US642016A - Crushing-mill. - Google Patents

Description

No. 642,0l6. Patented Ian. 23, I900. T. L. 81. T. J. STURTEVANT.

CRUSHING MILL.

(Application filed May 18, 1899.1

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@X wmww f6 yw No. 642,05. Patented Ian. 23, I900. T. L. 8:. T. J. STURTEVANT.

CRUSHING MILL.

(Application filed May 18. 1899) (No Model.) 4 Sheets-Sheet 2.

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No. MZJJIG. Patented Jan. 23, I900.

T. L. & T. J. STURTEVANT.

CRUSHING MILL.

(Application filed may 18, 1899.)

4 Sheets-Sheet 3.

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No. 642,fi|6. Patented Jan. 23, I900.

T. L. 8:. T. J. STURTEVANT.

CRUSHJNG MILL.

(Application filed May 18. 1899.) Modem 4 Sheets-Sheet Qmmmw a 6 26% vs no, wom Lmh) WASHINGTON u c TTis STATES PATENT OFFICE.

THOMAS L. STURTEVANT, OF QUINCY, AND THOMAS J. STURTEVANT, OF

NEWTON, MASSACHUSETTS.

CRUSHlNG-MILL.

SPECIFICATION forming part of Letters Patent No. 642,016, dated January 23, 1900.

Application filed May 18, 1899. Serial No. 717,348. (No model.)

To all whom it may concern:

Be it known that we, THOMAS L. STURTE-' roller-crushers, in which a crushing-roll working against a second roll or a stationary anvil-surface crushes and reduces the ore or material, which is fed between them from a hopper or suitable feeding-ways.

The essential feature of ourinvention con-' sists in the novel construction of the crushing-roll, which will be called hereinafter the hammerroll,for the reason that in its construction the roll employs a series of radially or inwardly and outwardly movable pivoted hammers which are circumferentially placed with respect to the ro1l-shaft and which when the shaft is running at high speed are held projected by centrifugal force and strike a succession of blows upon the opposing roll, which maybe of similar or ordinary construction. Itwill be understood that the radiallymovable hammers carried by the hammer roll or rolls not only strike radial pinching blows, due to their centrifugal projection, but also deliver tangential blows upon the material as they approach the opposing member. The result of this action is the crushing of the material between the hammer-roll and the opposing member by a succession of blows from the pivoted hammers, which pinch and pulverize the material between the hammerfaces and the opposing member, and yet on account of the radial movement of the hammers and the yielding or flexible construction of the hammer roll or rolls the crushing strain is not transmitted directly to the driving shafts of the rolls and to the machine'frame, thereby providing a machine in which there will be less friction on the shafts and less strain on the m achine-frame and the bearings than where the crushing-faces of the rolls, as in ordinary roller-crushers, are unyielding and crush the material entirely by a pinching action, our improvements thus permitting a much lighter frame construction than in ordinary roller-crushers.

In the accompanying drawings, Figure 1 is a side elevation of a mill in which our improved erushing-roll opposed to an anvil-roll is utilized, this view showing the bearings and relative positions of the parts. Fig. 2 is a central vertical section of the mill shownin Fig. 1. Fig. 3 is an elevation, partly in vertical section, on line 3 3 of Fig. 2. Fig. 4 is a view of the hammer-roll and anvil-roll, showing the rolls adjusted closerto each other than in Fig. 2. Fig. 5is a centralvertical section of a mill employing two hammer-rolls. Fig. 6 is an end view of a modified form of hammer-roll, and Fig. 7 is a detail View of the same. Fig. 8 is a detail view of a form of hammer which will be referred to hereinafter.

Referring to the drawings, B denotes the lower half of the mill-casing, provided with a suitable discharge-opening and which casing B will in practice be mounted on suitable supports.

0 is the upper half of the mill-casing, said upper casing being bolted to the lower casing 13 by bolts 0 in order that the upper casing may be readily removed to permit access to the rolls.

D is the feeding-hopper, which is of ordinary construction and is seated in a hopperopening in the top of easing C, said hopper D being preferably provided with an adj ustable plate (l, by means of which the feed of the material may be regulated as desired.

Mounted on suitablysupported bearingblocks 1) are shaft-boxes or journal-bearings Z), one of which is adjustably secured on its blocks 1) by means of the bolts 1), as shown in Fig. 1, shims 11 being provided to allow adjustment of one set of the boxes I) and the shaft journaled therein toward and from the other shaft. The blocks 7) are preferably bolted together by means of the tie-rods I). (See Fig. 1.) Journaled in the boxes I? are the roller-shafts E E, each of which is provided with a driving-pulley 6 The shaft E has keyed to it, as shown in Fig. 2, a crushing-roll having a barrel 6 and the hard crushing-tire c, this roll forming what we term the anvil-roll, since it receives the blows of the hammers mounted in the hammer-roll, which is-supported by shaft E.

