Overmolded Pivot Rod for Heavy-Duty Plastic Conveyor Belts
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Solution Overview
Problem
High-strength pivot rods are needed for heavy-duty plastic conveyor belts to handle high loads, but existing solutions, such as using steel rods, are expensive and inefficient due to the weak shear strength of plastic pivot rods.
Innovation Solution
A pivot rod formed by overmolding a grooved rod with a plastic head, using shear-resistant materials like steel or reinforced plastic, with features like reduced diameters and grooves for enhanced retention and ease of assembly/disassembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If steel rods are used to join heavy duty plastic modules, then the shear strength and load-bearing capacity are improved, but the manufacturing cost and process complexity increase
Solution Approach 1:
The pivot rod is constructed as a composite structure combining a steel core (for shear strength) with an overmolded plastic head (for retention and assembly). This composite approach achieves the necessary mechanical strength while maintaining ease of manufacture through integration of multiple materials with complementary properties.
Solution Approach 2:
The invention merges the steel rod body with the plastic head into a single integrated component through overmolding. The plastic head is directly formed over the steel rod end, combining the strength benefits of steel with the retention benefits of plastic in one unified part, eliminating the need for separate retaining rings or complex assembly steps.
2Ease of manufacture
If plastic pivot rods are used for joining belt modules, then the cost and ease of manufacture are improved, but the shear strength and load-bearing capacity deteriorate
Solution Approach 1:
The pivot rod uses a composite structure with a steel core providing shear strength and a plastic overmold providing retention characteristics. This allows the rod to achieve high strength performance while maintaining the ease of manufacture associated with plastic components, as the plastic head can be overmolded directly onto the steel rod in an integrated process.
Solution Approach 2:
The invention applies different material properties to different parts of the pivot rod: the steel core provides shear strength where needed (in the rod body), while the plastic head provides retention and ease of assembly (at the ends). This local differentiation of material properties optimizes both strength and manufacturability in their respective functional zones.
3Reliability
If retaining rings are formed on steel rods, then the retention capability is improved, but the manufacturing cost and process complexity increase
Solution Approach 1:
The retaining ring function is merged into the overmolded plastic head, which is formed directly over the steel rod end in a single integrated manufacturing process. This eliminates the need for separate retaining ring components and their associated assembly steps, improving both retention capability and manufacturing efficiency.
Solution Approach 2:
The plastic head overmolded on the steel rod serves as an integrated retention mechanism, combining the structural function of a retaining ring with the rod itself. This composite structure provides reliable retention while being manufactured as a single integrated component, reducing process complexity and cost.
Data Source
AI summary
A pivot rod that is formed by overmolding the end of a grooved rod with a plastic head. The pivot rod may be formed out of shear resistant materials such as steel or the like. Alternatively, a headed rod may be formed by overmolding a highly shear resistant, reinforced extruded plastic rod with a plastic ring or head of a moldable compound.