CS207809B1 - Device for working the fibrous suspensions by the mechanical action of the knives - Google Patents

Description

Cupid of the invention PAVELKA ARTÚR, ing. And PEAR JAROSLAV, ing., BRATISLAVA

Apparatus for processing fibrous suspensions by mechanical action of knives

BACKGROUND OF THE INVENTION The present invention relates to an apparatus for treating fiber suspensions by the mechanical action of knives, provided with one fixed (stator) and one movable (rotor) part.

All prior grinding loads are characterized in that the components of the rotor peripheral velocity vector resulting from the decomposition of the rotor peripheral velocity vector into the stator blade direction and the rotor direction are proportional to each other in proportion to the rotor to stator component 1 to 1.

1.4 with the vast majority of versions 1 and 1.2.

Hence, there is only a small relative movement between the blades of the stator and the rotor in the direction of the edge of one of the blades, that is, only a small tangential or cutting movement. It is more of a sideways movement, with relatively short fiber-knife edge contact, which must then be strong, energetic to perform functional work.

Another disadvantage of the existing design of the blades is that the grooves between the individual blades function as channels of a centrifugal pump with a considerable pumping effect,

In this case, the machine is inoperative for fiber processing, and thus unnecessary washing devices.

The above mentioned drawbacks are removed in the device according to the invention whose principle consists in that the blade or cutter of the rotor and stator enclose an angle in the range of 0 ° to 90 wherein the rotor blade or cutter groups have from the radial direction of the rotor deflection of 50 ° to 90 ^0, and the grooves between the blades of one group are very narrow, in the range of 0.1 to

2.5 mm, so that the pumping effect is reduced to a minimum. This is unfavorable

207 809

- 2 107 BOB position of the grooves with respect to the pumping effect and unfavorable dimensions of most flow grooves. Furthermore, it increases the residence time of the fibers in the wear, increases the number of interventions of one Alma with knife edges and surfaces, increases the uniformity of fiber treatment and the possibility of gentle processing of the fibers, prolongs contact of the fiber with the knife edge.

It is possible to confirm experimentally and it has been verified on the plant that the load according to the invention is able to achieve (in the fibrillation version) a specific consumption even below 6 kWh / t ° SR. This represents a saving of energy for grinding of at least 25% compared to the current world level in grinding machines. The ejection ejects at 1000 rpm at an operating speed. so-called reactive energy consumption of about 15% of the power input of the grinding machine (at its maximum load), ie about half of the current front grinding equipment. In the field tests, it has been shown that a drive electric motor with approximately 60% of the power of the existing drive units will be sufficient to drive the milling apparatus of the present invention. When applied to a certain paper industry program, this means savings of more than 10 million kWh / year * When extended to the oil industry, even tens of millions of kWh / year.

Another advantage of the invention is the very silent cast. The level of sound level during grinding is at the sound level of today's driving electric motor. The noise of current grinding organs is substantially greater.

The design principle makes it possible to apply this type of mlele organs in the area of not only fibrillation but also universal and shortening mlele effect.

The quality of the fiber treatment of the device according to the invention is at the top of the world. The ratio between the degree of grinding and the mechanical properties achieved is at least at the current world level. Due to the low pumping effect, the wear can be provided with considerably higher knives than hitherto, which increases the wear life of the wear.

The enrichment according to the invention can also be used successfully for regenerative grinding of corrugated paper, with a very low amount of energy (about 3 kWh / t ° SR) achieving high quality of this secondary pulp (preferably with subsequent separation of zero fibers).

The construction of the load allows the use of 1 in the area of increased densities of the papermaking fluid (twice as much used today), further decreasing the specific energy consumption by 30-40%.

Even the most modern and laoina casting technology can be used in the manufacture of the coating according to the invention, however, the maximum effect of operational energy savings is achieved by fibrillation loading in anodomeohanloque and chipping or potting knives in bitumen or other suitable plastic.

The greater effect of the new imposition makes it possible to simultaneously reduce the number of mole units in the papermaking production line and thus also saves on the investment.

The design is basically applicable to both disc and cone mills.

The attached drawings show rotor and stator loading arrangements.

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Fig. 1 is a vector diagram showing the distribution of the circumferential lyohality vector of the rotor into components along the edges of the blades.

