Crane hoisting mechanism mainly run institutions, luffing mechanism, slewing mechanism and metal structure. Hoisting mechanism is the basic working body of the crane, mostly by hanging system and winch composition, but also lift weights through the hydraulic system. Operation mechanism for horizontal transport of heavy or longitudinal adjustment of the position of the crane's work generally consists of motor, reducer, brake and wheel components. Luffing mechanism is equipped with only the jib crane, when the jib looked amplitude decreases, the amplitude increases when bent, sub balanced and unbalanced luffing luffing two. Boom slewing mechanism for causing rotation is determined by the drive means and the rotary bearing device. Metal structure is the skeleton of a crane, the main carrier such as bridge, boom and mast can be box-shaped structure or truss structure, but also for the web structure, and some can be used as a steel support beam.
First, during the operation of the crane machine among these three operation means are inextricably linked, acquire a driving device for instance, in a special track laying, mount a drive unit, crane machine running them, to a major source of power from the car, prompting play a significant move in orbit above the car, and the size of the car and the aid of a crane supporting role in supporting the weight of the device itself and the external load of the slow transfer are elsewhere, but in this process, the safety device has been In the execution of its duties, the security staff of the crane and plays fundamental role in safeguarding.
Simple terms, crane machine drives can be divided into self-drive and traction drive system, where the main Laijiangjiang Crane traction drives. Crane support means relatively speaking, there is no more complex structure and working principle, is single.
The type of work and safety performance of the crane has a very close relationship. Lifting capacity, span, crane lift height the same, if a different type of work, in the design and manufacture, the safety factor is not taken the same, that is, parts type, size, specifications vary. Such as wire rope, brake as a result of different types, different safety factors (light-level security coefficient is small, heavy duty safety factor), the selected model is not the same. Then as a 10t overhead crane, for intermediate type of work (JC = 25%) of the lifting motor power N = 16KW, and for heavy duty type (JC = 40%) Lifting motor power was N = 23.5 KW.
From the above we can see that the type of work if the light level of the crane used in heavy duty type of place, a crane will often fail, affecting safety in production. Therefore, security checks, pay attention to the type of work the crane must be consistent with the working conditions. Frequency control system through heavy fall when the motor brake energy regeneration, was taken by the inverter DC circuit access braking resistor consumed way, the movement of the large car and hook quickly and accurately speed drops to zero.