The marine mooring bollard is a post used on ship’s deck or quay. It is a simple and cost-effective way to fulfill mooring requirements and safely secure vessels alongside jetties, berths, wharves and dolphins in ports and harbors. It is welded by qualified steel tubes with plates. Different types and sizes of the bollards are for sale at YSmarines with best price, which including the single cruciform bollard, double cruciform one, NS2584 type one, DIN 82607 one, ISO13795 one, ISO13797 cruciform one, JIS F-2001 one, GOST11265-73 double cruciform one, dock bollard and other customized type bollard according to the requirement of clients.

T Head Type (Tee Head Type) Dock Bollard

T Head bollard also can be called Tee-head dock bollard. The upon the side of the dock bollard is T head type, which can be different models according to the design of the dock. Tee bollard can cover a vast range of mooring line capacity requirements from small recreational jetties to the largest bulk handling terminals with applications up to 200 tons. It is used in various shipyards, docks and marine applications. It is Suitable for steeper rope angles and is ideal for multi-purpose berths.

Staghorn Bollard(Twin Horn Dock Bollard)

Staghorn bollard also called twin horn dock bollard or double horn bollard is a staghorn shaped type dock mooring bollard. It is commonly used to guarantee the security of marine vessels by mooring ropes. The bollard is supplied with different anchor systems: anchor rods with end-plates and nut fixing for new concrete, anchor rods with epoxy grout and nut fixing for existing concrete and cast-in anchor systems with break-off bolts. It can handle higher line load angles than Single Bitt and Kidney Shaped bollards. This feature may be of particular importance where very large changes in water level result in significant differences in inline angles. Ysmarines is a leading China manufacture for staghorn bollard.

Kidney Dock Bollard

Kidney shaped bollard is one of the most common bollards for jetty, quay and wharf and is suitable when low to the medium tidal range is expected. The dock bollard provides an economical solution for installations where securing mooring lines at high angles. It is particularly suitable for applications where tidal ranges are small and are suited to warping operations along with berths where vessels need to be re-positioned for loading purposes. The kidney dock bollards are available made from the following materials: grey cast iron, ductile cast iron (spheroidal graphite), and cast steel according to the requirement of the dock. It can withstand use in harsh environments.

NS2584 Double Bitt Bollard

The double bitt bollard is made according to the standard of NS2584. The material of the mooring bollard is steel tubes or steel plates. The surface of the bollards should be polished and painted according to Norsk Standard Requirements. It can be fitted with a warping roller if required and also can be deck or quayside mounted. It is suitable for wire or rope with breaking load when cross belayed on the bollard, widely used for small boats.

JIS F 2001-1995 Double Bitt Bollard

The double bitt bollard is made from durable ductile cast iron or cast steel according to the standard of JIS 2001-1995. The surface of the bollard should be without any visible flaws or imperfections. It can withstand use in harsh environments. It is capable of accepting multiple mooring lines due to their twin horn profile and has been designed with a narrow base footprint to fit into spaces on wharves that have limited work area.

ISO13797 Cruciform Bollard

The posts of the cruciform bollard shall be constructed from steel tubes or formed from steel plates according to the standard of ISO13797. And all surfaces of double cruciform bollard with the ropes shall be free from surface roughness or irregularities likely to cause damage to the ropes by abrasion. It shall be coated externally with an anti-corrosion protective finish. Depending on the manufacturing method of the material, ISO13797 cruciform bollards shall be classified as two types, Type A – manufactured by steel tubes ad Type B – manufactured by steel plates. The cruciform bollards are designed and manufactured to our customer’s precise requirements and provided with material certification.

GOST11265-73 Double Cruciform Bollard

The Gost11265-73 double cruciform bollard is made of cast iron or cast steel according to the Russian Standard’s requirements. It is also called cross bollard or cross bitts. It shall also be approved by the RMRS.It is a kind of fairlead fittings to lead the mooring rope or towing rope for ships from inboard to outboard. The polished, galvanized surface of the bollard makes the rope get less abrasion.

