A pressure screen for removing impurities from pulp treated by centrifugal force

Abstract

The utility model discloses a paper pulp centrifugal force processing and impurity removing pressure screen, including jar body, the drive shaft of vertical installation at jar body bottom and set up in jar body inside and drive shaft link's rotor, jar body inside vertical fixedly has the primary screen cylinder of setting in the rotor outside and the secondary screen cylinder of setting in the primary screen cylinder outside, and the upper and lower end of secondary screen cylinder links fixedly with the inner wall top and inner wall bottom of jar body respectively, and the primary screen cylinder only upper end links with the inner wall top of jar body. The utility model discloses a two -stage screen cylinder structure with primary screen cylinder and secondary screen cylinder is arranged, so that the slurry realizes the grading screening effect from inside to outside, improves the good pulp quality, sets up the movable baffle of the hinge activity hinge of reset spring support in the primary screen cylinder inner wall, when the rotor drives the high -speed rotation of slurry, and the impurity in slurry hits movable baffle and has the resilience effect, reduces the adhesion on the primary screen cylinder in the separation and sinking process, reduces the impurity coverage rate on the primary screen cylinder, improves the filtration effect.

Description

Technical Field

[0001] This utility model relates to the field of impurity removal equipment technology, specifically a pressure screen for centrifugal impurity removal in pulp. Background Technology

[0002] In the papermaking industry, the centrifugal pressure screen for pulp purification mainly refers to the internal flow pressure screen, which is a key piece of equipment in the pulp purification process of modern papermaking. It adopts an internal pipeline design, which allows the pulp to pass through the screen under high pressure, quickly separating impurities such as sand and metal fragments, while reducing fiber damage.

[0003] An internal flow pressure screen is a device that continuously selects materials under pressure in a closed state. During operation, unscreened pulp under pressure is conveyed into the screen cylinder. With the help of the pressure difference between the inside and outside of the screen cylinder and the centrifugal action of the rotor, qualified pulp passes through the screen gaps to the outside of the screen cylinder and is led out by the good pulp pipe. Slag and impurities that cannot pass through the screen gaps settle down due to gravity and are discharged by the slag discharge pipe.

[0004] However, during use, impurities that cannot pass through the screen cylinder, besides those with high density that easily sink and are discharged, some impurities with low density do not easily sink and are more likely to adhere to the inner wall of the screen cylinder under the action of centrifugal force, which can easily lead to accumulation and blockage, affecting efficiency. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a pulp centrifugal pressure screen for impurity removal, which solves the problem that the single-layer screen cylinder of the existing internal flow pressure screen for pulp impurity removal is prone to clogging, affecting efficiency.

[0006] To solve the above-mentioned technical problems, this utility model provides the following technical solution: A pulp centrifugal treatment impurity removal pressure screen includes a tank, a drive shaft vertically installed at the bottom of the tank, and a rotor disposed inside the tank and connected to the drive shaft. A primary screen cylinder sleeved outside the rotor and a secondary screen cylinder sleeved outside the primary screen cylinder are vertically fixed inside the tank. The upper and lower ends of the secondary screen cylinder are fixedly connected to the top and bottom of the inner wall of the tank, respectively. Only the upper end of the primary screen cylinder is connected to the top of the inner wall of the tank. A slurry pipe is provided below the outside of the tank body, penetrating the tank body, the secondary screen cylinder, and the primary screen cylinder and extending into the interior of the primary screen cylinder. A slag discharge pipe is also provided below the outside of the tank body, penetrating the tank body and the secondary screen cylinder and extending below the lower edge of the primary screen cylinder into the interior of the primary screen cylinder. A good slurry pipe is provided above the outside of the tank body, penetrating the tank body and extending into the interior of the tank body. A vertical movable baffle is movably hinged to the inner wall of the primary screen cylinder. A movable groove is provided on the movable baffle. A movable limiting rod is movably engaged in the movable groove. The end of the movable limiting rod is movably hinged to a hinge seat fixed on the inner wall of the primary screen cylinder. A return spring is sleeved on the movable limiting rod and installed between the hinge seat and the movable baffle.

