Author Archives: Camille F.

What is Super Bright LED Light?

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If you are planning to buy a quality LED flashlight, you should make sure that it would be able to provide good and clear lighting. There are many flashlight manufacturers in the market, who are providing super bright LED lights, which can be used in dark areas. These LED are capable of lighting up to 300 meters. This is a marvelous discovery of the new and advanced technology. Even though LED was in the market from many years, most of the people did not know the real benefits of it. As people started using it for different purposes, LED manufacturers started producing more advanced and powerful LED lights.

 

However, installing LED to cars has become a new trend today. Most of the people who look for an option to modify their cars and other vehicles use LED bulbs. Even though most of the people use the ordinary LED bulbs, few opt for super bright LED light, which will provide them more power beams than the ordinary ones. These LED come out with four output levels; therefore, you have an option to set it to low, medium, high or with turbo.

 

If you research on the web or visit your nearby store, you will be able to find different types of super bright LED light series, which are obtainable in different colors. Apart from the car modification, LED is also used for many industrial purposes. These bulbs can be also fixed for bikes with the help of a LED kit. Finding the right accessories for your vehicle is very important as it might enhance your driving experience.

 

DAINA is the professional LED manufacturer in Taiwan. We provide a variety of high quality LED lights such as super bright LED lights, oval LED, rectangular LED, multi-color LED and so on products for customers. Learn more information about LED lights, welcome to visit our website and feel free to contact DAINA.

 

 

Article Source: http://EzineArticles.com/3710498

What Are the Different Types of Metal-working Machinery?

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Metal-working machinery includes a wide variety of equipment used to cut and shape metal. These machines offer an alternative to shaping these metals by hand, resulting in greater precision and higher production levels. They can be found in many metalworking shops, manufacturing and industrial facilities throughout the world, as well as in the homes of hobbyists. Metalworking machines come in many forms, including lathes, milling machines, and planers. This equipment also includes basic tools used to modify the surface or finish of metal, including grinders, polishing equipment, and embossing machines.

 

Lathes are one of the most widely used types of metal-working machinery. These devices rotate a metal object around a spindle. As it rotates, tools and cutting bits shape or cut the metal into the desired form. These machines can range from small desk-top units to large floor models. While some may be manually operated, most rely on computer programming using computer numerical control (CNC) software.

 

The milling machine can be thought of as a more advanced version of the lathe. This metal-working machinery holds an object in place as the worktable moves around it. Unlike the lathe, milling machines can modify metal across three dimensions, not just two. Micro milling machines can even be used to cut and shape items that are invisible to the naked eye. Like a lathe, milling equipment generally relies on CNC software for precise control and programming.

 

A metal planer can be used to cut or shave metal in a single linear direction. These machines hold the metal object stationary, and then run a cutting blade across the surface to smooth or flatten the material. Planers can also be used to cut slots or other shapes into the face of a product.

 

Metal-working machines can also include equipment used to bend and shape sheet metal. For example, a metal brake creates folds or bends in sheets of steel and other metals. Similar machines are used to stamp or emboss patterns into metal, or to roll it flat. These machines can be either manually operated or controlled using a CNC system depending on where they are used.

 

Extruding and casting equipment are other types of metal-working machinery. In casting, workers make a mold of an object and use it to shape molten metal. Extrusion involves forcing hot metal through a die. The shape of the die determines the shape and profile of the final product.

 

SEHO provides much different second hand metal-working machinery such as CNC grinding machinery etc. machine tools. If you are interested in learning more information about used machinery, welcome to visit our website and feel free to contact with SEHO Industry Co., Ltd.

 

 

Article Source: http://www.wisegeek.com/what-are-the-different-types-of-metalworking-machinery.htm

 

Glass Fibers and Fiberglass Fabrics Information

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Glass fibers and fiberglass fabric consist of bulk, chopped fibers or continuous strands of glass. Glass fibers and fiberglass fabric is used in reinforcing plastics and composites as well as other specialized electrical and thermal applications. Fiberglass cloth is frequently used to reinforce other plastic materials. Glass fiber reinforced plastic (GRP) or glass fiber reinforced epoxy (GRE) are commonly called fiberglass.

