Sometimes when we are using it, we may find that the truck-mounted crane only goes up but not down. Why is that?
Sometimes when we are using it, we may find that the truck-mounted crane only goes up but not down. Why is that?
When the truck-mounted crane only goes up but not down, we should first check whether the hoisting part of the truck-mounted crane has malfunctioned, whether the rope is stuck on the shaft, whether the motor has malfunctioned, and whether the circuit connection is unstable. All these factors can cause the truck-mounted crane to only go up but not down. When we reach the maximum stroke of the truck-mounted crane during operation, that is, when all the ropes are released, we can no longer continue the descent. The pulley at the top of the boom may also cause such a situation in the truck-mounted crane. When the pulley gets stuck or wears out, it may result in the rope being unable to descend.
Nowadays, when people talk about rollover accidents, they mostly refer to the overturning of vehicles during operation. As a type of loading and unloading lifting tool, household small cranes are also prone to rollover accidents during operation if not operated carefully.
By following these points, you can prevent the household small crane from overturning accidents:
1. The counterweight ratio reaches balance. After the small crane is installed, it cannot lift heavy objects immediately. First, place heavy objects such as cement and bricks on the base of the truck-mounted crane as counterweight materials. During the lifting process, the weight of the heavy object suspended by the hook must not exceed the weight of the counterweight material; otherwise, it is easy to cause a overturning accident.
2. The lifting speed should be slow. Small cranes are different from large lifting tools such as electric hoists and cranes. If the lifting speed is too fast, the heavy object will swing back and forth and rotate too much, which will also cause the center of gravity of the crane to be unstable and lead to overturning accidents.
Therefore, when using a household small crane to lift heavy objects, we should follow the operation norms to lift the heavy objects to avoid overturning accidents.
A crane is a kind of mechanical equipment for lifting and transporting goods. The name "crane" is a unified title for lifting equipment. Generally speaking, the key points of calling a crane are still cranes, crawler cranes and rubber-tired cranes. Nowadays, the application of cranes is becoming more and more widespread. So, do you know what common problems need to be encountered during the lifting and hoisting process of cranes? Now, CNS will give everyone a brief introduction.
Before the crane starts working, the standard of supporting the feet first and then the boom should be followed. When delivering the vehicle, the standard of retracting the arms first and then the legs should be followed. The actual operation of lifting and hoisting should follow the stability standards. The driver should fully consider the impact of factors such as lever effect, inertial force and air resistance on the characteristics of lifting and hoisting. When the boom is extended or retracted, the elevation Angle of the lifting boom should be no less than 70°. During the entire process of lifting and hoisting, it is strictly prohibited to extend or retract the arm while carrying the lifted object.
2. Throughout the entire construction process, it is necessary to do a good job in on-site cleaning, remove obstacles, and facilitate operation. During the entire process of engineering construction, if it is necessary to use the binding and lifting slings of structures, they must be inspected, be able to stably bear the load and be approved before use. In addition, the thickness of the protective layer should be increased to ensure that the structure and slings are not easily damaged.
3. Due to the impact, swing and exceeding the work area during lifting, it is necessary to select stable parts based on the conditions of the work area to correctly prevent lifting injuries. When the lifting and hoisting work is completed and the vehicle is handed over, first, the lifting arm should be steadily retracted and placed on the arm's fixed bracket. Then, the lifting and hoisting feet should be retrieved and the retarder separated. Only then can the mechanical equipment be moved.
4. Throughout the entire application process, it is necessary to avoid overloading operation at temperatures that do not exceed the required level, and to ensure the normal operation of the preheating stage. Only when the mechanical equipment reaches the required temperature should it be operated or put into work. To prevent mechanical equipment from operating at high temperatures, the readings on various thermometers should be frequently checked throughout the operation process of the equipment. If any problems are found, the machine should be shut down immediately for inspection. Any faults found should be cleared immediately.
