CN107876378B

CN107876378B - Equal-thickness flip-flow screen with small occupied space

Info

Publication number: CN107876378B
Application number: CN201711033571.5A
Authority: CN
Inventors: 刘初升; 武继达; 邹梦麒; 王振乾; 邱文强; 赵薇; 洪瑞; 黄卓; 杨晓东
Original assignee: China University of Mining and Technology CUMT
Current assignee: China University of Mining and Technology CUMT
Priority date: 2017-10-30
Filing date: 2017-10-30
Publication date: 2020-07-24
Anticipated expiration: 2037-10-30
Also published as: CN107876378A

Abstract

The utility model provides an equal thickness relaxation sieve that occupation space is little, include a plurality of crossbeam (1) and prop up a plurality of sieve (2) of establishing between adjacent crossbeam (1), the distance between adjacent crossbeam (1) equals, a plurality of sieve (2) are by pan feeding end to discharge end section by section constitute a plurality of sifting unit (3) in proper order, sieve width is by pan feeding end to discharge end section by section in proper order and is increased progressively in a plurality of sifting unit (3), and the sieve thickness of a plurality of sifting unit (3) is by the pan feeding end to the discharge end section by section in proper order and decrease progressively. The structure is beneficial to the small height of the whole machine, can reduce the occupied space of the flip-flow screen, can be convenient for adjusting the inclination angle of the screen surface, can effectively improve the screening efficiency and increase the treatment capacity, and can be convenient for maintenance.

Description

Equal-thickness flip-flow screen with small occupied space

Technical Field

The invention relates to a relaxation sieve, in particular to an equal-thickness relaxation sieve which occupies small space.

Background

Coal sorting is a necessary process in the production, processing and selling process of coal, and raw coal can be separated into commodity coal with different particle sizes through sorting so as to meet the requirements of different purposes; meanwhile, various impurities such as gangue mixed with raw coal are separated, the sulfur content and ash content of commercial coal are reduced, and the coal quality is improved. Screening is an important component of a coal sorting process, and with the trend of clean and efficient utilization of coal, development of an efficient and reliable deep screening technology has important environmental protection and practical significance. Compared with the traditional vibrating screen, the relaxation screen depends on the reciprocating flexing motion of the polyurethane elastic screen surface, the screen surface has large amplitude, high projection strength and strong anti-blocking capability of the screen surface, has better screening effect on sticky wet fine coal, and is widely applied to the field of deep coal screening. Along with the development trend of large-scale coal preparation plants, the requirement on the processing capacity of separation equipment is gradually improved, and in order to improve the unit area processing capacity, an equal-thickness screening principle is increasingly favored, and the constant-thickness screening principle is characterized in that the screen surface of a feeding end is steep, the throwing strength is high, and the feeding speed is high; the discharge end sieve surface is gentle, the throwing intensity is small, and the material running speed is slow. Under the condition of equal-thickness screening, the phenomenon of material accumulation at the effective feeding end can be eliminated, and the thickness of a material layer on the screen surface is uniform, so that the utilization rate of the screen surface is improved, and the processing capacity is greatly improved on the premise of not increasing the area of the screen surface. At present, flip-flow sieves utilizing the equal thickness principle are all structural forms by using the traditional linear vibration equal thickness sieve, the main structure of the existing flip-flow sieves adopts a multi-section broken line type arrangement beam, so that the included angle between each section of sieve surface and the horizontal plane is gradually reduced from a feeding end to a discharging end, the running speeds of materials at different positions are changed to realize equal thickness sieving, but the form causes the height of the whole machine to be larger, higher workshop space is needed, and the occupied space is large; the inclination angles of all the sections are relatively fixed, and meanwhile, the inclination angles are difficult to adjust; in addition, the structure of the flip-flow screen is complex, and the maintenance process is inconvenient.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides the equal-thickness flip-flow screen which occupies small space, the structure is beneficial to the small height of the whole machine, the occupied space of the flip-flow screen can be reduced, meanwhile, the structure can facilitate the adjustment of the inclination angle of the screen surface, the screen penetrating efficiency can be effectively improved, the processing capacity can be increased, and the maintenance can be facilitated.

In order to achieve the purpose, the equal-thickness relaxation screen with small occupied space comprises a plurality of cross beams and a plurality of screen plates erected between the adjacent cross beams, the distances between the adjacent cross beams are equal, the screen plates sequentially form a plurality of screen surface units section by section from a feeding end to a discharging end, the screen plate widths of the screen surface units are sequentially increased section by section from the feeding end to the discharging end, and the screen plate thicknesses of the screen surface units are sequentially decreased section by section from the feeding end to the discharging end.

