Now, CNS has compiled some violations of operating procedures for small cranes. After reading them, we hope that everyone will pay attention and avoid such violations from happening again.
Now, CNS has compiled some violations of operating procedures for small cranes. After reading them, we hope that everyone will pay attention and avoid such violations from happening again.
The hoist baskets used for loading and lifting objects at the lifting site were put into use without being inspected and accepted by technical personnel.
2. Before using small cranes, hand chain hoists and other equipment, they are not carefully inspected. Unqualified lifting tools are used. After the operation is completed, power is not cut off in accordance with the specifications, or the operation switch is not turned off, which causes stability hazards.
3. The staff operating the small crane were not concentrated and did not work seriously during the operation. Before starting the lifting operation, they did not give the lifting signal to the people below.
4. There are people walking under the crane's boom and within its working range.
5. Use pipes or beams and columns as the fixed points for small cranes.
6. When hoisting heavy objects, the binding is not done properly, the stability coefficient of the binding rope is insufficient, and the Angle between the ropes is greater than 60 degrees.
7. When the binding rope for heavy object hoisting comes into contact with angular objects, no anti-wear pads should be placed; when it comes into contact with smooth objects, no anti-wear pads should be placed.
8. The principle of "inspection - test lift - re-inspection - re-lift" was not followed before the heavy object was hoisted.
9. Operators operate cranes and other lifting equipment without relevant certificates.
10. If the lifting steel wire rope has excessive broken strands or broken wires, it has not been scrapped and is still in use.
11. Without using steel wire ropes or lifting ropes for cranes, ordinary ropes or steel wires are used to save costs.
12. Incorrect hoisting command signals or incorrect command by the commander.
13. After the crane malfunctions, without seeking technical personnel to troubleshoot or consult, it is modified privately.
14. The conditions around the hoisting area were not inspected before hoisting.
15. Small cranes used indoors are surrounded by water and the power strip is located at a low position, which can easily cause electric shock accidents.
16. Even when the weather is bad, such as overcast and rainy days with poor visibility, hoisting operations are still carried out outdoors operating small cranes.
17. Pull or twist the steel wire rope at an Angle to lift heavy objects.
18. An important point is to forget to press the counterweight. For outdoor hoists, it is generally necessary to press the counterweight.
19. Then comes the overloading lifting. Any lifting equipment and loading equipment must not be overloaded.
Accidents often occur during the operation of small cranes. In fact, a large proportion of accidents are caused by improper operation. With the continuous development of society, the stable operation of cranes has been receiving increasing attention from people. Before each small crane is put into operation, the no-load lifting, lowering, amplitude, rotation and other mechanisms should be tested to check for any abnormal phenomena. If there are any abnormal phenomena, the cause should be checked and the potential stability hazards eliminated before the small crane can be officially used.
The small crane is equipped with an opening and closing mechanism and a lifting mechanism. The grab is respectively hung on the opening and closing mechanism and the lifting mechanism through four steel wire ropes. The opening and closing mechanism drives the grab to close and pick up materials. When the bucket opening is closed, immediately start the lifting mechanism to evenly load the four steel wire ropes. When unloading, there is only an opening and closing mechanism, and then the bucket opening is opened to tilt the material. Except for the lifting mechanism, the structure of the grab crane is basically the same as that of the hook crane. The working mode of the hydraulic type is roughly the same as that of the mechanical type, but the difference lies in its opening and closing methods.
A regular technical inspection of the small crane should be conducted once a year. During the technical inspection, in addition to a detailed examination of all components of the crane, static and dynamic tests should also be carried out on the small crane. When a small crane is lifting goods and rotating, the crane must not be moved. Operators of small cranes must be familiar with the stable operation procedures of small cranes, have received training, and possess good eyesight and hearing before they can operate them. Flammable materials (kerosene, gasoline and other flammable items) are strictly prohibited from being placed on the small crane.
When a small crane rotates to lift goods, the height to which the heavy object is lifted needs to be more than 0.3 meters above the obstacles. When adjusting the amplitude of the boom and turning the handwheel, it must be in a no-load state and no heavy objects should be lifted. Operators of small cranes should be aware that the lifted load must not exceed the rated lifting capacity of the boom, and the lifted object should be in the naturally drooping position of the hook.
