Construction Machine Cab Sliding Door Guide Rail Positioning
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Solution Overview
Problem
The existing cab structures of construction machines with pipe-shaped members face difficulties in forming a recess portion for the guide rail of sliding doors, leading to a short guide portion and a narrow opening width, which restricts the movement of the sliding door.
Innovation Solution
A cab structure with a frame body formed by pipe-shaped members, including a first column portion, a beam portion, and a second column portion, where the guide portion is positioned from a first position forward of the second column to a second position rearward of the first column, allowing for a longer guide portion and supporting the sliding door with additional support members to enhance its movement and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If pipe-shaped members are disposed along the vertical direction on the front side of the doorway to form the cab structure, then the structural integrity and stiffness are improved, but the guide portion length is reduced and the sliding door opening width becomes narrow
Solution Approach 1:
The guide portion is repositioned from the front side of the doorway to the rear side, utilizing the spatial dimension behind the vertical pipe-shaped members. This dimensional shift allows the guide portion to extend rearward from the first position (rearward from the first column) to the second position (rearward from the second column) without interfering with the vertical pipe structure, thereby achieving both structural integrity and sufficient guide length
Solution Approach 2:
The guide portion is divided into multiple segments positioned at different locations: the first position is located rearward from the first column portion, and the second position is located rearward from the second column portion. This segmentation allows the guide portion to navigate around the vertical pipe-shaped members while maintaining adequate length for proper sliding door operation
2Length of moving object
If the guide portion is extended to reach the front end portion of the cab, then the sliding door opening width is improved, but it becomes difficult to form a recess portion for the guide portion in pipe-shaped members
Solution Approach 1:
Instead of extending the guide portion forward to the front end of the cab as in conventional designs, the guide portion is inverted and positioned on the rear side of the doorway. The first position is rearward from the first column portion and the second position is rearward from the second column portion, allowing the guide portion to be manufactured without requiring complex recess formations in the vertical pipe members while still achieving sufficient length
3Stability of the object's composition
If pipe-shaped members are used to form the cab structure, then the stiffness against deformation is improved, but the ability to form recess portions for guide portions is reduced compared to sheet metal members
Solution Approach 1:
The guide portion is positioned in the rear dimension rather than the front dimension, avoiding the need to form recesses in the vertical pipe-shaped members. The guide portion extends from the first position (rearward from the first column) to the second position (rearward from the second column), utilizing the rear spatial dimension where recess formation is not required, thus maintaining both the stiffness of pipe members and ease of manufacture
Data Source
AI summary
The frame body is formed by a plurality of pipe-shaped members including a first column portion, a beam portion, the front end portion of which is connected to the upper end portion of the first column portion, and a middle column member that is disposed rearward from the first column portion. The upper guide portion is provided along a beam portion in a position ranging from a first position to a second position. Here, the first position is located frontward from the middle column member and rearward from the first column portion, and the second position is located rearward from the middle column member.