Tappet Head Fluid Delivery Device for Ground Milling Machines
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Solution Overview
Problem
Existing fluid delivery devices for ground milling machines have limitations in varying the injection pattern, are prone to clogging, and require significant installation space due to the need for a long stroke of the tappet, leading to non-uniform fluid distribution and potential uncontrolled fluid discharge.
Innovation Solution
A fluid delivery device with a tappet head that closes the outlet opening from the outside, featuring a tappet shaft with a narrower opening region and a wider tappet head, allowing for controlled fluid flow without complete withdrawal of the tappet from the outlet opening, reducing installation space and preventing clogging by acting as a lid or pushing away debris.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the tappet is completely withdrawn from the outlet opening to enable fluid flow, then fluid delivery is achieved, but the device requires significant installation space due to the long stroke needed
Solution Approach 1:
The tappet is segmented into two distinct functional regions: a tappet head for closing the outlet opening and a tappet shaft with an opening region for fluid flow control. This segmentation allows the tappet to perform multiple functions within a shorter stroke distance, reducing the overall space required for the displacement mechanism.
Solution Approach 2:
The tappet head is designed with a cross-sectional area that is at least partially greater than the outlet opening cross-section, allowing it to close the opening effectively. The tappet shaft has a narrower opening region that allows fluid to flow alongside it. This dimensional differentiation enables the tappet to control fluid flow without requiring complete withdrawal from the outlet opening, thereby reducing the displacement stroke and installation space.
2Quantity of substance
If the tappet is completely withdrawn from the outlet opening to enable fluid flow, then fluid delivery is achieved, but the injection pattern cannot be varied and fluid distribution becomes non-uniform
Solution Approach 1:
The tappet is designed to be displaceable between a closed position (where the tappet head closes the outlet opening) and an open position (where the opening region allows fluid flow). This dynamic positioning capability enables control over fluid delivery while maintaining the ability to vary injection patterns through different displacement positions.
Solution Approach 2:
The tappet shaft features a narrower opening region with a cross-sectional area smaller than the outlet opening, creating a specific flow geometry that allows fluid to pass alongside the tappet shaft. This local structural characteristic enables controlled fluid distribution and injection pattern variation without requiring complete tappet withdrawal.
3Quantity of substance
If the tappet is completely withdrawn from the outlet opening to enable fluid flow, then fluid delivery is achieved, but the outlet opening is prone to clogging by ground material
Solution Approach 1:
The tappet head is designed to close the outlet opening from the outside, creating a protective barrier that prevents ground material from entering and clogging the outlet opening. This preliminary protective action is maintained even when the tappet is in the open position for fluid delivery, as the tappet head remains positioned to shield the outlet.
Solution Approach 2:
The tappet shaft with its narrower opening region acts as an intermediary structure within the outlet opening. It allows fluid to flow alongside it while preventing ground material from blocking the outlet opening, thus mediating between the need for fluid delivery and the need to prevent clogging.
Data Source
AI summary
A fluid delivery device for an injection device for introducing a fluid into a work chamber of a ground milling machine, comprising a fluid supply chamber having at least one outlet opening, the outlet opening being closable by a linearly displaceable tappet. The tappet includes an opening region in which it has a smaller cross-sectional area than the minimum cross-sectional area of the outlet opening, and a tappet head for the closure of the outlet opening, the tappet head having a cross-sectional area that includes the cross-sectional area of the outlet opening. Further, the fluid delivery device comprises a displacement device for moving the tappet between a closed position, in which the outlet opening is closed by the tappet, and an open position, in which the outlet opening is open for delivering fluid outward out of the fluid supply chamber. The tappet is configured such that the tappet head closes the outlet opening from the outside in the closed position, and that the opening region is at least partially arranged in the outlet opening and the tappet head at least partially opens the outlet opening in the open position.