Uses, features and models of crawler cranes

Uses, features and models of crawler cranes

  Crawler crane is a crane that installs the lifting device on the crawler chassis. In addition to being used for lifting operations in industrial and civil building construction and equipment installation projects, other working devices can be replaced or added, and it can also be used as a front shovel, puller, etc. Construction machinery such as shovels, grabs, drilling machines, pile drivers and underground diaphragm wall groovers. For lifting operations, it can be converted into a crawler-type tower crane. This crawler-type tower crane does not need to lay rails or pour concrete foundations during construction, which can greatly reduce the construction site and construction costs. Therefore, crawler crane is a kind of widely used lifting equipment. There are three transmission modes of crawler cranes: mechanical, hydraulic and electric. At present, hydraulic transmission is mostly used.

  Due to the large contact area between the crawler and the ground, the center of gravity is low, and the average specific pressure is small, the crawler crane can work on soft and muddy ground. It has a large traction capacity, strong climbing ability, can drive on rough ground, has a large lifting capacity and good stability. The crawler device of a large crawler crane can be designed to be horizontally telescopic to expand the supporting width. The disadvantages of crawler cranes are their heavy weight and low driving speed, so they are not suitable for long-distance operation. When transferring operations, they need to be transported by rail or hauled by flatbed trucks to prevent damage to the road surface.

  The model of crawler crane consists of category group, type, main parameters and variant code as follows:

  Crawler crane labeling example: QUY100—hydraulic crawler crane, the maximum rated lifting capacity is 100t.

(2) Basic structure of crawler crane

  A crawler crane is a crane that installs the lifting device on the crawler chassis. Its working mechanism is similar to that of a wheeled crane. The boom generally adopts a truss structure that can be extended.

  In addition to being used as a crane, it can also be used as a crawler pile frame. It is mainly composed of boom, working mechanism, turntable, traveling device, power device, hydraulic system, electrical system and safety device. Full hydraulic drive is adopted, and the diesel engine drives the hydraulic pump. The pressure oil output by the hydraulic pump is transmitted to the hydraulic motors of the lifting, luffing, slewing and traveling mechanisms through the control valve to generate torque, and then transmitted to the reel through the reducer. , driving wheels, etc., to achieve various actions. The lifting and slewing mechanism of the crawler crane is similar or the same as that of the wheeled crane, and the traveling mechanism is similar or the same as that of the hydraulic excavator. The luffing mechanism adopts the wire rope to pull the winding luffing.

  Main technologies of crawler cranes. Parameters: maximum lifting capacity, maximum lifting height, working range, working speed, machine weight and power, etc.

1 hook; 2 boom; 3 luffing winch mechanism; 4 lifting winch mechanism; 5 operating system; 6 cab; 7 traveling mechanism;8 hydraulic pump; 9 platform; 10 engine;11 luffing wire rope; 12 bracket; 13 tensioner; 14 hanging wire rope; 15 hoisting wire rope; 16 pulley block.