CN111921848A - Screening method for ore detection - Google Patents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/28—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/42—Drive mechanisms, regulating or controlling devices, or balancing devices, specially adapted for screens
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
- B07B1/4609—Constructional details of screens in general; Cleaning or heating of screens constructional details of screening surfaces or meshes
- B07B1/4663—Multi-layer screening surfaces
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B2201/00—Details applicable to machines for screening using sieves or gratings
- B07B2201/04—Multiple deck screening devices comprising one or more superimposed screens
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Abstract
The invention provides a screening method for ore detection, which is implemented by a screening system for ore detection and comprises the following steps: 1, allowing ores in an ore bin to fall into an ore vibrating screen through a sector valve; step 2, after screening, discharging oversize materials with the particle size larger than 5mm into an ore weighing funnel under the control of an ore belt conveyor through an electric turning plate; step 3, conveying the ore chutes to a skip car respectively for thickness detection; and 4, conveying the undersize products with the particle size of less than 5mm to a fine ore bin by three belt conveyors and then carrying out centralized treatment. The ore vibrating screen comprises a vibrator, a screen box, each ballast device and a transmission device, wherein a screen frame is welded in a box manner, wear-resistant lining plates are additionally arranged on the inner walls of two sides of the screen frame, the screen mesh adopts a metal carbide load comb tooth screen plate, a screen bottom frame adopts rubber springs for vibration reduction, the screen mesh is arranged in a comb tooth manner, the feeding side is wide, the discharging side is narrow, a material collecting hopper is arranged as a vibration participating body and is connected with the screen body through bolts, and a layer of wear-resistant buffer net is additionally arranged at; the rubber spring is directly driven by the motor through flexible connection to drive the eccentric shaft.
Description
Technical Field
The invention relates to the field of ore detection and analysis methods, in particular to a screening method for ore detection.
Background
The screening is an operation of dividing the mixed materials with different particle sizes into various particle sizes by using a perforated screen surface. The screening operation is divided into five categories:
and (3) independently screening: in obtaining end products suitable for the user's requirements, such as stone crushing;
auxiliary screening: the fine material screening device is used for the crushing operation of a concentrating mill, has an auxiliary effect on the crushing operation and comprises pre-screening and inspection screening, wherein the pre-screening is a screening effect before ores enter a crusher, fine materials in the ores are screened out in advance, the ores are prevented from being excessively crushed, the amount of the ores entering the crusher is reduced, the fluidity of the ores in a crushing cavity is increased, and the fine material screening device is used for avoiding the fine materials from blocking the crusher before crushing and fine crushing; the inspection screening is used for screening out the crushed products with the particle size larger than a specific size fraction and returning the crushed products to the crusher for re-crushing so as to control the final particle size of the crushed products;
preparing and screening: preparing for next-stage operation, for example, screening and grading materials before grading and eliminating in a gravity concentration plant, and grading and eliminating different products with different thicknesses;
selecting and screening: if the distribution difference of useful components in the material in each grade is large, the useful components can be screened and classified to obtain the grades with different qualities, the low-quality grades are screened out, and the grade of the material is improved;
dewatering/desliming and screening: and removing moisture or cement from the materials.
Associated with ore detection should be secondary screening as well as selective screening. In the process of ore mining, sampling, sample preparation and particle size determination are required to be carried out on bulk ore products, the current national standard in China adopts a manual screening method, the adopted screen holes are square screen holes, 200mm circular screens are adopted when the maximum particle size of the screen frame is regulated to be 5.6mm or less in shape and size, ores with the maximum particle size larger than 5.6mm are adopted, and the shape and size of the screen frame are not regulated. The sieve needs to be checked and checked for the size of sieve holes before use, and the used weighing apparatus is maximally weighed to be close to the sample amount for sieving, and is allowed to be weighed in a grading manner. The screening method comprises the following steps:
1. sample loading amount: determining the maximum sample loading amount according to the size of the sieve pores, the area of the sieve and the maximum granularity of the sample;
2. placing the samples for screening with the sample loading amount less than the maximum sample loading amount in a sieve with specified aperture, simultaneously sieving by using a plurality of sieves with different aperture, and sequentially arranging according to the sizes of sieve pores from top to bottom;
3. during screening, a screen cover and a screen chassis are added for placing and dissipating dust;
4. the hand-held sieve device is horizontally shaken in a reciprocating way, the granularity is prevented from changing, the frequency is about 60 times per minute, the amplitude is about 70mm, and the sieve is sieved until no ore falls off the sieve basically.
