| 摘要 |
<p>A melter needle position control mechanism and motorized incremental drive for controlling the position of a needle relative to an orifice in a furnace. Conventional melter needle control mechanisms are cumbersome, inaccurate and do not facilitate servicing of the needle. The present mechanism has a support (36) for a fluid operated piston (49) which allows a boom or an 1-beam (76) to be rotatably mounted and to extend over the orifice (32) of a melter (10). A movable mount (144), providing a support for a needle (30), is vertically translatable by a vertical adjustment shaft (184) that is driven by a miter gear (156). The gear (156) is coupled to a rotatable command shaft (164) which is controllably rotated by a motorized incremental drive (26). A rotary actuator (58) rotates the I-beam (76) and the needle (30) to a retracted position after the I-beam (76) is sufficiently moved vertically whereby the needle (30) may be serviced. Radial, lateral and initial vertical adjustments are also possible with the present invention. </p> |