 

The glass fiber used to create fiberglass material is made by extruding very thin strands of silica-based monofilament. Glass is a unique amorphous solid, meaning it doesn’t have an underlying crystalline structure in the solid state, but rather behaves like a very viscous liquid. Glass fiber lends itself to woven fabric because the thin fibers can easily bend. Fabric made of glass fibers has high tensile strength, dimensional stability, high heat and fire resistance, as well as resistance to many chemical compounds. Fiberglass fabric is also used to dissipate heat, and has electrical properties that make it useful in electronic components.

 

Applications

Glass fibers and fiberglass fabrics are commonly used in composite construction, including materials used in boat building. Light weight fiberglass cloth is used with a resin to produce a waterproof surface. Heavier woven fiberglass fabric can be used for greater strength and rigidity.

 

Glass fibers and fiberglass fabrics are also used to create combination or specialty fabrics. Glass fibers and fiberglass fabric may be combined with carbon fiber or aramid fibers to make laminates and moldable fabrics for canoes, kayaks, and other high strength, low weight applications.

 

Standards

Glass fibers and fiberglass fabrics must adhere to certain standards and specifications to ensure proper design and functionality.

 

Delphi DX300340 – This specification covers the properties of a Polyamide 6, 40% glass filled, impact resistance modified injection molding grade used for the manufacture of parts that require high stiffness and toughness under extreme conditions (Example: airbag containers).

 

GMW15890 – This specification covers the properties of polypropylene reinforced with long glass fibers. It covers injection molding types for manufacturing of technical parts requiring high structural stiffness.

 

JIS C 6832 – This standard specifies the dimensions, transmission requirements, mechanical requirements, environmental requirements and the test methods of silica glass multimode optical fibers using silica glass as a core and a cladding.

 

Taiwan Electric Insulator Co. Ltd. is a world leading manufacturer of fiberglass fabrics and composite materials, with the technology, knowledge and ability to produce the highest grade composite material to specific customers’ needs and requirements. Welcome to visit TEI’s website to learn more information about fiberglass fabrics, and feel free to contact with us.

 

 

Article Source: http://www.globalspec.com/learnmore/materials_chemicals_adhesives/composites_textiles_reinforcements/glass_fibers_fiberglass_cloth

A Wonder in the Materials World: Stainless Steel Sheet

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Material scientists have created stainless steel, the most versatile alloy which can be seen in its many applications because of its corrosion resistant properties

 

The introduction of a minimum of 12% chromium into the steel alloy renders it corrosion resistant. This resultant product is called stainless steel sheet. There are many grades according to the alloy content and they are named variously as austenitic, martensitic, ferritic, precipitation hardening, super and duplex alloys.

 

Popular Grades of Stainless Steel

 

Austenitic grades of alloys which are stainless and non-magnetic. These cannot be hardened by heat treatment. Commonly used austenitic alloys are iron-chromium-nickel steels. The common grades are the 300 series which are used for their stainless properties and unusually good mechanical properties. The basic grade of this series is the 304. The L grades of this series are the low carbon grades (as in 304l) which provide extra corrosion resistance after welding. The carbon content is kept at 0.03% or less to avoid carbide precipitation. Higher carbon content is useful when the metal is subjected to very high temperatures and has to retain its strength.

 

The two other popular grades in this series are 316 and 317

 

Martensitic Grades of Alloys which are corrosion resistant and amenable to hardening by heat treatment. These are chromium steels with no nickel content. They are magnetic. The most common grades in this are the basic 410 and 420, where 420 has increased carbon more than 410 to improve its mechanical properties

 

Ferritic Grades – Even more corrosive resistant than the martensitic grades, these are highly resistant to cracking due to stress related corrosion. These are also magnetic with only chromium and no nickel. They are considered inferior to austenitic grades, but superior to martensitic grades. 430 is the base grade, which is used commonly.

