Paper pulp pressure screen for papermaking

Abstract

The utility model relates to the technical field of paper pulp pressurized screens, in particular to a paper pulp pressurized screen for papermaking, which comprises a barrel with a rotor and a screen inside, and a pulp inlet pipe, a dilution water pipe and a controller are arranged on the barrel. A first pressure gauge used for detecting the internal pressure of the screen and a second pressure gauge used for detecting the position between the screen and the inner side wall of the barrel are further arranged on the barrel, a first valve used for controlling the flow of the pulp inlet pipe is arranged on the pulp inlet pipe, and a second valve used for controlling the flow of the dilution water pipe is arranged on the dilution water pipe; the input end of the controller is connected with the first pressure sensor and the second pressure sensor and used for receiving pressure signals obtained by the first pressure sensor and the second pressure sensor, the output end of the controller outputs control signals, and the control signals are used for controlling the flow of the first valve and the flow of the second valve. The problem that in the screening process of a paper pulp pressurized screen in the prior art, a screen is prone to being blocked, and consequently the screening effect is poor is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of pulp pressure screens, in particular to a pulp pressure screen for papermaking. Background Art

[0002] The pulp pressure screen is used to remove impurities in the pulp. Its main principle is that the driving part drives the rotor inside the cylinder to rotate. The rotor is provided with a rotor. When the rotor rotates, it drives the fibers in the pulp to pass through the screen and be discharged from the pulp outlet pipe. Large impurities cannot pass through the screen and are discharged from the slag discharge pipe, thereby realizing the separation of impurities in the pulp. The problem with the prior art is that the existing pulp pressure screen is often blocked when working, resulting in an increase in the pressure difference on both sides of the screen. At this time, the efficiency of removing impurities is low. The main reasons for this situation are, first, the concentration of the incoming pulp is too high, and a large amount of fiber molecules accumulate, causing the screen to be blocked. Second, large particles of impurities in the pulp block the filter, resulting in poor filtering effect of the screen. Based on the above situation, it is necessary to design a pulp pressure screen for papermaking to solve the above problems. Utility Model Content

[0003] The utility model provides a pulp pressure screen for papermaking, so as to solve the problem in the prior art that the screen mesh of the pulp pressure screen is easily blocked during the screening process, resulting in poor screening effect.

[0004] The technical problem solved by the utility model is achieved by the following technical solutions:

[0005] A pulp pressure screen for papermaking comprises a cylinder with a rotor and a screen inside, the cylinder is provided with a pulp inlet pipe, a dilution water pipe and a controller, the cylinder is also provided with a first pressure gauge for detecting the internal pressure of the screen and a second pressure gauge for detecting the pressure between the screen and the inner wall of the cylinder, the pulp inlet pipe is provided with a first valve for controlling the flow of the pulp inlet pipe, the dilution water pipe is provided with a second valve for controlling the flow of the dilution water pipe, the input end of the controller is connected to a first pressure sensor and a second pressure sensor for receiving pressure signals obtained by the first pressure sensor and the second pressure sensor, and the output end of the controller outputs a control signal, and the control signal is used to control the flow size of the first valve and the second valve.

[0006] Preferably, a driving member for driving the rotor to rotate is provided on one side of the cylinder, a rotor is fixedly connected to the rotor, the outer side of the rotor has a first arc segment with the same curvature as the screen, and the two sides of the first arc segment respectively have a second arc segment and a third arc segment with a curvature greater than the first arc segment.

[0007] Preferably, the screen is in the shape of a truncated cone with a radius gradually decreasing from bottom to top, and the top edge and the lower edge of the screen are connected to the inner wall of the cylinder through a sealing plate, and the sealing plate, the screen and the inner wall of the cylinder together form a pulp discharge chamber.

[0008] Preferably, the driving member drives the rotor to rotate via a belt.

[0009] Preferably, a slurry discharge pipe is provided on the side wall of the cylinder and is connected to the slurry discharge chamber.

[0010] Preferably, a slag discharge pipe is also provided at the bottom of the cylinder.

