JP2006283247A - Screen device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a screen device capable of improving cleaning efficiency. <P>SOLUTION: This screening device A is constituted by a vessel 1 for receiving papermaking raw materials, a screen 2 for partitioning the vessel 1 to a primary chamber 21 and secondary chamber 22, an agitating member 3 positioning at the outside of the screen 2 and agitating the papermaking raw materials in the primary chamber 21, a papermaking raw material-feeding passage 4 communicating with the primary chamber 21 of the vessel 1 and feeding the papermaking raw materials to the vessel 1, a foreign material-discharging passage 5 communicating with the primary chamber 21 and discharging the papermaking raw materials containing the foreign materials not passing through the screen 2 to the outside of the vessel 1 and a papermaking raw materials-discharging passage 6 communicating with the secondary chamber 22 and discharging the papermaking raw materials passing through the screen 2 to the outside of the vessel 2. The distance between the screen 2 in the primary chamber 21 and the inner wall of the vessel 1, opposing to the screen 2 is constituted so that the distance of the downstream side of the flow of the papermaking raw materials in the primary chamber 21 becomes larger than that of the upstream side of the flow of the papermaking raw materials. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

    The present invention relates to a screen device, and more particularly, to a screen device that can prevent foreign matters from flowing in through a screen and increase the efficiency of selection.

In the screen device, foreign matter is removed from the papermaking raw material through the screen. In other words, the fine fibers in the papermaking raw material pass through the screen, and the foreign matters in the papermaking raw material do not pass through the screen (for example, see Patent Document 1).
JP 2003-10608 (see FIG. 1)

In the above-described screen device, the papermaking raw material in the primary chamber that has not passed through the screen flows into the secondary chamber through the screen with water in the papermaking raw material along with the good fibers as it goes downstream. On the downstream side of the room, it becomes a papermaking raw material with a high concentration containing a large amount of foreign matter.
As a result, since the papermaking raw material containing foreign substances smaller than the screen flows into the secondary chamber as it goes downstream, there is room for improvement in terms of efficiency of selection.
The present invention provides a screen device that can increase the efficiency of selection.

    The screen device of the present invention for achieving the above-described object is a tank for receiving a papermaking raw material, a screen for partitioning the tank into a primary chamber and a secondary chamber, and an outside of the screen. A stirring member that stirs the papermaking raw material, a papermaking raw material supply passage that communicates with the primary chamber of the tank and supplies the papermaking raw material to the tank, and contains foreign substances that communicate with the primary chamber and do not pass through the screen. A foreign matter discharge passage for discharging the papermaking raw material to the outside of the tank, a papermaking raw material discharge passage for discharging the papermaking raw material that has passed through the screen to the outside of the tank, and the inside of the primary chamber. The space between the screen and the inner wall of the tank facing the screen is configured such that the downstream side of the papermaking raw material flow in the primary chamber is larger than the upstream side of the papermaking raw material flow.

  The screen device according to claim 2 is a tank for receiving a papermaking raw material, a screen for partitioning the tank into a primary chamber and a secondary chamber, and an inner side of the screen for stirring the papermaking raw material in the primary chamber. A stirring member that communicates with the primary chamber of the tank and supplies the papermaking raw material supply passage to the tank; and the papermaking raw material that includes the foreign matter that communicates with the primary chamber and does not pass through the screen. A foreign matter discharge passage for discharging to the outside of the tank, a papermaking material discharge path for discharging the papermaking raw material that has passed through the screen and passed through the screen to the outside of the tank, and the stirring member are rotatable rotors. The interval between the screen in the primary chamber and the outer peripheral surface of the rotor portion facing the screen is attached to the outer peripheral surface of the paper portion, and the interval between the papermaking raw material flow in the primary chamber from the upstream side of the paper raw material flow. Those that are configured to flow side increases.

  The screen device according to claim 3 is the screen device according to claim 1 or 2, wherein the secondary chamber has a flow of the papermaking material flow in the secondary chamber from an upstream side of the papermaking material flow in the secondary chamber. It is comprised so that a downstream side may become large.

    The papermaking raw material in the primary chamber contains a large amount of foreign matter because good fibers flow into the secondary chamber through the screen as it goes downstream. According to the screen device of claim 1, the screen in the primary chamber The distance from the inner wall of the tank facing the screen is configured so that the downstream side of the papermaking raw material flow in the primary chamber is larger than the upstream side of the papermaking raw material flow, that is, the outlet side of the papermaking raw material flow is compared with the inlet side. Because it is configured to be large in volume, compared to the conventional papermaking raw material containing foreign matter is difficult to dilute, preventing foreign matter from flowing in through the screen on the outlet side of the papermaking raw material flow in the primary chamber, The efficiency of selection can be increased.

