JPH06192982A - Device for macerating and dust removing for papermaking - Google Patents

Abstract

PURPOSE:To improve recovery ratio of useful fibers by effectively carrying out maceration function and dust removing function in good balance for separating useful fibers from foreign substances. CONSTITUTION:A primary dust moving machine 8 equipped with an impeller 6 set in a dust removing chamber 4 and a discharge path 7 for raw material wherein a strainer 2 for separating useful fibers from foreign substances is laid in a closed casing 3, the casing is divided into the dust removing chamber 4 and a raw material recovery chamber 5 and a secondary dust removing machine 18 equipped with a screen basket 12 provided with a hydrofoil rotor 11 in a casing 10 different from that of the primary dust removing machine 8 wherein the case is divided into a finely selecting chamber 13 and the dust moving chamber 14 are arranged in a row, the raw material recovery chamber 5 of the primary dust removing chamber 8 is detachably connected through a communicating passageway 19 to the dust removing chamber 14 of the second dust removing machine 18. Balance between the first dust removal and the second dust removal can be readily changed and recovery ratio of useful fibers can be extremely improved.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a recycled pulp production process,
When disposing of waste paper or waste paper such as newspapers and magazines, disintegrate the disintegrated pieces by disintegrating the disintegrated pieces from the papermaking raw material containing the disintegrated pieces and foreign matters (metal pieces, stones, plastic pieces, styrene pieces, vinyl pieces) The present invention relates to a disintegration and dust removal device for papermaking that is discarded outside.

[0002]

2. Description of the Related Art Generally, in papermaking equipment such as recycled pulp production processing, spoilage paper processing, and waste paper processing, the disintegrated fragments in the raw fiber suspension are disintegrated, and stones, sand, metal fragments, resin In order to remove foreign matter such as pieces and other dust, a screen device is used that is divided into a closed casing with a screen plate having many round holes or slits to partition the screen tail in combination with this screen device. A high-speed disintegrator equipped with an impeller rotating at high speed is known. That is, in the conventional processing system, a machine having a single function such as a round hole screen a, a slit screen b and a high speed disintegrator is generally arranged and used together with a pump d and a chest e as shown in FIG. there were.

[0003]

However, in this conventional processing system, not only the processing system becomes complicated and the equipment cost becomes high, but also an extra pump, chest, etc. are required, and waste of power is increased. I will end up. In order to eliminate such drawbacks, it has been practiced to use a multi-function machine that allows a single machine to perform the three functions of a round hole screen, a slit screen and a high speed disintegrator. However,
When cleaning or replacing the screen basket when the screen is clogged, it is inconvenient and inferior in workability unless the impeller and strainer are removed. In addition, the size of the strainer and screen basket is large. However, there was a problem that the balance of the equipment could not be changed because the design was fixed and the degree of freedom in design was lost. In addition, the disintegration ability of the undisintegrated paper pieces is insufficient, a large amount of undisintegrated paper pieces are included in the reject from the slit, and another disintegration equipment may be required for the reject processing, resulting in high equipment cost. There was also. The present invention is intended to properly eliminate these conventional drawbacks, and it is possible to increase the selective treatment capacity for separating useful fibers and foreign substances, and moreover, the screen basket can be easily washed and replaced, and the safety can be improved. It is easy to use and has a degree of freedom in design, and the balance between primary dust removal and secondary dust removal can be easily changed depending on the amount and nature of undissolved fragments in the raw material, and the recovery of useful fibers should be greatly improved. The purpose is.

[0004]

DISCLOSURE OF THE INVENTION According to the present invention, a strainer consisting of a screen for separating a raw material introduced from a raw material inlet for papermaking into a useful fiber content and a foreign matter content is provided in a hermetically sealed casing to remove dust from the inside of the room. A primary dust remover provided with an impeller rotatably provided in the dust removal treatment chamber in proximity to the strainer and a discharge passage for separated foreign matters, and the primary dust remover By providing a screen basket with a hydrofoil rotor in a casing different from that, partitioning and forming into a selective chamber and a dust removal treatment chamber,
A secondary dust remover provided with a selected raw material outlet in the fine selection chamber and a reject discharge port in the dust removal processing chamber is arranged in parallel, and the secondary raw material recovery chamber of the primary dust remover is connected to the secondary dust collector through a communication flow path. It is a disintegrating and dust removing apparatus for papermaking, characterized in that it is detachably connected and connected to a dust removing processing chamber of a dust remover.

