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Thursday, August 26, 2010

What Can You Use Bridge Cranes For?

They said that bridges are connecting people. When we are lookaround there are a lot of the bridges around us. They connect one placewith other and make our trip and destination much available. But, todayin the modern industry there are some innovations that usually used forconnecting one place to another. The most used in the industry is bridgecrane.

大胆美女人体摄影Bridge crane is using for transferring small or huge cargo from onepoint to another. There is not only bridge crane in use, but also thereare and gantry cranes which are used for transferring much heavierburden. So, there are more types of the cranes, but the most used arebridge cranes. These cranes can move in the more than one axe of motion.It could be moved up and down, left and right and forward and backward.Also this crane has two tracks that are use for transferring of thecargo. So, the system that are used for this crane is similar that isused for lift on mountains for skiing.

A Bridge crane is used in the industry for building, but todaythere are some brave people who are using cranes for fun. I amtalking about those people who are using cranes for bungee jump. Lastyears this discipline in sport becomes very much popular. But, it isonly for those with healthy heart and who enjoy in extreme sports.Today, you can see a lot of the fixed cranes in the lot of the citiesthat used for bungee jumping and if you have a lucky maybe you will beone of the persons who watch jump a live. I have to admit that minefirst jump with bungee jump was from the crane with 60 m and it was veryscary, but the second one was very good. If you are brave enough usethe cranes or bridge or tower for bungee jump and see the value of thelife.

But, talking about bridge crane, it is much used for finishing somejob, some building or some transferring. The weight that could be movedwith this crane is from 2 or 3 tons and could be more than 500 tons.But, it is also, very important to mention that only trained workers,who has passed courses for utilizing with cranes, may use and operatewith cranes. So, operating with cranes is not easy job. The workershould to have clear view on the area where he works and to make surethat nobody is in the area where crane is operating. So, it not onlythat area should be clear from the people, than also from the materialswhich can influence on some accident.

So, if you need to move some heavy equipment than for sure thatthese, bridge cranes, are the best solution for you and for resolvingyour problems. But, if you are not an expert for using it, than itshould be better for your safely and safely of yours environment to hirean expert with passed courses of it.

Wednesday, August 25, 2010

ELECTRIC OVERHEAD CRANE

What Is an Electric Crane?

Cranes have been in construction and manufacturing industries sinceages. This easy machine has gone undergone substantial changes to adjustto the requirement of its users, and an electric crane is one of themost recent technological developments. These machines are smaller thanthe bigger construction cranes and are of two distinct types that helpin small and precise jobs:

  1. Jib crane
  2. Overhead crane.

The electric crane is known to be environment friendly and isquieter than other lifting equipment. All cranes make use of leverage aswell as external power for lifting and lowering items with more potencythan humans. The cranes are believed to have been manufactured by theGreeks in the 6thentury B.C. and made use of the same standards of awinch and pulley as well as a long leverage boom that are still usedtoday. With time, new sources were used for developing pulleys likeanimals, man, fossil fuels and lately, electricity.

The electric jib crane covers the most ancient form of electriccranes due to its boom arm design.This arm usually is escalated to afloor or wall to give it the stability required for lifting heavierobjects. The electrical motors facilitate the horizontal and verticalmovement of arms, giving them the liberty o full motion like a humanarm. They can be scheduled to perform same functions repeatedly, such asfactory work like warehouse operations and construction work.

The most popular type of crane is the electric overhead crane thatis used in many organizational and manufacturing settings. Thefundamental system of the electric crane is a chain of overhead metalgirders acting as a track for the cranes for forward, backward, upwardand downward movement. An electric motor facilitates the movement besidethe girders as well as the wench-and-pulley system that is used forlifting. Overhead cranes are used in factories that move large itemswhere tools like conveyor belt cannot be used. Organizational industrieslike docks and warehouses also make use of overhead cranes for movingand reordering heavy objects.

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Power and precision are two main benefits of an electric overheadcrane. They run more quietly and faster than the fueled-engines cranes.This facilitates easy communication because of less noise. Mostimportantly, they are environment friendly in comparison to the use offossil fuels.

