Herringbone pull lever pull lever forward tilt when lifting
Herringbone pull rod
Herringbone pull rod is normally provided by two logs or two steel wire rope lashing or iron pieces hinged together. The advantage is that the lateral stability than the one-man pull rod is good, the use of a small number of wind cable rope, but the component after lifting a small range of activities. Herringbone pull rod bottom with rod or rope to balance the horizontal thrust, two angle is generally about 30 °. Herringbone pull lever pull lever forward tilt when lifting, there are two wind cable in the back rope. To ensure that when lifting the bottom of the pull rod firmly, pull the lever in a bottom mounted a guide pulley, lifting cable connected to the winch through it, and then the other on a rope connected to the anchor.
Roundwood herringbone pull rods, from the weight of 40 ~ 140kN, pull rod length 6 ~ 13m, roundwood small diameter 200 ~ 340mm; steel herringbone pull rods, from the weight of 100kN, pull rod length 20m, pipe diameter 273mm, wall thickness 10mm; starting weight 200kN, pull rod length 16.7m, pipe diameter 325mm, thickness 10mm.
(Three) cantilever pull rod
Pull lever arm pull rod in the middle-man or 2/3 of the height of the boom from a device. It is characterized by a lifting height and lifting larger radius, boom scissor pallet truck angle is also large. But this crane lifting capacity is small, light elements used for lifting. Boom can be mounted on the derrick, derrick pulling a lever.
Edit this paragraph mast crane is required to use non-standard cranes, generally used by the site constraints, the other can not be lifting cranes occasions.
(A) the basic structure of the mast crane and classification
Mast crane structures: the mast body, lifting systems, stability systems, power systems
Mast Body: mast base and accessories.
Mast form of the structure is divided into lattice and solid abdominal (usually steel) cranes.
Lifting system consists of pulleys, steering wheel and rope and other components.
Stabilization system including wind cable ropes, anchors, etc.
Power system is mainly electric winch, there are hydraulic devices.
(Two) wind cable rope pull rope wind calculation and the choice of cable
Wind cable wire is mast crane stability system, related to the safety of the crane, affecting mast axial force. Wind cable rope pull into the work force and the initial tension.