Mobile Crane Angling Drive Using Telescopic Cylinder

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Solution Overview

Problem

The existing methods for angling a main jib extension on a mobile crane are complex and require external auxiliary means or additional hydraulic cylinders, making the process inefficient and requiring operation above the crane's upper edge.

Innovation Solution

The angling drive utilizes the mobile crane's existing drive energy and a telescopic cylinder to retract and extend the main jib, eliminating the need for external auxiliary means and allowing the angling to occur predominantly on the ground, with assistance from the luffing cylinder for reaching 20° or 40° positions, and employing angling plates to limit the angling and provide movement energy through a coupling rod.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If external auxiliary means or additional hydraulic cylinders are used to angle the main jib extension, then the angling function can be achieved, but the device complexity and operational complexity increase

Engineering Contradiction:

Improveangling operationVSAvoidhydraulic system complexity

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The existing drive of the mobile crane, which is provided for another task (telescopic jib extension/retraction), is made to provide movement energy for the angling drive as well. The telescopic cylinder serves dual purposes: extending/retracting the jib and angling the main jib extension by engaging on its foot. This eliminates the need for separate auxiliary hydraulic cylinders and simplifies the overall hydraulic system while maintaining the angling function.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Adaptability or versatility

If additional hydraulic cylinders are provided for angling, then the angling function is achieved, but the quantity of components and system complexity increase

Engineering Contradiction:

Improveangling capabilityVSAvoidnumber of hydraulic cylinders

Core Design Contradiction:

Adaptability or versatilityVSQuantity of substance

Solution Approach 1:

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Ease of operation

If the angling procedure requires operation above the crane's upper edge, then the main jib extension can be angled, but the ease of operation deteriorates due to difficult access and safety concerns

Engineering Contradiction:

Improveangling operation accessibilityVSAvoidoperational safety

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The angling drive engages on the foot of the main jib extension (at the lower end near the main jib head) rather than requiring operation from above the crane's upper edge. This intermediary engagement point allows the angling operation to be performed from ground level or from a safe position on the crane, eliminating the need for workers to position themselves above the upper edge while still achieving the angling function effectively.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 simplifies the angling process by using existing crane drives and eliminating the need for additional hydraulic cylinders, allowing efficient angling on the ground and reducing operational complexity, while ensuring the main jib extension can pivot against gravitational force.

Implementation Method 1

a telescopic cylinder provides the movement energy for the angling drive by retracting and extending the main jib

Methodology Applied

Scientific EffectHydraulic cylinder mechanism: Hydraulic Press

Implementation Method 2

the main jib is luffably mounted thereon and able to be raised via a luffing cylinder

Methodology Applied

Scientific EffectHydraulic cylinder mechanism: Hydraulic Press

Implementation Method 3

employing angling plates to limit the angling and provide movement energy through a coupling rod

Methodology Applied

Scientific EffectMechanical coupling: Mechanical Advantage

Implementation Method 4

the main jib extension can be raised and lowered so as to pivot about the luffing axis against the effect of the gravitational force of the main jib extension

Methodology Applied

Scientific EffectGravitation: Gravitation

Data Source

PatentUS10781083B2Mobile crane and method for angling a main boom extension in relation to a main boom of a mobile crane

Publication Date: 2020.09.22 TADANO DEMAG GMBH

AI summary

A mobile crane comprising a main boom, which is supported on the mobile crane in such a way that the main boom can be rocked and which can be put upright by means of an elevating cylinder, and a main boom extension, which is releasably connected to a main boom head of the main boom by upper and lower pins. The main boom extension, proceeding from a home position, can be angled in relation to the main boom about a rocking axis by means of an angle drive after the upper pins have been released, which angle drive acts on a base of the main boom extension, where a drive of the mobile crane provided for a different task provides the kinetic energy for the angle drive. The angle drive is designed in such that a telescoping cylinder of the main boom provides the kinetic energy for the angle drive.