CN212215881U

CN212215881U - Online adjustable depth grading device

Info

Publication number: CN212215881U
Application number: CN202020681125.6U
Authority: CN
Inventors: 郭国阳; 马臻; 赵梦生
Original assignee: Cypriott Tianjin Industrial Technology Co ltd
Current assignee: Cypriott Tianjin Industrial Technology Co ltd
Priority date: 2020-04-27
Filing date: 2020-04-27
Publication date: 2020-12-25
Anticipated expiration: 2030-04-27

Abstract

The utility model provides an online adjustable depth grading device, which belongs to the field of coal equipment and comprises a feeding box, a frame and a screening component, wherein the upper end opening of the feeding box is arranged as a feeding port, the lower end of the feeding box is communicated with the frame, the lower end discharge of the frame is arranged corresponding to the upper end of a discharging box, and a cutting adjusting turning plate and a material flow switching turning plate are arranged inside the discharging box; the screening component is erected on the rack and used for carrying out dry classification on raw coal; the cutting adjusting turning plate is used for adjusting the grading granularity; the material flow switching turnover plate controls one of the coal washing outlet and the pulverized coal outlet to be opened. The invention can realize online adjustable and controlled ultrafine particle powder removal, and effectively solve the problem of blockage of powder removal sieve pores of wet and sticky materials.

Description

Online adjustable depth grading device

Technical Field

The invention belongs to the field of coal equipment, relates to an intelligent powder removing unit capable of flexibly carrying out deep fine particle classification on raw coal according to different particle sizes, and particularly relates to an online adjustable deep classification device.

Background

At present, more and more coal processing and production enterprises, design and research institutions recognize the important effects of dry-process powder removal on coal before wet separation on reducing the coal slurry amount, reducing the production cost, reducing the environmental protection pressure and improving the enterprise benefits, and the pre-selection powder removal process becomes the potential requirement of most power coal preparation plants and is adopted by more and more coal preparation plants.

The nature of the de-powdering is a dry fine or ultra-fine particle classification. The process of removing the fine powder before coal selection is to remove the fine particle materials with the quality meeting the quality requirement of the product coal or the particle size below the specific particle size which can not improve the quality or the benefit by washing according to the quality requirements of different raw coals and the quality requirement of the product coal in advance, thereby avoiding entering a washing system. According to different coal qualities of raw coal and product quality requirements, the classification granularity required by powder removal is generally between 1.5 and 10 mm.

Because of the influence of factors such as the coal forming conditions of raw coal, the geological structure of a coal bed, the mining mode and the like, the quality of the raw coal in actual production often fluctuates randomly. In addition, product quality requirements may also be adjusted periodically or aperiodically based on changes in the sales market. This requires that the particle size of the desliming fraction can be flexibly adjusted accordingly.

Currently, the removal of fines is entirely done by means of sieving equipment to achieve classification. The screening is a process of firstly layering materials composed of particles with different particle sizes on the surface of a screening machine through different forms of movement, then enabling the materials with the particle sizes smaller than the sizes of screen holes/screen gaps to enter the lower part of a screen through a screen surface, and enabling the materials with the particle sizes larger than the screen holes/screen gaps to remain on the screen surface (finally discharging through the conveying movement of the screening machine), so that the materials are classified according to the particle sizes defined by the screen holes/screen gaps.

The existing powder removing screening machines all adopt screening machines with preset screen holes/screen slits, and the powder removing granularity is completely controlled by the screen holes/screen slits. The method is limited by factors such as equipment processing precision, sieve plate strength, coal material properties and the like, and has the following problems that 1, the lower limit of the classification granularity is higher (more than 3 mm), the requirement of process application on lower limit of the classification granularity of the pulverized coal cannot be met (such as 1.5mm), the smallest screen slot of the conventional pulverized coal removal sieve for coal pulverized coal removal can only be 3mm, and the pulverized coal removal with finer granularity cannot be realized; 2. the sieve pores of the powder removing sieve are easy to block, and in actual production, when the fed material is wet and sticky, the sieve pores are often blocked, so that the powder removing efficiency is seriously reduced, and even normal production cannot be realized; 3. the online flexible adjustment of the powder removing granularity cannot be realized, the adjustment of the grading granularity of the existing powder removing sieve can only be realized by replacing sieve plates with different sieve mesh/sieve slot sizes or reassembling sieve shafts with different shaft sleeves, the online adjustment cannot be realized, the production stop time is long, and the cost is extremely high.

