L68B3 Mast Section For Tower Crane Masts

products Specification

Type , Model: L68B3 Mast Section For Tower Crane Masts

Size: 2mx2mx3m 

Materials: Q345B

Within: Pins, bolts, Ladder, Platform

Process: Blasting derusting, 

Painting:  Under painting , Middle painting, Surface painting.

Our factory produce and supply almost all famous brand tower crane :Mast section, Anchor Frame, Fixing angle ,Adaptor and so on as good quality and price.

L68B3 Mast Section For Tower Crane Masts

Tower Crane Knowledge sharing：

The knowledge of preventing the tower from falling, I hope it is worth your attention and reference.
In recent years, tower cranes have been widely used for their excellent lifting and transportation properties.

At the same time, tower cranes fall and collision accidents are also common, and tower cranes in high-altitude operations often weigh from several tons to dozens of tons. Once they fall, they will be bound to People and property cause major losses.

First of all, the tower to prevent falling should pay attention to the stability of the foundation. The bearing capacity of the foundation shall not be less than 0.2 MPA. The foundation shall be made of 3:7 gray-earth compaction treatment and be equipped with steel bars of sufficient strength and diameter.

L68B3 Mast Section For Tower Crane Masts

Only a solid foundation can truly guarantee that the tower machine will not be dragged down by heavy weights during the operation, thus curbing the danger to the maximum limit.
Second, during construction, a wall should be established.

The wall should be larger than the radius of the tower suspension rotation, and warning signs such as cordon and alert lights should be set up in the area where the tower hanging may cross, and unrelated personnel should be strictly prohibited from entering.

When lifting objects in the tower, there should also be a special person responsible for the command. When not lifting objects, the hook should be raised to a distance of 2 to 3 meters from the lifting arm.

L68B3 Mast Section For Tower Crane Masts

Third, the project manager should conduct technical clearance to the safety officer, the safety officer should carry out technical clearance to the tower crane driver.

The tower is to be inspected and managed daily, and detailed records must be left after repairs and maintenance. As far as possible, the phenomenon of single bicycle operation tower lifting is eliminated. A professional tower crane conductor must be deployed.
Finally, due to the wide variety of construction conditions in various places, the main technical standards must not be compromised.

L68B3 Mast Section For Tower Crane Masts

They include: the distance between the moving part of the tower parts and the building must not be less than 0.5 meters; When the tower is installed, the vertical degree of the tower machine must not exceed 4 per thousand; The tightening torque of various bolts reaches the specified value, and all opening pins are well completed and effective.

What are the steel-speed adjustment methods of Tower lifting mechanism? What are the characteristics of each?
What are the steel-speed adjustment methods of Tower lifting mechanism? What are the characteristics of each?
1. Rotor string electronic speed regulation of winding motor
This kind of speed regulation can change the speed of the motor by connecting the variable resistor in series in the rotor winding, and using the operation handle to send the main signal to control the contactor

so as to switch the resistance to change the speed of the motor, so as to achieve the requirements of smooth start and uniform speed regulation. Some winding motor rotor string electronic speed adjustment, but also can increase the electromagnetic shift gear reducer,

this way can use speed adjustment to double the number of stops.

L68B3 Mast Section For Tower Crane Masts

2. Double speed winding rotor string resistance speed adjustment
The motor has two kinds of pole logarithm, which are regulated by two ways: string resistance and pole change.
3. Double motor drive speed adjustment
This kind of speed regulation application is to use two winding type motor drive. The two winding motors are connected by a gear with a speed ratio of 1:2, one as a drive motor, and the other as a brake motor.

Double motor speed adjustment can also be driven by a winding motor plus a cage motor or two multi-speed cage Motors, which can obtain different speed regulation characteristics.

This lifting mechanism can speed up during load movement, and can achieve airborne descent at maximum speed, thereby improving production efficiency, lifting can be accurately in place, work smoothly, and have a large speed range of 1:40.

However, the mechanism is relatively complicated, and its transmission parts need to be specially designed and manufactured. Mainly used in large and medium-sized tower hanging.
4. Variable speed regulation

By changing the extreme number, the rat cage motor can obtain the working speed of the upper and lower gear and the slow positioning speed of the first gear.

Basically, it can meet the speed regulation requirements of the tower crane and simplify the mechanism. However, the impact of the gear shift is large, and the speed regulation range is 1:8. About,

L68B3 Mast Section For Tower Crane Masts

And can not run at low speeds for a long time. It is mainly used for light and small tower cranes below 40t.m. The variable pole speed adjustment can also be added to the electromagnetic shift reducer to double the number of speed adjustment gear.

This speed adjustment is mainly applied to the tower crane with lifting capacity of 450-900 kN.m.