Tell you more about Marine Crane

Marine Crane

Marine crane is ship's heavy deck equipment ,for a long period of use suspender device, but in the 40 years of 20th century has begun in some ship using a crane, after the Second World War to gradually promote the use . at the beginning of the 1960s, with large ships and high speed, more eager to want shorten the time to stop in port and fast speed of loading and unloading of ships, has the advantages of compact structure ,convenient and reliable operation, large lifting capacity crane appear.

advantage

(1) loading and unloading efficiency is high. Because the positioning ability is good, the reduction of cargo in the cargo hold handling, do not have to be like the hanger device to adjust the position of boom to stop work. At the same time crane can take into account the operation of two cabin.

(2) easy to operate. Almost no preparation work before use. Operating personnel in the higher position of driving room operation, broad vision, strong operation.

(3) the deck layout is simple and use deck area is small.

(4) the hoisting large cargo is particularly suitable. Container ship as long as the lifting equipment will be a crane.

shortcoming

(1) Heavy, high center of gravity and large volume, effect the ship's stability and ship's sight

(2) the price is more expensive, the initial investment is high.

(3) large power, high requirements for the ship power station.

(4) the mechanization and automation of the crane is high, and the technical requirement for overhaul is high.

Type of ship crane

There are many type of ship cranes. According to the characteristics of crane loading and unloading of goods, can be configured to grab, container spreader. For the common grab, dynamical grab and dynamic container spreader crane need add support cable winch

Ship crane although due to the type structure, driving mode and the manufacturer's different varieties and different, but no matter what form the crane must meet: the rated lifting speed lift rated load, according to the requirements of operator, convenient and flexible cargo handling; can according to different situation lift like heavy cargo, light cargo, empty hook and goods, in a wide range of regulating speed, and has good acceleration and deceleration characteristics; in landing and unloading process, according to need can be stopped at any time, and hold the heavy cargo.

1.Classification by structure

Rotary crane is the most common form of ship crane, and its structural form has two kinds.

(1) Hanging arm end with luffing that crane cable leading to the upper part of crane tower, and with performance of horizontal luffing means hanging arm luffing, hook position remained horizontal motion. This crane is widely used.

(2) the rotating end of lifting arm is at the top of tower, working radius is changed with the aid of variable amplitude cylinder.

2.According to drive classification

Crane according to the driving mode is divided into two kinds of electric and electro-hydraulic drive.

(1) the efficiency of the electric crane is high, speed correct, operation simple, maintenance few and easy to control. Electric cranes are commonly used in two kinds of generator motor system and silicon controlled control system. The former uses three output modes, respectively to lifting, luffing and slewing motor power supply, with less motor units, small volume and advantage of small capacity, preserving the DC motor start-up, good speed performance characteristics; the latter in handling, efficiency and scale better, this form of great weight electric hoist is gradually being used in large ships. The starting weight of the series is 5~40t, the maximum working radius is 12~36m.

(2) electro-hydraulic drive crane smooth operation, light weight, small volume, stepless speed regulation, with the characteristics of constant power, empty hook high speed and heavy load slow speed, due to the continuous improvement of hydraulic technology. At the same time, electronic control, also retaining advantages of electric crane, so electro-hydraulic driven cranes has been widely adopted.

Hydraulic pump group is used one motor to drive three hydraulic pumps, respectively driven lifting, luffing, rotate motor. High voltage electro hydraulic drive crane is usually used axial plunger type hydraulic pump and hydraulic motor. The transmission mechanism of the winch is a planetary gear, mounted on winch drum with a hydraulic motor, structure is compact. Luffing device 2 forms of hydraulic cylinder and variable amplitude winch.

Medium voltage electric-hydraulic drive crane often adopts vane pump and hydraulic motor or high torque low speed hydraulic motor.

Electro hydraulic crane capacity series for 5~50t, maximum working radius of 32m, full play rise speed generally is about 12m / min and high speed can be more than 20m / min, empty hook speed normally one time of full capacity; rotary speed is generally about 1 R / min and ship floating state with different change; from maximum working radius to the minimum radius of the amplitude time is about 1 minute.

Selection of ship crane

1 the driving form often depends on the choice of owner;

2. The lifting capacity, depends mainly on the loading and unloading of goods species (container ships are usually used 36~40t). At the same time also should consider the cost factor.

