What are the benefits of flat top tower cranes, the difference between flat top towers and tower cra

Advantages of flat-top tower cranes.

Compared with the pointed tower crane with tower head and tie rod horizontal arm trolley luffing type, the stress condition and connection mode of the crane arm of the flat-top tower crane are obviously different. After the tower is erected, whether it is working or non-working, the stress state of the upper and lower main chords of the crane arm and the balance arm of the flat-top tower crane remains unchanged, the upper chord is mainly tensioned, and the lower chord is mainly compressed, and there is no influence of alternating stress, and its mechanical model is single.

1. Be concise. It is based on this that the connection design of the crane boom of the flat-top tower crane is simple, which is very convenient for quick disassembly and assembly between the arm joints. The upper chord is connected by a pin to withstand the tension, and the lower chord is connected by the end face of the joint to bear the pressure, so that the lower chord is very easy to connect with only two positioning locking pins and locking bolts.

When installing, connect the pin shaft above, and then drop the arm joint, the two lock pins are automatically in place, and the bolts can be put on, and the arm nodes are mainly connected by a large pin shaft of the upper chord, which is both labor-saving and time-saving. In addition, the flat-top tower crane has many unique advantages as follows.

1) The installation and dismantling of the flat-top tower crane is simple, easy, fast and time-saving, and the requirements for the required lifting capacity of the truck crane are greatly reduced when installing and disassembling the tower crane. Due to the cancellation of the tower head, its unit mass is small, the installation height is low, and the maximum installation height is more than 10m lower than that of the tower crane with tower head of the same level. The unique crane arm connection mode of the flat-top tower crane makes the whole boom can be disassembled and assembled in the air section by section, and the requirements for lifting equipment are greatly reduced compared with the overall hoisting of the boom in the air section by section, saving the cost of disassembly and assembly, and it is more suitable for the tower crane disassembly and assembly under the restricted conditions of the construction site and the cross operation of the group of towers.

2) The boom steel structure has a long life and high safety. The flat-top tower crane does not have a boom tie rod, and the cross-sectional size of its boom is usually larger than that of the ordinary tower crane of the same level, especially the height of the cross-section is larger, the stiffness is larger, and the buckling deformation is also smaller when lifting, and the flat-top tower crane boom is only affected by the direction of the load, which is relatively simple, and the flat-top tower crane boom is not subject to the effect of alternating stress in both vertical and horizontal directions, which greatly improves the service life and safety of the steel structure of the boom, and the deformation is small, stable and safe during operation, especially when it comes to emergency stop and rapid turn. The main stress rod of the crane arm of the horizontal arm trolley luffing tower crane with tower head and tie rod is often subjected to the action of tensile and compressive alternating stress, which is the main reason for the fatigue damage and even fracture of the crane arm and the cracking of the weld.

3) The applicability of the boom is good and the utilization rate is high. The design of the crane boom of the flat-top tower crane is easy to achieve modularization, serialization and standardization, which can reduce the design and manufacturing costs. The cross-section of the crane arm of the flat-top tower crane adopts the variable cross-section design, which can be installed and disassembled independently in the order of the section by section, and the crane arm combination of the tower crane is increased, and the same arm section can be used on different flat-top towers after modularization, and the applicability and utilization rate of the crane arm are improved.

One of the characteristics of the tower crane is to reduce the disassembly and assembly requirements, the unit mass is small, the installation height is low, and the disassembly and assembly are carried out in the air section by section, which saves costs, is safe and fast; Second, it is suitable for the cross operation of the group of towers, and the tower crane cap is canceled, and the safety is greatly improved when encountering the cross operation of multiple tower cranes; Third, there are occasions with special requirements for height, which is suitable for construction sites such as next to airports, tunnels, workshops, and high-voltage lines; Fourth, it is suitable for the construction site with changes in the amplitude of the boom, such as in high-rise buildings, where the roof is irregular or the area is too small, it is used as an internal tower climbing machine; Fifth, it is convenient for the tower crane to be assembled and disassembled under restricted conditions on the construction site, and the manual disassembly and assembly method is used to complete the assembly and disassembly of the crane arm in the air section by section; Sixth, the steel structure of the crane arm has a long life and high safety; Seventh, the applicability of the crane arm is good and the utilization rate is high; Eighth, the design cost is low, the cycle is short, and it can better meet the various needs of users.

The maximum lifting capacity is 10t, the maximum rated torque is 1600knm, the maximum working range is 60m, the maximum lifting capacity, the maximum lifting height (attachment) is 200m, and the 160 flat head piece mounted tower crane is convenient for sea transportation. The electrical appliances use German Schneider appliances and imported components. Frequency conversion speed regulation, good speed regulation performance, stable work, high working speed and efficiency, low energy consumption, reduced work impact, and small wear.