DIN82607 Double Bitt Bollard

The DIN 82607 double bitt mooring bollard is welded by steel plate according to the requirement of DIN 8570. The plates and post tubes are weldable steel plates, having a yield point of not less than 235N/mm2. The eye plate for tying the stopping-off rope or chain shall be provided for the DIN82607 bollard. It is a type of ship’s mooring and towing fitting installed on the board to belay the mooring and towing rope.

Curved Dock Bollard

Curved dock bollard is one of the most widely used types of mooring bollards. The upon the side of the bollard is also T head type (or Tee head type), which is similar to the Tee head bollard. If you have special requirements for the bollard, we can produce the products according to your drawings. It provides a simple and cost-effective way to fulfill mooring requirements and safely secure vessels alongside jetties, berths, wharves and dolphins in ports and harbors.

ISO13795 Welded Steel Marine Bollard

The welded steel bollard is a double bitt bollard according to the standard of ISO13795, suitable for installation on sea-going vessels to meet normal mooring and towing requirements. The posts of the bollards shall be constructed from steel tubes or formed from the plate. A low-friction surface coating is not recommended so as to increase the holding force of the mooring rope under figure-of-eight belay according to ISO standard. Depending on the construction, the bollards shall be classified as two types, which are Type A – with compact base plate and Type B – with a wide base plate.

The mooring bollards supplied by YSmarines marine equipment has a compact high strength bollard system, anchoring system, best price guaranteed and good after-sale service.

The purpose of steel rolling production line is to obtain the required shape, such as steel plates, strip steel, wire rods and various sections, another aspect, in order to improve the internal quality of steel like common automotive plates, bridge steel, boiler steel, pipeline steel, etc. Steel rolling is a continuous and uninterrupted operation. The steel strip runs fast on the roller table with automated equipment bringing high efficiency. Depending on the different temperatures in the rolling method, the steel rolling can be classified into hot rolling and cold rolling. According to the different relationships between the relative movement of the rolling stock and the roll during rolling, it can be divided into vertical rolling, horizontal rolling, and diagonal rolling. In the hot rolling production line, the billet is heated to become soft and is sent into the rolling mill by the roller table, finally rolled to the size required by the users. Compared with hot rolling, the processing line in a cold rolling mill is more scattered. The steel coils sent by the hot rolling mill must undergo three consecutive technical treatments and the oxide film must be removed with hydrochloric acid. Through the cold rolling mill, the uncoiler opens the steel coil and then the steel strip is carried to a five-stand continuous rolling mill to be rolled into a thin strip coil.

50K-300K Ton Bar Production Line

The steel bar production line with the annual capacity of 50K to 300K tons for the production of bars Φ8-32mm of common carbon steel, wire rod steel and low-alloy steel. The production Line uses 100×100–150×150 continuous casting billet, which of length 3000mm–6000mm and provided by the internal steelmaking continuous casting workshop. The annual output of 50,000-300,000 tons requires 330,000 tons of continuous casting billet, and the comprehensive finished product rate is 98% (considering negative deviation). It applies regenerative pusher type reheating furnace of gas fuel, the heating capacity is 40-80t/h. There are sixteen rolling mills divided into three group rolling mills of rough rolling, medium rolling and finishing rolling. The layout type is 6+6+4 H-V rolling mills and their main transmission adopts PLC control.

Φ8~32 Rebar Steel Bar Prodcution Line

The steel rebar production line is used for the production of Φ8-Φ32mm round bar, low-alloy steel and carbon structural steel. It is composed of heating furnace, continuous Rolling mills and cooling bed. The auxiliary equipment includes pinch roller, swinging head scissors, chain type cooling bed, 100 hydraulic metal cutting machine and rolling table. The rebar production line is for sale at TINVO with powerful working team and technology support, best metallurgical design institute and lifelong after-sales & maintenance support.

50K-300K Ton Wire Production Line

The wire production line has the annual production capacity of 50K to 300K tons and can produce welding rod steel, Φ5.5-Φ20mm round bar, bearing steel, etc. The whole line adopts full continuous twistless rolling, and the finishing mill adopts high-precision cantilever rolling mill with high rolling speed, high output, high product precision and high mechanical performance. The main equipment includes rough rolling, pre-finishing rolling mill, finishing mill which is a cantilever type twistless high-speed heavy duty rolling mill, pinch roller, wire laying machine, flying shears, water cooling system, transmission and automation.