5. And (4) screening the end point: and (5) continuing to sieve for 1 minute, wherein the sieving end point is that the sieved ore does not exceed 0.1 percent of the sample loading amount.
6. And respectively weighing each granularity sample after screening.
7. When screening particles above 50mm, the residual ore on the screen can be tried by hand and the large particles measured using a square gauge of the corresponding size.
Although the national standard states that the mechanical screening method is checked by the manual screening method, no significant difference is proved to be usable, and the screening condition of the screening machine is determined according to the test result. However, at present, no systematic mechanical screening method is available for solving the problem of extremely low manual screening efficiency.
In addition, the current screening device arranged under the ore tank has the powder content expressed by screening index (%) less than 5mm, and the ore vibrating screen has the following problems:
1. the ore screen sifter inclination is little, and the material stimulated antedisplacement speed is slow, and the detention time on the sifter is long, is unfavorable for the material layering, and the clearance that is difficult for piercing through between the large granule material of tiny particle promptly moves down, contacts the wire side, and bed of material thickness is about 150mm, is equivalent to partial tiny particle material and has left the shale shaker before basic wire side, reduces bed of material thickness like the manual feed bin gate of copper drum, must increase shale shaker operating time, direct influence blast furnace production.
2. The material layer is too thick, the load of the vibrating screen is increased, and the vibration strength is reduced along with the increase.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a screening method for ore detection, which is implemented by a screening system for ore detection, and comprises the following steps:
1, allowing ores in an ore bin to fall into an ore vibrating screen through a sector valve;
step 2, after screening, discharging oversize materials with the particle size larger than 5mm into an ore weighing funnel under the control of an ore belt conveyor through an electric turning plate;
step 3, the ore chutes are respectively conveyed to a skip car for detection;
and 4, conveying the undersize products with the particle size of less than 5mm to a fine ore bin by three belt conveyors and then carrying out centralized treatment.
Preferably, the ore bin is 10, raw materials number of products is no less than to ore bin number, will every the position of two original material mouths on the ore bin changes into a material mouth, adds and establishes normally open fan-shaped valve, fan-shaped valve adopts manual opening and closing.
Preferably, the ore vibrating screen is 10, the model is DSY1228, the screening capacity is Q equal to 300t/h, the ore vibrating screen comprises a vibrator, a screen box, a vibration isolation device and a transmission device, the screen frame is welded in a box type, wear-resistant lining plates are additionally arranged on the inner walls of two sides, the screen mesh is a metal carbide load comb tooth screen plate, the screen bottom frame is damped by a rubber spring, the screen mesh is arranged in a comb tooth shape, the feeding side is wide, the discharging side is narrow, the collecting hopper is a vibration participating body and is connected with the screen body through a bolt, and a layer of wear-resistant buffer net is additionally arranged at the joint; the damping spring adopts a rubber spring, an eccentric shaft is directly driven by a motor through flexible connection, two groups of bars with the same diameter and different lengths are arranged in parallel and crossed at equal intervals, one end of the parallel and level is fixed on a cross beam, a cantilever at the other end is in a free state to form a group of cantilever elastic screen meshes, the plurality of groups of cantilever elastic screen meshes take the cross beam as a head, the free ends are tails, the cantilever elastic screen meshes are obliquely arranged according to the step shape from bottom to top in an overlapping way from head to tail to form a series of cantilever elastic screen surfaces, materials enter from the head end of an upper group and exit from the; materials on the screen are borne by the bars, the movement directions of the bars and the materials are the same, the sieve pores formed among the bars are long-strip-shaped with open tail ends, and if a critical particle is blocked, the material is easy to fall off from the open ends of the strip-shaped sieve pores under the flushing of other materials; when the screen works, the cantilever bars vibrate for the second time besides vibrating together with the screen box, so that the amplitude is amplified, and the screening efficiency is improved; the bar vibration range is related to diameter, length, when the excited produces secondary vibration, the geometric dimension of rational selection bar, the shape size of sieve mesh constantly high frequency change, further avoid the card of critical particle to block, there is certain vertical distance between upper and lower two sets of screens, when sieving, the material is thrown many times, in the use, sieve case and sifting surface are under the effect of vibrator, produce circular, the vibration of ellipse or straight line orbit, the vibration of sifting surface makes the material layer on the sifting surface loose and leaves the sifting surface and throws, make the fine fraction can see through the bed of material whereabouts and discharge through the sieve mesh, and will block the granule oscillation play in the sieve mesh, except producing the screening effect, make the material move forward.