Figures 2 and 2g show a front view of a rotor and stator segment of a disk mill with parallel knives in all knife groups of the segment and channels between these groups parallel to them. Fig. 2 is a cross-sectional view of the knife arrangement. Figure _3A-3G is a front view of a sector stator and rotor disc mill, wherein the knives of each group are parallel and KDS each group have the same angle relative to the radial direction. Figure 4 _A and 4 g is a similar view, wherein in segment all the groups of knives are parallel, but the channels between different groups are inclined to this direction. Figure _4C shows a detail of the arrangement of knives in groups.

Figure 5 _A and 5 _B are segments of the stator and rotor from the front view, wherein the edges of the knives are formed by closed curves, in this case the rings are mutually parallel channels between each group. Figure 6 shows a schematic longitudinal section showing the application of the knife system in a disc mill.

In the housing, the machine is mounted rotating! and an axially adjustable shaft 2 having a rotor 3 mounted thereon, arranged in the working chamber 2 of the machine. The rotor is provided with a replaceable rotor shaft 4 made of one or more pieces and consisting of several knife groups with a uniform geometrical arrangement of the knives in a single group. The chamber 2 is closed by a fixed or axially displaceable lid 6, which together with a fixed but replaceable stator shaft f forms the stator of the functional part of the machine. Similar to the rotor bearing 4, the stator bearing 2 is also made in one or more pieces and consists of several knife groups with a uniform geometrical arrangement of the knives in a single group. A working gap 8 is arranged between the stator shaft 2 ^{and the} rotor shaft 4, in which ae the processing of the pulp takes place by the knife edges and the surfaces of the blades which pass by. The pulp in the form of a water suspension is fed at the inlet 6 and after passing through the rotor shaft 4 through the stator shaft 2 ^{and the} working gap 8, it leaves the machine through the outlet 10.

The device according to the invention operates, similar to most current milling machines, by virtue of the mechanical effect of the knives on the fibers which come into contact with them.

The fibers are bruised inside, scuffed on their surface, torn and cut or chopped by passing the knives placed on the stator (fixed part) and on the rotor (rotating part), where the distance between the blades of the rotor and stator is so small oelulosic and wood fibers ee break as described above.

All prior grinding loads are characterized in that, according to FIG. 1, the components a in _g of the circumferential fineness vector of the rotor v resulting from the decomposition of the circumferential fineness vector into the direction of the stator blade and the rotor blades when the blades meet are in _g > 1 to 1,4 with the vast majority of designs between 1 and 1,2,

Hence, there is only a small relative movement between the stator blades and the rotor in the direction of the edge of one of the blades, that is, only a small tangential, i.e., a cutting movement of 800, of the movement. It is a faith movement.

In contrast, the device according to the invention for the fibrillation effect of fiber processing is distinguished and distinguished in that it is designed for the working area at higher ratios ⁱⁿ r ^{: v} s ^and t ° ^{in the} interval of 1.5 to 3. in the direction of one of the edges, i.e. a considerable effect of the outer differentials and the inner plastics of the fibers (internal fibrillation), without much demand for energy input.

Another feature of the difference between the present and the new term is a very sharp angle; The vector in the peripheral speed of the rotor and the direction of the blade edge of the rotor is in the range of 0 to 45 °, preferably 10 to 20 °. This results in a low pumping effect of the loading and hence a low so-called reactive power input of the mill, even at higher roaming speeds, such as 1,500 rpm, at a loading diameter of 500 mm. In addition, the residence time of the fiber is increased, it has a longer flow path, thus increasing the number of hits of one fiber by knife edges and surfaces per pass, thus increasing the grinding effect and the fiber processing being more uniform, that some fibers pass through the mill unprocessed.

The device according to the invention, designed specifically for the highly shortening effect of fiber processing, i.e. for cross-cutting the fibers, remains at a ratio in _r and _fl in the present embodiment close to 1, but is characterized by other advantages of the novel solution resulting from said acute angle. rotor peripheral velocities and rotor blade edges (low reactive power input, long fiber flow path).

The last novel feature of the device according to the invention (which is a suitable, not subtle constructional feature) is the grouping of knives into groups S, in one sector in FIG. 2. In one sector, the knives are preferably parallel to one another. The knife groups are formed by alternating several smaller and one larger gaps. The gaps between the parallel knives of one group are primarily intended to form knife edges, not to transport the fabric in the load.

