Published: 2025-06-11 13:44:23
Shanghai Suoqi Cable Analysis of Cable Breakage and Power Failure Factors in Tensile Grab Cables
In operational scenarios such as port machinery and ship hoisting, the stable operation of tensile grab cables is crucial. Recently, Shanghai Suoqi Cable conducted an in-depth analysis of issues such as broken cores and power failure in tensile grab cables.
1. Overview of Chip Breakage and Power Failure Issues
According to the technical team of Shanghai Suoqi Cable, a cable 'core break' refers to the fracture of the internal conductor of the cable under stress or fatigue, resulting in an interruption of the electrical circuit. The fundamental reasons why cables are prone to core breaks in grab bucket equipment involve multiple factors. Once a core break occurs, it is very likely to cause power supply failure, which not only can lead to grab bucket equipment losing control and halting operations, but may also result in interruptions to control signals, imbalance in power output, and a series of safety hazards, severely affecting operational efficiency and safety.
2. Analysis of Core Breakage and Power Interruption Factors
(1) Mechanical Fatigue Accumulation
Grab bucket cables are subjected to repeated coiling, bending, and stretching over the long term, placing them under high dynamic stress, and the conductor strands may break due to fatigue at frequent bending points. It's similar to a wire that is bent repeatedly; eventually, it will break at the point of concentrated stress.
(2) Improper structural selection
If cables that do not have high flexibility or tensile-resistant designs are used, their internal conductor structures are loose and the sheath protection is insufficient, which will lead to rapid failure under mechanical impact. In some work environments with higher requirements for cable performance, selecting the wrong type can easily cause cable problems.
(3) Unreasonable installation path
During the process of cable installation, issues such as too small a bending radius, sharp angles, or excessively long suspended lengths can accelerate localized fatigue concentration. For example, when the cable bending radius is smaller than the specified value, the internal conductors will be subjected to excessive compression, accelerating fatigue.
(4) Temperature and Environmental Interference
Outdoor high temperatures, salt spray, oil contamination, and other factors can cause cable insulation aging and conductor oxidation, reducing the overall strength of the cable. In some port areas, the corrosive effect of the salt spray on cables is significant. After being used for a period of time in a salt spray environment, ordinary rubber sheaths will experience a significant decrease in tensile strength.
3. Shanghai Suoqi Cable's Systematic Prevention Plan
A person in charge of Shanghai Suoqi Cable stated that to effectively solve these problems, systematic prevention is needed from multiple technical aspects including design, selection, installation, and maintenance.
(1) Optimize model selection design
Use highly flexible stranded conductors: It is recommended to use finely stranded high-conductivity copper wires (such as Class 6 ultra-flexible conductors), which can effectively resist the fatigue stress caused by repeated bending.
Built-in tensile components: Add tensile fiber or steel wire rope layers to the center of the cable to distribute longitudinal tension during traction and reduce conductor stress.
Enhanced layer design: Add a tear-resistant buffer layer between the conductor and the sheath, such as special rubber, non-woven fabric layers, or filler cords, to prevent stress concentration points from transferring to the conductor.
Suitable flexible sheath materials: Polyurethane-based sheaths are selected to enhance the outer layer's wear resistance while maintaining good softness at different temperatures.
(2) Standardize the installation process
Maintain sufficient bending radius: Ensure that the bending radius of the cable at turning or coiling positions is not less than 6 to 10 times the outer diameter of the cable, to avoid creating excessively bent points.
Avoid dangling and dragging: The cable should closely follow the guide rail or reel guide structure to prevent impact or friction damage caused by swinging while suspended.
Guide rollers and tension control devices: Add tension adjustment devices and roller guiding mechanisms in the drum system to make the cable's running path smoother and reduce local pressure.
Avoid contact with sharp edges: all cable contact points should be polished smooth or fitted with cushioning pads to prevent the sheath from aging prematurely due to prolonged wear, which could indirectly lead to core breakage.