Electric Mooring Winch

DEJUN Electric Mooring Winch offers high efficiency, reliable performance, precise control, and low maintenance requirements. They are designed to withstand harsh marine environments and heavy-duty usage.

1. Compared with hydraulic transmission, the transmission device of the electric winch has the advantages of reliable operation, less maintenance, and low risk of oil leakage or pollution.

2. The electric motor has the brake of the automatic fail-safe device to prevent the winch and the motor from loosening the cable when the power is cut off.

3. The design of the transmission device of the electric winch and its related equipment should comply with the hazard level of its operating area.

1. The electric mooring winch controls installed should allow the operator to have a clear view of the mooring work area and other mooring members. The position of the control device should ensure that the operator does not pose a danger by moving parts.

2. The design and installation of platforms and gratings around electric mooring winches and their controls should consider providing continuous safe access to drums, controls, and maintenance points. Platform access should be single-level, horizontal, and deep/wide enough to allow two operators to work safely side by side or in tandem and move one or two steps in any direction. Platform access should be longer than the winch, from brake/control to drum/cable drum (if installed).

3. Multi-tiered platforms and platforms that do not meet the above recommendations should be avoided. Restricting the space around the electric mooring winch can severely limit the mooring team's ability to safely operate the winch, or to maneuver around the electric mooring winch to increase situational awareness during operations.

4. For ships with existing tonnage, ship operators should consider using the above recommendations to modify or expand existing platforms during the next planned ship repair period.

5. Guards should be provided to protect the operator from moving the machine and to be held by the operator while the vessel is moving.

6. A sealing device shall be installed around the deck winch to prevent oil leakage from the winch from polluting the working area. Consider using a remote control.

1. The electric mooring winch has the function of manipulating, holding, and storing the cable on a single drum.

2. The electric mooring winch is driven by an independent prime mover and can be reversed.

3. The electric mooring winch can work continuously at the nominal speed for 30 minutes under the drum load.

4. When running at the corresponding nominal speed, the drum load value should be between 22% and 33% of the designed rope-breaking load.

5. The supporting load is not less than 80% of the designed rope-breaking load.

6. The recovery load is not less than 50% of the drum load.

7. The release load is not greater than 50% of the design rope breaking load.

8. The electric mooring winch is equipped with an automatic control brake device. When the operating handle or handwheel is moved to the stop or brake position or the winch has no power, the automatic control brake device can automatically brake and can withstand the roll of the winch. When the drum is loaded, stop the drum rotation at the nominal speed without failure. The automatic control brake device can withstand the static load of 1.25 times the load of the reel, and the automatic control brake device of the electric mooring winch should not slip or be damaged. For the hydraulic mooring winch, a certain amount of slip is allowed, and the slip amount per minute does not exceed 1m.

9. The movement direction of the operating device is: when the handle is clockwise, or when the handle is pulled towards the operator, it is to reel in the rope, and vice versa. The direction of operation of all control handles is clearly and permanently marked. Regardless of the power used, when manually controlled, the operating device must automatically return to the brake or stop position.

10. Equipped with drum clutch so that the drum can be disengaged from the driving device and can be locked.

11. The drum diameter meets the following requirements:

① Using wire rope: The diameter of the drum shall not be less than 16 times the diameter of the design rope.

② Using polyester or polyamide rope: The diameter of the drum shall not be less than 6 times the diameter of the designed rope.

③ Using polypropylene rope: The diameter of the drum shall not be less than 4 times the diameter of the design rope.

12. When all the ropes are wound on the drum, the height of the flange of the drum beyond the outer rope should not be less than 1.5 times the diameter of the rope.

13. Strength requirements:

① When using 100% of the rated torque of the prime mover to calculate the stress of the transmission and other stressed parts, the calculated stress of the stressed parts shall not exceed 40% of the yield limit of the material.

② For the maximum torque of the prime mover corresponding to the worst working condition, the calculated stress of the stressed parts shall not exceed 90% of the yield limit of the material.

③ When bearing the braking load, the calculated stress of the stressed parts shall not exceed 90% of the yield limit of the material.

14. Load sensor: It can read the cable load on the brake. When the ship is moored and the cable is fixed to the brake of the winch, the cable load can be accurately displayed. For example, cargo control rooms, which allow for more frequent monitoring of cable loads, should not replace regular physical inspections of winches and mooring cables. The load sensor only provides the load of the cable on the brake and does not indicate the cable load when the brake is released and the winch drive is used. It is recommended that load cells be installed on new ships of over 16,000 DWT, with readings indicated at a local and central location (usually the cargo control room), and consideration should be given to retrofitting ships of existing tonnage.

Ready to elevate your marine operations with DEJUN's electric mooring winches? Our team of experts is standing by to assist you. Whether you have questions about our products or need guidance on choosing the right winch for your application, we're here to help. Contact us now and let's discuss how we can support your marine endeavors!

When choosing a mooring winch, the selection of the following components can be considered:

1. Transmission control device of the winch: manual or automatic tension adjustment.

Automatic tension adjustment: The drive of the mooring winch is directly controlled by the operator when winching in or out of the line during mooring operations. When the mooring operation is over and the winch is unattended, the winch will automatically winch in or out to maintain the set tension on the mooring line.

Self-tensioning winches cannot be used in automatic mode when connected to a cargo transfer system. In automatic mode, these winches could lose the line under load, causing the vessel to move out of berth, and posing a hazard to the boom and hoses. Tension self-adjusting units may also not be able to hold the same load as a manual winch equipped with main brake control.