In summary, the existing dust removing screen used in coal industry has the following problems: the minimum screen hole which can be realized can not meet the requirement of the lower limit of the powder removing classification granularity; sieve pores are easy to block, and the powder removing effect and the production reliability are influenced; the problems that the existing powder removing sieve can not completely meet the process and production management requirements of the powder removing application in the coal industry and the popularization of the novel and efficient process of powder removing before selection is severely restricted are that the powder removing classification granularity is difficult to adjust, the cost is high and the online flexible adjustment can not be realized. The industry is in need of solving the above problems of the prior powder removing equipment.

Disclosure of Invention

The invention aims to provide an online adjustable depth grading device, which reduces the lower limit of the powder removing grading granularity to 1-1.5mm, effectively solves the problem of blockage of powder removing sieve pores of wet and sticky materials, realizes online flexible adjustment of the powder removing grading granularity, and meets the requirement of raw coal powder removing and washing in the coal industry.

In order to solve the technical problem, the utility model discloses a technical scheme is: the online adjustable depth grading device comprises a feeding box, a rack and a screening component, wherein an opening at the upper end of the feeding box is used as a feeding port, the lower end of the feeding box is communicated with the rack, a discharging port at the lower end of the rack is arranged corresponding to the upper end of the discharging box, and a dividing and adjusting turning plate and a material flow switching turning plate are arranged in the discharging box;

the screening component is erected on the rack and used for carrying out dry classification on raw coal;

the cutting adjusting turning plate is used for adjusting the grading granularity;

the material flow switching turnover plate controls one of the coal washing outlet and the pulverized coal outlet to be opened.

Further, the frame is followed the one end of pan feeding case sets up to the other end slope downwards, and screening subassembly sets up to the other end slope downwards from the one end of pan feeding case, screening subassembly is including supporting rotation axis and the rotating electrical machines who sets up, the swivel spindle erects in the frame, the rotating electrical machines drive the rotation axis syntropy rotates, be equipped with coaxial a plurality of sieves on the rotation axis, the crisscross setting of sieve on the adjacent rotation axis.

Furthermore, the discharging box is divided into a plurality of areas along the length direction of the powder removing unit through a dividing and adjusting turning plate, and the dividing and adjusting turning plate is fixed between two adjacent areas in the discharging box and used for adjusting the size of the divided areas; the lower end of each partition area of the blanking box is provided with two discharge ports, one outlet is communicated with the pulverized coal line, the other outlet is communicated with the coal washing line, and the material flows through the material flow switching turnover plate to enter one direction.

Furthermore, the cutting adjusting turning plate and the material flow switching turning plate are driven to rotate by an electric, electrohydraulic or pneumatic actuating mechanism, and the actuating mechanisms of the cutting adjusting turning plate and the material flow switching turning plate receive remote online control of the monitoring assembly.

On-line adjustable degree of depth grading plant be equipped with double-deck scraper blade along its length direction under the workbin, the upper strata and the undersize chute material of double-deck scraper blade correspond the setting, continuous operation about the double-deck scraper blade, upper scraper blade and the material backward motion of oversize, lower floor's scraper blade and the material syntropy operation of oversize, the discharge gate on double-deck scraper blade upper strata corresponds the setting with fine coal collection device, the discharge gate of double-deck scraper blade lower floor corresponds the setting with going into coal washing collection device.

Further, the lower part in two regions of pan feeding case is kept away from to the workbin the position that double-deck scraper blade upper strata corresponds is equipped with the damper gate, the damper gate is driven by power, pneumatic source or the source that surges, when the damper gate was opened, the screen underflow thing of corresponding section entered into the lower floor of double-deck scraper blade enters into the washing system thereupon, the damper gate is opened gradually from the one side of keeping away from the pan feeding case to the opposite side, or is closed gradually from leaning on pan feeding case one side case opposite side to reach the mesh of reducing or heightening hierarchical granularity.

