CN2709492Y

CN2709492Y - Disk mill for fiberizer

Info

Publication number: CN2709492Y
Application number: CN 200420068231
Authority: CN
Inventors: 陈永生; 陈瑜
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-07-26
Filing date: 2004-07-26
Publication date: 2005-07-13
Anticipated expiration: 2014-07-26

Abstract

The utility model discloses a grinding disc used in a pulp grinder, which comprises a rotary grinding disc installed on a main shaft of the pulp grinder and a fixed grinding disc installed on a casing of the pulp grinder and matched with the rotary grinding disc, wherein, toothed surfaces of the rotary and the fixed grinding discs are provided with concentric-circle retaining dams, the interval between each two concentric-circle retaining dams forms a section, each grinding disc is provided with three or more than three concentric-circle sections, the width of the section decreases following the increase of the radius, and the tooth depth of grinding teeth also decreases following the increase of the radius. The first circle of grinding-tooth work face on the rotary grinding disc and near the center of circle and the plain face of the grinding disc form an inclined sharp angle. The utility model has the advantages of simple structure and capacity of reducing the energy consumption and improving the quality and the yield of the ground pulp.

Description

The mill that is used for fiberizer

Technical field

The utility model is mainly concerned with the fiberizer field, refers in particular to a kind of mill that is used for fiberizer.

Background technology

In the prior art, refining equipment mainly is jordan (comprising cylindrical and conical) and disc mill (double plate and single-deck), and the latter's application is more extensive.Disc mill is divided into high dense and low dense again according to the concentration of institute's defibrination material, it is generally acknowledged that slurry concentration being to hang down densely 5% below, is that height is dense more than 5%.The concentration height slurry be difficult to enter in the narrow and small mill slot, form so-called " bridge formation " phenomenon, particularly those thicker this kind of slurry phenomenons are even more serious.In order to solve the problem that is difficult for entering slot than coarse particles, made one " fracture area " at the stock inlet of mill in the prior art, coarse particles enters the correct grinding district of narrow slot again after " fracture area " fragmentation.But the ratio of the shared mill area of this method " fracture area " is very big, and correct grinding district area is greatly reduced, and it is few to cause slurry to improve through " beating degree " (degree of test slurry thickness) behind the grinding machine, and this has just influenced whole structure.High dense and low dense mill no matter, the retaining dam of its mill slot also is another reason that causes above situation very little.In order to obtain the slurry of height " beating degree ", generally take many grinding machine tandem workings, but being not suitable for pipeline, carries high consistency stock, so high dense grinding machine is not easy to tandem working.Therefore, most of producers all select the high low dense fiberizer of energy consumption for use.Moreover the wide shape slot of the most employings of the groove of mill, this profile of tooth is the easiest phenomenon that causes slurry to stop up slot when refining concentration higher (more than 6%), and particularly those roll flutes surfaces cast more coarse mill, and this phenomenon is particularly serious.For a long time people be devoted to the roll flute shape research to improve refining effect, but ignored an important problem, that is exactly: the hanging amount is inhomogeneous on the whole mill flank of tooth.Because advance to starch radius less, the pulp radius is bigger, slurry moves to the long radius direction after minor radius enters slot, girth constantly increases, this just will inevitably cause the continuous attenuation of slurry, the outlet girth is than reaching more than 3 times that import girth has, and in other words, the slurry thickness in exit has only about 1/3 of import department.But slurry is not a clear water, there is no fear of being evenly distributed in all teeth groove, and is all the more so when particularly concentration is higher.The major part of the slurry that mill is not good fully is slurry group and lumps in addition, and this has just caused a lot of flank of tooth to hang the phenomenon of not starching.Can imagine thus, the mill radius is big more, it is just serious more that its flank of tooth does not have the hanging phenomenon, but the operator has only the pressure that strengthens between two mills for the beating degree that improves slurry, the pressure of the roll flute that hangs up slurry is on a small quantity increased, cause fiber is cut off, a large amount of long fibers have become staple fibre, and the tension intensity that makes into paper descends, and owing to hanging inequality on the whole dish tooth, there are a lot of flank of tooth not hang up slurry, these flank of tooth that do not hang up slurry have caused the direct friction between the metal covering, noise shake ear, and grinding machine outlet slurry temperature is very high, thereby lot of energy changes heat energy and acoustic energy into, caused power consumption serious.

