Crane Arm Dead Position Overcoming Assembly
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Solution Overview
Problem
Conventional cranes face challenges in overcoming dead positions between primary and secondary parts of their operational arms, particularly when the parts are aligned at approximately 180°, as existing solutions either require additional complex components or result in undesired ground movement, damaging urban areas.
Innovation Solution
A crane with a dead position overcoming assembly featuring a rotational driving means and a clutch mechanism, comprising a hydraulic cylinder with equidistantly spaced protrusions and slopes, and a crank mechanism, which allows for synchronized rotation and torque transmission to pivot the secondary part relative to the primary part, enabling effective torque generation without additional external components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a hydraulic cylinder is used to pivot the operational arm parts, then the arm can be adjusted to desired positions, but it cannot overcome dead positions where the pivot point lies on the line extending through the cylinder attachment points
Solution Approach 1:
The patent merges the hydraulic cylinder with a rotational driving means by integrating the piston rod into the drive mechanism. The cylinder casing and piston rod form a unified assembly that combines linear hydraulic motion with rotational movement, allowing the system to overcome dead positions while maintaining the simplicity of hydraulic actuation.
Solution Approach 2:
The patent introduces a rotational driving means as an intermediary mechanism between the hydraulic cylinder and the operational arm parts. This intermediary converts the linear motion of the hydraulic piston into rotational motion, enabling the system to navigate dead positions where direct hydraulic pivoting fails.
2Reliability
If additional hydraulic cylinders are mounted to overcome dead positions, then the arm can be pivoted from initial positions, but the device complexity increases
Solution Approach 1:
The patent combines multiple functions into a single integrated assembly. The hydraulic cylinder is merged with the rotational driving means, eliminating the need for separate additional cylinders and reducing overall device complexity while maintaining the ability to overcome dead positions.
Solution Approach 2:
The integrated rotational driving means serves multiple functions: it acts as both the hydraulic actuator and the rotational drive mechanism. This multi-functional design eliminates the need for separate components, reducing complexity while achieving reliable dead position overcoming.
3Shape
If the operational arm parts are aligned at approximately 180°, then the crane maintains a compact appearance, but the hydraulic cylinder cannot generate sufficient torque to pivot the parts
Solution Approach 1:
The rotational driving means acts as an intermediary that decouples the torque generation from the hydraulic cylinder's line of action. By converting linear hydraulic force into rotational motion through the integrated mechanism, sufficient torque can be generated even when the arm parts are aligned at 180° and the cylinder cannot provide direct rotational leverage.
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 efficient overcoming of dead positions without damaging the ground, maintaining the crane's appearance and functionality, and simplifies maintenance by integrating the mechanism within the existing structure, ensuring reliable operation and reduced complexity.
Implementation Method 1
a hydraulic cylinder with a piston, so that the casing of the cylinder is attached to one part of the arm and the piston inserted therein together with a piston rod is attached to the other part of the operational arm
Implementation Method 2
a rotational driving means and a mechanism, which is suitable for attachment of that part of a hydraulic cylinder for pivoting of the secondary part relatively to the secondary part of the operational arm
Implementation Method 3
said casing is furnished with protrusions, which are in the circumferential direction equidistantly spaced apart from each other and each of them is furnished with two axially outwards converging slopes, and on the other hand also the central part is furnished with protrusions
Implementation Method 4
enabling effective torque generation without additional external components
Data Source
AI summary
A crane apparatus with an integrated assembly for overcoming each dead position between primary and secondary parts of its operational arm includes a bearing framework attached to a chassis and is furnished with at least two telescopic supporting legs that are vertically arranged, and a bearing mast that is connected with the bearing framework, and an operational arm is attached in a pivot point and pivotable around a horizontal axis. The operational arm includes a primary part and a secondary part that are pivotally connected with each other. The secondary part is pivotal around the horizontal axis connected with the primary part of the operational arm via a dead position overcoming assembly that includes a rotational driving subsystem as well as a mechanism that is attached to part of a hydraulic cylinder for pivoting relative to the secondary part of the operational arm.