The forged steel work roll is solid-forged roll made of alloyed steel, close to eutectoid and hypereutectoid steel. It has a good combination with hardened surface which creates a strengthened working layer, heat check and tough core resistance to breakage. Heat treatment reduces and equalizes residual internal stress.

Feature

High Hardness

The high hardness and great depth of hardness are needed for cold reduction mills.

Increased Heat Resistance

With the strong heat resistance, the roll can be capable of retain high hardness with the roll under continuous and constant heating rate.

No Metallurgical Flaws

High Resistance

It is also can ideal hardness and high resistance to spalling, surface flaws, cracks, scaling,etc.

No Microstructure Flaws

The surface microstructure consists of fine grain martensite and finely dispersed chromium carbides.

Application

Tandem mills

Reversing cold rolling mills

Temper mills

Forged Steel Work Rolls Used In Rolling Mills

Hot Rolling Mill

The forged steel work rolls can be used for hot plate mill and these rolls have the features of rich in alignment, high toughness and strong wear ability. They are made of forges steel blanks and can withstand the special heat treatment for excellent hardness.

Cold Rolling Mill

The work roll can be used for cold rolling mill. The forged rolls are produced by steel-making, refining and forging. A homogenous highly dispersed structure provides mechanical properties of the internal layer for complicated heat treatment. It becomes easier for exceptional performance by using the forged rolls which are applied in cold rolling mill.

Forged steel roll is an important mill roll with its outstanding working performance. It can be used as work roll, back up roll and intermediate roll with its high hardness, superior yield strength and high resistance to spalling, fatigue, scaling, etc.

Fire Pump

In the event of a power failure in a fire accident, the fire-fighting unit needs to be able to start normally and drive the water pump to extinguish the fire. The requirements for the reliability of the diesel engines are very high. If for some reason, the diesel engine cannot start successfully, the mechanical starter is required as a backup solution to ensure the engine starting.

Emergency

Most of the emergency rescue is mobile, generally in the state of warehouse storage, relatively lack of battery maintenance. Usually meet the failure to start an engine. It is difficult to find backup battery power under the emergency situation. At this time, the mechanical starter can be used to manually start the engine for the rescue problem.

Marine

When the marine ships meet the situation of power off, the emergency generating set is used to generate power for the ship. Mechanical starter is an ideal choice as the backup device for the emergency engine start.

Military

Under the conditions of field military training, the environment is hard and harsh, and the backup is always insufficient. When the battery is out of power, the important military equipment can’t work normally, which may cause serious consequences. The mechanical start device will solve the problem and can ensure the engine starting by manual system without any other external energy.

Special Environments

There’s always no electricity or the power is low under the environments includes mining, offshore gas and some special chemical plants. The engine starter with mechanical starting system will effectively work under these special environments.

Backup Of Other Engine Starters

The mechanical start system can be used as the back up and replacement of other engine starting system, applicable installing on the diesel generator sets of land and marine, mining machinery, engineering machinery and agricultural irrigation and drainage machinery.

Trustworthy Mechanical Starter – Dalin Spring Starter

Introduction

Dalin mechanical spring starter is a mechanical device which can compress and energize the high energy springs and release the potential spring energy to start the diesel engine, which is produced by Chongqing Starting Power Unit Co., Ltd. The company was established in 2008 and has years of experiences engaging in researching and manufacturing mechanical spring start motor with professional R & D team leading by senior engineer. The Dalin mechanical starter is strictly tested with detailed test bench data including torque, energy, peak, speed, etc will be provided.

Contact Information

Sales : Julie He(Ms.),

Tel/Whatsapp/Wechat: +86-13637706003

Email: sales1@cqstart.com

Marketing : Harland Wang(Mr.)

Email：sundayritian@cqstart.com

Mill rolls are essential in the metal working industry. They are manufactured to an optimum hardness to resist wear and prevent marking. Forged steel roll is a type of rolling mill rolls. The roll has a microstructure which allows the surface finish to be resistant to thermal shock and a hardness depth prevent from rehardening in subsequent applications.

