US288808A - Feed meohafism foe eollee mills - Google Patents

Description

I 2 Sheets-Sheet 1.

N. W. HOLT.

FEED MECHANISM FQR ROLLER MILLS. No. 288,808.

(No Modei.)

Patented Nov. 20

jaw/2x 02:

TL PETERS. PM Lilhngnpher, Wazhmgicn, D. C.

2 Sheets-She'et 2'.

(No Model.)

'N. w. HOLT.

FEED MEGH A EISM ROLLER MILLS. No. 288,808. Patented Nov. 20, 1883;

,Zuzeniar.

Wave 556,5: I

' I jiivney N. PETERS. mnuuwm mr. Wnhinnlm. D. c.

UNITED STATES ATENT Fries.

NOAH W. HOLT, OF BUFFALO, NEW/V YORK.

FEED MECHANISM FOR ROLLER-MILLS.

SPECIFICATION forming part of Letters Patent No. 288,808, dated November 20, 1883,

Application filed July 17, 1883. (No model.)

To all whom it may concern:

Be it known that I, can Vi. HOLT, of the city of Buffalo, in the county of Erie and State of New York, have invented new and useful Improvements in Feed Mechanism for Roller--Mills, of which the following is a specification.

This invention relates to an improvement in the construction of the mechanism whereby the material is fed between the grinding or crushing rollers. Heretofore revolving feedrollers have been most generally employed in roller-mills for feeding the material to the rollers; but it is found in practice that when the material is of an adhesive or fuzzy character the feed-rollers fail to feed the material uniformly over the entire length of the crushingrollers, whereby the operation of crushing or grinding is rendered irregular, and more or less unsatisfactory.

The object of my invention is to construct a feed mechanism which will distribute the material over the entire length of the crushingrollers; and my invention consists of the improvements in the construction of the feed mechanism, which will be hereinafter fully set forth, and pointed out in the claims.

In the accompanying drawings, Figure 1 is a vertical section of a double-roller mill provided with my improved feed device. Fig. 2 is a horizontal section in linear, Fig. 1. Fig. 3 is a vertical section in line 3 3 Fig. 1. Fig. 4 is a side elevation, partly in section, of my improved feed mechanism on an enlarged scale.

Like letters of reference refer to like parts in the several figures.

A A represent two pairs of crushing or grinding rollers, arranged in a casing, B, and supported in bearings b, secured to a stationary frame, B, in a well'known manner.

0 0 represent the feed-hoppers, of ordinary construction, arranged above the rollers A A, and divided by a partition, 0, which terminates at its lower end in two downwardly-diverging inclined boards, 0.

D represents the outer inclined walls of the feed-hoppers, and E the feed-gates, arranged at the lower ends of the outer walls, D, for

regulating the escape of the material from the feed-hoppers. The feed-gates E are automatiof the feed-hoppers.

in the feed-hoppers, and connected with the feed-gates by rods f, which are attached to the feed-gates and rest against arms 6 projecting rearwardly from the feed-gates. The latter are provided with arms 6 which are provided with pivots extending through the side walls 6 are arms secured to the outer ends of these pivots, and e are springs which are secured to the outer side of the feed-hoppers in such manner that they are compressed or strained by the opening movement of the feed-gates. These springs are provided with adjusting-nuts, whereby their tension can be regulated. The pressure of the material in the feed-hopper upon the hinged board e tends to open the feed-gate, and this movement is resisted by the spring,

so that the opening of the feed-gate is proportionate to the quantity of material contained in the feed-hopper.

F represents a movable board or plate arranged below the discharge-openings of the feed-hoppers 0, immediately underneath the lower ends of the inclined walls 0 and the feedgates E, so that the material passes from the discharge-openings of the feed-hoppers directly upon the plate F, and is to a certain extent supported by the latter. 9 are agitatingpins secured to the upper side of the plate F, and projecting upwardly into the dischargeopenings of the feed-hoppers for stirring and disintegrating the material in thethroats of the hoppers. The outer edges of the plate F are beveled or inclined,as shown at h, and connected with sieves H, which extend outwardly beyond the outer roller of each pair of grinding-rollers. The meshes of the sieves H are made so coarse that they will permit all material which is to be reduced to pass through the sieves and between the rollers; and will only carry beyond the rollers nails and other hard and large substances which may accidentally become mixed with the material as it is conveyed from one machine to another in the mill. ,The plate F and sieves H are attachedtoa fram e, I, which is supported by spring bars or links 1', secured with their lower ends to the'inner sides of the casing B. The frame Ircceives a reciprocating motion parallel with the longitudinal axes of the rollers by an eccentric, j, which is mountedupon acountcr-shaft, j, and

IOO

connected with the frame I by a rod, K. The shaft jis supported in bearings L, and rotated from one of the roller-shafts by an endless belt, m, running around a pulley, M, on the shaft j.

The plate F is provided on its upper side with ribs n, arranged on the inner sides of the inclined walls a, to prevent the material from flowing backwardly on the plate F. The material contained in the throats of the feed-hoppers O rests upon the plate F, and is constantly agitated and disintegrated by the vibratory motion of the agitating-pins g, and evenly distributed over the entire width of the plate F,

underneath the discharge-openings of the feedhoppers. The material is further distributed as it passes over the edges h of the plate F and the sieves H, so that the feed is rendered uni-- form over the entire length of the rollers, and the clogging or accumulation of material upon any part of the feed mechanism is entirely prevented. WVhen only one pair of rollers is employed in the reduction-machine, the platecharge-opening of the feed-hopper to receive the material therefrom, agitating-pins secured to said board or plate and projecting into the throat of the feed-hopper, mechanism whereby a shaking motion is imparted to said board or plate, and a-feedgate adjustable toward and from said board or plate, substantially as setforth.

2. The combination,with the grinding mechanism, of a feed-hopper, a board or plate arranged below the discharge-opening of the feed-hopper to-receive the material therefrom, agitating-pins secured to said board or plate and projecting into the throat of the feed-hopper, mechanism whereby a shaking motion is imparted to said board or plate, and a screen attached to said board or plate and adapted to exclude the coarse material from the grinding mechanism, substantially as set forth.

3. The combination, with the feed-hopper, of a board or plate arranged below the discharge-opening of the feed-hopper to receive the material therefrom, agitating-pins secured to said board or plate and projecting into the throat of' the feed-hopper, mechanism where by ashaking motion is imparted to said board or plate, and feed-gate capable of automatic adjustment toward and from said board or plate, substantially as set forth.

. NOAH W. HOLT.

W'itnesses:

JNo. J BONNER, CHAS.- J. BUCHHEIT.

Images