CN110359309B

CN110359309B - Pressure screen for papermaking

Info

Publication number: CN110359309B
Application number: CN201910657807.5A
Authority: CN
Inventors: 张斌
Original assignee: Henan Xinya New Technology Packaging Materials Co ltd
Current assignee: Henan Xinya new technology packaging materials Co.,Ltd.
Priority date: 2019-07-20
Filing date: 2019-07-20
Publication date: 2020-12-25
Anticipated expiration: 2039-07-20
Also published as: CN110359309A

Abstract

The invention relates to the field of papermaking equipment and discloses a pressure screen for papermaking, which comprises a screen cylinder, a rotating shaft, a screen drum, a pressure screen rotor, a slag discharge pipe, a pulp discharge pipe and a pulp inlet pipe, wherein the inside of the pressure screen rotor is communicated with the inside of the screen cylinder, and a plurality of rotor blocks are arranged on the side surface of the pressure screen rotor. This pressure screen for papermaking, through the design of the flow equalizing plate that screen cylinder and pressure screen rotor communicate with each other and top, make the paper pulp that gets into all have the inside that falls into screen cylinder and pressure screen rotor, when the pressure screen rotor is rotatory, the interior paper pulp of rotor piece effect screen cylinder on the pressure screen rotor, the paper pulp that is thrown away by the rotatory centrifugation of pressure screen rotor simultaneously acts on the paper pulp in the screen cylinder, make the thick liquids of flow process filter screen in the screen cylinder not be in the whirl state of an angle all the time, effectual whirl paper pulp to the filter screen department of screen cylinder side extrudees, ensure that the filter screen is difficult for blockking up, can not influence the filtration efficiency of follow-up thick liquids.

Description

Pressure screen for papermaking

Technical Field

The invention relates to the field of papermaking equipment, in particular to a pressure screen for papermaking.

Background

The inward flow type pressure screen is a paper pulp screening device, has the advantages of high screening quality and high screening capacity, is suitable for being used as a fine screening device for wood pulp, straw pulp and waste paper pulp, and has the following working principle (refer to figure 5): paper pulp enters from a pulp inlet pipe 9, a slag guide box 6 is driven by a driving motor to drive a pressure screen rotor 4 inside a screen cylinder 3 to rotate, and qualified paper pulp rapidly passes through the screen cylinder by means of pressure difference and is screened by the screen cylinder to separate coarse impurities in the paper pulp.

However, current pressure sieve is in the use, and paper pulp is by the rotational action of pressure sieve rotor, and paper pulp forms the vortex state, relies on pressure differential to pass through the screen cylinder rapidly, and makes the thick liquids of screen cylinder internal flow through the filter screen be in the whirl state of an angle all the time, and the easy card of thick impurity in the paper pulp is on the screen mesh hole of screen cylinder to cause the jam problem, reduced the efficiency of follow-up paper pulp screening.

Disclosure of Invention

The invention provides a pressure screen for papermaking, which has the advantage that a filter screen of a screen cylinder is not easy to block, and solves the technical problems in the background technology.

The invention provides the following technical scheme: the utility model provides a paper grade (stock) pressure screen, includes a sieve section of thick bamboo, pivot, screen cylinder, pressure screen rotor, arranges the sediment pipe, arranges the thick liquid pipe, advances the thick liquid pipe, the inside of pressure screen rotor communicates with each other with the inside of a sieve section of thick bamboo, the side of pressure screen rotor is equipped with a plurality of rotor pieces, and the inside of rotor piece communicates with each other with the inside of pressure screen rotor, and the outside of rotor piece has seted up logical groove, the bottom of a sieve section of thick bamboo inner chamber is equipped with the sediment case that leads that is used for connecing the filter residue.

Preferably, the inner cavity of the screen drum is provided with a flow equalizing plate positioned at the top of the screen drum, the flow equalizing plate is positioned below the pulp inlet pipe, the middle part of the flow equalizing plate is provided with a plurality of water permeable holes, and the arrangement range of the water permeable holes is positioned in the screen drum.

Preferably, the bottom of the inner cavity of the pressure screen rotor is fixedly connected with a positioning shaft, and the positioning shaft is fixedly sleeved with a helical blade.

