US2299442A - Apparatus for spreading material over large surfaces - Google Patents

Description

Oct. 20, 1942. M. VOGEL-JORGENSEN 9,

APPARATUS FOR SPREADING MATERIAL OVER LARGE SURFACES Filed May 10, 1941 Q 2 Sheets-Sheet l zmmzw ATTORNEY-5.

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M. VOGEL-JORGENSEN APPARATUS FOR SPREADING MATERIAL OVER LARGE SURFACES Filed May 10, 1941 2 Sheets-Sheet 2 ATTORNEYS Patented Oct. 20, 1942 APPARATUS FOR SPREADING MATERIAL OVER LARGE SURFACES Mikael Vogel-Jorgensen, Copenhagen, Denmark, assignor to F. L. Smidth & 00., New York, N. Y., a corporation of New Jersey Application May 10, 1941, Serial No. 392,906 In Denmark May 31, 1940 4 Claims.

The present invention relates to an apparatus for spreading material over large plane surfaces, for instance, for spreading of material on an inclined plane support used in connection with the process described in my U. S. Patent No. 2,275,116, issued March 3, 1942.

My patent relates to a process of treating material by means of gases on an inclined support on which the material moves in an even layer without essential internal slides, the material being subjected to an action complete in the interior of the layer. It is essential for the working of the method described that the material be supplied to the inclined support in a uniform layer. Two arrangements by which this supply can be effected are, therefore, shown in the patent. According to the first arrangement, the material is spread on the support by means of scoops made fast to the lower end of a rotary kiln beneath which the support is arranged. According to the second arrangement, the material to be treated passes from the lower end of a rotary kiln, through a shaft, to the inclined support. In the shaft are arranged spreading elements, so that the material accumulating in the shaft is supplied evenly over the entire width of the support.

The present invention relates more particularly to a new apparatus for spreading material discharged from the lower end of a rotary kiln over an inclined plane support. By means of the new apparatus, the material, as it is discharged from the kiln, is so distributed on the support that no accumulation occurs. The thickness of the layer is thus determined by the quantity of material discharged from the kiln, as well as by the rate of speed at which the material is moved down the support. The material drops from the rotary kiln on to a bridge or the like arranged in a shaft over the support. This bridge is provided with a hole or holes, whence the material drops down on to another bridge, preferably placed horizontally. Over this bridge is moved back and forth a scraper plate pushing the material over the edges of the bridge.

I" separation of the material according to s1ze 1s avoided, and the apparatus is simpler in construction than those previously employed.

The invention and its practical embodiment are further described in the following, with reference to the accompanying drawings, in which Fig. 1 is a vertical section through an apparatus according to the invention,

Fig. 2 is a section on line IIII in Fig. 1,

Fig. 3 is a section on line III-III in Fig. 2,

Fig. 4 is a vertical section through an apparatus according to the invention,

Fig. 5 is a section on line V-V in Fig. 4.

Referring to the Figures 1 to 3, l is the lower end of a rotary kiln surrounded by a hood 2, through which the fuel pipe 3 is introduced into the rotary kiln. In continuation of the rotary kiln, and beneath it, an inclined gas-permeable support or grate 4 is arranged as a cooler for the material from the rotary kiln. This grate 4 is placed in an extension 2| of the hood 2, and air is passed through a conduit 23 to the room beneath the grate from which it further passes through the material on the grate for cooling it, whereafter part of the said air flows to the kiln and part of it escapes through a conduit 24. A set of bars I9 carried by pendulum-like bars 20 are positioned over the grate 4 and are moved by means of an eccentric 2|. The movement of the bars I9 causes the material to travel down the grate 4 from which it is delivered to a transporting apparatus 22. This whole method and apparatus are described in greater detail in my U. S. Patent No. 2,275,116.

Between the rotary kiln I and the inclined grate 4 a shaft 5 is formed by the refractory Walls 6 and 1. At the bottom the walls 6 and I are supported by hollow air-cooled beams, 8 and 9 respectively. In the shaft 5 is, according to the invention arranged a horizontal bridge ID with a hole II located at the vertical diam'etral plane 'of the kiln. Under the bridge I0 there is another horizontal bridge I2 fitted on each side with a part I3 inclining downwards. The said parts I3 are shaped as trapeziums and are widest at the top, Where they were connected with the horizontal part I2. Over the horizontal bridge 12 a scraper plate I 4 is moved back and forth by means of the rods I5 and IS. The motion is eiTected by means of the eccentric H, which is driven in a manner known per se.

The material from the rotary kiln I drops on to the horizontal bridge It and passes from there, through the central hole I I down on to the horizontal bridge I2. Thence the scraper plate I4 pushes it alternately to either side so that it passes down the inclined plates I3. Owing to the shape of these plates, the material falling next to the wall I (Fig. 3) will slide the longest way on the plates l3, and material falling closer to the wall 6 will gradually move a shorter stretch on the plates I3, dependent on the distance of the material from the wall I.

