The slurry enters the Wedge Wire Screen Surface along the tangent direction at a certain speed, and the slurry layer moves close to the screen surface due to the centrifugal force.
The direction of the wedge wire is perpendicular to the direction of the material flow.When the slurry layer flows from one wedge wire to another, the edges of the wedge wire have a cutting effect on the slurry layer.Under the action of centrifugal force, it is discharged through the screen gap and becomes the product under the screen. The part of the slurry that has not been cut passes through the wedge wire and becomes the product on the screen.
The thickness of the flow beam under the screen cut by each wedge wire is about one-fourth of the width of the screen gap. The maximum particle size of the product under screening is twice as large as the beam thickness. Therefore, the grading size of the sieve bend screen is about half of the screen gap size.
From the working principle of the DSM Screen/arc screen, it can be seen that the edge of the wedge wire of the existing sieve bend screen has a cutting effect on the slurry so that the wedge wire is easy to wear and the service life is shortened.
Moreover, the under-screen yield will be significantly reduced after the edge of the wedge wire is worn. And in the feeding part of the screen, because the horizontal projection area of the screen gap is very small, it can hardly play the role of dehydration and classification, which reduces the usable area of the screen and affects the dehydration effect.
The purpose of the utility model is to provide a sieve bend screen for coal preparation with a better dewatering effect and higher screening efficiency in view of the shortcomings of the prior art.
To achieve the above purpose, the following technical scheme is adopted, which is a DSM screen for coal preparation, including a wedge wire, a support bar, and angle steel.
The wedge wire is fixedly connected with the support bar, and its two ends are fixedly connected on the angle steel to form a screen.
The wedge wire is an arc structure, and the arc inner surface formed by a plurality of wedge wires of the arc structure is a working screen surface, and the wedge wire direction of the working screen surface is consistent with the material flow direction.
As an optimal scheme, the width of the screen gap size formed between the wedge wire is equal to the size of the coal preparation classification.
As a preferred scheme, the plurality of V wire is longitudinally arranged and fixed on the support strip with equal spacing, and the support rod is perpendicular to the V wire.
By adopting the above technical scheme, compared with the prior art, the direction of the wedge wire of the working screen surface of the utility model is consistent with the direction of the material flow, the edge of the wedge wire will not have a cutting effect on the slurry, the wear condition is improved, and the service life is prolonged.
The effective use area of the screen of the utility model is increased compared with the existing screen and has the advantages of good dehydration effect and high screening efficiency.
The utility model is further described below. The embodiment is a sieve bend screen used for coal washing in a coal preparation plant, and the consolidation mode of each part of the embodiment is welding.
The utility model is composed of a wedge wire and a support strip. The two ends of the screen bar are welded on the angle steel respectively, and the bottom is welded with the support bar respectively to form the screen.
The screen bar is an arc-shaped structure, and the arc-shaped inner surface formed after welding is the working screen surface, which is composed of the support bar direction and the material flow direction To the same direction.
A group of wedge wire with a certain radian are evenly welded on the straight support strip with 90 ° angle to the direction of the screen strip with the same spacing, and the two ends of several screen strips are welded on the angle steel respectively to form a screen, and the screen is fixed on the screen frame.
During installation and use, the direction of the screen bar is consistent with the direction of the material flow. When working, the direction of several wedge wire forming the working screen surface is consistent with the direction of material flow.
After the slurry enters the working screen surface at a certain speed, because the wedge wire of arc structure is consistent with the direction of material flow, the slurry passes through the screen directly, and the products on the screen are discharged from the outlet of the products on the screen, and the products under the screen are discharged from the outlet of the products under the screen. The dewatering effect is good and the screening efficiency is high.