Preferably, the slag guide box is communicated with the slag discharge pipe, the bottom of one side of the slag guide box communicated with the slag discharge pipe is lower, and the slag guide box is communicated with the inner cavity of the screen drum.

The invention has the following beneficial effects:

according to the pressure screen for papermaking, through the communication between the screen cylinder and the pressure screen rotor and the design of the flow equalizing plate at the top of the pressure screen rotor, the entering paper pulp falls into the screen cylinder and the pressure screen rotor, when the pressure screen rotor rotates, the rotor wing blocks on the pressure screen rotor act on the paper pulp in the screen cylinder, and meanwhile, the paper pulp thrown out centrifugally by the rotation of the pressure screen rotor acts on the paper pulp in the screen cylinder, so that the pulp flowing in the screen cylinder and passing through the filter screen is not always in an angular rotational flow state, the rotational flow paper pulp at the filter screen on the side surface of the screen cylinder is effectively extruded, the filter screen is ensured not to be blocked easily, and the filtering efficiency of subsequent pulp is not; meanwhile, the pulp is injected into the pressure screen rotor under the action of certain pressure to impact the spiral blades, so that certain power is provided for the rotation of the pressure screen rotor, the resistance of the rotor wing is increased by overcoming the ejection of the pulp vortex in the screen cylinder, and the screening efficiency of the pulp is further improved; and the flow equalizing plate preliminarily filters larger particles in the pulp, so that the problem that the rotor of the pressure screen is blocked by larger coarse impurities in the pulp is avoided.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a cut-away view of a screen cylinder of the present invention;

FIG. 3 is a top view of the structure of the present invention;

FIG. 4 is a schematic view of a pressure screen rotor of the present invention construction;

fig. 5 is a schematic diagram of a conventional pressure screen.

