US1360466A - Crushing-mill - Google Patents

Description

T. J. STURTEVANT.

v CRUSHING MILL.

APPLICATION FILED JUNE I5, 1917.

.1 360,466. Patented Nov. 30, 1920.

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CRUSHING MILL.

APPLICATION FILED JUNE I5. 1917.

,4 Patented Nov. 30, 1920.

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37 67 f OD-51 T. J. STURTEVANT.

CRUS'HING MILL.

APPLICATION FILED JUNE I5. 1917.

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. THOMAS J. STURTEVANT, or WELLESLEY, MASSACHUSETTS, ASSIGNOR, BY MESNE ASSIGNMENTS, TO STURTEVANT MILL COMPANY, 015 BOSTON, MASSACHUSETTS, A

CORPORATION OF MASSACHUSETTS.

CRUSHING-MILL.

Application filed June 15, 1917. Serial No. 174,875.

To all whom it may concern Be it known that I, THOMAS J. STURTE- VANT, a citizen of the United States, residing at lVellesley, county of Norfolk, and State of Massachusetts, have invented an Improvement in. CrushingMills, of which the following description, in connection with the accompanying drawings, is a specification, like characters on the drawings representing like parts.

The invention hereinafter described relates to crushing mills for reducing materials, of the general class shown in Letters Patent of the United States, No. 995,580, dated June 20, 1911; No. 1,000,457, dated August 15, 1911; and No. 1,105,713, dated August 4, 1914.

A mill of this class comprises a plurality of crusher rolls on'carriers having arms projecting radially inward to engage a cen-' tral floating washer having a pivotal bearing on an adjustable pin carried by a spider, the arms of which are drawn inward toward the ring by helical springs.

The rolls, carriers, washer, spider and springs are all mounted on and supported by a head or door which is hinged to the casing containing the ring and rolls.

These mills experience very'heavy duty and sometimes operate under a pressureof several tons. Consequently, the parts must be of massive, expensive construction.-

One of the objects'of the'prcsent invention is to reduce the number of parts and the mass carried by the door, and provide a mill which is simpler, lighter and cheaper to manufacture than the mills shown in said patents. I

lVhen upper and lower crusher rolls are used, gravity tends to pull the upper roll away from the inner surface of the ring, while it tends to pull the lower roll toward the ring. Heretofore, supplemental springs,

such, for example, as shown in the aforesaid Letters Patent, No. 1,105,? 13, have been provided for the rolls to counteract the effect of gravity thereon.

Another object of the present invention is to provide means forindependently varying the tension of the springs acting on the rolls, so that the pressure may be distributed to the rolls as desired, and the springs for the rolls may be adjusted to compensate for the effect of gravity thereon, and thereby eliminate the necessity for the supplemental springs referred to.

Specification of Letters Patent. Patented 0V. 30, 1920.

Another object of the invention is to provide means for pressing the rplls toward the ring, which will permit the door to be opened easily and readily for the inspection of'the parts in the casing and the parts carried by the door.

Stillanother object of the invention is to provide simple and effective means for ad-- justing the rolls toward or from the inner face of the ring to take up wear on the parts and vary the distanceof the rolls from the ring as desired.

WVith the aforesaid and other objects in View, the characterof the invention will be best understood by reference to the following description. of embodiments thereof shown in the accompanying drawings, wherein I v Figure 1 is a side elevation of a "crushing mill shown herein as embodying the invention;

Fig. 2 is a vertical section through the mill shown in Fig. 1; Fig. 3 is a side elevation of the mill;

, Fig. 4 is a vertical section taken on line 44=.ofF1g. 2;

Fig. 5 is a vertical section of form of the invention; and a Fig. 61s a side' elevation of the mechanism shown in Fig. 5.

porting a casing 3 containing an anvil ring 5 having a concave inner crushing face 7.

This ring is mounted on a spider 9 having a hub 11 fast on a shaft 13 journaled in bearings in standards 15 mounted on the basereferred to. The shaft hasa pulley 17 fast thereon whichmay be driven by a belt (not shown) from a suitable source of power.

