25 tons of car cranes are the mainstream of car cranes. From the sales volume of 2011, the sales of 20-30 tons of truck crane are 21914, accounting for 61.8% of the sales of car cranes. Car cranes, especially about 25 tons of car cranes, are not only in the engineering machinery industry, but also play a more and more important role in all walks of life in the social life. At the same time, we also see the huge market of truck cranes.
Recently, the editor of the armour has been fortunate to have visited a machine hand with years of experience in cranes, hoping to take this opportunity to provide a chance to communicate and learn from the cranes and the new people who want to go to the crane industry.
This visit's sun master, 91 years old, does not see him only 21 years old. He has had more than 4 years of experience in the operation of car cranes from 08 years, and has been the master of the two apprenticeship. Master Sun master's operation of ZOOMLION QY25V, can be said to be the classic model of the Zhonglian crane, is the most user of the Zhonglian truck crane, so the operation method will have a certain representation.
Basic operation method of automobile crane
1. Selection of lifting points for basic operation methods of truck cranes
It is very important to choose a proper and proper lifting place for vehicle lifting. Select the place to pay attention to: 1, the ground is strong, will not sink; 2, crane crane radius as far as possible coverage of the whole range of work; 3, no wire in the lifting range will cause safety hazards to the project; 4, bright light, wide field of vision.
Two. The opening and taking force device of the basic operation method of truck crane.
After choosing the lifting place, the crane should be set to be ready for lifting. The operation method is to hang up the corresponding automobile gear and open the force collector. Zhonglian QY25V lifting gear is 4, here different models and brands of truck crane lifting gear are different, depending on the specific circumstances. Then the button of the power take-off can be opened, and then the outrigger can be carried out.
Three. The leg of the basic operation method of the truck crane
There are five legs in the QY25V, four legs in the body, H-shaped, and one front leg, increasing the stability of the crane in front of the car.
The order of outrigger is usually the first four legs of the body, then the front leg. The four legs of the body can be supported together, or the two separate branches on both sides. The four legs must be supported at a slower speed. The operation method of the QY25V leg of Zhonglian is to push the two or four support lever of the body to the upper gear first, and then the telescopic joystick is broken to the lower gear level and the leg is stretched horizontally; when the horizontal hydraulic cylinder is stretched out, the telescopic joystick is pushed back to the space (middle gear) and the two or four leg manipulating rods are pushed to the lower gear position. Then push the telescopic joystick to the lower gear and extend the vertical hydraulic cylinder of the outrigger. The operation of the anterior leg extension is the same. (the way to handle the leg is the opposite)
There is also an important component in the outrigger system, called the level gauge, through which it can clearly see whether the leg is horizontal. The outrigger can be adjusted individually until the level is up.
In addition, truck crane in the leg support need to be in the leg position cushion, can increase the force area, improve stability.
Four. The rotation of the basic operation method of the truck crane
After the completion of the outrigger, the lifting, turning, amplitude and boom expansion of the truck crane are carried out in the operating room of the vehicle. The rotary operation of Zhonglian QY25V is accomplished through the rotary control lever of the operating room. The operation method is that when the rotary joystick is pushed to the lower gear position, it rotates counterclockwise, whereas when pushed to the upper gear position, it rotates clockwise.
Five. Telescopic boom for basic operation of truck crane
When the telescopic joystick of China United QY25V is pushed to the upper gear position, the boom is stretched and pushed to the lower gear position, and the boom is contracted. The suspension arm of China United QY25V has four arms, which is synchronous and telescopic. The boom of a truck crane is usually 4-5 arms, and there are seven arms at most. There are various forms of telescopic boom, synchronous telescopic, independent expansion, and combination expansion, different brands and models can be different, and the operation mode is different.
Six, variable amplitude of basic operation method of truck crane
When the variable amplitude lever of QY25V is pushed to the lower gear, the variable amplitude hydraulic cylinder stretches and the amplitude increases; when the upper gear is pushed to the upper gear, the variable amplitude hydraulic cylinder is contracted and the amplitude is smaller. The display screen in the operating room can clearly see the angle of the amplitude change, and there are also signs on the right side of the boom to show the angle of the amplitude change, but not so accurate.
Seven. Lifting and landing of basic operation methods for truck cranes
The other two joysticks in the QY25V operating room are one to control the landing of the main arm hook and the other to control the landing of the telescopic arm or the auxiliary arm hook. They operate in the same way. When the lever is pushed to the lower gear, the hook lifts, and when pushed to the upper gear, the hook drops.
Eight. The auxiliary arm of the basic operation method of the truck crane
The secondary arm of QY25V is a single-section truss type, eight meters long, and can be lapped when the cantilever cantilever can not meet the needs of height. The overlapping of the QY25V auxiliary arm in the middle link needs to be done manually. The wire rope of the pulley at the top of the terminal arm is connected to the pulley at the end of the auxiliary arm. After joining the arm, the length and height of the lifting are increased, but the weight is greatly reduced. The weight of the auxiliary arm is only about 1 tons after the QY25V connection is connected to the auxiliary arm.
Nine. Mandatory stopping of basic operation methods for truck cranes.
In the QY25V operating room, there is a forced stop button. When there is a sudden situation in the work, press this button, the crane will stop all work, and can avoid serious consequences caused by the lifting accident.
The above is the example of Zhonglian QY25V, which introduces the contents of the operation method of truck cranes. The operating room of a truck crane can have different designs and techniques, such as automatic handle technology, but the methods of operation are basically the same, and the contents of the operation are basically the same. I hope this is helpful for crane operators and people interested in cranes.
