JPH0232398B2 - - 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 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 performed, and then the paper stock that has passed through the gap is allowed to flow down and sent to a cylindrical screen member below the rotary disintegration, and secondary disintegration is performed in this cylindrical screen member to produce selected paper stock. It is structured to obtain the following.

[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 a 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 for solving problems]

In the paper stock composite screen according to the present invention, the impeller is mounted on the paper stock passing side of the primary screen member that allows the primary separation paper stock separated from foreign matter to pass through by the rotation of the impeller in the primary separation chamber into which the papermaking raw materials are injected under pressure. A pump blade is provided that is driven to rotate coaxially with the
The rotating centrifugal force of the pump blade is configured to forcibly feed the paper stock passing through the primary screen member to the secondary screen member, and by being rotated, a vibration effect is generated in the secondary screen member. In addition, a scraper is provided for forcing the paper stock forcibly fed by the pump blade to pass through the secondary screen member, and this scraper is connected to the pump blade and driven to rotate integrally with the pump blade. It is configured to allow

[Effect]

In the paper material composite screen of this invention,
The paper stock that has passed through the primary screen member can be forced to pass through the secondary screen member by a scraper while being secondarily pressurized by a pump blade and forcibly fed into the secondary screen member. Moreover, the scraper generates a vibration effect on the secondary screen member by rotation. Furthermore, since the scraper is connected to the pump blade and rotated together with the pump blade, the pump blade and the scraper can be attached to and removed from the rotating shaft together.

〔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 fifth housing members 1A to 1E that are assembled in a sequentially upward manner so that they can be assembled and disassembled. ing.

In these housing members 1A to 1E,
Fifth stage housing member 1E 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. At a position adjacent to the lower part of the impeller 8, there is arranged a primary separation chamber 2 made of a perforated plate. Screen member 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.

The fourth stage housing member 1D is formed with an annular primary selection stock chamber 11 that is open on the inside along its inner peripheral surface, and this primary selection stock chamber 11 is provided with a dilution water inlet 11a. ing.

In this housing member 1D, a rotating shaft 6 is located near the lower part of the primary screen member 9.
A pump blade 12 connected to the pump blade 12 is housed.

Here, the fifth stage housing member 1E is
After removing the housing member 1D from the third stage, remove the tightening nut 7, and then attach the fourth housing member 1D to the third housing member 1C.
By removing the pump blade 12 from the pump blade, the pump blade 12 can be replaced with another pump blade having a different size (performance).

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 inner peripheral surface of the secondary separation chamber 16 to form an annular secondary selected paper stock chamber. 18 is formed.

The secondary separation chamber 16 includes a secondary selected paper stock chamber 1.
A stock outlet 19 leading to 8 is provided.

Further, a scraper 21 is housed within the secondary screen member 17 and is integrally connected to the lower part of the pump blade 12 and hangs down.

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 is the 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 1B 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 13 that communicates with the mechanical seal 13.
A is provided.

On the other hand, the lower end of the rotating shaft 6 is connected to a pulley 27,
Electric motor 30 via transmission belt 28 and pulley 29
It is linked with.

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.
It rotates synchronously with the

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 stock passes through the primary screen member 9 and is splashed into the primary 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. In addition, the dilution water injected under pressure from the dilution water inlet 11a is mixed in, and the secondary screen is forcibly pressurized by the pressurizing force of this dilution water and the rotational centrifugal force of the pump blade 12. It is forcibly fed into the 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 selected stock chamber 18, thereby becoming selected stock at the stock outlet 19. is discharged from.

Here, the secondary screen member 17 is prevented from clogging due to the vibration effect of the scraper 21 that rotates together with the pump blade 12.

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

FIG. 5 shows a second embodiment. In this second embodiment, an annular foreign matter separation chamber 18a is formed between the inner peripheral surface of the secondary separation chamber 16 and the secondary screen member 17, and a reject outlet 20 is provided at the bottom of this foreign matter separation chamber 18a. , and secondary screen member 1
A paper stock outlet 19 is provided in communication with the inner bottom of the paper stock 7 .

And the scraper 2 integrated with the pump blade 12
1 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 that has been separated from foreign matter by the impeller 8 and passed through the primary screen member 9 is forcibly fed into the foreign matter separation chamber 18a by the centrifugal force of rotation of the pump blades 12.
The paper stock passes from the outside to the inside of the secondary screen member 17 within a, 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 paper stock in the foreign matter separation chamber 18a is discharged out of the system from the reject 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 concentration sensor (not shown) is used to detect the concentration of paper stock that is detected by the concentration sensor. The electric motor 30 may be automatically controlled to obtain a force 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 pressurized by the pump blade and is forcibly fed to the secondary screen member, while being forced to the secondary screen member by the scraper. Since the stock is passed through the secondary screen member, the stock can be reliably passed through the secondary screen member. Moreover, since the scraper generates a vibration effect on the secondary screen member by rotation, clogging of the secondary screen member can be prevented, and high quality refined paper stock can be efficiently obtained. Further, since the pump blade and the scraper can be attached and detached together from the rotating shaft, the working efficiency of assembling and disassembling the pump blade and the scraper can be improved.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view of a paper material composite screen according to a first embodiment of the present invention, and FIG.
A line sectional view, Figure 3 is a - line sectional view of Figure 1,
Figure 4 is a sectional view taken along the - line in Figure 1, and Figure 5 is a cross-sectional view of Figure 2.
FIG. 2 is a longitudinal cross-sectional view of a paper stock composite screen according to an example. 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, 12 is a pump blade, 16 is a secondary separation chamber, 17 is a secondary screen member, and 21 is a scraper. 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 the paper stock composite screen that secondarily separates the selected paper stock and foreign matter using the secondary screen member in the secondary separation chamber, a pump blade driven to rotate coaxially with the impeller is installed on the paper stock passing side of the primary screen member. The rotating centrifugal force of the pump blade is used to forcibly feed the paper stock passing through the primary screen member to the secondary screen member, and the rotation produces a vibration effect on the secondary screen member. A scraper is provided which causes the paper stock forcibly fed by the pump blade to pass through the secondary screen member, and this scraper is connected to the pump blade so as to be integrated with the pump blade. A paper stock composite type screen characterized by being configured to be rotationally driven.