Switchbox Cam Transmission Assembly for Compact Multi-Switch Actuation
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Solution Overview
Problem
Conventional switchbox designs face challenges in securely activating multiple switches within hazardous environments, particularly under high temperatures, pressures, and seismic loads, where the existing configurations may lead to unintended displacement and damage.
Innovation Solution
A compact transmission assembly for a switchbox or valve controller that includes a cam sub-assembly with a shaft and locking member, allowing for adjustable angular placement of cams to trigger multiple switches simultaneously, ensuring secure activation and reduced space occupancy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional switchbox designs are used with multiple cams and switches disposed within an enclosure, then the switches are protected from damage in hazardous environments, but the components may experience unintended displacement under seismic loads and high temperatures
Solution Approach 1:
The cam assembly is segmented into multiple independent cams (first cam, second cam) that can be independently positioned and adjusted along the shaft. Each cam can be set to activate its corresponding switch at different angular positions, allowing for flexible configuration while maintaining stable operation under seismic and thermal conditions.
Solution Approach 2:
The system allows for preliminary adjustment of cam positions before deployment. The cams can be pre-positioned and secured on the shaft at specific angular locations to ensure they activate the appropriate switches at the desired points during operation, even under extreme environmental conditions.
2Adaptability or versatility
If multiple cams are stacked on top of each other to trigger multiple switches at different rotation points, then the switchbox can detect multiple valve positions, but the overall height and space occupancy of the assembly increases
Solution Approach 1:
Instead of stacking cams vertically along the height of the enclosure, the invention positions multiple cams radially around the shaft at different angular positions. This transforms the problem from a vertical stacking arrangement to a radial distribution arrangement, allowing multiple switches to be triggered at different rotation points while maintaining a compact vertical profile.
3Measurement precision
If the shaft is rotated to set the switchbox assembly to trigger at a certain point of rotation, then the desired activation point can be achieved, but the adjustment process becomes complex and time-consuming
Solution Approach 1:
The cams are designed to be independently adjustable along the shaft to pre-set specific angular positions. This preliminary positioning capability allows the system to be configured for precise activation points without requiring complex rotation and trial-and-error adjustment during installation or maintenance.
Solution Approach 2:
The cam assembly incorporates dynamic adjustment mechanisms that allow for easy repositioning of cams along the shaft. This dynamic configurability enables quick adjustment of activation points by simply moving cams to different positions, rather than requiring precise rotation of the entire shaft assembly.
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
The solution enables secure and efficient activation of multiple switches within a compact design, enhancing reliability and reducing manufacturing costs by allowing for single-hand adjustment and flexible angular placement, thus addressing the challenges of hazardous environments and space constraints.
Implementation Method 1
The switching circuit may include an element, such as a lever, that is biased in a first position by a permanent magnet contained in the housing of the proximity switch
Implementation Method 2
When the target passes within a predetermined range of the proximity switch, the magnetic flux generated by the target magnet causes the lever of the switching circuit to change bias from the first state to a second state
Data Source
AI summary
A valve controller includes a housing defining an interior volume, and a transmission assembly at least partially disposed in the interior volume of the housing. The transmission assembly includes a shaft coupled to a cam sub-assembly, which includes a first side and a second side opposite the first side, a first cam, and a second cam coupled to the first cam. Each of the first and second cams includes a bore arranged to receive the shaft and a lobe. The lobe of the first cam and the lobe of the second cam being at least partially coplanar. A first switch and a second switch are disposed in the interior volume of the housing and adjacent to the transmission assembly. The lobe of the first cam is arranged to activate the first switch and the lobe of the second cam is arranged to activate the second switch.