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Cylindrical screen cylinder made of a metal wire cloth or perforated sheet made of, the cylinder axis or slightly inclined about a horizontal axis of rotation. The cylinder is rotated by an electric motor through a chain, a gear or a friction transmission. The advantage of the cylindrical sieve is that the structure is simple, easy to maintain and manage, the work balance is reliable, and the vibration is light; the disadvantage is that the body is bulky, the screen surface is easy to wear, the power consumption is large, the processing amount per unit area is small, the screening efficiency is low, the sieve hole is easy Blockage, the effect of material crushing is large.
Cylinder screens are often used in re-election plants for washing and de-sludge, or for the classification of medium and fine-grained materials. Two or more products are available. But because it is the presence of these shortcomings, the current beneficiation plant has been rarely used, but are generally used in the construction industry to screening and cleaning gravel, sand, but some of the old factories still use such screening equipment.
At present, there are fewer manufacturers of cylindrical sieves in China, mainly Ning Mine in Fujian Province, Yankuang Mine in Jiangxi Province and Changfa Mining Machinery in Hubei Province. The specifications and technical performance of the cylinder screens produced by them are listed in the table. 1~3. In addition, Ningde Factory produces a cylindrical sieve with a diameter of 1.5m and a length of 4.0m, and a wide mine produces YTS700×400 and YTS1200×6000 cylindrical sieves.
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In recent years, Wuhuan Mine has produced a more advanced GT type drum screen. Its working principle is: through the rotation along the axis, the material is sifted and moved forward in the screen cylinder by the angle, and the material is brought into the cylinder. After falling at a certain height, it is beneficial to improve the screening efficiency. The particles remaining on the screen surface of the upper half are dropped, which can effectively prevent clogging. The technical parameters are shown in Table 4.
Features: 1 low speed and smooth rotation, high reliability, low maintenance rate and long life. Not easy to block, suitable for screening of wet materials. 2 The screen area is large, and the materials are alternately contacted, and the overall life of the screen is long. 3 low noise, fully enclosed and no dust pollution. 4 In order to further improve the performance, a high-frequency, low-intensity excitation mechanism has been developed to prevent clogging and increase the screening speed of the half-area screen to increase the yield. 5 can be set to hit the anti-blocking mechanism to further prevent blockage. 6 The cleaning mechanism can be set up, and the residual blockage is forcibly discharged before stopping. Scope of application: It is most suitable for screening coal , coke , white ash and other wet and easy to block materials. The product under sieve can be <10mm, the finest can reach ≤3mm. Suitable for the production of a variety of granular products.
Multi-stage multi-copy plate cylinder screen: The new cylinder screen is produced by Beijing Tsinghua Tiantong Technology Co., Ltd. (hereinafter referred to as Tsinghua Tiantong). The effective working area of ​​traditional cylindrical screening equipment is only 12%~17%. The material movement track is affected by factors such as the rotation speed of the drum, the angle of lifting of the material, and the inclination angle of the drum, so that the effective sizing length of the sifting is small, and the material accumulation and the thickness of the material layer are superimposed. This is the key to the low efficiency of traditional cylindrical sieve screening. The multi-stage multi-plate cylinder screen is placed horizontally, and the material advancement is completed by the partition between the guide and the stage. Therefore, the material is evenly distributed in the cylinder for the effective screening chord length in the cylinder, which increases the effective sieving area of ​​the material per unit area, and increases the effective screening working area of ​​the screen surface to 50%~60%. Therefore, the screening efficiency is improved.
The characteristics of the multi-stage multi-copy plate cylinder sieve are: 1 new structure: uniquely designed multi-stage multi-copy plate structure, which makes the traditional equal-diameter cylinder screen 40t/ at the opening ratio of 30%. The h treatment amount was increased to 120 t/h. 2 High efficiency: Compared with the effective working area of ​​the traditional cylinder screen of 12%~17%, the effective working area of ​​the screen surface is increased by 3.6 times. 3 Small wear: Due to the multi-level and multi-copy plate design, the material movement form has small friction, long service life and low maintenance cost. 4 low energy consumption: reasonable structural design, mechanical transmission loss is small, so only a small power motor is needed. 5Easy to operate: In the recovery and production of Shougang's three blast furnaces, it proves that the equipment is compact, stable, easy to operate and maintain. The hole blocking rate is low due to the mesh follower removal device. 6 Wide application: It adopts high-strength wear-resistant sieve plate, which is suitable for screening of sharp, hard and heavy materials without worrying about deformation and damage of the mesh surface.
The main technical parameters of the multi-stage multi-plate cylinder sieve are listed in Table 5. The sieve has high screening precision and can be used for screening dry materials in various fields. If used in combination with a meshless vibrating screen, it can meet the need for precise separation of large throughput and continuous production.