It is very important to choose the correct and suitable hoisting location for automobile hoisting, and there are also certain stresses and norms. When choosing the hoisting location, it should be noted that: 1, the ground is solid and will not sink; 2. The lifting radius of the crane should cover the whole working range as much as possible; 3. There are no wires and other things that may cause safety hazards to the project within the hoisting scope; 4. The light should be bright and the field of vision should be broad.
Second, the basic operation method of truck crane to open the power take-off.
After selecting the lifting position, the crane should be ready for lifting. The operation method is to hang the corresponding car gear and open the power take-off. The lifting gear of Zhonglian QY25V is the 4th gear. The lifting gear of different models and brands of truck cranes here is different, depending on the specific situation. Then turn on the power take-off button, and the leg can be carried out.
Three, the basic operation method of truck crane leg
Zhonglian QY25V-* * has five legs, the body has four legs, which are H-shaped, and there is a front leg, which increases the stability of the crane in the forward direction.
Generally, the sequence of legs is to support the four legs of the car body first, and then support the front legs. The four legs of the car body can be supported together, or the two sides can be split in two, and the speed of supporting the four legs at the same time is slow. The operation method of Zhonglian QY25V outrigger is as follows: firstly, push two or four outrigger joysticks to the upper gear, then the telescopic joysticks break to the lower gear and the outriggers extend horizontally; When the horizontal hydraulic cylinder extends, push the telescopic joystick back to neutral (middle gear), push two or four outrigger joysticks to the lower gear, and then push the telescopic joystick to the lower gear, so that the vertical hydraulic cylinder of the outrigger extends downward. The operation method of front leg extension is the same. (the operation method of retracting legs is the opposite. )
There is also an important component in the leg system, called the level meter, through which you can clearly see whether the leg is horizontal or not. Through the above operation, each leg can be adjusted independently until it is horizontal.
In addition, when the truck crane is on the leg, it is necessary to pad the leg, which can increase the stress area and improve the stability.
Four, the basic operation method of truck crane rotation
After the outrigger is completed, the lifting, slewing, luffing and boom expansion of the truck crane are all carried out in the operation room. The rotary operation of Zhonglian QY25V is completed by the rotary joystick in the operation room. The operation method is to rotate the rotary joystick counterclockwise when it is pushed to the low position, and clockwise when it is pushed to the high position.
Five, the basic operation method of truck crane boom expansion
When Zoomlion QY25V's boom telescopic joystick is pushed to the high position, the boom stretches, and when it is pushed to the low position, the boom contracts. The boom of Zhonglian QY25V has four arms, which extend and contract synchronously. The boom of a truck crane usually has 4-5 arms, and in many cases there are 7 arms. Telescopic boom has many forms, including synchronous telescopic, independent telescopic and combined telescopic. Different brands, different models and different operation methods.