With the increase of the use frequency of the crane, all kinds of accidents is rising, the most common accident was overturned and folding boom. The main cause is overturned accident crane lose stability. The cause of the loss of stability is hanging heavy overload, supporting uneven, the inertial force, the centrifugal force, wind, etc. Folding boom accident is of hoist boom elevation is too large, plus the role of the inertial force to hoist boom caused by it. To reduce similar accidents, must be standardized, truck crane operation behaviors, and ensure the safety and correct.
Before using cranes, want to check the safety device. The main safety device has magnitude indicator, lifting height limit device, pressure gauge, etc. Amplitude indicator can reflect the pointer various working conditions the arm to the elevation value, according to the extent the reference "the lifting capacity table" and "lifting characteristic curve" to decide to allow a weight, so as not to overload. Lifting height limit is applied to prevent hook overwind, when hook over rolling hook stop automatically when the action. The hydraulic system of the oil pressure of work through the pressure gauge shows, in the security device ready, each system normal operation idling can implement operation. Lifting operation, the ground should be smooth solid, and the legs must be in full stretch state, and should be adjusted to the state level crane. The longest arm work, wind must not be more than 5.
Crane ban homework ahead, namely hook in lifting operation when focus shall not exceed the rotary center and a leg before (or so) grounding attachment in the center. The device has instructions in weight can not use the fault, should be determined according to the lifting capacity table lifting weight, sling weight shall be in total up within the weight. Hanging heavy homework, hoist boom is strictly prohibited under stand, it banned buried in the ground or raking shores heavy weight avoid side load; Before operation to carefully check, prohibited the use of substandard wire rope and lifting chain; It is not allowed during heavy falls arm; Must fall arm a put down should rise again homework; Fall when the throttle to small arms, carry arms to throttle when; Turn to smooth, not suddenly stopped; When hanging heavy rated up close to weight, not in lifting off the ground, and 0.5 m above the air turned; Crane hoisting in heavy, should try to avoid heavy crane luffing; Hoist boom elevation shall not lifted a heavy suddenly put down, prevent sloping; No hanging heavy traffic.
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