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Filed Feb. 7 ,

1952

J u l y

2 7 ,

1 9 5 4

ERNST-GUENTHER LOESCHE 2 , 6 8 4 , 8 1 3

ROTATING-PLATE AND LEVER~MOUNTED GRINDING-ROLL

M I L L , W I TH

UPW A RDLY -DI REC TI NG

CA RRI ER-AI R

MEAN S ADJAC E N T T H E PL AT E PE R IPH E R Y

2

S h e e t s - S h e e t 1

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J u l y 2 7 ,

1 9 5 4 ERNST-GUENTHER

LOESCHE

2 , 6 8 4 , 3 1 3

R O T AT I N G - PL AT E AND L EV E R~ N O U N T E D G R I N DI N G - R O L L

M I L L ,

WITH UPWARDLY-DIRECTING CARRIER-AIR

MEANS ADJACENT

T H E

PLATE PERIPHERY

F i l e d

F e b .

7 , 1 9 5 2

2

S h e e t s - S h e e t

2

II

vr2221)

1512101

E. C ZLoea Che

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P a t e n t e d J u l y 2 7 , 1 9 5 4

2 , 6 8 4 , 8 1 3

S T A T E S

A T E N T O F F I C E

ROTATING-PLATE AND LEVER- MOUNTED

GRINDING-ROLL ILL, WITH UPWARDLY

DIRECTING

C A R R I E R - A I R

M E A N S ADJA

CENT THE

PLATE

PERIPHERY

E r n s t - G u e n t h e r

L o e s c h e , D u s s e l d o r f , Germany

. A p p l i c a t i o n

F e b r u a r y

1 ,

1 9 5 2 , S e r i a l N o . 2 7 0 , 4 3 4

( C l . 24158

Claims.

1

T h i s i n v e n t i o n

r e l a t e s t o

s p r i n g

c o n t r o l l e d

. r o l l e r m i l l s having a v e r t i c a l a x i s , i n which

on

t h e o u t s i d e o f the grindingplate

t h e r e i s a r

ranged

a bladed

rim

o r

s i m i l a r

d e v i c e imparting

. a

J d e s i r e d

d i re c t i o n t o the current

o f

a i r and

having

an

outer r i n g which

together

with a

ring

provided on t he -

ca s in g

ensures

tightness.

In

s p r i n g . c o n t r o l l e d r o l l e r m i l l s o f t h i s t y p e , the

periphery o f t h e m i l l a t

about

the height o f the

g r i n d i n g

p l a t e .

A n a l r e a d y r e c o g n i z e d

advan

tage

i n

the use

o f

c a r r i e r

a i r

c o n s i s t s in

the

fact

t h a t t h i s a i r produces s i f t i n g o f t h e heavy and

u n d e s i r a b l e

c o n s t i t u e n t s o f

t h e m a t e r i a l

b e i n g

ground from t h e

o t h e r c o n s t i t u e n t s t h e r e o f . In

r e s i l i e n t r o l l e r

m i l l s o f

known

c o n s t r u c t i o n ,

h ow

e v e r , i t

wa s d i ? i c u l t t o

adjust

the

speed

o f the

a i r

s u ? i c i e n t l y a c c u r a t e l y

t o render p o s s i b l e

c l e a r

separation

o f

the

c o n s t i t u e n t s o f

the material

b e i n g

g r o u n d .

T h e invention c o n s i s t s i n a r e s i l i e n t - r o l l e r m i l l

i n which

the current

o f a i r e n t e r s through open

i n g s arranged

somewhat b e l o w

t h e

g r i n d i n g

p l a t e .

This current o f

a i r

i s then guided through spe

c i a l l y shaped channels

under

the gr inding p l a t e

and

then passes through a

bladed

rim provided

on the o u t s i d e o f the

grinding

p l a t e ,

o r through

a s i m i l a r

d e v i c e

imparting

a

desired

d i r e c t i o n

t o

t h e a i r s t r e a m , i n t o t h e space above the g r i n d i n g

t a b l e , and there

takes

with i t the material

which

h a s b e e n

s u ? i c i e n t l y

? n e l y

g r o u n d .

In one p r e f e r r e d embodiment o f

t h e

i n v e n t i o n ,

downwardly

i n c l i n e d discharge pass ages are ar

ranged i n t h e

b a s e

o f

t h e s p r i n g

c o n t r o l l e d

r o l l e r

m i l l ,

a nd

the

channels disposed

under the

grind- .

i n g

t a b l e s l o p e

downwards

towards

t h e s e

d i s

charge

p a s s a g e s .

Thus,

u n d e s i r e d

c o n s t i t u e n t s

such

a s

p i e c e s

o f

i r o n and

the l i k e ,

which

because

o f t h e i r high s p e c i ? c

g r a v i t y

cannot be

c a r r i e d

away

by the

c a r r i e r a i r ,

can

c o l l e c t i n the d i s

charge

passages

and be

emptied

out from time t o

t i m e .

