JPS62268891A - Paper stock beating screen - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] This invention relates to a stock disintegration screen for separating papermaking raw materials into stock and foreign matter to obtain a selected stock.

[Conventional technology]

As a conventional screen of this kind, for example, Japanese Patent Application Laid-Open No. 58
There is a disaggregation screen shown in Japanese Patent No. 203196.

This disintegration screen supplies the papermaking raw material under pressure to a gap between a wing-shaped rotary disintegration machine and a stationary disintegration machine that is close to and spaced apart from the rotary disintegration machine, and allows the papermaking raw material to pass through the gap. Primary disintegration is carried out, and then the paper stock that has passed through the gap is allowed to flow down and sent into the cylindrical screen member below the above-mentioned pre-rotation disintegration, and secondary disintegration is performed in this cylindrical screen member to produce selected paper stock. It is configured to obtain

[Problem that the invention seeks to solve]

In such a conventional disintegration screen, the paper stock is fed into the cylindrical screen member on the secondary disintegration side only by the primary pressurizing force of the papermaking raw material against the gap between the rotary disintegration and the fixed disintegration. There is a problem in that the pressure applied to the paper stock to the cylindrical screen member is reduced, which causes the cylindrical screen member to become clogged, making it impossible to smoothly perform the primary disintegration and secondary disintegration.

Therefore, by moving the rotating detachment connected to the one-turn drive shaft via an adjustment nut in the axial direction with the #4 adjusting nut, the gap between the rotation detachment and fixed detachment can be adjusted. Pressure adjustment is carried out for primary and secondary disintegration, but such pressure adjustment is extremely difficult, and there is a problem in that it is not possible to obtain sufficient stock pressure on the secondary disintegration side. Ta.

This invention was made to solve the above-mentioned problems, and it is possible to smoothly, reliably and efficiently carry out the primary disintegration and secondary disintegration of papermaking raw materials, and to obtain high quality selected paper stock. Intended as a free disassembly screen.

[Means for solving problems]

The paper stock disintegrating screen according to the first invention includes a paper stock passing side of a primary screen member that passes through the primary disintegrating paper stock separated from foreign substances by the rotation of an impeller in a primary disintegration chamber into which papermaking raw materials are injected under pressure. A paper stock pressure feeding means is connected to the secondary disintegrating chamber through a paper stock pressurized conduit, and pressurizes the stock passing through the primary screen member to the secondary disintegrating chamber via the stock pressurized conduit. It is something.

The paper stock disintegration screen according to the second invention has a cylindrical shape that forms a selected paper stock chamber between the end of the stock pressure feed pipe on the secondary disintegration chamber side and the inner circumferential surface of the secondary disintegration chamber. The paper is connected to the inside of a secondary screen member, and has an internal pressure separation type structure in which the selected stock is separated inside the secondary screen member.

[Effect]

In the paper stock disintegration screen of the first invention, the paper stock that is pressurized and injected into the primary disintegration chamber is separated into foreign matter and paper stock by the rotation of the impeller, and the paper stock that has passed through the primary screen member is separated from the paper stock by the rotation of the impeller. The paper stock is forced to be fed to the secondary screen member in the secondary disintegration chamber through the paper stock pressure feed pipe line by the secondary pressurizing force of the pressurized feeding means, so that the paper stock is Sufficient pressurizing force is obtained, the screen members are prevented from clogging, and primary disintegration and secondary disintegration are carried out smoothly and reliably.

In the stock disintegration screen of the second invention, the stock that has passed through the primary screen member is forced into the secondary screen member via the stock pressure feed pipe by the secondary pressurizing force by the stock pressure feeding means. The liquid is then pumped through this secondary screen member from the inside to the outside.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 1 is a longitudinal sectional view of a paper stock disintegrating screen according to a first embodiment of the present invention, FIG. 2 is a sectional view taken along the line ■-■ in FIG. 1, and FIG.
The figure is a sectional view taken along the line ■-■ in Figure 1, and Figure 4 is a cross-sectional view taken along the line IV-■ in Figure 1.
4V line sectional view.

In FIG. 1, 1 is a housing for a paper stock disintegration screen, and this housing 1 is made up of first to sixth stage housing members IA to IF that are assembled upward in sequence so that they can be assembled and disassembled. There is.

Among these housing members IA to IF, the sixth stage housing member IF located at the top has a closed shape and forms a primary disintegration chamber 2 .

This primary disintegration chamber 2 is provided with a raw material population 3 on the minus side, a heavy foreign matter outlet 4 on the other side, and a light foreign matter outlet 5 on the top.

In the lower part of the primary disintegration chamber 2, an impeller 8 is disposed, which is tightened and connected to the upper end of the rotating shaft 6 with a tightening nut 7.
A primary screen member 9 made of a perforated plate is arranged near the bottom of the impeller 8 .

On the upper surface of the peripheral edge of the primary screen member 9, a plurality of receiving blades 1o are provided at regular intervals as shown in the second figure.

