Toggle Link Asymmetry Reduces Pin Bending Moments
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Solution Overview
Problem
Existing toggle type mold clamping devices experience bending of link pins during mold closing and clamping, leading to wear and reduced strength due to applied bending moments and restricted movable ranges.
Innovation Solution
The design includes a first link with a central portion and two side links, where the toggle driving link is coupled on the outer side of the first link's center line, allowing the toggle driving link to extend without displacing the link unit outward, and the first link is formed integrally to prevent deformation, with bifurcated pivot portions to enhance rigidity and movable range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the toggle driving link is coupled at the center of the first link, then the structure is simple, but the link pins experience bending moments causing wear and reduced strength
Solution Approach 1:
The toggle driving link is coupled to the first link at an asymmetric position offset from the center line toward the rear platen side. This asymmetric coupling position changes the force transmission path, allowing the toggle driving link to extend without displacing the link unit outward while reducing bending moments on the link pins, thereby maintaining link pin strength without increasing device complexity
2Length of moving object
If the link unit is displaced outward to extend the toggle driving link, then the toggle driving link can extend, but the vertical width of the mold clamping device increases
Solution Approach 1:
Instead of extending the toggle driving link by displacing the link unit outward in the vertical direction, the invention offsets the coupling position along the center line toward the rear platen side (horizontal dimension). This dimensional change allows the toggle driving link to extend while maintaining the same vertical width of the mold clamping device
3Adaptability or versatility
If the first link is made flexible to allow movement, then the movable range increases, but the link pin experiences bending and deformation
Solution Approach 1:
The asymmetric coupling position of the toggle driving link on the first link creates an optimized force transmission path that reduces bending moments on the link pins. This allows the first link to move and rotate within its movable range while the link pins experience reduced bending, preventing deformation and maintaining structural stability
Data Source
AI summary
In a toggle type mold clamping device including a plurality of link units, a coupling portion of a first link coupled with a toggle driving link is provided on an outer side of an area between a coupling portion of the toggle driving link coupled with a crosshead and a center line of the first link. Furthermore, the first link has a structure in which two members arranged in parallel are coupled and integrated with each other and a space through which the toggle driving link passes is formed between the two coupled members.