| 摘要 |
1456351 Centrifugal casting PONT-A-MOUSSON SA 26 March 1975 [1 April 1974] 12551/75 Heading B3F In a casting machine for centrifugally casting iron pipes, in which the mould is cooled by water from primary cooling tubes parallel to the length of the mould, local overheating of the mould which may cause inhomogenous structures is overcome by additional secondary water spraying. A centrifugal casting machine comprising a carriage A movable on runway C has a mould 2 rotatable by rollers 7 driven by motor 8. Three fixed water spraying tubes 10, two above the axis X-X of the mould 2 and one below, are disposed longitudinally in casing 1 near the outer surface of the mould 2. The tubes 10 are supplied with water through pipes 11, 13 through T-pipe 31 connected to mains water 32. A longitudinal guide bar 14 which may have a square section, rotatable in bearings 15 is located in the lower part of casing 1, and may be maintained in different angular positions by a pin 16 and hole 19 arrangement. Slidably mounted on bar 14 are two slides 20, carrying rigid pipes 21, the upper ends of which being secondary water sprays 22 parallel to and slightly above axis X-X of mould 2 when operative. Water is supplied to sprays 22 via rigid pipes 24 connected to flexible hoses 25 through connectors 28. Hoses 25 pass through the upper wall of casing 1 and are connected to mains water 32 by means of valves 30, which may be manually or electrically operated. Drainage pipes 33 permit the cooling water to be removed from the assembly. Sprays 22 and their associated pipes 24 may be released from connectors 28 and rotated out of position, Fig. 3 (not shown), and the location of slide 20 on bar 14 may be adjusted to accommodate varying sizes of moulds 2. In operation, when excessively hot portions are noted on cast pipes, slides 20 are moved along bar 14 to the required location, and the pipe moulds are further cooled by the secondary sprays 22. In a modification a photoelectric cell 34, mounted on the pouring channel B detects the abnormally hot zones and signals valve 30 to supply water to the secondary sprays 22. In a further modification, two guide bars 14 may be provided on opposite sides of the mould 2, each with two secondary spray assemblies. |
