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Installation Structure Of Truck Mounted Crane
- Aug 31, 2017 -

1. Support Leg Type

The legs of the truck crane can be divided into two types, manual and hydraulically operated. At present, manual manipulation of the leg has been rare, most of the car cranes are using hydraulic support legs. Hydraulic support legs can be divided into the following types.

(1) Frog-type legs

This leg of the movable leg hinged on the fixed leg, the expansion of the action by the hydraulic cylinder, characterized by simple structure, light weight, but the leg span is not small, only applicable to the smaller tonnage of the crane.

(2) H-type leg

This kind of leg has two hydraulic cylinders. Active leg stretched out, the work of the vertical leg support, shaped like H and named. The characteristic is that the leg span is larger, the adaptability to the site is good, and it has been widely used now.

(3) X-shaped leg

When this leg is working, the leg is X-shaped, from the ground clearance small, in the process of supporting the foot of the horizontal displacement occurs, when it is small amplitude, the space of the weight movement is larger than the H-type leg, so it is often mixed with H-type legs, forming the front h, after the type of x.

(4) radiation-supported legs

The rotary center of the turntable is centered, radiating outward from the frame's basin-shaped frame and extending 4 legs. The characteristic is the stability is good, in the lifting operation, the entire load does not pass through the frame but directly acts on the leg, back this, may reduce the frame weight and reduces the machine center of gravity height, protects the chassis not to be damaged. Mainly used in some oversize cranes.

(5) Swinging leg

This leg in the lifting operation, the leg under the action of the hydraulic cylinder can swing to the vertical axis of the frame with the position on the side, not working state, can be fixed parallel to the sides of the frame. Characterized by light weight, but due to the size of the space limit, the leg can not be too long, so the lateral support of the smaller distance.

The role of the leg is to provide a larger span of support for the crane when it does not increase the width of the crane, so as to improve its lifting characteristics without reducing the maneuverability of the truck crane. The failure of the leg has two kinds of mechanical parts and hydraulic system.