| 摘要 |
1,216,069. Endless conveyer belts. CLOUTH GUMMIWERKE A.G. 1 Dec., 1969 [11 Dec., 1968], No. 58582/69. Heading B8A. A supervision apparatus for conveyer belts of rubber or similar material comprises electrically conductive inserts embeddedin the belt, each including two conductors 4, 5 lying closely side-by-side, or coaxially, and extending over approximately the whole width of the belt, and forming part of an open current circuit or an open inductive loop, at least one electric impulse transmitter 2, and at least one signal receiver 6 connected to a switch device 8 for actuating signalling and/or conveyer belt control means, the arrangement being such that signals are transmitted from a transmitter to a receiver if contact is established between the two conductors of an insert due to damage to the belt. The conductors 4, 5 may consist of cables sheathed with steel wire or of steel or copper braids. At least one of the conductors may be made tubular with the two conductors arranged coaxially. The system may be tested by bridging the conductors 4, 5, where they meet the edge of the belt (lower edge, Fig. 1). As shown, a current source 3 is in the form of a small battery 3. The signal is picked up by an aerial 7 in the form of an induction loop. The latter may be replaced by a series of aerials (7.1; 7.2; 7.3 . . . &c., Fig. 2, not shown). The battery 3 may be disposed outside the belt and is connected by contact rollers (14), (15), (Fig. 3, not shown) engaging conductors (12), (13), each connected to an end of respective conductors 4, 5. The conductors (12), (13) may be so arranged (e.g. at 16, Fig. 4, not shown) as to pick up signals from a transmitter 2 disposed adjacent the belt. Two sets of conductors (12), (13) may be disposed (as at 16, 16, Fig. 5, not shown) at respective sides of the belt and are connected to alternative sets of the conductors 4, 5. Alternatively, one of the conductors 16 may be connected to all the conductors 4 (e.g. 17, Fig. 6, not shown) and the other may be connected to all the conductors 5. The conductor 4 of one pair 4, 5, may be connected at each end to corresponding ends of the conductor 5 of the next pair and so on (Fig. 8, not shown). Each group thus formed constitutes a series of transmitters 2 and receivers 6 disposed alongside, but spaced from, the belt, the pitch of the transmitters and of the receivers being equal to the length of each group arrangement of conductors. |
