CN212309149U - Closed gravity particle multistage separation dust remover - Google Patents

Abstract

The utility model provides a closed gravity granule multistage separation dust remover, including main part and screening unit, be provided with dust removal wind entry and dust removal wind export in the main part, can realize the dust removal purification to the material like this. And simultaneously, the utility model discloses set up the screening unit in the main part, the screening unit is provided with a plurality ofly, and each screening unit can both carry out the screening separation to the material of different granularities to realize the hierarchical classification of material, can also carry out the screening purification of material once more simultaneously. The screening unit is also provided with an independent discharge pipe, and the classified materials can be independently output. The utility model has the advantages of simple structure, compact and reasonable design, can adopt one set of equipment to realize the dust removal and the classification of material simultaneously, and its use is very convenient. The utility model discloses an use and solved among the prior art to many sets of equipment combined operation that needs granule class material processing occupy the operating space big, the big scheduling problem of plant maintenance operation volume that exists completely.

Description

Closed gravity particle multistage separation dust remover

Technical Field

The utility model relates to a granule class material processing technology field, more specifically say, in particular to closed gravity granule multistage separation dust remover.

Background

In the prior art, the processing of the particulate materials generally includes dust removal and classification, and for the dust removal operation, the dust removal operation is realized by a gravity dust remover, that is, by utilizing the difference of the specific weight of the particulate materials and the dust, in the flowing air flow, the lighter dust can flow with the wind, and the heavier particulate materials directly fall down, so as to realize the dust removal. For classification operations, it is common to use a vibrating screen in conjunction with a particle classification apparatus, where the vibrating screen screens particles by converting mechanical energy into kinetic energy of the particles and moving the particles over a screen. The particle grade classification device performs particle grade separation when particles pass through different screen panels.

At present, the purpose of dust removal and particle classification is realized by the combined transportation of three sets of equipment, namely a gravity dust collector, a vibrating screen and particle classification equipment, and the combined transportation of the three sets of equipment causes high equipment construction cost, large purchase quantity, large electric energy use quantity, large occupied operation space of the equipment, large operation quantity and operation quantity of the equipment, and large equipment combined quantity.

SUMMERY OF THE UTILITY MODEL

In conclusion, how to solve the problems of large occupied operation space, large equipment maintenance operation amount and the like caused by the fact that a plurality of sets of equipment are required for processing the granular materials in the prior art, the method becomes a problem to be solved by technical personnel in the field.

In order to achieve the above object, the present invention provides the following technical solutions:

the utility model provides a closed gravity granule multistage separation dust remover, this closed gravity granule multistage separation dust remover includes:

the device comprises a main body, a processing channel is arranged in the main body, a feeding port communicated with the processing channel is formed in the top of the main body, a discharging port communicated with the processing channel is formed in the bottom of the main body, a dedusting air inlet is formed in the lower part of the main body, a dedusting air outlet is formed in the upper part of the main body, and a counter-flow air channel is formed in the processing channel from the dedusting air inlet to the dedusting air outlet;

the screening unit, the screening unit set up in the processing passageway, the upper portion of screening unit is provided with the screen cloth, the sub-unit connection of screening unit has the discharging pipe, the end of discharging pipe set up in outside the main part, the warp the material that the screening unit was sieved by the discharging pipe is discharged, and all the other materials by the discharge gate is discharged.

Preferably, in the closed gravity particle multistage separation dust remover provided by the utility model, the screen is a conical screen; there is a space between the sieving unit and the side wall of the main body enclosing the processing channel in the radial direction of the main body.

Preferably, in the closed gravity particle multistage separation dust remover provided by the utility model, the screening unit is located in the countercurrent air duct, around the screening unit the screen cloth is provided with one and is used for with the material water conservancy diversion extremely guide plate on the screen cloth.

Preferably, in the closed gravity particle multistage separation dust remover provided by the utility model, the lower part of screening unit is provided with the funnel that gathers materials, the discharging pipe with the osculum end of the funnel that gathers materials is connected, the screen cloth set up in the macrostoma of the funnel that gathers materials is served.