Further, the discharge end of the pollen trap unit is equipped with secondary screen (ing), secondary screen (ing) includes second screening subassembly, second frame and play workbin, the lower extreme that goes out the workbin is equipped with a discharge gate, second screening subassembly establishes in the second frame, second screening subassembly's structure with screening subassembly's structure is the same, second screening subassembly from a side direction other end slope that is close to the pan feeding case set up downwards and the slope with screening subassembly's slope is unanimous, second screening subassembly's upper end is less than screening subassembly's the lower extreme sets up, second screening subassembly with be equipped with the downward guide plate that sets up of slope between the screening subassembly.

Compared with the prior art, the utility model has the advantages and positive effect as follows.

1. The utility model can realize the online adjustable and controllable superfine particle powder removal, the lower limit of the powder removal granularity can reach 1-1.5mm, and the problem of sieve pore/sieve seam blockage is not easy to occur, thereby effectively solving the problem of sieve pore blockage in the powder removal of wet-bonded materials and meeting the requirement of raw coal powder removal and washing in the coal industry;

2. the screen seam selection of the fine particle grading screen can be properly larger than the actual powder removal grading particle size, and the final powder removal grading particle size is further regulated and controlled by a manner of subsection cutting of undersize materials, namely, the closer the segmentation regulation turnover plate is to the feeding box, the finer the final powder removal grading particle size is, so that the lower limit of the powder removal grading particle size can be further reduced and the blockage phenomenon of the screen seam of the fine particle grading screen can be avoided/reduced;

3. the structure overcomes the problem that the powder removing granularity of the existing powder removing equipment can not be adjusted on line, the automation and the intellectualization of the process adjustment of the powder removing process link are realized, the labor cost and the waste of production materials caused by replacing the sieve plate or reloading the sieve surface during the granularity adjustment of the existing equipment can be greatly reduced, and the influence of the powder removing granularity adjustment time on the normal production is reduced.

Drawings

The accompanying drawings, which form a part hereof, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without undue limitation. In the drawings:

FIG. 1 is a schematic diagram of the screening of the present invention;

FIG. 2 is a front view of the on-line adjustable depth grading device of the present invention;

FIG. 3 is a front view of the on-line adjustable depth grading device of the present invention;

figure 4 is a detailed view of section a of figure 3 of the present invention;

figure 5 is a detail view of section B of figure 3 of the present invention;

FIG. 6 is a schematic top view of the on-line adjustable depth grading device of the present invention;

FIG. 7 is a schematic side view of the on-line adjustable depth grading apparatus of the present invention;

FIG. 8 is a structural schematic of the on-line adjustable depth grading apparatus of the present invention without the frame and the shield from a top view;

FIG. 9 is a side view of the on-line adjustable depth grading apparatus of the present invention without the frame and shield;

fig. 10 is a schematic structural view of embodiment 2 of the present invention;

FIG. 11 is a schematic flow chart of the practical application process of the on-line adjustable depth grading device of the present invention;

FIG. 12 is a schematic structural diagram of the online adjustable depth grading device in a top view during practical application;

FIG. 13 is a schematic structural view of the back view of the on-line adjustable depth grading device of the present invention in practical application;

fig. 14 is a front sectional view of the scraper conveyor No. 1 of the present invention;

figure 15 is a detail view of section C of figure 14 of the present invention;

fig. 16 is a detailed view of the portion D of fig. 14 according to the present invention.

Reference numerals:

10. a powder removing machine set; 11. feeding into a box; 12. a frame; 13. a screen assembly; 131. a rotating shaft; 132. a sieve plate; 133. A rotating electric machine; 14. a blanking box; 141. a first driving member; 142. a second driving member; 143. dividing and adjusting the turning plate; 144. a material flow switching turnover plate; 145. entering a coal washing outlet; 146. a pulverized coal outlet; 15. a secondary screening machine; 151. a second frame; 152. a second screen assembly; 153. a discharging box; 154. a discharge plate; 16. a baffle; 17. a double-layer scraper; 18. Adjusting a gate; 19. a chute; 20. a coal washing line; 21. no. 1 scraper machine; 22. washing a raw coal belt; 23. a washing and selecting system; 24. washing a clean coal belt; 25. a waste belt; 30. a pulverized coal line; 31. no. 2 scraper machine; 32. a pulverized coal belt; 33. A product belt; 40. a monitoring component; 41. a belt scale; 42. an ash content meter.

