JP3280910B2 - Screen device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

The present invention relates to a screen device, and more particularly, to a screen device.
The present invention relates to a screen device that enhances the eye-cleansing effect of a screen and improves the selection efficiency.

[0002]

2. Description of the Related Art In a screen device for removing foreign matter from papermaking raw materials, a stirring member (foil or agitator) is used.
When the is rotated, pressure is applied to the screen at the front of the stirring member, but negative pressure occurs at the rear of the stirring member, which passes through the screen and flows backward from the selected side to remove fibers and the like adhering to the screen. This is the so-called eye-washing effect of the screen.

[0003]

However, in the conventional screen apparatus, the papermaking raw material in the tank is circulated in the same direction as the rotation direction of the stirring member by the stirring member. Since the relative speed between the agitating member and the papermaking material is reduced, the negative pressure on the screen generated at the rear of the agitating member is reduced, and the effect of the screen washing is weakened. There was a problem that the decline of the.

An object of the present invention is to provide a screen device which eliminates the above-mentioned problems.

[0005]

In order to achieve the above-mentioned object, a screen device according to the present invention comprises a tank for receiving a papermaking raw material, a supply passage for supplying the papermaking raw material to the tank, and a first tank. and a screen that is divided into the chamber and a second chamber, this
The screen has a cylindrical shape, is provided between the screen and the tank, and a stirring member for stirring the papermaking raw material in the tank, and the stirring member is provided on the outer periphery of the rotating body.
A first discharge passage attached to the first chamber, which is upstream of the screen in the tank, and discharges foreign substances contained in the papermaking raw material to the outside of the tank; and the second chamber. And a second discharge passage for passing the selected papermaking raw material out of the tank through the screen, and a projection provided on an inner wall of the tank.

The screen apparatus according to the present invention also includes a tank for receiving a papermaking raw material, a supply passage connected to an upper side of the tank for supplying the papermaking raw material, and a first chamber and a second chamber for the tank. Screen and this screen is a circle
In cylindrical shape, it is provided between the tank and the screen, a stirring member for stirring the papermaking material in the tank, this
Is attached to the outer periphery of a rotating body, is connected to the lower side of the tank, communicates with the first chamber upstream of the screen in the tank, and includes foreign matter contained in the papermaking raw material. And a first discharge passage for discharging the papermaking material to the outside of the tank, connected to a lower side of the tank, communicating with the second chamber, passing through the screen, and discharging the selected papermaking raw material to the outside of the tank. A second discharge passage, a projection provided on the inner wall of the tank, and a lower side of the projection is provided so as to be inclined from an upper side so as to approach the rotation direction of the stirring member, and is provided on a lower side of the tank. The moving papermaking raw material is moved to the upper side of the tank by the inclined protrusion.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A screen device according to an embodiment of the present invention will be described with reference to the drawings. In FIG. 1, reference numeral 1 denotes a screen device, and the screen device 1 is a device for removing foreign substances such as plastics contained in papermaking raw materials and selecting the same.

[0008] The screen device 1 is divided into a first chamber 4 and a second chamber 5 by a screen 3 in a tank 2 for receiving a papermaking raw material. A projection 20 is provided on the inner wall of the tank 2.

As shown in FIGS. 2 and 3, for example, a plurality of projections 20 (six in this embodiment) are provided. FIG. 3 shows the positional relationship between the projections 20 provided on the inner wall of the tank 2 by expanding the tank 2. If the height H (see FIG. 2) of the projection 20 is increased, the effect of the eye-washing effect of the screen 3 described later increases, but the power consumption of the screen device 1 also increases. Is selected according to the processing conditions such as the papermaking raw material and the purpose of use of the papermaking raw material to be processed. Usually, the height H of the projection 20 is desirably about 5% to 40% of an interval L (see FIG. 2) between the tank 2 and a screen 3 described later.

