What are the characteristics of mobile tyre gantry cranes?

Mobile tyre gantry cranes are another type of popular lifting equipment among customers. It has a simple structure, a large lifting capacity, a reasonable cost, and can be transferred to another site. The rubber-tired gantry crane is a machine for loading, unloading, transferring, and stacking operations in the container terminal yard. At present, the lifting capacity of rubber-tired gantry cranes is mostly 30 tons, the span is the width of 6 containers and 1 chassis lane, and the lifting height is about 11–12 m. The main advantage of the mobile tyre gantry crane is that it can effectively use the storage yard, and the construction cost of the storage yard is relatively low, flexible, and versatile. It can not only advance and retreat but also have steering equipment, and through the 90-degree rotation of the wheels, it can be transferred from one box area to another box area for operation.

The technical principle of a rubber-tired gantry crane:

(1) Principle of crane lifting. The elevation angle of the main arm is adjusted by the hydraulic cylinder, and the reel is driven by the hydraulic motor to retract (unwind) the steel rope, the elastic boom, and the lifting hook to lift the heavy object.

(2) The principle of boom elasticity. There is a rolling drum under the inside of the boom, and a wire rope is wound on it. The wire rope passes through the pulley on top of the next boom to pull the last boom out, and so on. When retracting, the drum reverses to retract the wire rope, and the boom retracts under its own weight.

The characteristics of the rubber-tyred crane are: all-wheel drive, the upper and lower drivers have independent parking spaces, and at the same time, they have the power to lift and move, can maintain stable performance during internal travel, and have certain off-road functions. The lifting function of the rubber-tired crane is very strong, and it has a very good outrigger effect. Different chassis structures can be used to achieve different driving functions. On the chassis of the engine, there will be four different pumps to achieve the overall driving force.

The mobile tyre gantry cranes mainly have the following two characteristics:

1. It adopts a full hydraulic drive, including a travelling mechanism, a steering mechanism, and lifting mechanism. The hydraulic transmission is small in size, light in weight, small in inertia, easy to operate, and reliable in its work. Adapt to various places without a power supply, a self-contained power system, a cement or asphalt road surface, strong site adaptability, and flexible maneuverability. The main hydraulic components — pumps, motors, and reducers — are all imported products, and the whole machine has strong reliability. The whole machine has a simple structure and is light in weight. The operating mechanism has the functions of transverse running, longitudinal running, 360° rotation with the geometric center of the vehicle as the center, forward, backward, and braking.

2. The four-point lifting and three-point balancing technology can ensure the balance of the entire system under the condition of uneven load weight distribution, and no one of the four lifting points will be overloaded. The control unit adopts advanced electro-hydraulic technology, and the control actions of all systems are completed by solenoid valves, without the need for manpower to operate various valve groups, which improves the comfort of operation, reduces labour intensity, and meets the requirements of ergonomics. Under each group of tires, an anti-run-flat tyre tipping device is provided. If one or a group of tyres blow out when an accident occurs, the anti-run-flat tyre device can work in time to prevent accidents such as equipment tipping over. The multi-lifting point combined lifting device is adopted. The lifting device has multiple lifting points along the horizontal direction, and the distance between the lifting points can be adjusted on site according to the needs of customers to meet the requirements of different lifting states.

Henan Dejun is a manufacturer of lifting and handling solutions with more than 30 years of experience in crane design, research and development, manufacturing, installation, etc. with intelligent cranes, hydraulic gantry cranes, container gantry cranes, mobile tyre gantry cranes, European cranes, and various non-standard cranes. With import and export rights, it is a qualified supplier of the world's top 500 companies, providing non-standard customized various types of cranes and program services for more than 5,000 companies around the world.