US1200247A - Traveling grate. - Google Patents

Description

M. W. 'SEWALL.

TRAVELING GRATE. APPLICATION men ran. 3. 1913.

Patented Oct. 3

MINOTT W. SEWALL, OF NEW YORK, N. Y ASSIGNOR TO THE BABCOGK & WILCOX. COMPANY, OF BAYONNE, NEW JERSEY, A CORPORATION OF NEW JERSEY.

TRAVELING GRATE.

Specification of Letters Patent.

Patented Oct. 3, 1916.

To all whom it may concern Be it known that I, Mmo'r'r W. SEWALL, a

. citizen of the United States, residing at New York city, borough of Manhattan, in the county of New York and State of New York, have invented certain new and useful Improvements in Traveling Grates, of which the followingis a specification.-

My invention relates to traveling grates. As at present built, chain or traveling grates are usually mounted on a frame carried on wheels to enable the whole structure to be withdrawn from the furnace, in order that the repairs may be made to it. This has the advantage of making all partsaccessible, or, if it is drawn only part way, of making such part of it accessible as is withdrawn. Among the disadvantages attending the usual construction may be enumerated the following: (1) The stoker parts are inaccessible whenin place for operation; (2) If thestoker be a long one, great width of tire room is required; (3) The stoker frame, together with the supporting rail beams and pit between them, involve considerable expense; (4) There is a diiiioulty' in replacing links due to the longlink rods,

, sive to the customer, outside of the stoker especially if the boilers be in battery without excessively thick center walls; (5) The necessary conservation hoppers are expencosts; (6) A broken link sometimes breaks another part of the stoker before it is discovered or replaced; (7) The driving parts if properly protected from fire room dust are expensive; (8) The driving rig is mounted on the stoker frame and therefore mustbe easily detachable from the driving parts, common to-all of the stokers in the boiler plant or unit.

The object of the present invention is to overcome, so far as may be, the above mentioned disadvantages, and will be understood by reference to the accompanying drawings in which,

Figure 1 is a vertical longitudinal sect on of a furnace and traveling grate; Fig. 2, av transverse section on the plane of the line 2 2 of Fig. 15' Fig, 3, a, transverse section on the plane of the line 33 of Fig. 1, and Fig. 4, a partial sectional plan on the plane of the line 44 of- Fig. 1.

Similar reference "numerals indicate simi larparts in the several views...

Referring to the drawings the numeral :1

designates the furnace space of a steam boiled'in which the grate is placed, suflicient parts of the side walls and of the boiler setting being shown to facilitate an understanding of the application of the present invention. The lower side walls of the furnace are protected bya water cooling system described in my application Serial'No. 69 9, 860, filed May 27, 1912, this system comprising side water tubes 2 and side water boxes 8. Cross boxes 42 and 5 form the bridge wall of the furnace, said tubes and boxes being connected with the boiler circulation.

The traveling grate-which I have shown for the purpose of describing my invention conslstsof a grate surface made up of interlocking links 6 held in position by rods 7. Short link rods may be used which can be driven out into the space under the center wall by working in the passage way, enabling all links to be replaced 0.- the drag way instead of in front if preferred.

The fuel support consists of an endless web or belt passing around sprocket wheels 8 and 9, said wheels being mounted on shafts supported 1n suitable bearings. Fig. 3 shows the rear sprocket shaft 10 with one of its bearings 11. 'A screw jack 12 may be I used for raising or lowering the shaft, the

lower bearing of said jack restingon the.

' in bars 15, the latter beingnotched on their upper edges'to receive the rods. The bars 15 are attached to vertical supports 16 and these in turn are secured throughplates 17 to vertical supports 18, which latter are the supports for the boiler casing plates. By this construction side walls below the grate line are not required, plates installed for closing the space in, being substituted. v

The side water boxes 3 are spaced apart at least the distance of the width of the grate,

and the bottoms of the boxes are slightly above the upper surface of the grate. As shown in Figs. 2 and 3 these boxes are partially supported upon angle bars 25 secured to the vertical supports 16, said bars extending longitudinally along the sides of the grate links and serving to close the air space between the grate and the side water boxes.

For the lower or return run of the grate I provide a floor 19 independent of the grate structure an? upon which the return run rests as it is drawn to the front of the furnace. turn run of the grate between the sprockets is longer than the upper .or forward run of the grate between the sprockets so as to sa and conform to the shape of the fioor over which it travels. This floor may be constructed in any suitable manner and. of suitable material, such as concrete or with a sur face of concrete or similar building stuff, and is a part of the building structure, that is, it constitutes the furnace floor and is prepared as a part of the installation and is independent of the grate structure. It may lie in a horizontal plane, or may be inclined downwardly or upwardly from the rear to the front. As shown it begins a short distance in front of the rear sprocket wheels and terminates near the front of the furnace opening. that of the grate. To prevent undue wear of the floor 1 may embed therein metal strips 20. As the return run rests directly upon the floor I may install anti-friction wheels 21 built into the floor to reduce the friction.

Below the forward or discharge end of the floor 19 is a belt or otaer carrier 22 for conveying the sittings brought forward by the return run of the grate, these siftings falling through the upper run of the grate upon the floor.

From the foregoing description it will be seen that the usual practice of removing the stoker from under the boiler for repairs has been abandoned, there being sufiieient space between the upper and lower runs of the chain allowed for a man to enter for access As shown in Fig. 1 the lower or rc-.

Its width is substantially to all parts of the interior of the stolier, and to the inner ends of the rear shafts when a battery setting is used, by entering the space between the stokers under the center wall of the battery.

A shield 23 prevents refuse from "falling under the rear end of the grate and directs it to an auxiliary grate 24-.

What I claim and desire to secure by Let-- ters Patent of the United States is l. A traveling grate having a fuel-supporting surface, sprocket wheels around which the grate travels and a supporting floor for the lower or return run. the lower or return run of the grate between the sprockets being longer than the intiper or for ward run of the grate between the sprocl-iets so as to sag and conform. to the shape of tho floor over which it travels.

2. A traveling grate having a ituelsiupporting surface, sprocket wheels round which the grate travels, and a. sup iiorting floor for the lower or return run. said iioor sloping upward from the rear to the front, the lower or return run of the grate between the sprockets being longer than the upper or forward run of the grate between the sprockets so as to sag and conform to the shape of the floor over which it travels.

-3. A traveling grate having a fur porting surface. sprocket who which the grate travels. a support for the lower or return run, said floor sloping upward from the rear to the front and having metallic wear members, the lower or return run of the grate between the spro ets being longer than the upper or forward run of the grate between the spree rets so as to sag and conform to the shape of the iioor over which it travels;

In testimony whereof I have hereunto signed my name in the presence of two subscribing witnesses.

Witnesses J. E. BELL, Jenn A. W. DIXON.

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