 

Physical Forms

 

They come in a variety of forms like coils, sheets, bars and plates

 

Applications

 

For its easy maintenance and corrosion resistant properties, stainless steel sheets find diverse applications in:

 

  1. Modern architecture

 

  1. Food processing industry

 

  1. Industrial uses, such as chemical and fuel tankers, chemical plants and petrochemical plants, pharmaceutical industries (for hygienic environment)

 

What are Stainless Steel Sheets Standards?

 

There are many world recognized standards of stainless steel sheets which categorize the stainless steel sheets into different grades as explained above. These may be voluntary grading agencies, country specific agencies or associations of steel producing companies in a particular country. Sometimes any grade of steel marketed by a company will mention different standards of grading having been applied to it.

 

How the Demand for Stainless Steel Plated is satisfied?

 

There are suppliers worldwide who have industry specific grades available for their customers. They have websites and can be contacted easily for further details through a ‘contact us’ webpage. They are also present in social media like Facebook and Twitter. It does not matter if the supplier is from another country in this era of globalization. There is not much difference in the way of doing business.

 

Future of the Stainless Steel Sheet Industry

 

Since stainless steel sheet is such a versatile material, there is ongoing research and more grades are added to the existing ones as they are developed and tested, having unique qualities and different applications

 

The invention and countless applications of stainless steel sheet is a real wonder in the materials world and the future of the steel industry is bright with companies worldwide engaged in supply of this wondrous alloy.

 

STANCH, established in 1980, is one of the market leaders in refined stainless steel industry. We have devoted ourselves to providing high quality products and a wide range of stainless steel finishes. With experienced and advanced technology, STANCH is able to give full flexibility in customizing your needs. Learn more information about stainless steel sheet, welcome to contact with Stanch Stainless Steel Co., Ltd.

 

 

Article Source: http://EzineArticles.com/9580014

 

How do Pilot Operated and Direct Operated Solenoid Valves Work?

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What are Solenoid Valves?

A solenoid valve is an electro-mechanical valve that is used to control the flow of liquid or gas. The solenoid starts by converting an electrical signal into a mechanical movement. The signal is then sent to a coil and the movement then occurs inside of the valve. Solenoid valves are usually be described as pilot operated or direct operated/acting.

 

Pilot Operated Solenoid Valves

2 way pilot operated solenoid valves have two chambers separated by a diaphragm. The upper chamber is connected to upstream through a pilot hole in either the cover or diaphragm. The media exerts a pressure that acts on the upper side of the diaphragm and keeps the valve closed. When the coil is charged the core lifts off the orifice seat allowing the operating chamber to de-pressurize. The thrust of the upstream pressure under the diaphragm continues, lifting the diaphragm and opening the valve.

 

Pilot operated solenoid valves only operate with a suitable upstream pressure differential and do not operate at zero pressure. Also a minimum pressure differential across the valve is required to keep them open or closed. Pilot operated solenoid valves can provide high flow rates at high pressures with lower power consumption.

 

Direct Acting Solenoid Valves

Direct acting solenoid valves do not use a diaphragm, their seal is part of the moving core. Two way NC direct acting solenoid valves have a spring that holds the core against the seal. When the coil is charged the spring is overcome and the seal is lifted from the orifice seat thus opening the valve and allowing the media to pass through the valve.

 

Two way NO direct acting solenoid valves have a fixed core which usually in the bottom section of the armature tube. The armature is located in the upper part of the valve. A stem passes through the fixed core and is coupled to the seal. This is held off the seal by means of a spring and makes a seal when the coil is energized, thus closing the valve.

 

Three way direct acting solenoid valves work in almost the same way as a two way direct acting solenoid valve. The fixed core has an exhaust orifice running through it. The plunger has an upper seal and lower seal allowing flow to or from either the body seat or exhaust.

 

Direct acting solenoid valves are used when there is no line pressure applied. Typical applications would include a cleaning line when a pump supplies bursts of water through the line. A direct operated solenoid valve would remain closed, even when no pressure is being applied (i.e. in between the busts of water). This is in contrast to a pilot operated valve, which requires some pressure for the valve to stay closed.

