JPS62268892A - 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 paper stock disintegration screen for separating paper stock into paper stock and foreign matter to obtain a selected paper 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 rotary drive shaft via an adjusting nut in the axial direction with the 'tJs adjusting nut, the gap between the rotating detachment and fixed detachment can be adjusted. The pressure is adjusted for the primary disintegration and secondary disintegration, but such pressure adjustment is extremely difficult, and the problem is that it is impossible to obtain sufficient pressure on the paper stock on the secondary disintegration side. There was a point.

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 has the above-mentioned paper stock disintegrating screen on the paper stock passing side of the primary screen member that allows the primary disintegrating paper stock separated from foreign matter to pass through by the rotation of an impeller in the primary disintegration chamber into which papermaking raw materials are injected under pressure. A pump blade is provided which is driven to rotate coaxially with the impeller, and the paper stock passing through the primary screen member is forcibly fed into the secondary screen member by the rotational centrifugal force of the pump blade.

The paper stock disintegrating screen according to the second invention is provided with a pump blade which is driven to rotate coaxially with the impeller on the stock passing side of the primary screen member, and which rotates in the direction of the inner circumferential surface of the secondary screen member. Driven scrapers are integrally connected, and the paper stock passing through the primary screen member is forcibly passed from the inside to the outside of the secondary screen member by the rotating centrifugal force of the pump blade, so that the internal pressure separation type structure is adopted.

The paper stock disintegrating screen according to the third invention has a pump blade which is coaxially driven to rotate with the impeller arranged on the paper stock passing side of the primary screen member, and the pump blade is rotationally driven in the direction of the outer circumferential surface of the secondary screen member. This is an external pressure separation type structure in which the paper stock passing through the primary screen member is forced to pass from the outside to the inside of the secondary screen member by the rotating centrifugal force of the pump blade.

[Effect]

In the paper stock disintegration screen of the first invention, the papermaking raw material injected under pressure 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 transferred to the pump impeller. By applying pressure to the secondary screen member and feeding it to the secondary screen member, sufficient screen pressure can be obtained in both the primary screen member and the secondary screen member, and the primary disintegration and secondary disintegration of the paper stock can be carried out. It is carried out smoothly and reliably.

In the paper stock disintegration screen of the second invention, the paper stock that has passed through the primary screen member is secondarily pressurized by the pump blade and is forced into the secondary screen member, and the paper stock that has passed through the primary screen member is pressurized by the pump blade and is forced into the secondary screen member. The scraper integrated with the pump blade is rotated in the direction of the inner circumferential surface of the secondary screen member.
This prevents clogging of the secondary screen member.

In the paper stock disintegrating screen of the third invention, the paper stock that has passed through the primary screen member is secondarily pressurized by the pump vane and is force-fed to the secondary screen member. At the same time, the scraper integrated with the pump blade is rotated in the direction of the outer peripheral surface of the secondary screen member, thereby preventing clogging of the secondary screen member.

〔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 II-If of FIG. 1,
Figure 3 is a sectional view taken along line mm in Figure 1, and Figure 4 is a cross-sectional view taken along line I in Figure 1.
It is a sectional view taken along the line V-IV.

In FIG. 1, reference numeral 1 denotes a housing for a paper stock disintegrating screen, and this housing 1 is made up of first to fifth stage housing members IA to IE that are sequentially assembled and disassembled upward. There is.

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

This primary disintegration chamber 2 has a raw material inlet 3 on the negative side.

A heavy foreign matter outlet 4 on the other side and a light foreign matter outlet 5 on the top are provided respectively.

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 10 are provided at regular intervals as shown in the second figure.

The fourth stage housing member ID is formed with an annular primary selected stock chamber 11 that is open on the inside along its inner peripheral surface, and this primary selected stock chamber 11 is provided with a dilution water inlet 11a. ing.

A pump blade 12 located near the bottom of the primary screen member 9 and connected to the rotating shaft 6 is housed within the housing member ID.

Here, after removing the fifth stage housing member IE from the fourth stage housing member ID, remove the tightening nut 7, and then remove the fourth stage housing member ID from the third stage housing member ID.
By removing the pump blade 12 from the housing member IC of the second stage, the pump blade 12 can be replaced with another pump blade with a different size and performance.

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

A hollow cylindrical secondary screen member 17 is housed in the secondary disintegrating chamber 16, and this secondary screen member 17 is connected to the inner circumferential surface of the secondary disintegrating chamber 16 in an annular secondary selected stock chamber. 1
8 is formed.

The secondary disintegration chamber 16 is provided with a stock outlet 19 that communicates with the secondary selected stock chamber 18 .

Further, inside the secondary screen member 17, a pump blade 12 is provided.
A scraper 21 that is integrally connected and hangs down is housed in the lower part of the housing.

As shown in FIG.
1a, and this wing portion 2La has a streamlined shape in which the width of 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 has a bearing cylinder portion 1b,
The rotary shaft 6 is rotatably supported within the bearing cylinder portion 1b via bearing members such as a mechanical seal 13, an oil seal 14, and a bearing 15.