3. The span size, usually outboard span should not less than 6m, must also meet the requirements of cabin loading, in addition to considering the boom stalled position;

4.rane’s rotary, luffing and lifting speed etc. These parameters have been marked on the product samples of each manufacturer. Designers can choose according to the requirements of owner.

Arrangement of ship crane

The ship's crane is usually arranged on the center line of the ship's hull. Cargo handling operation both forward and after cabin lifting, this arrangement forward and after two cranes can be combined loading and unloading heavy cargo.

For container ships, the layout is not ideal, because in the crane will affect container stacking. So the development of slender type crane, it accounted for only a box and the minimum radius of work of this kind of crane only 2.4m, even side container pile can be lifted, so the container ship mostly used slender type crane and arranged at the side of the ship. This arrangement can increase the number of containers, and improve the economic efficiency. However, it should pay special attention to the horizontal balance of ship when ship is too small.

Let talk about rubber fender

RubberFender 

Fender is an elastic buffer device of rubber use of ships dock edge. Mainly used to slow the ship and dock impact, or between ships in dock impact, or mooring process impact, to prevent or eliminate damage to a ship or dock Usually the rubber fender according to the structure can be divided into two categories: solidrubber fender and floating type rubber fender.

Solid rubber fender dock ship application long history and wide range of anti-collision equipment. Can be divided according to the rubber fender force to shear, rotation and compression type and so on; according to the fender structure, solid rubber fender can be classified as type D type, Cone type, drum type, fan-shaped, rectangular type, cylinder fender and so on.

Solid rubber fender with high energy absorption and reaction force, and has low cost, long service life, easy installation and maintenance advantages, dock, dock installed more protective device.

Floating type rubber fender is newer protecting shipboard equipment, solid rubber fender relative than its main features are: large compressive deformation energy absorption, low reaction force, since floating, easy installation, etc. and for and. Due to its self-flotation characteristics especially suitable for large changes in the terminal installation in tide

Type of rubber fender: Dock Corner Rubber Fender,ME Rubber Fender,Rectangle Rubber Fender,U Rubber Fender,XT Rubber Fender,Cylinder Rubber Fender,Arc rubber fender,Cone rubber fender,D rubber fender,DD rubber fender,Drum rubber fender,Foam floating rubber fender,GD rubber fender,Pneumatic Inflatable rubber fender,roller rubber fender

1, Transport

1) protect the rubber fender of transport mode is the car.

2) fender in loading and unloading process, to take the correct lifting way shall keep clean, not throw hit, avoid hard hooks, spines, row to do harm fender.

3) The loading goods should packing strong, to ensure that the goods in the whole transport process is not shift, not loose.

4)after the goods to designated site , unloading the equipment with suitable lifting, avoid collision and damage.

2, storage

1) rubber fender protection in storage, should avoid direct sunlight, avoid rain and snow, avoid with acid, alkali, oil ,organic solvents and other substances to come in contact with; from heat source one meter away, inventory temperature maintained at - 15 to 40 degrees.

2)rubber fender storage area need about 400 square meter

Marine Liferaft breif introduce

Marine Life raft

Set on board, when the ship is in distress, it is used as a life raft.

The life raft refers to persons in distress can maintain the life raft from the ship. Life rafts play an important role in survival of ship distress. In some unexpected situations, such as sudden sinking of ship, the life raft can quickly and automatically inflate. In addition, it has the advantages of light weight, small storage size, easy maintenance, good economy and so on.

Ships are equipped with for an emergency out of the danger zone or the wrecked ship emergency evacuation rescue facilities and equipment, but also as flood disaster prevention and special equipment.

Life raft and lifeboat are important survival equipment, and in some ways better than the lifeboat, especially when a ship in distress to produce severe longitudinal tilt and roll, the lifeboat can’t dipping, life raft can still effectively play a role, so in the boat life raft and save boats have equally important status.

type

The raft structure is divided into rigid raft and inflatable raft;

According to the water way into throwing life raft and hanging life raft.

According to use have high speed ship open inflatable liferaft, fishing gear inflatable liferaft, guest rolls boat self righting liferaft or with canopy can reverse floating life raft,.