 

Excellent Solenoid Valve Manufacturer in Taiwan

SHAKO is one of leading and the largest professional pneumatic solenoid valve manufacturers in Taiwan. With rich experiences and in-deep knowledge, we are able to provide pneumatic solenoid valve products with excellent high quality & rapid service for various industries. If you need more information about solenoid valve series, welcome to visit the website of SHAKO.

 

 

Article Source: http://www.bmengineering.co.uk/news/solenoid-valves/How-do-pilot-operated-and-direct-operated-solenoid-valves-work

 

What is a Die Sinker EDM Machine?

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A die sinker EDM machine is an industrial machine, used to create highly precise forms and structures onto metal plates. A die sinking EDM machine is used to manufacture moulds and templates, as well as press and injection moulds. The mass production of metal reforming, or plastic products with consistent high quality and highly precise dimensions, would only be possible with a die sinker EDM machine.

 

Highly Precise Cutting Using Sparks and Arcs

Since the invention of electricity, it is known that sparks can leave marks on metal surfaces. The cutting effect of electric arcs was only first researched in detail in 1770 by the British scientist, Joseph Priestley. The idea of finding a practical use for it arose over 150 years later. Two brothers from Russia, B.R. and N.I. Lazarenko, researched electric discharging as a new processing method for metal surfaces. These basic technological principles for utilization that they developed are still valid today.

 

Wire Erosion Discharge Machining – The Opposite of Welding

In principle, erosion is very similar to build-up welding. However, the erosion process is done backwards. During welding, material is applied to a workpiece and during erosion, the material is (with help of a conductor and high levels of electricity) evaporated off the workpiece. Using defined intervals and transitions, the metal is broken out of the block of steel with micrometer levels of precision. Despite the small work stages, spectacular sparks are still visible. The accumulation of sparks has no influence, however, on the precision of the surface area. The principle behind this is very simple: different polarized potential is applied to the workpiece and the conductor.

 

The evaporation of the material always takes place, where the distance between the electrodes is the smallest. That is how contours are produced, that cannot be exceeded in terms of precision. Burn and corrosion damages to the conductor and the workpiece can be avoided, as long as the erosion process completely takes place in a conductive, liquid medium. Die sinking should not be performed by assistants or temporary workers. It is essential to have extensive training and a lot of experience, in order to successfully manufacture workpieces through die sinking. For this reason, working with die sinker EDMs should only be conducted by specialists.

 

What can be Produced Using Die Sinking?

When working with a metal workpiece, the processing options with a die sinker EDM machine are unlimited. The erosion conductor can be moved in every direction using its 5 axel head. This freedom of movement allows for the processing of highly complex forms. Die sinker EDM machines are therefore much more efficient than CNC-milling machines. The erosion process is contact-free, which means that expensive drilling, milling or rotating tools are not needed.

 

Even pressing and punching tools are generally made out of specifically strong steel that resists machining operations. With normal CNC-processes, this process will wear out and ruin the tools and machines. With the contact-free erosion process, the hardness and firmness of a steel work tool plays no role. Because of the contact-free erosion process, die sinking EDM machines are durable and steady.

 

OSCAMRAX has been totally dedicated to design and manufacturing of electrical discharge machines and die sinker EDMs over many years. Our objective is to subvert the general impression of low machining speed of EDMs. Therefore, we have spent great efforts in developing high speed EDM machining technology, where to create the best results in speed, accuracy and surface roughness.

 

We offer the most comprehensive range of models including traditional type, CNC type and multiple 6 axes type in order to satisfy the market requirements precisely. If you need more information about EDM machines, welcome to visit our website and feel free to contact with OSCARMAX.

 

Article Source: https://www.surplex.com/en/machines/c/die-sinking-edm-machines-5081.html

A Discussion on Hand Tree Saws, Pruners, and Other Arborist Equipment

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As a dedicated arborist, you need to make sure you have the right tools to perform your job correctly, safely and utilizing your time. Of course, you want to keep the trees you are working in healthy and looking good. That means getting your hands on the best tree pruner, hand tree saw, and other arborist equipment. After all, the difference between doing a good job and a great job not only requires your skills but also your tool selection. Don’t let anyone tell you otherwise.