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The LX Mode Single-girder Suspension Electric Crane is manufacturedand designed firmly as per the national standards. It is a light andsmall kind fitted with CDIor MDItypeelectric hoists. It has a lifting capacity of 0.5t-5t, its span is3-16m, and the working classification is A3-A4 and its ambienttemperature should be around 25+40?. It must not be used inan environment that has explosive, corrosive and combustible media. Itis commonly used for the movement of goods in shops and warehouses. Itcan be monitored from the ground, remote control or ground and remotecontrol together, etc.

Tuesday, August 24, 2010

What are Used Gantry Cranes?

Cranes are something that are used to carry heavy load from oneplace to another. Cranes are not only of one type, but they arecategorized into many types, based on their basic purpose and use.Gantry cranes are one of the most popular and commonly used cranes. Analternate name for such cranes is overhead travelling cranes. Thesecranes lift or carry objects by a hoist which is basically fitted in atrolley, and can be moved horizontally on a rail or a pair of railsfitted under a beam. One of the types of gantry cranes is the usedgantry cranes. If you cant afford the expanses of a new gantry crane,for your load or cargo shifting, then why not to opt for them.

Advantages of Buying Used Gantry Cranes

  1. The first advantage of buying used crane is assurity factor, as the used ones are the good operational cranes.
  2. Another advantage of these cranes is that they are in stock.
  3. There is shipment facility for these cranes by most of the crane companies.
  4. Another great advantage of these cranes is that they can be easilyre-span, according to the requirements and needs of use, whereas thebrand new gantry cranes cannot be re-spanned.
  5. These are money savers. You can save a great amount of money by buying these cranes, instead of buying the new ones.

Tips to Buy the Used Gantry Cranes

It’s a wise step to buy the used gantry cranes instead of going forthe new ones. But there are some tips that should be followed for buyingthese in order to ensure that the quality is not compromised even onthe second hand cranes. Some of the tips are given below.

  1. Pay special attention to the span of the arm of the crane.
  2. Take a detailed look at the performance of the used crane. Always ensure that it is not hard to manipulate.
  3. Speed of the crane is very important. So, always consider thespeed of the lifting of crane, because otherwise it would take too longto load the desired material or load.
  4. Also check the lifting capacity of the used crane. If it wouldhave a great lifting capacity, then the load or the cargo will beshifted with ease and in less time as well.
  5. Also check the overall performance of the crane. Always ensurethat the rust invasion is not more than 25 %, because the rust lowersthe performance of the crane and if the rust invasion would be more itwould end in low performance.

Though the used gantry cranes are expected to have lowerperformance, as compared to the new brand ones, but with proper care,maximum performance of the used crane can be restored. So, instead ofwasting your money on the new and brand new cranes, simply buy the usedone and make them new with care.

Monday, August 23, 2010

Safe Rigging for Gantry Cranes

Cranes which hoist and transfer heavy objects fitted into ahorizontally moving trolley are categorized as gantry and overheadcranes. These trolleys typically move over rails on the crane’s centralbeam. Lifting the massive objects requires thorough preparation andcare.

Rigging is the term used to denote the procedures involved in theoperation of moving the heavy weight objects using gantry cranes. Thesafe rigging for gantry cranes includes a set of standards to befollowed strictly by the rigger. It is also advisable to understand andcarry out all instructions detailed by the crane manufacturer as thiswill ensure the operation is completed without any damage, to the objector anything in the crane’s radius.

The subject of rigging has become a necessity not only for thoseinvolved in the trade but even those outside it. The study has broughtrecognition to all the terms in heavy duty crane operation. To thelayman the “riggers” are those who hook the load to a crane hook andconsiders the job done but crane rigging is a lot more than just movingheavy objects and the workers involved are specially trained. Theworkers who are a part of the rigging process are called riggers andthey are mainly responsible for the safe rigging for gantry cranes orany other type of overhead cranes. They must have all the skillsrequired to move the massive objects efficiently and safely. Before therigging begins it is recommended to conduct a pre-use inspection of thegantry crane.

