving underflow discharge of deep cone thickener - Google Patents
Method for solving underflow discharge of deep cone thickener Download PDFInfo
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- CN112619214A CN112619214A CN202011462811.5A CN202011462811A CN112619214A CN 112619214 A CN112619214 A CN 112619214A CN 202011462811 A CN202011462811 A CN 202011462811A CN 112619214 A CN112619214 A CN 112619214A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/24—Feed or discharge mechanisms for settling tanks
- B01D21/2405—Feed mechanisms for settling tanks
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/24—Feed or discharge mechanisms for settling tanks
- B01D21/245—Discharge mechanisms for the sediments
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/30—Control equipment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/30—Control equipment
- B01D21/34—Controlling the feed distribution; Controlling the liquid level ; Control of process parameters
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Abstract
The invention discloses a method for solving the problem of underflow discharge of a deep cone thickener, which relates to the field of mine tailings disposal and comprises the following steps: the feeding mechanism feeds the material into the deep cone thickener; obtaining a feeding coefficient; if the feeding coefficient exceeds/is lower than the preset coefficient threshold range, generating an early warning signal; the control center receives the early warning signal and distributes corresponding managers to adjust the feeding mechanism, the feeding coefficient is adjusted to be within a preset coefficient threshold range, the phenomenon that materials are stacked in deep conical pits due to the fact that the material feeding speed is too high and the number of the materials is too large is avoided, the conical pits are blocked, the materials are hardened, and the equipment can be guaranteed to normally discharge underflow; when the pressure at the bottom of the deep cone thickener exceeds a preset pressure value, the control center controls the feeding mechanism to stop running; the control center controls the stirring mechanism to achieve the effects of scraping, diluting and improving the flowability of the over-concentrated or hardened materials in the conical pit according to the discharge coefficient of the underflow, wherein the stirring mechanism is controlled by the control center according to the corresponding stirring frequency threshold value.
Description
Technical Field
The invention relates to the field of mine tailing disposal, in particular to a method for solving the problem of underflow discharge of a deep cone thickener.
Background
The deep cone thickener is a machine body with a cylindrical upper part and a conical lower part, and the cone of the deep cone thickener is deeper as the name suggests. According to the working principle of the deep cone thickener, under the condition of adding a flocculating agent, flotation tail coal is sent into a feeding barrel with a cone-shaped distribution port at the lower part, most water in coal slime water flows to the periphery in a clarification area of a cylindrical part of the thickener and overflows, and a small part of water forms a small vortex in a floc settling area.
Because the deep cone thickener has high underflow concentration, small floor area, large treatment capacity and high efficiency, the deep cone thickener is more and more popular in the industries of coal dressing, mineral dressing, sewage treatment and the like in recent years, and particularly, the deep cone thickener is more and more rapidly popularized along with the domestic birth of large-scale central transmission and central rake-lifting deep cone thickeners. However, the deep cone thickener has a deeper central depth, the material concentration in the deep cone pit is high, the deep cone thickener is basically paste, the viscosity is high, the shear strength is high, the discharge is difficult, and hardening is easy.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a method for solving the problem of underflow discharge of a deep cone thickener. According to the invention, the control center distributes corresponding managers to adjust the feeding mechanism, so that the feeding coefficient is adjusted to be within the range of the preset coefficient threshold value, and the phenomena that the material blanking speed is too high and the quantity is too much, the materials are accumulated in the deep conical pits, the conical pits are blocked and the materials are hardened are avoided; the equipment can be ensured to normally discharge the underflow; when the pressure at the bottom of the deep cone thickener exceeds a preset pressure value, the control center controls the feeding mechanism to stop running; the control center controls the stirring mechanism to achieve the effects of scraping, diluting and improving the flowability of the over-concentrated or hardened materials in the conical pit according to the discharge coefficient of the underflow, wherein the stirring mechanism is controlled by the control center according to the corresponding stirring frequency threshold value.
