JLF electronic control

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Introduction

The electric cabinet adopts the transduser used in hoisting in Japan, and is self-designed and produced for the tower crane hoisting electrical cabinet.Since the speed regulation is step speed control, the cabinet has the advantages of good speed performance, smooth, high effciency, better overloading ability, and high energy-saving performance, and is superior to other ordinary electric control.

Temperature range:

Ambient sir temperature:+40°C~-1040°C(customers may request a special design).

Humidity:less than 95%(NO dewfall)

Altitude:

The altitude of the installation location shall not be higher than 12000M.

Power grid quality:

The line voltage fluctuation range does not exceed +10%~-5% of the rated voltage, power supply shall be assured.

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Q:type of dc motors used by electric train/subway,crane & fan.give a brief explanation to your answer?
I believe that electric trains and subways use series motors when DC motors are used because the series motor has a torque vs. speed curve that provides high torque at low speed and low torque at high speed. Since power is equal to torque times speed, that is essentially a constant power mode of operation. I believe that mode is selected because it results in a smaller and less expensive complement of power delivery equipment and more efficient operation. Although it has been many years since DC motors were used extensively for cranes, I believe that series motors were used more than other types for the same reasons stated above. However, compound or separately excited motors may have been used for better speed and torque control at low speeds. Except for heater fans in vehicles, I don't believe DC motors have ever been used much for fans. Today, permanent magnet DC motors are used for all of the little motors in vehicles including the radiator fan that was formerly belt driven by the engine. A permanent magnet motor is like a separately excited motor or a shunt motor. The optimum DC motor for a fan would probably be a shunt motor because a fan requires increasing torque as speed increases. Today, computers are cooled by brushless DC motors.
Q:what attracts Crane flys?
Crane flies are concidered mild turf pests in some place, but they don't bite people. They like prefer moist areas. So if you want to kill them you could get rid of small moist areas or also could try normal bug spray on them.
Q:Cranes everywhere in a city?
I love doing things like this! Whenever my friends go to the mall we do this. We put inspirational quotes and images everywhere we can. In the pockets of clothing, on top of the sale signs, all over the cafeteria. There isn't anything wrong with doing it, and people love it! I'm sure the cranes will be beautiful and many people will appreciate them. Be sure to write look inside on the outside of each crane if you're hiding the message on the inside! This is such a cool idea, I'd love it and I'm sure it won't even be a slight nuisance to anyone. Have fun!
Q:Why are cranes used for hanging criminals in Iran?
they probably didn't have the proper arrangements to carry out the punishment so they used cranes instead of gallows. who knows? but weird really. and it wouldn't be more painful... err... the purpose is to snap the neck... ouch :(
Q:whats the crane thing they use to lower spent fuel rods into the pools of water?
It's a crane thing. Seriously though - overhead crane, gantry or polar crane!
Q:why are siberian cranes endangered?
Wetland loss means Siberian Crane loses ground Siberian Crane Grus leucogeranus is now listed as Critically Endangered, having previously been listed as Endangered in 1994. Its population is estimated to be 2,500-3,000 and comprises three separate populations. The western population breeds in western Siberia and winters in Iran, and the central population breeds in western Siberia and winters in India. Both the western and central populations are on the verge of extinction as a result of habitat loss and hunting. The much larger eastern population breeds in eastern Siberia and winters in the lower Yangtze basin in south-east China. The main threats to this population are wetland destruction and degradation at staging areas and wintering sites caused by agricultural development and the development of oil fields. The main wintering site in China, Poyang Lake in Jiangxi Province, holds 95% of the global population but is potentially threatened by future hydrological changes resulting from the construction of the Three Gorges Dam and other dams. If the operation of these dams prevents the development of suitable winter feeding conditions for waterbirds at Poyang Lake and other wetlands, Siberian Crane and other threatened species could undergo extremely rapid population declines in the near future.
Q:What happened between Fancy and Pretty Crane on Passions?
A wild and rebellious teen, Fancy's 13th birthday party was canceled five minutes before its designated start time after she and her sister Pretty Crane stole the caterer's van and drove it halfway to neighboring Castleton. She was also pulled over by future police chief Sam Bennett at least once for driving over the speed limit and without a license (Fancy was, at the time, not of the legal age to obtain a driver's license).[1] Growing up, Fancy apparently had a sometimes competitive relationship with her sister, Pretty. According to their aunt Sheridan, Pretty brought a cute boy from their country club on the family's yacht one Labor Day, and jealous Fancy pretended to sprain her ankle so that the boy spent much of the day tending to his date's injured sister. The two apparently began dating, but Fancy broke up with him a week after once she was sure she had stolen him from Pretty. (However, Fancy denied that the event had occurred as so.) Sometime before 1999, Fancy departed Harmony for a prestigious school, either boarding or a university. She did eventually make it to college, but, according to Ivy, she has yet to complete her degree. Fancy later made her way to Italy with her sister sometime in 2004 or 2005, but the two ended up parting ways, her sister staying in Italy and Fancy heading for Las Vegas. Lately, hints have been given that Fancy betrayed Pretty, causing Pretty to leave Harmony for good.
Q:Can the tower crane personnel install the construction elevator?
As for the hoisting equipment, the licensed crane erection worker can install the construction elevator.
Q:lifting a machine with two crane and a beam?
You left out crucial information and working it out with risky assumptions takes too much work. Whatever this was supposed to mean Machin connect to beam in 3 point What is missing is whether the cranes connect to the end and the entire weight of the machine is in the middle - or is the machine attached at 3 distributed points. In addition, there has to be some condition - looking at the ASTM spec will give strength, but you have specified whether the beam is to be just at failure or 50% safety factor, etc.
Q:i want to know about the container handling cranes.weight,height,color,heat and moisture resistance,...?
You need to be more specific. The lifting capacities for container cranes varies significantly, as does any other crane. Some of the variation is based purely on load (horsepower) availability; some is based on speed (rpm) for lift/drop portions of the cycle. Cranes like these operate year-round, at ports all over the world. Some ports have average ambient temperatures in the range of 45 C, with highs up to 60 C. Others can be as low an average as 10 C, with a low peak as much as -50 C. Moisture will, over the long haul, harm them - they're metal constructs, and thus are prone to oxidation. Using corrosion-resistant materials and/or coatings will certainly prolong their usable lifespan. The crane drives (electric motors and power electronics) are also susceptible to moisture and other contaminants. All true dockside cranes require some sort of permanent foundation; it's usually part of the pier construction itself. However, there are portable cranes that operate without one. There is also more than one crane manufacturer out there - all will have their trade secrets that will make each look a little different than the rest. It will generally also reflect in their operation parameters, and in their expected life cycle.

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