12T topless tower crane with CE ISO certificate

12T topless tower crane with CE ISO certificate

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Loading Port:: China main port

Payment Terms:: TT OR LC

Min Order Qty:: 1 set

Supply Capability:: 100 set/month

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Descriptions of our tower crane:

1, QTZ250 have competitive price and excellent quality, suitable for all kinds of construction project and can work under all kinds of work condition. With their working radius from 3.15m to 70m, QTZ250 tower cranes are famous for their large operating ranges, varied working methods and wide uses.

2,This series of tower cranes has a horizontal jib frame, a jib-trolley radius-changing mechanism and a hydraulic self-raising mechanism.

3, It is original in design, reliable in operation and satisfactory in shape.

4,Equipped with all necessary safety devices, these cranes show a good speed-control capacity,, satisfactory operating stability and high work efficiency.

5,They are widely applied for the construction of high-rise hotels, resident buildings, high-rise industrial buildings, large-span factory buildings and tower like buildings like tall chimneys. Best after sales service will be offered which will get rid of all your worries in the purchase of our products

Advantage of our tower crane:

1, boom relief Angle is big, greatly widened the equipment capacity and scope of work.

2, suitable for the group of tower cross homework.

3, boom stability is good, combination amplitude range.

4, suitable for height have special requirements occasions construction.

5, lifting capacity big, effectively solve the high steel structure construction team crane big lifting capacity requirements.

Specification of our tower crane:

12T topless tower crane with CE ISO certificate

Q: how tower crane extend it heights?: A tower crane is actually physically attached to the structure it is helping to build. As the building goes up, they raise the tower crane using a series of jacks that are attached to the floors, so the crane can go as high as the building does.

Q: what can lead tower crane to blank out?: （1） tower crane has crack; （2）Brake block friction lining wear up to 50% ofRaw material thickness ; （3）Brake wheel surface wear reaches 5mm ~ 2mm （4）Spring has plastic deformation; （5）Lever system, air travelis more than about 10% of its rated trip

Q: What are the characteristics of a tower crane?: Two, according to the structure characteristics of the boom can be divided into the pitching amplitude boom (boom) and trolley jib tower crane (arms).Luffing jib tower crane luffing jib by lifting does not achieve the amplitude, the utility model can give full play to the effective height of the boom, simple mechanism.Trolley jib tower crane is installed on the level of the boom on the track trolley achieve amplitude, the utility model has the advantages of large amplitude range, trolley can near the tower, can load amplitude, the shortcoming is: the boom stress on the structure of complex, high requirements, and the boom and the car must be in the building the upper part of the spire, the installation height should be higher than the roof of buildings 15-20 meters.Three, according to the turret structure, the rotation mode can be divided into lower slewing (turret rotation) and upper slewing (turret not slewing) tower crane.Under the rotary tower crane slewing bearing, balance weight mechanism are arranged on the lower end of the main tower, its advantages are: less bending, low gravity, good stability, convenient installation and maintenance, the disadvantage is the higher requirement to the slewing bearing, installation height is limited.The slewing tower crane is characterized in that the slewing bearing is balanced and the main mechanisms are arranged at the upper end, and the advantage of the utility model is that the lower part of the tower body can be simplified, and the lifting and the adding of the joint can be simplified because the tower body is not turned. The disadvantage is: when the building exceeds the tower height, due to the influence of the balance arm, limit the slewing of the crane, at the same time, the center of gravity is higher, the air pressure increases, the weight increases, so that the total weight of the whole machine increases.

Q: Tower crane four limit, two insurance, two insurance what is that?: Four limit: torque, ultra high, variable amplitude, walking limit device. Two insurance: hook insurance and reel safety device.

Q: I know this is a longshot someone will know what I'm talking about... but I just got a flash memory of a poem where a bird with long legs (I believe cranes, but it could have been flamingos or some other bird) and kids threw stones at them and their legs just snapped.... that's all I can remember, but I remember whatever the line was describing the legs snapping really well because it was in such sharp contrast to the rest of the poem.... anyone have any clue what poem this is?: The Crane and The Crow'-Aesop's fables The farmer threw the stone at the crane and broke both his legs. The injured crane said to the crow, What has become of your God-given prophecies? Why didn't you warn me that his was going to happen?

Q: Last week, I decided to make 1000 paper cranes as a new project. I am very craft- oriented, and have made numerous knitted scarfs, crocheted blankets (still in the works), and cross stitch patterns for family members. I have made 2 large cross stitch patterns, one for my grandma (took me 2 years to do) and one for my dad (2 months). My mom's birthday is coming up, and I was wondering if I should give her 1000 paper cranes as a present? I haven't yet given her anything that I made, and I feel bad about it. I don't have enough time to cross stitch a pattern or anything, and I can easily make 1000 by December. Would it be a sentimental present? Should I do it? Would she like it? If not, what should I get her? I want it to be something that I made so that it will be personal.: Lol if you *really* want to be crafty... Get a spring (Or several) Glue it to the bottom of a box. Then glue a cardboard piece on top. Then put something heavy... (For example, a glass crane, shoudn't cost much) and put all the paper cranes under it. Then... when she opens the present and takes the glass one out the paper ones will fly everywehre :D

Q: the question is :Two cranes can unload a ship together in 15 hours. The faster crane takes 16 hours less than the slower crane, if each were to unload the same ship alone. How long doesi t take for each crane to unload this ship? I done most of the math but i am stuck with this last part .15+- radical 1185/2: No. of hours for the slower to unload alone—x: 1/x + 1/(x - 16) = 1/15 (x - 16 + x)/(x? - 16x) = 1/15 15(2x - 16) = x? - 16x 30x - 240 = x? - 16x x? - 46x = - 240 x? - 23x = - 240 + (- 23)? x? - 23x = - 240 + 529 (x - 23)? = 289 x - 23 = 17 x = 40 No. of hours for the faster to unload alone: = 40 - 16 = 24 Answer: slower crane, 40 hrs; faster crane, 24 hrs Check: = 15(1/40 + 1/24) = 15([3 + 5]/120) = 15(8/120) = 15(1/15) = 15/15 or 1

Q: Tower crane and construction hoist service life? What are the norms and standards? How to detect?: The tower crane service, QTZ40 state (including 40) the following ten years, more than QTZ63, the age of fifteen years, the construction elevator used for ten years; but specific to various provinces and cities are different, such as Jiangsu Province, the 40 tower crane can be used 8-10 years, QTZ63 tower crane used for 15 years, 8 years of construction hoist. Of course, we should not blindly look at the provisions, tower cranes and the use of strength sometimes determines the life of it!

Q: Before the Advent of the Railroad Steam Recovery Crane Car (pictures below), how were Locomotive Steam Engines recovered after a derailment from the 1830's to the 1890's?: Block and tackle. Some disassembling required. Consider this Stonewall Jackson raided Grafton WV and took several locomotives over land to a southern rail head. The special equipment was developed due to increased engine size. When steam cranes were/are used temporary tracks are laid at the wreck site for several reasons. one of which is to get equipment in and the other is to haul the wreckage out. The actual number of cranes required depended on the engine/s in the wreck, location on the wreck, skill of the operators and extent of damage. If the locomotive was damaged to much, it might be cut up. If the location was too difficult for recover, they were abandoned or buried. Rumor has it that there are several locomotives left at the bottom of slides awaiting for some one with enough money to recover them for restoration. Like the story of legend concerning a 1953 Corvette in a old barn. Hope that answers all your questions.