The purpose of the invention can be realized by the following technical scheme:
a method for solving the problem of underflow discharge of a deep cone thickener comprises the following steps:
the method comprises the following steps: the feeding mechanism feeds the material into the deep cone thickener, and a feeding flowmeter, a feeding densimeter and a feeding concentration meter are arranged on the feeding mechanism; the feed flowmeter is used for monitoring the material flow sent into the deep cone thickener; the feeding densimeter is used for monitoring the density of the material fed into the deep cone thickener, and the feeding densimeter is used for monitoring the concentration of the material fed into the deep cone thickener;
step two: obtaining a feeding coefficient by combining the material flow, the material density and the material concentration; if the feeding coefficient exceeds/is lower than the preset coefficient threshold range, generating an early warning signal;
step three: the control center receives the early warning signal and distributes corresponding managers to adjust the feeding mechanism, and the feeding coefficient is adjusted to be within a preset coefficient threshold range;
step four: the bottom of the deep cone thickener is provided with a differential pressure type transmitter, the differential pressure type transmitter is used for monitoring the pressure at the bottom of the deep cone thickener in real time, and when the pressure at the bottom of the deep cone thickener exceeds a preset pressure value, the control center controls the feeding mechanism to stop running;
step five: the discharge port of the deep cone thickener is provided with an underflow flow meter and an underflow concentration meter; the underflow flow meter is used for monitoring the flow rate of the discharged underflow, the underflow concentration meter is used for monitoring the concentration of the discharged underflow, and the discharge coefficient of the underflow is obtained by combining the flow rate of the underflow, the concentration of the underflow and the pressure at the bottom of the deep cone thickener;
step six: the control center controls the stirring mechanism to operate at a corresponding stirring frequency threshold value according to the discharge coefficient of the underflow; the method specifically comprises the following steps:
s61: setting a plurality of stirring frequency thresholds and marking the thresholds as Km; m is 1, … …, j; k1< K2< … … < Kj; each stirring frequency corresponds to a preset discharge coefficient range which is sequentially (k1, k2, … …, (Km, Km + 1), when the DC belongs to (Km, Km + 1), the stirring frequency threshold corresponding to the preset discharge coefficient range is Km;
s62: and the control center controls the stirring mechanism to rotate according to the corresponding stirring frequency threshold value.
Further, the specific calculation method of the feeding coefficient in the step two is as follows:
s21: marking the material flow as WL, the material density as WM and the material concentration as WN;
s22: setting a corresponding feeding preset value for each material type, matching the material type with all the material types to obtain the feeding preset value corresponding to the material type, and marking the feeding preset value as WS;
s23: normalizing the material flow, the material density, the material concentration and the feeding preset value and taking the numerical values;
the feed coefficient SC is obtained by using the formula SC ═ WL × a1+ WM × a2+ WN × A3) × WS-1.265, where a1, a2 and A3 are all preset proportionality coefficients.
Further, the specific allocation steps in the third step are as follows:
s31: acquiring workers working at the current time and marking the workers as primary selection workers;
s32: sending a position acquisition instruction to a mobile phone terminal of the primary selection personnel to acquire the position of the primary selection personnel, calculating the distance difference between the position of the primary selection personnel and the position of the feeding mechanism to obtain the personnel distance, and marking the personnel distance as J1;
s33: setting the total management time length of the primary selection personnel on the same day as G1;
calculating the time difference between the time of entry of the primary selected person and the current time of the system to obtain the time length of entry of the primary selected person and marking the time length as G2;
setting the age of the primary selected person as N1; setting the management times of the primary selection personnel as C1;
s34: carrying out normalization processing on the personnel distance, the total management duration, the working duration, the management times and the age, and taking the values;
using formulas
s35: selecting the primary selection personnel with the maximum management value QW as the management personnel of the feeding mechanism; meanwhile, the management times of the manager are increased once;
s36: sending the position of the feeding mechanism to a mobile phone terminal of a manager; simultaneously marking the time of sending the position of the feeding mechanism as the position sending time;
s37: after arriving at the position of the feeding mechanism, a manager adjusts the feeding mechanism, and adjusts the feeding coefficient to be within a preset coefficient threshold value range; marking the time when the manager reaches the position of the feeding mechanism as the adjustment starting time;
s38: calculating the time difference between the position sending time and the adjusting starting time to obtain the buffer duration of the manager, and marking the buffer duration as TA;
calculating the time difference between the adjustment ending time and the adjustment starting time to obtain the single management time length of the manager, and marking the single management time length as TB;
summing the single management time length of the management personnel on the day to obtain the total management time length of the management personnel on the day; setting the score value input by a user as B;
obtaining a single value of a manager by using a formula SD which is 1/TA multiplied by h1+1/TB multiplied by h2+ B multiplied by h3, summing all the single values of the manager and averaging to obtain a mean value of the manager; wherein h1, h2 and h3 are all preset proportionality coefficients.
Further, the specific calculation method of the discharge coefficient of the underflow in the fifth step is as follows:
s51: marking the underflow flow as DL, marking the underflow concentration as DN, and marking the pressure at the bottom of the deep cone concentrator as DY;
s52: setting a corresponding stirring preset value for each material type, matching the material type with all the material types to obtain a stirring preset value corresponding to the material type, and marking the stirring preset value as GS;
s23: carrying out normalization treatment on the underflow flow, the underflow concentration, the bottom pressure and the stirring preset value and taking the numerical values of the underflow flow, the underflow concentration, the bottom pressure and the stirring preset value;
the discharge coefficient DC is obtained by using the formula DC ═ 1/DL × B1+ DN × B2+ DY × B3) × GS, where B1, B2 and B3 are all preset proportionality coefficients.
