Roller Carriage for Mobile Crane Boom Assembly
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Solution Overview
Problem
The assembly and disassembly of telescopic booms in mobile cranes are complex and time-consuming, requiring large hydraulic cylinders and specialized vehicles, which are expensive and limited in use, and result in oversized hydraulic lines and high hydraulic oil requirements.
Innovation Solution
A device comprising a support device with a roller carriage and guide mechanism, allowing the boom to be moved horizontally using a drive unit, which reduces hydraulic oil volume and enables flexible use of transport vehicles for multiple purposes, with components detachably attached to the vehicle and using rollers for easy movement and positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If telescopic cylinders are used to push the boom during assembly/disassembly, then the boom can be moved, but large hydraulic oil volume and oversized hydraulic lines are required
Solution Approach 1:
The invention extracts the boom movement function from the telescopic cylinders and transfers it to a separate roller carriage system with rollers. The telescopic cylinders remain on the crane for their primary function of boom extension/retraction, while the roller carriage handles the horizontal movement during assembly/disassembly, eliminating the need for oversized hydraulic lines dedicated to movement.
Solution Approach 2:
The roller carriage acts as an intermediary device between the boom and the ground/transport vehicle. It provides rolling contact that reduces friction and enables easy movement with minimal hydraulic force, thereby reducing the required hydraulic oil volume and line size compared to direct hydraulic cylinder pushing.
2Device complexity
If specialized vehicles with integrated mechanisms are used for boom assembly/disassembly, then the process is simplified, but the vehicle is expensive and can only be used for this single purpose
Solution Approach 1:
The roller carriage is designed as a universal device that can be attached to various transport vehicles (tractors, semi-trailers) and used for different purposes. It serves both as a transport platform for the boom and as an assembly/disassembly aid, eliminating the need for specialized single-purpose vehicles.
Solution Approach 2:
The roller carriage is designed to be dynamically adaptable - it can be attached to different types of transport vehicles and configured for different boom sizes. The hydraulic system can be connected to various crane models, making the entire system versatile rather than dedicated to a single application.
3Productivity
If the transport vehicle is dedicated solely to boom assembly/disassembly, then the process is optimized, but the vehicle cannot be used for other purposes
Solution Approach 1:
The transport vehicle serves dual functions: it transports the boom to the crane site and also provides the platform for assembly/disassembly operations through the attached roller carriage. After the boom is installed, the roller carriage can be detached and the vehicle used for other transport tasks, maximizing utility.
Solution Approach 2:
The assembly system is segmented into separable components: the roller carriage is a detachable unit that can be attached to the transport vehicle when needed and removed when not needed. This allows the transport vehicle to be used for other purposes while maintaining the capability for efficient boom assembly when required.
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
Simplifies the assembly and disassembly process, reduces hydraulic oil requirements, and allows the transport vehicle to be used for other purposes, lowering costs and increasing flexibility, while ensuring precise positioning and easy handling of the boom.
Implementation Method 1
a roller carriage on which the boom can be placed and which, in particular on the side of the support device facing away from the mobile crane, is movably mounted or mountable on the transport vehicle
Data Source
Figure 1
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AI summary
The invention relates to a device for assembling and disassembling a mobile crane boom, in particular a telescopic boom, comprising a support device attached to or attachable on the mobile crane and/or a transport vehicle, on which the boom can be placed and fixed or locked; a roller carriage on which the boom can be placed and which is or can be movably mounted on the transport vehicle; and a guide mechanism attached to or attachable on the transport vehicle, by means of which the roller carriage can be actively moved parallel to the longitudinal axis of the boom. The invention further relates to a mobile crane with a device according to the invention and a method for assembling a boom mounted on a transport vehicle onto a mobile crane using the device according to the invention.