The Impact of Passive Displacement Fixed Jaw Design on Liner Wear in Single Toggle Jaw Crushers

Single toggle jaw crushers are widely used in mining and aggregate industries, but they suffer from significant liner wear, leading to increased maintenance costs and downtime. This research investigates the impact of a novel single toggle jaw crusher design with a passive displacement fixed jaw on liner wear. The investigation was done by carrying out a comparative analysis between the conventional jaw crusher design and the new jaw crusher design. During the evaluation of the conventional and new crusher designs, the liners were initially weighed with an electronic scale of 20 g sensitivity, and the readings were recorded. The jaw liners were then assembled to the crusher jaws before starting the crusher. Measured rock samples were then loaded intermittently into the crushing chamber to be crushed. The jaw liners were dismantled from the crusher and weighed, after crushing 470.50 kg of rock sample. The wear of the jaw liners was computed by subtracting their final weights from their initial weights. A total of 1411.5 kg of rocks were crushed with each crusher design configuration. After testing the crusher for both the conventional and the new designs, the results show that the overall wear amount experienced by the conventional jaw crusher liners was 87.88 % more than that of the new crusher design. This revealed that the introduction of a passive movable fixed jaw helped in reducing the relative sliding between the jaw liners and the crushed material, hence the reduction in jaw liner wear.