FI109427B - Improved cone type pulp refiner - with double refiner plate pairs inside and outside conical rotor means - Google Patents

Abstract

The refiner has a support structure(1) supporting a horizontal framework(2) with a front lid(3) defining a cone shaped refining channel(4). The channel(4) has an axial entrance(5) and a radial outlet for refined pulp defined relative to the rotational axis(7). The refiner set has two fixed conical plates(13,14) outside two rotating conical plates(11,12) to form two refining conical paths. The rotating plates are fixed inside and outside of a rotor means(8) with a central cylindrical tube(10) for connection to drive shaft means(7).

Description

109427

IMPROVEMENTS IN PAPER MILLS USED IN PAPER MAKING

The invention relates to improvements to a conical pulp refiner for papermaking, initially comprising a support structure supporting 5 horizontally disposed bodies thereon, and a front cover having a refining chamber having a conical shape having a single axial inlet for the material to be refined, centrally located therein. , and a radially lateral outlet for already milled material.

Pulp refiners, which consist of conical refining surfaces in the usual manner, are now generally known, particularly in the manufacture of paper. In these, the conical refiner surfaces form a relative rotational movement between each other, which due to centrifugal force, conveys the mass fed to the inner surface of the refiner between the refiner surfaces properly ground.

Such currently known conical refiners are assembled from one pair of refining surfaces. One of the surfaces is a rotor mounted on the shaft and the other is a fixed stator mounted on the frame.

One simple conical refiner operating in the above range consists of an axially movable rotary refiner head which cooperates with another axially adjustable refiner head. Another type consists of I * ·! 'X 20 including rotary refiner head and axially movable fixed end,'. which allows adjustment of the spacing of the conical grinding surfaces.

Although currently known conical refiners can be widely used in the papermaking industry, they have some limitations and even: 'j'; even impracticality was observed. The most common problems are related to finding the best 25 production volumes. Increasing grinding volumes to size of grinding surfaces ....; enlarging is not advisable, given the particular dimensions of the device and the fact that ... this results in a significant increase in axial force and thus also in rotational power.

Therefore, in order to overcome the above deficiencies, an invention has also been devised. The object of the present invention is to provide improvements to the conical ':': pulp refiners used in papermaking, which in this context denotes the present invention, and which:.

2,109,427

The object of the invention is achieved by improvements in the pulverizer which are described in the characterizing part of claim 1.

According to the invention, the device mentioned in the first paragraph also comprises a pivot axis supported normally on the support structure, extending inside the frame and freely 5 and centrally to said grinding conical and internal chamber in which the grinding device itself is mounted, consisting of a pair of stationary cones , forming two grinding conical surfaces.

In other words, the device according to the invention is essentially 10 double refiners comprising one pair of axially fixed stationary refiner cones disposed between them. This assembly structure constitutes a novelty of the invention as well as refiner surfaces mounted on fixed and rotating maps to function normally, providing a frictional effect on the material passing between them.

15 The rotary end of the refiner is mounted on the end of the rotary shaft which moves within the refiner chamber. The assembly also comprises a control system mounted on the refiner cover which balances the forces exerted by the rotating refiner head.

The main object of the present invention is to provide a high speed refining unit consisting of two cones which is suitable for milled pulp from which paper or similar products are made. The above refining unit comprises a rotating and free-moving cone which minimizes the '' axial force exerted on the refining shaft, which saves energy as the grain size of the material to be refined can be increased.

It is another object of the invention to provide a double-cone refiner which is easier to manufacture and maintain than the conventional conical refiners;

The principles of the present invention are illustrated in the following figures:]! Figure 1. A perspective view with partial sectional views showing separately the elements of which the aforementioned rotating and stationary refining cone pairs are assembled.

: 30 Figure 2. Rotating conical rotor assembly from the inside in direction A of Figure 1

view.

I 109427! 3 i

Figure 3. Perspective view of a conical rotor with radial openings consisting of a rotor assembly and the above-mentioned advanced refiner cone pair.

Figure 4. Longitudinal cross-section of the aforementioned advanced cone refiner 5 and rotary and fixed cone pairs properly mounted therein.

In accordance with the above drawings, the conical pulp refinement enhancements suitable for papermaking, which are an object of the present invention, initially comprise a support structure 1 (Figure 4) supporting a 10 horizontally disposed body 2, and a front cover 3 a refining chamber 4 having a single axial inlet 5 for the material to be refined in the middle of the front cover 3 and a radial outlet 6 for the refined material. The device also comprises a rotary shaft 7 normally supported on the support structure 1;

Within the appropriately shaped structure, more particularly the refiner chamber 4, is mounted the refiner unit itself, which consists of fixed and rotating cones, the latter of which form between the two conical refiner surfaces.