Preferably, in the closed gravity particle multistage separation dust remover provided by the utility model, the screening unit be provided with a plurality ofly and in follow in the processing passageway the extending direction of processing passageway arranges the setting in proper order, and is whole in the direction from top to bottom in the screening unit the screening grade of screen cloth with the bottom outer fringe of screen cloth increases gradually.

Preferably, in the closed gravity particle multistage separation dust remover provided by the utility model, a bulk material cone (17) for carrying out bulk material and wear prevention is arranged on the screening unit close to the feeding port.

Preferably, in the closed gravity particle multistage separation dust remover provided by the utility model, in be provided with the blanking pipe in the main part, the blanking pipe set up in the treatment channel, the one end orientation of blanking pipe the pan feeding mouth sets up, and the other end sets up with being close to the screen cloth of the screening unit of pan feeding mouth relatively.

Preferably, in the closed gravity particle multistage separation dust remover provided by the utility model, one end of the blanking pipe facing the screen is of a reducing closing structure and is sleeved with a gathering cover outside the blanking pipe; the gathering cover is arranged in an extending mode relative to the end face of the blanking pipe in the direction of the screen and used for gathering the rebounding materials.

Preferably, in the closed gravity particle multistage separation dust remover provided by the utility model, be provided with annular pressure-equalizing box on the dust removal wind export, with the pressure-equalizing box is connected with the convulsions tuber pipe.

Preferably, in the closed gravity particle multistage separation dust remover provided by the utility model, an inlet bellows is arranged on the dust removing air inlet, and the inlet bellows is connected with an inlet air pipe.

Compared with the prior art, the method has the following beneficial effects:

the utility model provides a closed gravity granule multistage separation dust remover the utility model discloses in, this closed gravity granule multistage separation dust remover is provided with dust removal wind entry and dust removal wind export including main part and screening unit in the main part, can realize the dust removal purification to the material like this. And simultaneously, the utility model discloses set up the screening unit in the main part, the screening unit is provided with a plurality ofly, and each screening unit can both carry out the screening separation to the material of different granularities to realize the hierarchical classification of material, can also carry out the screening purification of material once more simultaneously. The screening unit is also provided with an independent discharge pipe, and the classified materials can be independently output. The utility model has the advantages of simple structure, compact and reasonable design, can adopt one set of equipment to realize the dust removal and the classification of material simultaneously, and its use is very convenient. Through the structure design, the utility model discloses an it needs the many sets of equipment combined operation to take the operating space big, the big scheduling problem of plant maintenance operation volume that exists to granule class material processing among the prior art to have solved completely to use.

Drawings

The accompanying drawings, which form a part of the present application, 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 and not to limit the invention. Wherein:

fig. 1 is a schematic structural diagram of a closed gravity particle multistage separation dust remover according to an embodiment of the present invention.

In fig. 1, the correspondence between the component names and the reference numerals is:

the device comprises a main body 1, a treatment channel 2, a feeding port 3, a discharging port 4, a dedusting air inlet 5, a dedusting air outlet 6, a screen 7, a discharging pipe 8, an aggregate funnel 9, a guide plate 10, a guide plate gathering section 10a, a guide plate anti-rebound section 10b, a blanking pipe 11, a pressure equalizing box 12, an air draft air pipe 13, an inlet air box 14, an inlet air pipe 15, an inspection window 16, a bulk cone 17 and a gathering cover 18.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments. Each example is provided by way of explanation of the invention and not limitation of the invention. In fact, it will be apparent to those skilled in the art that modifications and variations can be made in the present invention without departing from the scope or spirit of the invention. For instance, features illustrated or described as part of one embodiment, can be used with another embodiment to yield a still further embodiment. It is therefore intended that the present invention encompass such modifications and variations as fall within the scope of the appended claims and equivalents thereof.

In the description of the present invention, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description of the present invention and do not require that the present invention must be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. The terms "connected" and "connected" used in the present invention should be understood in a broad sense, and may be, for example, either fixed or detachable; they may be directly connected or indirectly connected through intermediate members, and specific meanings of the above terms will be understood by those skilled in the art as appropriate.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a closed gravity particle multistage separation dust remover according to an embodiment of the present invention.