Mounted on the shaft E is the flanged hub F, and between the flangesfof said hub are pivoted the hammers f, said hammers being provided with slots f through which pass the pivot-bolts f each of these pivot-bolts extending across the roll and supporting a series of hammers. As shown in Fig. 2, these hammers are mounted circumferentially about the flanged hub f, so that they form substantially a continuous face, and when the roll is being rotated rapidly the said hammers f are thrown outwardly by centrifugal force and strike and pinch the material fed from the hopper D between the hammer-roll and the anvil-roll. The result of such action is to thoroughly crush and pulverize the material, and yet any severe strain upon the shafts E E is avoided, for the reason that the hammers yield and move inwardly after delivering their blows, so that the strain is taken off the bearings and mill-casing.

By adjusting the rolls toward and from each other the action of the crushing-ham mers may be increased or diminished, as desired, for, as shown in Fig. 4, it will be seen that by moving the rolls closer together the number of the hammers in action, and consequently the crushing power of the mill, is increased.

In the type of mill shown in Fig. 5 the anvilroll is dispensed with and two hammer-rolls are employed, as hereinbefore suggested, the second hammer-roll being mounted on the shaft E and taking the place of the anvil-roll shown in Fig. 2, both of the said hammerrolls having radially or inwardly and outwardly movable hammers or weights f, having slots f for the reception of pivot-boltsf Instead of slotting the hammers they may be provided with trunnions f as shown in Figs. 6 and7, and in the construction shown in these figures the trunnions pass through slots f in aseries of removable disks f which are mounted on the hammer-roll shaft E and held together by tie-bolts f to allow of their ready removal for insertion of the hammers, suitable'spacimar-collarsf being interposed between the disks f In Fig. 8 is shown a hammer I, provided with a slightly-concaved face i, which is especially adapted for use with the anvil-roll used in the type of mill shown in Fig. 2. When this concave-faced hammer I is u sed,a greater amount of material is caught and crushed between the face of the hammer and the anvilroll than when a hammer having a convex face, such as shown in the other figures, is employed. If desired, coil-springs i Fig. 8,

may be inserted in the slots f of the hammers so that they will be normally held extended, or rubber blocks may be employed instead of said springs. This, however, is not essential, for as soon as the mill is started centrifugal action carries the hammers outward to their normal projected positions.

We do not wish to be understood as limiting our invention to the details herein shown, as these may be varied widely within the province of mechanical skill, as will be understood.

Having thus described our invention, we claim and desire to secure by Letters Patent 1. In a crushing-mill, the combination with an opposing roll, of a crushing hammer-roll provided with a series of pivoted hammers having slotted connections with the body of said hammer-roll, whereby the said hammers are adapted to strike yielding blows and to be projected outward by centrifugal force, during rotation, to crush the material between them and the periphery of said opposing roll, said slotted connections permitting said hammers to yield inwardly to excessive resistance.

2. In a crushing-mill, the combination with an opposing roll, of a crushing hammer-roll provided with a series of pivoted hammers having slotted connections with the body of said hammer-roll, whereby the said hammers are adapted to strike yielding blows and to be projected outward by centrifugal force, during rotation, to crush the material between them and the periphery of said opposing roll, said slotted connections permitting said hammers to yield inwardly to excessive resistance, and means for adjusting one of said rolls relative to the other.

3. In a crushing-mill, the combination with a hammer-roll having a practically continuous, yielding or flexible, acting face composed of a series of pivoted hammers having slotted connections with the body of said roll and adapted to be held projected outward when the machine is running by centrifugal force, of an opposing roll between the periphery of which and the said hammers the material is crushed by the conjoint action of said hammers and opposing roll.

4. In a crushing-mill, two cooperating rolls the acting faces of both of which consist of practically continuous, yielding or flexible, acting faces composed of pivoted and inwardly and outwardly or radially movable hammers or weights adapted to be held outwardly, or toward each other, by centrifugal force, to crush the material between the said hammers or weights, and to yield inwardly to excessive resistance.

5. In a crushing-mill, the combination with a hammer-roll having a yielding or flexible, acting face composed of a series of hammers or weights which are inwardly and outwardly Iran movable bocli1y,'and which are adapted to be held projected outward, by centrifugal force, when the machine is running, and which are also adapted to yield inwardly to excessive resistance, of an opposing roll between the periphery of which and the said hammers or weights the material is crushed.

In testimony whereof we affix our signatures in the presence of two witnesses.

THOMAS L. STURTEVANT. THOMAS J. STURTEVANT. Witnesses:

W. H. ELLIS, FRED W. CONNOLLY.

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