[0011] The beneficial effect of the utility model is as follows: by setting the first pressure gauge, the second pressure gauge, the first valve, the second valve and the controller, the controller can receive the pressure values ​​of the first pressure gauge and the second pressure gauge. When the pressure difference between the first pressure gauge and the second pressure gauge is large, the flow rate of the first valve is controlled to be smaller, and the flow rate of the second valve is controlled to be larger, thereby diluting the pulp, reducing the concentration of the pulp, and reducing the clogging of the screen. By setting the screen into a frustum shape and cooperating with the rotor, the situation of large particles of impurities adhering to the screen can be reduced, further avoiding the clogging of the screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the implementation scheme of the utility model or the technical scheme in the prior art, the drawings required for use in the implementation scheme or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some implementation schemes of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0013] Figure 1 This is a schematic diagram of the structure of the utility model:

[0014] Figure 2 This is the front view of the utility model:

[0015] Figure 3 This is a longitudinal sectional view of the utility model:

[0016] Figure 4 It is a transverse cross-sectional view of the utility model;

[0017] Figure 5 This is a schematic diagram of the circuit principle of the controller of the utility model for adjusting the slurry concentration.

[0018] In the figure, 1, cylinder; 2, slurry inlet pipe; 3, dilution water pipe; 4, first valve; 5, second valve; 6, controller; 7, rotor; 8, driving member; 9, rotor; 901, first arc segment; 902, second arc segment; 903, third arc segment; 10, slurry outlet pipe; 11, slag discharge pipe; 12, first pressure gauge; 13, second pressure gauge; 14, screen; 15, sealing plate; 16, slurry outlet chamber; 17, belt. DETAILED DESCRIPTION

[0019] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below with reference to specific illustrations.

[0020] Reference Figure 1-Figure 5 As shown, a pulp pressure screen for papermaking comprises a cylinder 1 with a rotor 7 and a screen 14 inside, the cylinder 1 is provided with a pulp inlet pipe 2, a dilution water pipe 3 and a controller 6, the cylinder 1 is also provided with a first pressure gauge 12 for detecting the internal pressure of the screen 14 and a second pressure gauge 13 for detecting the pressure between the screen 14 and the inner wall of the cylinder 1, the pulp inlet pipe 2 is provided with a first valve 4 for controlling the flow of the pulp inlet pipe 2, the dilution water pipe 3 is provided with a second valve 5 for controlling the flow of the dilution water pipe 3, the input end of the controller 6 is connected with the first pressure sensor and the second pressure sensor for receiving the pressure signals obtained by the first pressure sensor and the second pressure sensor, the output end of the controller 6 outputs a control signal, and the control signal is used to control the flow size of the first valve 4 and the second valve 5.

[0021] Specifically, when the existing pulp pressure screen removes impurities from the pulp, the screening efficiency is often poor because the screen 14 is blocked by fiber molecules or large particles. When the screen 14 is blocked, the pressure difference on both sides of the screen 14 is large. Therefore, the utility model can detect the pressure inside the screen 14 and the pressure between the screen 14 and the cylinder 1 through the first pressure gauge 12 and the second pressure gauge 13, such as Figure 1 and Figure 5As shown, the output ends of the first pressure gauge 12 and the second pressure gauge 13 are connected to the input end of the controller 6 to provide a pressure signal to the controller 6. The first valve 4 and the second valve 5 are arranged on the pulp inlet pipe 2 and the dilution water pipe 3. When the controller 6 determines that the pressure difference on both sides of the screen 14 is large, the pressure difference on both sides of the screen 14 is reduced by adjusting the flow of the first valve 4 and the second valve 5. That is, if the pressure difference on both sides of the screen 14 is large, the flow of the first valve 4 is controlled to be reduced, and the flow of the second valve 5 is controlled to be increased, so that the concentration of the pulp is diluted and the flow of the pulp is reduced. The situation that the screen 14 is blocked by the accumulated fiber molecules is reduced, and the pressure difference on both sides of the screen 14 is ensured to be within a reasonable range, thereby realizing the adjustment of the pressure difference on both sides of the screen 14 and reducing the blockage of the screen 14.

[0022] Furthermore, a driving member 8 for driving the rotor 7 to rotate is provided on one side of the cylinder 1, and a rotor 9 is fixedly connected to the rotor 7. The outer side of the rotor 9 has a first arc segment 901 with the same arc as the screen 14, and the two sides of the first arc segment 901 respectively have a second arc segment 902 and a third arc segment 903 with an arc greater than the first arc segment 901.