Detailed Description

It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings.

Fig. 1 shows a sieving mechanism of a material during sieving, which is proved to be correct through a large number of experiments and observation results, wherein particles (called as 'half particles' in the technical term) with a particle size smaller than one half of a sieve pore size are easy-to-sieve particles, the particles can quickly pass through the sieve at a position close to a feeding end of a sieving machine, and the particles with a particle size smaller than the sieve pore/sieve gap size are easy to pass through the sieve, so that the particle size composition of undersize materials along the length direction of the sieving machine from the feeding end to a discharging end is in the following rule: the material below half granule concentrates on the position that is close to the sieve machine pan feeding end, then is close to the discharge end more, and the material content of the bigger particle diameter is higher, the material content of the less particle diameter is lower in the undersize thing granularity composition.

As shown in fig. 12-14, the present invention is an online adjustable depth grading device, which includes a fines removal unit 10, a coal washing line 20, a pulverized coal line 30 and a monitoring assembly 40, wherein the upper end of the fines removal unit 10 is provided with a feeding box 11, the lower end of the fines removal unit 10 is provided with a pulverized coal outlet 146 and a coal feeding outlet 145, the pulverized coal outlet 146 is arranged corresponding to the feeding end of the pulverized coal line 30, the coal feeding outlet 145 is arranged corresponding to the feeding end of the coal washing line 20, the monitoring assembly 40 receives a signal from an electric control element and controls the start and stop of the electric control element, the discharging end of the coal washing line 20 is arranged corresponding to the coal washing system 23, more preferably, the lower end of the pulverized coal outlet 146 is provided with a chute 19, the outlet of the coal entering into the washing machine is provided with independent chutes 19, the upper end of each chute 19 corresponds to a unique inlet, and the lower end of each chute 19 corresponds to a unique outlet, so that the transfer of materials from the powder removing unit 10 to the coal washing line 20 or the pulverized coal line 30 is realized.

Preferably, coal washing line 20 includes that No. 1 that the assembly line set gradually scrapes trigger 21 and goes into washing raw coal belt 22, and No. 1 scrapes trigger 21 and establishes the lower extreme at income coal washing export 145, and No. 1 scrapes trigger 21's discharge end and goes into washing raw coal belt 22 and correspond the setting, goes into washing raw coal belt 22's discharge end and washing system 23 and corresponds the setting, and washing system 23's output is equipped with washing clean coal belt 24 and waste rock belt 25.

Preferably, the fine coal line 30 includes 2 scraping board machine 31, fine coal belt 32 that the assembly line set gradually, and 2 scraping board machine 31 corresponds the setting with fine coal export 146, and 2 scraping board machine 31's discharge end corresponds the setting with fine coal belt 32, and fine coal belt 32 and clean coal belt 24's export all gets into product belt 33, mixes the back as the product coal.

As shown in fig. 14-16, 1 scrape trigger 21 and 2 and scrape trigger 31's structure the same, and 1 number scrapes the upper end opening setting of trigger 21, conveniently receives the material of whereabouts, and the discharge end lower part of lower extreme is equipped with discharge gate 212, and 1 number scrapes trigger 21 and is the box structure, and inside is equipped with the conveyer belt structure, and the upper end equipartition of conveyer belt has a plurality of stirring boards 211, conveniently takes animal workbin discharge gate 212 to transport in the process of transporting.

Preferably, the monitoring assembly 40 includes three belt weighers 41, one belt weigher 41 is used for measuring the weight of the raw coal fed, one belt weigher 41 is used for measuring the weight of the pulverized coal, one belt weigher 41 is used for measuring the weight of the product coal, the monitoring assembly 40 further includes two ash meters 42, one ash meter 42 is arranged corresponding to the product coal on the product belt 33, and one ash meter is arranged corresponding to the gangue belt 25 of the coal washing line 20, the monitoring assembly 40 receives and transmits the detection data of the three belt weighers 41 and the two ash meters 42, collects the number quality information of the raw coal, the pulverized coal and the final product, facilitates real-time monitoring and adjustment, and forms a closed-loop control and self-feedback system.

