US1989373A - Chainless traveling grate - Google Patents

Description

Jan. 29, 1935. M. LlNlGER V GHAINLESS TRAVELING GRATE Filed April 5, 1932 Ink/ERITEI EIGDBEIEIE rammmmmcmaaamm B Patented Jan. 29, 1935 p 1,989,373 onAlNtnss TRAVELING'GRATE Max Linig er; Wisp, Switzerland Application April 5, 1932, Serial No. 603,244

, In Germany April 10,1931; r

1 Claim. (01. -40) This invention relates to chainless traveling grates of the kind comprisinga series of individually movable fire bars which are advanced into the furnace along an upper track and are returned along a lower'track, the bars extending transversely with respect to their direction of movement along the tracks.

It has hitherto been proposed to provide a traveling grate with loose rectangular fire bars, which, after passing into the furnace drop down at the inner end of .the grate and are returned to the outer end by an endless chain, the bars being thereupon raised by means of cranked discs, connecting rods and cross rails to the level of the grate and again fed into the furnace. In some cases instead of an endless chain being employed pushers cooperating with a movable flap have been proposed for moving the fire bars along the lower track. Such grates are not only liable to be complicated in structure but in addition usually occupy a considerable-height.

On the other hand when loose fire bars wedge-shaped in cross-section are fed intermittently by means of a longitudinally adjustable reciprocating frame acting through tappets the grate is again relatively complicated and comprises a large number of moving parts. The present invention has for its object to provide an improved and simplified form of chainless traveling grate.

In a grate according to the present invention fire bars, with a cross-sectional width substantially equal to their cross-sectional height, fall through a downwardly directed guide into the path of a feeding device, preferably in the form of a pusher, which acts on each bar in turn when it has reached the bottom of the downwardly directed guide and thus feeds the bars through a curved return guide to the outer end of the upper track. Preferably that part of each fire bar which engages the tracks has a cross-sectional width substantially equal to its cross-sectional height so that whatever surface of each fire bar is lowermost after the bar has passed through the downwardly directed guide the bars will together form a substantially symmetrical surface as they pass along the upper track.

Conveniently a single downwardly directed guide is provided through which each bar falls in turn as it reaches the outer end of the lower track into the path of a feeding device, the bars preferably passing from the outer end of the lower track along a curved interconnecting track to the outer end of the upper track.

The bars may also fall in succession through a downwardly directed guide from the inner end of the upper track to the inner end of the lower track into the pathof a feeding device "which acts on them in turn and thus'feeds them along the lower track, the bars then falling in turn from the lower track through a second downwardly directed guide into the path of a second feeding device which feeds the bars through'a curved return guide to the outer end of the upper track.

Three constructions of traveling grate according to the present'invention are illustrated somewhat diagrammatically and by way of examplein the accompanying drawing, in which Figure 1 is a section through the grateon a line parallel to the direction of movement of the firebars,

Figure 2 is a section at right angles to that of Figure 1, I

Figure 3 illustrates a "similar construction slightly modified, i

Figure 4 shows in plan and on an'enlarged scale three of the grate bars, v

Figures 5 and 6 illustrate respectively t o further constructions of grate,

Fig. .7 is a view of the clinker scraper. I,

In the construction illustrated in Figures 1 and 2 the individually movable fire bars 2 are advanced into the furnace along an upper track 7 and withdrawn therefrom along a lower track 15. The bars pass from the inner end'of the upper track 7 through a downwardly directed guide 12 to the inner end of the lower track 15, and from the outer end of this lower track through a second downwardly directed guide 16 to the lower end of a curved return guide 1 the upper end of which registers with the outer end of the upper track 7. As each of the bars 2 reaches the lower end of the downwardly directed guide 16 the bar is acted upon by a feed device in the form of a pusher 3 driven by a rod 5 through guides 4, the lowermost bar in the guide 16 which is thus fed into the curved return guide 1 being prevented from moving in the reverse direction by a latch 6. Similarly, as each bar reaches the bottom of the downwardly directed guide 12 the bar is acted upon by a pusher 13 which is reciprocated by a rod 14.