Further, the feeding mechanism comprises a supporting plate and a feeding box; a feeding box is fixedly mounted on the top end face of the supporting plate, a storage hopper is fixedly mounted on the upper portion of an inner cavity of the feeding box, a sealing cover is arranged at the top of the storage hopper, a feeding hole is formed in the bottom of the storage hopper, an inclined feeding barrel is arranged below the feeding hole and inside the feeding box, the feeding hole is communicated with the feeding barrel, and a main shaft is arranged inside the feeding barrel; the included angle between the feeding cylinder and the horizontal plane is 30-45 degrees;
the feeding device comprises a main shaft, a feeding barrel, a first motor, a second motor, a bearing, a first motor, a second motor, a third motor, a fourth motor, a fifth motor, a sixth motor;
a support plate is fixedly arranged at the bottom of the inner cavity of the feeding box, and the plane of the support plate is vertical to the main shaft; the first motor is fixedly arranged on the support plate, one end of the feeding cylinder body, which is far away from the first motor, penetrates through the side wall of the feeding box and extends to the outer side of the feeding box, and the outer end of the feeding cylinder body is communicated with a discharge hole; the bottom of the discharge port penetrates through the inner top wall of the deep cone thickener and extends to the interior of the deep cone thickener.
Further, the stirring mechanism comprises a second motor; the second motor is fixedly arranged at the top of the deep cone thickener; the output end of the second motor is fixedly provided with a second motor shaft, and the bottom of the second motor shaft penetrates through the inner top wall of the deep cone thickener and extends into the deep cone thickener; the bottom of the second motor shaft is fixedly provided with a conical roller, the two sides of the outer surface of the conical roller are fixedly provided with uniformly distributed stirring rods, scraping strips are fixedly arranged between the uniformly distributed stirring rods and one ends of the uniformly distributed stirring rods far away from the conical roller, and the bottoms of the two scraping strips are inclined towards the direction close to the conical roller;
the bottom of the conical roller is fixedly provided with a stirring shaft, and the stirring shaft is connected with the conical roller through a connecting flange; the bottom of the stirring shaft is sequentially provided with an upper spiral scraper, a positioning rod, a lower spiral scraper and stirring blades.
The invention has the beneficial effects that:
1. the invention can combine the material flow, the material density and the material concentration to obtain the feeding coefficient; if the feeding coefficient exceeds/is lower than the preset coefficient threshold range, the control center distributes corresponding management personnel to adjust the feeding mechanism, and the feeding coefficient is adjusted to be within the preset coefficient threshold range; materials can enter the deep cone thickener at a proper speed, the phenomenon that the materials are stacked in a deep cone pit due to too high blanking speed and too much quantity is avoided, the cone pit is blocked and the materials are hardened, and the equipment can normally discharge underflow;
2. the control center acquires the working personnel on duty at the current time and marks the working personnel as the primary selection personnel, and acquires the management value of the primary selection personnel by combining the personnel distance, the total management duration, the working duration, the management times and the age; selecting the primary selection personnel with the largest management value as the management personnel of the feeding mechanism, and improving the adjusting efficiency of the feeding mechanism;
3. the differential pressure type transmitter is used for monitoring the pressure at the bottom of the deep cone concentrator in real time, and when the pressure at the bottom of the deep cone concentrator exceeds a preset pressure value, the control center controls the feeding mechanism to stop running; the phenomenon that excessive materials in the deep-cone and deep-cone concentrator block cone pits and harden the materials is avoided; the stable operation of the equipment is ensured; simultaneously combining the underflow flow, the underflow concentration and the pressure at the bottom of the deep cone thickener to obtain the discharge coefficient of the underflow; the control center controls the stirring mechanism to operate at a corresponding stirring frequency threshold value according to the discharge coefficient of the underflow; the conical roller and the stirring rod in the stirring mechanism can realize the introduction of water above the conical pit of the deep cone thickener into a high-concentration area of the conical pit, and the improvement of scraping, diluting and fluidity of over-concentrated or hardened materials in the conical pit is realized by combining the spiral scraper and the stirring blade, so that the effects of preventing the materials in the conical pit from hardening to block a bottom discharge port can be realized, and the effect of regulating the concentration of underflow can be realized to facilitate the discharge of underflow; the stirring frequency can be adjusted according to the requirements of different concentrated material properties and underflow concentration, the adaptability is wide, and the underflow discharge is convenient.
