SU940866A1

SU940866A1 - Screw screen

Info

Publication number: SU940866A1
Application number: SU803007618A
Authority: SU
Inventors: Николай Григорьевич Картавый; Владимир Генадьевич Маслобоев; Александр Львович Степанов
Original assignee: Московский Ордена Трудового Красного Знамени Горный Институт
Priority date: 1980-11-13
Filing date: 1980-11-13
Publication date: 1982-07-07

Description

(54) ВИНТОВОЙ, ГРОХОТ(54) SCREW, SCREAM

Изобретение относитс к технике сортировки зернистых материалов и может быть использовано в горной промышленности , промышленности строительных материалов , а также в других отрасл х народного хоз йства.The invention relates to the technique of sorting granular materials and can be used in the mining industry, the building materials industry, as well as in other areas of the national household.

Известен винтовой грохот дл разделени зернистых материалов по фракци м, включающий пр мую винтовую поверхность , смонтированную в цилиндрическом корпусе, загрузочное и разгрузочное устройства , вибратор. Корпус грохота крепитс на основании упругими элементами 1.A screw screen for separating particulate materials into fractions, including a straight helical surface mounted in a cylindrical housing, a loading and unloading device, and a vibrator. The screen case is fixed on the basis of elastic elements 1.

Просеивающа поверхность этого грохота вьшолнена из плетеной сетки с квадратными чейками. Материал под воздействием направленных колебаний, создаваемых вибратором, поднимаетс по просеивающей поверхности и рассеиваетс при этом на несколько фракций.The screening surface of this screen is made of a woven mesh with square cells. The material under the influence of directional vibrations created by the vibrator rises along the screening surface and disperses in this case into several fractions.

Недостатком такого грохота вл етс низка эффективность грохочени , так как В нем имеютс застойные зоны, ухудшающие качество рассева. Это вл етс следствием того, что грохот имеет пр мую винтовую поверхность и материал по мере его движени скапливаетс у внутренней части просеивающей поверхности.The disadvantage of such a screen is the low screening efficiency, since it has stagnant zones that deteriorate the quality of screening. This is due to the fact that the screen has a straight screw surface and the material accumulates as it moves against the inside of the screening surface.

Наиболее близким по технической сущности к предлагаемому грохоту вл етс винтовой грохот, включающий винтовую просеивающую поверхность, смонтирова:н5 ную между внешним и внутренним цилИндрами , образующими корпус, который крепитс на основании упругими элементами . Такой грохот имеет вибраторы,плоскости действи которых взаимно перпендикул рны. Вибраторы создают круговые колебани как в горизонтальной, так и в вертикальной плоскост х. Под действием веса материала и сил, создаваемых вибраторами , частицы материала совершаюг The closest in technical terms to the proposed screen is a helical screen, including a screw screening surface, mounted: N5 between the outer and inner cylinders, forming the body, which is mounted on the base of elastic elements. Such a screen has vibrators, the planes of action of which are mutually perpendicular. Vibrators create circular oscillations in both horizontal and vertical planes. Under the influence of the weight of the material and the forces generated by the vibrators, the particles of the material make

15 сложное трехмерное движение, раздел сь при этом на две фракции: надситный и подситный продукты 2.15 complex three-dimensional motion, divided into two fractions: supitite and sub-pitched products 2.

Этот грохот имеет пр мую винтовую просеивающую поверхность и материал в This screen has a straight screw screening surface and material in

20 процессе движени скапливаетс у внутренней части винтовой поверхности грохота , что ведет к образованию зон засто , следствием чего вл ютс уменьшение производительности и снижение эффективности грохочени . Частично этот недоста25 ток устран етс за счет колебаний, создаваемых вибраторами во взаимно перпендикул рных плоскост х, но это сильно усложн ет конструкцию и требует затрат 20, the movement process accumulates at the inner part of the screw surface of the screen, which leads to the formation of stagnation zones, resulting in a decrease in productivity and a decrease in screening efficiency. Partially, this deficiency is eliminated due to oscillations created by vibrators in mutually perpendicular planes, but this greatly complicates the design and is costly.

Claims

30 electricity. The aim of the invention is to increase the efficiency of screening for mixing the material. The goal is achieved by the fact that in a screw screen containing a rifle a screening surface, installed in a housing formed by external and internal cylinders, loading and unloading pipes, a screening surface screw is formed by separate elements, each of which is set at an angle to the vertical axis of the screen, wherein the elements are alternately tilted in different directions and mixed vertically relative to each other, while the angle of inclination of the element to the vertical axis of the rumble is made variable. In addition, the angle of inclination of the first element from the side of the loading nozzle is reduced to 0 °, and the next increases from 0 °. Each individual element can be made in the form of a fourth part of a full turn. FIG. 1 shows a screw screen, front view; in fig. 2 - section A-A of FIG. 1. The proposed screen contains a screw screening surface 1 mounted between the outer 2 and the inner 3 cylinders forming the screen body. The body is rigidly mounted on the base 4 and has a loading 5 and two unloading nozzles 6 and 7. The screening surface consists of four elements, each of which is the fourth part of a spiral turn. The screening surface of each element is assembled from the links of the slit grid and fits tightly with the peripheral part to cylinder 2, and the internal part to cylinder 3. Each element has a variable angle of inclination of the helical surface, which varies from a positive value (-b) to zero (ip 0) on the first element, further from zero (P 0) to negative () on the second element; this is repeated on the third and fourth elements respectively. The elements are offset from each other vertically by an amount h, depending on the physical properties of the material to be sieved. The roar works as follows. The material to be sieved is fed through the pipe 5 to the screening surface. Under the action of the rolling force, the material entering the peripheral part of the first element moves downward, evenly spreading over the surface, since the tilt of the screw surface at the end of the first element is zero. Moving along the second element, having a negative angle of inclination of the screw surface in the ring, the material is concentrated near the peripheral surface. On the third and fourth elements, this picture is repeated respectively. When the material is cooled by the four elements, it “roars over the surface from the periphery to the center at a positive angle of inclination and from the center to the periphery at a negative angle of inclination of the screw surface. Subsidic product "fraction I is removed through pipe 6, and overhead product" fraction II through pipe 7. Due to the fact that the elements have a screw surface with a varying angle of inclination, the vector of the flow velocity of the moving material is directed from the periphery to the center of the surface on the first element and from the center to the periphery on the second element; this pattern is repeated on the third and fourth elements respectively. Alternately changing the direction of the velocity vector of the moving material contributes to a more uniform distribution and mixing of the material on the screw surface as it moves, which leads to an increase in screening efficiency. In addition, increasing the speed of the moving material at the beginning of the cascade due to the difference between them helps to eliminate the zones of stagnation, which in turn leads to an increase in the performance of the rumble. The application of the proposed screen allows to increase screening efficiency, simplify the design and reduce energy costs. Claim 1. Screw screen containing a screw screening surface mounted in a housing formed by internal and external cylinders, loading and unloading nozzles, characterized in that, in order to increase screening efficiency by moving the material, the screw screening surface is formed by separate elements. , each of which is set iod angle to the vertical axis of the rumble, and the elements are alternately tilted in different directions and shifted relative to each other vertically, with e The volume of the inclination of the element to the vertical axis of the screen is made variable.

2. A screen according to claim 1, characterized in that the angle of inclination of the first element on the side of the loading nozzle is reduced to 0 °, and the next increases from 0 °.