Pre-use inspection standards to ensure safe rigging for gantry cranes

  1. Before the operations begin all the controls must be repaired or adjusted by the authorized personnel.
  2. The operation of the crane under conditions such as no-load condition must be verified.
  3. Load chains and ropes must be visually inspected.
  4. Inspections must be current, this maybe verified by checking theinspection sticker, documentations or confirming with the custodian ofthe equipment.

Basics of safe rigging for gantry cranes

  1. Ensure the rigging is authorized and handled by an experienced rigger.
  2. The rigger must follow instructions that pertain to the typegantry crane used in the operation. This would require knowledge of theload capacity and the safety ratings of all the hardware such as hooks,shackles, clamps and slings.
  3. The gantry crane manufacturer’s criteria for inspection and rejection must be considered. The general criteria include:
    • Choosing the right rigging equipment.
    • Inspecting all hardware being used in the process.
    • Storing rigging equipment properly.
    • Maintaining accurate rigging charts and load calculations.
  4. The rigger must understand the consequences of shock loading; also demonstrate how such situations can be avoided.

Apart from the standard requirements the equipment in use must haveundergone different types crane testing. Gantry cranes are tests includeperiodic load test, rated load test, operational test and load-testweight. These steps ensure the safe rigging for gantry cranes, suchprocedures help both in the maintenance of the crane and the safety ofworkers and hardware involved in the operation.

Sunday, August 22, 2010

Rolling Gantry Cranes

Industrial load lifting cranes are available in a number of typesand sizes. They are mainly grouped under traveling, portable, or fixedtype. Gantry cranes are the portable or traveling type that is used formaterial handling and processing; they consist of two A-frame supportlegs with one or more central beam carrying a load hoisting mechanismthat is either fixed or movable. These cranes are available in differentvarieties depending on its usage and load capacity. There are manytypes of gantry cranes as well; they are usually classified as doublegirder cranes and single girder cranes based on the central beam of thegantry crane.Rolling gantry cranes run on the ground rather than usingoverhead runways thus eliminating the need for special runway structureor concrete foundations. These are also referred to as portable gantrycranes because of the ease in transporting the equipment betweenfacilities. They have been used in heavy duty industries as analternative to bridge cranes.

The wheels on a rolling gantry crane can handle rough surfaces andcan withstand oil, water, and many other chemicals.The wheels areusually made of steel or Polyurethane that prevents wear and tear fromlifting operations, this also ensures that the rolling gantry cranerides smoothly. The movement of the rolling gantry crane can becontrolled manually or using computers making it easy to relocate theequipment, so instead of bringing the load to the crane the rollinggantry crane itself can be moved to the location of the load.Transportation of gantry crane is one of its major advantages whencompared to the overhead bridge cranes. Swivels and cam brakes are extraaccessories that may be used to enhance the mobility of the gantrycrane. Some of them require fixed length V-groove tracks as an addedfunctionality to transport the load.

Applications of rolling gantry cranes

  1. Handling materials can be localized.
  2. Materials maybe lifted and transported anywhere in the facility.
  3. The equipment is more efficient than other machines used for pulling or maintaining products.
  4. The equipment is a good option for facilities where lifting operation are not very frequent.

The gantry cranes come in many sizes and can be used for very heavyload lifting as well as for light load lifting. They come in fixed orvariable height that allows for customized lifting heights. The rollinggantry cranes are more efficient than forklifts or boom cranes. Theequipment is versatile and can be transported easily unlike fixedoverhead cranes that need solid foundations. They have a high load limitand come in different sizes and weight.

There has been a lot of advancement in gantry crane design andtechnology, light load lifting operations and heavy load liftingoperations are carried out with the same ease and efficiency. Heavy dutygantry cranes have wheels that are designed to move the equipment inlinear and lateral paths or even rotate the entire equipment on itscenter. These are the new-age rolling gantry cranes that are being usedtoday in many warehouses and other shipping or industrial environments.

Rolling block gantry cranes

Gantry cranes or overhead bridge cranes are a type of crane thatlift and transfer heavy objects fitted into a horizontally movingtrolley. The trolleys present here usually move over rails laid out onthe central beam of the crane. Thorough preparation and care goes intolifting the massive objects, the procedure of mounting the load iscalled rigging and skilled workers are employed to hoist the load on thegantry crane. The mechanism that operates the crane is mounted on atrolley that runs along the rail. The hoisting of the weight is madepossible by the rolling blocks that are a part of the central beam ofthe structure. The rolling block allows the trolley to smoothly rideover the rail-like tracks on the beam and further ensure the load is inplace with the help of slings or cables.

