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5 major safety devices for tower cranes

by:Powerston     2021-04-13
Tower cranes must be equipped with lifting weight limiter, moment limiter, height limiter, stroke limiter, amplitude limiter, etc. (1) Lifting weight 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 of the lifting mechanism to stop or send alarm. There are two types of lifting limiters, mechanical and electronic. Crane company, technology for you! Tower construction hoists must be equipped with lifting weight limiter, moment limiter, height limiter, stroke limiter, amplitude limiter, etc. (1) Lifting weight 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 of the lifting mechanism to stop or send alarm. There are two types of lifting limiters, mechanical and electronic. (2) Moment limiter: For luffing cranes, only a certain range is allowed to lift a certain lifting weight. If it is overweight, there is a danger of tipping over when lifting the weight. 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 is cut off, making the lifting impossible and ensuring the stability of the crane. There are three types of torque limiters: mechanical, electronic and compound. (3) Height limiter: also known as the hook height limiter. Generally, it is installed on the head of the boom. When the hook slides to the limit position, the lever is lifted. Press down the limit switch, cut off the circuit to stop, and then close the hook, the hook can only be lowered. (4) Stroke limiter: a safety device that prevents the crane from crashing or restricting travel within a certain range. It is generally installed on the inner side of the active trolley, and is mainly installed with a travel switch that can toggle the lever. In addition, a fixed limit position baffle is installed at the end of the track (at a limited position of operation). When the tower crane moves to this position, the limit baffle touches the lever of the travel switch, cuts off the power supply for controlling the walking, and recloses it. The tower crane can only run in the opposite direction when the gate is locked. (5) Amplitude limiter: It is also called the amplitude limiter or the amplitude indicator. An amplitude indicator is hung on the boom of a general boom crane. It consists of a fixed circular indicating plate, and a vertical movable pointer is installed in the center of the plate. When the amplitude is changed, the pointer indicates the rated lifting capacity under various amplitudes. When the boom moves to the upper and lower limit positions, respectively press the limit switch, cut off the main control circuit, and stop the luffing motor to reach the limit position. specializes in providing all kinds of construction hoists, welcome to inquire!
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