Ash content appearance 42 for the real-time supervision of ash content, the ash content is the important parameter of weighing of product quality, control subassembly 40 receives ash content appearance 42 real-time supervision's data, then compare the data of gathering with preset data, contrast and algorithm are the means commonly used in the field, do not carry out the cumulus here, adjust the action of meal removal unit 10 through control center, the detailed statement is as follows, this has realized closed-loop control, be fit for the quick analysis and the online adjustment of coal quality, in this application, ash content appearance 42 also can be replaced with calorimeter, the function of this application can all be realized to the detector that can detect product quality, calorimeter measurable quantity of heat, ash content and calorific capacity all can be used for weighing product quality.

The monitoring component 40 and the control center in the structure are communicated with a production system of the coal preparation plant, analyze and arrange the quality information of raw coal and products, perform PID control on the powder removal amount and the final quality (ash content) and the like, and can be used as subsystems to be incorporated into an integral centralized control system of the coal preparation plant.

As shown in fig. 2-10, the powder removing machine set 10 includes a feeding box 11, a frame 2, a sieving assembly 13 and a discharging box 14, wherein the upper end of the feeding box 11 is opened to be used as a feeding port, the lower end of the feeding box is communicated with the frame 2, the upper end of the frame 2 is closed, the discharging at the lower end of the feeding box is arranged corresponding to the upper end of the discharging box 14, and the lower end of the discharging box 14 is provided with a grading assembly;

the screening component 13 is erected on the frame 12, and is used for screening raw coal, the raw coal with the particle size meeting the requirement can fall into a lower feed box 14, on the basis of automatic screening, the deep classification and screening of the raw coal are facilitated through the intervention of the screening component 13, and the efficiency of the deep classification screening is improved;

frame 2 sets up downwards from the one end of pan feeding case 11 to the other end slope, and screening subassembly 13 sets up downwards from the one end of pan feeding case 11 to the other end slope, and frame 2 and screening subassembly 13 match and set up all slope downwards, guarantee that the raw coal constantly conveys downwards under the effect of gravity, save the power conveying, make simple and compact more of structure moreover.

Preferably, the inside of pan feeding case 11 is equipped with guide plate 111 that the downward sloping set up, the in-process of pan feeding is dropped from the upper end to the raw coal, there is the effect of a buffering and direction, the noise reduction, also avoid the raw coal directly to drop to arouse on sieve subassembly 13 and strike or dust, avoid the granule to fly upward and leak, environmental protection more, the upper end of frame 2 is equipped with door type structure's maintenance door 121, the condition that the screening is not smooth and easy appears, can be timely open and look over, be favorable to timely maintenance and maintenance, promote the convenience of maintaining, the quantity of maintenance door 121 is a plurality of, and the equipartition sets up, the upper end of maintenance door 121 is equipped with the handle of convenient operation, promote the convenience of operation, the upper end of frame 2 is equipped with a plurality of hoistholes, the convenience is hoisted in the equipment, promote the convenience of.

Preferably, screening subassembly 13 includes rotation axis 131 and rotating electrical machines 133 that the supporting set up, rotation axis 131 erects in frame 2, the both ends of rotation axis 131 are passed through bearing and the relative frame 2 rotation of bearing frame structure, rotating electrical machines 133 is established in frame 2 through the motor cabinet, rotating electrical machines 133 drive rotation axis 131 rotates, be equipped with coaxial a plurality of sieve 132 on the rotation axis 131, a plurality of sieve 132 parallel arrangement, sieve 132 on the adjacent rotation axis 131 are crisscross to be set up, rotation axis 131 is at the pivoted in-process, drive sieve 132 and rotate, the pan feeding coal enters into between sieve 132 or between sieve 132 and rotation axis 131, the fine coal falls from the gap between sieve and the sieve.

