Lifting machinery is an essential piece of equipment for material handling, possessing lifting, lowering, and horizontal movement functions. It is indispensable in industrial production, warehousing and logistics, and construction sites. There are many types of lifting machinery, including bridge cranes, gantry cranes, tower cranes, mobile cranes, portal cranes, elevators, cable cranes, mast cranes, and mechanical parking equipment.
Bridge crane
Bridge cranes are essential equipment for material handling. They are firmly supported at both ends by tall concrete pillars or metal supports, and the bridge structure runs longitudinally along the tracks laid on the elevated structures on both sides, effectively avoiding interference from ground equipment and greatly improving work efficiency.
Tower crane
Tower cranes are an indispensable type of heavy equipment on construction sites. They provide strong support for the entire construction process by lifting and transporting various raw materials required for construction through standardized segments.
Application of load cells in lifting machinery
Weighing technology has a long history of application in the field of lifting machinery. With the rapid development of electronic weighing technology, lifting machinery is constantly moving towards mechanization, automation, integration, and intelligence. As industrial production scale continues to expand and production efficiency continues to improve, large-scale, high-speed, and specialized lifting machinery is gradually becoming the mainstream, exhibiting more significant automation, intelligence, and information-based performance characteristics.
Currently, the most widely used device on lifting machinery in China is the lifting capacity limiter. This device effectively prevents overloading of lifting machinery by detecting the lifting weight, thereby avoiding potential safety risks. It is not only widely used on various lifting devices such as tower cranes and bridge cranes, but also serves as a precise weighing system, ensuring the safety and efficiency of lifting operations.
A lifting capacity limiter typically consists of two core components: a resistance strain gauge load cell and a weighing control instrument. The load cell accurately detects the lifting weight, while the weighing control instrument uses this information to make judgments and output corresponding status control signals. The working principle of a resistance strain gauge load cell is based on the physical phenomenon that when an elastic body (such as an elastic element or a sensitive beam) is subjected to external force, it undergoes elastic deformation, which in turn causes the resistance strain gauge attached to its surface to deform. After deformation, the resistance of the strain gauge changes (increases or decreases). Through a corresponding measuring circuit, this change in resistance can be converted into an electrical signal (such as voltage or current), thus realizing the process of converting external force into an electrical signal and achieving precise measurement and control of the lifting weight.
