Characteristics and main structural functions of underhung cranes

Underhung overhead crane are lifting equipment that are placed horizontally over workshops, warehouses and stockyards for lifting materials. Because the two ends of the bridge’s underhung cranes are located on tall cement columns or metal supports, and are shaped like a bridge, they are commonly known as “overhung cranes” and “driving cranes.” It is a kind of lifting machinery with wide range of use and large quantity.

Sevencrane underhung overhead crane are important tools and equipment for mechanizing and automating the production process in modern industrial production and lifting transportation. They can reduce the labor intensity of operators and improve productivity. Bridge cranes are widely used in industrial and mining enterprises, steel and chemical industries, railway transportation, ports and terminals, logistics turnover and other departments and places. It is an indispensable piece of equipment in people’s production activities.

There are many types of industrial underhung overhead crane, among which general underhung cranes and gantry cranes are more common. The structures and operating methods of these two types of cranes are basically the same. The difference lies in the position of the trolley’s running track. The general bridge crane is at high altitude, and the gantry crane is It is on the ground, which brings about a difference in the supporting structure.

Although there are different types and models of underhung cranes, with differences in appearance and structure, they all have one thing in common, which is the way they work intermittently. A working cycle generally includes: displacing the material through the lifting and lowering of the fetching device, and then moving in the opposite direction to return to the original position or another position for the next working cycle. Between the two working cycles, time, usually a short interval. It can be seen that when underhung cranes are working, each mechanism is often in an alternating state of movement such as starting, running, braking, and forward and reverse phases. In addition, underhung cranes also have the following working characteristics:

1. Top manufacturers underhung overhead crane machinery usually has a huge metal structure and a relatively complex mechanical structure. It can complete one lifting, lowering or several horizontal movements. During the operation, there are often several movements in different directions at the same time, which is technically difficult.
2. The materials to be hoisted are diverse, and the load also changes. The weight can range from tens of tons, or even hundreds or thousands of tons, to the light weight of tens of kilograms; the length can range from tens of meters to less than 1 meter; and the shape can vary. Regulations, as well as granular, hot-melt and flammable and explosive materials, make lifting work complicated and dangerous.
3. Most crane equipment needs to operate within a large range, and some are equipped with rails, steel wheels or tire-type crawlers, which have large space for movement and large danger surfaces.
4. There are many exposed moving parts, which are often in direct contact with lifting personnel (such as hooks and ropes).
5. The working environment is complex. There are lifting equipment in operation in industrial and mining enterprises, ports, construction sites and other places. The operation will also encounter dangerous factors such as high temperature, high pressure, flammable, explosive, power transmission lines, strong magnetic fields, etc. These Adverse conditions are detrimental to both people and equipment.

6. Operations often require human cooperation and are quite difficult. Operators and commanders are required to cooperate, collaborate and take care of each other skillfully. Operators should have the ability to deal with on-site emergencies.

With the rapid development of modern industry and the continuous advancement of science and technology, bridge-type cameras have undergone some new changes and new features in terms of structural design and degree of automation.
For example, structurally, underhung cranes equipment adopts computer-optimized design to improve the mechanical performance of the crane and reduce its own weight. In terms of performance, we continue to introduce advanced foreign technologies and adopt novel energy-saving speed regulation systems, such as thyristor cascade open-loop or closed-loop systems. The speed regulation ratio can reach 1:30. As the requirements for speed regulation increase, variable frequency speed regulation systems And microcomputer control technology has also been applied in heavy duty underhung overhead crane.
In short, with the rapid development of science and technology, various domestic advanced electrical control and mechanical technologies are gradually being applied to cranes. Underhung cranes are becoming more and more automated, their structures are becoming simpler, their performance is more reliable, and their lifting capacity is getting larger and larger. The variety is also becoming more and more complete.