US2311814A - Agitating mechanism - Google Patents

Description

Feb; 23, 1943. G. w, BEHNKE ETAL 2,311,814

.AGITATING 'MECHANISM Filed Junev 7, 1940 2 sheets-sheet 1 Feb. 23, 943. Q w, BEHNKE ETAL Y12,31L8l1- AGITATING MECHANISM Filed June '7, 1940 2 Sheets-Sheet 2 Patented Feb. 23, 1943 AGITATING MECHANISM George W. Behnke, Russell G. Westcott, and John Sandula, Durand, Mich., assignors to Simplicity Engineering Company, Durand, Mich., a corporation of Michigan Application June 7, 1940, serial No. 339,370

3 Claims.

This invention relates to agitating mechanism for use with screening and conveying machines having an eccentric gyratory action, as well as so-called vibrating machines provided with an eccentric out-of-balance action.

One of the prime objects of the invention is to provide a very simple, practical, and economical machine for intensifying the pulsating action created by the gyratory throw, such as is customary in screening and conveying equipment of this nature.

Another object is to provide means for uniformly conveying the material, simultaneously with the intensifying of the pulsating action.

A further object is to provide a mechanism Which eliminates so-called blind areas or spots in the screens and which jars the screen to` stratify the material, that is, to force and throw the coarser particles away from the surface of the screen to avoid any blocking of the screen meshes, so that the liner particles readily work their way downwardly and through the screen.

A further object still is to design a vibrating f mechanism which can be applied to screening and conveying equipment already in use, as well as to new machines in the process of manufacture.

A still further object is to design a simple and practical vibrating mechanism which can be economically manufactured, readily assembled, and which can be easily mounted in position on the screen or conveyer.

With the above and other objects in view, which will appear as the description proceeds, the invention resides in the novel construction, combination, and arrangement of parts, substantially as hereinafter described, and more particularly defined in the appended claims, it being vunderstood that such changes in the precise embodiment of the herein described invention may be made as come within the scope of the claims.

In the accompanying drawings is illustrated one complete example of the physical embodiment of the present invention constructed to the best mode so far devised for the practical application of the principles thereof.

Fig. 1 is a longitudinal sectional view through a conventional type of gyratory screen equipped with an auxiliary vibrating mechanism designed in accordance with one form of the present invention.

Fig. 2 is a top plan view thereof.

Fig. 3 is a transverse sectional View through a. conventional type of gyratory screen illustratconnection With a conventional type of gyrating screen, and while in the present instance we have shown a screen of conventional design, it will be clearly understood that it is equally applicable to various other types of machines and vibratory screens actuated by eccentrics, overbalanced pulleys, hammers, or other mechanical devices with out departing from the principles. Referring now more particularly to the accompanying drawings, the numeral 8 indicates a base comprising longitudinally disposed beams or channel members 9 which are mounted on a suitable foundation designed to position the fraine at substantially the angle desired.

Bearing members I0 are mounted on these beams 9 in position as shown, and the turned ends lI of an eccentric shaft I2 are journaled in these bearings.

The screen body or live screen frame B of the machine may be of any well known construction,

and in the present instance, we have shown av pair of spaced apart side plates l3-l3 provided with openings I4 adapted to accommodate the flanged ends I5 of a tubular member I6, to which is welded or otherwise secured the ends of the tubular housing I1. Bearing assemblies I8 are mounted in the ends of the tubular shell I6 and the turned ends I9 of the counterbalanced eccentric shaft I2 are journaled in these bearings, the extreme ends Il of said shaft being journaled in the main bearings I0, so that the entire assembly is enclosed in a tight, dustproof shell.

Angles 20 are riveted or otherwise secured to the inner side walls of the side plates I3 and crown bars 2| are secured to said angles as shown, the screen cloth 22 being stretched over said crown bars and is secured in position in any desired manner to provide a tight screening surface.

In the heavy duty type of apparatus to which this invention relates, it is necessary to employ resilient means acting upon the opposite ends of the live screen frame for yieldingly resisting movement thereof out of its normally balanced state and for maintaining it in proper screening position, irrespective of the load distribution and without in any way interfering with the gyratory movement of the live frame, and we therefore provide angular-shaped brackets 23 which are secured to the beams 3.

Similar brackets 24 are secured to the side plates I3 and resilient members 25 are interposed between these brackets to provide a resilient connection, and we do not deem it necessary to describe this in detail, as it forms no part of the present invention.

It is usual practice to set the frame ci the machine at a predetermined angle, and a drive pulley 28 is provided on the one end of the shaft l2 and is then geared to a motor (not shown) or any other suitable source of power and as the material to be screened is fed onto the upper end of the screen deck, the gyrating action will screen the material accordingly.

The vibrating mechanism can be attached or inbuilt in the unit as desired, it is generally indicated at D and comprises an enclosed housing 2l which is provided with spaced apart angular-shaped clips 28 secured thereto, and which are in turn secured to the crown bar 2l by welding or any other means, an opening 29 is provided in the side wall of the housing, and a plug member 30 forms a closure for said opening.