The utility model provides a closed gravity granule multistage separation dust remover for realize the dust removal and the classification of granule class material simultaneously.

The method comprises the following steps:

first part, body 1

The main body 1 can be made into a shell-shaped structure by adopting a metal material, so that a relatively closed working space can be provided for dust removal and classification of materials.

In the using state, the main body 1 is vertically placed, the top of the main body is provided with a feeding port 3 for feeding materials, the bottom of the main body is provided with a discharging port 4, and the discharging port 4 is used for dedusting, purifying and outputting the residual materials after classification.

Set up a treatment channel 2 in main part 1 inside, like this, the material is gone into from pan feeding mouth 3 and is followed treatment channel 2 whereabouts and export from discharge gate 4 and discharging pipe 8, at the in-process of material through treatment channel 2, realizes dust removal and grading.

The utility model discloses a mode of blowing to the material realizes the separation of material and dust impurity (dust), consequently, the utility model discloses dust removal wind entry 5 and dust removal wind export 6 have been seted up in main part 1.

As can be seen from the above, the top of the main body 1 is provided with the feeding port 3, the bottom is provided with the discharging port 4, and the materials fall in the processing channel 2 from top to bottom under the action of gravity. In order to improve dust collection efficiency and dust removal effect, the utility model discloses a mode of reverse blowing is blown the material, therefore the utility model discloses in, set up dust removal wind entry 5 in the lower part of main part 1, set up dust removal wind export 6 on the upper portion of main part 1, in the direction of 5 directional dust removal wind exports 6 of dust removal wind entry to a wind channel against the current has been formed in processing passageway 2.

The air flow for dust removal enters from a dust removal air inlet 5 (arranged at the end opposite to the material inlet 3), rises to a dust removal air outlet 6 along the processing channel 2 and is discharged, and the separation of the material and dust impurities is realized in the process of convection of the material and the dust removal air flow. After separation, the material continues to fall down for classification, and the dust is output out of the main body 1 along with the airflow.

The utility model discloses set up dust removal wind entry 5 and dust removal wind export 6 in main part 1, when using, should have the supporting fan that uses. For the convenience of the access of fan, the utility model provides a following configuration optimization: a plurality of dust removing air inlets 5 are arranged, all the dust removing air inlets 5 are arranged on the main body 1 at equal intervals around the axis of the processing channel 2, an inlet air box 14 is arranged on the dust removing air inlets 5, an inlet air pipe 15 is connected with the inlet air box 14, and air flow is buffered by the inlet air box 14, so that purified air flow can be uniformly blown into the main body 1, and the dust removing effect of materials is ensured; the dedusting air outlet 6 is provided with an annular pressure equalizing box 12, the pressure equalizing box 12 is connected with an exhaust air pipe 13, and the pressure equalizing box 12 uniformly exhausts air flow from the dedusting air outlet 6, so that the flow speed of the dedusting air flow in the processing channel 2 can be ensured, and the dedusting effect can be ensured.

An inlet air box 14 is arranged on the dedusting air inlet 5 by adopting a flange structure, and an inlet air pipe 15 is arranged on the inlet air box 14 by adopting a flange structure. Of course, the inlet air box 14 can be omitted in the present invention, and the inlet air pipe 15 can be directly installed on the dust removing air inlet 5. Specifically, the blower is mounted by an inlet air duct 15.

The pressure equalizing box 12 is of an annular box structure, the pressure equalizing box 12 is installed on the dust removing air outlet 6, and air flow mixed with dust impurities can be uniformly drawn out of the main body 1 through the pressure equalizing box 12. An exhaust air pipe 13 is arranged on the pressure equalizing box 12 by adopting a flange structure, and a fan or a butt joint dust remover can be arranged on the exhaust air pipe 13. It should be noted that: the pressure equalizing box 12 is of an annular box structure, and an opening structure is arranged on the pressure equalizing box 12 and used for enabling air flow mixed with dust impurities to enter the pressure equalizing box 12.

