Full
Outline
Inclined shaft hoisting conveyances are characterized by heavy payloads and high operating speeds, which generate tremendous impact forces upon braking during a runaway event. However, existing runaway protection devices primarily rely on passive safety facilities within the shaft for interception. They are unable to adapt to the dynamic variations in impact energy, failing to achieve effective energy absorption. To address this issue, a design and optimization method for an adaptive multi-stage buffered inclined shaft hoisting conveyance was proposed, aiming to achieve mechanical braking and the staged absorption of impact energy following a runaway event. Based on this structure, a multi-body coupled impact dynamics model of the multi-stage buffered hoisting conveyance and the inclined track was established. The effect of multi-stage buffering on the braking impact force of the hoisting conveyance system was investigated, and the stiffness of the buffer springs was optimized based on the Sequential Quadratic Programming (SQP) algorithm. The results indicate that, compared with the unbuffered structure, the multi-stage buffered structure reduces the impact force by 24.5%, significantly decreasing the impact response, presenting smaller residual oscillations, and yielding a smoother curve. After the spring stiffness is optimized by the SQP algorithm, the impact force of the hoisting conveyance and inclined track system decreases by 35.5% and 14.7% respectively, compared to the unbuffered system and the pre-optimization multi-stage buffered system. This improves the absorption efficiency of impact energy, enhances the system's impact performance, and results in a more stable secondary impact force. The research findings provide a theoretical basis for the impact-resistant design and safe braking strategies of inclined shaft hoisting conveyances.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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