windlass

Let Qin Mo Hai Gong analyze the operation characteristics of the windlass for you:

(1) Put away the anchor chain lying on the bottom of the water. At this time, the windlass motor is running at full speed, and the load torque on the motor shaft is constant. The ship slowly approached the anchor point under the pull of the windlass. The overhang of the anchor chain will not change shape.

(2) Tighten the anchor chain. At this time, the anchor machine will tighten the anchor chain, the load torque on the motor shaft gradually increases, the speed decreases, and the shape of the overhanging part of the anchor chain changes until the anchor chain is straightened. The ship moved on.

(3) Pulling the anchor unearthed. After the anchor chain is tightened, the anchor is pulled out by the inertia of the ship's advance. If it can not be pulled out, the motor will occur "blocked rotation" phenomenon, that is, stop rotating at a large blocked current. In order to prevent the motor from burning out due to blocking, the motor is required to have "soft" mechanical characteristics, and the blocking torque is 2 times the rated torque. In order to avoid too long a blocked rotation time (specified as 1 min), the driver can drive slowly and pull the anchor by the force of the propeller.

(4) Remove anchors and chains suspended in the water. After the anchor was unearthed, the motor load torque suddenly decreased and the motor speed increased. With the shortening of the cable, the load torque decreases gradually.

(5) Pull the anchor into the hawse hole, and the motor runs at a low speed. When the anchor enters the hole, the load torque of the motor increases due to the friction between the anchor and the steel plate of the hawse hole.