CA1163485A - Pulp pit for a grinder - Google Patents
Pulp pit for a grinderInfo
- Publication number
- CA1163485A CA1163485A CA000353459A CA353459A CA1163485A CA 1163485 A CA1163485 A CA 1163485A CA 000353459 A CA000353459 A CA 000353459A CA 353459 A CA353459 A CA 353459A CA 1163485 A CA1163485 A CA 1163485A
- Authority
- CA
- Canada
- Prior art keywords
- pit
- grinding
- grinder body
- pulp
- grinder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
- D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
- D21B1/14—Disintegrating in mills
- D21B1/18—Disintegrating in mills in magazine-type machines
- D21B1/24—Disintegrating in mills in magazine-type machines of the pocket type
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Mechanical Engineering (AREA)
- Paper (AREA)
- Crushing And Grinding (AREA)
- Grinding Of Cylindrical And Plane Surfaces (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
An apparatus for grinding wood into pulp which is conveyed as a suspension through processing equipment and which includes a rotatable grinding member, a grinder body partially defining a grinding chamber in which said grinding member is mounted to rotate and which includes an opening below said grinding member through which wood pulp can fall, and a pit located below said opening and positioned to receive wood pulp falling therein. The pit is secured to the grinder body in pressure-tight fashion to complete the grinding chamber and includes discharge means defining an outlet for continuously discharging a pulp suspension therefrom. The pit is supported completely from the grinder body independently of any foundational support.
An apparatus for grinding wood into pulp which is conveyed as a suspension through processing equipment and which includes a rotatable grinding member, a grinder body partially defining a grinding chamber in which said grinding member is mounted to rotate and which includes an opening below said grinding member through which wood pulp can fall, and a pit located below said opening and positioned to receive wood pulp falling therein. The pit is secured to the grinder body in pressure-tight fashion to complete the grinding chamber and includes discharge means defining an outlet for continuously discharging a pulp suspension therefrom. The pit is supported completely from the grinder body independently of any foundational support.
Description
The present invention relates to apparatus for grinding wood into pulp.
In conventional wood grinding apparatus, the wood is ground by a grinding stone in an aqueous suspension, the consistency of which is about 0.8 to 5%, and the suspension falls into a pit below the stone. From this pit the sus-pension flows by its own weight, usually over a dam, to further processing such as screening. By means of the dam, the suspension level below the grinding wheel is set high enough so that the lower part of the grln~ding stone extends
In conventional wood grinding apparatus, the wood is ground by a grinding stone in an aqueous suspension, the consistency of which is about 0.8 to 5%, and the suspension falls into a pit below the stone. From this pit the sus-pension flows by its own weight, usually over a dam, to further processing such as screening. By means of the dam, the suspension level below the grinding wheel is set high enough so that the lower part of the grln~ding stone extends
2 to 10 cm below the suspension level. Thus, the grinding _ wheel is cooled, lubricated and cl~eaned by the suspension.
Conventionally, the suspension pit for pocket grinders has been merely a concrete pit 1n the~oundation 15~ of the grinder and the floor. To insure proper~s~ealing~
:: ` ~ : :
and to prevent corrosion, the pit has~usually been llned either with ceramic tiles~or stainless steel plates~having a thickness of 2 to 4 mm.
It has also been found that the fiber propertles are markedly improved if the wood is ground~by means of a pressure grlnder wherein the pressure ln the grinding chamber exceeds atmospheric pressure. Such~pressure ~
grinders provide additional problems in that~the foundation rèquires a considerably greater amount of reinforcement, because the elevated pressure tends to~lift the grlnder itself upwardly from the foundation and subjects it to :: `
'~
: :
1~34~S
a stress which is difficult to overcome.
This invention has for its object to provide an apparatus for grinding wood into pulp having a new type of suspension pit in which the underlying foundation is not subjected to sobstantial stresses.
