CN211689659U

CN211689659U - Classifying screen for papermaking

Info

Publication number: CN211689659U
Application number: CN201921465409.5U
Authority: CN
Inventors: 李时民
Original assignee: Xuancheng Wanli Paper Co ltd
Current assignee: Xuancheng Wanli Paper Co ltd
Priority date: 2019-09-04
Filing date: 2019-09-04
Publication date: 2020-10-16
Anticipated expiration: 2029-09-04

Abstract

The utility model relates to a classifying screen for papermaking, include: the device comprises a first screening mechanism, a second screening mechanism positioned below the first screening mechanism, and water tanks respectively communicated with the first screening mechanism and the second screening mechanism; the first screening mechanism includes: the filter screen comprises a first box body, a fixed seat arranged in the first box body and a first filter screen arranged at the top of the fixed seat; the bottom of the box body is provided with a first slag discharge port, and the side wall of the box body is provided with a first slurry outlet; a vertical plate is arranged at the top of the fixed seat, a first stirring area is arranged inside the vertical plate and the inner side wall of the fixed seat, and a first drainage area is arranged between the vertical plate and the first filter screen; the second screening mechanism includes: the second box body and a second filter screen arranged in the second box body; the water tank is communicated with a mixing tank, and the mixing tank is communicated with the first slurry outlet through a pipeline; the mixing box is communicated with the second box body through a pipeline.

Description

Classifying screen for papermaking

Technical Field

The utility model relates to a papermaking technical field specifically is a classifying screen for papermaking.

Background

The paper making raw material is generally wood, plant fiber and the like, a chemical reagent is added in the pulping process to destroy the original wood structure, the needed wood fiber is decomposed, and the pulp is extracted and dried after pulping to form the needed paper. During pulping, due to the reasons that wood is not completely decomposed, other impurities are mixed in the process and the like, the pulp after pulping is not all the required good pulp, and waste pulp and other impurities are in the pulp, and the parts of the poor pulp need to be screened out.

In the existing screening system, the slurry inlet concentration can influence the screening effect. The multi-stage screening device capable of controlling the pulp inlet concentration is provided.

SUMMERY OF THE UTILITY MODEL

The utility model discloses just to prior art exist not enough, provide a paper grade (stock) classifying screen.

In order to solve the above problems, the utility model adopts the following technical proposal:

a sizing screen for papermaking comprising: the device comprises a first screening mechanism, a second screening mechanism positioned below the first screening mechanism, and water tanks respectively communicated with the first screening mechanism and the second screening mechanism; the first screening mechanism includes: the filter screen comprises a first box body, a fixed seat arranged in the first box body and a first filter screen arranged at the top of the fixed seat; the bottom of the first box body is provided with a first slag discharge port, and the side wall of the first box body is provided with a first slurry outlet; a vertical plate is arranged at the top of the fixed seat, a first stirring area is arranged inside the vertical plate and the inner side wall of the fixed seat, and a first drainage area is arranged between the vertical plate and the first filter screen; the second screening mechanism includes: the second box body and a second filter screen arranged in the second box body; the water tank is communicated with a mixing tank, and the mixing tank is communicated with the first slurry outlet through a pipeline; the mixing box is communicated with the second box body through a pipeline.

As an improvement of the above technical scheme, a second slurry inlet and a second slurry outlet are arranged on the side wall of the second box body, and the second slurry inlet and the second slurry outlet are oppositely arranged; and the second pulp inlet and the second pulp outlet are both positioned above the second filter screen.

As an improvement of the technical scheme, a second liquid discharge area is arranged above the second filter screen, and a second stirring area is arranged below the second filter screen; and a second slag discharge port is formed at the bottom of the second box body.

As an improvement of the technical scheme, the water tank is communicated with a fourth pipeline, the side wall of the second tank body is communicated with a fifth pipeline, and the fourth pipeline is communicated with the fifth pipeline.

As an improvement of the above technical solution, the diameter of the fifth pipeline is smaller than that of the fourth pipeline; the interface of fifth pipeline and second box is located the below of second filter screen, and the setting of second filter screen is pressed close to the fifth pipeline.

As an improvement of the technical scheme, the first box body and the second box body are both in a cylindrical shell shape; the first filter screen is cylindrical and is fixed on the inner side wall of the first box body; impellers are arranged at the bottoms of the first stirring area and the second stirring area.

As an improvement of the technical scheme, a box cover is arranged at the top of the first box body, and a first slurry inlet is formed in the box cover; the slurry inlet is internally connected with a slurry inlet pipe, and the lower pipe opening of the slurry inlet pipe is positioned in the first stirring area.

As an improvement of the technical scheme, a support frame is arranged at the bottom of the first box body, and the first slag discharge port is connected with a slag discharge channel.

