US2836298A

US2836298A - Discharge chute attachment for symon vibrator screen

Info

Publication number: US2836298A
Application number: US545616A
Authority: US
Inventors: Tobin Francis John
Original assignee: Individual
Current assignee: Individual
Priority date: 1955-11-08
Filing date: 1955-11-08
Publication date: 1958-05-27
Anticipated expiration: 1975-05-27

Description

May 27, 1958 F. J. TOBIN 7 DISCHARGE CHUTE ATTACHMENT FOR SYMON VIBRATOR SCREEN Filed Nov. 8, 1955 2 Sheets-Sheet l INVENTOR Francis John Tobin ATTORNEB' F. J. TOBIN May 27, 1958 DISCHARGE CHUTE ATTACHMENT FOR SYMON VIBRATOR SCREEN Filed Nov. 8, 1955 2 Sheets-Sheet 2 INVENTOR Francis John Tobin BY W ATTORNEYs United States Patent DISCHARGE CHUTE ATTACHIVIENT FOR SYMON VIBRATOR SCREEN Francis John Tobin, Yakima, Wash.

Application November 8, 1955, Serial No. 545,616

2 Claims. (Cl. 209-257) The present invention relates to discharge chute attachment for Symon vibrator screen and is involved in the processing of sand and gravel to the end of screening and grading the same.

In the Symon machine a vibrating screen receives the gravel and due to its eccentric vibrating motion it imparts not only a shaking movement to the gravel but also a motion of translation along the screen from a receiving end to a discharging end thereof. Incident to this movement the sand and smaller rock are sifted through the meshes of the screen, leaving a residue of larger rock which must be disposed of. Heretofore this residue has simply been discharged by gravity over the discharge end of the Symon vibratory screen into a bunker, which has complicated any further handling of this material and made it impossible to have the larger residue or rocks elevated on conveyor lines.

It is an object of the present invention to provide a discharge chute attachment with means to afiix the same to the vibrating Symon screen so as to partake of the movement thereof which chute is arranged to receive the residue of rock at the end of the Symon screen and by reason of the vibrating action of the chute, the residue or rock is elevated over the eccentric drive at the end of the Symon screen onto a conveyor belt, from which point the residue or rock is carried to another or other vibrator screens where the same is re-screened and dumped into various grading hoppers.

It is another object of the invention to provide a chute in conjunction with a Symon vibratory screen, which chute will elevate the rock or by reason of its vibration vibrates the rock upgrade.

Heretofore it has not been feasible, particularly by conveyor belt methods, to convey this rock upgrade. The rock being somewhat round will roll down the conveyor belt and it is simply not practicable to convey this type of rock up hill on a conveyor belt.

It is therefore an important object of the invention to provide an upwardly inclined chute which will be vibrated back and forth longitudinally whereby the rock delivered thereupon will, by virtue of the vibration, automatically cause the rock to vibrate uphill through the chute which is vibrating at all times.

It is a further object of the invention to provide a discharge chute attachment of the kind described which will elevate rock from the Symon vibrator screen in a manner to by-pass the eccentric motion of the screen so that the rock will not go through the crusher but will be directed to segregation screens for sorting uncrushed rock for various sizes.

With the foregoing and other objects in view, the invention will be more fully described hereinafter, and will be more particularly pointed out in the claims appended hereto.

In the drawings, wherein like symbols refer to like or corresponding parts throughout the several views:

Figure 1 is a fragmentary perspective view of a Symon screening machine taken from the discharge end of the 2,836,298 Patented May 27, 1958 Symon vibrator screen and shown embodied thereina discharge chute attachment constructed in accordance with the present invention.

Figure 2 is a similar view looking toward the discharge end of the vibrator screen and into the receiving end of the discharge chute attachment of this invention.

Figure 3 is a fragmentary side elevational view of the Symon machine with parts broken away and parts shown in section and with the discharge chute attachment incorporated therein.

Figure 4 is a perspective view of the discharge chute attachment of this invention illustrating a preferred form of application to the Symon vibrator screen.

Referring more particularly to the drawings, 10 designates a'Symon vibrator screen, which is eccentric driven and 11 represents a conveyor for conveying the rocks to segregation screens or to a sorter or grader.

The improved discharge chute attachment comprises generally

side walls

12 and 13 and a bottom wall or plate 15 to which is affixed steel or other mesh screen 14. The

side walls

12 and 13 may be connected together for purposes of strength at or near their upper ends by a brace 16. Metallic or

other straps

17, 13 are welded or otherwise affixed to the

side walls

12 and 13, preferably in a diagonal direction so that in th supported tilted'position of the chute these straps will extend rearwardly at elevations above the upper edges of the

walls

12 and 13. The

straps

17 and 18 have twists 19 therein so as to change the flat dimensions of these braces from the vertical position in which they are attached to the

side walls

12 and 13 to a horizontal position for facilitating the hooked ends 20 of the straps being passed about the screen brace 21 which is a permanent portion of the Symon vibrator screen. Bolts 22 or other fastenings may be employed to retain the free ends of the

straps

17 and 18 upon the screen brace 21 as more particularly seen in Figure 3.

As appears to best advantage in Figures 2 and 4, the side walls or

plates

12, 13 flare or diverge outwardly at the receiving end of the chute into wings 23 which produce a funnel mouth for the chute and direct the rocks from the Symon screen into the chute, which latter is narrower than the Symon screen.