Preferably, on the premise of ensuring the feeding speed, the material layer is controlled to be the thinnest so as to obviously improve the screening efficiency.
Preferably, the ore belt conveyor is one, the belt width B is 1000mm, the belt speed V is 2.0m/s, the material conveying capacity Q is 900t/h, the horizontal projection length is about 7300mm, and the inclination angle is less than 13 degrees, and the ore belt conveyor is used for conveying ore larger than 5mm on a screen and sending the ore to an ore weighing hopper in front of a skip car.
Preferably, the number of the ore powder belt conveyors is three, the ore powder belt conveyors are used for conveying ore powder with the undersize of less than or equal to 5mm to an ore powder bin, the belt width B is 500mm, the belt speed V is 1.6m/s, and the conveying capacity Q is 200 t/h.
Preferably, the powder bin is of a steel plate welding structure, the volume of the powder bin depends on the powder ore amount and the powder ore cleaning requirement, the powder bin is of a steel structure square bin, the theoretical volume of the powder bin is 58 cubic meters, and a lower bin opening is connected with a manual fan-shaped valve.
Preferably, the screening method for ore detection is characterized in that the screening system for ore detection further comprises a gate and a flap electrohydraulic push rod, the electrohydraulic push rod takes a hydraulic cylinder as a main body, an assembly formed by combining an oil pump, a motor, an oil tank, an oil filter and a hydraulic control valve is arranged on the same axis or on different axes according to requirements, the oil tank and a mounting support are arranged in the middle, the piston rod can move back and forth only by switching on a control power supply of the motor, the extension and retraction of the piston rod are controlled by the forward and reverse rotation of the motor, when the electrohydraulic push rod works, when the piston rod is subjected to external force exceeding regulated output force or the piston still rotates to a terminal motor, the oil pressure in an oil path is increased to regulated pressure, the overflow valve overflows to realize overload protection, the motor cannot be burnt out even if rotating, and the electrohydraulic push rod is in an oil path integrated block, the pressure self-locking mechanism is arranged, the motor stops, the piston rod can be self-locked at a certain position, and the pressure maintaining state is achieved. The electro-hydraulic push rod replaces an air cylinder and an electric push rod, the hydraulic control of the system gate saves devices such as a mechanical connection electric control master, a band-type brake and the like, the system gate is stable and reliable, the opening and closing time of the gate plate is accurate, the stroke adjustment and control are convenient, the limiting device adopts a rigid connecting rod and a proximity switch, the signal transmission degree is high, and the system is suitable for remote operation.
Preferably, the screening method for ore detection is characterized in that the screening system for ore detection further comprises a material weighing electronic scale, the material weighing electronic scale adopts a pressure type digital sensor, three sensors are arranged on the upper part of each weighing hopper in an angle mode to bear the vertical pressure of materials, conversion signals are converted into digital display, and interlocking signals are generated through a microcomputer and other equipment to achieve accurate linkage, an operation chamber used for detection is provided with a mathematical display screen for electronic weighing of the weighing hoppers, an adjusting button is arranged below the operation chamber, an operator manually adjusts a set value according to needs, and is provided with a singlechip control device and a batch printer to achieve automatic compensation of charging material weighing and automatic printing of charging records.
Preferably, the screening method for ore detection is characterized in that the screening system for ore detection also comprises two ore weighing hoppers, the capacity of which is 2.8 cubic meters and the weight of ore is not more than 3.5t, and the ore weighing electronic scale is matched with the two ore weighing hoppers; the ore weighing funnel adopts a steel plate welding structure with a manganese steel plate lining, the thickness of a steel plate shell is 12mm, and the thickness of the manganese steel plate lining is 24 mm. The effective volume of the ore weighing funnel is consistent with that of the skip car, and the included angle between the intersection line of the bottom plate and the side plate of the funnel and the chute and the horizontal plane is not less than 45 degrees; the discharge opening and the chute of the funnel are matched with the size of the skip opening, and the width of the upper opening of the weighing funnel is matched with the width of the belt conveyor.