Preferably, the upper portion of the discharging box 14 is hinged with two dividing and adjusting turning plates 143, the dividing and adjusting turning plates 143 are rotated by a first driving member 141, the discharging box 14 is sequentially divided into three regions from one side to the other side of the feeding box 11 by the two dividing and adjusting turning plates, the lower end of each region is provided with two discharging ports, one is a pulverized coal outlet 146 and the other is a coal washing outlet 145, the pulverized coal outlet 146 and the coal washing outlet 145 realize that only one is in an open state through the position change of the material flow switching turning plate 144, the dividing and adjusting turning plates are rotated under the action of the first driving member 141, the dividing and adjusting turning plates are fixed with the output shaft of the first driving member 141, the rotating angle of the dividing and adjusting turning plates is adjusted according to the discharging condition, namely the particle size of each region, if the particles are larger in the region close to the feeding box 11, the first driving member 141 drives the dividing and adjusting turning plates to rotate, the particle size of the area closest to the feeding box 11 is ensured to be minimum to meet the set requirement, otherwise, if the particle size of the area closest to the feeding box 11 is small enough and the particle size of the adjacent second area is small, the cutting and adjusting turning plate rotates at one side of the box away from the feeding box 11 under the action of the first driving piece 141 to enlarge the corresponding area, the first driving piece 141 can be adjusted at any time through the control center, online real-time adjustment is realized, the automation degree is high, the manpower is saved, the control center adopts a PLC (programmable logic controller) control center, which is a universal control form in the market, the programming is simple and easy to learn, the training cost of operators is reduced, besides the PLC control program, the singlechip structure can also be adopted, the running states of all electrical components are monitored through the PLC/singlechip and related control components in the cabinet according to externally input process parameters, Controlling the subsection cutting position of undersize materials and the heading of each undersize material, and the like.

Preferably, the material flow switching flap 144 is hinged in the blanking box 14, the material flow switching flap 144 is driven to rotate by a second drive arranged on the blanking box 14, two extreme positions of the material flow switching flap 144, one corresponding to the pulverized coal outlet 146, one corresponding to the coal washing outlet 145, and only one of them may be opened, the open position may be different for different areas of the headbox 14, in the region that is close to pan feeding case 11, the raw coal granularity is thin, and the material flow switches turns over board 144 lid and establishes at income coal washing export 145, and the fine coal that sieves out directly discharges through fine coal export 146, directly enters into next process, and first driving piece 141 and second driving piece 142 all can adopt motor, revolving cylinder or the spacing automatic picture peg gate structure of pneumatics, do not do in this application and prescribe a limit to, and the equivalent structure that many realizations, revolving cylinder, motor lead screw isotructure all can realize.

Preferably, a secondary screening machine 15 is arranged at one end, away from the feeding box 11, of the frame 2, the secondary screening machine 15 comprises a second screening assembly 152, a second frame 151 and a discharging box 153, the second frame 151 is arranged at the upper end of the discharging box 153 and is communicated with the upper end of the discharging box 153, a discharging port is arranged at the lower end of the discharging box 153, the second screening assembly 152 is arranged on the second frame 151, the structure of the second screening assembly 152 is the same as that of the screening assembly 13, and a discharging plate 154 which is obliquely arranged downwards is arranged at one end, away from the frame 2, of the second frame 151, so that the efficiency of coal washing is improved; more preferably, second screen assembly 152 sets up and the slope is unanimous with the slope of screen assembly 13 from a side to the other end slope that is close to pan feeding box 11 downwards, and the upper end of second screen assembly 152 is less than the lower extreme setting of screen assembly 13, is equipped with the guide plate 16 that the slope set up downwards between second screen assembly 152 and the screen assembly 13 for when the cascaded conveying of raw coal, guarantee the stability of conveying, and the setting of drop height type has certain vibrations effect, play the effect of the separation blanking of front and back section.

In the structure, the screening component 13 adopts a screen sheet roller screen structure, and can also select a tension screen suitable for fine particle classification, and the selection is carried out according to the actual situation, so that the screening result can be realized, the length and the width of the frame 2 and the blanking box 14 are matched, the number of the area sections of the blanking box 14 can be adjusted according to the actual situation, can be set to be multiple, and can be set and adjusted according to the actual requirement.

In the actual working process, the structure is locked with other production system equipment of a coal preparation plant, the automatic start is carried out according to the reverse coal flow sequence, firstly, the input and the comparison of parameters are carried out, a washing control system sends product quality, mainly referring to ash content parameters, control interval setting indexes and preset separation density to an online adjustable depth grading device, the parameters of different product settings are different and are adjusted according to the actual situation, the online adjustable depth grading device simulates and calculates the powder removal proportion and the powder removal granularity by utilizing a pre-established powder removal model curve according to reference coal quality data stored in the system in advance, then the signals are sent to a powder removal unit for execution, the powder removal unit acts in place according to signals sent by a control center of the online adjustable depth grading device to serve as the initial working state of the powder removal system, and the step is completed in the automatic start process, the washing control system is a system which is always used in the field, and the existing structure on the market can be matched with the application.