Firstly, we give some basic knowledge about the forged steel roll including the definition, types, feature, chemical composition, etc.

What Are Forged Steel Roll

Forge steel roll provides a mill roller solution for rolling mill. It is one of the most wear parts during the rolling process. It is mainly made of forged steel. It is forged in hydraulic presses for high toughness and pureness, widely used in cold rolling mill, steckel mills and continuous hot strip mills. As different rolling mills have specific requirements and various rolling conditions, different alloy elements can be added into the steel for higher performance of the roll. The roll covers forged steel work roll or intermediate roll, forged steel back up roll.

Forged Steel Roll

Definition

The forged steel rolls are made from steel ingots by forging, which can solve metallurgical defects such as loose and shrinkage holes in the ingot, and crush the coarse cast structure to obtain superior quality roll with high resistance.

The production process includes smelting, ingot casting, forging, post-forging heat treatment, rough processing, final heat treatment and finishing.

Feature

High Toughness

Surface Hardness Uniformity

Fatigue Resistance

High Hardness And Durability

Application

It is mainly used as strip rolling mill working roll and backup roll and is a high speed roll (HSS roll) for tandem and reversing cold reduction mills.

Forged Steel Back Up Roll

Definition

The forged back up roll is a mill roll that supports the work roll and intermediate roll for the purpose of avoiding deflection of the work roll and affecting on the yield and quality of the plate and strip rolling mill. This is the key function of back up roll to ensure the operation of the whole rolling mill. The common materials are 9Cr2Mo, 86CrMoV7, 70Cr3Mo with 0.80% to 0.95% carbon content 2% Cr content. The diameter of roll body ranges from 350mm-1600mm.

Feature

High Rigidity

The back up roll requires high rigidity to ensure the smallest deformation for supporting work roll.

Good Fatigue Resistance And High Peeling Resistance

The backup roll always need to support work roll or intermediate roll. Overloadig cause the subcutaneous miccrocrack propagation and roll body peeling off. So the excellent fatigue resistance is necessary.

High Surface Hardness With Good Hardness Uniformity

Outstanding surface hardness ensures the exceptional wear resistance and can reduce the formation of concave roll shape.

Excellent Yield Strength And High Toughness

To guarantee the long service life, the deep hardened layer of roll body, good strength and toughness of roll neck and roll body and strong anti-accidents are required.

Application

Forged steel back up roll is applicable for 4-Hi mill, 6-Hi mill, and other some small mill.

Usually electric motors are used to start diesel engines. When meeting the lack of maintenance, no charge of battery, or power is down, the engine will not start normally. When in an emergency occasion, the consequence is serious. Mechanical starter, which is an efficient non-electric engine starting device, can solve the starting problem when the battery is low and can start a diesel engine without electricity, purely depends on the hand crank system for engine start.ing

What’s The Mechanical Starter

The mechanical starter is a device to start the engines without electricity. Electric batteries are one of the most common power sources for engine start. But the batteries always can’t work in the extreme low temperature, damp and harsh environment and the hand crank starter will be the ideal choice. This is the reason why marine, offshore oil, underground mining need a mechanical start device.

Advantages of Mechanical Starter

1.Effective In Extreme Low Temperature

When in a cold weather, cranking an engine is a hard work and takes much more energy with the thickened viscosity of the oil. The engine may not crank fast enough to start. The low temperature will slow down its chemical processes of a battery, which makes the power becomes lower.

The mechanical engine starting system doesn’t require the battery and is a mechanical device which only relies on manpower can start the diesel engine with displacement up to 50L.

2. Independent Startup System

Mechanical engine starter has an independent starting system does not require hydraulic, pneumatic nor electricity and no auxiliary equipment is required.

3. Simple Hand Crank System

Mechanical starter has an important back up solution when everything else fail, an option for hand crank charging. The operation is simple with winding the handle and pushing the release lever, then the starting process being completed. The maintenance is also easy.

4. Environmentally friendly

The mechanical starting system has no energy consumption and no pollution emissions. Used batteries will pollute the environment and the decay of the battery will produce toxic substances

5. Lightweight And Minimizing Space

With simple manual crank system, the mechanical engine starter will not take up much space. It’s lightweight and easy to carry.