Drawings
In order to facilitate understanding for those skilled in the art, the present invention will be further described with reference to the accompanying drawings.
FIG. 1 is a schematic flow chart of the present invention.
Fig. 2 is a schematic structural view of the feeding mechanism of the present invention.
FIG. 3 is a schematic structural view of the stirring mechanism of the present invention.
In the figure: 1. a second motor; 2. a second motor shaft; 3. a tapered roller; 4. a support plate; 5. feeding a material box; 6. a storage hopper; 7. a feed inlet; 8. a support plate; 9. a first motor; 10. a feeding cylinder; 11. a main shaft; 12. a feeding auger; 13. a discharge port; 14. a stirring shaft; 15. a stirring rod; 16. scraping the strips; 17. a spiral scraper is arranged; 18. a lower spiral scraper; 19. positioning a rod; 20. a stirring blade.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1-3, a method for addressing deep cone thickener underflow drainage includes the following steps:
the method comprises the following steps: the feeding mechanism feeds the material into the deep cone thickener, and a feeding flowmeter, a feeding densimeter and a feeding concentration meter are arranged on the feeding mechanism; the feed flowmeter is used for monitoring the material flow sent into the deep cone thickener; the feeding densimeter is used for monitoring the density of the material fed into the deep cone thickener, and the feeding densimeter is used for monitoring the concentration of the material fed into the deep cone thickener;
step two: obtaining a feeding coefficient by combining the material flow, the material density and the material concentration; if the feeding coefficient exceeds/is lower than the preset coefficient threshold range, generating an early warning signal; the method comprises the following specific steps:
s21: marking the material flow as WL, the material density as WM and the material concentration as WN;
s22: setting a corresponding feeding preset value for each material type, matching the material type with all the material types to obtain the feeding preset value corresponding to the material type, and marking the feeding preset value as WS;
s23: normalizing the material flow, the material density, the material concentration and the feeding preset value and taking the numerical values;
obtaining a feed coefficient SC by using a formula SC ═ WL multiplied by A1+ WM multiplied by A2+ WN multiplied by A3) multiplied by WS-1.265, wherein A1, A2 and A3 are all preset proportionality coefficients;
step three: the control center receives the early warning signal and distributes corresponding managers to adjust the feeding mechanism, and the feeding coefficient is adjusted to be within a preset coefficient threshold range; materials can enter the deep cone thickener at a proper speed, the phenomenon that the materials are stacked in a deep cone pit due to too high blanking speed and too much quantity is avoided, the cone pit is blocked and the materials are hardened, and the equipment can normally discharge underflow; the specific distribution steps are as follows:
s31: acquiring workers working at the current time and marking the workers as primary selection workers;
s32: sending a position acquisition instruction to a mobile phone terminal of the primary selection personnel to acquire the position of the primary selection personnel, calculating the distance difference between the position of the primary selection personnel and the position of the feeding mechanism to obtain the personnel distance, and marking the personnel distance as J1;
s33: setting the total management time length of the primary selection personnel on the same day as G1;
calculating the time difference between the time of entry of the primary selected person and the current time of the system to obtain the time length of entry of the primary selected person and marking the time length as G2;
setting the age of the primary selected person as N1; setting the management times of the primary selection personnel as C1;
s34: carrying out normalization processing on the personnel distance, the total management duration, the working duration, the management times and the age, and taking the values; using formulas
s35: selecting the primary selection personnel with the maximum management value QW as the management personnel of the feeding mechanism; meanwhile, the management times of the manager are increased once;
s36: sending the position of the feeding mechanism to a mobile phone terminal of a manager; simultaneously marking the time of sending the position of the feeding mechanism as the position sending time;
s37: after arriving at the position of the feeding mechanism, a manager adjusts the feeding mechanism, and adjusts the feeding coefficient to be within a preset coefficient threshold value range; marking the time when the manager reaches the position of the feeding mechanism as the adjustment starting time;
s38: calculating the time difference between the position sending time and the adjusting starting time to obtain the buffer duration of the manager, and marking the buffer duration as TA;
calculating the time difference between the adjustment ending time and the adjustment starting time to obtain the single management time length of the manager, and marking the single management time length as TB;
summing the single management time length of the management personnel on the day to obtain the total management time length of the management personnel on the day; setting the score value input by a user as B;