The utility model content

The technical problems to be solved in the utility model just is: at the technical problem that prior art exists, the utility model provide a kind of simple in structure, can reduce the mill that is used for fiberizer that energy consumption can improve defibrination quality and output again.

In order to solve the problems of the technologies described above, the solution that the utility model proposes is: a kind of mill that is used for fiberizer, this mill comprises rotary grinding disk that is installed on the fiberizer main shaft and the fixed millstone that cooperates with rotary grinding disk that is installed on the fiberizer housing, it is characterized in that: the flank of tooth of described rotary grinding disk and fixed millstone is provided with concentric circles retaining dam, per two concentric circles retaining is an interval between the dam, every mill is provided with the concentric circles interval more than 3 or 3, interval width strengthens with radius and diminishes gradually, and the roll flute tooth depth also strengthens with radius and diminishes gradually; The working face of the first lap roll flute in the close center of circle and mill plane form acute rake angle on the rotary grinding disk.

Be the 40-50 degree near the first lap roll flute in the center of circle with mill plane formation acute rake angle on the described rotary grinding disk, the spacing of per two roll flutes is 20mm or more than the 20mm in the first lap roll flute.

It is 1.6 times of pulp place, outer ring tooth depth that described mill roll flute advances slurry place tooth depth.

Compared with prior art, advantage of the present utility model is:

1. the first lap roll flute working face of rotating disk is made with the mill plane and become acute rake angle, be subjected to the effect of centrifugal force and axial thrust when making slurry enter rotating disk so simultaneously, therefore enter very soon after pressing slurry to grind by the inclined teeth inclined-plane fixedly in the mill first interval slot, play a part traditional mill fracture area, and much thinner than the slurry after traditional mill fracture area.

2. because mill advances the tooth depth increasing of slurry place, strengthen tooth depth with radius and reduce gradually; Distance between the two concentric circles retaining dam also strengthens with radius and reduces gradually, can solve the uneven problem of hanging on the whole mill flank of tooth so substantially, stopped the direct friction between the mill metal flank of tooth, thereby eliminated the operating noise of grinding machine, reduced the temperature of wearing into slurry, increase the service life of mill, greatly reduced the ton slurry power consumption of defibrination operation.Owing to can make flank of tooth hanging amount be evenly distributed, thereby reduce unit pressure, eliminated the cutting action of fiber substantially, thereby made the fiber wire-dividing broom purification to greatest extent, keep the original length of fiber, be enhanced to the tension intensity of paper, reduced the loss of fiber.

3. use mill of the present utility model can increase slurry and alternately shear number of times, increased the beating degree of separate unit fiberizer, improved the defibrination quality by two mill roll flutes.

4. the utility model has strengthened the width and the degree of depth (surpassing 20mm) of the one-level slot (stock inlet) of rotary grinding disk, avoided high consistency stock " bridge formation " phenomenon at import slot place, also help the half a lifetime pulp particle simultaneously and enter slot, thereby improve the throughput of slurry, the defibrination output of unit interval is greatly improved.

Description of drawings

Fig. 1 is the generalized section that the utility model is installed on fiberizer;

Fig. 2 is that the master of the utility model rotary grinding disk looks generalized section;

Fig. 3 is the A-A generalized section of first order roll flute on the utility model rotary grinding disk;

Fig. 4 is the side-looking generalized section of the utility model rotary grinding disk;

Fig. 5 is that the master of the utility model fixed millstone looks generalized section;

Fig. 6 is the side-looking generalized section of the utility model fixed millstone.