Further, the second stage housing member IB is provided with a reject outlet 20 that communicates with the inside of the secondary screen member 17, and the bearing cylinder portion 1b is provided with a seal water inlet 13a that communicates with the mechanical seal 13. There is.

On the other hand, the lower end of the rotating shaft 6 is connected to a pulley 27, a transmission belt 28. It is interlocked with an electric motor at 3° via a pulley 29.

Therefore, by rotationally driving the rotary shaft 6 by the electric motor 3o, the impeller 8, the pump blades 12, and the scraper 21 are each rotated in synchronization with the rotary shaft 6.

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 stock passes through the primary screen member 9 and is splashed into the secondary selected stock chamber 11 by the rotational centrifugal force of the pump blade 12, causing a swirling flow within the primary selected stock chamber 11. , and the dilution water injected under pressure from the dilution water inlet 11a is mixed in, and is forcibly pressurized secondary by the pressurizing force of this dilution water and the centrifugal force of the rotation of the pump blade 12. It is forcibly fed into the screen member 17.

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.

Here, the scraper 2 rotates together with the pump blade 12.
The vibration effect of No. 1 prevents the secondary screen member 17 from clogging.

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

FIG. 5 shows a second embodiment. In this second embodiment, an annular foreign matter separation chamber 18a is formed between the inner circumferential surface of the secondary disintegration chamber 16 and the secondary screen member 17. A reject outlet 20 is provided at the lower part of the separation chamber 18a, and communicates with the inner bottom of the secondary screen member 17 to form a stock outlet 19.
is provided.

A scraper 21 integrated with the pump blade 12 is arranged so as to be rotationally driven along the outer peripheral surface of the secondary screen member 17 in a tangential direction thereof.

Therefore, in this embodiment, the paper stock, which has been separated from foreign matter by the impeller 8 and passed through the secondary screen member 9, is forcibly fed into the foreign matter separation chamber 18a by the centrifugal force of the rotation of the pump blades 12, and this foreign matter separation chamber 18a is Secondary screen member 1 inside
The paper stock passes from the outside to the inside of the paper stock 7, and this paper stock becomes purified paper stock from which foreign substances are separated and is discharged from the paper stock outlet 19.

On the other hand, the foreign matter separated from the stock in the foreign matter separation chamber 18a is discharged to the outside of the system from the paste outlet 20 at the bottom of the foreign matter separation chamber 18a.

In the first and second embodiments described above, a concentration sensor (not shown) for the paper stock that is forcibly fed to the secondary screen member 17 is provided, and the electric motor 3o is activated by a sensor output signal corresponding to the detected concentration by this concentration sensor. may be automatically controlled to obtain a forced pressure suitable for the paper stock.

〔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 by the rotational centrifugal force of the pump blades and is sent to the secondary screen member.
Screen pressure suitable for primary and secondary disintegration can be obtained,
Therefore, clogging of the screen is prevented, and the primary disintegration and secondary disintegration of the paper stock can be carried out smoothly and reliably.

High quality purified paper stock can be obtained efficiently.

[Brief explanation of 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.
A sectional view taken along line IV and FIG. 5 are longitudinal sectional views of a paper stock disintegrating screen according to a second embodiment. In the figure, 2 is the primary disintegration chamber, and 3 is the raw material inlet. 4.5 is a foreign matter outlet, 8 is an impeller, 9 is a secondary screen member, 12 is a pump blade, 16 is a secondary disintegration chamber, 17 is a secondary screen member, and 21 is a scraper. In addition, in FIG. 1, the same reference numerals indicate the same or corresponding parts. Figure 2 Procedural amendment (method)

Claims (4)

[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 stock disintegration screen, a pump blade that is driven to rotate coaxially with the impeller is provided on the stock passing side of the primary screen member, and the centrifugal force of rotation of the pump blade causes the stock passing through the primary screen member to pass through the secondary screen. A paper stock disintegration screen characterized in that it is forcibly fed into a member. (2) A pump blade arranged on the stock passing side of the primary screen member and driven to rotate coaxially with the impeller, and a scraper integrally connected to the pump blade and driven to rotate in the direction of the inner peripheral surface of the secondary screen member. A paper stock disintegration screen comprising: an internal pressure separation type structure in which the stock passing through the primary screen member is forcibly passed from the inside to the outside of the secondary screen member by the rotational centrifugal force of the pump blade. (3) A patent claim characterized in that an annular swirl path is provided at a position corresponding to the peripheral edge of the pump blade, which generates a paper swirl flow due to the centrifugal force of the pump blade and communicates with the inside of the secondary screen member. A paper stock disintegrating screen according to item 1. (4) A pump blade arranged on the stock passing side of the primary screen member and driven to rotate coaxially with the impeller, and a scraper integrally connected to the pump blade and driven to rotate in the direction of the outer peripheral surface of the secondary screen member. A paper stock disintegrating screen comprising: an external pressure separation type structure in which the stock passing through the primary screen member is forced to pass from the outside to the inside of the secondary screen member by the rotational centrifugal force of the pump blade.