According to the present invention there is pro-vided an apparatus for grinding wood into pulp which includes a rotatable grinding member, a grinder~body partially definlng a grinding chamber in which sald grinding 10 member is mounted to rotate and which includes~an~openlng ;, below said ~rinding member through which wood puIp can fall, and a pit located below said openlng and~posltloned to receive wood pulp falling therein. The pit is secured to the grinder body in pressure-tight~fashion to complete : : :
15 the grinder chamber~and includes discharge~means defining ;~
an outlet for contlnuously dlsc~harglng a pulp suspenslon~
therefrom. The pit is supported completely~from the~grinder body independently of àny foundational support, ~
The present invention is partlcularly;appllcable to a pressurized grinder in whlch the wood is gr~oond by .
a rotating grinding member in a grinding chamber which~is~
filled with pressurized gas and whlch is partlally defined by the pit. In thls smbo~dlmsnt the plt should~have a con-struction which is strong~enough to withstand the slevated pressure in the grlndlng chamber and the weigh~t of the suspension . : ~ : ~
' : ,~
:: ', ' . .
.
~ ~t;348S
The pit of the apparatus provided by the present invention is self-supporting in that it is not supported by any underlying foundation. The support for the pit comes completely from the grinder itself. In a preferred form of the invention, the upper edge of the pit has a continuous peripheral flange by means of which the pit can be fastened to the body of ihe grinder.~ Accordlngly, the pit is not supported by the grlnder foundation but lS
fastened tightly to the grinder itself and is supported thereby. The concrete foundati~on of~the grinder therefore is not subjected to any additional forces caused~by increased pressure. Such forces can be very large, .
inasmuch as an added pressure~of one~bar causes a force of 10,000 kp per square~meter~
The self-support1ng grinder pit~according~to the : : : ~ :: : : ; ` :
present invention lS applicable to both traditional~and~
pressure grinders. It is compatible with existing installa~
tions, particularly in that the~conventional~ov~rflow~dam `, :: : ::
can be used for adjusting the suspenslon level in the grinder.
In or~der that the invention~ may be more clearly understood, reference will now be~made to the accompanying drawings which illustrate a number of preferred embod~
ments of the inventlon by way of e~xample, and in which:
Fig. 1 is a perspective view of a self-supporting ' :
- ~:
.
, ~
Conventionally, the suspension pit for pocket grinders has been merely a concrete pit 1n the~oundation 15~ of the grinder and the floor. To insure proper~s~ealing~
:: ` ~ : :
and to prevent corrosion, the pit has~usually been llned either with ceramic tiles~or stainless steel plates~having a thickness of 2 to 4 mm.
It has also been found that the fiber propertles are markedly improved if the wood is ground~by means of a pressure grlnder wherein the pressure ln the grinding chamber exceeds atmospheric pressure. Such~pressure ~
grinders provide additional problems in that~the foundation rèquires a considerably greater amount of reinforcement, because the elevated pressure tends to~lift the grlnder itself upwardly from the foundation and subjects it to :: `
'~
: :
1~34~S
a stress which is difficult to overcome.
This invention has for its object to provide an apparatus for grinding wood into pulp having a new type of suspension pit in which the underlying foundation is not subjected to sobstantial stresses.
According to the present invention there is pro-vided an apparatus for grinding wood into pulp which includes a rotatable grinding member, a grinder~body partially definlng a grinding chamber in which sald grinding 10 member is mounted to rotate and which includes~an~openlng ;, below said ~rinding member through which wood puIp can fall, and a pit located below said openlng and~posltloned to receive wood pulp falling therein. The pit is secured to the grinder body in pressure-tight~fashion to complete : : :
15 the grinder chamber~and includes discharge~means defining ;~
an outlet for contlnuously dlsc~harglng a pulp suspenslon~
therefrom. The pit is supported completely~from the~grinder body independently of àny foundational support, ~
The present invention is partlcularly;appllcable to a pressurized grinder in whlch the wood is gr~oond by .
a rotating grinding member in a grinding chamber which~is~
filled with pressurized gas and whlch is partlally defined by the pit. In thls smbo~dlmsnt the plt should~have a con-struction which is strong~enough to withstand the slevated pressure in the grlndlng chamber and the weigh~t of the suspension . : ~ : ~
' : ,~
:: ', ' . .
