Electrichoist is not a piece of cloth, depression, we can not repair things, directthe repair, this time we have to think of any solution.

Electric hoist from the ground, first wehave to build a maintenance platform, based on the damage of the steel wirerope and rope guide, decide whether to dismantle, if you need to replace thewire rope and wire will be all removed. Then normal pitch of the drum and thehousing with a ruler to measure the L, the spool and the housing recess at theminimum spacing R, the maximum diameter of the recess is D, based on the dataof the three above, select the diameter d of the high-strength member length Q,requirement is R <d <L,Q> D, high-strength components at the repairsite generally choose a more convenient screw, high strength, diameter, withoutteeth sawing length can screw ready, screw placed in the edge of the drum andthe housing depression pitch, jog electric hoist control handle button, so thatthe reel rotates counterclockwise, and gradually feed screw, the torque effectof the roll extrusion screw, screw oppression case depression, forcing thedepression recovery to be fully restored, roll clockwise, exit screw. Finally,wire rope, hook and rope guide installed, debugging limit can be.

Any industry, as long as it is related tosales, then it will certainly be faced with how to open up the market as muchas possible, to seize more market share, especially in the field market share,foreign markets simply classified as: foreign and non-local domestic market. Hoistas lifting uninstall a sub-industryindustry products, one, of course, also a number of sales in the industry isalso facing the problem.

Electrichoist application range is wide, the same production and operation of thisalso a lot of businesses, electric hoist is not the same with any otherproduct, its sales unlike other products, its every transaction volumes aresmall , where it is needed, but the total number is not a lot, eachmanufacturer's production capacity, however, are huge, they can produce moreproducts, but sales has not kept pace, this is undoubtedly limits thedevelopment of enterprises, more open to a wide range of markets must be theway to go!

How to open foreign markets? Whetherforeign or domestic, should be done in line with market demand, each localmarket is certainly different, there must be differences of East and West, notto mention domestic and foreign, which requires us to prepare a clear grasp ofeach local market demand they are interested in what styles and types of products,demand, so that we make the appropriate deployment, closely follow the changesin the market! The relationship between supply and demand as much as possibleto achieve a balance!

With the rapid development of the nationaleconomy, lifting and moving operations areused in various fields of economic construction, more and more frequent andwidespread. Wire rope material through processing, important for lifting, traction, rope tension and hosted.Rope have high strength, light weight, things Ann stable, less abruptly brokenthe entire root characteristics, over the use of iron and steel, chemicals,transportation, ports and other industries.

As we summarizesome of probably the environment, showing one of the following environmentsshould curb the use of wire rope.

1.Pillow meltingas charged arcing caused by wire rope or long-term show lower intensity is raisedin a low-temperature environment  

2.Splicing at asqueeze of tension, wear, metal casing damage or diameter is reduced to 95% ofthe original diameter of the rope end is firmly a the adjoining metal casing orsplicing sector slipping off

Lifting machinery:small light lifting machinery, hoist, hanging the Sheep rail system, inaccordance with the characteristics of bridge cranes and overhead cranes,gantry cranes, semi-gantry cranes, jib cranes, mobile cranes, tower cranes,portal cranes and other lifting machinery.

Lifting machinery industry, the biggestmarket of the inverter application port machinery, port machinery is thehighest degree of automation industry segments, in the large shore bridge, aset of inverter 5-6 inverter; followed by General bridge crane market, althoughnot very high proportion of the application of the general bridge cranes, butsets the amount of base; once again for the tower crane market, mainly in largetower crane, tower crane export a higher proportion of applications; addition,metallurgical cranes The proportion is not small; construction elevator andparking equipment market share is still small.

Craneinverter drive overall performance has improved greatly, such as highefficiency, power factor, energy-saving effect is remarkable; simple externalwiring, wiring expenses decreased; stepless speed regulation, smooth walking;motor structure is simple high reliability, can be used in harsh environments,greatly reducing the maintenance workload and vulnerable parts, greatly improvemaintenance performance; fully functional inverter to protect themselves, suchas overcurrent, overload, overvoltage, is able to alarm and stopped, reducing thecrane failure, and to improve the safety performance. At the same time, theconverter with current limiting, soft start to reduce the impact of thestarting grid, help other workshop equipment uptime.

Crane has been of great helpin working for human use in the major areas of heat and light. All fields arein progress, the current crane put forward higher requirements, survival of thefittest, the enterprise If you want to win in the market competition, it isnecessary to promote technological change and innovation, in order to adapt tothe era of rapid development.

Crane development usuallyaccompanied by the development of the national production and construction anddevelopment, cranes as them essential in the production and constructionmachinery, play a great role in the production and construction areas or otherareas, but these areas for crane technical requirements and increasinglystringent .

Especially with thegrowing tendency of intelligent technology and automation technology matures,is also a serious challenge for the crane, the crane automation, intelligencewill develop one of the main directions. For the development of a crane, on theone hand, the degree of attention of the national energy-saving emissionreduction projects, many high consumption, high pollution and high emissionindustries, the state has been given the appropriate standard, the future craneenergy saving is an inevitable trend; another regard, it has been graduallydoes not meet the crane single, "a machine" will be graduallydeveloped, multi-functional crane development has also become an inevitableroad.