The hoisting mechanism adopts double winding motor and series speed regulation circuit to form a speed regulation system, with good speed regulation performance, stable speed change and high work efficiency. The trolley traction mechanism adopts frequency conversion speed regulation. The towing trolley luffs on the horizontal arm, and it has good safety in place.

The slewing mechanism adopts frequency conversion speed regulation. It is composed of motor, planetary gear reducer and rotary lock (brake), with high bearing capacity, stable braking, reliable work and accurate positioning. The boom part adopts a flat head design, which is easy to install and labor-saving.

Compared with the model with tower top and tie rod, it is easier to change the working amplitude, and it is safer and more reliable in use.

There will be no meeting in the tower crane group, which can save the standard section.

The lack of a tower head and tie rod is the most significant structural feature of the flat-top tower crane, which is also the origin of the name of the flat-top tower. Because of this special structural form, the flat-top tower has a qualitative difference with the tower crane with the tower head, which also determines the unique advantages and disadvantages of the flat-top tower.

Compared with the horizontal arm trolive tower crane with tower head and tie rod, the stress condition and connection mode of the flat-top tower boom are obviously different. After the tower is erected, whether it is working or non-working, the stress state of the upper and lower main chords of the flat-top tower crane arm and the balance arm remains unchanged, the upper chord is mainly tensioned, and the lower chord is mainly compressed, and there is no influence of alternating stress, and its mechanical model is single.

1. Be concise. It is based on this, the connection design of the flat-top tower boom is more simple, and it is very convenient for the rapid disassembly and assembly between the arm joints, and most of the modern flat-top tower boom adopts the space truss structure of the regular triangular cross-section, and this stress condition is mainly considered. The upper chord is connected by a pin to withstand the tension, and the lower chord is connected by the end face of the joint to bear the pressure, so that the lower chord is very easy to connect with only two positioning locking pins and locking bolts. When installing, the pin shaft on the top is connected, and then the arm section is dropped, the two locking pins are automatically in place, and the bolts can be put on, and the arm nodes are mainly connected by a large pin shaft of the upper chord, which is both labor-saving and time-saving, which is one of the characteristics of the flat-head tower crane.

Greatly reduce the requirements of the lifting capacity of the required lifting equipment for the tower crane. Due to the cancellation of the tower head, the flat-top tower crane has a small unit mass and low installation height, and the maximum installation height can be reduced by more than 10m compared with other tower cranes of the same level. When the ordinary tower crane installs the boom, the boom and the tie rod must be connected on the ground and then hoisted as a whole, and the requirements for the lifting equipment are the highest at this time, and there must be a large lifting capacity and lifting height.

Because the arm root pin is connected, the boom needs to be raised a lot to connect the boom tie rod, and the safety accident is easy to occur when installing the boom tie rod, while the flat-head tower installation is completely improved.

Flat-top cranes are less common and relatively safer.

Zoomlion tower cranes are notoriously difficult to open! It's good to get used to it, the inverter is very inhumane, and especially when the inverter parameters are not well debugged, many drivers say that it is difficult to drive.

Skilled workers, practice makes perfect, steady, take your time, can't come up and want to open quickly. The hanging material is dangling to that side, and the "big arm and trolley" are followed to that side, and it is stable. I wish you a speedy success.

Flat-top crane is generally a frequency converter, his characteristic is that the start is slow, if it is a large swing distance, it is best to go to 3 gears at a time, this is suitable for large-scale swing; There will be a pause in the swing arm below 2nd gear, which is suitable for small swings; If it's not far away, use 1st gear to jog, and when you stop, there will be a turn, and if you are swinging to the left and stopping, you will turn a little bit to the right, so you can click to the left when it is about to go back.

The working space is large, mainly used for the vertical and horizontal transportation of materials and the installation of building components in housing construction.

It is composed of three parts: metal structure, working mechanism and electrical system.

Founded in 1995, Crane Group is mainly engaged in the R&D, production, sales, installation and leasing services of tower cranes and construction hoists, and can produce a full range of tower cranes below 1100 tons of meters, flat heads, booms, back-to-base tower heads, sheet mounts, and walking types.

Since its establishment in 1995, Crane Group has been determined to innovate and develop rapidly, and has been widely recognized and praised by all levels of society, all walks of life and customers, and has been rated as China's most growing enterprise, China's top 50 lifting and transportation machinery industry, 50 high-growth high-tech enterprises in Henan Province, and one of the top ten innovative enterprises in the Central Plains.

Boom tower crane and cantilever tower crane have their own advantages:

The lifting moment of the boom tower crane is large, the lifting capacity of the single rope is large, the rotation speed is slow, and the translation of the hanging object is relatively stable, which is generally used in the construction of steel structure.

The cantilever (flat-headed) tower crane is no different from the spire tower crane, and the advantage is that the height difference is better when the tower group is operating.

The advantage of boom crane is that it does not pass through other people's buildings or other buildings.

The disadvantage is that the arm length is lower than the utilization rate of the same model.