The tire-type crane, commonly known as the tire-type crane, refers to a boom rotating crane that uses a tire-type chassis to travel. A luffing jib crane that travels on a tire-type chassis. A tire-type crane is a full-rotation crane in which the lifting mechanism is installed on a special chassis composed of heavy-duty tires and axles. Its upper structure is basically the same as that of a crawler crane. In order to ensure the stability of the body during installation operations, the crane Features four retractable legs. On flat ground, the outriggers are not needed for small lifting loads and low-speed driving of hoisted objects. It consists of two parts: getting on and off. The upper part is the lifting operation part, which is equipped with a boom, hoisting mechanism, luffing mechanism, counterweight and turntable, etc.; the lower part is the support and walking part. The upper and lower carriages are connected by slewing bearings. When lifting, it is generally necessary to lower the outriggers, increase the supporting surface, and level the fuselage to ensure the stability of the crane.
According to the form of the chassis, there are two types: tire cranes and truck cranes: the former uses a special chassis with a short body and flexible operation; the latter's lifting operation part is installed on the car chassis, the body is long, and it has the driving performance of a truck. Quick transfers alone or in a platoon with cars.
Compared with truck-type cranes, its advantages include: wider wheelbase, good stability, short body, small turning radius, and can work within a 360-degree range.
However, it has higher requirements on the road surface when driving, and its driving speed is slower than that of a car, so it is not suitable for working on soft and muddy ground.
A luffing jib crane that travels on a tire-type chassis. It consists of two parts: getting on and getting off the bus.
There are two structural forms of boom: truss arm and telescopic arm. The former uses a wire rope pulley block to luff the amplitude, and the arm length can be folded or extended, and its length is larger; the latter is a multi-section box-shaped telescopic boom that uses a hydraulic cylinder to telescope and luff the amplitude. Due to its small size, the driving state adapts to the needs of rapid transfer to the construction site. The working mechanism can be mechanical, hydraulic and electric. The hydraulic type has the advantages of compact structure, convenient operation, easy speed adjustment and overload protection. Tire-type cranes are usually used for loading and unloading heavy objects and installation operations. When the lifting capacity is small, they can be operated without outriggers and can even travel with a load. It has the characteristics of good maneuverability and convenient transfer, suitable for mobile operations and widely used. Its basic technical parameters are: lifting weight, lifting height, amplitude, load moment and self-weight of the whole machine. The rated lifting capacity of the tire-type crane is limited by the strength of the boom and the stability of the whole machine, and changes with the amplitude. A torque limiter must be installed to prevent overloading. Truck cranes are developing rapidly due to their fast travel speed, flexible transfer, and convenient supply of automobile chassis and parts. In particular, telescopic boom truck cranes are developing rapidly. Tire cranes have further developed in the direction of improving mobility and off-road performance. New tire-type cranes such as polygonal special-shaped section telescopic arms, box-shaped radial chassis, and movable counterweights continue to appear.
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