US1350626A - Separator - Google Patents

Description

T. J. STURTEVANT.

SEPARATOR.

APPLICATION FILED AUG-24. 1917.

1 ,350,626. Patented Aug. 24, 1920.

2 SHEETSSHEET l.

Invenior: M A

UNITED STATES- PATENT OFFICE.

THOMAS J. STURTEVANT, or WELLESLEY, MASSACHUSETTS, ASSIGNOR TO STURTE- MASS., A CORPORATION or MASSACHUSETTS.

VANT MILL COMPANY, OF BOSTON,

SEPARATOR.

Application filed July 24, 1917. Serial No. 182,407.

To all whom it may concern:

Be-it known that I, THOMAS J. STUKTE- VANT, a citizen of the United States, residing at lVellesley, county of Norfolk, and State of Massachusetts, have invented an' Tm provement in Separators, 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 separators for grading materials, and is an improvement upon the separator shown in my application, Serial N 0. 173,7 84, filed June 9, 1917.

This separator comprises an inclined casing containing screens which are percussively vibrated to facilitate the flow of the material to be graded along and through-the screens. It is desirable to have convenient access to the screens for the purpose of inspection, replacement and repair thereof.

One of the objects of the invention is to provide simple and eifective means for percussively vibrating'the screens, which may be liftedwith the cover of the casing when the latter is opened. v

Another object of the; invention is to provide an improved mechanism for percussively vibrating a screen, which will permit blows of different force to be imparted thereto, and thereby increase the etliciency of the screening action.

The means for percussively vibrating the screen shown in said patent, comprises swinging hammers pivotally connected to a rotor, and adapted to strike the end of a pin projecting down through the cover toward In the operation of this mechanism,'on commencement of the rotation of the hammers or on slow rotation thereof, there is a tendency for their ends to abut against the upper end of the pin andhave an end thrust against the same whlch may react and tend to lift the cover from the casing.

Still another object of the invention is to provide a hammer mechanism having means for preventing the occurrence of this.

WVith the aforesaid and other objects in view, the character of the invention may be best understood by reference to the following' description of one good form thereof, shown in the accompanying drawings, wherein: V

Figure 1 is a vertical. section through the Specification of Letters Patent.

Patented Aug. 2 1-, 1920.

separator shown herein as embodying the invention, the open position of the cover being indicated by broken lines;

Fig. 2 is a transverse section taken on line 22 of Fig. 1;

Fig. 3 on an enlarged scale is a vertical section showing the hammer mechanism and portions of the casing cover and screens;

Fig. 4 is asectional. detail of the pin for transmitting the blows from the hammers to the lower screen;

- Fig. 5 is a vertical 5-5 of Fig. 4;

Fig. 6 is a transverse section taken on line 6-6 of Fig. 1;

Fig. 7 is a diagram showing the sequence of hammer blows for the lower screen; and

F ig. 8 is a diagram showing the sequence of blows for the upper screen.

Referring to the drawings, the separator shown therein as embodying the invention comprises an inclined casing 1 mounted on a support 3 and having a cover 5 connected at its upper end by hinges 7 with the casing. The lower free endof the cover is adapted to rest upon a bar 11 extending transversely of the casing adjacent the lower end thereof.

One or more screens may be mounted in this casing; in the present instance of the invention, a lower fine screen 13 is provided resting on springs 15 on supports 17 on the bottom of the casing. An upper coarse or scalper screen 21 is mounted in the casing above the lower screen, and is suspended from the cover by hangers 23 (Fig. 2).

The mechanism for pcrcussively vibrating the screens comprises rotors 25, in the present instance of the invention, in the form of splitv hubs fast on horizontal shafts 27 journaled in bearings in brackets 31 mounted on the cover. Each of these rotors has strikers or hammers 33 pivotally connected thereto section taken on line adapted to be carried around by said rotor and impart successive blows To transmit these blows to the screens, members or pins 35 .may be provided projecting through rotors are disposed on their shafts at an-.

brackets 47 mounted on the cover, as shown ,in said applicatlon.

To rotate the hammer shafts, they may have sprocket wheels 19 fast thereon c011 gular intervals of advance, and the sprocket two shafts positively maintains the latter in predetermined rotative relation.- 1 V In the present instance of the invention, six rotors are provided, three on each shaft, two. of which vibrate the upper screen and four of which vibrate the lower screen' The two rotorsfor the uppe'rscreen are mounted on the upper and lower shafts 180 apart, (Fig. 8) so that their-hammers strike blows at 90 angular intervals. The four rotors for vibrating the lower screen are disposed on their shafts at angular intervals of 90, (Fig. 7) and the eight hammers carried bysaid rotors will strike their blows at 45 angular intervals. The rotors may be so arranged that the first two blows will strike the upper part of the screen, the next two blows will strike the lower part of the screen, the next two blows will strike the upper part of the screen, and the next two blows will strike the lower part of the screen.

"A desirable order of sequence for. the blows for the-upper screen'is designated by the numbers 1 to 4. at the ends of the hammers shown in'l ig. Sgand for the lower screen by the numbers 1 to 8 at theen'ds of. the hammers shown in Fig. 7.- a

The construction is such that the blows of the hammers will follow one another in succession and prevent occurrence of simultaneous blows on the screen. Thus, a highly desirable distribution of blows is maintained, and uniform vibratory effect assured.

In some cases it may be desirable to vary the foree of the alternate blows produced by the pair of hammers mounted on a rotor. To accomplish this, one of the hammers 33 is reduced at 33 so that'it may be substantially lighter than its companion.