The inclined plates I8 are arranged in order that the material may also be spread under the horizontal bridge I2 itself. Some of the material from the bridge I2 is pushed. by the scraper. plate I4 down on to these plates I8; and hence it slides down on to the support 4 at the points thereof which are located beneaththe bridge l2.v Referring now to the Figs. 4'and 5, where the inclined gas-permeable support is placed at rightangles to the axial direction of the rotary kiln, 26 is the lower end of the rotary kiln surrounded by a hood 21 through which the flue pipe 23 is introduced into the rotary kiln. The said hood 2] is provided at its lower portion with a hole 28. Inclined walls near this hole lead the material towards the same. This lower part of. the. hood 2.! thus corresponds to theplate I in the Figs. 1 to 3.

Below the hood 21 a shaftis formed by the refractory walls 6'- and I. These walls are as by the former constructions at the bottom supported by hollow air-cooled beams 8 and 9- respectively. In the shaft 5' is as in Figs. 1 to 3 arranged a horizontal bridge I 2 fitted on each side with a part I 3' inclining downwards. The said parts I3 are shaped as described for the Figures l to 3. Again, over the horizontal bridge I2 a scraper plate. I4 is moved back. and. forth by means; of rods I5- and I6 and an eccentric II.

By means of the lower part of the hood 21 and through the. hole 28 the material from. the rotary'kilnis ledto the bridge. I2- from which the scraper plate l4,.as described for the Figs. 1 to 3.alternately pushes to either side, so that by meansof theplates l3 the material is distributed evenly over the width of the grate 4. Also inclinedplates I8 havingithe same function as described for. the Figs. 1 tov 3are provided'for the construction shown'in Figs. 4and 5. In these figures the grate 4 is surrounded by a casing to which air is led. through a. conduit 29 and from which it escapes through other conduits30 and 3| after having passed through the grate 4 and f the material on same. The material is moved over the grate 4 as before by means-of'the bars I9 carried by the pendulumelike' bars 20, andthe bars I9 are reciprocated by theeccentric'2l.

I claim:

1. Apparatus for feeding material to and spreading it laterally over a rectangular surface along which the material is to be moved longitudinally thereof, comprising a stationary support located above said surface intermediate its side edges, side plates inclined downwardly from said support, means for delivering the material to said support, a distributing device adapted to causeoutward movement of the material along said support in opposite directions and onto said side plates, such movement being toward the side edges-of said surface and transversely to the direction in which the material is to be moved over said surface, each of said side plates progressively decreasing in width downwardly to form a discharge edge over which the material which slides down such side plate drops onto said surface, the discharge edges of said side plates converging horizontally towards the median line of said. surface'and extending obliquelyv across. the same,

and onto said side plates, such movement being toward the side edges of said surface and transversely to the direction in which the material is to be moved over said surface, each of said side plates progressively decreasing in width downwardly to form a discharge edge over which the material which slides down such side plate drops toward said surface, the discharge edges of said side plates converging horizontally toward the median line of said surface and extending obliquely across the same, and plates below said side plates and arranged to catch a portion of the material which drops from the dischcarge: edges of the side plates, said last-named plates being inclined inwardly and downwardly to deliver the material caught by them towards the mid-portion of said surface under said support.

3. Apparatus for feeding material to and spreading it laterally over a rectangular surface along which the material is to be moved longitudinally of the surface, comprising a feed shaft located above said surface and having front and,

livering material into the shaft and onto said.

support, the material on saidsupport being confined by said front and. rear walls of the shaft but the support being shorter than. the distance between the side walls of the shaft, a stationary plate inclined downwardly from said support and extending toward one of the side walls of the shaft, means for moving the material off said support onto said downwardly inclined plate, said plate progressively decreasing in width downwardly to form a discharge edge over which the material which slides down the plate may drop onto said surface at points having different distances from said support, whereby the material which moves down said plate and falls over its said discharge edge onto said rectangular surface is distributed laterally thereover.

4. Apparatus for feeding material to and spreading it laterally over a rectangular surface along which the material is to be moved longitudinally of the surface, comprising a feed shaft located above said surface and having front and rear walls extending transversely of such surface and. end walls extending longitudinally of such surface, the longest horizontal dimension of said feed shaft extending transversely of said surface, a stationary support in said shaft, means for delivering material into the shaft and onto said support, the material on said support being confined by said front and rear walls of the shaft but the support being shorter than the distance between the side walls of. the shaft, a

stationary plate inclined downwardly from said.

walls of the shaft, a reciprocating device for moving the material off said support onto said downwardly inclined plate, an actuating rod connected to said device and extending through an end wall of the shaft, means located outside said shaft for reciprocating said rod, said downwardly inclined plate progressively decreasing in width downwardly to form a discharge edge over which the material which slides down the plate may drop onto said surface at points having different distances from said support, whereby the material which moves down said plate and falls over its said discharge edge onto said rectangular surface is distributed laterally thereover.

MIKAEL VOGEL-JORGENSEN.

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