O n e

embodiment

o f

the i n v e n t i o n i s

i l l u s t r a t e d

by

way

o f example i n t h e

accompanying

draw

i n g s , i n which:

Figure

1

i s

a

view

of

a

r o l l e r

m i l l in

s e c t i o n ,

c e r t a i n p a r t s b e i n g

shown

i n e l e v a t i o n ,

Figure

2

i s a plan v i e w , i n

s e c t i o n

on s e c t i o n

p l a n e 22 o f F i g u r e

1 ,

Figure 3 i s a s i d e v i e w , i n e l e v a t i o n , o f

the

r e s i l i e n t r o l l e r m i l l i l l u s t r a t e d in s e c t i o n i n

Fig

ure

1 ,

and

Figure

4 i s a view in e l e v a t i o n , on a larger

s c a l e ,

corresponding

t o

a p o r t i o n o f Figure

l ,

c e r t a i n

p a r t s b e i n g shown

i n

s e c t i o n .

C i r

: en t r y o f the c a r r i e r air

took

place along the

20

2

The

main components o f t h e s p r i n g c o n t r o l l e d

r o l l e r m i l l

i l l u s t r a t e d

i n

Figure

1

c o n s i s t

o f a

b a s e n , which

i n

the embodiment

i l l u s t r a t e d

con

s i s t s o f

c o n c r e t e ,

b u t may

l t e r n a t i v e l y

be

made

of

s t e e l , a transmission mechanism 9 accommo

dated i n the

b a s e ,

an

a i r i n l e t

0 , a grinding p l a t e

0

driven

by mean s o f

the

transmission mechanism

d i s p o s e d

underneath i t ,

and

two g r i n d i n g

r o l l e r s

p

whichroll

on

the rotating grinding

p l a t e 1 1

and

a r e l p i v o t a l l y

mount ed on shafts 7

through

t h e

i n t e r m e d i a r y o f o s c i l l a t i n g l e v e r s s a nd

r e s i l

i e n t l y

p r e s s e d a g a i n s t

t h e g r i n d i n g p l a t e ( 2 by

means of a

spring

' .

As

mentioned a b o v e ,

t h e e n t r y

o f

t h e

c a r r i e r

a i r t a k e s

p l a c e

through openings 0

d i s p o s e d on

two o p p o s i t e s i d e s

o f the s p r i n g

c o n t r o l l e d r o l l e r

m i l l , a s s h o w n i n Figures 1 and 3 . The i n l e t

openings 0 lead i n t o channels m isposed below

t h e g r i n d i n g p l a t e ( 1 .

Figure

2 shows t h a t t h e s e

channels

m

l o p e

downwards

towards

d i s c h a r g e

passages

i , two o f which are disposed

on

each

s i d e o f t h e s p r i n g

c o n t r o l l e d

r o l l e r m i l l ( s e e F i g

ure 2 ) .

T h ese

discharge

passages

are each pro

v i d e d ,

a t

the o u t l e t , with a

f l a p

2 ; attached

in a

f r e e l y

r o t a t a b l e

manner a t

i t s

upper

end o n l y ,

whereby when fragments accumulate t h e s e f l a p s

open

spontaneously and therefore have

a s e l f

c l e a r i n g

a c t i o n .

On

h e p e r i p h e r y

o f

t h e g r i n d

ing

p l a t e are

arranged

b l a d e s

0

( s e e Figure

4 ) .

On the

o u t e r

edge o f

t h e s e b l a d e s

0

i s

disposed

a continuous

r i n g

D

which

p r o j e c t s

above the top

edge o f the blades 0 and

together

with a ring 1

d i s p o s e d on

t h e

c a s i n g produces t i g h t n e s s by

reason

o f

the f a c t that the

r i n g

1

o v e r l a p s

on

the i n s i d e

o f the r i n g 2 7 . T h e

casing a

i s r e i n

f o r c e d

a t t h i s

p o i n t

by

t h e arrangement

o f

a

p l u r a l i t y

o f

p l a t e s . The

r i n g

1

i s

adapted

t o

t h e

d e s i r e d course

o f the

current

o f

a i r

and

i s made

o f

w e a r - r e s i s t a n t

m a t e r i a l , f o r

i n s t a n c e

c a s t e l e c

t r i c

s t e e l .

On the o u t e r edge

o f

the grinding

p l a t e 0 3 i s provided a further

r i n g

i t

which

s used

f o r r e t a i n i n g t h e m a t e r i a l being ground and i s

formed a s a bulge corresponding

t o

the

d e s i r e d

course o f the

current

o f

a i r , and i s a l s o made f

a

wear-resistant material. By

means

of screws

t h i s

r i n g

i t

i s

arranged

s o

a s

t o

be

v e r t i c a l l y

ad

j u s t a b l e , p r e f e r a b l y by

t h e

i n s e r t i o n o f make-up

p i e c e s k . T h e arrow

in

Figure

4 shows

the r e

quired d i r e c t i o n

o f

?ow

o f

the c a r r i e r a i r .