The invention has the beneficial effects that:
according to the screening method, the vibrating screen with higher screening efficiency is used, the thickness of the material loading layer of the vibrating screen is controlled on the premise of ensuring the feeding speed, the screening efficiency is improved, the requirements of high-precision detection of ore granularity, particle size and the like are met, and the ore utilization coefficient is improved.
Drawings
Some specific embodiments of the invention will be described in detail hereinafter, by way of illustration and not limitation, with reference to the accompanying drawings. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. The objects and features of the present invention will become more apparent in view of the following description taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a flow diagram of a method according to an embodiment of the invention.
Detailed Description
The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.
Referring to fig. 1, the screening method for ore testing, which is implemented by the screening system for ore testing, includes the following steps:
1, allowing ores in an ore bin to fall into an ore vibrating screen through a manual fan-shaped valve;
step 2, after screening, discharging oversize materials with the particle size larger than 5mm into an ore weighing funnel under the control of an ore belt conveyor through an electric turning plate;
step 3, the ore chutes are respectively conveyed to a skip car for detection;
and 4, conveying the undersize products with the particle size of less than 5mm to a fine ore bin by three belt conveyors and then carrying out centralized treatment.
In this embodiment, there are 10 ore positions, and the general requirements of ore bin configuration are: the number of ore bins is not less than the number of raw material products, 2-3 bins are arranged for ore with more general consumption to avoid overlarge capacity of a single bin, the capacity of the ore bins is determined according to the incoming material transport distance and the transport period, 2 times of the capacity of the furnace top bin is suitable generally, and the minimum capacity is not less than the capacity of the furnace top bin. In order to facilitate the maintenance and replacement of the screen surface of the vibrating screen, two original material nozzles on each bin are cancelled, changed into one material nozzle, and additionally provided with a normally open manual fan-shaped valve.
The single fan-shaped valve is opened and closed manually. The ore vibrating screen is 10, the model is DSY1228, and the screening capacity is 300 t/h. The sieve frame of the ore vibrating sieve is welded in a box shape, the inner walls of two sides of the sieve frame are additionally provided with wear-resistant lining plates, and the sieve mesh is a metal carbide load comb sieve plate, so that the service life is prolonged; the screen bottom frame adopts the rubber spring to reduce vibration, thereby increasing the vibration stability of the screen body, reducing mechanical movement noise, having reliable operation and small maintenance amount; the screen mesh area is large, the screen mesh is arranged in a comb shape, the feeding side is wide, the discharging side is narrow, the screening efficiency is high, the ore return belt conveyor is convenient to install and maintain, and the collecting hopper is arranged as a vibration body and is connected with the screen body through a bolt; in order to reduce impact abrasion at the material receiving part of the screen and prolong the service life of the screen, a layer of wear-resistant buffer net is additionally arranged at the position; the damping spring adopts a rubber spring, so that the vibration absorption capacity is high, the vibration noise is low, the eccentric shaft is directly driven by the motor through flexible connection, the vibration exciting force is increased compared with a screen body in a triangular belt transmission mode, the screening efficiency is improved, and the powder content is reduced; two groups of rods with the same diameter and different lengths are arranged in parallel and crossed at equal intervals, one end of the parallel and level is fixed on a cross beam, and a cantilever at the other end is in a free state to form a group of cantilever elastic screen meshes; materials on the screen are borne by the bars, the movement directions of the bars and the materials are the same, the movement resistance loss of the materials is small, the screening capacity is improved, and the abrasion of the bars is slowed down; the sieve pores formed among the bars are long strips with open tail ends, and if the critical particles are blocked, the critical particles can easily fall off from the open ends of the strip sieve pores under the flushing of other materials; when the screen works, the cantilever bars vibrate for the second time besides vibrating together with the screen box, so that the amplitude is amplified, and the screening efficiency is improved; the vibration amplitude of the bars is related to the diameter and the length, when the bars are excited to generate secondary vibration, the geometric dimension of the bars is reasonably selected, the shape and the dimension of the sieve pores are changed at high frequency continuously, the blocking of critical particles is further avoided, a certain vertical distance exists between the upper and the lower groups of sieve meshes, and when the bars are sieved, the materials are thrown for multiple times, so that the conveying of the materials is facilitated, and the sieving efficiency is improved.
