Impact Bar With Asymmetric Sides And Detachable Holding Area
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Solution Overview
Problem
Impact strips in impact crushers experience high wear and are difficult to replace, leading to increased production downtime and reduced comminution efficiency due to jamming and uneven wear patterns.
Innovation Solution
The impact bar design features intersecting longitudinal sides and a detachable holding area with undercuts and screw connections, allowing for easy assembly and disassembly, reducing wear and improving material utilization and comminution efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If impact strips are installed with parallel longitudinal sides to enable easy assembly, then assembly simplicity is improved, but V-shaped gaps form between adjacent strips causing material jamming and reduced productivity
Solution Approach 1:
The impact strip employs asymmetric longitudinal sides where one side is inclined at an angle α (5°-15°) relative to the longitudinal axis while the other side remains parallel to the axis. This asymmetric configuration eliminates V-shaped gaps between adjacent strips, preventing material jamming and improving productivity while maintaining ease of assembly through the parallel side
2Strength
If impact strips are made with heavy mass to withstand high impact forces, then strength and durability are improved, but replacement time increases and productivity decreases
Solution Approach 1:
The impact strip is segmented into a wear section with square cross-section and a holding area with reduced cross-section. The holding area includes detachable connections (undercuts and screw holes) that enable rapid replacement. This segmentation allows the strip to maintain high strength in the wear section while enabling quick changeout through the simplified holding area, reducing replacement downtime
3Ease of manufacture
If impact strips are designed with uniform cross-section to simplify manufacturing, then manufacturing complexity is reduced, but material utilization decreases due to unnecessary material in non-wear areas
Solution Approach 1:
The impact strip features varying cross-sectional dimensions along its length: the wear section has a larger square cross-section (side length c) to withstand impact and provide wear resistance, while the holding area has a reduced cross-section (side length b < c). This local quality variation optimizes material usage by providing sufficient material only where needed for wear resistance, reducing unnecessary material in non-wear areas
4Ease of operation
If convex arrangement of impact strips is used to simplify installation, then installation ease is improved, but the number of fracture zones decreases and comminution efficiency is reduced
Solution Approach 1:
The impact strip employs a dynamic configuration where the longitudinal sides transition from parallel (providing simple installation) to inclined (creating fracture zones). The inclined side at angle α creates varying gaps between adjacent strips that generate fracture zones for effective comminution, while the parallel side maintains installation ease. This dynamic geometric variation resolves the contradiction between installation simplicity and comminution efficiency
Data Source
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AI summary
The invention relates to an impact strip for lining an impact chamber of an impact crusher, comprising the following features: a) The impact strip 1 has a front surface 2, a rear surface 3 at a distance from the front surface 2, and two longitudinal sides 4, 5 extending from the front surface 2 to the rear surface 3; b) The front surface 2 is not parallel to the rear surface 3 and forms an angle W3 with the rear surface 3 that is less than 90° and greater than 0°; c) The two longitudinal sides 4, 5 extend in longitudinal planes E1, E2, which intersect; d) An outer retaining area 6, projecting from the rear surface 3 and featuring undercuts 7, 8, is arranged on the rear surface 3 for the releasable, positive-locking attachment of the impact strip 1;e) The holding area 6 has a widened foot 10 and a shaft 9 that is narrower than the foot 10, the foot 10 being connected to the rear 3 via the shaft 9, the undercuts 7, 8 being located laterally on the shaft 9 and bounded by the foot 10 and the rear 3, the undercuts 7, 8 each having rounded areas 11, 12 in cross-section, which extend from the rear 3 to the upper flanks 13, 14 of the foot 10.