Structure

Liferaft is a modern craft of artificial synthetic materials, including metal pipe, composite pipe, plastic pipe, synthetic resin or glass fiber pipe and other materials.

The raft bow with cable, it is connection between the raft and fixtures. The life raft in condition of full rated crew and all fittings keep good floating state. liferaft floating tyre should be divided into at least two independent air chambers, floating tyre settings should stretch sitting room was damaged, the life raft can still normal use.

Main technical requirements

1, quality

In addition to hanging raft, raft and other containers and fittings total weight not more than 185kg.

2, stability

All kinds of life rafts should be stable when used in the sea waves; the floating in the static water should be able to withstand the pressure of a person, and at least to withstand the towing speed of 3kn.

3, strength

At least able to withstand the towing speed of 3kn, from 18m height dropped not damaged. Floating, able to withstand the bail out of repeated tic 4.5m height; hanging type liferaft full, raft hull should be able to withstand not less than 3.5m/s speed of lateral collision and under 4 times full load intensity.

1983 amendments to the Convention, an increase of inflatable liferaft inflatable molding time requirements, under normal temperature (range from 18 to 20 DEG C) should be within 1 minute fully inflated; at low temperature (- 30 DEG C) should be within 3min inflation.

Using method

The total weight of life raft should not exceed 185kg. Appearance should be symmetrical, uniform color, shall not affect the use of glue, separation, bubbles and other defects, in - 10 ~ +65 C ambient storage without damage; and can be used in - 1 + 30 DEG C water temperature range.

Liferaft usually packaging and storage in glass steel storage barrel, life raft is installed in ship special on raft frame, the raft and thrown into water, life raft can automatically inflated forming for the distress personnel to take, if the ship is sinking too fast too late to raft tossed into the water. When the ship sank in water under a certain depth and liferaft rack hydrostatic release automatically decouple, releasing life raft.

General requirements for life raft

1, construct of life raft, it can withstand exposure in all conditions to float up to 30 days;

2. The structure of life raft should be put into the water from the height of 18m, and the use of it can be satisfied;

3, under the roof support and without support, the floating raft can stand from the bottom of raft above at least 4.5m height repeated jumping board;

4, when the life raft load foot all occupants and is down and a sea anchor and liferaft should be in the calm water to 3 kn speed to be towed.

5, the life raft with protect occupants from exposure canopy. The canopy automatically support after raft landing and to surface of water, and rainwater collection facilities;

6, liferaft should be set 1 bow cable, its length should be not less than from the storage to the lightest seagoing waterline distance of 2 times or 15m, whichever is the greater.

7, each life raft should be equipped with requirement fittings;

8, the life raft should also set free floating device.

The storage of life raft should be able to manual release when the raft is free from securing device. Each liferaft storage shall be provided free floating device, so that each life raft free floating, and if is inflatable when sinking ship can automatically inflate. There should be no deck covering above the storage place of life raft, so as to avoid the free float of life raft when ship is sinking.

Unless certain transfer facilities are set up, the life raft should be kept in the range of hook, and the arrangement should enable all passengers to board raft quickly.

For throwing outboard landing raft storage, should be able to easily transfer to ship any shipboard landing, otherwise it should increase the total capacity per port for use in accordance with the provisions.

Marine Lifeboat and rescue boat

Marine lifeboat/ Marine Resuce Boat

lifeboat is small boat to maintain personnel when ship sinking . The ship is provided, mainly used in ship distress, for ship personnel aboard self rescue boat.

Lifeboats on board main rescue tools, it is ship crew used for self-help or rescue persons in distress at sea special rescue boat. In the boat seat board below with air box, in order to ensure that the boat is fully filled with water will not sink. The boat equipped with propulsion equipment , food, drinking water, emergency medicine, equipment, communication equipment and sail, oar, pole and so on, some also equipped with motor propulsion device. The length is not less than 5m. Using propeller, sail or propeller to promote. The International Convention for the safety of life at sea and the marine life-saving equipment specifications, the lifeboat equipped, strength, floating, steady and sedimentation have strict regulations. At the same time, also request passenger ships all lifeboats must be landed in water in 30 minutes under normal weather conditions. Ship even in adverse longitudinal tilt or any shipboard heeling 15 degrees can also landed safely; lifeboat arrange should not interfere with the operation of other life-saving equipment use, all boats in case of emergency immediately available. Lifeboat bow indicate the name, tail indicates the port of registry. The lifeboat usually set in the lifeboat deck hanging device, in order to facilitate personnel embarkation and quickly put to the surface.