.
~ ~t;348S
The pit of the apparatus provided by the present invention is self-supporting in that it is not supported by any underlying foundation. The support for the pit comes completely from the grinder itself. In a preferred form of the invention, the upper edge of the pit has a continuous peripheral flange by means of which the pit can be fastened to the body of ihe grinder.~ Accordlngly, the pit is not supported by the grlnder foundation but lS
fastened tightly to the grinder itself and is supported thereby. The concrete foundati~on of~the grinder therefore is not subjected to any additional forces caused~by increased pressure. Such forces can be very large, .
inasmuch as an added pressure~of one~bar causes a force of 10,000 kp per square~meter~
The self-support1ng grinder pit~according~to the : : : ~ :: : : ; ` :
present invention lS applicable to both traditional~and~
pressure grinders. It is compatible with existing installa~
tions, particularly in that the~conventional~ov~rflow~dam `, :: : ::
can be used for adjusting the suspenslon level in the grinder.
In or~der that the invention~ may be more clearly understood, reference will now be~made to the accompanying drawings which illustrate a number of preferred embod~
ments of the inventlon by way of e~xample, and in which:
Fig. 1 is a perspective view of a self-supporting ' :
- ~:
.
, ~
3~8S;
pit structure which can be used in conjunction with a wood grinding apparatus having a dam t~pe structurei Fig. 2 is a perspective view of a modified form l~
of a self-supporting pit which can be used for a grinder without a dam; and, Fig. 3 is an elevational vlew partly in cross-section of a wood grinding apparatus accordlng to the present invention. ~ ~ ;
~:
Referring first to Fig. 3, the grinding apparatus - shown~therein includes two pressure members;l3;which ;~
press wood in the conventional~manner against a grindin;g stone 3 from both~sides~of the stone. The~wood is ground in an aqueous suspenslon and the suspension falls~lnto a pit 1 which is located directly below the; grlndlng~stone 3. ¦;
Also shown ln Fig. 3 ls~a dam~structure 2 which~adjusts the level of the surface of the~suspension so that the grinding stone 3 lS partly immersed in the suspenslon.
This serves to clean and cool the stone. After the dam, the suspension falls~into the second part of the pit where the suspension level 4 is lower than the dam. From there, the suspension~is led through an outlet pipe 5 to fuxther processing. In the case of a pressure grinding installa-: ~
taion, a second outlet pipe 6 can be used through which the suspenslon lS fed into a separate pressure grinding :
, -, . ~ .
:,~ ` :
:` ',, .
i process.
Referring specifically to Fig~ 1, the pit shown therein includes sidewalls 7 and a base wall 8 which slopes downwardly from beneath the grinding stone to the outlet 5.
The sidewalls and the bottom wall are constructed to wlth-stand the forces to which they are subjected. The pit structure can be fastened to the body of the grlnder by any of a variety of means. To provide for such fastening, a peripheral flange~9 is provided on the pit structure, and co-operates with and is secured to a flanged structure .
10 of the grlnder. As shown the flange 9 has holes - ~ therein to permlt the flange to be secured to the grlnder ~ -~
by means of nuts and bolts.~ ;In any event~ t ls~ important that there be a sealing relationshlp;~between the~ grinder~
:
structure ànd the plt~so~that~the comblnation of the two I
I provldes~a chamber whlch~is~pressure tight. The gr;lnder~
structure ltself~may~be supported ln the conventlonal~
manner from a~foundatlon ll,~leavlng the bottom of the~
pit structure l~ln spaced relatlon to~the foundatlon~fIoor.
Because o`f the ~self-supporting~nature of ~the pit~t~he forces caused by the~increased pressure ln~`the plt are not transferIed~to the foundatlon. Consequently, the~founda~
tion of the grinder can be built on supportlng plllars and the floor ltself can;have~a~relatlvely~llght~con- ;~
struction. ~
~ In Flg 2 there is lllustrated another form~of;
`
, , , the invention for the so-called pitless grinding procedure.