[0007] Preferably, there are multiple movable baffles and the angle between them and the inner wall of the primary screen cylinder is an acute angle. The multiple movable baffles are arranged in a ring array on the circumference of the inner wall of the primary screen cylinder.

[0008] Preferably, the movable baffle is hinged to the interior of the primary screen cylinder via a hinge. Each movable baffle is provided with multiple sets of hinges, movable limit rods, hinge seats and return springs, and the positions of the hinges, movable limit rods, hinge seats and return springs correspond to each other.

[0009] Preferably, the movable limiting rod is horizontally positioned, and the movable groove is a horizontal elongated groove adapted to the movable limiting rod.

[0010] Preferably, the movable limiting rod is a T-shaped rod and is movably engaged with the movable baffle through a movable groove.

[0011] Compared with the prior art, the present invention has the following beneficial effects: This invention utilizes a dual-stage screen structure with a primary screen and a secondary screen to achieve graded screening of pulp from the inside out, thereby improving the quality of good pulp. A movable baffle, supported by a return spring and hinged around a hinge, is installed on the inner wall of the primary screen. When the rotor drives the pulp to rotate at high speed, impurities in the pulp impact the movable baffle and rebound, reducing their adhesion to the primary screen during separation and settling. This lowers the impurity coverage on the primary screen, improves filtration efficiency, and solves the problem of easy clogging and reduced efficiency in existing single-layer internal flow pressure screens for pulp impurity removal. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the internal structure of the tank body of this utility model; Figure 3 This is a top view of a partial structure of the movable baffle of this utility model at the corresponding position; Figure 4 This is a partial front view of the corresponding position of the movable baffle of this utility model; Figure 5 This is a partial front view of the structure of the movable limit rod at the corresponding position of this utility model.

[0013] In the diagram: 1. Tank body; 2. Drive shaft; 3. Rotor; 4. Primary screen cylinder; 5. Secondary screen cylinder; 6. Slurry pipe; 7. Slag discharge pipe; 8. Good slurry pipe; 9. Movable baffle; 10. Movable trough; 11. Movable limit rod; 12. Hinge seat; 13. Return spring; 14. Hinge. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0015] like Figure 1-5 As shown, this utility model provides a technical solution: a pulp centrifugal treatment impurity removal pressure screen, including a tank 1, a drive shaft 2 vertically installed at the bottom of the tank 1, and a rotor 3 disposed inside the tank 1 and connected to the drive shaft 2. A primary screen cylinder 4 sleeved outside the rotor 3 and a secondary screen cylinder 5 sleeved outside the primary screen cylinder 4 are vertically fixed inside the tank 1. The upper and lower ends of the secondary screen cylinder 5 are fixedly connected to the top and bottom of the inner wall of the tank 1, respectively. Only the upper end of the primary screen cylinder 4 is connected to the top of the inner wall of the tank 1. A slurry pipe 6 is provided at the lower outside of the tank body 1, which penetrates the tank body 1, the secondary screen cylinder 5, and the primary screen cylinder 4 and extends into the interior of the primary screen cylinder 4. A slag discharge pipe 7 is also provided at the lower outside of the tank body 1, which penetrates the tank body 1 and the secondary screen cylinder 5 and extends into the interior of the primary screen cylinder 4 through the lower edge of the primary screen cylinder 4. A good slurry pipe 8 is provided at the upper outside of the tank body 1, which penetrates the tank body 1 and extends into the interior of the tank body 1. A vertical movable baffle 9 is movably hinged to the inner wall of the primary sieve cylinder 4. The movable baffle 9 is movably hinged to the interior of the primary sieve cylinder 4 through a hinge 14. There are multiple movable baffles 9 and the included angle between them and the inner wall of the primary sieve cylinder 4 is an acute angle. The multiple movable baffles 9 are arranged in a ring array on the circumference of the inner wall of the primary sieve cylinder 4. The movable baffle 9 is provided with a movable groove 10. The movable groove 10 is a horizontal elongated groove that is adapted to the movable limit rod 11. The movable limit rod 11 is movably engaged in the movable groove 10. The movable limit rod 11 is horizontally set and is a T-shaped rod that is movably engaged with the movable baffle 9 through the movable groove 10. The end of the movable limiting rod 11 is movably hinged to the hinge seat 12 fixed on the inner wall of the primary screen cylinder 4, and a return spring 13 located between the hinge seat 12 and the movable baffle 9 is sleeved on the movable limiting rod 11. Each movable baffle 9 is provided with multiple sets of hinges 14, movable limiting rods 11, hinge seats 12 and return springs 13, and the positions of the hinges 14, movable limiting rods 11, hinge seats 12 and return springs 13 correspond to each other.