Lifeboat has good buoyancy, stability and navigation performance, compared with other life-saving tools have greater safety, but its quality is better, occupy deck area and space is larger.

Classification of lifeboat

1, according to the hull material classification

According to the hull material can be divided into wooden lifeboats, metal (steel or aluminum) lifeboats and lifeboat glass steel.

The fire resistance of steel lifeboat is good, but it is easy to rust. The tanker used steel open lifeboat, the standard tankers must adopt totally closed fire resistant lifeboat. At present, the steel boat is seldom used.

The glass fiber reinforced plastic lifeboat has the advantages of light weight, high strength, corrosion resistance, smooth surface, simple manufacture and maintenance, convenient maintenance and high durability, and is widely used at home and abroad.

2, according to the promotion of classification

According to the propulsion mode can be divided into motor lifeboat and non-motor lifeboat. Motor lifeboat use diesel engine as a driving force can full crew quickly evacuated ship insurance, but also can towing non-motorized boats and rafts. Non motor lifeboat rely on paddling, or a hand, foot and other human propulsion device, or use sail propulsion. "SOLAS Convention" on the new ship all the lifeboats are required be motor lifeboat. Therefore, the current non-motor lifeboat can only be used for domestic ships and inland ships.

International voyage ships and sailing on domestic passenger ships and oil tankers are equipped with motor lifeboat, when the carrier foot all occupants and fittings, auxiliary device driven by the engine are in operation and in hydrostatic speed should be not less than 6kn, when towing a load full occupants and fittings a 25 man life raft, speed should be not less than 2Kn. in hydrostatic speed should be not less than 4kn.

3, according to the structure of the form of classification

According to the structure can be divided into open lifeboat (crew set in more than 60 people should motor lifeboat), half enclosed lifeboat and fully enclosed lifeboat. Fully enclosed lifeboat according to different equipment and function can be divided into ordinary lifeboat, fire resistant lifeboat, with air support system lifeboat and free fall lifeboat. All the crew of lifeboat shall not be more than 150.

Select of lifeboat

1, cargo ship

When the ship sets two fully enclosed lifeboats, usually on starboard lifeboat as a rescue boat, Fully enclosed lifeboat selection side open door or stern open door based on the layout of vessel wall. If the ship by free fall lifeboat, can’t be used as a rescue boat. Therefore, it is necessary to separately equipped with a rescue boat.

2, passenger ship

Full enclosed lifeboat is expensive, so the passenger ship generally used half enclosed lifeboat. But the passenger does not allow free fall lifeboat. The passenger ship half or fully enclosed lifeboats meet the requirements can be used as a rescue boat. There is at least one fast rescue boat in the rescue boat.

Storage and arrangement of lifeboat

Life raft should be kept as close to the living and serving place as possible. The landing station location lifeboat should as possible to make the lifeboat raft launching straight into water. If the landing site is located at bow of ship, it shall be set up in a sheltered place after the collision bulkhead. The ship landed lifeboat should be stored and are arranged to propellers as far away as possible. Where the vessel is 80m and above, but is less than 120m, the lifeboat shall be stored in a place not less than the length of lifeboat. Vessel length 120m and above of freighters and 80m and above passenger ship, the lifeboat should be stored to propeller not less than 1.5 times the length of lifeboat.

General requirements for lifeboat

1, Life boats shape and scale should make it have sufficient stability in waves, and has sufficient freeboard load full occupants and fittings. All boats should have rigid hull, can keep positive stability.

2, Lifeboats should have sufficient strength, full passenger although with crumbs articles can safely landed in water, When the ship in calm water to 5 kn speed forward, landing in the water and be towed.

3, the number of lifeboat can’t be more than 150 people.

4, the layout of lifeboat, should enable all its crew to board boat quickly.

5, the lifeboat should have the inherent buoyancy material.

