Construction Cab Roll Screen for Solar Shielding
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Solution Overview
Problem
Existing sunshade devices for construction machines fail to shield solar radiation entering from the front window simultaneously with opening the window, which can hinder work due to dazzling effects.
Innovation Solution
A cab design for construction machines incorporating a roll screen with a winding member and holding means, allowing the screen to be positioned behind the front window glass at the closing position and in front of it at the opening position, enabling the screen to be held and pulled out without hindering the window's movement, thus shielding solar radiation at any window position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the front window is opened for ventilation, then air circulation is improved, but solar radiation enters causing dazzling
Solution Approach 1:
A roll screen is introduced as an intermediary element between the external environment and the cab interior. The screen can be deployed to block solar radiation while allowing the front window to remain open for ventilation, thus mediating between the conflicting needs of air circulation and radiation protection
Solution Approach 2:
The solar protection function is segmented from the window structure itself and implemented through a separate roll screen mechanism. This allows independent control of ventilation (window position) and solar radiation protection (screen deployment), resolving the contradiction between these two functions
2Object-affected harmful factors
If a sunshade device is installed to block solar radiation, then radiation shielding is improved, but the window operation is hindered
Solution Approach 1:
The roll screen mechanism is designed to be dynamic and adaptable, allowing it to be deployed or retracted based on operational needs. The screen can be positioned at different depths (behind glass when closed, in front when open) to accommodate window movement, maintaining both radiation shielding capability and window operability
Solution Approach 2:
The sunshade function is moved from a fixed planar position to a three-dimensional space around the window. By positioning the screen at different depths relative to the window glass depending on window position, the system resolves the conflict between radiation blocking and window operation through spatial arrangement
3Ease of operation
If the winding member is positioned behind the front window glass, then window operation is smooth, but solar radiation shielding is reduced
Solution Approach 1:
The position of the winding member is made dynamic rather than fixed. It automatically changes position based on window state: behind the glass when closed for smooth operation, and in front of the glass when open for effective radiation shielding. This dynamic repositioning resolves the contradiction between operational smoothness and shielding effectiveness
Data Source
AI summary
A cab capable of shielding solar radiation comprises a pair of front pillars and a pair of vertical beams; a front window glass member mounted movably along guide rails formed along the front pillars and the vertical beams, between a closing position for closing a front window formed between the front pillars and an opening position for opening the front window accommodated between the vertical beams; a roll screen and a winding member, wherein the winding member is disposed behind the inner surface of the front window glass member positioned at the closing position and in front of the front end of the front window glass member positioned at the opening position and on the outer side of the pair of guide rails; and a holding means attached to the front pillars and configured to releasably hold the leading end of the screen.