[0016] Working principle: By setting up a two-stage screen structure with a primary screen cylinder 4 and a secondary screen cylinder 5, the slurry can be graded and screened from the inside out, improving the quality of the slurry. A movable baffle 9, supported by a return spring 13 and hinged around a hinge 14, is set on the inner wall of the primary screen cylinder 4. When the rotor 3 drives the slurry to rotate at high speed, the impurities in the slurry hit the movable baffle 9 and have a rebound effect. During the separation and settling process, the impurities are reduced to adhere to the primary screen cylinder 4, reducing the impurity coverage on the primary screen cylinder 4 and improving the filtration effect.

[0017] It should be noted that, in this document, terms such as “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0018] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pressure screen for centrifugal processing of pulp to remove impurities, comprising a tank (1), a drive shaft (2) vertically installed at the bottom of the tank (1), and a rotor (3) disposed inside the tank (1) and connected to the drive shaft (2), characterized in that: The tank (1) has a primary sieve cylinder (4) sleeved on the outside of the rotor (3) and a secondary sieve cylinder (5) sleeved on the outside of the primary sieve cylinder (4). The upper and lower ends of the secondary sieve cylinder (5) are fixedly connected to the top and bottom of the inner wall of the tank (1) respectively. The primary sieve cylinder (4) is only connected to the top of the inner wall of the tank (1) at its upper end. A slurry pipe (6) is provided below the outside of the tank body (1), penetrating the tank body (1), the secondary screen cylinder (5), and the primary screen cylinder (4) and extending into the interior of the primary screen cylinder (4). A slag discharge pipe (7) is also provided below the outside of the tank body (1), penetrating the tank body (1) and the secondary screen cylinder (5) and extending below the lower edge of the primary screen cylinder (4) into the interior of the primary screen cylinder (4). A good slurry pipe (8) is provided above the outside of the tank body (1), penetrating the tank body (1) and extending into the interior of the tank body (1). A vertical movable baffle (9) is movably hinged to the inner wall of the primary screen cylinder (4). A movable groove (10) is provided on the movable baffle (9). A movable limiting rod (11) is movably engaged in the movable groove (10). The end of the movable limiting rod (11) is movably hinged to a hinge seat (12) fixed on the inner wall of the primary screen cylinder (4). A return spring (13) is sleeved on the movable limiting rod (11) and installed between the hinge seat (12) and the movable baffle (9).

2. The pulp centrifugal treatment and impurity removal pressure screen according to claim 1, characterized in that: There are multiple movable baffles (9) and the angle between them and the inner wall of the primary sieve cylinder (4) is an acute angle. The multiple movable baffles (9) are arranged in a ring array on the circumference of the inner wall of the primary sieve cylinder (4).

3. The pulp centrifugal treatment and impurity removal pressure screen according to claim 1, characterized in that: The movable baffle (9) is hinged to the interior of the primary screen cylinder (4) via a hinge (14). Each movable baffle (9) is provided with multiple sets of hinges (14), movable limit rods (11), hinge seats (12) and return springs (13), and the positions of the hinges (14) correspond to those of the movable limit rods (11), hinge seats (12) and return springs (13).

4. The pulp centrifugal treatment impurity removal pressure screen according to claim 1, characterized in that: The movable limiting rod (11) is set horizontally, and the movable groove (10) is a horizontal elongated groove that is adapted to the movable limiting rod (11).

5. The pulp centrifugal treatment and impurity removal pressure screen according to claim 1, characterized in that: The movable limiting rod (11) is a T-shaped rod and is movably engaged with the movable baffle (9) through the movable groove (10).

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