Answer from Ningbo Changshi: Modern underground winches are not just about raw power; they are intelligent machines designed to protect the integrity of the cable. The key is the integrated tension control system. This system works by:

1. Real-Time Monitoring: A load cell or pressure sensor continuously measures the tension on the pulling rope. This data is displayed on an easy-to-read, digital instrument panel, giving the operator immediate feedback.

2. Automatic Overload Protection: The operator or project engineer can preset a maximum pulling force. If the tension exceeds this limit—due to friction, a snag, or a tight bend—the system automatically reduces the pulling speed or shuts down the winch completely. This prevents the cable from being overstressed, which could cause internal damage.

3. Data Logging: Our most advanced winches include an onboard data logger with a USB port. This device records the pulling tension, speed, and distance throughout the entire pull. This data provides a permanent record for quality control, project documentation, and is essential for verifying compliance with the cable manufacturer's specifications.

This level of control ensures the cable is pulled safely and efficiently, minimizing the risk of costly damage.