Black Technology of Crane Boom Knuckle: Why Can It "reduce The Bone" for Operation?

In the field of construction machinery, folding boom cranes are changing the traditional way of hoisting operations with their unique "deformation" capabilities. Today, we reveal this cutting-edge technology that enables cranes to achieve the "bone reduction function".

I. Core Principle: Hydraulic Folding System

The core lies in its exquisite three-section folding arm structure. The base section is welded with high-strength steel plates and bears the main force. The middle section is equipped with a hydraulic cylinder telescopic module. The end section is a hook support that can rotate 270°. This design realizes the flexible folding of the arm section through the control of the hydraulic oil circuit.

Compared with traditional straight boom cranes, the minimum working radius of folding boom cranes can be reduced to 1.2 meters (after folding), while that of straight boom cranes is 3.5 meters. In terms of roadway passability, the folding boom type can operate in narrow alleys of only 2.1 meters, while the straight boom type requires more than 4 meters of space. The transfer efficiency is a world of difference. The folding arm type can automatically retract its arm within 30 seconds, while the straight arm type requires disassembly and hoisting.

Ii. Technological Breakthroughs: Five Innovative Designs

Double hinge joint technique

Adopting Swedish SKF bearings, a flexible compensation of ±5° was achieved, successfully avoiding the ventilation duct during the construction of a certain underground pipe gallery.

Intelligent counterweight system

Equipped with a microprocessor for real-time load monitoring, it will automatically limit the extension Angle when the 4-ton load is full to ensure operational safety.

Compact folding form

After folding, it only occupies a space of 2.3×1.5 meters, while a straight-boom crane of the same tonnage requires a 6-meter parking area. This difference is particularly crucial in space-constrained operation sites.

Iii. Practical Application Cases

In the installation of steel structure workshops, when faced with the problem that the beam spacing is only 2.4 meters, the folding boom crane can easily extend into the gap to complete the hoisting. When ships are being repaired, traditional cranes need to disassemble the hatch doors, while the folding boom type can directly extend through the inspection opening for operation. What is even more impressive is that in a certain earthquake rescue operation in 2023, the folding boom crane successfully lifted the rescue equipment within the narrow Angle of the collapsed building.

Iv. Key Points for Use and Maintenance

Regular lubrication of the hinge points (recommended twice a month) and no-load testing of the folding function before operation are the keys to maintaining the equipment in good condition. It should be noted that the height of the outriggers should be adjusted within a 30° slope. At the same time, remember not to force fold them when they are not unlocked, not to rewind the arms when overloaded, and not to store them outdoors in rainy days (the waterproof rating of the hinge point is IP54).

V. Market Feedback and Outlook

According to user data feedback, the average construction efficiency has increased by 42% after using the folding boom crane, and the failure rate is only 0.7 times per thousand hours, which is much lower than the 1.8 times per thousand hours of the straight boom crane. Market data also shows that the market growth rate of folding boom cranes reached as high as 67% from 2020 to 2023, demonstrating a strong development momentum.

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