Multi-optical axis sensor twist suppression sealing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional multi-optical axis photoelectric sensors face difficulties in closely fixing the light transmitting plate to the frame body due to the elastic member being sandwiched and held in a twisted state between the light transmitting plate and the frame body, which complicates the sealing process and affects the sealing quality.
Innovation Solution
The multi-optical axis photoelectric sensor incorporates a design where the elastic member has a sealing part and a twist suppression part integrally formed, with the sealing part pressed to the bottom surface of the storage groove and the twist suppression part stored in a concave part, preventing rotation and twisting, thus ensuring proper sealing without the elastic member being sandwiched in a twisted state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a string-shaped elastic member is used to closely fix the light transmitting plate to the frame body, then the light transmitting plate can be securely sealed, but the elastic member may be sandwiched and held in a twisted state between the light transmitting plate and the frame body, making it difficult to achieve proper sealing
Solution Approach 1:
The elastic member is divided into two functional segments: a sealing part that contacts the light transmitting plate to prevent light leakage, and a twist suppression part with a specific cross-sectional shape that prevents rotational twisting. This segmentation allows each part to perform its specific function independently, resolving the contradiction between sealing quality and assembly ease.
Solution Approach 2:
Different parts of the elastic member are given different local properties: the sealing part has a circular cross-section optimized for sealing, while the twist suppression part has a non-circular cross-section (such as D-shaped or rectangular) that prevents rotation. This local differentiation enables the elastic member to simultaneously achieve both secure sealing and resistance to twisting during assembly.
2Ease of manufacture
If the elastic member is allowed to rotate freely in the storage groove, then the assembly process is simpler, but the elastic member twists in a direction perpendicular to the peripheral direction of the storage groove, preventing close fixation of the light transmitting plate
Solution Approach 1:
The twist suppression part of the elastic member is designed with an asymmetric cross-sectional shape that does not match the circular storage groove. This asymmetry creates geometric interference that prevents the elastic member from rotating perpendicular to the storage groove's peripheral direction, ensuring precise fixation without complicating the assembly process.
Solution Approach 2:
The twist suppression part is designed in advance to counteract the potential twisting motion before it occurs during assembly. By incorporating this preventive geometric constraint into the elastic member's structure, the design proactively prevents the twisting problem rather than attempting to correct it after assembly begins.
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 configuration effectively prevents the elastic member from twisting in the storage groove, ensuring a stable and secure sealing of the gap between the outer case and the light transmitting plate, enhancing the sealing quality and ease of assembly.
Implementation Method 1
a string-shaped elastic member 4 which seals the gap between the outer case 2 and the light transmitting plate 3
Implementation Method 2
by an interference of an inner wall of the concave part provided on the outer side wall of the storage groove and the part of the elastic member arranged in the concave part, the elastic member is prevented from rotating in the storage groove in a direction perpendicular to a peripheral direction of the storage groove
Data Source
Figure 1(A)~1(B)
Figure 2
Figure 3
AI summary
The disclosure prevents a string-shaped elastic member from being sandwiched and held between a light transmitting plate and a frame body or the like in a twisted state. At least a part of a side wall on an outer side of a storage groove (21) is provided with a projection part (22) preventing an elastic member (4) from being twisted.