In the use, the shale shaker includes vibrator, sieve case, vibration isolation device and transmission, and sieve case and sifter produce circular, oval or straight line orbit's vibration under the effect of vibrator, and the vibration of sifter makes the material layer on the sifter loose and leave the sifter and throw, makes the fine grit level can see through the material layer whereabouts and discharge through the sieve mesh to shake out the granule that will block in the sieve mesh, except producing the screening effect, make the material move forward.
In this embodiment, the moving speed of the material on the screen surface is 0.305m/s, the thickness of the material is 60mm, the effective area is 3.12 square meters, the bulk density of the ore is 1.7 tons/cubic meter, the content of the material larger than the size of the screen hole is 85%, the mass of the material with the size of the screen hole in the feeding process in unit time is 297 tons/hour, and on the premise of ensuring the feeding speed, the material layer is controlled to be thinnest, so that the screening efficiency can be obviously improved.
The ore belt conveyor is additionally provided, the belt width B is 1000mm, the belt speed V is 2.0m/s, the material conveying capacity Q is 900t/h, the horizontal projection length is about 7300mm, the inclination angle is less than 13 degrees, and the ore belt conveyor is used for conveying ore larger than 5mm on a screen and sending the ore to an ore weighing hopper in front of a skip car.
And three ore powder belt conveyors are additionally arranged and used for conveying ore powder with the undersize of less than or equal to 5mm to an ore powder bin, the belt width B is 500mm, the belt speed V is 1.6m/s, and the conveying capacity Q is 200 t/h.
The powder storehouse is steel sheet welded structure, and its volume size depends on powder ore volume and powder ore clearance requirement, selects for use steel construction square storehouse according to the requirement this embodiment, and theoretical volume 58 cubic meters, lower bin mouth connect one manual fan-shaped valve.
The screening method for ore detection comprises the following steps that a screening system for ore detection further comprises a gate and a turning plate electro-hydraulic push rod, and the control of the gate and the turning plate electro-hydraulic push rod comprises the following steps:
the electro-hydraulic push rod is a novel electro-hydraulic mechanism integrating mechanical and electro-hydraulic, and is an assembly with a hydraulic cylinder as a main body and an oil pump, a motor, an oil tank, an oil filter and a hydraulic control valve combined together. The motor, the oil pump, the hydraulic control valve and the hydraulic cylinder are arranged on the same axis or on different axes according to requirements, the oil tank and the mounting support are arranged in the middle, the piston rod can move in a reciprocating mode only by switching on a control power supply of the motor, and the expansion and contraction of the piston rod are controlled by the forward and reverse rotation of the motor. When the electro-hydraulic push rod works, when the external force borne by the piston rod exceeds the set output force or the motor still rotates when the piston reaches the end point, the oil pressure in the oil way is increased to the set pressure, the overflow valve quickly and accurately overflows to realize overload protection, and the motor cannot be burnt out although rotating. The oil circuit integrated block of the electro-hydraulic push rod is provided with a pressure self-locking mechanism, the motor stops, and the piston rod can be self-locked at a certain position and is in a pressure maintaining state. The electro-hydraulic push rod replaces an air cylinder and an electric push rod, the hydraulic control of the system gate saves devices such as a mechanical connection electric control master, a band-type brake and the like, the system gate is stable and reliable, the opening and closing time of the gate plate is accurate, the stroke adjustment and control are convenient, the limiting device adopts a rigid connecting rod and a proximity switch, the signal transmission degree is high, and the system is suitable for remote operation.
The screening method for ore detection is characterized in that an ore detection screening system further comprises a material weighing electronic scale, three sensors are arranged on the upper portion of each weighing hopper in an arrangement mode through pressure type digital sensors, vertical pressure of materials is borne, conversion signals are displayed in a digital mode, and interlocking signals are generated through a microcomputer and other equipment, so that accurate linkage is achieved. The operation room under the groove is provided with a mathematical display screen for weighing hopper electronic weighing, an adjusting button is arranged under the operation room, an operator manually adjusts a set value according to needs, batch change and special detection material adjustment are facilitated, and the operation room under the groove is provided with a single chip microcomputer control device and a batch printer, so that automatic compensation of charging material weighing and automatic printing of charging record are realized.