Furthermore, a primary selection stock chamber 11 is formed below the primary screen member 9 by the fifth stage housing member IE.

The primary selected paper stock chamber 11 has a dilution water inlet 11a and a stock pressure outlet 11b, and inside the primary selected paper stock chamber 11,
A stock pressurizing and feeding means 12 is housed for forcibly feeding the paper stock passing through the primary screen member 9 to a secondary defibration side which will be described later.

The stock pressurizing feeding means 12 of this embodiment comprises a pump blade 12 which is collinear with the impeller 8 on the rotary shaft 6 through the tightening nut 7.

This pump blade 12 is connected to the sixth stage housing member IF.
After removing from the fifth stage housing member IE, the tightening nut 7 is removed, and then the fifth stage housing member IE is removed from the fourth stage housing member ID to increase the size (performance). It can be replaced with a different pump vane.

The fourth stage housing member ID forms an upper bearing chamber for the rotating shaft 6, and rotatably supports the rotating shaft 6 through bearing members such as a gland packing 13, an oil seal 14, and a bearing 15. There is.

The third stage housing member IC forms a secondary defibration chamber 16.

A hollow cylindrical secondary screen member 17 is housed in the secondary disintegration chamber 16, and this secondary screen member 17 is arranged between the inner peripheral surface of the secondary disintegration chamber 16 and the annular secondary side selected paper material. A chamber 18 is formed.

The secondary disintegrating chamber 16 is provided with a stock outlet 19 communicating with the secondary selected stock chamber 18 and a reject outlet 2o communicating with the inside of the secondary screen member 17.

Further, a scraper 21 is housed in the secondary screen member 17 and is attached to the rotating shaft 6 and rotationally driven in the direction of the inner circumferential surface of the secondary screen member 17.

As shown in FIG.
1a, the wing portion 21a has a streamlined shape in which the gap with the inner circumferential surface of the secondary screen member 17 is gradually narrowed toward the rotation direction side, and its own wall thickness gradually becomes wider toward the rotation direction side. is formed.

The scraper 21 causes a vibration effect between the scraper 21 and the inner peripheral surface of the secondary screen member 17 by the wing portion 21a when driven to rotate, and this vibration effect prevents the secondary screen member 17 from clogging.

The second stage housing member IB includes a secondary defibration side stock introduction port 22 that communicates with the inner bottom of the secondary screen member 17;
A lower bearing chamber 23 is formed, and a gland packing 24, an oil seal 25, and a bearing 26 are installed in this lower bearing chamber 23.
The lower end side of the rotary shaft 6 is rotatably supported through a bearing member such as the rotary shaft 6.

The lower end of the rotating shaft 6 is interlocked with an electric motor 30 via a pulley 27, a transmission belt 28, and a pulley 29.

Therefore, by rotationally driving the rotary shaft 6 by the electric motor 30, the impeller 8, the pump blades 12, and the scraper 21 are each rotated in synchronization with the rotary shaft 6.

Then, the paper stock pressurized outlet 11b of the primary selected paper stock chamber 11
and the above-mentioned secondary disintegration side paper stock introduction port 22 are connected to the paper stock pressure feeding pipe 31
connected with.

Next, the operation of the above embodiment will be explained. When the electric motor 30 is activated, papermaking raw materials are injected under pressure into the primary disintegration chamber 2 from the raw material inlet 3, and the papermaking raw materials are swirled by the impeller 8 and separated into foreign matter and paper stock. At this time, due to the internal pressure of the primary disintegration chamber 2 and the swirling pressure of the impeller 8, the heavy foreign matter is discharged from the heavy foreign matter outlet 4, and the light foreign matter is discharged from the light foreign matter outlet 5.

On the other hand, the above-mentioned stock passes through the primary screen member 9 and flows into the primary selected stock chamber 11, and is mixed with dilution water injected under pressure from the dilution water inlet 11a. , by being secondarily forcibly pressurized by the rotational centrifugal force of the pump blades 12.

The paper stock is forcibly fed into the secondary screen member 17 from the secondary disintegration side paper stock introduction port 22 via the paper stock pressure feeding conduit 31 .

The paper stock forcibly fed into the secondary screen member 17 passes through this secondary screen member 17 and flows into the secondary side selected stock chamber 18, thereby becoming selected stock at the stock outlet 19. is discharged from.

On the other hand, foreign matter separated within the secondary screen member 17 is discharged from the eject outlet 20 .

In the above embodiment, the paper stock pressurized feeding means 12 is either a pump P (see FIG. 1) provided in the middle of the paper stock pressure feeding pipe line 3 instead of the pump blade 12, or a paper stock pressure feeding pipe. Dilution water pressurized supply means 12a connected to the middle part of the path 31 and into which dilution water is injected under pressure, or this dilution water pressurized supply means 12
A and the pump blade 12 may be combined to obtain an appropriate pressing force of the paper stock against the secondary screen member 17. In addition, a concentration sensor (not shown) for the paper stock to be forcibly fed into the paper stock pressure feeding pipe line 31 is provided, and the electric motor 30 is automatically controlled by a sensor output signal according to the detected concentration by this density sensor. It may also be possible to obtain a forced pressing force suitable for.