Example 1

In FIG. 2 _A and 2 _β anáaomgna Gast onožení according to the invention in the embodiment A of the rotor, the embodiment B on the stator. Since the blades are advantageously parallel to each other, it is advantageous to use cutting technology to divide the blades into sectors and produce each separately with a group tool. Each segment is then attached separately to the stator / rotor / plate or cone, preferably by screwing two or more screws from the back of the stack.

The gap R, FIG. _2A and the others serve to distribute the fabric suspension between the knife groups S and the knife sectors and its dimensions are of the order of magnitude identical to the spaces M separating the knife groups B. The gaps M represent the main distribution channels of the fabric suspension as it moves. The slurry also flows partially through the gaps H between the knives in the group, especially in the type of casting for casting and for the shorter milling effect, and from there the fabric film formed between the stator and rotor knives is added. The distance H between the blades is

5,207,809 ranges from 0.3 to 6 mm, preferably 1 mm for fibrillation. The width of the blades T is chosen as a minimum as a functionally inefficient dimension and is 0.1 to 2.5 mm and preferably 1 to 1.5 mm.

Can also atatoru rotor and knives together in the working position form an angle of 0-65 ⁰ / technological requirements according to the kind / for fibrillating onožení and preferably 15 to 40 ° depending on the measurement point.

The blade sectors _t > are preferably of equal size and such that their smaller causes dimension 1 is equal to or greater than the transverse dimension L of the sector. The stator and rotor blades preferably have the same dimensions R, S, Η, mimo, T a. ^.

Example 2

In Figure 3 _A, 3 g onožení shows part of the invention In an embodiment, the rotor A and the embodiment B on the stator, in a circular arrangement of the knife groups P. The spacing between the knife groups S, are then formed not parallel but rftznoběžnými blades that delimit on the sizes M ^ and M ₂ . The blades in one group S are preferably parallel.

Ring in width preferably has a width in rňznou ^, in _{the second} . . up to _n , wherein v 1 is greater than ₂ , greater than _n ° of the inclination of the cutter, is preferably the same throughout the annulus of the stator or rotor.

The ring gap again serves to distribute the fabric suspension and amounts to 3 to 15 mm, depending on the size of the machine.

Example 3

A further embodiment of the device according to the invention is a segmented arrangement of the loading of V 'and of V as shown in Fig. 2g, with the difference that fewer traffic gaps M are arranged on the stator loading or are omitted in FIG. Then, the blade gaps H are preferably about 50% larger than in the embodiment of FIG. 2g.

IN

Example 4

A further variant of the embodiment according to the invention is an embodiment in which the dimensions according to FIG. 2 ( _A , Μ, Η, T, S and ββ) are not the same throughout the cutting segment.

Example 5

In FIG. 4 _A, 4 g is a variant embodiment in which the channels for the distribution of medium M are rftznoběžné toward nožft. This solution has the advantage that even with considerable radially positioned knives, the distribution channels of the substance M remain in a position which is advantageous in terms of pumping effect and in terms of substance retention.

Example 6

Figure 5 _A, 5 g represents an embodiment onožení with blade working edge closed in itself, a curved shape, wherein the working edges are formed mainly suitable openings or projections on the matrix of the rotor or stator.

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The knife groups S are again separated from each other by the channels R and M for the main distribution of the substance. The working edges are preferably circular in shape, preferably up to 5 mm in diameter.

Claims (1)

SUBJECT OF THE INVENTION Installations for the processing of fibrous suspensions by mechanical action of knives consisting of rotor knives and cooperating, most often stator knives, made of several knife groups characterized by similar or identical geometrical arrangement of knives in a single group, characterized in that the knife edge or rotor knife group , at the point of contact with the functional counterpart - most often the stator - forms with the knife edge or knife group of the counterpart / stator / acute angle in the range of 0 ⁰ to 90, preferably 30 ⁰ to 60 °, simultaneously deflecting the edge a radial of the rotor in the range of 50 ° to 90 °, preferably 70 ⁰ to 80 ^0, and that at least the rotor blades (4) or even the stator blades (7) are preferably arranged in such knife groups where parallel grooves between the knives in one group are made in the width of 0.1 to 2.5 mm, or in such wells -voltage groups, each blade group form one block provided on their contact surfaces with the locking holes and between these groups are the knife slot.