The screen 3 is for separating foreign matter contained in the papermaking raw material in the tank 2 and has a cylindrical shape with an upper end closed and a lower end opened.
A large number of round holes (or slits) of mm to 6 mm are provided.

Reference numeral 6 denotes a support member having a built-in bearing Z and supporting the screen 3. A rotary shaft 7 is provided through the support member 6, and the rotary shaft 7 includes a motor (not shown) and a belt B.
To rotate. A rotating body 8 is attached to the rotating shaft 7.

A stirring member (a foil or an agitator) 9 is attached to the outer periphery of the rotating body 8. The stirring member 9 is located (provided) between the screen 3 and the tank 2. Is designed to be stirred.

Reference numeral 10 denotes a supply passage for supplying papermaking raw materials to the tank 2, and the supply passage 10 is provided above the tank 2.
10a is a supply port.

Further, a first discharge passage 12 communicating with the first chamber 4 on the upstream side of the screen 3 in the tank 2 is provided,
The first discharge passage 12 discharges foreign substances contained in the papermaking raw material to the outside of the tank 2, and 12a is a first discharge port.

A second discharge passage 14 communicating with the second chamber 5 downstream of the screen 3 in the tank 2 is provided.
The second discharge passage 14 passes through the screen 3 and discharges the selected papermaking raw material to the outside of the tank 2.

Therefore, the papermaking raw material is supplied to the supply passage 10 and the supply port 10.
a, the papermaking raw material received in the tank 2 is agitated by the agitating member 9, foreign matter contained in the papermaking raw material cannot pass through the screen 3, And is discharged outside the tank 2 through the first discharge passage 12.

After passing through the screen 3, the selected papermaking raw material is discharged out of the tank 2 through the second discharge passage 14.

Conventionally, since the papermaking raw material in the tank is circulated by the stirring member in the same direction as the rotation direction of the stirring member along the rotation direction of the stirring member, the relative speed between the stirring member and the papermaking raw material is reduced. The negative pressure on the screen generated at the rear part of the member is reduced, and the effect of the screen washing is weakened. As a result, the screen is clogged and the screening efficiency is reduced.
According to this, the circulating speed of the papermaking raw material circulating in the tank 2 is hindered by the projections 20 provided on the inner wall of the tank 2,
And the relative speed between the paper 3 and the papermaking raw material can be increased, the negative pressure on the screen 3 generated at the rear of the stirring member 9 can be increased, and the washing effect of the screen 3 can be enhanced. The clogging can be prevented, the selection efficiency can be increased, and the agitation of the papermaking raw material in the tank 2 is promoted by the projections 20 provided on the inner wall of the tank 2,
The selection efficiency can be increased.

The number of protrusions 20, the number of steps, and the angle are not limited to those in the above-described embodiment, but may be appropriately set in accordance with processing conditions. For example, the number of steps may be three, as shown in FIG. As shown in FIGS. 5 and 6, two stages may be used.
As shown in FIG. 5, the lower side of the projection 20 may be inclined from the upper side so as to approach the rotation direction Y of the stirring member 9,
As shown in a part of FIG. 6, the lower side of the protrusion 20 may be inclined so as to be further away from the upper side in the rotation direction Y of the stirring member 9.

In particular, as shown in FIGS. 4 and 5, a supply passage 10 for supplying papermaking raw material is connected to the upper side of the tank 2 (supply port).
10a) If the lower side of the projection 20 is provided so as to be inclined from the upper side so as to approach the rotation direction of the stirring member 3, the papermaking material moving to the lower side of the tank 2 is moved to the upper side of the tank 2 by the inclined projection 20. To prevent the papermaking raw material concentrated on the lower side of the tank 2 from moving, thereby increasing the efficiency of selective selection. In addition,
The first discharge passage 12 is connected to the lower side of the tank 2 and communicates with the first chamber 4 on the upstream side of the screen 3 in the tank 2 to be included in the papermaking raw material, as in the above-described embodiment. The foreign matter discharged from the tank 2 is discharged to the outside of the tank 2, and the second discharge passage 14 is connected to the lower side of the tank 2 in the same manner as in the above-described embodiment.
Is discharged to the outside of the tank 2 by passing through the screen 3 and communicating with the second chamber 5 on the downstream side.