The specific embodiment

Below with reference to accompanying drawing the utility model is described in further details.

As shown in Figure 1, a kind of mill that is used for fiberizer of the present utility model, this mill comprise rotary grinding disk 1 that is installed on the fiberizer main shaft 3 and the fixed millstone 2 that cooperates with rotary grinding disk 1 that is installed on the fiberizer housing 4.

Shown in Fig. 2-6, the flank of tooth of rotary grinding disk 1 and fixed millstone 2 is provided with concentric circles retaining dam 5,7, per two concentric circles retaining is an interval between the dam 5,7, every mill is provided with the concentric circles interval more than 3 or 3, interval width strengthens with radius and diminishes gradually, and the roll flute tooth depth also strengthens with radius and diminishes gradually; The working face of the first lap roll flute 6 in the close center of circle and mill plane form acute rake angle on the rotary grinding disk 1.

First lap roll flute working face and mill plane formation acute rake angle near the center of circle on the rotary grinding disk 1 are the 40-50 degree, and in preferred embodiment, this acute rake angle is 45 degree, and other roll flutes are commutating tooth.

It is 1.6 times of pulp place, outer ring tooth depth that the mill roll flute advances slurry place tooth depth.

Concentric circles retaining dam 5,7 on the rotary grinding disk 1 and fixed millstone 2 flank of tooth is arranged alternately for dislocation, slurry enters the first concentric circles interval of rotary grinding disk 1 roll flute, because interval roll flute spacing is more than 20mm, the degree of depth is also more than 20mm, the slurry that concentration is big can not produce " bridge formation " phenomenon in so big import department, and enters smoothly in the mill district.The profile of tooth working face in rotary grinding disk 1 first interval becomes acute rake angle (between 40 °-50 ° with the mill plane, the angle of the utility model most preferred embodiment is 45 °), after entering between the helical teeth, slurry rotated centrifugal force simultaneously and by the effect of axial thrust two power of the ramp effect of tooth and enter in the first interval slot between two concentric circles of fixed millstone 2.Exist in the time of because of inertia force and pressure, slurry can wash away rapidly along outer circular direction, runs into just can change behind second concentric circles retaining dam 7 in the slot that direction enters rotary grinding disk 1 roll flute second interval.At this moment, slurry is subjected under the dial rotation action of centrifugal force, washes away toward the outer circular direction of rotating disk, just changes again behind second concentric circles retaining dam 5 of running into rotating disk roll flute 1 in second interval that direction pours fixed millstone 2 roll flutes.Like this 4 cycles of alternate cycles, slurry obtains the chance shearing (i.e. making beating) and rub totally for 8 times, and this is that traditional any type of fiberizer is all incomparable.

Claims

1, a kind of mill that is used for fiberizer, this mill comprises rotary grinding disk that is installed on the fiberizer main shaft and the fixed millstone that cooperates with rotary grinding disk that is installed on the fiberizer housing, it is characterized in that: the flank of tooth of described rotary grinding disk and fixed millstone is provided with concentric circles retaining dam, per two concentric circles retaining is an interval between the dam, every mill is provided with the concentric circles interval more than 3 or 3, interval width strengthens with radius and diminishes gradually, and the roll flute tooth depth also strengthens with radius and diminishes gradually; First lap roll flute working face and mill plane near the center of circle on the rotary grinding disk form acute rake angle.

2, the mill that is used for fiberizer according to claim 1, it is characterized in that: be the 40-50 degree near the first lap roll flute working face in the center of circle with mill plane formation acute rake angle on the described rotary grinding disk, the spacing of per two roll flutes is 20mm or more than the 20mm in the first lap roll flute.

3, the mill that is used for fiberizer according to claim 1 is characterized in that: it is 1.6 times of pulp place, outer ring tooth depth that described mill roll flute advances slurry place tooth depth.