6, when 50% occupants to normal posture sitting in on one side of the center line of boat, the lifeboat freeboard shall be at least 1.5% length of lifeboat or 100 mm, whichever is the greater.

7, Lifeboat should be prolonged obviously handwriting indicate the scale and the crew fixed; lifeboats subordinate name of ship and ship's port of registry shall be to bold Roman letters to mark the bow boat on both sides; symbol of recognize the lifeboat subordinate ship and lifeboat number, can see it from the sky.

Do you know about marine life-sawing equipment ?

Marine Life-sawing Equipment

Definition

1, Ship specialized equipment and accessories for rescue or salvage collectively when in danger.

2, On ship can be configured separately in the sea of floating or running a variety of life-saving tools. Commonly used lifesaving equipment with a lifeboat, life raft, life cycle and life jackets, etc.. The International Convention for the safety of life at sea has specific requirements for life saving equipment.

Summary

Marine life-saving work should include the preparation, embarkation, survival, signal and communication, search and rescue etc six aspects, only every work to meet the corresponding equipment of marine life, and each set of equipment are in line with the technical requirements, make a complete rescue system. In order to ensure the life to realize the purpose. Ship life-saving equipment is important measures to protect the life and safety of personnel on board.The performance of sea rescue and rescue equipment must comply with the relevant conventions, norms and requirements of the agreement. In 1983, the international maritime organization by the SOLAS Convention and develop as a transitional requirements of marine life-saving equipment specification and technical performance of ship lifesaving equipment, equipped with a variety of rescue equipment, various rescue equipment are clearly defined.

Composition of life saving equipment

Ship life-saving appliances including rescue boats, lifeboats, life rafts, life floating, personal survival equipment, missile throwing apparatus, communication equipment, smoke signal light , liferaft embarkation and landing gear.

Rescue boat is maritime rescue command craft and emergency lifeboat. It has fast enough, good mobility and manipulation, can quickly to rescue the drowning person, aggregation and towing full load occupant.

Lifeboat and life raft is a life - saving vehicle which is capable of not only to evacuate passengers, but also to allow passengers to be not immersed in sea water.

Lifebuoy can support personnel in distress in life-saving appliances floating in the water, and generally refers to a lifebuoy and lifejacket.

Personal life saving equipment can support a single person floating in the water of life appliances, generally refers to the life buoy, life jacket, warm life jacket, anti-immersion suit and thermal insulation bag.

Polishing equipment is refers to the life-saving appliances ejection to a certain distance to rescue drowning the catapult and projectile cable accurately ejection to the desired position. To help build contact with vessel in distress ,rescue ship or shore.

The smoke signal is used to display the location of person in distress, so that it is easy to be found in the daytime or at night. Mainly has the self-bright floating light, the hand flame signal, the parachute signal and so on.

Lifeboat equipment requirements is very high, the general principle is: in an emergency can immediately use. Under the harsh climate and working conditions can use safe, should make the person in distress sea for a long time to sustain life; easy to find by rescue personnel and rescue.

The following factors shall be taken into account in the arrangement of life saving equipment.

1, the lifeboat should be reasonable placement, in order to ensure that emergency situations can be safely and quickly discharged. Should be close to the living and service premises, so that operator and staff of the collection board. In the length direction should be as close as possible to the middle of a ship ,from the bow should be at least 1 / 3 of captain, so as not to affect the driving room line of sight or hinder mooring operations. In addition to the free throw fall lifeboat, general lifeboat should be away from the propeller and stern protruding parts, so as to avoid the water landing by stern flow. In the beam direction should be as close to the ship without prominent outboard. In the height direction is best placed in same layer of deck. If boat is divided into several layers, it should be able to put the boat at same time without interfering with each other. The boat from waterline have a certain height, to avoid the drain or take corresponding measures.

2, rescue boats or emergency lifeboat should be located near cab to facilitate the landing and recovery of premises.

3, the life raft should be stored in an emergency place can immediately take. The hanging type life raft should be arranged in the vicinity of suspended raft.

4, the survival of floating buoy should be stored in the place can quickly drop off.

5, the buoy should be kept accessible in the two sides of ship's personnel premises, at least 1 placed bow and stern. Life buoy should be kept on both sides of the cab with the self - bright floating light and the spontaneous smoke signal. Life rings shall not be permanently fixed, and shall be easy to use at any time.