[0021]

Conventionally, the papermaking raw material in the tank is circulated by the stirring member in the rotation direction of the stirring member in the same direction as the rotation direction of the stirring member, so that the relative speed between the stirring member and the papermaking raw material decreases. 2. The screen device according to claim 1, wherein the negative pressure on the screen generated at the rear of the stirring member is reduced, and the effect of the screen washing is reduced. As a result, the screen is clogged and the selection efficiency is reduced. According to this, the circulating speed of the papermaking raw material circulating in the tank is hindered by the projections provided on the inner wall of the tank, the relative speed between the stirring member and the papermaking raw material can be increased, and the screen generated at the rear of the stirring member To increase the effect of screen eyewashing, as a result,
Clogging of the screen can be prevented, and the selection efficiency can be increased. In addition, the projections provided on the inner wall of the tank promote the stirring of the papermaking raw material in the tank, thereby increasing the selection efficiency.

According to the screen device of the second aspect, in addition to the effect of the first aspect, the papermaking raw material moving to the lower side of the tank is moved to the upper side of the tank by the inclined projection. It is possible to prevent the concentrated papermaking raw material from moving to the lower side of the tank, thereby improving the selection efficiency.

[Brief description of the drawings]

FIG. 1 is a schematic sectional side view showing a part of a screen device according to an embodiment of the present invention.

FIG. 2 is a schematic sectional view taken along line XX of FIG. 1;

FIG. 3 is a schematic development view of the tank shown in FIG.

FIG. 4 is a schematic development view of a tank according to another embodiment different from FIG. 3;

FIG. 5 is a schematic development view of a tank according to another embodiment different from FIG. 4;

FIG. 6 is a schematic development view of a tank of another embodiment different from FIG. 5;

[Explanation of symbols]

 Reference Signs List 1 screen device 2 tank 3 screen 4 first chamber 5 second chamber 9 stirring member 10 supply passage 12 first discharge passage 14 second discharge passage 20 protrusion

Claims (2)

(57) [Claims] 1. A tank for receiving a papermaking raw material, a supply passage for supplying the papermaking raw material to the tank, a screen for dividing the tank into a first chamber and a second chamber, and the screen has a cylindrical shape. in shape, is provided between the tank and the screen, a stirring member for stirring the papermaking material in the tank, the stirring member is attached to the outer periphery of the rotating body, upstream of said screen in said tank A first discharge passage communicating with the first chamber, which is a side of the container, for discharging foreign substances contained in the papermaking raw material to the outside of the tank; and a first discharge passage communicating with the second chamber and passing through the screen. A screen device comprising: a second discharge passage for discharging the formed papermaking material outside the tank; and a projection provided on an inner wall of the tank. A tank for receiving a wherein papermaking raw material, is connected to the upper side of the tank, a supply passage for supplying the papermaking material, a screen for dividing the tank into a first chamber and a second chamber, the screen is a cylindrical shape, is provided between the tank and the screen, a stirring member for stirring the papermaking material in the tank, the stirring member is attached to the outer periphery of the rotating body, said vessel A first discharge passage connected to a lower side of the container and communicating with the first chamber upstream of the screen in the tank to discharge foreign substances contained in the papermaking raw material out of the tank; A second discharge passage connected to the lower side of the tank, communicating with the second chamber, passing through the screen, and discharging the selected papermaking raw material to the outside of the tank; and a second discharge passage provided on the inner wall of the tank. And the lower side of the projection is higher than the upper side. Tilted provided so as to approach the rotational direction of the member, the screen apparatus characterized by moving the upper side of the tank by the inclined the papermaking material moving the projection on the lower side of the tank.