    Further, according to the screen device of the second aspect, the papermaking raw material in the primary chamber contains a large amount of foreign matter because good fibers flow into the secondary chamber through the screen as it goes downstream. According to the described screen apparatus, the interval between the screen in the primary chamber and the outer peripheral surface of the rotor portion facing the screen is configured such that the downstream side of the papermaking raw material flow in the primary chamber is larger than the upstream side of the papermaking raw material flow. In other words, because the outlet side of the papermaking raw material flow is larger in volume than the inlet side, the papermaking raw material containing foreign substances is less likely to be diluted than in the past, and the outlet of the papermaking raw material flow in the primary chamber On the side, foreign matter can be prevented from flowing in through the screen, and the efficiency of selection can be improved.

    According to the screen device of claim 3, in addition to the effect of the invention of claim 1 or 2, the secondary chamber is provided in the secondary chamber from the upstream side of the papermaking raw material flow in the secondary chamber. Since the downstream side of the papermaking raw material flow is configured to be larger, that is, the outlet side of the papermaking raw material flow in the secondary chamber is configured to be larger in volume than the inlet side, the above-described claim 1. Or, in combination with the configuration of the primary chamber described in 2, the papermaking raw material containing foreign matter is more difficult to dilute compared to the conventional case, and the foreign matter flows in through the screen on the outlet side of the papermaking raw material flow in the primary chamber. Can be further prevented and the efficiency of selection can be increased.

A screen apparatus according to an embodiment of the present invention will be described with reference to the drawings.
In FIG. 1 to FIG. 3, A is a screen device. The screen device A includes a tank 1 that receives papermaking raw materials, a screen 2 that divides the tank 1 into a primary chamber 21 and a secondary chamber 22, and an outside of the screen 2. And a stirring member 3 that stirs the papermaking raw material in the primary chamber 21.

    The screen 2 has, for example, a plurality of openings 23 through which a papermaking raw material passes through a cylindrical side surface [the opening 23 is, for example, a rod-shaped longitudinal member arranged in a ring with a gap (longitudinal gap) And a round hole provided in a cylindrical side surface, and a slit (for example, a long and narrow rectangular gap)]. Yes.

    The interval between the screen 2 in the primary chamber 21 and the inner wall of the tank 1 facing the screen 2 is configured such that the downstream side of the papermaking raw material flow in the primary chamber 21 is larger than the upstream side of the papermaking raw material flow. 2 and 3, for example, as shown in FIG. 2 and FIG. 3, the tank 1 is configured to be H1 on the upstream side and H2 (H1 <H2) on the downstream side and facing the screen 2 in the primary chamber 21. Has a taper shape that expands toward the downstream side of the papermaking material flow.

    Reference numeral 4 denotes a papermaking raw material supply passage that communicates with the primary chamber 21 of the tank 1 and supplies papermaking raw material to the tank 1. Reference numeral 5 denotes a papermaking raw material that communicates with the primary chamber 21 and contains foreign substances that do not pass through the screen 2. A foreign matter discharge passage 6 for discharging the paper-making material to the outside of the tank 1 is a paper-making material discharge passage that communicates with the secondary chamber 22 and discharges the paper-making material that has passed through the screen 2 to the outside of the tank 1.

The stirring member 3 extends from a disk-shaped ceiling portion 33 located on the rotor portion 32 connected to the rotating shaft 31 provided in the tank 1 and is drooped, and a plurality of (in this embodiment, 4) are provided. The stirring member 3 rotates from a motor (not shown) via a power transmission member 7 (for example, a belt).
Further, the interval between the screen 2 in the secondary chamber 22 and the outer peripheral surface of the rotor portion 32 facing the screen 2 is larger on the downstream side of the papermaking raw material flow in the secondary chamber 22 than on the upstream side of the papermaking raw material flow. For example, as shown in FIGS. 2 and 3, the interval is configured so that the upstream side is h1 and the downstream side is h2 (h1 <h2). The opposing rotor part 32 has a tapered shape that decreases as it goes downstream of the papermaking raw material flow.
And by rotation of the stirring member 3 provided facing the outside of the screen 1, the papermaking raw material is stirred, and the fine fibers and foreign matters in the papermaking raw material are selected, and the screen 2 is washed. Foreign matters can be continuously removed from the papermaking raw material.

