TWI604103B - Pulp screening network - Google Patents

Description

Pulp screening network

The present invention relates to a pulp screening screen, and more particularly to a pulp screening screen suitable for screening high concentration pulp.

Referring to Figures 1 and 2, a conventional pulp screening screen 1, as shown in the Republic of China New Patent No. 537324, is suitable for agitating and screening large pulp (e.g., recycled paper) pulp.

The pulp screening screen 1 comprises a plurality of spaced-apart positioning frames 11 and a plurality of screens 12 arranged vertically and spaced apart from each other, and a screen opening 13 is formed between each two adjacent screens 12. The positioning frames 11 respectively include an inner wall surface 111 and a plurality of slots 112 formed at intervals on the inner wall surface 111. The screens 12 respectively include a head portion 121 and a root portion 122 that is inserted into the corresponding slot 112 and connects the positioning frames 11 in series, and the root portion 122 forms a barbed shape with the corresponding slot 112. The ground is tightly integrated.

When the pulp screening screen 1 performs the action of stirring the pulp, by the close combination of the sieve sheets 12 and the slots 112, even if the particles of the pulp are large, the sieve sheets 12 are not easy to be used during the stirring process. The slots 112 are detached. However, the heads of the screens 12 respectively have a screen surface 123 facing the stirring vortex and inclined, and the screens 123 form an angle which can only match the direction in which most of the pulp is agitated. But located near the screens 123 Part of the pulp cannot be uniformly mixed. When the high-concentration pulp is sieved, the stirring force of the sieves 12 is still insufficient, thereby causing incomplete screening.

Accordingly, it is an object of the present invention to provide a pulp screening screen suitable for use in screening high consistency pulp.

Thus, the pulp screening net of the present invention comprises a plurality of annular positioning frames arranged at equal intervals and a plurality of sieves.

The positioning frames respectively include an inner wall surface defining a screen space, an outer wall surface opposite to the inner wall surface, and a plurality of slots formed at equal intervals on the inner wall surface.

Each slot has a small slot section formed on the inner wall surface and a large slot section extending from the slot section toward the outer wall section and having a slot width greater than the slot section.

The screens are arranged at intervals on the inner wall surface of the positioning frame, and are inserted into corresponding slots from top to bottom to connect each positioning frame in series.

The screens each include a head portion and a portion facing the screen space and having a recess that is bundled by the head and tightly coupled to the corresponding slot.

The root of each of the two adjacent screens cooperates with the upper and lower two positioning frames to define a screen.

The head of each of the screens further has a first side surface, a second side surface and a screen surface connected to the second side surface by the first side surface, and the distance from the front end of the first side surface to the inner wall surface is smaller than the The distance from the front end of the second side to the inner wall surface, the recess being formed on the screen surface.

The effect of the invention is that the effect of lifting the spoiler by the recesses makes the pulp mixing in the vicinity of the pockets more uniform and suitable for the screening of high-concentration pulp.

2‧‧‧ positioning frame

21‧‧‧ inner wall

211‧‧‧ Screening space

22‧‧‧ outer wall

23‧‧‧Slots

231‧‧‧Small trough

232‧‧‧large trough section

233‧‧‧Slot section

3‧‧‧ sieve

31‧‧‧ head

311‧‧‧ first side

312‧‧‧ second side

313‧‧‧ Screen surface

314‧‧‧ recess

32‧‧‧ Root

321‧‧‧Small roots

322‧‧‧Great roots

323‧‧‧Tail section

4‧‧‧ sieve

5‧‧‧ vortex

R‧‧‧ arrow

Other features and effects of the present invention will be apparent from the following description of the drawings. FIG. 1 is a perspective view illustrating a conventional pulp screening screen; FIG. 2 is a partial cross-sectional enlarged view illustrating The conventional plurality of screens are disposed on a positioning frame; FIG. 3 is a partial enlarged view of the first embodiment of the pulp screening screen of the present invention; and FIG. 4 is a partial cross-sectional enlarged view illustrating the first The plurality of screens of the embodiment are disposed in a positioning frame; and FIG. 5 is a view similar to FIG. 4, illustrating that the plurality of screens of the second embodiment of the pulp screening screen of the present invention are disposed in a positioning frame.

Before the present invention is described in detail, it should be noted that in the following description, similar elements are denoted by the same reference numerals.

Referring to Figure 3, a first embodiment of the pulp screening screen of the present invention comprises a plurality of annular positioning frames 2 and a plurality of screens 3 arranged at equal intervals.

The positioning frames 2 respectively include an inner wall surface 21 defining an screen space 211 for an impeller (not shown), an outer wall surface 22 opposite to the inner wall surface 21, and a plurality of equally spaced surfaces. The inner wall surface 21 slots 23.

The screens 3 are arranged at intervals on the inner wall surface 21 of the positioning frame 2, and are inserted into the corresponding slots 23 from top to bottom to connect each positioning frame 2 in series. The screens 3 respectively include a head portion 31 of the screen space 231 and a root portion 32 extending from the head portion 31 toward the inner wall surface 21.

The root 32 of each two adjacent screens 3 cooperates with the upper and lower two positioning frames 2 to define a screen 4 for the screened pulp to pass and be collected, and between the screens 4 The spacing can be varied as needed, and used to screen pulp of different particle sizes.