In order to guarantee the dust removal effect to and realize multistage branch material, the setting height of casing can be than higher, so for the convenience of the production manufacturing and the transportation of casing and the inside installation that sets up of casing, the utility model discloses well casing has adopted split type structural design. The main body 1 comprises a plurality of main body units, all the main body units are arranged in sequence along a straight line, and two adjacent main body units are connected through flanges. The utility model discloses when the in-service use, during the blowback of air current from bottom to top, need provide the reverse space of air current and blanking, entry and export promptly, interlude blanking sectional area keep unanimous, in order to satisfy above-mentioned operation requirement, main unit has adopted the structural design of "two little, middle big", and this structure designs according to the subassembly structure that sets up in the main unit, and like this, main unit inner space can carry out the adaptability according to its inside subassembly that sets up and change to sufficient reverse space is provided.

According to the above, the utility model discloses set up pan feeding mouth 3 at the casing top, the material enters into the casing from the pan feeding mouth 3 at casing top, in order to lead to and gather together the input of material, the utility model discloses set up blanking pipe 11 in main part 1, blanking pipe 11 is in processing channel 2, its one end sets up towards pan feeding mouth 3, its other end sets up with the screen cloth 7 of the screening unit that is close to pan feeding mouth 3 relatively, has set up the screening unit in main part 1, realizes hierarchical the screening of material by the screening unit, and the screen cloth 7 of the screening unit that blanking pipe 11 one end is close to pan feeding mouth 3 sets up relatively, can directly with the material leading-in screen cloth 7 on, carries out the first screening of material hierarchical.

The screen 7 is arranged on the screening unit, and when dust removing air flow passes through the space between the guide plate and the screen, particulate matters also flow through the space between the guide plate and the screen 7, so that a better dust removing effect is achieved by reverse flow.

In the preferred embodiment of the present invention, the down pipe 11 is disposed inside the main body 1, one end of which is connected to the main body 1 and the other end of which is disposed toward the screen of the first upper screening unit. In order to gather together the confluence to the material, the utility model discloses with blanking pipe 11 towards the one end design of screen cloth for the formula of reducing binding off structure, can make the material confluence to bulk material awl 17 reposition of redundant personnel as far as possible through this structure. Meanwhile, in order to avoid that the falling space of the material is reduced and the falling speed of the material is influenced because the falling pipe 11 is too close to the bulk cone 17, a certain distance is formed between the mouth of the falling pipe 11 and the bulk cone 17, and the material can be rebounded due to the impact of the material on the bulk cone 17 or the screen. In order to gather together the material of bounce-back, the utility model discloses the cover is equipped with one and gathers together cover 18 on blanking pipe 11 to, gather together cover 18 and extend the setting to the direction of screen cloth for the terminal surface of blanking section for gather together the material of bounce-back. Due to the gathering cover 18, the rebounded materials can be gathered and gathered again to be screened through the screen.

Second part, screening unit

The screening unit is arranged in the processing channel 2 and can screen materials within a certain particle size range.

Specifically, the screening unit is similar to a cage structure, the upper part of the screening unit is provided with the screen 7, and the screen 7 adopts a cone structure or a circular truncated cone structure design, so that materials can smoothly flow through the screen 7 and can be screened when passing through the screen 7. The lower part of screening unit is provided with the funnel 9 that gathers materials, and the funnel 9 that gathers materials adopts the infundibulate structure, and screen cloth 7 sets up on the macrostoma end of the funnel 9 that gathers materials, and the osculum end of the funnel 9 that gathers materials is connected with discharging pipe 8, and discharging pipe 8 sets up in the lower part of screening unit, and discharging pipe 8's end sets up outside main part 1, and the material of being separated by screen cloth 7 can be collected by the funnel 9 that gathers materials, then exports through discharging pipe.

When the material removes dust and sieves the time, great granule material freely falls and is directly exported by discharge gate 4 behind a plurality of screening units, can directly connect material equipment in discharge gate 4 department, and the material of screening through the screening unit is shunted by discharging pipe 8, and the export output of discharging pipe 8 is little granule material, connects the material interface according to the grade or can directly connect the dust removal wind to carry to the holding tank body.

