GB1002720A - Improvements in pneumatic systems for handling pulverulent material - Google Patents

Abstract

1,002,720. Pneumatic conveyers; unloading vehicles. BUTLER MANUFACTURING CO. May 21, 1964, No. 21080/64. Headings B8A and B8E. In a system for discharging pulverent material from a container 20, Fig. 1, by blowing air into the container at diffusers in multiple outlet hoppers H, H<SP>1</SP>, H<SP>11</SP>, air is supplied from blower 28, an air pressure regulator 70 by which a pressure differential between the container 20 and the discharge line 71 can be adjusted. Air is tapped off at branches 67, 68 before the regulator 70 for supply via manifolds 64, 60 to the diffuser elements 51, Fig. 5. Material is released in turn from the hopper sections by adjustable outlet valves 72. Hollow annular ribs 31, 34 of the container wall 20 provide conduits between the upper part of the container and a check valve 77 which is coupled at 76 into the air supply line 65 between the supply check valve 66 and the pressure regulator 70. In the event of breakdown of the blower 28, the air in the container flows via check valve 77 into the line 65 and discharge line 71. In the event of a blockage in the line 71, the discharge valves 72 are closed and full pressure is allowed to build up in the container, whereby a reserve supply of air is obtained to augment the blown supply on the line 65. Sloping partitions 45, 46 at the ends of the container 20 provide reserve air spaces which are connected to the upper regions of the material containing portions of the container through the hollow annular ribs 31-34, the walls being apertured as at 74 to permit air flow into the ribs. Air diffuser elements 51, Fig. 4, are described in which air flows through channels 60 welded to the hopper walls 38, and passed to the interior through hollow bolts 58 to plenum chambers 54 for diffusion into the material through perforated partitions 53 and woven fabric 55. In modifications, examples are described of similar diffuser units 101, Fig. 9, which are detachably mounted as by springs 110 to hooked brackets 107, 108 within the container so that they may be readily removed when the container is required for carrying liquids. Detachable, plates may also be provided on the partitions 45, 46 so that the full volume of the container may be used for carrying liquids.