JPS5932594B2 - Pressure type composite screen for paper manufacturing - Google Patents

Description

[Detailed description of the invention] The present invention is a pressure-type composite screen used in the paper industry.

Specifically, when waste paper such as newspapers and magazines is disintegrated, the foreign substances (metal pieces, stones, plastic pieces, styrene pieces, vinyl pieces) that are mixed in in large numbers in the raw materials are separated from the paper fibers and sent to the post-processing room. This invention relates to a pressure-type composite screen that reduces damage to secondary screen members by preventing damage to the secondary screen member, performs accurate selection, and enables selection processing at a processing concentration of 3 to 4%, which is higher than that of conventional screens. It is something. Conventionally, coarsely disintegrated raw materials were introduced into a cylindrical screen member,
A pressure-type screen is known in which the screening process is carried out by passing the cylindrical secondary screen member through the action of a rotor equipped with stirring rod pieces. Since they are the same and the action of the stirring rod pieces is evenly distributed, highly efficient screening was possible utilizing the entire screen surface. Therefore, if metal pieces, stones, plastic pieces, or other foreign objects get mixed in, they will stay between the screen member and the rotor, and the foreign objects will be trapped between the screen member and the stirring rod piece. The screen member may be damaged due to biting, rolling, rolling, etc., the screening hole may be deformed, the size and shape may become irregular, and the selection accuracy may be reduced; , sheet pieces of polyethylene, strings, etc.
In the case of gummy materials such as hot-melt materials used to bind magazines, there is a drawback that the material blocks the screening holes of the screen member, significantly reducing the screening ability. The present invention was made to eliminate the above-mentioned drawbacks, and uses the pressure screen (referred to as a post-processing chamber in this application) and an impeller to separate foreign substances in the raw material, and passes the paper stock through the primary screen member. The pre-processing chamber is connected to the paper stock delivery section and the introduction section to prevent foreign matter from entering the post-processing chamber, which could cause damage to the cylindrical secondary screen member or a decline in screening ability. The purpose of the present invention is to provide a pressure-type composite screen for paper manufacturing that does not cause

Next, an embodiment of the pressure-type composite screen for paper manufacturing according to the present invention will be explained based on the drawings.

In the figure, reference numeral 1 denotes a post-processing chamber, which is attached to one side of the upper part of the base 3 by means of mounting legs 2, one end of which is sealed with a lid 4, and an introduction section a for selected paper stock is provided at the other end.

6 is a cylindrical secondary screen member provided inside the post-processing chamber 1, which is screwed to the mounting ring 7 of the post-processing chamber 1 from the pre-processing chamber side (described later), and the other end is connected to the post-processing chamber 1. A selected paper stock chamber 8 is placed in contact with and around the cylindrical secondary screen member 6 described above.
is provided.

Reference numeral 9 denotes a bearing case which is provided adjacent to the post-processing chamber 1 and whose center is aligned with this chamber 1, and is fixed to the base 3 by mounting legs 10.

Reference numeral 11 denotes a main shaft supported by the bearing housing 9. Its tip is inserted into the center of the cylindrical secondary screen member 6 through the shaft sealing part 12 of the lid 4, and a passive shaft 11 is connected to the rear end of the main shaft. A wheel 14 is attached.

A rotor 15 is provided concentrically within the cylindrical secondary screen member 6, and is secured to the main shaft 11 by a fitting key 16 from the pretreatment chamber side, which will be described later.

Reference numeral 17 denotes a plurality of stirring rod pieces attached to the outer peripheral surface of the rotor 15, which rotate to wipe the inner surface of the cylindrical secondary screen member 6 to generate pulsating pressure of the raw material. , its shape and attachment method can be varied and modified in various ways to suit the properties of the paper stock to be processed, and illustrations thereof will be omitted.

Reference numeral 18 denotes a screening hole provided in the cylindrical secondary screen member 6, and either a fine circular hole or a narrow slit is selectively used.

19 is the introduction part a of the selected paper stock in the above-mentioned post-processing chamber 1;
A pre-treatment chamber is provided by joining a selected paper stock delivery part b to a pre-treatment chamber, which preferably has a larger cross-sectional area and a longer length than the post-treatment chamber 1, and contains the necessary amount of raw material. The capacity is determined to provide sufficient residence time.

Reference numeral 20 denotes a primary screen member provided on the earth flow side with respect to the selected stock delivery section a of the pretreatment chamber 19, and is formed into a flat surface, an umbrella surface, a funnel surface, etc., so that objects can be easily projected in the centrifugal direction.

