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Depending on the structure of the boom, Isuzu truck-mounted cranes are divided into two types: straight arm type and knuckle arm type. There are also many differences between these two forms in terms of operability, functionality and safety. The following only takes the widely used front-mounted truck-mounted crane as an example to illustrate the difference between straight-arm and knuckle-arm truck-mounted transport trucks.

Isuzu straight-arm truck-mounted lifting transport truck, the crane is mainly composed of a telescopic arm, a hook (or grabber), a slewing mechanism, a winch and a frame. Since the boom cannot be folded, the hoisting of objects must be done by a hoist driving the hook through the steel cable. It is very popular in terms of operability, functionality and safety. It also has simple structure, low cost and easy operation. Features.

Isuzu folding-arm truck-mounted lifting transport truck. The main body of the truck-mounted crane is composed of a base, a main arm, an inner arm, a telescopic arm, etc. It completes lifting and hoisting by rotating, multi-joint bending, and horizontal telescopic movements. Generally, a hook is used to directly Lifting, special vertical lifting. Hydraulic winch can be configured as needed. Since this type of truck-mounted crane is hydraulically operated, it can be matched with many hydraulic attachments (grabbing forks, drills, clamps, and holds) to complete more complex operations. After the operation is completed, the whole machine folds into a "4" shape. The shape, width and height are all within the range of 2500mm. Therefore, the folding alarm truck-mounted lifting transport truck has the characteristics of low center of mass, light weight and multiple functions, and is suitable for many operating situations including various complex operations.

Structural form: The boom of a straight-arm truck-mounted crane is a fixed linear structure with no telescopic and foldable parts. The boom of a knuckle-arm truck-mounted crane is composed of multiple folding arms that can be unfolded or folded as needed.
Folding method: The folding arm of the knuckle-boom crane can be unfolded or folded through a hydraulic system or mechanical mechanism. This structure makes the knuckle-boom crane more flexible when entering and exiting narrow spaces on the construction site. Straight boom cranes do not have folding parts and cannot be folded.
Extension range: The boom length of a straight-arm truck-mounted crane is fixed and cannot be extended or shortened. The folding arm of the knuckle-boom crane can be extended or shortened as needed to adapt to different lifting tasks.

Size and load capacity: Straight boom cranes are generally larger and heavier than knuckle boom cranes and have higher load capacity. Knuckle boom cranes are generally used for smaller lifting tasks, while straight boom cranes are suitable for larger lifting tasks.
Stability: The boom structure of a straight-arm crane is relatively stable and can provide better balance and support. Due to the structure of the folding arm, the knuckle boom crane may sway to a certain extent when extended.
Operation flexibility: It is difficult to adjust and position the straight-arm crane during work, and generally requires the use of auxiliary equipment. Knuckle-boom cranes can be adjusted and positioned more flexibly due to the presence of folding arms.

Generally speaking, straight-arm cranes are suitable for large-scale hoisting tasks and have high load-bearing capacity and stability, but they may be slightly inferior in flexibility and adaptability. Knuckle-boom cranes are suitable for smaller lifting tasks and have good flexibility and adaptability, but their carrying capacity is generally small.