Compared with the prior art, the utility model discloses an implement the effect as follows:

the utility model discloses a set up first box and second box and carry out the second grade to the magma and divide the sieve, carry out preliminary centrifugation to the magma through setting up first stirring district and first drainage district and sieve, promote the good thick liquid quality that gets into the second box through setting up first filter screen, through setting up the good thick liquid concentration that the second grade was divided in the mixing box control, through setting up the good thick liquid of second filter screen further separation and filter residue, through setting up the good thick liquid of fourth pipe dilution second box in and in time clear up the second filter screen. This device is through setting up the second grade and filtering and improving the structure and advance thick liquid play thick liquid position, will stir and two processes of flowing back divide the region to go on, when controlling good thick liquid concentration, has promoted the efficiency of branch sieve effectively.

Drawings

FIG. 1 is a front view of a sizing screen according to the present invention;

FIG. 2 is a top view of the sizing screen of the present invention;

fig. 3 is a structural view of the first slag discharge port.

In the figure: 1-a first screening mechanism, 11-a first box, 111-a first slag discharge port, 112-a first slurry outlet, 12-a fixed seat, 121-a vertical plate, 122-a first stirring area, 123-a first discharge area, 13-a box cover, 14-a first filter screen, 15-a first slurry inlet, 151-a slurry inlet pipe, 2-a second screening mechanism, 21-a second box, 211-a second slurry inlet, 212-a second slurry outlet, 213-a second slag discharge port, 22-a second filter screen, 23-a first discharge area, 24-a second stirring area, 3-a water tank, 31-a mixing box, 311-a first pipeline, 312-a second pipeline, 312-a third pipeline, 32-a fourth pipeline, 321-a fifth pipeline, 4-a fixed structure, 41-a base, 42-a support frame, 43-a motor, 44-an impeller, 45-a channel.

Detailed Description

The present invention will be described with reference to specific embodiments.

Fig. 1 is the front view of the classifying screen of the present invention, as shown in fig. 1, the classifying screen of the present invention comprises: the screening device comprises a first screening mechanism 1, a second screening mechanism 2 located below the first screening mechanism 1, and a water tank 3 communicated with the first screening mechanism 1 and the second screening mechanism 2 respectively.

The first screening mechanism 1 includes: the filter screen device comprises a first box body 11, a fixed seat 12 arranged inside the first box body 11, and a first filter screen 14 arranged on the top of the fixed seat 12. The bottom of the first box body 11 is provided with a first slag discharge port 111, and the side wall of the first box body is provided with a first slurry outlet port 112. A vertical plate 121 is arranged at the top of the fixing seat 12, a first stirring area 122 is arranged inside the vertical plate 121 and the inner side wall of the fixing seat 12, and a first drainage area 123 is arranged between the vertical plate 121 and the first filter screen 14. The second screening mechanism 2 includes: a second box 21, and a second filter 22 installed inside the second box 21.

The water tank 3 is communicated with a mixing tank 31, and the mixing tank 31 is communicated with the first slurry outlet 112 through a pipeline. The mixing tank 31 communicates with the second tank 21 through a pipe.

The puree enters the first agitation zone 122 to participate in the agitation and centrifugation. The good pulp is divided into upper part, and the good pulp will enter the first drainage area 123 when it crosses the vertical plate 121, and then enter the mixing box 31 after being simply filtered by the first filter screen 14. While the heavier impurities are separated out of the bottom first slag discharge 111. This is the first stage of screening. In the process, a stirring centrifugal mode is utilized to separate out larger impurities, and then a filter screen is arranged on the side wall for filtering, so that good pulp with better quality is obtained.

The accept from the first screening is mixed with water from the water tank 3 after entering the mixing tank 31, the accept is diluted, the accept concentration after the first screening is controlled, and the diluted accept is discharged into the second box 12 to be screened for the second time. Most impurity can be screened to the mode that the one-level was sieved, but can indirectly improve the good thick liquid concentration after the screening, and good thick liquid loss rate promotes when leading to the second grade screening, consequently sets up mixing box 31 and water tank 3 and dilutes, ensures the screening efficiency of good thick liquid, reduces the loss.

The side wall of the second box body 21 is provided with a second slurry inlet 211 and a second slurry outlet 212, and the second slurry inlet 211 and the second slurry outlet 212 are arranged oppositely. And the second slurry inlet 211 and the second slurry outlet 212 are both located above the second screen 22. A second liquid discharge area 23 is arranged above the second filter screen 22, and a second stirring area 24 is arranged below the second filter screen 22. The bottom of the second box 21 is provided with a second slag discharge opening 213.

The position of advancing thick liquid and play thick liquid like this sets up, makes the thick liquid pass through maximum screening, and inside the thick liquid got into second box 21 from second thick liquid mouth 211, the below that gets into second filter screen 22 through the simple filtration of second filter screen 22 participated in the stirring. After the stirring and centrifugation, the good pulp is located above and gradually flows through the second filter screen 22, and leaves the second box 21 from the second pulp outlet 212.