Reference numeral 22 denotes an impeller installed in the pretreatment chamber 19 close to the primary screen member 20 described above, which is fixed to the rotor 15 through a hole drilled in the plate-shaped primary screen 20, rotated together with the rotor 15, and rotated together with the rotor 15. Actions such as disintegration of the raw material in the processing chamber 19, separation of heavy foreign matter to the outer periphery by swirling flow and centrifugal force, and concentration of light foreign matter at the vortex center of the swirling flow are performed.

Reference numeral 23 denotes an outlet pipe for lightweight foreign matter, which is attached to the center of the lid 5, which is attached to and removed from the entrance end of the pretreatment chamber 19, in correspondence with the impeller 22, and is equipped with a valve 24, through which the light foreign matter is discharged. .

A raw material inlet pipe 25 is connected tangentially to the peripheral surface of the pretreatment chamber 19 near the impeller 22, and feeds the raw material into the pretreatment chamber 19 in accordance with the swirling flow of the raw material by the impeller 22.

Reference numeral 26 denotes an outlet pipe for heavy foreign matter that is connected to the peripheral surface of the pretreatment chamber 19 approaching the lid 5, and is equipped with a valve 27, which is opened to discharge the heavy foreign matter.

Reference numeral 28 denotes a secondary selected stock outlet pipe connected to the selected stock chamber 8 in the post-processing chamber 1, through which the second selected stock is sent out.

Reference numeral 29 denotes a rear chamber formed between the lid 4 that closes one end of the post-processing chamber 1 and the rotor 15, which receives foreign matter that cannot pass through the cylindrical secondary screen member 6, and receives foreign matter connected to the lid 4. It is designed to be discharged to the outside from an outlet pipe 30.

In addition, in the above embodiments and drawings, this multiple starne is shown as a horizontal type in which the pre-processing chamber 19 and the post-processing chamber 1 are arranged side by side, but it is assumed that the pre-processing chamber 19 and the post-processing chamber 1 are arranged vertically in the ground. In this case, exactly the same effect is achieved, and the raw material is not fed into the pretreatment chamber 19 from the inlet pipe 25 shown in the embodiment and the drawings.
It is also possible to position the outlet pipe 23 of the light foreign matter as an inlet pipe, and in this case, the non-passing material containing the light foreign matter is removed together with the heavy foreign matter, but it does not affect the paper stock for post-processing. There is no problem in operation. An embodiment of the pressure-type composite screen for paper manufacturing according to the present invention is constructed as described above, so that the regulating valves of the raw material inlet pipe 25 and the selected raw material outlet pipe 28 (none of which are shown in the drawings) By adjusting the differential pressure of the raw material between the intake side and the outlet side to be constant, the amount of raw material passing through (the amount passing through the inlet pipe) is determined. If raw material with a concentration about 5 times higher (more than 3 to 4% bone dry) is tangentially blown into the pretreatment chamber 19, the raw material will be absorbed by the blowing force and the impeller 2 rotating in the pretreatment chamber 19.
2, the sealing pieces such as metal pieces, stones, plastic pieces, vinyl, etc. are mixed in by the action of centrifugal force while being effectively disintegrated by rotating at high speed in the pretreatment chamber 19. Foreign objects such as pieces of wood are removed to the outer periphery and collected into a heavy foreign object outlet pipe 26 provided at the other end, and light foreign objects, such as pieces of sheets of styrofoam, vinyl, polyethylene, strings, etc., are removed by the rotation of the impeller 22. Pretreatment chamber 1
As shown in Figure 1 of the drawings, the raw material that has moved leftward along the outer wall of the pretreatment chamber 19 causes convection that moves rightward through the center, creating a vortex column at the center of the pretreatment chamber 19, so that the raw material is collected by the vortex column. Since the light foreign matter flows toward the outlet pipe 23 and is collected in the outlet pipe 23, by opening the valves 27 and 24 provided on the outlet pipes 26 and 23 at any time, the heavy foreign matter and the light foreign matter are discharged to the outside. Ru.

On the other hand, the raw material that has passed through the primary screen member 20, residual foreign matter and crude raw materials that cannot pass through the screening hole 21 have been removed, and has flown out to the delivery section b is transferred from the introduction section a to the cylindrical secondary starne member 6 and the rotor 15. The material is introduced into the raw material and is sorted by the cylindrical secondary screen member 6. At this time, since there are no large foreign substances in the raw material that could cause damage to the cylindrical secondary screen member 6, the stirring bar is used. The pieces 17 are not disturbed by foreign substances, and the cylindrical secondary screen member 6 is not damaged or clogged, thereby reducing its performance, and it is possible to perform accurate sorting.

