GB192333A - Apparatus for the mechanical purification of water - Google Patents

Abstract

192,333. Geiger, E., and Buderus'sche Eisenwerke, Abteilung Geiger'sche Fabrik. May 9, 1922. Travelling-band strainers.-An endless band is formed of strainer frames 1 suspended from bolts 5, which connect and form pivots for the links of chains 3 on either side of the band which transmit motion to the band. The frames form a closed straining surface on the forward side of the band, a stop-bar on the free end of each frame bearing on the curved pivoted end of the adjacent frame. The frames on the return side of the band turn on the pivots in a rearward and downward direction, so that the purified liquid can flow freely between them. The band is placed across a water-channel in an inclined position, rollers 4 on the ends of the bolts 5 engaging guide rails 6 on the sides of the channel. The upper portion of the forward side of the band is guided in an approximately vertical direction and overhangs slightly at the front, so that each frame swings forward as its free end is raised over the edge of a trough 10 into which impurities collected by the frame are washed by jets of water from pipes 11, 12. On the other side of the band the frames pivot backwards against buffers 14, and any matter still adhering to the frames is caused to fall into a gutter 15. In order to increase the effective straining area, the lower end of the band is guided in an approximately horizontal direction as shown in Fig. 2. Closure between the band and the bottom of the watercourse may be effected by means of a hinged sill 18, vertically adjustable in guides 19 and provided with an elastic strip 20 which rests against the band and can rise slightly to allow passage of projecting cross-bars 13 fixed to some or all of the bolts 5. The bars 13 lift any bulky impurities separated from the water. These matters are pushed from each bar 13 into the trough 10 by the bar 9 on the frame immediately above, as the latter swings outwardly over the trough. As shown in Fig. 7, the bars 13 make closure between the band and the bottom of the channel as they slide over a metal covering 23 on a break or step on the bottom of the channel, which is curved similarly to the corresponding portion of the guides 6. Closure at the sides of the band may be made by yielding strips which are secured to the guide rails 6 and bear on the sides of the frames 2, or by metal strips 24, Fig. 8, fixed to the sides to the frames, and sliding along the flanges of strips 25 fixed to the guides 6. The band is driven by an electromotor 26 the motion of which is transmitted to chain-wheels 7 by spur, worm and chain gearing.