Sizing and screening system of household paper making machine

Abstract

The utility model discloses a household paper papermaking machine sizing screening system which comprises a machine front groove, a vertical pipe, a pressure screen, a white water disc communicated with the vertical pipe, a vibrating screen and a head box, the machine front groove leads to the vertical pipe, the vertical pipe leads to an inlet of the pressure screen, and an outlet of the pressure screen respectively leads to the white water disc, the head box, an inlet of the vibrating screen and an outlet of the vibrating screen lead to the white water disc. Compared with the prior art, foreign matters and dry impurities are discharged by adopting the vibrating screen, so that the screen and the rotor wings are prevented from being damaged, the equipment is protected, and meanwhile, the paper machine is prevented from jumping due to the blockage of the screen; the screening system effectively saves water and electricity resources and improves the recovery rate of accepted pulp.

Description

Technical Field

[0001] The utility model relates to the technical field of papermaking, in particular to a sizing and screening system for a household papermaking machine. Background Art

[0002] Papermaking technology has become more and more advanced in our society. In the existing technology, papermaking process generally only processes raw materials into paper. After the paper is processed into finished products, it only has the original characteristics of ordinary paper. It is extremely difficult to remove impurities in the slurry during the processing, and the removal speed is slow, which cannot achieve the purpose of completely removing impurities. Therefore, a new slurry screening system is proposed. Utility Model Content

[0003] Purpose of the utility model: To solve the above-mentioned problems, the utility model provides a sizing and screening system for a household papermaking machine, which effectively saves water and electricity resources and improves the recovery rate of good pulp; foreign matter and dry impurities are discharged through a vibrating screen to avoid damage to the screen and rotor and protect the equipment, while avoiding clogging of the screen and causing the paper machine to trip.

[0004] Technical solution: To achieve the above-mentioned purpose, the sizing and screening system for a household papermaking machine described in the utility model includes a front trough, a vertical pipe, a pressure screen, a white water tray connected to the vertical pipe, a vibrating screen, and a head box. The front trough leads to the vertical pipe, the vertical pipe leads to the pressure screen inlet, the pressure screen outlet leads to the white water tray, the head box, and the vibrating screen inlet respectively, and the vibrating screen outlet leads to the white water tray.

[0005] Furthermore, the pressure screen is used to separate the pulp-water mixture into a first good pulp and a pulp-water mixture containing impurities.

[0006] Furthermore, the first good slurry is transported to a head box so that the slurry-water mixture containing impurities can be transported to a vibrating screen.

[0007] Furthermore, the vibrating screen is used to separate the pulp-water mixture containing impurities into second good pulp, second white water, and impurities.

[0008] Furthermore, the second good slurry and the second white water are transported to the white water tray, and impurities are discharged.

[0009] Furthermore, the vibrating screen and the pressure screen both lead to the ditch.

[0010] Furthermore, the original white water in the white water tray is the first white water.

[0011] Beneficial effects: Compared with the prior art, the utility model has the following significant effects: a vibrating screen is used to discharge foreign matter and dry impurities, thus avoiding damage to the screen and rotor and protecting the equipment, while avoiding screen blockage causing paper machine tripping; achieving the purpose of effectively saving water and electricity resources and greatly improving the recovery rate of good pulp. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure and process of the utility model. DETAILED DESCRIPTION

[0013] The utility model discloses a sizing and screening system for a household papermaking machine. Figure 1 As shown, the sizing and screening system for a papermaking machine for daily use provided by the utility model is further described in detail below: The sizing and screening system for a papermaking machine for daily use comprises a front trough 1, a sizing pump 3, a riser 4, a fan pump 6, a pressure screen 7, a white water tray 2 connected to the riser 4, a vibrating screen 8, and a head box 5. The sizing pump 3 leads from the front trough 1 to the riser 4, and the fan pump 6 leads from the riser 4 to the inlet of the pressure screen 7. The outlet of the pressure screen 7 leads to the white water tray 2, the head box 5, the inlet of the vibrating screen 8, and the ditch respectively, and the outlet of the vibrating screen 8 leads to the white water tray 2 and the ditch. The pulp in the front tank 1 of the machine is the first pulp, and the concentration of the first pulp is about 3.5%. The original white water in the white water tray 2 is the first white water, and the concentration of the first white water is about 0.085%. The upper pump 3 pumps the first pulp to the riser 4 to mix with the first white water to form the second pulp, and the concentration of the second pulp is diluted to 0.2% to 0.3%. Since the first white water contains some large impurities, these impurities will cause great damage to the equipment when entering the head box 5, so it is necessary to screen and remove the slag before entering the head box 5. First, a large water pressure is generated by the fan pump 6, and the second pulp passes through the pressure screen 7. This is the first screening step. The second pulp after the first screening step is divided into the first good pulp and the pulp-water mixture containing impurities. The pulp-water mixture containing impurities is the third pulp. The first good pulp is transported to the head box 5, and the third pulp is transported to the vibrating screen 8; secondly, the vibrating screen 8 is the second screening step. The third pulp after the second screening step is divided into the second good pulp, the second white water, and impurities. The second good pulp and the second white water are transported to the white water tray 2, and the impurities are discharged to the ditch 9. Before the system was adopted, 4 cubic meters of water were discharged per hour, the equipment operation rate was 95%, and 4×24×365×0.95=33288 cubic meters of water were discharged per year. When the good pulp concentration was 0.25%, 33288×0.0025=83.22 tons of good pulp were recovered each year, and the load power saving was reduced by 20%. Therefore, the system avoids the paper machine jumping caused by screen blockage, and impurities are discharged in time to avoid damage to the screen and rotor, thereby protecting the equipment; it changes the form of traditional pressure screen slag discharge, realizes the recycling of pulp water, and changes the intermittent slag discharge of traditional pressure screen into sustainable slag discharge, and changes the discharge of impurities and good pulp together from the traditional pressure screen into a complete separation of impurities and good pulp, making the slag discharge more thorough, and at the same time, good pulp is not wasted, which greatly saves the pulp water cost.

Claims

1. A sizing and screening system for a household papermaking machine, characterized in that: The invention comprises a front trough (1), a vertical pipe (4), a pressure screen (7), a white water tray (2) connected to the vertical pipe (4), a vibrating screen (8), and a head box (5); the front trough (1) leads to the vertical pipe (4), the vertical pipe (4) leads to the inlet of the pressure screen (7), the outlet of the pressure screen (7) leads to the white water tray (2), the head box (5), and the inlet of the vibrating screen (8), respectively, and the outlet of the vibrating screen (8) leads to the white water tray (2).

2. The sizing and screening system for a household papermaking machine according to claim 1, characterized in that: The pressure screen (7) is used to separate the pulp-water mixture into a first good pulp and a pulp-water mixture containing impurities.

3. The sizing and screening system for a household papermaking machine according to claim 2, characterized in that: The first acceptable stock is transported to a head box (5) so that the pulp-water mixture containing impurities is transported to a vibrating screen (8).

4. The sizing and screening system for a household papermaking machine according to claim 1, characterized in that: The vibrating screen (8) is used to separate the pulp-water mixture containing impurities into second good pulp, second white water and impurities.

5. The sizing and screening system for a household papermaking machine according to claim 4, characterized in that: The second good stock and the second white water are transported to the white water tray (2), and impurities are discharged.

6. The sizing and screening system for a household papermaking machine according to claim 1, characterized in that: The vibrating screen (8) and the pressure screen (7) both lead to the trench.

7. The sizing and screening system for a household papermaking machine according to claim 1, characterized in that: The original white water in the white water tray (2) is the first white water.

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