[0023] It can be seen that in order to avoid fiber molecules and large particles blocking the filter, Figure 3 and Figure 4 As described above, during the rotation of the rotor 9, the direction is from the third arc segment 903 to the direction of the first arc segment 901. The fiber molecules and large particle impurities are driven to the screen 14 by the positive pressure of the second arc segment 902 and the screen 14. The reason for the positive pressure is mainly that the second arc segment 902 is affected by its own shape, and the gap between it and the screen 14 gradually decreases, causing the pressure to gradually increase. Under the drive of the positive pressure, some scattered fiber molecules pass through the screen 14, while the large particle impurities and accumulated fiber molecules are blocked by the screen 14 due to their large size and attached to the screen 14. As the rotor 9 The first arc segment 901 rotates, and the curvature is the same as that of the screen 14, so that the pressure between the first arc segment 901 and the screen 14 is in a balanced state. The third arc segment 903 is affected by its own shape, and the gap between it and the screen 14 is in a gradually increasing state during the rotation process, thereby generating a negative pressure, so that the accumulated fiber molecules and large particles of impurities attached to the screen 14 are separated from the screen 14, and the accumulated fiber molecules are broken up by the action of the dilution water, and will gradually pass through the filter under the action of the rotor 9 next time, and the large particles of impurities will be discharged from the slag discharge pipe 11 below due to their own gravity.

[0024] Further, such as Figure 3As shown, the screen 14 is in the shape of a truncated cone with a radius gradually decreasing from bottom to top. The top edge and the lower edge of the screen 14 are connected to the inner wall of the cylinder 1 through a sealing plate 15. The sealing plate 15, the screen 14 and the inner wall of the cylinder 1 together form a pulp discharge chamber 16.

[0025] Specifically, in order to make it easier for the accumulated fiber molecules and large particle impurities to detach from the inner wall of the screen 14, the screen 14 is configured to be a frustum, and the large particle impurities and accumulated fiber molecules are more easily detached from the screen 14 due to gravity.

[0026] Furthermore, the driving member 8 drives the rotor 7 to rotate via a belt.

[0027] Among them, Figure 1 , Figure 2 and Figure 3 As shown, the driving member 8 may be a motor, which drives the rotor 7 to rotate via a belt.

[0028] Furthermore, a slurry discharge pipe 10 is provided on the side wall of the cylinder 1 and is connected to the slurry discharge chamber 16 .

[0029] Among them, Figure 3 As shown, a pulp discharge pipe 10 is provided on the side wall of the cylinder 1 , and the pulp discharge pipe 10 is used to discharge the good pulp in the pulp discharge chamber 16 .

[0030] Further, such as Figure 3 As shown, a slag discharge pipe 11 is also provided at the bottom of the cylinder 1.

[0031] A slag discharge pipe 11 is provided at the bottom of the cylinder 1 to remove heavy impurities inside the cylinder 1 .

[0032] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A pulp pressure screen for papermaking, comprising a cylinder (1) having a rotor (7) and a screen (14) inside, wherein a pulp inlet pipe (2), a dilution water pipe (3) and a controller (6) are arranged on the cylinder (1), characterized in that: The cylinder (1) is also provided with a first pressure gauge (12) for detecting the internal pressure of the screen (14) and a second pressure gauge (13) for detecting the pressure between the screen (14) and the inner wall of the cylinder (1); the slurry inlet pipe (2) is provided with a first valve (4) for controlling the flow rate of the slurry inlet pipe (2); the dilution water pipe (3) is provided with a second valve (5) for controlling the flow rate of the dilution water pipe (3); the input end of the controller (6) is connected to the first pressure sensor and the second pressure sensor for receiving pressure signals obtained by the first pressure sensor and the second pressure sensor; the output end of the controller (6) outputs a control signal, and the control signal is used to control the flow rate of the first valve (4) and the second valve (5).

2. A papermaking pulp pressure screen according to claim 1, characterized in that: A driving member (8) for driving the rotor (7) to rotate is provided on one side of the cylinder (1); a rotor (9) is fixedly connected to the rotor (7); the outer side of the rotor (9) has a first arc segment (901) having the same arc as the screen (14); and the two sides of the first arc segment (901) respectively have a second arc segment (902) and a third arc segment (903) having an arc greater than the first arc segment (901).

3. A papermaking pulp pressure screen according to claim 1, characterized in that: The screen (14) is in the shape of a truncated cone with a radius that gradually decreases from bottom to top. The top edge and the bottom edge of the screen (14) are connected to the inner wall of the cylinder (1) via a sealing plate (15). The sealing plate (15), the screen (14) and the inner wall of the cylinder (1) together form a pulp discharge chamber (16).

4. A papermaking pulp pressure screen according to claim 2, characterized in that: The driving member (8) drives the rotor (7) to rotate via a belt.

5. A papermaking pulp pressure screen according to claim 3, characterized in that: A pulp discharge pipe (10) is provided on the side wall of the cylinder (1) and is in communication with the pulp discharge chamber (16).

6. A papermaking pulp pressure screen according to claim 1, characterized in that: A slag discharge pipe (11) is also provided at the bottom of the cylinder (1).

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