A fourth pipeline 32 is communicated with the water tank 3, a fifth pipeline 321 is communicated with the side wall of the second tank body 21, and the fourth pipeline 32 is communicated with the fifth pipeline 321. The fourth pipe 32 is used to send water into the second box 21 to form a constantly diluted environment to promote the centrifugation and separation of the accept.

The diameter of the fifth pipe 321 is smaller than the diameter of the fourth pipe 32. The interface between the fifth pipe 321 and the second box 21 is located below the second filter screen 22, and the fifth pipe 321 is disposed adjacent to the second filter screen 22. The pressure difference is formed by the change of the pipe diameter, and the flow velocity of the water sprayed out is improved. The concentration of the water on the second screen 22 is continuously diluted to avoid the blocking.

Fig. 2 is a top view of the classifying screen of the present invention, and as shown in fig. 2, the first box 11 and the second box 21 are both cylindrical shell-shaped. The first filter 14 is cylindrical and fixed on the inner sidewall of the first box 11. The bottom of the first stirring section 122 and the second stirring section 24 are both provided with impellers 44. The cylindrical structure is arranged to utilize the advantages of the cylindrical arc edge, and the phenomenon that the side edge causes blocking liquid and the like is avoided.

A box cover 13 is installed at the top of the first box body 11, and a first slurry inlet 15 is formed in the box cover 13. A slurry inlet pipe 151 is connected in the slurry inlet 15, and a lower pipe opening of the slurry inlet pipe 151 is positioned in the first stirring area 122. The cover 13 may be dust tight and so positioned to ensure that the slurry enters the first mixing section 122.

Fig. 3 is a structural diagram of the first slag discharging port, and as shown in fig. 3, a supporting frame 42 is arranged at the bottom of the first tank 11, and the first slag discharging port 111 is connected with a slag discharging channel 45. The arrangement avoids material blockage when the first slag discharge port 111 above discharges slag.

It will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. A sizing screen for papermaking, comprising: the device comprises a first screening mechanism (1), a second screening mechanism (2) positioned below the first screening mechanism (1), and a water tank (3) respectively communicated with the first screening mechanism (1) and the second screening mechanism (2);

the first screening mechanism (1) comprises: the filter screen comprises a first box body (11), a fixed seat (12) arranged in the first box body (11), and a first filter screen (14) arranged at the top of the fixed seat (12); the bottom of the first box body (11) is provided with a first slag discharge port (111), and the side wall of the first box body is provided with a first slurry outlet (112); a vertical plate (121) is arranged at the top of the fixed seat (12), a first stirring area (122) is arranged inside the vertical plate (121) and the inner side wall of the fixed seat (12), and a first drainage area (123) is arranged between the vertical plate (121) and the first filter screen (14);

the second screening mechanism (2) comprises: the second box body (21) and a second filter screen (22) arranged in the second box body (21); the water tank (3) is communicated with a mixing tank (31), and the mixing tank (31) is communicated with the first slurry outlet (112) through a pipeline; the mixing box (31) is communicated with the second box body (21) through a pipeline.

2. The classifying screen for papermaking according to claim 1, wherein a second pulp inlet (211) and a second pulp outlet (212) are provided on the side wall of the second box body (21), the second pulp inlet (211) and the second pulp outlet (212) are oppositely arranged; the second slurry inlet (211) and the second slurry outlet (212) are both positioned above the second filter screen (22).

3. A sizing screen for papermaking according to claim 2, characterised in that a second drainage area (23) is provided above the second screen (22) and a second agitation area (24) is provided below the second screen (22); and a second slag discharge port (213) is formed at the bottom of the second box body (21).

4. The classifying screen for papermaking as claimed in claim 1, wherein a fourth pipeline (32) is connected to the water tank (3), a fifth pipeline (321) is connected to the side wall of the second box body (21), and the fourth pipeline (32) is connected to the fifth pipeline (321).

5. A sizing screen for paper making according to claim 4, characterised in that the diameter of the fifth pipe (321) is smaller than the diameter of the fourth pipe (32); the interface of the fifth pipeline (321) and the second box body (21) is positioned below the second filter screen (22), and the fifth pipeline (321) is arranged close to the second filter screen (22).

6. A sizing screen for paper manufacture according to claim 3, characterised in that the first box (11) and the second box (21) are both cylindrical shell shaped; the first filter screen (14) is cylindrical and is fixed on the inner side wall of the first box body (11); impellers (44) are arranged at the bottoms of the first stirring area (122) and the second stirring area (24).

7. The classifying screen for papermaking according to claim 1, characterized in that a box cover (13) is installed on the top of the first box body (11), and a first pulp inlet (15) is arranged on the box cover (13); the slurry inlet (15) is internally connected with a slurry inlet pipe (151), and a lower pipe opening of the slurry inlet pipe (151) is positioned in the first stirring area (122).

8. The classifying screen for papermaking according to claim 1, wherein a support frame (42) is arranged at the bottom of the first box body (11), and a slag discharge channel (45) is connected to the first slag discharge port (111).