Thus, when the grade is in operation the fire bars are intermittently advanced by the pushers 3 and 13 so that as one bar is fed into the lower end of the curved guide 1 the bars in this curved guide and in the upper track 7 are fed forward by a distance substantially equal to the width of one bar. The last bar at the inner end of the upper track 7 thus falls down the downwardly directed guide 12 and lies in the path of the pusher 13. The pusher 13 then feeds this bar in the outward direction along the lower track 15 whereby these bars are all moved through a distance substantially equal to the width of one bar thereby causing the bar on the outer end of the lower track 15 to fall down the downwardly directed guide16 a Fuel fed by a hopper 8 is in this way carried into the furnace 10 which is provided with a masonry lining 11 and wherein the fuel is burnt, the depth of the fuel fed by the grate being adjusted by means of a member 91" The fire bars 2 in their outward passage along the lower track 15 carry out the ashes with them and, if desired,

means may be provided for stripping off clinker which is carried out by the fire bars. Thus, as shown in Figure 3 a worm conveyer 27 maybe provided below the fire bars and adapted to convey clinker from the inner end of the grate to the outer end.

y The fire bars 2 are clearly shown in Figure 4 from which it will be seen that the ends of each bar which engage the tracks and guides are substantially square, the intermediate portion of each bar being so formed that when several bars are arranged side by side openings are formed for the passage of combustion air. It will be seen that since each end of each bar which engages the tracks and guides, has a crosssectional width substantially equal to its crosssectional height itis immaterial which surface of the bar is lowermost as the bar travel-s along the track since whatever the position of the bar a substantially symmetrical surface will be formed on the upper track.

In the constructionillustrated in Figure 5 the outer ends of the upper track 37 and lower track 37' are connected by a curved return guide 48 whilst the inner ends of the upper and lower tracks are connected by a downwardly directed guide 42. The rod 44 of the pusher 43 is guided in guides 49 and 50 and is reciprocated so that the pusher engages the fire bar 52 which lies at the inner end of the lower track 57' and moves all the fire bars along the lower track 57' curved guide 48 and upper track 57, whereby the bar at the inner end of the upper track falls down the downwardly directed guide 42. In this way all the fire bars 52 are simultaneously fed forward by the single pusher 43. A device 21, shown in Fig. '7, is provided for stripping to one side clinker from the bars 52 as these leave the lower track 57'.

Figure 6 illustrates a modified construction in which the inner ends of the upper track 57 and lower track 57' are connected by a curved interconnecting track 62, the fire bars 52 passing from the outer end of the lower track 57' along a curved downwardly directed guide 64 so as to fall in succession in the path of the pusher 53. In this construction each bar as it reaches the bottom of the downwardly directed guide 64 is engaged by the pusher 53 and is fed into the curved return guide 63 whereby all the bars in the curved guide 63, upper track 57, interconnecting track 62' and lower track 57 are fed forward by a distance equal to the diameter of one bar. As in the construction illustrated in Figures 1 and 2 the bars 2 which have been fed into the curved guide 18 are latched against reverse movement by means of the latch .56. Since a part of the length of the guide 64 is unoccupied clinker may be removed from the fire bars as they pass through this portion of the guide.

It will be seen that in a grate according to the invention each downwardly directed guide provides a space which allows for expansion of the fire bars due to variations in the temperature and at the same time facilitates the replacement or the addition of bars.

It will be understood that the constructions above described may be modified without departing from the invention.

I claim:-

In a chainless traveling grate of the kind set forth, the combination with upper and lower tracks, of fire bars supported by and movable along said tracks, that part of each bar which engages the tracks having a cross-sectional width substantially equal to its cross-sectional height, a downwardly directed guide through which the bars fall insuccession from the inner end of the upper track to the inner end of the lower track, a feeding device which acts on said bars to feed them along the lower track, a second downwardly directed guide through which the bars fall in turn from the lower track, a second feeding device, and a curved return guide connecting the outer end of the upper track and the lower end of said second mentioned downwardly directed guide through which the bars are fed by the second feeding device to the outer end of the upper track.

MAX LINIGER.

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