obtaining a single value of a manager by using a formula SD which is 1/TA multiplied by h1+1/TB multiplied by h2+ B multiplied by h3, summing all the single values of the manager and averaging to obtain a mean value of the manager; wherein h1, h2 and h3 are all preset proportionality coefficients;
step four: the bottom of the deep cone thickener is provided with a differential pressure type transmitter, the differential pressure type transmitter is used for monitoring the pressure at the bottom of the deep cone thickener in real time, and when the pressure at the bottom of the deep cone thickener exceeds a preset pressure value, the control center controls the feeding mechanism to stop running; the excessive materials in the deep-cone and deep-cone concentrator are prevented, so that cone pits are blocked, the materials are hardened, and the stable operation of equipment is ensured;
step five: the discharge port of the deep cone thickener is provided with an underflow flow meter and an underflow concentration meter; the underflow flow meter is used for monitoring the flow rate of the discharged underflow, the underflow concentration meter is used for monitoring the concentration of the discharged underflow, and the discharge coefficient of the underflow is obtained according to the flow rate of the underflow, the concentration of the underflow and the pressure at the bottom of the deep cone thickener; the method specifically comprises the following steps:
s51: marking the underflow flow as DL, marking the underflow concentration as DN, and marking the pressure at the bottom of the deep cone concentrator as DY;
s52: setting a corresponding stirring preset value for each material type, matching the material type with all the material types to obtain a stirring preset value corresponding to the material type, and marking the stirring preset value as GS;
s23: carrying out normalization treatment on the underflow flow, the underflow concentration, the bottom pressure and the stirring preset value and taking the numerical values of the underflow flow, the underflow concentration, the bottom pressure and the stirring preset value;
obtaining a discharge coefficient DC by using a formula DC ═ 1/DL × B1+ DN × B2+ DY × B3) × GS, wherein B1, B2 and B3 are all preset proportionality coefficients;
step six: the control center controls the stirring mechanism to operate at a corresponding stirring frequency threshold value according to the discharge coefficient of the underflow, so that the underflow is conveniently discharged; the method specifically comprises the following steps:
s61: setting a plurality of stirring frequency thresholds and marking the thresholds as Km; m is 1, … …, j; k1< K2< … … < Kj; each stirring frequency corresponds to a preset discharge coefficient range which is sequentially (k1, k2, … …, (Km, Km + 1), when the DC belongs to (Km, Km + 1), the stirring frequency threshold corresponding to the preset discharge coefficient range is Km;
s62: and the control center controls the stirring mechanism to rotate according to the corresponding stirring frequency threshold value.
The feeding mechanism comprises a supporting plate 4 and a feeding box 5; a feeding box 5 is fixedly installed on the top end face of the supporting plate 4, a storage hopper 6 is fixedly installed on the upper portion of an inner cavity of the feeding box 5, a sealing cover is arranged on the top of the storage hopper 6 and used for preventing impurities outside the equipment from entering the feeding barrel 10 through the storage hopper 6 and polluting materials inside the feeding barrel 10, a feeding hole 7 is formed in the bottom of the storage hopper 6, an inclined feeding barrel 10 is arranged below the feeding hole 7 and inside the feeding box 5, the feeding hole 7 is communicated with the feeding barrel 10, and a main shaft 11 is arranged inside the feeding barrel 10; the included angle between the feeding cylinder 10 and the horizontal plane is 30-45 degrees;
a feeding auger 12 is arranged on the main shaft 11, a gap is reserved between the side edge of the feeding auger 12 and the inner wall of the feeding cylinder 10, the feeding auger 12 performs uniform blanking on materials when rotating, one end of the main shaft 11 is fixedly connected with the output end of a first motor 9 through a coupler, the first motor 9 is used for driving the main shaft 11 to rotate, so that the rotating feeding auger 12 is used for performing uniform blanking, and the other end of the main shaft 11 is movably connected with the inner side wall of the feeding cylinder 10 through a bearing;
a support plate 8 is fixedly arranged at the bottom of the inner cavity of the feeding box 5, and the plane of the support plate 8 is vertical to the main shaft 11; the first motor 9 is fixedly arranged on the support plate 8, one end of the feeding cylinder 10, which is far away from the first motor 9, penetrates through the side wall of the feeding box 5 and extends to the outer side of the feeding box 5, and the outer end of the feeding cylinder 10 is communicated with a discharge hole 13; the bottom of the discharge port 13 penetrates through the inner top wall of the deep cone thickener and extends to the interior of the deep cone thickener;
