JPS6014799Y2 - Pulper disintegration rotor - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a disintegration rotor for a pulper that rotates on a strainer in a processing tank of a pulper to turn papermaking stock such as waste paper into pulp.

Such a rotor is known, for example, from Japanese Patent Publication No. 54-1592.

This is done by installing straight or curved pump blades on the upper surface of the disintegrating blades that protrude outward at a constant distance from the center of the disc body in the circumferential direction. The pump blades assist in the agitation of the liquid and paper stock in the processing tank, which is performed by the defibrating blades, and this allows the agitation efficiency to be maintained at the same level or higher even if the thickness of the defibrating blades is halved, effectively reducing power consumption. The purpose is to

Generally, the functions required of a rotor are to agitate the liquid and paper stock in the tank by rotating, mechanically crush the paper stock by contacting the defibration blades, and at the same time create turbulent flow with a speed difference in the liquid. , the paper stock is torn into small pieces by the speed difference), the paper stock strips thus formed are introduced into the slashing zone between the lower surface of the defibrating blade and the strainer, and the paper stock strips are rubbed by this method. The process involves crushing the pulp into pulp and disintegrating it so that it can pass through the dead holes of a strainer.If a pump blade is installed upright on the top of the disintegrating blades as in the above-mentioned known example, the paper stock and liquid are disintegrated into a tank. Although the pump blades cannot introduce the paper stock particles into the thrashing zone, the disintegration efficiency is low.

Therefore, in the present invention, stirring blades are installed upright on the upper surface of the disc body of the rotor from around the top to the outer periphery of the adjacent spacing between the disintegration blades, and the flow is forcibly introduced into the thrashing zone by the stirring blades during rotation. The paper stock and liquid are stirred and flowed in the processing tank to improve not only the stirring but also the disintegration efficiency, which will be described below with reference to one embodiment shown in the drawings.

Reference numeral 1 denotes a disintegration rotor of the present invention, in which the top 2a of the medium-high disc body forms part of a spherical surface, and a gently inclined conical surface 2b skirts around the top to the outer periphery 2', and from the outer periphery 2'. A plurality of disintegrating blades 3 protrude at equal intervals S in the circumferential direction.

The disintegration blade and the disc body are integrally cast, and the disc body has a hollow portion open to the lower surface.

Reference numeral 4 denotes a processing tank of the pulper, and at the center of the bottom there is a central bottom plate 5 whose outer diameter is equal to S゜ to the diameter of the disk body, and in its outer sphere there is a central bottom plate 5 whose outer diameter is equal to S゜ to the protruding length of the disintegrating blade. There is an annular strainer 6 having a width slightly longer than that, and an outer annular bottom plate 7 in its outer space that continues to the lower end 4' where the diameter of the circumferential side wall of the tank 4 decreases downward in a straight or curved manner. The upper end of the inner peripheral side wall 8a of the annular gutter 8 having a U-shaped cross section is fixed to the lower surface of the central bottom plate 5, and the upper end of the outer peripheral side wall 8b is fixed to the lower surface of the outer peripheral annular bottom plate 7, and the pulped disintegrated paper material passes through the strainer 6. The water is received in an annular gutter 8 and flows out of the tank through a discharge port 8' provided at the bottom of the annular gutter 8.

In addition, the dead eye of the strainer is 3rIr in diameter! 3orr from n
r! The size of the disintegrated paper material to be obtained is selected from a range of approximately ft.

In order to fix and rotate the rotor 1, a vertical shaft 9 rotated by a motor and a speed reducer is inserted from below into a packing storage cylinder 5' that protrudes downward from around the central opening of the central bottom plate 5. An auxiliary cylinder 10 is fixed to the upper end of the auxiliary cylinder, and a flange 1 extends from the outer periphery of the upper end of the auxiliary cylinder along the upper surface of the central bottom plate.
The hollow part of the disc body of the rotor is fitted into the flange 10' from above, and the rotor is connected to the collar 10' with several bolts 11.

Thereby, the lower surface of each defibration blade protruding from the outer periphery of the disk body maintains a spacing of about 0.5 to 3 mm between the upper surface of the annular strainer 6 and forms a thrashing zone.

The spacing between the thrashing zones is also selected depending on the size of the disintegrated paper stock to be obtained.

If the entire lower surface of each disintegration blade is opposed to the upper surface of the annular strainer to form a thrashing zone, there is a risk that the space will be clogged with foreign matter, causing problems such as the rotor not rotating and the motor seizing up.

In order to prevent this as much as possible, a narrow downward protruding portion 3 is formed on the lower surface of each disintegrating blade protruding from the outer periphery of the disc body along the leading edge 3a facing in the rotational direction of the rotor (arrows in Figs. 1 and 4). ′
It is preferable that a thrashing zone is formed between the lower surface of the protrusion 3' and the upper surface of the strainer 6, and the remainder of the lower surface of the defibration blade is spaced further from the upper surface of the strainer than the lower surface of the protrusion.

