US1721821A - Pulverizing machine - Google Patents

Description

y 3,1929. I R 5. KNITTEL 31 PULVERIZING MACHINE Filed May 18, 1927 55 reference numerals refer to like parts where- The form-of grinding sector as shown UNITED sTA'r s ram. s. xnrrrnn-or mess our, nnw'innsny.

PULVEBIZING MACHINE.

' Application filed May 18 Thisinvention relates to the pulverizing machines illustrated in the Roebbel Patent 1,015,344, dated Jan. 23, 1912 and my own Patent 1,424,922, dated Aug. 8, 1322 wherein a series of rings and hammers are rotatably mounted within the casing.

In a pulverizer of these types the grinding rings are loosely mounted on their supporting rods their diameterdepending on the size of: the machine. As this size .is very limited, the actual grinding surface in contact with the stationary grinding concaves in the machine is also very limited corresponding to the diameter of the rings. Therefore, with ring sectors as described hereinafter having a surface arcuated by a radius equal to the diameter of the ring suspended from the same point as in the above mentioned patents, the

' contact between the triangle grinding members and the grinding concaves is increased proportionately. Inpulverizers as described. in the above patents, it is found that the rings 7 are worn one-sided and remaining in one position'during the grinding operation so that 2 the worn side only acts as grinding surface, the part of the ring still containing the original dimension not coming in contact with the material to' be ground. Extremecases have shown that one side of the ring can be ground completely away where the other parts of the ring remain nearly their origina dimension.

The triangle after described will force the least worn and V 88 heaviest grinding surface against the grind= ing concaves on account of the centrifugal and gravity action. The gravity action taking place at the startingand stopping of the machine. or. when the grinding member is lifted off the point of suspension on account of striking foreign parts contained in the mater-ial to be ground. This centrifugal action is the action of the machine proper when rung 4 The principal'object of the present invention is to producea grinding member which will give a more economical grinding surface and prevent acne-sided. wearof the grinding members. .Other objects are an increase of the wearing surface in proportion to the weight of the grinding member'. It further. consists in the arrangement and combinations".

herein described and claimed.

In the accompanying drawing wherein like ever they occur,

J grinding members as here1n- 1927. Serial No. 192,307.

forms of grindingsurface's possible and re-- quired for different purposes.

Referring to Fig. ,1 of the accompanying no 1 I drawing, my .invention is illustrated in connectionwith a'pulverizer' comprising an upper casing 5 and a lower casing 6 having removable sections 7 for clamping them together.

The main shaft 8 is mounted in bearings formed in the end walls of the lower casing. Each end wall of the lower casing is provided with a flange 9 which supports the ends of the grinding concave 10 and the grate bars 11. The end walls of the lower casing are 1 secured together by means of rods 12-locate'd cave and the grate bars. Mounted on the shaft 8, in the recess formed in the inner face of the end walls of the'casing, are end plates inside" the casing below the grinding .con-

,or disks 13. These disks are keyed to the shaft 8 so as tobe rigid-therewith and are connected to each other near the outer edge by a series of "spaced parallel rods 14. Arranged on the series of rods 14 are grinding sectors 15 and shredding or cutting sectors 16. Mounted on the shaft Sbetween the disks 13 are" spiders 17, whose radially extendingarms 18 are perforated to receive the supporting rods 14, thereby forming supports for said rods intermediate their-ends. The radially extending arms 18 of the spiders 17 serve to space the grinding sectors 15 and the shredding sectors 16' which are arranged in alternation on the supporting arms, Thls same arrangement .of spacing is carried out in the angular spacing of the grinding sectors other, thereby spacing the arms of the spiders the desired distance from each other.

According to the requirements of the masmooth surfaces Fig. 3, wedge formed sur faces Fig. 4. hammer formed surfaces Fig.5

chine, the sectors may be equipped withand the shredding sectors on the supportinggE-Z rods 14. The hub portions of the spiders are keyed to the shaft 8 and abut against each of any grinding ring possible in the same size.

machine. In addition to" trianglilarly formed grinding sectors, forms with more suspension points can be used, but I found that the-triangular form will give thellarg'est grinding surface. A grindingsectorwith two suspension points is not advisable as the'sa'me will hot readily yield when foreign inaterial'should be contained in the machine.

In the operation of themachine, it is found that the grinding sector will lean back so that the front point of each iar'cuated part will do the actual work'ythe' rearl part will be lifted away .from .the ,'grinding concaves and therefore preserved. It, therefore, is possible to turn the grinding sectors end for end so that the point being before the rear part will now workas front part and give a new sharp grinding surface. 1 The change from one arcuated surface to the other will take place whenthe .wear is sufficient to give the difference in the gravity action which takes place when starting -or stopping the machine or when -'for'eign materialis'contained in the machine. -In starting the 1nachine',=the sectors-will swing on the-suspension point'until the velocity; increases and the sectors are thrown outy-by centrifugal force. Passing over the highest 'part inthe revolving circle; a velocity i's'reached where thegravity action on the sectors is-still'sufii'cient to overcome the centrifugal action of the machine and the sectors will'dropdown so that another arcuate'd face is exposed to the grin-ding concaves 10:

. This is noticeable iriithe machines by the sound of the falling sectors. 1

When foreign materialfstrikes the sector,

the same ,is lifted ofiflthe suspension point. The forward movement ofzthe machine brings the suspension point of shaft 14 to aposition so that-the other suspension point in the "grinding sectbr is' caught by the shaft 14 and anothergr nding surface is exposed to the grinding concaves 10.

t; From 'thevforegoing description, it will be.

fshaft is used instead of the original large size' shaft 14, allowing the grinding sector to approach again, the grinding concave 10, to the original distance.

The foregoing arrangement is considered only-as an example; and I'cdonot wish'to be limited to the t'ype'of machineshown as my crushing and grinding member is'equally as well applicable to other types of'pulverizers.

What is claimed'is: o

Ascrush-ing and grinding member for pulvcrizing inachinescomprisinga substantially triangular annular body for suspension from the inner angles thereof,"the sectionsiof said.

body between its apices being of equal-mass and'of the'same *formfand each of said sections having anjexteriol" grinding surface extending betweenspaced'apideson an arc whose center lies'substantially in the'opposite inner angle of-the t'riangular body, said grinding surfacesibe'ing connected with each other" at theapices of said faces. F PAUL S. KNITTEL.

member by convex'sur-

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