Crane Erection Pulley Assembly for Single-Crane Load Rotation
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Solution Overview
Problem
Erecting elongated loads using two cranes in a tandem lift is complex and requires precise coordination, often necessitating the scheduling of a second crane, which increases costs and is not feasible at all construction sites.
Innovation Solution
A crane with an erection device featuring two independently operable winches, an upper part with first deflection pulleys, and a lower part with second deflection pulleys, allowing asynchronous actuation to pivot and rotate loads using a single crane, with modular design for varying load sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two cranes are used in a tandem lift to erect elongated loads, then the erection capability is improved, but the device complexity and coordination requirements increase significantly
Solution Approach 1:
The patent combines the functions of two separate cranes into a single crane system by integrating an erection device with multiple deflection pulleys and independently operable winches. This merging allows one crane to perform the erection function that previously required two cranes, reducing coordination complexity while maintaining erection capability
Solution Approach 2:
The erection device is segmented into multiple functional components including upper and lower deflection pulleys, multiple winches, and load-handling devices. This segmentation allows independent operation of each component to achieve the complex erection motion, simplifying control compared to coordinating two full cranes
2Adaptability or versatility
If a second crane is scheduled for erection operations, then the erection capability is improved, but the loss of time and increased costs occur
Solution Approach 1:
The single crane is equipped with a multi-functional erection device that enables it to perform both standard lifting operations and complex erection operations. This universality eliminates the need to schedule a second crane specifically for erection tasks, reducing scheduling time and costs while maintaining full erection capability
3Ease of operation
If asynchronous actuation of winches is used to rotate loads, then the ease of operation is improved, but the control precision requirements increase
Solution Approach 1:
The deflection pulleys serve as intermediaries that translate the asynchronous motion of multiple winches into controlled rotational movement of the load. The mechanical arrangement of pulleys and cables automatically coordinates the motion, reducing the need for precise electronic synchronization while maintaining ease of operation
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables safe, efficient, and cost-effective erection of large loads using a single crane, adaptable to different load sizes through modular design, and ensures safe operation by limiting cable angles to prevent damage.
Implementation Method 1
an upper part, in particular pivotally attached to the boom, with first deflection pulleys and a lower part, pivotally connected to the upper part about a horizontal pivot axis, with second deflection pulleys
Implementation Method 2
the upper part is pivotably attached to the boom, in particular about a horizontal pivot axis running parallel to the boom luffing axis, so that the erection device self-aligns due to gravity
Data Source
Figure 1
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AI summary
The invention relates to a crane (10) comprising a boom (16) and two independently operable hoist winches, on each of which a hoist cable (21, 22) guided over the boom (16) is mounted for winding and unwinding, wherein each of the hoist cables (21, 22) carries a load-handling device (23, 24) for securing a load (1). According to the invention, the crane (10) comprises an erection device (20) for erecting a load, which includes an upper part (30) pivotably attached to the boom, in particular by pivoting, with first deflection pulleys (31), and a lower part (40) pivotably connected to the upper part about a horizontal pivot axis (32), with second deflection pulleys (41) whose axes of rotation are parallel to the pivot axis (32). The lifting ropes (20,22) are each guided over a first deflection pulley (31) and a second deflection pulley (41) and are attached at their free ends to the lower part (40).The deflection pulleys (31, 41) and the pivot axis (32) are arranged such that, by asynchronous actuation of the lifting winches, a load (1) connected to both load-handling devices (23, 24) can be selectively rotated about a load rotation axis parallel to the pivot axis v(32) by performing a pivoting movement of the lower part (40) relative to the upper part (30). The invention further relates to an erection device (20) for a crane (10) according to the invention, a set comprising an erection device (20) and at least one further lower part, and a corresponding erection method.