The monitoring component 20 moves, data collected by the belt weigher and the ash content meter are fed back to a control center of the online adjustable depth grading device, the online adjustable depth grading device automatically calculates the quantity of raw coal to be washed, the quantity and the quality of clean coal to be washed according to the feedback data, and the data can be used as the basis for adjusting the partition adjusting turning plate of the online adjustable depth grading device.

The online adjustable depth grading device compares the feedback data (actual final product ash content) of the ash content instrument with the preset final product ash content range in real time, if the actual final product ash content is in the preset range, the segmentation adjustment turning plate of the ash removal system does not act, if the actual final product ash content is higher than the preset final product ash content interval upper limit, the segmentation adjustment turning plate moves towards one end of the feeding box, the ash removal granularity is reduced, the washing proportion is improved, if the actual final product ash content is lower than the preset final product ash content interval lower limit, the segmentation adjustment turning plate moves towards one end far away from the feeding box, the powder removal granularity is improved, the washing proportion is reduced, the online adjustable depth grading device monitors the data of the ash content instrument in real time through the monitoring component, the material cutting position under the sieve is adjusted, the powder removal amount is controlled, and the final product ash content is ensured to be in the set interval all.

When the coal preparation plant is stopped, the intelligent powder removal process system equipment is locked with other production system equipment of the coal preparation plant, and the intelligent powder removal process system equipment is automatically stopped according to the coal flow sequence.

The working process of the powder removing unit is as follows, raw coal is fed into the feeding box 11 through a feeding belt, under the action of gravity, the raw coal is conveyed from one end of the feeding box 11 to the other end, at the moment, according to the principle shown in figure 1, the fine coal with the required granularity smaller than 1.5mm falls into the area of the discharging box 14 closest to the feeding box 11, then the material flow switching turnover plate 144 covers the coal inlet washing outlet 145, the fine coal with the granularity requirement is output from the fine coal outlet 146, the raw coal without the granularity requirement is continuously conveyed downwards on the screening component 13, in the conveying process, the position of the material flow switching turnover plate 144 is adjusted according to the granularity size, the output of the fine coal is realized, the raw coal is continuously screened along with the continuous conveying of the raw coal, the raw coal is continuously deeply graded and output, and finally enters the secondary screening machine 15, the coal inlet washing efficiency is improved, and the whole structure is improved, the material flow switching turning plate 144 and the position of the partition adjusting turning plate can be adjusted through the control center, online intelligent adjustment and classification are achieved, the automation degree is high, the labor intensity is reduced, and the working efficiency is improved.

Example 2: as shown in fig. 11, different from the above embodiment, the lower box 14 is sequentially divided into three regions from one side to the other side of the feeding box 11, a double-layer scraper 17 is arranged below the lower box 14 along the length direction thereof, the upper layer of the double-layer scraper 17 is arranged corresponding to the undersize chute material, the double-layer scraper 17 continuously runs up and down, the upper layer scraper runs in the reverse direction to the oversize material, the lower layer scraper runs in the same direction to the oversize material, the discharge port on the upper layer of the double-layer scraper 17 is arranged corresponding to the pulverized coal collecting device, and the discharge port on the lower layer of the double-layer scraper 17 is arranged corresponding to the coal washing collecting.

Preferably, the lower bin 14 is far away from the lower part of the two regions of the feeding bin 11, an adjusting gate 18 is arranged at a position corresponding to the upper layer of the double-layer scraper 17, the adjusting gate 18 is driven by an electric power source, a pneumatic power source or a hydraulic power source, when the adjusting gate 18 is opened, undersize of corresponding sections enter the lower layer of the double-layer scraper 17 and then enter the washing system, the adjusting gate 18 is gradually opened from one side far away from the feeding bin 11 to the other side, the undersize particle size is set according to regulation, the opening degree of each adjusting gate 18 can be controlled randomly according to requirements, online automatic adjustment is achieved, and the automatic adjustment is convenient, reliable and intelligent.