Working with the gantry crane rolling block

The upward and downward movement of the items is controlled byrunning a cable or rope through the trolley-mounted mechanism thatincludes the rolling block. Slings that pass through the rolling blocksecure the hoist and help the object move with the trolley. Thus, theobjects can be moved horizontally along the rail. Flexible jib cranesare different from the overhead cranes in that they have swinging boomsto allow movement of objects in all directions, an overhead crane or agantry crane only allows back and forth movement. The back and forthmovement is sufficient for all types of gantry cranes with rollingblocks on the rail lined bridge.

The length and strength of the slings threaded through the rollingblocks are calculated according to the weight hoisted on the gantrycrane trolley. There have been incidents where the hoist has collapseddue to incorrect calculations. The gantry crane rigging must be suchthat the weight is supported easily on the rolling block; this in turnwill allow the load to be moved along the rail freely without any strainon the equipment.

Example of the rolling block in action

To understand the working of the rolling block along with the restof the gantry crane parts consider the example of container cranes.Container cranes are a type of gantry crane that are sometime mounted ona V-track for easy movement if the equipment. A container ship can bepositioned near the crane; in some instances the crane itself straddlesthe cargo ship. Once the equipment is positioned the rigging procedureensures the rolling block and the load are mounted correctly and thelifting of the object begins.

The mechanism is used to send the load back and forth along thetrolley to shuttle containers or goods from the ship to either a flatbedtruck or train. It can be made to work the other way as well so as toload the ship instead. By being fixed in place, the crane is much morestable and capable of carrying heavy loads, a unique advantage whenhandling heavy weights involved in steel working, shipping and otherheavy industries.

Saturday, August 21, 2010

Overview On Wire Rope Hoists

Today there are a lot of types of the cranes that are used into theindustry. One of the usually used is hoists crane. Actually there are atwo characteristics that definite it. That is lifting medium and powertype. So, lifting is also known as wire rope hoists, and power is knownas chain host. Both of these hosts are made for moving cargos and theyhave been dating since 1800s. The only different between them is aboutthem weight. Wire rope is much light weight and it is more intended fordrums work, but chains are larger, bigger and also heavier, so the cargothat they can move is also heavier.

No matter of the weight of both cranes, they have equally purposeand use in construction. Wire rope hoists could be used for constructionfor large building, but also they could be used and in undergroundsmines. They have more section and each section of mast is about 7,60 m.In these days with developing in the industry, wire rope hoists arepowered by electricity. But also, they could be operated by human’spower, or by using water or even animals power. This ways of usinghoists are more used into the underdeveloped countries or even in somecountries in transition. But, knowing that industry, technology andsciences are developing, make us to believe that in the future therewill be fewer countries with electricity or elementary conditions forlife.

Different types of the hoists cranes have and different propose.

But, all of them are intended for building and they are most useinto the construction and steel industry. So, which type of the craneswill you use depending of the type of the job that you should to do.Also, the costs of the cranes are different depending of the types, buttoday you can find a lot of the used cranes and hoists. Used cranescould be very good choice especially if you are at beginning of thework. Also, if you are not contractor or you just start with thisbusiness, than used cranes, any of type, could be very claver decision.But, in the same time when you are choosing some of the used cranes orhoists, you should take in considering few things:

  1. Many of the used cranes are very old, so you maybe need to buy alot of the parts for it. Also, there are lot of them have componentsthat are very specifically made, so maybe you will need to make somechanges on components.
  2. With modification it comes and the question of your liabilitiesthat you have made on the cranes. So, can you hang on the safely of it?
  3. Very important thing with buying old crane and especially usedwire rope hoist, or even new, is to check your electricity supply. Thatis because there are many cases when people buy crane and after theybought it they figure that it does not mach to their voltage.

Cranes and hoists are in the use and they can make our work fasterand easer. But, for using them you will need some training andintroduction with their work.
Keyword: Wire Rope Hoists