 

The Difference between Types of Tree Saws

 

When shopping for hand tree saws, you will come across various types of teeth and shapes of blade. These are not mere differences in aesthetics. Each has its own functional purpose. Here is a quick breakdown to guide you in selecting the right saw for your job:

 

  • Curved blade – Do you need a bit of control when cutting branches in tight areas? Do you need to cut quickly and speed up the job? Then this is the piece of arborist equipment for you.
  • Straight blade – A smoother cut at a slower pace than the curved blade. Hey you have to give a little to get a little right? Well, with the straight blade you also get the ultimate control.
  • Blades with gullets – Need something for bind free cutting? This is your ticket.
  • Fine teeth – Delicate cuts for smaller pieces of wood require smaller teeth. They will give you that beautiful, manicured look.
  • Large teeth – Obviously, these teeth come in handy when cutting larger branches. They work faster as you are not as concerned about making the cut perfect for the eye to see.

 

As you use your tree saw, keep in mind that you aren’t using a traditional hand saw. The term “saw” may imply that you move the piece of equipment back and forth to cut the wood. Not the case here whatsoever. Instead, make sure you use a downward stroke to cut the limb in one motion. Having trouble? Perhaps you need to replace your blade. They wear down faster than you might think making cutting more difficult.

 

Pruning Arborist Equipment

 

Poles, sheers, loppers-what are they and what are they for? Well, first of all you have the pole, which allows you to reach branches at various heights. Many arborist equipment suppliers allow you to build your own pole kit. That means you choose the head, base, and middle section to piece together for your required length. Most poles have interchangeable saw or pruner heads. Pruner poles come in wood, fiberglass landscape series, fiberglass professional series, fiberglass telescoping series and fiberglass dielectric series, which are poles that are foam filled for working around electricity. Silky Hayauchi poles extend to 21’ and come with saw blade only. The Silky Hayate extends to 20′ and is a saw blade only.

 

Sheers and loppers that are sold in arborist stores are of professional grade. They are for people who want an easier tool to use with continued performance year after year. Marvin brand shears and loppers are made from forged steel. These tools are not only great for the professional arborist and landscaper but general gardeners will appreciate their performance and lasting quality.

 

Remember, as a dedicated arborist, or even a power gardener, you need to make sure you have high quality arborist equipment.

 

Chan Long Enterprise Co., Ltd. specializes in producing hand saws used in PVC plumbing, carpentry, interior decorating, making freight pallets and tree pruning. Hand tree saw series is one of popular products in Chan Long. Welcome to visit our website and feel free to contact with Chan Long to learn more information about hand tree saws and pruning saws.

 

 

Article Source: http://EzineArticles.com/6502566

 

Overview of Sawing Machines: Hack Saw, Band Saw, and Circular Saw

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Sawing machines are primarily used to part material such as rough-cutting excess material away before machining or cutting curved patterns in sheetmetal. Sawing machines substitute mechanical or hydraulic powered motion for arm motion to achieve the speed necessary for production operations. The cutoff operation is usually one of the first requirements in any production process before any machining, welding, or forging is done. The saw blade has individual teeth that “track” through the workpiece, each tooth deepening the cut made by the preceding tooth in the direction of feed. The saw or work may be fed and by controlling the direction of feed, either straight or curved cuts can be made. The width of the cut (also known as “kerf”) is approximately equal to the thickness of the saw blade and because of this saw blades are made as thin as possible but with adequate tool strength and rigidity.

 

There are three common types of sawing machines, reciprocating or hack saw, band saw, and circular saw. These machines all perform the same operation but vary in capability, capacity, and application. Power hacksaws use a reciprocating stroke where on the cutting stroke the saw blade teeth are forced into the metal either by gravity or hydraulic pressure while on the return stroke the pressure is automatically removed to prolong saw blade life. Most of the machines come equipped with a chip tray and a cabinet base which contains the coolant reservoir and its circulating pump. Heavy duty power hacksaws come with automatic bar feeds where the stock is loaded on a carriage which automatically moves forward the necessary distance when the cutting is finished. Hydraulic pressure automatically operates the vise jaws, gauges the material, and raises and lowers the saw blade.

