Asymmetric Pre-Cutter Wings for Heavy Chip Suction
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Solution Overview
Problem
Existing pumps used in machine tools for circulating lubricating coolant emulsions contaminated with metal chippings are inefficient in suction and conveying heavy chippings from the bottom of a collecting vessel.
Innovation Solution
The pump features two pre-cutter wings with different axial arrangements and angles relative to the shaft axis, where one wing forms an obtuse angle pointing downwards and the other an acute angle pointing upwards, ensuring efficient lifting and conveying of chippings from the bottom of the vessel to the suction opening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the pre-cutter has wings with the same axial arrangement, then the structure is simple, but the suction capability for heavy chippings from the bottom of the vessel is insufficient
Solution Approach 1:
The patent applies asymmetry by configuring the two wings with different axial arrangements on the shaft portion. One wing has its base portion at a first axial position while the other wing has its base portion at a second axial position, creating an asymmetric structure that enables differentiated functions: one wing effectively reaches the bottom of the vessel to suction heavy chippings, while the other wing conveys the chippings toward the suction opening.
2Productivity
If the wings are arranged to reach the bottom of the vessel, then heavy chippings can be suctioned, but the chippings may be flung away radially instead of entering the suction opening
Solution Approach 1:
The patent uses asymmetry in wing configuration where one wing is positioned to reach the bottom for suction while the other wing is positioned higher to guide the flow. This asymmetric arrangement ensures that chippings are not merely suctioned but are also properly directed toward the suction opening, preventing radial dispersal and improving entry reliability.
3Ease of operation
If both wings form the same angle with the shaft axis, then the manufacturing is simple, but the flow direction control for chippings is insufficient
Solution Approach 1:
The patent applies local quality by giving each wing a different angle relative to the shaft axis. The first wing forms a first angle with the shaft axis optimized for reaching the bottom and suctioning chippings, while the second wing forms a second angle optimized for conveying the chippings toward the suction opening. This localized differentiation in wing angles enables precise flow direction control at different stages of the suction process.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration allows for effective suction and conveying of heavier chippings from the bottom of the vessel, preventing radial dispersal and ensuring efficient entry into the pump's suction opening, thereby reducing clogging risks and improving overall coolant circulation.
Implementation Method 1
one of the wings has a portion or an end that is closer to the bottom of the vessel than any part of each of the other wings. Consequently, since this wing comes very close to the bottom of the vessel, it is capable of producing a suction that is capable of lifting and sucking-in also more heavier chippings
Implementation Method 2
a cutting wheel 20 mounted on the shaft 12 above the cutting plate 16, and blades of this cutting wheel are formed at their lower end with cutting edges 22 which, when the cutting wheel 20 rotates, move closely above and across the top ends of the passages 18
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A pump having a cutting wheel (20) and a pre-cutter (26) driven by a shaft portion (24) that projects axially from the cutting wheel (20) and has a plurality of wings (28) that extend radially from the shaft portion (24), wherein the wings (28) differ in their axial 5 arrangement on the shaft portion (24).