FAQ >> Tower Crane Safety Devices

Tower Crane Safety Devices

Tower crane safety devices comprise: load moment limiter, turntable lock pin, boom backstop, hoist limit switch, anemometer, level gauge, hydraulic overflow valve, counterbalance valve, two-way hydraulic lock, stewing warning lamp and travel warning lamp, etc.

Load Moment Limiter

Detection function: automatically detect boom angle and lifting load. Display function: real time display current actual load, working radius and boom angle. Warning function: automatically send out warning and stop crane operation when detecting actual load exceed rated load, boom out of limit angle.

Detection function: automatically detect boom angle and lifting load. Display function: real time display current actual load, working radius and boom angle. Warning function: automatically send out warning and stop crane operation when detecting actual load exceed rated load, boom out of limit angle.

Main/Auxiliary Winch Over-Wound Protection Device

When main/auxiliary winch hoists up to a certain lifting height, an over- wound warning lamp on instrument panel lights on, at the same time, load moment limiter stops crane operation.

Main/Auxiliary Winch Over-Release Protection Device

When access switch in winch drum detects only three turns of wire rope left on the drum, an over-release warning lamp on instrument panel lights on, at the same time, load moment limiter stops crane operation.

Winch Ratchet Locking Device

Winch drum has a ratchet locking device, and it must be turned on when lowering boom, otherwise boom cannot be lowered. The device is used to stow the boom for safety.

Boom Angle Limit

When boom angle is more than 800, load moment limiter and hoist limit switch stop boom raising. When boom angle is less than 300, hoist limit switch stops boom lowering.

Audio/Video Warning

When crawler crane is moving and slewing, there is light and sound for warning.

Tricolor Warning Lamp

The lamp comprises 3 colors, when crane loading is below 90% of total rated lifting load, "Green Lamp" lights on to indicate crane is running in safety area; when crane loading is in 90%-100% of total rated lifting load, "Yellow Lamp" lights on to indicate crane is dose to total rated lifting load; when crane loading is above 100%^-105% of total rated lifting load, "Red Lamp" and "Yellow Lamp" light on at the same time to indicate crane is overload; In dangerous area, control system can automatically cut off crane movement to dangerous direction.

Illumination Lamp

There are illumination lamps at front of turntable, on boom and inside operators cabin for night operation.

Height Mark Lamp

Boom Up has a height mark lamp for high level operation warning.

Anemometer

Anemometer at boom head can detect current wind speed and send wind signal to a monitor in operator's cabin to alert operator for safety.

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