JPH0433915B2 - - Google Patents

Description

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

[Conventional technology]

As a conventional screen of this type, there is, for example, a disaggregation screen disclosed in Japanese Patent Application Laid-Open No. 58-203196.

This disintegration screen is constructed by supplying the paper material under pressure to the gap between a wing-shaped rotary disintegrator and a stationary disintegrator disposed close to and spaced from the rotary disintegrator, and allowing the material to pass through the gap. The paper stock is subjected to primary disintegration, and then the paper stock that has passed through the gap is allowed to flow down and sent to the cylindrical screen member below the rotary disintegration, where it is subjected to secondary disintegration and carefully selected. It is structured to obtain paper stock.

[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 was a problem in that the supply pressure of the stock to the cylindrical screen member was reduced, which caused the cylindrical screen member to become clogged, making it impossible to smoothly perform primary and secondary disintegration.

Therefore, by moving the rotary debonding member connected to the rotary drive shaft via an adjustment nut in the axial direction with the adjustment nut, the gap between the rotary debonding member and the stationary debonding member is adjusted and the primary disintegration is performed. However, such pressure adjustment is extremely difficult and there is a problem in that it is not possible to obtain sufficient pressure on the paper stock on the secondary disintegration side.

This invention was made to solve the above-mentioned problems, and it is a paper that can smoothly, reliably and efficiently perform the primary separation and secondary separation of papermaking raw materials to obtain high-quality selected paper stock. Aimed at composite screens.

[Means to solve the problem]

The paper stock composite screen according to the present invention has a stock passing side of a primary screen member that passes through the primary separated stock that has been separated from foreign matter by the rotation of an impeller in a primary separation chamber into which papermaking raw materials are injected under pressure, and a secondary The inside of the hollow cylindrical secondary screen member in the separation chamber is connected by a paper stock pressure feed line, and the dilution is connected to a pump blade that is coaxially driven with the impeller provided on the stock passing side of the primary screen member. The paper stock passing through the primary screen member is forcibly fed to the inside of the secondary screen member through the stock pressure feeding conduit by dilution water injected under pressure from the water inlet, A scraper provided inside the screen member and driven to rotate coaxially with the pump blade is provided with a wing portion that generates vibrations in the secondary screen member when the scraper is driven to rotate.

[Effect]

In the paper material composite screen of this invention,
The papermaking raw material injected under pressure into the primary separation chamber is separated into foreign matter and paper stock by the rotation of the impeller, and the paper stock passes through the primary screen member. The paper stock that has passed through the primary screen member is immediately processed into paper by the combined force of the rotational centrifugal force of the pump blades, which are driven to rotate coaxially with the impeller, and the pressurizing force of the dilution water injected under pressure from the dilution water inlet. The raw material is forcibly fed to the inside of the secondary screen member in the secondary separation chamber through the feed line. Moreover, at this time, the paper stock that is forcibly fed through the paper stock pressure feed line is forcibly fed inside the secondary screen member in a diluted state with dilution water. The paper stock thus forcibly fed is forced to pass through the secondary screen member from the inside to the outside. Therefore, the combined force of the pump blades and the dilution water injected under pressure prevents clogging of the primary screen member due to stock accumulation on the stock passing side of the primary screen member, and also prevents clogging of the primary screen member. Next, the amount of pressurized paper stock passing through the screen member is sufficiently increased. Furthermore, the blades of the scraper that are rotatably driven inside the secondary screen member generate vibrations in the secondary screen member, and the vibration effect prevents clogging of the secondary screen member. The paper stock that is forcibly fed into the inside of the secondary screen member in a diluted state can pass smoothly from the inside to the outside 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 cross-sectional view of a paper stock composite screen according to a first embodiment of the present invention, FIG. 2 is a cross-sectional view taken along the line -- in FIG. 1, and FIG. FIG. 4 is a sectional view taken along the - line in FIG. 1.

In FIG. 1, reference numeral 1 denotes a housing of a paper material composite screen, and this housing 1 is made up of first to sixth housing members 1A to 1F that are assembled and disassembled sequentially upward. ing.

In these housing members 1A to 1F,
Housing member 1F of the 6th stage located at the top
forms a primary separation chamber 2 with a lid.