The suspension level is so low that it is not touched by the grinding stone. In this construction, there is no over~low dam and the suspension is led out through outlet pipes 12 from the pit directly to additional processing equipment. This construction is smaller and simpler than the one shown in Fig. 1, and can be more easlly deslgned to withstand excessive pressure. The bottom wall of the structure as shown in Fig. 2 is arcuate, with the outlet pipes 12 being disposed at the lowest po]nt~of the base wall. As in the case of the structure shown in Fig. 1, ~:
- the pit structure is provided with a continuous peripheral flange 9 which is secured to the~grinder~body. ~
It~should be evident that varlous modifioatlons can be made~to the descri~bed embodiments without departing : ~.
from the scope of the~present inventlon.~
:: : ~ : :
::
:: :
- ~ ::
, ~ '
pit structure which can be used in conjunction with a wood grinding apparatus having a dam t~pe structurei Fig. 2 is a perspective view of a modified form l~
of a self-supporting pit which can be used for a grinder without a dam; and, Fig. 3 is an elevational vlew partly in cross-section of a wood grinding apparatus accordlng to the present invention. ~ ~ ;
~:
Referring first to Fig. 3, the grinding apparatus - shown~therein includes two pressure members;l3;which ;~
press wood in the conventional~manner against a grindin;g stone 3 from both~sides~of the stone. The~wood is ground in an aqueous suspenslon and the suspension falls~lnto a pit 1 which is located directly below the; grlndlng~stone 3. ¦;
Also shown ln Fig. 3 ls~a dam~structure 2 which~adjusts the level of the surface of the~suspension so that the grinding stone 3 lS partly immersed in the suspenslon.
This serves to clean and cool the stone. After the dam, the suspension falls~into the second part of the pit where the suspension level 4 is lower than the dam. From there, the suspension~is led through an outlet pipe 5 to fuxther processing. In the case of a pressure grinding installa-: ~
taion, a second outlet pipe 6 can be used through which the suspenslon lS fed into a separate pressure grinding :
, -, . ~ .
:,~ ` :
:` ',, .
i process.
Referring specifically to Fig~ 1, the pit shown therein includes sidewalls 7 and a base wall 8 which slopes downwardly from beneath the grinding stone to the outlet 5.
The sidewalls and the bottom wall are constructed to wlth-stand the forces to which they are subjected. The pit structure can be fastened to the body of the grlnder by any of a variety of means. To provide for such fastening, a peripheral flange~9 is provided on the pit structure, and co-operates with and is secured to a flanged structure .
10 of the grlnder. As shown the flange 9 has holes - ~ therein to permlt the flange to be secured to the grlnder ~ -~
by means of nuts and bolts.~ ;In any event~ t ls~ important that there be a sealing relationshlp;~between the~ grinder~
:
structure ànd the plt~so~that~the comblnation of the two I
I provldes~a chamber whlch~is~pressure tight. The gr;lnder~
structure ltself~may~be supported ln the conventlonal~
manner from a~foundatlon ll,~leavlng the bottom of the~
pit structure l~ln spaced relatlon to~the foundatlon~fIoor.
Because o`f the ~self-supporting~nature of ~the pit~t~he forces caused by the~increased pressure ln~`the plt are not transferIed~to the foundatlon. Consequently, the~founda~
tion of the grinder can be built on supportlng plllars and the floor ltself can;have~a~relatlvely~llght~con- ;~
struction. ~
~ In Flg 2 there is lllustrated another form~of;
`
, , , the invention for the so-called pitless grinding procedure.