Under the condition that the distance between the cross beams and the relative amplitude are fixed, the width of the sieve plate has a remarkable influence on the amplitude and the throwing strength of the sieve surface of the relaxation sieve, the width of the sieve plate is reduced, the amplitude of the midpoint of the sieve surface is increased, and the throwing strength is correspondingly increased; and vice versa. Therefore, on the premise of not changing the space and the relative amplitude of the cross beams, the arrangement mode that the width of the sieve plate of the flip-flow sieve is gradually increased from the feeding end to the discharging end can realize that the amplitude and the throwing strength of the flip-flow sieve are gradually reduced from the feeding end to the discharging end. In the screening process, the materials at the feeding end of the relaxation screen are more and are easy to accumulate, so that the amplitude and the throwing strength of the feeding end are increased, and the materials at the feeding end can be quickly layered, transported and screened; along with the progress of screening, along the material moving direction, material on middle part and discharge end sieve reduces gradually, suitably uses less amplitude and throwing intensity to prolong the dwell time on the sifting surface, increase the rate of penetrating sieve. The action of the impact force of the materials on the screen surface is directly related to the throwing strength acting on the materials, so that the thickness of the screen plate is designed and distributed according to the rule that the thickness of the screen plate is gradually reduced from the feeding end to the discharging end of the relaxation screen corresponding to the distribution rule of the throwing strength, and the approximate equal-strength arrangement is realized. The angles of the whole screen surface in the structure are the same, so that the adjustment of the dip angle of the flip-flow screen can be facilitated, and the maintenance can be facilitated.

Further, for can make the structure simpler under the prerequisite of ensureing the uniform thickness screening effect, the quantity of sifter unit is three, and the sieve width ratio of the three sifter unit that distributes to the discharge end by the pan feeding end is 0.75: 1: 1.25.

in order to further improve the screen penetration rate and improve the treatment capacity, the thickness ratio of the screen plates of three screen surface units distributed from the feeding end to the discharging end is 5: 4: 3.

furthermore, in order to fix the sieve plate more firmly and improve the stability of the flip-flow sieve, the plurality of cross beams are composed of a plurality of fixed beams and a plurality of floating beams which are arranged at intervals, the cross beams are of hollow structures, the left end and the right end of each cross beam are fixedly connected with limiting plates, and the tops of the cross beams are fixedly connected with clamping grooves extending along the length direction of the cross beams; the link of every sieve all is connected with the crossbeam through the cooperation of support frame and draw-in groove, the support frame includes the layering of crimping on sieve link upper portion, is located round tubular beams and the bolt of fixed connection and pass round tubular beams, sieve link and layering in the draw-in groove between sieve link lower part and the draw-in groove upper end in proper order. The layering can protect the screen surface better and the connecting portion of screen surface support frame, prevents to be worn and torn by the material. And meanwhile, normal pressing force is provided, and loosening of the screen surface is avoided.

Furthermore, in order to improve the equal-thickness screening efficiency, the included angle between the horizontal plane and the connecting line from the middle part of the feed end beam to the middle part of the discharge end beam is 15-30 degrees.

Preferably, the sieve plate is a polyurethane sieve plate.

The flip-flow screening machine has the advantages of small height, small occupied space, high screening efficiency and large treatment capacity, and can be suitable for efficient dry screening of wet fine materials.

Drawings

FIG. 1 is a schematic structural view of the present invention;

fig. 2 is a schematic structural view of a screen deck assembled between adjacent cross beams and an upper portion thereof according to the present invention;

FIG. 3 is a schematic view of a connecting structure of a sieve plate connecting end and a cross beam through a support frame;

fig. 4 is a partially enlarged view of a portion a in fig. 3.

In the figure: 1. Crossbeam, 2, sieve, 3, sifting unit, 4, fixed beam, 5, floating beam, 6, limiting plate, 7, draw-in groove, 8, layering, 9, pipe roof beam, 10, bolt, 11, rust-resistant nut.

Detailed Description

The invention will be further explained with reference to the drawings.

As shown in figure 1, an equal thickness relaxation sieve that occupation space is little, including a plurality of crossbeams 1 and prop up a plurality of sieve 2 of establishing between adjacent crossbeam 1, the distance between adjacent crossbeam 1 equals, and a plurality of sieve 2 is by the pan feeding end to the discharge end section by section constitute a plurality of sifting unit 3 in proper order, and the sieve width of a plurality of sifting unit 3 is by the pan feeding end to the discharge end section by section in proper order and increase progressively, and the sieve thickness of a plurality of sifting unit 3 is by the pan feeding end to the discharge end section by section in proper order and decrease progressively.

Under the condition that the distance between the cross beams and the relative amplitude (relaxation amount) are fixed, the width of the sieve plate has a remarkable influence on the amplitude and the throwing strength of the sieve surface of the relaxation sieve, the width of the sieve plate is reduced, the amplitude of the midpoint of the sieve surface is increased, and the throwing strength is correspondingly increased; and vice versa. Therefore, on the premise of not changing the distance between the cross beams and the relative amplitude (relaxation amount), the arrangement mode that the width of the screen plates of the relaxation screen is gradually increased from the feeding end to the discharging end can realize that the amplitude and the throwing strength of the relaxation screen are gradually reduced from the feeding end to the discharging end. In the screening process, the materials at the feeding end of the relaxation screen are more and are easy to accumulate, so that the amplitude and the throwing strength of the feeding end are increased, and the materials at the feeding end can be quickly layered, transported and screened; along with the progress of screening, along the material moving direction, material on middle part and discharge end sieve reduces gradually, suitably uses less amplitude and throwing intensity to prolong the dwell time on the sifting surface, increase the rate of penetrating sieve. The action of the impact force of the materials on the screen surface is directly related to the throwing strength acting on the materials, so that the thickness of the screen plate is designed and distributed according to the rule that the thickness of the screen plate is gradually reduced from the feeding end to the discharging end of the relaxation screen corresponding to the distribution rule of the throwing strength, and the approximate equal-strength arrangement is realized.

