电梯平衡系数（Elevator balance coefficient）.doc

电梯平衡系数（Elevator balance coefficient） At present, the inspection and testing institutions of special equipment in various parts of the elevator for acceptance inspection, the most time-consuming, but also the most cost, manpower, material resources, it is to detect the elevator balance coefficient. According to the inspection requirements: must be in the car carrying 0, 25%, respectively 40%, 50%, 75%, 100%, 110% rated load, measure the load current curve of the elevator, take the load coefficient of intersection point of upward and downward curve, is the balance coefficient of the ladder, the intersection in the range of 40% ~50% for qualified. In order to determine the parameters, in addition to the two inspection personnel, need more than the handling of weights of workers. As there are too many factors affecting the test, are the results credible? Even if the test results are within the range of 40%~50%, will they be qualified? If beyond this range, why not qualified? What is the meaning of the balance coefficient? Whats the effect on the elevator? Somehow, the determination of the balance coefficient is meaningless. 1, the essence of the balance coefficient In order to discuss the essence of the balance coefficient, we must start with the principle of the traction elevator. A vertical lift is a lifting device for vertical and downward movements of heavy objects. From the angle of mechanics, to make a heavy stay still in the air, there must be a force of T and the weight of the object Q phase equilibrium, i.e. T = Q, when the body is at rest or in uniform motion state, known as the balance. The system is called a balanced system. If the object moves upward, the speed change, the tension T in addition to overcome the gravity of the object is Q, but also provide a cause acceleration force F, T = Q + F = Q + m a (m for the quality of the object; a for acceleration). If the weight of the object Q is balanced by another balance W, W = Q, which constitute a balance sys