Referring to FIG. 4, each slot 23 has a small slot section 231 formed on the inner wall surface 21 and a large slot section 232 extending from the slot section 231 toward the outer wall surface 22 and having a slot width larger than the slot section 231. .

The head 31 of each of the screens 3 has a first side 311, a second side 312, a screen surface 313 connected to the second side 312 by the first side 311, and a screen 313 formed on the screen 313. The pocket 314.

The root portion 32 of each of the screens 3 is bundled by the head portion 31 toward the inner wall surface 21, and has a small root portion 321 and a large root portion 322 having a radius larger than the small root portion 321 , and the small root portion 321 and The large root segments 322 are respectively tightly coupled to the corresponding small slot segments 231 and the large slot segments 232. In this embodiment, the root portions 32 of the sieve sheets 3 are closely coupled with the corresponding slots 23 in a barb shape, so that the root portions 32 are not easily peeled off during the process of filtering the pulp, but this is conventional. Technology is not described here.

When the impeller (not shown) rotates in the screen space 211 in the direction of the arrow R shown in FIG. 4, the first portion of the head 31 is matched. The distance from the front end of one side surface 311 to the inner wall surface 21 is smaller than the distance from the front end of the second side surface 312 to the inner wall surface 21, so that the pulp in the sieve space 211 is easily agitated, and the setting of the recesses 314 is provided. After the agitated pulp enters the pockets 314, a vortex 5 is formed to enhance the effect of the turbulence, so that the pulp located near the interface of the pockets 314 is more evenly disturbed, so that the energy saving of the impeller horsepower is not required. It will be more effective in screening high-concentration pulp.

Referring to Figure 5, a second embodiment of a pulp screening screen of the present invention is similar to the first embodiment. The main difference is that each slot 23 is directed toward the outer wall 22 by the inner wall surface 21. The direction has a small slot section 231, a large slot section 232 having a slot width larger than the slot section 231, and a slot section 233 having a slot width smaller than the slot section 231.

The root portion 32 of each of the screens 3 has a small root portion 321 and a large root portion 322 having a radius larger than the small root portion 321 in a direction from the head portion 31 toward the outer wall surface 22, and a radius smaller than the small root. The narrow tail section 323 of the segment 321 .

Each of the screens 3 is closely coupled to the corresponding small slot section 231, the large slot section 232 and the slot section 233 by the small root section 321, the large root section 322 and the narrow tail section 323, respectively. The arrangement of the recesses 314 allows the present embodiment to achieve the same efficacy as the first embodiment in the process of screening high-concentration pulp.

In summary, the present invention enhances the effect of the turbulence by the pockets 314 located in the head 31 of the screens 3, so that the pulp mixing in the vicinity of the pockets 314 during mixing is more uniform, and is applicable. For high concentration The sieve of the pulp is indeed able to achieve the object of the present invention.

However, the above is only the embodiment of the present invention, and the scope of the present invention is not limited thereto, that is, the simple equivalent changes and modifications made by the patent application scope and the patent specification of the present invention are still It is within the scope of the patent of the present invention.

2‧‧‧ positioning frame

21‧‧‧ inner wall

211‧‧‧ Screening space

22‧‧‧ outer wall

23‧‧‧Slots

231‧‧‧Small trough

232‧‧‧large trough section

3‧‧‧ sieve

31‧‧‧ head

311‧‧‧ first side

312‧‧‧ second side

313‧‧‧ Screen surface

314‧‧‧ recess

32‧‧‧ Root

321‧‧‧Small roots

322‧‧‧Great roots

5‧‧‧ vortex

R‧‧‧ arrow

Claims (4)

A pulp screening net comprising: a plurality of annular positioning frames arranged at an upper and lower intervals, and respectively comprising an inner wall surface defining a sieve space, an outer wall surface opposite to the inner wall surface and a plurality of equal intervals a slot formed in the inner wall surface, each slot having a small slot section formed on the inner wall surface and a large slot section extending from the slot section toward the outer wall surface and having a slot width greater than the slot section; a plurality of sieves are arranged at intervals on the inner wall surface of the positioning frame, and are inserted into the corresponding slots from top to bottom to connect each positioning frame in series, and the sieves respectively comprise a head and a part. The head faces the screen space and has a recessed by the head and tightly coupled with the corresponding slot, the root of each two adjacent screens and the upper and lower two positioning frames Cooperating to define a screen, each head of the screen further has a first side, a second side and a screen surface connected to the second side by the first side, the front end of the first side The distance from the inner wall surface is smaller than the distance from the front end of the second side surface to the inner wall surface, the concave Formed on the screening surface. The pulp screening net according to claim 1, wherein the root of each sieve has a small root segment and a large root segment having a radius larger than the small root segment, and the small root segment and the large root segment respectively correspond to the same The small slot section and the large slot section are tightly coupled. The pulp screening screen of claim 2, wherein the roots of the sieves are tightly coupled to the corresponding slots in a barbed shape. The pulp screening network of claim 1, wherein each slot is from the inside The wall surface has a small groove section in the direction of the outer wall surface, a large groove section having a groove width larger than the small groove section, and a slot section having a groove width smaller than the small groove section, and the root of each sieve piece is composed of the head The portion facing the outer wall surface sequentially has a small root segment, a large root segment having a radius larger than the small root segment, and a narrow tail segment having a radius smaller than the small root segment, the small root segment, the large root segment and the narrow tail The segments are intimately coupled to the corresponding small slot segments, the large slot segments, and the slot segments, respectively.