This primary separation chamber 2 includes a raw material inlet 3 on one 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 separation chamber 2, there is disposed an impeller 8 which is tightened and connected to the upper end of the rotating shaft 6 with a tightening nut 7, and a primary screen made of an effective plate is located near the lower part of the impeller 8. Part 9
is located.

On the upper surface of the peripheral edge of the primary screen member 9, a second
As shown in the figure, a plurality of receiving blades 10 are provided at regular intervals.

Further, a fifth screen is provided at the bottom of the primary screen member 9.
A primary selection stock chamber 11 is formed by the housing member 1E of the first stage.

The primary selected stock chamber 11 has a dilution water inlet 11a and a stock pressure outlet 11b. A pressure feeding means 12 for forcibly feeding paper stock is housed therein.

The stock pressure feeding means 12 of this embodiment consists of a pump blade 12 which is fastened together with the impeller 8 to the rotating shaft 6 by the tightening nut 7.

This pump blade 12 is manufactured by removing the tightening nut 7 after removing the sixth stage housing member 1F from the fifth stage housing member 1E.
By removing the fifth stage housing member 1E from the fourth stage housing member 1D, it can be replaced with another pump blade having a different size (performance).

The fourth stage housing member 1D forms the upper bearing chamber of the rotating shaft 6, and the gland packing 1D
3. The rotary shaft 6 is rotatably supported via bearing members such as an oil seal 14 and a bearing 15.

The third stage housing member 1C is the secondary separation chamber 1
6 is formed.

A hollow cylindrical secondary screen member 17 is housed in the secondary separation chamber 16, and this secondary screen member 17 is connected to the secondary separation chamber 16 with an annular secondary side selected paper material between the inner peripheral surface and the secondary screen member 17. A chamber 18 is formed.

The secondary separation chamber 16 is provided with a stock outlet 19 communicating with the secondary selected stock chamber 18 and a reject outlet 20 communicating with the inside of the secondary screen member 17.

Further, inside the secondary screen member 17, a secondary screen member 1 attached to the rotating shaft 6 is provided.
A scraper 21 that is rotatably driven in the direction of the inner circumferential surface of No. 7 is housed.

As shown in the fourth figure, this scraper 21 has a wing section 21a that is rotatably driven in the direction of the inner circumferential surface of the secondary screen member 17, and this wing section 21a has a
It is formed into a streamlined shape in which the gap between it and the inner circumferential surface of the secondary screen member 17 gradually narrows in the direction of rotation, and its thickness gradually increases in the direction of rotation.

Such a scraper 21 has a blade portion 2 during rotational driving.
1a causes a vibration effect between the secondary screen member 17 and the inner circumferential surface of the secondary screen member 17, and this vibration effect prevents the secondary screen member 17 from clogging.

The second stage housing member 1B has a secondary separation side stock introduction port 22 communicating with the inner bottom of the secondary screen member 17 and a lower bearing chamber 23. The lower end side of the rotating shaft 6 is rotatably supported through bearing members such as the oil seal 25 and the bearing 2.

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, when the rotating shaft 6 is rotationally driven by the electric motor 30, the impeller 8 and the pump blades 12 are rotated.
and the scraper 21 are connected to the rotating shaft 6.
and are rotated synchronously.

The paper stock pressure feeding port 11b of the primary selection paper stock chamber 11 and the paper stock introduction port 22 on the secondary separation side are connected by a paper stock pressure feeding pipe 31.

Next, the operation of the above embodiment will be explained. Electric motor 3
When the papermaking raw material is pressurized and injected into the primary separation chamber 2 from the raw material inlet 3 in the starting state of 0, the papermaking raw material is swirled by the impeller 8 and separated into foreign matter and paper stock. At this time, due to the internal pressure of the primary separation 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 paper stock introduction port 22 on the secondary separation side via the paper stock pressure feeding conduit 31 .

The paper stock forcibly fed into the secondary screen member 17 passes through the secondary screen member 17 and flows into the secondary 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 reject outlet 20.

Therefore, the paper stock that has passed through the primary screen member 9 is immediately subjected to secondary separation by the combined force of the pump blade 12, which is driven to rotate coaxially with the impeller 8, and the dilution water injected under pressure from the dilution water inlet 11a. room 16
The primary screen member 9
In addition to preventing clogging of the primary screen section 9 due to accumulation of paper stock on the paper stock passage side, the pressurizing force of the paper stock against the secondary screen member 17 in the secondary separation chamber 16 is sufficiently increased. This also prevents the secondary screen member 17 from clogging. Moreover, the paper stock forcibly fed through the paper stock pressure feeding pipe 31 is forcibly fed into the secondary screen member 17 in a diluted state with dilution water, so that the blade portion 21a of the scraper 21 can be forcibly fed as described above. Coupled with the fact that vibration is generated in the secondary screen member 17 by this, the diluted paper stock can pass smoothly from the inside to the outside of the secondary screen member.

