Construction Crane Knowledge revealed
1. Classification of construction cranes
Construction crane mainly include auto crane, tyre crane, all terrain crane, lorry crane, crawler crane, tower crane, mast cranes, cable crane and construction hoist is widely used in transportation, such as oil fields, mines, ports, steel, water and electricity, war industry and all kinds of engineering construction and other industries, is the wide application of lifting transport equipment.
2. Main performance parameters of construction crane
The main performance parameters of the construction crane include lifting weight, lifting moment, working range, lifting height, working speed, dead weight and other indicators. These parameters indicate the working performance and technical and economic indicators of the crane. It is the technical basis for the design of the crane and the main basis for the user to choose the crane.
Lifting moment: the product of lifting weight and corresponding working amplitude of the crane is called lifting moment, which is a comprehensive index to measure the operating mechanism of the crane.
Lifting height: refers to the distance between the support leg or rail support surface and the center of the hook mouth. Rated lifting height refers to the maximum lifting height when full load.
Working range: the distance between the center axis of the crane’s rotary center and the center of the hook is usually measured under the condition of lifting weight. Due to the deformation of structural parts during the lifting of the weight, the range of general tonnage products during the lifting of the weight is 0.5 to 2 meters larger than that during the no-load period.
Working speed: speed is measured actuator operation speed, including hoisting, luffing, turning and walking speed, which is divided into single rope hoisting speed, empty hook speed, full load speed, expressed as a unit of m/min, turning speed expressed as a unit of r/min, luffing refers to hook from the biggest to the smallest extent when the average linear velocity, is usually measured by the time required for seconds.
Deadweight: the deadweight of the crane is the whole weight of the crane itself when the crane is in working state.For the same performance of the crane, the light weight means that the crane design is reasonable, reliable manufacturing.
Lifting weight: The lifting weight value of the crane is called lifting weight. Lifting weight parameters of the crane are usually expressed by rated lifting weight.
3. Working mechanism and principle of construction crane
In order to complete the function of the construction crane, the construction crane is generally composed of the base support part and the vehicle-mounted operation part, etc. For the mobile crane, the base support part includes the bearing structure such as the chassis which can be driven on the road and the frame support leg, etc. At the same time, the chassis also provides power for the vehicle-mounted operation through the center rotary body;Get in the assignments section includes realization on 360 degree rotary rotary support, slewing reducer, rotary slewing mechanism of hydraulic system, hydraulic system of transformer oil cylinder and transformer by luffing mechanism of the winding speed reducer, hoisting wire rope, lifting hydraulic system consisting of the lifting mechanism, and a dynamic scalable main arm, vice arm, turntable, weight, get in operation room, electrical control or lighting system and so on.
Engine power output after transmission of the office of the oral handed off more pumps, the mechanical energy into hydraulic energy, and then the hydraulic pressure can be delivered through multi-channel distribution valve for each cylinder, motor, the hydraulic energy into mechanical energy, perform component implementation of linear and rotational movements, so as to realize the rotary, lifting, scale and range of movement.