 

After being set up for cutting material to a specified length, the power hacksaw will operate automatically without need for an operator until all the material loaded on the carriage has been cut. Horizontal band saws are one of the most widely used sawing machines for cutoff operations. These band saws range from small manually operated machines to large, fully automatic production machines. Vertical band saws are also used but are primarily manually controlled machines used in tool rooms and shops for maintenance and low production work.

 

Band saws have several advantages over other kinds of cutoff machines. The saw blade cutting width or kerf is 1/16 in (0.16 cm) compared to 1/8 in (0.33 cm) for power hacksaws and abrasive disc circular saws, and 1/4 in (0.64 cm) for cold saws. This can represent a sizable savings especially when cutting large or expensive material. The thinner saw blades also require less power to cut through material making them more economical to operate. Because bandsaws have endless blades (band saw blades are welded together to create an endless loop) which cut continuously, the cutting rates are much higher.

 

Two of the most popular circular saws are the cold saw and the abrasive disc cutoff saw. Cold saws are low rpm circular saws for metal cutting. These saws range in size from hand-operated bench-top models with 8 in (20 cm) blades to fully automatic machines with blades of 3 in (7.6 cm) diameter and larger. Light duty manual or automatic machines are sometimes equipped with a swivel head which enables cuts to be made at different angles. These saws are mostly used for cutting structural shapes such as I-beams, angles, and channel sections because the circular blades can complete their cuts with less travel than straight blades. Heavy duty machines are available with bar feeds and can be used for cutting solid bars up to 10 in (25 cm). Material larger than this size would require excessively large blade diameters, which must be more than double the cutting capacity, which would become too costly along with the machine necessary to drive them. Different speed ranges are provided for cutting metals of different hardness and toughness, and built-in coolant systems help produce better finishes and prolong blade life.

 

Abrasive cutoff saws utilize an abrasive disc to separate material by using a grinding action. Abrasive cutoff saws are built for either manual operation or with power feeds, with either fixed or oscillating wheel heads. Oscillating wheel heads are used when cutting thick sections of tough materials such as titanium, nickel-based super-alloys, and other high alloy steels. Sizes range from small bench-top machines with 8 in (20 cm) wheels to bigger machines with 20 in (50 cm) or larger wheels. Abrasive cutoff saws are very useful for rapidly cutting small sizes of bar stock, tubing, and structural shapes and also for cutting tough or hardened materials that cannot be cut efficiently with other types of saws.

 

EVERISING is the manufacturer that has been specializing in mid to large size band saws and circular saws. If you are interested in band saw and circular saw series information, please do not hesitate to contact with us to learn further details about them.

 

Article Source: http://science.jrank.org/pages/4043/Machine-Tools-Sawing-machines.html

 

Electric Towing Tractors Exhibit Glamorous Look and Deliver Quality Performance

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Tow tractors and electric stackers offer extensive usability in industrial sectors. The main difference between traditional and modern engineering equipment is that the modern items are more developed and can deliver better performance at faster pace. The market of electric stacker and electric towing tractor is very competitive and that is why manufacturers of such items keep the prices at reasonable level.

 

Electric stackers come in different designs. Their price range varies in accordance with the sophistication of their configuration. Of the top-notch stackers, pallet movers are supplied along with powered drive and lift. As far as carrying loads is concerned, electric stackers are empowered with enhanced capacity. The lift that is attached with it is tall in height and measures 840mm. Some of their breeds are specifically manufactured for moving pallets. In such cases, electric stackers are so designed that they can lift up variants of pallets.

 

They are fitted with cramped and narrow aisles to maneuver pallet loads. These intricately designed items are armed with many advanced features. One of the prominent features of electric stackers is that users can not only lift up items but also have infinite control over lifting with the help of smooth hand controlled powered system. This system facilitates the smooth functioning of the machine. These electric stackers are heavy weighted items. Adding to its popularity is the addition of compact and new features.

