Limit limiter is generally divided into two categories:
One is a lifting limiter and a lowering limiter to protect the safe operation of the lifting mechanism;
The second is the limit position limiter that limits the running mechanism of bridge crane. When the luffing mechanism, hoisting mechanism and running mechanism of the crane reach the set position during the lifting operation, the limit position limiter shall send out an alarm signal in time and automatically cut off the power source running in the dangerous direction.
During the lifting operation, the working reliability of the limit position limiter should be maintained, and it should be checked and maintained frequently. If a fault is found, it should be repaired in time.
Extended data:
The tower crane must have lifting capacity limiter, moment limiter, height limiter, travel limiter, amplitude limiter, etc.
(1) Lifting capacity limiter: also known as overload limiter, it is a safety device that can prevent the crane from overloading. When the lifting weight exceeds the rated lifting weight, it can automatically cut off the power supply of the lifting mechanism to stop or give an alarm. There are two kinds of lifting limiters: mechanical and electronic.
(2) Torque limiter: For luffing crane, only a certain lifting weight is allowed within a certain range. If it is overweight, the crane is in danger of tipping over. Torque limiter is a kind of protection device developed according to this characteristic. In a certain range, if the hoisted object exceeds its corresponding weight, the circuit will be cut off, which will make the lifting impossible and ensure the stability of the crane. There are three types of torque limiter: mechanical, electronic and composite.
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