JP3249503B2 - Screening equipment for papermaking - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001] The present invention relates to a papermaking screen device,
In particular, the present invention relates to a papermaking screen device having a plurality of screens in a tank.

[0002]

2. Description of the Related Art Conventionally, some papermaking screen devices have a plurality of screens in a tank in order to efficiently separate useful fibers and foreign matter (for example, Japanese Utility Model Publication No. 6-40636). reference).

In a conventional papermaking screen device,
A rotating agitator (6) is provided inside the outer cylindrical screen (4) to separate useful fibers and foreign matters while preventing clogging of the screen to some extent.

[0004]

However, since the interaction between the pressurization and the negative pressure by the agitator (6) is performed on the papermaking material outflow side of the outer cylindrical screen (4), sufficient pressure is not generated. Clogging is likely to occur in the cylindrical screen (4). Immediately after the agitator (6) passes, negative pressure is generated in the vicinity of the screen eyes (gap portion formed by a round hole or a slit), and foreign matters move toward the accept side. The outer cylinder screen (4) is easily pulled and clogged, and the agitator (6) rotates inside the outer cylinder screen (4). And the dust removal effect is low. (In general, since the passing speed through a gap formed by a round hole, a slit, or the like is constant, the dust-removing effect increases as the circulation speed of the papermaking raw material flowing on the outer surface of the screen increases.) It is an object of the present invention to provide a papermaking screen device which solves the above-mentioned drawbacks.

[0005]

In order to achieve the above object, a papermaking screen apparatus according to the present invention comprises a papermaking raw material inlet, a first selective outlet, a second selective outlet, and a foreign matter outlet. A tank for storing the papermaking raw material, and a gap provided in the tank, the tank being divided into a first chamber and a second chamber, and formed with round holes or slits. A first screen having a cylindrical shape, an outer peripheral surface having a gap formed by a round hole or a slit, and an inner inner peripheral surface, and a top portion of the inner inner peripheral surface and a top portion of the outer peripheral surface And a second surface provided in the first room and outside the cylindrical first screen.
A screen, a rotator rotatably provided close to the ceiling surface of the second screen, and a rotatable member hanging down from the ceiling surface of the rotator and facing the outside of the first screen. A first agitating section, and a second agitating section hanging down from a ceiling surface of the rotator and provided to face an outer peripheral surface of the second screen, and the papermaking raw material in the primary chamber is provided. A stirring member for stirring the liquid,
In the first room formed inside the second screen and outside the second screen, the first selected outlet portion is provided in the first room and the outer peripheral surface of the second screen, In the first inner chamber surrounded by the inner inner peripheral surface and the ceiling surface,
The foreign substance outlet faces the first chamber in the first chamber, which is surrounded by the inner peripheral surface of the first screen, the inner peripheral surface of the second screen, and the ceiling surface of the rotating body. In addition, there is provided a bypass passage connecting the first 'chamber and the first''' chamber, and an adjusting means for variably adjusting the passage area of the bypass passage.

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

1 to 4, reference numeral 1 denotes a papermaking screen device. The papermaking screen device 1 is, for example, a screen that allows papermaking raw material to flow in from the outside to the inside of the screen and is carefully selected. A second screen 3 and a first screen 2 for removing dust, foreign matter and foreign matter are provided in a tank 4.

The tank 4 has an inlet 41, a first selective outlet 42,
It has a second selective outlet 43 and a foreign matter outlet 44 for storing papermaking raw materials to be processed.

The inlet 41 is in the material supply passage 41 ', the first selective outlet 42 is in the first raw material discharge passage 42', and the second selective outlet 43 is in the second raw material discharge passage 43 '. , Respectively.

The foreign matter outlet 44 is connected to a foreign matter discharge passage 44 ', and the foreign matter discharge passage 44' is provided with a foreign matter discharge passage opening / closing valve (not shown) for opening and closing the foreign matter discharge passage 44 '.

The tank 4 is provided, for example, with a first cylindrical screen 2 provided at the center of the tank 4 and divided into a first chamber 4a and a second chamber 4b by the first screen 2. I have.

The first screen 2 has, for example, a cylindrical shape, and has a closed portion at the top, an open portion at the bottom, a gap 21 formed on the side surface with a round hole or a slit, and a bolt 4 in the tank 4. (Not shown) or the like.

A second screen 3 is provided inside the first chamber 4a and outside the first screen 2.
The second screen 3 is fixed to the tank 4 with bolts (not shown) or the like.

