As a Mining Plant High Frequency Screen Supplier, share it with you. The
screen is an important part of the vibrating screen. The correct selection and
use of the screen directly determines the gradation and quality of the product.
High-quality screens need to meet the following conditions:
Polyurethane High Frequency Screen for Mining
(1) The material must be a special wear-resistant steel wire. The chemical composition of C and Mn is required to be high enough, while Si, P, and S should be as low as possible. In terms of physical processing, the processing process requires the material to be as uniform as possible in the microstructure, and the heat treatment requires the sorbite structure. If possible, it can be quickly heat treated to the refined austenite structure and then tempered to finer grains. Troostite structure to ensure that the material has high strength, good torsion value and fatigue resistance after processing. Of course, the manufacturing cost is higher.
(2) The weaving form is reasonable, and the process must ensure that the steel wire is woven tightly and must not be loosened.
(3) The external dimensions and edge shape must be correctly matched with the tension plate and the screen frame on the screen.
(4) The screen is flat and the opposite sides are parallel.
(5) The hemming form is reasonable, which is beneficial to the tension of the screen.
Screen blocking is one of the common failures in the operation of vibrating screen. Screen blocking is caused by various factors, including the shape of the stone, the number of critical particles in the mesh, the thickness of the screen wire, and the mesh The shape is one of the factors.
1. The shape of the stone
In the crushed stone production line, the content of needle-like stones should be as low as possible to prevent the phenomenon of blocking holes in the screen. Generally, the stone yard uses secondary crushing. The jaw crusher is used for the first time. Its crushing principle is squeezing and crushing, which is easy to produce flake stone. The second time, an impact crusher is used. Its crushing principle is impact crushing. If the size of the stone crushed by the jaw crusher for the first time is too small, more flakes will be produced. In order to reduce the ratio of needle flakes, the size of the first crushing should not be too small.
2. The matching of the screen mesh hole and the steel wire diameter
Practice has proved that for the same mesh, too thick steel wire will cause a significant increase in the probability of plugging.
3. The shape of the mesh
Screens generally use square holes, and small meshes use anti-blocking holes. If the holes are seriously blocked, rectangular holes can also be used without affecting the particle size of the stone. However, considering the life cycle, the mesh direction must be paid attention to, otherwise it will affect the life cycle of the screen.
4. Reasonably adjust the screen tension
Reasonable adjustment of the screen tension is an effective way to reduce the hole blocking of the screen. Reasonable tension causes the screen to produce a slight secondary vibration with the supporting beam, thereby effectively reducing the occurrence of hole blocking. The specific method is: The tension hook is made into a constant force tensioning mechanism, that is, a spring is installed on the tension bolt.
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