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disadvantages of electromagnetic crane

An electromagnetic crane is a type of crane with an electromagnetic lift. Electromagnetic cranes are commonly utilized in lifting and moving various scrap metals. It does not have the mechanical 'pincers' of a regular crane, instead, it has a large flat magnet which draws the metallic materials to it. Using the principle of electromagnetic induction, these large machines are used to handle scrap ferrous metals, such as iron and steel, which can be found in junk yards and recycling plants. Beyond the area of lifting magnetic materials, another use of an electromagnetic crane is that it makes for smooth and safe stops due to its solenoid brakes (electrically controlled brakes which can be turned on and off by a solenoid). These brakes are the ones being used on movable bridges as it allows the passage of boats and barges. How The Electromagnetic Crane Works: An electromagnet is a type of magnet wherein the magnetic field is produced by electric current, and the field disappears whenever the current is turned off. Electromagnets are being utilized in everyday items, just like loudspeakers and doorbells. An electromagnetic crane has a large electromagnet which can be turned on and off. The electromagnet contains an iron core with a wire around it, and this wire is the medium by which the current travels. The magnetic strength of an electromagnet relies on the number of turns of the wire around the electromagnet's core, the current through the wire and the size of the iron core. Increasing these elements will result in an electormagnet which is significantly larger and stronger as compared to a natural magnet (which explains the enormous size of the crane's magnet). For the electromagnet to be turned off, the core must be made of soft iron. Therefore, turning on the electricity will enable the magnet to work, and turning off the electricity will be able to shut it down. Dismantling the old crane Over the past years, the existing cranes at voestalpine Rotec...

Bridge Crane:JLQ-1.0 Series /5-100t Bridge Crane JLQ-1.0 Series Bridge Crane with Hook is widely used in factories, workshop and warehouse, etc, for the general loading, unloading, lifting and transportation indoor or outdoor fixed span. This crane includes box-type bridge, large cart traveling mechanism, small cart and electrical equipment. Note: when outdoor using, rain proof equipment is necessary. This series of cranes adopt advanced electromotor, speed reduction gear and brake, which are produced by spec ial ised manufacturers, as a result of which made standardizat ion and generalization of all parts. To guarantee safety, lifting mechanism is equipped with weight limiter and height limiter. Traveling mechanism uses polyurethane buffer with long stroke and small buffer force. Drivers cab is comfortable with broad vision, which makes the operation of the crane easier. The crane is equipped with maintenance suspending cage, convenient for the maintenance of large cart integrator. Bridge Crane:JLQ-2.0 Series/5-100t Bridge Crane JLQ-2.0 series bridge crane with hook is widely used in mechanical manufacture, metallurgy, energy, power plant, railway, transportation, military industry, aerospace, light industry, chemical industry, mine, warehouse, logistics, and all other industries, plant or workshop. Main Characteristics: Light self-weight, small wheel load, low energy cost, Small dimension, wide working scope, personalized design, stable quality, liable and good property, advanced manufacturing technology. According to different requirement of customer ( non-standard products), JLQ-2.0 series of products have realized combination of different parts. Within the shortest time, we are not only able to offer detailed technical specification and drawings to our customers, but also customize cranes conforming to the requirement of customers. Ladle Crane:75/32t-240/65/15t Ladle Crane Ladle crane is a type of metallurgy bridge crane for steel factory. It is...