6, life jacket should be stored in the staff stay or easy to reach place. The use of life jackets on duty should be kept in the vicinity of duty office.

7, the rope and smoke signal should be placed in the cab room or near, and can quickly take.

8, Davit should ensure boat, raft in a certain aspect rolling of ship and a certain speed can be safely and quickly landed.

9, the lifeboat and rescue boat and life raft embarkation ladder location must be set.

10, lifeboat, rescue boat and life raft should be set up static release device.

General requirements for life-saving equipment

1, the air temperature within the -30 to +65 DEG C during storage without damage;

2, -1 to +30 degrees in the sea water, should be able to fully use;

3, should prevent decay, corrosion resistance, is not affected by sea water, oil or fungal invasion of the excessive impact;

4, such as exposure to sunlight, should be able to resist aging;

5, in all help to detect location of color easy to see;

6, in the help to detect location of install reverse reflective material;

7, if must be used in the wind and waves, should be able to work satisfied.

In view of life saving equipment is an important aspect of ship's safe operation, regulations on the ship should be equipped with a variety of life-saving equipment , as well as their layout and performance has made a clear provision. Like the international sailing ship legal checking technical rules "on international sailing ship survival craft equipped with requirements on each side at least should be equipped with 1 set full enclosed lifeboats. Port and starboard lifeboats total capacity should be able to accommodate the total number of persons on board. At the same time, also equipped with one or more inflatable or rigid life raft, to be placed in a single open deck where convenience port to port transfer, and its total capacity to accommodate equal total number of persons on board. If the raft is not stored in the above position, then the total capacity available on each side shall be sufficient to accommodate the total number of persons on board.

Mooring Rope work with Mooring Winch

Mooring Rope

According to the strength, elasticity, durability and operation to choose the most suitable materials. That large ships use wire ropes, and in the small and medium-sized ships to give priority to the use of synthetic fiber rope. All the mooring line as far as possible to choose the same size and material .Multiple strands mooring rope used to tie ships. Requires the tensile strength, impact resistance, abrasion resistance, flexibility, light. With 3 strands rope, 6 strands rope, 8 strands rope, 12 strands rope, double layer multi ply braided rope

In the past commonly used steel wire rope, hemp or cotton rope; after the emergence of synthetic fiber, has been mostly used for nylon, polypropylene, polyvinyl alcohol, polyester and manufacture. Synthetic fiber rope in light specific gravity, high strength, impact resistance and good abrasion resistance outside, corrosion resistance, mildew resistance, resistance to insects and other advantages. Chemical fiber cable according to the processing structure is divided into 3 stands, 8 stands , twisted rope and multi strands plaited rope . 3 stands rope diameter is 4 ~ 50 mm, 8 stands of general cable diameter is 35 ~ 120 mm. According to the needs of special purpose, it can be incorporated into the metal materials in the cable core.

Nylon rope :

High strength, light weight, soft, high elastic, long-term use is not easy to fatigue. The characteristics of strong wear resistance, chemical resistance, oil chemical reaction does not occur. Have  water absorbent, weather resistant ability is poor, too long exposure performance will decline. After the friction is easy to produce electrostatic and adsorption of dust

Polyester rope:

High strength, high temperature resistance and the resistance to climate, suitable for high load continuous friction, Acid resistance, alkali resistance and oil resistance, so used for towing. Water absorption rate is only 0.4%,.

Polypropylene rope:

Soft, low water absorption rate, High oil and chemical corrosion resistance, Not easy to absorb dust, dirt. Friction resistance, not easy to slide in the roller and bollard, in the case of repeated curl, has little influence on the strength. Convenient operation, small elongation, small rebound. Poor heat resistance, temperature: 140 degrees - -30.The polypropylene rope breaking force for nylon rope breaking force 51%-66% is a large ship equipped with cable

Polyethylene rope:

Low temperature resistance, chemical resistance, chemical corrosion resistance,. No absorb water that can floating on the water, keeping the various properties in water, suitable for water application. Poor high temperature resistance .still has enough strength at low temperature, soft and easy to operate

Vigny long rope:

