RU2365694C1 - Tackle of disk mill - Google Patents

Abstract

FIELD: textile; paper.

SUBSTANCE: invention can be applied in paper-and-pulp industry. Tackle contains rotor and stator disks, working surface of which is sectored, with knives and open grooves made in parallel by one of a generant of the circular sector. Lateral forming and cutting edges of knives, limiting grooves between knives are made in the form of concentric circular arcs.

EFFECT: increase of process intensification by prevailing tangent mechanical effects on fibrous semi-product that improves quality of fibrous semi-product treatment and reduction of energy consumption.

1 dwg

Description

The invention relates to grinding sets of disk mills and can be used in the pulp and paper industry at the stage of fine grinding.

Known grinding headset disk mill, including a rotor and stator disks, equipped with straight knives, alternating with through mezhnevyh grooves [1].

The disadvantage of this headset is that the angle of inclination of the straight cutting edges of the knives to the radius of the output circumferential edge depends on the angle of their inclination to the radius of the input circumferential edge and is always smaller in magnitude. Due to this, the tangent components of the peripheral velocities and forces at the inlet are always greater than at the outlet. Since the bulk of the concentrated fibrous semifinished product accumulates at the outlet due to mass back-up, the prevalence of the normal components of the peripheral speeds and forces over the tangents leads to its chopping and cutting, which reduces the quality of the finished product.

Known grinding headset, including rotor and stator disks, on the working surfaces of which are evenly distributed circular knife protrusions [2]. This form allows you to significantly increase the angle of inclination of the tangent cutting edges of the knife protrusions to the radius of the output circumferential edge. Therefore, at the intersection points, large tangential components of peripheral speeds and forces develop that have a fibrillating effect on the fibrous material.

A common drawback of headsets [1, 2] is that the knives are not tightly placed on their working annular surface. A significant part of this surface, located on the periphery of the disk, is not occupied by knives and is not used. This is due to the diffusivity of the grooves when the blades of constant thickness fan out from the center to the periphery of the disk. The maximum degree of development of cellulose fibers is achieved with the most dense distribution of knives on the grinding surface of the headset. When this condition is met, high values of the total and second lengths of the cutting edges of the knives are provided.

The closest in technical essence to the known solution is a grinding headset of a disk mill, including a rotor and stator disks, the working surface of which is divided into sectors, with straight knives made on them and through-knife grooves applied parallel to one of the side generators of the annular sector [3]. These features allow you to most closely place the knives on the annular grinding surface of the disk, increase the number, total and second length of their cutting edges, as well as the grinding ability of the headset.

The disadvantage of this headset is that the angle of inclination of the straight cutting edges of the knives to the radius of the output circumferential edge depends on the angle of their inclination to the radius of the input circumferential edge and is always smaller in magnitude. Due to this, the tangential components of peripheral velocities and forces at the inlet are always greater than at the outlet, which leads to the cutting of fibrous material and reduces the quality of the finished product.

The invention solves the problem of intensification of the grinding process, the processing quality of the fibrous semi-finished product, reducing energy consumption.

The technical result consists in increasing the intensification of the grinding process by the prevalence of tangential mechanical stresses on the fibrous semi-finished product, contributing to an increase in the processing quality of the fibrous material.

To ensure the indicated technical effect in the grinding set of a disk mill, including rotor and stator disks, the working surface of which is divided into sectors, with knives and through-cutter grooves made on them, applied parallel to one of the side generators of the annular sector, according to the invention, side generators and cutting edges knives bounding the inter-knife grooves are made in the form of concentric circumferential arcs.

The drawing shows a frontal projection of the working knife surface of the grinding headset disk mill. Working knife surfaces are shaded.

The grinding set of the disk mill includes rotor and stator disks, the working surface of which is divided into sectors, with knives 1 made on them and through-knife cut-outs 2, parallel to one of the side generators of the annular sector 3. The side generators 3 and the cutting edges of 4 knives 1, limiting inter-knife grooves 2 are made in the form of concentric circumferential arcs.

Grinding headset disk mill works as follows. Torque from the drive is transmitted to the shaft and to the rotor disk mounted on its leading end. The fibrous semi-finished product in the form of a suspension under pressure enters through the inlet of the stator disk and the inlet peripheral edge into the inter-knife cavity, where it is distributed along the inter-knife grooves 2 and rushes under the action of centrifugal and tangential forces towards the output circumferential edge.

The circumferential shape of the cutting edges of 4 knives 1 of the rotor and stator contributes to the fact that at the points of their intersection, large tangential components of peripheral speeds and forces develop. Therefore, in contrast to the known device, the fibrous prefabricated product is predominantly affected by tangential tensile forces, which contributes to its fibrillation. The processed fiber prefabricated product is sent to the next stage of the process.

Using the proposed grinding headset disc mill will allow:

- intensify the fibrillating effect on the fibrous prefabricated;

- to improve the quality of processing due to the predominant effect of tangential forces on the fibrous prefabricated product, which contributes to its greater fibrillation and preservation of the natural fiber length;

- reduce energy consumption due to the predominant effect of tangential forces on the fibrous prefabricated.

Information sources

1. V.F. Pashinsky. Machines for grinding pulp. "Forest industry", M., 1972, p. 81.

2. SU No. 967555, IPC В02С 7/08, announced on 06/10/1981, bulletin No. 39, published on 10/23/1982

3. RU No. 2307883, IPC D21D 1/30, B02C 7/12, notified April 3, 2006, bulletin No. 28, published October 10, 2007

Claims (1)

Grinding headset of a disk mill, including rotor and stator disks, the working surface of which is divided into sectors, with knives and through-cutter grooves applied parallel to one of the side generators of the annular sector, characterized in that the side generators and cutting edges of the knives that define the cutter-grooves are made in the form of concentric circular arcs.

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