How to use truck crane safely

How to use truck crane safely

the stability of the crane depends on the erection levelness and amplitude of the crane. The use of outriggers, lifting direction and operation are related to many factors. If you do not pay attention, overturning accidents will occur

the four outriggers of the crane are the key to ensure the stability of the crane. During operation, horizontal bubbles should be used to level the slewing surface of the support. If the ground is soft and uneven or when working on a slope, wood or iron plate must be placed under the outrigger pad. It can also be divided into: routine fatigue test and fatigue crack expansion test. Advanced textile materials can be used to prepare iron plates with finalized specifications under the outrigger pad, Adjust the outrigger position. In order to prevent the hydraulic system from failure and accident, safety sleepers shall be placed under the leveled outriggers to ensure safe operation

the stability of the crane varies with the lifting direction. Lifting capacity is also different; The rated load can be lifted in the direction with good stability. If it is turned to the direction with poor stability, it will be overloaded and may overturn. There are special provisions for the lifting capacity of some cranes in different lifting directions. However, in general, most truck cranes are not allowed to be hoisted in the operation area in front of the truck. Therefore, when using the truck crane, it is necessary to carefully follow the provisions of the locomotive instructions

since the boom of the crane is mostly a rectangular box structure, its lateral stability is very poor after being stressed, so it is strictly prohibited to pull the boom sideways during operation to prevent the boom from being stressed sideways. Therefore, it is not safe to use sliding lifting when lifting the column, because the sliding resistance of the column foot will deform the boom under lateral stress, which is unsafe. In order to ensure the safe operation of the crane, a crane is usually added at the root of the column to reduce the resistance between the column foot and the ground when lifting the heavy column

when the truck crane uses a longer boom to lift components, the boom should refer to the standard · linear grating ruler or resistance strain gauge in detail: the forward natural deflection to a certain extent during the 3-point zigzag test. When the load state is determined, the longitudinal deflection of the boom will be considered. When the boom rotates, centrifugal force will be generated to prevent overload. Do not rotate too fast. The load will tend to fly out, which will increase the amplitude, reduce the lifting capacity, and have low stability. The risk of overturning will be great. Wear resistant electrode

when lifting heavy objects, the crane usually drops freely only for the empty hook falling of the lifting hook. For example, when it is used for lifting heavy objects, its weight should be less than 1/3 ~ 1/5 of the rated load. When the load drops rapidly, the impact force will increase under the action of gravity acceleration, which will have a great impact on the outrigger and girder. If the crane stops suddenly in the middle, the crane will lose stability under the action of gravity acceleration, which will cause the boom to break, so it is necessary to strictly control the free descent. Therefore, the safe operation of the locomotive can be ensured by using the power to descend when the lifting weight falls

the safety devices of truck crane include moment limiter and over winch device, and their functions and functions have been described above. It is also equipped with horizontal bubbles to check the inclination of the crane. It is a measuring instrument to ensure the levelness of the vehicle body, and can prevent the crane from tipping after the horizontal inclination exceeds the limit. After the outriggers of the crane are fully extended in the instant, the fuselage shall be horizontal