Wearable computer and wireless network technology

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Wearable computer and wireless network analysis of technical points

Fruit. * Save the rotary tower crane motor power accounts for about 30% of the original power for the huge number of tower crane use, it will be a substantial figure. 3. Instance in 2004 in a construction machinery plant purchased from a QTZ5013 tower crane. The tower crane manual states: slewing tower crane rotation difficult. The tower rotation speed of 0.6 rev / min, the configuration of the motor YZR132M2-6-135, power is 3.7KW. In order to improve the performance of its rotation, the tower crane arm balancing on the railings on both sides of an increase of 6m2 wind boards, net weight and balance, lifting the windward area of overlapping institutions. The actual increase in the wind area of about 5m2, The point of the wind-board wind tower axis of rotation to the horizontal distance of 10 meters. Balance the increased wind resistance torque arm: M = Cw · Pw · A · L = I. 2x150x5x10 = 9000Nm torque equivalent to a corresponding reduction in wind resistance of some M = 0.7 · M = 6300Nm tower QTZ5013 Plate after the wind increased the turning resistance moment load conditions the state suspended 50 meters 12 meters hanging 1,3 tons to 6 tons of friction resistance to resistance torque 110017662258MpNM ramp torque 15887O458950MFNM equivalent wind resistance torque 415,905,876,057,810 (former) MwlNM equivalent wind resistance torque 35290524605l510 (after) Mw2NM equivalent before and after the drag torque than Mw2, Mwl% 858989 also can be seen from the table , much larger than the equivalent wind resistance torque and the equivalent friction torque resistance torque and the ramp to meet the formula: Mw> k (M # Ms), (k 3-5, consider turning part of the inertia torque , turn inefficient, slewing devices such as poor lubrication and wear.) thus increasing the wind boards does not affect the working condition wind speed 20m / s of the tower crane free to rotate. But the increase of the work of state tower wind load, structural strength required to check on the tower. 4. Selection of rotary bodies rotating inertia braking torque depends on the length of time, the braking time is generally not less than 4 seconds,[link widoczny dla zalogowanych], too long of tower crane production efficiency, time is too short to have a great moment of inertia , especially when playing against car drivers against the rule. More likely to cause damage to rotating parts, so slewing tower crane must be flexible connection, slow startup mode. Common connection types are: 1), micro electromagnetic coupling centralized control + 'Festival + belt drive features: Kai, smooth braking. However, a higher cost. Electronic control block maintenance difficult. 2), motor series resistance starting + + flexible coupling hydraulic coupling features: simple structure, easy installation and maintenance, but the impact of large inertia, starting and braking when the tower with a large deformation, fluid coupling damaged. 3), variable frequency motor control features: realization of CVT, but the frequency conversion motor high cost and high failure rate. High maintenance costs. The use of a variety of tower crane from the point of view, priority should be given the centralized control of Microelectronics, electromagnetic coupling and belt drive this form of connection. Increase in the circuit design can be inserted backup control block. Reduce the failure rate. In addition. Should be reasonable rotation of the pinion design process, to avoid back and shoulder blade slot, to prevent stress concentration and enhance gear fatigue resistance spindle, which is the life of the gear shaft has very important significance. l