The second screen 3 has an outer peripheral surface 32 having a gap 31 formed by a round hole or a slit, and the like.
Inner inner peripheral surface provided at a fixed interval from outer outer peripheral surface 32
The top of the inner inner peripheral surface 34 and the top of the outer outer peripheral surface 32 are connected by a ceiling surface 35. In this embodiment, the ceiling surface 35 is formed of a separate article and joined, and the joining portion is fixed, but as a result, the top of the inner inner peripheral surface 34 and the outer peripheral surface 32
It is only necessary that the relationship be such that the top and the ceiling are connected by the ceiling surface 35.

The gap 31 of the second screen 3 is made to be approximately the same size as the gap 21 of the first screen 2.
The papermaking raw material flowing from the inlet 41 is processed in parallel by the first screen 2 and the second screen 3.

Further, the rotating body 5 is rotatably attached to the ceiling surface 35 of the second screen 3, for example, is attached to a rotating shaft 51 connected to the center of the rotating body 5. Rotating shaft 51
Is rotated by transmitting rotation from a motor (not shown) via a belt 52.

The rotating member 5 is provided with a stirring member 6 for stirring the papermaking raw material in the primary chamber 4a. The stirring member 6 includes, for example, a plurality of first stirring units 61 that are provided to face the outside of the first screen 2 by hanging down from the ceiling surface of the rotating body 5 and the ceiling surface of the rotating body 5. And a second agitator 62 provided to face the outside of the outer peripheral surface of the second screen 3.

The entrance portion 41 is located inside the first chamber 4a and outside the second screen 3 in the first 'chamber 4a.
a1, the first selected outlet 42 is located in the first chamber 4a, and is the first "chamber surrounded by the outer peripheral surface 31, the inner inner peripheral surface 34, and the ceiling surface 35 of the second screen 3; 4a2, the foreign substance exit 44
Is located in the first chamber 4a and faces the first inner chamber 34 of the first screen 2, the second screen 3 and the first chamber 4a3 surrounded by the ceiling of the rotating body 4, respectively. Configuration.

A bypass passage 7 for connecting the first 'chamber 4a1 and the first''' chamber 4a3 is provided.
The bypass passage 7 is provided with adjusting means for variably adjusting the passage area of the bypass passage 7, for example, an opening / closing valve 71. While watching, the opening degree of the opening / closing valve 71 is adjusted to control the amount of the papermaking raw material supplied into the first 4′3 chamber 4a3 via the bypass passage 7.

Further, the papermaking raw material in the first '''chamber 4a1 is prevented from flowing into the first''' chamber 4a3, and the papermaking raw material in the first '''chamber 4a3 is 1's room 4
A plurality of projections 53 may be provided on the surface of the rotating body 5 facing the ceiling surface of the second screen 3 so as to guide to the a1.

At this time, a plurality of projections 53 are provided on the surface of the rotating body 5 facing the ceiling surface 35 of the second screen 3, so that the papermaking raw material is changed from the first 4 '' chamber to the first 1 '' chamber 4a3. 4
When moving to a1, the papermaking raw material is disintegrated and the first 'chamber 4a
1 can be moved. As a result, for example, a conventional apparatus that receives a tail dissected by a primary screen in a tank, disintegrates the dissected tail in the tank with a disintegrator, and selects the papermaking raw material disintegrated by the disintegrator on a secondary screen. The papermaking screen device 1 of the present embodiment
According to this, one papermaking screen device 1 can be used.

Further, as a method for effectively disintegrating the papermaking raw material, for example, as shown in FIGS.
And a plurality of protrusions 36 may be provided on the ceiling surface 35 of the second screen 3 facing the rotating body 5.

A passage 45 'for introducing dilution water or washing water into the first 4'3 chamber 4a3 is directly connected to the first 4'3 chamber 4a3.
However, in this embodiment, for example, as shown in FIG.

Accordingly, in the papermaking screen apparatus 1 shown in FIGS. 1 to 4, a papermaking raw material is supplied by a pump (not shown) to the first 'chamber 4a1 via the raw material supply passage 41' and the inlet 41. Further, the opening / closing valve 71 is opened and the bypass passage 7 is opened.
When the rotating body 5 is rotated while being introduced into the first 4 ′ chamber 4a3 via the, the interaction between the pressurization and the negative pressure by the stirring units (61, 62) is performed on the screens (2, 3). At the inflow side of the papermaking raw material.

That is, in the first 'chamber 4a1, the second'
Screen 3 and outer peripheral surface of the second screen 3
The interaction between the pressurization and the negative pressure by the second agitating section 62 provided opposite to the outside of the nozzle 32 is performed on the papermaking material inflow side of the second screen 3 to generate a sufficient pressure to generate a sufficient pressure in the papermaking material. Is passed through the gap 31 formed by the round holes or slits of the second screen 3, and immediately after the second stirring section 62 passes, the useful fibers of the second screen 3 The vicinity of the gap 31 formed by the step becomes negative pressure, and the foreign matter attached to the gap 31 is removed by the backflow of the papermaking raw material from the accept side. And the foreign matter can be efficiently separated, and the second stirring unit 62 rotates outside the second screen 3, so that the papermaking material circulation speed flowing on the outer surface of the second screen 3 increases, The dust removing effect can be enhanced.

