How To Choose Cost-effective Lifting Equipment?

How to choose cost-effective lifting equipment?

 

Many friends will have doubts when purchasing, why are the cranes all looking the same, but the prices are so different? In order to avoid selecting hoisting machinery with excessive performance or affecting production, the basic mechanism of the crane, its uses, and structure are briefly described below. I hope it can help you.

 

There are many types of lifting machinery, some of which have operating mechanisms, luffing mechanisms, slewing mechanisms or other special working mechanisms. Materials can be suspended and lifted by flexible parts such as wire ropes or lifting chains, or they can be lifted by screws or other rigid parts.

 

 

What is the role of lifting machinery in modern society?

 

Hoisting machinery is an indispensable part of modern production. Some hoisting machinery can also perform certain special process operations during the production process to achieve mechanization and automation of the production process. Hoisting machinery helps humans in their activities of conquering and transforming nature, enabling the hoisting and movement of large objects that were impossible in the past, such as the segmented assembly of heavy ships, the overall hoisting of chemical reaction towers, and the overall hoisting of steel roof trusses in sports venues. wait.

 

 

What are the working structures of lifting machinery?

 

The working mechanism includes: lifting mechanism, operating mechanism, luffing mechanism and rotating mechanism, which are called the four major mechanisms of the crane.

 

① The lifting mechanism is a mechanism used to realize the vertical lifting and lowering of materials. It is an indispensable part of any crane, and therefore is the most important and basic mechanism of the crane.

 

② The operating mechanism is a mechanism that realizes horizontal transportation of materials through the operation of a crane or a lifting trolley. It can be divided into trackless operation and tracked operation. According to its different driving methods, it can be divided into two types: self-propelled and traction.

 

③ The luffing mechanism is a unique working mechanism of jib crane. The luffing mechanism changes the operating range by changing the length and elevation of the boom.

 

④ The rotating mechanism makes the boom rotate around the vertical axis of the crane to move materials in the annular space. The crane achieves the purpose of transporting materials through the individual movement of a certain mechanism or the combined movement of multiple mechanisms.
 

 

How to choose the necessary driving device for lifting machinery?

 

The driving device is used to drive the power equipment of the working mechanism. Common driving devices include electric drive, internal combustion engine drive and human power drive.

 

Electric energy is a clean and economical energy source. Electric drive is the main driving type of modern cranes. Almost all bridge cranes, gantry cranes, jib cranes, winches, elevators, elevators, etc. that operate within a limited range are driven by electric power.

 

Mobile cranes that can move over long distances (such as tire cranes and crawler cranes) are often driven by internal combustion engines.

 

Human power is suitable for some light and small lifting equipment, and is also used as an auxiliary, backup drive for some equipment and as a temporary power for accidents (or accident conditions).

 

How to choose an object retrieval device according to the working environment?

 

The pick-up device is a device that links materials with a crane for lifting and transporting materials by lifting, grabbing, sucking, clamping, holding or other means. Different types of fetching devices are used according to the different types, shapes, and volumes of the materials to be lifted.

 

For example, hooks and rings are commonly used for finished items; grabs and hoppers are commonly used for bulk materials (such as grain, ore, etc.); cylinders and tanks are commonly used for liquid materials. There are also special hoists for special materials, such as lifting overhead monorail system beams for lifting long materials, lifting electromagnetic chucks for lifting magnetically conductive materials, rotating hooks specially used in metallurgy and other departments, and spiral unloaders. And pickup devices such as bucket wheel unloading, as well as special spreaders for containers, etc. A suitable retrieval device can reduce the labor intensity of workers and greatly improve work efficiency. Preventing the hanging objects from falling, ensuring the safety of the workers and ensuring that the hanging objects are not damaged are the basic requirements for the safety of the retrieval device.

Metal structure

 

The metal structure is made of steel rolled from metal materials (such as angle steel, channel steel, I-beam, steel pipe, etc.) and steel plates as basic components. It is connected according to certain composition rules through welding, riveting, bolt connection and other methods to withstand the load of the 50 ton crane. Self-weight and load-bearing steel structures.

 

The weight of the metal structure accounts for about 40% to 70% of the weight of the entire machine, and up to 90% for heavy cranes; its cost accounts for more than 30% of the cost of the entire machine. According to their structure, metal structures can be divided into two types: solid belly type (made of steel plates, also called box structures) and lattice type (generally made of section steel, with common root frames and lattice columns), which form the metal structure of the crane. The basic stressed member of the structure.

 

These basic force-bearing members include columns (axial force-bearing members), beams (bending members) and booms (pressure-bending members). Different combinations of various components form cranes with different functions. Complex forces, heavy weight, many consumables and overall mobility are the working characteristics of the crane's metal structure.

operating system

Through the electrical and hydraulic systems, the movements of each mechanism of the crane and the entire machine are controlled and controlled to perform various lifting operations. The control and manipulation system includes various manipulators, displays and related components and circuits, and is the interface for human-machine dialogue.

 

The significant difference between a crane and other general machines is its large, movable metal structure and the combined work of multiple mechanisms. Characteristics such as intermittent cyclic operations, uneven lifting loads, inconsistencies in the movement cycles of various mechanisms, non-chronicity of mechanism loads, and cooperative operations involving multiple people have increased the complexity of the crane's operations and potential safety hazards. Many, the danger range is large. There are many accident-prone points and the consequences of accidents are serious, so the safety of cranes is particularly important.
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