Accordingly, the papermaking raw material is supplied into the primary chamber 21 through the papermaking raw material supply passage 4. As the papermaking raw material in the primary chamber 21 goes downstream, good fibers flow into the secondary chamber 22 through the screen 2 together with water, and thus contains a large amount of foreign matter. However, the screen 2 and the screen 2 in the primary chamber 21 The distance from the inner wall of the tank 1 facing the tank is such that the downstream side of the papermaking raw material flow in the primary chamber is larger than the upstream side of the papermaking raw material flow, that is, the outlet side of the papermaking raw material flow is larger in volume than the inlet side. Therefore, it is difficult to dilute the papermaking raw material containing the foreign matter compared to the conventional case, and the foreign matter flows in through the screen 2 on the outlet side of the papermaking raw material flow in the primary chamber 21. The papermaking raw material that has been selected by the screen 2 to prevent and improve the selection efficiency is discharged out of the tank 3 through the papermaking raw material discharge passage 6.
Further, since the downstream side (part) of the papermaking raw material flow in the secondary chamber 22 is configured to be larger than the upstream side (part) of the papermaking raw material flow in the secondary chamber 22, that is, the secondary Since the outlet side of the papermaking raw material flow in the chamber 22 is configured to be larger in volume than the inlet side, the papermaking raw material containing foreign matters is more in comparison with the structure of the primary chamber 21 described above. It is difficult to dilute, and it is possible to further prevent foreign matter from flowing in through the screen on the outlet side of the papermaking raw material flow in the primary chamber 21 and improve the selection efficiency.

    In the embodiment of the screen device A shown in FIG. 1 to FIG. 3 described above, the screen 2 is an inward type screen device that carefully selects the papermaking raw material from the outside to the inside. However, the present invention is not limited to this, and can also be applied to an outward type screen device that selects paper-making raw materials from the inside to the outside.

    That is, in FIGS. 4 to 6, A is a screen device, and the screen device A includes a tank 1 for receiving papermaking raw material, a screen 2 for partitioning the tank 1 into a primary chamber 21 and a secondary chamber 22, and the screen 2 And a stirring member 3 that stirs the papermaking raw material in the primary chamber 21.

    The screen 2 has, for example, a plurality of openings 23 through which a papermaking raw material passes through a cylindrical side surface [the opening 23 is, for example, a rod-shaped longitudinal member arranged in a ring with a gap (longitudinal gap) Gaps, round holes provided in cylindrical side surfaces, slits (for example, elongated rectangular gaps)], and both the ceiling portion 25 and the bottom surface portion 24 are opened to stand in the tank 1. And fixed.

    Further, the interval between the screen 2 in the secondary chamber 22 and the inner wall of the tank 1 facing the screen 2 is larger on the downstream side of the papermaking raw material flow in the secondary chamber 22 than on the upstream side of the papermaking raw material flow. For example, as shown in FIGS. 5 and 6, the interval is configured such that the upstream side is H1 and the downstream side is H2 (H1 <H2), and is opposed to the screen 2 in the secondary chamber 22. The tank 1 is tapered so as to expand toward the downstream side of the papermaking raw material flow.

    Reference numeral 4 denotes a papermaking raw material supply passage that communicates with the primary chamber 21 of the tank 1 and supplies papermaking raw material to the tank 1. Reference numeral 5 denotes a papermaking raw material that communicates with the primary chamber 21 and contains foreign substances that do not pass through the screen 2. A foreign matter discharge passage 6 for discharging the paper-making material to the outside of the tank 1 is a paper-making material discharge passage that communicates with the secondary chamber 22 and discharges the paper-making material that has passed through the screen 2 to the outside of the tank 1.

The stirring member 3 extends from the ceiling portion 33 and the outer peripheral surface of the disk-shaped member positioned on the rotor portion 32 connected to the rotating shaft 31 provided in the tank 1 and is drooped. In the embodiment, 12) are provided. The stirring member 3 rotates from a motor (not shown) via a power transmission member 7 (for example, a belt).
The interval between the screen 2 in the primary chamber 21 and the outer peripheral wall of the rotor portion 32 facing the screen 2 is such that the downstream side of the papermaking raw material flow in the primary chamber 21 is upstream from the upstream side of the papermaking raw material flow in the primary chamber 21. For example, as shown in FIG. 5 and FIG. 6, the interval is configured to be h1 on the upstream side and h2 on the downstream side (h1 <h2), for example, in the primary chamber 21. The outer peripheral wall of the rotor portion 32 facing the screen 2 has a tapered shape that decreases as it goes downstream of the papermaking raw material flow.
Then, the papermaking raw material is stirred by the rotation of the stirring member 3 provided facing the inside of the screen 1, the fine fibers and foreign matters in the papermaking raw material are selected, and the screen 2 is washed. Foreign matters can be continuously removed from the papermaking raw material.