In the figure: 1. a screen cylinder; 2. a rotating shaft; 3. a screen cylinder; 4. a pressure screen rotor; 401. a rotor block; 402. a through groove; 403. positioning the shaft; 404. a helical blade; 5. a flow equalizing plate; 501. water permeable holes; 6. a slag guide box; 7. A slag discharge pipe; 8. a slurry discharge pipe; 9. a slurry inlet pipe.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-4, a pressure screen for papermaking comprises a screen cylinder 1, a rotating shaft 2, a screen cylinder 3, a pressure screen rotor 4, a slag discharge pipe 7, a pulp discharge pipe 8 and a pulp inlet pipe 9, wherein the screen cylinder 1 is fixedly sleeved with the screen cylinder 3, the bottom of the side surface of the screen cylinder 1 is communicated with the pulp discharge pipe 8 positioned at the screen cylinder 3, the top of the other side of the screen cylinder 1 is communicated with the pulp inlet pipe 9, the bottom of the other side of the screen cylinder 1 is communicated with the slag discharge pipe 7 positioned below the screen cylinder 3, the middle part of the inner cavity of the screen cylinder 1 is provided with the pressure screen rotor 4 positioned in the screen cylinder 3, the pressure screen rotor 4 rotates along with the rotating shaft 2, the rotating shaft 2 is driven to rotate by a driving motor, the outer side of the pressure screen rotor 4 is provided with a plurality of rotor blocks 401, the inner parts of the rotor blocks 401 are communicated with the inner parts of the pressure screen rotor 4, the outer sides of the rotor blocks 401 are provided with through grooves 402, the inner cavity cover of a screen cylinder 1 is equipped with a flow equalizing plate 5 positioned on the top of a screen cylinder 3, the flow equalizing plate 5 is fixed by screws, the middle part of the flow equalizing plate 5 is provided with a plurality of water permeable holes 501, the arrangement range of the water permeable holes 501 is positioned above the inner cavity of the screen cylinder 3, so that the pulp is uniformly distributed, and simultaneously, the large particles in the pulp are preliminarily filtered, thereby avoiding that a large amount of edge cutting shredded paper strips containing laminated paper are used for packing waste and nylon bagged book waste paper during waste paper purchase, when the waste paper is used, after being disintegrated by a pulper, the plastic sheets of the laminated film and nylon woven bags can be mixed into the pulp by the sieve plate of the pulper, and can be intertwined with a small amount of staples and the like at a rough screening section to be clamped on the upper part of a rotor block 401, thereby influencing the normal operation of the equipment, and the flow equalizing plate 5 is positioned below a pulp inlet pipe 9, the bottom of the inner cavity of a pressure screen rotor 4, the positioning shaft 403 is fixedly sleeved with a helical blade 404, the bottom of the inner cavity of the screen cylinder 1 is provided with a slag guide box 6 positioned below the screen cylinder 3, one side of the slag guide box 6 is communicated with a slag discharge pipe 7, the bottom of the side of the slag guide box 6 communicated with the slag discharge pipe 7 is lower so as to discharge filtered coarse slag, slurry enters from a slurry inlet pipe 9 and flows into the screen cylinder 3 and the pressure screen rotor 4 through a water permeable hole 501 in the middle of a flow equalizing plate 5, the pressure screen rotor 4 rotates under the driving of a driving motor, under the rotation action of the rotor block 401, paper pulp positioned in the screen cylinder 3 is filtered through a filter screen on the side wall, fine paper pulp is discharged from a slurry discharge pipe 8 after permeation, the coarse slag falls into the slag guide box 6 and is discharged through the slag discharge pipe 7, when the pressure screen rotor 4 rotates, the opposite helical blade 404 rotates along with the pressure screen rotor 4, and the slurry falling into the pressure screen rotor 4 is under the action of the helical blade 404, throwing to the rotor wing block 401, when the pressure screen rotor 4 rotates, the slurry in the rotor wing block 401 is thrown out by the through groove 402, power is provided for the paper pulp thrown out in the rotor wing block 401, when the rotor wing block 401 rotates, the slurry acted in the screen cylinder 3 is impacted laterally, so that the slurry flowing through the filter screen in the screen cylinder 3 is not always in a rotational flow state with an angle, the screen cylinder 3 cannot be subjected to additional impact abrasion, the rotational flow paper pulp at the filter screen on the side surface of the screen cylinder 3 is well extruded in the process of filtering the slurry, the filter screen blockage is effectively avoided, the filtering efficiency of the slurry is influenced, meanwhile, the slurry is injected into the pressure screen rotor 4 under a certain pressure, the fallen slurry impacts the helical blades 404, certain power is provided for the rotation of the pressure screen rotor 4, and the vortex is prevented from being generated on the working surface of the rotor wing when the single pressure screen rotor 4 rotates, the vortex can be caused to jet out rapidly by the action of vortex and rotor wing working face and the interaction between the vortices, the jetted vortex can interact with the vortex inside the screen body and carries out momentum exchange, so that the instantaneous speed of the jetted vortex is increased, the momentum is increased, in the process, the provided power overcomes the resistance that the jetting of the vortex can increase the rotor wing, and the screening efficiency of the paper pulp is further improved.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a paper grade (stock) pressure screen, includes a sieve section of thick bamboo (1), pivot (2), screen cylinder (3), pressure screen rotor (4), arranges sediment pipe (7), arranges thick liquid pipe (8), advances thick liquid pipe (9), its characterized in that: the inner part of the pressure screen rotor (4) is communicated with the inner part of the screen cylinder (1), the side surface of the pressure screen rotor (4) is provided with a plurality of rotor blocks (401), the inner parts of the rotor blocks (401) are communicated with the inner part of the pressure screen rotor (4), the outer sides of the rotor blocks (401) are provided with through grooves (402), and the bottom of the inner cavity of the screen cylinder (1) is provided with a slag guide box (6) for receiving filter slag;

the inner chamber of a sieve section of thick bamboo (1) is equipped with flow equalizing plate (5) that are located screen cylinder (3) top, flow equalizing plate (5) are located the below of advancing thick liquid pipe (9), a plurality of holes (501) of permeating water have been seted up at the middle part of flow equalizing plate (5), and the scope of seting up of the hole (501) of just permeating water is located the inside of screen cylinder (3).

2. The press screen for papermaking according to claim 1, characterized in that: the bottom of the inner cavity of the pressure screen rotor (4) is fixedly connected with a positioning shaft (403), and the positioning shaft (403) is fixedly sleeved with a helical blade (404).

3. The press screen for papermaking according to claim 1, characterized in that: lead sediment case (6) and arrange sediment pipe (7) switch-on, and lead sediment case (6) and arrange the one side bottom of sediment pipe (7) switch-on lower, lead the inner chamber of sediment case (6) and screen drum (3) and communicate with each other.