Work Machine Boom Arm Cylinder Positioning for Folded Height
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Solution Overview
Problem
Conventional demolishing machines with super long attachments face issues in reducing the height of the work attachment in a folded state, which increases the overall height and complicates operability and transportation, and requires modifications to the cylinder positioning that affect the machine's operation.
Innovation Solution
The work machine is designed with a boom and arm configuration that allows for a three-fold folding posture, where the boom is above the inter-boom and the arm is below, with sloped surfaces and cylinder placement to minimize height and maintain stable operation, including the inter-boom and arm cylinders crossing each other and the work device cylinder positioned to avoid contact with the ground, allowing for parallel surfaces that reduce the overall height.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the work device cylinder is positioned below the arm in the folded state, then the attachment can be compacted, but the cylinder may be damaged by ground contact
Solution Approach 1:
The patent repositions the work device cylinder from a vertical arrangement (below the arm) to a horizontal arrangement (on the back side near the distal end). This dimensional change allows the cylinder to be protected from ground contact while maintaining compact folded dimensions, as the cylinder now extends horizontally rather than vertically toward the ground
2Length of stationary object
If the attachment height is reduced in folded state, then transportation efficiency improves, but the work device cylinder positioning becomes problematic
Solution Approach 1:
The cylinder is relocated from a vertical position that would interfere with ground contact to a horizontal position on the back side of the attachment. This repositioning in a different spatial dimension allows the attachment to achieve reduced height for transportation while the cylinder maintains its functional positioning without complexity
Solution Approach 2:
The patent specifies that the work device cylinder should be positioned on the back side of the work attachment near the distal end of the arm. This localized positioning ensures that the cylinder is protected from ground contact during folded storage while maintaining optimal operational characteristics during work, balancing transportation efficiency with operational requirements
Data Source
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AI summary
Provided is a work machine capable of decreasing the height of a work attachment in a folded state and suppressing the influence on the operability during demolishing operation. An arm 27 has a surface facing downward when the attachment is in a folded posture, and the surface includes a flat arm contact surface 27b capable of making contact with a mounting surface G, on which a work attachment 24 is mounted; and an attachment surface 27c that extends in the direction away from the mounting surface G. A work device cylinder 32 is attached to the attachment surface 27c so as not to make contact with the mounting surface G. When the attachment is in the attachment folded posture, the arm contact surface 27b is more parallel to a boom upper surface 25b2 than a boom-side sloped surface 25b4 and an arm-side sloped surface 27e or is parallel to the boom upper surface 25b2.