the stirring mechanism comprises a second motor 1; the second motor 1 is fixedly arranged at the top of the deep cone thickener; the output end of the second motor 1 is fixedly provided with a second motor shaft 2, and the bottom of the second motor shaft 2 penetrates through the inner top wall of the deep cone thickener and extends into the deep cone thickener; the bottom of the second motor shaft 2 is fixedly provided with a conical roller 3, two sides of the outer surface of the conical roller 3 are fixedly provided with evenly distributed stirring rods 15, a scraping strip 16 is fixedly arranged between one ends of the evenly distributed stirring rods 15 far away from the conical roller 3, and the bottoms of the two scraping strips 16 are inclined towards the direction close to the conical roller 3; the material can be stirred by the arranged stirring rod 15, and meanwhile, the scraping strip 16 can scrape the material on the inner wall of the conical box body, so that the material is prevented from being adhered to the inner wall of the conical box body, and the material is difficult to clean after the material discharge is finished;
the bottom of the conical roller 3 is fixedly provided with a stirring shaft 14, and the stirring shaft 14 is connected with the conical roller through a connecting flange; the bottom of the stirring shaft 14 is sequentially provided with an upper spiral scraper 17, a positioning rod 19, a lower spiral scraper 18 and a stirring blade 20; the positioning rod 19 is used for ensuring the running stability of the stirring shaft 14, a spiral scraper is respectively arranged above and below the positioning rod 19, a stirring blade 20 is arranged at the lowest part of the stirring shaft 14, the spiral scraper can upwards scrape materials which are too thick and are to be hardened or are hardened when rotating, and the stirring blade 20 loosens the materials, so that the shearing force of the concentrated materials is reduced, and the deep cone thickener can prevent the materials at the bottom from being hardened, can reach the required concentration and is easy to discharge; meanwhile, the conical roller 3 and the stirring rod 15 can guide water above the conical pit of the deep cone thickener into a high-concentration area of the conical pit, and the improvement effects of scraping, diluting and flowability of excessively-concentrated or hardened materials in the conical pit are realized by combining the spiral scraper and the stirring blade 20, so that the conical pit materials are prevented from being hardened to block a bottom discharge port, and the effect of regulating the underflow concentration can be realized.
The working principle of the invention is as follows:
a method for solving the bottom flow discharge of a deep cone thickener comprises the following steps that when the deep cone thickener works, a feeding mechanism feeds materials into the deep cone thickener, and a feeding flowmeter, a feeding densimeter and a feeding densimeter are arranged on the feeding mechanism; the feed flowmeter is used for monitoring the material flow sent into the deep cone thickener; the feeding densimeter is used for monitoring the density of the material fed into the deep cone thickener, and the feeding densimeter is used for monitoring the concentration of the material fed into the deep cone thickener; obtaining a feeding coefficient by combining the material flow, the material density and the material concentration; if the feeding coefficient exceeds/is lower than the preset coefficient threshold range, generating an early warning signal; the control center receives the early warning signal and distributes corresponding managers to adjust the feeding mechanism, and the feeding coefficient is adjusted to be within a preset coefficient threshold range; materials can enter the deep cone thickener at a proper speed, the phenomenon that the materials are stacked in a deep cone pit due to too high blanking speed and too much quantity is avoided, the cone pit is blocked and the materials are hardened, and the equipment can normally discharge underflow;
the bottom of the deep cone thickener is provided with a differential pressure type transmitter, the differential pressure type transmitter is used for monitoring the pressure at the bottom of the deep cone thickener in real time, and when the pressure at the bottom of the deep cone thickener exceeds a preset pressure value, the control center controls the feeding mechanism to stop running; the excessive materials in the deep-cone and deep-cone concentrator are prevented, so that cone pits are blocked, the materials are hardened, and the stable operation of equipment is ensured; the discharge port of the deep cone thickener is provided with an underflow flow meter and an underflow concentration meter; the underflow flow meter is used for monitoring the flow rate of the discharged underflow, the underflow concentration meter is used for monitoring the concentration of the discharged underflow, and the discharge coefficient of the underflow is obtained according to the flow rate of the underflow, the concentration of the underflow and the pressure at the bottom of the deep cone thickener; the control center controls the stirring mechanism to operate at a corresponding stirring frequency threshold value according to the discharge coefficient of the underflow, the action of the conical roller 3 and the stirring rod 15 in the stirring mechanism can realize the purpose of introducing water above the conical pit of the deep cone thickener into a high-concentration area of the conical pit, and the improvement effects of scraping, diluting and flowability of over-concentrated or hardened materials in the conical pit are realized by combining the spiral scraper and the stirring blade 20, so that the blockage of the discharge port at the bottom by the hardened materials in the conical pit can be prevented, and the effect of adjusting the concentration of the underflow can be realized to facilitate the discharge of the underflow; the stirring frequency can be adjusted according to the requirements of different concentrated material properties and underflow concentration, the adaptability is wide, and the underflow discharge is convenient.