Accordingly, the papermaking raw material is supplied into the primary chamber 21 through the papermaking raw material supply passage 4. As the papermaking raw material in the primary chamber 21 goes downstream, good fibers flow into the secondary chamber 22 through the screen 2 together with water, and thus contains a large amount of foreign matter. However, the screen 2 and the screen 2 in the primary chamber 21 The distance from the outer peripheral wall of the rotor portion 32 that faces the outer wall of the rotor portion 32 is configured such that the downstream side of the papermaking raw material flow in the primary chamber 21 is larger than the upstream side of the papermaking raw material flow in the primary chamber 21. Since the outlet side of the flow is configured to be larger in volume than the inlet side, the papermaking raw material containing the foreign matter is less likely to be diluted as compared to the conventional case, and the foreign matter is present on the outlet side of the papermaking raw material flow in the primary chamber 21. The papermaking raw material selected by the screen 2 is discharged to the outside of the tank 3 through the papermaking raw material discharge passage 6 by preventing inflow through the screen 2 and improving the selection efficiency.
Further, since the downstream side (part) of the papermaking raw material flow in the secondary chamber 22 is configured to be larger than the upstream side (part) of the papermaking raw material flow in the secondary chamber 22, that is, the secondary Since the outlet side of the papermaking raw material flow in the chamber 22 is configured to be larger in volume than the inlet side, the papermaking raw material containing foreign matters is more in comparison with the structure of the primary chamber 21 described above. It is difficult to dilute, and it is possible to further prevent foreign matter from flowing in through the screen on the outlet side of the papermaking raw material flow in the primary chamber 21 and improve the selection efficiency.

FIG. 1 is a schematic cross-sectional view of a screen device according to an embodiment of the present invention. FIG. 2 is a schematic cross-sectional view taken along line 2-2 of FIG. FIG. 3 is a schematic cross-sectional view taken along line 3-3 in FIG. FIG. 4 is a schematic cross-sectional view of a screen device different from FIG. FIG. 5 is a schematic cross-sectional view taken along line 4-4 of FIG. 6 is a schematic cross-sectional view taken along line 5-5 of FIG.

Explanation of symbols

A ... Screen device 1 ... Tank 2 ... Screen 21 ... Primary chamber 22 ... Secondary chamber 3 ... Stirring member 4 ...・ ・ ・ Papermaking material supply passage 5 ・ ・ ・ ・ ・ Foreign material discharge passage 6 ・ ・ ・ ・ ・ Papermaking material discharge passage

Claims (3)

A tank for receiving papermaking raw materials,
A screen that partitions the tank into a primary chamber and a secondary chamber;
An agitating member that is located outside the screen and agitates the papermaking raw material in the primary chamber;
A papermaking raw material supply passage that communicates with the primary chamber of the tank and supplies the papermaking raw material to the tank;
A foreign matter discharge passage that communicates with the primary chamber and discharges the papermaking raw material containing foreign matter that does not pass through the screen to the outside of the tank;
A papermaking material discharge passage that communicates with the secondary chamber and discharges the papermaking material that has passed through the screen to the outside of the tank;
The space between the screen in the primary chamber and the inner wall of the tank facing the screen is configured such that the downstream side of the papermaking raw material flow in the primary chamber is larger than the upstream side of the papermaking raw material flow. Screen device to play. A tank for receiving papermaking raw materials,
A screen that partitions the tank into a primary chamber and a secondary chamber;
A stirring member that is located inside the screen and that stirs the papermaking raw material in the primary chamber;
A papermaking raw material supply passage that communicates with the primary chamber of the tank and supplies the papermaking raw material to the tank;
A foreign matter discharge passage that communicates with the primary chamber and discharges the papermaking raw material containing foreign matter that does not pass through the screen to the outside of the tank;
A papermaking material discharge passage that communicates with the secondary chamber and discharges the papermaking material that has passed through the screen to the outside of the tank;
The stirring member is attached to the outer peripheral surface of the rotatable rotor part,
The interval between the screen in the primary chamber and the outer peripheral surface of the rotor portion facing the screen is configured such that the downstream side of the papermaking raw material flow in the primary chamber is larger than the upstream side of the papermaking raw material flow. Feature screen device.     The secondary chamber is configured such that the downstream side of the papermaking raw material flow in the secondary chamber is larger than the upstream side of the papermaking raw material flow in the secondary chamber. Item 3. The screen device according to Item 1 or 2.

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