The sieve bends is mainly used for material classification, dehydration and medium removal in coal mine and other industries. Due to the centrifugal force, the material layer moves close to the screen surface. When the material layer flows from one screen bar to another, the edges of each screen bar cut the material layer. Under the centrifugal force, the cut material is discharged through the screen gap and becomes the undersize material; The part of the material that has not been cut passes through the root sieve bar and becomes the material on the sieve.
The arc vibrating screen is a fixed slot screen with a certain radius of curvature and wrap angle. It has no moving parts, and its structure is simple, but its handling capacity is large. The sieve bends plays the role of dehydration, disintermediation, desliming and grading slime recovery in the coal preparation process. According to the different feeding methods, it can be divided into two types: one is the gravity flow sieve bends with no pressure feeding;
The other is the pressure sieve bends with pressure feeding. The arc-shaped screen is mainly composed of a group of arc-shaped screen surfaces, feeders, discharge funnels, supports and other parts with horizontally arranged screen bars. The screen bar used to make the screen surface of the sieve bends is a trapezoidal screen bar, and the layout direction of the screen bar is perpendicular to the movement direction of the slurry on the screen surface. The screen bars are generally made of stainless steel, sometimes nylon.
Due to the large drainage capacity of the sieve bends, many coal preparation plants often use the sieve bends for pre dehydration before the dewatering screen. The screen gap is generally 3~6 times larger than that of the dewatering screen in the next process, but should not exceed 3mm. The width of the sieve bends shall be 150~200mm smaller than that of the dewatering screen in the next process. The sieve bends can also be used in series as required.
Due to the continuous improvement of the design, the manufacturer has also designed an sieve bends with a pivot steering structure for the screen frame, which can rotate 180 °, extending the service life of the screen surface. In addition, experts have also developed a two-way sieve bends, which is composed of a vibrating motor, a distributor and a screen box. It is characterized by that the screen box is composed of two side plates, branch steel pipes, two screens installed in reverse direction and a separating plate;
The screen mesh is fixed on one end of the steel pipe of the branch mesh through the batten and wooden wedge, the other end of the steel pipe of the branch mesh is fixed on the base, and the side plate is connected with the base; The vibrating motor is installed outside the screen box, and the distributor is installed on the top of the screen box. This two-way sieve bends uses two screens, which not only improves the processing capacity of the sieve bends, but also makes the screening efficiency of the sieve bends higher and it is very convenient to replace the screen.