One or more crusher rolls may be mounted within and cooperate with the anvil ring to crush material fed therebetween. In the.

present instance of the invention, three rolls 19 (Figs. 2 and 4) are shown having convex faces curved to conform to the concave face of the ring. These rolls are ournaled on carriers, in the presentinstance of the invention, in the form of shafts 21 projecting laterally outward from the casing and mounted in boss bearings 23 integral with yokes 25 a modified V I (Fig. 3) having ends journaled in bearings 27 mounted on the outer face of a head or door 29 movable to open and closed posi tions. To permit this movement of the door, it may have hinged arms 31 projecting therefrom above and resting on arms 33 integral with the casing. A hinge pin 35 projects through registering holes in said arms. The door may be secured in closed position by screws 37 projecting loosely through ears on said door and threaded into similar ears 011 said casing. One of these screws 37 may be longer than the others and project through elongated slots in its ears and be threaded to a nut 37* set in a recess in the car on the casing to facilitate closing of thedoor, as more fully hereinafter described. To facilitate opening of the door, a screw 39 may be provided threaded in an extension 41 of the ear for the screw 37* and adapted to bear and react against an abutment on the casing. The roll carriers pivotally mounted on the door as described will permit the rolls to move toward and from the inner face of the ring. Next will be described the means for pressing the rolls toward the ring. To accomplish this, each carrier may have an arm at?) (Figs. 1, 2 and projecting radially outward beyond the casing and having its free end engaging the outer end of a pin 45, the inner end of which is rounded and seated in the socket of a plunger l? in a cylinder 49 mounted on the outer face of the'casing. .his plunger is pressed toward the right of Fig. 2 by a helical spring 51 mounted in said socket. The tension of said spring mayv be varied by a screw 58 threaded in an end of said cylinder and engaging a disk 55 bearing against the spring. The movement of the spring toward the carrier-may be limited by a head 57 detachably secured to said cylinder, and having a neck 59 projecting there-- from to contribute to the support of the pin,

as more fully hereinafter described.

By the construction described, the helical springs will operate through the pins 5 and carrier arms 4-3 to rock the carriers and press the crusher rolls outward toward the inner face of the ring. The springs may be so adjusted thatwhen the material to be crushed is fed between the ring and rolls, the latter will be moved inward away from the ring and rock their carriers against their springs and compress the latter with the tension required for producing efficient crushing pressure.

As stated, gravity tends to pull the upper roll away from the inner face of thering. and tends to pull the lower rolls toward. said. face. The screw and disk for the spring of the upper roll may be adjusted to apply a tension to said spring which is greater than the tension applied to the springs for the lower rolls, and thus counteract the effect of gravity on the. rolls ment of said. shaft will cause the eccentric portions to present their rolls nearer to or 7 5 farther from the ring as required. To secure the shafts in their different positions of rotative adjustment, each bearing may be provided with a'key 61 (Figs. 2 and 3) adapted to enter any of the key slots 63 distributed at intervals circumferentially of the shaft. The key may be held to prevent its sliding axially of the shaft by a set screw 65.

The carriers project through elongated openings 67 (Fig. 2) in the head to allow the rocking of the carriers. To prevent'escape of dust from the casing through said openings they may be covered by guard plates 69 movable with the carriers.

The material to be crushed may be fed into the mill through the usual hopper 71 (Fig. 1) and a spout 73, the latter being mounted on the door and directing the material to the inner surface of the ring.

hen it is desired to inspect or repair the parts within the casing and the parts carried by the door, the latter is swung on its hinges to its open position. To accomplish this, the screws 37 are released and then the opening screw 39 is adjusted to force the door ajar. Then the door may be swung to its open position, and in the course of this movement the carrier arms will move. automatically away from the spring-pressed pins 45. After the rolls have moved away from the ring, they may drop downward until their carriers are limited by the lower ends of the elongated slots in the door.

\Vhen it is desired tov close the door, it may be swung on its hinges back toward the casing, and in the course of this movement the carrier arms will automatically come into engagement with the pins L5, thereby rocking the rolls outward toward the die to their operative position. The screw 87 re ferred to is of sufficient length to catch into threaded engagement with the nut 37 before the rollsv are moved outwardly as described. This screw may be tightened and will afford sufiicient mechanical advantage to complete the closing movement of the door, and thereby rock the roll carriers away from the ends of the slots in the door supporting them while the door is open.