The front end surface 3a' forming the leading edge 3a of each defibrating blade is inclined with respect to the vertical (Fig. 4), so that when the rotor rotates, the inclination of the front end surface draws the paper stock together with the liquid into the thrashing zone. good.

In the conventional example described above, a straight or curved pump blade is provided on the upper surface of the defibrating blade, extending from the base of the leading edge to the tip of the trailing edge and crossing the defibrating blade.

Therefore, the flow generated by being pushed by the pump blade passes over the upper surface of the defibration blade, heads toward the inner surface of the lower end 4' of the processing tank 4, and spirals upward in a convection manner along the slope of the inner surface of the lower end. Although it does stir the stock and liquid in the tank, it does little to introduce the stock into the thrashing zone.

On the other hand, in this case, the top part 2a of the disk body and the gently inclined conical surface 2
Stirring blades 1 are installed on the upper surface of the disk from near the boundary of b, that is, around the top 2a, to the outer periphery 2' of the interval between adjacent defibration blades.
2 was erected.

In this embodiment, the rotor has six disintegrating blades 3 equally spaced in the circumferential direction, and six stirring blades are provided across the mutual spacing between the six disintegrating blades, but the invention is limited to this. It's not a thing.

That is, the number of defibrating blades and stirring blades is determined appropriately according to the diameter of the rotor, and the number of defibrating blades is set to four, six, or eight.
The stirring blades may be arranged at intervals of every other defibrating blade so as to have half the number of defibrating blades, or the number of defibrating blades may be eight and the same number of stirring blades may be provided at all of the intervals.

As a result, the outer end of each stirring blade 12 ends at S at the outer periphery 2' located at the interval between adjacent defibration blades, so that the lower part f1 of the flow F generated by being pushed by the stirring blades when the rotor rotates is in the direction of rotation. On the other hand, toward the front end surface 3a' of the disintegrating blade on the rear side,
Forcibly introducing paper stock strips during thrashing and
A large piece of paper is brought into contact with the upper edge of the front end surface of the defibration blade to mechanically shred it into small pieces.Also, the upper layer f2 of the flow F is used to transfer paper stock and liquid to the sloping lower end 4' of the processing tank, similar to the conventional one. , and swirl it upward in a convection pattern.

Of course, the stirring blades shatter large pieces of paper that come into contact with them into small pieces.

Therefore, in addition to stirring the paper stock and liquid in the tank, the rotor of the present invention forcibly introduces small pieces of paper stock together with the liquid and disintegrates them into the thrashing zone, so the disintegration efficiency is extremely high, and the disintegration efficiency is extremely high, compared to the conventional pump with blades. A comparison test with a pulper of the same capacity using a rotor shows that the time required to disintegrate the same amount of paper stock can be halved.

If the front surface 12' of this stirring blade, which faces at least in the direction of rotation, is inclined with respect to the vertical in the same direction as the front end surface 3a' of the defibrating blade, as shown in FIG. pieces can be introduced, and the disintegration efficiency can be further improved.

Further, the upper surface of each stirring blade 12 is inclined less than the inclination of the conical surface 2b of the conical body, so that the height of the conical surface 2b from the upper surface gradually increases from the inner end 12a to the outer end 12b. ing.

This is to create appropriate turbulence in the flow F generated by the stirring blades, mainly in the upper layer for stirring.If this is not necessary, the inner end 12a and the outer end 12b are at the same height, and the conical surface 2
It may be parallel to b, or conversely, the height may be lowered from the inner end toward the outer end.

The planar shape of each stirring blade is such that the inner end 12a is located above the base of the leading edge (the inner end 12a is on the front side with respect to the rotational direction of the two adjacent defibrators), and the stirring blade recedes in a curved shape toward the outer end. However, as mentioned above, it may be straight, that is, in the shape of an S.

Thus, according to the present invention, it is possible to provide a disintegrating rotor for a pulper with extremely high disintegration efficiency, which not only agitates the paper stock and liquid in the processing tank but also actively introduces the paper stock pieces into the thrashing zone to disintegrate them. can.

[Brief explanation of the drawing]

The drawing shows an embodiment of the disintegrating rotor of the present invention.
Figure 1 is a partially sectional side view of the pulper installed, Figure 2 is an enlarged plan view of a portion of the same as above, and Figure 3 is the
4 is a sectional view taken along the line IV-IV in FIG. 2, and FIG. 5 is an enlarged sectional view taken along the line ■-■ in FIG.
In the figure, 2 is a disc body, 3 is a defibrator, and 12 is a stirring blade.

Claims (1)

[Scope of Claim for Utility Model Registration] In a rotor for disintegrating a pulper, in which a plurality of disintegrating blades protrude from the outer periphery of a medium-high disk body at equal intervals of S゛ in the circumferential direction, on the upper surface of the disk body, the apex thereof is S゛. A rotor for disintegrating a pulper, characterized in that stirring vanes whose outer ends end at the outer periphery of a disc body are installed upright from the circumference to the outer periphery of the disintegrating vanes at adjacent intervals.