L68B2 Mast Section show you all kinds of tower crane electrical equipment
1. The height limiter, also known as the hook height limiter, is generally installed at the head of the boom. When the hook slips to the limit position, it will lift the lever, press the lower limit switch, cut off the circuit and stop, and then close, the hook can only drop.
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2. The lifting limiter, also known as overload limiter, is a kind of safety device that can make the crane operate without overload. When the lifting load exceeds the rated lifting load, it can automatically cut off the power supply of the lifting mechanism to stop or give an alarm.
3. For the luffing crane, the moment limiter is only allowed to lift a certain amount of lifting weight in a certain range. If it is overweight, it is dangerous for the crane to tip over. Moment limiter is a kind of protection device developed according to this feature. In a certain range, if the lifting object exceeds its corresponding weight, the circuit will be cut off, so that the lifting can not be carried out and the stability of the crane will be guaranteed.
4. Travel limiter, a safety device to prevent the crane from colliding or driving within a certain range. It is generally installed in the inner side of the driving trolley, mainly to install a stroke switch that can move the handle. In addition, a fixed limit position baffle shall be installed at the end of the track (at the position limited by the operation). When the tower crane moves to this position, the limit baffle will touch the handle of the travel switch, cut off the power supply for controlling the travel, and then the tower crane can only move in the opposite direction when it is closed.
5. Amplitude limiter, also known as luffing limit or amplitude indicator, is generally hung on the boom of boom crane. It is composed of a fixed circular indicator disk, and a plumb movable pointer is arranged in the center of the disk. When luffing, the pointer indicates the rated lifting capacity under various amplitudes. When the boom moves to the upper and lower limit positions, press the lower limit switch respectively, cut off the main control circuit, and the luffing motor stops to reach the limit.
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6. Limit moment coupling to prevent the tower crane from rotating overload.
7. Anemometer: the anemometer must be installed on the top of the crane whose boom root hinge height is more than 50m.
8. Rail clamp and travel limit device shall be installed for the rail tower crane, and travel limit device shall be installed at the same time.
9. Lightning protection and anti electromagnetic induction device. For the crane with the height of the hinge point at the root of the boom more than 50m, lightning protection device shall be installed and anti electromagnetic induction measures shall be taken according to the actual situation.
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