In the modification shown'in Figs. 5 and 6. a somewhat different mechanism is provided for pressing the crusher rolls outward toward the die. Each carrier is pivotally connected to a yoke 75 having an adustlng screw 7! bearing on the outer free end of an arm 7 9 pivoted on a bracket 81 on a plate 82- mounted on the casing. The arm is urged outwardly by a helical spring 83 confined between socket 85 on the arm and the outer face of said plate. To limit outward movement of said arm, a belt 87 may be provided having a head seated in a recess beneath a boss 89 on said plate, said bolt pro ecting upward through said spring and mit the okes to be rocked outwardly away from the arms 79. Then the door may be swung on its hinges to its open position as.

described. The door may be closed as before, and then the yokes are swung inward to the free ends of the arms, and the screws '77 are tightened sufficiently to return to their original positions of adjustment. The adjusting screws 77' and 87 may be set in different positions to vary the effective ten sion of the springs on the rolls as desired.

It will be observed that by the constructions described the door is relieved from the burden of supporting the springs, the heavy spider and the washer which are mounted on the door in the mills shown in the aforesaid patents. Also, this permits the carriers and the door to be of lighter simpler construction. In fact, the entire organization may be of a lighter, simpler construction, the parts of which are cheaper to manufacture and easier to assemble and operate.

I It will be understood that the invention is not limited to the specific embodiments shown, but that various deviations may be made therefrom without departing from the spirit and scope of the appended. claims.

Claims.

1!... In a crushing mill, the combination of a casing, a head thereon movable to open and closed positions, hinge means connecting said head with said casing, an anvil ring mounted in said casing, a plurality of crusher rolls opposed to the inner face ott said ring, carriers for said rolls pivotally mounted on and supported by said headto swing with the latter as it moves to open and closed positions, and spring-pressed members mounted on said casing, acting on said carriers to press said rolls toward said ring, said spring-pressed members and car riers having provision for automatically separating on movement of said head to open position, and for automatically operatively engaging on movement of said head to closed position.

2. In a crushing mill, the combination of a casing, a head thereon movable to open and closed positions, hinge means connecting said head with said casing, an anvil ring; mounted in said casing, a plurality of crusher rolls opposed to the inner face of said ring, carriers for said rolls pivotal'ly mounted on and supported by said head to swing with the latter as it moves to open and closed positions, and spring-pressedmembers mounted on said casing, acting on said I carriers topress said rolls toward said ring, said carriers being movable to engage and automatically tension said spring-pressed membersv on closing movement of said door.

8. In a crushing mill, the combination of a'casing, a head thereon movable to open and closed positions, hinge means connects ing said head with said casing, an anvil ring mounted in said casing, a plurality of crusher rolls opposed to the inner face of said ring, carriers for said rolls pivotally mounted on said head and having outwardly projecting arms, members mounted on said casing adjacent said arms, and springs for pressing said members toward said arms to move the rolls toward said ring, said arms being movable on opening movement of said head to reduce tension on said springs and then separate from said members. 7

4. In a crushing mill, the combination of a casing having a door hinged thereto adapted to swing to open and closed positions, an'anvil ring mountedin said casing,

a carrier pivotally mounted on said door having a shaftprojectinginto said casing, and an arm projecting outwardly externally of said casing, a'roll on said shaft for cooperation with said ring to reduce materials fed between them, a member mounted on said casing adjacent said arm, and spring means for pressing said member into engagement with said armto move said roll toward said ring, said arm being automati cally movable into and out of engagement with said member incidentally to closing and opening movements of said door.

5. Ina crushing mill, the combination of a casing, a cylinder mounted thereon, a pin projecting outwardly from one end of said cylinder, a coil spring mounted in said cylinder for pressing said pinoutwardly through said end, a door hinged to said cas ing, an anvilring mounted in said casing. a carrier pivotally mounted on said'door and 'movable therewith, and a roll on said carrier cooperating withsaid ring to reduce THOMAS J. STURTEVANT,

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