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1.UHM-type curved screen This curved screen is the advanced equipment imported from the United States RS company by the company. After the company's appraisal, it has reached the American quality standard. It is a fixed arcuate slit screen, can be divided into: â‘ sieve bend heavy medium: mainly used for dewatering coal washing system, sculping and desulfurized; â‘¡ arcuate sieve slurry: mainly used for coal desliming of in advance . In addition, they can be used for the classification of other fine-grained materials.
The structure of the curved screen is shown in Fig. 1. The screen surface has a circular arc shape with an angle of 45 degrees and 60 degrees. The screen mesh is made of stainless steel strip, and the direction of the screen strip is perpendicular to the direction of movement of the slurry.
Working principle: The slurry passes through the feeding box of the curved sieve and is evenly fed along the full width tangential direction of the screen. The flow rate of the slurry supplied to the sieve surface is about 3~6m/s. The slurry moves along the curved screen surface. When the sieve is crossed, the liquid flow collides with the sharp corners of the screen strip, and the tension of the surface water of the particles is destroyed at the angle of the screen strip. Therefore, there is a part of water and fine. The granules are "cut" into a undersize product. As the pulp continues to flow from top to bottom, the under-slurry product is continuously produced, and the liquid flow is gradually thinned. Finally, most of the water and fine-grained materials become the undersize products, and the coarse particles and a small amount of fine particles remain on the sieve surface to become the sieve. On the product.
The curved screen is characterized by simple structure, adjustable screen frame, and 180 degree rotation adjustment, so that it is evenly worn, easy to maintain, and durable, and has high screening efficiency.
At present, the curved screen has been widely used in the coal washing industry in China and has been well received by users.
The main structural parameters of the UHM-type curved screen are listed in Table 1. The main technical properties of the slurry curved screen are listed in Table 2. The main technical properties of the heavy-duty curved screen are listed in Table 3.
2. HX-type curved screen The curved screen is produced by the saddle mine. There are two kinds of specifications. The screen is a curved grid screen, and the stainless steel grid is a trapezoidal section, which is arranged transversely to the flow direction. It is suitable for wet screening and dewatering of fine-grained materials and dewatering and classification in grinding circuits. The technical properties of the curved screen are listed in Table 4, and the shape and installation dimensions are shown in Figure 2.
3. HZ1240 arc vibrating screen The arc screen is produced by the saddle mine and its trajectory is straight. It is suitable for the classification of fine coal or the dehydration and decoupling of coal in the coal preparation plant.
The sieve is a single layer, the sieve surface area is 4.8 m 2 , the sieve surface inclination angle is 0 to 5 degrees, the sieve hole size is 0.4 to 1.5 mm, the sieve mesh structure is a stainless steel slotted sieve surface, and the feeding granularity is ≤25 mm. The processing capacity is 50t/h, the vibration frequency is 960min-1, the double amplitude is 9mm, the vibration direction angle is 45 degrees, the motor power is 4×2 (kW), and the external dimensions (length×width×height) is 4260×2224× 1800 (mm), the machine weight is 3.2t, and the maximum dynamic load is ±7600N. Its shape and installation dimensions are shown in Figure 3.
4. FX-1 type sieve bend the arcuate sieve Kunming Institute of Metallurgy 1988 imitation curved screen in accordance with foreign. It consists of upper and lower screens. The screen is woven with a special nylon or synthetic fiber, called sieve cloth, instead of woven into a square mesh with stainless steel wire or a slotted sieve with trapezoidal stainless steel. hole. The screen cloth is fixed on the frame with the arc plate by the bead and the tweezers plate, and two plastic strips horizontally arranged are arranged at a certain position on the back surface of each screen cloth, which is called a sand bar. In appearance, it consists of an upper box and a lower box, and is bolted in the middle. The upper tank forms the ore portion of the screen and the lower tank is screened (Fig. 4).
The slurry is self-pressed into the slurry distribution box in the upper tank through the pipeline, and the tank is provided with uniformly arranged holes, and the slurry enters the buffer tank from the holes, so that the amount of the slurry flowing out in the hole is relatively uniform, and the opening of the distribution box is A shimming plate is installed to control the slurry flow by adjusting the size of the hole. The slurry is further adjusted by the buffer tank, and the overflow portion passes over the high slab, and flows uniformly along the length direction in a thin layer flow film to the entire sieve surface of the lower tank. This ore feeding method makes the slurry distribution very uniform. . Fine-grained materials smaller than 1/2 of the mesh are mainly passed through the mesh by gravity and centrifugal force. The sieved product is shielded from the screen surface by a hindrance of the sand barrier at a certain position on the back side of the screen cloth, so that the slurry does not form a mucous membrane on the back surface of the screen to block the sieve hole. The optimized design of the arc of the arc plate and the wrap angle is also an important guarantee for reducing the blockage of the mesh. Therefore, the screening efficiency is improved. The slurry on the upper screen surface flows to the lower sieve surface for further screening, so that the screening efficiency is further improved. The upper and lower sieved screened products are combined. The main technical properties of the curved screen are listed in Table 5.
The curved screen started in March 1989 in the industrial testing Kunming Steel iron ore Royal Beach, rated for purchased mine ore pyrite cinder. The screen is made of domestic nylon cloth with a hole diameter of 0.5mm. The ore size is -8mm, and the product under the sieve is 0.15mm. When the ore volume is 15m 3 /h and the slurry concentration is 15%~40%, the screening efficiency is 80%. %the above. The service life of the sieve cloth is about 30 days.
   Table 1  Table 2, 3  Table 4  table 5
   figure 1  figure 2  image 3  Figure 4