As an important lifting equipment in industrial production, metallurgical technology and mechanical equipment, the safety and reliability of the crane is also high. For the sake of safety, safety switch will be set on the crane cart, while trolley, main hook are set with safety limit switch and electromagnetic lock system, these measures effectively protect the safe operation of the crane.
The limit switch of the crane includes beam, trolley, main hook and other limit switches, among which the direct motion travel switch is connected or disconnected by moving objects colliding with movable parts to realize the unimpeded circuit. In the process of work, the crane is not always in the starting state, belongs to intermittent machine, non-stop start or stop, so in the lifting mechanism of the crane, operating mechanism, rotating mechanism are equipped with a specific braking device, so as to prevent the crane from safety accidents.
The programmable controller in the crane is the control core of the crane, in charge of the main command controller, limiter, switch buttons and other open and disconnect. Considering that the car bump rule touches the limit switch to make the motor power off and brake, the car has to go a section of braking stroke, so the trolley limit switch position to install appropriate. The driving device of the trolley is driven, braking, transmission combined with the three effects of the driving device, its advantages are compact structure, its weight is relatively light, the device is light and convenient, running is also relatively stable and reliable, the only disadvantage is that this kind of mechanism is more time-consuming and laborious, maintenance is a little difficult.