[0005]

The material supplied into the closed casing 3 of the primary dust remover 8 is the impeller 6 which rotates in the vicinity of the strainer 2.
Is disturbed in the primary dust removal processing chamber 4 which is a pretreatment at
The useful fibers are passed from the strainer 2 to flow, and the foreign matters are separated without passing through the strainer 2 and are removed from the discharge passage 9 to the outside of the system for processing. On the side of the primary dust removal processing chamber 4 where the strainer 2 is located, the raw material fed into the processing chamber 4 by the impeller 6 that rotates in close proximity for wiping the screen surface is given swirling and vortex flow in its rotation direction, which accompanies this. Due to the centrifugal force generated, the heavy foreign matter in the raw material is blown to the outer peripheral wall of the processing chamber 4 and falls into the junk box 7, and the light foreign matter is taken out of the system through the discharge passage 9 in the upper center part, while the strainer 2 After passing through the communication flow path 19, the raw material is sent to the secondary dust removal processing chamber 14 and separated by the screen basket 12, and is led out from the selective raw material outlet 15 through the selective chamber 13 and, if necessary, the reject discharge port 16 A part of the rejects discharged from is returned to the raw material inlet 1 in the circulation flow path 28 and is reprocessed. Further, when the raw material concentration sent from the primary dust removal treatment chamber 4 to the secondary dust removal treatment chamber 14 is high, the dilution water is automatically introduced from the dilution water pipe 20 provided in the communication flow path 19, and the secondary dust remover is introduced. Stabilize 18 operations. Further, when cleaning or replacing the screen basket, the upper cover of the closed casing of the secondary dust removal processing chamber can be removed and taken out of the system, and the workability can be greatly improved.

[0006]

EXAMPLE An example of the present invention will be described with reference to the examples of FIGS. 1 to 3. A strainer 2 comprising a screen for separating a raw material introduced from a raw material inlet 1 for papermaking into a useful fiber content and a foreign matter content is shown. It is provided in the closed casing 3, and the interior of the chamber is divided into a dust removal processing chamber 4 and a raw material recovery chamber 5, and the dust removal processing chamber 4 is formed.
A primary dust remover 8 in which an impeller 6 rotatably provided close to the strainer 2 and a discharge passage 7 for separated foreign matter are provided, and a hydrofoil rotor in a casing 10 separate from the primary dust remover 8. A screen basket 12 provided with 11 is provided to partition and form a cleaning chamber 13 and a dust removing treatment chamber 14, a cleaning material outlet 15 is provided in the cleaning chamber 13, and a reject discharge port 16 is provided in the dust removing chamber 14. And a secondary dust remover 18 are arranged in parallel, and the raw material recovery chamber 5 of the primary dust remover 8 is detachably connected and connected to the dust removal processing chamber 14 of the secondary dust remover 18 via the communication flow path 19. A diluting water pipe 20 is provided in the communication flow passage 19, and a pipe connected to the reject discharge port 16 is provided with a circulation flow passage 28 that circulates to the raw material inlet 1 of the primary dust remover 8. As .

The secondary dust remover 18 is composed of a closed casing 10, and a removable upper cover 17 is provided above the screen basket 12 of the closed casing 10 to facilitate cleaning and replacement of the screen basket 12. I am doing it. Further, the primary dust remover 8 and the secondary dust remover 18 are arranged in parallel with a head difference, and a diluting water pipe 20 having an adjusting valve 30 is provided in a connecting flow passage 19 between the two, and a rotor rotating shaft 22 is provided. The detector 29 detects the load applied to the valve and the amount of dilution water is adjusted by the opening degree of the adjusting valve 30 to ensure stable operation.

Further, the primary dust remover 8 is provided with a foreign matter discharge passage 9 in an upper center portion thereof so that light weight foreign matter can be taken out of the system. However, a high speed rotating impeller for disaggregation (Fig. (Not shown) can also be deployed.

In the figure, 21 is an impeller rotating shaft, 22 is a rotor rotating shaft, and 23 and 24 are drive pulleys, which are connected to a motor 25 by belts 26 and 27.

Incidentally, it is effective that a part of the rejects discharged from the reject discharge port 16 of the secondary dust remover 18 is reprocessed by opening the adjusting valve in the circulation passage 28 and returning it to the raw material passage. In this case, the raw material pressure is increased by the pump action generated by the rotation of the hydrofoil rotor 11 in the dust removal processing chamber 14, and it is possible to circulate a part or all of the reject to the primary dust remover 8.
It is also possible to circulate by using a device having a pumping action, whereby the undisintegrated paper pieces being rejected are disintegrated again by the impeller 6 of the primary dust remover 8 and the useful fibers can be recovered. Further, the strainer 2 installed in the closed casing 3 is preferably a round hole strainer, and the screen basket 12 is preferably combined as a slit screen.

