Truck cranes telescopic boom having three, all rotating hydraulic crane. It takes power plant located on the right chassis Transmission crane, crane from a traveling state to crane operation, the chassis-cab steering PTO engagement lever so after taking power plant; truck engine power is transmitted to the gear after taking power plant pump, the gear pump. Gear pump oil pressure generated by the hydraulic system driven crane operated leg and the car slewing, luffing, telescoping mechanism and the winding mechanism work.
Leg is "H" type structure, fixed to the front and rear legs are welded to the bottom of the underframe, the four legs are mounted in activity before and after the box-shaped fixing leg, the leg structure is hydraulically driven.
Activity leg by leg operated valve control, which movement can be alone operation, manipulation of the legs after the first generally horizontal leg extends vertically extending leg and then, when the first vertical leg is retracted after retraction, longer horizontal leg retracted. Boom sections are the three sides of the box-shaped boom, the telescopic mechanism is a single-stage cylinders plus wire rope.
To improve the stability of the telescopic cylinders, telescopic cylinders mounted upside down telescopic piston rod head and arm rear hinged basic, simple cylinder section ends with two hinged arm root. When extending the telescopic cylinder, the piston rod fixed with basic arm does not move, then the two-cylinder simple arm movement launched when the telescopic cylinder is retracted, the motion will be two cylinder arms back.
Hoisting mechanism made up of a hydraulic motor, two-stage cylindrical gear reducer, brake, reel, wire rope, lifting hook system. Which is normally closed brake friction plate dry-type brake, it's controlled by the brake cylinder, and in the process of lifting weights to achieve a parked anywhere without falling. In the lifting mechanism is equipped with a hydraulic circuit balancing valves to control the rate of decline in weight.
Slewing mechanism made up of a hydraulic motor, worm reducer, slewing bearings and other components. The swivel mechanism work, by gear pump supply pressure oil, quantitative motor, by controlling the rotation of the dispensing valve can achieve positive and negative direction of rotation.
Luffing mechanism is constituted by the boom, turntable with double-acting cylinders mounted a forward, its action is by luffing telescopic double-acting cylinder to achieve, luffing mechanism of action is to change the elevation of the arm, so that the hook the distance between the car and the center of rotation to be changed.
Here are some parameters of Dumper Loading Crane:
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