The above formulas are all obtained by collecting a large amount of data to perform software simulation and performing parameter setting processing by corresponding experts, and the formulas are in accordance with real results.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise forms disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (6)
1. A method for solving the problem of underflow discharge of a deep cone thickener is characterized by comprising the following steps:
the method comprises the following steps: the feeding mechanism feeds the material into the deep cone thickener, and a feeding flowmeter, a feeding densimeter and a feeding concentration meter are arranged on the feeding mechanism; the feed flowmeter is used for monitoring the material flow sent into the deep cone thickener; the feeding densimeter is used for monitoring the density of the material fed into the deep cone thickener, and the feeding densimeter is used for monitoring the concentration of the material fed into the deep cone thickener;
step two: obtaining a feeding coefficient by combining the material flow, the material density and the material concentration; if the feeding coefficient exceeds/is lower than the preset coefficient threshold range, generating an early warning signal;
step three: the control center receives the early warning signal and distributes corresponding managers to adjust the feeding mechanism, and the feeding coefficient is adjusted to be within a preset coefficient threshold range;
step four: the bottom of the deep cone thickener is provided with a differential pressure type transmitter, the differential pressure type transmitter is used for monitoring the pressure at the bottom of the deep cone thickener in real time, and when the pressure at the bottom of the deep cone thickener exceeds a preset pressure value, the control center controls the feeding mechanism to stop running;
step five: the discharge port of the deep cone thickener is provided with an underflow flow meter and an underflow concentration meter; the underflow flow meter is used for monitoring the flow rate of the discharged underflow, the underflow concentration meter is used for monitoring the concentration of the discharged underflow, and the discharge coefficient of the underflow is obtained by combining the flow rate of the underflow, the concentration of the underflow and the pressure at the bottom of the deep cone thickener;
step six: the control center controls the stirring mechanism to operate at a corresponding stirring frequency threshold value according to the discharge coefficient of the underflow; the method specifically comprises the following steps:
s61: setting a plurality of stirring frequency thresholds and marking the thresholds as Km; m is 1, … …, j; k1< K2< … … < Kj; each stirring frequency corresponds to a preset discharge coefficient range which is sequentially (k1, k2, … …, (Km, Km + 1), when the DC belongs to (Km, Km + 1), the stirring frequency threshold corresponding to the preset discharge coefficient range is Km;
s62: and the control center controls the stirring mechanism to rotate according to the corresponding stirring frequency threshold value.
2. The method for solving the underflow discharge of the deep cone thickener according to claim 1, wherein the specific calculation method of the feeding coefficient in the second step is as follows:
s21: marking the material flow as WL, the material density as WM and the material concentration as WN;
s22: setting a corresponding feeding preset value for each material type, matching the material type with all the material types to obtain the feeding preset value corresponding to the material type, and marking the feeding preset value as WS;
s23: normalizing the material flow, the material density, the material concentration and the feeding preset value and taking the numerical values;
the feed coefficient SC is obtained by using the formula SC ═ WL × a1+ WM × a2+ WN × A3) × WS-1.265, where a1, a2 and A3 are all preset proportionality coefficients.
3. The method for solving the underflow discharge of the deep cone thickener according to claim 1, wherein the specific distribution step in the third step is as follows:
s31: acquiring workers working at the current time and marking the workers as primary selection workers;
s32: sending a position acquisition instruction to a mobile phone terminal of the primary selection personnel to acquire the position of the primary selection personnel, calculating the distance difference between the position of the primary selection personnel and the position of the feeding mechanism to obtain the personnel distance, and marking the personnel distance as J1;
s33: setting the total management time length of the primary selection personnel on the same day as G1;
calculating the time difference between the time of entry of the primary selected person and the current time of the system to obtain the time length of entry of the primary selected person and marking the time length as G2;
setting the age of the primary selected person as N1; setting the management times of the primary selection personnel as C1;
s34: carrying out normalization processing on the personnel distance, the total management duration, the working duration, the management times and the age, and taking the values;
using formulas
Acquiring a management value QW of the primary selection personnel; wherein d1, d2, d3, d4 and d5 are all preset coefficient factors; β 0.00544321; eta is an equilibrium coefficient, and the value is 1.356855; LX is the mean value of the first-selected personnel;
s35: selecting the primary selection personnel with the maximum management value QW as the management personnel of the feeding mechanism; meanwhile, the management times of the manager are increased once;
s36: sending the position of the feeding mechanism to a mobile phone terminal of a manager; simultaneously marking the time of sending the position of the feeding mechanism as the position sending time;
s37: after arriving at the position of the feeding mechanism, a manager adjusts the feeding mechanism, and adjusts the feeding coefficient to be within a preset coefficient threshold value range; marking the time when the manager reaches the position of the feeding mechanism as the adjustment starting time;
s38: calculating the time difference between the position sending time and the adjusting starting time to obtain the buffer duration of the manager, and marking the buffer duration as TA;
calculating the time difference between the adjustment ending time and the adjustment starting time to obtain the single management time length of the manager, and marking the single management time length as TB;
summing the single management time length of the management personnel on the day to obtain the total management time length of the management personnel on the day; setting the score value input by a user as B;
obtaining a single value of a manager by using a formula SD which is 1/TA multiplied by h1+1/TB multiplied by h2+ B multiplied by h3, summing all the single values of the manager and averaging to obtain a mean value of the manager; wherein h1, h2 and h3 are all preset proportionality coefficients.
