Truck-Mounted Concrete Pump Pivot Leg Design
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Solution Overview
Problem
The existing truck-mounted concrete pumps face inefficiencies due to the staggered design of their pivoting legs, which compromises their ability to absorb loads effectively, leading to heavier and less economical components.
Innovation Solution
The pivoting legs are coupled to a common pivot axis via an upper and lower pivot bolt part, with a partial cylindrical contact surface that does not fully encompass the upper pivot pin part, allowing for more advantageous structural height and direct power flow from the placing boom to the support legs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the pivoting legs are designed with full ring-shaped contact surfaces encompassing the pivot pin parts, then the load-bearing capacity and stability are improved, but the component height and weight increase significantly
Solution Approach 1:
The contact surface is segmented into a partial cylindrical surface rather than a complete ring-shaped surface. The upper contact surface extends only over a portion of the pivot pin part's circumference, specifically in the region where compressive forces act, eliminating the need for full 360-degree contact surfaces and reducing component dimensions and weight.
Solution Approach 2:
The contact surface is localized to the specific region where compressive forces act during operation. The upper contact surface is provided only in the area subjected to compression, while the lower contact surface handles tensile forces, optimizing material usage and reducing overall component size and weight.
2Stability of the object's composition
If the pivoting legs are designed with full ring-shaped contact surfaces encompassing the pivot pin parts, then the stability and load distribution are improved, but the structural height increases
Solution Approach 1:
The contact surface is divided into upper and lower partial cylindrical surfaces that do not fully encircle the pivot pin parts. This segmentation allows the legs to be shorter in height while maintaining stability through strategically positioned contact areas that handle specific force directions.
Solution Approach 2:
The contact surfaces are arranged in different vertical positions rather than forming continuous rings. The upper contact surface is positioned higher than the lower contact surface, creating a staggered arrangement that provides stable load distribution without requiring increased overall leg height.
3Reliability
If the front pivoting leg is made telescopic to achieve required leg length, then the stand safety is improved, but the component complexity and weight increase
Solution Approach 1:
The telescopic front pivoting leg is divided into multiple telescopic sections that can extend and retract. This segmentation allows the leg to achieve the required extended length for stable machine stance while maintaining a compact retracted form, reducing the need for excessive overall leg dimensions and associated weight.
4Weight of stationary object
If the pivoting legs are designed with partial cylindrical contact surfaces, then the component weight and height are reduced, but the contact area with pivot pin parts is decreased
Solution Approach 1:
The contact surfaces are concentrated in the specific regions where forces are transmitted during operation. The upper partial cylindrical contact surface is positioned where compressive forces act, and the lower partial cylindrical contact surface is positioned where tensile forces act, ensuring adequate contact area exactly where needed rather than distributing contact area uniformly around the pivot pin.
Data Source
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AI summary
The invention relates to a truck-mounted concrete pump (1) with at least one front and at least one rear pivot leg (2, 3), wherein the pivot legs are coupled to a base (5) of the truck-mounted concrete pump via an upper and a lower pivot pin part (61, 62) with a common pivot axis. The invention further relates to a corresponding pivot leg for a truck-mounted concrete pump.