The suspension level is so low that it is not touched by the grinding stone. In this construction, there is no over~low dam and the suspension is led out through outlet pipes 12 from the pit directly to additional processing equipment. This construction is smaller and simpler than the one shown in Fig. 1, and can be more easlly deslgned to withstand excessive pressure. The bottom wall of the structure as shown in Fig. 2 is arcuate, with the outlet pipes 12 being disposed at the lowest po]nt~of the base wall. As in the case of the structure shown in Fig. 1, ~:
- the pit structure is provided with a continuous peripheral flange 9 which is secured to the~grinder~body. ~
It~should be evident that varlous modifioatlons can be made~to the descri~bed embodiments without departing : ~.
from the scope of the~present inventlon.~
:: : ~ : :
::
:: :
- ~ ::
, ~ '
Claims (6)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. An apparatus for grinding wood into pulp which includes:
a rotatable, grinding member;
a grinder body partially defining a grinding chamber in which said grinding member is mounted to rotate, and which includes an opening below said grinding member through which wood pulp can fall;
a pit located below said opening and positioned to receive wood pulp falling therein;
securing means securing said pit to said grinder body in pressure-tight fashion, said grinder body and pit together defining said grinding chamber; and, discharge means in said pit defining an outlet for continuously discharging a pulp suspension therefrom;
said pit being supported completely from said grinder body independently of any foundational support.
a rotatable, grinding member;
a grinder body partially defining a grinding chamber in which said grinding member is mounted to rotate, and which includes an opening below said grinding member through which wood pulp can fall;
a pit located below said opening and positioned to receive wood pulp falling therein;
securing means securing said pit to said grinder body in pressure-tight fashion, said grinder body and pit together defining said grinding chamber; and, discharge means in said pit defining an outlet for continuously discharging a pulp suspension therefrom;
said pit being supported completely from said grinder body independently of any foundational support.
2. An apparatus according to claim 1 in which said securing means includes a peripheral flange on said pit abutting said grinder body.
3. An apparatus according to claim 1 further including means for pressurizing said pressure-tight chamber.
4. An apparatus according to claim 1 in which said pit has a downwardly sloping base wall directing the pulp suspension from below said grinding member into said discharge means.
5. An apparatus according to claim 1 in which said pit has an arcuate base wall, and said discharge means is positioned at the lowest part of said base wall.
6. A pit for an apparatus as claimed in claim 1, the pit being adapted to be secured to said grinder body below said opening and to complete said grinding chamber.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI791827 | 1979-06-07 | ||
| FI791827A FI58359C (en) | 1979-06-07 | 1979-06-07 | MASSATRAOG FOER TRAESLIPMASKIN |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1163485A true CA1163485A (en) | 1984-03-13 |
Family
ID=8512714
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000353459A Expired CA1163485A (en) | 1979-06-07 | 1980-06-05 | Pulp pit for a grinder |
Country Status (5)
| Country | Link |
|---|---|
| BR (1) | BR8003493A (en) |
| CA (1) | CA1163485A (en) |
| DE (1) | DE3021287A1 (en) |
| FI (1) | FI58359C (en) |
| SE (1) | SE8004230L (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1811187A1 (en) * | 1968-11-27 | 1970-06-11 | Voith Gmbh J M | Two press grinder |
| FI57979C (en) * | 1978-02-16 | 1980-11-10 | Tampella Oy Ab | FOERFARANDE OCH SLIPVERK FOER SLIPNING AV VED UNDER TRYCK |
-
1979
- 1979-06-07 FI FI791827A patent/FI58359C/en not_active IP Right Cessation
-
1980
- 1980-06-04 BR BR8003493A patent/BR8003493A/en not_active IP Right Cessation
- 1980-06-05 CA CA000353459A patent/CA1163485A/en not_active Expired
- 1980-06-06 DE DE19803021287 patent/DE3021287A1/en active Granted
- 1980-06-06 SE SE8004230A patent/SE8004230L/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| SE8004230L (en) | 1980-12-08 |
| FI58359B (en) | 1980-09-30 |
| DE3021287C2 (en) | 1988-05-05 |
| DE3021287A1 (en) | 1980-12-18 |
| FI58359C (en) | 1981-01-12 |
| BR8003493A (en) | 1981-01-05 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |