US267467A - Dust-collector for flour-mills - Google Patents

Description

(No Model.)

J, E. SMITH.

DUST GOLLEGTOR FOR FLOUR MILLS.

No. 267,467. Patented N0v. 1 4 188 Sa'rns Frans DUST-COLLECTOR FOR FLOUR-MILLS.

SPECIFICATION forming part of Letters Patent No. 267,467, dated November 14, 1882.

Application filed April 10, 1882.

To all whom it may concern:

Be it known that I, JOHN B. SMITH, of Rochester, Monroe county,I lewYork,ha\-*e invented an Improved Dust-Collector for Flour-Mills, of which the following is a specification, reference being had to the accompanying drawings.

My improved d List-collector is represented in the accompanyingdrawings, in which Figure 1 is a partial side elevation and a partial central vertical section on the line y y, Fig. 2. Fig. 2 is an end elevation. Fig. 3 is an end view of one of the rotary screens. Fig. 4 is a transverse section through the discharge-valve.

1n the accompanying drawings of my improved dust-collector, A A A represent a series of rotary screens; B, the brushes; 0, the inletspout through which the dust-laden air enters; 1), the discharge-valve, and E E E the exterior casing of the machine.

My improved dust-collector consists of a series of rotating circular screens havinginclined sides, arranged to revolve on a common shaft within a closed chamber which receives the d list-laden air, the arrangement being such that the dust is retained on the exterior surface of the screens, from which it is removed by stationary brushes, while the purified air escapes through the meshes of the screens into their center, and is discharged at one or both of their ends.

The rotary screens consist of inner rings or collars, F, and outer rings, G. The outer rings, G, are supported from the inner rings by the radial arms a a, which are mortised or otherwise secured in or to the inner rings, while the outer rings are screwed or bolted to their extremities. The arms a a are double, or made V- shaped, as shown in the sectional view in Fig. 1, theirinner ends being attached to the two 001- lars F F, with which each of the screens is provided. The collars F F of the whole series of screens are attached together by rods Z) I), which pass lengthwise through them,bcing provided with a head at one end and a thread and nut at the other. Three or more of these rods may be used, according to the judgment of the coustructor or the size of the apparatus. The

rods 1) 0 pass through thimbles c 0, Figs. 1 and 3, by which the two collars F F of each screen are maintained at the proper distance from each other. The rings G G and collars F F are (No model.)

preferably made of wood, on account of lightness, and for convenience of the attachment of the cloth q, with which each section is covered. The rings or collars may, however, be made of light metal, wooden strips being attached to them, to which the cloth may be tacked. Any preferred number of these circular-screens, being bolted together by the rods 1), are supported on the shaft m by the spiders 2'. Rotary motion is imparted to the shaft by means ofabelt running over the pulley L. The shaft revolves in journals at the center of the spiders or crossbars g g, the arms of which extend across the opening in the sides of the casing-E, through which the purified air escapes, their ends being fastened to the casing at the edges of the opening. After the screens have been bolted together and attached to the shaft, I prefer to turn them all up true in a lathe, the sides of the arms ac being trued up at the same time, so that the cloth, when applied, shall fit smoothly over the arms.

When the machine is in operation the screens rotate continuously, and in order to free the cloth from the dust which deposits on the exterior ot' the screens I employ a series of brushes, one of which is shown at B, Fig. The brush B is supported in any convenient way on the cross-bar k-as, for instance, by inserting its stem 25 in an opening in the caps, fastened to the cross-bar. The brush B is provided with bristles i" on its opposite faces, which are inclined toward each other, being arranged parallel with the exterior surface of the screens, so that each brush cleans the opposite sides of the circumferential grooves between each separate screen. As the brushes wear away they may be moved upward, so as to keep the bristles in contact with the cloth of the screen, either by adjusting each separate brush upward by sliding the stem 16 in the cap 8, or by adjusting all the brushes upward at once by raising the bar by inserting wedges below it at a, Fig. 1, in the bottom of the slot in the block I, which is fastened to the inside of the casing E and receives the end of the crossbar. As the dust is removed from the screens by the brushes it falls downward, being guided by the hopper-shaped sides of the casing, to the valve D, by which it is delivered to the discharge-spout o. The valve 1) is driven from the shaft m by the pulleys ff and belt It, being arranged to rotate in a circular chamber formed in the base N of the machine below the center of the hopper. The valve consists of a shaft, a, inserted into the cylindrical valve-body, which is provided with a series of longitudinal grooves,in which the dust is carried around by the rotation of the valve and delivered into the discharge-spout 0.

The screens and the valve may be rotated in either direction, it being, in fact, preferable to reverse the direction of rotation occasionally, when the machine is in operation, by means of a twisted belt or other device, as after the screens have revolved in one direction for a length of time the brushes become slightly bent in that direction, and on reversing the motion their action, in cleaning the cloth, will be found to be very much more effective.

It is obvious that my improved dust-catching balloon may be arranged with its axis vertical instead of horizontal, in which case the brushes would be preferably arranged at an angle to a radius of the balloon, as indicated by the dotted line on {v in Fig. 2, for thepurpose of sweeping offany accumulation of dust upon the screens into the case.

At each end of the balloon a ring of felt or other suitable packing is interposed between the end collar,F, and the casing to prevent the escape of the air at this point.

In the drawingsI have represented the cloth as inclined at an angle with the axis ofthe shaft, the circumferential grooves running around the exterior of the balloon heingv'shapedpvith the point of the V toward the longitudinal axis of the balloon. This is the form of construction which I prefer, as, among other advantages, the brushes, being inclined at an angle with each other corresponding with the angle between the arms a a, may be adjusted to compensate for wear by being moved toward the axis of the balloon. It is obvious, however, that the cloth may be arranged in parallel planes at right angles with the axis of rotation of the balloon, the brushes in this case being made adjustable lengthwise of the axis in any convenient manner.

The operation of my improved dust-collector will be readily understood from the foregoing description and drawings. The balloon and the discharge-valve being set in motion, the dust-laden air from any machine or apparatus in the mill enters the casing through the spout G, and, circulating about the balloon, passes through the cloth forming the sides of the circumferential grooves around it, depositing the dust on the cloth, from which it is removed by the action of the brushes as the balloon rotates, being finally discharged from the ma chine by the valve at the lower part of the apparatus. The air is discharged from the openings at one or both ends of the casing entirely purified from dust.

I claim 1. The combination of a rotating dust-catching balloon, provided with circumferential clothcovered grooves,with stationary brushes arranged to clean the cloth, substantially as and for the purposes set forth.

2. The combination of a rotating dust-catching balloon, provided with circumferential cloth-covered grooves, with the casing E, inletspout (J, and brushes B, adapted to clean the cloth at the sides of the grooves, substantially as described.

3. The combination of arotating dust-catching balloon, provided with circumferential cloth-covered grooves, with the casing E, inletspout O, brushes B, and discharge-valve 1), substantially as described.

4. The combination of the outer and inner rings, F and G, cloth q, thimbles 0, arms a a, and bolts 11, substantially as described.

JOHN B. SMITH.

Witnesses H. G. PHILLIPS, GEO. B. SELDEN.

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