 

Electric towing tractors are an outcome of constant efforts on part of the manufacturers to devise new ideas and develop them into newest models. They have found users at different work places. Warehouses, factories, laboratories, hospitals are some of the places where they are extensively used. They have long life span as they are powered by traction battery of high capacity. They are capable of standing wear and tear of time. To operate this high-tech machinery, one needs to hook up the tow hitch to the required trailer. There is no problem in working with these bulky items in a tight area.

 

Electric towing tractors are capable of moving in upward and backward directions with control over their speedy movement. The inclusion of advanced breaking system lends the items complete look.

 

From the aforesaid overview of both of the items, it has become quite evident that they are capable of outsmarting their peers in every aspect of performance. Electric stackers as well as tow tractors have earned much appreciation among users due to their high-end performance. The fact that they can be used for a prolonged time period has also made a strong appeal among the users. The last but not the least is the glossy looks of electric stackers and tow tractors.

 

Established in 1973, Tailift is an expert of specializing in research and development of material handling equipment. Our forklift trucks are sold to more than 50 countries around the world, and enjoy the considerable success in several markets. Tailift manufactures serial types of materials handling machines include ICE counterbalance trucks, electric counterbalance trucks, pallet trucks, stacker, reach truck, tow tractors and VNA trucks. If you need more information about electric towing tractor and more forklifts series, welcome to visit our website and feel free to contact with Tailift.

 

 

Article Source: http://EzineArticles.com/3667394

Comparisons between Variable and Fixed Displacement Hydraulic Pump

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A hydraulic drive system uses a pressurized fluid to deliver force to distant machinery. Each system has several common components; the most universal is the hydraulic pump. The pump’s purpose is to pressurize the hydraulic fluid so that it will travel down the line and perform work on the other side. In an ‘open loop’ system, the fluid is drawn from a reserve tank, and deposited into the same tank after it has done its work. In a ‘closed loop’ system, the fluid is brought directly back to the hydraulic pump after passing through a hydraulic filter.

 

Fixed Displacement Hydraulic Pump

A fixed displacement hydraulic pump has a set flow rate — every stroke of the motor moves the same amount of fluid. Fixed displacement pumps are

 

  • Simple
  • Relatively inexpensive
  • Easier to maintain

 

The simplest type of fixed displacement pump is the gear pump, in which the hydraulic fluid is pushed by rotating gears. In some models, the gears are sequential; in the quieter and more efficient version, the gears are interlocking. Another common variation is the screw pump, which uses the classic Archimedes screw, which looks much like a drill bit, to move the fluid. They have the advantage of providing a high rate of flow at relatively low pressures.

 

Variable Displacement Hydraulic Pump

In a variable displacement pump, the flow rate and outlet pressure can be changed as the pump operates. This results in variable displacement hydraulic pumps that are

 

  • More complex
  • More expensive
  • Capable of doing a wider variety of jobs

 

The most common type of variable displacement pump is the rotary vane pump, which is a variation of the gear pump in which the ‘gear’ is offset and the ‘cogs’ aren’t fixed, but rather extend and retract as the gear turns, allowing the pump to increase the pressure of the fluid by compacting it as it pushes the fluid through. The top-tier pumps, however, are bent-axis piston-and-cylinder pumps, much like the ones that are used in an internal combustion engine.

 

Simple, fixed displacement hydraulic pumps are perfect for single jobs that need to be repeated indefinitely over long periods of time; variable displacement hydraulic pumps can be used to power a wider variety of tools, but require more expense and more attention.

 

Anson is the professional intra vane fixed displacement hydraulic pumps manufacturer in Taiwan. We provide various intra vane pump series, including IVP series, IVPQ series, IVPV series, and cartridge kits and so on hydraulic pumps. Welcome to send inquiries and feel free to contact Anson for more details about fixed displacement vane pumps and more hydraulics.

 

 

Article Source: http://peerlessengineering.com/blog/hydraulic-pumps-fixed-vs-variable-displacement/