Further, even if the fine particles and disintegrated materials that cannot pass through the cylindrical secondary screen member 6 are inserted between the cylindrical secondary screen member 6 and the rotor 15 through the primary screen member, Next, it flows along the screen member 6 to the rear chamber 29 side,
When it reaches the rear chamber 29, it is discharged to the outside through an outlet pipe 30.

In order to eliminate damage to the cylindrical secondary screen 7 member due to foreign matter, the pressure-type composite screen for paper manufacturing according to the present invention uses an impeller to generate a swirling flow of raw material on the upstream side of the screen member with respect to the selected paper stock flow. A pre-treatment chamber is installed in which foreign substances in the raw materials are separated and the paper stock is sent through the primary screen member.This allows only the primarily selected paper stock to be sent to the post-processing chamber, so metal pieces, stones, Plastic pieces and other heavy foreign matter are separated from the paper stock by the vortex, swirling motion, and centrifugal force generated in the pretreatment chamber by the rotation of the impeller, and the foreign matter is sorted by the primary screen member and transferred to the cylindrical secondary screen member. Since foreign matter is prevented from entering the post-processing chamber, various harmful effects caused by foreign matter entering the post-processing chamber are prevented.Also, since the impeller is provided in the pre-processing chamber close to the primary screen member, The rotation of this impeller effectively disintegrates the paper stock, and also gives the raw material a whirlpool in the direction of rotation and a vortex, and the resulting centrifugal force causes heavy foreign matter in the raw material to be blown to the outer peripheral wall of the front chamber. The particles fall into the outlet pipe while swirling around the peripheral wall, and are expelled from the outlet pipe along with a part of the raw material. Due to the action of the vortex generated in the center of the raw material, most of the foreign matter in the raw materials gathers in the center, and when the lightweight foreign matter outlet pipe installed in the center of the lid of the pretreatment chamber is opened, they are expelled to the outside, so most of the foreign matter in the raw materials is removed from the pretreatment chamber. removed in In addition, even if foreign particles small enough to pass through the primary screen member stay in the cylindrical secondary screen member, there is no risk of damaging or deforming the screen member, and the stirring rod on the circumferential surface of the rotor The particles are sent to the rear chamber and discharged from the foreign body outlet pipe, so
Eliminate damage to the cylindrical secondary screen surface and process concentration 3~
It has a unique effect that allows highly accurate screening at a high concentration of 4%.

[Brief explanation of drawings]

The drawings show an embodiment of the pressure gas screen according to the present invention, and FIG. 1 is a longitudinal sectional front view. Figure 2 is a longitudinal side view of the central chamber. FIG. 3 is a longitudinal side view of the front chamber. In the figure, 1 is a post-treatment chamber, a is a selected paper stock introduction section, 6 is a cylindrical secondary screen member, 15 is a rotor, 17 is a stirring rod piece, 19 is a pre-treatment chamber, and b is a selected paper stock 20 is a primary screen member.

Claims (1)

[Scope of Claims] 1. A pretreatment chamber in which a swirling flow of the raw material is generated by the rotation of an impeller to separate foreign matter in the raw material, and the paper stock is primarily screened through a primary screen member corresponding to the impeller and sent to a delivery section; a post-processing chamber in which the primary selected paper stock is introduced into a cylindrical secondary screen member from an introduction part, and is subjected to secondary screening through the cylindrical secondary screen member by the action of a rotor equipped with a stirring rod piece; A pressure-type composite screen for paper manufacturing, characterized in that the feed section and introduction section for the selected paper stock are joined together to form a series. 2 Create a swirling flow of the raw material by rotating the impeller,
a pretreatment chamber that separates foreign substances in the raw material, distinguishes heavy foreign substances and light foreign substances from the inside and outside, and removes them, performs a primary screening of the stock through a primary screen member corresponding to an impeller, and sends it to a delivery section; a post-processing chamber in which paper stock is introduced into a cylindrical secondary screen member from an introduction part and subjected to secondary selection through the cylindrical secondary screen member by the action of a rotor equipped with a stirring rod piece; A pressure-type composite screen for paper manufacturing, characterized in that a paper feeding section and an introduction section are connected to form a series.