Answer from Ningbo Changshi: The design of the pulling mechanism—either a drum or a bullwheel—is a crucial difference that impacts performance, especially for underground projects.

• Drum Winch: This is a simpler design where the pulling rope is spooled directly onto a drum. The pulling force is generated by the rope winding onto the drum. The primary disadvantage is that as the rope layers build up, the effective diameter of the drum increases, causing the pulling force and speed to fluctuate. This makes it difficult to maintain consistent tension.

• Bullwheel Winch: This is the preferred method for professional utility work. The pulling rope makes several wraps around a grooved, double-sided bullwheel. The winch's hydraulic motor rotates the bullwheel, generating a constant pulling force. The rope itself is then stored on a separate, non-driven storage reel. This design provides constant speed and tension throughout the entire pull, regardless of the length of rope being pulled. This consistency is essential for avoiding damaging surges in tension, especially in long, complex conduit runs.

Our winches are equipped with the superior bullwheel design, ensuring a reliable and professional-grade solution for all your underground cable installations.