The mechanical starter solves the problem that the engine can’t start when the power of battery is low or out of power. It has a simple manual crank system with flexibility and reliability.

1. Carbon Content

The carbon content of hot-rolled steel can be slightly higher than that of cold-rolled steel. The density is the same when there are little differences in the components.

2.Density

The density and composition of hot rolled steel can be checked through looking for various steel to find the specific one. Cold rolled steel has high hardness and relatively has difficult for processing, but it is not easy to deform and has high strength.

3. Production Process

The production process of hot-rolled steel and cold-rolled steel is different. Hot rolling steel is rolled at high temperature and cold rolling steel is processed from hot rolled steel at normal temperature. Generally speaking, cold rolled steel has better strength and hot rolled steel has better ductility.

What Are The Differences Between Hot Rolled Steel And Cold Rolled Steel

1.The Surface

The cold steel plate is cold rolled and the surface has no oxide scale with good quality. The hot steel plate uses hot rolled processing technique with oxide scale on the surface.

2. Toughness & Stretchability

Hot rolled steel has poor toughness and the price is low, while cold rolled steel has good stretchability and toughness, but the price is more expensive

3.Mechanical Properties

The cold rolled steel has much better mechanical properties than hot rolled steel.

4. Formability

Since the surface of cold rolled steel is better than hot rolled one, the forming effect also better than that of hot rolled steel.

5. Torsion resistance

Hot rolled steel has higher free torsional stiffness than cold-rolled steel, so the torsional properties of hot-rolled steel are better.

6. Smoothness

The smoothness of cold rolled steel sheet is better than that of hot rolled sheet.

Overall, cold rolled steel has better performance than hot rolled steel, but cold rolling process will cost more and the cold rolled steel has higher price than that of hot rolled one. People should choose the suitable one according to their needs. No matter what types of the rolling is, the mill rolling process plays an important role in steel making and mill roll is essential for the perfect dimensions.

Maybe different people have different views on hot rolled steel and cold rolled steel. Hope the simplified explanation will help people learn more about the two types of steel or steel plate.

The circumstances for using spring start motor

1. Extreme temperature and damp

Spring starter motor needs only hand cranking and releasing spring energy without other power consumption .Its resistances to damp and extreme temperatures make them ideal for marine applications.

2. Non-electric

Spring starter only requires manpower, no hydraulic, pneumatic or electrical infrastructure required. Don’t need to worry the battery has no charge and can be applicable for the dangerous area with prohibition of electric start.

3. Emergency

Spring starter motor can be used as the most suitable backup starting device with the storage spring energy for the emergency like fire-fighting, rescue, marine emergency, military, etc.

How the spring starter motor works

When needs to start a diesel engine, Pull the winding handle of the starter to make the release mechanism store in the energy for ready use. Wind the handle to turn in the prescribed direction to achieve the required storage energy and push the lever to release potential spring energy. Then the diesel engine can be started.

Two types of spring used for spring starter motor

Disc Springs

The springs are compressed by means of a ball screw

Feature:

simple to use

small space required

long-span life

High output torque

Power Springs

The springs are coil springs which are wound up

Feature:

High number of output revolutions

Compact

About Dalin Spring Starter

Dalin spring starter is manufactured by Chongqing Starting Power Unit Co., Ltd which was established in 2008. The company is specialized in the solutions for emergency of engine start and developed a special mechanical starter-Dalin spring starter, applied to military, fire, marine emergency, telecommunications, etc. It has a professional R & D team leading by senior engineer for superior quality products with advanced technology and rigorous services.

Displacement ranges from 0.5L-38L, which is the world record starting power of spring starter motor.

Single spring starter can start 6 cylinders in-line engine with displacement up to 19L, 16 cylinders V-type engine with displacement up to 30L. 0 group system can start up to 50L.

Spring starter group system can start 6 cylinders with the displacement up to 26L, 12 cylinders start up to 38L

Reliability

All products are tested by the unique spring starting test bench with experiment of more than 3000 starting cycles, ensuring all products have

detailed test data. The spring starter has the long-life span of more than 10 years according to customer’s feedback.

