| 摘要 |
1330895 Spraying fusible materials GLAVERBEL 26 Oct 1970 [4 Oct 1969] 49996/72 Divided out of 1330894 Heading B2F Apparatus for discharging a mixture of solid combustible and other particles, particularly for forming a refracting mass, comprises a discharge tube 8 to which the particles and an oxidising gas are delivered and means at least indirectly responsive to dangerous operative conditions to automatically establish safe conditions. The discharge tube 8 is connected by a flexible hose 16 and rigid piping 18, 19 to a distributor 7 comprising a casing 26 enclosing a hopper 31 and supplied with oxygen at 22. A shaft 34 drives a stirrer 40 in the hopper and a disc 38 receiving material from the hopper. A scraper 44 pushes material from the disc 38 into a funnel 46 leading to conduit 19 at a constant rate, to be entrained by the oxygen supplied to the casing. A pressure relief disc 56 is mounted on the casing cover, and a low temperature fuse 60 in the conduit 18 cuts off the power in the event of a flash back. A temperature sensor 62 in the cooling jacket of the tube 8, a pressure sensor 82 monitoring the gas in the tube and oxygen valve 68 are connected through a control box 50 with a purging nitrogen supply valve 70, a nitrogen pressure sensor 64 and a vent relief valve 74. Melting of the fuse 60, overheating of the lance, or a deviation from the set value of the pressure of the lance closes the oxygen valve 68, opens the nitrogen valve 70 and stops the drive of shaft 34. The valve 74 opens to allow the supply piping to be flushed, and if the pipe 16 is blocked beyond the vent 74 the nitrogen escapes from fusible disc 78 adjacent the fuse 60. The oxygen supply is shut off if the available nitrogen pressures falls. A failure of the control voltage cuts off the oxygen supply, and any of these conditions operates a warning signal. |
