Crane Boom Hoisting Device Mast Separation
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Solution Overview
Problem
The removal and mounting of masts or gantries in cranes are cumbersome and time-consuming due to the need to handle and rethread hoisting wire ropes, which complicates the process of dismantling and reassembling the crane for transport.
Innovation Solution
A crane boom hoisting device with a winch installed on the mast or gantry allows for the separation of the mast or gantry from the body frame without needing to remove the hoisting wire rope, enabling easy removal and installation by utilizing a mast-side or gantry-side spreader and a hoisting winch to manage the rope.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the hoisting wire rope is threaded through the mast or gantry for boom hoisting, then the boom can be raised and lowered, but the removal and mounting of the mast or gantry becomes troublesome and time-consuming
Solution Approach 1:
The hoisting system is divided into separate functional components: the wire rope remains fixed to the body frame, while the mast or gantry with the spreader can be independently removed. The winch is positioned such that it can operate with the wire rope without requiring the rope to be threaded through the mast/gantry structure itself.
Solution Approach 2:
The troublesome aspect of threading the wire rope through the mast or gantry is extracted and eliminated. The wire rope is instead directly connected to the body frame and winch, separating the hoisting function from the mast/gantry structure, allowing them to be removed independently without handling the rope.
2Ease of operation
If the wire rope is pulled out from both spreaders for mast or gantry removal, then the mast or gantry can be separated from the body frame, but the work becomes very troublesome and requires a long time
Solution Approach 1:
The complex wire rope handling procedure is extracted and eliminated. The wire rope is designed to remain fixed to the body frame while the mast or gantry is removed, eliminating the need to pull the rope from spreaders and avoiding the complexity of rethreading it during reassembly.
Solution Approach 2:
The wire rope is preliminarily positioned and fixed to the body frame in a predetermined location, eliminating the need for complex handling during mast or gantry removal. The rope is already in place to engage with the winch without requiring manipulation during disassembly.
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 configuration simplifies the removal and mounting process by eliminating the need to handle the hoisting wire rope, reducing the time and effort required for dismantling and reassembling the crane, thereby facilitating more efficient transport and setup.
Implementation Method 1
a raising/lowering winch adapted to unwind and wind the hoisting rope to raise and lower the mast and the boom
Implementation Method 2
a mast-side spreader provided at the front end portion of the mast, a frame-side spreader removably mounted on the body frame side, with a hoisting rope being stretched between and spread on both frame-side spreader and the mast-side spreader
Data Source
AI summary
A boom hoisting device comprising a mast having a pivotable front end portion connected to a front end portion of a boom through a guy line, a mast-side spreader provided at the front end portion of the mast, a frame-side spreader removably mounted to an upper rotating body and with a hoisting rope being stretched between and spread on both mast-side spreader and frame-side spreader, and a hoisting winch adapted to unwind and wind the hoisting rope to raise and lower the mast and the boom, the hoisting winch being mounted to the mast so that the mast and the hoisting winch are together removed from the upper rotating body by separation of a base end portion of the mast from the upper rotating body.