The screening method for ore detection comprises the step that the screening system for ore detection also comprises two ore weighing hoppers, the volume of which is 2.8 cubic meters and the ore weight of which is not more than 3.5t, and the two ore weighing hoppers are matched with the material weighing electronic scale, and a steel plate welding structure with a manganese steel plate lining is adopted, the thickness of a steel plate shell is 12mm, and the thickness of the manganese steel plate lining is 24 mm. The effective volume of the ore weighing hopper is consistent with that of the skip car; in order to ensure that ores can smoothly leak into the skip car and prevent the accumulation of the ores in the hopper, the included angle between the intersection line of the bottom plate and the side plate of the hopper and the chute and the horizontal plane is not less than 45 degrees; the discharge opening and the chute of the funnel are matched with the opening of the skip car in size, so that when the skip car is in a normal parking position, ores are completely leaked into the skip car and cannot splash out of the skip car, the width of the upper opening of the weighing funnel is matched with the width of the belt conveyor,
according to the screening method, the vibrating screen with higher screening efficiency is used, the thickness of the material loading layer of the vibrating screen is controlled on the premise that the feeding speed is guaranteed, the screening efficiency is improved, the requirements of high-precision detection of ore granularity, particle size and the like are met, and the ore utilization coefficient is improved.
While the present invention has been described with reference to the particular illustrative embodiments, it is not to be restricted by the embodiments but only by the appended claims. It will be understood by those skilled in the art that variations and modifications of the embodiments of the present invention can be made without departing from the scope and spirit of the invention.
Claims (10)
1. A screening method for ore detection, which is implemented by a screening system for ore detection, comprising the steps of:
1, allowing ores in an ore bin to fall into an ore vibrating screen through a sector valve;
step 2, after screening, discharging oversize materials with the particle size larger than 5mm into an ore weighing funnel under the control of an ore belt conveyor through an electric turning plate;
step 3, the ore chutes are respectively conveyed to a skip car for detection;
and 4, conveying the undersize products with the particle size of less than 5mm to a fine ore bin by three belt conveyors and then carrying out centralized treatment.
2. The screening method for ore detection according to claim 1, wherein: the ore bin is 10, raw materials number of products is no less than to ore bin number, will every the position of two original material mouths and electric jack on the ore bin changes into a material mouth, adds and establishes normally open fan-shaped valve, fan-shaped valve adopts manual opening and close.
3. The screening method for ore detection according to claim 1, wherein: the ore vibrating screen comprises 10 ore vibrating screens, a screen box, a vibration isolation device and a transmission device, wherein the screen frame is welded in a box type, wear-resistant lining plates are additionally arranged on the inner walls of two sides of the screen frame, the screen mesh adopts a metal carbide load comb tooth screen plate, a screen bottom frame adopts a rubber spring for vibration reduction, the screen mesh is arranged in a comb tooth shape, the feeding side is wide, the discharging side is narrow, a collecting hopper is arranged as a vibration body and is connected with the screen body through a bolt, and a layer of wear-resistant buffer net is additionally arranged at the joint; the rubber spring directly drives the eccentric shaft through flexible connection by a motor, two groups of bars with the same diameter and different lengths are arranged in parallel and crossed at equal intervals, one end of each group of bars is fixed on the cross beam, and the other end of each group of bars is in a free state to form a group of cantilever elastic screen meshes; materials on the screen are borne by the bars, the movement directions of the bars and the materials are the same, the sieve holes formed among the bars are long-strip-shaped with open tail ends, and if a critical particle is blocked, the top can easily come from the open ends of the strip-shaped sieve holes under the flushing of other materials; when the screen works, the cantilever bars vibrate for the second time besides vibrating together with the screen box, so that the amplitude is amplified, and the screening efficiency is improved; the bar vibration range is related to diameter, length, when the excited produces secondary vibration, the geometric dimension of rational selection bar, the shape size of sieve mesh constantly high frequency change, further avoid the card of critical particle to block, there is certain vertical distance between upper and lower two sets of screens, when sieving, the material is thrown many times, in the use, sieve case and sifting surface are under the effect of vibrator, produce circular, the vibration of ellipse or straight line orbit, the vibration of sifting surface makes the material layer on the sifting surface loose and leaves the sifting surface and throws, make the fine fraction can see through the bed of material whereabouts and discharge through the sieve mesh, and will block the granule oscillation play in the sieve mesh, except producing the screening effect, make the material move forward.