1; * *. The shape of the aforementioned conical pairs is based on the shape of a tapered rotor 8 (Figs. 1 and 2) having a radial aperture 9 for passage of material · · · · * and having a tight fit at the free end of the rotary shaft:: but allowing axial movement projection 10. Said: ** · the conical rotor 8 corresponds to its inner and outer surfaces: 25 to the respective fixedly mounted refiner cones 11 and 12, thereby forming a radial conical rotor (Figure 3).

Clearly, as well as in another embodiment (not shown here), the radial · * · 'conical rotor may be formed from identical radial rotors which are also secured to the free end of the refiner and are themselves: · · ·' ': the wings are strongly conical rotor]. with two grinding surfaces on the inner and outer surfaces.

Similarly, and in addition, the fixed cone pairs of the inner refiner cone 13 and the external refiner cone 14 are fixed but have the possibility of axial adjustment by stiffening from the base 2 of the refiner chamber 4 4 109427 and directly from the inside surface of the front cover ro the inner side 11 and outer side 12 of the conical refiner and consistently and exclusively in between the conical surfaces or against jauhinvyöhykkeitä.

As a result, the material to be grinded is fed through an opening 5 (Fig. 4) in the center of the front cover 3, located directly at the narrower end of the radial rotor, from which it divides into two continuous streams, the first being guided internally to the front refiner cone 14 between the rotating refiner cone forming the surface 8 and the other diffusing towards the openings 9 of the narrower end 8 of the conical rotor, thence further guiding through the space defined by the inner surface 8 formed by the refiner cone 11 and the inner fixed cone 13 attached to the bottom of the refiner chamber 4.

After grinding between two refiner zones, these two streams of material jets split into an annular space that is formed of the same! 15 to the bottom of the refiner chamber 4 and thereafter fly out of the radial outlet 6.

It is important to note, as one of the main features of the advanced part of the invention, that the unique radial cone rotor produces a double flow operation, even though there is only one for the material to be ground. '": 20 axial inlets and one outlet for powdered material.

• *. In other words, the material to be refined from a single axial inlet flows into a refiner area formed by a gap between two rotating and fixed refiner cones, i.e., two refiner units are provided by a single machine.

• · • · The radial cone rotor allows half of the pulp to pass between the first 25 pairs of cones (the first being fixed and the other rotating) and the rest. through the openings above the conical rotor between the second pair of cones (the first being rotary and the second fixed), thereby forming two parallel flows of material on the surfaces of the cone pairs, which later join:. and leave the unit through one radial opening.

It is also important to consider the possibility that any part of an advanced refiner cone can be easily removed due to excessive wear.

• '; In the case of a fixed cone, the removal takes place either from the inner surface of the front cover 3 or from the bottom of the refiner chamber 4. In the case of a rotating cone, the removal takes place from the inner or outer surface of the radial cone.

Claims (4)

1. Improvements in conical pulp Dutch to be used in the manufacture of paper, to which initially belongs a supporting structure (1) supporting a horizontally placed frame (2), and a hood (3), on the inside of which is a greenhouse (4) having a conical shape in which there is provided an axial inlet (5) for the material to be milled, centrally located in the hood (3), and a radially extending outlet (6) for the already main material, characterized by in that said device also includes a axis of rotation (7) normally supported on the supporting structure (1) extending into the frame (2) and freely and centrally into the grinding and tapered and inner housing (4), each grinding device itself is installed the being formed by a pair of immobile cones and a pair of rotating cones, the latter being placed between the aforementioned, forming two grinding conical surfaces. 2. Improvements in conical pulp Dutch to be used in the manufacture of paper, according to claim 1, characterized by the fact that the rotating conical pair is! Formed by a tapered rotor (8) having a small bottom portion provided with circumferential apertures (9) for entering the material, comprising an inner and axially cylindrical outlet (10), closely adjacent, but to which there is a possibility of axial control in relation to the free end (7) of the rotating shaft, said conical '· ..: rotor (8) receives tili surfaces corresponding to internal and extremely corresponding grinding •' 213 · 'inner (11) and outer (12) cones which are fixed to the mounted forming a ,,; j radially tapered rotor. 3. Improvements in conical pulp Dutch to be used in the manufacture of paper, * ... according to claim 1 or 2, characterized in that the pair of immobile * · '* cones, that is, the inner grinding cone (13) and the outer grinding, the cone (14) 25 is fixedly fixed, but equally, that they have an opportunity for axial control, corresponding to the bottom of the frame (2) of the female housing (4) and the inner surface of its heated (3), oriented * * *. · * Corresponding in direction of the inner (11) and outer (12) of the radial conical rotor: grinding cones, and with a corresponding restriction between them, against each other. · '··' between conical surfaces or grinding areas acting mutually. * · ·: "30 4. Improvements in conical pulp Dutch to be used in the manufacture of paper,. ·. : according to claim 2, characterized in that the radial conical rotor is formed of a similar conical rotor, is similarly controllable relative to the rotatable free end of the Dutchman and is provided with double grinding end, in the case of the application with grinding knives or fins, its actual inner or outer surfaces.