Cost Performance

All parts are made from mature material, produced by qualified heat treatment and machining process. On same power level of the starters, Dalin spring starter costs less than similar competing starter.

Simple and Safety Operation

It’s simple to operate. There’s not any auxiliary equipment to be configured, only adopting mechanical structure. The crank will not fly off or kick back during operation, which guarantee the safety of operation.

Services

Dalin spring starter provides excellent after-sale service with a professional service team，which can solve the problems of customers at any time.

Contact information

Sales : Julie He(Ms.),

Tel/Whatsapp/Wechat: +86-13637706003

Email: sales1@cqstart.com

Marketing : Harland Wang(Mr.)

Email：sundayritian@cqstart.com

Dalin spring starter motor, as a mechanical engine start device, provides a powerful and economical starting option for customers who need a simple device for the backup of their electric engine starter.

Hot rolling and cold rolling are the two main process for the most steel or steel plate making, which have great influences on the structure and properties of the steel. A better rolling mill roll will bring more superior quality steel. Which one is better between the hot rolled steel and cold rolled steel?

Some information about the hot rolled steel and cold rolled steel is introduced.

Hot Rolled Steel

Definition

Hot rolled steel is the finished product through directly processed on the steel mold in the steel furnace with exceptionally high temperatures, rolling with the hot mill roller which can make sure the dimensions of the steel sheet according to the requirements., then coiled and cooling. The main steel rolling type is hot rolling.

Advantages

Compact the steel structure and improve the mechanical properties.

Disadvantages

1.After hot rolling, delamination occurs, when the non-metallic inclusions in the steel are pressed into thin sheet. Delamination greatly deteriorates the tensile properties of the steel.

2. Residual Stress caused by uneven cooling. Residual stress is an internal self-phase equilibrium stress without external force. Hot rolled steel may have negative effects on deformation, stability, fatigue resistance, etc.

Cold Rolled Steel

Definition

The cold rolled steel bar is obtained by cold working of the hot-rolled steel, such as cold drawing and stretching at a normal temperature. Cold rolling is often used for the production of small sections and steel sheets.

Advantages

Cold rolled steel bar has fast forming speed and high output. It can be made into a variety of cross-sectional forms to meet the requirements of the different use conditions. Cold rolling mill can make the steel have a large plastic deformation.

Disadvantages

Torsion is prone to occur under bending. Bending and torsional buckling is easy to occur under compression. So the torsional performance of cold rolled steel is poor, and the ability to withstand concentrated loads is weak.

The engine is the source of all the powers and brings energy to modern society. The engine needs to turn over by the outside power so that it can operate under its own power. Spring starter is a mechanical engine starter can effectively start a diesel engine without external power.

Firstly, we look into

What’s the engine starter

Engine starter is the device for internal combustion engines by offering initial rotation, widely used for diesel engines, aircraft, portable generators, etc.

The types of engine starter

The main Engine starter types include pneumatic starter, hydraulic starter, electric starter, spring starter.

Pneumatic

Pneumatic engine starters also known as air starters are used for diesel engines, gas turbines, and some reciprocating engines. The compressor compresses the air for storage and they rely on the compressed air as energy for starting. They have a high power-to-weight ratio and high speed acceleration.

Hydraulic

Hydraulic engine starters are suitable for marine propulsion engines, diesel engines, and hydraulic fracturing equipment for oil & gas exploration. It is a motor that uses hydraulic energy to drive a diesel flywheel ring gear to achieve the ignition of a diesel engine. It can be used extremely cold weather, offshore and explosion-proof occasions.

Electric

Electric engine starters are the traditional starter motor. They are powered by batteries and electric convert to mechanical energy for start the ring gear on the engine’s flywheel, usually used in cars, ships, construction equipment, etc.

Spring

spring start motors are the mechanical devices which can rotate hand crank energy to mechanical energy through the compressed disc springs for storage, the potential energy in the springs being released by tripping, the starter pinion rotating the engine flywheel ring gear for starting a diesel engine, mostly used in the emergency situations where the reliability is required.