In order to protect screen cloth 7 (refer in particular to screen cloth 7 that is close to pan feeding mouth 3), the utility model discloses be provided with the bulk cargo awl 17 that is used for carrying on the bulk cargo on the screening unit that is close to pan feeding mouth 3, the bulk cargo awl 17 sets up at the top of screen cloth 7, can protect screen cloth 7, can also play certain bulk cargo effect simultaneously for the material is through screen cloth 7 with the mode that is close to parallel screen cloth 7 surface, can reduce the impact of material to screen cloth 7 like this, plays the guard action to screen cloth 7.

In order to realize the multistage branch material of material, the utility model discloses in, the screening unit is arranged the setting in proper order along the extending direction of handling passageway 2 in handling passageway 2, and among a plurality of screening units, the screening grade of screen cloth 7 is different, and its concrete appearance is: the mesh diameter of the screen 7 varies on each screening unit.

Specifically, the utility model discloses in processing channel 2 and the screen cloth 7 that corresponds each screening unit all is provided with a guide plate 10 that is used for with material water conservancy diversion to screen cloth 7 to, guide plate 10 sets up around screen cloth 7. The guide plate 10 guides the materials, so that the materials can be gathered, the materials can completely flow through the screen 7 of the screening unit, and the grading of the materials is realized.

Guide plate 10 sets up in main part 1, and guide plate 10 is the multistage formula structure, according to the functional partitioning, guide plate 10 includes two sections, is respectively: a guide plate gathering section 10a connected with the inner side wall of the main body 1 and a guide plate anti-rebound section 10b connected with the guide plate gathering section 10 a.

On the material in the inside flow direction of main part 1, the guide plate gathers together section 10a and forms binding off column structure, can gather together the material of section 10a through the guide plate like this and carry out the water conservancy diversion. On the material in the inside flow direction of main part 1, the anti-bounce section of guide plate 10b forms the opening and gradually puts the formula structure, and the anti-bounce section of guide plate 10b covers the well upper portion at the screen cloth, can gather together the material that the striking rebounded on the screen cloth. Furthermore, all screening units are located in the reverse flow air channel, and the main purpose of the screening unit is to enable materials entering the screen 7 to be blown by wind, so that the dust removal effect is improved.

Specifically, the main body 1 is provided with a plurality of inspection windows 16, the inspection windows 16 are arranged in one-to-one correspondence with the screening units, and the inside conditions of the main body 1 and the service states (whether the screening units are blocked) of the screening units can be inspected through the inspection windows 16.

The utility model discloses set up a plurality of screening units in main part 1, each screening unit all is used for sieving the material of certain particle size within range to realize the classification of material. In this embodiment, the screening unit is provided with a plurality of and arranges the setting in proper order along the extending direction of handling the passageway in handling the passageway, and the screening grade of screen cloth and the bottom outer fringe of screen cloth increase gradually in all screening units from top to bottom orientation. The screening grade is realized by controlling the diameter of the screen hole of the screen; the bottom outer fringe of screen cloth is crescent, specifically means the projection area of screen cloth crescent. Specifically, the screen cloth adopts conical structure, and its bottom is circular edge structure, and when the screening unit was arranged in main part 1, coaxial setting between the screen cloth, like this, the plane of projection of the screen cloth of next stage had covered the plane of projection of the screen cloth of last stage completely, guaranteed that "the material that flows" and cross the last stage screening unit can be received by the screening unit of next stage "completely.

The utility model provides a closed gravity granule multistage separation dust remover the utility model discloses in, this closed gravity granule multistage separation dust remover is provided with dust removal wind entry 5 and dust removal wind export 6 including main part 1 and screening unit in the main part 1, can realize the dust removal purification to the material like this. And simultaneously, the utility model discloses set up the screening unit in main part 1, the screening unit is provided with a plurality ofly, and each screening unit can both carry out the screening separation to the material of different granularities to realize the hierarchical classification of material, can also carry out the screening purification of material once more simultaneously. The screening unit is also provided with an independent discharge pipe 8, and the classified materials can be independently output. The utility model has the advantages of simple structure, compact and reasonable design, can adopt one set of equipment to realize the dust removal and the classification of material simultaneously, and its use is very convenient. Through the structure design, the utility model discloses an it needs the many sets of equipment combined operation to take the operating space big, the big scheduling problem of plant maintenance operation volume that exists to granule class material processing among the prior art to have solved completely to use.

