| 摘要 |
A screw conveyor 10 comprises a body 12, a shaft 14 mounted within the body 12, a helical screw 16 disposed around the shaft, the shaft 14 having first and second ends, the first end having a projection 44 with a polygonal cross-section extending coaxially from the shaft 14 and the second end having a corresponding cooperative polygonal socket 14a within which a relief groove 400 is provided for receiving debris. Debris can collect in relief groove 400 instead of fouling the space between mating surfaces of the projection 44 and socket 14a. The projection 44 and socket 14a may be of hexagonal cross section and chamfered or bevelled fillets 44a may be provided between adjacent edges of the shaft 44. The projection 44 may be provided on an intermediate section 41 having two polygonal projections 44 joined coaxially and separated by a central section (42 fig. 3) of circular cross-section. The socket 14a may include a removable cover 14d. The projection 44 and socket 14a may provide couplings between abutting shafts 14. The screw conveyor 10 may be used for handling oilfield drilling cuttings. |
