气动式龙眼去核装置的设计与试验

采用机电气一体化技术，先破口再去核的原理，研制了一种新型简单的气动式龙眼去核装置。该装置采用三角刀片使龙眼破口张开果壳和果肉后，利用压缩空气驱动气缸带动顶杆快速顶出龙眼核，降低了龙眼去核损失率。龙眼去核损失率与刀片厚度、顶杆直径、气压和气体流量等因素有关。试验结果表明，刀片厚度、顶杆直径、气体流量和气压对龙眼去核损失率的影响程度依次增大，在刀片厚度为2.5 mm，顶杆直径为7.0 mm，气压为0.55 MPa，气体流量为6.0 m³/h时，龙眼去核的损失率最低可达5.14%。

Design and experiment of a longan core-removing mechanism

This paper introduces the pneumatic longan core-removing mechanism, based on the process of longan-core removing before the hull is separated from the flesh fruits, which aims at reducing the longan-core removing loss rate. The mechanism adopts air compressor as power to feed fruits and to drive handspike to remove the longan core while the triangular blade cuts and opens longan during feeding. Also the mechanism can be suitable for the longan of different sizes. The correlative factors that influence the loss rate were considered as blade thickness, pneumatic pressure and flowrate. The result of the experiment shows that the triangular blade thickness mandril diameter, pneumatic flowrate and pressure have a crescent influence on longan core-removing loss rate. When triangular blade thickness is fixed at 2.0 mm, mandril diameter at 7.0 mm, pneumatic pressure at 0.55 MPa and flowrate at 6.0 m³/h in the designed prototype, the longan core-removing loss rate achieves the lowest value.