〔Effect of the invention〕

As described above, according to the present invention, the paper stock that has passed through the primary screen member is secondarily forcibly pressurized, is forced through the paper stock pressure-feeding conduit, and is fed into the secondary screen member, thereby allowing the paper stock to undergo primary disintegration. The screen pressure suitable for secondary disintegration can be obtained, and as a result, clogging of the screen is prevented, and the primary disintegration and secondary disintegration of paper stock can be carried out smoothly and reliably, resulting in high-quality processing. Paper stock can be obtained efficiently.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of the paper stock disintegrating screen according to the present invention, FIG. 2 is a cross-sectional view taken along the line ■-■ in FIG. 1, FIG. 3 is a cross-sectional view taken along the ■-■ line in FIG. 1, and FIG. is a sectional view taken along the line IV-IV in FIG. 1; In the figure, 2 is a primary disintegration chamber, 3 is a raw material inlet, 4.5 is a foreign matter outlet, 8 is an impeller, 9 is a primary screen member, 1
Reference numeral 2 denotes a paper stock pressure feeding means, 16 a secondary disintegration chamber, 17 a secondary screen member, and 31 a paper stock pressure feeding conduit. In addition, in the figures, the same reference numerals indicate the same or corresponding parts. Patent Applicant: Fuji General Equipment Co., Ltd. Figure 4 Procedure Correction Band (Method) % Formula % 1, Case Indication Patent Application No. 112071/1988 2,
Name of the invention: Paper disintegration screen 3, Name of the person making the amendment: Fuji General Equipment Co., Ltd. 5: Date of the amendment order: July 29, 1985 6: Subject of the amendment: (1) Power of attorney (2) Application form (3) Description (4) Drawing 7, Contents of amendment (1) The power of attorney will be supplemented as shown in the attached sheet. (2) Engraving of application (no change in content) (3) Engraving of specification (no change in content) (4) Engraving of drawings (no change in content) Procedural amendment band (voluntary)

Claims (7)

[Claims] (1) The papermaking raw material injected under pressure from the raw material inlet into a primary disintegration chamber having a papermaking raw material inlet and a foreign matter outlet is first disintegrated into paper stock and foreign matter by an impeller, and the foreign matter is discharged from the foreign matter outlet. At the same time, the paper stock passes through a primary screen member at a position corresponding to the impeller and is fed into a secondary disintegration chamber, and the secondary screen member in the secondary disintegration chamber performs secondary disintegration to separate the selected paper stock and foreign substances. In the paper stock disintegration screen, the stock passing side of the primary screen member is connected to the secondary disintegration chamber by a stock pressure feed conduit, and the stock passing through the primary screen member is passed through the stock pressure feed conduit. A paper stock disintegration screen characterized by comprising a paper stock pressurized feeding means for forcibly feeding the paper stock to the secondary disintegration chamber. (2) The paper stock passing side of the primary screen member, which passes the primary defibrated stock separated from foreign substances by the rotation of the impeller in the primary disintegration chamber, is connected to the secondary disintegration chamber through a stock pressure feed pipe, and this paper stock In a stock disintegration screen equipped with a stock pressure feeding means for forcibly feeding the stock passing through the primary screen member to the secondary disintegration chamber via a conduit, a The end portion is connected to the inside of a cylindrical secondary screen member that forms a selected paper stock chamber with the inner peripheral surface of the secondary disintegration chamber, and the selected stock is separated inside this secondary screen member. A paper stock disintegration screen characterized by having an internal pressure separation type configuration. (3) The stock pressurized feeding means is comprised of an exchangeable pump blade arranged on the stock passing side of the primary screen member and driven to rotate coaxially with the impeller. The paper stock disintegrating screen according to item 1 or 2. (4) The paper stock disintegration screen according to claim 1 or 2, wherein the paper stock pressurized feeding means is comprised of a pump provided in the middle of the paper stock pressure feeding pipeline. . (5) The paper stock pressurized feeding means comprises dilution water pressurized supply means for injecting dilution water under pressure into the paper stock pressure feeding pipeline, as claimed in claim 1 or 2. Paper stock disintegration screen as described. (6) The stock pressurized feeding means includes a pump blade arranged on the paper stock passing side of the primary screen member and driven to rotate coaxially with the impeller, and a dilution water adder that injects dilution water under pressure into the paper stock pressure feed pipe. A paper stock disintegrating screen according to claim 1 or 2, characterized in that it is combined with a pressure supply means. (7) The paper stock disintegrating screen according to claim 1 or 2, wherein the secondary screen member is provided with a scraper that is rotationally driven in the direction of the inner surface of the secondary screen member.