| 摘要 |
<p>1,167,523. Compression moulding. BRITISH IRON & STEEL RESEARCH ASSOCIATION. 26 Oct., 1967 [26 Oct., 1966], No. 47989/66. Heading B5A. [Also in Divisions B8 and G1] A powder, e.g. of iron ore, is analysed by forming a pellet of the powder in a die at a first position of the die, moving the die to a second position where the pellet is analysed and disposing of the pellet as the die is returned to its first position. The analyser frame 40 carries on a spigot 41 a rotatable turret 42. The turret carries three die-rings 67 which are equi-spaced about the axis of the turret and in the first position of the turret are below corresponding sample feed devices 50. The tube 55 is lowered by hydraulic pressure applied at 58 into contact with the die-ring 67 and a measured quantity of sample from a sample meter (see Division B8) passes down the tubes 59 and 55 to the die-ring 67. A pressure-plate 68 is moved hydraulically to engage the die-ring 67 and the piston 66 is moved hydraulically upwards to compact the sample into a pellet. The turret then indexes round to a position where the pellet is underneath an X-ray fluorescence analyser 71 which is then lowered into contact with the pellet. The analyser comprises a radio-active source of primary X-rays and a gas-filled counter tube connected to a pulse light analyser. The three X-ray analysers may test for iron, calcium and silicon in sinter mix. The silicon analyser is flushed with hydrogen or helium to minimize absorption of fluorescent radiation. After analysis the turret returns to its first position, and during this movement the piston 66 moves upward to push the pellet clear of the die-ring 67 whence it is removed by a scraper blade mounted between the first and second turret positions and returned to the sinter feed conveyer or otherwise disposed of. The electrical and hydraulic control circuit of the machine are described. Calibration.-The analysers may be calibrated periodically or at will by rotating the counter tube 80 step-by-step by means of an electric motor 83 so that the analyser "analyses" in turn three known samples 85, 86, 87 to provide three fixed points on the analyser calibration curve. Reference has been directed by the Comptroller to Specification 1,106,074.</p> |
