Telescopic Crane Auxiliary Lifting Device for Vertical Load Handling
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Solution Overview
Problem
Telescopic cranes face limitations in lifting loads located under the fixed member due to restricted height clearance and difficulty in achieving a purely vertical lifting trajectory, often resulting in curved trajectories that risk impacting the vehicle's body.
Innovation Solution
An auxiliary lifting device with a housing containing a transverse return pulley and an optional bypass pulley is integrated into the telescopic boom crane, allowing the sling to pass over the pulleys to facilitate vertical lifting and lowering of loads by sliding the movable member, enabling precise control of the load's movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the crane's boom is raised to a near-vertical position to lift a load located below the fixed arm, then the load can be lifted, but the lifting clearance is limited and the boom may not reach the load due to structural restrictions or vehicle surroundings
Solution Approach 1:
The lifting function is segmented into two independent systems: the telescopic boom for horizontal reach and the auxiliary lifting device for vertical lifting. The auxiliary device with pulleys and sling separate the vertical lifting function from the boom, allowing the boom to remain horizontal while the load is lifted vertically by the auxiliary mechanism.
Solution Approach 2:
The auxiliary lifting device acts as an intermediary between the boom and the load. It includes a housing attached to the boom, pulleys for redirecting the sling, and a mechanism that converts horizontal boom movement into vertical load lifting, eliminating the need for the boom to achieve near-vertical positions.
2Ease of operation
If the crane pivots in position to lift the load, then the load can be lifted, but the load follows a curved trajectory that risks impacting the vehicle body
Solution Approach 1:
The movement is segmented into independent horizontal (boom rotation) and vertical (auxiliary lifting device) components. The auxiliary lifting device with its pulley system decouples the vertical lifting motion from the horizontal pivoting motion, enabling purely vertical load trajectories regardless of boom orientation.
Solution Approach 2:
The pulley system in the auxiliary lifting device serves as an intermediary that transforms the horizontal pulling force from the boom into vertical lifting force on the load. This intermediary mechanism ensures the load moves vertically while the boom can pivot horizontally without affecting the load's trajectory.
3Object-affected harmful factors
If the operator combines slewing movement with translational movement of the crane's moving limbs to achieve a purely vertical trajectory, then the load can be lifted vertically, but the operation becomes particularly difficult to achieve
Solution Approach 1:
The control system segments the boom's telescopic sections into independent controllable elements. Each section can be extended or retracted independently, allowing precise control of the auxiliary lifting device to achieve purely vertical load trajectories without requiring complex coordinated movements of multiple boom sections.
Solution Approach 2:
The auxiliary lifting device incorporates dynamic control of the movable member's extension and retraction, allowing real-time adjustment to maintain purely vertical load trajectories. The system adapts the telescopic sections' movement dynamically to compensate for any deviations and ensure vertical lifting regardless of boom orientation.
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
This solution allows for safe and easy handling of loads under the fixed member with a strictly vertical movement, overcoming the limitations of restricted height clearance and curved trajectories, ensuring accurate placement without horizontal movement during lifting and lowering.
Implementation Method 1
containing at least one first pulley, called a return pulley, with an axis transverse to a direction of sliding of the boom
Data Source
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AI summary
The invention relates to a crane with a telescopic jib and to a method for handling using such a crane. The crane (10) with a telescopic jib (1) comprises a fixed member (2) inside which at least one mobile member (4) slides. It is characterized in that it bears an auxiliary lifting device (5) which comprises a housing (7) fixed to the fixed member (2) of the jib (1) and above a load (20) that is to be lifted, and which contains a first pulley (8) termed deflection pulley (8), the axis of which is transverse to the direction of sliding of the jib (1). The auxiliary lifting device (5) also comprises a sling (6), fixed by one end to an attachment point (15) located at one end of the mobile member (4), and fixed by its other end to the load (20) that is to be lifted. The sling (6) thus passes over the deflection pulley (8) so that the sliding of the mobile member (4) brings about, via the sling (6), the vertical lifting or lowering of the load (20).