CN2250820Y - Probability bar screen - Google Patents

Abstract

The utility model relates to a probability bar screen which belongs to the device of industrial screening, and is composed of a screen box, a bar screen face, a torsion bar and a walking support frame, etc. The utility model is characterized in that the structural form of the existing bar screen face which is designed into a two-layer structure; an upper and a lower layers of rods are arranged in a stagger and overlapped way, and form an angle around the torsion bar, causing material to be screened in the state of three dimensional space forming V-shaped radial shape. Because of the change of the structure of the bar screen face, the effective screening area of the screen face and the penetration screening probability of material particles can be enlarged, and the processing power and the screening efficiency of the device can be increased.

Description

The probability bar screen

The utility model belongs to a kind of industrial screening equipment.

Bar screen is the capital equipment of broken preceding prescreening in the ore dressing plant.At present, both at home and abroad roughly have two types in the bar screen that uses: one type is friction formula bar screen, can be divided into fixed in this type bar screen again and two kinds of cantilevereds, and they and chain type feeding machine are used.Facts have proved that screening effect is very undesirable, it is poor that material sieves thoroughly, easily stops up, and screening efficiency is low, is eliminated gradually; Second type is the vibrating head bar grizzl(e)y, it is to drive eccentric by electric energy to produce vibration to improve screening efficiency, prevent to stop up, say in a way, than friction formula bar screen certain progress has been arranged, but it exist exciting force big, can pass to the very big oscillating load of building, itself compass screen surface structure also necessarily requires higher strength and stiffness.Therefore, the quantity of compass screen surface crossbeam and section dimension requirement strengthen, and cause the compass screen surface effective sifting area to reduce undoubtedly, seek out larger part and bury ability, certainly will increase cover surface, and the increase of cover surface requires working space to strengthen thereupon.In addition then, influenced by exciting force, the compass screen surface quick abrasion.

The purpose of this utility model is the technical measures of taking at the drawback of above-mentioned two types of bar screens existence, a kind of novel probability bar screen is provided, change the structural shape of bar screen compass screen surface in the past, the material that is sized is carried out under the solid space state, compare with the same specification bar screen, about its sieving area nearly doubles, screening percentage height, the difficult obstruction, screening efficiency obviously strengthens.

Probability bar screen of the present utility model is to be made of four parts such as screen box, rod compass screen surface, torque arm and mobile roof supports.Screen box is designed to totally-enclosed chute type structure.The rod compass screen surface is double-deck cantilevered, it is the staggered stacked layout of rod up and down, and it is equidistant to be parallel to each other between every layer of rod, all rods all are fixed on the torque arm, difference according to screen size, levels rod axial line can be simultaneously by the axial line of torque arm, also can be not in the take-up of same axle.Facts have proved that upper strata rod spacing should be advisable greater than 1.25 times of undersize degree, the initial velocity when upper strata rod and horizontal plane angle should enter compass screen surface according to material and the angle of friction of material and compass screen surface are determined.Upper strata rod and lower floor's rod spaced winding torque arm form an angle, and this angle is relevant with the undersize degree that is sized material, and promptly two-layer rod is combined into the V-type compass screen surface, make the screen size that is radial compass screen surface end must not be greater than the undersize degree.The rod compass screen surface of this kind pattern, on the material thing direction of motion, levels rod spacing (sieve aperture) is outwards enlarged gradually by little.Because upper strata rod spacing is greater than the undersize degree of material, the critical particle of difficult sieve becomes easy sieve particle in the material, saturating sieve probability obviously increases, material less than critical particle enters (between the levels rod) in the V-type district, saturating continuously sieve in being radial sieve aperture, the material of defective granularity is removed by being sized between upper strata rod and levels rod.In order to improve sieving capacity and effect, the hop count of compass screen surface can be one or more snippets, and hypomere compass screen surface horizontal sextant angle is equal to or less than epimere compass screen surface horizontal sextant angle.As for the physical dimension of compass screen surface (two-layer rod), the factors such as character of its device processes ability, material of should looking during design are determined.The torque arm that is used for fixing rod, be supported on the top of screen box by sliding bearing, at screen box both sides external face, the two ends of torque arm are provided with the pull handle that fixes with it respectively, realize adjusting the angle of compass screen surface by the thickness that changes rubber spring on the pull handle, to adapt to material screening of different nature, another purposes of rubber spring is when material impacts compass screen surface, can make compass screen surface produce vibration, help the material loosening on the compass screen surface.Mobile roof support mainly is to be used for supporting screen box and mobile complete machine.

Describe the structure of the present utility model and the course of work in detail below in conjunction with accompanying drawing.Embodiment is two sections probability bar screens, and accompanying drawing is a structure principle chart of the present utility model.As shown in the figure: gape 9, peep hole 10, dedusting air-vent 11 on screen box 1, rod 2, rubber spring 3, pull handle (4), feed port 5, torque arm 6, the following gape 7 of sieve, mobile roof support 8, the sieve.During the work of probability bar screen, material enters screen box 1 by feed port 5, drop on the V-type compass screen surface of being made up of double-deck rod 2, through instantaneous screening, two kinds of situations appear in material simultaneously: the one, and remain on the rod of upper strata, mostly directly fall into two sections rod compass screen surfaces for the material of defective granularity; Another kind is that the material less than rod slit, upper strata enters on the V-type compass screen surface of being made up of the levels rod, the release mesh material sieves in ascending, radial sieve aperture thoroughly, fall into sieve gape 7 down, defective granularity material falls into two sections compass screen surfaces by the V-type compass screen surface.Two sections sieves are identical with the screening process of one section sieve, and the oversize material enters disintegrating machine through sieving extension mine mouth 9.The inclination angle of compass screen surface is by being fixed on pull handle 4 on the torque arm 6, being achieved by the thickness that changes the rubber spring 3 on the pull handle 4.Screen box 1 supports and moves by mobile roof support 8.Screen box 1 lip-deep peep hole 10, dedusting air-vent 11 play the dedusting of observing in screening situation and the screen box 1 respectively.

Show through industrial practice: the utlity model has simple in structure, characteristics such as volume is little, cheap, difficult obstruction.Compare with two types of bar screens of existing same specification, its disposal ability is respectively their 8 times, 6 times, and screening efficiency improves 25% and 10% respectively.

Claims (3)

1, a kind of industrial screening probability bar screen is made of four parts such as screen box, rod compass screen surface, torque arm, mobile roof supports, it is characterized in that the rod compass screen surface is a double-decker, the staggered closed assembly of levels rod is arranged, and be fixed on the torque arm, between two-layer rod, form an angle around torque arm.

2, by the described probability bar screen of claim 1, it is characterized in that torque arm is to rely on sliding bearing to be supported on screen box top, the both ends of bar respectively are provided with a connected pull handle, by changing the thickness of rubber spring on the pull handle, realize adjusting the angle of rod compass screen surface.

3, by claim 1 or 2 described probability bar screens, it is characterized in that the rod compass screen surface can be multistage.

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