The crane, in the developed countries, need increaseresearch and development of crane design process, manufacturing process, andthe core parts. Increase the crane degree of automation, degree ofintelligence, design, energy saving, has a new look to show up and narrow thetechnology gap with foreign.

The craneduring use, often hoisting mechanism sound, lifting the phenomenon of weaknesstoday small for simple analysis under the hoisting mechanism Troubleshooting

(1) Sound hoisting mechanism. According toobserve and analyze the failure may the balancing valve, the valve is importedfrom Italy, the remote control interface is equipped with a one-way dampingcombination, the principle is to open slowly, back to the oil balancing valveon the hoisting mechanism has played a more secure protection failure may bedue to , long-term use is not timely maintenance of the hydraulic system, thedamping part of a little oil damping increase, leading to the opening delaybecomes longer, resulting in balancing valve open and lifting to brake openuncoordinated issue "when" fight tooth sound, remove the balancingvalve cleaning, assembly, adjustment, the delay to the factory, the faultdisappears.

(2) Liftingweakness. general reasons are: hydraulic motor oil outflow is too large,volumetric efficiency is significantly reduced, from or weakness; the controlcomponents relief valve drain, the system pressure do not increase, from lunable to remove the motor drain port, manipulate the hoisting mechanismobserved normal oil outflow; remove the car manifolds lifting overflow valve,check found that an O-ring minor damage, leading to the drain and pressure donot increase. Replace the O-ring; adjust the pressure to meet the design value.Hoist test work returned to normal.

Motor hoist cranes used inaddition to, like other types of cranes, with repeated short-time work, oftenstarting with load, frequently starting and braking, reversing and oftenexposed to mechanical vibration and shock characteristics, there are somesalient features .

 Ingeneral, hoist cranes small light lifting equipment, motor capacity, operationand great for ground operations, the use of exchange easy cloth squirrel-cagemotor drive unit as agencies, hoist cranes, a large prominent feature. In orderto make the structure of the agencies brake motor drive (motor) and brake(brake) into one compact, lightweight, and are generally used. With thedevelopment and improvement of brake motors, two-winding variable pole conicalrotor brake motor hoist cranes used in the current and coming period is themost ideal motor.

 Hoist crane motor, squirrel cageand wound points, cylindrical rotor with conical rotor of the points from astructural point of view, from the rise and run the motor from the point ofview of performance and use, and has a single-speed, of the points of thetwo-speed, brake way from the point of view of the mechanical brake withelectromagnetic brake, brake motors can be further broken down into a levernext to the magnetic and conical brake.

Cranemechanical brake

Provides: power-driven crane liftingmachinery safety procedures, lifting, luffing, running, rotating bodies are tobe fitted with brake. Human-driven crane hoisting mechanism and luffingmechanism must be installed brake or stopper. The main role of the brake deviceis used to prevent the suspension weights decreased to achieve the parking, andin some special cases, according to the working needs, reducing or regulatingmechanism operating speed.

Brake friction principle institutionsbrake. Brake friction parts to a certain force pressing mechanism a shaft ofthe brake wheel, resulting in the braking torque, the braking torque so thatthe mass of the object and the inertial force generated by the torque decreasesuntil both torque balance requirements to achieve speed or braking.

Crane brakeis varied. In accordance with the structural characteristics can be dividedinto blocks, belt and disc three, which block the most used. Block work state,can be divided into two kinds of normally closed and normally open. Normallyclosed brake is always in the closing state institutions work availableelectromagnet or electro-hydraulic pusher external forces to make the gate.Normally open brake contrary to this, it is often in the disengaged state, onlyexternal force is applied, in order to make it to the closing. Departure fromthe job security, the the crane working institutions should normally closedbrake.

AC induction motor is a kind of electrical energy intomechanical energy to electrical actuator.

It is mainly constituted by a stator, arotor and an air gap between them. Leading to the three-phase AC power to thestator windings generate a rotating magnetic field and the cutting rotortorque.

The three-phase AC induction motor has asimple structure, reliable, cheap, strong overload capacity, and the use,installation, easy maintenance, etc., are widely used in various fields.

Advantages:

High reliability, long life known

All motors can be directly from the mainsor inverter power supply;

Highly versatile and can provide a varietyof cooled type, protection class and various types;

Suitable for corrosive environmentalconditions and risk applications;

Outstanding motor efficiency, optimal cooling to;

Ensure low running costs;

Feeder the flexible terminal technology andall components of the mutual perfect synergy;

To ensure the safety of the entire motorsystem, reliable operation.

The inverteris an important strategy for the development of our automation road, it canspeed up the pace of our automated construction, with the continuousdevelopment of electronic technology, inverter technology is increasinglymature, has been gradually applied to various industries and industry. Atpresent, the inverter to play an increasingly important role in the craneabove, then the crane using inverter what is the advantage.

Crane use inverter drive, the overallperformance has greatly improved efficiency, energy-saving, power will besignificantly improved; external wiring will be easier wiring costs will bemuch lower; also motor high reliability, and can be used in harsh environments,greatly reducing the maintenance workload and wearing parts, greatly improvingmaintenance performance; the inverter quite complete self-protection function,overload, over-current, over-voltage are timely warning and stop, to reduce crane failure occurred, to improve thesafety performance. The drive also has current limiting, soft start can reducethe impact of the starting grid, is conducive to the normal operation of otherequipment.