The utility model discloses a charging equipment is with the material from pan feeding mouth 3 input to main part 1 in, take out inside dust through the reverse flow of wind energy in the material whereabouts in-process. In order to uniformly disperse powder in the falling process of the material, a conical distributor, namely a dispersing cone 17, is arranged in the main body 1. Meanwhile, in order to realize the grade screening of the materials, the screen 7 is arranged in the main body 1, the screen 7 is a screen with a framework, then, in the falling process of the materials, the materials are converged by the guide plate 10 and then screened by the screen 7 below, and the screen 7 can realize dust removal and can play a role in screening.

The utility model discloses both realized the dust removal effect of material at material screening in-process, still realized the multistage screening of material simultaneously, guaranteed the cleanliness of material, saved the purchasing cost of equipment, reduced equipment occupation space, reduced construction cost, reduced energy consumption simultaneously, reduced maintenance and running cost. The equipment only carries out classification and dust removal on internal particles through the gravity of the equipment in the operation process, and the effect of multiple functions of one machine is realized.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and simplification made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The utility model provides a closed gravity granule multistage separation dust remover which characterized in that includes:

the device comprises a main body (1), wherein a treatment channel (2) is arranged in the main body, a feeding port (3) communicated with the treatment channel is formed in the top of the main body, a discharging port (4) communicated with the treatment channel is formed in the bottom of the main body, a dedusting air inlet (5) is formed in the lower part of the main body, a dedusting air outlet (6) is formed in the upper part of the main body, and a counter-flow air channel is formed in the treatment channel from the dedusting air inlet to the dedusting air outlet;

the screening unit, the screening unit set up in the processing passageway, the upper portion of screening unit is provided with screen cloth (7), the sub-unit connection of screening unit has discharging pipe (8), the end of discharging pipe set up in outside the main part, warp the material that the screening unit was sieved by the discharging pipe is discharged, and all the other materials by the discharge gate is discharged.

2. The closed gravity particle multistage separation precipitator of claim 1,

the screen is a conical screen;

there is a space between the sieving unit and the side wall of the main body enclosing the processing channel in the radial direction of the main body.

3. The closed gravity particle multistage separation precipitator of claim 1,

the screening unit is located in the countercurrent air duct, and a guide plate (10) used for guiding materials to the screen is arranged around the screen of the screening unit.

4. The closed gravity particle multistage separation precipitator of claim 1,

the lower part of screening unit is provided with aggregate funnel (9), the discharging pipe with aggregate funnel's small-bore end is connected, the screen cloth set up in aggregate funnel's wide-mouth is served.

5. A closed gravity particle multistage separation dust collector as defined in any one of claims 1 to 4,

the screening unit be provided with a plurality ofly and in follow in the processing passageway the extending direction of processing passageway arranges the setting in proper order, is whole in the direction from top to bottom in the screening unit the screening grade of screen cloth with the bottom outer fringe of screen cloth increases gradually.

6. A closed gravity particle multistage separation precipitator as set forth in claim 5,

and a bulk material cone (17) for carrying out bulk material and wear prevention is arranged on the screening unit close to the feeding port.

7. The closed gravity particle multistage separation precipitator of claim 1,

a blanking pipe (11) is arranged in the main body and arranged in the processing channel, one end of the blanking pipe faces the feeding opening, and the other end of the blanking pipe is opposite to the screen of the screening unit close to the feeding opening.

8. The closed gravity particle multistage separation precipitator of claim 7,

one end of the blanking pipe, which faces the screen, is of a reducing type closing structure, and a gathering cover (18) is sleeved outside the blanking pipe;

the gathering cover is arranged in an extending mode relative to the end face of the blanking pipe in the direction of the screen and used for gathering the rebounding materials.

9. The closed gravity particle multistage separation precipitator of claim 1,

an annular pressure equalizing box (12) is arranged on the dedusting air outlet, and an exhaust air pipe (13) is connected with the pressure equalizing box.

10. The closed gravity particle multistage separation precipitator of claim 1,

an inlet air box (14) is arranged on the dedusting air inlet, and an inlet air pipe (15) is connected with the inlet air box.

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