A block or weight 3| is mounted in this housing 21 and spring seats 32 are provided therein, adjusting screws 33 being threaded in the lower wall of the housing, and a spring cup 34 is provided on the end of each screw; springs 35 being interposed between the spring seats and the cups so that the block 3| is resiliently supported, lock nuts 36 being provided on each screw to hold the screws in adjusted position, and a rubber or bre strip 31 is secured to the top of the weight to eliminate noise and metal to metal wear.

When the vibration mechanism is mounted on or hung from the crown bars as clearly shown in Figs. 1 and 3 or" the drawings, we find it practical to use one unit on a screen approximately two feet in width, two on a three foot screen, and three on a four foot screen; and when the unit is attached to the side plates, we iind it desirable to place one unit under each end of each crown bar.

When the device is used for screening, the :action will be perpendicular to the now of the material or deck of the screen, and just at the moment when the screen reaches the maximum high point of its travel, the block or weight is thrown against the top of the housing, thus creating a sudden jar which causes the materials to be thrown clear of the screen cloth and loosen lany coarse particles which might block or hang in the screen openings, thus eliminating any blinding, and in fact, stratifying the material.

The device has been found particularly advantageous and effective when the screen deck is set in a horizontal position. Where previously it was necessary for the discharge end of the screen to be somewhat lower than the feed point, because of the diierence in screenability of the materials to be screened, due to the character, size, shape, and moisture content, it has been found advantageous to vary the intensity of the action created by the device to suit the product being screened, and this is accomplished by means of the adjusting screws 33, so that the spring compression may be increased or decreased accordingly.

When the mechanism is used for conveying, the unit must be placed at an angle varying from 0 to 90 in respect to the ow of material or screen deck surface, the unit being so placed that the impulse is directed toward the discharge end of the screen which tends to increase the rapidity of flow. This makes it possible to convey materials from 0 to 15 pitched toward the feed end of the screen, and we find it advantageous if the surface upon which the material is to be conveyed is constructed with a concave cross section in order that the material remain in contact formation to obtain the best results.

In Fig. 6 of the drawings we have shown a force diagram showing the gyratory movement and the position of the weight or block at equally spaced points in the path of movement of the gyration.

In the present instance, the screen operating mechanism employs an eccentric motion including adjustably mounted spring pressed blocks which are cooperatively related to vary the intensity oi the pulsations as the mechanism is operated, `and when the mechanism is in position as indicated at l, the weight or block will be positoned against the top of the housing 26 and be held in this position by means of the springs 35. When the eccentric motion causes the block to approach position indicated at 2, the effective forces increase in a vertical direction so that the force will be greater than the sum of the inertia of the weight and the spring modulus. thus compressing the spring.

The magnitude of the spring force changes with each position of the eccentric and as the eccentric approaches the position 3, the effective force decreases in a vertical direction to Zero at the position 3, and is then acting in a horizontal direction, thus tending to move the block horizontally in the housing. At position 3 with the effective iorce at Zero in a vertical direction, the spring overcomes the inertia of the block, causing it to strike the top of the housing and create the impulse, then as the eccentric approaches position il, the effective force increases in a vertical direction, and, due to the direction or rotation, causes the block to exert greater pressure against the top of the housing. The force exerted against the top of the housing at position 4 is equal to the sum of the vertical force and the pressure of the spring. This completes the cycle which is continuously repeated as the machine is driven.

What We claim is:

l. In a vibratory screen including a driven vibratory frame including transversely disposed crown bars, a screening medium stretched over said bars, housings rigidly mounted on said bars in predetermined spaced relation, spring cups adjustably mounted in said housing, a weight in each housing, springs interposed between said cups `and said weight and normally forcing the Weight against the upper wall of the housing When the screen is not in operation, a resilient strip on the upper face of the weight, said weight receiving its impetus from the movement of said vibratory frame for obtaining impact of the weight against the upper wall oi the housing on the upward cycle of movement of the screen frame.

2. In a vibrating screen including a gyratory frame including transversely disposed crown bars, a screening medium stretched thereover said bars, closed housings rigidly mounted on said frame in spaced relation, vertically adjustable, spaced spring cups provided in each housing, a Weight mounted in each housing and having spring receiving apertures provided therein, springs mounted in said apertures and spring cups respectively, means for driving said frame, said Weights being actuated by the vibrating motion of the frame for intensifying the pulsating action of said gyratory frame.

3. In a vibrating screen including a driven vibratory frame, a removable screen frame carried by the vibratory frame and including transversely disposed crown bars, a screen stretched thereover, housings rigidly attached to said crown bars in predetermined relation, spaced apart, spring seats in each housing, manually loperable means for vertically adjusting said seats, springs mounted in ysaid seats, a weight mounted on said springs and bearing against .the upper Wall of the housing When the screen is not in operation, a resilient strip mounted on the upper surface of each weight, said weights receiving their impetus from the vibratory action of the vibratory frame and striking directly against the upper Wall of the housing when the machine is in operation.

GEORGE W. BEHNKE. RUSSELL. G. WESII'COTT. JOHN SANDULA.

Images