2. The number of drums driven by a single winch: single drum or double drum.

Double drum: The transmission of the winch can drive multiple drums through the clutch device on the transmission shaft, and it is more common to drive two drums. This reduces the number of winch drives required and the winch drum can also share a drive with the winch drum or windlass.

3. Transmission of the winch: hydraulic or electric. 

The main types of electric winches currently on cargo ships are frequency control and pole change control.

① Frequency conversion control: The variable frequency-controlled electric winch is driven by a single-speed electric motor, which is controlled by a frequency converter, which is capable of continuously variable speed and control torque, smooth start, and smooth stop, similar to a hydraulic winch. The variable frequency control also provides an acceptable cable release speed.

②pole change control: Electric winches with pole-changing motors operate at fixed speed levels. Most pole-changing motors have three-speed levels, the first two are for normal operation and the third is a high-speed unwinding speed. On/off control for each fixed speed level. Other types of motors may be used provided that the appropriate functional and safety requirements are met.

4. Winch drum: separated or unseparated

① Split winch drum

Divided Advantages: Maintains constant brake hold and winch force as the mooring lines are designed to unwind in the first layer of the tension section.

The mooring lines do not sink into the lower layer when stressed because there is only one layer of line on the tension drum. This avoids potential damage to the mooring lines.

Split disadvantages: Mooring lines need to be transferred between storage rollers and tension rollers, which can cause damage and injury to mooring lines and personnel, and the risk should be reduced when planning mooring operations by taking into account the requirements of the mooring line, procedures, training, and operator experience.

② Undivided winch drum

Winch drum advantages: The mooring line does not need to be transferred from one drum to another as required by the separated drum, which eliminates the possibility of damage to the mooring line and injury to personnel.

Undivided disadvantages: The outer layer of the mooring cable is often embedded in the lower layer when stressed, and the mechanical winding device of the drum is easy to damage.

5. Brake of winch: belt or disc type.

The brake system of the winch includes the main brake and input brake.

An input brake system is an automatic brake system on the drive shaft that is required when an electric (and some hydraulic) transmission is used. Without input brakes, such transmissions are usually unable to hold position, otherwise, they can only spin freely and cause the mooring line to come loose under its own weight.

When the ship is moored, the main brake holds the roller in place, thus securing the mooring cable to the end of the ship. The main brake is designed to slide before the cable load becomes excessive, reducing the risk of mooring line breaks. A winch that provides drive to multiple drums requires a service brake for each drum.

Ideally, braking and slippage of the winch brake should be kept to a very small extent. The brake slip should only reduce the load enough to bring the mooring line tension back to a safe level.

The brake system of the winch is usually belt type. Although disc brake systems are commonly used as the main brake on high-load winches, for example, winches used in anchor lifting operations and towing operations, they are not common on liquid cargo ships.

① Disadvantages of belt brake:

A change in performance due to the physical strength of the operator when tightening the brakes.

Changes in the grip performance of the brake band due to wear, corrosion, moisture, or oil.

Sensitivity to the direction in which the cable is coiled.

These issues affect more or less different designs of brakes.

②Disc brake:

Typically used as the main brake on anchor handling and towing winches, but there are few if any, alternatives to band brake systems as the main brake on mooring winches. Disc brakes use calipers to apply friction to the disc. The calipers are usually power-operated and therefore allow for greater precision in setting the braking load. Disc brakes are equally effective in either direction of rotation of the winch.

6. Application of brake: mechanical screw or spring

① Mechanical Screw Brakes: Screw and hydraulically assisted band brake systems are not recommended for new vessels over 16,000 DWT.

Using simple screw belt brakes requires regular maintenance, regular load testing, and extreme care in operation to achieve predictable brake load settings, even when using a torque wrench.

The main problem with screw band brakes is manual operation. Once moored, the brake band will be stretched if the cable load increases. The operator may attempt to retighten the brake handwheel to the original handwheel torque setting. This practice could cause the mooring lines to break before the brakes slip. This problem can be mitigated by using a spring-loaded brake system.

② Spring brake: Manually operated spring brake. When the brake screw is tightened, the spring is compressed, and the compression is proportional to the brake holding load. When the brakes are tested and adjusted to the correct sliding force, adjust the indicator so that the brakes can be repeatedly reset to the correct value. This set indicator type of spring brake can fully compensate for the wear of the brake pads and the elongation of the brake mechanism.

7. Third-party inspection certificate:

Electric Mooring Winch has CCS, abs, BV, GL, KR, RINA ship inspection certificate

Our state-of-the-art electric mooring winches are designed to provide unparalleled performance and efficiency. With robust construction and advanced features, these winches promise long-lasting durability and seamless operation. Whether you're looking for a standard model or need something more specialized, we have you covered!

1. The user manual of the equipment manufacturer must be carefully kept by the buyer, and the operator must master it all.

2. After the product arrives at the factory, pay attention to safety during the transshipment project to prevent accidents.

3. It should be installed and checked by professionals.

4. The engine electrical personnel should test run according to the instructions.

5. Conduct technical training for operators according to the requirements of shipyards and ship-owners.

1. After the electric mooring winch contract is signed, a 30% deposit is paid in advance, and the contract becomes effective.

2. The approval drawings of electric mooring winches can be produced after being signed by the design institute, shipyard, and ship owners.

3. Delivery time is 30-90 days.

4. The warranty period is 12 months.

Note: The drive of the electric mooring winch is directly controlled by the operator when the cable is twisted or loosened during mooring operations. When the mooring operation is over and the winch is unattended, the winch drive should be turned off, the gears should be disengaged, and the winch drum and mooring cables should be controlled by the main brake.