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 Wysłany: Sob 11:47, 06 Lis 2010 Temat postu: ugg schuhe deutschland Thin seam efficiency workin |
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Thin seam efficiency working face equipment safety management measures have been
Load side of the moving parts of the variable-bit quality; F - tensioning. By (6) and equation (7) have driven conveyor rigid tension of starting automatically when the control law for the F = 2 (a 1) [i + ie2 + (m + mke pull) port (t)] (8 ) combined with equation (2) and type (4), starting with Harrison's speed, automatic tensioning device control law for the F = 2 (a 1) [+ i + (m + mk) xsin] (9) n the jL Nordell's start with speed, automatic tensioning device control law for the F = 2 (a 1) [+ i + (m + mk) x4vf] (0 ≤ f ≤) F: 2 (e2 \,+ ie2 + (m + me pull) × (10) (1 hand] T ≤ ≤) 3 tracks ranging from start-rigid multi-pulley drive automatic tensioning force of the state of rigid double-drum drive, if the two driving roller diameter equal I as a roller drum Ⅱ is a continuation. At this point the tube roller wrap angle Ⅱ are all gliding arc,[link widoczny dla zalogowanych], there is only drum I still arc, but this time on the adhesive roller Ⅱ I wear much faster than the drum. Therefore, the actual production of conveyor rollers Ⅱ often make slightly smaller than the diameter of rollers I, if the difference between the two drum diameter AD = D A D: AD increases to a certain critical value, the two still exist on the drive roller arc, the drum Ⅱ wear a smaller, two-drum drive I: Ⅱ = a EAADL where E,[link widoczny dla zalogowanych], A - conveyor belt elastic modulus and cross-sectional area. Then available to ensure the existence of two drive rollers are stationary arc,[link widoczny dla zalogowanych], the minimum initial tension belt s ≥-W-EAADL (11,) ≥ - D from (2), equation (7) and (11), at this time If Harrison's start with speed control, the minimum auto-tensioning, ≥ 2 [(a full-EA) / (e a 1) + Wkj + mksin] (A 12) n the JL from (4), type ( 7) and (11), when the use of a Nordell's starting speed control, the minimum automatic tensioning force shall meet the ≥ 2 [(a EA) / (e-1) + + mf] (0 ≤ t ≤ 1 .) (13) F ≥ 2 [(a EA) / (e a 1) + + m74v × (1 a)] (Report ≤ f ≤ T) in this state, starting with Harrison's speed, automatic tensioning device with the tension of the control law (9) or equation (12) is greater; by Nordell's starting speed, the use of equation (10) or formula (13) is greater. References: [1] Wang Guangfeng. Analysis and monitoring of belt conveyor running [M]. Changchun: Jilin University Press, 2OO6. [2] Huade. AC Speed Control System [M]. Beijing: Electronic Industry Press, 2003. [3] Wang Guangfeng. Multi-pulley drive belt conveyor roller traction distribution of [J]. Mining machinery, 1991 (1). [4] Wang Guangfeng. Discrete multi-drive pulley drive belt conveyor power distribution analysis [J]. Mining machinery, 1990 (12). Author: Wang Guangfeng (1954 a), Heilongjiang Luobei people, Professor,[link widoczny dla zalogowanych], Northeastern University Ph.D.,[link widoczny dla zalogowanych], graduated in 1982 from Liaoning Technical University, Xuzhou Normal University is now engaged in mechatronics Electrical Engineering teaching and research, e-mail: wzn1985 @ Received :2008.04-30 thin seam efficiency working face equipment safety measures for management of Yanzhou Mining (Group) Company of Jining II coal seam longwall face 93Eo5 average thickness of 1.44m, with high-power electric Traction drum shearer with high-intensity double-stranded scraper conveyor applications, supporting self-moving hydraulic support and electro-hydraulic control system, automatic operation can face for safe and efficient thin seam mining created a favorable external conditions. In addition, production process equipment for the on-site security management weaknesses and has taken some effective measures. As the face of the mining height is relatively low, combined with dust and large, it is easy to make the workers have irritable mood. Therefore, in the hydraulic support with the first beam at the nozzle, together with coal mining itself is installed inside and outside the spray nozzle cut coal are normally open all the time; points are reproduced in all settings are automatic spray device, reducing the coal-dust; strictly enforce the \training, and invited manufacturers of theoretical knowledge and technical personnel to conduct training and mine-site operating practices such as skills training, until after passing the examination to allow induction operation. LI Jian-feed a 22 -
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