L68D Mast Section For Tower Crane Masts

Products Specification

Type , Model: L68D 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.

L68D Mast Section For Tower Crane Masts

Tower Crane Knowledge sharing：

Scale Requirements for Track and Foundation Installation in Self-Inspection of Tower Hang Device
In this paper, based on the research and production experience of Tower hoist, we discuss with you the problem of the scale requirements for tower hoist track and foundation installation in the self-inspection of Tower hoist device.
Scale Requirements for the Stair Track and Foundation Installation in the Self-Inspection of the Stair Sling Device
1. The stop installation and buffer at the end of the walking track are fully installed and effective.
2. The stop device after the stop of the walking limit is not less than 1 meter.
3. Wind clamping is effective.
4. The gap between the clearing board and the track should not be greater than 5mm.
5. Support on the roadwood or road base box, the two sides of the rail joint position are not less than 1.5 meters staggered; The gap is not more than 4mm and the height difference is not more than 2mm.
6. The gauge error should not be less than 1/1000 and the maximum should be less than 6mm; The adjacent two spacing is not more than 6 meters.
7. Drainage facilities and other facilities are unimpeded, and there is no water on the roadbed.

The function, structure and working principle of lifting weight limiter

L68D Mast Section For Tower Crane Masts 
Tower crane is a large lifting equipment, installed with a limiter and other safety devices, can effectively reduce the incidence of tower crane accidents.

In this paper, the function, structure and working principle of the weight limiter around the tower will be explained and analyzed. Some of the content was arranged on the network. If you have any questions, we would like to discuss them together.
1. Act as a weight limiter:
When the lifting load exceeds the rated load, the lifting weight limiter can output the electrical signal, cut off the lifting control loop, and can issue an alarm to prevent the tower from overloading.
The existing national standard "Safety Regulations for Tower Cranes" stipulates that tower cranes should be equipped with weight limiters. If a weight display device is installed, the numerical error should not exceed 5 % of the actual value.

L68D Mast Section For Tower Crane Masts

When the maximum rating of the starting weight is greater than the corresponding block and is less than 110 % of the rated value, the power supply in the ascending direction of the lifting mechanism shall be cut off, but it may be used as a motion in the descending direction.
2. Construction and operation of the lifting weight limiter:
At present, the most commonly used weight limiter is a force measuring ring type. It consists of a force measuring ring, a guide pulley, and a limit switch.

It is characterized by compact size, good performance and easy adjustment. FO/23B, QT80 and other towers are generally used in various forms of this structure. A section of the force measuring ring is fixed on the support of the tower crane mechanism, and the other end is fixed on the guide pulley.
Working principle: tower lifting heavy lifting, pulley by the joint action of steel wire rope, the force passed to the measuring ring, measuring the deformation of the ring and load into a certain proportion.

Depending on the lifting load, the pulley will also have different force sizes. The shell of the measuring ring is deformed with the force, and the metal plate in the measuring ring is fixed with the shell of the measuring ring, and it extends with the deformation of the shell.

At this time, according to the load situation, the adjustment bolt fixed on the metal strip is adjusted. And the limit switch distance, When the load exceeds the rated lifting weight, the limited-position switch is moved so as to cut off the power supply of the lifting mechanism and achieve the purpose of limiting the lifting weight overload.

L68D Mast Section For Tower Crane Masts

The time interval, maintenance steps and maintenance requirements of the tower crane overhaul are summarized below.

After a long period of operation, the tower crane will undergo major repairs. The maintenance steps and maintenance requirements of the tower crane will be strictly in accordance with the regulations.

ln this article,  according to the overhaul of the tower crane products of the factory, the time interval, maintenance steps and maintenance requirements of the tower crane overhaul are summarized as follows.
The maximum repair interval for tower cranes should not exceed 15,000 hours. The maintenance steps and maintenance requirements are as follows:
1. All detachable parts of the tower crane shall be removed, cleaned, repaired or replaced(unless the manufacturer has special requirements)
2. Derust, paint.
3. Lube oil should be replaced
4. All motors shall be disassembled, disassembled and repaired.
5. The instrument used on the tower shall be repaired, inspected or replaced in accordance with the relevant regulations.
6. Replace aging wires and damaged electrical components.
7. Check the cable or puller of the arm frame.
8. When the overhaul is delivered, the tower crane shall achieve the working performance of the product when it is delivered, and shall have supervision and inspection certificate.