290HC Mast Section What does the tower crane limit device have, what effect does it have
Tower Crane Limit Device has weight limiter, moment limiter, height limiter, travel limiter, amplitude limiter, etc. Below each kind of tower crane limit device to do the following detailed introduction. 1. The weight limiter, also known as the overload limiter, is a safety device which can prevent the crane from overload operation. When the load exceeds the rated weight, it can automatically cut off the power supply of the lifting mechanism and stop the crane or give an alarm The lifting limiter has the mechanical type and the electronic type two kinds. 2. The moment limiter only allows to lift a certain amount of load for a certain amplitude of luffing crane, and there is a risk of overturning if the crane is over-weight. The torque limiter is a kind of protection device developed according to this characteristic. At a certain range, if the lifting object exceeds its corresponding weight circuit will be cut off, so that the lifting can not be carried out to ensure the stability of the crane. There are three kinds of Torque limiter: mechanical, electronic and compound. Height limiter also known as Hook Height limiter, generally installed in the head of the boom when the hook slipped to the limit position to lift the lever. The lower limit switch cuts off the circuit and the hook can only be lowered when stopping and re-closing.
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Travel limiter a safety device that prevents a crane from colliding or driving within a certain range. It is generally installed in the driving trolley inside, mainly installed a can pull the lever stroke switch. In addition, a fixed limit position baffle is installed at the end of the track at the limit position of operation. When the tower crane moves to this position, the limit baffle is the trigger of the stroke switch that cuts off the power supply that controls the operation The tower crane can only run in the opposite direction when reclosing. Amplitude limiter is also called amplitude limiter or amplitude indicator, and there is one on the Jib of the jib crane. It consists of a fixed circular dial with a vertical moving pointer in the center. The pointer indicates the rated lifting capacity at various ranges when the range is varied. When the arm pole moves to the upper and lower limit positions, the lower limit switch is pressed respectively, and the main control circuit is cut off.
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