Scraper Chain Conveyor Form-Fit Lock Design
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Solution Overview
Problem
Scraper chain conveyor connections, particularly vertical threaded connections, are unreliable due to thrust forces and uneven terrain, leading to loosening issues, and existing thread-less connections have not established themselves in underground mining.
Innovation Solution
The use of form-fit locks with curved or inclined positive lock surfaces on the upper and lower scraper elements, which engage to provide a reliable connection reinforced by operational forces, eliminating the need for additional fastening means and incorporating a bolt for additional security during return travel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a vertical threaded connection is used to connect upper and lower scraper elements, then the connection can be assembled, but the connection is unreliable and prone to loosening due to thrust forces and uneven terrain
Solution Approach 1:
The connection system is divided into two functional parts: form-fit locks for transport direction stability and a bolt for return travel security. This segmentation allows each component to address specific force directions independently, resolving the reliability issue while maintaining assembly simplicity.
Solution Approach 2:
The positive lock surfaces are curved or inclined rather than flat, allowing them to engage in a way that converts thrust forces into reinforcing lock fit. The curved geometry enables the surfaces to press against each other under load, automatically strengthening the connection in the transport direction.
2Reliability
If additional fastening means are added to secure the threaded connection, then connection reliability improves, but device complexity and manufacturing cost increase
Solution Approach 1:
The form-fit locks with curved surfaces are designed to self-reinforce under operational thrust forces. The geometry of the locking surfaces automatically increases the lock fit when subjected to transport forces, eliminating the need for additional complex fastening mechanisms while maintaining high reliability.
Solution Approach 2:
The invention extracts and eliminates unnecessary fastening components from the connection system. By using form-fit locks that self-reinforce under load, the design removes the need for multiple bolts, nuts, and locking mechanisms that would otherwise be required to secure a threaded connection, thereby reducing complexity while maintaining reliability.
3Stability of the object's composition
If a form-fit locking cog with slit engagement is used to stabilize the vertical threaded connection, then guided vertical movement is allowed, but sliding movement is prevented and additional fastening means cannot be eliminated
Solution Approach 1:
Instead of using a cog-and-slit mechanism that prevents sliding, the invention inverts the approach by using curved positive lock surfaces that allow and even encourage sliding movement through form-fit engagement. The curved surfaces guide movement while the form-fit nature prevents separation, eliminating the need for additional fastening means.
Data Source
AI summary
A scraper for use on a scraper chain conveyor, the scraper having an upper element and a lower element. A chain bed for receiving at least one horizontal chain link and at least one vertical chain link is formed in both upper and lower elements. The upper element and lower element are connected together by means of form-fit surfaces provided on the upper element and the lower element, such that these form-fit surfaces engage with each other when the two elements are assembled for operation to form a form-fit lock. A chain link presses from behind against the lower element or the upper element of the scraper in the direction of transport and this force reinforces the form-fit lock between the two elements.