| 摘要 |
<p>1287347 Cleaning bar filters ALLIS-CHALMERS MFG CO 28 Aug 1970 [4 Sept 1969] 41524/70 Heading BID A rake assembly for removing debris from a bar filter screen 7, Fig. 4, located in a water stream comprises two members 13, 14, e.g. two ribbed plates as shown one being curved at its lower end or two sets of teeth and tines, which are relatively pivotable about hinge pin 22 by means of a double acting hydraulic cylinder 23, the whole being suspended from cable 28 for vertical reciprocation by means of an electric hoist 26. The hoist 26 and hydraulic fluid supply 31, Fig. 1, are horizontally movable upon an I-bar 24. The cylinder 23 is connected to the supply 31 via flexible hoses 37, 38 which are wound on spring biassed reels 34, 36, and which communicate with conduits 39 41 and a valve 42. In operation fluid is supplied via hose 38 to cause the cylinder 23 to open the rake whereupon the hoist 26 is actuated to lower the assembly. At the bottom of the screen valve 42 is moved so that fluid now flows via line 37 so causing closure of the rake. The assembly with entrapped debris is then raised clear of the water stream by the hoist 26.</p> |
