| 摘要 |
783,990. Lapping. CRANE PACKING CO. March 21, 1955 [March 29, 1954], No. 8202/55. Class 60. A machine for lapping flat work such as the running faces of rotary mechanical seal elements comprises an annular lap plate 48, e.g., of cast iron secured to a hub 46 keyed to a hollow shaft 38. The hollow shaft 38 is journalled within a sleeve 30 supported by beams 24, 26, 28 and an elliptical partition 32, from the cylindrical casing 14 of the machine. A shaft 70 rotatably mounted within the hollow shaft 38 carries at its upper end a drive member 72 having a frusto-conical portion and a cylindrical portion, the latter carrying a band of rubber or other friction material. Four wear rings 74 preferably formed of the same material as the lap rest on the annular surface of the lap and overhang slightly both the inner and outer peripheries. The knurled periphery of each wear ring engages the friction band on the drive member 72 and also a rubber or other resilient friction band on a freely rotatable roller 76 carried by a bracket 78 secured to the upper rim of the casing 14, there being one such roller for each wear ring. The wear rings are thus restrained from being carried around the axis of the lap due to the rotation of the lap, while their rotation about their own axes is controlled by the drive member 72. A motor M1 on the machine base, drives, through reduction gear 102, a shaft 104 which drives, through a pair of belts 120, the hollow shaft 38 carrying the lap. The shaft 104 also drives, through gears 122, 124, 126, 128 contained in a gear box 108, a shaft 130 which drives, through belt 140 and expandable pulley 136, the shaft 70 carrying the drive member 72. The gear box 108 is pivoted about the shaft 104 by a turnbuckle 114 interposed between an ear 110 on the gear box and the casing 14, adjustment of the turnbuckle thus altering the speed at which the shaft 70 is driven. A lapping compound container 150 is mounted on the inside of an access door 20. A submerged impeller 204, driven by a motor M2, forces lapping compound up a pipe 160 to a fitting 164 having a drip opening 166 controlled by an adjustable valve 194; excess compound returns through an inner pipe 174 and enters the container through a nozzle 178 so as to agitate the contents of the container. When the door 20 is closed the opening 166 is situated above the drive member 72 so that compound drips on to the frusto-conical portion thereof, and then is transferred to the sides of the wear rings and so on to the lap plate at widely distributed points. The work is placed within the wear rings, and the desired shape of lap is maintained by adjusting the rate of rotation of the rings.
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