Bolts

24 and 25 may be passed through the wings 23 and into the side bars of the Symon screen for firmly attaching the chute to the screen. Preferably at least two bolts are employed at each side of the chute. v

Other bolts 26 pass through the floor or bottom or mesh of the chute and through the discharge end ofthe Symon screen. Preferably at least three of the bolts261 are employed in this connection, making the number of bolts employed to attach the chute to the Symon screen at least eleven which has been found to make a satisfactorily firm attachment for holding the screen in the inclined position shown in Figure 3 in which its receiving end is lowermost and its discharge end is considerably higher. The bottom or bed of the chute including the mesh screen 14 is thus on an inclination requiring the rock to move up this inclined chute by reason of the vibratory action and to be discharged ultimately at the high end of the chute on to an inclined apron 27 having side walls 28 secured by appropriate fastenings 29 to the

side walls

12, 13 of the chute. The apron 27 will deliver the rock to the conveyor 11 whence it will be carried to the segregation screens.

The steel or

other straps

17, 18 act as braces assisting to support the weight of the chute at its outer end from the brace 21 of the Symon screen. The steel or

other strap

17, 18 may be electrically welded to the

sides

12, 13 of the chute and are preferably not held by bolts. In this way elongated lengths of the

members

17 and 18 are affixed to large areas of the

side walls

12 and 13.

. screen 10 which conveys or vibrates them to the entrance 5 of the discharge chute attachment and with'the special speed of the screen the rocks run uphill up tlfefchute and drop to the segregation screens for sorting of sizes vas needed for different specification jobs.

Q The vibratory movementthat is 'commun icatedto the chute is one back and forth lengthw'ise of 'such'chu'te as indicatedby the double heade'd arrow in Figure 4. The

eccentrics'that produce this vibratory motion arerprefen ably 'arran ed to produce a forward stroke of the chute which is in a direction from its low to its high end in a continuous relatively fast uniform rate of movement by which the rocks will be carried -alon g-with-thechute. The i .return movement in the oppositedirection is however executed very rapidly so that the'c hute virtually slides under the rocks leavingthem in the advanced position gained during the immediately-preceding vibratory stroke of the chute. T heinertia of the rocks will tend to keep them moving in the directidnfrom 'the'discharge end of the screen to the discharge end of the chute 'and the momentum acquired by the forward stroke of the chute will overcome any tendency of the rocks to move back during the retrograde stroke of the chute or to roll down the inclined hottornwall of the chute.

The rocks go uphill in the-discharge chute attachment by reason of the vibrations. The vibratory movement screen, a vibration motion device connected to the dismay, for; example, be set at 885 revolutions per minute,

in a back and forth motion. The rocks are lifted up the incline chute in order to clear and convey the rocks over the eccentric drive of a Symon vibrating screen,

and the rocks are also lifted for the purpose of discharging the gravel from the level of the Symon screen to "a higher level, being the conveyor -11. v

, .Below the-screen 14 the bottom of the discharge chute attachment is solid. To this solid bottom 15 is welded or spot welded the mesh screen cloth 14, for example of one-inch mesh. This mesh screen is used because it gives the necessary uplift or grip momentarily to the gravel or rock resulting in the same going up grade. The mesh screen is one type of roughened or uneven surface for the chute which will give the necessary grip.

The vibration of the Symon screen takes 'place by 'virtueof an electric motor attached to the eccentric shaft. Both the Symon screen and the discharge chute of this invention vibrate back and forth at the same rate of speed. As a result of this vibration and 'motion, rocks bounce along up grade across the screen and up the chute over the eccentric drive in and onto the higher level where the rock is taken to another part of the processing plant.

Although I have disclosed herein the best form of the invention known to me at this time, I reserve the right 4 to all such modifications and changes as may come within the scope of the following claims.

What is claimed is: 1. For use with a vibratory screen having a discharge end with a vibratory motion, device adjacent such discharge end and a brace'at the discharge end portion of the screen, a chute comprising an inclined bottom for rising over the device, means at the lower end of the' bottom for attaching the same 'to the discharge end of the screen, side walls erected on the bottom having outturned wings at their lower ends for receiving material from the screen and directingth'esam'e to -thec'hute, straps affixed to the side walls of the chute and having portions shaped to engage the screen brace, and an apron extending downwardly from the high discharge end of the 1 chute.

2. For use with a vibratory screen for-receiving fines and coarserjmaterials in which the fines are adapted to pass through the'rne'shes of the screen. and the coarser material rejected and held supported on the vibratory charge end of the-screen, a sc'reen'brace at the discharge end portion 'of the s'c'ree'n and a segregation conveyor having its receiving 'end arranged on the opposite side of the device from "the screen, a chute adapted to span the distance between the discharge end of the screen and the receiving endof the conveyor and to elevate the coarser material over the vibration motion device, said chute comprising an imperforate bottom of narrower Width than theconveyor, a coarse screen mesh attached over'the imper forate bottom, sidejwalls erected at opposite sides'of the bottom 'andhaving outturned Wings at their lower ends overlying a portionof the discharge end of the screen to deflect the coarser. material into the chute, fastening means at the lower end of the bottom.

and through the wings adapted to attach the chute to the screen, "straps afiixed to the side walls at the higher portions thereof and extending over said wings and adapted to overli'e'the idischa'rge end of the-screen, said straps having hooks atthei'r free end portions adaptedto engage with said screen brace, anda downwardly inclined apron aflixed to the higher discharge end of the chute-and overlying the r'ec'eiving'end of the conveyor References Cited in the fileof this patent UNITED STATES PATENTS