4. The method for solving the underflow discharge of the deep cone thickener according to claim 1, wherein the specific calculation method of the discharge coefficient of the underflow in the fifth step is as follows:
s51: marking the underflow flow as DL, marking the underflow concentration as DN, and marking the pressure at the bottom of the deep cone concentrator as DY;
s52: setting a corresponding stirring preset value for each material type, matching the material type with all the material types to obtain a stirring preset value corresponding to the material type, and marking the stirring preset value as GS;
s23: carrying out normalization treatment on the underflow flow, the underflow concentration, the bottom pressure and the stirring preset value and taking the numerical values of the underflow flow, the underflow concentration, the bottom pressure and the stirring preset value;
the discharge coefficient DC is obtained by using the formula DC ═ 1/DL × B1+ DN × B2+ DY × B3) × GS, where B1, B2 and B3 are all preset proportionality coefficients.
5. The method of solving deep cone thickener underflow discharge as set forth in claim 1 wherein said feed mechanism comprises a support plate (4) and a top feed tank (5); a feeding box (5) is fixedly mounted on the top end face of the supporting plate (4), a storage hopper (6) is fixedly mounted on the upper portion of an inner cavity of the feeding box (5), a sealing cover is arranged at the top of the storage hopper (6), a feeding hole (7) is formed in the bottom of the storage hopper (6), an inclined feeding barrel (10) is arranged below the feeding hole (7) and inside the feeding box (5), the feeding hole (7) is communicated with the feeding barrel (10), and a main shaft (11) is arranged inside the feeding barrel (10); the included angle between the feeding cylinder (10) and the horizontal plane is 30-45 degrees;
a feeding packing auger (12) is mounted on the main shaft (11), a gap is reserved between the side edge of the feeding packing auger (12) and the inner wall of the feeding barrel (10), one end of the main shaft (11) is fixedly connected with the output end of the first motor (9) through a coupler, and the other end of the main shaft (11) is movably connected with the inner side wall of the feeding barrel (10) through a bearing;
a support plate (8) is fixedly arranged at the bottom of the inner cavity of the feeding box (5), and the plane where the support plate (8) is located is vertical to the main shaft (11); the first motor (9) is fixedly arranged on the support plate (8), one end, far away from the first motor (9), of the feeding cylinder (10) penetrates through the side wall of the feeding box (5) and extends to the outer side of the feeding box (5), and the outer end of the feeding cylinder (10) is communicated with a discharge hole (13); the bottom of the discharge hole (13) penetrates through the inner top wall of the deep cone thickener and extends to the interior of the deep cone thickener.
6. A method of addressing deep cone thickener underflow discharge according to claim 1 wherein the agitation mechanism comprises a second motor (1); the second motor (1) is fixedly arranged at the top of the deep cone thickener; a second motor shaft (2) is fixedly installed at the output end of the second motor (1), and the bottom of the second motor shaft (2) penetrates through the inner top wall of the deep cone thickener and extends into the deep cone thickener; the bottom of the second motor shaft (2) is fixedly provided with a conical roller (3), two sides of the outer surface of the conical roller (3) are fixedly provided with uniformly distributed stirring rods (15), a scraping strip (16) is fixedly arranged between one ends, far away from the conical roller (3), of the uniformly distributed stirring rods (15), and the bottoms of the two scraping strips (16) are inclined towards the direction close to the conical roller (3);
the bottom of the conical roller (3) is fixedly provided with a stirring shaft (14), and the stirring shaft (14) is connected with the conical roller by a connecting flange; the bottom of the stirring shaft (14) is sequentially provided with an upper spiral scraper (17), a positioning rod (19), a lower spiral scraper (18) and stirring blades (20).
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