In order to make the structure simpler under the prerequisite of guaranteeing the uniform thickness screening effect, the quantity of sifting surface unit 3 is three, and the sieve width ratio of three sifting surface unit 3 that distributes to the discharge end by the pan feeding end is 0.75: 1: 1.25.

in order to further improve the screen penetration rate and improve the treatment capacity, the thickness ratio of the screen plates of the three screen surface units 3 distributed from the feeding end to the discharging end is 5: 4: 3.

in order to fix the sieve plate more firmly and improve the stability of the flip-flow sieve, as shown in fig. 2 to 4, a plurality of cross beams 1 are composed of a plurality of fixed beams 4 and a plurality of floating beams 5 which are arranged at intervals, the cross beam 1 is of a hollow structure, the left end and the right end of the cross beam 1 are both fixedly connected with limiting plates 6, and the top of the cross beam 1 is fixedly connected with a clamping groove 7 which extends along the length direction of the cross beam; the link of every sieve 2 all is connected with crossbeam 1 through the cooperation of support frame and draw-in groove 7, the support frame includes the layering 8 of crimping on 2 link upper portions of sieve, is located the pipe roof beam 9 and the bolt 10 of fixed connection in draw-in groove 7 and pass

pipe roof beam

9, 2 link of sieve and layering 8 in proper order between 2 link lower parts of sieve and the draw-in groove 7 upper end. The bolt 10 can be a T-shaped bolt, and can be fixedly assembled in the clamping groove 7 in advance to facilitate the sleeving of the round tubular beam 9, the connecting end of the sieve plate 2 and the pressing strip 8, and the upper end of the pressing strip 8 can be fixed through an antirust nut 11. The layering can protect the screen surface better and the connecting portion of screen surface support frame, prevents to be worn and torn by the material. And meanwhile, normal pressing force is provided, and loosening of the screen surface is avoided.

In order to improve the equal-thickness screening efficiency, the included angle between the horizontal plane and the connecting line from the middle part of the feeding end beam 1 to the middle part of the discharging end beam 1 is 15-30 degrees.

Preferably, the sieve plate 2 is a polyurethane sieve plate.

Claims

1. The utility model provides an equal thickness relaxation sieve that occupation space is little, include a plurality of crossbeams (1) and prop up a plurality of sieve (2) of establishing between adjacent crossbeam (1), its characterized in that, the distance between adjacent crossbeam (1) equals, a plurality of sieve (2) are by the pan feeding end to the discharge end section by section constitute a plurality of sifting unit (3) in proper order, sieve width is by the pan feeding end to the discharge end section by section in proper order and is progressively increased progressively in a plurality of sifting unit (3), and the sieve thickness of a plurality of sifting unit (3) is by the pan feeding end to the discharge end section by section in proper order and progressively decrease progressively.

2. A low footprint iso-thickness relaxation screen as claimed in claim 1, characterized in that said screen surface units (3) are three in number, the ratio of the screen deck widths of the three screen surface units (3) distributed from the inlet end to the outlet end being 0.75: 1: 1.25.

3. a low footprint iso-thickness relaxation sieve as claimed in claim 2, characterized in that the ratio of the sieve plate thickness of the three screening surface units (3) distributed from the inlet end to the outlet end is 5: 4: 3.

4. the equal-thickness relaxation and relaxation sieve with small occupied space according to any one of claims 1 to 3, characterized in that a plurality of cross beams (1) are composed of a plurality of fixed beams (4) and a plurality of floating beams (5) which are arranged at intervals, the cross beams (1) are of a hollow structure, the left and right ends of the cross beams (1) are fixedly connected with limit plates (6), and the tops of the cross beams (1) are fixedly connected with clamping grooves (7) which extend along the length direction of the cross beams; the link of every sieve (2) all is connected with crossbeam (1) through the cooperation of support frame and draw-in groove (7), the support frame includes layering (8), the pipe roof beam (9) and the fixed connection that are located between sieve (2) link lower part and draw-in groove (7) upper end of crimping in sieve (2) link upper portion and pass bolt (10) of pipe roof beam (9), sieve (2) link and layering (8) in proper order in draw-in groove (7).

5. The equal-thickness relaxation and relaxation sieve with small occupied space as claimed in claim 4, characterized in that the included angle between the horizontal plane and the connecting line from the middle part of the feeding end beam (1) to the middle part of the discharging end beam (1) is 15-30 degrees.

6. A low footprint iso-thickness relaxation sieve as claimed in claim 5, characterized in that said sieve plate (2) is a polyurethane sieve plate.