The

g r i n d i n g p l a t e

( 1 i s p r o v i d e d with s p e c i a l l y

w e a r - r e s i s t a n t p a r t s q ?xed t o t h e g r i n d i n g p l a t e

a t

by

means

o f clamping me m be r s t . I n the

centre o f the grinding p l a t e a truncated-conical

e l e v a t i o n t o i s provided i n order t o prevent the

accumulation o f m a t e r i a l t h e r e .

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3

T he arrangement

o f

t h e g r i n d i n g r o l l e r s p i s

as follows:

The g r i n d i n g r o l l e r s a r e each arranged between

a pair

o f o s c i l l a t in g l e v e r s

s

( s e e

Figure

3 ) .

R e s i l i e n t

p r e s s u r e

o f the

g r i n d i n g

r o l l e r s

p

a g a i n s t

the grinding p l a t e ( 1 i s e?ected

by a

p a i r o f

s p r i n g s r

d i s p o s e d

l a t e r a l l y o f the m i l l c a s i n g .

A l t e r n a t i v e l y however

i t i s p o s s i b l e t o

p r o v i d e

for instance

one

spring which in tha t case

w i l l

pass

through

the m i l l casing i t s e l f .

I claim:

1 .

A p r i n g c o n t r o l l e d r o l l e r m i l l f o r

g r i n d i n g

c o a l , l i m e s t o n e and l i k e

m a t e r i a l s ,

c o m p r i s i n g :

a

casing

having

l a t e r a l

a i r i n l e t s t h e r e i n , a

grind

i n g p l a t e mounted f o r r o t a t i o n about a v e r t i c a l

a x i s

w i t h i n

s a i d

c a s i n g , s a i d

g r i n d i n g

p l a t e

hav

i n g a ?at grinding

surface

l o c a t e d above s a i d a i r

i n l e t s ,

g r i n d i n g

r o l l e r s , l e v e r s

c a r r y i n g

s a i d g r i n d

i n g

r o l l e r s and mounted

o

swing about

h o r i z o n t a l

axes

t o l o c a t e s a i d

r o l l e r s

on s a i d

f l a t grinding

s u r f a c e i n r o l l i n g

c o n t a c t

t h e r e w i t h , s p r i n g

means

a p p l i e d

t o

s a i d

l e v e r s t o

p r e s s

the

grinding

r o l l e r s

a g a i n s t t h e g r i n d i n g s u r f a c e

f o r

g r i n d i n g

the

ma

t e r i a l d u r i n g t h e

r o t a t i o n o f

t h e g r i n d i n g p l a t e ,

a

p e r i p h e r a l

r e t a i n i n g r i n g on the g r i n d i n g p l a t e

p r o j e c t i n g above t h e

g r i n d i n g

s u r f a c e t h e r e o f , a i r

c o n d u i t s i n s a i d c a s i n g f o r

conducting a i r

from

s a i d a i r i n l e t s t o the underside o f the grinding

p l a t e , s a i d

a i r

c o n d u i t s having downwardly and

o u t w a r d l y i n c l i n e d bottom

w a l l s , p e r i p h e r a l

b l a d e s

on the o u t s i d e o f s a i d g r i n d i n g

p l a t e ,

10

15

20

25

3 0

4

arranged t o convey a i r upwardly

from

s a i d a i r

c o n d u i t s t o t h e

upper

s i d e

o f

the grinding

p l a t e ,

a

continuous

shroud r i n g on the outer edges o f

s a i d

b l a d e s ,

s a i d

shroud

r i n g p r o j e c t i n g above

the

top

edges o f the b l a d e s , a r i n g

on

the i n s i d e o f the

c a s i n g

above

s a i d b l a d e s and overlapping the

p r o j e c t i n g

part

o f the shroud r i n g ,

and a base

under s a i d c a s i n g having

i n c l i n e d

d i s c h a r g e

pas

sages t herein below said

a i r

i n l e t s

for the

d i s

charge o f undesired constituents.

2 . A

pring

controlled r o l l e r

m i l l as

s e t forth i n

c l a i m

1 ,

i n which

t h e

r e t a i n i n g r i n g

and t h e

r i n g

on the i n s i d e o f the

casing

are

adapted

t o co

operate with one another t o guide the

a i r

cur

r e n t d e l i v e r e d by the

b l a d e s

along the d e s i r e d

path i n t o

t h e

space above the g r i n d i n g s u r f a c e .

References

C i t e d i n the ? l e o f t h i s patent

UNITED STATES PATENTS

N u m b e r

Name

D a te

1,473,478 Kreutzberg

_______

__

Dec. 25,

1923

2,112,359 Crites ___________ _ Mar. 29, 193 8

2,206,145

Wood

____________

__

July

2 ,

1940

2,342,255 Doyle ____________ __

Feb.

22,

194 4

2,378,681

Bailey ___________

__

June 19, 1945

FOREIGN

PATENTS

N u m be r Country

Date

428,237 Great Brita in ______

__ ay , 1935