Mobile Crane Self-Erection Using Hoist Rope and Linkage
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Solution Overview
Problem
The existing methods for setting up or dismantling mobile cranes require an additional crane and pose safety risks for operators due to the need to work on elevated luffing supports during the process.
Innovation Solution
A method involving an adjustable jib with a connected traction link train and hoist rope mechanism that allows for self-erection and dismantling of luffing supports without the need for an additional crane, utilizing a main hoist and connecting rod assembly to manage the luffing supports' position and transport.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an additional crane is used to erect the lower luffing support, then the luffing support can be lifted and placed on the pole, but the crane operator has to work at height (up to 6 m above ground) which creates safety risks
Solution Approach 1:
The mobile crane erects itself using its own hoisting mechanism. The lower luffing support is lifted by the crane's hoist rope wound onto the hoist, eliminating the need for an additional crane and allowing the operator to work from the ground level, thus improving safety while reducing device complexity
Solution Approach 2:
The existing hoisting mechanism of the mobile crane is used for multiple purposes: both for lifting the lower luffing support during erection and for lowering it during dismantling. This multi-functional use of the hoisting system eliminates the need for separate additional equipment
2Ease of operation
If the crane operator walks along the raised luffing support to detach the attachment means, then the additional crane can be detached, but the operator is exposed to safety risks due to working at elevated positions
Solution Approach 1:
The hoisting mechanism automatically lowers the lower luffing support after detachment, eliminating the need for the operator to manually guide it down. This automated self-service approach maintains operator safety while reducing the time required for the detachment operation
3Productivity
If the lower luffing support is lowered by hand via a rope, then it can be laid down in the transport position, but the operation is time-consuming and requires manual guidance
Solution Approach 1:
The hoisting mechanism automatically lowers the lower luffing support in a controlled manner, eliminating the need for manual guidance via rope. This automated operation significantly increases the speed of dismantling while maintaining ease of operation through the crane's existing hoisting control system
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 quicker and safer erection and dismantling of mobile cranes by eliminating the requirement for an additional crane and reducing operator risk through controlled and automated support positioning.
Implementation Method 1
By winding the hoist rope 7 onto the hoist 10, the trestle 6 begins to erect itself, the connecting rod strand 12 begins to stretch first to the right of the trestle 6, then also to the left of the trestle 6, until the lower luffing support 8 is also raised.
Implementation Method 2
The main lifting mechanism 10 continues to wind up, the traction link train 11 between the luffing supports 8 and 9 begins to stretch.
Data Source
AI summary
The invention relates to an auxiliary device for setting up the lower and upper luffing supports of an adjustable auxiliary boom, which is disposed at the head of the main boom of a mobile crane. The invention is characterized by - a set-up stand (6), which is connected to the lower luffing support (8), - a connecting rod strand (12), which can be connected to the hoisting cable (7) of the main hoisting gear (10) and - which is articulated to the tip of the lower luffing support (8), and by - a traction force member strand (11) between the lower luffing support (8) and the upper luffing support (9).