For special vehicles, when many people purchase them, they generally pay more attention to the engine and gearbox on the chassis. For atruck-mounted crane, these are indeed important, but the details are also crucial. It is said that details determine success or failure, and this statement is very reasonable. How to choose the detailed configurations of a truck-mounted crane?
1、Single pump or double pump? At present, the oil pumps used in domestic truck-mounted cranes are mainly single pumps and double pumps. The structure of the single pump is very simple, with only one pump body. It is mainly applied on smaller tonnage cranes. When combined with a high-quality truck-mounted crane chassis, a very good usage effect can be obtained. The double pump has two pump bodies installed together, equivalent to two single pumps. Therefore, the double pump has a larger oil supply, better stability, longer working hours, and a faster operating speed of the crane.
2、Hydraulic circuits Different truck-mounted crane hoists have different circuit designs. The single-circuit design is generally reflected in small tonnage cranes. This system has only one hydraulic circuit. Such cranes can generally only perform one action at a time. Although it is theoretically possible to achieve the linkage of multiple mechanisms by precisely controlling the throttle, it is bound to cause energy loss, increased heat generation, and low efficiency. Coupled with the fact that small tonnage cranes mentioned earlier all use single pumps with small flow rates, the actions will be very slow. Double circuits and multiple circuits can greatly improve work efficiency, but of course, they are relatively more expensive in price.
3、Boom extension methods of telescopic boom cranes As the largest assembly on a telescopic boom crane, when the boom performs the telescopic action, there are generally two methods. One is similar to some truck cranes, where there is a large cylinder inside the boom and the rest is driven by steel wire ropes, and all boom sections extend and retract simultaneously. The other one has two thin cylinders in the boom. First, the second boom is extended, which is the thickest section. After it is fully extended, the other boom sections extend simultaneously. The former has strong telescopic force with load, while the second boom has a slower telescopic speed, but it is psychologically more reassuring for short-distance use.
4、Boom cross-sections With the increased application of high-strength plates in recent years and the increased demand for lightweight, lighter and higher-strength hexagonal, octagonal and other shaped booms have begun to emerge.
5、Styles and types of outriggers The outriggers of crane hoists are mainly upright. This type of outrigger has a simple structure and can meet the usage requirements. Most of the current truck-mounted cranes adopt this type of outrigger. The other type is the reversible outrigger, which is suitable for some chassis with relatively tight space on both sides, such as towing truck-mounted cranes. There are two styles of rear outriggers, fixed and movable. The fixed type is mostly used for small tonnage chassis, and the movable type is mostly used for large tonnage chassis. For the middle outriggers that can extend laterally and the movable outriggers, there are single-chamber and double-chamber types according to different structures. The left and right outriggers of the single-chamber outrigger share one fixed outrigger chamber, while the double-chamber ones are independent of each other. Popularly speaking, the double-chamber outrigger is two sets of outriggers installed overlapping each other. Therefore, the telescopic stroke of the double-chamber outrigger is larger and can provide a larger span. Here is a way to identify the double-chamber outrigger. Observe the fixed chamber of the outrigger from one side of the vehicle. If you can see the fixed outrigger box and hydraulic pipeline of the outrigger on the other side, it is a double-chamber outrigger.
6、Winches of telescopic boom cranes Currently, the winches of truck-mounted cranes on the market are mainly hydraulic. According to different functions, there are two types: ordinary winches and two-speed winches. The two-speed winch can work at a faster winding speed when unloaded or lightly loaded, improving work efficiency.
The detailed configurations of truck-mounted cranes are roughly these. Mastering these, you can choose and purchase the appropriate truck-mounted crane without any concerns!