Wear resistant, low temperature resistant, salt and oil resistant. Ultraviolet resistance, aging is not easy. High temperature, burning 230 degrees. Poor elasticity, when high temperature or elongated deformation.. High water absorbent

Dyneema rope

light weight, floating in the water, light 87.5%. the same diameter of the steel wire rope the world's highest strength, 1.5 times higher he steel wire rope of the same diameter. -excellent durability, water resistance, chemical resistance, ultraviolet radiation and temperature is repeated, using the constant quality. operation convenient, fast, safe to use, the operation is a short period of time, such as the military in particular situations, maneuver rapid capability. Super low temperature resistance (liquid helium temperature 269 DEG C, it is still able to maintain useful resistance to impact, toughness and ductility and fracture)Low density, light weight (less dense than water, <1 g/cm3). Water absorption is very low. Physiologically inert (most level can be used in contact with food) with FDA certification. Moderate mechanical strength, rigidity, good creep resistance and excellent machining performance. Superior corrosion resistance, resistance to chemicals

Mooring Winch / Marine Winch

Mooring Winch / Marine Winch 

Definition

1, Ship Deck Machine to twist the rope.

2, winch to maintain and twist the rope in tension, and can store the rope also called mooring winch.

Brief introduction

Winch or mooring winch, mainly used to twist the rope. Bow mooring machinery is performed by windlass drum, some large ship at the bow designed special mooring winch; middle ship rope by cargo winch drum twist, some large ships also dedicated mooring winch; on the stern deck is another mooring winch or mooring capstan.

Winch has vertical or horizontal. Vertical winch called capstan. According to the power different divided steam winch, electric winch and hydraulic winch.

Type

According to the power source, electric winch and hydraulic winch, steam winch used on some tanker. According to the axial direction of drum, can be divided into horizontal and vertical cable winch.

Horizontal winch

General horizontal winch drum is driven by the motor after drive operation, the deck occupies a larger area.

Vertical winch

Vertical winch, also known as mooring capstan, because of the power device is generally located in below deck, so a small area occupied of deck and conducive to protect machine.

Automatic tension mooring winch

Automatic tension winch full automatic tension adjustment winch. At present, many large ships have been installed automatic mooring. The power source of the automatic mooring winch is electric and hydraulic. The basic principle is winch drum applied a adjustable torque, in order to maintain a balance of mooring line tension caused by vessel moment. When ship due to change of draft or by tides, wind effects, leading to the mooring rope tension decreased to deviate from the prescribed value, automatic winch can accordingly automatic retractable cable, to stable tension to the specified value. In this way, can prevent the cable break, ensure mooring safety, and reduce the labor intensity and operating personnel on duty.

When the cable relaxation and tension decreases, it can automatically control pressure regulating valve action pressure valve closure, high pressure oil pump discharge high pressure oil into the hydraulic motor, drive shaft and drum along the clockwise rotation, the relaxation cable wrung.

When the tension reaches the original value, the pressure valve is automatically opened, most of the pressure oil flow into the tank, small amount of oil into the hydraulic motor to add the amount of leakage oil, so that the drum stops rotating. When the mooring tension is greater than the hydraulic fluid brake force, mooring will boost motor reversing loose cable.

The hydraulic motor is inverted and is mixed with the oil liquid discharged from the high pressure liquid pump, and the pressure regulating valve is a low pressure liquid circulation. The automatic mooring machine must have the corresponding rotating guide device (universal cable guide fairlead).

Because the automatic winch must roll mooring cable on the winch drum, a limited number of. General cargo is usually only two bow rope and two stern rope can be automatically retracted, can only satisfy the general situation. And when the ship's draft great changes or due to tidal and wind the cable tension variation is large, still need artificial timely adjustment of all cables. According to the requirements of IMO, the oil tanker parked, the automatic tension winch should be placed in the "un-automatic" working status.

Installation requirements and inspection methods for winch

Winch device have windlass assemble mooring device device and crane assemble mooring device, the installation of such units to install corresponding windlass, winch. Special mooring device installation, mooring winch frame should be according to the pattern size on the deck erection and welding, welding specifications should be consistent with the pattern, without such as weld cracks, leakage welding, welding slag, arc pit defects. The base pad (including lateral base) surface processing after welding should be carried out, outward tilt is less than 1: 100 requirements.