4. The screening method for ore detection according to claim 3, wherein: on the premise of ensuring the feeding speed, the material layer is controlled to be thinnest so as to obviously improve the screening efficiency.
5. The screening method for ore detection according to claim 1, wherein: the ore belt conveyor is one, the belt width B is 1000mm, the belt speed V is 2.0m/s, the material conveying capacity Q is 900t/h, the horizontal projection length is about 7300mm, the inclination angle is less than 13 degrees, and the ore belt conveyor is used for conveying ore larger than 5mm on a screen and sending the ore to an ore weighing hopper in front of a skip car.
6. The screening method for ore detection according to claim 1, wherein: the fine ore conveyor is used for conveying fine ore with the undersize of less than or equal to 5mm to a fine ore bin, the belt width B is 500mm, the belt speed V is 1.6m/s, and the conveying capacity Q is 200 t/h.
7. The screening method for ore detection according to claim 1, wherein: the powder bin is of a steel plate welding structure, the volume of the powder bin depends on the powder ore amount and the powder ore cleaning requirement, the powder bin is of a steel structure square bin, the theoretical volume of the powder bin is 58 cubic meters, and a lower bin opening is connected with a manual fan-shaped valve.
8. The screening method for ore detection according to claim 1, wherein: the ore detection screening method is characterized in that the ore detection screening system also comprises a gate and a flap electrohydraulic push rod, the electrohydraulic push rod takes a hydraulic cylinder as a main body, an assembly of an oil pump, a motor, an oil tank, an oil filter and a hydraulic control valve is formed, the motor, the oil pump, the hydraulic control valve and the hydraulic cylinder are arranged on the same axis or on different axes according to requirements, the oil tank and a mounting support are arranged in the middle, the piston rod can move back and forth only by switching on a control power supply of the motor, the extension and retraction of the piston rod are controlled by the forward and reverse rotation of the motor, when the electrohydraulic push rod works, when the piston rod is subjected to external force exceeding the set output force or the piston still rotates to the terminal point motor, the oil pressure in an oil path is increased to the set pressure, the overflow valve overflows to realize overload protection, the motor cannot be burnt out although rotating, the pressure self-locking mechanism is arranged, the motor stops, the piston rod can be self-locked at a certain position, and the pressure maintaining state is achieved. The electro-hydraulic push rod replaces an air cylinder and an electric push rod, the hydraulic control of the system gate saves devices such as a mechanical connection electric control master, a band-type brake and the like, the system gate is stable and reliable, the opening and closing time of the gate plate is accurate, the stroke adjustment and control are convenient, the limiting device adopts a rigid connecting rod and a proximity switch, the signal transmission degree is high, and the system is suitable for remote operation.
9. The screening method for ore detection according to claim 1, wherein: the screening method for ore detection is characterized in that a screening system for ore detection further comprises a material weighing electronic scale, the material weighing electronic scale adopts a pressure type digital sensor, three sensors are arranged on the upper portion of each weighing hopper in an arrangement mode, vertical pressure of materials is borne, conversion signals are converted into digital display, interlocking signals are generated through a microcomputer and other equipment, accurate linkage is achieved, an operation chamber used for detection is provided with a mathematical display screen for electronic weighing of the weighing hoppers, an adjusting button is arranged below the operation chamber, an operator manually adjusts a set value according to needs, and is provided with a single chip microcomputer control device and a batch printer, and automatic compensation of charging material weighing and automatic printing of charging records are achieved.
10. The screening method for ore detection according to claim 1, wherein: the screening method for ore detection comprises the steps that an ore detection screening system also comprises two ore weighing hoppers, the volume of each ore weighing hopper is 2.8 cubic meters, the weight of each ore weighing hopper is not more than 3.5t, and the capacity of each ore weighing hopper is matched with a material weighing electronic scale; the ore weighing funnel adopts a steel plate welding structure with a manganese steel plate lining, the thickness of a steel plate shell is 12mm, and the thickness of the manganese steel plate lining is 24 mm. The effective volume of the ore weighing funnel is consistent with that of the skip car, and the included angle between the intersection line of the bottom plate and the side plate of the funnel and the chute and the horizontal plane is not less than 45 degrees; the discharge opening and the chute of the funnel are matched with the size of the skip opening, and the width of the upper opening of the weighing funnel is matched with the width of the belt conveyor.
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