Incidentally, if a pump P for pressurizing the paper stock (see Fig. 1) and a pressurized dilution water supply means 12a (see Fig. 1) for injecting dilution water under pressure are provided in the middle of the paper stock pressure feeding pipeline 11. , it is possible to further increase the pressurized passing force of the paper stock to the secondary screen member 17, and also increase the passing force of the paper stock to the primary screen member 9 due to the suction effect of negative pressure. Next, clogging of the screen member 17 can be further prevented. In addition, a concentration sensor (not shown) for the paper stock that is forcibly fed to the paper stock pressure feeding pipe line 31 is provided, and the electric motor 30 is automatically controlled by a sensor output signal corresponding to the detected density by this density sensor. , a forced pressure suitable for the paper stock may be obtained.

〔Effect of the invention〕

As described above, according to the present invention, the paper stock that has passed through the primary screen member is processed by the combined force of the rotational centrifugal force of the pump blades and the pressurizing force of the dilution water injected under pressure from the dilution water inlet. Immediately, by force-feeding the stock to the inside of the secondary screen member in the secondary separation chamber through the stock pressure-feeding conduit, the stock is deposited on the stock passing side of the primary screen member, thereby reducing the amount of the primary screen member. In addition to preventing clogging, it is possible to sufficiently increase the pressure passing force of the paper stock to the secondary screen member,
In addition, the paper stock that is forcibly fed through the paper stock pressure feeding pipe is forcibly fed inside the secondary screen member in a diluted state with dilution water, and the stock is rotated inside the secondary screen member. The blades of the scraper generate a vibration effect on the secondary screen member to prevent clogging of the secondary screen member, and the paper stock diluted with the dilution water is Since it is possible to pass smoothly from the inside to the outside of the secondary screen member, it is possible to prevent clogging of both the primary screen member and the secondary screen member, and the paper material for the primary screen member and the secondary screen member can be prevented from clogging. The primary separation and secondary separation of the stock can be performed smoothly and reliably by passing through the paper stock, and high quality refined paper stock can be efficiently obtained.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view of a paper material composite screen according to the present invention, FIG. 2 is a cross-sectional view taken along the line -- in FIG.
Figure 3 is a sectional view taken along the - line in Figure 1, and Figure 4 is a cross-sectional view of Figure 1.
It is a sectional view taken along the - line in the figure. In the figure, 2 is the primary separation chamber, 3 is the raw material inlet,
4 and 5 are foreign matter outlets, 8 is an impeller, 9 is a primary screen member, 11a is a dilution water inlet, 12 is a pump blade that is a means for pressurizing and supplying paper stock, 16 is a secondary separation chamber, 17 is a secondary screen member, 31 is a paper stock pressure feed line. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] 1 The papermaking raw material injected under pressure from the raw material inlet into a primary separation chamber having a papermaking raw material inlet and a foreign matter outlet is primarily separated into paper stock and foreign matter by an impeller, and the foreign matter is discharged from the foreign matter outlet. , the paper stock passes through a primary screen member at a position corresponding to the impeller and is fed into a secondary separation chamber;
In this paper stock composite type screen that performs secondary separation into selected paper stock and foreign matter using a secondary screen member in the secondary separation chamber, a hollow cylindrical screen is provided between the paper stock passing side of the primary screen member and the hollow cylindrical screen in the secondary separation chamber. The inside of the secondary screen member is connected to the inside of the secondary screen member by a stock pressure feed pipe, and the stock passing through the primary screen member is passed through the stock pressure feed pipe to the stock passing side of the primary screen member. A pump blade that is coaxially driven to rotate coaxially with the impeller for forced pressure feeding inside, and a dilution water inlet for injecting dilution water under pressure, are provided inside the secondary screen member and are coaxially driven to rotate with the pump blade, and A paper stock composite screen characterized in that a scraper is provided having a wing portion that generates vibrations in the secondary screen member when the secondary screen member is rotated.