GB657418A - Apparatus for automatically weighing and bagging material such as coal - Google Patents

Abstract

657,418. Filling-machines. NATIONAL COAL BOARD, GREEN, W. A., and HILTON, F. E. Feb. 9, 1948, No. 3667. [Class 94(i)] [Also in Groups I, XVIII and XXX] In a coal bagging plant, an automatic feed weigher, of the kind in which the bulk feed is made volumetrically'by a measuring box, located at the top end of a shoot the lower end of which carries means for holding the open mouth of a bag. Coal is fed down a shoot 24, Fig. 2, into a hopper 28 located above the automatic feed weigher 33, part of the supply of coal being diverted through a screen 25 into a shoot 26 which terminates in a vibrating shoot 35 forming the dribble feed. The main charge is measured in a box 29 having top and bottom gates which are operated by pneumatic cylinders 58 and 65 through a valve 97 which also controls a bag clamping mechanism and is operated by a fool pedal 86 and hand-lever 90 through a linkage 91, 92, 93, 94 95. This linkage also controls the weigh beam relieving mechanism 99. The top gates of the measuring box comprise a pain of reciprocable elements 43, Fig 4, the trunnions 55 of which are engaged by links 56 which are operatively connected to a pivoting link 57 connected to the piston rod 60 of the pneumatic cylinder 58. These gates have rigid fingers 52, and spring- loaded fingers 53 so arranged that a rigid finger in one gate is opposite a spring finger in the other thus ensuring that the gates are not held open by large lumps of coal. The lower gates which are of the normal hinged type and are operated by the pneumatic cylinder 65, have the curved cutoff plates arranged eccentrically with the pivotal axis of the gates so that coal held above the gates tends to force them apart. After fitting a bag to spout 37 pedal 86 is depressed and, sequentially, the weigher is unlocked, the vibrator on shoot 35 is energized, the bag clamps are closed, gates 32 are closed, gates 43 are opened and the box fills. On attainment of the predetermined weight of material in the receptacle of weigher 33 the vibrator stops and the weigher discharges into the bag which is then transported on a conveyer 38 to a neck stitching machine (not shown), and thence by further conveyers to a loading station. Next the operator raises lever 90 so sequentially resetting pedal 86, locking the weigher, opening the bag clamps, closing the gates 43, opening the gates 32 and dumping the next bulk feed into the weigher ready for the next cycle of operations. Bag clamping means. - The bags are clamped on the bottom of the outlet spout 37, Fig. 12, by arms 68 which are pivoted at 67 and carry rollers 83 contacting cams 82 which move the arms from the position shown on the right of Fig. 12 to that shown on the left. The cams are reciproocated by a pneumatic cylinder 80, Fig. 11 (not shown). Guards (not shown) are provided to prevent injury to the operator.