The papermaking raw material containing the useful fibers guided into the first 4 ″ chamber 4a3 is agitated by the first agitating section 61, and as a result of the agitation, the useful fibers that have been disintegrated are removed from the gap 21.
, And guided to the outside of the tank 4 via the second chamber 4b and the second selective outlet 43.

By opening a foreign matter discharge passage opening / closing valve (not shown) of the foreign matter discharge passage 44 ′ connected to the foreign matter outlet 44, foreign matter in the first 4 ″ chamber 4 a 3 can be removed from the tank 4. Can be removed.

When the concentration of the papermaking raw material in the first 4 ″ chamber 4a3 is high, the dilution water introduction / exhaust pipe opening / closing valve 45 ′ of the dilution water introduction / exhaust pipe 45 ′ connected to the dilution water introduction port 45 is provided. By appropriately opening ′, water can be supplied into the first 4 ″ chamber 4a3 to adjust the concentration of the papermaking raw material to an appropriate value.

In particular, when the concentration of the papermaking raw material in the first 'chamber 2a1 is high, dilution water can be introduced into the first''' chamber 2a3 from the passage to adjust the concentration of the papermaking raw material. When a large amount of foreign matter or the like remains in the first 2 ″ room 2a3, washing water is introduced from the passage 45 ′ to remove the first 2 ″ room 2a.
3 can be cleaned.

The gap 21 formed by a round hole or a slit and the round hole or slit of a gap 31 formed by a round hole or a slit are examples of the gap 21 and the gap 31. The portion 21 and the gap portion 31 may have a gap for separating the useful fiber and the foreign matter.

[0031]

According to the first aspect of the present invention, the adjusting means is adjusted through the bypass passage by adjusting the adjusting means while observing the state of foreign matter mixed in the papermaking raw material and the concentration state of the papermaking raw material in the first 'chamber. It is possible to control the amount of papermaking raw material supplied into the room of '''.

[Brief description of the drawings]

FIG. 1 is a schematic front sectional view of a papermaking screen device according to one embodiment of the present invention.

FIG. 2 is a schematic partially enlarged front sectional view of the papermaking screen device showing a part of FIG. 1 in an enlarged manner.

FIG. 3 is a schematic cross-sectional view taken along line AA of FIG. 1, and arrows indicate the rotation directions of a first stirring unit and a second stirring unit.

FIG. 4 is a schematic bottom view of the rotating body of FIG. 1 as viewed from the back side.

FIG. 5 is a schematic partially enlarged front sectional view of the papermaking screen device, showing another embodiment of FIG. 2;

FIG. 6 is an explanatory view schematically showing a main part of another embodiment of FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Papermaking screen apparatus 2 1st screen 3 2nd screen 4 Tank 4a 1st chamber 4b 2nd chamber 5 Rotating body 6 Stirring member 7 Bypass passage

Claims (1)

(57) [Claims] 1. A tank having an inlet portion for papermaking raw material, a first selective outlet portion, a second selective outlet portion, and a foreign material outlet portion, and a tank for storing the papermaking raw material; A first screen having a cylindrical shape having a gap formed by a round hole or a slit and the like, and a gap formed by a round hole or a slit and the like. The first room having an outer peripheral surface having a ceiling surface connecting an apex of the inner inner peripheral surface and a top of the outer outer peripheral surface, comprising an inner inner peripheral surface, A second screen provided outside the cylindrical first screen; a rotator provided rotatably in proximity to a ceiling surface of the second screen; A first stirrer provided opposite to the outside of the first screen, and A second stirring unit that is provided to face the outer peripheral surface of the second screen, which is suspended from a ceiling surface, and a stirring member that stirs the papermaking raw material in the primary chamber; In the first room formed in the first room and outside the second screen, the first selective outlet is provided in the first room and the outside of the second screen. In a first ″ chamber surrounded by an outer peripheral surface, the inner inner peripheral surface, and the ceiling surface, the foreign substance outlet portion is located inside the first screen and the second screen in the first chamber. An inner peripheral surface and a bypass passage connecting the first 'chamber and the first''' chamber, respectively facing the first '''chamber surrounded by the ceiling surface of the rotating body; A papermaking screen provided with adjusting means for variably adjusting the passage area of the bypass passage. Location.