It is found that electromagnetic brakes can develop a negative power which represents nearly twice the maximum power output of a typical engine, and at least three times the braking power of an exhaust brake. (Reverdin 1994). These performance of electromagnetic brakes make them much more competitive candidate for alternative retardation equipments compared with other retarders. By using by using the electromagnetic brakes are supplementary retardation equipment, the friction brakes can be used less frequently, and therefore practically never reach high temperatures. The brake linings would last considerably longer before requiring maintenance and the potentially brake fade problem could be avoided. In research conducted by a truck manufacturer, it was proved that the electromagnetic brake assumed 80% of the duty which would otherwise have been demanded of the regular service brake (Reverdin 1974). Further more the electromagnetic brakes prevents the danger that can arise from the prolonged use of brake beyond their capability to dissipate heat. This is most likely to occur while a vehicle descending a long gradient at high speed. Ina study with a vehicle with 5 axles and weighting 40 tones powered by a powered by an engine of 310 b.h.p travelling down a gradient of 6% at a steady speed between 35 and 40 m.h.p, it can be calculated that the braking power necessary to maintain this speed ot the order of 450 hp. The brakes, therefore, would have to absorb 300 hp, meaning that each brake in the 5 axels must absorb 30 hp, that a friction brake can normally absorb with selfdestruction. The magnetic brake is wall suited to such conditions since it will independently absorb more than 300 hp (Reverdin 1974). It therefore can exceed the requirements of continuous uninterrupted braking, leaving the friction brakes cool and ready for emergency braking in total safety. The installation of an electromagnetic brake is not very difficulty if there is enough space b...

The working principle of the electric retarder is based on the electric retarder is based on the creation of eddy currents with in a metal discs rotating rotating between two electro magnets, which set up a force opposing the rotation of the discs. If the electromagnet is not energized, the rotation of the disc free and accelerates uniformly under the action of the weight to which its shaft is connected. When the electromagnet is energized, the rotation of the disc is retarded and the energy absorbed appears as heating of the discs. If the current exciting the electromagnet is varied by a rheostat, the raking force varies indirect proportion of the value of the current. The development of this invention began when the French company Telma, associated with Raoul Sarazin, developed and marketed several generations of electric brake based on the functioning principle described above. A typical retarder consists of stator and rotor. The stator hold 16 induction coils, energized separately in group of four. The coils are made up of varnished aluminium wire mounted in epoxy resin. The stator assembly is supported resiliently through anti-vibration mountings on the chasis frame of the vehicle. The rotor is made up of two discs, which provide the braking force when subjected to the electromagnetic influence when the coil are excited. Care fully design of the fins, which are integral to the disc, permit independent cooling of the arrangement.

The construction of the electromagnetic braking system is very simple. The parts needed for the construction are electromagnetic, rheostat, sensors and magnetic insulator. A cylindrical ring shaped electromagnet with winding is placed parallel to rotating wheel disc/ rotor. The electro magnet is fixed, like as stator and coils are wounded along the electromagnet. These coils are connected with electrical circuit containing one rheostat which is connected with brake pedal. And the rheostat is used to control the current flowing is used to control the magnetic flux. And also it is used to prevent the magnetization of other parts like axle and it act as asupport frame for the electromagnet. The sensor used to indicate the disconnection in the whole circuit. If there is any error it gives an alert, so we can avoid accident.

the energy requirements of braking at high speeds, completely without the use of friction. Due to its specific installation location (transmission line of rigid vehicles), electromagnetic brakes have better heat dissipation capability to avoid problems that friction brakes face times the braking power of an exhaust brake.

Lifting magnets are used to move and position ferromagnetic (often steel) work pieces of various shapes and lengths quickly and without damage. A lifting and hoisting magnet saves valuable storage space and time.

They only attract ferrous ( Iron containing) metals and not even all of them. Stainless Steel is Non-magnetic, it thus can be used on compass housings ( like the Sperry Iron Mike) but is not attracted to magnetic fields. It is not possible to fine-tune the electromagnet to adjust for this. There are or were some electromagnets designed to attract aluminum- there is a book about this from Lindsay"s. This would be useful iln recycling beverage cans, which are nearly all Aluminum. though some food cans have steel tops as they work with magnetic can openers. This is common with Cat Food. By the way Crane Magnets ONLY function normally on DC.

They only attract ferrous ( Iron containing) metals and not even all of them. Stainless Steel is Non-magnetic, it thus can be used on compass housings ( like the Sperry Iron Mike) but is not attracted to magnetic fields. It is not possible to fine-tune the electromagnet to adjust for this. There are or were some electromagnets designed to attract aluminum- there is a book about this from Lindsay"s. This would be useful iln recycling beverage cans, which are nearly all Aluminum. though some food cans have steel tops as they work with magnetic can openers. This is common with Cat Food. By the way Crane Magnets ONLY function normally on DC.

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