Since these hammers swing freely from their pointswof pivotal COIIDGCtlOIi' with the rotor, their variation in weight will serve to produce blows of different force on the pin. V 7 1 p g The disposition of the hammers for the upper screen may be such that the first two blows willbe heavy and the second two blows will be light; and for the lower screen chain and wheel transmission between the venience.

through at a point aperture 59 the first four blows will be heavy and the last four blows will be light. The reoccurrence of the heavy and light blows will maintain the uniform vibratory effect on the screen. The heavier blows throw the material up from the screen and facilitate the flow of the material downalong the screen; Whereas, the lighter blows facilitate the passage of the material through the screen.

It is frequently desirable to rock the coverv of the casing upward (Fig. 1) on its hinges to permit inspection, repair or replacement of the screens. Since the upper screen is suspended by hangers from the cover, it is lifted therewith. 7 Thisseparates the upper screen from the lower screen, and permits convenientaccessto both. I

Heretofore it has been necessary to'remove the pins for transmitting the blows from the hammers to the lower screen before lifting the cover, owing to the lateral movement of the pins against the sockets in the lower screen tending to preventupward movement of the cover. The manual operation of through the cover and the replacement thereof is a source .of considerable incon- Next will be described means whereby these pins may be automatically lifted with the cover. To accomplish this, each pin may be provided with a stop, in the present instance of the invention, in the form of a cotter pin .57 projecting transversely thereslightly above the collar on the cover through which the pin passes. This cotter pin is a sufficient distance from said collarto prevent interference with'the movement of the pin in transmitting blows from the hammer to the screen, but when the cover is lifted, the pin will slip downward somewhat until the cotter pin engages the top of the collar, and then it will be carried upward with the cover. To render this movement possible, the socket for the lower screen may be provided with a lateral which will, allow the side movement of the pin and prevent its interfering with the lifting of the cover. The socket on the lower screen may be variously formed, provided it presents an upper wall ent instanceof the invention, in the form of lifting the several pins out screen.

pins 60, which are so located with to the hammers that they will limit ward rocking of the hammers into a position where they could have the end thrust engagement, referred to, when rotation of the hammers is commencing or is at a slow speed. During more rapid rotation of the hammers, there is not time for them to gravitate down into engagement with their stops; However, this simple device prevents any possibility of engagement of the hammers with the upper ends of the pins, in such a manner as to react on the hammer shafts and tend to lift the cover. I

To feed the material to be separated to the screen, the casing may be provided with a feed box 61 at the upper end thereof containing the usual feed screw 63 for conveying the material from one end of the box toward the other, and causing the same to flow over an adjustable feed board 65 and thence down onto a deflecting plate 67 for delivering the material into the space between the upper screen and the cover of the casing.

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

Claims:

1. A separator comprising in combination, a casing, a cover therefor, a screen mounted in said casing, means to percussively vibrate said screen including a member projecting down through said cover toward said screen, means automatically to lift said member from said screen on opening of said cover, and a socket on said screen receivingsaid member and having a lateral opening allowing side movement of said member as it is lifted.

2. A separator comprising in combination, a casing, a cover therefor, a lower screen mounted in said casing, an upper screen suspended from said cover, means to percussively vibrate said screens including a member projecting down through said upper screen to said lower screen, and means automatically to lift said member from said lower screen with said cover and upper respect down- 3. A separator comprising in combination, a casing, a cover therefor, a lower screen mounted in said casing independently of said cover, an upper screen suspended from said cover, means to percussively vibrate said screens including members projecting from said cover toward said upper screen, members projecting from said cover through said upper screen to said lower screen, and means for causing all of said members to move upward with said cover and upper screen when said cover is lifted to furnish access to said screens.

a. A separator comprising in combination, a casing, a cover therefor, a lower screen mounted in said casing independently of said cover, an upper screen suspended from said cover, means to percussively vibrate said screens including members projecting from said cover toward said screens, hammer means for striking successive blows to said members, and means for lifting said members with said cover and upper screen when the cover is lifted to furnish access to said screens.

5. A separator comprising in combination, a screen, and means to percussively vibrate said screen including a rotor, and

swinging hammers pivotally connected to said rotor,

one of said hammers being heavier than the other to impart blows to said screen of different force.

6. A separator comprising in combination, a screen, and means to percussively vibrate said screen including a rotor, swinging hammers pivotally connected to said rotor, one of said hammers being heavier than the other to impart successive blows of different force, and means to transmit said blows to said screen.

7. A separator comprising in combination, a screen, and means to percussively vibrate said screen including a rotor, and hammers carried by said rotor, one of said hammers being heavier than the other to impart successive blows to said screen of different force.

8. A separator comprising in combination, a screen, and means to percussively vibrate said screen including swing hammers havingprovision for alternately imparting blows to said screen of different force.

9. A separator comprising in combination, a screen, and means to percussively vibrate said screen including a pin, a rotor, swinging hammers pivotally connected to said rotor, and stop means on said rotor to limit the swinging movement of said hammers and prevent end thrust of said hammers on said pin.

10. A separator comprising in combination, a screen, and means to vibrate said screen including pins, and hammer means for striking the and light blows.

11. A separator comprising in combination, a casing comprising a rotor carrying a vibratory screen therein, and a vibrating mechanism on said casing, elements of different weights for imparting heavy and light blows to said screen.

In testimony whereof, I have signed my name to this specification.

THOMAS J. STURTEVANT.

pins with alternate heavy

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