The specific working process of the embodiment 2 is different from the above embodiment in that the separation and adjustment of the turning plate is not performed on the screening of the particle size, the adjustment gate 18 on the double-layer scraper 17 is used for controlling, the adjustment gate 18 has the function equivalent to the separation and adjustment of the turning plate, the double-layer scraper 17 has the function equivalent to the powder outlet and the coal washing outlet 145, the blanking screening of the two embodiments is different, but the function of deep classification can be realized, and the on-line adjustment can be realized.

While one embodiment of the present invention has been described in detail, the description is only a preferred embodiment of the present invention, and should not be considered as limiting the scope of the present invention. All the equivalent changes and improvements made according to the application scope of the present invention should still fall within the patent coverage of the present invention.

Claims

1. On-line adjustable depth grading device, its characterized in that: the material feeding device comprises a material feeding box, a rack and a screening component, wherein an opening at the upper end of the material feeding box is used as a material feeding port, the lower end of the material feeding box is communicated with the rack, a material discharging at the lower end of the rack is arranged corresponding to the upper end of a material discharging box, and a dividing and adjusting turning plate and a material flow switching turning plate are arranged in the material discharging box;

2. The on-line adjustable depth rating device of claim 1, wherein: the frame is followed the one end of pan feeding case sets up to the other end slope downwards, and screening subassembly sets up to the other end slope downwards from the one end of pan feeding case, screening subassembly is including supporting rotation axis and the rotating electrical machines that sets up, the rotating shaft erects in the frame, the rotating electrical machines drive the rotation axis syntropy rotates, be equipped with coaxial a plurality of sieves on the rotation axis, adjacent rotatory epaxial sieve is crisscross to be set up.

3. The on-line adjustable depth rating device of claim 1, wherein: the discharging box is divided into a plurality of areas along the length direction of the powder removing unit through a dividing and adjusting turning plate, and the dividing and adjusting turning plate is arranged between two adjacent areas in the discharging box and used for adjusting the size of the divided areas; the lower end of each partition area of the blanking box is provided with two discharge ports, one outlet is communicated with the pulverized coal line, the other outlet is communicated with the coal washing line, and the material flows through the material flow switching turnover plate to enter one direction.

4. The on-line adjustable depth rating device of claim 1, wherein: the cutting adjusting turning plate and the material flow switching turning plate are driven to rotate by an electric, electrohydraulic or pneumatic actuating mechanism, and the actuating mechanisms of the cutting adjusting turning plate and the material flow switching turning plate receive remote online control of the monitoring assembly.

5. The on-line adjustable depth rating device of claim 1, wherein: the lower material discharging box is provided with a double-layer scraper plate along the length direction, the upper layer of the double-layer scraper plate corresponds to the undersize chute material, the double-layer scraper plate continuously operates up and down, the discharge port at the upper end of the double-layer scraper plate corresponds to the pulverized coal collecting device, and the discharge port at the lower end of the double-layer scraper plate corresponds to the coal washing collecting device.

6. The on-line adjustable depth rating device of claim 5, wherein: the feed box is kept away from the below in two regions of pan feeding case the position that double-deck scraper blade corresponds is equipped with the adjusting gate, the adjusting gate is driven by electric power, pneumatic source or the source that surges, when the adjusting gate was opened, the screen underflow thing of corresponding section entered into the lower floor of double-deck scraper blade enters into the washing system thereupon, the adjusting gate is progressively opened from the one side of keeping away from the pan feeding case to the opposite side, or is progressively closed from leaning on a pan feeding case one side case opposite side to reach the mesh of reducing or heightening hierarchical granularity.

7. The on-line adjustable depth rating device of claim 3, wherein: the discharge end of the powder removal unit is provided with a secondary screening machine, the secondary screening machine comprises a second screening component, a second rack and a discharge box, the lower end of the discharge box is provided with a discharge port, the second screening component is arranged on the second rack, the structure of the second screening component is the same as that of the screening component, the second screening component is downwards arranged from one side close to the feed box to the other end in a slope manner, the slope of the second screening component is consistent with that of the screening component, the upper end of the second screening component is lower than that of the screening component, and the second screening component is provided with a guide plate which is arranged between the screening components in a slope manner.