1. Bulk carrier: constant tension device (operated by anchor winch pump under low load, provided by gear shifting), and the operation on board can be solved by one person on site.

2. Chemical tanker: the braking device needs the breaking force of the cable. The constant tension device cannot be used to prevent the oil pipe from breaking and polluting the wharf due to the ship's displacement.

3) Hydraulic hatch cover (also called access equipment)

Used for bulk carriers, driven by hydraulic system, with working pressure of 200-250kg and side rolling. During design and operation, the working pressure and oil cleanliness must be ensured. The whole system includes jacking and locking oil cylinder, oil motor and valve group. Please refer to the pump pressure diagram. Manufacturer: Masica Company.

4) Crane crane

Crane is a kind of equipment for loading and unloading goods, which has the characteristics of large lifting capacity, convenient operation, impact resistance, good braking performance, safety and reliability, high loading and unloading efficiency and good adaptability to goods.

Hydraulic crane is a commonly used loading and unloading equipment on ships, which has the characteristics of large lifting capacity, convenient operation, impact resistance, good braking performance, safety and reliability, high loading and unloading efficiency and good cargo adaptability. There are more than 1000 types of hydraulic cranes used on ships of major shipping companies in China, and there are more than 500 types of hydraulic cranes used on ships belonging to COSCO (Group) Corporation. Hydraulic crane is a kind of ship cargo lifting equipment with high technical content, which integrates electricity, liquid and machinery. In the process of use, technical management personnel with certain professional knowledge are required to carry out daily maintenance as required. In practical work, due to the lack of proper maintenance, improper operation and use, bad working environment and disrepair, hydraulic cranes often cause high failure rate. According to the 5-year statistics made by a shipping company on the maintenance cost of 25 hydraulic cranes used on 5 ships belonging to it, the annual maintenance cost of each ship hydraulic crane exceeds 2 million yuan. In view of many problems existing in the use of hydraulic cranes, Shanghai Maritime College and Shanghai Ocean Shipping Company formed a research group on 1997, studied the types, causes, maintenance management and problems existing in the maintenance process of hydraulic cranes, and put forward a series of measures, which achieved remarkable results.

The rectification work of hydraulic crane mainly starts from three aspects: first, the research group organizes relevant experts, maintenance managers and hydraulic crane managers to analyze and classify the fault types and causes of hydraulic cranes, and compile technical documents with practical value for ship managers to implement and constantly improve in use; Second, by improving the professional knowledge, fault diagnosis ability and maintenance skill training of managers, the maintenance management level of managers is improved and proactive preventive maintenance is actively promoted; Thirdly, aiming at the problem that 70% faults of hydraulic system are related to the cleanliness of oil, the cleanliness of hydraulic system should be strictly controlled to keep it within the allowable range.

Before the project, most of the docks used cranes, and bulk carriers no longer need to make their own equipment. Basically produced by the equipment factory, its operation methods include: on-site operation; Controlled by the control valve group on the hatch cover; Above the hatch cover.

5) Bow side push

The use of variable pitch propeller makes it easy to dock without the help of tugboat. Usually include: motor (bulk carrier) or oil motor (chemical carrier), variable-distance pump set and gravity oil pump.