[0011]

Industrial Applicability According to the present invention, a strainer comprising a screen for separating a raw material introduced from a papermaking raw material inlet into a useful fiber component and a foreign substance component is provided in a closed casing,
A primary dust remover provided with an impeller rotatably provided close to the strainer in the dust removal treatment chamber and a raw material recovery chamber and having a discharge passage for separated foreign matter, A screen basket equipped with a hydrofoil rotor is provided in a casing separate from the primary dust remover, and is divided into a selective chamber and a dust treatment chamber, and a selective raw material outlet is provided in the selective chamber. A secondary dust remover equipped with a discharge port is arranged in parallel, and the raw material recovery chamber of the primary dust remover is detachably connected to the dust removal processing chamber of the secondary dust remover via a communication flow path, The primary dust remover and the secondary dust remover are standardized by several types, and by appropriately combining them, the balance of the screen equipment can be easily changed, and the selective processing ability to separate useful fibers and foreign substances In addition to being able to increase the number of screens, the screen basket can be easily washed and replaced, and the recovery of useful fibers can be greatly increased. In addition, it is possible to operate safely without causing screen clogging. The system can be simplified and the dust removing device can perform efficient screen work.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of the present invention.

FIG. 2 is a sectional plan view taken along the line AA in the example of FIG.

FIG. 2 is a system diagram of a conventional example.

[Explanation of symbols]

 1 Raw material inlet 2 Strainer 3 Closed casing 4 Dust removal chamber 5 Raw material recovery chamber 6 Impeller 7 Junk box 8 Primary dust remover 9 Foreign matter discharge path 10 Closed casing 11 Hydrofoil rotor 12 Screen basket 13 Selection chamber 14 Dust removal chamber 15 Selected material outlet 16 Reject discharge port 17 Top cover 18 Secondary dust remover 19 Communication flow path 20 Dilution water pipe 28 Circulation flow path 29 Detector 30 Adjustment valve

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[Procedure amendment]

[Submission date] December 2, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of the present invention.

FIG. 2 is a sectional plan view taken along the line AA in the example of FIG.

FIG. 3 is a system diagram of a conventional example.

[Explanation of symbols] 1 raw material inlet 2 strainer 3 closed casing 4 dust removal chamber 5 raw material recovery chamber 6 impeller 7 junk box 8 primary dust remover 9 foreign matter discharge path 10 closed casing 11 hydrofoil rotor 12 screen basket 13 selective chamber 14 dust removal processing Chamber 15 Selected material outlet 16 Reject discharge outlet 17 Upper cover 18 Secondary dust remover 19 Connecting flow passage 20 Diluting water pipe 28 Circulating flow passage 29 Detector 30 Control valve

Claims (4)

[Claims] 1. A strainer comprising a screen for separating a raw material introduced from a papermaking raw material inlet into useful fiber components and foreign matter components is provided in a hermetically sealed casing, and the interior is used as a dust removal treatment chamber and a raw material recovery chamber. And an impeller rotatably provided in the dust removal processing chamber in the vicinity of the strainer.
A primary dust remover provided with a discharge path for the separated foreign matter, and a screen basket provided with a hydrofoil rotor in a casing different from the primary dust remover, are formed in a selective chamber and a dust removal treatment chamber, A secondary dust remover provided with a selected raw material outlet in the fine selection chamber and a reject discharge port in the dust removal processing chamber is arranged in parallel, and the secondary raw material recovery chamber of the primary dust remover is connected to the secondary dust collector through a communication flow path. A disintegrating and dust removing device for paper making, which is detachably connected to the dust removing processing chamber of the dust remover. 2. The disintegrating and dust removing apparatus for papermaking according to claim 1, wherein the secondary dust remover is a closed casing, and a removable upper cover is provided above the screen basket of the closed casing. 3. The disintegrator for papermaking according to claim 1 or 2, wherein the primary dust remover and the secondary dust remover are arranged in parallel with a head difference, and a diluting water pipe is provided in a communication passage between the two. Combined dust remover. 4. The disintegrating and dust removing apparatus for papermaking according to claim 1, wherein the secondary dust remover is provided with a circulation path circulating in the pipe connected to the reject discharge port to the primary dust remover.