311 results about "Mobile crane" patented technology

A load-lifting apparatus has one or more prime power sources, one or more energy storage systems and regenerative braking. Regenerative energy is recovered when the load-lifting apparatus lowers its load. The elements of the prime power sources, energy storage devices and electrical components may be distributed to provide stability for the load-lifting apparatus. The general power architecture and energy recovery method can be applied to cranes, rubber-tired gantry cranes, overhead cranes, mobile cranes, ship-to-shore cranes, container cranes, rail-mounted gantry cranes, straddle carrier cranes and elevators. In such an architecture, the energy storage system helps alleviate the power rating requirement of the prime power source with respect to the peak power requirement for lifting a load.

The invention relates to an automatic leveling oil gas suspension mechanism, which comprises at least two pairs of suspension oil cylinders (12), a vehicle body dip angle adjusting unit (17), a vehicle body traverse dip angle sensor and a control unit, wherein each suspension oil cylinder is provided with a vehicle body dip angle adjusting unit with a balanced oil cylinder (10) correspondingly; and one cavity of the balanced oil cylinder is connected to an oil tank (5) and a leveling operating oil source by a first one-way damper valve (8) and an electronic control switching valve (14), and the other cavity of the balanced oil cylinder (10) is connected to a rodless cavity of each suspension oil cylinder by an electronic control lockup valve (14) and a second one-way damper valve (9). In addition, the invention also provides a mobile crane with an automatic leveling oil gas suspension mechanism. The automatic leveling oil gas suspension mechanism realizes the function of dynamic leveling of various roads, particularly traverse rampways, of the mobile crane effectively, and is simple in operation and high in logicality; and the operation is completed automatically by the control unit, so the running safety is improved obviously, and accidents such as overturn and the like are prevented from occurring.

The invention proposes a hoisting-cable drive for a mobile crane, which hoisting-cable drive uses a single bottom-hook block (15) instead of a known double bottom-hook block. However, to prevent this single bottom-hook block (15) from tilting in the two cable lines (9, 10), for example due to possible variations in the elongation of the two cable drives, the hoisting-cable drive according to the invention comprises a kinematic force equilibrium device (17, 21), which can equalize such differences. To this effect, another embodiment of the hoisting-cable drive according to the invention uses a hoisting-cable load pickup (21) within each cable line arrangement so that the rotary speed of the winches (7, 8) can be varied, taking into account any load differences in the individual hoisting-cable lines (9, 10). Furthermore, the invention also proposes that the rotary speed of the winches (7, 8) be adjusted, taking into account the geometric winch states and crane states.

Provided is a mobile crane capable of adjusting a counterweight height with no use of a costly hydraulic cylinder. The mobile crane comprises a lower propelling body, a upper slewing body, a boom pivotably attached to the upper slewing body, a mast which is at the rear of the boom and adapted to be raised and lowered so as to raise and lower the boom, a counterweight which is at the rear of the upper slewing body and hung from the mast through a guy line, and a counterweight-lifting cylinder attached to the counterweight so as to be extended to vertically push up the counterweight with respect to a ground surface. The counterweight-lifting cylinder has a cylinder body, a piston partitioning an internal space of the cylinder body into an upper head-side cylinder chamber and a lower rod-side cylinder chamber, and a rod extending from the piston downwardly beyond an lower end of the cylinder body. the counterweight-lifting cylinder is extended by supply of a hydraulic pressure into the head-side cylinder chamber and retracted by supply of a hydraulic pressure into the rod-side cylinder chamber.